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;
29nftnl_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, data_len);
38 case NFTNL_EXPR_IMM_DATA:
39 return nftnl_data_cpy(&imm->data, data, data_len);
40 case NFTNL_EXPR_IMM_VERDICT:
41 memcpy(&imm->data.verdict, data, data_len);
43 case NFTNL_EXPR_IMM_CHAIN:
44 if (e->flags & (1 << NFTNL_EXPR_IMM_CHAIN))
45 xfree(imm->data.chain);
47 imm->data.chain = strdup(data);
51 case NFTNL_EXPR_IMM_CHAIN_ID:
52 memcpy(&imm->data.chain_id, data, data_len);
59nftnl_expr_immediate_get(
const struct nftnl_expr *e, uint16_t type,
65 case NFTNL_EXPR_IMM_DREG:
66 *data_len =
sizeof(imm->dreg);
68 case NFTNL_EXPR_IMM_DATA:
69 *data_len = imm->data.len;
70 return &imm->data.val;
71 case NFTNL_EXPR_IMM_VERDICT:
72 *data_len =
sizeof(imm->data.verdict);
73 return &imm->data.verdict;
74 case NFTNL_EXPR_IMM_CHAIN:
75 *data_len = strlen(imm->data.chain)+1;
76 return imm->data.chain;
77 case NFTNL_EXPR_IMM_CHAIN_ID:
78 *data_len =
sizeof(imm->data.chain_id);
79 return &imm->data.chain_id;
84static int nftnl_expr_immediate_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_IMMEDIATE_MAX) < 0)
93 case NFTA_IMMEDIATE_DREG:
94 if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
97 case NFTA_IMMEDIATE_DATA:
98 if (mnl_attr_validate(attr, MNL_TYPE_BINARY) < 0)
108nftnl_expr_immediate_build(
struct nlmsghdr *nlh,
const struct nftnl_expr *e)
112 if (e->flags & (1 << NFTNL_EXPR_IMM_DREG))
113 mnl_attr_put_u32(nlh, NFTA_IMMEDIATE_DREG, htonl(imm->dreg));
116 if (e->flags & (1 << NFTNL_EXPR_IMM_DATA)) {
119 nest = mnl_attr_nest_start(nlh, NFTA_IMMEDIATE_DATA);
120 mnl_attr_put(nlh, NFTA_DATA_VALUE, imm->data.len, imm->data.val);
121 mnl_attr_nest_end(nlh, nest);
123 }
else if (e->flags & (1 << NFTNL_EXPR_IMM_VERDICT)) {
124 struct nlattr *nest1, *nest2;
126 nest1 = mnl_attr_nest_start(nlh, NFTA_IMMEDIATE_DATA);
127 nest2 = mnl_attr_nest_start(nlh, NFTA_DATA_VERDICT);
128 mnl_attr_put_u32(nlh, NFTA_VERDICT_CODE, htonl(imm->data.verdict));
129 if (e->flags & (1 << NFTNL_EXPR_IMM_CHAIN))
130 mnl_attr_put_strz(nlh, NFTA_VERDICT_CHAIN, imm->data.chain);
131 if (e->flags & (1 << NFTNL_EXPR_IMM_CHAIN_ID)) {
132 mnl_attr_put_u32(nlh, NFTA_VERDICT_CHAIN_ID,
133 htonl(imm->data.chain_id));
136 mnl_attr_nest_end(nlh, nest1);
137 mnl_attr_nest_end(nlh, nest2);
142nftnl_expr_immediate_parse(
struct nftnl_expr *e,
struct nlattr *attr)
145 struct nlattr *tb[NFTA_IMMEDIATE_MAX+1] = {};
148 if (mnl_attr_parse_nested(attr, nftnl_expr_immediate_cb, tb) < 0)
151 if (tb[NFTA_IMMEDIATE_DREG]) {
152 imm->dreg = ntohl(mnl_attr_get_u32(tb[NFTA_IMMEDIATE_DREG]));
153 e->flags |= (1 << NFTNL_EXPR_IMM_DREG);
155 if (tb[NFTA_IMMEDIATE_DATA]) {
158 ret = nftnl_parse_data(&imm->data, tb[NFTA_IMMEDIATE_DATA], &type);
165 e->flags |= (1 << NFTNL_EXPR_IMM_DATA);
169 e->flags |= (1 << NFTNL_EXPR_IMM_VERDICT);
173 e->flags |= (1 << NFTNL_EXPR_IMM_VERDICT) |
174 (1 << NFTNL_EXPR_IMM_CHAIN);
183nftnl_expr_immediate_snprintf(
char *buf,
size_t remain,
184 uint32_t flags,
const struct nftnl_expr *e)
189 ret = snprintf(buf, remain,
"reg %u ", imm->dreg);
190 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
192 if (e->flags & (1 << NFTNL_EXPR_IMM_DATA)) {
193 ret = nftnl_data_reg_snprintf(buf + offset, remain, &imm->data,
195 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
197 }
else if (e->flags & (1 << NFTNL_EXPR_IMM_VERDICT)) {
198 ret = nftnl_data_reg_snprintf(buf + offset, remain, &imm->data,
199 flags, DATA_VERDICT);
200 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
202 }
else if (e->flags & (1 << NFTNL_EXPR_IMM_CHAIN)) {
203 ret = nftnl_data_reg_snprintf(buf + offset, remain, &imm->data,
205 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
211static void nftnl_expr_immediate_free(
const struct nftnl_expr *e)
215 if (e->flags & (1 << NFTNL_EXPR_IMM_CHAIN))
216 xfree(imm->data.chain);
219static struct attr_policy immediate_attr_policy[__NFTNL_EXPR_IMM_MAX] = {
220 [NFTNL_EXPR_IMM_DREG] = { .maxlen =
sizeof(uint32_t) },
221 [NFTNL_EXPR_IMM_DATA] = { .maxlen = NFT_DATA_VALUE_MAXLEN },
222 [NFTNL_EXPR_IMM_VERDICT] = { .maxlen =
sizeof(uint32_t) },
223 [NFTNL_EXPR_IMM_CHAIN] = { .maxlen = NFT_CHAIN_MAXNAMELEN },
224 [NFTNL_EXPR_IMM_CHAIN_ID] = { .maxlen =
sizeof(uint32_t) },
227struct expr_ops expr_ops_immediate = {
230 .nftnl_max_attr = __NFTNL_EXPR_IMM_MAX - 1,
231 .attr_policy = immediate_attr_policy,
232 .free = nftnl_expr_immediate_free,
233 .set = nftnl_expr_immediate_set,
234 .get = nftnl_expr_immediate_get,
235 .parse = nftnl_expr_immediate_parse,
236 .build = nftnl_expr_immediate_build,
237 .output = nftnl_expr_immediate_snprintf,