19#include <netinet/in.h>
21#include <libmnl/libmnl.h>
22#include <linux/netfilter/nfnetlink.h>
23#include <linux/netfilter/nf_tables.h>
25#include <libnftnl/expr.h>
27EXPORT_SYMBOL(nftnl_expr_alloc);
28struct nftnl_expr *nftnl_expr_alloc(
const char *name)
30 struct nftnl_expr *expr;
33 ops = nftnl_expr_ops_lookup(name);
37 expr = calloc(1,
sizeof(
struct nftnl_expr) + ops->alloc_len);
42 expr->flags |= (1 << NFTNL_EXPR_NAME);
51EXPORT_SYMBOL(nftnl_expr_free);
52void nftnl_expr_free(
const struct nftnl_expr *expr)
55 expr->ops->free(expr);
60EXPORT_SYMBOL(nftnl_expr_is_set);
61bool nftnl_expr_is_set(
const struct nftnl_expr *expr, uint16_t type)
63 return expr->flags & (1 << type);
66EXPORT_SYMBOL(nftnl_expr_set);
67int nftnl_expr_set(
struct nftnl_expr *expr, uint16_t type,
68 const void *data, uint32_t data_len)
74 if (expr->ops->set(expr, type, data, data_len) < 0)
77 expr->flags |= (1 << type);
81EXPORT_SYMBOL(nftnl_expr_set_u8);
83nftnl_expr_set_u8(
struct nftnl_expr *expr, uint16_t type, uint8_t data)
85 nftnl_expr_set(expr, type, &data,
sizeof(uint8_t));
88EXPORT_SYMBOL(nftnl_expr_set_u16);
90nftnl_expr_set_u16(
struct nftnl_expr *expr, uint16_t type, uint16_t data)
92 nftnl_expr_set(expr, type, &data,
sizeof(uint16_t));
95EXPORT_SYMBOL(nftnl_expr_set_u32);
97nftnl_expr_set_u32(
struct nftnl_expr *expr, uint16_t type, uint32_t data)
99 nftnl_expr_set(expr, type, &data,
sizeof(uint32_t));
102EXPORT_SYMBOL(nftnl_expr_set_u64);
104nftnl_expr_set_u64(
struct nftnl_expr *expr, uint16_t type, uint64_t data)
106 nftnl_expr_set(expr, type, &data,
sizeof(uint64_t));
109EXPORT_SYMBOL(nftnl_expr_set_str);
110int nftnl_expr_set_str(
struct nftnl_expr *expr, uint16_t type,
const char *str)
112 return nftnl_expr_set(expr, type, str, strlen(str) + 1);
115EXPORT_SYMBOL(nftnl_expr_get);
116const void *nftnl_expr_get(
const struct nftnl_expr *expr,
117 uint16_t type, uint32_t *data_len)
121 if (!(expr->flags & (1 << type)))
125 case NFTNL_EXPR_NAME:
126 *data_len = strlen(expr->ops->name) + 1;
127 ret = expr->ops->name;
130 ret = expr->ops->get(expr, type, data_len);
137EXPORT_SYMBOL(nftnl_expr_get_u8);
138uint8_t nftnl_expr_get_u8(
const struct nftnl_expr *expr, uint16_t type)
143 data = nftnl_expr_get(expr, type, &data_len);
147 if (data_len !=
sizeof(uint8_t))
150 return *((uint8_t *)data);
153EXPORT_SYMBOL(nftnl_expr_get_u16);
154uint16_t nftnl_expr_get_u16(
const struct nftnl_expr *expr, uint16_t type)
159 data = nftnl_expr_get(expr, type, &data_len);
163 if (data_len !=
sizeof(uint16_t))
166 return *((uint16_t *)data);
169EXPORT_SYMBOL(nftnl_expr_get_u32);
170uint32_t nftnl_expr_get_u32(
const struct nftnl_expr *expr, uint16_t type)
175 data = nftnl_expr_get(expr, type, &data_len);
179 if (data_len !=
sizeof(uint32_t))
182 return *((uint32_t *)data);
185EXPORT_SYMBOL(nftnl_expr_get_u64);
186uint64_t nftnl_expr_get_u64(
const struct nftnl_expr *expr, uint16_t type)
191 data = nftnl_expr_get(expr, type, &data_len);
195 if (data_len !=
sizeof(uint64_t))
198 return *((uint64_t *)data);
201EXPORT_SYMBOL(nftnl_expr_get_str);
202const char *nftnl_expr_get_str(
const struct nftnl_expr *expr, uint16_t type)
206 return (
const char *)nftnl_expr_get(expr, type, &data_len);
209EXPORT_SYMBOL(nftnl_expr_build_payload);
210void nftnl_expr_build_payload(
struct nlmsghdr *nlh,
struct nftnl_expr *expr)
214 mnl_attr_put_strz(nlh, NFTA_EXPR_NAME, expr->ops->name);
216 if (!expr->ops->build)
219 nest = mnl_attr_nest_start(nlh, NFTA_EXPR_DATA);
220 expr->ops->build(nlh, expr);
221 mnl_attr_nest_end(nlh, nest);
224static int nftnl_rule_parse_expr_cb(
const struct nlattr *attr,
void *data)
226 const struct nlattr **tb = data;
227 int type = mnl_attr_get_type(attr);
229 if (mnl_attr_type_valid(attr, NFTA_EXPR_MAX) < 0)
234 if (mnl_attr_validate(attr, MNL_TYPE_STRING) < 0)
238 if (mnl_attr_validate(attr, MNL_TYPE_NESTED) < 0)
247struct nftnl_expr *nftnl_expr_parse(
struct nlattr *attr)
249 struct nlattr *tb[NFTA_EXPR_MAX+1] = {};
250 struct nftnl_expr *expr;
252 if (mnl_attr_parse_nested(attr, nftnl_rule_parse_expr_cb, tb) < 0)
255 expr = nftnl_expr_alloc(mnl_attr_get_str(tb[NFTA_EXPR_NAME]));
259 if (tb[NFTA_EXPR_DATA] &&
261 expr->ops->parse(expr, tb[NFTA_EXPR_DATA]) < 0)
272EXPORT_SYMBOL(nftnl_expr_snprintf);
273int nftnl_expr_snprintf(
char *buf,
size_t remain,
const struct nftnl_expr *expr,
274 uint32_t type, uint32_t flags)
277 unsigned int offset = 0;
282 if (!expr->ops->output || type != NFTNL_OUTPUT_DEFAULT)
285 ret = expr->ops->output(buf + offset, remain, flags, expr);
286 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
291static int nftnl_expr_do_snprintf(
char *buf,
size_t size,
const void *e,
292 uint32_t cmd, uint32_t type, uint32_t flags)
294 return nftnl_expr_snprintf(buf, size, e, type, flags);
297EXPORT_SYMBOL(nftnl_expr_fprintf);
298int nftnl_expr_fprintf(FILE *fp,
const struct nftnl_expr *expr, uint32_t type,
301 return nftnl_fprintf(fp, expr, NFTNL_CMD_UNSPEC, type, flags,
302 nftnl_expr_do_snprintf);