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 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 int snd_burst; 274ea4ca586SPaolo Abeni int old_wspace; 2751e1d9d6fSPaolo Abeni u64 recovery_snd_nxt; /* in recovery mode accept up to this seq; 2761e1d9d6fSPaolo Abeni * recovery related fields are under data_lock 2771e1d9d6fSPaolo Abeni * protection 2781e1d9d6fSPaolo Abeni */ 27938967f42SPaolo Abeni u64 bytes_acked; 2807439d687SPaolo Abeni u64 snd_una; 2817439d687SPaolo Abeni u64 wnd_end; 282b51f9b80SPaolo Abeni unsigned long timer_ival; 28379c0949eSPeter Krystad u32 token; 28487952603SPaolo Abeni int rmem_released; 285648ef4b8SMat Martineau unsigned long flags; 286e9d09bacSPaolo Abeni unsigned long cb_flags; 287e9d09bacSPaolo Abeni unsigned long push_pending; 2881e1d9d6fSPaolo Abeni bool recovery; /* closing subflow write queue reinjected */ 289d22f4988SChristoph Paasch bool can_ack; 290b93df08cSPaolo Abeni bool fully_established; 2913721b9b6SMat Martineau bool rcv_data_fin; 2927279da61SMat Martineau bool snd_data_fin_enable; 29350c504a2SFlorian Westphal bool rcv_fastclose; 29437198e93SDavide Caratti bool use_64bit_ack; /* Set when we received a 64-bit DSN */ 295752e9067SGeliang Tang bool csum_enabled; 2960530020aSGeliang Tang bool allow_infinite_fallback; 2973ad14f54SPaolo Abeni u8 mpc_endpoint_id; 2984f6e14bdSMaxim Galaganov u8 recvmsg_inq:1, 2994f6e14bdSMaxim Galaganov cork:1, 30054f1944eSPaolo Abeni nodelay:1, 301b6985b9bSPaolo Abeni fastopening:1, 30239880bd8SPaolo Abeni in_accept_queue:1, 30339880bd8SPaolo Abeni free_first: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; 31239880bd8SPaolo Abeni struct sock *first; /* The mptcp ops can safely dereference, using suitable 3135b825727SPaolo Abeni * ONCE annotation, the subflow outside the socket 3145b825727SPaolo Abeni * lock as such sock is freed after close(). 3155b825727SPaolo Abeni */ 3161b1c7a0eSPeter Krystad struct mptcp_pm_data pm; 3171730b2b2SGeliang Tang struct mptcp_sched_ops *sched; 318a6b118feSFlorian Westphal struct { 319a6b118feSFlorian Westphal u32 space; /* bytes copied in last measurement window */ 320a6b118feSFlorian Westphal u32 copied; /* bytes copied in this measurement window */ 321a6b118feSFlorian Westphal u64 time; /* start time of measurement window */ 322a6b118feSFlorian Westphal u64 rtt_us; /* last maximum rtt of subflows */ 323a6b118feSFlorian Westphal } rcvq_space; 324b8dc6d6cSPaolo Abeni u8 scaling_ratio; 325df00b087SFlorian Westphal 3266f06b4d4SPaolo Abeni u32 subflow_id; 327df00b087SFlorian Westphal u32 setsockopt_seq; 32820b5759fSPaolo Abeni char ca_name[TCP_CA_NAME_MAX]; 329f870fa0bSMat Martineau }; 330f870fa0bSMat Martineau 33187952603SPaolo Abeni #define mptcp_data_lock(sk) spin_lock_bh(&(sk)->sk_lock.slock) 33287952603SPaolo Abeni #define mptcp_data_unlock(sk) spin_unlock_bh(&(sk)->sk_lock.slock) 33387952603SPaolo Abeni 334cec37a6eSPeter Krystad #define mptcp_for_each_subflow(__msk, __subflow) \ 335cec37a6eSPeter Krystad list_for_each_entry(__subflow, &((__msk)->conn_list), node) 3365efbf6f7SMatthieu Baerts #define mptcp_for_each_subflow_safe(__msk, __subflow, __tmp) \ 3375efbf6f7SMatthieu Baerts list_for_each_entry_safe(__subflow, __tmp, &((__msk)->conn_list), node) 338cec37a6eSPeter Krystad 3393abc05d9SFlorian Westphal static inline void msk_owned_by_me(const struct mptcp_sock *msk) 3403abc05d9SFlorian Westphal { 3413abc05d9SFlorian Westphal sock_owned_by_me((const struct sock *)msk); 3423abc05d9SFlorian Westphal } 3433abc05d9SFlorian Westphal 344403a40f2SEric Dumazet #define mptcp_sk(ptr) container_of_const(ptr, struct mptcp_sock, sk.icsk_inet.sk) 345f870fa0bSMat Martineau 346ce599c51SPaolo Abeni /* the msk socket don't use the backlog, also account for the bulk 347ce599c51SPaolo Abeni * free memory 348ce599c51SPaolo Abeni */ 349ce599c51SPaolo Abeni static inline int __mptcp_rmem(const struct sock *sk) 350ce599c51SPaolo Abeni { 351ce599c51SPaolo Abeni return atomic_read(&sk->sk_rmem_alloc) - READ_ONCE(mptcp_sk(sk)->rmem_released); 352ce599c51SPaolo Abeni } 353ce599c51SPaolo Abeni 354b8dc6d6cSPaolo Abeni static inline int mptcp_win_from_space(const struct sock *sk, int space) 355b8dc6d6cSPaolo Abeni { 356b8dc6d6cSPaolo Abeni return __tcp_win_from_space(mptcp_sk(sk)->scaling_ratio, space); 357b8dc6d6cSPaolo Abeni } 358b8dc6d6cSPaolo Abeni 359ea4ca586SPaolo Abeni static inline int __mptcp_space(const struct sock *sk) 360ea4ca586SPaolo Abeni { 361b8dc6d6cSPaolo Abeni return mptcp_win_from_space(sk, READ_ONCE(sk->sk_rcvbuf) - __mptcp_rmem(sk)); 362ea4ca586SPaolo Abeni } 363ea4ca586SPaolo Abeni 364f0e6a4cfSPaolo Abeni static inline struct mptcp_data_frag *mptcp_send_head(const struct sock *sk) 365f0e6a4cfSPaolo Abeni { 366f0e6a4cfSPaolo Abeni const struct mptcp_sock *msk = mptcp_sk(sk); 367f0e6a4cfSPaolo Abeni 368f0e6a4cfSPaolo Abeni return READ_ONCE(msk->first_pending); 369f0e6a4cfSPaolo Abeni } 370f0e6a4cfSPaolo Abeni 371f0e6a4cfSPaolo Abeni static inline struct mptcp_data_frag *mptcp_send_next(struct sock *sk) 372f0e6a4cfSPaolo Abeni { 373f0e6a4cfSPaolo Abeni struct mptcp_sock *msk = mptcp_sk(sk); 374f0e6a4cfSPaolo Abeni struct mptcp_data_frag *cur; 375f0e6a4cfSPaolo Abeni 376f0e6a4cfSPaolo Abeni cur = msk->first_pending; 377f0e6a4cfSPaolo Abeni return list_is_last(&cur->list, &msk->rtx_queue) ? NULL : 378f0e6a4cfSPaolo Abeni list_next_entry(cur, list); 379f0e6a4cfSPaolo Abeni } 380f0e6a4cfSPaolo Abeni 381f0e6a4cfSPaolo Abeni static inline struct mptcp_data_frag *mptcp_pending_tail(const struct sock *sk) 382f0e6a4cfSPaolo Abeni { 383403a40f2SEric Dumazet const struct mptcp_sock *msk = mptcp_sk(sk); 384f0e6a4cfSPaolo Abeni 385f0e6a4cfSPaolo Abeni if (!msk->first_pending) 386f0e6a4cfSPaolo Abeni return NULL; 387f0e6a4cfSPaolo Abeni 388f0e6a4cfSPaolo Abeni if (WARN_ON_ONCE(list_empty(&msk->rtx_queue))) 389f0e6a4cfSPaolo Abeni return NULL; 390f0e6a4cfSPaolo Abeni 391f0e6a4cfSPaolo Abeni return list_last_entry(&msk->rtx_queue, struct mptcp_data_frag, list); 392f0e6a4cfSPaolo Abeni } 393f0e6a4cfSPaolo Abeni 394403a40f2SEric Dumazet static inline struct mptcp_data_frag *mptcp_rtx_head(struct sock *sk) 3957948f6ccSFlorian Westphal { 3967948f6ccSFlorian Westphal struct mptcp_sock *msk = mptcp_sk(sk); 3977948f6ccSFlorian Westphal 39864b9cea7SPaolo Abeni if (msk->snd_una == READ_ONCE(msk->snd_nxt)) 39964b9cea7SPaolo Abeni return NULL; 40064b9cea7SPaolo Abeni 401a386bc5bSGeliang Tang return list_first_entry_or_null(&msk->rtx_queue, struct mptcp_data_frag, list); 4027948f6ccSFlorian Westphal } 4037948f6ccSFlorian Westphal 404d0cc2987SGeliang Tang struct csum_pseudo_header { 405d0cc2987SGeliang Tang __be64 data_seq; 406d0cc2987SGeliang Tang __be32 subflow_seq; 407d0cc2987SGeliang Tang __be16 data_len; 408d0cc2987SGeliang Tang __sum16 csum; 409d0cc2987SGeliang Tang }; 410d0cc2987SGeliang Tang 411cec37a6eSPeter Krystad struct mptcp_subflow_request_sock { 412cec37a6eSPeter Krystad struct tcp_request_sock sk; 413d22f4988SChristoph Paasch u16 mp_capable : 1, 414cec37a6eSPeter Krystad mp_join : 1, 41506fe1719SGeliang Tang backup : 1, 416bab6b88eSGeliang Tang csum_reqd : 1, 417bab6b88eSGeliang Tang allow_join_id0 : 1; 4181b1c7a0eSPeter Krystad u8 local_id; 419f296234cSPeter Krystad u8 remote_id; 420cec37a6eSPeter Krystad u64 local_key; 42179c0949eSPeter Krystad u64 idsn; 42279c0949eSPeter Krystad u32 token; 423648ef4b8SMat Martineau u32 ssn_offset; 424f296234cSPeter Krystad u64 thmac; 425f296234cSPeter Krystad u32 local_nonce; 426f296234cSPeter Krystad u32 remote_nonce; 4278fd4de12SPaolo Abeni struct mptcp_sock *msk; 4282c5ebd00SPaolo Abeni struct hlist_nulls_node token_node; 429cec37a6eSPeter Krystad }; 430cec37a6eSPeter Krystad 431cec37a6eSPeter Krystad static inline struct mptcp_subflow_request_sock * 432cec37a6eSPeter Krystad mptcp_subflow_rsk(const struct request_sock *rsk) 433cec37a6eSPeter Krystad { 434cec37a6eSPeter Krystad return (struct mptcp_subflow_request_sock *)rsk; 435cec37a6eSPeter Krystad } 436cec37a6eSPeter Krystad 437b19bc294SPaolo Abeni struct mptcp_delegated_action { 438b19bc294SPaolo Abeni struct napi_struct napi; 439b19bc294SPaolo Abeni struct list_head head; 440b19bc294SPaolo Abeni }; 441b19bc294SPaolo Abeni 442b19bc294SPaolo Abeni DECLARE_PER_CPU(struct mptcp_delegated_action, mptcp_delegated_actions); 443b19bc294SPaolo Abeni 444a5efdbceSPaolo Abeni #define MPTCP_DELEGATE_SCHEDULED 0 445a5efdbceSPaolo Abeni #define MPTCP_DELEGATE_SEND 1 446a5efdbceSPaolo Abeni #define MPTCP_DELEGATE_ACK 2 447b19bc294SPaolo Abeni 448a5efdbceSPaolo Abeni #define MPTCP_DELEGATE_ACTIONS_MASK (~BIT(MPTCP_DELEGATE_SCHEDULED)) 4492303f994SPeter Krystad /* MPTCP subflow context */ 4502303f994SPeter Krystad struct mptcp_subflow_context { 451cec37a6eSPeter Krystad struct list_head node;/* conn_list of subflows */ 452b29fcfb5SPaolo Abeni 45363ec72bdSKees Cook struct_group(reset, 454b29fcfb5SPaolo Abeni 4553ce0852cSPaolo Abeni unsigned long avg_pacing_rate; /* protected by msk socket lock */ 456cec37a6eSPeter Krystad u64 local_key; 457cec37a6eSPeter Krystad u64 remote_key; 45879c0949eSPeter Krystad u64 idsn; 459648ef4b8SMat Martineau u64 map_seq; 460cc7972eaSChristoph Paasch u32 snd_isn; 46179c0949eSPeter Krystad u32 token; 4626d0060f6SMat Martineau u32 rel_write_seq; 463648ef4b8SMat Martineau u32 map_subflow_seq; 464648ef4b8SMat Martineau u32 ssn_offset; 465648ef4b8SMat Martineau u32 map_data_len; 466dd8bcd17SPaolo Abeni __wsum map_data_csum; 467dd8bcd17SPaolo Abeni u32 map_csum_len; 468cec37a6eSPeter Krystad u32 request_mptcp : 1, /* send MP_CAPABLE */ 469ec3edaa7SPeter Krystad request_join : 1, /* send MP_JOIN */ 470ec3edaa7SPeter Krystad request_bkup : 1, 471cec37a6eSPeter Krystad mp_capable : 1, /* remote is MPTCP capable */ 472f296234cSPeter Krystad mp_join : 1, /* remote is JOINing */ 4730be534f5SPaolo Abeni fully_established : 1, /* path validated */ 474f296234cSPeter Krystad pm_notified : 1, /* PM hook called for established status */ 475648ef4b8SMat Martineau conn_finished : 1, 476648ef4b8SMat Martineau map_valid : 1, 477dd8bcd17SPaolo Abeni map_csum_reqd : 1, 478dd8bcd17SPaolo Abeni map_data_fin : 1, 479d22f4988SChristoph Paasch mpc_map : 1, 480f296234cSPeter Krystad backup : 1, 48106706542SGeliang Tang send_mp_prio : 1, 482c25aeb4eSGeliang Tang send_mp_fail : 1, 483f284c0c7SPaolo Abeni send_fastclose : 1, 4841e39e5a3SGeliang Tang send_infinite_map : 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 */ 491b7535cfeSPaolo Abeni __unused : 9; 492*f1f26512SPaolo Abeni bool data_avail; 493fce68b03SGeliang Tang bool scheduled; 494f296234cSPeter Krystad u32 remote_nonce; 495f296234cSPeter Krystad u64 thmac; 496f296234cSPeter Krystad u32 local_nonce; 497ec3edaa7SPeter Krystad u32 remote_token; 498b3ea6b27SPaolo Abeni union { 499b3ea6b27SPaolo Abeni u8 hmac[MPTCPOPT_HMAC_LEN]; /* MPJ subflow only */ 500b3ea6b27SPaolo Abeni u64 iasn; /* initial ack sequence number, MPC subflows only */ 501b3ea6b27SPaolo Abeni }; 502f296234cSPeter Krystad u8 local_id; 503f296234cSPeter Krystad u8 remote_id; 504dc87efdbSFlorian Westphal u8 reset_seen:1; 505dc87efdbSFlorian Westphal u8 reset_transient:1; 506dc87efdbSFlorian Westphal u8 reset_reason:4; 50771b7dec2SPaolo Abeni u8 stale_count; 508648ef4b8SMat Martineau 5096f06b4d4SPaolo Abeni u32 subflow_id; 5106f06b4d4SPaolo Abeni 511b19bc294SPaolo Abeni long delegated_status; 51276a13b31SGeliang Tang unsigned long fail_tout; 513b29fcfb5SPaolo Abeni 51463ec72bdSKees Cook ); 515b29fcfb5SPaolo Abeni 516b19bc294SPaolo Abeni struct list_head delegated_node; /* link into delegated_action, protected by local BH */ 517b19bc294SPaolo Abeni 518df00b087SFlorian Westphal u32 setsockopt_seq; 51971b7dec2SPaolo Abeni u32 stale_rcv_tstamp; 520df00b087SFlorian Westphal 5212303f994SPeter Krystad struct sock *tcp_sock; /* tcp sk backpointer */ 5222303f994SPeter Krystad struct sock *conn; /* parent mptcp_sock */ 523cec37a6eSPeter Krystad const struct inet_connection_sock_af_ops *icsk_af_ops; 524648ef4b8SMat Martineau void (*tcp_state_change)(struct sock *sk); 52515cc1045SPaolo Abeni void (*tcp_error_report)(struct sock *sk); 526648ef4b8SMat Martineau 5272303f994SPeter Krystad struct rcu_head rcu; 5282303f994SPeter Krystad }; 5292303f994SPeter Krystad 5302303f994SPeter Krystad static inline struct mptcp_subflow_context * 5312303f994SPeter Krystad mptcp_subflow_ctx(const struct sock *sk) 5322303f994SPeter Krystad { 5332303f994SPeter Krystad struct inet_connection_sock *icsk = inet_csk(sk); 5342303f994SPeter Krystad 5352303f994SPeter Krystad /* Use RCU on icsk_ulp_data only for sock diag code */ 5362303f994SPeter Krystad return (__force struct mptcp_subflow_context *)icsk->icsk_ulp_data; 5372303f994SPeter Krystad } 5382303f994SPeter Krystad 5392303f994SPeter Krystad static inline struct sock * 5402303f994SPeter Krystad mptcp_subflow_tcp_sock(const struct mptcp_subflow_context *subflow) 5412303f994SPeter Krystad { 5422303f994SPeter Krystad return subflow->tcp_sock; 5432303f994SPeter Krystad } 5442303f994SPeter Krystad 545b29fcfb5SPaolo Abeni static inline void 546b29fcfb5SPaolo Abeni mptcp_subflow_ctx_reset(struct mptcp_subflow_context *subflow) 547b29fcfb5SPaolo Abeni { 54863ec72bdSKees Cook memset(&subflow->reset, 0, sizeof(subflow->reset)); 549b29fcfb5SPaolo Abeni subflow->request_mptcp = 1; 550b29fcfb5SPaolo Abeni } 551b29fcfb5SPaolo Abeni 552648ef4b8SMat Martineau static inline u64 553648ef4b8SMat Martineau mptcp_subflow_get_map_offset(const struct mptcp_subflow_context *subflow) 554648ef4b8SMat Martineau { 555648ef4b8SMat Martineau return tcp_sk(mptcp_subflow_tcp_sock(subflow))->copied_seq - 556648ef4b8SMat Martineau subflow->ssn_offset - 557648ef4b8SMat Martineau subflow->map_subflow_seq; 558648ef4b8SMat Martineau } 559648ef4b8SMat Martineau 560648ef4b8SMat Martineau static inline u64 561648ef4b8SMat Martineau mptcp_subflow_get_mapped_dsn(const struct mptcp_subflow_context *subflow) 562648ef4b8SMat Martineau { 563648ef4b8SMat Martineau return subflow->map_seq + mptcp_subflow_get_map_offset(subflow); 564648ef4b8SMat Martineau } 565648ef4b8SMat Martineau 566a5efdbceSPaolo Abeni void mptcp_subflow_process_delegated(struct sock *ssk, long actions); 567b19bc294SPaolo Abeni 568bcd97734SPaolo Abeni static inline void mptcp_subflow_delegate(struct mptcp_subflow_context *subflow, int action) 569b19bc294SPaolo Abeni { 570a5efdbceSPaolo Abeni long old, set_bits = BIT(MPTCP_DELEGATE_SCHEDULED) | BIT(action); 571b19bc294SPaolo Abeni struct mptcp_delegated_action *delegated; 572b19bc294SPaolo Abeni bool schedule; 573b19bc294SPaolo Abeni 574bcd97734SPaolo Abeni /* the caller held the subflow bh socket lock */ 575bcd97734SPaolo Abeni lockdep_assert_in_softirq(); 576bcd97734SPaolo Abeni 577a5efdbceSPaolo Abeni /* The implied barrier pairs with tcp_release_cb_override() 578a5efdbceSPaolo Abeni * mptcp_napi_poll(), and ensures the below list check sees list 579a5efdbceSPaolo Abeni * updates done prior to delegated status bits changes 580b19bc294SPaolo Abeni */ 581a5efdbceSPaolo Abeni old = set_mask_bits(&subflow->delegated_status, 0, set_bits); 582a5efdbceSPaolo Abeni if (!(old & BIT(MPTCP_DELEGATE_SCHEDULED))) { 583a5efdbceSPaolo Abeni if (WARN_ON_ONCE(!list_empty(&subflow->delegated_node))) 584b19bc294SPaolo Abeni return; 585b19bc294SPaolo Abeni 586b19bc294SPaolo Abeni delegated = this_cpu_ptr(&mptcp_delegated_actions); 587b19bc294SPaolo Abeni schedule = list_empty(&delegated->head); 588b19bc294SPaolo Abeni list_add_tail(&subflow->delegated_node, &delegated->head); 589b19bc294SPaolo Abeni sock_hold(mptcp_subflow_tcp_sock(subflow)); 590b19bc294SPaolo Abeni if (schedule) 591b19bc294SPaolo Abeni napi_schedule(&delegated->napi); 592b19bc294SPaolo Abeni } 593b19bc294SPaolo Abeni } 594b19bc294SPaolo Abeni 595b19bc294SPaolo Abeni static inline struct mptcp_subflow_context * 596b19bc294SPaolo Abeni mptcp_subflow_delegated_next(struct mptcp_delegated_action *delegated) 597b19bc294SPaolo Abeni { 598b19bc294SPaolo Abeni struct mptcp_subflow_context *ret; 599b19bc294SPaolo Abeni 600b19bc294SPaolo Abeni if (list_empty(&delegated->head)) 601b19bc294SPaolo Abeni return NULL; 602b19bc294SPaolo Abeni 603b19bc294SPaolo Abeni ret = list_first_entry(&delegated->head, struct mptcp_subflow_context, delegated_node); 604b19bc294SPaolo Abeni list_del_init(&ret->delegated_node); 605b19bc294SPaolo Abeni return ret; 606b19bc294SPaolo Abeni } 607b19bc294SPaolo Abeni 6086da14d74SPaolo Abeni int mptcp_is_enabled(const struct net *net); 6096da14d74SPaolo Abeni unsigned int mptcp_get_add_addr_timeout(const struct net *net); 6106da14d74SPaolo Abeni int mptcp_is_checksum_enabled(const struct net *net); 6116da14d74SPaolo Abeni int mptcp_allow_join_id0(const struct net *net); 612ff5a0b42SPaolo Abeni unsigned int mptcp_stale_loss_cnt(const struct net *net); 613d866ae9aSPaolo Abeni unsigned int mptcp_close_timeout(const struct sock *sk); 6146bb63cccSMat Martineau int mptcp_get_pm_type(const struct net *net); 615e3b2870bSGeliang Tang const char *mptcp_get_scheduler(const struct net *net); 616b93df08cSPaolo Abeni void mptcp_subflow_fully_established(struct mptcp_subflow_context *subflow, 617b3ea6b27SPaolo Abeni const struct mptcp_options_received *mp_opt); 6181e1d9d6fSPaolo Abeni bool __mptcp_retransmit_pending_data(struct sock *sk); 6198b38217aSMaxim Galaganov void mptcp_check_and_set_pending(struct sock *sk); 620ff5a0b42SPaolo Abeni void __mptcp_push_pending(struct sock *sk, unsigned int flags); 621648ef4b8SMat Martineau bool mptcp_subflow_data_available(struct sock *sk); 622d39dcecaSPaolo Abeni void __init mptcp_subflow_init(void); 623d0876b22SGeliang Tang void mptcp_subflow_shutdown(struct sock *sk, struct sock *ssk, int how); 624a141e02eSFlorian Westphal void mptcp_close_ssk(struct sock *sk, struct sock *ssk, 625e16163b6SPaolo Abeni struct mptcp_subflow_context *subflow); 626a6574302SMat Martineau void __mptcp_subflow_send_ack(struct sock *ssk); 627d5824847SPaolo Abeni void mptcp_subflow_reset(struct sock *ssk); 6282a6a870eSPaolo Abeni void mptcp_subflow_queue_clean(struct sock *sk, struct sock *ssk); 629866f26f2SPaolo Abeni void mptcp_sock_graft(struct sock *sk, struct socket *parent); 6303f326a82SPaolo Abeni struct sock *__mptcp_nmpc_sk(struct mptcp_sock *msk); 63126d3e21cSMenglong Dong bool __mptcp_close(struct sock *sk, long timeout); 63230e51b92SMenglong Dong void mptcp_cancel_work(struct sock *sk); 63363740448SPaolo Abeni void __mptcp_unaccepted_force_close(struct sock *sk); 63436b122baSDmytro Shytyi void mptcp_set_owner_r(struct sk_buff *skb, struct sock *sk); 635ec3edaa7SPeter Krystad 6364638de5aSKishen Maloor bool mptcp_addresses_equal(const struct mptcp_addr_info *a, 6374638de5aSKishen Maloor const struct mptcp_addr_info *b, bool use_port); 638dc886bceSGeliang Tang void mptcp_local_address(const struct sock_common *skc, struct mptcp_addr_info *addr); 6394638de5aSKishen Maloor 640ec3edaa7SPeter Krystad /* called with sk socket lock held */ 641ef0da3b8SPaolo Abeni int __mptcp_subflow_connect(struct sock *sk, const struct mptcp_addr_info *loc, 642ee285257SGeliang Tang const struct mptcp_addr_info *remote); 6436bc1fe7dSPaolo Abeni int mptcp_subflow_create_socket(struct sock *sk, unsigned short family, 6446bc1fe7dSPaolo Abeni struct socket **new_sock); 6451729cf18SGeliang Tang void mptcp_info2sockaddr(const struct mptcp_addr_info *info, 6461729cf18SGeliang Tang struct sockaddr_storage *addr, 6471729cf18SGeliang Tang unsigned short family); 648740ebe35SGeliang Tang struct mptcp_sched_ops *mptcp_sched_find(const char *name); 649740ebe35SGeliang Tang int mptcp_register_scheduler(struct mptcp_sched_ops *sched); 650740ebe35SGeliang Tang void mptcp_unregister_scheduler(struct mptcp_sched_ops *sched); 651ed1ad86bSGeliang Tang void mptcp_sched_init(void); 6521730b2b2SGeliang Tang int mptcp_init_sched(struct mptcp_sock *msk, 6531730b2b2SGeliang Tang struct mptcp_sched_ops *sched); 6541730b2b2SGeliang Tang void mptcp_release_sched(struct mptcp_sock *msk); 655fce68b03SGeliang Tang void mptcp_subflow_set_scheduled(struct mptcp_subflow_context *subflow, 656fce68b03SGeliang Tang bool scheduled); 65707336a87SGeliang Tang struct sock *mptcp_subflow_get_send(struct mptcp_sock *msk); 65807336a87SGeliang Tang struct sock *mptcp_subflow_get_retrans(struct mptcp_sock *msk); 65907336a87SGeliang Tang int mptcp_sched_get_send(struct mptcp_sock *msk); 66007336a87SGeliang Tang int mptcp_sched_get_retrans(struct mptcp_sock *msk); 6612303f994SPeter Krystad 662c886d702SPaolo Abeni static inline bool __tcp_can_send(const struct sock *ssk) 663c886d702SPaolo Abeni { 664c886d702SPaolo Abeni /* only send if our side has not closed yet */ 665c886d702SPaolo Abeni return ((1 << inet_sk_state_load(ssk)) & (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT)); 666c886d702SPaolo Abeni } 667c886d702SPaolo Abeni 668ff5a0b42SPaolo Abeni static inline bool __mptcp_subflow_active(struct mptcp_subflow_context *subflow) 66943f1140bSGeliang Tang { 67043f1140bSGeliang Tang /* can't send if JOIN hasn't completed yet (i.e. is usable for mptcp) */ 67143f1140bSGeliang Tang if (subflow->request_join && !subflow->fully_established) 67243f1140bSGeliang Tang return false; 67343f1140bSGeliang Tang 674c886d702SPaolo Abeni return __tcp_can_send(mptcp_subflow_tcp_sock(subflow)); 67543f1140bSGeliang Tang } 67643f1140bSGeliang Tang 677ff5a0b42SPaolo Abeni void mptcp_subflow_set_active(struct mptcp_subflow_context *subflow); 678ff5a0b42SPaolo Abeni 679ff5a0b42SPaolo Abeni bool mptcp_subflow_active(struct mptcp_subflow_context *subflow); 680ff5a0b42SPaolo Abeni 681b6985b9bSPaolo Abeni void mptcp_subflow_drop_ctx(struct sock *ssk); 682b6985b9bSPaolo Abeni 683648ef4b8SMat Martineau static inline void mptcp_subflow_tcp_fallback(struct sock *sk, 684648ef4b8SMat Martineau struct mptcp_subflow_context *ctx) 685648ef4b8SMat Martineau { 686952382c6SFlorian Westphal sk->sk_data_ready = sock_def_readable; 687648ef4b8SMat Martineau sk->sk_state_change = ctx->tcp_state_change; 688952382c6SFlorian Westphal sk->sk_write_space = sk_stream_write_space; 68915cc1045SPaolo Abeni sk->sk_error_report = ctx->tcp_error_report; 690648ef4b8SMat Martineau 691648ef4b8SMat Martineau inet_csk(sk)->icsk_af_ops = ctx->icsk_af_ops; 692648ef4b8SMat Martineau } 693648ef4b8SMat Martineau 694d39dcecaSPaolo Abeni void __init mptcp_proto_init(void); 695784325e9SMatthieu Baerts #if IS_ENABLED(CONFIG_MPTCP_IPV6) 696d39dcecaSPaolo Abeni int __init mptcp_proto_v6_init(void); 697784325e9SMatthieu Baerts #endif 698648ef4b8SMat Martineau 6997e8b88ecSPaolo Abeni struct sock *mptcp_sk_clone_init(const struct sock *sk, 700cfde141eSPaolo Abeni const struct mptcp_options_received *mp_opt, 7017e8b88ecSPaolo Abeni struct sock *ssk, 702fca5c82cSPaolo Abeni struct request_sock *req); 7030799e21bSGeliang Tang void mptcp_get_options(const struct sk_buff *skb, 704cfde141eSPaolo Abeni struct mptcp_options_received *mp_opt); 705cec37a6eSPeter Krystad 706cec37a6eSPeter Krystad void mptcp_finish_connect(struct sock *sk); 707490274b4SPaolo Abeni void __mptcp_set_connected(struct sock *sk); 708f6909dc1SPaolo Abeni void mptcp_reset_tout_timer(struct mptcp_sock *msk, unsigned long fail_tout); 70927e5ccc2SPaolo Abeni 71027e5ccc2SPaolo Abeni static inline void mptcp_stop_tout_timer(struct sock *sk) 71127e5ccc2SPaolo Abeni { 71227e5ccc2SPaolo Abeni if (!inet_csk(sk)->icsk_mtup.probe_timestamp) 71327e5ccc2SPaolo Abeni return; 71427e5ccc2SPaolo Abeni 71527e5ccc2SPaolo Abeni sk_stop_timer(sk, &sk->sk_timer); 71627e5ccc2SPaolo Abeni inet_csk(sk)->icsk_mtup.probe_timestamp = 0; 71727e5ccc2SPaolo Abeni } 71827e5ccc2SPaolo Abeni 71927e5ccc2SPaolo Abeni static inline void mptcp_set_close_tout(struct sock *sk, unsigned long tout) 72027e5ccc2SPaolo Abeni { 72127e5ccc2SPaolo Abeni /* avoid 0 timestamp, as that means no close timeout */ 72227e5ccc2SPaolo Abeni inet_csk(sk)->icsk_mtup.probe_timestamp = tout ? : 1; 72327e5ccc2SPaolo Abeni } 72427e5ccc2SPaolo Abeni 72527e5ccc2SPaolo Abeni static inline void mptcp_start_tout_timer(struct sock *sk) 72627e5ccc2SPaolo Abeni { 72727e5ccc2SPaolo Abeni mptcp_set_close_tout(sk, tcp_jiffies32); 72827e5ccc2SPaolo Abeni mptcp_reset_tout_timer(mptcp_sk(sk), 0); 72927e5ccc2SPaolo Abeni } 73027e5ccc2SPaolo Abeni 731b93df08cSPaolo Abeni static inline bool mptcp_is_fully_established(struct sock *sk) 732b93df08cSPaolo Abeni { 733b93df08cSPaolo Abeni return inet_sk_state_load(sk) == TCP_ESTABLISHED && 734b93df08cSPaolo Abeni READ_ONCE(mptcp_sk(sk)->fully_established); 735b93df08cSPaolo Abeni } 736a6b118feSFlorian Westphal void mptcp_rcv_space_init(struct mptcp_sock *msk, const struct sock *ssk); 7372e52213cSFlorian Westphal void mptcp_data_ready(struct sock *sk, struct sock *ssk); 738f296234cSPeter Krystad bool mptcp_finish_join(struct sock *sk); 739ba8f48f7SPaolo Abeni bool mptcp_schedule_work(struct sock *sk); 7400abdde82SPaolo Abeni int mptcp_setsockopt(struct sock *sk, int level, int optname, 7410abdde82SPaolo Abeni sockptr_t optval, unsigned int optlen); 7420abdde82SPaolo Abeni int mptcp_getsockopt(struct sock *sk, int level, int optname, 7430abdde82SPaolo Abeni char __user *optval, int __user *option); 7440abdde82SPaolo Abeni 7451502328fSPaolo Abeni u64 __mptcp_expand_seq(u64 old_seq, u64 cur_seq); 7461502328fSPaolo Abeni static inline u64 mptcp_expand_seq(u64 old_seq, u64 cur_seq, bool use_64bit) 7471502328fSPaolo Abeni { 7481502328fSPaolo Abeni if (use_64bit) 7491502328fSPaolo Abeni return cur_seq; 7501502328fSPaolo Abeni 7511502328fSPaolo Abeni return __mptcp_expand_seq(old_seq, cur_seq); 7521502328fSPaolo Abeni } 753219d0499SPaolo Abeni void __mptcp_check_push(struct sock *sk, struct sock *ssk); 7547439d687SPaolo Abeni void __mptcp_data_acked(struct sock *sk); 75515cc1045SPaolo Abeni void __mptcp_error_report(struct sock *sk); 7561a49b2c2SMat Martineau bool mptcp_update_rcv_data_fin(struct mptcp_sock *msk, u64 data_fin_seq, bool use_64bit); 757e16163b6SPaolo Abeni static inline bool mptcp_data_fin_enabled(const struct mptcp_sock *msk) 758e16163b6SPaolo Abeni { 759e16163b6SPaolo Abeni return READ_ONCE(msk->snd_data_fin_enable) && 760e16163b6SPaolo Abeni READ_ONCE(msk->write_seq) == READ_ONCE(msk->snd_nxt); 761e16163b6SPaolo Abeni } 762e16163b6SPaolo Abeni 7635cf92bbaSPaolo Abeni static inline bool mptcp_propagate_sndbuf(struct sock *sk, struct sock *ssk) 7645cf92bbaSPaolo Abeni { 7655cf92bbaSPaolo Abeni if ((sk->sk_userlocks & SOCK_SNDBUF_LOCK) || ssk->sk_sndbuf <= READ_ONCE(sk->sk_sndbuf)) 7665cf92bbaSPaolo Abeni return false; 7675cf92bbaSPaolo Abeni 7685cf92bbaSPaolo Abeni WRITE_ONCE(sk->sk_sndbuf, ssk->sk_sndbuf); 7695cf92bbaSPaolo Abeni return true; 7705cf92bbaSPaolo Abeni } 7715cf92bbaSPaolo Abeni 7725cf92bbaSPaolo Abeni static inline void mptcp_write_space(struct sock *sk) 7735cf92bbaSPaolo Abeni { 7745cf92bbaSPaolo Abeni if (sk_stream_is_writeable(sk)) { 7755cf92bbaSPaolo Abeni /* pairs with memory barrier in mptcp_poll */ 7765cf92bbaSPaolo Abeni smp_mb(); 7775cf92bbaSPaolo Abeni if (test_and_clear_bit(MPTCP_NOSPACE, &mptcp_sk(sk)->flags)) 7785cf92bbaSPaolo Abeni sk_stream_write_space(sk); 7795cf92bbaSPaolo Abeni } 7805cf92bbaSPaolo Abeni } 7815cf92bbaSPaolo Abeni 782c0bf3c6aSPaolo Abeni void mptcp_destroy_common(struct mptcp_sock *msk, unsigned int flags); 783cec37a6eSPeter Krystad 784c68a0cd1SJianguo Wu #define MPTCP_TOKEN_MAX_RETRIES 4 785c68a0cd1SJianguo Wu 7862c5ebd00SPaolo Abeni void __init mptcp_token_init(void); 7872c5ebd00SPaolo Abeni static inline void mptcp_token_init_request(struct request_sock *req) 7882c5ebd00SPaolo Abeni { 7892c5ebd00SPaolo Abeni mptcp_subflow_rsk(req)->token_node.pprev = NULL; 7902c5ebd00SPaolo Abeni } 7912c5ebd00SPaolo Abeni 79279c0949eSPeter Krystad int mptcp_token_new_request(struct request_sock *req); 7932c5ebd00SPaolo Abeni void mptcp_token_destroy_request(struct request_sock *req); 794294de909SMenglong Dong int mptcp_token_new_connect(struct sock *ssk); 7952c5ebd00SPaolo Abeni void mptcp_token_accept(struct mptcp_subflow_request_sock *r, 7962c5ebd00SPaolo Abeni struct mptcp_sock *msk); 797c83a47e5SFlorian Westphal bool mptcp_token_exists(u32 token); 798ea1300b9SFlorian Westphal struct mptcp_sock *mptcp_token_get_sock(struct net *net, u32 token); 79996d890daSPaolo Abeni struct mptcp_sock *mptcp_token_iter_next(const struct net *net, long *s_slot, 80096d890daSPaolo Abeni long *s_num); 8012c5ebd00SPaolo Abeni void mptcp_token_destroy(struct mptcp_sock *msk); 80279c0949eSPeter Krystad 80379c0949eSPeter Krystad void mptcp_crypto_key_sha(u64 key, u32 *token, u64 *idsn); 80479c0949eSPeter Krystad 8053df523abSPeter Krystad void mptcp_crypto_hmac_sha(u64 key1, u64 key2, u8 *msg, int len, void *hmac); 806ba2c89e0SPaolo Abeni __sum16 __mptcp_make_csum(u64 data_seq, u32 subflow_seq, u16 data_len, __wsum sum); 80779c0949eSPeter Krystad 808d39dcecaSPaolo Abeni void __init mptcp_pm_init(void); 8091b1c7a0eSPeter Krystad void mptcp_pm_data_init(struct mptcp_sock *msk); 810b29fcfb5SPaolo Abeni void mptcp_pm_data_reset(struct mptcp_sock *msk); 811702c2f64SFlorian Westphal int mptcp_pm_parse_addr(struct nlattr *attr, struct genl_info *info, 812702c2f64SFlorian Westphal struct mptcp_addr_info *addr); 8139ab4807cSKishen Maloor int mptcp_pm_parse_entry(struct nlattr *attr, struct genl_info *info, 8149ab4807cSKishen Maloor bool require_family, 8159ab4807cSKishen Maloor struct mptcp_pm_addr_entry *entry); 816fb00ee4fSMatthieu Baerts bool mptcp_pm_addr_families_match(const struct sock *sk, 817fb00ee4fSMatthieu Baerts const struct mptcp_addr_info *loc, 818fb00ee4fSMatthieu Baerts const struct mptcp_addr_info *rem); 81971b7dec2SPaolo Abeni void mptcp_pm_subflow_chk_stale(const struct mptcp_sock *msk, struct sock *ssk); 820ff5a0b42SPaolo Abeni void mptcp_pm_nl_subflow_chk_stale(const struct mptcp_sock *msk, struct sock *ssk); 8216c714f1bSFlorian Westphal void mptcp_pm_new_connection(struct mptcp_sock *msk, const struct sock *ssk, int server_side); 8227a486c44SPaolo Abeni void mptcp_pm_fully_established(struct mptcp_sock *msk, const struct sock *ssk); 8231b1c7a0eSPeter Krystad bool mptcp_pm_allow_new_subflow(struct mptcp_sock *msk); 8241b1c7a0eSPeter Krystad void mptcp_pm_connection_closed(struct mptcp_sock *msk); 82562535200SGeliang Tang void mptcp_pm_subflow_established(struct mptcp_sock *msk); 826a88c9e49SPaolo Abeni bool mptcp_pm_nl_check_work_pending(struct mptcp_sock *msk); 827a88c9e49SPaolo Abeni void mptcp_pm_subflow_check_next(struct mptcp_sock *msk, const struct sock *ssk, 828a88c9e49SPaolo Abeni const struct mptcp_subflow_context *subflow); 829d1ace2d9SKishen Maloor void mptcp_pm_add_addr_received(const struct sock *ssk, 8301b1c7a0eSPeter Krystad const struct mptcp_addr_info *addr); 831557963c3SGeliang Tang void mptcp_pm_add_addr_echoed(struct mptcp_sock *msk, 83290d93088SPaolo Abeni const struct mptcp_addr_info *addr); 83384dfe367SGeliang Tang void mptcp_pm_add_addr_send_ack(struct mptcp_sock *msk); 834b46a0238SGeliang Tang void mptcp_pm_nl_addr_send_ack(struct mptcp_sock *msk); 8355c4a824dSGeliang Tang void mptcp_pm_rm_addr_received(struct mptcp_sock *msk, 8365c4a824dSGeliang Tang const struct mptcp_rm_list *rm_list); 83740453a5cSGeliang Tang void mptcp_pm_mp_prio_received(struct sock *sk, u8 bkup); 8385580d41bSGeliang Tang void mptcp_pm_mp_fail_received(struct sock *sk, u64 fail_seq); 839892f396cSKishen Maloor int mptcp_pm_nl_mp_prio_send_ack(struct mptcp_sock *msk, 840892f396cSKishen Maloor struct mptcp_addr_info *addr, 841892f396cSKishen Maloor struct mptcp_addr_info *rem, 842892f396cSKishen Maloor u8 bkup); 8439ab4807cSKishen Maloor bool mptcp_pm_alloc_anno_list(struct mptcp_sock *msk, 844528cb5f2SGeliang Tang const struct mptcp_addr_info *addr); 845b6c08380SGeliang Tang void mptcp_pm_free_anno_list(struct mptcp_sock *msk); 8465bc56388SGeliang Tang bool mptcp_pm_sport_in_anno_list(struct mptcp_sock *msk, const struct sock *sk); 84700cfd77bSGeliang Tang struct mptcp_pm_add_entry * 84800cfd77bSGeliang Tang mptcp_pm_del_add_timer(struct mptcp_sock *msk, 84990d93088SPaolo Abeni const struct mptcp_addr_info *addr, bool check_id); 850d88c476fSGeliang Tang struct mptcp_pm_add_entry * 85190d93088SPaolo Abeni mptcp_lookup_anno_list_by_saddr(const struct mptcp_sock *msk, 85290d93088SPaolo Abeni const struct mptcp_addr_info *addr); 8538b201370SKishen Maloor int mptcp_pm_get_flags_and_ifindex_by_id(struct mptcp_sock *msk, 8548b201370SKishen Maloor unsigned int id, 8558b201370SKishen Maloor u8 *flags, int *ifindex); 856f40be0dbSGeliang Tang int mptcp_pm_nl_get_flags_and_ifindex_by_id(struct mptcp_sock *msk, unsigned int id, 857f40be0dbSGeliang Tang u8 *flags, int *ifindex); 8588b201370SKishen Maloor int mptcp_userspace_pm_get_flags_and_ifindex_by_id(struct mptcp_sock *msk, 8598b201370SKishen Maloor unsigned int id, 860ee285257SGeliang Tang u8 *flags, int *ifindex); 8616ba7ce89SGeliang Tang int mptcp_pm_set_flags(struct net *net, struct nlattr *token, 8626ba7ce89SGeliang Tang struct mptcp_pm_addr_entry *loc, 8636ba7ce89SGeliang Tang struct mptcp_pm_addr_entry *rem, u8 bkup); 8646ba7ce89SGeliang Tang int mptcp_pm_nl_set_flags(struct net *net, struct mptcp_pm_addr_entry *addr, u8 bkup); 865892f396cSKishen Maloor int mptcp_userspace_pm_set_flags(struct net *net, struct nlattr *token, 866892f396cSKishen Maloor struct mptcp_pm_addr_entry *loc, 867892f396cSKishen Maloor struct mptcp_pm_addr_entry *rem, u8 bkup); 8681b1c7a0eSPeter Krystad int mptcp_pm_announce_addr(struct mptcp_sock *msk, 8696a6c05a8SGeliang Tang const struct mptcp_addr_info *addr, 870f7efc777SGeliang Tang bool echo); 871cbde2787SGeliang Tang int mptcp_pm_remove_addr(struct mptcp_sock *msk, const struct mptcp_rm_list *rm_list); 872ddd14bb8SGeliang Tang int mptcp_pm_remove_subflow(struct mptcp_sock *msk, const struct mptcp_rm_list *rm_list); 8738b1c94daSGeliang Tang void mptcp_pm_remove_addrs(struct mptcp_sock *msk, struct list_head *rm_list); 874d9a4594eSKishen Maloor void mptcp_pm_remove_addrs_and_subflows(struct mptcp_sock *msk, 875d9a4594eSKishen Maloor struct list_head *rm_list); 876d9a4594eSKishen Maloor 8774638de5aSKishen Maloor void mptcp_free_local_addr_list(struct mptcp_sock *msk); 8781b1c7a0eSPeter Krystad 879b911c97cSFlorian Westphal void mptcp_event(enum mptcp_event_type type, const struct mptcp_sock *msk, 880b911c97cSFlorian Westphal const struct sock *ssk, gfp_t gfp); 881d1ace2d9SKishen Maloor void mptcp_event_addr_announced(const struct sock *ssk, const struct mptcp_addr_info *info); 882b911c97cSFlorian Westphal void mptcp_event_addr_removed(const struct mptcp_sock *msk, u8 id); 883f8c9dfbdSGeliang Tang void mptcp_event_pm_listener(const struct sock *ssk, 884f8c9dfbdSGeliang Tang enum mptcp_event_type event); 8854d25247dSKishen Maloor bool mptcp_userspace_pm_active(const struct mptcp_sock *msk); 886b911c97cSFlorian Westphal 887dfc8d060SDmytro Shytyi void mptcp_fastopen_gen_msk_ackseq(struct mptcp_sock *msk, struct mptcp_subflow_context *subflow, 888dfc8d060SDmytro Shytyi const struct mptcp_options_received *mp_opt); 88936b122baSDmytro Shytyi void mptcp_fastopen_subflow_synack_set_params(struct mptcp_subflow_context *subflow, 89036b122baSDmytro Shytyi struct request_sock *req); 891dfc8d060SDmytro Shytyi 892f643b803SGeliang Tang static inline bool mptcp_pm_should_add_signal(struct mptcp_sock *msk) 8931b1c7a0eSPeter Krystad { 89418fc1a92SYonglong Li return READ_ONCE(msk->pm.addr_signal) & 89518fc1a92SYonglong Li (BIT(MPTCP_ADD_ADDR_SIGNAL) | BIT(MPTCP_ADD_ADDR_ECHO)); 89618fc1a92SYonglong Li } 89718fc1a92SYonglong Li 89818fc1a92SYonglong Li static inline bool mptcp_pm_should_add_signal_addr(struct mptcp_sock *msk) 89918fc1a92SYonglong Li { 90013ad9f01SGeliang Tang return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_SIGNAL); 901d91d322aSGeliang Tang } 902d91d322aSGeliang Tang 903d91d322aSGeliang Tang static inline bool mptcp_pm_should_add_signal_echo(struct mptcp_sock *msk) 904d91d322aSGeliang Tang { 90513ad9f01SGeliang Tang return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_ECHO); 9061b1c7a0eSPeter Krystad } 9071b1c7a0eSPeter Krystad 9085cb104aeSGeliang Tang static inline bool mptcp_pm_should_rm_signal(struct mptcp_sock *msk) 9095cb104aeSGeliang Tang { 91013ad9f01SGeliang Tang return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_RM_ADDR_SIGNAL); 9115cb104aeSGeliang Tang } 9125cb104aeSGeliang Tang 91314b06811SMat Martineau static inline bool mptcp_pm_is_userspace(const struct mptcp_sock *msk) 91414b06811SMat Martineau { 91514b06811SMat Martineau return READ_ONCE(msk->pm.pm_type) == MPTCP_PM_TYPE_USERSPACE; 91614b06811SMat Martineau } 91714b06811SMat Martineau 9184d25247dSKishen Maloor static inline bool mptcp_pm_is_kernel(const struct mptcp_sock *msk) 9194d25247dSKishen Maloor { 9204d25247dSKishen Maloor return READ_ONCE(msk->pm.pm_type) == MPTCP_PM_TYPE_KERNEL; 9214d25247dSKishen Maloor } 9224d25247dSKishen Maloor 9234a2777a8SGeliang Tang static inline unsigned int mptcp_add_addr_len(int family, bool echo, bool port) 9241b1c7a0eSPeter Krystad { 9252ec72faeSGeliang Tang u8 len = TCPOLEN_MPTCP_ADD_ADDR_BASE; 9262ec72faeSGeliang Tang 9272ec72faeSGeliang Tang if (family == AF_INET6) 9282ec72faeSGeliang Tang len = TCPOLEN_MPTCP_ADD_ADDR6_BASE; 9292ec72faeSGeliang Tang if (!echo) 9302ec72faeSGeliang Tang len += MPTCPOPT_THMAC_LEN; 93127ab92d9SDavide Caratti /* account for 2 trailing 'nop' options */ 9324a2777a8SGeliang Tang if (port) 93327ab92d9SDavide Caratti len += TCPOLEN_MPTCP_PORT_LEN + TCPOLEN_MPTCP_PORT_ALIGN; 9342ec72faeSGeliang Tang 9352ec72faeSGeliang Tang return len; 9361b1c7a0eSPeter Krystad } 9371b1c7a0eSPeter Krystad 9386445e17aSGeliang Tang static inline int mptcp_rm_addr_len(const struct mptcp_rm_list *rm_list) 9396445e17aSGeliang Tang { 9406445e17aSGeliang Tang if (rm_list->nr == 0 || rm_list->nr > MPTCP_RM_IDS_MAX) 9416445e17aSGeliang Tang return -EINVAL; 9426445e17aSGeliang Tang 9436445e17aSGeliang Tang return TCPOLEN_MPTCP_RM_ADDR_BASE + roundup(rm_list->nr - 1, 4) + 1; 9446445e17aSGeliang Tang } 9456445e17aSGeliang Tang 94690d93088SPaolo Abeni bool mptcp_pm_add_addr_signal(struct mptcp_sock *msk, const struct sk_buff *skb, 9471f5e9e2fSYonglong Li unsigned int opt_size, unsigned int remaining, 948f462a446SYonglong Li struct mptcp_addr_info *addr, bool *echo, 949af7939f3SGeliang Tang bool *drop_other_suboptions); 9505cb104aeSGeliang Tang bool mptcp_pm_rm_addr_signal(struct mptcp_sock *msk, unsigned int remaining, 9516445e17aSGeliang Tang struct mptcp_rm_list *rm_list); 9521b1c7a0eSPeter Krystad int mptcp_pm_get_local_id(struct mptcp_sock *msk, struct sock_common *skc); 9539bbec87eSGeliang Tang int mptcp_pm_nl_get_local_id(struct mptcp_sock *msk, struct mptcp_addr_info *skc); 9548b201370SKishen Maloor int mptcp_userspace_pm_get_local_id(struct mptcp_sock *msk, struct mptcp_addr_info *skc); 9551b1c7a0eSPeter Krystad 956d39dcecaSPaolo Abeni void __init mptcp_pm_nl_init(void); 957e9801430SFlorian Westphal void mptcp_pm_nl_work(struct mptcp_sock *msk); 958ddd14bb8SGeliang Tang void mptcp_pm_nl_rm_subflow_received(struct mptcp_sock *msk, 959ddd14bb8SGeliang Tang const struct mptcp_rm_list *rm_list); 96090d93088SPaolo Abeni unsigned int mptcp_pm_get_add_addr_signal_max(const struct mptcp_sock *msk); 96190d93088SPaolo Abeni unsigned int mptcp_pm_get_add_addr_accept_max(const struct mptcp_sock *msk); 96290d93088SPaolo Abeni unsigned int mptcp_pm_get_subflows_max(const struct mptcp_sock *msk); 96390d93088SPaolo Abeni unsigned int mptcp_pm_get_local_addr_max(const struct mptcp_sock *msk); 96401cacb00SPaolo Abeni 96595d68651SPaolo Abeni /* called under PM lock */ 96695d68651SPaolo Abeni static inline void __mptcp_pm_close_subflow(struct mptcp_sock *msk) 96795d68651SPaolo Abeni { 96895d68651SPaolo Abeni if (--msk->pm.subflows < mptcp_pm_get_subflows_max(msk)) 96995d68651SPaolo Abeni WRITE_ONCE(msk->pm.accept_subflow, true); 97095d68651SPaolo Abeni } 97195d68651SPaolo Abeni 97295d68651SPaolo Abeni static inline void mptcp_pm_close_subflow(struct mptcp_sock *msk) 97395d68651SPaolo Abeni { 97495d68651SPaolo Abeni spin_lock_bh(&msk->pm.lock); 97595d68651SPaolo Abeni __mptcp_pm_close_subflow(msk); 97695d68651SPaolo Abeni spin_unlock_bh(&msk->pm.lock); 97795d68651SPaolo Abeni } 97895d68651SPaolo Abeni 97978962489SFlorian Westphal void mptcp_sockopt_sync(struct mptcp_sock *msk, struct sock *ssk); 9803e501490SPaolo Abeni void mptcp_sockopt_sync_locked(struct mptcp_sock *msk, struct sock *ssk); 98178962489SFlorian Westphal 982dc87efdbSFlorian Westphal static inline struct mptcp_ext *mptcp_get_ext(const struct sk_buff *skb) 9836d0060f6SMat Martineau { 9846d0060f6SMat Martineau return (struct mptcp_ext *)skb_ext_find(skb, SKB_EXT_MPTCP); 9856d0060f6SMat Martineau } 9866d0060f6SMat Martineau 9875147dfb5SDavide Caratti void mptcp_diag_subflow_init(struct tcp_ulp_ops *ops); 9885147dfb5SDavide Caratti 989d5f49190SPaolo Abeni static inline bool __mptcp_check_fallback(const struct mptcp_sock *msk) 990e1ff9e82SDavide Caratti { 991e1ff9e82SDavide Caratti return test_bit(MPTCP_FALLBACK_DONE, &msk->flags); 992e1ff9e82SDavide Caratti } 993e1ff9e82SDavide Caratti 994d5f49190SPaolo Abeni static inline bool mptcp_check_fallback(const struct sock *sk) 995e1ff9e82SDavide Caratti { 996e1ff9e82SDavide Caratti struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); 997e1ff9e82SDavide Caratti struct mptcp_sock *msk = mptcp_sk(subflow->conn); 998e1ff9e82SDavide Caratti 999e1ff9e82SDavide Caratti return __mptcp_check_fallback(msk); 1000e1ff9e82SDavide Caratti } 1001e1ff9e82SDavide Caratti 1002e1ff9e82SDavide Caratti static inline void __mptcp_do_fallback(struct mptcp_sock *msk) 1003e1ff9e82SDavide Caratti { 1004e1ff9e82SDavide Caratti if (test_bit(MPTCP_FALLBACK_DONE, &msk->flags)) { 1005e1ff9e82SDavide Caratti pr_debug("TCP fallback already done (msk=%p)", msk); 1006e1ff9e82SDavide Caratti return; 1007e1ff9e82SDavide Caratti } 1008e1ff9e82SDavide Caratti set_bit(MPTCP_FALLBACK_DONE, &msk->flags); 1009e1ff9e82SDavide Caratti } 1010e1ff9e82SDavide Caratti 1011d51991e2SPaolo Abeni static inline void mptcp_do_fallback(struct sock *ssk) 1012e1ff9e82SDavide Caratti { 1013d51991e2SPaolo Abeni struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); 1014d51991e2SPaolo Abeni struct sock *sk = subflow->conn; 1015d51991e2SPaolo Abeni struct mptcp_sock *msk; 1016e1ff9e82SDavide Caratti 1017d51991e2SPaolo Abeni msk = mptcp_sk(sk); 1018e1ff9e82SDavide Caratti __mptcp_do_fallback(msk); 1019d51991e2SPaolo Abeni if (READ_ONCE(msk->snd_data_fin_enable) && !(ssk->sk_shutdown & SEND_SHUTDOWN)) { 1020d51991e2SPaolo Abeni gfp_t saved_allocation = ssk->sk_allocation; 1021d51991e2SPaolo Abeni 1022d51991e2SPaolo Abeni /* we are in a atomic (BH) scope, override ssk default for data 1023d51991e2SPaolo Abeni * fin allocation 1024d51991e2SPaolo Abeni */ 1025d51991e2SPaolo Abeni ssk->sk_allocation = GFP_ATOMIC; 1026d51991e2SPaolo Abeni ssk->sk_shutdown |= SEND_SHUTDOWN; 1027d51991e2SPaolo Abeni tcp_shutdown(ssk, SEND_SHUTDOWN); 1028d51991e2SPaolo Abeni ssk->sk_allocation = saved_allocation; 1029d51991e2SPaolo Abeni } 1030e1ff9e82SDavide Caratti } 1031e1ff9e82SDavide Caratti 1032e1ff9e82SDavide Caratti #define pr_fallback(a) pr_debug("%s:fallback to TCP (msk=%p)", __func__, a) 1033e1ff9e82SDavide Caratti 10341e39e5a3SGeliang Tang static inline bool mptcp_check_infinite_map(struct sk_buff *skb) 10351e39e5a3SGeliang Tang { 10361e39e5a3SGeliang Tang struct mptcp_ext *mpext; 10371e39e5a3SGeliang Tang 10381e39e5a3SGeliang Tang mpext = skb ? mptcp_get_ext(skb) : NULL; 10391e39e5a3SGeliang Tang if (mpext && mpext->infinite_map) 10401e39e5a3SGeliang Tang return true; 10411e39e5a3SGeliang Tang 10421e39e5a3SGeliang Tang return false; 10431e39e5a3SGeliang Tang } 10441e39e5a3SGeliang Tang 104570c708e8SKishen Maloor static inline bool is_active_ssk(struct mptcp_subflow_context *subflow) 104670c708e8SKishen Maloor { 104770c708e8SKishen Maloor return (subflow->request_mptcp || subflow->request_join); 104870c708e8SKishen Maloor } 104970c708e8SKishen Maloor 10508fd73804SDavide Caratti static inline bool subflow_simultaneous_connect(struct sock *sk) 10518fd73804SDavide Caratti { 10528fd73804SDavide Caratti struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); 10538fd73804SDavide Caratti 10548fd73804SDavide Caratti return sk->sk_state == TCP_ESTABLISHED && 105570c708e8SKishen Maloor is_active_ssk(subflow) && 10568fd73804SDavide Caratti !subflow->conn_finished; 10578fd73804SDavide Caratti } 10588fd73804SDavide Caratti 10599466a1ccSFlorian Westphal #ifdef CONFIG_SYN_COOKIES 10609466a1ccSFlorian Westphal void subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req, 10619466a1ccSFlorian Westphal struct sk_buff *skb); 10629466a1ccSFlorian Westphal bool mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req, 10639466a1ccSFlorian Westphal struct sk_buff *skb); 10649466a1ccSFlorian Westphal void __init mptcp_join_cookie_init(void); 10659466a1ccSFlorian Westphal #else 10669466a1ccSFlorian Westphal static inline void 10679466a1ccSFlorian Westphal subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req, 10689466a1ccSFlorian Westphal struct sk_buff *skb) {} 10699466a1ccSFlorian Westphal static inline bool 10709466a1ccSFlorian Westphal mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req, 10719466a1ccSFlorian Westphal struct sk_buff *skb) 10729466a1ccSFlorian Westphal { 10739466a1ccSFlorian Westphal return false; 10749466a1ccSFlorian Westphal } 10759466a1ccSFlorian Westphal 10769466a1ccSFlorian Westphal static inline void mptcp_join_cookie_init(void) {} 10779466a1ccSFlorian Westphal #endif 10789466a1ccSFlorian Westphal 1079f870fa0bSMat Martineau #endif /* __MPTCP_PROTOCOL_H */ 1080