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 */
33 struct mptcp_out_options
{
34 #if IS_ENABLED(CONFIG_MPTCP)
40 #if IS_ENABLED(CONFIG_MPTCP_IPV6)
41 struct in6_addr addr6
;
53 struct mptcp_ext ext_copy
;
59 void mptcp_init(void);
61 static inline bool sk_is_mptcp(const struct sock
*sk
)
63 return tcp_sk(sk
)->is_mptcp
;
66 static inline bool rsk_is_mptcp(const struct request_sock
*req
)
68 return tcp_rsk(req
)->is_mptcp
;
71 bool mptcp_syn_options(struct sock
*sk
, const struct sk_buff
*skb
,
72 unsigned int *size
, struct mptcp_out_options
*opts
);
73 bool mptcp_synack_options(const struct request_sock
*req
, unsigned int *size
,
74 struct mptcp_out_options
*opts
);
75 bool mptcp_established_options(struct sock
*sk
, struct sk_buff
*skb
,
76 unsigned int *size
, unsigned int remaining
,
77 struct mptcp_out_options
*opts
);
78 void mptcp_incoming_options(struct sock
*sk
, struct sk_buff
*skb
,
79 struct tcp_options_received
*opt_rx
);
81 void mptcp_write_options(__be32
*ptr
, struct mptcp_out_options
*opts
);
83 /* move the skb extension owership, with the assumption that 'to' is
86 static inline void mptcp_skb_ext_move(struct sk_buff
*to
,
89 if (!skb_ext_exist(from
, SKB_EXT_MPTCP
))
92 if (WARN_ON_ONCE(to
->active_extensions
))
95 to
->active_extensions
= from
->active_extensions
;
96 to
->extensions
= from
->extensions
;
97 from
->active_extensions
= 0;
100 static inline bool mptcp_ext_matches(const struct mptcp_ext
*to_ext
,
101 const struct mptcp_ext
*from_ext
)
103 /* MPTCP always clears the ext when adding it to the skb, so
104 * holes do not bother us here
107 (to_ext
&& from_ext
&&
108 !memcmp(from_ext
, to_ext
, sizeof(struct mptcp_ext
)));
111 /* check if skbs can be collapsed.
112 * MPTCP collapse is allowed if neither @to or @from carry an mptcp data
113 * mapping, or if the extension of @to is the same as @from.
114 * Collapsing is not possible if @to lacks an extension, but @from carries one.
116 static inline bool mptcp_skb_can_collapse(const struct sk_buff
*to
,
117 const struct sk_buff
*from
)
119 return mptcp_ext_matches(skb_ext_find(to
, SKB_EXT_MPTCP
),
120 skb_ext_find(from
, SKB_EXT_MPTCP
));
123 bool mptcp_sk_is_subflow(const struct sock
*sk
);
125 void mptcp_seq_show(struct seq_file
*seq
);
128 static inline void mptcp_init(void)
132 static inline bool sk_is_mptcp(const struct sock
*sk
)
137 static inline bool rsk_is_mptcp(const struct request_sock
*req
)
142 static inline void mptcp_parse_option(const struct sk_buff
*skb
,
143 const unsigned char *ptr
, int opsize
,
144 struct tcp_options_received
*opt_rx
)
148 static inline bool mptcp_syn_options(struct sock
*sk
, const struct sk_buff
*skb
,
150 struct mptcp_out_options
*opts
)
155 static inline void mptcp_rcv_synsent(struct sock
*sk
)
159 static inline bool mptcp_synack_options(const struct request_sock
*req
,
161 struct mptcp_out_options
*opts
)
166 static inline bool mptcp_established_options(struct sock
*sk
,
169 unsigned int remaining
,
170 struct mptcp_out_options
*opts
)
175 static inline void mptcp_incoming_options(struct sock
*sk
,
177 struct tcp_options_received
*opt_rx
)
181 static inline void mptcp_skb_ext_move(struct sk_buff
*to
,
182 const struct sk_buff
*from
)
186 static inline bool mptcp_skb_can_collapse(const struct sk_buff
*to
,
187 const struct sk_buff
*from
)
192 static inline bool mptcp_sk_is_subflow(const struct sock
*sk
)
197 static inline void mptcp_seq_show(struct seq_file
*seq
) { }
198 #endif /* CONFIG_MPTCP */
200 #if IS_ENABLED(CONFIG_MPTCP_IPV6)
201 int mptcpv6_init(void);
202 void mptcpv6_handle_mapped(struct sock
*sk
, bool mapped
);
203 #elif IS_ENABLED(CONFIG_IPV6)
204 static inline int mptcpv6_init(void) { return 0; }
205 static inline void mptcpv6_handle_mapped(struct sock
*sk
, bool mapped
) { }
208 #endif /* __NET_MPTCP_H */