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New sentence -> new line and some mdoc cleanup.

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MFC after:	3 days
This commit is contained in:
Christian Brueffer 2013-10-28 22:54:28 +00:00
parent 104dc21415
commit b4e16cf882
1 changed files with 13 additions and 7 deletions
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20
share/man/man4/bpf.4
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@ -697,9 +697,11 @@ is used when the time stamp is set to
.Dv BPF_T_MICROTIME_MONOTONIC_FAST , .Dv BPF_T_MICROTIME_MONOTONIC_FAST ,
or or
.Dv BPF_T_NONE .Dv BPF_T_NONE
for backward compatibility reasons. Otherwise, for backward compatibility reasons.
Otherwise,
.Vt bpf_xhdr .Vt bpf_xhdr
is used. However, is used.
However,
.Vt bpf_hdr .Vt bpf_hdr
may be deprecated in the near future. may be deprecated in the near future.
Suitable precautions Suitable precautions
@ -962,19 +964,23 @@ subsystem
.It Va net.bpf.optimize_writers: No 0 .It Va net.bpf.optimize_writers: No 0
Various programs use BPF to send (but not receive) raw packets Various programs use BPF to send (but not receive) raw packets
(cdpd, lldpd, dhcpd, dhcp relays, etc. are good examples of such programs). (cdpd, lldpd, dhcpd, dhcp relays, etc. are good examples of such programs).
They do not need incoming packets to be send to them. Turning this option on They do not need incoming packets to be send to them.
Turning this option on
makes new BPF users to be attached to write-only interface list until program makes new BPF users to be attached to write-only interface list until program
explicitly specifies read filter via explicitly specifies read filter via
.Cm pcap_set_filter() . .Fn pcap_set_filter .
This removes any performance degradation for high-speed interfaces. This removes any performance degradation for high-speed interfaces.
.It Va net.bpf.stats: .It Va net.bpf.stats:
Binary interface for retrieving general statistics. Binary interface for retrieving general statistics.
.It Va net.bpf.zerocopy_enable: No 0 .It Va net.bpf.zerocopy_enable: No 0
Permits zero-copy to be used with net BPF readers. Use with caution. Permits zero-copy to be used with net BPF readers.
Use with caution.
.It Va net.bpf.maxinsns: No 512 .It Va net.bpf.maxinsns: No 512
Maximum number of instructions that BPF program can contain. Use Maximum number of instructions that BPF program can contain.
Use
.Xr tcpdump 1 .Xr tcpdump 1
-d option to determine approximate number of instruction for any filter. .Fl d
option to determine approximate number of instruction for any filter.
.It Va net.bpf.maxbufsize: No 524288 .It Va net.bpf.maxbufsize: No 524288
Maximum buffer size to allocate for packets buffer. Maximum buffer size to allocate for packets buffer.
.It Va net.bpf.bufsize: No 4096 .It Va net.bpf.bufsize: No 4096