| bpf.9 (ea0e76a28d1b70b4dbc7d704f3a6e3ec70c22a16) | bpf.9 (6c74ff0ea6eb5eb3a21d05486740c9488721a8b5) |
|---|---|
| 1.\" Copyright (c) 2004 FreeBSD Inc. 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. --- 10 unchanged lines hidden (view full) --- 19.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23.\" SUCH DAMAGE. 24.\" 25.\" $FreeBSD$ 26.\" | 1.\" Copyright (c) 2004 FreeBSD Inc. 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. --- 10 unchanged lines hidden (view full) --- 19.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23.\" SUCH DAMAGE. 24.\" 25.\" $FreeBSD$ 26.\" |
| 27.Dd December 13, 2006 | 27.Dd May 11, 2012 |
| 28.Dt BPF 9 29.Os 30.\" 31.Sh NAME 32.Nm bpf 33.Nd "Berkeley Packet Filter" 34.\" 35.Sh SYNOPSIS --- 205 unchanged lines hidden (view full) --- 241if there is no filter. 242Otherwise, it returns the result of the filter program. 243.Pp 244The 245.Fn bpf_validate 246function 247returns 0 when the program is not a valid filter program. 248.\" | 28.Dt BPF 9 29.Os 30.\" 31.Sh NAME 32.Nm bpf 33.Nd "Berkeley Packet Filter" 34.\" 35.Sh SYNOPSIS --- 205 unchanged lines hidden (view full) --- 241if there is no filter. 242Otherwise, it returns the result of the filter program. 243.Pp 244The 245.Fn bpf_validate 246function 247returns 0 when the program is not a valid filter program. 248.\" |
| 249.Sh EVENT HANDLERS 250.Nm 251invokes 252.Fa bpf_track 253.Xr EVENTHANDLER 9 254event each time listener attaches to or detaches from an interface. 255Pointer to 256.Pq Vt "struct ifnet *" 257is passed as the first argument, interface 258.Fa dlt 259follows. Last argument indicates listener is attached (1) or 260detached (0). 261Note that handler is invoked with 262.Nm 263global lock held, which implies restriction on sleeping and calling 264.Nm 265subsystem inside 266.Xr EVENTHANDLER 9 267dispatcher. 268Note that handler is not called for write-only listeners. 269.\" |
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| 249.Sh SEE ALSO 250.Xr tcpdump 1 , | 270.Sh SEE ALSO 271.Xr tcpdump 1 , |
| 251.Xr bpf 4 | 272.Xr bpf 4 , 273.Xr EVENTHANDLER 9 |
| 252.\" 253.Sh HISTORY 254The Enet packet filter was created in 1980 by Mike Accetta and 255Rick Rashid at Carnegie-Mellon University. 256Jeffrey Mogul, 257at Stanford, 258ported the code to 259.Bx --- 20 unchanged lines hidden --- | 274.\" 275.Sh HISTORY 276The Enet packet filter was created in 1980 by Mike Accetta and 277Rick Rashid at Carnegie-Mellon University. 278Jeffrey Mogul, 279at Stanford, 280ported the code to 281.Bx --- 20 unchanged lines hidden --- |