+++ /dev/null
-/*
- * 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:
- */
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