11 #include <arpa/inet.h>
13 #include <linux/netfilter/nf_tables.h>
16 #include <libmnl/libmnl.h>
17 #include <libnftnl/expr.h>
18 #include <libnftnl/rule.h>
25 static int nftnl_expr_reject_set(
struct nftnl_expr *e, uint16_t type,
26 const void *data, uint32_t data_len)
31 case NFTNL_EXPR_REJECT_TYPE:
32 memcpy(&reject->type, data, data_len);
34 case NFTNL_EXPR_REJECT_CODE:
35 memcpy(&reject->icmp_code, data, data_len);
42 nftnl_expr_reject_get(
const struct nftnl_expr *e, uint16_t type,
48 case NFTNL_EXPR_REJECT_TYPE:
49 *data_len =
sizeof(reject->type);
51 case NFTNL_EXPR_REJECT_CODE:
52 *data_len =
sizeof(reject->icmp_code);
53 return &reject->icmp_code;
58 static int nftnl_expr_reject_cb(
const struct nlattr *attr,
void *data)
60 const struct nlattr **tb = data;
61 int type = mnl_attr_get_type(attr);
63 if (mnl_attr_type_valid(attr, NFTA_REJECT_MAX) < 0)
67 case NFTA_REJECT_TYPE:
68 if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
71 case NFTA_REJECT_ICMP_CODE:
72 if (mnl_attr_validate(attr, MNL_TYPE_U8) < 0)
82 nftnl_expr_reject_build(
struct nlmsghdr *nlh,
const struct nftnl_expr *e)
86 if (e->flags & (1 << NFTNL_EXPR_REJECT_TYPE))
87 mnl_attr_put_u32(nlh, NFTA_REJECT_TYPE, htonl(reject->type));
88 if (e->flags & (1 << NFTNL_EXPR_REJECT_CODE))
89 mnl_attr_put_u8(nlh, NFTA_REJECT_ICMP_CODE, reject->icmp_code);
93 nftnl_expr_reject_parse(
struct nftnl_expr *e,
struct nlattr *attr)
96 struct nlattr *tb[NFTA_REJECT_MAX+1] = {};
98 if (mnl_attr_parse_nested(attr, nftnl_expr_reject_cb, tb) < 0)
101 if (tb[NFTA_REJECT_TYPE]) {
102 reject->type = ntohl(mnl_attr_get_u32(tb[NFTA_REJECT_TYPE]));
103 e->flags |= (1 << NFTNL_EXPR_REJECT_TYPE);
105 if (tb[NFTA_REJECT_ICMP_CODE]) {
106 reject->icmp_code = mnl_attr_get_u8(tb[NFTA_REJECT_ICMP_CODE]);
107 e->flags |= (1 << NFTNL_EXPR_REJECT_CODE);
114 nftnl_expr_reject_snprintf(
char *buf,
size_t len,
115 uint32_t flags,
const struct nftnl_expr *e)
119 return snprintf(buf, len,
"type %u code %u ",
120 reject->type, reject->icmp_code);
123 static struct attr_policy reject_attr_policy[__NFTNL_EXPR_REJECT_MAX] = {
124 [NFTNL_EXPR_REJECT_TYPE] = { .maxlen =
sizeof(uint32_t) },
125 [NFTNL_EXPR_REJECT_CODE] = { .maxlen =
sizeof(uint8_t) },
128 struct expr_ops expr_ops_reject = {
131 .nftnl_max_attr = __NFTNL_EXPR_REJECT_MAX - 1,
132 .attr_policy = reject_attr_policy,
133 .set = nftnl_expr_reject_set,
134 .get = nftnl_expr_reject_get,
135 .parse = nftnl_expr_reject_parse,
136 .build = nftnl_expr_reject_build,
137 .output = nftnl_expr_reject_snprintf,