[NETFILTER]: Drop conntrack reference when packet leaves IP (b31e5b1b) · Commits · 戴 / test

In the event a raw socket is created for sending purposes only, the creator never bothers to check the socket's receive queue. But we continue to add skbs to its queue until it fills up. Unfortunately, if ip_conntrack is loaded on the box, each skb we add to the queue potentially holds a reference to a conntrack. If the user attempts to unload ip_conntrack, we will spin around forever since the queued skbs are pinned. Signed-off-by:

Patrick McHardy <kaber@trash.net> Signed-off-by:

David S. Miller <davem@davemloft.net>

net/ipv4/ip_output.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -195,6 +195,8 @@ static inline int ip_finish_output2(struct sk_buff *skb)
		nf_debug_ip_finish_output2(skb);
		#endif /CONFIG_NETFILTER_DEBUG/

		nf_reset(skb);

		if (hh) {
		int hh_alen;

net/ipv4/netfilter/ip_conntrack_standalone.c

+0 −7

Original line number	Diff line number	Diff line
		@@ -431,13 +431,6 @@ static unsigned int ip_conntrack_defrag(unsigned int hooknum,
		const struct net_device *out,
		int (okfn)(struct sk_buff ))
		{
		#if !defined(CONFIG_IP_NF_NAT) && !defined(CONFIG_IP_NF_NAT_MODULE)
		/* Previously seen (loopback)? Ignore. Do this before
		fragment check. */
		if ((*pskb)->nfct)
		return NF_ACCEPT;
		#endif

		/* Gather fragments. */
		if ((*pskb)->nh.iph->frag_off & htons(IP_MF\|IP_OFFSET)) {
		pskb = ip_ct_gather_frags(pskb,

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