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",
34 ipsec_call_add_del_callbacks (ipsec_main_t * im, ipsec_sa_t * sa,
35 u32 sa_index, int is_add)
37 ipsec_ah_backend_t *ab;
38 ipsec_esp_backend_t *eb;
41 case IPSEC_PROTOCOL_AH:
42 ab = pool_elt_at_index (im->ah_backends, im->ah_current_backend);
43 if (ab->add_del_sa_sess_cb)
44 return ab->add_del_sa_sess_cb (sa_index, is_add);
46 case IPSEC_PROTOCOL_ESP:
47 eb = pool_elt_at_index (im->esp_backends, im->esp_current_backend);
48 if (eb->add_del_sa_sess_cb)
49 return eb->add_del_sa_sess_cb (sa_index, is_add);
56 ipsec_mk_key (ipsec_key_t * key, const u8 * data, u8 len)
58 memset (key, 0, sizeof (*key));
60 if (len > sizeof (key->data))
61 key->len = sizeof (key->data);
65 memcpy (key->data, data, key->len);
69 * 'stack' (resolve the recursion for) the SA tunnel destination
72 ipsec_sa_stack (ipsec_sa_t * sa)
74 ipsec_main_t *im = &ipsec_main;
75 fib_forward_chain_type_t fct;
76 dpo_id_t tmp = DPO_INVALID;
79 fib_forw_chain_type_from_fib_proto ((ipsec_sa_is_set_IS_TUNNEL_V6 (sa) ?
83 fib_entry_contribute_forwarding (sa->fib_entry_index, fct, &tmp);
85 if (IPSEC_PROTOCOL_AH == sa->protocol)
86 dpo_stack_from_node ((ipsec_sa_is_set_IS_TUNNEL_V6 (sa) ?
87 im->ah6_encrypt_node_index :
88 im->ah4_encrypt_node_index), &sa->dpo, &tmp);
90 dpo_stack_from_node ((ipsec_sa_is_set_IS_TUNNEL_V6 (sa) ?
91 im->esp6_encrypt_node_index :
92 im->esp4_encrypt_node_index), &sa->dpo, &tmp);
97 ipsec_sa_set_crypto_alg (ipsec_sa_t * sa, ipsec_crypto_alg_t crypto_alg)
99 ipsec_main_t *im = &ipsec_main;
100 sa->crypto_alg = crypto_alg;
101 sa->crypto_iv_size = im->crypto_algs[crypto_alg].iv_size;
102 sa->esp_block_align = clib_max (4, im->crypto_algs[crypto_alg].block_align);
103 sa->sync_op_data.crypto_enc_op_id = im->crypto_algs[crypto_alg].enc_op_id;
104 sa->sync_op_data.crypto_dec_op_id = im->crypto_algs[crypto_alg].dec_op_id;
105 sa->crypto_calg = im->crypto_algs[crypto_alg].alg;
106 ASSERT (sa->crypto_iv_size <= ESP_MAX_IV_SIZE);
107 ASSERT (sa->esp_block_align <= ESP_MAX_BLOCK_SIZE);
108 if (IPSEC_CRYPTO_ALG_IS_GCM (crypto_alg))
110 sa->integ_icv_size = im->crypto_algs[crypto_alg].icv_size;
111 ipsec_sa_set_IS_AEAD (sa);
116 ipsec_sa_set_integ_alg (ipsec_sa_t * sa, ipsec_integ_alg_t integ_alg)
118 ipsec_main_t *im = &ipsec_main;
119 sa->integ_alg = integ_alg;
120 sa->integ_icv_size = im->integ_algs[integ_alg].icv_size;
121 sa->sync_op_data.integ_op_id = im->integ_algs[integ_alg].op_id;
122 sa->integ_calg = im->integ_algs[integ_alg].alg;
123 ASSERT (sa->integ_icv_size <= ESP_MAX_ICV_SIZE);
127 ipsec_sa_set_async_op_ids (ipsec_sa_t * sa)
130 if (ipsec_sa_is_set_USE_ESN (sa))
133 if( sa->sync_op_data.crypto_enc_op_id == VNET_CRYPTO_OP_##n##_ENC ) \
134 sa->async_op_data.crypto_async_enc_op_id = \
135 VNET_CRYPTO_OP_##n##_TAG16_AAD12_ENC; \
136 if( sa->sync_op_data.crypto_dec_op_id == VNET_CRYPTO_OP_##n##_DEC ) \
137 sa->async_op_data.crypto_async_dec_op_id = \
138 VNET_CRYPTO_OP_##n##_TAG16_AAD12_DEC;
139 foreach_crypto_aead_alg
145 if( sa->sync_op_data.crypto_enc_op_id == VNET_CRYPTO_OP_##n##_ENC ) \
146 sa->async_op_data.crypto_async_enc_op_id = \
147 VNET_CRYPTO_OP_##n##_TAG16_AAD8_ENC; \
148 if( sa->sync_op_data.crypto_dec_op_id == VNET_CRYPTO_OP_##n##_DEC ) \
149 sa->async_op_data.crypto_async_dec_op_id = \
150 VNET_CRYPTO_OP_##n##_TAG16_AAD8_DEC;
151 foreach_crypto_aead_alg
155 #define _(c, h, s, k ,d) \
156 if( sa->sync_op_data.crypto_enc_op_id == VNET_CRYPTO_OP_##c##_ENC && \
157 sa->sync_op_data.integ_op_id == VNET_CRYPTO_OP_##h##_HMAC) \
158 sa->async_op_data.crypto_async_enc_op_id = \
159 VNET_CRYPTO_OP_##c##_##h##_TAG##d##_ENC; \
160 if( sa->sync_op_data.crypto_dec_op_id == VNET_CRYPTO_OP_##c##_DEC && \
161 sa->sync_op_data.integ_op_id == VNET_CRYPTO_OP_##h##_HMAC) \
162 sa->async_op_data.crypto_async_dec_op_id = \
163 VNET_CRYPTO_OP_##c##_##h##_TAG##d##_DEC;
164 foreach_crypto_link_async_alg
170 ipsec_sa_add_and_lock (u32 id,
172 ipsec_protocol_t proto,
173 ipsec_crypto_alg_t crypto_alg,
174 const ipsec_key_t * ck,
175 ipsec_integ_alg_t integ_alg,
176 const ipsec_key_t * ik,
177 ipsec_sa_flags_t flags,
180 const ip46_address_t * tun_src,
181 const ip46_address_t * tun_dst,
182 tunnel_encap_decap_flags_t tunnel_flags,
184 u32 * sa_out_index, u16 src_port, u16 dst_port)
186 vlib_main_t *vm = vlib_get_main ();
187 ipsec_main_t *im = &ipsec_main;
193 p = hash_get (im->sa_index_by_sa_id, id);
195 return VNET_API_ERROR_ENTRY_ALREADY_EXISTS;
197 pool_get_aligned_zero (im->sad, sa, CLIB_CACHE_LINE_BYTES);
199 fib_node_init (&sa->node, FIB_NODE_TYPE_IPSEC_SA);
200 fib_node_lock (&sa->node);
201 sa_index = sa - im->sad;
203 vlib_validate_combined_counter (&ipsec_sa_counters, sa_index);
204 vlib_zero_combined_counter (&ipsec_sa_counters, sa_index);
208 sa->stat_index = sa_index;
209 sa->protocol = proto;
211 sa->tunnel_flags = tunnel_flags;
214 sa->thread_index = (vlib_num_workers ()) ? ~0 : 0;
215 if (integ_alg != IPSEC_INTEG_ALG_NONE)
217 ipsec_sa_set_integ_alg (sa, integ_alg);
218 clib_memcpy (&sa->integ_key, ik, sizeof (sa->integ_key));
220 ipsec_sa_set_crypto_alg (sa, crypto_alg);
221 ipsec_sa_set_async_op_ids (sa);
223 clib_memcpy (&sa->crypto_key, ck, sizeof (sa->crypto_key));
224 ip46_address_copy (&sa->tunnel_src_addr, tun_src);
225 ip46_address_copy (&sa->tunnel_dst_addr, tun_dst);
227 sa->crypto_key_index = vnet_crypto_key_add (vm,
228 im->crypto_algs[crypto_alg].alg,
229 (u8 *) ck->data, ck->len);
230 if (~0 == sa->crypto_key_index)
232 pool_put (im->sad, sa);
233 return VNET_API_ERROR_KEY_LENGTH;
236 if (integ_alg != IPSEC_INTEG_ALG_NONE)
238 sa->integ_key_index = vnet_crypto_key_add (vm,
240 integ_algs[integ_alg].alg,
241 (u8 *) ik->data, ik->len);
242 if (~0 == sa->integ_key_index)
244 pool_put (im->sad, sa);
245 return VNET_API_ERROR_KEY_LENGTH;
249 if (sa->async_op_data.crypto_async_enc_op_id &&
250 !ipsec_sa_is_set_IS_AEAD (sa))
252 sa->async_op_data.linked_key_index =
253 vnet_crypto_key_add_linked (vm, sa->crypto_key_index,
254 sa->integ_key_index);
258 sa->crypto_op_data = sa->async_op_data.data;
260 sa->crypto_op_data = sa->sync_op_data.data;
262 err = ipsec_check_support_cb (im, sa);
265 clib_warning ("%s", err->what);
266 pool_put (im->sad, sa);
267 return VNET_API_ERROR_UNIMPLEMENTED;
270 err = ipsec_call_add_del_callbacks (im, sa, sa_index, 1);
273 pool_put (im->sad, sa);
274 return VNET_API_ERROR_SYSCALL_ERROR_1;
277 if (ipsec_sa_is_set_IS_TUNNEL (sa) && !ipsec_sa_is_set_IS_INBOUND (sa))
279 fib_protocol_t fproto = (ipsec_sa_is_set_IS_TUNNEL_V6 (sa) ?
280 FIB_PROTOCOL_IP6 : FIB_PROTOCOL_IP4);
282 .fp_addr = sa->tunnel_dst_addr,
283 .fp_len = (ipsec_sa_is_set_IS_TUNNEL_V6 (sa) ? 128 : 32),
286 sa->tx_fib_index = fib_table_find (fproto, tx_table_id);
287 if (sa->tx_fib_index == ~((u32) 0))
289 pool_put (im->sad, sa);
290 return VNET_API_ERROR_NO_SUCH_FIB;
293 sa->fib_entry_index = fib_entry_track (sa->tx_fib_index,
295 FIB_NODE_TYPE_IPSEC_SA,
296 sa_index, &sa->sibling);
299 /* generate header templates */
300 if (ipsec_sa_is_set_IS_TUNNEL_V6 (sa))
302 sa->ip6_hdr.ip_version_traffic_class_and_flow_label = 0x60;
303 ip6_set_dscp_network_order (&sa->ip6_hdr, sa->dscp);
305 sa->ip6_hdr.hop_limit = 254;
306 sa->ip6_hdr.src_address.as_u64[0] =
307 sa->tunnel_src_addr.ip6.as_u64[0];
308 sa->ip6_hdr.src_address.as_u64[1] =
309 sa->tunnel_src_addr.ip6.as_u64[1];
310 sa->ip6_hdr.dst_address.as_u64[0] =
311 sa->tunnel_dst_addr.ip6.as_u64[0];
312 sa->ip6_hdr.dst_address.as_u64[1] =
313 sa->tunnel_dst_addr.ip6.as_u64[1];
314 if (ipsec_sa_is_set_UDP_ENCAP (sa))
315 sa->ip6_hdr.protocol = IP_PROTOCOL_UDP;
317 sa->ip6_hdr.protocol = IP_PROTOCOL_IPSEC_ESP;
321 sa->ip4_hdr.ip_version_and_header_length = 0x45;
322 sa->ip4_hdr.ttl = 254;
323 sa->ip4_hdr.src_address.as_u32 = sa->tunnel_src_addr.ip4.as_u32;
324 sa->ip4_hdr.dst_address.as_u32 = sa->tunnel_dst_addr.ip4.as_u32;
325 sa->ip4_hdr.tos = sa->dscp << 2;
327 if (ipsec_sa_is_set_UDP_ENCAP (sa))
328 sa->ip4_hdr.protocol = IP_PROTOCOL_UDP;
330 sa->ip4_hdr.protocol = IP_PROTOCOL_IPSEC_ESP;
331 sa->ip4_hdr.checksum = ip4_header_checksum (&sa->ip4_hdr);
335 if (ipsec_sa_is_set_UDP_ENCAP (sa))
337 if (dst_port == IPSEC_UDP_PORT_NONE)
338 sa->udp_hdr.dst_port = clib_host_to_net_u16 (UDP_DST_PORT_ipsec);
340 sa->udp_hdr.dst_port = clib_host_to_net_u16 (dst_port);
342 if (src_port == IPSEC_UDP_PORT_NONE)
343 sa->udp_hdr.src_port = clib_host_to_net_u16 (UDP_DST_PORT_ipsec);
345 sa->udp_hdr.src_port = clib_host_to_net_u16 (src_port);
347 if (ipsec_sa_is_set_IS_INBOUND (sa))
348 ipsec_register_udp_port (clib_host_to_net_u16 (sa->udp_hdr.dst_port));
351 hash_set (im->sa_index_by_sa_id, sa->id, sa_index);
354 *sa_out_index = sa_index;
360 ipsec_sa_del (ipsec_sa_t * sa)
362 vlib_main_t *vm = vlib_get_main ();
363 ipsec_main_t *im = &ipsec_main;
366 sa_index = sa - im->sad;
367 hash_unset (im->sa_index_by_sa_id, sa->id);
369 /* no recovery possible when deleting an SA */
370 (void) ipsec_call_add_del_callbacks (im, sa, sa_index, 0);
372 if (ipsec_sa_is_set_UDP_ENCAP (sa) && ipsec_sa_is_set_IS_INBOUND (sa))
373 ipsec_unregister_udp_port (clib_net_to_host_u16 (sa->udp_hdr.dst_port));
375 if (ipsec_sa_is_set_IS_TUNNEL (sa) && !ipsec_sa_is_set_IS_INBOUND (sa))
377 fib_entry_untrack (sa->fib_entry_index, sa->sibling);
378 dpo_reset (&sa->dpo);
380 vnet_crypto_key_del (vm, sa->crypto_key_index);
381 if (sa->integ_alg != IPSEC_INTEG_ALG_NONE)
382 vnet_crypto_key_del (vm, sa->integ_key_index);
383 pool_put (im->sad, sa);
387 ipsec_sa_unlock (index_t sai)
389 ipsec_main_t *im = &ipsec_main;
392 if (INDEX_INVALID == sai)
395 sa = pool_elt_at_index (im->sad, sai);
397 fib_node_unlock (&sa->node);
401 ipsec_sa_lock (index_t sai)
403 ipsec_main_t *im = &ipsec_main;
406 if (INDEX_INVALID == sai)
409 sa = pool_elt_at_index (im->sad, sai);
411 fib_node_lock (&sa->node);
415 ipsec_sa_find_and_lock (u32 id)
417 ipsec_main_t *im = &ipsec_main;
421 p = hash_get (im->sa_index_by_sa_id, id);
424 return INDEX_INVALID;
426 sa = pool_elt_at_index (im->sad, p[0]);
428 fib_node_lock (&sa->node);
434 ipsec_sa_unlock_id (u32 id)
436 ipsec_main_t *im = &ipsec_main;
439 p = hash_get (im->sa_index_by_sa_id, id);
442 return VNET_API_ERROR_NO_SUCH_ENTRY;
444 ipsec_sa_unlock (p[0]);
450 ipsec_sa_clear (index_t sai)
452 vlib_zero_combined_counter (&ipsec_sa_counters, sai);
456 ipsec_sa_walk (ipsec_sa_walk_cb_t cb, void *ctx)
458 ipsec_main_t *im = &ipsec_main;
462 pool_foreach (sa, im->sad)
464 if (WALK_CONTINUE != cb(sa, ctx))
471 * Function definition to get a FIB node from its index
474 ipsec_sa_fib_node_get (fib_node_index_t index)
480 sa = pool_elt_at_index (im->sad, index);
486 ipsec_sa_from_fib_node (fib_node_t * node)
488 ASSERT (FIB_NODE_TYPE_IPSEC_SA == node->fn_type);
489 return ((ipsec_sa_t *) (((char *) node) -
490 STRUCT_OFFSET_OF (ipsec_sa_t, node)));
495 * Function definition to inform the FIB node that its last lock has gone.
498 ipsec_sa_last_lock_gone (fib_node_t * node)
501 * The ipsec SA is a root of the graph. As such
502 * it never has children and thus is never locked.
504 ipsec_sa_del (ipsec_sa_from_fib_node (node));
508 * Function definition to backwalk a FIB node
510 static fib_node_back_walk_rc_t
511 ipsec_sa_back_walk (fib_node_t * node, fib_node_back_walk_ctx_t * ctx)
513 ipsec_sa_stack (ipsec_sa_from_fib_node (node));
515 return (FIB_NODE_BACK_WALK_CONTINUE);
519 * Virtual function table registered by SAs
520 * for participation in the FIB object graph.
522 const static fib_node_vft_t ipsec_sa_vft = {
523 .fnv_get = ipsec_sa_fib_node_get,
524 .fnv_last_lock = ipsec_sa_last_lock_gone,
525 .fnv_back_walk = ipsec_sa_back_walk,
528 /* force inclusion from application's main.c */
530 ipsec_sa_interface_init (vlib_main_t * vm)
532 fib_node_register_type (FIB_NODE_TYPE_IPSEC_SA, &ipsec_sa_vft);
537 VLIB_INIT_FUNCTION (ipsec_sa_interface_init);
540 * fd.io coding-style-patch-verification: ON
543 * eval: (c-set-style "gnu")