11 #include <linux/netfilter/nf_tables.h>
14 #include <libmnl/libmnl.h>
15 #include <libnftnl/expr.h>
16 #include <libnftnl/rule.h>
19 enum nft_socket_keys key;
20 enum nft_registers dreg;
25 nftnl_expr_socket_set(
struct nftnl_expr *e, uint16_t type,
26 const void *data, uint32_t data_len)
31 case NFTNL_EXPR_SOCKET_KEY:
32 memcpy(&socket->key, data, data_len);
34 case NFTNL_EXPR_SOCKET_DREG:
35 memcpy(&socket->dreg, data, data_len);
37 case NFTNL_EXPR_SOCKET_LEVEL:
38 memcpy(&socket->level, data, data_len);
45 nftnl_expr_socket_get(
const struct nftnl_expr *e, uint16_t type,
51 case NFTNL_EXPR_SOCKET_KEY:
52 *data_len =
sizeof(socket->key);
54 case NFTNL_EXPR_SOCKET_DREG:
55 *data_len =
sizeof(socket->dreg);
57 case NFTNL_EXPR_SOCKET_LEVEL:
58 *data_len =
sizeof(socket->level);
59 return &socket->level;
64 static int nftnl_expr_socket_cb(
const struct nlattr *attr,
void *data)
66 const struct nlattr **tb = data;
67 int type = mnl_attr_get_type(attr);
69 if (mnl_attr_type_valid(attr, NFTA_SOCKET_MAX) < 0)
74 case NFTA_SOCKET_DREG:
75 case NFTA_SOCKET_LEVEL:
76 if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
86 nftnl_expr_socket_build(
struct nlmsghdr *nlh,
const struct nftnl_expr *e)
90 if (e->flags & (1 << NFTNL_EXPR_SOCKET_KEY))
91 mnl_attr_put_u32(nlh, NFTA_SOCKET_KEY, htonl(socket->key));
92 if (e->flags & (1 << NFTNL_EXPR_SOCKET_DREG))
93 mnl_attr_put_u32(nlh, NFTA_SOCKET_DREG, htonl(socket->dreg));
94 if (e->flags & (1 << NFTNL_EXPR_SOCKET_LEVEL))
95 mnl_attr_put_u32(nlh, NFTA_SOCKET_LEVEL, htonl(socket->level));
99 nftnl_expr_socket_parse(
struct nftnl_expr *e,
struct nlattr *attr)
102 struct nlattr *tb[NFTA_SOCKET_MAX+1] = {};
104 if (mnl_attr_parse_nested(attr, nftnl_expr_socket_cb, tb) < 0)
107 if (tb[NFTA_SOCKET_KEY]) {
108 socket->key = ntohl(mnl_attr_get_u32(tb[NFTA_SOCKET_KEY]));
109 e->flags |= (1 << NFTNL_EXPR_SOCKET_KEY);
111 if (tb[NFTA_SOCKET_DREG]) {
112 socket->dreg = ntohl(mnl_attr_get_u32(tb[NFTA_SOCKET_DREG]));
113 e->flags |= (1 << NFTNL_EXPR_SOCKET_DREG);
115 if (tb[NFTA_SOCKET_LEVEL]) {
116 socket->level = ntohl(mnl_attr_get_u32(tb[NFTA_SOCKET_LEVEL]));
117 e->flags |= (1 << NFTNL_EXPR_SOCKET_LEVEL);
123 static const char *socket_key2str_array[NFT_SOCKET_MAX + 1] = {
124 [NFT_SOCKET_TRANSPARENT] =
"transparent",
125 [NFT_SOCKET_MARK] =
"mark",
126 [NFT_SOCKET_WILDCARD] =
"wildcard",
127 [NFT_SOCKET_CGROUPV2] =
"cgroupv2",
130 static const char *socket_key2str(uint8_t key)
132 if (key < NFT_SOCKET_MAX + 1)
133 return socket_key2str_array[key];
139 nftnl_expr_socket_snprintf(
char *buf,
size_t len,
140 uint32_t flags,
const struct nftnl_expr *e)
144 if (e->flags & (1 << NFTNL_EXPR_SOCKET_DREG)) {
145 return snprintf(buf, len,
"load %s => reg %u ",
146 socket_key2str(socket->key), socket->dreg);
148 if (e->flags & (1 << NFTNL_EXPR_SOCKET_LEVEL))
149 return snprintf(buf, len,
"level %u ", socket->level);
154 static struct attr_policy socket_attr_policy[__NFTNL_EXPR_SOCKET_MAX] = {
155 [NFTNL_EXPR_SOCKET_KEY] = { .maxlen =
sizeof(uint32_t) },
156 [NFTNL_EXPR_SOCKET_DREG] = { .maxlen =
sizeof(uint32_t) },
157 [NFTNL_EXPR_SOCKET_LEVEL] = { .maxlen =
sizeof(uint32_t) },
160 struct expr_ops expr_ops_socket = {
163 .nftnl_max_attr = __NFTNL_EXPR_SOCKET_MAX - 1,
164 .attr_policy = socket_attr_policy,
165 .set = nftnl_expr_socket_set,
166 .get = nftnl_expr_socket_get,
167 .parse = nftnl_expr_socket_parse,
168 .build = nftnl_expr_socket_build,
169 .output = nftnl_expr_socket_snprintf,