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Date: Tue, 27 Mar 2007 14:47:54 -0700
From: dagriego@...il.com (David Griego)
To: davem@...emloft.ne
Cc: netdev@...r.kernel.org
Subject: [PATCH] NET: Add TCP connection abort IOCTL
Adds an IOCTL for aborting established TCP connections, and is
designed to be an HA performance improvement for cleaning up, failure
notification, and application termination.
Signed-off-by: David Griego <dagriego@...il.com>
---
include/linux/ipv6.h | 8 ++++
include/linux/socket.h | 5 ++
include/linux/sockios.h | 1
include/net/inet_hashtables.h | 6 +++
net/ipv4/tcp.c | 15 +++++++
net/ipv4/tcp_ipv4.c | 86 +++++++++++++++++++++++++++++++++++++++++
6 files changed, 121 insertions(+), 0 deletions(-)
---
diff --git a/include/linux/ipv6.h b/include/linux/ipv6.h
index f824113..42f6765 100644
--- a/include/linux/ipv6.h
+++ b/include/linux/ipv6.h
@@ -467,6 +467,14 @@ #define INET6_MATCH(__sk, __hash, __sadd
ipv6_addr_equal(&inet6_sk(__sk)->rcv_saddr, (__daddr)) && \
(!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
+#define TCP_IPV6_WILDCARD_MATCH(__sk, __saddr, __sport,__daddr, __dport) \
+ ((ipv6_addr_any(&__saddr) || \
+ ipv6_addr_equal(&__saddr, &inet6_sk(__sk)->saddr)) && \
+ ((!__sport) || (ntohs(__sport) == inet_sk(__sk)->num)) && \
+ (ipv6_addr_any(&__daddr) || \
+ ipv6_addr_equal(&__daddr, &inet6_sk(__sk)->daddr)) && \
+ ((!__dport) || (__dport == inet_sk(__sk)->dport)))
+
#endif /* __KERNEL__ */
#endif /* _IPV6_H */
diff --git a/include/linux/socket.h b/include/linux/socket.h
index fcd35a2..0bf7b0a 100644
--- a/include/linux/socket.h
+++ b/include/linux/socket.h
@@ -48,6 +48,11 @@ struct linger {
#define sockaddr_storage __kernel_sockaddr_storage
+struct tcp_abort_sockaddr_storage {
+ struct sockaddr_storage local; /* local address for lookup */
+ struct sockaddr_storage remote; /* Remote address for lookup */
+};
+
/*
* As we do 4.4BSD message passing we use a 4.4BSD message passing
* system, not 4.3. Thus msg_accrights(len) are now missing. They
diff --git a/include/linux/sockios.h b/include/linux/sockios.h
index abef759..b850577 100644
--- a/include/linux/sockios.h
+++ b/include/linux/sockios.h
@@ -140,4 +140,5 @@ #define SIOCDEVPRIVATE 0x89F0 /* to 89FF
*/
#define SIOCPROTOPRIVATE 0x89E0 /* to 89EF */
+#define SIOCABORTCONN SIOCPROTOPRIVATE + 1
#endif /* _LINUX_SOCKIOS_H */
diff --git a/include/net/inet_hashtables.h b/include/net/inet_hashtables.h
index d27ee8c..735739a 100644
--- a/include/net/inet_hashtables.h
+++ b/include/net/inet_hashtables.h
@@ -339,6 +339,12 @@ #define INET_TW_MATCH(__sk, __hash,__coo
(!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
#endif /* 64-bit arch */
+#define TCP_IPV4_WILDCARD_MATCH(__sk, __saddr, __sport,__daddr, __dport) \
+ (((__saddr == INADDR_ANY) || (__saddr == inet_sk(__sk)->saddr)) && \
+ ((!__sport) || (ntohs(__sport) == inet_sk(__sk)->num)) && \
+ ((__daddr == INADDR_ANY) || (__daddr == inet_sk(__sk)->daddr)) && \
+ ((!__dport) || (__dport == inet_sk(__sk)->dport)))
+
/*
* Sockets in TCP_CLOSE state are _always_ taken out of the hash, so we need
* not check it for lookups anymore, thanks Alexey. -DaveM
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 3834b10..b3e7a6f 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -442,6 +442,21 @@ int tcp_ioctl(struct sock *sk, int cmd,
else
answ = tp->write_seq - tp->snd_una;
break;
+ case SIOCABORTCONN:
+ {
+ struct tcp_abort_sockaddr_storage tcp_abort;
+ void __user *data = (void __user *)arg;
+
+ if (!capable(CAP_NET_ADMIN)){
+ return -EACCES;
+ }
+
+ /* Check permissions */
+ if (copy_from_user(&tcp_abort, data, sizeof(tcp_abort))) {
+ return -EFAULT;
+ }
+ return tcp_handle_abort_req(&tcp_abort.local, &tcp_abort.remote);
+ }
default:
return -ENOIOCTLCMD;
};
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 0ba74bb..add483b 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -123,6 +123,91 @@ void tcp_unhash(struct sock *sk)
inet_unhash(&tcp_hashinfo, sk);
}
+int tcp_handle_abort_req(struct sockaddr_storage *local,
+ struct sockaddr_storage *remote)
+{
+ int i, ret = -ENOENT;
+
+ /* Check for supported address families */
+ if((local->ss_family != remote->ss_family) ||
+ ((local->ss_family != AF_INET) && (local->ss_family != AF_INET6)))
+ return -EINVAL;
+
+ local_bh_disable();
+
+ /* cycle through all the established connecton buckets */
+ for (i = 0; i < tcp_hashinfo.ehash_size; ++i) {
+ struct sock *sk;
+ struct hlist_node *node;
+restart_bucket:
+
+ read_lock(&tcp_hashinfo.ehash[i].lock);
+ sk_for_each(sk, node, &tcp_hashinfo.ehash[i].chain) {
+ if (sk->sk_family != local->ss_family) {
+ continue;
+ }
+
+ switch(local->ss_family) {
+ case AF_INET:
+ {
+ struct sockaddr_in *ipv4_local =
+ (struct sockaddr_in *)local;
+ struct sockaddr_in *ipv4_remote =
+ (struct sockaddr_in *)remote;
+
+ if(TCP_IPV4_WILDCARD_MATCH(sk,
+ ipv4_local->sin_addr.s_addr,
+ ipv4_local->sin_port,
+ ipv4_remote->sin_addr.s_addr,
+ ipv4_remote->sin_port))
+ break;
+ continue;
+ }
+#ifdef CONFIG_IPV6
+ case AF_INET6:
+ {
+ struct sockaddr_in6 *ipv6_local =
+ (struct sockaddr_in6 *)local;
+ struct sockaddr_in6 *ipv6_remote =
+ (struct sockaddr_in6 *)remote;
+
+ if(TCP_IPV6_WILDCARD_MATCH(sk,
+ ipv6_local->sin6_addr,
+ ipv6_local->sin6_port,
+ ipv6_remote->sin6_addr,
+ ipv6_remote->sin6_port))
+ break;
+ continue;
+ }
+#endif /*CONFIG_IPV6 */
+ default: /* Not a supported address family */
+ continue;
+ }
+
+ /* Found a match so kill it */
+ ret = 0;
+ sock_hold(sk);
+ read_unlock(&tcp_hashinfo.ehash[i].lock);
+ local_bh_enable();
+ tcp_disconnect(sk, O_NONBLOCK);
+ local_bh_disable();
+ sock_put(sk);
+
+ /* Broke link and let go of the list lock, so restart
+ * our search for matches at the begining of this
+ * hash bucket
+ */
+ goto restart_bucket;
+ }
+
+ read_unlock(&tcp_hashinfo.ehash[i].lock);
+ }
+
+ local_bh_enable();
+
+ return ret;
+}
+
static inline __u32 tcp_v4_init_sequence(struct sk_buff *skb)
{
return secure_tcp_sequence_number(skb->nh.iph->daddr,
@@ -2462,6 +2547,7 @@ EXPORT_SYMBOL(ipv4_specific);
EXPORT_SYMBOL(tcp_hashinfo);
EXPORT_SYMBOL(tcp_prot);
EXPORT_SYMBOL(tcp_unhash);
+EXPORT_SYMBOL(tcp_handle_abort_req);
EXPORT_SYMBOL(tcp_v4_conn_request);
EXPORT_SYMBOL(tcp_v4_connect);
EXPORT_SYMBOL(tcp_v4_do_rcv);
--
1.4.1
-
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