mirror of https://github.com/hak5/openwrt.git
133 lines
3.9 KiB
Diff
133 lines
3.9 KiB
Diff
From 2df5996350da51bcdee798c00ae1f2415fd9ad20 Mon Sep 17 00:00:00 2001
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From: Robert Love <rlove@google.com>
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Date: Mon, 12 May 2008 17:08:29 -0400
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Subject: [PATCH 081/134] net: socket ioctl to reset connections matching local address
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Introduce a new socket ioctl, SIOCKILLADDR, that nukes all sockets
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bound to the same local address. This is useful in situations with
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dynamic IPs, to kill stuck connections.
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Signed-off-by: Brian Swetland <swetland@google.com>
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net: fix tcp_v4_nuke_addr
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Signed-off-by: Dima Zavin <dima@android.com>
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---
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include/linux/sockios.h | 1 +
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include/net/tcp.h | 2 ++
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net/ipv4/af_inet.c | 1 +
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net/ipv4/devinet.c | 9 ++++++++-
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net/ipv4/tcp_ipv4.c | 31 +++++++++++++++++++++++++++++++
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5 files changed, 43 insertions(+), 1 deletions(-)
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--- a/include/linux/sockios.h
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+++ b/include/linux/sockios.h
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@@ -65,6 +65,7 @@
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#define SIOCDIFADDR 0x8936 /* delete PA address */
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#define SIOCSIFHWBROADCAST 0x8937 /* set hardware broadcast addr */
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#define SIOCGIFCOUNT 0x8938 /* get number of devices */
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+#define SIOCKILLADDR 0x8939 /* kill sockets with this local addr */
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#define SIOCGIFBR 0x8940 /* Bridging support */
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#define SIOCSIFBR 0x8941 /* Set bridging options */
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--- a/include/net/tcp.h
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+++ b/include/net/tcp.h
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@@ -1381,6 +1381,8 @@ extern struct sk_buff **tcp4_gro_receive
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extern int tcp_gro_complete(struct sk_buff *skb);
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extern int tcp4_gro_complete(struct sk_buff *skb);
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+extern void tcp_v4_nuke_addr(__u32 saddr);
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+
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#ifdef CONFIG_PROC_FS
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extern int tcp4_proc_init(void);
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extern void tcp4_proc_exit(void);
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--- a/net/ipv4/af_inet.c
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+++ b/net/ipv4/af_inet.c
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@@ -825,6 +825,7 @@ int inet_ioctl(struct socket *sock, unsi
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case SIOCSIFPFLAGS:
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case SIOCGIFPFLAGS:
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case SIOCSIFFLAGS:
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+ case SIOCKILLADDR:
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err = devinet_ioctl(net, cmd, (void __user *)arg);
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break;
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default:
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--- a/net/ipv4/devinet.c
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+++ b/net/ipv4/devinet.c
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@@ -57,6 +57,7 @@
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#include <net/arp.h>
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#include <net/ip.h>
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+#include <net/tcp.h>
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#include <net/route.h>
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#include <net/ip_fib.h>
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#include <net/rtnetlink.h>
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@@ -631,6 +632,7 @@ int devinet_ioctl(struct net *net, unsig
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case SIOCSIFBRDADDR: /* Set the broadcast address */
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case SIOCSIFDSTADDR: /* Set the destination address */
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case SIOCSIFNETMASK: /* Set the netmask for the interface */
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+ case SIOCKILLADDR: /* Nuke all sockets on this address */
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ret = -EACCES;
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if (!capable(CAP_NET_ADMIN))
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goto out;
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@@ -680,7 +682,8 @@ int devinet_ioctl(struct net *net, unsig
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}
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ret = -EADDRNOTAVAIL;
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- if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS)
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+ if (!ifa && cmd != SIOCSIFADDR && cmd != SIOCSIFFLAGS
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+ && cmd != SIOCKILLADDR)
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goto done;
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switch (cmd) {
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@@ -804,6 +807,10 @@ int devinet_ioctl(struct net *net, unsig
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inet_insert_ifa(ifa);
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}
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break;
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+ case SIOCKILLADDR: /* Nuke all connections on this address */
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+ ret = 0;
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+ tcp_v4_nuke_addr(sin->sin_addr.s_addr);
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+ break;
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}
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done:
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rtnl_unlock();
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--- a/net/ipv4/tcp_ipv4.c
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+++ b/net/ipv4/tcp_ipv4.c
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@@ -1845,6 +1845,37 @@ void tcp_v4_destroy_sock(struct sock *sk
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EXPORT_SYMBOL(tcp_v4_destroy_sock);
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+/*
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+ * tcp_v4_nuke_addr - destroy all sockets on the given local address
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+ */
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+void tcp_v4_nuke_addr(__u32 saddr)
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+{
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+ unsigned int bucket;
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+
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+ for (bucket = 0; bucket < tcp_hashinfo.ehash_size; bucket++) {
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+ struct hlist_nulls_node *node;
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+ struct sock *sk;
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+ spinlock_t *lock = inet_ehash_lockp(&tcp_hashinfo, bucket);
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+
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+ spin_lock_bh(lock);
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+ sk_nulls_for_each(sk, node, &tcp_hashinfo.ehash[bucket].chain) {
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+ struct inet_sock *inet = inet_sk(sk);
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+
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+ if (inet->rcv_saddr != saddr)
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+ continue;
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+ if (sysctl_ip_dynaddr && sk->sk_state == TCP_SYN_SENT)
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+ continue;
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+ if (sock_flag(sk, SOCK_DEAD))
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+ continue;
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+
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+ sk->sk_err = ETIMEDOUT;
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+ sk->sk_error_report(sk);
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+ tcp_done(sk);
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+ }
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+ spin_unlock_bh(lock);
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+ }
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+}
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+
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#ifdef CONFIG_PROC_FS
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/* Proc filesystem TCP sock list dumping. */
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