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;
21static 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,
sizeof(osf->dreg));
30 case NFTNL_EXPR_OSF_TTL:
31 memcpy(&osf->ttl, data,
sizeof(osf->ttl));
33 case NFTNL_EXPR_OSF_FLAGS:
34 memcpy(&osf->flags, data,
sizeof(osf->flags));
41nftnl_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);
60static 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)
87nftnl_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, NFTNL_EXPR_OSF_DREG, htonl(osf->dreg));
93 if (e->flags & (1 << NFTNL_EXPR_OSF_TTL))
94 mnl_attr_put_u8(nlh, NFTNL_EXPR_OSF_TTL, osf->ttl);
95 if (e->flags & (1 << NFTNL_EXPR_OSF_FLAGS))
97 mnl_attr_put_u32(nlh, NFTNL_EXPR_OSF_FLAGS, htonl(osf->flags));
101nftnl_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);
128nftnl_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);
142struct expr_ops expr_ops_osf = {
145 .max_attr = NFTA_OSF_MAX,
146 .set = nftnl_expr_osf_set,
147 .get = nftnl_expr_osf_get,
148 .parse = nftnl_expr_osf_parse,
149 .build = nftnl_expr_osf_build,
150 .output = nftnl_expr_osf_snprintf,