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_from;
25 union nftnl_data_reg data_to;
26 enum nft_registers sreg;
27 enum nft_range_ops op;
30static int nftnl_expr_range_set(
struct nftnl_expr *e, uint16_t type,
31 const void *data, uint32_t data_len)
36 case NFTNL_EXPR_RANGE_SREG:
37 memcpy(&range->sreg, data, data_len);
39 case NFTNL_EXPR_RANGE_OP:
40 memcpy(&range->op, data, data_len);
42 case NFTNL_EXPR_RANGE_FROM_DATA:
43 return nftnl_data_cpy(&range->data_from, data, data_len);
44 case NFTNL_EXPR_RANGE_TO_DATA:
45 return nftnl_data_cpy(&range->data_to, data, data_len);
50static const void *nftnl_expr_range_get(
const struct nftnl_expr *e,
51 uint16_t type, uint32_t *data_len)
56 case NFTNL_EXPR_RANGE_SREG:
57 *data_len =
sizeof(range->sreg);
59 case NFTNL_EXPR_RANGE_OP:
60 *data_len =
sizeof(range->op);
62 case NFTNL_EXPR_RANGE_FROM_DATA:
63 *data_len = range->data_from.len;
64 return &range->data_from.val;
65 case NFTNL_EXPR_RANGE_TO_DATA:
66 *data_len = range->data_to.len;
67 return &range->data_to.val;
72static int nftnl_expr_range_cb(
const struct nlattr *attr,
void *data)
74 const struct nlattr **tb = data;
75 int type = mnl_attr_get_type(attr);
77 if (mnl_attr_type_valid(attr, NFTA_RANGE_MAX) < 0)
83 if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
86 case NFTA_RANGE_FROM_DATA:
87 case NFTA_RANGE_TO_DATA:
88 if (mnl_attr_validate(attr, MNL_TYPE_BINARY) < 0)
98nftnl_expr_range_build(
struct nlmsghdr *nlh,
const struct nftnl_expr *e)
102 if (e->flags & (1 << NFTNL_EXPR_RANGE_SREG))
103 mnl_attr_put_u32(nlh, NFTA_RANGE_SREG, htonl(range->sreg));
104 if (e->flags & (1 << NFTNL_EXPR_RANGE_OP))
105 mnl_attr_put_u32(nlh, NFTA_RANGE_OP, htonl(range->op));
106 if (e->flags & (1 << NFTNL_EXPR_RANGE_FROM_DATA)) {
109 nest = mnl_attr_nest_start(nlh, NFTA_RANGE_FROM_DATA);
110 mnl_attr_put(nlh, NFTA_DATA_VALUE, range->data_from.len,
111 range->data_from.val);
112 mnl_attr_nest_end(nlh, nest);
114 if (e->flags & (1 << NFTNL_EXPR_RANGE_TO_DATA)) {
117 nest = mnl_attr_nest_start(nlh, NFTA_RANGE_TO_DATA);
118 mnl_attr_put(nlh, NFTA_DATA_VALUE, range->data_to.len,
120 mnl_attr_nest_end(nlh, nest);
125nftnl_expr_range_parse(
struct nftnl_expr *e,
struct nlattr *attr)
128 struct nlattr *tb[NFTA_RANGE_MAX+1] = {};
131 if (mnl_attr_parse_nested(attr, nftnl_expr_range_cb, tb) < 0)
134 if (tb[NFTA_RANGE_SREG]) {
135 range->sreg = ntohl(mnl_attr_get_u32(tb[NFTA_RANGE_SREG]));
136 e->flags |= (1 << NFTA_RANGE_SREG);
138 if (tb[NFTA_RANGE_OP]) {
139 range->op = ntohl(mnl_attr_get_u32(tb[NFTA_RANGE_OP]));
140 e->flags |= (1 << NFTA_RANGE_OP);
142 if (tb[NFTA_RANGE_FROM_DATA]) {
143 ret = nftnl_parse_data(&range->data_from,
144 tb[NFTA_RANGE_FROM_DATA], NULL);
145 e->flags |= (1 << NFTA_RANGE_FROM_DATA);
147 if (tb[NFTA_RANGE_TO_DATA]) {
148 ret = nftnl_parse_data(&range->data_to,
149 tb[NFTA_RANGE_TO_DATA], NULL);
150 e->flags |= (1 << NFTA_RANGE_TO_DATA);
156static const char *expr_range_str[] = {
157 [NFT_RANGE_EQ] =
"eq",
158 [NFT_RANGE_NEQ] =
"neq",
161static const char *range2str(uint32_t op)
163 if (op > NFT_RANGE_NEQ)
166 return expr_range_str[op];
169static inline int nftnl_str2range(
const char *op)
171 if (strcmp(op,
"eq") == 0)
173 else if (strcmp(op,
"neq") == 0)
174 return NFT_RANGE_NEQ;
181static int nftnl_expr_range_snprintf(
char *buf,
size_t remain,
182 uint32_t flags,
const struct nftnl_expr *e)
187 ret = snprintf(buf, remain,
"%s reg %u ",
188 range2str(range->op), range->sreg);
189 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
191 ret = nftnl_data_reg_snprintf(buf + offset, remain, &range->data_from,
193 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
195 ret = nftnl_data_reg_snprintf(buf + offset, remain, &range->data_to,
197 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
202static struct attr_policy range_attr_policy[__NFTNL_EXPR_RANGE_MAX] = {
203 [NFTNL_EXPR_RANGE_SREG] = { .maxlen =
sizeof(uint32_t) },
204 [NFTNL_EXPR_RANGE_OP] = { .maxlen =
sizeof(uint32_t) },
205 [NFTNL_EXPR_RANGE_FROM_DATA] = { .maxlen = NFT_DATA_VALUE_MAXLEN },
206 [NFTNL_EXPR_RANGE_TO_DATA] = { .maxlen = NFT_DATA_VALUE_MAXLEN },
209struct expr_ops expr_ops_range = {
212 .nftnl_max_attr = __NFTNL_EXPR_RANGE_MAX - 1,
213 .attr_policy = range_attr_policy,
214 .set = nftnl_expr_range_set,
215 .get = nftnl_expr_range_get,
216 .parse = nftnl_expr_range_parse,
217 .build = nftnl_expr_range_build,
218 .output = nftnl_expr_range_snprintf,