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pfil4_wrapper, pfil6_wrapper:

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ensure that mbufs are writable beforehand as pf assumes it.
PR/26433.
This commit is contained in:
yamt 2004-09-06 10:01:39 +00:00
parent d73bcfeb33
commit 421ffa4969
1 changed files with 28 additions and 1 deletions
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29
sys/dist/pf/net/pf_ioctl.c vendored
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@ -1,4 +1,4 @@
/* $NetBSD: pf_ioctl.c,v 1.9 2004/07/27 12:22:59 yamt Exp $ */
/* $NetBSD: pf_ioctl.c,v 1.10 2004/09/06 10:01:39 yamt Exp $ */
/* $OpenBSD: pf_ioctl.c,v 1.112 2004/03/22 04:54:18 mcbride Exp $ */
/*
@ -2761,6 +2761,20 @@ fail:
int
pfil4_wrapper(void *arg, struct mbuf **mp, struct ifnet *ifp, int dir)
{
int error;
/*
* ensure that mbufs are writable beforehand
* as it's assumed by pf code.
* ip hdr (60 bytes) + tcp hdr (60 bytes) should be enough.
* XXX inefficient
*/
error = m_makewritable(mp, 0, 60 + 60, M_DONTWAIT);
if (error) {
m_freem(*mp);
*mp = NULL;
return error;
}
/*
* If the packet is out-bound, we can't delay checksums
@ -2787,6 +2801,19 @@ pfil4_wrapper(void *arg, struct mbuf **mp, struct ifnet *ifp, int dir)
int
pfil6_wrapper(void *arg, struct mbuf **mp, struct ifnet *ifp, int dir)
{
int error;
/*
* ensure that mbufs are writable beforehand
* as it's assumed by pf code.
* XXX inefficient
*/
error = m_makewritable(mp, 0, M_COPYALL, M_DONTWAIT);
if (error) {
m_freem(*mp);
*mp = NULL;
return error;
}
if (pf_test6(dir == PFIL_OUT ? PF_OUT : PF_IN, ifp, mp) != PF_PASS) {
m_freem(*mp);