1f870fa0bSMat Martineau /* SPDX-License-Identifier: GPL-2.0 */ 2f870fa0bSMat Martineau /* Multipath TCP 3f870fa0bSMat Martineau * 4f870fa0bSMat Martineau * Copyright (c) 2017 - 2019, Intel Corporation. 5f870fa0bSMat Martineau */ 6f870fa0bSMat Martineau 7f870fa0bSMat Martineau #ifndef __MPTCP_PROTOCOL_H 8f870fa0bSMat Martineau #define __MPTCP_PROTOCOL_H 9f870fa0bSMat Martineau 1079c0949eSPeter Krystad #include <linux/random.h> 1179c0949eSPeter Krystad #include <net/tcp.h> 1279c0949eSPeter Krystad #include <net/inet_connection_sock.h> 13b911c97cSFlorian Westphal #include <uapi/linux/mptcp.h> 1479c0949eSPeter Krystad 15cc7972eaSChristoph Paasch #define MPTCP_SUPPORTED_VERSION 1 16eda7acddSPeter Krystad 17eda7acddSPeter Krystad /* MPTCP option bits */ 18eda7acddSPeter Krystad #define OPTION_MPTCP_MPC_SYN BIT(0) 19eda7acddSPeter Krystad #define OPTION_MPTCP_MPC_SYNACK BIT(1) 20eda7acddSPeter Krystad #define OPTION_MPTCP_MPC_ACK BIT(2) 21f296234cSPeter Krystad #define OPTION_MPTCP_MPJ_SYN BIT(3) 22f296234cSPeter Krystad #define OPTION_MPTCP_MPJ_SYNACK BIT(4) 23f296234cSPeter Krystad #define OPTION_MPTCP_MPJ_ACK BIT(5) 243df523abSPeter Krystad #define OPTION_MPTCP_ADD_ADDR BIT(6) 25fef6b7ecSGeliang Tang #define OPTION_MPTCP_RM_ADDR BIT(7) 26fef6b7ecSGeliang Tang #define OPTION_MPTCP_FASTCLOSE BIT(8) 27fef6b7ecSGeliang Tang #define OPTION_MPTCP_PRIO BIT(9) 28fef6b7ecSGeliang Tang #define OPTION_MPTCP_RST BIT(10) 29eda7acddSPeter Krystad 30eda7acddSPeter Krystad /* MPTCP option subtypes */ 31eda7acddSPeter Krystad #define MPTCPOPT_MP_CAPABLE 0 32eda7acddSPeter Krystad #define MPTCPOPT_MP_JOIN 1 33eda7acddSPeter Krystad #define MPTCPOPT_DSS 2 34eda7acddSPeter Krystad #define MPTCPOPT_ADD_ADDR 3 35eda7acddSPeter Krystad #define MPTCPOPT_RM_ADDR 4 36eda7acddSPeter Krystad #define MPTCPOPT_MP_PRIO 5 37eda7acddSPeter Krystad #define MPTCPOPT_MP_FAIL 6 38eda7acddSPeter Krystad #define MPTCPOPT_MP_FASTCLOSE 7 39dc87efdbSFlorian Westphal #define MPTCPOPT_RST 8 40eda7acddSPeter Krystad 41eda7acddSPeter Krystad /* MPTCP suboption lengths */ 42cc7972eaSChristoph Paasch #define TCPOLEN_MPTCP_MPC_SYN 4 43eda7acddSPeter Krystad #define TCPOLEN_MPTCP_MPC_SYNACK 12 44eda7acddSPeter Krystad #define TCPOLEN_MPTCP_MPC_ACK 20 45cc7972eaSChristoph Paasch #define TCPOLEN_MPTCP_MPC_ACK_DATA 22 46f296234cSPeter Krystad #define TCPOLEN_MPTCP_MPJ_SYN 12 47f296234cSPeter Krystad #define TCPOLEN_MPTCP_MPJ_SYNACK 16 48f296234cSPeter Krystad #define TCPOLEN_MPTCP_MPJ_ACK 24 496d0060f6SMat Martineau #define TCPOLEN_MPTCP_DSS_BASE 4 50648ef4b8SMat Martineau #define TCPOLEN_MPTCP_DSS_ACK32 4 516d0060f6SMat Martineau #define TCPOLEN_MPTCP_DSS_ACK64 8 52648ef4b8SMat Martineau #define TCPOLEN_MPTCP_DSS_MAP32 10 536d0060f6SMat Martineau #define TCPOLEN_MPTCP_DSS_MAP64 14 546d0060f6SMat Martineau #define TCPOLEN_MPTCP_DSS_CHECKSUM 2 553df523abSPeter Krystad #define TCPOLEN_MPTCP_ADD_ADDR 16 5627ab92d9SDavide Caratti #define TCPOLEN_MPTCP_ADD_ADDR_PORT 18 573df523abSPeter Krystad #define TCPOLEN_MPTCP_ADD_ADDR_BASE 8 5827ab92d9SDavide Caratti #define TCPOLEN_MPTCP_ADD_ADDR_BASE_PORT 10 593df523abSPeter Krystad #define TCPOLEN_MPTCP_ADD_ADDR6 28 6027ab92d9SDavide Caratti #define TCPOLEN_MPTCP_ADD_ADDR6_PORT 30 613df523abSPeter Krystad #define TCPOLEN_MPTCP_ADD_ADDR6_BASE 20 6227ab92d9SDavide Caratti #define TCPOLEN_MPTCP_ADD_ADDR6_BASE_PORT 22 6327ab92d9SDavide Caratti #define TCPOLEN_MPTCP_PORT_LEN 2 6427ab92d9SDavide Caratti #define TCPOLEN_MPTCP_PORT_ALIGN 2 656445e17aSGeliang Tang #define TCPOLEN_MPTCP_RM_ADDR_BASE 3 66ec99a470SDavide Caratti #define TCPOLEN_MPTCP_PRIO 3 67ec99a470SDavide Caratti #define TCPOLEN_MPTCP_PRIO_ALIGN 4 6850c504a2SFlorian Westphal #define TCPOLEN_MPTCP_FASTCLOSE 12 69dc87efdbSFlorian Westphal #define TCPOLEN_MPTCP_RST 4 70eda7acddSPeter Krystad 71208e8f66SGeliang Tang #define TCPOLEN_MPTCP_MPC_ACK_DATA_CSUM (TCPOLEN_MPTCP_DSS_CHECKSUM + TCPOLEN_MPTCP_MPC_ACK_DATA) 72208e8f66SGeliang Tang 73ec3edaa7SPeter Krystad /* MPTCP MP_JOIN flags */ 74f296234cSPeter Krystad #define MPTCPOPT_BACKUP BIT(0) 75f296234cSPeter Krystad #define MPTCPOPT_HMAC_LEN 20 76ec3edaa7SPeter Krystad #define MPTCPOPT_THMAC_LEN 8 77f296234cSPeter Krystad 78eda7acddSPeter Krystad /* MPTCP MP_CAPABLE flags */ 79eda7acddSPeter Krystad #define MPTCP_VERSION_MASK (0x0F) 80eda7acddSPeter Krystad #define MPTCP_CAP_CHECKSUM_REQD BIT(7) 81eda7acddSPeter Krystad #define MPTCP_CAP_EXTENSIBILITY BIT(6) 8265492c5aSPaolo Abeni #define MPTCP_CAP_HMAC_SHA256 BIT(0) 83eda7acddSPeter Krystad #define MPTCP_CAP_FLAG_MASK (0x3F) 84eda7acddSPeter Krystad 856d0060f6SMat Martineau /* MPTCP DSS flags */ 866d0060f6SMat Martineau #define MPTCP_DSS_DATA_FIN BIT(4) 876d0060f6SMat Martineau #define MPTCP_DSS_DSN64 BIT(3) 886d0060f6SMat Martineau #define MPTCP_DSS_HAS_MAP BIT(2) 896d0060f6SMat Martineau #define MPTCP_DSS_ACK64 BIT(1) 906d0060f6SMat Martineau #define MPTCP_DSS_HAS_ACK BIT(0) 91648ef4b8SMat Martineau #define MPTCP_DSS_FLAG_MASK (0x1F) 92648ef4b8SMat Martineau 933df523abSPeter Krystad /* MPTCP ADD_ADDR flags */ 943df523abSPeter Krystad #define MPTCP_ADDR_ECHO BIT(0) 953df523abSPeter Krystad 9640453a5cSGeliang Tang /* MPTCP MP_PRIO flags */ 9740453a5cSGeliang Tang #define MPTCP_PRIO_BKUP BIT(0) 9840453a5cSGeliang Tang 99dc87efdbSFlorian Westphal /* MPTCP TCPRST flags */ 100dc87efdbSFlorian Westphal #define MPTCP_RST_TRANSIENT BIT(0) 101dc87efdbSFlorian Westphal 102648ef4b8SMat Martineau /* MPTCP socket flags */ 103d99bfed5SFlorian Westphal #define MPTCP_DATA_READY 0 1048edf0864SFlorian Westphal #define MPTCP_NOSPACE 1 1053b1d6210SPaolo Abeni #define MPTCP_WORK_RTX 2 10659832e24SFlorian Westphal #define MPTCP_WORK_EOF 3 107e1ff9e82SDavide Caratti #define MPTCP_FALLBACK_DONE 4 1080e4f35d7SPaolo Abeni #define MPTCP_WORK_CLOSE_SUBFLOW 5 1096e628cd3SPaolo Abeni #define MPTCP_PUSH_PENDING 6 1106e628cd3SPaolo Abeni #define MPTCP_CLEAN_UNA 7 11115cc1045SPaolo Abeni #define MPTCP_ERROR_REPORT 8 1122d6f5a2bSPaolo Abeni #define MPTCP_RETRANSMIT 9 11378962489SFlorian Westphal #define MPTCP_WORK_SYNC_SETSOCKOPT 10 1146d0060f6SMat Martineau 115eaa2ffabSPaolo Abeni static inline bool before64(__u64 seq1, __u64 seq2) 116eaa2ffabSPaolo Abeni { 117eaa2ffabSPaolo Abeni return (__s64)(seq1 - seq2) < 0; 118eaa2ffabSPaolo Abeni } 119eaa2ffabSPaolo Abeni 120eaa2ffabSPaolo Abeni #define after64(seq2, seq1) before64(seq1, seq2) 121eaa2ffabSPaolo Abeni 122cfde141eSPaolo Abeni struct mptcp_options_received { 123cfde141eSPaolo Abeni u64 sndr_key; 124cfde141eSPaolo Abeni u64 rcvr_key; 125cfde141eSPaolo Abeni u64 data_ack; 126cfde141eSPaolo Abeni u64 data_seq; 127cfde141eSPaolo Abeni u32 subflow_seq; 128cfde141eSPaolo Abeni u16 data_len; 129208e8f66SGeliang Tang __sum16 csum; 130cfde141eSPaolo Abeni u16 mp_capable : 1, 131cfde141eSPaolo Abeni mp_join : 1, 13250c504a2SFlorian Westphal fastclose : 1, 133dc87efdbSFlorian Westphal reset : 1, 134cfde141eSPaolo Abeni dss : 1, 135cfde141eSPaolo Abeni add_addr : 1, 136cfde141eSPaolo Abeni rm_addr : 1, 13740453a5cSGeliang Tang mp_prio : 1, 138cfde141eSPaolo Abeni echo : 1, 13906251181SGeliang Tang csum_reqd : 1, 140cfde141eSPaolo Abeni backup : 1; 141cfde141eSPaolo Abeni u32 token; 142cfde141eSPaolo Abeni u32 nonce; 143cfde141eSPaolo Abeni u64 thmac; 144ba34c3deSGeliang Tang u8 hmac[MPTCPOPT_HMAC_LEN]; 145cfde141eSPaolo Abeni u8 join_id; 146cfde141eSPaolo Abeni u8 use_map:1, 147cfde141eSPaolo Abeni dsn64:1, 148cfde141eSPaolo Abeni data_fin:1, 149cfde141eSPaolo Abeni use_ack:1, 150cfde141eSPaolo Abeni ack64:1, 151cfde141eSPaolo Abeni mpc_map:1, 152cfde141eSPaolo Abeni __unused:2; 153f7dafee1SGeliang Tang struct mptcp_addr_info addr; 1545c4a824dSGeliang Tang struct mptcp_rm_list rm_list; 155cfde141eSPaolo Abeni u64 ahmac; 156dc87efdbSFlorian Westphal u8 reset_reason:4; 157dc87efdbSFlorian Westphal u8 reset_transient:1; 158cfde141eSPaolo Abeni }; 159cfde141eSPaolo Abeni 1603df523abSPeter Krystad static inline __be32 mptcp_option(u8 subopt, u8 len, u8 nib, u8 field) 1613df523abSPeter Krystad { 1623df523abSPeter Krystad return htonl((TCPOPT_MPTCP << 24) | (len << 16) | (subopt << 12) | 1633df523abSPeter Krystad ((nib & 0xF) << 8) | field); 1643df523abSPeter Krystad } 1653df523abSPeter Krystad 1661b1c7a0eSPeter Krystad enum mptcp_pm_status { 1671b1c7a0eSPeter Krystad MPTCP_PM_ADD_ADDR_RECEIVED, 16884dfe367SGeliang Tang MPTCP_PM_ADD_ADDR_SEND_ACK, 169d0876b22SGeliang Tang MPTCP_PM_RM_ADDR_RECEIVED, 1701b1c7a0eSPeter Krystad MPTCP_PM_ESTABLISHED, 1715b950ff4SPaolo Abeni MPTCP_PM_ALREADY_ESTABLISHED, /* persistent status, set after ESTABLISHED event */ 1721b1c7a0eSPeter Krystad MPTCP_PM_SUBFLOW_ESTABLISHED, 1731b1c7a0eSPeter Krystad }; 1741b1c7a0eSPeter Krystad 17513ad9f01SGeliang Tang enum mptcp_addr_signal_status { 176d91d322aSGeliang Tang MPTCP_ADD_ADDR_SIGNAL, 177d91d322aSGeliang Tang MPTCP_ADD_ADDR_ECHO, 17884dfe367SGeliang Tang MPTCP_ADD_ADDR_IPV6, 1794a2777a8SGeliang Tang MPTCP_ADD_ADDR_PORT, 18042842a42SGeliang Tang MPTCP_RM_ADDR_SIGNAL, 181d91d322aSGeliang Tang }; 182d91d322aSGeliang Tang 1831b1c7a0eSPeter Krystad struct mptcp_pm_data { 1841b1c7a0eSPeter Krystad struct mptcp_addr_info local; 1851b1c7a0eSPeter Krystad struct mptcp_addr_info remote; 186b6c08380SGeliang Tang struct list_head anno_list; 1871b1c7a0eSPeter Krystad 1881b1c7a0eSPeter Krystad spinlock_t lock; /*protects the whole PM data */ 1891b1c7a0eSPeter Krystad 19013ad9f01SGeliang Tang u8 addr_signal; 1911b1c7a0eSPeter Krystad bool server_side; 1921b1c7a0eSPeter Krystad bool work_pending; 1931b1c7a0eSPeter Krystad bool accept_addr; 1941b1c7a0eSPeter Krystad bool accept_subflow; 1951b1c7a0eSPeter Krystad u8 add_addr_signaled; 1961b1c7a0eSPeter Krystad u8 add_addr_accepted; 1971b1c7a0eSPeter Krystad u8 local_addr_used; 1981b1c7a0eSPeter Krystad u8 subflows; 1991b1c7a0eSPeter Krystad u8 status; 200cbde2787SGeliang Tang struct mptcp_rm_list rm_list_tx; 201b5c55f33SGeliang Tang struct mptcp_rm_list rm_list_rx; 2021b1c7a0eSPeter Krystad }; 2031b1c7a0eSPeter Krystad 20418b683bfSPaolo Abeni struct mptcp_data_frag { 20518b683bfSPaolo Abeni struct list_head list; 20618b683bfSPaolo Abeni u64 data_seq; 207f0e6a4cfSPaolo Abeni u16 data_len; 208f0e6a4cfSPaolo Abeni u16 offset; 209f0e6a4cfSPaolo Abeni u16 overhead; 210f0e6a4cfSPaolo Abeni u16 already_sent; 21118b683bfSPaolo Abeni struct page *page; 21218b683bfSPaolo Abeni }; 21318b683bfSPaolo Abeni 214f870fa0bSMat Martineau /* MPTCP connection sock */ 215f870fa0bSMat Martineau struct mptcp_sock { 216f870fa0bSMat Martineau /* inet_connection_sock must be the first member */ 217f870fa0bSMat Martineau struct inet_connection_sock sk; 218cec37a6eSPeter Krystad u64 local_key; 219cec37a6eSPeter Krystad u64 remote_key; 2206d0060f6SMat Martineau u64 write_seq; 221eaa2ffabSPaolo Abeni u64 snd_nxt; 2226d0060f6SMat Martineau u64 ack_seq; 223fa3fe2b1SFlorian Westphal u64 rcv_wnd_sent; 2243721b9b6SMat Martineau u64 rcv_data_fin_seq; 225e93da928SPaolo Abeni int wmem_reserved; 226d5f49190SPaolo Abeni struct sock *last_snd; 227d5f49190SPaolo Abeni int snd_burst; 228ea4ca586SPaolo Abeni int old_wspace; 2297439d687SPaolo Abeni u64 snd_una; 2307439d687SPaolo Abeni u64 wnd_end; 231b51f9b80SPaolo Abeni unsigned long timer_ival; 23279c0949eSPeter Krystad u32 token; 23387952603SPaolo Abeni int rmem_released; 234648ef4b8SMat Martineau unsigned long flags; 235d22f4988SChristoph Paasch bool can_ack; 236b93df08cSPaolo Abeni bool fully_established; 2373721b9b6SMat Martineau bool rcv_data_fin; 2387279da61SMat Martineau bool snd_data_fin_enable; 23950c504a2SFlorian Westphal bool rcv_fastclose; 24037198e93SDavide Caratti bool use_64bit_ack; /* Set when we received a 64-bit DSN */ 241752e9067SGeliang Tang bool csum_enabled; 242ec3edaa7SPeter Krystad spinlock_t join_list_lock; 243ea4ca586SPaolo Abeni struct sock *ack_hint; 24480992017SPaolo Abeni struct work_struct work; 245ab174ad8SPaolo Abeni struct sk_buff *ooo_last_skb; 246ab174ad8SPaolo Abeni struct rb_root out_of_order_queue; 24787952603SPaolo Abeni struct sk_buff_head receive_queue; 248724cfd2eSPaolo Abeni int tx_pending_data; 249cec37a6eSPeter Krystad struct list_head conn_list; 25018b683bfSPaolo Abeni struct list_head rtx_queue; 251f0e6a4cfSPaolo Abeni struct mptcp_data_frag *first_pending; 252ec3edaa7SPeter Krystad struct list_head join_list; 253f870fa0bSMat Martineau struct socket *subflow; /* outgoing connect/listener/!mp_capable */ 2548ab183deSPaolo Abeni struct sock *first; 2551b1c7a0eSPeter Krystad struct mptcp_pm_data pm; 256a6b118feSFlorian Westphal struct { 257a6b118feSFlorian Westphal u32 space; /* bytes copied in last measurement window */ 258a6b118feSFlorian Westphal u32 copied; /* bytes copied in this measurement window */ 259a6b118feSFlorian Westphal u64 time; /* start time of measurement window */ 260a6b118feSFlorian Westphal u64 rtt_us; /* last maximum rtt of subflows */ 261a6b118feSFlorian Westphal } rcvq_space; 262df00b087SFlorian Westphal 263df00b087SFlorian Westphal u32 setsockopt_seq; 26420b5759fSPaolo Abeni char ca_name[TCP_CA_NAME_MAX]; 265f870fa0bSMat Martineau }; 266f870fa0bSMat Martineau 267ad80b0fcSPaolo Abeni #define mptcp_lock_sock(___sk, cb) do { \ 268ad80b0fcSPaolo Abeni struct sock *__sk = (___sk); /* silence macro reuse warning */ \ 269ad80b0fcSPaolo Abeni might_sleep(); \ 270ad80b0fcSPaolo Abeni spin_lock_bh(&__sk->sk_lock.slock); \ 271ad80b0fcSPaolo Abeni if (__sk->sk_lock.owned) \ 272ad80b0fcSPaolo Abeni __lock_sock(__sk); \ 273ad80b0fcSPaolo Abeni cb; \ 274ad80b0fcSPaolo Abeni __sk->sk_lock.owned = 1; \ 275ad80b0fcSPaolo Abeni spin_unlock(&__sk->sk_lock.slock); \ 276ad80b0fcSPaolo Abeni mutex_acquire(&__sk->sk_lock.dep_map, 0, 0, _RET_IP_); \ 277ad80b0fcSPaolo Abeni local_bh_enable(); \ 278ad80b0fcSPaolo Abeni } while (0) 279ad80b0fcSPaolo Abeni 28087952603SPaolo Abeni #define mptcp_data_lock(sk) spin_lock_bh(&(sk)->sk_lock.slock) 28187952603SPaolo Abeni #define mptcp_data_unlock(sk) spin_unlock_bh(&(sk)->sk_lock.slock) 28287952603SPaolo Abeni 283cec37a6eSPeter Krystad #define mptcp_for_each_subflow(__msk, __subflow) \ 284cec37a6eSPeter Krystad list_for_each_entry(__subflow, &((__msk)->conn_list), node) 285cec37a6eSPeter Krystad 2863abc05d9SFlorian Westphal static inline void msk_owned_by_me(const struct mptcp_sock *msk) 2873abc05d9SFlorian Westphal { 2883abc05d9SFlorian Westphal sock_owned_by_me((const struct sock *)msk); 2893abc05d9SFlorian Westphal } 2903abc05d9SFlorian Westphal 291f870fa0bSMat Martineau static inline struct mptcp_sock *mptcp_sk(const struct sock *sk) 292f870fa0bSMat Martineau { 293f870fa0bSMat Martineau return (struct mptcp_sock *)sk; 294f870fa0bSMat Martineau } 295f870fa0bSMat Martineau 296ea4ca586SPaolo Abeni static inline int __mptcp_space(const struct sock *sk) 297ea4ca586SPaolo Abeni { 298e3859603SPaolo Abeni return tcp_space(sk) + READ_ONCE(mptcp_sk(sk)->rmem_released); 299ea4ca586SPaolo Abeni } 300ea4ca586SPaolo Abeni 301f0e6a4cfSPaolo Abeni static inline struct mptcp_data_frag *mptcp_send_head(const struct sock *sk) 302f0e6a4cfSPaolo Abeni { 303f0e6a4cfSPaolo Abeni const struct mptcp_sock *msk = mptcp_sk(sk); 304f0e6a4cfSPaolo Abeni 305f0e6a4cfSPaolo Abeni return READ_ONCE(msk->first_pending); 306f0e6a4cfSPaolo Abeni } 307f0e6a4cfSPaolo Abeni 308f0e6a4cfSPaolo Abeni static inline struct mptcp_data_frag *mptcp_send_next(struct sock *sk) 309f0e6a4cfSPaolo Abeni { 310f0e6a4cfSPaolo Abeni struct mptcp_sock *msk = mptcp_sk(sk); 311f0e6a4cfSPaolo Abeni struct mptcp_data_frag *cur; 312f0e6a4cfSPaolo Abeni 313f0e6a4cfSPaolo Abeni cur = msk->first_pending; 314f0e6a4cfSPaolo Abeni return list_is_last(&cur->list, &msk->rtx_queue) ? NULL : 315f0e6a4cfSPaolo Abeni list_next_entry(cur, list); 316f0e6a4cfSPaolo Abeni } 317f0e6a4cfSPaolo Abeni 318f0e6a4cfSPaolo Abeni static inline struct mptcp_data_frag *mptcp_pending_tail(const struct sock *sk) 319f0e6a4cfSPaolo Abeni { 320f0e6a4cfSPaolo Abeni struct mptcp_sock *msk = mptcp_sk(sk); 321f0e6a4cfSPaolo Abeni 322f0e6a4cfSPaolo Abeni if (!msk->first_pending) 323f0e6a4cfSPaolo Abeni return NULL; 324f0e6a4cfSPaolo Abeni 325f0e6a4cfSPaolo Abeni if (WARN_ON_ONCE(list_empty(&msk->rtx_queue))) 326f0e6a4cfSPaolo Abeni return NULL; 327f0e6a4cfSPaolo Abeni 328f0e6a4cfSPaolo Abeni return list_last_entry(&msk->rtx_queue, struct mptcp_data_frag, list); 329f0e6a4cfSPaolo Abeni } 330f0e6a4cfSPaolo Abeni 3317948f6ccSFlorian Westphal static inline struct mptcp_data_frag *mptcp_rtx_head(const struct sock *sk) 3327948f6ccSFlorian Westphal { 3337948f6ccSFlorian Westphal struct mptcp_sock *msk = mptcp_sk(sk); 3347948f6ccSFlorian Westphal 33564b9cea7SPaolo Abeni if (msk->snd_una == READ_ONCE(msk->snd_nxt)) 33664b9cea7SPaolo Abeni return NULL; 33764b9cea7SPaolo Abeni 338a386bc5bSGeliang Tang return list_first_entry_or_null(&msk->rtx_queue, struct mptcp_data_frag, list); 3397948f6ccSFlorian Westphal } 3407948f6ccSFlorian Westphal 341d0cc2987SGeliang Tang struct csum_pseudo_header { 342d0cc2987SGeliang Tang __be64 data_seq; 343d0cc2987SGeliang Tang __be32 subflow_seq; 344d0cc2987SGeliang Tang __be16 data_len; 345d0cc2987SGeliang Tang __sum16 csum; 346d0cc2987SGeliang Tang }; 347d0cc2987SGeliang Tang 348cec37a6eSPeter Krystad struct mptcp_subflow_request_sock { 349cec37a6eSPeter Krystad struct tcp_request_sock sk; 350d22f4988SChristoph Paasch u16 mp_capable : 1, 351cec37a6eSPeter Krystad mp_join : 1, 35206fe1719SGeliang Tang backup : 1, 35306fe1719SGeliang Tang csum_reqd : 1; 3541b1c7a0eSPeter Krystad u8 local_id; 355f296234cSPeter Krystad u8 remote_id; 356cec37a6eSPeter Krystad u64 local_key; 35779c0949eSPeter Krystad u64 idsn; 35879c0949eSPeter Krystad u32 token; 359648ef4b8SMat Martineau u32 ssn_offset; 360f296234cSPeter Krystad u64 thmac; 361f296234cSPeter Krystad u32 local_nonce; 362f296234cSPeter Krystad u32 remote_nonce; 3638fd4de12SPaolo Abeni struct mptcp_sock *msk; 3642c5ebd00SPaolo Abeni struct hlist_nulls_node token_node; 365cec37a6eSPeter Krystad }; 366cec37a6eSPeter Krystad 367cec37a6eSPeter Krystad static inline struct mptcp_subflow_request_sock * 368cec37a6eSPeter Krystad mptcp_subflow_rsk(const struct request_sock *rsk) 369cec37a6eSPeter Krystad { 370cec37a6eSPeter Krystad return (struct mptcp_subflow_request_sock *)rsk; 371cec37a6eSPeter Krystad } 372cec37a6eSPeter Krystad 3736719331cSPaolo Abeni enum mptcp_data_avail { 3746719331cSPaolo Abeni MPTCP_SUBFLOW_NODATA, 3756719331cSPaolo Abeni MPTCP_SUBFLOW_DATA_AVAIL, 3766719331cSPaolo Abeni }; 3776719331cSPaolo Abeni 378b19bc294SPaolo Abeni struct mptcp_delegated_action { 379b19bc294SPaolo Abeni struct napi_struct napi; 380b19bc294SPaolo Abeni struct list_head head; 381b19bc294SPaolo Abeni }; 382b19bc294SPaolo Abeni 383b19bc294SPaolo Abeni DECLARE_PER_CPU(struct mptcp_delegated_action, mptcp_delegated_actions); 384b19bc294SPaolo Abeni 385b19bc294SPaolo Abeni #define MPTCP_DELEGATE_SEND 0 386b19bc294SPaolo Abeni 3872303f994SPeter Krystad /* MPTCP subflow context */ 3882303f994SPeter Krystad struct mptcp_subflow_context { 389cec37a6eSPeter Krystad struct list_head node;/* conn_list of subflows */ 390cec37a6eSPeter Krystad u64 local_key; 391cec37a6eSPeter Krystad u64 remote_key; 39279c0949eSPeter Krystad u64 idsn; 393648ef4b8SMat Martineau u64 map_seq; 394cc7972eaSChristoph Paasch u32 snd_isn; 39579c0949eSPeter Krystad u32 token; 3966d0060f6SMat Martineau u32 rel_write_seq; 397648ef4b8SMat Martineau u32 map_subflow_seq; 398648ef4b8SMat Martineau u32 ssn_offset; 399648ef4b8SMat Martineau u32 map_data_len; 400dd8bcd17SPaolo Abeni __wsum map_data_csum; 401dd8bcd17SPaolo Abeni u32 map_csum_len; 402cec37a6eSPeter Krystad u32 request_mptcp : 1, /* send MP_CAPABLE */ 403ec3edaa7SPeter Krystad request_join : 1, /* send MP_JOIN */ 404ec3edaa7SPeter Krystad request_bkup : 1, 405cec37a6eSPeter Krystad mp_capable : 1, /* remote is MPTCP capable */ 406f296234cSPeter Krystad mp_join : 1, /* remote is JOINing */ 4070be534f5SPaolo Abeni fully_established : 1, /* path validated */ 408f296234cSPeter Krystad pm_notified : 1, /* PM hook called for established status */ 409648ef4b8SMat Martineau conn_finished : 1, 410648ef4b8SMat Martineau map_valid : 1, 411dd8bcd17SPaolo Abeni map_csum_reqd : 1, 412dd8bcd17SPaolo Abeni map_data_fin : 1, 413d22f4988SChristoph Paasch mpc_map : 1, 414f296234cSPeter Krystad backup : 1, 41506706542SGeliang Tang send_mp_prio : 1, 416d22f4988SChristoph Paasch rx_eof : 1, 417e16163b6SPaolo Abeni can_ack : 1, /* only after processing the remote a key */ 418e16163b6SPaolo Abeni disposable : 1; /* ctx can be free at ulp release time */ 4196719331cSPaolo Abeni enum mptcp_data_avail data_avail; 420f296234cSPeter Krystad u32 remote_nonce; 421f296234cSPeter Krystad u64 thmac; 422f296234cSPeter Krystad u32 local_nonce; 423ec3edaa7SPeter Krystad u32 remote_token; 424ec3edaa7SPeter Krystad u8 hmac[MPTCPOPT_HMAC_LEN]; 425f296234cSPeter Krystad u8 local_id; 426f296234cSPeter Krystad u8 remote_id; 427dc87efdbSFlorian Westphal u8 reset_seen:1; 428dc87efdbSFlorian Westphal u8 reset_transient:1; 429dc87efdbSFlorian Westphal u8 reset_reason:4; 430648ef4b8SMat Martineau 431b19bc294SPaolo Abeni long delegated_status; 432b19bc294SPaolo Abeni struct list_head delegated_node; /* link into delegated_action, protected by local BH */ 433b19bc294SPaolo Abeni 434df00b087SFlorian Westphal u32 setsockopt_seq; 435df00b087SFlorian Westphal 4362303f994SPeter Krystad struct sock *tcp_sock; /* tcp sk backpointer */ 4372303f994SPeter Krystad struct sock *conn; /* parent mptcp_sock */ 438cec37a6eSPeter Krystad const struct inet_connection_sock_af_ops *icsk_af_ops; 439648ef4b8SMat Martineau void (*tcp_data_ready)(struct sock *sk); 440648ef4b8SMat Martineau void (*tcp_state_change)(struct sock *sk); 441648ef4b8SMat Martineau void (*tcp_write_space)(struct sock *sk); 44215cc1045SPaolo Abeni void (*tcp_error_report)(struct sock *sk); 443648ef4b8SMat Martineau 4442303f994SPeter Krystad struct rcu_head rcu; 4452303f994SPeter Krystad }; 4462303f994SPeter Krystad 4472303f994SPeter Krystad static inline struct mptcp_subflow_context * 4482303f994SPeter Krystad mptcp_subflow_ctx(const struct sock *sk) 4492303f994SPeter Krystad { 4502303f994SPeter Krystad struct inet_connection_sock *icsk = inet_csk(sk); 4512303f994SPeter Krystad 4522303f994SPeter Krystad /* Use RCU on icsk_ulp_data only for sock diag code */ 4532303f994SPeter Krystad return (__force struct mptcp_subflow_context *)icsk->icsk_ulp_data; 4542303f994SPeter Krystad } 4552303f994SPeter Krystad 4562303f994SPeter Krystad static inline struct sock * 4572303f994SPeter Krystad mptcp_subflow_tcp_sock(const struct mptcp_subflow_context *subflow) 4582303f994SPeter Krystad { 4592303f994SPeter Krystad return subflow->tcp_sock; 4602303f994SPeter Krystad } 4612303f994SPeter Krystad 462648ef4b8SMat Martineau static inline u64 463648ef4b8SMat Martineau mptcp_subflow_get_map_offset(const struct mptcp_subflow_context *subflow) 464648ef4b8SMat Martineau { 465648ef4b8SMat Martineau return tcp_sk(mptcp_subflow_tcp_sock(subflow))->copied_seq - 466648ef4b8SMat Martineau subflow->ssn_offset - 467648ef4b8SMat Martineau subflow->map_subflow_seq; 468648ef4b8SMat Martineau } 469648ef4b8SMat Martineau 470648ef4b8SMat Martineau static inline u64 471648ef4b8SMat Martineau mptcp_subflow_get_mapped_dsn(const struct mptcp_subflow_context *subflow) 472648ef4b8SMat Martineau { 473648ef4b8SMat Martineau return subflow->map_seq + mptcp_subflow_get_map_offset(subflow); 474648ef4b8SMat Martineau } 475648ef4b8SMat Martineau 4760397c6d8SPaolo Abeni static inline void mptcp_add_pending_subflow(struct mptcp_sock *msk, 4770397c6d8SPaolo Abeni struct mptcp_subflow_context *subflow) 4780397c6d8SPaolo Abeni { 4790397c6d8SPaolo Abeni sock_hold(mptcp_subflow_tcp_sock(subflow)); 4800397c6d8SPaolo Abeni spin_lock_bh(&msk->join_list_lock); 4810397c6d8SPaolo Abeni list_add_tail(&subflow->node, &msk->join_list); 4820397c6d8SPaolo Abeni spin_unlock_bh(&msk->join_list_lock); 4830397c6d8SPaolo Abeni } 4840397c6d8SPaolo Abeni 485b19bc294SPaolo Abeni void mptcp_subflow_process_delegated(struct sock *ssk); 486b19bc294SPaolo Abeni 487b19bc294SPaolo Abeni static inline void mptcp_subflow_delegate(struct mptcp_subflow_context *subflow) 488b19bc294SPaolo Abeni { 489b19bc294SPaolo Abeni struct mptcp_delegated_action *delegated; 490b19bc294SPaolo Abeni bool schedule; 491b19bc294SPaolo Abeni 492b19bc294SPaolo Abeni /* The implied barrier pairs with mptcp_subflow_delegated_done(), and 493b19bc294SPaolo Abeni * ensures the below list check sees list updates done prior to status 494b19bc294SPaolo Abeni * bit changes 495b19bc294SPaolo Abeni */ 496b19bc294SPaolo Abeni if (!test_and_set_bit(MPTCP_DELEGATE_SEND, &subflow->delegated_status)) { 497b19bc294SPaolo Abeni /* still on delegated list from previous scheduling */ 498b19bc294SPaolo Abeni if (!list_empty(&subflow->delegated_node)) 499b19bc294SPaolo Abeni return; 500b19bc294SPaolo Abeni 501b19bc294SPaolo Abeni /* the caller held the subflow bh socket lock */ 502b19bc294SPaolo Abeni lockdep_assert_in_softirq(); 503b19bc294SPaolo Abeni 504b19bc294SPaolo Abeni delegated = this_cpu_ptr(&mptcp_delegated_actions); 505b19bc294SPaolo Abeni schedule = list_empty(&delegated->head); 506b19bc294SPaolo Abeni list_add_tail(&subflow->delegated_node, &delegated->head); 507b19bc294SPaolo Abeni sock_hold(mptcp_subflow_tcp_sock(subflow)); 508b19bc294SPaolo Abeni if (schedule) 509b19bc294SPaolo Abeni napi_schedule(&delegated->napi); 510b19bc294SPaolo Abeni } 511b19bc294SPaolo Abeni } 512b19bc294SPaolo Abeni 513b19bc294SPaolo Abeni static inline struct mptcp_subflow_context * 514b19bc294SPaolo Abeni mptcp_subflow_delegated_next(struct mptcp_delegated_action *delegated) 515b19bc294SPaolo Abeni { 516b19bc294SPaolo Abeni struct mptcp_subflow_context *ret; 517b19bc294SPaolo Abeni 518b19bc294SPaolo Abeni if (list_empty(&delegated->head)) 519b19bc294SPaolo Abeni return NULL; 520b19bc294SPaolo Abeni 521b19bc294SPaolo Abeni ret = list_first_entry(&delegated->head, struct mptcp_subflow_context, delegated_node); 522b19bc294SPaolo Abeni list_del_init(&ret->delegated_node); 523b19bc294SPaolo Abeni return ret; 524b19bc294SPaolo Abeni } 525b19bc294SPaolo Abeni 526b19bc294SPaolo Abeni static inline bool mptcp_subflow_has_delegated_action(const struct mptcp_subflow_context *subflow) 527b19bc294SPaolo Abeni { 528b19bc294SPaolo Abeni return test_bit(MPTCP_DELEGATE_SEND, &subflow->delegated_status); 529b19bc294SPaolo Abeni } 530b19bc294SPaolo Abeni 531b19bc294SPaolo Abeni static inline void mptcp_subflow_delegated_done(struct mptcp_subflow_context *subflow) 532b19bc294SPaolo Abeni { 533b19bc294SPaolo Abeni /* pairs with mptcp_subflow_delegate, ensures delegate_node is updated before 534b19bc294SPaolo Abeni * touching the status bit 535b19bc294SPaolo Abeni */ 536b19bc294SPaolo Abeni smp_wmb(); 537b19bc294SPaolo Abeni clear_bit(MPTCP_DELEGATE_SEND, &subflow->delegated_status); 538b19bc294SPaolo Abeni } 539b19bc294SPaolo Abeni 540648ef4b8SMat Martineau int mptcp_is_enabled(struct net *net); 54193f323b9SGeliang Tang unsigned int mptcp_get_add_addr_timeout(struct net *net); 542fc3c82eeSGeliang Tang int mptcp_is_checksum_enabled(struct net *net); 543*d2f77960SGeliang Tang int mptcp_allow_join_id0(struct net *net); 544b93df08cSPaolo Abeni void mptcp_subflow_fully_established(struct mptcp_subflow_context *subflow, 545b93df08cSPaolo Abeni struct mptcp_options_received *mp_opt); 546648ef4b8SMat Martineau bool mptcp_subflow_data_available(struct sock *sk); 547d39dcecaSPaolo Abeni void __init mptcp_subflow_init(void); 548d0876b22SGeliang Tang void mptcp_subflow_shutdown(struct sock *sk, struct sock *ssk, int how); 549a141e02eSFlorian Westphal void mptcp_close_ssk(struct sock *sk, struct sock *ssk, 550e16163b6SPaolo Abeni struct mptcp_subflow_context *subflow); 551d5824847SPaolo Abeni void mptcp_subflow_reset(struct sock *ssk); 552866f26f2SPaolo Abeni void mptcp_sock_graft(struct sock *sk, struct socket *parent); 5531729cf18SGeliang Tang struct socket *__mptcp_nmpc_socket(const struct mptcp_sock *msk); 554ec3edaa7SPeter Krystad 555ec3edaa7SPeter Krystad /* called with sk socket lock held */ 556ef0da3b8SPaolo Abeni int __mptcp_subflow_connect(struct sock *sk, const struct mptcp_addr_info *loc, 557daa83ab0SGeliang Tang const struct mptcp_addr_info *remote, 558daa83ab0SGeliang Tang u8 flags, int ifindex); 5592303f994SPeter Krystad int mptcp_subflow_create_socket(struct sock *sk, struct socket **new_sock); 5601729cf18SGeliang Tang void mptcp_info2sockaddr(const struct mptcp_addr_info *info, 5611729cf18SGeliang Tang struct sockaddr_storage *addr, 5621729cf18SGeliang Tang unsigned short family); 5632303f994SPeter Krystad 56443f1140bSGeliang Tang static inline bool mptcp_subflow_active(struct mptcp_subflow_context *subflow) 56543f1140bSGeliang Tang { 56643f1140bSGeliang Tang struct sock *ssk = mptcp_subflow_tcp_sock(subflow); 56743f1140bSGeliang Tang 56843f1140bSGeliang Tang /* can't send if JOIN hasn't completed yet (i.e. is usable for mptcp) */ 56943f1140bSGeliang Tang if (subflow->request_join && !subflow->fully_established) 57043f1140bSGeliang Tang return false; 57143f1140bSGeliang Tang 57243f1140bSGeliang Tang /* only send if our side has not closed yet */ 57343f1140bSGeliang Tang return ((1 << ssk->sk_state) & (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT)); 57443f1140bSGeliang Tang } 57543f1140bSGeliang Tang 576648ef4b8SMat Martineau static inline void mptcp_subflow_tcp_fallback(struct sock *sk, 577648ef4b8SMat Martineau struct mptcp_subflow_context *ctx) 578648ef4b8SMat Martineau { 579648ef4b8SMat Martineau sk->sk_data_ready = ctx->tcp_data_ready; 580648ef4b8SMat Martineau sk->sk_state_change = ctx->tcp_state_change; 581648ef4b8SMat Martineau sk->sk_write_space = ctx->tcp_write_space; 58215cc1045SPaolo Abeni sk->sk_error_report = ctx->tcp_error_report; 583648ef4b8SMat Martineau 584648ef4b8SMat Martineau inet_csk(sk)->icsk_af_ops = ctx->icsk_af_ops; 585648ef4b8SMat Martineau } 586648ef4b8SMat Martineau 587d39dcecaSPaolo Abeni void __init mptcp_proto_init(void); 588784325e9SMatthieu Baerts #if IS_ENABLED(CONFIG_MPTCP_IPV6) 589d39dcecaSPaolo Abeni int __init mptcp_proto_v6_init(void); 590784325e9SMatthieu Baerts #endif 591648ef4b8SMat Martineau 592fca5c82cSPaolo Abeni struct sock *mptcp_sk_clone(const struct sock *sk, 593cfde141eSPaolo Abeni const struct mptcp_options_received *mp_opt, 594fca5c82cSPaolo Abeni struct request_sock *req); 595c863225bSGeliang Tang void mptcp_get_options(const struct sock *sk, 596c863225bSGeliang Tang const struct sk_buff *skb, 597cfde141eSPaolo Abeni struct mptcp_options_received *mp_opt); 598cec37a6eSPeter Krystad 599cec37a6eSPeter Krystad void mptcp_finish_connect(struct sock *sk); 600b93df08cSPaolo Abeni static inline bool mptcp_is_fully_established(struct sock *sk) 601b93df08cSPaolo Abeni { 602b93df08cSPaolo Abeni return inet_sk_state_load(sk) == TCP_ESTABLISHED && 603b93df08cSPaolo Abeni READ_ONCE(mptcp_sk(sk)->fully_established); 604b93df08cSPaolo Abeni } 605a6b118feSFlorian Westphal void mptcp_rcv_space_init(struct mptcp_sock *msk, const struct sock *ssk); 6062e52213cSFlorian Westphal void mptcp_data_ready(struct sock *sk, struct sock *ssk); 607f296234cSPeter Krystad bool mptcp_finish_join(struct sock *sk); 608ba8f48f7SPaolo Abeni bool mptcp_schedule_work(struct sock *sk); 6090abdde82SPaolo Abeni int mptcp_setsockopt(struct sock *sk, int level, int optname, 6100abdde82SPaolo Abeni sockptr_t optval, unsigned int optlen); 6110abdde82SPaolo Abeni int mptcp_getsockopt(struct sock *sk, int level, int optname, 6120abdde82SPaolo Abeni char __user *optval, int __user *option); 6130abdde82SPaolo Abeni 614219d0499SPaolo Abeni void __mptcp_check_push(struct sock *sk, struct sock *ssk); 6157439d687SPaolo Abeni void __mptcp_data_acked(struct sock *sk); 61615cc1045SPaolo Abeni void __mptcp_error_report(struct sock *sk); 61759832e24SFlorian Westphal void mptcp_subflow_eof(struct sock *sk); 6181a49b2c2SMat Martineau bool mptcp_update_rcv_data_fin(struct mptcp_sock *msk, u64 data_fin_seq, bool use_64bit); 61984dfe367SGeliang Tang void __mptcp_flush_join_list(struct mptcp_sock *msk); 620e16163b6SPaolo Abeni static inline bool mptcp_data_fin_enabled(const struct mptcp_sock *msk) 621e16163b6SPaolo Abeni { 622e16163b6SPaolo Abeni return READ_ONCE(msk->snd_data_fin_enable) && 623e16163b6SPaolo Abeni READ_ONCE(msk->write_seq) == READ_ONCE(msk->snd_nxt); 624e16163b6SPaolo Abeni } 625e16163b6SPaolo Abeni 6265cf92bbaSPaolo Abeni static inline bool mptcp_propagate_sndbuf(struct sock *sk, struct sock *ssk) 6275cf92bbaSPaolo Abeni { 6285cf92bbaSPaolo Abeni if ((sk->sk_userlocks & SOCK_SNDBUF_LOCK) || ssk->sk_sndbuf <= READ_ONCE(sk->sk_sndbuf)) 6295cf92bbaSPaolo Abeni return false; 6305cf92bbaSPaolo Abeni 6315cf92bbaSPaolo Abeni WRITE_ONCE(sk->sk_sndbuf, ssk->sk_sndbuf); 6325cf92bbaSPaolo Abeni return true; 6335cf92bbaSPaolo Abeni } 6345cf92bbaSPaolo Abeni 6355cf92bbaSPaolo Abeni static inline void mptcp_write_space(struct sock *sk) 6365cf92bbaSPaolo Abeni { 6375cf92bbaSPaolo Abeni if (sk_stream_is_writeable(sk)) { 6385cf92bbaSPaolo Abeni /* pairs with memory barrier in mptcp_poll */ 6395cf92bbaSPaolo Abeni smp_mb(); 6405cf92bbaSPaolo Abeni if (test_and_clear_bit(MPTCP_NOSPACE, &mptcp_sk(sk)->flags)) 6415cf92bbaSPaolo Abeni sk_stream_write_space(sk); 6425cf92bbaSPaolo Abeni } 6435cf92bbaSPaolo Abeni } 6445cf92bbaSPaolo Abeni 6455c8c1640SGeliang Tang void mptcp_destroy_common(struct mptcp_sock *msk); 646cec37a6eSPeter Krystad 647c68a0cd1SJianguo Wu #define MPTCP_TOKEN_MAX_RETRIES 4 648c68a0cd1SJianguo Wu 6492c5ebd00SPaolo Abeni void __init mptcp_token_init(void); 6502c5ebd00SPaolo Abeni static inline void mptcp_token_init_request(struct request_sock *req) 6512c5ebd00SPaolo Abeni { 6522c5ebd00SPaolo Abeni mptcp_subflow_rsk(req)->token_node.pprev = NULL; 6532c5ebd00SPaolo Abeni } 6542c5ebd00SPaolo Abeni 65579c0949eSPeter Krystad int mptcp_token_new_request(struct request_sock *req); 6562c5ebd00SPaolo Abeni void mptcp_token_destroy_request(struct request_sock *req); 65779c0949eSPeter Krystad int mptcp_token_new_connect(struct sock *sk); 6582c5ebd00SPaolo Abeni void mptcp_token_accept(struct mptcp_subflow_request_sock *r, 6592c5ebd00SPaolo Abeni struct mptcp_sock *msk); 660c83a47e5SFlorian Westphal bool mptcp_token_exists(u32 token); 661f296234cSPeter Krystad struct mptcp_sock *mptcp_token_get_sock(u32 token); 66296d890daSPaolo Abeni struct mptcp_sock *mptcp_token_iter_next(const struct net *net, long *s_slot, 66396d890daSPaolo Abeni long *s_num); 6642c5ebd00SPaolo Abeni void mptcp_token_destroy(struct mptcp_sock *msk); 66579c0949eSPeter Krystad 66679c0949eSPeter Krystad void mptcp_crypto_key_sha(u64 key, u32 *token, u64 *idsn); 66779c0949eSPeter Krystad 6683df523abSPeter Krystad void mptcp_crypto_hmac_sha(u64 key1, u64 key2, u8 *msg, int len, void *hmac); 66979c0949eSPeter Krystad 670d39dcecaSPaolo Abeni void __init mptcp_pm_init(void); 6711b1c7a0eSPeter Krystad void mptcp_pm_data_init(struct mptcp_sock *msk); 6726c714f1bSFlorian Westphal void mptcp_pm_new_connection(struct mptcp_sock *msk, const struct sock *ssk, int server_side); 6736c714f1bSFlorian Westphal void mptcp_pm_fully_established(struct mptcp_sock *msk, const struct sock *ssk, gfp_t gfp); 6741b1c7a0eSPeter Krystad bool mptcp_pm_allow_new_subflow(struct mptcp_sock *msk); 6751b1c7a0eSPeter Krystad void mptcp_pm_connection_closed(struct mptcp_sock *msk); 67662535200SGeliang Tang void mptcp_pm_subflow_established(struct mptcp_sock *msk); 6771b1c7a0eSPeter Krystad void mptcp_pm_subflow_closed(struct mptcp_sock *msk, u8 id); 6781b1c7a0eSPeter Krystad void mptcp_pm_add_addr_received(struct mptcp_sock *msk, 6791b1c7a0eSPeter Krystad const struct mptcp_addr_info *addr); 680557963c3SGeliang Tang void mptcp_pm_add_addr_echoed(struct mptcp_sock *msk, 681557963c3SGeliang Tang struct mptcp_addr_info *addr); 68284dfe367SGeliang Tang void mptcp_pm_add_addr_send_ack(struct mptcp_sock *msk); 683b46a0238SGeliang Tang void mptcp_pm_nl_addr_send_ack(struct mptcp_sock *msk); 6845c4a824dSGeliang Tang void mptcp_pm_rm_addr_received(struct mptcp_sock *msk, 6855c4a824dSGeliang Tang const struct mptcp_rm_list *rm_list); 68640453a5cSGeliang Tang void mptcp_pm_mp_prio_received(struct sock *sk, u8 bkup); 68706706542SGeliang Tang int mptcp_pm_nl_mp_prio_send_ack(struct mptcp_sock *msk, 68806706542SGeliang Tang struct mptcp_addr_info *addr, 68906706542SGeliang Tang u8 bkup); 690b6c08380SGeliang Tang void mptcp_pm_free_anno_list(struct mptcp_sock *msk); 6915bc56388SGeliang Tang bool mptcp_pm_sport_in_anno_list(struct mptcp_sock *msk, const struct sock *sk); 69200cfd77bSGeliang Tang struct mptcp_pm_add_entry * 69300cfd77bSGeliang Tang mptcp_pm_del_add_timer(struct mptcp_sock *msk, 694d58300c3SDavide Caratti struct mptcp_addr_info *addr, bool check_id); 695d88c476fSGeliang Tang struct mptcp_pm_add_entry * 696d88c476fSGeliang Tang mptcp_lookup_anno_list_by_saddr(struct mptcp_sock *msk, 697d88c476fSGeliang Tang struct mptcp_addr_info *addr); 6981b1c7a0eSPeter Krystad 6991b1c7a0eSPeter Krystad int mptcp_pm_announce_addr(struct mptcp_sock *msk, 7006a6c05a8SGeliang Tang const struct mptcp_addr_info *addr, 701f7efc777SGeliang Tang bool echo); 702cbde2787SGeliang Tang int mptcp_pm_remove_addr(struct mptcp_sock *msk, const struct mptcp_rm_list *rm_list); 703ddd14bb8SGeliang Tang int mptcp_pm_remove_subflow(struct mptcp_sock *msk, const struct mptcp_rm_list *rm_list); 7041b1c7a0eSPeter Krystad 705b911c97cSFlorian Westphal void mptcp_event(enum mptcp_event_type type, const struct mptcp_sock *msk, 706b911c97cSFlorian Westphal const struct sock *ssk, gfp_t gfp); 707b911c97cSFlorian Westphal void mptcp_event_addr_announced(const struct mptcp_sock *msk, const struct mptcp_addr_info *info); 708b911c97cSFlorian Westphal void mptcp_event_addr_removed(const struct mptcp_sock *msk, u8 id); 709b911c97cSFlorian Westphal 710f643b803SGeliang Tang static inline bool mptcp_pm_should_add_signal(struct mptcp_sock *msk) 7111b1c7a0eSPeter Krystad { 71213ad9f01SGeliang Tang return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_SIGNAL); 713d91d322aSGeliang Tang } 714d91d322aSGeliang Tang 715d91d322aSGeliang Tang static inline bool mptcp_pm_should_add_signal_echo(struct mptcp_sock *msk) 716d91d322aSGeliang Tang { 71713ad9f01SGeliang Tang return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_ECHO); 7181b1c7a0eSPeter Krystad } 7191b1c7a0eSPeter Krystad 72084dfe367SGeliang Tang static inline bool mptcp_pm_should_add_signal_ipv6(struct mptcp_sock *msk) 72184dfe367SGeliang Tang { 72213ad9f01SGeliang Tang return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_IPV6); 72384dfe367SGeliang Tang } 72484dfe367SGeliang Tang 7254a2777a8SGeliang Tang static inline bool mptcp_pm_should_add_signal_port(struct mptcp_sock *msk) 7264a2777a8SGeliang Tang { 72713ad9f01SGeliang Tang return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_PORT); 7284a2777a8SGeliang Tang } 7294a2777a8SGeliang Tang 7305cb104aeSGeliang Tang static inline bool mptcp_pm_should_rm_signal(struct mptcp_sock *msk) 7315cb104aeSGeliang Tang { 73213ad9f01SGeliang Tang return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_RM_ADDR_SIGNAL); 7335cb104aeSGeliang Tang } 7345cb104aeSGeliang Tang 7354a2777a8SGeliang Tang static inline unsigned int mptcp_add_addr_len(int family, bool echo, bool port) 7361b1c7a0eSPeter Krystad { 7372ec72faeSGeliang Tang u8 len = TCPOLEN_MPTCP_ADD_ADDR_BASE; 7382ec72faeSGeliang Tang 7392ec72faeSGeliang Tang if (family == AF_INET6) 7402ec72faeSGeliang Tang len = TCPOLEN_MPTCP_ADD_ADDR6_BASE; 7412ec72faeSGeliang Tang if (!echo) 7422ec72faeSGeliang Tang len += MPTCPOPT_THMAC_LEN; 74327ab92d9SDavide Caratti /* account for 2 trailing 'nop' options */ 7444a2777a8SGeliang Tang if (port) 74527ab92d9SDavide Caratti len += TCPOLEN_MPTCP_PORT_LEN + TCPOLEN_MPTCP_PORT_ALIGN; 7462ec72faeSGeliang Tang 7472ec72faeSGeliang Tang return len; 7481b1c7a0eSPeter Krystad } 7491b1c7a0eSPeter Krystad 7506445e17aSGeliang Tang static inline int mptcp_rm_addr_len(const struct mptcp_rm_list *rm_list) 7516445e17aSGeliang Tang { 7526445e17aSGeliang Tang if (rm_list->nr == 0 || rm_list->nr > MPTCP_RM_IDS_MAX) 7536445e17aSGeliang Tang return -EINVAL; 7546445e17aSGeliang Tang 7556445e17aSGeliang Tang return TCPOLEN_MPTCP_RM_ADDR_BASE + roundup(rm_list->nr - 1, 4) + 1; 7566445e17aSGeliang Tang } 7576445e17aSGeliang Tang 758f643b803SGeliang Tang bool mptcp_pm_add_addr_signal(struct mptcp_sock *msk, unsigned int remaining, 7594a2777a8SGeliang Tang struct mptcp_addr_info *saddr, bool *echo, bool *port); 7605cb104aeSGeliang Tang bool mptcp_pm_rm_addr_signal(struct mptcp_sock *msk, unsigned int remaining, 7616445e17aSGeliang Tang struct mptcp_rm_list *rm_list); 7621b1c7a0eSPeter Krystad int mptcp_pm_get_local_id(struct mptcp_sock *msk, struct sock_common *skc); 7631b1c7a0eSPeter Krystad 764d39dcecaSPaolo Abeni void __init mptcp_pm_nl_init(void); 76501cacb00SPaolo Abeni void mptcp_pm_nl_data_init(struct mptcp_sock *msk); 766e9801430SFlorian Westphal void mptcp_pm_nl_work(struct mptcp_sock *msk); 767ddd14bb8SGeliang Tang void mptcp_pm_nl_rm_subflow_received(struct mptcp_sock *msk, 768ddd14bb8SGeliang Tang const struct mptcp_rm_list *rm_list); 76901cacb00SPaolo Abeni int mptcp_pm_nl_get_local_id(struct mptcp_sock *msk, struct sock_common *skc); 770a914e586SGeliang Tang unsigned int mptcp_pm_get_add_addr_signal_max(struct mptcp_sock *msk); 771a914e586SGeliang Tang unsigned int mptcp_pm_get_add_addr_accept_max(struct mptcp_sock *msk); 772a914e586SGeliang Tang unsigned int mptcp_pm_get_subflows_max(struct mptcp_sock *msk); 7730caf3adaSGeliang Tang unsigned int mptcp_pm_get_local_addr_max(struct mptcp_sock *msk); 77401cacb00SPaolo Abeni 77578962489SFlorian Westphal int mptcp_setsockopt(struct sock *sk, int level, int optname, 77678962489SFlorian Westphal sockptr_t optval, unsigned int optlen); 77778962489SFlorian Westphal 77878962489SFlorian Westphal void mptcp_sockopt_sync(struct mptcp_sock *msk, struct sock *ssk); 77978962489SFlorian Westphal void mptcp_sockopt_sync_all(struct mptcp_sock *msk); 78078962489SFlorian Westphal 781dc87efdbSFlorian Westphal static inline struct mptcp_ext *mptcp_get_ext(const struct sk_buff *skb) 7826d0060f6SMat Martineau { 7836d0060f6SMat Martineau return (struct mptcp_ext *)skb_ext_find(skb, SKB_EXT_MPTCP); 7846d0060f6SMat Martineau } 7856d0060f6SMat Martineau 7865147dfb5SDavide Caratti void mptcp_diag_subflow_init(struct tcp_ulp_ops *ops); 7875147dfb5SDavide Caratti 788d5f49190SPaolo Abeni static inline bool __mptcp_check_fallback(const struct mptcp_sock *msk) 789e1ff9e82SDavide Caratti { 790e1ff9e82SDavide Caratti return test_bit(MPTCP_FALLBACK_DONE, &msk->flags); 791e1ff9e82SDavide Caratti } 792e1ff9e82SDavide Caratti 793d5f49190SPaolo Abeni static inline bool mptcp_check_fallback(const struct sock *sk) 794e1ff9e82SDavide Caratti { 795e1ff9e82SDavide Caratti struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); 796e1ff9e82SDavide Caratti struct mptcp_sock *msk = mptcp_sk(subflow->conn); 797e1ff9e82SDavide Caratti 798e1ff9e82SDavide Caratti return __mptcp_check_fallback(msk); 799e1ff9e82SDavide Caratti } 800e1ff9e82SDavide Caratti 801e1ff9e82SDavide Caratti static inline void __mptcp_do_fallback(struct mptcp_sock *msk) 802e1ff9e82SDavide Caratti { 803e1ff9e82SDavide Caratti if (test_bit(MPTCP_FALLBACK_DONE, &msk->flags)) { 804e1ff9e82SDavide Caratti pr_debug("TCP fallback already done (msk=%p)", msk); 805e1ff9e82SDavide Caratti return; 806e1ff9e82SDavide Caratti } 807e1ff9e82SDavide Caratti set_bit(MPTCP_FALLBACK_DONE, &msk->flags); 808e1ff9e82SDavide Caratti } 809e1ff9e82SDavide Caratti 810e1ff9e82SDavide Caratti static inline void mptcp_do_fallback(struct sock *sk) 811e1ff9e82SDavide Caratti { 812e1ff9e82SDavide Caratti struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); 813e1ff9e82SDavide Caratti struct mptcp_sock *msk = mptcp_sk(subflow->conn); 814e1ff9e82SDavide Caratti 815e1ff9e82SDavide Caratti __mptcp_do_fallback(msk); 816e1ff9e82SDavide Caratti } 817e1ff9e82SDavide Caratti 818e1ff9e82SDavide Caratti #define pr_fallback(a) pr_debug("%s:fallback to TCP (msk=%p)", __func__, a) 819e1ff9e82SDavide Caratti 8208fd73804SDavide Caratti static inline bool subflow_simultaneous_connect(struct sock *sk) 8218fd73804SDavide Caratti { 8228fd73804SDavide Caratti struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); 8238fd73804SDavide Caratti struct sock *parent = subflow->conn; 8248fd73804SDavide Caratti 8258fd73804SDavide Caratti return sk->sk_state == TCP_ESTABLISHED && 8268fd73804SDavide Caratti !mptcp_sk(parent)->pm.server_side && 8278fd73804SDavide Caratti !subflow->conn_finished; 8288fd73804SDavide Caratti } 8298fd73804SDavide Caratti 8309466a1ccSFlorian Westphal #ifdef CONFIG_SYN_COOKIES 8319466a1ccSFlorian Westphal void subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req, 8329466a1ccSFlorian Westphal struct sk_buff *skb); 8339466a1ccSFlorian Westphal bool mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req, 8349466a1ccSFlorian Westphal struct sk_buff *skb); 8359466a1ccSFlorian Westphal void __init mptcp_join_cookie_init(void); 8369466a1ccSFlorian Westphal #else 8379466a1ccSFlorian Westphal static inline void 8389466a1ccSFlorian Westphal subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req, 8399466a1ccSFlorian Westphal struct sk_buff *skb) {} 8409466a1ccSFlorian Westphal static inline bool 8419466a1ccSFlorian Westphal mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req, 8429466a1ccSFlorian Westphal struct sk_buff *skb) 8439466a1ccSFlorian Westphal { 8449466a1ccSFlorian Westphal return false; 8459466a1ccSFlorian Westphal } 8469466a1ccSFlorian Westphal 8479466a1ccSFlorian Westphal static inline void mptcp_join_cookie_init(void) {} 8489466a1ccSFlorian Westphal #endif 8499466a1ccSFlorian Westphal 850f870fa0bSMat Martineau #endif /* __MPTCP_PROTOCOL_H */ 851