Annotation of sys/net/bpfdesc.h, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: bpfdesc.h,v 1.17 2006/03/25 22:41:47 djm 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: #include <sys/selinfo.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: u_long bd_rdStart; /* when the read started */
! 70: struct bpf_insn *bd_rfilter; /* read filter code */
! 71: struct bpf_insn *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:
! 93: /*
! 94: * Descriptor associated with each attached hardware interface.
! 95: */
! 96: struct bpf_if {
! 97: struct bpf_if *bif_next; /* list of all interfaces */
! 98: struct bpf_d *bif_dlist; /* descriptor list */
! 99: struct bpf_if **bif_driverp; /* pointer into softc */
! 100: u_int bif_dlt; /* link layer type */
! 101: u_int bif_hdrlen; /* length of header (with padding) */
! 102: struct ifnet *bif_ifp; /* correspoding interface */
! 103: };
! 104:
! 105: #ifdef _KERNEL
! 106: int bpf_setf(struct bpf_d *, struct bpf_program *, int);
! 107: #endif /* _KERNEL */
! 108: #endif /* _NET_BPFDESC_H_ */
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