7 #include <linux/netfilter/nf_tables.h>
10 #include <libmnl/libmnl.h>
11 #include <libnftnl/object.h>
15 static int nftnl_obj_synproxy_set(
struct nftnl_obj *e, uint16_t type,
16 const void *data, uint32_t data_len)
18 struct nftnl_obj_synproxy *synproxy = nftnl_obj_data(e);
21 case NFTNL_OBJ_SYNPROXY_MSS:
22 memcpy(&synproxy->mss, data, data_len);
24 case NFTNL_OBJ_SYNPROXY_WSCALE:
25 memcpy(&synproxy->wscale, data, data_len);
27 case NFTNL_OBJ_SYNPROXY_FLAGS:
28 memcpy(&synproxy->flags, data, data_len);
34 static const void *nftnl_obj_synproxy_get(
const struct nftnl_obj *e,
35 uint16_t type, uint32_t *data_len)
37 struct nftnl_obj_synproxy *synproxy = nftnl_obj_data(e);
40 case NFTNL_OBJ_SYNPROXY_MSS:
41 *data_len =
sizeof(synproxy->mss);
42 return &synproxy->mss;
43 case NFTNL_OBJ_SYNPROXY_WSCALE:
44 *data_len =
sizeof(synproxy->wscale);
45 return &synproxy->wscale;
46 case NFTNL_OBJ_SYNPROXY_FLAGS:
47 *data_len =
sizeof(synproxy->flags);
48 return &synproxy->flags;
53 static int nftnl_obj_synproxy_cb(
const struct nlattr *attr,
void *data)
55 int type = mnl_attr_get_type(attr);
56 const struct nlattr **tb = data;
58 if (mnl_attr_type_valid(attr, NFTA_SYNPROXY_MAX) < 0)
62 case NFTA_SYNPROXY_MSS:
63 if (mnl_attr_validate(attr, MNL_TYPE_U16) < 0)
66 case NFTA_SYNPROXY_WSCALE:
67 if (mnl_attr_validate(attr, MNL_TYPE_U8) < 0)
70 case NFTA_SYNPROXY_FLAGS:
71 if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
80 static void nftnl_obj_synproxy_build(
struct nlmsghdr *nlh,
81 const struct nftnl_obj *e)
83 struct nftnl_obj_synproxy *synproxy = nftnl_obj_data(e);
85 if (e->flags & (1 << NFTNL_OBJ_SYNPROXY_MSS))
86 mnl_attr_put_u16(nlh, NFTA_SYNPROXY_MSS, htons(synproxy->mss));
87 if (e->flags & (1 << NFTNL_OBJ_SYNPROXY_WSCALE))
88 mnl_attr_put_u8(nlh, NFTA_SYNPROXY_WSCALE, synproxy->wscale);
89 if (e->flags & (1 << NFTNL_OBJ_SYNPROXY_FLAGS))
90 mnl_attr_put_u32(nlh, NFTA_SYNPROXY_FLAGS,
91 htonl(synproxy->flags));
94 static int nftnl_obj_synproxy_parse(
struct nftnl_obj *e,
struct nlattr *attr)
96 struct nftnl_obj_synproxy *synproxy = nftnl_obj_data(e);
97 struct nlattr *tb[NFTA_SYNPROXY_MAX + 1] = {};
99 if (mnl_attr_parse_nested(attr, nftnl_obj_synproxy_cb, tb) < 0)
102 if (tb[NFTA_SYNPROXY_MSS]) {
103 synproxy->mss = ntohs(mnl_attr_get_u16(tb[NFTA_SYNPROXY_MSS]));
104 e->flags |= (1 << NFTNL_OBJ_SYNPROXY_MSS);
106 if (tb[NFTA_SYNPROXY_WSCALE]) {
107 synproxy->wscale = mnl_attr_get_u8(tb[NFTA_SYNPROXY_WSCALE]);
108 e->flags |= (1 << NFTNL_OBJ_SYNPROXY_WSCALE);
110 if (tb[NFTA_SYNPROXY_FLAGS]) {
111 synproxy->flags = ntohl(mnl_attr_get_u32(tb[NFTA_SYNPROXY_FLAGS]));
112 e->flags |= (1 << NFTNL_OBJ_SYNPROXY_FLAGS);
118 static int nftnl_obj_synproxy_snprintf(
char *buf,
size_t len,
120 const struct nftnl_obj *e)
122 struct nftnl_obj_synproxy *synproxy = nftnl_obj_data(e);
125 if (e->flags & (1 << NFTNL_OBJ_SYNPROXY_MSS) &&
126 e->flags & (1 << NFTNL_OBJ_SYNPROXY_WSCALE)) {
127 ret = snprintf(buf, len,
"mss %u wscale %u ", synproxy->mss,
129 SNPRINTF_BUFFER_SIZE(ret, len, offset);
135 static struct attr_policy obj_synproxy_attr_policy[__NFTNL_OBJ_SYNPROXY_MAX] = {
136 [NFTNL_OBJ_SYNPROXY_MSS] = { .maxlen =
sizeof(uint16_t) },
137 [NFTNL_OBJ_SYNPROXY_WSCALE] = { .maxlen =
sizeof(uint8_t) },
138 [NFTNL_OBJ_SYNPROXY_FLAGS] = { .maxlen =
sizeof(uint32_t) },
141 struct obj_ops obj_ops_synproxy = {
143 .type = NFT_OBJECT_SYNPROXY,
144 .alloc_len =
sizeof(
struct nftnl_obj_synproxy),
145 .nftnl_max_attr = __NFTNL_OBJ_SYNPROXY_MAX - 1,
146 .attr_policy = obj_synproxy_attr_policy,
147 .set = nftnl_obj_synproxy_set,
148 .get = nftnl_obj_synproxy_get,
149 .parse = nftnl_obj_synproxy_parse,
150 .build = nftnl_obj_synproxy_build,
151 .output = nftnl_obj_synproxy_snprintf,