Date: Mon, 2 Jul 2012 02:54:23 +0000 (UTC) From: Xin LI <delphij@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-8@freebsd.org Subject: svn commit: r237946 - stable/8/sys/netinet6 Message-ID: <201207020254.q622sN1a038970@svn.freebsd.org>
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Author: delphij Date: Mon Jul 2 02:54:22 2012 New Revision: 237946 URL: http://svn.freebsd.org/changeset/base/237946 Log: MFC r237571: Fix a LOR acquiring the if_afdata lock while holding an rtentry lock. Possibly do some entra work in case we would not get into the ifa0 != NULL paths later as we already do for the mltaddr before. XXX We should possibly error in case in6_setscope fails. Reference: http://lists.freebsd.org/pipermail/freebsd-net/2011-September/029829.html Submitted by: bz Modified: stable/8/sys/netinet6/in6.c Directory Properties: stable/8/sys/ (props changed) Modified: stable/8/sys/netinet6/in6.c ============================================================================== --- stable/8/sys/netinet6/in6.c Mon Jul 2 02:50:10 2012 (r237945) +++ stable/8/sys/netinet6/in6.c Mon Jul 2 02:54:22 2012 (r237946) @@ -1198,6 +1198,7 @@ in6_purgeaddr_mc(struct ifnet *ifp, stru struct sockaddr_in6 mltaddr, mltmask; struct in6_multi_mship *imm; struct rtentry *rt; + struct sockaddr_in6 sin6; int error; /* @@ -1224,6 +1225,19 @@ in6_purgeaddr_mc(struct ifnet *ifp, stru if ((error = in6_setscope(&mltaddr.sin6_addr, ifp, NULL)) != 0) return (error); + /* + * As for the mltaddr above, proactively prepare the sin6 to avoid + * rtentry un- and re-locking. + */ + if (ifa0 != NULL) { + bzero(&sin6, sizeof(sin6)); + sin6.sin6_len = sizeof(sin6); + sin6.sin6_family = AF_INET6; + memcpy(&sin6.sin6_addr, &satosin6(ifa0->ifa_addr)->sin6_addr, + sizeof(sin6.sin6_addr)); + in6_setscope(&sin6.sin6_addr, ifa0->ifa_ifp, NULL); + } + rt = in6_rtalloc1((struct sockaddr *)&mltaddr, 0, 0UL, RT_DEFAULT_FIB); if (rt != NULL && rt->rt_gateway != NULL && (memcmp(&satosin6(rt->rt_gateway)->sin6_addr, @@ -1250,15 +1264,7 @@ in6_purgeaddr_mc(struct ifnet *ifp, stru /* * Replace the gateway of the route. */ - struct sockaddr_in6 sa; - - bzero(&sa, sizeof(sa)); - sa.sin6_len = sizeof(struct sockaddr_in6); - sa.sin6_family = AF_INET6; - memcpy(&sa.sin6_addr, &satosin6(ifa0->ifa_addr)->sin6_addr, - sizeof(sa.sin6_addr)); - in6_setscope(&sa.sin6_addr, ifa0->ifa_ifp, NULL); - memcpy(rt->rt_gateway, &sa, sizeof(sa)); + memcpy(rt->rt_gateway, &sin6, sizeof(sin6)); RTFREE_LOCKED(rt); } } else { @@ -1300,15 +1306,7 @@ in6_purgeaddr_mc(struct ifnet *ifp, stru /* * Replace the gateway of the route. */ - struct sockaddr_in6 sa; - - bzero(&sa, sizeof(sa)); - sa.sin6_len = sizeof(struct sockaddr_in6); - sa.sin6_family = AF_INET6; - memcpy(&sa.sin6_addr, &satosin6(ifa0->ifa_addr)->sin6_addr, - sizeof(sa.sin6_addr)); - in6_setscope(&sa.sin6_addr, ifa0->ifa_ifp, NULL); - memcpy(rt->rt_gateway, &sa, sizeof(sa)); + memcpy(rt->rt_gateway, &sin6, sizeof(sin6)); RTFREE_LOCKED(rt); } } else {
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