"Bhaskara Peela" <bpeela@xxxxxxxxxxxx> wrote on 09/19/2006 12:17:22 PM:
> Hi,
>
> Thank you for your quick reply. It works with IP_ADD_MEMBERSHIP. But, I
> don't understand why we need IP_ADD_MEMBERSHIP before IP_MSFILTER as we
> can do everything with IP_MSFILTER. I feel IP_MSFILTER is more
> versatile than other basic API.
This API modifies filters; it doesn't join the group for you. It's
not unreasonable to have it automatically join, but that effectively
ignores some potential error conditions (like trying to leave a group
you for which you are not a member, as your code was doing). Of course,
if you want to, your code can always join and ignore the error when
you're already a member. The kernel interface separates join and
filter modification operations.
> As you mentioned it does not work with nsrcs=0 but, works with any
> non-zero value of nsrcs include and exclude filters. Is there any
> documentation which gives brief description of usage of this API
> sequence. If I use nsrcs=0 option I still get "Cannot assign requested
> address". I am using 2.6.9 kernel. I will try with the 2.6.16 kernel
> and see what happens?
2.6.9 is more than a year old, and there has been a lot of work
in this area since then.
> BTW, do you know the status of setipv4sourcefilter()/setsourcefilter()
> API? They are not there in latest release?
These are provided by glibc, not the kernel. If you get a recent
version of glibc, they should be there. The Linux kernel interface for
full-state multicast source filtering is IP_MSFILTER, which the glibc
implementation of setipv4sourcefilter()/setsourcefilter() uses.
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