6 #include <linux/netfilter/nf_tables.h>
9 #include <libmnl/libmnl.h>
10 #include <libnftnl/expr.h>
11 #include <libnftnl/rule.h>
13 #define OSF_GENRE_SIZE 32
16 enum nft_registers dreg;
21 static int nftnl_expr_osf_set(
struct nftnl_expr *e, uint16_t type,
22 const void *data, uint32_t data_len)
27 case NFTNL_EXPR_OSF_DREG:
28 memcpy(&osf->dreg, data, data_len);
30 case NFTNL_EXPR_OSF_TTL:
31 memcpy(&osf->ttl, data, data_len);
33 case NFTNL_EXPR_OSF_FLAGS:
34 memcpy(&osf->flags, data, data_len);
41 nftnl_expr_osf_get(
const struct nftnl_expr *e, uint16_t type,
47 case NFTNL_EXPR_OSF_DREG:
48 *data_len =
sizeof(osf->dreg);
50 case NFTNL_EXPR_OSF_TTL:
51 *data_len =
sizeof(osf->ttl);
53 case NFTNL_EXPR_OSF_FLAGS:
54 *data_len =
sizeof(osf->flags);
60 static int nftnl_expr_osf_cb(
const struct nlattr *attr,
void *data)
62 const struct nlattr **tb = data;
63 int type = mnl_attr_get_type(attr);
65 if (mnl_attr_type_valid(attr, NFTA_OSF_MAX) < 0)
69 case NFTNL_EXPR_OSF_DREG:
70 case NFTNL_EXPR_OSF_FLAGS:
71 if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
75 case NFTNL_EXPR_OSF_TTL:
76 if (mnl_attr_validate(attr, MNL_TYPE_U8) < 0)
87 nftnl_expr_osf_build(
struct nlmsghdr *nlh,
const struct nftnl_expr *e)
91 if (e->flags & (1 << NFTNL_EXPR_OSF_DREG))
92 mnl_attr_put_u32(nlh, NFTA_OSF_DREG, htonl(osf->dreg));
93 if (e->flags & (1 << NFTNL_EXPR_OSF_TTL))
94 mnl_attr_put_u8(nlh, NFTA_OSF_TTL, osf->ttl);
95 if (e->flags & (1 << NFTNL_EXPR_OSF_FLAGS))
97 mnl_attr_put_u32(nlh, NFTA_OSF_FLAGS, htonl(osf->flags));
101 nftnl_expr_osf_parse(
struct nftnl_expr *e,
struct nlattr *attr)
104 struct nlattr *tb[NFTA_OSF_MAX + 1] = {};
106 if (mnl_attr_parse_nested(attr, nftnl_expr_osf_cb, tb) < 0)
109 if (tb[NFTA_OSF_DREG]) {
110 osf->dreg = ntohl(mnl_attr_get_u32(tb[NFTA_OSF_DREG]));
111 e->flags |= (1 << NFTNL_EXPR_OSF_DREG);
114 if (tb[NFTA_OSF_TTL]) {
115 osf->ttl = mnl_attr_get_u8(tb[NFTA_OSF_TTL]);
116 e->flags |= (1 << NFTNL_EXPR_OSF_TTL);
119 if (tb[NFTA_OSF_FLAGS]) {
120 osf->flags = ntohl(mnl_attr_get_u32(tb[NFTA_OSF_FLAGS]));
121 e->flags |= (1 << NFTNL_EXPR_OSF_FLAGS);
128 nftnl_expr_osf_snprintf(
char *buf,
size_t len,
129 uint32_t flags,
const struct nftnl_expr *e)
134 if (e->flags & (1 << NFTNL_EXPR_OSF_DREG)) {
135 ret = snprintf(buf, len,
"dreg %u ", osf->dreg);
136 SNPRINTF_BUFFER_SIZE(ret, len, offset);
142 static struct attr_policy osf_attr_policy[__NFTNL_EXPR_OSF_MAX] = {
143 [NFTNL_EXPR_OSF_DREG] = { .maxlen =
sizeof(uint32_t) },
144 [NFTNL_EXPR_OSF_TTL] = { .maxlen =
sizeof(uint8_t) },
145 [NFTNL_EXPR_OSF_FLAGS] = { .maxlen =
sizeof(uint32_t) },
148 struct expr_ops expr_ops_osf = {
151 .nftnl_max_attr = __NFTNL_EXPR_OSF_MAX - 1,
152 .attr_policy = osf_attr_policy,
153 .set = nftnl_expr_osf_set,
154 .get = nftnl_expr_osf_get,
155 .parse = nftnl_expr_osf_parse,
156 .build = nftnl_expr_osf_build,
157 .output = nftnl_expr_osf_snprintf,