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 * %sccs.include.redist.c% 11 * 12 * @(#)bpf.h 8.2 (Berkeley) 01/09/95 13 * 14 * @(#) $Header: bpf.h,v 1.24 91/10/27 21:22:32 mccanne Exp $ (LBL) 15 */ 16 17 /* 18 * Alignment macros. BPF_WORDALIGN rounds up to the next 19 * even multiple of BPF_ALIGNMENT. 20 */ 21 #define BPF_ALIGNMENT sizeof(long) 22 #define BPF_WORDALIGN(x) (((x)+(BPF_ALIGNMENT-1))&~(BPF_ALIGNMENT-1)) 23 24 #define BPF_MAXINSNS 512 25 #define BPF_MAXBUFSIZE 0x8000 26 #define BPF_MINBUFSIZE 32 27 28 /* 29 * Structure for BIOCSETF. 30 */ 31 struct bpf_program { 32 u_int bf_len; 33 struct bpf_insn *bf_insns; 34 }; 35 36 /* 37 * Struct returned by BIOCGSTATS. 38 */ 39 struct bpf_stat { 40 u_int bs_recv; /* number of packets received */ 41 u_int bs_drop; /* number of packets dropped */ 42 }; 43 44 /* 45 * Struct return by BIOCVERSION. This represents the version number of 46 * the filter language described by the instruction encodings below. 47 * bpf understands a program iff kernel_major == filter_major && 48 * kernel_minor >= filter_minor, that is, if the value returned by the 49 * running kernel has the same major number and a minor number equal 50 * equal to or less than the filter being downloaded. Otherwise, the 51 * results are undefined, meaning an error may be returned or packets 52 * may be accepted haphazardly. 53 * It has nothing to do with the source code version. 54 */ 55 struct bpf_version { 56 u_short bv_major; 57 u_short bv_minor; 58 }; 59 /* Current version number. */ 60 #define BPF_MAJOR_VERSION 1 61 #define BPF_MINOR_VERSION 1 62 63 /* 64 * BPF ioctls 65 * 66 * The first set is for compatibility with Sun's pcc style 67 * header files. If your using gcc, we assume that you 68 * have run fixincludes so the latter set should work. 69 */ 70 #if (defined(sun) || defined(ibm032)) && !defined(__GNUC__) 71 #define BIOCGBLEN _IOR(B,102, u_int) 72 #define BIOCSBLEN _IOWR(B,102, u_int) 73 #define BIOCSETF _IOW(B,103, struct bpf_program) 74 #define BIOCFLUSH _IO(B,104) 75 #define BIOCPROMISC _IO(B,105) 76 #define BIOCGDLT _IOR(B,106, u_int) 77 #define BIOCGETIF _IOR(B,107, struct ifreq) 78 #define BIOCSETIF _IOW(B,108, struct ifreq) 79 #define BIOCSRTIMEOUT _IOW(B,109, struct timeval) 80 #define BIOCGRTIMEOUT _IOR(B,110, struct timeval) 81 #define BIOCGSTATS _IOR(B,111, struct bpf_stat) 82 #define BIOCIMMEDIATE _IOW(B,112, u_int) 83 #define BIOCVERSION _IOR(B,113, struct bpf_version) 84 #else 85 #define BIOCGBLEN _IOR('B',102, u_int) 86 #define BIOCSBLEN _IOWR('B',102, u_int) 87 #define BIOCSETF _IOW('B',103, struct bpf_program) 88 #define BIOCFLUSH _IO('B',104) 89 #define BIOCPROMISC _IO('B',105) 90 #define BIOCGDLT _IOR('B',106, u_int) 91 #define BIOCGETIF _IOR('B',107, struct ifreq) 92 #define BIOCSETIF _IOW('B',108, struct ifreq) 93 #define BIOCSRTIMEOUT _IOW('B',109, struct timeval) 94 #define BIOCGRTIMEOUT _IOR('B',110, struct timeval) 95 #define BIOCGSTATS _IOR('B',111, struct bpf_stat) 96 #define BIOCIMMEDIATE _IOW('B',112, u_int) 97 #define BIOCVERSION _IOR('B',113, struct bpf_version) 98 #endif 99 100 /* 101 * Structure prepended to each packet. 102 */ 103 struct bpf_hdr { 104 struct timeval bh_tstamp; /* time stamp */ 105 u_long bh_caplen; /* length of captured portion */ 106 u_long bh_datalen; /* original length of packet */ 107 u_short bh_hdrlen; /* length of bpf header (this struct 108 plus alignment padding) */ 109 }; 110 /* 111 * Because the structure above is not a multiple of 4 bytes, some compilers 112 * will insist on inserting padding; hence, sizeof(struct bpf_hdr) won't work. 113 * Only the kernel needs to know about it; applications use bh_hdrlen. 114 */ 115 #ifdef KERNEL 116 #define SIZEOF_BPF_HDR 18 117 #endif 118 119 /* 120 * Data-link level type codes. 121 * Currently, only DLT_EN10MB and DLT_SLIP are supported. 122 */ 123 #define DLT_NULL 0 /* no link-layer encapsulation */ 124 #define DLT_EN10MB 1 /* Ethernet (10Mb) */ 125 #define DLT_EN3MB 2 /* Experimental Ethernet (3Mb) */ 126 #define DLT_AX25 3 /* Amateur Radio AX.25 */ 127 #define DLT_PRONET 4 /* Proteon ProNET Token Ring */ 128 #define DLT_CHAOS 5 /* Chaos */ 129 #define DLT_IEEE802 6 /* IEEE 802 Networks */ 130 #define DLT_ARCNET 7 /* ARCNET */ 131 #define DLT_SLIP 8 /* Serial Line IP */ 132 #define DLT_PPP 9 /* Point-to-point Protocol */ 133 #define DLT_FDDI 10 /* FDDI */ 134 135 /* 136 * The instruction encondings. 137 */ 138 /* instruction classes */ 139 #define BPF_CLASS(code) ((code) & 0x07) 140 #define BPF_LD 0x00 141 #define BPF_LDX 0x01 142 #define BPF_ST 0x02 143 #define BPF_STX 0x03 144 #define BPF_ALU 0x04 145 #define BPF_JMP 0x05 146 #define BPF_RET 0x06 147 #define BPF_MISC 0x07 148 149 /* ld/ldx fields */ 150 #define BPF_SIZE(code) ((code) & 0x18) 151 #define BPF_W 0x00 152 #define BPF_H 0x08 153 #define BPF_B 0x10 154 #define BPF_MODE(code) ((code) & 0xe0) 155 #define BPF_IMM 0x00 156 #define BPF_ABS 0x20 157 #define BPF_IND 0x40 158 #define BPF_MEM 0x60 159 #define BPF_LEN 0x80 160 #define BPF_MSH 0xa0 161 162 /* alu/jmp fields */ 163 #define BPF_OP(code) ((code) & 0xf0) 164 #define BPF_ADD 0x00 165 #define BPF_SUB 0x10 166 #define BPF_MUL 0x20 167 #define BPF_DIV 0x30 168 #define BPF_OR 0x40 169 #define BPF_AND 0x50 170 #define BPF_LSH 0x60 171 #define BPF_RSH 0x70 172 #define BPF_NEG 0x80 173 #define BPF_JA 0x00 174 #define BPF_JEQ 0x10 175 #define BPF_JGT 0x20 176 #define BPF_JGE 0x30 177 #define BPF_JSET 0x40 178 #define BPF_SRC(code) ((code) & 0x08) 179 #define BPF_K 0x00 180 #define BPF_X 0x08 181 182 /* ret - BPF_K and BPF_X also apply */ 183 #define BPF_RVAL(code) ((code) & 0x18) 184 #define BPF_A 0x10 185 186 /* misc */ 187 #define BPF_MISCOP(code) ((code) & 0xf8) 188 #define BPF_TAX 0x00 189 #define BPF_TXA 0x80 190 191 /* 192 * The instruction data structure. 193 */ 194 struct bpf_insn { 195 u_short code; 196 u_char jt; 197 u_char jf; 198 long k; 199 }; 200 201 /* 202 * Macros for insn array initializers. 203 */ 204 #define BPF_STMT(code, k) { (u_short)(code), 0, 0, k } 205 #define BPF_JUMP(code, k, jt, jf) { (u_short)(code), jt, jf, k } 206 207 #ifdef KERNEL 208 int bpf_validate __P((struct bpf_insn *, int)); 209 int bpfopen __P((dev_t, int)); 210 int bpfclose __P((dev_t, int)); 211 int bpfread __P((dev_t, struct uio *)); 212 int bpfwrite __P((dev_t, struct uio *)); 213 int bpfioctl __P((dev_t, u_long, caddr_t, int)); 214 int bpf_select __P((dev_t, int, struct proc *)); 215 void bpf_tap __P((caddr_t, u_char *, u_int)); 216 void bpf_mtap __P((caddr_t, struct mbuf *)); 217 void bpfattach __P((caddr_t *, struct ifnet *, u_int, u_int)); 218 void bpfilterattach __P((int)); 219 u_int bpf_filter __P((struct bpf_insn *, u_char *, u_int, u_int)); 220 #endif 221 222 /* 223 * Number of scratch memory words (for BPF_LD|BPF_MEM and BPF_ST). 224 */ 225 #define BPF_MEMWORDS 16 226 227