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797 lines
23 KiB
797 lines
23 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* Multipath TCP |
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* |
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* Copyright (c) 2017 - 2019, Intel Corporation. |
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*/ |
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#ifndef __MPTCP_PROTOCOL_H |
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#define __MPTCP_PROTOCOL_H |
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#include <linux/random.h> |
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#include <net/tcp.h> |
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#include <net/inet_connection_sock.h> |
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#include <uapi/linux/mptcp.h> |
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#define MPTCP_SUPPORTED_VERSION 1 |
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/* MPTCP option bits */ |
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#define OPTION_MPTCP_MPC_SYN BIT(0) |
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#define OPTION_MPTCP_MPC_SYNACK BIT(1) |
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#define OPTION_MPTCP_MPC_ACK BIT(2) |
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#define OPTION_MPTCP_MPJ_SYN BIT(3) |
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#define OPTION_MPTCP_MPJ_SYNACK BIT(4) |
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#define OPTION_MPTCP_MPJ_ACK BIT(5) |
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#define OPTION_MPTCP_ADD_ADDR BIT(6) |
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#define OPTION_MPTCP_ADD_ADDR6 BIT(7) |
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#define OPTION_MPTCP_RM_ADDR BIT(8) |
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#define OPTION_MPTCP_FASTCLOSE BIT(9) |
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#define OPTION_MPTCP_PRIO BIT(10) |
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/* MPTCP option subtypes */ |
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#define MPTCPOPT_MP_CAPABLE 0 |
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#define MPTCPOPT_MP_JOIN 1 |
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#define MPTCPOPT_DSS 2 |
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#define MPTCPOPT_ADD_ADDR 3 |
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#define MPTCPOPT_RM_ADDR 4 |
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#define MPTCPOPT_MP_PRIO 5 |
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#define MPTCPOPT_MP_FAIL 6 |
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#define MPTCPOPT_MP_FASTCLOSE 7 |
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/* MPTCP suboption lengths */ |
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#define TCPOLEN_MPTCP_MPC_SYN 4 |
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#define TCPOLEN_MPTCP_MPC_SYNACK 12 |
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#define TCPOLEN_MPTCP_MPC_ACK 20 |
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#define TCPOLEN_MPTCP_MPC_ACK_DATA 22 |
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#define TCPOLEN_MPTCP_MPJ_SYN 12 |
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#define TCPOLEN_MPTCP_MPJ_SYNACK 16 |
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#define TCPOLEN_MPTCP_MPJ_ACK 24 |
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#define TCPOLEN_MPTCP_DSS_BASE 4 |
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#define TCPOLEN_MPTCP_DSS_ACK32 4 |
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#define TCPOLEN_MPTCP_DSS_ACK64 8 |
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#define TCPOLEN_MPTCP_DSS_MAP32 10 |
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#define TCPOLEN_MPTCP_DSS_MAP64 14 |
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#define TCPOLEN_MPTCP_DSS_CHECKSUM 2 |
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#define TCPOLEN_MPTCP_ADD_ADDR 16 |
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#define TCPOLEN_MPTCP_ADD_ADDR_PORT 18 |
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#define TCPOLEN_MPTCP_ADD_ADDR_BASE 8 |
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#define TCPOLEN_MPTCP_ADD_ADDR_BASE_PORT 10 |
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#define TCPOLEN_MPTCP_ADD_ADDR6 28 |
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#define TCPOLEN_MPTCP_ADD_ADDR6_PORT 30 |
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#define TCPOLEN_MPTCP_ADD_ADDR6_BASE 20 |
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#define TCPOLEN_MPTCP_ADD_ADDR6_BASE_PORT 22 |
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#define TCPOLEN_MPTCP_PORT_LEN 2 |
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#define TCPOLEN_MPTCP_PORT_ALIGN 2 |
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#define TCPOLEN_MPTCP_RM_ADDR_BASE 4 |
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#define TCPOLEN_MPTCP_PRIO 3 |
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#define TCPOLEN_MPTCP_PRIO_ALIGN 4 |
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#define TCPOLEN_MPTCP_FASTCLOSE 12 |
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/* MPTCP MP_JOIN flags */ |
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#define MPTCPOPT_BACKUP BIT(0) |
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#define MPTCPOPT_HMAC_LEN 20 |
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#define MPTCPOPT_THMAC_LEN 8 |
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/* MPTCP MP_CAPABLE flags */ |
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#define MPTCP_VERSION_MASK (0x0F) |
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#define MPTCP_CAP_CHECKSUM_REQD BIT(7) |
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#define MPTCP_CAP_EXTENSIBILITY BIT(6) |
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#define MPTCP_CAP_HMAC_SHA256 BIT(0) |
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#define MPTCP_CAP_FLAG_MASK (0x3F) |
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/* MPTCP DSS flags */ |
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#define MPTCP_DSS_DATA_FIN BIT(4) |
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#define MPTCP_DSS_DSN64 BIT(3) |
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#define MPTCP_DSS_HAS_MAP BIT(2) |
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#define MPTCP_DSS_ACK64 BIT(1) |
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#define MPTCP_DSS_HAS_ACK BIT(0) |
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#define MPTCP_DSS_FLAG_MASK (0x1F) |
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/* MPTCP ADD_ADDR flags */ |
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#define MPTCP_ADDR_ECHO BIT(0) |
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#define MPTCP_ADDR_IPVERSION_4 4 |
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#define MPTCP_ADDR_IPVERSION_6 6 |
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/* MPTCP MP_PRIO flags */ |
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#define MPTCP_PRIO_BKUP BIT(0) |
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/* MPTCP socket flags */ |
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#define MPTCP_DATA_READY 0 |
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#define MPTCP_NOSPACE 1 |
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#define MPTCP_WORK_RTX 2 |
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#define MPTCP_WORK_EOF 3 |
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#define MPTCP_FALLBACK_DONE 4 |
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#define MPTCP_WORK_CLOSE_SUBFLOW 5 |
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#define MPTCP_PUSH_PENDING 6 |
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#define MPTCP_CLEAN_UNA 7 |
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#define MPTCP_ERROR_REPORT 8 |
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static inline bool before64(__u64 seq1, __u64 seq2) |
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{ |
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return (__s64)(seq1 - seq2) < 0; |
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} |
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#define after64(seq2, seq1) before64(seq1, seq2) |
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struct mptcp_options_received { |
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u64 sndr_key; |
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u64 rcvr_key; |
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u64 data_ack; |
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u64 data_seq; |
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u32 subflow_seq; |
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u16 data_len; |
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u16 mp_capable : 1, |
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mp_join : 1, |
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fastclose : 1, |
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dss : 1, |
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add_addr : 1, |
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rm_addr : 1, |
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mp_prio : 1, |
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family : 4, |
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echo : 1, |
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backup : 1; |
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u32 token; |
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u32 nonce; |
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u64 thmac; |
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u8 hmac[MPTCPOPT_HMAC_LEN]; |
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u8 join_id; |
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u8 use_map:1, |
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dsn64:1, |
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data_fin:1, |
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use_ack:1, |
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ack64:1, |
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mpc_map:1, |
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__unused:2; |
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u8 addr_id; |
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u8 rm_id; |
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union { |
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struct in_addr addr; |
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#if IS_ENABLED(CONFIG_MPTCP_IPV6) |
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struct in6_addr addr6; |
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#endif |
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}; |
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u64 ahmac; |
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u16 port; |
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}; |
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static inline __be32 mptcp_option(u8 subopt, u8 len, u8 nib, u8 field) |
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{ |
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return htonl((TCPOPT_MPTCP << 24) | (len << 16) | (subopt << 12) | |
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((nib & 0xF) << 8) | field); |
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} |
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struct mptcp_addr_info { |
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sa_family_t family; |
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__be16 port; |
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u8 id; |
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u8 flags; |
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int ifindex; |
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union { |
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struct in_addr addr; |
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#if IS_ENABLED(CONFIG_MPTCP_IPV6) |
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struct in6_addr addr6; |
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#endif |
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}; |
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}; |
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enum mptcp_pm_status { |
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MPTCP_PM_ADD_ADDR_RECEIVED, |
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MPTCP_PM_ADD_ADDR_SEND_ACK, |
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MPTCP_PM_RM_ADDR_RECEIVED, |
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MPTCP_PM_ESTABLISHED, |
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MPTCP_PM_ALREADY_ESTABLISHED, /* persistent status, set after ESTABLISHED event */ |
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MPTCP_PM_SUBFLOW_ESTABLISHED, |
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}; |
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enum mptcp_addr_signal_status { |
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MPTCP_ADD_ADDR_SIGNAL, |
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MPTCP_ADD_ADDR_ECHO, |
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MPTCP_ADD_ADDR_IPV6, |
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MPTCP_ADD_ADDR_PORT, |
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MPTCP_RM_ADDR_SIGNAL, |
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}; |
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struct mptcp_pm_data { |
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struct mptcp_addr_info local; |
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struct mptcp_addr_info remote; |
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struct list_head anno_list; |
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spinlock_t lock; /*protects the whole PM data */ |
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u8 addr_signal; |
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bool server_side; |
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bool work_pending; |
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bool accept_addr; |
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bool accept_subflow; |
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u8 add_addr_signaled; |
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u8 add_addr_accepted; |
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u8 local_addr_used; |
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u8 subflows; |
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u8 status; |
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u8 rm_id; |
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}; |
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struct mptcp_data_frag { |
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struct list_head list; |
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u64 data_seq; |
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u16 data_len; |
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u16 offset; |
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u16 overhead; |
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u16 already_sent; |
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struct page *page; |
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}; |
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/* MPTCP connection sock */ |
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struct mptcp_sock { |
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/* inet_connection_sock must be the first member */ |
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struct inet_connection_sock sk; |
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u64 local_key; |
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u64 remote_key; |
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u64 write_seq; |
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u64 snd_nxt; |
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u64 ack_seq; |
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u64 rcv_wnd_sent; |
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u64 rcv_data_fin_seq; |
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int wmem_reserved; |
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struct sock *last_snd; |
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int snd_burst; |
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int old_wspace; |
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u64 snd_una; |
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u64 wnd_end; |
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unsigned long timer_ival; |
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u32 token; |
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int rmem_released; |
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unsigned long flags; |
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bool can_ack; |
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bool fully_established; |
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bool rcv_data_fin; |
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bool snd_data_fin_enable; |
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bool rcv_fastclose; |
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bool use_64bit_ack; /* Set when we received a 64-bit DSN */ |
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spinlock_t join_list_lock; |
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struct sock *ack_hint; |
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struct work_struct work; |
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struct sk_buff *ooo_last_skb; |
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struct rb_root out_of_order_queue; |
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struct sk_buff_head receive_queue; |
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struct sk_buff_head skb_tx_cache; /* this is wmem accounted */ |
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int tx_pending_data; |
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int size_goal_cache; |
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struct list_head conn_list; |
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struct list_head rtx_queue; |
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struct mptcp_data_frag *first_pending; |
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struct list_head join_list; |
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struct socket *subflow; /* outgoing connect/listener/!mp_capable */ |
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struct sock *first; |
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struct mptcp_pm_data pm; |
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struct { |
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u32 space; /* bytes copied in last measurement window */ |
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u32 copied; /* bytes copied in this measurement window */ |
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u64 time; /* start time of measurement window */ |
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u64 rtt_us; /* last maximum rtt of subflows */ |
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} rcvq_space; |
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}; |
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#define mptcp_lock_sock(___sk, cb) do { \ |
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struct sock *__sk = (___sk); /* silence macro reuse warning */ \ |
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might_sleep(); \ |
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spin_lock_bh(&__sk->sk_lock.slock); \ |
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if (__sk->sk_lock.owned) \ |
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__lock_sock(__sk); \ |
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cb; \ |
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__sk->sk_lock.owned = 1; \ |
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spin_unlock(&__sk->sk_lock.slock); \ |
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mutex_acquire(&__sk->sk_lock.dep_map, 0, 0, _RET_IP_); \ |
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local_bh_enable(); \ |
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} while (0) |
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#define mptcp_data_lock(sk) spin_lock_bh(&(sk)->sk_lock.slock) |
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#define mptcp_data_unlock(sk) spin_unlock_bh(&(sk)->sk_lock.slock) |
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#define mptcp_for_each_subflow(__msk, __subflow) \ |
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list_for_each_entry(__subflow, &((__msk)->conn_list), node) |
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static inline void msk_owned_by_me(const struct mptcp_sock *msk) |
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{ |
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sock_owned_by_me((const struct sock *)msk); |
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} |
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static inline struct mptcp_sock *mptcp_sk(const struct sock *sk) |
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{ |
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return (struct mptcp_sock *)sk; |
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} |
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static inline int __mptcp_space(const struct sock *sk) |
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{ |
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return tcp_space(sk) + READ_ONCE(mptcp_sk(sk)->rmem_released); |
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} |
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static inline struct mptcp_data_frag *mptcp_send_head(const struct sock *sk) |
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{ |
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const struct mptcp_sock *msk = mptcp_sk(sk); |
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return READ_ONCE(msk->first_pending); |
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} |
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static inline struct mptcp_data_frag *mptcp_send_next(struct sock *sk) |
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{ |
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struct mptcp_sock *msk = mptcp_sk(sk); |
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struct mptcp_data_frag *cur; |
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cur = msk->first_pending; |
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return list_is_last(&cur->list, &msk->rtx_queue) ? NULL : |
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list_next_entry(cur, list); |
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} |
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static inline struct mptcp_data_frag *mptcp_pending_tail(const struct sock *sk) |
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{ |
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struct mptcp_sock *msk = mptcp_sk(sk); |
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if (!msk->first_pending) |
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return NULL; |
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if (WARN_ON_ONCE(list_empty(&msk->rtx_queue))) |
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return NULL; |
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return list_last_entry(&msk->rtx_queue, struct mptcp_data_frag, list); |
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} |
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static inline struct mptcp_data_frag *mptcp_rtx_head(const struct sock *sk) |
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{ |
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struct mptcp_sock *msk = mptcp_sk(sk); |
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if (msk->snd_una == READ_ONCE(msk->snd_nxt)) |
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return NULL; |
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return list_first_entry_or_null(&msk->rtx_queue, struct mptcp_data_frag, list); |
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} |
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struct mptcp_subflow_request_sock { |
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struct tcp_request_sock sk; |
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u16 mp_capable : 1, |
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mp_join : 1, |
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backup : 1; |
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u8 local_id; |
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u8 remote_id; |
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u64 local_key; |
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u64 idsn; |
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u32 token; |
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u32 ssn_offset; |
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u64 thmac; |
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u32 local_nonce; |
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u32 remote_nonce; |
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struct mptcp_sock *msk; |
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struct hlist_nulls_node token_node; |
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}; |
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static inline struct mptcp_subflow_request_sock * |
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mptcp_subflow_rsk(const struct request_sock *rsk) |
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{ |
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return (struct mptcp_subflow_request_sock *)rsk; |
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} |
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enum mptcp_data_avail { |
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MPTCP_SUBFLOW_NODATA, |
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MPTCP_SUBFLOW_DATA_AVAIL, |
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MPTCP_SUBFLOW_OOO_DATA |
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}; |
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struct mptcp_delegated_action { |
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struct napi_struct napi; |
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struct list_head head; |
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}; |
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DECLARE_PER_CPU(struct mptcp_delegated_action, mptcp_delegated_actions); |
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#define MPTCP_DELEGATE_SEND 0 |
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/* MPTCP subflow context */ |
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struct mptcp_subflow_context { |
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struct list_head node;/* conn_list of subflows */ |
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u64 local_key; |
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u64 remote_key; |
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u64 idsn; |
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u64 map_seq; |
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u32 snd_isn; |
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u32 token; |
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u32 rel_write_seq; |
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u32 map_subflow_seq; |
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u32 ssn_offset; |
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u32 map_data_len; |
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u32 request_mptcp : 1, /* send MP_CAPABLE */ |
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request_join : 1, /* send MP_JOIN */ |
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request_bkup : 1, |
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mp_capable : 1, /* remote is MPTCP capable */ |
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mp_join : 1, /* remote is JOINing */ |
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fully_established : 1, /* path validated */ |
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pm_notified : 1, /* PM hook called for established status */ |
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conn_finished : 1, |
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map_valid : 1, |
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mpc_map : 1, |
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backup : 1, |
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send_mp_prio : 1, |
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rx_eof : 1, |
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can_ack : 1, /* only after processing the remote a key */ |
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disposable : 1; /* ctx can be free at ulp release time */ |
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enum mptcp_data_avail data_avail; |
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u32 remote_nonce; |
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u64 thmac; |
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u32 local_nonce; |
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u32 remote_token; |
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u8 hmac[MPTCPOPT_HMAC_LEN]; |
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u8 local_id; |
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u8 remote_id; |
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long delegated_status; |
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struct list_head delegated_node; /* link into delegated_action, protected by local BH */ |
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struct sock *tcp_sock; /* tcp sk backpointer */ |
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struct sock *conn; /* parent mptcp_sock */ |
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const struct inet_connection_sock_af_ops *icsk_af_ops; |
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void (*tcp_data_ready)(struct sock *sk); |
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void (*tcp_state_change)(struct sock *sk); |
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void (*tcp_write_space)(struct sock *sk); |
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void (*tcp_error_report)(struct sock *sk); |
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struct rcu_head rcu; |
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}; |
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static inline struct mptcp_subflow_context * |
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mptcp_subflow_ctx(const struct sock *sk) |
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{ |
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struct inet_connection_sock *icsk = inet_csk(sk); |
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/* Use RCU on icsk_ulp_data only for sock diag code */ |
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return (__force struct mptcp_subflow_context *)icsk->icsk_ulp_data; |
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} |
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static inline struct sock * |
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mptcp_subflow_tcp_sock(const struct mptcp_subflow_context *subflow) |
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{ |
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return subflow->tcp_sock; |
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} |
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static inline u64 |
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mptcp_subflow_get_map_offset(const struct mptcp_subflow_context *subflow) |
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{ |
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return tcp_sk(mptcp_subflow_tcp_sock(subflow))->copied_seq - |
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subflow->ssn_offset - |
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subflow->map_subflow_seq; |
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} |
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static inline u64 |
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mptcp_subflow_get_mapped_dsn(const struct mptcp_subflow_context *subflow) |
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{ |
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return subflow->map_seq + mptcp_subflow_get_map_offset(subflow); |
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} |
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static inline void mptcp_add_pending_subflow(struct mptcp_sock *msk, |
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struct mptcp_subflow_context *subflow) |
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{ |
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sock_hold(mptcp_subflow_tcp_sock(subflow)); |
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spin_lock_bh(&msk->join_list_lock); |
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list_add_tail(&subflow->node, &msk->join_list); |
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spin_unlock_bh(&msk->join_list_lock); |
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} |
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void mptcp_subflow_process_delegated(struct sock *ssk); |
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static inline void mptcp_subflow_delegate(struct mptcp_subflow_context *subflow) |
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{ |
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struct mptcp_delegated_action *delegated; |
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bool schedule; |
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/* The implied barrier pairs with mptcp_subflow_delegated_done(), and |
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* ensures the below list check sees list updates done prior to status |
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* bit changes |
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*/ |
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if (!test_and_set_bit(MPTCP_DELEGATE_SEND, &subflow->delegated_status)) { |
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/* still on delegated list from previous scheduling */ |
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if (!list_empty(&subflow->delegated_node)) |
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return; |
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/* the caller held the subflow bh socket lock */ |
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lockdep_assert_in_softirq(); |
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delegated = this_cpu_ptr(&mptcp_delegated_actions); |
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schedule = list_empty(&delegated->head); |
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list_add_tail(&subflow->delegated_node, &delegated->head); |
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sock_hold(mptcp_subflow_tcp_sock(subflow)); |
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if (schedule) |
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napi_schedule(&delegated->napi); |
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} |
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} |
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static inline struct mptcp_subflow_context * |
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mptcp_subflow_delegated_next(struct mptcp_delegated_action *delegated) |
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{ |
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struct mptcp_subflow_context *ret; |
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if (list_empty(&delegated->head)) |
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return NULL; |
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ret = list_first_entry(&delegated->head, struct mptcp_subflow_context, delegated_node); |
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list_del_init(&ret->delegated_node); |
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return ret; |
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} |
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static inline bool mptcp_subflow_has_delegated_action(const struct mptcp_subflow_context *subflow) |
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{ |
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return test_bit(MPTCP_DELEGATE_SEND, &subflow->delegated_status); |
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} |
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static inline void mptcp_subflow_delegated_done(struct mptcp_subflow_context *subflow) |
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{ |
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/* pairs with mptcp_subflow_delegate, ensures delegate_node is updated before |
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* touching the status bit |
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*/ |
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smp_wmb(); |
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clear_bit(MPTCP_DELEGATE_SEND, &subflow->delegated_status); |
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} |
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int mptcp_is_enabled(struct net *net); |
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unsigned int mptcp_get_add_addr_timeout(struct net *net); |
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void mptcp_subflow_fully_established(struct mptcp_subflow_context *subflow, |
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struct mptcp_options_received *mp_opt); |
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bool mptcp_subflow_data_available(struct sock *sk); |
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void __init mptcp_subflow_init(void); |
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void mptcp_subflow_shutdown(struct sock *sk, struct sock *ssk, int how); |
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void mptcp_close_ssk(struct sock *sk, struct sock *ssk, |
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struct mptcp_subflow_context *subflow); |
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void mptcp_subflow_reset(struct sock *ssk); |
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void mptcp_sock_graft(struct sock *sk, struct socket *parent); |
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struct socket *__mptcp_nmpc_socket(const struct mptcp_sock *msk); |
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|
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/* called with sk socket lock held */ |
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int __mptcp_subflow_connect(struct sock *sk, const struct mptcp_addr_info *loc, |
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const struct mptcp_addr_info *remote); |
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int mptcp_subflow_create_socket(struct sock *sk, struct socket **new_sock); |
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void mptcp_info2sockaddr(const struct mptcp_addr_info *info, |
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struct sockaddr_storage *addr, |
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unsigned short family); |
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|
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static inline void mptcp_subflow_tcp_fallback(struct sock *sk, |
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struct mptcp_subflow_context *ctx) |
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{ |
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sk->sk_data_ready = ctx->tcp_data_ready; |
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sk->sk_state_change = ctx->tcp_state_change; |
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sk->sk_write_space = ctx->tcp_write_space; |
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sk->sk_error_report = ctx->tcp_error_report; |
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|
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inet_csk(sk)->icsk_af_ops = ctx->icsk_af_ops; |
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} |
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void __init mptcp_proto_init(void); |
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#if IS_ENABLED(CONFIG_MPTCP_IPV6) |
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int __init mptcp_proto_v6_init(void); |
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#endif |
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struct sock *mptcp_sk_clone(const struct sock *sk, |
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const struct mptcp_options_received *mp_opt, |
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struct request_sock *req); |
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void mptcp_get_options(const struct sk_buff *skb, |
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struct mptcp_options_received *mp_opt); |
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|
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void mptcp_finish_connect(struct sock *sk); |
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static inline bool mptcp_is_fully_established(struct sock *sk) |
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{ |
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return inet_sk_state_load(sk) == TCP_ESTABLISHED && |
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READ_ONCE(mptcp_sk(sk)->fully_established); |
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} |
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void mptcp_rcv_space_init(struct mptcp_sock *msk, const struct sock *ssk); |
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void mptcp_data_ready(struct sock *sk, struct sock *ssk); |
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bool mptcp_finish_join(struct sock *sk); |
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bool mptcp_schedule_work(struct sock *sk); |
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void __mptcp_check_push(struct sock *sk, struct sock *ssk); |
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void __mptcp_data_acked(struct sock *sk); |
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void __mptcp_error_report(struct sock *sk); |
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void mptcp_subflow_eof(struct sock *sk); |
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bool mptcp_update_rcv_data_fin(struct mptcp_sock *msk, u64 data_fin_seq, bool use_64bit); |
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void __mptcp_flush_join_list(struct mptcp_sock *msk); |
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static inline bool mptcp_data_fin_enabled(const struct mptcp_sock *msk) |
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{ |
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return READ_ONCE(msk->snd_data_fin_enable) && |
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READ_ONCE(msk->write_seq) == READ_ONCE(msk->snd_nxt); |
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} |
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static inline bool mptcp_propagate_sndbuf(struct sock *sk, struct sock *ssk) |
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{ |
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if ((sk->sk_userlocks & SOCK_SNDBUF_LOCK) || ssk->sk_sndbuf <= READ_ONCE(sk->sk_sndbuf)) |
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return false; |
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|
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WRITE_ONCE(sk->sk_sndbuf, ssk->sk_sndbuf); |
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return true; |
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} |
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static inline void mptcp_write_space(struct sock *sk) |
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{ |
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if (sk_stream_is_writeable(sk)) { |
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/* pairs with memory barrier in mptcp_poll */ |
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smp_mb(); |
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if (test_and_clear_bit(MPTCP_NOSPACE, &mptcp_sk(sk)->flags)) |
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sk_stream_write_space(sk); |
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} |
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} |
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void mptcp_destroy_common(struct mptcp_sock *msk); |
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void __init mptcp_token_init(void); |
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static inline void mptcp_token_init_request(struct request_sock *req) |
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{ |
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mptcp_subflow_rsk(req)->token_node.pprev = NULL; |
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} |
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|
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int mptcp_token_new_request(struct request_sock *req); |
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void mptcp_token_destroy_request(struct request_sock *req); |
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int mptcp_token_new_connect(struct sock *sk); |
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void mptcp_token_accept(struct mptcp_subflow_request_sock *r, |
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struct mptcp_sock *msk); |
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bool mptcp_token_exists(u32 token); |
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struct mptcp_sock *mptcp_token_get_sock(u32 token); |
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struct mptcp_sock *mptcp_token_iter_next(const struct net *net, long *s_slot, |
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long *s_num); |
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void mptcp_token_destroy(struct mptcp_sock *msk); |
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|
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void mptcp_crypto_key_sha(u64 key, u32 *token, u64 *idsn); |
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|
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void mptcp_crypto_hmac_sha(u64 key1, u64 key2, u8 *msg, int len, void *hmac); |
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void __init mptcp_pm_init(void); |
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void mptcp_pm_data_init(struct mptcp_sock *msk); |
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void mptcp_pm_new_connection(struct mptcp_sock *msk, const struct sock *ssk, int server_side); |
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void mptcp_pm_fully_established(struct mptcp_sock *msk, const struct sock *ssk, gfp_t gfp); |
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bool mptcp_pm_allow_new_subflow(struct mptcp_sock *msk); |
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void mptcp_pm_connection_closed(struct mptcp_sock *msk); |
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void mptcp_pm_subflow_established(struct mptcp_sock *msk, |
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struct mptcp_subflow_context *subflow); |
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void mptcp_pm_subflow_closed(struct mptcp_sock *msk, u8 id); |
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void mptcp_pm_add_addr_received(struct mptcp_sock *msk, |
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const struct mptcp_addr_info *addr); |
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void mptcp_pm_add_addr_send_ack(struct mptcp_sock *msk); |
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void mptcp_pm_rm_addr_received(struct mptcp_sock *msk, u8 rm_id); |
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void mptcp_pm_mp_prio_received(struct sock *sk, u8 bkup); |
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int mptcp_pm_nl_mp_prio_send_ack(struct mptcp_sock *msk, |
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struct mptcp_addr_info *addr, |
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u8 bkup); |
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void mptcp_pm_free_anno_list(struct mptcp_sock *msk); |
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bool mptcp_pm_sport_in_anno_list(struct mptcp_sock *msk, const struct sock *sk); |
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struct mptcp_pm_add_entry * |
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mptcp_pm_del_add_timer(struct mptcp_sock *msk, |
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struct mptcp_addr_info *addr); |
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|
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int mptcp_pm_announce_addr(struct mptcp_sock *msk, |
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const struct mptcp_addr_info *addr, |
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bool echo, bool port); |
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int mptcp_pm_remove_addr(struct mptcp_sock *msk, u8 local_id); |
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int mptcp_pm_remove_subflow(struct mptcp_sock *msk, u8 local_id); |
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|
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void mptcp_event(enum mptcp_event_type type, const struct mptcp_sock *msk, |
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const struct sock *ssk, gfp_t gfp); |
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void mptcp_event_addr_announced(const struct mptcp_sock *msk, const struct mptcp_addr_info *info); |
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void mptcp_event_addr_removed(const struct mptcp_sock *msk, u8 id); |
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|
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static inline bool mptcp_pm_should_add_signal(struct mptcp_sock *msk) |
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{ |
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return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_SIGNAL); |
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} |
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|
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static inline bool mptcp_pm_should_add_signal_echo(struct mptcp_sock *msk) |
|
{ |
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return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_ECHO); |
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} |
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|
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static inline bool mptcp_pm_should_add_signal_ipv6(struct mptcp_sock *msk) |
|
{ |
|
return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_IPV6); |
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} |
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|
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static inline bool mptcp_pm_should_add_signal_port(struct mptcp_sock *msk) |
|
{ |
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return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_PORT); |
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} |
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|
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static inline bool mptcp_pm_should_rm_signal(struct mptcp_sock *msk) |
|
{ |
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return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_RM_ADDR_SIGNAL); |
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} |
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|
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static inline unsigned int mptcp_add_addr_len(int family, bool echo, bool port) |
|
{ |
|
u8 len = TCPOLEN_MPTCP_ADD_ADDR_BASE; |
|
|
|
if (family == AF_INET6) |
|
len = TCPOLEN_MPTCP_ADD_ADDR6_BASE; |
|
if (!echo) |
|
len += MPTCPOPT_THMAC_LEN; |
|
/* account for 2 trailing 'nop' options */ |
|
if (port) |
|
len += TCPOLEN_MPTCP_PORT_LEN + TCPOLEN_MPTCP_PORT_ALIGN; |
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|
|
return len; |
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} |
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|
|
bool mptcp_pm_add_addr_signal(struct mptcp_sock *msk, unsigned int remaining, |
|
struct mptcp_addr_info *saddr, bool *echo, bool *port); |
|
bool mptcp_pm_rm_addr_signal(struct mptcp_sock *msk, unsigned int remaining, |
|
u8 *rm_id); |
|
int mptcp_pm_get_local_id(struct mptcp_sock *msk, struct sock_common *skc); |
|
|
|
void __init mptcp_pm_nl_init(void); |
|
void mptcp_pm_nl_data_init(struct mptcp_sock *msk); |
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void mptcp_pm_nl_work(struct mptcp_sock *msk); |
|
void mptcp_pm_nl_rm_subflow_received(struct mptcp_sock *msk, u8 rm_id); |
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int mptcp_pm_nl_get_local_id(struct mptcp_sock *msk, struct sock_common *skc); |
|
unsigned int mptcp_pm_get_add_addr_signal_max(struct mptcp_sock *msk); |
|
unsigned int mptcp_pm_get_add_addr_accept_max(struct mptcp_sock *msk); |
|
unsigned int mptcp_pm_get_subflows_max(struct mptcp_sock *msk); |
|
unsigned int mptcp_pm_get_local_addr_max(struct mptcp_sock *msk); |
|
|
|
static inline struct mptcp_ext *mptcp_get_ext(struct sk_buff *skb) |
|
{ |
|
return (struct mptcp_ext *)skb_ext_find(skb, SKB_EXT_MPTCP); |
|
} |
|
|
|
void mptcp_diag_subflow_init(struct tcp_ulp_ops *ops); |
|
|
|
static inline bool __mptcp_check_fallback(const struct mptcp_sock *msk) |
|
{ |
|
return test_bit(MPTCP_FALLBACK_DONE, &msk->flags); |
|
} |
|
|
|
static inline bool mptcp_check_fallback(const struct sock *sk) |
|
{ |
|
struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); |
|
struct mptcp_sock *msk = mptcp_sk(subflow->conn); |
|
|
|
return __mptcp_check_fallback(msk); |
|
} |
|
|
|
static inline void __mptcp_do_fallback(struct mptcp_sock *msk) |
|
{ |
|
if (test_bit(MPTCP_FALLBACK_DONE, &msk->flags)) { |
|
pr_debug("TCP fallback already done (msk=%p)", msk); |
|
return; |
|
} |
|
set_bit(MPTCP_FALLBACK_DONE, &msk->flags); |
|
} |
|
|
|
static inline void mptcp_do_fallback(struct sock *sk) |
|
{ |
|
struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); |
|
struct mptcp_sock *msk = mptcp_sk(subflow->conn); |
|
|
|
__mptcp_do_fallback(msk); |
|
} |
|
|
|
#define pr_fallback(a) pr_debug("%s:fallback to TCP (msk=%p)", __func__, a) |
|
|
|
static inline bool subflow_simultaneous_connect(struct sock *sk) |
|
{ |
|
struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); |
|
struct sock *parent = subflow->conn; |
|
|
|
return sk->sk_state == TCP_ESTABLISHED && |
|
!mptcp_sk(parent)->pm.server_side && |
|
!subflow->conn_finished; |
|
} |
|
|
|
#ifdef CONFIG_SYN_COOKIES |
|
void subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req, |
|
struct sk_buff *skb); |
|
bool mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req, |
|
struct sk_buff *skb); |
|
void __init mptcp_join_cookie_init(void); |
|
#else |
|
static inline void |
|
subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req, |
|
struct sk_buff *skb) {} |
|
static inline bool |
|
mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req, |
|
struct sk_buff *skb) |
|
{ |
|
return false; |
|
} |
|
|
|
static inline void mptcp_join_cookie_init(void) {} |
|
#endif |
|
|
|
#endif /* __MPTCP_PROTOCOL_H */
|
|
|