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15637ed4 RG |
1 | /*- |
2 | * Copyright (c) 1991 The Regents of the University of California. | |
3 | * All rights reserved. | |
4 | * | |
5 | * This code is derived from the Stanford/CMU enet packet filter, | |
6 | * (net/enet.c) distributed as part of 4.3BSD, and code contributed | |
7 | * to Berkeley by Steven McCanne and Van Jacobson both of Lawrence | |
8 | * Berkeley Laboratory. | |
9 | * | |
10 | * Redistribution and use in source and binary forms, with or without | |
11 | * modification, are permitted provided that the following conditions | |
12 | * are met: | |
13 | * 1. Redistributions of source code must retain the above copyright | |
14 | * notice, this list of conditions and the following disclaimer. | |
15 | * 2. Redistributions in binary form must reproduce the above copyright | |
16 | * notice, this list of conditions and the following disclaimer in the | |
17 | * documentation and/or other materials provided with the distribution. | |
18 | * 3. All advertising materials mentioning features or use of this software | |
19 | * must display the following acknowledgement: | |
20 | * This product includes software developed by the University of | |
21 | * California, Berkeley and its contributors. | |
22 | * 4. Neither the name of the University nor the names of its contributors | |
23 | * may be used to endorse or promote products derived from this software | |
24 | * without specific prior written permission. | |
25 | * | |
26 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
27 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
28 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
29 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
30 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
31 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
32 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
33 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
34 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
35 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
36 | * SUCH DAMAGE. | |
37 | * | |
78ed81a3 | 38 | * from: @(#)bpfdesc.h 7.1 (Berkeley) 5/7/91 |
39 | * $Id$ | |
15637ed4 RG |
40 | */ |
41 | ||
42 | /* | |
43 | * Descriptor associated with each open bpf file. | |
44 | */ | |
45 | struct bpf_d { | |
46 | struct bpf_d *bd_next; /* Linked list of descriptors */ | |
47 | /* | |
48 | * Buffer slots: two mbuf clusters buffer the incoming packets. | |
49 | * The model has three slots. Sbuf is always occupied. | |
50 | * sbuf (store) - Receive interrupt puts packets here. | |
51 | * hbuf (hold) - When sbuf is full, put cluster here and | |
52 | * wakeup read (replace sbuf with fbuf). | |
53 | * fbuf (free) - When read is done, put cluster here. | |
54 | * On receiving, if sbuf is full and fbuf is 0, packet is dropped. | |
55 | */ | |
56 | caddr_t bd_sbuf; /* store slot */ | |
57 | caddr_t bd_hbuf; /* hold slot */ | |
58 | caddr_t bd_fbuf; /* free slot */ | |
59 | int bd_slen; /* current length of store buffer */ | |
60 | int bd_hlen; /* current length of hold buffer */ | |
61 | ||
62 | int bd_bufsize; /* absolute length of buffers */ | |
63 | ||
64 | struct bpf_if * bd_bif; /* interface descriptor */ | |
65 | u_long bd_rtout; /* Read timeout in 'ticks' */ | |
66 | struct bpf_insn *bd_filter; /* filter code */ | |
67 | u_long bd_rcount; /* number of packets received */ | |
68 | u_long bd_dcount; /* number of packets dropped */ | |
69 | ||
70 | u_char bd_promisc; /* true if listening promiscuously */ | |
71 | u_char bd_state; /* idle, waiting, or timed out */ | |
72 | u_char bd_immediate; /* true to return on packet arrival */ | |
73 | u_char bd_selcoll; /* true if selects collide */ | |
74 | int bd_timedout; | |
75 | struct proc * bd_selproc; /* process that last selected us */ | |
76 | }; | |
77 | ||
78 | /* | |
79 | * Descriptor associated with each attached hardware interface. | |
80 | */ | |
81 | struct bpf_if { | |
82 | struct bpf_if *bif_next; /* list of all interfaces */ | |
83 | struct bpf_d *bif_dlist; /* descriptor list */ | |
84 | struct bpf_if **bif_driverp; /* pointer into softc */ | |
85 | u_int bif_dlt; /* link layer type */ | |
86 | u_int bif_hdrlen; /* length of header (with padding) */ | |
87 | struct ifnet *bif_ifp; /* correspoding interface */ | |
88 | }; |