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 memcpy(&imm->dreg, data,
sizeof(imm->dreg));
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 memcpy(&imm->data.verdict, data,
sizeof(imm->data.verdict));
45 case NFTNL_EXPR_IMM_CHAIN:
46 if (e->flags & (1 << NFTNL_EXPR_IMM_CHAIN))
47 xfree(imm->data.chain);
49 imm->data.chain = strdup(data);
60 nftnl_expr_immediate_get(
const struct nftnl_expr *e, uint16_t type,
66 case NFTNL_EXPR_IMM_DREG:
67 *data_len =
sizeof(imm->dreg);
69 case NFTNL_EXPR_IMM_DATA:
70 *data_len = imm->data.len;
71 return &imm->data.val;
72 case NFTNL_EXPR_IMM_VERDICT:
73 *data_len =
sizeof(imm->data.verdict);
74 return &imm->data.verdict;
75 case NFTNL_EXPR_IMM_CHAIN:
76 *data_len = strlen(imm->data.chain)+1;
77 return imm->data.chain;
82 static int nftnl_expr_immediate_cb(
const struct nlattr *attr,
void *data)
84 const struct nlattr **tb = data;
85 int type = mnl_attr_get_type(attr);
87 if (mnl_attr_type_valid(attr, NFTA_IMMEDIATE_MAX) < 0)
91 case NFTA_IMMEDIATE_DREG:
92 if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
95 case NFTA_IMMEDIATE_DATA:
96 if (mnl_attr_validate(attr, MNL_TYPE_BINARY) < 0)
106 nftnl_expr_immediate_build(
struct nlmsghdr *nlh,
const struct nftnl_expr *e)
110 if (e->flags & (1 << NFTNL_EXPR_IMM_DREG))
111 mnl_attr_put_u32(nlh, NFTA_IMMEDIATE_DREG, htonl(imm->dreg));
114 if (e->flags & (1 << NFTNL_EXPR_IMM_DATA)) {
117 nest = mnl_attr_nest_start(nlh, NFTA_IMMEDIATE_DATA);
118 mnl_attr_put(nlh, NFTA_DATA_VALUE, imm->data.len, imm->data.val);
119 mnl_attr_nest_end(nlh, nest);
121 }
else if (e->flags & (1 << NFTNL_EXPR_IMM_VERDICT)) {
122 struct nlattr *nest1, *nest2;
124 nest1 = mnl_attr_nest_start(nlh, NFTA_IMMEDIATE_DATA);
125 nest2 = mnl_attr_nest_start(nlh, NFTA_DATA_VERDICT);
126 mnl_attr_put_u32(nlh, NFTA_VERDICT_CODE, htonl(imm->data.verdict));
127 if (e->flags & (1 << NFTNL_EXPR_IMM_CHAIN))
128 mnl_attr_put_strz(nlh, NFTA_VERDICT_CHAIN, imm->data.chain);
130 mnl_attr_nest_end(nlh, nest1);
131 mnl_attr_nest_end(nlh, nest2);
136 nftnl_expr_immediate_parse(
struct nftnl_expr *e,
struct nlattr *attr)
139 struct nlattr *tb[NFTA_IMMEDIATE_MAX+1] = {};
142 if (mnl_attr_parse_nested(attr, nftnl_expr_immediate_cb, tb) < 0)
145 if (tb[NFTA_IMMEDIATE_DREG]) {
146 imm->dreg = ntohl(mnl_attr_get_u32(tb[NFTA_IMMEDIATE_DREG]));
147 e->flags |= (1 << NFTNL_EXPR_IMM_DREG);
149 if (tb[NFTA_IMMEDIATE_DATA]) {
152 ret = nftnl_parse_data(&imm->data, tb[NFTA_IMMEDIATE_DATA], &type);
159 e->flags |= (1 << NFTNL_EXPR_IMM_DATA);
163 e->flags |= (1 << NFTNL_EXPR_IMM_VERDICT);
167 e->flags |= (1 << NFTNL_EXPR_IMM_VERDICT) |
168 (1 << NFTNL_EXPR_IMM_CHAIN);
177 nftnl_expr_immediate_snprintf_default(
char *buf,
size_t len,
178 const struct nftnl_expr *e,
181 int remain = len, offset = 0, ret;
184 ret = snprintf(buf, remain,
"reg %u ", imm->dreg);
185 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
187 if (e->flags & (1 << NFTNL_EXPR_IMM_DATA)) {
188 ret = nftnl_data_reg_snprintf(buf + offset, remain, &imm->data,
189 NFTNL_OUTPUT_DEFAULT, flags, DATA_VALUE);
190 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
192 }
else if (e->flags & (1 << NFTNL_EXPR_IMM_VERDICT)) {
193 ret = nftnl_data_reg_snprintf(buf + offset, remain, &imm->data,
194 NFTNL_OUTPUT_DEFAULT, flags, DATA_VERDICT);
195 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
197 }
else if (e->flags & (1 << NFTNL_EXPR_IMM_CHAIN)) {
198 ret = nftnl_data_reg_snprintf(buf + offset, remain, &imm->data,
199 NFTNL_OUTPUT_DEFAULT, flags, DATA_CHAIN);
200 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
207 nftnl_expr_immediate_snprintf(
char *buf,
size_t len, uint32_t type,
208 uint32_t flags,
const struct nftnl_expr *e)
211 case NFTNL_OUTPUT_DEFAULT:
212 return nftnl_expr_immediate_snprintf_default(buf, len, e, flags);
213 case NFTNL_OUTPUT_XML:
214 case NFTNL_OUTPUT_JSON:
221 static void nftnl_expr_immediate_free(
const struct nftnl_expr *e)
225 if (e->flags & (1 << NFTNL_EXPR_IMM_VERDICT))
226 nftnl_free_verdict(&imm->data);
229 struct expr_ops expr_ops_immediate = {
232 .max_attr = NFTA_IMMEDIATE_MAX,
233 .free = nftnl_expr_immediate_free,
234 .set = nftnl_expr_immediate_set,
235 .get = nftnl_expr_immediate_get,
236 .parse = nftnl_expr_immediate_parse,
237 .build = nftnl_expr_immediate_build,
238 .snprintf = nftnl_expr_immediate_snprintf,