11 #include <arpa/inet.h>
14 #include <libmnl/libmnl.h>
15 #include <linux/netfilter/nf_tables.h>
16 #include <libnftnl/expr.h>
17 #include <libnftnl/rule.h>
20 union nftnl_data_reg data;
21 enum nft_registers dreg;
25 nftnl_expr_immediate_set(
struct nftnl_expr *e, uint16_t type,
26 const void *data, uint32_t data_len)
31 case NFTNL_EXPR_IMM_DREG:
32 memcpy(&imm->dreg, data, data_len);
34 case NFTNL_EXPR_IMM_DATA:
35 return nftnl_data_cpy(&imm->data, data, data_len);
36 case NFTNL_EXPR_IMM_VERDICT:
37 memcpy(&imm->data.verdict, data, data_len);
39 case NFTNL_EXPR_IMM_CHAIN:
40 if (e->flags & (1 << NFTNL_EXPR_IMM_CHAIN))
41 xfree(imm->data.chain);
43 imm->data.chain = strdup(data);
47 case NFTNL_EXPR_IMM_CHAIN_ID:
48 memcpy(&imm->data.chain_id, data, data_len);
55 nftnl_expr_immediate_get(
const struct nftnl_expr *e, uint16_t type,
61 case NFTNL_EXPR_IMM_DREG:
62 *data_len =
sizeof(imm->dreg);
64 case NFTNL_EXPR_IMM_DATA:
65 *data_len = imm->data.len;
66 return &imm->data.val;
67 case NFTNL_EXPR_IMM_VERDICT:
68 *data_len =
sizeof(imm->data.verdict);
69 return &imm->data.verdict;
70 case NFTNL_EXPR_IMM_CHAIN:
71 *data_len = strlen(imm->data.chain)+1;
72 return imm->data.chain;
73 case NFTNL_EXPR_IMM_CHAIN_ID:
74 *data_len =
sizeof(imm->data.chain_id);
75 return &imm->data.chain_id;
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,
const 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);
127 if (e->flags & (1 << NFTNL_EXPR_IMM_CHAIN_ID)) {
128 mnl_attr_put_u32(nlh, NFTA_VERDICT_CHAIN_ID,
129 htonl(imm->data.chain_id));
132 mnl_attr_nest_end(nlh, nest1);
133 mnl_attr_nest_end(nlh, nest2);
138 nftnl_expr_immediate_parse(
struct nftnl_expr *e,
struct nlattr *attr)
141 struct nlattr *tb[NFTA_IMMEDIATE_MAX+1] = {};
144 if (mnl_attr_parse_nested(attr, nftnl_expr_immediate_cb, tb) < 0)
147 if (tb[NFTA_IMMEDIATE_DREG]) {
148 imm->dreg = ntohl(mnl_attr_get_u32(tb[NFTA_IMMEDIATE_DREG]));
149 e->flags |= (1 << NFTNL_EXPR_IMM_DREG);
151 if (tb[NFTA_IMMEDIATE_DATA]) {
154 ret = nftnl_parse_data(&imm->data, tb[NFTA_IMMEDIATE_DATA], &type);
161 e->flags |= (1 << NFTNL_EXPR_IMM_DATA);
165 e->flags |= (1 << NFTNL_EXPR_IMM_VERDICT);
169 e->flags |= (1 << NFTNL_EXPR_IMM_VERDICT) |
170 (1 << NFTNL_EXPR_IMM_CHAIN);
179 nftnl_expr_immediate_snprintf(
char *buf,
size_t remain,
180 uint32_t flags,
const struct nftnl_expr *e)
185 ret = snprintf(buf, remain,
"reg %u ", imm->dreg);
186 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
188 if (e->flags & (1 << NFTNL_EXPR_IMM_DATA)) {
189 ret = nftnl_data_reg_snprintf(buf + offset, remain, &imm->data,
191 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
193 }
else if (e->flags & (1 << NFTNL_EXPR_IMM_VERDICT)) {
194 ret = nftnl_data_reg_snprintf(buf + offset, remain, &imm->data,
195 flags, DATA_VERDICT);
196 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
198 }
else if (e->flags & (1 << NFTNL_EXPR_IMM_CHAIN)) {
199 ret = nftnl_data_reg_snprintf(buf + offset, remain, &imm->data,
201 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
207 static void nftnl_expr_immediate_free(
const struct nftnl_expr *e)
211 if (e->flags & (1 << NFTNL_EXPR_IMM_CHAIN))
212 xfree(imm->data.chain);
215 static struct attr_policy immediate_attr_policy[__NFTNL_EXPR_IMM_MAX] = {
216 [NFTNL_EXPR_IMM_DREG] = { .maxlen =
sizeof(uint32_t) },
217 [NFTNL_EXPR_IMM_DATA] = { .maxlen = NFT_DATA_VALUE_MAXLEN },
218 [NFTNL_EXPR_IMM_VERDICT] = { .maxlen =
sizeof(uint32_t) },
219 [NFTNL_EXPR_IMM_CHAIN] = { .maxlen = NFT_CHAIN_MAXNAMELEN },
220 [NFTNL_EXPR_IMM_CHAIN_ID] = { .maxlen =
sizeof(uint32_t) },
223 struct expr_ops expr_ops_immediate = {
226 .nftnl_max_attr = __NFTNL_EXPR_IMM_MAX - 1,
227 .attr_policy = immediate_attr_policy,
228 .free = nftnl_expr_immediate_free,
229 .set = nftnl_expr_immediate_set,
230 .get = nftnl_expr_immediate_get,
231 .parse = nftnl_expr_immediate_parse,
232 .build = nftnl_expr_immediate_build,
233 .output = nftnl_expr_immediate_snprintf,