2 * ipsec.c : IPSEC module functions
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>
21 #include <vnet/interface.h>
22 #include <vnet/udp/udp.h>
24 #include <vnet/ipsec/ipsec.h>
25 #include <vnet/ipsec/esp.h>
26 #include <vnet/ipsec/ah.h>
28 ipsec_main_t ipsec_main;
31 ipsec_rand_seed (void)
40 seed_data.time = time (NULL);
41 seed_data.pid = getpid ();
42 seed_data.p = (void *) &seed_data;
44 RAND_seed ((const void *) &seed_data, sizeof (seed_data));
48 ipsec_check_ah_support (ipsec_sa_t * sa)
50 if (sa->integ_alg == IPSEC_INTEG_ALG_NONE)
51 return clib_error_return (0, "unsupported none integ-alg");
56 ipsec_check_esp_support (ipsec_sa_t * sa)
58 if (sa->crypto_alg == IPSEC_CRYPTO_ALG_AES_GCM_128)
59 return clib_error_return (0, "unsupported aes-gcm-128 crypto-alg");
60 if (sa->crypto_alg == IPSEC_CRYPTO_ALG_AES_GCM_192)
61 return clib_error_return (0, "unsupported aes-gcm-192 crypto-alg");
62 if (sa->crypto_alg == IPSEC_CRYPTO_ALG_AES_GCM_256)
63 return clib_error_return (0, "unsupported aes-gcm-256 crypto-alg");
69 ipsec_add_del_sa_sess_cb (ipsec_main_t * im, u32 sa_index, u8 is_add)
71 ipsec_ah_backend_t *ah =
72 pool_elt_at_index (im->ah_backends, im->ah_current_backend);
73 if (ah->add_del_sa_sess_cb)
75 clib_error_t *err = ah->add_del_sa_sess_cb (sa_index, is_add);
79 ipsec_esp_backend_t *esp =
80 pool_elt_at_index (im->esp_backends, im->esp_current_backend);
81 if (esp->add_del_sa_sess_cb)
83 clib_error_t *err = esp->add_del_sa_sess_cb (sa_index, is_add);
91 ipsec_check_support_cb (ipsec_main_t * im, ipsec_sa_t * sa)
93 clib_error_t *error = 0;
95 if (PREDICT_FALSE (sa->protocol == IPSEC_PROTOCOL_AH))
97 ipsec_ah_backend_t *ah =
98 pool_elt_at_index (im->ah_backends, im->ah_current_backend);
99 ASSERT (ah->check_support_cb);
100 error = ah->check_support_cb (sa);
104 ipsec_esp_backend_t *esp =
105 pool_elt_at_index (im->esp_backends, im->esp_current_backend);
106 ASSERT (esp->check_support_cb);
107 error = esp->check_support_cb (sa);
114 ipsec_add_node (vlib_main_t * vm, const char *node_name,
115 const char *prev_node_name, u32 * out_node_index,
116 u32 * out_next_index)
118 vlib_node_t *prev_node, *node;
119 prev_node = vlib_get_node_by_name (vm, (u8 *) prev_node_name);
121 node = vlib_get_node_by_name (vm, (u8 *) node_name);
123 *out_node_index = node->index;
124 *out_next_index = vlib_node_add_next (vm, prev_node->index, node->index);
128 ipsec_register_ah_backend (vlib_main_t * vm, ipsec_main_t * im,
130 const char *ah4_encrypt_node_name,
131 const char *ah4_decrypt_node_name,
132 const char *ah6_encrypt_node_name,
133 const char *ah6_decrypt_node_name,
134 check_support_cb_t ah_check_support_cb,
135 add_del_sa_sess_cb_t ah_add_del_sa_sess_cb)
137 ipsec_ah_backend_t *b;
138 pool_get (im->ah_backends, b);
139 b->name = format (NULL, "%s", name);
141 ipsec_add_node (vm, ah4_encrypt_node_name, "ipsec4-output-feature",
142 &b->ah4_encrypt_node_index, &b->ah4_encrypt_next_index);
143 ipsec_add_node (vm, ah4_decrypt_node_name, "ipsec4-input-feature",
144 &b->ah4_decrypt_node_index, &b->ah4_decrypt_next_index);
145 ipsec_add_node (vm, ah6_encrypt_node_name, "ipsec6-output-feature",
146 &b->ah6_encrypt_node_index, &b->ah6_encrypt_next_index);
147 ipsec_add_node (vm, ah6_decrypt_node_name, "ipsec6-input-feature",
148 &b->ah6_decrypt_node_index, &b->ah6_decrypt_next_index);
150 b->check_support_cb = ah_check_support_cb;
151 b->add_del_sa_sess_cb = ah_add_del_sa_sess_cb;
152 return b - im->ah_backends;
156 ipsec_register_esp_backend (vlib_main_t * vm, ipsec_main_t * im,
158 const char *esp4_encrypt_node_name,
159 const char *esp4_decrypt_node_name,
160 const char *esp6_encrypt_node_name,
161 const char *esp6_decrypt_node_name,
162 check_support_cb_t esp_check_support_cb,
163 add_del_sa_sess_cb_t esp_add_del_sa_sess_cb)
165 ipsec_esp_backend_t *b;
166 pool_get (im->esp_backends, b);
167 b->name = format (NULL, "%s", name);
169 ipsec_add_node (vm, esp4_encrypt_node_name, "ipsec4-output-feature",
170 &b->esp4_encrypt_node_index, &b->esp4_encrypt_next_index);
171 ipsec_add_node (vm, esp4_decrypt_node_name, "ipsec4-input-feature",
172 &b->esp4_decrypt_node_index, &b->esp4_decrypt_next_index);
173 ipsec_add_node (vm, esp6_encrypt_node_name, "ipsec6-output-feature",
174 &b->esp6_encrypt_node_index, &b->esp6_encrypt_next_index);
175 ipsec_add_node (vm, esp6_decrypt_node_name, "ipsec6-input-feature",
176 &b->esp6_decrypt_node_index, &b->esp6_decrypt_next_index);
178 b->check_support_cb = esp_check_support_cb;
179 b->add_del_sa_sess_cb = esp_add_del_sa_sess_cb;
180 return b - im->esp_backends;
184 ipsec_sa_restack (ipsec_sa_t * sa, void *ctx)
188 return (WALK_CONTINUE);
192 ipsec_select_ah_backend (ipsec_main_t * im, u32 backend_idx)
194 if (pool_elts (im->sad) > 0
195 || pool_is_free_index (im->ah_backends, backend_idx))
199 ipsec_ah_backend_t *b = pool_elt_at_index (im->ah_backends, backend_idx);
200 im->ah_current_backend = backend_idx;
201 im->ah4_encrypt_node_index = b->ah4_encrypt_node_index;
202 im->ah4_decrypt_node_index = b->ah4_decrypt_node_index;
203 im->ah4_encrypt_next_index = b->ah4_encrypt_next_index;
204 im->ah4_decrypt_next_index = b->ah4_decrypt_next_index;
205 im->ah6_encrypt_node_index = b->ah6_encrypt_node_index;
206 im->ah6_decrypt_node_index = b->ah6_decrypt_node_index;
207 im->ah6_encrypt_next_index = b->ah6_encrypt_next_index;
208 im->ah6_decrypt_next_index = b->ah6_decrypt_next_index;
210 ipsec_sa_walk (ipsec_sa_restack, NULL);
215 ipsec_select_esp_backend (ipsec_main_t * im, u32 backend_idx)
217 if (pool_elts (im->sad) > 0
218 || pool_is_free_index (im->esp_backends, backend_idx))
222 ipsec_esp_backend_t *b = pool_elt_at_index (im->esp_backends, backend_idx);
223 im->esp_current_backend = backend_idx;
224 im->esp4_encrypt_node_index = b->esp4_encrypt_node_index;
225 im->esp4_decrypt_node_index = b->esp4_decrypt_node_index;
226 im->esp4_encrypt_next_index = b->esp4_encrypt_next_index;
227 im->esp4_decrypt_next_index = b->esp4_decrypt_next_index;
228 im->esp6_encrypt_node_index = b->esp6_encrypt_node_index;
229 im->esp6_decrypt_node_index = b->esp6_decrypt_node_index;
230 im->esp6_encrypt_next_index = b->esp6_encrypt_next_index;
231 im->esp6_decrypt_next_index = b->esp6_decrypt_next_index;
233 ipsec_sa_walk (ipsec_sa_restack, NULL);
237 static clib_error_t *
238 ipsec_init (vlib_main_t * vm)
241 ipsec_main_t *im = &ipsec_main;
242 vlib_thread_main_t *tm = vlib_get_thread_main ();
246 clib_memset (im, 0, sizeof (im[0]));
248 im->vnet_main = vnet_get_main ();
251 im->spd_index_by_spd_id = hash_create (0, sizeof (uword));
252 im->sa_index_by_sa_id = hash_create (0, sizeof (uword));
253 im->spd_index_by_sw_if_index = hash_create (0, sizeof (uword));
255 vec_validate_aligned (im->empty_buffers, tm->n_vlib_mains - 1,
256 CLIB_CACHE_LINE_BYTES);
258 vlib_node_t *node = vlib_get_node_by_name (vm, (u8 *) "error-drop");
260 im->error_drop_node_index = node->index;
262 u32 idx = ipsec_register_ah_backend (vm, im, "default openssl backend",
267 ipsec_check_ah_support,
270 im->ah_default_backend = idx;
271 int rv = ipsec_select_ah_backend (im, idx);
273 (void) (rv); // avoid warning
275 idx = ipsec_register_esp_backend (vm, im, "default openssl backend",
280 ipsec_check_esp_support, NULL);
281 im->esp_default_backend = idx;
283 rv = ipsec_select_esp_backend (im, idx);
285 (void) (rv); // avoid warning
287 if ((error = vlib_call_init_function (vm, ipsec_cli_init)))
290 if ((error = vlib_call_init_function (vm, ipsec_tunnel_if_init)))
298 VLIB_INIT_FUNCTION (ipsec_init);
301 * fd.io coding-style-patch-verification: ON
304 * eval: (c-set-style "gnu")