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>
25 enum nft_registers sreg_dev;
26 enum nft_registers sreg_addr;
30 static int nftnl_expr_fwd_set(
struct nftnl_expr *e, uint16_t type,
31 const void *data, uint32_t data_len)
36 case NFTNL_EXPR_FWD_SREG_DEV:
37 memcpy(&fwd->sreg_dev, data,
sizeof(fwd->sreg_dev));
39 case NFTNL_EXPR_FWD_SREG_ADDR:
40 memcpy(&fwd->sreg_addr, data,
sizeof(fwd->sreg_addr));
42 case NFTNL_EXPR_FWD_NFPROTO:
43 memcpy(&fwd->nfproto, data,
sizeof(fwd->nfproto));
51 static const void *nftnl_expr_fwd_get(
const struct nftnl_expr *e,
52 uint16_t type, uint32_t *data_len)
57 case NFTNL_EXPR_FWD_SREG_DEV:
58 *data_len =
sizeof(fwd->sreg_dev);
59 return &fwd->sreg_dev;
60 case NFTNL_EXPR_FWD_SREG_ADDR:
61 *data_len =
sizeof(fwd->sreg_addr);
62 return &fwd->sreg_addr;
63 case NFTNL_EXPR_FWD_NFPROTO:
64 *data_len =
sizeof(fwd->nfproto);
70 static int nftnl_expr_fwd_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_FWD_MAX) < 0)
79 case NFTA_FWD_SREG_DEV:
80 case NFTA_FWD_SREG_ADDR:
81 case NFTA_FWD_NFPROTO:
82 if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
91 static void nftnl_expr_fwd_build(
struct nlmsghdr *nlh,
92 const struct nftnl_expr *e)
96 if (e->flags & (1 << NFTNL_EXPR_FWD_SREG_DEV))
97 mnl_attr_put_u32(nlh, NFTA_FWD_SREG_DEV, htonl(fwd->sreg_dev));
98 if (e->flags & (1 << NFTNL_EXPR_FWD_SREG_ADDR))
99 mnl_attr_put_u32(nlh, NFTA_FWD_SREG_ADDR, htonl(fwd->sreg_addr));
100 if (e->flags & (1 << NFTNL_EXPR_FWD_NFPROTO))
101 mnl_attr_put_u32(nlh, NFTA_FWD_NFPROTO, htonl(fwd->nfproto));
104 static int nftnl_expr_fwd_parse(
struct nftnl_expr *e,
struct nlattr *attr)
107 struct nlattr *tb[NFTA_FWD_MAX + 1] = {};
110 if (mnl_attr_parse_nested(attr, nftnl_expr_fwd_cb, tb) < 0)
113 if (tb[NFTA_FWD_SREG_DEV]) {
114 fwd->sreg_dev = ntohl(mnl_attr_get_u32(tb[NFTA_FWD_SREG_DEV]));
115 e->flags |= (1 << NFTNL_EXPR_FWD_SREG_DEV);
117 if (tb[NFTA_FWD_SREG_ADDR]) {
118 fwd->sreg_addr = ntohl(mnl_attr_get_u32(tb[NFTA_FWD_SREG_ADDR]));
119 e->flags |= (1 << NFTNL_EXPR_FWD_SREG_ADDR);
121 if (tb[NFTA_FWD_NFPROTO]) {
122 fwd->nfproto = ntohl(mnl_attr_get_u32(tb[NFTA_FWD_NFPROTO]));
123 e->flags |= (1 << NFTNL_EXPR_FWD_NFPROTO);
129 static int nftnl_expr_fwd_snprintf_default(
char *buf,
size_t len,
130 const struct nftnl_expr *e,
133 int remain = len, offset = 0, ret;
136 if (e->flags & (1 << NFTNL_EXPR_FWD_SREG_DEV)) {
137 ret = snprintf(buf + offset, remain,
"sreg_dev %u ",
139 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
141 if (e->flags & (1 << NFTNL_EXPR_FWD_SREG_ADDR)) {
142 ret = snprintf(buf + offset, remain,
"sreg_addr %u ",
144 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
146 if (e->flags & (1 << NFTNL_EXPR_FWD_NFPROTO)) {
147 ret = snprintf(buf + offset, remain,
"nfproto %u ",
149 SNPRINTF_BUFFER_SIZE(ret, remain, offset);
155 static int nftnl_expr_fwd_snprintf(
char *buf,
size_t len, uint32_t type,
156 uint32_t flags,
const struct nftnl_expr *e)
159 case NFTNL_OUTPUT_DEFAULT:
160 return nftnl_expr_fwd_snprintf_default(buf, len, e, flags);
161 case NFTNL_OUTPUT_XML:
162 case NFTNL_OUTPUT_JSON:
169 struct expr_ops expr_ops_fwd = {
172 .max_attr = NFTA_FWD_MAX,
173 .set = nftnl_expr_fwd_set,
174 .get = nftnl_expr_fwd_get,
175 .parse = nftnl_expr_fwd_parse,
176 .build = nftnl_expr_fwd_build,
177 .snprintf = nftnl_expr_fwd_snprintf,