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>
19 /* MPTCP sk_buff extension data */
41 #define MPTCP_RM_IDS_MAX 8
43 struct mptcp_rm_list {
44 u8 ids[MPTCP_RM_IDS_MAX];
48 struct mptcp_addr_info {
54 #if IS_ENABLED(CONFIG_MPTCP_IPV6)
55 struct in6_addr addr6;
60 struct mptcp_out_options {
61 #if IS_ENABLED(CONFIG_MPTCP)
63 struct mptcp_rm_list rm_list;
80 struct mptcp_addr_info addr;
84 struct mptcp_ext ext_copy;
98 extern struct request_sock_ops mptcp_subflow_request_sock_ops;
100 void mptcp_init(void);
102 static inline bool sk_is_mptcp(const struct sock *sk)
104 return tcp_sk(sk)->is_mptcp;
107 static inline bool rsk_is_mptcp(const struct request_sock *req)
109 return tcp_rsk(req)->is_mptcp;
112 static inline bool rsk_drop_req(const struct request_sock *req)
114 return tcp_rsk(req)->is_mptcp && tcp_rsk(req)->drop_req;
117 void mptcp_space(const struct sock *ssk, int *space, int *full_space);
118 bool mptcp_syn_options(struct sock *sk, const struct sk_buff *skb,
119 unsigned int *size, struct mptcp_out_options *opts);
120 bool mptcp_synack_options(const struct request_sock *req, unsigned int *size,
121 struct mptcp_out_options *opts);
122 bool mptcp_established_options(struct sock *sk, struct sk_buff *skb,
123 unsigned int *size, unsigned int remaining,
124 struct mptcp_out_options *opts);
125 bool mptcp_incoming_options(struct sock *sk, struct sk_buff *skb);
127 void mptcp_write_options(__be32 *ptr, const struct tcp_sock *tp,
128 struct mptcp_out_options *opts);
130 void mptcp_diag_fill_info(struct mptcp_sock *msk, struct mptcp_info *info);
132 /* move the skb extension owership, with the assumption that 'to' is
135 static inline void mptcp_skb_ext_move(struct sk_buff *to,
136 struct sk_buff *from)
138 if (!skb_ext_exist(from, SKB_EXT_MPTCP))
141 if (WARN_ON_ONCE(to->active_extensions))
144 to->active_extensions = from->active_extensions;
145 to->extensions = from->extensions;
146 from->active_extensions = 0;
149 static inline void mptcp_skb_ext_copy(struct sk_buff *to,
150 struct sk_buff *from)
152 struct mptcp_ext *from_ext;
154 from_ext = skb_ext_find(from, SKB_EXT_MPTCP);
158 from_ext->frozen = 1;
159 skb_ext_copy(to, from);
162 static inline bool mptcp_ext_matches(const struct mptcp_ext *to_ext,
163 const struct mptcp_ext *from_ext)
165 /* MPTCP always clears the ext when adding it to the skb, so
166 * holes do not bother us here
169 (to_ext && from_ext &&
170 !memcmp(from_ext, to_ext, sizeof(struct mptcp_ext)));
173 /* check if skbs can be collapsed.
174 * MPTCP collapse is allowed if neither @to or @from carry an mptcp data
175 * mapping, or if the extension of @to is the same as @from.
176 * Collapsing is not possible if @to lacks an extension, but @from carries one.
178 static inline bool mptcp_skb_can_collapse(const struct sk_buff *to,
179 const struct sk_buff *from)
181 return mptcp_ext_matches(skb_ext_find(to, SKB_EXT_MPTCP),
182 skb_ext_find(from, SKB_EXT_MPTCP));
185 void mptcp_seq_show(struct seq_file *seq);
186 int mptcp_subflow_init_cookie_req(struct request_sock *req,
187 const struct sock *sk_listener,
188 struct sk_buff *skb);
190 __be32 mptcp_get_reset_option(const struct sk_buff *skb);
192 static inline __be32 mptcp_reset_option(const struct sk_buff *skb)
194 if (skb_ext_exist(skb, SKB_EXT_MPTCP))
195 return mptcp_get_reset_option(skb);
201 static inline void mptcp_init(void)
205 static inline bool sk_is_mptcp(const struct sock *sk)
210 static inline bool rsk_is_mptcp(const struct request_sock *req)
215 static inline bool rsk_drop_req(const struct request_sock *req)
220 static inline void mptcp_parse_option(const struct sk_buff *skb,
221 const unsigned char *ptr, int opsize,
222 struct tcp_options_received *opt_rx)
226 static inline bool mptcp_syn_options(struct sock *sk, const struct sk_buff *skb,
228 struct mptcp_out_options *opts)
233 static inline bool mptcp_synack_options(const struct request_sock *req,
235 struct mptcp_out_options *opts)
240 static inline bool mptcp_established_options(struct sock *sk,
243 unsigned int remaining,
244 struct mptcp_out_options *opts)
249 static inline bool mptcp_incoming_options(struct sock *sk,
255 static inline void mptcp_skb_ext_move(struct sk_buff *to,
256 const struct sk_buff *from)
260 static inline void mptcp_skb_ext_copy(struct sk_buff *to,
261 struct sk_buff *from)
265 static inline bool mptcp_skb_can_collapse(const struct sk_buff *to,
266 const struct sk_buff *from)
271 static inline void mptcp_space(const struct sock *ssk, int *s, int *fs) { }
272 static inline void mptcp_seq_show(struct seq_file *seq) { }
274 static inline int mptcp_subflow_init_cookie_req(struct request_sock *req,
275 const struct sock *sk_listener,
278 return 0; /* TCP fallback */
281 static inline __be32 mptcp_reset_option(const struct sk_buff *skb) { return htonl(0u); }
282 #endif /* CONFIG_MPTCP */
284 #if IS_ENABLED(CONFIG_MPTCP_IPV6)
285 int mptcpv6_init(void);
286 void mptcpv6_handle_mapped(struct sock *sk, bool mapped);
287 #elif IS_ENABLED(CONFIG_IPV6)
288 static inline int mptcpv6_init(void) { return 0; }
289 static inline void mptcpv6_handle_mapped(struct sock *sk, bool mapped) { }
292 #endif /* __NET_MPTCP_H */