13 #include <arpa/inet.h>
16 #include <libmnl/libmnl.h>
17 #include <linux/netfilter/nf_tables.h>
18 #include <libnftnl/expr.h>
19 #include <libnftnl/rule.h>
24 enum nft_registers sreg_dev;
25 enum nft_registers sreg_addr;
29 static int nftnl_expr_fwd_set(
struct nftnl_expr *e, uint16_t type,
30 const void *data, uint32_t data_len)
35 case NFTNL_EXPR_FWD_SREG_DEV:
36 memcpy(&fwd->sreg_dev, data, data_len);
38 case NFTNL_EXPR_FWD_SREG_ADDR:
39 memcpy(&fwd->sreg_addr, data, data_len);
41 case NFTNL_EXPR_FWD_NFPROTO:
42 memcpy(&fwd->nfproto, data, data_len);
48 static const void *nftnl_expr_fwd_get(
const struct nftnl_expr *e,
49 uint16_t type, uint32_t *data_len)
54 case NFTNL_EXPR_FWD_SREG_DEV:
55 *data_len =
sizeof(fwd->sreg_dev);
56 return &fwd->sreg_dev;
57 case NFTNL_EXPR_FWD_SREG_ADDR:
58 *data_len =
sizeof(fwd->sreg_addr);
59 return &fwd->sreg_addr;
60 case NFTNL_EXPR_FWD_NFPROTO:
61 *data_len =
sizeof(fwd->nfproto);
67 static int nftnl_expr_fwd_cb(
const struct nlattr *attr,
void *data)
69 const struct nlattr **tb = data;
70 int type = mnl_attr_get_type(attr);
72 if (mnl_attr_type_valid(attr, NFTA_FWD_MAX) < 0)
76 case NFTA_FWD_SREG_DEV:
77 case NFTA_FWD_SREG_ADDR:
78 case NFTA_FWD_NFPROTO:
79 if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
88 static void nftnl_expr_fwd_build(
struct nlmsghdr *nlh,
89 const struct nftnl_expr *e)
93 if (e->flags & (1 << NFTNL_EXPR_FWD_SREG_DEV))
94 mnl_attr_put_u32(nlh, NFTA_FWD_SREG_DEV, htonl(fwd->sreg_dev));
95 if (e->flags & (1 << NFTNL_EXPR_FWD_SREG_ADDR))
96 mnl_attr_put_u32(nlh, NFTA_FWD_SREG_ADDR, htonl(fwd->sreg_addr));
97 if (e->flags & (1 << NFTNL_EXPR_FWD_NFPROTO))
98 mnl_attr_put_u32(nlh, NFTA_FWD_NFPROTO, htonl(fwd->nfproto));
101 static int nftnl_expr_fwd_parse(
struct nftnl_expr *e,
struct nlattr *attr)
104 struct nlattr *tb[NFTA_FWD_MAX + 1] = {};
107 if (mnl_attr_parse_nested(attr, nftnl_expr_fwd_cb, tb) < 0)
110 if (tb[NFTA_FWD_SREG_DEV]) {
111 fwd->sreg_dev = ntohl(mnl_attr_get_u32(tb[NFTA_FWD_SREG_DEV]));
112 e->flags |= (1 << NFTNL_EXPR_FWD_SREG_DEV);
114 if (tb[NFTA_FWD_SREG_ADDR]) {
115 fwd->sreg_addr = ntohl(mnl_attr_get_u32(tb[NFTA_FWD_SREG_ADDR]));
116 e->flags |= (1 << NFTNL_EXPR_FWD_SREG_ADDR);
118 if (tb[NFTA_FWD_NFPROTO]) {
119 fwd->nfproto = ntohl(mnl_attr_get_u32(tb[NFTA_FWD_NFPROTO]));
120 e->flags |= (1 << NFTNL_EXPR_FWD_NFPROTO);
126 static int nftnl_expr_fwd_snprintf(
char *buf,
size_t remain,
127 uint32_t flags,
const struct nftnl_expr *e)
132 if (e->flags & (1 << NFTNL_EXPR_FWD_SREG_DEV)) {
133 ret = snprintf(buf + offset, remain,
"sreg_dev %u ",
135 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
137 if (e->flags & (1 << NFTNL_EXPR_FWD_SREG_ADDR)) {
138 ret = snprintf(buf + offset, remain,
"sreg_addr %u ",
140 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
142 if (e->flags & (1 << NFTNL_EXPR_FWD_NFPROTO)) {
143 ret = snprintf(buf + offset, remain,
"nfproto %u ",
145 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
151 static struct attr_policy fwd_attr_policy[__NFTNL_EXPR_FWD_MAX] = {
152 [NFTNL_EXPR_FWD_SREG_DEV] = { .maxlen =
sizeof(uint32_t) },
153 [NFTNL_EXPR_FWD_SREG_ADDR] = { .maxlen =
sizeof(uint32_t) },
154 [NFTNL_EXPR_FWD_NFPROTO] = { .maxlen =
sizeof(uint32_t) },
157 struct expr_ops expr_ops_fwd = {
160 .nftnl_max_attr = __NFTNL_EXPR_FWD_MAX - 1,
161 .attr_policy = fwd_attr_policy,
162 .set = nftnl_expr_fwd_set,
163 .get = nftnl_expr_fwd_get,
164 .parse = nftnl_expr_fwd_parse,
165 .build = nftnl_expr_fwd_build,
166 .output = nftnl_expr_fwd_snprintf,