xref: /freebsd/sbin/pfctl/pfctl_radix.c (revision 4b9d6057) 
1 /*	$OpenBSD: pfctl_radix.c,v 1.27 2005/05/21 21:03:58 henning Exp $ */
2 
3 /*-
4  * SPDX-License-Identifier: BSD-2-Clause
5  *
6  * Copyright (c) 2002 Cedric Berger
7  * All rights reserved.
8  *
9  * Redistribution and use in source and binary forms, with or without
10  * modification, are permitted provided that the following conditions
11  * are met:
12  *
13  *    - Redistributions of source code must retain the above copyright
14  *      notice, this list of conditions and the following disclaimer.
15  *    - Redistributions in binary form must reproduce the above
16  *      copyright notice, this list of conditions and the following
17  *      disclaimer in the documentation and/or other materials provided
18  *      with the distribution.
19  *
20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
23  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
24  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
25  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
26  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
27  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
28  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
30  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
31  * POSSIBILITY OF SUCH DAMAGE.
32  *
33  */
34 
35 #include <sys/types.h>
36 #include <sys/ioctl.h>
37 #include <sys/socket.h>
38 
39 #include <net/if.h>
40 #include <net/pfvar.h>
41 
42 #include <errno.h>
43 #include <string.h>
44 #include <ctype.h>
45 #include <stdio.h>
46 #include <stdlib.h>
47 #include <limits.h>
48 #include <err.h>
49 
50 #include "pfctl.h"
51 
52 #define BUF_SIZE 256
53 
54 extern int dev;
55 
56 static int	 pfr_next_token(char buf[BUF_SIZE], FILE *);
57 
58 static void
59 pfr_report_error(struct pfr_table *tbl, struct pfioc_table *io,
60     const char *err)
61 {
62 	unsigned long maxcount;
63 	size_t s;
64 
65 	s = sizeof(maxcount);
66 	if (sysctlbyname("net.pf.request_maxcount", &maxcount, &s, NULL,
67 	    0) == -1)
68 		return;
69 
70 	if (io->pfrio_size > maxcount || io->pfrio_size2 > maxcount)
71 		fprintf(stderr, "cannot %s %s: too many elements.\n"
72 		    "Consider increasing net.pf.request_maxcount.",
73 		    err, tbl->pfrt_name);
74 }
75 
76 int
77 pfr_clr_tables(struct pfr_table *filter, int *ndel, int flags)
78 {
79 	struct pfioc_table io;
80 
81 	bzero(&io, sizeof io);
82 	io.pfrio_flags = flags;
83 	if (filter != NULL)
84 		io.pfrio_table = *filter;
85 	if (ioctl(dev, DIOCRCLRTABLES, &io))
86 		return (-1);
87 	if (ndel != NULL)
88 		*ndel = io.pfrio_ndel;
89 	return (0);
90 }
91 
92 int
93 pfr_add_tables(struct pfr_table *tbl, int size, int *nadd, int flags)
94 {
95 	struct pfioc_table io;
96 
97 	if (size < 0 || (size && tbl == NULL)) {
98 		errno = EINVAL;
99 		return (-1);
100 	}
101 	bzero(&io, sizeof io);
102 	io.pfrio_flags = flags;
103 	io.pfrio_buffer = tbl;
104 	io.pfrio_esize = sizeof(*tbl);
105 	io.pfrio_size = size;
106 	if (ioctl(dev, DIOCRADDTABLES, &io)) {
107 		pfr_report_error(tbl, &io, "add table");
108 		return (-1);
109 	}
110 	if (nadd != NULL)
111 		*nadd = io.pfrio_nadd;
112 	return (0);
113 }
114 
115 int
116 pfr_del_tables(struct pfr_table *tbl, int size, int *ndel, int flags)
117 {
118 	struct pfioc_table io;
119 
120 	if (size < 0 || (size && tbl == NULL)) {
121 		errno = EINVAL;
122 		return (-1);
123 	}
124 	bzero(&io, sizeof io);
125 	io.pfrio_flags = flags;
126 	io.pfrio_buffer = tbl;
127 	io.pfrio_esize = sizeof(*tbl);
128 	io.pfrio_size = size;
129 	if (ioctl(dev, DIOCRDELTABLES, &io)) {
130 		pfr_report_error(tbl, &io, "delete table");
131 		return (-1);
132 	}
133 	if (ndel != NULL)
134 		*ndel = io.pfrio_ndel;
135 	return (0);
136 }
137 
138 int
139 pfr_get_tables(struct pfr_table *filter, struct pfr_table *tbl, int *size,
140 	int flags)
141 {
142 	struct pfioc_table io;
143 
144 	if (size == NULL || *size < 0 || (*size && tbl == NULL)) {
145 		errno = EINVAL;
146 		return (-1);
147 	}
148 	bzero(&io, sizeof io);
149 	io.pfrio_flags = flags;
150 	if (filter != NULL)
151 		io.pfrio_table = *filter;
152 	io.pfrio_buffer = tbl;
153 	io.pfrio_esize = sizeof(*tbl);
154 	io.pfrio_size = *size;
155 	if (ioctl(dev, DIOCRGETTABLES, &io)) {
156 		pfr_report_error(tbl, &io, "get table");
157 		return (-1);
158 	}
159 	*size = io.pfrio_size;
160 	return (0);
161 }
162 
163 int
164 pfr_get_tstats(struct pfr_table *filter, struct pfr_tstats *tbl, int *size,
165 	int flags)
166 {
167 	struct pfioc_table io;
168 
169 	if (size == NULL || *size < 0 || (*size && tbl == NULL)) {
170 		errno = EINVAL;
171 		return (-1);
172 	}
173 	bzero(&io, sizeof io);
174 	io.pfrio_flags = flags;
175 	if (filter != NULL)
176 		io.pfrio_table = *filter;
177 	io.pfrio_buffer = tbl;
178 	io.pfrio_esize = sizeof(*tbl);
179 	io.pfrio_size = *size;
180 	if (ioctl(dev, DIOCRGETTSTATS, &io)) {
181 		pfr_report_error(filter, &io, "get tstats for");
182 		return (-1);
183 	}
184 	*size = io.pfrio_size;
185 	return (0);
186 }
187 
188 int
189 pfr_clr_addrs(struct pfr_table *tbl, int *ndel, int flags)
190 {
191 	struct pfioc_table io;
192 
193 	if (tbl == NULL) {
194 		errno = EINVAL;
195 		return (-1);
196 	}
197 	bzero(&io, sizeof io);
198 	io.pfrio_flags = flags;
199 	io.pfrio_table = *tbl;
200 	if (ioctl(dev, DIOCRCLRADDRS, &io))
201 		return (-1);
202 	if (ndel != NULL)
203 		*ndel = io.pfrio_ndel;
204 	return (0);
205 }
206 
207 int
208 pfr_add_addrs(struct pfr_table *tbl, struct pfr_addr *addr, int size,
209     int *nadd, int flags)
210 {
211 	int ret;
212 
213 	ret = pfctl_table_add_addrs(dev, tbl, addr, size, nadd, flags);
214 	if (ret) {
215 		errno = ret;
216 		return (-1);
217 	}
218 	return (0);
219 }
220 
221 int
222 pfr_del_addrs(struct pfr_table *tbl, struct pfr_addr *addr, int size,
223     int *ndel, int flags)
224 {
225 	int ret;
226 
227 	ret = pfctl_table_del_addrs(dev, tbl, addr, size, ndel, flags);
228 	if (ret) {
229 		errno = ret;
230 		return (-1);
231 	}
232 	return (0);
233 }
234 
235 int
236 pfr_set_addrs(struct pfr_table *tbl, struct pfr_addr *addr, int size,
237     int *size2, int *nadd, int *ndel, int *nchange, int flags)
238 {
239 	int ret;
240 
241 	ret = pfctl_table_set_addrs(dev, tbl, addr, size, size2, nadd, ndel,
242 	    nchange, flags);
243 	if (ret) {
244 		errno = ret;
245 		return (-1);
246 	}
247 	return (0);
248 }
249 
250 int
251 pfr_get_addrs(struct pfr_table *tbl, struct pfr_addr *addr, int *size,
252     int flags)
253 {
254 	int ret;
255 
256 	ret = pfctl_table_get_addrs(dev, tbl, addr, size, flags);
257 	if (ret) {
258 		errno = ret;
259 		return (-1);
260 	}
261 	return (0);
262 }
263 
264 int
265 pfr_get_astats(struct pfr_table *tbl, struct pfr_astats *addr, int *size,
266     int flags)
267 {
268 	struct pfioc_table io;
269 
270 	if (tbl == NULL || size == NULL || *size < 0 ||
271 	    (*size && addr == NULL)) {
272 		errno = EINVAL;
273 		return (-1);
274 	}
275 	bzero(&io, sizeof io);
276 	io.pfrio_flags = flags;
277 	io.pfrio_table = *tbl;
278 	io.pfrio_buffer = addr;
279 	io.pfrio_esize = sizeof(*addr);
280 	io.pfrio_size = *size;
281 	if (ioctl(dev, DIOCRGETASTATS, &io)) {
282 		pfr_report_error(tbl, &io, "get astats from");
283 		return (-1);
284 	}
285 	*size = io.pfrio_size;
286 	return (0);
287 }
288 
289 int
290 pfr_clr_tstats(struct pfr_table *tbl, int size, int *nzero, int flags)
291 {
292 	struct pfioc_table io;
293 
294 	if (size < 0 || (size && !tbl)) {
295 		errno = EINVAL;
296 		return (-1);
297 	}
298 	bzero(&io, sizeof io);
299 	io.pfrio_flags = flags;
300 	io.pfrio_buffer = tbl;
301 	io.pfrio_esize = sizeof(*tbl);
302 	io.pfrio_size = size;
303 	if (ioctl(dev, DIOCRCLRTSTATS, &io)) {
304 		pfr_report_error(tbl, &io, "clear tstats from");
305 		return (-1);
306 	}
307 	if (nzero)
308 		*nzero = io.pfrio_nzero;
309 	return (0);
310 }
311 
312 int
313 pfr_tst_addrs(struct pfr_table *tbl, struct pfr_addr *addr, int size,
314     int *nmatch, int flags)
315 {
316 	struct pfioc_table io;
317 
318 	if (tbl == NULL || size < 0 || (size && addr == NULL)) {
319 		errno = EINVAL;
320 		return (-1);
321 	}
322 	bzero(&io, sizeof io);
323 	io.pfrio_flags = flags;
324 	io.pfrio_table = *tbl;
325 	io.pfrio_buffer = addr;
326 	io.pfrio_esize = sizeof(*addr);
327 	io.pfrio_size = size;
328 	if (ioctl(dev, DIOCRTSTADDRS, &io)) {
329 		pfr_report_error(tbl, &io, "test addresses in");
330 		return (-1);
331 	}
332 	if (nmatch)
333 		*nmatch = io.pfrio_nmatch;
334 	return (0);
335 }
336 
337 int
338 pfr_ina_define(struct pfr_table *tbl, struct pfr_addr *addr, int size,
339     int *nadd, int *naddr, int ticket, int flags)
340 {
341 	struct pfioc_table io;
342 
343 	if (tbl == NULL || size < 0 || (size && addr == NULL)) {
344 		errno = EINVAL;
345 		return (-1);
346 	}
347 	bzero(&io, sizeof io);
348 	io.pfrio_flags = flags;
349 	io.pfrio_table = *tbl;
350 	io.pfrio_buffer = addr;
351 	io.pfrio_esize = sizeof(*addr);
352 	io.pfrio_size = size;
353 	io.pfrio_ticket = ticket;
354 	if (ioctl(dev, DIOCRINADEFINE, &io)) {
355 		pfr_report_error(tbl, &io, "define inactive set table");
356 		return (-1);
357 	}
358 	if (nadd != NULL)
359 		*nadd = io.pfrio_nadd;
360 	if (naddr != NULL)
361 		*naddr = io.pfrio_naddr;
362 	return (0);
363 }
364 
365 /* interface management code */
366 
367 int
368 pfi_get_ifaces(const char *filter, struct pfi_kif *buf, int *size)
369 {
370 	struct pfioc_iface io;
371 
372 	if (size == NULL || *size < 0 || (*size && buf == NULL)) {
373 		errno = EINVAL;
374 		return (-1);
375 	}
376 	bzero(&io, sizeof io);
377 	if (filter != NULL)
378 		if (strlcpy(io.pfiio_name, filter, sizeof(io.pfiio_name)) >=
379 		    sizeof(io.pfiio_name)) {
380 			errno = EINVAL;
381 			return (-1);
382 		}
383 	io.pfiio_buffer = buf;
384 	io.pfiio_esize = sizeof(*buf);
385 	io.pfiio_size = *size;
386 	if (ioctl(dev, DIOCIGETIFACES, &io))
387 		return (-1);
388 	*size = io.pfiio_size;
389 	return (0);
390 }
391 
392 /* buffer management code */
393 
394 const size_t buf_esize[PFRB_MAX] = { 0,
395 	sizeof(struct pfr_table), sizeof(struct pfr_tstats),
396 	sizeof(struct pfr_addr), sizeof(struct pfr_astats),
397 	sizeof(struct pfi_kif), sizeof(struct pfioc_trans_e)
398 };
399 
400 /*
401  * add one element to the buffer
402  */
403 int
404 pfr_buf_add(struct pfr_buffer *b, const void *e)
405 {
406 	size_t bs;
407 
408 	if (b == NULL || b->pfrb_type <= 0 || b->pfrb_type >= PFRB_MAX ||
409 	    e == NULL) {
410 		errno = EINVAL;
411 		return (-1);
412 	}
413 	bs = buf_esize[b->pfrb_type];
414 	if (b->pfrb_size == b->pfrb_msize)
415 		if (pfr_buf_grow(b, 0))
416 			return (-1);
417 	memcpy(((caddr_t)b->pfrb_caddr) + bs * b->pfrb_size, e, bs);
418 	b->pfrb_size++;
419 	return (0);
420 }
421 
422 /*
423  * return next element of the buffer (or first one if prev is NULL)
424  * see PFRB_FOREACH macro
425  */
426 void *
427 pfr_buf_next(struct pfr_buffer *b, const void *prev)
428 {
429 	size_t bs;
430 
431 	if (b == NULL || b->pfrb_type <= 0 || b->pfrb_type >= PFRB_MAX)
432 		return (NULL);
433 	if (b->pfrb_size == 0)
434 		return (NULL);
435 	if (prev == NULL)
436 		return (b->pfrb_caddr);
437 	bs = buf_esize[b->pfrb_type];
438 	if ((((caddr_t)prev)-((caddr_t)b->pfrb_caddr)) / bs >= b->pfrb_size-1)
439 		return (NULL);
440 	return (((caddr_t)prev) + bs);
441 }
442 
443 /*
444  * minsize:
445  *    0: make the buffer somewhat bigger
446  *    n: make room for "n" entries in the buffer
447  */
448 int
449 pfr_buf_grow(struct pfr_buffer *b, int minsize)
450 {
451 	caddr_t p;
452 	size_t bs;
453 
454 	if (b == NULL || b->pfrb_type <= 0 || b->pfrb_type >= PFRB_MAX) {
455 		errno = EINVAL;
456 		return (-1);
457 	}
458 	if (minsize != 0 && minsize <= b->pfrb_msize)
459 		return (0);
460 	bs = buf_esize[b->pfrb_type];
461 	if (!b->pfrb_msize) {
462 		if (minsize < 64)
463 			minsize = 64;
464 		b->pfrb_caddr = calloc(bs, minsize);
465 		if (b->pfrb_caddr == NULL)
466 			return (-1);
467 		b->pfrb_msize = minsize;
468 	} else {
469 		if (minsize == 0)
470 			minsize = b->pfrb_msize * 2;
471 		if (minsize < 0 || minsize >= SIZE_T_MAX / bs) {
472 			/* msize overflow */
473 			errno = ENOMEM;
474 			return (-1);
475 		}
476 		p = realloc(b->pfrb_caddr, minsize * bs);
477 		if (p == NULL)
478 			return (-1);
479 		bzero(p + b->pfrb_msize * bs, (minsize - b->pfrb_msize) * bs);
480 		b->pfrb_caddr = p;
481 		b->pfrb_msize = minsize;
482 	}
483 	return (0);
484 }
485 
486 /*
487  * reset buffer and free memory.
488  */
489 void
490 pfr_buf_clear(struct pfr_buffer *b)
491 {
492 	if (b == NULL)
493 		return;
494 	if (b->pfrb_caddr != NULL)
495 		free(b->pfrb_caddr);
496 	b->pfrb_caddr = NULL;
497 	b->pfrb_size = b->pfrb_msize = 0;
498 }
499 
500 int
501 pfr_buf_load(struct pfr_buffer *b, char *file, int nonetwork,
502     int (*append_addr)(struct pfr_buffer *, char *, int))
503 {
504 	FILE	*fp;
505 	char	 buf[BUF_SIZE];
506 	int	 rv;
507 
508 	if (file == NULL)
509 		return (0);
510 	if (!strcmp(file, "-"))
511 		fp = stdin;
512 	else {
513 		fp = pfctl_fopen(file, "r");
514 		if (fp == NULL)
515 			return (-1);
516 	}
517 	while ((rv = pfr_next_token(buf, fp)) == 1)
518 		if (append_addr(b, buf, nonetwork)) {
519 			rv = -1;
520 			break;
521 		}
522 	if (fp != stdin)
523 		fclose(fp);
524 	return (rv);
525 }
526 
527 int
528 pfr_next_token(char buf[BUF_SIZE], FILE *fp)
529 {
530 	static char	next_ch = ' ';
531 	int		i = 0;
532 
533 	for (;;) {
534 		/* skip spaces */
535 		while (isspace(next_ch) && !feof(fp))
536 			next_ch = fgetc(fp);
537 		/* remove from '#' until end of line */
538 		if (next_ch == '#')
539 			while (!feof(fp)) {
540 				next_ch = fgetc(fp);
541 				if (next_ch == '\n')
542 					break;
543 			}
544 		else
545 			break;
546 	}
547 	if (feof(fp)) {
548 		next_ch = ' ';
549 		return (0);
550 	}
551 	do {
552 		if (i < BUF_SIZE)
553 			buf[i++] = next_ch;
554 		next_ch = fgetc(fp);
555 	} while (!feof(fp) && !isspace(next_ch));
556 	if (i >= BUF_SIZE) {
557 		errno = EINVAL;
558 		return (-1);
559 	}
560 	buf[i] = '\0';
561 	return (1);
562 }
563 
564 char *
565 pfr_strerror(int errnum)
566 {
567 	switch (errnum) {
568 	case ESRCH:
569 		return "Table does not exist";
570 	case ENOENT:
571 		return "Anchor or Ruleset does not exist";
572 	default:
573 		return strerror(errnum);
574 	}
575 }
576