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Ed Warnickecb9cada2015-12-08 15:45:58 -07001/*
2 * ipsec_if_in.c : IPSec interface input node
3 *
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:
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
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.
16 */
17
18#include <vnet/vnet.h>
19#include <vnet/api_errno.h>
20#include <vnet/ip/ip.h>
21
22#include <vnet/ipsec/ipsec.h>
23#include <vnet/ipsec/esp.h>
24
25/* Statistics (not really errors) */
Matthew Smith831fd642018-05-15 22:03:05 -050026#define foreach_ipsec_if_input_error \
27_(RX, "good packets received") \
28_(DISABLED, "ipsec packets received on disabled interface")
Ed Warnickecb9cada2015-12-08 15:45:58 -070029
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -070030static char *ipsec_if_input_error_strings[] = {
Ed Warnickecb9cada2015-12-08 15:45:58 -070031#define _(sym,string) string,
32 foreach_ipsec_if_input_error
33#undef _
34};
35
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -070036typedef enum
37{
Ed Warnickecb9cada2015-12-08 15:45:58 -070038#define _(sym,str) IPSEC_IF_INPUT_ERROR_##sym,
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -070039 foreach_ipsec_if_input_error
Ed Warnickecb9cada2015-12-08 15:45:58 -070040#undef _
41 IPSEC_IF_INPUT_N_ERROR,
42} ipsec_if_input_error_t;
43
Ed Warnickecb9cada2015-12-08 15:45:58 -070044
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -070045typedef struct
46{
Ed Warnickecb9cada2015-12-08 15:45:58 -070047 u32 spi;
48 u32 seq;
49} ipsec_if_input_trace_t;
50
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -070051u8 *
52format_ipsec_if_input_trace (u8 * s, va_list * args)
Ed Warnickecb9cada2015-12-08 15:45:58 -070053{
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 *);
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -070056 ipsec_if_input_trace_t *t = va_arg (*args, ipsec_if_input_trace_t *);
Ed Warnickecb9cada2015-12-08 15:45:58 -070057
58 s = format (s, "IPSec: spi %u seq %u", t->spi, t->seq);
59 return s;
60}
61
Klement Sekerab8f35442018-10-29 13:38:19 +010062VLIB_NODE_FN (ipsec_if_input_node) (vlib_main_t * vm,
63 vlib_node_runtime_t * node,
64 vlib_frame_t * from_frame)
Ed Warnickecb9cada2015-12-08 15:45:58 -070065{
66 ipsec_main_t *im = &ipsec_main;
Matthew Smith01034be2017-05-16 11:51:18 -050067 vnet_main_t *vnm = im->vnet_main;
68 vnet_interface_main_t *vim = &vnm->interface_main;
“mukeshyadav1984”430ac932017-11-23 02:39:33 -080069 ipsec_proto_main_t *em = &ipsec_proto_main;
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -070070 u32 *from, *to_next = 0, next_index;
Matthew Smith01034be2017-05-16 11:51:18 -050071 u32 n_left_from, last_sw_if_index = ~0;
Damjan Marion067cd622018-07-11 12:47:43 +020072 u32 thread_index = vm->thread_index;
Matthew Smith01034be2017-05-16 11:51:18 -050073 u64 n_bytes = 0, n_packets = 0;
74 u8 icv_len;
75 ipsec_tunnel_if_t *last_t = NULL;
76 ipsec_sa_t *sa0;
Matthew Smith831fd642018-05-15 22:03:05 -050077 vlib_combined_counter_main_t *rx_counter;
78 vlib_combined_counter_main_t *drop_counter;
79 u32 n_disabled = 0;
80
81 rx_counter = vim->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX;
82 drop_counter = vim->combined_sw_if_counters + VNET_INTERFACE_COUNTER_DROP;
Ed Warnickecb9cada2015-12-08 15:45:58 -070083
84 from = vlib_frame_vector_args (from_frame);
85 n_left_from = from_frame->n_vectors;
86 next_index = node->cached_next_index;
87
88 while (n_left_from > 0)
89 {
90 u32 n_left_to_next;
91
92 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
93
94 while (n_left_from > 0 && n_left_to_next > 0)
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -070095 {
Matthew Smith01034be2017-05-16 11:51:18 -050096 u32 bi0, next0, sw_if_index0;
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -070097 vlib_buffer_t *b0;
98 ip4_header_t *ip0;
99 esp_header_t *esp0;
100 uword *p;
Matthew Smith831fd642018-05-15 22:03:05 -0500101 u32 len0;
Ed Warnickecb9cada2015-12-08 15:45:58 -0700102
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -0700103 bi0 = to_next[0] = from[0];
104 from += 1;
105 n_left_from -= 1;
106 to_next += 1;
107 n_left_to_next -= 1;
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));
Ed Warnickecb9cada2015-12-08 15:45:58 -0700111
Sergio Gonzalez Monroyd04b60b2017-01-20 15:35:23 +0000112 next0 = IPSEC_INPUT_NEXT_DROP;
Ed Warnickecb9cada2015-12-08 15:45:58 -0700113
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -0700114 u64 key = (u64) ip0->src_address.as_u32 << 32 |
115 (u64) clib_net_to_host_u32 (esp0->spi);
Ed Warnickecb9cada2015-12-08 15:45:58 -0700116
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -0700117 p = hash_get (im->ipsec_if_pool_index_by_key, key);
Ed Warnickecb9cada2015-12-08 15:45:58 -0700118
Matthew Smith831fd642018-05-15 22:03:05 -0500119 len0 = vlib_buffer_length_in_chain (vm, b0);
120
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -0700121 if (p)
122 {
123 ipsec_tunnel_if_t *t;
124 t = pool_elt_at_index (im->tunnel_interfaces, p[0]);
Damjan Marion9c6ae5f2016-11-15 23:20:01 +0100125 vnet_buffer (b0)->ipsec.sad_index = t->input_sa_index;
Matthew Smith01034be2017-05-16 11:51:18 -0500126 if (t->hw_if_index != ~0)
127 {
128 vnet_hw_interface_t *hi;
129
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;
Matthew Smith02e14b52017-09-14 09:05:35 -0500133 vnet_buffer (b0)->sw_if_index[VLIB_RX] = sw_if_index0;
Matthew Smith01034be2017-05-16 11:51:18 -0500134
Matthew Smith831fd642018-05-15 22:03:05 -0500135 if (PREDICT_FALSE
136 (!(hi->flags & VNET_HW_INTERFACE_FLAG_LINK_UP)))
137 {
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];
141 n_disabled++;
142 goto trace;
143 }
144
Matthew Smith01034be2017-05-16 11:51:18 -0500145 if (PREDICT_TRUE (sw_if_index0 == last_sw_if_index))
146 {
147 n_packets++;
Matthew Smith831fd642018-05-15 22:03:05 -0500148 n_bytes += len0;
Matthew Smith01034be2017-05-16 11:51:18 -0500149 }
150 else
151 {
152 sa0 = pool_elt_at_index (im->sad, t->input_sa_index);
“mukeshyadav1984”430ac932017-11-23 02:39:33 -0800153 icv_len =
154 em->ipsec_proto_main_integ_algs[sa0->
155 integ_alg].trunc_size;
Matthew Smith01034be2017-05-16 11:51:18 -0500156
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);
162
163 if (last_t)
164 {
165 vlib_increment_combined_counter
Matthew Smith831fd642018-05-15 22:03:05 -0500166 (rx_counter, thread_index, sw_if_index0,
167 n_packets, n_bytes);
Matthew Smith01034be2017-05-16 11:51:18 -0500168 }
169
170 last_sw_if_index = sw_if_index0;
171 last_t = t;
172 n_packets = 1;
Matthew Smith831fd642018-05-15 22:03:05 -0500173 n_bytes = len0;
Matthew Smith01034be2017-05-16 11:51:18 -0500174 }
175 }
176 else
177 {
178 vnet_buffer (b0)->ipsec.flags = IPSEC_FLAG_IPSEC_GRE_TUNNEL;
179 }
180
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -0700181 vlib_buffer_advance (b0, ip4_header_bytes (ip0));
Klement Sekerabe5a5dd2018-10-09 16:05:48 +0200182 next0 = im->esp4_decrypt_next_index;
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -0700183 }
Ed Warnickecb9cada2015-12-08 15:45:58 -0700184
Matthew Smith831fd642018-05-15 22:03:05 -0500185 trace:
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -0700186 if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
187 {
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);
192 }
Ed Warnickecb9cada2015-12-08 15:45:58 -0700193
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -0700194 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
195 n_left_to_next, bi0, next0);
196 }
Ed Warnickecb9cada2015-12-08 15:45:58 -0700197 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
198 }
199
Matthew Smith01034be2017-05-16 11:51:18 -0500200 if (last_t)
201 {
202 sa0 = pool_elt_at_index (im->sad, last_t->input_sa_index);
“mukeshyadav1984”430ac932017-11-23 02:39:33 -0800203 icv_len = em->ipsec_proto_main_integ_algs[sa0->integ_alg].trunc_size;
Matthew Smith01034be2017-05-16 11:51:18 -0500204
205 n_bytes -= n_packets * (sizeof (ip4_header_t) + sizeof (esp_header_t) +
206 sizeof (esp_footer_t) + 16 /* aes-cbc IV */ +
207 icv_len);
Matthew Smith831fd642018-05-15 22:03:05 -0500208 vlib_increment_combined_counter (rx_counter,
Matthew Smith01034be2017-05-16 11:51:18 -0500209 thread_index,
210 last_sw_if_index, n_packets, n_bytes);
211 }
212
Ed Warnickecb9cada2015-12-08 15:45:58 -0700213 vlib_node_increment_counter (vm, ipsec_if_input_node.index,
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -0700214 IPSEC_IF_INPUT_ERROR_RX,
Matthew Smith831fd642018-05-15 22:03:05 -0500215 from_frame->n_vectors - n_disabled);
216
217 vlib_node_increment_counter (vm, ipsec_if_input_node.index,
218 IPSEC_IF_INPUT_ERROR_DISABLED, n_disabled);
Ed Warnickecb9cada2015-12-08 15:45:58 -0700219
220 return from_frame->n_vectors;
221}
222
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -0700223/* *INDENT-OFF* */
Ed Warnickecb9cada2015-12-08 15:45:58 -0700224VLIB_REGISTER_NODE (ipsec_if_input_node) = {
Ed Warnickecb9cada2015-12-08 15:45:58 -0700225 .name = "ipsec-if-input",
226 .vector_size = sizeof (u32),
227 .format_trace = format_ipsec_if_input_trace,
228 .type = VLIB_NODE_TYPE_INTERNAL,
229
230 .n_errors = ARRAY_LEN(ipsec_if_input_error_strings),
231 .error_strings = ipsec_if_input_error_strings,
232
Klement Sekerabe5a5dd2018-10-09 16:05:48 +0200233 .sibling_of = "ipsec4-input",
Damjan Marion1c80e832016-05-11 23:07:18 +0200234};
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -0700235/* *INDENT-ON* */
Damjan Marion1c80e832016-05-11 23:07:18 +0200236
Keith Burns (alagalah)166a9d42016-08-06 11:00:56 -0700237/*
238 * fd.io coding-style-patch-verification: ON
239 *
240 * Local Variables:
241 * eval: (c-set-style "gnu")
242 * End:
243 */