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8#ifndef __NET_MPTCP_H
9#define __NET_MPTCP_H
10
11#include <linux/skbuff.h>
12#include <linux/tcp.h>
13#include <linux/types.h>
14
15struct mptcp_info;
16struct mptcp_sock;
17struct seq_file;
18
19
20struct mptcp_ext {
21 union {
22 u64 data_ack;
23 u32 data_ack32;
24 };
25 u64 data_seq;
26 u32 subflow_seq;
27 u16 data_len;
28 __sum16 csum;
29 u8 use_map:1,
30 dsn64:1,
31 data_fin:1,
32 use_ack:1,
33 ack64:1,
34 mpc_map:1,
35 frozen:1,
36 reset_transient:1;
37 u8 reset_reason:4,
38 csum_reqd:1;
39};
40
41#define MPTCP_RM_IDS_MAX 8
42
43struct mptcp_rm_list {
44 u8 ids[MPTCP_RM_IDS_MAX];
45 u8 nr;
46};
47
48struct mptcp_addr_info {
49 u8 id;
50 sa_family_t family;
51 __be16 port;
52 union {
53 struct in_addr addr;
54#if IS_ENABLED(CONFIG_MPTCP_IPV6)
55 struct in6_addr addr6;
56#endif
57 };
58};
59
60struct mptcp_out_options {
61#if IS_ENABLED(CONFIG_MPTCP)
62 u16 suboptions;
63 struct mptcp_rm_list rm_list;
64 u8 join_id;
65 u8 backup;
66 u8 reset_reason:4,
67 reset_transient:1,
68 csum_reqd:1,
69 allow_join_id0:1;
70 union {
71 struct {
72 u64 sndr_key;
73 u64 rcvr_key;
74 u64 data_seq;
75 u32 subflow_seq;
76 u16 data_len;
77 __sum16 csum;
78 };
79 struct {
80 struct mptcp_addr_info addr;
81 u64 ahmac;
82 };
83 struct {
84 struct mptcp_ext ext_copy;
85 u64 fail_seq;
86 };
87 struct {
88 u32 nonce;
89 u32 token;
90 u64 thmac;
91 u8 hmac[20];
92 };
93 };
94#endif
95};
96
97#ifdef CONFIG_MPTCP
98extern struct request_sock_ops mptcp_subflow_request_sock_ops;
99
100void mptcp_init(void);
101
102static inline bool sk_is_mptcp(const struct sock *sk)
103{
104 return tcp_sk(sk)->is_mptcp;
105}
106
107static inline bool rsk_is_mptcp(const struct request_sock *req)
108{
109 return tcp_rsk(req)->is_mptcp;
110}
111
112static inline bool rsk_drop_req(const struct request_sock *req)
113{
114 return tcp_rsk(req)->is_mptcp && tcp_rsk(req)->drop_req;
115}
116
117void mptcp_space(const struct sock *ssk, int *space, int *full_space);
118bool mptcp_syn_options(struct sock *sk, const struct sk_buff *skb,
119 unsigned int *size, struct mptcp_out_options *opts);
120bool mptcp_synack_options(const struct request_sock *req, unsigned int *size,
121 struct mptcp_out_options *opts);
122bool mptcp_established_options(struct sock *sk, struct sk_buff *skb,
123 unsigned int *size, unsigned int remaining,
124 struct mptcp_out_options *opts);
125bool mptcp_incoming_options(struct sock *sk, struct sk_buff *skb);
126
127void mptcp_write_options(__be32 *ptr, const struct tcp_sock *tp,
128 struct mptcp_out_options *opts);
129
130void mptcp_diag_fill_info(struct mptcp_sock *msk, struct mptcp_info *info);
131
132
133
134
135static inline void mptcp_skb_ext_move(struct sk_buff *to,
136 struct sk_buff *from)
137{
138 if (!skb_ext_exist(from, SKB_EXT_MPTCP))
139 return;
140
141 if (WARN_ON_ONCE(to->active_extensions))
142 skb_ext_put(to);
143
144 to->active_extensions = from->active_extensions;
145 to->extensions = from->extensions;
146 from->active_extensions = 0;
147}
148
149static inline void mptcp_skb_ext_copy(struct sk_buff *to,
150 struct sk_buff *from)
151{
152 struct mptcp_ext *from_ext;
153
154 from_ext = skb_ext_find(from, SKB_EXT_MPTCP);
155 if (!from_ext)
156 return;
157
158 from_ext->frozen = 1;
159 skb_ext_copy(to, from);
160}
161
162static inline bool mptcp_ext_matches(const struct mptcp_ext *to_ext,
163 const struct mptcp_ext *from_ext)
164{
165
166
167
168 return !from_ext ||
169 (to_ext && from_ext &&
170 !memcmp(from_ext, to_ext, sizeof(struct mptcp_ext)));
171}
172
173
174
175
176
177
178static inline bool mptcp_skb_can_collapse(const struct sk_buff *to,
179 const struct sk_buff *from)
180{
181 return mptcp_ext_matches(skb_ext_find(to, SKB_EXT_MPTCP),
182 skb_ext_find(from, SKB_EXT_MPTCP));
183}
184
185void mptcp_seq_show(struct seq_file *seq);
186int mptcp_subflow_init_cookie_req(struct request_sock *req,
187 const struct sock *sk_listener,
188 struct sk_buff *skb);
189
190__be32 mptcp_get_reset_option(const struct sk_buff *skb);
191
192static inline __be32 mptcp_reset_option(const struct sk_buff *skb)
193{
194 if (skb_ext_exist(skb, SKB_EXT_MPTCP))
195 return mptcp_get_reset_option(skb);
196
197 return htonl(0u);
198}
199#else
200
201static inline void mptcp_init(void)
202{
203}
204
205static inline bool sk_is_mptcp(const struct sock *sk)
206{
207 return false;
208}
209
210static inline bool rsk_is_mptcp(const struct request_sock *req)
211{
212 return false;
213}
214
215static inline bool rsk_drop_req(const struct request_sock *req)
216{
217 return false;
218}
219
220static inline bool mptcp_syn_options(struct sock *sk, const struct sk_buff *skb,
221 unsigned int *size,
222 struct mptcp_out_options *opts)
223{
224 return false;
225}
226
227static inline bool mptcp_synack_options(const struct request_sock *req,
228 unsigned int *size,
229 struct mptcp_out_options *opts)
230{
231 return false;
232}
233
234static inline bool mptcp_established_options(struct sock *sk,
235 struct sk_buff *skb,
236 unsigned int *size,
237 unsigned int remaining,
238 struct mptcp_out_options *opts)
239{
240 return false;
241}
242
243static inline bool mptcp_incoming_options(struct sock *sk,
244 struct sk_buff *skb)
245{
246 return true;
247}
248
249static inline void mptcp_skb_ext_move(struct sk_buff *to,
250 const struct sk_buff *from)
251{
252}
253
254static inline void mptcp_skb_ext_copy(struct sk_buff *to,
255 struct sk_buff *from)
256{
257}
258
259static inline bool mptcp_skb_can_collapse(const struct sk_buff *to,
260 const struct sk_buff *from)
261{
262 return true;
263}
264
265static inline void mptcp_space(const struct sock *ssk, int *s, int *fs) { }
266static inline void mptcp_seq_show(struct seq_file *seq) { }
267
268static inline int mptcp_subflow_init_cookie_req(struct request_sock *req,
269 const struct sock *sk_listener,
270 struct sk_buff *skb)
271{
272 return 0;
273}
274
275static inline __be32 mptcp_reset_option(const struct sk_buff *skb) { return htonl(0u); }
276#endif
277
278#if IS_ENABLED(CONFIG_MPTCP_IPV6)
279int mptcpv6_init(void);
280void mptcpv6_handle_mapped(struct sock *sk, bool mapped);
281#elif IS_ENABLED(CONFIG_IPV6)
282static inline int mptcpv6_init(void) { return 0; }
283static inline void mptcpv6_handle_mapped(struct sock *sk, bool mapped) { }
284#endif
285
286#endif
287
