2 * Copyright (c) 1996 - 2001 Brian Somers <brian@Awfulhak.org>
3 * based on work by Toshiharu OHNO <tony-o@iij.ad.jp>
4 * Internet Initiative Japan, Inc (IIJ)
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * $FreeBSD: src/usr.sbin/ppp/filter.c,v 1.39.2.7 2002/09/01 02:12:26 brian Exp $
31 #include <sys/param.h>
32 #include <netinet/in.h>
34 #include <netinet/in_systm.h>
35 #include <netinet/ip.h>
36 #include <sys/socket.h>
52 #include "throughput.h"
59 #include "slcompress.h"
63 #include "descriptor.h"
73 static unsigned filter_Nam2Op(const char *);
76 ParsePort(const char *service, const char *proto)
78 struct servent *servent;
82 servent = getservbyname(service, proto);
84 return ntohs(servent->s_port);
86 port = strtol(service, &cp, 0);
88 log_Printf(LogWARN, "ParsePort: %s is not a port name or number.\n",
96 * ICMP Syntax: src eq icmp_message_type
99 ParseIcmp(int argc, char const *const *argv, struct filterent *tgt)
106 /* permit/deny all ICMP types */
107 tgt->f_srcop = tgt->f_dstop = OP_NONE;
111 if (!strcmp(*argv, "src") && !strcmp(argv[1], "eq")) {
112 type = strtol(argv[2], &cp, 0);
114 log_Printf(LogWARN, "ParseIcmp: type is expected.\n");
117 tgt->f_srcop = OP_EQ;
118 tgt->f_srcport = type;
119 tgt->f_dstop = OP_NONE;
124 log_Printf(LogWARN, "ParseIcmp: bad icmp syntax.\n");
131 * UDP Syntax: [src op port] [dst op port]
134 ParseUdpOrTcp(int argc, char const *const *argv, const struct protoent *pe,
135 struct filterent *tgt)
137 tgt->f_srcop = tgt->f_dstop = OP_NONE;
138 tgt->f_estab = tgt->f_syn = tgt->f_finrst = 0;
140 if (argc >= 3 && !strcmp(*argv, "src")) {
141 tgt->f_srcop = filter_Nam2Op(argv[1]);
142 if (tgt->f_srcop == OP_NONE) {
143 log_Printf(LogWARN, "ParseUdpOrTcp: bad operator\n");
148 tgt->f_srcport = ParsePort(argv[2], pe->p_name);
149 if (tgt->f_srcport == 0)
155 if (argc >= 3 && !strcmp(argv[0], "dst")) {
156 tgt->f_dstop = filter_Nam2Op(argv[1]);
157 if (tgt->f_dstop == OP_NONE) {
158 log_Printf(LogWARN, "ParseUdpOrTcp: bad operator\n");
163 tgt->f_dstport = ParsePort(argv[2], pe->p_name);
164 if (tgt->f_dstport == 0)
170 if (pe && pe->p_proto == IPPROTO_TCP) {
171 for (; argc > 0; argc--, argv++)
172 if (!strcmp(*argv, "estab"))
174 else if (!strcmp(*argv, "syn"))
176 else if (!strcmp(*argv, "finrst"))
183 log_Printf(LogWARN, "ParseUdpOrTcp: bad src/dst port syntax: %s\n", *argv);
191 ParseGeneric(int argc, struct filterent *tgt)
194 * Filter currently is a catch-all. Requests are either permitted or
198 log_Printf(LogWARN, "ParseGeneric: Too many parameters\n");
201 tgt->f_srcop = tgt->f_dstop = OP_NONE;
207 addrtype(const char *addr)
209 if (!strncasecmp(addr, "MYADDR", 6) && (addr[6] == '\0' || addr[6] == '/'))
211 if (!strncasecmp(addr, "MYADDR6", 7) && (addr[7] == '\0' || addr[7] == '/'))
213 if (!strncasecmp(addr, "HISADDR", 7) && (addr[7] == '\0' || addr[7] == '/'))
215 if (!strncasecmp(addr, "HISADDR6", 8) && (addr[8] == '\0' || addr[8] == '/'))
217 if (!strncasecmp(addr, "DNS0", 4) && (addr[4] == '\0' || addr[4] == '/'))
219 if (!strncasecmp(addr, "DNS1", 4) && (addr[4] == '\0' || addr[4] == '/'))
226 addrstr(struct ncprange *addr, unsigned type)
238 return ncprange_ntoa(addr);
242 filter_Parse(struct ncp *ncp, int argc, char const *const *argv,
243 struct filterent *ofp)
248 int action, family, ruleno, val, width;
250 ruleno = strtol(*argv, &wp, 0);
251 if (*argv == wp || ruleno >= MAXFILTERS) {
252 log_Printf(LogWARN, "Parse: invalid filter number.\n");
256 for (ruleno = 0; ruleno < MAXFILTERS; ruleno++) {
257 ofp->f_action = A_NONE;
260 log_Printf(LogWARN, "Parse: filter cleared.\n");
266 log_Printf(LogWARN, "Parse: missing action.\n");
271 memset(&fe, '\0', sizeof fe);
273 val = strtol(*argv, &wp, 0);
274 if (!*wp && val >= 0 && val < MAXFILTERS) {
276 log_Printf(LogWARN, "Parse: Can only jump forward from rule %d\n",
281 } else if (!strcmp(*argv, "permit")) {
283 } else if (!strcmp(*argv, "deny")) {
285 } else if (!strcmp(*argv, "clear")) {
286 ofp->f_action = A_NONE;
289 log_Printf(LogWARN, "Parse: %s: bad action\n", *argv);
292 fe.f_action = action;
297 if (argc && argv[0][0] == '!' && !argv[0][1]) {
303 ncprange_init(&fe.f_src);
304 ncprange_init(&fe.f_dst);
308 else if ((pe = getprotobyname(*argv)) == NULL && strcmp(*argv, "all") != 0) {
310 log_Printf(LogWARN, "Parse: Protocol or address pair expected\n");
312 } else if (strcasecmp(*argv, "any") == 0 ||
313 ncprange_aton(&fe.f_src, ncp, *argv)) {
314 family = ncprange_family(&fe.f_src);
315 if (!ncprange_getwidth(&fe.f_src, &width))
318 ncprange_init(&fe.f_src);
319 fe.f_srctype = addrtype(*argv);
323 if (strcasecmp(*argv, "any") == 0 ||
324 ncprange_aton(&fe.f_dst, ncp, *argv)) {
325 if (ncprange_family(&fe.f_dst) != AF_UNSPEC &&
326 ncprange_family(&fe.f_src) != AF_UNSPEC &&
327 family != ncprange_family(&fe.f_dst)) {
328 log_Printf(LogWARN, "Parse: src and dst address families differ\n");
331 if (!ncprange_getwidth(&fe.f_dst, &width))
334 ncprange_init(&fe.f_dst);
335 fe.f_dsttype = addrtype(*argv);
339 log_Printf(LogWARN, "Parse: Protocol or address pair expected\n");
344 if ((pe = getprotobyname(*argv)) == NULL && strcmp(*argv, "all") != 0) {
345 log_Printf(LogWARN, "Parse: %s: Protocol expected\n", *argv);
353 log_Printf(LogWARN, "Parse: Protocol or address pair expected\n");
361 if (argc >= 2 && strcmp(*argv, "timeout") == 0) {
362 fe.timeout = strtoul(argv[1], NULL, 10);
368 fe.f_proto = (pe == NULL) ? 0 : pe->p_proto;
370 switch (fe.f_proto) {
377 val = ParseUdpOrTcp(argc, argv, pe, &fe);
383 val = ParseIcmp(argc, argv, &fe);
386 val = ParseGeneric(argc, &fe);
390 log_Printf(LogDEBUG, "Parse: Src: %s\n", ncprange_ntoa(&fe.f_src));
391 log_Printf(LogDEBUG, "Parse: Dst: %s\n", ncprange_ntoa(&fe.f_dst));
392 log_Printf(LogDEBUG, "Parse: Proto: %d\n", fe.f_proto);
394 log_Printf(LogDEBUG, "Parse: src: %s (%d)\n",
395 filter_Op2Nam(fe.f_srcop), fe.f_srcport);
396 log_Printf(LogDEBUG, "Parse: dst: %s (%d)\n",
397 filter_Op2Nam(fe.f_dstop), fe.f_dstport);
398 log_Printf(LogDEBUG, "Parse: estab: %u\n", fe.f_estab);
399 log_Printf(LogDEBUG, "Parse: syn: %u\n", fe.f_syn);
400 log_Printf(LogDEBUG, "Parse: finrst: %u\n", fe.f_finrst);
409 filter_Set(struct cmdargs const *arg)
411 struct filter *filter;
413 if (arg->argc < arg->argn+2)
416 if (!strcmp(arg->argv[arg->argn], "in"))
417 filter = &arg->bundle->filter.in;
418 else if (!strcmp(arg->argv[arg->argn], "out"))
419 filter = &arg->bundle->filter.out;
420 else if (!strcmp(arg->argv[arg->argn], "dial"))
421 filter = &arg->bundle->filter.dial;
422 else if (!strcmp(arg->argv[arg->argn], "alive"))
423 filter = &arg->bundle->filter.alive;
425 log_Printf(LogWARN, "filter_Set: %s: Invalid filter name.\n",
426 arg->argv[arg->argn]);
430 filter_Parse(&arg->bundle->ncp, arg->argc - arg->argn - 1,
431 arg->argv + arg->argn + 1, filter->rule);
436 filter_Action2Nam(unsigned act)
438 static const char * const actname[] = { " none ", "permit ", " deny " };
441 if (act < MAXFILTERS) {
442 snprintf(buf, sizeof buf, "%6d ", act);
444 } else if (act >= A_NONE && act < A_NONE + sizeof(actname)/sizeof(char *))
445 return actname[act - A_NONE];
451 doShowFilter(struct filterent *fp, struct prompt *prompt)
456 for (n = 0; n < MAXFILTERS; n++, fp++) {
457 if (fp->f_action != A_NONE) {
458 prompt_Printf(prompt, " %2d %s", n, filter_Action2Nam(fp->f_action));
459 prompt_Printf(prompt, "%c ", fp->f_invert ? '!' : ' ');
461 if (ncprange_isset(&fp->f_src))
462 prompt_Printf(prompt, "%s ", addrstr(&fp->f_src, fp->f_srctype));
464 prompt_Printf(prompt, "any ");
466 if (ncprange_isset(&fp->f_dst))
467 prompt_Printf(prompt, "%s ", addrstr(&fp->f_dst, fp->f_dsttype));
469 prompt_Printf(prompt, "any ");
472 if ((pe = getprotobynumber(fp->f_proto)) == NULL)
473 prompt_Printf(prompt, "P:%d", fp->f_proto);
475 prompt_Printf(prompt, "%s", pe->p_name);
478 prompt_Printf(prompt, " src %s %d", filter_Op2Nam(fp->f_srcop),
481 prompt_Printf(prompt, " dst %s %d", filter_Op2Nam(fp->f_dstop),
484 prompt_Printf(prompt, " estab");
486 prompt_Printf(prompt, " syn");
488 prompt_Printf(prompt, " finrst");
490 prompt_Printf(prompt, "all");
491 if (fp->timeout != 0)
492 prompt_Printf(prompt, " timeout %u", fp->timeout);
493 prompt_Printf(prompt, "\n");
499 filter_Show(struct cmdargs const *arg)
501 if (arg->argc > arg->argn+1)
504 if (arg->argc == arg->argn+1) {
505 struct filter *filter;
507 if (!strcmp(arg->argv[arg->argn], "in"))
508 filter = &arg->bundle->filter.in;
509 else if (!strcmp(arg->argv[arg->argn], "out"))
510 filter = &arg->bundle->filter.out;
511 else if (!strcmp(arg->argv[arg->argn], "dial"))
512 filter = &arg->bundle->filter.dial;
513 else if (!strcmp(arg->argv[arg->argn], "alive"))
514 filter = &arg->bundle->filter.alive;
517 doShowFilter(filter->rule, arg->prompt);
519 struct filter *filter[4];
522 filter[0] = &arg->bundle->filter.in;
523 filter[1] = &arg->bundle->filter.out;
524 filter[2] = &arg->bundle->filter.dial;
525 filter[3] = &arg->bundle->filter.alive;
526 for (f = 0; f < 4; f++) {
528 prompt_Printf(arg->prompt, "\n");
529 prompt_Printf(arg->prompt, "%s:\n", filter[f]->name);
530 doShowFilter(filter[f]->rule, arg->prompt);
537 static const char * const opname[] = {"none", "eq", "gt", "lt"};
540 filter_Op2Nam(unsigned op)
542 if (op >= NELEM(opname))
549 filter_Nam2Op(const char *cp)
553 for (op = NELEM(opname) - 1; op; op--)
554 if (!strcasecmp(cp, opname[op]))
561 filter_AdjustAddr(struct filter *filter, struct ncpaddr *local,
562 struct ncpaddr *remote, struct in_addr *dns)
564 struct filterent *fp;
567 for (fp = filter->rule, n = 0; n < MAXFILTERS; fp++, n++)
568 if (fp->f_action != A_NONE) {
570 if (fp->f_srctype == T_MYADDR && ncpaddr_family(local) == AF_INET)
571 ncprange_sethost(&fp->f_src, local);
572 if (fp->f_dsttype == T_MYADDR && ncpaddr_family(local) == AF_INET)
573 ncprange_sethost(&fp->f_dst, local);
575 if (fp->f_srctype == T_MYADDR6 && ncpaddr_family(local) == AF_INET6)
576 ncprange_sethost(&fp->f_src, local);
577 if (fp->f_dsttype == T_MYADDR6 && ncpaddr_family(local) == AF_INET6)
578 ncprange_sethost(&fp->f_dst, local);
582 if (fp->f_srctype == T_HISADDR && ncpaddr_family(remote) == AF_INET)
583 ncprange_sethost(&fp->f_src, remote);
584 if (fp->f_dsttype == T_HISADDR && ncpaddr_family(remote) == AF_INET)
585 ncprange_sethost(&fp->f_dst, remote);
587 if (fp->f_srctype == T_HISADDR6 && ncpaddr_family(remote) == AF_INET6)
588 ncprange_sethost(&fp->f_src, remote);
589 if (fp->f_dsttype == T_HISADDR6 && ncpaddr_family(remote) == AF_INET6)
590 ncprange_sethost(&fp->f_dst, remote);
594 if (fp->f_srctype == T_DNS0)
595 ncprange_setip4host(&fp->f_src, dns[0]);
596 if (fp->f_dsttype == T_DNS0)
597 ncprange_setip4host(&fp->f_dst, dns[0]);
598 if (fp->f_srctype == T_DNS1)
599 ncprange_setip4host(&fp->f_src, dns[1]);
600 if (fp->f_dsttype == T_DNS1)
601 ncprange_setip4host(&fp->f_dst, dns[1]);