From owner-svn-src-head@freebsd.org Tue Jan 23 07:15:17 2018 Return-Path: Delivered-To: svn-src-head@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 1EDC3EB6581; Tue, 23 Jan 2018 07:15:17 +0000 (UTC) (envelope-from rstone@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "mxrelay.nyi.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id D7CBD3C31; Tue, 23 Jan 2018 07:15:16 +0000 (UTC) (envelope-from rstone@FreeBSD.org) Received: from repo.freebsd.org (repo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 925962372F; Tue, 23 Jan 2018 03:15:44 +0000 (UTC) (envelope-from rstone@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id w0N3Fiv7007010; Tue, 23 Jan 2018 03:15:44 GMT (envelope-from rstone@FreeBSD.org) Received: (from rstone@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id w0N3FiAr007009; Tue, 23 Jan 2018 03:15:44 GMT (envelope-from rstone@FreeBSD.org) Message-Id: <201801230315.w0N3FiAr007009@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: rstone set sender to rstone@FreeBSD.org using -f From: Ryan Stone Date: Tue, 23 Jan 2018 03:15:44 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r328272 - head/sys/net X-SVN-Group: head X-SVN-Commit-Author: rstone X-SVN-Commit-Paths: head/sys/net X-SVN-Commit-Revision: 328272 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-head@freebsd.org X-Mailman-Version: 2.1.25 Precedence: list List-Id: SVN commit messages for the src tree for head/-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 23 Jan 2018 07:15:17 -0000 Author: rstone Date: Tue Jan 23 03:15:44 2018 New Revision: 328272 URL: https://svnweb.freebsd.org/changeset/base/328272 Log: Increment the route table gen count after a modify Increment the route table generation count after modifying a route. This signals back to TCP connections that they need to update their L2 caches as the gateway for their route may have changed. This is a heavier hammer than is needed, strictly speaking, but route changes will be unlikely enough that the performance effects of invalidating all connection route caches should be negligible. MFC after: 1 week Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D13990 Reviewed by: karels Modified: head/sys/net/route.c Modified: head/sys/net/route.c ============================================================================== --- head/sys/net/route.c Tue Jan 23 03:15:39 2018 (r328271) +++ head/sys/net/route.c Tue Jan 23 03:15:44 2018 (r328272) @@ -1733,6 +1733,8 @@ rtrequest1_fib_change(struct rib_head *rnh, struct rt_ int family, mtu; struct if_mtuinfo ifmtu; + RIB_WLOCK_ASSERT(rnh); + rt = (struct rtentry *)rnh->rnh_lookup(info->rti_info[RTAX_DST], info->rti_info[RTAX_NETMASK], &rnh->head); @@ -1822,6 +1824,13 @@ rtrequest1_fib_change(struct rib_head *rnh, struct rt_ if_updatemtu_cb(rt->rt_nodes, &ifmtu); } } + + /* + * This route change may have modified the route's gateway. In that + * case, any inpcbs that have cached this route need to invalidate their + * llentry cache. + */ + rnh->rnh_gen++; if (ret_nrt) { *ret_nrt = rt;