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f830837f JK |
1 | /* Copyright (C) 2008-2011 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 list:set type */ | |
9 | ||
10 | #include <linux/module.h> | |
11 | #include <linux/ip.h> | |
12 | #include <linux/skbuff.h> | |
13 | #include <linux/errno.h> | |
14 | ||
15 | #include <linux/netfilter/ipset/ip_set.h> | |
16 | #include <linux/netfilter/ipset/ip_set_timeout.h> | |
17 | #include <linux/netfilter/ipset/ip_set_list.h> | |
18 | ||
19 | MODULE_LICENSE("GPL"); | |
20 | MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>"); | |
21 | MODULE_DESCRIPTION("list:set type of IP sets"); | |
22 | MODULE_ALIAS("ip_set_list:set"); | |
23 | ||
24 | /* Member elements without and with timeout */ | |
25 | struct set_elem { | |
26 | ip_set_id_t id; | |
27 | }; | |
28 | ||
29 | struct set_telem { | |
30 | ip_set_id_t id; | |
31 | unsigned long timeout; | |
32 | }; | |
33 | ||
34 | /* Type structure */ | |
35 | struct list_set { | |
36 | size_t dsize; /* element size */ | |
37 | u32 size; /* size of set list array */ | |
38 | u32 timeout; /* timeout value */ | |
39 | struct timer_list gc; /* garbage collection */ | |
40 | struct set_elem members[0]; /* the set members */ | |
41 | }; | |
42 | ||
43 | static inline struct set_elem * | |
44 | list_set_elem(const struct list_set *map, u32 id) | |
45 | { | |
46 | return (struct set_elem *)((char *)map->members + id * map->dsize); | |
47 | } | |
48 | ||
49 | static inline bool | |
50 | list_set_timeout(const struct list_set *map, u32 id) | |
51 | { | |
52 | const struct set_telem *elem = | |
53 | (const struct set_telem *) list_set_elem(map, id); | |
54 | ||
55 | return ip_set_timeout_test(elem->timeout); | |
56 | } | |
57 | ||
58 | static inline bool | |
59 | list_set_expired(const struct list_set *map, u32 id) | |
60 | { | |
61 | const struct set_telem *elem = | |
62 | (const struct set_telem *) list_set_elem(map, id); | |
63 | ||
64 | return ip_set_timeout_expired(elem->timeout); | |
65 | } | |
66 | ||
67 | static inline int | |
68 | list_set_exist(const struct set_telem *elem) | |
69 | { | |
70 | return elem->id != IPSET_INVALID_ID && | |
71 | !ip_set_timeout_expired(elem->timeout); | |
72 | } | |
73 | ||
74 | /* Set list without and with timeout */ | |
75 | ||
76 | static int | |
77 | list_set_kadt(struct ip_set *set, const struct sk_buff *skb, | |
78 | enum ipset_adt adt, u8 pf, u8 dim, u8 flags) | |
79 | { | |
80 | struct list_set *map = set->data; | |
81 | struct set_elem *elem; | |
82 | u32 i; | |
83 | int ret; | |
84 | ||
85 | for (i = 0; i < map->size; i++) { | |
86 | elem = list_set_elem(map, i); | |
87 | if (elem->id == IPSET_INVALID_ID) | |
88 | return 0; | |
89 | if (with_timeout(map->timeout) && list_set_expired(map, i)) | |
90 | continue; | |
91 | switch (adt) { | |
92 | case IPSET_TEST: | |
93 | ret = ip_set_test(elem->id, skb, pf, dim, flags); | |
94 | if (ret > 0) | |
95 | return ret; | |
96 | break; | |
97 | case IPSET_ADD: | |
98 | ret = ip_set_add(elem->id, skb, pf, dim, flags); | |
99 | if (ret == 0) | |
100 | return ret; | |
101 | break; | |
102 | case IPSET_DEL: | |
103 | ret = ip_set_del(elem->id, skb, pf, dim, flags); | |
104 | if (ret == 0) | |
105 | return ret; | |
106 | break; | |
107 | default: | |
108 | break; | |
109 | } | |
110 | } | |
111 | return -EINVAL; | |
112 | } | |
113 | ||
114 | static bool | |
115 | next_id_eq(const struct list_set *map, u32 i, ip_set_id_t id) | |
116 | { | |
117 | const struct set_elem *elem; | |
118 | ||
119 | if (i + 1 < map->size) { | |
120 | elem = list_set_elem(map, i + 1); | |
121 | return !!(elem->id == id && | |
122 | !(with_timeout(map->timeout) && | |
123 | list_set_expired(map, i + 1))); | |
124 | } | |
125 | ||
126 | return 0; | |
127 | } | |
128 | ||
129 | static void | |
130 | list_elem_add(struct list_set *map, u32 i, ip_set_id_t id) | |
131 | { | |
132 | struct set_elem *e; | |
133 | ||
134 | for (; i < map->size; i++) { | |
135 | e = list_set_elem(map, i); | |
136 | swap(e->id, id); | |
137 | if (e->id == IPSET_INVALID_ID) | |
138 | break; | |
139 | } | |
140 | } | |
141 | ||
142 | static void | |
143 | list_elem_tadd(struct list_set *map, u32 i, ip_set_id_t id, | |
144 | unsigned long timeout) | |
145 | { | |
146 | struct set_telem *e; | |
147 | ||
148 | for (; i < map->size; i++) { | |
149 | e = (struct set_telem *)list_set_elem(map, i); | |
150 | swap(e->id, id); | |
151 | if (e->id == IPSET_INVALID_ID) | |
152 | break; | |
153 | swap(e->timeout, timeout); | |
154 | } | |
155 | } | |
156 | ||
157 | static int | |
158 | list_set_add(struct list_set *map, u32 i, ip_set_id_t id, | |
159 | unsigned long timeout) | |
160 | { | |
161 | const struct set_elem *e = list_set_elem(map, i); | |
162 | ||
163 | if (i == map->size - 1 && e->id != IPSET_INVALID_ID) | |
164 | /* Last element replaced: e.g. add new,before,last */ | |
165 | ip_set_put_byindex(e->id); | |
166 | if (with_timeout(map->timeout)) | |
167 | list_elem_tadd(map, i, id, timeout); | |
168 | else | |
169 | list_elem_add(map, i, id); | |
170 | ||
171 | return 0; | |
172 | } | |
173 | ||
174 | static int | |
175 | list_set_del(struct list_set *map, ip_set_id_t id, u32 i) | |
176 | { | |
177 | struct set_elem *a = list_set_elem(map, i), *b; | |
178 | ||
179 | ip_set_put_byindex(id); | |
180 | ||
181 | for (; i < map->size - 1; i++) { | |
182 | b = list_set_elem(map, i + 1); | |
183 | a->id = b->id; | |
184 | if (with_timeout(map->timeout)) | |
185 | ((struct set_telem *)a)->timeout = | |
186 | ((struct set_telem *)b)->timeout; | |
187 | a = b; | |
188 | if (a->id == IPSET_INVALID_ID) | |
189 | break; | |
190 | } | |
191 | /* Last element */ | |
192 | a->id = IPSET_INVALID_ID; | |
193 | return 0; | |
194 | } | |
195 | ||
196 | static int | |
197 | list_set_uadt(struct ip_set *set, struct nlattr *tb[], | |
198 | enum ipset_adt adt, u32 *lineno, u32 flags) | |
199 | { | |
200 | struct list_set *map = set->data; | |
201 | bool with_timeout = with_timeout(map->timeout); | |
202 | int before = 0; | |
203 | u32 timeout = map->timeout; | |
204 | ip_set_id_t id, refid = IPSET_INVALID_ID; | |
205 | const struct set_elem *elem; | |
206 | struct ip_set *s; | |
207 | u32 i; | |
208 | int ret = 0; | |
209 | ||
210 | if (unlikely(!tb[IPSET_ATTR_NAME] || | |
211 | !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) || | |
212 | !ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS))) | |
213 | return -IPSET_ERR_PROTOCOL; | |
214 | ||
215 | if (tb[IPSET_ATTR_LINENO]) | |
216 | *lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]); | |
217 | ||
218 | id = ip_set_get_byname(nla_data(tb[IPSET_ATTR_NAME]), &s); | |
219 | if (id == IPSET_INVALID_ID) | |
220 | return -IPSET_ERR_NAME; | |
221 | /* "Loop detection" */ | |
222 | if (s->type->features & IPSET_TYPE_NAME) { | |
223 | ret = -IPSET_ERR_LOOP; | |
224 | goto finish; | |
225 | } | |
226 | ||
227 | if (tb[IPSET_ATTR_CADT_FLAGS]) { | |
228 | u32 f = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]); | |
229 | before = f & IPSET_FLAG_BEFORE; | |
230 | } | |
231 | ||
232 | if (before && !tb[IPSET_ATTR_NAMEREF]) { | |
233 | ret = -IPSET_ERR_BEFORE; | |
234 | goto finish; | |
235 | } | |
236 | ||
237 | if (tb[IPSET_ATTR_NAMEREF]) { | |
238 | refid = ip_set_get_byname(nla_data(tb[IPSET_ATTR_NAMEREF]), | |
239 | &s); | |
240 | if (refid == IPSET_INVALID_ID) { | |
241 | ret = -IPSET_ERR_NAMEREF; | |
242 | goto finish; | |
243 | } | |
244 | if (!before) | |
245 | before = -1; | |
246 | } | |
247 | if (tb[IPSET_ATTR_TIMEOUT]) { | |
248 | if (!with_timeout) { | |
249 | ret = -IPSET_ERR_TIMEOUT; | |
250 | goto finish; | |
251 | } | |
252 | timeout = ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]); | |
253 | } | |
254 | ||
255 | switch (adt) { | |
256 | case IPSET_TEST: | |
257 | for (i = 0; i < map->size && !ret; i++) { | |
258 | elem = list_set_elem(map, i); | |
259 | if (elem->id == IPSET_INVALID_ID || | |
260 | (before != 0 && i + 1 >= map->size)) | |
261 | break; | |
262 | else if (with_timeout && list_set_expired(map, i)) | |
263 | continue; | |
264 | else if (before > 0 && elem->id == id) | |
265 | ret = next_id_eq(map, i, refid); | |
266 | else if (before < 0 && elem->id == refid) | |
267 | ret = next_id_eq(map, i, id); | |
268 | else if (before == 0 && elem->id == id) | |
269 | ret = 1; | |
270 | } | |
271 | break; | |
272 | case IPSET_ADD: | |
273 | for (i = 0; i < map->size && !ret; i++) { | |
274 | elem = list_set_elem(map, i); | |
275 | if (elem->id == id && | |
276 | !(with_timeout && list_set_expired(map, i))) | |
277 | ret = -IPSET_ERR_EXIST; | |
278 | } | |
279 | if (ret == -IPSET_ERR_EXIST) | |
280 | break; | |
281 | ret = -IPSET_ERR_LIST_FULL; | |
282 | for (i = 0; i < map->size && ret == -IPSET_ERR_LIST_FULL; i++) { | |
283 | elem = list_set_elem(map, i); | |
284 | if (elem->id == IPSET_INVALID_ID) | |
285 | ret = before != 0 ? -IPSET_ERR_REF_EXIST | |
286 | : list_set_add(map, i, id, timeout); | |
287 | else if (elem->id != refid) | |
288 | continue; | |
289 | else if (with_timeout && list_set_expired(map, i)) | |
290 | ret = -IPSET_ERR_REF_EXIST; | |
291 | else if (before) | |
292 | ret = list_set_add(map, i, id, timeout); | |
293 | else if (i + 1 < map->size) | |
294 | ret = list_set_add(map, i + 1, id, timeout); | |
295 | } | |
296 | break; | |
297 | case IPSET_DEL: | |
298 | ret = -IPSET_ERR_EXIST; | |
299 | for (i = 0; i < map->size && ret == -IPSET_ERR_EXIST; i++) { | |
300 | elem = list_set_elem(map, i); | |
301 | if (elem->id == IPSET_INVALID_ID) { | |
302 | ret = before != 0 ? -IPSET_ERR_REF_EXIST | |
303 | : -IPSET_ERR_EXIST; | |
304 | break; | |
305 | } else if (with_timeout && list_set_expired(map, i)) | |
306 | continue; | |
307 | else if (elem->id == id && | |
308 | (before == 0 || | |
309 | (before > 0 && | |
310 | next_id_eq(map, i, refid)))) | |
311 | ret = list_set_del(map, id, i); | |
312 | else if (before < 0 && | |
313 | elem->id == refid && | |
314 | next_id_eq(map, i, id)) | |
315 | ret = list_set_del(map, id, i + 1); | |
316 | } | |
317 | break; | |
318 | default: | |
319 | break; | |
320 | } | |
321 | ||
322 | finish: | |
323 | if (refid != IPSET_INVALID_ID) | |
324 | ip_set_put_byindex(refid); | |
325 | if (adt != IPSET_ADD || ret) | |
326 | ip_set_put_byindex(id); | |
327 | ||
328 | return ip_set_eexist(ret, flags) ? 0 : ret; | |
329 | } | |
330 | ||
331 | static void | |
332 | list_set_flush(struct ip_set *set) | |
333 | { | |
334 | struct list_set *map = set->data; | |
335 | struct set_elem *elem; | |
336 | u32 i; | |
337 | ||
338 | for (i = 0; i < map->size; i++) { | |
339 | elem = list_set_elem(map, i); | |
340 | if (elem->id != IPSET_INVALID_ID) { | |
341 | ip_set_put_byindex(elem->id); | |
342 | elem->id = IPSET_INVALID_ID; | |
343 | } | |
344 | } | |
345 | } | |
346 | ||
347 | static void | |
348 | list_set_destroy(struct ip_set *set) | |
349 | { | |
350 | struct list_set *map = set->data; | |
351 | ||
352 | if (with_timeout(map->timeout)) | |
353 | del_timer_sync(&map->gc); | |
354 | list_set_flush(set); | |
355 | kfree(map); | |
356 | ||
357 | set->data = NULL; | |
358 | } | |
359 | ||
360 | static int | |
361 | list_set_head(struct ip_set *set, struct sk_buff *skb) | |
362 | { | |
363 | const struct list_set *map = set->data; | |
364 | struct nlattr *nested; | |
365 | ||
366 | nested = ipset_nest_start(skb, IPSET_ATTR_DATA); | |
367 | if (!nested) | |
368 | goto nla_put_failure; | |
369 | NLA_PUT_NET32(skb, IPSET_ATTR_SIZE, htonl(map->size)); | |
370 | if (with_timeout(map->timeout)) | |
371 | NLA_PUT_NET32(skb, IPSET_ATTR_TIMEOUT, htonl(map->timeout)); | |
372 | NLA_PUT_NET32(skb, IPSET_ATTR_REFERENCES, | |
373 | htonl(atomic_read(&set->ref) - 1)); | |
374 | NLA_PUT_NET32(skb, IPSET_ATTR_MEMSIZE, | |
375 | htonl(sizeof(*map) + map->size * map->dsize)); | |
376 | ipset_nest_end(skb, nested); | |
377 | ||
378 | return 0; | |
379 | nla_put_failure: | |
380 | return -EMSGSIZE; | |
381 | } | |
382 | ||
383 | static int | |
384 | list_set_list(const struct ip_set *set, | |
385 | struct sk_buff *skb, struct netlink_callback *cb) | |
386 | { | |
387 | const struct list_set *map = set->data; | |
388 | struct nlattr *atd, *nested; | |
389 | u32 i, first = cb->args[2]; | |
390 | const struct set_elem *e; | |
391 | ||
392 | atd = ipset_nest_start(skb, IPSET_ATTR_ADT); | |
393 | if (!atd) | |
394 | return -EMSGSIZE; | |
395 | for (; cb->args[2] < map->size; cb->args[2]++) { | |
396 | i = cb->args[2]; | |
397 | e = list_set_elem(map, i); | |
398 | if (e->id == IPSET_INVALID_ID) | |
399 | goto finish; | |
400 | if (with_timeout(map->timeout) && list_set_expired(map, i)) | |
401 | continue; | |
402 | nested = ipset_nest_start(skb, IPSET_ATTR_DATA); | |
403 | if (!nested) { | |
404 | if (i == first) { | |
405 | nla_nest_cancel(skb, atd); | |
406 | return -EMSGSIZE; | |
407 | } else | |
408 | goto nla_put_failure; | |
409 | } | |
410 | NLA_PUT_STRING(skb, IPSET_ATTR_NAME, | |
411 | ip_set_name_byindex(e->id)); | |
412 | if (with_timeout(map->timeout)) { | |
413 | const struct set_telem *te = | |
414 | (const struct set_telem *) e; | |
415 | NLA_PUT_NET32(skb, IPSET_ATTR_TIMEOUT, | |
416 | htonl(ip_set_timeout_get(te->timeout))); | |
417 | } | |
418 | ipset_nest_end(skb, nested); | |
419 | } | |
420 | finish: | |
421 | ipset_nest_end(skb, atd); | |
422 | /* Set listing finished */ | |
423 | cb->args[2] = 0; | |
424 | return 0; | |
425 | ||
426 | nla_put_failure: | |
427 | nla_nest_cancel(skb, nested); | |
428 | ipset_nest_end(skb, atd); | |
429 | if (unlikely(i == first)) { | |
430 | cb->args[2] = 0; | |
431 | return -EMSGSIZE; | |
432 | } | |
433 | return 0; | |
434 | } | |
435 | ||
436 | static bool | |
437 | list_set_same_set(const struct ip_set *a, const struct ip_set *b) | |
438 | { | |
439 | const struct list_set *x = a->data; | |
440 | const struct list_set *y = b->data; | |
441 | ||
442 | return x->size == y->size && | |
443 | x->timeout == y->timeout; | |
444 | } | |
445 | ||
446 | static const struct ip_set_type_variant list_set = { | |
447 | .kadt = list_set_kadt, | |
448 | .uadt = list_set_uadt, | |
449 | .destroy = list_set_destroy, | |
450 | .flush = list_set_flush, | |
451 | .head = list_set_head, | |
452 | .list = list_set_list, | |
453 | .same_set = list_set_same_set, | |
454 | }; | |
455 | ||
456 | static void | |
457 | list_set_gc(unsigned long ul_set) | |
458 | { | |
459 | struct ip_set *set = (struct ip_set *) ul_set; | |
460 | struct list_set *map = set->data; | |
461 | struct set_telem *e; | |
462 | u32 i; | |
463 | ||
464 | /* We run parallel with other readers (test element) | |
465 | * but adding/deleting new entries is locked out */ | |
466 | read_lock_bh(&set->lock); | |
467 | for (i = map->size - 1; i >= 0; i--) { | |
468 | e = (struct set_telem *) list_set_elem(map, i); | |
469 | if (e->id != IPSET_INVALID_ID && | |
470 | list_set_expired(map, i)) | |
471 | list_set_del(map, e->id, i); | |
472 | } | |
473 | read_unlock_bh(&set->lock); | |
474 | ||
475 | map->gc.expires = jiffies + IPSET_GC_PERIOD(map->timeout) * HZ; | |
476 | add_timer(&map->gc); | |
477 | } | |
478 | ||
479 | static void | |
480 | list_set_gc_init(struct ip_set *set) | |
481 | { | |
482 | struct list_set *map = set->data; | |
483 | ||
484 | init_timer(&map->gc); | |
485 | map->gc.data = (unsigned long) set; | |
486 | map->gc.function = list_set_gc; | |
487 | map->gc.expires = jiffies + IPSET_GC_PERIOD(map->timeout) * HZ; | |
488 | add_timer(&map->gc); | |
489 | } | |
490 | ||
491 | /* Create list:set type of sets */ | |
492 | ||
493 | static bool | |
494 | init_list_set(struct ip_set *set, u32 size, size_t dsize, | |
495 | unsigned long timeout) | |
496 | { | |
497 | struct list_set *map; | |
498 | struct set_elem *e; | |
499 | u32 i; | |
500 | ||
501 | map = kzalloc(sizeof(*map) + size * dsize, GFP_KERNEL); | |
502 | if (!map) | |
503 | return false; | |
504 | ||
505 | map->size = size; | |
506 | map->dsize = dsize; | |
507 | map->timeout = timeout; | |
508 | set->data = map; | |
509 | ||
510 | for (i = 0; i < size; i++) { | |
511 | e = list_set_elem(map, i); | |
512 | e->id = IPSET_INVALID_ID; | |
513 | } | |
514 | ||
515 | return true; | |
516 | } | |
517 | ||
518 | static int | |
519 | list_set_create(struct ip_set *set, struct nlattr *tb[], u32 flags) | |
520 | { | |
521 | u32 size = IP_SET_LIST_DEFAULT_SIZE; | |
522 | ||
523 | if (unlikely(!ip_set_optattr_netorder(tb, IPSET_ATTR_SIZE) || | |
524 | !ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT))) | |
525 | return -IPSET_ERR_PROTOCOL; | |
526 | ||
527 | if (tb[IPSET_ATTR_SIZE]) | |
528 | size = ip_set_get_h32(tb[IPSET_ATTR_SIZE]); | |
529 | if (size < IP_SET_LIST_MIN_SIZE) | |
530 | size = IP_SET_LIST_MIN_SIZE; | |
531 | ||
532 | if (tb[IPSET_ATTR_TIMEOUT]) { | |
533 | if (!init_list_set(set, size, sizeof(struct set_telem), | |
534 | ip_set_timeout_uget(tb[IPSET_ATTR_TIMEOUT]))) | |
535 | return -ENOMEM; | |
536 | ||
537 | list_set_gc_init(set); | |
538 | } else { | |
539 | if (!init_list_set(set, size, sizeof(struct set_elem), | |
540 | IPSET_NO_TIMEOUT)) | |
541 | return -ENOMEM; | |
542 | } | |
543 | set->variant = &list_set; | |
544 | return 0; | |
545 | } | |
546 | ||
547 | static struct ip_set_type list_set_type __read_mostly = { | |
548 | .name = "list:set", | |
549 | .protocol = IPSET_PROTOCOL, | |
550 | .features = IPSET_TYPE_NAME | IPSET_DUMP_LAST, | |
551 | .dimension = IPSET_DIM_ONE, | |
552 | .family = AF_UNSPEC, | |
553 | .revision = 0, | |
554 | .create = list_set_create, | |
555 | .create_policy = { | |
556 | [IPSET_ATTR_SIZE] = { .type = NLA_U32 }, | |
557 | [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 }, | |
558 | }, | |
559 | .adt_policy = { | |
560 | [IPSET_ATTR_NAME] = { .type = NLA_STRING, | |
561 | .len = IPSET_MAXNAMELEN }, | |
562 | [IPSET_ATTR_NAMEREF] = { .type = NLA_STRING, | |
563 | .len = IPSET_MAXNAMELEN }, | |
564 | [IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 }, | |
565 | [IPSET_ATTR_LINENO] = { .type = NLA_U32 }, | |
566 | [IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 }, | |
567 | }, | |
568 | .me = THIS_MODULE, | |
569 | }; | |
570 | ||
571 | static int __init | |
572 | list_set_init(void) | |
573 | { | |
574 | return ip_set_type_register(&list_set_type); | |
575 | } | |
576 | ||
577 | static void __exit | |
578 | list_set_fini(void) | |
579 | { | |
580 | ip_set_type_unregister(&list_set_type); | |
581 | } | |
582 | ||
583 | module_init(list_set_init); | |
584 | module_exit(list_set_fini); |