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EDIT: mptcp.h
/* SPDX-License-Identifier: GPL-2.0 */ /* * Multipath TCP * * Copyright (c) 2017 - 2019, Intel Corporation. */ #ifndef __NET_MPTCP_H #define __NET_MPTCP_H #include <linux/skbuff.h> #include <linux/tcp.h> #include <linux/types.h> struct seq_file; /* MPTCP sk_buff extension data */ struct mptcp_ext { union { u64 data_ack; u32 data_ack32; }; u64 data_seq; u32 subflow_seq; u16 data_len; u8 use_map:1, dsn64:1, data_fin:1, use_ack:1, ack64:1, mpc_map:1, frozen:1, reset_transient:1; u8 reset_reason:4; }; #define MPTCP_RM_IDS_MAX 8 struct mptcp_rm_list { u8 ids[MPTCP_RM_IDS_MAX]; u8 nr; }; struct mptcp_addr_info { u8 id; sa_family_t family; __be16 port; union { struct in_addr addr; #if IS_ENABLED(CONFIG_MPTCP_IPV6) struct in6_addr addr6; #endif }; }; struct mptcp_out_options { #if IS_ENABLED(CONFIG_MPTCP) u16 suboptions; u64 sndr_key; u64 rcvr_key; u64 ahmac; struct mptcp_addr_info addr; struct mptcp_rm_list rm_list; u8 join_id; u8 backup; u8 reset_reason:4; u8 reset_transient:1; u32 nonce; u64 thmac; u32 token; u8 hmac[20]; struct mptcp_ext ext_copy; #endif }; #ifdef CONFIG_MPTCP extern struct request_sock_ops mptcp_subflow_request_sock_ops; void mptcp_init(void); static inline bool sk_is_mptcp(const struct sock *sk) { return tcp_sk(sk)->is_mptcp; } static inline bool rsk_is_mptcp(const struct request_sock *req) { return tcp_rsk(req)->is_mptcp; } static inline bool rsk_drop_req(const struct request_sock *req) { return tcp_rsk(req)->is_mptcp && tcp_rsk(req)->drop_req; } void mptcp_space(const struct sock *ssk, int *space, int *full_space); bool mptcp_syn_options(struct sock *sk, const struct sk_buff *skb, unsigned int *size, struct mptcp_out_options *opts); bool mptcp_synack_options(const struct request_sock *req, unsigned int *size, struct mptcp_out_options *opts); bool mptcp_established_options(struct sock *sk, struct sk_buff *skb, unsigned int *size, unsigned int remaining, struct mptcp_out_options *opts); bool mptcp_incoming_options(struct sock *sk, struct sk_buff *skb); void mptcp_write_options(__be32 *ptr, const struct tcp_sock *tp, struct mptcp_out_options *opts); /* move the skb extension owership, with the assumption that 'to' is * newly allocated */ static inline void mptcp_skb_ext_move(struct sk_buff *to, struct sk_buff *from) { if (!skb_ext_exist(from, SKB_EXT_MPTCP)) return; if (WARN_ON_ONCE(to->active_extensions)) skb_ext_put(to); to->active_extensions = from->active_extensions; to->extensions = from->extensions; from->active_extensions = 0; } static inline void mptcp_skb_ext_copy(struct sk_buff *to, struct sk_buff *from) { struct mptcp_ext *from_ext; from_ext = skb_ext_find(from, SKB_EXT_MPTCP); if (!from_ext) return; from_ext->frozen = 1; skb_ext_copy(to, from); } static inline bool mptcp_ext_matches(const struct mptcp_ext *to_ext, const struct mptcp_ext *from_ext) { /* MPTCP always clears the ext when adding it to the skb, so * holes do not bother us here */ return !from_ext || (to_ext && from_ext && !memcmp(from_ext, to_ext, sizeof(struct mptcp_ext))); } /* check if skbs can be collapsed. * MPTCP collapse is allowed if neither @to or @from carry an mptcp data * mapping, or if the extension of @to is the same as @from. * Collapsing is not possible if @to lacks an extension, but @from carries one. */ static inline bool mptcp_skb_can_collapse(const struct sk_buff *to, const struct sk_buff *from) { return mptcp_ext_matches(skb_ext_find(to, SKB_EXT_MPTCP), skb_ext_find(from, SKB_EXT_MPTCP)); } void mptcp_seq_show(struct seq_file *seq); int mptcp_subflow_init_cookie_req(struct request_sock *req, const struct sock *sk_listener, struct sk_buff *skb); __be32 mptcp_get_reset_option(const struct sk_buff *skb); static inline __be32 mptcp_reset_option(const struct sk_buff *skb) { if (skb_ext_exist(skb, SKB_EXT_MPTCP)) return mptcp_get_reset_option(skb); return htonl(0u); } #else static inline void mptcp_init(void) { } static inline bool sk_is_mptcp(const struct sock *sk) { return false; } static inline bool rsk_is_mptcp(const struct request_sock *req) { return false; } static inline bool rsk_drop_req(const struct request_sock *req) { return false; } static inline void mptcp_parse_option(const struct sk_buff *skb, const unsigned char *ptr, int opsize, struct tcp_options_received *opt_rx) { } static inline bool mptcp_syn_options(struct sock *sk, const struct sk_buff *skb, unsigned int *size, struct mptcp_out_options *opts) { return false; } static inline bool mptcp_synack_options(const struct request_sock *req, unsigned int *size, struct mptcp_out_options *opts) { return false; } static inline bool mptcp_established_options(struct sock *sk, struct sk_buff *skb, unsigned int *size, unsigned int remaining, struct mptcp_out_options *opts) { return false; } static inline bool mptcp_incoming_options(struct sock *sk, struct sk_buff *skb) { return true; } static inline void mptcp_skb_ext_move(struct sk_buff *to, const struct sk_buff *from) { } static inline void mptcp_skb_ext_copy(struct sk_buff *to, struct sk_buff *from) { } static inline bool mptcp_skb_can_collapse(const struct sk_buff *to, const struct sk_buff *from) { return true; } static inline void mptcp_space(const struct sock *ssk, int *s, int *fs) { } static inline void mptcp_seq_show(struct seq_file *seq) { } static inline int mptcp_subflow_init_cookie_req(struct request_sock *req, const struct sock *sk_listener, struct sk_buff *skb) { return 0; /* TCP fallback */ } static inline __be32 mptcp_reset_option(const struct sk_buff *skb) { return htonl(0u); } #endif /* CONFIG_MPTCP */ #if IS_ENABLED(CONFIG_MPTCP_IPV6) int mptcpv6_init(void); void mptcpv6_handle_mapped(struct sock *sk, bool mapped); #elif IS_ENABLED(CONFIG_IPV6) static inline int mptcpv6_init(void) { return 0; } static inline void mptcpv6_handle_mapped(struct sock *sk, bool mapped) { } #endif #endif /* __NET_MPTCP_H */