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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> 22 #include <linux/socket.h>
23 23
24 struct tcphdr { 24 struct tcphdr {
25 __be16 source; 25 __be16 source;
26 __be16 dest; 26 __be16 dest;
27 __be32 seq; 27 __be32 seq;
28 __be32 ack_seq; 28 __be32 ack_seq;
29 #if defined(__LITTLE_ENDIAN_BITFIELD) 29 #if defined(__LITTLE_ENDIAN_BITFIELD)
30 __u16 res1:4, 30 __u16 res1:4,
31 doff:4, 31 doff:4,
32 fin:1, 32 fin:1,
33 syn:1, 33 syn:1,
34 rst:1, 34 rst:1,
35 psh:1, 35 psh:1,
36 ack:1, 36 ack:1,
37 urg:1, 37 urg:1,
38 ece:1, 38 ece:1,
39 cwr:1; 39 cwr:1;
40 #elif defined(__BIG_ENDIAN_BITFIELD) 40 #elif defined(__BIG_ENDIAN_BITFIELD)
41 __u16 doff:4, 41 __u16 doff:4,
42 res1:4, 42 res1:4,
43 cwr:1, 43 cwr:1,
44 ece:1, 44 ece:1,
45 urg:1, 45 urg:1,
46 ack:1, 46 ack:1,
47 psh:1, 47 psh:1,
48 rst:1, 48 rst:1,
49 syn:1, 49 syn:1,
50 fin:1; 50 fin:1;
51 #else 51 #else
52 #error "Adjust your <asm/byteorder.h> defines 52 #error "Adjust your <asm/byteorder.h> defines"
53 #endif 53 #endif
54 __be16 window; 54 __be16 window;
55 __sum16 check; 55 __sum16 check;
56 __be16 urg_ptr; 56 __be16 urg_ptr;
57 }; 57 };
58 58
59 /* 59 /*
60 * The union cast uses a gcc extension to 60 * The union cast uses a gcc extension to avoid aliasing problems
61 * (union is compatible to any of its members 61 * (union is compatible to any of its members)
62 * This means this part of the code is -fstri 62 * This means this part of the code is -fstrict-aliasing safe now.
63 */ 63 */
64 union tcp_word_hdr { 64 union tcp_word_hdr {
65 struct tcphdr hdr; 65 struct tcphdr hdr;
66 __be32 words[5]; 66 __be32 words[5];
67 }; 67 };
68 68
69 #define tcp_flag_word(tp) ( ((union tcp_word_h 69 #define tcp_flag_word(tp) ( ((union tcp_word_hdr *)(tp))->words [3])
70 70
71 enum { 71 enum {
72 TCP_FLAG_CWR = __constant_htonl(0x0080 !! 72 TCP_FLAG_CWR = __cpu_to_be32(0x00800000),
73 TCP_FLAG_ECE = __constant_htonl(0x0040 !! 73 TCP_FLAG_ECE = __cpu_to_be32(0x00400000),
74 TCP_FLAG_URG = __constant_htonl(0x0020 !! 74 TCP_FLAG_URG = __cpu_to_be32(0x00200000),
75 TCP_FLAG_ACK = __constant_htonl(0x0010 !! 75 TCP_FLAG_ACK = __cpu_to_be32(0x00100000),
76 TCP_FLAG_PSH = __constant_htonl(0x0008 !! 76 TCP_FLAG_PSH = __cpu_to_be32(0x00080000),
77 TCP_FLAG_RST = __constant_htonl(0x0004 !! 77 TCP_FLAG_RST = __cpu_to_be32(0x00040000),
78 TCP_FLAG_SYN = __constant_htonl(0x0002 !! 78 TCP_FLAG_SYN = __cpu_to_be32(0x00020000),
79 TCP_FLAG_FIN = __constant_htonl(0x0001 !! 79 TCP_FLAG_FIN = __cpu_to_be32(0x00010000),
80 TCP_RESERVED_BITS = __constant_htonl(0 !! 80 TCP_RESERVED_BITS = __cpu_to_be32(0x0F000000),
81 TCP_DATA_OFFSET = __constant_htonl(0xF !! 81 TCP_DATA_OFFSET = __cpu_to_be32(0xF0000000)
82 }; 82 };
83 83
84 /* TCP socket options */ 84 /* TCP socket options */
85 #define TCP_NODELAY 1 /* Tur 85 #define TCP_NODELAY 1 /* Turn off Nagle's algorithm. */
86 #define TCP_MAXSEG 2 /* Lim 86 #define TCP_MAXSEG 2 /* Limit MSS */
87 #define TCP_CORK 3 /* Nev 87 #define TCP_CORK 3 /* Never send partially complete segments */
88 #define TCP_KEEPIDLE 4 /* Sta 88 #define TCP_KEEPIDLE 4 /* Start keeplives after this period */
89 #define TCP_KEEPINTVL 5 /* Int 89 #define TCP_KEEPINTVL 5 /* Interval between keepalives */
90 #define TCP_KEEPCNT 6 /* Num 90 #define TCP_KEEPCNT 6 /* Number of keepalives before death */
91 #define TCP_SYNCNT 7 /* Num 91 #define TCP_SYNCNT 7 /* Number of SYN retransmits */
92 #define TCP_LINGER2 8 /* Lif 92 #define TCP_LINGER2 8 /* Life time of orphaned FIN-WAIT-2 state */
93 #define TCP_DEFER_ACCEPT 9 /* Wak 93 #define TCP_DEFER_ACCEPT 9 /* Wake up listener only when data arrive */
94 #define TCP_WINDOW_CLAMP 10 /* Bou 94 #define TCP_WINDOW_CLAMP 10 /* Bound advertised window */
95 #define TCP_INFO 11 /* Inf 95 #define TCP_INFO 11 /* Information about this connection. */
96 #define TCP_QUICKACK 12 /* Blo 96 #define TCP_QUICKACK 12 /* Block/reenable quick acks */
97 #define TCP_CONGESTION 13 /* Con 97 #define TCP_CONGESTION 13 /* Congestion control algorithm */
98 #define TCP_MD5SIG 14 /* TCP 98 #define TCP_MD5SIG 14 /* TCP MD5 Signature (RFC2385) */
99 99
100 #define TCPI_OPT_TIMESTAMPS 1 100 #define TCPI_OPT_TIMESTAMPS 1
101 #define TCPI_OPT_SACK 2 101 #define TCPI_OPT_SACK 2
102 #define TCPI_OPT_WSCALE 4 102 #define TCPI_OPT_WSCALE 4
103 #define TCPI_OPT_ECN 8 103 #define TCPI_OPT_ECN 8
104 104
105 enum tcp_ca_state 105 enum tcp_ca_state
106 { 106 {
107 TCP_CA_Open = 0, 107 TCP_CA_Open = 0,
108 #define TCPF_CA_Open (1<<TCP_CA_Open) 108 #define TCPF_CA_Open (1<<TCP_CA_Open)
109 TCP_CA_Disorder = 1, 109 TCP_CA_Disorder = 1,
110 #define TCPF_CA_Disorder (1<<TCP_CA_Disorder) 110 #define TCPF_CA_Disorder (1<<TCP_CA_Disorder)
111 TCP_CA_CWR = 2, 111 TCP_CA_CWR = 2,
112 #define TCPF_CA_CWR (1<<TCP_CA_CWR) 112 #define TCPF_CA_CWR (1<<TCP_CA_CWR)
113 TCP_CA_Recovery = 3, 113 TCP_CA_Recovery = 3,
114 #define TCPF_CA_Recovery (1<<TCP_CA_Recovery) 114 #define TCPF_CA_Recovery (1<<TCP_CA_Recovery)
115 TCP_CA_Loss = 4 115 TCP_CA_Loss = 4
116 #define TCPF_CA_Loss (1<<TCP_CA_Loss) 116 #define TCPF_CA_Loss (1<<TCP_CA_Loss)
117 }; 117 };
118 118
119 struct tcp_info 119 struct tcp_info
120 { 120 {
121 __u8 tcpi_state; 121 __u8 tcpi_state;
122 __u8 tcpi_ca_state; 122 __u8 tcpi_ca_state;
123 __u8 tcpi_retransmits; 123 __u8 tcpi_retransmits;
124 __u8 tcpi_probes; 124 __u8 tcpi_probes;
125 __u8 tcpi_backoff; 125 __u8 tcpi_backoff;
126 __u8 tcpi_options; 126 __u8 tcpi_options;
127 __u8 tcpi_snd_wscale : 4, tcpi_rcv_ 127 __u8 tcpi_snd_wscale : 4, tcpi_rcv_wscale : 4;
128 128
129 __u32 tcpi_rto; 129 __u32 tcpi_rto;
130 __u32 tcpi_ato; 130 __u32 tcpi_ato;
131 __u32 tcpi_snd_mss; 131 __u32 tcpi_snd_mss;
132 __u32 tcpi_rcv_mss; 132 __u32 tcpi_rcv_mss;
133 133
134 __u32 tcpi_unacked; 134 __u32 tcpi_unacked;
135 __u32 tcpi_sacked; 135 __u32 tcpi_sacked;
136 __u32 tcpi_lost; 136 __u32 tcpi_lost;
137 __u32 tcpi_retrans; 137 __u32 tcpi_retrans;
138 __u32 tcpi_fackets; 138 __u32 tcpi_fackets;
139 139
140 /* Times. */ 140 /* Times. */
141 __u32 tcpi_last_data_sent; 141 __u32 tcpi_last_data_sent;
142 __u32 tcpi_last_ack_sent; /* Not 142 __u32 tcpi_last_ack_sent; /* Not remembered, sorry. */
143 __u32 tcpi_last_data_recv; 143 __u32 tcpi_last_data_recv;
144 __u32 tcpi_last_ack_recv; 144 __u32 tcpi_last_ack_recv;
145 145
146 /* Metrics. */ 146 /* Metrics. */
147 __u32 tcpi_pmtu; 147 __u32 tcpi_pmtu;
148 __u32 tcpi_rcv_ssthresh; 148 __u32 tcpi_rcv_ssthresh;
149 __u32 tcpi_rtt; 149 __u32 tcpi_rtt;
150 __u32 tcpi_rttvar; 150 __u32 tcpi_rttvar;
151 __u32 tcpi_snd_ssthresh; 151 __u32 tcpi_snd_ssthresh;
152 __u32 tcpi_snd_cwnd; 152 __u32 tcpi_snd_cwnd;
153 __u32 tcpi_advmss; 153 __u32 tcpi_advmss;
154 __u32 tcpi_reordering; 154 __u32 tcpi_reordering;
155 155
156 __u32 tcpi_rcv_rtt; 156 __u32 tcpi_rcv_rtt;
157 __u32 tcpi_rcv_space; 157 __u32 tcpi_rcv_space;
158 158
159 __u32 tcpi_total_retrans; 159 __u32 tcpi_total_retrans;
160 }; 160 };
161 161
162 /* for TCP_MD5SIG socket option */ 162 /* for TCP_MD5SIG socket option */
163 #define TCP_MD5SIG_MAXKEYLEN 80 163 #define TCP_MD5SIG_MAXKEYLEN 80
164 164
165 struct tcp_md5sig { 165 struct tcp_md5sig {
166 struct __kernel_sockaddr_storage tcpm_ 166 struct __kernel_sockaddr_storage tcpm_addr; /* address associated */
167 __u16 __tcpm_pad1; 167 __u16 __tcpm_pad1; /* zero */
168 __u16 tcpm_keylen; 168 __u16 tcpm_keylen; /* key length */
169 __u32 __tcpm_pad2; 169 __u32 __tcpm_pad2; /* zero */
170 __u8 tcpm_key[TCP_MD5SIG_MAXKEYLEN] 170 __u8 tcpm_key[TCP_MD5SIG_MAXKEYLEN]; /* key (binary) */
171 }; 171 };
172 172
173 #ifdef __KERNEL__ 173 #ifdef __KERNEL__
174 174
175 #include <linux/skbuff.h> 175 #include <linux/skbuff.h>
176 #include <linux/dmaengine.h> 176 #include <linux/dmaengine.h>
177 #include <net/sock.h> 177 #include <net/sock.h>
178 #include <net/inet_connection_sock.h> 178 #include <net/inet_connection_sock.h>
179 #include <net/inet_timewait_sock.h> 179 #include <net/inet_timewait_sock.h>
180 180
181 static inline struct tcphdr *tcp_hdr(const str 181 static inline struct tcphdr *tcp_hdr(const struct sk_buff *skb)
182 { 182 {
183 return (struct tcphdr *)skb_transport_ 183 return (struct tcphdr *)skb_transport_header(skb);
184 } 184 }
185 185
186 static inline unsigned int tcp_hdrlen(const st 186 static inline unsigned int tcp_hdrlen(const struct sk_buff *skb)
187 { 187 {
188 return tcp_hdr(skb)->doff * 4; 188 return tcp_hdr(skb)->doff * 4;
189 } 189 }
190 190
191 static inline unsigned int tcp_optlen(const st 191 static inline unsigned int tcp_optlen(const struct sk_buff *skb)
192 { 192 {
193 return (tcp_hdr(skb)->doff - 5) * 4; 193 return (tcp_hdr(skb)->doff - 5) * 4;
194 } 194 }
195 195
196 /* This defines a selective acknowledgement bl 196 /* This defines a selective acknowledgement block. */
197 struct tcp_sack_block_wire { 197 struct tcp_sack_block_wire {
198 __be32 start_seq; 198 __be32 start_seq;
199 __be32 end_seq; 199 __be32 end_seq;
200 }; 200 };
201 201
202 struct tcp_sack_block { 202 struct tcp_sack_block {
203 u32 start_seq; 203 u32 start_seq;
204 u32 end_seq; 204 u32 end_seq;
205 }; 205 };
206 206
207 struct tcp_options_received { 207 struct tcp_options_received {
208 /* PAWS/RTTM data */ 208 /* PAWS/RTTM data */
209 long ts_recent_stamp;/* Time we sto 209 long ts_recent_stamp;/* Time we stored ts_recent (for aging) */
210 u32 ts_recent; /* Time stamp 210 u32 ts_recent; /* Time stamp to echo next */
211 u32 rcv_tsval; /* Time stamp 211 u32 rcv_tsval; /* Time stamp value */
212 u32 rcv_tsecr; /* Time stamp 212 u32 rcv_tsecr; /* Time stamp echo reply */
213 u16 saw_tstamp : 1, /* Saw TIMESTA 213 u16 saw_tstamp : 1, /* Saw TIMESTAMP on last packet */
214 tstamp_ok : 1, /* TIMESTAMP s 214 tstamp_ok : 1, /* TIMESTAMP seen on SYN packet */
215 dsack : 1, /* D-SACK is s 215 dsack : 1, /* D-SACK is scheduled */
216 wscale_ok : 1, /* Wscale seen 216 wscale_ok : 1, /* Wscale seen on SYN packet */
217 sack_ok : 4, /* SACK seen o 217 sack_ok : 4, /* SACK seen on SYN packet */
218 snd_wscale : 4, /* Window scal 218 snd_wscale : 4, /* Window scaling received from sender */
219 rcv_wscale : 4; /* Window scal 219 rcv_wscale : 4; /* Window scaling to send to receiver */
220 /* SACKs data */ 220 /* SACKs data */
221 u8 eff_sacks; /* Size of SAC <<
222 u8 num_sacks; /* Number of S 221 u8 num_sacks; /* Number of SACK blocks */
223 u16 user_mss; /* mss request 222 u16 user_mss; /* mss requested by user in ioctl */
224 u16 mss_clamp; /* Maximal mss 223 u16 mss_clamp; /* Maximal mss, negotiated at connection setup */
225 }; 224 };
226 225
>> 226 /* This is the max number of SACKS that we'll generate and process. It's safe
>> 227 * to increse this, although since:
>> 228 * size = TCPOLEN_SACK_BASE_ALIGNED (4) + n * TCPOLEN_SACK_PERBLOCK (8)
>> 229 * only four options will fit in a standard TCP header */
>> 230 #define TCP_NUM_SACKS 4
>> 231
227 struct tcp_request_sock { 232 struct tcp_request_sock {
228 struct inet_request_sock req; 233 struct inet_request_sock req;
229 #ifdef CONFIG_TCP_MD5SIG 234 #ifdef CONFIG_TCP_MD5SIG
230 /* Only used by TCP MD5 Signature so f 235 /* Only used by TCP MD5 Signature so far. */
231 struct tcp_request_sock_ops *af_sp 236 struct tcp_request_sock_ops *af_specific;
232 #endif 237 #endif
233 u32 rcv_is 238 u32 rcv_isn;
234 u32 snt_is 239 u32 snt_isn;
235 }; 240 };
236 241
237 static inline struct tcp_request_sock *tcp_rsk 242 static inline struct tcp_request_sock *tcp_rsk(const struct request_sock *req)
238 { 243 {
239 return (struct tcp_request_sock *)req; 244 return (struct tcp_request_sock *)req;
240 } 245 }
241 246
242 struct tcp_sock { 247 struct tcp_sock {
243 /* inet_connection_sock has to be the 248 /* inet_connection_sock has to be the first member of tcp_sock */
244 struct inet_connection_sock inet_c 249 struct inet_connection_sock inet_conn;
245 u16 tcp_header_len; /* Bytes of tc 250 u16 tcp_header_len; /* Bytes of tcp header to send */
246 u16 xmit_size_goal; /* Goal for se !! 251 u16 xmit_size_goal_segs; /* Goal for segmenting output packets */
247 252
248 /* 253 /*
249 * Header prediction flags 254 * Header prediction flags
250 * 0x5?10 << 16 + snd_wnd in net byte ord 255 * 0x5?10 << 16 + snd_wnd in net byte order
251 */ 256 */
252 __be32 pred_flags; 257 __be32 pred_flags;
253 258
254 /* 259 /*
255 * RFC793 variables by their proper names 260 * RFC793 variables by their proper names. This means you can
256 * read the code and the spec side by sid 261 * read the code and the spec side by side (and laugh ...)
257 * See RFC793 and RFC1122. The RFC writes 262 * See RFC793 and RFC1122. The RFC writes these in capitals.
258 */ 263 */
259 u32 rcv_nxt; /* What we wan 264 u32 rcv_nxt; /* What we want to receive next */
260 u32 copied_seq; /* Head of yet 265 u32 copied_seq; /* Head of yet unread data */
261 u32 rcv_wup; /* rcv_nxt on 266 u32 rcv_wup; /* rcv_nxt on last window update sent */
262 u32 snd_nxt; /* Next sequen 267 u32 snd_nxt; /* Next sequence we send */
263 268
264 u32 snd_una; /* First byte 269 u32 snd_una; /* First byte we want an ack for */
265 u32 snd_sml; /* Last byte o 270 u32 snd_sml; /* Last byte of the most recently transmitted small packet */
266 u32 rcv_tstamp; /* timestamp o 271 u32 rcv_tstamp; /* timestamp of last received ACK (for keepalives) */
267 u32 lsndtime; /* timestamp o 272 u32 lsndtime; /* timestamp of last sent data packet (for restart window) */
268 273
269 /* Data for direct copy to user */ 274 /* Data for direct copy to user */
270 struct { 275 struct {
271 struct sk_buff_head preque 276 struct sk_buff_head prequeue;
272 struct task_struct *task; 277 struct task_struct *task;
273 struct iovec *iov; 278 struct iovec *iov;
274 int memory 279 int memory;
275 int len; 280 int len;
276 #ifdef CONFIG_NET_DMA 281 #ifdef CONFIG_NET_DMA
277 /* members for async copy */ 282 /* members for async copy */
278 struct dma_chan *dma_c 283 struct dma_chan *dma_chan;
279 int wakeup 284 int wakeup;
280 struct dma_pinned_list *pinne 285 struct dma_pinned_list *pinned_list;
281 dma_cookie_t dma_co 286 dma_cookie_t dma_cookie;
282 #endif 287 #endif
283 } ucopy; 288 } ucopy;
284 289
285 u32 snd_wl1; /* Sequence fo 290 u32 snd_wl1; /* Sequence for window update */
286 u32 snd_wnd; /* The window 291 u32 snd_wnd; /* The window we expect to receive */
287 u32 max_window; /* Maximal win 292 u32 max_window; /* Maximal window ever seen from peer */
288 u32 mss_cache; /* Cached effe 293 u32 mss_cache; /* Cached effective mss, not including SACKS */
289 294
290 u32 window_clamp; /* Maximal win 295 u32 window_clamp; /* Maximal window to advertise */
291 u32 rcv_ssthresh; /* Current win 296 u32 rcv_ssthresh; /* Current window clamp */
292 297
293 u32 frto_highmark; /* snd_nxt whe 298 u32 frto_highmark; /* snd_nxt when RTO occurred */
294 u8 reordering; /* Packet reor !! 299 u16 advmss; /* Advertised MSS */
295 u8 frto_counter; /* Number of n 300 u8 frto_counter; /* Number of new acks after RTO */
296 u8 nonagle; /* Disable Nag 301 u8 nonagle; /* Disable Nagle algorithm? */
297 u8 keepalive_probes; /* num of al <<
298 302
299 /* RTT measurement */ 303 /* RTT measurement */
300 u32 srtt; /* smoothed ro 304 u32 srtt; /* smoothed round trip time << 3 */
301 u32 mdev; /* medium devi 305 u32 mdev; /* medium deviation */
302 u32 mdev_max; /* maximal mde 306 u32 mdev_max; /* maximal mdev for the last rtt period */
303 u32 rttvar; /* smoothed md 307 u32 rttvar; /* smoothed mdev_max */
304 u32 rtt_seq; /* sequence nu 308 u32 rtt_seq; /* sequence number to update rttvar */
305 309
306 u32 packets_out; /* Packets whi 310 u32 packets_out; /* Packets which are "in flight" */
307 u32 retrans_out; /* Retransmitt 311 u32 retrans_out; /* Retransmitted packets out */
>> 312
>> 313 u16 urg_data; /* Saved octet of OOB data and control flags */
>> 314 u8 ecn_flags; /* ECN status bits. */
>> 315 u8 reordering; /* Packet reordering metric. */
>> 316 u32 snd_up; /* Urgent pointer */
>> 317
>> 318 u8 keepalive_probes; /* num of allowed keep alive probes */
308 /* 319 /*
309 * Options received (usually on last pack 320 * Options received (usually on last packet, some only on SYN packets).
310 */ 321 */
311 struct tcp_options_received rx_opt; 322 struct tcp_options_received rx_opt;
312 323
313 /* 324 /*
314 * Slow start and congestion control (see 325 * Slow start and congestion control (see also Nagle, and Karn & Partridge)
315 */ 326 */
316 u32 snd_ssthresh; /* Slow start 327 u32 snd_ssthresh; /* Slow start size threshold */
317 u32 snd_cwnd; /* Sending con 328 u32 snd_cwnd; /* Sending congestion window */
318 u32 snd_cwnd_cnt; /* Linear incr 329 u32 snd_cwnd_cnt; /* Linear increase counter */
319 u32 snd_cwnd_clamp; /* Do not allo 330 u32 snd_cwnd_clamp; /* Do not allow snd_cwnd to grow above this */
320 u32 snd_cwnd_used; 331 u32 snd_cwnd_used;
321 u32 snd_cwnd_stamp; 332 u32 snd_cwnd_stamp;
322 333
323 struct sk_buff_head out_of_order_q <<
324 <<
325 u32 rcv_wnd; /* Current rec 334 u32 rcv_wnd; /* Current receiver window */
326 u32 write_seq; /* Tail(+1) of 335 u32 write_seq; /* Tail(+1) of data held in tcp send buffer */
327 u32 pushed_seq; /* Last pushed 336 u32 pushed_seq; /* Last pushed seq, required to talk to windows */
>> 337 u32 lost_out; /* Lost packets */
>> 338 u32 sacked_out; /* SACK'd packets */
>> 339 u32 fackets_out; /* FACK'd packets */
>> 340 u32 tso_deferred;
>> 341 u32 bytes_acked; /* Appropriate Byte Counting - RFC3465 */
328 342
329 /* SACKs data */ !! 343 /* from STCP, retrans queue hinting */
>> 344 struct sk_buff* lost_skb_hint;
>> 345 struct sk_buff *scoreboard_skb_hint;
>> 346 struct sk_buff *retransmit_skb_hint;
>> 347
>> 348 struct sk_buff_head out_of_order_queue; /* Out of order segments go here */
>> 349
>> 350 /* SACKs data, these 2 need to be together (see tcp_build_and_update_options) */
330 struct tcp_sack_block duplicate_sack[1 351 struct tcp_sack_block duplicate_sack[1]; /* D-SACK block */
331 struct tcp_sack_block selective_acks[4 352 struct tcp_sack_block selective_acks[4]; /* The SACKS themselves*/
332 353
333 struct tcp_sack_block recv_sack_cache[ 354 struct tcp_sack_block recv_sack_cache[4];
334 355
335 struct sk_buff *highest_sack; /* hig 356 struct sk_buff *highest_sack; /* highest skb with SACK received
336 * (va 357 * (validity guaranteed only if
337 * sac 358 * sacked_out > 0)
338 */ 359 */
339 360
340 /* from STCP, retrans queue hinting */ <<
341 struct sk_buff* lost_skb_hint; <<
342 <<
343 struct sk_buff *scoreboard_skb_hint; <<
344 struct sk_buff *retransmit_skb_hint; <<
345 struct sk_buff *forward_skb_hint; <<
346 <<
347 int lost_cnt_hint; 361 int lost_cnt_hint;
348 int retransmit_cnt_hint; !! 362 u32 retransmit_high; /* L-bits may be on up to this seqno */
349 363
350 u32 lost_retrans_low; /* Sen 364 u32 lost_retrans_low; /* Sent seq after any rxmit (lowest) */
351 365
352 u16 advmss; /* Advertised !! 366 u32 prior_ssthresh; /* ssthresh saved at recovery start */
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 367 u32 high_seq; /* snd_nxt at onset of congestion */
358 368
359 u32 retrans_stamp; /* Timestamp o 369 u32 retrans_stamp; /* Timestamp of the last retransmit,
360 * also used i 370 * also used in SYN-SENT to remember stamp of
361 * the first S 371 * the first SYN. */
362 u32 undo_marker; /* tracking re 372 u32 undo_marker; /* tracking retrans started here. */
363 int undo_retrans; /* number of u 373 int undo_retrans; /* number of undoable retransmissions. */
364 u32 urg_seq; /* Seq of rece <<
365 u16 urg_data; /* Saved octet <<
366 u8 urg_mode; /* In urgent m <<
367 u8 ecn_flags; /* ECN status <<
368 u32 snd_up; /* Urgent poin <<
369 <<
370 u32 total_retrans; /* Total retra 374 u32 total_retrans; /* Total retransmits for entire connection */
371 u32 bytes_acked; /* Appropriate <<
372 375
>> 376 u32 urg_seq; /* Seq of received urgent pointer */
373 unsigned int keepalive_time 377 unsigned int keepalive_time; /* time before keep alive takes place */
374 unsigned int keepalive_intv 378 unsigned int keepalive_intvl; /* time interval between keep alive probes */
375 int linger2; <<
376 <<
377 unsigned long last_synq_overflow; <<
378 379
379 u32 tso_deferred; !! 380 int linger2;
380 381
381 /* Receiver side RTT estimation */ 382 /* Receiver side RTT estimation */
382 struct { 383 struct {
383 u32 rtt; 384 u32 rtt;
384 u32 seq; 385 u32 seq;
385 u32 time; 386 u32 time;
386 } rcv_rtt_est; 387 } rcv_rtt_est;
387 388
388 /* Receiver queue space */ 389 /* Receiver queue space */
389 struct { 390 struct {
390 int space; 391 int space;
391 u32 seq; 392 u32 seq;
392 u32 time; 393 u32 time;
393 } rcvq_space; 394 } rcvq_space;
394 395
395 /* TCP-specific MTU probe information. */ 396 /* TCP-specific MTU probe information. */
396 struct { 397 struct {
397 u32 probe_seq_st 398 u32 probe_seq_start;
398 u32 probe_seq_en 399 u32 probe_seq_end;
399 } mtu_probe; 400 } mtu_probe;
400 401
401 #ifdef CONFIG_TCP_MD5SIG 402 #ifdef CONFIG_TCP_MD5SIG
402 /* TCP AF-Specific parts; only used by MD5 Sig 403 /* TCP AF-Specific parts; only used by MD5 Signature support so far */
403 struct tcp_sock_af_ops *af_specific; 404 struct tcp_sock_af_ops *af_specific;
404 405
405 /* TCP MD5 Signagure Option information */ 406 /* TCP MD5 Signagure Option information */
406 struct tcp_md5sig_info *md5sig_info; 407 struct tcp_md5sig_info *md5sig_info;
407 #endif 408 #endif
408 }; 409 };
409 410
410 static inline struct tcp_sock *tcp_sk(const st 411 static inline struct tcp_sock *tcp_sk(const struct sock *sk)
411 { 412 {
412 return (struct tcp_sock *)sk; 413 return (struct tcp_sock *)sk;
413 } 414 }
414 415
415 struct tcp_timewait_sock { 416 struct tcp_timewait_sock {
416 struct inet_timewait_sock tw_sk; 417 struct inet_timewait_sock tw_sk;
417 u32 tw_rcv_nxt; 418 u32 tw_rcv_nxt;
418 u32 tw_snd_nxt; 419 u32 tw_snd_nxt;
419 u32 tw_rcv_wnd; 420 u32 tw_rcv_wnd;
420 u32 tw_ts_recent 421 u32 tw_ts_recent;
421 long tw_ts_recent 422 long tw_ts_recent_stamp;
422 #ifdef CONFIG_TCP_MD5SIG 423 #ifdef CONFIG_TCP_MD5SIG
423 u16 tw_md5_keyle 424 u16 tw_md5_keylen;
424 u8 tw_md5_key[T 425 u8 tw_md5_key[TCP_MD5SIG_MAXKEYLEN];
425 #endif 426 #endif
426 }; 427 };
427 428
428 static inline struct tcp_timewait_sock *tcp_tw 429 static inline struct tcp_timewait_sock *tcp_twsk(const struct sock *sk)
429 { 430 {
430 return (struct tcp_timewait_sock *)sk; 431 return (struct tcp_timewait_sock *)sk;
431 } 432 }
432 433
433 #endif 434 #endif
434 435
435 #endif /* _LINUX_TCP_H */ 436 #endif /* _LINUX_TCP_H */
436 437
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