From owner-freebsd-bugs  Mon Dec 31 14:43:21 2001
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From: "June Carey" <carey_june@hotmail.com>
To: bugs@freebsd.org
Subject: FreeBSD-4.3 IPv6 bug
Date: Mon, 31 Dec 2001 22:43:18 +0000
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Hi,

I've tried and failed to send this problem-report in a few times,
so here it comes for the umpteenth time:


Hi,

I seem to have discovered a kernel/networking bug in FreeBSD-4.3:

I have written an IPv6 SOCK_STREAM listening server, which can handle IPv4
and IPv6 connections. However, when the server is operating with an
IPv6 listening socket, and accepts a new IPv4 connection,
accept(2) fills in the address structure (a union of sockaddr_in and
sockaddr_in6) with a "sin_family" of 28 (AF_INET6). Surely it should be 2
(AF_INET). I have checked with a netstat -a to make sure it is actually a
IPv4 connection. I am 100% positive that there is no mistake in my
programming; for example when I run the server in IPv4 "mode",
accept(2) correctly fills in the address structure with a "sin_family" of
2. And BTW when the server is running in IPv4 mode I get connection
refused when I try to connect with a IPv6 socket.

Cheers,
Robin

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