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 */
37 struct mptcp_out_options
{
38 #if IS_ENABLED(CONFIG_MPTCP)
44 #if IS_ENABLED(CONFIG_MPTCP_IPV6)
45 struct in6_addr addr6
;
58 struct mptcp_ext ext_copy
;
63 extern struct request_sock_ops mptcp_subflow_request_sock_ops
;
65 void mptcp_init(void);
67 static inline bool sk_is_mptcp(const struct sock
*sk
)
69 return tcp_sk(sk
)->is_mptcp
;
72 static inline bool rsk_is_mptcp(const struct request_sock
*req
)
74 return tcp_rsk(req
)->is_mptcp
;
77 static inline bool rsk_drop_req(const struct request_sock
*req
)
79 return tcp_rsk(req
)->is_mptcp
&& tcp_rsk(req
)->drop_req
;
82 void mptcp_space(const struct sock
*ssk
, int *space
, int *full_space
);
83 bool mptcp_syn_options(struct sock
*sk
, const struct sk_buff
*skb
,
84 unsigned int *size
, struct mptcp_out_options
*opts
);
85 bool mptcp_synack_options(const struct request_sock
*req
, unsigned int *size
,
86 struct mptcp_out_options
*opts
);
87 bool mptcp_established_options(struct sock
*sk
, struct sk_buff
*skb
,
88 unsigned int *size
, unsigned int remaining
,
89 struct mptcp_out_options
*opts
);
90 void mptcp_incoming_options(struct sock
*sk
, struct sk_buff
*skb
);
92 void mptcp_write_options(__be32
*ptr
, const struct tcp_sock
*tp
,
93 struct mptcp_out_options
*opts
);
95 /* move the skb extension owership, with the assumption that 'to' is
98 static inline void mptcp_skb_ext_move(struct sk_buff
*to
,
101 if (!skb_ext_exist(from
, SKB_EXT_MPTCP
))
104 if (WARN_ON_ONCE(to
->active_extensions
))
107 to
->active_extensions
= from
->active_extensions
;
108 to
->extensions
= from
->extensions
;
109 from
->active_extensions
= 0;
112 static inline void mptcp_skb_ext_copy(struct sk_buff
*to
,
113 struct sk_buff
*from
)
115 struct mptcp_ext
*from_ext
;
117 from_ext
= skb_ext_find(from
, SKB_EXT_MPTCP
);
121 from_ext
->frozen
= 1;
122 skb_ext_copy(to
, from
);
125 static inline bool mptcp_ext_matches(const struct mptcp_ext
*to_ext
,
126 const struct mptcp_ext
*from_ext
)
128 /* MPTCP always clears the ext when adding it to the skb, so
129 * holes do not bother us here
132 (to_ext
&& from_ext
&&
133 !memcmp(from_ext
, to_ext
, sizeof(struct mptcp_ext
)));
136 /* check if skbs can be collapsed.
137 * MPTCP collapse is allowed if neither @to or @from carry an mptcp data
138 * mapping, or if the extension of @to is the same as @from.
139 * Collapsing is not possible if @to lacks an extension, but @from carries one.
141 static inline bool mptcp_skb_can_collapse(const struct sk_buff
*to
,
142 const struct sk_buff
*from
)
144 return mptcp_ext_matches(skb_ext_find(to
, SKB_EXT_MPTCP
),
145 skb_ext_find(from
, SKB_EXT_MPTCP
));
148 void mptcp_seq_show(struct seq_file
*seq
);
149 int mptcp_subflow_init_cookie_req(struct request_sock
*req
,
150 const struct sock
*sk_listener
,
151 struct sk_buff
*skb
);
154 static inline void mptcp_init(void)
158 static inline bool sk_is_mptcp(const struct sock
*sk
)
163 static inline bool rsk_is_mptcp(const struct request_sock
*req
)
168 static inline bool rsk_drop_req(const struct request_sock
*req
)
173 static inline void mptcp_parse_option(const struct sk_buff
*skb
,
174 const unsigned char *ptr
, int opsize
,
175 struct tcp_options_received
*opt_rx
)
179 static inline bool mptcp_syn_options(struct sock
*sk
, const struct sk_buff
*skb
,
181 struct mptcp_out_options
*opts
)
186 static inline bool mptcp_synack_options(const struct request_sock
*req
,
188 struct mptcp_out_options
*opts
)
193 static inline bool mptcp_established_options(struct sock
*sk
,
196 unsigned int remaining
,
197 struct mptcp_out_options
*opts
)
202 static inline void mptcp_incoming_options(struct sock
*sk
,
207 static inline void mptcp_skb_ext_move(struct sk_buff
*to
,
208 const struct sk_buff
*from
)
212 static inline void mptcp_skb_ext_copy(struct sk_buff
*to
,
213 struct sk_buff
*from
)
217 static inline bool mptcp_skb_can_collapse(const struct sk_buff
*to
,
218 const struct sk_buff
*from
)
223 static inline void mptcp_space(const struct sock
*ssk
, int *s
, int *fs
) { }
224 static inline void mptcp_seq_show(struct seq_file
*seq
) { }
226 static inline int mptcp_subflow_init_cookie_req(struct request_sock
*req
,
227 const struct sock
*sk_listener
,
230 return 0; /* TCP fallback */
232 #endif /* CONFIG_MPTCP */
234 #if IS_ENABLED(CONFIG_MPTCP_IPV6)
235 int mptcpv6_init(void);
236 void mptcpv6_handle_mapped(struct sock
*sk
, bool mapped
);
237 #elif IS_ENABLED(CONFIG_IPV6)
238 static inline int mptcpv6_init(void) { return 0; }
239 static inline void mptcpv6_handle_mapped(struct sock
*sk
, bool mapped
) { }
242 #endif /* __NET_MPTCP_H */