blob: 43997bc86c186a796c94ac606b60282d95f6028b [file] [log] [blame]
/*
* ipsec_if.c : IPSec interface 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/fib/fib.h>
#include <vnet/udp/udp.h>
#include <vnet/adj/adj_midchain.h>
#include <vnet/ipsec/ipsec.h>
#include <vnet/ipsec/esp.h>
void vl_api_rpc_call_main_thread (void *fp, u8 * data, u32 data_length);
static u8 *
format_ipsec_name (u8 * s, va_list * args)
{
u32 dev_instance = va_arg (*args, u32);
ipsec_main_t *im = &ipsec_main;
ipsec_tunnel_if_t *t = im->tunnel_interfaces + dev_instance;
return format (s, "ipsec%d", t->show_instance);
}
/* Statistics (not really errors) */
#define foreach_ipsec_if_tx_error \
_(TX, "good packets transmitted")
static void
ipsec_if_tunnel_stack (adj_index_t ai)
{
ipsec_main_t *ipm = &ipsec_main;
ipsec_tunnel_if_t *it;
ip_adjacency_t *adj;
u32 sw_if_index;
adj = adj_get (ai);
sw_if_index = adj->rewrite_header.sw_if_index;
if ((vec_len (ipm->ipsec_if_by_sw_if_index) <= sw_if_index) ||
(~0 == ipm->ipsec_if_by_sw_if_index[sw_if_index]))
return;
it = pool_elt_at_index (ipm->tunnel_interfaces,
ipm->ipsec_if_by_sw_if_index[sw_if_index]);
if (!vnet_hw_interface_is_link_up (vnet_get_main (), it->hw_if_index))
{
adj_midchain_delegate_unstack (ai);
}
else
{
ipsec_sa_t *sa;
sa = ipsec_sa_get (it->output_sa_index);
/* *INDENT-OFF* */
fib_prefix_t pfx = {
.fp_addr = sa->tunnel_dst_addr,
.fp_len = (ipsec_sa_is_set_IS_TUNNEL_V6(sa) ? 128 : 32),
.fp_proto = (ipsec_sa_is_set_IS_TUNNEL_V6(sa) ?
FIB_PROTOCOL_IP6 :
FIB_PROTOCOL_IP4),
};
/* *INDENT-ON* */
adj_midchain_delegate_stack (ai, sa->tx_fib_index, &pfx);
}
}
/**
* @brief Call back when restacking all adjacencies on a IPSec interface
*/
static adj_walk_rc_t
ipsec_if_adj_walk_cb (adj_index_t ai, void *ctx)
{
ipsec_if_tunnel_stack (ai);
return (ADJ_WALK_RC_CONTINUE);
}
static void
ipsec_if_tunnel_restack (ipsec_tunnel_if_t * it)
{
fib_protocol_t proto;
/*
* walk all the adjacencies on the IPSec interface and restack them
*/
FOR_EACH_FIB_IP_PROTOCOL (proto)
{
adj_nbr_walk (it->sw_if_index, proto, ipsec_if_adj_walk_cb, NULL);
}
}
static clib_error_t *
ipsec_admin_up_down_function (vnet_main_t * vnm, u32 hw_if_index, u32 flags)
{
ipsec_main_t *im = &ipsec_main;
clib_error_t *err = 0;
ipsec_tunnel_if_t *t;
vnet_hw_interface_t *hi;
ipsec_sa_t *sa;
hi = vnet_get_hw_interface (vnm, hw_if_index);
t = pool_elt_at_index (im->tunnel_interfaces, hi->hw_instance);
t->flags = flags;
if (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP)
{
sa = pool_elt_at_index (im->sad, t->input_sa_index);
err = ipsec_check_support_cb (im, sa);
if (err)
return err;
err = ipsec_add_del_sa_sess_cb (im, t->input_sa_index, 1);
if (err)
return err;
sa = pool_elt_at_index (im->sad, t->output_sa_index);
err = ipsec_check_support_cb (im, sa);
if (err)
return err;
err = ipsec_add_del_sa_sess_cb (im, t->output_sa_index, 1);
if (err)
return err;
vnet_hw_interface_set_flags (vnm, hw_if_index,
VNET_HW_INTERFACE_FLAG_LINK_UP);
}
else
{
vnet_hw_interface_set_flags (vnm, hw_if_index, 0 /* down */ );
sa = pool_elt_at_index (im->sad, t->input_sa_index);
err = ipsec_add_del_sa_sess_cb (im, t->input_sa_index, 0);
if (err)
return err;
sa = pool_elt_at_index (im->sad, t->output_sa_index);
err = ipsec_add_del_sa_sess_cb (im, t->output_sa_index, 0);
if (err)
return err;
}
ipsec_if_tunnel_restack (t);
return (NULL);
}
static u8 *
ipsec_if_build_rewrite (vnet_main_t * vnm,
u32 sw_if_index,
vnet_link_t link_type, const void *dst_address)
{
return (NULL);
}
static void
ipsec_if_update_adj (vnet_main_t * vnm, u32 sw_if_index, adj_index_t ai)
{
adj_nbr_midchain_update_rewrite
(ai, NULL, NULL, ADJ_FLAG_MIDCHAIN_IP_STACK,
ipsec_if_build_rewrite (vnm, sw_if_index, adj_get_link_type (ai), NULL));
ipsec_if_tunnel_stack (ai);
}
/* *INDENT-OFF* */
VNET_DEVICE_CLASS (ipsec_device_class) =
{
.name = "IPSec",
.format_device_name = format_ipsec_name,
.admin_up_down_function = ipsec_admin_up_down_function,
};
/* *INDENT-ON* */
/* *INDENT-OFF* */
VNET_HW_INTERFACE_CLASS (ipsec_hw_class) =
{
.name = "IPSec",
.build_rewrite = default_build_rewrite,
.update_adjacency = ipsec_if_update_adj,
.flags = VNET_HW_INTERFACE_CLASS_FLAG_P2P,
};
/* *INDENT-ON* */
static int
ipsec_add_del_tunnel_if_rpc_callback (ipsec_add_del_tunnel_args_t * a)
{
vnet_main_t *vnm = vnet_get_main ();
ASSERT (vlib_get_thread_index () == 0);
return ipsec_add_del_tunnel_if_internal (vnm, a, NULL);
}
int
ipsec_add_del_tunnel_if (ipsec_add_del_tunnel_args_t * args)
{
vl_api_rpc_call_main_thread (ipsec_add_del_tunnel_if_rpc_callback,
(u8 *) args, sizeof (*args));
return 0;
}
static u32
ipsec_tun_mk_input_sa_id (u32 ti)
{
return (0x80000000 | ti);
}
static u32
ipsec_tun_mk_output_sa_id (u32 ti)
{
return (0xc0000000 | ti);
}
static void
ipsec_tunnel_feature_set (ipsec_main_t * im, ipsec_tunnel_if_t * t, u8 enable)
{
u8 arc;
u32 esp4_feature_index, esp6_feature_index;
ipsec_sa_t *sa;
sa = ipsec_sa_get (t->output_sa_index);
if (sa->crypto_alg == IPSEC_CRYPTO_ALG_NONE)
{
esp4_feature_index = im->esp4_no_crypto_tun_feature_index;
esp6_feature_index = im->esp6_no_crypto_tun_feature_index;
}
else
{
esp4_feature_index = im->esp4_encrypt_tun_feature_index;
esp6_feature_index = im->esp6_encrypt_tun_feature_index;
}
arc = vnet_get_feature_arc_index ("ip4-output");
vnet_feature_enable_disable_with_index (arc, esp4_feature_index,
t->sw_if_index, enable,
&t->output_sa_index,
sizeof (t->output_sa_index));
arc = vnet_get_feature_arc_index ("ip6-output");
vnet_feature_enable_disable_with_index (arc, esp6_feature_index,
t->sw_if_index, enable,
&t->output_sa_index,
sizeof (t->output_sa_index));
}
int
ipsec_add_del_tunnel_if_internal (vnet_main_t * vnm,
ipsec_add_del_tunnel_args_t * args,
u32 * sw_if_index)
{
ipsec_tunnel_if_t *t;
ipsec_main_t *im = &ipsec_main;
vnet_hw_interface_t *hi = NULL;
u32 hw_if_index = ~0;
uword *p;
u32 dev_instance;
ipsec_key_t crypto_key, integ_key;
ipsec_sa_flags_t flags;
int rv;
int is_ip6 = args->is_ip6;
ipsec4_tunnel_key_t key4;
ipsec6_tunnel_key_t key6;
if (!is_ip6)
{
key4.remote_ip.as_u32 = args->remote_ip.ip4.as_u32;
key4.spi = clib_host_to_net_u32 (args->remote_spi);
p = hash_get (im->ipsec4_if_pool_index_by_key, key4.as_u64);
}
else
{
key6.remote_ip = args->remote_ip.ip6;
key6.spi = clib_host_to_net_u32 (args->remote_spi);
p = hash_get_mem (im->ipsec6_if_pool_index_by_key, &key6);
}
if (args->is_add)
{
/* check if same src/dst pair exists */
if (p)
return VNET_API_ERROR_INVALID_VALUE;
pool_get_aligned_zero (im->tunnel_interfaces, t, CLIB_CACHE_LINE_BYTES);
dev_instance = t - im->tunnel_interfaces;
if (args->renumber)
t->show_instance = args->show_instance;
else
t->show_instance = dev_instance;
if (hash_get (im->ipsec_if_real_dev_by_show_dev, t->show_instance))
{
pool_put (im->tunnel_interfaces, t);
return VNET_API_ERROR_INSTANCE_IN_USE;
}
hash_set (im->ipsec_if_real_dev_by_show_dev, t->show_instance,
dev_instance);
flags = IPSEC_SA_FLAG_IS_TUNNEL;
if (args->is_ip6)
flags |= IPSEC_SA_FLAG_IS_TUNNEL_V6;
if (args->udp_encap)
flags |= IPSEC_SA_FLAG_UDP_ENCAP;
if (args->esn)
flags |= IPSEC_SA_FLAG_USE_ESN;
if (args->anti_replay)
flags |= IPSEC_SA_FLAG_USE_ANTI_REPLAY;
ipsec_mk_key (&crypto_key,
args->remote_crypto_key, args->remote_crypto_key_len);
ipsec_mk_key (&integ_key,
args->remote_integ_key, args->remote_integ_key_len);
rv = ipsec_sa_add_and_lock (ipsec_tun_mk_input_sa_id (dev_instance),
args->remote_spi,
IPSEC_PROTOCOL_ESP,
args->crypto_alg,
&crypto_key,
args->integ_alg,
&integ_key,
(flags | IPSEC_SA_FLAG_IS_INBOUND),
args->tx_table_id,
args->salt,
&args->remote_ip,
&args->local_ip, &t->input_sa_index);
if (rv)
return rv;
ipsec_mk_key (&crypto_key,
args->local_crypto_key, args->local_crypto_key_len);
ipsec_mk_key (&integ_key,
args->local_integ_key, args->local_integ_key_len);
rv = ipsec_sa_add_and_lock (ipsec_tun_mk_output_sa_id (dev_instance),
args->local_spi,
IPSEC_PROTOCOL_ESP,
args->crypto_alg,
&crypto_key,
args->integ_alg,
&integ_key,
flags,
args->tx_table_id,
args->salt,
&args->local_ip,
&args->remote_ip, &t->output_sa_index);
if (rv)
return rv;
/* copy the key */
if (is_ip6)
hash_set_mem_alloc (&im->ipsec6_if_pool_index_by_key, &key6,
t - im->tunnel_interfaces);
else
{
hash_set (im->ipsec4_if_pool_index_by_key, key4.as_u64,
t - im->tunnel_interfaces);
if (1 == hash_elts (im->ipsec4_if_pool_index_by_key))
udp_register_dst_port (vlib_get_main (),
UDP_DST_PORT_ipsec,
ipsec4_if_input_node.index, 1);
}
hw_if_index = vnet_register_interface (vnm, ipsec_device_class.index,
t - im->tunnel_interfaces,
ipsec_hw_class.index,
t - im->tunnel_interfaces);
hi = vnet_get_hw_interface (vnm, hw_if_index);
t->hw_if_index = hw_if_index;
t->sw_if_index = hi->sw_if_index;
/* Standard default jumbo MTU. */
vnet_sw_interface_set_mtu (vnm, t->sw_if_index, 9000);
/* Add the new tunnel to the DB of tunnels per sw_if_index ... */
vec_validate_init_empty (im->ipsec_if_by_sw_if_index, t->sw_if_index,
~0);
im->ipsec_if_by_sw_if_index[t->sw_if_index] = dev_instance;
ipsec_tunnel_feature_set (im, t, 1);
/*1st interface, register protocol */
if (pool_elts (im->tunnel_interfaces) == 1)
{
ip4_register_protocol (IP_PROTOCOL_IPSEC_ESP,
ipsec4_if_input_node.index);
ip6_register_protocol (IP_PROTOCOL_IPSEC_ESP,
ipsec6_if_input_node.index);
}
}
else
{
u32 ti;
/* check if exists */
if (!p)
return VNET_API_ERROR_INVALID_VALUE;
ti = p[0];
t = pool_elt_at_index (im->tunnel_interfaces, ti);
hi = vnet_get_hw_interface (vnm, t->hw_if_index);
vnet_sw_interface_set_flags (vnm, hi->sw_if_index, 0); /* admin down */
ipsec_tunnel_feature_set (im, t, 0);
vnet_delete_hw_interface (vnm, t->hw_if_index);
if (is_ip6)
hash_unset_mem_free (&im->ipsec6_if_pool_index_by_key, &key6);
else
{
hash_unset (im->ipsec4_if_pool_index_by_key, key4.as_u64);
if (0 == hash_elts (im->ipsec4_if_pool_index_by_key))
udp_unregister_dst_port (vlib_get_main (), UDP_DST_PORT_ipsec, 1);
}
hash_unset (im->ipsec_if_real_dev_by_show_dev, t->show_instance);
im->ipsec_if_by_sw_if_index[t->sw_if_index] = ~0;
/* delete input and output SA */
ipsec_sa_unlock (t->input_sa_index);
ipsec_sa_unlock (t->output_sa_index);
pool_put (im->tunnel_interfaces, t);
}
if (sw_if_index)
*sw_if_index = hi->sw_if_index;
return 0;
}
int
ipsec_set_interface_sa (vnet_main_t * vnm, u32 hw_if_index, u32 sa_id,
u8 is_outbound)
{
ipsec_main_t *im = &ipsec_main;
vnet_hw_interface_t *hi;
ipsec_tunnel_if_t *t;
ipsec_sa_t *sa, *old_sa;
u32 sa_index, old_sa_index;
uword *p;
hi = vnet_get_hw_interface (vnm, hw_if_index);
t = pool_elt_at_index (im->tunnel_interfaces, hi->dev_instance);
sa_index = ipsec_sa_find_and_lock (sa_id);
if (INDEX_INVALID == sa_index)
{
clib_warning ("SA with ID %u not found", sa_id);
return VNET_API_ERROR_NO_SUCH_ENTRY;
}
sa = pool_elt_at_index (im->sad, sa_index);
if (!is_outbound)
{
old_sa_index = t->input_sa_index;
old_sa = pool_elt_at_index (im->sad, old_sa_index);
if (ipsec_sa_is_set_IS_TUNNEL_V6 (sa) ^
ipsec_sa_is_set_IS_TUNNEL_V6 (old_sa))
{
clib_warning ("IPsec interface SA endpoints type can't be changed");
return VNET_API_ERROR_INVALID_VALUE;
}
if (ipsec_sa_is_set_IS_TUNNEL_V6 (sa))
{
ipsec6_tunnel_key_t key;
/* unset old inbound hash entry. packets should stop arriving */
key.remote_ip = old_sa->tunnel_src_addr.ip6;
key.spi = clib_host_to_net_u32 (old_sa->spi);
p = hash_get_mem (im->ipsec6_if_pool_index_by_key, &key);
if (p)
hash_unset_mem_free (&im->ipsec6_if_pool_index_by_key, &key);
/* set new inbound SA, then set new hash entry */
t->input_sa_index = sa_index;
key.remote_ip = sa->tunnel_src_addr.ip6;
key.spi = clib_host_to_net_u32 (sa->spi);
hash_set_mem_alloc (&im->ipsec6_if_pool_index_by_key, &key,
hi->dev_instance);
}
else
{
ipsec4_tunnel_key_t key;
/* unset old inbound hash entry. packets should stop arriving */
key.remote_ip.as_u32 = old_sa->tunnel_src_addr.ip4.as_u32;
key.spi = clib_host_to_net_u32 (old_sa->spi);
p = hash_get (im->ipsec4_if_pool_index_by_key, key.as_u64);
if (p)
hash_unset (im->ipsec4_if_pool_index_by_key, key.as_u64);
/* set new inbound SA, then set new hash entry */
t->input_sa_index = sa_index;
key.remote_ip.as_u32 = sa->tunnel_src_addr.ip4.as_u32;
key.spi = clib_host_to_net_u32 (sa->spi);
hash_set (im->ipsec4_if_pool_index_by_key, key.as_u64,
hi->dev_instance);
}
}
else
{
old_sa_index = t->output_sa_index;
old_sa = pool_elt_at_index (im->sad, old_sa_index);
if (ipsec_sa_is_set_IS_TUNNEL_V6 (sa) ^
ipsec_sa_is_set_IS_TUNNEL_V6 (old_sa))
{
clib_warning ("IPsec interface SA endpoints type can't be changed");
return VNET_API_ERROR_INVALID_VALUE;
}
/*
* re-enable the feature to get the new SA in
* the workers are stopped so no packets are sent in the clear
*/
ipsec_tunnel_feature_set (im, t, 0);
t->output_sa_index = sa_index;
ipsec_tunnel_feature_set (im, t, 1);
}
/* remove sa_id to sa_index mapping on old SA */
hash_unset (im->sa_index_by_sa_id, old_sa->id);
if (ipsec_add_del_sa_sess_cb (im, old_sa_index, 0))
{
clib_warning ("IPsec backend add/del callback returned error");
return VNET_API_ERROR_SYSCALL_ERROR_1;
}
ipsec_sa_unlock (old_sa_index);
return 0;
}
clib_error_t *
ipsec_tunnel_if_init (vlib_main_t * vm)
{
ipsec_main_t *im = &ipsec_main;
/* initialize the ipsec-if ip4 hash */
im->ipsec4_if_pool_index_by_key =
hash_create (0, sizeof (ipsec4_tunnel_key_t));
/* initialize the ipsec-if ip6 hash */
im->ipsec6_if_pool_index_by_key = hash_create_mem (0,
sizeof
(ipsec6_tunnel_key_t),
sizeof (uword));
im->ipsec_if_real_dev_by_show_dev = hash_create (0, sizeof (uword));
/* set up feature nodes to drop outbound packets with no crypto alg set */
ipsec_add_feature ("ip4-output", "esp4-no-crypto",
&im->esp4_no_crypto_tun_feature_index);
ipsec_add_feature ("ip6-output", "esp6-no-crypto",
&im->esp6_no_crypto_tun_feature_index);
return 0;
}
VLIB_INIT_FUNCTION (ipsec_tunnel_if_init);
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/