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 void mptcp_init(void);
63 static inline bool sk_is_mptcp(const struct sock *sk)
65 return tcp_sk(sk)->is_mptcp;
68 static inline bool rsk_is_mptcp(const struct request_sock *req)
70 return tcp_rsk(req)->is_mptcp;
73 static inline bool rsk_drop_req(const struct request_sock *req)
75 return tcp_rsk(req)->is_mptcp && tcp_rsk(req)->drop_req;
78 void mptcp_space(const struct sock *ssk, int *space, int *full_space);
79 bool mptcp_syn_options(struct sock *sk, const struct sk_buff *skb,
80 unsigned int *size, struct mptcp_out_options *opts);
81 bool mptcp_synack_options(const struct request_sock *req, unsigned int *size,
82 struct mptcp_out_options *opts);
83 bool mptcp_established_options(struct sock *sk, struct sk_buff *skb,
84 unsigned int *size, unsigned int remaining,
85 struct mptcp_out_options *opts);
86 void mptcp_incoming_options(struct sock *sk, struct sk_buff *skb);
88 void mptcp_write_options(__be32 *ptr, struct mptcp_out_options *opts);
90 /* move the skb extension owership, with the assumption that 'to' is
93 static inline void mptcp_skb_ext_move(struct sk_buff *to,
96 if (!skb_ext_exist(from, SKB_EXT_MPTCP))
99 if (WARN_ON_ONCE(to->active_extensions))
102 to->active_extensions = from->active_extensions;
103 to->extensions = from->extensions;
104 from->active_extensions = 0;
107 static inline bool mptcp_ext_matches(const struct mptcp_ext *to_ext,
108 const struct mptcp_ext *from_ext)
110 /* MPTCP always clears the ext when adding it to the skb, so
111 * holes do not bother us here
114 (to_ext && from_ext &&
115 !memcmp(from_ext, to_ext, sizeof(struct mptcp_ext)));
118 /* check if skbs can be collapsed.
119 * MPTCP collapse is allowed if neither @to or @from carry an mptcp data
120 * mapping, or if the extension of @to is the same as @from.
121 * Collapsing is not possible if @to lacks an extension, but @from carries one.
123 static inline bool mptcp_skb_can_collapse(const struct sk_buff *to,
124 const struct sk_buff *from)
126 return mptcp_ext_matches(skb_ext_find(to, SKB_EXT_MPTCP),
127 skb_ext_find(from, SKB_EXT_MPTCP));
130 void mptcp_seq_show(struct seq_file *seq);
131 int mptcp_subflow_init_cookie_req(struct request_sock *req,
132 const struct sock *sk_listener,
133 struct sk_buff *skb);
134 struct request_sock *mptcp_subflow_reqsk_alloc(const struct request_sock_ops *ops,
135 struct sock *sk_listener,
136 bool attach_listener);
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,
192 static inline void mptcp_skb_ext_move(struct sk_buff *to,
193 const struct sk_buff *from)
197 static inline bool mptcp_skb_can_collapse(const struct sk_buff *to,
198 const struct sk_buff *from)
203 static inline void mptcp_space(const struct sock *ssk, int *s, int *fs) { }
204 static inline void mptcp_seq_show(struct seq_file *seq) { }
206 static inline int mptcp_subflow_init_cookie_req(struct request_sock *req,
207 const struct sock *sk_listener,
210 return 0; /* TCP fallback */
213 static inline struct request_sock *mptcp_subflow_reqsk_alloc(const struct request_sock_ops *ops,
214 struct sock *sk_listener,
215 bool attach_listener)
219 #endif /* CONFIG_MPTCP */
221 #if IS_ENABLED(CONFIG_MPTCP_IPV6)
222 int mptcpv6_init(void);
223 void mptcpv6_handle_mapped(struct sock *sk, bool mapped);
224 #elif IS_ENABLED(CONFIG_IPV6)
225 static inline int mptcpv6_init(void) { return 0; }
226 static inline void mptcpv6_handle_mapped(struct sock *sk, bool mapped) { }
229 #endif /* __NET_MPTCP_H */