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 void mptcp_parse_option(const struct sk_buff *skb, const unsigned char *ptr,
72 int opsize, struct tcp_options_received *opt_rx);
73 bool mptcp_syn_options(struct sock *sk, const struct sk_buff *skb,
74 unsigned int *size, struct mptcp_out_options *opts);
75 void mptcp_rcv_synsent(struct sock *sk);
76 bool mptcp_synack_options(const struct request_sock *req, unsigned int *size,
77 struct mptcp_out_options *opts);
78 bool mptcp_established_options(struct sock *sk, struct sk_buff *skb,
79 unsigned int *size, unsigned int remaining,
80 struct mptcp_out_options *opts);
81 void mptcp_incoming_options(struct sock *sk, struct sk_buff *skb,
82 struct tcp_options_received *opt_rx);
84 void mptcp_write_options(__be32 *ptr, struct mptcp_out_options *opts);
86 /* move the skb extension owership, with the assumption that 'to' is
89 static inline void mptcp_skb_ext_move(struct sk_buff *to,
92 if (!skb_ext_exist(from, SKB_EXT_MPTCP))
95 if (WARN_ON_ONCE(to->active_extensions))
98 to->active_extensions = from->active_extensions;
99 to->extensions = from->extensions;
100 from->active_extensions = 0;
103 static inline bool mptcp_ext_matches(const struct mptcp_ext *to_ext,
104 const struct mptcp_ext *from_ext)
106 /* MPTCP always clears the ext when adding it to the skb, so
107 * holes do not bother us here
110 (to_ext && from_ext &&
111 !memcmp(from_ext, to_ext, sizeof(struct mptcp_ext)));
114 /* check if skbs can be collapsed.
115 * MPTCP collapse is allowed if neither @to or @from carry an mptcp data
116 * mapping, or if the extension of @to is the same as @from.
117 * Collapsing is not possible if @to lacks an extension, but @from carries one.
119 static inline bool mptcp_skb_can_collapse(const struct sk_buff *to,
120 const struct sk_buff *from)
122 return mptcp_ext_matches(skb_ext_find(to, SKB_EXT_MPTCP),
123 skb_ext_find(from, SKB_EXT_MPTCP));
126 bool mptcp_sk_is_subflow(const struct sock *sk);
128 void mptcp_seq_show(struct seq_file *seq);
131 static inline void mptcp_init(void)
135 static inline bool sk_is_mptcp(const struct sock *sk)
140 static inline bool rsk_is_mptcp(const struct request_sock *req)
145 static inline void mptcp_parse_option(const struct sk_buff *skb,
146 const unsigned char *ptr, int opsize,
147 struct tcp_options_received *opt_rx)
151 static inline bool mptcp_syn_options(struct sock *sk, const struct sk_buff *skb,
153 struct mptcp_out_options *opts)
158 static inline void mptcp_rcv_synsent(struct sock *sk)
162 static inline bool mptcp_synack_options(const struct request_sock *req,
164 struct mptcp_out_options *opts)
169 static inline bool mptcp_established_options(struct sock *sk,
172 unsigned int remaining,
173 struct mptcp_out_options *opts)
178 static inline void mptcp_incoming_options(struct sock *sk,
180 struct tcp_options_received *opt_rx)
184 static inline void mptcp_skb_ext_move(struct sk_buff *to,
185 const struct sk_buff *from)
189 static inline bool mptcp_skb_can_collapse(const struct sk_buff *to,
190 const struct sk_buff *from)
195 static inline bool mptcp_sk_is_subflow(const struct sock *sk)
200 static inline void mptcp_seq_show(struct seq_file *seq) { }
201 #endif /* CONFIG_MPTCP */
203 #if IS_ENABLED(CONFIG_MPTCP_IPV6)
204 int mptcpv6_init(void);
205 void mptcpv6_handle_mapped(struct sock *sk, bool mapped);
206 #elif IS_ENABLED(CONFIG_IPV6)
207 static inline int mptcpv6_init(void) { return 0; }
208 static inline void mptcpv6_handle_mapped(struct sock *sk, bool mapped) { }
211 #endif /* __NET_MPTCP_H */