Re: ipfw: pullup failed
From: Eugene Grosbein (eugen_at_kuzbass.ru)
Date: 11/25/03
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Date: Tue, 25 Nov 2003 20:38:36 +0700 To: Luigi Rizzo <rizzo@icir.org>
Luigi Rizzo wrote:
> > > > My router that uses ipfw2 for WF2Q+ sometimes writes in log:
> > > > Sep 15 10:14:38 gw2 /kernel: ipfw: pullup failed
> > > > Sep 15 11:50:53 gw2 /kernel: ipfw: pullup failed
> > >
> > > a possibility is that it has run out of mbufs. what does netstat -m say ?
> >
> > 669/1920/65536 mbufs in use (current/peak/max):
> > 654 mbufs allocated to data
> > 15 mbufs allocated to packet headers
> > 472/712/16384 mbuf clusters in use (current/peak/max)
>
> ok, another one is that the packet was too short for the desired
> length (supposedly, as a result of a collision).
> You could perhaps try the following patch and see if it tells you
> something more interesting.
>
> static int
> ipfw_chk(struct ip_fw_args *args)
> {
> + int desired_len = -1;
> /*
> * Local variables hold state during the processing of a packet.
> *
> * IMPORTANT NOTE: to speed up the processing of rules, there
>
> ...
>
> #define PULLUP_TO(len) \
> do { \
> if ((m)->m_len < (len)) { \
> args->m = m = m_pullup(m, (len)); \
> - if (m == 0) \
> + if (m == 0) { \
> + desired_len = (len); \
> goto pullup_failed; \
> + } \
> ip = mtod(m, struct ip *); \
> } \
> } while (0)
>
> ...
> pullup_failed:
> if (fw_verbose)
> - printf("pullup failed\n");
> + printf("pullup failed have %d want %d\n", m->m_len,desired_len);
> return(IP_FW_PORT_DENY_FLAG);
> }
I've upgraded my router to 4.9-STABLE and applied your patch.
Well, it produces something interesting. It produces kernel panic
because m once became NULL in this printf :-)
Eugene Grosbein
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