Christopher Ferris | 2598113 | 2017-11-14 16:53:49 -0800 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */ |
Ben Cheng | 224b54f | 2013-10-15 18:26:18 -0700 | [diff] [blame] | 2 | /* |
| 3 | * INET An implementation of the TCP/IP protocol suite for the LINUX |
| 4 | * operating system. INET is implemented using the BSD Socket |
| 5 | * interface as the means of communication with the user level. |
| 6 | * |
| 7 | * Definitions for the TCP protocol. |
| 8 | * |
| 9 | * Version: @(#)tcp.h 1.0.2 04/28/93 |
| 10 | * |
| 11 | * Author: Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
| 12 | * |
| 13 | * This program is free software; you can redistribute it and/or |
| 14 | * modify it under the terms of the GNU General Public License |
| 15 | * as published by the Free Software Foundation; either version |
| 16 | * 2 of the License, or (at your option) any later version. |
| 17 | */ |
| 18 | #ifndef _UAPI_LINUX_TCP_H |
| 19 | #define _UAPI_LINUX_TCP_H |
| 20 | |
| 21 | #include <linux/types.h> |
| 22 | #include <asm/byteorder.h> |
| 23 | #include <linux/socket.h> |
| 24 | |
| 25 | struct tcphdr { |
| 26 | __be16 source; |
| 27 | __be16 dest; |
| 28 | __be32 seq; |
| 29 | __be32 ack_seq; |
| 30 | #if defined(__LITTLE_ENDIAN_BITFIELD) |
| 31 | __u16 res1:4, |
| 32 | doff:4, |
| 33 | fin:1, |
| 34 | syn:1, |
| 35 | rst:1, |
| 36 | psh:1, |
| 37 | ack:1, |
| 38 | urg:1, |
| 39 | ece:1, |
| 40 | cwr:1; |
| 41 | #elif defined(__BIG_ENDIAN_BITFIELD) |
| 42 | __u16 doff:4, |
| 43 | res1:4, |
| 44 | cwr:1, |
| 45 | ece:1, |
| 46 | urg:1, |
| 47 | ack:1, |
| 48 | psh:1, |
| 49 | rst:1, |
| 50 | syn:1, |
| 51 | fin:1; |
| 52 | #else |
| 53 | #error "Adjust your <asm/byteorder.h> defines" |
| 54 | #endif |
| 55 | __be16 window; |
| 56 | __sum16 check; |
| 57 | __be16 urg_ptr; |
| 58 | }; |
| 59 | |
| 60 | /* |
| 61 | * The union cast uses a gcc extension to avoid aliasing problems |
| 62 | * (union is compatible to any of its members) |
| 63 | * This means this part of the code is -fstrict-aliasing safe now. |
| 64 | */ |
| 65 | union tcp_word_hdr { |
| 66 | struct tcphdr hdr; |
| 67 | __be32 words[5]; |
| 68 | }; |
| 69 | |
| 70 | #define tcp_flag_word(tp) ( ((union tcp_word_hdr *)(tp))->words [3]) |
| 71 | |
| 72 | enum { |
| 73 | TCP_FLAG_CWR = __constant_cpu_to_be32(0x00800000), |
| 74 | TCP_FLAG_ECE = __constant_cpu_to_be32(0x00400000), |
| 75 | TCP_FLAG_URG = __constant_cpu_to_be32(0x00200000), |
| 76 | TCP_FLAG_ACK = __constant_cpu_to_be32(0x00100000), |
| 77 | TCP_FLAG_PSH = __constant_cpu_to_be32(0x00080000), |
| 78 | TCP_FLAG_RST = __constant_cpu_to_be32(0x00040000), |
| 79 | TCP_FLAG_SYN = __constant_cpu_to_be32(0x00020000), |
| 80 | TCP_FLAG_FIN = __constant_cpu_to_be32(0x00010000), |
| 81 | TCP_RESERVED_BITS = __constant_cpu_to_be32(0x0F000000), |
| 82 | TCP_DATA_OFFSET = __constant_cpu_to_be32(0xF0000000) |
| 83 | }; |
| 84 | |
| 85 | /* |
| 86 | * TCP general constants |
| 87 | */ |
| 88 | #define TCP_MSS_DEFAULT 536U /* IPv4 (RFC1122, RFC2581) */ |
| 89 | #define TCP_MSS_DESIRED 1220U /* IPv6 (tunneled), EDNS0 (RFC3226) */ |
| 90 | |
| 91 | /* TCP socket options */ |
| 92 | #define TCP_NODELAY 1 /* Turn off Nagle's algorithm. */ |
| 93 | #define TCP_MAXSEG 2 /* Limit MSS */ |
| 94 | #define TCP_CORK 3 /* Never send partially complete segments */ |
| 95 | #define TCP_KEEPIDLE 4 /* Start keeplives after this period */ |
| 96 | #define TCP_KEEPINTVL 5 /* Interval between keepalives */ |
| 97 | #define TCP_KEEPCNT 6 /* Number of keepalives before death */ |
| 98 | #define TCP_SYNCNT 7 /* Number of SYN retransmits */ |
| 99 | #define TCP_LINGER2 8 /* Life time of orphaned FIN-WAIT-2 state */ |
| 100 | #define TCP_DEFER_ACCEPT 9 /* Wake up listener only when data arrive */ |
| 101 | #define TCP_WINDOW_CLAMP 10 /* Bound advertised window */ |
| 102 | #define TCP_INFO 11 /* Information about this connection. */ |
| 103 | #define TCP_QUICKACK 12 /* Block/reenable quick acks */ |
| 104 | #define TCP_CONGESTION 13 /* Congestion control algorithm */ |
| 105 | #define TCP_MD5SIG 14 /* TCP MD5 Signature (RFC2385) */ |
| 106 | #define TCP_THIN_LINEAR_TIMEOUTS 16 /* Use linear timeouts for thin streams*/ |
| 107 | #define TCP_THIN_DUPACK 17 /* Fast retrans. after 1 dupack */ |
| 108 | #define TCP_USER_TIMEOUT 18 /* How long for loss retry before timeout */ |
| 109 | #define TCP_REPAIR 19 /* TCP sock is under repair right now */ |
| 110 | #define TCP_REPAIR_QUEUE 20 |
| 111 | #define TCP_QUEUE_SEQ 21 |
| 112 | #define TCP_REPAIR_OPTIONS 22 |
| 113 | #define TCP_FASTOPEN 23 /* Enable FastOpen on listeners */ |
| 114 | #define TCP_TIMESTAMP 24 |
Christopher Ferris | e084501 | 2014-07-09 14:58:51 -0700 | [diff] [blame] | 115 | #define TCP_NOTSENT_LOWAT 25 /* limit number of unsent bytes in write queue */ |
Christopher Ferris | 12e1f28 | 2016-02-04 12:35:07 -0800 | [diff] [blame] | 116 | #define TCP_CC_INFO 26 /* Get Congestion Control (optional) info */ |
| 117 | #define TCP_SAVE_SYN 27 /* Record SYN headers for new connections */ |
| 118 | #define TCP_SAVED_SYN 28 /* Get SYN headers recorded for connection */ |
Christopher Ferris | 6e3550f | 2016-12-12 14:51:18 -0800 | [diff] [blame] | 119 | #define TCP_REPAIR_WINDOW 29 /* Get/set window parameters */ |
Christopher Ferris | 0543f74 | 2017-07-26 13:09:46 -0700 | [diff] [blame] | 120 | #define TCP_FASTOPEN_CONNECT 30 /* Attempt FastOpen with connect */ |
Christopher Ferris | 2598113 | 2017-11-14 16:53:49 -0800 | [diff] [blame] | 121 | #define TCP_ULP 31 /* Attach a ULP to a TCP connection */ |
| 122 | #define TCP_MD5SIG_EXT 32 /* TCP MD5 Signature with extensions */ |
Ben Cheng | 224b54f | 2013-10-15 18:26:18 -0700 | [diff] [blame] | 123 | |
| 124 | struct tcp_repair_opt { |
| 125 | __u32 opt_code; |
| 126 | __u32 opt_val; |
| 127 | }; |
| 128 | |
Christopher Ferris | 6e3550f | 2016-12-12 14:51:18 -0800 | [diff] [blame] | 129 | struct tcp_repair_window { |
| 130 | __u32 snd_wl1; |
| 131 | __u32 snd_wnd; |
| 132 | __u32 max_window; |
| 133 | |
| 134 | __u32 rcv_wnd; |
| 135 | __u32 rcv_wup; |
| 136 | }; |
| 137 | |
Ben Cheng | 224b54f | 2013-10-15 18:26:18 -0700 | [diff] [blame] | 138 | enum { |
| 139 | TCP_NO_QUEUE, |
| 140 | TCP_RECV_QUEUE, |
| 141 | TCP_SEND_QUEUE, |
| 142 | TCP_QUEUES_NR, |
| 143 | }; |
| 144 | |
| 145 | /* for TCP_INFO socket option */ |
| 146 | #define TCPI_OPT_TIMESTAMPS 1 |
| 147 | #define TCPI_OPT_SACK 2 |
| 148 | #define TCPI_OPT_WSCALE 4 |
| 149 | #define TCPI_OPT_ECN 8 /* ECN was negociated at TCP session init */ |
| 150 | #define TCPI_OPT_ECN_SEEN 16 /* we received at least one packet with ECT */ |
| 151 | #define TCPI_OPT_SYN_DATA 32 /* SYN-ACK acked data in SYN sent or rcvd */ |
| 152 | |
| 153 | enum tcp_ca_state { |
| 154 | TCP_CA_Open = 0, |
| 155 | #define TCPF_CA_Open (1<<TCP_CA_Open) |
| 156 | TCP_CA_Disorder = 1, |
| 157 | #define TCPF_CA_Disorder (1<<TCP_CA_Disorder) |
| 158 | TCP_CA_CWR = 2, |
| 159 | #define TCPF_CA_CWR (1<<TCP_CA_CWR) |
| 160 | TCP_CA_Recovery = 3, |
| 161 | #define TCPF_CA_Recovery (1<<TCP_CA_Recovery) |
| 162 | TCP_CA_Loss = 4 |
| 163 | #define TCPF_CA_Loss (1<<TCP_CA_Loss) |
| 164 | }; |
| 165 | |
| 166 | struct tcp_info { |
| 167 | __u8 tcpi_state; |
| 168 | __u8 tcpi_ca_state; |
| 169 | __u8 tcpi_retransmits; |
| 170 | __u8 tcpi_probes; |
| 171 | __u8 tcpi_backoff; |
| 172 | __u8 tcpi_options; |
| 173 | __u8 tcpi_snd_wscale : 4, tcpi_rcv_wscale : 4; |
Christopher Ferris | 3318540 | 2017-01-13 13:28:52 -0800 | [diff] [blame] | 174 | __u8 tcpi_delivery_rate_app_limited:1; |
Ben Cheng | 224b54f | 2013-10-15 18:26:18 -0700 | [diff] [blame] | 175 | |
| 176 | __u32 tcpi_rto; |
| 177 | __u32 tcpi_ato; |
| 178 | __u32 tcpi_snd_mss; |
| 179 | __u32 tcpi_rcv_mss; |
| 180 | |
| 181 | __u32 tcpi_unacked; |
| 182 | __u32 tcpi_sacked; |
| 183 | __u32 tcpi_lost; |
| 184 | __u32 tcpi_retrans; |
| 185 | __u32 tcpi_fackets; |
| 186 | |
| 187 | /* Times. */ |
| 188 | __u32 tcpi_last_data_sent; |
| 189 | __u32 tcpi_last_ack_sent; /* Not remembered, sorry. */ |
| 190 | __u32 tcpi_last_data_recv; |
| 191 | __u32 tcpi_last_ack_recv; |
| 192 | |
| 193 | /* Metrics. */ |
| 194 | __u32 tcpi_pmtu; |
| 195 | __u32 tcpi_rcv_ssthresh; |
| 196 | __u32 tcpi_rtt; |
| 197 | __u32 tcpi_rttvar; |
| 198 | __u32 tcpi_snd_ssthresh; |
| 199 | __u32 tcpi_snd_cwnd; |
| 200 | __u32 tcpi_advmss; |
| 201 | __u32 tcpi_reordering; |
| 202 | |
| 203 | __u32 tcpi_rcv_rtt; |
| 204 | __u32 tcpi_rcv_space; |
| 205 | |
| 206 | __u32 tcpi_total_retrans; |
Christopher Ferris | 3147524 | 2014-09-02 17:43:51 -0700 | [diff] [blame] | 207 | |
| 208 | __u64 tcpi_pacing_rate; |
| 209 | __u64 tcpi_max_pacing_rate; |
Christopher Ferris | 12e1f28 | 2016-02-04 12:35:07 -0800 | [diff] [blame] | 210 | __u64 tcpi_bytes_acked; /* RFC4898 tcpEStatsAppHCThruOctetsAcked */ |
| 211 | __u64 tcpi_bytes_received; /* RFC4898 tcpEStatsAppHCThruOctetsReceived */ |
| 212 | __u32 tcpi_segs_out; /* RFC4898 tcpEStatsPerfSegsOut */ |
| 213 | __u32 tcpi_segs_in; /* RFC4898 tcpEStatsPerfSegsIn */ |
Christopher Ferris | ccfaccd | 2016-08-24 12:11:31 -0700 | [diff] [blame] | 214 | |
| 215 | __u32 tcpi_notsent_bytes; |
| 216 | __u32 tcpi_min_rtt; |
| 217 | __u32 tcpi_data_segs_in; /* RFC4898 tcpEStatsDataSegsIn */ |
| 218 | __u32 tcpi_data_segs_out; /* RFC4898 tcpEStatsDataSegsOut */ |
Christopher Ferris | 3318540 | 2017-01-13 13:28:52 -0800 | [diff] [blame] | 219 | |
| 220 | __u64 tcpi_delivery_rate; |
Christopher Ferris | 2fd4b3c | 2017-02-21 12:32:08 -0800 | [diff] [blame] | 221 | |
| 222 | __u64 tcpi_busy_time; /* Time (usec) busy sending data */ |
| 223 | __u64 tcpi_rwnd_limited; /* Time (usec) limited by receive window */ |
| 224 | __u64 tcpi_sndbuf_limited; /* Time (usec) limited by send buffer */ |
| 225 | }; |
| 226 | |
| 227 | /* netlink attributes types for SCM_TIMESTAMPING_OPT_STATS */ |
| 228 | enum { |
| 229 | TCP_NLA_PAD, |
| 230 | TCP_NLA_BUSY, /* Time (usec) busy sending data */ |
| 231 | TCP_NLA_RWND_LIMITED, /* Time (usec) limited by receive window */ |
| 232 | TCP_NLA_SNDBUF_LIMITED, /* Time (usec) limited by send buffer */ |
Christopher Ferris | 0543f74 | 2017-07-26 13:09:46 -0700 | [diff] [blame] | 233 | TCP_NLA_DATA_SEGS_OUT, /* Data pkts sent including retransmission */ |
| 234 | TCP_NLA_TOTAL_RETRANS, /* Data pkts retransmitted */ |
Christopher Ferris | 2598113 | 2017-11-14 16:53:49 -0800 | [diff] [blame] | 235 | TCP_NLA_PACING_RATE, /* Pacing rate in bytes per second */ |
| 236 | TCP_NLA_DELIVERY_RATE, /* Delivery rate in bytes per second */ |
| 237 | TCP_NLA_SND_CWND, /* Sending congestion window */ |
| 238 | TCP_NLA_REORDERING, /* Reordering metric */ |
| 239 | TCP_NLA_MIN_RTT, /* minimum RTT */ |
| 240 | TCP_NLA_RECUR_RETRANS, /* Recurring retransmits for the current pkt */ |
| 241 | TCP_NLA_DELIVERY_RATE_APP_LMT, /* delivery rate application limited ? */ |
| 242 | |
Ben Cheng | 224b54f | 2013-10-15 18:26:18 -0700 | [diff] [blame] | 243 | }; |
| 244 | |
| 245 | /* for TCP_MD5SIG socket option */ |
| 246 | #define TCP_MD5SIG_MAXKEYLEN 80 |
| 247 | |
Christopher Ferris | 2598113 | 2017-11-14 16:53:49 -0800 | [diff] [blame] | 248 | /* tcp_md5sig extension flags for TCP_MD5SIG_EXT */ |
| 249 | #define TCP_MD5SIG_FLAG_PREFIX 1 /* address prefix length */ |
| 250 | |
Ben Cheng | 224b54f | 2013-10-15 18:26:18 -0700 | [diff] [blame] | 251 | struct tcp_md5sig { |
| 252 | struct __kernel_sockaddr_storage tcpm_addr; /* address associated */ |
Christopher Ferris | 2598113 | 2017-11-14 16:53:49 -0800 | [diff] [blame] | 253 | __u8 tcpm_flags; /* extension flags */ |
| 254 | __u8 tcpm_prefixlen; /* address prefix */ |
Ben Cheng | 224b54f | 2013-10-15 18:26:18 -0700 | [diff] [blame] | 255 | __u16 tcpm_keylen; /* key length */ |
Christopher Ferris | 2598113 | 2017-11-14 16:53:49 -0800 | [diff] [blame] | 256 | __u32 __tcpm_pad; /* zero */ |
Ben Cheng | 224b54f | 2013-10-15 18:26:18 -0700 | [diff] [blame] | 257 | __u8 tcpm_key[TCP_MD5SIG_MAXKEYLEN]; /* key (binary) */ |
| 258 | }; |
| 259 | |
Christopher Ferris | 2598113 | 2017-11-14 16:53:49 -0800 | [diff] [blame] | 260 | /* INET_DIAG_MD5SIG */ |
| 261 | struct tcp_diag_md5sig { |
| 262 | __u8 tcpm_family; |
| 263 | __u8 tcpm_prefixlen; |
| 264 | __u16 tcpm_keylen; |
| 265 | __be32 tcpm_addr[4]; |
| 266 | __u8 tcpm_key[TCP_MD5SIG_MAXKEYLEN]; |
| 267 | }; |
| 268 | |
Ben Cheng | 224b54f | 2013-10-15 18:26:18 -0700 | [diff] [blame] | 269 | #endif /* _UAPI_LINUX_TCP_H */ |