diff options
Diffstat (limited to 'src/plugins/ipsecmb/ah_decrypt.c')
| -rw-r--r-- | src/plugins/ipsecmb/ah_decrypt.c | 493 |
1 files changed, 0 insertions, 493 deletions
diff --git a/src/plugins/ipsecmb/ah_decrypt.c b/src/plugins/ipsecmb/ah_decrypt.c deleted file mode 100644 index e991671aa63..00000000000 --- a/src/plugins/ipsecmb/ah_decrypt.c +++ /dev/null @@ -1,493 +0,0 @@ -/* - * 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: - */ |