libnftnl 1.2.6
set_elem.c
1/*
2 * (C) 2012-2013 by Pablo Neira Ayuso <pablo@netfilter.org>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published
6 * by the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This code has been sponsored by Sophos Astaro <http://www.sophos.com>
10 */
11#include "internal.h"
12
13#include <time.h>
14#include <endian.h>
15#include <stdint.h>
16#include <stdlib.h>
17#include <string.h>
18#include <netinet/in.h>
19#include <errno.h>
20#include <ctype.h>
21
22#include <libmnl/libmnl.h>
23#include <linux/netfilter/nfnetlink.h>
24#include <linux/netfilter/nf_tables.h>
25
26#include <libnftnl/set.h>
27#include <libnftnl/rule.h>
28#include <libnftnl/expr.h>
29
30EXPORT_SYMBOL(nftnl_set_elem_alloc);
31struct nftnl_set_elem *nftnl_set_elem_alloc(void)
32{
33 struct nftnl_set_elem *s;
34
35 s = calloc(1, sizeof(struct nftnl_set_elem));
36 if (s == NULL)
37 return NULL;
38
39 INIT_LIST_HEAD(&s->expr_list);
40
41 return s;
42}
43
44EXPORT_SYMBOL(nftnl_set_elem_free);
45void nftnl_set_elem_free(struct nftnl_set_elem *s)
46{
47 struct nftnl_expr *e, *tmp;
48
49 if (s->flags & (1 << NFTNL_SET_ELEM_CHAIN))
50 xfree(s->data.chain);
51
52 list_for_each_entry_safe(e, tmp, &s->expr_list, head)
53 nftnl_expr_free(e);
54
55 if (s->flags & (1 << NFTNL_SET_ELEM_USERDATA))
56 xfree(s->user.data);
57
58 if (s->flags & (1 << NFTNL_SET_ELEM_OBJREF))
59 xfree(s->objref);
60
61 xfree(s);
62}
63
64EXPORT_SYMBOL(nftnl_set_elem_is_set);
65bool nftnl_set_elem_is_set(const struct nftnl_set_elem *s, uint16_t attr)
66{
67 return s->flags & (1 << attr);
68}
69
70EXPORT_SYMBOL(nftnl_set_elem_unset);
71void nftnl_set_elem_unset(struct nftnl_set_elem *s, uint16_t attr)
72{
73 struct nftnl_expr *expr, *tmp;
74
75 if (!(s->flags & (1 << attr)))
76 return;
77
78 switch (attr) {
79 case NFTNL_SET_ELEM_CHAIN:
80 xfree(s->data.chain);
81 break;
82 case NFTNL_SET_ELEM_FLAGS:
83 case NFTNL_SET_ELEM_KEY: /* NFTA_SET_ELEM_KEY */
84 case NFTNL_SET_ELEM_KEY_END: /* NFTA_SET_ELEM_KEY_END */
85 case NFTNL_SET_ELEM_VERDICT: /* NFTA_SET_ELEM_DATA */
86 case NFTNL_SET_ELEM_DATA: /* NFTA_SET_ELEM_DATA */
87 case NFTNL_SET_ELEM_TIMEOUT: /* NFTA_SET_ELEM_TIMEOUT */
88 case NFTNL_SET_ELEM_EXPIRATION: /* NFTA_SET_ELEM_EXPIRATION */
89 break;
90 case NFTNL_SET_ELEM_USERDATA: /* NFTA_SET_ELEM_USERDATA */
91 xfree(s->user.data);
92 break;
93 case NFTNL_SET_ELEM_EXPR:
94 case NFTNL_SET_ELEM_EXPRESSIONS:
95 list_for_each_entry_safe(expr, tmp, &s->expr_list, head)
96 nftnl_expr_free(expr);
97 break;
98 case NFTNL_SET_ELEM_OBJREF:
99 xfree(s->objref);
100 break;
101 default:
102 return;
103 }
104
105 s->flags &= ~(1 << attr);
106}
107
108static uint32_t nftnl_set_elem_validate[NFTNL_SET_ELEM_MAX + 1] = {
109 [NFTNL_SET_ELEM_FLAGS] = sizeof(uint32_t),
110 [NFTNL_SET_ELEM_VERDICT] = sizeof(uint32_t),
111 [NFTNL_SET_ELEM_TIMEOUT] = sizeof(uint64_t),
112 [NFTNL_SET_ELEM_EXPIRATION] = sizeof(uint64_t),
113};
114
115EXPORT_SYMBOL(nftnl_set_elem_set);
116int nftnl_set_elem_set(struct nftnl_set_elem *s, uint16_t attr,
117 const void *data, uint32_t data_len)
118{
119 struct nftnl_expr *expr, *tmp;
120
121 nftnl_assert_attr_exists(attr, NFTNL_SET_ELEM_MAX);
122 nftnl_assert_validate(data, nftnl_set_elem_validate, attr, data_len);
123
124 switch(attr) {
125 case NFTNL_SET_ELEM_FLAGS:
126 memcpy(&s->set_elem_flags, data, sizeof(s->set_elem_flags));
127 break;
128 case NFTNL_SET_ELEM_KEY: /* NFTA_SET_ELEM_KEY */
129 memcpy(&s->key.val, data, data_len);
130 s->key.len = data_len;
131 break;
132 case NFTNL_SET_ELEM_KEY_END: /* NFTA_SET_ELEM_KEY_END */
133 memcpy(&s->key_end.val, data, data_len);
134 s->key_end.len = data_len;
135 break;
136 case NFTNL_SET_ELEM_VERDICT: /* NFTA_SET_ELEM_DATA */
137 memcpy(&s->data.verdict, data, sizeof(s->data.verdict));
138 break;
139 case NFTNL_SET_ELEM_CHAIN: /* NFTA_SET_ELEM_DATA */
140 if (s->flags & (1 << NFTNL_SET_ELEM_CHAIN))
141 xfree(s->data.chain);
142
143 s->data.chain = strdup(data);
144 if (!s->data.chain)
145 return -1;
146 break;
147 case NFTNL_SET_ELEM_DATA: /* NFTA_SET_ELEM_DATA */
148 memcpy(s->data.val, data, data_len);
149 s->data.len = data_len;
150 break;
151 case NFTNL_SET_ELEM_TIMEOUT: /* NFTA_SET_ELEM_TIMEOUT */
152 memcpy(&s->timeout, data, sizeof(s->timeout));
153 break;
154 case NFTNL_SET_ELEM_EXPIRATION: /* NFTA_SET_ELEM_EXPIRATION */
155 memcpy(&s->expiration, data, sizeof(s->expiration));
156 break;
157 case NFTNL_SET_ELEM_USERDATA: /* NFTA_SET_ELEM_USERDATA */
158 if (s->flags & (1 << NFTNL_SET_ELEM_USERDATA))
159 xfree(s->user.data);
160
161 s->user.data = malloc(data_len);
162 if (!s->user.data)
163 return -1;
164 memcpy(s->user.data, data, data_len);
165 s->user.len = data_len;
166 break;
167 case NFTNL_SET_ELEM_OBJREF:
168 if (s->flags & (1 << NFTNL_SET_ELEM_OBJREF))
169 xfree(s->objref);
170
171 s->objref = strdup(data);
172 if (!s->objref)
173 return -1;
174 break;
175 case NFTNL_SET_ELEM_EXPR:
176 list_for_each_entry_safe(expr, tmp, &s->expr_list, head)
177 nftnl_expr_free(expr);
178
179 expr = (void *)data;
180 list_add(&expr->head, &s->expr_list);
181 break;
182 }
183 s->flags |= (1 << attr);
184 return 0;
185}
186
187EXPORT_SYMBOL(nftnl_set_elem_set_u32);
188void nftnl_set_elem_set_u32(struct nftnl_set_elem *s, uint16_t attr, uint32_t val)
189{
190 nftnl_set_elem_set(s, attr, &val, sizeof(uint32_t));
191}
192
193EXPORT_SYMBOL(nftnl_set_elem_set_u64);
194void nftnl_set_elem_set_u64(struct nftnl_set_elem *s, uint16_t attr, uint64_t val)
195{
196 nftnl_set_elem_set(s, attr, &val, sizeof(uint64_t));
197}
198
199EXPORT_SYMBOL(nftnl_set_elem_set_str);
200int nftnl_set_elem_set_str(struct nftnl_set_elem *s, uint16_t attr, const char *str)
201{
202 return nftnl_set_elem_set(s, attr, str, strlen(str) + 1);
203}
204
205EXPORT_SYMBOL(nftnl_set_elem_get);
206const void *nftnl_set_elem_get(struct nftnl_set_elem *s, uint16_t attr, uint32_t *data_len)
207{
208 struct nftnl_expr *expr;
209
210 if (!(s->flags & (1 << attr)))
211 return NULL;
212
213 switch(attr) {
214 case NFTNL_SET_ELEM_FLAGS:
215 *data_len = sizeof(s->set_elem_flags);
216 return &s->set_elem_flags;
217 case NFTNL_SET_ELEM_KEY: /* NFTA_SET_ELEM_KEY */
218 *data_len = s->key.len;
219 return &s->key.val;
220 case NFTNL_SET_ELEM_KEY_END: /* NFTA_SET_ELEM_KEY_END */
221 *data_len = s->key_end.len;
222 return &s->key_end.val;
223 case NFTNL_SET_ELEM_VERDICT: /* NFTA_SET_ELEM_DATA */
224 *data_len = sizeof(s->data.verdict);
225 return &s->data.verdict;
226 case NFTNL_SET_ELEM_CHAIN: /* NFTA_SET_ELEM_DATA */
227 *data_len = strlen(s->data.chain) + 1;
228 return s->data.chain;
229 case NFTNL_SET_ELEM_DATA: /* NFTA_SET_ELEM_DATA */
230 *data_len = s->data.len;
231 return &s->data.val;
232 case NFTNL_SET_ELEM_TIMEOUT: /* NFTA_SET_ELEM_TIMEOUT */
233 *data_len = sizeof(s->timeout);
234 return &s->timeout;
235 case NFTNL_SET_ELEM_EXPIRATION: /* NFTA_SET_ELEM_EXPIRATION */
236 *data_len = sizeof(s->expiration);
237 return &s->expiration;
238 case NFTNL_SET_ELEM_USERDATA:
239 *data_len = s->user.len;
240 return s->user.data;
241 case NFTNL_SET_ELEM_EXPR:
242 list_for_each_entry(expr, &s->expr_list, head)
243 break;
244 return expr;
245 case NFTNL_SET_ELEM_OBJREF:
246 *data_len = strlen(s->objref) + 1;
247 return s->objref;
248 }
249 return NULL;
250}
251
252EXPORT_SYMBOL(nftnl_set_elem_get_str);
253const char *nftnl_set_elem_get_str(struct nftnl_set_elem *s, uint16_t attr)
254{
255 uint32_t size;
256
257 return nftnl_set_elem_get(s, attr, &size);
258}
259
260EXPORT_SYMBOL(nftnl_set_elem_get_u32);
261uint32_t nftnl_set_elem_get_u32(struct nftnl_set_elem *s, uint16_t attr)
262{
263 uint32_t size, val;
264
265 memcpy(&val, nftnl_set_elem_get(s, attr, &size), sizeof(val));
266
267 return val;
268}
269
270EXPORT_SYMBOL(nftnl_set_elem_get_u64);
271uint64_t nftnl_set_elem_get_u64(struct nftnl_set_elem *s, uint16_t attr)
272{
273 uint32_t size;
274 uint64_t val;
275
276 memcpy(&val, nftnl_set_elem_get(s, attr, &size), sizeof(val));
277
278 return val;
279}
280
281struct nftnl_set_elem *nftnl_set_elem_clone(struct nftnl_set_elem *elem)
282{
283 struct nftnl_set_elem *newelem;
284
285 newelem = nftnl_set_elem_alloc();
286 if (newelem == NULL)
287 return NULL;
288
289 memcpy(newelem, elem, sizeof(*elem));
290
291 if (elem->flags & (1 << NFTNL_SET_ELEM_CHAIN)) {
292 newelem->data.chain = strdup(elem->data.chain);
293 if (!newelem->data.chain)
294 goto err;
295 }
296
297 return newelem;
298err:
299 nftnl_set_elem_free(newelem);
300 return NULL;
301}
302
303EXPORT_SYMBOL(nftnl_set_elem_nlmsg_build_payload);
304void nftnl_set_elem_nlmsg_build_payload(struct nlmsghdr *nlh,
305 struct nftnl_set_elem *e)
306{
307 struct nftnl_expr *expr;
308 int num_exprs = 0;
309
310 if (e->flags & (1 << NFTNL_SET_ELEM_FLAGS))
311 mnl_attr_put_u32(nlh, NFTA_SET_ELEM_FLAGS, htonl(e->set_elem_flags));
312 if (e->flags & (1 << NFTNL_SET_ELEM_TIMEOUT))
313 mnl_attr_put_u64(nlh, NFTA_SET_ELEM_TIMEOUT, htobe64(e->timeout));
314 if (e->flags & (1 << NFTNL_SET_ELEM_EXPIRATION))
315 mnl_attr_put_u64(nlh, NFTA_SET_ELEM_EXPIRATION, htobe64(e->expiration));
316 if (e->flags & (1 << NFTNL_SET_ELEM_KEY)) {
317 struct nlattr *nest1;
318
319 nest1 = mnl_attr_nest_start(nlh, NFTA_SET_ELEM_KEY);
320 mnl_attr_put(nlh, NFTA_DATA_VALUE, e->key.len, e->key.val);
321 mnl_attr_nest_end(nlh, nest1);
322 }
323 if (e->flags & (1 << NFTNL_SET_ELEM_KEY_END)) {
324 struct nlattr *nest1;
325
326 nest1 = mnl_attr_nest_start(nlh, NFTA_SET_ELEM_KEY_END);
327 mnl_attr_put(nlh, NFTA_DATA_VALUE, e->key_end.len,
328 e->key_end.val);
329 mnl_attr_nest_end(nlh, nest1);
330 }
331 if (e->flags & (1 << NFTNL_SET_ELEM_VERDICT)) {
332 struct nlattr *nest1, *nest2;
333
334 nest1 = mnl_attr_nest_start(nlh, NFTA_SET_ELEM_DATA);
335 nest2 = mnl_attr_nest_start(nlh, NFTA_DATA_VERDICT);
336 mnl_attr_put_u32(nlh, NFTA_VERDICT_CODE, htonl(e->data.verdict));
337 if (e->flags & (1 << NFTNL_SET_ELEM_CHAIN))
338 mnl_attr_put_strz(nlh, NFTA_VERDICT_CHAIN, e->data.chain);
339
340 mnl_attr_nest_end(nlh, nest1);
341 mnl_attr_nest_end(nlh, nest2);
342 }
343 if (e->flags & (1 << NFTNL_SET_ELEM_DATA)) {
344 struct nlattr *nest1;
345
346 nest1 = mnl_attr_nest_start(nlh, NFTA_SET_ELEM_DATA);
347 mnl_attr_put(nlh, NFTA_DATA_VALUE, e->data.len, e->data.val);
348 mnl_attr_nest_end(nlh, nest1);
349 }
350 if (e->flags & (1 << NFTNL_SET_ELEM_USERDATA))
351 mnl_attr_put(nlh, NFTA_SET_ELEM_USERDATA, e->user.len, e->user.data);
352 if (e->flags & (1 << NFTNL_SET_ELEM_OBJREF))
353 mnl_attr_put_strz(nlh, NFTA_SET_ELEM_OBJREF, e->objref);
354
355 if (!list_empty(&e->expr_list)) {
356 list_for_each_entry(expr, &e->expr_list, head)
357 num_exprs++;
358
359 if (num_exprs == 1) {
360 struct nlattr *nest1;
361
362 nest1 = mnl_attr_nest_start(nlh, NFTA_SET_ELEM_EXPR);
363 list_for_each_entry(expr, &e->expr_list, head)
364 nftnl_expr_build_payload(nlh, expr);
365
366 mnl_attr_nest_end(nlh, nest1);
367 } else if (num_exprs > 1) {
368 struct nlattr *nest1, *nest2;
369
370 nest1 = mnl_attr_nest_start(nlh, NFTA_SET_ELEM_EXPRESSIONS);
371 list_for_each_entry(expr, &e->expr_list, head) {
372 nest2 = mnl_attr_nest_start(nlh, NFTA_LIST_ELEM);
373 nftnl_expr_build_payload(nlh, expr);
374 mnl_attr_nest_end(nlh, nest2);
375 }
376 mnl_attr_nest_end(nlh, nest1);
377 }
378 }
379}
380
381static void nftnl_set_elem_nlmsg_build_def(struct nlmsghdr *nlh,
382 const struct nftnl_set *s)
383{
384 if (s->flags & (1 << NFTNL_SET_NAME))
385 mnl_attr_put_strz(nlh, NFTA_SET_ELEM_LIST_SET, s->name);
386 if (s->flags & (1 << NFTNL_SET_ID))
387 mnl_attr_put_u32(nlh, NFTA_SET_ELEM_LIST_SET_ID, htonl(s->id));
388 if (s->flags & (1 << NFTNL_SET_TABLE))
389 mnl_attr_put_strz(nlh, NFTA_SET_ELEM_LIST_TABLE, s->table);
390}
391
392EXPORT_SYMBOL(nftnl_set_elem_nlmsg_build);
393struct nlattr *nftnl_set_elem_nlmsg_build(struct nlmsghdr *nlh,
394 struct nftnl_set_elem *elem, int i)
395{
396 struct nlattr *nest2;
397
398 nest2 = mnl_attr_nest_start(nlh, i);
399 nftnl_set_elem_nlmsg_build_payload(nlh, elem);
400 mnl_attr_nest_end(nlh, nest2);
401
402 return nest2;
403}
404
405EXPORT_SYMBOL(nftnl_set_elems_nlmsg_build_payload);
406void nftnl_set_elems_nlmsg_build_payload(struct nlmsghdr *nlh, struct nftnl_set *s)
407{
408 struct nftnl_set_elem *elem;
409 struct nlattr *nest1;
410 int i = 0;
411
412 nftnl_set_elem_nlmsg_build_def(nlh, s);
413
414 if (list_empty(&s->element_list))
415 return;
416
417 nest1 = mnl_attr_nest_start(nlh, NFTA_SET_ELEM_LIST_ELEMENTS);
418 list_for_each_entry(elem, &s->element_list, head)
419 nftnl_set_elem_nlmsg_build(nlh, elem, ++i);
420
421 mnl_attr_nest_end(nlh, nest1);
422}
423
424EXPORT_SYMBOL(nftnl_set_elem_add_expr);
425void nftnl_set_elem_add_expr(struct nftnl_set_elem *e, struct nftnl_expr *expr)
426{
427 list_add_tail(&expr->head, &e->expr_list);
428}
429
430EXPORT_SYMBOL(nftnl_set_elem_expr_foreach);
431int nftnl_set_elem_expr_foreach(struct nftnl_set_elem *e,
432 int (*cb)(struct nftnl_expr *e, void *data),
433 void *data)
434{
435 struct nftnl_expr *cur, *tmp;
436 int ret;
437
438 list_for_each_entry_safe(cur, tmp, &e->expr_list, head) {
439 ret = cb(cur, data);
440 if (ret < 0)
441 return ret;
442 }
443 return 0;
444}
445
446static int nftnl_set_elem_parse_attr_cb(const struct nlattr *attr, void *data)
447{
448 const struct nlattr **tb = data;
449 int type = mnl_attr_get_type(attr);
450
451 if (mnl_attr_type_valid(attr, NFTA_SET_MAX) < 0)
452 return MNL_CB_OK;
453
454 switch(type) {
455 case NFTA_SET_ELEM_FLAGS:
456 if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
457 abi_breakage();
458 break;
459 case NFTA_SET_ELEM_TIMEOUT:
460 case NFTA_SET_ELEM_EXPIRATION:
461 if (mnl_attr_validate(attr, MNL_TYPE_U64) < 0)
462 abi_breakage();
463 break;
464 case NFTA_SET_ELEM_KEY:
465 case NFTA_SET_ELEM_KEY_END:
466 case NFTA_SET_ELEM_DATA:
467 case NFTA_SET_ELEM_EXPR:
468 case NFTA_SET_ELEM_EXPRESSIONS:
469 if (mnl_attr_validate(attr, MNL_TYPE_NESTED) < 0)
470 abi_breakage();
471 break;
472 case NFTA_SET_ELEM_USERDATA:
473 if (mnl_attr_validate(attr, MNL_TYPE_BINARY) < 0)
474 abi_breakage();
475 break;
476 }
477
478 tb[type] = attr;
479 return MNL_CB_OK;
480}
481
482static int nftnl_set_elems_parse2(struct nftnl_set *s, const struct nlattr *nest)
483{
484 struct nlattr *tb[NFTA_SET_ELEM_MAX+1] = {};
485 struct nftnl_set_elem *e;
486 int ret, type;
487
488 e = nftnl_set_elem_alloc();
489 if (e == NULL)
490 return -1;
491
492 ret = mnl_attr_parse_nested(nest, nftnl_set_elem_parse_attr_cb, tb);
493 if (ret < 0)
494 goto out_set_elem;
495
496 if (tb[NFTA_SET_ELEM_FLAGS]) {
497 e->set_elem_flags =
498 ntohl(mnl_attr_get_u32(tb[NFTA_SET_ELEM_FLAGS]));
499 e->flags |= (1 << NFTNL_SET_ELEM_FLAGS);
500 }
501 if (tb[NFTA_SET_ELEM_TIMEOUT]) {
502 e->timeout = be64toh(mnl_attr_get_u64(tb[NFTA_SET_ELEM_TIMEOUT]));
503 e->flags |= (1 << NFTNL_SET_ELEM_TIMEOUT);
504 }
505 if (tb[NFTA_SET_ELEM_EXPIRATION]) {
506 e->expiration = be64toh(mnl_attr_get_u64(tb[NFTA_SET_ELEM_EXPIRATION]));
507 e->flags |= (1 << NFTNL_SET_ELEM_EXPIRATION);
508 }
509 if (tb[NFTA_SET_ELEM_KEY]) {
510 ret = nftnl_parse_data(&e->key, tb[NFTA_SET_ELEM_KEY], &type);
511 if (ret < 0)
512 goto out_set_elem;
513 e->flags |= (1 << NFTNL_SET_ELEM_KEY);
514 }
515 if (tb[NFTA_SET_ELEM_KEY_END]) {
516 ret = nftnl_parse_data(&e->key_end, tb[NFTA_SET_ELEM_KEY_END],
517 &type);
518 if (ret < 0)
519 goto out_set_elem;
520 e->flags |= (1 << NFTNL_SET_ELEM_KEY_END);
521 }
522 if (tb[NFTA_SET_ELEM_DATA]) {
523 ret = nftnl_parse_data(&e->data, tb[NFTA_SET_ELEM_DATA], &type);
524 if (ret < 0)
525 goto out_set_elem;
526 switch(type) {
527 case DATA_VERDICT:
528 e->flags |= (1 << NFTNL_SET_ELEM_VERDICT);
529 break;
530 case DATA_CHAIN:
531 e->flags |= (1 << NFTNL_SET_ELEM_VERDICT) |
532 (1 << NFTNL_SET_ELEM_CHAIN);
533 break;
534 case DATA_VALUE:
535 e->flags |= (1 << NFTNL_SET_ELEM_DATA);
536 break;
537 }
538 }
539 if (tb[NFTA_SET_ELEM_EXPR]) {
540 struct nftnl_expr *expr;
541
542 expr = nftnl_expr_parse(tb[NFTA_SET_ELEM_EXPR]);
543 if (expr == NULL) {
544 ret = -1;
545 goto out_set_elem;
546 }
547 list_add_tail(&expr->head, &e->expr_list);
548 e->flags |= (1 << NFTNL_SET_ELEM_EXPR);
549 } else if (tb[NFTA_SET_ELEM_EXPRESSIONS]) {
550 struct nftnl_expr *expr;
551 struct nlattr *attr;
552
553 mnl_attr_for_each_nested(attr, tb[NFTA_SET_ELEM_EXPRESSIONS]) {
554 if (mnl_attr_get_type(attr) != NFTA_LIST_ELEM) {
555 ret = -1;
556 goto out_set_elem;
557 }
558 expr = nftnl_expr_parse(attr);
559 if (expr == NULL) {
560 ret = -1;
561 goto out_set_elem;
562 }
563 list_add_tail(&expr->head, &e->expr_list);
564 }
565 e->flags |= (1 << NFTNL_SET_ELEM_EXPRESSIONS);
566 }
567 if (tb[NFTA_SET_ELEM_USERDATA]) {
568 const void *udata =
569 mnl_attr_get_payload(tb[NFTA_SET_ELEM_USERDATA]);
570
571 if (e->flags & (1 << NFTNL_RULE_USERDATA))
572 xfree(e->user.data);
573
574 e->user.len = mnl_attr_get_payload_len(tb[NFTA_SET_ELEM_USERDATA]);
575 e->user.data = malloc(e->user.len);
576 if (e->user.data == NULL) {
577 ret = -1;
578 goto out_set_elem;
579 }
580 memcpy(e->user.data, udata, e->user.len);
581 e->flags |= (1 << NFTNL_RULE_USERDATA);
582 }
583 if (tb[NFTA_SET_ELEM_OBJREF]) {
584 e->objref = strdup(mnl_attr_get_str(tb[NFTA_SET_ELEM_OBJREF]));
585 if (e->objref == NULL) {
586 ret = -1;
587 goto out_set_elem;
588 }
589 e->flags |= (1 << NFTNL_SET_ELEM_OBJREF);
590 }
591
592 /* Add this new element to this set */
593 list_add_tail(&e->head, &s->element_list);
594
595 return 0;
596out_set_elem:
597 nftnl_set_elem_free(e);
598 return ret;
599}
600
601static int
602nftnl_set_elem_list_parse_attr_cb(const struct nlattr *attr, void *data)
603{
604 const struct nlattr **tb = data;
605 int type = mnl_attr_get_type(attr);
606
607 if (mnl_attr_type_valid(attr, NFTA_SET_ELEM_LIST_MAX) < 0)
608 return MNL_CB_OK;
609
610 switch(type) {
611 case NFTA_SET_ELEM_LIST_TABLE:
612 case NFTA_SET_ELEM_LIST_SET:
613 if (mnl_attr_validate(attr, MNL_TYPE_STRING) < 0)
614 abi_breakage();
615 break;
616 case NFTA_SET_ELEM_LIST_ELEMENTS:
617 if (mnl_attr_validate(attr, MNL_TYPE_NESTED) < 0)
618 abi_breakage();
619 break;
620 }
621
622 tb[type] = attr;
623 return MNL_CB_OK;
624}
625
626static int nftnl_set_elems_parse(struct nftnl_set *s, const struct nlattr *nest)
627{
628 struct nlattr *attr;
629 int ret = 0;
630
631 mnl_attr_for_each_nested(attr, nest) {
632 if (mnl_attr_get_type(attr) != NFTA_LIST_ELEM)
633 return -1;
634
635 ret = nftnl_set_elems_parse2(s, attr);
636 if (ret < 0)
637 return ret;
638 }
639 return ret;
640}
641
642EXPORT_SYMBOL(nftnl_set_elems_nlmsg_parse);
643int nftnl_set_elems_nlmsg_parse(const struct nlmsghdr *nlh, struct nftnl_set *s)
644{
645 struct nlattr *tb[NFTA_SET_ELEM_LIST_MAX+1] = {};
646 struct nfgenmsg *nfg = mnl_nlmsg_get_payload(nlh);
647 int ret;
648
649 if (mnl_attr_parse(nlh, sizeof(*nfg),
650 nftnl_set_elem_list_parse_attr_cb, tb) < 0)
651 return -1;
652
653 if (tb[NFTA_SET_ELEM_LIST_TABLE]) {
654 if (s->flags & (1 << NFTNL_SET_TABLE))
655 xfree(s->table);
656 s->table =
657 strdup(mnl_attr_get_str(tb[NFTA_SET_ELEM_LIST_TABLE]));
658 if (!s->table)
659 return -1;
660 s->flags |= (1 << NFTNL_SET_TABLE);
661 }
662 if (tb[NFTA_SET_ELEM_LIST_SET]) {
663 if (s->flags & (1 << NFTNL_SET_NAME))
664 xfree(s->name);
665 s->name =
666 strdup(mnl_attr_get_str(tb[NFTA_SET_ELEM_LIST_SET]));
667 if (!s->name)
668 return -1;
669 s->flags |= (1 << NFTNL_SET_NAME);
670 }
671 if (tb[NFTA_SET_ELEM_LIST_SET_ID]) {
672 s->id = ntohl(mnl_attr_get_u32(tb[NFTA_SET_ELEM_LIST_SET_ID]));
673 s->flags |= (1 << NFTNL_SET_ID);
674 }
675 if (tb[NFTA_SET_ELEM_LIST_ELEMENTS]) {
676 ret = nftnl_set_elems_parse(s, tb[NFTA_SET_ELEM_LIST_ELEMENTS]);
677 if (ret < 0)
678 return ret;
679 }
680
681 s->family = nfg->nfgen_family;
682 s->flags |= (1 << NFTNL_SET_FAMILY);
683
684 return 0;
685}
686
687EXPORT_SYMBOL(nftnl_set_elem_parse);
688int nftnl_set_elem_parse(struct nftnl_set_elem *e, enum nftnl_parse_type type,
689 const char *data, struct nftnl_parse_err *err)
690{
691 errno = EOPNOTSUPP;
692 return -1;
693}
694
695EXPORT_SYMBOL(nftnl_set_elem_parse_file);
696int nftnl_set_elem_parse_file(struct nftnl_set_elem *e, enum nftnl_parse_type type,
697 FILE *fp, struct nftnl_parse_err *err)
698{
699 errno = EOPNOTSUPP;
700 return -1;
701}
702
703int nftnl_set_elem_snprintf_default(char *buf, size_t remain,
704 const struct nftnl_set_elem *e)
705{
706 int ret, dregtype = DATA_VALUE, offset = 0, i;
707
708 ret = snprintf(buf, remain, "element ");
709 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
710
711 ret = nftnl_data_reg_snprintf(buf + offset, remain, &e->key,
712 DATA_F_NOPFX, DATA_VALUE);
713 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
714
715 if (e->flags & (1 << NFTNL_SET_ELEM_KEY_END)) {
716 ret = snprintf(buf + offset, remain, " - ");
717 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
718
719 ret = nftnl_data_reg_snprintf(buf + offset, remain, &e->key_end,
720 DATA_F_NOPFX, DATA_VALUE);
721 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
722 }
723
724 ret = snprintf(buf + offset, remain, " : ");
725 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
726
727 if (e->flags & (1 << NFTNL_SET_ELEM_VERDICT))
728 dregtype = DATA_VERDICT;
729
730 ret = nftnl_data_reg_snprintf(buf + offset, remain, &e->data,
731 DATA_F_NOPFX, dregtype);
732 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
733
734 ret = snprintf(buf + offset, remain, "%u [end]", e->set_elem_flags);
735 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
736
737 if (e->user.len) {
738 ret = snprintf(buf + offset, remain, " userdata = { ");
739 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
740
741 for (i = 0; i < e->user.len; i++) {
742 char *c = e->user.data;
743
744 ret = snprintf(buf + offset, remain,
745 isprint(c[i]) ? "%c" : "\\x%02hhx",
746 c[i]);
747 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
748 }
749
750 ret = snprintf(buf + offset, remain, " }");
751 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
752 }
753
754 return offset;
755}
756
757static int nftnl_set_elem_cmd_snprintf(char *buf, size_t remain,
758 const struct nftnl_set_elem *e,
759 uint32_t cmd, uint32_t type,
760 uint32_t flags)
761{
762 int ret, offset = 0;
763
764 if (type != NFTNL_OUTPUT_DEFAULT)
765 return -1;
766
767 ret = nftnl_set_elem_snprintf_default(buf + offset, remain, e);
768 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
769
770 return offset;
771}
772
773EXPORT_SYMBOL(nftnl_set_elem_snprintf);
774int nftnl_set_elem_snprintf(char *buf, size_t size,
775 const struct nftnl_set_elem *e,
776 uint32_t type, uint32_t flags)
777{
778 if (size)
779 buf[0] = '\0';
780
781 return nftnl_set_elem_cmd_snprintf(buf, size, e, nftnl_flag2cmd(flags),
782 type, flags);
783}
784
785static int nftnl_set_elem_do_snprintf(char *buf, size_t size, const void *e,
786 uint32_t cmd, uint32_t type,
787 uint32_t flags)
788{
789 return nftnl_set_elem_snprintf(buf, size, e, type, flags);
790}
791
792EXPORT_SYMBOL(nftnl_set_elem_fprintf);
793int nftnl_set_elem_fprintf(FILE *fp, const struct nftnl_set_elem *se, uint32_t type,
794 uint32_t flags)
795{
796 return nftnl_fprintf(fp, se, NFTNL_CMD_UNSPEC, type, flags,
797 nftnl_set_elem_do_snprintf);
798}
799
800EXPORT_SYMBOL(nftnl_set_elem_foreach);
801int nftnl_set_elem_foreach(struct nftnl_set *s,
802 int (*cb)(struct nftnl_set_elem *e, void *data),
803 void *data)
804{
805 struct nftnl_set_elem *elem;
806 int ret;
807
808 list_for_each_entry(elem, &s->element_list, head) {
809 ret = cb(elem, data);
810 if (ret < 0)
811 return ret;
812 }
813 return 0;
814}
815
817 const struct nftnl_set *set;
818 const struct list_head *list;
819 struct nftnl_set_elem *cur;
820};
821
822EXPORT_SYMBOL(nftnl_set_elems_iter_create);
824nftnl_set_elems_iter_create(const struct nftnl_set *s)
825{
826 struct nftnl_set_elems_iter *iter;
827
828 iter = calloc(1, sizeof(struct nftnl_set_elems_iter));
829 if (iter == NULL)
830 return NULL;
831
832 iter->set = s;
833 iter->list = &s->element_list;
834 if (list_empty(&s->element_list))
835 iter->cur = NULL;
836 else
837 iter->cur = list_entry(s->element_list.next,
838 struct nftnl_set_elem, head);
839
840 return iter;
841}
842
843EXPORT_SYMBOL(nftnl_set_elems_iter_cur);
844struct nftnl_set_elem *
845nftnl_set_elems_iter_cur(const struct nftnl_set_elems_iter *iter)
846{
847 return iter->cur;
848}
849
850EXPORT_SYMBOL(nftnl_set_elems_iter_next);
851struct nftnl_set_elem *nftnl_set_elems_iter_next(struct nftnl_set_elems_iter *iter)
852{
853 struct nftnl_set_elem *s = iter->cur;
854
855 if (s == NULL)
856 return NULL;
857
858 iter->cur = list_entry(iter->cur->head.next, struct nftnl_set_elem, head);
859 if (&iter->cur->head == iter->list->next)
860 return NULL;
861
862 return s;
863}
864
865EXPORT_SYMBOL(nftnl_set_elems_iter_destroy);
866void nftnl_set_elems_iter_destroy(struct nftnl_set_elems_iter *iter)
867{
868 xfree(iter);
869}
870
871static bool nftnl_attr_nest_overflow(struct nlmsghdr *nlh,
872 const struct nlattr *from,
873 const struct nlattr *to)
874{
875 int len = (void *)to + to->nla_len - (void *)from;
876
877 /* The attribute length field is 16 bits long, thus the maximum payload
878 * that an attribute can convey is UINT16_MAX. In case of overflow,
879 * discard the last that did not fit into the attribute.
880 */
881 if (len > UINT16_MAX) {
882 nlh->nlmsg_len -= to->nla_len;
883 return true;
884 }
885 return false;
886}
887
888EXPORT_SYMBOL(nftnl_set_elems_nlmsg_build_payload_iter);
889int nftnl_set_elems_nlmsg_build_payload_iter(struct nlmsghdr *nlh,
890 struct nftnl_set_elems_iter *iter)
891{
892 struct nftnl_set_elem *elem;
893 struct nlattr *nest1, *nest2;
894 int i = 0, ret = 0;
895
896 nftnl_set_elem_nlmsg_build_def(nlh, iter->set);
897
898 /* This set is empty, don't add an empty list element nest. */
899 if (list_empty(&iter->set->element_list))
900 return ret;
901
902 nest1 = mnl_attr_nest_start(nlh, NFTA_SET_ELEM_LIST_ELEMENTS);
903 elem = nftnl_set_elems_iter_next(iter);
904 while (elem != NULL) {
905 nest2 = nftnl_set_elem_nlmsg_build(nlh, elem, ++i);
906 if (nftnl_attr_nest_overflow(nlh, nest1, nest2)) {
907 /* Go back to previous not to miss this element */
908 iter->cur = list_entry(iter->cur->head.prev,
909 struct nftnl_set_elem, head);
910 ret = 1;
911 break;
912 }
913 elem = nftnl_set_elems_iter_next(iter);
914 }
915 mnl_attr_nest_end(nlh, nest1);
916
917 return ret;
918}