17 #include <arpa/inet.h>
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];
38 nftnl_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, data_len);
51 case NFTNL_EXPR_TG_INFO:
52 if (e->flags & (1 << NFTNL_EXPR_TG_INFO))
56 tg->data_len = data_len;
63 nftnl_expr_target_get(
const struct nftnl_expr *e, uint16_t type,
69 case NFTNL_EXPR_TG_NAME:
70 *data_len =
sizeof(tg->name);
72 case NFTNL_EXPR_TG_REV:
73 *data_len =
sizeof(tg->rev);
75 case NFTNL_EXPR_TG_INFO:
76 *data_len = tg->data_len;
82 static int nftnl_expr_target_cb(
const struct nlattr *attr,
void *data)
84 const struct nlattr **tb = data;
85 int type = mnl_attr_get_type(attr);
87 if (mnl_attr_type_valid(attr, NFTA_TARGET_MAX) < 0)
91 case NFTA_TARGET_NAME:
92 if (mnl_attr_validate(attr, MNL_TYPE_NUL_STRING) < 0)
96 if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
99 case NFTA_TARGET_INFO:
100 if (mnl_attr_validate(attr, MNL_TYPE_BINARY) < 0)
110 nftnl_expr_target_build(
struct nlmsghdr *nlh,
const struct nftnl_expr *e)
114 if (e->flags & (1 << NFTNL_EXPR_TG_NAME))
115 mnl_attr_put_strz(nlh, NFTA_TARGET_NAME, tg->name);
116 if (e->flags & (1 << NFTNL_EXPR_TG_REV))
117 mnl_attr_put_u32(nlh, NFTA_TARGET_REV, htonl(tg->rev));
118 if (e->flags & (1 << NFTNL_EXPR_TG_INFO))
119 mnl_attr_put(nlh, NFTA_TARGET_INFO, tg->data_len, tg->data);
122 static int nftnl_expr_target_parse(
struct nftnl_expr *e,
struct nlattr *attr)
125 struct nlattr *tb[NFTA_TARGET_MAX+1] = {};
127 if (mnl_attr_parse_nested(attr, nftnl_expr_target_cb, tb) < 0)
130 if (tb[NFTA_TARGET_NAME]) {
131 snprintf(target->name, XT_EXTENSION_MAXNAMELEN,
"%s",
132 mnl_attr_get_str(tb[NFTA_TARGET_NAME]));
134 target->name[XT_EXTENSION_MAXNAMELEN-1] =
'\0';
135 e->flags |= (1 << NFTNL_EXPR_TG_NAME);
138 if (tb[NFTA_TARGET_REV]) {
139 target->rev = ntohl(mnl_attr_get_u32(tb[NFTA_TARGET_REV]));
140 e->flags |= (1 << NFTNL_EXPR_TG_REV);
143 if (tb[NFTA_TARGET_INFO]) {
144 uint32_t len = mnl_attr_get_payload_len(tb[NFTA_TARGET_INFO]);
150 target_data = calloc(1, len);
151 if (target_data == NULL)
154 memcpy(target_data, mnl_attr_get_payload(tb[NFTA_TARGET_INFO]), len);
156 target->data = target_data;
157 target->data_len = len;
159 e->flags |= (1 << NFTNL_EXPR_TG_INFO);
166 nftnl_expr_target_snprintf(
char *buf,
size_t len,
167 uint32_t flags,
const struct nftnl_expr *e)
171 return snprintf(buf, len,
"name %s rev %u ", target->name, target->rev);
174 static void nftnl_expr_target_free(
const struct nftnl_expr *e)
181 static struct attr_policy target_attr_policy[__NFTNL_EXPR_TG_MAX] = {
182 [NFTNL_EXPR_TG_NAME] = { .maxlen = XT_EXTENSION_MAXNAMELEN },
183 [NFTNL_EXPR_TG_REV] = { .maxlen =
sizeof(uint32_t) },
184 [NFTNL_EXPR_TG_INFO] = { .maxlen = 0 },
187 struct expr_ops expr_ops_target = {
190 .nftnl_max_attr = __NFTNL_EXPR_TG_MAX - 1,
191 .attr_policy = target_attr_policy,
192 .free = nftnl_expr_target_free,
193 .set = nftnl_expr_target_set,
194 .get = nftnl_expr_target_get,
195 .parse = nftnl_expr_target_parse,
196 .build = nftnl_expr_target_build,
197 .output = nftnl_expr_target_snprintf,