Date: Sun, 15 Jul 2012 17:44:28 +0000 (UTC) From: "Alexander V. Chernikov" <melifaro@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r238492 - head/sys/net Message-ID: <201207151744.q6FHiSSf061385@svn.freebsd.org>
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Author: melifaro Date: Sun Jul 15 17:44:27 2012 New Revision: 238492 URL: http://svn.freebsd.org/changeset/base/238492 Log: Permit changing MTU in 6to4 relay. This behavior is recommended by RFC 4213 clause 3.2. Sometimes fragmentation is the least evil. For example, some Linux IPVS kernels forwards ICMPv6 checksums to real servers incorrectly. Reviewed by: hrs(previous version) Approved by: kib(mentor) MFC after: 1 week Modified: head/sys/net/if_stf.c Modified: head/sys/net/if_stf.c ============================================================================== --- head/sys/net/if_stf.c Sun Jul 15 15:50:12 2012 (r238491) +++ head/sys/net/if_stf.c Sun Jul 15 17:44:27 2012 (r238492) @@ -793,7 +793,7 @@ stf_rtrequest(cmd, rt, info) struct rt_addrinfo *info; { RT_LOCK_ASSERT(rt); - rt->rt_rmx.rmx_mtu = IPV6_MMTU; + rt->rt_rmx.rmx_mtu = rt->rt_ifp->if_mtu; } static int @@ -806,7 +806,7 @@ stf_ioctl(ifp, cmd, data) struct ifreq *ifr; struct sockaddr_in6 *sin6; struct in_addr addr; - int error; + int error, mtu; error = 0; switch (cmd) { @@ -840,6 +840,18 @@ stf_ioctl(ifp, cmd, data) error = EAFNOSUPPORT; break; + case SIOCGIFMTU: + break; + + case SIOCSIFMTU: + ifr = (struct ifreq *)data; + mtu = ifr->ifr_mtu; + /* RFC 4213 3.2 ideal world MTU */ + if (mtu < IPV6_MINMTU || mtu > IF_MAXMTU - 20) + return (EINVAL); + ifp->if_mtu = mtu; + break; + default: error = EINVAL; break;
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