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 */
42 #define MPTCPOPT_HMAC_LEN 20
43 #define MPTCP_RM_IDS_MAX 8
45 struct mptcp_rm_list {
46 u8 ids[MPTCP_RM_IDS_MAX];
50 struct mptcp_addr_info {
56 #if IS_ENABLED(CONFIG_MPTCP_IPV6)
57 struct in6_addr addr6;
62 struct mptcp_out_options {
63 #if IS_ENABLED(CONFIG_MPTCP)
65 struct mptcp_rm_list rm_list;
82 struct mptcp_addr_info addr;
86 struct mptcp_ext ext_copy;
93 u8 hmac[MPTCPOPT_HMAC_LEN];
99 #define MPTCP_SCHED_NAME_MAX 16
100 #define MPTCP_SCHED_MAX 128
101 #define MPTCP_SCHED_BUF_MAX (MPTCP_SCHED_NAME_MAX * MPTCP_SCHED_MAX)
103 #define MPTCP_SUBFLOWS_MAX 8
105 struct mptcp_sched_data {
108 struct mptcp_subflow_context *contexts[MPTCP_SUBFLOWS_MAX];
111 struct mptcp_sched_ops {
112 int (*get_subflow)(struct mptcp_sock *msk,
113 struct mptcp_sched_data *data);
115 char name[MPTCP_SCHED_NAME_MAX];
116 struct module *owner;
117 struct list_head list;
119 void (*init)(struct mptcp_sock *msk);
120 void (*release)(struct mptcp_sock *msk);
121 } ____cacheline_aligned_in_smp;
124 void mptcp_init(void);
126 static inline bool sk_is_mptcp(const struct sock *sk)
128 return tcp_sk(sk)->is_mptcp;
131 static inline bool rsk_is_mptcp(const struct request_sock *req)
133 return tcp_rsk(req)->is_mptcp;
136 static inline bool rsk_drop_req(const struct request_sock *req)
138 return tcp_rsk(req)->is_mptcp && tcp_rsk(req)->drop_req;
141 void mptcp_space(const struct sock *ssk, int *space, int *full_space);
142 bool mptcp_syn_options(struct sock *sk, const struct sk_buff *skb,
143 unsigned int *size, struct mptcp_out_options *opts);
144 bool mptcp_synack_options(const struct request_sock *req, unsigned int *size,
145 struct mptcp_out_options *opts);
146 bool mptcp_established_options(struct sock *sk, struct sk_buff *skb,
147 unsigned int *size, unsigned int remaining,
148 struct mptcp_out_options *opts);
149 bool mptcp_incoming_options(struct sock *sk, struct sk_buff *skb);
151 void mptcp_write_options(struct tcphdr *th, __be32 *ptr, struct tcp_sock *tp,
152 struct mptcp_out_options *opts);
154 void mptcp_diag_fill_info(struct mptcp_sock *msk, struct mptcp_info *info);
156 /* move the skb extension owership, with the assumption that 'to' is
159 static inline void mptcp_skb_ext_move(struct sk_buff *to,
160 struct sk_buff *from)
162 if (!skb_ext_exist(from, SKB_EXT_MPTCP))
165 if (WARN_ON_ONCE(to->active_extensions))
168 to->active_extensions = from->active_extensions;
169 to->extensions = from->extensions;
170 from->active_extensions = 0;
173 static inline void mptcp_skb_ext_copy(struct sk_buff *to,
174 struct sk_buff *from)
176 struct mptcp_ext *from_ext;
178 from_ext = skb_ext_find(from, SKB_EXT_MPTCP);
182 from_ext->frozen = 1;
183 skb_ext_copy(to, from);
186 static inline bool mptcp_ext_matches(const struct mptcp_ext *to_ext,
187 const struct mptcp_ext *from_ext)
189 /* MPTCP always clears the ext when adding it to the skb, so
190 * holes do not bother us here
193 (to_ext && from_ext &&
194 !memcmp(from_ext, to_ext, sizeof(struct mptcp_ext)));
197 /* check if skbs can be collapsed.
198 * MPTCP collapse is allowed if neither @to or @from carry an mptcp data
199 * mapping, or if the extension of @to is the same as @from.
200 * Collapsing is not possible if @to lacks an extension, but @from carries one.
202 static inline bool mptcp_skb_can_collapse(const struct sk_buff *to,
203 const struct sk_buff *from)
205 return mptcp_ext_matches(skb_ext_find(to, SKB_EXT_MPTCP),
206 skb_ext_find(from, SKB_EXT_MPTCP));
209 void mptcp_seq_show(struct seq_file *seq);
210 int mptcp_subflow_init_cookie_req(struct request_sock *req,
211 const struct sock *sk_listener,
212 struct sk_buff *skb);
213 struct request_sock *mptcp_subflow_reqsk_alloc(const struct request_sock_ops *ops,
214 struct sock *sk_listener,
215 bool attach_listener);
217 __be32 mptcp_get_reset_option(const struct sk_buff *skb);
219 static inline __be32 mptcp_reset_option(const struct sk_buff *skb)
221 if (skb_ext_exist(skb, SKB_EXT_MPTCP))
222 return mptcp_get_reset_option(skb);
227 void mptcp_active_detect_blackhole(struct sock *sk, bool expired);
230 static inline void mptcp_init(void)
234 static inline bool sk_is_mptcp(const struct sock *sk)
239 static inline bool rsk_is_mptcp(const struct request_sock *req)
244 static inline bool rsk_drop_req(const struct request_sock *req)
249 static inline bool mptcp_syn_options(struct sock *sk, const struct sk_buff *skb,
251 struct mptcp_out_options *opts)
256 static inline bool mptcp_synack_options(const struct request_sock *req,
258 struct mptcp_out_options *opts)
263 static inline bool mptcp_established_options(struct sock *sk,
266 unsigned int remaining,
267 struct mptcp_out_options *opts)
272 static inline bool mptcp_incoming_options(struct sock *sk,
278 static inline void mptcp_skb_ext_move(struct sk_buff *to,
279 const struct sk_buff *from)
283 static inline void mptcp_skb_ext_copy(struct sk_buff *to,
284 struct sk_buff *from)
288 static inline bool mptcp_skb_can_collapse(const struct sk_buff *to,
289 const struct sk_buff *from)
294 static inline void mptcp_space(const struct sock *ssk, int *s, int *fs) { }
295 static inline void mptcp_seq_show(struct seq_file *seq) { }
297 static inline int mptcp_subflow_init_cookie_req(struct request_sock *req,
298 const struct sock *sk_listener,
301 return 0; /* TCP fallback */
304 static inline struct request_sock *mptcp_subflow_reqsk_alloc(const struct request_sock_ops *ops,
305 struct sock *sk_listener,
306 bool attach_listener)
311 static inline __be32 mptcp_reset_option(const struct sk_buff *skb) { return htonl(0u); }
313 static inline void mptcp_active_detect_blackhole(struct sock *sk, bool expired) { }
314 #endif /* CONFIG_MPTCP */
316 #if IS_ENABLED(CONFIG_MPTCP_IPV6)
317 int mptcpv6_init(void);
318 void mptcpv6_handle_mapped(struct sock *sk, bool mapped);
319 #elif IS_ENABLED(CONFIG_IPV6)
320 static inline int mptcpv6_init(void) { return 0; }
321 static inline void mptcpv6_handle_mapped(struct sock *sk, bool mapped) { }
324 #if defined(CONFIG_MPTCP) && defined(CONFIG_BPF_SYSCALL)
325 struct mptcp_sock *bpf_mptcp_sock_from_subflow(struct sock *sk);
327 static inline struct mptcp_sock *bpf_mptcp_sock_from_subflow(struct sock *sk) { return NULL; }
330 #if !IS_ENABLED(CONFIG_MPTCP)
331 struct mptcp_sock { };
334 #endif /* __NET_MPTCP_H */