projects / unix-history / blame
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1 | /*- |
| 2 | * Copyright (c) 1991 The Regents of the University of California. | |
| 06f08e67 SM |
3 | * All rights reserved. |
| 4 | * | |
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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 of Lawrence Berkeley Laboratory. | |
| 06f08e67 | 8 | * |
| 6cfe221b | 9 | * %sccs.include.redist.c% |
| 06f08e67 | 10 | * |
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11 | * @(#)bpfdesc.h 7.1 (Berkeley) %G% |
| 12 | * | |
| 13 | * @(#) $Header: bpfdesc.h,v 1.7 90/12/04 01:05:01 mccanne Exp $ (LBL) | |
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14 | */ |
| 15 | ||
| 16 | /* | |
| 17 | * Descriptor associated with each open bpf file. | |
| 18 | */ | |
| 19 | struct bpf_d { | |
| 20 | struct bpf_d *bd_next; /* Linked list of descriptors */ | |
| 21 | /* | |
| 22 | * Buffer slots: two mbuf clusters buffer the incoming packets. | |
| 23 | * The model has three slots. Sbuf is always occupied. | |
| 24 | * sbuf (store) - Receive interrupt puts packets here. | |
| 25 | * hbuf (hold) - When sbuf is full, put cluster here and | |
| 26 | * wakeup read (replace sbuf with fbuf). | |
| 27 | * fbuf (free) - When read is done, put cluster here. | |
| 28 | * On receiving, if sbuf is full and fbuf is 0, packet is dropped. | |
| 29 | */ | |
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30 | caddr_t bd_sbuf; /* store slot */ |
| 31 | caddr_t bd_hbuf; /* hold slot */ | |
| 32 | caddr_t bd_fbuf; /* free slot */ | |
| 33 | int bd_slen; /* current length of store buffer */ | |
| 34 | int bd_hlen; /* current length of hold buffer */ | |
| 35 | ||
| 36 | int bd_bufsize; /* absolute length of buffers */ | |
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37 | |
| 38 | struct bpf_if * bd_bif; /* interface descriptor */ | |
| 39 | u_long bd_rtout; /* Read timeout in 'ticks' */ | |
| f8e186b1 | 40 | struct bpf_insn *bd_filter; /* filter code */ |
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41 | u_long bd_rcount; /* number of packets received */ |
| 42 | u_long bd_dcount; /* number of packets dropped */ | |
| f8e186b1 | 43 | struct proc * bd_selproc; /* process that last selected us */ |
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44 | |
| 45 | u_char bd_promisc; /* true if listening promiscuously */ | |
| 46 | u_char bd_state; /* idle, waiting, or timed out */ | |
| f8e186b1 | 47 | u_char bd_selcoll; /* true if selects collide */ |
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48 | u_char bd_immediate; /* true to return on packet arrival */ |
| 49 | }; | |
| 50 | ||
| 51 | /* | |
| 52 | * Descriptor associated with each attached hardware interface. | |
| 53 | */ | |
| 54 | struct bpf_if { | |
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55 | struct bpf_if *bif_next; /* list of all interfaces */ |
| 56 | struct bpf_d *bif_dlist; /* descriptor list */ | |
| 57 | struct bpf_if **bif_driverp; /* pointer into softc */ | |
| 58 | u_int bif_dlt; /* link layer type */ | |
| 59 | u_int bif_hdrlen; /* length of header (with padding) */ | |
| 60 | struct ifnet *bif_ifp; /* correspoding interface */ | |
| 06f08e67 | 61 | }; |