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Date:	Sat, 1 Sep 2007 18:04:16 +0300 (EEST)
From:	Meelis Roos <>
To:	Patrick McHardy <>
	Netfilter Development Mailinglist 
Subject: Re: ipv4_get_l4proto: Frag of proto 17

> I'm guessing that its ICMP errors containing UDP fragments.
> Could you add a WARN_ON(1) to ipv4_get_l4proto() in
> net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c to verify
> this?

Yes, it seems to be an ICMP error:

WARNING: at net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c:93 ipv4_get_l4proto()
 [<c0103447>] show_trace_log_lvl+0x1a/0x2f
 [<c0103f2e>] show_trace+0x12/0x14
 [<c0103f45>] dump_stack+0x15/0x17
 [<f8cc60fc>] ipv4_get_l4proto+0x78/0xc0 [nf_conntrack_ipv4]
 [<f8d14fc4>] nf_ct_get_tuplepr+0x45/0xae [nf_conntrack]
 [<f8cc6777>] icmp_error+0x185/0x1f6 [nf_conntrack_ipv4]
 [<f8d1548f>] nf_conntrack_in+0xc0/0x409 [nf_conntrack]
 [<f8cc6251>] ipv4_conntrack_in+0x11/0x13 [nf_conntrack_ipv4]
 [<c028f16e>] nf_iterate+0x36/0x67
 [<c028f519>] nf_hook_slow+0x57/0xd6
 [<c0294a97>] ip_rcv+0x1d9/0x489
 [<c027a38e>] netif_receive_skb+0x2c9/0x34a
 [<f88ca79d>] rtl8139_poll+0x2a5/0x410 [8139too]
 [<c027bfa4>] net_rx_action+0x56/0xd5
 [<c011af47>] __do_softirq+0x38/0x7a
 [<c01048e5>] do_softirq+0x41/0x91
ipv4_get_l4proto: Frag of proto 17

Meelis Roos (
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