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 vnet_main_t *vnm = im->vnet_main;
67 vnet_interface_main_t *vim = &vnm->interface_main;
68 esp_main_t *em = &esp_main;
69 u32 *from, *to_next = 0, next_index;
70 u32 n_left_from, last_sw_if_index = ~0;
71 u32 thread_index = vlib_get_thread_index ();
72 u64 n_bytes = 0, n_packets = 0;
74 ipsec_tunnel_if_t *last_t = NULL;
77 from = vlib_frame_vector_args (from_frame);
78 n_left_from = from_frame->n_vectors;
79 next_index = node->cached_next_index;
81 while (n_left_from > 0)
85 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
87 while (n_left_from > 0 && n_left_to_next > 0)
89 u32 bi0, next0, sw_if_index0;
95 bi0 = to_next[0] = from[0];
100 b0 = vlib_get_buffer (vm, bi0);
101 ip0 = vlib_buffer_get_current (b0);
102 esp0 = (esp_header_t *) ((u8 *) ip0 + ip4_header_bytes (ip0));
104 next0 = IPSEC_INPUT_NEXT_DROP;
106 u64 key = (u64) ip0->src_address.as_u32 << 32 |
107 (u64) clib_net_to_host_u32 (esp0->spi);
109 p = hash_get (im->ipsec_if_pool_index_by_key, key);
113 ipsec_tunnel_if_t *t;
114 t = pool_elt_at_index (im->tunnel_interfaces, p[0]);
115 vnet_buffer (b0)->ipsec.sad_index = t->input_sa_index;
116 if (t->hw_if_index != ~0)
118 vnet_hw_interface_t *hi;
120 vnet_buffer (b0)->ipsec.flags = 0;
121 hi = vnet_get_hw_interface (vnm, t->hw_if_index);
122 sw_if_index0 = hi->sw_if_index;
123 vnet_buffer (b0)->sw_if_index[VLIB_RX] = sw_if_index0;
125 if (PREDICT_TRUE (sw_if_index0 == last_sw_if_index))
128 n_bytes += vlib_buffer_length_in_chain (vm, b0);
132 sa0 = pool_elt_at_index (im->sad, t->input_sa_index);
133 icv_len = em->esp_integ_algs[sa0->integ_alg].trunc_size;
135 /* length = packet length - ESP/tunnel overhead */
136 n_bytes -= n_packets * (sizeof (ip4_header_t) +
137 sizeof (esp_header_t) +
138 sizeof (esp_footer_t) +
139 16 /* aes-cbc IV */ + icv_len);
143 vlib_increment_combined_counter
144 (vim->combined_sw_if_counters
145 + VNET_INTERFACE_COUNTER_RX,
146 thread_index, sw_if_index0, n_packets, n_bytes);
149 last_sw_if_index = sw_if_index0;
152 n_bytes = vlib_buffer_length_in_chain (vm, b0);
157 vnet_buffer (b0)->ipsec.flags = IPSEC_FLAG_IPSEC_GRE_TUNNEL;
160 vlib_buffer_advance (b0, ip4_header_bytes (ip0));
161 next0 = im->esp_decrypt_next_index;
164 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
166 ipsec_if_input_trace_t *tr =
167 vlib_add_trace (vm, node, b0, sizeof (*tr));
168 tr->spi = clib_host_to_net_u32 (esp0->spi);
169 tr->seq = clib_host_to_net_u32 (esp0->seq);
172 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
173 n_left_to_next, bi0, next0);
175 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
180 sa0 = pool_elt_at_index (im->sad, last_t->input_sa_index);
181 icv_len = em->esp_integ_algs[sa0->integ_alg].trunc_size;
183 n_bytes -= n_packets * (sizeof (ip4_header_t) + sizeof (esp_header_t) +
184 sizeof (esp_footer_t) + 16 /* aes-cbc IV */ +
186 vlib_increment_combined_counter (vim->combined_sw_if_counters
187 + VNET_INTERFACE_COUNTER_RX,
189 last_sw_if_index, n_packets, n_bytes);
192 vlib_node_increment_counter (vm, ipsec_if_input_node.index,
193 IPSEC_IF_INPUT_ERROR_RX,
194 from_frame->n_vectors);
196 return from_frame->n_vectors;
200 VLIB_REGISTER_NODE (ipsec_if_input_node) = {
201 .function = ipsec_if_input_node_fn,
202 .name = "ipsec-if-input",
203 .vector_size = sizeof (u32),
204 .format_trace = format_ipsec_if_input_trace,
205 .type = VLIB_NODE_TYPE_INTERNAL,
207 .n_errors = ARRAY_LEN(ipsec_if_input_error_strings),
208 .error_strings = ipsec_if_input_error_strings,
210 .sibling_of = "ipsec-input-ip4",
214 VLIB_NODE_FUNCTION_MULTIARCH (ipsec_if_input_node, ipsec_if_input_node_fn)
216 * fd.io coding-style-patch-verification: ON
219 * eval: (c-set-style "gnu")