2 * Copyright (c) 2015 Cisco and/or its affiliates.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
16 #include <vnet/ipsec/ipsec.h>
17 #include <vnet/ipsec/esp.h>
18 #include <vnet/udp/udp_local.h>
19 #include <vnet/fib/fib_table.h>
20 #include <vnet/fib/fib_entry_track.h>
21 #include <vnet/ipsec/ipsec_tun.h>
25 * SA packet & bytes counters
27 vlib_combined_counter_main_t ipsec_sa_counters = {
29 .stat_segment_name = "/net/ipsec/sa",
31 vlib_simple_counter_main_t ipsec_sa_lost_counters = {
33 .stat_segment_name = "/net/ipsec/sa/lost",
36 ipsec_sa_t *ipsec_sa_pool;
39 ipsec_call_add_del_callbacks (ipsec_main_t * im, ipsec_sa_t * sa,
40 u32 sa_index, int is_add)
42 ipsec_ah_backend_t *ab;
43 ipsec_esp_backend_t *eb;
46 case IPSEC_PROTOCOL_AH:
47 ab = pool_elt_at_index (im->ah_backends, im->ah_current_backend);
48 if (ab->add_del_sa_sess_cb)
49 return ab->add_del_sa_sess_cb (sa_index, is_add);
51 case IPSEC_PROTOCOL_ESP:
52 eb = pool_elt_at_index (im->esp_backends, im->esp_current_backend);
53 if (eb->add_del_sa_sess_cb)
54 return eb->add_del_sa_sess_cb (sa_index, is_add);
61 ipsec_mk_key (ipsec_key_t * key, const u8 * data, u8 len)
63 memset (key, 0, sizeof (*key));
65 if (len > sizeof (key->data))
66 key->len = sizeof (key->data);
70 memcpy (key->data, data, key->len);
74 * 'stack' (resolve the recursion for) the SA tunnel destination
77 ipsec_sa_stack (ipsec_sa_t * sa)
79 ipsec_main_t *im = &ipsec_main;
80 dpo_id_t tmp = DPO_INVALID;
82 tunnel_contribute_forwarding (&sa->tunnel, &tmp);
84 if (IPSEC_PROTOCOL_AH == sa->protocol)
85 dpo_stack_from_node ((ipsec_sa_is_set_IS_TUNNEL_V6 (sa) ?
86 im->ah6_encrypt_node_index :
87 im->ah4_encrypt_node_index), &sa->dpo, &tmp);
89 dpo_stack_from_node ((ipsec_sa_is_set_IS_TUNNEL_V6 (sa) ?
90 im->esp6_encrypt_node_index :
91 im->esp4_encrypt_node_index), &sa->dpo, &tmp);
96 ipsec_sa_set_crypto_alg (ipsec_sa_t * sa, ipsec_crypto_alg_t crypto_alg)
98 ipsec_main_t *im = &ipsec_main;
99 sa->crypto_alg = crypto_alg;
100 sa->crypto_iv_size = im->crypto_algs[crypto_alg].iv_size;
101 sa->esp_block_align = clib_max (4, im->crypto_algs[crypto_alg].block_align);
102 sa->sync_op_data.crypto_enc_op_id = im->crypto_algs[crypto_alg].enc_op_id;
103 sa->sync_op_data.crypto_dec_op_id = im->crypto_algs[crypto_alg].dec_op_id;
104 sa->crypto_calg = im->crypto_algs[crypto_alg].alg;
105 ASSERT (sa->crypto_iv_size <= ESP_MAX_IV_SIZE);
106 ASSERT (sa->esp_block_align <= ESP_MAX_BLOCK_SIZE);
107 if (IPSEC_CRYPTO_ALG_IS_GCM (crypto_alg) ||
108 IPSEC_CRYPTO_ALG_CTR_AEAD_OTHERS (crypto_alg))
110 sa->integ_icv_size = im->crypto_algs[crypto_alg].icv_size;
111 ipsec_sa_set_IS_CTR (sa);
112 ipsec_sa_set_IS_AEAD (sa);
114 else if (IPSEC_CRYPTO_ALG_IS_CTR (crypto_alg))
116 ipsec_sa_set_IS_CTR (sa);
121 ipsec_sa_set_integ_alg (ipsec_sa_t * sa, ipsec_integ_alg_t integ_alg)
123 ipsec_main_t *im = &ipsec_main;
124 sa->integ_alg = integ_alg;
125 sa->integ_icv_size = im->integ_algs[integ_alg].icv_size;
126 sa->sync_op_data.integ_op_id = im->integ_algs[integ_alg].op_id;
127 sa->integ_calg = im->integ_algs[integ_alg].alg;
128 ASSERT (sa->integ_icv_size <= ESP_MAX_ICV_SIZE);
132 ipsec_sa_set_async_op_ids (ipsec_sa_t * sa)
135 if (ipsec_sa_is_set_USE_ESN (sa))
138 if( sa->sync_op_data.crypto_enc_op_id == VNET_CRYPTO_OP_##n##_ENC ) \
139 sa->async_op_data.crypto_async_enc_op_id = \
140 VNET_CRYPTO_OP_##n##_TAG16_AAD12_ENC; \
141 if( sa->sync_op_data.crypto_dec_op_id == VNET_CRYPTO_OP_##n##_DEC ) \
142 sa->async_op_data.crypto_async_dec_op_id = \
143 VNET_CRYPTO_OP_##n##_TAG16_AAD12_DEC;
144 foreach_crypto_aead_alg
150 if( sa->sync_op_data.crypto_enc_op_id == VNET_CRYPTO_OP_##n##_ENC ) \
151 sa->async_op_data.crypto_async_enc_op_id = \
152 VNET_CRYPTO_OP_##n##_TAG16_AAD8_ENC; \
153 if( sa->sync_op_data.crypto_dec_op_id == VNET_CRYPTO_OP_##n##_DEC ) \
154 sa->async_op_data.crypto_async_dec_op_id = \
155 VNET_CRYPTO_OP_##n##_TAG16_AAD8_DEC;
156 foreach_crypto_aead_alg
160 #define _(c, h, s, k ,d) \
161 if( sa->sync_op_data.crypto_enc_op_id == VNET_CRYPTO_OP_##c##_ENC && \
162 sa->sync_op_data.integ_op_id == VNET_CRYPTO_OP_##h##_HMAC) \
163 sa->async_op_data.crypto_async_enc_op_id = \
164 VNET_CRYPTO_OP_##c##_##h##_TAG##d##_ENC; \
165 if( sa->sync_op_data.crypto_dec_op_id == VNET_CRYPTO_OP_##c##_DEC && \
166 sa->sync_op_data.integ_op_id == VNET_CRYPTO_OP_##h##_HMAC) \
167 sa->async_op_data.crypto_async_dec_op_id = \
168 VNET_CRYPTO_OP_##c##_##h##_TAG##d##_DEC;
169 foreach_crypto_link_async_alg
175 ipsec_sa_add_and_lock (u32 id, u32 spi, ipsec_protocol_t proto,
176 ipsec_crypto_alg_t crypto_alg, const ipsec_key_t *ck,
177 ipsec_integ_alg_t integ_alg, const ipsec_key_t *ik,
178 ipsec_sa_flags_t flags, u32 salt, u16 src_port,
179 u16 dst_port, const tunnel_t *tun, u32 *sa_out_index)
181 vlib_main_t *vm = vlib_get_main ();
182 ipsec_main_t *im = &ipsec_main;
189 p = hash_get (im->sa_index_by_sa_id, id);
191 return VNET_API_ERROR_ENTRY_ALREADY_EXISTS;
193 pool_get_aligned_zero (ipsec_sa_pool, sa, CLIB_CACHE_LINE_BYTES);
195 fib_node_init (&sa->node, FIB_NODE_TYPE_IPSEC_SA);
196 fib_node_lock (&sa->node);
197 sa_index = sa - ipsec_sa_pool;
199 vlib_validate_combined_counter (&ipsec_sa_counters, sa_index);
200 vlib_zero_combined_counter (&ipsec_sa_counters, sa_index);
201 vlib_validate_simple_counter (&ipsec_sa_lost_counters, sa_index);
202 vlib_zero_simple_counter (&ipsec_sa_lost_counters, sa_index);
204 tunnel_copy (tun, &sa->tunnel);
207 sa->stat_index = sa_index;
208 sa->protocol = proto;
211 sa->thread_index = (vlib_num_workers ()) ? ~0 : 0;
212 if (integ_alg != IPSEC_INTEG_ALG_NONE)
214 ipsec_sa_set_integ_alg (sa, integ_alg);
215 clib_memcpy (&sa->integ_key, ik, sizeof (sa->integ_key));
217 ipsec_sa_set_crypto_alg (sa, crypto_alg);
218 ipsec_sa_set_async_op_ids (sa);
220 clib_memcpy (&sa->crypto_key, ck, sizeof (sa->crypto_key));
222 sa->crypto_key_index = vnet_crypto_key_add (vm,
223 im->crypto_algs[crypto_alg].alg,
224 (u8 *) ck->data, ck->len);
225 if (~0 == sa->crypto_key_index)
227 pool_put (ipsec_sa_pool, sa);
228 return VNET_API_ERROR_KEY_LENGTH;
231 if (integ_alg != IPSEC_INTEG_ALG_NONE)
233 sa->integ_key_index = vnet_crypto_key_add (vm,
235 integ_algs[integ_alg].alg,
236 (u8 *) ik->data, ik->len);
237 if (~0 == sa->integ_key_index)
239 pool_put (ipsec_sa_pool, sa);
240 return VNET_API_ERROR_KEY_LENGTH;
244 if (sa->async_op_data.crypto_async_enc_op_id &&
245 !ipsec_sa_is_set_IS_AEAD (sa))
247 sa->async_op_data.linked_key_index =
248 vnet_crypto_key_add_linked (vm, sa->crypto_key_index,
249 sa->integ_key_index);
253 sa->crypto_op_data = sa->async_op_data.data;
256 if (ipsec_sa_is_set_IS_ASYNC (sa))
258 vnet_crypto_request_async_mode (1);
259 sa->crypto_op_data = sa->async_op_data.data;
262 sa->crypto_op_data = sa->sync_op_data.data;
265 err = ipsec_check_support_cb (im, sa);
268 clib_warning ("%s", err->what);
269 pool_put (ipsec_sa_pool, sa);
270 return VNET_API_ERROR_UNIMPLEMENTED;
273 err = ipsec_call_add_del_callbacks (im, sa, sa_index, 1);
276 pool_put (ipsec_sa_pool, sa);
277 return VNET_API_ERROR_SYSCALL_ERROR_1;
280 if (ipsec_sa_is_set_IS_TUNNEL (sa) &&
281 AF_IP6 == ip_addr_version (&tun->t_src))
282 ipsec_sa_set_IS_TUNNEL_V6 (sa);
284 if (ipsec_sa_is_set_IS_TUNNEL (sa) && !ipsec_sa_is_set_IS_INBOUND (sa))
286 sa->tunnel_flags = sa->tunnel.t_encap_decap_flags;
288 rv = tunnel_resolve (&sa->tunnel, FIB_NODE_TYPE_IPSEC_SA, sa_index);
292 pool_put (ipsec_sa_pool, sa);
297 /* generate header templates */
298 if (ipsec_sa_is_set_IS_TUNNEL_V6 (sa))
300 tunnel_build_v6_hdr (&sa->tunnel,
301 (ipsec_sa_is_set_UDP_ENCAP (sa) ?
303 IP_PROTOCOL_IPSEC_ESP),
308 tunnel_build_v4_hdr (&sa->tunnel,
309 (ipsec_sa_is_set_UDP_ENCAP (sa) ?
311 IP_PROTOCOL_IPSEC_ESP),
316 if (ipsec_sa_is_set_UDP_ENCAP (sa))
318 if (dst_port == IPSEC_UDP_PORT_NONE)
319 sa->udp_hdr.dst_port = clib_host_to_net_u16 (UDP_DST_PORT_ipsec);
321 sa->udp_hdr.dst_port = clib_host_to_net_u16 (dst_port);
323 if (src_port == IPSEC_UDP_PORT_NONE)
324 sa->udp_hdr.src_port = clib_host_to_net_u16 (UDP_DST_PORT_ipsec);
326 sa->udp_hdr.src_port = clib_host_to_net_u16 (src_port);
328 if (ipsec_sa_is_set_IS_INBOUND (sa))
329 ipsec_register_udp_port (clib_host_to_net_u16 (sa->udp_hdr.dst_port),
330 !ipsec_sa_is_set_IS_TUNNEL_V6 (sa));
333 hash_set (im->sa_index_by_sa_id, sa->id, sa_index);
336 *sa_out_index = sa_index;
342 ipsec_sa_del (ipsec_sa_t * sa)
344 vlib_main_t *vm = vlib_get_main ();
345 ipsec_main_t *im = &ipsec_main;
348 sa_index = sa - ipsec_sa_pool;
349 hash_unset (im->sa_index_by_sa_id, sa->id);
350 tunnel_unresolve (&sa->tunnel);
352 /* no recovery possible when deleting an SA */
353 (void) ipsec_call_add_del_callbacks (im, sa, sa_index, 0);
355 if (ipsec_sa_is_set_IS_ASYNC (sa))
356 vnet_crypto_request_async_mode (0);
357 if (ipsec_sa_is_set_UDP_ENCAP (sa) && ipsec_sa_is_set_IS_INBOUND (sa))
358 ipsec_unregister_udp_port (clib_net_to_host_u16 (sa->udp_hdr.dst_port),
359 !ipsec_sa_is_set_IS_TUNNEL_V6 (sa));
361 if (ipsec_sa_is_set_IS_TUNNEL (sa) && !ipsec_sa_is_set_IS_INBOUND (sa))
362 dpo_reset (&sa->dpo);
363 vnet_crypto_key_del (vm, sa->crypto_key_index);
364 if (sa->integ_alg != IPSEC_INTEG_ALG_NONE)
365 vnet_crypto_key_del (vm, sa->integ_key_index);
366 pool_put (ipsec_sa_pool, sa);
370 ipsec_sa_unlock (index_t sai)
374 if (INDEX_INVALID == sai)
377 sa = ipsec_sa_get (sai);
379 fib_node_unlock (&sa->node);
383 ipsec_sa_lock (index_t sai)
387 if (INDEX_INVALID == sai)
390 sa = ipsec_sa_get (sai);
392 fib_node_lock (&sa->node);
396 ipsec_sa_find_and_lock (u32 id)
398 ipsec_main_t *im = &ipsec_main;
402 p = hash_get (im->sa_index_by_sa_id, id);
405 return INDEX_INVALID;
407 sa = ipsec_sa_get (p[0]);
409 fib_node_lock (&sa->node);
415 ipsec_sa_unlock_id (u32 id)
417 ipsec_main_t *im = &ipsec_main;
420 p = hash_get (im->sa_index_by_sa_id, id);
423 return VNET_API_ERROR_NO_SUCH_ENTRY;
425 ipsec_sa_unlock (p[0]);
431 ipsec_sa_clear (index_t sai)
433 vlib_zero_combined_counter (&ipsec_sa_counters, sai);
434 vlib_zero_simple_counter (&ipsec_sa_lost_counters, sai);
438 ipsec_sa_walk (ipsec_sa_walk_cb_t cb, void *ctx)
443 pool_foreach (sa, ipsec_sa_pool)
445 if (WALK_CONTINUE != cb (sa, ctx))
452 * Function definition to get a FIB node from its index
455 ipsec_sa_fib_node_get (fib_node_index_t index)
459 sa = ipsec_sa_get (index);
465 ipsec_sa_from_fib_node (fib_node_t * node)
467 ASSERT (FIB_NODE_TYPE_IPSEC_SA == node->fn_type);
468 return ((ipsec_sa_t *) (((char *) node) -
469 STRUCT_OFFSET_OF (ipsec_sa_t, node)));
474 * Function definition to inform the FIB node that its last lock has gone.
477 ipsec_sa_last_lock_gone (fib_node_t * node)
480 * The ipsec SA is a root of the graph. As such
481 * it never has children and thus is never locked.
483 ipsec_sa_del (ipsec_sa_from_fib_node (node));
487 * Function definition to backwalk a FIB node
489 static fib_node_back_walk_rc_t
490 ipsec_sa_back_walk (fib_node_t * node, fib_node_back_walk_ctx_t * ctx)
492 ipsec_sa_stack (ipsec_sa_from_fib_node (node));
494 return (FIB_NODE_BACK_WALK_CONTINUE);
498 * Virtual function table registered by SAs
499 * for participation in the FIB object graph.
501 const static fib_node_vft_t ipsec_sa_vft = {
502 .fnv_get = ipsec_sa_fib_node_get,
503 .fnv_last_lock = ipsec_sa_last_lock_gone,
504 .fnv_back_walk = ipsec_sa_back_walk,
507 /* force inclusion from application's main.c */
509 ipsec_sa_interface_init (vlib_main_t * vm)
511 fib_node_register_type (FIB_NODE_TYPE_IPSEC_SA, &ipsec_sa_vft);
516 VLIB_INIT_FUNCTION (ipsec_sa_interface_init);
519 * fd.io coding-style-patch-verification: ON
522 * eval: (c-set-style "gnu")