Commit | Line | Data |
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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 | ||
fc518953 FW |
15 | struct seq_file; |
16 | ||
3ee17bc7 MM |
17 | /* MPTCP sk_buff extension data */ |
18 | struct mptcp_ext { | |
a0c1d0ea CP |
19 | union { |
20 | u64 data_ack; | |
21 | u32 data_ack32; | |
22 | }; | |
3ee17bc7 MM |
23 | u64 data_seq; |
24 | u32 subflow_seq; | |
25 | u16 data_len; | |
26 | u8 use_map:1, | |
27 | dsn64:1, | |
28 | data_fin:1, | |
29 | use_ack:1, | |
30 | ack64:1, | |
cc7972ea | 31 | mpc_map:1, |
5a369ca6 PA |
32 | frozen:1, |
33 | __unused:1; | |
3ee17bc7 MM |
34 | /* one byte hole */ |
35 | }; | |
36 | ||
eda7acdd PK |
37 | struct mptcp_out_options { |
38 | #if IS_ENABLED(CONFIG_MPTCP) | |
39 | u16 suboptions; | |
40 | u64 sndr_key; | |
41 | u64 rcvr_key; | |
3df523ab PK |
42 | union { |
43 | struct in_addr addr; | |
44 | #if IS_ENABLED(CONFIG_MPTCP_IPV6) | |
45 | struct in6_addr addr6; | |
46 | #endif | |
47 | }; | |
48 | u8 addr_id; | |
22fb85ff | 49 | u16 port; |
3df523ab PK |
50 | u64 ahmac; |
51 | u8 rm_id; | |
f296234c PK |
52 | u8 join_id; |
53 | u8 backup; | |
54 | u32 nonce; | |
55 | u64 thmac; | |
ec3edaa7 PK |
56 | u32 token; |
57 | u8 hmac[20]; | |
6d0060f6 | 58 | struct mptcp_ext ext_copy; |
eda7acdd PK |
59 | #endif |
60 | }; | |
61 | ||
85712484 | 62 | #ifdef CONFIG_MPTCP |
08b8d080 | 63 | extern struct request_sock_ops mptcp_subflow_request_sock_ops; |
85712484 | 64 | |
f870fa0b MM |
65 | void mptcp_init(void); |
66 | ||
cec37a6e PK |
67 | static inline bool sk_is_mptcp(const struct sock *sk) |
68 | { | |
69 | return tcp_sk(sk)->is_mptcp; | |
70 | } | |
71 | ||
72 | static inline bool rsk_is_mptcp(const struct request_sock *req) | |
73 | { | |
74 | return tcp_rsk(req)->is_mptcp; | |
75 | } | |
76 | ||
90bf4513 PA |
77 | static inline bool rsk_drop_req(const struct request_sock *req) |
78 | { | |
79 | return tcp_rsk(req)->is_mptcp && tcp_rsk(req)->drop_req; | |
80 | } | |
81 | ||
071c8ed6 | 82 | void mptcp_space(const struct sock *ssk, int *space, int *full_space); |
cc7972ea CP |
83 | bool mptcp_syn_options(struct sock *sk, const struct sk_buff *skb, |
84 | unsigned int *size, struct mptcp_out_options *opts); | |
cec37a6e PK |
85 | bool mptcp_synack_options(const struct request_sock *req, unsigned int *size, |
86 | struct mptcp_out_options *opts); | |
87 | bool mptcp_established_options(struct sock *sk, struct sk_buff *skb, | |
88 | unsigned int *size, unsigned int remaining, | |
89 | struct mptcp_out_options *opts); | |
77d0cab9 | 90 | void mptcp_incoming_options(struct sock *sk, struct sk_buff *skb); |
cec37a6e | 91 | |
fa3fe2b1 FW |
92 | void mptcp_write_options(__be32 *ptr, const struct tcp_sock *tp, |
93 | struct mptcp_out_options *opts); | |
eda7acdd | 94 | |
85712484 MM |
95 | /* move the skb extension owership, with the assumption that 'to' is |
96 | * newly allocated | |
97 | */ | |
98 | static inline void mptcp_skb_ext_move(struct sk_buff *to, | |
99 | struct sk_buff *from) | |
100 | { | |
101 | if (!skb_ext_exist(from, SKB_EXT_MPTCP)) | |
102 | return; | |
103 | ||
104 | if (WARN_ON_ONCE(to->active_extensions)) | |
105 | skb_ext_put(to); | |
106 | ||
107 | to->active_extensions = from->active_extensions; | |
108 | to->extensions = from->extensions; | |
109 | from->active_extensions = 0; | |
110 | } | |
111 | ||
5a369ca6 PA |
112 | static inline void mptcp_skb_ext_copy(struct sk_buff *to, |
113 | struct sk_buff *from) | |
114 | { | |
115 | struct mptcp_ext *from_ext; | |
116 | ||
117 | from_ext = skb_ext_find(from, SKB_EXT_MPTCP); | |
118 | if (!from_ext) | |
119 | return; | |
120 | ||
121 | from_ext->frozen = 1; | |
122 | skb_ext_copy(to, from); | |
123 | } | |
124 | ||
85712484 MM |
125 | static inline bool mptcp_ext_matches(const struct mptcp_ext *to_ext, |
126 | const struct mptcp_ext *from_ext) | |
127 | { | |
128 | /* MPTCP always clears the ext when adding it to the skb, so | |
129 | * holes do not bother us here | |
130 | */ | |
131 | return !from_ext || | |
132 | (to_ext && from_ext && | |
133 | !memcmp(from_ext, to_ext, sizeof(struct mptcp_ext))); | |
134 | } | |
135 | ||
136 | /* check if skbs can be collapsed. | |
137 | * MPTCP collapse is allowed if neither @to or @from carry an mptcp data | |
138 | * mapping, or if the extension of @to is the same as @from. | |
139 | * Collapsing is not possible if @to lacks an extension, but @from carries one. | |
140 | */ | |
141 | static inline bool mptcp_skb_can_collapse(const struct sk_buff *to, | |
142 | const struct sk_buff *from) | |
143 | { | |
144 | return mptcp_ext_matches(skb_ext_find(to, SKB_EXT_MPTCP), | |
145 | skb_ext_find(from, SKB_EXT_MPTCP)); | |
146 | } | |
147 | ||
fc518953 | 148 | void mptcp_seq_show(struct seq_file *seq); |
c83a47e5 FW |
149 | int mptcp_subflow_init_cookie_req(struct request_sock *req, |
150 | const struct sock *sk_listener, | |
151 | struct sk_buff *skb); | |
85712484 MM |
152 | #else |
153 | ||
f870fa0b MM |
154 | static inline void mptcp_init(void) |
155 | { | |
156 | } | |
157 | ||
cec37a6e PK |
158 | static inline bool sk_is_mptcp(const struct sock *sk) |
159 | { | |
160 | return false; | |
161 | } | |
162 | ||
163 | static inline bool rsk_is_mptcp(const struct request_sock *req) | |
164 | { | |
165 | return false; | |
166 | } | |
167 | ||
90bf4513 PA |
168 | static inline bool rsk_drop_req(const struct request_sock *req) |
169 | { | |
170 | return false; | |
171 | } | |
172 | ||
cc7972ea CP |
173 | static inline void mptcp_parse_option(const struct sk_buff *skb, |
174 | const unsigned char *ptr, int opsize, | |
eda7acdd PK |
175 | struct tcp_options_received *opt_rx) |
176 | { | |
177 | } | |
178 | ||
cc7972ea CP |
179 | static inline bool mptcp_syn_options(struct sock *sk, const struct sk_buff *skb, |
180 | unsigned int *size, | |
cec37a6e PK |
181 | struct mptcp_out_options *opts) |
182 | { | |
183 | return false; | |
184 | } | |
185 | ||
cec37a6e PK |
186 | static inline bool mptcp_synack_options(const struct request_sock *req, |
187 | unsigned int *size, | |
188 | struct mptcp_out_options *opts) | |
189 | { | |
190 | return false; | |
191 | } | |
192 | ||
193 | static inline bool mptcp_established_options(struct sock *sk, | |
194 | struct sk_buff *skb, | |
195 | unsigned int *size, | |
196 | unsigned int remaining, | |
197 | struct mptcp_out_options *opts) | |
198 | { | |
199 | return false; | |
200 | } | |
201 | ||
648ef4b8 | 202 | static inline void mptcp_incoming_options(struct sock *sk, |
77d0cab9 | 203 | struct sk_buff *skb) |
648ef4b8 MM |
204 | { |
205 | } | |
206 | ||
85712484 MM |
207 | static inline void mptcp_skb_ext_move(struct sk_buff *to, |
208 | const struct sk_buff *from) | |
209 | { | |
210 | } | |
211 | ||
5a369ca6 PA |
212 | static inline void mptcp_skb_ext_copy(struct sk_buff *to, |
213 | struct sk_buff *from) | |
214 | { | |
215 | } | |
216 | ||
85712484 MM |
217 | static inline bool mptcp_skb_can_collapse(const struct sk_buff *to, |
218 | const struct sk_buff *from) | |
219 | { | |
220 | return true; | |
221 | } | |
222 | ||
071c8ed6 | 223 | static inline void mptcp_space(const struct sock *ssk, int *s, int *fs) { } |
fc518953 | 224 | static inline void mptcp_seq_show(struct seq_file *seq) { } |
c83a47e5 FW |
225 | |
226 | static inline int mptcp_subflow_init_cookie_req(struct request_sock *req, | |
227 | const struct sock *sk_listener, | |
228 | struct sk_buff *skb) | |
229 | { | |
230 | return 0; /* TCP fallback */ | |
231 | } | |
85712484 | 232 | #endif /* CONFIG_MPTCP */ |
f870fa0b MM |
233 | |
234 | #if IS_ENABLED(CONFIG_MPTCP_IPV6) | |
235 | int mptcpv6_init(void); | |
31484d56 | 236 | void mptcpv6_handle_mapped(struct sock *sk, bool mapped); |
f870fa0b | 237 | #elif IS_ENABLED(CONFIG_IPV6) |
31484d56 GU |
238 | static inline int mptcpv6_init(void) { return 0; } |
239 | static inline void mptcpv6_handle_mapped(struct sock *sk, bool mapped) { } | |
f870fa0b MM |
240 | #endif |
241 | ||
3ee17bc7 | 242 | #endif /* __NET_MPTCP_H */ |