diff options
Diffstat (limited to 'src/vnet/ip/reass/ip4_sv_reass.c')
| -rw-r--r-- | src/vnet/ip/reass/ip4_sv_reass.c | 1199 |
1 files changed, 1199 insertions, 0 deletions
diff --git a/src/vnet/ip/reass/ip4_sv_reass.c b/src/vnet/ip/reass/ip4_sv_reass.c new file mode 100644 index 00000000000..25119e8d0a7 --- /dev/null +++ b/src/vnet/ip/reass/ip4_sv_reass.c @@ -0,0 +1,1199 @@ +/* + * 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 Shallow Virtual Reassembly. + * + * This file contains the source code for IPv4 Shallow Virtual reassembly. + */ + +#include <vppinfra/vec.h> +#include <vnet/vnet.h> +#include <vnet/ip/ip.h> +#include <vnet/ip/ip4_to_ip6.h> +#include <vppinfra/fifo.h> +#include <vppinfra/bihash_16_8.h> +#include <vnet/ip/reass/ip4_sv_reass.h> + +#define MSEC_PER_SEC 1000 +#define IP4_SV_REASS_TIMEOUT_DEFAULT_MS 100 +#define IP4_SV_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS 10000 // 10 seconds default +#define IP4_SV_REASS_MAX_REASSEMBLIES_DEFAULT 1024 +#define IP4_SV_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT 3 +#define IP4_SV_REASS_HT_LOAD_FACTOR (0.75) + +typedef enum +{ + IP4_SV_REASS_RC_OK, + IP4_SV_REASS_RC_TOO_MANY_FRAGMENTS, + IP4_SV_REASS_RC_UNSUPP_IP_PROTO, +} ip4_sv_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_sv_reass_key_t; + +typedef union +{ + struct + { + u32 reass_index; + u32 thread_index; + }; + u64 as_u64; +} ip4_sv_reass_val_t; + +typedef union +{ + struct + { + ip4_sv_reass_key_t k; + ip4_sv_reass_val_t v; + }; + clib_bihash_kv_16_8_t kv; +} ip4_sv_reass_kv_t; + +typedef struct +{ + // hash table key + ip4_sv_reass_key_t key; + // time when last packet was received + f64 last_heard; + // internal id of this reassembly + u64 id; + // trace operation counter + u32 trace_op_counter; + // minimum fragment length for this reassembly - used to estimate MTU + u16 min_fragment_length; + // buffer indexes of buffers in this reassembly in chronological order - + // including overlaps and duplicate fragments + u32 *cached_buffers; + // set to true when this reassembly is completed + bool is_complete; + // ip protocol + u8 ip_proto; + // l4 src port + u16 l4_src_port; + // l4 dst port + u16 l4_dst_port; + u32 next_index; + // lru indexes + u32 lru_prev; + u32 lru_next; +} ip4_sv_reass_t; + +typedef struct +{ + ip4_sv_reass_t *pool; + u32 reass_n; + u32 id_counter; + clib_spinlock_t lock; + // lru indexes + u32 lru_first; + u32 lru_last; + +} ip4_sv_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_sv_reass_per_thread_t *per_thread_data; + + // convenience + vlib_main_t *vlib_main; + vnet_main_t *vnet_main; + + // node index of ip4-drop node + u32 ip4_drop_idx; + u32 ip4_sv_reass_expire_node_idx; + + /** Worker handoff */ + u32 fq_index; + u32 fq_feature_index; + + // reference count for enabling/disabling feature + u32 feature_use_refcount; + +} ip4_sv_reass_main_t; + +extern ip4_sv_reass_main_t ip4_sv_reass_main; + +#ifndef CLIB_MARCH_VARIANT +ip4_sv_reass_main_t ip4_sv_reass_main; +#endif /* CLIB_MARCH_VARIANT */ + +typedef enum +{ + IP4_SV_REASSEMBLY_NEXT_INPUT, + IP4_SV_REASSEMBLY_NEXT_DROP, + IP4_SV_REASSEMBLY_NEXT_HANDOFF, + IP4_SV_REASSEMBLY_N_NEXT, +} ip4_sv_reass_next_t; + +typedef enum +{ + REASS_FRAGMENT_CACHE, + REASS_FINISH, + REASS_FRAGMENT_FORWARD, +} ip4_sv_reass_trace_operation_e; + +typedef struct +{ + ip4_sv_reass_trace_operation_e action; + u32 reass_id; + u32 op_id; + u8 ip_proto; + u16 l4_src_port; + u16 l4_dst_port; +} ip4_sv_reass_trace_t; + +extern vlib_node_registration_t ip4_sv_reass_node; +extern vlib_node_registration_t ip4_sv_reass_node_feature; + +static u8 * +format_ip4_sv_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_sv_reass_trace_t *t = va_arg (*args, ip4_sv_reass_trace_t *); + s = format (s, "reass id: %u, op id: %u ", t->reass_id, t->op_id); + switch (t->action) + { + case REASS_FRAGMENT_CACHE: + s = format (s, "[cached]"); + break; + case REASS_FINISH: + s = + format (s, "[finish, ip proto=%u, src_port=%u, dst_port=%u]", + t->ip_proto, clib_net_to_host_u16 (t->l4_src_port), + clib_net_to_host_u16 (t->l4_dst_port)); + break; + case REASS_FRAGMENT_FORWARD: + s = + format (s, "[forward, ip proto=%u, src_port=%u, dst_port=%u]", + t->ip_proto, clib_net_to_host_u16 (t->l4_src_port), + clib_net_to_host_u16 (t->l4_dst_port)); + break; + } + return s; +} + +static void +ip4_sv_reass_add_trace (vlib_main_t * vm, vlib_node_runtime_t * node, + ip4_sv_reass_main_t * rm, ip4_sv_reass_t * reass, + u32 bi, ip4_sv_reass_trace_operation_e action, + u32 ip_proto, u16 l4_src_port, u16 l4_dst_port) +{ + vlib_buffer_t *b = vlib_get_buffer (vm, bi); + ip4_sv_reass_trace_t *t = vlib_add_trace (vm, node, b, sizeof (t[0])); + t->reass_id = reass->id; + t->action = action; + t->op_id = reass->trace_op_counter; + t->ip_proto = ip_proto; + t->l4_src_port = l4_src_port; + t->l4_dst_port = l4_dst_port; + ++reass->trace_op_counter; +#if 0 + static u8 *s = NULL; + s = format (s, "%U", format_ip4_sv_reass_trace, NULL, NULL, t); + printf ("%.*s\n", vec_len (s), s); + fflush (stdout); + vec_reset_length (s); +#endif +} + + +always_inline void +ip4_sv_reass_free (vlib_main_t * vm, ip4_sv_reass_main_t * rm, + ip4_sv_reass_per_thread_t * rt, ip4_sv_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); + vlib_buffer_free (vm, reass->cached_buffers, + vec_len (reass->cached_buffers)); + vec_free (reass->cached_buffers); + reass->cached_buffers = NULL; + if (~0 != reass->lru_prev) + { + ip4_sv_reass_t *lru_prev = + pool_elt_at_index (rt->pool, reass->lru_prev); + lru_prev->lru_next = reass->lru_next; + } + if (~0 != reass->lru_next) + { + ip4_sv_reass_t *lru_next = + pool_elt_at_index (rt->pool, reass->lru_next); + lru_next->lru_prev = reass->lru_prev; + } + if (rt->lru_first == reass - rt->pool) + { + rt->lru_first = reass->lru_next; + } + if (rt->lru_last == reass - rt->pool) + { + rt->lru_last = reass->lru_prev; + } + pool_put (rt->pool, reass); + --rt->reass_n; +} + +always_inline void +ip4_sv_reass_init (ip4_sv_reass_t * reass) +{ + reass->cached_buffers = NULL; + reass->is_complete = false; +} + +always_inline ip4_sv_reass_t * +ip4_sv_reass_find_or_create (vlib_main_t * vm, ip4_sv_reass_main_t * rm, + ip4_sv_reass_per_thread_t * rt, + ip4_sv_reass_kv_t * kv, u8 * do_handoff) +{ + ip4_sv_reass_t *reass = NULL; + f64 now = vlib_time_now (rm->vlib_main); + + if (!clib_bihash_search_16_8 + (&rm->hash, (clib_bihash_kv_16_8_t *) kv, (clib_bihash_kv_16_8_t *) kv)) + { + if (vm->thread_index != kv->v.thread_index) + { + *do_handoff = 1; + return NULL; + } + reass = pool_elt_at_index (rt->pool, kv->v.reass_index); + + if (now > reass->last_heard + rm->timeout) + { + ip4_sv_reass_free (vm, rm, rt, reass); + reass = NULL; + } + } + + if (reass) + { + reass->last_heard = now; + return reass; + } + + if (rt->reass_n >= rm->max_reass_n && rm->max_reass_n) + { + reass = pool_elt_at_index (rt->pool, rt->lru_last); + ip4_sv_reass_free (vm, rm, rt, reass); + } + + pool_get (rt->pool, reass); + clib_memset (reass, 0, sizeof (*reass)); + reass->id = ((u64) vm->thread_index * 1000000000) + rt->id_counter; + ++rt->id_counter; + ip4_sv_reass_init (reass); + ++rt->reass_n; + reass->lru_prev = reass->lru_next = ~0; + + if (~0 != rt->lru_last) + { + ip4_sv_reass_t *lru_last = pool_elt_at_index (rt->pool, rt->lru_last); + reass->lru_prev = rt->lru_last; + lru_last->lru_next = rt->lru_last = reass - rt->pool; + } + + if (~0 == rt->lru_first) + { + rt->lru_first = rt->lru_last = reass - rt->pool; + } + + 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.thread_index = vm->thread_index; + reass->last_heard = now; + + if (clib_bihash_add_del_16_8 (&rm->hash, (clib_bihash_kv_16_8_t *) kv, 1)) + { + ip4_sv_reass_free (vm, rm, rt, reass); + reass = NULL; + } + + return reass; +} + +always_inline ip4_sv_reass_rc_t +ip4_sv_reass_update (vlib_main_t * vm, vlib_node_runtime_t * node, + ip4_sv_reass_main_t * rm, ip4_sv_reass_per_thread_t * rt, + ip4_sv_reass_t * reass, u32 bi0) +{ + vlib_buffer_t *fb = vlib_get_buffer (vm, bi0); + ip4_sv_reass_rc_t rc = IP4_SV_REASS_RC_OK; + ip4_header_t *fip = vlib_buffer_get_current (fb); + const u32 fragment_first = ip4_get_fragment_offset_bytes (fip); + if (0 == fragment_first) + { + reass->ip_proto = fip->protocol; + reass->l4_src_port = ip4_get_port (fip, 1); + reass->l4_dst_port = ip4_get_port (fip, 0); + if (!reass->l4_src_port || !reass->l4_dst_port) + return IP4_SV_REASS_RC_UNSUPP_IP_PROTO; + reass->is_complete = true; + vlib_buffer_t *b0 = vlib_get_buffer (vm, bi0); + if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) + { + ip4_sv_reass_add_trace (vm, node, rm, reass, bi0, REASS_FINISH, + reass->ip_proto, reass->l4_src_port, + reass->l4_dst_port); + } + } + vec_add1 (reass->cached_buffers, bi0); + if (!reass->is_complete) + { + if (PREDICT_FALSE (fb->flags & VLIB_BUFFER_IS_TRACED)) + { + ip4_sv_reass_add_trace (vm, node, rm, reass, bi0, + REASS_FRAGMENT_CACHE, ~0, ~0, ~0); + } + if (vec_len (reass->cached_buffers) > rm->max_reass_len) + { + rc = IP4_SV_REASS_RC_TOO_MANY_FRAGMENTS; + } + } + return rc; +} + +always_inline uword +ip4_sv_reass_inline (vlib_main_t * vm, vlib_node_runtime_t * node, + vlib_frame_t * frame, bool is_feature, bool is_custom) +{ + u32 *from = vlib_frame_vector_args (frame); + u32 n_left_from, n_left_to_next, *to_next, next_index; + ip4_sv_reass_main_t *rm = &ip4_sv_reass_main; + ip4_sv_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 regular packet - no fragmentation + vnet_buffer (b0)->ip.reass.ip_proto = ip0->protocol; + vnet_buffer (b0)->ip.reass.l4_src_port = ip4_get_port (ip0, 1); + vnet_buffer (b0)->ip.reass.l4_dst_port = ip4_get_port (ip0, 0); + next0 = IP4_SV_REASSEMBLY_NEXT_INPUT; + 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_SV_REASSEMBLY_NEXT_DROP; + error0 = IP4_ERROR_REASS_MALFORMED_PACKET; + goto packet_enqueue; + } + ip4_sv_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_sv_reass_t *reass = + ip4_sv_reass_find_or_create (vm, rm, rt, &kv, &do_handoff); + + if (PREDICT_FALSE (do_handoff)) + { + next0 = IP4_SV_REASSEMBLY_NEXT_HANDOFF; + vnet_buffer (b0)->ip.reass.owner_thread_index = + kv.v.thread_index; + goto packet_enqueue; + } + + if (!reass) + { + next0 = IP4_SV_REASSEMBLY_NEXT_DROP; + error0 = IP4_ERROR_REASS_LIMIT_REACHED; + goto packet_enqueue; + } + + if (reass->is_complete) + { + vnet_buffer (b0)->ip.reass.ip_proto = reass->ip_proto; + vnet_buffer (b0)->ip.reass.l4_src_port = reass->l4_src_port; + vnet_buffer (b0)->ip.reass.l4_dst_port = reass->l4_dst_port; + next0 = IP4_SV_REASSEMBLY_NEXT_INPUT; + error0 = IP4_ERROR_NONE; + if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) + { + ip4_sv_reass_add_trace (vm, node, rm, reass, bi0, + REASS_FRAGMENT_FORWARD, + reass->ip_proto, + reass->l4_src_port, + reass->l4_dst_port); + } + goto packet_enqueue; + } + + ip4_sv_reass_rc_t rc = + ip4_sv_reass_update (vm, node, rm, rt, reass, bi0); + switch (rc) + { + case IP4_SV_REASS_RC_OK: + /* nothing to do here */ + break; + case IP4_SV_REASS_RC_TOO_MANY_FRAGMENTS: + vlib_node_increment_counter (vm, node->node_index, + IP4_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG, + 1); + ip4_sv_reass_free (vm, rm, rt, reass); + goto next_packet; + break; + case IP4_SV_REASS_RC_UNSUPP_IP_PROTO: + vlib_node_increment_counter (vm, node->node_index, + IP4_ERROR_REASS_FRAGMENT_CHAIN_TOO_LONG, + 1); + ip4_sv_reass_free (vm, rm, rt, reass); + goto next_packet; + break; + } + if (reass->is_complete) + { + u32 idx; + vec_foreach_index (idx, reass->cached_buffers) + { + u32 bi0 = vec_elt (reass->cached_buffers, idx); + vlib_buffer_t *b0 = vlib_get_buffer (vm, bi0); + u32 next0 = IP4_SV_REASSEMBLY_NEXT_INPUT; + if (is_feature) + { + vnet_feature_next (&next0, b0); + } + if (is_custom) + { + next0 = vnet_buffer (b0)->ip.reass.next_index; + } + if (0 == n_left_to_next) + { + vlib_put_next_frame (vm, node, next_index, + n_left_to_next); + vlib_get_next_frame (vm, node, next_index, to_next, + n_left_to_next); + } + to_next[0] = bi0; + to_next += 1; + n_left_to_next -= 1; + vnet_buffer (b0)->ip.reass.ip_proto = reass->ip_proto; + vnet_buffer (b0)->ip.reass.l4_src_port = reass->l4_src_port; + vnet_buffer (b0)->ip.reass.l4_dst_port = reass->l4_dst_port; + if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) + { + ip4_sv_reass_add_trace (vm, node, rm, reass, bi0, + REASS_FRAGMENT_FORWARD, + reass->ip_proto, + reass->l4_src_port, + reass->l4_dst_port); + } + vlib_validate_buffer_enqueue_x1 (vm, node, next_index, + to_next, n_left_to_next, bi0, + next0); + } + _vec_len (reass->cached_buffers) = 0; // buffers are owned by frame now + } + goto next_packet; + + packet_enqueue: + b0->error = node->errors[error0]; + + to_next[0] = bi0; + to_next += 1; + n_left_to_next -= 1; + if (is_feature && IP4_ERROR_NONE == error0) + { + b0 = vlib_get_buffer (vm, bi0); + vnet_feature_next (&next0, b0); + } + if (is_custom) + { + next0 = vnet_buffer (b0)->ip.reass.next_index; + } + vlib_validate_buffer_enqueue_x1 (vm, node, next_index, + to_next, n_left_to_next, + bi0, 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 *ip4_sv_reass_error_strings[] = { +#define _(sym, string) string, + foreach_ip4_error +#undef _ +}; + +VLIB_NODE_FN (ip4_sv_reass_node) (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * frame) +{ + return ip4_sv_reass_inline (vm, node, frame, false /* is_feature */ , + false /* is_custom */ ); +} + +/* *INDENT-OFF* */ +VLIB_REGISTER_NODE (ip4_sv_reass_node) = { + .name = "ip4-sv-reassembly", + .vector_size = sizeof (u32), + .format_trace = format_ip4_sv_reass_trace, + .n_errors = ARRAY_LEN (ip4_sv_reass_error_strings), + .error_strings = ip4_sv_reass_error_strings, + .n_next_nodes = IP4_SV_REASSEMBLY_N_NEXT, + .next_nodes = + { + [IP4_SV_REASSEMBLY_NEXT_INPUT] = "ip4-input", + [IP4_SV_REASSEMBLY_NEXT_DROP] = "ip4-drop", + [IP4_SV_REASSEMBLY_NEXT_HANDOFF] = "ip4-sv-reassembly-handoff", + + }, +}; +/* *INDENT-ON* */ + +VLIB_NODE_FN (ip4_sv_reass_node_feature) (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * frame) +{ + return ip4_sv_reass_inline (vm, node, frame, true /* is_feature */ , + false /* is_custom */ ); +} + +/* *INDENT-OFF* */ +VLIB_REGISTER_NODE (ip4_sv_reass_node_feature) = { + .name = "ip4-sv-reassembly-feature", + .vector_size = sizeof (u32), + .format_trace = format_ip4_sv_reass_trace, + .n_errors = ARRAY_LEN (ip4_sv_reass_error_strings), + .error_strings = ip4_sv_reass_error_strings, + .n_next_nodes = IP4_SV_REASSEMBLY_N_NEXT, + .next_nodes = + { + [IP4_SV_REASSEMBLY_NEXT_INPUT] = "ip4-input", + [IP4_SV_REASSEMBLY_NEXT_DROP] = "ip4-drop", + [IP4_SV_REASSEMBLY_NEXT_HANDOFF] = "ip4-sv-reass-feature-hoff", + }, +}; +/* *INDENT-ON* */ + +/* *INDENT-OFF* */ +VNET_FEATURE_INIT (ip4_sv_reass_feature) = { + .arc_name = "ip4-unicast", + .node_name = "ip4-sv-reassembly-feature", + .runs_before = VNET_FEATURES ("ip4-lookup"), + .runs_after = 0, +}; +/* *INDENT-ON* */ + +/* *INDENT-OFF* */ +VLIB_REGISTER_NODE (ip4_sv_reass_custom_node) = { + .name = "ip4-sv-reassembly-custom-next", + .vector_size = sizeof (u32), + .format_trace = format_ip4_sv_reass_trace, + .n_errors = ARRAY_LEN (ip4_sv_reass_error_strings), + .error_strings = ip4_sv_reass_error_strings, + .n_next_nodes = IP4_SV_REASSEMBLY_N_NEXT, + .next_nodes = + { + [IP4_SV_REASSEMBLY_NEXT_INPUT] = "ip4-input", + [IP4_SV_REASSEMBLY_NEXT_DROP] = "ip4-drop", + [IP4_SV_REASSEMBLY_NEXT_HANDOFF] = "ip4-sv-reassembly-handoff", + + }, +}; +/* *INDENT-ON* */ + +VLIB_NODE_FN (ip4_sv_reass_custom_node) (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * frame) +{ + return ip4_sv_reass_inline (vm, node, frame, false /* is_feature */ , + true /* is_custom */ ); +} + +#ifndef CLIB_MARCH_VARIANT +always_inline u32 +ip4_sv_reass_get_nbuckets () +{ + ip4_sv_reass_main_t *rm = &ip4_sv_reass_main; + u32 nbuckets; + u8 i; + + nbuckets = (u32) (rm->max_reass_n / IP4_SV_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_sv_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_sv_reass_set_params (u32 timeout_ms, u32 max_reassemblies, + u32 max_reassembly_length, + u32 expire_walk_interval_ms) +{ + ip4_sv_reass_main.timeout_ms = timeout_ms; + ip4_sv_reass_main.timeout = (f64) timeout_ms / (f64) MSEC_PER_SEC; + ip4_sv_reass_main.max_reass_n = max_reassemblies; + ip4_sv_reass_main.max_reass_len = max_reassembly_length; + ip4_sv_reass_main.expire_walk_interval_ms = expire_walk_interval_ms; +} + +vnet_api_error_t +ip4_sv_reass_set (u32 timeout_ms, u32 max_reassemblies, + u32 max_reassembly_length, u32 expire_walk_interval_ms) +{ + u32 old_nbuckets = ip4_sv_reass_get_nbuckets (); + ip4_sv_reass_set_params (timeout_ms, max_reassemblies, + max_reassembly_length, expire_walk_interval_ms); + vlib_process_signal_event (ip4_sv_reass_main.vlib_main, + ip4_sv_reass_main.ip4_sv_reass_expire_node_idx, + IP4_EVENT_CONFIG_CHANGED, 0); + u32 new_nbuckets = ip4_sv_reass_get_nbuckets (); + if (ip4_sv_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_sv_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_sv_reass_main.hash); + clib_memcpy_fast (&ip4_sv_reass_main.hash, &new_hash, + sizeof (ip4_sv_reass_main.hash)); + clib_bihash_copied (&ip4_sv_reass_main.hash, &new_hash); + } + } + return 0; +} + +vnet_api_error_t +ip4_sv_reass_get (u32 * timeout_ms, u32 * max_reassemblies, + u32 * max_reassembly_length, u32 * expire_walk_interval_ms) +{ + *timeout_ms = ip4_sv_reass_main.timeout_ms; + *max_reassemblies = ip4_sv_reass_main.max_reass_n; + *max_reassembly_length = ip4_sv_reass_main.max_reass_len; + *expire_walk_interval_ms = ip4_sv_reass_main.expire_walk_interval_ms; + return 0; +} + +static clib_error_t * +ip4_sv_reass_init_function (vlib_main_t * vm) +{ + ip4_sv_reass_main_t *rm = &ip4_sv_reass_main; + clib_error_t *error = 0; + u32 nbuckets; + vlib_node_t *node; + + rm->vlib_main = vm; + rm->vnet_main = vnet_get_main (); + + vec_validate (rm->per_thread_data, vlib_num_workers ()); + ip4_sv_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); + rt->lru_first = rt->lru_last = ~0; + } + + node = vlib_get_node_by_name (vm, (u8 *) "ip4-sv-reassembly-expire-walk"); + ASSERT (node); + rm->ip4_sv_reass_expire_node_idx = node->index; + + ip4_sv_reass_set_params (IP4_SV_REASS_TIMEOUT_DEFAULT_MS, + IP4_SV_REASS_MAX_REASSEMBLIES_DEFAULT, + IP4_SV_REASS_MAX_REASSEMBLY_LENGTH_DEFAULT, + IP4_SV_REASS_EXPIRE_WALK_INTERVAL_DEFAULT_MS); + + nbuckets = ip4_sv_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_sv_reass_node.index, 0); + rm->fq_feature_index = + vlib_frame_queue_main_init (ip4_sv_reass_node_feature.index, 0); + + return error; +} + +VLIB_INIT_FUNCTION (ip4_sv_reass_init_function); +#endif /* CLIB_MARCH_VARIANT */ + +static uword +ip4_sv_reass_walk_expired (vlib_main_t * vm, + vlib_node_runtime_t * node, vlib_frame_t * f) +{ + ip4_sv_reass_main_t *rm = &ip4_sv_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_sv_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_sv_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_sv_reass_t *reass = pool_elt_at_index (rt->pool, i[0]); + ip4_sv_reass_free (vm, rm, rt, reass); + } + /* *INDENT-ON* */ + + clib_spinlock_unlock (&rt->lock); + } + + vec_free (pool_indexes_to_free); + if (event_data) + { + _vec_len (event_data) = 0; + } + } + + return 0; +} + +/* *INDENT-OFF* */ +VLIB_REGISTER_NODE (ip4_sv_reass_expire_node) = { + .function = ip4_sv_reass_walk_expired, + .type = VLIB_NODE_TYPE_PROCESS, + .name = "ip4-sv-reassembly-expire-walk", + .format_trace = format_ip4_sv_reass_trace, + .n_errors = ARRAY_LEN (ip4_sv_reass_error_strings), + .error_strings = ip4_sv_reass_error_strings, + +}; +/* *INDENT-ON* */ + +static u8 * +format_ip4_sv_reass_key (u8 * s, va_list * args) +{ + ip4_sv_reass_key_t *key = va_arg (*args, ip4_sv_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_sv_reass (u8 * s, va_list * args) +{ + vlib_main_t *vm = va_arg (*args, vlib_main_t *); + ip4_sv_reass_t *reass = va_arg (*args, ip4_sv_reass_t *); + + s = format (s, "ID: %lu, key: %U trace_op_counter: %u\n", + reass->id, format_ip4_sv_reass_key, &reass->key, + reass->trace_op_counter); + + vlib_buffer_t *b; + u32 *bip; + u32 counter = 0; + vec_foreach (bip, reass->cached_buffers) + { + u32 bi = *bip; + do + { + b = vlib_get_buffer (vm, bi); + s = format (s, " #%03u: bi: %u, ", counter, bi); + ++counter; + bi = b->next_buffer; + } + while (b->flags & VLIB_BUFFER_NEXT_PRESENT); + } + 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_sv_reass_main_t *rm = &ip4_sv_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_sv_reass_t *reass; + uword thread_index; + const uword nthreads = vlib_num_workers () + 1; + for (thread_index = 0; thread_index < nthreads; ++thread_index) + { + ip4_sv_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_sv_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_sv_reass_cmd, static) = { + .path = "show ip4-sv-reassembly", + .short_help = "show ip4-sv-reassembly [details]", + .function = show_ip4_reass, +}; +/* *INDENT-ON* */ + +#ifndef CLIB_MARCH_VARIANT +vnet_api_error_t +ip4_sv_reass_enable_disable (u32 sw_if_index, u8 enable_disable) +{ + return vnet_feature_enable_disable ("ip4-unicast", + "ip4-sv-reassembly-feature", + sw_if_index, enable_disable, 0, 0); +} +#endif /* CLIB_MARCH_VARIANT */ + + +#define foreach_ip4_sv_reass_handoff_error \ +_(CONGESTION_DROP, "congestion drop") + + +typedef enum +{ +#define _(sym,str) IP4_SV_REASSEMBLY_HANDOFF_ERROR_##sym, + foreach_ip4_sv_reass_handoff_error +#undef _ + IP4_SV_REASSEMBLY_HANDOFF_N_ERROR, +} ip4_sv_reass_handoff_error_t; + +static char *ip4_sv_reass_handoff_error_strings[] = { +#define _(sym,string) string, + foreach_ip4_sv_reass_handoff_error +#undef _ +}; + +typedef struct +{ + u32 next_worker_index; +} ip4_sv_reass_handoff_trace_t; + +static u8 * +format_ip4_sv_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_sv_reass_handoff_trace_t *t = + va_arg (*args, ip4_sv_reass_handoff_trace_t *); + + s = + format (s, "ip4-sv-reassembly-handoff: next-worker %d", + t->next_worker_index); + + return s; +} + +always_inline uword +ip4_sv_reass_handoff_node_inline (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * frame, bool is_feature) +{ + ip4_sv_reass_main_t *rm = &ip4_sv_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] = 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_sv_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_SV_REASSEMBLY_HANDOFF_ERROR_CONGESTION_DROP, + frame->n_vectors - n_enq); + return frame->n_vectors; +} + +VLIB_NODE_FN (ip4_sv_reass_handoff_node) (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * frame) +{ + return ip4_sv_reass_handoff_node_inline (vm, node, frame, + false /* is_feature */ ); +} + + +/* *INDENT-OFF* */ +VLIB_REGISTER_NODE (ip4_sv_reass_handoff_node) = { + .name = "ip4-sv-reassembly-handoff", + .vector_size = sizeof (u32), + .n_errors = ARRAY_LEN(ip4_sv_reass_handoff_error_strings), + .error_strings = ip4_sv_reass_handoff_error_strings, + .format_trace = format_ip4_sv_reass_handoff_trace, + + .n_next_nodes = 1, + + .next_nodes = { + [0] = "error-drop", + }, +}; +/* *INDENT-ON* */ + + +/* *INDENT-OFF* */ +VLIB_NODE_FN (ip4_sv_reass_feature_handoff_node) (vlib_main_t * vm, + vlib_node_runtime_t * + node, + vlib_frame_t * frame) +{ + return ip4_sv_reass_handoff_node_inline (vm, node, frame, + true /* is_feature */ ); +} +/* *INDENT-ON* */ + + +/* *INDENT-OFF* */ +VLIB_REGISTER_NODE (ip4_sv_reass_feature_handoff_node) = { + .name = "ip4-sv-reass-feature-hoff", + .vector_size = sizeof (u32), + .n_errors = ARRAY_LEN(ip4_sv_reass_handoff_error_strings), + .error_strings = ip4_sv_reass_handoff_error_strings, + .format_trace = format_ip4_sv_reass_handoff_trace, + + .n_next_nodes = 1, + + .next_nodes = { + [0] = "error-drop", + }, +}; +/* *INDENT-ON* */ + +#ifndef CLIB_MARCH_VARIANT +int +ip4_sv_reass_enable_disable_with_refcnt (u32 sw_if_index, int is_enable) +{ + ip4_sv_reass_main_t *rm = &ip4_sv_reass_main; + if (is_enable) + { + if (!rm->feature_use_refcount) + { + ++rm->feature_use_refcount; + return vnet_feature_enable_disable ("ip4-unicast", + "ip4-sv-reassembly-feature", + sw_if_index, 1, 0, 0); + } + ++rm->feature_use_refcount; + } + else + { + --rm->feature_use_refcount; + if (!rm->feature_use_refcount) + return vnet_feature_enable_disable ("ip4-unicast", + "ip4-sv-reassembly-feature", + sw_if_index, 0, 0, 0); + } + return -1; +} + +uword +ip4_sv_reass_custom_register_next_node (uword node_index) +{ + return vlib_node_add_next (vlib_get_main (), ip4_sv_reass_custom_node.index, + node_index); +} +#endif + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ |