Date: Tue, 28 Jul 2009 17:16:55 +0000 (UTC) From: Qing Li <qingli@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r195921 - head/sys/net Message-ID: <200907281716.n6SHGtGC038664@svn.freebsd.org>
next in thread | raw e-mail | index | archive | help
Author: qingli Date: Tue Jul 28 17:16:54 2009 New Revision: 195921 URL: http://svn.freebsd.org/changeset/base/195921 Log: The new flow table caches both the routing table entry as well as the L2 information. For an indirect route the cached L2 entry contains the MAC address of the gateway. Typically the default route is used to transmit multicast packets when explicit multicast routes are not available. The ether_output() function bypasses L2 resolution function if it verifies the L2 cache is valid, because the cached L2 address (a unicast MAC address) is copied into the packets as the destination MAC address. This validation, however, does not apply to broadcast and multicast packets because the destination MAC address is mapped according to a standard method instead. Submitted by: Xin Li Reviewed by: bz Approved by: re Modified: head/sys/net/if_ethersubr.c Modified: head/sys/net/if_ethersubr.c ============================================================================== --- head/sys/net/if_ethersubr.c Tue Jul 28 15:57:53 2009 (r195920) +++ head/sys/net/if_ethersubr.c Tue Jul 28 17:16:54 2009 (r195921) @@ -174,7 +174,8 @@ ether_output(struct ifnet *ifp, struct m int hlen; /* link layer header length */ if (ro != NULL) { - lle = ro->ro_lle; + if (!(m->m_flags & (M_BCAST | M_MCAST))) + lle = ro->ro_lle; rt0 = ro->ro_rt; } #ifdef MAC
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200907281716.n6SHGtGC038664>