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
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
|
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Header for use in defining a given L4 protocol for connection tracking.
*
* 16 Dec 2003: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
* - generalized L3 protocol dependent part.
*
* Derived from include/linux/netfiter_ipv4/ip_conntrack_protcol.h
*/
#ifndef _NF_CONNTRACK_L4PROTO_H
#define _NF_CONNTRACK_L4PROTO_H
#include <linux/netlink.h>
#include <net/netlink.h>
#include <net/netfilter/nf_conntrack.h>
#include <net/netns/generic.h>
struct seq_file;
struct nf_conntrack_l4proto {
/* L4 Protocol number. */
u_int8_t l4proto;
/* Resolve clashes on insertion races. */
bool allow_clash;
/* protoinfo nlattr size, closes a hole */
u16 nlattr_size;
/* called by gc worker if table is full */
bool (*can_early_drop)(const struct nf_conn *ct);
/* convert protoinfo to nfnetink attributes */
int (*to_nlattr)(struct sk_buff *skb, struct nlattr *nla,
struct nf_conn *ct);
/* convert nfnetlink attributes to protoinfo */
int (*from_nlattr)(struct nlattr *tb[], struct nf_conn *ct);
int (*tuple_to_nlattr)(struct sk_buff *skb,
const struct nf_conntrack_tuple *t);
/* Calculate tuple nlattr size */
unsigned int (*nlattr_tuple_size)(void);
int (*nlattr_to_tuple)(struct nlattr *tb[],
struct nf_conntrack_tuple *t,
u_int32_t flags);
const struct nla_policy *nla_policy;
struct {
int (*nlattr_to_obj)(struct nlattr *tb[],
struct net *net, void *data);
int (*obj_to_nlattr)(struct sk_buff *skb, const void *data);
u16 obj_size;
u16 nlattr_max;
const struct nla_policy *nla_policy;
} ctnl_timeout;
#ifdef CONFIG_NF_CONNTRACK_PROCFS
/* Print out the private part of the conntrack. */
void (*print_conntrack)(struct seq_file *s, struct nf_conn *);
#endif
};
bool icmp_pkt_to_tuple(const struct sk_buff *skb,
unsigned int dataoff,
struct net *net,
struct nf_conntrack_tuple *tuple);
bool icmpv6_pkt_to_tuple(const struct sk_buff *skb,
unsigned int dataoff,
struct net *net,
struct nf_conntrack_tuple *tuple);
bool nf_conntrack_invert_icmp_tuple(struct nf_conntrack_tuple *tuple,
const struct nf_conntrack_tuple *orig);
bool nf_conntrack_invert_icmpv6_tuple(struct nf_conntrack_tuple *tuple,
const struct nf_conntrack_tuple *orig);
int nf_conntrack_inet_error(struct nf_conn *tmpl, struct sk_buff *skb,
unsigned int dataoff,
const struct nf_hook_state *state,
u8 l4proto,
union nf_inet_addr *outer_daddr);
int nf_conntrack_icmpv4_error(struct nf_conn *tmpl,
struct sk_buff *skb,
unsigned int dataoff,
const struct nf_hook_state *state);
int nf_conntrack_icmpv6_error(struct nf_conn *tmpl,
struct sk_buff *skb,
unsigned int dataoff,
const struct nf_hook_state *state);
int nf_conntrack_icmp_packet(struct nf_conn *ct,
struct sk_buff *skb,
enum ip_conntrack_info ctinfo,
const struct nf_hook_state *state);
int nf_conntrack_icmpv6_packet(struct nf_conn *ct,
struct sk_buff *skb,
enum ip_conntrack_info ctinfo,
const struct nf_hook_state *state);
int nf_conntrack_udp_packet(struct nf_conn *ct,
struct sk_buff *skb,
unsigned int dataoff,
enum ip_conntrack_info ctinfo,
const struct nf_hook_state *state);
int nf_conntrack_udplite_packet(struct nf_conn *ct,
struct sk_buff *skb,
unsigned int dataoff,
enum ip_conntrack_info ctinfo,
const struct nf_hook_state *state);
int nf_conntrack_tcp_packet(struct nf_conn *ct,
struct sk_buff *skb,
unsigned int dataoff,
enum ip_conntrack_info ctinfo,
const struct nf_hook_state *state);
int nf_conntrack_dccp_packet(struct nf_conn *ct,
struct sk_buff *skb,
unsigned int dataoff,
enum ip_conntrack_info ctinfo,
const struct nf_hook_state *state);
int nf_conntrack_sctp_packet(struct nf_conn *ct,
struct sk_buff *skb,
unsigned int dataoff,
enum ip_conntrack_info ctinfo,
const struct nf_hook_state *state);
int nf_conntrack_gre_packet(struct nf_conn *ct,
struct sk_buff *skb,
unsigned int dataoff,
enum ip_conntrack_info ctinfo,
const struct nf_hook_state *state);
void nf_conntrack_generic_init_net(struct net *net);
void nf_conntrack_tcp_init_net(struct net *net);
void nf_conntrack_udp_init_net(struct net *net);
void nf_conntrack_gre_init_net(struct net *net);
void nf_conntrack_dccp_init_net(struct net *net);
void nf_conntrack_sctp_init_net(struct net *net);
void nf_conntrack_icmp_init_net(struct net *net);
void nf_conntrack_icmpv6_init_net(struct net *net);
/* Existing built-in generic protocol */
extern const struct nf_conntrack_l4proto nf_conntrack_l4proto_generic;
#define MAX_NF_CT_PROTO IPPROTO_UDPLITE
const struct nf_conntrack_l4proto *nf_ct_l4proto_find(u8 l4proto);
/* Generic netlink helpers */
int nf_ct_port_tuple_to_nlattr(struct sk_buff *skb,
const struct nf_conntrack_tuple *tuple);
int nf_ct_port_nlattr_to_tuple(struct nlattr *tb[],
struct nf_conntrack_tuple *t,
u_int32_t flags);
unsigned int nf_ct_port_nlattr_tuple_size(void);
extern const struct nla_policy nf_ct_port_nla_policy[];
#ifdef CONFIG_SYSCTL
__printf(3, 4) __cold
void nf_ct_l4proto_log_invalid(const struct sk_buff *skb,
const struct nf_conn *ct,
const char *fmt, ...);
__printf(5, 6) __cold
void nf_l4proto_log_invalid(const struct sk_buff *skb,
struct net *net,
u16 pf, u8 protonum,
const char *fmt, ...);
#else
static inline __printf(5, 6) __cold
void nf_l4proto_log_invalid(const struct sk_buff *skb, struct net *net,
u16 pf, u8 protonum, const char *fmt, ...) {}
static inline __printf(3, 4) __cold
void nf_ct_l4proto_log_invalid(const struct sk_buff *skb,
const struct nf_conn *ct,
const char *fmt, ...) { }
#endif /* CONFIG_SYSCTL */
#if IS_ENABLED(CONFIG_NF_CONNTRACK)
static inline struct nf_generic_net *nf_generic_pernet(struct net *net)
{
return &net->ct.nf_ct_proto.generic;
}
static inline struct nf_tcp_net *nf_tcp_pernet(struct net *net)
{
return &net->ct.nf_ct_proto.tcp;
}
static inline struct nf_udp_net *nf_udp_pernet(struct net *net)
{
return &net->ct.nf_ct_proto.udp;
}
static inline struct nf_icmp_net *nf_icmp_pernet(struct net *net)
{
return &net->ct.nf_ct_proto.icmp;
}
static inline struct nf_icmp_net *nf_icmpv6_pernet(struct net *net)
{
return &net->ct.nf_ct_proto.icmpv6;
}
#endif
#ifdef CONFIG_NF_CT_PROTO_DCCP
static inline struct nf_dccp_net *nf_dccp_pernet(struct net *net)
{
return &net->ct.nf_ct_proto.dccp;
}
#endif
#ifdef CONFIG_NF_CT_PROTO_SCTP
static inline struct nf_sctp_net *nf_sctp_pernet(struct net *net)
{
return &net->ct.nf_ct_proto.sctp;
}
#endif
#ifdef CONFIG_NF_CT_PROTO_GRE
static inline struct nf_gre_net *nf_gre_pernet(struct net *net)
{
return &net->ct.nf_ct_proto.gre;
}
#endif
#endif /*_NF_CONNTRACK_PROTOCOL_H*/
|
