diff options
Diffstat (limited to 'src/plugins/ipsecmb/esp_decrypt.c')
| -rw-r--r-- | src/plugins/ipsecmb/esp_decrypt.c | 471 |
1 files changed, 0 insertions, 471 deletions
diff --git a/src/plugins/ipsecmb/esp_decrypt.c b/src/plugins/ipsecmb/esp_decrypt.c deleted file mode 100644 index 835f41eb35d..00000000000 --- a/src/plugins/ipsecmb/esp_decrypt.c +++ /dev/null @@ -1,471 +0,0 @@ -/* - * esp_decrypt.c : ipsecmb ESP 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 <ipsecmb/ipsecmb.h> - -#define foreach_esp_decrypt_next \ -_(DROP, "error-drop") \ -_(IP4_INPUT, "ip4-input") \ -_(IP6_INPUT, "ip6-input") \ -_(IPSEC_GRE_INPUT, "ipsec-gre-input") - -#define _(v, s) ESP_DECRYPT_NEXT_##v, -typedef enum -{ - foreach_esp_decrypt_next -#undef _ - ESP_DECRYPT_N_NEXT, -} esp_decrypt_next_t; - - -#define foreach_esp_decrypt_error \ - _(RX_PKTS, "ESP pkts received") \ - _(NO_BUFFER, "No buffer (packed dropped)") \ - _(DECRYPTION_FAILED, "ESP decryption failed") \ - _(INTEG_ERROR, "Integrity check failed") \ - _(REPLAY, "SA replayed packet") \ - _(NOT_IP, "Not IP packet (dropped)") - -typedef enum -{ -#define _(sym,str) ESP_DECRYPT_ERROR_##sym, - foreach_esp_decrypt_error -#undef _ - ESP_DECRYPT_N_ERROR, -} esp_decrypt_error_t; - -static char *esp_decrypt_error_strings[] = { -#define _(sym,string) string, - foreach_esp_decrypt_error -#undef _ -}; - -typedef struct -{ - ipsec_crypto_alg_t crypto_alg; - ipsec_integ_alg_t integ_alg; -} esp_decrypt_trace_t; - -/* packet trace format function */ -static u8 * -format_esp_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 *); - esp_decrypt_trace_t *t = va_arg (*args, esp_decrypt_trace_t *); - - s = format (s, "esp: crypto %U integrity %U", - format_ipsec_crypto_alg, t->crypto_alg, - format_ipsec_integ_alg, t->integ_alg); - return s; -} - -#ifdef CLIB_MARCH_VARIANT -always_inline void -esp_finish_decrypt (vlib_main_t * vm, vlib_node_runtime_t * node, - JOB_AES_HMAC * job, u32 * next0, ipsec_sa_t * sa0, - int is_ip6) -{ - u32 bi0 = (uintptr_t) job->user_data; - vlib_buffer_t *b0 = vlib_get_buffer (vm, bi0); - esp_footer_t *f0; - ip4_header_t *ih4 = vlib_buffer_get_current (b0); - ip6_header_t *ih6 = vlib_buffer_get_current (b0); - - if (NULL_HASH != job->hash_alg) - { - if (0 != - memcmp (job->auth_tag_output, - job->auth_tag_output - job->auth_tag_output_len_in_bytes, - job->auth_tag_output_len_in_bytes)) - { - vlib_node_increment_counter (vm, node->node_index, - ESP_DECRYPT_ERROR_INTEG_ERROR, 1); - *next0 = ESP_DECRYPT_NEXT_DROP; - return; - } - } - - f0 = (esp_footer_t *) ((u8 *) vlib_buffer_get_current (b0) + - b0->current_length); - b0->current_length -= f0->pad_length; - - /* tunnel mode */ - if (sa0->is_tunnel) - { - if (f0->next_header == IP_PROTOCOL_IP_IN_IP) - { - *next0 = ESP_DECRYPT_NEXT_IP4_INPUT; - } - else if (f0->next_header == IP_PROTOCOL_IPV6) - { - *next0 = ESP_DECRYPT_NEXT_IP6_INPUT; - } - else - { - vlib_node_increment_counter (vm, node->node_index, - ESP_DECRYPT_ERROR_DECRYPTION_FAILED, - 1); - *next0 = ESP_DECRYPT_NEXT_DROP; - return; - } - } - /* transport mode */ - else - { - if (is_ip6) - { - *next0 = ESP_DECRYPT_NEXT_IP6_INPUT; - ih6->protocol = f0->next_header; - ih6->payload_length = - clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0) - - sizeof (ip6_header_t)); - } - else - { - *next0 = ESP_DECRYPT_NEXT_IP4_INPUT; - ih4->fragment_id = 0; - ih4->flags_and_fragment_offset = 0; - ih4->protocol = f0->next_header; - 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 ((vnet_buffer (b0)->ipsec.flags & IPSEC_FLAG_IPSEC_GRE_TUNNEL)) - { - *next0 = ESP_DECRYPT_NEXT_IPSEC_GRE_INPUT; - } - - vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0; - if (sa0->use_anti_replay) - { - if (sa0->use_esn) - esp_replay_advance_esn (sa0, vnet_buffer (b0)->ipsec.seq); - else - esp_replay_advance (sa0, vnet_buffer (b0)->ipsec.seq); - } -} - -always_inline uword -esp_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; - u32 packets_in_flight = 0; - 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; - u32 thread_index = vlib_get_thread_index (); - MB_MGR *mgr = imbm->mb_mgr[thread_index]; - u32 *to_be_freed = NULL; - - 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, next0; - vlib_buffer_t *b0; - esp_header_t *esp0; - ipsec_sa_t *sa0; - ipsecmb_sa_t *samb0; - u32 sa_index0 = ~0; - u32 seq; - - bi0 = from[0]; - from += 1; - n_left_from -= 1; - - next0 = ESP_DECRYPT_NEXT_DROP; - - b0 = vlib_get_buffer (vm, bi0); - esp0 = 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); - - vnet_buffer (b0)->ipsec.seq = seq = - clib_host_to_net_u32 (esp0->seq); - - /* anti-replay check */ - if (sa0->use_anti_replay) - { - int rv = 0; - - if (sa0->use_esn) - rv = esp_replay_check_esn (sa0, seq); - else - rv = esp_replay_check (sa0, seq); - - if (PREDICT_FALSE (rv)) - { - vlib_node_increment_counter (vm, node->node_index, - ESP_DECRYPT_ERROR_REPLAY, 1); - goto trace; - } - } - - sa0->total_data_size += b0->current_length; - - if (PREDICT_FALSE (b0->n_add_refs > 0)) - { - vec_add1 (to_be_freed, bi0); - b0 = vlib_buffer_copy (vm, b0); - bi0 = vlib_get_buffer_index (vm, b0); - } - - JOB_AES_HMAC *job = IPSECMB_FUNC (get_next_job) (mgr); - int trunc_size = 0; - if (sa0->integ_alg != IPSEC_INTEG_ALG_NONE) - { - trunc_size = - em->ipsec_proto_main_integ_algs[sa0->integ_alg].trunc_size; - // put calculated auth tag after in-packet auth tag - job->auth_tag_output = - vlib_buffer_get_current (b0) + b0->current_length; - b0->current_length -= trunc_size; - job->msg_len_to_hash_in_bytes = b0->current_length; - job->auth_tag_output_len_in_bytes = trunc_size; - job->u.HMAC._hashed_auth_key_xor_ipad = samb0->ipad_hash; - job->u.HMAC._hashed_auth_key_xor_opad = samb0->opad_hash; - } - - job->hash_alg = imbm->integ_algs[sa0->integ_alg].hash_alg; - u8 ip_hdr_size = 0; - - if ((sa0->crypto_alg >= IPSEC_CRYPTO_ALG_AES_CBC_128 && - sa0->crypto_alg <= IPSEC_CRYPTO_ALG_AES_CBC_256) || - (sa0->crypto_alg >= IPSEC_CRYPTO_ALG_DES_CBC && - sa0->crypto_alg <= IPSEC_CRYPTO_ALG_3DES_CBC)) - { - const int block_size = - em->ipsec_proto_main_crypto_algs[sa0->crypto_alg].block_size; - const int iv_size = - em->ipsec_proto_main_crypto_algs[sa0->crypto_alg].iv_size; - - int blocks = - (b0->current_length - sizeof (esp_header_t) - - iv_size) / block_size; - if (b0->current_length - sizeof (esp_header_t) - iv_size < - block_size || blocks <= 0) - { - vlib_node_increment_counter (vm, node->node_index, - ESP_DECRYPT_ERROR_INTEG_ERROR, - 1); - goto trace; - } - - /* transport mode */ - if (!sa0->is_tunnel) - { - if (b0->flags & VNET_BUFFER_F_L3_HDR_OFFSET_VALID) - { - if (is_ip6) - { - ip_hdr_size = sizeof (ip6_header_t); - } - else - { - ip_hdr_size = sizeof (ip4_header_t); - } - } - else - { - vlib_node_increment_counter (vm, node->node_index, - ESP_DECRYPT_ERROR_NOT_IP, - 1); - goto trace; - } - } - - job->chain_order = HASH_CIPHER; - job->cipher_direction = DECRYPT; - job->src = (u8 *) esp0; - job->dst = (u8 *) esp0; - vlib_buffer_advance (b0, -ip_hdr_size); - job->cipher_mode = - imbm->crypto_algs[sa0->crypto_alg].cipher_mode; - job->aes_enc_key_expanded = samb0->aes_enc_key_expanded; - job->aes_dec_key_expanded = samb0->aes_dec_key_expanded; - job->aes_key_len_in_bytes = sa0->crypto_key_len; - job->iv = esp0->data; - job->iv_len_in_bytes = iv_size; - job->msg_len_to_cipher_in_bytes = blocks * block_size; - job->cipher_start_src_offset_in_bytes = - sizeof (esp_header_t) + iv_size; - job->hash_start_src_offset_in_bytes = 0; - - job->user_data = (void *) (uintptr_t) bi0; - job->user_data2 = sa0; - b0->current_length = - (blocks * block_size) - sizeof (esp_footer_t) + ip_hdr_size; - ASSERT ((u8 *) vlib_buffer_get_current (b0) + - b0->current_length < job->auth_tag_output); - b0->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID; - - job = IPSECMB_FUNC (submit_job) (mgr); - ++packets_in_flight; - - if (!job) - { - continue; - } - - --packets_in_flight; - - sa0 = job->user_data2; - bi0 = (uintptr_t) job->user_data; - b0 = vlib_get_buffer (vm, bi0); - esp_finish_decrypt (vm, node, job, &next0, sa0, is_ip6); - - trace: - to_next[0] = bi0; - to_next += 1; - n_left_to_next -= 1; - - if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) - { - esp_decrypt_trace_t *tr = - vlib_add_trace (vm, node, b0, sizeof (*tr)); - tr->crypto_alg = sa0->crypto_alg; - tr->integ_alg = sa0->integ_alg; - } - - vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, - n_left_to_next, bi0, next0); - } - } - - if (PREDICT_FALSE (n_left_from == 0 && packets_in_flight > 0)) - { - JOB_AES_HMAC *job = NULL; - while (n_left_to_next > 0 && (job = IPSECMB_FUNC (flush_job) (mgr))) - { - --packets_in_flight; - u32 bi0, next0; - bi0 = (uintptr_t) job->user_data; - vlib_buffer_t *i_b0 = vlib_get_buffer (vm, bi0); - - ipsec_sa_t *sa0 = job->user_data2; - esp_finish_decrypt (vm, node, job, &next0, sa0, is_ip6); - - to_next[0] = bi0; - to_next += 1; - n_left_to_next -= 1; - - if (PREDICT_FALSE (i_b0->flags & VLIB_BUFFER_IS_TRACED)) - { - esp_decrypt_trace_t *tr = - vlib_add_trace (vm, node, i_b0, sizeof (*tr)); - tr->crypto_alg = sa0->crypto_alg; - 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, - ESP_DECRYPT_ERROR_RX_PKTS, - from_frame->n_vectors); - - if (to_be_freed) - vlib_buffer_free (vm, to_be_freed, vec_len (to_be_freed)); - vec_free (to_be_freed); - return from_frame->n_vectors; -} - -VLIB_NODE_FN (esp4_decrypt_ipsecmb_node) (vlib_main_t * vm, - vlib_node_runtime_t * node, - vlib_frame_t * from_frame) -{ - return esp_decrypt_ipsecmb_inline (vm, node, from_frame, 0 /*is_ip6 */ ); -} - -VLIB_NODE_FN (esp6_decrypt_ipsecmb_node) (vlib_main_t * vm, - vlib_node_runtime_t * node, - vlib_frame_t * from_frame) -{ - return esp_decrypt_ipsecmb_inline (vm, node, from_frame, 1 /*is_ip6 */ ); -} -#endif - -/* *INDENT-OFF* */ -VLIB_REGISTER_NODE (esp4_decrypt_ipsecmb_node) = { - .name = "esp4-decrypt-ipsecmb", - .vector_size = sizeof (u32), - .format_trace = format_esp_decrypt_trace, - .type = VLIB_NODE_TYPE_INTERNAL, - - .n_errors = ARRAY_LEN(esp_decrypt_error_strings), - .error_strings = esp_decrypt_error_strings, - - .n_next_nodes = ESP_DECRYPT_N_NEXT, - .next_nodes = { -#define _(s,n) [ESP_DECRYPT_NEXT_##s] = n, - foreach_esp_decrypt_next -#undef _ - }, -}; -/* *INDENT-ON* */ - -/* *INDENT-OFF* */ -VLIB_REGISTER_NODE (esp6_decrypt_ipsecmb_node) = { - .name = "esp6-decrypt-ipsecmb", - .vector_size = sizeof (u32), - .format_trace = format_esp_decrypt_trace, - .type = VLIB_NODE_TYPE_INTERNAL, - - .n_errors = ARRAY_LEN(esp_decrypt_error_strings), - .error_strings = esp_decrypt_error_strings, - - .n_next_nodes = ESP_DECRYPT_N_NEXT, - .next_nodes = { -#define _(s,n) [ESP_DECRYPT_NEXT_##s] = n, - foreach_esp_decrypt_next -#undef _ - }, -}; -/* *INDENT-ON* */ - -/* - * fd.io coding-style-patch-verification: ON - * - * Local Variables: - * eval: (c-set-style "gnu") - * End: - */ |