17 #include <arpa/inet.h>
19 #include <libmnl/libmnl.h>
20 #include <linux/netfilter/nf_tables.h>
21 #include <libnftnl/expr.h>
22 #include <libnftnl/rule.h>
25 enum nft_registers sreg;
26 enum nft_registers dreg;
28 union nftnl_data_reg mask;
29 union nftnl_data_reg xor;
33 nftnl_expr_bitwise_set(
struct nftnl_expr *e, uint16_t type,
34 const void *data, uint32_t data_len)
39 case NFTNL_EXPR_BITWISE_SREG:
40 memcpy(&bitwise->sreg, data,
sizeof(bitwise->sreg));
42 case NFTNL_EXPR_BITWISE_DREG:
43 memcpy(&bitwise->dreg, data,
sizeof(bitwise->dreg));
45 case NFTNL_EXPR_BITWISE_LEN:
46 memcpy(&bitwise->len, data,
sizeof(bitwise->len));
48 case NFTNL_EXPR_BITWISE_MASK:
49 memcpy(&bitwise->mask.val, data, data_len);
50 bitwise->mask.len = data_len;
52 case NFTNL_EXPR_BITWISE_XOR:
53 memcpy(&bitwise->xor.val, data, data_len);
54 bitwise->xor.len = data_len;
63 nftnl_expr_bitwise_get(
const struct nftnl_expr *e, uint16_t type,
69 case NFTNL_EXPR_BITWISE_SREG:
70 *data_len =
sizeof(bitwise->sreg);
71 return &bitwise->sreg;
72 case NFTNL_EXPR_BITWISE_DREG:
73 *data_len =
sizeof(bitwise->dreg);
74 return &bitwise->dreg;
75 case NFTNL_EXPR_BITWISE_LEN:
76 *data_len =
sizeof(bitwise->len);
78 case NFTNL_EXPR_BITWISE_MASK:
79 *data_len = bitwise->mask.len;
80 return &bitwise->mask.val;
81 case NFTNL_EXPR_BITWISE_XOR:
82 *data_len = bitwise->xor.len;
83 return &bitwise->xor.val;
88 static int nftnl_expr_bitwise_cb(
const struct nlattr *attr,
void *data)
90 const struct nlattr **tb = data;
91 int type = mnl_attr_get_type(attr);
93 if (mnl_attr_type_valid(attr, NFTA_BITWISE_MAX) < 0)
97 case NFTA_BITWISE_SREG:
98 case NFTA_BITWISE_DREG:
99 case NFTA_BITWISE_LEN:
100 if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
103 case NFTA_BITWISE_MASK:
104 case NFTA_BITWISE_XOR:
105 if (mnl_attr_validate(attr, MNL_TYPE_BINARY) < 0)
115 nftnl_expr_bitwise_build(
struct nlmsghdr *nlh,
const struct nftnl_expr *e)
119 if (e->flags & (1 << NFTNL_EXPR_BITWISE_SREG))
120 mnl_attr_put_u32(nlh, NFTA_BITWISE_SREG, htonl(bitwise->sreg));
121 if (e->flags & (1 << NFTNL_EXPR_BITWISE_DREG))
122 mnl_attr_put_u32(nlh, NFTA_BITWISE_DREG, htonl(bitwise->dreg));
123 if (e->flags & (1 << NFTNL_EXPR_BITWISE_LEN))
124 mnl_attr_put_u32(nlh, NFTA_BITWISE_LEN, htonl(bitwise->len));
125 if (e->flags & (1 << NFTNL_EXPR_BITWISE_MASK)) {
128 nest = mnl_attr_nest_start(nlh, NFTA_BITWISE_MASK);
129 mnl_attr_put(nlh, NFTA_DATA_VALUE, bitwise->mask.len,
131 mnl_attr_nest_end(nlh, nest);
133 if (e->flags & (1 << NFTNL_EXPR_BITWISE_XOR)) {
136 nest = mnl_attr_nest_start(nlh, NFTA_BITWISE_XOR);
137 mnl_attr_put(nlh, NFTA_DATA_VALUE, bitwise->xor.len,
139 mnl_attr_nest_end(nlh, nest);
144 nftnl_expr_bitwise_parse(
struct nftnl_expr *e,
struct nlattr *attr)
147 struct nlattr *tb[NFTA_BITWISE_MAX+1] = {};
150 if (mnl_attr_parse_nested(attr, nftnl_expr_bitwise_cb, tb) < 0)
153 if (tb[NFTA_BITWISE_SREG]) {
154 bitwise->sreg = ntohl(mnl_attr_get_u32(tb[NFTA_BITWISE_SREG]));
155 e->flags |= (1 << NFTNL_EXPR_BITWISE_SREG);
157 if (tb[NFTA_BITWISE_DREG]) {
158 bitwise->dreg = ntohl(mnl_attr_get_u32(tb[NFTA_BITWISE_DREG]));
159 e->flags |= (1 << NFTNL_EXPR_BITWISE_DREG);
161 if (tb[NFTA_BITWISE_LEN]) {
162 bitwise->len = ntohl(mnl_attr_get_u32(tb[NFTA_BITWISE_LEN]));
163 e->flags |= (1 << NFTNL_EXPR_BITWISE_LEN);
165 if (tb[NFTA_BITWISE_MASK]) {
166 ret = nftnl_parse_data(&bitwise->mask, tb[NFTA_BITWISE_MASK], NULL);
167 e->flags |= (1 << NFTA_BITWISE_MASK);
169 if (tb[NFTA_BITWISE_XOR]) {
170 ret = nftnl_parse_data(&bitwise->xor, tb[NFTA_BITWISE_XOR], NULL);
171 e->flags |= (1 << NFTA_BITWISE_XOR);
177 static int nftnl_expr_bitwise_snprintf_default(
char *buf,
size_t size,
178 const struct nftnl_expr *e)
181 int remain = size, offset = 0, ret;
183 ret = snprintf(buf, remain,
"reg %u = (reg=%u & ",
184 bitwise->dreg, bitwise->sreg);
185 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
187 ret = nftnl_data_reg_snprintf(buf + offset, remain, &bitwise->mask,
188 NFTNL_OUTPUT_DEFAULT, 0, DATA_VALUE);
189 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
191 ret = snprintf(buf + offset, remain,
") ^ ");
192 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
194 ret = nftnl_data_reg_snprintf(buf + offset, remain, &bitwise->xor,
195 NFTNL_OUTPUT_DEFAULT, 0, DATA_VALUE);
196 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
202 nftnl_expr_bitwise_snprintf(
char *buf,
size_t size, uint32_t type,
203 uint32_t flags,
const struct nftnl_expr *e)
206 case NFTNL_OUTPUT_DEFAULT:
207 return nftnl_expr_bitwise_snprintf_default(buf, size, e);
214 struct expr_ops expr_ops_bitwise = {
217 .max_attr = NFTA_BITWISE_MAX,
218 .set = nftnl_expr_bitwise_set,
219 .get = nftnl_expr_bitwise_get,
220 .parse = nftnl_expr_bitwise_parse,
221 .build = nftnl_expr_bitwise_build,
222 .snprintf = nftnl_expr_bitwise_snprintf,