Provide functions to determine presence of a given address

configured on a given interface.

Discussed with:	np
Sponsored by:	Nginx, Inc.

sys/dev/cxgbe/tom/t4_listen.c

@@ -1090,35 +1090,6 @@ pass_accept_req_to_protohdrs(const struct mbuf *m, struct in_conninfo *inc,
 	}
 }
 
-static int
-ifnet_has_ip6(struct ifnet *ifp, struct in6_addr *ip6)
-{
-	struct ifaddr *ifa;
-	struct sockaddr_in6 *sin6;
-	int found = 0;
-	struct in6_addr in6 = *ip6;
-
-	/* Just as in ip6_input */
-	if (in6_clearscope(&in6) || in6_clearscope(&in6))
-		return (0);
-	in6_setscope(&in6, ifp, NULL);
-
-	if_addr_rlock(ifp);
-	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
-		sin6 = (void *)ifa->ifa_addr;
-		if (sin6->sin6_family != AF_INET6)
-			continue;
-
-		if (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, &in6)) {
-			found = 1;
-			break;
-		}
-	}
-	if_addr_runlock(ifp);
-
-	return (found);
-}
-
 static struct l2t_entry *
 get_l2te_for_nexthop(struct port_info *pi, struct ifnet *ifp,
     struct in_conninfo *inc)
@@ -1166,29 +1137,6 @@ get_l2te_for_nexthop(struct port_info *pi, struct ifnet *ifp,
 	return (e);
 }
 
-static int
-ifnet_has_ip(struct ifnet *ifp, struct in_addr in)
-{
-	struct ifaddr *ifa;
-	struct sockaddr_in *sin;
-	int found = 0;
-
-	if_addr_rlock(ifp);
-	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
-		sin = (void *)ifa->ifa_addr;
-		if (sin->sin_family != AF_INET)
-			continue;
-
-		if (sin->sin_addr.s_addr == in.s_addr) {
-			found = 1;
-			break;
-		}
-	}
-	if_addr_runlock(ifp);
-
-	return (found);
-}
-
 #define REJECT_PASS_ACCEPT()	do { \
 	reject_reason = __LINE__; \
 	goto reject; \
@@ -1281,7 +1229,7 @@ do_pass_accept_req(struct sge_iq *iq, const struct rss_header *rss,
 		 * SYN must be directed to an IP6 address on this ifnet.  This
 		 * is more restrictive than in6_localip.
 		 */
-		if (!ifnet_has_ip6(ifp, &inc.inc6_laddr))
+		if (!in6_ifhasaddr(ifp, &inc.inc6_laddr))
 			REJECT_PASS_ACCEPT();
 	} else {
 
@@ -1293,7 +1241,7 @@ do_pass_accept_req(struct sge_iq *iq, const struct rss_header *rss,
 		 * SYN must be directed to an IP address on this ifnet.  This
 		 * is more restrictive than in_localip.
 		 */
-		if (!ifnet_has_ip(ifp, inc.inc_laddr))
+		if (!in_ifhasaddr(ifp, inc.inc_laddr))
 			REJECT_PASS_ACCEPT();
 	}
 

sys/netinet/in.c

@@ -127,6 +127,30 @@ in_localip(struct in_addr in)
 	return (0);
 }
 
+/*
+ * Return 1 if an internet address is configured on an interface.
+ */
+int
+in_ifhasaddr(struct ifnet *ifp, struct in_addr in)
+{
+	struct ifaddr *ifa;
+	struct in_ifaddr *ia;
+
+	IF_ADDR_RLOCK(ifp);
+	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
+		if (ifa->ifa_addr->sa_family != AF_INET)
+			continue;
+		ia = (struct in_ifaddr *)ifa;
+		if (ia->ia_addr.sin_addr.s_addr == in.s_addr) {
+			IF_ADDR_RUNLOCK(ifp);
+			return (1);
+		}
+	}
+	IF_ADDR_RUNLOCK(ifp);
+
+	return (0);
+}
+
 /*
  * Return a reference to the interface address which is different to
  * the supplied one but with same IP address value.

sys/netinet/in.h

@@ -642,6 +642,7 @@ int	 in_broadcast(struct in_addr, struct ifnet *);
 int	 in_canforward(struct in_addr);
 int	 in_localaddr(struct in_addr);
 int	 in_localip(struct in_addr);
+int	 in_ifhasaddr(struct ifnet *, struct in_addr);
 int	 inet_aton(const char *, struct in_addr *); /* in libkern */
 char	*inet_ntoa(struct in_addr); /* in libkern */
 char	*inet_ntoa_r(struct in_addr ina, char *buf); /* in libkern */

sys/netinet6/in6.c

@@ -1684,6 +1684,36 @@ in6_localip(struct in6_addr *in6)
 	IN6_IFADDR_RUNLOCK();
 	return (0);
 }
+ 
+/*
+ * Return 1 if an internet address is configured on an interface.
+ */
+int
+in6_ifhasaddr(struct ifnet *ifp, struct in6_addr *addr)
+{
+	struct in6_addr in6;
+	struct ifaddr *ifa;
+	struct in6_ifaddr *ia6;
+
+	in6 = *addr;
+	if (in6_clearscope(&in6) || in6_clearscope(&in6))
+		return (0);
+	in6_setscope(&in6, ifp, NULL);
+
+	IF_ADDR_RLOCK(ifp);
+	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
+		if (ifa->ifa_addr->sa_family != AF_INET6)
+			continue;
+		ia6 = (struct in6_ifaddr *)ifa;
+		if (IN6_ARE_ADDR_EQUAL(&ia6->ia_addr.sin6_addr, &in6)) {
+			IF_ADDR_RUNLOCK(ifp);
+			return (1);
+		}
+	}
+	IF_ADDR_RUNLOCK(ifp);
+
+	return (0);
+}
 
 int
 in6_is_addr_deprecated(struct sockaddr_in6 *sa6)

sys/netinet6/in6.h

@@ -650,6 +650,7 @@ int	in6_cksum_partial(struct mbuf *, u_int8_t, u_int32_t, u_int32_t,
 			  u_int32_t);
 int	in6_localaddr(struct in6_addr *);
 int	in6_localip(struct in6_addr *);
+int	in6_ifhasaddr(struct ifnet *, struct in6_addr *);
 int	in6_addrscope(const struct in6_addr *);
 char	*ip6_sprintf(char *, const struct in6_addr *);
 struct	in6_ifaddr *in6_ifawithifp(struct ifnet *, struct in6_addr *);