13 #include <arpa/inet.h>
15 #include <linux/netfilter/nf_tables.h>
18 #include <libmnl/libmnl.h>
19 #include <libnftnl/expr.h>
20 #include <libnftnl/rule.h>
23 enum nft_socket_keys key;
24 enum nft_registers dreg;
29 nftnl_expr_socket_set(
struct nftnl_expr *e, uint16_t type,
30 const void *data, uint32_t data_len)
35 case NFTNL_EXPR_SOCKET_KEY:
36 memcpy(&socket->key, data, data_len);
38 case NFTNL_EXPR_SOCKET_DREG:
39 memcpy(&socket->dreg, data, data_len);
41 case NFTNL_EXPR_SOCKET_LEVEL:
42 memcpy(&socket->level, data, data_len);
49 nftnl_expr_socket_get(
const struct nftnl_expr *e, uint16_t type,
55 case NFTNL_EXPR_SOCKET_KEY:
56 *data_len =
sizeof(socket->key);
58 case NFTNL_EXPR_SOCKET_DREG:
59 *data_len =
sizeof(socket->dreg);
61 case NFTNL_EXPR_SOCKET_LEVEL:
62 *data_len =
sizeof(socket->level);
63 return &socket->level;
68 static int nftnl_expr_socket_cb(
const struct nlattr *attr,
void *data)
70 const struct nlattr **tb = data;
71 int type = mnl_attr_get_type(attr);
73 if (mnl_attr_type_valid(attr, NFTA_SOCKET_MAX) < 0)
78 case NFTA_SOCKET_DREG:
79 case NFTA_SOCKET_LEVEL:
80 if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
90 nftnl_expr_socket_build(
struct nlmsghdr *nlh,
const struct nftnl_expr *e)
94 if (e->flags & (1 << NFTNL_EXPR_SOCKET_KEY))
95 mnl_attr_put_u32(nlh, NFTA_SOCKET_KEY, htonl(socket->key));
96 if (e->flags & (1 << NFTNL_EXPR_SOCKET_DREG))
97 mnl_attr_put_u32(nlh, NFTA_SOCKET_DREG, htonl(socket->dreg));
98 if (e->flags & (1 << NFTNL_EXPR_SOCKET_LEVEL))
99 mnl_attr_put_u32(nlh, NFTA_SOCKET_LEVEL, htonl(socket->level));
103 nftnl_expr_socket_parse(
struct nftnl_expr *e,
struct nlattr *attr)
106 struct nlattr *tb[NFTA_SOCKET_MAX+1] = {};
108 if (mnl_attr_parse_nested(attr, nftnl_expr_socket_cb, tb) < 0)
111 if (tb[NFTA_SOCKET_KEY]) {
112 socket->key = ntohl(mnl_attr_get_u32(tb[NFTA_SOCKET_KEY]));
113 e->flags |= (1 << NFTNL_EXPR_SOCKET_KEY);
115 if (tb[NFTA_SOCKET_DREG]) {
116 socket->dreg = ntohl(mnl_attr_get_u32(tb[NFTA_SOCKET_DREG]));
117 e->flags |= (1 << NFTNL_EXPR_SOCKET_DREG);
119 if (tb[NFTA_SOCKET_LEVEL]) {
120 socket->level = ntohl(mnl_attr_get_u32(tb[NFTA_SOCKET_LEVEL]));
121 e->flags |= (1 << NFTNL_EXPR_SOCKET_LEVEL);
127 static const char *socket_key2str_array[NFT_SOCKET_MAX + 1] = {
128 [NFT_SOCKET_TRANSPARENT] =
"transparent",
129 [NFT_SOCKET_MARK] =
"mark",
130 [NFT_SOCKET_WILDCARD] =
"wildcard",
131 [NFT_SOCKET_CGROUPV2] =
"cgroupv2",
134 static const char *socket_key2str(uint8_t key)
136 if (key < NFT_SOCKET_MAX + 1)
137 return socket_key2str_array[key];
143 nftnl_expr_socket_snprintf(
char *buf,
size_t len,
144 uint32_t flags,
const struct nftnl_expr *e)
148 if (e->flags & (1 << NFTNL_EXPR_SOCKET_DREG)) {
149 return snprintf(buf, len,
"load %s => reg %u ",
150 socket_key2str(socket->key), socket->dreg);
152 if (e->flags & (1 << NFTNL_EXPR_SOCKET_LEVEL))
153 return snprintf(buf, len,
"level %u ", socket->level);
158 static struct attr_policy socket_attr_policy[__NFTNL_EXPR_SOCKET_MAX] = {
159 [NFTNL_EXPR_SOCKET_KEY] = { .maxlen =
sizeof(uint32_t) },
160 [NFTNL_EXPR_SOCKET_DREG] = { .maxlen =
sizeof(uint32_t) },
161 [NFTNL_EXPR_SOCKET_LEVEL] = { .maxlen =
sizeof(uint32_t) },
164 struct expr_ops expr_ops_socket = {
167 .nftnl_max_attr = __NFTNL_EXPR_SOCKET_MAX - 1,
168 .attr_policy = socket_attr_policy,
169 .set = nftnl_expr_socket_set,
170 .get = nftnl_expr_socket_get,
171 .parse = nftnl_expr_socket_parse,
172 .build = nftnl_expr_socket_build,
173 .output = nftnl_expr_socket_snprintf,