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;
33nftnl_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 memcpy(&lookup->sreg, data, data_len);
42 case NFTNL_EXPR_LOOKUP_DREG:
43 memcpy(&lookup->dreg, data, data_len);
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 memcpy(&lookup->set_id, data, data_len);
53 case NFTNL_EXPR_LOOKUP_FLAGS:
54 memcpy(&lookup->flags, data, data_len);
61nftnl_expr_lookup_get(
const struct nftnl_expr *e, uint16_t type,
67 case NFTNL_EXPR_LOOKUP_SREG:
68 *data_len =
sizeof(lookup->sreg);
70 case NFTNL_EXPR_LOOKUP_DREG:
71 *data_len =
sizeof(lookup->dreg);
73 case NFTNL_EXPR_LOOKUP_SET:
74 *data_len = strlen(lookup->set_name) + 1;
75 return lookup->set_name;
76 case NFTNL_EXPR_LOOKUP_SET_ID:
77 *data_len =
sizeof(lookup->set_id);
78 return &lookup->set_id;
79 case NFTNL_EXPR_LOOKUP_FLAGS:
80 *data_len =
sizeof(lookup->flags);
81 return &lookup->flags;
86static int nftnl_expr_lookup_cb(
const struct nlattr *attr,
void *data)
88 const struct nlattr **tb = data;
89 int type = mnl_attr_get_type(attr);
91 if (mnl_attr_type_valid(attr, NFTA_LOOKUP_MAX) < 0)
95 case NFTA_LOOKUP_SREG:
96 case NFTA_LOOKUP_DREG:
97 case NFTA_LOOKUP_SET_ID:
98 case NFTA_LOOKUP_FLAGS:
99 if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
102 case NFTA_LOOKUP_SET:
103 if (mnl_attr_validate(attr, MNL_TYPE_STRING) < 0)
113nftnl_expr_lookup_build(
struct nlmsghdr *nlh,
const struct nftnl_expr *e)
117 if (e->flags & (1 << NFTNL_EXPR_LOOKUP_SREG))
118 mnl_attr_put_u32(nlh, NFTA_LOOKUP_SREG, htonl(lookup->sreg));
119 if (e->flags & (1 << NFTNL_EXPR_LOOKUP_DREG))
120 mnl_attr_put_u32(nlh, NFTA_LOOKUP_DREG, htonl(lookup->dreg));
121 if (e->flags & (1 << NFTNL_EXPR_LOOKUP_SET))
122 mnl_attr_put_strz(nlh, NFTA_LOOKUP_SET, lookup->set_name);
123 if (e->flags & (1 << NFTNL_EXPR_LOOKUP_SET_ID))
124 mnl_attr_put_u32(nlh, NFTA_LOOKUP_SET_ID,
125 htonl(lookup->set_id));
126 if (e->flags & (1 << NFTNL_EXPR_LOOKUP_FLAGS))
127 mnl_attr_put_u32(nlh, NFTA_LOOKUP_FLAGS, htonl(lookup->flags));
131nftnl_expr_lookup_parse(
struct nftnl_expr *e,
struct nlattr *attr)
134 struct nlattr *tb[NFTA_LOOKUP_MAX+1] = {};
137 if (mnl_attr_parse_nested(attr, nftnl_expr_lookup_cb, tb) < 0)
140 if (tb[NFTA_LOOKUP_SREG]) {
141 lookup->sreg = ntohl(mnl_attr_get_u32(tb[NFTA_LOOKUP_SREG]));
142 e->flags |= (1 << NFTNL_EXPR_LOOKUP_SREG);
144 if (tb[NFTA_LOOKUP_DREG]) {
145 lookup->dreg = ntohl(mnl_attr_get_u32(tb[NFTA_LOOKUP_DREG]));
146 e->flags |= (1 << NFTNL_EXPR_LOOKUP_DREG);
148 if (tb[NFTA_LOOKUP_SET]) {
150 strdup(mnl_attr_get_str(tb[NFTA_LOOKUP_SET]));
151 if (!lookup->set_name)
153 e->flags |= (1 << NFTNL_EXPR_LOOKUP_SET);
155 if (tb[NFTA_LOOKUP_SET_ID]) {
157 ntohl(mnl_attr_get_u32(tb[NFTA_LOOKUP_SET_ID]));
158 e->flags |= (1 << NFTNL_EXPR_LOOKUP_SET_ID);
160 if (tb[NFTA_LOOKUP_FLAGS]) {
161 lookup->flags = ntohl(mnl_attr_get_u32(tb[NFTA_LOOKUP_FLAGS]));
162 e->flags |= (1 << NFTNL_EXPR_LOOKUP_FLAGS);
169nftnl_expr_lookup_snprintf(
char *buf,
size_t remain,
170 uint32_t flags,
const struct nftnl_expr *e)
175 ret = snprintf(buf, remain,
"reg %u set %s ", l->sreg, l->set_name);
176 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
178 if (e->flags & (1 << NFTNL_EXPR_LOOKUP_DREG)) {
179 ret = snprintf(buf + offset, remain,
"dreg %u ", l->dreg);
180 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
183 if (e->flags & (1 << NFTNL_EXPR_LOOKUP_FLAGS)) {
184 ret = snprintf(buf + offset, remain,
"0x%x ", l->flags);
185 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
191static void nftnl_expr_lookup_free(
const struct nftnl_expr *e)
195 xfree(lookup->set_name);
198static struct attr_policy lookup_attr_policy[__NFTNL_EXPR_LOOKUP_MAX] = {
199 [NFTNL_EXPR_LOOKUP_SREG] = { .maxlen =
sizeof(uint32_t) },
200 [NFTNL_EXPR_LOOKUP_DREG] = { .maxlen =
sizeof(uint32_t) },
201 [NFTNL_EXPR_LOOKUP_SET] = { .maxlen = NFT_SET_MAXNAMELEN },
202 [NFTNL_EXPR_LOOKUP_SET_ID] = { .maxlen =
sizeof(uint32_t) },
203 [NFTNL_EXPR_LOOKUP_FLAGS] = { .maxlen =
sizeof(uint32_t) },
206struct expr_ops expr_ops_lookup = {
209 .nftnl_max_attr = __NFTNL_EXPR_LOOKUP_MAX - 1,
210 .attr_policy = lookup_attr_policy,
211 .free = nftnl_expr_lookup_free,
212 .set = nftnl_expr_lookup_set,
213 .get = nftnl_expr_lookup_get,
214 .parse = nftnl_expr_lookup_parse,
215 .build = nftnl_expr_lookup_build,
216 .output = nftnl_expr_lookup_snprintf,