diff options
Diffstat (limited to 'src/vnet/ip/reass/ip4_full_reass.c')
| -rw-r--r-- | src/vnet/ip/reass/ip4_full_reass.c | 1818 |
1 files changed, 1818 insertions, 0 deletions
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 <vppinfra/vec.h> +#include <vnet/vnet.h> +#include <vnet/ip/ip.h> +#include <vppinfra/fifo.h> +#include <vppinfra/bihash_16_8.h> +#include <vnet/ip/reass/ip4_full_reass.h> +#include <stddef.h> + +#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: + */ |