1
2
3
4
5
6
7
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 u64 sndr_key;
62 u64 rcvr_key;
63 u64 ahmac;
64 struct mptcp_addr_info addr;
65 struct mptcp_rm_list rm_list;
66 u8 join_id;
67 u8 backup;
68 u8 reset_reason:4,
69 reset_transient:1,
70 csum_reqd:1,
71 allow_join_id0:1;
72 u32 nonce;
73 u64 thmac;
74 u32 token;
75 u8 hmac[20];
76 struct mptcp_ext ext_copy;
77#endif
78};
79
80#ifdef CONFIG_MPTCP
81extern struct request_sock_ops mptcp_subflow_request_sock_ops;
82
83void mptcp_init(void);
84
85static inline bool sk_is_mptcp(const struct sock *sk)
86{
87 return tcp_sk(sk)->is_mptcp;
88}
89
90static inline bool rsk_is_mptcp(const struct request_sock *req)
91{
92 return tcp_rsk(req)->is_mptcp;
93}
94
95static inline bool rsk_drop_req(const struct request_sock *req)
96{
97 return tcp_rsk(req)->is_mptcp && tcp_rsk(req)->drop_req;
98}
99
100void mptcp_space(const struct sock *ssk, int *space, int *full_space);
101bool mptcp_syn_options(struct sock *sk, const struct sk_buff *skb,
102 unsigned int *size, struct mptcp_out_options *opts);
103bool mptcp_synack_options(const struct request_sock *req, unsigned int *size,
104 struct mptcp_out_options *opts);
105bool mptcp_established_options(struct sock *sk, struct sk_buff *skb,
106 unsigned int *size, unsigned int remaining,
107 struct mptcp_out_options *opts);
108bool mptcp_incoming_options(struct sock *sk, struct sk_buff *skb);
109
110void mptcp_write_options(__be32 *ptr, const struct tcp_sock *tp,
111 struct mptcp_out_options *opts);
112
113
114
115
116static inline void mptcp_skb_ext_move(struct sk_buff *to,
117 struct sk_buff *from)
118{
119 if (!skb_ext_exist(from, SKB_EXT_MPTCP))
120 return;
121
122 if (WARN_ON_ONCE(to->active_extensions))
123 skb_ext_put(to);
124
125 to->active_extensions = from->active_extensions;
126 to->extensions = from->extensions;
127 from->active_extensions = 0;
128}
129
130static inline void mptcp_skb_ext_copy(struct sk_buff *to,
131 struct sk_buff *from)
132{
133 struct mptcp_ext *from_ext;
134
135 from_ext = skb_ext_find(from, SKB_EXT_MPTCP);
136 if (!from_ext)
137 return;
138
139 from_ext->frozen = 1;
140 skb_ext_copy(to, from);
141}
142
143static inline bool mptcp_ext_matches(const struct mptcp_ext *to_ext,
144 const struct mptcp_ext *from_ext)
145{
146
147
148
149 return !from_ext ||
150 (to_ext && from_ext &&
151 !memcmp(from_ext, to_ext, sizeof(struct mptcp_ext)));
152}
153
154
155
156
157
158
159static inline bool mptcp_skb_can_collapse(const struct sk_buff *to,
160 const struct sk_buff *from)
161{
162 return mptcp_ext_matches(skb_ext_find(to, SKB_EXT_MPTCP),
163 skb_ext_find(from, SKB_EXT_MPTCP));
164}
165
166void mptcp_seq_show(struct seq_file *seq);
167int mptcp_subflow_init_cookie_req(struct request_sock *req,
168 const struct sock *sk_listener,
169 struct sk_buff *skb);
170
171__be32 mptcp_get_reset_option(const struct sk_buff *skb);
172
173static inline __be32 mptcp_reset_option(const struct sk_buff *skb)
174{
175 if (skb_ext_exist(skb, SKB_EXT_MPTCP))
176 return mptcp_get_reset_option(skb);
177
178 return htonl(0u);
179}
180#else
181
182static inline void mptcp_init(void)
183{
184}
185
186static inline bool sk_is_mptcp(const struct sock *sk)
187{
188 return false;
189}
190
191static inline bool rsk_is_mptcp(const struct request_sock *req)
192{
193 return false;
194}
195
196static inline bool rsk_drop_req(const struct request_sock *req)
197{
198 return false;
199}
200
201static inline void mptcp_parse_option(const struct sk_buff *skb,
202 const unsigned char *ptr, int opsize,
203 struct tcp_options_received *opt_rx)
204{
205}
206
207static inline bool mptcp_syn_options(struct sock *sk, const struct sk_buff *skb,
208 unsigned int *size,
209 struct mptcp_out_options *opts)
210{
211 return false;
212}
213
214static inline bool mptcp_synack_options(const struct request_sock *req,
215 unsigned int *size,
216 struct mptcp_out_options *opts)
217{
218 return false;
219}
220
221static inline bool mptcp_established_options(struct sock *sk,
222 struct sk_buff *skb,
223 unsigned int *size,
224 unsigned int remaining,
225 struct mptcp_out_options *opts)
226{
227 return false;
228}
229
230static inline bool mptcp_incoming_options(struct sock *sk,
231 struct sk_buff *skb)
232{
233 return true;
234}
235
236static inline void mptcp_skb_ext_move(struct sk_buff *to,
237 const struct sk_buff *from)
238{
239}
240
241static inline void mptcp_skb_ext_copy(struct sk_buff *to,
242 struct sk_buff *from)
243{
244}
245
246static inline bool mptcp_skb_can_collapse(const struct sk_buff *to,
247 const struct sk_buff *from)
248{
249 return true;
250}
251
252static inline void mptcp_space(const struct sock *ssk, int *s, int *fs) { }
253static inline void mptcp_seq_show(struct seq_file *seq) { }
254
255static inline int mptcp_subflow_init_cookie_req(struct request_sock *req,
256 const struct sock *sk_listener,
257 struct sk_buff *skb)
258{
259 return 0;
260}
261
262static inline __be32 mptcp_reset_option(const struct sk_buff *skb) { return htonl(0u); }
263#endif
264
265#if IS_ENABLED(CONFIG_MPTCP_IPV6)
266int mptcpv6_init(void);
267void mptcpv6_handle_mapped(struct sock *sk, bool mapped);
268#elif IS_ENABLED(CONFIG_IPV6)
269static inline int mptcpv6_init(void) { return 0; }
270static inline void mptcpv6_handle_mapped(struct sock *sk, bool mapped) { }
271#endif
272
273#endif
274
