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 71ec3edaa7SPeter Krystad /* MPTCP MP_JOIN flags */ 72f296234cSPeter Krystad #define MPTCPOPT_BACKUP BIT(0) 73f296234cSPeter Krystad #define MPTCPOPT_HMAC_LEN 20 74ec3edaa7SPeter Krystad #define MPTCPOPT_THMAC_LEN 8 75f296234cSPeter Krystad 76eda7acddSPeter Krystad /* MPTCP MP_CAPABLE flags */ 77eda7acddSPeter Krystad #define MPTCP_VERSION_MASK (0x0F) 78eda7acddSPeter Krystad #define MPTCP_CAP_CHECKSUM_REQD BIT(7) 79eda7acddSPeter Krystad #define MPTCP_CAP_EXTENSIBILITY BIT(6) 8065492c5aSPaolo Abeni #define MPTCP_CAP_HMAC_SHA256 BIT(0) 81eda7acddSPeter Krystad #define MPTCP_CAP_FLAG_MASK (0x3F) 82eda7acddSPeter Krystad 836d0060f6SMat Martineau /* MPTCP DSS flags */ 846d0060f6SMat Martineau #define MPTCP_DSS_DATA_FIN BIT(4) 856d0060f6SMat Martineau #define MPTCP_DSS_DSN64 BIT(3) 866d0060f6SMat Martineau #define MPTCP_DSS_HAS_MAP BIT(2) 876d0060f6SMat Martineau #define MPTCP_DSS_ACK64 BIT(1) 886d0060f6SMat Martineau #define MPTCP_DSS_HAS_ACK BIT(0) 89648ef4b8SMat Martineau #define MPTCP_DSS_FLAG_MASK (0x1F) 90648ef4b8SMat Martineau 913df523abSPeter Krystad /* MPTCP ADD_ADDR flags */ 923df523abSPeter Krystad #define MPTCP_ADDR_ECHO BIT(0) 933df523abSPeter Krystad 9440453a5cSGeliang Tang /* MPTCP MP_PRIO flags */ 9540453a5cSGeliang Tang #define MPTCP_PRIO_BKUP BIT(0) 9640453a5cSGeliang Tang 97dc87efdbSFlorian Westphal /* MPTCP TCPRST flags */ 98dc87efdbSFlorian Westphal #define MPTCP_RST_TRANSIENT BIT(0) 99dc87efdbSFlorian Westphal 100648ef4b8SMat Martineau /* MPTCP socket flags */ 101d99bfed5SFlorian Westphal #define MPTCP_DATA_READY 0 1028edf0864SFlorian Westphal #define MPTCP_NOSPACE 1 1033b1d6210SPaolo Abeni #define MPTCP_WORK_RTX 2 10459832e24SFlorian Westphal #define MPTCP_WORK_EOF 3 105e1ff9e82SDavide Caratti #define MPTCP_FALLBACK_DONE 4 1060e4f35d7SPaolo Abeni #define MPTCP_WORK_CLOSE_SUBFLOW 5 1076e628cd3SPaolo Abeni #define MPTCP_PUSH_PENDING 6 1086e628cd3SPaolo Abeni #define MPTCP_CLEAN_UNA 7 10915cc1045SPaolo Abeni #define MPTCP_ERROR_REPORT 8 1102d6f5a2bSPaolo Abeni #define MPTCP_RETRANSMIT 9 11178962489SFlorian Westphal #define MPTCP_WORK_SYNC_SETSOCKOPT 10 1126d0060f6SMat Martineau 113eaa2ffabSPaolo Abeni static inline bool before64(__u64 seq1, __u64 seq2) 114eaa2ffabSPaolo Abeni { 115eaa2ffabSPaolo Abeni return (__s64)(seq1 - seq2) < 0; 116eaa2ffabSPaolo Abeni } 117eaa2ffabSPaolo Abeni 118eaa2ffabSPaolo Abeni #define after64(seq2, seq1) before64(seq1, seq2) 119eaa2ffabSPaolo Abeni 120cfde141eSPaolo Abeni struct mptcp_options_received { 121cfde141eSPaolo Abeni u64 sndr_key; 122cfde141eSPaolo Abeni u64 rcvr_key; 123cfde141eSPaolo Abeni u64 data_ack; 124cfde141eSPaolo Abeni u64 data_seq; 125cfde141eSPaolo Abeni u32 subflow_seq; 126cfde141eSPaolo Abeni u16 data_len; 127cfde141eSPaolo Abeni u16 mp_capable : 1, 128cfde141eSPaolo Abeni mp_join : 1, 12950c504a2SFlorian Westphal fastclose : 1, 130dc87efdbSFlorian Westphal reset : 1, 131cfde141eSPaolo Abeni dss : 1, 132cfde141eSPaolo Abeni add_addr : 1, 133cfde141eSPaolo Abeni rm_addr : 1, 13440453a5cSGeliang Tang mp_prio : 1, 135cfde141eSPaolo Abeni echo : 1, 136cfde141eSPaolo Abeni backup : 1; 137cfde141eSPaolo Abeni u32 token; 138cfde141eSPaolo Abeni u32 nonce; 139cfde141eSPaolo Abeni u64 thmac; 140ba34c3deSGeliang Tang u8 hmac[MPTCPOPT_HMAC_LEN]; 141cfde141eSPaolo Abeni u8 join_id; 142cfde141eSPaolo Abeni u8 use_map:1, 143cfde141eSPaolo Abeni dsn64:1, 144cfde141eSPaolo Abeni data_fin:1, 145cfde141eSPaolo Abeni use_ack:1, 146cfde141eSPaolo Abeni ack64:1, 147cfde141eSPaolo Abeni mpc_map:1, 148cfde141eSPaolo Abeni __unused:2; 149f7dafee1SGeliang Tang struct mptcp_addr_info addr; 1505c4a824dSGeliang Tang struct mptcp_rm_list rm_list; 151cfde141eSPaolo Abeni u64 ahmac; 152dc87efdbSFlorian Westphal u8 reset_reason:4; 153dc87efdbSFlorian Westphal u8 reset_transient:1; 154cfde141eSPaolo Abeni }; 155cfde141eSPaolo Abeni 1563df523abSPeter Krystad static inline __be32 mptcp_option(u8 subopt, u8 len, u8 nib, u8 field) 1573df523abSPeter Krystad { 1583df523abSPeter Krystad return htonl((TCPOPT_MPTCP << 24) | (len << 16) | (subopt << 12) | 1593df523abSPeter Krystad ((nib & 0xF) << 8) | field); 1603df523abSPeter Krystad } 1613df523abSPeter Krystad 1621b1c7a0eSPeter Krystad enum mptcp_pm_status { 1631b1c7a0eSPeter Krystad MPTCP_PM_ADD_ADDR_RECEIVED, 16484dfe367SGeliang Tang MPTCP_PM_ADD_ADDR_SEND_ACK, 165d0876b22SGeliang Tang MPTCP_PM_RM_ADDR_RECEIVED, 1661b1c7a0eSPeter Krystad MPTCP_PM_ESTABLISHED, 1675b950ff4SPaolo Abeni MPTCP_PM_ALREADY_ESTABLISHED, /* persistent status, set after ESTABLISHED event */ 1681b1c7a0eSPeter Krystad MPTCP_PM_SUBFLOW_ESTABLISHED, 1691b1c7a0eSPeter Krystad }; 1701b1c7a0eSPeter Krystad 17113ad9f01SGeliang Tang enum mptcp_addr_signal_status { 172d91d322aSGeliang Tang MPTCP_ADD_ADDR_SIGNAL, 173d91d322aSGeliang Tang MPTCP_ADD_ADDR_ECHO, 17484dfe367SGeliang Tang MPTCP_ADD_ADDR_IPV6, 1754a2777a8SGeliang Tang MPTCP_ADD_ADDR_PORT, 17642842a42SGeliang Tang MPTCP_RM_ADDR_SIGNAL, 177d91d322aSGeliang Tang }; 178d91d322aSGeliang Tang 1791b1c7a0eSPeter Krystad struct mptcp_pm_data { 1801b1c7a0eSPeter Krystad struct mptcp_addr_info local; 1811b1c7a0eSPeter Krystad struct mptcp_addr_info remote; 182b6c08380SGeliang Tang struct list_head anno_list; 1831b1c7a0eSPeter Krystad 1841b1c7a0eSPeter Krystad spinlock_t lock; /*protects the whole PM data */ 1851b1c7a0eSPeter Krystad 18613ad9f01SGeliang Tang u8 addr_signal; 1871b1c7a0eSPeter Krystad bool server_side; 1881b1c7a0eSPeter Krystad bool work_pending; 1891b1c7a0eSPeter Krystad bool accept_addr; 1901b1c7a0eSPeter Krystad bool accept_subflow; 1911b1c7a0eSPeter Krystad u8 add_addr_signaled; 1921b1c7a0eSPeter Krystad u8 add_addr_accepted; 1931b1c7a0eSPeter Krystad u8 local_addr_used; 1941b1c7a0eSPeter Krystad u8 subflows; 1951b1c7a0eSPeter Krystad u8 status; 196cbde2787SGeliang Tang struct mptcp_rm_list rm_list_tx; 197b5c55f33SGeliang Tang struct mptcp_rm_list rm_list_rx; 1981b1c7a0eSPeter Krystad }; 1991b1c7a0eSPeter Krystad 20018b683bfSPaolo Abeni struct mptcp_data_frag { 20118b683bfSPaolo Abeni struct list_head list; 20218b683bfSPaolo Abeni u64 data_seq; 203f0e6a4cfSPaolo Abeni u16 data_len; 204f0e6a4cfSPaolo Abeni u16 offset; 205f0e6a4cfSPaolo Abeni u16 overhead; 206f0e6a4cfSPaolo Abeni u16 already_sent; 20718b683bfSPaolo Abeni struct page *page; 20818b683bfSPaolo Abeni }; 20918b683bfSPaolo Abeni 210f870fa0bSMat Martineau /* MPTCP connection sock */ 211f870fa0bSMat Martineau struct mptcp_sock { 212f870fa0bSMat Martineau /* inet_connection_sock must be the first member */ 213f870fa0bSMat Martineau struct inet_connection_sock sk; 214cec37a6eSPeter Krystad u64 local_key; 215cec37a6eSPeter Krystad u64 remote_key; 2166d0060f6SMat Martineau u64 write_seq; 217eaa2ffabSPaolo Abeni u64 snd_nxt; 2186d0060f6SMat Martineau u64 ack_seq; 219fa3fe2b1SFlorian Westphal u64 rcv_wnd_sent; 2203721b9b6SMat Martineau u64 rcv_data_fin_seq; 221e93da928SPaolo Abeni int wmem_reserved; 222d5f49190SPaolo Abeni struct sock *last_snd; 223d5f49190SPaolo Abeni int snd_burst; 224ea4ca586SPaolo Abeni int old_wspace; 2257439d687SPaolo Abeni u64 snd_una; 2267439d687SPaolo Abeni u64 wnd_end; 227b51f9b80SPaolo Abeni unsigned long timer_ival; 22879c0949eSPeter Krystad u32 token; 22987952603SPaolo Abeni int rmem_released; 230648ef4b8SMat Martineau unsigned long flags; 231d22f4988SChristoph Paasch bool can_ack; 232b93df08cSPaolo Abeni bool fully_established; 2333721b9b6SMat Martineau bool rcv_data_fin; 2347279da61SMat Martineau bool snd_data_fin_enable; 23550c504a2SFlorian Westphal bool rcv_fastclose; 23637198e93SDavide Caratti bool use_64bit_ack; /* Set when we received a 64-bit DSN */ 237752e9067SGeliang Tang bool csum_enabled; 238ec3edaa7SPeter Krystad spinlock_t join_list_lock; 239ea4ca586SPaolo Abeni struct sock *ack_hint; 24080992017SPaolo Abeni struct work_struct work; 241ab174ad8SPaolo Abeni struct sk_buff *ooo_last_skb; 242ab174ad8SPaolo Abeni struct rb_root out_of_order_queue; 24387952603SPaolo Abeni struct sk_buff_head receive_queue; 244724cfd2eSPaolo Abeni struct sk_buff_head skb_tx_cache; /* this is wmem accounted */ 245724cfd2eSPaolo Abeni int tx_pending_data; 246724cfd2eSPaolo Abeni int size_goal_cache; 247cec37a6eSPeter Krystad struct list_head conn_list; 24818b683bfSPaolo Abeni struct list_head rtx_queue; 249f0e6a4cfSPaolo Abeni struct mptcp_data_frag *first_pending; 250ec3edaa7SPeter Krystad struct list_head join_list; 251f870fa0bSMat Martineau struct socket *subflow; /* outgoing connect/listener/!mp_capable */ 2528ab183deSPaolo Abeni struct sock *first; 2531b1c7a0eSPeter Krystad struct mptcp_pm_data pm; 254a6b118feSFlorian Westphal struct { 255a6b118feSFlorian Westphal u32 space; /* bytes copied in last measurement window */ 256a6b118feSFlorian Westphal u32 copied; /* bytes copied in this measurement window */ 257a6b118feSFlorian Westphal u64 time; /* start time of measurement window */ 258a6b118feSFlorian Westphal u64 rtt_us; /* last maximum rtt of subflows */ 259a6b118feSFlorian Westphal } rcvq_space; 260df00b087SFlorian Westphal 261df00b087SFlorian Westphal u32 setsockopt_seq; 26220b5759fSPaolo Abeni char ca_name[TCP_CA_NAME_MAX]; 263f870fa0bSMat Martineau }; 264f870fa0bSMat Martineau 265ad80b0fcSPaolo Abeni #define mptcp_lock_sock(___sk, cb) do { \ 266ad80b0fcSPaolo Abeni struct sock *__sk = (___sk); /* silence macro reuse warning */ \ 267ad80b0fcSPaolo Abeni might_sleep(); \ 268ad80b0fcSPaolo Abeni spin_lock_bh(&__sk->sk_lock.slock); \ 269ad80b0fcSPaolo Abeni if (__sk->sk_lock.owned) \ 270ad80b0fcSPaolo Abeni __lock_sock(__sk); \ 271ad80b0fcSPaolo Abeni cb; \ 272ad80b0fcSPaolo Abeni __sk->sk_lock.owned = 1; \ 273ad80b0fcSPaolo Abeni spin_unlock(&__sk->sk_lock.slock); \ 274ad80b0fcSPaolo Abeni mutex_acquire(&__sk->sk_lock.dep_map, 0, 0, _RET_IP_); \ 275ad80b0fcSPaolo Abeni local_bh_enable(); \ 276ad80b0fcSPaolo Abeni } while (0) 277ad80b0fcSPaolo Abeni 27887952603SPaolo Abeni #define mptcp_data_lock(sk) spin_lock_bh(&(sk)->sk_lock.slock) 27987952603SPaolo Abeni #define mptcp_data_unlock(sk) spin_unlock_bh(&(sk)->sk_lock.slock) 28087952603SPaolo Abeni 281cec37a6eSPeter Krystad #define mptcp_for_each_subflow(__msk, __subflow) \ 282cec37a6eSPeter Krystad list_for_each_entry(__subflow, &((__msk)->conn_list), node) 283cec37a6eSPeter Krystad 2843abc05d9SFlorian Westphal static inline void msk_owned_by_me(const struct mptcp_sock *msk) 2853abc05d9SFlorian Westphal { 2863abc05d9SFlorian Westphal sock_owned_by_me((const struct sock *)msk); 2873abc05d9SFlorian Westphal } 2883abc05d9SFlorian Westphal 289f870fa0bSMat Martineau static inline struct mptcp_sock *mptcp_sk(const struct sock *sk) 290f870fa0bSMat Martineau { 291f870fa0bSMat Martineau return (struct mptcp_sock *)sk; 292f870fa0bSMat Martineau } 293f870fa0bSMat Martineau 294ea4ca586SPaolo Abeni static inline int __mptcp_space(const struct sock *sk) 295ea4ca586SPaolo Abeni { 296e3859603SPaolo Abeni return tcp_space(sk) + READ_ONCE(mptcp_sk(sk)->rmem_released); 297ea4ca586SPaolo Abeni } 298ea4ca586SPaolo Abeni 299f0e6a4cfSPaolo Abeni static inline struct mptcp_data_frag *mptcp_send_head(const struct sock *sk) 300f0e6a4cfSPaolo Abeni { 301f0e6a4cfSPaolo Abeni const struct mptcp_sock *msk = mptcp_sk(sk); 302f0e6a4cfSPaolo Abeni 303f0e6a4cfSPaolo Abeni return READ_ONCE(msk->first_pending); 304f0e6a4cfSPaolo Abeni } 305f0e6a4cfSPaolo Abeni 306f0e6a4cfSPaolo Abeni static inline struct mptcp_data_frag *mptcp_send_next(struct sock *sk) 307f0e6a4cfSPaolo Abeni { 308f0e6a4cfSPaolo Abeni struct mptcp_sock *msk = mptcp_sk(sk); 309f0e6a4cfSPaolo Abeni struct mptcp_data_frag *cur; 310f0e6a4cfSPaolo Abeni 311f0e6a4cfSPaolo Abeni cur = msk->first_pending; 312f0e6a4cfSPaolo Abeni return list_is_last(&cur->list, &msk->rtx_queue) ? NULL : 313f0e6a4cfSPaolo Abeni list_next_entry(cur, list); 314f0e6a4cfSPaolo Abeni } 315f0e6a4cfSPaolo Abeni 316f0e6a4cfSPaolo Abeni static inline struct mptcp_data_frag *mptcp_pending_tail(const struct sock *sk) 317f0e6a4cfSPaolo Abeni { 318f0e6a4cfSPaolo Abeni struct mptcp_sock *msk = mptcp_sk(sk); 319f0e6a4cfSPaolo Abeni 320f0e6a4cfSPaolo Abeni if (!msk->first_pending) 321f0e6a4cfSPaolo Abeni return NULL; 322f0e6a4cfSPaolo Abeni 323f0e6a4cfSPaolo Abeni if (WARN_ON_ONCE(list_empty(&msk->rtx_queue))) 324f0e6a4cfSPaolo Abeni return NULL; 325f0e6a4cfSPaolo Abeni 326f0e6a4cfSPaolo Abeni return list_last_entry(&msk->rtx_queue, struct mptcp_data_frag, list); 327f0e6a4cfSPaolo Abeni } 328f0e6a4cfSPaolo Abeni 3297948f6ccSFlorian Westphal static inline struct mptcp_data_frag *mptcp_rtx_head(const struct sock *sk) 3307948f6ccSFlorian Westphal { 3317948f6ccSFlorian Westphal struct mptcp_sock *msk = mptcp_sk(sk); 3327948f6ccSFlorian Westphal 33364b9cea7SPaolo Abeni if (msk->snd_una == READ_ONCE(msk->snd_nxt)) 33464b9cea7SPaolo Abeni return NULL; 33564b9cea7SPaolo Abeni 336a386bc5bSGeliang Tang return list_first_entry_or_null(&msk->rtx_queue, struct mptcp_data_frag, list); 3377948f6ccSFlorian Westphal } 3387948f6ccSFlorian Westphal 339d0cc2987SGeliang Tang struct csum_pseudo_header { 340d0cc2987SGeliang Tang __be64 data_seq; 341d0cc2987SGeliang Tang __be32 subflow_seq; 342d0cc2987SGeliang Tang __be16 data_len; 343d0cc2987SGeliang Tang __sum16 csum; 344d0cc2987SGeliang Tang }; 345d0cc2987SGeliang Tang 346cec37a6eSPeter Krystad struct mptcp_subflow_request_sock { 347cec37a6eSPeter Krystad struct tcp_request_sock sk; 348d22f4988SChristoph Paasch u16 mp_capable : 1, 349cec37a6eSPeter Krystad mp_join : 1, 350*06fe1719SGeliang Tang backup : 1, 351*06fe1719SGeliang Tang csum_reqd : 1; 3521b1c7a0eSPeter Krystad u8 local_id; 353f296234cSPeter Krystad u8 remote_id; 354cec37a6eSPeter Krystad u64 local_key; 35579c0949eSPeter Krystad u64 idsn; 35679c0949eSPeter Krystad u32 token; 357648ef4b8SMat Martineau u32 ssn_offset; 358f296234cSPeter Krystad u64 thmac; 359f296234cSPeter Krystad u32 local_nonce; 360f296234cSPeter Krystad u32 remote_nonce; 3618fd4de12SPaolo Abeni struct mptcp_sock *msk; 3622c5ebd00SPaolo Abeni struct hlist_nulls_node token_node; 363cec37a6eSPeter Krystad }; 364cec37a6eSPeter Krystad 365cec37a6eSPeter Krystad static inline struct mptcp_subflow_request_sock * 366cec37a6eSPeter Krystad mptcp_subflow_rsk(const struct request_sock *rsk) 367cec37a6eSPeter Krystad { 368cec37a6eSPeter Krystad return (struct mptcp_subflow_request_sock *)rsk; 369cec37a6eSPeter Krystad } 370cec37a6eSPeter Krystad 3716719331cSPaolo Abeni enum mptcp_data_avail { 3726719331cSPaolo Abeni MPTCP_SUBFLOW_NODATA, 3736719331cSPaolo Abeni MPTCP_SUBFLOW_DATA_AVAIL, 3746719331cSPaolo Abeni MPTCP_SUBFLOW_OOO_DATA 3756719331cSPaolo Abeni }; 3766719331cSPaolo Abeni 377b19bc294SPaolo Abeni struct mptcp_delegated_action { 378b19bc294SPaolo Abeni struct napi_struct napi; 379b19bc294SPaolo Abeni struct list_head head; 380b19bc294SPaolo Abeni }; 381b19bc294SPaolo Abeni 382b19bc294SPaolo Abeni DECLARE_PER_CPU(struct mptcp_delegated_action, mptcp_delegated_actions); 383b19bc294SPaolo Abeni 384b19bc294SPaolo Abeni #define MPTCP_DELEGATE_SEND 0 385b19bc294SPaolo Abeni 3862303f994SPeter Krystad /* MPTCP subflow context */ 3872303f994SPeter Krystad struct mptcp_subflow_context { 388cec37a6eSPeter Krystad struct list_head node;/* conn_list of subflows */ 389cec37a6eSPeter Krystad u64 local_key; 390cec37a6eSPeter Krystad u64 remote_key; 39179c0949eSPeter Krystad u64 idsn; 392648ef4b8SMat Martineau u64 map_seq; 393cc7972eaSChristoph Paasch u32 snd_isn; 39479c0949eSPeter Krystad u32 token; 3956d0060f6SMat Martineau u32 rel_write_seq; 396648ef4b8SMat Martineau u32 map_subflow_seq; 397648ef4b8SMat Martineau u32 ssn_offset; 398648ef4b8SMat Martineau u32 map_data_len; 399cec37a6eSPeter Krystad u32 request_mptcp : 1, /* send MP_CAPABLE */ 400ec3edaa7SPeter Krystad request_join : 1, /* send MP_JOIN */ 401ec3edaa7SPeter Krystad request_bkup : 1, 402cec37a6eSPeter Krystad mp_capable : 1, /* remote is MPTCP capable */ 403f296234cSPeter Krystad mp_join : 1, /* remote is JOINing */ 4040be534f5SPaolo Abeni fully_established : 1, /* path validated */ 405f296234cSPeter Krystad pm_notified : 1, /* PM hook called for established status */ 406648ef4b8SMat Martineau conn_finished : 1, 407648ef4b8SMat Martineau map_valid : 1, 408d22f4988SChristoph Paasch mpc_map : 1, 409f296234cSPeter Krystad backup : 1, 41006706542SGeliang Tang send_mp_prio : 1, 411d22f4988SChristoph Paasch rx_eof : 1, 412e16163b6SPaolo Abeni can_ack : 1, /* only after processing the remote a key */ 413e16163b6SPaolo Abeni disposable : 1; /* ctx can be free at ulp release time */ 4146719331cSPaolo Abeni enum mptcp_data_avail data_avail; 415f296234cSPeter Krystad u32 remote_nonce; 416f296234cSPeter Krystad u64 thmac; 417f296234cSPeter Krystad u32 local_nonce; 418ec3edaa7SPeter Krystad u32 remote_token; 419ec3edaa7SPeter Krystad u8 hmac[MPTCPOPT_HMAC_LEN]; 420f296234cSPeter Krystad u8 local_id; 421f296234cSPeter Krystad u8 remote_id; 422dc87efdbSFlorian Westphal u8 reset_seen:1; 423dc87efdbSFlorian Westphal u8 reset_transient:1; 424dc87efdbSFlorian Westphal u8 reset_reason:4; 425648ef4b8SMat Martineau 426b19bc294SPaolo Abeni long delegated_status; 427b19bc294SPaolo Abeni struct list_head delegated_node; /* link into delegated_action, protected by local BH */ 428b19bc294SPaolo Abeni 429df00b087SFlorian Westphal u32 setsockopt_seq; 430df00b087SFlorian Westphal 4312303f994SPeter Krystad struct sock *tcp_sock; /* tcp sk backpointer */ 4322303f994SPeter Krystad struct sock *conn; /* parent mptcp_sock */ 433cec37a6eSPeter Krystad const struct inet_connection_sock_af_ops *icsk_af_ops; 434648ef4b8SMat Martineau void (*tcp_data_ready)(struct sock *sk); 435648ef4b8SMat Martineau void (*tcp_state_change)(struct sock *sk); 436648ef4b8SMat Martineau void (*tcp_write_space)(struct sock *sk); 43715cc1045SPaolo Abeni void (*tcp_error_report)(struct sock *sk); 438648ef4b8SMat Martineau 4392303f994SPeter Krystad struct rcu_head rcu; 4402303f994SPeter Krystad }; 4412303f994SPeter Krystad 4422303f994SPeter Krystad static inline struct mptcp_subflow_context * 4432303f994SPeter Krystad mptcp_subflow_ctx(const struct sock *sk) 4442303f994SPeter Krystad { 4452303f994SPeter Krystad struct inet_connection_sock *icsk = inet_csk(sk); 4462303f994SPeter Krystad 4472303f994SPeter Krystad /* Use RCU on icsk_ulp_data only for sock diag code */ 4482303f994SPeter Krystad return (__force struct mptcp_subflow_context *)icsk->icsk_ulp_data; 4492303f994SPeter Krystad } 4502303f994SPeter Krystad 4512303f994SPeter Krystad static inline struct sock * 4522303f994SPeter Krystad mptcp_subflow_tcp_sock(const struct mptcp_subflow_context *subflow) 4532303f994SPeter Krystad { 4542303f994SPeter Krystad return subflow->tcp_sock; 4552303f994SPeter Krystad } 4562303f994SPeter Krystad 457648ef4b8SMat Martineau static inline u64 458648ef4b8SMat Martineau mptcp_subflow_get_map_offset(const struct mptcp_subflow_context *subflow) 459648ef4b8SMat Martineau { 460648ef4b8SMat Martineau return tcp_sk(mptcp_subflow_tcp_sock(subflow))->copied_seq - 461648ef4b8SMat Martineau subflow->ssn_offset - 462648ef4b8SMat Martineau subflow->map_subflow_seq; 463648ef4b8SMat Martineau } 464648ef4b8SMat Martineau 465648ef4b8SMat Martineau static inline u64 466648ef4b8SMat Martineau mptcp_subflow_get_mapped_dsn(const struct mptcp_subflow_context *subflow) 467648ef4b8SMat Martineau { 468648ef4b8SMat Martineau return subflow->map_seq + mptcp_subflow_get_map_offset(subflow); 469648ef4b8SMat Martineau } 470648ef4b8SMat Martineau 4710397c6d8SPaolo Abeni static inline void mptcp_add_pending_subflow(struct mptcp_sock *msk, 4720397c6d8SPaolo Abeni struct mptcp_subflow_context *subflow) 4730397c6d8SPaolo Abeni { 4740397c6d8SPaolo Abeni sock_hold(mptcp_subflow_tcp_sock(subflow)); 4750397c6d8SPaolo Abeni spin_lock_bh(&msk->join_list_lock); 4760397c6d8SPaolo Abeni list_add_tail(&subflow->node, &msk->join_list); 4770397c6d8SPaolo Abeni spin_unlock_bh(&msk->join_list_lock); 4780397c6d8SPaolo Abeni } 4790397c6d8SPaolo Abeni 480b19bc294SPaolo Abeni void mptcp_subflow_process_delegated(struct sock *ssk); 481b19bc294SPaolo Abeni 482b19bc294SPaolo Abeni static inline void mptcp_subflow_delegate(struct mptcp_subflow_context *subflow) 483b19bc294SPaolo Abeni { 484b19bc294SPaolo Abeni struct mptcp_delegated_action *delegated; 485b19bc294SPaolo Abeni bool schedule; 486b19bc294SPaolo Abeni 487b19bc294SPaolo Abeni /* The implied barrier pairs with mptcp_subflow_delegated_done(), and 488b19bc294SPaolo Abeni * ensures the below list check sees list updates done prior to status 489b19bc294SPaolo Abeni * bit changes 490b19bc294SPaolo Abeni */ 491b19bc294SPaolo Abeni if (!test_and_set_bit(MPTCP_DELEGATE_SEND, &subflow->delegated_status)) { 492b19bc294SPaolo Abeni /* still on delegated list from previous scheduling */ 493b19bc294SPaolo Abeni if (!list_empty(&subflow->delegated_node)) 494b19bc294SPaolo Abeni return; 495b19bc294SPaolo Abeni 496b19bc294SPaolo Abeni /* the caller held the subflow bh socket lock */ 497b19bc294SPaolo Abeni lockdep_assert_in_softirq(); 498b19bc294SPaolo Abeni 499b19bc294SPaolo Abeni delegated = this_cpu_ptr(&mptcp_delegated_actions); 500b19bc294SPaolo Abeni schedule = list_empty(&delegated->head); 501b19bc294SPaolo Abeni list_add_tail(&subflow->delegated_node, &delegated->head); 502b19bc294SPaolo Abeni sock_hold(mptcp_subflow_tcp_sock(subflow)); 503b19bc294SPaolo Abeni if (schedule) 504b19bc294SPaolo Abeni napi_schedule(&delegated->napi); 505b19bc294SPaolo Abeni } 506b19bc294SPaolo Abeni } 507b19bc294SPaolo Abeni 508b19bc294SPaolo Abeni static inline struct mptcp_subflow_context * 509b19bc294SPaolo Abeni mptcp_subflow_delegated_next(struct mptcp_delegated_action *delegated) 510b19bc294SPaolo Abeni { 511b19bc294SPaolo Abeni struct mptcp_subflow_context *ret; 512b19bc294SPaolo Abeni 513b19bc294SPaolo Abeni if (list_empty(&delegated->head)) 514b19bc294SPaolo Abeni return NULL; 515b19bc294SPaolo Abeni 516b19bc294SPaolo Abeni ret = list_first_entry(&delegated->head, struct mptcp_subflow_context, delegated_node); 517b19bc294SPaolo Abeni list_del_init(&ret->delegated_node); 518b19bc294SPaolo Abeni return ret; 519b19bc294SPaolo Abeni } 520b19bc294SPaolo Abeni 521b19bc294SPaolo Abeni static inline bool mptcp_subflow_has_delegated_action(const struct mptcp_subflow_context *subflow) 522b19bc294SPaolo Abeni { 523b19bc294SPaolo Abeni return test_bit(MPTCP_DELEGATE_SEND, &subflow->delegated_status); 524b19bc294SPaolo Abeni } 525b19bc294SPaolo Abeni 526b19bc294SPaolo Abeni static inline void mptcp_subflow_delegated_done(struct mptcp_subflow_context *subflow) 527b19bc294SPaolo Abeni { 528b19bc294SPaolo Abeni /* pairs with mptcp_subflow_delegate, ensures delegate_node is updated before 529b19bc294SPaolo Abeni * touching the status bit 530b19bc294SPaolo Abeni */ 531b19bc294SPaolo Abeni smp_wmb(); 532b19bc294SPaolo Abeni clear_bit(MPTCP_DELEGATE_SEND, &subflow->delegated_status); 533b19bc294SPaolo Abeni } 534b19bc294SPaolo Abeni 535648ef4b8SMat Martineau int mptcp_is_enabled(struct net *net); 53693f323b9SGeliang Tang unsigned int mptcp_get_add_addr_timeout(struct net *net); 537752e9067SGeliang Tang static inline int mptcp_is_checksum_enabled(struct net *net) { return false; } 538b93df08cSPaolo Abeni void mptcp_subflow_fully_established(struct mptcp_subflow_context *subflow, 539b93df08cSPaolo Abeni struct mptcp_options_received *mp_opt); 540648ef4b8SMat Martineau bool mptcp_subflow_data_available(struct sock *sk); 541d39dcecaSPaolo Abeni void __init mptcp_subflow_init(void); 542d0876b22SGeliang Tang void mptcp_subflow_shutdown(struct sock *sk, struct sock *ssk, int how); 543a141e02eSFlorian Westphal void mptcp_close_ssk(struct sock *sk, struct sock *ssk, 544e16163b6SPaolo Abeni struct mptcp_subflow_context *subflow); 545d5824847SPaolo Abeni void mptcp_subflow_reset(struct sock *ssk); 546866f26f2SPaolo Abeni void mptcp_sock_graft(struct sock *sk, struct socket *parent); 5471729cf18SGeliang Tang struct socket *__mptcp_nmpc_socket(const struct mptcp_sock *msk); 548ec3edaa7SPeter Krystad 549ec3edaa7SPeter Krystad /* called with sk socket lock held */ 550ef0da3b8SPaolo Abeni int __mptcp_subflow_connect(struct sock *sk, const struct mptcp_addr_info *loc, 551daa83ab0SGeliang Tang const struct mptcp_addr_info *remote, 552daa83ab0SGeliang Tang u8 flags, int ifindex); 5532303f994SPeter Krystad int mptcp_subflow_create_socket(struct sock *sk, struct socket **new_sock); 5541729cf18SGeliang Tang void mptcp_info2sockaddr(const struct mptcp_addr_info *info, 5551729cf18SGeliang Tang struct sockaddr_storage *addr, 5561729cf18SGeliang Tang unsigned short family); 5572303f994SPeter Krystad 55843f1140bSGeliang Tang static inline bool mptcp_subflow_active(struct mptcp_subflow_context *subflow) 55943f1140bSGeliang Tang { 56043f1140bSGeliang Tang struct sock *ssk = mptcp_subflow_tcp_sock(subflow); 56143f1140bSGeliang Tang 56243f1140bSGeliang Tang /* can't send if JOIN hasn't completed yet (i.e. is usable for mptcp) */ 56343f1140bSGeliang Tang if (subflow->request_join && !subflow->fully_established) 56443f1140bSGeliang Tang return false; 56543f1140bSGeliang Tang 56643f1140bSGeliang Tang /* only send if our side has not closed yet */ 56743f1140bSGeliang Tang return ((1 << ssk->sk_state) & (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT)); 56843f1140bSGeliang Tang } 56943f1140bSGeliang Tang 570648ef4b8SMat Martineau static inline void mptcp_subflow_tcp_fallback(struct sock *sk, 571648ef4b8SMat Martineau struct mptcp_subflow_context *ctx) 572648ef4b8SMat Martineau { 573648ef4b8SMat Martineau sk->sk_data_ready = ctx->tcp_data_ready; 574648ef4b8SMat Martineau sk->sk_state_change = ctx->tcp_state_change; 575648ef4b8SMat Martineau sk->sk_write_space = ctx->tcp_write_space; 57615cc1045SPaolo Abeni sk->sk_error_report = ctx->tcp_error_report; 577648ef4b8SMat Martineau 578648ef4b8SMat Martineau inet_csk(sk)->icsk_af_ops = ctx->icsk_af_ops; 579648ef4b8SMat Martineau } 580648ef4b8SMat Martineau 581d39dcecaSPaolo Abeni void __init mptcp_proto_init(void); 582784325e9SMatthieu Baerts #if IS_ENABLED(CONFIG_MPTCP_IPV6) 583d39dcecaSPaolo Abeni int __init mptcp_proto_v6_init(void); 584784325e9SMatthieu Baerts #endif 585648ef4b8SMat Martineau 586fca5c82cSPaolo Abeni struct sock *mptcp_sk_clone(const struct sock *sk, 587cfde141eSPaolo Abeni const struct mptcp_options_received *mp_opt, 588fca5c82cSPaolo Abeni struct request_sock *req); 589cec37a6eSPeter Krystad void mptcp_get_options(const struct sk_buff *skb, 590cfde141eSPaolo Abeni struct mptcp_options_received *mp_opt); 591cec37a6eSPeter Krystad 592cec37a6eSPeter Krystad void mptcp_finish_connect(struct sock *sk); 593b93df08cSPaolo Abeni static inline bool mptcp_is_fully_established(struct sock *sk) 594b93df08cSPaolo Abeni { 595b93df08cSPaolo Abeni return inet_sk_state_load(sk) == TCP_ESTABLISHED && 596b93df08cSPaolo Abeni READ_ONCE(mptcp_sk(sk)->fully_established); 597b93df08cSPaolo Abeni } 598a6b118feSFlorian Westphal void mptcp_rcv_space_init(struct mptcp_sock *msk, const struct sock *ssk); 5992e52213cSFlorian Westphal void mptcp_data_ready(struct sock *sk, struct sock *ssk); 600f296234cSPeter Krystad bool mptcp_finish_join(struct sock *sk); 601ba8f48f7SPaolo Abeni bool mptcp_schedule_work(struct sock *sk); 6020abdde82SPaolo Abeni int mptcp_setsockopt(struct sock *sk, int level, int optname, 6030abdde82SPaolo Abeni sockptr_t optval, unsigned int optlen); 6040abdde82SPaolo Abeni int mptcp_getsockopt(struct sock *sk, int level, int optname, 6050abdde82SPaolo Abeni char __user *optval, int __user *option); 6060abdde82SPaolo Abeni 607219d0499SPaolo Abeni void __mptcp_check_push(struct sock *sk, struct sock *ssk); 6087439d687SPaolo Abeni void __mptcp_data_acked(struct sock *sk); 60915cc1045SPaolo Abeni void __mptcp_error_report(struct sock *sk); 61059832e24SFlorian Westphal void mptcp_subflow_eof(struct sock *sk); 6111a49b2c2SMat Martineau bool mptcp_update_rcv_data_fin(struct mptcp_sock *msk, u64 data_fin_seq, bool use_64bit); 61284dfe367SGeliang Tang void __mptcp_flush_join_list(struct mptcp_sock *msk); 613e16163b6SPaolo Abeni static inline bool mptcp_data_fin_enabled(const struct mptcp_sock *msk) 614e16163b6SPaolo Abeni { 615e16163b6SPaolo Abeni return READ_ONCE(msk->snd_data_fin_enable) && 616e16163b6SPaolo Abeni READ_ONCE(msk->write_seq) == READ_ONCE(msk->snd_nxt); 617e16163b6SPaolo Abeni } 618e16163b6SPaolo Abeni 6195cf92bbaSPaolo Abeni static inline bool mptcp_propagate_sndbuf(struct sock *sk, struct sock *ssk) 6205cf92bbaSPaolo Abeni { 6215cf92bbaSPaolo Abeni if ((sk->sk_userlocks & SOCK_SNDBUF_LOCK) || ssk->sk_sndbuf <= READ_ONCE(sk->sk_sndbuf)) 6225cf92bbaSPaolo Abeni return false; 6235cf92bbaSPaolo Abeni 6245cf92bbaSPaolo Abeni WRITE_ONCE(sk->sk_sndbuf, ssk->sk_sndbuf); 6255cf92bbaSPaolo Abeni return true; 6265cf92bbaSPaolo Abeni } 6275cf92bbaSPaolo Abeni 6285cf92bbaSPaolo Abeni static inline void mptcp_write_space(struct sock *sk) 6295cf92bbaSPaolo Abeni { 6305cf92bbaSPaolo Abeni if (sk_stream_is_writeable(sk)) { 6315cf92bbaSPaolo Abeni /* pairs with memory barrier in mptcp_poll */ 6325cf92bbaSPaolo Abeni smp_mb(); 6335cf92bbaSPaolo Abeni if (test_and_clear_bit(MPTCP_NOSPACE, &mptcp_sk(sk)->flags)) 6345cf92bbaSPaolo Abeni sk_stream_write_space(sk); 6355cf92bbaSPaolo Abeni } 6365cf92bbaSPaolo Abeni } 6375cf92bbaSPaolo Abeni 6385c8c1640SGeliang Tang void mptcp_destroy_common(struct mptcp_sock *msk); 639cec37a6eSPeter Krystad 640c68a0cd1SJianguo Wu #define MPTCP_TOKEN_MAX_RETRIES 4 641c68a0cd1SJianguo Wu 6422c5ebd00SPaolo Abeni void __init mptcp_token_init(void); 6432c5ebd00SPaolo Abeni static inline void mptcp_token_init_request(struct request_sock *req) 6442c5ebd00SPaolo Abeni { 6452c5ebd00SPaolo Abeni mptcp_subflow_rsk(req)->token_node.pprev = NULL; 6462c5ebd00SPaolo Abeni } 6472c5ebd00SPaolo Abeni 64879c0949eSPeter Krystad int mptcp_token_new_request(struct request_sock *req); 6492c5ebd00SPaolo Abeni void mptcp_token_destroy_request(struct request_sock *req); 65079c0949eSPeter Krystad int mptcp_token_new_connect(struct sock *sk); 6512c5ebd00SPaolo Abeni void mptcp_token_accept(struct mptcp_subflow_request_sock *r, 6522c5ebd00SPaolo Abeni struct mptcp_sock *msk); 653c83a47e5SFlorian Westphal bool mptcp_token_exists(u32 token); 654f296234cSPeter Krystad struct mptcp_sock *mptcp_token_get_sock(u32 token); 65596d890daSPaolo Abeni struct mptcp_sock *mptcp_token_iter_next(const struct net *net, long *s_slot, 65696d890daSPaolo Abeni long *s_num); 6572c5ebd00SPaolo Abeni void mptcp_token_destroy(struct mptcp_sock *msk); 65879c0949eSPeter Krystad 65979c0949eSPeter Krystad void mptcp_crypto_key_sha(u64 key, u32 *token, u64 *idsn); 66079c0949eSPeter Krystad 6613df523abSPeter Krystad void mptcp_crypto_hmac_sha(u64 key1, u64 key2, u8 *msg, int len, void *hmac); 66279c0949eSPeter Krystad 663d39dcecaSPaolo Abeni void __init mptcp_pm_init(void); 6641b1c7a0eSPeter Krystad void mptcp_pm_data_init(struct mptcp_sock *msk); 6656c714f1bSFlorian Westphal void mptcp_pm_new_connection(struct mptcp_sock *msk, const struct sock *ssk, int server_side); 6666c714f1bSFlorian Westphal void mptcp_pm_fully_established(struct mptcp_sock *msk, const struct sock *ssk, gfp_t gfp); 6671b1c7a0eSPeter Krystad bool mptcp_pm_allow_new_subflow(struct mptcp_sock *msk); 6681b1c7a0eSPeter Krystad void mptcp_pm_connection_closed(struct mptcp_sock *msk); 66962535200SGeliang Tang void mptcp_pm_subflow_established(struct mptcp_sock *msk); 6701b1c7a0eSPeter Krystad void mptcp_pm_subflow_closed(struct mptcp_sock *msk, u8 id); 6711b1c7a0eSPeter Krystad void mptcp_pm_add_addr_received(struct mptcp_sock *msk, 6721b1c7a0eSPeter Krystad const struct mptcp_addr_info *addr); 673557963c3SGeliang Tang void mptcp_pm_add_addr_echoed(struct mptcp_sock *msk, 674557963c3SGeliang Tang struct mptcp_addr_info *addr); 67584dfe367SGeliang Tang void mptcp_pm_add_addr_send_ack(struct mptcp_sock *msk); 676b46a0238SGeliang Tang void mptcp_pm_nl_addr_send_ack(struct mptcp_sock *msk); 6775c4a824dSGeliang Tang void mptcp_pm_rm_addr_received(struct mptcp_sock *msk, 6785c4a824dSGeliang Tang const struct mptcp_rm_list *rm_list); 67940453a5cSGeliang Tang void mptcp_pm_mp_prio_received(struct sock *sk, u8 bkup); 68006706542SGeliang Tang int mptcp_pm_nl_mp_prio_send_ack(struct mptcp_sock *msk, 68106706542SGeliang Tang struct mptcp_addr_info *addr, 68206706542SGeliang Tang u8 bkup); 683b6c08380SGeliang Tang void mptcp_pm_free_anno_list(struct mptcp_sock *msk); 6845bc56388SGeliang Tang bool mptcp_pm_sport_in_anno_list(struct mptcp_sock *msk, const struct sock *sk); 68500cfd77bSGeliang Tang struct mptcp_pm_add_entry * 68600cfd77bSGeliang Tang mptcp_pm_del_add_timer(struct mptcp_sock *msk, 687d58300c3SDavide Caratti struct mptcp_addr_info *addr, bool check_id); 688d88c476fSGeliang Tang struct mptcp_pm_add_entry * 689d88c476fSGeliang Tang mptcp_lookup_anno_list_by_saddr(struct mptcp_sock *msk, 690d88c476fSGeliang Tang struct mptcp_addr_info *addr); 6911b1c7a0eSPeter Krystad 6921b1c7a0eSPeter Krystad int mptcp_pm_announce_addr(struct mptcp_sock *msk, 6936a6c05a8SGeliang Tang const struct mptcp_addr_info *addr, 694f7efc777SGeliang Tang bool echo); 695cbde2787SGeliang Tang int mptcp_pm_remove_addr(struct mptcp_sock *msk, const struct mptcp_rm_list *rm_list); 696ddd14bb8SGeliang Tang int mptcp_pm_remove_subflow(struct mptcp_sock *msk, const struct mptcp_rm_list *rm_list); 6971b1c7a0eSPeter Krystad 698b911c97cSFlorian Westphal void mptcp_event(enum mptcp_event_type type, const struct mptcp_sock *msk, 699b911c97cSFlorian Westphal const struct sock *ssk, gfp_t gfp); 700b911c97cSFlorian Westphal void mptcp_event_addr_announced(const struct mptcp_sock *msk, const struct mptcp_addr_info *info); 701b911c97cSFlorian Westphal void mptcp_event_addr_removed(const struct mptcp_sock *msk, u8 id); 702b911c97cSFlorian Westphal 703f643b803SGeliang Tang static inline bool mptcp_pm_should_add_signal(struct mptcp_sock *msk) 7041b1c7a0eSPeter Krystad { 70513ad9f01SGeliang Tang return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_SIGNAL); 706d91d322aSGeliang Tang } 707d91d322aSGeliang Tang 708d91d322aSGeliang Tang static inline bool mptcp_pm_should_add_signal_echo(struct mptcp_sock *msk) 709d91d322aSGeliang Tang { 71013ad9f01SGeliang Tang return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_ECHO); 7111b1c7a0eSPeter Krystad } 7121b1c7a0eSPeter Krystad 71384dfe367SGeliang Tang static inline bool mptcp_pm_should_add_signal_ipv6(struct mptcp_sock *msk) 71484dfe367SGeliang Tang { 71513ad9f01SGeliang Tang return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_IPV6); 71684dfe367SGeliang Tang } 71784dfe367SGeliang Tang 7184a2777a8SGeliang Tang static inline bool mptcp_pm_should_add_signal_port(struct mptcp_sock *msk) 7194a2777a8SGeliang Tang { 72013ad9f01SGeliang Tang return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_PORT); 7214a2777a8SGeliang Tang } 7224a2777a8SGeliang Tang 7235cb104aeSGeliang Tang static inline bool mptcp_pm_should_rm_signal(struct mptcp_sock *msk) 7245cb104aeSGeliang Tang { 72513ad9f01SGeliang Tang return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_RM_ADDR_SIGNAL); 7265cb104aeSGeliang Tang } 7275cb104aeSGeliang Tang 7284a2777a8SGeliang Tang static inline unsigned int mptcp_add_addr_len(int family, bool echo, bool port) 7291b1c7a0eSPeter Krystad { 7302ec72faeSGeliang Tang u8 len = TCPOLEN_MPTCP_ADD_ADDR_BASE; 7312ec72faeSGeliang Tang 7322ec72faeSGeliang Tang if (family == AF_INET6) 7332ec72faeSGeliang Tang len = TCPOLEN_MPTCP_ADD_ADDR6_BASE; 7342ec72faeSGeliang Tang if (!echo) 7352ec72faeSGeliang Tang len += MPTCPOPT_THMAC_LEN; 73627ab92d9SDavide Caratti /* account for 2 trailing 'nop' options */ 7374a2777a8SGeliang Tang if (port) 73827ab92d9SDavide Caratti len += TCPOLEN_MPTCP_PORT_LEN + TCPOLEN_MPTCP_PORT_ALIGN; 7392ec72faeSGeliang Tang 7402ec72faeSGeliang Tang return len; 7411b1c7a0eSPeter Krystad } 7421b1c7a0eSPeter Krystad 7436445e17aSGeliang Tang static inline int mptcp_rm_addr_len(const struct mptcp_rm_list *rm_list) 7446445e17aSGeliang Tang { 7456445e17aSGeliang Tang if (rm_list->nr == 0 || rm_list->nr > MPTCP_RM_IDS_MAX) 7466445e17aSGeliang Tang return -EINVAL; 7476445e17aSGeliang Tang 7486445e17aSGeliang Tang return TCPOLEN_MPTCP_RM_ADDR_BASE + roundup(rm_list->nr - 1, 4) + 1; 7496445e17aSGeliang Tang } 7506445e17aSGeliang Tang 751f643b803SGeliang Tang bool mptcp_pm_add_addr_signal(struct mptcp_sock *msk, unsigned int remaining, 7524a2777a8SGeliang Tang struct mptcp_addr_info *saddr, bool *echo, bool *port); 7535cb104aeSGeliang Tang bool mptcp_pm_rm_addr_signal(struct mptcp_sock *msk, unsigned int remaining, 7546445e17aSGeliang Tang struct mptcp_rm_list *rm_list); 7551b1c7a0eSPeter Krystad int mptcp_pm_get_local_id(struct mptcp_sock *msk, struct sock_common *skc); 7561b1c7a0eSPeter Krystad 757d39dcecaSPaolo Abeni void __init mptcp_pm_nl_init(void); 75801cacb00SPaolo Abeni void mptcp_pm_nl_data_init(struct mptcp_sock *msk); 759e9801430SFlorian Westphal void mptcp_pm_nl_work(struct mptcp_sock *msk); 760ddd14bb8SGeliang Tang void mptcp_pm_nl_rm_subflow_received(struct mptcp_sock *msk, 761ddd14bb8SGeliang Tang const struct mptcp_rm_list *rm_list); 76201cacb00SPaolo Abeni int mptcp_pm_nl_get_local_id(struct mptcp_sock *msk, struct sock_common *skc); 763a914e586SGeliang Tang unsigned int mptcp_pm_get_add_addr_signal_max(struct mptcp_sock *msk); 764a914e586SGeliang Tang unsigned int mptcp_pm_get_add_addr_accept_max(struct mptcp_sock *msk); 765a914e586SGeliang Tang unsigned int mptcp_pm_get_subflows_max(struct mptcp_sock *msk); 7660caf3adaSGeliang Tang unsigned int mptcp_pm_get_local_addr_max(struct mptcp_sock *msk); 76701cacb00SPaolo Abeni 76878962489SFlorian Westphal int mptcp_setsockopt(struct sock *sk, int level, int optname, 76978962489SFlorian Westphal sockptr_t optval, unsigned int optlen); 77078962489SFlorian Westphal 77178962489SFlorian Westphal void mptcp_sockopt_sync(struct mptcp_sock *msk, struct sock *ssk); 77278962489SFlorian Westphal void mptcp_sockopt_sync_all(struct mptcp_sock *msk); 77378962489SFlorian Westphal 774dc87efdbSFlorian Westphal static inline struct mptcp_ext *mptcp_get_ext(const struct sk_buff *skb) 7756d0060f6SMat Martineau { 7766d0060f6SMat Martineau return (struct mptcp_ext *)skb_ext_find(skb, SKB_EXT_MPTCP); 7776d0060f6SMat Martineau } 7786d0060f6SMat Martineau 7795147dfb5SDavide Caratti void mptcp_diag_subflow_init(struct tcp_ulp_ops *ops); 7805147dfb5SDavide Caratti 781d5f49190SPaolo Abeni static inline bool __mptcp_check_fallback(const struct mptcp_sock *msk) 782e1ff9e82SDavide Caratti { 783e1ff9e82SDavide Caratti return test_bit(MPTCP_FALLBACK_DONE, &msk->flags); 784e1ff9e82SDavide Caratti } 785e1ff9e82SDavide Caratti 786d5f49190SPaolo Abeni static inline bool mptcp_check_fallback(const struct sock *sk) 787e1ff9e82SDavide Caratti { 788e1ff9e82SDavide Caratti struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); 789e1ff9e82SDavide Caratti struct mptcp_sock *msk = mptcp_sk(subflow->conn); 790e1ff9e82SDavide Caratti 791e1ff9e82SDavide Caratti return __mptcp_check_fallback(msk); 792e1ff9e82SDavide Caratti } 793e1ff9e82SDavide Caratti 794e1ff9e82SDavide Caratti static inline void __mptcp_do_fallback(struct mptcp_sock *msk) 795e1ff9e82SDavide Caratti { 796e1ff9e82SDavide Caratti if (test_bit(MPTCP_FALLBACK_DONE, &msk->flags)) { 797e1ff9e82SDavide Caratti pr_debug("TCP fallback already done (msk=%p)", msk); 798e1ff9e82SDavide Caratti return; 799e1ff9e82SDavide Caratti } 800e1ff9e82SDavide Caratti set_bit(MPTCP_FALLBACK_DONE, &msk->flags); 801e1ff9e82SDavide Caratti } 802e1ff9e82SDavide Caratti 803e1ff9e82SDavide Caratti static inline void mptcp_do_fallback(struct sock *sk) 804e1ff9e82SDavide Caratti { 805e1ff9e82SDavide Caratti struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); 806e1ff9e82SDavide Caratti struct mptcp_sock *msk = mptcp_sk(subflow->conn); 807e1ff9e82SDavide Caratti 808e1ff9e82SDavide Caratti __mptcp_do_fallback(msk); 809e1ff9e82SDavide Caratti } 810e1ff9e82SDavide Caratti 811e1ff9e82SDavide Caratti #define pr_fallback(a) pr_debug("%s:fallback to TCP (msk=%p)", __func__, a) 812e1ff9e82SDavide Caratti 8138fd73804SDavide Caratti static inline bool subflow_simultaneous_connect(struct sock *sk) 8148fd73804SDavide Caratti { 8158fd73804SDavide Caratti struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); 8168fd73804SDavide Caratti struct sock *parent = subflow->conn; 8178fd73804SDavide Caratti 8188fd73804SDavide Caratti return sk->sk_state == TCP_ESTABLISHED && 8198fd73804SDavide Caratti !mptcp_sk(parent)->pm.server_side && 8208fd73804SDavide Caratti !subflow->conn_finished; 8218fd73804SDavide Caratti } 8228fd73804SDavide Caratti 8239466a1ccSFlorian Westphal #ifdef CONFIG_SYN_COOKIES 8249466a1ccSFlorian Westphal void subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req, 8259466a1ccSFlorian Westphal struct sk_buff *skb); 8269466a1ccSFlorian Westphal bool mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req, 8279466a1ccSFlorian Westphal struct sk_buff *skb); 8289466a1ccSFlorian Westphal void __init mptcp_join_cookie_init(void); 8299466a1ccSFlorian Westphal #else 8309466a1ccSFlorian Westphal static inline void 8319466a1ccSFlorian Westphal subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req, 8329466a1ccSFlorian Westphal struct sk_buff *skb) {} 8339466a1ccSFlorian Westphal static inline bool 8349466a1ccSFlorian Westphal mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req, 8359466a1ccSFlorian Westphal struct sk_buff *skb) 8369466a1ccSFlorian Westphal { 8379466a1ccSFlorian Westphal return false; 8389466a1ccSFlorian Westphal } 8399466a1ccSFlorian Westphal 8409466a1ccSFlorian Westphal static inline void mptcp_join_cookie_init(void) {} 8419466a1ccSFlorian Westphal #endif 8429466a1ccSFlorian Westphal 843f870fa0bSMat Martineau #endif /* __MPTCP_PROTOCOL_H */ 844