17 #include <arpa/inet.h>
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;
32 nftnl_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 cmp->sreg = *((uint32_t *)data);
41 case NFTNL_EXPR_CMP_OP:
42 cmp->op = *((uint32_t *)data);
44 case NFTNL_EXPR_CMP_DATA:
45 memcpy(&cmp->data.val, data, data_len);
46 cmp->data.len = data_len;
55 nftnl_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;
74 static 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)
99 nftnl_expr_cmp_build(
struct nlmsghdr *nlh,
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);
117 nftnl_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);
142 static char *expr_cmp_str[] = {
144 [NFT_CMP_NEQ] =
"neq",
146 [NFT_CMP_LTE] =
"lte",
148 [NFT_CMP_GTE] =
"gte",
151 static const char *cmp2str(uint32_t op)
153 if (op > NFT_CMP_GTE)
156 return expr_cmp_str[op];
159 static 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)
179 static int nftnl_expr_cmp_json_parse(
struct nftnl_expr *e, json_t *root,
180 struct nftnl_parse_err *err)
188 if (nftnl_jansson_parse_val(root,
"sreg", NFTNL_TYPE_U32, &uval32,
190 nftnl_expr_set_u32(e, NFTNL_EXPR_CMP_SREG, uval32);
192 op = nftnl_jansson_parse_str(root,
"op", err);
194 base = nftnl_str2cmp(op);
198 nftnl_expr_set_u32(e, NFTNL_EXPR_CMP_OP, base);
201 if (nftnl_jansson_data_reg_parse(root,
"data",
202 &cmp->data, err) == DATA_VALUE)
203 e->flags |= (1 << NFTNL_EXPR_CMP_DATA);
212 static int nftnl_expr_cmp_xml_parse(
struct nftnl_expr *e, mxml_node_t *tree,
213 struct nftnl_parse_err *err)
221 if (nftnl_mxml_reg_parse(tree,
"sreg", &sreg, MXML_DESCEND_FIRST,
222 NFTNL_XML_MAND, err) == 0)
223 nftnl_expr_set_u32(e, NFTNL_EXPR_CMP_SREG, sreg);
225 op = nftnl_mxml_str_parse(tree,
"op", MXML_DESCEND_FIRST, NFTNL_XML_MAND,
228 op_value = nftnl_str2cmp(op);
232 nftnl_expr_set_u32(e, NFTNL_EXPR_CMP_OP, op_value);
235 if (nftnl_mxml_data_reg_parse(tree,
"data",
236 &cmp->data, NFTNL_XML_MAND,
238 e->flags |= (1 << NFTNL_EXPR_CMP_DATA);
247 static int nftnl_expr_cmp_export(
char *buf,
size_t size,
248 struct nftnl_expr *e,
int type)
251 NFTNL_BUF_INIT(b, buf, size);
253 if (e->flags & (1 << NFTNL_EXPR_CMP_SREG))
254 nftnl_buf_u32(&b, type, cmp->sreg, SREG);
255 if (e->flags & (1 << NFTNL_EXPR_CMP_OP))
256 nftnl_buf_str(&b, type, cmp2str(cmp->op), OP);
257 if (e->flags & (1 << NFTNL_EXPR_CMP_DATA))
258 nftnl_buf_reg(&b, type, &cmp->data, DATA_VALUE, DATA);
260 return nftnl_buf_done(&b);
263 static int nftnl_expr_cmp_snprintf_default(
char *buf,
size_t size,
264 struct nftnl_expr *e)
267 int len = size, offset = 0, ret;
269 ret = snprintf(buf, len,
"%s reg %u ",
270 expr_cmp_str[cmp->op], cmp->sreg);
271 SNPRINTF_BUFFER_SIZE(ret, size, len, offset);
273 ret = nftnl_data_reg_snprintf(buf+offset, len, &cmp->data,
274 NFTNL_OUTPUT_DEFAULT, 0, DATA_VALUE);
275 SNPRINTF_BUFFER_SIZE(ret, size, len, offset);
281 nftnl_expr_cmp_snprintf(
char *buf,
size_t size, uint32_t type,
282 uint32_t flags,
struct nftnl_expr *e)
285 case NFTNL_OUTPUT_DEFAULT:
286 return nftnl_expr_cmp_snprintf_default(buf, size, e);
287 case NFTNL_OUTPUT_XML:
288 case NFTNL_OUTPUT_JSON:
289 return nftnl_expr_cmp_export(buf, size, e, type);
296 struct expr_ops expr_ops_cmp = {
299 .max_attr = NFTA_CMP_MAX,
300 .set = nftnl_expr_cmp_set,
301 .get = nftnl_expr_cmp_get,
302 .parse = nftnl_expr_cmp_parse,
303 .build = nftnl_expr_cmp_build,
304 .snprintf = nftnl_expr_cmp_snprintf,
305 .xml_parse = nftnl_expr_cmp_xml_parse,
306 .json_parse = nftnl_expr_cmp_json_parse,