13#include <netinet/in.h>
16#include <libmnl/libmnl.h>
17#include <linux/netfilter/nfnetlink.h>
18#include <linux/netfilter/nf_tables.h>
20#include <libnftnl/object.h>
23static struct obj_ops *obj_ops[__NFT_OBJECT_MAX] = {
24 [NFT_OBJECT_COUNTER] = &obj_ops_counter,
25 [NFT_OBJECT_QUOTA] = &obj_ops_quota,
26 [NFT_OBJECT_CT_HELPER] = &obj_ops_ct_helper,
27 [NFT_OBJECT_LIMIT] = &obj_ops_limit,
28 [NFT_OBJECT_TUNNEL] = &obj_ops_tunnel,
29 [NFT_OBJECT_CT_TIMEOUT] = &obj_ops_ct_timeout,
30 [NFT_OBJECT_SECMARK] = &obj_ops_secmark,
31 [NFT_OBJECT_CT_EXPECT] = &obj_ops_ct_expect,
32 [NFT_OBJECT_SYNPROXY] = &obj_ops_synproxy,
35static struct obj_ops *nftnl_obj_ops_lookup(uint32_t type)
37 if (type > NFT_OBJECT_MAX)
43EXPORT_SYMBOL(nftnl_obj_alloc);
44struct nftnl_obj *nftnl_obj_alloc(
void)
46 return calloc(1,
sizeof(
struct nftnl_obj));
49EXPORT_SYMBOL(nftnl_obj_free);
50void nftnl_obj_free(
const struct nftnl_obj *obj)
52 if (obj->flags & (1 << NFTNL_OBJ_TABLE))
54 if (obj->flags & (1 << NFTNL_OBJ_NAME))
56 if (obj->flags & (1 << NFTNL_OBJ_USERDATA))
57 xfree(obj->user.data);
62EXPORT_SYMBOL(nftnl_obj_is_set);
63bool nftnl_obj_is_set(
const struct nftnl_obj *obj, uint16_t attr)
65 return obj->flags & (1 << attr);
68EXPORT_SYMBOL(nftnl_obj_unset);
69void nftnl_obj_unset(
struct nftnl_obj *obj, uint16_t attr)
71 if (!(obj->flags & (1 << attr)))
81 case NFTNL_OBJ_USERDATA:
82 xfree(obj->user.data);
85 case NFTNL_OBJ_FAMILY:
87 case NFTNL_OBJ_HANDLE:
93 obj->flags &= ~(1 << attr);
96static uint32_t nftnl_obj_validate[NFTNL_OBJ_MAX + 1] = {
97 [NFTNL_OBJ_TYPE] =
sizeof(uint32_t),
98 [NFTNL_OBJ_FAMILY] =
sizeof(uint32_t),
99 [NFTNL_OBJ_USE] =
sizeof(uint32_t),
100 [NFTNL_OBJ_HANDLE] =
sizeof(uint64_t),
103EXPORT_SYMBOL(nftnl_obj_set_data);
104int nftnl_obj_set_data(
struct nftnl_obj *obj, uint16_t attr,
105 const void *data, uint32_t data_len)
107 if (attr < NFTNL_OBJ_MAX)
108 nftnl_assert_validate(data, nftnl_obj_validate, attr, data_len);
111 case NFTNL_OBJ_TABLE:
112 return nftnl_set_str_attr(&obj->table, &obj->flags,
113 attr, data, data_len);
116 return nftnl_set_str_attr(&obj->name, &obj->flags,
117 attr, data, data_len);
119 obj->ops = nftnl_obj_ops_lookup(*((uint32_t *)data));
123 case NFTNL_OBJ_FAMILY:
124 memcpy(&obj->family, data,
sizeof(obj->family));
127 memcpy(&obj->use, data,
sizeof(obj->use));
129 case NFTNL_OBJ_HANDLE:
130 memcpy(&obj->handle, data,
sizeof(obj->handle));
132 case NFTNL_OBJ_USERDATA:
133 if (obj->flags & (1 << NFTNL_OBJ_USERDATA))
134 xfree(obj->user.data);
136 obj->user.data = malloc(data_len);
139 memcpy(obj->user.data, data, data_len);
140 obj->user.len = data_len;
144 attr < NFTNL_OBJ_BASE ||
145 attr > obj->ops->nftnl_max_attr ||
146 !obj->ops->attr_policy)
149 if (obj->ops->attr_policy[attr].maxlen &&
150 obj->ops->attr_policy[attr].maxlen < data_len)
153 if (obj->ops->set(obj, attr, data, data_len) < 0)
156 obj->flags |= (1 << attr);
160void nftnl_obj_set(
struct nftnl_obj *obj, uint16_t attr,
const void *data) __visible;
161void nftnl_obj_set(
struct nftnl_obj *obj, uint16_t attr,
const void *data)
163 nftnl_obj_set_data(obj, attr, data, nftnl_obj_validate[attr]);
166EXPORT_SYMBOL(nftnl_obj_set_u8);
167int nftnl_obj_set_u8(
struct nftnl_obj *obj, uint16_t attr, uint8_t val)
169 return nftnl_obj_set_data(obj, attr, &val,
sizeof(uint8_t));
172EXPORT_SYMBOL(nftnl_obj_set_u16);
173int nftnl_obj_set_u16(
struct nftnl_obj *obj, uint16_t attr, uint16_t val)
175 return nftnl_obj_set_data(obj, attr, &val,
sizeof(uint16_t));
178EXPORT_SYMBOL(nftnl_obj_set_u32);
179int nftnl_obj_set_u32(
struct nftnl_obj *obj, uint16_t attr, uint32_t val)
181 return nftnl_obj_set_data(obj, attr, &val,
sizeof(uint32_t));
184EXPORT_SYMBOL(nftnl_obj_set_u64);
185int nftnl_obj_set_u64(
struct nftnl_obj *obj, uint16_t attr, uint64_t val)
187 return nftnl_obj_set_data(obj, attr, &val,
sizeof(uint64_t));
190EXPORT_SYMBOL(nftnl_obj_set_str);
191int nftnl_obj_set_str(
struct nftnl_obj *obj, uint16_t attr,
const char *str)
193 return nftnl_obj_set_data(obj, attr, str, strlen(str) + 1);
196EXPORT_SYMBOL(nftnl_obj_get_data);
197const void *nftnl_obj_get_data(
const struct nftnl_obj *obj, uint16_t attr,
200 if (!(obj->flags & (1 << attr)))
204 case NFTNL_OBJ_TABLE:
212 *data_len =
sizeof(uint32_t);
213 return &obj->ops->type;
214 case NFTNL_OBJ_FAMILY:
215 *data_len =
sizeof(uint32_t);
218 *data_len =
sizeof(uint32_t);
220 case NFTNL_OBJ_HANDLE:
221 *data_len =
sizeof(uint64_t);
223 case NFTNL_OBJ_USERDATA:
224 *data_len = obj->user.len;
225 return obj->user.data;
228 return obj->ops->get(obj, attr, data_len);
234EXPORT_SYMBOL(nftnl_obj_get);
235const void *nftnl_obj_get(
const struct nftnl_obj *obj, uint16_t attr)
238 return nftnl_obj_get_data(obj, attr, &data_len);
241EXPORT_SYMBOL(nftnl_obj_get_u8);
242uint8_t nftnl_obj_get_u8(
const struct nftnl_obj *obj, uint16_t attr)
244 const void *ret = nftnl_obj_get(obj, attr);
245 return ret == NULL ? 0 : *((uint8_t *)ret);
248EXPORT_SYMBOL(nftnl_obj_get_u16);
249uint16_t nftnl_obj_get_u16(
const struct nftnl_obj *obj, uint16_t attr)
251 const void *ret = nftnl_obj_get(obj, attr);
252 return ret == NULL ? 0 : *((uint16_t *)ret);
255EXPORT_SYMBOL(nftnl_obj_get_u32);
256uint32_t nftnl_obj_get_u32(
const struct nftnl_obj *obj, uint16_t attr)
258 const void *ret = nftnl_obj_get(obj, attr);
259 return ret == NULL ? 0 : *((uint32_t *)ret);
262EXPORT_SYMBOL(nftnl_obj_get_u64);
263uint64_t nftnl_obj_get_u64(
const struct nftnl_obj *obj, uint16_t attr)
265 const void *ret = nftnl_obj_get(obj, attr);
266 return ret == NULL ? 0 : *((uint64_t *)ret);
269EXPORT_SYMBOL(nftnl_obj_get_str);
270const char *nftnl_obj_get_str(
const struct nftnl_obj *obj, uint16_t attr)
272 return nftnl_obj_get(obj, attr);
275EXPORT_SYMBOL(nftnl_obj_nlmsg_build_payload);
276void nftnl_obj_nlmsg_build_payload(
struct nlmsghdr *nlh,
277 const struct nftnl_obj *obj)
279 if (obj->flags & (1 << NFTNL_OBJ_TABLE))
280 mnl_attr_put_strz(nlh, NFTA_OBJ_TABLE, obj->table);
281 if (obj->flags & (1 << NFTNL_OBJ_NAME))
282 mnl_attr_put_strz(nlh, NFTA_OBJ_NAME, obj->name);
283 if (obj->flags & (1 << NFTNL_OBJ_TYPE))
284 mnl_attr_put_u32(nlh, NFTA_OBJ_TYPE, htonl(obj->ops->type));
285 if (obj->flags & (1 << NFTNL_OBJ_HANDLE))
286 mnl_attr_put_u64(nlh, NFTA_OBJ_HANDLE, htobe64(obj->handle));
287 if (obj->flags & (1 << NFTNL_OBJ_USERDATA))
288 mnl_attr_put(nlh, NFTA_OBJ_USERDATA, obj->user.len, obj->user.data);
290 struct nlattr *nest = mnl_attr_nest_start(nlh, NFTA_OBJ_DATA);
292 obj->ops->build(nlh, obj);
293 mnl_attr_nest_end(nlh, nest);
297static int nftnl_obj_parse_attr_cb(
const struct nlattr *attr,
void *data)
299 const struct nlattr **tb = data;
300 int type = mnl_attr_get_type(attr);
302 if (mnl_attr_type_valid(attr, NFTA_OBJ_MAX) < 0)
308 if (mnl_attr_validate(attr, MNL_TYPE_STRING) < 0)
311 case NFTA_OBJ_HANDLE:
312 if (mnl_attr_validate(attr, MNL_TYPE_U64) < 0)
316 if (mnl_attr_validate(attr, MNL_TYPE_NESTED) < 0)
320 if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
323 case NFTA_OBJ_USERDATA:
324 if (mnl_attr_validate(attr, MNL_TYPE_BINARY) < 0)
333EXPORT_SYMBOL(nftnl_obj_nlmsg_parse);
334int nftnl_obj_nlmsg_parse(
const struct nlmsghdr *nlh,
struct nftnl_obj *obj)
336 struct nfgenmsg *nfg = mnl_nlmsg_get_payload(nlh);
337 struct nlattr *tb[NFTA_OBJ_MAX + 1] = {};
340 if (mnl_attr_parse(nlh,
sizeof(*nfg), nftnl_obj_parse_attr_cb, tb) < 0)
343 if (tb[NFTA_OBJ_TABLE]) {
344 obj->table = strdup(mnl_attr_get_str(tb[NFTA_OBJ_TABLE]));
345 obj->flags |= (1 << NFTNL_OBJ_TABLE);
347 if (tb[NFTA_OBJ_NAME]) {
348 obj->name = strdup(mnl_attr_get_str(tb[NFTA_OBJ_NAME]));
349 obj->flags |= (1 << NFTNL_OBJ_NAME);
351 if (tb[NFTA_OBJ_TYPE]) {
352 uint32_t type = ntohl(mnl_attr_get_u32(tb[NFTA_OBJ_TYPE]));
354 obj->ops = nftnl_obj_ops_lookup(type);
356 obj->flags |= (1 << NFTNL_OBJ_TYPE);
358 if (tb[NFTA_OBJ_DATA]) {
360 err = obj->ops->parse(obj, tb[NFTA_OBJ_DATA]);
365 if (tb[NFTA_OBJ_USE]) {
366 obj->use = ntohl(mnl_attr_get_u32(tb[NFTA_OBJ_USE]));
367 obj->flags |= (1 << NFTNL_OBJ_USE);
369 if (tb[NFTA_OBJ_HANDLE]) {
370 obj->handle = be64toh(mnl_attr_get_u64(tb[NFTA_OBJ_HANDLE]));
371 obj->flags |= (1 << NFTNL_OBJ_HANDLE);
373 if (tb[NFTA_OBJ_USERDATA]) {
374 nftnl_obj_set_data(obj, NFTNL_OBJ_USERDATA,
375 mnl_attr_get_payload(tb[NFTA_OBJ_USERDATA]),
376 mnl_attr_get_payload_len(tb[NFTA_OBJ_USERDATA]));
379 obj->family = nfg->nfgen_family;
380 obj->flags |= (1 << NFTNL_OBJ_FAMILY);
385EXPORT_SYMBOL(nftnl_obj_parse);
386int nftnl_obj_parse(
struct nftnl_obj *obj,
enum nftnl_parse_type type,
387 const char *data,
struct nftnl_parse_err *err)
394EXPORT_SYMBOL(nftnl_obj_parse_file);
395int nftnl_obj_parse_file(
struct nftnl_obj *obj,
enum nftnl_parse_type type,
396 FILE *fp,
struct nftnl_parse_err *err)
403static int nftnl_obj_snprintf_dflt(
char *buf,
size_t remain,
404 const struct nftnl_obj *obj,
405 uint32_t type, uint32_t flags)
407 const char *name = obj->ops ? obj->ops->name :
"(unknown)";
410 ret = snprintf(buf, remain,
"table %s name %s use %u [ %s ",
411 obj->table, obj->name, obj->use, name);
412 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
415 ret = obj->ops->output(buf + offset, remain, flags, obj);
416 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
418 ret = snprintf(buf + offset, remain,
"]");
419 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
424static int nftnl_obj_cmd_snprintf(
char *buf,
size_t remain,
425 const struct nftnl_obj *obj, uint32_t cmd,
426 uint32_t type, uint32_t flags)
430 if (type != NFTNL_OUTPUT_DEFAULT)
433 ret = nftnl_obj_snprintf_dflt(buf + offset, remain, obj, type, flags);
434 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
438EXPORT_SYMBOL(nftnl_obj_snprintf);
439int nftnl_obj_snprintf(
char *buf,
size_t size,
const struct nftnl_obj *obj,
440 uint32_t type, uint32_t flags)
445 return nftnl_obj_cmd_snprintf(buf, size, obj, nftnl_flag2cmd(flags),
449static int nftnl_obj_do_snprintf(
char *buf,
size_t size,
const void *obj,
450 uint32_t cmd, uint32_t type, uint32_t flags)
452 return nftnl_obj_snprintf(buf, size, obj, type, flags);
455EXPORT_SYMBOL(nftnl_obj_fprintf);
456int nftnl_obj_fprintf(FILE *fp,
const struct nftnl_obj *obj, uint32_t type,
459 return nftnl_fprintf(fp, obj, NFTNL_CMD_UNSPEC, type, flags,
460 nftnl_obj_do_snprintf);
464 struct list_head list;
467EXPORT_SYMBOL(nftnl_obj_list_alloc);
476 INIT_LIST_HEAD(&list->list);
481EXPORT_SYMBOL(nftnl_obj_list_free);
484 struct nftnl_obj *r, *tmp;
486 list_for_each_entry_safe(r, tmp, &list->list, head) {
493EXPORT_SYMBOL(nftnl_obj_list_is_empty);
496 return list_empty(&list->list);
499EXPORT_SYMBOL(nftnl_obj_list_add);
500void nftnl_obj_list_add(
struct nftnl_obj *r,
struct nftnl_obj_list *list)
502 list_add(&r->head, &list->list);
505EXPORT_SYMBOL(nftnl_obj_list_add_tail);
506void nftnl_obj_list_add_tail(
struct nftnl_obj *r,
509 list_add_tail(&r->head, &list->list);
512EXPORT_SYMBOL(nftnl_obj_list_del);
513void nftnl_obj_list_del(
struct nftnl_obj *t)
518EXPORT_SYMBOL(nftnl_obj_list_foreach);
520 int (*cb)(
struct nftnl_obj *t,
void *data),
523 struct nftnl_obj *cur, *tmp;
526 list_for_each_entry_safe(cur, tmp, &table_list->list, head) {
536 struct nftnl_obj *cur;
539EXPORT_SYMBOL(nftnl_obj_list_iter_create);
550 if (nftnl_obj_list_is_empty(l))
553 iter->cur = list_entry(l->list.next,
struct nftnl_obj, head);
558EXPORT_SYMBOL(nftnl_obj_list_iter_next);
561 struct nftnl_obj *r = iter->cur;
567 iter->cur = list_entry(iter->cur->head.next,
struct nftnl_obj, head);
568 if (&iter->cur->head == iter->list->list.next)
574EXPORT_SYMBOL(nftnl_obj_list_iter_destroy);