1 /* $NetBSD: bpfdesc.h,v 1.20 2004/05/29 14:18:33 darrenr Exp $ */ 2 3 /* 4 * Copyright (c) 1990, 1991, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from the Stanford/CMU enet packet filter, 8 * (net/enet.c) distributed as part of 4.3BSD, and code contributed 9 * to Berkeley by Steven McCanne and Van Jacobson both of Lawrence 10 * Berkeley Laboratory. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)bpfdesc.h 8.1 (Berkeley) 6/10/93 37 * 38 * @(#) Header: bpfdesc.h,v 1.14 96/06/16 22:28:07 leres Exp (LBL) 39 */ 40 41 #ifndef _NET_BPFDESC_H_ 42 #define _NET_BPFDESC_H_ 43 44 #include <sys/callout.h> 45 #include <sys/select.h> 46 47 /* 48 * Descriptor associated with each open bpf file. 49 */ 50 struct bpf_d { 51 struct bpf_d *bd_next; /* Linked list of descriptors */ 52 /* 53 * Buffer slots: two mbuf clusters buffer the incoming packets. 54 * The model has three slots. Sbuf is always occupied. 55 * sbuf (store) - Receive interrupt puts packets here. 56 * hbuf (hold) - When sbuf is full, put cluster here and 57 * wakeup read (replace sbuf with fbuf). 58 * fbuf (free) - When read is done, put cluster here. 59 * On receiving, if sbuf is full and fbuf is 0, packet is dropped. 60 */ 61 caddr_t bd_sbuf; /* store slot */ 62 caddr_t bd_hbuf; /* hold slot */ 63 caddr_t bd_fbuf; /* free slot */ 64 int bd_slen; /* current length of store buffer */ 65 int bd_hlen; /* current length of hold buffer */ 66 67 int bd_bufsize; /* absolute length of buffers */ 68 69 struct bpf_if * bd_bif; /* interface descriptor */ 70 u_long bd_rtout; /* Read timeout in 'ticks' */ 71 struct bpf_insn *bd_filter; /* filter code */ 72 u_long bd_rcount; /* number of packets received */ 73 u_long bd_dcount; /* number of packets dropped */ 74 u_long bd_ccount; /* number of packets captured */ 75 76 u_char bd_promisc; /* true if listening promiscuously */ 77 u_char bd_state; /* idle, waiting, or timed out */ 78 u_char bd_immediate; /* true to return on packet arrival */ 79 int bd_hdrcmplt; /* false to fill in src lladdr */ 80 int bd_seesent; /* true if bpf should see sent packets */ 81 int bd_async; /* non-zero if packet reception should generate signal */ 82 pid_t bd_pgid; /* process or group id for signal */ 83 #if BSD < 199103 84 u_char bd_selcoll; /* true if selects collide */ 85 int bd_timedout; 86 struct proc * bd_selproc; /* process that last selected us */ 87 #else 88 u_char bd_pad; /* explicit alignment */ 89 struct selinfo bd_sel; /* bsd select info */ 90 #endif 91 struct callout bd_callout; /* for BPF timeouts with select */ 92 }; 93 94 95 /* Values for bd_state */ 96 #define BPF_IDLE 0 /* no select in progress */ 97 #define BPF_WAITING 1 /* waiting for read timeout in select */ 98 #define BPF_TIMED_OUT 2 /* read timeout has expired in select */ 99 100 /* 101 * Descriptor associated with each attached hardware interface. 102 */ 103 struct bpf_if { 104 struct bpf_if *bif_next; /* list of all interfaces */ 105 struct bpf_d *bif_dlist; /* descriptor list */ 106 struct bpf_if **bif_driverp; /* pointer into softc */ 107 u_int bif_dlt; /* link layer type */ 108 u_int bif_hdrlen; /* length of header (with padding) */ 109 struct ifnet *bif_ifp; /* correspoding interface */ 110 }; 111 112 #ifdef _KERNEL 113 int bpf_setf __P((struct bpf_d *, struct bpf_program *)); 114 #endif 115 116 #endif /* _NET_BPFDESC_H_ */ 117