New sentence -> new line and some mdoc cleanup.
MFC after: 3 days
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2020-12-20 02:59:44 +00:00
svn path=/head/; revision=257287
@ -697,9 +697,11 @@ is used when the time stamp is set to
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.Dv BPF_T_MICROTIME_MONOTONIC_FAST ,
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.Dv BPF_T_MICROTIME_MONOTONIC_FAST ,
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or
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or
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.Dv BPF_T_NONE
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.Dv BPF_T_NONE
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for backward compatibility reasons. Otherwise,
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for backward compatibility reasons.
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Otherwise,
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.Vt bpf_xhdr
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.Vt bpf_xhdr
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is used. However,
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is used.
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However,
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.Vt bpf_hdr
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.Vt bpf_hdr
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may be deprecated in the near future.
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may be deprecated in the near future.
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Suitable precautions
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Suitable precautions
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@ -962,19 +964,23 @@ subsystem
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.It Va net.bpf.optimize_writers: No 0
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.It Va net.bpf.optimize_writers: No 0
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Various programs use BPF to send (but not receive) raw packets
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Various programs use BPF to send (but not receive) raw packets
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(cdpd, lldpd, dhcpd, dhcp relays, etc. are good examples of such programs).
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(cdpd, lldpd, dhcpd, dhcp relays, etc. are good examples of such programs).
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They do not need incoming packets to be send to them. Turning this option on
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They do not need incoming packets to be send to them.
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Turning this option on
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makes new BPF users to be attached to write-only interface list until program
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makes new BPF users to be attached to write-only interface list until program
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explicitly specifies read filter via
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explicitly specifies read filter via
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.Cm pcap_set_filter() .
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.Fn pcap_set_filter .
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This removes any performance degradation for high-speed interfaces.
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This removes any performance degradation for high-speed interfaces.
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.It Va net.bpf.stats:
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.It Va net.bpf.stats:
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Binary interface for retrieving general statistics.
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Binary interface for retrieving general statistics.
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.It Va net.bpf.zerocopy_enable: No 0
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.It Va net.bpf.zerocopy_enable: No 0
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Permits zero-copy to be used with net BPF readers. Use with caution.
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Permits zero-copy to be used with net BPF readers.
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Use with caution.
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.It Va net.bpf.maxinsns: No 512
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.It Va net.bpf.maxinsns: No 512
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Maximum number of instructions that BPF program can contain. Use
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Maximum number of instructions that BPF program can contain.
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Use
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.Xr tcpdump 1
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.Xr tcpdump 1
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-d option to determine approximate number of instruction for any filter.
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.Fl d
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option to determine approximate number of instruction for any filter.
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.It Va net.bpf.maxbufsize: No 524288
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.It Va net.bpf.maxbufsize: No 524288
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Maximum buffer size to allocate for packets buffer.
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Maximum buffer size to allocate for packets buffer.
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.It Va net.bpf.bufsize: No 4096
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.It Va net.bpf.bufsize: No 4096
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