diff options
| author | Robert Love <rlove@google.com> | 2008-05-12 17:08:29 -0400 |
|---|---|---|
| committer | Arve Hjønnevåg <arve@android.com> | 2009-04-07 16:43:12 -0700 |
| commit | 2df5996350da51bcdee798c00ae1f2415fd9ad20 (patch) | |
| tree | ebdc507e56bb5c6c842e0b7afd8220f04c87528e /net/ipv4 | |
| parent | 99518ba0de32a820131f5b55f92740213acdd369 (diff) | |
net: socket ioctl to reset connections matching local address
Introduce a new socket ioctl, SIOCKILLADDR, that nukes all sockets
bound to the same local address. This is useful in situations with
dynamic IPs, to kill stuck connections.
Signed-off-by: Brian Swetland <swetland@google.com>
net: fix tcp_v4_nuke_addr
Signed-off-by: Dima Zavin <dima@android.com>
Diffstat (limited to 'net/ipv4')
| -rw-r--r-- | net/ipv4/af_inet.c | 1 | ||||
| -rw-r--r-- | net/ipv4/devinet.c | 9 | ||||
| -rw-r--r-- | net/ipv4/tcp_ipv4.c | 31 |
3 files changed, 40 insertions, 1 deletions
diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c index 27410c339e19..ee76b0bd4be9 100644 --- a/net/ipv4/af_inet.c +++ b/net/ipv4/af_inet.c @@ -856,6 +856,7 @@ 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: diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c index 309997edc8a5..6bc2397cad5a 100644 --- a/net/ipv4/devinet.c +++ b/net/ipv4/devinet.c @@ -57,6 +57,7 @@ #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> @@ -631,6 +632,7 @@ 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 = -EACCES; if (!capable(CAP_NET_ADMIN)) goto out; @@ -680,7 +682,8 @@ int devinet_ioctl(struct net *net, unsigned int cmd, void __user *arg) } ret = -EADDRNOTAVAIL; - if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS) + if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS + && cmd != SIOCKILLADDR) goto done; switch (cmd) { @@ -804,6 +807,10 @@ 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 = 0; + tcp_v4_nuke_addr(sin->sin_addr.s_addr); + break; } done: rtnl_unlock(); diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c index cf74c416831a..7c05a50c8840 100644 --- a/net/ipv4/tcp_ipv4.c +++ b/net/ipv4/tcp_ipv4.c @@ -1853,6 +1853,37 @@ void tcp_v4_destroy_sock(struct sock *sk) 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_size; bucket++) { + struct hlist_nulls_node *node; + struct sock *sk; + spinlock_t *lock = inet_ehash_lockp(&tcp_hashinfo, bucket); + + spin_lock_bh(lock); + sk_nulls_for_each(sk, node, &tcp_hashinfo.ehash[bucket].chain) { + struct inet_sock *inet = inet_sk(sk); + + if (inet->rcv_saddr != saddr) + continue; + if (sysctl_ip_dynaddr && sk->sk_state == TCP_SYN_SENT) + continue; + if (sock_flag(sk, SOCK_DEAD)) + continue; + + sk->sk_err = ETIMEDOUT; + sk->sk_error_report(sk); + tcp_done(sk); + } + spin_unlock_bh(lock); + } +} + #ifdef CONFIG_PROC_FS /* Proc filesystem TCP sock list dumping. */ |