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) 82bab6b88eSGeliang Tang #define MPTCP_CAP_DENY_JOIN_ID0 BIT(5) 8365492c5aSPaolo Abeni #define MPTCP_CAP_HMAC_SHA256 BIT(0) 84bab6b88eSGeliang Tang #define MPTCP_CAP_FLAG_MASK (0x1F) 85eda7acddSPeter Krystad 866d0060f6SMat Martineau /* MPTCP DSS flags */ 876d0060f6SMat Martineau #define MPTCP_DSS_DATA_FIN BIT(4) 886d0060f6SMat Martineau #define MPTCP_DSS_DSN64 BIT(3) 896d0060f6SMat Martineau #define MPTCP_DSS_HAS_MAP BIT(2) 906d0060f6SMat Martineau #define MPTCP_DSS_ACK64 BIT(1) 916d0060f6SMat Martineau #define MPTCP_DSS_HAS_ACK BIT(0) 92648ef4b8SMat Martineau #define MPTCP_DSS_FLAG_MASK (0x1F) 93648ef4b8SMat Martineau 943df523abSPeter Krystad /* MPTCP ADD_ADDR flags */ 953df523abSPeter Krystad #define MPTCP_ADDR_ECHO BIT(0) 963df523abSPeter Krystad 9740453a5cSGeliang Tang /* MPTCP MP_PRIO flags */ 9840453a5cSGeliang Tang #define MPTCP_PRIO_BKUP BIT(0) 9940453a5cSGeliang Tang 100dc87efdbSFlorian Westphal /* MPTCP TCPRST flags */ 101dc87efdbSFlorian Westphal #define MPTCP_RST_TRANSIENT BIT(0) 102dc87efdbSFlorian Westphal 103648ef4b8SMat Martineau /* MPTCP socket flags */ 104d99bfed5SFlorian Westphal #define MPTCP_DATA_READY 0 1058edf0864SFlorian Westphal #define MPTCP_NOSPACE 1 1063b1d6210SPaolo Abeni #define MPTCP_WORK_RTX 2 10759832e24SFlorian Westphal #define MPTCP_WORK_EOF 3 108e1ff9e82SDavide Caratti #define MPTCP_FALLBACK_DONE 4 1090e4f35d7SPaolo Abeni #define MPTCP_WORK_CLOSE_SUBFLOW 5 1106e628cd3SPaolo Abeni #define MPTCP_PUSH_PENDING 6 1116e628cd3SPaolo Abeni #define MPTCP_CLEAN_UNA 7 11215cc1045SPaolo Abeni #define MPTCP_ERROR_REPORT 8 1132d6f5a2bSPaolo Abeni #define MPTCP_RETRANSMIT 9 11478962489SFlorian Westphal #define MPTCP_WORK_SYNC_SETSOCKOPT 10 115490274b4SPaolo Abeni #define MPTCP_CONNECTED 11 1166d0060f6SMat Martineau 117eaa2ffabSPaolo Abeni static inline bool before64(__u64 seq1, __u64 seq2) 118eaa2ffabSPaolo Abeni { 119eaa2ffabSPaolo Abeni return (__s64)(seq1 - seq2) < 0; 120eaa2ffabSPaolo Abeni } 121eaa2ffabSPaolo Abeni 122eaa2ffabSPaolo Abeni #define after64(seq2, seq1) before64(seq1, seq2) 123eaa2ffabSPaolo Abeni 124cfde141eSPaolo Abeni struct mptcp_options_received { 125cfde141eSPaolo Abeni u64 sndr_key; 126cfde141eSPaolo Abeni u64 rcvr_key; 127cfde141eSPaolo Abeni u64 data_ack; 128cfde141eSPaolo Abeni u64 data_seq; 129cfde141eSPaolo Abeni u32 subflow_seq; 130cfde141eSPaolo Abeni u16 data_len; 131208e8f66SGeliang Tang __sum16 csum; 132cfde141eSPaolo Abeni u16 mp_capable : 1, 133cfde141eSPaolo Abeni mp_join : 1, 13450c504a2SFlorian Westphal fastclose : 1, 135dc87efdbSFlorian Westphal reset : 1, 136cfde141eSPaolo Abeni dss : 1, 137cfde141eSPaolo Abeni add_addr : 1, 138cfde141eSPaolo Abeni rm_addr : 1, 13940453a5cSGeliang Tang mp_prio : 1, 140cfde141eSPaolo Abeni echo : 1, 14106251181SGeliang Tang csum_reqd : 1, 142df377be3SGeliang Tang backup : 1, 143df377be3SGeliang Tang deny_join_id0 : 1; 144cfde141eSPaolo Abeni u32 token; 145cfde141eSPaolo Abeni u32 nonce; 146cfde141eSPaolo Abeni u64 thmac; 147ba34c3deSGeliang Tang u8 hmac[MPTCPOPT_HMAC_LEN]; 148cfde141eSPaolo Abeni u8 join_id; 149cfde141eSPaolo Abeni u8 use_map:1, 150cfde141eSPaolo Abeni dsn64:1, 151cfde141eSPaolo Abeni data_fin:1, 152cfde141eSPaolo Abeni use_ack:1, 153cfde141eSPaolo Abeni ack64:1, 154cfde141eSPaolo Abeni mpc_map:1, 155cfde141eSPaolo Abeni __unused:2; 156f7dafee1SGeliang Tang struct mptcp_addr_info addr; 1575c4a824dSGeliang Tang struct mptcp_rm_list rm_list; 158cfde141eSPaolo Abeni u64 ahmac; 159dc87efdbSFlorian Westphal u8 reset_reason:4; 160dc87efdbSFlorian Westphal u8 reset_transient:1; 161cfde141eSPaolo Abeni }; 162cfde141eSPaolo Abeni 1633df523abSPeter Krystad static inline __be32 mptcp_option(u8 subopt, u8 len, u8 nib, u8 field) 1643df523abSPeter Krystad { 1653df523abSPeter Krystad return htonl((TCPOPT_MPTCP << 24) | (len << 16) | (subopt << 12) | 1663df523abSPeter Krystad ((nib & 0xF) << 8) | field); 1673df523abSPeter Krystad } 1683df523abSPeter Krystad 1691b1c7a0eSPeter Krystad enum mptcp_pm_status { 1701b1c7a0eSPeter Krystad MPTCP_PM_ADD_ADDR_RECEIVED, 17184dfe367SGeliang Tang MPTCP_PM_ADD_ADDR_SEND_ACK, 172d0876b22SGeliang Tang MPTCP_PM_RM_ADDR_RECEIVED, 1731b1c7a0eSPeter Krystad MPTCP_PM_ESTABLISHED, 1745b950ff4SPaolo Abeni MPTCP_PM_ALREADY_ESTABLISHED, /* persistent status, set after ESTABLISHED event */ 1751b1c7a0eSPeter Krystad MPTCP_PM_SUBFLOW_ESTABLISHED, 1761b1c7a0eSPeter Krystad }; 1771b1c7a0eSPeter Krystad 17813ad9f01SGeliang Tang enum mptcp_addr_signal_status { 179d91d322aSGeliang Tang MPTCP_ADD_ADDR_SIGNAL, 180d91d322aSGeliang Tang MPTCP_ADD_ADDR_ECHO, 18184dfe367SGeliang Tang MPTCP_ADD_ADDR_IPV6, 1824a2777a8SGeliang Tang MPTCP_ADD_ADDR_PORT, 18342842a42SGeliang Tang MPTCP_RM_ADDR_SIGNAL, 184d91d322aSGeliang Tang }; 185d91d322aSGeliang Tang 1861b1c7a0eSPeter Krystad struct mptcp_pm_data { 1871b1c7a0eSPeter Krystad struct mptcp_addr_info local; 1881b1c7a0eSPeter Krystad struct mptcp_addr_info remote; 189b6c08380SGeliang Tang struct list_head anno_list; 1901b1c7a0eSPeter Krystad 1911b1c7a0eSPeter Krystad spinlock_t lock; /*protects the whole PM data */ 1921b1c7a0eSPeter Krystad 19313ad9f01SGeliang Tang u8 addr_signal; 1941b1c7a0eSPeter Krystad bool server_side; 1951b1c7a0eSPeter Krystad bool work_pending; 1961b1c7a0eSPeter Krystad bool accept_addr; 1971b1c7a0eSPeter Krystad bool accept_subflow; 198df377be3SGeliang Tang bool remote_deny_join_id0; 1991b1c7a0eSPeter Krystad u8 add_addr_signaled; 2001b1c7a0eSPeter Krystad u8 add_addr_accepted; 2011b1c7a0eSPeter Krystad u8 local_addr_used; 2021b1c7a0eSPeter Krystad u8 subflows; 2031b1c7a0eSPeter Krystad u8 status; 204cbde2787SGeliang Tang struct mptcp_rm_list rm_list_tx; 205b5c55f33SGeliang Tang struct mptcp_rm_list rm_list_rx; 2061b1c7a0eSPeter Krystad }; 2071b1c7a0eSPeter Krystad 20818b683bfSPaolo Abeni struct mptcp_data_frag { 20918b683bfSPaolo Abeni struct list_head list; 21018b683bfSPaolo Abeni u64 data_seq; 211f0e6a4cfSPaolo Abeni u16 data_len; 212f0e6a4cfSPaolo Abeni u16 offset; 213f0e6a4cfSPaolo Abeni u16 overhead; 214f0e6a4cfSPaolo Abeni u16 already_sent; 21518b683bfSPaolo Abeni struct page *page; 21618b683bfSPaolo Abeni }; 21718b683bfSPaolo Abeni 218f870fa0bSMat Martineau /* MPTCP connection sock */ 219f870fa0bSMat Martineau struct mptcp_sock { 220f870fa0bSMat Martineau /* inet_connection_sock must be the first member */ 221f870fa0bSMat Martineau struct inet_connection_sock sk; 222cec37a6eSPeter Krystad u64 local_key; 223cec37a6eSPeter Krystad u64 remote_key; 2246d0060f6SMat Martineau u64 write_seq; 225eaa2ffabSPaolo Abeni u64 snd_nxt; 2266d0060f6SMat Martineau u64 ack_seq; 227fa3fe2b1SFlorian Westphal u64 rcv_wnd_sent; 2283721b9b6SMat Martineau u64 rcv_data_fin_seq; 229e93da928SPaolo Abeni int wmem_reserved; 230d5f49190SPaolo Abeni struct sock *last_snd; 231d5f49190SPaolo Abeni int snd_burst; 232ea4ca586SPaolo Abeni int old_wspace; 233*1e1d9d6fSPaolo Abeni u64 recovery_snd_nxt; /* in recovery mode accept up to this seq; 234*1e1d9d6fSPaolo Abeni * recovery related fields are under data_lock 235*1e1d9d6fSPaolo Abeni * protection 236*1e1d9d6fSPaolo Abeni */ 2377439d687SPaolo Abeni u64 snd_una; 2387439d687SPaolo Abeni u64 wnd_end; 239b51f9b80SPaolo Abeni unsigned long timer_ival; 24079c0949eSPeter Krystad u32 token; 24187952603SPaolo Abeni int rmem_released; 242648ef4b8SMat Martineau unsigned long flags; 243*1e1d9d6fSPaolo Abeni bool recovery; /* closing subflow write queue reinjected */ 244d22f4988SChristoph Paasch bool can_ack; 245b93df08cSPaolo Abeni bool fully_established; 2463721b9b6SMat Martineau bool rcv_data_fin; 2477279da61SMat Martineau bool snd_data_fin_enable; 24850c504a2SFlorian Westphal bool rcv_fastclose; 24937198e93SDavide Caratti bool use_64bit_ack; /* Set when we received a 64-bit DSN */ 250752e9067SGeliang Tang bool csum_enabled; 251ec3edaa7SPeter Krystad spinlock_t join_list_lock; 25280992017SPaolo Abeni struct work_struct work; 253ab174ad8SPaolo Abeni struct sk_buff *ooo_last_skb; 254ab174ad8SPaolo Abeni struct rb_root out_of_order_queue; 25587952603SPaolo Abeni struct sk_buff_head receive_queue; 256724cfd2eSPaolo Abeni int tx_pending_data; 257cec37a6eSPeter Krystad struct list_head conn_list; 25818b683bfSPaolo Abeni struct list_head rtx_queue; 259f0e6a4cfSPaolo Abeni struct mptcp_data_frag *first_pending; 260ec3edaa7SPeter Krystad struct list_head join_list; 261f870fa0bSMat Martineau struct socket *subflow; /* outgoing connect/listener/!mp_capable */ 2628ab183deSPaolo Abeni struct sock *first; 2631b1c7a0eSPeter Krystad struct mptcp_pm_data pm; 264a6b118feSFlorian Westphal struct { 265a6b118feSFlorian Westphal u32 space; /* bytes copied in last measurement window */ 266a6b118feSFlorian Westphal u32 copied; /* bytes copied in this measurement window */ 267a6b118feSFlorian Westphal u64 time; /* start time of measurement window */ 268a6b118feSFlorian Westphal u64 rtt_us; /* last maximum rtt of subflows */ 269a6b118feSFlorian Westphal } rcvq_space; 270df00b087SFlorian Westphal 271df00b087SFlorian Westphal u32 setsockopt_seq; 27220b5759fSPaolo Abeni char ca_name[TCP_CA_NAME_MAX]; 273f870fa0bSMat Martineau }; 274f870fa0bSMat Martineau 275ad80b0fcSPaolo Abeni #define mptcp_lock_sock(___sk, cb) do { \ 276ad80b0fcSPaolo Abeni struct sock *__sk = (___sk); /* silence macro reuse warning */ \ 277ad80b0fcSPaolo Abeni might_sleep(); \ 278ad80b0fcSPaolo Abeni spin_lock_bh(&__sk->sk_lock.slock); \ 279ad80b0fcSPaolo Abeni if (__sk->sk_lock.owned) \ 280ad80b0fcSPaolo Abeni __lock_sock(__sk); \ 281ad80b0fcSPaolo Abeni cb; \ 282ad80b0fcSPaolo Abeni __sk->sk_lock.owned = 1; \ 283ad80b0fcSPaolo Abeni spin_unlock(&__sk->sk_lock.slock); \ 284ad80b0fcSPaolo Abeni mutex_acquire(&__sk->sk_lock.dep_map, 0, 0, _RET_IP_); \ 285ad80b0fcSPaolo Abeni local_bh_enable(); \ 286ad80b0fcSPaolo Abeni } while (0) 287ad80b0fcSPaolo Abeni 28887952603SPaolo Abeni #define mptcp_data_lock(sk) spin_lock_bh(&(sk)->sk_lock.slock) 28987952603SPaolo Abeni #define mptcp_data_unlock(sk) spin_unlock_bh(&(sk)->sk_lock.slock) 29087952603SPaolo Abeni 291cec37a6eSPeter Krystad #define mptcp_for_each_subflow(__msk, __subflow) \ 292cec37a6eSPeter Krystad list_for_each_entry(__subflow, &((__msk)->conn_list), node) 293cec37a6eSPeter Krystad 2943abc05d9SFlorian Westphal static inline void msk_owned_by_me(const struct mptcp_sock *msk) 2953abc05d9SFlorian Westphal { 2963abc05d9SFlorian Westphal sock_owned_by_me((const struct sock *)msk); 2973abc05d9SFlorian Westphal } 2983abc05d9SFlorian Westphal 299f870fa0bSMat Martineau static inline struct mptcp_sock *mptcp_sk(const struct sock *sk) 300f870fa0bSMat Martineau { 301f870fa0bSMat Martineau return (struct mptcp_sock *)sk; 302f870fa0bSMat Martineau } 303f870fa0bSMat Martineau 304ce599c51SPaolo Abeni /* the msk socket don't use the backlog, also account for the bulk 305ce599c51SPaolo Abeni * free memory 306ce599c51SPaolo Abeni */ 307ce599c51SPaolo Abeni static inline int __mptcp_rmem(const struct sock *sk) 308ce599c51SPaolo Abeni { 309ce599c51SPaolo Abeni return atomic_read(&sk->sk_rmem_alloc) - READ_ONCE(mptcp_sk(sk)->rmem_released); 310ce599c51SPaolo Abeni } 311ce599c51SPaolo Abeni 312ea4ca586SPaolo Abeni static inline int __mptcp_space(const struct sock *sk) 313ea4ca586SPaolo Abeni { 314ce599c51SPaolo Abeni return tcp_win_from_space(sk, READ_ONCE(sk->sk_rcvbuf) - __mptcp_rmem(sk)); 315ea4ca586SPaolo Abeni } 316ea4ca586SPaolo Abeni 317f0e6a4cfSPaolo Abeni static inline struct mptcp_data_frag *mptcp_send_head(const struct sock *sk) 318f0e6a4cfSPaolo Abeni { 319f0e6a4cfSPaolo Abeni const struct mptcp_sock *msk = mptcp_sk(sk); 320f0e6a4cfSPaolo Abeni 321f0e6a4cfSPaolo Abeni return READ_ONCE(msk->first_pending); 322f0e6a4cfSPaolo Abeni } 323f0e6a4cfSPaolo Abeni 324f0e6a4cfSPaolo Abeni static inline struct mptcp_data_frag *mptcp_send_next(struct sock *sk) 325f0e6a4cfSPaolo Abeni { 326f0e6a4cfSPaolo Abeni struct mptcp_sock *msk = mptcp_sk(sk); 327f0e6a4cfSPaolo Abeni struct mptcp_data_frag *cur; 328f0e6a4cfSPaolo Abeni 329f0e6a4cfSPaolo Abeni cur = msk->first_pending; 330f0e6a4cfSPaolo Abeni return list_is_last(&cur->list, &msk->rtx_queue) ? NULL : 331f0e6a4cfSPaolo Abeni list_next_entry(cur, list); 332f0e6a4cfSPaolo Abeni } 333f0e6a4cfSPaolo Abeni 334f0e6a4cfSPaolo Abeni static inline struct mptcp_data_frag *mptcp_pending_tail(const struct sock *sk) 335f0e6a4cfSPaolo Abeni { 336f0e6a4cfSPaolo Abeni struct mptcp_sock *msk = mptcp_sk(sk); 337f0e6a4cfSPaolo Abeni 338f0e6a4cfSPaolo Abeni if (!msk->first_pending) 339f0e6a4cfSPaolo Abeni return NULL; 340f0e6a4cfSPaolo Abeni 341f0e6a4cfSPaolo Abeni if (WARN_ON_ONCE(list_empty(&msk->rtx_queue))) 342f0e6a4cfSPaolo Abeni return NULL; 343f0e6a4cfSPaolo Abeni 344f0e6a4cfSPaolo Abeni return list_last_entry(&msk->rtx_queue, struct mptcp_data_frag, list); 345f0e6a4cfSPaolo Abeni } 346f0e6a4cfSPaolo Abeni 3477948f6ccSFlorian Westphal static inline struct mptcp_data_frag *mptcp_rtx_head(const struct sock *sk) 3487948f6ccSFlorian Westphal { 3497948f6ccSFlorian Westphal struct mptcp_sock *msk = mptcp_sk(sk); 3507948f6ccSFlorian Westphal 35164b9cea7SPaolo Abeni if (msk->snd_una == READ_ONCE(msk->snd_nxt)) 35264b9cea7SPaolo Abeni return NULL; 35364b9cea7SPaolo Abeni 354a386bc5bSGeliang Tang return list_first_entry_or_null(&msk->rtx_queue, struct mptcp_data_frag, list); 3557948f6ccSFlorian Westphal } 3567948f6ccSFlorian Westphal 357d0cc2987SGeliang Tang struct csum_pseudo_header { 358d0cc2987SGeliang Tang __be64 data_seq; 359d0cc2987SGeliang Tang __be32 subflow_seq; 360d0cc2987SGeliang Tang __be16 data_len; 361d0cc2987SGeliang Tang __sum16 csum; 362d0cc2987SGeliang Tang }; 363d0cc2987SGeliang Tang 364cec37a6eSPeter Krystad struct mptcp_subflow_request_sock { 365cec37a6eSPeter Krystad struct tcp_request_sock sk; 366d22f4988SChristoph Paasch u16 mp_capable : 1, 367cec37a6eSPeter Krystad mp_join : 1, 36806fe1719SGeliang Tang backup : 1, 369bab6b88eSGeliang Tang csum_reqd : 1, 370bab6b88eSGeliang Tang allow_join_id0 : 1; 3711b1c7a0eSPeter Krystad u8 local_id; 372f296234cSPeter Krystad u8 remote_id; 373cec37a6eSPeter Krystad u64 local_key; 37479c0949eSPeter Krystad u64 idsn; 37579c0949eSPeter Krystad u32 token; 376648ef4b8SMat Martineau u32 ssn_offset; 377f296234cSPeter Krystad u64 thmac; 378f296234cSPeter Krystad u32 local_nonce; 379f296234cSPeter Krystad u32 remote_nonce; 3808fd4de12SPaolo Abeni struct mptcp_sock *msk; 3812c5ebd00SPaolo Abeni struct hlist_nulls_node token_node; 382cec37a6eSPeter Krystad }; 383cec37a6eSPeter Krystad 384cec37a6eSPeter Krystad static inline struct mptcp_subflow_request_sock * 385cec37a6eSPeter Krystad mptcp_subflow_rsk(const struct request_sock *rsk) 386cec37a6eSPeter Krystad { 387cec37a6eSPeter Krystad return (struct mptcp_subflow_request_sock *)rsk; 388cec37a6eSPeter Krystad } 389cec37a6eSPeter Krystad 3906719331cSPaolo Abeni enum mptcp_data_avail { 3916719331cSPaolo Abeni MPTCP_SUBFLOW_NODATA, 3926719331cSPaolo Abeni MPTCP_SUBFLOW_DATA_AVAIL, 3936719331cSPaolo Abeni }; 3946719331cSPaolo Abeni 395b19bc294SPaolo Abeni struct mptcp_delegated_action { 396b19bc294SPaolo Abeni struct napi_struct napi; 397b19bc294SPaolo Abeni struct list_head head; 398b19bc294SPaolo Abeni }; 399b19bc294SPaolo Abeni 400b19bc294SPaolo Abeni DECLARE_PER_CPU(struct mptcp_delegated_action, mptcp_delegated_actions); 401b19bc294SPaolo Abeni 402b19bc294SPaolo Abeni #define MPTCP_DELEGATE_SEND 0 403b19bc294SPaolo Abeni 4042303f994SPeter Krystad /* MPTCP subflow context */ 4052303f994SPeter Krystad struct mptcp_subflow_context { 406cec37a6eSPeter Krystad struct list_head node;/* conn_list of subflows */ 407cec37a6eSPeter Krystad u64 local_key; 408cec37a6eSPeter Krystad u64 remote_key; 40979c0949eSPeter Krystad u64 idsn; 410648ef4b8SMat Martineau u64 map_seq; 411cc7972eaSChristoph Paasch u32 snd_isn; 41279c0949eSPeter Krystad u32 token; 4136d0060f6SMat Martineau u32 rel_write_seq; 414648ef4b8SMat Martineau u32 map_subflow_seq; 415648ef4b8SMat Martineau u32 ssn_offset; 416648ef4b8SMat Martineau u32 map_data_len; 417dd8bcd17SPaolo Abeni __wsum map_data_csum; 418dd8bcd17SPaolo Abeni u32 map_csum_len; 419cec37a6eSPeter Krystad u32 request_mptcp : 1, /* send MP_CAPABLE */ 420ec3edaa7SPeter Krystad request_join : 1, /* send MP_JOIN */ 421ec3edaa7SPeter Krystad request_bkup : 1, 422cec37a6eSPeter Krystad mp_capable : 1, /* remote is MPTCP capable */ 423f296234cSPeter Krystad mp_join : 1, /* remote is JOINing */ 4240be534f5SPaolo Abeni fully_established : 1, /* path validated */ 425f296234cSPeter Krystad pm_notified : 1, /* PM hook called for established status */ 426648ef4b8SMat Martineau conn_finished : 1, 427648ef4b8SMat Martineau map_valid : 1, 428dd8bcd17SPaolo Abeni map_csum_reqd : 1, 429dd8bcd17SPaolo Abeni map_data_fin : 1, 430d22f4988SChristoph Paasch mpc_map : 1, 431f296234cSPeter Krystad backup : 1, 43206706542SGeliang Tang send_mp_prio : 1, 433d22f4988SChristoph Paasch rx_eof : 1, 434e16163b6SPaolo Abeni can_ack : 1, /* only after processing the remote a key */ 435e16163b6SPaolo Abeni disposable : 1; /* ctx can be free at ulp release time */ 4366719331cSPaolo Abeni enum mptcp_data_avail data_avail; 437f296234cSPeter Krystad u32 remote_nonce; 438f296234cSPeter Krystad u64 thmac; 439f296234cSPeter Krystad u32 local_nonce; 440ec3edaa7SPeter Krystad u32 remote_token; 441ec3edaa7SPeter Krystad u8 hmac[MPTCPOPT_HMAC_LEN]; 442f296234cSPeter Krystad u8 local_id; 443f296234cSPeter Krystad u8 remote_id; 444dc87efdbSFlorian Westphal u8 reset_seen:1; 445dc87efdbSFlorian Westphal u8 reset_transient:1; 446dc87efdbSFlorian Westphal u8 reset_reason:4; 44771b7dec2SPaolo Abeni u8 stale_count; 448648ef4b8SMat Martineau 449b19bc294SPaolo Abeni long delegated_status; 450b19bc294SPaolo Abeni struct list_head delegated_node; /* link into delegated_action, protected by local BH */ 451b19bc294SPaolo Abeni 452df00b087SFlorian Westphal u32 setsockopt_seq; 45371b7dec2SPaolo Abeni u32 stale_rcv_tstamp; 454df00b087SFlorian Westphal 4552303f994SPeter Krystad struct sock *tcp_sock; /* tcp sk backpointer */ 4562303f994SPeter Krystad struct sock *conn; /* parent mptcp_sock */ 457cec37a6eSPeter Krystad const struct inet_connection_sock_af_ops *icsk_af_ops; 458648ef4b8SMat Martineau void (*tcp_data_ready)(struct sock *sk); 459648ef4b8SMat Martineau void (*tcp_state_change)(struct sock *sk); 460648ef4b8SMat Martineau void (*tcp_write_space)(struct sock *sk); 46115cc1045SPaolo Abeni void (*tcp_error_report)(struct sock *sk); 462648ef4b8SMat Martineau 4632303f994SPeter Krystad struct rcu_head rcu; 4642303f994SPeter Krystad }; 4652303f994SPeter Krystad 4662303f994SPeter Krystad static inline struct mptcp_subflow_context * 4672303f994SPeter Krystad mptcp_subflow_ctx(const struct sock *sk) 4682303f994SPeter Krystad { 4692303f994SPeter Krystad struct inet_connection_sock *icsk = inet_csk(sk); 4702303f994SPeter Krystad 4712303f994SPeter Krystad /* Use RCU on icsk_ulp_data only for sock diag code */ 4722303f994SPeter Krystad return (__force struct mptcp_subflow_context *)icsk->icsk_ulp_data; 4732303f994SPeter Krystad } 4742303f994SPeter Krystad 4752303f994SPeter Krystad static inline struct sock * 4762303f994SPeter Krystad mptcp_subflow_tcp_sock(const struct mptcp_subflow_context *subflow) 4772303f994SPeter Krystad { 4782303f994SPeter Krystad return subflow->tcp_sock; 4792303f994SPeter Krystad } 4802303f994SPeter Krystad 481648ef4b8SMat Martineau static inline u64 482648ef4b8SMat Martineau mptcp_subflow_get_map_offset(const struct mptcp_subflow_context *subflow) 483648ef4b8SMat Martineau { 484648ef4b8SMat Martineau return tcp_sk(mptcp_subflow_tcp_sock(subflow))->copied_seq - 485648ef4b8SMat Martineau subflow->ssn_offset - 486648ef4b8SMat Martineau subflow->map_subflow_seq; 487648ef4b8SMat Martineau } 488648ef4b8SMat Martineau 489648ef4b8SMat Martineau static inline u64 490648ef4b8SMat Martineau mptcp_subflow_get_mapped_dsn(const struct mptcp_subflow_context *subflow) 491648ef4b8SMat Martineau { 492648ef4b8SMat Martineau return subflow->map_seq + mptcp_subflow_get_map_offset(subflow); 493648ef4b8SMat Martineau } 494648ef4b8SMat Martineau 4950397c6d8SPaolo Abeni static inline void mptcp_add_pending_subflow(struct mptcp_sock *msk, 4960397c6d8SPaolo Abeni struct mptcp_subflow_context *subflow) 4970397c6d8SPaolo Abeni { 4980397c6d8SPaolo Abeni sock_hold(mptcp_subflow_tcp_sock(subflow)); 4990397c6d8SPaolo Abeni spin_lock_bh(&msk->join_list_lock); 5000397c6d8SPaolo Abeni list_add_tail(&subflow->node, &msk->join_list); 5010397c6d8SPaolo Abeni spin_unlock_bh(&msk->join_list_lock); 5020397c6d8SPaolo Abeni } 5030397c6d8SPaolo Abeni 504b19bc294SPaolo Abeni void mptcp_subflow_process_delegated(struct sock *ssk); 505b19bc294SPaolo Abeni 506b19bc294SPaolo Abeni static inline void mptcp_subflow_delegate(struct mptcp_subflow_context *subflow) 507b19bc294SPaolo Abeni { 508b19bc294SPaolo Abeni struct mptcp_delegated_action *delegated; 509b19bc294SPaolo Abeni bool schedule; 510b19bc294SPaolo Abeni 511b19bc294SPaolo Abeni /* The implied barrier pairs with mptcp_subflow_delegated_done(), and 512b19bc294SPaolo Abeni * ensures the below list check sees list updates done prior to status 513b19bc294SPaolo Abeni * bit changes 514b19bc294SPaolo Abeni */ 515b19bc294SPaolo Abeni if (!test_and_set_bit(MPTCP_DELEGATE_SEND, &subflow->delegated_status)) { 516b19bc294SPaolo Abeni /* still on delegated list from previous scheduling */ 517b19bc294SPaolo Abeni if (!list_empty(&subflow->delegated_node)) 518b19bc294SPaolo Abeni return; 519b19bc294SPaolo Abeni 520b19bc294SPaolo Abeni /* the caller held the subflow bh socket lock */ 521b19bc294SPaolo Abeni lockdep_assert_in_softirq(); 522b19bc294SPaolo Abeni 523b19bc294SPaolo Abeni delegated = this_cpu_ptr(&mptcp_delegated_actions); 524b19bc294SPaolo Abeni schedule = list_empty(&delegated->head); 525b19bc294SPaolo Abeni list_add_tail(&subflow->delegated_node, &delegated->head); 526b19bc294SPaolo Abeni sock_hold(mptcp_subflow_tcp_sock(subflow)); 527b19bc294SPaolo Abeni if (schedule) 528b19bc294SPaolo Abeni napi_schedule(&delegated->napi); 529b19bc294SPaolo Abeni } 530b19bc294SPaolo Abeni } 531b19bc294SPaolo Abeni 532b19bc294SPaolo Abeni static inline struct mptcp_subflow_context * 533b19bc294SPaolo Abeni mptcp_subflow_delegated_next(struct mptcp_delegated_action *delegated) 534b19bc294SPaolo Abeni { 535b19bc294SPaolo Abeni struct mptcp_subflow_context *ret; 536b19bc294SPaolo Abeni 537b19bc294SPaolo Abeni if (list_empty(&delegated->head)) 538b19bc294SPaolo Abeni return NULL; 539b19bc294SPaolo Abeni 540b19bc294SPaolo Abeni ret = list_first_entry(&delegated->head, struct mptcp_subflow_context, delegated_node); 541b19bc294SPaolo Abeni list_del_init(&ret->delegated_node); 542b19bc294SPaolo Abeni return ret; 543b19bc294SPaolo Abeni } 544b19bc294SPaolo Abeni 545b19bc294SPaolo Abeni static inline bool mptcp_subflow_has_delegated_action(const struct mptcp_subflow_context *subflow) 546b19bc294SPaolo Abeni { 547b19bc294SPaolo Abeni return test_bit(MPTCP_DELEGATE_SEND, &subflow->delegated_status); 548b19bc294SPaolo Abeni } 549b19bc294SPaolo Abeni 550b19bc294SPaolo Abeni static inline void mptcp_subflow_delegated_done(struct mptcp_subflow_context *subflow) 551b19bc294SPaolo Abeni { 552b19bc294SPaolo Abeni /* pairs with mptcp_subflow_delegate, ensures delegate_node is updated before 553b19bc294SPaolo Abeni * touching the status bit 554b19bc294SPaolo Abeni */ 555b19bc294SPaolo Abeni smp_wmb(); 556b19bc294SPaolo Abeni clear_bit(MPTCP_DELEGATE_SEND, &subflow->delegated_status); 557b19bc294SPaolo Abeni } 558b19bc294SPaolo Abeni 559648ef4b8SMat Martineau int mptcp_is_enabled(struct net *net); 56093f323b9SGeliang Tang unsigned int mptcp_get_add_addr_timeout(struct net *net); 561fc3c82eeSGeliang Tang int mptcp_is_checksum_enabled(struct net *net); 562d2f77960SGeliang Tang int mptcp_allow_join_id0(struct net *net); 563b93df08cSPaolo Abeni void mptcp_subflow_fully_established(struct mptcp_subflow_context *subflow, 564b93df08cSPaolo Abeni struct mptcp_options_received *mp_opt); 565*1e1d9d6fSPaolo Abeni bool __mptcp_retransmit_pending_data(struct sock *sk); 566648ef4b8SMat Martineau bool mptcp_subflow_data_available(struct sock *sk); 567d39dcecaSPaolo Abeni void __init mptcp_subflow_init(void); 568d0876b22SGeliang Tang void mptcp_subflow_shutdown(struct sock *sk, struct sock *ssk, int how); 569a141e02eSFlorian Westphal void mptcp_close_ssk(struct sock *sk, struct sock *ssk, 570e16163b6SPaolo Abeni struct mptcp_subflow_context *subflow); 571d5824847SPaolo Abeni void mptcp_subflow_reset(struct sock *ssk); 572866f26f2SPaolo Abeni void mptcp_sock_graft(struct sock *sk, struct socket *parent); 5731729cf18SGeliang Tang struct socket *__mptcp_nmpc_socket(const struct mptcp_sock *msk); 574ec3edaa7SPeter Krystad 575ec3edaa7SPeter Krystad /* called with sk socket lock held */ 576ef0da3b8SPaolo Abeni int __mptcp_subflow_connect(struct sock *sk, const struct mptcp_addr_info *loc, 577daa83ab0SGeliang Tang const struct mptcp_addr_info *remote, 578daa83ab0SGeliang Tang u8 flags, int ifindex); 5792303f994SPeter Krystad int mptcp_subflow_create_socket(struct sock *sk, struct socket **new_sock); 5801729cf18SGeliang Tang void mptcp_info2sockaddr(const struct mptcp_addr_info *info, 5811729cf18SGeliang Tang struct sockaddr_storage *addr, 5821729cf18SGeliang Tang unsigned short family); 5832303f994SPeter Krystad 58443f1140bSGeliang Tang static inline bool mptcp_subflow_active(struct mptcp_subflow_context *subflow) 58543f1140bSGeliang Tang { 58643f1140bSGeliang Tang struct sock *ssk = mptcp_subflow_tcp_sock(subflow); 58743f1140bSGeliang Tang 58843f1140bSGeliang Tang /* can't send if JOIN hasn't completed yet (i.e. is usable for mptcp) */ 58943f1140bSGeliang Tang if (subflow->request_join && !subflow->fully_established) 59043f1140bSGeliang Tang return false; 59143f1140bSGeliang Tang 59243f1140bSGeliang Tang /* only send if our side has not closed yet */ 59343f1140bSGeliang Tang return ((1 << ssk->sk_state) & (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT)); 59443f1140bSGeliang Tang } 59543f1140bSGeliang Tang 596648ef4b8SMat Martineau static inline void mptcp_subflow_tcp_fallback(struct sock *sk, 597648ef4b8SMat Martineau struct mptcp_subflow_context *ctx) 598648ef4b8SMat Martineau { 599648ef4b8SMat Martineau sk->sk_data_ready = ctx->tcp_data_ready; 600648ef4b8SMat Martineau sk->sk_state_change = ctx->tcp_state_change; 601648ef4b8SMat Martineau sk->sk_write_space = ctx->tcp_write_space; 60215cc1045SPaolo Abeni sk->sk_error_report = ctx->tcp_error_report; 603648ef4b8SMat Martineau 604648ef4b8SMat Martineau inet_csk(sk)->icsk_af_ops = ctx->icsk_af_ops; 605648ef4b8SMat Martineau } 606648ef4b8SMat Martineau 607d39dcecaSPaolo Abeni void __init mptcp_proto_init(void); 608784325e9SMatthieu Baerts #if IS_ENABLED(CONFIG_MPTCP_IPV6) 609d39dcecaSPaolo Abeni int __init mptcp_proto_v6_init(void); 610784325e9SMatthieu Baerts #endif 611648ef4b8SMat Martineau 612fca5c82cSPaolo Abeni struct sock *mptcp_sk_clone(const struct sock *sk, 613cfde141eSPaolo Abeni const struct mptcp_options_received *mp_opt, 614fca5c82cSPaolo Abeni struct request_sock *req); 615c863225bSGeliang Tang void mptcp_get_options(const struct sock *sk, 616c863225bSGeliang Tang const struct sk_buff *skb, 617cfde141eSPaolo Abeni struct mptcp_options_received *mp_opt); 618cec37a6eSPeter Krystad 619cec37a6eSPeter Krystad void mptcp_finish_connect(struct sock *sk); 620490274b4SPaolo Abeni void __mptcp_set_connected(struct sock *sk); 621b93df08cSPaolo Abeni static inline bool mptcp_is_fully_established(struct sock *sk) 622b93df08cSPaolo Abeni { 623b93df08cSPaolo Abeni return inet_sk_state_load(sk) == TCP_ESTABLISHED && 624b93df08cSPaolo Abeni READ_ONCE(mptcp_sk(sk)->fully_established); 625b93df08cSPaolo Abeni } 626a6b118feSFlorian Westphal void mptcp_rcv_space_init(struct mptcp_sock *msk, const struct sock *ssk); 6272e52213cSFlorian Westphal void mptcp_data_ready(struct sock *sk, struct sock *ssk); 628f296234cSPeter Krystad bool mptcp_finish_join(struct sock *sk); 629ba8f48f7SPaolo Abeni bool mptcp_schedule_work(struct sock *sk); 6300abdde82SPaolo Abeni int mptcp_setsockopt(struct sock *sk, int level, int optname, 6310abdde82SPaolo Abeni sockptr_t optval, unsigned int optlen); 6320abdde82SPaolo Abeni int mptcp_getsockopt(struct sock *sk, int level, int optname, 6330abdde82SPaolo Abeni char __user *optval, int __user *option); 6340abdde82SPaolo Abeni 6351502328fSPaolo Abeni u64 __mptcp_expand_seq(u64 old_seq, u64 cur_seq); 6361502328fSPaolo Abeni static inline u64 mptcp_expand_seq(u64 old_seq, u64 cur_seq, bool use_64bit) 6371502328fSPaolo Abeni { 6381502328fSPaolo Abeni if (use_64bit) 6391502328fSPaolo Abeni return cur_seq; 6401502328fSPaolo Abeni 6411502328fSPaolo Abeni return __mptcp_expand_seq(old_seq, cur_seq); 6421502328fSPaolo Abeni } 643219d0499SPaolo Abeni void __mptcp_check_push(struct sock *sk, struct sock *ssk); 6447439d687SPaolo Abeni void __mptcp_data_acked(struct sock *sk); 64515cc1045SPaolo Abeni void __mptcp_error_report(struct sock *sk); 64659832e24SFlorian Westphal void mptcp_subflow_eof(struct sock *sk); 6471a49b2c2SMat Martineau bool mptcp_update_rcv_data_fin(struct mptcp_sock *msk, u64 data_fin_seq, bool use_64bit); 64884dfe367SGeliang Tang void __mptcp_flush_join_list(struct mptcp_sock *msk); 649e16163b6SPaolo Abeni static inline bool mptcp_data_fin_enabled(const struct mptcp_sock *msk) 650e16163b6SPaolo Abeni { 651e16163b6SPaolo Abeni return READ_ONCE(msk->snd_data_fin_enable) && 652e16163b6SPaolo Abeni READ_ONCE(msk->write_seq) == READ_ONCE(msk->snd_nxt); 653e16163b6SPaolo Abeni } 654e16163b6SPaolo Abeni 6555cf92bbaSPaolo Abeni static inline bool mptcp_propagate_sndbuf(struct sock *sk, struct sock *ssk) 6565cf92bbaSPaolo Abeni { 6575cf92bbaSPaolo Abeni if ((sk->sk_userlocks & SOCK_SNDBUF_LOCK) || ssk->sk_sndbuf <= READ_ONCE(sk->sk_sndbuf)) 6585cf92bbaSPaolo Abeni return false; 6595cf92bbaSPaolo Abeni 6605cf92bbaSPaolo Abeni WRITE_ONCE(sk->sk_sndbuf, ssk->sk_sndbuf); 6615cf92bbaSPaolo Abeni return true; 6625cf92bbaSPaolo Abeni } 6635cf92bbaSPaolo Abeni 6645cf92bbaSPaolo Abeni static inline void mptcp_write_space(struct sock *sk) 6655cf92bbaSPaolo Abeni { 6665cf92bbaSPaolo Abeni if (sk_stream_is_writeable(sk)) { 6675cf92bbaSPaolo Abeni /* pairs with memory barrier in mptcp_poll */ 6685cf92bbaSPaolo Abeni smp_mb(); 6695cf92bbaSPaolo Abeni if (test_and_clear_bit(MPTCP_NOSPACE, &mptcp_sk(sk)->flags)) 6705cf92bbaSPaolo Abeni sk_stream_write_space(sk); 6715cf92bbaSPaolo Abeni } 6725cf92bbaSPaolo Abeni } 6735cf92bbaSPaolo Abeni 6745c8c1640SGeliang Tang void mptcp_destroy_common(struct mptcp_sock *msk); 675cec37a6eSPeter Krystad 676c68a0cd1SJianguo Wu #define MPTCP_TOKEN_MAX_RETRIES 4 677c68a0cd1SJianguo Wu 6782c5ebd00SPaolo Abeni void __init mptcp_token_init(void); 6792c5ebd00SPaolo Abeni static inline void mptcp_token_init_request(struct request_sock *req) 6802c5ebd00SPaolo Abeni { 6812c5ebd00SPaolo Abeni mptcp_subflow_rsk(req)->token_node.pprev = NULL; 6822c5ebd00SPaolo Abeni } 6832c5ebd00SPaolo Abeni 68479c0949eSPeter Krystad int mptcp_token_new_request(struct request_sock *req); 6852c5ebd00SPaolo Abeni void mptcp_token_destroy_request(struct request_sock *req); 68679c0949eSPeter Krystad int mptcp_token_new_connect(struct sock *sk); 6872c5ebd00SPaolo Abeni void mptcp_token_accept(struct mptcp_subflow_request_sock *r, 6882c5ebd00SPaolo Abeni struct mptcp_sock *msk); 689c83a47e5SFlorian Westphal bool mptcp_token_exists(u32 token); 690f296234cSPeter Krystad struct mptcp_sock *mptcp_token_get_sock(u32 token); 69196d890daSPaolo Abeni struct mptcp_sock *mptcp_token_iter_next(const struct net *net, long *s_slot, 69296d890daSPaolo Abeni long *s_num); 6932c5ebd00SPaolo Abeni void mptcp_token_destroy(struct mptcp_sock *msk); 69479c0949eSPeter Krystad 69579c0949eSPeter Krystad void mptcp_crypto_key_sha(u64 key, u32 *token, u64 *idsn); 69679c0949eSPeter Krystad 6973df523abSPeter Krystad void mptcp_crypto_hmac_sha(u64 key1, u64 key2, u8 *msg, int len, void *hmac); 69879c0949eSPeter Krystad 699d39dcecaSPaolo Abeni void __init mptcp_pm_init(void); 7001b1c7a0eSPeter Krystad void mptcp_pm_data_init(struct mptcp_sock *msk); 70171b7dec2SPaolo Abeni void mptcp_pm_subflow_chk_stale(const struct mptcp_sock *msk, struct sock *ssk); 7026c714f1bSFlorian Westphal void mptcp_pm_new_connection(struct mptcp_sock *msk, const struct sock *ssk, int server_side); 7036c714f1bSFlorian Westphal void mptcp_pm_fully_established(struct mptcp_sock *msk, const struct sock *ssk, gfp_t gfp); 7041b1c7a0eSPeter Krystad bool mptcp_pm_allow_new_subflow(struct mptcp_sock *msk); 7051b1c7a0eSPeter Krystad void mptcp_pm_connection_closed(struct mptcp_sock *msk); 70662535200SGeliang Tang void mptcp_pm_subflow_established(struct mptcp_sock *msk); 7071b1c7a0eSPeter Krystad void mptcp_pm_subflow_closed(struct mptcp_sock *msk, u8 id); 7081b1c7a0eSPeter Krystad void mptcp_pm_add_addr_received(struct mptcp_sock *msk, 7091b1c7a0eSPeter Krystad const struct mptcp_addr_info *addr); 710557963c3SGeliang Tang void mptcp_pm_add_addr_echoed(struct mptcp_sock *msk, 711557963c3SGeliang Tang struct mptcp_addr_info *addr); 71284dfe367SGeliang Tang void mptcp_pm_add_addr_send_ack(struct mptcp_sock *msk); 713b46a0238SGeliang Tang void mptcp_pm_nl_addr_send_ack(struct mptcp_sock *msk); 7145c4a824dSGeliang Tang void mptcp_pm_rm_addr_received(struct mptcp_sock *msk, 7155c4a824dSGeliang Tang const struct mptcp_rm_list *rm_list); 71640453a5cSGeliang Tang void mptcp_pm_mp_prio_received(struct sock *sk, u8 bkup); 71706706542SGeliang Tang int mptcp_pm_nl_mp_prio_send_ack(struct mptcp_sock *msk, 71806706542SGeliang Tang struct mptcp_addr_info *addr, 71906706542SGeliang Tang u8 bkup); 720b6c08380SGeliang Tang void mptcp_pm_free_anno_list(struct mptcp_sock *msk); 7215bc56388SGeliang Tang bool mptcp_pm_sport_in_anno_list(struct mptcp_sock *msk, const struct sock *sk); 72200cfd77bSGeliang Tang struct mptcp_pm_add_entry * 72300cfd77bSGeliang Tang mptcp_pm_del_add_timer(struct mptcp_sock *msk, 724d58300c3SDavide Caratti struct mptcp_addr_info *addr, bool check_id); 725d88c476fSGeliang Tang struct mptcp_pm_add_entry * 726d88c476fSGeliang Tang mptcp_lookup_anno_list_by_saddr(struct mptcp_sock *msk, 727d88c476fSGeliang Tang struct mptcp_addr_info *addr); 7281b1c7a0eSPeter Krystad 7291b1c7a0eSPeter Krystad int mptcp_pm_announce_addr(struct mptcp_sock *msk, 7306a6c05a8SGeliang Tang const struct mptcp_addr_info *addr, 731f7efc777SGeliang Tang bool echo); 732cbde2787SGeliang Tang int mptcp_pm_remove_addr(struct mptcp_sock *msk, const struct mptcp_rm_list *rm_list); 733ddd14bb8SGeliang Tang int mptcp_pm_remove_subflow(struct mptcp_sock *msk, const struct mptcp_rm_list *rm_list); 7341b1c7a0eSPeter Krystad 735b911c97cSFlorian Westphal void mptcp_event(enum mptcp_event_type type, const struct mptcp_sock *msk, 736b911c97cSFlorian Westphal const struct sock *ssk, gfp_t gfp); 737b911c97cSFlorian Westphal void mptcp_event_addr_announced(const struct mptcp_sock *msk, const struct mptcp_addr_info *info); 738b911c97cSFlorian Westphal void mptcp_event_addr_removed(const struct mptcp_sock *msk, u8 id); 739b911c97cSFlorian Westphal 740f643b803SGeliang Tang static inline bool mptcp_pm_should_add_signal(struct mptcp_sock *msk) 7411b1c7a0eSPeter Krystad { 74213ad9f01SGeliang Tang return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_SIGNAL); 743d91d322aSGeliang Tang } 744d91d322aSGeliang Tang 745d91d322aSGeliang Tang static inline bool mptcp_pm_should_add_signal_echo(struct mptcp_sock *msk) 746d91d322aSGeliang Tang { 74713ad9f01SGeliang Tang return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_ECHO); 7481b1c7a0eSPeter Krystad } 7491b1c7a0eSPeter Krystad 75084dfe367SGeliang Tang static inline bool mptcp_pm_should_add_signal_ipv6(struct mptcp_sock *msk) 75184dfe367SGeliang Tang { 75213ad9f01SGeliang Tang return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_IPV6); 75384dfe367SGeliang Tang } 75484dfe367SGeliang Tang 7554a2777a8SGeliang Tang static inline bool mptcp_pm_should_add_signal_port(struct mptcp_sock *msk) 7564a2777a8SGeliang Tang { 75713ad9f01SGeliang Tang return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_PORT); 7584a2777a8SGeliang Tang } 7594a2777a8SGeliang Tang 7605cb104aeSGeliang Tang static inline bool mptcp_pm_should_rm_signal(struct mptcp_sock *msk) 7615cb104aeSGeliang Tang { 76213ad9f01SGeliang Tang return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_RM_ADDR_SIGNAL); 7635cb104aeSGeliang Tang } 7645cb104aeSGeliang Tang 7654a2777a8SGeliang Tang static inline unsigned int mptcp_add_addr_len(int family, bool echo, bool port) 7661b1c7a0eSPeter Krystad { 7672ec72faeSGeliang Tang u8 len = TCPOLEN_MPTCP_ADD_ADDR_BASE; 7682ec72faeSGeliang Tang 7692ec72faeSGeliang Tang if (family == AF_INET6) 7702ec72faeSGeliang Tang len = TCPOLEN_MPTCP_ADD_ADDR6_BASE; 7712ec72faeSGeliang Tang if (!echo) 7722ec72faeSGeliang Tang len += MPTCPOPT_THMAC_LEN; 77327ab92d9SDavide Caratti /* account for 2 trailing 'nop' options */ 7744a2777a8SGeliang Tang if (port) 77527ab92d9SDavide Caratti len += TCPOLEN_MPTCP_PORT_LEN + TCPOLEN_MPTCP_PORT_ALIGN; 7762ec72faeSGeliang Tang 7772ec72faeSGeliang Tang return len; 7781b1c7a0eSPeter Krystad } 7791b1c7a0eSPeter Krystad 7806445e17aSGeliang Tang static inline int mptcp_rm_addr_len(const struct mptcp_rm_list *rm_list) 7816445e17aSGeliang Tang { 7826445e17aSGeliang Tang if (rm_list->nr == 0 || rm_list->nr > MPTCP_RM_IDS_MAX) 7836445e17aSGeliang Tang return -EINVAL; 7846445e17aSGeliang Tang 7856445e17aSGeliang Tang return TCPOLEN_MPTCP_RM_ADDR_BASE + roundup(rm_list->nr - 1, 4) + 1; 7866445e17aSGeliang Tang } 7876445e17aSGeliang Tang 788f643b803SGeliang Tang bool mptcp_pm_add_addr_signal(struct mptcp_sock *msk, unsigned int remaining, 7894a2777a8SGeliang Tang struct mptcp_addr_info *saddr, bool *echo, bool *port); 7905cb104aeSGeliang Tang bool mptcp_pm_rm_addr_signal(struct mptcp_sock *msk, unsigned int remaining, 7916445e17aSGeliang Tang struct mptcp_rm_list *rm_list); 7921b1c7a0eSPeter Krystad int mptcp_pm_get_local_id(struct mptcp_sock *msk, struct sock_common *skc); 7931b1c7a0eSPeter Krystad 794d39dcecaSPaolo Abeni void __init mptcp_pm_nl_init(void); 79501cacb00SPaolo Abeni void mptcp_pm_nl_data_init(struct mptcp_sock *msk); 796e9801430SFlorian Westphal void mptcp_pm_nl_work(struct mptcp_sock *msk); 797ddd14bb8SGeliang Tang void mptcp_pm_nl_rm_subflow_received(struct mptcp_sock *msk, 798ddd14bb8SGeliang Tang const struct mptcp_rm_list *rm_list); 79901cacb00SPaolo Abeni int mptcp_pm_nl_get_local_id(struct mptcp_sock *msk, struct sock_common *skc); 800a914e586SGeliang Tang unsigned int mptcp_pm_get_add_addr_signal_max(struct mptcp_sock *msk); 801a914e586SGeliang Tang unsigned int mptcp_pm_get_add_addr_accept_max(struct mptcp_sock *msk); 802a914e586SGeliang Tang unsigned int mptcp_pm_get_subflows_max(struct mptcp_sock *msk); 8030caf3adaSGeliang Tang unsigned int mptcp_pm_get_local_addr_max(struct mptcp_sock *msk); 80401cacb00SPaolo Abeni 80578962489SFlorian Westphal void mptcp_sockopt_sync(struct mptcp_sock *msk, struct sock *ssk); 80678962489SFlorian Westphal void mptcp_sockopt_sync_all(struct mptcp_sock *msk); 80778962489SFlorian Westphal 808dc87efdbSFlorian Westphal static inline struct mptcp_ext *mptcp_get_ext(const struct sk_buff *skb) 8096d0060f6SMat Martineau { 8106d0060f6SMat Martineau return (struct mptcp_ext *)skb_ext_find(skb, SKB_EXT_MPTCP); 8116d0060f6SMat Martineau } 8126d0060f6SMat Martineau 8135147dfb5SDavide Caratti void mptcp_diag_subflow_init(struct tcp_ulp_ops *ops); 8145147dfb5SDavide Caratti 815d5f49190SPaolo Abeni static inline bool __mptcp_check_fallback(const struct mptcp_sock *msk) 816e1ff9e82SDavide Caratti { 817e1ff9e82SDavide Caratti return test_bit(MPTCP_FALLBACK_DONE, &msk->flags); 818e1ff9e82SDavide Caratti } 819e1ff9e82SDavide Caratti 820d5f49190SPaolo Abeni static inline bool mptcp_check_fallback(const struct sock *sk) 821e1ff9e82SDavide Caratti { 822e1ff9e82SDavide Caratti struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); 823e1ff9e82SDavide Caratti struct mptcp_sock *msk = mptcp_sk(subflow->conn); 824e1ff9e82SDavide Caratti 825e1ff9e82SDavide Caratti return __mptcp_check_fallback(msk); 826e1ff9e82SDavide Caratti } 827e1ff9e82SDavide Caratti 828e1ff9e82SDavide Caratti static inline void __mptcp_do_fallback(struct mptcp_sock *msk) 829e1ff9e82SDavide Caratti { 830e1ff9e82SDavide Caratti if (test_bit(MPTCP_FALLBACK_DONE, &msk->flags)) { 831e1ff9e82SDavide Caratti pr_debug("TCP fallback already done (msk=%p)", msk); 832e1ff9e82SDavide Caratti return; 833e1ff9e82SDavide Caratti } 834e1ff9e82SDavide Caratti set_bit(MPTCP_FALLBACK_DONE, &msk->flags); 835e1ff9e82SDavide Caratti } 836e1ff9e82SDavide Caratti 837e1ff9e82SDavide Caratti static inline void mptcp_do_fallback(struct sock *sk) 838e1ff9e82SDavide Caratti { 839e1ff9e82SDavide Caratti struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); 840e1ff9e82SDavide Caratti struct mptcp_sock *msk = mptcp_sk(subflow->conn); 841e1ff9e82SDavide Caratti 842e1ff9e82SDavide Caratti __mptcp_do_fallback(msk); 843e1ff9e82SDavide Caratti } 844e1ff9e82SDavide Caratti 845e1ff9e82SDavide Caratti #define pr_fallback(a) pr_debug("%s:fallback to TCP (msk=%p)", __func__, a) 846e1ff9e82SDavide Caratti 8478fd73804SDavide Caratti static inline bool subflow_simultaneous_connect(struct sock *sk) 8488fd73804SDavide Caratti { 8498fd73804SDavide Caratti struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); 8508fd73804SDavide Caratti struct sock *parent = subflow->conn; 8518fd73804SDavide Caratti 8528fd73804SDavide Caratti return sk->sk_state == TCP_ESTABLISHED && 8538fd73804SDavide Caratti !mptcp_sk(parent)->pm.server_side && 8548fd73804SDavide Caratti !subflow->conn_finished; 8558fd73804SDavide Caratti } 8568fd73804SDavide Caratti 8579466a1ccSFlorian Westphal #ifdef CONFIG_SYN_COOKIES 8589466a1ccSFlorian Westphal void subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req, 8599466a1ccSFlorian Westphal struct sk_buff *skb); 8609466a1ccSFlorian Westphal bool mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req, 8619466a1ccSFlorian Westphal struct sk_buff *skb); 8629466a1ccSFlorian Westphal void __init mptcp_join_cookie_init(void); 8639466a1ccSFlorian Westphal #else 8649466a1ccSFlorian Westphal static inline void 8659466a1ccSFlorian Westphal subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req, 8669466a1ccSFlorian Westphal struct sk_buff *skb) {} 8679466a1ccSFlorian Westphal static inline bool 8689466a1ccSFlorian Westphal mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req, 8699466a1ccSFlorian Westphal struct sk_buff *skb) 8709466a1ccSFlorian Westphal { 8719466a1ccSFlorian Westphal return false; 8729466a1ccSFlorian Westphal } 8739466a1ccSFlorian Westphal 8749466a1ccSFlorian Westphal static inline void mptcp_join_cookie_init(void) {} 8759466a1ccSFlorian Westphal #endif 8769466a1ccSFlorian Westphal 877f870fa0bSMat Martineau #endif /* __MPTCP_PROTOCOL_H */ 878