+++ /dev/null
-/*
- * ah_encrypt.c : ipsecmb 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 <ipsecmb/ipsecmb.h>
-
-#define foreach_ah_encrypt_next \
-_(DROP, "error-drop") \
-_(IP4_LOOKUP, "ip4-lookup") \
-_(IP6_LOOKUP, "ip6-lookup") \
-_(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") \
- _(SEQ_CYCLED, "sequence number cycled")
-
-
-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 spi;
- u32 seq;
- 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: spi %u seq %u integrity %U",
- t->spi, t->seq, format_ipsec_integ_alg, t->integ_alg);
- return s;
-}
-
-#ifdef CLIB_MARCH_VARIANT
-always_inline void
-ah_finish_encrypt (vlib_main_t * vm, vlib_buffer_t * b0, ipsec_sa_t * sa0,
- int is_ip6)
-{
- if (is_ip6)
- {
- ip6_header_t *oh6 = 0;
- oh6 = vlib_buffer_get_current (b0);
- oh6->ip_version_traffic_class_and_flow_label =
- vnet_buffer (b0)->ipsec.ip_version_traffic_class_and_flow_label;
- oh6->hop_limit = vnet_buffer (b0)->ipsec.ttl_or_hop_limit;
- }
- else
- {
- ip4_header_t *oh4 = 0;
- oh4 = vlib_buffer_get_current (b0);
- oh4->ttl = vnet_buffer (b0)->ipsec.ttl_or_hop_limit;
- oh4->tos = vnet_buffer (b0)->ipsec.tos;
- oh4->checksum = ip4_header_checksum (oh4);
- }
-}
-
-always_inline uword
-ah_encrypt_ipsecmb_inline (vlib_main_t * vm,
- vlib_node_runtime_t * node,
- vlib_frame_t * from_frame, int is_ip6)
-{
- u32 n_left_from, *from, *to_next = 0, next_index;
- int icv_size = 0;
- from = vlib_frame_vector_args (from_frame);
- n_left_from = from_frame->n_vectors;
- ipsec_main_t *im = &ipsec_main;
- ipsecmb_main_t *imbm = &ipsecmb_main;
- ipsec_proto_main_t *em = &ipsec_proto_main;
- next_index = node->cached_next_index;
- u32 thread_index = vlib_get_thread_index ();
- MB_MGR *mgr = imbm->mb_mgr[thread_index];
- u32 packets_in_flight = 0;
-
- 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 = 0;
- u32 sa_index0;
- ipsec_sa_t *sa0;
- ipsecmb_sa_t *samb0;
- ip4_header_t *ih4, *oh4 = 0;
- ip6_header_t *ih6, *oh6 = 0;
- ah_header_t *ah = 0;
- u8 next_hdr_type;
- u8 transport_mode = 0;
-
- bi0 = from[0];
- from += 1;
- n_left_from -= 1;
-
- next0 = AH_ENCRYPT_NEXT_DROP;
-
- b0 = vlib_get_buffer (vm, bi0);
- 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 (PREDICT_FALSE (esp_seq_advance (sa0)))
- {
- clib_warning ("sequence number counter has cycled SPI %u",
- sa0->spi);
- vlib_node_increment_counter (vm, node->node_index,
- AH_ENCRYPT_ERROR_SEQ_CYCLED, 1);
- to_next[0] = bi0;
- to_next += 1;
- goto trace;
- }
-
-
- sa0->total_data_size += b0->current_length;
-
- ssize_t adv;
- ih4 = vlib_buffer_get_current (b0);
-
- if (PREDICT_TRUE (sa0->is_tunnel))
- {
- if (!is_ip6)
- adv = -sizeof (ip4_and_ah_header_t);
- else
- adv = -sizeof (ip6_and_ah_header_t);
- }
- else
- {
- adv = -sizeof (ah_header_t);
- }
-
- const u8 padding_len = ah_calc_icv_padding_len (icv_size, is_ip6);
- adv -= padding_len;
-
- icv_size =
- em->ipsec_proto_main_integ_algs[sa0->integ_alg].trunc_size;
- /* transport mode save the eth header before it is overwritten */
- if (PREDICT_FALSE (!sa0->is_tunnel))
- {
- ethernet_header_t *ieh0 = (ethernet_header_t *)
- ((u8 *) vlib_buffer_get_current (b0) -
- sizeof (ethernet_header_t));
- ethernet_header_t *oeh0 =
- (ethernet_header_t *) ((u8 *) ieh0 + (adv - icv_size));
- clib_memcpy (oeh0, ieh0, sizeof (ethernet_header_t));
- }
-
- vlib_buffer_advance (b0, adv - icv_size);
-
- if (is_ip6)
- {
- ih6 = (ip6_header_t *) ih4;
- oh6 = vlib_buffer_get_current (b0);
- ah = (ah_header_t *) (oh6 + 1);
- vnet_buffer (b0)->ipsec.ttl_or_hop_limit = ih6->hop_limit;
- vnet_buffer (b0)->
- ipsec.ip_version_traffic_class_and_flow_label =
- ih6->ip_version_traffic_class_and_flow_label;
-
- if (PREDICT_TRUE (sa0->is_tunnel))
- {
- next_hdr_type = IP_PROTOCOL_IPV6;
- }
- else
- {
- next_hdr_type = ih6->protocol;
- memmove (oh6, ih6, sizeof (ip6_header_t));
- }
-
- oh6->protocol = IP_PROTOCOL_IPSEC_AH;
- oh6->ip_version_traffic_class_and_flow_label = 0x60;
- oh6->hop_limit = 0;
- ah->reserved = 0;
- ah->nexthdr = next_hdr_type;
- ah->spi = clib_net_to_host_u32 (sa0->spi);
- ah->seq_no = clib_net_to_host_u32 (sa0->seq);
- ah->hdrlen =
- (sizeof (ah_header_t) + icv_size + padding_len) / 4 - 2;
- oh6->payload_length =
- clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0) -
- sizeof (ip6_header_t));
- }
- else
- {
- oh4 = vlib_buffer_get_current (b0);
- memset (oh4, 0, sizeof (*oh4));
- ah = (ah_header_t *) (oh4 + 1);
- memset (ah, 0, sizeof (*ah));
- vnet_buffer (b0)->ipsec.ttl_or_hop_limit = ih4->ttl;
- vnet_buffer (b0)->ipsec.tos = ih4->tos;
-
- if (PREDICT_TRUE (sa0->is_tunnel))
- {
- next_hdr_type = IP_PROTOCOL_IP_IN_IP;
- }
- else
- {
- next_hdr_type = ih4->protocol;
- memmove (oh4, ih4, sizeof (ip4_header_t));
- }
-
- oh4->length =
- clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0));
- oh4->ip_version_and_header_length = 0x45;
- oh4->fragment_id = 0;
- oh4->flags_and_fragment_offset = 0;
- oh4->ttl = 0;
- oh4->tos = 0;
- oh4->protocol = IP_PROTOCOL_IPSEC_AH;
- ah->spi = clib_net_to_host_u32 (sa0->spi);
- ah->seq_no = clib_net_to_host_u32 (sa0->seq);
- oh4->checksum = 0;
- ah->nexthdr = next_hdr_type;
- ah->hdrlen =
- (sizeof (ah_header_t) + icv_size + padding_len) / 4 - 2;
- }
-
- if (PREDICT_TRUE (!is_ip6 && sa0->is_tunnel && !sa0->is_tunnel_ip6))
- {
- oh4->src_address.as_u32 = sa0->tunnel_src_addr.ip4.as_u32;
- oh4->dst_address.as_u32 = sa0->tunnel_dst_addr.ip4.as_u32;
-
- next0 = AH_ENCRYPT_NEXT_IP4_LOOKUP;
- vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
- }
- else if (is_ip6 && sa0->is_tunnel && sa0->is_tunnel_ip6)
- {
- oh6->src_address.as_u64[0] = sa0->tunnel_src_addr.ip6.as_u64[0];
- oh6->src_address.as_u64[1] = sa0->tunnel_src_addr.ip6.as_u64[1];
- oh6->dst_address.as_u64[0] = sa0->tunnel_dst_addr.ip6.as_u64[0];
- oh6->dst_address.as_u64[1] = sa0->tunnel_dst_addr.ip6.as_u64[1];
- next0 = AH_ENCRYPT_NEXT_IP6_LOOKUP;
- vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
- }
- else
- {
- transport_mode = 1;
- }
-
- memset (ah + 1, 0, icv_size);
-
- 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 = (u8 *) (ah + 1);
- if (PREDICT_TRUE (sa0->use_esn))
- {
- *(u32 *) (vlib_buffer_get_current (b0) + b0->current_length) =
- sa0->seq_hi;
- b0->current_length += sizeof (u32);
- }
- job->msg_len_to_hash_in_bytes = b0->current_length;
- job->cipher_direction = ENCRYPT;
- 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);
- bi0 = (uintptr_t) job->user_data;
- next0 = (uintptr_t) job->user_data2;
- b0 = vlib_get_buffer (vm, bi0);
- sa0 =
- pool_elt_at_index (im->sad, vnet_buffer (b0)->ipsec.sad_index);
- ah_finish_encrypt (vm, b0, sa0, is_ip6);
- if (!sa0->is_tunnel && !sa0->is_tunnel_ip6)
- {
- next0 = AH_ENCRYPT_NEXT_INTERFACE_OUTPUT;
- vlib_buffer_advance (b0, -sizeof (ethernet_header_t));
- }
-
- to_next[0] = bi0;
- to_next += 1;
- n_left_to_next -= 1;
-
- trace:
- if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
- {
- ah_encrypt_trace_t *tr =
- vlib_add_trace (vm, node, b0, sizeof (*tr));
- tr->spi = sa0->spi;
- tr->seq = sa0->seq - 1;
- 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))
- {
- JOB_AES_HMAC *job = NULL;
- while (n_left_to_next > 0 && (job = IPSECMB_FUNC (flush_job) (mgr)))
- {
- --packets_in_flight;
- u32 bi0, next0;
- vlib_buffer_t *b0;
- ipsec_sa_t *sa0;
-
- ASSERT (STS_COMPLETED == job->status);
- bi0 = (uintptr_t) job->user_data;
- next0 = (uintptr_t) job->user_data2;
- b0 = vlib_get_buffer (vm, bi0);
- sa0 =
- pool_elt_at_index (im->sad,
- vnet_buffer (b0)->ipsec.sad_index);
- ah_finish_encrypt (vm, b0, sa0, is_ip6);
- if (!sa0->is_tunnel && !sa0->is_tunnel_ip6)
- {
- next0 = AH_ENCRYPT_NEXT_INTERFACE_OUTPUT;
- vlib_buffer_advance (b0, -sizeof (ethernet_header_t));
- }
-
- to_next[0] = bi0;
- to_next += 1;
- n_left_to_next -= 1;
-
- if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
- {
- ah_encrypt_trace_t *tr =
- vlib_add_trace (vm, node, b0, sizeof (*tr));
- tr->spi = sa0->spi;
- tr->seq = sa0->seq - 1;
- 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_ENCRYPT_ERROR_RX_PKTS,
- from_frame->n_vectors);
-
- return from_frame->n_vectors;
-}
-
-VLIB_NODE_FN (ah4_encrypt_ipsecmb_node) (vlib_main_t * vm,
- vlib_node_runtime_t * node,
- vlib_frame_t * from_frame)
-{
- return ah_encrypt_ipsecmb_inline (vm, node, from_frame, 0 /*is_ip6 */ );
-}
-
-VLIB_NODE_FN (ah6_encrypt_ipsecmb_node) (vlib_main_t * vm,
- vlib_node_runtime_t * node,
- vlib_frame_t * from_frame)
-{
- return ah_encrypt_ipsecmb_inline (vm, node, from_frame, 1 /*is_ip6 */ );
-}
-
-#endif
-
-/* *INDENT-OFF* */
-VLIB_REGISTER_NODE (ah4_encrypt_ipsecmb_node) = {
- .name = "ah4-encrypt-ipsecmb",
- .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 = {
-#define _(s,n) [AH_ENCRYPT_NEXT_##s] = n,
- foreach_ah_encrypt_next
-#undef _
- },
-};
-/* *INDENT-ON* */
-
-/* *INDENT-OFF* */
-VLIB_REGISTER_NODE (ah6_encrypt_ipsecmb_node) = {
- .name = "ah6-encrypt-ipsecmb",
- .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 = {
-#define _(s,n) [AH_ENCRYPT_NEXT_##s] = n,
- foreach_ah_encrypt_next
-#undef _
- },
-};
-/* *INDENT-ON* */
-
-/*
- * fd.io coding-style-patch-verification: ON
- *
- * Local Variables:
- * eval: (c-set-style "gnu")
- * End:
- */
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