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3ee17bc7 MM |
1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | /* | |
3 | * Multipath TCP | |
4 | * | |
5 | * Copyright (c) 2017 - 2019, Intel Corporation. | |
6 | */ | |
7 | ||
8 | #ifndef __NET_MPTCP_H | |
9 | #define __NET_MPTCP_H | |
10 | ||
85712484 | 11 | #include <linux/skbuff.h> |
eda7acdd | 12 | #include <linux/tcp.h> |
3ee17bc7 MM |
13 | #include <linux/types.h> |
14 | ||
15 | /* MPTCP sk_buff extension data */ | |
16 | struct mptcp_ext { | |
17 | u64 data_ack; | |
18 | u64 data_seq; | |
19 | u32 subflow_seq; | |
20 | u16 data_len; | |
21 | u8 use_map:1, | |
22 | dsn64:1, | |
23 | data_fin:1, | |
24 | use_ack:1, | |
25 | ack64:1, | |
26 | __unused:3; | |
27 | /* one byte hole */ | |
28 | }; | |
29 | ||
eda7acdd PK |
30 | struct mptcp_out_options { |
31 | #if IS_ENABLED(CONFIG_MPTCP) | |
32 | u16 suboptions; | |
33 | u64 sndr_key; | |
34 | u64 rcvr_key; | |
6d0060f6 | 35 | struct mptcp_ext ext_copy; |
eda7acdd PK |
36 | #endif |
37 | }; | |
38 | ||
85712484 MM |
39 | #ifdef CONFIG_MPTCP |
40 | ||
f870fa0b MM |
41 | void mptcp_init(void); |
42 | ||
cec37a6e PK |
43 | static inline bool sk_is_mptcp(const struct sock *sk) |
44 | { | |
45 | return tcp_sk(sk)->is_mptcp; | |
46 | } | |
47 | ||
48 | static inline bool rsk_is_mptcp(const struct request_sock *req) | |
49 | { | |
50 | return tcp_rsk(req)->is_mptcp; | |
51 | } | |
52 | ||
eda7acdd PK |
53 | void mptcp_parse_option(const unsigned char *ptr, int opsize, |
54 | struct tcp_options_received *opt_rx); | |
cec37a6e PK |
55 | bool mptcp_syn_options(struct sock *sk, unsigned int *size, |
56 | struct mptcp_out_options *opts); | |
57 | void mptcp_rcv_synsent(struct sock *sk); | |
58 | bool mptcp_synack_options(const struct request_sock *req, unsigned int *size, | |
59 | struct mptcp_out_options *opts); | |
60 | bool mptcp_established_options(struct sock *sk, struct sk_buff *skb, | |
61 | unsigned int *size, unsigned int remaining, | |
62 | struct mptcp_out_options *opts); | |
63 | ||
eda7acdd PK |
64 | void mptcp_write_options(__be32 *ptr, struct mptcp_out_options *opts); |
65 | ||
85712484 MM |
66 | /* move the skb extension owership, with the assumption that 'to' is |
67 | * newly allocated | |
68 | */ | |
69 | static inline void mptcp_skb_ext_move(struct sk_buff *to, | |
70 | struct sk_buff *from) | |
71 | { | |
72 | if (!skb_ext_exist(from, SKB_EXT_MPTCP)) | |
73 | return; | |
74 | ||
75 | if (WARN_ON_ONCE(to->active_extensions)) | |
76 | skb_ext_put(to); | |
77 | ||
78 | to->active_extensions = from->active_extensions; | |
79 | to->extensions = from->extensions; | |
80 | from->active_extensions = 0; | |
81 | } | |
82 | ||
83 | static inline bool mptcp_ext_matches(const struct mptcp_ext *to_ext, | |
84 | const struct mptcp_ext *from_ext) | |
85 | { | |
86 | /* MPTCP always clears the ext when adding it to the skb, so | |
87 | * holes do not bother us here | |
88 | */ | |
89 | return !from_ext || | |
90 | (to_ext && from_ext && | |
91 | !memcmp(from_ext, to_ext, sizeof(struct mptcp_ext))); | |
92 | } | |
93 | ||
94 | /* check if skbs can be collapsed. | |
95 | * MPTCP collapse is allowed if neither @to or @from carry an mptcp data | |
96 | * mapping, or if the extension of @to is the same as @from. | |
97 | * Collapsing is not possible if @to lacks an extension, but @from carries one. | |
98 | */ | |
99 | static inline bool mptcp_skb_can_collapse(const struct sk_buff *to, | |
100 | const struct sk_buff *from) | |
101 | { | |
102 | return mptcp_ext_matches(skb_ext_find(to, SKB_EXT_MPTCP), | |
103 | skb_ext_find(from, SKB_EXT_MPTCP)); | |
104 | } | |
105 | ||
106 | #else | |
107 | ||
f870fa0b MM |
108 | static inline void mptcp_init(void) |
109 | { | |
110 | } | |
111 | ||
cec37a6e PK |
112 | static inline bool sk_is_mptcp(const struct sock *sk) |
113 | { | |
114 | return false; | |
115 | } | |
116 | ||
117 | static inline bool rsk_is_mptcp(const struct request_sock *req) | |
118 | { | |
119 | return false; | |
120 | } | |
121 | ||
eda7acdd PK |
122 | static inline void mptcp_parse_option(const unsigned char *ptr, int opsize, |
123 | struct tcp_options_received *opt_rx) | |
124 | { | |
125 | } | |
126 | ||
cec37a6e PK |
127 | static inline bool mptcp_syn_options(struct sock *sk, unsigned int *size, |
128 | struct mptcp_out_options *opts) | |
129 | { | |
130 | return false; | |
131 | } | |
132 | ||
133 | static inline void mptcp_rcv_synsent(struct sock *sk) | |
134 | { | |
135 | } | |
136 | ||
137 | static inline bool mptcp_synack_options(const struct request_sock *req, | |
138 | unsigned int *size, | |
139 | struct mptcp_out_options *opts) | |
140 | { | |
141 | return false; | |
142 | } | |
143 | ||
144 | static inline bool mptcp_established_options(struct sock *sk, | |
145 | struct sk_buff *skb, | |
146 | unsigned int *size, | |
147 | unsigned int remaining, | |
148 | struct mptcp_out_options *opts) | |
149 | { | |
150 | return false; | |
151 | } | |
152 | ||
85712484 MM |
153 | static inline void mptcp_skb_ext_move(struct sk_buff *to, |
154 | const struct sk_buff *from) | |
155 | { | |
156 | } | |
157 | ||
158 | static inline bool mptcp_skb_can_collapse(const struct sk_buff *to, | |
159 | const struct sk_buff *from) | |
160 | { | |
161 | return true; | |
162 | } | |
163 | ||
164 | #endif /* CONFIG_MPTCP */ | |
f870fa0b | 165 | |
cec37a6e PK |
166 | void mptcp_handle_ipv6_mapped(struct sock *sk, bool mapped); |
167 | ||
f870fa0b MM |
168 | #if IS_ENABLED(CONFIG_MPTCP_IPV6) |
169 | int mptcpv6_init(void); | |
170 | #elif IS_ENABLED(CONFIG_IPV6) | |
171 | static inline int mptcpv6_init(void) | |
172 | { | |
173 | return 0; | |
174 | } | |
175 | #endif | |
176 | ||
3ee17bc7 | 177 | #endif /* __NET_MPTCP_H */ |