From owner-svn-src-all@FreeBSD.ORG Sun Sep 4 22:06:32 2011 Return-Path: Delivered-To: svn-src-all@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id C4D331065672; Sun, 4 Sep 2011 22:06:32 +0000 (UTC) (envelope-from thompsa@FreeBSD.org) Received: from svn.freebsd.org (svn.freebsd.org [IPv6:2001:4f8:fff6::2c]) by mx1.freebsd.org (Postfix) with ESMTP id 9AC418FC08; Sun, 4 Sep 2011 22:06:32 +0000 (UTC) Received: from svn.freebsd.org (localhost [127.0.0.1]) by svn.freebsd.org (8.14.4/8.14.4) with ESMTP id p84M6WHE008869; Sun, 4 Sep 2011 22:06:32 GMT (envelope-from thompsa@svn.freebsd.org) Received: (from thompsa@localhost) by svn.freebsd.org (8.14.4/8.14.4/Submit) id p84M6W8e008867; Sun, 4 Sep 2011 22:06:32 GMT (envelope-from thompsa@svn.freebsd.org) Message-Id: <201109042206.p84M6W8e008867@svn.freebsd.org> From: Andrew Thompson Date: Sun, 4 Sep 2011 22:06:32 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org X-SVN-Group: head MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Cc: Subject: svn commit: r225380 - head/sys/net X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: "SVN commit messages for the entire src tree \(except for " user" and " projects" \)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 04 Sep 2011 22:06:32 -0000 Author: thompsa Date: Sun Sep 4 22:06:32 2011 New Revision: 225380 URL: http://svn.freebsd.org/changeset/base/225380 Log: On the first loop for generating a bridge MAC address use the local hostid, this gives a good chance of keeping the same address over reboots. This is intended to help IPV6 and similar which generate their addresses from the mac. PR: kern/160300 Submitted by: mdodd Approved by: re (kib) Modified: head/sys/net/if_bridge.c Modified: head/sys/net/if_bridge.c ============================================================================== --- head/sys/net/if_bridge.c Sun Sep 4 16:26:43 2011 (r225379) +++ head/sys/net/if_bridge.c Sun Sep 4 22:06:32 2011 (r225380) @@ -85,6 +85,7 @@ __FBSDID("$FreeBSD$"); #include #include #include +#include #include #include /* for net/if.h */ #include @@ -560,7 +561,8 @@ bridge_clone_create(struct if_clone *ifc { struct bridge_softc *sc, *sc2; struct ifnet *bifp, *ifp; - int retry; + int fb, retry; + unsigned long hostid; sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO); ifp = sc->sc_ifp = if_alloc(IFT_ETHER); @@ -593,17 +595,30 @@ bridge_clone_create(struct if_clone *ifc IFQ_SET_READY(&ifp->if_snd); /* - * Generate a random ethernet address with a locally administered - * address. + * Generate an ethernet address with a locally administered address. * * Since we are using random ethernet addresses for the bridge, it is * possible that we might have address collisions, so make sure that * this hardware address isn't already in use on another bridge. + * The first try uses the hostid and falls back to arc4rand(). */ + fb = 0; + getcredhostid(curthread->td_ucred, &hostid); for (retry = 1; retry != 0;) { - arc4rand(sc->sc_defaddr, ETHER_ADDR_LEN, 1); - sc->sc_defaddr[0] &= ~1; /* clear multicast bit */ - sc->sc_defaddr[0] |= 2; /* set the LAA bit */ + if (fb || hostid == 0) { + arc4rand(sc->sc_defaddr, ETHER_ADDR_LEN, 1); + sc->sc_defaddr[0] &= ~1;/* clear multicast bit */ + sc->sc_defaddr[0] |= 2; /* set the LAA bit */ + } else { + sc->sc_defaddr[0] = 0x2; + sc->sc_defaddr[1] = (hostid >> 24) & 0xff; + sc->sc_defaddr[2] = (hostid >> 16) & 0xff; + sc->sc_defaddr[3] = (hostid >> 8 ) & 0xff; + sc->sc_defaddr[4] = hostid & 0xff; + sc->sc_defaddr[5] = ifp->if_dunit & 0xff; + } + + fb = 1; retry = 0; mtx_lock(&bridge_list_mtx); LIST_FOREACH(sc2, &bridge_list, sc_list) {