📄 sock.h
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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 AF_INET socket handler.
7 *
8 * Version: @(#)sock.h 1.0.4 05/13/93
9 *
10 * Authors: Ross Biro, <bir7@leland.Stanford.Edu>
11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Corey Minyard <wf-rch!minyard@relay.EU.net>
13 * Florian La Roche <flla@stud.uni-sb.de>
14 *
15 * Fixes:
16 * Alan Cox : Volatiles in skbuff pointers. See
17 * skbuff comments. May be overdone,
18 * better to prove they can be removed
19 * than the reverse.
20 * Alan Cox : Added a zapped field for tcp to note
21 * a socket is reset and must stay shut up
22 * Alan Cox : New fields for options
23 * Pauline Middelink : identd support
24 *
25 * This program is free software; you can redistribute it and/or
26 * modify it under the terms of the GNU General Public License
27 * as published by the Free Software Foundation; either version
28 * 2 of the License, or (at your option) any later version.
29 */
30 #ifndef _SOCK_H
31 #define _SOCK_H
32
33 #include <linux/timer.h>
34 #include <linux/ip.h> /* struct options */
35 #include <linux/tcp.h> /* struct tcphdr */
36
37 #include "skbuff.h" /* struct sk_buff */
38 #include "protocol.h" /* struct inet_protocol */
39 #ifdef CONFIG_AX25
40 #include "ax25.h"
41 #endif
42 #ifdef CONFIG_IPX
43 #include "ipx.h"
44 #endif
45
46 #define SOCK_ARRAY_SIZE 64
47
48
49 /*
50 * This structure really needs to be cleaned up.
51 * Most of it is for TCP, and not used by any of
52 * the other protocols.
53 */
54 struct sock {
55 struct options *opt;
56 volatile unsigned long wmem_alloc;
57 volatile unsigned long rmem_alloc;
58 unsigned long write_seq;
59 unsigned long sent_seq;
60 unsigned long acked_seq;
61 unsigned long copied_seq;
62 unsigned long rcv_ack_seq;
63 unsigned long window_seq;
64 unsigned long fin_seq;
65 unsigned long urg_seq;
66 unsigned long urg_data;
67
68 /*
69 * Not all are volatile, but some are, so we
70 * might as well say they all are.
71 */
72 volatile char inuse,
73 dead,
74 urginline,
75 intr,
76 blog,
77 done,
78 reuse,
79 keepopen,
80 linger,
81 delay_acks,
82 destroy,
83 ack_timed,
84 no_check,
85 zapped, /* In ax25 & ipx means not linked */
86 broadcast,
87 nonagle;
88 unsigned long lingertime;
89 int proc;
90 struct sock *next;
91 struct sock *pair;
92 struct sk_buff *volatile send_tail;
93 struct sk_buff *volatile send_head;
94 struct sk_buff *volatile back_log;
95 struct sk_buff *partial;
96 struct timer_list partial_timer;
97 long retransmits;
98 struct sk_buff *volatile wback,
99 *volatile wfront,
100 *volatile rqueue;
101 struct proto *prot;
102 struct wait_queue **sleep;
103 unsigned long daddr;
104 unsigned long saddr;
105 unsigned short max_unacked;
106 unsigned short window;
107 unsigned short bytes_rcv;
108 /* mss is min(mtu, max_window) */
109 unsigned short mtu; /* mss negotiated in the syn's */
110 volatile unsigned short mss; /* current eff. mss - can change */
111 volatile unsigned short user_mss; /* mss requested by user in ioctl */
112 volatile unsigned short max_window;
113 unsigned short num;
114 volatile unsigned short cong_window;
115 volatile unsigned short cong_count;
116 volatile unsigned short ssthresh;
117 volatile unsigned short packets_out;
118 volatile unsigned short shutdown;
119 volatile unsigned long rtt;
120 volatile unsigned long mdev;
121 volatile unsigned long rto;
122 /* currently backoff isn't used, but I'm maintaining it in case
123 * we want to go back to a backoff formula that needs it
124 */
125 volatile unsigned short backoff;
126 volatile short err;
127 unsigned char protocol;
128 volatile unsigned char state;
129 volatile unsigned char ack_backlog;
130 unsigned char max_ack_backlog;
131 unsigned char priority;
132 unsigned char debug;
133 unsigned short rcvbuf;
134 unsigned short sndbuf;
135 unsigned short type;
136 #ifdef CONFIG_IPX
137 ipx_address ipx_source_addr,ipx_dest_addr;
138 unsigned short ipx_type;
139 #endif
140 #ifdef CONFIG_AX25
141 /* Really we want to add a per protocol private area */
142 ax25_address ax25_source_addr,ax25_dest_addr;
143 struct sk_buff *volatile ax25_retxq[8];
144 char ax25_state,ax25_vs,ax25_vr,ax25_lastrxnr,ax25_lasttxnr;
145 char ax25_condition;
146 char ax25_retxcnt;
147 char ax25_xx;
148 char ax25_retxqi;
149 char ax25_rrtimer;
150 char ax25_timer;
151 ax25_digi *ax25_digipeat;
152 #endif
153 /* IP 'private area' or will be eventually */
154 int ip_ttl; /* TTL setting */
155 int ip_tos; /* TOS */
156 struct tcphdr dummy_th;
157
158 /* This part is used for the timeout functions (timer.c). */
159 int timeout; /* What are we waiting for? */
160 struct timer_list timer;
161
162 /* identd */
163 struct socket *socket;
164
165 /* Callbacks */
166 void (*state_change)(struct sock *sk);
167 void (*data_ready)(struct sock *sk,int bytes);
168 void (*write_space)(struct sock *sk);
169 void (*error_report)(struct sock *sk);
170
171 };
172
173 struct proto {
174 struct sk_buff * (*wmalloc)(struct sock *sk,
175 unsigned long size, int force,
176 int priority);
177 struct sk_buff * (*rmalloc)(struct sock *sk,
178 unsigned long size, int force,
179 int priority);
180 void (*wfree)(struct sock *sk, void *mem,
181 unsigned long size);
182 void (*rfree)(struct sock *sk, void *mem,
183 unsigned long size);
184 unsigned long (*rspace)(struct sock *sk);
185 unsigned long (*wspace)(struct sock *sk);
186 void (*close)(struct sock *sk, int timeout);
187 int (*read)(struct sock *sk, unsigned char *to,
188 int len, int nonblock, unsigned flags);
189 int (*write)(struct sock *sk, unsigned char *to,
190 int len, int nonblock, unsigned flags);
191 int (*sendto)(struct sock *sk,
192 unsigned char *from, int len, int noblock,
193 unsigned flags, struct sockaddr_in *usin,
194 int addr_len);
195 int (*recvfrom)(struct sock *sk,
196 unsigned char *from, int len, int noblock,
197 unsigned flags, struct sockaddr_in *usin,
198 int *addr_len);
199 int (*build_header)(struct sk_buff *skb,
200 unsigned long saddr,
201 unsigned long daddr,
202 struct device **dev, int type,
203 struct options *opt, int len, int tos, int ttl);
204 int (*connect)(struct sock *sk,
205 struct sockaddr_in *usin, int addr_len);
206 struct sock * (*accept) (struct sock *sk, int flags);
207 void (*queue_xmit)(struct sock *sk,
208 struct device *dev, struct sk_buff *skb,
209 int free);
210 void (*retransmit)(struct sock *sk, int all);
211 void (*write_wakeup)(struct sock *sk);
212 void (*read_wakeup)(struct sock *sk);
213 int (*rcv)(struct sk_buff *buff, struct device *dev,
214 struct options *opt, unsigned long daddr,
215 unsigned short len, unsigned long saddr,
216 int redo, struct inet_protocol *protocol);
217 int (*select)(struct sock *sk, int which,
218 select_table *wait);
219 int (*ioctl)(struct sock *sk, int cmd,
220 unsigned long arg);
221 int (*init)(struct sock *sk);
222 void (*shutdown)(struct sock *sk, int how);
223 int (*setsockopt)(struct sock *sk, int level, int optname,
224 char *optval, int optlen);
225 int (*getsockopt)(struct sock *sk, int level, int optname,
226 char *optval, int *option);
227 unsigned short max_header;
228 unsigned long retransmits;
229 struct sock * sock_array[SOCK_ARRAY_SIZE];
230 char name[80];
231 };
232
233 #define TIME_WRITE 1
234 #define TIME_CLOSE 2
235 #define TIME_KEEPOPEN 3
236 #define TIME_DESTROY 4
237 #define TIME_DONE 5 /* used to absorb those last few packets */
238 #define TIME_PROBE0 6
239 #define SOCK_DESTROY_TIME 1000 /* about 10 seconds */
240
241 #define PROT_SOCK 1024 /* Sockets 0-1023 can't be bound too unless you are superuser */
242
243 #define SHUTDOWN_MASK 3
244 #define RCV_SHUTDOWN 1
245 #define SEND_SHUTDOWN 2
246
247
248 extern void destroy_sock(struct sock *sk);
249 extern unsigned short get_new_socknum(struct proto *, unsigned short);
250 extern void put_sock(unsigned short, struct sock *);
251 extern void release_sock(struct sock *sk);
252 extern struct sock *get_sock(struct proto *, unsigned short,
253 unsigned long, unsigned short,
254 unsigned long);
255 extern void print_sk(struct sock *);
256 extern struct sk_buff *sock_wmalloc(struct sock *sk,
257 unsigned long size, int force,
258 int priority);
259 extern struct sk_buff *sock_rmalloc(struct sock *sk,
260 unsigned long size, int force,
261 int priority);
262 extern void sock_wfree(struct sock *sk, void *mem,
263 unsigned long size);
264 extern void sock_rfree(struct sock *sk, void *mem,
265 unsigned long size);
266 extern unsigned long sock_rspace(struct sock *sk);
267 extern unsigned long sock_wspace(struct sock *sk);
268
269 extern int sock_setsockopt(struct sock *sk,int level,int op,char *optval,int optlen);
270 extern int sock_getsockopt(struct sock *sk,int level,int op,char *optval,int *optlen);
271
272 /* declarations from timer.c */
273 extern struct sock *timer_base;
274
275 void delete_timer (struct sock *);
276 void reset_timer (struct sock *, int, unsigned long);
277 void net_timer (unsigned long);
278
279
280 #endif /* _SOCK_H */
281
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