diff options
Diffstat (limited to 'src/vnet/ipsec/ipsec_sa.c')
| -rw-r--r-- | src/vnet/ipsec/ipsec_sa.c | 174 |
1 files changed, 174 insertions, 0 deletions
diff --git a/src/vnet/ipsec/ipsec_sa.c b/src/vnet/ipsec/ipsec_sa.c new file mode 100644 index 00000000000..a76197b9f50 --- /dev/null +++ b/src/vnet/ipsec/ipsec_sa.c @@ -0,0 +1,174 @@ +/* + * Copyright (c) 2015 Cisco and/or its affiliates. + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at: + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#include <vnet/ipsec/ipsec.h> + +static clib_error_t * +ipsec_call_add_del_callbacks (ipsec_main_t * im, ipsec_sa_t * sa, + u32 sa_index, int is_add) +{ + ipsec_ah_backend_t *ab; + ipsec_esp_backend_t *eb; + switch (sa->protocol) + { + case IPSEC_PROTOCOL_AH: + ab = pool_elt_at_index (im->ah_backends, im->ah_current_backend); + if (ab->add_del_sa_sess_cb) + return ab->add_del_sa_sess_cb (sa_index, is_add); + break; + case IPSEC_PROTOCOL_ESP: + eb = pool_elt_at_index (im->esp_backends, im->esp_current_backend); + if (eb->add_del_sa_sess_cb) + return eb->add_del_sa_sess_cb (sa_index, is_add); + break; + } + return 0; +} + +int +ipsec_add_del_sa (vlib_main_t * vm, ipsec_sa_t * new_sa, int is_add) +{ + ipsec_main_t *im = &ipsec_main; + ipsec_sa_t *sa = 0; + uword *p; + u32 sa_index; + clib_error_t *err; + + clib_warning ("id %u spi %u", new_sa->id, new_sa->spi); + + p = hash_get (im->sa_index_by_sa_id, new_sa->id); + if (p && is_add) + return VNET_API_ERROR_ENTRY_ALREADY_EXISTS; + if (!p && !is_add) + return VNET_API_ERROR_NO_SUCH_ENTRY; + + if (!is_add) /* delete */ + { + sa_index = p[0]; + sa = pool_elt_at_index (im->sad, sa_index); + if (ipsec_is_sa_used (sa_index)) + { + clib_warning ("sa_id %u used in policy", sa->id); + return VNET_API_ERROR_SYSCALL_ERROR_1; /* sa used in policy */ + } + hash_unset (im->sa_index_by_sa_id, sa->id); + err = ipsec_call_add_del_callbacks (im, sa, sa_index, 0); + if (err) + return VNET_API_ERROR_SYSCALL_ERROR_1; + pool_put (im->sad, sa); + } + else /* create new SA */ + { + pool_get (im->sad, sa); + clib_memcpy (sa, new_sa, sizeof (*sa)); + sa_index = sa - im->sad; + hash_set (im->sa_index_by_sa_id, sa->id, sa_index); + err = ipsec_call_add_del_callbacks (im, sa, sa_index, 1); + if (err) + return VNET_API_ERROR_SYSCALL_ERROR_1; + } + return 0; +} + +u8 +ipsec_is_sa_used (u32 sa_index) +{ + ipsec_main_t *im = &ipsec_main; + ipsec_spd_t *spd; + ipsec_policy_t *p; + ipsec_tunnel_if_t *t; + + /* *INDENT-OFF* */ + pool_foreach(spd, im->spds, ({ + pool_foreach(p, spd->policies, ({ + if (p->policy == IPSEC_POLICY_ACTION_PROTECT) + { + if (p->sa_index == sa_index) + return 1; + } + })); + })); + + pool_foreach(t, im->tunnel_interfaces, ({ + if (t->input_sa_index == sa_index) + return 1; + if (t->output_sa_index == sa_index) + return 1; + })); + /* *INDENT-ON* */ + + return 0; +} + +int +ipsec_set_sa_key (vlib_main_t * vm, ipsec_sa_t * sa_update) +{ + ipsec_main_t *im = &ipsec_main; + uword *p; + u32 sa_index; + ipsec_sa_t *sa = 0; + clib_error_t *err; + + p = hash_get (im->sa_index_by_sa_id, sa_update->id); + if (!p) + return VNET_API_ERROR_SYSCALL_ERROR_1; /* no such sa-id */ + + sa_index = p[0]; + sa = pool_elt_at_index (im->sad, sa_index); + + /* new crypto key */ + if (0 < sa_update->crypto_key_len) + { + clib_memcpy (sa->crypto_key, sa_update->crypto_key, + sa_update->crypto_key_len); + sa->crypto_key_len = sa_update->crypto_key_len; + } + + /* new integ key */ + if (0 < sa_update->integ_key_len) + { + clib_memcpy (sa->integ_key, sa_update->integ_key, + sa_update->integ_key_len); + sa->integ_key_len = sa_update->integ_key_len; + } + + if (0 < sa_update->crypto_key_len || 0 < sa_update->integ_key_len) + { + err = ipsec_call_add_del_callbacks (im, sa, sa_index, 0); + if (err) + return VNET_API_ERROR_SYSCALL_ERROR_1; + } + + return 0; +} + +u32 +ipsec_get_sa_index_by_sa_id (u32 sa_id) +{ + ipsec_main_t *im = &ipsec_main; + uword *p = hash_get (im->sa_index_by_sa_id, sa_id); + if (!p) + return ~0; + + return p[0]; +} + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ |