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
36 #define _(sym,str) IPSEC_IF_INPUT_ERROR_##sym,
37 foreach_ipsec_if_input_error
39 IPSEC_IF_INPUT_N_ERROR,
40 } ipsec_if_input_error_t;
43 IPSEC_IF_INPUT_NEXT_ESP_DECRYPT,
44 IPSEC_IF_INPUT_NEXT_DROP,
45 IPSEC_IF_INPUT_N_NEXT,
46 } ipsec_if_input_next_t;
51 } ipsec_if_input_trace_t;
54 u8 * format_ipsec_if_input_trace (u8 * s, va_list * args)
56 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
57 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
58 ipsec_if_input_trace_t * t
59 = va_arg (*args, ipsec_if_input_trace_t *);
61 s = format (s, "IPSec: spi %u seq %u", t->spi, t->seq);
66 ipsec_if_input_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
67 vlib_frame_t * from_frame)
69 ipsec_main_t *im = &ipsec_main;
70 u32 * from, * to_next = 0, next_index;
73 from = vlib_frame_vector_args (from_frame);
74 n_left_from = from_frame->n_vectors;
75 next_index = node->cached_next_index;
77 while (n_left_from > 0)
81 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
83 while (n_left_from > 0 && n_left_to_next > 0)
91 bi0 = to_next[0] = from[0];
96 b0 = vlib_get_buffer (vm, bi0);
97 ip0 = vlib_buffer_get_current (b0);
98 esp0 = (esp_header_t *) ((u8 *) ip0 + ip4_header_bytes (ip0));
100 next0 = IPSEC_IF_INPUT_NEXT_DROP;
102 u64 key = (u64) ip0->src_address.as_u32 << 32 |
103 (u64) clib_net_to_host_u32(esp0->spi);
105 p = hash_get (im->ipsec_if_pool_index_by_key, key);
109 ipsec_tunnel_if_t * t;
110 t = pool_elt_at_index(im->tunnel_interfaces, p[0]);
111 vnet_buffer(b0)->output_features.ipsec_sad_index = t->input_sa_index;
112 vlib_buffer_advance(b0, ip4_header_bytes (ip0));
113 next0 = IPSEC_IF_INPUT_NEXT_ESP_DECRYPT;
116 if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED)) {
117 ipsec_if_input_trace_t *tr = 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;
135 VLIB_REGISTER_NODE (ipsec_if_input_node) = {
136 .function = ipsec_if_input_node_fn,
137 .name = "ipsec-if-input",
138 .vector_size = sizeof (u32),
139 .format_trace = format_ipsec_if_input_trace,
140 .type = VLIB_NODE_TYPE_INTERNAL,
142 .n_errors = ARRAY_LEN(ipsec_if_input_error_strings),
143 .error_strings = ipsec_if_input_error_strings,
145 .n_next_nodes = IPSEC_IF_INPUT_N_NEXT,
148 [IPSEC_IF_INPUT_NEXT_ESP_DECRYPT] = "esp-decrypt",
149 [IPSEC_IF_INPUT_NEXT_DROP] = "error-drop",