2303f994b3
Use ULP to associate a subflow_context structure with each TCP subflow socket. Creating these sockets requires new bind and connect functions to make sure ULP is set up immediately when the subflow sockets are created. Co-developed-by: Florian Westphal <fw@strlen.de> Signed-off-by: Florian Westphal <fw@strlen.de> Co-developed-by: Matthieu Baerts <matthieu.baerts@tessares.net> Signed-off-by: Matthieu Baerts <matthieu.baerts@tessares.net> Co-developed-by: Davide Caratti <dcaratti@redhat.com> Signed-off-by: Davide Caratti <dcaratti@redhat.com> Co-developed-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: Peter Krystad <peter.krystad@linux.intel.com> Signed-off-by: Christoph Paasch <cpaasch@apple.com> Signed-off-by: David S. Miller <davem@davemloft.net>
78 lines
2.0 KiB
C
78 lines
2.0 KiB
C
/* 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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#define MPTCP_SUPPORTED_VERSION 0
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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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/* 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 12
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#define TCPOLEN_MPTCP_MPC_SYNACK 12
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#define TCPOLEN_MPTCP_MPC_ACK 20
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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_SHA1 BIT(0)
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#define MPTCP_CAP_FLAG_MASK (0x3F)
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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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struct socket *subflow; /* outgoing connect/listener/!mp_capable */
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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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/* MPTCP subflow context */
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struct mptcp_subflow_context {
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u32 request_mptcp : 1; /* send MP_CAPABLE */
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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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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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void mptcp_subflow_init(void);
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int mptcp_subflow_create_socket(struct sock *sk, struct socket **new_sock);
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#endif /* __MPTCP_PROTOCOL_H */
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