Date: Wed, 20 Aug 2003 10:29:33 -0700 From: Lars Eggert <larse@ISI.EDU> To: Sam Leffler <sam@errno.com> Cc: freebsd-arch@freebsd.org Subject: Re: CFR: bridge locking Message-ID: <3F43AFFD.6080504@isi.edu> In-Reply-To: <510776858.1061372094@melange.errno.com> References: <510776858.1061372094@melange.errno.com>
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[-- Attachment #1 --] Sam Leffler wrote: > http://www.freebsd.org/~sam/bridge.patch > > This patch adds locking and also overhauls the bridge code some to do > things like replace explicit numbers with #defines and cleanup the > debugging code. This is only mildly related, but maybe someone feels like looking at this in addition to your locking changes... I have a PR about the bridge code sitting at http://www.freebsd.org/cgi/query-pr.cgi?pr=kern/41632; the latest patch is at http://www.isi.edu/larse/software/bridge.patch It does two things: 1. Disables bridging for IPv6. This is probably too aggressive, since bridging is only problematic for link-local packets, but it makes a routed IPv6 configuration coexist with a bridged IPv4 one. A much better fix would be an overhaul of the bridge code so that each bridge has a single link-local address, instead of one per physical interface. (Similar to how it should/must only have one IPv4 address, but link-locals are auto-assigned.) Essentially, make a bridge set its own pseudo interface. 2. It forwards a copy of bridged packets to bpfs attached to interfaces in the bridge set that have no carrier. This makes dhcpd work on an interface of a bridge set that is unplugged. Again, a much better fix would be to have bridge sets show up as pseudo interfaces that dhcpd's bpf can then listen on. I think you mentioned in the past that NetBSD (OpenBSD?) has bridge code that implements the pseudo-device approach? Lars PS: I needed both these changes for our Soekris-based "rent-a-subnet" box: http://www.isi.edu/tethernet/ -- Lars Eggert <larse@isi.edu> USC Information Sciences Institute [-- Attachment #2 --] 0 *H 01 0 + 0 *H 080fErtcvE.0 *H 01 0 UZA10U Western Cape10U Cape Town10U Thawte Consulting1(0&U Certification Services Division1$0"UThawte Personal Freemail CA1+0) *H personal-freemail@thawte.com0 000830000000Z 040827235959Z01 0 UZA10U Western Cape10U Cape Town10 U Thawte1 0U Certificate Services1(0&U Personal Freemail RSA 2000.8.3000 *H 0 32c %E>nx'gڈD)c5*mp<ܮto034qmOe KaU5u'rװ |CBPQ<9TIf - ki N0L0)U "0 0 10UPrivateLabel1-2970U 0 0 U 0 *H 1KG]qSl]y=&b""I'{9$ *8PUl LGl X1B li+@]jy.%݊ Z<D&iHΥbb090 vo0 *H 01 0 UZA10U Western Cape10U Cape Town10 U Thawte1 0U Certificate Services1(0&U Personal Freemail RSA 2000.8.300 030801172929Z 040731172929Z0T10 UEggert1 0 U*Lars10U Lars Eggert1 0 *H larse@isi.edu0"0 *H 0 >ן~H(ԢGV׆־25B03ݰת^RIH =%J kA^R)y H80P ~qrU|c~\;ҋ^哪 !֍ &d@Cd"O"f$FrGe|r<z"%h+Z`3<}̘}9ʮcnb6RX ٫e~XgK7,ìEYU? V0T0*+e!0 00L2uMyffBNUbNJJcdZ2s0U 0 larse@isi.edu0 U 0 0 *H 5Kkt[@ jj:Fg Xj (8yPo!})5M[ ش]wʼnQd!GyFRiKd!8h\7γSD`a[qiY+Gqn?!090 vo0 *H 01 0 UZA10U Western Cape10U Cape Town10 U Thawte1 0U Certificate Services1(0&U Personal Freemail RSA 2000.8.300 030801172929Z 040731172929Z0T10 UEggert1 0 U*Lars10U Lars Eggert1 0 *H larse@isi.edu0"0 *H 0 >ן~H(ԢGV׆־25B03ݰת^RIH =%J kA^R)y H80P ~qrU|c~\;ҋ^哪 !֍ &d@Cd"O"f$FrGe|r<z"%h+Z`3<}̘}9ʮcnb6RX ٫e~XgK7,ìEYU? V0T0*+e!0 00L2uMyffBNUbNJJcdZ2s0U 0 larse@isi.edu0 U 0 0 *H 5Kkt[@ jj:Fg Xj (8yPo!})5M[ ش]wʼnQd!GyFRiKd!8h\7γSD`a[qiY+Gqn?!10001 0 UZA10U Western Cape10U Cape Town10 U Thawte1 0U Certificate Services1(0&U Personal Freemail RSA 2000.8.30 vo0 + 0 *H 1 *H 0 *H 1 030820172933Z0# *H 10Z^⨕eR-h_3NL0R *H 1E0C0 *H 0*H 0 *H @0+0 *H (0 +71001 0 UZA10U Western Cape10U Cape Town10 U Thawte1 0U Certificate Services1(0&U Personal Freemail RSA 2000.8.30 vo0 *H 101 0 UZA10U Western Cape10U Cape Town10 U Thawte1 0U Certificate Services1(0&U Personal Freemail RSA 2000.8.30 vo0 *H vI'\kX![.W7U.&#z&=a+ =;]!~?d]W##-*; p+N^JtK}͒;ҀP)Do n>̣aA }Dѽ/Puo{G ϣ:z &l2ḮG#+Y =H6f`s-H u~$B)Rx6fBȠ 4=<j
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