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Fix 'in6_purgeaddr: err=65, destination address delete failed' message.

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P2P ifa may require 2 routes: one is the loopback route, another is
 the "prefix" route towards its destination.

Current code marks loopback routes existence with IFA_RTSELF and
 "prefix" p2p routes with IFA_ROUTE.

For historic reasons, we fill in ifa_dstaddr for loopback interfaces.
To avoid installing the same route twice, we preemptively set
 IFA_RTSELF when adding "prefix" route for loopback.
However, the teardown part doesn't have this hack, so we try to
 remove the same route twice.

Fix this by checking if ifa_dstaddr is different from the ifa_addr
 and moving this logic into a separate function.

Reviewed By: kp
Differential Revision: https://reviews.freebsd.org/D29121
MFC after:	3 days
This commit is contained in:
Alexander V. Chernikov 2021-03-08 20:27:29 +00:00
parent f2f8405cf6
commit 7634919e15
1 changed files with 18 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

32
sys/netinet6/in6.c
View File

@ -1294,13 +1294,27 @@ in6_handle_dstaddr_rtrequest(int cmd, struct in6_ifaddr *ia)
return (error);
}
static bool
ifa_is_p2p(struct in6_ifaddr *ia)
{
int plen;
plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */
if ((plen == 128) && (ia->ia_dstaddr.sin6_family == AF_INET6) &&
!IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, &ia->ia_dstaddr.sin6_addr))
return (true);
return (false);
}
void
in6_purgeaddr(struct ifaddr *ifa)
{
struct ifnet *ifp = ifa->ifa_ifp;
struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa;
struct in6_multi_mship *imm;
int plen, error;
int error;
if (ifa->ifa_carp)
(*carp_detach_p)(ifa, false);
@ -1328,10 +1342,7 @@ in6_purgeaddr(struct ifaddr *ifa)
free(imm, M_IP6MADDR);
}
/* Check if we need to remove p2p route */
plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */
if (ia->ia_dstaddr.sin6_family != AF_INET6)
plen = 0;
if ((ia->ia_flags & IFA_ROUTE) && plen == 128) {
if ((ia->ia_flags & IFA_ROUTE) && ifa_is_p2p(ia)) {
error = in6_handle_dstaddr_rtrequest(RTM_DELETE, ia);
if (error != 0)
log(LOG_INFO, "%s: err=%d, destination address delete "
@ -1434,7 +1445,7 @@ static int
in6_notify_ifa(struct ifnet *ifp, struct in6_ifaddr *ia,
struct in6_aliasreq *ifra, int hostIsNew)
{
int error = 0, plen, ifacount = 0;
int error = 0, ifacount = 0;
struct ifaddr *ifa;
struct sockaddr_in6 *pdst;
char ip6buf[INET6_ADDRSTRLEN];
@ -1487,14 +1498,7 @@ in6_notify_ifa(struct ifnet *ifp, struct in6_ifaddr *ia,
* XXX: the logic below rejects assigning multiple addresses on a p2p
* interface that share the same destination.
*/
plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */
if (!(ia->ia_flags & IFA_ROUTE) && plen == 128 &&
ia->ia_dstaddr.sin6_family == AF_INET6) {
/*
* Handle the case for ::1 .
*/
if (ifp->if_flags & IFF_LOOPBACK)
ia->ia_flags |= IFA_RTSELF;
if (!(ia->ia_flags & IFA_ROUTE) && ifa_is_p2p(ia)) {
error = in6_handle_dstaddr_rtrequest(RTM_ADD, ia);
if (error)
goto done;