Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * INET An implementation of the TCP/IP protocol suite for the LINUX |
| 3 | * operating system. INET is implemented using the BSD Socket |
| 4 | * interface as the means of communication with the user level. |
| 5 | * |
| 6 | * Definitions for the TCP protocol. |
| 7 | * |
| 8 | * Version: @(#)tcp.h 1.0.2 04/28/93 |
| 9 | * |
| 10 | * Author: Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
| 11 | * |
| 12 | * This program is free software; you can redistribute it and/or |
| 13 | * modify it under the terms of the GNU General Public License |
| 14 | * as published by the Free Software Foundation; either version |
| 15 | * 2 of the License, or (at your option) any later version. |
| 16 | */ |
| 17 | #ifndef _LINUX_TCP_H |
| 18 | #define _LINUX_TCP_H |
| 19 | |
| 20 | #include <linux/types.h> |
| 21 | #include <asm/byteorder.h> |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 22 | #include <linux/socket.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | |
| 24 | struct tcphdr { |
Al Viro | 46a9732 | 2006-09-27 18:31:51 -0700 | [diff] [blame] | 25 | __be16 source; |
| 26 | __be16 dest; |
| 27 | __be32 seq; |
| 28 | __be32 ack_seq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | #if defined(__LITTLE_ENDIAN_BITFIELD) |
| 30 | __u16 res1:4, |
| 31 | doff:4, |
| 32 | fin:1, |
| 33 | syn:1, |
| 34 | rst:1, |
| 35 | psh:1, |
| 36 | ack:1, |
| 37 | urg:1, |
| 38 | ece:1, |
| 39 | cwr:1; |
| 40 | #elif defined(__BIG_ENDIAN_BITFIELD) |
| 41 | __u16 doff:4, |
| 42 | res1:4, |
| 43 | cwr:1, |
| 44 | ece:1, |
| 45 | urg:1, |
| 46 | ack:1, |
| 47 | psh:1, |
| 48 | rst:1, |
| 49 | syn:1, |
| 50 | fin:1; |
| 51 | #else |
| 52 | #error "Adjust your <asm/byteorder.h> defines" |
| 53 | #endif |
Al Viro | 46a9732 | 2006-09-27 18:31:51 -0700 | [diff] [blame] | 54 | __be16 window; |
Al Viro | 9981a0e | 2006-11-14 21:24:30 -0800 | [diff] [blame] | 55 | __sum16 check; |
Al Viro | 46a9732 | 2006-09-27 18:31:51 -0700 | [diff] [blame] | 56 | __be16 urg_ptr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | }; |
| 58 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | /* |
| 60 | * The union cast uses a gcc extension to avoid aliasing problems |
| 61 | * (union is compatible to any of its members) |
| 62 | * This means this part of the code is -fstrict-aliasing safe now. |
| 63 | */ |
| 64 | union tcp_word_hdr { |
| 65 | struct tcphdr hdr; |
Al Viro | 46a9732 | 2006-09-27 18:31:51 -0700 | [diff] [blame] | 66 | __be32 words[5]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | }; |
| 68 | |
| 69 | #define tcp_flag_word(tp) ( ((union tcp_word_hdr *)(tp))->words [3]) |
| 70 | |
| 71 | enum { |
| 72 | TCP_FLAG_CWR = __constant_htonl(0x00800000), |
| 73 | TCP_FLAG_ECE = __constant_htonl(0x00400000), |
| 74 | TCP_FLAG_URG = __constant_htonl(0x00200000), |
| 75 | TCP_FLAG_ACK = __constant_htonl(0x00100000), |
| 76 | TCP_FLAG_PSH = __constant_htonl(0x00080000), |
| 77 | TCP_FLAG_RST = __constant_htonl(0x00040000), |
| 78 | TCP_FLAG_SYN = __constant_htonl(0x00020000), |
| 79 | TCP_FLAG_FIN = __constant_htonl(0x00010000), |
| 80 | TCP_RESERVED_BITS = __constant_htonl(0x0F000000), |
| 81 | TCP_DATA_OFFSET = __constant_htonl(0xF0000000) |
| 82 | }; |
| 83 | |
| 84 | /* TCP socket options */ |
| 85 | #define TCP_NODELAY 1 /* Turn off Nagle's algorithm. */ |
| 86 | #define TCP_MAXSEG 2 /* Limit MSS */ |
| 87 | #define TCP_CORK 3 /* Never send partially complete segments */ |
| 88 | #define TCP_KEEPIDLE 4 /* Start keeplives after this period */ |
| 89 | #define TCP_KEEPINTVL 5 /* Interval between keepalives */ |
| 90 | #define TCP_KEEPCNT 6 /* Number of keepalives before death */ |
| 91 | #define TCP_SYNCNT 7 /* Number of SYN retransmits */ |
| 92 | #define TCP_LINGER2 8 /* Life time of orphaned FIN-WAIT-2 state */ |
| 93 | #define TCP_DEFER_ACCEPT 9 /* Wake up listener only when data arrive */ |
| 94 | #define TCP_WINDOW_CLAMP 10 /* Bound advertised window */ |
| 95 | #define TCP_INFO 11 /* Information about this connection. */ |
| 96 | #define TCP_QUICKACK 12 /* Block/reenable quick acks */ |
Stephen Hemminger | 5f8ef48 | 2005-06-23 20:37:36 -0700 | [diff] [blame] | 97 | #define TCP_CONGESTION 13 /* Congestion control algorithm */ |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 98 | #define TCP_MD5SIG 14 /* TCP MD5 Signature (RFC2385) */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | |
| 100 | #define TCPI_OPT_TIMESTAMPS 1 |
| 101 | #define TCPI_OPT_SACK 2 |
| 102 | #define TCPI_OPT_WSCALE 4 |
| 103 | #define TCPI_OPT_ECN 8 |
| 104 | |
| 105 | enum tcp_ca_state |
| 106 | { |
| 107 | TCP_CA_Open = 0, |
| 108 | #define TCPF_CA_Open (1<<TCP_CA_Open) |
| 109 | TCP_CA_Disorder = 1, |
| 110 | #define TCPF_CA_Disorder (1<<TCP_CA_Disorder) |
| 111 | TCP_CA_CWR = 2, |
| 112 | #define TCPF_CA_CWR (1<<TCP_CA_CWR) |
| 113 | TCP_CA_Recovery = 3, |
| 114 | #define TCPF_CA_Recovery (1<<TCP_CA_Recovery) |
| 115 | TCP_CA_Loss = 4 |
| 116 | #define TCPF_CA_Loss (1<<TCP_CA_Loss) |
| 117 | }; |
| 118 | |
| 119 | struct tcp_info |
| 120 | { |
| 121 | __u8 tcpi_state; |
| 122 | __u8 tcpi_ca_state; |
| 123 | __u8 tcpi_retransmits; |
| 124 | __u8 tcpi_probes; |
| 125 | __u8 tcpi_backoff; |
| 126 | __u8 tcpi_options; |
| 127 | __u8 tcpi_snd_wscale : 4, tcpi_rcv_wscale : 4; |
| 128 | |
| 129 | __u32 tcpi_rto; |
| 130 | __u32 tcpi_ato; |
| 131 | __u32 tcpi_snd_mss; |
| 132 | __u32 tcpi_rcv_mss; |
| 133 | |
| 134 | __u32 tcpi_unacked; |
| 135 | __u32 tcpi_sacked; |
| 136 | __u32 tcpi_lost; |
| 137 | __u32 tcpi_retrans; |
| 138 | __u32 tcpi_fackets; |
| 139 | |
| 140 | /* Times. */ |
| 141 | __u32 tcpi_last_data_sent; |
| 142 | __u32 tcpi_last_ack_sent; /* Not remembered, sorry. */ |
| 143 | __u32 tcpi_last_data_recv; |
| 144 | __u32 tcpi_last_ack_recv; |
| 145 | |
| 146 | /* Metrics. */ |
| 147 | __u32 tcpi_pmtu; |
| 148 | __u32 tcpi_rcv_ssthresh; |
| 149 | __u32 tcpi_rtt; |
| 150 | __u32 tcpi_rttvar; |
| 151 | __u32 tcpi_snd_ssthresh; |
| 152 | __u32 tcpi_snd_cwnd; |
| 153 | __u32 tcpi_advmss; |
| 154 | __u32 tcpi_reordering; |
| 155 | |
| 156 | __u32 tcpi_rcv_rtt; |
| 157 | __u32 tcpi_rcv_space; |
| 158 | |
| 159 | __u32 tcpi_total_retrans; |
| 160 | }; |
| 161 | |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 162 | /* for TCP_MD5SIG socket option */ |
| 163 | #define TCP_MD5SIG_MAXKEYLEN 80 |
| 164 | |
| 165 | struct tcp_md5sig { |
| 166 | struct __kernel_sockaddr_storage tcpm_addr; /* address associated */ |
| 167 | __u16 __tcpm_pad1; /* zero */ |
| 168 | __u16 tcpm_keylen; /* key length */ |
| 169 | __u32 __tcpm_pad2; /* zero */ |
| 170 | __u8 tcpm_key[TCP_MD5SIG_MAXKEYLEN]; /* key (binary) */ |
| 171 | }; |
| 172 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | #ifdef __KERNEL__ |
| 174 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | #include <linux/skbuff.h> |
David Woodhouse | c8a553ad | 2006-06-22 14:28:09 -0700 | [diff] [blame] | 176 | #include <linux/dmaengine.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | #include <net/sock.h> |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 178 | #include <net/inet_connection_sock.h> |
Arnaldo Carvalho de Melo | 8feaf0c | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 179 | #include <net/inet_timewait_sock.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 181 | static inline struct tcphdr *tcp_hdr(const struct sk_buff *skb) |
| 182 | { |
Arnaldo Carvalho de Melo | 9c70220 | 2007-04-25 18:04:18 -0700 | [diff] [blame] | 183 | return (struct tcphdr *)skb_transport_header(skb); |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 184 | } |
| 185 | |
Arnaldo Carvalho de Melo | ab6a5bb | 2007-03-18 17:43:48 -0700 | [diff] [blame] | 186 | static inline unsigned int tcp_hdrlen(const struct sk_buff *skb) |
| 187 | { |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 188 | return tcp_hdr(skb)->doff * 4; |
Arnaldo Carvalho de Melo | ab6a5bb | 2007-03-18 17:43:48 -0700 | [diff] [blame] | 189 | } |
| 190 | |
| 191 | static inline unsigned int tcp_optlen(const struct sk_buff *skb) |
| 192 | { |
Arnaldo Carvalho de Melo | aa8223c | 2007-04-10 21:04:22 -0700 | [diff] [blame] | 193 | return (tcp_hdr(skb)->doff - 5) * 4; |
Arnaldo Carvalho de Melo | ab6a5bb | 2007-03-18 17:43:48 -0700 | [diff] [blame] | 194 | } |
| 195 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | /* This defines a selective acknowledgement block. */ |
Al Viro | 269bd27 | 2006-09-27 18:32:28 -0700 | [diff] [blame] | 197 | struct tcp_sack_block_wire { |
| 198 | __be32 start_seq; |
| 199 | __be32 end_seq; |
| 200 | }; |
| 201 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | struct tcp_sack_block { |
Arnaldo Carvalho de Melo | 3a137d2 | 2006-11-28 01:12:38 -0200 | [diff] [blame] | 203 | u32 start_seq; |
| 204 | u32 end_seq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | }; |
| 206 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | struct tcp_options_received { |
| 208 | /* PAWS/RTTM data */ |
| 209 | long ts_recent_stamp;/* Time we stored ts_recent (for aging) */ |
Arnaldo Carvalho de Melo | 3a137d2 | 2006-11-28 01:12:38 -0200 | [diff] [blame] | 210 | u32 ts_recent; /* Time stamp to echo next */ |
| 211 | u32 rcv_tsval; /* Time stamp value */ |
| 212 | u32 rcv_tsecr; /* Time stamp echo reply */ |
| 213 | u16 saw_tstamp : 1, /* Saw TIMESTAMP on last packet */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | tstamp_ok : 1, /* TIMESTAMP seen on SYN packet */ |
| 215 | dsack : 1, /* D-SACK is scheduled */ |
| 216 | wscale_ok : 1, /* Wscale seen on SYN packet */ |
| 217 | sack_ok : 4, /* SACK seen on SYN packet */ |
| 218 | snd_wscale : 4, /* Window scaling received from sender */ |
| 219 | rcv_wscale : 4; /* Window scaling to send to receiver */ |
| 220 | /* SACKs data */ |
Arnaldo Carvalho de Melo | 3a137d2 | 2006-11-28 01:12:38 -0200 | [diff] [blame] | 221 | u8 eff_sacks; /* Size of SACK array to send with next packet */ |
| 222 | u8 num_sacks; /* Number of SACK blocks */ |
| 223 | u16 user_mss; /* mss requested by user in ioctl */ |
| 224 | u16 mss_clamp; /* Maximal mss, negotiated at connection setup */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | }; |
| 226 | |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 227 | struct tcp_request_sock { |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 228 | struct inet_request_sock req; |
| 229 | #ifdef CONFIG_TCP_MD5SIG |
| 230 | /* Only used by TCP MD5 Signature so far. */ |
| 231 | struct tcp_request_sock_ops *af_specific; |
| 232 | #endif |
Arnaldo Carvalho de Melo | 3a137d2 | 2006-11-28 01:12:38 -0200 | [diff] [blame] | 233 | u32 rcv_isn; |
| 234 | u32 snt_isn; |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 235 | }; |
| 236 | |
Arnaldo Carvalho de Melo | 60236fd | 2005-06-18 22:47:21 -0700 | [diff] [blame] | 237 | static inline struct tcp_request_sock *tcp_rsk(const struct request_sock *req) |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 238 | { |
| 239 | return (struct tcp_request_sock *)req; |
| 240 | } |
| 241 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 242 | struct tcp_sock { |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 243 | /* inet_connection_sock has to be the first member of tcp_sock */ |
| 244 | struct inet_connection_sock inet_conn; |
Arnaldo Carvalho de Melo | 2ff52f2 | 2006-11-28 00:48:32 -0200 | [diff] [blame] | 245 | u16 tcp_header_len; /* Bytes of tcp header to send */ |
| 246 | u16 xmit_size_goal; /* Goal for segmenting output packets */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | |
| 248 | /* |
| 249 | * Header prediction flags |
| 250 | * 0x5?10 << 16 + snd_wnd in net byte order |
| 251 | */ |
Al Viro | dddc93c | 2006-09-27 18:32:46 -0700 | [diff] [blame] | 252 | __be32 pred_flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | |
| 254 | /* |
| 255 | * RFC793 variables by their proper names. This means you can |
| 256 | * read the code and the spec side by side (and laugh ...) |
| 257 | * See RFC793 and RFC1122. The RFC writes these in capitals. |
| 258 | */ |
Arnaldo Carvalho de Melo | 3a137d2 | 2006-11-28 01:12:38 -0200 | [diff] [blame] | 259 | u32 rcv_nxt; /* What we want to receive next */ |
Eric Dumazet | 54287cc | 2007-02-22 03:20:44 -0800 | [diff] [blame] | 260 | u32 copied_seq; /* Head of yet unread data */ |
| 261 | u32 rcv_wup; /* rcv_nxt on last window update sent */ |
Arnaldo Carvalho de Melo | 3a137d2 | 2006-11-28 01:12:38 -0200 | [diff] [blame] | 262 | u32 snd_nxt; /* Next sequence we send */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | |
Arnaldo Carvalho de Melo | 3a137d2 | 2006-11-28 01:12:38 -0200 | [diff] [blame] | 264 | u32 snd_una; /* First byte we want an ack for */ |
| 265 | u32 snd_sml; /* Last byte of the most recently transmitted small packet */ |
| 266 | u32 rcv_tstamp; /* timestamp of last received ACK (for keepalives) */ |
| 267 | u32 lsndtime; /* timestamp of last sent data packet (for restart window) */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 268 | |
| 269 | /* Data for direct copy to user */ |
| 270 | struct { |
| 271 | struct sk_buff_head prequeue; |
| 272 | struct task_struct *task; |
| 273 | struct iovec *iov; |
| 274 | int memory; |
| 275 | int len; |
Chris Leech | 97fc2f0 | 2006-05-23 17:55:33 -0700 | [diff] [blame] | 276 | #ifdef CONFIG_NET_DMA |
| 277 | /* members for async copy */ |
| 278 | struct dma_chan *dma_chan; |
| 279 | int wakeup; |
| 280 | struct dma_pinned_list *pinned_list; |
| 281 | dma_cookie_t dma_cookie; |
| 282 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 283 | } ucopy; |
| 284 | |
Arnaldo Carvalho de Melo | 3a137d2 | 2006-11-28 01:12:38 -0200 | [diff] [blame] | 285 | u32 snd_wl1; /* Sequence for window update */ |
| 286 | u32 snd_wnd; /* The window we expect to receive */ |
| 287 | u32 max_window; /* Maximal window ever seen from peer */ |
| 288 | u32 mss_cache; /* Cached effective mss, not including SACKS */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | |
Arnaldo Carvalho de Melo | 3a137d2 | 2006-11-28 01:12:38 -0200 | [diff] [blame] | 290 | u32 window_clamp; /* Maximal window to advertise */ |
| 291 | u32 rcv_ssthresh; /* Current window clamp */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | |
Arnaldo Carvalho de Melo | 3a137d2 | 2006-11-28 01:12:38 -0200 | [diff] [blame] | 293 | u32 frto_highmark; /* snd_nxt when RTO occurred */ |
| 294 | u8 reordering; /* Packet reordering metric. */ |
| 295 | u8 frto_counter; /* Number of new acks after RTO */ |
| 296 | u8 nonagle; /* Disable Nagle algorithm? */ |
| 297 | u8 keepalive_probes; /* num of allowed keep alive probes */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | |
| 299 | /* RTT measurement */ |
Arnaldo Carvalho de Melo | 3a137d2 | 2006-11-28 01:12:38 -0200 | [diff] [blame] | 300 | u32 srtt; /* smoothed round trip time << 3 */ |
| 301 | u32 mdev; /* medium deviation */ |
| 302 | u32 mdev_max; /* maximal mdev for the last rtt period */ |
| 303 | u32 rttvar; /* smoothed mdev_max */ |
| 304 | u32 rtt_seq; /* sequence number to update rttvar */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 305 | |
Arnaldo Carvalho de Melo | 3a137d2 | 2006-11-28 01:12:38 -0200 | [diff] [blame] | 306 | u32 packets_out; /* Packets which are "in flight" */ |
Arnaldo Carvalho de Melo | 3a137d2 | 2006-11-28 01:12:38 -0200 | [diff] [blame] | 307 | u32 retrans_out; /* Retransmitted packets out */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | /* |
| 309 | * Options received (usually on last packet, some only on SYN packets). |
| 310 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 311 | struct tcp_options_received rx_opt; |
| 312 | |
| 313 | /* |
| 314 | * Slow start and congestion control (see also Nagle, and Karn & Partridge) |
| 315 | */ |
Arnaldo Carvalho de Melo | 3a137d2 | 2006-11-28 01:12:38 -0200 | [diff] [blame] | 316 | u32 snd_ssthresh; /* Slow start size threshold */ |
| 317 | u32 snd_cwnd; /* Sending congestion window */ |
Ilpo Järvinen | f78a1b3 | 2007-10-15 12:59:43 -0700 | [diff] [blame] | 318 | u32 snd_cwnd_cnt; /* Linear increase counter */ |
David S. Miller | e0ef57c | 2007-02-22 22:52:59 -0800 | [diff] [blame] | 319 | u32 snd_cwnd_clamp; /* Do not allow snd_cwnd to grow above this */ |
Arnaldo Carvalho de Melo | 3a137d2 | 2006-11-28 01:12:38 -0200 | [diff] [blame] | 320 | u32 snd_cwnd_used; |
| 321 | u32 snd_cwnd_stamp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | struct sk_buff_head out_of_order_queue; /* Out of order segments go here */ |
| 324 | |
Arnaldo Carvalho de Melo | 3a137d2 | 2006-11-28 01:12:38 -0200 | [diff] [blame] | 325 | u32 rcv_wnd; /* Current receiver window */ |
Arnaldo Carvalho de Melo | 3a137d2 | 2006-11-28 01:12:38 -0200 | [diff] [blame] | 326 | u32 write_seq; /* Tail(+1) of data held in tcp send buffer */ |
| 327 | u32 pushed_seq; /* Last pushed seq, required to talk to windows */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | |
| 329 | /* SACKs data */ |
| 330 | struct tcp_sack_block duplicate_sack[1]; /* D-SACK block */ |
| 331 | struct tcp_sack_block selective_acks[4]; /* The SACKS themselves*/ |
| 332 | |
Baruch Even | 6f74651 | 2007-02-04 23:36:42 -0800 | [diff] [blame] | 333 | struct tcp_sack_block_wire recv_sack_cache[4]; |
Stephen Hemminger | 6a438bb | 2005-11-10 17:14:59 -0800 | [diff] [blame] | 334 | |
Ilpo Järvinen | 13dae42 | 2007-08-10 14:31:21 -0700 | [diff] [blame] | 335 | u32 highest_sack; /* Start seq of globally highest revd SACK |
| 336 | * (validity guaranteed only if sacked_out > 0) */ |
Ilpo Järvinen | d738cd8 | 2007-03-24 21:03:23 -0700 | [diff] [blame] | 337 | |
Stephen Hemminger | 6a438bb | 2005-11-10 17:14:59 -0800 | [diff] [blame] | 338 | /* from STCP, retrans queue hinting */ |
| 339 | struct sk_buff* lost_skb_hint; |
| 340 | |
| 341 | struct sk_buff *scoreboard_skb_hint; |
| 342 | struct sk_buff *retransmit_skb_hint; |
| 343 | struct sk_buff *forward_skb_hint; |
| 344 | struct sk_buff *fastpath_skb_hint; |
| 345 | |
Ilpo Järvinen | c79e335 | 2007-10-07 23:37:25 -0700 | [diff] [blame] | 346 | int fastpath_cnt_hint; /* Lags behind by current skb's pcount |
| 347 | * compared to respective fackets_out */ |
Stephen Hemminger | 6a438bb | 2005-11-10 17:14:59 -0800 | [diff] [blame] | 348 | int lost_cnt_hint; |
| 349 | int retransmit_cnt_hint; |
Stephen Hemminger | 6a438bb | 2005-11-10 17:14:59 -0800 | [diff] [blame] | 350 | |
Ilpo Järvinen | b08d6cb | 2007-10-11 17:36:13 -0700 | [diff] [blame] | 351 | u32 lost_retrans_low; /* Sent seq after any rxmit (lowest) */ |
| 352 | |
Arnaldo Carvalho de Melo | 3a137d2 | 2006-11-28 01:12:38 -0200 | [diff] [blame] | 353 | u16 advmss; /* Advertised MSS */ |
| 354 | u16 prior_ssthresh; /* ssthresh saved at recovery start */ |
| 355 | u32 lost_out; /* Lost packets */ |
| 356 | u32 sacked_out; /* SACK'd packets */ |
| 357 | u32 fackets_out; /* FACK'd packets */ |
| 358 | u32 high_seq; /* snd_nxt at onset of congestion */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | |
Arnaldo Carvalho de Melo | 3a137d2 | 2006-11-28 01:12:38 -0200 | [diff] [blame] | 360 | u32 retrans_stamp; /* Timestamp of the last retransmit, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | * also used in SYN-SENT to remember stamp of |
| 362 | * the first SYN. */ |
Arnaldo Carvalho de Melo | 3a137d2 | 2006-11-28 01:12:38 -0200 | [diff] [blame] | 363 | u32 undo_marker; /* tracking retrans started here. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 364 | int undo_retrans; /* number of undoable retransmissions. */ |
Arnaldo Carvalho de Melo | 3a137d2 | 2006-11-28 01:12:38 -0200 | [diff] [blame] | 365 | u32 urg_seq; /* Seq of received urgent pointer */ |
| 366 | u16 urg_data; /* Saved octet of OOB data and control flags */ |
| 367 | u8 urg_mode; /* In urgent mode */ |
| 368 | u8 ecn_flags; /* ECN status bits. */ |
| 369 | u32 snd_up; /* Urgent pointer */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | |
Arnaldo Carvalho de Melo | 3a137d2 | 2006-11-28 01:12:38 -0200 | [diff] [blame] | 371 | u32 total_retrans; /* Total retransmits for entire connection */ |
| 372 | u32 bytes_acked; /* Appropriate Byte Counting - RFC3465 */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | unsigned int keepalive_time; /* time before keep alive takes place */ |
| 375 | unsigned int keepalive_intvl; /* time interval between keep alive probes */ |
| 376 | int linger2; |
| 377 | |
| 378 | unsigned long last_synq_overflow; |
| 379 | |
Arnaldo Carvalho de Melo | 3a137d2 | 2006-11-28 01:12:38 -0200 | [diff] [blame] | 380 | u32 tso_deferred; |
John Heffner | ae8064a | 2006-10-18 20:36:48 -0700 | [diff] [blame] | 381 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | /* Receiver side RTT estimation */ |
| 383 | struct { |
Arnaldo Carvalho de Melo | 3a137d2 | 2006-11-28 01:12:38 -0200 | [diff] [blame] | 384 | u32 rtt; |
| 385 | u32 seq; |
| 386 | u32 time; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | } rcv_rtt_est; |
| 388 | |
| 389 | /* Receiver queue space */ |
| 390 | struct { |
| 391 | int space; |
Arnaldo Carvalho de Melo | 3a137d2 | 2006-11-28 01:12:38 -0200 | [diff] [blame] | 392 | u32 seq; |
| 393 | u32 time; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | } rcvq_space; |
John Heffner | 0e7b136 | 2006-03-20 21:32:58 -0800 | [diff] [blame] | 395 | |
| 396 | /* TCP-specific MTU probe information. */ |
| 397 | struct { |
Arnaldo Carvalho de Melo | 3a137d2 | 2006-11-28 01:12:38 -0200 | [diff] [blame] | 398 | u32 probe_seq_start; |
| 399 | u32 probe_seq_end; |
John Heffner | 0e7b136 | 2006-03-20 21:32:58 -0800 | [diff] [blame] | 400 | } mtu_probe; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 401 | |
| 402 | #ifdef CONFIG_TCP_MD5SIG |
| 403 | /* TCP AF-Specific parts; only used by MD5 Signature support so far */ |
| 404 | struct tcp_sock_af_ops *af_specific; |
| 405 | |
| 406 | /* TCP MD5 Signagure Option information */ |
| 407 | struct tcp_md5sig_info *md5sig_info; |
| 408 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | }; |
| 410 | |
| 411 | static inline struct tcp_sock *tcp_sk(const struct sock *sk) |
| 412 | { |
| 413 | return (struct tcp_sock *)sk; |
| 414 | } |
| 415 | |
Arnaldo Carvalho de Melo | 8feaf0c | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 416 | struct tcp_timewait_sock { |
| 417 | struct inet_timewait_sock tw_sk; |
Arnaldo Carvalho de Melo | 3a137d2 | 2006-11-28 01:12:38 -0200 | [diff] [blame] | 418 | u32 tw_rcv_nxt; |
| 419 | u32 tw_snd_nxt; |
| 420 | u32 tw_rcv_wnd; |
| 421 | u32 tw_ts_recent; |
Arnaldo Carvalho de Melo | 8feaf0c | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 422 | long tw_ts_recent_stamp; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 423 | #ifdef CONFIG_TCP_MD5SIG |
Arnaldo Carvalho de Melo | 3a137d2 | 2006-11-28 01:12:38 -0200 | [diff] [blame] | 424 | u16 tw_md5_keylen; |
| 425 | u8 tw_md5_key[TCP_MD5SIG_MAXKEYLEN]; |
YOSHIFUJI Hideaki | cfb6eeb | 2006-11-14 19:07:45 -0800 | [diff] [blame] | 426 | #endif |
Arnaldo Carvalho de Melo | 8feaf0c | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 427 | }; |
| 428 | |
| 429 | static inline struct tcp_timewait_sock *tcp_twsk(const struct sock *sk) |
| 430 | { |
| 431 | return (struct tcp_timewait_sock *)sk; |
| 432 | } |
| 433 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 434 | #endif |
| 435 | |
| 436 | #endif /* _LINUX_TCP_H */ |