libnftnl 1.3.2
set_elem.c
1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * (C) 2012-2013 by Pablo Neira Ayuso <pablo@netfilter.org>
4 *
5 * This code has been sponsored by Sophos Astaro <http://www.sophos.com>
6 */
7#include "internal.h"
8
9#include <time.h>
10#include <endian.h>
11#include <stdint.h>
12#include <stdlib.h>
13#include <string.h>
14#include <netinet/in.h>
15#include <errno.h>
16#include <ctype.h>
17
18#include <libmnl/libmnl.h>
19#include <linux/netfilter/nfnetlink.h>
20#include <linux/netfilter/nf_tables.h>
21
22#include <libnftnl/set.h>
23#include <libnftnl/rule.h>
24#include <libnftnl/expr.h>
25
26EXPORT_SYMBOL(nftnl_set_elem_alloc);
27struct nftnl_set_elem *nftnl_set_elem_alloc(void)
28{
29 struct nftnl_set_elem *s;
30
31 s = calloc(1, sizeof(struct nftnl_set_elem));
32 if (s == NULL)
33 return NULL;
34
35 INIT_LIST_HEAD(&s->expr_list);
36
37 return s;
38}
39
40EXPORT_SYMBOL(nftnl_set_elem_free);
41void nftnl_set_elem_free(struct nftnl_set_elem *s)
42{
43 struct nftnl_expr *e, *tmp;
44
45 if (s->flags & (1 << NFTNL_SET_ELEM_CHAIN))
46 xfree(s->data.chain);
47
48 list_for_each_entry_safe(e, tmp, &s->expr_list, head)
49 nftnl_expr_free(e);
50
51 if (s->flags & (1 << NFTNL_SET_ELEM_USERDATA))
52 xfree(s->user.data);
53
54 if (s->flags & (1 << NFTNL_SET_ELEM_OBJREF))
55 xfree(s->objref);
56
57 xfree(s);
58}
59
60EXPORT_SYMBOL(nftnl_set_elem_is_set);
61bool nftnl_set_elem_is_set(const struct nftnl_set_elem *s, uint16_t attr)
62{
63 return s->flags & (1 << attr);
64}
65
66EXPORT_SYMBOL(nftnl_set_elem_unset);
67void nftnl_set_elem_unset(struct nftnl_set_elem *s, uint16_t attr)
68{
69 struct nftnl_expr *expr, *tmp;
70
71 if (!(s->flags & (1 << attr)))
72 return;
73
74 switch (attr) {
75 case NFTNL_SET_ELEM_CHAIN:
76 xfree(s->data.chain);
77 break;
78 case NFTNL_SET_ELEM_FLAGS:
79 case NFTNL_SET_ELEM_KEY: /* NFTA_SET_ELEM_KEY */
80 case NFTNL_SET_ELEM_KEY_END: /* NFTA_SET_ELEM_KEY_END */
81 case NFTNL_SET_ELEM_VERDICT: /* NFTA_SET_ELEM_DATA */
82 case NFTNL_SET_ELEM_DATA: /* NFTA_SET_ELEM_DATA */
83 case NFTNL_SET_ELEM_TIMEOUT: /* NFTA_SET_ELEM_TIMEOUT */
84 case NFTNL_SET_ELEM_EXPIRATION: /* NFTA_SET_ELEM_EXPIRATION */
85 break;
86 case NFTNL_SET_ELEM_USERDATA: /* NFTA_SET_ELEM_USERDATA */
87 xfree(s->user.data);
88 break;
89 case NFTNL_SET_ELEM_EXPR:
90 case NFTNL_SET_ELEM_EXPRESSIONS:
91 list_for_each_entry_safe(expr, tmp, &s->expr_list, head)
92 nftnl_expr_free(expr);
93 break;
94 case NFTNL_SET_ELEM_OBJREF:
95 xfree(s->objref);
96 break;
97 default:
98 return;
99 }
100
101 s->flags &= ~(1 << attr);
102}
103
104static uint32_t nftnl_set_elem_validate[NFTNL_SET_ELEM_MAX + 1] = {
105 [NFTNL_SET_ELEM_FLAGS] = sizeof(uint32_t),
106 [NFTNL_SET_ELEM_VERDICT] = sizeof(uint32_t),
107 [NFTNL_SET_ELEM_TIMEOUT] = sizeof(uint64_t),
108 [NFTNL_SET_ELEM_EXPIRATION] = sizeof(uint64_t),
109};
110
111static int
112__nftnl_set_elem_set(struct nftnl_set_elem *s, uint16_t attr, const void *data,
113 uint32_t data_len, uint32_t byteorder, uint8_t *sizes)
114{
115 struct nftnl_expr *expr, *tmp;
116
117 nftnl_assert_attr_exists(attr, NFTNL_SET_ELEM_MAX);
118 nftnl_assert_validate(data, nftnl_set_elem_validate, attr, data_len);
119
120 switch(attr) {
121 case NFTNL_SET_ELEM_FLAGS:
122 memcpy(&s->set_elem_flags, data, sizeof(s->set_elem_flags));
123 break;
124 case NFTNL_SET_ELEM_KEY: /* NFTA_SET_ELEM_KEY */
125 if (nftnl_data_cpy(&s->key, data,
126 data_len, byteorder, sizes) < 0)
127 return -1;
128 break;
129 case NFTNL_SET_ELEM_KEY_END: /* NFTA_SET_ELEM_KEY_END */
130 if (nftnl_data_cpy(&s->key_end, data,
131 data_len, byteorder, sizes) < 0)
132 return -1;
133 break;
134 case NFTNL_SET_ELEM_VERDICT: /* NFTA_SET_ELEM_DATA */
135 memcpy(&s->data.verdict, data, sizeof(s->data.verdict));
136 break;
137 case NFTNL_SET_ELEM_CHAIN: /* NFTA_SET_ELEM_DATA */
138 if (s->flags & (1 << NFTNL_SET_ELEM_CHAIN))
139 xfree(s->data.chain);
140
141 s->data.chain = strdup(data);
142 if (!s->data.chain)
143 return -1;
144 break;
145 case NFTNL_SET_ELEM_DATA: /* NFTA_SET_ELEM_DATA */
146 if (nftnl_data_cpy(&s->data, data,
147 data_len, byteorder, sizes) < 0)
148 return -1;
149 break;
150 case NFTNL_SET_ELEM_TIMEOUT: /* NFTA_SET_ELEM_TIMEOUT */
151 memcpy(&s->timeout, data, sizeof(s->timeout));
152 break;
153 case NFTNL_SET_ELEM_EXPIRATION: /* NFTA_SET_ELEM_EXPIRATION */
154 memcpy(&s->expiration, data, sizeof(s->expiration));
155 break;
156 case NFTNL_SET_ELEM_USERDATA: /* NFTA_SET_ELEM_USERDATA */
157 if (s->flags & (1 << NFTNL_SET_ELEM_USERDATA))
158 xfree(s->user.data);
159
160 s->user.data = malloc(data_len);
161 if (!s->user.data)
162 return -1;
163 memcpy(s->user.data, data, data_len);
164 s->user.len = data_len;
165 break;
166 case NFTNL_SET_ELEM_OBJREF:
167 if (s->flags & (1 << NFTNL_SET_ELEM_OBJREF))
168 xfree(s->objref);
169
170 s->objref = strdup(data);
171 if (!s->objref)
172 return -1;
173 break;
174 case NFTNL_SET_ELEM_EXPR:
175 list_for_each_entry_safe(expr, tmp, &s->expr_list, head)
176 nftnl_expr_free(expr);
177
178 expr = (void *)data;
179 list_add(&expr->head, &s->expr_list);
180 break;
181 }
182 s->flags |= (1 << attr);
183 return 0;
184}
185
186EXPORT_SYMBOL(nftnl_set_elem_set);
187int nftnl_set_elem_set(struct nftnl_set_elem *s, uint16_t attr,
188 const void *data, uint32_t data_len)
189{
190 return __nftnl_set_elem_set(s, attr, data, data_len, 0, NULL);
191}
192
193EXPORT_SYMBOL(nftnl_set_elem_set_imm);
194int nftnl_set_elem_set_imm(struct nftnl_set_elem *s, uint16_t attr,
195 const void *data, uint32_t data_len,
196 uint32_t byteorder, uint8_t *sizes)
197{
198 return __nftnl_set_elem_set(s, attr, data, data_len, byteorder, sizes);
199}
200
201EXPORT_SYMBOL(nftnl_set_elem_set_u32);
202void nftnl_set_elem_set_u32(struct nftnl_set_elem *s, uint16_t attr, uint32_t val)
203{
204 nftnl_set_elem_set(s, attr, &val, sizeof(uint32_t));
205}
206
207EXPORT_SYMBOL(nftnl_set_elem_set_u64);
208void nftnl_set_elem_set_u64(struct nftnl_set_elem *s, uint16_t attr, uint64_t val)
209{
210 nftnl_set_elem_set(s, attr, &val, sizeof(uint64_t));
211}
212
213EXPORT_SYMBOL(nftnl_set_elem_set_str);
214int nftnl_set_elem_set_str(struct nftnl_set_elem *s, uint16_t attr, const char *str)
215{
216 return nftnl_set_elem_set(s, attr, str, strlen(str) + 1);
217}
218
219EXPORT_SYMBOL(nftnl_set_elem_get);
220const void *nftnl_set_elem_get(struct nftnl_set_elem *s, uint16_t attr, uint32_t *data_len)
221{
222 struct nftnl_expr *expr;
223
224 if (!(s->flags & (1 << attr)))
225 return NULL;
226
227 switch(attr) {
228 case NFTNL_SET_ELEM_FLAGS:
229 *data_len = sizeof(s->set_elem_flags);
230 return &s->set_elem_flags;
231 case NFTNL_SET_ELEM_KEY: /* NFTA_SET_ELEM_KEY */
232 *data_len = s->key.len;
233 return &s->key.val;
234 case NFTNL_SET_ELEM_KEY_END: /* NFTA_SET_ELEM_KEY_END */
235 *data_len = s->key_end.len;
236 return &s->key_end.val;
237 case NFTNL_SET_ELEM_VERDICT: /* NFTA_SET_ELEM_DATA */
238 *data_len = sizeof(s->data.verdict);
239 return &s->data.verdict;
240 case NFTNL_SET_ELEM_CHAIN: /* NFTA_SET_ELEM_DATA */
241 *data_len = strlen(s->data.chain) + 1;
242 return s->data.chain;
243 case NFTNL_SET_ELEM_DATA: /* NFTA_SET_ELEM_DATA */
244 *data_len = s->data.len;
245 return &s->data.val;
246 case NFTNL_SET_ELEM_TIMEOUT: /* NFTA_SET_ELEM_TIMEOUT */
247 *data_len = sizeof(s->timeout);
248 return &s->timeout;
249 case NFTNL_SET_ELEM_EXPIRATION: /* NFTA_SET_ELEM_EXPIRATION */
250 *data_len = sizeof(s->expiration);
251 return &s->expiration;
252 case NFTNL_SET_ELEM_USERDATA:
253 *data_len = s->user.len;
254 return s->user.data;
255 case NFTNL_SET_ELEM_EXPR:
256 list_for_each_entry(expr, &s->expr_list, head)
257 break;
258 return expr;
259 case NFTNL_SET_ELEM_OBJREF:
260 *data_len = strlen(s->objref) + 1;
261 return s->objref;
262 }
263 return NULL;
264}
265
266EXPORT_SYMBOL(nftnl_set_elem_get_str);
267const char *nftnl_set_elem_get_str(struct nftnl_set_elem *s, uint16_t attr)
268{
269 uint32_t size;
270
271 return nftnl_set_elem_get(s, attr, &size);
272}
273
274EXPORT_SYMBOL(nftnl_set_elem_get_u32);
275uint32_t nftnl_set_elem_get_u32(struct nftnl_set_elem *s, uint16_t attr)
276{
277 uint32_t size, val;
278
279 memcpy(&val, nftnl_set_elem_get(s, attr, &size), sizeof(val));
280
281 return val;
282}
283
284EXPORT_SYMBOL(nftnl_set_elem_get_u64);
285uint64_t nftnl_set_elem_get_u64(struct nftnl_set_elem *s, uint16_t attr)
286{
287 uint32_t size;
288 uint64_t val;
289
290 memcpy(&val, nftnl_set_elem_get(s, attr, &size), sizeof(val));
291
292 return val;
293}
294
295EXPORT_SYMBOL(nftnl_set_elem_nlmsg_build_payload);
296void nftnl_set_elem_nlmsg_build_payload(struct nlmsghdr *nlh,
297 struct nftnl_set_elem *e)
298{
299 struct nftnl_expr *expr;
300 int num_exprs = 0;
301
302 if (e->flags & (1 << NFTNL_SET_ELEM_FLAGS))
303 mnl_attr_put_u32(nlh, NFTA_SET_ELEM_FLAGS, htonl(e->set_elem_flags));
304 if (e->flags & (1 << NFTNL_SET_ELEM_TIMEOUT))
305 mnl_attr_put_u64(nlh, NFTA_SET_ELEM_TIMEOUT, htobe64(e->timeout));
306 if (e->flags & (1 << NFTNL_SET_ELEM_EXPIRATION))
307 mnl_attr_put_u64(nlh, NFTA_SET_ELEM_EXPIRATION, htobe64(e->expiration));
308 if (e->flags & (1 << NFTNL_SET_ELEM_KEY)) {
309 struct nlattr *nest1;
310
311 nest1 = mnl_attr_nest_start(nlh, NFTA_SET_ELEM_KEY);
312 mnl_attr_put(nlh, NFTA_DATA_VALUE, e->key.len, e->key.val);
313 mnl_attr_nest_end(nlh, nest1);
314 }
315 if (e->flags & (1 << NFTNL_SET_ELEM_KEY_END)) {
316 struct nlattr *nest1;
317
318 nest1 = mnl_attr_nest_start(nlh, NFTA_SET_ELEM_KEY_END);
319 mnl_attr_put(nlh, NFTA_DATA_VALUE, e->key_end.len,
320 e->key_end.val);
321 mnl_attr_nest_end(nlh, nest1);
322 }
323 if (e->flags & (1 << NFTNL_SET_ELEM_VERDICT)) {
324 struct nlattr *nest1, *nest2;
325
326 nest1 = mnl_attr_nest_start(nlh, NFTA_SET_ELEM_DATA);
327 nest2 = mnl_attr_nest_start(nlh, NFTA_DATA_VERDICT);
328 mnl_attr_put_u32(nlh, NFTA_VERDICT_CODE, htonl(e->data.verdict));
329 if (e->flags & (1 << NFTNL_SET_ELEM_CHAIN))
330 mnl_attr_put_strz(nlh, NFTA_VERDICT_CHAIN, e->data.chain);
331
332 mnl_attr_nest_end(nlh, nest1);
333 mnl_attr_nest_end(nlh, nest2);
334 }
335 if (e->flags & (1 << NFTNL_SET_ELEM_DATA)) {
336 struct nlattr *nest1;
337
338 nest1 = mnl_attr_nest_start(nlh, NFTA_SET_ELEM_DATA);
339 mnl_attr_put(nlh, NFTA_DATA_VALUE, e->data.len, e->data.val);
340 mnl_attr_nest_end(nlh, nest1);
341 }
342 if (e->flags & (1 << NFTNL_SET_ELEM_USERDATA))
343 mnl_attr_put(nlh, NFTA_SET_ELEM_USERDATA, e->user.len, e->user.data);
344 if (e->flags & (1 << NFTNL_SET_ELEM_OBJREF))
345 mnl_attr_put_strz(nlh, NFTA_SET_ELEM_OBJREF, e->objref);
346
347 if (!list_empty(&e->expr_list)) {
348 list_for_each_entry(expr, &e->expr_list, head)
349 num_exprs++;
350
351 if (num_exprs == 1) {
352 struct nlattr *nest1;
353
354 nest1 = mnl_attr_nest_start(nlh, NFTA_SET_ELEM_EXPR);
355 list_for_each_entry(expr, &e->expr_list, head)
356 nftnl_expr_build_payload(nlh, expr);
357
358 mnl_attr_nest_end(nlh, nest1);
359 } else if (num_exprs > 1) {
360 struct nlattr *nest1, *nest2;
361
362 nest1 = mnl_attr_nest_start(nlh, NFTA_SET_ELEM_EXPRESSIONS);
363 list_for_each_entry(expr, &e->expr_list, head) {
364 nest2 = mnl_attr_nest_start(nlh, NFTA_LIST_ELEM);
365 nftnl_expr_build_payload(nlh, expr);
366 mnl_attr_nest_end(nlh, nest2);
367 }
368 mnl_attr_nest_end(nlh, nest1);
369 }
370 }
371}
372
373static void nftnl_set_elem_nlmsg_build_def(struct nlmsghdr *nlh,
374 const struct nftnl_set *s)
375{
376 if (s->flags & (1 << NFTNL_SET_NAME))
377 mnl_attr_put_strz(nlh, NFTA_SET_ELEM_LIST_SET, s->name);
378 if (s->flags & (1 << NFTNL_SET_ID))
379 mnl_attr_put_u32(nlh, NFTA_SET_ELEM_LIST_SET_ID, htonl(s->id));
380 if (s->flags & (1 << NFTNL_SET_TABLE))
381 mnl_attr_put_strz(nlh, NFTA_SET_ELEM_LIST_TABLE, s->table);
382}
383
384EXPORT_SYMBOL(nftnl_set_elem_nlmsg_build);
385struct nlattr *nftnl_set_elem_nlmsg_build(struct nlmsghdr *nlh,
386 struct nftnl_set_elem *elem, int i)
387{
388 struct nlattr *nest2;
389
390 nest2 = mnl_attr_nest_start(nlh, i);
391 nftnl_set_elem_nlmsg_build_payload(nlh, elem);
392 mnl_attr_nest_end(nlh, nest2);
393
394 return nest2;
395}
396
397EXPORT_SYMBOL(nftnl_set_elems_nlmsg_build_payload);
398void nftnl_set_elems_nlmsg_build_payload(struct nlmsghdr *nlh, struct nftnl_set *s)
399{
400 struct nftnl_set_elem *elem;
401 struct nlattr *nest1;
402 int i = 0;
403
404 nftnl_set_elem_nlmsg_build_def(nlh, s);
405
406 if (list_empty(&s->element_list))
407 return;
408
409 nest1 = mnl_attr_nest_start(nlh, NFTA_SET_ELEM_LIST_ELEMENTS);
410 list_for_each_entry(elem, &s->element_list, head)
411 nftnl_set_elem_nlmsg_build(nlh, elem, ++i);
412
413 mnl_attr_nest_end(nlh, nest1);
414}
415
416EXPORT_SYMBOL(nftnl_set_elem_add_expr);
417void nftnl_set_elem_add_expr(struct nftnl_set_elem *e, struct nftnl_expr *expr)
418{
419 list_add_tail(&expr->head, &e->expr_list);
420}
421
422EXPORT_SYMBOL(nftnl_set_elem_expr_foreach);
423int nftnl_set_elem_expr_foreach(struct nftnl_set_elem *e,
424 int (*cb)(struct nftnl_expr *e, void *data),
425 void *data)
426{
427 struct nftnl_expr *cur, *tmp;
428 int ret;
429
430 list_for_each_entry_safe(cur, tmp, &e->expr_list, head) {
431 ret = cb(cur, data);
432 if (ret < 0)
433 return ret;
434 }
435 return 0;
436}
437
438static int nftnl_set_elem_parse_attr_cb(const struct nlattr *attr, void *data)
439{
440 const struct nlattr **tb = data;
441 int type = mnl_attr_get_type(attr);
442
443 if (mnl_attr_type_valid(attr, NFTA_SET_MAX) < 0)
444 return MNL_CB_OK;
445
446 switch(type) {
447 case NFTA_SET_ELEM_FLAGS:
448 if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
449 abi_breakage();
450 break;
451 case NFTA_SET_ELEM_TIMEOUT:
452 case NFTA_SET_ELEM_EXPIRATION:
453 if (mnl_attr_validate(attr, MNL_TYPE_U64) < 0)
454 abi_breakage();
455 break;
456 case NFTA_SET_ELEM_KEY:
457 case NFTA_SET_ELEM_KEY_END:
458 case NFTA_SET_ELEM_DATA:
459 case NFTA_SET_ELEM_EXPR:
460 case NFTA_SET_ELEM_EXPRESSIONS:
461 if (mnl_attr_validate(attr, MNL_TYPE_NESTED) < 0)
462 abi_breakage();
463 break;
464 case NFTA_SET_ELEM_USERDATA:
465 if (mnl_attr_validate(attr, MNL_TYPE_BINARY) < 0)
466 abi_breakage();
467 break;
468 }
469
470 tb[type] = attr;
471 return MNL_CB_OK;
472}
473
474static int nftnl_set_elems_parse2(struct nftnl_set *s, const struct nlattr *nest)
475{
476 struct nlattr *tb[NFTA_SET_ELEM_MAX+1] = {};
477 struct nftnl_set_elem *e;
478 int ret, type;
479
480 e = nftnl_set_elem_alloc();
481 if (e == NULL)
482 return -1;
483
484 ret = mnl_attr_parse_nested(nest, nftnl_set_elem_parse_attr_cb, tb);
485 if (ret < 0)
486 goto out_set_elem;
487
488 if (tb[NFTA_SET_ELEM_FLAGS]) {
489 e->set_elem_flags =
490 ntohl(mnl_attr_get_u32(tb[NFTA_SET_ELEM_FLAGS]));
491 e->flags |= (1 << NFTNL_SET_ELEM_FLAGS);
492 }
493 if (tb[NFTA_SET_ELEM_TIMEOUT]) {
494 e->timeout = be64toh(mnl_attr_get_u64(tb[NFTA_SET_ELEM_TIMEOUT]));
495 e->flags |= (1 << NFTNL_SET_ELEM_TIMEOUT);
496 }
497 if (tb[NFTA_SET_ELEM_EXPIRATION]) {
498 e->expiration = be64toh(mnl_attr_get_u64(tb[NFTA_SET_ELEM_EXPIRATION]));
499 e->flags |= (1 << NFTNL_SET_ELEM_EXPIRATION);
500 }
501 if (tb[NFTA_SET_ELEM_KEY]) {
502 ret = nftnl_parse_data(&e->key, tb[NFTA_SET_ELEM_KEY], &type);
503 if (ret < 0)
504 goto out_set_elem;
505 e->flags |= (1 << NFTNL_SET_ELEM_KEY);
506 }
507 if (tb[NFTA_SET_ELEM_KEY_END]) {
508 ret = nftnl_parse_data(&e->key_end, tb[NFTA_SET_ELEM_KEY_END],
509 &type);
510 if (ret < 0)
511 goto out_set_elem;
512 e->flags |= (1 << NFTNL_SET_ELEM_KEY_END);
513 }
514 if (tb[NFTA_SET_ELEM_DATA]) {
515 ret = nftnl_parse_data(&e->data, tb[NFTA_SET_ELEM_DATA], &type);
516 if (ret < 0)
517 goto out_set_elem;
518 switch(type) {
519 case DATA_VERDICT:
520 e->flags |= (1 << NFTNL_SET_ELEM_VERDICT);
521 break;
522 case DATA_CHAIN:
523 e->flags |= (1 << NFTNL_SET_ELEM_VERDICT) |
524 (1 << NFTNL_SET_ELEM_CHAIN);
525 break;
526 case DATA_VALUE:
527 e->flags |= (1 << NFTNL_SET_ELEM_DATA);
528 break;
529 }
530 }
531 if (tb[NFTA_SET_ELEM_EXPR]) {
532 struct nftnl_expr *expr;
533
534 expr = nftnl_expr_parse(tb[NFTA_SET_ELEM_EXPR]);
535 if (expr == NULL) {
536 ret = -1;
537 goto out_set_elem;
538 }
539 list_add_tail(&expr->head, &e->expr_list);
540 e->flags |= (1 << NFTNL_SET_ELEM_EXPR);
541 } else if (tb[NFTA_SET_ELEM_EXPRESSIONS]) {
542 struct nftnl_expr *expr;
543 struct nlattr *attr;
544
545 mnl_attr_for_each_nested(attr, tb[NFTA_SET_ELEM_EXPRESSIONS]) {
546 if (mnl_attr_get_type(attr) != NFTA_LIST_ELEM) {
547 ret = -1;
548 goto out_set_elem;
549 }
550 expr = nftnl_expr_parse(attr);
551 if (expr == NULL) {
552 ret = -1;
553 goto out_set_elem;
554 }
555 list_add_tail(&expr->head, &e->expr_list);
556 }
557 e->flags |= (1 << NFTNL_SET_ELEM_EXPRESSIONS);
558 }
559 if (tb[NFTA_SET_ELEM_USERDATA]) {
560 const void *udata =
561 mnl_attr_get_payload(tb[NFTA_SET_ELEM_USERDATA]);
562
563 if (e->flags & (1 << NFTNL_RULE_USERDATA))
564 xfree(e->user.data);
565
566 e->user.len = mnl_attr_get_payload_len(tb[NFTA_SET_ELEM_USERDATA]);
567 e->user.data = malloc(e->user.len);
568 if (e->user.data == NULL) {
569 ret = -1;
570 goto out_set_elem;
571 }
572 memcpy(e->user.data, udata, e->user.len);
573 e->flags |= (1 << NFTNL_RULE_USERDATA);
574 }
575 if (nftnl_parse_str_attr(tb[NFTA_SET_ELEM_OBJREF],
576 NFTNL_SET_ELEM_OBJREF,
577 &e->objref, &e->flags) < 0) {
578 ret = -1;
579 goto out_set_elem;
580 }
581
582 /* Add this new element to this set */
583 list_add_tail(&e->head, &s->element_list);
584
585 return 0;
586out_set_elem:
587 nftnl_set_elem_free(e);
588 return ret;
589}
590
591static int
592nftnl_set_elem_list_parse_attr_cb(const struct nlattr *attr, void *data)
593{
594 const struct nlattr **tb = data;
595 int type = mnl_attr_get_type(attr);
596
597 if (mnl_attr_type_valid(attr, NFTA_SET_ELEM_LIST_MAX) < 0)
598 return MNL_CB_OK;
599
600 switch(type) {
601 case NFTA_SET_ELEM_LIST_TABLE:
602 case NFTA_SET_ELEM_LIST_SET:
603 if (mnl_attr_validate(attr, MNL_TYPE_STRING) < 0)
604 abi_breakage();
605 break;
606 case NFTA_SET_ELEM_LIST_ELEMENTS:
607 if (mnl_attr_validate(attr, MNL_TYPE_NESTED) < 0)
608 abi_breakage();
609 break;
610 }
611
612 tb[type] = attr;
613 return MNL_CB_OK;
614}
615
616static int nftnl_set_elems_parse(struct nftnl_set *s, const struct nlattr *nest)
617{
618 struct nlattr *attr;
619 int ret = 0;
620
621 mnl_attr_for_each_nested(attr, nest) {
622 if (mnl_attr_get_type(attr) != NFTA_LIST_ELEM)
623 return -1;
624
625 ret = nftnl_set_elems_parse2(s, attr);
626 if (ret < 0)
627 return ret;
628 }
629 return ret;
630}
631
632EXPORT_SYMBOL(nftnl_set_elems_nlmsg_parse);
633int nftnl_set_elems_nlmsg_parse(const struct nlmsghdr *nlh, struct nftnl_set *s)
634{
635 struct nlattr *tb[NFTA_SET_ELEM_LIST_MAX+1] = {};
636 struct nfgenmsg *nfg = mnl_nlmsg_get_payload(nlh);
637 int ret;
638
639 if (mnl_attr_parse(nlh, sizeof(*nfg),
640 nftnl_set_elem_list_parse_attr_cb, tb) < 0)
641 return -1;
642
643 if (nftnl_parse_str_attr(tb[NFTA_SET_ELEM_LIST_TABLE],
644 NFTNL_SET_TABLE,
645 &s->table, &s->flags) < 0)
646 return -1;
647 if (nftnl_parse_str_attr(tb[NFTA_SET_ELEM_LIST_SET],
648 NFTNL_SET_NAME,
649 &s->name, &s->flags) < 0)
650 return -1;
651 if (tb[NFTA_SET_ELEM_LIST_SET_ID]) {
652 s->id = ntohl(mnl_attr_get_u32(tb[NFTA_SET_ELEM_LIST_SET_ID]));
653 s->flags |= (1 << NFTNL_SET_ID);
654 }
655 if (tb[NFTA_SET_ELEM_LIST_ELEMENTS]) {
656 ret = nftnl_set_elems_parse(s, tb[NFTA_SET_ELEM_LIST_ELEMENTS]);
657 if (ret < 0)
658 return ret;
659 }
660
661 s->family = nfg->nfgen_family;
662 s->flags |= (1 << NFTNL_SET_FAMILY);
663
664 return 0;
665}
666
667EXPORT_SYMBOL(nftnl_set_elem_parse);
668int nftnl_set_elem_parse(struct nftnl_set_elem *e, enum nftnl_parse_type type,
669 const char *data, struct nftnl_parse_err *err)
670{
671 errno = EOPNOTSUPP;
672 return -1;
673}
674
675EXPORT_SYMBOL(nftnl_set_elem_parse_file);
676int nftnl_set_elem_parse_file(struct nftnl_set_elem *e, enum nftnl_parse_type type,
677 FILE *fp, struct nftnl_parse_err *err)
678{
679 errno = EOPNOTSUPP;
680 return -1;
681}
682
683int nftnl_set_elem_snprintf_default(char *buf, size_t remain,
684 const struct nftnl_set_elem *e)
685{
686 int ret, dregtype = DATA_NONE, offset = 0;
687
688 ret = snprintf(buf, remain, "element ");
689 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
690
691 ret = nftnl_data_reg_snprintf(buf + offset, remain, &e->key,
692 DATA_F_NOPFX, DATA_VALUE);
693 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
694
695 if (e->flags & (1 << NFTNL_SET_ELEM_KEY_END)) {
696 ret = snprintf(buf + offset, remain, " - ");
697 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
698
699 ret = nftnl_data_reg_snprintf(buf + offset, remain, &e->key_end,
700 DATA_F_NOPFX, DATA_VALUE);
701 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
702 }
703
704 if (e->flags & (1 << NFTNL_SET_ELEM_DATA))
705 dregtype = DATA_VALUE;
706 else if (e->flags & (1 << NFTNL_SET_ELEM_CHAIN))
707 dregtype = DATA_CHAIN;
708 else if (e->flags & (1 << NFTNL_SET_ELEM_VERDICT))
709 dregtype = DATA_VERDICT;
710
711 if (dregtype != DATA_NONE) {
712 ret = snprintf(buf + offset, remain, " : ");
713 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
714
715 ret = nftnl_data_reg_snprintf(buf + offset, remain, &e->data,
716 DATA_F_NOPFX, dregtype);
717 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
718 } else if (e->flags & (1 << NFTNL_SET_ELEM_OBJREF)) {
719 ret = snprintf(buf + offset, remain, " : %s", e->objref);
720 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
721 }
722
723 if (e->set_elem_flags) {
724 ret = snprintf(buf + offset, remain, " flags %u", e->set_elem_flags);
725 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
726 }
727
728 if (e->user.len) {
729 ret = snprintf(buf + offset, remain,
730 " userdata len %d sum 0x%x",
731 e->user.len, bytesum(e->user.data, e->user.len));
732 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
733 }
734
735 return offset;
736}
737
738static int nftnl_set_elem_cmd_snprintf(char *buf, size_t remain,
739 const struct nftnl_set_elem *e,
740 uint32_t cmd, uint32_t type,
741 uint32_t flags)
742{
743 int ret, offset = 0;
744
745 if (type != NFTNL_OUTPUT_DEFAULT)
746 return -1;
747
748 ret = nftnl_set_elem_snprintf_default(buf + offset, remain, e);
749 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
750
751 return offset;
752}
753
754EXPORT_SYMBOL(nftnl_set_elem_snprintf);
755int nftnl_set_elem_snprintf(char *buf, size_t size,
756 const struct nftnl_set_elem *e,
757 uint32_t type, uint32_t flags)
758{
759 if (size)
760 buf[0] = '\0';
761
762 return nftnl_set_elem_cmd_snprintf(buf, size, e, nftnl_flag2cmd(flags),
763 type, flags);
764}
765
766static int nftnl_set_elem_do_snprintf(char *buf, size_t size, const void *e,
767 uint32_t cmd, uint32_t type,
768 uint32_t flags)
769{
770 return nftnl_set_elem_snprintf(buf, size, e, type, flags);
771}
772
773EXPORT_SYMBOL(nftnl_set_elem_fprintf);
774int nftnl_set_elem_fprintf(FILE *fp, const struct nftnl_set_elem *se, uint32_t type,
775 uint32_t flags)
776{
777 return nftnl_fprintf(fp, se, NFTNL_CMD_UNSPEC, type, flags,
778 nftnl_set_elem_do_snprintf);
779}
780
781EXPORT_SYMBOL(nftnl_set_elem_foreach);
782int nftnl_set_elem_foreach(struct nftnl_set *s,
783 int (*cb)(struct nftnl_set_elem *e, void *data),
784 void *data)
785{
786 struct nftnl_set_elem *elem;
787 int ret;
788
789 list_for_each_entry(elem, &s->element_list, head) {
790 ret = cb(elem, data);
791 if (ret < 0)
792 return ret;
793 }
794 return 0;
795}
796
797struct nftnl_set_elems_iter {
798 const struct nftnl_set *set;
799 const struct list_head *list;
800 struct nftnl_set_elem *cur;
801};
802
803EXPORT_SYMBOL(nftnl_set_elems_iter_create);
804struct nftnl_set_elems_iter *
805nftnl_set_elems_iter_create(const struct nftnl_set *s)
806{
807 struct nftnl_set_elems_iter *iter;
808
809 iter = calloc(1, sizeof(struct nftnl_set_elems_iter));
810 if (iter == NULL)
811 return NULL;
812
813 iter->set = s;
814 iter->list = &s->element_list;
815 if (list_empty(&s->element_list))
816 iter->cur = NULL;
817 else
818 iter->cur = list_entry(s->element_list.next,
819 struct nftnl_set_elem, head);
820
821 return iter;
822}
823
824EXPORT_SYMBOL(nftnl_set_elems_iter_cur);
825struct nftnl_set_elem *
826nftnl_set_elems_iter_cur(const struct nftnl_set_elems_iter *iter)
827{
828 return iter->cur;
829}
830
831EXPORT_SYMBOL(nftnl_set_elems_iter_next);
832struct nftnl_set_elem *nftnl_set_elems_iter_next(struct nftnl_set_elems_iter *iter)
833{
834 struct nftnl_set_elem *s = iter->cur;
835
836 if (s == NULL)
837 return NULL;
838
839 iter->cur = list_entry(iter->cur->head.next, struct nftnl_set_elem, head);
840 if (&iter->cur->head == iter->list->next)
841 return NULL;
842
843 return s;
844}
845
846EXPORT_SYMBOL(nftnl_set_elems_iter_destroy);
847void nftnl_set_elems_iter_destroy(struct nftnl_set_elems_iter *iter)
848{
849 xfree(iter);
850}
851
852static bool nftnl_attr_nest_overflow(struct nlmsghdr *nlh,
853 const struct nlattr *from,
854 const struct nlattr *to)
855{
856 int len = (void *)to + to->nla_len - (void *)from;
857
858 /* The attribute length field is 16 bits long, thus the maximum payload
859 * that an attribute can convey is UINT16_MAX. In case of overflow,
860 * discard the last that did not fit into the attribute.
861 */
862 if (len > UINT16_MAX) {
863 nlh->nlmsg_len -= to->nla_len;
864 return true;
865 }
866 return false;
867}
868
869EXPORT_SYMBOL(nftnl_set_elems_nlmsg_build_payload_iter);
870int nftnl_set_elems_nlmsg_build_payload_iter(struct nlmsghdr *nlh,
871 struct nftnl_set_elems_iter *iter)
872{
873 struct nftnl_set_elem *elem;
874 struct nlattr *nest1, *nest2;
875 int i = 0, ret = 0;
876
877 nftnl_set_elem_nlmsg_build_def(nlh, iter->set);
878
879 /* This set is empty, don't add an empty list element nest. */
880 if (list_empty(&iter->set->element_list))
881 return ret;
882
883 nest1 = mnl_attr_nest_start(nlh, NFTA_SET_ELEM_LIST_ELEMENTS);
884 elem = nftnl_set_elems_iter_next(iter);
885 while (elem != NULL) {
886 nest2 = nftnl_set_elem_nlmsg_build(nlh, elem, ++i);
887 if (nftnl_attr_nest_overflow(nlh, nest1, nest2)) {
888 /* Go back to previous not to miss this element */
889 iter->cur = list_entry(iter->cur->head.prev,
890 struct nftnl_set_elem, head);
891 ret = 1;
892 break;
893 }
894 elem = nftnl_set_elems_iter_next(iter);
895 }
896 mnl_attr_nest_end(nlh, nest1);
897
898 return ret;
899}
nftnl_set_elems_iter
Definition set_elem.c:797
Generated by doxygen 1.15.0