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,
sizeof(fwd->sreg_dev));
38 case NFTNL_EXPR_FWD_SREG_ADDR:
39 memcpy(&fwd->sreg_addr, data,
sizeof(fwd->sreg_addr));
41 case NFTNL_EXPR_FWD_NFPROTO:
42 memcpy(&fwd->nfproto, data,
sizeof(fwd->nfproto));
50 static const void *nftnl_expr_fwd_get(
const struct nftnl_expr *e,
51 uint16_t type, uint32_t *data_len)
56 case NFTNL_EXPR_FWD_SREG_DEV:
57 *data_len =
sizeof(fwd->sreg_dev);
58 return &fwd->sreg_dev;
59 case NFTNL_EXPR_FWD_SREG_ADDR:
60 *data_len =
sizeof(fwd->sreg_addr);
61 return &fwd->sreg_addr;
62 case NFTNL_EXPR_FWD_NFPROTO:
63 *data_len =
sizeof(fwd->nfproto);
69 static int nftnl_expr_fwd_cb(
const struct nlattr *attr,
void *data)
71 const struct nlattr **tb = data;
72 int type = mnl_attr_get_type(attr);
74 if (mnl_attr_type_valid(attr, NFTA_FWD_MAX) < 0)
78 case NFTA_FWD_SREG_DEV:
79 case NFTA_FWD_SREG_ADDR:
80 case NFTA_FWD_NFPROTO:
81 if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
90 static void nftnl_expr_fwd_build(
struct nlmsghdr *nlh,
91 const struct nftnl_expr *e)
95 if (e->flags & (1 << NFTNL_EXPR_FWD_SREG_DEV))
96 mnl_attr_put_u32(nlh, NFTA_FWD_SREG_DEV, htonl(fwd->sreg_dev));
97 if (e->flags & (1 << NFTNL_EXPR_FWD_SREG_ADDR))
98 mnl_attr_put_u32(nlh, NFTA_FWD_SREG_ADDR, htonl(fwd->sreg_addr));
99 if (e->flags & (1 << NFTNL_EXPR_FWD_NFPROTO))
100 mnl_attr_put_u32(nlh, NFTA_FWD_NFPROTO, htonl(fwd->nfproto));
103 static int nftnl_expr_fwd_parse(
struct nftnl_expr *e,
struct nlattr *attr)
106 struct nlattr *tb[NFTA_FWD_MAX + 1] = {};
109 if (mnl_attr_parse_nested(attr, nftnl_expr_fwd_cb, tb) < 0)
112 if (tb[NFTA_FWD_SREG_DEV]) {
113 fwd->sreg_dev = ntohl(mnl_attr_get_u32(tb[NFTA_FWD_SREG_DEV]));
114 e->flags |= (1 << NFTNL_EXPR_FWD_SREG_DEV);
116 if (tb[NFTA_FWD_SREG_ADDR]) {
117 fwd->sreg_addr = ntohl(mnl_attr_get_u32(tb[NFTA_FWD_SREG_ADDR]));
118 e->flags |= (1 << NFTNL_EXPR_FWD_SREG_ADDR);
120 if (tb[NFTA_FWD_NFPROTO]) {
121 fwd->nfproto = ntohl(mnl_attr_get_u32(tb[NFTA_FWD_NFPROTO]));
122 e->flags |= (1 << NFTNL_EXPR_FWD_NFPROTO);
128 static int nftnl_expr_fwd_snprintf_default(
char *buf,
size_t len,
129 const struct nftnl_expr *e,
132 int remain = len, offset = 0, ret;
135 if (e->flags & (1 << NFTNL_EXPR_FWD_SREG_DEV)) {
136 ret = snprintf(buf + offset, remain,
"sreg_dev %u ",
138 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
140 if (e->flags & (1 << NFTNL_EXPR_FWD_SREG_ADDR)) {
141 ret = snprintf(buf + offset, remain,
"sreg_addr %u ",
143 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
145 if (e->flags & (1 << NFTNL_EXPR_FWD_NFPROTO)) {
146 ret = snprintf(buf + offset, remain,
"nfproto %u ",
148 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
154 static int nftnl_expr_fwd_snprintf(
char *buf,
size_t len, uint32_t type,
155 uint32_t flags,
const struct nftnl_expr *e)
158 case NFTNL_OUTPUT_DEFAULT:
159 return nftnl_expr_fwd_snprintf_default(buf, len, e, flags);
160 case NFTNL_OUTPUT_XML:
161 case NFTNL_OUTPUT_JSON:
168 struct expr_ops expr_ops_fwd = {
171 .max_attr = NFTA_FWD_MAX,
172 .set = nftnl_expr_fwd_set,
173 .get = nftnl_expr_fwd_get,
174 .parse = nftnl_expr_fwd_parse,
175 .build = nftnl_expr_fwd_build,
176 .snprintf = nftnl_expr_fwd_snprintf,