13ee17bc7SMat Martineau /* SPDX-License-Identifier: GPL-2.0 */ 23ee17bc7SMat Martineau /* 33ee17bc7SMat Martineau * Multipath TCP 43ee17bc7SMat Martineau * 53ee17bc7SMat Martineau * Copyright (c) 2017 - 2019, Intel Corporation. 63ee17bc7SMat Martineau */ 73ee17bc7SMat Martineau 83ee17bc7SMat Martineau #ifndef __NET_MPTCP_H 93ee17bc7SMat Martineau #define __NET_MPTCP_H 103ee17bc7SMat Martineau 1185712484SMat Martineau #include <linux/skbuff.h> 12eda7acddSPeter Krystad #include <linux/tcp.h> 133ee17bc7SMat Martineau #include <linux/types.h> 143ee17bc7SMat Martineau 1561bc6e82SFlorian Westphal struct mptcp_info; 1661bc6e82SFlorian Westphal struct mptcp_sock; 17fc518953SFlorian Westphal struct seq_file; 18fc518953SFlorian Westphal 193ee17bc7SMat Martineau /* MPTCP sk_buff extension data */ 203ee17bc7SMat Martineau struct mptcp_ext { 21a0c1d0eaSChristoph Paasch union { 223ee17bc7SMat Martineau u64 data_ack; 23a0c1d0eaSChristoph Paasch u32 data_ack32; 24a0c1d0eaSChristoph Paasch }; 253ee17bc7SMat Martineau u64 data_seq; 263ee17bc7SMat Martineau u32 subflow_seq; 273ee17bc7SMat Martineau u16 data_len; 28d0cc2987SGeliang Tang __sum16 csum; 293ee17bc7SMat Martineau u8 use_map:1, 303ee17bc7SMat Martineau dsn64:1, 313ee17bc7SMat Martineau data_fin:1, 323ee17bc7SMat Martineau use_ack:1, 333ee17bc7SMat Martineau ack64:1, 34cc7972eaSChristoph Paasch mpc_map:1, 355a369ca6SPaolo Abeni frozen:1, 36dc87efdbSFlorian Westphal reset_transient:1; 37208e8f66SGeliang Tang u8 reset_reason:4, 381e39e5a3SGeliang Tang csum_reqd:1, 391e39e5a3SGeliang Tang infinite_map:1; 403ee17bc7SMat Martineau }; 413ee17bc7SMat Martineau 426445e17aSGeliang Tang #define MPTCP_RM_IDS_MAX 8 436445e17aSGeliang Tang 446445e17aSGeliang Tang struct mptcp_rm_list { 456445e17aSGeliang Tang u8 ids[MPTCP_RM_IDS_MAX]; 466445e17aSGeliang Tang u8 nr; 476445e17aSGeliang Tang }; 486445e17aSGeliang Tang 4930f60baeSGeliang Tang struct mptcp_addr_info { 5030f60baeSGeliang Tang u8 id; 5130f60baeSGeliang Tang sa_family_t family; 5230f60baeSGeliang Tang __be16 port; 533df523abSPeter Krystad union { 543df523abSPeter Krystad struct in_addr addr; 553df523abSPeter Krystad #if IS_ENABLED(CONFIG_MPTCP_IPV6) 563df523abSPeter Krystad struct in6_addr addr6; 573df523abSPeter Krystad #endif 583df523abSPeter Krystad }; 5930f60baeSGeliang Tang }; 6030f60baeSGeliang Tang 6130f60baeSGeliang Tang struct mptcp_out_options { 6230f60baeSGeliang Tang #if IS_ENABLED(CONFIG_MPTCP) 6330f60baeSGeliang Tang u16 suboptions; 646445e17aSGeliang Tang struct mptcp_rm_list rm_list; 65f296234cSPeter Krystad u8 join_id; 66f296234cSPeter Krystad u8 backup; 6706fe1719SGeliang Tang u8 reset_reason:4, 6806fe1719SGeliang Tang reset_transient:1, 69bab6b88eSGeliang Tang csum_reqd:1, 70bab6b88eSGeliang Tang allow_join_id0:1; 71d7b26908SPaolo Abeni union { 72d7b26908SPaolo Abeni struct { 73d7b26908SPaolo Abeni u64 sndr_key; 74d7b26908SPaolo Abeni u64 rcvr_key; 75f7cc8890SDavide Caratti u64 data_seq; 76f7cc8890SDavide Caratti u32 subflow_seq; 77f7cc8890SDavide Caratti u16 data_len; 78f7cc8890SDavide Caratti __sum16 csum; 79d7b26908SPaolo Abeni }; 80d7b26908SPaolo Abeni struct { 81d7b26908SPaolo Abeni struct mptcp_addr_info addr; 82d7b26908SPaolo Abeni u64 ahmac; 83d7b26908SPaolo Abeni }; 84c25aeb4eSGeliang Tang struct { 856d0060f6SMat Martineau struct mptcp_ext ext_copy; 86c25aeb4eSGeliang Tang u64 fail_seq; 87c25aeb4eSGeliang Tang }; 88d7b26908SPaolo Abeni struct { 89d7b26908SPaolo Abeni u32 nonce; 90d7b26908SPaolo Abeni u32 token; 91d7b26908SPaolo Abeni u64 thmac; 92d7b26908SPaolo Abeni u8 hmac[20]; 93d7b26908SPaolo Abeni }; 94d7b26908SPaolo Abeni }; 95eda7acddSPeter Krystad #endif 96eda7acddSPeter Krystad }; 97eda7acddSPeter Krystad 9885712484SMat Martineau #ifdef CONFIG_MPTCP 9908b8d080SFlorian Westphal extern struct request_sock_ops mptcp_subflow_request_sock_ops; 10085712484SMat Martineau 101f870fa0bSMat Martineau void mptcp_init(void); 102f870fa0bSMat Martineau 103cec37a6eSPeter Krystad static inline bool sk_is_mptcp(const struct sock *sk) 104cec37a6eSPeter Krystad { 105cec37a6eSPeter Krystad return tcp_sk(sk)->is_mptcp; 106cec37a6eSPeter Krystad } 107cec37a6eSPeter Krystad 108cec37a6eSPeter Krystad static inline bool rsk_is_mptcp(const struct request_sock *req) 109cec37a6eSPeter Krystad { 110cec37a6eSPeter Krystad return tcp_rsk(req)->is_mptcp; 111cec37a6eSPeter Krystad } 112cec37a6eSPeter Krystad 11390bf4513SPaolo Abeni static inline bool rsk_drop_req(const struct request_sock *req) 11490bf4513SPaolo Abeni { 11590bf4513SPaolo Abeni return tcp_rsk(req)->is_mptcp && tcp_rsk(req)->drop_req; 11690bf4513SPaolo Abeni } 11790bf4513SPaolo Abeni 118071c8ed6SFlorian Westphal void mptcp_space(const struct sock *ssk, int *space, int *full_space); 119cc7972eaSChristoph Paasch bool mptcp_syn_options(struct sock *sk, const struct sk_buff *skb, 120cc7972eaSChristoph Paasch unsigned int *size, struct mptcp_out_options *opts); 121cec37a6eSPeter Krystad bool mptcp_synack_options(const struct request_sock *req, unsigned int *size, 122cec37a6eSPeter Krystad struct mptcp_out_options *opts); 123cec37a6eSPeter Krystad bool mptcp_established_options(struct sock *sk, struct sk_buff *skb, 124cec37a6eSPeter Krystad unsigned int *size, unsigned int remaining, 125cec37a6eSPeter Krystad struct mptcp_out_options *opts); 1266787b7e3SJianguo Wu bool mptcp_incoming_options(struct sock *sk, struct sk_buff *skb); 127cec37a6eSPeter Krystad 128fa3fe2b1SFlorian Westphal void mptcp_write_options(__be32 *ptr, const struct tcp_sock *tp, 129fa3fe2b1SFlorian Westphal struct mptcp_out_options *opts); 130eda7acddSPeter Krystad 13161bc6e82SFlorian Westphal void mptcp_diag_fill_info(struct mptcp_sock *msk, struct mptcp_info *info); 13261bc6e82SFlorian Westphal 13385712484SMat Martineau /* move the skb extension owership, with the assumption that 'to' is 13485712484SMat Martineau * newly allocated 13585712484SMat Martineau */ 13685712484SMat Martineau static inline void mptcp_skb_ext_move(struct sk_buff *to, 13785712484SMat Martineau struct sk_buff *from) 13885712484SMat Martineau { 13985712484SMat Martineau if (!skb_ext_exist(from, SKB_EXT_MPTCP)) 14085712484SMat Martineau return; 14185712484SMat Martineau 14285712484SMat Martineau if (WARN_ON_ONCE(to->active_extensions)) 14385712484SMat Martineau skb_ext_put(to); 14485712484SMat Martineau 14585712484SMat Martineau to->active_extensions = from->active_extensions; 14685712484SMat Martineau to->extensions = from->extensions; 14785712484SMat Martineau from->active_extensions = 0; 14885712484SMat Martineau } 14985712484SMat Martineau 1505a369ca6SPaolo Abeni static inline void mptcp_skb_ext_copy(struct sk_buff *to, 1515a369ca6SPaolo Abeni struct sk_buff *from) 1525a369ca6SPaolo Abeni { 1535a369ca6SPaolo Abeni struct mptcp_ext *from_ext; 1545a369ca6SPaolo Abeni 1555a369ca6SPaolo Abeni from_ext = skb_ext_find(from, SKB_EXT_MPTCP); 1565a369ca6SPaolo Abeni if (!from_ext) 1575a369ca6SPaolo Abeni return; 1585a369ca6SPaolo Abeni 1595a369ca6SPaolo Abeni from_ext->frozen = 1; 1605a369ca6SPaolo Abeni skb_ext_copy(to, from); 1615a369ca6SPaolo Abeni } 1625a369ca6SPaolo Abeni 16385712484SMat Martineau static inline bool mptcp_ext_matches(const struct mptcp_ext *to_ext, 16485712484SMat Martineau const struct mptcp_ext *from_ext) 16585712484SMat Martineau { 16685712484SMat Martineau /* MPTCP always clears the ext when adding it to the skb, so 16785712484SMat Martineau * holes do not bother us here 16885712484SMat Martineau */ 16985712484SMat Martineau return !from_ext || 17085712484SMat Martineau (to_ext && from_ext && 17185712484SMat Martineau !memcmp(from_ext, to_ext, sizeof(struct mptcp_ext))); 17285712484SMat Martineau } 17385712484SMat Martineau 17485712484SMat Martineau /* check if skbs can be collapsed. 17585712484SMat Martineau * MPTCP collapse is allowed if neither @to or @from carry an mptcp data 17685712484SMat Martineau * mapping, or if the extension of @to is the same as @from. 17785712484SMat Martineau * Collapsing is not possible if @to lacks an extension, but @from carries one. 17885712484SMat Martineau */ 17985712484SMat Martineau static inline bool mptcp_skb_can_collapse(const struct sk_buff *to, 18085712484SMat Martineau const struct sk_buff *from) 18185712484SMat Martineau { 18285712484SMat Martineau return mptcp_ext_matches(skb_ext_find(to, SKB_EXT_MPTCP), 18385712484SMat Martineau skb_ext_find(from, SKB_EXT_MPTCP)); 18485712484SMat Martineau } 18585712484SMat Martineau 186fc518953SFlorian Westphal void mptcp_seq_show(struct seq_file *seq); 187c83a47e5SFlorian Westphal int mptcp_subflow_init_cookie_req(struct request_sock *req, 188c83a47e5SFlorian Westphal const struct sock *sk_listener, 189c83a47e5SFlorian Westphal struct sk_buff *skb); 190dc87efdbSFlorian Westphal 191dc87efdbSFlorian Westphal __be32 mptcp_get_reset_option(const struct sk_buff *skb); 192dc87efdbSFlorian Westphal 193dc87efdbSFlorian Westphal static inline __be32 mptcp_reset_option(const struct sk_buff *skb) 194dc87efdbSFlorian Westphal { 195dc87efdbSFlorian Westphal if (skb_ext_exist(skb, SKB_EXT_MPTCP)) 196dc87efdbSFlorian Westphal return mptcp_get_reset_option(skb); 197dc87efdbSFlorian Westphal 198dc87efdbSFlorian Westphal return htonl(0u); 199dc87efdbSFlorian Westphal } 20085712484SMat Martineau #else 20185712484SMat Martineau 202f870fa0bSMat Martineau static inline void mptcp_init(void) 203f870fa0bSMat Martineau { 204f870fa0bSMat Martineau } 205f870fa0bSMat Martineau 206cec37a6eSPeter Krystad static inline bool sk_is_mptcp(const struct sock *sk) 207cec37a6eSPeter Krystad { 208cec37a6eSPeter Krystad return false; 209cec37a6eSPeter Krystad } 210cec37a6eSPeter Krystad 211cec37a6eSPeter Krystad static inline bool rsk_is_mptcp(const struct request_sock *req) 212cec37a6eSPeter Krystad { 213cec37a6eSPeter Krystad return false; 214cec37a6eSPeter Krystad } 215cec37a6eSPeter Krystad 21690bf4513SPaolo Abeni static inline bool rsk_drop_req(const struct request_sock *req) 21790bf4513SPaolo Abeni { 21890bf4513SPaolo Abeni return false; 21990bf4513SPaolo Abeni } 22090bf4513SPaolo Abeni 221cc7972eaSChristoph Paasch static inline bool mptcp_syn_options(struct sock *sk, const struct sk_buff *skb, 222cc7972eaSChristoph Paasch unsigned int *size, 223cec37a6eSPeter Krystad struct mptcp_out_options *opts) 224cec37a6eSPeter Krystad { 225cec37a6eSPeter Krystad return false; 226cec37a6eSPeter Krystad } 227cec37a6eSPeter Krystad 228cec37a6eSPeter Krystad static inline bool mptcp_synack_options(const struct request_sock *req, 229cec37a6eSPeter Krystad unsigned int *size, 230cec37a6eSPeter Krystad struct mptcp_out_options *opts) 231cec37a6eSPeter Krystad { 232cec37a6eSPeter Krystad return false; 233cec37a6eSPeter Krystad } 234cec37a6eSPeter Krystad 235cec37a6eSPeter Krystad static inline bool mptcp_established_options(struct sock *sk, 236cec37a6eSPeter Krystad struct sk_buff *skb, 237cec37a6eSPeter Krystad unsigned int *size, 238cec37a6eSPeter Krystad unsigned int remaining, 239cec37a6eSPeter Krystad struct mptcp_out_options *opts) 240cec37a6eSPeter Krystad { 241cec37a6eSPeter Krystad return false; 242cec37a6eSPeter Krystad } 243cec37a6eSPeter Krystad 2446787b7e3SJianguo Wu static inline bool mptcp_incoming_options(struct sock *sk, 24577d0cab9SFlorian Westphal struct sk_buff *skb) 246648ef4b8SMat Martineau { 2476787b7e3SJianguo Wu return true; 248648ef4b8SMat Martineau } 249648ef4b8SMat Martineau 25085712484SMat Martineau static inline void mptcp_skb_ext_move(struct sk_buff *to, 25185712484SMat Martineau const struct sk_buff *from) 25285712484SMat Martineau { 25385712484SMat Martineau } 25485712484SMat Martineau 2555a369ca6SPaolo Abeni static inline void mptcp_skb_ext_copy(struct sk_buff *to, 2565a369ca6SPaolo Abeni struct sk_buff *from) 2575a369ca6SPaolo Abeni { 2585a369ca6SPaolo Abeni } 2595a369ca6SPaolo Abeni 26085712484SMat Martineau static inline bool mptcp_skb_can_collapse(const struct sk_buff *to, 26185712484SMat Martineau const struct sk_buff *from) 26285712484SMat Martineau { 26385712484SMat Martineau return true; 26485712484SMat Martineau } 26585712484SMat Martineau 266071c8ed6SFlorian Westphal static inline void mptcp_space(const struct sock *ssk, int *s, int *fs) { } 267fc518953SFlorian Westphal static inline void mptcp_seq_show(struct seq_file *seq) { } 268c83a47e5SFlorian Westphal 269c83a47e5SFlorian Westphal static inline int mptcp_subflow_init_cookie_req(struct request_sock *req, 270c83a47e5SFlorian Westphal const struct sock *sk_listener, 271c83a47e5SFlorian Westphal struct sk_buff *skb) 272c83a47e5SFlorian Westphal { 273c83a47e5SFlorian Westphal return 0; /* TCP fallback */ 274c83a47e5SFlorian Westphal } 275dc87efdbSFlorian Westphal 276dc87efdbSFlorian Westphal static inline __be32 mptcp_reset_option(const struct sk_buff *skb) { return htonl(0u); } 27785712484SMat Martineau #endif /* CONFIG_MPTCP */ 278f870fa0bSMat Martineau 279f870fa0bSMat Martineau #if IS_ENABLED(CONFIG_MPTCP_IPV6) 280f870fa0bSMat Martineau int mptcpv6_init(void); 28131484d56SGeert Uytterhoeven void mptcpv6_handle_mapped(struct sock *sk, bool mapped); 282f870fa0bSMat Martineau #elif IS_ENABLED(CONFIG_IPV6) 28331484d56SGeert Uytterhoeven static inline int mptcpv6_init(void) { return 0; } 28431484d56SGeert Uytterhoeven static inline void mptcpv6_handle_mapped(struct sock *sk, bool mapped) { } 285f870fa0bSMat Martineau #endif 286f870fa0bSMat Martineau 287*3bc253c2SGeliang Tang #if defined(CONFIG_MPTCP) && defined(CONFIG_BPF_SYSCALL) 288*3bc253c2SGeliang Tang struct mptcp_sock *bpf_mptcp_sock_from_subflow(struct sock *sk); 289*3bc253c2SGeliang Tang #else 290*3bc253c2SGeliang Tang static inline struct mptcp_sock *bpf_mptcp_sock_from_subflow(struct sock *sk) { return NULL; } 291*3bc253c2SGeliang Tang #endif 292*3bc253c2SGeliang Tang 2933ee17bc7SMat Martineau #endif /* __NET_MPTCP_H */ 294