This source file includes following definitions.
- sock_setsockopt
- sock_getsockopt
- sock_wmalloc
- sock_rmalloc
- sock_rspace
- sock_wspace
- sock_wfree
- sock_rfree
- sock_alloc_send_skb
- release_sock
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79 #include <linux/config.h>
80 #include <linux/errno.h>
81 #include <linux/types.h>
82 #include <linux/socket.h>
83 #include <linux/in.h>
84 #include <linux/kernel.h>
85 #include <linux/major.h>
86 #include <linux/sched.h>
87 #include <linux/timer.h>
88 #include <linux/string.h>
89 #include <linux/sockios.h>
90 #include <linux/net.h>
91 #include <linux/fcntl.h>
92 #include <linux/mm.h>
93 #include <linux/interrupt.h>
94
95 #include <asm/segment.h>
96 #include <asm/system.h>
97
98 #include <linux/inet.h>
99 #include <linux/netdevice.h>
100 #include <net/ip.h>
101 #include <net/protocol.h>
102 #include <net/arp.h>
103 #include <net/rarp.h>
104 #include <net/route.h>
105 #include <net/tcp.h>
106 #include <net/udp.h>
107 #include <linux/skbuff.h>
108 #include <net/sock.h>
109 #include <net/raw.h>
110 #include <net/icmp.h>
111
112 #define min(a,b) ((a)<(b)?(a):(b))
113
114
115
116
117
118
119 int sock_setsockopt(struct sock *sk, int level, int optname,
120 char *optval, int optlen)
121 {
122 int val;
123 int valbool;
124 int err;
125 struct linger ling;
126
127 if (optval == NULL)
128 return(-EINVAL);
129
130 err=verify_area(VERIFY_READ, optval, sizeof(int));
131 if(err)
132 return err;
133
134 val = get_user((int *)optval);
135 valbool = val?1:0;
136
137 switch(optname)
138 {
139 case SO_DEBUG:
140 if(val && !suser())
141 return(-EPERM);
142 sk->debug=valbool;
143 return 0;
144 case SO_REUSEADDR:
145 sk->reuse = valbool;
146 return(0);
147 case SO_TYPE:
148 case SO_ERROR:
149 return(-ENOPROTOOPT);
150 case SO_DONTROUTE:
151 sk->localroute=valbool;
152 return 0;
153 case SO_BROADCAST:
154 sk->broadcast=valbool;
155 return 0;
156 case SO_SNDBUF:
157 if(val>32767)
158 val=32767;
159 if(val<256)
160 val=256;
161 sk->sndbuf=val;
162 return 0;
163
164 case SO_RCVBUF:
165 if(val>32767)
166 val=32767;
167 if(val<256)
168 val=256;
169 sk->rcvbuf=val;
170 return(0);
171
172 case SO_KEEPALIVE:
173 sk->keepopen = valbool;
174 return(0);
175
176 case SO_OOBINLINE:
177 sk->urginline = valbool;
178 return(0);
179
180 case SO_NO_CHECK:
181 sk->no_check = valbool;
182 return(0);
183
184 case SO_PRIORITY:
185 if (val >= 0 && val < DEV_NUMBUFFS)
186 {
187 sk->priority = val;
188 }
189 else
190 {
191 return(-EINVAL);
192 }
193 return(0);
194
195
196 case SO_LINGER:
197 err=verify_area(VERIFY_READ,optval,sizeof(ling));
198 if(err)
199 return err;
200 memcpy_fromfs(&ling,optval,sizeof(ling));
201 if(ling.l_onoff==0)
202 sk->linger=0;
203 else
204 {
205 sk->lingertime=ling.l_linger;
206 sk->linger=1;
207 }
208 return 0;
209
210
211 default:
212 return(-ENOPROTOOPT);
213 }
214 }
215
216
217 int sock_getsockopt(struct sock *sk, int level, int optname,
218 char *optval, int *optlen)
219 {
220 int val;
221 int err;
222 struct linger ling;
223
224 switch(optname)
225 {
226 case SO_DEBUG:
227 val = sk->debug;
228 break;
229
230 case SO_DONTROUTE:
231 val = sk->localroute;
232 break;
233
234 case SO_BROADCAST:
235 val= sk->broadcast;
236 break;
237
238 case SO_SNDBUF:
239 val=sk->sndbuf;
240 break;
241
242 case SO_RCVBUF:
243 val =sk->rcvbuf;
244 break;
245
246 case SO_REUSEADDR:
247 val = sk->reuse;
248 break;
249
250 case SO_KEEPALIVE:
251 val = sk->keepopen;
252 break;
253
254 case SO_TYPE:
255 val = sk->type;
256 break;
257
258 case SO_ERROR:
259 val = sk->err;
260 sk->err = 0;
261 break;
262
263 case SO_OOBINLINE:
264 val = sk->urginline;
265 break;
266
267 case SO_NO_CHECK:
268 val = sk->no_check;
269 break;
270
271 case SO_PRIORITY:
272 val = sk->priority;
273 break;
274
275 case SO_LINGER:
276 err=verify_area(VERIFY_WRITE,optval,sizeof(ling));
277 if(err)
278 return err;
279 err=verify_area(VERIFY_WRITE,optlen,sizeof(int));
280 if(err)
281 return err;
282 put_fs_long(sizeof(ling),(unsigned long *)optlen);
283 ling.l_onoff=sk->linger;
284 ling.l_linger=sk->lingertime;
285 memcpy_tofs(optval,&ling,sizeof(ling));
286 return 0;
287
288
289
290 default:
291 return(-ENOPROTOOPT);
292 }
293 err=verify_area(VERIFY_WRITE, optlen, sizeof(int));
294 if(err)
295 return err;
296 put_fs_long(sizeof(int),(unsigned long *) optlen);
297
298 err=verify_area(VERIFY_WRITE, optval, sizeof(int));
299 if(err)
300 return err;
301 put_fs_long(val,(unsigned long *)optval);
302
303 return(0);
304 }
305
306
307 struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force, int priority)
308 {
309 if (sk)
310 {
311 if (sk->wmem_alloc + size < sk->sndbuf || force)
312 {
313 struct sk_buff * c = alloc_skb(size, priority);
314 if (c)
315 {
316 unsigned long flags;
317 save_flags(flags);
318 cli();
319 sk->wmem_alloc+= c->truesize;
320 restore_flags(flags);
321 }
322 return c;
323 }
324 return(NULL);
325 }
326 return(alloc_skb(size, priority));
327 }
328
329
330 struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force, int priority)
331 {
332 if (sk)
333 {
334 if (sk->rmem_alloc + size < sk->rcvbuf || force)
335 {
336 struct sk_buff *c = alloc_skb(size, priority);
337 if (c)
338 {
339 unsigned long flags;
340 save_flags(flags);
341 cli();
342 sk->rmem_alloc += c->truesize;
343 restore_flags(flags);
344 }
345 return(c);
346 }
347 return(NULL);
348 }
349 return(alloc_skb(size, priority));
350 }
351
352
353 unsigned long sock_rspace(struct sock *sk)
354 {
355 int amt;
356
357 if (sk != NULL)
358 {
359 if (sk->rmem_alloc >= sk->rcvbuf-2*MIN_WINDOW)
360 return(0);
361 amt = min((sk->rcvbuf-sk->rmem_alloc)/2-MIN_WINDOW, MAX_WINDOW);
362 if (amt < 0)
363 return(0);
364 return(amt);
365 }
366 return(0);
367 }
368
369
370 unsigned long sock_wspace(struct sock *sk)
371 {
372 if (sk != NULL)
373 {
374 if (sk->shutdown & SEND_SHUTDOWN)
375 return(0);
376 if (sk->wmem_alloc >= sk->sndbuf)
377 return(0);
378 return(sk->sndbuf-sk->wmem_alloc );
379 }
380 return(0);
381 }
382
383
384 void sock_wfree(struct sock *sk, struct sk_buff *skb)
385 {
386 int s=skb->truesize;
387 #if CONFIG_SKB_CHECK
388 IS_SKB(skb);
389 #endif
390 kfree_skbmem(skb);
391 if (sk)
392 {
393 unsigned long flags;
394 save_flags(flags);
395 cli();
396 sk->wmem_alloc -= s;
397 restore_flags(flags);
398
399 sk->write_space(sk);
400 return;
401 }
402 }
403
404
405 void sock_rfree(struct sock *sk, struct sk_buff *skb)
406 {
407 int s=skb->truesize;
408 #if CONFIG_SKB_CHECK
409 IS_SKB(skb);
410 #endif
411 kfree_skbmem(skb);
412 if (sk)
413 {
414 unsigned long flags;
415 save_flags(flags);
416 cli();
417 sk->rmem_alloc -= s;
418 restore_flags(flags);
419 }
420 }
421
422
423
424
425
426 struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size, unsigned long fallback, int noblock, int *errcode)
427 {
428 struct sk_buff *skb;
429 int err;
430
431 sk->inuse=1;
432
433 do
434 {
435 if(sk->err!=0)
436 {
437 cli();
438 err= -sk->err;
439 sk->err=0;
440 sti();
441 *errcode=err;
442 return NULL;
443 }
444
445 if(sk->shutdown&SEND_SHUTDOWN)
446 {
447 *errcode=-EPIPE;
448 return NULL;
449 }
450
451 if(!fallback)
452 skb = sock_wmalloc(sk, size, 0, sk->allocation);
453 else
454 {
455
456
457 skb = sock_wmalloc(sk, size, 0 , GFP_BUFFER);
458 if(!skb)
459 skb=sock_wmalloc(sk, fallback, 0, GFP_KERNEL);
460 }
461
462
463
464
465
466 if(skb==NULL)
467 {
468 unsigned long tmp;
469
470 sk->socket->flags |= SO_NOSPACE;
471 if(noblock)
472 {
473 *errcode=-EAGAIN;
474 return NULL;
475 }
476 if(sk->shutdown&SEND_SHUTDOWN)
477 {
478 *errcode=-EPIPE;
479 return NULL;
480 }
481 tmp = sk->wmem_alloc;
482 cli();
483 if(sk->shutdown&SEND_SHUTDOWN)
484 {
485 sti();
486 *errcode=-EPIPE;
487 return NULL;
488 }
489
490 if( tmp <= sk->wmem_alloc)
491 {
492 sk->socket->flags &= ~SO_NOSPACE;
493 interruptible_sleep_on(sk->sleep);
494 if (current->signal & ~current->blocked)
495 {
496 sti();
497 *errcode = -ERESTARTSYS;
498 return NULL;
499 }
500 }
501 sti();
502 }
503 }
504 while(skb==NULL);
505
506 return skb;
507 }
508
509
510 void release_sock(struct sock *sk)
511 {
512 unsigned long flags;
513 #ifdef CONFIG_INET
514 struct sk_buff *skb;
515 #endif
516
517 if (!sk->prot)
518 return;
519
520
521
522
523
524
525
526 save_flags(flags);
527 cli();
528 if (sk->blog)
529 {
530 restore_flags(flags);
531 return;
532 }
533 sk->blog=1;
534 sk->inuse = 1;
535 restore_flags(flags);
536 #ifdef CONFIG_INET
537
538 while((skb = skb_dequeue(&sk->back_log)) != NULL)
539 {
540 sk->blog = 1;
541 if (sk->prot->rcv)
542 sk->prot->rcv(skb, skb->dev, sk->opt,
543 skb->saddr, skb->len, skb->daddr, 1,
544
545 (struct inet_protocol *)sk->pair);
546 }
547 #endif
548 sk->blog = 0;
549 sk->inuse = 0;
550 #ifdef CONFIG_INET
551 if (sk->dead && sk->state == TCP_CLOSE)
552 {
553
554 reset_timer(sk, TIME_DONE, min(sk->rtt * 2, TCP_DONE_TIME));
555 }
556 #endif
557 }
558
559