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>
27 EXPORT_SYMBOL(nftnl_expr_alloc);
28 struct 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);
48 EXPORT_SYMBOL(nftnl_expr_free);
49 void nftnl_expr_free(
const struct nftnl_expr *expr)
52 expr->ops->free(expr);
57 EXPORT_SYMBOL(nftnl_expr_is_set);
58 bool nftnl_expr_is_set(
const struct nftnl_expr *expr, uint16_t type)
60 return expr->flags & (1 << type);
63 EXPORT_SYMBOL(nftnl_expr_set);
64 int nftnl_expr_set(
struct nftnl_expr *expr, uint16_t type,
65 const void *data, uint32_t data_len)
71 if (expr->ops->set(expr, type, data, data_len) < 0)
74 expr->flags |= (1 << type);
78 EXPORT_SYMBOL(nftnl_expr_set_u8);
80 nftnl_expr_set_u8(
struct nftnl_expr *expr, uint16_t type, uint8_t data)
82 nftnl_expr_set(expr, type, &data,
sizeof(uint8_t));
85 EXPORT_SYMBOL(nftnl_expr_set_u16);
87 nftnl_expr_set_u16(
struct nftnl_expr *expr, uint16_t type, uint16_t data)
89 nftnl_expr_set(expr, type, &data,
sizeof(uint16_t));
92 EXPORT_SYMBOL(nftnl_expr_set_u32);
94 nftnl_expr_set_u32(
struct nftnl_expr *expr, uint16_t type, uint32_t data)
96 nftnl_expr_set(expr, type, &data,
sizeof(uint32_t));
99 EXPORT_SYMBOL(nftnl_expr_set_u64);
101 nftnl_expr_set_u64(
struct nftnl_expr *expr, uint16_t type, uint64_t data)
103 nftnl_expr_set(expr, type, &data,
sizeof(uint64_t));
106 EXPORT_SYMBOL(nftnl_expr_set_str);
107 int nftnl_expr_set_str(
struct nftnl_expr *expr, uint16_t type,
const char *str)
109 return nftnl_expr_set(expr, type, str, strlen(str) + 1);
112 EXPORT_SYMBOL(nftnl_expr_get);
113 const void *nftnl_expr_get(
const struct nftnl_expr *expr,
114 uint16_t type, uint32_t *data_len)
118 if (!(expr->flags & (1 << type)))
122 case NFTNL_EXPR_NAME:
123 *data_len = strlen(expr->ops->name) + 1;
124 ret = expr->ops->name;
127 ret = expr->ops->get(expr, type, data_len);
134 EXPORT_SYMBOL(nftnl_expr_get_u8);
135 uint8_t nftnl_expr_get_u8(
const struct nftnl_expr *expr, uint16_t type)
140 data = nftnl_expr_get(expr, type, &data_len);
144 if (data_len !=
sizeof(uint8_t))
147 return *((uint8_t *)data);
150 EXPORT_SYMBOL(nftnl_expr_get_u16);
151 uint16_t nftnl_expr_get_u16(
const struct nftnl_expr *expr, uint16_t type)
156 data = nftnl_expr_get(expr, type, &data_len);
160 if (data_len !=
sizeof(uint16_t))
163 return *((uint16_t *)data);
166 EXPORT_SYMBOL(nftnl_expr_get_u32);
167 uint32_t nftnl_expr_get_u32(
const struct nftnl_expr *expr, uint16_t type)
172 data = nftnl_expr_get(expr, type, &data_len);
176 if (data_len !=
sizeof(uint32_t))
179 return *((uint32_t *)data);
182 EXPORT_SYMBOL(nftnl_expr_get_u64);
183 uint64_t nftnl_expr_get_u64(
const struct nftnl_expr *expr, uint16_t type)
188 data = nftnl_expr_get(expr, type, &data_len);
192 if (data_len !=
sizeof(uint64_t))
195 return *((uint64_t *)data);
198 EXPORT_SYMBOL(nftnl_expr_get_str);
199 const char *nftnl_expr_get_str(
const struct nftnl_expr *expr, uint16_t type)
203 return (
const char *)nftnl_expr_get(expr, type, &data_len);
206 void nftnl_expr_build_payload(
struct nlmsghdr *nlh,
struct nftnl_expr *expr)
210 mnl_attr_put_strz(nlh, NFTA_EXPR_NAME, expr->ops->name);
212 if (!expr->ops->build)
215 nest = mnl_attr_nest_start(nlh, NFTA_EXPR_DATA);
216 expr->ops->build(nlh, expr);
217 mnl_attr_nest_end(nlh, nest);
220 static int nftnl_rule_parse_expr_cb(
const struct nlattr *attr,
void *data)
222 const struct nlattr **tb = data;
223 int type = mnl_attr_get_type(attr);
225 if (mnl_attr_type_valid(attr, NFTA_EXPR_MAX) < 0)
230 if (mnl_attr_validate(attr, MNL_TYPE_STRING) < 0)
234 if (mnl_attr_validate(attr, MNL_TYPE_NESTED) < 0)
243 struct nftnl_expr *nftnl_expr_parse(
struct nlattr *attr)
245 struct nlattr *tb[NFTA_EXPR_MAX+1] = {};
246 struct nftnl_expr *expr;
248 if (mnl_attr_parse_nested(attr, nftnl_rule_parse_expr_cb, tb) < 0)
251 expr = nftnl_expr_alloc(mnl_attr_get_str(tb[NFTA_EXPR_NAME]));
255 if (tb[NFTA_EXPR_DATA] &&
257 expr->ops->parse(expr, tb[NFTA_EXPR_DATA]) < 0)
268 EXPORT_SYMBOL(nftnl_expr_snprintf);
269 int nftnl_expr_snprintf(
char *buf,
size_t size,
const struct nftnl_expr *expr,
270 uint32_t type, uint32_t flags)
273 unsigned int offset = 0, remain = size;
278 if (!expr->ops->snprintf)
281 ret = expr->ops->snprintf(buf + offset, remain, type, flags, expr);
282 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
287 static int nftnl_expr_do_snprintf(
char *buf,
size_t size,
const void *e,
288 uint32_t cmd, uint32_t type, uint32_t flags)
290 return nftnl_expr_snprintf(buf, size, e, type, flags);
293 EXPORT_SYMBOL(nftnl_expr_fprintf);
294 int nftnl_expr_fprintf(FILE *fp,
const struct nftnl_expr *expr, uint32_t type,
297 return nftnl_fprintf(fp, expr, NFTNL_CMD_UNSPEC, type, flags,
298 nftnl_expr_do_snprintf);