Package: libtorrent13
Version: 0.12.7-6quickfix1
Severity: normal
Tags: ipv6
In Ubuntu 11.10 Oneiric Ocelot, with libtorrent13 0.12.7-6 and rtorrent
0.8.7-7ubuntu1, rtorrent no longer seems to set the TOS flag correctly
(throughput mode). This makes it difficult to set up good traffic shaping
rules.
The patch debian/patches/libtorrent-0.12.6-ipv6-07.patch in the package source
makes, amongst others, this change (in src/net/socket_fd.cc):
------------------------------------------------------------
bool
SocketFd::set_priority(priority_type p) {
check_valid();
int opt = p;
+#ifdef RAK_USE_INET6
+ if (m_ipv6_socket)
+ return setsockopt(m_fd, IPPROTO_IPV6, IPV6_TCLASS, &opt, sizeof(opt)) ==
0;
+ else
+#endif
return setsockopt(m_fd, IPPROTO_IP, IP_TOS, &opt, sizeof(opt)) == 0;
}
------------------------------------------------------------
By simply removing these five lines again, the TOS flag will be set correctly.
I only have a link-local ipv6 address, but apparently the ipv6 code is used
anyway. This paragraph from ipv6 (7) probably explains that:
IPv4 connections can be handled with the v6 API by using the v4-mapped-on-v6
address type; thus a program only needs to support this API type to support
both protocols. This is handled transparently by the address handling
functions in the C library.
It seems that the problem is that setting IPV6_TCLASS for an ipv4 connection
does not set the TOS flag correctly. I am, however, unsure what the proper
solution is here.
-- System Information:
Debian Release: wheezy/sid
APT prefers oneiric-updates
APT policy: (500, 'oneiric-updates'), (500, 'oneiric-security'), (500,
'oneiric')
Architecture: amd64 (x86_64)
Kernel: Linux 3.0.0-12-generic (SMP w/8 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Versions of packages libtorrent13 depends on:
ii libc6 2.13-20ubuntu5 Embedded GNU C Library: Shared lib
ii libgcc1 1:4.6.1-9ubuntu3 GCC support library
ii libsigc++-2.0-0c2a 2.2.10-0ubuntu1 type-safe Signal Framework for C++
ii libssl1.0.0 1.0.0e-2ubuntu4 SSL shared libraries
ii libstdc++6 4.6.1-9ubuntu3 GNU Standard C++ Library v3
libtorrent13 recommends no packages.
libtorrent13 suggests no packages.
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