2 * SPDX-License-Identifier: BSD-2-Clause
4 * Copyright (c) 2001 Daniel Hartmeier
5 * Copyright (c) 2002,2003 Henning Brauer
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
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.
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.
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.
36 * $OpenBSD: pf_ruleset.c,v 1.2 2008/12/18 15:31:37 dhill Exp $
39 #include <sys/cdefs.h>
40 __FBSDID("$FreeBSD$");
42 #include <sys/param.h>
43 #include <sys/socket.h>
46 #include <netinet/in.h>
47 #include <netinet/in_systm.h>
48 #include <netinet/ip.h>
49 #include <netinet/tcp.h>
53 #include <net/pfvar.h>
56 #include <netinet/ip6.h>
59 #include <arpa/inet.h>
64 #define rs_malloc(x) calloc(1, x)
65 #define rs_free(x) free(x)
70 #include <sys/stdarg.h>
71 #define DPFPRINTF(format, x...) fprintf(stderr, format , ##x)
73 #define DPFPRINTF(format, x...) ((void)0)
76 struct pfctl_anchor_global pf_anchors;
77 struct pfctl_anchor pf_main_anchor;
79 #define V_pf_anchors pf_anchors
80 #undef pf_main_ruleset
81 #define pf_main_ruleset pf_main_anchor.ruleset
83 static __inline int pf_anchor_compare(struct pfctl_anchor *,
84 struct pfctl_anchor *);
85 static struct pfctl_anchor *pf_find_anchor(const char *);
87 RB_GENERATE(pfctl_anchor_global, pfctl_anchor, entry_global,
89 RB_GENERATE(pfctl_anchor_node, pfctl_anchor, entry_node, pf_anchor_compare);
92 pf_anchor_compare(struct pfctl_anchor *a, struct pfctl_anchor *b)
94 int c = strcmp(a->path, b->path);
96 return (c ? (c < 0 ? -1 : 1) : 0);
100 pf_get_ruleset_number(u_int8_t action)
105 return (PF_RULESET_SCRUB);
109 return (PF_RULESET_FILTER);
113 return (PF_RULESET_NAT);
117 return (PF_RULESET_BINAT);
121 return (PF_RULESET_RDR);
124 return (PF_RULESET_MAX);
130 pf_init_ruleset(struct pfctl_ruleset *ruleset)
134 memset(ruleset, 0, sizeof(struct pfctl_ruleset));
135 for (i = 0; i < PF_RULESET_MAX; i++) {
136 TAILQ_INIT(&ruleset->rules[i].queues[0]);
137 TAILQ_INIT(&ruleset->rules[i].queues[1]);
138 ruleset->rules[i].active.ptr = &ruleset->rules[i].queues[0];
139 ruleset->rules[i].inactive.ptr = &ruleset->rules[i].queues[1];
143 static struct pfctl_anchor *
144 pf_find_anchor(const char *path)
146 struct pfctl_anchor *key, *found;
148 key = (struct pfctl_anchor *)rs_malloc(sizeof(*key));
151 strlcpy(key->path, path, sizeof(key->path));
152 found = RB_FIND(pfctl_anchor_global, &V_pf_anchors, key);
157 struct pfctl_ruleset *
158 pf_find_ruleset(const char *path)
160 struct pfctl_anchor *anchor;
165 return (&pf_main_ruleset);
166 anchor = pf_find_anchor(path);
170 return (&anchor->ruleset);
173 struct pfctl_ruleset *
174 pf_find_or_create_ruleset(const char *path)
177 struct pfctl_ruleset *ruleset;
178 struct pfctl_anchor *anchor = NULL, *dup, *parent = NULL;
181 return (&pf_main_ruleset);
184 ruleset = pf_find_ruleset(path);
187 p = (char *)rs_malloc(MAXPATHLEN);
190 strlcpy(p, path, MAXPATHLEN);
191 while (parent == NULL && (q = strrchr(p, '/')) != NULL) {
193 if ((ruleset = pf_find_ruleset(p)) != NULL) {
194 parent = ruleset->anchor;
202 strlcpy(p, path, MAXPATHLEN);
207 while ((r = strchr(q, '/')) != NULL || *q) {
210 if (!*q || strlen(q) >= PF_ANCHOR_NAME_SIZE ||
211 (parent != NULL && strlen(parent->path) >=
212 MAXPATHLEN - PF_ANCHOR_NAME_SIZE - 1)) {
216 anchor = (struct pfctl_anchor *)rs_malloc(sizeof(*anchor));
217 if (anchor == NULL) {
221 RB_INIT(&anchor->children);
222 strlcpy(anchor->name, q, sizeof(anchor->name));
223 if (parent != NULL) {
224 strlcpy(anchor->path, parent->path,
225 sizeof(anchor->path));
226 strlcat(anchor->path, "/", sizeof(anchor->path));
228 strlcat(anchor->path, anchor->name, sizeof(anchor->path));
229 if ((dup = RB_INSERT(pfctl_anchor_global, &V_pf_anchors, anchor)) !=
231 printf("pf_find_or_create_ruleset: RB_INSERT1 "
232 "'%s' '%s' collides with '%s' '%s'\n",
233 anchor->path, anchor->name, dup->path, dup->name);
238 if (parent != NULL) {
239 anchor->parent = parent;
240 if ((dup = RB_INSERT(pfctl_anchor_node, &parent->children,
242 printf("pf_find_or_create_ruleset: "
243 "RB_INSERT2 '%s' '%s' collides with "
244 "'%s' '%s'\n", anchor->path, anchor->name,
245 dup->path, dup->name);
246 RB_REMOVE(pfctl_anchor_global, &V_pf_anchors,
253 pf_init_ruleset(&anchor->ruleset);
254 anchor->ruleset.anchor = anchor;
262 return (&anchor->ruleset);
266 pf_remove_if_empty_ruleset(struct pfctl_ruleset *ruleset)
268 struct pfctl_anchor *parent;
271 while (ruleset != NULL) {
272 if (ruleset == &pf_main_ruleset || ruleset->anchor == NULL ||
273 !RB_EMPTY(&ruleset->anchor->children) ||
274 ruleset->anchor->refcnt > 0 || ruleset->tables > 0 ||
277 for (i = 0; i < PF_RULESET_MAX; ++i)
278 if (!TAILQ_EMPTY(ruleset->rules[i].active.ptr) ||
279 !TAILQ_EMPTY(ruleset->rules[i].inactive.ptr) ||
280 ruleset->rules[i].inactive.open)
282 RB_REMOVE(pfctl_anchor_global, &V_pf_anchors, ruleset->anchor);
283 if ((parent = ruleset->anchor->parent) != NULL)
284 RB_REMOVE(pfctl_anchor_node, &parent->children,
286 rs_free(ruleset->anchor);
289 ruleset = &parent->ruleset;
293 pfctl_anchor_setup(struct pfctl_rule *r, const struct pfctl_ruleset *s,
297 struct pfctl_ruleset *ruleset;
300 r->anchor_relative = 0;
301 r->anchor_wildcard = 0;
304 path = (char *)rs_malloc(MAXPATHLEN);
308 strlcpy(path, name + 1, MAXPATHLEN);
311 r->anchor_relative = 1;
312 if (s->anchor == NULL || !s->anchor->path[0])
315 strlcpy(path, s->anchor->path, MAXPATHLEN);
316 while (name[0] == '.' && name[1] == '.' && name[2] == '/') {
318 printf("pfctl_anchor_setup: .. beyond root\n");
322 if ((p = strrchr(path, '/')) != NULL)
326 r->anchor_relative++;
330 strlcat(path, "/", MAXPATHLEN);
331 strlcat(path, name, MAXPATHLEN);
333 if ((p = strrchr(path, '/')) != NULL && !strcmp(p, "/*")) {
334 r->anchor_wildcard = 1;
337 ruleset = pf_find_or_create_ruleset(path);
339 if (ruleset == NULL || ruleset->anchor == NULL) {
340 printf("pfctl_anchor_setup: ruleset\n");
343 r->anchor = ruleset->anchor;