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Netlink: Fix parsing of MPLS multipath routes

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Add support for RTA_MULTIPATH attribute parsing for AF_MPLS routes.

BIRD is capable of installing a multipath route into kernel on Linux,
but it would not be seen because parsing fails. This made BIRD attempt
to install the same route repeatedly.

(The patch minorly updated by committer)
This commit is contained in:
Kazuki Yamaguchi 2020-06-03 15:18:02 +02:00 committed by Ondrej Zajicek (work)
parent 19f8f17320
commit f1b5f179db
1 changed files with 17 additions and 0 deletions
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17
sysdep/linux/netlink.c
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@ -357,6 +357,11 @@ static struct nl_want_attrs nexthop_attr_want6[BIRD_RTA_MAX] = {
};
#ifdef HAVE_MPLS_KERNEL
static struct nl_want_attrs nexthop_attr_want_mpls[BIRD_RTA_MAX] = {
[RTA_VIA] = { 1, 0, 0 },
[RTA_NEWDST] = { 1, 0, 0 },
};
static struct nl_want_attrs encap_mpls_want[BIRD_RTA_MAX] = {
[RTA_DST] = { 1, 0, 0 },
};
@ -401,6 +406,7 @@ static struct nl_want_attrs rtm_attr_want_mpls[BIRD_RTA_MAX] = {
[RTA_OIF] = { 1, 1, sizeof(u32) },
[RTA_PRIORITY] = { 1, 1, sizeof(u32) },
[RTA_METRICS] = { 1, 0, 0 },
[RTA_MULTIPATH] = { 1, 0, 0 },
[RTA_FLOW] = { 1, 1, sizeof(u32) },
[RTA_TABLE] = { 1, 1, sizeof(u32) },
[RTA_VIA] = { 1, 0, 0 },
@ -703,6 +709,17 @@ nl_parse_multipath(struct nl_parse_state *s, struct krt_proto *p, struct rtattr
return NULL;
break;
#ifdef HAVE_MPLS_KERNEL
case AF_MPLS:
if (!nl_parse_attrs(RTNH_DATA(nh), nexthop_attr_want_mpls, a, sizeof(a)))
return NULL;
if (a[RTA_NEWDST])
rv->labels = rta_get_mpls(a[RTA_NEWDST], rv->label);
break;
#endif
default:
return NULL;
}