13 #include <arpa/inet.h>
16 #include <libmnl/libmnl.h>
17 #include <linux/netfilter/nf_tables.h>
18 #include <libnftnl/expr.h>
19 #include <libnftnl/rule.h>
22 union nftnl_data_reg data;
23 enum nft_registers sreg;
28 nftnl_expr_cmp_set(
struct nftnl_expr *e, uint16_t type,
29 const void *data, uint32_t data_len)
34 case NFTNL_EXPR_CMP_SREG:
35 memcpy(&cmp->sreg, data, data_len);
37 case NFTNL_EXPR_CMP_OP:
38 memcpy(&cmp->op, data, data_len);
40 case NFTNL_EXPR_CMP_DATA:
41 return nftnl_data_cpy(&cmp->data, data, data_len);
47 nftnl_expr_cmp_get(
const struct nftnl_expr *e, uint16_t type,
53 case NFTNL_EXPR_CMP_SREG:
54 *data_len =
sizeof(cmp->sreg);
56 case NFTNL_EXPR_CMP_OP:
57 *data_len =
sizeof(cmp->op);
59 case NFTNL_EXPR_CMP_DATA:
60 *data_len = cmp->data.len;
61 return &cmp->data.val;
66 static int nftnl_expr_cmp_cb(
const struct nlattr *attr,
void *data)
68 const struct nlattr **tb = data;
69 int type = mnl_attr_get_type(attr);
71 if (mnl_attr_type_valid(attr, NFTA_CMP_MAX) < 0)
77 if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
81 if (mnl_attr_validate(attr, MNL_TYPE_BINARY) < 0)
91 nftnl_expr_cmp_build(
struct nlmsghdr *nlh,
const struct nftnl_expr *e)
95 if (e->flags & (1 << NFTNL_EXPR_CMP_SREG))
96 mnl_attr_put_u32(nlh, NFTA_CMP_SREG, htonl(cmp->sreg));
97 if (e->flags & (1 << NFTNL_EXPR_CMP_OP))
98 mnl_attr_put_u32(nlh, NFTA_CMP_OP, htonl(cmp->op));
99 if (e->flags & (1 << NFTNL_EXPR_CMP_DATA)) {
102 nest = mnl_attr_nest_start(nlh, NFTA_CMP_DATA);
103 mnl_attr_put(nlh, NFTA_DATA_VALUE, cmp->data.len, cmp->data.val);
104 mnl_attr_nest_end(nlh, nest);
109 nftnl_expr_cmp_parse(
struct nftnl_expr *e,
struct nlattr *attr)
112 struct nlattr *tb[NFTA_CMP_MAX+1] = {};
115 if (mnl_attr_parse_nested(attr, nftnl_expr_cmp_cb, tb) < 0)
118 if (tb[NFTA_CMP_SREG]) {
119 cmp->sreg = ntohl(mnl_attr_get_u32(tb[NFTA_CMP_SREG]));
120 e->flags |= (1 << NFTA_CMP_SREG);
122 if (tb[NFTA_CMP_OP]) {
123 cmp->op = ntohl(mnl_attr_get_u32(tb[NFTA_CMP_OP]));
124 e->flags |= (1 << NFTA_CMP_OP);
126 if (tb[NFTA_CMP_DATA]) {
127 ret = nftnl_parse_data(&cmp->data, tb[NFTA_CMP_DATA], NULL);
128 e->flags |= (1 << NFTA_CMP_DATA);
134 static const char *expr_cmp_str[] = {
136 [NFT_CMP_NEQ] =
"neq",
138 [NFT_CMP_LTE] =
"lte",
140 [NFT_CMP_GTE] =
"gte",
143 static const char *cmp2str(uint32_t op)
145 if (op > NFT_CMP_GTE)
148 return expr_cmp_str[op];
152 nftnl_expr_cmp_snprintf(
char *buf,
size_t remain,
153 uint32_t flags,
const struct nftnl_expr *e)
158 ret = snprintf(buf, remain,
"%s reg %u ",
159 cmp2str(cmp->op), cmp->sreg);
160 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
162 ret = nftnl_data_reg_snprintf(buf + offset, remain, &cmp->data,
164 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
169 static struct attr_policy cmp_attr_policy[__NFTNL_EXPR_CMP_MAX] = {
170 [NFTNL_EXPR_CMP_SREG] = { .maxlen =
sizeof(uint32_t) },
171 [NFTNL_EXPR_CMP_OP] = { .maxlen =
sizeof(uint32_t) },
172 [NFTNL_EXPR_CMP_DATA] = { .maxlen = NFT_DATA_VALUE_MAXLEN }
175 struct expr_ops expr_ops_cmp = {
178 .nftnl_max_attr = __NFTNL_EXPR_CMP_MAX - 1,
179 .attr_policy = cmp_attr_policy,
180 .set = nftnl_expr_cmp_set,
181 .get = nftnl_expr_cmp_get,
182 .parse = nftnl_expr_cmp_parse,
183 .build = nftnl_expr_cmp_build,
184 .output = nftnl_expr_cmp_snprintf,