1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
|
#include <stdio.h>
#include <stdint.h>
#include <arpa/inet.h>
#include <errno.h>
#include <inttypes.h>
#include <linux/netfilter/nf_tables.h>
#include "internal.h"
#include <libmnl/libmnl.h>
#include <libnftnl/object.h>
#include "obj.h"
static int nftnl_obj_synproxy_set(struct nftnl_obj *e, uint16_t type,
const void *data, uint32_t data_len)
{
struct nftnl_obj_synproxy *synproxy = nftnl_obj_data(e);
switch (type) {
case NFTNL_OBJ_SYNPROXY_MSS:
synproxy->mss = *((uint16_t *)data);
break;
case NFTNL_OBJ_SYNPROXY_WSCALE:
synproxy->wscale = *((uint8_t *)data);
break;
case NFTNL_OBJ_SYNPROXY_FLAGS:
synproxy->flags = *((uint32_t *)data);
break;
default:
return -1;
}
return 0;
}
static const void *nftnl_obj_synproxy_get(const struct nftnl_obj *e,
uint16_t type, uint32_t *data_len)
{
struct nftnl_obj_synproxy *synproxy = nftnl_obj_data(e);
switch (type) {
case NFTNL_OBJ_SYNPROXY_MSS:
*data_len = sizeof(synproxy->mss);
return &synproxy->mss;
case NFTNL_OBJ_SYNPROXY_WSCALE:
*data_len = sizeof(synproxy->wscale);
return &synproxy->wscale;
case NFTNL_OBJ_SYNPROXY_FLAGS:
*data_len = sizeof(synproxy->flags);
return &synproxy->flags;
}
return NULL;
}
static int nftnl_obj_synproxy_cb(const struct nlattr *attr, void *data)
{
int type = mnl_attr_get_type(attr);
const struct nlattr **tb = data;
if (mnl_attr_type_valid(attr, NFTA_SYNPROXY_MAX) < 0)
return MNL_CB_OK;
switch (type) {
case NFTA_SYNPROXY_MSS:
if (mnl_attr_validate(attr, MNL_TYPE_U16) < 0)
abi_breakage();
break;
case NFTA_SYNPROXY_WSCALE:
if (mnl_attr_validate(attr, MNL_TYPE_U8) < 0)
abi_breakage();
break;
case NFTA_SYNPROXY_FLAGS:
if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
abi_breakage();
break;
}
tb[type] = attr;
return MNL_CB_OK;
}
static void nftnl_obj_synproxy_build(struct nlmsghdr *nlh,
const struct nftnl_obj *e)
{
struct nftnl_obj_synproxy *synproxy = nftnl_obj_data(e);
if (e->flags & (1 << NFTNL_OBJ_SYNPROXY_MSS))
mnl_attr_put_u16(nlh, NFTA_SYNPROXY_MSS, htons(synproxy->mss));
if (e->flags & (1 << NFTNL_OBJ_SYNPROXY_WSCALE))
mnl_attr_put_u8(nlh, NFTA_SYNPROXY_WSCALE, synproxy->wscale);
if (e->flags & (1 << NFTNL_OBJ_SYNPROXY_FLAGS))
mnl_attr_put_u32(nlh, NFTA_SYNPROXY_FLAGS,
htonl(synproxy->flags));
}
static int nftnl_obj_synproxy_parse(struct nftnl_obj *e, struct nlattr *attr)
{
struct nftnl_obj_synproxy *synproxy = nftnl_obj_data(e);
struct nlattr *tb[NFTA_SYNPROXY_MAX + 1] = {};
if (mnl_attr_parse_nested(attr, nftnl_obj_synproxy_cb, tb) < 0)
return -1;
if (tb[NFTA_SYNPROXY_MSS]) {
synproxy->mss = ntohs(mnl_attr_get_u16(tb[NFTA_SYNPROXY_MSS]));
e->flags |= (1 << NFTNL_OBJ_SYNPROXY_MSS);
}
if (tb[NFTA_SYNPROXY_WSCALE]) {
synproxy->wscale = mnl_attr_get_u8(tb[NFTA_SYNPROXY_WSCALE]);
e->flags |= (1 << NFTNL_OBJ_SYNPROXY_WSCALE);
}
if (tb[NFTA_SYNPROXY_FLAGS]) {
synproxy->flags = ntohl(mnl_attr_get_u32(tb[NFTA_SYNPROXY_FLAGS]));
e->flags |= (1 << NFTNL_OBJ_SYNPROXY_FLAGS);
}
return 0;
}
static int nftnl_obj_synproxy_snprintf(char *buf, size_t len,
uint32_t flags,
const struct nftnl_obj *e)
{
struct nftnl_obj_synproxy *synproxy = nftnl_obj_data(e);
int ret, offset = 0;
if (e->flags & (1 << NFTNL_OBJ_SYNPROXY_MSS) &&
e->flags & (1 << NFTNL_OBJ_SYNPROXY_WSCALE)) {
ret = snprintf(buf, len, "mss %u wscale %u ", synproxy->mss,
synproxy->wscale);
SNPRINTF_BUFFER_SIZE(ret, len, offset);
}
return offset;
}
struct obj_ops obj_ops_synproxy = {
.name = "synproxy",
.type = NFT_OBJECT_SYNPROXY,
.alloc_len = sizeof(struct nftnl_obj_synproxy),
.max_attr = NFTA_SYNPROXY_MAX,
.set = nftnl_obj_synproxy_set,
.get = nftnl_obj_synproxy_get,
.parse = nftnl_obj_synproxy_parse,
.build = nftnl_obj_synproxy_build,
.output = nftnl_obj_synproxy_snprintf,
};
|
