12#include <libmnl/libmnl.h>
13#include <linux/netfilter/nf_tables.h>
14#include <libnftnl/expr.h>
15#include <libnftnl/rule.h>
20 enum nft_registers sreg_dev;
21 enum nft_registers sreg_addr;
25static int nftnl_expr_fwd_set(
struct nftnl_expr *e, uint16_t type,
26 const void *data, uint32_t data_len)
31 case NFTNL_EXPR_FWD_SREG_DEV:
32 memcpy(&fwd->sreg_dev, data, data_len);
34 case NFTNL_EXPR_FWD_SREG_ADDR:
35 memcpy(&fwd->sreg_addr, data, data_len);
37 case NFTNL_EXPR_FWD_NFPROTO:
38 memcpy(&fwd->nfproto, data, data_len);
44static const void *nftnl_expr_fwd_get(
const struct nftnl_expr *e,
45 uint16_t type, uint32_t *data_len)
50 case NFTNL_EXPR_FWD_SREG_DEV:
51 *data_len =
sizeof(fwd->sreg_dev);
52 return &fwd->sreg_dev;
53 case NFTNL_EXPR_FWD_SREG_ADDR:
54 *data_len =
sizeof(fwd->sreg_addr);
55 return &fwd->sreg_addr;
56 case NFTNL_EXPR_FWD_NFPROTO:
57 *data_len =
sizeof(fwd->nfproto);
63static int nftnl_expr_fwd_cb(
const struct nlattr *attr,
void *data)
65 const struct nlattr **tb = data;
66 int type = mnl_attr_get_type(attr);
68 if (mnl_attr_type_valid(attr, NFTA_FWD_MAX) < 0)
72 case NFTA_FWD_SREG_DEV:
73 case NFTA_FWD_SREG_ADDR:
74 case NFTA_FWD_NFPROTO:
75 if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
84static void nftnl_expr_fwd_build(
struct nlmsghdr *nlh,
85 const struct nftnl_expr *e)
89 if (e->flags & (1 << NFTNL_EXPR_FWD_SREG_DEV))
90 mnl_attr_put_u32(nlh, NFTA_FWD_SREG_DEV, htonl(fwd->sreg_dev));
91 if (e->flags & (1 << NFTNL_EXPR_FWD_SREG_ADDR))
92 mnl_attr_put_u32(nlh, NFTA_FWD_SREG_ADDR, htonl(fwd->sreg_addr));
93 if (e->flags & (1 << NFTNL_EXPR_FWD_NFPROTO))
94 mnl_attr_put_u32(nlh, NFTA_FWD_NFPROTO, htonl(fwd->nfproto));
97static int nftnl_expr_fwd_parse(
struct nftnl_expr *e,
struct nlattr *attr)
100 struct nlattr *tb[NFTA_FWD_MAX + 1] = {};
103 if (mnl_attr_parse_nested(attr, nftnl_expr_fwd_cb, tb) < 0)
106 if (tb[NFTA_FWD_SREG_DEV]) {
107 fwd->sreg_dev = ntohl(mnl_attr_get_u32(tb[NFTA_FWD_SREG_DEV]));
108 e->flags |= (1 << NFTNL_EXPR_FWD_SREG_DEV);
110 if (tb[NFTA_FWD_SREG_ADDR]) {
111 fwd->sreg_addr = ntohl(mnl_attr_get_u32(tb[NFTA_FWD_SREG_ADDR]));
112 e->flags |= (1 << NFTNL_EXPR_FWD_SREG_ADDR);
114 if (tb[NFTA_FWD_NFPROTO]) {
115 fwd->nfproto = ntohl(mnl_attr_get_u32(tb[NFTA_FWD_NFPROTO]));
116 e->flags |= (1 << NFTNL_EXPR_FWD_NFPROTO);
122static int nftnl_expr_fwd_snprintf(
char *buf,
size_t remain,
123 uint32_t flags,
const struct nftnl_expr *e)
128 if (e->flags & (1 << NFTNL_EXPR_FWD_SREG_DEV)) {
129 ret = snprintf(buf + offset, remain,
"sreg_dev %u ",
131 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
133 if (e->flags & (1 << NFTNL_EXPR_FWD_SREG_ADDR)) {
134 ret = snprintf(buf + offset, remain,
"sreg_addr %u ",
136 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
138 if (e->flags & (1 << NFTNL_EXPR_FWD_NFPROTO)) {
139 ret = snprintf(buf + offset, remain,
"nfproto %u ",
141 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
147static struct attr_policy fwd_attr_policy[__NFTNL_EXPR_FWD_MAX] = {
148 [NFTNL_EXPR_FWD_SREG_DEV] = { .maxlen =
sizeof(uint32_t) },
149 [NFTNL_EXPR_FWD_SREG_ADDR] = { .maxlen =
sizeof(uint32_t) },
150 [NFTNL_EXPR_FWD_NFPROTO] = { .maxlen =
sizeof(uint32_t) },
153struct expr_ops expr_ops_fwd = {
156 .nftnl_max_attr = __NFTNL_EXPR_FWD_MAX - 1,
157 .attr_policy = fwd_attr_policy,
158 .set = nftnl_expr_fwd_set,
159 .get = nftnl_expr_fwd_get,
160 .parse = nftnl_expr_fwd_parse,
161 .build = nftnl_expr_fwd_build,
162 .output = nftnl_expr_fwd_snprintf,