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) 291bff1e43SPaolo Abeni #define OPTION_MPTCP_DSS BIT(11) 30c25aeb4eSGeliang Tang #define OPTION_MPTCP_FAIL BIT(12) 31eda7acddSPeter Krystad 3274c7dfbeSPaolo Abeni #define OPTION_MPTCP_CSUMREQD BIT(13) 3374c7dfbeSPaolo Abeni 3474c7dfbeSPaolo Abeni #define OPTIONS_MPTCP_MPC (OPTION_MPTCP_MPC_SYN | OPTION_MPTCP_MPC_SYNACK | \ 3574c7dfbeSPaolo Abeni OPTION_MPTCP_MPC_ACK) 3674c7dfbeSPaolo Abeni #define OPTIONS_MPTCP_MPJ (OPTION_MPTCP_MPJ_SYN | OPTION_MPTCP_MPJ_SYNACK | \ 37780aa120SWan Jiabing OPTION_MPTCP_MPJ_ACK) 3874c7dfbeSPaolo Abeni 39eda7acddSPeter Krystad /* MPTCP option subtypes */ 40eda7acddSPeter Krystad #define MPTCPOPT_MP_CAPABLE 0 41eda7acddSPeter Krystad #define MPTCPOPT_MP_JOIN 1 42eda7acddSPeter Krystad #define MPTCPOPT_DSS 2 43eda7acddSPeter Krystad #define MPTCPOPT_ADD_ADDR 3 44eda7acddSPeter Krystad #define MPTCPOPT_RM_ADDR 4 45eda7acddSPeter Krystad #define MPTCPOPT_MP_PRIO 5 46eda7acddSPeter Krystad #define MPTCPOPT_MP_FAIL 6 47eda7acddSPeter Krystad #define MPTCPOPT_MP_FASTCLOSE 7 48dc87efdbSFlorian Westphal #define MPTCPOPT_RST 8 49eda7acddSPeter Krystad 50eda7acddSPeter Krystad /* MPTCP suboption lengths */ 51cc7972eaSChristoph Paasch #define TCPOLEN_MPTCP_MPC_SYN 4 52eda7acddSPeter Krystad #define TCPOLEN_MPTCP_MPC_SYNACK 12 53eda7acddSPeter Krystad #define TCPOLEN_MPTCP_MPC_ACK 20 54cc7972eaSChristoph Paasch #define TCPOLEN_MPTCP_MPC_ACK_DATA 22 55f296234cSPeter Krystad #define TCPOLEN_MPTCP_MPJ_SYN 12 56f296234cSPeter Krystad #define TCPOLEN_MPTCP_MPJ_SYNACK 16 57f296234cSPeter Krystad #define TCPOLEN_MPTCP_MPJ_ACK 24 586d0060f6SMat Martineau #define TCPOLEN_MPTCP_DSS_BASE 4 59648ef4b8SMat Martineau #define TCPOLEN_MPTCP_DSS_ACK32 4 606d0060f6SMat Martineau #define TCPOLEN_MPTCP_DSS_ACK64 8 61648ef4b8SMat Martineau #define TCPOLEN_MPTCP_DSS_MAP32 10 626d0060f6SMat Martineau #define TCPOLEN_MPTCP_DSS_MAP64 14 636d0060f6SMat Martineau #define TCPOLEN_MPTCP_DSS_CHECKSUM 2 643df523abSPeter Krystad #define TCPOLEN_MPTCP_ADD_ADDR 16 6527ab92d9SDavide Caratti #define TCPOLEN_MPTCP_ADD_ADDR_PORT 18 663df523abSPeter Krystad #define TCPOLEN_MPTCP_ADD_ADDR_BASE 8 6727ab92d9SDavide Caratti #define TCPOLEN_MPTCP_ADD_ADDR_BASE_PORT 10 683df523abSPeter Krystad #define TCPOLEN_MPTCP_ADD_ADDR6 28 6927ab92d9SDavide Caratti #define TCPOLEN_MPTCP_ADD_ADDR6_PORT 30 703df523abSPeter Krystad #define TCPOLEN_MPTCP_ADD_ADDR6_BASE 20 7127ab92d9SDavide Caratti #define TCPOLEN_MPTCP_ADD_ADDR6_BASE_PORT 22 7227ab92d9SDavide Caratti #define TCPOLEN_MPTCP_PORT_LEN 2 7327ab92d9SDavide Caratti #define TCPOLEN_MPTCP_PORT_ALIGN 2 746445e17aSGeliang Tang #define TCPOLEN_MPTCP_RM_ADDR_BASE 3 75ec99a470SDavide Caratti #define TCPOLEN_MPTCP_PRIO 3 76ec99a470SDavide Caratti #define TCPOLEN_MPTCP_PRIO_ALIGN 4 7750c504a2SFlorian Westphal #define TCPOLEN_MPTCP_FASTCLOSE 12 78dc87efdbSFlorian Westphal #define TCPOLEN_MPTCP_RST 4 79c25aeb4eSGeliang Tang #define TCPOLEN_MPTCP_FAIL 12 80eda7acddSPeter Krystad 81208e8f66SGeliang Tang #define TCPOLEN_MPTCP_MPC_ACK_DATA_CSUM (TCPOLEN_MPTCP_DSS_CHECKSUM + TCPOLEN_MPTCP_MPC_ACK_DATA) 82208e8f66SGeliang Tang 83ec3edaa7SPeter Krystad /* MPTCP MP_JOIN flags */ 84f296234cSPeter Krystad #define MPTCPOPT_BACKUP BIT(0) 85f296234cSPeter Krystad #define MPTCPOPT_HMAC_LEN 20 86ec3edaa7SPeter Krystad #define MPTCPOPT_THMAC_LEN 8 87f296234cSPeter Krystad 88eda7acddSPeter Krystad /* MPTCP MP_CAPABLE flags */ 89eda7acddSPeter Krystad #define MPTCP_VERSION_MASK (0x0F) 90eda7acddSPeter Krystad #define MPTCP_CAP_CHECKSUM_REQD BIT(7) 91eda7acddSPeter Krystad #define MPTCP_CAP_EXTENSIBILITY BIT(6) 92bab6b88eSGeliang Tang #define MPTCP_CAP_DENY_JOIN_ID0 BIT(5) 9365492c5aSPaolo Abeni #define MPTCP_CAP_HMAC_SHA256 BIT(0) 94bab6b88eSGeliang Tang #define MPTCP_CAP_FLAG_MASK (0x1F) 95eda7acddSPeter Krystad 966d0060f6SMat Martineau /* MPTCP DSS flags */ 976d0060f6SMat Martineau #define MPTCP_DSS_DATA_FIN BIT(4) 986d0060f6SMat Martineau #define MPTCP_DSS_DSN64 BIT(3) 996d0060f6SMat Martineau #define MPTCP_DSS_HAS_MAP BIT(2) 1006d0060f6SMat Martineau #define MPTCP_DSS_ACK64 BIT(1) 1016d0060f6SMat Martineau #define MPTCP_DSS_HAS_ACK BIT(0) 102648ef4b8SMat Martineau #define MPTCP_DSS_FLAG_MASK (0x1F) 103648ef4b8SMat Martineau 1043df523abSPeter Krystad /* MPTCP ADD_ADDR flags */ 1053df523abSPeter Krystad #define MPTCP_ADDR_ECHO BIT(0) 1063df523abSPeter Krystad 10740453a5cSGeliang Tang /* MPTCP MP_PRIO flags */ 10840453a5cSGeliang Tang #define MPTCP_PRIO_BKUP BIT(0) 10940453a5cSGeliang Tang 110dc87efdbSFlorian Westphal /* MPTCP TCPRST flags */ 111dc87efdbSFlorian Westphal #define MPTCP_RST_TRANSIENT BIT(0) 112dc87efdbSFlorian Westphal 113e9d09bacSPaolo Abeni /* MPTCP socket atomic flags */ 1148edf0864SFlorian Westphal #define MPTCP_NOSPACE 1 1153b1d6210SPaolo Abeni #define MPTCP_WORK_RTX 2 11659832e24SFlorian Westphal #define MPTCP_WORK_EOF 3 117e1ff9e82SDavide Caratti #define MPTCP_FALLBACK_DONE 4 1180e4f35d7SPaolo Abeni #define MPTCP_WORK_CLOSE_SUBFLOW 5 11949fa1919SGeliang Tang #define MPTCP_FAIL_NO_RESPONSE 6 120e9d09bacSPaolo Abeni 121e9d09bacSPaolo Abeni /* MPTCP socket release cb flags */ 122e9d09bacSPaolo Abeni #define MPTCP_PUSH_PENDING 1 123e9d09bacSPaolo Abeni #define MPTCP_CLEAN_UNA 2 124e9d09bacSPaolo Abeni #define MPTCP_ERROR_REPORT 3 125e9d09bacSPaolo Abeni #define MPTCP_RETRANSMIT 4 126e9d09bacSPaolo Abeni #define MPTCP_FLUSH_JOIN_LIST 5 127e9d09bacSPaolo Abeni #define MPTCP_CONNECTED 6 12843f5b111SPaolo Abeni #define MPTCP_RESET_SCHEDULER 7 1296d0060f6SMat Martineau 130eaa2ffabSPaolo Abeni static inline bool before64(__u64 seq1, __u64 seq2) 131eaa2ffabSPaolo Abeni { 132eaa2ffabSPaolo Abeni return (__s64)(seq1 - seq2) < 0; 133eaa2ffabSPaolo Abeni } 134eaa2ffabSPaolo Abeni 135eaa2ffabSPaolo Abeni #define after64(seq2, seq1) before64(seq1, seq2) 136eaa2ffabSPaolo Abeni 137cfde141eSPaolo Abeni struct mptcp_options_received { 138cfde141eSPaolo Abeni u64 sndr_key; 139cfde141eSPaolo Abeni u64 rcvr_key; 140cfde141eSPaolo Abeni u64 data_ack; 141cfde141eSPaolo Abeni u64 data_seq; 142cfde141eSPaolo Abeni u32 subflow_seq; 143cfde141eSPaolo Abeni u16 data_len; 144208e8f66SGeliang Tang __sum16 csum; 14574c7dfbeSPaolo Abeni u16 suboptions; 146cfde141eSPaolo Abeni u32 token; 147cfde141eSPaolo Abeni u32 nonce; 148a086aebaSPaolo Abeni u16 use_map:1, 149cfde141eSPaolo Abeni dsn64:1, 150cfde141eSPaolo Abeni data_fin:1, 151cfde141eSPaolo Abeni use_ack:1, 152cfde141eSPaolo Abeni ack64:1, 153cfde141eSPaolo Abeni mpc_map:1, 154a086aebaSPaolo Abeni reset_reason:4, 155a086aebaSPaolo Abeni reset_transient:1, 156a086aebaSPaolo Abeni echo:1, 157a086aebaSPaolo Abeni backup:1, 158a086aebaSPaolo Abeni deny_join_id0:1, 159cfde141eSPaolo Abeni __unused:2; 160a086aebaSPaolo Abeni u8 join_id; 161a086aebaSPaolo Abeni u64 thmac; 162a086aebaSPaolo Abeni u8 hmac[MPTCPOPT_HMAC_LEN]; 163f7dafee1SGeliang Tang struct mptcp_addr_info addr; 1645c4a824dSGeliang Tang struct mptcp_rm_list rm_list; 165cfde141eSPaolo Abeni u64 ahmac; 1665580d41bSGeliang Tang u64 fail_seq; 167cfde141eSPaolo Abeni }; 168cfde141eSPaolo Abeni 1693df523abSPeter Krystad static inline __be32 mptcp_option(u8 subopt, u8 len, u8 nib, u8 field) 1703df523abSPeter Krystad { 1713df523abSPeter Krystad return htonl((TCPOPT_MPTCP << 24) | (len << 16) | (subopt << 12) | 1723df523abSPeter Krystad ((nib & 0xF) << 8) | field); 1733df523abSPeter Krystad } 1743df523abSPeter Krystad 1751b1c7a0eSPeter Krystad enum mptcp_pm_status { 1761b1c7a0eSPeter Krystad MPTCP_PM_ADD_ADDR_RECEIVED, 17784dfe367SGeliang Tang MPTCP_PM_ADD_ADDR_SEND_ACK, 178d0876b22SGeliang Tang MPTCP_PM_RM_ADDR_RECEIVED, 1791b1c7a0eSPeter Krystad MPTCP_PM_ESTABLISHED, 1801b1c7a0eSPeter Krystad MPTCP_PM_SUBFLOW_ESTABLISHED, 18186e39e04SPaolo Abeni MPTCP_PM_ALREADY_ESTABLISHED, /* persistent status, set after ESTABLISHED event */ 18286e39e04SPaolo Abeni MPTCP_PM_MPC_ENDPOINT_ACCOUNTED /* persistent status, set after MPC local address is 18386e39e04SPaolo Abeni * accounted int id_avail_bitmap 18486e39e04SPaolo Abeni */ 1851b1c7a0eSPeter Krystad }; 1861b1c7a0eSPeter Krystad 187*d85a8fdeSMat Martineau enum mptcp_pm_type { 188*d85a8fdeSMat Martineau MPTCP_PM_TYPE_KERNEL = 0, 189*d85a8fdeSMat Martineau MPTCP_PM_TYPE_USERSPACE, 190*d85a8fdeSMat Martineau 191*d85a8fdeSMat Martineau __MPTCP_PM_TYPE_NR, 192*d85a8fdeSMat Martineau __MPTCP_PM_TYPE_MAX = __MPTCP_PM_TYPE_NR - 1, 193*d85a8fdeSMat Martineau }; 194*d85a8fdeSMat Martineau 19586e39e04SPaolo Abeni /* Status bits below MPTCP_PM_ALREADY_ESTABLISHED need pm worker actions */ 19686e39e04SPaolo Abeni #define MPTCP_PM_WORK_MASK ((1 << MPTCP_PM_ALREADY_ESTABLISHED) - 1) 19786e39e04SPaolo Abeni 19813ad9f01SGeliang Tang enum mptcp_addr_signal_status { 199d91d322aSGeliang Tang MPTCP_ADD_ADDR_SIGNAL, 200d91d322aSGeliang Tang MPTCP_ADD_ADDR_ECHO, 20142842a42SGeliang Tang MPTCP_RM_ADDR_SIGNAL, 202d91d322aSGeliang Tang }; 203d91d322aSGeliang Tang 20486e39e04SPaolo Abeni /* max value of mptcp_addr_info.id */ 20586e39e04SPaolo Abeni #define MPTCP_PM_MAX_ADDR_ID U8_MAX 20686e39e04SPaolo Abeni 2071b1c7a0eSPeter Krystad struct mptcp_pm_data { 2081b1c7a0eSPeter Krystad struct mptcp_addr_info local; 2091b1c7a0eSPeter Krystad struct mptcp_addr_info remote; 210b6c08380SGeliang Tang struct list_head anno_list; 2111b1c7a0eSPeter Krystad 2121b1c7a0eSPeter Krystad spinlock_t lock; /*protects the whole PM data */ 2131b1c7a0eSPeter Krystad 21413ad9f01SGeliang Tang u8 addr_signal; 2151b1c7a0eSPeter Krystad bool server_side; 2161b1c7a0eSPeter Krystad bool work_pending; 2171b1c7a0eSPeter Krystad bool accept_addr; 2181b1c7a0eSPeter Krystad bool accept_subflow; 219df377be3SGeliang Tang bool remote_deny_join_id0; 2201b1c7a0eSPeter Krystad u8 add_addr_signaled; 2211b1c7a0eSPeter Krystad u8 add_addr_accepted; 2221b1c7a0eSPeter Krystad u8 local_addr_used; 223*d85a8fdeSMat Martineau u8 pm_type; 2241b1c7a0eSPeter Krystad u8 subflows; 2251b1c7a0eSPeter Krystad u8 status; 22686e39e04SPaolo Abeni DECLARE_BITMAP(id_avail_bitmap, MPTCP_PM_MAX_ADDR_ID + 1); 227cbde2787SGeliang Tang struct mptcp_rm_list rm_list_tx; 228b5c55f33SGeliang Tang struct mptcp_rm_list rm_list_rx; 2291b1c7a0eSPeter Krystad }; 2301b1c7a0eSPeter Krystad 23118b683bfSPaolo Abeni struct mptcp_data_frag { 23218b683bfSPaolo Abeni struct list_head list; 23318b683bfSPaolo Abeni u64 data_seq; 234f0e6a4cfSPaolo Abeni u16 data_len; 235f0e6a4cfSPaolo Abeni u16 offset; 236f0e6a4cfSPaolo Abeni u16 overhead; 237f0e6a4cfSPaolo Abeni u16 already_sent; 23818b683bfSPaolo Abeni struct page *page; 23918b683bfSPaolo Abeni }; 24018b683bfSPaolo Abeni 241f870fa0bSMat Martineau /* MPTCP connection sock */ 242f870fa0bSMat Martineau struct mptcp_sock { 243f870fa0bSMat Martineau /* inet_connection_sock must be the first member */ 244f870fa0bSMat Martineau struct inet_connection_sock sk; 245cec37a6eSPeter Krystad u64 local_key; 246cec37a6eSPeter Krystad u64 remote_key; 2476d0060f6SMat Martineau u64 write_seq; 248eaa2ffabSPaolo Abeni u64 snd_nxt; 2496d0060f6SMat Martineau u64 ack_seq; 250fa3fe2b1SFlorian Westphal u64 rcv_wnd_sent; 2513721b9b6SMat Martineau u64 rcv_data_fin_seq; 2526511882cSPaolo Abeni int rmem_fwd_alloc; 253d5f49190SPaolo Abeni struct sock *last_snd; 254d5f49190SPaolo Abeni int snd_burst; 255ea4ca586SPaolo Abeni int old_wspace; 2561e1d9d6fSPaolo Abeni u64 recovery_snd_nxt; /* in recovery mode accept up to this seq; 2571e1d9d6fSPaolo Abeni * recovery related fields are under data_lock 2581e1d9d6fSPaolo Abeni * protection 2591e1d9d6fSPaolo Abeni */ 2607439d687SPaolo Abeni u64 snd_una; 2617439d687SPaolo Abeni u64 wnd_end; 262b51f9b80SPaolo Abeni unsigned long timer_ival; 26379c0949eSPeter Krystad u32 token; 26487952603SPaolo Abeni int rmem_released; 265648ef4b8SMat Martineau unsigned long flags; 266e9d09bacSPaolo Abeni unsigned long cb_flags; 267e9d09bacSPaolo Abeni unsigned long push_pending; 2681e1d9d6fSPaolo Abeni bool recovery; /* closing subflow write queue reinjected */ 269d22f4988SChristoph Paasch bool can_ack; 270b93df08cSPaolo Abeni bool fully_established; 2713721b9b6SMat Martineau bool rcv_data_fin; 2727279da61SMat Martineau bool snd_data_fin_enable; 27350c504a2SFlorian Westphal bool rcv_fastclose; 27437198e93SDavide Caratti bool use_64bit_ack; /* Set when we received a 64-bit DSN */ 275752e9067SGeliang Tang bool csum_enabled; 2760530020aSGeliang Tang bool allow_infinite_fallback; 2774f6e14bdSMaxim Galaganov u8 recvmsg_inq:1, 2784f6e14bdSMaxim Galaganov cork:1, 2794f6e14bdSMaxim Galaganov nodelay:1; 28080992017SPaolo Abeni struct work_struct work; 281ab174ad8SPaolo Abeni struct sk_buff *ooo_last_skb; 282ab174ad8SPaolo Abeni struct rb_root out_of_order_queue; 28387952603SPaolo Abeni struct sk_buff_head receive_queue; 284cec37a6eSPeter Krystad struct list_head conn_list; 28518b683bfSPaolo Abeni struct list_head rtx_queue; 286f0e6a4cfSPaolo Abeni struct mptcp_data_frag *first_pending; 287ec3edaa7SPeter Krystad struct list_head join_list; 288f870fa0bSMat Martineau struct socket *subflow; /* outgoing connect/listener/!mp_capable */ 2898ab183deSPaolo Abeni struct sock *first; 2901b1c7a0eSPeter Krystad struct mptcp_pm_data pm; 291a6b118feSFlorian Westphal struct { 292a6b118feSFlorian Westphal u32 space; /* bytes copied in last measurement window */ 293a6b118feSFlorian Westphal u32 copied; /* bytes copied in this measurement window */ 294a6b118feSFlorian Westphal u64 time; /* start time of measurement window */ 295a6b118feSFlorian Westphal u64 rtt_us; /* last maximum rtt of subflows */ 296a6b118feSFlorian Westphal } rcvq_space; 297df00b087SFlorian Westphal 298df00b087SFlorian Westphal u32 setsockopt_seq; 29920b5759fSPaolo Abeni char ca_name[TCP_CA_NAME_MAX]; 300f870fa0bSMat Martineau }; 301f870fa0bSMat Martineau 30287952603SPaolo Abeni #define mptcp_data_lock(sk) spin_lock_bh(&(sk)->sk_lock.slock) 30387952603SPaolo Abeni #define mptcp_data_unlock(sk) spin_unlock_bh(&(sk)->sk_lock.slock) 30487952603SPaolo Abeni 305cec37a6eSPeter Krystad #define mptcp_for_each_subflow(__msk, __subflow) \ 306cec37a6eSPeter Krystad list_for_each_entry(__subflow, &((__msk)->conn_list), node) 307cec37a6eSPeter Krystad 3083abc05d9SFlorian Westphal static inline void msk_owned_by_me(const struct mptcp_sock *msk) 3093abc05d9SFlorian Westphal { 3103abc05d9SFlorian Westphal sock_owned_by_me((const struct sock *)msk); 3113abc05d9SFlorian Westphal } 3123abc05d9SFlorian Westphal 313f870fa0bSMat Martineau static inline struct mptcp_sock *mptcp_sk(const struct sock *sk) 314f870fa0bSMat Martineau { 315f870fa0bSMat Martineau return (struct mptcp_sock *)sk; 316f870fa0bSMat Martineau } 317f870fa0bSMat Martineau 318ce599c51SPaolo Abeni /* the msk socket don't use the backlog, also account for the bulk 319ce599c51SPaolo Abeni * free memory 320ce599c51SPaolo Abeni */ 321ce599c51SPaolo Abeni static inline int __mptcp_rmem(const struct sock *sk) 322ce599c51SPaolo Abeni { 323ce599c51SPaolo Abeni return atomic_read(&sk->sk_rmem_alloc) - READ_ONCE(mptcp_sk(sk)->rmem_released); 324ce599c51SPaolo Abeni } 325ce599c51SPaolo Abeni 326ea4ca586SPaolo Abeni static inline int __mptcp_space(const struct sock *sk) 327ea4ca586SPaolo Abeni { 328ce599c51SPaolo Abeni return tcp_win_from_space(sk, READ_ONCE(sk->sk_rcvbuf) - __mptcp_rmem(sk)); 329ea4ca586SPaolo Abeni } 330ea4ca586SPaolo Abeni 331f0e6a4cfSPaolo Abeni static inline struct mptcp_data_frag *mptcp_send_head(const struct sock *sk) 332f0e6a4cfSPaolo Abeni { 333f0e6a4cfSPaolo Abeni const struct mptcp_sock *msk = mptcp_sk(sk); 334f0e6a4cfSPaolo Abeni 335f0e6a4cfSPaolo Abeni return READ_ONCE(msk->first_pending); 336f0e6a4cfSPaolo Abeni } 337f0e6a4cfSPaolo Abeni 338f0e6a4cfSPaolo Abeni static inline struct mptcp_data_frag *mptcp_send_next(struct sock *sk) 339f0e6a4cfSPaolo Abeni { 340f0e6a4cfSPaolo Abeni struct mptcp_sock *msk = mptcp_sk(sk); 341f0e6a4cfSPaolo Abeni struct mptcp_data_frag *cur; 342f0e6a4cfSPaolo Abeni 343f0e6a4cfSPaolo Abeni cur = msk->first_pending; 344f0e6a4cfSPaolo Abeni return list_is_last(&cur->list, &msk->rtx_queue) ? NULL : 345f0e6a4cfSPaolo Abeni list_next_entry(cur, list); 346f0e6a4cfSPaolo Abeni } 347f0e6a4cfSPaolo Abeni 348f0e6a4cfSPaolo Abeni static inline struct mptcp_data_frag *mptcp_pending_tail(const struct sock *sk) 349f0e6a4cfSPaolo Abeni { 350f0e6a4cfSPaolo Abeni struct mptcp_sock *msk = mptcp_sk(sk); 351f0e6a4cfSPaolo Abeni 352f0e6a4cfSPaolo Abeni if (!msk->first_pending) 353f0e6a4cfSPaolo Abeni return NULL; 354f0e6a4cfSPaolo Abeni 355f0e6a4cfSPaolo Abeni if (WARN_ON_ONCE(list_empty(&msk->rtx_queue))) 356f0e6a4cfSPaolo Abeni return NULL; 357f0e6a4cfSPaolo Abeni 358f0e6a4cfSPaolo Abeni return list_last_entry(&msk->rtx_queue, struct mptcp_data_frag, list); 359f0e6a4cfSPaolo Abeni } 360f0e6a4cfSPaolo Abeni 3617948f6ccSFlorian Westphal static inline struct mptcp_data_frag *mptcp_rtx_head(const struct sock *sk) 3627948f6ccSFlorian Westphal { 3637948f6ccSFlorian Westphal struct mptcp_sock *msk = mptcp_sk(sk); 3647948f6ccSFlorian Westphal 36564b9cea7SPaolo Abeni if (msk->snd_una == READ_ONCE(msk->snd_nxt)) 36664b9cea7SPaolo Abeni return NULL; 36764b9cea7SPaolo Abeni 368a386bc5bSGeliang Tang return list_first_entry_or_null(&msk->rtx_queue, struct mptcp_data_frag, list); 3697948f6ccSFlorian Westphal } 3707948f6ccSFlorian Westphal 371d0cc2987SGeliang Tang struct csum_pseudo_header { 372d0cc2987SGeliang Tang __be64 data_seq; 373d0cc2987SGeliang Tang __be32 subflow_seq; 374d0cc2987SGeliang Tang __be16 data_len; 375d0cc2987SGeliang Tang __sum16 csum; 376d0cc2987SGeliang Tang }; 377d0cc2987SGeliang Tang 378cec37a6eSPeter Krystad struct mptcp_subflow_request_sock { 379cec37a6eSPeter Krystad struct tcp_request_sock sk; 380d22f4988SChristoph Paasch u16 mp_capable : 1, 381cec37a6eSPeter Krystad mp_join : 1, 38206fe1719SGeliang Tang backup : 1, 383bab6b88eSGeliang Tang csum_reqd : 1, 384bab6b88eSGeliang Tang allow_join_id0 : 1; 3851b1c7a0eSPeter Krystad u8 local_id; 386f296234cSPeter Krystad u8 remote_id; 387cec37a6eSPeter Krystad u64 local_key; 38879c0949eSPeter Krystad u64 idsn; 38979c0949eSPeter Krystad u32 token; 390648ef4b8SMat Martineau u32 ssn_offset; 391f296234cSPeter Krystad u64 thmac; 392f296234cSPeter Krystad u32 local_nonce; 393f296234cSPeter Krystad u32 remote_nonce; 3948fd4de12SPaolo Abeni struct mptcp_sock *msk; 3952c5ebd00SPaolo Abeni struct hlist_nulls_node token_node; 396cec37a6eSPeter Krystad }; 397cec37a6eSPeter Krystad 398cec37a6eSPeter Krystad static inline struct mptcp_subflow_request_sock * 399cec37a6eSPeter Krystad mptcp_subflow_rsk(const struct request_sock *rsk) 400cec37a6eSPeter Krystad { 401cec37a6eSPeter Krystad return (struct mptcp_subflow_request_sock *)rsk; 402cec37a6eSPeter Krystad } 403cec37a6eSPeter Krystad 4046719331cSPaolo Abeni enum mptcp_data_avail { 4056719331cSPaolo Abeni MPTCP_SUBFLOW_NODATA, 4066719331cSPaolo Abeni MPTCP_SUBFLOW_DATA_AVAIL, 4076719331cSPaolo Abeni }; 4086719331cSPaolo Abeni 409b19bc294SPaolo Abeni struct mptcp_delegated_action { 410b19bc294SPaolo Abeni struct napi_struct napi; 411b19bc294SPaolo Abeni struct list_head head; 412b19bc294SPaolo Abeni }; 413b19bc294SPaolo Abeni 414b19bc294SPaolo Abeni DECLARE_PER_CPU(struct mptcp_delegated_action, mptcp_delegated_actions); 415b19bc294SPaolo Abeni 416b19bc294SPaolo Abeni #define MPTCP_DELEGATE_SEND 0 417bcd97734SPaolo Abeni #define MPTCP_DELEGATE_ACK 1 418b19bc294SPaolo Abeni 4192303f994SPeter Krystad /* MPTCP subflow context */ 4202303f994SPeter Krystad struct mptcp_subflow_context { 421cec37a6eSPeter Krystad struct list_head node;/* conn_list of subflows */ 422b29fcfb5SPaolo Abeni 42363ec72bdSKees Cook struct_group(reset, 424b29fcfb5SPaolo Abeni 4253ce0852cSPaolo Abeni unsigned long avg_pacing_rate; /* protected by msk socket lock */ 426cec37a6eSPeter Krystad u64 local_key; 427cec37a6eSPeter Krystad u64 remote_key; 42879c0949eSPeter Krystad u64 idsn; 429648ef4b8SMat Martineau u64 map_seq; 430cc7972eaSChristoph Paasch u32 snd_isn; 43179c0949eSPeter Krystad u32 token; 4326d0060f6SMat Martineau u32 rel_write_seq; 433648ef4b8SMat Martineau u32 map_subflow_seq; 434648ef4b8SMat Martineau u32 ssn_offset; 435648ef4b8SMat Martineau u32 map_data_len; 436dd8bcd17SPaolo Abeni __wsum map_data_csum; 437dd8bcd17SPaolo Abeni u32 map_csum_len; 438cec37a6eSPeter Krystad u32 request_mptcp : 1, /* send MP_CAPABLE */ 439ec3edaa7SPeter Krystad request_join : 1, /* send MP_JOIN */ 440ec3edaa7SPeter Krystad request_bkup : 1, 441cec37a6eSPeter Krystad mp_capable : 1, /* remote is MPTCP capable */ 442f296234cSPeter Krystad mp_join : 1, /* remote is JOINing */ 4430be534f5SPaolo Abeni fully_established : 1, /* path validated */ 444f296234cSPeter Krystad pm_notified : 1, /* PM hook called for established status */ 445648ef4b8SMat Martineau conn_finished : 1, 446648ef4b8SMat Martineau map_valid : 1, 447dd8bcd17SPaolo Abeni map_csum_reqd : 1, 448dd8bcd17SPaolo Abeni map_data_fin : 1, 449d22f4988SChristoph Paasch mpc_map : 1, 450f296234cSPeter Krystad backup : 1, 45106706542SGeliang Tang send_mp_prio : 1, 452c25aeb4eSGeliang Tang send_mp_fail : 1, 453f284c0c7SPaolo Abeni send_fastclose : 1, 4541e39e5a3SGeliang Tang send_infinite_map : 1, 455d22f4988SChristoph Paasch rx_eof : 1, 456e16163b6SPaolo Abeni can_ack : 1, /* only after processing the remote a key */ 457ff5a0b42SPaolo Abeni disposable : 1, /* ctx can be free at ulp release time */ 4584cf86ae8SPaolo Abeni stale : 1, /* unable to snd/rcv data, do not use for xmit */ 4594cf86ae8SPaolo Abeni local_id_valid : 1; /* local_id is correctly initialized */ 4606719331cSPaolo Abeni enum mptcp_data_avail data_avail; 4619c81be0dSGeliang Tang bool mp_fail_response_expect; 462f296234cSPeter Krystad u32 remote_nonce; 463f296234cSPeter Krystad u64 thmac; 464f296234cSPeter Krystad u32 local_nonce; 465ec3edaa7SPeter Krystad u32 remote_token; 466ec3edaa7SPeter Krystad u8 hmac[MPTCPOPT_HMAC_LEN]; 467f296234cSPeter Krystad u8 local_id; 468f296234cSPeter Krystad u8 remote_id; 469dc87efdbSFlorian Westphal u8 reset_seen:1; 470dc87efdbSFlorian Westphal u8 reset_transient:1; 471dc87efdbSFlorian Westphal u8 reset_reason:4; 47271b7dec2SPaolo Abeni u8 stale_count; 473648ef4b8SMat Martineau 474b19bc294SPaolo Abeni long delegated_status; 475b29fcfb5SPaolo Abeni 47663ec72bdSKees Cook ); 477b29fcfb5SPaolo Abeni 478b19bc294SPaolo Abeni struct list_head delegated_node; /* link into delegated_action, protected by local BH */ 479b19bc294SPaolo Abeni 480df00b087SFlorian Westphal u32 setsockopt_seq; 48171b7dec2SPaolo Abeni u32 stale_rcv_tstamp; 482df00b087SFlorian Westphal 4832303f994SPeter Krystad struct sock *tcp_sock; /* tcp sk backpointer */ 4842303f994SPeter Krystad struct sock *conn; /* parent mptcp_sock */ 485cec37a6eSPeter Krystad const struct inet_connection_sock_af_ops *icsk_af_ops; 486648ef4b8SMat Martineau void (*tcp_state_change)(struct sock *sk); 48715cc1045SPaolo Abeni void (*tcp_error_report)(struct sock *sk); 488648ef4b8SMat Martineau 4892303f994SPeter Krystad struct rcu_head rcu; 4902303f994SPeter Krystad }; 4912303f994SPeter Krystad 4922303f994SPeter Krystad static inline struct mptcp_subflow_context * 4932303f994SPeter Krystad mptcp_subflow_ctx(const struct sock *sk) 4942303f994SPeter Krystad { 4952303f994SPeter Krystad struct inet_connection_sock *icsk = inet_csk(sk); 4962303f994SPeter Krystad 4972303f994SPeter Krystad /* Use RCU on icsk_ulp_data only for sock diag code */ 4982303f994SPeter Krystad return (__force struct mptcp_subflow_context *)icsk->icsk_ulp_data; 4992303f994SPeter Krystad } 5002303f994SPeter Krystad 5012303f994SPeter Krystad static inline struct sock * 5022303f994SPeter Krystad mptcp_subflow_tcp_sock(const struct mptcp_subflow_context *subflow) 5032303f994SPeter Krystad { 5042303f994SPeter Krystad return subflow->tcp_sock; 5052303f994SPeter Krystad } 5062303f994SPeter Krystad 507b29fcfb5SPaolo Abeni static inline void 508b29fcfb5SPaolo Abeni mptcp_subflow_ctx_reset(struct mptcp_subflow_context *subflow) 509b29fcfb5SPaolo Abeni { 51063ec72bdSKees Cook memset(&subflow->reset, 0, sizeof(subflow->reset)); 511b29fcfb5SPaolo Abeni subflow->request_mptcp = 1; 512b29fcfb5SPaolo Abeni } 513b29fcfb5SPaolo Abeni 514648ef4b8SMat Martineau static inline u64 515648ef4b8SMat Martineau mptcp_subflow_get_map_offset(const struct mptcp_subflow_context *subflow) 516648ef4b8SMat Martineau { 517648ef4b8SMat Martineau return tcp_sk(mptcp_subflow_tcp_sock(subflow))->copied_seq - 518648ef4b8SMat Martineau subflow->ssn_offset - 519648ef4b8SMat Martineau subflow->map_subflow_seq; 520648ef4b8SMat Martineau } 521648ef4b8SMat Martineau 522648ef4b8SMat Martineau static inline u64 523648ef4b8SMat Martineau mptcp_subflow_get_mapped_dsn(const struct mptcp_subflow_context *subflow) 524648ef4b8SMat Martineau { 525648ef4b8SMat Martineau return subflow->map_seq + mptcp_subflow_get_map_offset(subflow); 526648ef4b8SMat Martineau } 527648ef4b8SMat Martineau 528b19bc294SPaolo Abeni void mptcp_subflow_process_delegated(struct sock *ssk); 529b19bc294SPaolo Abeni 530bcd97734SPaolo Abeni static inline void mptcp_subflow_delegate(struct mptcp_subflow_context *subflow, int action) 531b19bc294SPaolo Abeni { 532b19bc294SPaolo Abeni struct mptcp_delegated_action *delegated; 533b19bc294SPaolo Abeni bool schedule; 534b19bc294SPaolo Abeni 535bcd97734SPaolo Abeni /* the caller held the subflow bh socket lock */ 536bcd97734SPaolo Abeni lockdep_assert_in_softirq(); 537bcd97734SPaolo Abeni 538b19bc294SPaolo Abeni /* The implied barrier pairs with mptcp_subflow_delegated_done(), and 539b19bc294SPaolo Abeni * ensures the below list check sees list updates done prior to status 540b19bc294SPaolo Abeni * bit changes 541b19bc294SPaolo Abeni */ 542bcd97734SPaolo Abeni if (!test_and_set_bit(action, &subflow->delegated_status)) { 543b19bc294SPaolo Abeni /* still on delegated list from previous scheduling */ 544b19bc294SPaolo Abeni if (!list_empty(&subflow->delegated_node)) 545b19bc294SPaolo Abeni return; 546b19bc294SPaolo Abeni 547b19bc294SPaolo Abeni delegated = this_cpu_ptr(&mptcp_delegated_actions); 548b19bc294SPaolo Abeni schedule = list_empty(&delegated->head); 549b19bc294SPaolo Abeni list_add_tail(&subflow->delegated_node, &delegated->head); 550b19bc294SPaolo Abeni sock_hold(mptcp_subflow_tcp_sock(subflow)); 551b19bc294SPaolo Abeni if (schedule) 552b19bc294SPaolo Abeni napi_schedule(&delegated->napi); 553b19bc294SPaolo Abeni } 554b19bc294SPaolo Abeni } 555b19bc294SPaolo Abeni 556b19bc294SPaolo Abeni static inline struct mptcp_subflow_context * 557b19bc294SPaolo Abeni mptcp_subflow_delegated_next(struct mptcp_delegated_action *delegated) 558b19bc294SPaolo Abeni { 559b19bc294SPaolo Abeni struct mptcp_subflow_context *ret; 560b19bc294SPaolo Abeni 561b19bc294SPaolo Abeni if (list_empty(&delegated->head)) 562b19bc294SPaolo Abeni return NULL; 563b19bc294SPaolo Abeni 564b19bc294SPaolo Abeni ret = list_first_entry(&delegated->head, struct mptcp_subflow_context, delegated_node); 565b19bc294SPaolo Abeni list_del_init(&ret->delegated_node); 566b19bc294SPaolo Abeni return ret; 567b19bc294SPaolo Abeni } 568b19bc294SPaolo Abeni 569b19bc294SPaolo Abeni static inline bool mptcp_subflow_has_delegated_action(const struct mptcp_subflow_context *subflow) 570b19bc294SPaolo Abeni { 571bcd97734SPaolo Abeni return !!READ_ONCE(subflow->delegated_status); 572b19bc294SPaolo Abeni } 573b19bc294SPaolo Abeni 574bcd97734SPaolo Abeni static inline void mptcp_subflow_delegated_done(struct mptcp_subflow_context *subflow, int action) 575b19bc294SPaolo Abeni { 576b19bc294SPaolo Abeni /* pairs with mptcp_subflow_delegate, ensures delegate_node is updated before 577b19bc294SPaolo Abeni * touching the status bit 578b19bc294SPaolo Abeni */ 579b19bc294SPaolo Abeni smp_wmb(); 580bcd97734SPaolo Abeni clear_bit(action, &subflow->delegated_status); 581b19bc294SPaolo Abeni } 582b19bc294SPaolo Abeni 5836da14d74SPaolo Abeni int mptcp_is_enabled(const struct net *net); 5846da14d74SPaolo Abeni unsigned int mptcp_get_add_addr_timeout(const struct net *net); 5856da14d74SPaolo Abeni int mptcp_is_checksum_enabled(const struct net *net); 5866da14d74SPaolo Abeni int mptcp_allow_join_id0(const struct net *net); 587ff5a0b42SPaolo Abeni unsigned int mptcp_stale_loss_cnt(const struct net *net); 588b93df08cSPaolo Abeni void mptcp_subflow_fully_established(struct mptcp_subflow_context *subflow, 589b93df08cSPaolo Abeni struct mptcp_options_received *mp_opt); 5901e1d9d6fSPaolo Abeni bool __mptcp_retransmit_pending_data(struct sock *sk); 5918b38217aSMaxim Galaganov void mptcp_check_and_set_pending(struct sock *sk); 592ff5a0b42SPaolo Abeni void __mptcp_push_pending(struct sock *sk, unsigned int flags); 593648ef4b8SMat Martineau bool mptcp_subflow_data_available(struct sock *sk); 594d39dcecaSPaolo Abeni void __init mptcp_subflow_init(void); 595d0876b22SGeliang Tang void mptcp_subflow_shutdown(struct sock *sk, struct sock *ssk, int how); 596a141e02eSFlorian Westphal void mptcp_close_ssk(struct sock *sk, struct sock *ssk, 597e16163b6SPaolo Abeni struct mptcp_subflow_context *subflow); 598340fa666SMat Martineau void mptcp_subflow_send_ack(struct sock *ssk); 599d5824847SPaolo Abeni void mptcp_subflow_reset(struct sock *ssk); 600866f26f2SPaolo Abeni void mptcp_sock_graft(struct sock *sk, struct socket *parent); 6011729cf18SGeliang Tang struct socket *__mptcp_nmpc_socket(const struct mptcp_sock *msk); 602ec3edaa7SPeter Krystad 603ec3edaa7SPeter Krystad /* called with sk socket lock held */ 604ef0da3b8SPaolo Abeni int __mptcp_subflow_connect(struct sock *sk, const struct mptcp_addr_info *loc, 605ee285257SGeliang Tang const struct mptcp_addr_info *remote); 6062303f994SPeter Krystad int mptcp_subflow_create_socket(struct sock *sk, struct socket **new_sock); 6071729cf18SGeliang Tang void mptcp_info2sockaddr(const struct mptcp_addr_info *info, 6081729cf18SGeliang Tang struct sockaddr_storage *addr, 6091729cf18SGeliang Tang unsigned short family); 6102303f994SPeter Krystad 611ff5a0b42SPaolo Abeni static inline bool __mptcp_subflow_active(struct mptcp_subflow_context *subflow) 61243f1140bSGeliang Tang { 61343f1140bSGeliang Tang struct sock *ssk = mptcp_subflow_tcp_sock(subflow); 61443f1140bSGeliang Tang 61543f1140bSGeliang Tang /* can't send if JOIN hasn't completed yet (i.e. is usable for mptcp) */ 61643f1140bSGeliang Tang if (subflow->request_join && !subflow->fully_established) 61743f1140bSGeliang Tang return false; 61843f1140bSGeliang Tang 61943f1140bSGeliang Tang /* only send if our side has not closed yet */ 62043f1140bSGeliang Tang return ((1 << ssk->sk_state) & (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT)); 62143f1140bSGeliang Tang } 62243f1140bSGeliang Tang 623ff5a0b42SPaolo Abeni void mptcp_subflow_set_active(struct mptcp_subflow_context *subflow); 624ff5a0b42SPaolo Abeni 625ff5a0b42SPaolo Abeni bool mptcp_subflow_active(struct mptcp_subflow_context *subflow); 626ff5a0b42SPaolo Abeni 627648ef4b8SMat Martineau static inline void mptcp_subflow_tcp_fallback(struct sock *sk, 628648ef4b8SMat Martineau struct mptcp_subflow_context *ctx) 629648ef4b8SMat Martineau { 630952382c6SFlorian Westphal sk->sk_data_ready = sock_def_readable; 631648ef4b8SMat Martineau sk->sk_state_change = ctx->tcp_state_change; 632952382c6SFlorian Westphal sk->sk_write_space = sk_stream_write_space; 63315cc1045SPaolo Abeni sk->sk_error_report = ctx->tcp_error_report; 634648ef4b8SMat Martineau 635648ef4b8SMat Martineau inet_csk(sk)->icsk_af_ops = ctx->icsk_af_ops; 636648ef4b8SMat Martineau } 637648ef4b8SMat Martineau 638478d7700SGeliang Tang static inline bool mptcp_has_another_subflow(struct sock *ssk) 639478d7700SGeliang Tang { 640478d7700SGeliang Tang struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk), *tmp; 641478d7700SGeliang Tang struct mptcp_sock *msk = mptcp_sk(subflow->conn); 642478d7700SGeliang Tang 643478d7700SGeliang Tang mptcp_for_each_subflow(msk, tmp) { 644478d7700SGeliang Tang if (tmp != subflow) 645478d7700SGeliang Tang return true; 646478d7700SGeliang Tang } 647478d7700SGeliang Tang 648478d7700SGeliang Tang return false; 649478d7700SGeliang Tang } 650478d7700SGeliang Tang 651d39dcecaSPaolo Abeni void __init mptcp_proto_init(void); 652784325e9SMatthieu Baerts #if IS_ENABLED(CONFIG_MPTCP_IPV6) 653d39dcecaSPaolo Abeni int __init mptcp_proto_v6_init(void); 654784325e9SMatthieu Baerts #endif 655648ef4b8SMat Martineau 656fca5c82cSPaolo Abeni struct sock *mptcp_sk_clone(const struct sock *sk, 657cfde141eSPaolo Abeni const struct mptcp_options_received *mp_opt, 658fca5c82cSPaolo Abeni struct request_sock *req); 6590799e21bSGeliang Tang void mptcp_get_options(const struct sk_buff *skb, 660cfde141eSPaolo Abeni struct mptcp_options_received *mp_opt); 661cec37a6eSPeter Krystad 662cec37a6eSPeter Krystad void mptcp_finish_connect(struct sock *sk); 663490274b4SPaolo Abeni void __mptcp_set_connected(struct sock *sk); 664b93df08cSPaolo Abeni static inline bool mptcp_is_fully_established(struct sock *sk) 665b93df08cSPaolo Abeni { 666b93df08cSPaolo Abeni return inet_sk_state_load(sk) == TCP_ESTABLISHED && 667b93df08cSPaolo Abeni READ_ONCE(mptcp_sk(sk)->fully_established); 668b93df08cSPaolo Abeni } 669a6b118feSFlorian Westphal void mptcp_rcv_space_init(struct mptcp_sock *msk, const struct sock *ssk); 6702e52213cSFlorian Westphal void mptcp_data_ready(struct sock *sk, struct sock *ssk); 671f296234cSPeter Krystad bool mptcp_finish_join(struct sock *sk); 672ba8f48f7SPaolo Abeni bool mptcp_schedule_work(struct sock *sk); 6730abdde82SPaolo Abeni int mptcp_setsockopt(struct sock *sk, int level, int optname, 6740abdde82SPaolo Abeni sockptr_t optval, unsigned int optlen); 6750abdde82SPaolo Abeni int mptcp_getsockopt(struct sock *sk, int level, int optname, 6760abdde82SPaolo Abeni char __user *optval, int __user *option); 6770abdde82SPaolo Abeni 6781502328fSPaolo Abeni u64 __mptcp_expand_seq(u64 old_seq, u64 cur_seq); 6791502328fSPaolo Abeni static inline u64 mptcp_expand_seq(u64 old_seq, u64 cur_seq, bool use_64bit) 6801502328fSPaolo Abeni { 6811502328fSPaolo Abeni if (use_64bit) 6821502328fSPaolo Abeni return cur_seq; 6831502328fSPaolo Abeni 6841502328fSPaolo Abeni return __mptcp_expand_seq(old_seq, cur_seq); 6851502328fSPaolo Abeni } 686219d0499SPaolo Abeni void __mptcp_check_push(struct sock *sk, struct sock *ssk); 6877439d687SPaolo Abeni void __mptcp_data_acked(struct sock *sk); 68815cc1045SPaolo Abeni void __mptcp_error_report(struct sock *sk); 68959832e24SFlorian Westphal void mptcp_subflow_eof(struct sock *sk); 6901a49b2c2SMat Martineau bool mptcp_update_rcv_data_fin(struct mptcp_sock *msk, u64 data_fin_seq, bool use_64bit); 691e16163b6SPaolo Abeni static inline bool mptcp_data_fin_enabled(const struct mptcp_sock *msk) 692e16163b6SPaolo Abeni { 693e16163b6SPaolo Abeni return READ_ONCE(msk->snd_data_fin_enable) && 694e16163b6SPaolo Abeni READ_ONCE(msk->write_seq) == READ_ONCE(msk->snd_nxt); 695e16163b6SPaolo Abeni } 696e16163b6SPaolo Abeni 6975cf92bbaSPaolo Abeni static inline bool mptcp_propagate_sndbuf(struct sock *sk, struct sock *ssk) 6985cf92bbaSPaolo Abeni { 6995cf92bbaSPaolo Abeni if ((sk->sk_userlocks & SOCK_SNDBUF_LOCK) || ssk->sk_sndbuf <= READ_ONCE(sk->sk_sndbuf)) 7005cf92bbaSPaolo Abeni return false; 7015cf92bbaSPaolo Abeni 7025cf92bbaSPaolo Abeni WRITE_ONCE(sk->sk_sndbuf, ssk->sk_sndbuf); 7035cf92bbaSPaolo Abeni return true; 7045cf92bbaSPaolo Abeni } 7055cf92bbaSPaolo Abeni 7065cf92bbaSPaolo Abeni static inline void mptcp_write_space(struct sock *sk) 7075cf92bbaSPaolo Abeni { 7085cf92bbaSPaolo Abeni if (sk_stream_is_writeable(sk)) { 7095cf92bbaSPaolo Abeni /* pairs with memory barrier in mptcp_poll */ 7105cf92bbaSPaolo Abeni smp_mb(); 7115cf92bbaSPaolo Abeni if (test_and_clear_bit(MPTCP_NOSPACE, &mptcp_sk(sk)->flags)) 7125cf92bbaSPaolo Abeni sk_stream_write_space(sk); 7135cf92bbaSPaolo Abeni } 7145cf92bbaSPaolo Abeni } 7155cf92bbaSPaolo Abeni 7165c8c1640SGeliang Tang void mptcp_destroy_common(struct mptcp_sock *msk); 717cec37a6eSPeter Krystad 718c68a0cd1SJianguo Wu #define MPTCP_TOKEN_MAX_RETRIES 4 719c68a0cd1SJianguo Wu 7202c5ebd00SPaolo Abeni void __init mptcp_token_init(void); 7212c5ebd00SPaolo Abeni static inline void mptcp_token_init_request(struct request_sock *req) 7222c5ebd00SPaolo Abeni { 7232c5ebd00SPaolo Abeni mptcp_subflow_rsk(req)->token_node.pprev = NULL; 7242c5ebd00SPaolo Abeni } 7252c5ebd00SPaolo Abeni 72679c0949eSPeter Krystad int mptcp_token_new_request(struct request_sock *req); 7272c5ebd00SPaolo Abeni void mptcp_token_destroy_request(struct request_sock *req); 72879c0949eSPeter Krystad int mptcp_token_new_connect(struct sock *sk); 7292c5ebd00SPaolo Abeni void mptcp_token_accept(struct mptcp_subflow_request_sock *r, 7302c5ebd00SPaolo Abeni struct mptcp_sock *msk); 731c83a47e5SFlorian Westphal bool mptcp_token_exists(u32 token); 732ea1300b9SFlorian Westphal struct mptcp_sock *mptcp_token_get_sock(struct net *net, u32 token); 73396d890daSPaolo Abeni struct mptcp_sock *mptcp_token_iter_next(const struct net *net, long *s_slot, 73496d890daSPaolo Abeni long *s_num); 7352c5ebd00SPaolo Abeni void mptcp_token_destroy(struct mptcp_sock *msk); 73679c0949eSPeter Krystad 73779c0949eSPeter Krystad void mptcp_crypto_key_sha(u64 key, u32 *token, u64 *idsn); 73879c0949eSPeter Krystad 7393df523abSPeter Krystad void mptcp_crypto_hmac_sha(u64 key1, u64 key2, u8 *msg, int len, void *hmac); 740c312ee21SGeliang Tang u16 __mptcp_make_csum(u64 data_seq, u32 subflow_seq, u16 data_len, __wsum sum); 74179c0949eSPeter Krystad 742d39dcecaSPaolo Abeni void __init mptcp_pm_init(void); 7431b1c7a0eSPeter Krystad void mptcp_pm_data_init(struct mptcp_sock *msk); 744b29fcfb5SPaolo Abeni void mptcp_pm_data_reset(struct mptcp_sock *msk); 74571b7dec2SPaolo Abeni void mptcp_pm_subflow_chk_stale(const struct mptcp_sock *msk, struct sock *ssk); 746ff5a0b42SPaolo Abeni void mptcp_pm_nl_subflow_chk_stale(const struct mptcp_sock *msk, struct sock *ssk); 7476c714f1bSFlorian Westphal void mptcp_pm_new_connection(struct mptcp_sock *msk, const struct sock *ssk, int server_side); 7486c714f1bSFlorian Westphal void mptcp_pm_fully_established(struct mptcp_sock *msk, const struct sock *ssk, gfp_t gfp); 7491b1c7a0eSPeter Krystad bool mptcp_pm_allow_new_subflow(struct mptcp_sock *msk); 7501b1c7a0eSPeter Krystad void mptcp_pm_connection_closed(struct mptcp_sock *msk); 75162535200SGeliang Tang void mptcp_pm_subflow_established(struct mptcp_sock *msk); 752a88c9e49SPaolo Abeni bool mptcp_pm_nl_check_work_pending(struct mptcp_sock *msk); 753a88c9e49SPaolo Abeni void mptcp_pm_subflow_check_next(struct mptcp_sock *msk, const struct sock *ssk, 754a88c9e49SPaolo Abeni const struct mptcp_subflow_context *subflow); 7551b1c7a0eSPeter Krystad void mptcp_pm_add_addr_received(struct mptcp_sock *msk, 7561b1c7a0eSPeter Krystad const struct mptcp_addr_info *addr); 757557963c3SGeliang Tang void mptcp_pm_add_addr_echoed(struct mptcp_sock *msk, 75890d93088SPaolo Abeni const struct mptcp_addr_info *addr); 75984dfe367SGeliang Tang void mptcp_pm_add_addr_send_ack(struct mptcp_sock *msk); 760b46a0238SGeliang Tang void mptcp_pm_nl_addr_send_ack(struct mptcp_sock *msk); 7615c4a824dSGeliang Tang void mptcp_pm_rm_addr_received(struct mptcp_sock *msk, 7625c4a824dSGeliang Tang const struct mptcp_rm_list *rm_list); 76340453a5cSGeliang Tang void mptcp_pm_mp_prio_received(struct sock *sk, u8 bkup); 7645580d41bSGeliang Tang void mptcp_pm_mp_fail_received(struct sock *sk, u64 fail_seq); 765b6c08380SGeliang Tang void mptcp_pm_free_anno_list(struct mptcp_sock *msk); 7665bc56388SGeliang Tang bool mptcp_pm_sport_in_anno_list(struct mptcp_sock *msk, const struct sock *sk); 76700cfd77bSGeliang Tang struct mptcp_pm_add_entry * 76800cfd77bSGeliang Tang mptcp_pm_del_add_timer(struct mptcp_sock *msk, 76990d93088SPaolo Abeni const struct mptcp_addr_info *addr, bool check_id); 770d88c476fSGeliang Tang struct mptcp_pm_add_entry * 77190d93088SPaolo Abeni mptcp_lookup_anno_list_by_saddr(const struct mptcp_sock *msk, 77290d93088SPaolo Abeni const struct mptcp_addr_info *addr); 773ee285257SGeliang Tang int mptcp_pm_get_flags_and_ifindex_by_id(struct net *net, unsigned int id, 774ee285257SGeliang Tang u8 *flags, int *ifindex); 7751b1c7a0eSPeter Krystad 7761b1c7a0eSPeter Krystad int mptcp_pm_announce_addr(struct mptcp_sock *msk, 7776a6c05a8SGeliang Tang const struct mptcp_addr_info *addr, 778f7efc777SGeliang Tang bool echo); 779cbde2787SGeliang Tang int mptcp_pm_remove_addr(struct mptcp_sock *msk, const struct mptcp_rm_list *rm_list); 780ddd14bb8SGeliang Tang int mptcp_pm_remove_subflow(struct mptcp_sock *msk, const struct mptcp_rm_list *rm_list); 7811b1c7a0eSPeter Krystad 782b911c97cSFlorian Westphal void mptcp_event(enum mptcp_event_type type, const struct mptcp_sock *msk, 783b911c97cSFlorian Westphal const struct sock *ssk, gfp_t gfp); 784b911c97cSFlorian Westphal void mptcp_event_addr_announced(const struct mptcp_sock *msk, const struct mptcp_addr_info *info); 785b911c97cSFlorian Westphal void mptcp_event_addr_removed(const struct mptcp_sock *msk, u8 id); 786b911c97cSFlorian Westphal 787f643b803SGeliang Tang static inline bool mptcp_pm_should_add_signal(struct mptcp_sock *msk) 7881b1c7a0eSPeter Krystad { 78918fc1a92SYonglong Li return READ_ONCE(msk->pm.addr_signal) & 79018fc1a92SYonglong Li (BIT(MPTCP_ADD_ADDR_SIGNAL) | BIT(MPTCP_ADD_ADDR_ECHO)); 79118fc1a92SYonglong Li } 79218fc1a92SYonglong Li 79318fc1a92SYonglong Li static inline bool mptcp_pm_should_add_signal_addr(struct mptcp_sock *msk) 79418fc1a92SYonglong Li { 79513ad9f01SGeliang Tang return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_SIGNAL); 796d91d322aSGeliang Tang } 797d91d322aSGeliang Tang 798d91d322aSGeliang Tang static inline bool mptcp_pm_should_add_signal_echo(struct mptcp_sock *msk) 799d91d322aSGeliang Tang { 80013ad9f01SGeliang Tang return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_ECHO); 8011b1c7a0eSPeter Krystad } 8021b1c7a0eSPeter Krystad 8035cb104aeSGeliang Tang static inline bool mptcp_pm_should_rm_signal(struct mptcp_sock *msk) 8045cb104aeSGeliang Tang { 80513ad9f01SGeliang Tang return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_RM_ADDR_SIGNAL); 8065cb104aeSGeliang Tang } 8075cb104aeSGeliang Tang 8084a2777a8SGeliang Tang static inline unsigned int mptcp_add_addr_len(int family, bool echo, bool port) 8091b1c7a0eSPeter Krystad { 8102ec72faeSGeliang Tang u8 len = TCPOLEN_MPTCP_ADD_ADDR_BASE; 8112ec72faeSGeliang Tang 8122ec72faeSGeliang Tang if (family == AF_INET6) 8132ec72faeSGeliang Tang len = TCPOLEN_MPTCP_ADD_ADDR6_BASE; 8142ec72faeSGeliang Tang if (!echo) 8152ec72faeSGeliang Tang len += MPTCPOPT_THMAC_LEN; 81627ab92d9SDavide Caratti /* account for 2 trailing 'nop' options */ 8174a2777a8SGeliang Tang if (port) 81827ab92d9SDavide Caratti len += TCPOLEN_MPTCP_PORT_LEN + TCPOLEN_MPTCP_PORT_ALIGN; 8192ec72faeSGeliang Tang 8202ec72faeSGeliang Tang return len; 8211b1c7a0eSPeter Krystad } 8221b1c7a0eSPeter Krystad 8236445e17aSGeliang Tang static inline int mptcp_rm_addr_len(const struct mptcp_rm_list *rm_list) 8246445e17aSGeliang Tang { 8256445e17aSGeliang Tang if (rm_list->nr == 0 || rm_list->nr > MPTCP_RM_IDS_MAX) 8266445e17aSGeliang Tang return -EINVAL; 8276445e17aSGeliang Tang 8286445e17aSGeliang Tang return TCPOLEN_MPTCP_RM_ADDR_BASE + roundup(rm_list->nr - 1, 4) + 1; 8296445e17aSGeliang Tang } 8306445e17aSGeliang Tang 83190d93088SPaolo Abeni bool mptcp_pm_add_addr_signal(struct mptcp_sock *msk, const struct sk_buff *skb, 8321f5e9e2fSYonglong Li unsigned int opt_size, unsigned int remaining, 833f462a446SYonglong Li struct mptcp_addr_info *addr, bool *echo, 834af7939f3SGeliang Tang bool *drop_other_suboptions); 8355cb104aeSGeliang Tang bool mptcp_pm_rm_addr_signal(struct mptcp_sock *msk, unsigned int remaining, 8366445e17aSGeliang Tang struct mptcp_rm_list *rm_list); 8371b1c7a0eSPeter Krystad int mptcp_pm_get_local_id(struct mptcp_sock *msk, struct sock_common *skc); 8381b1c7a0eSPeter Krystad 839d39dcecaSPaolo Abeni void __init mptcp_pm_nl_init(void); 840e9801430SFlorian Westphal void mptcp_pm_nl_work(struct mptcp_sock *msk); 841ddd14bb8SGeliang Tang void mptcp_pm_nl_rm_subflow_received(struct mptcp_sock *msk, 842ddd14bb8SGeliang Tang const struct mptcp_rm_list *rm_list); 84301cacb00SPaolo Abeni int mptcp_pm_nl_get_local_id(struct mptcp_sock *msk, struct sock_common *skc); 84490d93088SPaolo Abeni unsigned int mptcp_pm_get_add_addr_signal_max(const struct mptcp_sock *msk); 84590d93088SPaolo Abeni unsigned int mptcp_pm_get_add_addr_accept_max(const struct mptcp_sock *msk); 84690d93088SPaolo Abeni unsigned int mptcp_pm_get_subflows_max(const struct mptcp_sock *msk); 84790d93088SPaolo Abeni unsigned int mptcp_pm_get_local_addr_max(const struct mptcp_sock *msk); 84801cacb00SPaolo Abeni 84978962489SFlorian Westphal void mptcp_sockopt_sync(struct mptcp_sock *msk, struct sock *ssk); 8503e501490SPaolo Abeni void mptcp_sockopt_sync_locked(struct mptcp_sock *msk, struct sock *ssk); 85178962489SFlorian Westphal 852dc87efdbSFlorian Westphal static inline struct mptcp_ext *mptcp_get_ext(const struct sk_buff *skb) 8536d0060f6SMat Martineau { 8546d0060f6SMat Martineau return (struct mptcp_ext *)skb_ext_find(skb, SKB_EXT_MPTCP); 8556d0060f6SMat Martineau } 8566d0060f6SMat Martineau 8575147dfb5SDavide Caratti void mptcp_diag_subflow_init(struct tcp_ulp_ops *ops); 8585147dfb5SDavide Caratti 859d5f49190SPaolo Abeni static inline bool __mptcp_check_fallback(const struct mptcp_sock *msk) 860e1ff9e82SDavide Caratti { 861e1ff9e82SDavide Caratti return test_bit(MPTCP_FALLBACK_DONE, &msk->flags); 862e1ff9e82SDavide Caratti } 863e1ff9e82SDavide Caratti 864d5f49190SPaolo Abeni static inline bool mptcp_check_fallback(const struct sock *sk) 865e1ff9e82SDavide Caratti { 866e1ff9e82SDavide Caratti struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); 867e1ff9e82SDavide Caratti struct mptcp_sock *msk = mptcp_sk(subflow->conn); 868e1ff9e82SDavide Caratti 869e1ff9e82SDavide Caratti return __mptcp_check_fallback(msk); 870e1ff9e82SDavide Caratti } 871e1ff9e82SDavide Caratti 872e1ff9e82SDavide Caratti static inline void __mptcp_do_fallback(struct mptcp_sock *msk) 873e1ff9e82SDavide Caratti { 874e1ff9e82SDavide Caratti if (test_bit(MPTCP_FALLBACK_DONE, &msk->flags)) { 875e1ff9e82SDavide Caratti pr_debug("TCP fallback already done (msk=%p)", msk); 876e1ff9e82SDavide Caratti return; 877e1ff9e82SDavide Caratti } 878e1ff9e82SDavide Caratti set_bit(MPTCP_FALLBACK_DONE, &msk->flags); 879e1ff9e82SDavide Caratti } 880e1ff9e82SDavide Caratti 881e1ff9e82SDavide Caratti static inline void mptcp_do_fallback(struct sock *sk) 882e1ff9e82SDavide Caratti { 883e1ff9e82SDavide Caratti struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); 884e1ff9e82SDavide Caratti struct mptcp_sock *msk = mptcp_sk(subflow->conn); 885e1ff9e82SDavide Caratti 886e1ff9e82SDavide Caratti __mptcp_do_fallback(msk); 887e1ff9e82SDavide Caratti } 888e1ff9e82SDavide Caratti 889e1ff9e82SDavide Caratti #define pr_fallback(a) pr_debug("%s:fallback to TCP (msk=%p)", __func__, a) 890e1ff9e82SDavide Caratti 8911e39e5a3SGeliang Tang static inline bool mptcp_check_infinite_map(struct sk_buff *skb) 8921e39e5a3SGeliang Tang { 8931e39e5a3SGeliang Tang struct mptcp_ext *mpext; 8941e39e5a3SGeliang Tang 8951e39e5a3SGeliang Tang mpext = skb ? mptcp_get_ext(skb) : NULL; 8961e39e5a3SGeliang Tang if (mpext && mpext->infinite_map) 8971e39e5a3SGeliang Tang return true; 8981e39e5a3SGeliang Tang 8991e39e5a3SGeliang Tang return false; 9001e39e5a3SGeliang Tang } 9011e39e5a3SGeliang Tang 9028fd73804SDavide Caratti static inline bool subflow_simultaneous_connect(struct sock *sk) 9038fd73804SDavide Caratti { 9048fd73804SDavide Caratti struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); 9058fd73804SDavide Caratti struct sock *parent = subflow->conn; 9068fd73804SDavide Caratti 9078fd73804SDavide Caratti return sk->sk_state == TCP_ESTABLISHED && 9088fd73804SDavide Caratti !mptcp_sk(parent)->pm.server_side && 9098fd73804SDavide Caratti !subflow->conn_finished; 9108fd73804SDavide Caratti } 9118fd73804SDavide Caratti 9129466a1ccSFlorian Westphal #ifdef CONFIG_SYN_COOKIES 9139466a1ccSFlorian Westphal void subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req, 9149466a1ccSFlorian Westphal struct sk_buff *skb); 9159466a1ccSFlorian Westphal bool mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req, 9169466a1ccSFlorian Westphal struct sk_buff *skb); 9179466a1ccSFlorian Westphal void __init mptcp_join_cookie_init(void); 9189466a1ccSFlorian Westphal #else 9199466a1ccSFlorian Westphal static inline void 9209466a1ccSFlorian Westphal subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req, 9219466a1ccSFlorian Westphal struct sk_buff *skb) {} 9229466a1ccSFlorian Westphal static inline bool 9239466a1ccSFlorian Westphal mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req, 9249466a1ccSFlorian Westphal struct sk_buff *skb) 9259466a1ccSFlorian Westphal { 9269466a1ccSFlorian Westphal return false; 9279466a1ccSFlorian Westphal } 9289466a1ccSFlorian Westphal 9299466a1ccSFlorian Westphal static inline void mptcp_join_cookie_init(void) {} 9309466a1ccSFlorian Westphal #endif 9319466a1ccSFlorian Westphal 932f870fa0bSMat Martineau #endif /* __MPTCP_PROTOCOL_H */ 933