diff options
| author | Paul de Weerd <weerd@cvs.openbsd.org> | 2010-11-04 23:07:16 +0000 |
|---|---|---|
| committer | Paul de Weerd <weerd@cvs.openbsd.org> | 2010-11-04 23:07:16 +0000 |
| commit | 276c0fdc008c9390231e1a6fb7bfba5c4322efe4 (patch) | |
| tree | d627a4cebb6b7ce29134f0e0a7d8ebfa2b3de8cc /sys | |
| parent | 2ddf68e9fdece68c6dd3b4aff4fcaedf6906b38b (diff) | |
Filter out reserved destination MAC addresses (01:80:C2:00:00:0x) as
per the 802.1D-2004 spec. With lots of help and guidance (and some
nagging) from claudio. Tested with net/ladvd port on i386 and amd64.
'be a man' claudio@, ok mpf@
Diffstat (limited to 'sys')
| -rw-r--r-- | sys/net/if_bridge.c | 23 |
1 files changed, 18 insertions, 5 deletions
diff --git a/sys/net/if_bridge.c b/sys/net/if_bridge.c index 936980e3a2d..b8b0b652e70 100644 --- a/sys/net/if_bridge.c +++ b/sys/net/if_bridge.c @@ -1,4 +1,4 @@ -/* $OpenBSD: if_bridge.c,v 1.187 2010/10/31 15:14:30 mpf Exp $ */ +/* $OpenBSD: if_bridge.c,v 1.188 2010/11/04 23:07:15 weerd Exp $ */ /* * Copyright (c) 1999, 2000 Jason L. Wright (jason@thought.net) @@ -1415,10 +1415,23 @@ bridge_input(struct ifnet *ifp, struct ether_header *eh, struct mbuf *m) bridge_span(sc, eh, m); if (m->m_flags & (M_BCAST | M_MCAST)) { - /* Tap off 802.1D packets, they do not get forwarded */ - if (bcmp(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN) == 0) { - bstp_input(sc->sc_stp, ifl->bif_stp, eh, m); - return (NULL); + /* + * Reserved destination MAC addresses (01:80:C2:00:00:0x) + * should not be forwarded to bridge members according to + * section 7.12.6 of the 802.1D-2004 specification. The + * STP destination address (as stored in bstp_etheraddr) + * is the first of these. + */ + if (bcmp(eh->ether_dhost, bstp_etheraddr, ETHER_ADDR_LEN - 1) + == 0) { + if (eh->ether_dhost[ETHER_ADDR_LEN - 1] == 0) { + /* STP traffic */ + bstp_input(sc->sc_stp, ifl->bif_stp, eh, m); + return (NULL); + } else if (eh->ether_dhost[ETHER_ADDR_LEN - 1] <= 0xf) { + m_freem(m); + return (NULL); + } } /* |