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 11659832e24SFlorian Westphal #define MPTCP_WORK_EOF 3 117e1ff9e82SDavide Caratti #define MPTCP_FALLBACK_DONE 4 1180e4f35d7SPaolo Abeni #define MPTCP_WORK_CLOSE_SUBFLOW 5 119e9d09bacSPaolo Abeni 120e9d09bacSPaolo Abeni /* MPTCP socket release cb flags */ 121e9d09bacSPaolo Abeni #define MPTCP_PUSH_PENDING 1 122e9d09bacSPaolo Abeni #define MPTCP_CLEAN_UNA 2 123e9d09bacSPaolo Abeni #define MPTCP_ERROR_REPORT 3 124e9d09bacSPaolo Abeni #define MPTCP_RETRANSMIT 4 125e9d09bacSPaolo Abeni #define MPTCP_FLUSH_JOIN_LIST 5 126e9d09bacSPaolo Abeni #define MPTCP_CONNECTED 6 12743f5b111SPaolo Abeni #define MPTCP_RESET_SCHEDULER 7 1286d0060f6SMat Martineau 129dfc8d060SDmytro Shytyi struct mptcp_skb_cb { 130dfc8d060SDmytro Shytyi u64 map_seq; 131dfc8d060SDmytro Shytyi u64 end_seq; 132dfc8d060SDmytro Shytyi u32 offset; 133dfc8d060SDmytro Shytyi u8 has_rxtstamp:1; 134dfc8d060SDmytro Shytyi }; 135dfc8d060SDmytro Shytyi 136dfc8d060SDmytro Shytyi #define MPTCP_SKB_CB(__skb) ((struct mptcp_skb_cb *)&((__skb)->cb[0])) 137dfc8d060SDmytro Shytyi 138eaa2ffabSPaolo Abeni static inline bool before64(__u64 seq1, __u64 seq2) 139eaa2ffabSPaolo Abeni { 140eaa2ffabSPaolo Abeni return (__s64)(seq1 - seq2) < 0; 141eaa2ffabSPaolo Abeni } 142eaa2ffabSPaolo Abeni 143eaa2ffabSPaolo Abeni #define after64(seq2, seq1) before64(seq1, seq2) 144eaa2ffabSPaolo Abeni 145cfde141eSPaolo Abeni struct mptcp_options_received { 146cfde141eSPaolo Abeni u64 sndr_key; 147cfde141eSPaolo Abeni u64 rcvr_key; 148cfde141eSPaolo Abeni u64 data_ack; 149cfde141eSPaolo Abeni u64 data_seq; 150cfde141eSPaolo Abeni u32 subflow_seq; 151cfde141eSPaolo Abeni u16 data_len; 152208e8f66SGeliang Tang __sum16 csum; 15374c7dfbeSPaolo Abeni u16 suboptions; 154cfde141eSPaolo Abeni u32 token; 155cfde141eSPaolo Abeni u32 nonce; 156a086aebaSPaolo Abeni u16 use_map:1, 157cfde141eSPaolo Abeni dsn64:1, 158cfde141eSPaolo Abeni data_fin:1, 159cfde141eSPaolo Abeni use_ack:1, 160cfde141eSPaolo Abeni ack64:1, 161cfde141eSPaolo Abeni mpc_map:1, 162a086aebaSPaolo Abeni reset_reason:4, 163a086aebaSPaolo Abeni reset_transient:1, 164a086aebaSPaolo Abeni echo:1, 165a086aebaSPaolo Abeni backup:1, 166a086aebaSPaolo Abeni deny_join_id0:1, 167cfde141eSPaolo Abeni __unused:2; 168a086aebaSPaolo Abeni u8 join_id; 169a086aebaSPaolo Abeni u64 thmac; 170a086aebaSPaolo Abeni u8 hmac[MPTCPOPT_HMAC_LEN]; 171f7dafee1SGeliang Tang struct mptcp_addr_info addr; 1725c4a824dSGeliang Tang struct mptcp_rm_list rm_list; 173cfde141eSPaolo Abeni u64 ahmac; 1745580d41bSGeliang Tang u64 fail_seq; 175cfde141eSPaolo Abeni }; 176cfde141eSPaolo Abeni 1773df523abSPeter Krystad static inline __be32 mptcp_option(u8 subopt, u8 len, u8 nib, u8 field) 1783df523abSPeter Krystad { 1793df523abSPeter Krystad return htonl((TCPOPT_MPTCP << 24) | (len << 16) | (subopt << 12) | 1803df523abSPeter Krystad ((nib & 0xF) << 8) | field); 1813df523abSPeter Krystad } 1823df523abSPeter Krystad 1831b1c7a0eSPeter Krystad enum mptcp_pm_status { 1841b1c7a0eSPeter Krystad MPTCP_PM_ADD_ADDR_RECEIVED, 18584dfe367SGeliang Tang MPTCP_PM_ADD_ADDR_SEND_ACK, 186d0876b22SGeliang Tang MPTCP_PM_RM_ADDR_RECEIVED, 1871b1c7a0eSPeter Krystad MPTCP_PM_ESTABLISHED, 1881b1c7a0eSPeter Krystad MPTCP_PM_SUBFLOW_ESTABLISHED, 18986e39e04SPaolo Abeni MPTCP_PM_ALREADY_ESTABLISHED, /* persistent status, set after ESTABLISHED event */ 19086e39e04SPaolo Abeni MPTCP_PM_MPC_ENDPOINT_ACCOUNTED /* persistent status, set after MPC local address is 19186e39e04SPaolo Abeni * accounted int id_avail_bitmap 19286e39e04SPaolo Abeni */ 1931b1c7a0eSPeter Krystad }; 1941b1c7a0eSPeter Krystad 195d85a8fdeSMat Martineau enum mptcp_pm_type { 196d85a8fdeSMat Martineau MPTCP_PM_TYPE_KERNEL = 0, 197d85a8fdeSMat Martineau MPTCP_PM_TYPE_USERSPACE, 198d85a8fdeSMat Martineau 199d85a8fdeSMat Martineau __MPTCP_PM_TYPE_NR, 200d85a8fdeSMat Martineau __MPTCP_PM_TYPE_MAX = __MPTCP_PM_TYPE_NR - 1, 201d85a8fdeSMat Martineau }; 202d85a8fdeSMat Martineau 20386e39e04SPaolo Abeni /* Status bits below MPTCP_PM_ALREADY_ESTABLISHED need pm worker actions */ 20486e39e04SPaolo Abeni #define MPTCP_PM_WORK_MASK ((1 << MPTCP_PM_ALREADY_ESTABLISHED) - 1) 20586e39e04SPaolo Abeni 20613ad9f01SGeliang Tang enum mptcp_addr_signal_status { 207d91d322aSGeliang Tang MPTCP_ADD_ADDR_SIGNAL, 208d91d322aSGeliang Tang MPTCP_ADD_ADDR_ECHO, 20942842a42SGeliang Tang MPTCP_RM_ADDR_SIGNAL, 210d91d322aSGeliang Tang }; 211d91d322aSGeliang Tang 21286e39e04SPaolo Abeni /* max value of mptcp_addr_info.id */ 21386e39e04SPaolo Abeni #define MPTCP_PM_MAX_ADDR_ID U8_MAX 21486e39e04SPaolo Abeni 2151b1c7a0eSPeter Krystad struct mptcp_pm_data { 2161b1c7a0eSPeter Krystad struct mptcp_addr_info local; 2171b1c7a0eSPeter Krystad struct mptcp_addr_info remote; 218b6c08380SGeliang Tang struct list_head anno_list; 2194638de5aSKishen Maloor struct list_head userspace_pm_local_addr_list; 2201b1c7a0eSPeter Krystad 2211b1c7a0eSPeter Krystad spinlock_t lock; /*protects the whole PM data */ 2221b1c7a0eSPeter Krystad 22313ad9f01SGeliang Tang u8 addr_signal; 2241b1c7a0eSPeter Krystad bool server_side; 2251b1c7a0eSPeter Krystad bool work_pending; 2261b1c7a0eSPeter Krystad bool accept_addr; 2271b1c7a0eSPeter Krystad bool accept_subflow; 228df377be3SGeliang Tang bool remote_deny_join_id0; 2291b1c7a0eSPeter Krystad u8 add_addr_signaled; 2301b1c7a0eSPeter Krystad u8 add_addr_accepted; 2311b1c7a0eSPeter Krystad u8 local_addr_used; 232d85a8fdeSMat Martineau u8 pm_type; 2331b1c7a0eSPeter Krystad u8 subflows; 2341b1c7a0eSPeter Krystad u8 status; 23586e39e04SPaolo Abeni DECLARE_BITMAP(id_avail_bitmap, MPTCP_PM_MAX_ADDR_ID + 1); 236cbde2787SGeliang Tang struct mptcp_rm_list rm_list_tx; 237b5c55f33SGeliang Tang struct mptcp_rm_list rm_list_rx; 2381b1c7a0eSPeter Krystad }; 2391b1c7a0eSPeter Krystad 2404638de5aSKishen Maloor struct mptcp_pm_addr_entry { 2414638de5aSKishen Maloor struct list_head list; 2424638de5aSKishen Maloor struct mptcp_addr_info addr; 2434638de5aSKishen Maloor u8 flags; 2444638de5aSKishen Maloor int ifindex; 2454638de5aSKishen Maloor struct socket *lsk; 2464638de5aSKishen Maloor }; 2474638de5aSKishen Maloor 24818b683bfSPaolo Abeni struct mptcp_data_frag { 24918b683bfSPaolo Abeni struct list_head list; 25018b683bfSPaolo Abeni u64 data_seq; 251f0e6a4cfSPaolo Abeni u16 data_len; 252f0e6a4cfSPaolo Abeni u16 offset; 253f0e6a4cfSPaolo Abeni u16 overhead; 254f0e6a4cfSPaolo Abeni u16 already_sent; 25518b683bfSPaolo Abeni struct page *page; 25618b683bfSPaolo Abeni }; 25718b683bfSPaolo Abeni 258f870fa0bSMat Martineau /* MPTCP connection sock */ 259f870fa0bSMat Martineau struct mptcp_sock { 260f870fa0bSMat Martineau /* inet_connection_sock must be the first member */ 261f870fa0bSMat Martineau struct inet_connection_sock sk; 262cec37a6eSPeter Krystad u64 local_key; 263cec37a6eSPeter Krystad u64 remote_key; 2646d0060f6SMat Martineau u64 write_seq; 26538967f42SPaolo Abeni u64 bytes_sent; 266eaa2ffabSPaolo Abeni u64 snd_nxt; 26738967f42SPaolo Abeni u64 bytes_received; 2686d0060f6SMat Martineau u64 ack_seq; 269f3589be0SPaolo Abeni atomic64_t rcv_wnd_sent; 2703721b9b6SMat Martineau u64 rcv_data_fin_seq; 27138967f42SPaolo Abeni u64 bytes_retrans; 2726511882cSPaolo Abeni int rmem_fwd_alloc; 273d5f49190SPaolo Abeni struct sock *last_snd; 274d5f49190SPaolo Abeni int snd_burst; 275ea4ca586SPaolo Abeni int old_wspace; 2761e1d9d6fSPaolo Abeni u64 recovery_snd_nxt; /* in recovery mode accept up to this seq; 2771e1d9d6fSPaolo Abeni * recovery related fields are under data_lock 2781e1d9d6fSPaolo Abeni * protection 2791e1d9d6fSPaolo Abeni */ 28038967f42SPaolo Abeni u64 bytes_acked; 2817439d687SPaolo Abeni u64 snd_una; 2827439d687SPaolo Abeni u64 wnd_end; 283b51f9b80SPaolo Abeni unsigned long timer_ival; 28479c0949eSPeter Krystad u32 token; 28587952603SPaolo Abeni int rmem_released; 286648ef4b8SMat Martineau unsigned long flags; 287e9d09bacSPaolo Abeni unsigned long cb_flags; 288e9d09bacSPaolo Abeni unsigned long push_pending; 2891e1d9d6fSPaolo Abeni bool recovery; /* closing subflow write queue reinjected */ 290d22f4988SChristoph Paasch bool can_ack; 291b93df08cSPaolo Abeni bool fully_established; 2923721b9b6SMat Martineau bool rcv_data_fin; 2937279da61SMat Martineau bool snd_data_fin_enable; 29450c504a2SFlorian Westphal bool rcv_fastclose; 29537198e93SDavide Caratti bool use_64bit_ack; /* Set when we received a 64-bit DSN */ 296752e9067SGeliang Tang bool csum_enabled; 2970530020aSGeliang Tang bool allow_infinite_fallback; 2983ad14f54SPaolo Abeni u8 mpc_endpoint_id; 2994f6e14bdSMaxim Galaganov u8 recvmsg_inq:1, 3004f6e14bdSMaxim Galaganov cork:1, 30154f1944eSPaolo Abeni nodelay:1, 302b6985b9bSPaolo Abeni fastopening:1, 303b6985b9bSPaolo Abeni in_accept_queue:1; 30480992017SPaolo Abeni struct work_struct work; 305ab174ad8SPaolo Abeni struct sk_buff *ooo_last_skb; 306ab174ad8SPaolo Abeni struct rb_root out_of_order_queue; 30787952603SPaolo Abeni struct sk_buff_head receive_queue; 308cec37a6eSPeter Krystad struct list_head conn_list; 30918b683bfSPaolo Abeni struct list_head rtx_queue; 310f0e6a4cfSPaolo Abeni struct mptcp_data_frag *first_pending; 311ec3edaa7SPeter Krystad struct list_head join_list; 3125b825727SPaolo Abeni struct socket *subflow; /* outgoing connect/listener/!mp_capable 3135b825727SPaolo Abeni * The mptcp ops can safely dereference, using suitable 3145b825727SPaolo Abeni * ONCE annotation, the subflow outside the socket 3155b825727SPaolo Abeni * lock as such sock is freed after close(). 3165b825727SPaolo Abeni */ 3178ab183deSPaolo Abeni struct sock *first; 3181b1c7a0eSPeter Krystad struct mptcp_pm_data pm; 319a6b118feSFlorian Westphal struct { 320a6b118feSFlorian Westphal u32 space; /* bytes copied in last measurement window */ 321a6b118feSFlorian Westphal u32 copied; /* bytes copied in this measurement window */ 322a6b118feSFlorian Westphal u64 time; /* start time of measurement window */ 323a6b118feSFlorian Westphal u64 rtt_us; /* last maximum rtt of subflows */ 324a6b118feSFlorian Westphal } rcvq_space; 325df00b087SFlorian Westphal 3266f06b4d4SPaolo Abeni u32 subflow_id; 327df00b087SFlorian Westphal u32 setsockopt_seq; 32820b5759fSPaolo Abeni char ca_name[TCP_CA_NAME_MAX]; 3296aeed904SPaolo Abeni struct mptcp_sock *dl_next; 330f870fa0bSMat Martineau }; 331f870fa0bSMat Martineau 33287952603SPaolo Abeni #define mptcp_data_lock(sk) spin_lock_bh(&(sk)->sk_lock.slock) 33387952603SPaolo Abeni #define mptcp_data_unlock(sk) spin_unlock_bh(&(sk)->sk_lock.slock) 33487952603SPaolo Abeni 335cec37a6eSPeter Krystad #define mptcp_for_each_subflow(__msk, __subflow) \ 336cec37a6eSPeter Krystad list_for_each_entry(__subflow, &((__msk)->conn_list), node) 3375efbf6f7SMatthieu Baerts #define mptcp_for_each_subflow_safe(__msk, __subflow, __tmp) \ 3385efbf6f7SMatthieu Baerts list_for_each_entry_safe(__subflow, __tmp, &((__msk)->conn_list), node) 339cec37a6eSPeter Krystad 3403abc05d9SFlorian Westphal static inline void msk_owned_by_me(const struct mptcp_sock *msk) 3413abc05d9SFlorian Westphal { 3423abc05d9SFlorian Westphal sock_owned_by_me((const struct sock *)msk); 3433abc05d9SFlorian Westphal } 3443abc05d9SFlorian Westphal 345403a40f2SEric Dumazet #define mptcp_sk(ptr) container_of_const(ptr, struct mptcp_sock, sk.icsk_inet.sk) 346f870fa0bSMat Martineau 347ce599c51SPaolo Abeni /* the msk socket don't use the backlog, also account for the bulk 348ce599c51SPaolo Abeni * free memory 349ce599c51SPaolo Abeni */ 350ce599c51SPaolo Abeni static inline int __mptcp_rmem(const struct sock *sk) 351ce599c51SPaolo Abeni { 352ce599c51SPaolo Abeni return atomic_read(&sk->sk_rmem_alloc) - READ_ONCE(mptcp_sk(sk)->rmem_released); 353ce599c51SPaolo Abeni } 354ce599c51SPaolo Abeni 355ea4ca586SPaolo Abeni static inline int __mptcp_space(const struct sock *sk) 356ea4ca586SPaolo Abeni { 357ce599c51SPaolo Abeni return tcp_win_from_space(sk, READ_ONCE(sk->sk_rcvbuf) - __mptcp_rmem(sk)); 358ea4ca586SPaolo Abeni } 359ea4ca586SPaolo Abeni 360f0e6a4cfSPaolo Abeni static inline struct mptcp_data_frag *mptcp_send_head(const struct sock *sk) 361f0e6a4cfSPaolo Abeni { 362f0e6a4cfSPaolo Abeni const struct mptcp_sock *msk = mptcp_sk(sk); 363f0e6a4cfSPaolo Abeni 364f0e6a4cfSPaolo Abeni return READ_ONCE(msk->first_pending); 365f0e6a4cfSPaolo Abeni } 366f0e6a4cfSPaolo Abeni 367f0e6a4cfSPaolo Abeni static inline struct mptcp_data_frag *mptcp_send_next(struct sock *sk) 368f0e6a4cfSPaolo Abeni { 369f0e6a4cfSPaolo Abeni struct mptcp_sock *msk = mptcp_sk(sk); 370f0e6a4cfSPaolo Abeni struct mptcp_data_frag *cur; 371f0e6a4cfSPaolo Abeni 372f0e6a4cfSPaolo Abeni cur = msk->first_pending; 373f0e6a4cfSPaolo Abeni return list_is_last(&cur->list, &msk->rtx_queue) ? NULL : 374f0e6a4cfSPaolo Abeni list_next_entry(cur, list); 375f0e6a4cfSPaolo Abeni } 376f0e6a4cfSPaolo Abeni 377f0e6a4cfSPaolo Abeni static inline struct mptcp_data_frag *mptcp_pending_tail(const struct sock *sk) 378f0e6a4cfSPaolo Abeni { 379403a40f2SEric Dumazet const struct mptcp_sock *msk = mptcp_sk(sk); 380f0e6a4cfSPaolo Abeni 381f0e6a4cfSPaolo Abeni if (!msk->first_pending) 382f0e6a4cfSPaolo Abeni return NULL; 383f0e6a4cfSPaolo Abeni 384f0e6a4cfSPaolo Abeni if (WARN_ON_ONCE(list_empty(&msk->rtx_queue))) 385f0e6a4cfSPaolo Abeni return NULL; 386f0e6a4cfSPaolo Abeni 387f0e6a4cfSPaolo Abeni return list_last_entry(&msk->rtx_queue, struct mptcp_data_frag, list); 388f0e6a4cfSPaolo Abeni } 389f0e6a4cfSPaolo Abeni 390403a40f2SEric Dumazet static inline struct mptcp_data_frag *mptcp_rtx_head(struct sock *sk) 3917948f6ccSFlorian Westphal { 3927948f6ccSFlorian Westphal struct mptcp_sock *msk = mptcp_sk(sk); 3937948f6ccSFlorian Westphal 39464b9cea7SPaolo Abeni if (msk->snd_una == READ_ONCE(msk->snd_nxt)) 39564b9cea7SPaolo Abeni return NULL; 39664b9cea7SPaolo Abeni 397a386bc5bSGeliang Tang return list_first_entry_or_null(&msk->rtx_queue, struct mptcp_data_frag, list); 3987948f6ccSFlorian Westphal } 3997948f6ccSFlorian Westphal 400d0cc2987SGeliang Tang struct csum_pseudo_header { 401d0cc2987SGeliang Tang __be64 data_seq; 402d0cc2987SGeliang Tang __be32 subflow_seq; 403d0cc2987SGeliang Tang __be16 data_len; 404d0cc2987SGeliang Tang __sum16 csum; 405d0cc2987SGeliang Tang }; 406d0cc2987SGeliang Tang 407cec37a6eSPeter Krystad struct mptcp_subflow_request_sock { 408cec37a6eSPeter Krystad struct tcp_request_sock sk; 409d22f4988SChristoph Paasch u16 mp_capable : 1, 410cec37a6eSPeter Krystad mp_join : 1, 41106fe1719SGeliang Tang backup : 1, 412bab6b88eSGeliang Tang csum_reqd : 1, 413bab6b88eSGeliang Tang allow_join_id0 : 1; 4141b1c7a0eSPeter Krystad u8 local_id; 415f296234cSPeter Krystad u8 remote_id; 416cec37a6eSPeter Krystad u64 local_key; 41779c0949eSPeter Krystad u64 idsn; 41879c0949eSPeter Krystad u32 token; 419648ef4b8SMat Martineau u32 ssn_offset; 420f296234cSPeter Krystad u64 thmac; 421f296234cSPeter Krystad u32 local_nonce; 422f296234cSPeter Krystad u32 remote_nonce; 4238fd4de12SPaolo Abeni struct mptcp_sock *msk; 4242c5ebd00SPaolo Abeni struct hlist_nulls_node token_node; 425cec37a6eSPeter Krystad }; 426cec37a6eSPeter Krystad 427cec37a6eSPeter Krystad static inline struct mptcp_subflow_request_sock * 428cec37a6eSPeter Krystad mptcp_subflow_rsk(const struct request_sock *rsk) 429cec37a6eSPeter Krystad { 430cec37a6eSPeter Krystad return (struct mptcp_subflow_request_sock *)rsk; 431cec37a6eSPeter Krystad } 432cec37a6eSPeter Krystad 4336719331cSPaolo Abeni enum mptcp_data_avail { 4346719331cSPaolo Abeni MPTCP_SUBFLOW_NODATA, 4356719331cSPaolo Abeni MPTCP_SUBFLOW_DATA_AVAIL, 4366719331cSPaolo Abeni }; 4376719331cSPaolo Abeni 438b19bc294SPaolo Abeni struct mptcp_delegated_action { 439b19bc294SPaolo Abeni struct napi_struct napi; 440b19bc294SPaolo Abeni struct list_head head; 441b19bc294SPaolo Abeni }; 442b19bc294SPaolo Abeni 443b19bc294SPaolo Abeni DECLARE_PER_CPU(struct mptcp_delegated_action, mptcp_delegated_actions); 444b19bc294SPaolo Abeni 445b19bc294SPaolo Abeni #define MPTCP_DELEGATE_SEND 0 446bcd97734SPaolo Abeni #define MPTCP_DELEGATE_ACK 1 447b19bc294SPaolo Abeni 4482303f994SPeter Krystad /* MPTCP subflow context */ 4492303f994SPeter Krystad struct mptcp_subflow_context { 450cec37a6eSPeter Krystad struct list_head node;/* conn_list of subflows */ 451b29fcfb5SPaolo Abeni 45263ec72bdSKees Cook struct_group(reset, 453b29fcfb5SPaolo Abeni 4543ce0852cSPaolo Abeni unsigned long avg_pacing_rate; /* protected by msk socket lock */ 455cec37a6eSPeter Krystad u64 local_key; 456cec37a6eSPeter Krystad u64 remote_key; 45779c0949eSPeter Krystad u64 idsn; 458648ef4b8SMat Martineau u64 map_seq; 459cc7972eaSChristoph Paasch u32 snd_isn; 46079c0949eSPeter Krystad u32 token; 4616d0060f6SMat Martineau u32 rel_write_seq; 462648ef4b8SMat Martineau u32 map_subflow_seq; 463648ef4b8SMat Martineau u32 ssn_offset; 464648ef4b8SMat Martineau u32 map_data_len; 465dd8bcd17SPaolo Abeni __wsum map_data_csum; 466dd8bcd17SPaolo Abeni u32 map_csum_len; 467cec37a6eSPeter Krystad u32 request_mptcp : 1, /* send MP_CAPABLE */ 468ec3edaa7SPeter Krystad request_join : 1, /* send MP_JOIN */ 469ec3edaa7SPeter Krystad request_bkup : 1, 470cec37a6eSPeter Krystad mp_capable : 1, /* remote is MPTCP capable */ 471f296234cSPeter Krystad mp_join : 1, /* remote is JOINing */ 4720be534f5SPaolo Abeni fully_established : 1, /* path validated */ 473f296234cSPeter Krystad pm_notified : 1, /* PM hook called for established status */ 474648ef4b8SMat Martineau conn_finished : 1, 475648ef4b8SMat Martineau map_valid : 1, 476dd8bcd17SPaolo Abeni map_csum_reqd : 1, 477dd8bcd17SPaolo Abeni map_data_fin : 1, 478d22f4988SChristoph Paasch mpc_map : 1, 479f296234cSPeter Krystad backup : 1, 48006706542SGeliang Tang send_mp_prio : 1, 481c25aeb4eSGeliang Tang send_mp_fail : 1, 482f284c0c7SPaolo Abeni send_fastclose : 1, 4831e39e5a3SGeliang Tang send_infinite_map : 1, 484d22f4988SChristoph Paasch rx_eof : 1, 485b3ea6b27SPaolo Abeni remote_key_valid : 1, /* received the peer key from */ 486ff5a0b42SPaolo Abeni disposable : 1, /* ctx can be free at ulp release time */ 4874cf86ae8SPaolo Abeni stale : 1, /* unable to snd/rcv data, do not use for xmit */ 488ae66fb2bSMat Martineau local_id_valid : 1, /* local_id is correctly initialized */ 489dfc8d060SDmytro Shytyi valid_csum_seen : 1, /* at least one csum validated */ 490dfc8d060SDmytro Shytyi is_mptfo : 1, /* subflow is doing TFO */ 491dfc8d060SDmytro Shytyi __unused : 8; 4926719331cSPaolo Abeni enum mptcp_data_avail data_avail; 493f296234cSPeter Krystad u32 remote_nonce; 494f296234cSPeter Krystad u64 thmac; 495f296234cSPeter Krystad u32 local_nonce; 496ec3edaa7SPeter Krystad u32 remote_token; 497b3ea6b27SPaolo Abeni union { 498b3ea6b27SPaolo Abeni u8 hmac[MPTCPOPT_HMAC_LEN]; /* MPJ subflow only */ 499b3ea6b27SPaolo Abeni u64 iasn; /* initial ack sequence number, MPC subflows only */ 500b3ea6b27SPaolo Abeni }; 501f296234cSPeter Krystad u8 local_id; 502f296234cSPeter Krystad u8 remote_id; 503dc87efdbSFlorian Westphal u8 reset_seen:1; 504dc87efdbSFlorian Westphal u8 reset_transient:1; 505dc87efdbSFlorian Westphal u8 reset_reason:4; 50671b7dec2SPaolo Abeni u8 stale_count; 507648ef4b8SMat Martineau 5086f06b4d4SPaolo Abeni u32 subflow_id; 5096f06b4d4SPaolo Abeni 510b19bc294SPaolo Abeni long delegated_status; 51176a13b31SGeliang Tang unsigned long fail_tout; 512b29fcfb5SPaolo Abeni 51363ec72bdSKees Cook ); 514b29fcfb5SPaolo Abeni 515b19bc294SPaolo Abeni struct list_head delegated_node; /* link into delegated_action, protected by local BH */ 516b19bc294SPaolo Abeni 517df00b087SFlorian Westphal u32 setsockopt_seq; 51871b7dec2SPaolo Abeni u32 stale_rcv_tstamp; 519df00b087SFlorian Westphal 5202303f994SPeter Krystad struct sock *tcp_sock; /* tcp sk backpointer */ 5212303f994SPeter Krystad struct sock *conn; /* parent mptcp_sock */ 522cec37a6eSPeter Krystad const struct inet_connection_sock_af_ops *icsk_af_ops; 523648ef4b8SMat Martineau void (*tcp_state_change)(struct sock *sk); 52415cc1045SPaolo Abeni void (*tcp_error_report)(struct sock *sk); 525648ef4b8SMat Martineau 5262303f994SPeter Krystad struct rcu_head rcu; 5272303f994SPeter Krystad }; 5282303f994SPeter Krystad 5292303f994SPeter Krystad static inline struct mptcp_subflow_context * 5302303f994SPeter Krystad mptcp_subflow_ctx(const struct sock *sk) 5312303f994SPeter Krystad { 5322303f994SPeter Krystad struct inet_connection_sock *icsk = inet_csk(sk); 5332303f994SPeter Krystad 5342303f994SPeter Krystad /* Use RCU on icsk_ulp_data only for sock diag code */ 5352303f994SPeter Krystad return (__force struct mptcp_subflow_context *)icsk->icsk_ulp_data; 5362303f994SPeter Krystad } 5372303f994SPeter Krystad 5382303f994SPeter Krystad static inline struct sock * 5392303f994SPeter Krystad mptcp_subflow_tcp_sock(const struct mptcp_subflow_context *subflow) 5402303f994SPeter Krystad { 5412303f994SPeter Krystad return subflow->tcp_sock; 5422303f994SPeter Krystad } 5432303f994SPeter Krystad 544b29fcfb5SPaolo Abeni static inline void 545b29fcfb5SPaolo Abeni mptcp_subflow_ctx_reset(struct mptcp_subflow_context *subflow) 546b29fcfb5SPaolo Abeni { 54763ec72bdSKees Cook memset(&subflow->reset, 0, sizeof(subflow->reset)); 548b29fcfb5SPaolo Abeni subflow->request_mptcp = 1; 549b29fcfb5SPaolo Abeni } 550b29fcfb5SPaolo Abeni 551648ef4b8SMat Martineau static inline u64 552648ef4b8SMat Martineau mptcp_subflow_get_map_offset(const struct mptcp_subflow_context *subflow) 553648ef4b8SMat Martineau { 554648ef4b8SMat Martineau return tcp_sk(mptcp_subflow_tcp_sock(subflow))->copied_seq - 555648ef4b8SMat Martineau subflow->ssn_offset - 556648ef4b8SMat Martineau subflow->map_subflow_seq; 557648ef4b8SMat Martineau } 558648ef4b8SMat Martineau 559648ef4b8SMat Martineau static inline u64 560648ef4b8SMat Martineau mptcp_subflow_get_mapped_dsn(const struct mptcp_subflow_context *subflow) 561648ef4b8SMat Martineau { 562648ef4b8SMat Martineau return subflow->map_seq + mptcp_subflow_get_map_offset(subflow); 563648ef4b8SMat Martineau } 564648ef4b8SMat Martineau 565b19bc294SPaolo Abeni void mptcp_subflow_process_delegated(struct sock *ssk); 566b19bc294SPaolo Abeni 567bcd97734SPaolo Abeni static inline void mptcp_subflow_delegate(struct mptcp_subflow_context *subflow, int action) 568b19bc294SPaolo Abeni { 569b19bc294SPaolo Abeni struct mptcp_delegated_action *delegated; 570b19bc294SPaolo Abeni bool schedule; 571b19bc294SPaolo Abeni 572bcd97734SPaolo Abeni /* the caller held the subflow bh socket lock */ 573bcd97734SPaolo Abeni lockdep_assert_in_softirq(); 574bcd97734SPaolo Abeni 575b19bc294SPaolo Abeni /* The implied barrier pairs with mptcp_subflow_delegated_done(), and 576b19bc294SPaolo Abeni * ensures the below list check sees list updates done prior to status 577b19bc294SPaolo Abeni * bit changes 578b19bc294SPaolo Abeni */ 579bcd97734SPaolo Abeni if (!test_and_set_bit(action, &subflow->delegated_status)) { 580b19bc294SPaolo Abeni /* still on delegated list from previous scheduling */ 581b19bc294SPaolo Abeni if (!list_empty(&subflow->delegated_node)) 582b19bc294SPaolo Abeni return; 583b19bc294SPaolo Abeni 584b19bc294SPaolo Abeni delegated = this_cpu_ptr(&mptcp_delegated_actions); 585b19bc294SPaolo Abeni schedule = list_empty(&delegated->head); 586b19bc294SPaolo Abeni list_add_tail(&subflow->delegated_node, &delegated->head); 587b19bc294SPaolo Abeni sock_hold(mptcp_subflow_tcp_sock(subflow)); 588b19bc294SPaolo Abeni if (schedule) 589b19bc294SPaolo Abeni napi_schedule(&delegated->napi); 590b19bc294SPaolo Abeni } 591b19bc294SPaolo Abeni } 592b19bc294SPaolo Abeni 593b19bc294SPaolo Abeni static inline struct mptcp_subflow_context * 594b19bc294SPaolo Abeni mptcp_subflow_delegated_next(struct mptcp_delegated_action *delegated) 595b19bc294SPaolo Abeni { 596b19bc294SPaolo Abeni struct mptcp_subflow_context *ret; 597b19bc294SPaolo Abeni 598b19bc294SPaolo Abeni if (list_empty(&delegated->head)) 599b19bc294SPaolo Abeni return NULL; 600b19bc294SPaolo Abeni 601b19bc294SPaolo Abeni ret = list_first_entry(&delegated->head, struct mptcp_subflow_context, delegated_node); 602b19bc294SPaolo Abeni list_del_init(&ret->delegated_node); 603b19bc294SPaolo Abeni return ret; 604b19bc294SPaolo Abeni } 605b19bc294SPaolo Abeni 606b19bc294SPaolo Abeni static inline bool mptcp_subflow_has_delegated_action(const struct mptcp_subflow_context *subflow) 607b19bc294SPaolo Abeni { 608bcd97734SPaolo Abeni return !!READ_ONCE(subflow->delegated_status); 609b19bc294SPaolo Abeni } 610b19bc294SPaolo Abeni 611bcd97734SPaolo Abeni static inline void mptcp_subflow_delegated_done(struct mptcp_subflow_context *subflow, int action) 612b19bc294SPaolo Abeni { 613b19bc294SPaolo Abeni /* pairs with mptcp_subflow_delegate, ensures delegate_node is updated before 614b19bc294SPaolo Abeni * touching the status bit 615b19bc294SPaolo Abeni */ 616b19bc294SPaolo Abeni smp_wmb(); 617bcd97734SPaolo Abeni clear_bit(action, &subflow->delegated_status); 618b19bc294SPaolo Abeni } 619b19bc294SPaolo Abeni 6206da14d74SPaolo Abeni int mptcp_is_enabled(const struct net *net); 6216da14d74SPaolo Abeni unsigned int mptcp_get_add_addr_timeout(const struct net *net); 6226da14d74SPaolo Abeni int mptcp_is_checksum_enabled(const struct net *net); 6236da14d74SPaolo Abeni int mptcp_allow_join_id0(const struct net *net); 624ff5a0b42SPaolo Abeni unsigned int mptcp_stale_loss_cnt(const struct net *net); 6256bb63cccSMat Martineau int mptcp_get_pm_type(const struct net *net); 626b93df08cSPaolo Abeni void mptcp_subflow_fully_established(struct mptcp_subflow_context *subflow, 627b3ea6b27SPaolo Abeni const struct mptcp_options_received *mp_opt); 6281e1d9d6fSPaolo Abeni bool __mptcp_retransmit_pending_data(struct sock *sk); 6298b38217aSMaxim Galaganov void mptcp_check_and_set_pending(struct sock *sk); 630ff5a0b42SPaolo Abeni void __mptcp_push_pending(struct sock *sk, unsigned int flags); 631648ef4b8SMat Martineau bool mptcp_subflow_data_available(struct sock *sk); 632d39dcecaSPaolo Abeni void __init mptcp_subflow_init(void); 633d0876b22SGeliang Tang void mptcp_subflow_shutdown(struct sock *sk, struct sock *ssk, int how); 634a141e02eSFlorian Westphal void mptcp_close_ssk(struct sock *sk, struct sock *ssk, 635e16163b6SPaolo Abeni struct mptcp_subflow_context *subflow); 636a6574302SMat Martineau void __mptcp_subflow_send_ack(struct sock *ssk); 637d5824847SPaolo Abeni void mptcp_subflow_reset(struct sock *ssk); 6382a6a870eSPaolo Abeni void mptcp_subflow_queue_clean(struct sock *sk, struct sock *ssk); 639866f26f2SPaolo Abeni void mptcp_sock_graft(struct sock *sk, struct socket *parent); 640ddb1a072SPaolo Abeni struct socket *__mptcp_nmpc_socket(struct mptcp_sock *msk); 64126d3e21cSMenglong Dong bool __mptcp_close(struct sock *sk, long timeout); 64230e51b92SMenglong Dong void mptcp_cancel_work(struct sock *sk); 64363740448SPaolo Abeni void __mptcp_unaccepted_force_close(struct sock *sk); 64436b122baSDmytro Shytyi void mptcp_set_owner_r(struct sk_buff *skb, struct sock *sk); 645ec3edaa7SPeter Krystad 6464638de5aSKishen Maloor bool mptcp_addresses_equal(const struct mptcp_addr_info *a, 6474638de5aSKishen Maloor const struct mptcp_addr_info *b, bool use_port); 648dc886bceSGeliang Tang void mptcp_local_address(const struct sock_common *skc, struct mptcp_addr_info *addr); 6494638de5aSKishen Maloor 650ec3edaa7SPeter Krystad /* called with sk socket lock held */ 651ef0da3b8SPaolo Abeni int __mptcp_subflow_connect(struct sock *sk, const struct mptcp_addr_info *loc, 652ee285257SGeliang Tang const struct mptcp_addr_info *remote); 6536bc1fe7dSPaolo Abeni int mptcp_subflow_create_socket(struct sock *sk, unsigned short family, 6546bc1fe7dSPaolo Abeni struct socket **new_sock); 6551729cf18SGeliang Tang void mptcp_info2sockaddr(const struct mptcp_addr_info *info, 6561729cf18SGeliang Tang struct sockaddr_storage *addr, 6571729cf18SGeliang Tang unsigned short family); 6582303f994SPeter Krystad 659c886d702SPaolo Abeni static inline bool __tcp_can_send(const struct sock *ssk) 660c886d702SPaolo Abeni { 661c886d702SPaolo Abeni /* only send if our side has not closed yet */ 662c886d702SPaolo Abeni return ((1 << inet_sk_state_load(ssk)) & (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT)); 663c886d702SPaolo Abeni } 664c886d702SPaolo Abeni 665ff5a0b42SPaolo Abeni static inline bool __mptcp_subflow_active(struct mptcp_subflow_context *subflow) 66643f1140bSGeliang Tang { 66743f1140bSGeliang Tang /* can't send if JOIN hasn't completed yet (i.e. is usable for mptcp) */ 66843f1140bSGeliang Tang if (subflow->request_join && !subflow->fully_established) 66943f1140bSGeliang Tang return false; 67043f1140bSGeliang Tang 671c886d702SPaolo Abeni return __tcp_can_send(mptcp_subflow_tcp_sock(subflow)); 67243f1140bSGeliang Tang } 67343f1140bSGeliang Tang 674ff5a0b42SPaolo Abeni void mptcp_subflow_set_active(struct mptcp_subflow_context *subflow); 675ff5a0b42SPaolo Abeni 676ff5a0b42SPaolo Abeni bool mptcp_subflow_active(struct mptcp_subflow_context *subflow); 677ff5a0b42SPaolo Abeni 678b6985b9bSPaolo Abeni void mptcp_subflow_drop_ctx(struct sock *ssk); 679b6985b9bSPaolo Abeni 680648ef4b8SMat Martineau static inline void mptcp_subflow_tcp_fallback(struct sock *sk, 681648ef4b8SMat Martineau struct mptcp_subflow_context *ctx) 682648ef4b8SMat Martineau { 683952382c6SFlorian Westphal sk->sk_data_ready = sock_def_readable; 684648ef4b8SMat Martineau sk->sk_state_change = ctx->tcp_state_change; 685952382c6SFlorian Westphal sk->sk_write_space = sk_stream_write_space; 68615cc1045SPaolo Abeni sk->sk_error_report = ctx->tcp_error_report; 687648ef4b8SMat Martineau 688648ef4b8SMat Martineau inet_csk(sk)->icsk_af_ops = ctx->icsk_af_ops; 689648ef4b8SMat Martineau } 690648ef4b8SMat Martineau 691d39dcecaSPaolo Abeni void __init mptcp_proto_init(void); 692784325e9SMatthieu Baerts #if IS_ENABLED(CONFIG_MPTCP_IPV6) 693d39dcecaSPaolo Abeni int __init mptcp_proto_v6_init(void); 694784325e9SMatthieu Baerts #endif 695648ef4b8SMat Martineau 6967e8b88ecSPaolo Abeni struct sock *mptcp_sk_clone_init(const struct sock *sk, 697cfde141eSPaolo Abeni const struct mptcp_options_received *mp_opt, 6987e8b88ecSPaolo Abeni struct sock *ssk, 699fca5c82cSPaolo Abeni struct request_sock *req); 7000799e21bSGeliang Tang void mptcp_get_options(const struct sk_buff *skb, 701cfde141eSPaolo Abeni struct mptcp_options_received *mp_opt); 702cec37a6eSPeter Krystad 703cec37a6eSPeter Krystad void mptcp_finish_connect(struct sock *sk); 704490274b4SPaolo Abeni void __mptcp_set_connected(struct sock *sk); 70576a13b31SGeliang Tang void mptcp_reset_timeout(struct mptcp_sock *msk, unsigned long fail_tout); 706b93df08cSPaolo Abeni static inline bool mptcp_is_fully_established(struct sock *sk) 707b93df08cSPaolo Abeni { 708b93df08cSPaolo Abeni return inet_sk_state_load(sk) == TCP_ESTABLISHED && 709b93df08cSPaolo Abeni READ_ONCE(mptcp_sk(sk)->fully_established); 710b93df08cSPaolo Abeni } 711a6b118feSFlorian Westphal void mptcp_rcv_space_init(struct mptcp_sock *msk, const struct sock *ssk); 7122e52213cSFlorian Westphal void mptcp_data_ready(struct sock *sk, struct sock *ssk); 713f296234cSPeter Krystad bool mptcp_finish_join(struct sock *sk); 714ba8f48f7SPaolo Abeni bool mptcp_schedule_work(struct sock *sk); 7150abdde82SPaolo Abeni int mptcp_setsockopt(struct sock *sk, int level, int optname, 7160abdde82SPaolo Abeni sockptr_t optval, unsigned int optlen); 7170abdde82SPaolo Abeni int mptcp_getsockopt(struct sock *sk, int level, int optname, 7180abdde82SPaolo Abeni char __user *optval, int __user *option); 7190abdde82SPaolo Abeni 7201502328fSPaolo Abeni u64 __mptcp_expand_seq(u64 old_seq, u64 cur_seq); 7211502328fSPaolo Abeni static inline u64 mptcp_expand_seq(u64 old_seq, u64 cur_seq, bool use_64bit) 7221502328fSPaolo Abeni { 7231502328fSPaolo Abeni if (use_64bit) 7241502328fSPaolo Abeni return cur_seq; 7251502328fSPaolo Abeni 7261502328fSPaolo Abeni return __mptcp_expand_seq(old_seq, cur_seq); 7271502328fSPaolo Abeni } 728219d0499SPaolo Abeni void __mptcp_check_push(struct sock *sk, struct sock *ssk); 7297439d687SPaolo Abeni void __mptcp_data_acked(struct sock *sk); 73015cc1045SPaolo Abeni void __mptcp_error_report(struct sock *sk); 73159832e24SFlorian Westphal void mptcp_subflow_eof(struct sock *sk); 7321a49b2c2SMat Martineau bool mptcp_update_rcv_data_fin(struct mptcp_sock *msk, u64 data_fin_seq, bool use_64bit); 733e16163b6SPaolo Abeni static inline bool mptcp_data_fin_enabled(const struct mptcp_sock *msk) 734e16163b6SPaolo Abeni { 735e16163b6SPaolo Abeni return READ_ONCE(msk->snd_data_fin_enable) && 736e16163b6SPaolo Abeni READ_ONCE(msk->write_seq) == READ_ONCE(msk->snd_nxt); 737e16163b6SPaolo Abeni } 738e16163b6SPaolo Abeni 7395cf92bbaSPaolo Abeni static inline bool mptcp_propagate_sndbuf(struct sock *sk, struct sock *ssk) 7405cf92bbaSPaolo Abeni { 7415cf92bbaSPaolo Abeni if ((sk->sk_userlocks & SOCK_SNDBUF_LOCK) || ssk->sk_sndbuf <= READ_ONCE(sk->sk_sndbuf)) 7425cf92bbaSPaolo Abeni return false; 7435cf92bbaSPaolo Abeni 7445cf92bbaSPaolo Abeni WRITE_ONCE(sk->sk_sndbuf, ssk->sk_sndbuf); 7455cf92bbaSPaolo Abeni return true; 7465cf92bbaSPaolo Abeni } 7475cf92bbaSPaolo Abeni 7485cf92bbaSPaolo Abeni static inline void mptcp_write_space(struct sock *sk) 7495cf92bbaSPaolo Abeni { 7505cf92bbaSPaolo Abeni if (sk_stream_is_writeable(sk)) { 7515cf92bbaSPaolo Abeni /* pairs with memory barrier in mptcp_poll */ 7525cf92bbaSPaolo Abeni smp_mb(); 7535cf92bbaSPaolo Abeni if (test_and_clear_bit(MPTCP_NOSPACE, &mptcp_sk(sk)->flags)) 7545cf92bbaSPaolo Abeni sk_stream_write_space(sk); 7555cf92bbaSPaolo Abeni } 7565cf92bbaSPaolo Abeni } 7575cf92bbaSPaolo Abeni 758c0bf3c6aSPaolo Abeni void mptcp_destroy_common(struct mptcp_sock *msk, unsigned int flags); 759cec37a6eSPeter Krystad 760c68a0cd1SJianguo Wu #define MPTCP_TOKEN_MAX_RETRIES 4 761c68a0cd1SJianguo Wu 7622c5ebd00SPaolo Abeni void __init mptcp_token_init(void); 7632c5ebd00SPaolo Abeni static inline void mptcp_token_init_request(struct request_sock *req) 7642c5ebd00SPaolo Abeni { 7652c5ebd00SPaolo Abeni mptcp_subflow_rsk(req)->token_node.pprev = NULL; 7662c5ebd00SPaolo Abeni } 7672c5ebd00SPaolo Abeni 76879c0949eSPeter Krystad int mptcp_token_new_request(struct request_sock *req); 7692c5ebd00SPaolo Abeni void mptcp_token_destroy_request(struct request_sock *req); 770294de909SMenglong Dong int mptcp_token_new_connect(struct sock *ssk); 7712c5ebd00SPaolo Abeni void mptcp_token_accept(struct mptcp_subflow_request_sock *r, 7722c5ebd00SPaolo Abeni struct mptcp_sock *msk); 773c83a47e5SFlorian Westphal bool mptcp_token_exists(u32 token); 774ea1300b9SFlorian Westphal struct mptcp_sock *mptcp_token_get_sock(struct net *net, u32 token); 77596d890daSPaolo Abeni struct mptcp_sock *mptcp_token_iter_next(const struct net *net, long *s_slot, 77696d890daSPaolo Abeni long *s_num); 7772c5ebd00SPaolo Abeni void mptcp_token_destroy(struct mptcp_sock *msk); 77879c0949eSPeter Krystad 77979c0949eSPeter Krystad void mptcp_crypto_key_sha(u64 key, u32 *token, u64 *idsn); 78079c0949eSPeter Krystad 7813df523abSPeter Krystad void mptcp_crypto_hmac_sha(u64 key1, u64 key2, u8 *msg, int len, void *hmac); 782ba2c89e0SPaolo Abeni __sum16 __mptcp_make_csum(u64 data_seq, u32 subflow_seq, u16 data_len, __wsum sum); 78379c0949eSPeter Krystad 784d39dcecaSPaolo Abeni void __init mptcp_pm_init(void); 7851b1c7a0eSPeter Krystad void mptcp_pm_data_init(struct mptcp_sock *msk); 786b29fcfb5SPaolo Abeni void mptcp_pm_data_reset(struct mptcp_sock *msk); 787702c2f64SFlorian Westphal int mptcp_pm_parse_addr(struct nlattr *attr, struct genl_info *info, 788702c2f64SFlorian Westphal struct mptcp_addr_info *addr); 7899ab4807cSKishen Maloor int mptcp_pm_parse_entry(struct nlattr *attr, struct genl_info *info, 7909ab4807cSKishen Maloor bool require_family, 7919ab4807cSKishen Maloor struct mptcp_pm_addr_entry *entry); 792fb00ee4fSMatthieu Baerts bool mptcp_pm_addr_families_match(const struct sock *sk, 793fb00ee4fSMatthieu Baerts const struct mptcp_addr_info *loc, 794fb00ee4fSMatthieu Baerts const struct mptcp_addr_info *rem); 79571b7dec2SPaolo Abeni void mptcp_pm_subflow_chk_stale(const struct mptcp_sock *msk, struct sock *ssk); 796ff5a0b42SPaolo Abeni void mptcp_pm_nl_subflow_chk_stale(const struct mptcp_sock *msk, struct sock *ssk); 7976c714f1bSFlorian Westphal void mptcp_pm_new_connection(struct mptcp_sock *msk, const struct sock *ssk, int server_side); 7987a486c44SPaolo Abeni void mptcp_pm_fully_established(struct mptcp_sock *msk, const struct sock *ssk); 7991b1c7a0eSPeter Krystad bool mptcp_pm_allow_new_subflow(struct mptcp_sock *msk); 8001b1c7a0eSPeter Krystad void mptcp_pm_connection_closed(struct mptcp_sock *msk); 80162535200SGeliang Tang void mptcp_pm_subflow_established(struct mptcp_sock *msk); 802a88c9e49SPaolo Abeni bool mptcp_pm_nl_check_work_pending(struct mptcp_sock *msk); 803a88c9e49SPaolo Abeni void mptcp_pm_subflow_check_next(struct mptcp_sock *msk, const struct sock *ssk, 804a88c9e49SPaolo Abeni const struct mptcp_subflow_context *subflow); 805d1ace2d9SKishen Maloor void mptcp_pm_add_addr_received(const struct sock *ssk, 8061b1c7a0eSPeter Krystad const struct mptcp_addr_info *addr); 807557963c3SGeliang Tang void mptcp_pm_add_addr_echoed(struct mptcp_sock *msk, 80890d93088SPaolo Abeni const struct mptcp_addr_info *addr); 80984dfe367SGeliang Tang void mptcp_pm_add_addr_send_ack(struct mptcp_sock *msk); 810b46a0238SGeliang Tang void mptcp_pm_nl_addr_send_ack(struct mptcp_sock *msk); 8115c4a824dSGeliang Tang void mptcp_pm_rm_addr_received(struct mptcp_sock *msk, 8125c4a824dSGeliang Tang const struct mptcp_rm_list *rm_list); 81340453a5cSGeliang Tang void mptcp_pm_mp_prio_received(struct sock *sk, u8 bkup); 8145580d41bSGeliang Tang void mptcp_pm_mp_fail_received(struct sock *sk, u64 fail_seq); 815892f396cSKishen Maloor int mptcp_pm_nl_mp_prio_send_ack(struct mptcp_sock *msk, 816892f396cSKishen Maloor struct mptcp_addr_info *addr, 817892f396cSKishen Maloor struct mptcp_addr_info *rem, 818892f396cSKishen Maloor u8 bkup); 8199ab4807cSKishen Maloor bool mptcp_pm_alloc_anno_list(struct mptcp_sock *msk, 820*528cb5f2SGeliang Tang const struct mptcp_addr_info *addr); 821b6c08380SGeliang Tang void mptcp_pm_free_anno_list(struct mptcp_sock *msk); 8225bc56388SGeliang Tang bool mptcp_pm_sport_in_anno_list(struct mptcp_sock *msk, const struct sock *sk); 82300cfd77bSGeliang Tang struct mptcp_pm_add_entry * 82400cfd77bSGeliang Tang mptcp_pm_del_add_timer(struct mptcp_sock *msk, 82590d93088SPaolo Abeni const struct mptcp_addr_info *addr, bool check_id); 826d88c476fSGeliang Tang struct mptcp_pm_add_entry * 82790d93088SPaolo Abeni mptcp_lookup_anno_list_by_saddr(const struct mptcp_sock *msk, 82890d93088SPaolo Abeni const struct mptcp_addr_info *addr); 8298b201370SKishen Maloor int mptcp_pm_get_flags_and_ifindex_by_id(struct mptcp_sock *msk, 8308b201370SKishen Maloor unsigned int id, 8318b201370SKishen Maloor u8 *flags, int *ifindex); 832f40be0dbSGeliang Tang int mptcp_pm_nl_get_flags_and_ifindex_by_id(struct mptcp_sock *msk, unsigned int id, 833f40be0dbSGeliang Tang u8 *flags, int *ifindex); 8348b201370SKishen Maloor int mptcp_userspace_pm_get_flags_and_ifindex_by_id(struct mptcp_sock *msk, 8358b201370SKishen Maloor unsigned int id, 836ee285257SGeliang Tang u8 *flags, int *ifindex); 8376ba7ce89SGeliang Tang int mptcp_pm_set_flags(struct net *net, struct nlattr *token, 8386ba7ce89SGeliang Tang struct mptcp_pm_addr_entry *loc, 8396ba7ce89SGeliang Tang struct mptcp_pm_addr_entry *rem, u8 bkup); 8406ba7ce89SGeliang Tang int mptcp_pm_nl_set_flags(struct net *net, struct mptcp_pm_addr_entry *addr, u8 bkup); 841892f396cSKishen Maloor int mptcp_userspace_pm_set_flags(struct net *net, struct nlattr *token, 842892f396cSKishen Maloor struct mptcp_pm_addr_entry *loc, 843892f396cSKishen Maloor struct mptcp_pm_addr_entry *rem, u8 bkup); 8441b1c7a0eSPeter Krystad int mptcp_pm_announce_addr(struct mptcp_sock *msk, 8456a6c05a8SGeliang Tang const struct mptcp_addr_info *addr, 846f7efc777SGeliang Tang bool echo); 847cbde2787SGeliang Tang int mptcp_pm_remove_addr(struct mptcp_sock *msk, const struct mptcp_rm_list *rm_list); 848ddd14bb8SGeliang Tang int mptcp_pm_remove_subflow(struct mptcp_sock *msk, const struct mptcp_rm_list *rm_list); 8498b1c94daSGeliang Tang void mptcp_pm_remove_addrs(struct mptcp_sock *msk, struct list_head *rm_list); 850d9a4594eSKishen Maloor void mptcp_pm_remove_addrs_and_subflows(struct mptcp_sock *msk, 851d9a4594eSKishen Maloor struct list_head *rm_list); 852d9a4594eSKishen Maloor 8534638de5aSKishen Maloor void mptcp_free_local_addr_list(struct mptcp_sock *msk); 8549ab4807cSKishen Maloor int mptcp_nl_cmd_announce(struct sk_buff *skb, struct genl_info *info); 855d9a4594eSKishen Maloor int mptcp_nl_cmd_remove(struct sk_buff *skb, struct genl_info *info); 856702c2f64SFlorian Westphal int mptcp_nl_cmd_sf_create(struct sk_buff *skb, struct genl_info *info); 857702c2f64SFlorian Westphal int mptcp_nl_cmd_sf_destroy(struct sk_buff *skb, struct genl_info *info); 8581b1c7a0eSPeter Krystad 859b911c97cSFlorian Westphal void mptcp_event(enum mptcp_event_type type, const struct mptcp_sock *msk, 860b911c97cSFlorian Westphal const struct sock *ssk, gfp_t gfp); 861d1ace2d9SKishen Maloor void mptcp_event_addr_announced(const struct sock *ssk, const struct mptcp_addr_info *info); 862b911c97cSFlorian Westphal void mptcp_event_addr_removed(const struct mptcp_sock *msk, u8 id); 863f8c9dfbdSGeliang Tang void mptcp_event_pm_listener(const struct sock *ssk, 864f8c9dfbdSGeliang Tang enum mptcp_event_type event); 8654d25247dSKishen Maloor bool mptcp_userspace_pm_active(const struct mptcp_sock *msk); 866b911c97cSFlorian Westphal 867dfc8d060SDmytro Shytyi void mptcp_fastopen_gen_msk_ackseq(struct mptcp_sock *msk, struct mptcp_subflow_context *subflow, 868dfc8d060SDmytro Shytyi const struct mptcp_options_received *mp_opt); 86936b122baSDmytro Shytyi void mptcp_fastopen_subflow_synack_set_params(struct mptcp_subflow_context *subflow, 87036b122baSDmytro Shytyi struct request_sock *req); 871dfc8d060SDmytro Shytyi 872f643b803SGeliang Tang static inline bool mptcp_pm_should_add_signal(struct mptcp_sock *msk) 8731b1c7a0eSPeter Krystad { 87418fc1a92SYonglong Li return READ_ONCE(msk->pm.addr_signal) & 87518fc1a92SYonglong Li (BIT(MPTCP_ADD_ADDR_SIGNAL) | BIT(MPTCP_ADD_ADDR_ECHO)); 87618fc1a92SYonglong Li } 87718fc1a92SYonglong Li 87818fc1a92SYonglong Li static inline bool mptcp_pm_should_add_signal_addr(struct mptcp_sock *msk) 87918fc1a92SYonglong Li { 88013ad9f01SGeliang Tang return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_SIGNAL); 881d91d322aSGeliang Tang } 882d91d322aSGeliang Tang 883d91d322aSGeliang Tang static inline bool mptcp_pm_should_add_signal_echo(struct mptcp_sock *msk) 884d91d322aSGeliang Tang { 88513ad9f01SGeliang Tang return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_ECHO); 8861b1c7a0eSPeter Krystad } 8871b1c7a0eSPeter Krystad 8885cb104aeSGeliang Tang static inline bool mptcp_pm_should_rm_signal(struct mptcp_sock *msk) 8895cb104aeSGeliang Tang { 89013ad9f01SGeliang Tang return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_RM_ADDR_SIGNAL); 8915cb104aeSGeliang Tang } 8925cb104aeSGeliang Tang 89314b06811SMat Martineau static inline bool mptcp_pm_is_userspace(const struct mptcp_sock *msk) 89414b06811SMat Martineau { 89514b06811SMat Martineau return READ_ONCE(msk->pm.pm_type) == MPTCP_PM_TYPE_USERSPACE; 89614b06811SMat Martineau } 89714b06811SMat Martineau 8984d25247dSKishen Maloor static inline bool mptcp_pm_is_kernel(const struct mptcp_sock *msk) 8994d25247dSKishen Maloor { 9004d25247dSKishen Maloor return READ_ONCE(msk->pm.pm_type) == MPTCP_PM_TYPE_KERNEL; 9014d25247dSKishen Maloor } 9024d25247dSKishen Maloor 9034a2777a8SGeliang Tang static inline unsigned int mptcp_add_addr_len(int family, bool echo, bool port) 9041b1c7a0eSPeter Krystad { 9052ec72faeSGeliang Tang u8 len = TCPOLEN_MPTCP_ADD_ADDR_BASE; 9062ec72faeSGeliang Tang 9072ec72faeSGeliang Tang if (family == AF_INET6) 9082ec72faeSGeliang Tang len = TCPOLEN_MPTCP_ADD_ADDR6_BASE; 9092ec72faeSGeliang Tang if (!echo) 9102ec72faeSGeliang Tang len += MPTCPOPT_THMAC_LEN; 91127ab92d9SDavide Caratti /* account for 2 trailing 'nop' options */ 9124a2777a8SGeliang Tang if (port) 91327ab92d9SDavide Caratti len += TCPOLEN_MPTCP_PORT_LEN + TCPOLEN_MPTCP_PORT_ALIGN; 9142ec72faeSGeliang Tang 9152ec72faeSGeliang Tang return len; 9161b1c7a0eSPeter Krystad } 9171b1c7a0eSPeter Krystad 9186445e17aSGeliang Tang static inline int mptcp_rm_addr_len(const struct mptcp_rm_list *rm_list) 9196445e17aSGeliang Tang { 9206445e17aSGeliang Tang if (rm_list->nr == 0 || rm_list->nr > MPTCP_RM_IDS_MAX) 9216445e17aSGeliang Tang return -EINVAL; 9226445e17aSGeliang Tang 9236445e17aSGeliang Tang return TCPOLEN_MPTCP_RM_ADDR_BASE + roundup(rm_list->nr - 1, 4) + 1; 9246445e17aSGeliang Tang } 9256445e17aSGeliang Tang 92690d93088SPaolo Abeni bool mptcp_pm_add_addr_signal(struct mptcp_sock *msk, const struct sk_buff *skb, 9271f5e9e2fSYonglong Li unsigned int opt_size, unsigned int remaining, 928f462a446SYonglong Li struct mptcp_addr_info *addr, bool *echo, 929af7939f3SGeliang Tang bool *drop_other_suboptions); 9305cb104aeSGeliang Tang bool mptcp_pm_rm_addr_signal(struct mptcp_sock *msk, unsigned int remaining, 9316445e17aSGeliang Tang struct mptcp_rm_list *rm_list); 9321b1c7a0eSPeter Krystad int mptcp_pm_get_local_id(struct mptcp_sock *msk, struct sock_common *skc); 9339bbec87eSGeliang Tang int mptcp_pm_nl_get_local_id(struct mptcp_sock *msk, struct mptcp_addr_info *skc); 9348b201370SKishen Maloor int mptcp_userspace_pm_get_local_id(struct mptcp_sock *msk, struct mptcp_addr_info *skc); 9351b1c7a0eSPeter Krystad 936d39dcecaSPaolo Abeni void __init mptcp_pm_nl_init(void); 937e9801430SFlorian Westphal void mptcp_pm_nl_work(struct mptcp_sock *msk); 938ddd14bb8SGeliang Tang void mptcp_pm_nl_rm_subflow_received(struct mptcp_sock *msk, 939ddd14bb8SGeliang Tang const struct mptcp_rm_list *rm_list); 94090d93088SPaolo Abeni unsigned int mptcp_pm_get_add_addr_signal_max(const struct mptcp_sock *msk); 94190d93088SPaolo Abeni unsigned int mptcp_pm_get_add_addr_accept_max(const struct mptcp_sock *msk); 94290d93088SPaolo Abeni unsigned int mptcp_pm_get_subflows_max(const struct mptcp_sock *msk); 94390d93088SPaolo Abeni unsigned int mptcp_pm_get_local_addr_max(const struct mptcp_sock *msk); 94401cacb00SPaolo Abeni 94595d68651SPaolo Abeni /* called under PM lock */ 94695d68651SPaolo Abeni static inline void __mptcp_pm_close_subflow(struct mptcp_sock *msk) 94795d68651SPaolo Abeni { 94895d68651SPaolo Abeni if (--msk->pm.subflows < mptcp_pm_get_subflows_max(msk)) 94995d68651SPaolo Abeni WRITE_ONCE(msk->pm.accept_subflow, true); 95095d68651SPaolo Abeni } 95195d68651SPaolo Abeni 95295d68651SPaolo Abeni static inline void mptcp_pm_close_subflow(struct mptcp_sock *msk) 95395d68651SPaolo Abeni { 95495d68651SPaolo Abeni spin_lock_bh(&msk->pm.lock); 95595d68651SPaolo Abeni __mptcp_pm_close_subflow(msk); 95695d68651SPaolo Abeni spin_unlock_bh(&msk->pm.lock); 95795d68651SPaolo Abeni } 95895d68651SPaolo Abeni 95978962489SFlorian Westphal void mptcp_sockopt_sync(struct mptcp_sock *msk, struct sock *ssk); 9603e501490SPaolo Abeni void mptcp_sockopt_sync_locked(struct mptcp_sock *msk, struct sock *ssk); 96178962489SFlorian Westphal 962dc87efdbSFlorian Westphal static inline struct mptcp_ext *mptcp_get_ext(const struct sk_buff *skb) 9636d0060f6SMat Martineau { 9646d0060f6SMat Martineau return (struct mptcp_ext *)skb_ext_find(skb, SKB_EXT_MPTCP); 9656d0060f6SMat Martineau } 9666d0060f6SMat Martineau 9675147dfb5SDavide Caratti void mptcp_diag_subflow_init(struct tcp_ulp_ops *ops); 9685147dfb5SDavide Caratti 969d5f49190SPaolo Abeni static inline bool __mptcp_check_fallback(const struct mptcp_sock *msk) 970e1ff9e82SDavide Caratti { 971e1ff9e82SDavide Caratti return test_bit(MPTCP_FALLBACK_DONE, &msk->flags); 972e1ff9e82SDavide Caratti } 973e1ff9e82SDavide Caratti 974d5f49190SPaolo Abeni static inline bool mptcp_check_fallback(const struct sock *sk) 975e1ff9e82SDavide Caratti { 976e1ff9e82SDavide Caratti struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); 977e1ff9e82SDavide Caratti struct mptcp_sock *msk = mptcp_sk(subflow->conn); 978e1ff9e82SDavide Caratti 979e1ff9e82SDavide Caratti return __mptcp_check_fallback(msk); 980e1ff9e82SDavide Caratti } 981e1ff9e82SDavide Caratti 982e1ff9e82SDavide Caratti static inline void __mptcp_do_fallback(struct mptcp_sock *msk) 983e1ff9e82SDavide Caratti { 984e1ff9e82SDavide Caratti if (test_bit(MPTCP_FALLBACK_DONE, &msk->flags)) { 985e1ff9e82SDavide Caratti pr_debug("TCP fallback already done (msk=%p)", msk); 986e1ff9e82SDavide Caratti return; 987e1ff9e82SDavide Caratti } 988e1ff9e82SDavide Caratti set_bit(MPTCP_FALLBACK_DONE, &msk->flags); 989e1ff9e82SDavide Caratti } 990e1ff9e82SDavide Caratti 991d51991e2SPaolo Abeni static inline void mptcp_do_fallback(struct sock *ssk) 992e1ff9e82SDavide Caratti { 993d51991e2SPaolo Abeni struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); 994d51991e2SPaolo Abeni struct sock *sk = subflow->conn; 995d51991e2SPaolo Abeni struct mptcp_sock *msk; 996e1ff9e82SDavide Caratti 997d51991e2SPaolo Abeni msk = mptcp_sk(sk); 998e1ff9e82SDavide Caratti __mptcp_do_fallback(msk); 999d51991e2SPaolo Abeni if (READ_ONCE(msk->snd_data_fin_enable) && !(ssk->sk_shutdown & SEND_SHUTDOWN)) { 1000d51991e2SPaolo Abeni gfp_t saved_allocation = ssk->sk_allocation; 1001d51991e2SPaolo Abeni 1002d51991e2SPaolo Abeni /* we are in a atomic (BH) scope, override ssk default for data 1003d51991e2SPaolo Abeni * fin allocation 1004d51991e2SPaolo Abeni */ 1005d51991e2SPaolo Abeni ssk->sk_allocation = GFP_ATOMIC; 1006d51991e2SPaolo Abeni ssk->sk_shutdown |= SEND_SHUTDOWN; 1007d51991e2SPaolo Abeni tcp_shutdown(ssk, SEND_SHUTDOWN); 1008d51991e2SPaolo Abeni ssk->sk_allocation = saved_allocation; 1009d51991e2SPaolo Abeni } 1010e1ff9e82SDavide Caratti } 1011e1ff9e82SDavide Caratti 1012e1ff9e82SDavide Caratti #define pr_fallback(a) pr_debug("%s:fallback to TCP (msk=%p)", __func__, a) 1013e1ff9e82SDavide Caratti 10141e39e5a3SGeliang Tang static inline bool mptcp_check_infinite_map(struct sk_buff *skb) 10151e39e5a3SGeliang Tang { 10161e39e5a3SGeliang Tang struct mptcp_ext *mpext; 10171e39e5a3SGeliang Tang 10181e39e5a3SGeliang Tang mpext = skb ? mptcp_get_ext(skb) : NULL; 10191e39e5a3SGeliang Tang if (mpext && mpext->infinite_map) 10201e39e5a3SGeliang Tang return true; 10211e39e5a3SGeliang Tang 10221e39e5a3SGeliang Tang return false; 10231e39e5a3SGeliang Tang } 10241e39e5a3SGeliang Tang 102570c708e8SKishen Maloor static inline bool is_active_ssk(struct mptcp_subflow_context *subflow) 102670c708e8SKishen Maloor { 102770c708e8SKishen Maloor return (subflow->request_mptcp || subflow->request_join); 102870c708e8SKishen Maloor } 102970c708e8SKishen Maloor 10308fd73804SDavide Caratti static inline bool subflow_simultaneous_connect(struct sock *sk) 10318fd73804SDavide Caratti { 10328fd73804SDavide Caratti struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); 10338fd73804SDavide Caratti 10348fd73804SDavide Caratti return sk->sk_state == TCP_ESTABLISHED && 103570c708e8SKishen Maloor is_active_ssk(subflow) && 10368fd73804SDavide Caratti !subflow->conn_finished; 10378fd73804SDavide Caratti } 10388fd73804SDavide Caratti 10399466a1ccSFlorian Westphal #ifdef CONFIG_SYN_COOKIES 10409466a1ccSFlorian Westphal void subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req, 10419466a1ccSFlorian Westphal struct sk_buff *skb); 10429466a1ccSFlorian Westphal bool mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req, 10439466a1ccSFlorian Westphal struct sk_buff *skb); 10449466a1ccSFlorian Westphal void __init mptcp_join_cookie_init(void); 10459466a1ccSFlorian Westphal #else 10469466a1ccSFlorian Westphal static inline void 10479466a1ccSFlorian Westphal subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req, 10489466a1ccSFlorian Westphal struct sk_buff *skb) {} 10499466a1ccSFlorian Westphal static inline bool 10509466a1ccSFlorian Westphal mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req, 10519466a1ccSFlorian Westphal struct sk_buff *skb) 10529466a1ccSFlorian Westphal { 10539466a1ccSFlorian Westphal return false; 10549466a1ccSFlorian Westphal } 10559466a1ccSFlorian Westphal 10569466a1ccSFlorian Westphal static inline void mptcp_join_cookie_init(void) {} 10579466a1ccSFlorian Westphal #endif 10589466a1ccSFlorian Westphal 1059f870fa0bSMat Martineau #endif /* __MPTCP_PROTOCOL_H */ 1060