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 16aab4d856SDavide Caratti #include "mptcp_pm_gen.h" 17aab4d856SDavide Caratti 18cc7972eaSChristoph Paasch #define MPTCP_SUPPORTED_VERSION 1 19eda7acddSPeter Krystad 20eda7acddSPeter Krystad /* MPTCP option bits */ 21eda7acddSPeter Krystad #define OPTION_MPTCP_MPC_SYN BIT(0) 22eda7acddSPeter Krystad #define OPTION_MPTCP_MPC_SYNACK BIT(1) 23eda7acddSPeter Krystad #define OPTION_MPTCP_MPC_ACK BIT(2) 24f296234cSPeter Krystad #define OPTION_MPTCP_MPJ_SYN BIT(3) 25f296234cSPeter Krystad #define OPTION_MPTCP_MPJ_SYNACK BIT(4) 26f296234cSPeter Krystad #define OPTION_MPTCP_MPJ_ACK BIT(5) 273df523abSPeter Krystad #define OPTION_MPTCP_ADD_ADDR BIT(6) 28fef6b7ecSGeliang Tang #define OPTION_MPTCP_RM_ADDR BIT(7) 29fef6b7ecSGeliang Tang #define OPTION_MPTCP_FASTCLOSE BIT(8) 30fef6b7ecSGeliang Tang #define OPTION_MPTCP_PRIO BIT(9) 31fef6b7ecSGeliang Tang #define OPTION_MPTCP_RST BIT(10) 321bff1e43SPaolo Abeni #define OPTION_MPTCP_DSS BIT(11) 33c25aeb4eSGeliang Tang #define OPTION_MPTCP_FAIL BIT(12) 34eda7acddSPeter Krystad 3574c7dfbeSPaolo Abeni #define OPTION_MPTCP_CSUMREQD BIT(13) 3674c7dfbeSPaolo Abeni 3774c7dfbeSPaolo Abeni #define OPTIONS_MPTCP_MPC (OPTION_MPTCP_MPC_SYN | OPTION_MPTCP_MPC_SYNACK | \ 3874c7dfbeSPaolo Abeni OPTION_MPTCP_MPC_ACK) 3974c7dfbeSPaolo Abeni #define OPTIONS_MPTCP_MPJ (OPTION_MPTCP_MPJ_SYN | OPTION_MPTCP_MPJ_SYNACK | \ 40780aa120SWan Jiabing OPTION_MPTCP_MPJ_ACK) 4174c7dfbeSPaolo Abeni 42eda7acddSPeter Krystad /* MPTCP option subtypes */ 43eda7acddSPeter Krystad #define MPTCPOPT_MP_CAPABLE 0 44eda7acddSPeter Krystad #define MPTCPOPT_MP_JOIN 1 45eda7acddSPeter Krystad #define MPTCPOPT_DSS 2 46eda7acddSPeter Krystad #define MPTCPOPT_ADD_ADDR 3 47eda7acddSPeter Krystad #define MPTCPOPT_RM_ADDR 4 48eda7acddSPeter Krystad #define MPTCPOPT_MP_PRIO 5 49eda7acddSPeter Krystad #define MPTCPOPT_MP_FAIL 6 50eda7acddSPeter Krystad #define MPTCPOPT_MP_FASTCLOSE 7 51dc87efdbSFlorian Westphal #define MPTCPOPT_RST 8 52eda7acddSPeter Krystad 53eda7acddSPeter Krystad /* MPTCP suboption lengths */ 54cc7972eaSChristoph Paasch #define TCPOLEN_MPTCP_MPC_SYN 4 55eda7acddSPeter Krystad #define TCPOLEN_MPTCP_MPC_SYNACK 12 56eda7acddSPeter Krystad #define TCPOLEN_MPTCP_MPC_ACK 20 57cc7972eaSChristoph Paasch #define TCPOLEN_MPTCP_MPC_ACK_DATA 22 58f296234cSPeter Krystad #define TCPOLEN_MPTCP_MPJ_SYN 12 59f296234cSPeter Krystad #define TCPOLEN_MPTCP_MPJ_SYNACK 16 60f296234cSPeter Krystad #define TCPOLEN_MPTCP_MPJ_ACK 24 616d0060f6SMat Martineau #define TCPOLEN_MPTCP_DSS_BASE 4 62648ef4b8SMat Martineau #define TCPOLEN_MPTCP_DSS_ACK32 4 636d0060f6SMat Martineau #define TCPOLEN_MPTCP_DSS_ACK64 8 64648ef4b8SMat Martineau #define TCPOLEN_MPTCP_DSS_MAP32 10 656d0060f6SMat Martineau #define TCPOLEN_MPTCP_DSS_MAP64 14 666d0060f6SMat Martineau #define TCPOLEN_MPTCP_DSS_CHECKSUM 2 673df523abSPeter Krystad #define TCPOLEN_MPTCP_ADD_ADDR 16 6827ab92d9SDavide Caratti #define TCPOLEN_MPTCP_ADD_ADDR_PORT 18 693df523abSPeter Krystad #define TCPOLEN_MPTCP_ADD_ADDR_BASE 8 7027ab92d9SDavide Caratti #define TCPOLEN_MPTCP_ADD_ADDR_BASE_PORT 10 713df523abSPeter Krystad #define TCPOLEN_MPTCP_ADD_ADDR6 28 7227ab92d9SDavide Caratti #define TCPOLEN_MPTCP_ADD_ADDR6_PORT 30 733df523abSPeter Krystad #define TCPOLEN_MPTCP_ADD_ADDR6_BASE 20 7427ab92d9SDavide Caratti #define TCPOLEN_MPTCP_ADD_ADDR6_BASE_PORT 22 7527ab92d9SDavide Caratti #define TCPOLEN_MPTCP_PORT_LEN 2 7627ab92d9SDavide Caratti #define TCPOLEN_MPTCP_PORT_ALIGN 2 776445e17aSGeliang Tang #define TCPOLEN_MPTCP_RM_ADDR_BASE 3 78ec99a470SDavide Caratti #define TCPOLEN_MPTCP_PRIO 3 79ec99a470SDavide Caratti #define TCPOLEN_MPTCP_PRIO_ALIGN 4 8050c504a2SFlorian Westphal #define TCPOLEN_MPTCP_FASTCLOSE 12 81dc87efdbSFlorian Westphal #define TCPOLEN_MPTCP_RST 4 82c25aeb4eSGeliang Tang #define TCPOLEN_MPTCP_FAIL 12 83eda7acddSPeter Krystad 84208e8f66SGeliang Tang #define TCPOLEN_MPTCP_MPC_ACK_DATA_CSUM (TCPOLEN_MPTCP_DSS_CHECKSUM + TCPOLEN_MPTCP_MPC_ACK_DATA) 85208e8f66SGeliang Tang 86ec3edaa7SPeter Krystad /* MPTCP MP_JOIN flags */ 87f296234cSPeter Krystad #define MPTCPOPT_BACKUP BIT(0) 88ec3edaa7SPeter Krystad #define MPTCPOPT_THMAC_LEN 8 89f296234cSPeter Krystad 90eda7acddSPeter Krystad /* MPTCP MP_CAPABLE flags */ 91eda7acddSPeter Krystad #define MPTCP_VERSION_MASK (0x0F) 92eda7acddSPeter Krystad #define MPTCP_CAP_CHECKSUM_REQD BIT(7) 93eda7acddSPeter Krystad #define MPTCP_CAP_EXTENSIBILITY BIT(6) 94bab6b88eSGeliang Tang #define MPTCP_CAP_DENY_JOIN_ID0 BIT(5) 9565492c5aSPaolo Abeni #define MPTCP_CAP_HMAC_SHA256 BIT(0) 96bab6b88eSGeliang Tang #define MPTCP_CAP_FLAG_MASK (0x1F) 97eda7acddSPeter Krystad 986d0060f6SMat Martineau /* MPTCP DSS flags */ 996d0060f6SMat Martineau #define MPTCP_DSS_DATA_FIN BIT(4) 1006d0060f6SMat Martineau #define MPTCP_DSS_DSN64 BIT(3) 1016d0060f6SMat Martineau #define MPTCP_DSS_HAS_MAP BIT(2) 1026d0060f6SMat Martineau #define MPTCP_DSS_ACK64 BIT(1) 1036d0060f6SMat Martineau #define MPTCP_DSS_HAS_ACK BIT(0) 104648ef4b8SMat Martineau #define MPTCP_DSS_FLAG_MASK (0x1F) 105648ef4b8SMat Martineau 1063df523abSPeter Krystad /* MPTCP ADD_ADDR flags */ 1073df523abSPeter Krystad #define MPTCP_ADDR_ECHO BIT(0) 1083df523abSPeter Krystad 10940453a5cSGeliang Tang /* MPTCP MP_PRIO flags */ 11040453a5cSGeliang Tang #define MPTCP_PRIO_BKUP BIT(0) 11140453a5cSGeliang Tang 112dc87efdbSFlorian Westphal /* MPTCP TCPRST flags */ 113dc87efdbSFlorian Westphal #define MPTCP_RST_TRANSIENT BIT(0) 114dc87efdbSFlorian Westphal 115e9d09bacSPaolo Abeni /* MPTCP socket atomic flags */ 1168edf0864SFlorian Westphal #define MPTCP_NOSPACE 1 1173b1d6210SPaolo Abeni #define MPTCP_WORK_RTX 2 118e1ff9e82SDavide Caratti #define MPTCP_FALLBACK_DONE 4 1190e4f35d7SPaolo Abeni #define MPTCP_WORK_CLOSE_SUBFLOW 5 120e9d09bacSPaolo Abeni 121e9d09bacSPaolo Abeni /* MPTCP socket release cb flags */ 122e9d09bacSPaolo Abeni #define MPTCP_PUSH_PENDING 1 123e9d09bacSPaolo Abeni #define MPTCP_CLEAN_UNA 2 124e9d09bacSPaolo Abeni #define MPTCP_ERROR_REPORT 3 125e9d09bacSPaolo Abeni #define MPTCP_RETRANSMIT 4 126e9d09bacSPaolo Abeni #define MPTCP_FLUSH_JOIN_LIST 5 127e9d09bacSPaolo Abeni #define MPTCP_CONNECTED 6 1288005184fSPaolo Abeni #define MPTCP_SYNC_SNDBUF 7 1296d0060f6SMat Martineau 130dfc8d060SDmytro Shytyi struct mptcp_skb_cb { 131dfc8d060SDmytro Shytyi u64 map_seq; 132dfc8d060SDmytro Shytyi u64 end_seq; 133dfc8d060SDmytro Shytyi u32 offset; 134dfc8d060SDmytro Shytyi u8 has_rxtstamp:1; 135dfc8d060SDmytro Shytyi }; 136dfc8d060SDmytro Shytyi 137dfc8d060SDmytro Shytyi #define MPTCP_SKB_CB(__skb) ((struct mptcp_skb_cb *)&((__skb)->cb[0])) 138dfc8d060SDmytro Shytyi 139eaa2ffabSPaolo Abeni static inline bool before64(__u64 seq1, __u64 seq2) 140eaa2ffabSPaolo Abeni { 141eaa2ffabSPaolo Abeni return (__s64)(seq1 - seq2) < 0; 142eaa2ffabSPaolo Abeni } 143eaa2ffabSPaolo Abeni 144eaa2ffabSPaolo Abeni #define after64(seq2, seq1) before64(seq1, seq2) 145eaa2ffabSPaolo Abeni 146cfde141eSPaolo Abeni struct mptcp_options_received { 147cfde141eSPaolo Abeni u64 sndr_key; 148cfde141eSPaolo Abeni u64 rcvr_key; 149cfde141eSPaolo Abeni u64 data_ack; 150cfde141eSPaolo Abeni u64 data_seq; 151cfde141eSPaolo Abeni u32 subflow_seq; 152cfde141eSPaolo Abeni u16 data_len; 153208e8f66SGeliang Tang __sum16 csum; 15474c7dfbeSPaolo Abeni u16 suboptions; 155cfde141eSPaolo Abeni u32 token; 156cfde141eSPaolo Abeni u32 nonce; 157a086aebaSPaolo Abeni u16 use_map:1, 158cfde141eSPaolo Abeni dsn64:1, 159cfde141eSPaolo Abeni data_fin:1, 160cfde141eSPaolo Abeni use_ack:1, 161cfde141eSPaolo Abeni ack64:1, 162cfde141eSPaolo Abeni mpc_map:1, 163a086aebaSPaolo Abeni reset_reason:4, 164a086aebaSPaolo Abeni reset_transient:1, 165a086aebaSPaolo Abeni echo:1, 166a086aebaSPaolo Abeni backup:1, 167a086aebaSPaolo Abeni deny_join_id0:1, 168cfde141eSPaolo Abeni __unused:2; 169a086aebaSPaolo Abeni u8 join_id; 170a086aebaSPaolo Abeni u64 thmac; 171a086aebaSPaolo Abeni u8 hmac[MPTCPOPT_HMAC_LEN]; 172f7dafee1SGeliang Tang struct mptcp_addr_info addr; 1735c4a824dSGeliang Tang struct mptcp_rm_list rm_list; 174cfde141eSPaolo Abeni u64 ahmac; 1755580d41bSGeliang Tang u64 fail_seq; 176cfde141eSPaolo Abeni }; 177cfde141eSPaolo Abeni 1783df523abSPeter Krystad static inline __be32 mptcp_option(u8 subopt, u8 len, u8 nib, u8 field) 1793df523abSPeter Krystad { 1803df523abSPeter Krystad return htonl((TCPOPT_MPTCP << 24) | (len << 16) | (subopt << 12) | 1813df523abSPeter Krystad ((nib & 0xF) << 8) | field); 1823df523abSPeter Krystad } 1833df523abSPeter Krystad 1841b1c7a0eSPeter Krystad enum mptcp_pm_status { 1851b1c7a0eSPeter Krystad MPTCP_PM_ADD_ADDR_RECEIVED, 18684dfe367SGeliang Tang MPTCP_PM_ADD_ADDR_SEND_ACK, 187d0876b22SGeliang Tang MPTCP_PM_RM_ADDR_RECEIVED, 1881b1c7a0eSPeter Krystad MPTCP_PM_ESTABLISHED, 1891b1c7a0eSPeter Krystad MPTCP_PM_SUBFLOW_ESTABLISHED, 19086e39e04SPaolo Abeni MPTCP_PM_ALREADY_ESTABLISHED, /* persistent status, set after ESTABLISHED event */ 19186e39e04SPaolo Abeni MPTCP_PM_MPC_ENDPOINT_ACCOUNTED /* persistent status, set after MPC local address is 19286e39e04SPaolo Abeni * accounted int id_avail_bitmap 19386e39e04SPaolo Abeni */ 1941b1c7a0eSPeter Krystad }; 1951b1c7a0eSPeter Krystad 196d85a8fdeSMat Martineau enum mptcp_pm_type { 197d85a8fdeSMat Martineau MPTCP_PM_TYPE_KERNEL = 0, 198d85a8fdeSMat Martineau MPTCP_PM_TYPE_USERSPACE, 199d85a8fdeSMat Martineau 200d85a8fdeSMat Martineau __MPTCP_PM_TYPE_NR, 201d85a8fdeSMat Martineau __MPTCP_PM_TYPE_MAX = __MPTCP_PM_TYPE_NR - 1, 202d85a8fdeSMat Martineau }; 203d85a8fdeSMat Martineau 20486e39e04SPaolo Abeni /* Status bits below MPTCP_PM_ALREADY_ESTABLISHED need pm worker actions */ 20586e39e04SPaolo Abeni #define MPTCP_PM_WORK_MASK ((1 << MPTCP_PM_ALREADY_ESTABLISHED) - 1) 20686e39e04SPaolo Abeni 20713ad9f01SGeliang Tang enum mptcp_addr_signal_status { 208d91d322aSGeliang Tang MPTCP_ADD_ADDR_SIGNAL, 209d91d322aSGeliang Tang MPTCP_ADD_ADDR_ECHO, 21042842a42SGeliang Tang MPTCP_RM_ADDR_SIGNAL, 211d91d322aSGeliang Tang }; 212d91d322aSGeliang Tang 21386e39e04SPaolo Abeni /* max value of mptcp_addr_info.id */ 21486e39e04SPaolo Abeni #define MPTCP_PM_MAX_ADDR_ID U8_MAX 21586e39e04SPaolo Abeni 2161b1c7a0eSPeter Krystad struct mptcp_pm_data { 2171b1c7a0eSPeter Krystad struct mptcp_addr_info local; 2181b1c7a0eSPeter Krystad struct mptcp_addr_info remote; 219b6c08380SGeliang Tang struct list_head anno_list; 2204638de5aSKishen Maloor struct list_head userspace_pm_local_addr_list; 2211b1c7a0eSPeter Krystad 2221b1c7a0eSPeter Krystad spinlock_t lock; /*protects the whole PM data */ 2231b1c7a0eSPeter Krystad 22413ad9f01SGeliang Tang u8 addr_signal; 2251b1c7a0eSPeter Krystad bool server_side; 2261b1c7a0eSPeter Krystad bool work_pending; 2271b1c7a0eSPeter Krystad bool accept_addr; 2281b1c7a0eSPeter Krystad bool accept_subflow; 229df377be3SGeliang Tang bool remote_deny_join_id0; 2301b1c7a0eSPeter Krystad u8 add_addr_signaled; 2311b1c7a0eSPeter Krystad u8 add_addr_accepted; 2321b1c7a0eSPeter Krystad u8 local_addr_used; 233d85a8fdeSMat Martineau u8 pm_type; 2341b1c7a0eSPeter Krystad u8 subflows; 2351b1c7a0eSPeter Krystad u8 status; 23686e39e04SPaolo Abeni DECLARE_BITMAP(id_avail_bitmap, MPTCP_PM_MAX_ADDR_ID + 1); 237cbde2787SGeliang Tang struct mptcp_rm_list rm_list_tx; 238b5c55f33SGeliang Tang struct mptcp_rm_list rm_list_rx; 2391b1c7a0eSPeter Krystad }; 2401b1c7a0eSPeter Krystad 2414638de5aSKishen Maloor struct mptcp_pm_addr_entry { 2424638de5aSKishen Maloor struct list_head list; 2434638de5aSKishen Maloor struct mptcp_addr_info addr; 2444638de5aSKishen Maloor u8 flags; 2454638de5aSKishen Maloor int ifindex; 2464638de5aSKishen Maloor struct socket *lsk; 2474638de5aSKishen Maloor }; 2484638de5aSKishen Maloor 24918b683bfSPaolo Abeni struct mptcp_data_frag { 25018b683bfSPaolo Abeni struct list_head list; 25118b683bfSPaolo Abeni u64 data_seq; 252f0e6a4cfSPaolo Abeni u16 data_len; 253f0e6a4cfSPaolo Abeni u16 offset; 254f0e6a4cfSPaolo Abeni u16 overhead; 255f0e6a4cfSPaolo Abeni u16 already_sent; 25618b683bfSPaolo Abeni struct page *page; 25718b683bfSPaolo Abeni }; 25818b683bfSPaolo Abeni 259f870fa0bSMat Martineau /* MPTCP connection sock */ 260f870fa0bSMat Martineau struct mptcp_sock { 261f870fa0bSMat Martineau /* inet_connection_sock must be the first member */ 262f870fa0bSMat Martineau struct inet_connection_sock sk; 263cec37a6eSPeter Krystad u64 local_key; 264cec37a6eSPeter Krystad u64 remote_key; 2656d0060f6SMat Martineau u64 write_seq; 26638967f42SPaolo Abeni u64 bytes_sent; 267eaa2ffabSPaolo Abeni u64 snd_nxt; 26838967f42SPaolo Abeni u64 bytes_received; 2696d0060f6SMat Martineau u64 ack_seq; 270f3589be0SPaolo Abeni atomic64_t rcv_wnd_sent; 2713721b9b6SMat Martineau u64 rcv_data_fin_seq; 27238967f42SPaolo Abeni u64 bytes_retrans; 2735684ab1aSPaolo Abeni u64 bytes_consumed; 2746511882cSPaolo Abeni int rmem_fwd_alloc; 275d5f49190SPaolo Abeni int snd_burst; 276ea4ca586SPaolo Abeni int old_wspace; 2771e1d9d6fSPaolo Abeni u64 recovery_snd_nxt; /* in recovery mode accept up to this seq; 2781e1d9d6fSPaolo Abeni * recovery related fields are under data_lock 2791e1d9d6fSPaolo Abeni * protection 2801e1d9d6fSPaolo Abeni */ 28138967f42SPaolo Abeni u64 bytes_acked; 2827439d687SPaolo Abeni u64 snd_una; 2837439d687SPaolo Abeni u64 wnd_end; 284b51f9b80SPaolo Abeni unsigned long timer_ival; 28579c0949eSPeter Krystad u32 token; 28687952603SPaolo Abeni int rmem_released; 287648ef4b8SMat Martineau unsigned long flags; 288e9d09bacSPaolo Abeni unsigned long cb_flags; 289e9d09bacSPaolo Abeni unsigned long push_pending; 2901e1d9d6fSPaolo Abeni bool recovery; /* closing subflow write queue reinjected */ 291d22f4988SChristoph Paasch bool can_ack; 292b93df08cSPaolo Abeni bool fully_established; 2933721b9b6SMat Martineau bool rcv_data_fin; 2947279da61SMat Martineau bool snd_data_fin_enable; 29550c504a2SFlorian Westphal bool rcv_fastclose; 29637198e93SDavide Caratti bool use_64bit_ack; /* Set when we received a 64-bit DSN */ 297752e9067SGeliang Tang bool csum_enabled; 2980530020aSGeliang Tang bool allow_infinite_fallback; 2993ad14f54SPaolo Abeni u8 mpc_endpoint_id; 3004f6e14bdSMaxim Galaganov u8 recvmsg_inq:1, 3014f6e14bdSMaxim Galaganov cork:1, 30254f1944eSPaolo Abeni nodelay:1, 303b6985b9bSPaolo Abeni fastopening:1, 30439880bd8SPaolo Abeni in_accept_queue:1, 30539880bd8SPaolo Abeni free_first:1; 30680992017SPaolo Abeni struct work_struct work; 307ab174ad8SPaolo Abeni struct sk_buff *ooo_last_skb; 308ab174ad8SPaolo Abeni struct rb_root out_of_order_queue; 30987952603SPaolo Abeni struct sk_buff_head receive_queue; 310cec37a6eSPeter Krystad struct list_head conn_list; 31118b683bfSPaolo Abeni struct list_head rtx_queue; 312f0e6a4cfSPaolo Abeni struct mptcp_data_frag *first_pending; 313ec3edaa7SPeter Krystad struct list_head join_list; 31439880bd8SPaolo Abeni struct sock *first; /* The mptcp ops can safely dereference, using suitable 3155b825727SPaolo Abeni * ONCE annotation, the subflow outside the socket 3165b825727SPaolo Abeni * lock as such sock is freed after close(). 3175b825727SPaolo Abeni */ 3181b1c7a0eSPeter Krystad struct mptcp_pm_data pm; 3191730b2b2SGeliang Tang struct mptcp_sched_ops *sched; 320a6b118feSFlorian Westphal struct { 321a6b118feSFlorian Westphal u32 space; /* bytes copied in last measurement window */ 322a6b118feSFlorian Westphal u32 copied; /* bytes copied in this measurement window */ 323a6b118feSFlorian Westphal u64 time; /* start time of measurement window */ 324a6b118feSFlorian Westphal u64 rtt_us; /* last maximum rtt of subflows */ 325a6b118feSFlorian Westphal } rcvq_space; 326b8dc6d6cSPaolo Abeni u8 scaling_ratio; 327df00b087SFlorian Westphal 3286f06b4d4SPaolo Abeni u32 subflow_id; 329df00b087SFlorian Westphal u32 setsockopt_seq; 33020b5759fSPaolo Abeni char ca_name[TCP_CA_NAME_MAX]; 331f870fa0bSMat Martineau }; 332f870fa0bSMat Martineau 33387952603SPaolo Abeni #define mptcp_data_lock(sk) spin_lock_bh(&(sk)->sk_lock.slock) 33487952603SPaolo Abeni #define mptcp_data_unlock(sk) spin_unlock_bh(&(sk)->sk_lock.slock) 33587952603SPaolo Abeni 336cec37a6eSPeter Krystad #define mptcp_for_each_subflow(__msk, __subflow) \ 337cec37a6eSPeter Krystad list_for_each_entry(__subflow, &((__msk)->conn_list), node) 3385efbf6f7SMatthieu Baerts #define mptcp_for_each_subflow_safe(__msk, __subflow, __tmp) \ 3395efbf6f7SMatthieu Baerts list_for_each_entry_safe(__subflow, __tmp, &((__msk)->conn_list), node) 340cec37a6eSPeter Krystad 3413abc05d9SFlorian Westphal static inline void msk_owned_by_me(const struct mptcp_sock *msk) 3423abc05d9SFlorian Westphal { 3433abc05d9SFlorian Westphal sock_owned_by_me((const struct sock *)msk); 3443abc05d9SFlorian Westphal } 3453abc05d9SFlorian Westphal 346403a40f2SEric Dumazet #define mptcp_sk(ptr) container_of_const(ptr, struct mptcp_sock, sk.icsk_inet.sk) 347f870fa0bSMat Martineau 348ce599c51SPaolo Abeni /* the msk socket don't use the backlog, also account for the bulk 349ce599c51SPaolo Abeni * free memory 350ce599c51SPaolo Abeni */ 351ce599c51SPaolo Abeni static inline int __mptcp_rmem(const struct sock *sk) 352ce599c51SPaolo Abeni { 353ce599c51SPaolo Abeni return atomic_read(&sk->sk_rmem_alloc) - READ_ONCE(mptcp_sk(sk)->rmem_released); 354ce599c51SPaolo Abeni } 355ce599c51SPaolo Abeni 356b8dc6d6cSPaolo Abeni static inline int mptcp_win_from_space(const struct sock *sk, int space) 357b8dc6d6cSPaolo Abeni { 358b8dc6d6cSPaolo Abeni return __tcp_win_from_space(mptcp_sk(sk)->scaling_ratio, space); 359b8dc6d6cSPaolo Abeni } 360b8dc6d6cSPaolo Abeni 361ea4ca586SPaolo Abeni static inline int __mptcp_space(const struct sock *sk) 362ea4ca586SPaolo Abeni { 363b8dc6d6cSPaolo Abeni return mptcp_win_from_space(sk, READ_ONCE(sk->sk_rcvbuf) - __mptcp_rmem(sk)); 364ea4ca586SPaolo Abeni } 365ea4ca586SPaolo Abeni 366f0e6a4cfSPaolo Abeni static inline struct mptcp_data_frag *mptcp_send_head(const struct sock *sk) 367f0e6a4cfSPaolo Abeni { 368f0e6a4cfSPaolo Abeni const struct mptcp_sock *msk = mptcp_sk(sk); 369f0e6a4cfSPaolo Abeni 370f0e6a4cfSPaolo Abeni return READ_ONCE(msk->first_pending); 371f0e6a4cfSPaolo Abeni } 372f0e6a4cfSPaolo Abeni 373f0e6a4cfSPaolo Abeni static inline struct mptcp_data_frag *mptcp_send_next(struct sock *sk) 374f0e6a4cfSPaolo Abeni { 375f0e6a4cfSPaolo Abeni struct mptcp_sock *msk = mptcp_sk(sk); 376f0e6a4cfSPaolo Abeni struct mptcp_data_frag *cur; 377f0e6a4cfSPaolo Abeni 378f0e6a4cfSPaolo Abeni cur = msk->first_pending; 379f0e6a4cfSPaolo Abeni return list_is_last(&cur->list, &msk->rtx_queue) ? NULL : 380f0e6a4cfSPaolo Abeni list_next_entry(cur, list); 381f0e6a4cfSPaolo Abeni } 382f0e6a4cfSPaolo Abeni 383f0e6a4cfSPaolo Abeni static inline struct mptcp_data_frag *mptcp_pending_tail(const struct sock *sk) 384f0e6a4cfSPaolo Abeni { 385403a40f2SEric Dumazet const struct mptcp_sock *msk = mptcp_sk(sk); 386f0e6a4cfSPaolo Abeni 387f0e6a4cfSPaolo Abeni if (!msk->first_pending) 388f0e6a4cfSPaolo Abeni return NULL; 389f0e6a4cfSPaolo Abeni 390f0e6a4cfSPaolo Abeni if (WARN_ON_ONCE(list_empty(&msk->rtx_queue))) 391f0e6a4cfSPaolo Abeni return NULL; 392f0e6a4cfSPaolo Abeni 393f0e6a4cfSPaolo Abeni return list_last_entry(&msk->rtx_queue, struct mptcp_data_frag, list); 394f0e6a4cfSPaolo Abeni } 395f0e6a4cfSPaolo Abeni 396403a40f2SEric Dumazet static inline struct mptcp_data_frag *mptcp_rtx_head(struct sock *sk) 3977948f6ccSFlorian Westphal { 3987948f6ccSFlorian Westphal struct mptcp_sock *msk = mptcp_sk(sk); 3997948f6ccSFlorian Westphal 40064b9cea7SPaolo Abeni if (msk->snd_una == READ_ONCE(msk->snd_nxt)) 40164b9cea7SPaolo Abeni return NULL; 40264b9cea7SPaolo Abeni 403a386bc5bSGeliang Tang return list_first_entry_or_null(&msk->rtx_queue, struct mptcp_data_frag, list); 4047948f6ccSFlorian Westphal } 4057948f6ccSFlorian Westphal 406d0cc2987SGeliang Tang struct csum_pseudo_header { 407d0cc2987SGeliang Tang __be64 data_seq; 408d0cc2987SGeliang Tang __be32 subflow_seq; 409d0cc2987SGeliang Tang __be16 data_len; 410d0cc2987SGeliang Tang __sum16 csum; 411d0cc2987SGeliang Tang }; 412d0cc2987SGeliang Tang 413cec37a6eSPeter Krystad struct mptcp_subflow_request_sock { 414cec37a6eSPeter Krystad struct tcp_request_sock sk; 415d22f4988SChristoph Paasch u16 mp_capable : 1, 416cec37a6eSPeter Krystad mp_join : 1, 41706fe1719SGeliang Tang backup : 1, 418bab6b88eSGeliang Tang csum_reqd : 1, 419bab6b88eSGeliang Tang allow_join_id0 : 1; 4201b1c7a0eSPeter Krystad u8 local_id; 421f296234cSPeter Krystad u8 remote_id; 422cec37a6eSPeter Krystad u64 local_key; 42379c0949eSPeter Krystad u64 idsn; 42479c0949eSPeter Krystad u32 token; 425648ef4b8SMat Martineau u32 ssn_offset; 426f296234cSPeter Krystad u64 thmac; 427f296234cSPeter Krystad u32 local_nonce; 428f296234cSPeter Krystad u32 remote_nonce; 4298fd4de12SPaolo Abeni struct mptcp_sock *msk; 4302c5ebd00SPaolo Abeni struct hlist_nulls_node token_node; 431cec37a6eSPeter Krystad }; 432cec37a6eSPeter Krystad 433cec37a6eSPeter Krystad static inline struct mptcp_subflow_request_sock * 434cec37a6eSPeter Krystad mptcp_subflow_rsk(const struct request_sock *rsk) 435cec37a6eSPeter Krystad { 436cec37a6eSPeter Krystad return (struct mptcp_subflow_request_sock *)rsk; 437cec37a6eSPeter Krystad } 438cec37a6eSPeter Krystad 439b19bc294SPaolo Abeni struct mptcp_delegated_action { 440b19bc294SPaolo Abeni struct napi_struct napi; 441b19bc294SPaolo Abeni struct list_head head; 442b19bc294SPaolo Abeni }; 443b19bc294SPaolo Abeni 444b19bc294SPaolo Abeni DECLARE_PER_CPU(struct mptcp_delegated_action, mptcp_delegated_actions); 445b19bc294SPaolo Abeni 446a5efdbceSPaolo Abeni #define MPTCP_DELEGATE_SCHEDULED 0 447a5efdbceSPaolo Abeni #define MPTCP_DELEGATE_SEND 1 448a5efdbceSPaolo Abeni #define MPTCP_DELEGATE_ACK 2 4498005184fSPaolo Abeni #define MPTCP_DELEGATE_SNDBUF 3 450b19bc294SPaolo Abeni 451a5efdbceSPaolo 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; 495f1f26512SPaolo Abeni bool 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; 5238005184fSPaolo Abeni int cached_sndbuf; /* sndbuf size when last synced with the msk sndbuf, 5248005184fSPaolo Abeni * protected by the msk socket lock 5258005184fSPaolo Abeni */ 526df00b087SFlorian Westphal 5272303f994SPeter Krystad struct sock *tcp_sock; /* tcp sk backpointer */ 5282303f994SPeter Krystad struct sock *conn; /* parent mptcp_sock */ 529cec37a6eSPeter Krystad const struct inet_connection_sock_af_ops *icsk_af_ops; 530648ef4b8SMat Martineau void (*tcp_state_change)(struct sock *sk); 53115cc1045SPaolo Abeni void (*tcp_error_report)(struct sock *sk); 532648ef4b8SMat Martineau 5332303f994SPeter Krystad struct rcu_head rcu; 5342303f994SPeter Krystad }; 5352303f994SPeter Krystad 5362303f994SPeter Krystad static inline struct mptcp_subflow_context * 5372303f994SPeter Krystad mptcp_subflow_ctx(const struct sock *sk) 5382303f994SPeter Krystad { 5392303f994SPeter Krystad struct inet_connection_sock *icsk = inet_csk(sk); 5402303f994SPeter Krystad 5412303f994SPeter Krystad /* Use RCU on icsk_ulp_data only for sock diag code */ 5422303f994SPeter Krystad return (__force struct mptcp_subflow_context *)icsk->icsk_ulp_data; 5432303f994SPeter Krystad } 5442303f994SPeter Krystad 5452303f994SPeter Krystad static inline struct sock * 5462303f994SPeter Krystad mptcp_subflow_tcp_sock(const struct mptcp_subflow_context *subflow) 5472303f994SPeter Krystad { 5482303f994SPeter Krystad return subflow->tcp_sock; 5492303f994SPeter Krystad } 5502303f994SPeter Krystad 551b29fcfb5SPaolo Abeni static inline void 552b29fcfb5SPaolo Abeni mptcp_subflow_ctx_reset(struct mptcp_subflow_context *subflow) 553b29fcfb5SPaolo Abeni { 55463ec72bdSKees Cook memset(&subflow->reset, 0, sizeof(subflow->reset)); 555b29fcfb5SPaolo Abeni subflow->request_mptcp = 1; 556b29fcfb5SPaolo Abeni } 557b29fcfb5SPaolo Abeni 558648ef4b8SMat Martineau static inline u64 559648ef4b8SMat Martineau mptcp_subflow_get_map_offset(const struct mptcp_subflow_context *subflow) 560648ef4b8SMat Martineau { 561648ef4b8SMat Martineau return tcp_sk(mptcp_subflow_tcp_sock(subflow))->copied_seq - 562648ef4b8SMat Martineau subflow->ssn_offset - 563648ef4b8SMat Martineau subflow->map_subflow_seq; 564648ef4b8SMat Martineau } 565648ef4b8SMat Martineau 566648ef4b8SMat Martineau static inline u64 567648ef4b8SMat Martineau mptcp_subflow_get_mapped_dsn(const struct mptcp_subflow_context *subflow) 568648ef4b8SMat Martineau { 569648ef4b8SMat Martineau return subflow->map_seq + mptcp_subflow_get_map_offset(subflow); 570648ef4b8SMat Martineau } 571648ef4b8SMat Martineau 572a5efdbceSPaolo Abeni void mptcp_subflow_process_delegated(struct sock *ssk, long actions); 573b19bc294SPaolo Abeni 574bcd97734SPaolo Abeni static inline void mptcp_subflow_delegate(struct mptcp_subflow_context *subflow, int action) 575b19bc294SPaolo Abeni { 576a5efdbceSPaolo Abeni long old, set_bits = BIT(MPTCP_DELEGATE_SCHEDULED) | BIT(action); 577b19bc294SPaolo Abeni struct mptcp_delegated_action *delegated; 578b19bc294SPaolo Abeni bool schedule; 579b19bc294SPaolo Abeni 580bcd97734SPaolo Abeni /* the caller held the subflow bh socket lock */ 581bcd97734SPaolo Abeni lockdep_assert_in_softirq(); 582bcd97734SPaolo Abeni 583a5efdbceSPaolo Abeni /* The implied barrier pairs with tcp_release_cb_override() 584a5efdbceSPaolo Abeni * mptcp_napi_poll(), and ensures the below list check sees list 585a5efdbceSPaolo Abeni * updates done prior to delegated status bits changes 586b19bc294SPaolo Abeni */ 587a5efdbceSPaolo Abeni old = set_mask_bits(&subflow->delegated_status, 0, set_bits); 588a5efdbceSPaolo Abeni if (!(old & BIT(MPTCP_DELEGATE_SCHEDULED))) { 589a5efdbceSPaolo Abeni if (WARN_ON_ONCE(!list_empty(&subflow->delegated_node))) 590b19bc294SPaolo Abeni return; 591b19bc294SPaolo Abeni 592b19bc294SPaolo Abeni delegated = this_cpu_ptr(&mptcp_delegated_actions); 593b19bc294SPaolo Abeni schedule = list_empty(&delegated->head); 594b19bc294SPaolo Abeni list_add_tail(&subflow->delegated_node, &delegated->head); 595b19bc294SPaolo Abeni sock_hold(mptcp_subflow_tcp_sock(subflow)); 596b19bc294SPaolo Abeni if (schedule) 597b19bc294SPaolo Abeni napi_schedule(&delegated->napi); 598b19bc294SPaolo Abeni } 599b19bc294SPaolo Abeni } 600b19bc294SPaolo Abeni 601b19bc294SPaolo Abeni static inline struct mptcp_subflow_context * 602b19bc294SPaolo Abeni mptcp_subflow_delegated_next(struct mptcp_delegated_action *delegated) 603b19bc294SPaolo Abeni { 604b19bc294SPaolo Abeni struct mptcp_subflow_context *ret; 605b19bc294SPaolo Abeni 606b19bc294SPaolo Abeni if (list_empty(&delegated->head)) 607b19bc294SPaolo Abeni return NULL; 608b19bc294SPaolo Abeni 609b19bc294SPaolo Abeni ret = list_first_entry(&delegated->head, struct mptcp_subflow_context, delegated_node); 610b19bc294SPaolo Abeni list_del_init(&ret->delegated_node); 611b19bc294SPaolo Abeni return ret; 612b19bc294SPaolo Abeni } 613b19bc294SPaolo Abeni 6146da14d74SPaolo Abeni int mptcp_is_enabled(const struct net *net); 6156da14d74SPaolo Abeni unsigned int mptcp_get_add_addr_timeout(const struct net *net); 6166da14d74SPaolo Abeni int mptcp_is_checksum_enabled(const struct net *net); 6176da14d74SPaolo Abeni int mptcp_allow_join_id0(const struct net *net); 618ff5a0b42SPaolo Abeni unsigned int mptcp_stale_loss_cnt(const struct net *net); 619d866ae9aSPaolo Abeni unsigned int mptcp_close_timeout(const struct sock *sk); 6206bb63cccSMat Martineau int mptcp_get_pm_type(const struct net *net); 621e3b2870bSGeliang Tang const char *mptcp_get_scheduler(const struct net *net); 622b93df08cSPaolo Abeni void mptcp_subflow_fully_established(struct mptcp_subflow_context *subflow, 623b3ea6b27SPaolo Abeni const struct mptcp_options_received *mp_opt); 6241e1d9d6fSPaolo Abeni bool __mptcp_retransmit_pending_data(struct sock *sk); 6258b38217aSMaxim Galaganov void mptcp_check_and_set_pending(struct sock *sk); 626ff5a0b42SPaolo Abeni void __mptcp_push_pending(struct sock *sk, unsigned int flags); 627648ef4b8SMat Martineau bool mptcp_subflow_data_available(struct sock *sk); 628d39dcecaSPaolo Abeni void __init mptcp_subflow_init(void); 629d0876b22SGeliang Tang void mptcp_subflow_shutdown(struct sock *sk, struct sock *ssk, int how); 630a141e02eSFlorian Westphal void mptcp_close_ssk(struct sock *sk, struct sock *ssk, 631e16163b6SPaolo Abeni struct mptcp_subflow_context *subflow); 632a6574302SMat Martineau void __mptcp_subflow_send_ack(struct sock *ssk); 633d5824847SPaolo Abeni void mptcp_subflow_reset(struct sock *ssk); 6342a6a870eSPaolo Abeni void mptcp_subflow_queue_clean(struct sock *sk, struct sock *ssk); 635866f26f2SPaolo Abeni void mptcp_sock_graft(struct sock *sk, struct socket *parent); 6363f326a82SPaolo Abeni struct sock *__mptcp_nmpc_sk(struct mptcp_sock *msk); 63726d3e21cSMenglong Dong bool __mptcp_close(struct sock *sk, long timeout); 63830e51b92SMenglong Dong void mptcp_cancel_work(struct sock *sk); 63963740448SPaolo Abeni void __mptcp_unaccepted_force_close(struct sock *sk); 64036b122baSDmytro Shytyi void mptcp_set_owner_r(struct sk_buff *skb, struct sock *sk); 641ec3edaa7SPeter Krystad 6424638de5aSKishen Maloor bool mptcp_addresses_equal(const struct mptcp_addr_info *a, 6434638de5aSKishen Maloor const struct mptcp_addr_info *b, bool use_port); 644dc886bceSGeliang Tang void mptcp_local_address(const struct sock_common *skc, struct mptcp_addr_info *addr); 6454638de5aSKishen Maloor 646ec3edaa7SPeter Krystad /* called with sk socket lock held */ 647ef0da3b8SPaolo Abeni int __mptcp_subflow_connect(struct sock *sk, const struct mptcp_addr_info *loc, 648ee285257SGeliang Tang const struct mptcp_addr_info *remote); 6496bc1fe7dSPaolo Abeni int mptcp_subflow_create_socket(struct sock *sk, unsigned short family, 6506bc1fe7dSPaolo Abeni struct socket **new_sock); 6511729cf18SGeliang Tang void mptcp_info2sockaddr(const struct mptcp_addr_info *info, 6521729cf18SGeliang Tang struct sockaddr_storage *addr, 6531729cf18SGeliang Tang unsigned short family); 654740ebe35SGeliang Tang struct mptcp_sched_ops *mptcp_sched_find(const char *name); 655740ebe35SGeliang Tang int mptcp_register_scheduler(struct mptcp_sched_ops *sched); 656740ebe35SGeliang Tang void mptcp_unregister_scheduler(struct mptcp_sched_ops *sched); 657ed1ad86bSGeliang Tang void mptcp_sched_init(void); 6581730b2b2SGeliang Tang int mptcp_init_sched(struct mptcp_sock *msk, 6591730b2b2SGeliang Tang struct mptcp_sched_ops *sched); 6601730b2b2SGeliang Tang void mptcp_release_sched(struct mptcp_sock *msk); 661fce68b03SGeliang Tang void mptcp_subflow_set_scheduled(struct mptcp_subflow_context *subflow, 662fce68b03SGeliang Tang bool scheduled); 66307336a87SGeliang Tang struct sock *mptcp_subflow_get_send(struct mptcp_sock *msk); 66407336a87SGeliang Tang struct sock *mptcp_subflow_get_retrans(struct mptcp_sock *msk); 66507336a87SGeliang Tang int mptcp_sched_get_send(struct mptcp_sock *msk); 66607336a87SGeliang Tang int mptcp_sched_get_retrans(struct mptcp_sock *msk); 6672303f994SPeter Krystad 6685684ab1aSPaolo Abeni static inline u64 mptcp_data_avail(const struct mptcp_sock *msk) 6695684ab1aSPaolo Abeni { 6705684ab1aSPaolo Abeni return READ_ONCE(msk->bytes_received) - READ_ONCE(msk->bytes_consumed); 6715684ab1aSPaolo Abeni } 6725684ab1aSPaolo Abeni 6735684ab1aSPaolo Abeni static inline bool mptcp_epollin_ready(const struct sock *sk) 6745684ab1aSPaolo Abeni { 6755684ab1aSPaolo Abeni /* mptcp doesn't have to deal with small skbs in the receive queue, 6765684ab1aSPaolo Abeni * at it can always coalesce them 6775684ab1aSPaolo Abeni */ 6785684ab1aSPaolo Abeni return (mptcp_data_avail(mptcp_sk(sk)) >= sk->sk_rcvlowat) || 6795684ab1aSPaolo Abeni (mem_cgroup_sockets_enabled && sk->sk_memcg && 6805684ab1aSPaolo Abeni mem_cgroup_under_socket_pressure(sk->sk_memcg)) || 6815684ab1aSPaolo Abeni READ_ONCE(tcp_memory_pressure); 6825684ab1aSPaolo Abeni } 6835684ab1aSPaolo Abeni 6845684ab1aSPaolo Abeni int mptcp_set_rcvlowat(struct sock *sk, int val); 6855684ab1aSPaolo Abeni 686c886d702SPaolo Abeni static inline bool __tcp_can_send(const struct sock *ssk) 687c886d702SPaolo Abeni { 688c886d702SPaolo Abeni /* only send if our side has not closed yet */ 689c886d702SPaolo Abeni return ((1 << inet_sk_state_load(ssk)) & (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT)); 690c886d702SPaolo Abeni } 691c886d702SPaolo Abeni 692ff5a0b42SPaolo Abeni static inline bool __mptcp_subflow_active(struct mptcp_subflow_context *subflow) 69343f1140bSGeliang Tang { 69443f1140bSGeliang Tang /* can't send if JOIN hasn't completed yet (i.e. is usable for mptcp) */ 69543f1140bSGeliang Tang if (subflow->request_join && !subflow->fully_established) 69643f1140bSGeliang Tang return false; 69743f1140bSGeliang Tang 698c886d702SPaolo Abeni return __tcp_can_send(mptcp_subflow_tcp_sock(subflow)); 69943f1140bSGeliang Tang } 70043f1140bSGeliang Tang 701ff5a0b42SPaolo Abeni void mptcp_subflow_set_active(struct mptcp_subflow_context *subflow); 702ff5a0b42SPaolo Abeni 703ff5a0b42SPaolo Abeni bool mptcp_subflow_active(struct mptcp_subflow_context *subflow); 704ff5a0b42SPaolo Abeni 705b6985b9bSPaolo Abeni void mptcp_subflow_drop_ctx(struct sock *ssk); 706b6985b9bSPaolo Abeni 707648ef4b8SMat Martineau static inline void mptcp_subflow_tcp_fallback(struct sock *sk, 708648ef4b8SMat Martineau struct mptcp_subflow_context *ctx) 709648ef4b8SMat Martineau { 710952382c6SFlorian Westphal sk->sk_data_ready = sock_def_readable; 711648ef4b8SMat Martineau sk->sk_state_change = ctx->tcp_state_change; 712952382c6SFlorian Westphal sk->sk_write_space = sk_stream_write_space; 71315cc1045SPaolo Abeni sk->sk_error_report = ctx->tcp_error_report; 714648ef4b8SMat Martineau 715648ef4b8SMat Martineau inet_csk(sk)->icsk_af_ops = ctx->icsk_af_ops; 716648ef4b8SMat Martineau } 717648ef4b8SMat Martineau 718d39dcecaSPaolo Abeni void __init mptcp_proto_init(void); 719784325e9SMatthieu Baerts #if IS_ENABLED(CONFIG_MPTCP_IPV6) 720d39dcecaSPaolo Abeni int __init mptcp_proto_v6_init(void); 721784325e9SMatthieu Baerts #endif 722648ef4b8SMat Martineau 7237e8b88ecSPaolo Abeni struct sock *mptcp_sk_clone_init(const struct sock *sk, 724cfde141eSPaolo Abeni const struct mptcp_options_received *mp_opt, 7257e8b88ecSPaolo Abeni struct sock *ssk, 726fca5c82cSPaolo Abeni struct request_sock *req); 7270799e21bSGeliang Tang void mptcp_get_options(const struct sk_buff *skb, 728cfde141eSPaolo Abeni struct mptcp_options_received *mp_opt); 729cec37a6eSPeter Krystad 730cec37a6eSPeter Krystad void mptcp_finish_connect(struct sock *sk); 731490274b4SPaolo Abeni void __mptcp_set_connected(struct sock *sk); 732f6909dc1SPaolo Abeni void mptcp_reset_tout_timer(struct mptcp_sock *msk, unsigned long fail_tout); 73327e5ccc2SPaolo Abeni 73427e5ccc2SPaolo Abeni static inline void mptcp_stop_tout_timer(struct sock *sk) 73527e5ccc2SPaolo Abeni { 73627e5ccc2SPaolo Abeni if (!inet_csk(sk)->icsk_mtup.probe_timestamp) 73727e5ccc2SPaolo Abeni return; 73827e5ccc2SPaolo Abeni 73927e5ccc2SPaolo Abeni sk_stop_timer(sk, &sk->sk_timer); 74027e5ccc2SPaolo Abeni inet_csk(sk)->icsk_mtup.probe_timestamp = 0; 74127e5ccc2SPaolo Abeni } 74227e5ccc2SPaolo Abeni 74327e5ccc2SPaolo Abeni static inline void mptcp_set_close_tout(struct sock *sk, unsigned long tout) 74427e5ccc2SPaolo Abeni { 74527e5ccc2SPaolo Abeni /* avoid 0 timestamp, as that means no close timeout */ 74627e5ccc2SPaolo Abeni inet_csk(sk)->icsk_mtup.probe_timestamp = tout ? : 1; 74727e5ccc2SPaolo Abeni } 74827e5ccc2SPaolo Abeni 74927e5ccc2SPaolo Abeni static inline void mptcp_start_tout_timer(struct sock *sk) 75027e5ccc2SPaolo Abeni { 75127e5ccc2SPaolo Abeni mptcp_set_close_tout(sk, tcp_jiffies32); 75227e5ccc2SPaolo Abeni mptcp_reset_tout_timer(mptcp_sk(sk), 0); 75327e5ccc2SPaolo Abeni } 75427e5ccc2SPaolo Abeni 755b93df08cSPaolo Abeni static inline bool mptcp_is_fully_established(struct sock *sk) 756b93df08cSPaolo Abeni { 757b93df08cSPaolo Abeni return inet_sk_state_load(sk) == TCP_ESTABLISHED && 758b93df08cSPaolo Abeni READ_ONCE(mptcp_sk(sk)->fully_established); 759b93df08cSPaolo Abeni } 7605684ab1aSPaolo Abeni 761a6b118feSFlorian Westphal void mptcp_rcv_space_init(struct mptcp_sock *msk, const struct sock *ssk); 7622e52213cSFlorian Westphal void mptcp_data_ready(struct sock *sk, struct sock *ssk); 763f296234cSPeter Krystad bool mptcp_finish_join(struct sock *sk); 764ba8f48f7SPaolo Abeni bool mptcp_schedule_work(struct sock *sk); 7650abdde82SPaolo Abeni int mptcp_setsockopt(struct sock *sk, int level, int optname, 7660abdde82SPaolo Abeni sockptr_t optval, unsigned int optlen); 7670abdde82SPaolo Abeni int mptcp_getsockopt(struct sock *sk, int level, int optname, 7680abdde82SPaolo Abeni char __user *optval, int __user *option); 7690abdde82SPaolo Abeni 7701502328fSPaolo Abeni u64 __mptcp_expand_seq(u64 old_seq, u64 cur_seq); 7711502328fSPaolo Abeni static inline u64 mptcp_expand_seq(u64 old_seq, u64 cur_seq, bool use_64bit) 7721502328fSPaolo Abeni { 7731502328fSPaolo Abeni if (use_64bit) 7741502328fSPaolo Abeni return cur_seq; 7751502328fSPaolo Abeni 7761502328fSPaolo Abeni return __mptcp_expand_seq(old_seq, cur_seq); 7771502328fSPaolo Abeni } 778219d0499SPaolo Abeni void __mptcp_check_push(struct sock *sk, struct sock *ssk); 7797439d687SPaolo Abeni void __mptcp_data_acked(struct sock *sk); 78015cc1045SPaolo Abeni void __mptcp_error_report(struct sock *sk); 7811a49b2c2SMat Martineau bool mptcp_update_rcv_data_fin(struct mptcp_sock *msk, u64 data_fin_seq, bool use_64bit); 782e16163b6SPaolo Abeni static inline bool mptcp_data_fin_enabled(const struct mptcp_sock *msk) 783e16163b6SPaolo Abeni { 784e16163b6SPaolo Abeni return READ_ONCE(msk->snd_data_fin_enable) && 785e16163b6SPaolo Abeni READ_ONCE(msk->write_seq) == READ_ONCE(msk->snd_nxt); 786e16163b6SPaolo Abeni } 787e16163b6SPaolo Abeni 7888005184fSPaolo Abeni static inline void __mptcp_sync_sndbuf(struct sock *sk) 7895cf92bbaSPaolo Abeni { 7908005184fSPaolo Abeni struct mptcp_subflow_context *subflow; 7918005184fSPaolo Abeni int ssk_sndbuf, new_sndbuf; 7925cf92bbaSPaolo Abeni 7938005184fSPaolo Abeni if (sk->sk_userlocks & SOCK_SNDBUF_LOCK) 7948005184fSPaolo Abeni return; 7958005184fSPaolo Abeni 7968005184fSPaolo Abeni new_sndbuf = sock_net(sk)->ipv4.sysctl_tcp_wmem[0]; 7978005184fSPaolo Abeni mptcp_for_each_subflow(mptcp_sk(sk), subflow) { 7988005184fSPaolo Abeni ssk_sndbuf = READ_ONCE(mptcp_subflow_tcp_sock(subflow)->sk_sndbuf); 7998005184fSPaolo Abeni 8008005184fSPaolo Abeni subflow->cached_sndbuf = ssk_sndbuf; 8018005184fSPaolo Abeni new_sndbuf += ssk_sndbuf; 8028005184fSPaolo Abeni } 8038005184fSPaolo Abeni 8048005184fSPaolo Abeni /* the msk max wmem limit is <nr_subflows> * tcp wmem[2] */ 8058005184fSPaolo Abeni WRITE_ONCE(sk->sk_sndbuf, new_sndbuf); 8068005184fSPaolo Abeni } 8078005184fSPaolo Abeni 8088005184fSPaolo Abeni /* The called held both the msk socket and the subflow socket locks, 8098005184fSPaolo Abeni * possibly under BH 8108005184fSPaolo Abeni */ 8118005184fSPaolo Abeni static inline void __mptcp_propagate_sndbuf(struct sock *sk, struct sock *ssk) 8128005184fSPaolo Abeni { 8138005184fSPaolo Abeni struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); 8148005184fSPaolo Abeni 8158005184fSPaolo Abeni if (READ_ONCE(ssk->sk_sndbuf) != subflow->cached_sndbuf) 8168005184fSPaolo Abeni __mptcp_sync_sndbuf(sk); 8178005184fSPaolo Abeni } 8188005184fSPaolo Abeni 8198005184fSPaolo Abeni /* the caller held only the subflow socket lock, either in process or 8208005184fSPaolo Abeni * BH context. Additionally this can be called under the msk data lock, 8218005184fSPaolo Abeni * so we can't acquire such lock here: let the delegate action acquires 8228005184fSPaolo Abeni * the needed locks in suitable order. 8238005184fSPaolo Abeni */ 8248005184fSPaolo Abeni static inline void mptcp_propagate_sndbuf(struct sock *sk, struct sock *ssk) 8258005184fSPaolo Abeni { 8268005184fSPaolo Abeni struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); 8278005184fSPaolo Abeni 8288005184fSPaolo Abeni if (likely(READ_ONCE(ssk->sk_sndbuf) == subflow->cached_sndbuf)) 8298005184fSPaolo Abeni return; 8308005184fSPaolo Abeni 8318005184fSPaolo Abeni local_bh_disable(); 8328005184fSPaolo Abeni mptcp_subflow_delegate(subflow, MPTCP_DELEGATE_SNDBUF); 8338005184fSPaolo Abeni local_bh_enable(); 8345cf92bbaSPaolo Abeni } 8355cf92bbaSPaolo Abeni 8365cf92bbaSPaolo Abeni static inline void mptcp_write_space(struct sock *sk) 8375cf92bbaSPaolo Abeni { 8385cf92bbaSPaolo Abeni if (sk_stream_is_writeable(sk)) { 8395cf92bbaSPaolo Abeni /* pairs with memory barrier in mptcp_poll */ 8405cf92bbaSPaolo Abeni smp_mb(); 8415cf92bbaSPaolo Abeni if (test_and_clear_bit(MPTCP_NOSPACE, &mptcp_sk(sk)->flags)) 8425cf92bbaSPaolo Abeni sk_stream_write_space(sk); 8435cf92bbaSPaolo Abeni } 8445cf92bbaSPaolo Abeni } 8455cf92bbaSPaolo Abeni 846c0bf3c6aSPaolo Abeni void mptcp_destroy_common(struct mptcp_sock *msk, unsigned int flags); 847cec37a6eSPeter Krystad 848c68a0cd1SJianguo Wu #define MPTCP_TOKEN_MAX_RETRIES 4 849c68a0cd1SJianguo Wu 8502c5ebd00SPaolo Abeni void __init mptcp_token_init(void); 8512c5ebd00SPaolo Abeni static inline void mptcp_token_init_request(struct request_sock *req) 8522c5ebd00SPaolo Abeni { 8532c5ebd00SPaolo Abeni mptcp_subflow_rsk(req)->token_node.pprev = NULL; 8542c5ebd00SPaolo Abeni } 8552c5ebd00SPaolo Abeni 85679c0949eSPeter Krystad int mptcp_token_new_request(struct request_sock *req); 8572c5ebd00SPaolo Abeni void mptcp_token_destroy_request(struct request_sock *req); 858294de909SMenglong Dong int mptcp_token_new_connect(struct sock *ssk); 8592c5ebd00SPaolo Abeni void mptcp_token_accept(struct mptcp_subflow_request_sock *r, 8602c5ebd00SPaolo Abeni struct mptcp_sock *msk); 861c83a47e5SFlorian Westphal bool mptcp_token_exists(u32 token); 862ea1300b9SFlorian Westphal struct mptcp_sock *mptcp_token_get_sock(struct net *net, u32 token); 86396d890daSPaolo Abeni struct mptcp_sock *mptcp_token_iter_next(const struct net *net, long *s_slot, 86496d890daSPaolo Abeni long *s_num); 8652c5ebd00SPaolo Abeni void mptcp_token_destroy(struct mptcp_sock *msk); 86679c0949eSPeter Krystad 86779c0949eSPeter Krystad void mptcp_crypto_key_sha(u64 key, u32 *token, u64 *idsn); 86879c0949eSPeter Krystad 8693df523abSPeter Krystad void mptcp_crypto_hmac_sha(u64 key1, u64 key2, u8 *msg, int len, void *hmac); 870ba2c89e0SPaolo Abeni __sum16 __mptcp_make_csum(u64 data_seq, u32 subflow_seq, u16 data_len, __wsum sum); 87179c0949eSPeter Krystad 872d39dcecaSPaolo Abeni void __init mptcp_pm_init(void); 8731b1c7a0eSPeter Krystad void mptcp_pm_data_init(struct mptcp_sock *msk); 874b29fcfb5SPaolo Abeni void mptcp_pm_data_reset(struct mptcp_sock *msk); 875702c2f64SFlorian Westphal int mptcp_pm_parse_addr(struct nlattr *attr, struct genl_info *info, 876702c2f64SFlorian Westphal struct mptcp_addr_info *addr); 8779ab4807cSKishen Maloor int mptcp_pm_parse_entry(struct nlattr *attr, struct genl_info *info, 8789ab4807cSKishen Maloor bool require_family, 8799ab4807cSKishen Maloor struct mptcp_pm_addr_entry *entry); 880fb00ee4fSMatthieu Baerts bool mptcp_pm_addr_families_match(const struct sock *sk, 881fb00ee4fSMatthieu Baerts const struct mptcp_addr_info *loc, 882fb00ee4fSMatthieu Baerts const struct mptcp_addr_info *rem); 88371b7dec2SPaolo Abeni void mptcp_pm_subflow_chk_stale(const struct mptcp_sock *msk, struct sock *ssk); 884ff5a0b42SPaolo Abeni void mptcp_pm_nl_subflow_chk_stale(const struct mptcp_sock *msk, struct sock *ssk); 8856c714f1bSFlorian Westphal void mptcp_pm_new_connection(struct mptcp_sock *msk, const struct sock *ssk, int server_side); 8867a486c44SPaolo Abeni void mptcp_pm_fully_established(struct mptcp_sock *msk, const struct sock *ssk); 8871b1c7a0eSPeter Krystad bool mptcp_pm_allow_new_subflow(struct mptcp_sock *msk); 8881b1c7a0eSPeter Krystad void mptcp_pm_connection_closed(struct mptcp_sock *msk); 88962535200SGeliang Tang void mptcp_pm_subflow_established(struct mptcp_sock *msk); 890a88c9e49SPaolo Abeni bool mptcp_pm_nl_check_work_pending(struct mptcp_sock *msk); 89174cbb0c6SGeliang Tang void mptcp_pm_subflow_check_next(struct mptcp_sock *msk, 892a88c9e49SPaolo Abeni const struct mptcp_subflow_context *subflow); 893d1ace2d9SKishen Maloor void mptcp_pm_add_addr_received(const struct sock *ssk, 8941b1c7a0eSPeter Krystad const struct mptcp_addr_info *addr); 895557963c3SGeliang Tang void mptcp_pm_add_addr_echoed(struct mptcp_sock *msk, 89690d93088SPaolo Abeni const struct mptcp_addr_info *addr); 89784dfe367SGeliang Tang void mptcp_pm_add_addr_send_ack(struct mptcp_sock *msk); 898b46a0238SGeliang Tang void mptcp_pm_nl_addr_send_ack(struct mptcp_sock *msk); 8995c4a824dSGeliang Tang void mptcp_pm_rm_addr_received(struct mptcp_sock *msk, 9005c4a824dSGeliang Tang const struct mptcp_rm_list *rm_list); 90140453a5cSGeliang Tang void mptcp_pm_mp_prio_received(struct sock *sk, u8 bkup); 9025580d41bSGeliang Tang void mptcp_pm_mp_fail_received(struct sock *sk, u64 fail_seq); 903892f396cSKishen Maloor int mptcp_pm_nl_mp_prio_send_ack(struct mptcp_sock *msk, 904892f396cSKishen Maloor struct mptcp_addr_info *addr, 905892f396cSKishen Maloor struct mptcp_addr_info *rem, 906892f396cSKishen Maloor u8 bkup); 9079ab4807cSKishen Maloor bool mptcp_pm_alloc_anno_list(struct mptcp_sock *msk, 908528cb5f2SGeliang Tang const struct mptcp_addr_info *addr); 909b6c08380SGeliang Tang void mptcp_pm_free_anno_list(struct mptcp_sock *msk); 9105bc56388SGeliang Tang bool mptcp_pm_sport_in_anno_list(struct mptcp_sock *msk, const struct sock *sk); 91100cfd77bSGeliang Tang struct mptcp_pm_add_entry * 91200cfd77bSGeliang Tang mptcp_pm_del_add_timer(struct mptcp_sock *msk, 91390d93088SPaolo Abeni const struct mptcp_addr_info *addr, bool check_id); 914d88c476fSGeliang Tang struct mptcp_pm_add_entry * 91590d93088SPaolo Abeni mptcp_lookup_anno_list_by_saddr(const struct mptcp_sock *msk, 91690d93088SPaolo Abeni const struct mptcp_addr_info *addr); 9178b201370SKishen Maloor int mptcp_pm_get_flags_and_ifindex_by_id(struct mptcp_sock *msk, 9188b201370SKishen Maloor unsigned int id, 9198b201370SKishen Maloor u8 *flags, int *ifindex); 920f40be0dbSGeliang Tang int mptcp_pm_nl_get_flags_and_ifindex_by_id(struct mptcp_sock *msk, unsigned int id, 921f40be0dbSGeliang Tang u8 *flags, int *ifindex); 9228b201370SKishen Maloor int mptcp_userspace_pm_get_flags_and_ifindex_by_id(struct mptcp_sock *msk, 9238b201370SKishen Maloor unsigned int id, 924ee285257SGeliang Tang u8 *flags, int *ifindex); 9256ba7ce89SGeliang Tang int mptcp_pm_set_flags(struct net *net, struct nlattr *token, 9266ba7ce89SGeliang Tang struct mptcp_pm_addr_entry *loc, 9276ba7ce89SGeliang Tang struct mptcp_pm_addr_entry *rem, u8 bkup); 9286ba7ce89SGeliang Tang int mptcp_pm_nl_set_flags(struct net *net, struct mptcp_pm_addr_entry *addr, u8 bkup); 929892f396cSKishen Maloor int mptcp_userspace_pm_set_flags(struct net *net, struct nlattr *token, 930892f396cSKishen Maloor struct mptcp_pm_addr_entry *loc, 931892f396cSKishen Maloor struct mptcp_pm_addr_entry *rem, u8 bkup); 9321b1c7a0eSPeter Krystad int mptcp_pm_announce_addr(struct mptcp_sock *msk, 9336a6c05a8SGeliang Tang const struct mptcp_addr_info *addr, 934f7efc777SGeliang Tang bool echo); 935cbde2787SGeliang Tang int mptcp_pm_remove_addr(struct mptcp_sock *msk, const struct mptcp_rm_list *rm_list); 936ddd14bb8SGeliang Tang int mptcp_pm_remove_subflow(struct mptcp_sock *msk, const struct mptcp_rm_list *rm_list); 9378b1c94daSGeliang Tang void mptcp_pm_remove_addrs(struct mptcp_sock *msk, struct list_head *rm_list); 938d9a4594eSKishen Maloor void mptcp_pm_remove_addrs_and_subflows(struct mptcp_sock *msk, 939d9a4594eSKishen Maloor struct list_head *rm_list); 940d9a4594eSKishen Maloor 9414638de5aSKishen Maloor void mptcp_free_local_addr_list(struct mptcp_sock *msk); 9421b1c7a0eSPeter Krystad 943b911c97cSFlorian Westphal void mptcp_event(enum mptcp_event_type type, const struct mptcp_sock *msk, 944b911c97cSFlorian Westphal const struct sock *ssk, gfp_t gfp); 945d1ace2d9SKishen Maloor void mptcp_event_addr_announced(const struct sock *ssk, const struct mptcp_addr_info *info); 946b911c97cSFlorian Westphal void mptcp_event_addr_removed(const struct mptcp_sock *msk, u8 id); 947f8c9dfbdSGeliang Tang void mptcp_event_pm_listener(const struct sock *ssk, 948f8c9dfbdSGeliang Tang enum mptcp_event_type event); 9494d25247dSKishen Maloor bool mptcp_userspace_pm_active(const struct mptcp_sock *msk); 950b911c97cSFlorian Westphal 951dfc8d060SDmytro Shytyi void mptcp_fastopen_gen_msk_ackseq(struct mptcp_sock *msk, struct mptcp_subflow_context *subflow, 952dfc8d060SDmytro Shytyi const struct mptcp_options_received *mp_opt); 95336b122baSDmytro Shytyi void mptcp_fastopen_subflow_synack_set_params(struct mptcp_subflow_context *subflow, 95436b122baSDmytro Shytyi struct request_sock *req); 955dfc8d060SDmytro Shytyi 956f643b803SGeliang Tang static inline bool mptcp_pm_should_add_signal(struct mptcp_sock *msk) 9571b1c7a0eSPeter Krystad { 95818fc1a92SYonglong Li return READ_ONCE(msk->pm.addr_signal) & 95918fc1a92SYonglong Li (BIT(MPTCP_ADD_ADDR_SIGNAL) | BIT(MPTCP_ADD_ADDR_ECHO)); 96018fc1a92SYonglong Li } 96118fc1a92SYonglong Li 96218fc1a92SYonglong Li static inline bool mptcp_pm_should_add_signal_addr(struct mptcp_sock *msk) 96318fc1a92SYonglong Li { 96413ad9f01SGeliang Tang return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_SIGNAL); 965d91d322aSGeliang Tang } 966d91d322aSGeliang Tang 967d91d322aSGeliang Tang static inline bool mptcp_pm_should_add_signal_echo(struct mptcp_sock *msk) 968d91d322aSGeliang Tang { 96913ad9f01SGeliang Tang return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_ECHO); 9701b1c7a0eSPeter Krystad } 9711b1c7a0eSPeter Krystad 9725cb104aeSGeliang Tang static inline bool mptcp_pm_should_rm_signal(struct mptcp_sock *msk) 9735cb104aeSGeliang Tang { 97413ad9f01SGeliang Tang return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_RM_ADDR_SIGNAL); 9755cb104aeSGeliang Tang } 9765cb104aeSGeliang Tang 97714b06811SMat Martineau static inline bool mptcp_pm_is_userspace(const struct mptcp_sock *msk) 97814b06811SMat Martineau { 97914b06811SMat Martineau return READ_ONCE(msk->pm.pm_type) == MPTCP_PM_TYPE_USERSPACE; 98014b06811SMat Martineau } 98114b06811SMat Martineau 9824d25247dSKishen Maloor static inline bool mptcp_pm_is_kernel(const struct mptcp_sock *msk) 9834d25247dSKishen Maloor { 9844d25247dSKishen Maloor return READ_ONCE(msk->pm.pm_type) == MPTCP_PM_TYPE_KERNEL; 9854d25247dSKishen Maloor } 9864d25247dSKishen Maloor 9874a2777a8SGeliang Tang static inline unsigned int mptcp_add_addr_len(int family, bool echo, bool port) 9881b1c7a0eSPeter Krystad { 9892ec72faeSGeliang Tang u8 len = TCPOLEN_MPTCP_ADD_ADDR_BASE; 9902ec72faeSGeliang Tang 9912ec72faeSGeliang Tang if (family == AF_INET6) 9922ec72faeSGeliang Tang len = TCPOLEN_MPTCP_ADD_ADDR6_BASE; 9932ec72faeSGeliang Tang if (!echo) 9942ec72faeSGeliang Tang len += MPTCPOPT_THMAC_LEN; 99527ab92d9SDavide Caratti /* account for 2 trailing 'nop' options */ 9964a2777a8SGeliang Tang if (port) 99727ab92d9SDavide Caratti len += TCPOLEN_MPTCP_PORT_LEN + TCPOLEN_MPTCP_PORT_ALIGN; 9982ec72faeSGeliang Tang 9992ec72faeSGeliang Tang return len; 10001b1c7a0eSPeter Krystad } 10011b1c7a0eSPeter Krystad 10026445e17aSGeliang Tang static inline int mptcp_rm_addr_len(const struct mptcp_rm_list *rm_list) 10036445e17aSGeliang Tang { 10046445e17aSGeliang Tang if (rm_list->nr == 0 || rm_list->nr > MPTCP_RM_IDS_MAX) 10056445e17aSGeliang Tang return -EINVAL; 10066445e17aSGeliang Tang 10076445e17aSGeliang Tang return TCPOLEN_MPTCP_RM_ADDR_BASE + roundup(rm_list->nr - 1, 4) + 1; 10086445e17aSGeliang Tang } 10096445e17aSGeliang Tang 101090d93088SPaolo Abeni bool mptcp_pm_add_addr_signal(struct mptcp_sock *msk, const struct sk_buff *skb, 10111f5e9e2fSYonglong Li unsigned int opt_size, unsigned int remaining, 1012f462a446SYonglong Li struct mptcp_addr_info *addr, bool *echo, 1013af7939f3SGeliang Tang bool *drop_other_suboptions); 10145cb104aeSGeliang Tang bool mptcp_pm_rm_addr_signal(struct mptcp_sock *msk, unsigned int remaining, 10156445e17aSGeliang Tang struct mptcp_rm_list *rm_list); 10161b1c7a0eSPeter Krystad int mptcp_pm_get_local_id(struct mptcp_sock *msk, struct sock_common *skc); 10179bbec87eSGeliang Tang int mptcp_pm_nl_get_local_id(struct mptcp_sock *msk, struct mptcp_addr_info *skc); 10188b201370SKishen Maloor int mptcp_userspace_pm_get_local_id(struct mptcp_sock *msk, struct mptcp_addr_info *skc); 10191b1c7a0eSPeter Krystad 1020d39dcecaSPaolo Abeni void __init mptcp_pm_nl_init(void); 1021e9801430SFlorian Westphal void mptcp_pm_nl_work(struct mptcp_sock *msk); 1022ddd14bb8SGeliang Tang void mptcp_pm_nl_rm_subflow_received(struct mptcp_sock *msk, 1023ddd14bb8SGeliang Tang const struct mptcp_rm_list *rm_list); 102490d93088SPaolo Abeni unsigned int mptcp_pm_get_add_addr_signal_max(const struct mptcp_sock *msk); 102590d93088SPaolo Abeni unsigned int mptcp_pm_get_add_addr_accept_max(const struct mptcp_sock *msk); 102690d93088SPaolo Abeni unsigned int mptcp_pm_get_subflows_max(const struct mptcp_sock *msk); 102790d93088SPaolo Abeni unsigned int mptcp_pm_get_local_addr_max(const struct mptcp_sock *msk); 102801cacb00SPaolo Abeni 102995d68651SPaolo Abeni /* called under PM lock */ 103095d68651SPaolo Abeni static inline void __mptcp_pm_close_subflow(struct mptcp_sock *msk) 103195d68651SPaolo Abeni { 103295d68651SPaolo Abeni if (--msk->pm.subflows < mptcp_pm_get_subflows_max(msk)) 103395d68651SPaolo Abeni WRITE_ONCE(msk->pm.accept_subflow, true); 103495d68651SPaolo Abeni } 103595d68651SPaolo Abeni 103695d68651SPaolo Abeni static inline void mptcp_pm_close_subflow(struct mptcp_sock *msk) 103795d68651SPaolo Abeni { 103895d68651SPaolo Abeni spin_lock_bh(&msk->pm.lock); 103995d68651SPaolo Abeni __mptcp_pm_close_subflow(msk); 104095d68651SPaolo Abeni spin_unlock_bh(&msk->pm.lock); 104195d68651SPaolo Abeni } 104295d68651SPaolo Abeni 104378962489SFlorian Westphal void mptcp_sockopt_sync(struct mptcp_sock *msk, struct sock *ssk); 10443e501490SPaolo Abeni void mptcp_sockopt_sync_locked(struct mptcp_sock *msk, struct sock *ssk); 104578962489SFlorian Westphal 1046dc87efdbSFlorian Westphal static inline struct mptcp_ext *mptcp_get_ext(const struct sk_buff *skb) 10476d0060f6SMat Martineau { 10486d0060f6SMat Martineau return (struct mptcp_ext *)skb_ext_find(skb, SKB_EXT_MPTCP); 10496d0060f6SMat Martineau } 10506d0060f6SMat Martineau 10515147dfb5SDavide Caratti void mptcp_diag_subflow_init(struct tcp_ulp_ops *ops); 10525147dfb5SDavide Caratti 1053d5f49190SPaolo Abeni static inline bool __mptcp_check_fallback(const struct mptcp_sock *msk) 1054e1ff9e82SDavide Caratti { 1055e1ff9e82SDavide Caratti return test_bit(MPTCP_FALLBACK_DONE, &msk->flags); 1056e1ff9e82SDavide Caratti } 1057e1ff9e82SDavide Caratti 1058d5f49190SPaolo Abeni static inline bool mptcp_check_fallback(const struct sock *sk) 1059e1ff9e82SDavide Caratti { 1060e1ff9e82SDavide Caratti struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); 1061e1ff9e82SDavide Caratti struct mptcp_sock *msk = mptcp_sk(subflow->conn); 1062e1ff9e82SDavide Caratti 1063e1ff9e82SDavide Caratti return __mptcp_check_fallback(msk); 1064e1ff9e82SDavide Caratti } 1065e1ff9e82SDavide Caratti 1066e1ff9e82SDavide Caratti static inline void __mptcp_do_fallback(struct mptcp_sock *msk) 1067e1ff9e82SDavide Caratti { 106883d580ddSGeliang Tang if (__mptcp_check_fallback(msk)) { 1069e1ff9e82SDavide Caratti pr_debug("TCP fallback already done (msk=%p)", msk); 1070e1ff9e82SDavide Caratti return; 1071e1ff9e82SDavide Caratti } 1072e1ff9e82SDavide Caratti set_bit(MPTCP_FALLBACK_DONE, &msk->flags); 1073e1ff9e82SDavide Caratti } 1074e1ff9e82SDavide Caratti 1075*6ebf6f90SGeliang Tang static inline bool __mptcp_has_initial_subflow(const struct mptcp_sock *msk) 1076*6ebf6f90SGeliang Tang { 1077*6ebf6f90SGeliang Tang struct sock *ssk = READ_ONCE(msk->first); 1078*6ebf6f90SGeliang Tang 1079*6ebf6f90SGeliang Tang return ssk && ((1 << inet_sk_state_load(ssk)) & 1080*6ebf6f90SGeliang Tang (TCPF_ESTABLISHED | TCPF_SYN_SENT | 1081*6ebf6f90SGeliang Tang TCPF_SYN_RECV | TCPF_LISTEN)); 1082*6ebf6f90SGeliang Tang } 1083*6ebf6f90SGeliang Tang 1084d51991e2SPaolo Abeni static inline void mptcp_do_fallback(struct sock *ssk) 1085e1ff9e82SDavide Caratti { 1086d51991e2SPaolo Abeni struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); 1087d51991e2SPaolo Abeni struct sock *sk = subflow->conn; 1088d51991e2SPaolo Abeni struct mptcp_sock *msk; 1089e1ff9e82SDavide Caratti 1090d51991e2SPaolo Abeni msk = mptcp_sk(sk); 1091e1ff9e82SDavide Caratti __mptcp_do_fallback(msk); 1092d51991e2SPaolo Abeni if (READ_ONCE(msk->snd_data_fin_enable) && !(ssk->sk_shutdown & SEND_SHUTDOWN)) { 1093d51991e2SPaolo Abeni gfp_t saved_allocation = ssk->sk_allocation; 1094d51991e2SPaolo Abeni 1095d51991e2SPaolo Abeni /* we are in a atomic (BH) scope, override ssk default for data 1096d51991e2SPaolo Abeni * fin allocation 1097d51991e2SPaolo Abeni */ 1098d51991e2SPaolo Abeni ssk->sk_allocation = GFP_ATOMIC; 1099d51991e2SPaolo Abeni ssk->sk_shutdown |= SEND_SHUTDOWN; 1100d51991e2SPaolo Abeni tcp_shutdown(ssk, SEND_SHUTDOWN); 1101d51991e2SPaolo Abeni ssk->sk_allocation = saved_allocation; 1102d51991e2SPaolo Abeni } 1103e1ff9e82SDavide Caratti } 1104e1ff9e82SDavide Caratti 1105e1ff9e82SDavide Caratti #define pr_fallback(a) pr_debug("%s:fallback to TCP (msk=%p)", __func__, a) 1106e1ff9e82SDavide Caratti 11071e39e5a3SGeliang Tang static inline bool mptcp_check_infinite_map(struct sk_buff *skb) 11081e39e5a3SGeliang Tang { 11091e39e5a3SGeliang Tang struct mptcp_ext *mpext; 11101e39e5a3SGeliang Tang 11111e39e5a3SGeliang Tang mpext = skb ? mptcp_get_ext(skb) : NULL; 11121e39e5a3SGeliang Tang if (mpext && mpext->infinite_map) 11131e39e5a3SGeliang Tang return true; 11141e39e5a3SGeliang Tang 11151e39e5a3SGeliang Tang return false; 11161e39e5a3SGeliang Tang } 11171e39e5a3SGeliang Tang 111870c708e8SKishen Maloor static inline bool is_active_ssk(struct mptcp_subflow_context *subflow) 111970c708e8SKishen Maloor { 112070c708e8SKishen Maloor return (subflow->request_mptcp || subflow->request_join); 112170c708e8SKishen Maloor } 112270c708e8SKishen Maloor 11238fd73804SDavide Caratti static inline bool subflow_simultaneous_connect(struct sock *sk) 11248fd73804SDavide Caratti { 11258fd73804SDavide Caratti struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); 11268fd73804SDavide Caratti 11278fd73804SDavide Caratti return sk->sk_state == TCP_ESTABLISHED && 112870c708e8SKishen Maloor is_active_ssk(subflow) && 11298fd73804SDavide Caratti !subflow->conn_finished; 11308fd73804SDavide Caratti } 11318fd73804SDavide Caratti 11329466a1ccSFlorian Westphal #ifdef CONFIG_SYN_COOKIES 11339466a1ccSFlorian Westphal void subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req, 11349466a1ccSFlorian Westphal struct sk_buff *skb); 11359466a1ccSFlorian Westphal bool mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req, 11369466a1ccSFlorian Westphal struct sk_buff *skb); 11379466a1ccSFlorian Westphal void __init mptcp_join_cookie_init(void); 11389466a1ccSFlorian Westphal #else 11399466a1ccSFlorian Westphal static inline void 11409466a1ccSFlorian Westphal subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req, 11419466a1ccSFlorian Westphal struct sk_buff *skb) {} 11429466a1ccSFlorian Westphal static inline bool 11439466a1ccSFlorian Westphal mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req, 11449466a1ccSFlorian Westphal struct sk_buff *skb) 11459466a1ccSFlorian Westphal { 11469466a1ccSFlorian Westphal return false; 11479466a1ccSFlorian Westphal } 11489466a1ccSFlorian Westphal 11499466a1ccSFlorian Westphal static inline void mptcp_join_cookie_init(void) {} 11509466a1ccSFlorian Westphal #endif 11519466a1ccSFlorian Westphal 1152f870fa0bSMat Martineau #endif /* __MPTCP_PROTOCOL_H */ 1153