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Date:      Sat, 20 Aug 2016 14:02:16 -0400
From:      Ryan Stone <rysto32@gmail.com>
To:        Slawa Olhovchenkov <slw@zxy.spb.ru>
Cc:        Bruce Simpson <bms@fastmail.net>, "svn-src-head@freebsd.org" <svn-src-head@freebsd.org>,  Ryan Stone <rstone@freebsd.org>,  "src-committers@freebsd.org" <src-committers@freebsd.org>,  "svn-src-all@freebsd.org" <svn-src-all@freebsd.org>, Adrian Chadd <adrian@freebsd.org>
Subject:   Re: svn commit: r304436 - in head: . sys/netinet
Message-ID:  <CAFMmRNx=2v=M8GCBQ_cN4pnuZ4VnyzncwAgsqMUE=ebz7pkp2A@mail.gmail.com>
In-Reply-To: <20160820173050.GQ22212@zxy.spb.ru>
References:  <201608182259.u7IMx5oW002018@repo.freebsd.org> <4fbc2e1d-3a62-5963-83d5-f9c931503e51@fastmail.net> <3806700d-ed27-7915-4818-c2d64f7b806d@fastmail.net> <CAFMmRNyi=PwE9pc9_8wCU63=HttUzFR4Zh2v=uHKcQ-zaLxdJQ@mail.gmail.com> <fcb33eac-ec99-03c7-57b5-f24f86c4f41a@fastmail.net> <CAFMmRNwDPy4Hd35DrfREZQzjvd89qw=zhEriddG8U8NV7tD=EA@mail.gmail.com> <6f4449f2-d145-8b49-c3f0-433e8ff4d2a2@fastmail.net> <CAFMmRNypgJc00XH277oB3EEGje4xq%2B8_qcJfZu4jjBfTfa7GGQ@mail.gmail.com> <20160820173050.GQ22212@zxy.spb.ru>

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On Sat, Aug 20, 2016 at 1:30 PM, Slawa Olhovchenkov <slw@zxy.spb.ru> wrote:

> For host enought have [hidden] alias with broadcsts bits.
> Anyway, don't should relay on the L2 information, you can recive L3
> unicast addressed packets (with alien dst IP address) in L2 broadcas
> packet.
>

This is still handled correctly.  The new code only checks for L3 broadcast
addresses on L2 broadcast packets, but we still check the L3 address before
treating it as a broadcast. The problem is that I assumed that all paths
into the IP stack would set M_BCAST, but as Bruce has pointed out there are
cases like PPP which do not.



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