Fix CARP in backup mode by properly registering its hooks for INET and INET6

using ipproto_{un,}register() and the newly created ip6proto_{un,}register()
so that it can again receive IPPROTO_CARP packets allowing its state machine
to work.

Reviewed by:	bz
Approved by:	ken (mentor)

1 files changed, 15 insertions, 0 deletions

diff --git a/sys/netinet/ip_carp.c b/sys/netinet/ip_carp.c
index 08c3257..569f6b3 100644
--- a/sys/netinet/ip_carp.c
+++ b/sys/netinet/ip_carp.c
@@ -2313,6 +2313,7 @@ carp_mod_cleanup(void)
 	if_clone_detach(&carp_cloner);
 #ifdef INET
 	if (proto_reg[CARP_INET] == 0) {
+		(void)ipproto_unregister(IPPROTO_CARP);
 		pf_proto_unregister(PF_INET, IPPROTO_CARP, SOCK_RAW);
 		proto_reg[CARP_INET] = -1;
 	}
@@ -2320,6 +2321,7 @@ carp_mod_cleanup(void)
 #endif
 #ifdef INET6
 	if (proto_reg[CARP_INET6] == 0) {
+		(void)ip6proto_unregister(IPPROTO_CARP);
 		pf_proto_unregister(PF_INET6, IPPROTO_CARP, SOCK_RAW);
 		proto_reg[CARP_INET6] = -1;
 	}
@@ -2335,6 +2337,7 @@ carp_mod_cleanup(void)
 static int
 carp_mod_load(void)
 {
+	int err;
 
 	if_detach_event_tag = EVENTHANDLER_REGISTER(ifnet_departure_event,
 		carp_ifdetach, NULL, EVENTHANDLER_PRI_ANY);
@@ -2357,6 +2360,12 @@ carp_mod_load(void)
 		carp_mod_cleanup();
 		return (EINVAL);
 	}
+	err = ip6proto_register(IPPROTO_CARP);
+	if (err) {
+		printf("carp: error %d registering with INET6\n", err);
+		carp_mod_cleanup();
+		return (EINVAL);
+	}
 #endif
 #ifdef INET
 	carp_iamatch_p = carp_iamatch;
@@ -2367,6 +2376,12 @@ carp_mod_load(void)
 		carp_mod_cleanup();
 		return (EINVAL);
 	}
+	err = ipproto_register(IPPROTO_CARP);
+	if (err) {
+		printf("carp: error %d registering with INET\n", err);
+		carp_mod_cleanup();
+		return (EINVAL);
+	}
 #endif
 	return 0;
 }