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242 lines
5.5 KiB
242 lines
5.5 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* |
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* Multipath TCP |
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* |
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* Copyright (c) 2017 - 2019, Intel Corporation. |
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*/ |
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#ifndef __NET_MPTCP_H |
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#define __NET_MPTCP_H |
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#include <linux/skbuff.h> |
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#include <linux/tcp.h> |
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#include <linux/types.h> |
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struct seq_file; |
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/* MPTCP sk_buff extension data */ |
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struct mptcp_ext { |
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union { |
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u64 data_ack; |
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u32 data_ack32; |
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}; |
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u64 data_seq; |
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u32 subflow_seq; |
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u16 data_len; |
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u8 use_map:1, |
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dsn64:1, |
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data_fin:1, |
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use_ack:1, |
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ack64:1, |
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mpc_map:1, |
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frozen:1, |
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__unused:1; |
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/* one byte hole */ |
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}; |
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struct mptcp_out_options { |
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#if IS_ENABLED(CONFIG_MPTCP) |
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u16 suboptions; |
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u64 sndr_key; |
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u64 rcvr_key; |
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union { |
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struct in_addr addr; |
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#if IS_ENABLED(CONFIG_MPTCP_IPV6) |
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struct in6_addr addr6; |
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#endif |
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}; |
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u8 addr_id; |
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u16 port; |
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u64 ahmac; |
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u8 rm_id; |
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u8 join_id; |
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u8 backup; |
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u32 nonce; |
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u64 thmac; |
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u32 token; |
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u8 hmac[20]; |
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struct mptcp_ext ext_copy; |
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#endif |
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}; |
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#ifdef CONFIG_MPTCP |
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extern struct request_sock_ops mptcp_subflow_request_sock_ops; |
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void mptcp_init(void); |
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static inline bool sk_is_mptcp(const struct sock *sk) |
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{ |
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return tcp_sk(sk)->is_mptcp; |
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} |
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static inline bool rsk_is_mptcp(const struct request_sock *req) |
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{ |
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return tcp_rsk(req)->is_mptcp; |
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} |
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static inline bool rsk_drop_req(const struct request_sock *req) |
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{ |
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return tcp_rsk(req)->is_mptcp && tcp_rsk(req)->drop_req; |
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} |
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void mptcp_space(const struct sock *ssk, int *space, int *full_space); |
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bool mptcp_syn_options(struct sock *sk, const struct sk_buff *skb, |
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unsigned int *size, struct mptcp_out_options *opts); |
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bool mptcp_synack_options(const struct request_sock *req, unsigned int *size, |
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struct mptcp_out_options *opts); |
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bool mptcp_established_options(struct sock *sk, struct sk_buff *skb, |
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unsigned int *size, unsigned int remaining, |
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struct mptcp_out_options *opts); |
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void mptcp_incoming_options(struct sock *sk, struct sk_buff *skb); |
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void mptcp_write_options(__be32 *ptr, const struct tcp_sock *tp, |
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struct mptcp_out_options *opts); |
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/* move the skb extension owership, with the assumption that 'to' is |
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* newly allocated |
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*/ |
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static inline void mptcp_skb_ext_move(struct sk_buff *to, |
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struct sk_buff *from) |
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{ |
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if (!skb_ext_exist(from, SKB_EXT_MPTCP)) |
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return; |
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if (WARN_ON_ONCE(to->active_extensions)) |
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skb_ext_put(to); |
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to->active_extensions = from->active_extensions; |
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to->extensions = from->extensions; |
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from->active_extensions = 0; |
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} |
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static inline void mptcp_skb_ext_copy(struct sk_buff *to, |
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struct sk_buff *from) |
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{ |
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struct mptcp_ext *from_ext; |
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from_ext = skb_ext_find(from, SKB_EXT_MPTCP); |
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if (!from_ext) |
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return; |
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from_ext->frozen = 1; |
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skb_ext_copy(to, from); |
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} |
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static inline bool mptcp_ext_matches(const struct mptcp_ext *to_ext, |
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const struct mptcp_ext *from_ext) |
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{ |
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/* MPTCP always clears the ext when adding it to the skb, so |
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* holes do not bother us here |
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*/ |
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return !from_ext || |
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(to_ext && from_ext && |
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!memcmp(from_ext, to_ext, sizeof(struct mptcp_ext))); |
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} |
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/* check if skbs can be collapsed. |
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* MPTCP collapse is allowed if neither @to or @from carry an mptcp data |
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* mapping, or if the extension of @to is the same as @from. |
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* Collapsing is not possible if @to lacks an extension, but @from carries one. |
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*/ |
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static inline bool mptcp_skb_can_collapse(const struct sk_buff *to, |
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const struct sk_buff *from) |
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{ |
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return mptcp_ext_matches(skb_ext_find(to, SKB_EXT_MPTCP), |
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skb_ext_find(from, SKB_EXT_MPTCP)); |
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} |
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void mptcp_seq_show(struct seq_file *seq); |
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int mptcp_subflow_init_cookie_req(struct request_sock *req, |
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const struct sock *sk_listener, |
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struct sk_buff *skb); |
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#else |
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static inline void mptcp_init(void) |
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{ |
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} |
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static inline bool sk_is_mptcp(const struct sock *sk) |
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{ |
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return false; |
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} |
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static inline bool rsk_is_mptcp(const struct request_sock *req) |
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{ |
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return false; |
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} |
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static inline bool rsk_drop_req(const struct request_sock *req) |
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{ |
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return false; |
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} |
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static inline void mptcp_parse_option(const struct sk_buff *skb, |
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const unsigned char *ptr, int opsize, |
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struct tcp_options_received *opt_rx) |
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{ |
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} |
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static inline bool mptcp_syn_options(struct sock *sk, const struct sk_buff *skb, |
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unsigned int *size, |
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struct mptcp_out_options *opts) |
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{ |
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return false; |
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} |
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static inline bool mptcp_synack_options(const struct request_sock *req, |
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unsigned int *size, |
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struct mptcp_out_options *opts) |
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{ |
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return false; |
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} |
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static inline bool mptcp_established_options(struct sock *sk, |
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struct sk_buff *skb, |
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unsigned int *size, |
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unsigned int remaining, |
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struct mptcp_out_options *opts) |
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{ |
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return false; |
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} |
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static inline void mptcp_incoming_options(struct sock *sk, |
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struct sk_buff *skb) |
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{ |
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} |
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static inline void mptcp_skb_ext_move(struct sk_buff *to, |
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const struct sk_buff *from) |
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{ |
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} |
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static inline void mptcp_skb_ext_copy(struct sk_buff *to, |
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struct sk_buff *from) |
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{ |
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} |
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static inline bool mptcp_skb_can_collapse(const struct sk_buff *to, |
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const struct sk_buff *from) |
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{ |
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return true; |
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} |
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static inline void mptcp_space(const struct sock *ssk, int *s, int *fs) { } |
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static inline void mptcp_seq_show(struct seq_file *seq) { } |
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static inline int mptcp_subflow_init_cookie_req(struct request_sock *req, |
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const struct sock *sk_listener, |
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struct sk_buff *skb) |
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{ |
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return 0; /* TCP fallback */ |
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} |
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#endif /* CONFIG_MPTCP */ |
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#if IS_ENABLED(CONFIG_MPTCP_IPV6) |
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int mptcpv6_init(void); |
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void mptcpv6_handle_mapped(struct sock *sk, bool mapped); |
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#elif IS_ENABLED(CONFIG_IPV6) |
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static inline int mptcpv6_init(void) { return 0; } |
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static inline void mptcpv6_handle_mapped(struct sock *sk, bool mapped) { } |
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#endif |
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#endif /* __NET_MPTCP_H */
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