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") \
28 _(DISABLED, "ipsec packets received on disabled interface")
30 static char *ipsec_if_input_error_strings[] = {
31 #define _(sym,string) string,
32 foreach_ipsec_if_input_error
38 #define _(sym,str) IPSEC_IF_INPUT_ERROR_##sym,
39 foreach_ipsec_if_input_error
41 IPSEC_IF_INPUT_N_ERROR,
42 } ipsec_if_input_error_t;
49 } ipsec_if_input_trace_t;
52 format_ipsec_if_input_trace (u8 * s, va_list * args)
54 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
55 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
56 ipsec_if_input_trace_t *t = va_arg (*args, ipsec_if_input_trace_t *);
58 s = format (s, "IPSec: spi %u seq %u", t->spi, t->seq);
63 ipsec_if_input_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
64 vlib_frame_t * from_frame)
66 ipsec_main_t *im = &ipsec_main;
67 vnet_main_t *vnm = im->vnet_main;
68 vnet_interface_main_t *vim = &vnm->interface_main;
69 ipsec_proto_main_t *em = &ipsec_proto_main;
70 u32 *from, *to_next = 0, next_index;
71 u32 n_left_from, last_sw_if_index = ~0;
72 u32 thread_index = vlib_get_thread_index ();
73 u64 n_bytes = 0, n_packets = 0;
75 ipsec_tunnel_if_t *last_t = NULL;
77 vlib_combined_counter_main_t *rx_counter;
78 vlib_combined_counter_main_t *drop_counter;
81 rx_counter = vim->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX;
82 drop_counter = vim->combined_sw_if_counters + VNET_INTERFACE_COUNTER_DROP;
84 from = vlib_frame_vector_args (from_frame);
85 n_left_from = from_frame->n_vectors;
86 next_index = node->cached_next_index;
88 while (n_left_from > 0)
92 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
94 while (n_left_from > 0 && n_left_to_next > 0)
96 u32 bi0, next0, sw_if_index0;
103 bi0 = to_next[0] = from[0];
108 b0 = vlib_get_buffer (vm, bi0);
109 ip0 = vlib_buffer_get_current (b0);
110 esp0 = (esp_header_t *) ((u8 *) ip0 + ip4_header_bytes (ip0));
112 next0 = IPSEC_INPUT_NEXT_DROP;
114 u64 key = (u64) ip0->src_address.as_u32 << 32 |
115 (u64) clib_net_to_host_u32 (esp0->spi);
117 p = hash_get (im->ipsec_if_pool_index_by_key, key);
119 len0 = vlib_buffer_length_in_chain (vm, b0);
123 ipsec_tunnel_if_t *t;
124 t = pool_elt_at_index (im->tunnel_interfaces, p[0]);
125 vnet_buffer (b0)->ipsec.sad_index = t->input_sa_index;
126 if (t->hw_if_index != ~0)
128 vnet_hw_interface_t *hi;
130 vnet_buffer (b0)->ipsec.flags = 0;
131 hi = vnet_get_hw_interface (vnm, t->hw_if_index);
132 sw_if_index0 = hi->sw_if_index;
133 vnet_buffer (b0)->sw_if_index[VLIB_RX] = sw_if_index0;
136 (!(hi->flags & VNET_HW_INTERFACE_FLAG_LINK_UP)))
138 vlib_increment_combined_counter
139 (drop_counter, thread_index, sw_if_index0, 1, len0);
140 b0->error = node->errors[IPSEC_IF_INPUT_ERROR_DISABLED];
145 if (PREDICT_TRUE (sw_if_index0 == last_sw_if_index))
152 sa0 = pool_elt_at_index (im->sad, t->input_sa_index);
154 em->ipsec_proto_main_integ_algs[sa0->
155 integ_alg].trunc_size;
157 /* length = packet length - ESP/tunnel overhead */
158 n_bytes -= n_packets * (sizeof (ip4_header_t) +
159 sizeof (esp_header_t) +
160 sizeof (esp_footer_t) +
161 16 /* aes-cbc IV */ + icv_len);
165 vlib_increment_combined_counter
166 (rx_counter, thread_index, sw_if_index0,
170 last_sw_if_index = sw_if_index0;
178 vnet_buffer (b0)->ipsec.flags = IPSEC_FLAG_IPSEC_GRE_TUNNEL;
181 vlib_buffer_advance (b0, ip4_header_bytes (ip0));
182 next0 = im->esp_decrypt_next_index;
186 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
188 ipsec_if_input_trace_t *tr =
189 vlib_add_trace (vm, node, b0, sizeof (*tr));
190 tr->spi = clib_host_to_net_u32 (esp0->spi);
191 tr->seq = clib_host_to_net_u32 (esp0->seq);
194 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
195 n_left_to_next, bi0, next0);
197 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
202 sa0 = pool_elt_at_index (im->sad, last_t->input_sa_index);
203 icv_len = em->ipsec_proto_main_integ_algs[sa0->integ_alg].trunc_size;
205 n_bytes -= n_packets * (sizeof (ip4_header_t) + sizeof (esp_header_t) +
206 sizeof (esp_footer_t) + 16 /* aes-cbc IV */ +
208 vlib_increment_combined_counter (rx_counter,
210 last_sw_if_index, n_packets, n_bytes);
213 vlib_node_increment_counter (vm, ipsec_if_input_node.index,
214 IPSEC_IF_INPUT_ERROR_RX,
215 from_frame->n_vectors - n_disabled);
217 vlib_node_increment_counter (vm, ipsec_if_input_node.index,
218 IPSEC_IF_INPUT_ERROR_DISABLED, n_disabled);
220 return from_frame->n_vectors;
224 VLIB_REGISTER_NODE (ipsec_if_input_node) = {
225 .function = ipsec_if_input_node_fn,
226 .name = "ipsec-if-input",
227 .vector_size = sizeof (u32),
228 .format_trace = format_ipsec_if_input_trace,
229 .type = VLIB_NODE_TYPE_INTERNAL,
231 .n_errors = ARRAY_LEN(ipsec_if_input_error_strings),
232 .error_strings = ipsec_if_input_error_strings,
234 .sibling_of = "ipsec-input-ip4",
238 VLIB_NODE_FUNCTION_MULTIARCH (ipsec_if_input_node, ipsec_if_input_node_fn)
240 * fd.io coding-style-patch-verification: ON
243 * eval: (c-set-style "gnu")