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 */
39 #define MPTCP_RM_IDS_MAX 8
41 struct mptcp_rm_list {
42 u8 ids[MPTCP_RM_IDS_MAX];
46 struct mptcp_addr_info {
52 #if IS_ENABLED(CONFIG_MPTCP_IPV6)
53 struct in6_addr addr6;
58 struct mptcp_out_options {
59 #if IS_ENABLED(CONFIG_MPTCP)
61 struct mptcp_rm_list rm_list;
74 struct mptcp_addr_info addr;
78 struct mptcp_ext ext_copy;
92 extern struct request_sock_ops mptcp_subflow_request_sock_ops;
94 void mptcp_init(void);
96 static inline bool sk_is_mptcp(const struct sock *sk)
98 return tcp_sk(sk)->is_mptcp;
101 static inline bool rsk_is_mptcp(const struct request_sock *req)
103 return tcp_rsk(req)->is_mptcp;
106 static inline bool rsk_drop_req(const struct request_sock *req)
108 return tcp_rsk(req)->is_mptcp && tcp_rsk(req)->drop_req;
111 void mptcp_space(const struct sock *ssk, int *space, int *full_space);
112 bool mptcp_syn_options(struct sock *sk, const struct sk_buff *skb,
113 unsigned int *size, struct mptcp_out_options *opts);
114 bool mptcp_synack_options(const struct request_sock *req, unsigned int *size,
115 struct mptcp_out_options *opts);
116 bool mptcp_established_options(struct sock *sk, struct sk_buff *skb,
117 unsigned int *size, unsigned int remaining,
118 struct mptcp_out_options *opts);
119 bool mptcp_incoming_options(struct sock *sk, struct sk_buff *skb);
121 void mptcp_write_options(__be32 *ptr, const struct tcp_sock *tp,
122 struct mptcp_out_options *opts);
124 /* move the skb extension owership, with the assumption that 'to' is
127 static inline void mptcp_skb_ext_move(struct sk_buff *to,
128 struct sk_buff *from)
130 if (!skb_ext_exist(from, SKB_EXT_MPTCP))
133 if (WARN_ON_ONCE(to->active_extensions))
136 to->active_extensions = from->active_extensions;
137 to->extensions = from->extensions;
138 from->active_extensions = 0;
141 static inline void mptcp_skb_ext_copy(struct sk_buff *to,
142 struct sk_buff *from)
144 struct mptcp_ext *from_ext;
146 from_ext = skb_ext_find(from, SKB_EXT_MPTCP);
150 from_ext->frozen = 1;
151 skb_ext_copy(to, from);
154 static inline bool mptcp_ext_matches(const struct mptcp_ext *to_ext,
155 const struct mptcp_ext *from_ext)
157 /* MPTCP always clears the ext when adding it to the skb, so
158 * holes do not bother us here
161 (to_ext && from_ext &&
162 !memcmp(from_ext, to_ext, sizeof(struct mptcp_ext)));
165 /* check if skbs can be collapsed.
166 * MPTCP collapse is allowed if neither @to or @from carry an mptcp data
167 * mapping, or if the extension of @to is the same as @from.
168 * Collapsing is not possible if @to lacks an extension, but @from carries one.
170 static inline bool mptcp_skb_can_collapse(const struct sk_buff *to,
171 const struct sk_buff *from)
173 return mptcp_ext_matches(skb_ext_find(to, SKB_EXT_MPTCP),
174 skb_ext_find(from, SKB_EXT_MPTCP));
177 void mptcp_seq_show(struct seq_file *seq);
178 int mptcp_subflow_init_cookie_req(struct request_sock *req,
179 const struct sock *sk_listener,
180 struct sk_buff *skb);
182 __be32 mptcp_get_reset_option(const struct sk_buff *skb);
184 static inline __be32 mptcp_reset_option(const struct sk_buff *skb)
186 if (skb_ext_exist(skb, SKB_EXT_MPTCP))
187 return mptcp_get_reset_option(skb);
193 static inline void mptcp_init(void)
197 static inline bool sk_is_mptcp(const struct sock *sk)
202 static inline bool rsk_is_mptcp(const struct request_sock *req)
207 static inline bool rsk_drop_req(const struct request_sock *req)
212 static inline void mptcp_parse_option(const struct sk_buff *skb,
213 const unsigned char *ptr, int opsize,
214 struct tcp_options_received *opt_rx)
218 static inline bool mptcp_syn_options(struct sock *sk, const struct sk_buff *skb,
220 struct mptcp_out_options *opts)
225 static inline bool mptcp_synack_options(const struct request_sock *req,
227 struct mptcp_out_options *opts)
232 static inline bool mptcp_established_options(struct sock *sk,
235 unsigned int remaining,
236 struct mptcp_out_options *opts)
241 static inline bool mptcp_incoming_options(struct sock *sk,
247 static inline void mptcp_skb_ext_move(struct sk_buff *to,
248 const struct sk_buff *from)
252 static inline void mptcp_skb_ext_copy(struct sk_buff *to,
253 struct sk_buff *from)
257 static inline bool mptcp_skb_can_collapse(const struct sk_buff *to,
258 const struct sk_buff *from)
263 static inline void mptcp_space(const struct sock *ssk, int *s, int *fs) { }
264 static inline void mptcp_seq_show(struct seq_file *seq) { }
266 static inline int mptcp_subflow_init_cookie_req(struct request_sock *req,
267 const struct sock *sk_listener,
270 return 0; /* TCP fallback */
273 static inline __be32 mptcp_reset_option(const struct sk_buff *skb) { return htonl(0u); }
274 #endif /* CONFIG_MPTCP */
276 #if IS_ENABLED(CONFIG_MPTCP_IPV6)
277 int mptcpv6_init(void);
278 void mptcpv6_handle_mapped(struct sock *sk, bool mapped);
279 #elif IS_ENABLED(CONFIG_IPV6)
280 static inline int mptcpv6_init(void) { return 0; }
281 static inline void mptcpv6_handle_mapped(struct sock *sk, bool mapped) { }
284 #endif /* __NET_MPTCP_H */