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>
23 #include <linux/netfilter/x_tables.h>
25 #include <libnftnl/expr.h>
26 #include <libnftnl/rule.h>
31 char name[XT_EXTENSION_MAXNAMELEN];
38 nft_rule_expr_target_set(
struct nft_rule_expr *e, uint16_t type,
39 const void *data, uint32_t data_len)
44 case NFT_EXPR_TG_NAME:
45 snprintf(tg->name,
sizeof(tg->name),
"%.*s", data_len,
49 tg->rev = *((uint32_t *)data);
51 case NFT_EXPR_TG_INFO:
56 tg->data_len = data_len;
65 nft_rule_expr_target_get(
const struct nft_rule_expr *e, uint16_t type,
71 case NFT_EXPR_TG_NAME:
72 *data_len =
sizeof(tg->name);
75 *data_len =
sizeof(tg->rev);
77 case NFT_EXPR_TG_INFO:
78 *data_len = tg->data_len;
84 static int nft_rule_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) {
95 perror(
"mnl_attr_validate");
100 if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0) {
101 perror(
"mnl_attr_validate");
105 case NFTA_TARGET_INFO:
106 if (mnl_attr_validate(attr, MNL_TYPE_BINARY) < 0) {
107 perror(
"mnl_attr_validate");
118 nft_rule_expr_target_build(
struct nlmsghdr *nlh,
struct nft_rule_expr *e)
122 if (e->flags & (1 << NFT_EXPR_TG_NAME))
123 mnl_attr_put_strz(nlh, NFTA_TARGET_NAME, tg->name);
124 if (e->flags & (1 << NFT_EXPR_TG_REV))
125 mnl_attr_put_u32(nlh, NFTA_TARGET_REV, htonl(tg->rev));
126 if (e->flags & (1 << NFT_EXPR_TG_INFO))
127 mnl_attr_put(nlh, NFTA_TARGET_INFO, tg->data_len, tg->data);
130 static int nft_rule_expr_target_parse(
struct nft_rule_expr *e,
struct nlattr *attr)
133 struct nlattr *tb[NFTA_TARGET_MAX+1] = {};
135 if (mnl_attr_parse_nested(attr, nft_rule_expr_target_cb, tb) < 0)
138 if (tb[NFTA_TARGET_NAME]) {
139 snprintf(target->name, XT_EXTENSION_MAXNAMELEN,
"%s",
140 mnl_attr_get_str(tb[NFTA_TARGET_NAME]));
142 target->name[XT_EXTENSION_MAXNAMELEN-1] =
'\0';
143 e->flags |= (1 << NFT_EXPR_TG_NAME);
146 if (tb[NFTA_TARGET_REV]) {
147 target->rev = ntohl(mnl_attr_get_u32(tb[NFTA_TARGET_REV]));
148 e->flags |= (1 << NFT_EXPR_TG_REV);
151 if (tb[NFTA_TARGET_INFO]) {
152 uint32_t len = mnl_attr_get_payload_len(tb[NFTA_TARGET_INFO]);
158 target_data = calloc(1, len);
159 if (target_data == NULL)
162 memcpy(target_data, mnl_attr_get_payload(tb[NFTA_TARGET_INFO]), len);
164 target->data = target_data;
165 target->data_len = len;
167 e->flags |= (1 << NFT_EXPR_TG_INFO);
174 nft_rule_expr_target_json_parse(
struct nft_rule_expr *e, json_t *root,
175 struct nft_parse_err *err)
180 name = nft_jansson_parse_str(root,
"name", err);
182 nft_rule_expr_set_str(e, NFT_EXPR_TG_NAME, name);
192 nft_rule_expr_target_xml_parse(
struct nft_rule_expr *e, mxml_node_t *tree,
193 struct nft_parse_err *err)
198 name = nft_mxml_str_parse(tree,
"name", MXML_DESCEND_FIRST,
201 nft_rule_expr_set_str(e, NFT_EXPR_TG_NAME, name);
212 static int nft_rule_exp_target_snprintf_json(
char *buf,
size_t len,
213 struct nft_rule_expr *e)
216 int ret, size = len, offset = 0;
218 if (e->flags & (1 << NFT_EXPR_TG_NAME)) {
219 ret = snprintf(buf, len,
"\"name\":\"%s\"", target->name);
220 SNPRINTF_BUFFER_SIZE(ret, size, len, offset);
226 static int nft_rule_exp_target_snprintf_xml(
char *buf,
size_t len,
227 struct nft_rule_expr *e)
233 if (e->flags & (1 << NFT_EXPR_TG_NAME)) {
234 ret = snprintf(buf, len,
"<name>%s</name>", target->name);
235 SNPRINTF_BUFFER_SIZE(ret, size, len, offset);
242 nft_rule_expr_target_snprintf(
char *buf,
size_t len, uint32_t type,
243 uint32_t flags,
struct nft_rule_expr *e)
248 case NFT_OUTPUT_DEFAULT:
249 return snprintf(buf, len,
"name %s rev %u ",
250 target->name, target->rev);
252 return nft_rule_exp_target_snprintf_xml(buf, len, e);
253 case NFT_OUTPUT_JSON:
254 return nft_rule_exp_target_snprintf_json(buf, len, e);
261 static void nft_rule_expr_target_free(
struct nft_rule_expr *e)
268 struct expr_ops expr_ops_target = {
271 .max_attr = NFTA_TARGET_MAX,
272 .free = nft_rule_expr_target_free,
273 .set = nft_rule_expr_target_set,
274 .get = nft_rule_expr_target_get,
275 .parse = nft_rule_expr_target_parse,
276 .build = nft_rule_expr_target_build,
277 .snprintf = nft_rule_expr_target_snprintf,
278 .xml_parse = nft_rule_expr_target_xml_parse,
279 .json_parse = nft_rule_expr_target_json_parse,
282 static void __init expr_target_init(
void)
284 nft_expr_ops_register(&expr_ops_target);