netdev - Re: [IPv6] "sendmsg: invalid argument" to multicast group after some time

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Date:	Mon, 1 Sep 2008 20:57:51 +0300 (EEST)
From:	Pekka Savola <pekkas@...core.fi>
To:	Bernhard Schmidt <berni@...kenwald.de>
cc:	David Stevens <dlstevens@...ibm.com>, netdev@...r.kernel.org
Subject: Re: [IPv6] "sendmsg: invalid argument" to multicast group after some
 time

On Mon, 1 Sep 2008, Bernhard Schmidt wrote:
> sendmsg(3, {msg_name(28)={sa_family=AF_INET6, sin6_port=htons(58), 
> inet_pton(AF_INET6, "ff02::2", &sin6_addr), sin6_flowinfo=0, 
> sin6_scope_id=0}, 
> msg_iov(1)=[{"\200\0\0\0004x\0\1\22\37\274H\366\v\5\0\10\t\n\v\f\r\16\17\20\21\22\23\24\25\26\27\30"..., 
> 64}], msg_controllen=32, {cmsg_len=32, cmsg_level=SOL_IPV6, 
> cmsg_type=, ...}, 
> msg_flags=MSG_PEEK|MSG_PROXY|MSG_WAITALL|MSG_CONFIRM|MSG_FIN|MSG_SYN|MSG_RST|MSG_CMSG_CLOEXEC|0x8bc0000}, 
> 0) = 64

versus:

> sendmsg(3, {msg_name(28)={sa_family=AF_INET6, sin6_port=htons(58), 
> inet_pton(AF_INET6, "ff02::9", &sin6_addr), sin6_flowinfo=0, 
> sin6_scope_id=0}, 
> msg_iov(1)=[{"\200\0\0\0Sx\0\1/\37\274H\354\212\n\0\10\t\n\v\f\r\16\17\20\21\22\23\24\25\26\27\30"..., 
> 64}], msg_controllen=32, {cmsg_len=32, cmsg_level=SOL_IPV6, 
> cmsg_type=, ...}, msg_flags=MSG_CTRUNC}, 0) = -1 EINVAL (Invalid 
> argument)

It seems that in the latter case, you haven't specified the interface 
(sin6_scope_id=0), but in the former case you have.  You can't send to 
link-local multicast groups if you have multiple interface if the 
interface isn't specified.

-- 
Pekka Savola                 "You each name yourselves king, yet the
Netcore Oy                    kingdom bleeds."
Systems. Networks. Security. -- George R.R. Martin: A Clash of Kings
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