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de5d99354f
possible for a panic to occur if BPF is in use on the interface at the time of the call to if_detach. This happens because BPF maintains pointers to the struct ifnet describing the interface, which is freed by if_detach. To correct this problem, a new call, bpfdetach, is introduced. bpfdetach locates BPF descriptor references to the interface, and NULLs them. Other BPF code is modified so that discovery of a NULL interface results in ENXIO (already implemented for some calls). Processes blocked on a BPF call will also be woken up so that they can receive ENXIO. Interface drivers that invoke bpfattach and if_detach must be modified to also call bpfattach(ifp) before calling if_detach(ifp). This is relevant for buses that support hot removal, such as pccard and usb. Patches to all effected devices will not be committed, only to if_wi.c, due to testing limitations. To reproduce the crash, load up tcpdump on you favorite pccard ethernet card, and then eject the card. As some pccard drivers do not invoke if_detach(ifp), this bug will not manifest itself for those drivers. Reviewed by: wes
247 lines
7.7 KiB
C
247 lines
7.7 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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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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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* @(#)bpf.h 8.1 (Berkeley) 6/10/93
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* @(#)bpf.h 1.34 (LBL) 6/16/96
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*
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* $FreeBSD$
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*/
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#ifndef _NET_BPF_H_
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#define _NET_BPF_H_
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/* BSD style release date */
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#define BPF_RELEASE 199606
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typedef int32_t bpf_int32;
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typedef u_int32_t bpf_u_int32;
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/*
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* Alignment macros. BPF_WORDALIGN rounds up to the next
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* even multiple of BPF_ALIGNMENT.
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*/
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#define BPF_ALIGNMENT sizeof(long)
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#define BPF_WORDALIGN(x) (((x)+(BPF_ALIGNMENT-1))&~(BPF_ALIGNMENT-1))
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#define BPF_MAXINSNS 512
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#define BPF_MAXBUFSIZE 0x80000
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#define BPF_MINBUFSIZE 32
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/*
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* Structure for BIOCSETF.
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*/
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struct bpf_program {
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u_int bf_len;
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struct bpf_insn *bf_insns;
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};
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/*
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* Struct returned by BIOCGSTATS.
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*/
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struct bpf_stat {
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u_int bs_recv; /* number of packets received */
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u_int bs_drop; /* number of packets dropped */
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};
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/*
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* Struct return by BIOCVERSION. This represents the version number of
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* the filter language described by the instruction encodings below.
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* bpf understands a program iff kernel_major == filter_major &&
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* kernel_minor >= filter_minor, that is, if the value returned by the
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* running kernel has the same major number and a minor number equal
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* equal to or less than the filter being downloaded. Otherwise, the
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* results are undefined, meaning an error may be returned or packets
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* may be accepted haphazardly.
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* It has nothing to do with the source code version.
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*/
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struct bpf_version {
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u_short bv_major;
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u_short bv_minor;
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};
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/* Current version number of filter architecture. */
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#define BPF_MAJOR_VERSION 1
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#define BPF_MINOR_VERSION 1
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#define BIOCGBLEN _IOR('B',102, u_int)
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#define BIOCSBLEN _IOWR('B',102, u_int)
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#define BIOCSETF _IOW('B',103, struct bpf_program)
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#define BIOCFLUSH _IO('B',104)
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#define BIOCPROMISC _IO('B',105)
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#define BIOCGDLT _IOR('B',106, u_int)
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#define BIOCGETIF _IOR('B',107, struct ifreq)
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#define BIOCSETIF _IOW('B',108, struct ifreq)
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#define BIOCSRTIMEOUT _IOW('B',109, struct timeval)
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#define BIOCGRTIMEOUT _IOR('B',110, struct timeval)
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#define BIOCGSTATS _IOR('B',111, struct bpf_stat)
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#define BIOCIMMEDIATE _IOW('B',112, u_int)
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#define BIOCVERSION _IOR('B',113, struct bpf_version)
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#define BIOCGRSIG _IOR('B',114, u_int)
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#define BIOCSRSIG _IOW('B',115, u_int)
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#define BIOCGHDRCMPLT _IOR('B',116, u_int)
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#define BIOCSHDRCMPLT _IOW('B',117, u_int)
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#define BIOCGSEESENT _IOR('B',118, u_int)
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#define BIOCSSEESENT _IOW('B',119, u_int)
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/*
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* Structure prepended to each packet.
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*/
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struct bpf_hdr {
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struct timeval bh_tstamp; /* time stamp */
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bpf_u_int32 bh_caplen; /* length of captured portion */
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bpf_u_int32 bh_datalen; /* original length of packet */
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u_short bh_hdrlen; /* length of bpf header (this struct
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plus alignment padding) */
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};
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/*
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* Because the structure above is not a multiple of 4 bytes, some compilers
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* will insist on inserting padding; hence, sizeof(struct bpf_hdr) won't work.
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* Only the kernel needs to know about it; applications use bh_hdrlen.
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*/
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#ifdef _KERNEL
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#define SIZEOF_BPF_HDR (sizeof(struct bpf_hdr) <= 20 ? 18 : \
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sizeof(struct bpf_hdr))
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#endif
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/*
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* Data-link level type codes.
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*/
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#define DLT_NULL 0 /* no link-layer encapsulation */
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#define DLT_EN10MB 1 /* Ethernet (10Mb) */
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#define DLT_EN3MB 2 /* Experimental Ethernet (3Mb) */
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#define DLT_AX25 3 /* Amateur Radio AX.25 */
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#define DLT_PRONET 4 /* Proteon ProNET Token Ring */
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#define DLT_CHAOS 5 /* Chaos */
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#define DLT_IEEE802 6 /* IEEE 802 Networks */
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#define DLT_ARCNET 7 /* ARCNET */
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#define DLT_SLIP 8 /* Serial Line IP */
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#define DLT_PPP 9 /* Point-to-point Protocol */
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#define DLT_FDDI 10 /* FDDI */
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#define DLT_ATM_RFC1483 11 /* LLC/SNAP encapsulated atm */
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#define DLT_RAW 12 /* raw IP */
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#define DLT_SLIP_BSDOS 13 /* BSD/OS Serial Line IP */
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#define DLT_PPP_BSDOS 14 /* BSD/OS Point-to-point Protocol */
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/*
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* The instruction encodings.
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*/
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/* instruction classes */
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#define BPF_CLASS(code) ((code) & 0x07)
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#define BPF_LD 0x00
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#define BPF_LDX 0x01
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#define BPF_ST 0x02
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#define BPF_STX 0x03
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#define BPF_ALU 0x04
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#define BPF_JMP 0x05
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#define BPF_RET 0x06
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#define BPF_MISC 0x07
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/* ld/ldx fields */
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#define BPF_SIZE(code) ((code) & 0x18)
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#define BPF_W 0x00
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#define BPF_H 0x08
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#define BPF_B 0x10
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#define BPF_MODE(code) ((code) & 0xe0)
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#define BPF_IMM 0x00
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#define BPF_ABS 0x20
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#define BPF_IND 0x40
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#define BPF_MEM 0x60
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#define BPF_LEN 0x80
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#define BPF_MSH 0xa0
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/* alu/jmp fields */
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#define BPF_OP(code) ((code) & 0xf0)
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#define BPF_ADD 0x00
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#define BPF_SUB 0x10
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#define BPF_MUL 0x20
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#define BPF_DIV 0x30
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#define BPF_OR 0x40
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#define BPF_AND 0x50
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#define BPF_LSH 0x60
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#define BPF_RSH 0x70
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#define BPF_NEG 0x80
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#define BPF_JA 0x00
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#define BPF_JEQ 0x10
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#define BPF_JGT 0x20
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#define BPF_JGE 0x30
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#define BPF_JSET 0x40
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#define BPF_SRC(code) ((code) & 0x08)
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#define BPF_K 0x00
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#define BPF_X 0x08
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/* ret - BPF_K and BPF_X also apply */
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#define BPF_RVAL(code) ((code) & 0x18)
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#define BPF_A 0x10
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/* misc */
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#define BPF_MISCOP(code) ((code) & 0xf8)
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#define BPF_TAX 0x00
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#define BPF_TXA 0x80
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/*
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* The instruction data structure.
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*/
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struct bpf_insn {
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u_short code;
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u_char jt;
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u_char jf;
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bpf_u_int32 k;
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};
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/*
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* Macros for insn array initializers.
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*/
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#define BPF_STMT(code, k) { (u_short)(code), 0, 0, k }
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#define BPF_JUMP(code, k, jt, jf) { (u_short)(code), jt, jf, k }
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#ifdef _KERNEL
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int bpf_validate __P((const struct bpf_insn *, int));
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void bpf_tap __P((struct ifnet *, u_char *, u_int));
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void bpf_mtap __P((struct ifnet *, struct mbuf *));
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void bpfattach __P((struct ifnet *, u_int, u_int));
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void bpfdetach __P((struct ifnet *));
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void bpfilterattach __P((int));
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u_int bpf_filter __P((const struct bpf_insn *, u_char *, u_int, u_int));
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#endif
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/*
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* Number of scratch memory words (for BPF_LD|BPF_MEM and BPF_ST).
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*/
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#define BPF_MEMWORDS 16
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#endif
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