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bgpd: Set TCP min MSS per listener

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Set only if at least one peer is in passive mode.

Signed-off-by: Donatas Abraitis <donatas@opensourcerouting.org>
This commit is contained in:
Donatas Abraitis 2023-09-18 22:34:45 +03:00
parent 84e14c14dc
commit 81ece63e3e
3 changed files with 50 additions and 0 deletions
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47
bgpd/bgp_network.c
View File

@ -334,6 +334,53 @@ static int bgp_get_instance_for_inc_conn(int sock, struct bgp **bgp_inst)
#endif
}
int bgp_tcp_mss_set(struct peer *peer)
{
struct listnode *node;
int ret = 0;
struct bgp_listener *listener;
uint32_t min_mss = 0;
struct peer *p;
for (ALL_LIST_ELEMENTS_RO(peer->bgp->peer, node, p)) {
if (!CHECK_FLAG(p->flags, PEER_FLAG_TCP_MSS))
continue;
if (!p->tcp_mss)
continue;
if (!min_mss)
min_mss = p->tcp_mss;
min_mss = MIN(min_mss, p->tcp_mss);
}
frr_with_privs(&bgpd_privs) {
for (ALL_LIST_ELEMENTS_RO(bm->listen_sockets, node, listener)) {
if (listener->su.sa.sa_family !=
peer->connection->su.sa.sa_family)
continue;
if (!listener->bgp) {
if (peer->bgp->vrf_id != VRF_DEFAULT)
continue;
} else if (listener->bgp != peer->bgp)
continue;
/* Set TCP MSS per listener only if there is at least
* one peer that is in passive mode. Otherwise, TCP MSS
* is set per socket via bgp_connect().
*/
if (CHECK_FLAG(peer->flags, PEER_FLAG_PASSIVE))
sockopt_tcp_mss_set(listener->fd, min_mss);
break;
}
}
return ret;
}
static void bgp_socket_set_buffer_size(const int fd)
{
if (getsockopt_so_sendbuf(fd) < (int)bm->socket_buffer)

1
bgpd/bgp_network.h
View File

@ -30,6 +30,7 @@ extern int bgp_md5_unset_prefix(struct bgp *bgp, struct prefix *p);
extern int bgp_md5_set(struct peer_connection *connection);
extern int bgp_md5_unset(struct peer_connection *connection);
extern int bgp_set_socket_ttl(struct peer_connection *connection);
extern int bgp_tcp_mss_set(struct peer *peer);
extern int bgp_update_address(struct interface *ifp, const union sockunion *dst,
union sockunion *addr);

2
bgpd/bgpd.c
View File

@ -5779,6 +5779,7 @@ void peer_tcp_mss_set(struct peer *peer, uint32_t tcp_mss)
{
peer->tcp_mss = tcp_mss;
SET_FLAG(peer->flags, PEER_FLAG_TCP_MSS);
bgp_tcp_mss_set(peer);
}
/* Reset the TCP-MSS value in the peer structure,
@ -5789,6 +5790,7 @@ void peer_tcp_mss_unset(struct peer *peer)
{
UNSET_FLAG(peer->flags, PEER_FLAG_TCP_MSS);
peer->tcp_mss = 0;
bgp_tcp_mss_set(peer);
}
/*