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| author | Balazs Scheidler <bazsi@balabit.hu> | 2010-10-21 13:06:43 +0200 |
|---|---|---|
| committer | Patrick McHardy <kaber@trash.net> | 2010-10-21 13:06:43 +0200 |
| commit | 093d282321daeb19c107e5f1f16d7f68484f3ade (patch) | |
| tree | 36e9eed23573068819bf67a91caac6ebf60d0d7c /net/ipv6/tcp_ipv6.c | |
| parent | 6006db84a91838813cdad8a6622a4e39efe9ea47 (diff) | |
| download | lwn-093d282321daeb19c107e5f1f16d7f68484f3ade.tar.gz lwn-093d282321daeb19c107e5f1f16d7f68484f3ade.zip | |
tproxy: fix hash locking issue when using port redirection in __inet_inherit_port()
When __inet_inherit_port() is called on a tproxy connection the wrong locks are
held for the inet_bind_bucket it is added to. __inet_inherit_port() made an
implicit assumption that the listener's port number (and thus its bind bucket).
Unfortunately, if you're using the TPROXY target to redirect skbs to a
transparent proxy that assumption is not true anymore and things break.
This patch adds code to __inet_inherit_port() so that it can handle this case
by looking up or creating a new bind bucket for the child socket and updates
callers of __inet_inherit_port() to gracefully handle __inet_inherit_port()
failing.
Reported by and original patch from Stephen Buck <stephen.buck@exinda.com>.
See http://marc.info/?t=128169268200001&r=1&w=2 for the original discussion.
Signed-off-by: KOVACS Krisztian <hidden@balabit.hu>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Diffstat (limited to 'net/ipv6/tcp_ipv6.c')
| -rw-r--r-- | net/ipv6/tcp_ipv6.c | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c index fe6d40418c0b..ba5258ef1c57 100644 --- a/net/ipv6/tcp_ipv6.c +++ b/net/ipv6/tcp_ipv6.c @@ -1409,7 +1409,7 @@ static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb, newsk = tcp_create_openreq_child(sk, req, skb); if (newsk == NULL) - goto out; + goto out_nonewsk; /* * No need to charge this sock to the relevant IPv6 refcnt debug socks @@ -1497,18 +1497,22 @@ static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb, } #endif + if (__inet_inherit_port(sk, newsk) < 0) { + sock_put(newsk); + goto out; + } __inet6_hash(newsk, NULL); - __inet_inherit_port(sk, newsk); return newsk; out_overflow: NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); -out: - NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); +out_nonewsk: if (opt && opt != np->opt) sock_kfree_s(sk, opt, opt->tot_len); dst_release(dst); +out: + NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); return NULL; } |