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81c7b6ec SM |
1 | /* |
2 | * Copyright (c) 1990, 1991 Regents of the University of California. | |
06f08e67 SM |
3 | * All rights reserved. |
4 | * | |
6cfe221b KB |
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 | |
81c7b6ec | 7 | * to Berkeley by Steven McCanne and Van Jacobson both of Lawrence |
c096a108 | 8 | * Berkeley Laboratory. |
06f08e67 | 9 | * |
81c7b6ec | 10 | * %sccs.include.redist.c% |
6cfe221b | 11 | * |
49ed2d4b | 12 | * @(#)bpfdesc.h 7.5 (Berkeley) %G% |
c096a108 SM |
13 | * |
14 | * @(#) $Header: bpfdesc.h,v 1.9 91/10/27 21:22:38 mccanne Exp $ (LBL) | |
06f08e67 SM |
15 | */ |
16 | ||
17 | /* | |
18 | * Descriptor associated with each open bpf file. | |
19 | */ | |
20 | struct bpf_d { | |
21 | struct bpf_d *bd_next; /* Linked list of descriptors */ | |
22 | /* | |
23 | * Buffer slots: two mbuf clusters buffer the incoming packets. | |
24 | * The model has three slots. Sbuf is always occupied. | |
25 | * sbuf (store) - Receive interrupt puts packets here. | |
26 | * hbuf (hold) - When sbuf is full, put cluster here and | |
27 | * wakeup read (replace sbuf with fbuf). | |
28 | * fbuf (free) - When read is done, put cluster here. | |
29 | * On receiving, if sbuf is full and fbuf is 0, packet is dropped. | |
30 | */ | |
f8e186b1 SM |
31 | caddr_t bd_sbuf; /* store slot */ |
32 | caddr_t bd_hbuf; /* hold slot */ | |
33 | caddr_t bd_fbuf; /* free slot */ | |
34 | int bd_slen; /* current length of store buffer */ | |
35 | int bd_hlen; /* current length of hold buffer */ | |
36 | ||
37 | int bd_bufsize; /* absolute length of buffers */ | |
06f08e67 SM |
38 | |
39 | struct bpf_if * bd_bif; /* interface descriptor */ | |
40 | u_long bd_rtout; /* Read timeout in 'ticks' */ | |
f8e186b1 | 41 | struct bpf_insn *bd_filter; /* filter code */ |
06f08e67 SM |
42 | u_long bd_rcount; /* number of packets received */ |
43 | u_long bd_dcount; /* number of packets dropped */ | |
06f08e67 SM |
44 | |
45 | u_char bd_promisc; /* true if listening promiscuously */ | |
46 | u_char bd_state; /* idle, waiting, or timed out */ | |
06f08e67 | 47 | u_char bd_immediate; /* true to return on packet arrival */ |
c096a108 | 48 | #if BSD < 199103 |
49ed2d4b | 49 | u_char bd_selcoll; /* true if selects collide */ |
c096a108 | 50 | int bd_timedout; |
49ed2d4b SM |
51 | struct proc * bd_selproc; /* process that last selected us */ |
52 | #else | |
53 | u_char bd_pad; /* explicit alignment */ | |
54 | struct selinfo bd_sel; /* bsd select info */ | |
c096a108 | 55 | #endif |
06f08e67 SM |
56 | }; |
57 | ||
58 | /* | |
59 | * Descriptor associated with each attached hardware interface. | |
60 | */ | |
61 | struct bpf_if { | |
7249f2db SM |
62 | struct bpf_if *bif_next; /* list of all interfaces */ |
63 | struct bpf_d *bif_dlist; /* descriptor list */ | |
64 | struct bpf_if **bif_driverp; /* pointer into softc */ | |
65 | u_int bif_dlt; /* link layer type */ | |
66 | u_int bif_hdrlen; /* length of header (with padding) */ | |
67 | struct ifnet *bif_ifp; /* correspoding interface */ | |
06f08e67 | 68 | }; |