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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
11#include <linux/skbuff.h>
12#include <linux/tcp.h>
13#include <linux/types.h>
14
15struct seq_file;
16
17/* MPTCP sk_buff extension data */
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 u8 use_map:1,
27 dsn64:1,
28 data_fin:1,
29 use_ack:1,
30 ack64:1,
31 mpc_map:1,
32 __unused:2;
33 /* one byte hole */
34};
35
36struct mptcp_out_options {
37#if IS_ENABLED(CONFIG_MPTCP)
38 u16 suboptions;
39 u64 sndr_key;
40 u64 rcvr_key;
41 union {
42 struct in_addr addr;
43#if IS_ENABLED(CONFIG_MPTCP_IPV6)
44 struct in6_addr addr6;
45#endif
46 };
47 u8 addr_id;
48 u64 ahmac;
49 u8 rm_id;
50 u8 join_id;
51 u8 backup;
52 u32 nonce;
53 u64 thmac;
54 u32 token;
55 u8 hmac[20];
56 struct mptcp_ext ext_copy;
57#endif
58};
59
60#ifdef CONFIG_MPTCP
61extern struct request_sock_ops mptcp_subflow_request_sock_ops;
62
63void mptcp_init(void);
64
65static inline bool sk_is_mptcp(const struct sock *sk)
66{
67 return tcp_sk(sk)->is_mptcp;
68}
69
70static inline bool rsk_is_mptcp(const struct request_sock *req)
71{
72 return tcp_rsk(req)->is_mptcp;
73}
74
75static inline bool rsk_drop_req(const struct request_sock *req)
76{
77 return tcp_rsk(req)->is_mptcp && tcp_rsk(req)->drop_req;
78}
79
80void mptcp_space(const struct sock *ssk, int *space, int *full_space);
81bool mptcp_syn_options(struct sock *sk, const struct sk_buff *skb,
82 unsigned int *size, struct mptcp_out_options *opts);
83bool mptcp_synack_options(const struct request_sock *req, unsigned int *size,
84 struct mptcp_out_options *opts);
85bool mptcp_established_options(struct sock *sk, struct sk_buff *skb,
86 unsigned int *size, unsigned int remaining,
87 struct mptcp_out_options *opts);
88void mptcp_incoming_options(struct sock *sk, struct sk_buff *skb,
89 struct tcp_options_received *opt_rx);
90
91void mptcp_write_options(__be32 *ptr, struct mptcp_out_options *opts);
92
93/* move the skb extension owership, with the assumption that 'to' is
94 * newly allocated
95 */
96static inline void mptcp_skb_ext_move(struct sk_buff *to,
97 struct sk_buff *from)
98{
99 if (!skb_ext_exist(from, SKB_EXT_MPTCP))
100 return;
101
102 if (WARN_ON_ONCE(to->active_extensions))
103 skb_ext_put(to);
104
105 to->active_extensions = from->active_extensions;
106 to->extensions = from->extensions;
107 from->active_extensions = 0;
108}
109
110static inline bool mptcp_ext_matches(const struct mptcp_ext *to_ext,
111 const struct mptcp_ext *from_ext)
112{
113 /* MPTCP always clears the ext when adding it to the skb, so
114 * holes do not bother us here
115 */
116 return !from_ext ||
117 (to_ext && from_ext &&
118 !memcmp(from_ext, to_ext, sizeof(struct mptcp_ext)));
119}
120
121/* check if skbs can be collapsed.
122 * MPTCP collapse is allowed if neither @to or @from carry an mptcp data
123 * mapping, or if the extension of @to is the same as @from.
124 * Collapsing is not possible if @to lacks an extension, but @from carries one.
125 */
126static inline bool mptcp_skb_can_collapse(const struct sk_buff *to,
127 const struct sk_buff *from)
128{
129 return mptcp_ext_matches(skb_ext_find(to, SKB_EXT_MPTCP),
130 skb_ext_find(from, SKB_EXT_MPTCP));
131}
132
133void mptcp_seq_show(struct seq_file *seq);
134int mptcp_subflow_init_cookie_req(struct request_sock *req,
135 const struct sock *sk_listener,
136 struct sk_buff *skb);
137#else
138
139static inline void mptcp_init(void)
140{
141}
142
143static inline bool sk_is_mptcp(const struct sock *sk)
144{
145 return false;
146}
147
148static inline bool rsk_is_mptcp(const struct request_sock *req)
149{
150 return false;
151}
152
153static inline bool rsk_drop_req(const struct request_sock *req)
154{
155 return false;
156}
157
158static inline void mptcp_parse_option(const struct sk_buff *skb,
159 const unsigned char *ptr, int opsize,
160 struct tcp_options_received *opt_rx)
161{
162}
163
164static inline bool mptcp_syn_options(struct sock *sk, const struct sk_buff *skb,
165 unsigned int *size,
166 struct mptcp_out_options *opts)
167{
168 return false;
169}
170
171static inline bool mptcp_synack_options(const struct request_sock *req,
172 unsigned int *size,
173 struct mptcp_out_options *opts)
174{
175 return false;
176}
177
178static inline bool mptcp_established_options(struct sock *sk,
179 struct sk_buff *skb,
180 unsigned int *size,
181 unsigned int remaining,
182 struct mptcp_out_options *opts)
183{
184 return false;
185}
186
187static inline void mptcp_incoming_options(struct sock *sk,
188 struct sk_buff *skb,
189 struct tcp_options_received *opt_rx)
190{
191}
192
193static inline void mptcp_skb_ext_move(struct sk_buff *to,
194 const struct sk_buff *from)
195{
196}
197
198static inline bool mptcp_skb_can_collapse(const struct sk_buff *to,
199 const struct sk_buff *from)
200{
201 return true;
202}
203
204static inline void mptcp_space(const struct sock *ssk, int *s, int *fs) { }
205static inline void mptcp_seq_show(struct seq_file *seq) { }
206
207static inline int mptcp_subflow_init_cookie_req(struct request_sock *req,
208 const struct sock *sk_listener,
209 struct sk_buff *skb)
210{
211 return 0; /* TCP fallback */
212}
213#endif /* CONFIG_MPTCP */
214
215#if IS_ENABLED(CONFIG_MPTCP_IPV6)
216int mptcpv6_init(void);
217void mptcpv6_handle_mapped(struct sock *sk, bool mapped);
218#elif IS_ENABLED(CONFIG_IPV6)
219static inline int mptcpv6_init(void) { return 0; }
220static inline void mptcpv6_handle_mapped(struct sock *sk, bool mapped) { }
221#endif
222
223#endif /* __NET_MPTCP_H */
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
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/* MPTCP sk_buff extension data */
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 infinite_map:1;
40};
41
42#define MPTCPOPT_HMAC_LEN 20
43#define MPTCP_RM_IDS_MAX 8
44
45struct mptcp_rm_list {
46 u8 ids[MPTCP_RM_IDS_MAX];
47 u8 nr;
48};
49
50struct mptcp_addr_info {
51 u8 id;
52 sa_family_t family;
53 __be16 port;
54 union {
55 struct in_addr addr;
56#if IS_ENABLED(CONFIG_MPTCP_IPV6)
57 struct in6_addr addr6;
58#endif
59 };
60};
61
62struct mptcp_out_options {
63#if IS_ENABLED(CONFIG_MPTCP)
64 u16 suboptions;
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 union {
73 struct {
74 u64 sndr_key;
75 u64 rcvr_key;
76 u64 data_seq;
77 u32 subflow_seq;
78 u16 data_len;
79 __sum16 csum;
80 };
81 struct {
82 struct mptcp_addr_info addr;
83 u64 ahmac;
84 };
85 struct {
86 struct mptcp_ext ext_copy;
87 u64 fail_seq;
88 };
89 struct {
90 u32 nonce;
91 u32 token;
92 u64 thmac;
93 u8 hmac[MPTCPOPT_HMAC_LEN];
94 };
95 };
96#endif
97};
98
99#ifdef CONFIG_MPTCP
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(struct tcphdr *th, __be32 *ptr, 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/* move the skb extension owership, with the assumption that 'to' is
133 * newly allocated
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 /* MPTCP always clears the ext when adding it to the skb, so
166 * holes do not bother us here
167 */
168 return !from_ext ||
169 (to_ext && from_ext &&
170 !memcmp(from_ext, to_ext, sizeof(struct mptcp_ext)));
171}
172
173/* check if skbs can be collapsed.
174 * MPTCP collapse is allowed if neither @to or @from carry an mptcp data
175 * mapping, or if the extension of @to is the same as @from.
176 * Collapsing is not possible if @to lacks an extension, but @from carries one.
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);
189struct request_sock *mptcp_subflow_reqsk_alloc(const struct request_sock_ops *ops,
190 struct sock *sk_listener,
191 bool attach_listener);
192
193__be32 mptcp_get_reset_option(const struct sk_buff *skb);
194
195static inline __be32 mptcp_reset_option(const struct sk_buff *skb)
196{
197 if (skb_ext_exist(skb, SKB_EXT_MPTCP))
198 return mptcp_get_reset_option(skb);
199
200 return htonl(0u);
201}
202#else
203
204static inline void mptcp_init(void)
205{
206}
207
208static inline bool sk_is_mptcp(const struct sock *sk)
209{
210 return false;
211}
212
213static inline bool rsk_is_mptcp(const struct request_sock *req)
214{
215 return false;
216}
217
218static inline bool rsk_drop_req(const struct request_sock *req)
219{
220 return false;
221}
222
223static inline bool mptcp_syn_options(struct sock *sk, const struct sk_buff *skb,
224 unsigned int *size,
225 struct mptcp_out_options *opts)
226{
227 return false;
228}
229
230static inline bool mptcp_synack_options(const struct request_sock *req,
231 unsigned int *size,
232 struct mptcp_out_options *opts)
233{
234 return false;
235}
236
237static inline bool mptcp_established_options(struct sock *sk,
238 struct sk_buff *skb,
239 unsigned int *size,
240 unsigned int remaining,
241 struct mptcp_out_options *opts)
242{
243 return false;
244}
245
246static inline bool mptcp_incoming_options(struct sock *sk,
247 struct sk_buff *skb)
248{
249 return true;
250}
251
252static inline void mptcp_skb_ext_move(struct sk_buff *to,
253 const struct sk_buff *from)
254{
255}
256
257static inline void mptcp_skb_ext_copy(struct sk_buff *to,
258 struct sk_buff *from)
259{
260}
261
262static inline bool mptcp_skb_can_collapse(const struct sk_buff *to,
263 const struct sk_buff *from)
264{
265 return true;
266}
267
268static inline void mptcp_space(const struct sock *ssk, int *s, int *fs) { }
269static inline void mptcp_seq_show(struct seq_file *seq) { }
270
271static inline int mptcp_subflow_init_cookie_req(struct request_sock *req,
272 const struct sock *sk_listener,
273 struct sk_buff *skb)
274{
275 return 0; /* TCP fallback */
276}
277
278static inline struct request_sock *mptcp_subflow_reqsk_alloc(const struct request_sock_ops *ops,
279 struct sock *sk_listener,
280 bool attach_listener)
281{
282 return NULL;
283}
284
285static inline __be32 mptcp_reset_option(const struct sk_buff *skb) { return htonl(0u); }
286#endif /* CONFIG_MPTCP */
287
288#if IS_ENABLED(CONFIG_MPTCP_IPV6)
289int mptcpv6_init(void);
290void mptcpv6_handle_mapped(struct sock *sk, bool mapped);
291#elif IS_ENABLED(CONFIG_IPV6)
292static inline int mptcpv6_init(void) { return 0; }
293static inline void mptcpv6_handle_mapped(struct sock *sk, bool mapped) { }
294#endif
295
296#if defined(CONFIG_MPTCP) && defined(CONFIG_BPF_SYSCALL)
297struct mptcp_sock *bpf_mptcp_sock_from_subflow(struct sock *sk);
298#else
299static inline struct mptcp_sock *bpf_mptcp_sock_from_subflow(struct sock *sk) { return NULL; }
300#endif
301
302#if !IS_ENABLED(CONFIG_MPTCP)
303struct mptcp_sock { };
304#endif
305
306#endif /* __NET_MPTCP_H */