1 /* SPDX-License-Identifier: GPL-2.0 */
5 * Copyright (c) 2017 - 2019, Intel Corporation.
11 #include <linux/skbuff.h>
12 #include <linux/tcp.h>
13 #include <linux/types.h>
17 /* MPTCP sk_buff extension data */
36 struct mptcp_out_options
{
37 #if IS_ENABLED(CONFIG_MPTCP)
43 #if IS_ENABLED(CONFIG_MPTCP_IPV6)
44 struct in6_addr addr6
;
56 struct mptcp_ext ext_copy
;
61 extern struct request_sock_ops mptcp_subflow_request_sock_ops
;
63 void mptcp_init(void);
65 static inline bool sk_is_mptcp(const struct sock
*sk
)
67 return tcp_sk(sk
)->is_mptcp
;
70 static inline bool rsk_is_mptcp(const struct request_sock
*req
)
72 return tcp_rsk(req
)->is_mptcp
;
75 static inline bool rsk_drop_req(const struct request_sock
*req
)
77 return tcp_rsk(req
)->is_mptcp
&& tcp_rsk(req
)->drop_req
;
80 void mptcp_space(const struct sock
*ssk
, int *space
, int *full_space
);
81 bool mptcp_syn_options(struct sock
*sk
, const struct sk_buff
*skb
,
82 unsigned int *size
, struct mptcp_out_options
*opts
);
83 bool mptcp_synack_options(const struct request_sock
*req
, unsigned int *size
,
84 struct mptcp_out_options
*opts
);
85 bool mptcp_established_options(struct sock
*sk
, struct sk_buff
*skb
,
86 unsigned int *size
, unsigned int remaining
,
87 struct mptcp_out_options
*opts
);
88 void mptcp_incoming_options(struct sock
*sk
, struct sk_buff
*skb
,
89 struct tcp_options_received
*opt_rx
);
91 void mptcp_write_options(__be32
*ptr
, struct mptcp_out_options
*opts
);
93 /* move the skb extension owership, with the assumption that 'to' is
96 static inline void mptcp_skb_ext_move(struct sk_buff
*to
,
99 if (!skb_ext_exist(from
, SKB_EXT_MPTCP
))
102 if (WARN_ON_ONCE(to
->active_extensions
))
105 to
->active_extensions
= from
->active_extensions
;
106 to
->extensions
= from
->extensions
;
107 from
->active_extensions
= 0;
110 static inline bool mptcp_ext_matches(const struct mptcp_ext
*to_ext
,
111 const struct mptcp_ext
*from_ext
)
113 /* MPTCP always clears the ext when adding it to the skb, so
114 * holes do not bother us here
117 (to_ext
&& from_ext
&&
118 !memcmp(from_ext
, to_ext
, sizeof(struct mptcp_ext
)));
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.
126 static inline bool mptcp_skb_can_collapse(const struct sk_buff
*to
,
127 const struct sk_buff
*from
)
129 return mptcp_ext_matches(skb_ext_find(to
, SKB_EXT_MPTCP
),
130 skb_ext_find(from
, SKB_EXT_MPTCP
));
133 void mptcp_seq_show(struct seq_file
*seq
);
134 int mptcp_subflow_init_cookie_req(struct request_sock
*req
,
135 const struct sock
*sk_listener
,
136 struct sk_buff
*skb
);
139 static inline void mptcp_init(void)
143 static inline bool sk_is_mptcp(const struct sock
*sk
)
148 static inline bool rsk_is_mptcp(const struct request_sock
*req
)
153 static inline bool rsk_drop_req(const struct request_sock
*req
)
158 static inline void mptcp_parse_option(const struct sk_buff
*skb
,
159 const unsigned char *ptr
, int opsize
,
160 struct tcp_options_received
*opt_rx
)
164 static inline bool mptcp_syn_options(struct sock
*sk
, const struct sk_buff
*skb
,
166 struct mptcp_out_options
*opts
)
171 static inline bool mptcp_synack_options(const struct request_sock
*req
,
173 struct mptcp_out_options
*opts
)
178 static inline bool mptcp_established_options(struct sock
*sk
,
181 unsigned int remaining
,
182 struct mptcp_out_options
*opts
)
187 static inline void mptcp_incoming_options(struct sock
*sk
,
189 struct tcp_options_received
*opt_rx
)
193 static inline void mptcp_skb_ext_move(struct sk_buff
*to
,
194 const struct sk_buff
*from
)
198 static inline bool mptcp_skb_can_collapse(const struct sk_buff
*to
,
199 const struct sk_buff
*from
)
204 static inline void mptcp_space(const struct sock
*ssk
, int *s
, int *fs
) { }
205 static inline void mptcp_seq_show(struct seq_file
*seq
) { }
207 static inline int mptcp_subflow_init_cookie_req(struct request_sock
*req
,
208 const struct sock
*sk_listener
,
211 return 0; /* TCP fallback */
213 #endif /* CONFIG_MPTCP */
215 #if IS_ENABLED(CONFIG_MPTCP_IPV6)
216 int mptcpv6_init(void);
217 void mptcpv6_handle_mapped(struct sock
*sk
, bool mapped
);
218 #elif IS_ENABLED(CONFIG_IPV6)
219 static inline int mptcpv6_init(void) { return 0; }
220 static inline void mptcpv6_handle_mapped(struct sock
*sk
, bool mapped
) { }
223 #endif /* __NET_MPTCP_H */