| /* |
| * decap.c : IPSec tunnel support |
| * |
| * 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/vnet.h> |
| #include <vnet/api_errno.h> |
| #include <vnet/ip/ip.h> |
| #include <vnet/interface.h> |
| |
| #include <vnet/ipsec/ipsec.h> |
| #include <vnet/ipsec/ikev2.h> |
| #include <vnet/ipsec/esp.h> |
| |
| 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]; |
| } |
| |
| int |
| ipsec_set_interface_spd (vlib_main_t * vm, u32 sw_if_index, u32 spd_id, |
| int is_add) |
| { |
| ipsec_main_t *im = &ipsec_main; |
| ip4_ipsec_config_t config; |
| |
| u32 spd_index; |
| uword *p; |
| |
| p = hash_get (im->spd_index_by_spd_id, spd_id); |
| if (!p) |
| return VNET_API_ERROR_SYSCALL_ERROR_1; /* no such spd-id */ |
| |
| spd_index = p[0]; |
| |
| p = hash_get (im->spd_index_by_sw_if_index, sw_if_index); |
| if (p && is_add) |
| return VNET_API_ERROR_SYSCALL_ERROR_1; /* spd already assigned */ |
| |
| if (is_add) |
| { |
| hash_set (im->spd_index_by_sw_if_index, sw_if_index, spd_index); |
| } |
| else |
| { |
| hash_unset (im->spd_index_by_sw_if_index, sw_if_index); |
| } |
| |
| clib_warning ("sw_if_index %u spd_id %u spd_index %u", |
| sw_if_index, spd_id, spd_index); |
| |
| /* enable IPsec on TX */ |
| vnet_feature_enable_disable ("ip4-output", "ipsec-output-ip4", sw_if_index, |
| is_add, 0, 0); |
| vnet_feature_enable_disable ("ip6-output", "ipsec-output-ip6", sw_if_index, |
| is_add, 0, 0); |
| |
| /* enable IPsec on RX */ |
| vnet_feature_enable_disable ("ip4-unicast", "ipsec-input-ip4", sw_if_index, |
| is_add, &config, sizeof (config)); |
| vnet_feature_enable_disable ("ip6-unicast", "ipsec-input-ip6", sw_if_index, |
| is_add, &config, sizeof (config)); |
| |
| return 0; |
| } |
| |
| int |
| ipsec_add_del_spd (vlib_main_t * vm, u32 spd_id, int is_add) |
| { |
| ipsec_main_t *im = &ipsec_main; |
| ipsec_spd_t *spd = 0; |
| uword *p; |
| u32 spd_index, k, v; |
| |
| p = hash_get (im->spd_index_by_spd_id, spd_id); |
| if (p && is_add) |
| return VNET_API_ERROR_INVALID_VALUE; |
| if (!p && !is_add) |
| return VNET_API_ERROR_INVALID_VALUE; |
| |
| if (!is_add) /* delete */ |
| { |
| spd_index = p[0]; |
| spd = pool_elt_at_index (im->spds, spd_index); |
| if (!spd) |
| return VNET_API_ERROR_INVALID_VALUE; |
| /* *INDENT-OFF* */ |
| hash_foreach (k, v, im->spd_index_by_sw_if_index, ({ |
| if (v == spd_index) |
| ipsec_set_interface_spd(vm, k, spd_id, 0); |
| })); |
| /* *INDENT-ON* */ |
| hash_unset (im->spd_index_by_spd_id, spd_id); |
| pool_free (spd->policies); |
| vec_free (spd->ipv4_outbound_policies); |
| vec_free (spd->ipv6_outbound_policies); |
| vec_free (spd->ipv4_inbound_protect_policy_indices); |
| vec_free (spd->ipv4_inbound_policy_discard_and_bypass_indices); |
| pool_put (im->spds, spd); |
| } |
| else /* create new SPD */ |
| { |
| pool_get (im->spds, spd); |
| memset (spd, 0, sizeof (*spd)); |
| spd_index = spd - im->spds; |
| spd->id = spd_id; |
| hash_set (im->spd_index_by_spd_id, spd_id, spd_index); |
| } |
| return 0; |
| } |
| |
| static int |
| ipsec_spd_entry_sort (void *a1, void *a2) |
| { |
| ipsec_main_t *im = &ipsec_main; |
| u32 *id1 = a1; |
| u32 *id2 = a2; |
| ipsec_spd_t *spd; |
| ipsec_policy_t *p1, *p2; |
| |
| /* *INDENT-OFF* */ |
| pool_foreach (spd, im->spds, ({ |
| p1 = pool_elt_at_index(spd->policies, *id1); |
| p2 = pool_elt_at_index(spd->policies, *id2); |
| if (p1 && p2) |
| return p2->priority - p1->priority; |
| })); |
| /* *INDENT-ON* */ |
| |
| return 0; |
| } |
| |
| int |
| ipsec_add_del_policy (vlib_main_t * vm, ipsec_policy_t * policy, int is_add) |
| { |
| ipsec_main_t *im = &ipsec_main; |
| ipsec_spd_t *spd = 0; |
| ipsec_policy_t *vp; |
| uword *p; |
| u32 spd_index; |
| |
| clib_warning ("policy-id %u priority %d is_outbound %u", policy->id, |
| policy->priority, policy->is_outbound); |
| |
| if (policy->policy == IPSEC_POLICY_ACTION_PROTECT) |
| { |
| p = hash_get (im->sa_index_by_sa_id, policy->sa_id); |
| if (!p) |
| return VNET_API_ERROR_SYSCALL_ERROR_1; |
| policy->sa_index = p[0]; |
| } |
| |
| p = hash_get (im->spd_index_by_spd_id, policy->id); |
| |
| if (!p) |
| return VNET_API_ERROR_SYSCALL_ERROR_1; |
| |
| spd_index = p[0]; |
| spd = pool_elt_at_index (im->spds, spd_index); |
| if (!spd) |
| return VNET_API_ERROR_SYSCALL_ERROR_1; |
| |
| if (is_add) |
| { |
| u32 policy_index; |
| |
| pool_get (spd->policies, vp); |
| clib_memcpy (vp, policy, sizeof (*vp)); |
| policy_index = vp - spd->policies; |
| |
| if (policy->is_outbound) |
| { |
| if (policy->is_ipv6) |
| { |
| vec_add1 (spd->ipv6_outbound_policies, policy_index); |
| clib_memcpy (vp, policy, sizeof (ipsec_policy_t)); |
| vec_sort_with_function (spd->ipv6_outbound_policies, |
| ipsec_spd_entry_sort); |
| } |
| else |
| { |
| vec_add1 (spd->ipv4_outbound_policies, policy_index); |
| clib_memcpy (vp, policy, sizeof (ipsec_policy_t)); |
| vec_sort_with_function (spd->ipv4_outbound_policies, |
| ipsec_spd_entry_sort); |
| } |
| } |
| else |
| { |
| if (policy->is_ipv6) |
| { |
| if (policy->policy == IPSEC_POLICY_ACTION_PROTECT) |
| { |
| vec_add1 (spd->ipv6_inbound_protect_policy_indices, |
| policy_index); |
| clib_memcpy (vp, policy, sizeof (ipsec_policy_t)); |
| vec_sort_with_function |
| (spd->ipv6_inbound_protect_policy_indices, |
| ipsec_spd_entry_sort); |
| } |
| else |
| { |
| vec_add1 |
| (spd->ipv6_inbound_policy_discard_and_bypass_indices, |
| policy_index); |
| clib_memcpy (vp, policy, sizeof (ipsec_policy_t)); |
| vec_sort_with_function |
| (spd->ipv6_inbound_policy_discard_and_bypass_indices, |
| ipsec_spd_entry_sort); |
| } |
| } |
| else |
| { |
| if (policy->policy == IPSEC_POLICY_ACTION_PROTECT) |
| { |
| vec_add1 (spd->ipv4_inbound_protect_policy_indices, |
| policy_index); |
| clib_memcpy (vp, policy, sizeof (ipsec_policy_t)); |
| vec_sort_with_function |
| (spd->ipv4_inbound_protect_policy_indices, |
| ipsec_spd_entry_sort); |
| } |
| else |
| { |
| vec_add1 |
| (spd->ipv4_inbound_policy_discard_and_bypass_indices, |
| policy_index); |
| clib_memcpy (vp, policy, sizeof (ipsec_policy_t)); |
| vec_sort_with_function |
| (spd->ipv4_inbound_policy_discard_and_bypass_indices, |
| ipsec_spd_entry_sort); |
| } |
| } |
| } |
| |
| } |
| else |
| { |
| u32 i, j; |
| /* *INDENT-OFF* */ |
| pool_foreach_index(i, spd->policies, ({ |
| vp = pool_elt_at_index(spd->policies, i); |
| if (vp->priority != policy->priority) |
| continue; |
| if (vp->is_outbound != policy->is_outbound) |
| continue; |
| if (vp->policy != policy->policy) |
| continue; |
| if (vp->sa_id != policy->sa_id) |
| continue; |
| if (vp->protocol != policy->protocol) |
| continue; |
| if (vp->lport.start != policy->lport.start) |
| continue; |
| if (vp->lport.stop != policy->lport.stop) |
| continue; |
| if (vp->rport.start != policy->rport.start) |
| continue; |
| if (vp->rport.stop != policy->rport.stop) |
| continue; |
| if (vp->is_ipv6 != policy->is_ipv6) |
| continue; |
| if (policy->is_ipv6) |
| { |
| if (vp->laddr.start.ip6.as_u64[0] != policy->laddr.start.ip6.as_u64[0]) |
| continue; |
| if (vp->laddr.start.ip6.as_u64[1] != policy->laddr.start.ip6.as_u64[1]) |
| continue; |
| if (vp->laddr.stop.ip6.as_u64[0] != policy->laddr.stop.ip6.as_u64[0]) |
| continue; |
| if (vp->laddr.stop.ip6.as_u64[1] != policy->laddr.stop.ip6.as_u64[1]) |
| continue; |
| if (vp->raddr.start.ip6.as_u64[0] != policy->raddr.start.ip6.as_u64[0]) |
| continue; |
| if (vp->raddr.start.ip6.as_u64[1] != policy->raddr.start.ip6.as_u64[1]) |
| continue; |
| if (vp->raddr.stop.ip6.as_u64[0] != policy->raddr.stop.ip6.as_u64[0]) |
| continue; |
| if (vp->laddr.stop.ip6.as_u64[1] != policy->laddr.stop.ip6.as_u64[1]) |
| continue; |
| if (policy->is_outbound) |
| { |
| vec_foreach_index(j, spd->ipv6_outbound_policies) { |
| if (vec_elt(spd->ipv6_outbound_policies, j) == i) { |
| vec_del1 (spd->ipv6_outbound_policies, j); |
| break; |
| } |
| } |
| } |
| else |
| { |
| if (policy->policy == IPSEC_POLICY_ACTION_PROTECT) |
| { |
| vec_foreach_index(j, spd->ipv6_inbound_protect_policy_indices) { |
| if (vec_elt(spd->ipv6_inbound_protect_policy_indices, j) == i) { |
| vec_del1 (spd->ipv6_inbound_protect_policy_indices, j); |
| break; |
| } |
| } |
| } |
| else |
| { |
| vec_foreach_index(j, spd->ipv6_inbound_policy_discard_and_bypass_indices) { |
| if (vec_elt(spd->ipv6_inbound_policy_discard_and_bypass_indices, j) == i) { |
| vec_del1 (spd->ipv6_inbound_policy_discard_and_bypass_indices, j); |
| break; |
| } |
| } |
| } |
| } |
| } |
| else |
| { |
| if (vp->laddr.start.ip4.as_u32 != policy->laddr.start.ip4.as_u32) |
| continue; |
| if (vp->laddr.stop.ip4.as_u32 != policy->laddr.stop.ip4.as_u32) |
| continue; |
| if (vp->raddr.start.ip4.as_u32 != policy->raddr.start.ip4.as_u32) |
| continue; |
| if (vp->raddr.stop.ip4.as_u32 != policy->raddr.stop.ip4.as_u32) |
| continue; |
| if (policy->is_outbound) |
| { |
| vec_foreach_index(j, spd->ipv4_outbound_policies) { |
| if (vec_elt(spd->ipv4_outbound_policies, j) == i) { |
| vec_del1 (spd->ipv4_outbound_policies, j); |
| break; |
| } |
| } |
| } |
| else |
| { |
| if (policy->policy == IPSEC_POLICY_ACTION_PROTECT) |
| { |
| vec_foreach_index(j, spd->ipv4_inbound_protect_policy_indices) { |
| if (vec_elt(spd->ipv4_inbound_protect_policy_indices, j) == i) { |
| vec_del1 (spd->ipv4_inbound_protect_policy_indices, j); |
| break; |
| } |
| } |
| } |
| else |
| { |
| vec_foreach_index(j, spd->ipv4_inbound_policy_discard_and_bypass_indices) { |
| if (vec_elt(spd->ipv4_inbound_policy_discard_and_bypass_indices, j) == i) { |
| vec_del1 (spd->ipv4_inbound_policy_discard_and_bypass_indices, j); |
| break; |
| } |
| } |
| } |
| } |
| pool_put (spd->policies, vp); |
| break; |
| } |
| })); |
| /* *INDENT-ON* */ |
| } |
| |
| return 0; |
| } |
| |
| static 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_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_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_SYSCALL_ERROR_1; /* already exists */ |
| if (!p && !is_add) |
| return VNET_API_ERROR_SYSCALL_ERROR_1; |
| |
| 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); |
| if (im->cb.add_del_sa_sess_cb && |
| im->cb.add_del_sa_sess_cb (sa_index, is_add) < 0) |
| 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); |
| if (im->cb.add_del_sa_sess_cb && |
| im->cb.add_del_sa_sess_cb (sa_index, is_add) < 0) |
| return VNET_API_ERROR_SYSCALL_ERROR_1; |
| } |
| 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; |
| |
| 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 (sa->crypto_key_len + sa->integ_key_len > 0) |
| { |
| if (im->cb.add_del_sa_sess_cb && |
| im->cb.add_del_sa_sess_cb (sa_index, 0) < 0) |
| return VNET_API_ERROR_SYSCALL_ERROR_1; |
| } |
| |
| return 0; |
| } |
| |
| static void |
| ipsec_rand_seed (void) |
| { |
| struct |
| { |
| time_t time; |
| pid_t pid; |
| void *p; |
| } seed_data; |
| |
| seed_data.time = time (NULL); |
| seed_data.pid = getpid (); |
| seed_data.p = (void *) &seed_data; |
| |
| RAND_seed ((const void *) &seed_data, sizeof (seed_data)); |
| } |
| |
| static clib_error_t * |
| ipsec_check_support (ipsec_sa_t * sa) |
| { |
| if (sa->crypto_alg == IPSEC_CRYPTO_ALG_AES_GCM_128) |
| return clib_error_return (0, "unsupported aes-gcm-128 crypto-alg"); |
| if (sa->integ_alg == IPSEC_INTEG_ALG_NONE) |
| return clib_error_return (0, "unsupported none integ-alg"); |
| if (sa->integ_alg == IPSEC_INTEG_ALG_AES_GCM_128) |
| return clib_error_return (0, "unsupported aes-gcm-128 integ-alg"); |
| |
| return 0; |
| } |
| |
| static clib_error_t * |
| ipsec_init (vlib_main_t * vm) |
| { |
| clib_error_t *error; |
| ipsec_main_t *im = &ipsec_main; |
| vlib_thread_main_t *tm = vlib_get_thread_main (); |
| vlib_node_t *node; |
| |
| ipsec_rand_seed (); |
| |
| memset (im, 0, sizeof (im[0])); |
| |
| im->vnet_main = vnet_get_main (); |
| im->vlib_main = vm; |
| |
| im->spd_index_by_spd_id = hash_create (0, sizeof (uword)); |
| im->sa_index_by_sa_id = hash_create (0, sizeof (uword)); |
| im->spd_index_by_sw_if_index = hash_create (0, sizeof (uword)); |
| |
| vec_validate_aligned (im->empty_buffers, tm->n_vlib_mains - 1, |
| CLIB_CACHE_LINE_BYTES); |
| |
| node = vlib_get_node_by_name (vm, (u8 *) "error-drop"); |
| ASSERT (node); |
| im->error_drop_node_index = node->index; |
| |
| node = vlib_get_node_by_name (vm, (u8 *) "esp-encrypt"); |
| ASSERT (node); |
| im->esp_encrypt_node_index = node->index; |
| |
| node = vlib_get_node_by_name (vm, (u8 *) "esp-decrypt"); |
| ASSERT (node); |
| im->esp_decrypt_node_index = node->index; |
| |
| im->esp_encrypt_next_index = IPSEC_OUTPUT_NEXT_ESP_ENCRYPT; |
| im->esp_decrypt_next_index = IPSEC_INPUT_NEXT_ESP_DECRYPT; |
| |
| im->cb.check_support_cb = ipsec_check_support; |
| |
| if ((error = vlib_call_init_function (vm, ipsec_cli_init))) |
| return error; |
| |
| if ((error = vlib_call_init_function (vm, ipsec_tunnel_if_init))) |
| return error; |
| |
| esp_init (); |
| |
| if ((error = ikev2_init (vm))) |
| return error; |
| |
| return 0; |
| } |
| |
| VLIB_INIT_FUNCTION (ipsec_init); |
| |
| /* |
| * fd.io coding-style-patch-verification: ON |
| * |
| * Local Variables: |
| * eval: (c-set-style "gnu") |
| * End: |
| */ |