libnftnl 1.2.6
chain.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 <limits.h>
18#include <string.h>
19#include <netinet/in.h>
20#include <errno.h>
21#include <inttypes.h>
22
23#include <libmnl/libmnl.h>
24#include <linux/netfilter/nfnetlink.h>
25#include <linux/netfilter/nf_tables.h>
26#include <linux/netfilter.h>
27#include <linux/netfilter_arp.h>
28
29#include <libnftnl/chain.h>
30#include <libnftnl/rule.h>
31
33 struct list_head head;
34 struct hlist_node hnode;
35
36 const char *name;
37 const char *type;
38 const char *table;
39 const char *dev;
40 const char **dev_array;
41 int dev_array_len;
42 uint32_t family;
43 uint32_t policy;
44 uint32_t hooknum;
45 int32_t prio;
46 uint32_t chain_flags;
47 uint32_t use;
48 uint64_t packets;
49 uint64_t bytes;
50 uint64_t handle;
51 uint32_t flags;
52 uint32_t chain_id;
53
54 struct {
55 void *data;
56 uint32_t len;
57 } user;
58
59 struct list_head rule_list;
60};
61
62static const char *nftnl_hooknum2str(int family, int hooknum)
63{
64 switch (family) {
65 case NFPROTO_IPV4:
66 case NFPROTO_IPV6:
67 case NFPROTO_INET:
68 case NFPROTO_BRIDGE:
69 switch (hooknum) {
70 case NF_INET_PRE_ROUTING:
71 return "prerouting";
72 case NF_INET_LOCAL_IN:
73 return "input";
74 case NF_INET_FORWARD:
75 return "forward";
76 case NF_INET_LOCAL_OUT:
77 return "output";
78 case NF_INET_POST_ROUTING:
79 return "postrouting";
80 }
81 break;
82 case NFPROTO_ARP:
83 switch (hooknum) {
84 case NF_ARP_IN:
85 return "input";
86 case NF_ARP_OUT:
87 return "output";
88 case NF_ARP_FORWARD:
89 return "forward";
90 }
91 break;
92 case NFPROTO_NETDEV:
93 switch (hooknum) {
94 case NF_NETDEV_INGRESS:
95 return "ingress";
96 }
97 break;
98 }
99 return "unknown";
100}
101
102EXPORT_SYMBOL(nftnl_chain_alloc);
103struct nftnl_chain *nftnl_chain_alloc(void)
104{
105 struct nftnl_chain *c;
106
107 c = calloc(1, sizeof(struct nftnl_chain));
108 if (c == NULL)
109 return NULL;
110
111 INIT_LIST_HEAD(&c->rule_list);
112
113 return c;
114}
115
116EXPORT_SYMBOL(nftnl_chain_free);
117void nftnl_chain_free(const struct nftnl_chain *c)
118{
119 struct nftnl_rule *r, *tmp;
120 int i;
121
122 list_for_each_entry_safe(r, tmp, &c->rule_list, head)
123 nftnl_rule_free(r);
124
125 if (c->flags & (1 << NFTNL_CHAIN_NAME))
126 xfree(c->name);
127 if (c->flags & (1 << NFTNL_CHAIN_TABLE))
128 xfree(c->table);
129 if (c->flags & (1 << NFTNL_CHAIN_TYPE))
130 xfree(c->type);
131 if (c->flags & (1 << NFTNL_CHAIN_DEV))
132 xfree(c->dev);
133 if (c->flags & (1 << NFTNL_CHAIN_USERDATA))
134 xfree(c->user.data);
135 if (c->flags & (1 << NFTNL_CHAIN_DEVICES)) {
136 for (i = 0; i < c->dev_array_len; i++)
137 xfree(c->dev_array[i]);
138
139 xfree(c->dev_array);
140 }
141 xfree(c);
142}
143
144EXPORT_SYMBOL(nftnl_chain_is_set);
145bool nftnl_chain_is_set(const struct nftnl_chain *c, uint16_t attr)
146{
147 return c->flags & (1 << attr);
148}
149
150EXPORT_SYMBOL(nftnl_chain_unset);
151void nftnl_chain_unset(struct nftnl_chain *c, uint16_t attr)
152{
153 int i;
154
155 if (!(c->flags & (1 << attr)))
156 return;
157
158 switch (attr) {
159 case NFTNL_CHAIN_NAME:
160 xfree(c->name);
161 break;
162 case NFTNL_CHAIN_TABLE:
163 xfree(c->table);
164 break;
165 case NFTNL_CHAIN_USE:
166 break;
167 case NFTNL_CHAIN_TYPE:
168 xfree(c->type);
169 break;
170 case NFTNL_CHAIN_HOOKNUM:
171 case NFTNL_CHAIN_PRIO:
172 case NFTNL_CHAIN_POLICY:
173 case NFTNL_CHAIN_BYTES:
174 case NFTNL_CHAIN_PACKETS:
175 case NFTNL_CHAIN_HANDLE:
176 case NFTNL_CHAIN_FAMILY:
177 case NFTNL_CHAIN_FLAGS:
178 case NFTNL_CHAIN_ID:
179 break;
180 case NFTNL_CHAIN_DEV:
181 xfree(c->dev);
182 break;
183 case NFTNL_CHAIN_DEVICES:
184 for (i = 0; i < c->dev_array_len; i++)
185 xfree(c->dev_array[i]);
186 xfree(c->dev_array);
187 break;
188 default:
189 return;
190 }
191
192 c->flags &= ~(1 << attr);
193}
194
195static uint32_t nftnl_chain_validate[NFTNL_CHAIN_MAX + 1] = {
196 [NFTNL_CHAIN_HOOKNUM] = sizeof(uint32_t),
197 [NFTNL_CHAIN_PRIO] = sizeof(int32_t),
198 [NFTNL_CHAIN_POLICY] = sizeof(uint32_t),
199 [NFTNL_CHAIN_BYTES] = sizeof(uint64_t),
200 [NFTNL_CHAIN_PACKETS] = sizeof(uint64_t),
201 [NFTNL_CHAIN_HANDLE] = sizeof(uint64_t),
202 [NFTNL_CHAIN_FAMILY] = sizeof(uint32_t),
203 [NFTNL_CHAIN_FLAGS] = sizeof(uint32_t),
204 [NFTNL_CHAIN_ID] = sizeof(uint32_t),
205};
206
207EXPORT_SYMBOL(nftnl_chain_set_data);
208int nftnl_chain_set_data(struct nftnl_chain *c, uint16_t attr,
209 const void *data, uint32_t data_len)
210{
211 const char **dev_array;
212 int len = 0, i;
213
214 nftnl_assert_attr_exists(attr, NFTNL_CHAIN_MAX);
215 nftnl_assert_validate(data, nftnl_chain_validate, attr, data_len);
216
217 switch(attr) {
218 case NFTNL_CHAIN_NAME:
219 if (c->flags & (1 << NFTNL_CHAIN_NAME))
220 xfree(c->name);
221
222 c->name = strdup(data);
223 if (!c->name)
224 return -1;
225 break;
226 case NFTNL_CHAIN_TABLE:
227 if (c->flags & (1 << NFTNL_CHAIN_TABLE))
228 xfree(c->table);
229
230 c->table = strdup(data);
231 if (!c->table)
232 return -1;
233 break;
234 case NFTNL_CHAIN_HOOKNUM:
235 memcpy(&c->hooknum, data, sizeof(c->hooknum));
236 break;
237 case NFTNL_CHAIN_PRIO:
238 memcpy(&c->prio, data, sizeof(c->prio));
239 break;
240 case NFTNL_CHAIN_POLICY:
241 memcpy(&c->policy, data, sizeof(c->policy));
242 break;
243 case NFTNL_CHAIN_USE:
244 memcpy(&c->use, data, sizeof(c->use));
245 break;
246 case NFTNL_CHAIN_BYTES:
247 memcpy(&c->bytes, data, sizeof(c->bytes));
248 break;
249 case NFTNL_CHAIN_PACKETS:
250 memcpy(&c->packets, data, sizeof(c->packets));
251 break;
252 case NFTNL_CHAIN_HANDLE:
253 memcpy(&c->handle, data, sizeof(c->handle));
254 break;
255 case NFTNL_CHAIN_FAMILY:
256 memcpy(&c->family, data, sizeof(c->family));
257 break;
258 case NFTNL_CHAIN_TYPE:
259 if (c->flags & (1 << NFTNL_CHAIN_TYPE))
260 xfree(c->type);
261
262 c->type = strdup(data);
263 if (!c->type)
264 return -1;
265 break;
266 case NFTNL_CHAIN_DEV:
267 if (c->flags & (1 << NFTNL_CHAIN_DEV))
268 xfree(c->dev);
269
270 c->dev = strdup(data);
271 if (!c->dev)
272 return -1;
273 break;
274 case NFTNL_CHAIN_DEVICES:
275 dev_array = (const char **)data;
276 while (dev_array[len] != NULL)
277 len++;
278
279 if (c->flags & (1 << NFTNL_CHAIN_DEVICES)) {
280 for (i = 0; i < c->dev_array_len; i++)
281 xfree(c->dev_array[i]);
282 xfree(c->dev_array);
283 }
284
285 c->dev_array = calloc(len + 1, sizeof(char *));
286 if (!c->dev_array)
287 return -1;
288
289 for (i = 0; i < len; i++)
290 c->dev_array[i] = strdup(dev_array[i]);
291
292 c->dev_array_len = len;
293 break;
294 case NFTNL_CHAIN_FLAGS:
295 memcpy(&c->chain_flags, data, sizeof(c->chain_flags));
296 break;
297 case NFTNL_CHAIN_ID:
298 memcpy(&c->chain_id, data, sizeof(c->chain_id));
299 break;
300 case NFTNL_CHAIN_USERDATA:
301 if (c->flags & (1 << NFTNL_CHAIN_USERDATA))
302 xfree(c->user.data);
303
304 c->user.data = malloc(data_len);
305 if (!c->user.data)
306 return -1;
307 memcpy(c->user.data, data, data_len);
308 c->user.len = data_len;
309 break;
310 }
311 c->flags |= (1 << attr);
312 return 0;
313}
314
315void nftnl_chain_set(struct nftnl_chain *c, uint16_t attr, const void *data) __visible;
316void nftnl_chain_set(struct nftnl_chain *c, uint16_t attr, const void *data)
317{
318 nftnl_chain_set_data(c, attr, data, nftnl_chain_validate[attr]);
319}
320
321EXPORT_SYMBOL(nftnl_chain_set_u32);
322void nftnl_chain_set_u32(struct nftnl_chain *c, uint16_t attr, uint32_t data)
323{
324 nftnl_chain_set_data(c, attr, &data, sizeof(uint32_t));
325}
326
327EXPORT_SYMBOL(nftnl_chain_set_s32);
328void nftnl_chain_set_s32(struct nftnl_chain *c, uint16_t attr, int32_t data)
329{
330 nftnl_chain_set_data(c, attr, &data, sizeof(int32_t));
331}
332
333EXPORT_SYMBOL(nftnl_chain_set_u64);
334void nftnl_chain_set_u64(struct nftnl_chain *c, uint16_t attr, uint64_t data)
335{
336 nftnl_chain_set_data(c, attr, &data, sizeof(uint64_t));
337}
338
339EXPORT_SYMBOL(nftnl_chain_set_u8);
340void nftnl_chain_set_u8(struct nftnl_chain *c, uint16_t attr, uint8_t data)
341{
342 nftnl_chain_set_data(c, attr, &data, sizeof(uint8_t));
343}
344
345EXPORT_SYMBOL(nftnl_chain_set_str);
346int nftnl_chain_set_str(struct nftnl_chain *c, uint16_t attr, const char *str)
347{
348 return nftnl_chain_set_data(c, attr, str, strlen(str) + 1);
349}
350
351EXPORT_SYMBOL(nftnl_chain_set_array);
352int nftnl_chain_set_array(struct nftnl_chain *c, uint16_t attr,
353 const char **data)
354{
355 return nftnl_chain_set_data(c, attr, data, 0);
356}
357
358EXPORT_SYMBOL(nftnl_chain_get_data);
359const void *nftnl_chain_get_data(const struct nftnl_chain *c, uint16_t attr,
360 uint32_t *data_len)
361{
362 if (!(c->flags & (1 << attr)))
363 return NULL;
364
365 switch(attr) {
366 case NFTNL_CHAIN_NAME:
367 *data_len = strlen(c->name) + 1;
368 return c->name;
369 case NFTNL_CHAIN_TABLE:
370 *data_len = strlen(c->table) + 1;
371 return c->table;
372 case NFTNL_CHAIN_HOOKNUM:
373 *data_len = sizeof(uint32_t);
374 return &c->hooknum;
375 case NFTNL_CHAIN_PRIO:
376 *data_len = sizeof(int32_t);
377 return &c->prio;
378 case NFTNL_CHAIN_POLICY:
379 *data_len = sizeof(uint32_t);
380 return &c->policy;
381 case NFTNL_CHAIN_USE:
382 *data_len = sizeof(uint32_t);
383 return &c->use;
384 case NFTNL_CHAIN_BYTES:
385 *data_len = sizeof(uint64_t);
386 return &c->bytes;
387 case NFTNL_CHAIN_PACKETS:
388 *data_len = sizeof(uint64_t);
389 return &c->packets;
390 case NFTNL_CHAIN_HANDLE:
391 *data_len = sizeof(uint64_t);
392 return &c->handle;
393 case NFTNL_CHAIN_FAMILY:
394 *data_len = sizeof(uint32_t);
395 return &c->family;
396 case NFTNL_CHAIN_TYPE:
397 *data_len = sizeof(uint32_t);
398 return c->type;
399 case NFTNL_CHAIN_DEV:
400 *data_len = strlen(c->dev) + 1;
401 return c->dev;
402 case NFTNL_CHAIN_DEVICES:
403 *data_len = 0;
404 return &c->dev_array[0];
405 case NFTNL_CHAIN_FLAGS:
406 *data_len = sizeof(uint32_t);
407 return &c->chain_flags;
408 case NFTNL_CHAIN_ID:
409 *data_len = sizeof(uint32_t);
410 return &c->chain_id;
411 case NFTNL_CHAIN_USERDATA:
412 *data_len = c->user.len;
413 return c->user.data;
414 }
415 return NULL;
416}
417
418EXPORT_SYMBOL(nftnl_chain_get);
419const void *nftnl_chain_get(const struct nftnl_chain *c, uint16_t attr)
420{
421 uint32_t data_len;
422 return nftnl_chain_get_data(c, attr, &data_len);
423}
424
425EXPORT_SYMBOL(nftnl_chain_get_str);
426const char *nftnl_chain_get_str(const struct nftnl_chain *c, uint16_t attr)
427{
428 return nftnl_chain_get(c, attr);
429}
430
431EXPORT_SYMBOL(nftnl_chain_get_u32);
432uint32_t nftnl_chain_get_u32(const struct nftnl_chain *c, uint16_t attr)
433{
434 uint32_t data_len;
435 const uint32_t *val = nftnl_chain_get_data(c, attr, &data_len);
436
437 nftnl_assert(val, attr, data_len == sizeof(uint32_t));
438
439 return val ? *val : 0;
440}
441
442EXPORT_SYMBOL(nftnl_chain_get_s32);
443int32_t nftnl_chain_get_s32(const struct nftnl_chain *c, uint16_t attr)
444{
445 uint32_t data_len;
446 const int32_t *val = nftnl_chain_get_data(c, attr, &data_len);
447
448 nftnl_assert(val, attr, data_len == sizeof(int32_t));
449
450 return val ? *val : 0;
451}
452
453EXPORT_SYMBOL(nftnl_chain_get_u64);
454uint64_t nftnl_chain_get_u64(const struct nftnl_chain *c, uint16_t attr)
455{
456 uint32_t data_len;
457 const uint64_t *val = nftnl_chain_get_data(c, attr, &data_len);
458
459 nftnl_assert(val, attr, data_len == sizeof(int64_t));
460
461 return val ? *val : 0;
462}
463
464EXPORT_SYMBOL(nftnl_chain_get_u8);
465uint8_t nftnl_chain_get_u8(const struct nftnl_chain *c, uint16_t attr)
466{
467 uint32_t data_len;
468 const uint8_t *val = nftnl_chain_get_data(c, attr, &data_len);
469
470 nftnl_assert(val, attr, data_len == sizeof(int8_t));
471
472 return val ? *val : 0;
473}
474
475EXPORT_SYMBOL(nftnl_chain_get_array);
476const char *const *nftnl_chain_get_array(const struct nftnl_chain *c, uint16_t attr)
477{
478 uint32_t data_len;
479 const char * const *val = nftnl_chain_get_data(c, attr, &data_len);
480
481 nftnl_assert(val, attr, attr == NFTNL_CHAIN_DEVICES);
482
483 return val;
484}
485
486EXPORT_SYMBOL(nftnl_chain_nlmsg_build_payload);
487void nftnl_chain_nlmsg_build_payload(struct nlmsghdr *nlh, const struct nftnl_chain *c)
488{
489 struct nlattr *nest = NULL;
490 int i;
491
492 if (c->flags & (1 << NFTNL_CHAIN_TABLE))
493 mnl_attr_put_strz(nlh, NFTA_CHAIN_TABLE, c->table);
494 if (c->flags & (1 << NFTNL_CHAIN_NAME))
495 mnl_attr_put_strz(nlh, NFTA_CHAIN_NAME, c->name);
496
497 if ((c->flags & (1 << NFTNL_CHAIN_HOOKNUM)) ||
498 (c->flags & (1 << NFTNL_CHAIN_PRIO)) ||
499 (c->flags & (1 << NFTNL_CHAIN_DEV)) ||
500 (c->flags & (1 << NFTNL_CHAIN_DEVICES)))
501 nest = mnl_attr_nest_start(nlh, NFTA_CHAIN_HOOK);
502
503 if ((c->flags & (1 << NFTNL_CHAIN_HOOKNUM)))
504 mnl_attr_put_u32(nlh, NFTA_HOOK_HOOKNUM, htonl(c->hooknum));
505 if ((c->flags & (1 << NFTNL_CHAIN_PRIO)))
506 mnl_attr_put_u32(nlh, NFTA_HOOK_PRIORITY, htonl(c->prio));
507
508 if (c->flags & (1 << NFTNL_CHAIN_DEV))
509 mnl_attr_put_strz(nlh, NFTA_HOOK_DEV, c->dev);
510 else if (c->flags & (1 << NFTNL_CHAIN_DEVICES)) {
511 struct nlattr *nest_dev;
512
513 nest_dev = mnl_attr_nest_start(nlh, NFTA_HOOK_DEVS);
514 for (i = 0; i < c->dev_array_len; i++)
515 mnl_attr_put_strz(nlh, NFTA_DEVICE_NAME,
516 c->dev_array[i]);
517 mnl_attr_nest_end(nlh, nest_dev);
518 }
519
520 if ((c->flags & (1 << NFTNL_CHAIN_HOOKNUM)) ||
521 (c->flags & (1 << NFTNL_CHAIN_PRIO)) ||
522 (c->flags & (1 << NFTNL_CHAIN_DEV)) ||
523 (c->flags & (1 << NFTNL_CHAIN_DEVICES)))
524 mnl_attr_nest_end(nlh, nest);
525
526 if (c->flags & (1 << NFTNL_CHAIN_POLICY))
527 mnl_attr_put_u32(nlh, NFTA_CHAIN_POLICY, htonl(c->policy));
528 if (c->flags & (1 << NFTNL_CHAIN_USE))
529 mnl_attr_put_u32(nlh, NFTA_CHAIN_USE, htonl(c->use));
530 if ((c->flags & (1 << NFTNL_CHAIN_PACKETS)) &&
531 (c->flags & (1 << NFTNL_CHAIN_BYTES))) {
532 nest = mnl_attr_nest_start(nlh, NFTA_CHAIN_COUNTERS);
533 mnl_attr_put_u64(nlh, NFTA_COUNTER_PACKETS, be64toh(c->packets));
534 mnl_attr_put_u64(nlh, NFTA_COUNTER_BYTES, be64toh(c->bytes));
535 mnl_attr_nest_end(nlh, nest);
536 }
537 if (c->flags & (1 << NFTNL_CHAIN_HANDLE))
538 mnl_attr_put_u64(nlh, NFTA_CHAIN_HANDLE, be64toh(c->handle));
539 if (c->flags & (1 << NFTNL_CHAIN_TYPE))
540 mnl_attr_put_strz(nlh, NFTA_CHAIN_TYPE, c->type);
541 if (c->flags & (1 << NFTNL_CHAIN_FLAGS))
542 mnl_attr_put_u32(nlh, NFTA_CHAIN_FLAGS, htonl(c->chain_flags));
543 if (c->flags & (1 << NFTNL_CHAIN_ID))
544 mnl_attr_put_u32(nlh, NFTA_CHAIN_ID, htonl(c->chain_id));
545 if (c->flags & (1 << NFTNL_CHAIN_USERDATA))
546 mnl_attr_put(nlh, NFTA_CHAIN_USERDATA, c->user.len, c->user.data);
547}
548
549EXPORT_SYMBOL(nftnl_chain_rule_add);
550void nftnl_chain_rule_add(struct nftnl_rule *rule, struct nftnl_chain *c)
551{
552 list_add(&rule->head, &c->rule_list);
553}
554
555EXPORT_SYMBOL(nftnl_chain_rule_del);
556void nftnl_chain_rule_del(struct nftnl_rule *r)
557{
558 list_del(&r->head);
559}
560
561EXPORT_SYMBOL(nftnl_chain_rule_add_tail);
562void nftnl_chain_rule_add_tail(struct nftnl_rule *rule, struct nftnl_chain *c)
563{
564 list_add_tail(&rule->head, &c->rule_list);
565}
566
567EXPORT_SYMBOL(nftnl_chain_rule_insert_at);
568void nftnl_chain_rule_insert_at(struct nftnl_rule *rule, struct nftnl_rule *pos)
569{
570 list_add_tail(&rule->head, &pos->head);
571}
572
573EXPORT_SYMBOL(nftnl_chain_rule_append_at);
574void nftnl_chain_rule_append_at(struct nftnl_rule *rule, struct nftnl_rule *pos)
575{
576 list_add(&rule->head, &pos->head);
577}
578
579static int nftnl_chain_parse_attr_cb(const struct nlattr *attr, void *data)
580{
581 const struct nlattr **tb = data;
582 int type = mnl_attr_get_type(attr);
583
584 if (mnl_attr_type_valid(attr, NFTA_CHAIN_MAX) < 0)
585 return MNL_CB_OK;
586
587 switch(type) {
588 case NFTA_CHAIN_NAME:
589 case NFTA_CHAIN_TABLE:
590 case NFTA_CHAIN_TYPE:
591 if (mnl_attr_validate(attr, MNL_TYPE_STRING) < 0)
592 abi_breakage();
593 break;
594 case NFTA_CHAIN_HOOK:
595 case NFTA_CHAIN_COUNTERS:
596 if (mnl_attr_validate(attr, MNL_TYPE_NESTED) < 0)
597 abi_breakage();
598 break;
599 case NFTA_CHAIN_POLICY:
600 case NFTA_CHAIN_USE:
601 case NFTA_CHAIN_FLAGS:
602 case NFTA_CHAIN_ID:
603 if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
604 abi_breakage();
605 break;
606 case NFTA_CHAIN_HANDLE:
607 if (mnl_attr_validate(attr, MNL_TYPE_U64) < 0)
608 abi_breakage();
609 break;
610 case NFTA_CHAIN_USERDATA:
611 if (mnl_attr_validate(attr, MNL_TYPE_BINARY) < 0)
612 abi_breakage();
613 break;
614 }
615
616 tb[type] = attr;
617 return MNL_CB_OK;
618}
619
620static int nftnl_chain_parse_counters_cb(const struct nlattr *attr, void *data)
621{
622 const struct nlattr **tb = data;
623 int type = mnl_attr_get_type(attr);
624
625 if (mnl_attr_type_valid(attr, NFTA_COUNTER_MAX) < 0)
626 return MNL_CB_OK;
627
628 switch(type) {
629 case NFTA_COUNTER_BYTES:
630 case NFTA_COUNTER_PACKETS:
631 if (mnl_attr_validate(attr, MNL_TYPE_U64) < 0)
632 abi_breakage();
633 break;
634 }
635
636 tb[type] = attr;
637 return MNL_CB_OK;
638}
639
640static int nftnl_chain_parse_counters(struct nlattr *attr, struct nftnl_chain *c)
641{
642 struct nlattr *tb[NFTA_COUNTER_MAX+1] = {};
643
644 if (mnl_attr_parse_nested(attr, nftnl_chain_parse_counters_cb, tb) < 0)
645 return -1;
646
647 if (tb[NFTA_COUNTER_PACKETS]) {
648 c->packets = be64toh(mnl_attr_get_u64(tb[NFTA_COUNTER_PACKETS]));
649 c->flags |= (1 << NFTNL_CHAIN_PACKETS);
650 }
651 if (tb[NFTA_COUNTER_BYTES]) {
652 c->bytes = be64toh(mnl_attr_get_u64(tb[NFTA_COUNTER_BYTES]));
653 c->flags |= (1 << NFTNL_CHAIN_BYTES);
654 }
655
656 return 0;
657}
658
659static int nftnl_chain_parse_hook_cb(const struct nlattr *attr, void *data)
660{
661 const struct nlattr **tb = data;
662 int type = mnl_attr_get_type(attr);
663
664 if (mnl_attr_type_valid(attr, NFTA_HOOK_MAX) < 0)
665 return MNL_CB_OK;
666
667 switch(type) {
668 case NFTA_HOOK_HOOKNUM:
669 case NFTA_HOOK_PRIORITY:
670 if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
671 abi_breakage();
672 break;
673 case NFTA_HOOK_DEV:
674 if (mnl_attr_validate(attr, MNL_TYPE_STRING) < 0)
675 abi_breakage();
676 break;
677 }
678
679 tb[type] = attr;
680 return MNL_CB_OK;
681}
682
683static int nftnl_chain_parse_devs(struct nlattr *nest, struct nftnl_chain *c)
684{
685 const char **dev_array, **tmp;
686 int len = 0, size = 8;
687 struct nlattr *attr;
688
689 dev_array = calloc(8, sizeof(char *));
690 if (!dev_array)
691 return -1;
692
693 mnl_attr_for_each_nested(attr, nest) {
694 if (mnl_attr_get_type(attr) != NFTA_DEVICE_NAME)
695 goto err;
696 dev_array[len++] = strdup(mnl_attr_get_str(attr));
697 if (len >= size) {
698 tmp = realloc(dev_array, size * 2 * sizeof(char *));
699 if (!tmp)
700 goto err;
701
702 size *= 2;
703 memset(&tmp[len], 0, (size - len) * sizeof(char *));
704 dev_array = tmp;
705 }
706 }
707
708 c->dev_array = dev_array;
709 c->dev_array_len = len;
710
711 return 0;
712err:
713 while (len--)
714 xfree(dev_array[len]);
715 xfree(dev_array);
716 return -1;
717}
718
719static int nftnl_chain_parse_hook(struct nlattr *attr, struct nftnl_chain *c)
720{
721 struct nlattr *tb[NFTA_HOOK_MAX+1] = {};
722 int ret;
723
724 if (mnl_attr_parse_nested(attr, nftnl_chain_parse_hook_cb, tb) < 0)
725 return -1;
726
727 if (tb[NFTA_HOOK_HOOKNUM]) {
728 c->hooknum = ntohl(mnl_attr_get_u32(tb[NFTA_HOOK_HOOKNUM]));
729 c->flags |= (1 << NFTNL_CHAIN_HOOKNUM);
730 }
731 if (tb[NFTA_HOOK_PRIORITY]) {
732 c->prio = ntohl(mnl_attr_get_u32(tb[NFTA_HOOK_PRIORITY]));
733 c->flags |= (1 << NFTNL_CHAIN_PRIO);
734 }
735 if (tb[NFTA_HOOK_DEV]) {
736 c->dev = strdup(mnl_attr_get_str(tb[NFTA_HOOK_DEV]));
737 if (!c->dev)
738 return -1;
739 c->flags |= (1 << NFTNL_CHAIN_DEV);
740 }
741 if (tb[NFTA_HOOK_DEVS]) {
742 ret = nftnl_chain_parse_devs(tb[NFTA_HOOK_DEVS], c);
743 if (ret < 0)
744 return -1;
745 c->flags |= (1 << NFTNL_CHAIN_DEVICES);
746 }
747
748 return 0;
749}
750
751EXPORT_SYMBOL(nftnl_chain_nlmsg_parse);
752int nftnl_chain_nlmsg_parse(const struct nlmsghdr *nlh, struct nftnl_chain *c)
753{
754 struct nlattr *tb[NFTA_CHAIN_MAX+1] = {};
755 struct nfgenmsg *nfg = mnl_nlmsg_get_payload(nlh);
756 int ret = 0;
757
758 if (mnl_attr_parse(nlh, sizeof(*nfg), nftnl_chain_parse_attr_cb, tb) < 0)
759 return -1;
760
761 if (tb[NFTA_CHAIN_NAME]) {
762 if (c->flags & (1 << NFTNL_CHAIN_NAME))
763 xfree(c->name);
764 c->name = strdup(mnl_attr_get_str(tb[NFTA_CHAIN_NAME]));
765 if (!c->name)
766 return -1;
767 c->flags |= (1 << NFTNL_CHAIN_NAME);
768 }
769 if (tb[NFTA_CHAIN_TABLE]) {
770 if (c->flags & (1 << NFTNL_CHAIN_TABLE))
771 xfree(c->table);
772 c->table = strdup(mnl_attr_get_str(tb[NFTA_CHAIN_TABLE]));
773 if (!c->table)
774 return -1;
775 c->flags |= (1 << NFTNL_CHAIN_TABLE);
776 }
777 if (tb[NFTA_CHAIN_HOOK]) {
778 ret = nftnl_chain_parse_hook(tb[NFTA_CHAIN_HOOK], c);
779 if (ret < 0)
780 return ret;
781 }
782 if (tb[NFTA_CHAIN_POLICY]) {
783 c->policy = ntohl(mnl_attr_get_u32(tb[NFTA_CHAIN_POLICY]));
784 c->flags |= (1 << NFTNL_CHAIN_POLICY);
785 }
786 if (tb[NFTA_CHAIN_USE]) {
787 c->use = ntohl(mnl_attr_get_u32(tb[NFTA_CHAIN_USE]));
788 c->flags |= (1 << NFTNL_CHAIN_USE);
789 }
790 if (tb[NFTA_CHAIN_COUNTERS]) {
791 ret = nftnl_chain_parse_counters(tb[NFTA_CHAIN_COUNTERS], c);
792 if (ret < 0)
793 return ret;
794 }
795 if (tb[NFTA_CHAIN_HANDLE]) {
796 c->handle = be64toh(mnl_attr_get_u64(tb[NFTA_CHAIN_HANDLE]));
797 c->flags |= (1 << NFTNL_CHAIN_HANDLE);
798 }
799 if (tb[NFTA_CHAIN_TYPE]) {
800 if (c->flags & (1 << NFTNL_CHAIN_TYPE))
801 xfree(c->type);
802 c->type = strdup(mnl_attr_get_str(tb[NFTA_CHAIN_TYPE]));
803 if (!c->type)
804 return -1;
805 c->flags |= (1 << NFTNL_CHAIN_TYPE);
806 }
807 if (tb[NFTA_CHAIN_FLAGS]) {
808 c->chain_flags = ntohl(mnl_attr_get_u32(tb[NFTA_CHAIN_FLAGS]));
809 c->flags |= (1 << NFTNL_CHAIN_FLAGS);
810 }
811 if (tb[NFTA_CHAIN_ID]) {
812 c->chain_id = ntohl(mnl_attr_get_u32(tb[NFTA_CHAIN_ID]));
813 c->flags |= (1 << NFTNL_CHAIN_ID);
814 }
815 if (tb[NFTA_CHAIN_USERDATA]) {
816 nftnl_chain_set_data(c, NFTNL_CHAIN_USERDATA,
817 mnl_attr_get_payload(tb[NFTA_CHAIN_USERDATA]),
818 mnl_attr_get_payload_len(tb[NFTA_CHAIN_USERDATA]));
819 }
820
821 c->family = nfg->nfgen_family;
822 c->flags |= (1 << NFTNL_CHAIN_FAMILY);
823
824 return ret;
825}
826
827static inline int nftnl_str2hooknum(int family, const char *hook)
828{
829 int hooknum;
830
831 for (hooknum = 0; hooknum < NF_INET_NUMHOOKS; hooknum++) {
832 if (strcmp(hook, nftnl_hooknum2str(family, hooknum)) == 0)
833 return hooknum;
834 }
835 return -1;
836}
837
838static int nftnl_chain_snprintf_default(char *buf, size_t remain,
839 const struct nftnl_chain *c)
840{
841 int ret, offset = 0, i;
842
843 ret = snprintf(buf, remain, "%s %s %s use %u",
844 nftnl_family2str(c->family), c->table, c->name, c->use);
845 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
846
847 if (c->flags & (1 << NFTNL_CHAIN_HOOKNUM)) {
848 ret = snprintf(buf + offset, remain, " type %s hook %s prio %d",
849 c->type, nftnl_hooknum2str(c->family, c->hooknum),
850 c->prio);
851 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
852
853 if (c->flags & (1 << NFTNL_CHAIN_POLICY)) {
854 ret = snprintf(buf + offset, remain, " policy %s",
855 nftnl_verdict2str(c->policy));
856 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
857 }
858
859 ret = snprintf(buf + offset, remain,
860 " packets %"PRIu64" bytes %"PRIu64"",
861 c->packets, c->bytes);
862 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
863
864 if (c->flags & (1 << NFTNL_CHAIN_DEV)) {
865 ret = snprintf(buf + offset, remain, " dev %s ",
866 c->dev);
867 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
868 }
869 if (c->flags & (1 << NFTNL_CHAIN_DEVICES)) {
870 ret = snprintf(buf + offset, remain, " dev { ");
871 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
872
873 for (i = 0; i < c->dev_array_len; i++) {
874 ret = snprintf(buf + offset, remain, " %s ",
875 c->dev_array[i]);
876 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
877 }
878 ret = snprintf(buf + offset, remain, " } ");
879 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
880 }
881 if (c->flags & (1 << NFTNL_CHAIN_FLAGS)) {
882 ret = snprintf(buf + offset, remain, " flags %x",
883 c->chain_flags);
884 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
885 }
886 if (c->flags & (1 << NFTNL_CHAIN_ID)) {
887 ret = snprintf(buf + offset, remain, " id %x",
888 c->chain_id);
889 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
890 }
891 }
892
893 return offset;
894}
895
896static int nftnl_chain_cmd_snprintf(char *buf, size_t remain,
897 const struct nftnl_chain *c, uint32_t cmd,
898 uint32_t type, uint32_t flags)
899{
900 int ret, offset = 0;
901
902 if (type != NFTNL_OUTPUT_DEFAULT)
903 return -1;
904
905 ret = nftnl_chain_snprintf_default(buf + offset, remain, c);
906 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
907 return offset;
908}
909
910EXPORT_SYMBOL(nftnl_chain_snprintf);
911int nftnl_chain_snprintf(char *buf, size_t size, const struct nftnl_chain *c,
912 uint32_t type, uint32_t flags)
913{
914 if (size)
915 buf[0] = '\0';
916
917 return nftnl_chain_cmd_snprintf(buf, size, c, nftnl_flag2cmd(flags),
918 type, flags);
919}
920
921static int nftnl_chain_do_snprintf(char *buf, size_t size, const void *c,
922 uint32_t cmd, uint32_t type, uint32_t flags)
923{
924 return nftnl_chain_snprintf(buf, size, c, type, flags);
925}
926
927EXPORT_SYMBOL(nftnl_chain_fprintf);
928int nftnl_chain_fprintf(FILE *fp, const struct nftnl_chain *c, uint32_t type,
929 uint32_t flags)
930{
931 return nftnl_fprintf(fp, c, NFTNL_CMD_UNSPEC, type, flags,
932 nftnl_chain_do_snprintf);
933}
934
935EXPORT_SYMBOL(nftnl_rule_foreach);
936int nftnl_rule_foreach(struct nftnl_chain *c,
937 int (*cb)(struct nftnl_rule *r, void *data),
938 void *data)
939{
940 struct nftnl_rule *cur, *tmp;
941 int ret;
942
943 list_for_each_entry_safe(cur, tmp, &c->rule_list, head) {
944 ret = cb(cur, data);
945 if (ret < 0)
946 return ret;
947 }
948 return 0;
949}
950
951EXPORT_SYMBOL(nftnl_rule_lookup_byindex);
952struct nftnl_rule *
953nftnl_rule_lookup_byindex(struct nftnl_chain *c, uint32_t index)
954{
955 struct nftnl_rule *r;
956
957 list_for_each_entry(r, &c->rule_list, head) {
958 if (!index)
959 return r;
960 index--;
961 }
962 return NULL;
963}
964
966 const struct nftnl_chain *c;
967 struct nftnl_rule *cur;
968};
969
970static void nftnl_rule_iter_init(const struct nftnl_chain *c,
971 struct nftnl_rule_iter *iter)
972{
973 iter->c = c;
974 if (list_empty(&c->rule_list))
975 iter->cur = NULL;
976 else
977 iter->cur = list_entry(c->rule_list.next, struct nftnl_rule,
978 head);
979}
980
981EXPORT_SYMBOL(nftnl_rule_iter_create);
982struct nftnl_rule_iter *nftnl_rule_iter_create(const struct nftnl_chain *c)
983{
984 struct nftnl_rule_iter *iter;
985
986 iter = calloc(1, sizeof(struct nftnl_rule_iter));
987 if (iter == NULL)
988 return NULL;
989
990 nftnl_rule_iter_init(c, iter);
991
992 return iter;
993}
994
995EXPORT_SYMBOL(nftnl_rule_iter_next);
996struct nftnl_rule *nftnl_rule_iter_next(struct nftnl_rule_iter *iter)
997{
998 struct nftnl_rule *rule = iter->cur;
999
1000 if (rule == NULL)
1001 return NULL;
1002
1003 /* get next rule, if any */
1004 iter->cur = list_entry(iter->cur->head.next, struct nftnl_rule, head);
1005 if (&iter->cur->head == iter->c->rule_list.next)
1006 return NULL;
1007
1008 return rule;
1009}
1010
1011EXPORT_SYMBOL(nftnl_rule_iter_destroy);
1012void nftnl_rule_iter_destroy(struct nftnl_rule_iter *iter)
1013{
1014 xfree(iter);
1015}
1016
1017#define CHAIN_NAME_HSIZE 512
1018
1020
1021 struct list_head list;
1022 struct hlist_head name_hash[CHAIN_NAME_HSIZE];
1023};
1024
1025EXPORT_SYMBOL(nftnl_chain_list_alloc);
1026struct nftnl_chain_list *nftnl_chain_list_alloc(void)
1027{
1028 struct nftnl_chain_list *list;
1029 int i;
1030
1031 list = calloc(1, sizeof(struct nftnl_chain_list));
1032 if (list == NULL)
1033 return NULL;
1034
1035 INIT_LIST_HEAD(&list->list);
1036 for (i = 0; i < CHAIN_NAME_HSIZE; i++)
1037 INIT_HLIST_HEAD(&list->name_hash[i]);
1038
1039 return list;
1040}
1041
1042EXPORT_SYMBOL(nftnl_chain_list_free);
1043void nftnl_chain_list_free(struct nftnl_chain_list *list)
1044{
1045 struct nftnl_chain *r, *tmp;
1046
1047 list_for_each_entry_safe(r, tmp, &list->list, head) {
1048 list_del(&r->head);
1049 hlist_del(&r->hnode);
1050 nftnl_chain_free(r);
1051 }
1052 xfree(list);
1053}
1054
1055EXPORT_SYMBOL(nftnl_chain_list_is_empty);
1056int nftnl_chain_list_is_empty(const struct nftnl_chain_list *list)
1057{
1058 return list_empty(&list->list);
1059}
1060
1061static uint32_t djb_hash(const char *key)
1062{
1063 uint32_t i, hash = 5381;
1064
1065 for (i = 0; i < strlen(key); i++)
1066 hash = ((hash << 5) + hash) + key[i];
1067
1068 return hash;
1069}
1070
1071EXPORT_SYMBOL(nftnl_chain_list_add);
1072void nftnl_chain_list_add(struct nftnl_chain *r, struct nftnl_chain_list *list)
1073{
1074 int key = djb_hash(r->name) % CHAIN_NAME_HSIZE;
1075
1076 hlist_add_head(&r->hnode, &list->name_hash[key]);
1077 list_add(&r->head, &list->list);
1078}
1079
1080EXPORT_SYMBOL(nftnl_chain_list_add_tail);
1081void nftnl_chain_list_add_tail(struct nftnl_chain *r, struct nftnl_chain_list *list)
1082{
1083 int key = djb_hash(r->name) % CHAIN_NAME_HSIZE;
1084
1085 hlist_add_head(&r->hnode, &list->name_hash[key]);
1086 list_add_tail(&r->head, &list->list);
1087}
1088
1089EXPORT_SYMBOL(nftnl_chain_list_del);
1090void nftnl_chain_list_del(struct nftnl_chain *r)
1091{
1092 list_del(&r->head);
1093 hlist_del(&r->hnode);
1094}
1095
1096EXPORT_SYMBOL(nftnl_chain_list_foreach);
1097int nftnl_chain_list_foreach(struct nftnl_chain_list *chain_list,
1098 int (*cb)(struct nftnl_chain *r, void *data),
1099 void *data)
1100{
1101 struct nftnl_chain *cur, *tmp;
1102 int ret;
1103
1104 list_for_each_entry_safe(cur, tmp, &chain_list->list, head) {
1105 ret = cb(cur, data);
1106 if (ret < 0)
1107 return ret;
1108 }
1109 return 0;
1110}
1111
1112EXPORT_SYMBOL(nftnl_chain_list_lookup_byname);
1113struct nftnl_chain *
1114nftnl_chain_list_lookup_byname(struct nftnl_chain_list *chain_list,
1115 const char *chain)
1116{
1117 int key = djb_hash(chain) % CHAIN_NAME_HSIZE;
1118 struct nftnl_chain *c;
1119 struct hlist_node *n;
1120
1121 hlist_for_each_entry(c, n, &chain_list->name_hash[key], hnode) {
1122 if (!strcmp(chain, c->name))
1123 return c;
1124 }
1125 return NULL;
1126}
1127
1129 const struct nftnl_chain_list *list;
1130 struct nftnl_chain *cur;
1131};
1132
1133EXPORT_SYMBOL(nftnl_chain_list_iter_create);
1134struct nftnl_chain_list_iter *
1135nftnl_chain_list_iter_create(const struct nftnl_chain_list *l)
1136{
1137 struct nftnl_chain_list_iter *iter;
1138
1139 iter = calloc(1, sizeof(struct nftnl_chain_list_iter));
1140 if (iter == NULL)
1141 return NULL;
1142
1143 iter->list = l;
1144 if (nftnl_chain_list_is_empty(l))
1145 iter->cur = NULL;
1146 else
1147 iter->cur = list_entry(l->list.next, struct nftnl_chain, head);
1148
1149 return iter;
1150}
1151
1152EXPORT_SYMBOL(nftnl_chain_list_iter_next);
1153struct nftnl_chain *nftnl_chain_list_iter_next(struct nftnl_chain_list_iter *iter)
1154{
1155 struct nftnl_chain *r = iter->cur;
1156
1157 if (r == NULL)
1158 return NULL;
1159
1160 /* get next chain, if any */
1161 iter->cur = list_entry(iter->cur->head.next, struct nftnl_chain, head);
1162 if (&iter->cur->head == iter->list->list.next)
1163 return NULL;
1164
1165 return r;
1166}
1167
1168EXPORT_SYMBOL(nftnl_chain_list_iter_destroy);
1169void nftnl_chain_list_iter_destroy(struct nftnl_chain_list_iter *iter)
1170{
1171 xfree(iter);
1172}