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netlink: Fix adding routes with nexthops on p2p interfaces.

Browse source 
Use full-featured ifa_ifwithroute() to guess route ifa/ifp
 instead of ifa_ifwithnet(). This change makes the route addition
 logic closer to the rt_getifa_fib() used by rtsock.

Reported by:	glebius
Tested by:	glebius
Differential Revision: https://reviews.freebsd.org/D39335
MFC after:	2 weeks
This commit is contained in:
Alexander V. Chernikov 2023-03-29 14:13:44 +00:00
parent 140ddeba08
commit b755f1a009
1 changed files with 12 additions and 4 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

16
sys/netlink/route/rt.c
View file

@ -661,7 +661,7 @@ handle_rtm_dump(struct nlpcb *nlp, uint32_t fibnum, int family,
}
static struct nhop_object *
finalize_nhop(struct nhop_object *nh, int *perror)
finalize_nhop(struct nhop_object *nh, const struct sockaddr *dst, int *perror)
{
/*
* The following MUST be filled:
@ -682,7 +682,15 @@ finalize_nhop(struct nhop_object *nh, int *perror)
} else {
/* Gateway is set up, we can derive ifp if not set */
if (nh->nh_ifp == NULL) {
struct ifaddr *ifa = ifa_ifwithnet(&nh->gw_sa, 1, nhop_get_fibnum(nh));
uint32_t fibnum = nhop_get_fibnum(nh);
uint32_t flags = 0;
if (nh->nh_flags & NHF_GATEWAY)
flags = RTF_GATEWAY;
else if (nh->nh_flags & NHF_HOST)
flags = RTF_HOST;
struct ifaddr *ifa = ifa_ifwithroute(flags, dst, &nh->gw_sa, fibnum);
if (ifa == NULL) {
NL_LOG(LOG_DEBUG, "Unable to determine ifp, skipping");
*perror = EINVAL;
@ -765,7 +773,7 @@ create_nexthop_one(struct nl_parsed_route *attrs, struct rta_mpath_nh *mpnh,
if (attrs->rtm_protocol > RTPROT_STATIC)
nhop_set_origin(nh, attrs->rtm_protocol);
*pnh = finalize_nhop(nh, &error);
*pnh = finalize_nhop(nh, attrs->rta_dst, &error);
return (error);
}
@ -852,7 +860,7 @@ create_nexthop_from_attrs(struct nl_parsed_route *attrs,
/* TODO: return ENOTSUP for other types if strict option is set */
}
nh = finalize_nhop(nh, perror);
nh = finalize_nhop(nh, attrs->rta_dst, perror);
}
return (nh);