/* * 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.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 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; 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; return p; } 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 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; 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)); } 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; }; 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; }; 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; }; 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)); 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; } 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; }; 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; }; 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; } } 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; } } 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: */