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/*
* nhrp.h: next-hop resolution
*
* Copyright (c) 2016 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/nhrp/nhrp.h>
#include <vnet/fib/fib_table.h>
#include <vnet/adj/adj_midchain.h>
static uword *nhrp_db;
static nhrp_entry_t *nhrp_pool;
void
nhrp_entry_adj_stack (const nhrp_entry_t * ne, adj_index_t ai)
{
adj_midchain_delegate_stack (ai, ne->ne_fib_index, &ne->ne_nh);
}
static adj_walk_rc_t
nhrp_entry_add_adj_walk (adj_index_t ai, void *ctx)
{
nhrp_entry_adj_stack (ctx, ai);
return (ADJ_WALK_RC_CONTINUE);
}
static adj_walk_rc_t
nhrp_entry_del_adj_walk (adj_index_t ai, void *ctx)
{
adj_midchain_delegate_unstack (ai);
return (ADJ_WALK_RC_CONTINUE);
}
nhrp_entry_t *
nhrp_entry_get (index_t nei)
{
return pool_elt_at_index (nhrp_pool, nei);
}
nhrp_entry_t *
nhrp_entry_find (u32 sw_if_index, const ip46_address_t * peer)
{
nhrp_key_t nk = {
.nk_peer = *peer,
.nk_sw_if_index = sw_if_index,
};
uword *p;
p = hash_get_mem (nhrp_db, &nk);
if (NULL != p)
return nhrp_entry_get (p[0]);
return (NULL);
}
int
nhrp_entry_add (u32 sw_if_index,
const ip46_address_t * peer,
u32 nh_table_id, const ip46_address_t * nh)
{
fib_protocol_t fproto;
nhrp_entry_t *ne;
u32 fib_index;
index_t nei;
fproto = (ip46_address_is_ip4 (nh) ? FIB_PROTOCOL_IP4 : FIB_PROTOCOL_IP6);
fib_index = fib_table_find (fproto, nh_table_id);
if (~0 == fib_index)
{
return (VNET_API_ERROR_NO_SUCH_FIB);
}
ne = nhrp_entry_find (sw_if_index, peer);
if (NULL == ne)
{
nhrp_key_t nk = {
.nk_peer = *peer,
.nk_sw_if_index = sw_if_index,
};
nhrp_entry_t *ne;
pool_get_zero (nhrp_pool, ne);
nei = ne - nhrp_pool;
ne->ne_key = clib_mem_alloc (sizeof (*ne->ne_key));
clib_memcpy (ne->ne_key, &nk, sizeof (*ne->ne_key));
ip46_address_copy (&ne->ne_nh.fp_addr, nh);
ne->ne_nh.fp_proto = fproto;
ne->ne_nh.fp_len = (ne->ne_nh.fp_proto == FIB_PROTOCOL_IP4 ? 32 : 128);
ne->ne_fib_index = fib_index;
hash_set_mem (nhrp_db, ne->ne_key, nei);
adj_nbr_walk_nh (sw_if_index,
ne->ne_nh.fp_proto,
&ne->ne_key->nk_peer, nhrp_entry_add_adj_walk, ne);
}
else
return (VNET_API_ERROR_ENTRY_ALREADY_EXISTS);
return 0;
}
int
nhrp_entry_del (u32 sw_if_index, const ip46_address_t * peer)
{
nhrp_entry_t *ne;
ne = nhrp_entry_find (sw_if_index, peer);
if (ne != NULL)
{
hash_unset_mem (nhrp_db, ne->ne_key);
adj_nbr_walk_nh (sw_if_index,
ne->ne_nh.fp_proto,
&ne->ne_key->nk_peer, nhrp_entry_del_adj_walk, ne);
clib_mem_free (ne->ne_key);
pool_put (nhrp_pool, ne);
}
else
return (VNET_API_ERROR_ENTRY_ALREADY_EXISTS);
return 0;
}
u8 *
format_nhrp_entry (u8 * s, va_list * args)
{
index_t nei = va_arg (*args, index_t);
vnet_main_t *vnm = vnet_get_main ();
nhrp_entry_t *ne;
ne = nhrp_entry_get (nei);
s = format (s, "[%d] ", nei);
s = format (s, "%U:%U ", format_vnet_sw_if_index_name,
vnm, ne->ne_key->nk_sw_if_index,
format_ip46_address, &ne->ne_key->nk_peer, IP46_TYPE_ANY);
s = format (s, "via %d:%U",
fib_table_get_table_id (ne->ne_fib_index, ne->ne_nh.fp_proto),
format_fib_prefix, &ne->ne_nh);
return (s);
}
void
nhrp_walk (nhrp_walk_cb_t fn, void *ctx)
{
index_t nei;
/* *INDENT-OFF* */
pool_foreach_index(nei, nhrp_pool,
({
fn(nei, ctx);
}));
/* *INDENT-ON* */
}
static clib_error_t *
nhrp_init (vlib_main_t * vm)
{
nhrp_db = hash_create_mem (0, sizeof (nhrp_key_t), sizeof (u32));
return (NULL);
}
VLIB_INIT_FUNCTION (nhrp_init);
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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