The proxy arp entries could not be added into the system over the

IFF_POINTOPOINT link types. The reason was due to the routing
entry returned from the kernel covering the remote end is of an
interface type that does not support ARP. This patch fixes this
problem by providing a hint to the kernel routing code, which
indicates the prefix route instead of the PPP host route should
be returned to the caller. Since a host route to the local end
point is also added into the routing table, and there could be
multiple such instantiations due to multiple PPP links can be
created with the same local end IP address, this patch also fixes
the loopback route installation failure problem observed prior to
this patch. The reference count of loopback route to local end would
be either incremented or decremented. The first instantiation would
create the entry and the last removal would delete the route entry.

MFC after:	5 days

1 files changed, 2 insertions, 0 deletions

diff --git a/sys/net/if_var.h b/sys/net/if_var.h
index 519e6aa..148d72c 100644
--- a/sys/net/if_var.h
+++ b/sys/net/if_var.h
@@ -710,6 +710,7 @@ struct ifaddr {
 	struct mtx ifa_mtx;
 };
 #define	IFA_ROUTE	RTF_UP		/* route installed */
+#define IFA_RTSELF	RTF_HOST	/* loopback route to self installed */
 
 /* for compatibility with other BSDs */
 #define	ifa_list	ifa_link
@@ -843,6 +844,7 @@ void	if_ref(struct ifnet *);
 void	if_rele(struct ifnet *);
 int	if_setlladdr(struct ifnet *, const u_char *, int);
 void	if_up(struct ifnet *);
+/*void	ifinit(void);*/ /* declared in systm.h for main() */
 int	ifioctl(struct socket *, u_long, caddr_t, struct thread *);
 int	ifpromisc(struct ifnet *, int);
 struct	ifnet *ifunit(const char *);