1 files changed, 97 insertions, 0 deletions
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 1b171b5dcf3c..886721da4888 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -272,6 +272,7 @@
 #include <net/tcp.h>
 #include <net/xfrm.h>
 #include <net/ip.h>
+#include <net/ip6_route.h>
 #include <net/netdma.h>
 #include <net/sock.h>
 
@@ -3320,3 +3321,99 @@ void __init tcp_init(void)
 	tcp_secret_retiring = &tcp_secret_two;
 	tcp_secret_secondary = &tcp_secret_two;
 }
+
+static int tcp_is_local(struct net *net, __be32 addr) {
+	struct rtable *rt;
+	struct flowi fl = { .nl_u = { .ip4_u = { .daddr = addr } } };
+	if (ip_route_output_key(net, &rt, &fl) || !rt)
+		return 0;
+	return rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK);
+}
+
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
+static int tcp_is_local6(struct net *net, struct in6_addr *addr) {
+	struct rt6_info *rt6 = rt6_lookup(net, addr, addr, 0, 0);
+	return rt6 && rt6->rt6i_dev && (rt6->rt6i_dev->flags & IFF_LOOPBACK);
+}
+#endif
+
+/*
+ * tcp_nuke_addr - destroy all sockets on the given local address
+ * if local address is the unspecified address (0.0.0.0 or ::), destroy all
+ * sockets with local addresses that are not configured.
+ */
+int tcp_nuke_addr(struct net *net, struct sockaddr *addr)
+{
+	int family = addr->sa_family;
+	unsigned int bucket;
+
+	struct in_addr *in;
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
+	struct in6_addr *in6;
+#endif
+	if (family == AF_INET) {
+		in = &((struct sockaddr_in *)addr)->sin_addr;
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
+	} else if (family == AF_INET6) {
+		in6 = &((struct sockaddr_in6 *)addr)->sin6_addr;
+#endif
+	} else {
+		return -EAFNOSUPPORT;
+	}
+
+	for (bucket = 0; bucket < tcp_hashinfo.ehash_mask; bucket++) {
+		struct hlist_nulls_node *node;
+		struct sock *sk;
+		spinlock_t *lock = inet_ehash_lockp(&tcp_hashinfo, bucket);
+
+restart:
+		spin_lock_bh(lock);
+		sk_nulls_for_each(sk, node, &tcp_hashinfo.ehash[bucket].chain) {
+			struct inet_sock *inet = inet_sk(sk);
+
+			if (family == AF_INET) {
+				__be32 s4 = inet->inet_rcv_saddr;
+				if (in->s_addr != s4 &&
+				    !(in->s_addr == INADDR_ANY &&
+				      !tcp_is_local(net, s4)))
+					continue;
+			}
+
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
+			if (family == AF_INET6) {
+				struct in6_addr *s6;
+				if (!inet->pinet6)
+					continue;
+				s6 = &inet->pinet6->rcv_saddr;
+				if (!ipv6_addr_equal(in6, s6) &&
+				    !(ipv6_addr_equal(in6, &in6addr_any) &&
+				      !tcp_is_local6(net, s6)))
+				continue;
+			}
+#endif
+
+			if (sysctl_ip_dynaddr && sk->sk_state == TCP_SYN_SENT)
+				continue;
+			if (sock_flag(sk, SOCK_DEAD))
+				continue;
+
+			sock_hold(sk);
+			spin_unlock_bh(lock);
+
+			local_bh_disable();
+			bh_lock_sock(sk);
+			sk->sk_err = ETIMEDOUT;
+			sk->sk_error_report(sk);
+
+			tcp_done(sk);
+			bh_unlock_sock(sk);
+			local_bh_enable();
+			sock_put(sk);
+
+			goto restart;
+		}
+		spin_unlock_bh(lock);
+	}
+
+	return 0;
+}