--- /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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