diff options
Diffstat (limited to 'src/vnet/ip/ip6_reassembly.c')
| -rw-r--r-- | src/vnet/ip/ip6_reassembly.c | 1795 |
1 files changed, 0 insertions, 1795 deletions
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 <vppinfra/vec.h> -#include <vnet/vnet.h> -#include <vnet/ip/ip.h> -#include <vppinfra/bihash_48_8.h> -#include <vnet/ip/ip6_reassembly.h> - -#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: - */ |