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bgpd: fix sending ipv6 local nexthop if global present

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bgpd keeps on advertising IPv6 prefixes with a IPv6 link-local nexthop
after a valid IPv6 global appears.

At bgpd startup, the IPv6 global is announced by zebra after the
link-local. Only the link-local is advertised. Clearing the BGP sessions
make the global to to be announced.

Update the nexthops with the global IPv6 when available.

Signed-off-by: Louis Scalbert <louis.scalbert@6wind.com>
This commit is contained in:
Louis Scalbert 2024-03-28 11:11:05 +01:00
parent b083885198
commit 424fe0bf80
1 changed files with 28 additions and 5 deletions
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33
bgpd/bgp_zebra.c
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@ -303,11 +303,12 @@ static int bgp_ifp_down(struct interface *ifp)
static int bgp_interface_address_add(ZAPI_CALLBACK_ARGS) static int bgp_interface_address_add(ZAPI_CALLBACK_ARGS)
{ {
struct connected *ifc; struct connected *ifc, *connected;
struct bgp *bgp; struct bgp *bgp;
struct peer *peer; struct peer *peer;
struct prefix *addr; struct prefix *addr;
struct listnode *node, *nnode; struct listnode *node, *nnode;
bool v6_ll_in_nh_global;
afi_t afi; afi_t afi;
safi_t safi; safi_t safi;
@ -342,6 +343,27 @@ static int bgp_interface_address_add(ZAPI_CALLBACK_ARGS)
addr = ifc->address; addr = ifc->address;
for (ALL_LIST_ELEMENTS(bgp->peer, node, nnode, peer)) { for (ALL_LIST_ELEMENTS(bgp->peer, node, nnode, peer)) {
v6_ll_in_nh_global = false;
if (IN6_IS_ADDR_LINKLOCAL(&peer->nexthop.v6_global)) {
frr_each (if_connected, ifc->ifp->connected,
connected) {
if (connected->address->family !=
AF_INET6)
continue;
if (!IPV6_ADDR_SAME(&connected->address
->u.prefix6,
&peer->nexthop
.v6_global))
continue;
/* peer->nexthop.v6_global contains a link-local address
* that needs to be replaced by the global address.
*/
v6_ll_in_nh_global = true;
break;
}
}
/* /*
* If the Peer's interface name matches the * If the Peer's interface name matches the
* interface name for which BGP received the * interface name for which BGP received the
@ -352,10 +374,11 @@ static int bgp_interface_address_add(ZAPI_CALLBACK_ARGS)
* into peer's v6_global and send updates out * into peer's v6_global and send updates out
* with new nexthop addr. * with new nexthop addr.
*/ */
if ((peer->conf_if && if (v6_ll_in_nh_global ||
(strcmp(peer->conf_if, ifc->ifp->name) == 0)) && (peer->conf_if &&
((IS_MAPPED_IPV6(&peer->nexthop.v6_global)) || strcmp(peer->conf_if, ifc->ifp->name) == 0 &&
IN6_IS_ADDR_LINKLOCAL(&peer->nexthop.v6_global))) { (IS_MAPPED_IPV6(&peer->nexthop.v6_global) ||
IN6_IS_ADDR_LINKLOCAL(&peer->nexthop.v6_global)))) {
if (bgp_debug_zebra(ifc->address)) { if (bgp_debug_zebra(ifc->address)) {
zlog_debug("Update peer %pBP's current intf global addr from %pI6 to %pI6 and send updates", zlog_debug("Update peer %pBP's current intf global addr from %pI6 to %pI6 and send updates",
peer, peer,