In file sys/net/bpf.c CVS revision 1.95 introduce a error. It is wrong if a program use not default setting flag BIOCGSEESENT. Locally generated packet may be copy in user space if flag BIOCGSEESENT set to one.
http://vys.renet.ru/patchs/freebsd-5.1-bpf-1.2.patch
This patch required to allow more effective usage of BPF filter. It
marks every packet as "Incoming" or "Outgoing", in dependence of its direction (for given interface). Then, software which uses BPF filter can skip additional checking. After applying the patch, BPF filter interface still compatible with old software, but BPF_MINOR_VERSION has been changed. The structures bpf_hdr and related C code have been changed:
- added field 'bh_flags' in 'bpf_hdr' structure with the following values:
* BPF_DIRECT_INCOMING (0x4000)
* BPF_DIRECT_OUTGOING (0x8000)
this numbers (0x4000,0x8000) select for future export
flags M_BCAST and M_MCAST in user space.
- removed SIZEOF_BPF_HDR as not necessary.
-- SY. Vladimir Yu. Stepanov
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