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BFD: Add 'strict bind' option

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Add BFD protocol option 'strict bind' to use separate listening socket
for each BFD interface bound to its address instead of using shared
listening sockets.
This commit is contained in:
Ondrej Zajicek (work)
2022-04-07 19:33:40 +02:00
parent 4b1aa37f93
commit 692055e3df
5 changed files with 70 additions and 11 deletions
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36
proto/bfd/packets.c
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@@ -366,7 +366,9 @@ bfd_rx_hook(sock *sk, uint len)
if (ps > BFD_STATE_DOWN)
DROP("invalid init state", ps);
uint ifindex = (sk->sport == BFD_CONTROL_PORT) ? sk->lifindex : 0;
uint ifindex = (sk->sport == BFD_CONTROL_PORT) ?
(sk->iface ? sk->iface->index : sk->lifindex) :
0;
s = bfd_find_session_by_addr(p, sk->faddr, ifindex);
/* FIXME: better session matching and message */
@@ -438,6 +440,38 @@ bfd_open_rx_sk(struct bfd_proto *p, int multihop, int af)
return NULL;
}
sock *
bfd_open_rx_sk_bound(struct bfd_proto *p, ip_addr local, struct iface *ifa)
{
sock *sk = sk_new(p->tpool);
sk->type = SK_UDP;
sk->saddr = local;
sk->sport = ifa ? BFD_CONTROL_PORT : BFD_MULTI_CTL_PORT;
sk->iface = ifa;
sk->vrf = p->p.vrf;
sk->data = p;
sk->rbsize = BFD_MAX_LEN;
sk->rx_hook = bfd_rx_hook;
sk->err_hook = bfd_err_hook;
/* TODO: configurable ToS and priority */
sk->tos = IP_PREC_INTERNET_CONTROL;
sk->priority = sk_priority_control;
sk->flags = SKF_THREAD | SKF_BIND | (ifa ? SKF_TTL_RX : 0);
if (sk_open(sk) < 0)
goto err;
sk_start(sk);
return sk;
err:
sk_log_error(sk, p->p.name);
rfree(sk);
return NULL;
}
sock *
bfd_open_tx_sk(struct bfd_proto *p, ip_addr local, struct iface *ifa)
{