Fw: [Bugme-new] [Bug 7665] New: getsockopt(IPV6_*CAST_HOPS) returns -1

[Andrew Morton <akpm@osdl.org>]

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Date: Mon, 11 Dec 2006 07:18:20 -0800
From: bugme-daemon@bugzilla.kernel.org
To: bugme-new@lists.osdl.org
Subject: [Bugme-new] [Bug 7665] New: getsockopt(IPV6_*CAST_HOPS) returns -1


http://bugzilla.kernel.org/show_bug.cgi?id=7665

           Summary: getsockopt(IPV6_*CAST_HOPS) returns -1
    Kernel Version: 2.6.19
            Status: NEW
          Severity: normal
             Owner: yoshfuji@linux-ipv6.org
         Submitter: rdenis@simphalempin.com


Most recent kernel where this bug did *NOT* occur: N/A
Distribution: Debian Sid
Hardware Environment: i386
Software Environment: glibc 2.3.6
Problem Description:

Where fd is a socket (datagram or raw) with IPv6 protocol family,
getsockopt(fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, ...) succeeds, but the returned 
hop limit is -1. connect()'ing the socket first does not solve the problem.

Same problem with IPV6_MULTICAST_HOPS.

Steps to reproduce:

Compile and run the following test case:

#include <sys/socket.h>
#include <netinet/in.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>

int main (void)
{
        int fd, val;
        socklen_t len = sizeof (val);
        struct sockaddr_in6 addr;

        memset (&addr, 0, sizeof (addr));
        fd = socket (AF_INET6, SOCK_RAW, IPPROTO_UDP);
        addr.sin6_family = AF_INET6;
        addr.sin6_addr.s6_addr[15] = 1;
        connect (fd, (struct sockaddr *)&addr, sizeof (addr));

        if (fd == -1) return 1;
        if (getsockopt (fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &val, &len) == 0)
                printf ("Default unicast hops limit: %d\n", val);
        if (getsockopt (fd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &val, &len) == 
0)
                printf ("Default multicast hops limit: %d\n", val);
        return 0;
}

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