1 /* $NetBSD: bpfdesc.h,v 1.11 1995/09/27 18:30:42 thorpej 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. All advertising materials mentioning features or use of this software 21 * must display the following acknowledgement: 22 * This product includes software developed by the University of 23 * California, Berkeley and its contributors. 24 * 4. Neither the name of the University nor the names of its contributors 25 * may be used to endorse or promote products derived from this software 26 * without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 38 * SUCH DAMAGE. 39 * 40 * @(#)bpfdesc.h 8.1 (Berkeley) 6/10/93 41 */ 42 43 #include <sys/select.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 int bd_async; /* non-zero if packet reception should generate signal */ 77 int bd_sig; /* signal to send upon packet reception */ 78 pid_t bd_pgid; /* process or group id for signal */ 79 #if BSD < 199103 80 u_char bd_selcoll; /* true if selects collide */ 81 int bd_timedout; 82 struct proc * bd_selproc; /* process that last selected us */ 83 #else 84 u_char bd_pad; /* explicit alignment */ 85 struct selinfo bd_sel; /* bsd select info */ 86 #endif 87 }; 88 89 /* 90 * Descriptor associated with each attached hardware interface. 91 */ 92 struct bpf_if { 93 struct bpf_if *bif_next; /* list of all interfaces */ 94 struct bpf_d *bif_dlist; /* descriptor list */ 95 struct bpf_if **bif_driverp; /* pointer into softc */ 96 u_int bif_dlt; /* link layer type */ 97 u_int bif_hdrlen; /* length of header (with padding) */ 98 struct ifnet *bif_ifp; /* correspoding interface */ 99 }; 100 101 #ifdef _KERNEL 102 int bpf_setf __P((struct bpf_d *, struct bpf_program *)); 103 #endif 104