From a1d7c1b4b8dfbc5ecadcff9284d64bb6ad4c0196 Mon Sep 17 00:00:00 2001 From: Patrick McHardy Date: Fri, 14 May 2010 21:18:17 +0200 Subject: netfilter: nf_ct_sip: handle non-linear skbs Handle non-linear skbs by linearizing them instead of silently failing. Long term the helper should be fixed to either work with non-linear skbs directly by using the string search API or work on a copy of the data. Based on patch by Jason Gunthorpe Signed-off-by: Patrick McHardy --- net/netfilter/nf_conntrack_sip.c | 12 ++++-------- 1 file changed, 4 insertions(+), 8 deletions(-) (limited to 'net') diff --git a/net/netfilter/nf_conntrack_sip.c b/net/netfilter/nf_conntrack_sip.c index b20f427..53d8922 100644 --- a/net/netfilter/nf_conntrack_sip.c +++ b/net/netfilter/nf_conntrack_sip.c @@ -1393,10 +1393,8 @@ static int sip_help_tcp(struct sk_buff *skb, unsigned int protoff, nf_ct_refresh(ct, skb, sip_timeout * HZ); - if (skb_is_nonlinear(skb)) { - pr_debug("Copy of skbuff not supported yet.\n"); - return NF_ACCEPT; - } + if (unlikely(skb_linearize(skb))) + return NF_DROP; dptr = skb->data + dataoff; datalen = skb->len - dataoff; @@ -1455,10 +1453,8 @@ static int sip_help_udp(struct sk_buff *skb, unsigned int protoff, nf_ct_refresh(ct, skb, sip_timeout * HZ); - if (skb_is_nonlinear(skb)) { - pr_debug("Copy of skbuff not supported yet.\n"); - return NF_ACCEPT; - } + if (unlikely(skb_linearize(skb))) + return NF_DROP; dptr = skb->data + dataoff; datalen = skb->len - dataoff; -- cgit v1.1 From fc350777c705a39a312728ac5e8a6f164a828f5d Mon Sep 17 00:00:00 2001 From: Joerg Marx Date: Thu, 20 May 2010 15:55:30 +0200 Subject: netfilter: nf_conntrack: fix a race in __nf_conntrack_confirm against nf_ct_get_next_corpse() This race was triggered by a 'conntrack -F' command running in parallel to the insertion of a hash for a new connection. Losing this race led to a dead conntrack entry effectively blocking traffic for a particular connection until timeout or flushing the conntrack hashes again. Now the check for an already dying connection is done inside the lock. Signed-off-by: Joerg Marx Signed-off-by: Patrick McHardy --- net/netfilter/nf_conntrack_core.c | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'net') diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c index b83c530..eeeb8bc 100644 --- a/net/netfilter/nf_conntrack_core.c +++ b/net/netfilter/nf_conntrack_core.c @@ -424,6 +424,16 @@ __nf_conntrack_confirm(struct sk_buff *skb) spin_lock_bh(&nf_conntrack_lock); + /* We have to check the DYING flag inside the lock to prevent + a race against nf_ct_get_next_corpse() possibly called from + user context, else we insert an already 'dead' hash, blocking + further use of that particular connection -JM */ + + if (unlikely(nf_ct_is_dying(ct))) { + spin_unlock_bh(&nf_conntrack_lock); + return NF_ACCEPT; + } + /* See if there's one in the list already, including reverse: NAT could have grabbed it without realizing, since we're not in the hash. If there is, we lost race. */ -- cgit v1.1