1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2001 Daniel Hartmeier 5 * Copyright (c) 2002,2003 Henning Brauer 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * - Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * - Redistributions in binary form must reproduce the above 15 * copyright notice, this list of conditions and the following 16 * disclaimer in the documentation and/or other materials provided 17 * with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 22 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 23 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 25 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 26 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 27 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 29 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 * 32 * Effort sponsored in part by the Defense Advanced Research Projects 33 * Agency (DARPA) and Air Force Research Laboratory, Air Force 34 * Materiel Command, USAF, under agreement number F30602-01-2-0537. 35 * 36 * $OpenBSD: pf_ruleset.c,v 1.2 2008/12/18 15:31:37 dhill Exp $ 37 */ 38 39 #include <sys/cdefs.h> 40 __FBSDID("$FreeBSD$"); 41 42 #include <sys/param.h> 43 #include <sys/socket.h> 44 #include <sys/systm.h> 45 #include <sys/refcount.h> 46 #include <sys/mbuf.h> 47 48 #include <netinet/in.h> 49 #include <netinet/in_systm.h> 50 #include <netinet/ip.h> 51 #include <netinet/tcp.h> 52 53 #include <net/if.h> 54 #include <net/vnet.h> 55 #include <net/pfvar.h> 56 57 #ifdef INET6 58 #include <netinet/ip6.h> 59 #endif /* INET6 */ 60 61 #ifndef _KERNEL 62 #error "Kernel only file. Please use sbin/pfctl/pf_ruleset.c instead." 63 #endif 64 65 #define DPFPRINTF(format, x...) \ 66 if (V_pf_status.debug >= PF_DEBUG_NOISY) \ 67 printf(format , ##x) 68 #define rs_malloc(x) malloc(x, M_TEMP, M_NOWAIT|M_ZERO) 69 #define rs_free(x) free(x, M_TEMP) 70 71 VNET_DEFINE(struct pf_kanchor_global, pf_anchors); 72 VNET_DEFINE(struct pf_kanchor, pf_main_anchor); 73 74 static __inline int pf_kanchor_compare(struct pf_kanchor *, 75 struct pf_kanchor *); 76 static struct pf_kanchor *pf_find_kanchor(const char *); 77 78 RB_GENERATE(pf_kanchor_global, pf_kanchor, entry_global, pf_kanchor_compare); 79 RB_GENERATE(pf_kanchor_node, pf_kanchor, entry_node, pf_kanchor_compare); 80 81 static __inline int 82 pf_kanchor_compare(struct pf_kanchor *a, struct pf_kanchor *b) 83 { 84 int c = strcmp(a->path, b->path); 85 86 return (c ? (c < 0 ? -1 : 1) : 0); 87 } 88 89 int 90 pf_get_ruleset_number(u_int8_t action) 91 { 92 switch (action) { 93 case PF_SCRUB: 94 case PF_NOSCRUB: 95 return (PF_RULESET_SCRUB); 96 break; 97 case PF_PASS: 98 case PF_DROP: 99 return (PF_RULESET_FILTER); 100 break; 101 case PF_NAT: 102 case PF_NONAT: 103 return (PF_RULESET_NAT); 104 break; 105 case PF_BINAT: 106 case PF_NOBINAT: 107 return (PF_RULESET_BINAT); 108 break; 109 case PF_RDR: 110 case PF_NORDR: 111 return (PF_RULESET_RDR); 112 break; 113 default: 114 return (PF_RULESET_MAX); 115 break; 116 } 117 } 118 119 static struct pf_kanchor * 120 pf_find_kanchor(const char *path) 121 { 122 struct pf_kanchor *key, *found; 123 124 key = (struct pf_kanchor *)rs_malloc(sizeof(*key)); 125 if (key == NULL) 126 return (NULL); 127 strlcpy(key->path, path, sizeof(key->path)); 128 found = RB_FIND(pf_kanchor_global, &V_pf_anchors, key); 129 rs_free(key); 130 return (found); 131 } 132 133 void 134 pf_init_kruleset(struct pf_kruleset *ruleset) 135 { 136 int i; 137 138 memset(ruleset, 0, sizeof(struct pf_kruleset)); 139 for (i = 0; i < PF_RULESET_MAX; i++) { 140 TAILQ_INIT(&ruleset->rules[i].queues[0]); 141 TAILQ_INIT(&ruleset->rules[i].queues[1]); 142 ruleset->rules[i].active.ptr = &ruleset->rules[i].queues[0]; 143 ruleset->rules[i].inactive.ptr = &ruleset->rules[i].queues[1]; 144 } 145 } 146 147 struct pf_kruleset * 148 pf_find_kruleset(const char *path) 149 { 150 struct pf_kanchor *anchor; 151 152 while (*path == '/') 153 path++; 154 if (!*path) 155 return (&pf_main_ruleset); 156 anchor = pf_find_kanchor(path); 157 if (anchor == NULL) 158 return (NULL); 159 else 160 return (&anchor->ruleset); 161 } 162 163 struct pf_kruleset * 164 pf_find_or_create_kruleset(const char *path) 165 { 166 char *p, *q, *r; 167 struct pf_kruleset *ruleset; 168 struct pf_kanchor *anchor = NULL, *dup, *parent = NULL; 169 170 if (path[0] == 0) 171 return (&pf_main_ruleset); 172 while (*path == '/') 173 path++; 174 ruleset = pf_find_kruleset(path); 175 if (ruleset != NULL) 176 return (ruleset); 177 p = (char *)rs_malloc(MAXPATHLEN); 178 if (p == NULL) 179 return (NULL); 180 strlcpy(p, path, MAXPATHLEN); 181 while (parent == NULL && (q = strrchr(p, '/')) != NULL) { 182 *q = 0; 183 if ((ruleset = pf_find_kruleset(p)) != NULL) { 184 parent = ruleset->anchor; 185 break; 186 } 187 } 188 if (q == NULL) 189 q = p; 190 else 191 q++; 192 strlcpy(p, path, MAXPATHLEN); 193 if (!*q) { 194 rs_free(p); 195 return (NULL); 196 } 197 while ((r = strchr(q, '/')) != NULL || *q) { 198 if (r != NULL) 199 *r = 0; 200 if (!*q || strlen(q) >= PF_ANCHOR_NAME_SIZE || 201 (parent != NULL && strlen(parent->path) >= 202 MAXPATHLEN - PF_ANCHOR_NAME_SIZE - 1)) { 203 rs_free(p); 204 return (NULL); 205 } 206 anchor = (struct pf_kanchor *)rs_malloc(sizeof(*anchor)); 207 if (anchor == NULL) { 208 rs_free(p); 209 return (NULL); 210 } 211 RB_INIT(&anchor->children); 212 strlcpy(anchor->name, q, sizeof(anchor->name)); 213 if (parent != NULL) { 214 strlcpy(anchor->path, parent->path, 215 sizeof(anchor->path)); 216 strlcat(anchor->path, "/", sizeof(anchor->path)); 217 } 218 strlcat(anchor->path, anchor->name, sizeof(anchor->path)); 219 if ((dup = RB_INSERT(pf_kanchor_global, &V_pf_anchors, anchor)) != 220 NULL) { 221 printf("pf_find_or_create_ruleset: RB_INSERT1 " 222 "'%s' '%s' collides with '%s' '%s'\n", 223 anchor->path, anchor->name, dup->path, dup->name); 224 rs_free(anchor); 225 rs_free(p); 226 return (NULL); 227 } 228 if (parent != NULL) { 229 anchor->parent = parent; 230 if ((dup = RB_INSERT(pf_kanchor_node, &parent->children, 231 anchor)) != NULL) { 232 printf("pf_find_or_create_ruleset: " 233 "RB_INSERT2 '%s' '%s' collides with " 234 "'%s' '%s'\n", anchor->path, anchor->name, 235 dup->path, dup->name); 236 RB_REMOVE(pf_kanchor_global, &V_pf_anchors, 237 anchor); 238 rs_free(anchor); 239 rs_free(p); 240 return (NULL); 241 } 242 } 243 pf_init_kruleset(&anchor->ruleset); 244 anchor->ruleset.anchor = anchor; 245 parent = anchor; 246 if (r != NULL) 247 q = r + 1; 248 else 249 *q = 0; 250 } 251 rs_free(p); 252 return (&anchor->ruleset); 253 } 254 255 void 256 pf_remove_if_empty_kruleset(struct pf_kruleset *ruleset) 257 { 258 struct pf_kanchor *parent; 259 int i; 260 261 while (ruleset != NULL) { 262 if (ruleset == &pf_main_ruleset || ruleset->anchor == NULL || 263 !RB_EMPTY(&ruleset->anchor->children) || 264 ruleset->anchor->refcnt > 0 || ruleset->tables > 0 || 265 ruleset->topen) 266 return; 267 for (i = 0; i < PF_RULESET_MAX; ++i) 268 if (!TAILQ_EMPTY(ruleset->rules[i].active.ptr) || 269 !TAILQ_EMPTY(ruleset->rules[i].inactive.ptr) || 270 ruleset->rules[i].inactive.open) 271 return; 272 RB_REMOVE(pf_kanchor_global, &V_pf_anchors, ruleset->anchor); 273 if ((parent = ruleset->anchor->parent) != NULL) 274 RB_REMOVE(pf_kanchor_node, &parent->children, 275 ruleset->anchor); 276 rs_free(ruleset->anchor); 277 if (parent == NULL) 278 return; 279 ruleset = &parent->ruleset; 280 } 281 } 282 283 int 284 pf_kanchor_setup(struct pf_krule *r, const struct pf_kruleset *s, 285 const char *name) 286 { 287 char *p, *path; 288 struct pf_kruleset *ruleset; 289 290 r->anchor = NULL; 291 r->anchor_relative = 0; 292 r->anchor_wildcard = 0; 293 if (!name[0]) 294 return (0); 295 path = (char *)rs_malloc(MAXPATHLEN); 296 if (path == NULL) 297 return (1); 298 if (name[0] == '/') 299 strlcpy(path, name + 1, MAXPATHLEN); 300 else { 301 /* relative path */ 302 r->anchor_relative = 1; 303 if (s->anchor == NULL || !s->anchor->path[0]) 304 path[0] = 0; 305 else 306 strlcpy(path, s->anchor->path, MAXPATHLEN); 307 while (name[0] == '.' && name[1] == '.' && name[2] == '/') { 308 if (!path[0]) { 309 DPFPRINTF("pf_anchor_setup: .. beyond root\n"); 310 rs_free(path); 311 return (1); 312 } 313 if ((p = strrchr(path, '/')) != NULL) 314 *p = 0; 315 else 316 path[0] = 0; 317 r->anchor_relative++; 318 name += 3; 319 } 320 if (path[0]) 321 strlcat(path, "/", MAXPATHLEN); 322 strlcat(path, name, MAXPATHLEN); 323 } 324 if ((p = strrchr(path, '/')) != NULL && !strcmp(p, "/*")) { 325 r->anchor_wildcard = 1; 326 *p = 0; 327 } 328 ruleset = pf_find_or_create_kruleset(path); 329 rs_free(path); 330 if (ruleset == NULL || ruleset->anchor == NULL) { 331 DPFPRINTF("pf_anchor_setup: ruleset\n"); 332 return (1); 333 } 334 r->anchor = ruleset->anchor; 335 r->anchor->refcnt++; 336 return (0); 337 } 338 339 int 340 pf_kanchor_copyout(const struct pf_kruleset *rs, const struct pf_krule *r, 341 struct pfioc_rule *pr) 342 { 343 pr->anchor_call[0] = 0; 344 if (r->anchor == NULL) 345 return (0); 346 if (!r->anchor_relative) { 347 strlcpy(pr->anchor_call, "/", sizeof(pr->anchor_call)); 348 strlcat(pr->anchor_call, r->anchor->path, 349 sizeof(pr->anchor_call)); 350 } else { 351 char *a, *p; 352 int i; 353 354 a = (char *)rs_malloc(MAXPATHLEN); 355 if (a == NULL) 356 return (1); 357 if (rs->anchor == NULL) 358 a[0] = 0; 359 else 360 strlcpy(a, rs->anchor->path, MAXPATHLEN); 361 for (i = 1; i < r->anchor_relative; ++i) { 362 if ((p = strrchr(a, '/')) == NULL) 363 p = a; 364 *p = 0; 365 strlcat(pr->anchor_call, "../", 366 sizeof(pr->anchor_call)); 367 } 368 if (strncmp(a, r->anchor->path, strlen(a))) { 369 printf("pf_anchor_copyout: '%s' '%s'\n", a, 370 r->anchor->path); 371 rs_free(a); 372 return (1); 373 } 374 if (strlen(r->anchor->path) > strlen(a)) 375 strlcat(pr->anchor_call, r->anchor->path + (a[0] ? 376 strlen(a) + 1 : 0), sizeof(pr->anchor_call)); 377 rs_free(a); 378 } 379 if (r->anchor_wildcard) 380 strlcat(pr->anchor_call, pr->anchor_call[0] ? "/*" : "*", 381 sizeof(pr->anchor_call)); 382 return (0); 383 } 384 385 void 386 pf_kanchor_remove(struct pf_krule *r) 387 { 388 if (r->anchor == NULL) 389 return; 390 if (r->anchor->refcnt <= 0) { 391 printf("pf_anchor_remove: broken refcount\n"); 392 r->anchor = NULL; 393 return; 394 } 395 if (!--r->anchor->refcnt) 396 pf_remove_if_empty_kruleset(&r->anchor->ruleset); 397 r->anchor = NULL; 398 } 399