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54326190 JK |
1 | /* Copyright (C) 2003-2011 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu> |
2 | * | |
3 | * This program is free software; you can redistribute it and/or modify | |
4 | * it under the terms of the GNU General Public License version 2 as | |
5 | * published by the Free Software Foundation. | |
6 | */ | |
7 | ||
8 | /* Kernel module implementing an IP set type: the bitmap:port type */ | |
9 | ||
10 | #include <linux/module.h> | |
11 | #include <linux/ip.h> | |
54326190 JK |
12 | #include <linux/skbuff.h> |
13 | #include <linux/errno.h> | |
54326190 JK |
14 | #include <linux/netlink.h> |
15 | #include <linux/jiffies.h> | |
16 | #include <linux/timer.h> | |
17 | #include <net/netlink.h> | |
18 | ||
19 | #include <linux/netfilter/ipset/ip_set.h> | |
20 | #include <linux/netfilter/ipset/ip_set_bitmap.h> | |
21 | #include <linux/netfilter/ipset/ip_set_getport.h> | |
22 | #define IP_SET_BITMAP_TIMEOUT | |
23 | #include <linux/netfilter/ipset/ip_set_timeout.h> | |
24 | ||
25 | MODULE_LICENSE("GPL"); | |
26 | MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>"); | |
27 | MODULE_DESCRIPTION("bitmap:port type of IP sets"); | |
28 | MODULE_ALIAS("ip_set_bitmap:port"); | |
29 | ||
30 | /* Type structure */ | |
31 | struct bitmap_port { | |
32 | void *members; /* the set members */ | |
33 | u16 first_port; /* host byte order, included in range */ | |
34 | u16 last_port; /* host byte order, included in range */ | |
35 | size_t memsize; /* members size */ | |
36 | u32 timeout; /* timeout parameter */ | |
37 | struct timer_list gc; /* garbage collection */ | |
38 | }; | |
39 | ||
40 | /* Base variant */ | |
41 | ||
42 | static int | |
5416219e | 43 | bitmap_port_test(struct ip_set *set, void *value, u32 timeout, u32 flags) |
54326190 JK |
44 | { |
45 | const struct bitmap_port *map = set->data; | |
46 | u16 id = *(u16 *)value; | |
47 | ||
48 | return !!test_bit(id, map->members); | |
49 | } | |
50 | ||
51 | static int | |
5416219e | 52 | bitmap_port_add(struct ip_set *set, void *value, u32 timeout, u32 flags) |
54326190 JK |
53 | { |
54 | struct bitmap_port *map = set->data; | |
55 | u16 id = *(u16 *)value; | |
56 | ||
57 | if (test_and_set_bit(id, map->members)) | |
58 | return -IPSET_ERR_EXIST; | |
59 | ||
60 | return 0; | |
61 | } | |
62 | ||
63 | static int | |
5416219e | 64 | bitmap_port_del(struct ip_set *set, void *value, u32 timeout, u32 flags) |
54326190 JK |
65 | { |
66 | struct bitmap_port *map = set->data; | |
67 | u16 id = *(u16 *)value; | |
68 | ||
69 | if (!test_and_clear_bit(id, map->members)) | |
70 | return -IPSET_ERR_EXIST; | |
71 | ||
72 | return 0; | |
73 | } | |
74 | ||
75 | static int | |
76 | bitmap_port_list(const struct ip_set *set, | |
77 | struct sk_buff *skb, struct netlink_callback *cb) | |
78 | { | |
79 | const struct bitmap_port *map = set->data; | |
80 | struct nlattr *atd, *nested; | |
81 | u16 id, first = cb->args[2]; | |
82 | u16 last = map->last_port - map->first_port; | |
83 | ||
84 | atd = ipset_nest_start(skb, IPSET_ATTR_ADT); | |
85 | if (!atd) | |
86 | return -EMSGSIZE; | |
87 | for (; cb->args[2] <= last; cb->args[2]++) { | |
88 | id = cb->args[2]; | |
89 | if (!test_bit(id, map->members)) | |
90 | continue; | |
91 | nested = ipset_nest_start(skb, IPSET_ATTR_DATA); | |
92 | if (!nested) { | |
93 | if (id == first) { | |
94 | nla_nest_cancel(skb, atd); | |
95 | return -EMSGSIZE; | |
96 | } else | |
97 | goto nla_put_failure; | |
98 | } | |
99 | NLA_PUT_NET16(skb, IPSET_ATTR_PORT, | |
100 | htons(map->first_port + id)); | |
101 | ipset_nest_end(skb, nested); | |
102 | } | |
103 | ipset_nest_end(skb, atd); | |
104 | /* Set listing finished */ | |
105 | cb->args[2] = 0; | |
106 | ||
107 | return 0; | |
108 | ||
109 | nla_put_failure: | |
110 | nla_nest_cancel(skb, nested); | |
111 | ipset_nest_end(skb, atd); | |
112 | if (unlikely(id == first)) { | |
113 | cb->args[2] = 0; | |
114 | return -EMSGSIZE; | |
115 | } | |
116 | return 0; | |
117 | } | |
118 | ||
119 | /* Timeout variant */ | |
120 | ||
121 | static int | |
5416219e | 122 | bitmap_port_ttest(struct ip_set *set, void *value, u32 timeout, u32 flags) |
54326190 JK |
123 | { |
124 | const struct bitmap_port *map = set->data; | |
125 | const unsigned long *members = map->members; | |
126 | u16 id = *(u16 *)value; | |
127 | ||
128 | return ip_set_timeout_test(members[id]); | |
129 | } | |
130 | ||
131 | static int | |
5416219e | 132 | bitmap_port_tadd(struct ip_set *set, void *value, u32 timeout, u32 flags) |
54326190 JK |
133 | { |
134 | struct bitmap_port *map = set->data; | |
135 | unsigned long *members = map->members; | |
136 | u16 id = *(u16 *)value; | |
137 | ||
5416219e | 138 | if (ip_set_timeout_test(members[id]) && !(flags & IPSET_FLAG_EXIST)) |
54326190 JK |
139 | return -IPSET_ERR_EXIST; |
140 | ||
141 | members[id] = ip_set_timeout_set(timeout); | |
142 | ||
143 | return 0; | |
144 | } | |
145 | ||
146 | static int | |
5416219e | 147 | bitmap_port_tdel(struct ip_set *set, void *value, u32 timeout, u32 flags) |
54326190 JK |
148 | { |
149 | struct bitmap_port *map = set->data; | |
150 | unsigned long *members = map->members; | |
151 | u16 id = *(u16 *)value; | |
152 | int ret = -IPSET_ERR_EXIST; | |
153 | ||
154 | if (ip_set_timeout_test(members[id])) | |
155 | ret = 0; | |
156 | ||
157 | members[id] = IPSET_ELEM_UNSET; | |
158 | return ret; | |
159 | } | |
160 | ||
161 | static int | |
162 | bitmap_port_tlist(const struct ip_set *set, | |
163 | struct sk_buff *skb, struct netlink_callback *cb) | |
164 | { | |
165 | const struct bitmap_port *map = set->data; | |
166 | struct nlattr *adt, *nested; | |
167 | u16 id, first = cb->args[2]; | |
168 | u16 last = map->last_port - map->first_port; | |
169 | const unsigned long *members = map->members; | |
170 | ||
171 | adt = ipset_nest_start(skb, IPSET_ATTR_ADT); | |
172 | if (!adt) | |
173 | return -EMSGSIZE; | |
174 | for (; cb->args[2] <= last; cb->args[2]++) { | |
175 | id = cb->args[2]; | |
176 | if (!ip_set_timeout_test(members[id])) | |
177 | continue; | |
178 | nested = ipset_nest_start(skb, IPSET_ATTR_DATA); | |
179 | if (!nested) { | |
180 | if (id == first) { | |
181 | nla_nest_cancel(skb, adt); | |
182 | return -EMSGSIZE; | |
183 | } else | |
184 | goto nla_put_failure; | |
185 | } | |
186 | NLA_PUT_NET16(skb, IPSET_ATTR_PORT, | |
187 | htons(map->first_port + id)); | |
188 | NLA_PUT_NET32(skb, IPSET_ATTR_TIMEOUT, | |
189 | htonl(ip_set_timeout_get(members[id]))); | |
190 | ipset_nest_end(skb, nested); | |
191 | } | |
192 | ipset_nest_end(skb, adt); | |
193 | ||
194 | /* Set listing finished */ | |
195 | cb->args[2] = 0; | |
196 | ||
197 | return 0; | |
198 | ||
199 | nla_put_failure: | |
200 | nla_nest_cancel(skb, nested); | |
201 | ipset_nest_end(skb, adt); | |
202 | if (unlikely(id == first)) { | |
203 | cb->args[2] = 0; | |
204 | return -EMSGSIZE; | |
205 | } | |
206 | return 0; | |
207 | } | |
208 | ||
209 | static int | |
210 | bitmap_port_kadt(struct ip_set *set, const struct sk_buff *skb, | |
ac8cc925 | 211 | enum ipset_adt adt, const struct ip_set_adt_opt *opt) |
54326190 JK |
212 | { |
213 | struct bitmap_port *map = set->data; | |
214 | ipset_adtfn adtfn = set->variant->adt[adt]; | |
215 | __be16 __port; | |
216 | u16 port = 0; | |
217 | ||
ac8cc925 JK |
218 | if (!ip_set_get_ip_port(skb, opt->family, |
219 | opt->flags & IPSET_DIM_ONE_SRC, &__port)) | |
54326190 JK |
220 | return -EINVAL; |
221 | ||
222 | port = ntohs(__port); | |
223 | ||
224 | if (port < map->first_port || port > map->last_port) | |
225 | return -IPSET_ERR_BITMAP_RANGE; | |
226 | ||
227 | port -= map->first_port; | |
228 | ||
ac8cc925 | 229 | return adtfn(set, &port, opt_timeout(opt, map), opt->cmdflags); |
54326190 JK |
230 | } |
231 | ||
232 | static int | |
233 | bitmap_port_uadt(struct ip_set *set, struct nlattr *tb[], | |
234 | enum ipset_adt adt, u32 *lineno, u32 flags) | |
235 | { | |
236 | struct bitmap_port *map = set->data; | |
237 | ipset_adtfn adtfn = set->variant->adt[adt]; | |
238 | u32 timeout = map->timeout; | |
239 | u32 port; /* wraparound */ | |
240 | u16 id, port_to; | |
241 | int ret = 0; | |
242 | ||
243 | if (unlikely(!ip_set_attr_netorder(tb, IPSET_ATTR_PORT) || | |
244 | !ip_set_optattr_netorder(tb, IPSET_ATTR_PORT_TO) || | |
245 | !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT))) | |
246 | return -IPSET_ERR_PROTOCOL; | |
247 | ||
248 | if (tb[IPSET_ATTR_LINENO]) | |
249 | *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]); | |
250 | ||
251 | port = ip_set_get_h16(tb[IPSET_ATTR_PORT]); | |
252 | if (port < map->first_port || port > map->last_port) | |
253 | return -IPSET_ERR_BITMAP_RANGE; | |
254 | ||
255 | if (tb[IPSET_ATTR_TIMEOUT]) { | |
256 | if (!with_timeout(map->timeout)) | |
257 | return -IPSET_ERR_TIMEOUT; | |
258 | timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]); | |
259 | } | |
260 | ||
261 | if (adt == IPSET_TEST) { | |
262 | id = port - map->first_port; | |
5416219e | 263 | return adtfn(set, &id, timeout, flags); |
54326190 JK |
264 | } |
265 | ||
266 | if (tb[IPSET_ATTR_PORT_TO]) { | |
267 | port_to = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]); | |
268 | if (port > port_to) { | |
269 | swap(port, port_to); | |
270 | if (port < map->first_port) | |
271 | return -IPSET_ERR_BITMAP_RANGE; | |
272 | } | |
273 | } else | |
274 | port_to = port; | |
275 | ||
276 | if (port_to > map->last_port) | |
277 | return -IPSET_ERR_BITMAP_RANGE; | |
278 | ||
279 | for (; port <= port_to; port++) { | |
280 | id = port - map->first_port; | |
5416219e | 281 | ret = adtfn(set, &id, timeout, flags); |
54326190 JK |
282 | |
283 | if (ret && !ip_set_eexist(ret, flags)) | |
284 | return ret; | |
285 | else | |
286 | ret = 0; | |
287 | } | |
288 | return ret; | |
289 | } | |
290 | ||
291 | static void | |
292 | bitmap_port_destroy(struct ip_set *set) | |
293 | { | |
294 | struct bitmap_port *map = set->data; | |
295 | ||
296 | if (with_timeout(map->timeout)) | |
297 | del_timer_sync(&map->gc); | |
298 | ||
299 | ip_set_free(map->members); | |
300 | kfree(map); | |
301 | ||
302 | set->data = NULL; | |
303 | } | |
304 | ||
305 | static void | |
306 | bitmap_port_flush(struct ip_set *set) | |
307 | { | |
308 | struct bitmap_port *map = set->data; | |
309 | ||
310 | memset(map->members, 0, map->memsize); | |
311 | } | |
312 | ||
313 | static int | |
314 | bitmap_port_head(struct ip_set *set, struct sk_buff *skb) | |
315 | { | |
316 | const struct bitmap_port *map = set->data; | |
317 | struct nlattr *nested; | |
318 | ||
319 | nested = ipset_nest_start(skb, IPSET_ATTR_DATA); | |
320 | if (!nested) | |
321 | goto nla_put_failure; | |
322 | NLA_PUT_NET16(skb, IPSET_ATTR_PORT, htons(map->first_port)); | |
323 | NLA_PUT_NET16(skb, IPSET_ATTR_PORT_TO, htons(map->last_port)); | |
2f9f28b2 | 324 | NLA_PUT_NET32(skb, IPSET_ATTR_REFERENCES, htonl(set->ref - 1)); |
54326190 JK |
325 | NLA_PUT_NET32(skb, IPSET_ATTR_MEMSIZE, |
326 | htonl(sizeof(*map) + map->memsize)); | |
327 | if (with_timeout(map->timeout)) | |
328 | NLA_PUT_NET32(skb, IPSET_ATTR_TIMEOUT, htonl(map->timeout)); | |
329 | ipset_nest_end(skb, nested); | |
330 | ||
331 | return 0; | |
332 | nla_put_failure: | |
333 | return -EMSGSIZE; | |
334 | } | |
335 | ||
336 | static bool | |
337 | bitmap_port_same_set(const struct ip_set *a, const struct ip_set *b) | |
338 | { | |
339 | const struct bitmap_port *x = a->data; | |
340 | const struct bitmap_port *y = b->data; | |
341 | ||
342 | return x->first_port == y->first_port && | |
343 | x->last_port == y->last_port && | |
344 | x->timeout == y->timeout; | |
345 | } | |
346 | ||
347 | static const struct ip_set_type_variant bitmap_port = { | |
348 | .kadt = bitmap_port_kadt, | |
349 | .uadt = bitmap_port_uadt, | |
350 | .adt = { | |
351 | [IPSET_ADD] = bitmap_port_add, | |
352 | [IPSET_DEL] = bitmap_port_del, | |
353 | [IPSET_TEST] = bitmap_port_test, | |
354 | }, | |
355 | .destroy = bitmap_port_destroy, | |
356 | .flush = bitmap_port_flush, | |
357 | .head = bitmap_port_head, | |
358 | .list = bitmap_port_list, | |
359 | .same_set = bitmap_port_same_set, | |
360 | }; | |
361 | ||
362 | static const struct ip_set_type_variant bitmap_tport = { | |
363 | .kadt = bitmap_port_kadt, | |
364 | .uadt = bitmap_port_uadt, | |
365 | .adt = { | |
366 | [IPSET_ADD] = bitmap_port_tadd, | |
367 | [IPSET_DEL] = bitmap_port_tdel, | |
368 | [IPSET_TEST] = bitmap_port_ttest, | |
369 | }, | |
370 | .destroy = bitmap_port_destroy, | |
371 | .flush = bitmap_port_flush, | |
372 | .head = bitmap_port_head, | |
373 | .list = bitmap_port_tlist, | |
374 | .same_set = bitmap_port_same_set, | |
375 | }; | |
376 | ||
377 | static void | |
378 | bitmap_port_gc(unsigned long ul_set) | |
379 | { | |
380 | struct ip_set *set = (struct ip_set *) ul_set; | |
381 | struct bitmap_port *map = set->data; | |
382 | unsigned long *table = map->members; | |
383 | u32 id; /* wraparound */ | |
384 | u16 last = map->last_port - map->first_port; | |
385 | ||
386 | /* We run parallel with other readers (test element) | |
387 | * but adding/deleting new entries is locked out */ | |
388 | read_lock_bh(&set->lock); | |
389 | for (id = 0; id <= last; id++) | |
390 | if (ip_set_timeout_expired(table[id])) | |
391 | table[id] = IPSET_ELEM_UNSET; | |
392 | read_unlock_bh(&set->lock); | |
393 | ||
394 | map->gc.expires = jiffies + IPSET_GC_PERIOD(map->timeout) * HZ; | |
395 | add_timer(&map->gc); | |
396 | } | |
397 | ||
398 | static void | |
399 | bitmap_port_gc_init(struct ip_set *set) | |
400 | { | |
401 | struct bitmap_port *map = set->data; | |
402 | ||
403 | init_timer(&map->gc); | |
404 | map->gc.data = (unsigned long) set; | |
405 | map->gc.function = bitmap_port_gc; | |
406 | map->gc.expires = jiffies + IPSET_GC_PERIOD(map->timeout) * HZ; | |
407 | add_timer(&map->gc); | |
408 | } | |
409 | ||
410 | /* Create bitmap:ip type of sets */ | |
411 | ||
412 | static bool | |
413 | init_map_port(struct ip_set *set, struct bitmap_port *map, | |
414 | u16 first_port, u16 last_port) | |
415 | { | |
416 | map->members = ip_set_alloc(map->memsize); | |
417 | if (!map->members) | |
418 | return false; | |
419 | map->first_port = first_port; | |
420 | map->last_port = last_port; | |
421 | map->timeout = IPSET_NO_TIMEOUT; | |
422 | ||
423 | set->data = map; | |
424 | set->family = AF_UNSPEC; | |
425 | ||
426 | return true; | |
427 | } | |
428 | ||
429 | static int | |
430 | bitmap_port_create(struct ip_set *set, struct nlattr *tb[], | |
431 | u32 flags) | |
432 | { | |
433 | struct bitmap_port *map; | |
434 | u16 first_port, last_port; | |
435 | ||
436 | if (unlikely(!ip_set_attr_netorder(tb, IPSET_ATTR_PORT) || | |
437 | !ip_set_attr_netorder(tb, IPSET_ATTR_PORT_TO) || | |
438 | !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT))) | |
439 | return -IPSET_ERR_PROTOCOL; | |
440 | ||
441 | first_port = ip_set_get_h16(tb[IPSET_ATTR_PORT]); | |
442 | last_port = ip_set_get_h16(tb[IPSET_ATTR_PORT_TO]); | |
443 | if (first_port > last_port) { | |
444 | u16 tmp = first_port; | |
445 | ||
446 | first_port = last_port; | |
447 | last_port = tmp; | |
448 | } | |
449 | ||
450 | map = kzalloc(sizeof(*map), GFP_KERNEL); | |
451 | if (!map) | |
452 | return -ENOMEM; | |
453 | ||
454 | if (tb[IPSET_ATTR_TIMEOUT]) { | |
455 | map->memsize = (last_port - first_port + 1) | |
456 | * sizeof(unsigned long); | |
457 | ||
458 | if (!init_map_port(set, map, first_port, last_port)) { | |
459 | kfree(map); | |
460 | return -ENOMEM; | |
461 | } | |
462 | ||
463 | map->timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]); | |
464 | set->variant = &bitmap_tport; | |
465 | ||
466 | bitmap_port_gc_init(set); | |
467 | } else { | |
468 | map->memsize = bitmap_bytes(0, last_port - first_port); | |
469 | pr_debug("memsize: %zu\n", map->memsize); | |
470 | if (!init_map_port(set, map, first_port, last_port)) { | |
471 | kfree(map); | |
472 | return -ENOMEM; | |
473 | } | |
474 | ||
475 | set->variant = &bitmap_port; | |
476 | } | |
477 | return 0; | |
478 | } | |
479 | ||
480 | static struct ip_set_type bitmap_port_type = { | |
481 | .name = "bitmap:port", | |
482 | .protocol = IPSET_PROTOCOL, | |
483 | .features = IPSET_TYPE_PORT, | |
484 | .dimension = IPSET_DIM_ONE, | |
485 | .family = AF_UNSPEC, | |
486 | .revision = 0, | |
487 | .create = bitmap_port_create, | |
488 | .create_policy = { | |
489 | [IPSET_ATTR_PORT] = { .type = NLA_U16 }, | |
490 | [IPSET_ATTR_PORT_TO] = { .type = NLA_U16 }, | |
491 | [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 }, | |
492 | }, | |
493 | .adt_policy = { | |
494 | [IPSET_ATTR_PORT] = { .type = NLA_U16 }, | |
495 | [IPSET_ATTR_PORT_TO] = { .type = NLA_U16 }, | |
496 | [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 }, | |
497 | [IPSET_ATTR_LINENO] = { .type = NLA_U32 }, | |
498 | }, | |
499 | .me = THIS_MODULE, | |
500 | }; | |
501 | ||
502 | static int __init | |
503 | bitmap_port_init(void) | |
504 | { | |
505 | return ip_set_type_register(&bitmap_port_type); | |
506 | } | |
507 | ||
508 | static void __exit | |
509 | bitmap_port_fini(void) | |
510 | { | |
511 | ip_set_type_unregister(&bitmap_port_type); | |
512 | } | |
513 | ||
514 | module_init(bitmap_port_init); | |
515 | module_exit(bitmap_port_fini); |