| /* |
| * decap.c : IPSec tunnel decapsulation |
| * |
| * Copyright (c) 2015 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. |
| */ |
| |
| #include <vnet/vnet.h> |
| #include <vnet/api_errno.h> |
| #include <vnet/ip/ip.h> |
| #include <vnet/feature/feature.h> |
| #include <vnet/ipsec/ipsec_spd_fp_lookup.h> |
| |
| #include <vnet/ipsec/ipsec.h> |
| #include <vnet/ipsec/esp.h> |
| #include <vnet/ipsec/ah.h> |
| #include <vnet/ipsec/ipsec_io.h> |
| |
| #define foreach_ipsec_input_error \ |
| _(RX_PKTS, "IPSec pkts received") \ |
| _(RX_POLICY_MATCH, "IPSec policy match") \ |
| _(RX_POLICY_NO_MATCH, "IPSec policy not matched") \ |
| _(RX_POLICY_BYPASS, "IPSec policy bypass") \ |
| _(RX_POLICY_DISCARD, "IPSec policy discard") |
| |
| typedef enum |
| { |
| #define _(sym,str) IPSEC_INPUT_ERROR_##sym, |
| foreach_ipsec_input_error |
| #undef _ |
| IPSEC_INPUT_N_ERROR, |
| } ipsec_input_error_t; |
| |
| static char *ipsec_input_error_strings[] = { |
| #define _(sym,string) string, |
| foreach_ipsec_input_error |
| #undef _ |
| }; |
| |
| typedef struct |
| { |
| ip_protocol_t proto; |
| u32 spd; |
| u32 policy_index; |
| u32 sa_id; |
| u32 spi; |
| u32 seq; |
| } ipsec_input_trace_t; |
| |
| /* packet trace format function */ |
| static u8 * |
| format_ipsec_input_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 *); |
| ipsec_input_trace_t *t = va_arg (*args, ipsec_input_trace_t *); |
| |
| s = format (s, "%U: sa_id %u spd %u policy %d spi %u (0x%08x) seq %u", |
| format_ip_protocol, t->proto, t->sa_id, |
| t->spd, t->policy_index, t->spi, t->spi, t->seq); |
| |
| return s; |
| } |
| |
| always_inline void |
| ipsec4_input_spd_add_flow_cache_entry (ipsec_main_t *im, u32 sa, u32 da, |
| ipsec_spd_policy_type_t policy_type, |
| u32 pol_id) |
| { |
| u64 hash; |
| u8 is_overwrite = 0, is_stale_overwrite = 0; |
| /* Store in network byte order to avoid conversion on lookup */ |
| ipsec4_inbound_spd_tuple_t ip4_tuple = { |
| .ip4_src_addr = (ip4_address_t) clib_host_to_net_u32 (sa), |
| .ip4_dest_addr = (ip4_address_t) clib_host_to_net_u32 (da), |
| .policy_type = policy_type |
| }; |
| |
| ip4_tuple.kv_16_8.value = |
| (((u64) pol_id) << 32) | ((u64) im->input_epoch_count); |
| |
| hash = ipsec4_hash_16_8 (&ip4_tuple.kv_16_8); |
| hash &= (im->ipsec4_in_spd_hash_num_buckets - 1); |
| |
| ipsec_spinlock_lock (&im->ipsec4_in_spd_hash_tbl[hash].bucket_lock); |
| /* Check if we are overwriting an existing entry so we know |
| whether to increment the flow cache counter. Since flow |
| cache counter is reset on any policy add/remove, but |
| hash table values are not, we need to check if the entry |
| we are overwriting is stale or not. If it's a stale entry |
| overwrite, we still want to increment flow cache counter */ |
| is_overwrite = (im->ipsec4_in_spd_hash_tbl[hash].value != 0); |
| /* Check if we are overwriting a stale entry by comparing |
| with current epoch count */ |
| if (PREDICT_FALSE (is_overwrite)) |
| is_stale_overwrite = |
| (im->input_epoch_count != |
| ((u32) (im->ipsec4_in_spd_hash_tbl[hash].value & 0xFFFFFFFF))); |
| clib_memcpy_fast (&im->ipsec4_in_spd_hash_tbl[hash], &ip4_tuple.kv_16_8, |
| sizeof (ip4_tuple.kv_16_8)); |
| ipsec_spinlock_unlock (&im->ipsec4_in_spd_hash_tbl[hash].bucket_lock); |
| |
| /* Increment the counter to track active flow cache entries |
| when entering a fresh entry or overwriting a stale one */ |
| if (!is_overwrite || is_stale_overwrite) |
| clib_atomic_fetch_add_relax (&im->ipsec4_in_spd_flow_cache_entries, 1); |
| |
| return; |
| } |
| |
| always_inline ipsec_policy_t * |
| ipsec4_input_spd_find_flow_cache_entry (ipsec_main_t *im, u32 sa, u32 da, |
| ipsec_spd_policy_type_t policy_type) |
| { |
| ipsec_policy_t *p = NULL; |
| ipsec4_hash_kv_16_8_t kv_result; |
| u64 hash; |
| ipsec4_inbound_spd_tuple_t ip4_tuple = { .ip4_src_addr = (ip4_address_t) sa, |
| .ip4_dest_addr = (ip4_address_t) da, |
| .policy_type = policy_type }; |
| |
| hash = ipsec4_hash_16_8 (&ip4_tuple.kv_16_8); |
| hash &= (im->ipsec4_in_spd_hash_num_buckets - 1); |
| |
| ipsec_spinlock_lock (&im->ipsec4_in_spd_hash_tbl[hash].bucket_lock); |
| kv_result = im->ipsec4_in_spd_hash_tbl[hash]; |
| ipsec_spinlock_unlock (&im->ipsec4_in_spd_hash_tbl[hash].bucket_lock); |
| |
| if (ipsec4_hash_key_compare_16_8 ((u64 *) &ip4_tuple.kv_16_8, |
| (u64 *) &kv_result)) |
| { |
| if (im->input_epoch_count == ((u32) (kv_result.value & 0xFFFFFFFF))) |
| { |
| /* Get the policy based on the index */ |
| p = |
| pool_elt_at_index (im->policies, ((u32) (kv_result.value >> 32))); |
| } |
| } |
| |
| return p; |
| } |
| |
| always_inline void |
| ipsec_fp_in_5tuple_from_ip4_range (ipsec_fp_5tuple_t *tuple, u32 la, u32 ra, |
| u32 spi, u8 action) |
| { |
| clib_memset (tuple->l3_zero_pad, 0, sizeof (tuple->l3_zero_pad)); |
| tuple->laddr.as_u32 = la; |
| tuple->raddr.as_u32 = ra; |
| tuple->spi = spi; |
| tuple->action = action; |
| tuple->is_ipv6 = 0; |
| } |
| |
| always_inline ipsec_policy_t * |
| ipsec_input_policy_match (ipsec_spd_t *spd, u32 sa, u32 da, |
| ipsec_spd_policy_type_t policy_type) |
| { |
| ipsec_main_t *im = &ipsec_main; |
| ipsec_policy_t *p; |
| u32 *i; |
| |
| vec_foreach (i, spd->policies[policy_type]) |
| { |
| p = pool_elt_at_index (im->policies, *i); |
| |
| if (da < clib_net_to_host_u32 (p->laddr.start.ip4.as_u32)) |
| continue; |
| |
| if (da > clib_net_to_host_u32 (p->laddr.stop.ip4.as_u32)) |
| continue; |
| |
| if (sa < clib_net_to_host_u32 (p->raddr.start.ip4.as_u32)) |
| continue; |
| |
| if (sa > clib_net_to_host_u32 (p->raddr.stop.ip4.as_u32)) |
| continue; |
| |
| if (im->input_flow_cache_flag) |
| { |
| /* Add an Entry in Flow cache */ |
| ipsec4_input_spd_add_flow_cache_entry (im, sa, da, policy_type, *i); |
| } |
| return p; |
| } |
| return 0; |
| } |
| |
| always_inline ipsec_policy_t * |
| ipsec_input_protect_policy_match (ipsec_spd_t *spd, u32 sa, u32 da, u32 spi) |
| { |
| ipsec_main_t *im = &ipsec_main; |
| ipsec_policy_t *p; |
| ipsec_sa_t *s; |
| u32 *i; |
| |
| vec_foreach (i, spd->policies[IPSEC_SPD_POLICY_IP4_INBOUND_PROTECT]) |
| { |
| p = pool_elt_at_index (im->policies, *i); |
| s = ipsec_sa_get (p->sa_index); |
| |
| if (spi != s->spi) |
| continue; |
| |
| if (ipsec_sa_is_set_IS_TUNNEL (s)) |
| { |
| if (da != clib_net_to_host_u32 (s->tunnel.t_dst.ip.ip4.as_u32)) |
| continue; |
| |
| if (sa != clib_net_to_host_u32 (s->tunnel.t_src.ip.ip4.as_u32)) |
| continue; |
| |
| goto return_policy; |
| } |
| |
| if (da < clib_net_to_host_u32 (p->laddr.start.ip4.as_u32)) |
| continue; |
| |
| if (da > clib_net_to_host_u32 (p->laddr.stop.ip4.as_u32)) |
| continue; |
| |
| if (sa < clib_net_to_host_u32 (p->raddr.start.ip4.as_u32)) |
| continue; |
| |
| if (sa > clib_net_to_host_u32 (p->raddr.stop.ip4.as_u32)) |
| continue; |
| |
| return_policy: |
| if (im->input_flow_cache_flag) |
| { |
| /* Add an Entry in Flow cache */ |
| ipsec4_input_spd_add_flow_cache_entry ( |
| im, sa, da, IPSEC_SPD_POLICY_IP4_INBOUND_PROTECT, *i); |
| } |
| |
| return p; |
| } |
| return 0; |
| } |
| |
| always_inline uword |
| ip6_addr_match_range (ip6_address_t * a, ip6_address_t * la, |
| ip6_address_t * ua) |
| { |
| if ((memcmp (a->as_u64, la->as_u64, 2 * sizeof (u64)) >= 0) && |
| (memcmp (a->as_u64, ua->as_u64, 2 * sizeof (u64)) <= 0)) |
| return 1; |
| return 0; |
| } |
| |
| always_inline ipsec_policy_t * |
| ipsec6_input_protect_policy_match (ipsec_spd_t * spd, |
| ip6_address_t * sa, |
| ip6_address_t * da, u32 spi) |
| { |
| ipsec_main_t *im = &ipsec_main; |
| ipsec_policy_t *p; |
| ipsec_sa_t *s; |
| u32 *i; |
| |
| vec_foreach (i, spd->policies[IPSEC_SPD_POLICY_IP6_INBOUND_PROTECT]) |
| { |
| p = pool_elt_at_index (im->policies, *i); |
| s = ipsec_sa_get (p->sa_index); |
| |
| if (spi != s->spi) |
| continue; |
| |
| if (ipsec_sa_is_set_IS_TUNNEL (s)) |
| { |
| if (!ip6_address_is_equal (sa, &s->tunnel.t_src.ip.ip6)) |
| continue; |
| |
| if (!ip6_address_is_equal (da, &s->tunnel.t_dst.ip.ip6)) |
| continue; |
| |
| return p; |
| } |
| |
| if (!ip6_addr_match_range (sa, &p->raddr.start.ip6, &p->raddr.stop.ip6)) |
| continue; |
| |
| if (!ip6_addr_match_range (da, &p->laddr.start.ip6, &p->laddr.stop.ip6)) |
| continue; |
| |
| return p; |
| } |
| return 0; |
| } |
| |
| extern vlib_node_registration_t ipsec4_input_node; |
| |
| VLIB_NODE_FN (ipsec4_input_node) (vlib_main_t * vm, |
| vlib_node_runtime_t * node, |
| vlib_frame_t * frame) |
| { |
| u32 n_left_from, *from, thread_index; |
| ipsec_main_t *im = &ipsec_main; |
| u64 ipsec_unprocessed = 0, ipsec_matched = 0; |
| u64 ipsec_dropped = 0, ipsec_bypassed = 0; |
| vlib_buffer_t *bufs[VLIB_FRAME_SIZE]; |
| vlib_buffer_t **b = bufs; |
| u16 nexts[VLIB_FRAME_SIZE], *next; |
| |
| from = vlib_frame_vector_args (frame); |
| n_left_from = frame->n_vectors; |
| next = nexts; |
| vlib_get_buffers (vm, from, bufs, n_left_from); |
| thread_index = vm->thread_index; |
| |
| |
| while (n_left_from > 0) |
| { |
| u32 next32, pi0; |
| ip4_header_t *ip0; |
| esp_header_t *esp0 = NULL; |
| ah_header_t *ah0; |
| ip4_ipsec_config_t *c0; |
| ipsec_spd_t *spd0; |
| ipsec_policy_t *p0 = NULL; |
| u8 has_space0; |
| bool search_flow_cache = false; |
| ipsec_policy_t *policies[1]; |
| ipsec_fp_5tuple_t tuples[1]; |
| bool ip_v6 = true; |
| |
| if (n_left_from > 2) |
| { |
| vlib_prefetch_buffer_data (b[1], LOAD); |
| } |
| |
| b[0]->flags |= VNET_BUFFER_F_IS_IP4; |
| b[0]->flags &= ~VNET_BUFFER_F_IS_IP6; |
| c0 = vnet_feature_next_with_data (&next32, b[0], sizeof (c0[0])); |
| next[0] = (u16) next32; |
| |
| spd0 = pool_elt_at_index (im->spds, c0->spd_index); |
| |
| ip0 = vlib_buffer_get_current (b[0]); |
| |
| if (PREDICT_TRUE |
| (ip0->protocol == IP_PROTOCOL_IPSEC_ESP |
| || ip0->protocol == IP_PROTOCOL_UDP)) |
| { |
| |
| esp0 = (esp_header_t *) ((u8 *) ip0 + ip4_header_bytes (ip0)); |
| if (PREDICT_FALSE (ip0->protocol == IP_PROTOCOL_UDP)) |
| { |
| /* FIXME Skip, if not a UDP encapsulated packet */ |
| esp0 = (esp_header_t *) ((u8 *) esp0 + sizeof (udp_header_t)); |
| } |
| |
| // if flow cache is enabled, first search through flow cache for a |
| // policy match for either protect, bypass or discard rules, in that |
| // order. if no match is found search_flow_cache is set to false (1) |
| // and we revert back to linear search |
| search_flow_cache = im->input_flow_cache_flag; |
| |
| esp_or_udp: |
| if (im->fp_spd_ipv4_in_is_enabled && |
| PREDICT_TRUE (INDEX_INVALID != |
| spd0->fp_spd.ip4_in_lookup_hash_idx)) |
| { |
| ipsec_fp_in_5tuple_from_ip4_range ( |
| &tuples[0], ip0->src_address.as_u32, ip0->dst_address.as_u32, |
| clib_net_to_host_u32 (esp0->spi), |
| IPSEC_SPD_POLICY_IP4_INBOUND_PROTECT); |
| ipsec_fp_in_policy_match_n (&spd0->fp_spd, !ip_v6, tuples, |
| policies, 1); |
| p0 = policies[0]; |
| } |
| else if (search_flow_cache) // attempt to match policy in flow cache |
| { |
| p0 = ipsec4_input_spd_find_flow_cache_entry ( |
| im, ip0->src_address.as_u32, ip0->dst_address.as_u32, |
| IPSEC_SPD_POLICY_IP4_INBOUND_PROTECT); |
| } |
| |
| else // linear search if flow cache is not enabled, |
| // or flow cache search just failed |
| { |
| p0 = ipsec_input_protect_policy_match ( |
| spd0, clib_net_to_host_u32 (ip0->src_address.as_u32), |
| clib_net_to_host_u32 (ip0->dst_address.as_u32), |
| clib_net_to_host_u32 (esp0->spi)); |
| } |
| |
| has_space0 = |
| vlib_buffer_has_space (b[0], |
| (clib_address_t) (esp0 + 1) - |
| (clib_address_t) ip0); |
| |
| if (PREDICT_TRUE ((p0 != NULL) & (has_space0))) |
| { |
| ipsec_matched += 1; |
| |
| pi0 = p0 - im->policies; |
| vlib_increment_combined_counter |
| (&ipsec_spd_policy_counters, |
| thread_index, pi0, 1, clib_net_to_host_u16 (ip0->length)); |
| |
| vnet_buffer (b[0])->ipsec.sad_index = p0->sa_index; |
| next[0] = im->esp4_decrypt_next_index; |
| vlib_buffer_advance (b[0], ((u8 *) esp0 - (u8 *) ip0)); |
| goto trace0; |
| } |
| else |
| { |
| p0 = 0; |
| pi0 = ~0; |
| }; |
| |
| if (im->fp_spd_ipv4_in_is_enabled && |
| PREDICT_TRUE (INDEX_INVALID != |
| spd0->fp_spd.ip4_in_lookup_hash_idx)) |
| { |
| tuples->action = IPSEC_SPD_POLICY_IP4_INBOUND_BYPASS; |
| ipsec_fp_in_policy_match_n (&spd0->fp_spd, !ip_v6, tuples, |
| policies, 1); |
| p0 = policies[0]; |
| } |
| else if (search_flow_cache) |
| { |
| p0 = ipsec4_input_spd_find_flow_cache_entry ( |
| im, ip0->src_address.as_u32, ip0->dst_address.as_u32, |
| IPSEC_SPD_POLICY_IP4_INBOUND_BYPASS); |
| } |
| |
| else |
| { |
| p0 = ipsec_input_policy_match ( |
| spd0, clib_net_to_host_u32 (ip0->src_address.as_u32), |
| clib_net_to_host_u32 (ip0->dst_address.as_u32), |
| IPSEC_SPD_POLICY_IP4_INBOUND_BYPASS); |
| } |
| |
| if (PREDICT_TRUE ((p0 != NULL))) |
| { |
| ipsec_bypassed += 1; |
| |
| pi0 = p0 - im->policies; |
| vlib_increment_combined_counter ( |
| &ipsec_spd_policy_counters, thread_index, pi0, 1, |
| clib_net_to_host_u16 (ip0->length)); |
| |
| goto trace0; |
| } |
| else |
| { |
| p0 = 0; |
| pi0 = ~0; |
| }; |
| |
| if (im->fp_spd_ipv4_in_is_enabled && |
| PREDICT_TRUE (INDEX_INVALID != |
| spd0->fp_spd.ip4_in_lookup_hash_idx)) |
| { |
| tuples->action = IPSEC_SPD_POLICY_IP4_INBOUND_DISCARD; |
| ipsec_fp_in_policy_match_n (&spd0->fp_spd, !ip_v6, tuples, |
| policies, 1); |
| p0 = policies[0]; |
| } |
| else |
| |
| if (search_flow_cache) |
| { |
| p0 = ipsec4_input_spd_find_flow_cache_entry ( |
| im, ip0->src_address.as_u32, ip0->dst_address.as_u32, |
| IPSEC_SPD_POLICY_IP4_INBOUND_DISCARD); |
| } |
| |
| else |
| { |
| p0 = ipsec_input_policy_match ( |
| spd0, clib_net_to_host_u32 (ip0->src_address.as_u32), |
| clib_net_to_host_u32 (ip0->dst_address.as_u32), |
| IPSEC_SPD_POLICY_IP4_INBOUND_DISCARD); |
| } |
| |
| if (PREDICT_TRUE ((p0 != NULL))) |
| { |
| ipsec_dropped += 1; |
| |
| pi0 = p0 - im->policies; |
| vlib_increment_combined_counter ( |
| &ipsec_spd_policy_counters, thread_index, pi0, 1, |
| clib_net_to_host_u16 (ip0->length)); |
| |
| next[0] = IPSEC_INPUT_NEXT_DROP; |
| goto trace0; |
| } |
| else |
| { |
| p0 = 0; |
| pi0 = ~0; |
| }; |
| |
| // flow cache search failed, try again with linear search |
| if (search_flow_cache && p0 == NULL) |
| { |
| search_flow_cache = false; |
| goto esp_or_udp; |
| } |
| |
| /* Drop by default if no match on PROTECT, BYPASS or DISCARD */ |
| ipsec_unprocessed += 1; |
| next[0] = IPSEC_INPUT_NEXT_DROP; |
| |
| trace0: |
| if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE) && |
| PREDICT_FALSE (b[0]->flags & VLIB_BUFFER_IS_TRACED)) |
| { |
| ipsec_input_trace_t *tr = |
| vlib_add_trace (vm, node, b[0], sizeof (*tr)); |
| |
| tr->proto = ip0->protocol; |
| tr->sa_id = p0 ? p0->sa_id : ~0; |
| tr->spi = has_space0 ? clib_net_to_host_u32 (esp0->spi) : ~0; |
| tr->seq = has_space0 ? clib_net_to_host_u32 (esp0->seq) : ~0; |
| tr->spd = spd0->id; |
| tr->policy_index = pi0; |
| } |
| } |
| else if (ip0->protocol == IP_PROTOCOL_IPSEC_AH) |
| { |
| ah0 = (ah_header_t *) ((u8 *) ip0 + ip4_header_bytes (ip0)); |
| |
| // if flow cache is enabled, first search through flow cache for a |
| // policy match and revert back to linear search on failure |
| search_flow_cache = im->input_flow_cache_flag; |
| |
| ah: |
| if (search_flow_cache) |
| { |
| p0 = ipsec4_input_spd_find_flow_cache_entry ( |
| im, ip0->src_address.as_u32, ip0->dst_address.as_u32, |
| IPSEC_SPD_POLICY_IP4_INBOUND_PROTECT); |
| } |
| |
| else |
| { |
| p0 = ipsec_input_protect_policy_match ( |
| spd0, clib_net_to_host_u32 (ip0->src_address.as_u32), |
| clib_net_to_host_u32 (ip0->dst_address.as_u32), |
| clib_net_to_host_u32 (ah0->spi)); |
| } |
| |
| has_space0 = |
| vlib_buffer_has_space (b[0], |
| (clib_address_t) (ah0 + 1) - |
| (clib_address_t) ip0); |
| |
| if (PREDICT_TRUE ((p0 != NULL) & (has_space0))) |
| { |
| ipsec_matched += 1; |
| |
| pi0 = p0 - im->policies; |
| vlib_increment_combined_counter |
| (&ipsec_spd_policy_counters, |
| thread_index, pi0, 1, clib_net_to_host_u16 (ip0->length)); |
| |
| vnet_buffer (b[0])->ipsec.sad_index = p0->sa_index; |
| next[0] = im->ah4_decrypt_next_index; |
| goto trace1; |
| } |
| else |
| { |
| p0 = 0; |
| pi0 = ~0; |
| } |
| |
| if (search_flow_cache) |
| { |
| p0 = ipsec4_input_spd_find_flow_cache_entry ( |
| im, ip0->src_address.as_u32, ip0->dst_address.as_u32, |
| IPSEC_SPD_POLICY_IP4_INBOUND_BYPASS); |
| } |
| |
| else |
| { |
| p0 = ipsec_input_policy_match ( |
| spd0, clib_net_to_host_u32 (ip0->src_address.as_u32), |
| clib_net_to_host_u32 (ip0->dst_address.as_u32), |
| IPSEC_SPD_POLICY_IP4_INBOUND_BYPASS); |
| } |
| |
| if (PREDICT_TRUE ((p0 != NULL))) |
| { |
| ipsec_bypassed += 1; |
| |
| pi0 = p0 - im->policies; |
| vlib_increment_combined_counter ( |
| &ipsec_spd_policy_counters, thread_index, pi0, 1, |
| clib_net_to_host_u16 (ip0->length)); |
| |
| goto trace1; |
| } |
| else |
| { |
| p0 = 0; |
| pi0 = ~0; |
| }; |
| |
| if (search_flow_cache) |
| { |
| p0 = ipsec4_input_spd_find_flow_cache_entry ( |
| im, ip0->src_address.as_u32, ip0->dst_address.as_u32, |
| IPSEC_SPD_POLICY_IP4_INBOUND_DISCARD); |
| } |
| |
| else |
| { |
| p0 = ipsec_input_policy_match ( |
| spd0, clib_net_to_host_u32 (ip0->src_address.as_u32), |
| clib_net_to_host_u32 (ip0->dst_address.as_u32), |
| IPSEC_SPD_POLICY_IP4_INBOUND_DISCARD); |
| } |
| |
| if (PREDICT_TRUE ((p0 != NULL))) |
| { |
| ipsec_dropped += 1; |
| |
| pi0 = p0 - im->policies; |
| vlib_increment_combined_counter ( |
| &ipsec_spd_policy_counters, thread_index, pi0, 1, |
| clib_net_to_host_u16 (ip0->length)); |
| |
| next[0] = IPSEC_INPUT_NEXT_DROP; |
| goto trace1; |
| } |
| else |
| { |
| p0 = 0; |
| pi0 = ~0; |
| }; |
| |
| // flow cache search failed, retry with linear search |
| if (search_flow_cache && p0 == NULL) |
| { |
| search_flow_cache = false; |
| goto ah; |
| } |
| |
| /* Drop by default if no match on PROTECT, BYPASS or DISCARD */ |
| ipsec_unprocessed += 1; |
| next[0] = IPSEC_INPUT_NEXT_DROP; |
| |
| trace1: |
| if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE) && |
| PREDICT_FALSE (b[0]->flags & VLIB_BUFFER_IS_TRACED)) |
| { |
| ipsec_input_trace_t *tr = |
| vlib_add_trace (vm, node, b[0], sizeof (*tr)); |
| |
| tr->proto = ip0->protocol; |
| tr->sa_id = p0 ? p0->sa_id : ~0; |
| tr->spi = has_space0 ? clib_net_to_host_u32 (ah0->spi) : ~0; |
| tr->seq = has_space0 ? clib_net_to_host_u32 (ah0->seq_no) : ~0; |
| tr->spd = spd0->id; |
| tr->policy_index = pi0; |
| } |
| } |
| else |
| { |
| ipsec_unprocessed += 1; |
| } |
| n_left_from -= 1; |
| b += 1; |
| next += 1; |
| } |
| |
| vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors); |
| |
| vlib_node_increment_counter (vm, ipsec4_input_node.index, |
| IPSEC_INPUT_ERROR_RX_PKTS, frame->n_vectors); |
| |
| vlib_node_increment_counter (vm, ipsec4_input_node.index, |
| IPSEC_INPUT_ERROR_RX_POLICY_MATCH, |
| ipsec_matched); |
| |
| vlib_node_increment_counter (vm, ipsec4_input_node.index, |
| IPSEC_INPUT_ERROR_RX_POLICY_NO_MATCH, |
| ipsec_unprocessed); |
| |
| vlib_node_increment_counter (vm, ipsec4_input_node.index, |
| IPSEC_INPUT_ERROR_RX_POLICY_DISCARD, |
| ipsec_dropped); |
| |
| vlib_node_increment_counter (vm, ipsec4_input_node.index, |
| IPSEC_INPUT_ERROR_RX_POLICY_BYPASS, |
| ipsec_bypassed); |
| |
| return frame->n_vectors; |
| } |
| |
| |
| /* *INDENT-OFF* */ |
| VLIB_REGISTER_NODE (ipsec4_input_node) = { |
| .name = "ipsec4-input-feature", |
| .vector_size = sizeof (u32), |
| .format_trace = format_ipsec_input_trace, |
| .type = VLIB_NODE_TYPE_INTERNAL, |
| .n_errors = ARRAY_LEN(ipsec_input_error_strings), |
| .error_strings = ipsec_input_error_strings, |
| .n_next_nodes = IPSEC_INPUT_N_NEXT, |
| .next_nodes = { |
| #define _(s,n) [IPSEC_INPUT_NEXT_##s] = n, |
| foreach_ipsec_input_next |
| #undef _ |
| }, |
| }; |
| /* *INDENT-ON* */ |
| |
| extern vlib_node_registration_t ipsec6_input_node; |
| |
| |
| VLIB_NODE_FN (ipsec6_input_node) (vlib_main_t * vm, |
| vlib_node_runtime_t * node, |
| vlib_frame_t * from_frame) |
| { |
| u32 n_left_from, *from, next_index, *to_next, thread_index; |
| ipsec_main_t *im = &ipsec_main; |
| u32 ipsec_unprocessed = 0; |
| u32 ipsec_matched = 0; |
| |
| from = vlib_frame_vector_args (from_frame); |
| n_left_from = from_frame->n_vectors; |
| thread_index = vm->thread_index; |
| |
| next_index = node->cached_next_index; |
| |
| while (n_left_from > 0) |
| { |
| u32 n_left_to_next; |
| |
| 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, next0, pi0; |
| vlib_buffer_t *b0; |
| ip6_header_t *ip0; |
| esp_header_t *esp0; |
| ip4_ipsec_config_t *c0; |
| ipsec_spd_t *spd0; |
| ipsec_policy_t *p0 = 0; |
| ah_header_t *ah0; |
| u32 header_size = sizeof (ip0[0]); |
| |
| bi0 = to_next[0] = from[0]; |
| from += 1; |
| n_left_from -= 1; |
| to_next += 1; |
| n_left_to_next -= 1; |
| |
| b0 = vlib_get_buffer (vm, bi0); |
| b0->flags |= VNET_BUFFER_F_IS_IP6; |
| b0->flags &= ~VNET_BUFFER_F_IS_IP4; |
| c0 = vnet_feature_next_with_data (&next0, b0, sizeof (c0[0])); |
| |
| spd0 = pool_elt_at_index (im->spds, c0->spd_index); |
| |
| ip0 = vlib_buffer_get_current (b0); |
| esp0 = (esp_header_t *) ((u8 *) ip0 + header_size); |
| ah0 = (ah_header_t *) ((u8 *) ip0 + header_size); |
| |
| if (PREDICT_TRUE (ip0->protocol == IP_PROTOCOL_IPSEC_ESP)) |
| { |
| #if 0 |
| clib_warning |
| ("packet received from %U to %U spi %u size %u spd_id %u", |
| format_ip6_address, &ip0->src_address, format_ip6_address, |
| &ip0->dst_address, clib_net_to_host_u32 (esp0->spi), |
| clib_net_to_host_u16 (ip0->payload_length) + header_size, |
| spd0->id); |
| #endif |
| p0 = ipsec6_input_protect_policy_match (spd0, |
| &ip0->src_address, |
| &ip0->dst_address, |
| clib_net_to_host_u32 |
| (esp0->spi)); |
| |
| if (PREDICT_TRUE (p0 != 0)) |
| { |
| ipsec_matched += 1; |
| |
| pi0 = p0 - im->policies; |
| vlib_increment_combined_counter |
| (&ipsec_spd_policy_counters, |
| thread_index, pi0, 1, |
| clib_net_to_host_u16 (ip0->payload_length) + |
| header_size); |
| |
| vnet_buffer (b0)->ipsec.sad_index = p0->sa_index; |
| next0 = im->esp6_decrypt_next_index; |
| vlib_buffer_advance (b0, header_size); |
| goto trace0; |
| } |
| else |
| { |
| pi0 = ~0; |
| ipsec_unprocessed += 1; |
| next0 = IPSEC_INPUT_NEXT_DROP; |
| } |
| } |
| else if (ip0->protocol == IP_PROTOCOL_IPSEC_AH) |
| { |
| p0 = ipsec6_input_protect_policy_match (spd0, |
| &ip0->src_address, |
| &ip0->dst_address, |
| clib_net_to_host_u32 |
| (ah0->spi)); |
| |
| if (PREDICT_TRUE (p0 != 0)) |
| { |
| ipsec_matched += 1; |
| pi0 = p0 - im->policies; |
| vlib_increment_combined_counter |
| (&ipsec_spd_policy_counters, |
| thread_index, pi0, 1, |
| clib_net_to_host_u16 (ip0->payload_length) + |
| header_size); |
| |
| vnet_buffer (b0)->ipsec.sad_index = p0->sa_index; |
| next0 = im->ah6_decrypt_next_index; |
| goto trace0; |
| } |
| else |
| { |
| pi0 = ~0; |
| ipsec_unprocessed += 1; |
| next0 = IPSEC_INPUT_NEXT_DROP; |
| } |
| } |
| else |
| { |
| ipsec_unprocessed += 1; |
| } |
| |
| trace0: |
| if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE) && |
| PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) |
| { |
| ipsec_input_trace_t *tr = |
| vlib_add_trace (vm, node, b0, sizeof (*tr)); |
| |
| if (p0) |
| tr->sa_id = p0->sa_id; |
| tr->proto = ip0->protocol; |
| tr->spi = clib_net_to_host_u32 (esp0->spi); |
| tr->seq = clib_net_to_host_u32 (esp0->seq); |
| tr->spd = spd0->id; |
| } |
| |
| vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, |
| n_left_to_next, bi0, next0); |
| } |
| vlib_put_next_frame (vm, node, next_index, n_left_to_next); |
| } |
| |
| vlib_node_increment_counter (vm, ipsec6_input_node.index, |
| IPSEC_INPUT_ERROR_RX_PKTS, |
| from_frame->n_vectors - ipsec_unprocessed); |
| |
| vlib_node_increment_counter (vm, ipsec6_input_node.index, |
| IPSEC_INPUT_ERROR_RX_POLICY_MATCH, |
| ipsec_matched); |
| |
| return from_frame->n_vectors; |
| } |
| |
| |
| /* *INDENT-OFF* */ |
| VLIB_REGISTER_NODE (ipsec6_input_node) = { |
| .name = "ipsec6-input-feature", |
| .vector_size = sizeof (u32), |
| .format_trace = format_ipsec_input_trace, |
| .type = VLIB_NODE_TYPE_INTERNAL, |
| .n_errors = ARRAY_LEN(ipsec_input_error_strings), |
| .error_strings = ipsec_input_error_strings, |
| .n_next_nodes = IPSEC_INPUT_N_NEXT, |
| .next_nodes = { |
| #define _(s,n) [IPSEC_INPUT_NEXT_##s] = n, |
| foreach_ipsec_input_next |
| #undef _ |
| }, |
| }; |
| /* *INDENT-ON* */ |
| |
| /* |
| * fd.io coding-style-patch-verification: ON |
| * |
| * Local Variables: |
| * eval: (c-set-style "gnu") |
| * End: |
| */ |