19#include <libmnl/libmnl.h>
21#include <linux/netfilter/nf_tables.h>
22#include <linux/netfilter/nf_tables_compat.h>
24#include <libnftnl/expr.h>
25#include <libnftnl/rule.h>
28#define XT_EXTENSION_MAXNAMELEN 29
31 char name[XT_EXTENSION_MAXNAMELEN];
38nftnl_expr_target_set(
struct nftnl_expr *e, uint16_t type,
39 const void *data, uint32_t data_len)
44 case NFTNL_EXPR_TG_NAME:
45 snprintf(tg->name,
sizeof(tg->name),
"%.*s", data_len,
48 case NFTNL_EXPR_TG_REV:
49 memcpy(&tg->rev, data,
sizeof(tg->rev));
51 case NFTNL_EXPR_TG_INFO:
52 if (e->flags & (1 << NFTNL_EXPR_TG_INFO))
56 tg->data_len = data_len;
65nftnl_expr_target_get(
const struct nftnl_expr *e, uint16_t type,
71 case NFTNL_EXPR_TG_NAME:
72 *data_len =
sizeof(tg->name);
74 case NFTNL_EXPR_TG_REV:
75 *data_len =
sizeof(tg->rev);
77 case NFTNL_EXPR_TG_INFO:
78 *data_len = tg->data_len;
84static int nftnl_expr_target_cb(
const struct nlattr *attr,
void *data)
86 const struct nlattr **tb = data;
87 int type = mnl_attr_get_type(attr);
89 if (mnl_attr_type_valid(attr, NFTA_TARGET_MAX) < 0)
93 case NFTA_TARGET_NAME:
94 if (mnl_attr_validate(attr, MNL_TYPE_NUL_STRING) < 0)
98 if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
101 case NFTA_TARGET_INFO:
102 if (mnl_attr_validate(attr, MNL_TYPE_BINARY) < 0)
112nftnl_expr_target_build(
struct nlmsghdr *nlh,
const struct nftnl_expr *e)
116 if (e->flags & (1 << NFTNL_EXPR_TG_NAME))
117 mnl_attr_put_strz(nlh, NFTA_TARGET_NAME, tg->name);
118 if (e->flags & (1 << NFTNL_EXPR_TG_REV))
119 mnl_attr_put_u32(nlh, NFTA_TARGET_REV, htonl(tg->rev));
120 if (e->flags & (1 << NFTNL_EXPR_TG_INFO))
121 mnl_attr_put(nlh, NFTA_TARGET_INFO, tg->data_len, tg->data);
124static int nftnl_expr_target_parse(
struct nftnl_expr *e,
struct nlattr *attr)
127 struct nlattr *tb[NFTA_TARGET_MAX+1] = {};
129 if (mnl_attr_parse_nested(attr, nftnl_expr_target_cb, tb) < 0)
132 if (tb[NFTA_TARGET_NAME]) {
133 snprintf(target->name, XT_EXTENSION_MAXNAMELEN,
"%s",
134 mnl_attr_get_str(tb[NFTA_TARGET_NAME]));
136 target->name[XT_EXTENSION_MAXNAMELEN-1] =
'\0';
137 e->flags |= (1 << NFTNL_EXPR_TG_NAME);
140 if (tb[NFTA_TARGET_REV]) {
141 target->rev = ntohl(mnl_attr_get_u32(tb[NFTA_TARGET_REV]));
142 e->flags |= (1 << NFTNL_EXPR_TG_REV);
145 if (tb[NFTA_TARGET_INFO]) {
146 uint32_t len = mnl_attr_get_payload_len(tb[NFTA_TARGET_INFO]);
152 target_data = calloc(1, len);
153 if (target_data == NULL)
156 memcpy(target_data, mnl_attr_get_payload(tb[NFTA_TARGET_INFO]), len);
158 target->data = target_data;
159 target->data_len = len;
161 e->flags |= (1 << NFTNL_EXPR_TG_INFO);
168nftnl_expr_target_snprintf(
char *buf,
size_t len,
169 uint32_t flags,
const struct nftnl_expr *e)
173 return snprintf(buf, len,
"name %s rev %u ", target->name, target->rev);
176static void nftnl_expr_target_free(
const struct nftnl_expr *e)
183struct expr_ops expr_ops_target = {
186 .max_attr = NFTA_TARGET_MAX,
187 .free = nftnl_expr_target_free,
188 .set = nftnl_expr_target_set,
189 .get = nftnl_expr_target_get,
190 .parse = nftnl_expr_target_parse,
191 .build = nftnl_expr_target_build,
192 .output = nftnl_expr_target_snprintf,