20#include <libmnl/libmnl.h>
21#include <linux/netfilter/nf_tables.h>
22#include <libnftnl/expr.h>
23#include <libnftnl/rule.h>
26 union nftnl_data_reg data;
27 enum nft_registers sreg;
32nftnl_expr_cmp_set(
struct nftnl_expr *e, uint16_t type,
33 const void *data, uint32_t data_len)
38 case NFTNL_EXPR_CMP_SREG:
39 memcpy(&cmp->sreg, data,
sizeof(cmp->sreg));
41 case NFTNL_EXPR_CMP_OP:
42 memcpy(&cmp->op, data,
sizeof(cmp->op));
44 case NFTNL_EXPR_CMP_DATA:
45 memcpy(&cmp->data.val, data, data_len);
46 cmp->data.len = data_len;
55nftnl_expr_cmp_get(
const struct nftnl_expr *e, uint16_t type,
61 case NFTNL_EXPR_CMP_SREG:
62 *data_len =
sizeof(cmp->sreg);
64 case NFTNL_EXPR_CMP_OP:
65 *data_len =
sizeof(cmp->op);
67 case NFTNL_EXPR_CMP_DATA:
68 *data_len = cmp->data.len;
69 return &cmp->data.val;
74static int nftnl_expr_cmp_cb(
const struct nlattr *attr,
void *data)
76 const struct nlattr **tb = data;
77 int type = mnl_attr_get_type(attr);
79 if (mnl_attr_type_valid(attr, NFTA_CMP_MAX) < 0)
85 if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
89 if (mnl_attr_validate(attr, MNL_TYPE_BINARY) < 0)
99nftnl_expr_cmp_build(
struct nlmsghdr *nlh,
const struct nftnl_expr *e)
103 if (e->flags & (1 << NFTNL_EXPR_CMP_SREG))
104 mnl_attr_put_u32(nlh, NFTA_CMP_SREG, htonl(cmp->sreg));
105 if (e->flags & (1 << NFTNL_EXPR_CMP_OP))
106 mnl_attr_put_u32(nlh, NFTA_CMP_OP, htonl(cmp->op));
107 if (e->flags & (1 << NFTNL_EXPR_CMP_DATA)) {
110 nest = mnl_attr_nest_start(nlh, NFTA_CMP_DATA);
111 mnl_attr_put(nlh, NFTA_DATA_VALUE, cmp->data.len, cmp->data.val);
112 mnl_attr_nest_end(nlh, nest);
117nftnl_expr_cmp_parse(
struct nftnl_expr *e,
struct nlattr *attr)
120 struct nlattr *tb[NFTA_CMP_MAX+1] = {};
123 if (mnl_attr_parse_nested(attr, nftnl_expr_cmp_cb, tb) < 0)
126 if (tb[NFTA_CMP_SREG]) {
127 cmp->sreg = ntohl(mnl_attr_get_u32(tb[NFTA_CMP_SREG]));
128 e->flags |= (1 << NFTA_CMP_SREG);
130 if (tb[NFTA_CMP_OP]) {
131 cmp->op = ntohl(mnl_attr_get_u32(tb[NFTA_CMP_OP]));
132 e->flags |= (1 << NFTA_CMP_OP);
134 if (tb[NFTA_CMP_DATA]) {
135 ret = nftnl_parse_data(&cmp->data, tb[NFTA_CMP_DATA], NULL);
136 e->flags |= (1 << NFTA_CMP_DATA);
142static const char *expr_cmp_str[] = {
144 [NFT_CMP_NEQ] =
"neq",
146 [NFT_CMP_LTE] =
"lte",
148 [NFT_CMP_GTE] =
"gte",
151static const char *cmp2str(uint32_t op)
153 if (op > NFT_CMP_GTE)
156 return expr_cmp_str[op];
159static inline int nftnl_str2cmp(
const char *op)
161 if (strcmp(op,
"eq") == 0)
163 else if (strcmp(op,
"neq") == 0)
165 else if (strcmp(op,
"lt") == 0)
167 else if (strcmp(op,
"lte") == 0)
169 else if (strcmp(op,
"gt") == 0)
171 else if (strcmp(op,
"gte") == 0)
180nftnl_expr_cmp_snprintf(
char *buf,
size_t remain,
181 uint32_t flags,
const struct nftnl_expr *e)
186 ret = snprintf(buf, remain,
"%s reg %u ",
187 cmp2str(cmp->op), cmp->sreg);
188 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
190 ret = nftnl_data_reg_snprintf(buf + offset, remain, &cmp->data,
192 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
197struct expr_ops expr_ops_cmp = {
200 .max_attr = NFTA_CMP_MAX,
201 .set = nftnl_expr_cmp_set,
202 .get = nftnl_expr_cmp_get,
203 .parse = nftnl_expr_cmp_parse,
204 .build = nftnl_expr_cmp_build,
205 .output = nftnl_expr_cmp_snprintf,