Writing an OS X kernel extension to implement Linux's SO_BINDTODEVICE socket option

Question

I want to be able to force a socket through a specific network interface. In Linux the kernel allows a programmer to achieve this by setting said socket option - but in OS X I'm in the dark.

And hence my title question - is it possible? Has it been done? I'm not looking into re-implementing the IP stack, just enabling the usage of the bind-to-interface option.

And standard `bind(2)` with particular interface addres does not work for you? — Nikolai Fetissov, Sep 15 '12 at 19:05
@NikolaiNFetissov: Can you elaborate on bind(2). Is this API, command line utility or something else? — Victor Ronin, Dec 16 '13 at 16:30
Read the manual - `man 2 bind`. It's one of the fundamental network-related system calls. — Nikolai Fetissov, Dec 17 '13 at 00:24
bind() won't do me any good, as the system doesn't guarantee the call will bind the socket to a specific interface - but only to a specific address. — Dor, Jan 24 '14 at 13:20
And for raw sockets with IP_HDRINCL, the address you specified in bind or sendto is completely ignored. — youfu, Dec 12 '14 at 05:46

score -1 · Answer 1 · edited Oct 07 '21 at 06:26

-1

Use the RFC 3542 interface for selecting outgoing interfaces (IPV6_PKTINFO). https://www.rfc-editor.org/rfc/rfc3542#section-6

edited Oct 07 '21 at 06:26

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answered Apr 01 '15 at 16:22

cabo

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Writing an OS X kernel extension to implement Linux's SO_BINDTODEVICE socket option

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