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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This is a cryptographically signed message in MIME format. --------------ms070006010709090100050103 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit 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 --------------ms070006010709090100050103 Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIJtjCC AzgwggKhoAMCAQICEGZFcrfMdPXPY3ZFhNAukQEwDQYJKoZIhvcNAQEEBQAwgdExCzAJBgNV BAYTAlpBMRUwEwYDVQQIEwxXZXN0ZXJuIENhcGUxEjAQBgNVBAcTCUNhcGUgVG93bjEaMBgG A1UEChMRVGhhd3RlIENvbnN1bHRpbmcxKDAmBgNVBAsTH0NlcnRpZmljYXRpb24gU2Vydmlj ZXMgRGl2aXNpb24xJDAiBgNVBAMTG1RoYXd0ZSBQZXJzb25hbCBGcmVlbWFpbCBDQTErMCkG CSqGSIb3DQEJARYccGVyc29uYWwtZnJlZW1haWxAdGhhd3RlLmNvbTAeFw0wMDA4MzAwMDAw MDBaFw0wNDA4MjcyMzU5NTlaMIGSMQswCQYDVQQGEwJaQTEVMBMGA1UECBMMV2VzdGVybiBD 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