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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 seq_file;
16
17
18struct mptcp_ext {
19 union {
20 u64 data_ack;
21 u32 data_ack32;
22 };
23 u64 data_seq;
24 u32 subflow_seq;
25 u16 data_len;
26 __sum16 csum;
27 u8 use_map:1,
28 dsn64:1,
29 data_fin:1,
30 use_ack:1,
31 ack64:1,
32 mpc_map:1,
33 frozen:1,
34 reset_transient:1;
35 u8 reset_reason:4,
36 csum_reqd:1;
37};
38
39#define MPTCP_RM_IDS_MAX 8
40
41struct mptcp_rm_list {
42 u8 ids[MPTCP_RM_IDS_MAX];
43 u8 nr;
44};
45
46struct mptcp_addr_info {
47 u8 id;
48 sa_family_t family;
49 __be16 port;
50 union {
51 struct in_addr addr;
52#if IS_ENABLED(CONFIG_MPTCP_IPV6)
53 struct in6_addr addr6;
54#endif
55 };
56};
57
58struct mptcp_out_options {
59#if IS_ENABLED(CONFIG_MPTCP)
60 u16 suboptions;
61 struct mptcp_rm_list rm_list;
62 u8 join_id;
63 u8 backup;
64 u8 reset_reason:4,
65 reset_transient:1,
66 csum_reqd:1,
67 allow_join_id0:1;
68 union {
69 struct {
70 u64 sndr_key;
71 u64 rcvr_key;
72 u64 data_seq;
73 u32 subflow_seq;
74 u16 data_len;
75 __sum16 csum;
76 };
77 struct {
78 struct mptcp_addr_info addr;
79 u64 ahmac;
80 };
81 struct {
82 struct mptcp_ext ext_copy;
83 u64 fail_seq;
84 };
85 struct {
86 u32 nonce;
87 u32 token;
88 u64 thmac;
89 u8 hmac[20];
90 };
91 };
92#endif
93};
94
95#ifdef CONFIG_MPTCP
96extern struct request_sock_ops mptcp_subflow_request_sock_ops;
97
98void mptcp_init(void);
99
100static inline bool sk_is_mptcp(const struct sock *sk)
101{
102 return tcp_sk(sk)->is_mptcp;
103}
104
105static inline bool rsk_is_mptcp(const struct request_sock *req)
106{
107 return tcp_rsk(req)->is_mptcp;
108}
109
110static inline bool rsk_drop_req(const struct request_sock *req)
111{
112 return tcp_rsk(req)->is_mptcp && tcp_rsk(req)->drop_req;
113}
114
115void mptcp_space(const struct sock *ssk, int *space, int *full_space);
116bool mptcp_syn_options(struct sock *sk, const struct sk_buff *skb,
117 unsigned int *size, struct mptcp_out_options *opts);
118bool mptcp_synack_options(const struct request_sock *req, unsigned int *size,
119 struct mptcp_out_options *opts);
120bool mptcp_established_options(struct sock *sk, struct sk_buff *skb,
121 unsigned int *size, unsigned int remaining,
122 struct mptcp_out_options *opts);
123bool mptcp_incoming_options(struct sock *sk, struct sk_buff *skb);
124
125void mptcp_write_options(__be32 *ptr, const struct tcp_sock *tp,
126 struct mptcp_out_options *opts);
127
128
129
130
131static inline void mptcp_skb_ext_move(struct sk_buff *to,
132 struct sk_buff *from)
133{
134 if (!skb_ext_exist(from, SKB_EXT_MPTCP))
135 return;
136
137 if (WARN_ON_ONCE(to->active_extensions))
138 skb_ext_put(to);
139
140 to->active_extensions = from->active_extensions;
141 to->extensions = from->extensions;
142 from->active_extensions = 0;
143}
144
145static inline void mptcp_skb_ext_copy(struct sk_buff *to,
146 struct sk_buff *from)
147{
148 struct mptcp_ext *from_ext;
149
150 from_ext = skb_ext_find(from, SKB_EXT_MPTCP);
151 if (!from_ext)
152 return;
153
154 from_ext->frozen = 1;
155 skb_ext_copy(to, from);
156}
157
158static inline bool mptcp_ext_matches(const struct mptcp_ext *to_ext,
159 const struct mptcp_ext *from_ext)
160{
161
162
163
164 return !from_ext ||
165 (to_ext && from_ext &&
166 !memcmp(from_ext, to_ext, sizeof(struct mptcp_ext)));
167}
168
169
170
171
172
173
174static inline bool mptcp_skb_can_collapse(const struct sk_buff *to,
175 const struct sk_buff *from)
176{
177 return mptcp_ext_matches(skb_ext_find(to, SKB_EXT_MPTCP),
178 skb_ext_find(from, SKB_EXT_MPTCP));
179}
180
181void mptcp_seq_show(struct seq_file *seq);
182int mptcp_subflow_init_cookie_req(struct request_sock *req,
183 const struct sock *sk_listener,
184 struct sk_buff *skb);
185
186__be32 mptcp_get_reset_option(const struct sk_buff *skb);
187
188static inline __be32 mptcp_reset_option(const struct sk_buff *skb)
189{
190 if (skb_ext_exist(skb, SKB_EXT_MPTCP))
191 return mptcp_get_reset_option(skb);
192
193 return htonl(0u);
194}
195#else
196
197static inline void mptcp_init(void)
198{
199}
200
201static inline bool sk_is_mptcp(const struct sock *sk)
202{
203 return false;
204}
205
206static inline bool rsk_is_mptcp(const struct request_sock *req)
207{
208 return false;
209}
210
211static inline bool rsk_drop_req(const struct request_sock *req)
212{
213 return false;
214}
215
216static inline void mptcp_parse_option(const struct sk_buff *skb,
217 const unsigned char *ptr, int opsize,
218 struct tcp_options_received *opt_rx)
219{
220}
221
222static inline bool mptcp_syn_options(struct sock *sk, const struct sk_buff *skb,
223 unsigned int *size,
224 struct mptcp_out_options *opts)
225{
226 return false;
227}
228
229static inline bool mptcp_synack_options(const struct request_sock *req,
230 unsigned int *size,
231 struct mptcp_out_options *opts)
232{
233 return false;
234}
235
236static inline bool mptcp_established_options(struct sock *sk,
237 struct sk_buff *skb,
238 unsigned int *size,
239 unsigned int remaining,
240 struct mptcp_out_options *opts)
241{
242 return false;
243}
244
245static inline bool mptcp_incoming_options(struct sock *sk,
246 struct sk_buff *skb)
247{
248 return true;
249}
250
251static inline void mptcp_skb_ext_move(struct sk_buff *to,
252 const struct sk_buff *from)
253{
254}
255
256static inline void mptcp_skb_ext_copy(struct sk_buff *to,
257 struct sk_buff *from)
258{
259}
260
261static inline bool mptcp_skb_can_collapse(const struct sk_buff *to,
262 const struct sk_buff *from)
263{
264 return true;
265}
266
267static inline void mptcp_space(const struct sock *ssk, int *s, int *fs) { }
268static inline void mptcp_seq_show(struct seq_file *seq) { }
269
270static inline int mptcp_subflow_init_cookie_req(struct request_sock *req,
271 const struct sock *sk_listener,
272 struct sk_buff *skb)
273{
274 return 0;
275}
276
277static inline __be32 mptcp_reset_option(const struct sk_buff *skb) { return htonl(0u); }
278#endif
279
280#if IS_ENABLED(CONFIG_MPTCP_IPV6)
281int mptcpv6_init(void);
282void mptcpv6_handle_mapped(struct sock *sk, bool mapped);
283#elif IS_ENABLED(CONFIG_IPV6)
284static inline int mptcpv6_init(void) { return 0; }
285static inline void mptcpv6_handle_mapped(struct sock *sk, bool mapped) { }
286#endif
287
288#endif
289
