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>
30 static int nft_rule_expr_reject_set(
struct nft_rule_expr *e, uint16_t type,
31 const void *data, uint32_t data_len)
36 case NFT_EXPR_REJECT_TYPE:
37 reject->type = *((uint32_t *)data);
39 case NFT_EXPR_REJECT_CODE:
40 reject->icmp_code = *((uint8_t *)data);
49 nft_rule_expr_reject_get(
const struct nft_rule_expr *e, uint16_t type,
55 case NFT_EXPR_REJECT_TYPE:
56 *data_len =
sizeof(reject->type);
58 case NFT_EXPR_REJECT_CODE:
59 *data_len =
sizeof(reject->icmp_code);
60 return &reject->icmp_code;
65 static int nft_rule_expr_reject_cb(
const struct nlattr *attr,
void *data)
67 const struct nlattr **tb = data;
68 int type = mnl_attr_get_type(attr);
70 if (mnl_attr_type_valid(attr, NFTA_REJECT_MAX) < 0)
74 case NFTA_REJECT_TYPE:
75 if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0) {
76 perror(
"mnl_attr_validate");
80 case NFTA_REJECT_ICMP_CODE:
81 if (mnl_attr_validate(attr, MNL_TYPE_U8) < 0) {
82 perror(
"mnl_attr_validate");
93 nft_rule_expr_reject_build(
struct nlmsghdr *nlh,
struct nft_rule_expr *e)
97 if (e->flags & (1 << NFT_EXPR_REJECT_TYPE))
98 mnl_attr_put_u32(nlh, NFTA_REJECT_TYPE, htonl(reject->type));
99 if (e->flags & (1 << NFT_EXPR_REJECT_CODE))
100 mnl_attr_put_u8(nlh, NFTA_REJECT_ICMP_CODE, reject->icmp_code);
104 nft_rule_expr_reject_parse(
struct nft_rule_expr *e,
struct nlattr *attr)
107 struct nlattr *tb[NFTA_REJECT_MAX+1] = {};
109 if (mnl_attr_parse_nested(attr, nft_rule_expr_reject_cb, tb) < 0)
112 if (tb[NFTA_REJECT_TYPE]) {
113 reject->type = ntohl(mnl_attr_get_u32(tb[NFTA_REJECT_TYPE]));
114 e->flags |= (1 << NFT_EXPR_REJECT_TYPE);
116 if (tb[NFTA_REJECT_ICMP_CODE]) {
117 reject->icmp_code = mnl_attr_get_u8(tb[NFTA_REJECT_ICMP_CODE]);
118 e->flags |= (1 << NFT_EXPR_REJECT_CODE);
125 nft_rule_expr_reject_json_parse(
struct nft_rule_expr *e, json_t *root,
126 struct nft_parse_err *err)
132 if (nft_jansson_parse_val(root,
"type", NFT_TYPE_U32, &type, err) == 0)
133 nft_rule_expr_set_u32(e, NFT_EXPR_REJECT_TYPE, type);
135 if (nft_jansson_parse_val(root,
"code", NFT_TYPE_U8, &code, err) == 0)
136 nft_rule_expr_set_u8(e, NFT_EXPR_REJECT_CODE, code);
146 nft_rule_expr_reject_xml_parse(
struct nft_rule_expr *e, mxml_node_t *tree,
147 struct nft_parse_err *err)
153 if (nft_mxml_num_parse(tree,
"type", MXML_DESCEND_FIRST, BASE_DEC,
154 &type, NFT_TYPE_U32, NFT_XML_MAND, err) == 0)
155 nft_rule_expr_set_u32(e, NFT_EXPR_REJECT_TYPE, type);
157 if (nft_mxml_num_parse(tree,
"code", MXML_DESCEND_FIRST, BASE_DEC,
158 &code, NFT_TYPE_U8, NFT_XML_MAND, err) == 0)
159 nft_rule_expr_set_u8(e, NFT_EXPR_REJECT_CODE, code);
168 static int nft_rule_expr_reject_snprintf_default(
char *buf,
size_t len,
169 struct nft_rule_expr *e)
173 return snprintf(buf, len,
"type %u code %u ",
174 reject->type, reject->icmp_code);
177 static int nft_rule_expr_reject_snprintf_xml(
char *buf,
size_t len,
178 struct nft_rule_expr *e)
180 int ret, size = len, offset = 0;
183 if (e->flags & (1 << NFT_EXPR_REJECT_TYPE)) {
184 ret = snprintf(buf+offset, len,
"<type>%u</type>",
186 SNPRINTF_BUFFER_SIZE(ret, size, len, offset);
188 if (e->flags & (1 << NFT_EXPR_REJECT_CODE)) {
189 ret = snprintf(buf+offset, len,
"<code>%u</code>",
191 SNPRINTF_BUFFER_SIZE(ret, size, len, offset);
197 static int nft_rule_expr_reject_snprintf_json(
char *buf,
size_t len,
198 struct nft_rule_expr *e)
200 int ret, size = len, offset = 0;
203 if (e->flags & (1 << NFT_EXPR_REJECT_TYPE)) {
204 ret = snprintf(buf+offset, len,
"\"type\":%u,",
206 SNPRINTF_BUFFER_SIZE(ret, size, len, offset);
208 if (e->flags & (1 << NFT_EXPR_REJECT_CODE)) {
209 ret = snprintf(buf+offset, len,
"\"code\":%u,",
211 SNPRINTF_BUFFER_SIZE(ret, size, len, offset);
221 nft_rule_expr_reject_snprintf(
char *buf,
size_t len, uint32_t type,
222 uint32_t flags,
struct nft_rule_expr *e)
225 case NFT_OUTPUT_DEFAULT:
226 return nft_rule_expr_reject_snprintf_default(buf, len, e);
228 return nft_rule_expr_reject_snprintf_xml(buf, len, e);
229 case NFT_OUTPUT_JSON:
230 return nft_rule_expr_reject_snprintf_json(buf, len, e);
237 struct expr_ops expr_ops_reject = {
240 .max_attr = NFTA_REJECT_MAX,
241 .set = nft_rule_expr_reject_set,
242 .get = nft_rule_expr_reject_get,
243 .parse = nft_rule_expr_reject_parse,
244 .build = nft_rule_expr_reject_build,
245 .snprintf = nft_rule_expr_reject_snprintf,
246 .xml_parse = nft_rule_expr_reject_xml_parse,
247 .json_parse = nft_rule_expr_reject_json_parse,
250 static void __init expr_reject_init(
void)
252 nft_expr_ops_register(&expr_ops_reject);