libnftnl 1.2.9
table.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 <limits.h>
13#include <stdlib.h>
14#include <string.h>
15#include <netinet/in.h>
16#include <errno.h>
17
18#include <libmnl/libmnl.h>
19#include <linux/netfilter/nfnetlink.h>
20#include <linux/netfilter/nf_tables.h>
21
22#include <libnftnl/table.h>
23
25 struct list_head head;
26
27 const char *name;
28 uint32_t family;
29 uint32_t table_flags;
30 uint64_t handle;
31 uint32_t use;
32 uint32_t flags;
33 uint32_t owner;
34 struct {
35 void *data;
36 uint32_t len;
37 } user;
38};
39
40EXPORT_SYMBOL(nftnl_table_alloc);
41struct nftnl_table *nftnl_table_alloc(void)
42{
43 return calloc(1, sizeof(struct nftnl_table));
44}
45
46EXPORT_SYMBOL(nftnl_table_free);
47void nftnl_table_free(const struct nftnl_table *t)
48{
49 if (t->flags & (1 << NFTNL_TABLE_NAME))
50 xfree(t->name);
51 if (t->flags & (1 << NFTNL_TABLE_USERDATA))
52 xfree(t->user.data);
53
54 xfree(t);
55}
56
57EXPORT_SYMBOL(nftnl_table_is_set);
58bool nftnl_table_is_set(const struct nftnl_table *t, uint16_t attr)
59{
60 return t->flags & (1 << attr);
61}
62
63EXPORT_SYMBOL(nftnl_table_unset);
64void nftnl_table_unset(struct nftnl_table *t, uint16_t attr)
65{
66 if (!(t->flags & (1 << attr)))
67 return;
68
69 switch (attr) {
70 case NFTNL_TABLE_NAME:
71 xfree(t->name);
72 break;
73 case NFTNL_TABLE_USERDATA:
74 xfree(t->user.data);
75 break;
76 case NFTNL_TABLE_FLAGS:
77 case NFTNL_TABLE_HANDLE:
78 case NFTNL_TABLE_FAMILY:
79 case NFTNL_TABLE_USE:
80 case NFTNL_TABLE_OWNER:
81 break;
82 }
83 t->flags &= ~(1 << attr);
84}
85
86static uint32_t nftnl_table_validate[NFTNL_TABLE_MAX + 1] = {
87 [NFTNL_TABLE_FLAGS] = sizeof(uint32_t),
88 [NFTNL_TABLE_FAMILY] = sizeof(uint32_t),
89 [NFTNL_TABLE_HANDLE] = sizeof(uint64_t),
90 [NFTNL_TABLE_USE] = sizeof(uint32_t),
91 [NFTNL_TABLE_OWNER] = sizeof(uint32_t),
92};
93
94EXPORT_SYMBOL(nftnl_table_set_data);
95int nftnl_table_set_data(struct nftnl_table *t, uint16_t attr,
96 const void *data, uint32_t data_len)
97{
98 nftnl_assert_attr_exists(attr, NFTNL_TABLE_MAX);
99 nftnl_assert_validate(data, nftnl_table_validate, attr, data_len);
100
101 switch (attr) {
102 case NFTNL_TABLE_NAME:
103 return nftnl_set_str_attr(&t->name, &t->flags,
104 attr, data, data_len);
105 case NFTNL_TABLE_HANDLE:
106 memcpy(&t->handle, data, sizeof(t->handle));
107 break;
108 case NFTNL_TABLE_FLAGS:
109 memcpy(&t->table_flags, data, sizeof(t->table_flags));
110 break;
111 case NFTNL_TABLE_FAMILY:
112 memcpy(&t->family, data, sizeof(t->family));
113 break;
114 case NFTNL_TABLE_USE:
115 memcpy(&t->use, data, sizeof(t->use));
116 break;
117 case NFTNL_TABLE_USERDATA:
118 if (t->flags & (1 << NFTNL_TABLE_USERDATA))
119 xfree(t->user.data);
120
121 t->user.data = malloc(data_len);
122 if (!t->user.data)
123 return -1;
124 memcpy(t->user.data, data, data_len);
125 t->user.len = data_len;
126 break;
127 case NFTNL_TABLE_OWNER:
128 memcpy(&t->owner, data, sizeof(t->owner));
129 break;
130 }
131 t->flags |= (1 << attr);
132 return 0;
133}
134
135void nftnl_table_set(struct nftnl_table *t, uint16_t attr, const void *data) __visible;
136void nftnl_table_set(struct nftnl_table *t, uint16_t attr, const void *data)
137{
138 nftnl_table_set_data(t, attr, data, nftnl_table_validate[attr]);
139}
140
141EXPORT_SYMBOL(nftnl_table_set_u32);
142void nftnl_table_set_u32(struct nftnl_table *t, uint16_t attr, uint32_t val)
143{
144 nftnl_table_set_data(t, attr, &val, sizeof(uint32_t));
145}
146
147EXPORT_SYMBOL(nftnl_table_set_u64);
148void nftnl_table_set_u64(struct nftnl_table *t, uint16_t attr, uint64_t val)
149{
150 nftnl_table_set_data(t, attr, &val, sizeof(uint64_t));
151}
152
153EXPORT_SYMBOL(nftnl_table_set_u8);
154void nftnl_table_set_u8(struct nftnl_table *t, uint16_t attr, uint8_t val)
155{
156 nftnl_table_set_data(t, attr, &val, sizeof(uint8_t));
157}
158
159EXPORT_SYMBOL(nftnl_table_set_str);
160int nftnl_table_set_str(struct nftnl_table *t, uint16_t attr, const char *str)
161{
162 return nftnl_table_set_data(t, attr, str, strlen(str) + 1);
163}
164
165EXPORT_SYMBOL(nftnl_table_get_data);
166const void *nftnl_table_get_data(const struct nftnl_table *t, uint16_t attr,
167 uint32_t *data_len)
168{
169 if (!(t->flags & (1 << attr)))
170 return NULL;
171
172 switch(attr) {
173 case NFTNL_TABLE_NAME:
174 *data_len = strlen(t->name) + 1;
175 return t->name;
176 case NFTNL_TABLE_HANDLE:
177 *data_len = sizeof(uint64_t);
178 return &t->handle;
179 case NFTNL_TABLE_FLAGS:
180 *data_len = sizeof(uint32_t);
181 return &t->table_flags;
182 case NFTNL_TABLE_FAMILY:
183 *data_len = sizeof(uint32_t);
184 return &t->family;
185 case NFTNL_TABLE_USE:
186 *data_len = sizeof(uint32_t);
187 return &t->use;
188 case NFTNL_TABLE_USERDATA:
189 *data_len = t->user.len;
190 return t->user.data;
191 case NFTNL_TABLE_OWNER:
192 *data_len = sizeof(uint32_t);
193 return &t->owner;
194 }
195 return NULL;
196}
197
198EXPORT_SYMBOL(nftnl_table_get);
199const void *nftnl_table_get(const struct nftnl_table *t, uint16_t attr)
200{
201 uint32_t data_len;
202 return nftnl_table_get_data(t, attr, &data_len);
203}
204
205EXPORT_SYMBOL(nftnl_table_get_u32);
206uint32_t nftnl_table_get_u32(const struct nftnl_table *t, uint16_t attr)
207{
208 const void *ret = nftnl_table_get(t, attr);
209 return ret == NULL ? 0 : *((uint32_t *)ret);
210}
211
212EXPORT_SYMBOL(nftnl_table_get_u64);
213uint64_t nftnl_table_get_u64(const struct nftnl_table *t, uint16_t attr)
214{
215 const void *ret = nftnl_table_get(t, attr);
216 return ret == NULL ? 0 : *((uint64_t *)ret);
217}
218
219EXPORT_SYMBOL(nftnl_table_get_u8);
220uint8_t nftnl_table_get_u8(const struct nftnl_table *t, uint16_t attr)
221{
222 const void *ret = nftnl_table_get(t, attr);
223 return ret == NULL ? 0 : *((uint8_t *)ret);
224}
225
226EXPORT_SYMBOL(nftnl_table_get_str);
227const char *nftnl_table_get_str(const struct nftnl_table *t, uint16_t attr)
228{
229 return nftnl_table_get(t, attr);
230}
231
232EXPORT_SYMBOL(nftnl_table_nlmsg_build_payload);
233void nftnl_table_nlmsg_build_payload(struct nlmsghdr *nlh, const struct nftnl_table *t)
234{
235 if (t->flags & (1 << NFTNL_TABLE_NAME))
236 mnl_attr_put_strz(nlh, NFTA_TABLE_NAME, t->name);
237 if (t->flags & (1 << NFTNL_TABLE_HANDLE))
238 mnl_attr_put_u64(nlh, NFTA_TABLE_HANDLE, htobe64(t->handle));
239 if (t->flags & (1 << NFTNL_TABLE_FLAGS))
240 mnl_attr_put_u32(nlh, NFTA_TABLE_FLAGS, htonl(t->table_flags));
241 if (t->flags & (1 << NFTNL_TABLE_USERDATA))
242 mnl_attr_put(nlh, NFTA_TABLE_USERDATA, t->user.len, t->user.data);
243}
244
245static int nftnl_table_parse_attr_cb(const struct nlattr *attr, void *data)
246{
247 const struct nlattr **tb = data;
248 int type = mnl_attr_get_type(attr);
249
250 if (mnl_attr_type_valid(attr, NFTA_TABLE_MAX) < 0)
251 return MNL_CB_OK;
252
253 switch(type) {
254 case NFTA_TABLE_NAME:
255 if (mnl_attr_validate(attr, MNL_TYPE_STRING) < 0)
256 abi_breakage();
257 break;
258 case NFTA_TABLE_HANDLE:
259 if (mnl_attr_validate(attr, MNL_TYPE_U64) < 0)
260 abi_breakage();
261 break;
262 case NFTA_TABLE_FLAGS:
263 case NFTA_TABLE_USE:
264 case NFTA_TABLE_OWNER:
265 if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
266 abi_breakage();
267 break;
268 case NFTA_TABLE_USERDATA:
269 if (mnl_attr_validate(attr, MNL_TYPE_BINARY) < 0)
270 abi_breakage();
271 break;
272 }
273
274 tb[type] = attr;
275 return MNL_CB_OK;
276}
277
278EXPORT_SYMBOL(nftnl_table_nlmsg_parse);
279int nftnl_table_nlmsg_parse(const struct nlmsghdr *nlh, struct nftnl_table *t)
280{
281 struct nlattr *tb[NFTA_TABLE_MAX+1] = {};
282 struct nfgenmsg *nfg = mnl_nlmsg_get_payload(nlh);
283 int ret;
284
285 if (mnl_attr_parse(nlh, sizeof(*nfg), nftnl_table_parse_attr_cb, tb) < 0)
286 return -1;
287
288 if (tb[NFTA_TABLE_NAME]) {
289 if (t->flags & (1 << NFTNL_TABLE_NAME))
290 xfree(t->name);
291 t->name = strdup(mnl_attr_get_str(tb[NFTA_TABLE_NAME]));
292 if (!t->name)
293 return -1;
294 t->flags |= (1 << NFTNL_TABLE_NAME);
295 }
296 if (tb[NFTA_TABLE_FLAGS]) {
297 t->table_flags = ntohl(mnl_attr_get_u32(tb[NFTA_TABLE_FLAGS]));
298 t->flags |= (1 << NFTNL_TABLE_FLAGS);
299 }
300 if (tb[NFTA_TABLE_USE]) {
301 t->use = ntohl(mnl_attr_get_u32(tb[NFTA_TABLE_USE]));
302 t->flags |= (1 << NFTNL_TABLE_USE);
303 }
304 if (tb[NFTA_TABLE_HANDLE]) {
305 t->handle = be64toh(mnl_attr_get_u64(tb[NFTA_TABLE_HANDLE]));
306 t->flags |= (1 << NFTNL_TABLE_HANDLE);
307 }
308 if (tb[NFTA_TABLE_USERDATA]) {
309 ret = nftnl_table_set_data(t, NFTNL_TABLE_USERDATA,
310 mnl_attr_get_payload(tb[NFTA_TABLE_USERDATA]),
311 mnl_attr_get_payload_len(tb[NFTA_TABLE_USERDATA]));
312 if (ret < 0)
313 return ret;
314 }
315 if (tb[NFTA_TABLE_OWNER]) {
316 t->owner = ntohl(mnl_attr_get_u32(tb[NFTA_TABLE_OWNER]));
317 t->flags |= (1 << NFTNL_TABLE_OWNER);
318 }
319
320 t->family = nfg->nfgen_family;
321 t->flags |= (1 << NFTNL_TABLE_FAMILY);
322
323 return 0;
324}
325
326EXPORT_SYMBOL(nftnl_table_parse);
327int nftnl_table_parse(struct nftnl_table *t, enum nftnl_parse_type type,
328 const char *data, struct nftnl_parse_err *err)
329{
330 errno = EOPNOTSUPP;
331
332 return -1;
333}
334
335EXPORT_SYMBOL(nftnl_table_parse_file);
336int nftnl_table_parse_file(struct nftnl_table *t, enum nftnl_parse_type type,
337 FILE *fp, struct nftnl_parse_err *err)
338{
339 errno = EOPNOTSUPP;
340
341 return -1;
342}
343
344static int nftnl_table_snprintf_default(char *buf, size_t size,
345 const struct nftnl_table *t)
346{
347 return snprintf(buf, size, "table %s %s flags %x use %d handle %llu",
348 t->name, nftnl_family2str(t->family),
349 t->table_flags, t->use, (unsigned long long)t->handle);
350}
351
352static int nftnl_table_cmd_snprintf(char *buf, size_t remain,
353 const struct nftnl_table *t, uint32_t cmd,
354 uint32_t type, uint32_t flags)
355{
356 int ret, offset = 0;
357
358 if (type != NFTNL_OUTPUT_DEFAULT)
359 return -1;
360
361 ret = nftnl_table_snprintf_default(buf + offset, remain, t);
362 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
363 return offset;
364}
365
366EXPORT_SYMBOL(nftnl_table_snprintf);
367int nftnl_table_snprintf(char *buf, size_t size, const struct nftnl_table *t,
368 uint32_t type, uint32_t flags)
369{
370 if (size)
371 buf[0] = '\0';
372
373 return nftnl_table_cmd_snprintf(buf, size, t, nftnl_flag2cmd(flags), type,
374 flags);
375}
376
377static int nftnl_table_do_snprintf(char *buf, size_t size, const void *t,
378 uint32_t cmd, uint32_t type, uint32_t flags)
379{
380 return nftnl_table_snprintf(buf, size, t, type, flags);
381}
382
383EXPORT_SYMBOL(nftnl_table_fprintf);
384int nftnl_table_fprintf(FILE *fp, const struct nftnl_table *t, uint32_t type,
385 uint32_t flags)
386{
387 return nftnl_fprintf(fp, t, NFTNL_CMD_UNSPEC, type, flags,
388 nftnl_table_do_snprintf);
389}
390
392 struct list_head list;
393};
394
395EXPORT_SYMBOL(nftnl_table_list_alloc);
396struct nftnl_table_list *nftnl_table_list_alloc(void)
397{
398 struct nftnl_table_list *list;
399
400 list = calloc(1, sizeof(struct nftnl_table_list));
401 if (list == NULL)
402 return NULL;
403
404 INIT_LIST_HEAD(&list->list);
405
406 return list;
407}
408
409EXPORT_SYMBOL(nftnl_table_list_free);
410void nftnl_table_list_free(struct nftnl_table_list *list)
411{
412 struct nftnl_table *r, *tmp;
413
414 list_for_each_entry_safe(r, tmp, &list->list, head) {
415 list_del(&r->head);
416 nftnl_table_free(r);
417 }
418 xfree(list);
419}
420
421EXPORT_SYMBOL(nftnl_table_list_is_empty);
422int nftnl_table_list_is_empty(const struct nftnl_table_list *list)
423{
424 return list_empty(&list->list);
425}
426
427EXPORT_SYMBOL(nftnl_table_list_add);
428void nftnl_table_list_add(struct nftnl_table *r, struct nftnl_table_list *list)
429{
430 list_add(&r->head, &list->list);
431}
432
433EXPORT_SYMBOL(nftnl_table_list_add_tail);
434void nftnl_table_list_add_tail(struct nftnl_table *r, struct nftnl_table_list *list)
435{
436 list_add_tail(&r->head, &list->list);
437}
438
439EXPORT_SYMBOL(nftnl_table_list_del);
440void nftnl_table_list_del(struct nftnl_table *t)
441{
442 list_del(&t->head);
443}
444
445EXPORT_SYMBOL(nftnl_table_list_foreach);
446int nftnl_table_list_foreach(struct nftnl_table_list *table_list,
447 int (*cb)(struct nftnl_table *t, void *data),
448 void *data)
449{
450 struct nftnl_table *cur, *tmp;
451 int ret;
452
453 list_for_each_entry_safe(cur, tmp, &table_list->list, head) {
454 ret = cb(cur, data);
455 if (ret < 0)
456 return ret;
457 }
458 return 0;
459}
460
462 const struct nftnl_table_list *list;
463 struct nftnl_table *cur;
464};
465
466EXPORT_SYMBOL(nftnl_table_list_iter_create);
468nftnl_table_list_iter_create(const struct nftnl_table_list *l)
469{
470 struct nftnl_table_list_iter *iter;
471
472 iter = calloc(1, sizeof(struct nftnl_table_list_iter));
473 if (iter == NULL)
474 return NULL;
475
476 iter->list = l;
477 if (nftnl_table_list_is_empty(l))
478 iter->cur = NULL;
479 else
480 iter->cur = list_entry(l->list.next, struct nftnl_table, head);
481
482 return iter;
483}
484
485EXPORT_SYMBOL(nftnl_table_list_iter_next);
486struct nftnl_table *nftnl_table_list_iter_next(struct nftnl_table_list_iter *iter)
487{
488 struct nftnl_table *r = iter->cur;
489
490 if (r == NULL)
491 return NULL;
492
493 /* get next table, if any */
494 iter->cur = list_entry(iter->cur->head.next, struct nftnl_table, head);
495 if (&iter->cur->head == iter->list->list.next)
496 return NULL;
497
498 return r;
499}
500
501EXPORT_SYMBOL(nftnl_table_list_iter_destroy);
502void nftnl_table_list_iter_destroy(const struct nftnl_table_list_iter *iter)
503{
504 xfree(iter);
505}