| /* SPDX-License-Identifier: GPL-2.0 */ |
| /* Multipath TCP |
| * |
| * Copyright (c) 2017 - 2019, Intel Corporation. |
| */ |
| |
| #ifndef __MPTCP_PROTOCOL_H |
| #define __MPTCP_PROTOCOL_H |
| |
| #define MPTCP_SUPPORTED_VERSION 0 |
| |
| /* MPTCP option bits */ |
| #define OPTION_MPTCP_MPC_SYN BIT(0) |
| #define OPTION_MPTCP_MPC_SYNACK BIT(1) |
| #define OPTION_MPTCP_MPC_ACK BIT(2) |
| |
| /* MPTCP option subtypes */ |
| #define MPTCPOPT_MP_CAPABLE 0 |
| #define MPTCPOPT_MP_JOIN 1 |
| #define MPTCPOPT_DSS 2 |
| #define MPTCPOPT_ADD_ADDR 3 |
| #define MPTCPOPT_RM_ADDR 4 |
| #define MPTCPOPT_MP_PRIO 5 |
| #define MPTCPOPT_MP_FAIL 6 |
| #define MPTCPOPT_MP_FASTCLOSE 7 |
| |
| /* MPTCP suboption lengths */ |
| #define TCPOLEN_MPTCP_MPC_SYN 12 |
| #define TCPOLEN_MPTCP_MPC_SYNACK 12 |
| #define TCPOLEN_MPTCP_MPC_ACK 20 |
| |
| /* MPTCP MP_CAPABLE flags */ |
| #define MPTCP_VERSION_MASK (0x0F) |
| #define MPTCP_CAP_CHECKSUM_REQD BIT(7) |
| #define MPTCP_CAP_EXTENSIBILITY BIT(6) |
| #define MPTCP_CAP_HMAC_SHA1 BIT(0) |
| #define MPTCP_CAP_FLAG_MASK (0x3F) |
| |
| /* MPTCP connection sock */ |
| struct mptcp_sock { |
| /* inet_connection_sock must be the first member */ |
| struct inet_connection_sock sk; |
| u64 local_key; |
| u64 remote_key; |
| struct list_head conn_list; |
| struct socket *subflow; /* outgoing connect/listener/!mp_capable */ |
| }; |
| |
| #define mptcp_for_each_subflow(__msk, __subflow) \ |
| list_for_each_entry(__subflow, &((__msk)->conn_list), node) |
| |
| static inline struct mptcp_sock *mptcp_sk(const struct sock *sk) |
| { |
| return (struct mptcp_sock *)sk; |
| } |
| |
| struct mptcp_subflow_request_sock { |
| struct tcp_request_sock sk; |
| u8 mp_capable : 1, |
| mp_join : 1, |
| backup : 1; |
| u64 local_key; |
| u64 remote_key; |
| }; |
| |
| static inline struct mptcp_subflow_request_sock * |
| mptcp_subflow_rsk(const struct request_sock *rsk) |
| { |
| return (struct mptcp_subflow_request_sock *)rsk; |
| } |
| |
| /* MPTCP subflow context */ |
| struct mptcp_subflow_context { |
| struct list_head node;/* conn_list of subflows */ |
| u64 local_key; |
| u64 remote_key; |
| u32 request_mptcp : 1, /* send MP_CAPABLE */ |
| mp_capable : 1, /* remote is MPTCP capable */ |
| fourth_ack : 1, /* send initial DSS */ |
| conn_finished : 1; |
| struct sock *tcp_sock; /* tcp sk backpointer */ |
| struct sock *conn; /* parent mptcp_sock */ |
| const struct inet_connection_sock_af_ops *icsk_af_ops; |
| struct rcu_head rcu; |
| }; |
| |
| static inline struct mptcp_subflow_context * |
| mptcp_subflow_ctx(const struct sock *sk) |
| { |
| struct inet_connection_sock *icsk = inet_csk(sk); |
| |
| /* Use RCU on icsk_ulp_data only for sock diag code */ |
| return (__force struct mptcp_subflow_context *)icsk->icsk_ulp_data; |
| } |
| |
| static inline struct sock * |
| mptcp_subflow_tcp_sock(const struct mptcp_subflow_context *subflow) |
| { |
| return subflow->tcp_sock; |
| } |
| |
| void mptcp_subflow_init(void); |
| int mptcp_subflow_create_socket(struct sock *sk, struct socket **new_sock); |
| |
| extern const struct inet_connection_sock_af_ops ipv4_specific; |
| #if IS_ENABLED(CONFIG_MPTCP_IPV6) |
| extern const struct inet_connection_sock_af_ops ipv6_specific; |
| #endif |
| |
| void mptcp_get_options(const struct sk_buff *skb, |
| struct tcp_options_received *opt_rx); |
| |
| void mptcp_finish_connect(struct sock *sk); |
| |
| #endif /* __MPTCP_PROTOCOL_H */ |