/* * 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 #include #include #include #include #include #include #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; u8 icmp_type_or_tcp_flags; u32 tcp_ack_number; u32 tcp_seq_number; // 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 - per interface u32 *feature_use_refcount_per_intf; // reference count for enabling/disabling feature - per interface u32 *output_feature_use_refcount_per_intf; } 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, REASS_PASSTHROUGH, } 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 *); if (REASS_PASSTHROUGH != t->action) { 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; case REASS_PASSTHROUGH: s = format (s, "[not-fragmented]"); 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])); if (reass) { t->reass_id = reass->id; t->op_id = reass->trace_op_counter; ++reass->trace_op_counter; } t->action = action; t->ip_proto = ip_proto; t->l4_src_port = l4_src_port; t->l4_dst_port = l4_dst_port; #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_header_t * ip0, ip4_sv_reass_t * reass, u32 bi0) { vlib_buffer_t *b0 = vlib_get_buffer (vm, bi0); ip4_sv_reass_rc_t rc = IP4_SV_REASS_RC_OK; const u32 fragment_first = ip4_get_fragment_offset_bytes (ip0); if (0 == fragment_first) { reass->ip_proto = ip0->protocol; reass->l4_src_port = ip4_get_port (ip0, 1); reass->l4_dst_port = ip4_get_port (ip0, 0); if (!reass->l4_src_port || !reass->l4_dst_port) return IP4_SV_REASS_RC_UNSUPP_IP_PROTO; if (IP_PROTOCOL_TCP == reass->ip_proto) { reass->icmp_type_or_tcp_flags = ((tcp_header_t *) (ip0 + 1))->flags; reass->tcp_ack_number = ((tcp_header_t *) (ip0 + 1))->ack_number; reass->tcp_seq_number = ((tcp_header_t *) (ip0 + 1))->seq_number; } else if (IP_PROTOCOL_ICMP == reass->ip_proto) { reass->icmp_type_or_tcp_flags = ((icmp46_header_t *) (ip0 + 1))->type; } 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 (b0->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_output_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 = (ip4_header_t *) u8_ptr_add (vlib_buffer_get_current (b0), is_output_feature * vnet_buffer (b0)-> ip.save_rewrite_length); if (!ip4_get_fragment_more (ip0) && !ip4_get_fragment_offset (ip0)) { // this is a regular packet - no fragmentation if (is_custom) { next0 = vnet_buffer (b0)->ip.reass.next_index; } else { next0 = IP4_SV_REASSEMBLY_NEXT_INPUT; } vnet_buffer (b0)->ip.reass.save_rewrite_length = vnet_buffer (b0)->ip.save_rewrite_length; vnet_buffer (b0)->ip.reass.is_non_first_fragment = 0; vnet_buffer (b0)->ip.reass.ip_proto = ip0->protocol; if (IP_PROTOCOL_TCP == ip0->protocol) { vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags = ((tcp_header_t *) (ip0 + 1))->flags; vnet_buffer (b0)->ip.reass.tcp_ack_number = ((tcp_header_t *) (ip0 + 1))->ack_number; vnet_buffer (b0)->ip.reass.tcp_seq_number = ((tcp_header_t *) (ip0 + 1))->seq_number; } else if (IP_PROTOCOL_ICMP == ip0->protocol) { vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags = ((icmp46_header_t *) (ip0 + 1))->type; } 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); if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) { ip4_sv_reass_add_trace (vm, node, rm, NULL, bi0, REASS_PASSTHROUGH, vnet_buffer (b0)->ip.reass.ip_proto, vnet_buffer (b0)->ip. reass.l4_src_port, vnet_buffer (b0)->ip. reass.l4_dst_port); } 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) { if (is_custom) { next0 = vnet_buffer (b0)->ip.reass.next_index; } else { next0 = IP4_SV_REASSEMBLY_NEXT_INPUT; } vnet_buffer (b0)->ip.reass.save_rewrite_length = vnet_buffer (b0)->ip.save_rewrite_length; vnet_buffer (b0)->ip.reass.is_non_first_fragment = ! !fragment_first; vnet_buffer (b0)->ip.reass.ip_proto = reass->ip_proto; vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags = reass->icmp_type_or_tcp_flags; vnet_buffer (b0)->ip.reass.tcp_ack_number = reass->tcp_ack_number; vnet_buffer (b0)->ip.reass.tcp_seq_number = reass->tcp_seq_number; vnet_buffer (b0)->ip.reass.l4_src_port = reass->l4_src_port; vnet_buffer (b0)->ip.reass.l4_dst_port = reass->l4_dst_port; 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, ip0, 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; ASSERT (vnet_buffer (b0)->ip.save_rewrite_length < (2 << 14)); vnet_buffer (b0)->ip.reass.save_rewrite_length = vnet_buffer (b0)->ip.save_rewrite_length; vnet_buffer (b0)->ip.reass.is_non_first_fragment = ! !ip4_get_fragment_offset (vlib_buffer_get_current (b0)); vnet_buffer (b0)->ip.reass.ip_proto = reass->ip_proto; vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags = reass->icmp_type_or_tcp_flags; vnet_buffer (b0)->ip.reass.tcp_ack_number = reass->tcp_ack_number; vnet_buffer (b0)->ip.reass.tcp_seq_number = reass->tcp_seq_number; 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); } 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_output_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_output_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* */ VLIB_NODE_FN (ip4_sv_reass_node_output_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 */ , true /* is_output_feature */ , false /* is_custom */ ); } /* *INDENT-OFF* */ VLIB_REGISTER_NODE (ip4_sv_reass_node_output_feature) = { .name = "ip4-sv-reassembly-output-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_output_feature) = { .arc_name = "ip4-output", .node_name = "ip4-sv-reassembly-output-feature", .runs_before = 0, .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 */ , false /* is_output_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 int 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; } return (BIHASH_WALK_CONTINUE); } 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); rm->feature_use_refcount_per_intf = NULL; rm->output_feature_use_refcount_per_intf = NULL; 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 ip4_sv_reass_enable_disable_with_refcnt (sw_if_index, enable_disable); } #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; vec_validate (rm->feature_use_refcount_per_intf, sw_if_index); if (is_enable) { if (!rm->feature_use_refcount_per_intf[sw_if_index]) { ++rm->feature_use_refcount_per_intf[sw_if_index]; return vnet_feature_enable_disable ("ip4-unicast", "ip4-sv-reassembly-feature", sw_if_index, 1, 0, 0); } ++rm->feature_use_refcount_per_intf[sw_if_index]; } else { if (rm->feature_use_refcount_per_intf[sw_if_index]) --rm->feature_use_refcount_per_intf[sw_if_index]; if (!rm->feature_use_refcount_per_intf[sw_if_index]) return vnet_feature_enable_disable ("ip4-unicast", "ip4-sv-reassembly-feature", sw_if_index, 0, 0, 0); } return 0; } 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); } int ip4_sv_reass_output_enable_disable_with_refcnt (u32 sw_if_index, int is_enable) { ip4_sv_reass_main_t *rm = &ip4_sv_reass_main; vec_validate (rm->output_feature_use_refcount_per_intf, sw_if_index); if (is_enable) { if (!rm->output_feature_use_refcount_per_intf[sw_if_index]) { ++rm->output_feature_use_refcount_per_intf[sw_if_index]; return vnet_feature_enable_disable ("ip4-output", "ip4-sv-reassembly-output-feature", sw_if_index, 1, 0, 0); } ++rm->output_feature_use_refcount_per_intf[sw_if_index]; } else { if (rm->output_feature_use_refcount_per_intf[sw_if_index]) --rm->output_feature_use_refcount_per_intf[sw_if_index]; if (!rm->output_feature_use_refcount_per_intf[sw_if_index]) return vnet_feature_enable_disable ("ip4-output", "ip4-sv-reassembly-output-feature", sw_if_index, 0, 0, 0); } return 0; } #endif /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */