1 /* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
2 #ifndef _UAPI_MPTCP_H
3 #define _UAPI_MPTCP_H
4
5 #ifndef __KERNEL__
6 #include <netinet/in.h> /* for sockaddr_in and sockaddr_in6 */
7 #include <sys/socket.h> /* for struct sockaddr */
8 #endif
9
10 #include <linux/const.h>
11 #include <linux/types.h>
12 #include <linux/in.h> /* for sockaddr_in */
13 #include <linux/in6.h> /* for sockaddr_in6 */
14 #include <linux/socket.h> /* for sockaddr_storage and sa_family */
15
16 #define MPTCP_SUBFLOW_FLAG_MCAP_REM _BITUL(0)
17 #define MPTCP_SUBFLOW_FLAG_MCAP_LOC _BITUL(1)
18 #define MPTCP_SUBFLOW_FLAG_JOIN_REM _BITUL(2)
19 #define MPTCP_SUBFLOW_FLAG_JOIN_LOC _BITUL(3)
20 #define MPTCP_SUBFLOW_FLAG_BKUP_REM _BITUL(4)
21 #define MPTCP_SUBFLOW_FLAG_BKUP_LOC _BITUL(5)
22 #define MPTCP_SUBFLOW_FLAG_FULLY_ESTABLISHED _BITUL(6)
23 #define MPTCP_SUBFLOW_FLAG_CONNECTED _BITUL(7)
24 #define MPTCP_SUBFLOW_FLAG_MAPVALID _BITUL(8)
25
26 #define MPTCP_PM_CMD_GRP_NAME "mptcp_pm_cmds"
27 #define MPTCP_PM_EV_GRP_NAME "mptcp_pm_events"
28
29 #include <linux/mptcp_pm.h>
30
31 #define MPTCP_INFO_FLAG_FALLBACK _BITUL(0)
32 #define MPTCP_INFO_FLAG_REMOTE_KEY_RECEIVED _BITUL(1)
33
34 #define MPTCP_PM_ADDR_FLAG_SIGNAL (1 << 0)
35 #define MPTCP_PM_ADDR_FLAG_SUBFLOW (1 << 1)
36 #define MPTCP_PM_ADDR_FLAG_BACKUP (1 << 2)
37 #define MPTCP_PM_ADDR_FLAG_FULLMESH (1 << 3)
38 #define MPTCP_PM_ADDR_FLAG_IMPLICIT (1 << 4)
39
40 struct mptcp_info {
41 __u8 mptcpi_subflows;
42 __u8 mptcpi_add_addr_signal;
43 __u8 mptcpi_add_addr_accepted;
44 __u8 mptcpi_subflows_max;
45 __u8 mptcpi_add_addr_signal_max;
46 __u8 mptcpi_add_addr_accepted_max;
47 __u32 mptcpi_flags;
48 __u32 mptcpi_token;
49 __u64 mptcpi_write_seq;
50 __u64 mptcpi_snd_una;
51 __u64 mptcpi_rcv_nxt;
52 __u8 mptcpi_local_addr_used;
53 __u8 mptcpi_local_addr_max;
54 __u8 mptcpi_csum_enabled;
55 __u32 mptcpi_retransmits;
56 __u64 mptcpi_bytes_retrans;
57 __u64 mptcpi_bytes_sent;
58 __u64 mptcpi_bytes_received;
59 __u64 mptcpi_bytes_acked;
60 __u8 mptcpi_subflows_total;
61 __u8 reserved[3];
62 __u32 mptcpi_last_data_sent;
63 __u32 mptcpi_last_data_recv;
64 __u32 mptcpi_last_ack_recv;
65 };
66
67 /* MPTCP Reset reason codes, rfc8684 */
68 #define MPTCP_RST_EUNSPEC 0
69 #define MPTCP_RST_EMPTCP 1
70 #define MPTCP_RST_ERESOURCE 2
71 #define MPTCP_RST_EPROHIBIT 3
72 #define MPTCP_RST_EWQ2BIG 4
73 #define MPTCP_RST_EBADPERF 5
74 #define MPTCP_RST_EMIDDLEBOX 6
75
76 struct mptcp_subflow_data {
77 __u32 size_subflow_data; /* size of this structure in userspace */
78 __u32 num_subflows; /* must be 0, set by kernel */
79 __u32 size_kernel; /* must be 0, set by kernel */
80 __u32 size_user; /* size of one element in data[] */
81 } __attribute__((aligned(8)));
82
83 struct mptcp_subflow_addrs {
84 union {
85 __kernel_sa_family_t sa_family;
86 struct sockaddr sa_local;
87 struct sockaddr_in sin_local;
88 struct sockaddr_in6 sin6_local;
89 struct __kernel_sockaddr_storage ss_local;
90 };
91 union {
92 struct sockaddr sa_remote;
93 struct sockaddr_in sin_remote;
94 struct sockaddr_in6 sin6_remote;
95 struct __kernel_sockaddr_storage ss_remote;
96 };
97 };
98
99 struct mptcp_subflow_info {
100 __u32 id;
101 struct mptcp_subflow_addrs addrs;
102 };
103
104 struct mptcp_full_info {
105 __u32 size_tcpinfo_kernel; /* must be 0, set by kernel */
106 __u32 size_tcpinfo_user;
107 __u32 size_sfinfo_kernel; /* must be 0, set by kernel */
108 __u32 size_sfinfo_user;
109 __u32 num_subflows; /* must be 0, set by kernel (real subflow count) */
110 __u32 size_arrays_user; /* max subflows that userspace is interested in;
111 * the buffers at subflow_info/tcp_info
112 * are respectively at least:
113 * size_arrays * size_sfinfo_user
114 * size_arrays * size_tcpinfo_user
115 * bytes wide
116 */
117 __aligned_u64 subflow_info;
118 __aligned_u64 tcp_info;
119 struct mptcp_info mptcp_info;
120 };
121
122 /* MPTCP socket options */
123 #define MPTCP_INFO 1
124 #define MPTCP_TCPINFO 2
125 #define MPTCP_SUBFLOW_ADDRS 3
126 #define MPTCP_FULL_INFO 4
127
128 #endif /* _UAPI_MPTCP_H */
129
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