The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/net/bpf.h

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    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  * 3. All advertising materials mentioning features or use of this software
   19  *    must display the following acknowledgement:
   20  *      This product includes software developed by the University of
   21  *      California, Berkeley and its contributors.
   22  * 4. Neither the name of the University nor the names of its contributors
   23  *    may be used to endorse or promote products derived from this software
   24  *    without specific prior written permission.
   25  *
   26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   36  * SUCH DAMAGE.
   37  *
   38  *      @(#)bpf.h       8.1 (Berkeley) 6/10/93
   39  *      @(#)bpf.h       1.34 (LBL)     6/16/96
   40  *
   41  * $FreeBSD$
   42  */
   43 
   44 #ifndef _NET_BPF_H_
   45 #define _NET_BPF_H_
   46 
   47 /* BSD style release date */
   48 #define BPF_RELEASE 199606
   49 
   50 typedef int32_t   bpf_int32;
   51 typedef u_int32_t bpf_u_int32;
   52 
   53 /*
   54  * Alignment macros.  BPF_WORDALIGN rounds up to the next
   55  * even multiple of BPF_ALIGNMENT.
   56  */
   57 #define BPF_ALIGNMENT sizeof(long)
   58 #define BPF_WORDALIGN(x) (((x)+(BPF_ALIGNMENT-1))&~(BPF_ALIGNMENT-1))
   59 
   60 #define BPF_MAXINSNS 512
   61 #define BPF_MAXBUFSIZE 0x80000
   62 #define BPF_MINBUFSIZE 32
   63 
   64 /*
   65  *  Structure for BIOCSETF.
   66  */
   67 struct bpf_program {
   68         u_int bf_len;
   69         struct bpf_insn *bf_insns;
   70 };
   71 
   72 /*
   73  * Struct returned by BIOCGSTATS.
   74  */
   75 struct bpf_stat {
   76         u_int bs_recv;          /* number of packets received */
   77         u_int bs_drop;          /* number of packets dropped */
   78 };
   79 
   80 /*
   81  * Struct return by BIOCVERSION.  This represents the version number of
   82  * the filter language described by the instruction encodings below.
   83  * bpf understands a program iff kernel_major == filter_major &&
   84  * kernel_minor >= filter_minor, that is, if the value returned by the
   85  * running kernel has the same major number and a minor number equal
   86  * equal to or less than the filter being downloaded.  Otherwise, the
   87  * results are undefined, meaning an error may be returned or packets
   88  * may be accepted haphazardly.
   89  * It has nothing to do with the source code version.
   90  */
   91 struct bpf_version {
   92         u_short bv_major;
   93         u_short bv_minor;
   94 };
   95 /* Current version number of filter architecture. */
   96 #define BPF_MAJOR_VERSION 1
   97 #define BPF_MINOR_VERSION 1
   98 
   99 #define BIOCGBLEN       _IOR('B',102, u_int)
  100 #define BIOCSBLEN       _IOWR('B',102, u_int)
  101 #define BIOCSETF        _IOW('B',103, struct bpf_program)
  102 #define BIOCFLUSH       _IO('B',104)
  103 #define BIOCPROMISC     _IO('B',105)
  104 #define BIOCGDLT        _IOR('B',106, u_int)
  105 #define BIOCGETIF       _IOR('B',107, struct ifreq)
  106 #define BIOCSETIF       _IOW('B',108, struct ifreq)
  107 #define BIOCSRTIMEOUT   _IOW('B',109, struct timeval)
  108 #define BIOCGRTIMEOUT   _IOR('B',110, struct timeval)
  109 #define BIOCGSTATS      _IOR('B',111, struct bpf_stat)
  110 #define BIOCIMMEDIATE   _IOW('B',112, u_int)
  111 #define BIOCVERSION     _IOR('B',113, struct bpf_version)
  112 #define BIOCGRSIG       _IOR('B',114, u_int)
  113 #define BIOCSRSIG       _IOW('B',115, u_int)
  114 #define BIOCGHDRCMPLT   _IOR('B',116, u_int)
  115 #define BIOCSHDRCMPLT   _IOW('B',117, u_int)
  116 #define BIOCGSEESENT    _IOR('B',118, u_int)
  117 #define BIOCSSEESENT    _IOW('B',119, u_int)
  118 
  119 /*
  120  * Structure prepended to each packet.
  121  */
  122 struct bpf_hdr {
  123         struct timeval  bh_tstamp;      /* time stamp */
  124         bpf_u_int32     bh_caplen;      /* length of captured portion */
  125         bpf_u_int32     bh_datalen;     /* original length of packet */
  126         u_short         bh_hdrlen;      /* length of bpf header (this struct
  127                                            plus alignment padding) */
  128 };
  129 /*
  130  * Because the structure above is not a multiple of 4 bytes, some compilers
  131  * will insist on inserting padding; hence, sizeof(struct bpf_hdr) won't work.
  132  * Only the kernel needs to know about it; applications use bh_hdrlen.
  133  */
  134 #ifdef _KERNEL
  135 #define SIZEOF_BPF_HDR  (sizeof(struct bpf_hdr) <= 20 ? 18 : \
  136     sizeof(struct bpf_hdr))
  137 #endif
  138 
  139 /*
  140  * Data-link level type codes.
  141  */
  142 #define DLT_NULL        0       /* BSD loopback encapsulation */
  143 #define DLT_EN10MB      1       /* Ethernet (10Mb) */
  144 #define DLT_EN3MB       2       /* Experimental Ethernet (3Mb) */
  145 #define DLT_AX25        3       /* Amateur Radio AX.25 */
  146 #define DLT_PRONET      4       /* Proteon ProNET Token Ring */
  147 #define DLT_CHAOS       5       /* Chaos */
  148 #define DLT_IEEE802     6       /* IEEE 802 Networks */
  149 #define DLT_ARCNET      7       /* ARCNET */
  150 #define DLT_SLIP        8       /* Serial Line IP */
  151 #define DLT_PPP         9       /* Point-to-point Protocol */
  152 #define DLT_FDDI        10      /* FDDI */
  153 #define DLT_ATM_RFC1483 11      /* LLC/SNAP encapsulated atm */
  154 #define DLT_RAW         12      /* raw IP */
  155 
  156 /*
  157  * These are values from BSD/OS's "bpf.h".
  158  * These are not the same as the values from the traditional libpcap
  159  * "bpf.h"; however, these values shouldn't be generated by any
  160  * OS other than BSD/OS, so the correct values to use here are the
  161  * BSD/OS values.
  162  *
  163  * Platforms that have already assigned these values to other
  164  * DLT_ codes, however, should give these codes the values
  165  * from that platform, so that programs that use these codes will
  166  * continue to compile - even though they won't correctly read
  167  * files of these types.
  168  */
  169 #define DLT_SLIP_BSDOS  15      /* BSD/OS Serial Line IP */
  170 #define DLT_PPP_BSDOS   16      /* BSD/OS Point-to-point Protocol */
  171 
  172 #define DLT_ATM_CLIP    19      /* Linux Classical-IP over ATM */
  173 
  174 /*
  175  * These values are defined by NetBSD; other platforms should refrain from
  176  * using them for other purposes, so that NetBSD savefiles with link
  177  * types of 50 or 51 can be read as this type on all platforms.
  178  */
  179 #define DLT_PPP_SERIAL  50      /* PPP over serial with HDLC encapsulation */
  180 #define DLT_PPP_ETHER   51      /* PPP over Ethernet */
  181 
  182 /*
  183  * This value was defined by libpcap 0.5; platforms that have defined
  184  * it with a different value should define it here with that value -
  185  * a link type of 104 in a save file will be mapped to DLT_C_HDLC,
  186  * whatever value that happens to be, so programs will correctly
  187  * handle files with that link type regardless of the value of
  188  * DLT_C_HDLC.
  189  *
  190  * The name DLT_C_HDLC was used by BSD/OS; we use that name for source
  191  * compatibility with programs written for BSD/OS.
  192  *
  193  * libpcap 0.5 defined it as DLT_CHDLC; we define DLT_CHDLC as well,
  194  * for source compatibility with programs written for libpcap 0.5.
  195  */
  196 #define DLT_C_HDLC      104     /* Cisco HDLC */
  197 #define DLT_CHDLC       DLT_C_HDLC
  198 
  199 #define DLT_IEEE802_11  105     /* IEEE 802.11 wireless */
  200 
  201 /*
  202  * Values between 106 and 107 are used in capture file headers as
  203  * link-layer types corresponding to DLT_ types that might differ
  204  * between platforms; don't use those values for new DLT_ new types.
  205  */
  206 
  207 /*
  208  * OpenBSD DLT_LOOP, for loopback devices; it's like DLT_NULL, except
  209  * that the AF_ type in the link-layer header is in network byte order.
  210  *
  211  * OpenBSD defines it as 12, but that collides with DLT_RAW, so we
  212  * define it as 108 here.  If OpenBSD picks up this file, it should
  213  * define DLT_LOOP as 12 in its version, as per the comment above -
  214  * and should not use 108 as a DLT_ value.
  215  */
  216 #define DLT_LOOP        108
  217 
  218 /*
  219  * Values between 109 and 112 are used in capture file headers as
  220  * link-layer types corresponding to DLT_ types that might differ
  221  * between platforms; don't use those values for new DLT_ new types.
  222  */
  223 
  224 /*
  225  * This is for Linux cooked sockets.
  226  */
  227 #define DLT_LINUX_SLL   113
  228 
  229 /*
  230  * Apple LocalTalk hardware.
  231  */
  232 #define DLT_LTALK       114
  233 
  234 /*
  235  * Acorn Econet.
  236  */
  237 #define DLT_ECONET      115
  238 
  239 /*
  240  * Reserved for use with OpenBSD ipfilter.
  241  */
  242 #define DLT_IPFILTER    116
  243 
  244 /*
  245  * Reserved for use in capture-file headers as a link-layer type
  246  * corresponding to OpenBSD DLT_PFLOG; DLT_PFLOG is 17 in OpenBSD,
  247  * but that's DLT_LANE8023 in SuSE 6.3, so we can't use 17 for it
  248  * in capture-file headers.
  249  */
  250 #define DLT_PFLOG       117
  251 
  252 /*
  253  * Registered for Cisco-internal use.
  254  */
  255 #define DLT_CISCO_IOS   118
  256 
  257 /*
  258  * Reserved for 802.11 cards using the Prism II chips, with a link-layer
  259  * header including Prism monitor mode information plus an 802.11
  260  * header.
  261  */
  262 #define DLT_PRISM_HEADER        119
  263 
  264 /*
  265  * Reserved for Aironet 802.11 cards, with an Aironet link-layer header
  266  * (see Doug Ambrisko's FreeBSD patches).
  267  */
  268 #define DLT_AIRONET_HEADER      120
  269 
  270 /*
  271  * The instruction encodings.
  272  */
  273 /* instruction classes */
  274 #define BPF_CLASS(code) ((code) & 0x07)
  275 #define         BPF_LD          0x00
  276 #define         BPF_LDX         0x01
  277 #define         BPF_ST          0x02
  278 #define         BPF_STX         0x03
  279 #define         BPF_ALU         0x04
  280 #define         BPF_JMP         0x05
  281 #define         BPF_RET         0x06
  282 #define         BPF_MISC        0x07
  283 
  284 /* ld/ldx fields */
  285 #define BPF_SIZE(code)  ((code) & 0x18)
  286 #define         BPF_W           0x00
  287 #define         BPF_H           0x08
  288 #define         BPF_B           0x10
  289 #define BPF_MODE(code)  ((code) & 0xe0)
  290 #define         BPF_IMM         0x00
  291 #define         BPF_ABS         0x20
  292 #define         BPF_IND         0x40
  293 #define         BPF_MEM         0x60
  294 #define         BPF_LEN         0x80
  295 #define         BPF_MSH         0xa0
  296 
  297 /* alu/jmp fields */
  298 #define BPF_OP(code)    ((code) & 0xf0)
  299 #define         BPF_ADD         0x00
  300 #define         BPF_SUB         0x10
  301 #define         BPF_MUL         0x20
  302 #define         BPF_DIV         0x30
  303 #define         BPF_OR          0x40
  304 #define         BPF_AND         0x50
  305 #define         BPF_LSH         0x60
  306 #define         BPF_RSH         0x70
  307 #define         BPF_NEG         0x80
  308 #define         BPF_JA          0x00
  309 #define         BPF_JEQ         0x10
  310 #define         BPF_JGT         0x20
  311 #define         BPF_JGE         0x30
  312 #define         BPF_JSET        0x40
  313 #define BPF_SRC(code)   ((code) & 0x08)
  314 #define         BPF_K           0x00
  315 #define         BPF_X           0x08
  316 
  317 /* ret - BPF_K and BPF_X also apply */
  318 #define BPF_RVAL(code)  ((code) & 0x18)
  319 #define         BPF_A           0x10
  320 
  321 /* misc */
  322 #define BPF_MISCOP(code) ((code) & 0xf8)
  323 #define         BPF_TAX         0x00
  324 #define         BPF_TXA         0x80
  325 
  326 /*
  327  * The instruction data structure.
  328  */
  329 struct bpf_insn {
  330         u_short         code;
  331         u_char          jt;
  332         u_char          jf;
  333         bpf_u_int32     k;
  334 };
  335 
  336 /*
  337  * Macros for insn array initializers.
  338  */
  339 #define BPF_STMT(code, k) { (u_short)(code), 0, 0, k }
  340 #define BPF_JUMP(code, k, jt, jf) { (u_short)(code), jt, jf, k }
  341 
  342 #ifdef _KERNEL
  343 int      bpf_validate __P((const struct bpf_insn *, int));
  344 void     bpf_tap __P((struct ifnet *, u_char *, u_int));
  345 void     bpf_mtap __P((struct ifnet *, struct mbuf *));
  346 void     bpfattach __P((struct ifnet *, u_int, u_int));
  347 void     bpfdetach __P((struct ifnet *));
  348 
  349 void     bpfilterattach __P((int));
  350 u_int    bpf_filter __P((const struct bpf_insn *, u_char *, u_int, u_int));
  351 #endif
  352 
  353 /*
  354  * Number of scratch memory words (for BPF_LD|BPF_MEM and BPF_ST).
  355  */
  356 #define BPF_MEMWORDS 16
  357 
  358 #endif

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