Date: Mon, 3 Oct 2011 19:51:19 +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: r225947 - head/sys/netinet Message-ID: <201110031951.p93JpJLA025249@svn.freebsd.org>
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Author: qingli Date: Mon Oct 3 19:51:18 2011 New Revision: 225947 URL: http://svn.freebsd.org/changeset/base/225947 Log: A system may have multiple physical interfaces, all of which are on the same prefix. Since a single route entry is installed for the prefix (without RADIX_MPATH), incoming packets on the interfaces that are not associated with the prefix route may trigger an error message about unable to allocation LLE entry, and fails L2. This patch makes sure a valid route is present in the system, and allow the aforementioned condition to exist and treats as valid. Reviewed by: bz MFC after: 5 days Modified: head/sys/netinet/in.c Modified: head/sys/netinet/in.c ============================================================================== --- head/sys/netinet/in.c Mon Oct 3 19:06:55 2011 (r225946) +++ head/sys/netinet/in.c Mon Oct 3 19:51:18 2011 (r225947) @@ -1439,14 +1439,43 @@ in_lltable_rtcheck(struct ifnet *ifp, u_ if (memcmp(rt->rt_gateway->sa_data, l3addr->sa_data, sizeof(in_addr_t)) != 0) error = EINVAL; - } else if (!(flags & LLE_PUB) && ((rt->rt_flags & RTF_GATEWAY) || - (rt->rt_ifp != ifp))) { + } + + if (rt->rt_flags & RTF_GATEWAY) { + RTFREE_LOCKED(rt); + return (EINVAL); + } + + /* + * Make sure that at least the destination address is covered + * by the route. This is for handling the case where 2 or more + * interfaces have the same prefix. An incoming packet arrives + * on one interface and the corresponding outgoing packet leaves + * another interface. + * + */ + if (rt->rt_ifp != ifp) { + char *sa, *mask, *addr, *lim; + int len; + + sa = (char *)rt_key(rt); + mask = (char *)rt_mask(rt); + addr = (char *)__DECONST(struct sockaddr *, l3addr); + len = ((struct sockaddr_in *)__DECONST(struct sockaddr *, l3addr))->sin_len; + lim = addr + len; + + for ( ; addr < lim; sa++, mask++, addr++) { + if ((*sa ^ *addr) & *mask) { + error = EINVAL; #ifdef DIAGNOSTIC - log(LOG_INFO, "IPv4 address: \"%s\" is not on the network\n", - inet_ntoa(((const struct sockaddr_in *)l3addr)->sin_addr)); + log(LOG_INFO, "IPv4 address: \"%s\" is not on the network\n", + inet_ntoa(((const struct sockaddr_in *)l3addr)->sin_addr)); #endif - error = EINVAL; + break; + } + } } + RTFREE_LOCKED(rt); return (error); }
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