K 10
svn:author
V 2
kp
K 8
svn:date
V 27
2022-02-28T15:40:32.596947Z
K 7
svn:log
V 688
bridge: Don't share broadcast packets

if_bridge duplicates broadcast packets with m_copypacket(), which
creates shared packets. In certain circumstances these packets can be
processed by udp_usrreq.c:udp_input() first, which modifies the mbuf as
part of the checksum verification. That may lead to incorrect packets
being transmitted.

Use m_dup() to create independent mbufs instead.

Reported by:	Richard Russo <toast@ruka.org>
Reviewed by:	donner, afedorov
MFC after:	2 weeks
Differential Revision:	https://reviews.freebsd.org/D34319

(cherry picked from commit 36637dd19dba79088e53c6f2aa026415eae9f8f0)

Git Hash:   6929fea00dddb78053403d8a674b3bda6a91fd47
Git Author: kp@FreeBSD.org
END