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drop wrongly looped back multicast packet before we put it into BPF.

This commit is contained in:
itojun 1999-09-12 18:26:58 +00:00
parent eadd0f76da
commit e0042cf412
1 changed files with 18 additions and 17 deletions
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35
sys/dev/ic/smc91cxx.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: smc91cxx.c,v 1.18 1999/09/10 00:23:34 itojun Exp $ */
/* $NetBSD: smc91cxx.c,v 1.19 1999/09/12 18:26:58 itojun Exp $ */
/*-
* Copyright (c) 1997 The NetBSD Foundation, Inc.
@ -923,10 +923,25 @@ smc91cxx_read(sc)
ifp->if_ipackets++;
if ((ifp->if_flags & IFF_PROMISC) != 0) {
/*
* Make sure to behave as IFF_SIMPLEX in all cases.
* Drop multicast/broadcast packet looped back from myself.
*
* This is to cope with SMC91C92 (Megahertz XJ10BT), which
* loops back multicast packet to itself on promiscuous mode.
* (should be ensured by chipset configuration)
*/
if ((eh->ether_dhost[0] & 1) == 1 && /* mcast || bcast */
ether_cmp(eh->ether_shost, LLADDR(ifp->if_sadl)) == 0) {
m_freem(m);
goto out;
}
}
#if NBPFILTER > 0
/*
* Hand the packet off to bpf listeners. If there's a bpf listener,
* we need to check if the packet is ours.
* Hand the packet off to bpf listeners.
*/
if (ifp->if_bpf)
bpf_mtap(ifp->if_bpf, m);
@ -941,20 +956,6 @@ smc91cxx_read(sc)
m_freem(m);
goto out;
}
/*
* Make sure to behave as IFF_SIMPLEX in all cases.
* Drop multicast/broadcast packet looped back from myself.
*
* This is to cope with SMC91C92 (Megahertz XJ10BT), which
* loops back multicast packet to itself on promiscuous mode.
* (should be ensured by chipset configuration)
*/
if ((eh->ether_dhost[0] & 1) == 1 && /* mcast || bcast */
ether_cmp(eh->ether_shost, LLADDR(ifp->if_sadl)) == 0) {
m_freem(m);
goto out;
}
}
m->m_pkthdr.len = m->m_len = packetlen;