Annotation of embedaddon/libnet/include/bpf.h, revision 1.1
1.1 ! misho 1: /*-
! 2: * Copyright (c) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997
! 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 7.1 (Berkeley) 5/7/91
! 39: *
! 40: * @(#) $Header: /usr/local/CVS/libnet/include/bpf.h,v 1.1.1.1 2003/06/26 21:55:10 route Exp $ (LBL)
! 41: */
! 42:
! 43: #ifndef BPF_MAJOR_VERSION
! 44:
! 45: /* BSD style release date */
! 46: #define BPF_RELEASE 199606
! 47:
! 48: typedef int bpf_int32;
! 49: typedef u_int bpf_u_int32;
! 50:
! 51: /*
! 52: * Alignment macros. BPF_WORDALIGN rounds up to the next
! 53: * even multiple of BPF_ALIGNMENT.
! 54: */
! 55: #define BPF_ALIGNMENT sizeof(bpf_int32)
! 56: #define BPF_WORDALIGN(x) (((x)+(BPF_ALIGNMENT-1))&~(BPF_ALIGNMENT-1))
! 57:
! 58: #define BPF_MAXINSNS 512
! 59: #define BPF_MAXBUFSIZE 0x8000
! 60: #define BPF_MINBUFSIZE 32
! 61:
! 62: /*
! 63: * Structure for BIOCSETF.
! 64: */
! 65: struct bpf_program {
! 66: u_int bf_len;
! 67: struct bpf_insn *bf_insns;
! 68: };
! 69:
! 70: /*
! 71: * Struct returned by BIOCGSTATS.
! 72: */
! 73: struct bpf_stat {
! 74: u_int bs_recv; /* number of packets received */
! 75: u_int bs_drop; /* number of packets dropped */
! 76: };
! 77:
! 78: /*
! 79: * Struct return by BIOCVERSION. This represents the version number of
! 80: * the filter language described by the instruction encodings below.
! 81: * bpf understands a program iff kernel_major == filter_major &&
! 82: * kernel_minor >= filter_minor, that is, if the value returned by the
! 83: * running kernel has the same major number and a minor number equal
! 84: * equal to or less than the filter being downloaded. Otherwise, the
! 85: * results are undefined, meaning an error may be returned or packets
! 86: * may be accepted haphazardly.
! 87: * It has nothing to do with the source code version.
! 88: */
! 89: struct bpf_version {
! 90: u_short bv_major;
! 91: u_short bv_minor;
! 92: };
! 93: /* Current version number of filter architecture. */
! 94: #define BPF_MAJOR_VERSION 1
! 95: #define BPF_MINOR_VERSION 1
! 96:
! 97: /*
! 98: * BPF ioctls
! 99: *
! 100: * The first set is for compatibility with Sun's pcc style
! 101: * header files. If your using gcc, we assume that you
! 102: * have run fixincludes so the latter set should work.
! 103: */
! 104: #if (defined(sun) || defined(ibm032)) && !defined(__GNUC__)
! 105: #define BIOCGBLEN _IOR(B,102, u_int)
! 106: #define BIOCSBLEN _IOWR(B,102, u_int)
! 107: #define BIOCSETF _IOW(B,103, struct bpf_program)
! 108: #define BIOCFLUSH _IO(B,104)
! 109: #define BIOCPROMISC _IO(B,105)
! 110: #define BIOCGDLT _IOR(B,106, u_int)
! 111: #define BIOCGETIF _IOR(B,107, struct ifreq)
! 112: #define BIOCSETIF _IOW(B,108, struct ifreq)
! 113: #define BIOCSRTIMEOUT _IOW(B,109, struct timeval)
! 114: #define BIOCGRTIMEOUT _IOR(B,110, struct timeval)
! 115: #define BIOCGSTATS _IOR(B,111, struct bpf_stat)
! 116: #define BIOCIMMEDIATE _IOW(B,112, u_int)
! 117: #define BIOCVERSION _IOR(B,113, struct bpf_version)
! 118: #define BIOCSTCPF _IOW(B,114, struct bpf_program)
! 119: #define BIOCSUDPF _IOW(B,115, struct bpf_program)
! 120: #else
! 121: #define BIOCGBLEN _IOR('B',102, u_int)
! 122: #define BIOCSBLEN _IOWR('B',102, u_int)
! 123: #define BIOCSETF _IOW('B',103, struct bpf_program)
! 124: #define BIOCFLUSH _IO('B',104)
! 125: #define BIOCPROMISC _IO('B',105)
! 126: #define BIOCGDLT _IOR('B',106, u_int)
! 127: #define BIOCGETIF _IOR('B',107, struct ifreq)
! 128: #define BIOCSETIF _IOW('B',108, struct ifreq)
! 129: #define BIOCSRTIMEOUT _IOW('B',109, struct timeval)
! 130: #define BIOCGRTIMEOUT _IOR('B',110, struct timeval)
! 131: #define BIOCGSTATS _IOR('B',111, struct bpf_stat)
! 132: #define BIOCIMMEDIATE _IOW('B',112, u_int)
! 133: #define BIOCVERSION _IOR('B',113, struct bpf_version)
! 134: #define BIOCSTCPF _IOW('B',114, struct bpf_program)
! 135: #define BIOCSUDPF _IOW('B',115, struct bpf_program)
! 136: #endif
! 137:
! 138: /*
! 139: * Structure prepended to each packet.
! 140: */
! 141: struct bpf_hdr {
! 142: struct timeval bh_tstamp; /* time stamp */
! 143: bpf_u_int32 bh_caplen; /* length of captured portion */
! 144: bpf_u_int32 bh_datalen; /* original length of packet */
! 145: u_short bh_hdrlen; /* length of bpf header (this struct
! 146: plus alignment padding) */
! 147: };
! 148: /*
! 149: * Because the structure above is not a multiple of 4 bytes, some compilers
! 150: * will insist on inserting padding; hence, sizeof(struct bpf_hdr) won't work.
! 151: * Only the kernel needs to know about it; applications use bh_hdrlen.
! 152: */
! 153: #ifdef KERNEL
! 154: #define SIZEOF_BPF_HDR 18
! 155: #endif
! 156:
! 157: /*
! 158: * Data-link level type codes.
! 159: */
! 160: #define DLT_NULL 0 /* no link-layer encapsulation */
! 161: #define DLT_EN10MB 1 /* Ethernet (10Mb) */
! 162: #define DLT_EN3MB 2 /* Experimental Ethernet (3Mb) */
! 163: #define DLT_AX25 3 /* Amateur Radio AX.25 */
! 164: #define DLT_PRONET 4 /* Proteon ProNET Token Ring */
! 165: #define DLT_CHAOS 5 /* Chaos */
! 166: #define DLT_IEEE802 6 /* IEEE 802 Networks */
! 167: #define DLT_ARCNET 7 /* ARCNET */
! 168: #define DLT_SLIP 8 /* Serial Line IP */
! 169: #define DLT_PPP 9 /* Point-to-point Protocol */
! 170: #define DLT_FDDI 10 /* FDDI */
! 171: #define DLT_ATM_RFC1483 11 /* LLC/SNAP encapsulated atm */
! 172: #define DLT_RAW 12 /* raw IP */
! 173: #define DLT_SLIP_BSDOS 13 /* BSD/OS Serial Line IP */
! 174: #define DLT_PPP_BSDOS 14 /* BSD/OS Point-to-point Protocol */
! 175:
! 176: /*
! 177: * The instruction encondings.
! 178: */
! 179: /* instruction classes */
! 180: #define BPF_CLASS(code) ((code) & 0x07)
! 181: #define BPF_LD 0x00
! 182: #define BPF_LDX 0x01
! 183: #define BPF_ST 0x02
! 184: #define BPF_STX 0x03
! 185: #define BPF_ALU 0x04
! 186: #define BPF_JMP 0x05
! 187: #define BPF_RET 0x06
! 188: #define BPF_MISC 0x07
! 189:
! 190: /* ld/ldx fields */
! 191: #define BPF_SIZE(code) ((code) & 0x18)
! 192: #define BPF_W 0x00
! 193: #define BPF_H 0x08
! 194: #define BPF_B 0x10
! 195: #define BPF_MODE(code) ((code) & 0xe0)
! 196: #define BPF_IMM 0x00
! 197: #define BPF_ABS 0x20
! 198: #define BPF_IND 0x40
! 199: #define BPF_MEM 0x60
! 200: #define BPF_LEN 0x80
! 201: #define BPF_MSH 0xa0
! 202:
! 203: /* alu/jmp fields */
! 204: #define BPF_OP(code) ((code) & 0xf0)
! 205: #define BPF_ADD 0x00
! 206: #define BPF_SUB 0x10
! 207: #define BPF_MUL 0x20
! 208: #define BPF_DIV 0x30
! 209: #define BPF_OR 0x40
! 210: #define BPF_AND 0x50
! 211: #define BPF_LSH 0x60
! 212: #define BPF_RSH 0x70
! 213: #define BPF_NEG 0x80
! 214: #define BPF_JA 0x00
! 215: #define BPF_JEQ 0x10
! 216: #define BPF_JGT 0x20
! 217: #define BPF_JGE 0x30
! 218: #define BPF_JSET 0x40
! 219: #define BPF_SRC(code) ((code) & 0x08)
! 220: #define BPF_K 0x00
! 221: #define BPF_X 0x08
! 222:
! 223: /* ret - BPF_K and BPF_X also apply */
! 224: #define BPF_RVAL(code) ((code) & 0x18)
! 225: #define BPF_A 0x10
! 226:
! 227: /* misc */
! 228: #define BPF_MISCOP(code) ((code) & 0xf8)
! 229: #define BPF_TAX 0x00
! 230: #define BPF_TXA 0x80
! 231:
! 232: /*
! 233: * The instruction data structure.
! 234: */
! 235: struct bpf_insn {
! 236: u_short code;
! 237: u_char jt;
! 238: u_char jf;
! 239: bpf_int32 k;
! 240: };
! 241:
! 242: /*
! 243: * Macros for insn array initializers.
! 244: */
! 245: #define BPF_STMT(code, k) { (u_short)(code), 0, 0, k }
! 246: #define BPF_JUMP(code, k, jt, jf) { (u_short)(code), jt, jf, k }
! 247:
! 248: #ifdef KERNEL
! 249: extern u_int bpf_filter();
! 250: extern void bpfattach();
! 251: extern void bpf_tap();
! 252: extern void bpf_mtap();
! 253: #else
! 254: #if __STDC__
! 255: extern u_int bpf_filter(struct bpf_insn *, u_char *, u_int, u_int);
! 256: #endif
! 257: #endif
! 258:
! 259: /*
! 260: * Number of scratch memory words (for BPF_LD|BPF_MEM and BPF_ST).
! 261: */
! 262: #define BPF_MEMWORDS 16
! 263:
! 264: #endif
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