2 * ipsec_if_in.c : IPSec interface input node
4 * Copyright (c) 2015 Cisco and/or its affiliates.
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at:
9 * http://www.apache.org/licenses/LICENSE-2.0
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
18 #include <vnet/vnet.h>
19 #include <vnet/api_errno.h>
20 #include <vnet/ip/ip.h>
22 #include <vnet/ipsec/ipsec.h>
23 #include <vnet/ipsec/esp.h>
25 /* Statistics (not really errors) */
26 #define foreach_ipsec_if_input_error \
27 _(RX, "good packets received")
29 static char *ipsec_if_input_error_strings[] = {
30 #define _(sym,string) string,
31 foreach_ipsec_if_input_error
37 #define _(sym,str) IPSEC_IF_INPUT_ERROR_##sym,
38 foreach_ipsec_if_input_error
40 IPSEC_IF_INPUT_N_ERROR,
41 } ipsec_if_input_error_t;
48 } ipsec_if_input_trace_t;
51 format_ipsec_if_input_trace (u8 * s, va_list * args)
53 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
54 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
55 ipsec_if_input_trace_t *t = va_arg (*args, ipsec_if_input_trace_t *);
57 s = format (s, "IPSec: spi %u seq %u", t->spi, t->seq);
62 ipsec_if_input_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
63 vlib_frame_t * from_frame)
65 ipsec_main_t *im = &ipsec_main;
66 u32 *from, *to_next = 0, next_index;
69 from = vlib_frame_vector_args (from_frame);
70 n_left_from = from_frame->n_vectors;
71 next_index = node->cached_next_index;
73 while (n_left_from > 0)
77 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
79 while (n_left_from > 0 && n_left_to_next > 0)
87 bi0 = to_next[0] = from[0];
92 b0 = vlib_get_buffer (vm, bi0);
93 ip0 = vlib_buffer_get_current (b0);
94 esp0 = (esp_header_t *) ((u8 *) ip0 + ip4_header_bytes (ip0));
96 next0 = IPSEC_INPUT_NEXT_DROP;
98 u64 key = (u64) ip0->src_address.as_u32 << 32 |
99 (u64) clib_net_to_host_u32 (esp0->spi);
101 p = hash_get (im->ipsec_if_pool_index_by_key, key);
105 ipsec_tunnel_if_t *t;
106 t = pool_elt_at_index (im->tunnel_interfaces, p[0]);
107 vnet_buffer (b0)->ipsec.sad_index = t->input_sa_index;
108 vnet_buffer (b0)->ipsec.flags =
109 t->hw_if_index == ~0 ? IPSEC_FLAG_IPSEC_GRE_TUNNEL : 0;
110 vlib_buffer_advance (b0, ip4_header_bytes (ip0));
111 next0 = im->esp_decrypt_next_index;
114 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
116 ipsec_if_input_trace_t *tr =
117 vlib_add_trace (vm, node, b0, sizeof (*tr));
118 tr->spi = clib_host_to_net_u32 (esp0->spi);
119 tr->seq = clib_host_to_net_u32 (esp0->seq);
122 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
123 n_left_to_next, bi0, next0);
125 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
128 vlib_node_increment_counter (vm, ipsec_if_input_node.index,
129 IPSEC_IF_INPUT_ERROR_RX,
130 from_frame->n_vectors);
132 return from_frame->n_vectors;
136 VLIB_REGISTER_NODE (ipsec_if_input_node) = {
137 .function = ipsec_if_input_node_fn,
138 .name = "ipsec-if-input",
139 .vector_size = sizeof (u32),
140 .format_trace = format_ipsec_if_input_trace,
141 .type = VLIB_NODE_TYPE_INTERNAL,
143 .n_errors = ARRAY_LEN(ipsec_if_input_error_strings),
144 .error_strings = ipsec_if_input_error_strings,
146 .sibling_of = "ipsec-input-ip4",
150 VLIB_NODE_FUNCTION_MULTIARCH (ipsec_if_input_node, ipsec_if_input_node_fn)
152 * fd.io coding-style-patch-verification: ON
155 * eval: (c-set-style "gnu")