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1.1 root 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, <[email protected]>
11: * Fred N. van Kempen, <[email protected]>
12: * Corey Minyard <[email protected]>
13: * Florian La Roche <[email protected]>
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: * Alan Cox : Eliminate low level recv/recvfrom
25: * David S. Miller : New socket lookup architecture for ISS.
26: * Elliot Poger : New field for SO_BINDTODEVICE option.
27: *
28: * This program is free software; you can redistribute it and/or
29: * modify it under the terms of the GNU General Public License
30: * as published by the Free Software Foundation; either version
31: * 2 of the License, or (at your option) any later version.
32: */
33: #ifndef _SOCK_H
34: #define _SOCK_H
35:
36: #include <linux/timer.h>
37: #include <linux/ip.h> /* struct options */
38: #include <linux/in.h> /* struct sockaddr_in */
39: #include <linux/tcp.h> /* struct tcphdr */
40: #include <linux/config.h>
41:
42: #include <linux/netdevice.h>
43: #include <linux/skbuff.h> /* struct sk_buff */
44: #include <net/protocol.h> /* struct inet_protocol */
45: #if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
46: #include <net/ax25.h>
47: #if defined(CONFIG_NETROM) || defined(CONFIG_NETROM_MODULE)
48: #include <net/netrom.h>
49: #endif
50: #if defined(CONFIG_ROSE) || defined(CONFIG_ROSE_MODULE)
51: #include <net/rose.h>
52: #endif
53: #endif
54:
55: #if defined(CONFIG_IPX) || defined(CONFIG_IPX_MODULE)
56: #include <net/ipx.h>
57: #endif
58:
59: #if defined(CONFIG_ATALK) || defined(CONFIG_ATALK_MODULE)
60: #include <linux/atalk.h>
61: #endif
62:
63: #include <linux/igmp.h>
64:
65: #include <asm/atomic.h>
66:
67: /*
68: * The AF_UNIX specific socket options
69: */
70:
71: struct unix_opt
72: {
73: int family;
74: char * name;
75: int locks;
76: struct inode * inode;
77: struct semaphore readsem;
78: struct sock * other;
79: int marksweep;
80: #define MARKED 1
81: int inflight;
82: };
83:
84: /*
85: * IP packet socket options
86: */
87:
88: struct inet_packet_opt
89: {
90: struct notifier_block notifier; /* Used when bound */
91: struct device *bound_dev;
92: unsigned long dev_stamp;
93: struct packet_type *prot_hook;
94: char device_name[15];
95: };
96:
97: /*
98: * Once the IPX ncpd patches are in these are going into protinfo
99: */
100:
101: #if defined(CONFIG_IPX) || defined(CONFIG_IPX_MODULE)
102: struct ipx_opt
103: {
104: ipx_address dest_addr;
105: ipx_interface *intrfc;
106: unsigned short port;
107: #ifdef CONFIG_IPX_INTERN
108: unsigned char node[IPX_NODE_LEN];
109: #endif
110: unsigned short type;
111: /*
112: * To handle asynchronous messages from the NetWare server, we have to
113: * know the connection this socket belongs to.
114: */
115: struct ncp_server *ncp_server;
116: /*
117: * To handle special ncp connection-handling sockets for mars_nwe,
118: * the connection number must be stored in the socket.
119: */
120: unsigned short ipx_ncp_conn;
121: };
122: #endif
123:
124: #ifdef CONFIG_NUTCP
125: struct tcp_opt
126: {
127: /*
128: * RFC793 variables by their proper names. This means you can
129: * read the code and the spec side by side (and laugh ...)
130: * See RFC793 and RFC1122. The RFC writes these in capitals.
131: */
132: __u32 rcv_nxt; /* What we want to receive next */
133: __u32 rcv_up; /* The urgent point (may not be valid) */
134: __u32 rcv_wnd; /* Current receiver window */
135: __u32 snd_nxt; /* Next sequence we send */
136: __u32 snd_una; /* First byte we want an ack for */
137: __u32 snd_up; /* Outgoing urgent pointer */
138: __u32 snd_wl1; /* Sequence for window update */
139: __u32 snd_wl2; /* Ack sequence for update */
140: /*
141: * Slow start and congestion control (see also Nagle, and Karn & Partridge)
142: */
143: __u32 snd_cwnd; /* Sending congestion window */
144: __u32 snd_ssthresh; /* Slow start size threshold */
145: /*
146: * Timers used by the TCP protocol layer
147: */
148: struct timer_list delack_timer; /* Ack delay */
149: struct timer_list idle_timer; /* Idle watch */
150: struct timer_list completion_timer; /* Up/Down timer */
151: struct timer_list probe_timer; /* Probes */
152: struct timer_list retransmit_timer; /* Resend (no ack) */
153: };
154: #endif
155:
156: /*
157: * This structure really needs to be cleaned up.
158: * Most of it is for TCP, and not used by any of
159: * the other protocols.
160: */
161: struct sock
162: {
163: /* This must be first. */
164: struct sock *sklist_next;
165: struct sock *sklist_prev;
166:
167: struct options *opt;
168: atomic_t wmem_alloc;
169: atomic_t rmem_alloc;
170: unsigned long allocation; /* Allocation mode */
171: __u32 write_seq;
172: __u32 sent_seq;
173: __u32 acked_seq;
174: __u32 copied_seq;
175: __u32 rcv_ack_seq;
176: unsigned short rcv_ack_cnt; /* count of same ack */
177: __u32 window_seq;
178: __u32 fin_seq;
179: __u32 urg_seq;
180: __u32 urg_data;
181: __u32 syn_seq;
182: int users; /* user count */
183: /*
184: * Not all are volatile, but some are, so we
185: * might as well say they all are.
186: */
187: volatile char dead,
188: urginline,
189: intr,
190: blog,
191: done,
192: reuse,
193: keepopen,
194: linger,
195: delay_acks,
196: destroy,
197: ack_timed,
198: no_check,
199: zapped, /* In ax25 & ipx means not linked */
200: broadcast,
201: nonagle,
202: bsdism;
203: struct device * bound_device;
204: unsigned long lingertime;
205: int proc;
206:
207: struct sock *next;
208: struct sock **pprev;
209: struct sock *bind_next;
210: struct sock **bind_pprev;
211: struct sock *pair;
212: int hashent;
213: struct sock *prev;
214: struct sk_buff * volatile send_head;
215: struct sk_buff * volatile send_next;
216: struct sk_buff * volatile send_tail;
217: struct sk_buff_head back_log;
218: struct sk_buff *partial;
219: struct timer_list partial_timer;
220: long retransmits;
221: struct sk_buff_head write_queue,
222: receive_queue;
223: struct proto *prot;
224: struct wait_queue **sleep;
225: __u32 daddr;
226: __u32 saddr; /* Sending source */
227: __u32 rcv_saddr; /* Bound address */
228: unsigned short max_unacked;
229: unsigned short window;
230: __u32 lastwin_seq; /* sequence number when we last updated the window we offer */
231: __u32 high_seq; /* sequence number when we did current fast retransmit */
232: volatile unsigned long ato; /* ack timeout */
233: volatile unsigned long lrcvtime; /* jiffies at last data rcv */
234: volatile unsigned long idletime; /* jiffies at last rcv */
235: unsigned int bytes_rcv;
236: /*
237: * mss is min(mtu, max_window)
238: */
239: unsigned short mtu; /* mss negotiated in the syn's */
240: volatile unsigned short mss; /* current eff. mss - can change */
241: volatile unsigned short user_mss; /* mss requested by user in ioctl */
242: volatile unsigned short max_window;
243: unsigned long window_clamp;
244: unsigned int ssthresh;
245: unsigned short num;
246: volatile unsigned short cong_window;
247: volatile unsigned short cong_count;
248: volatile unsigned short packets_out;
249: volatile unsigned short shutdown;
250: volatile unsigned long rtt;
251: volatile unsigned long mdev;
252: volatile unsigned long rto;
253:
254: /*
255: * currently backoff isn't used, but I'm maintaining it in case
256: * we want to go back to a backoff formula that needs it
257: */
258:
259: volatile unsigned short backoff;
260: int err, err_soft; /* Soft holds errors that don't
261: cause failure but are the cause
262: of a persistent failure not just
263: 'timed out' */
264: unsigned char protocol;
265: volatile unsigned char state;
266: unsigned short ack_backlog;
267: unsigned char priority;
268: unsigned char debug;
269: int rcvbuf;
270: int sndbuf;
271: unsigned short type;
272: unsigned char localroute; /* Route locally only */
273:
274: /*
275: * This is where all the private (optional) areas that don't
276: * overlap will eventually live.
277: */
278:
279: union
280: {
281: struct unix_opt af_unix;
282: #if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
283: ax25_cb *ax25;
284: #if defined(CONFIG_NETROM) || defined(CONFIG_NETROM_MODULE)
285: nr_cb *nr;
286: #endif
287: #if defined(CONFIG_ROSE) || defined(CONFIG_ROSE_MODULE)
288: rose_cb *rose;
289: #endif
290: #endif
291: #if defined(CONFIG_ATALK) || defined(CONFIG_ATALK_MODULE)
292: struct atalk_sock af_at;
293: #endif
294: #if defined(CONFIG_IPX) || defined(CONFIG_IPX_MODULE)
295: struct ipx_opt af_ipx;
296: #endif
297: #ifdef CONFIG_INET
298: struct inet_packet_opt af_packet;
299: #ifdef CONFIG_NUTCP
300: struct tcp_opt af_tcp;
301: #endif
302: #endif
303: } protinfo;
304:
305: /*
306: * IP 'private area' or will be eventually
307: */
308: int ip_ttl; /* TTL setting */
309: int ip_tos; /* TOS */
310: struct tcphdr dummy_th;
311: struct timer_list keepalive_timer; /* TCP keepalive hack */
312: struct timer_list retransmit_timer; /* TCP retransmit timer */
313: struct timer_list delack_timer; /* TCP delayed ack timer */
314: int ip_xmit_timeout; /* Why the timeout is running */
315: struct rtable *ip_route_cache; /* Cached output route */
316: unsigned char ip_hdrincl; /* Include headers ? */
317: #ifdef CONFIG_IP_MULTICAST
318: int ip_mc_ttl; /* Multicasting TTL */
319: int ip_mc_loop; /* Loopback */
320: char ip_mc_name[MAX_ADDR_LEN];/* Multicast device name */
321: struct ip_mc_socklist *ip_mc_list; /* Group array */
322: #endif
323:
324: /*
325: * This part is used for the timeout functions (timer.c).
326: */
327:
328: int timeout; /* What are we waiting for? */
329: struct timer_list timer; /* This is the TIME_WAIT/receive timer
330: * when we are doing IP
331: */
332: struct timeval stamp;
333:
334: /*
335: * Identd
336: */
337:
338: struct socket *socket;
339:
340: /*
341: * Callbacks
342: */
343:
344: void (*state_change)(struct sock *sk);
345: void (*data_ready)(struct sock *sk,int bytes);
346: void (*write_space)(struct sock *sk);
347: void (*error_report)(struct sock *sk);
348:
349: /*
350: * Moved solely for 2.0 to keep binary module compatibility stuff straight.
351: */
352:
353: unsigned short max_ack_backlog;
354: struct sock *listening;
355: };
356:
357: /*
358: * IP protocol blocks we attach to sockets.
359: */
360:
361: struct proto
362: {
363: /* These must be first. */
364: struct sock *sklist_next;
365: struct sock *sklist_prev;
366:
367: void (*close)(struct sock *sk, unsigned long timeout);
368: int (*build_header)(struct sk_buff *skb,
369: __u32 saddr,
370: __u32 daddr,
371: struct device **dev, int type,
372: struct options *opt, int len,
373: int tos, int ttl, struct rtable ** rp);
374: int (*connect)(struct sock *sk,
375: struct sockaddr_in *usin, int addr_len);
376: struct sock * (*accept) (struct sock *sk, int flags);
377: void (*queue_xmit)(struct sock *sk,
378: struct device *dev, struct sk_buff *skb,
379: int free);
380: void (*retransmit)(struct sock *sk, int all);
381: void (*write_wakeup)(struct sock *sk);
382: void (*read_wakeup)(struct sock *sk);
383: int (*rcv)(struct sk_buff *buff, struct device *dev,
384: struct options *opt, __u32 daddr,
385: unsigned short len, __u32 saddr,
386: int redo, struct inet_protocol *protocol);
387: int (*select)(struct sock *sk, int which,
388: select_table *wait);
389: int (*ioctl)(struct sock *sk, int cmd,
390: unsigned long arg);
391: int (*init)(struct sock *sk);
392: void (*shutdown)(struct sock *sk, int how);
393: int (*setsockopt)(struct sock *sk, int level, int optname,
394: char *optval, int optlen);
395: int (*getsockopt)(struct sock *sk, int level, int optname,
396: char *optval, int *option);
397: int (*sendmsg)(struct sock *sk, struct msghdr *msg, int len,
398: int noblock, int flags);
399: int (*recvmsg)(struct sock *sk, struct msghdr *msg, int len,
400: int noblock, int flags, int *addr_len);
401: int (*bind)(struct sock *sk, struct sockaddr *uaddr, int addr_len);
402:
403: /* Keeping track of sk's, looking them up, and port selection methods. */
404: void (*hash)(struct sock *sk);
405: void (*unhash)(struct sock *sk);
406: void (*rehash)(struct sock *sk);
407: unsigned short (*good_socknum)(void);
408: int (*verify_bind)(struct sock *sk, unsigned short snum);
409:
410: unsigned short max_header;
411: unsigned long retransmits;
412: char name[32];
413: int inuse, highestinuse;
414: };
415:
416: #define TIME_WRITE 1
417: #define TIME_CLOSE 2
418: #define TIME_KEEPOPEN 3
419: #define TIME_DESTROY 4
420: #define TIME_DONE 5 /* Used to absorb those last few packets */
421: #define TIME_PROBE0 6
422:
423: /*
424: * About 10 seconds
425: */
426:
427: #define SOCK_DESTROY_TIME (10*HZ)
428:
429: /*
430: * Sockets 0-1023 can't be bound to unless you are superuser
431: */
432:
433: #define PROT_SOCK 1024
434:
435: #define SHUTDOWN_MASK 3
436: #define RCV_SHUTDOWN 1
437: #define SEND_SHUTDOWN 2
438:
439: /* Per-protocol hash table implementations use this to make sure
440: * nothing changes.
441: */
442: #define SOCKHASH_LOCK() start_bh_atomic()
443: #define SOCKHASH_UNLOCK() end_bh_atomic()
444:
445: /* Some things in the kernel just want to get at a protocols
446: * entire socket list commensurate, thus...
447: */
448: static __inline__ void add_to_prot_sklist(struct sock *sk)
449: {
450: SOCKHASH_LOCK();
451: if(!sk->sklist_next) {
452: struct proto *p = sk->prot;
453:
454: sk->sklist_prev = (struct sock *) p;
455: sk->sklist_next = p->sklist_next;
456: p->sklist_next->sklist_prev = sk;
457: p->sklist_next = sk;
458:
459: /* Charge the protocol. */
460: sk->prot->inuse += 1;
461: if(sk->prot->highestinuse < sk->prot->inuse)
462: sk->prot->highestinuse = sk->prot->inuse;
463: }
464: SOCKHASH_UNLOCK();
465: }
466:
467: static __inline__ void del_from_prot_sklist(struct sock *sk)
468: {
469: SOCKHASH_LOCK();
470: if(sk->sklist_next) {
471: sk->sklist_next->sklist_prev = sk->sklist_prev;
472: sk->sklist_prev->sklist_next = sk->sklist_next;
473: sk->sklist_next = NULL;
474: sk->prot->inuse--;
475: }
476: SOCKHASH_UNLOCK();
477: }
478:
479: /*
480: * Used by processes to "lock" a socket state, so that
481: * interrupts and bottom half handlers won't change it
482: * from under us. It essentially blocks any incoming
483: * packets, so that we won't get any new data or any
484: * packets that change the state of the socket.
485: *
486: * Note the 'barrier()' calls: gcc may not move a lock
487: * "downwards" or a unlock "upwards" when optimizing.
488: */
489: extern void __release_sock(struct sock *sk);
490:
491: static inline void lock_sock(struct sock *sk)
492: {
493: #if 0
494: /* debugging code: the test isn't even 100% correct, but it can catch bugs */
495: /* Note that a double lock is ok in theory - it's just _usually_ a bug */
496: if (sk->users) {
497: __label__ here;
498: printk("double lock on socket at %p\n", &&here);
499: here:
500: }
501: #endif
502: sk->users++;
503: barrier();
504: }
505:
506: static inline void release_sock(struct sock *sk)
507: {
508: barrier();
509: #if 0
510: /* debugging code: remove me when ok */
511: if (sk->users == 0) {
512: __label__ here;
513: sk->users = 1;
514: printk("trying to unlock unlocked socket at %p\n", &&here);
515: here:
516: }
517: #endif
518: if ((sk->users = sk->users-1) == 0)
519: __release_sock(sk);
520: }
521:
522:
523: extern struct sock * sk_alloc(int priority);
524: extern void sk_free(struct sock *sk);
525: extern void destroy_sock(struct sock *sk);
526:
527: extern struct sk_buff *sock_wmalloc(struct sock *sk,
528: unsigned long size, int force,
529: int priority);
530: extern struct sk_buff *sock_rmalloc(struct sock *sk,
531: unsigned long size, int force,
532: int priority);
533: extern void sock_wfree(struct sock *sk,
534: struct sk_buff *skb);
535: extern void sock_rfree(struct sock *sk,
536: struct sk_buff *skb);
537: extern unsigned long sock_rspace(struct sock *sk);
538: extern unsigned long sock_wspace(struct sock *sk);
539:
540: extern int sock_setsockopt(struct sock *sk, int level,
541: int op, char *optval,
542: int optlen);
543:
544: extern int sock_getsockopt(struct sock *sk, int level,
545: int op, char *optval,
546: int *optlen);
547: extern struct sk_buff *sock_alloc_send_skb(struct sock *skb,
548: unsigned long size,
549: unsigned long fallback,
550: int noblock,
551: int *errcode);
552:
553: /*
554: * Queue a received datagram if it will fit. Stream and sequenced
555: * protocols can't normally use this as they need to fit buffers in
556: * and play with them.
557: *
558: * Inlined as it's very short and called for pretty much every
559: * packet ever received.
560: */
561:
1.1.1.2 ! root 562: static __inline__ int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
1.1 root 563: {
564: if (sk->rmem_alloc + skb->truesize >= sk->rcvbuf)
565: return -ENOMEM;
566: atomic_add(skb->truesize, &sk->rmem_alloc);
567: skb->sk=sk;
568: skb_queue_tail(&sk->receive_queue,skb);
569: if (!sk->dead)
570: sk->data_ready(sk,skb->len);
571: return 0;
572: }
573:
1.1.1.2 ! root 574: static __inline__ int __sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
1.1 root 575: {
576: if (sk->rmem_alloc + skb->truesize >= sk->rcvbuf)
577: return -ENOMEM;
578: atomic_add(skb->truesize, &sk->rmem_alloc);
579: skb->sk=sk;
580: __skb_queue_tail(&sk->receive_queue,skb);
581: if (!sk->dead)
582: sk->data_ready(sk,skb->len);
583: return 0;
584: }
585:
586: /*
587: * Recover an error report and clear atomically
588: */
589:
1.1.1.2 ! root 590: static __inline__ int sock_error(struct sock *sk)
1.1 root 591: {
592: int err=xchg(&sk->err,0);
593: return -err;
594: }
595:
596: /*
597: * Declarations from timer.c
598: */
599:
600: extern struct sock *timer_base;
601:
602: extern void delete_timer (struct sock *);
603: extern void reset_timer (struct sock *, int, unsigned long);
604: extern void net_timer (unsigned long);
605:
606:
607: /*
608: * Enable debug/info messages
609: */
610:
611: #define NETDEBUG(x) do { } while (0)
612:
613: #endif /* _SOCK_H */
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