net: Support nuking IPv6 sockets as well as IPv4.
On Linux, when an interface goes down all its IPv6
addresses are deleted, so relying on knowing the previous
IPv6 addresses on the interface is brittle. Instead,
support nuking all sockets that are bound to IP addresses
that are not configured and up on the system. This
behaviour is triggered by specifying the unspecified
address (:: or 0.0.0.0). If an IP address is specified, the
behaviour is unchanged, except the ioctl now supports IPv6
as well as IPv4.
Signed-off-by: Lorenzo Colitti <lorenzo@google.com>
diff --git a/include/net/tcp.h b/include/net/tcp.h
index ffdb402..090e1c7 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -1438,7 +1438,7 @@
extern int tcp_gro_complete(struct sk_buff *skb);
extern int tcp4_gro_complete(struct sk_buff *skb);
-extern void tcp_v4_nuke_addr(__u32 saddr);
+extern int tcp_nuke_addr(struct net *net, struct sockaddr *addr);
#ifdef CONFIG_PROC_FS
extern int tcp4_proc_init(void);
diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c
index d1dc83c..e9b81e6 100644
--- a/net/ipv4/devinet.c
+++ b/net/ipv4/devinet.c
@@ -916,8 +916,7 @@
}
break;
case SIOCKILLADDR: /* Nuke all connections on this address */
- ret = 0;
- tcp_v4_nuke_addr(sin->sin_addr.s_addr);
+ ret = tcp_nuke_addr(net, (struct sockaddr *) sin);
break;
}
done:
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index b9693c1..9533161 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>
@@ -3317,3 +3318,99 @@
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;
+}
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index a4430ed..a9db4b1 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -1976,49 +1976,6 @@
}
EXPORT_SYMBOL(tcp_v4_destroy_sock);
-/*
- * tcp_v4_nuke_addr - destroy all sockets on the given local address
- */
-void tcp_v4_nuke_addr(__u32 saddr)
-{
- unsigned int bucket;
-
- 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 (inet->inet_rcv_saddr != saddr)
- continue;
- 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);
- }
-}
-
#ifdef CONFIG_PROC_FS
/* Proc filesystem TCP sock list dumping. */
diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c
index 4eb4d74..4252b3c 100644
--- a/net/ipv6/af_inet6.c
+++ b/net/ipv6/af_inet6.c
@@ -494,6 +494,21 @@
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;
+ ipv6_addr_copy(&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;
@@ -518,6 +533,8 @@
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;
