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bgpd: update route leak when vrf state changes

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Locally leaked routes remain active after the nexthop VRF interface goes
down.

Update route leaking when the loopback or a VRF interface state change is
received from zebra.

Signed-off-by: Louis Scalbert <louis.scalbert@6wind.com>
This commit is contained in:
Louis Scalbert 2022-04-26 16:57:45 +02:00
parent c102adde30
commit b45c5cd959
5 changed files with 46 additions and 1 deletions
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12
bgpd/bgp_attr.c
View file

@ -2347,6 +2347,12 @@ int bgp_mp_reach_parse(struct bgp_attr_parser_args *args,
return BGP_ATTR_PARSE_WITHDRAW;
}
attr->nh_ifindex = peer->nexthop.ifp->ifindex;
if (if_is_operative(peer->nexthop.ifp))
SET_FLAG(attr->nh_flags,
BGP_ATTR_NH_IF_OPERSTATE);
else
UNSET_FLAG(attr->nh_flags,
BGP_ATTR_NH_IF_OPERSTATE);
}
break;
case BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL:
@ -2364,6 +2370,12 @@ int bgp_mp_reach_parse(struct bgp_attr_parser_args *args,
return BGP_ATTR_PARSE_WITHDRAW;
}
attr->nh_ifindex = peer->nexthop.ifp->ifindex;
if (if_is_operative(peer->nexthop.ifp))
SET_FLAG(attr->nh_flags,
BGP_ATTR_NH_IF_OPERSTATE);
else
UNSET_FLAG(attr->nh_flags,
BGP_ATTR_NH_IF_OPERSTATE);
}
if (attr->mp_nexthop_len
== BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL) {

1
bgpd/bgp_attr.h
View file

@ -158,6 +158,7 @@ struct attr {
uint8_t nh_flags;
#define BGP_ATTR_NH_VALID 0x01
#define BGP_ATTR_NH_IF_OPERSTATE 0x02
/* Path origin attribute */
uint8_t origin;

12
bgpd/bgp_mplsvpn.c
View file

@ -2093,8 +2093,9 @@ static void vpn_leak_to_vrf_update_onevrf(struct bgp *to_bgp, /* to */
struct bgp_path_info *bpi;
int origin_local = 0;
struct bgp *src_vrf;
struct interface *ifp;
struct interface *ifp = NULL;
char rd_buf[RD_ADDRSTRLEN];
int debug = BGP_DEBUG(vpn, VPN_LEAK_TO_VRF);
if (!vpn_leak_from_vpn_active(to_bgp, afi, &debugmsg)) {
@ -2260,6 +2261,15 @@ static void vpn_leak_to_vrf_update_onevrf(struct bgp *to_bgp, /* to */
break;
}
if (!ifp && static_attr.nh_ifindex)
ifp = if_lookup_by_index(static_attr.nh_ifindex,
src_vrf->vrf_id);
if (ifp && if_is_operative(ifp))
SET_FLAG(static_attr.nh_flags, BGP_ATTR_NH_IF_OPERSTATE);
else
UNSET_FLAG(static_attr.nh_flags, BGP_ATTR_NH_IF_OPERSTATE);
/*
* route map handling
*/

6
bgpd/bgp_route.c
View file

@ -8569,6 +8569,7 @@ void bgp_redistribute_add(struct bgp *bgp, struct prefix *p,
afi_t afi;
route_map_result_t ret;
struct bgp_redist *red;
struct interface *ifp;
if (CHECK_FLAG(bgp->flags, BGP_FLAG_DELETE_IN_PROGRESS) ||
bgp->peer_self == NULL)
@ -8628,6 +8629,11 @@ void bgp_redistribute_add(struct bgp *bgp, struct prefix *p,
}
attr.nh_type = nhtype;
attr.nh_ifindex = ifindex;
ifp = if_lookup_by_index(ifindex, bgp->vrf_id);
if (ifp && if_is_operative(ifp))
SET_FLAG(attr.nh_flags, BGP_ATTR_NH_IF_OPERSTATE);
else
UNSET_FLAG(attr.nh_flags, BGP_ATTR_NH_IF_OPERSTATE);
attr.med = metric;
attr.distance = distance;

16
bgpd/bgp_zebra.c
View file

@ -235,6 +235,14 @@ static int bgp_ifp_up(struct interface *ifp)
hook_call(bgp_vrf_status_changed, bgp, ifp);
bgp_nht_ifp_up(ifp);
if (bgp_get_default() && if_is_loopback(ifp)) {
vpn_leak_zebra_vrf_label_update(bgp, AFI_IP);
vpn_leak_zebra_vrf_label_update(bgp, AFI_IP6);
vpn_leak_zebra_vrf_sid_update(bgp, AFI_IP);
vpn_leak_zebra_vrf_sid_update(bgp, AFI_IP6);
vpn_leak_postchange_all();
}
return 0;
}
@ -282,6 +290,14 @@ static int bgp_ifp_down(struct interface *ifp)
hook_call(bgp_vrf_status_changed, bgp, ifp);
bgp_nht_ifp_down(ifp);
if (bgp_get_default() && if_is_loopback(ifp)) {
vpn_leak_zebra_vrf_label_withdraw(bgp, AFI_IP);
vpn_leak_zebra_vrf_label_withdraw(bgp, AFI_IP6);
vpn_leak_zebra_vrf_sid_withdraw(bgp, AFI_IP);
vpn_leak_zebra_vrf_sid_withdraw(bgp, AFI_IP6);
vpn_leak_postchange_all();
}
return 0;
}