15 #include <arpa/inet.h>
17 #include <linux/netfilter/nf_tables.h>
20 #include <libmnl/libmnl.h>
21 #include <libnftnl/expr.h>
22 #include <libnftnl/rule.h>
26 #define NFT_META_MAX (NFT_META_BRI_OIFNAME + 1)
30 enum nft_meta_keys key;
31 enum nft_registers dreg;
32 enum nft_registers sreg;
36 nft_rule_expr_meta_set(
struct nft_rule_expr *e, uint16_t type,
37 const void *data, uint32_t data_len)
42 case NFT_EXPR_META_KEY:
43 meta->key = *((uint32_t *)data);
45 case NFT_EXPR_META_DREG:
46 meta->dreg = *((uint32_t *)data);
48 case NFT_EXPR_META_SREG:
49 meta->sreg = *((uint32_t *)data);
58 nft_rule_expr_meta_get(
const struct nft_rule_expr *e, uint16_t type,
64 case NFT_EXPR_META_KEY:
65 *data_len =
sizeof(meta->key);
67 case NFT_EXPR_META_DREG:
68 *data_len =
sizeof(meta->dreg);
70 case NFT_EXPR_META_SREG:
71 *data_len =
sizeof(meta->sreg);
77 static int nft_rule_expr_meta_cb(
const struct nlattr *attr,
void *data)
79 const struct nlattr **tb = data;
80 int type = mnl_attr_get_type(attr);
82 if (mnl_attr_type_valid(attr, NFTA_META_MAX) < 0)
89 if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0) {
90 perror(
"mnl_attr_validate");
101 nft_rule_expr_meta_build(
struct nlmsghdr *nlh,
struct nft_rule_expr *e)
105 if (e->flags & (1 << NFT_EXPR_META_KEY))
106 mnl_attr_put_u32(nlh, NFTA_META_KEY, htonl(meta->key));
107 if (e->flags & (1 << NFT_EXPR_META_DREG))
108 mnl_attr_put_u32(nlh, NFTA_META_DREG, htonl(meta->dreg));
109 if (e->flags & (1 << NFT_EXPR_META_SREG))
110 mnl_attr_put_u32(nlh, NFTA_META_SREG, htonl(meta->sreg));
114 nft_rule_expr_meta_parse(
struct nft_rule_expr *e,
struct nlattr *attr)
117 struct nlattr *tb[NFTA_META_MAX+1] = {};
119 if (mnl_attr_parse_nested(attr, nft_rule_expr_meta_cb, tb) < 0)
122 if (tb[NFTA_META_KEY]) {
123 meta->key = ntohl(mnl_attr_get_u32(tb[NFTA_META_KEY]));
124 e->flags |= (1 << NFT_EXPR_META_KEY);
126 if (tb[NFTA_META_DREG]) {
127 meta->dreg = ntohl(mnl_attr_get_u32(tb[NFTA_META_DREG]));
128 e->flags |= (1 << NFT_EXPR_META_DREG);
130 if (tb[NFTA_META_SREG]) {
131 meta->sreg = ntohl(mnl_attr_get_u32(tb[NFTA_META_SREG]));
132 e->flags |= (1 << NFT_EXPR_META_SREG);
138 static const char *meta_key2str_array[NFT_META_MAX] = {
139 [NFT_META_LEN] =
"len",
140 [NFT_META_PROTOCOL] =
"protocol",
141 [NFT_META_NFPROTO] =
"nfproto",
142 [NFT_META_L4PROTO] =
"l4proto",
143 [NFT_META_PRIORITY] =
"priority",
144 [NFT_META_MARK] =
"mark",
145 [NFT_META_IIF] =
"iif",
146 [NFT_META_OIF] =
"oif",
147 [NFT_META_IIFNAME] =
"iifname",
148 [NFT_META_OIFNAME] =
"oifname",
149 [NFT_META_IIFTYPE] =
"iiftype",
150 [NFT_META_OIFTYPE] =
"oiftype",
151 [NFT_META_SKUID] =
"skuid",
152 [NFT_META_SKGID] =
"skgid",
153 [NFT_META_NFTRACE] =
"nftrace",
154 [NFT_META_RTCLASSID] =
"rtclassid",
155 [NFT_META_SECMARK] =
"secmark",
156 [NFT_META_BRI_IIFNAME] =
"bri_iifname",
157 [NFT_META_BRI_OIFNAME] =
"bri_oifname",
160 static const char *meta_key2str(uint8_t key)
162 if (key < NFT_META_MAX)
163 return meta_key2str_array[key];
168 static inline int str2meta_key(
const char *str)
172 for (i = 0; i < NFT_META_MAX; i++) {
173 if (strcmp(str, meta_key2str_array[i]) == 0)
181 static int nft_rule_expr_meta_json_parse(
struct nft_rule_expr *e, json_t *root,
182 struct nft_parse_err *err)
189 key_str = nft_jansson_parse_str(root,
"key", err);
190 if (key_str != NULL) {
191 key = str2meta_key(key_str);
193 nft_rule_expr_set_u32(e, NFT_EXPR_META_KEY, key);
196 if (nft_jansson_node_exist(root,
"dreg")) {
197 if (nft_jansson_parse_reg(root,
"dreg", NFT_TYPE_U32, ®,
199 nft_rule_expr_set_u32(e, NFT_EXPR_META_DREG, reg);
202 if (nft_jansson_node_exist(root,
"sreg")) {
203 if (nft_jansson_parse_reg(root,
"sreg", NFT_TYPE_U32, ®,
205 nft_rule_expr_set_u32(e, NFT_EXPR_META_SREG, reg);
216 static int nft_rule_expr_meta_xml_parse(
struct nft_rule_expr *e, mxml_node_t *tree,
217 struct nft_parse_err *err)
224 key_str = nft_mxml_str_parse(tree,
"key", MXML_DESCEND_FIRST,
226 if (key_str != NULL) {
227 key = str2meta_key(key_str);
229 nft_rule_expr_set_u32(e, NFT_EXPR_META_KEY, key);
232 if (nft_mxml_reg_parse(tree,
"dreg", &dreg, MXML_DESCEND_FIRST,
233 NFT_XML_OPT, err) == 0)
234 nft_rule_expr_set_u32(e, NFT_EXPR_META_DREG, dreg);
236 if (nft_mxml_reg_parse(tree,
"sreg", &sreg, MXML_DESCEND_FIRST,
237 NFT_XML_OPT, err) == 0)
238 nft_rule_expr_set_u32(e, NFT_EXPR_META_SREG, sreg);
248 nft_rule_expr_meta_snprintf_default(
char *buf,
size_t len,
249 struct nft_rule_expr *e)
253 if (e->flags & (1 << NFT_EXPR_META_SREG)) {
254 return snprintf(buf, len,
"set %s with reg %u ",
255 meta_key2str(meta->key), meta->sreg);
257 if (e->flags & (1 << NFT_EXPR_META_DREG)) {
258 return snprintf(buf, len,
"load %s => reg %u ",
259 meta_key2str(meta->key), meta->dreg);
265 nft_rule_expr_meta_snprintf_xml(
char *buf,
size_t size,
266 struct nft_rule_expr *e)
268 int ret, len = size, offset = 0;
271 if (e->flags & (1 << NFT_EXPR_META_DREG)) {
272 ret = snprintf(buf, len,
"<dreg>%u</dreg>", meta->dreg);
273 SNPRINTF_BUFFER_SIZE(ret, size, len, offset);
275 if (e->flags & (1 << NFT_EXPR_META_KEY)) {
276 ret = snprintf(buf + offset, len,
"<key>%s</key>",
277 meta_key2str(meta->key));
278 SNPRINTF_BUFFER_SIZE(ret, size, len, offset);
280 if (e->flags & (1 << NFT_EXPR_META_SREG)) {
281 ret = snprintf(buf + offset, len,
"<sreg>%u</sreg>",
283 SNPRINTF_BUFFER_SIZE(ret, size, len, offset);
290 nft_rule_expr_meta_snprintf_json(
char *buf,
size_t size,
291 struct nft_rule_expr *e)
293 int ret, len = size, offset = 0;
296 if (e->flags & (1 << NFT_EXPR_META_DREG)) {
297 ret = snprintf(buf + offset, len,
"\"dreg\":%u,",
299 SNPRINTF_BUFFER_SIZE(ret, size, len, offset);
301 if (e->flags & (1 << NFT_EXPR_META_KEY)) {
302 ret = snprintf(buf + offset, len,
"\"key\":\"%s\",",
303 meta_key2str(meta->key));
304 SNPRINTF_BUFFER_SIZE(ret, size, len, offset);
306 if (e->flags & (1 << NFT_EXPR_META_SREG)) {
307 ret = snprintf(buf + offset, len,
"\"sreg\":%u,",
309 SNPRINTF_BUFFER_SIZE(ret, size, len, offset);
319 nft_rule_expr_meta_snprintf(
char *buf,
size_t len, uint32_t type,
320 uint32_t flags,
struct nft_rule_expr *e)
323 case NFT_OUTPUT_DEFAULT:
324 return nft_rule_expr_meta_snprintf_default(buf, len, e);
326 return nft_rule_expr_meta_snprintf_xml(buf, len, e);
327 case NFT_OUTPUT_JSON:
328 return nft_rule_expr_meta_snprintf_json(buf, len, e);
335 struct expr_ops expr_ops_meta = {
338 .max_attr = NFTA_META_MAX,
339 .set = nft_rule_expr_meta_set,
340 .get = nft_rule_expr_meta_get,
341 .parse = nft_rule_expr_meta_parse,
342 .build = nft_rule_expr_meta_build,
343 .snprintf = nft_rule_expr_meta_snprintf,
344 .xml_parse = nft_rule_expr_meta_xml_parse,
345 .json_parse = nft_rule_expr_meta_json_parse,
348 static void __init expr_meta_init(
void)
350 nft_expr_ops_register(&expr_ops_meta);