1/* $OpenBSD: filter.c,v 1.1 2005/12/28 19:07:07 jcs Exp $ */
2
3/*
4 * Copyright (c) 2004, 2005 Camiel Dobbelaar, <cd@sentia.nl>
5 *
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18
19#include <syslog.h>
20
21#include <sys/ioctl.h>
22#include <sys/types.h>
23#include <sys/socket.h>
24
25#include <net/if.h>
26#include <net/pfvar.h>
27#include <netinet/in.h>
28#include <netinet/tcp.h>
29#include <arpa/inet.h>
30
31#include <err.h>
32#include <errno.h>
33#include <fcntl.h>
34#include <stdio.h>
35#include <stdlib.h>
36#include <string.h>
37#include <unistd.h>
38
39#include "filter.h"
40
41/* From netinet/in.h, but only _KERNEL_ gets them. */
42#define satosin(sa) ((struct sockaddr_in *)(sa))
43#define satosin6(sa) ((struct sockaddr_in6 *)(sa))
44
45enum { TRANS_FILTER = 0, TRANS_NAT, TRANS_RDR, TRANS_SIZE };
46
47int prepare_rule(u_int32_t, int, struct sockaddr *, struct sockaddr *,
48 u_int16_t, u_int8_t);
49int server_lookup4(struct sockaddr_in *, struct sockaddr_in *,
50 struct sockaddr_in *, u_int8_t);
51int server_lookup6(struct sockaddr_in6 *, struct sockaddr_in6 *,
52 struct sockaddr_in6 *, u_int8_t);
53
54static struct pfioc_pooladdr pfp;
55static struct pfioc_rule pfr;
56static struct pfioc_trans pft;
57static struct pfioc_trans_e pfte[TRANS_SIZE];
58static int dev, rule_log;
59static char *qname;
60
61int
62add_filter(u_int32_t id, u_int8_t dir, struct sockaddr *src,
63 struct sockaddr *dst, u_int16_t d_port, u_int8_t proto)
64{
65 if (!src || !dst || !d_port || !proto) {
66 errno = EINVAL;
67 return (-1);
68 }
69
70 if (prepare_rule(id, PF_RULESET_FILTER, src, dst, d_port, proto) == -1)
71 return (-1);
72
73 pfr.rule.direction = dir;
74 if (ioctl(dev, DIOCADDRULE, &pfr) == -1)
75 return (-1);
76
77 return (0);
78}
79
80int
81add_nat(u_int32_t id, struct sockaddr *src, struct sockaddr *dst,
82 u_int16_t d_port, struct sockaddr *nat, u_int16_t nat_range_low,
83 u_int16_t nat_range_high, u_int8_t proto)
84{
85 if (!src || !dst || !d_port || !nat || !nat_range_low || !proto ||
86 (src->sa_family != nat->sa_family)) {
87 errno = EINVAL;
88 return (-1);
89 }
90
91 if (prepare_rule(id, PF_RULESET_NAT, src, dst, d_port, proto) == -1)
92 return (-1);
93
94 if (nat->sa_family == AF_INET) {
95 memcpy(&pfp.addr.addr.v.a.addr.v4,
96 &satosin(nat)->sin_addr.s_addr, 4);
97 memset(&pfp.addr.addr.v.a.mask.addr8, 255, 4);
98 } else {
99 memcpy(&pfp.addr.addr.v.a.addr.v6,
100 &satosin6(nat)->sin6_addr.s6_addr, 16);
101 memset(&pfp.addr.addr.v.a.mask.addr8, 255, 16);
102 }
103 if (ioctl(dev, DIOCADDADDR, &pfp) == -1)
104 return (-1);
105
106 pfr.rule.rpool.proxy_port[0] = nat_range_low;
107 pfr.rule.rpool.proxy_port[1] = nat_range_high;
108 if (ioctl(dev, DIOCADDRULE, &pfr) == -1)
109 return (-1);
110
111 return (0);
112}
113
114int
115add_rdr(u_int32_t id, struct sockaddr *src, struct sockaddr *dst,
116 u_int16_t d_port, struct sockaddr *rdr, u_int16_t rdr_port, u_int8_t proto)
117{
118 if (!src || !dst || !d_port || !rdr || !rdr_port || !proto ||
119 (src->sa_family != rdr->sa_family)) {
120 errno = EINVAL;
121 return (-1);
122 }
123
124 if (prepare_rule(id, PF_RULESET_RDR, src, dst, d_port, proto) == -1)
125 return (-1);
126
127 if (rdr->sa_family == AF_INET) {
128 memcpy(&pfp.addr.addr.v.a.addr.v4,
129 &satosin(rdr)->sin_addr.s_addr, 4);
130 memset(&pfp.addr.addr.v.a.mask.addr8, 255, 4);
131 } else {
132 memcpy(&pfp.addr.addr.v.a.addr.v6,
133 &satosin6(rdr)->sin6_addr.s6_addr, 16);
134 memset(&pfp.addr.addr.v.a.mask.addr8, 255, 16);
135 }
136 if (ioctl(dev, DIOCADDADDR, &pfp) == -1)
137 return (-1);
138
139 pfr.rule.rpool.proxy_port[0] = rdr_port;
140 if (ioctl(dev, DIOCADDRULE, &pfr) == -1)
141 return (-1);
142
143 return (0);
144}
145
146int
147do_commit(void)
148{
149 if (ioctl(dev, DIOCXCOMMIT, &pft) == -1)
150 return (-1);
151
152 return (0);
153}
154
155int
156do_rollback(void)
157{
158 if (ioctl(dev, DIOCXROLLBACK, &pft) == -1)
159 return (-1);
160
161 return (0);
162}
163
164void
165init_filter(char *opt_qname, int opt_verbose)
166{
167 struct pf_status status;
168
169 qname = opt_qname;
170
171 if (opt_verbose == 1)
172 rule_log = PF_LOG;
173 else if (opt_verbose == 2)
174 rule_log = PF_LOG_ALL;
175
176 dev = open("/dev/pf", O_RDWR);
177 if (dev == -1) {
178 syslog(LOG_ERR, "can't open /dev/pf");
179 exit(1);
180 }
181 if (ioctl(dev, DIOCGETSTATUS, &status) == -1) {
182 syslog(LOG_ERR, "DIOCGETSTATUS");
183 exit(1);
184 }
185 if (!status.running) {
186 syslog(LOG_ERR, "pf is disabled");
187 exit(1);
188 }
189}
190
191int
192prepare_commit(u_int32_t id)
193{
194 char an[PF_ANCHOR_NAME_SIZE];
195 int i;
196
197 memset(&pft, 0, sizeof pft);
198 pft.size = TRANS_SIZE;
199 pft.esize = sizeof pfte[0];
200 pft.array = pfte;
201
202 snprintf(an, PF_ANCHOR_NAME_SIZE, "%s/%d.%d", FTP_PROXY_ANCHOR,
203 getpid(), id);
204 for (i = 0; i < TRANS_SIZE; i++) {
205 memset(&pfte[i], 0, sizeof pfte[0]);
206 strlcpy(pfte[i].anchor, an, PF_ANCHOR_NAME_SIZE);
207 switch (i) {
208 case TRANS_FILTER:
209 pfte[i].rs_num = PF_RULESET_FILTER;
210 break;
211 case TRANS_NAT:
212 pfte[i].rs_num = PF_RULESET_NAT;
213 break;
214 case TRANS_RDR:
215 pfte[i].rs_num = PF_RULESET_RDR;
216 break;
217 default:
218 errno = EINVAL;
219 return (-1);
220 }
221 }
222
223 if (ioctl(dev, DIOCXBEGIN, &pft) == -1)
224 return (-1);
225
226 return (0);
227}
228
229int
230prepare_rule(u_int32_t id, int rs_num, struct sockaddr *src,
231 struct sockaddr *dst, u_int16_t d_port, u_int8_t proto)
232{
233 char an[PF_ANCHOR_NAME_SIZE];
234
235 if ((src->sa_family != AF_INET && src->sa_family != AF_INET6) ||
236 (src->sa_family != dst->sa_family)) {
237 errno = EPROTONOSUPPORT;
238 return (-1);
239 }
240
241 memset(&pfp, 0, sizeof pfp);
242 memset(&pfr, 0, sizeof pfr);
243 snprintf(an, PF_ANCHOR_NAME_SIZE, "%s/%d.%d", FTP_PROXY_ANCHOR,
244 getpid(), id);
245 strlcpy(pfp.anchor, an, PF_ANCHOR_NAME_SIZE);
246 strlcpy(pfr.anchor, an, PF_ANCHOR_NAME_SIZE);
247
248 switch (rs_num) {
249 case PF_RULESET_FILTER:
250 pfr.ticket = pfte[TRANS_FILTER].ticket;
251 break;
252 case PF_RULESET_NAT:
253 pfr.ticket = pfte[TRANS_NAT].ticket;
254 break;
255 case PF_RULESET_RDR:
256 pfr.ticket = pfte[TRANS_RDR].ticket;
257 break;
258 default:
259 errno = EINVAL;
260 return (-1);
261 }
262 if (ioctl(dev, DIOCBEGINADDRS, &pfp) == -1)
263 return (-1);
264 pfr.pool_ticket = pfp.ticket;
265
266 /* Generic for all rule types. */
267 pfr.rule.af = src->sa_family;
268 pfr.rule.proto = proto;
269 pfr.rule.src.addr.type = PF_ADDR_ADDRMASK;
270 pfr.rule.dst.addr.type = PF_ADDR_ADDRMASK;
271 if (src->sa_family == AF_INET) {
272 memcpy(&pfr.rule.src.addr.v.a.addr.v4,
273 &satosin(src)->sin_addr.s_addr, 4);
274 memset(&pfr.rule.src.addr.v.a.mask.addr8, 255, 4);
275 memcpy(&pfr.rule.dst.addr.v.a.addr.v4,
276 &satosin(dst)->sin_addr.s_addr, 4);
277 memset(&pfr.rule.dst.addr.v.a.mask.addr8, 255, 4);
278 } else {
279 memcpy(&pfr.rule.src.addr.v.a.addr.v6,
280 &satosin6(src)->sin6_addr.s6_addr, 16);
281 memset(&pfr.rule.src.addr.v.a.mask.addr8, 255, 16);
282 memcpy(&pfr.rule.dst.addr.v.a.addr.v6,
283 &satosin6(dst)->sin6_addr.s6_addr, 16);
284 memset(&pfr.rule.dst.addr.v.a.mask.addr8, 255, 16);
285 }
286 pfr.rule.dst.port_op = PF_OP_EQ;
287 pfr.rule.dst.port[0] = htons(d_port);
288
289 switch (rs_num) {
290 case PF_RULESET_FILTER:
291 /*
292 * pass quick [log] inet[6] proto tcp \
293 * from $src to $dst port = $d_port flags S/SAFR keep state
294 * (max 1) [queue qname]
295 */
296 pfr.rule.action = PF_PASS;
297 pfr.rule.quick = 1;
298 pfr.rule.log = rule_log;
299 pfr.rule.keep_state = 1;
300 pfr.rule.flags = (proto == IPPROTO_TCP ? TH_SYN : NULL);
301 pfr.rule.flagset = (proto == IPPROTO_TCP ?
302 (TH_SYN|TH_ACK|TH_FIN|TH_RST) : NULL);
303 pfr.rule.max_states = 1;
304 if (qname != NULL)
305 strlcpy(pfr.rule.qname, qname, sizeof pfr.rule.qname);
306 break;
307 case PF_RULESET_NAT:
308 /*
309 * nat inet[6] proto tcp from $src to $dst port $d_port -> $nat
310 */
311 pfr.rule.action = PF_NAT;
312 break;
313 case PF_RULESET_RDR:
314 /*
315 * rdr inet[6] proto tcp from $src to $dst port $d_port -> $rdr
316 */
317 pfr.rule.action = PF_RDR;
318 break;
319 default:
320 errno = EINVAL;
321 return (-1);
322 }
323
324 return (0);
325}
326
327int
328server_lookup(struct sockaddr *client, struct sockaddr *proxy,
329 struct sockaddr *server, u_int8_t proto)
330{
331 if (client->sa_family == AF_INET)
332 return (server_lookup4(satosin(client), satosin(proxy),
333 satosin(server), proto));
334
335 if (client->sa_family == AF_INET6)
336 return (server_lookup6(satosin6(client), satosin6(proxy),
337 satosin6(server), proto));
338
339 errno = EPROTONOSUPPORT;
340 return (-1);
341}
342
343int
344server_lookup4(struct sockaddr_in *client, struct sockaddr_in *proxy,
345 struct sockaddr_in *server, u_int8_t proto)
346{
347 struct pfioc_natlook pnl;
348
349 memset(&pnl, 0, sizeof pnl);
350 pnl.direction = PF_OUT;
351 pnl.af = AF_INET;
352 pnl.proto = proto;
353 memcpy(&pnl.saddr.v4, &client->sin_addr.s_addr, sizeof pnl.saddr.v4);
354 memcpy(&pnl.daddr.v4, &proxy->sin_addr.s_addr, sizeof pnl.daddr.v4);
355 pnl.sport = client->sin_port;
356 pnl.dport = proxy->sin_port;
357
358 if (ioctl(dev, DIOCNATLOOK, &pnl) == -1)
359 return (-1);
360
361 memset(server, 0, sizeof(struct sockaddr_in));
362 server->sin_len = sizeof(struct sockaddr_in);
363 server->sin_family = AF_INET;
364 memcpy(&server->sin_addr.s_addr, &pnl.rdaddr.v4,
365 sizeof server->sin_addr.s_addr);
366 server->sin_port = pnl.rdport;
367
368 return (0);
369}
370
371int
372server_lookup6(struct sockaddr_in6 *client, struct sockaddr_in6 *proxy,
373 struct sockaddr_in6 *server, u_int8_t proto)
374{
375 struct pfioc_natlook pnl;
376
377 memset(&pnl, 0, sizeof pnl);
378 pnl.direction = PF_OUT;
379 pnl.af = AF_INET6;
380 pnl.proto = proto;
381 memcpy(&pnl.saddr.v6, &client->sin6_addr.s6_addr, sizeof pnl.saddr.v6);
382 memcpy(&pnl.daddr.v6, &proxy->sin6_addr.s6_addr, sizeof pnl.daddr.v6);
383 pnl.sport = client->sin6_port;
384 pnl.dport = proxy->sin6_port;
385
386 if (ioctl(dev, DIOCNATLOOK, &pnl) == -1)
387 return (-1);
388
389 memset(server, 0, sizeof(struct sockaddr_in6));
390 server->sin6_len = sizeof(struct sockaddr_in6);
391 server->sin6_family = AF_INET6;
392 memcpy(&server->sin6_addr.s6_addr, &pnl.rdaddr.v6,
393 sizeof server->sin6_addr);
394 server->sin6_port = pnl.rdport;
395
396 return (0);
397}
2
3/*
4 * Copyright (c) 2004, 2005 Camiel Dobbelaar, <cd@sentia.nl>
5 *
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18
19#include <syslog.h>
20
21#include <sys/ioctl.h>
22#include <sys/types.h>
23#include <sys/socket.h>
24
25#include <net/if.h>
26#include <net/pfvar.h>
27#include <netinet/in.h>
28#include <netinet/tcp.h>
29#include <arpa/inet.h>
30
31#include <err.h>
32#include <errno.h>
33#include <fcntl.h>
34#include <stdio.h>
35#include <stdlib.h>
36#include <string.h>
37#include <unistd.h>
38
39#include "filter.h"
40
41/* From netinet/in.h, but only _KERNEL_ gets them. */
42#define satosin(sa) ((struct sockaddr_in *)(sa))
43#define satosin6(sa) ((struct sockaddr_in6 *)(sa))
44
45enum { TRANS_FILTER = 0, TRANS_NAT, TRANS_RDR, TRANS_SIZE };
46
47int prepare_rule(u_int32_t, int, struct sockaddr *, struct sockaddr *,
48 u_int16_t, u_int8_t);
49int server_lookup4(struct sockaddr_in *, struct sockaddr_in *,
50 struct sockaddr_in *, u_int8_t);
51int server_lookup6(struct sockaddr_in6 *, struct sockaddr_in6 *,
52 struct sockaddr_in6 *, u_int8_t);
53
54static struct pfioc_pooladdr pfp;
55static struct pfioc_rule pfr;
56static struct pfioc_trans pft;
57static struct pfioc_trans_e pfte[TRANS_SIZE];
58static int dev, rule_log;
59static char *qname;
60
61int
62add_filter(u_int32_t id, u_int8_t dir, struct sockaddr *src,
63 struct sockaddr *dst, u_int16_t d_port, u_int8_t proto)
64{
65 if (!src || !dst || !d_port || !proto) {
66 errno = EINVAL;
67 return (-1);
68 }
69
70 if (prepare_rule(id, PF_RULESET_FILTER, src, dst, d_port, proto) == -1)
71 return (-1);
72
73 pfr.rule.direction = dir;
74 if (ioctl(dev, DIOCADDRULE, &pfr) == -1)
75 return (-1);
76
77 return (0);
78}
79
80int
81add_nat(u_int32_t id, struct sockaddr *src, struct sockaddr *dst,
82 u_int16_t d_port, struct sockaddr *nat, u_int16_t nat_range_low,
83 u_int16_t nat_range_high, u_int8_t proto)
84{
85 if (!src || !dst || !d_port || !nat || !nat_range_low || !proto ||
86 (src->sa_family != nat->sa_family)) {
87 errno = EINVAL;
88 return (-1);
89 }
90
91 if (prepare_rule(id, PF_RULESET_NAT, src, dst, d_port, proto) == -1)
92 return (-1);
93
94 if (nat->sa_family == AF_INET) {
95 memcpy(&pfp.addr.addr.v.a.addr.v4,
96 &satosin(nat)->sin_addr.s_addr, 4);
97 memset(&pfp.addr.addr.v.a.mask.addr8, 255, 4);
98 } else {
99 memcpy(&pfp.addr.addr.v.a.addr.v6,
100 &satosin6(nat)->sin6_addr.s6_addr, 16);
101 memset(&pfp.addr.addr.v.a.mask.addr8, 255, 16);
102 }
103 if (ioctl(dev, DIOCADDADDR, &pfp) == -1)
104 return (-1);
105
106 pfr.rule.rpool.proxy_port[0] = nat_range_low;
107 pfr.rule.rpool.proxy_port[1] = nat_range_high;
108 if (ioctl(dev, DIOCADDRULE, &pfr) == -1)
109 return (-1);
110
111 return (0);
112}
113
114int
115add_rdr(u_int32_t id, struct sockaddr *src, struct sockaddr *dst,
116 u_int16_t d_port, struct sockaddr *rdr, u_int16_t rdr_port, u_int8_t proto)
117{
118 if (!src || !dst || !d_port || !rdr || !rdr_port || !proto ||
119 (src->sa_family != rdr->sa_family)) {
120 errno = EINVAL;
121 return (-1);
122 }
123
124 if (prepare_rule(id, PF_RULESET_RDR, src, dst, d_port, proto) == -1)
125 return (-1);
126
127 if (rdr->sa_family == AF_INET) {
128 memcpy(&pfp.addr.addr.v.a.addr.v4,
129 &satosin(rdr)->sin_addr.s_addr, 4);
130 memset(&pfp.addr.addr.v.a.mask.addr8, 255, 4);
131 } else {
132 memcpy(&pfp.addr.addr.v.a.addr.v6,
133 &satosin6(rdr)->sin6_addr.s6_addr, 16);
134 memset(&pfp.addr.addr.v.a.mask.addr8, 255, 16);
135 }
136 if (ioctl(dev, DIOCADDADDR, &pfp) == -1)
137 return (-1);
138
139 pfr.rule.rpool.proxy_port[0] = rdr_port;
140 if (ioctl(dev, DIOCADDRULE, &pfr) == -1)
141 return (-1);
142
143 return (0);
144}
145
146int
147do_commit(void)
148{
149 if (ioctl(dev, DIOCXCOMMIT, &pft) == -1)
150 return (-1);
151
152 return (0);
153}
154
155int
156do_rollback(void)
157{
158 if (ioctl(dev, DIOCXROLLBACK, &pft) == -1)
159 return (-1);
160
161 return (0);
162}
163
164void
165init_filter(char *opt_qname, int opt_verbose)
166{
167 struct pf_status status;
168
169 qname = opt_qname;
170
171 if (opt_verbose == 1)
172 rule_log = PF_LOG;
173 else if (opt_verbose == 2)
174 rule_log = PF_LOG_ALL;
175
176 dev = open("/dev/pf", O_RDWR);
177 if (dev == -1) {
178 syslog(LOG_ERR, "can't open /dev/pf");
179 exit(1);
180 }
181 if (ioctl(dev, DIOCGETSTATUS, &status) == -1) {
182 syslog(LOG_ERR, "DIOCGETSTATUS");
183 exit(1);
184 }
185 if (!status.running) {
186 syslog(LOG_ERR, "pf is disabled");
187 exit(1);
188 }
189}
190
191int
192prepare_commit(u_int32_t id)
193{
194 char an[PF_ANCHOR_NAME_SIZE];
195 int i;
196
197 memset(&pft, 0, sizeof pft);
198 pft.size = TRANS_SIZE;
199 pft.esize = sizeof pfte[0];
200 pft.array = pfte;
201
202 snprintf(an, PF_ANCHOR_NAME_SIZE, "%s/%d.%d", FTP_PROXY_ANCHOR,
203 getpid(), id);
204 for (i = 0; i < TRANS_SIZE; i++) {
205 memset(&pfte[i], 0, sizeof pfte[0]);
206 strlcpy(pfte[i].anchor, an, PF_ANCHOR_NAME_SIZE);
207 switch (i) {
208 case TRANS_FILTER:
209 pfte[i].rs_num = PF_RULESET_FILTER;
210 break;
211 case TRANS_NAT:
212 pfte[i].rs_num = PF_RULESET_NAT;
213 break;
214 case TRANS_RDR:
215 pfte[i].rs_num = PF_RULESET_RDR;
216 break;
217 default:
218 errno = EINVAL;
219 return (-1);
220 }
221 }
222
223 if (ioctl(dev, DIOCXBEGIN, &pft) == -1)
224 return (-1);
225
226 return (0);
227}
228
229int
230prepare_rule(u_int32_t id, int rs_num, struct sockaddr *src,
231 struct sockaddr *dst, u_int16_t d_port, u_int8_t proto)
232{
233 char an[PF_ANCHOR_NAME_SIZE];
234
235 if ((src->sa_family != AF_INET && src->sa_family != AF_INET6) ||
236 (src->sa_family != dst->sa_family)) {
237 errno = EPROTONOSUPPORT;
238 return (-1);
239 }
240
241 memset(&pfp, 0, sizeof pfp);
242 memset(&pfr, 0, sizeof pfr);
243 snprintf(an, PF_ANCHOR_NAME_SIZE, "%s/%d.%d", FTP_PROXY_ANCHOR,
244 getpid(), id);
245 strlcpy(pfp.anchor, an, PF_ANCHOR_NAME_SIZE);
246 strlcpy(pfr.anchor, an, PF_ANCHOR_NAME_SIZE);
247
248 switch (rs_num) {
249 case PF_RULESET_FILTER:
250 pfr.ticket = pfte[TRANS_FILTER].ticket;
251 break;
252 case PF_RULESET_NAT:
253 pfr.ticket = pfte[TRANS_NAT].ticket;
254 break;
255 case PF_RULESET_RDR:
256 pfr.ticket = pfte[TRANS_RDR].ticket;
257 break;
258 default:
259 errno = EINVAL;
260 return (-1);
261 }
262 if (ioctl(dev, DIOCBEGINADDRS, &pfp) == -1)
263 return (-1);
264 pfr.pool_ticket = pfp.ticket;
265
266 /* Generic for all rule types. */
267 pfr.rule.af = src->sa_family;
268 pfr.rule.proto = proto;
269 pfr.rule.src.addr.type = PF_ADDR_ADDRMASK;
270 pfr.rule.dst.addr.type = PF_ADDR_ADDRMASK;
271 if (src->sa_family == AF_INET) {
272 memcpy(&pfr.rule.src.addr.v.a.addr.v4,
273 &satosin(src)->sin_addr.s_addr, 4);
274 memset(&pfr.rule.src.addr.v.a.mask.addr8, 255, 4);
275 memcpy(&pfr.rule.dst.addr.v.a.addr.v4,
276 &satosin(dst)->sin_addr.s_addr, 4);
277 memset(&pfr.rule.dst.addr.v.a.mask.addr8, 255, 4);
278 } else {
279 memcpy(&pfr.rule.src.addr.v.a.addr.v6,
280 &satosin6(src)->sin6_addr.s6_addr, 16);
281 memset(&pfr.rule.src.addr.v.a.mask.addr8, 255, 16);
282 memcpy(&pfr.rule.dst.addr.v.a.addr.v6,
283 &satosin6(dst)->sin6_addr.s6_addr, 16);
284 memset(&pfr.rule.dst.addr.v.a.mask.addr8, 255, 16);
285 }
286 pfr.rule.dst.port_op = PF_OP_EQ;
287 pfr.rule.dst.port[0] = htons(d_port);
288
289 switch (rs_num) {
290 case PF_RULESET_FILTER:
291 /*
292 * pass quick [log] inet[6] proto tcp \
293 * from $src to $dst port = $d_port flags S/SAFR keep state
294 * (max 1) [queue qname]
295 */
296 pfr.rule.action = PF_PASS;
297 pfr.rule.quick = 1;
298 pfr.rule.log = rule_log;
299 pfr.rule.keep_state = 1;
300 pfr.rule.flags = (proto == IPPROTO_TCP ? TH_SYN : NULL);
301 pfr.rule.flagset = (proto == IPPROTO_TCP ?
302 (TH_SYN|TH_ACK|TH_FIN|TH_RST) : NULL);
303 pfr.rule.max_states = 1;
304 if (qname != NULL)
305 strlcpy(pfr.rule.qname, qname, sizeof pfr.rule.qname);
306 break;
307 case PF_RULESET_NAT:
308 /*
309 * nat inet[6] proto tcp from $src to $dst port $d_port -> $nat
310 */
311 pfr.rule.action = PF_NAT;
312 break;
313 case PF_RULESET_RDR:
314 /*
315 * rdr inet[6] proto tcp from $src to $dst port $d_port -> $rdr
316 */
317 pfr.rule.action = PF_RDR;
318 break;
319 default:
320 errno = EINVAL;
321 return (-1);
322 }
323
324 return (0);
325}
326
327int
328server_lookup(struct sockaddr *client, struct sockaddr *proxy,
329 struct sockaddr *server, u_int8_t proto)
330{
331 if (client->sa_family == AF_INET)
332 return (server_lookup4(satosin(client), satosin(proxy),
333 satosin(server), proto));
334
335 if (client->sa_family == AF_INET6)
336 return (server_lookup6(satosin6(client), satosin6(proxy),
337 satosin6(server), proto));
338
339 errno = EPROTONOSUPPORT;
340 return (-1);
341}
342
343int
344server_lookup4(struct sockaddr_in *client, struct sockaddr_in *proxy,
345 struct sockaddr_in *server, u_int8_t proto)
346{
347 struct pfioc_natlook pnl;
348
349 memset(&pnl, 0, sizeof pnl);
350 pnl.direction = PF_OUT;
351 pnl.af = AF_INET;
352 pnl.proto = proto;
353 memcpy(&pnl.saddr.v4, &client->sin_addr.s_addr, sizeof pnl.saddr.v4);
354 memcpy(&pnl.daddr.v4, &proxy->sin_addr.s_addr, sizeof pnl.daddr.v4);
355 pnl.sport = client->sin_port;
356 pnl.dport = proxy->sin_port;
357
358 if (ioctl(dev, DIOCNATLOOK, &pnl) == -1)
359 return (-1);
360
361 memset(server, 0, sizeof(struct sockaddr_in));
362 server->sin_len = sizeof(struct sockaddr_in);
363 server->sin_family = AF_INET;
364 memcpy(&server->sin_addr.s_addr, &pnl.rdaddr.v4,
365 sizeof server->sin_addr.s_addr);
366 server->sin_port = pnl.rdport;
367
368 return (0);
369}
370
371int
372server_lookup6(struct sockaddr_in6 *client, struct sockaddr_in6 *proxy,
373 struct sockaddr_in6 *server, u_int8_t proto)
374{
375 struct pfioc_natlook pnl;
376
377 memset(&pnl, 0, sizeof pnl);
378 pnl.direction = PF_OUT;
379 pnl.af = AF_INET6;
380 pnl.proto = proto;
381 memcpy(&pnl.saddr.v6, &client->sin6_addr.s6_addr, sizeof pnl.saddr.v6);
382 memcpy(&pnl.daddr.v6, &proxy->sin6_addr.s6_addr, sizeof pnl.daddr.v6);
383 pnl.sport = client->sin6_port;
384 pnl.dport = proxy->sin6_port;
385
386 if (ioctl(dev, DIOCNATLOOK, &pnl) == -1)
387 return (-1);
388
389 memset(server, 0, sizeof(struct sockaddr_in6));
390 server->sin6_len = sizeof(struct sockaddr_in6);
391 server->sin6_family = AF_INET6;
392 memcpy(&server->sin6_addr.s6_addr, &pnl.rdaddr.v6,
393 sizeof server->sin6_addr);
394 server->sin6_port = pnl.rdport;
395
396 return (0);
397}