1 /* $OpenBSD: bpfdesc.h,v 1.31 2016/08/22 10:40:36 mpi Exp $ */ 2 /* $NetBSD: bpfdesc.h,v 1.11 1995/09/27 18:30:42 thorpej Exp $ */ 3 4 /* 5 * Copyright (c) 1990, 1991, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * This code is derived from the Stanford/CMU enet packet filter, 9 * (net/enet.c) distributed as part of 4.3BSD, and code contributed 10 * to Berkeley by Steven McCanne and Van Jacobson both of Lawrence 11 * Berkeley Laboratory. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 * 37 * @(#)bpfdesc.h 8.1 (Berkeley) 6/10/93 38 */ 39 40 #ifndef _NET_BPFDESC_H_ 41 #define _NET_BPFDESC_H_ 42 43 #ifdef _KERNEL 44 45 /* 46 * Descriptor associated with each open bpf file. 47 */ 48 struct bpf_d { 49 SRPL_ENTRY(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 u_long bd_rdStart; /* when the read started */ 70 struct srp bd_rfilter; /* read filter code */ 71 struct srp bd_wfilter; /* write filter code */ 72 u_long bd_rcount; /* number of packets received */ 73 u_long bd_dcount; /* number of packets dropped */ 74 75 u_char bd_promisc; /* true if listening promiscuously */ 76 u_char bd_state; /* idle, waiting, or timed out */ 77 u_char bd_immediate; /* true to return on packet arrival */ 78 u_char bd_locked; /* true if descriptor is locked */ 79 u_char bd_fildrop; /* true if filtered packets will be dropped */ 80 u_char bd_dirfilt; /* direction filter */ 81 int bd_hdrcmplt; /* false to fill in src lladdr automatically */ 82 int bd_async; /* non-zero if packet reception should generate signal */ 83 int bd_sig; /* signal to send upon packet reception */ 84 pid_t bd_pgid; /* process or group id for signal */ 85 uid_t bd_siguid; /* uid for process that set pgid */ 86 uid_t bd_sigeuid; /* euid for process that set pgid */ 87 u_int bd_ref; /* reference count */ 88 struct selinfo bd_sel; /* bsd select info */ 89 int bd_unit; /* logical unit number */ 90 LIST_ENTRY(bpf_d) bd_list; /* descriptor list */ 91 92 struct task bd_wake_task; /* delay csignal() and selwakeup() */ 93 }; 94 95 /* 96 * Descriptor associated with each attached hardware interface. 97 */ 98 struct bpf_if { 99 struct bpf_if *bif_next; /* list of all interfaces */ 100 SRPL_HEAD(, bpf_d) bif_dlist; /* descriptor list */ 101 struct bpf_if **bif_driverp; /* pointer into softc */ 102 u_int bif_dlt; /* link layer type */ 103 u_int bif_hdrlen; /* length of header (with padding) */ 104 struct ifnet *bif_ifp; /* corresponding interface */ 105 }; 106 107 int bpf_setf(struct bpf_d *, struct bpf_program *, int); 108 #endif /* _KERNEL */ 109 #endif /* _NET_BPFDESC_H_ */ 110