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
|
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Multipath TCP
*
* Copyright (c) 2017 - 2019, Intel Corporation.
*/
#ifndef __NET_MPTCP_H
#define __NET_MPTCP_H
#include <linux/skbuff.h>
#include <linux/tcp.h>
#include <linux/types.h>
/* MPTCP sk_buff extension data */
struct mptcp_ext {
u64 data_ack;
u64 data_seq;
u32 subflow_seq;
u16 data_len;
u8 use_map:1,
dsn64:1,
data_fin:1,
use_ack:1,
ack64:1,
mpc_map:1,
__unused:2;
/* one byte hole */
};
struct mptcp_out_options {
#if IS_ENABLED(CONFIG_MPTCP)
u16 suboptions;
u64 sndr_key;
u64 rcvr_key;
struct mptcp_ext ext_copy;
#endif
};
#ifdef CONFIG_MPTCP
void mptcp_init(void);
static inline bool sk_is_mptcp(const struct sock *sk)
{
return tcp_sk(sk)->is_mptcp;
}
static inline bool rsk_is_mptcp(const struct request_sock *req)
{
return tcp_rsk(req)->is_mptcp;
}
void mptcp_parse_option(const struct sk_buff *skb, const unsigned char *ptr,
int opsize, struct tcp_options_received *opt_rx);
bool mptcp_syn_options(struct sock *sk, const struct sk_buff *skb,
unsigned int *size, struct mptcp_out_options *opts);
void mptcp_rcv_synsent(struct sock *sk);
bool mptcp_synack_options(const struct request_sock *req, unsigned int *size,
struct mptcp_out_options *opts);
bool mptcp_established_options(struct sock *sk, struct sk_buff *skb,
unsigned int *size, unsigned int remaining,
struct mptcp_out_options *opts);
void mptcp_incoming_options(struct sock *sk, struct sk_buff *skb,
struct tcp_options_received *opt_rx);
void mptcp_write_options(__be32 *ptr, struct mptcp_out_options *opts);
/* move the skb extension owership, with the assumption that 'to' is
* newly allocated
*/
static inline void mptcp_skb_ext_move(struct sk_buff *to,
struct sk_buff *from)
{
if (!skb_ext_exist(from, SKB_EXT_MPTCP))
return;
if (WARN_ON_ONCE(to->active_extensions))
skb_ext_put(to);
to->active_extensions = from->active_extensions;
to->extensions = from->extensions;
from->active_extensions = 0;
}
static inline bool mptcp_ext_matches(const struct mptcp_ext *to_ext,
const struct mptcp_ext *from_ext)
{
/* MPTCP always clears the ext when adding it to the skb, so
* holes do not bother us here
*/
return !from_ext ||
(to_ext && from_ext &&
!memcmp(from_ext, to_ext, sizeof(struct mptcp_ext)));
}
/* check if skbs can be collapsed.
* MPTCP collapse is allowed if neither @to or @from carry an mptcp data
* mapping, or if the extension of @to is the same as @from.
* Collapsing is not possible if @to lacks an extension, but @from carries one.
*/
static inline bool mptcp_skb_can_collapse(const struct sk_buff *to,
const struct sk_buff *from)
{
return mptcp_ext_matches(skb_ext_find(to, SKB_EXT_MPTCP),
skb_ext_find(from, SKB_EXT_MPTCP));
}
#else
static inline void mptcp_init(void)
{
}
static inline bool sk_is_mptcp(const struct sock *sk)
{
return false;
}
static inline bool rsk_is_mptcp(const struct request_sock *req)
{
return false;
}
static inline void mptcp_parse_option(const struct sk_buff *skb,
const unsigned char *ptr, int opsize,
struct tcp_options_received *opt_rx)
{
}
static inline bool mptcp_syn_options(struct sock *sk, const struct sk_buff *skb,
unsigned int *size,
struct mptcp_out_options *opts)
{
return false;
}
static inline void mptcp_rcv_synsent(struct sock *sk)
{
}
static inline bool mptcp_synack_options(const struct request_sock *req,
unsigned int *size,
struct mptcp_out_options *opts)
{
return false;
}
static inline bool mptcp_established_options(struct sock *sk,
struct sk_buff *skb,
unsigned int *size,
unsigned int remaining,
struct mptcp_out_options *opts)
{
return false;
}
static inline void mptcp_incoming_options(struct sock *sk,
struct sk_buff *skb,
struct tcp_options_received *opt_rx)
{
}
static inline void mptcp_skb_ext_move(struct sk_buff *to,
const struct sk_buff *from)
{
}
static inline bool mptcp_skb_can_collapse(const struct sk_buff *to,
const struct sk_buff *from)
{
return true;
}
#endif /* CONFIG_MPTCP */
#if IS_ENABLED(CONFIG_MPTCP_IPV6)
int mptcpv6_init(void);
void mptcpv6_handle_mapped(struct sock *sk, bool mapped);
#elif IS_ENABLED(CONFIG_IPV6)
static inline int mptcpv6_init(void) { return 0; }
static inline void mptcpv6_handle_mapped(struct sock *sk, bool mapped) { }
#endif
#endif /* __NET_MPTCP_H */
|
