+++ /dev/null
-/*
- * ah_decrypt.c : ipsecmb AH decrypt 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 <ipsecmb/ipsecmb.h>
-
-#define foreach_ah_decrypt_next \
- _ (DROP, "error-drop") \
- _ (IP4_INPUT, "ip4-input") \
- _ (IP6_INPUT, "ip6-input") \
- _ (IPSEC_GRE_INPUT, "ipsec-gre-input")
-
-#define _(v, s) AH_DECRYPT_NEXT_##v,
-typedef enum
-{
- foreach_ah_decrypt_next
-#undef _
- AH_DECRYPT_N_NEXT,
-} ah_decrypt_next_t;
-
-#define foreach_ah_decrypt_error \
- _ (RX_PKTS, "AH pkts received") \
- _ (DECRYPTION_FAILED, "AH decryption failed") \
- _ (INTEG_ERROR, "Integrity check failed") \
- _ (REPLAY, "SA replayed packet") \
- _ (NOT_IP, "Not IP packet (dropped)")
-
-typedef enum
-{
-#define _(sym, str) AH_DECRYPT_ERROR_##sym,
- foreach_ah_decrypt_error
-#undef _
- AH_DECRYPT_N_ERROR,
-} ah_decrypt_error_t;
-
-static char *ah_decrypt_error_strings[] = {
-#define _(sym, string) string,
- foreach_ah_decrypt_error
-#undef _
-};
-
-typedef struct
-{
- ipsec_integ_alg_t integ_alg;
-} ah_decrypt_trace_t;
-
-/* packet trace format function */
-static u8 *
-format_ah_decrypt_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_decrypt_trace_t *t = va_arg (*args, ah_decrypt_trace_t *);
-
- s = format (s, "ah: integrity %U", format_ipsec_integ_alg, t->integ_alg);
- return s;
-}
-
-typedef struct
-{
- u8 tos;
- u8 ttl;
- u32 ip_version_traffic_class_and_flow_label;
- u8 hop_limit;
-} ip_mutable_data_t;
-
-#ifdef CLIB_MARCH_VARIANT
-always_inline void
-remove_ah (vlib_main_t * vm, vlib_node_runtime_t * node, u32 * bi0,
- u32 * next0, ipsec_sa_t * sa0, u32 ip_hdr_size, u32 icv_size,
- u8 icv_padding_len, ah_header_t * ah0, int is_ip6)
-{
- vlib_buffer_t *b0 = vlib_get_buffer (vm, *bi0);
-
- if (sa0->is_tunnel)
- { /* tunnel mode */
- vlib_buffer_advance (b0, ip_hdr_size + sizeof (ah_header_t) + icv_size +
- icv_padding_len);
- if (ah0->nexthdr == IP_PROTOCOL_IP_IN_IP)
- *next0 = AH_DECRYPT_NEXT_IP4_INPUT;
- else if (ah0->nexthdr == IP_PROTOCOL_IPV6)
- *next0 = AH_DECRYPT_NEXT_IP6_INPUT;
- else
- {
- clib_warning ("next header: 0x%x", ah0->nexthdr);
- vlib_node_increment_counter (vm, node->node_index,
- AH_DECRYPT_ERROR_DECRYPTION_FAILED, 1);
- *next0 = AH_DECRYPT_NEXT_DROP;
- return;
- }
- }
- else
- { /* transport mode */
- const size_t ip_hdr_offset =
- sizeof (ah_header_t) + icv_size + icv_padding_len;
- if (is_ip6)
- { /* ipv6 */
- ip6_header_t *ih6 =
- (ip6_header_t *) ((u8 *) vlib_buffer_get_current (b0) +
- ip_hdr_offset);
- u8 nexthdr = ah0->nexthdr;
- memmove (ih6, vlib_buffer_get_current (b0), sizeof (ip6_header_t));
- vlib_buffer_advance (b0, ip_hdr_offset);
-
- *next0 = AH_DECRYPT_NEXT_IP6_INPUT;
- ih6->protocol = nexthdr;
- ih6->payload_length =
- clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0) -
- sizeof (ip6_header_t));
- }
- else
- { /* ipv4 */
- ip4_header_t *ih4 =
- (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b0) +
- ip_hdr_offset);
- u8 nexthdr = ah0->nexthdr;
- memmove (ih4, vlib_buffer_get_current (b0), sizeof (ip4_header_t));
- vlib_buffer_advance (b0, ip_hdr_offset);
-
- *next0 = AH_DECRYPT_NEXT_IP4_INPUT;
- ih4->ip_version_and_header_length = 0x45;
- ih4->fragment_id = 0;
- ih4->flags_and_fragment_offset = 0;
- ih4->protocol = nexthdr;
- ih4->length =
- clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0));
- ih4->checksum = ip4_header_checksum (ih4);
- }
- }
-
- /* for IPSec-GRE tunnel next node is ipsec-gre-input */
- if (PREDICT_FALSE
- ((vnet_buffer (b0)->ipsec.flags & IPSEC_FLAG_IPSEC_GRE_TUNNEL)))
- {
- *next0 = AH_DECRYPT_NEXT_IPSEC_GRE_INPUT;
- }
-}
-
-always_inline void
-ah_finish_decrypt (vlib_main_t * vm, vlib_node_runtime_t * node,
- JOB_AES_HMAC * job, u32 * bi0, u32 * next0, int is_ip6)
-{
- ipsec_main_t *im = &ipsec_main;
- *bi0 = (uintptr_t) job->user_data;
- vlib_buffer_t *b0 = vlib_get_buffer (vm, *bi0);
- ipsec_sa_t *sa0 =
- pool_elt_at_index (im->sad, vnet_buffer (b0)->ipsec.sad_index);
- ipsec_proto_main_t *em = &ipsec_proto_main;
- u32 icv_size = em->ipsec_proto_main_integ_algs[sa0->integ_alg].trunc_size;
- u32 ip_hdr_size = 0;
- ip4_header_t *ih4 = vlib_buffer_get_current (b0);
- size_t seq_size = 0;
- if (PREDICT_TRUE (sa0->use_esn))
- {
- seq_size = sizeof (u32);
- }
- ip_mutable_data_t *md =
- (ip_mutable_data_t *) ((u8 *) vlib_buffer_get_current (b0) +
- b0->current_length + seq_size + icv_size);
- if (is_ip6)
- {
- ip_hdr_size = sizeof (ip6_header_t);
- ip6_header_t *ih6 = vlib_buffer_get_current (b0);
- ih6->ip_version_traffic_class_and_flow_label =
- md->ip_version_traffic_class_and_flow_label;
- ih6->hop_limit = md->hop_limit;
- }
- else
- {
- ip_hdr_size = ip4_header_bytes (ih4);
- ih4->ttl = md->ttl;
- ih4->tos = md->tos;
- }
-
- u8 icv_padding_len = ah_calc_icv_padding_len (icv_size, is_ip6);
- ah_header_t *ah0 =
- (ah_header_t *) ((u8 *) vlib_buffer_get_current (b0) + ip_hdr_size);
- void *digest = ah0 + 1;
- void *sig = vlib_buffer_get_current (b0) + b0->current_length + seq_size;
-
- if (PREDICT_FALSE (memcmp (digest, sig, icv_size)))
- {
- vlib_node_increment_counter (vm, node->node_index,
- AH_DECRYPT_ERROR_INTEG_ERROR, 1);
- *next0 = AH_DECRYPT_NEXT_DROP;
- return;
- }
-
- if (PREDICT_TRUE (sa0->use_anti_replay))
- {
- if (PREDICT_TRUE (sa0->use_esn))
- esp_replay_advance_esn (sa0, clib_host_to_net_u32 (ah0->seq_no));
- else
- esp_replay_advance (sa0, clib_host_to_net_u32 (ah0->seq_no));
- }
- remove_ah (vm, node, bi0, next0, sa0, ip_hdr_size, icv_size,
- icv_padding_len, ah0, is_ip6);
- vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
-}
-
-always_inline uword
-ah_decrypt_ipsecmb_inline (vlib_main_t * vm,
- vlib_node_runtime_t * node,
- vlib_frame_t * from_frame, int is_ip6)
-{
- u32 n_left_from, *from, next_index, *to_next;
- ipsec_main_t *im = &ipsec_main;
- ipsecmb_main_t *imbm = &ipsecmb_main;
- ipsec_proto_main_t *em = &ipsec_proto_main;
- from = vlib_frame_vector_args (from_frame);
- n_left_from = from_frame->n_vectors;
- int icv_size = 0;
- u32 thread_index = vlib_get_thread_index ();
- MB_MGR *mgr = imbm->mb_mgr[thread_index];
- u32 packets_in_flight = 0;
-
- next_index = node->cached_next_index;
-
- while (n_left_from > 0 || packets_in_flight > 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;
- u32 next0;
- vlib_buffer_t *b0;
- ah_header_t *ah0;
- ipsec_sa_t *sa0;
- ipsecmb_sa_t *samb0;
- u32 sa_index0 = ~0;
- u32 seq;
- ip4_header_t *ih4 = 0;
- ip6_header_t *ih6 = 0;
- u8 ip_hdr_size = 0;
-
- bi0 = from[0];
- from += 1;
- n_left_from -= 1;
-
- next0 = AH_DECRYPT_NEXT_DROP;
-
- b0 = vlib_get_buffer (vm, bi0);
- ih4 = vlib_buffer_get_current (b0);
- ih6 = vlib_buffer_get_current (b0);
-
- sa_index0 = vnet_buffer (b0)->ipsec.sad_index;
- sa0 = pool_elt_at_index (im->sad, sa_index0);
- samb0 = pool_elt_at_index (imbm->sad, sa_index0);
-
- if (is_ip6)
- {
- ip6_ext_header_t *prev = NULL;
- ip6_ext_header_find_t (ih6, prev, ah0, IP_PROTOCOL_IPSEC_AH);
- ip_hdr_size = sizeof (ip6_header_t);
- ASSERT ((u8 *) ah0 - (u8 *) ih6 == ip_hdr_size);
- }
- else
- {
- ip_hdr_size = ip4_header_bytes (ih4);
- ah0 = (ah_header_t *) (ih4 + 1);
- }
-
- seq = clib_host_to_net_u32 (ah0->seq_no);
- /* anti-replay check */
- // TODO UT remaining
- if (sa0->use_anti_replay)
- {
- int rv = 0;
-
- if (PREDICT_TRUE (sa0->use_esn))
- rv = esp_replay_check_esn (sa0, seq);
- else
- rv = esp_replay_check (sa0, seq);
-
- if (PREDICT_FALSE (rv))
- {
- clib_warning ("anti-replay SPI %u seq %u", sa0->spi, seq);
- vlib_node_increment_counter (vm, node->node_index,
- AH_DECRYPT_ERROR_REPLAY, 1);
- goto trace;
- }
- }
-
- sa0->total_data_size += b0->current_length;
- icv_size =
- em->ipsec_proto_main_integ_algs[sa0->integ_alg].trunc_size;
- if (PREDICT_TRUE (sa0->integ_alg != IPSEC_INTEG_ALG_NONE))
- {
- u8 *icv = (u8 *) vlib_buffer_get_current (b0) + ip_hdr_size +
- sizeof (ah_header_t);
- size_t seq_size = 0;
- if (PREDICT_TRUE (sa0->use_esn))
- {
- *(u32 *) (vlib_buffer_get_current (b0) +
- b0->current_length) = sa0->seq_hi;
- seq_size = sizeof (u32);
- }
- clib_memcpy (vlib_buffer_get_current (b0) + b0->current_length +
- seq_size, icv, icv_size);
- memset (icv, 0, icv_size);
-
- ip_mutable_data_t *md =
- (ip_mutable_data_t *) ((u8 *) vlib_buffer_get_current (b0) +
- b0->current_length + seq_size +
- icv_size);
- if (is_ip6)
- {
- md->ip_version_traffic_class_and_flow_label =
- ih6->ip_version_traffic_class_and_flow_label;
- md->hop_limit = ih6->hop_limit;
- ih6->ip_version_traffic_class_and_flow_label = 0x60;
- ih6->hop_limit = 0;
- }
- else
- {
- md->tos = ih4->tos;
- md->ttl = ih4->ttl;
- ih4->tos = 0;
- ih4->ttl = 0;
- ih4->checksum = 0;
- ih4->flags_and_fragment_offset = 0;
- }
-
- JOB_AES_HMAC *job = IPSECMB_FUNC (get_next_job) (mgr);
- job->src = vlib_buffer_get_current (b0);
- job->hash_start_src_offset_in_bytes = 0;
- job->cipher_mode = NULL_CIPHER;
- job->hash_alg = imbm->integ_algs[sa0->integ_alg].hash_alg;
- job->auth_tag_output_len_in_bytes =
- imbm->integ_algs[sa0->integ_alg].hash_output_length;
- job->auth_tag_output = icv;
- job->msg_len_to_hash_in_bytes = b0->current_length + seq_size;
- job->cipher_direction = DECRYPT;
- job->chain_order = HASH_CIPHER;
- job->u.HMAC._hashed_auth_key_xor_ipad = samb0->ipad_hash;
- job->u.HMAC._hashed_auth_key_xor_opad = samb0->opad_hash;
-
- job->user_data = (void *) (uintptr_t) bi0;
- job->user_data2 = (void *) (uintptr_t) next0;
- vnet_buffer (b0)->ipsec.sad_index = sa_index0;
- job = IPSECMB_FUNC (submit_job) (mgr);
- ++packets_in_flight;
-
- if (!job)
- {
- continue;
- }
- --packets_in_flight;
- ASSERT (STS_COMPLETED == job->status);
- ah_finish_decrypt (vm, node, job, &bi0, &next0, is_ip6);
- }
- else
- {
- remove_ah (vm, node, &bi0, &next0, sa0, ip_hdr_size, icv_size,
- 0, ah0, is_ip6);
- }
- trace:
- to_next[0] = bi0;
- to_next += 1;
- n_left_to_next -= 1;
- if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
- {
- b0->flags |= VLIB_BUFFER_IS_TRACED;
- ah_decrypt_trace_t *tr =
- vlib_add_trace (vm, node, b0, sizeof (*tr));
- tr->integ_alg = sa0->integ_alg;
- }
- vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
- n_left_to_next, bi0, next0);
- }
-
- if (0 == n_left_from)
- {
- JOB_AES_HMAC *job = NULL;
- while (n_left_to_next > 0 && (job = IPSECMB_FUNC (flush_job) (mgr)))
- {
- --packets_in_flight;
- ASSERT (STS_COMPLETED == job->status);
- u32 bi0, next0;
- ah_finish_decrypt (vm, node, job, &bi0, &next0, is_ip6);
- to_next[0] = bi0;
- to_next += 1;
- n_left_to_next -= 1;
- vlib_buffer_t *b0 = vlib_get_buffer (vm, bi0);
- if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
- {
- ipsec_sa_t *sa0 = pool_elt_at_index (im->sad,
- vnet_buffer
- (b0)->ipsec.sad_index);
- b0->flags |= VLIB_BUFFER_IS_TRACED;
- ah_decrypt_trace_t *tr =
- vlib_add_trace (vm, node, b0, sizeof (*tr));
- tr->integ_alg = sa0->integ_alg;
- }
- 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, node->node_index, AH_DECRYPT_ERROR_RX_PKTS,
- from_frame->n_vectors);
-
- return from_frame->n_vectors;
-}
-
-VLIB_NODE_FN (ah4_decrypt_ipsecmb_node) (vlib_main_t * vm,
- vlib_node_runtime_t * node,
- vlib_frame_t * from_frame)
-{
- return ah_decrypt_ipsecmb_inline (vm, node, from_frame, 0 /*is_ip6 */ );
-}
-
-VLIB_NODE_FN (ah6_decrypt_ipsecmb_node) (vlib_main_t * vm,
- vlib_node_runtime_t * node,
- vlib_frame_t * from_frame)
-{
- return ah_decrypt_ipsecmb_inline (vm, node, from_frame, 1 /*is_ip6 */ );
-}
-#endif
-
-/* *INDENT-OFF* */
-VLIB_REGISTER_NODE (ah4_decrypt_ipsecmb_node) = {
- .name = "ah4-decrypt-ipsecmb",
- .vector_size = sizeof (u32),
- .format_trace = format_ah_decrypt_trace,
- .type = VLIB_NODE_TYPE_INTERNAL,
-
- .n_errors = ARRAY_LEN (ah_decrypt_error_strings),
- .error_strings = ah_decrypt_error_strings,
-
- .n_next_nodes = AH_DECRYPT_N_NEXT,
- .next_nodes =
- {
-#define _(s, n) [AH_DECRYPT_NEXT_##s] = n,
- foreach_ah_decrypt_next
-#undef _
- },
-};
-/* *INDENT-ON* */
-
-/* *INDENT-OFF* */
-VLIB_REGISTER_NODE (ah6_decrypt_ipsecmb_node) = {
- .name = "ah6-decrypt-ipsecmb",
- .vector_size = sizeof (u32),
- .format_trace = format_ah_decrypt_trace,
- .type = VLIB_NODE_TYPE_INTERNAL,
-
- .n_errors = ARRAY_LEN (ah_decrypt_error_strings),
- .error_strings = ah_decrypt_error_strings,
-
- .n_next_nodes = AH_DECRYPT_N_NEXT,
- .next_nodes =
- {
-#define _(s, n) [AH_DECRYPT_NEXT_##s] = n,
- foreach_ah_decrypt_next
-#undef _
- },
-};
-/* *INDENT-ON* */
-
-/*
- * fd.io coding-style-patch-verification: ON
- *
- * Local Variables:
- * eval: (c-set-style "gnu")
- * End:
- */
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