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;
29static 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));
50static 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);
69static 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)
90static 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));
103static 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);
128static int nftnl_expr_fwd_snprintf(
char *buf,
size_t remain,
129 uint32_t flags,
const struct nftnl_expr *e)
134 if (e->flags & (1 << NFTNL_EXPR_FWD_SREG_DEV)) {
135 ret = snprintf(buf + offset, remain,
"sreg_dev %u ",
137 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
139 if (e->flags & (1 << NFTNL_EXPR_FWD_SREG_ADDR)) {
140 ret = snprintf(buf + offset, remain,
"sreg_addr %u ",
142 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
144 if (e->flags & (1 << NFTNL_EXPR_FWD_NFPROTO)) {
145 ret = snprintf(buf + offset, remain,
"nfproto %u ",
147 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
153struct expr_ops expr_ops_fwd = {
156 .max_attr = NFTA_FWD_MAX,
157 .set = nftnl_expr_fwd_set,
158 .get = nftnl_expr_fwd_get,
159 .parse = nftnl_expr_fwd_parse,
160 .build = nftnl_expr_fwd_build,
161 .output = nftnl_expr_fwd_snprintf,