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
|
#ifndef _NF_CONNTRACK_SYNPROXY_H
#define _NF_CONNTRACK_SYNPROXY_H
#include <net/netns/generic.h>
struct nf_conn_synproxy {
u32 isn;
u32 its;
u32 tsoff;
};
static inline struct nf_conn_synproxy *nfct_synproxy(const struct nf_conn *ct)
{
#if IS_ENABLED(CONFIG_NETFILTER_SYNPROXY)
return nf_ct_ext_find(ct, NF_CT_EXT_SYNPROXY);
#else
return NULL;
#endif
}
static inline struct nf_conn_synproxy *nfct_synproxy_ext_add(struct nf_conn *ct)
{
#if IS_ENABLED(CONFIG_NETFILTER_SYNPROXY)
return nf_ct_ext_add(ct, NF_CT_EXT_SYNPROXY, GFP_ATOMIC);
#else
return NULL;
#endif
}
struct synproxy_stats {
unsigned int syn_received;
unsigned int cookie_invalid;
unsigned int cookie_valid;
unsigned int cookie_retrans;
unsigned int conn_reopened;
};
struct synproxy_net {
struct nf_conn *tmpl;
struct synproxy_stats __percpu *stats;
};
extern int synproxy_net_id;
static inline struct synproxy_net *synproxy_pernet(struct net *net)
{
return net_generic(net, synproxy_net_id);
}
struct synproxy_options {
u8 options;
u8 wscale;
u16 mss;
u32 tsval;
u32 tsecr;
};
struct tcphdr;
struct xt_synproxy_info;
extern void synproxy_parse_options(const struct sk_buff *skb, unsigned int doff,
const struct tcphdr *th,
struct synproxy_options *opts);
extern unsigned int synproxy_options_size(const struct synproxy_options *opts);
extern void synproxy_build_options(struct tcphdr *th,
const struct synproxy_options *opts);
extern void synproxy_init_timestamp_cookie(const struct xt_synproxy_info *info,
struct synproxy_options *opts);
extern void synproxy_check_timestamp_cookie(struct synproxy_options *opts);
extern unsigned int synproxy_tstamp_adjust(struct sk_buff *skb,
unsigned int protoff,
struct tcphdr *th,
struct nf_conn *ct,
enum ip_conntrack_info ctinfo,
const struct nf_conn_synproxy *synproxy);
#endif /* _NF_CONNTRACK_SYNPROXY_H */
|
