Date: Wed, 29 Jul 2015 17:46:17 +0000 (UTC) From: Ermal Luçi <eri@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-10@freebsd.org Subject: svn commit: r286025 - stable/10/sys/netinet Message-ID: <201507291746.t6THkH8v057138@repo.freebsd.org>
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Author: eri Date: Wed Jul 29 17:46:16 2015 New Revision: 286025 URL: https://svnweb.freebsd.org/changeset/base/286025 Log: MFC r285051 Avoid doing multiple route lookups for the same destination IP during forwarding. Differential Revision: https://reviews.freebsd.org/D2964 Modified: stable/10/sys/netinet/ip_input.c Directory Properties: stable/10/ (props changed) Modified: stable/10/sys/netinet/ip_input.c ============================================================================== --- stable/10/sys/netinet/ip_input.c Wed Jul 29 17:34:26 2015 (r286024) +++ stable/10/sys/netinet/ip_input.c Wed Jul 29 17:46:16 2015 (r286025) @@ -1345,6 +1345,7 @@ ip_forward(struct mbuf *m, int srcrt) struct ip *ip = mtod(m, struct ip *); struct in_ifaddr *ia; struct mbuf *mcopy; + struct sockaddr_in *sin; struct in_addr dest; struct route ro; int error, type = 0, code = 0, mtu = 0; @@ -1366,7 +1367,22 @@ ip_forward(struct mbuf *m, int srcrt) } #endif - ia = ip_rtaddr(ip->ip_dst, M_GETFIB(m)); + bzero(&ro, sizeof(ro)); + sin = (struct sockaddr_in *)&ro.ro_dst; + sin->sin_family = AF_INET; + sin->sin_len = sizeof(*sin); + sin->sin_addr = ip->ip_dst; +#ifdef RADIX_MPATH + rtalloc_mpath_fib(&ro, + ntohl(ip->ip_src.s_addr ^ ip->ip_dst.s_addr), + M_GETFIB(m)); +#else + in_rtalloc_ign(&ro, 0, M_GETFIB(m)); +#endif + if (ro.ro_rt != NULL) { + ia = ifatoia(ro.ro_rt->rt_ifa); + ifa_ref(&ia->ia_ifa); + } #ifndef IPSEC /* * 'ia' may be NULL if there is no route for this destination. @@ -1375,6 +1391,7 @@ ip_forward(struct mbuf *m, int srcrt) */ if (!srcrt && ia == NULL) { icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0); + RO_RTFREE(&ro); return; } #endif @@ -1431,16 +1448,8 @@ ip_forward(struct mbuf *m, int srcrt) dest.s_addr = 0; if (!srcrt && V_ipsendredirects && ia != NULL && ia->ia_ifp == m->m_pkthdr.rcvif) { - struct sockaddr_in *sin; struct rtentry *rt; - bzero(&ro, sizeof(ro)); - sin = (struct sockaddr_in *)&ro.ro_dst; - sin->sin_family = AF_INET; - sin->sin_len = sizeof(*sin); - sin->sin_addr = ip->ip_dst; - in_rtalloc_ign(&ro, 0, M_GETFIB(m)); - rt = ro.ro_rt; if (rt && (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 && @@ -1459,16 +1468,8 @@ ip_forward(struct mbuf *m, int srcrt) code = ICMP_REDIRECT_HOST; } } - if (rt) - RTFREE(rt); } - /* - * Try to cache the route MTU from ip_output so we can consider it for - * the ICMP_UNREACH_NEEDFRAG "Next-Hop MTU" field described in RFC1191. - */ - bzero(&ro, sizeof(ro)); - error = ip_output(m, NULL, &ro, IP_FORWARDING, NULL, NULL); if (error == EMSGSIZE && ro.ro_rt)
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