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 * 38 * from: @(#)bpfdesc.h 7.1 (Berkeley) 5/7/91 39 * $Id: bpfdesc.h,v 1.5 1993/05/18 18:19:52 cgd Exp $ 40 */ 41 42 #ifndef _NET_BPFDESC_H_ 43 #define _NET_BPFDESC_H_ 44 45 /* 46 * Descriptor associated with each open bpf file. 47 */ 48 struct bpf_d { 49 struct bpf_d *bd_next; /* Linked list of descriptors */ 50 /* 51 * Buffer slots: two mbuf clusters buffer the incoming packets. 52 * The model has three slots. Sbuf is always occupied. 53 * sbuf (store) - Receive interrupt puts packets here. 54 * hbuf (hold) - When sbuf is full, put cluster here and 55 * wakeup read (replace sbuf with fbuf). 56 * fbuf (free) - When read is done, put cluster here. 57 * On receiving, if sbuf is full and fbuf is 0, packet is dropped. 58 */ 59 caddr_t bd_sbuf; /* store slot */ 60 caddr_t bd_hbuf; /* hold slot */ 61 caddr_t bd_fbuf; /* free slot */ 62 int bd_slen; /* current length of store buffer */ 63 int bd_hlen; /* current length of hold buffer */ 64 65 int bd_bufsize; /* absolute length of buffers */ 66 67 struct bpf_if * bd_bif; /* interface descriptor */ 68 u_long bd_rtout; /* Read timeout in 'ticks' */ 69 struct bpf_insn *bd_filter; /* filter code */ 70 u_long bd_rcount; /* number of packets received */ 71 u_long bd_dcount; /* number of packets dropped */ 72 73 u_char bd_promisc; /* true if listening promiscuously */ 74 u_char bd_state; /* idle, waiting, or timed out */ 75 u_char bd_immediate; /* true to return on packet arrival */ 76 #if (BSD <= 199103) && !defined(__386BSD__) 77 u_char bd_selcoll; /* true if selects collide */ 78 int bd_timedout; 79 struct proc * bd_selproc; /* process that last selected us */ 80 #else /* BSD > 199103 */ 81 u_char bd_pad; /* explicit alignment */ 82 struct selinfo bd_sel; /* bsd select info */ 83 #endif 84 }; 85 86 /* 87 * Descriptor associated with each attached hardware interface. 88 */ 89 struct bpf_if { 90 struct bpf_if *bif_next; /* list of all interfaces */ 91 struct bpf_d *bif_dlist; /* descriptor list */ 92 struct bpf_if **bif_driverp; /* pointer into softc */ 93 u_int bif_dlt; /* link layer type */ 94 u_int bif_hdrlen; /* length of header (with padding) */ 95 struct ifnet *bif_ifp; /* correspoding interface */ 96 }; 97 98 #endif /* !_NET_BPFDESC_H_ */ 99