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_match_set(
struct nft_rule_expr *e, uint16_t type,
39 const void *data, uint32_t data_len)
44 case NFT_EXPR_MT_NAME:
45 snprintf(mt->name,
sizeof(mt->name),
"%.*s", data_len,
49 mt->rev = *((uint32_t *)data);
51 case NFT_EXPR_MT_INFO:
56 mt->data_len = data_len;
65 nft_rule_expr_match_get(
const struct nft_rule_expr *e, uint16_t type,
71 case NFT_EXPR_MT_NAME:
72 *data_len =
sizeof(mt->name);
75 *data_len =
sizeof(mt->rev);
77 case NFT_EXPR_MT_INFO:
78 *data_len = mt->data_len;
84 static int nft_rule_expr_match_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_MATCH_MAX) < 0)
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_MATCH_INFO:
106 if (mnl_attr_validate(attr, MNL_TYPE_BINARY) < 0) {
107 perror(
"mnl_attr_validate");
118 nft_rule_expr_match_build(
struct nlmsghdr *nlh,
struct nft_rule_expr *e)
122 if (e->flags & (1 << NFT_EXPR_MT_NAME))
123 mnl_attr_put_strz(nlh, NFTA_MATCH_NAME, mt->name);
124 if (e->flags & (1 << NFT_EXPR_MT_REV))
125 mnl_attr_put_u32(nlh, NFTA_MATCH_REV, htonl(mt->rev));
126 if (e->flags & (1 << NFT_EXPR_MT_INFO))
127 mnl_attr_put(nlh, NFTA_MATCH_INFO, mt->data_len, mt->data);
130 static int nft_rule_expr_match_parse(
struct nft_rule_expr *e,
struct nlattr *attr)
133 struct nlattr *tb[NFTA_MATCH_MAX+1] = {};
135 if (mnl_attr_parse_nested(attr, nft_rule_expr_match_cb, tb) < 0)
138 if (tb[NFTA_MATCH_NAME]) {
139 snprintf(match->name, XT_EXTENSION_MAXNAMELEN,
"%s",
140 mnl_attr_get_str(tb[NFTA_MATCH_NAME]));
142 match->name[XT_EXTENSION_MAXNAMELEN-1] =
'\0';
143 e->flags |= (1 << NFT_EXPR_MT_NAME);
146 if (tb[NFTA_MATCH_REV]) {
147 match->rev = ntohl(mnl_attr_get_u32(tb[NFTA_MATCH_REV]));
148 e->flags |= (1 << NFT_EXPR_MT_REV);
151 if (tb[NFTA_MATCH_INFO]) {
152 uint32_t len = mnl_attr_get_payload_len(tb[NFTA_MATCH_INFO]);
158 match_data = calloc(1, len);
159 if (match_data == NULL)
162 memcpy(match_data, mnl_attr_get_payload(tb[NFTA_MATCH_INFO]), len);
164 match->data = match_data;
165 match->data_len = len;
167 e->flags |= (1 << NFT_EXPR_MT_INFO);
173 static int nft_rule_expr_match_json_parse(
struct nft_rule_expr *e, json_t *root,
174 struct nft_parse_err *err)
179 name = nft_jansson_parse_str(root,
"name", err);
181 nft_rule_expr_set_str(e, NFT_EXPR_MT_NAME, name);
191 static int nft_rule_expr_match_xml_parse(
struct nft_rule_expr *e, mxml_node_t *tree,
192 struct nft_parse_err *err)
197 name = nft_mxml_str_parse(tree,
"name", MXML_DESCEND_FIRST,
200 nft_rule_expr_set_str(e, NFT_EXPR_MT_NAME, name);
211 static int nft_rule_expr_match_snprintf_json(
char *buf,
size_t len,
212 struct nft_rule_expr *e)
215 int ret, size = len, offset = 0;
217 if (e->flags & (1 << NFT_EXPR_MT_NAME)) {
218 ret = snprintf(buf, len,
"\"name\":\"%s\"", mt->name);
219 SNPRINTF_BUFFER_SIZE(ret, size, len, offset);
225 static int nft_rule_expr_match_snprintf_xml(
char *buf,
size_t len,
226 struct nft_rule_expr *e)
232 if (e->flags & (1 << NFT_EXPR_MT_NAME)) {
233 ret = snprintf(buf, len,
"<name>%s</name>", mt->name);
234 SNPRINTF_BUFFER_SIZE(ret, size, len, offset);
241 nft_rule_expr_match_snprintf(
char *buf,
size_t len, uint32_t type,
242 uint32_t flags,
struct nft_rule_expr *e)
247 case NFT_OUTPUT_DEFAULT:
248 return snprintf(buf, len,
"name %s rev %u ",
249 match->name, match->rev);
251 return nft_rule_expr_match_snprintf_xml(buf, len, e);
252 case NFT_OUTPUT_JSON:
253 return nft_rule_expr_match_snprintf_json(buf, len, e);
260 static void nft_rule_expr_match_free(
struct nft_rule_expr *e)
267 struct expr_ops expr_ops_match = {
270 .max_attr = NFTA_MATCH_MAX,
271 .free = nft_rule_expr_match_free,
272 .set = nft_rule_expr_match_set,
273 .get = nft_rule_expr_match_get,
274 .parse = nft_rule_expr_match_parse,
275 .build = nft_rule_expr_match_build,
276 .snprintf = nft_rule_expr_match_snprintf,
277 .xml_parse = nft_rule_expr_match_xml_parse,
278 .json_parse = nft_rule_expr_match_json_parse,
281 static void __init expr_match_init(
void)
283 nft_expr_ops_register(&expr_ops_match);