Date: Sat, 20 Aug 2016 21:45:06 +0300 From: Slawa Olhovchenkov <slw@zxy.spb.ru> To: Ryan Stone <rysto32@gmail.com> 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: <20160820184506.GV8192@zxy.spb.ru> In-Reply-To: <CAFMmRNx=2v=M8GCBQ_cN4pnuZ4VnyzncwAgsqMUE=ebz7pkp2A@mail.gmail.com> 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> <CAFMmRNx=2v=M8GCBQ_cN4pnuZ4VnyzncwAgsqMUE=ebz7pkp2A@mail.gmail.com>
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On Sat, Aug 20, 2016 at 02:02:16PM -0400, Ryan Stone wrote: > 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. You also can recive this on ethernet too, IMHO, in case of /32. Receiving L3 broadcst in L2 unicast is legitime (IMHO) and we must be relaxed on this.
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