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 bitwise->sreg = *((uint32_t *)data);
42 case NFTNL_EXPR_BITWISE_DREG:
43 bitwise->dreg = *((uint32_t *)data);
45 case NFTNL_EXPR_BITWISE_LEN:
46 bitwise->len = *((
unsigned int *)data);
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);
178 nftnl_expr_bitwise_json_parse(
struct nftnl_expr *e, json_t *root,
179 struct nftnl_parse_err *err)
185 if (nftnl_jansson_parse_reg(root,
"sreg", NFTNL_TYPE_U32, ®, err) == 0)
186 nftnl_expr_set_u32(e, NFTNL_EXPR_BITWISE_SREG, reg);
188 if (nftnl_jansson_parse_reg(root,
"dreg", NFTNL_TYPE_U32, ®, err) == 0)
189 nftnl_expr_set_u32(e, NFTNL_EXPR_BITWISE_DREG, reg);
191 if (nftnl_jansson_parse_val(root,
"len", NFTNL_TYPE_U32, &len, err) == 0)
192 nftnl_expr_set_u32(e, NFTNL_EXPR_BITWISE_LEN, len);
194 if (nftnl_jansson_data_reg_parse(root,
"mask", &bitwise->mask,
196 e->flags |= (1 << NFTNL_EXPR_BITWISE_MASK);
198 if (nftnl_jansson_data_reg_parse(root,
"xor", &bitwise->xor,
200 e->flags |= (1 << NFTNL_EXPR_BITWISE_XOR);
202 if (bitwise->mask.len != bitwise->xor.len)
212 static int nftnl_expr_bitwise_export(
char *buf,
size_t size,
213 const struct nftnl_expr *e,
int type)
216 NFTNL_BUF_INIT(b, buf, size);
218 if (e->flags & (1 << NFTNL_EXPR_BITWISE_SREG))
219 nftnl_buf_u32(&b, type, bitwise->sreg, SREG);
220 if (e->flags & (1 << NFTNL_EXPR_BITWISE_DREG))
221 nftnl_buf_u32(&b, type, bitwise->dreg, DREG);
222 if (e->flags & (1 << NFTNL_EXPR_BITWISE_LEN))
223 nftnl_buf_u32(&b, type, bitwise->len, LEN);
224 if (e->flags & (1 << NFTNL_EXPR_BITWISE_MASK))
225 nftnl_buf_reg(&b, type, &bitwise->mask, DATA_VALUE, MASK);
226 if (e->flags & (1 << NFTNL_EXPR_BITWISE_XOR))
227 nftnl_buf_reg(&b, type, &bitwise->xor, DATA_VALUE, XOR);
229 return nftnl_buf_done(&b);
232 static int nftnl_expr_bitwise_snprintf_default(
char *buf,
size_t size,
233 const struct nftnl_expr *e)
236 int remain = size, offset = 0, ret;
238 ret = snprintf(buf, remain,
"reg %u = (reg=%u & ",
239 bitwise->dreg, bitwise->sreg);
240 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
242 ret = nftnl_data_reg_snprintf(buf + offset, remain, &bitwise->mask,
243 NFTNL_OUTPUT_DEFAULT, 0, DATA_VALUE);
244 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
246 ret = snprintf(buf + offset, remain,
") ^ ");
247 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
249 ret = nftnl_data_reg_snprintf(buf + offset, remain, &bitwise->xor,
250 NFTNL_OUTPUT_DEFAULT, 0, DATA_VALUE);
251 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
257 nftnl_expr_bitwise_snprintf(
char *buf,
size_t size, uint32_t type,
258 uint32_t flags,
const struct nftnl_expr *e)
261 case NFTNL_OUTPUT_DEFAULT:
262 return nftnl_expr_bitwise_snprintf_default(buf, size, e);
263 case NFTNL_OUTPUT_XML:
264 case NFTNL_OUTPUT_JSON:
265 return nftnl_expr_bitwise_export(buf, size, e, type);
272 static bool nftnl_expr_bitwise_cmp(
const struct nftnl_expr *e1,
273 const struct nftnl_expr *e2)
279 if (e1->flags & (1 << NFTNL_EXPR_BITWISE_SREG))
280 eq &= (b1->sreg == b2->sreg);
281 if (e1->flags & (1 << NFTNL_EXPR_BITWISE_DREG))
282 eq &= (b1->dreg == b2->dreg);
283 if (e1->flags & (1 << NFTNL_EXPR_BITWISE_LEN))
284 eq &= (b1->len == b2->len);
285 if (e1->flags & (1 << NFTNL_EXPR_BITWISE_MASK))
286 eq &= nftnl_data_reg_cmp(&b1->mask, &b2->mask, DATA_VALUE);
287 if (e1->flags & (1 << NFTNL_EXPR_BITWISE_XOR))
288 eq &= nftnl_data_reg_cmp(&b1->xor, &b2->xor, DATA_VALUE);
293 struct expr_ops expr_ops_bitwise = {
296 .max_attr = NFTA_BITWISE_MAX,
297 .cmp = nftnl_expr_bitwise_cmp,
298 .set = nftnl_expr_bitwise_set,
299 .get = nftnl_expr_bitwise_get,
300 .parse = nftnl_expr_bitwise_parse,
301 .build = nftnl_expr_bitwise_build,
302 .snprintf = nftnl_expr_bitwise_snprintf,
303 .json_parse = nftnl_expr_bitwise_json_parse,