560a54e10c
- BIOCGDIRECTION and BIOCSDIRECTION get or set the setting determining whether incoming, outgoing, or all packets on the interface should be returned by BPF. Set to BPF_D_IN to see only incoming packets on the interface. Set to BPF_D_INOUT to see packets originating locally and remotely on the interface. Set to BPF_D_OUT to see only outgoing packets on the interface. This setting is initialized to BPF_D_INOUT by default. BIOCGSEESENT and BIOCSSEESENT are obsoleted by these but kept for backward compatibility. - BIOCFEEDBACK sets packet feedback mode. This allows injected packets to be fed back as input to the interface when output via the interface is successful. When BPF_D_INOUT direction is set, injected outgoing packet is not returned by BPF to avoid duplication. This flag is initialized to zero by default. Note that libpcap has been modified to support BPF_D_OUT direction for pcap_setdirection(3) and PCAP_D_OUT direction is functional now. Reviewed by: rwatson
142 lines
5.2 KiB
C
142 lines
5.2 KiB
C
/*-
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* Copyright (c) 1990, 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from the Stanford/CMU enet packet filter,
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* (net/enet.c) distributed as part of 4.3BSD, and code contributed
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* to Berkeley by Steven McCanne and Van Jacobson both of Lawrence
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* Berkeley Laboratory.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)bpfdesc.h 8.1 (Berkeley) 6/10/93
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*
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* $FreeBSD$
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*/
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#ifndef _NET_BPFDESC_H_
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#define _NET_BPFDESC_H_
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#include <sys/callout.h>
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#include <sys/selinfo.h>
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#include <sys/queue.h>
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#include <sys/conf.h>
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#include <net/if.h>
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/*
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* Descriptor associated with each open bpf file.
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*/
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struct bpf_d {
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LIST_ENTRY(bpf_d) bd_next; /* Linked list of descriptors */
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/*
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* Buffer slots: two malloc buffers store the incoming packets.
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* The model has three slots. Sbuf is always occupied.
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* sbuf (store) - Receive interrupt puts packets here.
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* hbuf (hold) - When sbuf is full, put buffer here and
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* wakeup read (replace sbuf with fbuf).
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* fbuf (free) - When read is done, put buffer here.
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* On receiving, if sbuf is full and fbuf is 0, packet is dropped.
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*/
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caddr_t bd_sbuf; /* store slot */
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caddr_t bd_hbuf; /* hold slot */
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caddr_t bd_fbuf; /* free slot */
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int bd_slen; /* current length of store buffer */
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int bd_hlen; /* current length of hold buffer */
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int bd_bufsize; /* absolute length of buffers */
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struct bpf_if * bd_bif; /* interface descriptor */
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u_long bd_rtout; /* Read timeout in 'ticks' */
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struct bpf_insn *bd_rfilter; /* read filter code */
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struct bpf_insn *bd_wfilter; /* write filter code */
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#ifdef BPF_JITTER
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bpf_jit_filter *bd_bfilter; /* binary filter code */
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#endif
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u_long bd_rcount; /* number of packets received */
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u_long bd_dcount; /* number of packets dropped */
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u_char bd_promisc; /* true if listening promiscuously */
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u_char bd_state; /* idle, waiting, or timed out */
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u_char bd_immediate; /* true to return on packet arrival */
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int bd_hdrcmplt; /* false to fill in src lladdr automatically */
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int bd_direction; /* select packet direction */
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int bd_feedback; /* true to feed back sent packets */
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int bd_async; /* non-zero if packet reception should generate signal */
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int bd_sig; /* signal to send upon packet reception */
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struct sigio * bd_sigio; /* information for async I/O */
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struct selinfo bd_sel; /* bsd select info */
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struct mtx bd_mtx; /* mutex for this descriptor */
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struct callout bd_callout; /* for BPF timeouts with select */
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struct label *bd_label; /* MAC label for descriptor */
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u_long bd_fcount; /* number of packets which matched filter */
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pid_t bd_pid; /* PID which created descriptor */
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int bd_locked; /* true if descriptor is locked */
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};
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/* Values for bd_state */
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#define BPF_IDLE 0 /* no select in progress */
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#define BPF_WAITING 1 /* waiting for read timeout in select */
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#define BPF_TIMED_OUT 2 /* read timeout has expired in select */
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#define BPFD_LOCK(bd) mtx_lock(&(bd)->bd_mtx)
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#define BPFD_UNLOCK(bd) mtx_unlock(&(bd)->bd_mtx)
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#define BPFD_LOCK_ASSERT(bd) do { \
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mtx_assert(&(bd)->bd_mtx, MA_OWNED); \
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NET_ASSERT_GIANT(); \
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} while (0)
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/* Test whether a BPF is ready for read(). */
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#define bpf_ready(bd) \
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((bd)->bd_hlen != 0 || \
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(((bd)->bd_immediate || (bd)->bd_state == BPF_TIMED_OUT) && \
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(bd)->bd_slen != 0))
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/*
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* External representation of the bpf descriptor
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*/
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struct xbpf_d {
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u_char bd_promisc;
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u_char bd_immediate;
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int bd_hdrcmplt;
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int bd_direction;
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int bd_feedback;
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int bd_async;
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u_long bd_rcount;
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u_long bd_dcount;
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u_long bd_fcount;
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int bd_sig;
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int bd_slen;
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int bd_hlen;
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int bd_bufsize;
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pid_t bd_pid;
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char bd_ifname[IFNAMSIZ];
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int bd_locked;
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};
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#define BPFIF_LOCK(bif) mtx_lock(&(bif)->bif_mtx)
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#define BPFIF_UNLOCK(bif) mtx_unlock(&(bif)->bif_mtx)
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#endif
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