11 #include <arpa/inet.h>
13 #include <linux/netfilter/nf_tables.h>
16 #include <libmnl/libmnl.h>
17 #include <libnftnl/expr.h>
18 #include <libnftnl/rule.h>
21 #define NFT_META_MAX (NFT_META_BRI_BROUTE + 1)
25 enum nft_meta_keys key;
26 enum nft_registers dreg;
27 enum nft_registers sreg;
31 nftnl_expr_meta_set(
struct nftnl_expr *e, uint16_t type,
32 const void *data, uint32_t data_len)
37 case NFTNL_EXPR_META_KEY:
38 memcpy(&meta->key, data, data_len);
40 case NFTNL_EXPR_META_DREG:
41 memcpy(&meta->dreg, data, data_len);
43 case NFTNL_EXPR_META_SREG:
44 memcpy(&meta->sreg, data, data_len);
51 nftnl_expr_meta_get(
const struct nftnl_expr *e, uint16_t type,
57 case NFTNL_EXPR_META_KEY:
58 *data_len =
sizeof(meta->key);
60 case NFTNL_EXPR_META_DREG:
61 *data_len =
sizeof(meta->dreg);
63 case NFTNL_EXPR_META_SREG:
64 *data_len =
sizeof(meta->sreg);
70 static int nftnl_expr_meta_cb(
const struct nlattr *attr,
void *data)
72 const struct nlattr **tb = data;
73 int type = mnl_attr_get_type(attr);
75 if (mnl_attr_type_valid(attr, NFTA_META_MAX) < 0)
82 if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
92 nftnl_expr_meta_build(
struct nlmsghdr *nlh,
const struct nftnl_expr *e)
96 if (e->flags & (1 << NFTNL_EXPR_META_KEY))
97 mnl_attr_put_u32(nlh, NFTA_META_KEY, htonl(meta->key));
98 if (e->flags & (1 << NFTNL_EXPR_META_DREG))
99 mnl_attr_put_u32(nlh, NFTA_META_DREG, htonl(meta->dreg));
100 if (e->flags & (1 << NFTNL_EXPR_META_SREG))
101 mnl_attr_put_u32(nlh, NFTA_META_SREG, htonl(meta->sreg));
105 nftnl_expr_meta_parse(
struct nftnl_expr *e,
struct nlattr *attr)
108 struct nlattr *tb[NFTA_META_MAX+1] = {};
110 if (mnl_attr_parse_nested(attr, nftnl_expr_meta_cb, tb) < 0)
113 if (tb[NFTA_META_KEY]) {
114 meta->key = ntohl(mnl_attr_get_u32(tb[NFTA_META_KEY]));
115 e->flags |= (1 << NFTNL_EXPR_META_KEY);
117 if (tb[NFTA_META_DREG]) {
118 meta->dreg = ntohl(mnl_attr_get_u32(tb[NFTA_META_DREG]));
119 e->flags |= (1 << NFTNL_EXPR_META_DREG);
121 if (tb[NFTA_META_SREG]) {
122 meta->sreg = ntohl(mnl_attr_get_u32(tb[NFTA_META_SREG]));
123 e->flags |= (1 << NFTNL_EXPR_META_SREG);
129 static const char *meta_key2str_array[NFT_META_MAX] = {
130 [NFT_META_LEN] =
"len",
131 [NFT_META_PROTOCOL] =
"protocol",
132 [NFT_META_NFPROTO] =
"nfproto",
133 [NFT_META_L4PROTO] =
"l4proto",
134 [NFT_META_PRIORITY] =
"priority",
135 [NFT_META_MARK] =
"mark",
136 [NFT_META_IIF] =
"iif",
137 [NFT_META_OIF] =
"oif",
138 [NFT_META_IIFNAME] =
"iifname",
139 [NFT_META_OIFNAME] =
"oifname",
140 [NFT_META_IIFTYPE] =
"iiftype",
141 [NFT_META_OIFTYPE] =
"oiftype",
142 [NFT_META_SKUID] =
"skuid",
143 [NFT_META_SKGID] =
"skgid",
144 [NFT_META_NFTRACE] =
"nftrace",
145 [NFT_META_RTCLASSID] =
"rtclassid",
146 [NFT_META_SECMARK] =
"secmark",
147 [NFT_META_BRI_IIFNAME] =
"bri_iifname",
148 [NFT_META_BRI_OIFNAME] =
"bri_oifname",
149 [NFT_META_PKTTYPE] =
"pkttype",
150 [NFT_META_CPU] =
"cpu",
151 [NFT_META_IIFGROUP] =
"iifgroup",
152 [NFT_META_OIFGROUP] =
"oifgroup",
153 [NFT_META_CGROUP] =
"cgroup",
154 [NFT_META_PRANDOM] =
"prandom",
155 [NFT_META_SECPATH] =
"secpath",
156 [NFT_META_IIFKIND] =
"iifkind",
157 [NFT_META_OIFKIND] =
"oifkind",
158 [NFT_META_BRI_IIFPVID] =
"bri_iifpvid",
159 [NFT_META_BRI_IIFVPROTO] =
"bri_iifvproto",
160 [NFT_META_TIME_NS] =
"time",
161 [NFT_META_TIME_DAY] =
"day",
162 [NFT_META_TIME_HOUR] =
"hour",
163 [NFT_META_SDIF] =
"sdif",
164 [NFT_META_SDIFNAME] =
"sdifname",
165 [NFT_META_BRI_BROUTE] =
"broute",
168 static const char *meta_key2str(uint8_t key)
170 if (key < NFT_META_MAX)
171 return meta_key2str_array[key];
177 nftnl_expr_meta_snprintf(
char *buf,
size_t len,
178 uint32_t flags,
const struct nftnl_expr *e)
182 if (e->flags & (1 << NFTNL_EXPR_META_SREG)) {
183 return snprintf(buf, len,
"set %s with reg %u ",
184 meta_key2str(meta->key), meta->sreg);
186 if (e->flags & (1 << NFTNL_EXPR_META_DREG)) {
187 return snprintf(buf, len,
"load %s => reg %u ",
188 meta_key2str(meta->key), meta->dreg);
193 static struct attr_policy meta_attr_policy[__NFTNL_EXPR_META_MAX] = {
194 [NFTNL_EXPR_META_KEY] = { .maxlen =
sizeof(uint32_t) },
195 [NFTNL_EXPR_META_DREG] = { .maxlen =
sizeof(uint32_t) },
196 [NFTNL_EXPR_META_SREG] = { .maxlen =
sizeof(uint32_t) },
199 struct expr_ops expr_ops_meta = {
202 .nftnl_max_attr = __NFTNL_EXPR_META_MAX - 1,
203 .attr_policy = meta_attr_policy,
204 .set = nftnl_expr_meta_set,
205 .get = nftnl_expr_meta_get,
206 .parse = nftnl_expr_meta_parse,
207 .build = nftnl_expr_meta_build,
208 .output = nftnl_expr_meta_snprintf,