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> 149ab4807cSKishen Maloor #include <net/genetlink.h> 1579c0949eSPeter Krystad 16cc7972eaSChristoph Paasch #define MPTCP_SUPPORTED_VERSION 1 17eda7acddSPeter Krystad 18eda7acddSPeter Krystad /* MPTCP option bits */ 19eda7acddSPeter Krystad #define OPTION_MPTCP_MPC_SYN BIT(0) 20eda7acddSPeter Krystad #define OPTION_MPTCP_MPC_SYNACK BIT(1) 21eda7acddSPeter Krystad #define OPTION_MPTCP_MPC_ACK BIT(2) 22f296234cSPeter Krystad #define OPTION_MPTCP_MPJ_SYN BIT(3) 23f296234cSPeter Krystad #define OPTION_MPTCP_MPJ_SYNACK BIT(4) 24f296234cSPeter Krystad #define OPTION_MPTCP_MPJ_ACK BIT(5) 253df523abSPeter Krystad #define OPTION_MPTCP_ADD_ADDR BIT(6) 26fef6b7ecSGeliang Tang #define OPTION_MPTCP_RM_ADDR BIT(7) 27fef6b7ecSGeliang Tang #define OPTION_MPTCP_FASTCLOSE BIT(8) 28fef6b7ecSGeliang Tang #define OPTION_MPTCP_PRIO BIT(9) 29fef6b7ecSGeliang Tang #define OPTION_MPTCP_RST BIT(10) 301bff1e43SPaolo Abeni #define OPTION_MPTCP_DSS BIT(11) 31c25aeb4eSGeliang Tang #define OPTION_MPTCP_FAIL BIT(12) 32eda7acddSPeter Krystad 3374c7dfbeSPaolo Abeni #define OPTION_MPTCP_CSUMREQD BIT(13) 3474c7dfbeSPaolo Abeni 3574c7dfbeSPaolo Abeni #define OPTIONS_MPTCP_MPC (OPTION_MPTCP_MPC_SYN | OPTION_MPTCP_MPC_SYNACK | \ 3674c7dfbeSPaolo Abeni OPTION_MPTCP_MPC_ACK) 3774c7dfbeSPaolo Abeni #define OPTIONS_MPTCP_MPJ (OPTION_MPTCP_MPJ_SYN | OPTION_MPTCP_MPJ_SYNACK | \ 38780aa120SWan Jiabing OPTION_MPTCP_MPJ_ACK) 3974c7dfbeSPaolo Abeni 40eda7acddSPeter Krystad /* MPTCP option subtypes */ 41eda7acddSPeter Krystad #define MPTCPOPT_MP_CAPABLE 0 42eda7acddSPeter Krystad #define MPTCPOPT_MP_JOIN 1 43eda7acddSPeter Krystad #define MPTCPOPT_DSS 2 44eda7acddSPeter Krystad #define MPTCPOPT_ADD_ADDR 3 45eda7acddSPeter Krystad #define MPTCPOPT_RM_ADDR 4 46eda7acddSPeter Krystad #define MPTCPOPT_MP_PRIO 5 47eda7acddSPeter Krystad #define MPTCPOPT_MP_FAIL 6 48eda7acddSPeter Krystad #define MPTCPOPT_MP_FASTCLOSE 7 49dc87efdbSFlorian Westphal #define MPTCPOPT_RST 8 50eda7acddSPeter Krystad 51eda7acddSPeter Krystad /* MPTCP suboption lengths */ 52cc7972eaSChristoph Paasch #define TCPOLEN_MPTCP_MPC_SYN 4 53eda7acddSPeter Krystad #define TCPOLEN_MPTCP_MPC_SYNACK 12 54eda7acddSPeter Krystad #define TCPOLEN_MPTCP_MPC_ACK 20 55cc7972eaSChristoph Paasch #define TCPOLEN_MPTCP_MPC_ACK_DATA 22 56f296234cSPeter Krystad #define TCPOLEN_MPTCP_MPJ_SYN 12 57f296234cSPeter Krystad #define TCPOLEN_MPTCP_MPJ_SYNACK 16 58f296234cSPeter Krystad #define TCPOLEN_MPTCP_MPJ_ACK 24 596d0060f6SMat Martineau #define TCPOLEN_MPTCP_DSS_BASE 4 60648ef4b8SMat Martineau #define TCPOLEN_MPTCP_DSS_ACK32 4 616d0060f6SMat Martineau #define TCPOLEN_MPTCP_DSS_ACK64 8 62648ef4b8SMat Martineau #define TCPOLEN_MPTCP_DSS_MAP32 10 636d0060f6SMat Martineau #define TCPOLEN_MPTCP_DSS_MAP64 14 646d0060f6SMat Martineau #define TCPOLEN_MPTCP_DSS_CHECKSUM 2 653df523abSPeter Krystad #define TCPOLEN_MPTCP_ADD_ADDR 16 6627ab92d9SDavide Caratti #define TCPOLEN_MPTCP_ADD_ADDR_PORT 18 673df523abSPeter Krystad #define TCPOLEN_MPTCP_ADD_ADDR_BASE 8 6827ab92d9SDavide Caratti #define TCPOLEN_MPTCP_ADD_ADDR_BASE_PORT 10 693df523abSPeter Krystad #define TCPOLEN_MPTCP_ADD_ADDR6 28 7027ab92d9SDavide Caratti #define TCPOLEN_MPTCP_ADD_ADDR6_PORT 30 713df523abSPeter Krystad #define TCPOLEN_MPTCP_ADD_ADDR6_BASE 20 7227ab92d9SDavide Caratti #define TCPOLEN_MPTCP_ADD_ADDR6_BASE_PORT 22 7327ab92d9SDavide Caratti #define TCPOLEN_MPTCP_PORT_LEN 2 7427ab92d9SDavide Caratti #define TCPOLEN_MPTCP_PORT_ALIGN 2 756445e17aSGeliang Tang #define TCPOLEN_MPTCP_RM_ADDR_BASE 3 76ec99a470SDavide Caratti #define TCPOLEN_MPTCP_PRIO 3 77ec99a470SDavide Caratti #define TCPOLEN_MPTCP_PRIO_ALIGN 4 7850c504a2SFlorian Westphal #define TCPOLEN_MPTCP_FASTCLOSE 12 79dc87efdbSFlorian Westphal #define TCPOLEN_MPTCP_RST 4 80c25aeb4eSGeliang Tang #define TCPOLEN_MPTCP_FAIL 12 81eda7acddSPeter Krystad 82208e8f66SGeliang Tang #define TCPOLEN_MPTCP_MPC_ACK_DATA_CSUM (TCPOLEN_MPTCP_DSS_CHECKSUM + TCPOLEN_MPTCP_MPC_ACK_DATA) 83208e8f66SGeliang Tang 84ec3edaa7SPeter Krystad /* MPTCP MP_JOIN flags */ 85f296234cSPeter Krystad #define MPTCPOPT_BACKUP BIT(0) 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 116e1ff9e82SDavide Caratti #define MPTCP_FALLBACK_DONE 4 1170e4f35d7SPaolo Abeni #define MPTCP_WORK_CLOSE_SUBFLOW 5 118e9d09bacSPaolo Abeni 119e9d09bacSPaolo Abeni /* MPTCP socket release cb flags */ 120e9d09bacSPaolo Abeni #define MPTCP_PUSH_PENDING 1 121e9d09bacSPaolo Abeni #define MPTCP_CLEAN_UNA 2 122e9d09bacSPaolo Abeni #define MPTCP_ERROR_REPORT 3 123e9d09bacSPaolo Abeni #define MPTCP_RETRANSMIT 4 124e9d09bacSPaolo Abeni #define MPTCP_FLUSH_JOIN_LIST 5 125e9d09bacSPaolo Abeni #define MPTCP_CONNECTED 6 1266d0060f6SMat Martineau 127dfc8d060SDmytro Shytyi struct mptcp_skb_cb { 128dfc8d060SDmytro Shytyi u64 map_seq; 129dfc8d060SDmytro Shytyi u64 end_seq; 130dfc8d060SDmytro Shytyi u32 offset; 131dfc8d060SDmytro Shytyi u8 has_rxtstamp:1; 132dfc8d060SDmytro Shytyi }; 133dfc8d060SDmytro Shytyi 134dfc8d060SDmytro Shytyi #define MPTCP_SKB_CB(__skb) ((struct mptcp_skb_cb *)&((__skb)->cb[0])) 135dfc8d060SDmytro Shytyi 136eaa2ffabSPaolo Abeni static inline bool before64(__u64 seq1, __u64 seq2) 137eaa2ffabSPaolo Abeni { 138eaa2ffabSPaolo Abeni return (__s64)(seq1 - seq2) < 0; 139eaa2ffabSPaolo Abeni } 140eaa2ffabSPaolo Abeni 141eaa2ffabSPaolo Abeni #define after64(seq2, seq1) before64(seq1, seq2) 142eaa2ffabSPaolo Abeni 143cfde141eSPaolo Abeni struct mptcp_options_received { 144cfde141eSPaolo Abeni u64 sndr_key; 145cfde141eSPaolo Abeni u64 rcvr_key; 146cfde141eSPaolo Abeni u64 data_ack; 147cfde141eSPaolo Abeni u64 data_seq; 148cfde141eSPaolo Abeni u32 subflow_seq; 149cfde141eSPaolo Abeni u16 data_len; 150208e8f66SGeliang Tang __sum16 csum; 15174c7dfbeSPaolo Abeni u16 suboptions; 152cfde141eSPaolo Abeni u32 token; 153cfde141eSPaolo Abeni u32 nonce; 154a086aebaSPaolo Abeni u16 use_map:1, 155cfde141eSPaolo Abeni dsn64:1, 156cfde141eSPaolo Abeni data_fin:1, 157cfde141eSPaolo Abeni use_ack:1, 158cfde141eSPaolo Abeni ack64:1, 159cfde141eSPaolo Abeni mpc_map:1, 160a086aebaSPaolo Abeni reset_reason:4, 161a086aebaSPaolo Abeni reset_transient:1, 162a086aebaSPaolo Abeni echo:1, 163a086aebaSPaolo Abeni backup:1, 164a086aebaSPaolo Abeni deny_join_id0:1, 165cfde141eSPaolo Abeni __unused:2; 166a086aebaSPaolo Abeni u8 join_id; 167a086aebaSPaolo Abeni u64 thmac; 168a086aebaSPaolo Abeni u8 hmac[MPTCPOPT_HMAC_LEN]; 169f7dafee1SGeliang Tang struct mptcp_addr_info addr; 1705c4a824dSGeliang Tang struct mptcp_rm_list rm_list; 171cfde141eSPaolo Abeni u64 ahmac; 1725580d41bSGeliang Tang u64 fail_seq; 173cfde141eSPaolo Abeni }; 174cfde141eSPaolo Abeni 1753df523abSPeter Krystad static inline __be32 mptcp_option(u8 subopt, u8 len, u8 nib, u8 field) 1763df523abSPeter Krystad { 1773df523abSPeter Krystad return htonl((TCPOPT_MPTCP << 24) | (len << 16) | (subopt << 12) | 1783df523abSPeter Krystad ((nib & 0xF) << 8) | field); 1793df523abSPeter Krystad } 1803df523abSPeter Krystad 1811b1c7a0eSPeter Krystad enum mptcp_pm_status { 1821b1c7a0eSPeter Krystad MPTCP_PM_ADD_ADDR_RECEIVED, 18384dfe367SGeliang Tang MPTCP_PM_ADD_ADDR_SEND_ACK, 184d0876b22SGeliang Tang MPTCP_PM_RM_ADDR_RECEIVED, 1851b1c7a0eSPeter Krystad MPTCP_PM_ESTABLISHED, 1861b1c7a0eSPeter Krystad MPTCP_PM_SUBFLOW_ESTABLISHED, 18786e39e04SPaolo Abeni MPTCP_PM_ALREADY_ESTABLISHED, /* persistent status, set after ESTABLISHED event */ 18886e39e04SPaolo Abeni MPTCP_PM_MPC_ENDPOINT_ACCOUNTED /* persistent status, set after MPC local address is 18986e39e04SPaolo Abeni * accounted int id_avail_bitmap 19086e39e04SPaolo Abeni */ 1911b1c7a0eSPeter Krystad }; 1921b1c7a0eSPeter Krystad 193d85a8fdeSMat Martineau enum mptcp_pm_type { 194d85a8fdeSMat Martineau MPTCP_PM_TYPE_KERNEL = 0, 195d85a8fdeSMat Martineau MPTCP_PM_TYPE_USERSPACE, 196d85a8fdeSMat Martineau 197d85a8fdeSMat Martineau __MPTCP_PM_TYPE_NR, 198d85a8fdeSMat Martineau __MPTCP_PM_TYPE_MAX = __MPTCP_PM_TYPE_NR - 1, 199d85a8fdeSMat Martineau }; 200d85a8fdeSMat Martineau 20186e39e04SPaolo Abeni /* Status bits below MPTCP_PM_ALREADY_ESTABLISHED need pm worker actions */ 20286e39e04SPaolo Abeni #define MPTCP_PM_WORK_MASK ((1 << MPTCP_PM_ALREADY_ESTABLISHED) - 1) 20386e39e04SPaolo Abeni 20413ad9f01SGeliang Tang enum mptcp_addr_signal_status { 205d91d322aSGeliang Tang MPTCP_ADD_ADDR_SIGNAL, 206d91d322aSGeliang Tang MPTCP_ADD_ADDR_ECHO, 20742842a42SGeliang Tang MPTCP_RM_ADDR_SIGNAL, 208d91d322aSGeliang Tang }; 209d91d322aSGeliang Tang 21086e39e04SPaolo Abeni /* max value of mptcp_addr_info.id */ 21186e39e04SPaolo Abeni #define MPTCP_PM_MAX_ADDR_ID U8_MAX 21286e39e04SPaolo Abeni 2131b1c7a0eSPeter Krystad struct mptcp_pm_data { 2141b1c7a0eSPeter Krystad struct mptcp_addr_info local; 2151b1c7a0eSPeter Krystad struct mptcp_addr_info remote; 216b6c08380SGeliang Tang struct list_head anno_list; 2174638de5aSKishen Maloor struct list_head userspace_pm_local_addr_list; 2181b1c7a0eSPeter Krystad 2191b1c7a0eSPeter Krystad spinlock_t lock; /*protects the whole PM data */ 2201b1c7a0eSPeter Krystad 22113ad9f01SGeliang Tang u8 addr_signal; 2221b1c7a0eSPeter Krystad bool server_side; 2231b1c7a0eSPeter Krystad bool work_pending; 2241b1c7a0eSPeter Krystad bool accept_addr; 2251b1c7a0eSPeter Krystad bool accept_subflow; 226df377be3SGeliang Tang bool remote_deny_join_id0; 2271b1c7a0eSPeter Krystad u8 add_addr_signaled; 2281b1c7a0eSPeter Krystad u8 add_addr_accepted; 2291b1c7a0eSPeter Krystad u8 local_addr_used; 230d85a8fdeSMat Martineau u8 pm_type; 2311b1c7a0eSPeter Krystad u8 subflows; 2321b1c7a0eSPeter Krystad u8 status; 23386e39e04SPaolo Abeni DECLARE_BITMAP(id_avail_bitmap, MPTCP_PM_MAX_ADDR_ID + 1); 234cbde2787SGeliang Tang struct mptcp_rm_list rm_list_tx; 235b5c55f33SGeliang Tang struct mptcp_rm_list rm_list_rx; 2361b1c7a0eSPeter Krystad }; 2371b1c7a0eSPeter Krystad 2384638de5aSKishen Maloor struct mptcp_pm_addr_entry { 2394638de5aSKishen Maloor struct list_head list; 2404638de5aSKishen Maloor struct mptcp_addr_info addr; 2414638de5aSKishen Maloor u8 flags; 2424638de5aSKishen Maloor int ifindex; 2434638de5aSKishen Maloor struct socket *lsk; 2444638de5aSKishen Maloor }; 2454638de5aSKishen Maloor 24618b683bfSPaolo Abeni struct mptcp_data_frag { 24718b683bfSPaolo Abeni struct list_head list; 24818b683bfSPaolo Abeni u64 data_seq; 249f0e6a4cfSPaolo Abeni u16 data_len; 250f0e6a4cfSPaolo Abeni u16 offset; 251f0e6a4cfSPaolo Abeni u16 overhead; 252f0e6a4cfSPaolo Abeni u16 already_sent; 25318b683bfSPaolo Abeni struct page *page; 25418b683bfSPaolo Abeni }; 25518b683bfSPaolo Abeni 256f870fa0bSMat Martineau /* MPTCP connection sock */ 257f870fa0bSMat Martineau struct mptcp_sock { 258f870fa0bSMat Martineau /* inet_connection_sock must be the first member */ 259f870fa0bSMat Martineau struct inet_connection_sock sk; 260cec37a6eSPeter Krystad u64 local_key; 261cec37a6eSPeter Krystad u64 remote_key; 2626d0060f6SMat Martineau u64 write_seq; 26338967f42SPaolo Abeni u64 bytes_sent; 264eaa2ffabSPaolo Abeni u64 snd_nxt; 26538967f42SPaolo Abeni u64 bytes_received; 2666d0060f6SMat Martineau u64 ack_seq; 267f3589be0SPaolo Abeni atomic64_t rcv_wnd_sent; 2683721b9b6SMat Martineau u64 rcv_data_fin_seq; 26938967f42SPaolo Abeni u64 bytes_retrans; 2706511882cSPaolo Abeni int rmem_fwd_alloc; 271d5f49190SPaolo Abeni int snd_burst; 272ea4ca586SPaolo Abeni int old_wspace; 2731e1d9d6fSPaolo Abeni u64 recovery_snd_nxt; /* in recovery mode accept up to this seq; 2741e1d9d6fSPaolo Abeni * recovery related fields are under data_lock 2751e1d9d6fSPaolo Abeni * protection 2761e1d9d6fSPaolo Abeni */ 27738967f42SPaolo Abeni u64 bytes_acked; 2787439d687SPaolo Abeni u64 snd_una; 2797439d687SPaolo Abeni u64 wnd_end; 280b51f9b80SPaolo Abeni unsigned long timer_ival; 28179c0949eSPeter Krystad u32 token; 28287952603SPaolo Abeni int rmem_released; 283648ef4b8SMat Martineau unsigned long flags; 284e9d09bacSPaolo Abeni unsigned long cb_flags; 285e9d09bacSPaolo Abeni unsigned long push_pending; 2861e1d9d6fSPaolo Abeni bool recovery; /* closing subflow write queue reinjected */ 287d22f4988SChristoph Paasch bool can_ack; 288b93df08cSPaolo Abeni bool fully_established; 2893721b9b6SMat Martineau bool rcv_data_fin; 2907279da61SMat Martineau bool snd_data_fin_enable; 29150c504a2SFlorian Westphal bool rcv_fastclose; 29237198e93SDavide Caratti bool use_64bit_ack; /* Set when we received a 64-bit DSN */ 293752e9067SGeliang Tang bool csum_enabled; 2940530020aSGeliang Tang bool allow_infinite_fallback; 2953ad14f54SPaolo Abeni u8 mpc_endpoint_id; 2964f6e14bdSMaxim Galaganov u8 recvmsg_inq:1, 2974f6e14bdSMaxim Galaganov cork:1, 29854f1944eSPaolo Abeni nodelay:1, 299b6985b9bSPaolo Abeni fastopening:1, 30039880bd8SPaolo Abeni in_accept_queue:1, 30139880bd8SPaolo Abeni free_first:1; 30280992017SPaolo Abeni struct work_struct work; 303ab174ad8SPaolo Abeni struct sk_buff *ooo_last_skb; 304ab174ad8SPaolo Abeni struct rb_root out_of_order_queue; 30587952603SPaolo Abeni struct sk_buff_head receive_queue; 306cec37a6eSPeter Krystad struct list_head conn_list; 30718b683bfSPaolo Abeni struct list_head rtx_queue; 308f0e6a4cfSPaolo Abeni struct mptcp_data_frag *first_pending; 309ec3edaa7SPeter Krystad struct list_head join_list; 31039880bd8SPaolo Abeni struct sock *first; /* The mptcp ops can safely dereference, using suitable 3115b825727SPaolo Abeni * ONCE annotation, the subflow outside the socket 3125b825727SPaolo Abeni * lock as such sock is freed after close(). 3135b825727SPaolo Abeni */ 3141b1c7a0eSPeter Krystad struct mptcp_pm_data pm; 3151730b2b2SGeliang Tang struct mptcp_sched_ops *sched; 316a6b118feSFlorian Westphal struct { 317a6b118feSFlorian Westphal u32 space; /* bytes copied in last measurement window */ 318a6b118feSFlorian Westphal u32 copied; /* bytes copied in this measurement window */ 319a6b118feSFlorian Westphal u64 time; /* start time of measurement window */ 320a6b118feSFlorian Westphal u64 rtt_us; /* last maximum rtt of subflows */ 321a6b118feSFlorian Westphal } rcvq_space; 322b8dc6d6cSPaolo Abeni u8 scaling_ratio; 323df00b087SFlorian Westphal 3246f06b4d4SPaolo Abeni u32 subflow_id; 325df00b087SFlorian Westphal u32 setsockopt_seq; 32620b5759fSPaolo Abeni char ca_name[TCP_CA_NAME_MAX]; 327f870fa0bSMat Martineau }; 328f870fa0bSMat Martineau 32987952603SPaolo Abeni #define mptcp_data_lock(sk) spin_lock_bh(&(sk)->sk_lock.slock) 33087952603SPaolo Abeni #define mptcp_data_unlock(sk) spin_unlock_bh(&(sk)->sk_lock.slock) 33187952603SPaolo Abeni 332cec37a6eSPeter Krystad #define mptcp_for_each_subflow(__msk, __subflow) \ 333cec37a6eSPeter Krystad list_for_each_entry(__subflow, &((__msk)->conn_list), node) 3345efbf6f7SMatthieu Baerts #define mptcp_for_each_subflow_safe(__msk, __subflow, __tmp) \ 3355efbf6f7SMatthieu Baerts list_for_each_entry_safe(__subflow, __tmp, &((__msk)->conn_list), node) 336cec37a6eSPeter Krystad 3373abc05d9SFlorian Westphal static inline void msk_owned_by_me(const struct mptcp_sock *msk) 3383abc05d9SFlorian Westphal { 3393abc05d9SFlorian Westphal sock_owned_by_me((const struct sock *)msk); 3403abc05d9SFlorian Westphal } 3413abc05d9SFlorian Westphal 342403a40f2SEric Dumazet #define mptcp_sk(ptr) container_of_const(ptr, struct mptcp_sock, sk.icsk_inet.sk) 343f870fa0bSMat Martineau 344ce599c51SPaolo Abeni /* the msk socket don't use the backlog, also account for the bulk 345ce599c51SPaolo Abeni * free memory 346ce599c51SPaolo Abeni */ 347ce599c51SPaolo Abeni static inline int __mptcp_rmem(const struct sock *sk) 348ce599c51SPaolo Abeni { 349ce599c51SPaolo Abeni return atomic_read(&sk->sk_rmem_alloc) - READ_ONCE(mptcp_sk(sk)->rmem_released); 350ce599c51SPaolo Abeni } 351ce599c51SPaolo Abeni 352b8dc6d6cSPaolo Abeni static inline int mptcp_win_from_space(const struct sock *sk, int space) 353b8dc6d6cSPaolo Abeni { 354b8dc6d6cSPaolo Abeni return __tcp_win_from_space(mptcp_sk(sk)->scaling_ratio, space); 355b8dc6d6cSPaolo Abeni } 356b8dc6d6cSPaolo Abeni 357ea4ca586SPaolo Abeni static inline int __mptcp_space(const struct sock *sk) 358ea4ca586SPaolo Abeni { 359b8dc6d6cSPaolo Abeni return mptcp_win_from_space(sk, READ_ONCE(sk->sk_rcvbuf) - __mptcp_rmem(sk)); 360ea4ca586SPaolo Abeni } 361ea4ca586SPaolo Abeni 362f0e6a4cfSPaolo Abeni static inline struct mptcp_data_frag *mptcp_send_head(const struct sock *sk) 363f0e6a4cfSPaolo Abeni { 364f0e6a4cfSPaolo Abeni const struct mptcp_sock *msk = mptcp_sk(sk); 365f0e6a4cfSPaolo Abeni 366f0e6a4cfSPaolo Abeni return READ_ONCE(msk->first_pending); 367f0e6a4cfSPaolo Abeni } 368f0e6a4cfSPaolo Abeni 369f0e6a4cfSPaolo Abeni static inline struct mptcp_data_frag *mptcp_send_next(struct sock *sk) 370f0e6a4cfSPaolo Abeni { 371f0e6a4cfSPaolo Abeni struct mptcp_sock *msk = mptcp_sk(sk); 372f0e6a4cfSPaolo Abeni struct mptcp_data_frag *cur; 373f0e6a4cfSPaolo Abeni 374f0e6a4cfSPaolo Abeni cur = msk->first_pending; 375f0e6a4cfSPaolo Abeni return list_is_last(&cur->list, &msk->rtx_queue) ? NULL : 376f0e6a4cfSPaolo Abeni list_next_entry(cur, list); 377f0e6a4cfSPaolo Abeni } 378f0e6a4cfSPaolo Abeni 379f0e6a4cfSPaolo Abeni static inline struct mptcp_data_frag *mptcp_pending_tail(const struct sock *sk) 380f0e6a4cfSPaolo Abeni { 381403a40f2SEric Dumazet const struct mptcp_sock *msk = mptcp_sk(sk); 382f0e6a4cfSPaolo Abeni 383f0e6a4cfSPaolo Abeni if (!msk->first_pending) 384f0e6a4cfSPaolo Abeni return NULL; 385f0e6a4cfSPaolo Abeni 386f0e6a4cfSPaolo Abeni if (WARN_ON_ONCE(list_empty(&msk->rtx_queue))) 387f0e6a4cfSPaolo Abeni return NULL; 388f0e6a4cfSPaolo Abeni 389f0e6a4cfSPaolo Abeni return list_last_entry(&msk->rtx_queue, struct mptcp_data_frag, list); 390f0e6a4cfSPaolo Abeni } 391f0e6a4cfSPaolo Abeni 392403a40f2SEric Dumazet static inline struct mptcp_data_frag *mptcp_rtx_head(struct sock *sk) 3937948f6ccSFlorian Westphal { 3947948f6ccSFlorian Westphal struct mptcp_sock *msk = mptcp_sk(sk); 3957948f6ccSFlorian Westphal 39664b9cea7SPaolo Abeni if (msk->snd_una == READ_ONCE(msk->snd_nxt)) 39764b9cea7SPaolo Abeni return NULL; 39864b9cea7SPaolo Abeni 399a386bc5bSGeliang Tang return list_first_entry_or_null(&msk->rtx_queue, struct mptcp_data_frag, list); 4007948f6ccSFlorian Westphal } 4017948f6ccSFlorian Westphal 402d0cc2987SGeliang Tang struct csum_pseudo_header { 403d0cc2987SGeliang Tang __be64 data_seq; 404d0cc2987SGeliang Tang __be32 subflow_seq; 405d0cc2987SGeliang Tang __be16 data_len; 406d0cc2987SGeliang Tang __sum16 csum; 407d0cc2987SGeliang Tang }; 408d0cc2987SGeliang Tang 409cec37a6eSPeter Krystad struct mptcp_subflow_request_sock { 410cec37a6eSPeter Krystad struct tcp_request_sock sk; 411d22f4988SChristoph Paasch u16 mp_capable : 1, 412cec37a6eSPeter Krystad mp_join : 1, 41306fe1719SGeliang Tang backup : 1, 414bab6b88eSGeliang Tang csum_reqd : 1, 415bab6b88eSGeliang Tang allow_join_id0 : 1; 4161b1c7a0eSPeter Krystad u8 local_id; 417f296234cSPeter Krystad u8 remote_id; 418cec37a6eSPeter Krystad u64 local_key; 41979c0949eSPeter Krystad u64 idsn; 42079c0949eSPeter Krystad u32 token; 421648ef4b8SMat Martineau u32 ssn_offset; 422f296234cSPeter Krystad u64 thmac; 423f296234cSPeter Krystad u32 local_nonce; 424f296234cSPeter Krystad u32 remote_nonce; 4258fd4de12SPaolo Abeni struct mptcp_sock *msk; 4262c5ebd00SPaolo Abeni struct hlist_nulls_node token_node; 427cec37a6eSPeter Krystad }; 428cec37a6eSPeter Krystad 429cec37a6eSPeter Krystad static inline struct mptcp_subflow_request_sock * 430cec37a6eSPeter Krystad mptcp_subflow_rsk(const struct request_sock *rsk) 431cec37a6eSPeter Krystad { 432cec37a6eSPeter Krystad return (struct mptcp_subflow_request_sock *)rsk; 433cec37a6eSPeter Krystad } 434cec37a6eSPeter Krystad 4356719331cSPaolo Abeni enum mptcp_data_avail { 4366719331cSPaolo Abeni MPTCP_SUBFLOW_NODATA, 4376719331cSPaolo Abeni MPTCP_SUBFLOW_DATA_AVAIL, 4386719331cSPaolo Abeni }; 4396719331cSPaolo Abeni 440b19bc294SPaolo Abeni struct mptcp_delegated_action { 441b19bc294SPaolo Abeni struct napi_struct napi; 442b19bc294SPaolo Abeni struct list_head head; 443b19bc294SPaolo Abeni }; 444b19bc294SPaolo Abeni 445b19bc294SPaolo Abeni DECLARE_PER_CPU(struct mptcp_delegated_action, mptcp_delegated_actions); 446b19bc294SPaolo Abeni 447*a5efdbceSPaolo Abeni #define MPTCP_DELEGATE_SCHEDULED 0 448*a5efdbceSPaolo Abeni #define MPTCP_DELEGATE_SEND 1 449*a5efdbceSPaolo Abeni #define MPTCP_DELEGATE_ACK 2 450b19bc294SPaolo Abeni 451*a5efdbceSPaolo Abeni #define MPTCP_DELEGATE_ACTIONS_MASK (~BIT(MPTCP_DELEGATE_SCHEDULED)) 4522303f994SPeter Krystad /* MPTCP subflow context */ 4532303f994SPeter Krystad struct mptcp_subflow_context { 454cec37a6eSPeter Krystad struct list_head node;/* conn_list of subflows */ 455b29fcfb5SPaolo Abeni 45663ec72bdSKees Cook struct_group(reset, 457b29fcfb5SPaolo Abeni 4583ce0852cSPaolo Abeni unsigned long avg_pacing_rate; /* protected by msk socket lock */ 459cec37a6eSPeter Krystad u64 local_key; 460cec37a6eSPeter Krystad u64 remote_key; 46179c0949eSPeter Krystad u64 idsn; 462648ef4b8SMat Martineau u64 map_seq; 463cc7972eaSChristoph Paasch u32 snd_isn; 46479c0949eSPeter Krystad u32 token; 4656d0060f6SMat Martineau u32 rel_write_seq; 466648ef4b8SMat Martineau u32 map_subflow_seq; 467648ef4b8SMat Martineau u32 ssn_offset; 468648ef4b8SMat Martineau u32 map_data_len; 469dd8bcd17SPaolo Abeni __wsum map_data_csum; 470dd8bcd17SPaolo Abeni u32 map_csum_len; 471cec37a6eSPeter Krystad u32 request_mptcp : 1, /* send MP_CAPABLE */ 472ec3edaa7SPeter Krystad request_join : 1, /* send MP_JOIN */ 473ec3edaa7SPeter Krystad request_bkup : 1, 474cec37a6eSPeter Krystad mp_capable : 1, /* remote is MPTCP capable */ 475f296234cSPeter Krystad mp_join : 1, /* remote is JOINing */ 4760be534f5SPaolo Abeni fully_established : 1, /* path validated */ 477f296234cSPeter Krystad pm_notified : 1, /* PM hook called for established status */ 478648ef4b8SMat Martineau conn_finished : 1, 479648ef4b8SMat Martineau map_valid : 1, 480dd8bcd17SPaolo Abeni map_csum_reqd : 1, 481dd8bcd17SPaolo Abeni map_data_fin : 1, 482d22f4988SChristoph Paasch mpc_map : 1, 483f296234cSPeter Krystad backup : 1, 48406706542SGeliang Tang send_mp_prio : 1, 485c25aeb4eSGeliang Tang send_mp_fail : 1, 486f284c0c7SPaolo Abeni send_fastclose : 1, 4871e39e5a3SGeliang Tang send_infinite_map : 1, 488b3ea6b27SPaolo Abeni remote_key_valid : 1, /* received the peer key from */ 489ff5a0b42SPaolo Abeni disposable : 1, /* ctx can be free at ulp release time */ 4904cf86ae8SPaolo Abeni stale : 1, /* unable to snd/rcv data, do not use for xmit */ 491ae66fb2bSMat Martineau local_id_valid : 1, /* local_id is correctly initialized */ 492dfc8d060SDmytro Shytyi valid_csum_seen : 1, /* at least one csum validated */ 493dfc8d060SDmytro Shytyi is_mptfo : 1, /* subflow is doing TFO */ 494b7535cfeSPaolo Abeni __unused : 9; 4956719331cSPaolo Abeni enum mptcp_data_avail data_avail; 496fce68b03SGeliang Tang bool scheduled; 497f296234cSPeter Krystad u32 remote_nonce; 498f296234cSPeter Krystad u64 thmac; 499f296234cSPeter Krystad u32 local_nonce; 500ec3edaa7SPeter Krystad u32 remote_token; 501b3ea6b27SPaolo Abeni union { 502b3ea6b27SPaolo Abeni u8 hmac[MPTCPOPT_HMAC_LEN]; /* MPJ subflow only */ 503b3ea6b27SPaolo Abeni u64 iasn; /* initial ack sequence number, MPC subflows only */ 504b3ea6b27SPaolo Abeni }; 505f296234cSPeter Krystad u8 local_id; 506f296234cSPeter Krystad u8 remote_id; 507dc87efdbSFlorian Westphal u8 reset_seen:1; 508dc87efdbSFlorian Westphal u8 reset_transient:1; 509dc87efdbSFlorian Westphal u8 reset_reason:4; 51071b7dec2SPaolo Abeni u8 stale_count; 511648ef4b8SMat Martineau 5126f06b4d4SPaolo Abeni u32 subflow_id; 5136f06b4d4SPaolo Abeni 514b19bc294SPaolo Abeni long delegated_status; 51576a13b31SGeliang Tang unsigned long fail_tout; 516b29fcfb5SPaolo Abeni 51763ec72bdSKees Cook ); 518b29fcfb5SPaolo Abeni 519b19bc294SPaolo Abeni struct list_head delegated_node; /* link into delegated_action, protected by local BH */ 520b19bc294SPaolo Abeni 521df00b087SFlorian Westphal u32 setsockopt_seq; 52271b7dec2SPaolo Abeni u32 stale_rcv_tstamp; 523df00b087SFlorian Westphal 5242303f994SPeter Krystad struct sock *tcp_sock; /* tcp sk backpointer */ 5252303f994SPeter Krystad struct sock *conn; /* parent mptcp_sock */ 526cec37a6eSPeter Krystad const struct inet_connection_sock_af_ops *icsk_af_ops; 527648ef4b8SMat Martineau void (*tcp_state_change)(struct sock *sk); 52815cc1045SPaolo Abeni void (*tcp_error_report)(struct sock *sk); 529648ef4b8SMat Martineau 5302303f994SPeter Krystad struct rcu_head rcu; 5312303f994SPeter Krystad }; 5322303f994SPeter Krystad 5332303f994SPeter Krystad static inline struct mptcp_subflow_context * 5342303f994SPeter Krystad mptcp_subflow_ctx(const struct sock *sk) 5352303f994SPeter Krystad { 5362303f994SPeter Krystad struct inet_connection_sock *icsk = inet_csk(sk); 5372303f994SPeter Krystad 5382303f994SPeter Krystad /* Use RCU on icsk_ulp_data only for sock diag code */ 5392303f994SPeter Krystad return (__force struct mptcp_subflow_context *)icsk->icsk_ulp_data; 5402303f994SPeter Krystad } 5412303f994SPeter Krystad 5422303f994SPeter Krystad static inline struct sock * 5432303f994SPeter Krystad mptcp_subflow_tcp_sock(const struct mptcp_subflow_context *subflow) 5442303f994SPeter Krystad { 5452303f994SPeter Krystad return subflow->tcp_sock; 5462303f994SPeter Krystad } 5472303f994SPeter Krystad 548b29fcfb5SPaolo Abeni static inline void 549b29fcfb5SPaolo Abeni mptcp_subflow_ctx_reset(struct mptcp_subflow_context *subflow) 550b29fcfb5SPaolo Abeni { 55163ec72bdSKees Cook memset(&subflow->reset, 0, sizeof(subflow->reset)); 552b29fcfb5SPaolo Abeni subflow->request_mptcp = 1; 553b29fcfb5SPaolo Abeni } 554b29fcfb5SPaolo Abeni 555648ef4b8SMat Martineau static inline u64 556648ef4b8SMat Martineau mptcp_subflow_get_map_offset(const struct mptcp_subflow_context *subflow) 557648ef4b8SMat Martineau { 558648ef4b8SMat Martineau return tcp_sk(mptcp_subflow_tcp_sock(subflow))->copied_seq - 559648ef4b8SMat Martineau subflow->ssn_offset - 560648ef4b8SMat Martineau subflow->map_subflow_seq; 561648ef4b8SMat Martineau } 562648ef4b8SMat Martineau 563648ef4b8SMat Martineau static inline u64 564648ef4b8SMat Martineau mptcp_subflow_get_mapped_dsn(const struct mptcp_subflow_context *subflow) 565648ef4b8SMat Martineau { 566648ef4b8SMat Martineau return subflow->map_seq + mptcp_subflow_get_map_offset(subflow); 567648ef4b8SMat Martineau } 568648ef4b8SMat Martineau 569*a5efdbceSPaolo Abeni void mptcp_subflow_process_delegated(struct sock *ssk, long actions); 570b19bc294SPaolo Abeni 571bcd97734SPaolo Abeni static inline void mptcp_subflow_delegate(struct mptcp_subflow_context *subflow, int action) 572b19bc294SPaolo Abeni { 573*a5efdbceSPaolo Abeni long old, set_bits = BIT(MPTCP_DELEGATE_SCHEDULED) | BIT(action); 574b19bc294SPaolo Abeni struct mptcp_delegated_action *delegated; 575b19bc294SPaolo Abeni bool schedule; 576b19bc294SPaolo Abeni 577bcd97734SPaolo Abeni /* the caller held the subflow bh socket lock */ 578bcd97734SPaolo Abeni lockdep_assert_in_softirq(); 579bcd97734SPaolo Abeni 580*a5efdbceSPaolo Abeni /* The implied barrier pairs with tcp_release_cb_override() 581*a5efdbceSPaolo Abeni * mptcp_napi_poll(), and ensures the below list check sees list 582*a5efdbceSPaolo Abeni * updates done prior to delegated status bits changes 583b19bc294SPaolo Abeni */ 584*a5efdbceSPaolo Abeni old = set_mask_bits(&subflow->delegated_status, 0, set_bits); 585*a5efdbceSPaolo Abeni if (!(old & BIT(MPTCP_DELEGATE_SCHEDULED))) { 586*a5efdbceSPaolo Abeni if (WARN_ON_ONCE(!list_empty(&subflow->delegated_node))) 587b19bc294SPaolo Abeni return; 588b19bc294SPaolo Abeni 589b19bc294SPaolo Abeni delegated = this_cpu_ptr(&mptcp_delegated_actions); 590b19bc294SPaolo Abeni schedule = list_empty(&delegated->head); 591b19bc294SPaolo Abeni list_add_tail(&subflow->delegated_node, &delegated->head); 592b19bc294SPaolo Abeni sock_hold(mptcp_subflow_tcp_sock(subflow)); 593b19bc294SPaolo Abeni if (schedule) 594b19bc294SPaolo Abeni napi_schedule(&delegated->napi); 595b19bc294SPaolo Abeni } 596b19bc294SPaolo Abeni } 597b19bc294SPaolo Abeni 598b19bc294SPaolo Abeni static inline struct mptcp_subflow_context * 599b19bc294SPaolo Abeni mptcp_subflow_delegated_next(struct mptcp_delegated_action *delegated) 600b19bc294SPaolo Abeni { 601b19bc294SPaolo Abeni struct mptcp_subflow_context *ret; 602b19bc294SPaolo Abeni 603b19bc294SPaolo Abeni if (list_empty(&delegated->head)) 604b19bc294SPaolo Abeni return NULL; 605b19bc294SPaolo Abeni 606b19bc294SPaolo Abeni ret = list_first_entry(&delegated->head, struct mptcp_subflow_context, delegated_node); 607b19bc294SPaolo Abeni list_del_init(&ret->delegated_node); 608b19bc294SPaolo Abeni return ret; 609b19bc294SPaolo Abeni } 610b19bc294SPaolo Abeni 6116da14d74SPaolo Abeni int mptcp_is_enabled(const struct net *net); 6126da14d74SPaolo Abeni unsigned int mptcp_get_add_addr_timeout(const struct net *net); 6136da14d74SPaolo Abeni int mptcp_is_checksum_enabled(const struct net *net); 6146da14d74SPaolo Abeni int mptcp_allow_join_id0(const struct net *net); 615ff5a0b42SPaolo Abeni unsigned int mptcp_stale_loss_cnt(const struct net *net); 6166bb63cccSMat Martineau int mptcp_get_pm_type(const struct net *net); 617e3b2870bSGeliang Tang const char *mptcp_get_scheduler(const struct net *net); 618b93df08cSPaolo Abeni void mptcp_subflow_fully_established(struct mptcp_subflow_context *subflow, 619b3ea6b27SPaolo Abeni const struct mptcp_options_received *mp_opt); 6201e1d9d6fSPaolo Abeni bool __mptcp_retransmit_pending_data(struct sock *sk); 6218b38217aSMaxim Galaganov void mptcp_check_and_set_pending(struct sock *sk); 622ff5a0b42SPaolo Abeni void __mptcp_push_pending(struct sock *sk, unsigned int flags); 623648ef4b8SMat Martineau bool mptcp_subflow_data_available(struct sock *sk); 624d39dcecaSPaolo Abeni void __init mptcp_subflow_init(void); 625d0876b22SGeliang Tang void mptcp_subflow_shutdown(struct sock *sk, struct sock *ssk, int how); 626a141e02eSFlorian Westphal void mptcp_close_ssk(struct sock *sk, struct sock *ssk, 627e16163b6SPaolo Abeni struct mptcp_subflow_context *subflow); 628a6574302SMat Martineau void __mptcp_subflow_send_ack(struct sock *ssk); 629d5824847SPaolo Abeni void mptcp_subflow_reset(struct sock *ssk); 6302a6a870eSPaolo Abeni void mptcp_subflow_queue_clean(struct sock *sk, struct sock *ssk); 631866f26f2SPaolo Abeni void mptcp_sock_graft(struct sock *sk, struct socket *parent); 6323f326a82SPaolo Abeni struct sock *__mptcp_nmpc_sk(struct mptcp_sock *msk); 63326d3e21cSMenglong Dong bool __mptcp_close(struct sock *sk, long timeout); 63430e51b92SMenglong Dong void mptcp_cancel_work(struct sock *sk); 63563740448SPaolo Abeni void __mptcp_unaccepted_force_close(struct sock *sk); 63636b122baSDmytro Shytyi void mptcp_set_owner_r(struct sk_buff *skb, struct sock *sk); 637ec3edaa7SPeter Krystad 6384638de5aSKishen Maloor bool mptcp_addresses_equal(const struct mptcp_addr_info *a, 6394638de5aSKishen Maloor const struct mptcp_addr_info *b, bool use_port); 640dc886bceSGeliang Tang void mptcp_local_address(const struct sock_common *skc, struct mptcp_addr_info *addr); 6414638de5aSKishen Maloor 642ec3edaa7SPeter Krystad /* called with sk socket lock held */ 643ef0da3b8SPaolo Abeni int __mptcp_subflow_connect(struct sock *sk, const struct mptcp_addr_info *loc, 644ee285257SGeliang Tang const struct mptcp_addr_info *remote); 6456bc1fe7dSPaolo Abeni int mptcp_subflow_create_socket(struct sock *sk, unsigned short family, 6466bc1fe7dSPaolo Abeni struct socket **new_sock); 6471729cf18SGeliang Tang void mptcp_info2sockaddr(const struct mptcp_addr_info *info, 6481729cf18SGeliang Tang struct sockaddr_storage *addr, 6491729cf18SGeliang Tang unsigned short family); 650740ebe35SGeliang Tang struct mptcp_sched_ops *mptcp_sched_find(const char *name); 651740ebe35SGeliang Tang int mptcp_register_scheduler(struct mptcp_sched_ops *sched); 652740ebe35SGeliang Tang void mptcp_unregister_scheduler(struct mptcp_sched_ops *sched); 653ed1ad86bSGeliang Tang void mptcp_sched_init(void); 6541730b2b2SGeliang Tang int mptcp_init_sched(struct mptcp_sock *msk, 6551730b2b2SGeliang Tang struct mptcp_sched_ops *sched); 6561730b2b2SGeliang Tang void mptcp_release_sched(struct mptcp_sock *msk); 657fce68b03SGeliang Tang void mptcp_subflow_set_scheduled(struct mptcp_subflow_context *subflow, 658fce68b03SGeliang Tang bool scheduled); 65907336a87SGeliang Tang struct sock *mptcp_subflow_get_send(struct mptcp_sock *msk); 66007336a87SGeliang Tang struct sock *mptcp_subflow_get_retrans(struct mptcp_sock *msk); 66107336a87SGeliang Tang int mptcp_sched_get_send(struct mptcp_sock *msk); 66207336a87SGeliang Tang int mptcp_sched_get_retrans(struct mptcp_sock *msk); 6632303f994SPeter Krystad 664c886d702SPaolo Abeni static inline bool __tcp_can_send(const struct sock *ssk) 665c886d702SPaolo Abeni { 666c886d702SPaolo Abeni /* only send if our side has not closed yet */ 667c886d702SPaolo Abeni return ((1 << inet_sk_state_load(ssk)) & (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT)); 668c886d702SPaolo Abeni } 669c886d702SPaolo Abeni 670ff5a0b42SPaolo Abeni static inline bool __mptcp_subflow_active(struct mptcp_subflow_context *subflow) 67143f1140bSGeliang Tang { 67243f1140bSGeliang Tang /* can't send if JOIN hasn't completed yet (i.e. is usable for mptcp) */ 67343f1140bSGeliang Tang if (subflow->request_join && !subflow->fully_established) 67443f1140bSGeliang Tang return false; 67543f1140bSGeliang Tang 676c886d702SPaolo Abeni return __tcp_can_send(mptcp_subflow_tcp_sock(subflow)); 67743f1140bSGeliang Tang } 67843f1140bSGeliang Tang 679ff5a0b42SPaolo Abeni void mptcp_subflow_set_active(struct mptcp_subflow_context *subflow); 680ff5a0b42SPaolo Abeni 681ff5a0b42SPaolo Abeni bool mptcp_subflow_active(struct mptcp_subflow_context *subflow); 682ff5a0b42SPaolo Abeni 683b6985b9bSPaolo Abeni void mptcp_subflow_drop_ctx(struct sock *ssk); 684b6985b9bSPaolo Abeni 685648ef4b8SMat Martineau static inline void mptcp_subflow_tcp_fallback(struct sock *sk, 686648ef4b8SMat Martineau struct mptcp_subflow_context *ctx) 687648ef4b8SMat Martineau { 688952382c6SFlorian Westphal sk->sk_data_ready = sock_def_readable; 689648ef4b8SMat Martineau sk->sk_state_change = ctx->tcp_state_change; 690952382c6SFlorian Westphal sk->sk_write_space = sk_stream_write_space; 69115cc1045SPaolo Abeni sk->sk_error_report = ctx->tcp_error_report; 692648ef4b8SMat Martineau 693648ef4b8SMat Martineau inet_csk(sk)->icsk_af_ops = ctx->icsk_af_ops; 694648ef4b8SMat Martineau } 695648ef4b8SMat Martineau 696d39dcecaSPaolo Abeni void __init mptcp_proto_init(void); 697784325e9SMatthieu Baerts #if IS_ENABLED(CONFIG_MPTCP_IPV6) 698d39dcecaSPaolo Abeni int __init mptcp_proto_v6_init(void); 699784325e9SMatthieu Baerts #endif 700648ef4b8SMat Martineau 7017e8b88ecSPaolo Abeni struct sock *mptcp_sk_clone_init(const struct sock *sk, 702cfde141eSPaolo Abeni const struct mptcp_options_received *mp_opt, 7037e8b88ecSPaolo Abeni struct sock *ssk, 704fca5c82cSPaolo Abeni struct request_sock *req); 7050799e21bSGeliang Tang void mptcp_get_options(const struct sk_buff *skb, 706cfde141eSPaolo Abeni struct mptcp_options_received *mp_opt); 707cec37a6eSPeter Krystad 708cec37a6eSPeter Krystad void mptcp_finish_connect(struct sock *sk); 709490274b4SPaolo Abeni void __mptcp_set_connected(struct sock *sk); 710f6909dc1SPaolo Abeni void mptcp_reset_tout_timer(struct mptcp_sock *msk, unsigned long fail_tout); 71127e5ccc2SPaolo Abeni 71227e5ccc2SPaolo Abeni static inline void mptcp_stop_tout_timer(struct sock *sk) 71327e5ccc2SPaolo Abeni { 71427e5ccc2SPaolo Abeni if (!inet_csk(sk)->icsk_mtup.probe_timestamp) 71527e5ccc2SPaolo Abeni return; 71627e5ccc2SPaolo Abeni 71727e5ccc2SPaolo Abeni sk_stop_timer(sk, &sk->sk_timer); 71827e5ccc2SPaolo Abeni inet_csk(sk)->icsk_mtup.probe_timestamp = 0; 71927e5ccc2SPaolo Abeni } 72027e5ccc2SPaolo Abeni 72127e5ccc2SPaolo Abeni static inline void mptcp_set_close_tout(struct sock *sk, unsigned long tout) 72227e5ccc2SPaolo Abeni { 72327e5ccc2SPaolo Abeni /* avoid 0 timestamp, as that means no close timeout */ 72427e5ccc2SPaolo Abeni inet_csk(sk)->icsk_mtup.probe_timestamp = tout ? : 1; 72527e5ccc2SPaolo Abeni } 72627e5ccc2SPaolo Abeni 72727e5ccc2SPaolo Abeni static inline void mptcp_start_tout_timer(struct sock *sk) 72827e5ccc2SPaolo Abeni { 72927e5ccc2SPaolo Abeni mptcp_set_close_tout(sk, tcp_jiffies32); 73027e5ccc2SPaolo Abeni mptcp_reset_tout_timer(mptcp_sk(sk), 0); 73127e5ccc2SPaolo Abeni } 73227e5ccc2SPaolo Abeni 733b93df08cSPaolo Abeni static inline bool mptcp_is_fully_established(struct sock *sk) 734b93df08cSPaolo Abeni { 735b93df08cSPaolo Abeni return inet_sk_state_load(sk) == TCP_ESTABLISHED && 736b93df08cSPaolo Abeni READ_ONCE(mptcp_sk(sk)->fully_established); 737b93df08cSPaolo Abeni } 738a6b118feSFlorian Westphal void mptcp_rcv_space_init(struct mptcp_sock *msk, const struct sock *ssk); 7392e52213cSFlorian Westphal void mptcp_data_ready(struct sock *sk, struct sock *ssk); 740f296234cSPeter Krystad bool mptcp_finish_join(struct sock *sk); 741ba8f48f7SPaolo Abeni bool mptcp_schedule_work(struct sock *sk); 7420abdde82SPaolo Abeni int mptcp_setsockopt(struct sock *sk, int level, int optname, 7430abdde82SPaolo Abeni sockptr_t optval, unsigned int optlen); 7440abdde82SPaolo Abeni int mptcp_getsockopt(struct sock *sk, int level, int optname, 7450abdde82SPaolo Abeni char __user *optval, int __user *option); 7460abdde82SPaolo Abeni 7471502328fSPaolo Abeni u64 __mptcp_expand_seq(u64 old_seq, u64 cur_seq); 7481502328fSPaolo Abeni static inline u64 mptcp_expand_seq(u64 old_seq, u64 cur_seq, bool use_64bit) 7491502328fSPaolo Abeni { 7501502328fSPaolo Abeni if (use_64bit) 7511502328fSPaolo Abeni return cur_seq; 7521502328fSPaolo Abeni 7531502328fSPaolo Abeni return __mptcp_expand_seq(old_seq, cur_seq); 7541502328fSPaolo Abeni } 755219d0499SPaolo Abeni void __mptcp_check_push(struct sock *sk, struct sock *ssk); 7567439d687SPaolo Abeni void __mptcp_data_acked(struct sock *sk); 75715cc1045SPaolo Abeni void __mptcp_error_report(struct sock *sk); 7581a49b2c2SMat Martineau bool mptcp_update_rcv_data_fin(struct mptcp_sock *msk, u64 data_fin_seq, bool use_64bit); 759e16163b6SPaolo Abeni static inline bool mptcp_data_fin_enabled(const struct mptcp_sock *msk) 760e16163b6SPaolo Abeni { 761e16163b6SPaolo Abeni return READ_ONCE(msk->snd_data_fin_enable) && 762e16163b6SPaolo Abeni READ_ONCE(msk->write_seq) == READ_ONCE(msk->snd_nxt); 763e16163b6SPaolo Abeni } 764e16163b6SPaolo Abeni 7655cf92bbaSPaolo Abeni static inline bool mptcp_propagate_sndbuf(struct sock *sk, struct sock *ssk) 7665cf92bbaSPaolo Abeni { 7675cf92bbaSPaolo Abeni if ((sk->sk_userlocks & SOCK_SNDBUF_LOCK) || ssk->sk_sndbuf <= READ_ONCE(sk->sk_sndbuf)) 7685cf92bbaSPaolo Abeni return false; 7695cf92bbaSPaolo Abeni 7705cf92bbaSPaolo Abeni WRITE_ONCE(sk->sk_sndbuf, ssk->sk_sndbuf); 7715cf92bbaSPaolo Abeni return true; 7725cf92bbaSPaolo Abeni } 7735cf92bbaSPaolo Abeni 7745cf92bbaSPaolo Abeni static inline void mptcp_write_space(struct sock *sk) 7755cf92bbaSPaolo Abeni { 7765cf92bbaSPaolo Abeni if (sk_stream_is_writeable(sk)) { 7775cf92bbaSPaolo Abeni /* pairs with memory barrier in mptcp_poll */ 7785cf92bbaSPaolo Abeni smp_mb(); 7795cf92bbaSPaolo Abeni if (test_and_clear_bit(MPTCP_NOSPACE, &mptcp_sk(sk)->flags)) 7805cf92bbaSPaolo Abeni sk_stream_write_space(sk); 7815cf92bbaSPaolo Abeni } 7825cf92bbaSPaolo Abeni } 7835cf92bbaSPaolo Abeni 784c0bf3c6aSPaolo Abeni void mptcp_destroy_common(struct mptcp_sock *msk, unsigned int flags); 785cec37a6eSPeter Krystad 786c68a0cd1SJianguo Wu #define MPTCP_TOKEN_MAX_RETRIES 4 787c68a0cd1SJianguo Wu 7882c5ebd00SPaolo Abeni void __init mptcp_token_init(void); 7892c5ebd00SPaolo Abeni static inline void mptcp_token_init_request(struct request_sock *req) 7902c5ebd00SPaolo Abeni { 7912c5ebd00SPaolo Abeni mptcp_subflow_rsk(req)->token_node.pprev = NULL; 7922c5ebd00SPaolo Abeni } 7932c5ebd00SPaolo Abeni 79479c0949eSPeter Krystad int mptcp_token_new_request(struct request_sock *req); 7952c5ebd00SPaolo Abeni void mptcp_token_destroy_request(struct request_sock *req); 796294de909SMenglong Dong int mptcp_token_new_connect(struct sock *ssk); 7972c5ebd00SPaolo Abeni void mptcp_token_accept(struct mptcp_subflow_request_sock *r, 7982c5ebd00SPaolo Abeni struct mptcp_sock *msk); 799c83a47e5SFlorian Westphal bool mptcp_token_exists(u32 token); 800ea1300b9SFlorian Westphal struct mptcp_sock *mptcp_token_get_sock(struct net *net, u32 token); 80196d890daSPaolo Abeni struct mptcp_sock *mptcp_token_iter_next(const struct net *net, long *s_slot, 80296d890daSPaolo Abeni long *s_num); 8032c5ebd00SPaolo Abeni void mptcp_token_destroy(struct mptcp_sock *msk); 80479c0949eSPeter Krystad 80579c0949eSPeter Krystad void mptcp_crypto_key_sha(u64 key, u32 *token, u64 *idsn); 80679c0949eSPeter Krystad 8073df523abSPeter Krystad void mptcp_crypto_hmac_sha(u64 key1, u64 key2, u8 *msg, int len, void *hmac); 808ba2c89e0SPaolo Abeni __sum16 __mptcp_make_csum(u64 data_seq, u32 subflow_seq, u16 data_len, __wsum sum); 80979c0949eSPeter Krystad 810d39dcecaSPaolo Abeni void __init mptcp_pm_init(void); 8111b1c7a0eSPeter Krystad void mptcp_pm_data_init(struct mptcp_sock *msk); 812b29fcfb5SPaolo Abeni void mptcp_pm_data_reset(struct mptcp_sock *msk); 813702c2f64SFlorian Westphal int mptcp_pm_parse_addr(struct nlattr *attr, struct genl_info *info, 814702c2f64SFlorian Westphal struct mptcp_addr_info *addr); 8159ab4807cSKishen Maloor int mptcp_pm_parse_entry(struct nlattr *attr, struct genl_info *info, 8169ab4807cSKishen Maloor bool require_family, 8179ab4807cSKishen Maloor struct mptcp_pm_addr_entry *entry); 818fb00ee4fSMatthieu Baerts bool mptcp_pm_addr_families_match(const struct sock *sk, 819fb00ee4fSMatthieu Baerts const struct mptcp_addr_info *loc, 820fb00ee4fSMatthieu Baerts const struct mptcp_addr_info *rem); 82171b7dec2SPaolo Abeni void mptcp_pm_subflow_chk_stale(const struct mptcp_sock *msk, struct sock *ssk); 822ff5a0b42SPaolo Abeni void mptcp_pm_nl_subflow_chk_stale(const struct mptcp_sock *msk, struct sock *ssk); 8236c714f1bSFlorian Westphal void mptcp_pm_new_connection(struct mptcp_sock *msk, const struct sock *ssk, int server_side); 8247a486c44SPaolo Abeni void mptcp_pm_fully_established(struct mptcp_sock *msk, const struct sock *ssk); 8251b1c7a0eSPeter Krystad bool mptcp_pm_allow_new_subflow(struct mptcp_sock *msk); 8261b1c7a0eSPeter Krystad void mptcp_pm_connection_closed(struct mptcp_sock *msk); 82762535200SGeliang Tang void mptcp_pm_subflow_established(struct mptcp_sock *msk); 828a88c9e49SPaolo Abeni bool mptcp_pm_nl_check_work_pending(struct mptcp_sock *msk); 829a88c9e49SPaolo Abeni void mptcp_pm_subflow_check_next(struct mptcp_sock *msk, const struct sock *ssk, 830a88c9e49SPaolo Abeni const struct mptcp_subflow_context *subflow); 831d1ace2d9SKishen Maloor void mptcp_pm_add_addr_received(const struct sock *ssk, 8321b1c7a0eSPeter Krystad const struct mptcp_addr_info *addr); 833557963c3SGeliang Tang void mptcp_pm_add_addr_echoed(struct mptcp_sock *msk, 83490d93088SPaolo Abeni const struct mptcp_addr_info *addr); 83584dfe367SGeliang Tang void mptcp_pm_add_addr_send_ack(struct mptcp_sock *msk); 836b46a0238SGeliang Tang void mptcp_pm_nl_addr_send_ack(struct mptcp_sock *msk); 8375c4a824dSGeliang Tang void mptcp_pm_rm_addr_received(struct mptcp_sock *msk, 8385c4a824dSGeliang Tang const struct mptcp_rm_list *rm_list); 83940453a5cSGeliang Tang void mptcp_pm_mp_prio_received(struct sock *sk, u8 bkup); 8405580d41bSGeliang Tang void mptcp_pm_mp_fail_received(struct sock *sk, u64 fail_seq); 841892f396cSKishen Maloor int mptcp_pm_nl_mp_prio_send_ack(struct mptcp_sock *msk, 842892f396cSKishen Maloor struct mptcp_addr_info *addr, 843892f396cSKishen Maloor struct mptcp_addr_info *rem, 844892f396cSKishen Maloor u8 bkup); 8459ab4807cSKishen Maloor bool mptcp_pm_alloc_anno_list(struct mptcp_sock *msk, 846528cb5f2SGeliang Tang const struct mptcp_addr_info *addr); 847b6c08380SGeliang Tang void mptcp_pm_free_anno_list(struct mptcp_sock *msk); 8485bc56388SGeliang Tang bool mptcp_pm_sport_in_anno_list(struct mptcp_sock *msk, const struct sock *sk); 84900cfd77bSGeliang Tang struct mptcp_pm_add_entry * 85000cfd77bSGeliang Tang mptcp_pm_del_add_timer(struct mptcp_sock *msk, 85190d93088SPaolo Abeni const struct mptcp_addr_info *addr, bool check_id); 852d88c476fSGeliang Tang struct mptcp_pm_add_entry * 85390d93088SPaolo Abeni mptcp_lookup_anno_list_by_saddr(const struct mptcp_sock *msk, 85490d93088SPaolo Abeni const struct mptcp_addr_info *addr); 8558b201370SKishen Maloor int mptcp_pm_get_flags_and_ifindex_by_id(struct mptcp_sock *msk, 8568b201370SKishen Maloor unsigned int id, 8578b201370SKishen Maloor u8 *flags, int *ifindex); 858f40be0dbSGeliang Tang int mptcp_pm_nl_get_flags_and_ifindex_by_id(struct mptcp_sock *msk, unsigned int id, 859f40be0dbSGeliang Tang u8 *flags, int *ifindex); 8608b201370SKishen Maloor int mptcp_userspace_pm_get_flags_and_ifindex_by_id(struct mptcp_sock *msk, 8618b201370SKishen Maloor unsigned int id, 862ee285257SGeliang Tang u8 *flags, int *ifindex); 8636ba7ce89SGeliang Tang int mptcp_pm_set_flags(struct net *net, struct nlattr *token, 8646ba7ce89SGeliang Tang struct mptcp_pm_addr_entry *loc, 8656ba7ce89SGeliang Tang struct mptcp_pm_addr_entry *rem, u8 bkup); 8666ba7ce89SGeliang Tang int mptcp_pm_nl_set_flags(struct net *net, struct mptcp_pm_addr_entry *addr, u8 bkup); 867892f396cSKishen Maloor int mptcp_userspace_pm_set_flags(struct net *net, struct nlattr *token, 868892f396cSKishen Maloor struct mptcp_pm_addr_entry *loc, 869892f396cSKishen Maloor struct mptcp_pm_addr_entry *rem, u8 bkup); 8701b1c7a0eSPeter Krystad int mptcp_pm_announce_addr(struct mptcp_sock *msk, 8716a6c05a8SGeliang Tang const struct mptcp_addr_info *addr, 872f7efc777SGeliang Tang bool echo); 873cbde2787SGeliang Tang int mptcp_pm_remove_addr(struct mptcp_sock *msk, const struct mptcp_rm_list *rm_list); 874ddd14bb8SGeliang Tang int mptcp_pm_remove_subflow(struct mptcp_sock *msk, const struct mptcp_rm_list *rm_list); 8758b1c94daSGeliang Tang void mptcp_pm_remove_addrs(struct mptcp_sock *msk, struct list_head *rm_list); 876d9a4594eSKishen Maloor void mptcp_pm_remove_addrs_and_subflows(struct mptcp_sock *msk, 877d9a4594eSKishen Maloor struct list_head *rm_list); 878d9a4594eSKishen Maloor 8794638de5aSKishen Maloor void mptcp_free_local_addr_list(struct mptcp_sock *msk); 8809ab4807cSKishen Maloor int mptcp_nl_cmd_announce(struct sk_buff *skb, struct genl_info *info); 881d9a4594eSKishen Maloor int mptcp_nl_cmd_remove(struct sk_buff *skb, struct genl_info *info); 882702c2f64SFlorian Westphal int mptcp_nl_cmd_sf_create(struct sk_buff *skb, struct genl_info *info); 883702c2f64SFlorian Westphal int mptcp_nl_cmd_sf_destroy(struct sk_buff *skb, struct genl_info *info); 8841b1c7a0eSPeter Krystad 885b911c97cSFlorian Westphal void mptcp_event(enum mptcp_event_type type, const struct mptcp_sock *msk, 886b911c97cSFlorian Westphal const struct sock *ssk, gfp_t gfp); 887d1ace2d9SKishen Maloor void mptcp_event_addr_announced(const struct sock *ssk, const struct mptcp_addr_info *info); 888b911c97cSFlorian Westphal void mptcp_event_addr_removed(const struct mptcp_sock *msk, u8 id); 889f8c9dfbdSGeliang Tang void mptcp_event_pm_listener(const struct sock *ssk, 890f8c9dfbdSGeliang Tang enum mptcp_event_type event); 8914d25247dSKishen Maloor bool mptcp_userspace_pm_active(const struct mptcp_sock *msk); 892b911c97cSFlorian Westphal 893dfc8d060SDmytro Shytyi void mptcp_fastopen_gen_msk_ackseq(struct mptcp_sock *msk, struct mptcp_subflow_context *subflow, 894dfc8d060SDmytro Shytyi const struct mptcp_options_received *mp_opt); 89536b122baSDmytro Shytyi void mptcp_fastopen_subflow_synack_set_params(struct mptcp_subflow_context *subflow, 89636b122baSDmytro Shytyi struct request_sock *req); 897dfc8d060SDmytro Shytyi 898f643b803SGeliang Tang static inline bool mptcp_pm_should_add_signal(struct mptcp_sock *msk) 8991b1c7a0eSPeter Krystad { 90018fc1a92SYonglong Li return READ_ONCE(msk->pm.addr_signal) & 90118fc1a92SYonglong Li (BIT(MPTCP_ADD_ADDR_SIGNAL) | BIT(MPTCP_ADD_ADDR_ECHO)); 90218fc1a92SYonglong Li } 90318fc1a92SYonglong Li 90418fc1a92SYonglong Li static inline bool mptcp_pm_should_add_signal_addr(struct mptcp_sock *msk) 90518fc1a92SYonglong Li { 90613ad9f01SGeliang Tang return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_SIGNAL); 907d91d322aSGeliang Tang } 908d91d322aSGeliang Tang 909d91d322aSGeliang Tang static inline bool mptcp_pm_should_add_signal_echo(struct mptcp_sock *msk) 910d91d322aSGeliang Tang { 91113ad9f01SGeliang Tang return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_ECHO); 9121b1c7a0eSPeter Krystad } 9131b1c7a0eSPeter Krystad 9145cb104aeSGeliang Tang static inline bool mptcp_pm_should_rm_signal(struct mptcp_sock *msk) 9155cb104aeSGeliang Tang { 91613ad9f01SGeliang Tang return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_RM_ADDR_SIGNAL); 9175cb104aeSGeliang Tang } 9185cb104aeSGeliang Tang 91914b06811SMat Martineau static inline bool mptcp_pm_is_userspace(const struct mptcp_sock *msk) 92014b06811SMat Martineau { 92114b06811SMat Martineau return READ_ONCE(msk->pm.pm_type) == MPTCP_PM_TYPE_USERSPACE; 92214b06811SMat Martineau } 92314b06811SMat Martineau 9244d25247dSKishen Maloor static inline bool mptcp_pm_is_kernel(const struct mptcp_sock *msk) 9254d25247dSKishen Maloor { 9264d25247dSKishen Maloor return READ_ONCE(msk->pm.pm_type) == MPTCP_PM_TYPE_KERNEL; 9274d25247dSKishen Maloor } 9284d25247dSKishen Maloor 9294a2777a8SGeliang Tang static inline unsigned int mptcp_add_addr_len(int family, bool echo, bool port) 9301b1c7a0eSPeter Krystad { 9312ec72faeSGeliang Tang u8 len = TCPOLEN_MPTCP_ADD_ADDR_BASE; 9322ec72faeSGeliang Tang 9332ec72faeSGeliang Tang if (family == AF_INET6) 9342ec72faeSGeliang Tang len = TCPOLEN_MPTCP_ADD_ADDR6_BASE; 9352ec72faeSGeliang Tang if (!echo) 9362ec72faeSGeliang Tang len += MPTCPOPT_THMAC_LEN; 93727ab92d9SDavide Caratti /* account for 2 trailing 'nop' options */ 9384a2777a8SGeliang Tang if (port) 93927ab92d9SDavide Caratti len += TCPOLEN_MPTCP_PORT_LEN + TCPOLEN_MPTCP_PORT_ALIGN; 9402ec72faeSGeliang Tang 9412ec72faeSGeliang Tang return len; 9421b1c7a0eSPeter Krystad } 9431b1c7a0eSPeter Krystad 9446445e17aSGeliang Tang static inline int mptcp_rm_addr_len(const struct mptcp_rm_list *rm_list) 9456445e17aSGeliang Tang { 9466445e17aSGeliang Tang if (rm_list->nr == 0 || rm_list->nr > MPTCP_RM_IDS_MAX) 9476445e17aSGeliang Tang return -EINVAL; 9486445e17aSGeliang Tang 9496445e17aSGeliang Tang return TCPOLEN_MPTCP_RM_ADDR_BASE + roundup(rm_list->nr - 1, 4) + 1; 9506445e17aSGeliang Tang } 9516445e17aSGeliang Tang 95290d93088SPaolo Abeni bool mptcp_pm_add_addr_signal(struct mptcp_sock *msk, const struct sk_buff *skb, 9531f5e9e2fSYonglong Li unsigned int opt_size, unsigned int remaining, 954f462a446SYonglong Li struct mptcp_addr_info *addr, bool *echo, 955af7939f3SGeliang Tang bool *drop_other_suboptions); 9565cb104aeSGeliang Tang bool mptcp_pm_rm_addr_signal(struct mptcp_sock *msk, unsigned int remaining, 9576445e17aSGeliang Tang struct mptcp_rm_list *rm_list); 9581b1c7a0eSPeter Krystad int mptcp_pm_get_local_id(struct mptcp_sock *msk, struct sock_common *skc); 9599bbec87eSGeliang Tang int mptcp_pm_nl_get_local_id(struct mptcp_sock *msk, struct mptcp_addr_info *skc); 9608b201370SKishen Maloor int mptcp_userspace_pm_get_local_id(struct mptcp_sock *msk, struct mptcp_addr_info *skc); 9611b1c7a0eSPeter Krystad 962d39dcecaSPaolo Abeni void __init mptcp_pm_nl_init(void); 963e9801430SFlorian Westphal void mptcp_pm_nl_work(struct mptcp_sock *msk); 964ddd14bb8SGeliang Tang void mptcp_pm_nl_rm_subflow_received(struct mptcp_sock *msk, 965ddd14bb8SGeliang Tang const struct mptcp_rm_list *rm_list); 96690d93088SPaolo Abeni unsigned int mptcp_pm_get_add_addr_signal_max(const struct mptcp_sock *msk); 96790d93088SPaolo Abeni unsigned int mptcp_pm_get_add_addr_accept_max(const struct mptcp_sock *msk); 96890d93088SPaolo Abeni unsigned int mptcp_pm_get_subflows_max(const struct mptcp_sock *msk); 96990d93088SPaolo Abeni unsigned int mptcp_pm_get_local_addr_max(const struct mptcp_sock *msk); 97001cacb00SPaolo Abeni 97195d68651SPaolo Abeni /* called under PM lock */ 97295d68651SPaolo Abeni static inline void __mptcp_pm_close_subflow(struct mptcp_sock *msk) 97395d68651SPaolo Abeni { 97495d68651SPaolo Abeni if (--msk->pm.subflows < mptcp_pm_get_subflows_max(msk)) 97595d68651SPaolo Abeni WRITE_ONCE(msk->pm.accept_subflow, true); 97695d68651SPaolo Abeni } 97795d68651SPaolo Abeni 97895d68651SPaolo Abeni static inline void mptcp_pm_close_subflow(struct mptcp_sock *msk) 97995d68651SPaolo Abeni { 98095d68651SPaolo Abeni spin_lock_bh(&msk->pm.lock); 98195d68651SPaolo Abeni __mptcp_pm_close_subflow(msk); 98295d68651SPaolo Abeni spin_unlock_bh(&msk->pm.lock); 98395d68651SPaolo Abeni } 98495d68651SPaolo Abeni 98578962489SFlorian Westphal void mptcp_sockopt_sync(struct mptcp_sock *msk, struct sock *ssk); 9863e501490SPaolo Abeni void mptcp_sockopt_sync_locked(struct mptcp_sock *msk, struct sock *ssk); 98778962489SFlorian Westphal 988dc87efdbSFlorian Westphal static inline struct mptcp_ext *mptcp_get_ext(const struct sk_buff *skb) 9896d0060f6SMat Martineau { 9906d0060f6SMat Martineau return (struct mptcp_ext *)skb_ext_find(skb, SKB_EXT_MPTCP); 9916d0060f6SMat Martineau } 9926d0060f6SMat Martineau 9935147dfb5SDavide Caratti void mptcp_diag_subflow_init(struct tcp_ulp_ops *ops); 9945147dfb5SDavide Caratti 995d5f49190SPaolo Abeni static inline bool __mptcp_check_fallback(const struct mptcp_sock *msk) 996e1ff9e82SDavide Caratti { 997e1ff9e82SDavide Caratti return test_bit(MPTCP_FALLBACK_DONE, &msk->flags); 998e1ff9e82SDavide Caratti } 999e1ff9e82SDavide Caratti 1000d5f49190SPaolo Abeni static inline bool mptcp_check_fallback(const struct sock *sk) 1001e1ff9e82SDavide Caratti { 1002e1ff9e82SDavide Caratti struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); 1003e1ff9e82SDavide Caratti struct mptcp_sock *msk = mptcp_sk(subflow->conn); 1004e1ff9e82SDavide Caratti 1005e1ff9e82SDavide Caratti return __mptcp_check_fallback(msk); 1006e1ff9e82SDavide Caratti } 1007e1ff9e82SDavide Caratti 1008e1ff9e82SDavide Caratti static inline void __mptcp_do_fallback(struct mptcp_sock *msk) 1009e1ff9e82SDavide Caratti { 1010e1ff9e82SDavide Caratti if (test_bit(MPTCP_FALLBACK_DONE, &msk->flags)) { 1011e1ff9e82SDavide Caratti pr_debug("TCP fallback already done (msk=%p)", msk); 1012e1ff9e82SDavide Caratti return; 1013e1ff9e82SDavide Caratti } 1014e1ff9e82SDavide Caratti set_bit(MPTCP_FALLBACK_DONE, &msk->flags); 1015e1ff9e82SDavide Caratti } 1016e1ff9e82SDavide Caratti 1017d51991e2SPaolo Abeni static inline void mptcp_do_fallback(struct sock *ssk) 1018e1ff9e82SDavide Caratti { 1019d51991e2SPaolo Abeni struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); 1020d51991e2SPaolo Abeni struct sock *sk = subflow->conn; 1021d51991e2SPaolo Abeni struct mptcp_sock *msk; 1022e1ff9e82SDavide Caratti 1023d51991e2SPaolo Abeni msk = mptcp_sk(sk); 1024e1ff9e82SDavide Caratti __mptcp_do_fallback(msk); 1025d51991e2SPaolo Abeni if (READ_ONCE(msk->snd_data_fin_enable) && !(ssk->sk_shutdown & SEND_SHUTDOWN)) { 1026d51991e2SPaolo Abeni gfp_t saved_allocation = ssk->sk_allocation; 1027d51991e2SPaolo Abeni 1028d51991e2SPaolo Abeni /* we are in a atomic (BH) scope, override ssk default for data 1029d51991e2SPaolo Abeni * fin allocation 1030d51991e2SPaolo Abeni */ 1031d51991e2SPaolo Abeni ssk->sk_allocation = GFP_ATOMIC; 1032d51991e2SPaolo Abeni ssk->sk_shutdown |= SEND_SHUTDOWN; 1033d51991e2SPaolo Abeni tcp_shutdown(ssk, SEND_SHUTDOWN); 1034d51991e2SPaolo Abeni ssk->sk_allocation = saved_allocation; 1035d51991e2SPaolo Abeni } 1036e1ff9e82SDavide Caratti } 1037e1ff9e82SDavide Caratti 1038e1ff9e82SDavide Caratti #define pr_fallback(a) pr_debug("%s:fallback to TCP (msk=%p)", __func__, a) 1039e1ff9e82SDavide Caratti 10401e39e5a3SGeliang Tang static inline bool mptcp_check_infinite_map(struct sk_buff *skb) 10411e39e5a3SGeliang Tang { 10421e39e5a3SGeliang Tang struct mptcp_ext *mpext; 10431e39e5a3SGeliang Tang 10441e39e5a3SGeliang Tang mpext = skb ? mptcp_get_ext(skb) : NULL; 10451e39e5a3SGeliang Tang if (mpext && mpext->infinite_map) 10461e39e5a3SGeliang Tang return true; 10471e39e5a3SGeliang Tang 10481e39e5a3SGeliang Tang return false; 10491e39e5a3SGeliang Tang } 10501e39e5a3SGeliang Tang 105170c708e8SKishen Maloor static inline bool is_active_ssk(struct mptcp_subflow_context *subflow) 105270c708e8SKishen Maloor { 105370c708e8SKishen Maloor return (subflow->request_mptcp || subflow->request_join); 105470c708e8SKishen Maloor } 105570c708e8SKishen Maloor 10568fd73804SDavide Caratti static inline bool subflow_simultaneous_connect(struct sock *sk) 10578fd73804SDavide Caratti { 10588fd73804SDavide Caratti struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); 10598fd73804SDavide Caratti 10608fd73804SDavide Caratti return sk->sk_state == TCP_ESTABLISHED && 106170c708e8SKishen Maloor is_active_ssk(subflow) && 10628fd73804SDavide Caratti !subflow->conn_finished; 10638fd73804SDavide Caratti } 10648fd73804SDavide Caratti 10659466a1ccSFlorian Westphal #ifdef CONFIG_SYN_COOKIES 10669466a1ccSFlorian Westphal void subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req, 10679466a1ccSFlorian Westphal struct sk_buff *skb); 10689466a1ccSFlorian Westphal bool mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req, 10699466a1ccSFlorian Westphal struct sk_buff *skb); 10709466a1ccSFlorian Westphal void __init mptcp_join_cookie_init(void); 10719466a1ccSFlorian Westphal #else 10729466a1ccSFlorian Westphal static inline void 10739466a1ccSFlorian Westphal subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req, 10749466a1ccSFlorian Westphal struct sk_buff *skb) {} 10759466a1ccSFlorian Westphal static inline bool 10769466a1ccSFlorian Westphal mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req, 10779466a1ccSFlorian Westphal struct sk_buff *skb) 10789466a1ccSFlorian Westphal { 10799466a1ccSFlorian Westphal return false; 10809466a1ccSFlorian Westphal } 10819466a1ccSFlorian Westphal 10829466a1ccSFlorian Westphal static inline void mptcp_join_cookie_init(void) {} 10839466a1ccSFlorian Westphal #endif 10849466a1ccSFlorian Westphal 1085f870fa0bSMat Martineau #endif /* __MPTCP_PROTOCOL_H */ 1086