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| /freebsd-11-stable/sys/net/ | ||
| H A D | if_tap.c | diff 166443 Sat Feb 03 00:57:45 MST 2007 bms Drop unicast Ethernet frames not destined for the configured address of a tap(4) instance, if IFF_PROMISC is not set. In tap(4), we should emulate the effect IFF_PROMISC would have on hardware, otherwise we risk introducing layer 2 loops if tap(4) is used with bridges. This means not even bpf(4) gets to see them. This patch has been tested in a variety of situations. Multicast and broadcast frames are correctly allowed through. I have observed this behaviour causing problems with multiple QEMU instances hosted on the same FreeBSD machine. The checks in in ether_demux() [if_ethersubr.c, rev 1.222, line 638] are insufficient to prevent this bug from occurring, as ifp->if_vlantrunk will always be NULL for the non-vlan case. MFC after: 3 weeks PR: 86429 Submitted by: Pieter de Boer (with changes) |
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