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1 /* 1 /*
2 * INET An implementation of the TCP/I 2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is imp 3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of comm 4 * interface as the means of communication with the user level.
5 * 5 *
6 * Definitions for the TCP protoc 6 * Definitions for the TCP protocol.
7 * 7 *
8 * Version: @(#)tcp.h 1.0.2 04/28/ 8 * Version: @(#)tcp.h 1.0.2 04/28/93
9 * 9 *
10 * Author: Fred N. van Kempen, <waltje@uW 10 * Author: Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
11 * 11 *
12 * This program is free software; 12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of t 13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Softw 14 * as published by the Free Software Foundation; either version
15 * 2 of the License, or (at your 15 * 2 of the License, or (at your option) any later version.
16 */ 16 */
17 #ifndef _LINUX_TCP_H 17 #ifndef _LINUX_TCP_H
18 #define _LINUX_TCP_H 18 #define _LINUX_TCP_H
19 19
20 #include <linux/types.h> 20 #include <linux/types.h>
21 #include <asm/byteorder.h> 21 #include <asm/byteorder.h>
22 #include <linux/socket.h> <<
23 22
24 struct tcphdr { 23 struct tcphdr {
25 __be16 source; !! 24 __u16 source;
26 __be16 dest; !! 25 __u16 dest;
27 __be32 seq; !! 26 __u32 seq;
28 __be32 ack_seq; !! 27 __u32 ack_seq;
29 #if defined(__LITTLE_ENDIAN_BITFIELD) 28 #if defined(__LITTLE_ENDIAN_BITFIELD)
30 __u16 res1:4, 29 __u16 res1:4,
31 doff:4, 30 doff:4,
32 fin:1, 31 fin:1,
33 syn:1, 32 syn:1,
34 rst:1, 33 rst:1,
35 psh:1, 34 psh:1,
36 ack:1, 35 ack:1,
37 urg:1, 36 urg:1,
38 ece:1, 37 ece:1,
39 cwr:1; 38 cwr:1;
40 #elif defined(__BIG_ENDIAN_BITFIELD) 39 #elif defined(__BIG_ENDIAN_BITFIELD)
41 __u16 doff:4, 40 __u16 doff:4,
42 res1:4, 41 res1:4,
43 cwr:1, 42 cwr:1,
44 ece:1, 43 ece:1,
45 urg:1, 44 urg:1,
46 ack:1, 45 ack:1,
47 psh:1, 46 psh:1,
48 rst:1, 47 rst:1,
49 syn:1, 48 syn:1,
50 fin:1; 49 fin:1;
51 #else 50 #else
52 #error "Adjust your <asm/byteorder.h> defines 51 #error "Adjust your <asm/byteorder.h> defines"
53 #endif 52 #endif
54 __be16 window; !! 53 __u16 window;
55 __sum16 check; !! 54 __u16 check;
56 __be16 urg_ptr; !! 55 __u16 urg_ptr;
>> 56 };
>> 57
>> 58
>> 59 enum {
>> 60 TCP_ESTABLISHED = 1,
>> 61 TCP_SYN_SENT,
>> 62 TCP_SYN_RECV,
>> 63 TCP_FIN_WAIT1,
>> 64 TCP_FIN_WAIT2,
>> 65 TCP_TIME_WAIT,
>> 66 TCP_CLOSE,
>> 67 TCP_CLOSE_WAIT,
>> 68 TCP_LAST_ACK,
>> 69 TCP_LISTEN,
>> 70 TCP_CLOSING, /* now a valid state */
>> 71
>> 72 TCP_MAX_STATES /* Leave at the end! */
>> 73 };
>> 74
>> 75 #define TCP_STATE_MASK 0xF
>> 76 #define TCP_ACTION_FIN (1 << 7)
>> 77
>> 78 enum {
>> 79 TCPF_ESTABLISHED = (1 << 1),
>> 80 TCPF_SYN_SENT = (1 << 2),
>> 81 TCPF_SYN_RECV = (1 << 3),
>> 82 TCPF_FIN_WAIT1 = (1 << 4),
>> 83 TCPF_FIN_WAIT2 = (1 << 5),
>> 84 TCPF_TIME_WAIT = (1 << 6),
>> 85 TCPF_CLOSE = (1 << 7),
>> 86 TCPF_CLOSE_WAIT = (1 << 8),
>> 87 TCPF_LAST_ACK = (1 << 9),
>> 88 TCPF_LISTEN = (1 << 10),
>> 89 TCPF_CLOSING = (1 << 11)
57 }; 90 };
58 91
59 /* 92 /*
60 * The union cast uses a gcc extension to 93 * The union cast uses a gcc extension to avoid aliasing problems
61 * (union is compatible to any of its members 94 * (union is compatible to any of its members)
62 * This means this part of the code is -fstri 95 * This means this part of the code is -fstrict-aliasing safe now.
63 */ 96 */
64 union tcp_word_hdr { 97 union tcp_word_hdr {
65 struct tcphdr hdr; 98 struct tcphdr hdr;
66 __be32 words[5]; !! 99 __u32 words[5];
67 }; 100 };
68 101
69 #define tcp_flag_word(tp) ( ((union tcp_word_h 102 #define tcp_flag_word(tp) ( ((union tcp_word_hdr *)(tp))->words [3])
70 103
71 enum { 104 enum {
72 TCP_FLAG_CWR = __constant_htonl(0x0080 105 TCP_FLAG_CWR = __constant_htonl(0x00800000),
73 TCP_FLAG_ECE = __constant_htonl(0x0040 106 TCP_FLAG_ECE = __constant_htonl(0x00400000),
74 TCP_FLAG_URG = __constant_htonl(0x0020 107 TCP_FLAG_URG = __constant_htonl(0x00200000),
75 TCP_FLAG_ACK = __constant_htonl(0x0010 108 TCP_FLAG_ACK = __constant_htonl(0x00100000),
76 TCP_FLAG_PSH = __constant_htonl(0x0008 109 TCP_FLAG_PSH = __constant_htonl(0x00080000),
77 TCP_FLAG_RST = __constant_htonl(0x0004 110 TCP_FLAG_RST = __constant_htonl(0x00040000),
78 TCP_FLAG_SYN = __constant_htonl(0x0002 111 TCP_FLAG_SYN = __constant_htonl(0x00020000),
79 TCP_FLAG_FIN = __constant_htonl(0x0001 112 TCP_FLAG_FIN = __constant_htonl(0x00010000),
80 TCP_RESERVED_BITS = __constant_htonl(0 113 TCP_RESERVED_BITS = __constant_htonl(0x0F000000),
81 TCP_DATA_OFFSET = __constant_htonl(0xF 114 TCP_DATA_OFFSET = __constant_htonl(0xF0000000)
82 }; 115 };
83 116
84 /* TCP socket options */ 117 /* TCP socket options */
85 #define TCP_NODELAY 1 /* Tur 118 #define TCP_NODELAY 1 /* Turn off Nagle's algorithm. */
86 #define TCP_MAXSEG 2 /* Lim 119 #define TCP_MAXSEG 2 /* Limit MSS */
87 #define TCP_CORK 3 /* Nev 120 #define TCP_CORK 3 /* Never send partially complete segments */
88 #define TCP_KEEPIDLE 4 /* Sta 121 #define TCP_KEEPIDLE 4 /* Start keeplives after this period */
89 #define TCP_KEEPINTVL 5 /* Int 122 #define TCP_KEEPINTVL 5 /* Interval between keepalives */
90 #define TCP_KEEPCNT 6 /* Num 123 #define TCP_KEEPCNT 6 /* Number of keepalives before death */
91 #define TCP_SYNCNT 7 /* Num 124 #define TCP_SYNCNT 7 /* Number of SYN retransmits */
92 #define TCP_LINGER2 8 /* Lif 125 #define TCP_LINGER2 8 /* Life time of orphaned FIN-WAIT-2 state */
93 #define TCP_DEFER_ACCEPT 9 /* Wak 126 #define TCP_DEFER_ACCEPT 9 /* Wake up listener only when data arrive */
94 #define TCP_WINDOW_CLAMP 10 /* Bou 127 #define TCP_WINDOW_CLAMP 10 /* Bound advertised window */
95 #define TCP_INFO 11 /* Inf 128 #define TCP_INFO 11 /* Information about this connection. */
96 #define TCP_QUICKACK 12 /* Blo 129 #define TCP_QUICKACK 12 /* Block/reenable quick acks */
97 #define TCP_CONGESTION 13 /* Con <<
98 #define TCP_MD5SIG 14 /* TCP <<
99 130
100 #define TCPI_OPT_TIMESTAMPS 1 131 #define TCPI_OPT_TIMESTAMPS 1
101 #define TCPI_OPT_SACK 2 132 #define TCPI_OPT_SACK 2
102 #define TCPI_OPT_WSCALE 4 133 #define TCPI_OPT_WSCALE 4
103 #define TCPI_OPT_ECN 8 134 #define TCPI_OPT_ECN 8
104 135
105 enum tcp_ca_state 136 enum tcp_ca_state
106 { 137 {
107 TCP_CA_Open = 0, 138 TCP_CA_Open = 0,
108 #define TCPF_CA_Open (1<<TCP_CA_Open) 139 #define TCPF_CA_Open (1<<TCP_CA_Open)
109 TCP_CA_Disorder = 1, 140 TCP_CA_Disorder = 1,
110 #define TCPF_CA_Disorder (1<<TCP_CA_Disorder) 141 #define TCPF_CA_Disorder (1<<TCP_CA_Disorder)
111 TCP_CA_CWR = 2, 142 TCP_CA_CWR = 2,
112 #define TCPF_CA_CWR (1<<TCP_CA_CWR) 143 #define TCPF_CA_CWR (1<<TCP_CA_CWR)
113 TCP_CA_Recovery = 3, 144 TCP_CA_Recovery = 3,
114 #define TCPF_CA_Recovery (1<<TCP_CA_Recovery) 145 #define TCPF_CA_Recovery (1<<TCP_CA_Recovery)
115 TCP_CA_Loss = 4 146 TCP_CA_Loss = 4
116 #define TCPF_CA_Loss (1<<TCP_CA_Loss) 147 #define TCPF_CA_Loss (1<<TCP_CA_Loss)
117 }; 148 };
118 149
119 struct tcp_info 150 struct tcp_info
120 { 151 {
121 __u8 tcpi_state; 152 __u8 tcpi_state;
122 __u8 tcpi_ca_state; 153 __u8 tcpi_ca_state;
123 __u8 tcpi_retransmits; 154 __u8 tcpi_retransmits;
124 __u8 tcpi_probes; 155 __u8 tcpi_probes;
125 __u8 tcpi_backoff; 156 __u8 tcpi_backoff;
126 __u8 tcpi_options; 157 __u8 tcpi_options;
127 __u8 tcpi_snd_wscale : 4, tcpi_rcv_ 158 __u8 tcpi_snd_wscale : 4, tcpi_rcv_wscale : 4;
128 159
129 __u32 tcpi_rto; 160 __u32 tcpi_rto;
130 __u32 tcpi_ato; 161 __u32 tcpi_ato;
131 __u32 tcpi_snd_mss; 162 __u32 tcpi_snd_mss;
132 __u32 tcpi_rcv_mss; 163 __u32 tcpi_rcv_mss;
133 164
134 __u32 tcpi_unacked; 165 __u32 tcpi_unacked;
135 __u32 tcpi_sacked; 166 __u32 tcpi_sacked;
136 __u32 tcpi_lost; 167 __u32 tcpi_lost;
137 __u32 tcpi_retrans; 168 __u32 tcpi_retrans;
138 __u32 tcpi_fackets; 169 __u32 tcpi_fackets;
139 170
140 /* Times. */ 171 /* Times. */
141 __u32 tcpi_last_data_sent; 172 __u32 tcpi_last_data_sent;
142 __u32 tcpi_last_ack_sent; /* Not 173 __u32 tcpi_last_ack_sent; /* Not remembered, sorry. */
143 __u32 tcpi_last_data_recv; 174 __u32 tcpi_last_data_recv;
144 __u32 tcpi_last_ack_recv; 175 __u32 tcpi_last_ack_recv;
145 176
146 /* Metrics. */ 177 /* Metrics. */
147 __u32 tcpi_pmtu; 178 __u32 tcpi_pmtu;
148 __u32 tcpi_rcv_ssthresh; 179 __u32 tcpi_rcv_ssthresh;
149 __u32 tcpi_rtt; 180 __u32 tcpi_rtt;
150 __u32 tcpi_rttvar; 181 __u32 tcpi_rttvar;
151 __u32 tcpi_snd_ssthresh; 182 __u32 tcpi_snd_ssthresh;
152 __u32 tcpi_snd_cwnd; 183 __u32 tcpi_snd_cwnd;
153 __u32 tcpi_advmss; 184 __u32 tcpi_advmss;
154 __u32 tcpi_reordering; 185 __u32 tcpi_reordering;
155 186
156 __u32 tcpi_rcv_rtt; 187 __u32 tcpi_rcv_rtt;
157 __u32 tcpi_rcv_space; 188 __u32 tcpi_rcv_space;
158 189
159 __u32 tcpi_total_retrans; 190 __u32 tcpi_total_retrans;
160 }; 191 };
161 192
162 /* for TCP_MD5SIG socket option */ <<
163 #define TCP_MD5SIG_MAXKEYLEN 80 <<
164 <<
165 struct tcp_md5sig { <<
166 struct __kernel_sockaddr_storage tcpm_ <<
167 __u16 __tcpm_pad1; <<
168 __u16 tcpm_keylen; <<
169 __u32 __tcpm_pad2; <<
170 __u8 tcpm_key[TCP_MD5SIG_MAXKEYLEN] <<
171 }; <<
172 <<
173 #ifdef __KERNEL__ 193 #ifdef __KERNEL__
174 194
>> 195 #include <linux/config.h>
175 #include <linux/skbuff.h> 196 #include <linux/skbuff.h>
176 #include <linux/dmaengine.h> !! 197 #include <linux/ip.h>
177 #include <net/sock.h> 198 #include <net/sock.h>
178 #include <net/inet_connection_sock.h> <<
179 #include <net/inet_timewait_sock.h> <<
180 <<
181 static inline struct tcphdr *tcp_hdr(const str <<
182 { <<
183 return (struct tcphdr *)skb_transport_ <<
184 } <<
185 <<
186 static inline unsigned int tcp_hdrlen(const st <<
187 { <<
188 return tcp_hdr(skb)->doff * 4; <<
189 } <<
190 <<
191 static inline unsigned int tcp_optlen(const st <<
192 { <<
193 return (tcp_hdr(skb)->doff - 5) * 4; <<
194 } <<
195 199
196 /* This defines a selective acknowledgement bl 200 /* This defines a selective acknowledgement block. */
197 struct tcp_sack_block_wire { !! 201 struct tcp_sack_block {
198 __be32 start_seq; !! 202 __u32 start_seq;
199 __be32 end_seq; !! 203 __u32 end_seq;
200 }; 204 };
201 205
202 struct tcp_sack_block { !! 206 enum tcp_congestion_algo {
203 u32 start_seq; !! 207 TCP_RENO=0,
204 u32 end_seq; !! 208 TCP_VEGAS,
>> 209 TCP_WESTWOOD,
>> 210 TCP_BIC,
205 }; 211 };
206 212
207 struct tcp_options_received { 213 struct tcp_options_received {
208 /* PAWS/RTTM data */ 214 /* PAWS/RTTM data */
209 long ts_recent_stamp;/* Time we sto 215 long ts_recent_stamp;/* Time we stored ts_recent (for aging) */
210 u32 ts_recent; /* Time stamp !! 216 __u32 ts_recent; /* Time stamp to echo next */
211 u32 rcv_tsval; /* Time stamp !! 217 __u32 rcv_tsval; /* Time stamp value */
212 u32 rcv_tsecr; /* Time stamp !! 218 __u32 rcv_tsecr; /* Time stamp echo reply */
213 u16 saw_tstamp : 1, /* Saw TIMESTA !! 219 char saw_tstamp; /* Saw TIMESTAMP on last packet */
214 tstamp_ok : 1, /* TIMESTAMP s !! 220 char tstamp_ok; /* TIMESTAMP seen on SYN packet */
215 dsack : 1, /* D-SACK is s !! 221 char sack_ok; /* SACK seen on SYN packet */
216 wscale_ok : 1, /* Wscale seen !! 222 char wscale_ok; /* Wscale seen on SYN packet */
217 sack_ok : 4, /* SACK seen o !! 223 __u8 snd_wscale; /* Window scaling received from sender */
218 snd_wscale : 4, /* Window scal !! 224 __u8 rcv_wscale; /* Window scaling to send to receiver */
219 rcv_wscale : 4; /* Window scal <<
220 /* SACKs data */ 225 /* SACKs data */
221 u8 eff_sacks; /* Size of SAC !! 226 __u8 dsack; /* D-SACK is scheduled */
222 u8 num_sacks; /* Number of S !! 227 __u8 eff_sacks; /* Size of SACK array to send with next packet */
223 u16 user_mss; /* mss request !! 228 __u8 num_sacks; /* Number of SACK blocks */
224 u16 mss_clamp; /* Maximal mss !! 229 __u8 __pad;
225 }; !! 230 __u16 user_mss; /* mss requested by user in ioctl */
226 !! 231 __u16 mss_clamp; /* Maximal mss, negotiated at connection setup */
227 struct tcp_request_sock { <<
228 struct inet_request_sock req; <<
229 #ifdef CONFIG_TCP_MD5SIG <<
230 /* Only used by TCP MD5 Signature so f <<
231 struct tcp_request_sock_ops *af_sp <<
232 #endif <<
233 u32 rcv_is <<
234 u32 snt_is <<
235 }; 232 };
236 233
237 static inline struct tcp_request_sock *tcp_rsk <<
238 { <<
239 return (struct tcp_request_sock *)req; <<
240 } <<
241 <<
242 struct tcp_sock { 234 struct tcp_sock {
243 /* inet_connection_sock has to be the !! 235 /* inet_sock has to be the first member of tcp_sock */
244 struct inet_connection_sock inet_c !! 236 struct inet_sock inet;
245 u16 tcp_header_len; /* Bytes of tc !! 237 int tcp_header_len; /* Bytes of tcp header to send */
246 u16 xmit_size_goal; /* Goal for se <<
247 238
248 /* 239 /*
249 * Header prediction flags 240 * Header prediction flags
250 * 0x5?10 << 16 + snd_wnd in net byte ord 241 * 0x5?10 << 16 + snd_wnd in net byte order
251 */ 242 */
252 __be32 pred_flags; !! 243 __u32 pred_flags;
253 244
254 /* 245 /*
255 * RFC793 variables by their proper names 246 * RFC793 variables by their proper names. This means you can
256 * read the code and the spec side by sid 247 * read the code and the spec side by side (and laugh ...)
257 * See RFC793 and RFC1122. The RFC writes 248 * See RFC793 and RFC1122. The RFC writes these in capitals.
258 */ 249 */
259 u32 rcv_nxt; /* What we wan !! 250 __u32 rcv_nxt; /* What we want to receive next */
260 u32 copied_seq; /* Head of yet !! 251 __u32 snd_nxt; /* Next sequence we send */
261 u32 rcv_wup; /* rcv_nxt on !! 252
262 u32 snd_nxt; /* Next sequen !! 253 __u32 snd_una; /* First byte we want an ack for */
263 !! 254 __u32 snd_sml; /* Last byte of the most recently transmitted small packet */
264 u32 snd_una; /* First byte !! 255 __u32 rcv_tstamp; /* timestamp of last received ACK (for keepalives) */
265 u32 snd_sml; /* Last byte o !! 256 __u32 lsndtime; /* timestamp of last sent data packet (for restart window) */
266 u32 rcv_tstamp; /* timestamp o !! 257 struct tcp_bind_bucket *bind_hash;
267 u32 lsndtime; /* timestamp o !! 258 /* Delayed ACK control data */
>> 259 struct {
>> 260 __u8 pending; /* ACK is pending */
>> 261 __u8 quick; /* Scheduled number of quick acks */
>> 262 __u8 pingpong; /* The session is interactive */
>> 263 __u8 blocked; /* Delayed ACK was blocked by socket lock*/
>> 264 __u32 ato; /* Predicted tick of soft clock */
>> 265 unsigned long timeout; /* Currently scheduled timeout */
>> 266 __u32 lrcvtime; /* timestamp of last received data packet*/
>> 267 __u16 last_seg_size; /* Size of last incoming segment */
>> 268 __u16 rcv_mss; /* MSS used for delayed ACK decisions */
>> 269 } ack;
268 270
269 /* Data for direct copy to user */ 271 /* Data for direct copy to user */
270 struct { 272 struct {
271 struct sk_buff_head preque 273 struct sk_buff_head prequeue;
272 struct task_struct *task; 274 struct task_struct *task;
273 struct iovec *iov; 275 struct iovec *iov;
274 int memory 276 int memory;
275 int len; 277 int len;
276 #ifdef CONFIG_NET_DMA <<
277 /* members for async copy */ <<
278 struct dma_chan *dma_c <<
279 int wakeup <<
280 struct dma_pinned_list *pinne <<
281 dma_cookie_t dma_co <<
282 #endif <<
283 } ucopy; 278 } ucopy;
284 279
285 u32 snd_wl1; /* Sequence fo !! 280 __u32 snd_wl1; /* Sequence for window update */
286 u32 snd_wnd; /* The window !! 281 __u32 snd_wnd; /* The window we expect to receive */
287 u32 max_window; /* Maximal win !! 282 __u32 max_window; /* Maximal window ever seen from peer */
288 u32 mss_cache; /* Cached effe !! 283 __u32 pmtu_cookie; /* Last pmtu seen by socket */
289 !! 284 __u32 mss_cache; /* Cached effective mss, not including SACKS */
290 u32 window_clamp; /* Maximal win !! 285 __u16 mss_cache_std; /* Like mss_cache, but without TSO */
291 u32 rcv_ssthresh; /* Current win !! 286 __u16 ext_header_len; /* Network protocol overhead (IP/IPv6 options) */
292 !! 287 __u16 ext2_header_len;/* Options depending on route */
293 u32 frto_highmark; /* snd_nxt whe !! 288 __u8 ca_state; /* State of fast-retransmit machine */
294 u8 reordering; /* Packet reor !! 289 __u8 retransmits; /* Number of unrecovered RTO timeouts. */
295 u8 frto_counter; /* Number of n !! 290
296 u8 nonagle; /* Disable Nag !! 291 __u32 frto_highmark; /* snd_nxt when RTO occurred */
297 u8 keepalive_probes; /* num of al !! 292 __u8 reordering; /* Packet reordering metric. */
>> 293 __u8 frto_counter; /* Number of new acks after RTO */
298 294
299 /* RTT measurement */ !! 295 __u8 adv_cong; /* Using Vegas, Westwood, or BIC */
300 u32 srtt; /* smoothed ro !! 296 __u8 defer_accept; /* User waits for some data after accept() */
301 u32 mdev; /* medium devi <<
302 u32 mdev_max; /* maximal mde <<
303 u32 rttvar; /* smoothed md <<
304 u32 rtt_seq; /* sequence nu <<
305 297
306 u32 packets_out; /* Packets whi !! 298 /* RTT measurement */
307 u32 retrans_out; /* Retransmitt !! 299 __u32 srtt; /* smoothed round trip time << 3 */
>> 300 __u32 mdev; /* medium deviation */
>> 301 __u32 mdev_max; /* maximal mdev for the last rtt period */
>> 302 __u32 rttvar; /* smoothed mdev_max */
>> 303 __u32 rtt_seq; /* sequence number to update rttvar */
>> 304 __u32 rto; /* retransmit timeout */
>> 305
>> 306 __u32 packets_out; /* Packets which are "in flight" */
>> 307 __u32 left_out; /* Packets which leaved network */
>> 308 __u32 retrans_out; /* Retransmitted packets out */
>> 309 __u8 backoff; /* backoff */
308 /* 310 /*
309 * Options received (usually on last pack 311 * Options received (usually on last packet, some only on SYN packets).
310 */ 312 */
>> 313 __u8 nonagle; /* Disable Nagle algorithm? */
>> 314 __u8 keepalive_probes; /* num of allowed keep alive probes */
>> 315
>> 316 __u8 probes_out; /* unanswered 0 window probes */
311 struct tcp_options_received rx_opt; 317 struct tcp_options_received rx_opt;
312 318
313 /* 319 /*
314 * Slow start and congestion control (see 320 * Slow start and congestion control (see also Nagle, and Karn & Partridge)
315 */ 321 */
316 u32 snd_ssthresh; /* Slow start !! 322 __u32 snd_ssthresh; /* Slow start size threshold */
317 u32 snd_cwnd; /* Sending con !! 323 __u32 snd_cwnd; /* Sending congestion window */
318 u32 snd_cwnd_cnt; /* Linear incr !! 324 __u16 snd_cwnd_cnt; /* Linear increase counter */
319 u32 snd_cwnd_clamp; /* Do not allo !! 325 __u16 snd_cwnd_clamp; /* Do not allow snd_cwnd to grow above this */
320 u32 snd_cwnd_used; !! 326 __u32 snd_cwnd_used;
321 u32 snd_cwnd_stamp; !! 327 __u32 snd_cwnd_stamp;
>> 328
>> 329 /* Two commonly used timers in both sender and receiver paths. */
>> 330 unsigned long timeout;
>> 331 struct timer_list retransmit_timer; /* Resend (no ack) */
>> 332 struct timer_list delack_timer; /* Ack delay */
322 333
323 struct sk_buff_head out_of_order_q 334 struct sk_buff_head out_of_order_queue; /* Out of order segments go here */
324 335
325 u32 rcv_wnd; /* Current rec !! 336 struct tcp_func *af_specific; /* Operations which are AF_INET{4,6} specific */
326 u32 write_seq; /* Tail(+1) of !! 337
327 u32 pushed_seq; /* Last pushed !! 338 __u32 rcv_wnd; /* Current receiver window */
>> 339 __u32 rcv_wup; /* rcv_nxt on last window update sent */
>> 340 __u32 write_seq; /* Tail(+1) of data held in tcp send buffer */
>> 341 __u32 pushed_seq; /* Last pushed seq, required to talk to windows */
>> 342 __u32 copied_seq; /* Head of yet unread data */
328 343
329 /* SACKs data */ 344 /* SACKs data */
330 struct tcp_sack_block duplicate_sack[1 345 struct tcp_sack_block duplicate_sack[1]; /* D-SACK block */
331 struct tcp_sack_block selective_acks[4 346 struct tcp_sack_block selective_acks[4]; /* The SACKS themselves*/
332 347
333 struct tcp_sack_block recv_sack_cache[ !! 348 __u32 window_clamp; /* Maximal window to advertise */
334 !! 349 __u32 rcv_ssthresh; /* Current window clamp */
335 struct sk_buff *highest_sack; /* hig !! 350 __u16 advmss; /* Advertised MSS */
336 * (va !! 351
337 * sac !! 352 __u8 syn_retries; /* num of allowed syn retries */
338 */ !! 353 __u8 ecn_flags; /* ECN status bits. */
339 !! 354 __u16 prior_ssthresh; /* ssthresh saved at recovery start */
340 /* from STCP, retrans queue hinting */ !! 355 __u16 __pad1;
341 struct sk_buff* lost_skb_hint; !! 356 __u32 lost_out; /* Lost packets */
342 !! 357 __u32 sacked_out; /* SACK'd packets */
343 struct sk_buff *scoreboard_skb_hint; !! 358 __u32 fackets_out; /* FACK'd packets */
344 struct sk_buff *retransmit_skb_hint; !! 359 __u32 high_seq; /* snd_nxt at onset of congestion */
345 struct sk_buff *forward_skb_hint; <<
346 <<
347 int lost_cnt_hint; <<
348 int retransmit_cnt_hint; <<
349 <<
350 u32 lost_retrans_low; /* Sen <<
351 360
352 u16 advmss; /* Advertised !! 361 __u32 retrans_stamp; /* Timestamp of the last retransmit,
353 u16 prior_ssthresh; /* ssthresh sa <<
354 u32 lost_out; /* Lost packet <<
355 u32 sacked_out; /* SACK'd pack <<
356 u32 fackets_out; /* FACK'd pack <<
357 u32 high_seq; /* snd_nxt at <<
358 <<
359 u32 retrans_stamp; /* Timestamp o <<
360 * also used i 362 * also used in SYN-SENT to remember stamp of
361 * the first S 363 * the first SYN. */
362 u32 undo_marker; /* tracking re !! 364 __u32 undo_marker; /* tracking retrans started here. */
363 int undo_retrans; /* number of u 365 int undo_retrans; /* number of undoable retransmissions. */
364 u32 urg_seq; /* Seq of rece !! 366 __u32 urg_seq; /* Seq of received urgent pointer */
365 u16 urg_data; /* Saved octet !! 367 __u16 urg_data; /* Saved octet of OOB data and control flags */
366 u8 urg_mode; /* In urgent m !! 368 __u8 pending; /* Scheduled timer event */
367 u8 ecn_flags; /* ECN status !! 369 __u8 urg_mode; /* In urgent mode */
368 u32 snd_up; /* Urgent poin !! 370 __u32 snd_up; /* Urgent pointer */
369 !! 371
370 u32 total_retrans; /* Total retra !! 372 __u32 total_retrans; /* Total retransmits for entire connection */
371 u32 bytes_acked; /* Appropriate !! 373
>> 374 /* The syn_wait_lock is necessary only to avoid proc interface having
>> 375 * to grab the main lock sock while browsing the listening hash
>> 376 * (otherwise it's deadlock prone).
>> 377 * This lock is acquired in read mode only from listening_get_next()
>> 378 * and it's acquired in write mode _only_ from code that is actively
>> 379 * changing the syn_wait_queue. All readers that are holding
>> 380 * the master sock lock don't need to grab this lock in read mode
>> 381 * too as the syn_wait_queue writes are always protected from
>> 382 * the main sock lock.
>> 383 */
>> 384 rwlock_t syn_wait_lock;
>> 385 struct tcp_listen_opt *listen_opt;
>> 386
>> 387 /* FIFO of established children */
>> 388 struct open_request *accept_queue;
>> 389 struct open_request *accept_queue_tail;
372 390
373 unsigned int keepalive_time 391 unsigned int keepalive_time; /* time before keep alive takes place */
374 unsigned int keepalive_intv 392 unsigned int keepalive_intvl; /* time interval between keep alive probes */
375 int linger2; 393 int linger2;
376 394
377 unsigned long last_synq_overflow; 395 unsigned long last_synq_overflow;
378 396
379 u32 tso_deferred; <<
380 <<
381 /* Receiver side RTT estimation */ 397 /* Receiver side RTT estimation */
382 struct { 398 struct {
383 u32 rtt; !! 399 __u32 rtt;
384 u32 seq; !! 400 __u32 seq;
385 u32 time; !! 401 __u32 time;
386 } rcv_rtt_est; 402 } rcv_rtt_est;
387 403
388 /* Receiver queue space */ 404 /* Receiver queue space */
389 struct { 405 struct {
390 int space; 406 int space;
391 u32 seq; !! 407 __u32 seq;
392 u32 time; !! 408 __u32 time;
393 } rcvq_space; 409 } rcvq_space;
394 410
395 /* TCP-specific MTU probe information. */ !! 411 /* TCP Westwood structure */
>> 412 struct {
>> 413 __u32 bw_ns_est; /* first bandwidth estimation..not too smoothed 8) */
>> 414 __u32 bw_est; /* bandwidth estimate */
>> 415 __u32 rtt_win_sx; /* here starts a new evaluation... */
>> 416 __u32 bk;
>> 417 __u32 snd_una; /* used for evaluating the number of acked bytes */
>> 418 __u32 cumul_ack;
>> 419 __u32 accounted;
>> 420 __u32 rtt;
>> 421 __u32 rtt_min; /* minimum observed RTT */
>> 422 } westwood;
>> 423
>> 424 /* Vegas variables */
396 struct { 425 struct {
397 u32 probe_seq_st !! 426 __u32 beg_snd_nxt; /* right edge during last RTT */
398 u32 probe_seq_en !! 427 __u32 beg_snd_una; /* left edge during last RTT */
399 } mtu_probe; !! 428 __u32 beg_snd_cwnd; /* saves the size of the cwnd */
400 !! 429 __u8 doing_vegas_now;/* if true, do vegas for this RTT */
401 #ifdef CONFIG_TCP_MD5SIG !! 430 __u16 cntRTT; /* # of RTTs measured within last RTT */
402 /* TCP AF-Specific parts; only used by MD5 Sig !! 431 __u32 minRTT; /* min of RTTs measured within last RTT (in usec) */
403 struct tcp_sock_af_ops *af_specific; !! 432 __u32 baseRTT; /* the min of all Vegas RTT measurements seen (in usec) */
>> 433 } vegas;
404 434
405 /* TCP MD5 Signagure Option information */ !! 435 /* BI TCP Parameters */
406 struct tcp_md5sig_info *md5sig_info; !! 436 struct {
407 #endif !! 437 __u32 cnt; /* increase cwnd by 1 after this number of ACKs */
>> 438 __u32 last_max_cwnd; /* last maximium snd_cwnd */
>> 439 __u32 last_cwnd; /* the last snd_cwnd */
>> 440 __u32 last_stamp; /* time when updated last_cwnd */
>> 441 } bictcp;
408 }; 442 };
409 443
410 static inline struct tcp_sock *tcp_sk(const st 444 static inline struct tcp_sock *tcp_sk(const struct sock *sk)
411 { 445 {
412 return (struct tcp_sock *)sk; 446 return (struct tcp_sock *)sk;
413 } 447 }
414 448
415 struct tcp_timewait_sock { <<
416 struct inet_timewait_sock tw_sk; <<
417 u32 tw_rcv_nxt; <<
418 u32 tw_snd_nxt; <<
419 u32 tw_rcv_wnd; <<
420 u32 tw_ts_recent <<
421 long tw_ts_recent <<
422 #ifdef CONFIG_TCP_MD5SIG <<
423 u16 tw_md5_keyle <<
424 u8 tw_md5_key[T <<
425 #endif <<
426 }; <<
427 <<
428 static inline struct tcp_timewait_sock *tcp_tw <<
429 { <<
430 return (struct tcp_timewait_sock *)sk; <<
431 } <<
432 <<
433 #endif 449 #endif
434 450
435 #endif /* _LINUX_TCP_H */ 451 #endif /* _LINUX_TCP_H */
436 452
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