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539f6b9de3
Currently, upon the reception of an ADD_ADDR (and when the fullmesh flag is not used), the in-kernel PM will create new subflows using the local address the routing configuration will pick. It would be easier to pick local addresses from a selected list of endpoints, and use it only once, than relying on routing rules. Use case: both the client (C) and the server (S) have two addresses (a and b). The client establishes the connection between C(a) and S(a). Once established, the server announces its additional address S(b). Once received, the client connects to it using its second address C(b). Compared to a situation without the 'laminar' endpoint for C(b), the client didn't use this address C(b) to establish a subflow to the server's primary address S(a). So at the end, we have: C S C(a) --- S(a) C(b) --- S(b) In case of a 3rd address on each side (C(c) and S(c)), upon the reception of an ADD_ADDR with S(c), the client should not pick C(b) because it has already been used. C(c) should then be used. Note that this situation is currently possible if C doesn't add any endpoint, but configure the routing in order to pick C(b) for the route to S(b), and pick C(c) for the route to S(c). That doesn't sound very practical because it means knowing in advance the IP addresses that will be used and announced by the server. 'laminar', like the idea of laminar flows: the different subflows don't mix with each other on an endpoint, unlike the "turbulent" way traffic is mixed by 'fullmesh'. In the code, the new endpoint type is added. Similar to the other subflow types, an MPTCP_INFO counter is added. While at it, hole are now commented in struct mptcp_info, to remember next time that these holes can no longer be used. Closes: https://github.com/multipath-tcp/mptcp_net-next/issues/503 Reviewed-by: Mat Martineau <martineau@kernel.org> Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org> Link: https://patch.msgid.link/20250925-net-next-mptcp-c-flag-laminar-v1-15-ad126cc47c6b@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
141 lines
4.3 KiB
C
141 lines
4.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
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#ifndef _UAPI_MPTCP_H
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#define _UAPI_MPTCP_H
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#ifndef __KERNEL__
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#include <netinet/in.h> /* for sockaddr_in and sockaddr_in6 */
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#include <sys/socket.h> /* for struct sockaddr */
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#endif
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#include <linux/const.h>
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#include <linux/types.h>
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#include <linux/in.h> /* for sockaddr_in */
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#include <linux/in6.h> /* for sockaddr_in6 */
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#include <linux/socket.h> /* for sockaddr_storage and sa_family */
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#define MPTCP_SUBFLOW_FLAG_MCAP_REM _BITUL(0)
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#define MPTCP_SUBFLOW_FLAG_MCAP_LOC _BITUL(1)
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#define MPTCP_SUBFLOW_FLAG_JOIN_REM _BITUL(2)
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#define MPTCP_SUBFLOW_FLAG_JOIN_LOC _BITUL(3)
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#define MPTCP_SUBFLOW_FLAG_BKUP_REM _BITUL(4)
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#define MPTCP_SUBFLOW_FLAG_BKUP_LOC _BITUL(5)
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#define MPTCP_SUBFLOW_FLAG_FULLY_ESTABLISHED _BITUL(6)
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#define MPTCP_SUBFLOW_FLAG_CONNECTED _BITUL(7)
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#define MPTCP_SUBFLOW_FLAG_MAPVALID _BITUL(8)
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#define MPTCP_PM_CMD_GRP_NAME "mptcp_pm_cmds"
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#define MPTCP_PM_EV_GRP_NAME "mptcp_pm_events"
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#include <linux/mptcp_pm.h>
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#define MPTCP_INFO_FLAG_FALLBACK _BITUL(0)
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#define MPTCP_INFO_FLAG_REMOTE_KEY_RECEIVED _BITUL(1)
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#define MPTCP_PM_EV_FLAG_DENY_JOIN_ID0 _BITUL(0)
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#define MPTCP_PM_EV_FLAG_SERVER_SIDE _BITUL(1)
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#define MPTCP_PM_ADDR_FLAG_SIGNAL _BITUL(0)
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#define MPTCP_PM_ADDR_FLAG_SUBFLOW _BITUL(1)
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#define MPTCP_PM_ADDR_FLAG_BACKUP _BITUL(2)
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#define MPTCP_PM_ADDR_FLAG_FULLMESH _BITUL(3)
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#define MPTCP_PM_ADDR_FLAG_IMPLICIT _BITUL(4)
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#define MPTCP_PM_ADDR_FLAG_LAMINAR _BITUL(5)
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struct mptcp_info {
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__u8 mptcpi_subflows;
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#define mptcpi_extra_subflows mptcpi_subflows
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__u8 mptcpi_add_addr_signal;
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__u8 mptcpi_add_addr_accepted;
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__u8 mptcpi_subflows_max;
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#define mptcpi_limit_extra_subflows mptcpi_subflows_max
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__u8 mptcpi_add_addr_signal_max;
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#define mptcpi_endp_signal_max mptcpi_add_addr_signal_max
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__u8 mptcpi_add_addr_accepted_max;
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#define mptcpi_limit_add_addr_accepted mptcpi_add_addr_accepted_max
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/* 16-bit hole that can no longer be filled */
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__u32 mptcpi_flags;
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__u32 mptcpi_token;
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__u64 mptcpi_write_seq;
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__u64 mptcpi_snd_una;
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__u64 mptcpi_rcv_nxt;
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__u8 mptcpi_local_addr_used;
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__u8 mptcpi_local_addr_max;
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#define mptcpi_endp_subflow_max mptcpi_local_addr_max
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__u8 mptcpi_csum_enabled;
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/* 8-bit hole that can no longer be filled */
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__u32 mptcpi_retransmits;
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__u64 mptcpi_bytes_retrans;
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__u64 mptcpi_bytes_sent;
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__u64 mptcpi_bytes_received;
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__u64 mptcpi_bytes_acked;
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__u8 mptcpi_subflows_total;
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__u8 mptcpi_endp_laminar_max;
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__u8 reserved[2];
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__u32 mptcpi_last_data_sent;
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__u32 mptcpi_last_data_recv;
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__u32 mptcpi_last_ack_recv;
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};
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/* MPTCP Reset reason codes, rfc8684 */
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#define MPTCP_RST_EUNSPEC 0
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#define MPTCP_RST_EMPTCP 1
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#define MPTCP_RST_ERESOURCE 2
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#define MPTCP_RST_EPROHIBIT 3
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#define MPTCP_RST_EWQ2BIG 4
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#define MPTCP_RST_EBADPERF 5
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#define MPTCP_RST_EMIDDLEBOX 6
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struct mptcp_subflow_data {
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__u32 size_subflow_data; /* size of this structure in userspace */
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__u32 num_subflows; /* must be 0, set by kernel */
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__u32 size_kernel; /* must be 0, set by kernel */
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__u32 size_user; /* size of one element in data[] */
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} __attribute__((aligned(8)));
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struct mptcp_subflow_addrs {
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union {
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__kernel_sa_family_t sa_family;
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struct sockaddr sa_local;
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struct sockaddr_in sin_local;
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struct sockaddr_in6 sin6_local;
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struct __kernel_sockaddr_storage ss_local;
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};
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union {
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struct sockaddr sa_remote;
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struct sockaddr_in sin_remote;
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struct sockaddr_in6 sin6_remote;
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struct __kernel_sockaddr_storage ss_remote;
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};
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};
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struct mptcp_subflow_info {
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__u32 id;
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struct mptcp_subflow_addrs addrs;
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};
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struct mptcp_full_info {
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__u32 size_tcpinfo_kernel; /* must be 0, set by kernel */
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__u32 size_tcpinfo_user;
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__u32 size_sfinfo_kernel; /* must be 0, set by kernel */
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__u32 size_sfinfo_user;
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__u32 num_subflows; /* must be 0, set by kernel (real subflow count) */
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__u32 size_arrays_user; /* max subflows that userspace is interested in;
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* the buffers at subflow_info/tcp_info
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* are respectively at least:
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* size_arrays * size_sfinfo_user
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* size_arrays * size_tcpinfo_user
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* bytes wide
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*/
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__aligned_u64 subflow_info;
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__aligned_u64 tcp_info;
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struct mptcp_info mptcp_info;
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};
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/* MPTCP socket options */
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#define MPTCP_INFO 1
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#define MPTCP_TCPINFO 2
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#define MPTCP_SUBFLOW_ADDRS 3
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#define MPTCP_FULL_INFO 4
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#endif /* _UAPI_MPTCP_H */
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