netdev - IPV6_V6ONLY ignored for SCTP

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Date:	Sun, 18 May 2008 12:58:55 +0200 (CEST)
From:	Jan Engelhardt <jengelh@...ozas.de>
To:	netdev@...r.kernel.org
Subject: IPV6_V6ONLY ignored for SCTP

Hi,


with the following short C program, I get "Address already in use"
(when binding 'b'), but only when using IPPROTO_SCTP. When I use 
IPPROTO_TCP for 'a' and 'b', everything is fine. Seems like SCTP
is ignoring the V6ONLY flag.
Running kernel is 2.6.25.3 on i686. Any other info needed?

Thanks,
Jan

--<<---
#include <arpa/inet.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <stdio.h>
#define p(x) if ((x) < 0) perror("urgh")
int main(void)
{
	int a, b, y = 1;
	p(a = socket(PF_INET, SOCK_STREAM, IPPROTO_SCTP));
	p(b = socket(PF_INET6, SOCK_STREAM, IPPROTO_SCTP));
	p(setsockopt(b, IPPROTO_IPV6, IPV6_V6ONLY, &y, sizeof(y)));
	p(bind(a, (const void *)&(struct sockaddr_in){.sin_family = PF_INET,
		.sin_port = htons(3333)}, sizeof(struct sockaddr_in)));
	p(listen(a, SOMAXCONN));
	p(bind(b, (const void *)&(struct sockaddr_in6){.sin6_family = PF_INET6,
		.sin6_port = htons(3333)}, sizeof(struct sockaddr_in6)));
	p(listen(b, SOMAXCONN));
	return 0;
}
--
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