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/*
* Copyright (c) 2020 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.
*/
/**
* @brief FIB Source Address selection
*
* Use the FIB for source address selection on an interface
*/
#include <vnet/fib/fib_sas.h>
#include <vnet/adj/adj_glean.h>
#include <vnet/ip/ip6_link.h>
bool
fib_sas_get (u32 sw_if_index,
ip_address_family_t af,
const ip46_address_t *dst,
ip46_address_t *src)
{
switch (af)
{
case AF_IP4:
if (dst)
return (fib_sas4_get(sw_if_index, &dst->ip4, &src->ip4));
else
return (fib_sas4_get(sw_if_index, NULL, &src->ip4));
case AF_IP6:
if (dst)
return (fib_sas6_get(sw_if_index, &dst->ip6, &src->ip6));
else
return (fib_sas6_get(sw_if_index, NULL, &src->ip6));
}
return (false);
}
bool
fib_sas4_get (u32 sw_if_index,
const ip4_address_t *dst,
ip4_address_t *src)
{
ip46_address_t d_tmp, *d_tmpp = NULL;
const ip46_address_t *s_tmp;
vnet_sw_interface_t *swif;
if (dst)
{
d_tmpp = &d_tmp;
d_tmp.ip4 = *dst;
}
if (vnet_sw_interface_is_p2p(vnet_get_main(), sw_if_index))
{
ip4_address_t *ip4;
ip4 = ip_interface_get_first_ip (sw_if_index, 1);
if (ip4) {
src->as_u32 = ip4->as_u32;
return (true);
} else {
return (false);
}
}
/*
* If the interface is unnumbered then use the IP interface
*/
swif = vnet_get_sw_interface (vnet_get_main(), sw_if_index);
if (swif->flags & VNET_SW_INTERFACE_FLAG_UNNUMBERED)
sw_if_index = swif->unnumbered_sw_if_index;
/*
* get the source address from the glean adjacency
*/
s_tmp = adj_glean_get_src (FIB_PROTOCOL_IP4, sw_if_index, d_tmpp);
if (NULL != s_tmp)
{
src->as_u32 = s_tmp->ip4.as_u32;
return (true);
}
return (false);
}
bool
fib_sas6_get (u32 sw_if_index,
const ip6_address_t *dst,
ip6_address_t *src)
{
ip46_address_t d_tmp, *d_tmpp = NULL;
const ip46_address_t *s_tmp;
if (dst)
{
d_tmpp = &d_tmp;
d_tmp.ip6 = *dst;
}
/*
* if the dst is v6 and link local, use the source link local
*/
if (dst && ip6_address_is_link_local_unicast (dst))
{
const ip6_address_t *ll = ip6_get_link_local_address (sw_if_index);
if (NULL == ll)
{
return (false);
}
ip6_address_copy (src, ll);
return (true);
}
if (vnet_sw_interface_is_p2p(vnet_get_main(), sw_if_index))
{
ip6_address_t *ip6;
ip6 = ip_interface_get_first_ip (sw_if_index, 0);
if (ip6) {
ip6_address_copy(src, ip6);
return (true);
} else {
return (false);
}
}
/*
* get the source address from the glean adjacency
*/
s_tmp = adj_glean_get_src (FIB_PROTOCOL_IP6, sw_if_index, d_tmpp);
if (NULL != s_tmp)
{
ip6_address_copy(src, &s_tmp->ip6);
return (true);
}
return (false);
}
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