1 /* 2 * Copyright (c) 1990, 1991, 1993 3 * The Regents of the University of California. 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 * @(#)bpfdesc.h 8.1 (Berkeley) 6/10/93 39 * 40 * $FreeBSD: src/sys/net/bpfdesc.h,v 1.14.2.2 2001/12/17 19:32:33 jdp Exp $ 41 */ 42 43 #ifndef _NET_BPFDESC_H_ 44 #define _NET_BPFDESC_H_ 45 46 #include <sys/callout.h> 47 #include <sys/select.h> 48 49 /* 50 * Descriptor associated with each open bpf file. 51 */ 52 struct bpf_d { 53 struct bpf_d *bd_next; /* Linked list of descriptors */ 54 /* 55 * Buffer slots: two mbuf clusters buffer the incoming packets. 56 * The model has three slots. Sbuf is always occupied. 57 * sbuf (store) - Receive interrupt puts packets here. 58 * hbuf (hold) - When sbuf is full, put cluster here and 59 * wakeup read (replace sbuf with fbuf). 60 * fbuf (free) - When read is done, put cluster here. 61 * On receiving, if sbuf is full and fbuf is 0, packet is dropped. 62 */ 63 caddr_t bd_sbuf; /* store slot */ 64 caddr_t bd_hbuf; /* hold slot */ 65 caddr_t bd_fbuf; /* free slot */ 66 int bd_slen; /* current length of store buffer */ 67 int bd_hlen; /* current length of hold buffer */ 68 69 int bd_bufsize; /* absolute length of buffers */ 70 71 struct bpf_if * bd_bif; /* interface descriptor */ 72 u_long bd_rtout; /* Read timeout in 'ticks' */ 73 struct bpf_insn *bd_filter; /* filter code */ 74 u_long bd_rcount; /* number of packets received */ 75 u_long bd_dcount; /* number of packets dropped */ 76 77 u_char bd_promisc; /* true if listening promiscuously */ 78 u_char bd_state; /* idle, waiting, or timed out */ 79 u_char bd_immediate; /* true to return on packet arrival */ 80 int bd_hdrcmplt; /* false to fill in src lladdr automatically */ 81 int bd_seesent; /* true if bpf should see sent packets */ 82 int bd_async; /* non-zero if packet reception should generate signal */ 83 int bd_sig; /* signal to send upon packet reception */ 84 struct sigio * bd_sigio; /* information for async I/O */ 85 #if BSD < 199103 86 u_char bd_selcoll; /* true if selects collide */ 87 int bd_timedout; 88 struct proc * bd_selproc; /* process that last selected us */ 89 #else 90 u_char bd_pad; /* explicit alignment */ 91 struct selinfo bd_sel; /* bsd select info */ 92 #endif 93 struct callout bd_callout; /* for BPF timeouts with select */ 94 }; 95 96 /* Values for bd_state */ 97 #define BPF_IDLE 0 /* no select in progress */ 98 #define BPF_WAITING 1 /* waiting for read timeout in select */ 99 #define BPF_TIMED_OUT 2 /* read timeout has expired in select */ 100 101 /* 102 * Descriptor associated with each attached hardware interface. 103 */ 104 struct bpf_if { 105 struct bpf_if *bif_next; /* list of all interfaces */ 106 struct bpf_d *bif_dlist; /* descriptor list */ 107 u_int bif_dlt; /* link layer type */ 108 u_int bif_hdrlen; /* length of header (with padding) */ 109 struct ifnet *bif_ifp; /* corresponding interface */ 110 }; 111 112 #endif 113