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 * 4. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)bpfdesc.h 8.1 (Berkeley) 6/10/93 35 * 36 * $FreeBSD$ 37 */ 38 39 #ifndef _NET_BPFDESC_H_ 40 #define _NET_BPFDESC_H_ 41 42 #include <sys/callout.h> 43 #include <sys/selinfo.h> 44 #include <sys/queue.h> 45 46 /* 47 * Descriptor associated with each open bpf file. 48 */ 49 struct bpf_d { 50 LIST_ENTRY(bpf_d) bd_next; /* Linked list of descriptors */ 51 /* 52 * Buffer slots: two mbuf clusters buffer the incoming packets. 53 * The model has three slots. Sbuf is always occupied. 54 * sbuf (store) - Receive interrupt puts packets here. 55 * hbuf (hold) - When sbuf is full, put cluster here and 56 * wakeup read (replace sbuf with fbuf). 57 * fbuf (free) - When read is done, put cluster here. 58 * On receiving, if sbuf is full and fbuf is 0, packet is dropped. 59 */ 60 caddr_t bd_sbuf; /* store slot */ 61 caddr_t bd_hbuf; /* hold slot */ 62 caddr_t bd_fbuf; /* free slot */ 63 int bd_slen; /* current length of store buffer */ 64 int bd_hlen; /* current length of hold buffer */ 65 66 int bd_bufsize; /* absolute length of buffers */ 67 68 struct bpf_if * bd_bif; /* interface descriptor */ 69 u_long bd_rtout; /* Read timeout in 'ticks' */ 70 struct bpf_insn *bd_filter; /* filter code */ 71 u_long bd_rcount; /* number of packets received */ 72 u_long bd_dcount; /* number of packets dropped */ 73 74 u_char bd_promisc; /* true if listening promiscuously */ 75 u_char bd_state; /* idle, waiting, or timed out */ 76 u_char bd_immediate; /* true to return on packet arrival */ 77 int bd_hdrcmplt; /* false to fill in src lladdr automatically */ 78 int bd_seesent; /* true if bpf should see sent packets */ 79 int bd_async; /* non-zero if packet reception should generate signal */ 80 int bd_sig; /* signal to send upon packet reception */ 81 struct sigio * bd_sigio; /* information for async I/O */ 82 #if BSD < 199103 83 u_char bd_selcoll; /* true if selects collide */ 84 int bd_timedout; 85 struct thread * bd_selthread; /* process that last selected us */ 86 #else 87 u_char bd_pad; /* explicit alignment */ 88 struct selinfo bd_sel; /* bsd select info */ 89 #endif 90 struct mtx bd_mtx; /* mutex for this descriptor */ 91 struct callout bd_callout; /* for BPF timeouts with select */ 92 struct label *bd_label; /* MAC label for descriptor */ 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 #define BPFD_LOCK(bd) mtx_lock(&(bd)->bd_mtx) 101 #define BPFD_UNLOCK(bd) mtx_unlock(&(bd)->bd_mtx) 102 #define BPFD_LOCK_ASSERT(bd) do { \ 103 mtx_assert(&(bd)->bd_mtx, MA_OWNED); \ 104 NET_ASSERT_GIANT(); \ 105 } while (0) 106 107 /* Test whether a BPF is ready for read(). */ 108 #define bpf_ready(bd) \ 109 ((bd)->bd_hlen != 0 || \ 110 (((bd)->bd_immediate || (bd)->bd_state == BPF_TIMED_OUT) && \ 111 (bd)->bd_slen != 0)) 112 113 /* 114 * Descriptor associated with each attached hardware interface. 115 */ 116 struct bpf_if { 117 LIST_ENTRY(bpf_if) bif_next; /* list of all interfaces */ 118 LIST_HEAD(, bpf_d) bif_dlist; /* descriptor list */ 119 struct bpf_if **bif_driverp; /* pointer into softc */ 120 u_int bif_dlt; /* link layer type */ 121 u_int bif_hdrlen; /* length of header (with padding) */ 122 struct ifnet *bif_ifp; /* corresponding interface */ 123 struct mtx bif_mtx; /* mutex for interface */ 124 }; 125 126 #define BPFIF_LOCK(bif) mtx_lock(&(bif)->bif_mtx) 127 #define BPFIF_UNLOCK(bif) mtx_unlock(&(bif)->bif_mtx) 128 129 #endif 130