diff options
Diffstat (limited to 'src/vnet/ipsec/ah_encrypt.c')
| -rw-r--r-- | src/vnet/ipsec/ah_encrypt.c | 344 |
1 files changed, 344 insertions, 0 deletions
diff --git a/src/vnet/ipsec/ah_encrypt.c b/src/vnet/ipsec/ah_encrypt.c new file mode 100644 index 00000000000..6619d872013 --- /dev/null +++ b/src/vnet/ipsec/ah_encrypt.c @@ -0,0 +1,344 @@ +/* + * ah_encrypt.c : IPSec 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> + +#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 _ +}; + +vlib_node_registration_t ah_encrypt_node; + +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; +} + +static uword +ah_encrypt_node_fn (vlib_main_t * vm, + vlib_node_runtime_t * node, vlib_frame_t * from_frame) +{ + 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; + ipsec_proto_main_t *em = &ipsec_proto_main; + next_index = node->cached_next_index; + + while (n_left_from > 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 i_bi0, next0; + vlib_buffer_t *i_b0 = 0; + u32 sa_index0; + ipsec_sa_t *sa0; + ip4_and_ah_header_t *ih0, *oh0 = 0; + ip6_and_ah_header_t *ih6_0, *oh6_0 = 0; + u8 is_ipv6; + u8 ip_hdr_size; + u8 next_hdr_type; + u8 transport_mode = 0; + u8 tos = 0; + u8 ttl = 0; + + i_bi0 = from[0]; + from += 1; + n_left_from -= 1; + n_left_to_next -= 1; + next0 = AH_ENCRYPT_NEXT_DROP; + + i_b0 = vlib_get_buffer (vm, i_bi0); + to_next[0] = i_bi0; + to_next += 1; + sa_index0 = vnet_buffer (i_b0)->ipsec.sad_index; + sa0 = pool_elt_at_index (im->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, ah_encrypt_node.index, + AH_ENCRYPT_ERROR_SEQ_CYCLED, 1); + //TODO need to confirm if below is needed + to_next[0] = i_bi0; + to_next += 1; + goto trace; + } + + + sa0->total_data_size += i_b0->current_length; + + ssize_t adv; + ih0 = vlib_buffer_get_current (i_b0); + ttl = ih0->ip4.ttl; + tos = ih0->ip4.tos; + + is_ipv6 = (ih0->ip4.ip_version_and_header_length & 0xF0) == 0x60; + /* is ipv6 */ + if (PREDICT_TRUE (sa0->is_tunnel)) + { + if (PREDICT_TRUE (!is_ipv6)) + adv = -sizeof (ip4_and_ah_header_t); + else + adv = -sizeof (ip6_and_ah_header_t); + } + else + { + adv = -sizeof (ah_header_t); + } + + 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 (i_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 (i_b0, adv - icv_size); + + /* is ipv6 */ + if (PREDICT_FALSE (is_ipv6)) + { + ih6_0 = (ip6_and_ah_header_t *) ih0; + ip_hdr_size = sizeof (ip6_header_t); + oh6_0 = vlib_buffer_get_current (i_b0); + + if (PREDICT_TRUE (sa0->is_tunnel)) + { + next_hdr_type = IP_PROTOCOL_IPV6; + oh6_0->ip6.ip_version_traffic_class_and_flow_label = + ih6_0->ip6.ip_version_traffic_class_and_flow_label; + } + else + { + next_hdr_type = ih6_0->ip6.protocol; + memmove (oh6_0, ih6_0, sizeof (ip6_header_t)); + } + + oh6_0->ip6.protocol = IP_PROTOCOL_IPSEC_AH; + oh6_0->ip6.hop_limit = 254; + oh6_0->ah.spi = clib_net_to_host_u32 (sa0->spi); + oh6_0->ah.seq_no = clib_net_to_host_u32 (sa0->seq); + oh6_0->ip6.payload_length = + clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, i_b0) - + sizeof (ip6_header_t)); + } + else + { + ip_hdr_size = sizeof (ip4_header_t); + oh0 = vlib_buffer_get_current (i_b0); + memset (oh0, 0, sizeof (ip4_and_ah_header_t)); + + if (PREDICT_TRUE (sa0->is_tunnel)) + { + next_hdr_type = IP_PROTOCOL_IP_IN_IP; + } + else + { + next_hdr_type = ih0->ip4.protocol; + memmove (oh0, ih0, sizeof (ip4_header_t)); + } + + oh0->ip4.length = + clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, i_b0)); + oh0->ip4.ip_version_and_header_length = 0x45; + oh0->ip4.fragment_id = 0; + oh0->ip4.flags_and_fragment_offset = 0; + oh0->ip4.ttl = 0; + oh0->ip4.tos = 0; + oh0->ip4.protocol = IP_PROTOCOL_IPSEC_AH; + oh0->ah.spi = clib_net_to_host_u32 (sa0->spi); + oh0->ah.seq_no = clib_net_to_host_u32 (sa0->seq); + oh0->ip4.checksum = 0; + oh0->ah.nexthdr = next_hdr_type; + oh0->ah.hdrlen = 4; + } + + + + if (PREDICT_TRUE + (!is_ipv6 && sa0->is_tunnel && !sa0->is_tunnel_ip6)) + { + oh0->ip4.src_address.as_u32 = sa0->tunnel_src_addr.ip4.as_u32; + oh0->ip4.dst_address.as_u32 = sa0->tunnel_dst_addr.ip4.as_u32; + + next0 = AH_ENCRYPT_NEXT_IP4_LOOKUP; + vnet_buffer (i_b0)->sw_if_index[VLIB_TX] = (u32) ~ 0; + } + else if (is_ipv6 && sa0->is_tunnel && sa0->is_tunnel_ip6) + { + oh6_0->ip6.src_address.as_u64[0] = + sa0->tunnel_src_addr.ip6.as_u64[0]; + oh6_0->ip6.src_address.as_u64[1] = + sa0->tunnel_src_addr.ip6.as_u64[1]; + oh6_0->ip6.dst_address.as_u64[0] = + sa0->tunnel_dst_addr.ip6.as_u64[0]; + oh6_0->ip6.dst_address.as_u64[1] = + sa0->tunnel_dst_addr.ip6.as_u64[1]; + + next0 = AH_ENCRYPT_NEXT_IP6_LOOKUP; + vnet_buffer (i_b0)->sw_if_index[VLIB_TX] = (u32) ~ 0; + } + else + { + transport_mode = 1; + next0 = AH_ENCRYPT_NEXT_INTERFACE_OUTPUT; + } + + u8 sig[64]; + memset (sig, 0, sizeof (sig)); + u8 *digest = NULL; + { + digest = vlib_buffer_get_current (i_b0) + ip_hdr_size + icv_size; + memset (digest, 0, icv_size); + } + + hmac_calc (sa0->integ_alg, sa0->integ_key, + sa0->integ_key_len, + (u8 *) vlib_buffer_get_current (i_b0), + i_b0->current_length, sig, sa0->use_esn, sa0->seq_hi); + + memcpy (digest, (char *) &sig[0], 12); + + if (PREDICT_FALSE (is_ipv6)) + { + } + else + { + oh0->ip4.ttl = ttl; + oh0->ip4.tos = tos; + oh0->ip4.checksum = ip4_header_checksum (&oh0->ip4); + } + + if (transport_mode) + vlib_buffer_advance (i_b0, -sizeof (ethernet_header_t));; + + trace: + if (PREDICT_FALSE (i_b0->flags & VLIB_BUFFER_IS_TRACED)) + { + i_b0->flags |= VLIB_BUFFER_IS_TRACED; + ah_encrypt_trace_t *tr = + vlib_add_trace (vm, node, i_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, i_bi0, + next0); + } + vlib_put_next_frame (vm, node, next_index, n_left_to_next); + } + vlib_node_increment_counter (vm, ah_encrypt_node.index, + AH_ENCRYPT_ERROR_RX_PKTS, + from_frame->n_vectors); + + return from_frame->n_vectors; +} + + +/* *INDENT-OFF* */ +VLIB_REGISTER_NODE (ah_encrypt_node) = { + .function = ah_encrypt_node_fn, + .name = "ah-encrypt", + .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* */ + +VLIB_NODE_FUNCTION_MULTIARCH (ah_encrypt_node, ah_encrypt_node_fn) +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ |