svn commit: r360069 - head/sys/net
Kristof Provost
kp at FreeBSD.org
Sat Apr 18 08:00:59 UTC 2020
Author: kp
Date: Sat Apr 18 08:00:58 2020
New Revision: 360069
URL: https://svnweb.freebsd.org/changeset/base/360069
Log:
bridge: Simplify mac address generation
Unconditionally use ether_gen_addr() to generate bridge mac addresses. This
function is now less likely to generate duplicate mac addresses across jails.
The old hand rolled hostid based code adds no value.
Reviewed by: bz
Differential Revision: https://reviews.freebsd.org/D24432
Modified:
head/sys/net/if_bridge.c
Modified: head/sys/net/if_bridge.c
==============================================================================
--- head/sys/net/if_bridge.c Sat Apr 18 07:50:30 2020 (r360068)
+++ head/sys/net/if_bridge.c Sat Apr 18 08:00:58 2020 (r360069)
@@ -676,10 +676,8 @@ SYSCTL_PROC(_net_link_bridge, OID_AUTO, ipfw,
static int
bridge_clone_create(struct if_clone *ifc, int unit, caddr_t params)
{
- struct bridge_softc *sc, *sc2;
- struct ifnet *bifp, *ifp;
- int fb, retry;
- unsigned long hostid;
+ struct bridge_softc *sc;
+ struct ifnet *ifp;
sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO);
ifp = sc->sc_ifp = if_alloc(IFT_ETHER);
@@ -709,41 +707,7 @@ bridge_clone_create(struct if_clone *ifc, int unit, ca
ifp->if_init = bridge_init;
ifp->if_type = IFT_BRIDGE;
- /*
- * 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);
- do {
- if (fb || hostid == 0) {
- ether_gen_addr(ifp, &sc->sc_defaddr);
- } else {
- sc->sc_defaddr.octet[0] = 0x2;
- sc->sc_defaddr.octet[1] = (hostid >> 24) & 0xff;
- sc->sc_defaddr.octet[2] = (hostid >> 16) & 0xff;
- sc->sc_defaddr.octet[3] = (hostid >> 8 ) & 0xff;
- sc->sc_defaddr.octet[4] = hostid & 0xff;
- sc->sc_defaddr.octet[5] = ifp->if_dunit & 0xff;
- }
-
- fb = 1;
- retry = 0;
- BRIDGE_LIST_LOCK();
- LIST_FOREACH(sc2, &V_bridge_list, sc_list) {
- bifp = sc2->sc_ifp;
- if (memcmp(sc->sc_defaddr.octet,
- IF_LLADDR(bifp), ETHER_ADDR_LEN) == 0) {
- retry = 1;
- break;
- }
- }
- BRIDGE_LIST_UNLOCK();
- } while (retry == 1);
+ ether_gen_addr(ifp, &sc->sc_defaddr);
bstp_attach(&sc->sc_stp, &bridge_ops);
ether_ifattach(ifp, sc->sc_defaddr.octet);
More information about the svn-src-all
mailing list