17 #include <arpa/inet.h>
19 #include <libmnl/libmnl.h>
20 #include <linux/netfilter/nf_tables.h>
21 #include <libnftnl/rule.h>
22 #include <libnftnl/expr.h>
25 enum nft_registers sreg;
26 enum nft_registers dreg;
33 nftnl_expr_lookup_set(
struct nftnl_expr *e, uint16_t type,
34 const void *data, uint32_t data_len)
39 case NFTNL_EXPR_LOOKUP_SREG:
40 lookup->sreg = *((uint32_t *)data);
42 case NFTNL_EXPR_LOOKUP_DREG:
43 lookup->dreg = *((uint32_t *)data);
45 case NFTNL_EXPR_LOOKUP_SET:
46 lookup->set_name = strdup((
const char *)data);
47 if (!lookup->set_name)
50 case NFTNL_EXPR_LOOKUP_SET_ID:
51 lookup->set_id = *((uint32_t *)data);
53 case NFTNL_EXPR_LOOKUP_FLAGS:
54 lookup->flags = *((uint32_t *)data);
63 nftnl_expr_lookup_get(
const struct nftnl_expr *e, uint16_t type,
69 case NFTNL_EXPR_LOOKUP_SREG:
70 *data_len =
sizeof(lookup->sreg);
72 case NFTNL_EXPR_LOOKUP_DREG:
73 *data_len =
sizeof(lookup->dreg);
75 case NFTNL_EXPR_LOOKUP_SET:
76 *data_len = strlen(lookup->set_name) + 1;
77 return lookup->set_name;
78 case NFTNL_EXPR_LOOKUP_SET_ID:
79 *data_len =
sizeof(lookup->set_id);
80 return &lookup->set_id;
81 case NFTNL_EXPR_LOOKUP_FLAGS:
82 *data_len =
sizeof(lookup->flags);
83 return &lookup->flags;
88 static int nftnl_expr_lookup_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_LOOKUP_MAX) < 0)
97 case NFTA_LOOKUP_SREG:
98 case NFTA_LOOKUP_DREG:
99 case NFTA_LOOKUP_SET_ID:
100 case NFTA_LOOKUP_FLAGS:
101 if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
104 case NFTA_LOOKUP_SET:
105 if (mnl_attr_validate(attr, MNL_TYPE_STRING) < 0)
115 nftnl_expr_lookup_build(
struct nlmsghdr *nlh,
const struct nftnl_expr *e)
119 if (e->flags & (1 << NFTNL_EXPR_LOOKUP_SREG))
120 mnl_attr_put_u32(nlh, NFTA_LOOKUP_SREG, htonl(lookup->sreg));
121 if (e->flags & (1 << NFTNL_EXPR_LOOKUP_DREG))
122 mnl_attr_put_u32(nlh, NFTA_LOOKUP_DREG, htonl(lookup->dreg));
123 if (e->flags & (1 << NFTNL_EXPR_LOOKUP_SET))
124 mnl_attr_put_strz(nlh, NFTA_LOOKUP_SET, lookup->set_name);
125 if (e->flags & (1 << NFTNL_EXPR_LOOKUP_SET_ID))
126 mnl_attr_put_u32(nlh, NFTA_LOOKUP_SET_ID,
127 htonl(lookup->set_id));
128 if (e->flags & (1 << NFTNL_EXPR_LOOKUP_FLAGS))
129 mnl_attr_put_u32(nlh, NFTA_LOOKUP_FLAGS, htonl(lookup->flags));
133 nftnl_expr_lookup_parse(
struct nftnl_expr *e,
struct nlattr *attr)
136 struct nlattr *tb[NFTA_LOOKUP_MAX+1] = {};
139 if (mnl_attr_parse_nested(attr, nftnl_expr_lookup_cb, tb) < 0)
142 if (tb[NFTA_LOOKUP_SREG]) {
143 lookup->sreg = ntohl(mnl_attr_get_u32(tb[NFTA_LOOKUP_SREG]));
144 e->flags |= (1 << NFTNL_EXPR_LOOKUP_SREG);
146 if (tb[NFTA_LOOKUP_DREG]) {
147 lookup->dreg = ntohl(mnl_attr_get_u32(tb[NFTA_LOOKUP_DREG]));
148 e->flags |= (1 << NFTNL_EXPR_LOOKUP_DREG);
150 if (tb[NFTA_LOOKUP_SET]) {
152 strdup(mnl_attr_get_str(tb[NFTA_LOOKUP_SET]));
153 if (!lookup->set_name)
155 e->flags |= (1 << NFTNL_EXPR_LOOKUP_SET);
157 if (tb[NFTA_LOOKUP_SET_ID]) {
159 ntohl(mnl_attr_get_u32(tb[NFTA_LOOKUP_SET_ID]));
160 e->flags |= (1 << NFTNL_EXPR_LOOKUP_SET_ID);
162 if (tb[NFTA_LOOKUP_FLAGS]) {
163 lookup->flags = ntohl(mnl_attr_get_u32(tb[NFTA_LOOKUP_FLAGS]));
164 e->flags |= (1 << NFTNL_EXPR_LOOKUP_FLAGS);
171 nftnl_expr_lookup_json_parse(
struct nftnl_expr *e, json_t *root,
172 struct nftnl_parse_err *err)
175 const char *set_name;
176 uint32_t sreg, dreg, flags;
178 set_name = nftnl_jansson_parse_str(root,
"set", err);
179 if (set_name != NULL)
180 nftnl_expr_set_str(e, NFTNL_EXPR_LOOKUP_SET, set_name);
182 if (nftnl_jansson_parse_reg(root,
"sreg", NFTNL_TYPE_U32, &sreg, err) == 0)
183 nftnl_expr_set_u32(e, NFTNL_EXPR_LOOKUP_SREG, sreg);
185 if (nftnl_jansson_parse_reg(root,
"dreg", NFTNL_TYPE_U32, &dreg, err) == 0)
186 nftnl_expr_set_u32(e, NFTNL_EXPR_LOOKUP_DREG, dreg);
188 if (nftnl_jansson_parse_val(root,
"flags", NFTNL_TYPE_U32,
190 nftnl_expr_set_u32(e, NFTNL_EXPR_LOOKUP_FLAGS, flags);
200 nftnl_expr_lookup_export(
char *buf,
size_t size,
201 const struct nftnl_expr *e,
int type)
204 NFTNL_BUF_INIT(b, buf, size);
206 if (e->flags & (1 << NFTNL_EXPR_LOOKUP_SET))
207 nftnl_buf_str(&b, type, l->set_name, SET);
208 if (e->flags & (1 << NFTNL_EXPR_LOOKUP_SREG))
209 nftnl_buf_u32(&b, type, l->sreg, SREG);
210 if (e->flags & (1 << NFTNL_EXPR_LOOKUP_DREG))
211 nftnl_buf_u32(&b, type, l->dreg, DREG);
212 if (e->flags & (1 << NFTNL_EXPR_LOOKUP_FLAGS))
213 nftnl_buf_u32(&b, type, l->flags, FLAGS);
215 return nftnl_buf_done(&b);
219 nftnl_expr_lookup_snprintf_default(
char *buf,
size_t size,
220 const struct nftnl_expr *e)
222 int remain = size, offset = 0, ret;
225 ret = snprintf(buf, remain,
"reg %u set %s ", l->sreg, l->set_name);
226 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
228 if (e->flags & (1 << NFTNL_EXPR_LOOKUP_DREG)) {
229 ret = snprintf(buf + offset, remain,
"dreg %u ", l->dreg);
230 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
233 if (e->flags & (1 << NFTNL_EXPR_LOOKUP_FLAGS)) {
234 ret = snprintf(buf + offset, remain,
"0x%x ", l->flags);
235 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
242 nftnl_expr_lookup_snprintf(
char *buf,
size_t size, uint32_t type,
243 uint32_t flags,
const struct nftnl_expr *e)
246 case NFTNL_OUTPUT_DEFAULT:
247 return nftnl_expr_lookup_snprintf_default(buf, size, e);
248 case NFTNL_OUTPUT_XML:
249 case NFTNL_OUTPUT_JSON:
250 return nftnl_expr_lookup_export(buf, size, e, type);
257 static void nftnl_expr_lookup_free(
const struct nftnl_expr *e)
261 xfree(lookup->set_name);
264 static bool nftnl_expr_lookup_cmp(
const struct nftnl_expr *e1,
265 const struct nftnl_expr *e2)
271 if (e1->flags & (1 << NFTNL_EXPR_LOOKUP_SREG))
272 eq &= (l1->sreg == l2->sreg);
273 if (e1->flags & (1 << NFTNL_EXPR_LOOKUP_DREG))
274 eq &= (l1->dreg == l2->dreg);
275 if (e1->flags & (1 << NFTNL_EXPR_LOOKUP_SET))
276 eq &= !strcmp(l1->set_name, l2->set_name);
277 if (e1->flags & (1 << NFTNL_EXPR_LOOKUP_SET_ID))
278 eq &= (l1->set_id == l2->set_id);
279 if (e1->flags & (1 << NFTNL_EXPR_LOOKUP_FLAGS))
280 eq &= (l1->flags == l2->flags);
285 struct expr_ops expr_ops_lookup = {
288 .max_attr = NFTA_LOOKUP_MAX,
289 .free = nftnl_expr_lookup_free,
290 .cmp = nftnl_expr_lookup_cmp,
291 .set = nftnl_expr_lookup_set,
292 .get = nftnl_expr_lookup_get,
293 .parse = nftnl_expr_lookup_parse,
294 .build = nftnl_expr_lookup_build,
295 .snprintf = nftnl_expr_lookup_snprintf,
296 .json_parse = nftnl_expr_lookup_json_parse,