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_iv_size <= ESP_MAX_IV_SIZE);
104 ASSERT (sa->crypto_block_size <= ESP_MAX_BLOCK_SIZE);
108 ipsec_sa_set_integ_alg (ipsec_sa_t * sa, ipsec_integ_alg_t integ_alg)
110 ipsec_main_t *im = &ipsec_main;
111 sa->integ_alg = integ_alg;
112 sa->integ_trunc_size = im->integ_algs[integ_alg].trunc_size;
113 sa->integ_op_type = im->integ_algs[integ_alg].op_type;
114 ASSERT (sa->integ_trunc_size <= ESP_MAX_ICV_SIZE);
118 ipsec_sa_add (u32 id,
120 ipsec_protocol_t proto,
121 ipsec_crypto_alg_t crypto_alg,
122 const ipsec_key_t * ck,
123 ipsec_integ_alg_t integ_alg,
124 const ipsec_key_t * ik,
125 ipsec_sa_flags_t flags,
127 const ip46_address_t * tun_src,
128 const ip46_address_t * tun_dst, u32 * sa_out_index)
130 ipsec_main_t *im = &ipsec_main;
136 p = hash_get (im->sa_index_by_sa_id, id);
138 return VNET_API_ERROR_ENTRY_ALREADY_EXISTS;
140 pool_get_aligned_zero (im->sad, sa, CLIB_CACHE_LINE_BYTES);
142 fib_node_init (&sa->node, FIB_NODE_TYPE_IPSEC_SA);
143 sa_index = sa - im->sad;
145 vlib_validate_combined_counter (&ipsec_sa_counters, sa_index);
146 vlib_zero_combined_counter (&ipsec_sa_counters, sa_index);
150 sa->stat_index = sa_index;
151 sa->protocol = proto;
153 ipsec_sa_set_crypto_alg (sa, crypto_alg);
154 clib_memcpy (&sa->crypto_key, ck, sizeof (sa->crypto_key));
155 ipsec_sa_set_integ_alg (sa, integ_alg);
156 clib_memcpy (&sa->integ_key, ik, sizeof (sa->integ_key));
157 ip46_address_copy (&sa->tunnel_src_addr, tun_src);
158 ip46_address_copy (&sa->tunnel_dst_addr, tun_dst);
160 err = ipsec_check_support_cb (im, sa);
163 clib_warning ("%s", err->what);
164 pool_put (im->sad, sa);
165 return VNET_API_ERROR_UNIMPLEMENTED;
168 err = ipsec_call_add_del_callbacks (im, sa, sa_index, 1);
171 pool_put (im->sad, sa);
172 return VNET_API_ERROR_SYSCALL_ERROR_1;
175 if (ipsec_sa_is_set_IS_TUNNEL (sa) && !ipsec_sa_is_set_IS_INBOUND (sa))
177 fib_protocol_t fproto = (ipsec_sa_is_set_IS_TUNNEL_V6 (sa) ?
178 FIB_PROTOCOL_IP6 : FIB_PROTOCOL_IP4);
180 .fp_addr = sa->tunnel_dst_addr,
181 .fp_len = (ipsec_sa_is_set_IS_TUNNEL_V6 (sa) ? 128 : 32),
184 sa->tx_fib_index = fib_table_find (fproto, tx_table_id);
185 if (sa->tx_fib_index == ~((u32) 0))
187 pool_put (im->sad, sa);
188 return VNET_API_ERROR_NO_SUCH_FIB;
191 sa->fib_entry_index = fib_table_entry_special_add (sa->tx_fib_index,
194 FIB_ENTRY_FLAG_NONE);
195 sa->sibling = fib_entry_child_add (sa->fib_entry_index,
196 FIB_NODE_TYPE_IPSEC_SA, sa_index);
199 /* generate header templates */
200 if (ipsec_sa_is_set_IS_TUNNEL_V6 (sa))
202 sa->ip6_hdr.ip_version_traffic_class_and_flow_label = 0x60;
203 sa->ip6_hdr.hop_limit = 254;
204 sa->ip6_hdr.src_address.as_u64[0] =
205 sa->tunnel_src_addr.ip6.as_u64[0];
206 sa->ip6_hdr.src_address.as_u64[1] =
207 sa->tunnel_src_addr.ip6.as_u64[1];
208 sa->ip6_hdr.dst_address.as_u64[0] =
209 sa->tunnel_dst_addr.ip6.as_u64[0];
210 sa->ip6_hdr.dst_address.as_u64[1] =
211 sa->tunnel_dst_addr.ip6.as_u64[1];
212 if (ipsec_sa_is_set_UDP_ENCAP (sa))
213 sa->ip6_hdr.protocol = IP_PROTOCOL_UDP;
215 sa->ip6_hdr.protocol = IP_PROTOCOL_IPSEC_ESP;
219 sa->ip4_hdr.ip_version_and_header_length = 0x45;
220 sa->ip4_hdr.ttl = 254;
221 sa->ip4_hdr.src_address.as_u32 = sa->tunnel_src_addr.ip4.as_u32;
222 sa->ip4_hdr.dst_address.as_u32 = sa->tunnel_dst_addr.ip4.as_u32;
224 if (ipsec_sa_is_set_UDP_ENCAP (sa))
225 sa->ip4_hdr.protocol = IP_PROTOCOL_UDP;
227 sa->ip4_hdr.protocol = IP_PROTOCOL_IPSEC_ESP;
228 sa->ip4_hdr.checksum = ip4_header_checksum (&sa->ip4_hdr);
232 if (ipsec_sa_is_set_UDP_ENCAP (sa))
234 sa->udp_hdr.src_port = clib_host_to_net_u16 (UDP_DST_PORT_ipsec);
235 sa->udp_hdr.dst_port = clib_host_to_net_u16 (UDP_DST_PORT_ipsec);
238 hash_set (im->sa_index_by_sa_id, sa->id, sa_index);
241 *sa_out_index = sa_index;
247 ipsec_sa_del (u32 id)
249 ipsec_main_t *im = &ipsec_main;
255 p = hash_get (im->sa_index_by_sa_id, id);
258 return VNET_API_ERROR_NO_SUCH_ENTRY;
261 sa = pool_elt_at_index (im->sad, sa_index);
262 if (ipsec_is_sa_used (sa_index))
264 clib_warning ("sa_id %u used in policy", sa->id);
265 /* sa used in policy */
266 return VNET_API_ERROR_SYSCALL_ERROR_1;
268 hash_unset (im->sa_index_by_sa_id, sa->id);
269 err = ipsec_call_add_del_callbacks (im, sa, sa_index, 0);
271 return VNET_API_ERROR_SYSCALL_ERROR_1;
273 if (ipsec_sa_is_set_IS_TUNNEL (sa) && !ipsec_sa_is_set_IS_INBOUND (sa))
275 fib_entry_child_remove (sa->fib_entry_index, sa->sibling);
276 fib_table_entry_special_remove
278 fib_entry_get_prefix (sa->fib_entry_index), FIB_SOURCE_RR);
279 dpo_reset (&sa->dpo[IPSEC_PROTOCOL_AH]);
280 dpo_reset (&sa->dpo[IPSEC_PROTOCOL_ESP]);
282 pool_put (im->sad, sa);
287 ipsec_is_sa_used (u32 sa_index)
289 ipsec_main_t *im = &ipsec_main;
290 ipsec_tunnel_if_t *t;
294 pool_foreach(p, im->policies, ({
295 if (p->policy == IPSEC_POLICY_ACTION_PROTECT)
297 if (p->sa_index == sa_index)
302 pool_foreach(t, im->tunnel_interfaces, ({
303 if (t->input_sa_index == sa_index)
305 if (t->output_sa_index == sa_index)
314 ipsec_set_sa_key (u32 id, const ipsec_key_t * ck, const ipsec_key_t * ik)
316 ipsec_main_t *im = &ipsec_main;
322 p = hash_get (im->sa_index_by_sa_id, id);
324 return VNET_API_ERROR_SYSCALL_ERROR_1; /* no such sa-id */
327 sa = pool_elt_at_index (im->sad, sa_index);
332 clib_memcpy (&sa->crypto_key, ck, sizeof (sa->crypto_key));
338 clib_memcpy (&sa->integ_key, 0, sizeof (sa->integ_key));
343 err = ipsec_call_add_del_callbacks (im, sa, sa_index, 0);
346 clib_error_free (err);
347 return VNET_API_ERROR_SYSCALL_ERROR_1;
355 ipsec_get_sa_index_by_sa_id (u32 sa_id)
357 ipsec_main_t *im = &ipsec_main;
358 uword *p = hash_get (im->sa_index_by_sa_id, sa_id);
366 ipsec_sa_walk (ipsec_sa_walk_cb_t cb, void *ctx)
368 ipsec_main_t *im = &ipsec_main;
372 pool_foreach (sa, im->sad,
374 if (WALK_CONTINUE != cb(sa, ctx))
381 * Function definition to get a FIB node from its index
384 ipsec_sa_fib_node_get (fib_node_index_t index)
390 sa = pool_elt_at_index (im->sad, index);
396 * Function definition to inform the FIB node that its last lock has gone.
399 ipsec_sa_last_lock_gone (fib_node_t * node)
402 * The ipsec SA is a root of the graph. As such
403 * it never has children and thus is never locked.
409 ipsec_sa_from_fib_node (fib_node_t * node)
411 ASSERT (FIB_NODE_TYPE_IPSEC_SA == node->fn_type);
412 return ((ipsec_sa_t *) (((char *) node) -
413 STRUCT_OFFSET_OF (ipsec_sa_t, node)));
418 * Function definition to backwalk a FIB node
420 static fib_node_back_walk_rc_t
421 ipsec_sa_back_walk (fib_node_t * node, fib_node_back_walk_ctx_t * ctx)
423 ipsec_sa_stack (ipsec_sa_from_fib_node (node));
425 return (FIB_NODE_BACK_WALK_CONTINUE);
429 * Virtual function table registered by MPLS GRE tunnels
430 * for participation in the FIB object graph.
432 const static fib_node_vft_t ipsec_sa_vft = {
433 .fnv_get = ipsec_sa_fib_node_get,
434 .fnv_last_lock = ipsec_sa_last_lock_gone,
435 .fnv_back_walk = ipsec_sa_back_walk,
438 /* force inclusion from application's main.c */
440 ipsec_sa_interface_init (vlib_main_t * vm)
442 fib_node_register_type (FIB_NODE_TYPE_IPSEC_SA, &ipsec_sa_vft);
447 VLIB_INIT_FUNCTION (ipsec_sa_interface_init);
450 * fd.io coding-style-patch-verification: ON
453 * eval: (c-set-style "gnu")