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Evaluate packet size after the firewall had its chance in the ip6 fast path

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Defer the packet size check until after the firewall has had a look at it. This
means that the firewall now has the opportunity to (re-)fragment an oversized
packet.
This mirrors what the slow path does.

Reviewed by:	ae
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D12779
This commit is contained in:
Kristof Provost 2017-10-25 19:21:48 +00:00
parent 7562d7ddbd
commit a0bf3ee425
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=324996
1 changed files with 10 additions and 8 deletions
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18
sys/netinet6/ip6_fastfwd.c
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@ -194,6 +194,16 @@ ip6_tryforward(struct mbuf *m)
in6_ifstat_inc(rcvif, ifs6_in_noroute);
goto dropin;
}
/*
* Outgoing packet firewall processing.
*/
if (!PFIL_HOOKED(&V_inet6_pfil_hook))
goto passout;
if (pfil_run_hooks(&V_inet6_pfil_hook, &m, nh.nh_ifp, PFIL_OUT,
NULL) != 0 || m == NULL)
goto dropout;
/*
* We used slow path processing for packets with scoped addresses.
* So, scope checks aren't needed here.
@ -205,14 +215,6 @@ ip6_tryforward(struct mbuf *m)
goto dropout;
}
/*
* Outgoing packet firewall processing.
*/
if (!PFIL_HOOKED(&V_inet6_pfil_hook))
goto passout;
if (pfil_run_hooks(&V_inet6_pfil_hook, &m, nh.nh_ifp, PFIL_OUT,
NULL) != 0 || m == NULL)
goto dropout;
/*
* If packet filter sets the M_FASTFWD_OURS flag, this means
* that new destination or next hop is our local address.