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.h>
19 #include <vnet/fib/fib_table.h>
23 * SA packet & bytes counters
25 vlib_combined_counter_main_t ipsec_sa_counters = {
27 .stat_segment_name = "/net/ipsec/sa",
32 ipsec_call_add_del_callbacks (ipsec_main_t * im, ipsec_sa_t * sa,
33 u32 sa_index, int is_add)
35 ipsec_ah_backend_t *ab;
36 ipsec_esp_backend_t *eb;
39 case IPSEC_PROTOCOL_AH:
40 ab = pool_elt_at_index (im->ah_backends, im->ah_current_backend);
41 if (ab->add_del_sa_sess_cb)
42 return ab->add_del_sa_sess_cb (sa_index, is_add);
44 case IPSEC_PROTOCOL_ESP:
45 eb = pool_elt_at_index (im->esp_backends, im->esp_current_backend);
46 if (eb->add_del_sa_sess_cb)
47 return eb->add_del_sa_sess_cb (sa_index, is_add);
54 ipsec_mk_key (ipsec_key_t * key, const u8 * data, u8 len)
56 memset (key, 0, sizeof (*key));
58 if (len > sizeof (key->data))
59 key->len = sizeof (key->data);
63 memcpy (key->data, data, key->len);
67 * 'stack' (resolve the recursion for) the SA tunnel destination
70 ipsec_sa_stack (ipsec_sa_t * sa)
72 ipsec_main_t *im = &ipsec_main;
73 fib_forward_chain_type_t fct;
74 dpo_id_t tmp = DPO_INVALID;
77 fib_forw_chain_type_from_fib_proto ((ipsec_sa_is_set_IS_TUNNEL_V6 (sa) ?
81 fib_entry_contribute_forwarding (sa->fib_entry_index, fct, &tmp);
83 dpo_stack_from_node ((ipsec_sa_is_set_IS_TUNNEL_V6 (sa) ?
84 im->ah6_encrypt_node_index :
85 im->ah4_encrypt_node_index),
86 &sa->dpo[IPSEC_PROTOCOL_AH], &tmp);
87 dpo_stack_from_node ((ipsec_sa_is_set_IS_TUNNEL_V6 (sa) ?
88 im->esp6_encrypt_node_index :
89 im->esp4_encrypt_node_index),
90 &sa->dpo[IPSEC_PROTOCOL_ESP], &tmp);
95 ipsec_sa_set_crypto_alg (ipsec_sa_t * sa, ipsec_crypto_alg_t crypto_alg)
97 ipsec_main_t *im = &ipsec_main;
98 sa->crypto_alg = crypto_alg;
99 sa->crypto_iv_size = im->crypto_algs[crypto_alg].iv_size;
100 sa->crypto_block_size = im->crypto_algs[crypto_alg].block_size;
101 sa->crypto_enc_op_type = im->crypto_algs[crypto_alg].enc_op_type;
102 sa->crypto_dec_op_type = im->crypto_algs[crypto_alg].dec_op_type;
103 ASSERT (sa->crypto_block_size <= ESP_MAX_BLOCK_SIZE);
107 ipsec_sa_set_integ_alg (ipsec_sa_t * sa, ipsec_integ_alg_t integ_alg)
109 ipsec_main_t *im = &ipsec_main;
110 sa->integ_alg = integ_alg;
111 sa->integ_trunc_size = im->integ_algs[integ_alg].trunc_size;
112 sa->integ_op_type = im->integ_algs[integ_alg].op_type;
113 ASSERT (sa->integ_trunc_size <= ESP_MAX_ICV_SIZE);
117 ipsec_sa_add (u32 id,
119 ipsec_protocol_t proto,
120 ipsec_crypto_alg_t crypto_alg,
121 const ipsec_key_t * ck,
122 ipsec_integ_alg_t integ_alg,
123 const ipsec_key_t * ik,
124 ipsec_sa_flags_t flags,
126 const ip46_address_t * tun_src,
127 const ip46_address_t * tun_dst, u32 * sa_out_index)
129 ipsec_main_t *im = &ipsec_main;
135 p = hash_get (im->sa_index_by_sa_id, id);
137 return VNET_API_ERROR_ENTRY_ALREADY_EXISTS;
139 pool_get_aligned_zero (im->sad, sa, CLIB_CACHE_LINE_BYTES);
141 fib_node_init (&sa->node, FIB_NODE_TYPE_IPSEC_SA);
142 sa_index = sa - im->sad;
144 vlib_validate_combined_counter (&ipsec_sa_counters, sa_index);
145 vlib_zero_combined_counter (&ipsec_sa_counters, sa_index);
149 sa->stat_index = sa_index;
150 sa->protocol = proto;
151 ipsec_sa_set_crypto_alg (sa, crypto_alg);
152 clib_memcpy (&sa->crypto_key, ck, sizeof (sa->crypto_key));
153 ipsec_sa_set_integ_alg (sa, integ_alg);
154 clib_memcpy (&sa->integ_key, ik, sizeof (sa->integ_key));
155 ip46_address_copy (&sa->tunnel_src_addr, tun_src);
156 ip46_address_copy (&sa->tunnel_dst_addr, tun_dst);
158 if (flags & IPSEC_SA_FLAG_USE_EXTENDED_SEQ_NUM)
159 ipsec_sa_set_USE_EXTENDED_SEQ_NUM (sa);
160 if (flags & IPSEC_SA_FLAG_USE_ANTI_REPLAY)
161 ipsec_sa_set_USE_ANTI_REPLAY (sa);
162 if (flags & IPSEC_SA_FLAG_IS_TUNNEL)
163 ipsec_sa_set_IS_TUNNEL (sa);
164 if (flags & IPSEC_SA_FLAG_IS_TUNNEL_V6)
165 ipsec_sa_set_IS_TUNNEL_V6 (sa);
166 if (flags & IPSEC_SA_FLAG_UDP_ENCAP)
167 ipsec_sa_set_UDP_ENCAP (sa);
169 err = ipsec_check_support_cb (im, sa);
172 clib_warning ("%s", err->what);
173 pool_put (im->sad, sa);
174 return VNET_API_ERROR_UNIMPLEMENTED;
177 err = ipsec_call_add_del_callbacks (im, sa, sa_index, 1);
180 pool_put (im->sad, sa);
181 return VNET_API_ERROR_SYSCALL_ERROR_1;
184 if (ipsec_sa_is_set_IS_TUNNEL (sa))
186 fib_protocol_t fproto = (ipsec_sa_is_set_IS_TUNNEL_V6 (sa) ?
187 FIB_PROTOCOL_IP6 : FIB_PROTOCOL_IP4);
189 .fp_addr = sa->tunnel_dst_addr,
190 .fp_len = (ipsec_sa_is_set_IS_TUNNEL_V6 (sa) ? 128 : 32),
193 sa->tx_fib_index = fib_table_find (fproto, tx_table_id);
194 if (sa->tx_fib_index == ~((u32) 0))
196 pool_put (im->sad, sa);
197 return VNET_API_ERROR_NO_SUCH_FIB;
200 sa->fib_entry_index = fib_table_entry_special_add (sa->tx_fib_index,
203 FIB_ENTRY_FLAG_NONE);
204 sa->sibling = fib_entry_child_add (sa->fib_entry_index,
205 FIB_NODE_TYPE_IPSEC_SA, sa_index);
208 /* generate header templates */
209 if (ipsec_sa_is_set_IS_TUNNEL_V6 (sa))
211 sa->ip6_hdr.ip_version_traffic_class_and_flow_label = 0x60;
212 sa->ip6_hdr.hop_limit = 254;
213 sa->ip6_hdr.src_address.as_u64[0] =
214 sa->tunnel_src_addr.ip6.as_u64[0];
215 sa->ip6_hdr.src_address.as_u64[1] =
216 sa->tunnel_src_addr.ip6.as_u64[1];
217 sa->ip6_hdr.dst_address.as_u64[0] =
218 sa->tunnel_dst_addr.ip6.as_u64[0];
219 sa->ip6_hdr.dst_address.as_u64[1] =
220 sa->tunnel_dst_addr.ip6.as_u64[1];
221 if (ipsec_sa_is_set_UDP_ENCAP (sa))
222 sa->ip6_hdr.protocol = IP_PROTOCOL_UDP;
224 sa->ip6_hdr.protocol = IP_PROTOCOL_IPSEC_ESP;
228 sa->ip4_hdr.ip_version_and_header_length = 0x45;
229 sa->ip4_hdr.ttl = 254;
230 sa->ip4_hdr.src_address.as_u32 = sa->tunnel_src_addr.ip4.as_u32;
231 sa->ip4_hdr.dst_address.as_u32 = sa->tunnel_dst_addr.ip4.as_u32;
233 if (ipsec_sa_is_set_UDP_ENCAP (sa))
234 sa->ip4_hdr.protocol = IP_PROTOCOL_UDP;
236 sa->ip4_hdr.protocol = IP_PROTOCOL_IPSEC_ESP;
237 sa->ip4_hdr.checksum = ip4_header_checksum (&sa->ip4_hdr);
241 if (ipsec_sa_is_set_UDP_ENCAP (sa))
243 sa->udp_hdr.src_port = clib_host_to_net_u16 (UDP_DST_PORT_ipsec);
244 sa->udp_hdr.dst_port = clib_host_to_net_u16 (UDP_DST_PORT_ipsec);
247 hash_set (im->sa_index_by_sa_id, sa->id, sa_index);
250 *sa_out_index = sa_index;
256 ipsec_sa_del (u32 id)
258 ipsec_main_t *im = &ipsec_main;
264 p = hash_get (im->sa_index_by_sa_id, id);
267 return VNET_API_ERROR_NO_SUCH_ENTRY;
270 sa = pool_elt_at_index (im->sad, sa_index);
271 if (ipsec_is_sa_used (sa_index))
273 clib_warning ("sa_id %u used in policy", sa->id);
274 /* sa used in policy */
275 return VNET_API_ERROR_SYSCALL_ERROR_1;
277 hash_unset (im->sa_index_by_sa_id, sa->id);
278 err = ipsec_call_add_del_callbacks (im, sa, sa_index, 0);
280 return VNET_API_ERROR_SYSCALL_ERROR_1;
282 if (ipsec_sa_is_set_IS_TUNNEL (sa))
284 fib_entry_child_remove (sa->fib_entry_index, sa->sibling);
285 fib_table_entry_special_remove
287 fib_entry_get_prefix (sa->fib_entry_index), FIB_SOURCE_RR);
288 dpo_reset (&sa->dpo[IPSEC_PROTOCOL_AH]);
289 dpo_reset (&sa->dpo[IPSEC_PROTOCOL_ESP]);
291 pool_put (im->sad, sa);
296 ipsec_is_sa_used (u32 sa_index)
298 ipsec_main_t *im = &ipsec_main;
299 ipsec_tunnel_if_t *t;
303 pool_foreach(p, im->policies, ({
304 if (p->policy == IPSEC_POLICY_ACTION_PROTECT)
306 if (p->sa_index == sa_index)
311 pool_foreach(t, im->tunnel_interfaces, ({
312 if (t->input_sa_index == sa_index)
314 if (t->output_sa_index == sa_index)
323 ipsec_set_sa_key (u32 id, const ipsec_key_t * ck, const ipsec_key_t * ik)
325 ipsec_main_t *im = &ipsec_main;
331 p = hash_get (im->sa_index_by_sa_id, id);
333 return VNET_API_ERROR_SYSCALL_ERROR_1; /* no such sa-id */
336 sa = pool_elt_at_index (im->sad, sa_index);
341 clib_memcpy (&sa->crypto_key, ck, sizeof (sa->crypto_key));
347 clib_memcpy (&sa->integ_key, 0, sizeof (sa->integ_key));
352 err = ipsec_call_add_del_callbacks (im, sa, sa_index, 0);
355 clib_error_free (err);
356 return VNET_API_ERROR_SYSCALL_ERROR_1;
364 ipsec_get_sa_index_by_sa_id (u32 sa_id)
366 ipsec_main_t *im = &ipsec_main;
367 uword *p = hash_get (im->sa_index_by_sa_id, sa_id);
375 ipsec_sa_walk (ipsec_sa_walk_cb_t cb, void *ctx)
377 ipsec_main_t *im = &ipsec_main;
381 pool_foreach (sa, im->sad,
383 if (WALK_CONTINUE != cb(sa, ctx))
390 * Function definition to get a FIB node from its index
393 ipsec_sa_fib_node_get (fib_node_index_t index)
399 sa = pool_elt_at_index (im->sad, index);
405 * Function definition to inform the FIB node that its last lock has gone.
408 ipsec_sa_last_lock_gone (fib_node_t * node)
411 * The ipsec SA is a root of the graph. As such
412 * it never has children and thus is never locked.
418 ipsec_sa_from_fib_node (fib_node_t * node)
420 ASSERT (FIB_NODE_TYPE_IPSEC_SA == node->fn_type);
421 return ((ipsec_sa_t *) (((char *) node) -
422 STRUCT_OFFSET_OF (ipsec_sa_t, node)));
427 * Function definition to backwalk a FIB node
429 static fib_node_back_walk_rc_t
430 ipsec_sa_back_walk (fib_node_t * node, fib_node_back_walk_ctx_t * ctx)
432 ipsec_sa_stack (ipsec_sa_from_fib_node (node));
434 return (FIB_NODE_BACK_WALK_CONTINUE);
438 * Virtual function table registered by MPLS GRE tunnels
439 * for participation in the FIB object graph.
441 const static fib_node_vft_t ipsec_sa_vft = {
442 .fnv_get = ipsec_sa_fib_node_get,
443 .fnv_last_lock = ipsec_sa_last_lock_gone,
444 .fnv_back_walk = ipsec_sa_back_walk,
447 /* force inclusion from application's main.c */
449 ipsec_sa_interface_init (vlib_main_t * vm)
451 fib_node_register_type (FIB_NODE_TYPE_IPSEC_SA, &ipsec_sa_vft);
456 VLIB_INIT_FUNCTION (ipsec_sa_interface_init);
459 * fd.io coding-style-patch-verification: ON
462 * eval: (c-set-style "gnu")