15#include <libmnl/libmnl.h>
16#include <linux/netfilter/nf_tables.h>
17#include <libnftnl/rule.h>
18#include <libnftnl/expr.h>
21 enum nft_registers sreg;
22 enum nft_registers dreg;
29nftnl_expr_lookup_set(
struct nftnl_expr *e, uint16_t type,
30 const void *data, uint32_t data_len)
35 case NFTNL_EXPR_LOOKUP_SREG:
36 memcpy(&lookup->sreg, data, data_len);
38 case NFTNL_EXPR_LOOKUP_DREG:
39 memcpy(&lookup->dreg, data, data_len);
41 case NFTNL_EXPR_LOOKUP_SET:
42 lookup->set_name = strdup((
const char *)data);
43 if (!lookup->set_name)
46 case NFTNL_EXPR_LOOKUP_SET_ID:
47 memcpy(&lookup->set_id, data, data_len);
49 case NFTNL_EXPR_LOOKUP_FLAGS:
50 memcpy(&lookup->flags, data, data_len);
57nftnl_expr_lookup_get(
const struct nftnl_expr *e, uint16_t type,
63 case NFTNL_EXPR_LOOKUP_SREG:
64 *data_len =
sizeof(lookup->sreg);
66 case NFTNL_EXPR_LOOKUP_DREG:
67 *data_len =
sizeof(lookup->dreg);
69 case NFTNL_EXPR_LOOKUP_SET:
70 *data_len = strlen(lookup->set_name) + 1;
71 return lookup->set_name;
72 case NFTNL_EXPR_LOOKUP_SET_ID:
73 *data_len =
sizeof(lookup->set_id);
74 return &lookup->set_id;
75 case NFTNL_EXPR_LOOKUP_FLAGS:
76 *data_len =
sizeof(lookup->flags);
77 return &lookup->flags;
82static int nftnl_expr_lookup_cb(
const struct nlattr *attr,
void *data)
84 const struct nlattr **tb = data;
85 int type = mnl_attr_get_type(attr);
87 if (mnl_attr_type_valid(attr, NFTA_LOOKUP_MAX) < 0)
91 case NFTA_LOOKUP_SREG:
92 case NFTA_LOOKUP_DREG:
93 case NFTA_LOOKUP_SET_ID:
94 case NFTA_LOOKUP_FLAGS:
95 if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
99 if (mnl_attr_validate(attr, MNL_TYPE_STRING) < 0)
109nftnl_expr_lookup_build(
struct nlmsghdr *nlh,
const struct nftnl_expr *e)
113 if (e->flags & (1 << NFTNL_EXPR_LOOKUP_SREG))
114 mnl_attr_put_u32(nlh, NFTA_LOOKUP_SREG, htonl(lookup->sreg));
115 if (e->flags & (1 << NFTNL_EXPR_LOOKUP_DREG))
116 mnl_attr_put_u32(nlh, NFTA_LOOKUP_DREG, htonl(lookup->dreg));
117 if (e->flags & (1 << NFTNL_EXPR_LOOKUP_SET))
118 mnl_attr_put_strz(nlh, NFTA_LOOKUP_SET, lookup->set_name);
119 if (e->flags & (1 << NFTNL_EXPR_LOOKUP_SET_ID))
120 mnl_attr_put_u32(nlh, NFTA_LOOKUP_SET_ID,
121 htonl(lookup->set_id));
122 if (e->flags & (1 << NFTNL_EXPR_LOOKUP_FLAGS))
123 mnl_attr_put_u32(nlh, NFTA_LOOKUP_FLAGS, htonl(lookup->flags));
127nftnl_expr_lookup_parse(
struct nftnl_expr *e,
struct nlattr *attr)
130 struct nlattr *tb[NFTA_LOOKUP_MAX+1] = {};
133 if (mnl_attr_parse_nested(attr, nftnl_expr_lookup_cb, tb) < 0)
136 if (tb[NFTA_LOOKUP_SREG]) {
137 lookup->sreg = ntohl(mnl_attr_get_u32(tb[NFTA_LOOKUP_SREG]));
138 e->flags |= (1 << NFTNL_EXPR_LOOKUP_SREG);
140 if (tb[NFTA_LOOKUP_DREG]) {
141 lookup->dreg = ntohl(mnl_attr_get_u32(tb[NFTA_LOOKUP_DREG]));
142 e->flags |= (1 << NFTNL_EXPR_LOOKUP_DREG);
144 if (tb[NFTA_LOOKUP_SET]) {
146 strdup(mnl_attr_get_str(tb[NFTA_LOOKUP_SET]));
147 if (!lookup->set_name)
149 e->flags |= (1 << NFTNL_EXPR_LOOKUP_SET);
151 if (tb[NFTA_LOOKUP_SET_ID]) {
153 ntohl(mnl_attr_get_u32(tb[NFTA_LOOKUP_SET_ID]));
154 e->flags |= (1 << NFTNL_EXPR_LOOKUP_SET_ID);
156 if (tb[NFTA_LOOKUP_FLAGS]) {
157 lookup->flags = ntohl(mnl_attr_get_u32(tb[NFTA_LOOKUP_FLAGS]));
158 e->flags |= (1 << NFTNL_EXPR_LOOKUP_FLAGS);
165nftnl_expr_lookup_snprintf(
char *buf,
size_t remain,
166 uint32_t flags,
const struct nftnl_expr *e)
171 ret = snprintf(buf, remain,
"reg %u set %s ", l->sreg, l->set_name);
172 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
174 if (e->flags & (1 << NFTNL_EXPR_LOOKUP_DREG)) {
175 ret = snprintf(buf + offset, remain,
"dreg %u ", l->dreg);
176 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
179 if (e->flags & (1 << NFTNL_EXPR_LOOKUP_FLAGS)) {
180 ret = snprintf(buf + offset, remain,
"0x%x ", l->flags);
181 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
187static void nftnl_expr_lookup_free(
const struct nftnl_expr *e)
191 xfree(lookup->set_name);
194static struct attr_policy lookup_attr_policy[__NFTNL_EXPR_LOOKUP_MAX] = {
195 [NFTNL_EXPR_LOOKUP_SREG] = { .maxlen =
sizeof(uint32_t) },
196 [NFTNL_EXPR_LOOKUP_DREG] = { .maxlen =
sizeof(uint32_t) },
197 [NFTNL_EXPR_LOOKUP_SET] = { .maxlen = NFT_SET_MAXNAMELEN },
198 [NFTNL_EXPR_LOOKUP_SET_ID] = { .maxlen =
sizeof(uint32_t) },
199 [NFTNL_EXPR_LOOKUP_FLAGS] = { .maxlen =
sizeof(uint32_t) },
202struct expr_ops expr_ops_lookup = {
205 .nftnl_max_attr = __NFTNL_EXPR_LOOKUP_MAX - 1,
206 .attr_policy = lookup_attr_policy,
207 .free = nftnl_expr_lookup_free,
208 .set = nftnl_expr_lookup_set,
209 .get = nftnl_expr_lookup_get,
210 .parse = nftnl_expr_lookup_parse,
211 .build = nftnl_expr_lookup_build,
212 .output = nftnl_expr_lookup_snprintf,