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,
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)
213 nftnl_expr_bitwise_xml_parse(
struct nftnl_expr *e, mxml_node_t *tree,
214 struct nftnl_parse_err *err)
218 uint32_t sreg, dreg, len;
220 if (nftnl_mxml_reg_parse(tree,
"sreg", &sreg, MXML_DESCEND_FIRST,
221 NFTNL_XML_MAND, err) == 0)
222 nftnl_expr_set_u32(e, NFTNL_EXPR_BITWISE_SREG, sreg);
224 if (nftnl_mxml_reg_parse(tree,
"dreg", &dreg, MXML_DESCEND_FIRST,
225 NFTNL_XML_MAND, err) == 0)
226 nftnl_expr_set_u32(e, NFTNL_EXPR_BITWISE_DREG, dreg);
228 if (nftnl_mxml_num_parse(tree,
"len", MXML_DESCEND_FIRST, BASE_DEC,
229 &len, NFTNL_TYPE_U32, NFTNL_XML_MAND, err) == 0)
230 nftnl_expr_set_u32(e, NFTNL_EXPR_BITWISE_LEN, len);
232 if (nftnl_mxml_data_reg_parse(tree,
"mask", &bitwise->mask, NFTNL_XML_MAND,
234 e->flags |= (1 << NFTNL_EXPR_BITWISE_MASK);
236 if (nftnl_mxml_data_reg_parse(tree,
"xor", &bitwise->xor, NFTNL_XML_MAND,
238 e->flags |= (1 << NFTNL_EXPR_BITWISE_XOR);
243 if (bitwise->mask.len != bitwise->xor.len)
253 static int nftnl_expr_bitwise_export(
char *buf,
size_t size,
254 struct nftnl_expr *e,
int type)
257 NFTNL_BUF_INIT(b, buf, size);
259 if (e->flags & (1 << NFTNL_EXPR_BITWISE_SREG))
260 nftnl_buf_u32(&b, type, bitwise->sreg, SREG);
261 if (e->flags & (1 << NFTNL_EXPR_BITWISE_DREG))
262 nftnl_buf_u32(&b, type, bitwise->dreg, DREG);
263 if (e->flags & (1 << NFTNL_EXPR_BITWISE_LEN))
264 nftnl_buf_u32(&b, type, bitwise->len, LEN);
265 if (e->flags & (1 << NFTNL_EXPR_BITWISE_MASK))
266 nftnl_buf_reg(&b, type, &bitwise->mask, DATA_VALUE, MASK);
267 if (e->flags & (1 << NFTNL_EXPR_BITWISE_XOR))
268 nftnl_buf_reg(&b, type, &bitwise->xor, DATA_VALUE, XOR);
270 return nftnl_buf_done(&b);
273 static int nftnl_expr_bitwise_snprintf_default(
char *buf,
size_t size,
274 struct nftnl_expr *e)
277 int len = size, offset = 0, ret;
279 ret = snprintf(buf, len,
"reg %u = (reg=%u & ",
280 bitwise->dreg, bitwise->sreg);
281 SNPRINTF_BUFFER_SIZE(ret, size, len, offset);
283 ret = nftnl_data_reg_snprintf(buf+offset, len, &bitwise->mask,
284 NFTNL_OUTPUT_DEFAULT, 0, DATA_VALUE);
285 SNPRINTF_BUFFER_SIZE(ret, size, len, offset);
287 ret = snprintf(buf+offset, len,
") ^ ");
288 SNPRINTF_BUFFER_SIZE(ret, size, len, offset);
290 ret = nftnl_data_reg_snprintf(buf+offset, len, &bitwise->xor,
291 NFTNL_OUTPUT_DEFAULT, 0, DATA_VALUE);
292 SNPRINTF_BUFFER_SIZE(ret, size, len, offset);
298 nftnl_expr_bitwise_snprintf(
char *buf,
size_t size, uint32_t type,
299 uint32_t flags,
struct nftnl_expr *e)
302 case NFTNL_OUTPUT_DEFAULT:
303 return nftnl_expr_bitwise_snprintf_default(buf, size, e);
304 case NFTNL_OUTPUT_XML:
305 case NFTNL_OUTPUT_JSON:
306 return nftnl_expr_bitwise_export(buf, size, e, type);
313 struct expr_ops expr_ops_bitwise = {
316 .max_attr = NFTA_BITWISE_MAX,
317 .set = nftnl_expr_bitwise_set,
318 .get = nftnl_expr_bitwise_get,
319 .parse = nftnl_expr_bitwise_parse,
320 .build = nftnl_expr_bitwise_build,
321 .snprintf = nftnl_expr_bitwise_snprintf,
322 .xml_parse = nftnl_expr_bitwise_xml_parse,
323 .json_parse = nftnl_expr_bitwise_json_parse,