/* * ah_encrypt.c : IPSec AH encrypt node * * 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/ipsec/ipsec.h> #include <vnet/ipsec/esp.h> #include <vnet/ipsec/ah.h> #include <vnet/tunnel/tunnel_dp.h> #define foreach_ah_encrypt_next \ _ (DROP, "error-drop") \ _ (HANDOFF, "handoff") \ _ (INTERFACE_OUTPUT, "interface-output") #define _(v, s) AH_ENCRYPT_NEXT_##v, typedef enum { foreach_ah_encrypt_next #undef _ AH_ENCRYPT_N_NEXT, } ah_encrypt_next_t; #define foreach_ah_encrypt_error \ _ (RX_PKTS, "AH pkts received") \ _ (CRYPTO_ENGINE_ERROR, "crypto engine error (packet dropped)") \ _ (SEQ_CYCLED, "sequence number cycled (packet dropped)") typedef enum { #define _(sym,str) AH_ENCRYPT_ERROR_##sym, foreach_ah_encrypt_error #undef _ AH_ENCRYPT_N_ERROR, } ah_encrypt_error_t; static char *ah_encrypt_error_strings[] = { #define _(sym,string) string, foreach_ah_encrypt_error #undef _ }; typedef struct { u32 sa_index; u32 spi; u32 seq_lo; u32 seq_hi; ipsec_integ_alg_t integ_alg; } ah_encrypt_trace_t; /* packet trace format function */ static u8 * format_ah_encrypt_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 *); ah_encrypt_trace_t *t = va_arg (*args, ah_encrypt_trace_t *); s = format (s, "ah: sa-index %d spi %u (0x%08x) seq %u:%u integrity %U", t->sa_index, t->spi, t->spi, t->seq_hi, t->seq_lo, format_ipsec_integ_alg, t->integ_alg); return s; } static_always_inline void ah_process_ops (vlib_main_t * vm, vlib_node_runtime_t * node, vnet_crypto_op_t * ops, vlib_buffer_t * b[], u16 * nexts) { u32 n_fail, n_ops = vec_len (ops); vnet_crypto_op_t *op = ops; if (n_ops == 0) return; n_fail = n_ops - vnet_crypto_process_ops (vm, op, n_ops); while (n_fail) { ASSERT (op - ops < n_ops); if (op->status != VNET_CRYPTO_OP_STATUS_COMPLETED) { u32 bi = op->user_data; b[bi]->error = node->errors[AH_ENCRYPT_ERROR_CRYPTO_ENGINE_ERROR]; nexts[bi] = AH_ENCRYPT_NEXT_DROP; n_fail--; } op++; } } typedef struct { union { /* Variable fields in the IP header not covered by the AH * integrity check */ struct { u32 ip_version_traffic_class_and_flow_label; u8 hop_limit; }; struct { u8 ttl; u8 tos; }; }; u8 skip; i16 current_data; u32 sa_index; } ah_encrypt_packet_data_t; always_inline uword ah_encrypt_inline (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame, int is_ip6) { u32 n_left, *from, thread_index; int icv_size = 0; from = vlib_frame_vector_args (frame); n_left = frame->n_vectors; ipsec_main_t *im = &ipsec_main; ah_encrypt_packet_data_t pkt_data[VLIB_FRAME_SIZE], *pd = pkt_data; thread_index = vm->thread_index; vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs; u16 nexts[VLIB_FRAME_SIZE], *next = nexts; ipsec_per_thread_data_t *ptd = vec_elt_at_index (im->ptd, thread_index); ipsec_sa_t *sa0 = 0; ip4_and_ah_header_t *ih0, *oh0 = 0; ip6_and_ah_header_t *ih6_0, *oh6_0 = 0; u32 current_sa_index = ~0, current_sa_bytes = 0, current_sa_pkts = 0; const static ip4_header_t ip4_hdr_template = { .ip_version_and_header_length = 0x45, .protocol = IP_PROTOCOL_IPSEC_AH, }; const static ip6_header_t ip6_hdr_template = { .ip_version_traffic_class_and_flow_label = 0x60, .protocol = IP_PROTOCOL_IPSEC_AH, }; clib_memset (pkt_data, 0, VLIB_FRAME_SIZE * sizeof (pkt_data[0])); vlib_get_buffers (vm, from, b, n_left); vec_reset_length (ptd->crypto_ops); vec_reset_length (ptd->integ_ops); while (n_left > 0) { u8 ip_hdr_size; u8 next_hdr_type; if (vnet_buffer (b[0])->ipsec.sad_index != current_sa_index) { if (current_sa_index != ~0) vlib_increment_combined_counter (&ipsec_sa_counters, thread_index, current_sa_index, current_sa_pkts, current_sa_bytes); current_sa_index = vnet_buffer (b[0])->ipsec.sad_index; sa0 = ipsec_sa_get (current_sa_index); current_sa_bytes = current_sa_pkts = 0; } pd->sa_index = current_sa_index; next[0] = AH_ENCRYPT_NEXT_DROP; if (PREDICT_FALSE (~0 == sa0->thread_index)) { /* this is the first packet to use this SA, claim the SA * for this thread. this could happen simultaneously on * another thread */ clib_atomic_cmp_and_swap (&sa0->thread_index, ~0, ipsec_sa_assign_thread (thread_index)); } if (PREDICT_TRUE (thread_index != sa0->thread_index)) { vnet_buffer (b[0])->ipsec.thread_index = sa0->thread_index; next[0] = AH_ENCRYPT_NEXT_HANDOFF; goto next; } if (PREDICT_FALSE (esp_seq_advance (sa0))) { b[0]->error = node->errors[AH_ENCRYPT_ERROR_SEQ_CYCLED]; pd->skip = 1; goto next; } current_sa_pkts += 1; current_sa_bytes += b[0]->current_length; ssize_t adv; ih0 = vlib_buffer_get_current (b[0]); if (PREDICT_TRUE (ipsec_sa_is_set_IS_TUNNEL (sa0))) { if (is_ip6) adv = -sizeof (ip6_and_ah_header_t); else adv = -sizeof (ip4_and_ah_header_t); } else { adv = -sizeof (ah_header_t); } icv_size = sa0->integ_icv_size; const u8 padding_len = ah_calc_icv_padding_len (icv_size, is_ip6); adv -= padding_len; /* transport mode save the eth header before it is overwritten */ if (PREDICT_FALSE (!ipsec_sa_is_set_IS_TUNNEL (sa0))) { const u32 l2_len = vnet_buffer (b[0])->ip.save_rewrite_length; u8 *l2_hdr_in = (u8 *) vlib_buffer_get_current (b[0]) - l2_len; u8 *l2_hdr_out = l2_hdr_in + adv - icv_size; clib_memcpy_le32 (l2_hdr_out, l2_hdr_in, l2_len); } vlib_buffer_advance (b[0], adv - icv_size); if (is_ip6) { ih6_0 = (ip6_and_ah_header_t *) ih0; ip_hdr_size = sizeof (ip6_header_t); oh6_0 = vlib_buffer_get_current (b[0]); pd->current_data = b[0]->current_data; pd->hop_limit = ih6_0->ip6.hop_limit; oh6_0->ip6.ip_version_traffic_class_and_flow_label = ih6_0->ip6.ip_version_traffic_class_and_flow_label; if (PREDICT_FALSE (ipsec_sa_is_set_IS_TUNNEL (sa0))) { ip6_set_dscp_network_order (&oh6_0->ip6, sa0->tunnel.t_dscp); tunnel_encap_fixup_6o6 (sa0->tunnel_flags, &ih6_0->ip6, &oh6_0->ip6); } pd->ip_version_traffic_class_and_flow_label = oh6_0->ip6.ip_version_traffic_class_and_flow_label; if (PREDICT_TRUE (ipsec_sa_is_set_IS_TUNNEL (sa0))) { next_hdr_type = IP_PROTOCOL_IPV6; } else { next_hdr_type = ih6_0->ip6.protocol; memmove (oh6_0, ih6_0, sizeof (ip6_header_t)); } clib_memcpy_fast (&oh6_0->ip6, &ip6_hdr_template, 8); oh6_0->ah.reserved = 0; oh6_0->ah.nexthdr = next_hdr_type; oh6_0->ah.spi = clib_net_to_host_u32 (sa0->spi); oh6_0->ah.seq_no = clib_net_to_host_u32 (sa0->seq); oh6_0->ip6.payload_length = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b[0]) - sizeof (ip6_header_t)); oh6_0->ah.hdrlen = (sizeof (ah_header_t) + icv_size + padding_len) / 4 - 2; } else { ip_hdr_size = sizeof (ip4_header_t); oh0 = vlib_buffer_get_current (b[0]); pd->ttl = ih0->ip4.ttl; if (PREDICT_FALSE (ipsec_sa_is_set_IS_TUNNEL (sa0))) { if (sa0->tunnel.t_dscp) pd->tos = sa0->tunnel.t_dscp << 2; else { pd->tos = ih0->ip4.tos; if (!(sa0->tunnel_flags & TUNNEL_ENCAP_DECAP_FLAG_ENCAP_COPY_DSCP)) pd->tos &= 0x3; if (!(sa0->tunnel_flags & TUNNEL_ENCAP_DECAP_FLAG_ENCAP_COPY_ECN)) pd->tos &= 0xfc; } } else { pd->tos = ih0->ip4.tos; } pd->current_data = b[0]->current_data; clib_memset (oh0, 0, sizeof (ip4_and_ah_header_t)); if (PREDICT_TRUE (ipsec_sa_is_set_IS_TUNNEL (sa0))) { next_hdr_type = IP_PROTOCOL_IP_IN_IP; } else { next_hdr_type = ih0->ip4.protocol; memmove (oh0, ih0, sizeof (ip4_header_t)); } clib_memcpy_fast (&oh0->ip4, &ip4_hdr_template, sizeof (ip4_header_t) - sizeof (ip4_address_pair_t)); oh0->ip4.length = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b[0])); oh0->ah.spi = clib_net_to_host_u32 (sa0->spi); oh0->ah.seq_no = clib_net_to_host_u32 (sa0->seq); oh0->ah.nexthdr = next_hdr_type; oh0->ah.hdrlen = (sizeof (ah_header_t) + icv_size + padding_len) / 4 - 2; } if (PREDICT_TRUE (!is_ip6 && ipsec_sa_is_set_IS_TUNNEL (sa0) && !ipsec_sa_is_set_IS_TUNNEL_V6 (sa0))) { clib_memcpy_fast (&oh0->ip4.address_pair, &sa0->ip4_hdr.address_pair, sizeof (ip4_address_pair_t)); next[0] = sa0->dpo.dpoi_next_node; vnet_buffer (b[0])->ip.adj_index[VLIB_TX] = sa0->dpo.dpoi_index; } else if (is_ip6 && ipsec_sa_is_set_IS_TUNNEL (sa0) && ipsec_sa_is_set_IS_TUNNEL_V6 (sa0)) { clib_memcpy_fast (&oh6_0->ip6.src_address, &sa0->ip6_hdr.src_address, sizeof (ip6_address_t) * 2); next[0] = sa0->dpo.dpoi_next_node; vnet_buffer (b[0])->ip.adj_index[VLIB_TX] = sa0->dpo.dpoi_index; } if (PREDICT_TRUE (sa0->integ_op_id)) { vnet_crypto_op_t *op; vec_add2_aligned (ptd->integ_ops, op, 1, CLIB_CACHE_LINE_BYTES); vnet_crypto_op_init (op, sa0->integ_op_id); op->src = vlib_buffer_get_current (b[0]); op->len = b[0]->current_length; op->digest = vlib_buffer_get_current (b[0]) + ip_hdr_size + sizeof (ah_header_t); clib_memset (op->digest, 0, icv_size); op->digest_len = icv_size; op->key_index = sa0->integ_key_index; op->user_data = b - bufs; if (ipsec_sa_is_set_USE_ESN (sa0)) { u32 seq_hi = clib_host_to_net_u32 (sa0->seq_hi); op->len += sizeof (seq_hi); clib_memcpy (op->src + b[0]->current_length, &seq_hi, sizeof (seq_hi)); } } if (!ipsec_sa_is_set_IS_TUNNEL (sa0)) { next[0] = AH_ENCRYPT_NEXT_INTERFACE_OUTPUT; vlib_buffer_advance (b[0], -sizeof (ethernet_header_t)); } next: if (PREDICT_FALSE (b[0]->flags & VLIB_BUFFER_IS_TRACED)) { sa0 = ipsec_sa_get (pd->sa_index); ah_encrypt_trace_t *tr = vlib_add_trace (vm, node, b[0], sizeof (*tr)); tr->spi = sa0->spi; tr->seq_lo = sa0->seq; tr->seq_hi = sa0->seq_hi; tr->integ_alg = sa0->integ_alg; tr->sa_index = pd->sa_index; } n_left -= 1; next += 1; pd += 1; b += 1; } n_left = frame->n_vectors; next = nexts; pd = pkt_data; b = bufs; vlib_node_increment_counter (vm, node->node_index, AH_ENCRYPT_ERROR_RX_PKTS, n_left); vlib_increment_combined_counter (&ipsec_sa_counters, thread_index, current_sa_index, current_sa_pkts, current_sa_bytes); ah_process_ops (vm, node, ptd->integ_ops, bufs, nexts); while (n_left) { if (pd->skip) goto next_pkt; if (is_ip6) { oh6_0 = (ip6_and_ah_header_t *) (b[0]->data + pd->current_data); oh6_0->ip6.hop_limit = pd->hop_limit; oh6_0->ip6.ip_version_traffic_class_and_flow_label = pd->ip_version_traffic_class_and_flow_label; } else { oh0 = (ip4_and_ah_header_t *) (b[0]->data + pd->current_data); oh0->ip4.ttl = pd->ttl; oh0->ip4.tos = pd->tos; oh0->ip4.checksum = ip4_header_checksum (&oh0->ip4); } next_pkt: n_left -= 1; next += 1; pd += 1; b += 1; } n_left = frame->n_vectors; vlib_buffer_enqueue_to_next (vm, node, from, nexts, n_left); return n_left; } VLIB_NODE_FN (ah4_encrypt_node) (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * from_frame) { return ah_encrypt_inline (vm, node, from_frame, 0 /* is_ip6 */ ); } /* *INDENT-OFF* */ VLIB_REGISTER_NODE (ah4_encrypt_node) = { .name = "ah4-encrypt", .vector_size = sizeof (u32), .format_trace = format_ah_encrypt_trace, .type = VLIB_NODE_TYPE_INTERNAL, .n_errors = ARRAY_LEN(ah_encrypt_error_strings), .error_strings = ah_encrypt_error_strings, .n_next_nodes = AH_ENCRYPT_N_NEXT, .next_nodes = { [AH_ENCRYPT_NEXT_DROP] = "ip4-drop", [AH_ENCRYPT_NEXT_HANDOFF] = "ah4-encrypt-handoff", [AH_ENCRYPT_NEXT_INTERFACE_OUTPUT] = "interface-output", }, }; /* *INDENT-ON* */ VLIB_NODE_FN (ah6_encrypt_node) (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * from_frame) { return ah_encrypt_inline (vm, node, from_frame, 1 /* is_ip6 */ ); } /* *INDENT-OFF* */ VLIB_REGISTER_NODE (ah6_encrypt_node) = { .name = "ah6-encrypt", .vector_size = sizeof (u32), .format_trace = format_ah_encrypt_trace, .type = VLIB_NODE_TYPE_INTERNAL, .n_errors = ARRAY_LEN(ah_encrypt_error_strings), .error_strings = ah_encrypt_error_strings, .n_next_nodes = AH_ENCRYPT_N_NEXT, .next_nodes = { [AH_ENCRYPT_NEXT_DROP] = "ip6-drop", [AH_ENCRYPT_NEXT_HANDOFF] = "ah6-encrypt-handoff", [AH_ENCRYPT_NEXT_INTERFACE_OUTPUT] = "interface-output", }, }; /* *INDENT-ON* */ #ifndef CLIB_MARCH_VARIANT static clib_error_t * ah_encrypt_init (vlib_main_t *vm) { ipsec_main_t *im = &ipsec_main; im->ah4_enc_fq_index = vlib_frame_queue_main_init (ah4_encrypt_node.index, 0); im->ah6_enc_fq_index = vlib_frame_queue_main_init (ah6_encrypt_node.index, 0); return 0; } VLIB_INIT_FUNCTION (ah_encrypt_init); #endif /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */