15 #include <arpa/inet.h>
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;
30 static 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 range->sreg = *((uint32_t *)data);
39 case NFTNL_EXPR_RANGE_OP:
40 range->op = *((uint32_t *)data);
42 case NFTNL_EXPR_RANGE_FROM_DATA:
43 memcpy(&range->data_from.val, data, data_len);
44 range->data_from.len = data_len;
46 case NFTNL_EXPR_RANGE_TO_DATA:
47 memcpy(&range->data_to.val, data, data_len);
48 range->data_to.len = data_len;
56 static const void *nftnl_expr_range_get(
const struct nftnl_expr *e,
57 uint16_t type, uint32_t *data_len)
62 case NFTNL_EXPR_RANGE_SREG:
63 *data_len =
sizeof(range->sreg);
65 case NFTNL_EXPR_RANGE_OP:
66 *data_len =
sizeof(range->op);
68 case NFTNL_EXPR_RANGE_FROM_DATA:
69 *data_len = range->data_from.len;
70 return &range->data_from.val;
71 case NFTNL_EXPR_RANGE_TO_DATA:
72 *data_len = range->data_to.len;
73 return &range->data_to.val;
78 static int nftnl_expr_range_cb(
const struct nlattr *attr,
void *data)
80 const struct nlattr **tb = data;
81 int type = mnl_attr_get_type(attr);
83 if (mnl_attr_type_valid(attr, NFTA_RANGE_MAX) < 0)
89 if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
92 case NFTA_RANGE_FROM_DATA:
93 case NFTA_RANGE_TO_DATA:
94 if (mnl_attr_validate(attr, MNL_TYPE_BINARY) < 0)
104 nftnl_expr_range_build(
struct nlmsghdr *nlh,
const struct nftnl_expr *e)
108 if (e->flags & (1 << NFTNL_EXPR_RANGE_SREG))
109 mnl_attr_put_u32(nlh, NFTA_RANGE_SREG, htonl(range->sreg));
110 if (e->flags & (1 << NFTNL_EXPR_RANGE_OP))
111 mnl_attr_put_u32(nlh, NFTA_RANGE_OP, htonl(range->op));
112 if (e->flags & (1 << NFTNL_EXPR_RANGE_FROM_DATA)) {
115 nest = mnl_attr_nest_start(nlh, NFTA_RANGE_FROM_DATA);
116 mnl_attr_put(nlh, NFTA_DATA_VALUE, range->data_from.len,
117 range->data_from.val);
118 mnl_attr_nest_end(nlh, nest);
120 if (e->flags & (1 << NFTNL_EXPR_RANGE_TO_DATA)) {
123 nest = mnl_attr_nest_start(nlh, NFTA_RANGE_TO_DATA);
124 mnl_attr_put(nlh, NFTA_DATA_VALUE, range->data_to.len,
126 mnl_attr_nest_end(nlh, nest);
131 nftnl_expr_range_parse(
struct nftnl_expr *e,
struct nlattr *attr)
134 struct nlattr *tb[NFTA_RANGE_MAX+1] = {};
137 if (mnl_attr_parse_nested(attr, nftnl_expr_range_cb, tb) < 0)
140 if (tb[NFTA_RANGE_SREG]) {
141 range->sreg = ntohl(mnl_attr_get_u32(tb[NFTA_RANGE_SREG]));
142 e->flags |= (1 << NFTA_RANGE_SREG);
144 if (tb[NFTA_RANGE_OP]) {
145 range->op = ntohl(mnl_attr_get_u32(tb[NFTA_RANGE_OP]));
146 e->flags |= (1 << NFTA_RANGE_OP);
148 if (tb[NFTA_RANGE_FROM_DATA]) {
149 ret = nftnl_parse_data(&range->data_from,
150 tb[NFTA_RANGE_FROM_DATA], NULL);
151 e->flags |= (1 << NFTA_RANGE_FROM_DATA);
153 if (tb[NFTA_RANGE_TO_DATA]) {
154 ret = nftnl_parse_data(&range->data_to,
155 tb[NFTA_RANGE_TO_DATA], NULL);
156 e->flags |= (1 << NFTA_RANGE_TO_DATA);
162 static const char *expr_range_str[] = {
163 [NFT_RANGE_EQ] =
"eq",
164 [NFT_RANGE_NEQ] =
"neq",
167 static const char *range2str(uint32_t op)
169 if (op > NFT_RANGE_NEQ)
172 return expr_range_str[op];
175 static inline int nftnl_str2range(
const char *op)
177 if (strcmp(op,
"eq") == 0)
179 else if (strcmp(op,
"neq") == 0)
180 return NFT_RANGE_NEQ;
187 static int nftnl_expr_range_json_parse(
struct nftnl_expr *e, json_t *root,
188 struct nftnl_parse_err *err)
196 if (nftnl_jansson_parse_val(root,
"sreg", NFTNL_TYPE_U32, &uval32,
198 nftnl_expr_set_u32(e, NFTNL_EXPR_RANGE_SREG, uval32);
200 op = nftnl_jansson_parse_str(root,
"op", err);
202 base = nftnl_str2range(op);
206 nftnl_expr_set_u32(e, NFTNL_EXPR_RANGE_OP, base);
209 if (nftnl_jansson_data_reg_parse(root,
"data_from",
210 &range->data_from, err) == DATA_VALUE)
211 e->flags |= (1 << NFTNL_EXPR_RANGE_FROM_DATA);
213 if (nftnl_jansson_data_reg_parse(root,
"data_to",
214 &range->data_to, err) == DATA_VALUE)
215 e->flags |= (1 << NFTNL_EXPR_RANGE_TO_DATA);
224 static int nftnl_expr_range_export(
char *buf,
size_t size,
225 const struct nftnl_expr *e,
int type)
228 NFTNL_BUF_INIT(b, buf, size);
230 if (e->flags & (1 << NFTNL_EXPR_RANGE_SREG))
231 nftnl_buf_u32(&b, type, range->sreg, SREG);
232 if (e->flags & (1 << NFTNL_EXPR_RANGE_OP))
233 nftnl_buf_str(&b, type, range2str(range->op), OP);
234 if (e->flags & (1 << NFTNL_EXPR_RANGE_FROM_DATA))
235 nftnl_buf_reg(&b, type, &range->data_from, DATA_VALUE, DATA);
236 if (e->flags & (1 << NFTNL_EXPR_RANGE_TO_DATA))
237 nftnl_buf_reg(&b, type, &range->data_to, DATA_VALUE, DATA);
239 return nftnl_buf_done(&b);
242 static int nftnl_expr_range_snprintf_default(
char *buf,
size_t size,
243 const struct nftnl_expr *e)
246 int remain = size, offset = 0, ret;
248 ret = snprintf(buf, remain,
"%s reg %u ",
249 expr_range_str[range->op], range->sreg);
250 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
252 ret = nftnl_data_reg_snprintf(buf + offset, remain, &range->data_from,
253 NFTNL_OUTPUT_DEFAULT, 0, DATA_VALUE);
254 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
256 ret = nftnl_data_reg_snprintf(buf + offset, remain, &range->data_to,
257 NFTNL_OUTPUT_DEFAULT, 0, DATA_VALUE);
258 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
263 static int nftnl_expr_range_snprintf(
char *buf,
size_t size, uint32_t type,
264 uint32_t flags,
const struct nftnl_expr *e)
267 case NFTNL_OUTPUT_DEFAULT:
268 return nftnl_expr_range_snprintf_default(buf, size, e);
269 case NFTNL_OUTPUT_XML:
270 case NFTNL_OUTPUT_JSON:
271 return nftnl_expr_range_export(buf, size, e, type);
278 struct expr_ops expr_ops_range = {
281 .max_attr = NFTA_RANGE_MAX,
282 .set = nftnl_expr_range_set,
283 .get = nftnl_expr_range_get,
284 .parse = nftnl_expr_range_parse,
285 .build = nftnl_expr_range_build,
286 .snprintf = nftnl_expr_range_snprintf,
287 .json_parse = nftnl_expr_range_json_parse,