libnftnl 1.3.1
chain.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 <limits.h>
14#include <string.h>
15#include <netinet/in.h>
16#include <errno.h>
17#include <inttypes.h>
18
19#include <libmnl/libmnl.h>
20#include <linux/netfilter/nfnetlink.h>
21#include <linux/netfilter/nf_tables.h>
22#include <linux/netfilter.h>
23#include <linux/netfilter_arp.h>
24
25#include <libnftnl/chain.h>
26#include <libnftnl/rule.h>
27
28struct nftnl_chain {
29 struct list_head head;
30 struct hlist_node hnode;
31
32 const char *name;
33 const char *type;
34 const char *table;
35 const char *dev;
36 struct nftnl_str_array dev_array;
37 uint32_t family;
38 uint32_t policy;
39 uint32_t hooknum;
40 int32_t prio;
41 uint32_t chain_flags;
42 uint32_t use;
43 uint64_t packets;
44 uint64_t bytes;
45 uint64_t handle;
46 uint32_t flags;
47 uint32_t chain_id;
48
49 struct {
50 void *data;
51 uint32_t len;
52 } user;
53
54 struct list_head rule_list;
55};
56
57static const char *nftnl_hooknum2str(int family, int hooknum)
58{
59 switch (family) {
60 case NFPROTO_IPV4:
61 case NFPROTO_IPV6:
62 case NFPROTO_INET:
63 case NFPROTO_BRIDGE:
64 switch (hooknum) {
65 case NF_INET_PRE_ROUTING:
66 return "prerouting";
67 case NF_INET_LOCAL_IN:
68 return "input";
69 case NF_INET_FORWARD:
70 return "forward";
71 case NF_INET_LOCAL_OUT:
72 return "output";
73 case NF_INET_POST_ROUTING:
74 return "postrouting";
75 }
76 break;
77 case NFPROTO_ARP:
78 switch (hooknum) {
79 case NF_ARP_IN:
80 return "input";
81 case NF_ARP_OUT:
82 return "output";
83 case NF_ARP_FORWARD:
84 return "forward";
85 }
86 break;
87 case NFPROTO_NETDEV:
88 switch (hooknum) {
89 case NF_NETDEV_INGRESS:
90 return "ingress";
91 }
92 break;
93 }
94 return "unknown";
95}
96
97EXPORT_SYMBOL(nftnl_chain_alloc);
98struct nftnl_chain *nftnl_chain_alloc(void)
99{
100 struct nftnl_chain *c;
101
102 c = calloc(1, sizeof(struct nftnl_chain));
103 if (c == NULL)
104 return NULL;
105
106 INIT_LIST_HEAD(&c->rule_list);
107
108 return c;
109}
110
111EXPORT_SYMBOL(nftnl_chain_free);
112void nftnl_chain_free(const struct nftnl_chain *c)
113{
114 struct nftnl_rule *r, *tmp;
115
116 list_for_each_entry_safe(r, tmp, &c->rule_list, head)
117 nftnl_rule_free(r);
118
119 if (c->flags & (1 << NFTNL_CHAIN_NAME))
120 xfree(c->name);
121 if (c->flags & (1 << NFTNL_CHAIN_TABLE))
122 xfree(c->table);
123 if (c->flags & (1 << NFTNL_CHAIN_TYPE))
124 xfree(c->type);
125 if (c->flags & (1 << NFTNL_CHAIN_DEV))
126 xfree(c->dev);
127 if (c->flags & (1 << NFTNL_CHAIN_USERDATA))
128 xfree(c->user.data);
129 if (c->flags & (1 << NFTNL_CHAIN_DEVICES))
130 nftnl_str_array_clear((struct nftnl_str_array *)&c->dev_array);
131 xfree(c);
132}
133
134EXPORT_SYMBOL(nftnl_chain_is_set);
135bool nftnl_chain_is_set(const struct nftnl_chain *c, uint16_t attr)
136{
137 return c->flags & (1 << attr);
138}
139
140EXPORT_SYMBOL(nftnl_chain_unset);
141void nftnl_chain_unset(struct nftnl_chain *c, uint16_t attr)
142{
143 if (!(c->flags & (1 << attr)))
144 return;
145
146 switch (attr) {
147 case NFTNL_CHAIN_NAME:
148 xfree(c->name);
149 break;
150 case NFTNL_CHAIN_TABLE:
151 xfree(c->table);
152 break;
153 case NFTNL_CHAIN_USE:
154 break;
155 case NFTNL_CHAIN_TYPE:
156 xfree(c->type);
157 break;
158 case NFTNL_CHAIN_HOOKNUM:
159 case NFTNL_CHAIN_PRIO:
160 case NFTNL_CHAIN_POLICY:
161 case NFTNL_CHAIN_BYTES:
162 case NFTNL_CHAIN_PACKETS:
163 case NFTNL_CHAIN_HANDLE:
164 case NFTNL_CHAIN_FAMILY:
165 case NFTNL_CHAIN_FLAGS:
166 case NFTNL_CHAIN_ID:
167 break;
168 case NFTNL_CHAIN_DEV:
169 xfree(c->dev);
170 break;
171 case NFTNL_CHAIN_DEVICES:
172 nftnl_str_array_clear(&c->dev_array);
173 break;
174 case NFTNL_CHAIN_USERDATA:
175 xfree(c->user.data);
176 break;
177 default:
178 return;
179 }
180
181 c->flags &= ~(1 << attr);
182}
183
184static uint32_t nftnl_chain_validate[NFTNL_CHAIN_MAX + 1] = {
185 [NFTNL_CHAIN_HOOKNUM] = sizeof(uint32_t),
186 [NFTNL_CHAIN_PRIO] = sizeof(int32_t),
187 [NFTNL_CHAIN_POLICY] = sizeof(uint32_t),
188 [NFTNL_CHAIN_USE] = sizeof(uint32_t),
189 [NFTNL_CHAIN_BYTES] = sizeof(uint64_t),
190 [NFTNL_CHAIN_PACKETS] = sizeof(uint64_t),
191 [NFTNL_CHAIN_HANDLE] = sizeof(uint64_t),
192 [NFTNL_CHAIN_FAMILY] = sizeof(uint32_t),
193 [NFTNL_CHAIN_FLAGS] = sizeof(uint32_t),
194 [NFTNL_CHAIN_ID] = sizeof(uint32_t),
195};
196
197EXPORT_SYMBOL(nftnl_chain_set_data);
198int nftnl_chain_set_data(struct nftnl_chain *c, uint16_t attr,
199 const void *data, uint32_t data_len)
200{
201 nftnl_assert_attr_exists(attr, NFTNL_CHAIN_MAX);
202 nftnl_assert_validate(data, nftnl_chain_validate, attr, data_len);
203
204 switch(attr) {
205 case NFTNL_CHAIN_NAME:
206 return nftnl_set_str_attr(&c->name, &c->flags,
207 attr, data, data_len);
208 case NFTNL_CHAIN_TABLE:
209 return nftnl_set_str_attr(&c->table, &c->flags,
210 attr, data, data_len);
211 case NFTNL_CHAIN_HOOKNUM:
212 memcpy(&c->hooknum, data, sizeof(c->hooknum));
213 break;
214 case NFTNL_CHAIN_PRIO:
215 memcpy(&c->prio, data, sizeof(c->prio));
216 break;
217 case NFTNL_CHAIN_POLICY:
218 memcpy(&c->policy, data, sizeof(c->policy));
219 break;
220 case NFTNL_CHAIN_USE:
221 memcpy(&c->use, data, sizeof(c->use));
222 break;
223 case NFTNL_CHAIN_BYTES:
224 memcpy(&c->bytes, data, sizeof(c->bytes));
225 break;
226 case NFTNL_CHAIN_PACKETS:
227 memcpy(&c->packets, data, sizeof(c->packets));
228 break;
229 case NFTNL_CHAIN_HANDLE:
230 memcpy(&c->handle, data, sizeof(c->handle));
231 break;
232 case NFTNL_CHAIN_FAMILY:
233 memcpy(&c->family, data, sizeof(c->family));
234 break;
235 case NFTNL_CHAIN_TYPE:
236 return nftnl_set_str_attr(&c->type, &c->flags,
237 attr, data, data_len);
238 case NFTNL_CHAIN_DEV:
239 return nftnl_set_str_attr(&c->dev, &c->flags,
240 attr, data, data_len);
241 case NFTNL_CHAIN_DEVICES:
242 if (nftnl_str_array_set(&c->dev_array, data) < 0)
243 return -1;
244 break;
245 case NFTNL_CHAIN_FLAGS:
246 memcpy(&c->chain_flags, data, sizeof(c->chain_flags));
247 break;
248 case NFTNL_CHAIN_ID:
249 memcpy(&c->chain_id, data, sizeof(c->chain_id));
250 break;
251 case NFTNL_CHAIN_USERDATA:
252 if (c->flags & (1 << NFTNL_CHAIN_USERDATA))
253 xfree(c->user.data);
254
255 c->user.data = malloc(data_len);
256 if (!c->user.data)
257 return -1;
258 memcpy(c->user.data, data, data_len);
259 c->user.len = data_len;
260 break;
261 }
262 c->flags |= (1 << attr);
263 return 0;
264}
265
266void nftnl_chain_set(struct nftnl_chain *c, uint16_t attr, const void *data) __visible;
267void nftnl_chain_set(struct nftnl_chain *c, uint16_t attr, const void *data)
268{
269 nftnl_chain_set_data(c, attr, data, nftnl_chain_validate[attr]);
270}
271
272EXPORT_SYMBOL(nftnl_chain_set_u32);
273void nftnl_chain_set_u32(struct nftnl_chain *c, uint16_t attr, uint32_t data)
274{
275 nftnl_chain_set_data(c, attr, &data, sizeof(uint32_t));
276}
277
278EXPORT_SYMBOL(nftnl_chain_set_s32);
279void nftnl_chain_set_s32(struct nftnl_chain *c, uint16_t attr, int32_t data)
280{
281 nftnl_chain_set_data(c, attr, &data, sizeof(int32_t));
282}
283
284EXPORT_SYMBOL(nftnl_chain_set_u64);
285void nftnl_chain_set_u64(struct nftnl_chain *c, uint16_t attr, uint64_t data)
286{
287 nftnl_chain_set_data(c, attr, &data, sizeof(uint64_t));
288}
289
290EXPORT_SYMBOL(nftnl_chain_set_u8);
291void nftnl_chain_set_u8(struct nftnl_chain *c, uint16_t attr, uint8_t data)
292{
293 nftnl_chain_set_data(c, attr, &data, sizeof(uint8_t));
294}
295
296EXPORT_SYMBOL(nftnl_chain_set_str);
297int nftnl_chain_set_str(struct nftnl_chain *c, uint16_t attr, const char *str)
298{
299 return nftnl_chain_set_data(c, attr, str, strlen(str) + 1);
300}
301
302EXPORT_SYMBOL(nftnl_chain_set_array);
303int nftnl_chain_set_array(struct nftnl_chain *c, uint16_t attr,
304 const char **data)
305{
306 return nftnl_chain_set_data(c, attr, data, 0);
307}
308
309EXPORT_SYMBOL(nftnl_chain_get_data);
310const void *nftnl_chain_get_data(const struct nftnl_chain *c, uint16_t attr,
311 uint32_t *data_len)
312{
313 if (!(c->flags & (1 << attr)))
314 return NULL;
315
316 switch(attr) {
317 case NFTNL_CHAIN_NAME:
318 *data_len = strlen(c->name) + 1;
319 return c->name;
320 case NFTNL_CHAIN_TABLE:
321 *data_len = strlen(c->table) + 1;
322 return c->table;
323 case NFTNL_CHAIN_HOOKNUM:
324 *data_len = sizeof(uint32_t);
325 return &c->hooknum;
326 case NFTNL_CHAIN_PRIO:
327 *data_len = sizeof(int32_t);
328 return &c->prio;
329 case NFTNL_CHAIN_POLICY:
330 *data_len = sizeof(uint32_t);
331 return &c->policy;
332 case NFTNL_CHAIN_USE:
333 *data_len = sizeof(uint32_t);
334 return &c->use;
335 case NFTNL_CHAIN_BYTES:
336 *data_len = sizeof(uint64_t);
337 return &c->bytes;
338 case NFTNL_CHAIN_PACKETS:
339 *data_len = sizeof(uint64_t);
340 return &c->packets;
341 case NFTNL_CHAIN_HANDLE:
342 *data_len = sizeof(uint64_t);
343 return &c->handle;
344 case NFTNL_CHAIN_FAMILY:
345 *data_len = sizeof(uint32_t);
346 return &c->family;
347 case NFTNL_CHAIN_TYPE:
348 *data_len = sizeof(uint32_t);
349 return c->type;
350 case NFTNL_CHAIN_DEV:
351 *data_len = strlen(c->dev) + 1;
352 return c->dev;
353 case NFTNL_CHAIN_DEVICES:
354 *data_len = 0;
355 return c->dev_array.array;
356 case NFTNL_CHAIN_FLAGS:
357 *data_len = sizeof(uint32_t);
358 return &c->chain_flags;
359 case NFTNL_CHAIN_ID:
360 *data_len = sizeof(uint32_t);
361 return &c->chain_id;
362 case NFTNL_CHAIN_USERDATA:
363 *data_len = c->user.len;
364 return c->user.data;
365 }
366 return NULL;
367}
368
369EXPORT_SYMBOL(nftnl_chain_get);
370const void *nftnl_chain_get(const struct nftnl_chain *c, uint16_t attr)
371{
372 uint32_t data_len;
373 return nftnl_chain_get_data(c, attr, &data_len);
374}
375
376EXPORT_SYMBOL(nftnl_chain_get_str);
377const char *nftnl_chain_get_str(const struct nftnl_chain *c, uint16_t attr)
378{
379 return nftnl_chain_get(c, attr);
380}
381
382EXPORT_SYMBOL(nftnl_chain_get_u32);
383uint32_t nftnl_chain_get_u32(const struct nftnl_chain *c, uint16_t attr)
384{
385 uint32_t data_len;
386 const uint32_t *val = nftnl_chain_get_data(c, attr, &data_len);
387
388 nftnl_assert(val, attr, data_len == sizeof(uint32_t));
389
390 return val ? *val : 0;
391}
392
393EXPORT_SYMBOL(nftnl_chain_get_s32);
394int32_t nftnl_chain_get_s32(const struct nftnl_chain *c, uint16_t attr)
395{
396 uint32_t data_len;
397 const int32_t *val = nftnl_chain_get_data(c, attr, &data_len);
398
399 nftnl_assert(val, attr, data_len == sizeof(int32_t));
400
401 return val ? *val : 0;
402}
403
404EXPORT_SYMBOL(nftnl_chain_get_u64);
405uint64_t nftnl_chain_get_u64(const struct nftnl_chain *c, uint16_t attr)
406{
407 uint32_t data_len;
408 const uint64_t *val = nftnl_chain_get_data(c, attr, &data_len);
409
410 nftnl_assert(val, attr, data_len == sizeof(int64_t));
411
412 return val ? *val : 0;
413}
414
415EXPORT_SYMBOL(nftnl_chain_get_u8);
416uint8_t nftnl_chain_get_u8(const struct nftnl_chain *c, uint16_t attr)
417{
418 uint32_t data_len;
419 const uint8_t *val = nftnl_chain_get_data(c, attr, &data_len);
420
421 nftnl_assert(val, attr, data_len == sizeof(int8_t));
422
423 return val ? *val : 0;
424}
425
426EXPORT_SYMBOL(nftnl_chain_get_array);
427const char *const *nftnl_chain_get_array(const struct nftnl_chain *c, uint16_t attr)
428{
429 uint32_t data_len;
430 const char * const *val = nftnl_chain_get_data(c, attr, &data_len);
431
432 nftnl_assert(val, attr, attr == NFTNL_CHAIN_DEVICES);
433
434 return val;
435}
436
437EXPORT_SYMBOL(nftnl_chain_nlmsg_build_payload);
438void nftnl_chain_nlmsg_build_payload(struct nlmsghdr *nlh, const struct nftnl_chain *c)
439{
440 struct nlattr *nest = NULL;
441 int i;
442
443 if (c->flags & (1 << NFTNL_CHAIN_TABLE))
444 mnl_attr_put_strz(nlh, NFTA_CHAIN_TABLE, c->table);
445 if (c->flags & (1 << NFTNL_CHAIN_NAME))
446 mnl_attr_put_strz(nlh, NFTA_CHAIN_NAME, c->name);
447
448 if ((c->flags & (1 << NFTNL_CHAIN_HOOKNUM)) ||
449 (c->flags & (1 << NFTNL_CHAIN_PRIO)) ||
450 (c->flags & (1 << NFTNL_CHAIN_DEV)) ||
451 (c->flags & (1 << NFTNL_CHAIN_DEVICES)))
452 nest = mnl_attr_nest_start(nlh, NFTA_CHAIN_HOOK);
453
454 if ((c->flags & (1 << NFTNL_CHAIN_HOOKNUM)))
455 mnl_attr_put_u32(nlh, NFTA_HOOK_HOOKNUM, htonl(c->hooknum));
456 if ((c->flags & (1 << NFTNL_CHAIN_PRIO)))
457 mnl_attr_put_u32(nlh, NFTA_HOOK_PRIORITY, htonl(c->prio));
458
459 if (c->flags & (1 << NFTNL_CHAIN_DEV))
460 mnl_attr_put_strz(nlh, NFTA_HOOK_DEV, c->dev);
461 else if (c->flags & (1 << NFTNL_CHAIN_DEVICES)) {
462 struct nlattr *nest_dev;
463 const char *dev;
464
465 nest_dev = mnl_attr_nest_start(nlh, NFTA_HOOK_DEVS);
466 nftnl_str_array_foreach(dev, &c->dev_array, i)
467 nftnl_attr_put_ifname(nlh, dev);
468 mnl_attr_nest_end(nlh, nest_dev);
469 }
470
471 if ((c->flags & (1 << NFTNL_CHAIN_HOOKNUM)) ||
472 (c->flags & (1 << NFTNL_CHAIN_PRIO)) ||
473 (c->flags & (1 << NFTNL_CHAIN_DEV)) ||
474 (c->flags & (1 << NFTNL_CHAIN_DEVICES)))
475 mnl_attr_nest_end(nlh, nest);
476
477 if (c->flags & (1 << NFTNL_CHAIN_POLICY))
478 mnl_attr_put_u32(nlh, NFTA_CHAIN_POLICY, htonl(c->policy));
479 if (c->flags & (1 << NFTNL_CHAIN_USE))
480 mnl_attr_put_u32(nlh, NFTA_CHAIN_USE, htonl(c->use));
481 if ((c->flags & (1 << NFTNL_CHAIN_PACKETS)) &&
482 (c->flags & (1 << NFTNL_CHAIN_BYTES))) {
483 nest = mnl_attr_nest_start(nlh, NFTA_CHAIN_COUNTERS);
484 mnl_attr_put_u64(nlh, NFTA_COUNTER_PACKETS, be64toh(c->packets));
485 mnl_attr_put_u64(nlh, NFTA_COUNTER_BYTES, be64toh(c->bytes));
486 mnl_attr_nest_end(nlh, nest);
487 }
488 if (c->flags & (1 << NFTNL_CHAIN_HANDLE))
489 mnl_attr_put_u64(nlh, NFTA_CHAIN_HANDLE, be64toh(c->handle));
490 if (c->flags & (1 << NFTNL_CHAIN_TYPE))
491 mnl_attr_put_strz(nlh, NFTA_CHAIN_TYPE, c->type);
492 if (c->flags & (1 << NFTNL_CHAIN_FLAGS))
493 mnl_attr_put_u32(nlh, NFTA_CHAIN_FLAGS, htonl(c->chain_flags));
494 if (c->flags & (1 << NFTNL_CHAIN_ID))
495 mnl_attr_put_u32(nlh, NFTA_CHAIN_ID, htonl(c->chain_id));
496 if (c->flags & (1 << NFTNL_CHAIN_USERDATA))
497 mnl_attr_put(nlh, NFTA_CHAIN_USERDATA, c->user.len, c->user.data);
498}
499
500EXPORT_SYMBOL(nftnl_chain_rule_add);
501void nftnl_chain_rule_add(struct nftnl_rule *rule, struct nftnl_chain *c)
502{
503 list_add(&rule->head, &c->rule_list);
504}
505
506EXPORT_SYMBOL(nftnl_chain_rule_del);
507void nftnl_chain_rule_del(struct nftnl_rule *r)
508{
509 list_del(&r->head);
510}
511
512EXPORT_SYMBOL(nftnl_chain_rule_add_tail);
513void nftnl_chain_rule_add_tail(struct nftnl_rule *rule, struct nftnl_chain *c)
514{
515 list_add_tail(&rule->head, &c->rule_list);
516}
517
518EXPORT_SYMBOL(nftnl_chain_rule_insert_at);
519void nftnl_chain_rule_insert_at(struct nftnl_rule *rule, struct nftnl_rule *pos)
520{
521 list_add_tail(&rule->head, &pos->head);
522}
523
524EXPORT_SYMBOL(nftnl_chain_rule_append_at);
525void nftnl_chain_rule_append_at(struct nftnl_rule *rule, struct nftnl_rule *pos)
526{
527 list_add(&rule->head, &pos->head);
528}
529
530static int nftnl_chain_parse_attr_cb(const struct nlattr *attr, void *data)
531{
532 const struct nlattr **tb = data;
533 int type = mnl_attr_get_type(attr);
534
535 if (mnl_attr_type_valid(attr, NFTA_CHAIN_MAX) < 0)
536 return MNL_CB_OK;
537
538 switch(type) {
539 case NFTA_CHAIN_NAME:
540 case NFTA_CHAIN_TABLE:
541 case NFTA_CHAIN_TYPE:
542 if (mnl_attr_validate(attr, MNL_TYPE_STRING) < 0)
543 abi_breakage();
544 break;
545 case NFTA_CHAIN_HOOK:
546 case NFTA_CHAIN_COUNTERS:
547 if (mnl_attr_validate(attr, MNL_TYPE_NESTED) < 0)
548 abi_breakage();
549 break;
550 case NFTA_CHAIN_POLICY:
551 case NFTA_CHAIN_USE:
552 case NFTA_CHAIN_FLAGS:
553 case NFTA_CHAIN_ID:
554 if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
555 abi_breakage();
556 break;
557 case NFTA_CHAIN_HANDLE:
558 if (mnl_attr_validate(attr, MNL_TYPE_U64) < 0)
559 abi_breakage();
560 break;
561 case NFTA_CHAIN_USERDATA:
562 if (mnl_attr_validate(attr, MNL_TYPE_BINARY) < 0)
563 abi_breakage();
564 break;
565 }
566
567 tb[type] = attr;
568 return MNL_CB_OK;
569}
570
571static int nftnl_chain_parse_counters_cb(const struct nlattr *attr, void *data)
572{
573 const struct nlattr **tb = data;
574 int type = mnl_attr_get_type(attr);
575
576 if (mnl_attr_type_valid(attr, NFTA_COUNTER_MAX) < 0)
577 return MNL_CB_OK;
578
579 switch(type) {
580 case NFTA_COUNTER_BYTES:
581 case NFTA_COUNTER_PACKETS:
582 if (mnl_attr_validate(attr, MNL_TYPE_U64) < 0)
583 abi_breakage();
584 break;
585 }
586
587 tb[type] = attr;
588 return MNL_CB_OK;
589}
590
591static int nftnl_chain_parse_counters(struct nlattr *attr, struct nftnl_chain *c)
592{
593 struct nlattr *tb[NFTA_COUNTER_MAX+1] = {};
594
595 if (mnl_attr_parse_nested(attr, nftnl_chain_parse_counters_cb, tb) < 0)
596 return -1;
597
598 if (tb[NFTA_COUNTER_PACKETS]) {
599 c->packets = be64toh(mnl_attr_get_u64(tb[NFTA_COUNTER_PACKETS]));
600 c->flags |= (1 << NFTNL_CHAIN_PACKETS);
601 }
602 if (tb[NFTA_COUNTER_BYTES]) {
603 c->bytes = be64toh(mnl_attr_get_u64(tb[NFTA_COUNTER_BYTES]));
604 c->flags |= (1 << NFTNL_CHAIN_BYTES);
605 }
606
607 return 0;
608}
609
610static int nftnl_chain_parse_hook_cb(const struct nlattr *attr, void *data)
611{
612 const struct nlattr **tb = data;
613 int type = mnl_attr_get_type(attr);
614
615 if (mnl_attr_type_valid(attr, NFTA_HOOK_MAX) < 0)
616 return MNL_CB_OK;
617
618 switch(type) {
619 case NFTA_HOOK_HOOKNUM:
620 case NFTA_HOOK_PRIORITY:
621 if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
622 abi_breakage();
623 break;
624 case NFTA_HOOK_DEV:
625 if (mnl_attr_validate(attr, MNL_TYPE_STRING) < 0)
626 abi_breakage();
627 break;
628 }
629
630 tb[type] = attr;
631 return MNL_CB_OK;
632}
633
634static int nftnl_chain_parse_hook(struct nlattr *attr, struct nftnl_chain *c)
635{
636 struct nlattr *tb[NFTA_HOOK_MAX+1] = {};
637 int ret;
638
639 if (mnl_attr_parse_nested(attr, nftnl_chain_parse_hook_cb, tb) < 0)
640 return -1;
641
642 if (tb[NFTA_HOOK_HOOKNUM]) {
643 c->hooknum = ntohl(mnl_attr_get_u32(tb[NFTA_HOOK_HOOKNUM]));
644 c->flags |= (1 << NFTNL_CHAIN_HOOKNUM);
645 }
646 if (tb[NFTA_HOOK_PRIORITY]) {
647 c->prio = ntohl(mnl_attr_get_u32(tb[NFTA_HOOK_PRIORITY]));
648 c->flags |= (1 << NFTNL_CHAIN_PRIO);
649 }
650 if (tb[NFTA_HOOK_DEV]) {
651 if (c->flags & (1 << NFTNL_CHAIN_DEV))
652 xfree(c->dev);
653 c->dev = strdup(mnl_attr_get_str(tb[NFTA_HOOK_DEV]));
654 if (!c->dev)
655 return -1;
656 c->flags |= (1 << NFTNL_CHAIN_DEV);
657 }
658 if (tb[NFTA_HOOK_DEVS]) {
659 ret = nftnl_parse_devs(&c->dev_array, tb[NFTA_HOOK_DEVS]);
660 if (ret < 0)
661 return -1;
662 c->flags |= (1 << NFTNL_CHAIN_DEVICES);
663 }
664
665 return 0;
666}
667
668EXPORT_SYMBOL(nftnl_chain_nlmsg_parse);
669int nftnl_chain_nlmsg_parse(const struct nlmsghdr *nlh, struct nftnl_chain *c)
670{
671 struct nlattr *tb[NFTA_CHAIN_MAX+1] = {};
672 struct nfgenmsg *nfg = mnl_nlmsg_get_payload(nlh);
673 int ret = 0;
674
675 if (mnl_attr_parse(nlh, sizeof(*nfg), nftnl_chain_parse_attr_cb, tb) < 0)
676 return -1;
677
678 if (nftnl_parse_str_attr(tb[NFTA_CHAIN_NAME], NFTNL_CHAIN_NAME,
679 &c->name, &c->flags) < 0)
680 return -1;
681 if (nftnl_parse_str_attr(tb[NFTA_CHAIN_TABLE], NFTNL_CHAIN_TABLE,
682 &c->table, &c->flags) < 0)
683 return -1;
684 if (tb[NFTA_CHAIN_HOOK]) {
685 ret = nftnl_chain_parse_hook(tb[NFTA_CHAIN_HOOK], c);
686 if (ret < 0)
687 return ret;
688 }
689 if (tb[NFTA_CHAIN_POLICY]) {
690 c->policy = ntohl(mnl_attr_get_u32(tb[NFTA_CHAIN_POLICY]));
691 c->flags |= (1 << NFTNL_CHAIN_POLICY);
692 }
693 if (tb[NFTA_CHAIN_USE]) {
694 c->use = ntohl(mnl_attr_get_u32(tb[NFTA_CHAIN_USE]));
695 c->flags |= (1 << NFTNL_CHAIN_USE);
696 }
697 if (tb[NFTA_CHAIN_COUNTERS]) {
698 ret = nftnl_chain_parse_counters(tb[NFTA_CHAIN_COUNTERS], c);
699 if (ret < 0)
700 return ret;
701 }
702 if (tb[NFTA_CHAIN_HANDLE]) {
703 c->handle = be64toh(mnl_attr_get_u64(tb[NFTA_CHAIN_HANDLE]));
704 c->flags |= (1 << NFTNL_CHAIN_HANDLE);
705 }
706 if (nftnl_parse_str_attr(tb[NFTA_CHAIN_TYPE], NFTNL_CHAIN_TYPE,
707 &c->type, &c->flags) < 0)
708 return -1;
709 if (tb[NFTA_CHAIN_FLAGS]) {
710 c->chain_flags = ntohl(mnl_attr_get_u32(tb[NFTA_CHAIN_FLAGS]));
711 c->flags |= (1 << NFTNL_CHAIN_FLAGS);
712 }
713 if (tb[NFTA_CHAIN_ID]) {
714 c->chain_id = ntohl(mnl_attr_get_u32(tb[NFTA_CHAIN_ID]));
715 c->flags |= (1 << NFTNL_CHAIN_ID);
716 }
717 if (tb[NFTA_CHAIN_USERDATA]) {
718 nftnl_chain_set_data(c, NFTNL_CHAIN_USERDATA,
719 mnl_attr_get_payload(tb[NFTA_CHAIN_USERDATA]),
720 mnl_attr_get_payload_len(tb[NFTA_CHAIN_USERDATA]));
721 }
722
723 c->family = nfg->nfgen_family;
724 c->flags |= (1 << NFTNL_CHAIN_FAMILY);
725
726 return ret;
727}
728
729static int nftnl_chain_snprintf_default(char *buf, size_t remain,
730 const struct nftnl_chain *c)
731{
732 int ret, offset = 0, i;
733 const char *dev;
734
735 ret = snprintf(buf, remain, "%s %s %s use %u",
736 nftnl_family2str(c->family), c->table, c->name, c->use);
737 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
738
739 if (c->flags & (1 << NFTNL_CHAIN_HOOKNUM)) {
740 ret = snprintf(buf + offset, remain, " type %s hook %s prio %d",
741 c->type, nftnl_hooknum2str(c->family, c->hooknum),
742 c->prio);
743 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
744
745 if (c->flags & (1 << NFTNL_CHAIN_POLICY)) {
746 ret = snprintf(buf + offset, remain, " policy %s",
747 nftnl_verdict2str(c->policy));
748 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
749 }
750
751 ret = snprintf(buf + offset, remain,
752 " packets %"PRIu64" bytes %"PRIu64"",
753 c->packets, c->bytes);
754 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
755
756 if (c->flags & (1 << NFTNL_CHAIN_DEV)) {
757 ret = snprintf(buf + offset, remain, " dev %s ",
758 c->dev);
759 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
760 }
761 if (c->flags & (1 << NFTNL_CHAIN_DEVICES)) {
762 ret = snprintf(buf + offset, remain, " dev { ");
763 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
764
765 nftnl_str_array_foreach(dev, &c->dev_array, i) {
766 ret = snprintf(buf + offset, remain, " %s ",
767 dev);
768 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
769 }
770 ret = snprintf(buf + offset, remain, " } ");
771 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
772 }
773 if (c->flags & (1 << NFTNL_CHAIN_FLAGS)) {
774 ret = snprintf(buf + offset, remain, " flags %x",
775 c->chain_flags);
776 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
777 }
778 if (c->flags & (1 << NFTNL_CHAIN_ID)) {
779 ret = snprintf(buf + offset, remain, " id %x",
780 c->chain_id);
781 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
782 }
783 }
784
785 return offset;
786}
787
788static int nftnl_chain_cmd_snprintf(char *buf, size_t remain,
789 const struct nftnl_chain *c, uint32_t cmd,
790 uint32_t type, uint32_t flags)
791{
792 int ret, offset = 0;
793
794 if (type != NFTNL_OUTPUT_DEFAULT)
795 return -1;
796
797 ret = nftnl_chain_snprintf_default(buf + offset, remain, c);
798 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
799 return offset;
800}
801
802EXPORT_SYMBOL(nftnl_chain_snprintf);
803int nftnl_chain_snprintf(char *buf, size_t size, const struct nftnl_chain *c,
804 uint32_t type, uint32_t flags)
805{
806 if (size)
807 buf[0] = '\0';
808
809 return nftnl_chain_cmd_snprintf(buf, size, c, nftnl_flag2cmd(flags),
810 type, flags);
811}
812
813static int nftnl_chain_do_snprintf(char *buf, size_t size, const void *c,
814 uint32_t cmd, uint32_t type, uint32_t flags)
815{
816 return nftnl_chain_snprintf(buf, size, c, type, flags);
817}
818
819EXPORT_SYMBOL(nftnl_chain_fprintf);
820int nftnl_chain_fprintf(FILE *fp, const struct nftnl_chain *c, uint32_t type,
821 uint32_t flags)
822{
823 return nftnl_fprintf(fp, c, NFTNL_CMD_UNSPEC, type, flags,
824 nftnl_chain_do_snprintf);
825}
826
827EXPORT_SYMBOL(nftnl_rule_foreach);
828int nftnl_rule_foreach(struct nftnl_chain *c,
829 int (*cb)(struct nftnl_rule *r, void *data),
830 void *data)
831{
832 struct nftnl_rule *cur, *tmp;
833 int ret;
834
835 list_for_each_entry_safe(cur, tmp, &c->rule_list, head) {
836 ret = cb(cur, data);
837 if (ret < 0)
838 return ret;
839 }
840 return 0;
841}
842
843EXPORT_SYMBOL(nftnl_rule_lookup_byindex);
844struct nftnl_rule *
845nftnl_rule_lookup_byindex(struct nftnl_chain *c, uint32_t index)
846{
847 struct nftnl_rule *r;
848
849 list_for_each_entry(r, &c->rule_list, head) {
850 if (!index)
851 return r;
852 index--;
853 }
854 return NULL;
855}
856
857struct nftnl_rule_iter {
858 const struct nftnl_chain *c;
859 struct nftnl_rule *cur;
860};
861
862static void nftnl_rule_iter_init(const struct nftnl_chain *c,
863 struct nftnl_rule_iter *iter)
864{
865 iter->c = c;
866 if (list_empty(&c->rule_list))
867 iter->cur = NULL;
868 else
869 iter->cur = list_entry(c->rule_list.next, struct nftnl_rule,
870 head);
871}
872
873EXPORT_SYMBOL(nftnl_rule_iter_create);
874struct nftnl_rule_iter *nftnl_rule_iter_create(const struct nftnl_chain *c)
875{
876 struct nftnl_rule_iter *iter;
877
878 iter = calloc(1, sizeof(struct nftnl_rule_iter));
879 if (iter == NULL)
880 return NULL;
881
882 nftnl_rule_iter_init(c, iter);
883
884 return iter;
885}
886
887EXPORT_SYMBOL(nftnl_rule_iter_next);
888struct nftnl_rule *nftnl_rule_iter_next(struct nftnl_rule_iter *iter)
889{
890 struct nftnl_rule *rule = iter->cur;
891
892 if (rule == NULL)
893 return NULL;
894
895 /* get next rule, if any */
896 iter->cur = list_entry(iter->cur->head.next, struct nftnl_rule, head);
897 if (&iter->cur->head == iter->c->rule_list.next)
898 return NULL;
899
900 return rule;
901}
902
903EXPORT_SYMBOL(nftnl_rule_iter_destroy);
904void nftnl_rule_iter_destroy(struct nftnl_rule_iter *iter)
905{
906 xfree(iter);
907}
908
909#define CHAIN_NAME_HSIZE 512
910
911struct nftnl_chain_list {
912
913 struct list_head list;
914 struct hlist_head name_hash[CHAIN_NAME_HSIZE];
915};
916
917EXPORT_SYMBOL(nftnl_chain_list_alloc);
918struct nftnl_chain_list *nftnl_chain_list_alloc(void)
919{
920 struct nftnl_chain_list *list;
921 int i;
922
923 list = calloc(1, sizeof(struct nftnl_chain_list));
924 if (list == NULL)
925 return NULL;
926
927 INIT_LIST_HEAD(&list->list);
928 for (i = 0; i < CHAIN_NAME_HSIZE; i++)
929 INIT_HLIST_HEAD(&list->name_hash[i]);
930
931 return list;
932}
933
934EXPORT_SYMBOL(nftnl_chain_list_free);
935void nftnl_chain_list_free(struct nftnl_chain_list *list)
936{
937 struct nftnl_chain *r, *tmp;
938
939 list_for_each_entry_safe(r, tmp, &list->list, head) {
940 list_del(&r->head);
941 hlist_del(&r->hnode);
942 nftnl_chain_free(r);
943 }
944 xfree(list);
945}
946
947EXPORT_SYMBOL(nftnl_chain_list_is_empty);
948int nftnl_chain_list_is_empty(const struct nftnl_chain_list *list)
949{
950 return list_empty(&list->list);
951}
952
953static uint32_t djb_hash(const char *key)
954{
955 uint32_t i, hash = 5381;
956
957 for (i = 0; i < strlen(key); i++)
958 hash = ((hash << 5) + hash) + key[i];
959
960 return hash;
961}
962
963EXPORT_SYMBOL(nftnl_chain_list_add);
964void nftnl_chain_list_add(struct nftnl_chain *r, struct nftnl_chain_list *list)
965{
966 int key = djb_hash(r->name) % CHAIN_NAME_HSIZE;
967
968 hlist_add_head(&r->hnode, &list->name_hash[key]);
969 list_add(&r->head, &list->list);
970}
971
972EXPORT_SYMBOL(nftnl_chain_list_add_tail);
973void nftnl_chain_list_add_tail(struct nftnl_chain *r, struct nftnl_chain_list *list)
974{
975 int key = djb_hash(r->name) % CHAIN_NAME_HSIZE;
976
977 hlist_add_head(&r->hnode, &list->name_hash[key]);
978 list_add_tail(&r->head, &list->list);
979}
980
981EXPORT_SYMBOL(nftnl_chain_list_del);
982void nftnl_chain_list_del(struct nftnl_chain *r)
983{
984 list_del(&r->head);
985 hlist_del(&r->hnode);
986}
987
988EXPORT_SYMBOL(nftnl_chain_list_foreach);
989int nftnl_chain_list_foreach(struct nftnl_chain_list *chain_list,
990 int (*cb)(struct nftnl_chain *r, void *data),
991 void *data)
992{
993 struct nftnl_chain *cur, *tmp;
994 int ret;
995
996 list_for_each_entry_safe(cur, tmp, &chain_list->list, head) {
997 ret = cb(cur, data);
998 if (ret < 0)
999 return ret;
1000 }
1001 return 0;
1002}
1003
1004EXPORT_SYMBOL(nftnl_chain_list_lookup_byname);
1005struct nftnl_chain *
1006nftnl_chain_list_lookup_byname(struct nftnl_chain_list *chain_list,
1007 const char *chain)
1008{
1009 int key = djb_hash(chain) % CHAIN_NAME_HSIZE;
1010 struct nftnl_chain *c;
1011 struct hlist_node *n;
1012
1013 hlist_for_each_entry(c, n, &chain_list->name_hash[key], hnode) {
1014 if (!strcmp(chain, c->name))
1015 return c;
1016 }
1017 return NULL;
1018}
1019
1020struct nftnl_chain_list_iter {
1021 const struct nftnl_chain_list *list;
1022 struct nftnl_chain *cur;
1023};
1024
1025EXPORT_SYMBOL(nftnl_chain_list_iter_create);
1026struct nftnl_chain_list_iter *
1027nftnl_chain_list_iter_create(const struct nftnl_chain_list *l)
1028{
1029 struct nftnl_chain_list_iter *iter;
1030
1031 iter = calloc(1, sizeof(struct nftnl_chain_list_iter));
1032 if (iter == NULL)
1033 return NULL;
1034
1035 iter->list = l;
1036 if (nftnl_chain_list_is_empty(l))
1037 iter->cur = NULL;
1038 else
1039 iter->cur = list_entry(l->list.next, struct nftnl_chain, head);
1040
1041 return iter;
1042}
1043
1044EXPORT_SYMBOL(nftnl_chain_list_iter_next);
1045struct nftnl_chain *nftnl_chain_list_iter_next(struct nftnl_chain_list_iter *iter)
1046{
1047 struct nftnl_chain *r = iter->cur;
1048
1049 if (r == NULL)
1050 return NULL;
1051
1052 /* get next chain, if any */
1053 iter->cur = list_entry(iter->cur->head.next, struct nftnl_chain, head);
1054 if (&iter->cur->head == iter->list->list.next)
1055 return NULL;
1056
1057 return r;
1058}
1059
1060EXPORT_SYMBOL(nftnl_chain_list_iter_destroy);
1061void nftnl_chain_list_iter_destroy(struct nftnl_chain_list_iter *iter)
1062{
1063 xfree(iter);
1064}
nftnl_chain_list_iter
Definition chain.c:1020
nftnl_chain_list
Definition chain.c:911
nftnl_chain
Definition chain.c:28
nftnl_rule_iter
Definition chain.c:857
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