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 | ||
61bc6e82 FW |
15 | struct mptcp_info; |
16 | struct mptcp_sock; | |
fc518953 FW |
17 | struct seq_file; |
18 | ||
3ee17bc7 MM |
19 | /* MPTCP sk_buff extension data */ |
20 | struct mptcp_ext { | |
a0c1d0ea CP |
21 | union { |
22 | u64 data_ack; | |
23 | u32 data_ack32; | |
24 | }; | |
3ee17bc7 MM |
25 | u64 data_seq; |
26 | u32 subflow_seq; | |
27 | u16 data_len; | |
d0cc2987 | 28 | __sum16 csum; |
3ee17bc7 MM |
29 | u8 use_map:1, |
30 | dsn64:1, | |
31 | data_fin:1, | |
32 | use_ack:1, | |
33 | ack64:1, | |
cc7972ea | 34 | mpc_map:1, |
5a369ca6 | 35 | frozen:1, |
dc87efdb | 36 | reset_transient:1; |
208e8f66 | 37 | u8 reset_reason:4, |
1e39e5a3 GT |
38 | csum_reqd:1, |
39 | infinite_map:1; | |
3ee17bc7 MM |
40 | }; |
41 | ||
6445e17a GT |
42 | #define MPTCP_RM_IDS_MAX 8 |
43 | ||
44 | struct mptcp_rm_list { | |
45 | u8 ids[MPTCP_RM_IDS_MAX]; | |
46 | u8 nr; | |
47 | }; | |
48 | ||
30f60bae GT |
49 | struct mptcp_addr_info { |
50 | u8 id; | |
51 | sa_family_t family; | |
52 | __be16 port; | |
53 | union { | |
54 | struct in_addr addr; | |
55 | #if IS_ENABLED(CONFIG_MPTCP_IPV6) | |
56 | struct in6_addr addr6; | |
57 | #endif | |
58 | }; | |
59 | }; | |
60 | ||
eda7acdd PK |
61 | struct mptcp_out_options { |
62 | #if IS_ENABLED(CONFIG_MPTCP) | |
63 | u16 suboptions; | |
6445e17a | 64 | struct mptcp_rm_list rm_list; |
f296234c PK |
65 | u8 join_id; |
66 | u8 backup; | |
06fe1719 GT |
67 | u8 reset_reason:4, |
68 | reset_transient:1, | |
bab6b88e GT |
69 | csum_reqd:1, |
70 | allow_join_id0:1; | |
d7b26908 PA |
71 | union { |
72 | struct { | |
73 | u64 sndr_key; | |
74 | u64 rcvr_key; | |
f7cc8890 DC |
75 | u64 data_seq; |
76 | u32 subflow_seq; | |
77 | u16 data_len; | |
78 | __sum16 csum; | |
d7b26908 PA |
79 | }; |
80 | struct { | |
81 | struct mptcp_addr_info addr; | |
82 | u64 ahmac; | |
83 | }; | |
c25aeb4e GT |
84 | struct { |
85 | struct mptcp_ext ext_copy; | |
86 | u64 fail_seq; | |
87 | }; | |
d7b26908 PA |
88 | struct { |
89 | u32 nonce; | |
90 | u32 token; | |
91 | u64 thmac; | |
92 | u8 hmac[20]; | |
93 | }; | |
94 | }; | |
eda7acdd PK |
95 | #endif |
96 | }; | |
97 | ||
85712484 | 98 | #ifdef CONFIG_MPTCP |
08b8d080 | 99 | extern struct request_sock_ops mptcp_subflow_request_sock_ops; |
85712484 | 100 | |
f870fa0b MM |
101 | void mptcp_init(void); |
102 | ||
cec37a6e PK |
103 | static inline bool sk_is_mptcp(const struct sock *sk) |
104 | { | |
105 | return tcp_sk(sk)->is_mptcp; | |
106 | } | |
107 | ||
108 | static inline bool rsk_is_mptcp(const struct request_sock *req) | |
109 | { | |
110 | return tcp_rsk(req)->is_mptcp; | |
111 | } | |
112 | ||
90bf4513 PA |
113 | static inline bool rsk_drop_req(const struct request_sock *req) |
114 | { | |
115 | return tcp_rsk(req)->is_mptcp && tcp_rsk(req)->drop_req; | |
116 | } | |
117 | ||
071c8ed6 | 118 | void mptcp_space(const struct sock *ssk, int *space, int *full_space); |
cc7972ea CP |
119 | bool mptcp_syn_options(struct sock *sk, const struct sk_buff *skb, |
120 | unsigned int *size, struct mptcp_out_options *opts); | |
cec37a6e PK |
121 | bool mptcp_synack_options(const struct request_sock *req, unsigned int *size, |
122 | struct mptcp_out_options *opts); | |
123 | bool mptcp_established_options(struct sock *sk, struct sk_buff *skb, | |
124 | unsigned int *size, unsigned int remaining, | |
125 | struct mptcp_out_options *opts); | |
6787b7e3 | 126 | bool mptcp_incoming_options(struct sock *sk, struct sk_buff *skb); |
cec37a6e | 127 | |
ea66758c | 128 | void mptcp_write_options(struct tcphdr *th, __be32 *ptr, struct tcp_sock *tp, |
fa3fe2b1 | 129 | struct mptcp_out_options *opts); |
eda7acdd | 130 | |
61bc6e82 FW |
131 | void mptcp_diag_fill_info(struct mptcp_sock *msk, struct mptcp_info *info); |
132 | ||
85712484 MM |
133 | /* move the skb extension owership, with the assumption that 'to' is |
134 | * newly allocated | |
135 | */ | |
136 | static inline void mptcp_skb_ext_move(struct sk_buff *to, | |
137 | struct sk_buff *from) | |
138 | { | |
139 | if (!skb_ext_exist(from, SKB_EXT_MPTCP)) | |
140 | return; | |
141 | ||
142 | if (WARN_ON_ONCE(to->active_extensions)) | |
143 | skb_ext_put(to); | |
144 | ||
145 | to->active_extensions = from->active_extensions; | |
146 | to->extensions = from->extensions; | |
147 | from->active_extensions = 0; | |
148 | } | |
149 | ||
5a369ca6 PA |
150 | static inline void mptcp_skb_ext_copy(struct sk_buff *to, |
151 | struct sk_buff *from) | |
152 | { | |
153 | struct mptcp_ext *from_ext; | |
154 | ||
155 | from_ext = skb_ext_find(from, SKB_EXT_MPTCP); | |
156 | if (!from_ext) | |
157 | return; | |
158 | ||
159 | from_ext->frozen = 1; | |
160 | skb_ext_copy(to, from); | |
161 | } | |
162 | ||
85712484 MM |
163 | static inline bool mptcp_ext_matches(const struct mptcp_ext *to_ext, |
164 | const struct mptcp_ext *from_ext) | |
165 | { | |
166 | /* MPTCP always clears the ext when adding it to the skb, so | |
167 | * holes do not bother us here | |
168 | */ | |
169 | return !from_ext || | |
170 | (to_ext && from_ext && | |
171 | !memcmp(from_ext, to_ext, sizeof(struct mptcp_ext))); | |
172 | } | |
173 | ||
174 | /* check if skbs can be collapsed. | |
175 | * MPTCP collapse is allowed if neither @to or @from carry an mptcp data | |
176 | * mapping, or if the extension of @to is the same as @from. | |
177 | * Collapsing is not possible if @to lacks an extension, but @from carries one. | |
178 | */ | |
179 | static inline bool mptcp_skb_can_collapse(const struct sk_buff *to, | |
180 | const struct sk_buff *from) | |
181 | { | |
182 | return mptcp_ext_matches(skb_ext_find(to, SKB_EXT_MPTCP), | |
183 | skb_ext_find(from, SKB_EXT_MPTCP)); | |
184 | } | |
185 | ||
fc518953 | 186 | void mptcp_seq_show(struct seq_file *seq); |
c83a47e5 FW |
187 | int mptcp_subflow_init_cookie_req(struct request_sock *req, |
188 | const struct sock *sk_listener, | |
189 | struct sk_buff *skb); | |
dc87efdb FW |
190 | |
191 | __be32 mptcp_get_reset_option(const struct sk_buff *skb); | |
192 | ||
193 | static inline __be32 mptcp_reset_option(const struct sk_buff *skb) | |
194 | { | |
195 | if (skb_ext_exist(skb, SKB_EXT_MPTCP)) | |
196 | return mptcp_get_reset_option(skb); | |
197 | ||
198 | return htonl(0u); | |
199 | } | |
85712484 MM |
200 | #else |
201 | ||
f870fa0b MM |
202 | static inline void mptcp_init(void) |
203 | { | |
204 | } | |
205 | ||
cec37a6e PK |
206 | static inline bool sk_is_mptcp(const struct sock *sk) |
207 | { | |
208 | return false; | |
209 | } | |
210 | ||
211 | static inline bool rsk_is_mptcp(const struct request_sock *req) | |
212 | { | |
213 | return false; | |
214 | } | |
215 | ||
90bf4513 PA |
216 | static inline bool rsk_drop_req(const struct request_sock *req) |
217 | { | |
218 | return false; | |
219 | } | |
220 | ||
cc7972ea CP |
221 | static inline bool mptcp_syn_options(struct sock *sk, const struct sk_buff *skb, |
222 | unsigned int *size, | |
cec37a6e PK |
223 | struct mptcp_out_options *opts) |
224 | { | |
225 | return false; | |
226 | } | |
227 | ||
cec37a6e PK |
228 | static inline bool mptcp_synack_options(const struct request_sock *req, |
229 | unsigned int *size, | |
230 | struct mptcp_out_options *opts) | |
231 | { | |
232 | return false; | |
233 | } | |
234 | ||
235 | static inline bool mptcp_established_options(struct sock *sk, | |
236 | struct sk_buff *skb, | |
237 | unsigned int *size, | |
238 | unsigned int remaining, | |
239 | struct mptcp_out_options *opts) | |
240 | { | |
241 | return false; | |
242 | } | |
243 | ||
6787b7e3 | 244 | static inline bool mptcp_incoming_options(struct sock *sk, |
77d0cab9 | 245 | struct sk_buff *skb) |
648ef4b8 | 246 | { |
6787b7e3 | 247 | return true; |
648ef4b8 MM |
248 | } |
249 | ||
85712484 MM |
250 | static inline void mptcp_skb_ext_move(struct sk_buff *to, |
251 | const struct sk_buff *from) | |
252 | { | |
253 | } | |
254 | ||
5a369ca6 PA |
255 | static inline void mptcp_skb_ext_copy(struct sk_buff *to, |
256 | struct sk_buff *from) | |
257 | { | |
258 | } | |
259 | ||
85712484 MM |
260 | static inline bool mptcp_skb_can_collapse(const struct sk_buff *to, |
261 | const struct sk_buff *from) | |
262 | { | |
263 | return true; | |
264 | } | |
265 | ||
071c8ed6 | 266 | static inline void mptcp_space(const struct sock *ssk, int *s, int *fs) { } |
fc518953 | 267 | static inline void mptcp_seq_show(struct seq_file *seq) { } |
c83a47e5 FW |
268 | |
269 | static inline int mptcp_subflow_init_cookie_req(struct request_sock *req, | |
270 | const struct sock *sk_listener, | |
271 | struct sk_buff *skb) | |
272 | { | |
273 | return 0; /* TCP fallback */ | |
274 | } | |
dc87efdb FW |
275 | |
276 | static inline __be32 mptcp_reset_option(const struct sk_buff *skb) { return htonl(0u); } | |
85712484 | 277 | #endif /* CONFIG_MPTCP */ |
f870fa0b MM |
278 | |
279 | #if IS_ENABLED(CONFIG_MPTCP_IPV6) | |
280 | int mptcpv6_init(void); | |
31484d56 | 281 | void mptcpv6_handle_mapped(struct sock *sk, bool mapped); |
f870fa0b | 282 | #elif IS_ENABLED(CONFIG_IPV6) |
31484d56 GU |
283 | static inline int mptcpv6_init(void) { return 0; } |
284 | static inline void mptcpv6_handle_mapped(struct sock *sk, bool mapped) { } | |
f870fa0b MM |
285 | #endif |
286 | ||
3bc253c2 GT |
287 | #if defined(CONFIG_MPTCP) && defined(CONFIG_BPF_SYSCALL) |
288 | struct mptcp_sock *bpf_mptcp_sock_from_subflow(struct sock *sk); | |
289 | #else | |
290 | static inline struct mptcp_sock *bpf_mptcp_sock_from_subflow(struct sock *sk) { return NULL; } | |
291 | #endif | |
292 | ||
3ee17bc7 | 293 | #endif /* __NET_MPTCP_H */ |