15 #include <arpa/inet.h>
18 #include <libmnl/libmnl.h>
19 #include <linux/netfilter/nf_tables.h>
20 #include <libnftnl/expr.h>
21 #include <libnftnl/rule.h>
24 union nftnl_data_reg data;
25 enum nft_registers dreg;
29 nftnl_expr_immediate_set(
struct nftnl_expr *e, uint16_t type,
30 const void *data, uint32_t data_len)
35 case NFTNL_EXPR_IMM_DREG:
36 imm->dreg = *((uint32_t *)data);
38 case NFTNL_EXPR_IMM_DATA:
39 memcpy(&imm->data.val, data, data_len);
40 imm->data.len = data_len;
42 case NFTNL_EXPR_IMM_VERDICT:
43 imm->data.verdict = *((uint32_t *)data);
45 case NFTNL_EXPR_IMM_CHAIN:
47 xfree(imm->data.chain);
49 imm->data.chain = strdup(data);
58 nftnl_expr_immediate_get(
const struct nftnl_expr *e, uint16_t type,
64 case NFTNL_EXPR_IMM_DREG:
65 *data_len =
sizeof(imm->dreg);
67 case NFTNL_EXPR_IMM_DATA:
68 *data_len = imm->data.len;
69 return &imm->data.val;
70 case NFTNL_EXPR_IMM_VERDICT:
71 *data_len =
sizeof(imm->data.verdict);
72 return &imm->data.verdict;
73 case NFTNL_EXPR_IMM_CHAIN:
74 *data_len = strlen(imm->data.chain)+1;
75 return imm->data.chain;
80 static int nftnl_expr_immediate_cb(
const struct nlattr *attr,
void *data)
82 const struct nlattr **tb = data;
83 int type = mnl_attr_get_type(attr);
85 if (mnl_attr_type_valid(attr, NFTA_IMMEDIATE_MAX) < 0)
89 case NFTA_IMMEDIATE_DREG:
90 if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
93 case NFTA_IMMEDIATE_DATA:
94 if (mnl_attr_validate(attr, MNL_TYPE_BINARY) < 0)
104 nftnl_expr_immediate_build(
struct nlmsghdr *nlh,
struct nftnl_expr *e)
108 if (e->flags & (1 << NFTNL_EXPR_IMM_DREG))
109 mnl_attr_put_u32(nlh, NFTA_IMMEDIATE_DREG, htonl(imm->dreg));
112 if (e->flags & (1 << NFTNL_EXPR_IMM_DATA)) {
115 nest = mnl_attr_nest_start(nlh, NFTA_IMMEDIATE_DATA);
116 mnl_attr_put(nlh, NFTA_DATA_VALUE, imm->data.len, imm->data.val);
117 mnl_attr_nest_end(nlh, nest);
119 }
else if (e->flags & (1 << NFTNL_EXPR_IMM_VERDICT)) {
120 struct nlattr *nest1, *nest2;
122 nest1 = mnl_attr_nest_start(nlh, NFTA_IMMEDIATE_DATA);
123 nest2 = mnl_attr_nest_start(nlh, NFTA_DATA_VERDICT);
124 mnl_attr_put_u32(nlh, NFTA_VERDICT_CODE, htonl(imm->data.verdict));
125 if (e->flags & (1 << NFTNL_EXPR_IMM_CHAIN))
126 mnl_attr_put_strz(nlh, NFTA_VERDICT_CHAIN, imm->data.chain);
128 mnl_attr_nest_end(nlh, nest1);
129 mnl_attr_nest_end(nlh, nest2);
134 nftnl_expr_immediate_parse(
struct nftnl_expr *e,
struct nlattr *attr)
137 struct nlattr *tb[NFTA_IMMEDIATE_MAX+1] = {};
140 if (mnl_attr_parse_nested(attr, nftnl_expr_immediate_cb, tb) < 0)
143 if (tb[NFTA_IMMEDIATE_DREG]) {
144 imm->dreg = ntohl(mnl_attr_get_u32(tb[NFTA_IMMEDIATE_DREG]));
145 e->flags |= (1 << NFTNL_EXPR_IMM_DREG);
147 if (tb[NFTA_IMMEDIATE_DATA]) {
150 ret = nftnl_parse_data(&imm->data, tb[NFTA_IMMEDIATE_DATA], &type);
157 e->flags |= (1 << NFTNL_EXPR_IMM_DATA);
161 e->flags |= (1 << NFTNL_EXPR_IMM_VERDICT);
165 e->flags |= (1 << NFTNL_EXPR_IMM_VERDICT) |
166 (1 << NFTNL_EXPR_IMM_CHAIN);
175 nftnl_expr_immediate_json_parse(
struct nftnl_expr *e, json_t *root,
176 struct nftnl_parse_err *err)
183 if (nftnl_jansson_parse_reg(root,
"dreg", NFTNL_TYPE_U32, ®, err) == 0)
184 nftnl_expr_set_u32(e, NFTNL_EXPR_IMM_DREG, reg);
186 datareg_type = nftnl_jansson_data_reg_parse(root,
"data",
188 if (datareg_type >= 0) {
189 switch (datareg_type) {
191 e->flags |= (1 << NFTNL_EXPR_IMM_DATA);
194 e->flags |= (1 << NFTNL_EXPR_IMM_VERDICT);
197 e->flags |= (1 << NFTNL_EXPR_IMM_CHAIN);
211 nftnl_expr_immediate_xml_parse(
struct nftnl_expr *e, mxml_node_t *tree,
212 struct nftnl_parse_err *err)
219 if (nftnl_mxml_reg_parse(tree,
"dreg", ®, MXML_DESCEND_FIRST,
220 NFTNL_XML_MAND, err) == 0)
221 nftnl_expr_set_u32(e, NFTNL_EXPR_IMM_DREG, reg);
223 datareg_type = nftnl_mxml_data_reg_parse(tree,
"data",
224 &imm->data, NFTNL_XML_MAND, err);
225 if (datareg_type >= 0) {
226 switch (datareg_type) {
228 e->flags |= (1 << NFTNL_EXPR_IMM_DATA);
231 e->flags |= (1 << NFTNL_EXPR_IMM_VERDICT);
234 e->flags |= (1 << NFTNL_EXPR_IMM_CHAIN);
249 nftnl_expr_immediate_export(
char *buf,
size_t size,
struct nftnl_expr *e,
253 NFTNL_BUF_INIT(b, buf, size);
255 if (e->flags & (1 << NFTNL_EXPR_IMM_DREG))
256 nftnl_buf_u32(&b, type, imm->dreg, DREG);
257 if (e->flags & (1 << NFTNL_EXPR_IMM_DATA))
258 nftnl_buf_reg(&b, type, &imm->data, DATA_VALUE, DATA);
259 if (e->flags & (1 << NFTNL_EXPR_IMM_VERDICT))
260 nftnl_buf_reg(&b, type, &imm->data, DATA_VERDICT, DATA);
261 if (e->flags & (1 << NFTNL_EXPR_IMM_CHAIN))
262 nftnl_buf_reg(&b, type, &imm->data, DATA_CHAIN, DATA);
264 return nftnl_buf_done(&b);
268 nftnl_expr_immediate_snprintf_default(
char *buf,
size_t len,
269 struct nftnl_expr *e, uint32_t flags)
271 int size = len, offset = 0, ret;
274 ret = snprintf(buf, len,
"reg %u ", imm->dreg);
275 SNPRINTF_BUFFER_SIZE(ret, size, len, offset);
277 if (e->flags & (1 << NFTNL_EXPR_IMM_DATA)) {
278 ret = nftnl_data_reg_snprintf(buf+offset, len, &imm->data,
279 NFTNL_OUTPUT_DEFAULT, flags, DATA_VALUE);
280 SNPRINTF_BUFFER_SIZE(ret, size, len, offset);
282 }
else if (e->flags & (1 << NFTNL_EXPR_IMM_VERDICT)) {
283 ret = nftnl_data_reg_snprintf(buf+offset, len, &imm->data,
284 NFTNL_OUTPUT_DEFAULT, flags, DATA_VERDICT);
285 SNPRINTF_BUFFER_SIZE(ret, size, len, offset);
287 }
else if (e->flags & (1 << NFTNL_EXPR_IMM_CHAIN)) {
288 ret = nftnl_data_reg_snprintf(buf+offset, len, &imm->data,
289 NFTNL_OUTPUT_DEFAULT, flags, DATA_CHAIN);
290 SNPRINTF_BUFFER_SIZE(ret, size, len, offset);
297 nftnl_expr_immediate_snprintf(
char *buf,
size_t len, uint32_t type,
298 uint32_t flags,
struct nftnl_expr *e)
301 case NFTNL_OUTPUT_DEFAULT:
302 return nftnl_expr_immediate_snprintf_default(buf, len, e, flags);
303 case NFTNL_OUTPUT_XML:
304 case NFTNL_OUTPUT_JSON:
305 return nftnl_expr_immediate_export(buf, len, e, type);
312 static void nftnl_expr_immediate_free(
struct nftnl_expr *e)
316 if (e->flags & (1 << NFTNL_EXPR_IMM_VERDICT))
317 nftnl_free_verdict(&imm->data);
320 struct expr_ops expr_ops_immediate = {
323 .max_attr = NFTA_IMMEDIATE_MAX,
324 .free = nftnl_expr_immediate_free,
325 .set = nftnl_expr_immediate_set,
326 .get = nftnl_expr_immediate_get,
327 .parse = nftnl_expr_immediate_parse,
328 .build = nftnl_expr_immediate_build,
329 .snprintf = nftnl_expr_immediate_snprintf,
330 .xml_parse = nftnl_expr_immediate_xml_parse,
331 .json_parse = nftnl_expr_immediate_json_parse,