Revert "net: socket ioctl to reset connections matching local address"

Use SOCK_DESTROY from now instead of SIOCKILLADDR

This reverts commit 38f0ec724f.

Change-Id: I2dcd833b66c88a48de8978dce9d72ab78f9af549

include/net/tcp.h

@@ -1681,8 +1681,6 @@ static inline bool tcp_stream_memory_free(const struct sock *sk)
 	return notsent_bytes < tcp_notsent_lowat(tp);
 }
 
-extern int tcp_nuke_addr(struct net *net, struct sockaddr *addr);
-
 #ifdef CONFIG_PROC_FS
 int tcp4_proc_init(void);
 void tcp4_proc_exit(void);

include/uapi/linux/sockios.h

@@ -65,7 +65,6 @@
 #define SIOCDIFADDR	0x8936		/* delete PA address		*/
 #define	SIOCSIFHWBROADCAST	0x8937	/* set hardware broadcast addr	*/
 #define SIOCGIFCOUNT	0x8938		/* get number of devices */
-#define SIOCKILLADDR	0x8939		/* kill sockets with this local addr */
 
 #define SIOCGIFBR	0x8940		/* Bridging support		*/
 #define SIOCSIFBR	0x8941		/* Set bridging options 	*/

net/ipv4/af_inet.c

@@ -886,7 +886,6 @@ int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 	case SIOCSIFPFLAGS:
 	case SIOCGIFPFLAGS:
 	case SIOCSIFFLAGS:
-	case SIOCKILLADDR:
 		err = devinet_ioctl(net, cmd, (void __user *)arg);
 		break;
 	default:

net/ipv4/devinet.c

@@ -59,7 +59,6 @@
 
 #include <net/arp.h>
 #include <net/ip.h>
-#include <net/tcp.h>
 #include <net/route.h>
 #include <net/ip_fib.h>
 #include <net/rtnetlink.h>
@@ -969,7 +968,6 @@ int devinet_ioctl(struct net *net, unsigned int cmd, void __user *arg)
 	case SIOCSIFBRDADDR:	/* Set the broadcast address */
 	case SIOCSIFDSTADDR:	/* Set the destination address */
 	case SIOCSIFNETMASK: 	/* Set the netmask for the interface */
-	case SIOCKILLADDR:	/* Nuke all sockets on this address */
 		ret = -EPERM;
 		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 			goto out;
@@ -1021,8 +1019,7 @@ int devinet_ioctl(struct net *net, unsigned int cmd, void __user *arg)
 	}
 
 	ret = -EADDRNOTAVAIL;
-	if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS
-	    && cmd != SIOCKILLADDR)
+	if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS)
 		goto done;
 
 	switch (cmd) {
@@ -1149,9 +1146,6 @@ int devinet_ioctl(struct net *net, unsigned int cmd, void __user *arg)
 			inet_insert_ifa(ifa);
 		}
 		break;
-	case SIOCKILLADDR:	/* Nuke all connections on this address */
-		ret = tcp_nuke_addr(net, (struct sockaddr *) sin);
-		break;
 	}
 done:
 	rtnl_unlock();

net/ipv4/tcp.c

@@ -276,9 +276,6 @@
 #include <net/tcp.h>
 #include <net/xfrm.h>
 #include <net/ip.h>
-#include <net/ip6_route.h>
-#include <net/ipv6.h>
-#include <net/transp_v6.h>
 #include <net/sock.h>
 
 #include <asm/uaccess.h>
@@ -3254,105 +3251,3 @@ void __init tcp_init(void)
 	BUG_ON(tcp_register_congestion_control(&tcp_reno) != 0);
 	tcp_tasklet_init();
 }
-
-static int tcp_is_local(struct net *net, __be32 addr) {
-	struct rtable *rt;
-	struct flowi4 fl4 = { .daddr = addr };
-	rt = ip_route_output_key(net, &fl4);
-	if (IS_ERR_OR_NULL(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->dst.dev && (rt6->dst.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 = NULL;
-#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 (sysctl_ip_dynaddr && sk->sk_state == TCP_SYN_SENT)
-				continue;
-			if (sock_flag(sk, SOCK_DEAD))
-				continue;
-
-			if (family == AF_INET) {
-				__be32 s4 = inet->inet_rcv_saddr;
-				if (s4 == LOOPBACK4_IPV6)
-					continue;
-
-				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;
-
-				s6 = &sk->sk_v6_rcv_saddr;
-				if (ipv6_addr_type(s6) == IPV6_ADDR_MAPPED)
-					continue;
-
-				if (!ipv6_addr_equal(in6, s6) &&
-				    !(ipv6_addr_equal(in6, &in6addr_any) &&
-				      !tcp_is_local6(net, s6)))
-				continue;
-			}
-#endif
-
-			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;
-}

net/ipv6/af_inet6.c

@@ -495,21 +495,6 @@ int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
 }
 EXPORT_SYMBOL(inet6_getname);
 
-int inet6_killaddr_ioctl(struct net *net, void __user *arg) {
-	struct in6_ifreq ireq;
-	struct sockaddr_in6 sin6;
-
-	if (!capable(CAP_NET_ADMIN))
-		return -EACCES;
-
-	if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
-		return -EFAULT;
-
-	sin6.sin6_family = AF_INET6;
-	sin6.sin6_addr = ireq.ifr6_addr;
-	return tcp_nuke_addr(net, (struct sockaddr *) &sin6);
-}
-
 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 {
 	struct sock *sk = sock->sk;
@@ -533,8 +518,6 @@ int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 		return addrconf_del_ifaddr(net, (void __user *) arg);
 	case SIOCSIFDSTADDR:
 		return addrconf_set_dstaddr(net, (void __user *) arg);
-	case SIOCKILLADDR:
-		return inet6_killaddr_ioctl(net, (void __user *) arg);
 	default:
 		if (!sk->sk_prot->ioctl)
 			return -ENOIOCTLCMD;