[IPV4/IPV6]: Consolidate saddr resetting into inet_reset_saddr().

include/net/ip.h

@@ -230,6 +230,23 @@ static inline void ip_eth_mc_map(u32 addr, char *buf)
 	buf[3]=addr&0x7F;
 }
 
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
+#include <linux/ipv6.h>
+#endif
+
+static __inline__ void inet_reset_saddr(struct sock *sk)
+{
+	inet_sk(sk)->rcv_saddr = inet_sk(sk)->saddr = 0;
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
+	if (sk->family == PF_INET6) {
+		struct ipv6_pinfo *np = inet6_sk(sk);
+
+		memset(&np->saddr, 0, sizeof(np->saddr));
+		memset(&np->rcv_saddr, 0, sizeof(np->rcv_saddr));
+	}
+#endif
+}
+
 #endif
 
 extern int	ip_call_ra_chain(struct sk_buff *skb);

net/ipv4/tcp.c

@@ -2140,17 +2140,8 @@ int tcp_disconnect(struct sock *sk, int flags)
 
 	inet->dport = 0;
 
-	if (!(sk->userlocks & SOCK_BINDADDR_LOCK)) {
-		inet->rcv_saddr = inet->saddr = 0;
-#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
-		if (sk->family == PF_INET6) {
-			struct ipv6_pinfo *np = inet6_sk(sk);
-
-			memset(&np->saddr, 0, 16);
-			memset(&np->rcv_saddr, 0, 16);
-		}
-#endif
-	}
+	if (!(sk->userlocks & SOCK_BINDADDR_LOCK))
+		inet_reset_saddr(sk);
 
 	sk->shutdown = 0;
 	__clear_bit(SOCK_DONE, &sk->flags);

net/ipv4/udp.c

@@ -920,17 +920,9 @@ int udp_disconnect(struct sock *sk, int flags)
 	inet->daddr = 0;
 	inet->dport = 0;
 	sk->bound_dev_if = 0;
-	if (!(sk->userlocks&SOCK_BINDADDR_LOCK)) {
-		inet->rcv_saddr = inet->saddr = 0;
-#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
-		if (sk->family == PF_INET6) {
-			struct ipv6_pinfo *np = inet6_sk(sk);
-
-			memset(&np->saddr, 0, 16);
-			memset(&np->rcv_saddr, 0, 16);
-		}
-#endif
-	}
+	if (!(sk->userlocks & SOCK_BINDADDR_LOCK))
+		inet_reset_saddr(sk);
+
 	if (!(sk->userlocks&SOCK_BINDPORT_LOCK)) {
 		sk->prot->unhash(sk);
 		inet->sport = 0;

net/ipv6/af_inet6.c

@@ -355,10 +355,7 @@ int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 
 	/* Make sure we are allowed to bind here. */
 	if (sk->prot->get_port(sk, snum) != 0) {
-		inet->rcv_saddr = inet->saddr = 0;
-		memset(&np->rcv_saddr, 0, sizeof(struct in6_addr));
-		memset(&np->saddr, 0, sizeof(struct in6_addr));
-
+		inet_reset_saddr(sk);
 		release_sock(sk);
 		return -EADDRINUSE;
 	}