From d46055e868b7e687f50866f8aa1cefc177836bc7 Mon Sep 17 00:00:00 2001 From: Klement Sekera Date: Mon, 24 Jun 2019 11:52:49 +0000 Subject: ip: refactor reassembly this is a preparation step for introducing other reassembly types Type: refactor Change-Id: I197e299dbd729b00eead31667913b8ceff915d63 Signed-off-by: Klement Sekera (cherry picked from commit 896c896a3c4ed563a270281ff8b50fd253f4833f) --- src/vnet/CMakeLists.txt | 8 +- src/vnet/ip/ip46_cli.c | 16 +- src/vnet/ip/ip4_forward.c | 2 +- src/vnet/ip/ip4_input.c | 2 +- src/vnet/ip/ip4_reassembly.c | 1799 ----------------------------------- src/vnet/ip/ip4_reassembly.h | 54 -- src/vnet/ip/ip6_forward.c | 2 +- src/vnet/ip/ip6_reassembly.c | 1795 ----------------------------------- src/vnet/ip/ip6_reassembly.h | 53 -- src/vnet/ip/ip_api.c | 44 +- src/vnet/ip/reass/ip4_full_reass.c | 1818 ++++++++++++++++++++++++++++++++++++ src/vnet/ip/reass/ip4_full_reass.h | 54 ++ src/vnet/ip/reass/ip6_full_reass.c | 1812 +++++++++++++++++++++++++++++++++++ src/vnet/ip/reass/ip6_full_reass.h | 54 ++ 14 files changed, 3778 insertions(+), 3735 deletions(-) delete mode 100644 src/vnet/ip/ip4_reassembly.c delete mode 100644 src/vnet/ip/ip4_reassembly.h delete mode 100644 src/vnet/ip/ip6_reassembly.c delete mode 100644 src/vnet/ip/ip6_reassembly.h create mode 100644 src/vnet/ip/reass/ip4_full_reass.c create mode 100644 src/vnet/ip/reass/ip4_full_reass.h create mode 100644 src/vnet/ip/reass/ip6_full_reass.c create mode 100644 src/vnet/ip/reass/ip6_full_reass.h (limited to 'src') diff --git a/src/vnet/CMakeLists.txt b/src/vnet/CMakeLists.txt index 1e51f3d7102..aaa16d8389b 100644 --- a/src/vnet/CMakeLists.txt +++ b/src/vnet/CMakeLists.txt @@ -431,7 +431,7 @@ list(APPEND VNET_SOURCES ip/ip4_pg.c ip/ip4_source_and_port_range_check.c ip/ip4_source_check.c - ip/ip4_reassembly.c + ip/reass/ip4_full_reass.c ip/ip6_format.c ip/ip6_forward.c ip/ip6_ll_table.c @@ -441,7 +441,7 @@ list(APPEND VNET_SOURCES ip/ip6_input.c ip/ip6_neighbor.c ip/ip6_pg.c - ip/ip6_reassembly.c + ip/reass/ip6_full_reass.c ip/rd_cp.c ip/ip_neighbor.c ip/ip_api.c @@ -461,9 +461,9 @@ list(APPEND VNET_SOURCES list(APPEND VNET_MULTIARCH_SOURCES ip/ip4_source_check.c ip/ip4_punt_drop.c - ip/ip4_reassembly.c + ip/reass/ip4_full_reass.c ip/ip6_hop_by_hop.c - ip/ip6_reassembly.c + ip/reass/ip6_full_reass.c ip/ip6_input.c ip/ip6_punt_drop.c ip/punt_node.c diff --git a/src/vnet/ip/ip46_cli.c b/src/vnet/ip/ip46_cli.c index e0e26a2ce5d..ee797ab7068 100644 --- a/src/vnet/ip/ip46_cli.c +++ b/src/vnet/ip/ip46_cli.c @@ -38,8 +38,8 @@ */ #include -#include -#include +#include +#include /** * @file @@ -269,26 +269,26 @@ set_reassembly_command_fn (vlib_main_t * vm, } - vnet_api_error_t rv4 = ip4_reass_enable_disable (sw_if_index, ip4_on); - vnet_api_error_t rv6 = ip6_reass_enable_disable (sw_if_index, ip6_on); + vnet_api_error_t rv4 = ip4_full_reass_enable_disable (sw_if_index, ip4_on); + vnet_api_error_t rv6 = ip6_full_reass_enable_disable (sw_if_index, ip6_on); if (rv4 && rv6) { return clib_error_return (0, - "`ip4_reass_enable_disable' API call failed, rv=%d:%U, " - "`ip6_reass_enable_disable' API call failed, rv=%d:%U", + "`ip4_full_reass_enable_disable' API call failed, rv=%d:%U, " + "`ip6_full_reass_enable_disable' API call failed, rv=%d:%U", (int) rv4, format_vnet_api_errno, rv4, (int) rv6, format_vnet_api_errno, rv6); } else if (rv4) { return clib_error_return (0, - "`ip4_reass_enable_disable' API call failed, rv=%d:%U", + "`ip4_full_reass_enable_disable' API call failed, rv=%d:%U", (int) rv4, format_vnet_api_errno, rv4); } else if (rv6) { return clib_error_return (0, - "`ip6_reass_enable_disable' API call failed, rv=%d:%U", + "`ip6_full_reass_enable_disable' API call failed, rv=%d:%U", (int) rv6, format_vnet_api_errno, rv6); } return NULL; diff --git a/src/vnet/ip/ip4_forward.c b/src/vnet/ip/ip4_forward.c index ecb35955798..2cf84f3114c 100644 --- a/src/vnet/ip/ip4_forward.c +++ b/src/vnet/ip/ip4_forward.c @@ -1869,7 +1869,7 @@ VLIB_REGISTER_NODE (ip4_local_node) = [IP_LOCAL_NEXT_PUNT] = "ip4-punt", [IP_LOCAL_NEXT_UDP_LOOKUP] = "ip4-udp-lookup", [IP_LOCAL_NEXT_ICMP] = "ip4-icmp-input", - [IP_LOCAL_NEXT_REASSEMBLY] = "ip4-reassembly", + [IP_LOCAL_NEXT_REASSEMBLY] = "ip4-full-reassembly", }, }; /* *INDENT-ON* */ diff --git a/src/vnet/ip/ip4_input.c b/src/vnet/ip/ip4_input.c index 91766b4a6c1..fa19524bad1 100644 --- a/src/vnet/ip/ip4_input.c +++ b/src/vnet/ip/ip4_input.c @@ -330,7 +330,7 @@ VLIB_REGISTER_NODE (ip4_input_node) = { [IP4_INPUT_NEXT_LOOKUP] = "ip4-lookup", [IP4_INPUT_NEXT_LOOKUP_MULTICAST] = "ip4-mfib-forward-lookup", [IP4_INPUT_NEXT_ICMP_ERROR] = "ip4-icmp-error", - [IP4_INPUT_NEXT_REASSEMBLY] = "ip4-reassembly", + [IP4_INPUT_NEXT_REASSEMBLY] = "ip4-full-reassembly", }, .format_buffer = format_ip4_header, diff --git a/src/vnet/ip/ip4_reassembly.c b/src/vnet/ip/ip4_reassembly.c deleted file mode 100644 index 682cad965af..00000000000 --- a/src/vnet/ip/ip4_reassembly.c +++ /dev/null @@ -1,1799 +0,0 @@ -/* - * Copyright (c) 2017 Cisco and/or its affiliates. - * Licensed under the Apache License, Version 2.0 (the "License"); - * you may not use this file except in compliance with the License. - * You may obtain a copy of the License at: - * - * http://www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, software - * distributed under the License is distributed on an "AS IS" BASIS, - * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - * See the License for the specific language governing permissions and - * limitations under the License. - */ - -/** - * @file - * @brief IPv4 Reassembly. - * - * This file contains the source code for IPv4 reassembly. - */ - -#include -#include -#include -#include -#include -#include - -#define MSEC_PER_SEC 1000 -#define IP4_REASS_TIMEOUT_DEFAULT_MS 100 -#define IP4_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS 10000 // 10 seconds default -#define IP4_REASS_MAX_REASSEMBLIES_DEFAULT 1024 -#define IP4_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT 3 -#define IP4_REASS_HT_LOAD_FACTOR (0.75) - -#define IP4_REASS_DEBUG_BUFFERS 0 -#if IP4_REASS_DEBUG_BUFFERS -#define IP4_REASS_DEBUG_BUFFER(bi, what) \ - do \ - { \ - u32 _bi = bi; \ - printf (#what "buffer %u", _bi); \ - vlib_buffer_t *_b = vlib_get_buffer (vm, _bi); \ - while (_b->flags & VLIB_BUFFER_NEXT_PRESENT) \ - { \ - _bi = _b->next_buffer; \ - printf ("[%u]", _bi); \ - _b = vlib_get_buffer (vm, _bi); \ - } \ - printf ("\n"); \ - fflush (stdout); \ - } \ - while (0) -#else -#define IP4_REASS_DEBUG_BUFFER(...) -#endif - -typedef enum -{ - IP4_REASS_RC_OK, - IP4_REASS_RC_TOO_MANY_FRAGMENTS, - IP4_REASS_RC_INTERNAL_ERROR, - IP4_REASS_RC_NO_BUF, - IP4_REASS_RC_HANDOFF, -} ip4_reass_rc_t; - -typedef struct -{ - union - { - struct - { - u32 xx_id; - ip4_address_t src; - ip4_address_t dst; - u16 frag_id; - u8 proto; - u8 unused; - }; - u64 as_u64[2]; - }; -} ip4_reass_key_t; - -typedef union -{ - struct - { - u32 reass_index; - u32 memory_owner_thread_index; - }; - u64 as_u64; -} ip4_reass_val_t; - -typedef union -{ - struct - { - ip4_reass_key_t k; - ip4_reass_val_t v; - }; - clib_bihash_kv_16_8_t kv; -} ip4_reass_kv_t; - -always_inline u32 -ip4_reass_buffer_get_data_offset (vlib_buffer_t * b) -{ - vnet_buffer_opaque_t *vnb = vnet_buffer (b); - return vnb->ip.reass.range_first - vnb->ip.reass.fragment_first; -} - -always_inline u16 -ip4_reass_buffer_get_data_len (vlib_buffer_t * b) -{ - vnet_buffer_opaque_t *vnb = vnet_buffer (b); - return clib_min (vnb->ip.reass.range_last, vnb->ip.reass.fragment_last) - - (vnb->ip.reass.fragment_first + ip4_reass_buffer_get_data_offset (b)) + 1; -} - -typedef struct -{ - // hash table key - ip4_reass_key_t key; - // time when last packet was received - f64 last_heard; - // internal id of this reassembly - u64 id; - // buffer index of first buffer in this reassembly context - u32 first_bi; - // last octet of packet, ~0 until fragment without more_fragments arrives - u32 last_packet_octet; - // length of data collected so far - u32 data_len; - // trace operation counter - u32 trace_op_counter; - // next index - used by non-feature node - u32 next_index; - // error next index - used by custom apps (~0 if not used) - u32 error_next_index; - // minimum fragment length for this reassembly - used to estimate MTU - u16 min_fragment_length; - // number of fragments in this reassembly - u32 fragments_n; - // thread owning memory for this context (whose pool contains this ctx) - u32 memory_owner_thread_index; - // thread which received fragment with offset 0 and which sends out the - // completed reassembly - u32 sendout_thread_index; -} ip4_reass_t; - -typedef struct -{ - // pool of reassembly contexts - ip4_reass_t *pool; - u32 reass_n; - u32 id_counter; - clib_spinlock_t lock; -} ip4_reass_per_thread_t; - -typedef struct -{ - // IPv4 config - u32 timeout_ms; - f64 timeout; - u32 expire_walk_interval_ms; - // maximum number of fragments in one reassembly - u32 max_reass_len; - // maximum number of reassemblies - u32 max_reass_n; - - // IPv4 runtime - clib_bihash_16_8_t hash; - // per-thread data - ip4_reass_per_thread_t *per_thread_data; - - // convenience - vlib_main_t *vlib_main; - - // node index of ip4-drop node - u32 ip4_drop_idx; - u32 ip4_reass_expire_node_idx; - - /** Worker handoff */ - u32 fq_index; - u32 fq_feature_index; -} ip4_reass_main_t; - -extern ip4_reass_main_t ip4_reass_main; - -#ifndef CLIB_MARCH_VARIANT -ip4_reass_main_t ip4_reass_main; -#endif /* CLIB_MARCH_VARIANT */ - -typedef enum -{ - IP4_REASSEMBLY_NEXT_INPUT, - IP4_REASSEMBLY_NEXT_DROP, - IP4_REASSEMBLY_NEXT_HANDOFF, - IP4_REASSEMBLY_N_NEXT, -} ip4_reass_next_t; - -typedef enum -{ - RANGE_NEW, - RANGE_SHRINK, - RANGE_DISCARD, - RANGE_OVERLAP, - FINALIZE, - HANDOFF, -} ip4_reass_trace_operation_e; - -typedef struct -{ - u16 range_first; - u16 range_last; - u32 range_bi; - i32 data_offset; - u32 data_len; - u32 first_bi; -} ip4_reass_range_trace_t; - -typedef struct -{ - ip4_reass_trace_operation_e action; - u32 reass_id; - ip4_reass_range_trace_t trace_range; - u32 size_diff; - u32 op_id; - u32 thread_id; - u32 thread_id_to; - u32 fragment_first; - u32 fragment_last; - u32 total_data_len; -} ip4_reass_trace_t; - -extern vlib_node_registration_t ip4_reass_node; -extern vlib_node_registration_t ip4_reass_node_feature; - -static void -ip4_reass_trace_details (vlib_main_t * vm, u32 bi, - ip4_reass_range_trace_t * trace) -{ - vlib_buffer_t *b = vlib_get_buffer (vm, bi); - vnet_buffer_opaque_t *vnb = vnet_buffer (b); - trace->range_first = vnb->ip.reass.range_first; - trace->range_last = vnb->ip.reass.range_last; - trace->data_offset = ip4_reass_buffer_get_data_offset (b); - trace->data_len = ip4_reass_buffer_get_data_len (b); - trace->range_bi = bi; -} - -static u8 * -format_ip4_reass_range_trace (u8 * s, va_list * args) -{ - ip4_reass_range_trace_t *trace = va_arg (*args, ip4_reass_range_trace_t *); - s = format (s, "range: [%u, %u], off %d, len %u, bi %u", trace->range_first, - trace->range_last, trace->data_offset, trace->data_len, - trace->range_bi); - return s; -} - -static u8 * -format_ip4_reass_trace (u8 * s, va_list * args) -{ - CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *); - CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *); - ip4_reass_trace_t *t = va_arg (*args, ip4_reass_trace_t *); - u32 indent = 0; - if (~0 != t->reass_id) - { - s = format (s, "reass id: %u, op id: %u, ", t->reass_id, t->op_id); - indent = format_get_indent (s); - s = - format (s, - "first bi: %u, data len: %u, ip/fragment[%u, %u]", - t->trace_range.first_bi, t->total_data_len, t->fragment_first, - t->fragment_last); - } - switch (t->action) - { - case RANGE_SHRINK: - s = format (s, "\n%Ushrink %U by %u", format_white_space, indent, - format_ip4_reass_range_trace, &t->trace_range, - t->size_diff); - break; - case RANGE_DISCARD: - s = format (s, "\n%Udiscard %U", format_white_space, indent, - format_ip4_reass_range_trace, &t->trace_range); - break; - case RANGE_NEW: - s = format (s, "\n%Unew %U", format_white_space, indent, - format_ip4_reass_range_trace, &t->trace_range); - break; - case RANGE_OVERLAP: - s = format (s, "\n%Uoverlapping/ignored %U", format_white_space, indent, - format_ip4_reass_range_trace, &t->trace_range); - break; - case FINALIZE: - s = format (s, "\n%Ufinalize reassembly", format_white_space, indent); - break; - case HANDOFF: - s = - format (s, "handoff from thread #%u to thread #%u", t->thread_id, - t->thread_id_to); - break; - } - return s; -} - -static void -ip4_reass_add_trace (vlib_main_t * vm, vlib_node_runtime_t * node, - ip4_reass_main_t * rm, u32 reass_id, u32 op_id, - u32 bi, u32 first_bi, u32 data_len, - ip4_reass_trace_operation_e action, u32 size_diff, - u32 thread_id_to) -{ - vlib_buffer_t *b = vlib_get_buffer (vm, bi); - vnet_buffer_opaque_t *vnb = vnet_buffer (b); - ip4_reass_trace_t *t = vlib_add_trace (vm, node, b, sizeof (t[0])); - t->reass_id = reass_id; - t->action = action; - ip4_reass_trace_details (vm, bi, &t->trace_range); - t->size_diff = size_diff; - t->op_id = op_id; - t->thread_id = vm->thread_index; - t->thread_id_to = thread_id_to; - t->fragment_first = vnb->ip.reass.fragment_first; - t->fragment_last = vnb->ip.reass.fragment_last; - t->trace_range.first_bi = first_bi; - t->total_data_len = data_len; -#if 0 - static u8 *s = NULL; - s = format (s, "%U", format_ip4_reass_trace, NULL, NULL, t); - printf ("%.*s\n", vec_len (s), s); - fflush (stdout); - vec_reset_length (s); -#endif -} - -always_inline void -ip4_reass_free_ctx (ip4_reass_per_thread_t * rt, ip4_reass_t * reass) -{ - pool_put (rt->pool, reass); - --rt->reass_n; -} - -always_inline void -ip4_reass_free (vlib_main_t * vm, ip4_reass_main_t * rm, - ip4_reass_per_thread_t * rt, ip4_reass_t * reass) -{ - clib_bihash_kv_16_8_t kv; - kv.key[0] = reass->key.as_u64[0]; - kv.key[1] = reass->key.as_u64[1]; - clib_bihash_add_del_16_8 (&rm->hash, &kv, 0); - return ip4_reass_free_ctx (rt, reass); -} - -always_inline void -ip4_reass_drop_all (vlib_main_t * vm, vlib_node_runtime_t * node, - ip4_reass_main_t * rm, ip4_reass_t * reass) -{ - u32 range_bi = reass->first_bi; - vlib_buffer_t *range_b; - vnet_buffer_opaque_t *range_vnb; - u32 *to_free = NULL; - while (~0 != range_bi) - { - range_b = vlib_get_buffer (vm, range_bi); - range_vnb = vnet_buffer (range_b); - u32 bi = range_bi; - while (~0 != bi) - { - vec_add1 (to_free, bi); - vlib_buffer_t *b = vlib_get_buffer (vm, bi); - if (b->flags & VLIB_BUFFER_NEXT_PRESENT) - { - bi = b->next_buffer; - b->flags &= ~VLIB_BUFFER_NEXT_PRESENT; - } - else - { - bi = ~0; - } - } - range_bi = range_vnb->ip.reass.next_range_bi; - } - /* send to next_error_index */ - if (~0 != reass->error_next_index) - { - u32 n_left_to_next, *to_next, next_index; - - next_index = reass->error_next_index; - u32 bi = ~0; - - while (vec_len (to_free) > 0) - { - vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); - - while (vec_len (to_free) > 0 && n_left_to_next > 0) - { - bi = vec_pop (to_free); - - if (~0 != bi) - { - to_next[0] = bi; - to_next += 1; - n_left_to_next -= 1; - } - } - vlib_put_next_frame (vm, node, next_index, n_left_to_next); - } - } - else - { - vlib_buffer_free (vm, to_free, vec_len (to_free)); - } -} - -static ip4_reass_t * -ip4_reass_find_or_create (vlib_main_t * vm, vlib_node_runtime_t * node, - ip4_reass_main_t * rm, ip4_reass_per_thread_t * rt, - ip4_reass_kv_t * kv, u8 * do_handoff) -{ - ip4_reass_t *reass; - f64 now; - -again: - - reass = NULL; - now = vlib_time_now (vm); - if (!clib_bihash_search_16_8 - (&rm->hash, (clib_bihash_kv_16_8_t *) kv, (clib_bihash_kv_16_8_t *) kv)) - { - reass = - pool_elt_at_index (rm->per_thread_data - [kv->v.memory_owner_thread_index].pool, - kv->v.reass_index); - if (vm->thread_index != reass->memory_owner_thread_index) - { - *do_handoff = 1; - return reass; - } - - if (now > reass->last_heard + rm->timeout) - { - ip4_reass_drop_all (vm, node, rm, reass); - ip4_reass_free (vm, rm, rt, reass); - reass = NULL; - } - } - - if (reass) - { - reass->last_heard = now; - return reass; - } - - if (rt->reass_n >= rm->max_reass_n) - { - reass = NULL; - return reass; - } - else - { - pool_get (rt->pool, reass); - clib_memset (reass, 0, sizeof (*reass)); - reass->id = ((u64) vm->thread_index * 1000000000) + rt->id_counter; - reass->memory_owner_thread_index = vm->thread_index; - ++rt->id_counter; - reass->first_bi = ~0; - reass->last_packet_octet = ~0; - reass->data_len = 0; - reass->next_index = ~0; - reass->error_next_index = ~0; - ++rt->reass_n; - } - - reass->key.as_u64[0] = ((clib_bihash_kv_16_8_t *) kv)->key[0]; - reass->key.as_u64[1] = ((clib_bihash_kv_16_8_t *) kv)->key[1]; - kv->v.reass_index = (reass - rt->pool); - kv->v.memory_owner_thread_index = vm->thread_index; - reass->last_heard = now; - - int rv = - clib_bihash_add_del_16_8 (&rm->hash, (clib_bihash_kv_16_8_t *) kv, 2); - if (rv) - { - ip4_reass_free_ctx (rt, reass); - reass = NULL; - // if other worker created a context already work with the other copy - if (-2 == rv) - goto again; - } - - return reass; -} - -always_inline ip4_reass_rc_t -ip4_reass_finalize (vlib_main_t * vm, vlib_node_runtime_t * node, - ip4_reass_main_t * rm, ip4_reass_per_thread_t * rt, - ip4_reass_t * reass, u32 * bi0, u32 * next0, u32 * error0, - bool is_custom_app) -{ - vlib_buffer_t *first_b = vlib_get_buffer (vm, reass->first_bi); - vlib_buffer_t *last_b = NULL; - u32 sub_chain_bi = reass->first_bi; - u32 total_length = 0; - u32 buf_cnt = 0; - do - { - u32 tmp_bi = sub_chain_bi; - vlib_buffer_t *tmp = vlib_get_buffer (vm, tmp_bi); - ip4_header_t *ip = vlib_buffer_get_current (tmp); - vnet_buffer_opaque_t *vnb = vnet_buffer (tmp); - if (!(vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first) && - !(vnb->ip.reass.range_last > vnb->ip.reass.fragment_first)) - { - return IP4_REASS_RC_INTERNAL_ERROR; - } - - u32 data_len = ip4_reass_buffer_get_data_len (tmp); - u32 trim_front = - ip4_header_bytes (ip) + ip4_reass_buffer_get_data_offset (tmp); - u32 trim_end = - vlib_buffer_length_in_chain (vm, tmp) - trim_front - data_len; - if (tmp_bi == reass->first_bi) - { - /* first buffer - keep ip4 header */ - if (0 != ip4_reass_buffer_get_data_offset (tmp)) - { - return IP4_REASS_RC_INTERNAL_ERROR; - } - trim_front = 0; - trim_end = vlib_buffer_length_in_chain (vm, tmp) - data_len - - ip4_header_bytes (ip); - if (!(vlib_buffer_length_in_chain (vm, tmp) - trim_end > 0)) - { - return IP4_REASS_RC_INTERNAL_ERROR; - } - } - u32 keep_data = - vlib_buffer_length_in_chain (vm, tmp) - trim_front - trim_end; - while (1) - { - ++buf_cnt; - if (trim_front) - { - if (trim_front > tmp->current_length) - { - /* drop whole buffer */ - u32 to_be_freed_bi = tmp_bi; - trim_front -= tmp->current_length; - if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT)) - { - return IP4_REASS_RC_INTERNAL_ERROR; - } - tmp->flags &= ~VLIB_BUFFER_NEXT_PRESENT; - tmp_bi = tmp->next_buffer; - tmp->next_buffer = 0; - tmp = vlib_get_buffer (vm, tmp_bi); - vlib_buffer_free_one (vm, to_be_freed_bi); - continue; - } - else - { - vlib_buffer_advance (tmp, trim_front); - trim_front = 0; - } - } - if (keep_data) - { - if (last_b) - { - last_b->flags |= VLIB_BUFFER_NEXT_PRESENT; - last_b->next_buffer = tmp_bi; - } - last_b = tmp; - if (keep_data <= tmp->current_length) - { - tmp->current_length = keep_data; - keep_data = 0; - } - else - { - keep_data -= tmp->current_length; - if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT)) - { - return IP4_REASS_RC_INTERNAL_ERROR; - } - } - total_length += tmp->current_length; - if (tmp->flags & VLIB_BUFFER_NEXT_PRESENT) - { - tmp_bi = tmp->next_buffer; - tmp = vlib_get_buffer (vm, tmp->next_buffer); - } - else - { - break; - } - } - else - { - u32 to_be_freed_bi = tmp_bi; - if (reass->first_bi == tmp_bi) - { - return IP4_REASS_RC_INTERNAL_ERROR; - } - if (tmp->flags & VLIB_BUFFER_NEXT_PRESENT) - { - tmp->flags &= ~VLIB_BUFFER_NEXT_PRESENT; - tmp_bi = tmp->next_buffer; - tmp->next_buffer = 0; - tmp = vlib_get_buffer (vm, tmp_bi); - vlib_buffer_free_one (vm, to_be_freed_bi); - } - else - { - tmp->next_buffer = 0; - vlib_buffer_free_one (vm, to_be_freed_bi); - break; - } - } - } - sub_chain_bi = - vnet_buffer (vlib_get_buffer (vm, sub_chain_bi))->ip. - reass.next_range_bi; - } - while (~0 != sub_chain_bi); - - if (!last_b) - { - return IP4_REASS_RC_INTERNAL_ERROR; - } - last_b->flags &= ~VLIB_BUFFER_NEXT_PRESENT; - - if (total_length < first_b->current_length) - { - return IP4_REASS_RC_INTERNAL_ERROR; - } - total_length -= first_b->current_length; - first_b->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID; - first_b->total_length_not_including_first_buffer = total_length; - ip4_header_t *ip = vlib_buffer_get_current (first_b); - ip->flags_and_fragment_offset = 0; - ip->length = clib_host_to_net_u16 (first_b->current_length + total_length); - ip->checksum = ip4_header_checksum (ip); - if (!vlib_buffer_chain_linearize (vm, first_b)) - { - return IP4_REASS_RC_NO_BUF; - } - // reset to reconstruct the mbuf linking - first_b->flags &= ~VLIB_BUFFER_EXT_HDR_VALID; - if (PREDICT_FALSE (first_b->flags & VLIB_BUFFER_IS_TRACED)) - { - ip4_reass_add_trace (vm, node, rm, reass->id, reass->trace_op_counter, - reass->first_bi, reass->first_bi, reass->data_len, - FINALIZE, 0, ~0); - ++reass->trace_op_counter; -#if 0 - // following code does a hexdump of packet fragments to stdout ... - do - { - u32 bi = reass->first_bi; - u8 *s = NULL; - while (~0 != bi) - { - vlib_buffer_t *b = vlib_get_buffer (vm, bi); - s = format (s, "%u: %U\n", bi, format_hexdump, - vlib_buffer_get_current (b), b->current_length); - if (b->flags & VLIB_BUFFER_NEXT_PRESENT) - { - bi = b->next_buffer; - } - else - { - break; - } - } - printf ("%.*s\n", vec_len (s), s); - fflush (stdout); - vec_free (s); - } - while (0); -#endif - } - *bi0 = reass->first_bi; - if (!is_custom_app) - { - *next0 = IP4_REASSEMBLY_NEXT_INPUT; - } - else - { - *next0 = reass->next_index; - } - vnet_buffer (first_b)->ip.reass.estimated_mtu = reass->min_fragment_length; - *error0 = IP4_ERROR_NONE; - ip4_reass_free (vm, rm, rt, reass); - reass = NULL; - return IP4_REASS_RC_OK; -} - -always_inline ip4_reass_rc_t -ip4_reass_insert_range_in_chain (vlib_main_t * vm, - ip4_reass_main_t * rm, - ip4_reass_per_thread_t * rt, - ip4_reass_t * reass, - u32 prev_range_bi, u32 new_next_bi) -{ - vlib_buffer_t *new_next_b = vlib_get_buffer (vm, new_next_bi); - vnet_buffer_opaque_t *new_next_vnb = vnet_buffer (new_next_b); - if (~0 != prev_range_bi) - { - vlib_buffer_t *prev_b = vlib_get_buffer (vm, prev_range_bi); - vnet_buffer_opaque_t *prev_vnb = vnet_buffer (prev_b); - new_next_vnb->ip.reass.next_range_bi = prev_vnb->ip.reass.next_range_bi; - prev_vnb->ip.reass.next_range_bi = new_next_bi; - } - else - { - if (~0 != reass->first_bi) - { - new_next_vnb->ip.reass.next_range_bi = reass->first_bi; - } - reass->first_bi = new_next_bi; - } - vnet_buffer_opaque_t *vnb = vnet_buffer (new_next_b); - if (!(vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first) && - !(vnb->ip.reass.range_last > vnb->ip.reass.fragment_first)) - { - return IP4_REASS_RC_INTERNAL_ERROR; - } - reass->data_len += ip4_reass_buffer_get_data_len (new_next_b); - return IP4_REASS_RC_OK; -} - -always_inline ip4_reass_rc_t -ip4_reass_remove_range_from_chain (vlib_main_t * vm, - vlib_node_runtime_t * node, - ip4_reass_main_t * rm, - ip4_reass_t * reass, u32 prev_range_bi, - u32 discard_bi) -{ - vlib_buffer_t *discard_b = vlib_get_buffer (vm, discard_bi); - vnet_buffer_opaque_t *discard_vnb = vnet_buffer (discard_b); - if (~0 != prev_range_bi) - { - vlib_buffer_t *prev_b = vlib_get_buffer (vm, prev_range_bi); - vnet_buffer_opaque_t *prev_vnb = vnet_buffer (prev_b); - if (!(prev_vnb->ip.reass.next_range_bi == discard_bi)) - { - return IP4_REASS_RC_INTERNAL_ERROR; - } - prev_vnb->ip.reass.next_range_bi = discard_vnb->ip.reass.next_range_bi; - } - else - { - reass->first_bi = discard_vnb->ip.reass.next_range_bi; - } - vnet_buffer_opaque_t *vnb = vnet_buffer (discard_b); - if (!(vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first) && - !(vnb->ip.reass.range_last > vnb->ip.reass.fragment_first)) - { - return IP4_REASS_RC_INTERNAL_ERROR; - } - reass->data_len -= ip4_reass_buffer_get_data_len (discard_b); - while (1) - { - u32 to_be_freed_bi = discard_bi; - if (PREDICT_FALSE (discard_b->flags & VLIB_BUFFER_IS_TRACED)) - { - ip4_reass_add_trace (vm, node, rm, reass->id, - reass->trace_op_counter, discard_bi, - reass->first_bi, reass->data_len, - RANGE_DISCARD, 0, ~0); - ++reass->trace_op_counter; - } - if (discard_b->flags & VLIB_BUFFER_NEXT_PRESENT) - { - discard_b->flags &= ~VLIB_BUFFER_NEXT_PRESENT; - discard_bi = discard_b->next_buffer; - discard_b->next_buffer = 0; - discard_b = vlib_get_buffer (vm, discard_bi); - vlib_buffer_free_one (vm, to_be_freed_bi); - } - else - { - discard_b->next_buffer = 0; - vlib_buffer_free_one (vm, to_be_freed_bi); - break; - } - } - return IP4_REASS_RC_OK; -} - -always_inline ip4_reass_rc_t -ip4_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node, - ip4_reass_main_t * rm, ip4_reass_per_thread_t * rt, - ip4_reass_t * reass, u32 * bi0, u32 * next0, u32 * error0, - bool is_custom_app, u32 * handoff_thread_idx) -{ - ip4_reass_rc_t rc = IP4_REASS_RC_OK; - int consumed = 0; - vlib_buffer_t *fb = vlib_get_buffer (vm, *bi0); - ip4_header_t *fip = vlib_buffer_get_current (fb); - vnet_buffer_opaque_t *fvnb = vnet_buffer (fb); - if (is_custom_app) - { - // store (error_)next_index before it's overwritten - reass->next_index = fvnb->ip.reass.next_index; - reass->error_next_index = fvnb->ip.reass.error_next_index; - } - const u32 fragment_first = ip4_get_fragment_offset_bytes (fip); - const u32 fragment_length = - clib_net_to_host_u16 (fip->length) - ip4_header_bytes (fip); - const u32 fragment_last = fragment_first + fragment_length - 1; - fvnb->ip.reass.fragment_first = fragment_first; - fvnb->ip.reass.fragment_last = fragment_last; - int more_fragments = ip4_get_fragment_more (fip); - u32 candidate_range_bi = reass->first_bi; - u32 prev_range_bi = ~0; - fvnb->ip.reass.range_first = fragment_first; - fvnb->ip.reass.range_last = fragment_last; - fvnb->ip.reass.next_range_bi = ~0; - if (!more_fragments) - { - reass->last_packet_octet = fragment_last; - } - if (~0 == reass->first_bi) - { - // starting a new reassembly - rc = - ip4_reass_insert_range_in_chain (vm, rm, rt, reass, prev_range_bi, - *bi0); - if (IP4_REASS_RC_OK != rc) - { - return rc; - } - if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED)) - { - ip4_reass_add_trace (vm, node, rm, reass->id, - reass->trace_op_counter, *bi0, reass->first_bi, - reass->data_len, RANGE_NEW, 0, ~0); - ++reass->trace_op_counter; - } - *bi0 = ~0; - reass->min_fragment_length = clib_net_to_host_u16 (fip->length); - reass->fragments_n = 1; - return IP4_REASS_RC_OK; - } - reass->min_fragment_length = clib_min (clib_net_to_host_u16 (fip->length), - fvnb->ip.reass.estimated_mtu); - while (~0 != candidate_range_bi) - { - vlib_buffer_t *candidate_b = vlib_get_buffer (vm, candidate_range_bi); - vnet_buffer_opaque_t *candidate_vnb = vnet_buffer (candidate_b); - if (fragment_first > candidate_vnb->ip.reass.range_last) - { - // this fragments starts after candidate range - prev_range_bi = candidate_range_bi; - candidate_range_bi = candidate_vnb->ip.reass.next_range_bi; - if (candidate_vnb->ip.reass.range_last < fragment_last && - ~0 == candidate_range_bi) - { - // special case - this fragment falls beyond all known ranges - rc = - ip4_reass_insert_range_in_chain (vm, rm, rt, reass, - prev_range_bi, *bi0); - if (IP4_REASS_RC_OK != rc) - { - return rc; - } - consumed = 1; - break; - } - continue; - } - if (fragment_last < candidate_vnb->ip.reass.range_first) - { - // this fragment ends before candidate range without any overlap - rc = - ip4_reass_insert_range_in_chain (vm, rm, rt, reass, prev_range_bi, - *bi0); - if (IP4_REASS_RC_OK != rc) - { - return rc; - } - consumed = 1; - } - else - { - if (fragment_first >= candidate_vnb->ip.reass.range_first && - fragment_last <= candidate_vnb->ip.reass.range_last) - { - // this fragment is a (sub)part of existing range, ignore it - if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED)) - { - ip4_reass_add_trace (vm, node, rm, reass->id, - reass->trace_op_counter, *bi0, - reass->first_bi, reass->data_len, - RANGE_OVERLAP, 0, ~0); - ++reass->trace_op_counter; - } - break; - } - int discard_candidate = 0; - if (fragment_first < candidate_vnb->ip.reass.range_first) - { - u32 overlap = - fragment_last - candidate_vnb->ip.reass.range_first + 1; - if (overlap < ip4_reass_buffer_get_data_len (candidate_b)) - { - candidate_vnb->ip.reass.range_first += overlap; - if (reass->data_len < overlap) - { - return IP4_REASS_RC_INTERNAL_ERROR; - } - reass->data_len -= overlap; - if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED)) - { - ip4_reass_add_trace (vm, node, rm, reass->id, - reass->trace_op_counter, - candidate_range_bi, - reass->first_bi, reass->data_len, - RANGE_SHRINK, 0, ~0); - ++reass->trace_op_counter; - } - rc = - ip4_reass_insert_range_in_chain (vm, rm, rt, reass, - prev_range_bi, *bi0); - if (IP4_REASS_RC_OK != rc) - { - return rc; - } - consumed = 1; - } - else - { - discard_candidate = 1; - } - } - else if (fragment_last > candidate_vnb->ip.reass.range_last) - { - u32 overlap = - candidate_vnb->ip.reass.range_last - fragment_first + 1; - if (overlap < ip4_reass_buffer_get_data_len (candidate_b)) - { - fvnb->ip.reass.range_first += overlap; - if (~0 != candidate_vnb->ip.reass.next_range_bi) - { - prev_range_bi = candidate_range_bi; - candidate_range_bi = - candidate_vnb->ip.reass.next_range_bi; - continue; - } - else - { - // special case - last range discarded - rc = - ip4_reass_insert_range_in_chain (vm, rm, rt, reass, - candidate_range_bi, - *bi0); - if (IP4_REASS_RC_OK != rc) - { - return rc; - } - consumed = 1; - } - } - else - { - discard_candidate = 1; - } - } - else - { - discard_candidate = 1; - } - if (discard_candidate) - { - u32 next_range_bi = candidate_vnb->ip.reass.next_range_bi; - // discard candidate range, probe next range - rc = - ip4_reass_remove_range_from_chain (vm, node, rm, reass, - prev_range_bi, - candidate_range_bi); - if (IP4_REASS_RC_OK != rc) - { - return rc; - } - if (~0 != next_range_bi) - { - candidate_range_bi = next_range_bi; - continue; - } - else - { - // special case - last range discarded - rc = - ip4_reass_insert_range_in_chain (vm, rm, rt, reass, - prev_range_bi, *bi0); - if (IP4_REASS_RC_OK != rc) - { - return rc; - } - consumed = 1; - } - } - } - break; - } - ++reass->fragments_n; - if (consumed) - { - if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED)) - { - ip4_reass_add_trace (vm, node, rm, reass->id, - reass->trace_op_counter, *bi0, reass->first_bi, - reass->data_len, RANGE_NEW, 0, ~0); - ++reass->trace_op_counter; - } - } - if (~0 != reass->last_packet_octet && - reass->data_len == reass->last_packet_octet + 1) - { - *handoff_thread_idx = reass->sendout_thread_index; - rc = - ip4_reass_finalize (vm, node, rm, rt, reass, bi0, next0, error0, - is_custom_app); - if (IP4_REASS_RC_OK == rc - && reass->memory_owner_thread_index != reass->sendout_thread_index) - { - rc = IP4_REASS_RC_HANDOFF; - } - } - else - { - if (consumed) - { - *bi0 = ~0; - if (reass->fragments_n > rm->max_reass_len) - { - rc = IP4_REASS_RC_TOO_MANY_FRAGMENTS; - } - } - else - { - *next0 = IP4_REASSEMBLY_NEXT_DROP; - *error0 = IP4_ERROR_REASS_DUPLICATE_FRAGMENT; - } - } - return rc; -} - -always_inline uword -ip4_reassembly_inline (vlib_main_t * vm, vlib_node_runtime_t * node, - vlib_frame_t * frame, bool is_feature, - bool is_custom_app) -{ - u32 *from = vlib_frame_vector_args (frame); - u32 n_left_from, n_left_to_next, *to_next, next_index; - ip4_reass_main_t *rm = &ip4_reass_main; - ip4_reass_per_thread_t *rt = &rm->per_thread_data[vm->thread_index]; - clib_spinlock_lock (&rt->lock); - - n_left_from = frame->n_vectors; - next_index = node->cached_next_index; - while (n_left_from > 0) - { - vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); - - while (n_left_from > 0 && n_left_to_next > 0) - { - u32 bi0; - vlib_buffer_t *b0; - u32 next0; - u32 error0 = IP4_ERROR_NONE; - - bi0 = from[0]; - b0 = vlib_get_buffer (vm, bi0); - - ip4_header_t *ip0 = vlib_buffer_get_current (b0); - if (!ip4_get_fragment_more (ip0) && !ip4_get_fragment_offset (ip0)) - { - // this is a whole packet - no fragmentation - if (!is_custom_app) - { - next0 = IP4_REASSEMBLY_NEXT_INPUT; - } - else - { - next0 = vnet_buffer (b0)->ip.reass.next_index; - } - } - else - { - const u32 fragment_first = ip4_get_fragment_offset_bytes (ip0); - const u32 fragment_length = - clib_net_to_host_u16 (ip0->length) - ip4_header_bytes (ip0); - const u32 fragment_last = fragment_first + fragment_length - 1; - if (fragment_first > fragment_last || fragment_first + fragment_length > UINT16_MAX - 20 || (fragment_length < 8 && ip4_get_fragment_more (ip0))) // 8 is minimum frag length per RFC 791 - { - next0 = IP4_REASSEMBLY_NEXT_DROP; - error0 = IP4_ERROR_REASS_MALFORMED_PACKET; - } - else - { - ip4_reass_kv_t kv; - u8 do_handoff = 0; - - kv.k.as_u64[0] = - (u64) vec_elt (ip4_main.fib_index_by_sw_if_index, - vnet_buffer (b0)->sw_if_index[VLIB_RX]) | - (u64) ip0->src_address.as_u32 << 32; - kv.k.as_u64[1] = - (u64) ip0->dst_address.as_u32 | - (u64) ip0->fragment_id << 32 | (u64) ip0->protocol << 48; - - ip4_reass_t *reass = - ip4_reass_find_or_create (vm, node, rm, rt, &kv, - &do_handoff); - if (reass) - { - const u32 fragment_first = - ip4_get_fragment_offset_bytes (ip0); - if (0 == fragment_first) - { - reass->sendout_thread_index = vm->thread_index; - } - } - if (PREDICT_FALSE (do_handoff)) - { - next0 = IP4_REASSEMBLY_NEXT_HANDOFF; - if (is_feature) - vnet_buffer (b0)->ip. - reass.owner_feature_thread_index = - kv.v.memory_owner_thread_index; - else - vnet_buffer (b0)->ip.reass.owner_thread_index = - kv.v.memory_owner_thread_index; - } - else if (reass) - { - u32 handoff_thread_idx; - switch (ip4_reass_update - (vm, node, rm, rt, reass, &bi0, &next0, - &error0, is_custom_app, &handoff_thread_idx)) - { - case IP4_REASS_RC_OK: - /* nothing to do here */ - break; - case IP4_REASS_RC_HANDOFF: - next0 = IP4_REASSEMBLY_NEXT_HANDOFF; - b0 = vlib_get_buffer (vm, bi0); - if (is_feature) - vnet_buffer (b0)->ip. - reass.owner_feature_thread_index = - handoff_thread_idx; - else - vnet_buffer (b0)->ip.reass.owner_thread_index = - handoff_thread_idx; - break; - case IP4_REASS_RC_TOO_MANY_FRAGMENTS: - vlib_node_increment_counter (vm, node->node_index, - IP4_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG, - 1); - ip4_reass_drop_all (vm, node, rm, reass); - ip4_reass_free (vm, rm, rt, reass); - goto next_packet; - break; - case IP4_REASS_RC_NO_BUF: - vlib_node_increment_counter (vm, node->node_index, - IP4_ERROR_REASS_NO_BUF, - 1); - ip4_reass_drop_all (vm, node, rm, reass); - ip4_reass_free (vm, rm, rt, reass); - goto next_packet; - break; - case IP4_REASS_RC_INTERNAL_ERROR: - /* drop everything and start with a clean slate */ - vlib_node_increment_counter (vm, node->node_index, - IP4_ERROR_REASS_INTERNAL_ERROR, - 1); - ip4_reass_drop_all (vm, node, rm, reass); - ip4_reass_free (vm, rm, rt, reass); - goto next_packet; - break; - } - } - else - { - next0 = IP4_REASSEMBLY_NEXT_DROP; - error0 = IP4_ERROR_REASS_LIMIT_REACHED; - } - } - - b0->error = node->errors[error0]; - } - - if (bi0 != ~0) - { - to_next[0] = bi0; - to_next += 1; - n_left_to_next -= 1; - if (next0 == IP4_REASSEMBLY_NEXT_HANDOFF) - { - if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) - { - if (is_feature) - ip4_reass_add_trace (vm, node, rm, ~0, - ~0, - bi0, ~0, ~0, HANDOFF, 0, - vnet_buffer (b0)->ip. - reass.owner_feature_thread_index); - else - ip4_reass_add_trace (vm, node, rm, ~0, ~0, bi0, - ~0, ~0, HANDOFF, 0, - vnet_buffer (b0)->ip. - reass.owner_thread_index); - } - } - else if (is_feature && IP4_ERROR_NONE == error0) - { - b0 = vlib_get_buffer (vm, bi0); - vnet_feature_next (&next0, b0); - } - vlib_validate_buffer_enqueue_x1 (vm, node, next_index, - to_next, n_left_to_next, - bi0, next0); - IP4_REASS_DEBUG_BUFFER (bi0, enqueue_next); - } - - next_packet: - from += 1; - n_left_from -= 1; - } - - vlib_put_next_frame (vm, node, next_index, n_left_to_next); - } - - clib_spinlock_unlock (&rt->lock); - return frame->n_vectors; -} - -static char *ip4_reassembly_error_strings[] = { -#define _(sym, string) string, - foreach_ip4_error -#undef _ -}; - -VLIB_NODE_FN (ip4_reass_node) (vlib_main_t * vm, vlib_node_runtime_t * node, - vlib_frame_t * frame) -{ - return ip4_reassembly_inline (vm, node, frame, false /* is_feature */ , - false /* is_custom_app */ ); -} - -/* *INDENT-OFF* */ -VLIB_REGISTER_NODE (ip4_reass_node) = { - .name = "ip4-reassembly", - .vector_size = sizeof (u32), - .format_trace = format_ip4_reass_trace, - .n_errors = ARRAY_LEN (ip4_reassembly_error_strings), - .error_strings = ip4_reassembly_error_strings, - .n_next_nodes = IP4_REASSEMBLY_N_NEXT, - .next_nodes = - { - [IP4_REASSEMBLY_NEXT_INPUT] = "ip4-input", - [IP4_REASSEMBLY_NEXT_DROP] = "ip4-drop", - [IP4_REASSEMBLY_NEXT_HANDOFF] = "ip4-reassembly-handoff", - - }, -}; -/* *INDENT-ON* */ - -VLIB_NODE_FN (ip4_reass_node_feature) (vlib_main_t * vm, - vlib_node_runtime_t * node, - vlib_frame_t * frame) -{ - return ip4_reassembly_inline (vm, node, frame, true /* is_feature */ , - false /* is_custom_app */ ); -} - -/* *INDENT-OFF* */ -VLIB_REGISTER_NODE (ip4_reass_node_feature) = { - .name = "ip4-reassembly-feature", - .vector_size = sizeof (u32), - .format_trace = format_ip4_reass_trace, - .n_errors = ARRAY_LEN (ip4_reassembly_error_strings), - .error_strings = ip4_reassembly_error_strings, - .n_next_nodes = IP4_REASSEMBLY_N_NEXT, - .next_nodes = - { - [IP4_REASSEMBLY_NEXT_INPUT] = "ip4-input", - [IP4_REASSEMBLY_NEXT_DROP] = "ip4-drop", - [IP4_REASSEMBLY_NEXT_HANDOFF] = "ip4-reass-feature-hoff", - }, -}; -/* *INDENT-ON* */ - -/* *INDENT-OFF* */ -VNET_FEATURE_INIT (ip4_reassembly_feature, static) = { - .arc_name = "ip4-unicast", - .node_name = "ip4-reassembly-feature", - .runs_before = VNET_FEATURES ("ip4-lookup", - "ipsec4-input-feature"), - .runs_after = 0, -}; -/* *INDENT-ON* */ - -#ifndef CLIB_MARCH_VARIANT -always_inline u32 -ip4_reass_get_nbuckets () -{ - ip4_reass_main_t *rm = &ip4_reass_main; - u32 nbuckets; - u8 i; - - nbuckets = (u32) (rm->max_reass_n / IP4_REASS_HT_LOAD_FACTOR); - - for (i = 0; i < 31; i++) - if ((1 << i) >= nbuckets) - break; - nbuckets = 1 << i; - - return nbuckets; -} -#endif /* CLIB_MARCH_VARIANT */ - -typedef enum -{ - IP4_EVENT_CONFIG_CHANGED = 1, -} ip4_reass_event_t; - -typedef struct -{ - int failure; - clib_bihash_16_8_t *new_hash; -} ip4_rehash_cb_ctx; - -#ifndef CLIB_MARCH_VARIANT -static void -ip4_rehash_cb (clib_bihash_kv_16_8_t * kv, void *_ctx) -{ - ip4_rehash_cb_ctx *ctx = _ctx; - if (clib_bihash_add_del_16_8 (ctx->new_hash, kv, 1)) - { - ctx->failure = 1; - } -} - -static void -ip4_reass_set_params (u32 timeout_ms, u32 max_reassemblies, - u32 max_reassembly_length, u32 expire_walk_interval_ms) -{ - ip4_reass_main.timeout_ms = timeout_ms; - ip4_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC; - ip4_reass_main.max_reass_n = max_reassemblies; - ip4_reass_main.max_reass_len = max_reassembly_length; - ip4_reass_main.expire_walk_interval_ms = expire_walk_interval_ms; -} - -vnet_api_error_t -ip4_reass_set (u32 timeout_ms, u32 max_reassemblies, - u32 max_reassembly_length, u32 expire_walk_interval_ms) -{ - u32 old_nbuckets = ip4_reass_get_nbuckets (); - ip4_reass_set_params (timeout_ms, max_reassemblies, max_reassembly_length, - expire_walk_interval_ms); - vlib_process_signal_event (ip4_reass_main.vlib_main, - ip4_reass_main.ip4_reass_expire_node_idx, - IP4_EVENT_CONFIG_CHANGED, 0); - u32 new_nbuckets = ip4_reass_get_nbuckets (); - if (ip4_reass_main.max_reass_n > 0 && new_nbuckets > old_nbuckets) - { - clib_bihash_16_8_t new_hash; - clib_memset (&new_hash, 0, sizeof (new_hash)); - ip4_rehash_cb_ctx ctx; - ctx.failure = 0; - ctx.new_hash = &new_hash; - clib_bihash_init_16_8 (&new_hash, "ip4-reass", new_nbuckets, - new_nbuckets * 1024); - clib_bihash_foreach_key_value_pair_16_8 (&ip4_reass_main.hash, - ip4_rehash_cb, &ctx); - if (ctx.failure) - { - clib_bihash_free_16_8 (&new_hash); - return -1; - } - else - { - clib_bihash_free_16_8 (&ip4_reass_main.hash); - clib_memcpy_fast (&ip4_reass_main.hash, &new_hash, - sizeof (ip4_reass_main.hash)); - clib_bihash_copied (&ip4_reass_main.hash, &new_hash); - } - } - return 0; -} - -vnet_api_error_t -ip4_reass_get (u32 * timeout_ms, u32 * max_reassemblies, - u32 * max_reassembly_length, u32 * expire_walk_interval_ms) -{ - *timeout_ms = ip4_reass_main.timeout_ms; - *max_reassemblies = ip4_reass_main.max_reass_n; - *max_reassembly_length = ip4_reass_main.max_reass_len; - *expire_walk_interval_ms = ip4_reass_main.expire_walk_interval_ms; - return 0; -} - -static clib_error_t * -ip4_reass_init_function (vlib_main_t * vm) -{ - ip4_reass_main_t *rm = &ip4_reass_main; - clib_error_t *error = 0; - u32 nbuckets; - vlib_node_t *node; - - rm->vlib_main = vm; - - vec_validate (rm->per_thread_data, vlib_num_workers ()); - ip4_reass_per_thread_t *rt; - vec_foreach (rt, rm->per_thread_data) - { - clib_spinlock_init (&rt->lock); - pool_alloc (rt->pool, rm->max_reass_n); - } - - node = vlib_get_node_by_name (vm, (u8 *) "ip4-reassembly-expire-walk"); - ASSERT (node); - rm->ip4_reass_expire_node_idx = node->index; - - ip4_reass_set_params (IP4_REASS_TIMEOUT_DEFAULT_MS, - IP4_REASS_MAX_REASSEMBLIES_DEFAULT, - IP4_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT, - IP4_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS); - - nbuckets = ip4_reass_get_nbuckets (); - clib_bihash_init_16_8 (&rm->hash, "ip4-reass", nbuckets, nbuckets * 1024); - - node = vlib_get_node_by_name (vm, (u8 *) "ip4-drop"); - ASSERT (node); - rm->ip4_drop_idx = node->index; - - rm->fq_index = vlib_frame_queue_main_init (ip4_reass_node.index, 0); - rm->fq_feature_index = - vlib_frame_queue_main_init (ip4_reass_node_feature.index, 0); - - return error; -} - -VLIB_INIT_FUNCTION (ip4_reass_init_function); -#endif /* CLIB_MARCH_VARIANT */ - -static uword -ip4_reass_walk_expired (vlib_main_t * vm, - vlib_node_runtime_t * node, vlib_frame_t * f) -{ - ip4_reass_main_t *rm = &ip4_reass_main; - uword event_type, *event_data = 0; - - while (true) - { - vlib_process_wait_for_event_or_clock (vm, - (f64) - rm->expire_walk_interval_ms / - (f64) MSEC_PER_SEC); - event_type = vlib_process_get_events (vm, &event_data); - - switch (event_type) - { - case ~0: /* no events => timeout */ - /* nothing to do here */ - break; - case IP4_EVENT_CONFIG_CHANGED: - break; - default: - clib_warning ("BUG: event type 0x%wx", event_type); - break; - } - f64 now = vlib_time_now (vm); - - ip4_reass_t *reass; - int *pool_indexes_to_free = NULL; - - uword thread_index = 0; - int index; - const uword nthreads = vlib_num_workers () + 1; - for (thread_index = 0; thread_index < nthreads; ++thread_index) - { - ip4_reass_per_thread_t *rt = &rm->per_thread_data[thread_index]; - clib_spinlock_lock (&rt->lock); - - vec_reset_length (pool_indexes_to_free); - /* *INDENT-OFF* */ - pool_foreach_index (index, rt->pool, ({ - reass = pool_elt_at_index (rt->pool, index); - if (now > reass->last_heard + rm->timeout) - { - vec_add1 (pool_indexes_to_free, index); - } - })); - /* *INDENT-ON* */ - int *i; - /* *INDENT-OFF* */ - vec_foreach (i, pool_indexes_to_free) - { - ip4_reass_t *reass = pool_elt_at_index (rt->pool, i[0]); - ip4_reass_drop_all (vm, node, rm, reass); - ip4_reass_free (vm, rm, rt, reass); - } - /* *INDENT-ON* */ - - clib_spinlock_unlock (&rt->lock); - } - - vec_free (pool_indexes_to_free); - if (event_data) - { - _vec_len (event_data) = 0; - } - } - - return 0; -} - -/* *INDENT-OFF* */ -VLIB_REGISTER_NODE (ip4_reass_expire_node) = { - .function = ip4_reass_walk_expired, - .type = VLIB_NODE_TYPE_PROCESS, - .name = "ip4-reassembly-expire-walk", - .format_trace = format_ip4_reass_trace, - .n_errors = ARRAY_LEN (ip4_reassembly_error_strings), - .error_strings = ip4_reassembly_error_strings, - -}; -/* *INDENT-ON* */ - -static u8 * -format_ip4_reass_key (u8 * s, va_list * args) -{ - ip4_reass_key_t *key = va_arg (*args, ip4_reass_key_t *); - s = format (s, "xx_id: %u, src: %U, dst: %U, frag_id: %u, proto: %u", - key->xx_id, format_ip4_address, &key->src, format_ip4_address, - &key->dst, clib_net_to_host_u16 (key->frag_id), key->proto); - return s; -} - -static u8 * -format_ip4_reass (u8 * s, va_list * args) -{ - vlib_main_t *vm = va_arg (*args, vlib_main_t *); - ip4_reass_t *reass = va_arg (*args, ip4_reass_t *); - - s = format (s, "ID: %lu, key: %U\n first_bi: %u, data_len: %u, " - "last_packet_octet: %u, trace_op_counter: %u\n", - reass->id, format_ip4_reass_key, &reass->key, reass->first_bi, - reass->data_len, reass->last_packet_octet, - reass->trace_op_counter); - u32 bi = reass->first_bi; - u32 counter = 0; - while (~0 != bi) - { - vlib_buffer_t *b = vlib_get_buffer (vm, bi); - vnet_buffer_opaque_t *vnb = vnet_buffer (b); - s = format (s, " #%03u: range: [%u, %u], bi: %u, off: %d, len: %u, " - "fragment[%u, %u]\n", - counter, vnb->ip.reass.range_first, - vnb->ip.reass.range_last, bi, - ip4_reass_buffer_get_data_offset (b), - ip4_reass_buffer_get_data_len (b), - vnb->ip.reass.fragment_first, vnb->ip.reass.fragment_last); - if (b->flags & VLIB_BUFFER_NEXT_PRESENT) - { - bi = b->next_buffer; - } - else - { - bi = ~0; - } - } - return s; -} - -static clib_error_t * -show_ip4_reass (vlib_main_t * vm, - unformat_input_t * input, - CLIB_UNUSED (vlib_cli_command_t * lmd)) -{ - ip4_reass_main_t *rm = &ip4_reass_main; - - vlib_cli_output (vm, "---------------------"); - vlib_cli_output (vm, "IP4 reassembly status"); - vlib_cli_output (vm, "---------------------"); - bool details = false; - if (unformat (input, "details")) - { - details = true; - } - - u32 sum_reass_n = 0; - ip4_reass_t *reass; - uword thread_index; - const uword nthreads = vlib_num_workers () + 1; - for (thread_index = 0; thread_index < nthreads; ++thread_index) - { - ip4_reass_per_thread_t *rt = &rm->per_thread_data[thread_index]; - clib_spinlock_lock (&rt->lock); - if (details) - { - /* *INDENT-OFF* */ - pool_foreach (reass, rt->pool, { - vlib_cli_output (vm, "%U", format_ip4_reass, vm, reass); - }); - /* *INDENT-ON* */ - } - sum_reass_n += rt->reass_n; - clib_spinlock_unlock (&rt->lock); - } - vlib_cli_output (vm, "---------------------"); - vlib_cli_output (vm, "Current IP4 reassemblies count: %lu\n", - (long unsigned) sum_reass_n); - vlib_cli_output (vm, - "Maximum configured concurrent IP4 reassemblies per worker-thread: %lu\n", - (long unsigned) rm->max_reass_n); - return 0; -} - -/* *INDENT-OFF* */ -VLIB_CLI_COMMAND (show_ip4_reassembly_cmd, static) = { - .path = "show ip4-reassembly", - .short_help = "show ip4-reassembly [details]", - .function = show_ip4_reass, -}; -/* *INDENT-ON* */ - -#ifndef CLIB_MARCH_VARIANT -vnet_api_error_t -ip4_reass_enable_disable (u32 sw_if_index, u8 enable_disable) -{ - return vnet_feature_enable_disable ("ip4-unicast", - "ip4-reassembly-feature", sw_if_index, - enable_disable, 0, 0); -} -#endif /* CLIB_MARCH_VARIANT */ - - -#define foreach_ip4_reassembly_handoff_error \ -_(CONGESTION_DROP, "congestion drop") - - -typedef enum -{ -#define _(sym,str) IP4_REASSEMBLY_HANDOFF_ERROR_##sym, - foreach_ip4_reassembly_handoff_error -#undef _ - IP4_REASSEMBLY_HANDOFF_N_ERROR, -} ip4_reassembly_handoff_error_t; - -static char *ip4_reassembly_handoff_error_strings[] = { -#define _(sym,string) string, - foreach_ip4_reassembly_handoff_error -#undef _ -}; - -typedef struct -{ - u32 next_worker_index; -} ip4_reassembly_handoff_trace_t; - -static u8 * -format_ip4_reassembly_handoff_trace (u8 * s, va_list * args) -{ - CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *); - CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *); - ip4_reassembly_handoff_trace_t *t = - va_arg (*args, ip4_reassembly_handoff_trace_t *); - - s = - format (s, "ip4-reassembly-handoff: next-worker %d", - t->next_worker_index); - - return s; -} - -always_inline uword -ip4_reassembly_handoff_node_inline (vlib_main_t * vm, - vlib_node_runtime_t * node, - vlib_frame_t * frame, bool is_feature) -{ - ip4_reass_main_t *rm = &ip4_reass_main; - - vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b; - u32 n_enq, n_left_from, *from; - u16 thread_indices[VLIB_FRAME_SIZE], *ti; - u32 fq_index; - - from = vlib_frame_vector_args (frame); - n_left_from = frame->n_vectors; - vlib_get_buffers (vm, from, bufs, n_left_from); - - b = bufs; - ti = thread_indices; - - fq_index = (is_feature) ? rm->fq_feature_index : rm->fq_index; - - while (n_left_from > 0) - { - ti[0] = - (is_feature) ? vnet_buffer (b[0])->ip. - reass.owner_feature_thread_index : vnet_buffer (b[0])->ip. - reass.owner_thread_index; - - if (PREDICT_FALSE - ((node->flags & VLIB_NODE_FLAG_TRACE) - && (b[0]->flags & VLIB_BUFFER_IS_TRACED))) - { - ip4_reassembly_handoff_trace_t *t = - vlib_add_trace (vm, node, b[0], sizeof (*t)); - t->next_worker_index = ti[0]; - } - - n_left_from -= 1; - ti += 1; - b += 1; - } - n_enq = - vlib_buffer_enqueue_to_thread (vm, fq_index, from, thread_indices, - frame->n_vectors, 1); - - if (n_enq < frame->n_vectors) - vlib_node_increment_counter (vm, node->node_index, - IP4_REASSEMBLY_HANDOFF_ERROR_CONGESTION_DROP, - frame->n_vectors - n_enq); - return frame->n_vectors; -} - -VLIB_NODE_FN (ip4_reassembly_handoff_node) (vlib_main_t * vm, - vlib_node_runtime_t * node, - vlib_frame_t * frame) -{ - return ip4_reassembly_handoff_node_inline (vm, node, frame, - false /* is_feature */ ); -} - - -/* *INDENT-OFF* */ -VLIB_REGISTER_NODE (ip4_reassembly_handoff_node) = { - .name = "ip4-reassembly-handoff", - .vector_size = sizeof (u32), - .n_errors = ARRAY_LEN(ip4_reassembly_handoff_error_strings), - .error_strings = ip4_reassembly_handoff_error_strings, - .format_trace = format_ip4_reassembly_handoff_trace, - - .n_next_nodes = 1, - - .next_nodes = { - [0] = "error-drop", - }, -}; -/* *INDENT-ON* */ - - -/* *INDENT-OFF* */ -VLIB_NODE_FN (ip4_reassembly_feature_handoff_node) (vlib_main_t * vm, - vlib_node_runtime_t * - node, - vlib_frame_t * frame) -{ - return ip4_reassembly_handoff_node_inline (vm, node, frame, - true /* is_feature */ ); -} -/* *INDENT-ON* */ - - -/* *INDENT-OFF* */ -VLIB_REGISTER_NODE (ip4_reassembly_feature_handoff_node) = { - .name = "ip4-reass-feature-hoff", - .vector_size = sizeof (u32), - .n_errors = ARRAY_LEN(ip4_reassembly_handoff_error_strings), - .error_strings = ip4_reassembly_handoff_error_strings, - .format_trace = format_ip4_reassembly_handoff_trace, - - .n_next_nodes = 1, - - .next_nodes = { - [0] = "error-drop", - }, -}; -/* *INDENT-ON* */ - -/* - * fd.io coding-style-patch-verification: ON - * - * Local Variables: - * eval: (c-set-style "gnu") - * End: - */ diff --git a/src/vnet/ip/ip4_reassembly.h b/src/vnet/ip/ip4_reassembly.h deleted file mode 100644 index 4ceb0ab2409..00000000000 --- a/src/vnet/ip/ip4_reassembly.h +++ /dev/null @@ -1,54 +0,0 @@ -/* - * Copyright (c) 2017 Cisco and/or its affiliates. - * Licensed under the Apache License, Version 2.0 (the "License"); - * you may not use this file except in compliance with the License. - * You may obtain a copy of the License at: - * - * http://www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, software - * distributed under the License is distributed on an "AS IS" BASIS, - * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - * See the License for the specific language governing permissions and - * limitations under the License. - */ - -/** - * @file - * @brief IPv4 Reassembly. - * - * This file contains the source code for IPv4 reassembly. - */ - -#ifndef __included_ip4_reassembly_h__ -#define __included_ip4_reassembly_h__ - -#include -#include - -/** - * @brief set ip4 reassembly configuration - */ -vnet_api_error_t ip4_reass_set (u32 timeout_ms, u32 max_reassemblies, - u32 max_reassembly_length, - u32 expire_walk_interval_ms); - -/** - * @brief get ip4 reassembly configuration - */ -vnet_api_error_t ip4_reass_get (u32 * timeout_ms, u32 * max_reassemblies, - u32 * max_reassembly_length, - u32 * expire_walk_interval_ms); - -vnet_api_error_t ip4_reass_enable_disable (u32 sw_if_index, - u8 enable_disable); - -#endif /* __included_ip4_reassembly_h */ - -/* - * fd.io coding-style-patch-verification: ON - * - * Local Variables: - * eval: (c-set-style "gnu") - * End: - */ diff --git a/src/vnet/ip/ip6_forward.c b/src/vnet/ip/ip6_forward.c index 067db77c412..eb6c89b39d7 100644 --- a/src/vnet/ip/ip6_forward.c +++ b/src/vnet/ip/ip6_forward.c @@ -1517,7 +1517,7 @@ VLIB_REGISTER_NODE (ip6_local_node) = [IP_LOCAL_NEXT_PUNT] = "ip6-punt", [IP_LOCAL_NEXT_UDP_LOOKUP] = "ip6-udp-lookup", [IP_LOCAL_NEXT_ICMP] = "ip6-icmp-input", - [IP_LOCAL_NEXT_REASSEMBLY] = "ip6-reassembly", + [IP_LOCAL_NEXT_REASSEMBLY] = "ip6-full-reassembly", }, }; /* *INDENT-ON* */ diff --git a/src/vnet/ip/ip6_reassembly.c b/src/vnet/ip/ip6_reassembly.c deleted file mode 100644 index 4f27304ca94..00000000000 --- a/src/vnet/ip/ip6_reassembly.c +++ /dev/null @@ -1,1795 +0,0 @@ -/* - * Copyright (c) 2017 Cisco and/or its affiliates. - * Licensed under the Apache License, Version 2.0 (the "License"); - * you may not use this file except in compliance with the License. - * You may obtain a copy of the License at: - * - * http://www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, software - * distributed under the License is distributed on an "AS IS" BASIS, - * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - * See the License for the specific language governing permissions and - * limitations under the License. - */ - -/** - * @file - * @brief IPv6 Reassembly. - * - * This file contains the source code for IPv6 reassembly. - */ - -#include -#include -#include -#include -#include - -#define MSEC_PER_SEC 1000 -#define IP6_REASS_TIMEOUT_DEFAULT_MS 100 -#define IP6_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS 10000 // 10 seconds default -#define IP6_REASS_MAX_REASSEMBLIES_DEFAULT 1024 -#define IP6_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT 3 -#define IP6_REASS_HT_LOAD_FACTOR (0.75) - -typedef enum -{ - IP6_REASS_RC_OK, - IP6_REASS_RC_INTERNAL_ERROR, - IP6_REASS_RC_TOO_MANY_FRAGMENTS, - IP6_REASS_RC_NO_BUF, - IP6_REASS_RC_HANDOFF, -} ip6_reass_rc_t; - -typedef struct -{ - union - { - struct - { - ip6_address_t src; - ip6_address_t dst; - u32 xx_id; - u32 frag_id; - u8 unused[7]; - u8 proto; - }; - u64 as_u64[6]; - }; -} ip6_reass_key_t; - -typedef union -{ - struct - { - u32 reass_index; - u32 memory_owner_thread_index; - }; - u64 as_u64; -} ip6_reass_val_t; - -typedef union -{ - struct - { - ip6_reass_key_t k; - ip6_reass_val_t v; - }; - clib_bihash_kv_48_8_t kv; -} ip6_reass_kv_t; - - -always_inline u32 -ip6_reass_buffer_get_data_offset (vlib_buffer_t * b) -{ - vnet_buffer_opaque_t *vnb = vnet_buffer (b); - return vnb->ip.reass.range_first - vnb->ip.reass.fragment_first; -} - -always_inline u16 -ip6_reass_buffer_get_data_len (vlib_buffer_t * b) -{ - vnet_buffer_opaque_t *vnb = vnet_buffer (b); - return clib_min (vnb->ip.reass.range_last, vnb->ip.reass.fragment_last) - - (vnb->ip.reass.fragment_first + ip6_reass_buffer_get_data_offset (b)) + 1; -} - -typedef struct -{ - // hash table key - ip6_reass_key_t key; - // time when last packet was received - f64 last_heard; - // internal id of this reassembly - u64 id; - // buffer index of first buffer in this reassembly context - u32 first_bi; - // last octet of packet, ~0 until fragment without more_fragments arrives - u32 last_packet_octet; - // length of data collected so far - u32 data_len; - // trace operation counter - u32 trace_op_counter; - // next index - used by custom apps (~0 if not set) - u32 next_index; - // error next index - used by custom apps (~0 if not set) - u32 error_next_index; - // minimum fragment length for this reassembly - used to estimate MTU - u16 min_fragment_length; - // number of fragments for this reassembly - u32 fragments_n; - // thread owning memory for this context (whose pool contains this ctx) - u32 memory_owner_thread_index; - // thread which received fragment with offset 0 and which sends out the - // completed reassembly - u32 sendout_thread_index; -} ip6_reass_t; - -typedef struct -{ - ip6_reass_t *pool; - u32 reass_n; - u32 id_counter; - clib_spinlock_t lock; -} ip6_reass_per_thread_t; - -typedef struct -{ - // IPv6 config - u32 timeout_ms; - f64 timeout; - u32 expire_walk_interval_ms; - // maximum number of fragments in one reassembly - u32 max_reass_len; - // maximum number of reassemblies - u32 max_reass_n; - - // IPv6 runtime - clib_bihash_48_8_t hash; - - // per-thread data - ip6_reass_per_thread_t *per_thread_data; - - // convenience - vlib_main_t *vlib_main; - - // node index of ip6-drop node - u32 ip6_drop_idx; - u32 ip6_icmp_error_idx; - u32 ip6_reass_expire_node_idx; - - /** Worker handoff */ - u32 fq_index; - u32 fq_feature_index; - -} ip6_reass_main_t; - -extern ip6_reass_main_t ip6_reass_main; - -#ifndef CLIB_MARCH_VARIANT -ip6_reass_main_t ip6_reass_main; -#endif /* CLIB_MARCH_VARIANT */ - -typedef enum -{ - IP6_REASSEMBLY_NEXT_INPUT, - IP6_REASSEMBLY_NEXT_DROP, - IP6_REASSEMBLY_NEXT_ICMP_ERROR, - IP6_REASSEMBLY_NEXT_HANDOFF, - IP6_REASSEMBLY_N_NEXT, -} ip6_reass_next_t; - -typedef enum -{ - RANGE_NEW, - RANGE_OVERLAP, - ICMP_ERROR_RT_EXCEEDED, - ICMP_ERROR_FL_TOO_BIG, - ICMP_ERROR_FL_NOT_MULT_8, - FINALIZE, - HANDOFF, -} ip6_reass_trace_operation_e; - -typedef struct -{ - u16 range_first; - u16 range_last; - u32 range_bi; - i32 data_offset; - u32 data_len; - u32 first_bi; -} ip6_reass_range_trace_t; - -typedef struct -{ - ip6_reass_trace_operation_e action; - u32 reass_id; - ip6_reass_range_trace_t trace_range; - u32 op_id; - u32 fragment_first; - u32 fragment_last; - u32 total_data_len; - u32 thread_id; - u32 thread_id_to; -} ip6_reass_trace_t; - -static void -ip6_reass_trace_details (vlib_main_t * vm, u32 bi, - ip6_reass_range_trace_t * trace) -{ - vlib_buffer_t *b = vlib_get_buffer (vm, bi); - vnet_buffer_opaque_t *vnb = vnet_buffer (b); - trace->range_first = vnb->ip.reass.range_first; - trace->range_last = vnb->ip.reass.range_last; - trace->data_offset = ip6_reass_buffer_get_data_offset (b); - trace->data_len = ip6_reass_buffer_get_data_len (b); - trace->range_bi = bi; -} - -static u8 * -format_ip6_reass_range_trace (u8 * s, va_list * args) -{ - ip6_reass_range_trace_t *trace = va_arg (*args, ip6_reass_range_trace_t *); - s = format (s, "range: [%u, %u], off %d, len %u, bi %u", trace->range_first, - trace->range_last, trace->data_offset, trace->data_len, - trace->range_bi); - return s; -} - -static u8 * -format_ip6_reass_trace (u8 * s, va_list * args) -{ - CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *); - CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *); - ip6_reass_trace_t *t = va_arg (*args, ip6_reass_trace_t *); - u32 indent = 0; - if (~0 != t->reass_id) - { - s = format (s, "reass id: %u, op id: %u ", t->reass_id, t->op_id); - indent = format_get_indent (s); - s = format (s, "first bi: %u, data len: %u, ip/fragment[%u, %u]", - t->trace_range.first_bi, t->total_data_len, - t->fragment_first, t->fragment_last); - } - switch (t->action) - { - case RANGE_NEW: - s = format (s, "\n%Unew %U", format_white_space, indent, - format_ip6_reass_range_trace, &t->trace_range); - break; - case RANGE_OVERLAP: - s = format (s, "\n%Uoverlap %U", format_white_space, indent, - format_ip6_reass_range_trace, &t->trace_range); - break; - case ICMP_ERROR_FL_TOO_BIG: - s = format (s, "\n%Uicmp-error - frag_len > 65535 %U", - format_white_space, indent, format_ip6_reass_range_trace, - &t->trace_range); - break; - case ICMP_ERROR_FL_NOT_MULT_8: - s = format (s, "\n%Uicmp-error - frag_len mod 8 != 0 %U", - format_white_space, indent, format_ip6_reass_range_trace, - &t->trace_range); - break; - case ICMP_ERROR_RT_EXCEEDED: - s = format (s, "\n%Uicmp-error - reassembly time exceeded", - format_white_space, indent); - break; - case FINALIZE: - s = format (s, "\n%Ufinalize reassembly", format_white_space, indent); - break; - case HANDOFF: - s = - format (s, "handoff from thread #%u to thread #%u", t->thread_id, - t->thread_id_to); - break; - } - return s; -} - -static void -ip6_reass_add_trace (vlib_main_t * vm, vlib_node_runtime_t * node, - ip6_reass_main_t * rm, u32 reass_id, u32 op_id, - u32 bi, u32 first_bi, u32 data_len, - ip6_reass_trace_operation_e action, u32 thread_id_to) -{ - vlib_buffer_t *b = vlib_get_buffer (vm, bi); - vnet_buffer_opaque_t *vnb = vnet_buffer (b); - ip6_reass_trace_t *t = vlib_add_trace (vm, node, b, sizeof (t[0])); - t->reass_id = reass_id; - t->action = action; - ip6_reass_trace_details (vm, bi, &t->trace_range); - t->op_id = op_id; - t->thread_id = vm->thread_index; - t->thread_id_to = thread_id_to; - t->fragment_first = vnb->ip.reass.fragment_first; - t->fragment_last = vnb->ip.reass.fragment_last; - t->trace_range.first_bi = first_bi; - t->total_data_len = data_len; -#if 0 - static u8 *s = NULL; - s = format (s, "%U", format_ip6_reass_trace, NULL, NULL, t); - printf ("%.*s\n", vec_len (s), s); - fflush (stdout); - vec_reset_length (s); -#endif -} - -always_inline void -ip6_reass_free_ctx (ip6_reass_per_thread_t * rt, ip6_reass_t * reass) -{ - pool_put (rt->pool, reass); - --rt->reass_n; -} - -always_inline void -ip6_reass_free (ip6_reass_main_t * rm, ip6_reass_per_thread_t * rt, - ip6_reass_t * reass) -{ - clib_bihash_kv_48_8_t kv; - kv.key[0] = reass->key.as_u64[0]; - kv.key[1] = reass->key.as_u64[1]; - kv.key[2] = reass->key.as_u64[2]; - kv.key[3] = reass->key.as_u64[3]; - kv.key[4] = reass->key.as_u64[4]; - kv.key[5] = reass->key.as_u64[5]; - clib_bihash_add_del_48_8 (&rm->hash, &kv, 0); - ip6_reass_free_ctx (rt, reass); -} - -always_inline void -ip6_reass_drop_all (vlib_main_t * vm, vlib_node_runtime_t * node, - ip6_reass_main_t * rm, ip6_reass_t * reass) -{ - u32 range_bi = reass->first_bi; - vlib_buffer_t *range_b; - vnet_buffer_opaque_t *range_vnb; - u32 *to_free = NULL; - while (~0 != range_bi) - { - range_b = vlib_get_buffer (vm, range_bi); - range_vnb = vnet_buffer (range_b); - u32 bi = range_bi; - while (~0 != bi) - { - vec_add1 (to_free, bi); - vlib_buffer_t *b = vlib_get_buffer (vm, bi); - if (b->flags & VLIB_BUFFER_NEXT_PRESENT) - { - bi = b->next_buffer; - b->flags &= ~VLIB_BUFFER_NEXT_PRESENT; - } - else - { - bi = ~0; - } - } - range_bi = range_vnb->ip.reass.next_range_bi; - } - /* send to next_error_index */ - if (~0 != reass->error_next_index) - { - u32 n_left_to_next, *to_next, next_index; - - next_index = reass->error_next_index; - u32 bi = ~0; - - while (vec_len (to_free) > 0) - { - vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); - - while (vec_len (to_free) > 0 && n_left_to_next > 0) - { - bi = vec_pop (to_free); - - if (~0 != bi) - { - to_next[0] = bi; - to_next += 1; - n_left_to_next -= 1; - } - } - vlib_put_next_frame (vm, node, next_index, n_left_to_next); - } - } - else - { - vlib_buffer_free (vm, to_free, vec_len (to_free)); - } - vec_free (to_free); -} - -always_inline void -ip6_reass_on_timeout (vlib_main_t * vm, vlib_node_runtime_t * node, - ip6_reass_main_t * rm, ip6_reass_t * reass, - u32 * icmp_bi) -{ - if (~0 == reass->first_bi) - { - return; - } - if (~0 == reass->next_index) // custom apps don't want icmp - { - vlib_buffer_t *b = vlib_get_buffer (vm, reass->first_bi); - if (0 == vnet_buffer (b)->ip.reass.fragment_first) - { - *icmp_bi = reass->first_bi; - if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED)) - { - ip6_reass_add_trace (vm, node, rm, reass->id, - reass->trace_op_counter, reass->first_bi, - reass->first_bi, reass->data_len, - ICMP_ERROR_RT_EXCEEDED, ~0); - ++reass->trace_op_counter; - } - // fragment with offset zero received - send icmp message back - if (b->flags & VLIB_BUFFER_NEXT_PRESENT) - { - // separate first buffer from chain and steer it towards icmp node - b->flags &= ~VLIB_BUFFER_NEXT_PRESENT; - reass->first_bi = b->next_buffer; - } - else - { - reass->first_bi = vnet_buffer (b)->ip.reass.next_range_bi; - } - icmp6_error_set_vnet_buffer (b, ICMP6_time_exceeded, - ICMP6_time_exceeded_fragment_reassembly_time_exceeded, - 0); - } - } - ip6_reass_drop_all (vm, node, rm, reass); -} - -always_inline ip6_reass_t * -ip6_reass_find_or_create (vlib_main_t * vm, vlib_node_runtime_t * node, - ip6_reass_main_t * rm, ip6_reass_per_thread_t * rt, - ip6_reass_kv_t * kv, u32 * icmp_bi, u8 * do_handoff) -{ - ip6_reass_t *reass; - f64 now; - -again: - - reass = NULL; - now = vlib_time_now (vm); - - if (!clib_bihash_search_48_8 - (&rm->hash, (clib_bihash_kv_48_8_t *) kv, (clib_bihash_kv_48_8_t *) kv)) - { - reass = - pool_elt_at_index (rm->per_thread_data - [kv->v.memory_owner_thread_index].pool, - kv->v.reass_index); - if (vm->thread_index != kv->v.memory_owner_thread_index) - { - *do_handoff = 1; - return reass; - } - - if (now > reass->last_heard + rm->timeout) - { - ip6_reass_on_timeout (vm, node, rm, reass, icmp_bi); - ip6_reass_free (rm, rt, reass); - reass = NULL; - } - } - - if (reass) - { - reass->last_heard = now; - return reass; - } - - if (rt->reass_n >= rm->max_reass_n) - { - reass = NULL; - return reass; - } - else - { - pool_get (rt->pool, reass); - clib_memset (reass, 0, sizeof (*reass)); - reass->id = ((u64) vm->thread_index * 1000000000) + rt->id_counter; - ++rt->id_counter; - reass->first_bi = ~0; - reass->last_packet_octet = ~0; - reass->data_len = 0; - reass->next_index = ~0; - reass->error_next_index = ~0; - ++rt->reass_n; - } - - reass->key.as_u64[0] = ((clib_bihash_kv_48_8_t *) kv)->key[0]; - reass->key.as_u64[1] = ((clib_bihash_kv_48_8_t *) kv)->key[1]; - reass->key.as_u64[2] = ((clib_bihash_kv_48_8_t *) kv)->key[2]; - reass->key.as_u64[3] = ((clib_bihash_kv_48_8_t *) kv)->key[3]; - reass->key.as_u64[4] = ((clib_bihash_kv_48_8_t *) kv)->key[4]; - reass->key.as_u64[5] = ((clib_bihash_kv_48_8_t *) kv)->key[5]; - kv->v.reass_index = (reass - rt->pool); - kv->v.memory_owner_thread_index = vm->thread_index; - reass->last_heard = now; - - int rv = - clib_bihash_add_del_48_8 (&rm->hash, (clib_bihash_kv_48_8_t *) kv, 2); - if (rv) - { - ip6_reass_free_ctx (rt, reass); - reass = NULL; - // if other worker created a context already work with the other copy - if (-2 == rv) - goto again; - } - - return reass; -} - -always_inline ip6_reass_rc_t -ip6_reass_finalize (vlib_main_t * vm, vlib_node_runtime_t * node, - ip6_reass_main_t * rm, ip6_reass_per_thread_t * rt, - ip6_reass_t * reass, u32 * bi0, u32 * next0, u32 * error0, - bool is_custom_app) -{ - *bi0 = reass->first_bi; - *error0 = IP6_ERROR_NONE; - ip6_frag_hdr_t *frag_hdr; - vlib_buffer_t *last_b = NULL; - u32 sub_chain_bi = reass->first_bi; - u32 total_length = 0; - u32 buf_cnt = 0; - u32 dropped_cnt = 0; - u32 *vec_drop_compress = NULL; - ip6_reass_rc_t rv = IP6_REASS_RC_OK; - do - { - u32 tmp_bi = sub_chain_bi; - vlib_buffer_t *tmp = vlib_get_buffer (vm, tmp_bi); - vnet_buffer_opaque_t *vnb = vnet_buffer (tmp); - if (!(vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first) && - !(vnb->ip.reass.range_last > vnb->ip.reass.fragment_first)) - { - rv = IP6_REASS_RC_INTERNAL_ERROR; - goto free_buffers_and_return; - } - - u32 data_len = ip6_reass_buffer_get_data_len (tmp); - u32 trim_front = vnet_buffer (tmp)->ip.reass.ip6_frag_hdr_offset + - sizeof (*frag_hdr) + ip6_reass_buffer_get_data_offset (tmp); - u32 trim_end = - vlib_buffer_length_in_chain (vm, tmp) - trim_front - data_len; - if (tmp_bi == reass->first_bi) - { - /* first buffer - keep ip6 header */ - if (0 != ip6_reass_buffer_get_data_offset (tmp)) - { - rv = IP6_REASS_RC_INTERNAL_ERROR; - goto free_buffers_and_return; - } - trim_front = 0; - trim_end = vlib_buffer_length_in_chain (vm, tmp) - data_len - - (vnet_buffer (tmp)->ip.reass.ip6_frag_hdr_offset + - sizeof (*frag_hdr)); - if (!(vlib_buffer_length_in_chain (vm, tmp) - trim_end > 0)) - { - rv = IP6_REASS_RC_INTERNAL_ERROR; - goto free_buffers_and_return; - } - } - u32 keep_data = - vlib_buffer_length_in_chain (vm, tmp) - trim_front - trim_end; - while (1) - { - ++buf_cnt; - if (trim_front) - { - if (trim_front > tmp->current_length) - { - /* drop whole buffer */ - vec_add1 (vec_drop_compress, tmp_bi); - trim_front -= tmp->current_length; - if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT)) - { - rv = IP6_REASS_RC_INTERNAL_ERROR; - goto free_buffers_and_return; - } - tmp->flags &= ~VLIB_BUFFER_NEXT_PRESENT; - tmp_bi = tmp->next_buffer; - tmp = vlib_get_buffer (vm, tmp_bi); - continue; - } - else - { - vlib_buffer_advance (tmp, trim_front); - trim_front = 0; - } - } - if (keep_data) - { - if (last_b) - { - last_b->flags |= VLIB_BUFFER_NEXT_PRESENT; - last_b->next_buffer = tmp_bi; - } - last_b = tmp; - if (keep_data <= tmp->current_length) - { - tmp->current_length = keep_data; - keep_data = 0; - } - else - { - keep_data -= tmp->current_length; - if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT)) - { - rv = IP6_REASS_RC_INTERNAL_ERROR; - goto free_buffers_and_return; - } - } - total_length += tmp->current_length; - } - else - { - vec_add1 (vec_drop_compress, tmp_bi); - if (reass->first_bi == tmp_bi) - { - rv = IP6_REASS_RC_INTERNAL_ERROR; - goto free_buffers_and_return; - } - ++dropped_cnt; - } - if (tmp->flags & VLIB_BUFFER_NEXT_PRESENT) - { - tmp_bi = tmp->next_buffer; - tmp = vlib_get_buffer (vm, tmp->next_buffer); - } - else - { - break; - } - } - sub_chain_bi = - vnet_buffer (vlib_get_buffer (vm, sub_chain_bi))->ip. - reass.next_range_bi; - } - while (~0 != sub_chain_bi); - - if (!last_b) - { - rv = IP6_REASS_RC_INTERNAL_ERROR; - goto free_buffers_and_return; - } - last_b->flags &= ~VLIB_BUFFER_NEXT_PRESENT; - vlib_buffer_t *first_b = vlib_get_buffer (vm, reass->first_bi); - if (total_length < first_b->current_length) - { - rv = IP6_REASS_RC_INTERNAL_ERROR; - goto free_buffers_and_return; - } - total_length -= first_b->current_length; - first_b->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID; - first_b->total_length_not_including_first_buffer = total_length; - // drop fragment header - vnet_buffer_opaque_t *first_b_vnb = vnet_buffer (first_b); - ip6_header_t *ip = vlib_buffer_get_current (first_b); - u16 ip6_frag_hdr_offset = first_b_vnb->ip.reass.ip6_frag_hdr_offset; - ip6_ext_header_t *prev_hdr; - ip6_ext_header_find_t (ip, prev_hdr, frag_hdr, - IP_PROTOCOL_IPV6_FRAGMENTATION); - if (prev_hdr) - { - prev_hdr->next_hdr = frag_hdr->next_hdr; - } - else - { - ip->protocol = frag_hdr->next_hdr; - } - if (!((u8 *) frag_hdr - (u8 *) ip == ip6_frag_hdr_offset)) - { - rv = IP6_REASS_RC_INTERNAL_ERROR; - goto free_buffers_and_return; - } - memmove (frag_hdr, (u8 *) frag_hdr + sizeof (*frag_hdr), - first_b->current_length - ip6_frag_hdr_offset - - sizeof (ip6_frag_hdr_t)); - first_b->current_length -= sizeof (*frag_hdr); - ip->payload_length = - clib_host_to_net_u16 (total_length + first_b->current_length - - sizeof (*ip)); - if (!vlib_buffer_chain_linearize (vm, first_b)) - { - rv = IP6_REASS_RC_NO_BUF; - goto free_buffers_and_return; - } - first_b->flags &= ~VLIB_BUFFER_EXT_HDR_VALID; - if (PREDICT_FALSE (first_b->flags & VLIB_BUFFER_IS_TRACED)) - { - ip6_reass_add_trace (vm, node, rm, reass->id, reass->trace_op_counter, - reass->first_bi, reass->first_bi, reass->data_len, - FINALIZE, ~0); - ++reass->trace_op_counter; -#if 0 - // following code does a hexdump of packet fragments to stdout ... - do - { - u32 bi = reass->first_bi; - u8 *s = NULL; - while (~0 != bi) - { - vlib_buffer_t *b = vlib_get_buffer (vm, bi); - s = format (s, "%u: %U\n", bi, format_hexdump, - vlib_buffer_get_current (b), b->current_length); - if (b->flags & VLIB_BUFFER_NEXT_PRESENT) - { - bi = b->next_buffer; - } - else - { - break; - } - } - printf ("%.*s\n", vec_len (s), s); - fflush (stdout); - vec_free (s); - } - while (0); -#endif - } - if (!is_custom_app) - { - *next0 = IP6_REASSEMBLY_NEXT_INPUT; - } - else - { - *next0 = reass->next_index; - } - vnet_buffer (first_b)->ip.reass.estimated_mtu = reass->min_fragment_length; - ip6_reass_free (rm, rt, reass); - reass = NULL; -free_buffers_and_return: - vlib_buffer_free (vm, vec_drop_compress, vec_len (vec_drop_compress)); - vec_free (vec_drop_compress); - return rv; -} - -always_inline void -ip6_reass_insert_range_in_chain (vlib_main_t * vm, ip6_reass_main_t * rm, - ip6_reass_per_thread_t * rt, - ip6_reass_t * reass, u32 prev_range_bi, - u32 new_next_bi) -{ - - vlib_buffer_t *new_next_b = vlib_get_buffer (vm, new_next_bi); - vnet_buffer_opaque_t *new_next_vnb = vnet_buffer (new_next_b); - if (~0 != prev_range_bi) - { - vlib_buffer_t *prev_b = vlib_get_buffer (vm, prev_range_bi); - vnet_buffer_opaque_t *prev_vnb = vnet_buffer (prev_b); - new_next_vnb->ip.reass.next_range_bi = prev_vnb->ip.reass.next_range_bi; - prev_vnb->ip.reass.next_range_bi = new_next_bi; - } - else - { - if (~0 != reass->first_bi) - { - new_next_vnb->ip.reass.next_range_bi = reass->first_bi; - } - reass->first_bi = new_next_bi; - } - reass->data_len += ip6_reass_buffer_get_data_len (new_next_b); -} - -always_inline ip6_reass_rc_t -ip6_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node, - ip6_reass_main_t * rm, ip6_reass_per_thread_t * rt, - ip6_reass_t * reass, u32 * bi0, u32 * next0, u32 * error0, - ip6_frag_hdr_t * frag_hdr, bool is_custom_app, - u32 * handoff_thread_idx) -{ - int consumed = 0; - vlib_buffer_t *fb = vlib_get_buffer (vm, *bi0); - vnet_buffer_opaque_t *fvnb = vnet_buffer (fb); - if (is_custom_app) - { - reass->next_index = fvnb->ip.reass.next_index; // store next_index before it's overwritten - reass->error_next_index = fvnb->ip.reass.error_next_index; // store error_next_index before it is overwritten - } - - fvnb->ip.reass.ip6_frag_hdr_offset = - (u8 *) frag_hdr - (u8 *) vlib_buffer_get_current (fb); - ip6_header_t *fip = vlib_buffer_get_current (fb); - if (fb->current_length < sizeof (*fip) || - fvnb->ip.reass.ip6_frag_hdr_offset == 0 || - fvnb->ip.reass.ip6_frag_hdr_offset >= fb->current_length) - { - return IP6_REASS_RC_INTERNAL_ERROR; - } - - u32 fragment_first = fvnb->ip.reass.fragment_first = - ip6_frag_hdr_offset_bytes (frag_hdr); - u32 fragment_length = - vlib_buffer_length_in_chain (vm, fb) - - (fvnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr)); - u32 fragment_last = fvnb->ip.reass.fragment_last = - fragment_first + fragment_length - 1; - int more_fragments = ip6_frag_hdr_more (frag_hdr); - u32 candidate_range_bi = reass->first_bi; - u32 prev_range_bi = ~0; - fvnb->ip.reass.range_first = fragment_first; - fvnb->ip.reass.range_last = fragment_last; - fvnb->ip.reass.next_range_bi = ~0; - if (!more_fragments) - { - reass->last_packet_octet = fragment_last; - } - if (~0 == reass->first_bi) - { - // starting a new reassembly - ip6_reass_insert_range_in_chain (vm, rm, rt, reass, prev_range_bi, - *bi0); - reass->min_fragment_length = clib_net_to_host_u16 (fip->payload_length); - consumed = 1; - reass->fragments_n = 1; - goto check_if_done_maybe; - } - reass->min_fragment_length = - clib_min (clib_net_to_host_u16 (fip->payload_length), - fvnb->ip.reass.estimated_mtu); - while (~0 != candidate_range_bi) - { - vlib_buffer_t *candidate_b = vlib_get_buffer (vm, candidate_range_bi); - vnet_buffer_opaque_t *candidate_vnb = vnet_buffer (candidate_b); - if (fragment_first > candidate_vnb->ip.reass.range_last) - { - // this fragments starts after candidate range - prev_range_bi = candidate_range_bi; - candidate_range_bi = candidate_vnb->ip.reass.next_range_bi; - if (candidate_vnb->ip.reass.range_last < fragment_last && - ~0 == candidate_range_bi) - { - // special case - this fragment falls beyond all known ranges - ip6_reass_insert_range_in_chain (vm, rm, rt, reass, - prev_range_bi, *bi0); - consumed = 1; - break; - } - continue; - } - if (fragment_last < candidate_vnb->ip.reass.range_first) - { - // this fragment ends before candidate range without any overlap - ip6_reass_insert_range_in_chain (vm, rm, rt, reass, prev_range_bi, - *bi0); - consumed = 1; - } - else if (fragment_first == candidate_vnb->ip.reass.range_first && - fragment_last == candidate_vnb->ip.reass.range_last) - { - // duplicate fragment - ignore - } - else - { - // overlapping fragment - not allowed by RFC 8200 - ip6_reass_drop_all (vm, node, rm, reass); - ip6_reass_free (rm, rt, reass); - if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED)) - { - ip6_reass_add_trace (vm, node, rm, reass->id, - reass->trace_op_counter, *bi0, - reass->first_bi, reass->data_len, - RANGE_OVERLAP, ~0); - ++reass->trace_op_counter; - } - *next0 = IP6_REASSEMBLY_NEXT_DROP; - *error0 = IP6_ERROR_REASS_OVERLAPPING_FRAGMENT; - return IP6_REASS_RC_OK; - } - break; - } - ++reass->fragments_n; -check_if_done_maybe: - if (consumed) - { - if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED)) - { - ip6_reass_add_trace (vm, node, rm, reass->id, - reass->trace_op_counter, *bi0, reass->first_bi, - reass->data_len, RANGE_NEW, ~0); - ++reass->trace_op_counter; - } - } - if (~0 != reass->last_packet_octet && - reass->data_len == reass->last_packet_octet + 1) - { - *handoff_thread_idx = reass->sendout_thread_index; - ip6_reass_rc_t rc = - ip6_reass_finalize (vm, node, rm, rt, reass, bi0, next0, error0, - is_custom_app); - if (IP6_REASS_RC_OK == rc - && reass->memory_owner_thread_index != reass->sendout_thread_index) - { - return IP6_REASS_RC_HANDOFF; - } - return rc; - } - else - { - if (consumed) - { - *bi0 = ~0; - if (reass->fragments_n > rm->max_reass_len) - { - return IP6_REASS_RC_TOO_MANY_FRAGMENTS; - } - } - else - { - *next0 = IP6_REASSEMBLY_NEXT_DROP; - *error0 = IP6_ERROR_REASS_DUPLICATE_FRAGMENT; - } - } - return IP6_REASS_RC_OK; -} - -always_inline bool -ip6_reass_verify_upper_layer_present (vlib_node_runtime_t * node, - vlib_buffer_t * b, - ip6_frag_hdr_t * frag_hdr) -{ - ip6_ext_header_t *tmp = (ip6_ext_header_t *) frag_hdr; - while (ip6_ext_hdr (tmp->next_hdr)) - { - tmp = ip6_ext_next_header (tmp); - } - if (IP_PROTOCOL_IP6_NONXT == tmp->next_hdr) - { - icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem, - ICMP6_parameter_problem_first_fragment_has_incomplete_header_chain, - 0); - b->error = node->errors[IP6_ERROR_REASS_MISSING_UPPER]; - - return false; - } - return true; -} - -always_inline bool -ip6_reass_verify_fragment_multiple_8 (vlib_main_t * vm, - vlib_node_runtime_t * node, - vlib_buffer_t * b, - ip6_frag_hdr_t * frag_hdr) -{ - vnet_buffer_opaque_t *vnb = vnet_buffer (b); - ip6_header_t *ip = vlib_buffer_get_current (b); - int more_fragments = ip6_frag_hdr_more (frag_hdr); - u32 fragment_length = - vlib_buffer_length_in_chain (vm, b) - - (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr)); - if (more_fragments && 0 != fragment_length % 8) - { - icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem, - ICMP6_parameter_problem_erroneous_header_field, - (u8 *) & ip->payload_length - (u8 *) ip); - return false; - } - return true; -} - -always_inline bool -ip6_reass_verify_packet_size_lt_64k (vlib_main_t * vm, - vlib_node_runtime_t * node, - vlib_buffer_t * b, - ip6_frag_hdr_t * frag_hdr) -{ - vnet_buffer_opaque_t *vnb = vnet_buffer (b); - u32 fragment_first = ip6_frag_hdr_offset_bytes (frag_hdr); - u32 fragment_length = - vlib_buffer_length_in_chain (vm, b) - - (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr)); - if (fragment_first + fragment_length > 65535) - { - ip6_header_t *ip0 = vlib_buffer_get_current (b); - icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem, - ICMP6_parameter_problem_erroneous_header_field, - (u8 *) & frag_hdr->fragment_offset_and_more - - (u8 *) ip0); - return false; - } - return true; -} - -always_inline uword -ip6_reassembly_inline (vlib_main_t * vm, vlib_node_runtime_t * node, - vlib_frame_t * frame, bool is_feature, - bool is_custom_app) -{ - u32 *from = vlib_frame_vector_args (frame); - u32 n_left_from, n_left_to_next, *to_next, next_index; - ip6_reass_main_t *rm = &ip6_reass_main; - ip6_reass_per_thread_t *rt = &rm->per_thread_data[vm->thread_index]; - clib_spinlock_lock (&rt->lock); - - n_left_from = frame->n_vectors; - next_index = node->cached_next_index; - while (n_left_from > 0) - { - vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); - - while (n_left_from > 0 && n_left_to_next > 0) - { - u32 bi0; - vlib_buffer_t *b0; - u32 next0 = IP6_REASSEMBLY_NEXT_DROP; - u32 error0 = IP6_ERROR_NONE; - u32 icmp_bi = ~0; - - bi0 = from[0]; - b0 = vlib_get_buffer (vm, bi0); - - ip6_header_t *ip0 = vlib_buffer_get_current (b0); - ip6_frag_hdr_t *frag_hdr = NULL; - ip6_ext_header_t *prev_hdr; - if (ip6_ext_hdr (ip0->protocol)) - { - ip6_ext_header_find_t (ip0, prev_hdr, frag_hdr, - IP_PROTOCOL_IPV6_FRAGMENTATION); - } - if (!frag_hdr) - { - // this is a regular packet - no fragmentation - next0 = IP6_REASSEMBLY_NEXT_INPUT; - goto skip_reass; - } - if (0 == ip6_frag_hdr_offset (frag_hdr)) - { - // first fragment - verify upper-layer is present - if (!ip6_reass_verify_upper_layer_present (node, b0, frag_hdr)) - { - next0 = IP6_REASSEMBLY_NEXT_ICMP_ERROR; - goto skip_reass; - } - } - if (!ip6_reass_verify_fragment_multiple_8 (vm, node, b0, frag_hdr) - || !ip6_reass_verify_packet_size_lt_64k (vm, node, b0, - frag_hdr)) - { - next0 = IP6_REASSEMBLY_NEXT_ICMP_ERROR; - goto skip_reass; - } - vnet_buffer (b0)->ip.reass.ip6_frag_hdr_offset = - (u8 *) frag_hdr - (u8 *) ip0; - - ip6_reass_kv_t kv; - u8 do_handoff = 0; - - kv.k.as_u64[0] = ip0->src_address.as_u64[0]; - kv.k.as_u64[1] = ip0->src_address.as_u64[1]; - kv.k.as_u64[2] = ip0->dst_address.as_u64[0]; - kv.k.as_u64[3] = ip0->dst_address.as_u64[1]; - kv.k.as_u64[4] = - ((u64) vec_elt (ip6_main.fib_index_by_sw_if_index, - vnet_buffer (b0)->sw_if_index[VLIB_RX])) << 32 | - (u64) frag_hdr->identification; - kv.k.as_u64[5] = ip0->protocol; - - ip6_reass_t *reass = - ip6_reass_find_or_create (vm, node, rm, rt, &kv, &icmp_bi, - &do_handoff); - - if (reass) - { - const u32 fragment_first = ip6_frag_hdr_offset (frag_hdr); - if (0 == fragment_first) - { - reass->sendout_thread_index = vm->thread_index; - } - } - if (PREDICT_FALSE (do_handoff)) - { - next0 = IP6_REASSEMBLY_NEXT_HANDOFF; - if (is_feature) - vnet_buffer (b0)->ip.reass.owner_feature_thread_index = - kv.v.memory_owner_thread_index; - else - vnet_buffer (b0)->ip.reass.owner_thread_index = - kv.v.memory_owner_thread_index; - } - else if (reass) - { - u32 handoff_thread_idx; - switch (ip6_reass_update (vm, node, rm, rt, reass, &bi0, &next0, - &error0, frag_hdr, is_custom_app, - &handoff_thread_idx)) - { - case IP6_REASS_RC_OK: - /* nothing to do here */ - break; - case IP6_REASS_RC_HANDOFF: - next0 = IP6_REASSEMBLY_NEXT_HANDOFF; - b0 = vlib_get_buffer (vm, bi0); - if (is_feature) - vnet_buffer (b0)->ip.reass.owner_feature_thread_index = - handoff_thread_idx; - else - vnet_buffer (b0)->ip.reass.owner_thread_index = - handoff_thread_idx; - break; - case IP6_REASS_RC_TOO_MANY_FRAGMENTS: - vlib_node_increment_counter (vm, node->node_index, - IP6_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG, - 1); - ip6_reass_drop_all (vm, node, rm, reass); - ip6_reass_free (rm, rt, reass); - goto next_packet; - break; - case IP6_REASS_RC_NO_BUF: - vlib_node_increment_counter (vm, node->node_index, - IP6_ERROR_REASS_NO_BUF, 1); - ip6_reass_drop_all (vm, node, rm, reass); - ip6_reass_free (rm, rt, reass); - goto next_packet; - break; - case IP6_REASS_RC_INTERNAL_ERROR: - /* drop everything and start with a clean slate */ - vlib_node_increment_counter (vm, node->node_index, - IP6_ERROR_REASS_INTERNAL_ERROR, - 1); - ip6_reass_drop_all (vm, node, rm, reass); - ip6_reass_free (rm, rt, reass); - goto next_packet; - break; - } - } - else - { - if (is_feature) - { - next0 = IP6_REASSEMBLY_NEXT_DROP; - } - else - { - vnet_buffer_opaque_t *fvnb = vnet_buffer (b0); - next0 = fvnb->ip.reass.error_next_index; - } - error0 = IP6_ERROR_REASS_LIMIT_REACHED; - } - - b0->error = node->errors[error0]; - - if (~0 != bi0) - { - skip_reass: - to_next[0] = bi0; - to_next += 1; - n_left_to_next -= 1; - if (next0 == IP6_REASSEMBLY_NEXT_HANDOFF) - { - if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) - { - if (is_feature) - ip6_reass_add_trace (vm, node, rm, ~0, - ~0, - bi0, ~0, ~0, HANDOFF, - vnet_buffer (b0)->ip. - reass.owner_feature_thread_index); - else - ip6_reass_add_trace (vm, node, rm, ~0, ~0, bi0, - ~0, ~0, HANDOFF, - vnet_buffer (b0)->ip. - reass.owner_thread_index); - } - } - else if (is_feature && IP6_ERROR_NONE == error0) - { - b0 = vlib_get_buffer (vm, bi0); - vnet_feature_next (&next0, b0); - } - vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, - n_left_to_next, bi0, next0); - } - - if (~0 != icmp_bi) - { - next0 = IP6_REASSEMBLY_NEXT_ICMP_ERROR; - to_next[0] = icmp_bi; - to_next += 1; - n_left_to_next -= 1; - vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, - n_left_to_next, icmp_bi, - next0); - } - next_packet: - from += 1; - n_left_from -= 1; - } - - vlib_put_next_frame (vm, node, next_index, n_left_to_next); - } - - clib_spinlock_unlock (&rt->lock); - return frame->n_vectors; -} - -static char *ip6_reassembly_error_strings[] = { -#define _(sym, string) string, - foreach_ip6_error -#undef _ -}; - -VLIB_NODE_FN (ip6_reass_node) (vlib_main_t * vm, vlib_node_runtime_t * node, - vlib_frame_t * frame) -{ - return ip6_reassembly_inline (vm, node, frame, false /* is_feature */ , - false /* is_custom_app */ ); -} - -/* *INDENT-OFF* */ -VLIB_REGISTER_NODE (ip6_reass_node) = { - .name = "ip6-reassembly", - .vector_size = sizeof (u32), - .format_trace = format_ip6_reass_trace, - .n_errors = ARRAY_LEN (ip6_reassembly_error_strings), - .error_strings = ip6_reassembly_error_strings, - .n_next_nodes = IP6_REASSEMBLY_N_NEXT, - .next_nodes = - { - [IP6_REASSEMBLY_NEXT_INPUT] = "ip6-input", - [IP6_REASSEMBLY_NEXT_DROP] = "ip6-drop", - [IP6_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error", - [IP6_REASSEMBLY_NEXT_HANDOFF] = "ip6-reassembly-handoff", - }, -}; -/* *INDENT-ON* */ - -VLIB_NODE_FN (ip6_reass_node_feature) (vlib_main_t * vm, - vlib_node_runtime_t * node, - vlib_frame_t * frame) -{ - return ip6_reassembly_inline (vm, node, frame, true /* is_feature */ , - false /* is_custom_app */ ); -} - -/* *INDENT-OFF* */ -VLIB_REGISTER_NODE (ip6_reass_node_feature) = { - .name = "ip6-reassembly-feature", - .vector_size = sizeof (u32), - .format_trace = format_ip6_reass_trace, - .n_errors = ARRAY_LEN (ip6_reassembly_error_strings), - .error_strings = ip6_reassembly_error_strings, - .n_next_nodes = IP6_REASSEMBLY_N_NEXT, - .next_nodes = - { - [IP6_REASSEMBLY_NEXT_INPUT] = "ip6-input", - [IP6_REASSEMBLY_NEXT_DROP] = "ip6-drop", - [IP6_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error", - [IP6_REASSEMBLY_NEXT_HANDOFF] = "ip6-reass-feature-hoff", - }, -}; -/* *INDENT-ON* */ - -/* *INDENT-OFF* */ -VNET_FEATURE_INIT (ip6_reassembly_feature, static) = { - .arc_name = "ip6-unicast", - .node_name = "ip6-reassembly-feature", - .runs_before = VNET_FEATURES ("ip6-lookup", - "ipsec6-input-feature"), - .runs_after = 0, -}; -/* *INDENT-ON* */ - -#ifndef CLIB_MARCH_VARIANT -static u32 -ip6_reass_get_nbuckets () -{ - ip6_reass_main_t *rm = &ip6_reass_main; - u32 nbuckets; - u8 i; - - nbuckets = (u32) (rm->max_reass_n / IP6_REASS_HT_LOAD_FACTOR); - - for (i = 0; i < 31; i++) - if ((1 << i) >= nbuckets) - break; - nbuckets = 1 << i; - - return nbuckets; -} -#endif /* CLIB_MARCH_VARIANT */ - -typedef enum -{ - IP6_EVENT_CONFIG_CHANGED = 1, -} ip6_reass_event_t; - -#ifndef CLIB_MARCH_VARIANT -typedef struct -{ - int failure; - clib_bihash_48_8_t *new_hash; -} ip6_rehash_cb_ctx; - -static void -ip6_rehash_cb (clib_bihash_kv_48_8_t * kv, void *_ctx) -{ - ip6_rehash_cb_ctx *ctx = _ctx; - if (clib_bihash_add_del_48_8 (ctx->new_hash, kv, 1)) - { - ctx->failure = 1; - } -} - -static void -ip6_reass_set_params (u32 timeout_ms, u32 max_reassemblies, - u32 max_reassembly_length, u32 expire_walk_interval_ms) -{ - ip6_reass_main.timeout_ms = timeout_ms; - ip6_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC; - ip6_reass_main.max_reass_n = max_reassemblies; - ip6_reass_main.max_reass_len = max_reassembly_length; - ip6_reass_main.expire_walk_interval_ms = expire_walk_interval_ms; -} - -vnet_api_error_t -ip6_reass_set (u32 timeout_ms, u32 max_reassemblies, - u32 max_reassembly_length, u32 expire_walk_interval_ms) -{ - u32 old_nbuckets = ip6_reass_get_nbuckets (); - ip6_reass_set_params (timeout_ms, max_reassemblies, max_reassembly_length, - expire_walk_interval_ms); - vlib_process_signal_event (ip6_reass_main.vlib_main, - ip6_reass_main.ip6_reass_expire_node_idx, - IP6_EVENT_CONFIG_CHANGED, 0); - u32 new_nbuckets = ip6_reass_get_nbuckets (); - if (ip6_reass_main.max_reass_n > 0 && new_nbuckets > old_nbuckets) - { - clib_bihash_48_8_t new_hash; - clib_memset (&new_hash, 0, sizeof (new_hash)); - ip6_rehash_cb_ctx ctx; - ctx.failure = 0; - ctx.new_hash = &new_hash; - clib_bihash_init_48_8 (&new_hash, "ip6-reass", new_nbuckets, - new_nbuckets * 1024); - clib_bihash_foreach_key_value_pair_48_8 (&ip6_reass_main.hash, - ip6_rehash_cb, &ctx); - if (ctx.failure) - { - clib_bihash_free_48_8 (&new_hash); - return -1; - } - else - { - clib_bihash_free_48_8 (&ip6_reass_main.hash); - clib_memcpy_fast (&ip6_reass_main.hash, &new_hash, - sizeof (ip6_reass_main.hash)); - clib_bihash_copied (&ip6_reass_main.hash, &new_hash); - } - } - return 0; -} - -vnet_api_error_t -ip6_reass_get (u32 * timeout_ms, u32 * max_reassemblies, - u32 * expire_walk_interval_ms) -{ - *timeout_ms = ip6_reass_main.timeout_ms; - *max_reassemblies = ip6_reass_main.max_reass_n; - *expire_walk_interval_ms = ip6_reass_main.expire_walk_interval_ms; - return 0; -} - -static clib_error_t * -ip6_reass_init_function (vlib_main_t * vm) -{ - ip6_reass_main_t *rm = &ip6_reass_main; - clib_error_t *error = 0; - u32 nbuckets; - vlib_node_t *node; - - rm->vlib_main = vm; - - vec_validate (rm->per_thread_data, vlib_num_workers ()); - ip6_reass_per_thread_t *rt; - vec_foreach (rt, rm->per_thread_data) - { - clib_spinlock_init (&rt->lock); - pool_alloc (rt->pool, rm->max_reass_n); - } - - node = vlib_get_node_by_name (vm, (u8 *) "ip6-reassembly-expire-walk"); - ASSERT (node); - rm->ip6_reass_expire_node_idx = node->index; - - ip6_reass_set_params (IP6_REASS_TIMEOUT_DEFAULT_MS, - IP6_REASS_MAX_REASSEMBLIES_DEFAULT, - IP6_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT, - IP6_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS); - - nbuckets = ip6_reass_get_nbuckets (); - clib_bihash_init_48_8 (&rm->hash, "ip6-reass", nbuckets, nbuckets * 1024); - - node = vlib_get_node_by_name (vm, (u8 *) "ip6-drop"); - ASSERT (node); - rm->ip6_drop_idx = node->index; - node = vlib_get_node_by_name (vm, (u8 *) "ip6-icmp-error"); - ASSERT (node); - rm->ip6_icmp_error_idx = node->index; - - if ((error = vlib_call_init_function (vm, ip_main_init))) - return error; - ip6_register_protocol (IP_PROTOCOL_IPV6_FRAGMENTATION, - ip6_reass_node.index); - - rm->fq_index = vlib_frame_queue_main_init (ip6_reass_node.index, 0); - rm->fq_feature_index = - vlib_frame_queue_main_init (ip6_reass_node_feature.index, 0); - - return error; -} - -VLIB_INIT_FUNCTION (ip6_reass_init_function); -#endif /* CLIB_MARCH_VARIANT */ - -static uword -ip6_reass_walk_expired (vlib_main_t * vm, - vlib_node_runtime_t * node, vlib_frame_t * f) -{ - ip6_reass_main_t *rm = &ip6_reass_main; - uword event_type, *event_data = 0; - - while (true) - { - vlib_process_wait_for_event_or_clock (vm, - (f64) rm->expire_walk_interval_ms - / (f64) MSEC_PER_SEC); - event_type = vlib_process_get_events (vm, &event_data); - - switch (event_type) - { - case ~0: /* no events => timeout */ - /* nothing to do here */ - break; - case IP6_EVENT_CONFIG_CHANGED: - break; - default: - clib_warning ("BUG: event type 0x%wx", event_type); - break; - } - f64 now = vlib_time_now (vm); - - ip6_reass_t *reass; - int *pool_indexes_to_free = NULL; - - uword thread_index = 0; - int index; - const uword nthreads = vlib_num_workers () + 1; - u32 *vec_icmp_bi = NULL; - for (thread_index = 0; thread_index < nthreads; ++thread_index) - { - ip6_reass_per_thread_t *rt = &rm->per_thread_data[thread_index]; - clib_spinlock_lock (&rt->lock); - - vec_reset_length (pool_indexes_to_free); - /* *INDENT-OFF* */ - pool_foreach_index (index, rt->pool, ({ - reass = pool_elt_at_index (rt->pool, index); - if (now > reass->last_heard + rm->timeout) - { - vec_add1 (pool_indexes_to_free, index); - } - })); - /* *INDENT-ON* */ - int *i; - /* *INDENT-OFF* */ - vec_foreach (i, pool_indexes_to_free) - { - ip6_reass_t *reass = pool_elt_at_index (rt->pool, i[0]); - u32 icmp_bi = ~0; - ip6_reass_on_timeout (vm, node, rm, reass, &icmp_bi); - if (~0 != icmp_bi) - vec_add1 (vec_icmp_bi, icmp_bi); - - ip6_reass_free (rm, rt, reass); - } - /* *INDENT-ON* */ - - clib_spinlock_unlock (&rt->lock); - } - - while (vec_len (vec_icmp_bi) > 0) - { - vlib_frame_t *f = - vlib_get_frame_to_node (vm, rm->ip6_icmp_error_idx); - u32 *to_next = vlib_frame_vector_args (f); - u32 n_left_to_next = VLIB_FRAME_SIZE - f->n_vectors; - int trace_frame = 0; - while (vec_len (vec_icmp_bi) > 0 && n_left_to_next > 0) - { - u32 bi = vec_pop (vec_icmp_bi); - vlib_buffer_t *b = vlib_get_buffer (vm, bi); - if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED)) - trace_frame = 1; - b->error = node->errors[IP6_ERROR_REASS_TIMEOUT]; - to_next[0] = bi; - ++f->n_vectors; - to_next += 1; - n_left_to_next -= 1; - } - f->frame_flags |= (trace_frame * VLIB_FRAME_TRACE); - vlib_put_frame_to_node (vm, rm->ip6_icmp_error_idx, f); - } - - vec_free (pool_indexes_to_free); - vec_free (vec_icmp_bi); - if (event_data) - { - _vec_len (event_data) = 0; - } - } - - return 0; -} - -/* *INDENT-OFF* */ -VLIB_REGISTER_NODE (ip6_reass_expire_node) = { - .function = ip6_reass_walk_expired, - .format_trace = format_ip6_reass_trace, - .type = VLIB_NODE_TYPE_PROCESS, - .name = "ip6-reassembly-expire-walk", - - .n_errors = ARRAY_LEN (ip6_reassembly_error_strings), - .error_strings = ip6_reassembly_error_strings, - -}; -/* *INDENT-ON* */ - -static u8 * -format_ip6_reass_key (u8 * s, va_list * args) -{ - ip6_reass_key_t *key = va_arg (*args, ip6_reass_key_t *); - s = format (s, "xx_id: %u, src: %U, dst: %U, frag_id: %u, proto: %u", - key->xx_id, format_ip6_address, &key->src, format_ip6_address, - &key->dst, clib_net_to_host_u16 (key->frag_id), key->proto); - return s; -} - -static u8 * -format_ip6_reass (u8 * s, va_list * args) -{ - vlib_main_t *vm = va_arg (*args, vlib_main_t *); - ip6_reass_t *reass = va_arg (*args, ip6_reass_t *); - - s = format (s, "ID: %lu, key: %U\n first_bi: %u, data_len: %u, " - "last_packet_octet: %u, trace_op_counter: %u\n", - reass->id, format_ip6_reass_key, &reass->key, reass->first_bi, - reass->data_len, reass->last_packet_octet, - reass->trace_op_counter); - u32 bi = reass->first_bi; - u32 counter = 0; - while (~0 != bi) - { - vlib_buffer_t *b = vlib_get_buffer (vm, bi); - vnet_buffer_opaque_t *vnb = vnet_buffer (b); - s = format (s, " #%03u: range: [%u, %u], bi: %u, off: %d, len: %u, " - "fragment[%u, %u]\n", - counter, vnb->ip.reass.range_first, - vnb->ip.reass.range_last, bi, - ip6_reass_buffer_get_data_offset (b), - ip6_reass_buffer_get_data_len (b), - vnb->ip.reass.fragment_first, vnb->ip.reass.fragment_last); - if (b->flags & VLIB_BUFFER_NEXT_PRESENT) - { - bi = b->next_buffer; - } - else - { - bi = ~0; - } - } - return s; -} - -static clib_error_t * -show_ip6_reass (vlib_main_t * vm, unformat_input_t * input, - CLIB_UNUSED (vlib_cli_command_t * lmd)) -{ - ip6_reass_main_t *rm = &ip6_reass_main; - - vlib_cli_output (vm, "---------------------"); - vlib_cli_output (vm, "IP6 reassembly status"); - vlib_cli_output (vm, "---------------------"); - bool details = false; - if (unformat (input, "details")) - { - details = true; - } - - u32 sum_reass_n = 0; - u64 sum_buffers_n = 0; - ip6_reass_t *reass; - uword thread_index; - const uword nthreads = vlib_num_workers () + 1; - for (thread_index = 0; thread_index < nthreads; ++thread_index) - { - ip6_reass_per_thread_t *rt = &rm->per_thread_data[thread_index]; - clib_spinlock_lock (&rt->lock); - if (details) - { - /* *INDENT-OFF* */ - pool_foreach (reass, rt->pool, { - vlib_cli_output (vm, "%U", format_ip6_reass, vm, reass); - }); - /* *INDENT-ON* */ - } - sum_reass_n += rt->reass_n; - clib_spinlock_unlock (&rt->lock); - } - vlib_cli_output (vm, "---------------------"); - vlib_cli_output (vm, "Current IP6 reassemblies count: %lu\n", - (long unsigned) sum_reass_n); - vlib_cli_output (vm, "Maximum configured concurrent IP6 reassemblies per " - "worker-thread: %lu\n", (long unsigned) rm->max_reass_n); - vlib_cli_output (vm, "Buffers in use: %lu\n", - (long unsigned) sum_buffers_n); - return 0; -} - -/* *INDENT-OFF* */ -VLIB_CLI_COMMAND (show_ip6_reassembly_cmd, static) = { - .path = "show ip6-reassembly", - .short_help = "show ip6-reassembly [details]", - .function = show_ip6_reass, -}; -/* *INDENT-ON* */ - -#ifndef CLIB_MARCH_VARIANT -vnet_api_error_t -ip6_reass_enable_disable (u32 sw_if_index, u8 enable_disable) -{ - return vnet_feature_enable_disable ("ip6-unicast", "ip6-reassembly-feature", - sw_if_index, enable_disable, 0, 0); -} -#endif /* CLIB_MARCH_VARIANT */ - -#define foreach_ip6_reassembly_handoff_error \ -_(CONGESTION_DROP, "congestion drop") - - -typedef enum -{ -#define _(sym,str) IP6_REASSEMBLY_HANDOFF_ERROR_##sym, - foreach_ip6_reassembly_handoff_error -#undef _ - IP6_REASSEMBLY_HANDOFF_N_ERROR, -} ip6_reassembly_handoff_error_t; - -static char *ip6_reassembly_handoff_error_strings[] = { -#define _(sym,string) string, - foreach_ip6_reassembly_handoff_error -#undef _ -}; - -typedef struct -{ - u32 next_worker_index; -} ip6_reassembly_handoff_trace_t; - -static u8 * -format_ip6_reassembly_handoff_trace (u8 * s, va_list * args) -{ - CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *); - CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *); - ip6_reassembly_handoff_trace_t *t = - va_arg (*args, ip6_reassembly_handoff_trace_t *); - - s = - format (s, "ip6-reassembly-handoff: next-worker %d", - t->next_worker_index); - - return s; -} - -always_inline uword -ip6_reassembly_handoff_inline (vlib_main_t * vm, vlib_node_runtime_t * node, - vlib_frame_t * frame, bool is_feature) -{ - ip6_reass_main_t *rm = &ip6_reass_main; - - vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b; - u32 n_enq, n_left_from, *from; - u16 thread_indices[VLIB_FRAME_SIZE], *ti; - u32 fq_index; - - from = vlib_frame_vector_args (frame); - n_left_from = frame->n_vectors; - vlib_get_buffers (vm, from, bufs, n_left_from); - - b = bufs; - ti = thread_indices; - - fq_index = (is_feature) ? rm->fq_feature_index : rm->fq_index; - - while (n_left_from > 0) - { - ti[0] = - (is_feature) ? vnet_buffer (b[0])->ip. - reass.owner_feature_thread_index : vnet_buffer (b[0])->ip. - reass.owner_thread_index; - - if (PREDICT_FALSE - ((node->flags & VLIB_NODE_FLAG_TRACE) - && (b[0]->flags & VLIB_BUFFER_IS_TRACED))) - { - ip6_reassembly_handoff_trace_t *t = - vlib_add_trace (vm, node, b[0], sizeof (*t)); - t->next_worker_index = ti[0]; - } - - n_left_from -= 1; - ti += 1; - b += 1; - } - n_enq = - vlib_buffer_enqueue_to_thread (vm, fq_index, from, thread_indices, - frame->n_vectors, 1); - - if (n_enq < frame->n_vectors) - vlib_node_increment_counter (vm, node->node_index, - IP6_REASSEMBLY_HANDOFF_ERROR_CONGESTION_DROP, - frame->n_vectors - n_enq); - return frame->n_vectors; -} - -VLIB_NODE_FN (ip6_reassembly_handoff_node) (vlib_main_t * vm, - vlib_node_runtime_t * node, - vlib_frame_t * frame) -{ - return ip6_reassembly_handoff_inline (vm, node, frame, - false /* is_feature */ ); -} - -/* *INDENT-OFF* */ -VLIB_REGISTER_NODE (ip6_reassembly_handoff_node) = { - .name = "ip6-reassembly-handoff", - .vector_size = sizeof (u32), - .n_errors = ARRAY_LEN(ip6_reassembly_handoff_error_strings), - .error_strings = ip6_reassembly_handoff_error_strings, - .format_trace = format_ip6_reassembly_handoff_trace, - - .n_next_nodes = 1, - - .next_nodes = { - [0] = "error-drop", - }, -}; - - -VLIB_NODE_FN (ip6_reassembly_feature_handoff_node) (vlib_main_t * vm, - vlib_node_runtime_t * node, vlib_frame_t * frame) -{ - return ip6_reassembly_handoff_inline (vm, node, frame, true /* is_feature */ ); -} - - -/* *INDENT-OFF* */ -VLIB_REGISTER_NODE (ip6_reassembly_feature_handoff_node) = { - .name = "ip6-reass-feature-hoff", - .vector_size = sizeof (u32), - .n_errors = ARRAY_LEN(ip6_reassembly_handoff_error_strings), - .error_strings = ip6_reassembly_handoff_error_strings, - .format_trace = format_ip6_reassembly_handoff_trace, - - .n_next_nodes = 1, - - .next_nodes = { - [0] = "error-drop", - }, -}; -/* *INDENT-ON* */ - -/* - * fd.io coding-style-patch-verification: ON - * - * Local Variables: - * eval: (c-set-style "gnu") - * End: - */ diff --git a/src/vnet/ip/ip6_reassembly.h b/src/vnet/ip/ip6_reassembly.h deleted file mode 100644 index 1ca2b20813c..00000000000 --- a/src/vnet/ip/ip6_reassembly.h +++ /dev/null @@ -1,53 +0,0 @@ -/* - * Copyright (c) 2017 Cisco and/or its affiliates. - * Licensed under the Apache License, Version 2.0 (the "License"); - * you may not use this file except in compliance with the License. - * You may obtain a copy of the License at: - * - * http://www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, software - * distributed under the License is distributed on an "AS IS" BASIS, - * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - * See the License for the specific language governing permissions and - * limitations under the License. - */ - -/** - * @file - * @brief IPv6 Reassembly. - * - * This file contains the source code for IPv6 reassembly. - */ - -#ifndef __included_ip6_reassembly_h__ -#define __included_ip6_reassembly_h__ - -#include -#include - -/** - * @brief set ip6 reassembly configuration - */ -vnet_api_error_t ip6_reass_set (u32 timeout_ms, u32 max_reassemblies, - u32 max_reassembly_length, - u32 expire_walk_interval_ms); - -/** - * @brief get ip6 reassembly configuration - */ -vnet_api_error_t ip6_reass_get (u32 * timeout_ms, u32 * max_reassemblies, - u32 * expire_walk_interval_ms); - -vnet_api_error_t ip6_reass_enable_disable (u32 sw_if_index, - u8 enable_disable); - -#endif /* __included_ip6_reassembly_h */ - -/* - * fd.io coding-style-patch-verification: ON - * - * Local Variables: - * eval: (c-set-style "gnu") - * End: - */ diff --git a/src/vnet/ip/ip_api.c b/src/vnet/ip/ip_api.c index 4055dead4ba..c6d1a3cee29 100644 --- a/src/vnet/ip/ip_api.c +++ b/src/vnet/ip/ip_api.c @@ -43,8 +43,8 @@ #include #include #include -#include -#include +#include +#include #include #include @@ -2737,17 +2737,21 @@ vl_api_ip_reassembly_set_t_handler (vl_api_ip_reassembly_set_t * mp) int rv = 0; if (mp->is_ip6) { - rv = ip6_reass_set (clib_net_to_host_u32 (mp->timeout_ms), - clib_net_to_host_u32 (mp->max_reassemblies), - clib_net_to_host_u32 (mp->max_reassembly_length), - clib_net_to_host_u32 (mp->expire_walk_interval_ms)); + rv = ip6_full_reass_set (clib_net_to_host_u32 (mp->timeout_ms), + clib_net_to_host_u32 (mp->max_reassemblies), + clib_net_to_host_u32 + (mp->max_reassembly_length), + clib_net_to_host_u32 + (mp->expire_walk_interval_ms)); } else { - rv = ip4_reass_set (clib_net_to_host_u32 (mp->timeout_ms), - clib_net_to_host_u32 (mp->max_reassemblies), - clib_net_to_host_u32 (mp->max_reassembly_length), - clib_net_to_host_u32 (mp->expire_walk_interval_ms)); + rv = ip4_full_reass_set (clib_net_to_host_u32 (mp->timeout_ms), + clib_net_to_host_u32 (mp->max_reassemblies), + clib_net_to_host_u32 + (mp->max_reassembly_length), + clib_net_to_host_u32 + (mp->expire_walk_interval_ms)); } REPLY_MACRO (VL_API_IP_REASSEMBLY_SET_REPLY); @@ -2770,15 +2774,16 @@ vl_api_ip_reassembly_get_t_handler (vl_api_ip_reassembly_get_t * mp) if (mp->is_ip6) { rmp->is_ip6 = 1; - ip6_reass_get (&rmp->timeout_ms, &rmp->max_reassemblies, - &rmp->expire_walk_interval_ms); + ip6_full_reass_get (&rmp->timeout_ms, &rmp->max_reassemblies, + &rmp->max_reassembly_length, + &rmp->expire_walk_interval_ms); } else { rmp->is_ip6 = 0; - ip4_reass_get (&rmp->timeout_ms, &rmp->max_reassemblies, - &rmp->max_reassembly_length, - &rmp->expire_walk_interval_ms); + ip4_full_reass_get (&rmp->timeout_ms, &rmp->max_reassemblies, + &rmp->max_reassembly_length, + &rmp->expire_walk_interval_ms); } rmp->timeout_ms = clib_host_to_net_u32 (rmp->timeout_ms); rmp->max_reassemblies = clib_host_to_net_u32 (rmp->max_reassemblies); @@ -2793,12 +2798,13 @@ void { vl_api_ip_reassembly_enable_disable_reply_t *rmp; int rv = 0; - rv = ip4_reass_enable_disable (clib_net_to_host_u32 (mp->sw_if_index), - mp->enable_ip4); + rv = ip4_full_reass_enable_disable (clib_net_to_host_u32 (mp->sw_if_index), + mp->enable_ip4); if (0 == rv) { - rv = ip6_reass_enable_disable (clib_net_to_host_u32 (mp->sw_if_index), - mp->enable_ip6); + rv = + ip6_full_reass_enable_disable (clib_net_to_host_u32 (mp->sw_if_index), + mp->enable_ip6); } REPLY_MACRO (VL_API_IP_REASSEMBLY_ENABLE_DISABLE_REPLY); diff --git a/src/vnet/ip/reass/ip4_full_reass.c b/src/vnet/ip/reass/ip4_full_reass.c new file mode 100644 index 00000000000..7cf4f43b0a8 --- /dev/null +++ b/src/vnet/ip/reass/ip4_full_reass.c @@ -0,0 +1,1818 @@ +/* + * Copyright (c) 2017 Cisco and/or its affiliates. + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at: + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +/** + * @file + * @brief IPv4 Full Reassembly. + * + * This file contains the source code for IPv4 full reassembly. + */ + +#include +#include +#include +#include +#include +#include +#include + +#define MSEC_PER_SEC 1000 +#define IP4_REASS_TIMEOUT_DEFAULT_MS 100 +#define IP4_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS 10000 // 10 seconds default +#define IP4_REASS_MAX_REASSEMBLIES_DEFAULT 1024 +#define IP4_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT 3 +#define IP4_REASS_HT_LOAD_FACTOR (0.75) + +#define IP4_REASS_DEBUG_BUFFERS 0 +#if IP4_REASS_DEBUG_BUFFERS +#define IP4_REASS_DEBUG_BUFFER(bi, what) \ + do \ + { \ + u32 _bi = bi; \ + printf (#what "buffer %u", _bi); \ + vlib_buffer_t *_b = vlib_get_buffer (vm, _bi); \ + while (_b->flags & VLIB_BUFFER_NEXT_PRESENT) \ + { \ + _bi = _b->next_buffer; \ + printf ("[%u]", _bi); \ + _b = vlib_get_buffer (vm, _bi); \ + } \ + printf ("\n"); \ + fflush (stdout); \ + } \ + while (0) +#else +#define IP4_REASS_DEBUG_BUFFER(...) +#endif + +typedef enum +{ + IP4_REASS_RC_OK, + IP4_REASS_RC_TOO_MANY_FRAGMENTS, + IP4_REASS_RC_INTERNAL_ERROR, + IP4_REASS_RC_NO_BUF, + IP4_REASS_RC_HANDOFF, +} ip4_full_reass_rc_t; + +typedef struct +{ + union + { + struct + { + u32 xx_id; + ip4_address_t src; + ip4_address_t dst; + u16 frag_id; + u8 proto; + u8 unused; + }; + u64 as_u64[2]; + }; +} ip4_full_reass_key_t; + +typedef union +{ + struct + { + u32 reass_index; + u32 memory_owner_thread_index; + }; + u64 as_u64; +} ip4_full_reass_val_t; + +typedef union +{ + struct + { + ip4_full_reass_key_t k; + ip4_full_reass_val_t v; + }; + clib_bihash_kv_16_8_t kv; +} ip4_full_reass_kv_t; + +always_inline u32 +ip4_full_reass_buffer_get_data_offset (vlib_buffer_t * b) +{ + vnet_buffer_opaque_t *vnb = vnet_buffer (b); + return vnb->ip.reass.range_first - vnb->ip.reass.fragment_first; +} + +always_inline u16 +ip4_full_reass_buffer_get_data_len (vlib_buffer_t * b) +{ + vnet_buffer_opaque_t *vnb = vnet_buffer (b); + return clib_min (vnb->ip.reass.range_last, vnb->ip.reass.fragment_last) - + (vnb->ip.reass.fragment_first + + ip4_full_reass_buffer_get_data_offset (b)) + 1; +} + +typedef struct +{ + // hash table key + ip4_full_reass_key_t key; + // time when last packet was received + f64 last_heard; + // internal id of this reassembly + u64 id; + // buffer index of first buffer in this reassembly context + u32 first_bi; + // last octet of packet, ~0 until fragment without more_fragments arrives + u32 last_packet_octet; + // length of data collected so far + u32 data_len; + // trace operation counter + u32 trace_op_counter; + // next index - used by non-feature node + u32 next_index; + // error next index - used by custom apps (~0 if not used) + u32 error_next_index; + // minimum fragment length for this reassembly - used to estimate MTU + u16 min_fragment_length; + // number of fragments in this reassembly + u32 fragments_n; + // thread owning memory for this context (whose pool contains this ctx) + u32 memory_owner_thread_index; + // thread which received fragment with offset 0 and which sends out the + // completed reassembly + u32 sendout_thread_index; +} ip4_full_reass_t; + +typedef struct +{ + ip4_full_reass_t *pool; + u32 reass_n; + u32 id_counter; + clib_spinlock_t lock; +} ip4_full_reass_per_thread_t; + +typedef struct +{ + // IPv4 config + u32 timeout_ms; + f64 timeout; + u32 expire_walk_interval_ms; + // maximum number of fragments in one reassembly + u32 max_reass_len; + // maximum number of reassemblies + u32 max_reass_n; + + // IPv4 runtime + clib_bihash_16_8_t hash; + // per-thread data + ip4_full_reass_per_thread_t *per_thread_data; + + // convenience + vlib_main_t *vlib_main; + + // node index of ip4-drop node + u32 ip4_drop_idx; + u32 ip4_full_reass_expire_node_idx; + + /** Worker handoff */ + u32 fq_index; + u32 fq_feature_index; + +} ip4_full_reass_main_t; + +extern ip4_full_reass_main_t ip4_full_reass_main; + +#ifndef CLIB_MARCH_VARIANT +ip4_full_reass_main_t ip4_full_reass_main; +#endif /* CLIB_MARCH_VARIANT */ + +typedef enum +{ + IP4_FULL_REASS_NEXT_INPUT, + IP4_FULL_REASS_NEXT_DROP, + IP4_FULL_REASS_NEXT_HANDOFF, + IP4_FULL_REASS_N_NEXT, +} ip4_full_reass_next_t; + +typedef enum +{ + RANGE_NEW, + RANGE_SHRINK, + RANGE_DISCARD, + RANGE_OVERLAP, + FINALIZE, + HANDOFF, +} ip4_full_reass_trace_operation_e; + +typedef struct +{ + u16 range_first; + u16 range_last; + u32 range_bi; + i32 data_offset; + u32 data_len; + u32 first_bi; +} ip4_full_reass_range_trace_t; + +typedef struct +{ + ip4_full_reass_trace_operation_e action; + u32 reass_id; + ip4_full_reass_range_trace_t trace_range; + u32 size_diff; + u32 op_id; + u32 thread_id; + u32 thread_id_to; + u32 fragment_first; + u32 fragment_last; + u32 total_data_len; +} ip4_full_reass_trace_t; + +extern vlib_node_registration_t ip4_full_reass_node; +extern vlib_node_registration_t ip4_full_reass_node_feature; + +static void +ip4_full_reass_trace_details (vlib_main_t * vm, u32 bi, + ip4_full_reass_range_trace_t * trace) +{ + vlib_buffer_t *b = vlib_get_buffer (vm, bi); + vnet_buffer_opaque_t *vnb = vnet_buffer (b); + trace->range_first = vnb->ip.reass.range_first; + trace->range_last = vnb->ip.reass.range_last; + trace->data_offset = ip4_full_reass_buffer_get_data_offset (b); + trace->data_len = ip4_full_reass_buffer_get_data_len (b); + trace->range_bi = bi; +} + +static u8 * +format_ip4_full_reass_range_trace (u8 * s, va_list * args) +{ + ip4_full_reass_range_trace_t *trace = + va_arg (*args, ip4_full_reass_range_trace_t *); + s = + format (s, "range: [%u, %u], off %d, len %u, bi %u", trace->range_first, + trace->range_last, trace->data_offset, trace->data_len, + trace->range_bi); + return s; +} + +static u8 * +format_ip4_full_reass_trace (u8 * s, va_list * args) +{ + CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *); + CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *); + ip4_full_reass_trace_t *t = va_arg (*args, ip4_full_reass_trace_t *); + u32 indent = 0; + if (~0 != t->reass_id) + { + s = format (s, "reass id: %u, op id: %u, ", t->reass_id, t->op_id); + indent = format_get_indent (s); + s = + format (s, + "first bi: %u, data len: %u, ip/fragment[%u, %u]", + t->trace_range.first_bi, t->total_data_len, t->fragment_first, + t->fragment_last); + } + switch (t->action) + { + case RANGE_SHRINK: + s = format (s, "\n%Ushrink %U by %u", format_white_space, indent, + format_ip4_full_reass_range_trace, &t->trace_range, + t->size_diff); + break; + case RANGE_DISCARD: + s = format (s, "\n%Udiscard %U", format_white_space, indent, + format_ip4_full_reass_range_trace, &t->trace_range); + break; + case RANGE_NEW: + s = format (s, "\n%Unew %U", format_white_space, indent, + format_ip4_full_reass_range_trace, &t->trace_range); + break; + case RANGE_OVERLAP: + s = format (s, "\n%Uoverlapping/ignored %U", format_white_space, indent, + format_ip4_full_reass_range_trace, &t->trace_range); + break; + case FINALIZE: + s = format (s, "\n%Ufinalize reassembly", format_white_space, indent); + break; + case HANDOFF: + s = + format (s, "handoff from thread #%u to thread #%u", t->thread_id, + t->thread_id_to); + break; + } + return s; +} + +static void +ip4_full_reass_add_trace (vlib_main_t * vm, vlib_node_runtime_t * node, + ip4_full_reass_main_t * rm, + ip4_full_reass_t * reass, u32 bi, + ip4_full_reass_trace_operation_e action, + u32 size_diff, u32 thread_id_to) +{ + vlib_buffer_t *b = vlib_get_buffer (vm, bi); + vnet_buffer_opaque_t *vnb = vnet_buffer (b); + ip4_full_reass_trace_t *t = vlib_add_trace (vm, node, b, sizeof (t[0])); + if (reass) + { + t->reass_id = reass->id; + t->op_id = reass->trace_op_counter; + t->trace_range.first_bi = reass->first_bi; + t->total_data_len = reass->data_len; + ++reass->trace_op_counter; + } + else + { + t->reass_id = ~0; + t->op_id = 0; + t->trace_range.first_bi = 0; + t->total_data_len = 0; + } + t->action = action; + ip4_full_reass_trace_details (vm, bi, &t->trace_range); + t->size_diff = size_diff; + t->thread_id = vm->thread_index; + t->thread_id_to = thread_id_to; + t->fragment_first = vnb->ip.reass.fragment_first; + t->fragment_last = vnb->ip.reass.fragment_last; +#if 0 + static u8 *s = NULL; + s = format (s, "%U", format_ip4_full_reass_trace, NULL, NULL, t); + printf ("%.*s\n", vec_len (s), s); + fflush (stdout); + vec_reset_length (s); +#endif +} + +always_inline void +ip4_full_reass_free_ctx (ip4_full_reass_per_thread_t * rt, + ip4_full_reass_t * reass) +{ + pool_put (rt->pool, reass); + --rt->reass_n; +} + +always_inline void +ip4_full_reass_free (ip4_full_reass_main_t * rm, + ip4_full_reass_per_thread_t * rt, + ip4_full_reass_t * reass) +{ + clib_bihash_kv_16_8_t kv; + kv.key[0] = reass->key.as_u64[0]; + kv.key[1] = reass->key.as_u64[1]; + clib_bihash_add_del_16_8 (&rm->hash, &kv, 0); + return ip4_full_reass_free_ctx (rt, reass); +} + +always_inline void +ip4_full_reass_drop_all (vlib_main_t * vm, vlib_node_runtime_t * node, + ip4_full_reass_main_t * rm, ip4_full_reass_t * reass) +{ + u32 range_bi = reass->first_bi; + vlib_buffer_t *range_b; + vnet_buffer_opaque_t *range_vnb; + u32 *to_free = NULL; + while (~0 != range_bi) + { + range_b = vlib_get_buffer (vm, range_bi); + range_vnb = vnet_buffer (range_b); + u32 bi = range_bi; + while (~0 != bi) + { + vec_add1 (to_free, bi); + vlib_buffer_t *b = vlib_get_buffer (vm, bi); + if (b->flags & VLIB_BUFFER_NEXT_PRESENT) + { + bi = b->next_buffer; + b->flags &= ~VLIB_BUFFER_NEXT_PRESENT; + } + else + { + bi = ~0; + } + } + range_bi = range_vnb->ip.reass.next_range_bi; + } + /* send to next_error_index */ + if (~0 != reass->error_next_index) + { + u32 n_left_to_next, *to_next, next_index; + + next_index = reass->error_next_index; + u32 bi = ~0; + + while (vec_len (to_free) > 0) + { + vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); + + while (vec_len (to_free) > 0 && n_left_to_next > 0) + { + bi = vec_pop (to_free); + + if (~0 != bi) + { + to_next[0] = bi; + to_next += 1; + n_left_to_next -= 1; + } + } + vlib_put_next_frame (vm, node, next_index, n_left_to_next); + } + } + else + { + vlib_buffer_free (vm, to_free, vec_len (to_free)); + } +} + +always_inline void +ip4_full_reass_init (ip4_full_reass_t * reass) +{ + reass->first_bi = ~0; + reass->last_packet_octet = ~0; + reass->data_len = 0; + reass->next_index = ~0; + reass->error_next_index = ~0; +} + +always_inline ip4_full_reass_t * +ip4_full_reass_find_or_create (vlib_main_t * vm, vlib_node_runtime_t * node, + ip4_full_reass_main_t * rm, + ip4_full_reass_per_thread_t * rt, + ip4_full_reass_kv_t * kv, u8 * do_handoff) +{ + ip4_full_reass_t *reass; + f64 now; + +again: + + reass = NULL; + now = vlib_time_now (vm); + if (!clib_bihash_search_16_8 + (&rm->hash, (clib_bihash_kv_16_8_t *) kv, (clib_bihash_kv_16_8_t *) kv)) + { + reass = + pool_elt_at_index (rm->per_thread_data + [kv->v.memory_owner_thread_index].pool, + kv->v.reass_index); + if (vm->thread_index != reass->memory_owner_thread_index) + { + *do_handoff = 1; + return reass; + } + + if (now > reass->last_heard + rm->timeout) + { + ip4_full_reass_drop_all (vm, node, rm, reass); + ip4_full_reass_free (rm, rt, reass); + reass = NULL; + } + } + + if (reass) + { + reass->last_heard = now; + return reass; + } + + if (rt->reass_n >= rm->max_reass_n) + { + reass = NULL; + return reass; + } + else + { + pool_get (rt->pool, reass); + clib_memset (reass, 0, sizeof (*reass)); + reass->id = ((u64) vm->thread_index * 1000000000) + rt->id_counter; + reass->memory_owner_thread_index = vm->thread_index; + ++rt->id_counter; + ip4_full_reass_init (reass); + ++rt->reass_n; + } + + reass->key.as_u64[0] = ((clib_bihash_kv_16_8_t *) kv)->key[0]; + reass->key.as_u64[1] = ((clib_bihash_kv_16_8_t *) kv)->key[1]; + kv->v.reass_index = (reass - rt->pool); + kv->v.memory_owner_thread_index = vm->thread_index; + reass->last_heard = now; + + int rv = + clib_bihash_add_del_16_8 (&rm->hash, (clib_bihash_kv_16_8_t *) kv, 2); + if (rv) + { + ip4_full_reass_free_ctx (rt, reass); + reass = NULL; + // if other worker created a context already work with the other copy + if (-2 == rv) + goto again; + } + + return reass; +} + +always_inline ip4_full_reass_rc_t +ip4_full_reass_finalize (vlib_main_t * vm, vlib_node_runtime_t * node, + ip4_full_reass_main_t * rm, + ip4_full_reass_per_thread_t * rt, + ip4_full_reass_t * reass, u32 * bi0, + u32 * next0, u32 * error0, bool is_custom_app) +{ + vlib_buffer_t *first_b = vlib_get_buffer (vm, reass->first_bi); + vlib_buffer_t *last_b = NULL; + u32 sub_chain_bi = reass->first_bi; + u32 total_length = 0; + u32 buf_cnt = 0; + do + { + u32 tmp_bi = sub_chain_bi; + vlib_buffer_t *tmp = vlib_get_buffer (vm, tmp_bi); + ip4_header_t *ip = vlib_buffer_get_current (tmp); + vnet_buffer_opaque_t *vnb = vnet_buffer (tmp); + if (!(vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first) && + !(vnb->ip.reass.range_last > vnb->ip.reass.fragment_first)) + { + return IP4_REASS_RC_INTERNAL_ERROR; + } + + u32 data_len = ip4_full_reass_buffer_get_data_len (tmp); + u32 trim_front = + ip4_header_bytes (ip) + ip4_full_reass_buffer_get_data_offset (tmp); + u32 trim_end = + vlib_buffer_length_in_chain (vm, tmp) - trim_front - data_len; + if (tmp_bi == reass->first_bi) + { + /* first buffer - keep ip4 header */ + if (0 != ip4_full_reass_buffer_get_data_offset (tmp)) + { + return IP4_REASS_RC_INTERNAL_ERROR; + } + trim_front = 0; + trim_end = vlib_buffer_length_in_chain (vm, tmp) - data_len - + ip4_header_bytes (ip); + if (!(vlib_buffer_length_in_chain (vm, tmp) - trim_end > 0)) + { + return IP4_REASS_RC_INTERNAL_ERROR; + } + } + u32 keep_data = + vlib_buffer_length_in_chain (vm, tmp) - trim_front - trim_end; + while (1) + { + ++buf_cnt; + if (trim_front) + { + if (trim_front > tmp->current_length) + { + /* drop whole buffer */ + u32 to_be_freed_bi = tmp_bi; + trim_front -= tmp->current_length; + if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT)) + { + return IP4_REASS_RC_INTERNAL_ERROR; + } + tmp->flags &= ~VLIB_BUFFER_NEXT_PRESENT; + tmp_bi = tmp->next_buffer; + tmp->next_buffer = 0; + tmp = vlib_get_buffer (vm, tmp_bi); + vlib_buffer_free_one (vm, to_be_freed_bi); + continue; + } + else + { + vlib_buffer_advance (tmp, trim_front); + trim_front = 0; + } + } + if (keep_data) + { + if (last_b) + { + last_b->flags |= VLIB_BUFFER_NEXT_PRESENT; + last_b->next_buffer = tmp_bi; + } + last_b = tmp; + if (keep_data <= tmp->current_length) + { + tmp->current_length = keep_data; + keep_data = 0; + } + else + { + keep_data -= tmp->current_length; + if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT)) + { + return IP4_REASS_RC_INTERNAL_ERROR; + } + } + total_length += tmp->current_length; + if (tmp->flags & VLIB_BUFFER_NEXT_PRESENT) + { + tmp_bi = tmp->next_buffer; + tmp = vlib_get_buffer (vm, tmp->next_buffer); + } + else + { + break; + } + } + else + { + u32 to_be_freed_bi = tmp_bi; + if (reass->first_bi == tmp_bi) + { + return IP4_REASS_RC_INTERNAL_ERROR; + } + if (tmp->flags & VLIB_BUFFER_NEXT_PRESENT) + { + tmp->flags &= ~VLIB_BUFFER_NEXT_PRESENT; + tmp_bi = tmp->next_buffer; + tmp->next_buffer = 0; + tmp = vlib_get_buffer (vm, tmp_bi); + vlib_buffer_free_one (vm, to_be_freed_bi); + } + else + { + tmp->next_buffer = 0; + vlib_buffer_free_one (vm, to_be_freed_bi); + break; + } + } + } + sub_chain_bi = + vnet_buffer (vlib_get_buffer (vm, sub_chain_bi))->ip. + reass.next_range_bi; + } + while (~0 != sub_chain_bi); + + if (!last_b) + { + return IP4_REASS_RC_INTERNAL_ERROR; + } + last_b->flags &= ~VLIB_BUFFER_NEXT_PRESENT; + + if (total_length < first_b->current_length) + { + return IP4_REASS_RC_INTERNAL_ERROR; + } + total_length -= first_b->current_length; + first_b->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID; + first_b->total_length_not_including_first_buffer = total_length; + ip4_header_t *ip = vlib_buffer_get_current (first_b); + ip->flags_and_fragment_offset = 0; + ip->length = clib_host_to_net_u16 (first_b->current_length + total_length); + ip->checksum = ip4_header_checksum (ip); + if (!vlib_buffer_chain_linearize (vm, first_b)) + { + return IP4_REASS_RC_NO_BUF; + } + // reset to reconstruct the mbuf linking + first_b->flags &= ~VLIB_BUFFER_EXT_HDR_VALID; + if (PREDICT_FALSE (first_b->flags & VLIB_BUFFER_IS_TRACED)) + { + ip4_full_reass_add_trace (vm, node, rm, reass, reass->first_bi, + FINALIZE, 0, ~0); +#if 0 + // following code does a hexdump of packet fragments to stdout ... + do + { + u32 bi = reass->first_bi; + u8 *s = NULL; + while (~0 != bi) + { + vlib_buffer_t *b = vlib_get_buffer (vm, bi); + s = format (s, "%u: %U\n", bi, format_hexdump, + vlib_buffer_get_current (b), b->current_length); + if (b->flags & VLIB_BUFFER_NEXT_PRESENT) + { + bi = b->next_buffer; + } + else + { + break; + } + } + printf ("%.*s\n", vec_len (s), s); + fflush (stdout); + vec_free (s); + } + while (0); +#endif + } + *bi0 = reass->first_bi; + if (!is_custom_app) + { + *next0 = IP4_FULL_REASS_NEXT_INPUT; + } + else + { + *next0 = reass->next_index; + } + vnet_buffer (first_b)->ip.reass.estimated_mtu = reass->min_fragment_length; + *error0 = IP4_ERROR_NONE; + ip4_full_reass_free (rm, rt, reass); + reass = NULL; + return IP4_REASS_RC_OK; +} + +always_inline ip4_full_reass_rc_t +ip4_full_reass_insert_range_in_chain (vlib_main_t * vm, + ip4_full_reass_main_t * rm, + ip4_full_reass_per_thread_t * rt, + ip4_full_reass_t * reass, + u32 prev_range_bi, u32 new_next_bi) +{ + vlib_buffer_t *new_next_b = vlib_get_buffer (vm, new_next_bi); + vnet_buffer_opaque_t *new_next_vnb = vnet_buffer (new_next_b); + if (~0 != prev_range_bi) + { + vlib_buffer_t *prev_b = vlib_get_buffer (vm, prev_range_bi); + vnet_buffer_opaque_t *prev_vnb = vnet_buffer (prev_b); + new_next_vnb->ip.reass.next_range_bi = prev_vnb->ip.reass.next_range_bi; + prev_vnb->ip.reass.next_range_bi = new_next_bi; + } + else + { + if (~0 != reass->first_bi) + { + new_next_vnb->ip.reass.next_range_bi = reass->first_bi; + } + reass->first_bi = new_next_bi; + } + vnet_buffer_opaque_t *vnb = vnet_buffer (new_next_b); + if (!(vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first) && + !(vnb->ip.reass.range_last > vnb->ip.reass.fragment_first)) + { + return IP4_REASS_RC_INTERNAL_ERROR; + } + reass->data_len += ip4_full_reass_buffer_get_data_len (new_next_b); + return IP4_REASS_RC_OK; +} + +always_inline ip4_full_reass_rc_t +ip4_full_reass_remove_range_from_chain (vlib_main_t * vm, + vlib_node_runtime_t * node, + ip4_full_reass_main_t * rm, + ip4_full_reass_t * reass, + u32 prev_range_bi, u32 discard_bi) +{ + vlib_buffer_t *discard_b = vlib_get_buffer (vm, discard_bi); + vnet_buffer_opaque_t *discard_vnb = vnet_buffer (discard_b); + if (~0 != prev_range_bi) + { + vlib_buffer_t *prev_b = vlib_get_buffer (vm, prev_range_bi); + vnet_buffer_opaque_t *prev_vnb = vnet_buffer (prev_b); + if (!(prev_vnb->ip.reass.next_range_bi == discard_bi)) + { + return IP4_REASS_RC_INTERNAL_ERROR; + } + prev_vnb->ip.reass.next_range_bi = discard_vnb->ip.reass.next_range_bi; + } + else + { + reass->first_bi = discard_vnb->ip.reass.next_range_bi; + } + vnet_buffer_opaque_t *vnb = vnet_buffer (discard_b); + if (!(vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first) && + !(vnb->ip.reass.range_last > vnb->ip.reass.fragment_first)) + { + return IP4_REASS_RC_INTERNAL_ERROR; + } + reass->data_len -= ip4_full_reass_buffer_get_data_len (discard_b); + while (1) + { + u32 to_be_freed_bi = discard_bi; + if (PREDICT_FALSE (discard_b->flags & VLIB_BUFFER_IS_TRACED)) + { + ip4_full_reass_add_trace (vm, node, rm, reass, discard_bi, + RANGE_DISCARD, 0, ~0); + } + if (discard_b->flags & VLIB_BUFFER_NEXT_PRESENT) + { + discard_b->flags &= ~VLIB_BUFFER_NEXT_PRESENT; + discard_bi = discard_b->next_buffer; + discard_b->next_buffer = 0; + discard_b = vlib_get_buffer (vm, discard_bi); + vlib_buffer_free_one (vm, to_be_freed_bi); + } + else + { + discard_b->next_buffer = 0; + vlib_buffer_free_one (vm, to_be_freed_bi); + break; + } + } + return IP4_REASS_RC_OK; +} + +always_inline ip4_full_reass_rc_t +ip4_full_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node, + ip4_full_reass_main_t * rm, + ip4_full_reass_per_thread_t * rt, + ip4_full_reass_t * reass, u32 * bi0, u32 * next0, + u32 * error0, bool is_custom_app, + u32 * handoff_thread_idx) +{ + vlib_buffer_t *fb = vlib_get_buffer (vm, *bi0); + vnet_buffer_opaque_t *fvnb = vnet_buffer (fb); + if (is_custom_app) + { + // store (error_)next_index before it's overwritten + reass->next_index = fvnb->ip.reass.next_index; + reass->error_next_index = fvnb->ip.reass.error_next_index; + } + ip4_full_reass_rc_t rc = IP4_REASS_RC_OK; + int consumed = 0; + ip4_header_t *fip = vlib_buffer_get_current (fb); + const u32 fragment_first = ip4_get_fragment_offset_bytes (fip); + const u32 fragment_length = + clib_net_to_host_u16 (fip->length) - ip4_header_bytes (fip); + const u32 fragment_last = fragment_first + fragment_length - 1; + fvnb->ip.reass.fragment_first = fragment_first; + fvnb->ip.reass.fragment_last = fragment_last; + int more_fragments = ip4_get_fragment_more (fip); + u32 candidate_range_bi = reass->first_bi; + u32 prev_range_bi = ~0; + fvnb->ip.reass.range_first = fragment_first; + fvnb->ip.reass.range_last = fragment_last; + fvnb->ip.reass.next_range_bi = ~0; + if (!more_fragments) + { + reass->last_packet_octet = fragment_last; + } + if (~0 == reass->first_bi) + { + // starting a new reassembly + rc = + ip4_full_reass_insert_range_in_chain (vm, rm, rt, reass, + prev_range_bi, *bi0); + if (IP4_REASS_RC_OK != rc) + { + return rc; + } + if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED)) + { + ip4_full_reass_add_trace (vm, node, rm, reass, *bi0, RANGE_NEW, 0, + ~0); + } + *bi0 = ~0; + reass->min_fragment_length = clib_net_to_host_u16 (fip->length); + reass->fragments_n = 1; + return IP4_REASS_RC_OK; + } + reass->min_fragment_length = + clib_min (clib_net_to_host_u16 (fip->length), + fvnb->ip.reass.estimated_mtu); + while (~0 != candidate_range_bi) + { + vlib_buffer_t *candidate_b = vlib_get_buffer (vm, candidate_range_bi); + vnet_buffer_opaque_t *candidate_vnb = vnet_buffer (candidate_b); + if (fragment_first > candidate_vnb->ip.reass.range_last) + { + // this fragments starts after candidate range + prev_range_bi = candidate_range_bi; + candidate_range_bi = candidate_vnb->ip.reass.next_range_bi; + if (candidate_vnb->ip.reass.range_last < fragment_last && + ~0 == candidate_range_bi) + { + // special case - this fragment falls beyond all known ranges + rc = + ip4_full_reass_insert_range_in_chain (vm, rm, rt, reass, + prev_range_bi, *bi0); + if (IP4_REASS_RC_OK != rc) + { + return rc; + } + consumed = 1; + break; + } + continue; + } + if (fragment_last < candidate_vnb->ip.reass.range_first) + { + // this fragment ends before candidate range without any overlap + rc = + ip4_full_reass_insert_range_in_chain (vm, rm, rt, reass, + prev_range_bi, *bi0); + if (IP4_REASS_RC_OK != rc) + { + return rc; + } + consumed = 1; + } + else + { + if (fragment_first >= candidate_vnb->ip.reass.range_first && + fragment_last <= candidate_vnb->ip.reass.range_last) + { + // this fragment is a (sub)part of existing range, ignore it + if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED)) + { + ip4_full_reass_add_trace (vm, node, rm, reass, *bi0, + RANGE_OVERLAP, 0, ~0); + } + break; + } + int discard_candidate = 0; + if (fragment_first < candidate_vnb->ip.reass.range_first) + { + u32 overlap = + fragment_last - candidate_vnb->ip.reass.range_first + 1; + if (overlap < ip4_full_reass_buffer_get_data_len (candidate_b)) + { + candidate_vnb->ip.reass.range_first += overlap; + if (reass->data_len < overlap) + { + return IP4_REASS_RC_INTERNAL_ERROR; + } + reass->data_len -= overlap; + if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED)) + { + ip4_full_reass_add_trace (vm, node, rm, reass, + candidate_range_bi, + RANGE_SHRINK, 0, ~0); + } + rc = + ip4_full_reass_insert_range_in_chain (vm, rm, rt, reass, + prev_range_bi, + *bi0); + if (IP4_REASS_RC_OK != rc) + { + return rc; + } + consumed = 1; + } + else + { + discard_candidate = 1; + } + } + else if (fragment_last > candidate_vnb->ip.reass.range_last) + { + u32 overlap = + candidate_vnb->ip.reass.range_last - fragment_first + 1; + if (overlap < ip4_full_reass_buffer_get_data_len (candidate_b)) + { + fvnb->ip.reass.range_first += overlap; + if (~0 != candidate_vnb->ip.reass.next_range_bi) + { + prev_range_bi = candidate_range_bi; + candidate_range_bi = + candidate_vnb->ip.reass.next_range_bi; + continue; + } + else + { + // special case - last range discarded + rc = + ip4_full_reass_insert_range_in_chain (vm, rm, rt, + reass, + candidate_range_bi, + *bi0); + if (IP4_REASS_RC_OK != rc) + { + return rc; + } + consumed = 1; + } + } + else + { + discard_candidate = 1; + } + } + else + { + discard_candidate = 1; + } + if (discard_candidate) + { + u32 next_range_bi = candidate_vnb->ip.reass.next_range_bi; + // discard candidate range, probe next range + rc = + ip4_full_reass_remove_range_from_chain (vm, node, rm, reass, + prev_range_bi, + candidate_range_bi); + if (IP4_REASS_RC_OK != rc) + { + return rc; + } + if (~0 != next_range_bi) + { + candidate_range_bi = next_range_bi; + continue; + } + else + { + // special case - last range discarded + rc = + ip4_full_reass_insert_range_in_chain (vm, rm, rt, reass, + prev_range_bi, + *bi0); + if (IP4_REASS_RC_OK != rc) + { + return rc; + } + consumed = 1; + } + } + } + break; + } + ++reass->fragments_n; + if (consumed) + { + if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED)) + { + ip4_full_reass_add_trace (vm, node, rm, reass, *bi0, RANGE_NEW, 0, + ~0); + } + } + if (~0 != reass->last_packet_octet && + reass->data_len == reass->last_packet_octet + 1) + { + *handoff_thread_idx = reass->sendout_thread_index; + rc = + ip4_full_reass_finalize (vm, node, rm, rt, reass, bi0, next0, error0, + is_custom_app); + if (IP4_REASS_RC_OK == rc + && reass->memory_owner_thread_index != reass->sendout_thread_index) + { + rc = IP4_REASS_RC_HANDOFF; + } + } + else + { + if (consumed) + { + *bi0 = ~0; + if (reass->fragments_n > rm->max_reass_len) + { + rc = IP4_REASS_RC_TOO_MANY_FRAGMENTS; + } + } + else + { + *next0 = IP4_FULL_REASS_NEXT_DROP; + *error0 = IP4_ERROR_REASS_DUPLICATE_FRAGMENT; + } + } + return rc; +} + +always_inline uword +ip4_full_reass_inline (vlib_main_t * vm, vlib_node_runtime_t * node, + vlib_frame_t * frame, bool is_feature, + bool is_custom_app) +{ + u32 *from = vlib_frame_vector_args (frame); + u32 n_left_from, n_left_to_next, *to_next, next_index; + ip4_full_reass_main_t *rm = &ip4_full_reass_main; + ip4_full_reass_per_thread_t *rt = &rm->per_thread_data[vm->thread_index]; + clib_spinlock_lock (&rt->lock); + + n_left_from = frame->n_vectors; + next_index = node->cached_next_index; + while (n_left_from > 0) + { + vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); + + while (n_left_from > 0 && n_left_to_next > 0) + { + u32 bi0; + vlib_buffer_t *b0; + u32 next0; + u32 error0 = IP4_ERROR_NONE; + + bi0 = from[0]; + b0 = vlib_get_buffer (vm, bi0); + + ip4_header_t *ip0 = vlib_buffer_get_current (b0); + if (!ip4_get_fragment_more (ip0) && !ip4_get_fragment_offset (ip0)) + { + // this is a whole packet - no fragmentation + if (!is_custom_app) + { + next0 = IP4_FULL_REASS_NEXT_INPUT; + } + else + { + next0 = vnet_buffer (b0)->ip.reass.next_index; + } + goto packet_enqueue; + } + const u32 fragment_first = ip4_get_fragment_offset_bytes (ip0); + const u32 fragment_length = + clib_net_to_host_u16 (ip0->length) - ip4_header_bytes (ip0); + const u32 fragment_last = fragment_first + fragment_length - 1; + if (fragment_first > fragment_last || fragment_first + fragment_length > UINT16_MAX - 20 || (fragment_length < 8 && ip4_get_fragment_more (ip0))) // 8 is minimum frag length per RFC 791 + { + next0 = IP4_FULL_REASS_NEXT_DROP; + error0 = IP4_ERROR_REASS_MALFORMED_PACKET; + goto packet_enqueue; + } + ip4_full_reass_kv_t kv; + u8 do_handoff = 0; + + kv.k.as_u64[0] = + (u64) vec_elt (ip4_main.fib_index_by_sw_if_index, + vnet_buffer (b0)->sw_if_index[VLIB_RX]) | + (u64) ip0->src_address.as_u32 << 32; + kv.k.as_u64[1] = + (u64) ip0->dst_address. + as_u32 | (u64) ip0->fragment_id << 32 | (u64) ip0->protocol << 48; + + ip4_full_reass_t *reass = + ip4_full_reass_find_or_create (vm, node, rm, rt, &kv, + &do_handoff); + + if (reass) + { + const u32 fragment_first = ip4_get_fragment_offset_bytes (ip0); + if (0 == fragment_first) + { + reass->sendout_thread_index = vm->thread_index; + } + } + + if (PREDICT_FALSE (do_handoff)) + { + next0 = IP4_FULL_REASS_NEXT_HANDOFF; + if (is_feature) + vnet_buffer (b0)->ip.reass.owner_feature_thread_index = + kv.v.memory_owner_thread_index; + else + vnet_buffer (b0)->ip.reass.owner_thread_index = + kv.v.memory_owner_thread_index; + } + else if (reass) + { + u32 handoff_thread_idx; + switch (ip4_full_reass_update + (vm, node, rm, rt, reass, &bi0, &next0, + &error0, is_custom_app, &handoff_thread_idx)) + { + case IP4_REASS_RC_OK: + /* nothing to do here */ + break; + case IP4_REASS_RC_HANDOFF: + next0 = IP4_FULL_REASS_NEXT_HANDOFF; + b0 = vlib_get_buffer (vm, bi0); + if (is_feature) + vnet_buffer (b0)->ip.reass.owner_feature_thread_index = + handoff_thread_idx; + else + vnet_buffer (b0)->ip.reass.owner_thread_index = + handoff_thread_idx; + break; + case IP4_REASS_RC_TOO_MANY_FRAGMENTS: + vlib_node_increment_counter (vm, node->node_index, + IP4_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG, + 1); + ip4_full_reass_drop_all (vm, node, rm, reass); + ip4_full_reass_free (rm, rt, reass); + goto next_packet; + break; + case IP4_REASS_RC_NO_BUF: + vlib_node_increment_counter (vm, node->node_index, + IP4_ERROR_REASS_NO_BUF, 1); + ip4_full_reass_drop_all (vm, node, rm, reass); + ip4_full_reass_free (rm, rt, reass); + goto next_packet; + break; + case IP4_REASS_RC_INTERNAL_ERROR: + /* drop everything and start with a clean slate */ + vlib_node_increment_counter (vm, node->node_index, + IP4_ERROR_REASS_INTERNAL_ERROR, + 1); + ip4_full_reass_drop_all (vm, node, rm, reass); + ip4_full_reass_free (rm, rt, reass); + goto next_packet; + break; + } + } + else + { + next0 = IP4_FULL_REASS_NEXT_DROP; + error0 = IP4_ERROR_REASS_LIMIT_REACHED; + } + + + packet_enqueue: + b0->error = node->errors[error0]; + + if (bi0 != ~0) + { + to_next[0] = bi0; + to_next += 1; + n_left_to_next -= 1; + if (next0 == IP4_FULL_REASS_NEXT_HANDOFF) + { + if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) + { + if (is_feature) + ip4_full_reass_add_trace (vm, node, rm, NULL, + bi0, HANDOFF, 0, + vnet_buffer (b0)->ip. + reass.owner_feature_thread_index); + else + ip4_full_reass_add_trace (vm, node, rm, NULL, + bi0, HANDOFF, 0, + vnet_buffer (b0)->ip. + reass.owner_thread_index); + } + } + else if (is_feature && IP4_ERROR_NONE == error0) + { + b0 = vlib_get_buffer (vm, bi0); + vnet_feature_next (&next0, b0); + } + vlib_validate_buffer_enqueue_x1 (vm, node, next_index, + to_next, n_left_to_next, + bi0, next0); + IP4_REASS_DEBUG_BUFFER (bi0, enqueue_next); + } + + next_packet: + from += 1; + n_left_from -= 1; + } + + vlib_put_next_frame (vm, node, next_index, n_left_to_next); + } + + clib_spinlock_unlock (&rt->lock); + return frame->n_vectors; +} + +static char *ip4_full_reass_error_strings[] = { +#define _(sym, string) string, + foreach_ip4_error +#undef _ +}; + +VLIB_NODE_FN (ip4_full_reass_node) (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * frame) +{ + return ip4_full_reass_inline (vm, node, frame, false /* is_feature */ , + false /* is_custom_app */ ); +} + +/* *INDENT-OFF* */ +VLIB_REGISTER_NODE (ip4_full_reass_node) = { + .name = "ip4-full-reassembly", + .vector_size = sizeof (u32), + .format_trace = format_ip4_full_reass_trace, + .n_errors = ARRAY_LEN (ip4_full_reass_error_strings), + .error_strings = ip4_full_reass_error_strings, + .n_next_nodes = IP4_FULL_REASS_N_NEXT, + .next_nodes = + { + [IP4_FULL_REASS_NEXT_INPUT] = "ip4-input", + [IP4_FULL_REASS_NEXT_DROP] = "ip4-drop", + [IP4_FULL_REASS_NEXT_HANDOFF] = "ip4-full-reassembly-handoff", + + }, +}; +/* *INDENT-ON* */ + +VLIB_NODE_FN (ip4_full_reass_node_feature) (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * frame) +{ + return ip4_full_reass_inline (vm, node, frame, true /* is_feature */ , + false /* is_custom_app */ ); +} + +/* *INDENT-OFF* */ +VLIB_REGISTER_NODE (ip4_full_reass_node_feature) = { + .name = "ip4-full-reassembly-feature", + .vector_size = sizeof (u32), + .format_trace = format_ip4_full_reass_trace, + .n_errors = ARRAY_LEN (ip4_full_reass_error_strings), + .error_strings = ip4_full_reass_error_strings, + .n_next_nodes = IP4_FULL_REASS_N_NEXT, + .next_nodes = + { + [IP4_FULL_REASS_NEXT_INPUT] = "ip4-input", + [IP4_FULL_REASS_NEXT_DROP] = "ip4-drop", + [IP4_FULL_REASS_NEXT_HANDOFF] = "ip4-full-reass-feature-hoff", + }, +}; +/* *INDENT-ON* */ + +/* *INDENT-OFF* */ +VNET_FEATURE_INIT (ip4_full_reass_feature, static) = { + .arc_name = "ip4-unicast", + .node_name = "ip4-full-reassembly-feature", + .runs_before = VNET_FEATURES ("ip4-lookup", + "ipsec4-input-feature"), + .runs_after = 0, +}; +/* *INDENT-ON* */ + +#ifndef CLIB_MARCH_VARIANT +always_inline u32 +ip4_full_reass_get_nbuckets () +{ + ip4_full_reass_main_t *rm = &ip4_full_reass_main; + u32 nbuckets; + u8 i; + + nbuckets = (u32) (rm->max_reass_n / IP4_REASS_HT_LOAD_FACTOR); + + for (i = 0; i < 31; i++) + if ((1 << i) >= nbuckets) + break; + nbuckets = 1 << i; + + return nbuckets; +} +#endif /* CLIB_MARCH_VARIANT */ + +typedef enum +{ + IP4_EVENT_CONFIG_CHANGED = 1, +} ip4_full_reass_event_t; + +typedef struct +{ + int failure; + clib_bihash_16_8_t *new_hash; +} ip4_rehash_cb_ctx; + +#ifndef CLIB_MARCH_VARIANT +static void +ip4_rehash_cb (clib_bihash_kv_16_8_t * kv, void *_ctx) +{ + ip4_rehash_cb_ctx *ctx = _ctx; + if (clib_bihash_add_del_16_8 (ctx->new_hash, kv, 1)) + { + ctx->failure = 1; + } +} + +static void +ip4_full_reass_set_params (u32 timeout_ms, u32 max_reassemblies, + u32 max_reassembly_length, + u32 expire_walk_interval_ms) +{ + ip4_full_reass_main.timeout_ms = timeout_ms; + ip4_full_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC; + ip4_full_reass_main.max_reass_n = max_reassemblies; + ip4_full_reass_main.max_reass_len = max_reassembly_length; + ip4_full_reass_main.expire_walk_interval_ms = expire_walk_interval_ms; +} + +vnet_api_error_t +ip4_full_reass_set (u32 timeout_ms, u32 max_reassemblies, + u32 max_reassembly_length, u32 expire_walk_interval_ms) +{ + u32 old_nbuckets = ip4_full_reass_get_nbuckets (); + ip4_full_reass_set_params (timeout_ms, max_reassemblies, + max_reassembly_length, expire_walk_interval_ms); + vlib_process_signal_event (ip4_full_reass_main.vlib_main, + ip4_full_reass_main.ip4_full_reass_expire_node_idx, + IP4_EVENT_CONFIG_CHANGED, 0); + u32 new_nbuckets = ip4_full_reass_get_nbuckets (); + if (ip4_full_reass_main.max_reass_n > 0 && new_nbuckets > old_nbuckets) + { + clib_bihash_16_8_t new_hash; + clib_memset (&new_hash, 0, sizeof (new_hash)); + ip4_rehash_cb_ctx ctx; + ctx.failure = 0; + ctx.new_hash = &new_hash; + clib_bihash_init_16_8 (&new_hash, "ip4-dr", new_nbuckets, + new_nbuckets * 1024); + clib_bihash_foreach_key_value_pair_16_8 (&ip4_full_reass_main.hash, + ip4_rehash_cb, &ctx); + if (ctx.failure) + { + clib_bihash_free_16_8 (&new_hash); + return -1; + } + else + { + clib_bihash_free_16_8 (&ip4_full_reass_main.hash); + clib_memcpy_fast (&ip4_full_reass_main.hash, &new_hash, + sizeof (ip4_full_reass_main.hash)); + clib_bihash_copied (&ip4_full_reass_main.hash, &new_hash); + } + } + return 0; +} + +vnet_api_error_t +ip4_full_reass_get (u32 * timeout_ms, u32 * max_reassemblies, + u32 * max_reassembly_length, + u32 * expire_walk_interval_ms) +{ + *timeout_ms = ip4_full_reass_main.timeout_ms; + *max_reassemblies = ip4_full_reass_main.max_reass_n; + *max_reassembly_length = ip4_full_reass_main.max_reass_len; + *expire_walk_interval_ms = ip4_full_reass_main.expire_walk_interval_ms; + return 0; +} + +static clib_error_t * +ip4_full_reass_init_function (vlib_main_t * vm) +{ + ip4_full_reass_main_t *rm = &ip4_full_reass_main; + clib_error_t *error = 0; + u32 nbuckets; + vlib_node_t *node; + + rm->vlib_main = vm; + + vec_validate (rm->per_thread_data, vlib_num_workers ()); + ip4_full_reass_per_thread_t *rt; + vec_foreach (rt, rm->per_thread_data) + { + clib_spinlock_init (&rt->lock); + pool_alloc (rt->pool, rm->max_reass_n); + } + + node = vlib_get_node_by_name (vm, (u8 *) "ip4-full-reassembly-expire-walk"); + ASSERT (node); + rm->ip4_full_reass_expire_node_idx = node->index; + + ip4_full_reass_set_params (IP4_REASS_TIMEOUT_DEFAULT_MS, + IP4_REASS_MAX_REASSEMBLIES_DEFAULT, + IP4_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT, + IP4_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS); + + nbuckets = ip4_full_reass_get_nbuckets (); + clib_bihash_init_16_8 (&rm->hash, "ip4-dr", nbuckets, nbuckets * 1024); + + node = vlib_get_node_by_name (vm, (u8 *) "ip4-drop"); + ASSERT (node); + rm->ip4_drop_idx = node->index; + + rm->fq_index = vlib_frame_queue_main_init (ip4_full_reass_node.index, 0); + rm->fq_feature_index = + vlib_frame_queue_main_init (ip4_full_reass_node_feature.index, 0); + + return error; +} + +VLIB_INIT_FUNCTION (ip4_full_reass_init_function); +#endif /* CLIB_MARCH_VARIANT */ + +static uword +ip4_full_reass_walk_expired (vlib_main_t * vm, + vlib_node_runtime_t * node, vlib_frame_t * f) +{ + ip4_full_reass_main_t *rm = &ip4_full_reass_main; + uword event_type, *event_data = 0; + + while (true) + { + vlib_process_wait_for_event_or_clock (vm, + (f64) + rm->expire_walk_interval_ms / + (f64) MSEC_PER_SEC); + event_type = vlib_process_get_events (vm, &event_data); + + switch (event_type) + { + case ~0: /* no events => timeout */ + /* nothing to do here */ + break; + case IP4_EVENT_CONFIG_CHANGED: + break; + default: + clib_warning ("BUG: event type 0x%wx", event_type); + break; + } + f64 now = vlib_time_now (vm); + + ip4_full_reass_t *reass; + int *pool_indexes_to_free = NULL; + + uword thread_index = 0; + int index; + const uword nthreads = vlib_num_workers () + 1; + for (thread_index = 0; thread_index < nthreads; ++thread_index) + { + ip4_full_reass_per_thread_t *rt = + &rm->per_thread_data[thread_index]; + clib_spinlock_lock (&rt->lock); + + vec_reset_length (pool_indexes_to_free); + /* *INDENT-OFF* */ + pool_foreach_index (index, rt->pool, ({ + reass = pool_elt_at_index (rt->pool, index); + if (now > reass->last_heard + rm->timeout) + { + vec_add1 (pool_indexes_to_free, index); + } + })); + /* *INDENT-ON* */ + int *i; + /* *INDENT-OFF* */ + vec_foreach (i, pool_indexes_to_free) + { + ip4_full_reass_t *reass = pool_elt_at_index (rt->pool, i[0]); + ip4_full_reass_drop_all (vm, node, rm, reass); + ip4_full_reass_free (rm, rt, reass); + } + /* *INDENT-ON* */ + + clib_spinlock_unlock (&rt->lock); + } + + vec_free (pool_indexes_to_free); + if (event_data) + { + _vec_len (event_data) = 0; + } + } + + return 0; +} + +/* *INDENT-OFF* */ +VLIB_REGISTER_NODE (ip4_full_reass_expire_node) = { + .function = ip4_full_reass_walk_expired, + .type = VLIB_NODE_TYPE_PROCESS, + .name = "ip4-full-reassembly-expire-walk", + .format_trace = format_ip4_full_reass_trace, + .n_errors = ARRAY_LEN (ip4_full_reass_error_strings), + .error_strings = ip4_full_reass_error_strings, + +}; +/* *INDENT-ON* */ + +static u8 * +format_ip4_full_reass_key (u8 * s, va_list * args) +{ + ip4_full_reass_key_t *key = va_arg (*args, ip4_full_reass_key_t *); + s = + format (s, + "xx_id: %u, src: %U, dst: %U, frag_id: %u, proto: %u", + key->xx_id, format_ip4_address, &key->src, format_ip4_address, + &key->dst, clib_net_to_host_u16 (key->frag_id), key->proto); + return s; +} + +static u8 * +format_ip4_reass (u8 * s, va_list * args) +{ + vlib_main_t *vm = va_arg (*args, vlib_main_t *); + ip4_full_reass_t *reass = va_arg (*args, ip4_full_reass_t *); + + s = format (s, "ID: %lu, key: %U\n first_bi: %u, data_len: %u, " + "last_packet_octet: %u, trace_op_counter: %u\n", + reass->id, format_ip4_full_reass_key, &reass->key, + reass->first_bi, reass->data_len, + reass->last_packet_octet, reass->trace_op_counter); + + u32 bi = reass->first_bi; + u32 counter = 0; + while (~0 != bi) + { + vlib_buffer_t *b = vlib_get_buffer (vm, bi); + vnet_buffer_opaque_t *vnb = vnet_buffer (b); + s = + format (s, + " #%03u: range: [%u, %u], bi: %u, off: %d, len: %u, " + "fragment[%u, %u]\n", counter, vnb->ip.reass.range_first, + vnb->ip.reass.range_last, bi, + ip4_full_reass_buffer_get_data_offset (b), + ip4_full_reass_buffer_get_data_len (b), + vnb->ip.reass.fragment_first, vnb->ip.reass.fragment_last); + if (b->flags & VLIB_BUFFER_NEXT_PRESENT) + { + bi = b->next_buffer; + } + else + { + bi = ~0; + } + } + return s; +} + +static clib_error_t * +show_ip4_reass (vlib_main_t * vm, + unformat_input_t * input, + CLIB_UNUSED (vlib_cli_command_t * lmd)) +{ + ip4_full_reass_main_t *rm = &ip4_full_reass_main; + + vlib_cli_output (vm, "---------------------"); + vlib_cli_output (vm, "IP4 reassembly status"); + vlib_cli_output (vm, "---------------------"); + bool details = false; + if (unformat (input, "details")) + { + details = true; + } + + u32 sum_reass_n = 0; + ip4_full_reass_t *reass; + uword thread_index; + const uword nthreads = vlib_num_workers () + 1; + for (thread_index = 0; thread_index < nthreads; ++thread_index) + { + ip4_full_reass_per_thread_t *rt = &rm->per_thread_data[thread_index]; + clib_spinlock_lock (&rt->lock); + if (details) + { + /* *INDENT-OFF* */ + pool_foreach (reass, rt->pool, { + vlib_cli_output (vm, "%U", format_ip4_reass, vm, reass); + }); + /* *INDENT-ON* */ + } + sum_reass_n += rt->reass_n; + clib_spinlock_unlock (&rt->lock); + } + vlib_cli_output (vm, "---------------------"); + vlib_cli_output (vm, "Current IP4 reassemblies count: %lu\n", + (long unsigned) sum_reass_n); + vlib_cli_output (vm, + "Maximum configured concurrent IP4 reassemblies per worker-thread: %lu\n", + (long unsigned) rm->max_reass_n); + return 0; +} + +/* *INDENT-OFF* */ +VLIB_CLI_COMMAND (show_ip4_full_reass_cmd, static) = { + .path = "show ip4-full-reassembly", + .short_help = "show ip4-full-reassembly [details]", + .function = show_ip4_reass, +}; +/* *INDENT-ON* */ + +#ifndef CLIB_MARCH_VARIANT +vnet_api_error_t +ip4_full_reass_enable_disable (u32 sw_if_index, u8 enable_disable) +{ + return vnet_feature_enable_disable ("ip4-unicast", + "ip4-full-reassembly-feature", + sw_if_index, enable_disable, 0, 0); +} +#endif /* CLIB_MARCH_VARIANT */ + + +#define foreach_ip4_full_reass_handoff_error \ +_(CONGESTION_DROP, "congestion drop") + + +typedef enum +{ +#define _(sym,str) IP4_FULL_REASS_HANDOFF_ERROR_##sym, + foreach_ip4_full_reass_handoff_error +#undef _ + IP4_FULL_REASS_HANDOFF_N_ERROR, +} ip4_full_reass_handoff_error_t; + +static char *ip4_full_reass_handoff_error_strings[] = { +#define _(sym,string) string, + foreach_ip4_full_reass_handoff_error +#undef _ +}; + +typedef struct +{ + u32 next_worker_index; +} ip4_full_reass_handoff_trace_t; + +static u8 * +format_ip4_full_reass_handoff_trace (u8 * s, va_list * args) +{ + CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *); + CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *); + ip4_full_reass_handoff_trace_t *t = + va_arg (*args, ip4_full_reass_handoff_trace_t *); + + s = + format (s, "ip4-full-reassembly-handoff: next-worker %d", + t->next_worker_index); + + return s; +} + +always_inline uword +ip4_full_reass_handoff_node_inline (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * frame, bool is_feature) +{ + ip4_full_reass_main_t *rm = &ip4_full_reass_main; + + vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b; + u32 n_enq, n_left_from, *from; + u16 thread_indices[VLIB_FRAME_SIZE], *ti; + u32 fq_index; + + from = vlib_frame_vector_args (frame); + n_left_from = frame->n_vectors; + vlib_get_buffers (vm, from, bufs, n_left_from); + + b = bufs; + ti = thread_indices; + + fq_index = (is_feature) ? rm->fq_feature_index : rm->fq_index; + + while (n_left_from > 0) + { + ti[0] = + (is_feature) ? vnet_buffer (b[0])->ip. + reass.owner_feature_thread_index : vnet_buffer (b[0])->ip. + reass.owner_thread_index; + + if (PREDICT_FALSE + ((node->flags & VLIB_NODE_FLAG_TRACE) + && (b[0]->flags & VLIB_BUFFER_IS_TRACED))) + { + ip4_full_reass_handoff_trace_t *t = + vlib_add_trace (vm, node, b[0], sizeof (*t)); + t->next_worker_index = ti[0]; + } + + n_left_from -= 1; + ti += 1; + b += 1; + } + n_enq = + vlib_buffer_enqueue_to_thread (vm, fq_index, from, thread_indices, + frame->n_vectors, 1); + + if (n_enq < frame->n_vectors) + vlib_node_increment_counter (vm, node->node_index, + IP4_FULL_REASS_HANDOFF_ERROR_CONGESTION_DROP, + frame->n_vectors - n_enq); + return frame->n_vectors; +} + +VLIB_NODE_FN (ip4_full_reass_handoff_node) (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * frame) +{ + return ip4_full_reass_handoff_node_inline (vm, node, frame, + false /* is_feature */ ); +} + + +/* *INDENT-OFF* */ +VLIB_REGISTER_NODE (ip4_full_reass_handoff_node) = { + .name = "ip4-full-reassembly-handoff", + .vector_size = sizeof (u32), + .n_errors = ARRAY_LEN(ip4_full_reass_handoff_error_strings), + .error_strings = ip4_full_reass_handoff_error_strings, + .format_trace = format_ip4_full_reass_handoff_trace, + + .n_next_nodes = 1, + + .next_nodes = { + [0] = "error-drop", + }, +}; +/* *INDENT-ON* */ + + +/* *INDENT-OFF* */ +VLIB_NODE_FN (ip4_full_reass_feature_handoff_node) (vlib_main_t * vm, + vlib_node_runtime_t * + node, + vlib_frame_t * frame) +{ + return ip4_full_reass_handoff_node_inline (vm, node, frame, + true /* is_feature */ ); +} +/* *INDENT-ON* */ + + +/* *INDENT-OFF* */ +VLIB_REGISTER_NODE (ip4_full_reass_feature_handoff_node) = { + .name = "ip4-full-reass-feature-hoff", + .vector_size = sizeof (u32), + .n_errors = ARRAY_LEN(ip4_full_reass_handoff_error_strings), + .error_strings = ip4_full_reass_handoff_error_strings, + .format_trace = format_ip4_full_reass_handoff_trace, + + .n_next_nodes = 1, + + .next_nodes = { + [0] = "error-drop", + }, +}; +/* *INDENT-ON* */ + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ diff --git a/src/vnet/ip/reass/ip4_full_reass.h b/src/vnet/ip/reass/ip4_full_reass.h new file mode 100644 index 00000000000..b8419eb4492 --- /dev/null +++ b/src/vnet/ip/reass/ip4_full_reass.h @@ -0,0 +1,54 @@ +/* + * Copyright (c) 2017 Cisco and/or its affiliates. + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at: + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +/** + * @file + * @brief IPv4 Reassembly. + * + * This file contains the source code for IPv4 reassembly. + */ + +#ifndef __included_ip4_full_reass_h__ +#define __included_ip4_full_reass_h__ + +#include +#include + +/** + * @brief set ip4 reassembly configuration + */ +vnet_api_error_t ip4_full_reass_set (u32 timeout_ms, u32 max_reassemblies, + u32 max_reassembly_length, + u32 expire_walk_interval_ms); + +/** + * @brief get ip4 reassembly configuration + */ +vnet_api_error_t ip4_full_reass_get (u32 * timeout_ms, u32 * max_reassemblies, + u32 * max_reassembly_length, + u32 * expire_walk_interval_ms); + +vnet_api_error_t ip4_full_reass_enable_disable (u32 sw_if_index, + u8 enable_disable); + +#endif /* __included_ip4_full_reass_h__ */ + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ diff --git a/src/vnet/ip/reass/ip6_full_reass.c b/src/vnet/ip/reass/ip6_full_reass.c new file mode 100644 index 00000000000..7b11e78b40f --- /dev/null +++ b/src/vnet/ip/reass/ip6_full_reass.c @@ -0,0 +1,1812 @@ +/* + * Copyright (c) 2017 Cisco and/or its affiliates. + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at: + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +/** + * @file + * @brief IPv6 Full Reassembly. + * + * This file contains the source code for IPv6 full reassembly. + */ + +#include +#include +#include +#include +#include + +#define MSEC_PER_SEC 1000 +#define IP6_FULL_REASS_TIMEOUT_DEFAULT_MS 100 +#define IP6_FULL_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS 10000 // 10 seconds default +#define IP6_FULL_REASS_MAX_REASSEMBLIES_DEFAULT 1024 +#define IP6_FULL_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT 3 +#define IP6_FULL_REASS_HT_LOAD_FACTOR (0.75) + +typedef enum +{ + IP6_FULL_REASS_RC_OK, + IP6_FULL_REASS_RC_INTERNAL_ERROR, + IP6_FULL_REASS_RC_TOO_MANY_FRAGMENTS, + IP6_FULL_REASS_RC_NO_BUF, + IP6_FULL_REASS_RC_HANDOFF, +} ip6_full_reass_rc_t; + +typedef struct +{ + union + { + struct + { + ip6_address_t src; + ip6_address_t dst; + u32 xx_id; + u32 frag_id; + u8 unused[7]; + u8 proto; + }; + u64 as_u64[6]; + }; +} ip6_full_reass_key_t; + +typedef union +{ + struct + { + u32 reass_index; + u32 memory_owner_thread_index; + }; + u64 as_u64; +} ip6_full_reass_val_t; + +typedef union +{ + struct + { + ip6_full_reass_key_t k; + ip6_full_reass_val_t v; + }; + clib_bihash_kv_48_8_t kv; +} ip6_full_reass_kv_t; + + +always_inline u32 +ip6_full_reass_buffer_get_data_offset (vlib_buffer_t * b) +{ + vnet_buffer_opaque_t *vnb = vnet_buffer (b); + return vnb->ip.reass.range_first - vnb->ip.reass.fragment_first; +} + +always_inline u16 +ip6_full_reass_buffer_get_data_len (vlib_buffer_t * b) +{ + vnet_buffer_opaque_t *vnb = vnet_buffer (b); + return clib_min (vnb->ip.reass.range_last, vnb->ip.reass.fragment_last) - + (vnb->ip.reass.fragment_first + + ip6_full_reass_buffer_get_data_offset (b)) + 1; +} + +typedef struct +{ + // hash table key + ip6_full_reass_key_t key; + // time when last packet was received + f64 last_heard; + // internal id of this reassembly + u64 id; + // buffer index of first buffer in this reassembly context + u32 first_bi; + // last octet of packet, ~0 until fragment without more_fragments arrives + u32 last_packet_octet; + // length of data collected so far + u32 data_len; + // trace operation counter + u32 trace_op_counter; + // next index - used by custom apps (~0 if not set) + u32 next_index; + // error next index - used by custom apps (~0 if not set) + u32 error_next_index; + // minimum fragment length for this reassembly - used to estimate MTU + u16 min_fragment_length; + // number of fragments for this reassembly + u32 fragments_n; + // thread owning memory for this context (whose pool contains this ctx) + u32 memory_owner_thread_index; + // thread which received fragment with offset 0 and which sends out the + // completed reassembly + u32 sendout_thread_index; +} ip6_full_reass_t; + +typedef struct +{ + ip6_full_reass_t *pool; + u32 reass_n; + u32 id_counter; + clib_spinlock_t lock; +} ip6_full_reass_per_thread_t; + +typedef struct +{ + // IPv6 config + u32 timeout_ms; + f64 timeout; + u32 expire_walk_interval_ms; + // maximum number of fragments in one reassembly + u32 max_reass_len; + // maximum number of reassemblies + u32 max_reass_n; + + // IPv6 runtime + clib_bihash_48_8_t hash; + + // per-thread data + ip6_full_reass_per_thread_t *per_thread_data; + + // convenience + vlib_main_t *vlib_main; + + // node index of ip6-drop node + u32 ip6_drop_idx; + u32 ip6_icmp_error_idx; + u32 ip6_full_reass_expire_node_idx; + + /** Worker handoff */ + u32 fq_index; + u32 fq_feature_index; + +} ip6_full_reass_main_t; + +extern ip6_full_reass_main_t ip6_full_reass_main; + +#ifndef CLIB_MARCH_VARIANT +ip6_full_reass_main_t ip6_full_reass_main; +#endif /* CLIB_MARCH_VARIANT */ + +typedef enum +{ + IP6_FULL_REASSEMBLY_NEXT_INPUT, + IP6_FULL_REASSEMBLY_NEXT_DROP, + IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR, + IP6_FULL_REASSEMBLY_NEXT_HANDOFF, + IP6_FULL_REASSEMBLY_N_NEXT, +} ip6_full_reass_next_t; + +typedef enum +{ + RANGE_NEW, + RANGE_OVERLAP, + ICMP_ERROR_RT_EXCEEDED, + ICMP_ERROR_FL_TOO_BIG, + ICMP_ERROR_FL_NOT_MULT_8, + FINALIZE, + HANDOFF, +} ip6_full_reass_trace_operation_e; + +typedef struct +{ + u16 range_first; + u16 range_last; + u32 range_bi; + i32 data_offset; + u32 data_len; + u32 first_bi; +} ip6_full_reass_range_trace_t; + +typedef struct +{ + ip6_full_reass_trace_operation_e action; + u32 reass_id; + ip6_full_reass_range_trace_t trace_range; + u32 op_id; + u32 fragment_first; + u32 fragment_last; + u32 total_data_len; + u32 thread_id; + u32 thread_id_to; +} ip6_full_reass_trace_t; + +static void +ip6_full_reass_trace_details (vlib_main_t * vm, u32 bi, + ip6_full_reass_range_trace_t * trace) +{ + vlib_buffer_t *b = vlib_get_buffer (vm, bi); + vnet_buffer_opaque_t *vnb = vnet_buffer (b); + trace->range_first = vnb->ip.reass.range_first; + trace->range_last = vnb->ip.reass.range_last; + trace->data_offset = ip6_full_reass_buffer_get_data_offset (b); + trace->data_len = ip6_full_reass_buffer_get_data_len (b); + trace->range_bi = bi; +} + +static u8 * +format_ip6_full_reass_range_trace (u8 * s, va_list * args) +{ + ip6_full_reass_range_trace_t *trace = + va_arg (*args, ip6_full_reass_range_trace_t *); + s = + format (s, "range: [%u, %u], off %d, len %u, bi %u", trace->range_first, + trace->range_last, trace->data_offset, trace->data_len, + trace->range_bi); + return s; +} + +static u8 * +format_ip6_full_reass_trace (u8 * s, va_list * args) +{ + CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *); + CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *); + ip6_full_reass_trace_t *t = va_arg (*args, ip6_full_reass_trace_t *); + u32 indent = 0; + if (~0 != t->reass_id) + { + s = format (s, "reass id: %u, op id: %u ", t->reass_id, t->op_id); + indent = format_get_indent (s); + s = format (s, "first bi: %u, data len: %u, ip/fragment[%u, %u]", + t->trace_range.first_bi, t->total_data_len, + t->fragment_first, t->fragment_last); + } + switch (t->action) + { + case RANGE_NEW: + s = format (s, "\n%Unew %U", format_white_space, indent, + format_ip6_full_reass_range_trace, &t->trace_range); + break; + case RANGE_OVERLAP: + s = format (s, "\n%Uoverlap %U", format_white_space, indent, + format_ip6_full_reass_range_trace, &t->trace_range); + break; + case ICMP_ERROR_FL_TOO_BIG: + s = format (s, "\n%Uicmp-error - frag_len > 65535 %U", + format_white_space, indent, + format_ip6_full_reass_range_trace, &t->trace_range); + break; + case ICMP_ERROR_FL_NOT_MULT_8: + s = format (s, "\n%Uicmp-error - frag_len mod 8 != 0 %U", + format_white_space, indent, + format_ip6_full_reass_range_trace, &t->trace_range); + break; + case ICMP_ERROR_RT_EXCEEDED: + s = format (s, "\n%Uicmp-error - reassembly time exceeded", + format_white_space, indent); + break; + case FINALIZE: + s = format (s, "\n%Ufinalize reassembly", format_white_space, indent); + break; + case HANDOFF: + s = + format (s, "handoff from thread #%u to thread #%u", t->thread_id, + t->thread_id_to); + break; + } + return s; +} + +static void +ip6_full_reass_add_trace (vlib_main_t * vm, vlib_node_runtime_t * node, + ip6_full_reass_main_t * rm, + ip6_full_reass_t * reass, u32 bi, + ip6_full_reass_trace_operation_e action, + u32 thread_id_to) +{ + vlib_buffer_t *b = vlib_get_buffer (vm, bi); + vnet_buffer_opaque_t *vnb = vnet_buffer (b); + ip6_full_reass_trace_t *t = vlib_add_trace (vm, node, b, sizeof (t[0])); + if (reass) + { + t->reass_id = reass->id; + t->op_id = reass->trace_op_counter; + t->trace_range.first_bi = reass->first_bi; + t->total_data_len = reass->data_len; + ++reass->trace_op_counter; + } + else + { + t->reass_id = ~0; + } + t->action = action; + t->thread_id = vm->thread_index; + t->thread_id_to = thread_id_to; + ip6_full_reass_trace_details (vm, bi, &t->trace_range); + t->fragment_first = vnb->ip.reass.fragment_first; + t->fragment_last = vnb->ip.reass.fragment_last; +#if 0 + static u8 *s = NULL; + s = format (s, "%U", format_ip6_full_reass_trace, NULL, NULL, t); + printf ("%.*s\n", vec_len (s), s); + fflush (stdout); + vec_reset_length (s); +#endif +} + +always_inline void +ip6_full_reass_free_ctx (ip6_full_reass_per_thread_t * rt, + ip6_full_reass_t * reass) +{ + pool_put (rt->pool, reass); + --rt->reass_n; +} + +always_inline void +ip6_full_reass_free (ip6_full_reass_main_t * rm, + ip6_full_reass_per_thread_t * rt, + ip6_full_reass_t * reass) +{ + clib_bihash_kv_48_8_t kv; + kv.key[0] = reass->key.as_u64[0]; + kv.key[1] = reass->key.as_u64[1]; + kv.key[2] = reass->key.as_u64[2]; + kv.key[3] = reass->key.as_u64[3]; + kv.key[4] = reass->key.as_u64[4]; + kv.key[5] = reass->key.as_u64[5]; + clib_bihash_add_del_48_8 (&rm->hash, &kv, 0); + ip6_full_reass_free_ctx (rt, reass); +} + +always_inline void +ip6_full_reass_drop_all (vlib_main_t * vm, vlib_node_runtime_t * node, + ip6_full_reass_main_t * rm, ip6_full_reass_t * reass) +{ + u32 range_bi = reass->first_bi; + vlib_buffer_t *range_b; + vnet_buffer_opaque_t *range_vnb; + u32 *to_free = NULL; + while (~0 != range_bi) + { + range_b = vlib_get_buffer (vm, range_bi); + range_vnb = vnet_buffer (range_b); + u32 bi = range_bi; + while (~0 != bi) + { + vec_add1 (to_free, bi); + vlib_buffer_t *b = vlib_get_buffer (vm, bi); + if (b->flags & VLIB_BUFFER_NEXT_PRESENT) + { + bi = b->next_buffer; + b->flags &= ~VLIB_BUFFER_NEXT_PRESENT; + } + else + { + bi = ~0; + } + } + range_bi = range_vnb->ip.reass.next_range_bi; + } + /* send to next_error_index */ + if (~0 != reass->error_next_index) + { + u32 n_left_to_next, *to_next, next_index; + + next_index = reass->error_next_index; + u32 bi = ~0; + + while (vec_len (to_free) > 0) + { + vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); + + while (vec_len (to_free) > 0 && n_left_to_next > 0) + { + bi = vec_pop (to_free); + + if (~0 != bi) + { + to_next[0] = bi; + to_next += 1; + n_left_to_next -= 1; + } + } + vlib_put_next_frame (vm, node, next_index, n_left_to_next); + } + } + else + { + vlib_buffer_free (vm, to_free, vec_len (to_free)); + } + vec_free (to_free); +} + +always_inline void +ip6_full_reass_on_timeout (vlib_main_t * vm, vlib_node_runtime_t * node, + ip6_full_reass_main_t * rm, + ip6_full_reass_t * reass, u32 * icmp_bi) +{ + if (~0 == reass->first_bi) + { + return; + } + if (~0 == reass->next_index) // custom apps don't want icmp + { + vlib_buffer_t *b = vlib_get_buffer (vm, reass->first_bi); + if (0 == vnet_buffer (b)->ip.reass.fragment_first) + { + *icmp_bi = reass->first_bi; + if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED)) + { + ip6_full_reass_add_trace (vm, node, rm, reass, reass->first_bi, + ICMP_ERROR_RT_EXCEEDED, ~0); + } + // fragment with offset zero received - send icmp message back + if (b->flags & VLIB_BUFFER_NEXT_PRESENT) + { + // separate first buffer from chain and steer it towards icmp node + b->flags &= ~VLIB_BUFFER_NEXT_PRESENT; + reass->first_bi = b->next_buffer; + } + else + { + reass->first_bi = vnet_buffer (b)->ip.reass.next_range_bi; + } + icmp6_error_set_vnet_buffer (b, ICMP6_time_exceeded, + ICMP6_time_exceeded_fragment_reassembly_time_exceeded, + 0); + } + } + ip6_full_reass_drop_all (vm, node, rm, reass); +} + +always_inline ip6_full_reass_t * +ip6_full_reass_find_or_create (vlib_main_t * vm, vlib_node_runtime_t * node, + ip6_full_reass_main_t * rm, + ip6_full_reass_per_thread_t * rt, + ip6_full_reass_kv_t * kv, u32 * icmp_bi, + u8 * do_handoff) +{ + ip6_full_reass_t *reass; + f64 now; + +again: + + reass = NULL; + now = vlib_time_now (vm); + + if (!clib_bihash_search_48_8 + (&rm->hash, (clib_bihash_kv_48_8_t *) kv, (clib_bihash_kv_48_8_t *) kv)) + { + reass = + pool_elt_at_index (rm->per_thread_data + [kv->v.memory_owner_thread_index].pool, + kv->v.reass_index); + if (vm->thread_index != kv->v.memory_owner_thread_index) + { + *do_handoff = 1; + return reass; + } + + if (now > reass->last_heard + rm->timeout) + { + ip6_full_reass_on_timeout (vm, node, rm, reass, icmp_bi); + ip6_full_reass_free (rm, rt, reass); + reass = NULL; + } + } + + if (reass) + { + reass->last_heard = now; + return reass; + } + + if (rt->reass_n >= rm->max_reass_n) + { + reass = NULL; + return reass; + } + else + { + pool_get (rt->pool, reass); + clib_memset (reass, 0, sizeof (*reass)); + reass->id = ((u64) vm->thread_index * 1000000000) + rt->id_counter; + ++rt->id_counter; + reass->first_bi = ~0; + reass->last_packet_octet = ~0; + reass->data_len = 0; + reass->next_index = ~0; + reass->error_next_index = ~0; + ++rt->reass_n; + } + + reass->key.as_u64[0] = ((clib_bihash_kv_48_8_t *) kv)->key[0]; + reass->key.as_u64[1] = ((clib_bihash_kv_48_8_t *) kv)->key[1]; + reass->key.as_u64[2] = ((clib_bihash_kv_48_8_t *) kv)->key[2]; + reass->key.as_u64[3] = ((clib_bihash_kv_48_8_t *) kv)->key[3]; + reass->key.as_u64[4] = ((clib_bihash_kv_48_8_t *) kv)->key[4]; + reass->key.as_u64[5] = ((clib_bihash_kv_48_8_t *) kv)->key[5]; + kv->v.reass_index = (reass - rt->pool); + kv->v.memory_owner_thread_index = vm->thread_index; + reass->last_heard = now; + + int rv = + clib_bihash_add_del_48_8 (&rm->hash, (clib_bihash_kv_48_8_t *) kv, 2); + if (rv) + { + ip6_full_reass_free (rm, rt, reass); + reass = NULL; + // if other worker created a context already work with the other copy + if (-2 == rv) + goto again; + } + + return reass; +} + +always_inline ip6_full_reass_rc_t +ip6_full_reass_finalize (vlib_main_t * vm, vlib_node_runtime_t * node, + ip6_full_reass_main_t * rm, + ip6_full_reass_per_thread_t * rt, + ip6_full_reass_t * reass, u32 * bi0, u32 * next0, + u32 * error0, bool is_custom_app) +{ + *bi0 = reass->first_bi; + *error0 = IP6_ERROR_NONE; + ip6_frag_hdr_t *frag_hdr; + vlib_buffer_t *last_b = NULL; + u32 sub_chain_bi = reass->first_bi; + u32 total_length = 0; + u32 buf_cnt = 0; + u32 dropped_cnt = 0; + u32 *vec_drop_compress = NULL; + ip6_full_reass_rc_t rv = IP6_FULL_REASS_RC_OK; + do + { + u32 tmp_bi = sub_chain_bi; + vlib_buffer_t *tmp = vlib_get_buffer (vm, tmp_bi); + vnet_buffer_opaque_t *vnb = vnet_buffer (tmp); + if (!(vnb->ip.reass.range_first >= vnb->ip.reass.fragment_first) && + !(vnb->ip.reass.range_last > vnb->ip.reass.fragment_first)) + { + rv = IP6_FULL_REASS_RC_INTERNAL_ERROR; + goto free_buffers_and_return; + } + + u32 data_len = ip6_full_reass_buffer_get_data_len (tmp); + u32 trim_front = vnet_buffer (tmp)->ip.reass.ip6_frag_hdr_offset + + sizeof (*frag_hdr) + ip6_full_reass_buffer_get_data_offset (tmp); + u32 trim_end = + vlib_buffer_length_in_chain (vm, tmp) - trim_front - data_len; + if (tmp_bi == reass->first_bi) + { + /* first buffer - keep ip6 header */ + if (0 != ip6_full_reass_buffer_get_data_offset (tmp)) + { + rv = IP6_FULL_REASS_RC_INTERNAL_ERROR; + goto free_buffers_and_return; + } + trim_front = 0; + trim_end = vlib_buffer_length_in_chain (vm, tmp) - data_len - + (vnet_buffer (tmp)->ip.reass.ip6_frag_hdr_offset + + sizeof (*frag_hdr)); + if (!(vlib_buffer_length_in_chain (vm, tmp) - trim_end > 0)) + { + rv = IP6_FULL_REASS_RC_INTERNAL_ERROR; + goto free_buffers_and_return; + } + } + u32 keep_data = + vlib_buffer_length_in_chain (vm, tmp) - trim_front - trim_end; + while (1) + { + ++buf_cnt; + if (trim_front) + { + if (trim_front > tmp->current_length) + { + /* drop whole buffer */ + vec_add1 (vec_drop_compress, tmp_bi); + trim_front -= tmp->current_length; + if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT)) + { + rv = IP6_FULL_REASS_RC_INTERNAL_ERROR; + goto free_buffers_and_return; + } + tmp->flags &= ~VLIB_BUFFER_NEXT_PRESENT; + tmp_bi = tmp->next_buffer; + tmp = vlib_get_buffer (vm, tmp_bi); + continue; + } + else + { + vlib_buffer_advance (tmp, trim_front); + trim_front = 0; + } + } + if (keep_data) + { + if (last_b) + { + last_b->flags |= VLIB_BUFFER_NEXT_PRESENT; + last_b->next_buffer = tmp_bi; + } + last_b = tmp; + if (keep_data <= tmp->current_length) + { + tmp->current_length = keep_data; + keep_data = 0; + } + else + { + keep_data -= tmp->current_length; + if (!(tmp->flags & VLIB_BUFFER_NEXT_PRESENT)) + { + rv = IP6_FULL_REASS_RC_INTERNAL_ERROR; + goto free_buffers_and_return; + } + } + total_length += tmp->current_length; + } + else + { + vec_add1 (vec_drop_compress, tmp_bi); + if (reass->first_bi == tmp_bi) + { + rv = IP6_FULL_REASS_RC_INTERNAL_ERROR; + goto free_buffers_and_return; + } + ++dropped_cnt; + } + if (tmp->flags & VLIB_BUFFER_NEXT_PRESENT) + { + tmp_bi = tmp->next_buffer; + tmp = vlib_get_buffer (vm, tmp->next_buffer); + } + else + { + break; + } + } + sub_chain_bi = + vnet_buffer (vlib_get_buffer (vm, sub_chain_bi))->ip. + reass.next_range_bi; + } + while (~0 != sub_chain_bi); + + if (!last_b) + { + rv = IP6_FULL_REASS_RC_INTERNAL_ERROR; + goto free_buffers_and_return; + } + last_b->flags &= ~VLIB_BUFFER_NEXT_PRESENT; + vlib_buffer_t *first_b = vlib_get_buffer (vm, reass->first_bi); + if (total_length < first_b->current_length) + { + rv = IP6_FULL_REASS_RC_INTERNAL_ERROR; + goto free_buffers_and_return; + } + total_length -= first_b->current_length; + first_b->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID; + first_b->total_length_not_including_first_buffer = total_length; + // drop fragment header + vnet_buffer_opaque_t *first_b_vnb = vnet_buffer (first_b); + ip6_header_t *ip = vlib_buffer_get_current (first_b); + u16 ip6_frag_hdr_offset = first_b_vnb->ip.reass.ip6_frag_hdr_offset; + ip6_ext_header_t *prev_hdr; + ip6_ext_header_find_t (ip, prev_hdr, frag_hdr, + IP_PROTOCOL_IPV6_FRAGMENTATION); + if (prev_hdr) + { + prev_hdr->next_hdr = frag_hdr->next_hdr; + } + else + { + ip->protocol = frag_hdr->next_hdr; + } + if (!((u8 *) frag_hdr - (u8 *) ip == ip6_frag_hdr_offset)) + { + rv = IP6_FULL_REASS_RC_INTERNAL_ERROR; + goto free_buffers_and_return; + } + memmove (frag_hdr, (u8 *) frag_hdr + sizeof (*frag_hdr), + first_b->current_length - ip6_frag_hdr_offset - + sizeof (ip6_frag_hdr_t)); + first_b->current_length -= sizeof (*frag_hdr); + ip->payload_length = + clib_host_to_net_u16 (total_length + first_b->current_length - + sizeof (*ip)); + if (!vlib_buffer_chain_linearize (vm, first_b)) + { + rv = IP6_FULL_REASS_RC_NO_BUF; + goto free_buffers_and_return; + } + first_b->flags &= ~VLIB_BUFFER_EXT_HDR_VALID; + if (PREDICT_FALSE (first_b->flags & VLIB_BUFFER_IS_TRACED)) + { + ip6_full_reass_add_trace (vm, node, rm, reass, reass->first_bi, + FINALIZE, ~0); +#if 0 + // following code does a hexdump of packet fragments to stdout ... + do + { + u32 bi = reass->first_bi; + u8 *s = NULL; + while (~0 != bi) + { + vlib_buffer_t *b = vlib_get_buffer (vm, bi); + s = format (s, "%u: %U\n", bi, format_hexdump, + vlib_buffer_get_current (b), b->current_length); + if (b->flags & VLIB_BUFFER_NEXT_PRESENT) + { + bi = b->next_buffer; + } + else + { + break; + } + } + printf ("%.*s\n", vec_len (s), s); + fflush (stdout); + vec_free (s); + } + while (0); +#endif + } + if (!is_custom_app) + { + *next0 = IP6_FULL_REASSEMBLY_NEXT_INPUT; + } + else + { + *next0 = reass->next_index; + } + vnet_buffer (first_b)->ip.reass.estimated_mtu = reass->min_fragment_length; + ip6_full_reass_free (rm, rt, reass); + reass = NULL; +free_buffers_and_return: + vlib_buffer_free (vm, vec_drop_compress, vec_len (vec_drop_compress)); + vec_free (vec_drop_compress); + return rv; +} + +always_inline void +ip6_full_reass_insert_range_in_chain (vlib_main_t * vm, + ip6_full_reass_main_t * rm, + ip6_full_reass_per_thread_t * rt, + ip6_full_reass_t * reass, + u32 prev_range_bi, u32 new_next_bi) +{ + + vlib_buffer_t *new_next_b = vlib_get_buffer (vm, new_next_bi); + vnet_buffer_opaque_t *new_next_vnb = vnet_buffer (new_next_b); + if (~0 != prev_range_bi) + { + vlib_buffer_t *prev_b = vlib_get_buffer (vm, prev_range_bi); + vnet_buffer_opaque_t *prev_vnb = vnet_buffer (prev_b); + new_next_vnb->ip.reass.next_range_bi = prev_vnb->ip.reass.next_range_bi; + prev_vnb->ip.reass.next_range_bi = new_next_bi; + } + else + { + if (~0 != reass->first_bi) + { + new_next_vnb->ip.reass.next_range_bi = reass->first_bi; + } + reass->first_bi = new_next_bi; + } + reass->data_len += ip6_full_reass_buffer_get_data_len (new_next_b); +} + +always_inline ip6_full_reass_rc_t +ip6_full_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node, + ip6_full_reass_main_t * rm, + ip6_full_reass_per_thread_t * rt, + ip6_full_reass_t * reass, u32 * bi0, u32 * next0, + u32 * error0, ip6_frag_hdr_t * frag_hdr, + bool is_custom_app, u32 * handoff_thread_idx) +{ + int consumed = 0; + vlib_buffer_t *fb = vlib_get_buffer (vm, *bi0); + vnet_buffer_opaque_t *fvnb = vnet_buffer (fb); + if (is_custom_app) + { + reass->next_index = fvnb->ip.reass.next_index; // store next_index before it's overwritten + reass->error_next_index = fvnb->ip.reass.error_next_index; // store error_next_index before it is overwritten + } + + fvnb->ip.reass.ip6_frag_hdr_offset = + (u8 *) frag_hdr - (u8 *) vlib_buffer_get_current (fb); + ip6_header_t *fip = vlib_buffer_get_current (fb); + if (fb->current_length < sizeof (*fip) || + fvnb->ip.reass.ip6_frag_hdr_offset == 0 || + fvnb->ip.reass.ip6_frag_hdr_offset >= fb->current_length) + { + return IP6_FULL_REASS_RC_INTERNAL_ERROR; + } + + u32 fragment_first = fvnb->ip.reass.fragment_first = + ip6_frag_hdr_offset_bytes (frag_hdr); + u32 fragment_length = + vlib_buffer_length_in_chain (vm, fb) - + (fvnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr)); + u32 fragment_last = fvnb->ip.reass.fragment_last = + fragment_first + fragment_length - 1; + int more_fragments = ip6_frag_hdr_more (frag_hdr); + u32 candidate_range_bi = reass->first_bi; + u32 prev_range_bi = ~0; + fvnb->ip.reass.range_first = fragment_first; + fvnb->ip.reass.range_last = fragment_last; + fvnb->ip.reass.next_range_bi = ~0; + if (!more_fragments) + { + reass->last_packet_octet = fragment_last; + } + if (~0 == reass->first_bi) + { + // starting a new reassembly + ip6_full_reass_insert_range_in_chain (vm, rm, rt, reass, prev_range_bi, + *bi0); + reass->min_fragment_length = clib_net_to_host_u16 (fip->payload_length); + consumed = 1; + reass->fragments_n = 1; + goto check_if_done_maybe; + } + reass->min_fragment_length = + clib_min (clib_net_to_host_u16 (fip->payload_length), + fvnb->ip.reass.estimated_mtu); + while (~0 != candidate_range_bi) + { + vlib_buffer_t *candidate_b = vlib_get_buffer (vm, candidate_range_bi); + vnet_buffer_opaque_t *candidate_vnb = vnet_buffer (candidate_b); + if (fragment_first > candidate_vnb->ip.reass.range_last) + { + // this fragments starts after candidate range + prev_range_bi = candidate_range_bi; + candidate_range_bi = candidate_vnb->ip.reass.next_range_bi; + if (candidate_vnb->ip.reass.range_last < fragment_last && + ~0 == candidate_range_bi) + { + // special case - this fragment falls beyond all known ranges + ip6_full_reass_insert_range_in_chain (vm, rm, rt, reass, + prev_range_bi, *bi0); + consumed = 1; + break; + } + continue; + } + if (fragment_last < candidate_vnb->ip.reass.range_first) + { + // this fragment ends before candidate range without any overlap + ip6_full_reass_insert_range_in_chain (vm, rm, rt, reass, + prev_range_bi, *bi0); + consumed = 1; + } + else if (fragment_first == candidate_vnb->ip.reass.range_first && + fragment_last == candidate_vnb->ip.reass.range_last) + { + // duplicate fragment - ignore + } + else + { + // overlapping fragment - not allowed by RFC 8200 + ip6_full_reass_drop_all (vm, node, rm, reass); + ip6_full_reass_free (rm, rt, reass); + if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED)) + { + ip6_full_reass_add_trace (vm, node, rm, reass, *bi0, + RANGE_OVERLAP, ~0); + } + *next0 = IP6_FULL_REASSEMBLY_NEXT_DROP; + *error0 = IP6_ERROR_REASS_OVERLAPPING_FRAGMENT; + return IP6_FULL_REASS_RC_OK; + } + break; + } + ++reass->fragments_n; +check_if_done_maybe: + if (consumed) + { + if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED)) + { + ip6_full_reass_add_trace (vm, node, rm, reass, *bi0, RANGE_NEW, ~0); + } + } + if (~0 != reass->last_packet_octet && + reass->data_len == reass->last_packet_octet + 1) + { + *handoff_thread_idx = reass->sendout_thread_index; + ip6_full_reass_rc_t rc = + ip6_full_reass_finalize (vm, node, rm, rt, reass, bi0, next0, error0, + is_custom_app); + if (IP6_FULL_REASS_RC_OK == rc + && reass->memory_owner_thread_index != reass->sendout_thread_index) + { + return IP6_FULL_REASS_RC_HANDOFF; + } + return rc; + } + else + { + if (consumed) + { + *bi0 = ~0; + if (reass->fragments_n > rm->max_reass_len) + { + return IP6_FULL_REASS_RC_TOO_MANY_FRAGMENTS; + } + } + else + { + *next0 = IP6_FULL_REASSEMBLY_NEXT_DROP; + *error0 = IP6_ERROR_REASS_DUPLICATE_FRAGMENT; + } + } + return IP6_FULL_REASS_RC_OK; +} + +always_inline bool +ip6_full_reass_verify_upper_layer_present (vlib_node_runtime_t * node, + vlib_buffer_t * b, + ip6_frag_hdr_t * frag_hdr) +{ + ip6_ext_header_t *tmp = (ip6_ext_header_t *) frag_hdr; + while (ip6_ext_hdr (tmp->next_hdr)) + { + tmp = ip6_ext_next_header (tmp); + } + if (IP_PROTOCOL_IP6_NONXT == tmp->next_hdr) + { + icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem, + ICMP6_parameter_problem_first_fragment_has_incomplete_header_chain, + 0); + b->error = node->errors[IP6_ERROR_REASS_MISSING_UPPER]; + + return false; + } + return true; +} + +always_inline bool +ip6_full_reass_verify_fragment_multiple_8 (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_buffer_t * b, + ip6_frag_hdr_t * frag_hdr) +{ + vnet_buffer_opaque_t *vnb = vnet_buffer (b); + ip6_header_t *ip = vlib_buffer_get_current (b); + int more_fragments = ip6_frag_hdr_more (frag_hdr); + u32 fragment_length = + vlib_buffer_length_in_chain (vm, b) - + (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr)); + if (more_fragments && 0 != fragment_length % 8) + { + icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem, + ICMP6_parameter_problem_erroneous_header_field, + (u8 *) & ip->payload_length - (u8 *) ip); + return false; + } + return true; +} + +always_inline bool +ip6_full_reass_verify_packet_size_lt_64k (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_buffer_t * b, + ip6_frag_hdr_t * frag_hdr) +{ + vnet_buffer_opaque_t *vnb = vnet_buffer (b); + u32 fragment_first = ip6_frag_hdr_offset_bytes (frag_hdr); + u32 fragment_length = + vlib_buffer_length_in_chain (vm, b) - + (vnb->ip.reass.ip6_frag_hdr_offset + sizeof (*frag_hdr)); + if (fragment_first + fragment_length > 65535) + { + ip6_header_t *ip0 = vlib_buffer_get_current (b); + icmp6_error_set_vnet_buffer (b, ICMP6_parameter_problem, + ICMP6_parameter_problem_erroneous_header_field, + (u8 *) & frag_hdr->fragment_offset_and_more + - (u8 *) ip0); + return false; + } + return true; +} + +always_inline uword +ip6_full_reassembly_inline (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * frame, bool is_feature, + bool is_custom_app) +{ + u32 *from = vlib_frame_vector_args (frame); + u32 n_left_from, n_left_to_next, *to_next, next_index; + ip6_full_reass_main_t *rm = &ip6_full_reass_main; + ip6_full_reass_per_thread_t *rt = &rm->per_thread_data[vm->thread_index]; + clib_spinlock_lock (&rt->lock); + + n_left_from = frame->n_vectors; + next_index = node->cached_next_index; + while (n_left_from > 0) + { + vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); + + while (n_left_from > 0 && n_left_to_next > 0) + { + u32 bi0; + vlib_buffer_t *b0; + u32 next0 = IP6_FULL_REASSEMBLY_NEXT_DROP; + u32 error0 = IP6_ERROR_NONE; + u32 icmp_bi = ~0; + + bi0 = from[0]; + b0 = vlib_get_buffer (vm, bi0); + + ip6_header_t *ip0 = vlib_buffer_get_current (b0); + ip6_frag_hdr_t *frag_hdr = NULL; + ip6_ext_header_t *prev_hdr; + if (ip6_ext_hdr (ip0->protocol)) + { + ip6_ext_header_find_t (ip0, prev_hdr, frag_hdr, + IP_PROTOCOL_IPV6_FRAGMENTATION); + } + if (!frag_hdr) + { + // this is a regular packet - no fragmentation + next0 = IP6_FULL_REASSEMBLY_NEXT_INPUT; + goto skip_reass; + } + if (0 == ip6_frag_hdr_offset (frag_hdr)) + { + // first fragment - verify upper-layer is present + if (!ip6_full_reass_verify_upper_layer_present + (node, b0, frag_hdr)) + { + next0 = IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR; + goto skip_reass; + } + } + if (!ip6_full_reass_verify_fragment_multiple_8 + (vm, node, b0, frag_hdr) + || !ip6_full_reass_verify_packet_size_lt_64k (vm, node, b0, + frag_hdr)) + { + next0 = IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR; + goto skip_reass; + } + vnet_buffer (b0)->ip.reass.ip6_frag_hdr_offset = + (u8 *) frag_hdr - (u8 *) ip0; + + ip6_full_reass_kv_t kv; + u8 do_handoff = 0; + + kv.k.as_u64[0] = ip0->src_address.as_u64[0]; + kv.k.as_u64[1] = ip0->src_address.as_u64[1]; + kv.k.as_u64[2] = ip0->dst_address.as_u64[0]; + kv.k.as_u64[3] = ip0->dst_address.as_u64[1]; + kv.k.as_u64[4] = + ((u64) vec_elt (ip6_main.fib_index_by_sw_if_index, + vnet_buffer (b0)->sw_if_index[VLIB_RX])) << 32 | + (u64) frag_hdr->identification; + kv.k.as_u64[5] = ip0->protocol; + + ip6_full_reass_t *reass = + ip6_full_reass_find_or_create (vm, node, rm, rt, &kv, &icmp_bi, + &do_handoff); + + if (reass) + { + const u32 fragment_first = ip6_frag_hdr_offset (frag_hdr); + if (0 == fragment_first) + { + reass->sendout_thread_index = vm->thread_index; + } + } + if (PREDICT_FALSE (do_handoff)) + { + next0 = IP6_FULL_REASSEMBLY_NEXT_HANDOFF; + if (is_feature) + vnet_buffer (b0)->ip.reass.owner_feature_thread_index = + kv.v.memory_owner_thread_index; + else + vnet_buffer (b0)->ip.reass.owner_thread_index = + kv.v.memory_owner_thread_index; + } + else if (reass) + { + u32 handoff_thread_idx; + switch (ip6_full_reass_update + (vm, node, rm, rt, reass, &bi0, &next0, &error0, + frag_hdr, is_custom_app, &handoff_thread_idx)) + { + case IP6_FULL_REASS_RC_OK: + /* nothing to do here */ + break; + case IP6_FULL_REASS_RC_HANDOFF: + next0 = IP6_FULL_REASSEMBLY_NEXT_HANDOFF; + b0 = vlib_get_buffer (vm, bi0); + if (is_feature) + vnet_buffer (b0)->ip.reass.owner_feature_thread_index = + handoff_thread_idx; + else + vnet_buffer (b0)->ip.reass.owner_thread_index = + handoff_thread_idx; + break; + case IP6_FULL_REASS_RC_TOO_MANY_FRAGMENTS: + vlib_node_increment_counter (vm, node->node_index, + IP6_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG, + 1); + ip6_full_reass_drop_all (vm, node, rm, reass); + ip6_full_reass_free (rm, rt, reass); + goto next_packet; + break; + case IP6_FULL_REASS_RC_NO_BUF: + vlib_node_increment_counter (vm, node->node_index, + IP6_ERROR_REASS_NO_BUF, 1); + ip6_full_reass_drop_all (vm, node, rm, reass); + ip6_full_reass_free (rm, rt, reass); + goto next_packet; + break; + case IP6_FULL_REASS_RC_INTERNAL_ERROR: + vlib_node_increment_counter (vm, node->node_index, + IP6_ERROR_REASS_INTERNAL_ERROR, + 1); + ip6_full_reass_drop_all (vm, node, rm, reass); + ip6_full_reass_free (rm, rt, reass); + goto next_packet; + break; + } + } + else + { + if (is_feature) + { + next0 = IP6_FULL_REASSEMBLY_NEXT_DROP; + } + else + { + vnet_buffer_opaque_t *fvnb = vnet_buffer (b0); + next0 = fvnb->ip.reass.error_next_index; + } + error0 = IP6_ERROR_REASS_LIMIT_REACHED; + } + + b0->error = node->errors[error0]; + + if (~0 != bi0) + { + skip_reass: + to_next[0] = bi0; + to_next += 1; + n_left_to_next -= 1; + if (next0 == IP6_FULL_REASSEMBLY_NEXT_HANDOFF) + { + if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) + { + if (is_feature) + ip6_full_reass_add_trace (vm, node, rm, NULL, bi0, + HANDOFF, + vnet_buffer (b0)->ip. + reass.owner_feature_thread_index); + else + ip6_full_reass_add_trace (vm, node, rm, NULL, bi0, + HANDOFF, + vnet_buffer (b0)->ip. + reass.owner_thread_index); + } + } + else if (is_feature && IP6_ERROR_NONE == error0) + { + b0 = vlib_get_buffer (vm, bi0); + vnet_feature_next (&next0, b0); + } + vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, + n_left_to_next, bi0, next0); + } + + if (~0 != icmp_bi) + { + next0 = IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR; + to_next[0] = icmp_bi; + to_next += 1; + n_left_to_next -= 1; + vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, + n_left_to_next, icmp_bi, + next0); + } + next_packet: + from += 1; + n_left_from -= 1; + } + + vlib_put_next_frame (vm, node, next_index, n_left_to_next); + } + + clib_spinlock_unlock (&rt->lock); + return frame->n_vectors; +} + +static char *ip6_full_reassembly_error_strings[] = { +#define _(sym, string) string, + foreach_ip6_error +#undef _ +}; + +VLIB_NODE_FN (ip6_full_reass_node) (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * frame) +{ + return ip6_full_reassembly_inline (vm, node, frame, false /* is_feature */ , + false /* is_custom_app */ ); +} + +/* *INDENT-OFF* */ +VLIB_REGISTER_NODE (ip6_full_reass_node) = { + .name = "ip6-full-reassembly", + .vector_size = sizeof (u32), + .format_trace = format_ip6_full_reass_trace, + .n_errors = ARRAY_LEN (ip6_full_reassembly_error_strings), + .error_strings = ip6_full_reassembly_error_strings, + .n_next_nodes = IP6_FULL_REASSEMBLY_N_NEXT, + .next_nodes = + { + [IP6_FULL_REASSEMBLY_NEXT_INPUT] = "ip6-input", + [IP6_FULL_REASSEMBLY_NEXT_DROP] = "ip6-drop", + [IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error", + [IP6_FULL_REASSEMBLY_NEXT_HANDOFF] = "ip6-full-reassembly-handoff", + }, +}; +/* *INDENT-ON* */ + +VLIB_NODE_FN (ip6_full_reass_node_feature) (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * frame) +{ + return ip6_full_reassembly_inline (vm, node, frame, true /* is_feature */ , + false /* is_custom_app */ ); +} + +/* *INDENT-OFF* */ +VLIB_REGISTER_NODE (ip6_full_reass_node_feature) = { + .name = "ip6-full-reassembly-feature", + .vector_size = sizeof (u32), + .format_trace = format_ip6_full_reass_trace, + .n_errors = ARRAY_LEN (ip6_full_reassembly_error_strings), + .error_strings = ip6_full_reassembly_error_strings, + .n_next_nodes = IP6_FULL_REASSEMBLY_N_NEXT, + .next_nodes = + { + [IP6_FULL_REASSEMBLY_NEXT_INPUT] = "ip6-input", + [IP6_FULL_REASSEMBLY_NEXT_DROP] = "ip6-drop", + [IP6_FULL_REASSEMBLY_NEXT_ICMP_ERROR] = "ip6-icmp-error", + [IP6_FULL_REASSEMBLY_NEXT_HANDOFF] = "ip6-full-reass-feature-hoff", + }, +}; +/* *INDENT-ON* */ + +/* *INDENT-OFF* */ +VNET_FEATURE_INIT (ip6_full_reassembly_feature, static) = { + .arc_name = "ip6-unicast", + .node_name = "ip6-full-reassembly-feature", + .runs_before = VNET_FEATURES ("ip6-lookup", + "ipsec6-input-feature"), + .runs_after = 0, +}; +/* *INDENT-ON* */ + +#ifndef CLIB_MARCH_VARIANT +static u32 +ip6_full_reass_get_nbuckets () +{ + ip6_full_reass_main_t *rm = &ip6_full_reass_main; + u32 nbuckets; + u8 i; + + nbuckets = (u32) (rm->max_reass_n / IP6_FULL_REASS_HT_LOAD_FACTOR); + + for (i = 0; i < 31; i++) + if ((1 << i) >= nbuckets) + break; + nbuckets = 1 << i; + + return nbuckets; +} +#endif /* CLIB_MARCH_VARIANT */ + +typedef enum +{ + IP6_EVENT_CONFIG_CHANGED = 1, +} ip6_full_reass_event_t; + +#ifndef CLIB_MARCH_VARIANT +typedef struct +{ + int failure; + clib_bihash_48_8_t *new_hash; +} ip6_rehash_cb_ctx; + +static void +ip6_rehash_cb (clib_bihash_kv_48_8_t * kv, void *_ctx) +{ + ip6_rehash_cb_ctx *ctx = _ctx; + if (clib_bihash_add_del_48_8 (ctx->new_hash, kv, 1)) + { + ctx->failure = 1; + } +} + +static void +ip6_full_reass_set_params (u32 timeout_ms, u32 max_reassemblies, + u32 max_reassembly_length, + u32 expire_walk_interval_ms) +{ + ip6_full_reass_main.timeout_ms = timeout_ms; + ip6_full_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC; + ip6_full_reass_main.max_reass_n = max_reassemblies; + ip6_full_reass_main.max_reass_len = max_reassembly_length; + ip6_full_reass_main.expire_walk_interval_ms = expire_walk_interval_ms; +} + +vnet_api_error_t +ip6_full_reass_set (u32 timeout_ms, u32 max_reassemblies, + u32 max_reassembly_length, u32 expire_walk_interval_ms) +{ + u32 old_nbuckets = ip6_full_reass_get_nbuckets (); + ip6_full_reass_set_params (timeout_ms, max_reassemblies, + max_reassembly_length, expire_walk_interval_ms); + vlib_process_signal_event (ip6_full_reass_main.vlib_main, + ip6_full_reass_main.ip6_full_reass_expire_node_idx, + IP6_EVENT_CONFIG_CHANGED, 0); + u32 new_nbuckets = ip6_full_reass_get_nbuckets (); + if (ip6_full_reass_main.max_reass_n > 0 && new_nbuckets > old_nbuckets) + { + clib_bihash_48_8_t new_hash; + clib_memset (&new_hash, 0, sizeof (new_hash)); + ip6_rehash_cb_ctx ctx; + ctx.failure = 0; + ctx.new_hash = &new_hash; + clib_bihash_init_48_8 (&new_hash, "ip6-full-reass", new_nbuckets, + new_nbuckets * 1024); + clib_bihash_foreach_key_value_pair_48_8 (&ip6_full_reass_main.hash, + ip6_rehash_cb, &ctx); + if (ctx.failure) + { + clib_bihash_free_48_8 (&new_hash); + return -1; + } + else + { + clib_bihash_free_48_8 (&ip6_full_reass_main.hash); + clib_memcpy_fast (&ip6_full_reass_main.hash, &new_hash, + sizeof (ip6_full_reass_main.hash)); + clib_bihash_copied (&ip6_full_reass_main.hash, &new_hash); + } + } + return 0; +} + +vnet_api_error_t +ip6_full_reass_get (u32 * timeout_ms, u32 * max_reassemblies, + u32 * max_reassembly_length, + u32 * expire_walk_interval_ms) +{ + *timeout_ms = ip6_full_reass_main.timeout_ms; + *max_reassemblies = ip6_full_reass_main.max_reass_n; + *max_reassembly_length = ip6_full_reass_main.max_reass_len; + *expire_walk_interval_ms = ip6_full_reass_main.expire_walk_interval_ms; + return 0; +} + +static clib_error_t * +ip6_full_reass_init_function (vlib_main_t * vm) +{ + ip6_full_reass_main_t *rm = &ip6_full_reass_main; + clib_error_t *error = 0; + u32 nbuckets; + vlib_node_t *node; + + rm->vlib_main = vm; + + vec_validate (rm->per_thread_data, vlib_num_workers ()); + ip6_full_reass_per_thread_t *rt; + vec_foreach (rt, rm->per_thread_data) + { + clib_spinlock_init (&rt->lock); + pool_alloc (rt->pool, rm->max_reass_n); + } + + node = vlib_get_node_by_name (vm, (u8 *) "ip6-full-reassembly-expire-walk"); + ASSERT (node); + rm->ip6_full_reass_expire_node_idx = node->index; + + ip6_full_reass_set_params (IP6_FULL_REASS_TIMEOUT_DEFAULT_MS, + IP6_FULL_REASS_MAX_REASSEMBLIES_DEFAULT, + IP6_FULL_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT, + IP6_FULL_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS); + + nbuckets = ip6_full_reass_get_nbuckets (); + clib_bihash_init_48_8 (&rm->hash, "ip6-full-reass", nbuckets, + nbuckets * 1024); + + node = vlib_get_node_by_name (vm, (u8 *) "ip6-drop"); + ASSERT (node); + rm->ip6_drop_idx = node->index; + node = vlib_get_node_by_name (vm, (u8 *) "ip6-icmp-error"); + ASSERT (node); + rm->ip6_icmp_error_idx = node->index; + + if ((error = vlib_call_init_function (vm, ip_main_init))) + return error; + ip6_register_protocol (IP_PROTOCOL_IPV6_FRAGMENTATION, + ip6_full_reass_node.index); + + rm->fq_index = vlib_frame_queue_main_init (ip6_full_reass_node.index, 0); + rm->fq_feature_index = + vlib_frame_queue_main_init (ip6_full_reass_node_feature.index, 0); + + return error; +} + +VLIB_INIT_FUNCTION (ip6_full_reass_init_function); +#endif /* CLIB_MARCH_VARIANT */ + +static uword +ip6_full_reass_walk_expired (vlib_main_t * vm, + vlib_node_runtime_t * node, vlib_frame_t * f) +{ + ip6_full_reass_main_t *rm = &ip6_full_reass_main; + uword event_type, *event_data = 0; + + while (true) + { + vlib_process_wait_for_event_or_clock (vm, + (f64) rm->expire_walk_interval_ms + / (f64) MSEC_PER_SEC); + event_type = vlib_process_get_events (vm, &event_data); + + switch (event_type) + { + case ~0: /* no events => timeout */ + /* nothing to do here */ + break; + case IP6_EVENT_CONFIG_CHANGED: + break; + default: + clib_warning ("BUG: event type 0x%wx", event_type); + break; + } + f64 now = vlib_time_now (vm); + + ip6_full_reass_t *reass; + int *pool_indexes_to_free = NULL; + + uword thread_index = 0; + int index; + const uword nthreads = vlib_num_workers () + 1; + u32 *vec_icmp_bi = NULL; + for (thread_index = 0; thread_index < nthreads; ++thread_index) + { + ip6_full_reass_per_thread_t *rt = + &rm->per_thread_data[thread_index]; + clib_spinlock_lock (&rt->lock); + + vec_reset_length (pool_indexes_to_free); + /* *INDENT-OFF* */ + pool_foreach_index (index, rt->pool, ({ + reass = pool_elt_at_index (rt->pool, index); + if (now > reass->last_heard + rm->timeout) + { + vec_add1 (pool_indexes_to_free, index); + } + })); + /* *INDENT-ON* */ + int *i; + /* *INDENT-OFF* */ + vec_foreach (i, pool_indexes_to_free) + { + ip6_full_reass_t *reass = pool_elt_at_index (rt->pool, i[0]); + u32 icmp_bi = ~0; + ip6_full_reass_on_timeout (vm, node, rm, reass, &icmp_bi); + if (~0 != icmp_bi) + vec_add1 (vec_icmp_bi, icmp_bi); + + ip6_full_reass_free (rm, rt, reass); + } + /* *INDENT-ON* */ + + clib_spinlock_unlock (&rt->lock); + } + + while (vec_len (vec_icmp_bi) > 0) + { + vlib_frame_t *f = + vlib_get_frame_to_node (vm, rm->ip6_icmp_error_idx); + u32 *to_next = vlib_frame_vector_args (f); + u32 n_left_to_next = VLIB_FRAME_SIZE - f->n_vectors; + int trace_frame = 0; + while (vec_len (vec_icmp_bi) > 0 && n_left_to_next > 0) + { + u32 bi = vec_pop (vec_icmp_bi); + vlib_buffer_t *b = vlib_get_buffer (vm, bi); + if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED)) + trace_frame = 1; + b->error = node->errors[IP6_ERROR_REASS_TIMEOUT]; + to_next[0] = bi; + ++f->n_vectors; + to_next += 1; + n_left_to_next -= 1; + } + f->frame_flags |= (trace_frame * VLIB_FRAME_TRACE); + vlib_put_frame_to_node (vm, rm->ip6_icmp_error_idx, f); + } + + vec_free (pool_indexes_to_free); + vec_free (vec_icmp_bi); + if (event_data) + { + _vec_len (event_data) = 0; + } + } + + return 0; +} + +/* *INDENT-OFF* */ +VLIB_REGISTER_NODE (ip6_full_reass_expire_node) = { + .function = ip6_full_reass_walk_expired, + .format_trace = format_ip6_full_reass_trace, + .type = VLIB_NODE_TYPE_PROCESS, + .name = "ip6-full-reassembly-expire-walk", + + .n_errors = ARRAY_LEN (ip6_full_reassembly_error_strings), + .error_strings = ip6_full_reassembly_error_strings, + +}; +/* *INDENT-ON* */ + +static u8 * +format_ip6_full_reass_key (u8 * s, va_list * args) +{ + ip6_full_reass_key_t *key = va_arg (*args, ip6_full_reass_key_t *); + s = format (s, "xx_id: %u, src: %U, dst: %U, frag_id: %u, proto: %u", + key->xx_id, format_ip6_address, &key->src, format_ip6_address, + &key->dst, clib_net_to_host_u16 (key->frag_id), key->proto); + return s; +} + +static u8 * +format_ip6_full_reass (u8 * s, va_list * args) +{ + vlib_main_t *vm = va_arg (*args, vlib_main_t *); + ip6_full_reass_t *reass = va_arg (*args, ip6_full_reass_t *); + + s = format (s, "ID: %lu, key: %U\n first_bi: %u, data_len: %u, " + "last_packet_octet: %u, trace_op_counter: %u\n", + reass->id, format_ip6_full_reass_key, &reass->key, + reass->first_bi, reass->data_len, reass->last_packet_octet, + reass->trace_op_counter); + u32 bi = reass->first_bi; + u32 counter = 0; + while (~0 != bi) + { + vlib_buffer_t *b = vlib_get_buffer (vm, bi); + vnet_buffer_opaque_t *vnb = vnet_buffer (b); + s = format (s, " #%03u: range: [%u, %u], bi: %u, off: %d, len: %u, " + "fragment[%u, %u]\n", + counter, vnb->ip.reass.range_first, + vnb->ip.reass.range_last, bi, + ip6_full_reass_buffer_get_data_offset (b), + ip6_full_reass_buffer_get_data_len (b), + vnb->ip.reass.fragment_first, vnb->ip.reass.fragment_last); + if (b->flags & VLIB_BUFFER_NEXT_PRESENT) + { + bi = b->next_buffer; + } + else + { + bi = ~0; + } + } + return s; +} + +static clib_error_t * +show_ip6_full_reass (vlib_main_t * vm, unformat_input_t * input, + CLIB_UNUSED (vlib_cli_command_t * lmd)) +{ + ip6_full_reass_main_t *rm = &ip6_full_reass_main; + + vlib_cli_output (vm, "---------------------"); + vlib_cli_output (vm, "IP6 reassembly status"); + vlib_cli_output (vm, "---------------------"); + bool details = false; + if (unformat (input, "details")) + { + details = true; + } + + u32 sum_reass_n = 0; + u64 sum_buffers_n = 0; + ip6_full_reass_t *reass; + uword thread_index; + const uword nthreads = vlib_num_workers () + 1; + for (thread_index = 0; thread_index < nthreads; ++thread_index) + { + ip6_full_reass_per_thread_t *rt = &rm->per_thread_data[thread_index]; + clib_spinlock_lock (&rt->lock); + if (details) + { + /* *INDENT-OFF* */ + pool_foreach (reass, rt->pool, { + vlib_cli_output (vm, "%U", format_ip6_full_reass, vm, reass); + }); + /* *INDENT-ON* */ + } + sum_reass_n += rt->reass_n; + clib_spinlock_unlock (&rt->lock); + } + vlib_cli_output (vm, "---------------------"); + vlib_cli_output (vm, "Current IP6 reassemblies count: %lu\n", + (long unsigned) sum_reass_n); + vlib_cli_output (vm, "Maximum configured concurrent IP6 reassemblies per " + "worker-thread: %lu\n", (long unsigned) rm->max_reass_n); + vlib_cli_output (vm, "Buffers in use: %lu\n", + (long unsigned) sum_buffers_n); + return 0; +} + +/* *INDENT-OFF* */ +VLIB_CLI_COMMAND (show_ip6_full_reassembly_cmd, static) = { + .path = "show ip6-full-reassembly", + .short_help = "show ip6-full-reassembly [details]", + .function = show_ip6_full_reass, +}; +/* *INDENT-ON* */ + +#ifndef CLIB_MARCH_VARIANT +vnet_api_error_t +ip6_full_reass_enable_disable (u32 sw_if_index, u8 enable_disable) +{ + return vnet_feature_enable_disable ("ip6-unicast", + "ip6-full-reassembly-feature", + sw_if_index, enable_disable, 0, 0); +} +#endif /* CLIB_MARCH_VARIANT */ + +#define foreach_ip6_full_reassembly_handoff_error \ +_(CONGESTION_DROP, "congestion drop") + + +typedef enum +{ +#define _(sym,str) IP6_FULL_REASSEMBLY_HANDOFF_ERROR_##sym, + foreach_ip6_full_reassembly_handoff_error +#undef _ + IP6_FULL_REASSEMBLY_HANDOFF_N_ERROR, +} ip6_full_reassembly_handoff_error_t; + +static char *ip6_full_reassembly_handoff_error_strings[] = { +#define _(sym,string) string, + foreach_ip6_full_reassembly_handoff_error +#undef _ +}; + +typedef struct +{ + u32 next_worker_index; +} ip6_full_reassembly_handoff_trace_t; + +static u8 * +format_ip6_full_reassembly_handoff_trace (u8 * s, va_list * args) +{ + CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *); + CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *); + ip6_full_reassembly_handoff_trace_t *t = + va_arg (*args, ip6_full_reassembly_handoff_trace_t *); + + s = + format (s, "ip6-full-reassembly-handoff: next-worker %d", + t->next_worker_index); + + return s; +} + +always_inline uword +ip6_full_reassembly_handoff_inline (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * frame, bool is_feature) +{ + ip6_full_reass_main_t *rm = &ip6_full_reass_main; + + vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b; + u32 n_enq, n_left_from, *from; + u16 thread_indices[VLIB_FRAME_SIZE], *ti; + u32 fq_index; + + from = vlib_frame_vector_args (frame); + n_left_from = frame->n_vectors; + vlib_get_buffers (vm, from, bufs, n_left_from); + + b = bufs; + ti = thread_indices; + + fq_index = (is_feature) ? rm->fq_feature_index : rm->fq_index; + + while (n_left_from > 0) + { + ti[0] = + (is_feature) ? vnet_buffer (b[0])->ip. + reass.owner_feature_thread_index : vnet_buffer (b[0])->ip. + reass.owner_thread_index; + + if (PREDICT_FALSE + ((node->flags & VLIB_NODE_FLAG_TRACE) + && (b[0]->flags & VLIB_BUFFER_IS_TRACED))) + { + ip6_full_reassembly_handoff_trace_t *t = + vlib_add_trace (vm, node, b[0], sizeof (*t)); + t->next_worker_index = ti[0]; + } + + n_left_from -= 1; + ti += 1; + b += 1; + } + n_enq = + vlib_buffer_enqueue_to_thread (vm, fq_index, from, thread_indices, + frame->n_vectors, 1); + + if (n_enq < frame->n_vectors) + vlib_node_increment_counter (vm, node->node_index, + IP6_FULL_REASSEMBLY_HANDOFF_ERROR_CONGESTION_DROP, + frame->n_vectors - n_enq); + return frame->n_vectors; +} + +VLIB_NODE_FN (ip6_full_reassembly_handoff_node) (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * frame) +{ + return ip6_full_reassembly_handoff_inline (vm, node, frame, + false /* is_feature */ ); +} + +/* *INDENT-OFF* */ +VLIB_REGISTER_NODE (ip6_full_reassembly_handoff_node) = { + .name = "ip6-full-reassembly-handoff", + .vector_size = sizeof (u32), + .n_errors = ARRAY_LEN(ip6_full_reassembly_handoff_error_strings), + .error_strings = ip6_full_reassembly_handoff_error_strings, + .format_trace = format_ip6_full_reassembly_handoff_trace, + + .n_next_nodes = 1, + + .next_nodes = { + [0] = "error-drop", + }, +}; + + +VLIB_NODE_FN (ip6_full_reassembly_feature_handoff_node) (vlib_main_t * vm, + vlib_node_runtime_t * node, vlib_frame_t * frame) +{ + return ip6_full_reassembly_handoff_inline (vm, node, frame, true /* is_feature */ ); +} + + +/* *INDENT-OFF* */ +VLIB_REGISTER_NODE (ip6_full_reassembly_feature_handoff_node) = { + .name = "ip6-full-reass-feature-hoff", + .vector_size = sizeof (u32), + .n_errors = ARRAY_LEN(ip6_full_reassembly_handoff_error_strings), + .error_strings = ip6_full_reassembly_handoff_error_strings, + .format_trace = format_ip6_full_reassembly_handoff_trace, + + .n_next_nodes = 1, + + .next_nodes = { + [0] = "error-drop", + }, +}; +/* *INDENT-ON* */ + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ diff --git a/src/vnet/ip/reass/ip6_full_reass.h b/src/vnet/ip/reass/ip6_full_reass.h new file mode 100644 index 00000000000..c2463e0e8f3 --- /dev/null +++ b/src/vnet/ip/reass/ip6_full_reass.h @@ -0,0 +1,54 @@ +/* + * Copyright (c) 2017 Cisco and/or its affiliates. + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at: + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +/** + * @file + * @brief IPv6 Reassembly. + * + * This file contains the source code for IPv6 reassembly. + */ + +#ifndef __included_ip6_full_reass_h__ +#define __included_ip6_full_reass_h__ + +#include +#include + +/** + * @brief set ip6 reassembly configuration + */ +vnet_api_error_t ip6_full_reass_set (u32 timeout_ms, u32 max_reassemblies, + u32 max_reassembly_length, + u32 expire_walk_interval_ms); + +/** + * @brief get ip6 reassembly configuration + */ +vnet_api_error_t ip6_full_reass_get (u32 * timeout_ms, u32 * max_reassemblies, + u32 * max_reassembly_length, + u32 * expire_walk_interval_ms); + +vnet_api_error_t ip6_full_reass_enable_disable (u32 sw_if_index, + u8 enable_disable); + +#endif /* __included_ip6_full_reass_h */ + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ -- cgit 1.2.3-korg