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Annotation of sys/net/bpfdesc.h, Revision 1.1.1.1

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_ */