1 /* $OpenBSD: bpf_image.c,v 1.9 2004/01/27 06:58:02 tedu Exp $ */ 2 3 /* 4 * Copyright (c) 1990, 1991, 1992, 1994, 1995, 1996 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that: (1) source code distributions 9 * retain the above copyright notice and this paragraph in its entirety, (2) 10 * distributions including binary code include the above copyright notice and 11 * this paragraph in its entirety in the documentation or other materials 12 * provided with the distribution, and (3) all advertising materials mentioning 13 * features or use of this software display the following acknowledgement: 14 * ``This product includes software developed by the University of California, 15 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of 16 * the University nor the names of its contributors may be used to endorse 17 * or promote products derived from this software without specific prior 18 * written permission. 19 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED 20 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF 21 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 22 */ 23 24 #include <sys/types.h> 25 #include <sys/time.h> 26 27 #include <stdio.h> 28 #include <string.h> 29 30 #include "pcap-int.h" 31 32 #ifdef HAVE_OS_PROTO_H 33 #include "os-proto.h" 34 #endif 35 36 char * 37 bpf_image(p, n) 38 struct bpf_insn *p; 39 int n; 40 { 41 int v; 42 char *fmt, *op; 43 static char image[256]; 44 char operand[64]; 45 46 v = p->k; 47 switch (p->code) { 48 49 default: 50 op = "unimp"; 51 fmt = "0x%x"; 52 v = p->code; 53 break; 54 55 case BPF_RET|BPF_K: 56 op = "ret"; 57 fmt = "#%d"; 58 break; 59 60 case BPF_RET|BPF_A: 61 op = "ret"; 62 fmt = ""; 63 break; 64 65 case BPF_LD|BPF_W|BPF_ABS: 66 op = "ld"; 67 fmt = "[%d]"; 68 break; 69 70 case BPF_LD|BPF_H|BPF_ABS: 71 op = "ldh"; 72 fmt = "[%d]"; 73 break; 74 75 case BPF_LD|BPF_B|BPF_ABS: 76 op = "ldb"; 77 fmt = "[%d]"; 78 break; 79 80 case BPF_LD|BPF_W|BPF_LEN: 81 op = "ld"; 82 fmt = "#pktlen"; 83 break; 84 85 case BPF_LD|BPF_W|BPF_IND: 86 op = "ld"; 87 fmt = "[x + %d]"; 88 break; 89 90 case BPF_LD|BPF_H|BPF_IND: 91 op = "ldh"; 92 fmt = "[x + %d]"; 93 break; 94 95 case BPF_LD|BPF_B|BPF_IND: 96 op = "ldb"; 97 fmt = "[x + %d]"; 98 break; 99 100 case BPF_LD|BPF_IMM: 101 op = "ld"; 102 fmt = "#0x%x"; 103 break; 104 105 case BPF_LDX|BPF_IMM: 106 op = "ldx"; 107 fmt = "#0x%x"; 108 break; 109 110 case BPF_LDX|BPF_MSH|BPF_B: 111 op = "ldxb"; 112 fmt = "4*([%d]&0xf)"; 113 break; 114 115 case BPF_LD|BPF_MEM: 116 op = "ld"; 117 fmt = "M[%d]"; 118 break; 119 120 case BPF_LDX|BPF_MEM: 121 op = "ldx"; 122 fmt = "M[%d]"; 123 break; 124 125 case BPF_ST: 126 op = "st"; 127 fmt = "M[%d]"; 128 break; 129 130 case BPF_STX: 131 op = "stx"; 132 fmt = "M[%d]"; 133 break; 134 135 case BPF_JMP|BPF_JA: 136 op = "ja"; 137 fmt = "%d"; 138 v = n + 1 + p->k; 139 break; 140 141 case BPF_JMP|BPF_JGT|BPF_K: 142 op = "jgt"; 143 fmt = "#0x%x"; 144 break; 145 146 case BPF_JMP|BPF_JGE|BPF_K: 147 op = "jge"; 148 fmt = "#0x%x"; 149 break; 150 151 case BPF_JMP|BPF_JEQ|BPF_K: 152 op = "jeq"; 153 fmt = "#0x%x"; 154 break; 155 156 case BPF_JMP|BPF_JSET|BPF_K: 157 op = "jset"; 158 fmt = "#0x%x"; 159 break; 160 161 case BPF_JMP|BPF_JGT|BPF_X: 162 op = "jgt"; 163 fmt = "x"; 164 break; 165 166 case BPF_JMP|BPF_JGE|BPF_X: 167 op = "jge"; 168 fmt = "x"; 169 break; 170 171 case BPF_JMP|BPF_JEQ|BPF_X: 172 op = "jeq"; 173 fmt = "x"; 174 break; 175 176 case BPF_JMP|BPF_JSET|BPF_X: 177 op = "jset"; 178 fmt = "x"; 179 break; 180 181 case BPF_ALU|BPF_ADD|BPF_X: 182 op = "add"; 183 fmt = "x"; 184 break; 185 186 case BPF_ALU|BPF_SUB|BPF_X: 187 op = "sub"; 188 fmt = "x"; 189 break; 190 191 case BPF_ALU|BPF_MUL|BPF_X: 192 op = "mul"; 193 fmt = "x"; 194 break; 195 196 case BPF_ALU|BPF_DIV|BPF_X: 197 op = "div"; 198 fmt = "x"; 199 break; 200 201 case BPF_ALU|BPF_AND|BPF_X: 202 op = "and"; 203 fmt = "x"; 204 break; 205 206 case BPF_ALU|BPF_OR|BPF_X: 207 op = "or"; 208 fmt = "x"; 209 break; 210 211 case BPF_ALU|BPF_LSH|BPF_X: 212 op = "lsh"; 213 fmt = "x"; 214 break; 215 216 case BPF_ALU|BPF_RSH|BPF_X: 217 op = "rsh"; 218 fmt = "x"; 219 break; 220 221 case BPF_ALU|BPF_ADD|BPF_K: 222 op = "add"; 223 fmt = "#%d"; 224 break; 225 226 case BPF_ALU|BPF_SUB|BPF_K: 227 op = "sub"; 228 fmt = "#%d"; 229 break; 230 231 case BPF_ALU|BPF_MUL|BPF_K: 232 op = "mul"; 233 fmt = "#%d"; 234 break; 235 236 case BPF_ALU|BPF_DIV|BPF_K: 237 op = "div"; 238 fmt = "#%d"; 239 break; 240 241 case BPF_ALU|BPF_AND|BPF_K: 242 op = "and"; 243 fmt = "#0x%x"; 244 break; 245 246 case BPF_ALU|BPF_OR|BPF_K: 247 op = "or"; 248 fmt = "#0x%x"; 249 break; 250 251 case BPF_ALU|BPF_LSH|BPF_K: 252 op = "lsh"; 253 fmt = "#%d"; 254 break; 255 256 case BPF_ALU|BPF_RSH|BPF_K: 257 op = "rsh"; 258 fmt = "#%d"; 259 break; 260 261 case BPF_ALU|BPF_NEG: 262 op = "neg"; 263 fmt = ""; 264 break; 265 266 case BPF_MISC|BPF_TAX: 267 op = "tax"; 268 fmt = ""; 269 break; 270 271 case BPF_MISC|BPF_TXA: 272 op = "txa"; 273 fmt = ""; 274 break; 275 } 276 (void)snprintf(operand, sizeof operand, fmt, v); 277 (void)snprintf(image, sizeof image, 278 (BPF_CLASS(p->code) == BPF_JMP && 279 BPF_OP(p->code) != BPF_JA) ? 280 "(%03d) %-8s %-16s jt %d\tjf %d" 281 : "(%03d) %-8s %s", 282 n, op, operand, n + 1 + p->jt, n + 1 + p->jf); 283 return image; 284 } 285