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/fib/fib_table.h>
21 * SA packet & bytes counters
23 vlib_combined_counter_main_t ipsec_sa_counters = {
25 .stat_segment_name = "/net/ipsec/sa",
30 ipsec_call_add_del_callbacks (ipsec_main_t * im, ipsec_sa_t * sa,
31 u32 sa_index, int is_add)
33 ipsec_ah_backend_t *ab;
34 ipsec_esp_backend_t *eb;
37 case IPSEC_PROTOCOL_AH:
38 ab = pool_elt_at_index (im->ah_backends, im->ah_current_backend);
39 if (ab->add_del_sa_sess_cb)
40 return ab->add_del_sa_sess_cb (sa_index, is_add);
42 case IPSEC_PROTOCOL_ESP:
43 eb = pool_elt_at_index (im->esp_backends, im->esp_current_backend);
44 if (eb->add_del_sa_sess_cb)
45 return eb->add_del_sa_sess_cb (sa_index, is_add);
52 ipsec_mk_key (ipsec_key_t * key, const u8 * data, u8 len)
54 memset (key, 0, sizeof (*key));
56 if (len > sizeof (key->data))
57 key->len = sizeof (key->data);
61 memcpy (key->data, data, key->len);
65 * 'stack' (resolve the recursion for) the SA tunnel destination
68 ipsec_sa_stack (ipsec_sa_t * sa)
70 ipsec_main_t *im = &ipsec_main;
71 fib_forward_chain_type_t fct;
72 dpo_id_t tmp = DPO_INVALID;
74 fct = fib_forw_chain_type_from_fib_proto ((sa->is_tunnel_ip6 ?
78 fib_entry_contribute_forwarding (sa->fib_entry_index, fct, &tmp);
80 dpo_stack_from_node ((sa->is_tunnel_ip6 ?
81 im->ah6_encrypt_node_index :
82 im->ah4_encrypt_node_index),
83 &sa->dpo[IPSEC_PROTOCOL_AH], &tmp);
84 dpo_stack_from_node ((sa->is_tunnel_ip6 ?
85 im->esp6_encrypt_node_index :
86 im->esp4_encrypt_node_index),
87 &sa->dpo[IPSEC_PROTOCOL_ESP], &tmp);
92 ipsec_sa_set_crypto_alg (ipsec_sa_t * sa, ipsec_crypto_alg_t crypto_alg)
94 ipsec_main_t *im = &ipsec_main;
95 sa->crypto_alg = crypto_alg;
96 sa->crypto_iv_size = im->crypto_algs[crypto_alg].iv_size;
97 sa->crypto_block_size = im->crypto_algs[crypto_alg].block_size;
98 sa->crypto_enc_op_type = im->crypto_algs[crypto_alg].enc_op_type;
99 sa->crypto_dec_op_type = im->crypto_algs[crypto_alg].dec_op_type;
103 ipsec_sa_set_integ_alg (ipsec_sa_t * sa, ipsec_integ_alg_t integ_alg)
105 ipsec_main_t *im = &ipsec_main;
106 sa->integ_alg = integ_alg;
107 sa->integ_trunc_size = im->integ_algs[integ_alg].trunc_size;
108 sa->integ_op_type = im->integ_algs[integ_alg].op_type;
112 ipsec_sa_add (u32 id,
114 ipsec_protocol_t proto,
115 ipsec_crypto_alg_t crypto_alg,
116 const ipsec_key_t * ck,
117 ipsec_integ_alg_t integ_alg,
118 const ipsec_key_t * ik,
119 ipsec_sa_flags_t flags,
121 const ip46_address_t * tun_src,
122 const ip46_address_t * tun_dst, u32 * sa_out_index)
124 ipsec_main_t *im = &ipsec_main;
130 p = hash_get (im->sa_index_by_sa_id, id);
132 return VNET_API_ERROR_ENTRY_ALREADY_EXISTS;
134 pool_get_zero (im->sad, sa);
136 fib_node_init (&sa->node, FIB_NODE_TYPE_IPSEC_SA);
137 sa_index = sa - im->sad;
139 vlib_validate_combined_counter (&ipsec_sa_counters, sa_index);
140 vlib_zero_combined_counter (&ipsec_sa_counters, sa_index);
144 sa->stat_index = sa_index;
145 sa->protocol = proto;
146 ipsec_sa_set_crypto_alg (sa, crypto_alg);
147 clib_memcpy (&sa->crypto_key, ck, sizeof (sa->crypto_key));
148 ipsec_sa_set_integ_alg (sa, integ_alg);
149 clib_memcpy (&sa->integ_key, ik, sizeof (sa->integ_key));
150 ip46_address_copy (&sa->tunnel_src_addr, tun_src);
151 ip46_address_copy (&sa->tunnel_dst_addr, tun_dst);
153 if (flags & IPSEC_SA_FLAG_USE_EXTENDED_SEQ_NUM)
155 if (flags & IPSEC_SA_FLAG_USE_ANTI_REPLAY)
156 sa->use_anti_replay = 1;
157 if (flags & IPSEC_SA_FLAG_IS_TUNNEL)
159 if (flags & IPSEC_SA_FLAG_IS_TUNNEL_V6)
160 sa->is_tunnel_ip6 = 1;
161 if (flags & IPSEC_SA_FLAG_UDP_ENCAP)
164 err = ipsec_check_support_cb (im, sa);
167 clib_warning ("%s", err->what);
168 pool_put (im->sad, sa);
169 return VNET_API_ERROR_UNIMPLEMENTED;
172 err = ipsec_call_add_del_callbacks (im, sa, sa_index, 1);
175 pool_put (im->sad, sa);
176 return VNET_API_ERROR_SYSCALL_ERROR_1;
181 fib_protocol_t fproto = (sa->is_tunnel_ip6 ?
182 FIB_PROTOCOL_IP6 : FIB_PROTOCOL_IP4);
184 .fp_addr = sa->tunnel_dst_addr,
185 .fp_len = (sa->is_tunnel_ip6 ? 128 : 32),
188 sa->tx_fib_index = fib_table_find (fproto, tx_table_id);
189 if (sa->tx_fib_index == ~((u32) 0))
191 pool_put (im->sad, sa);
192 return VNET_API_ERROR_NO_SUCH_FIB;
195 sa->fib_entry_index = fib_table_entry_special_add (sa->tx_fib_index,
198 FIB_ENTRY_FLAG_NONE);
199 sa->sibling = fib_entry_child_add (sa->fib_entry_index,
200 FIB_NODE_TYPE_IPSEC_SA, sa_index);
203 hash_set (im->sa_index_by_sa_id, sa->id, sa_index);
206 *sa_out_index = sa_index;
212 ipsec_sa_del (u32 id)
214 ipsec_main_t *im = &ipsec_main;
220 p = hash_get (im->sa_index_by_sa_id, id);
223 return VNET_API_ERROR_NO_SUCH_ENTRY;
226 sa = pool_elt_at_index (im->sad, sa_index);
227 if (ipsec_is_sa_used (sa_index))
229 clib_warning ("sa_id %u used in policy", sa->id);
230 /* sa used in policy */
231 return VNET_API_ERROR_SYSCALL_ERROR_1;
233 hash_unset (im->sa_index_by_sa_id, sa->id);
234 err = ipsec_call_add_del_callbacks (im, sa, sa_index, 0);
236 return VNET_API_ERROR_SYSCALL_ERROR_1;
239 fib_entry_child_remove (sa->fib_entry_index, sa->sibling);
240 fib_table_entry_special_remove
242 fib_entry_get_prefix (sa->fib_entry_index), FIB_SOURCE_RR);
243 dpo_reset (&sa->dpo[IPSEC_PROTOCOL_AH]);
244 dpo_reset (&sa->dpo[IPSEC_PROTOCOL_ESP]);
246 pool_put (im->sad, sa);
251 ipsec_is_sa_used (u32 sa_index)
253 ipsec_main_t *im = &ipsec_main;
254 ipsec_tunnel_if_t *t;
258 pool_foreach(p, im->policies, ({
259 if (p->policy == IPSEC_POLICY_ACTION_PROTECT)
261 if (p->sa_index == sa_index)
266 pool_foreach(t, im->tunnel_interfaces, ({
267 if (t->input_sa_index == sa_index)
269 if (t->output_sa_index == sa_index)
278 ipsec_set_sa_key (u32 id, const ipsec_key_t * ck, const ipsec_key_t * ik)
280 ipsec_main_t *im = &ipsec_main;
286 p = hash_get (im->sa_index_by_sa_id, id);
288 return VNET_API_ERROR_SYSCALL_ERROR_1; /* no such sa-id */
291 sa = pool_elt_at_index (im->sad, sa_index);
296 clib_memcpy (&sa->crypto_key, ck, sizeof (sa->crypto_key));
302 clib_memcpy (&sa->integ_key, 0, sizeof (sa->integ_key));
307 err = ipsec_call_add_del_callbacks (im, sa, sa_index, 0);
310 clib_error_free (err);
311 return VNET_API_ERROR_SYSCALL_ERROR_1;
319 ipsec_get_sa_index_by_sa_id (u32 sa_id)
321 ipsec_main_t *im = &ipsec_main;
322 uword *p = hash_get (im->sa_index_by_sa_id, sa_id);
330 ipsec_sa_walk (ipsec_sa_walk_cb_t cb, void *ctx)
332 ipsec_main_t *im = &ipsec_main;
336 pool_foreach (sa, im->sad,
338 if (WALK_CONTINUE != cb(sa, ctx))
345 * Function definition to get a FIB node from its index
348 ipsec_sa_fib_node_get (fib_node_index_t index)
354 sa = pool_elt_at_index (im->sad, index);
360 * Function definition to inform the FIB node that its last lock has gone.
363 ipsec_sa_last_lock_gone (fib_node_t * node)
366 * The ipsec SA is a root of the graph. As such
367 * it never has children and thus is never locked.
373 ipsec_sa_from_fib_node (fib_node_t * node)
375 ASSERT (FIB_NODE_TYPE_IPSEC_SA == node->fn_type);
376 return ((ipsec_sa_t *) (((char *) node) -
377 STRUCT_OFFSET_OF (ipsec_sa_t, node)));
382 * Function definition to backwalk a FIB node
384 static fib_node_back_walk_rc_t
385 ipsec_sa_back_walk (fib_node_t * node, fib_node_back_walk_ctx_t * ctx)
387 ipsec_sa_stack (ipsec_sa_from_fib_node (node));
389 return (FIB_NODE_BACK_WALK_CONTINUE);
393 * Virtual function table registered by MPLS GRE tunnels
394 * for participation in the FIB object graph.
396 const static fib_node_vft_t ipsec_sa_vft = {
397 .fnv_get = ipsec_sa_fib_node_get,
398 .fnv_last_lock = ipsec_sa_last_lock_gone,
399 .fnv_back_walk = ipsec_sa_back_walk,
402 /* force inclusion from application's main.c */
404 ipsec_sa_interface_init (vlib_main_t * vm)
406 fib_node_register_type (FIB_NODE_TYPE_IPSEC_SA, &ipsec_sa_vft);
411 VLIB_INIT_FUNCTION (ipsec_sa_interface_init);
414 * fd.io coding-style-patch-verification: ON
417 * eval: (c-set-style "gnu")