/* * INET An implementation of the TCP/IP protocol suite for the LINUX * operating system. INET is implemented using the BSD Socket * interface as the means of communication with the user level. * * Generic socket support routines. Memory allocators, socket lock/release * handler for protocols to use and generic option handler. * * * Version: $Id: sock.c,v 1.102 2000/12/11 23:00:24 davem Exp $ * * Authors: Ross Biro, <bir7@leland.Stanford.Edu> * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> * Florian La Roche, <flla@stud.uni-sb.de> * Alan Cox, <A.Cox@swansea.ac.uk> * * Fixes: * Alan Cox : Numerous verify_area() problems * Alan Cox : Connecting on a connecting socket * now returns an error for tcp. * Alan Cox : sock->protocol is set correctly. * and is not sometimes left as 0. * Alan Cox : connect handles icmp errors on a * connect properly. Unfortunately there * is a restart syscall nasty there. I * can't match BSD without hacking the C * library. Ideas urgently sought! * Alan Cox : Disallow bind() to addresses that are * not ours - especially broadcast ones!! * Alan Cox : Socket 1024 _IS_ ok for users. (fencepost) * Alan Cox : sock_wfree/sock_rfree don't destroy sockets, * instead they leave that for the DESTROY timer. * Alan Cox : Clean up error flag in accept * Alan Cox : TCP ack handling is buggy, the DESTROY timer * was buggy. Put a remove_sock() in the handler * for memory when we hit 0. Also altered the timer * code. The ACK stuff can wait and needs major * TCP layer surgery. * Alan Cox : Fixed TCP ack bug, removed remove sock * and fixed timer/inet_bh race. * Alan Cox : Added zapped flag for TCP * Alan Cox : Move kfree_skb into skbuff.c and tidied up surplus code * Alan Cox : for new sk_buff allocations wmalloc/rmalloc now call alloc_skb * Alan Cox : kfree_s calls now are kfree_skbmem so we can track skb resources * Alan Cox : Supports socket option broadcast now as does udp. Packet and raw need fixing. * Alan Cox : Added RCVBUF,SNDBUF size setting. It suddenly occurred to me how easy it was so... * Rick Sladkey : Relaxed UDP rules for matching packets. * C.E.Hawkins : IFF_PROMISC/SIOCGHWADDR support * Pauline Middelink : identd support * Alan Cox : Fixed connect() taking signals I think. * Alan Cox : SO_LINGER supported * Alan Cox : Error reporting fixes * Anonymous : inet_create tidied up (sk->reuse setting) * Alan Cox : inet sockets don't set sk->type! * Alan Cox : Split socket option code * Alan Cox : Callbacks * Alan Cox : Nagle flag for Charles & Johannes stuff * Alex : Removed restriction on inet fioctl * Alan Cox : Splitting INET from NET core * Alan Cox : Fixed bogus SO_TYPE handling in getsockopt() * Adam Caldwell : Missing return in SO_DONTROUTE/SO_DEBUG code * Alan Cox : Split IP from generic code * Alan Cox : New kfree_skbmem() * Alan Cox : Make SO_DEBUG superuser only. * Alan Cox : Allow anyone to clear SO_DEBUG * (compatibility fix) * Alan Cox : Added optimistic memory grabbing for AF_UNIX throughput. * Alan Cox : Allocator for a socket is settable. * Alan Cox : SO_ERROR includes soft errors. * Alan Cox : Allow NULL arguments on some SO_ opts * Alan Cox : Generic socket allocation to make hooks * easier (suggested by Craig Metz). * Michael Pall : SO_ERROR returns positive errno again * Steve Whitehouse: Added default destructor to free * protocol private data. * Steve Whitehouse: Added various other default routines * common to several socket families. * Chris Evans : Call suser() check last on F_SETOWN * Jay Schulist : Added SO_ATTACH_FILTER and SO_DETACH_FILTER. * Andi Kleen : Add sock_kmalloc()/sock_kfree_s() * Andi Kleen : Fix write_space callback * * To Fix: * * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ #include <linux/config.h> #include <linux/errno.h> #include <linux/types.h> #include <linux/socket.h> #include <linux/in.h> #include <linux/kernel.h> #include <linux/major.h> #include <linux/sched.h> #include <linux/timer.h> #include <linux/string.h> #include <linux/sockios.h> #include <linux/net.h> #include <linux/fcntl.h> #include <linux/mm.h> #include <linux/slab.h> #include <linux/interrupt.h> #include <linux/poll.h> #include <linux/init.h> #include <asm/uaccess.h> #include <asm/system.h> #include <linux/inet.h> #include <linux/netdevice.h> #include <net/ip.h> #include <net/protocol.h> #include <net/arp.h> #include <net/route.h> #include <net/tcp.h> #include <net/udp.h> #include <linux/skbuff.h> #include <net/sock.h> #include <net/raw.h> #include <net/icmp.h> #include <linux/ipsec.h> #ifdef CONFIG_FILTER #include <linux/filter.h> #endif #define min(a,b) ((a)<(b)?(a):(b)) /* Run time adjustable parameters. */ __u32 sysctl_wmem_max = SK_WMEM_MAX; __u32 sysctl_rmem_max = SK_RMEM_MAX; __u32 sysctl_wmem_default = SK_WMEM_MAX; __u32 sysctl_rmem_default = SK_RMEM_MAX; /* Maximal space eaten by iovec or ancilliary data plus some space */ int sysctl_optmem_max = sizeof(unsigned long)*(2*UIO_MAXIOV + 512); 143 static int sock_set_timeout(long *timeo_p, char *optval, int optlen) { struct timeval tv; 147 if (optlen < sizeof(tv)) 148 return -EINVAL; 149 if (copy_from_user(&tv, optval, sizeof(tv))) 150 return -EFAULT; *timeo_p = MAX_SCHEDULE_TIMEOUT; 153 if (tv.tv_sec == 0 && tv.tv_usec == 0) 154 return 0; 155 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1)) *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ); 157 return 0; } /* * This is meant for all protocols to use and covers goings on * at the socket level. Everything here is generic. */ 165 int sock_setsockopt(struct socket *sock, int level, int optname, char *optval, int optlen) { struct sock *sk=sock->sk; #ifdef CONFIG_FILTER struct sk_filter *filter; #endif int val; int valbool; int err; struct linger ling; int ret = 0; /* * Options without arguments */ #ifdef SO_DONTLINGER /* Compatibility item... */ switch(optname) { case SO_DONTLINGER: sk->linger=0; return 0; } #endif 191 if(optlen<sizeof(int)) 192 return(-EINVAL); err = get_user(val, (int *)optval); 195 if (err) 196 return err; valbool = val?1:0; 200 lock_sock(sk); 202 switch(optname) { 204 case SO_DEBUG: 205 if(val && !capable(CAP_NET_ADMIN)) { ret = -EACCES; } 209 else sk->debug=valbool; 211 break; 212 case SO_REUSEADDR: sk->reuse = valbool; 214 break; 215 case SO_TYPE: 216 case SO_ERROR: ret = -ENOPROTOOPT; 218 break; 219 case SO_DONTROUTE: sk->localroute=valbool; 221 break; 222 case SO_BROADCAST: sk->broadcast=valbool; 224 break; 225 case SO_SNDBUF: /* Don't error on this BSD doesn't and if you think about it this is right. Otherwise apps have to play 'guess the biggest size' games. RCVBUF/SNDBUF are treated in BSD as hints */ 231 if (val > sysctl_wmem_max) val = sysctl_wmem_max; sk->userlocks |= SOCK_SNDBUF_LOCK; sk->sndbuf = max(val*2,SOCK_MIN_SNDBUF); /* * Wake up sending tasks if we * upped the value. */ sk->write_space(sk); 242 break; 244 case SO_RCVBUF: /* Don't error on this BSD doesn't and if you think about it this is right. Otherwise apps have to play 'guess the biggest size' games. RCVBUF/SNDBUF are treated in BSD as hints */ 250 if (val > sysctl_rmem_max) val = sysctl_rmem_max; sk->userlocks |= SOCK_RCVBUF_LOCK; /* FIXME: is this lower bound the right one? */ sk->rcvbuf = max(val*2,SOCK_MIN_RCVBUF); 256 break; 258 case SO_KEEPALIVE: #ifdef CONFIG_INET 260 if (sk->protocol == IPPROTO_TCP) { tcp_set_keepalive(sk, valbool); } #endif sk->keepopen = valbool; 266 break; 268 case SO_OOBINLINE: sk->urginline = valbool; 270 break; 272 case SO_NO_CHECK: sk->no_check = valbool; 274 break; 276 case SO_PRIORITY: 277 if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN)) sk->priority = val; 279 else ret = -EPERM; 281 break; 283 case SO_LINGER: 284 if(optlen<sizeof(ling)) { ret = -EINVAL; /* 1003.1g */ 286 break; } 288 if (copy_from_user(&ling,optval,sizeof(ling))) { ret = -EFAULT; 290 break; } 292 if(ling.l_onoff==0) { sk->linger=0; 294 } else { #if (BITS_PER_LONG == 32) 296 if (ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ) sk->lingertime=MAX_SCHEDULE_TIMEOUT; 298 else #endif sk->lingertime=ling.l_linger*HZ; sk->linger=1; } 303 break; 305 case SO_BSDCOMPAT: sk->bsdism = valbool; 307 break; 309 case SO_PASSCRED: sock->passcred = valbool; 311 break; 313 case SO_TIMESTAMP: sk->rcvtstamp = valbool; 315 break; 317 case SO_RCVLOWAT: 318 if (val < 0) val = INT_MAX; sk->rcvlowat = val ? : 1; 321 break; 323 case SO_RCVTIMEO: ret = sock_set_timeout(&sk->rcvtimeo, optval, optlen); 325 break; 327 case SO_SNDTIMEO: ret = sock_set_timeout(&sk->sndtimeo, optval, optlen); 329 break; #ifdef CONFIG_NETDEVICES 332 case SO_BINDTODEVICE: { char devname[IFNAMSIZ]; /* Sorry... */ 337 if (!capable(CAP_NET_RAW)) { ret = -EPERM; 339 break; } /* Bind this socket to a particular device like "eth0", * as specified in the passed interface name. If the * name is "" or the option length is zero the socket * is not bound. */ 348 if (!valbool) { sk->bound_dev_if = 0; 350 } else { 351 if (optlen > IFNAMSIZ) optlen = IFNAMSIZ; 353 if (copy_from_user(devname, optval, optlen)) { ret = -EFAULT; 355 break; } /* Remove any cached route for this socket. */ sk_dst_reset(sk); 361 if (devname[0] == '\0') { sk->bound_dev_if = 0; 363 } else { struct net_device *dev = dev_get_by_name(devname); 365 if (!dev) { ret = -ENODEV; 367 break; } sk->bound_dev_if = dev->ifindex; dev_put(dev); } } 373 break; } #endif #ifdef CONFIG_FILTER case SO_ATTACH_FILTER: ret = -EINVAL; if (optlen == sizeof(struct sock_fprog)) { struct sock_fprog fprog; ret = -EFAULT; if (copy_from_user(&fprog, optval, sizeof(fprog))) break; ret = sk_attach_filter(&fprog, sk); } break; case SO_DETACH_FILTER: spin_lock_bh(&sk->lock.slock); filter = sk->filter; if (filter) { sk->filter = NULL; spin_unlock_bh(&sk->lock.slock); sk_filter_release(sk, filter); break; } spin_unlock_bh(&sk->lock.slock); ret = -ENONET; break; #endif /* We implement the SO_SNDLOWAT etc to not be settable (1003.1g 5.3) */ 407 default: ret = -ENOPROTOOPT; 409 break; } 411 release_sock(sk); 412 return ret; } 416 int sock_getsockopt(struct socket *sock, int level, int optname, char *optval, int *optlen) { struct sock *sk = sock->sk; union { int val; struct linger ling; struct timeval tm; } v; int lv=sizeof(int),len; 430 if(get_user(len,optlen)) 431 return -EFAULT; 433 switch(optname) { 435 case SO_DEBUG: v.val = sk->debug; 437 break; 439 case SO_DONTROUTE: v.val = sk->localroute; 441 break; 443 case SO_BROADCAST: v.val= sk->broadcast; 445 break; 447 case SO_SNDBUF: v.val=sk->sndbuf; 449 break; 451 case SO_RCVBUF: v.val =sk->rcvbuf; 453 break; 455 case SO_REUSEADDR: v.val = sk->reuse; 457 break; 459 case SO_KEEPALIVE: v.val = sk->keepopen; 461 break; 463 case SO_TYPE: v.val = sk->type; 465 break; 467 case SO_ERROR: v.val = -sock_error(sk); 469 if(v.val==0) v.val=xchg(&sk->err_soft,0); 471 break; 473 case SO_OOBINLINE: v.val = sk->urginline; 475 break; 477 case SO_NO_CHECK: v.val = sk->no_check; 479 break; 481 case SO_PRIORITY: v.val = sk->priority; 483 break; 485 case SO_LINGER: lv=sizeof(v.ling); v.ling.l_onoff=sk->linger; v.ling.l_linger=sk->lingertime/HZ; 489 break; 491 case SO_BSDCOMPAT: v.val = sk->bsdism; 493 break; 495 case SO_TIMESTAMP: v.val = sk->rcvtstamp; 497 break; 499 case SO_RCVTIMEO: lv=sizeof(struct timeval); 501 if (sk->rcvtimeo == MAX_SCHEDULE_TIMEOUT) { v.tm.tv_sec = 0; v.tm.tv_usec = 0; 504 } else { v.tm.tv_sec = sk->rcvtimeo/HZ; v.tm.tv_usec = ((sk->rcvtimeo%HZ)*1000)/HZ; } 508 break; 510 case SO_SNDTIMEO: lv=sizeof(struct timeval); 512 if (sk->sndtimeo == MAX_SCHEDULE_TIMEOUT) { v.tm.tv_sec = 0; v.tm.tv_usec = 0; 515 } else { v.tm.tv_sec = sk->sndtimeo/HZ; v.tm.tv_usec = ((sk->sndtimeo%HZ)*1000)/HZ; } 519 break; 521 case SO_RCVLOWAT: v.val = sk->rcvlowat; 523 break; 525 case SO_SNDLOWAT: v.val=1; 527 break; 529 case SO_PASSCRED: v.val = sock->passcred; 531 break; 533 case SO_PEERCRED: lv=sizeof(sk->peercred); len=min(len, lv); 536 if(copy_to_user((void*)optval, &sk->peercred, len)) 537 return -EFAULT; 538 goto lenout; 540 case SO_PEERNAME: { char address[128]; 544 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2)) 545 return -ENOTCONN; 546 if (lv < len) 547 return -EINVAL; 548 if(copy_to_user((void*)optval, address, len)) 549 return -EFAULT; 550 goto lenout; } 553 default: 554 return(-ENOPROTOOPT); } len=min(len,lv); 557 if(copy_to_user(optval,&v,len)) 558 return -EFAULT; lenout: 560 if(put_user(len, optlen)) 561 return -EFAULT; 562 return 0; } static kmem_cache_t *sk_cachep; /* * All socket objects are allocated here. This is for future * usage. */ 572 struct sock *sk_alloc(int family, int priority, int zero_it) { struct sock *sk = kmem_cache_alloc(sk_cachep, priority); 576 if(sk && zero_it) { memset(sk, 0, sizeof(struct sock)); sk->family = family; 579 sock_lock_init(sk); } 582 return sk; } 585 void sk_free(struct sock *sk) { #ifdef CONFIG_FILTER struct sk_filter *filter; #endif 591 if (sk->destruct) sk->destruct(sk); #ifdef CONFIG_FILTER filter = sk->filter; if (filter) { sk_filter_release(sk, filter); sk->filter = NULL; } #endif 602 if (atomic_read(&sk->omem_alloc)) printk(KERN_DEBUG "sk_free: optmem leakage (%d bytes) detected.\n", atomic_read(&sk->omem_alloc)); kmem_cache_free(sk_cachep, sk); } 608 void __init sk_init(void) { sk_cachep = kmem_cache_create("sock", sizeof(struct sock), 0, SLAB_HWCACHE_ALIGN, 0, 0); 612 if (!sk_cachep) printk(KERN_CRIT "sk_init: Cannot create sock SLAB cache!"); 615 if (num_physpages <= 4096) { sysctl_wmem_max = 32767; sysctl_rmem_max = 32767; sysctl_wmem_default = 32767; sysctl_wmem_default = 32767; 620 } else if (num_physpages >= 131072) { sysctl_wmem_max = 131071; sysctl_rmem_max = 131071; } } /* * Simple resource managers for sockets. */ /* * Write buffer destructor automatically called from kfree_skb. */ 634 void sock_wfree(struct sk_buff *skb) { struct sock *sk = skb->sk; /* In case it might be waiting for more memory. */ atomic_sub(skb->truesize, &sk->wmem_alloc); sk->write_space(sk); sock_put(sk); } /* * Read buffer destructor automatically called from kfree_skb. */ 647 void sock_rfree(struct sk_buff *skb) { struct sock *sk = skb->sk; atomic_sub(skb->truesize, &sk->rmem_alloc); } /* * Allocate a skb from the socket's send buffer. */ 657 struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force, int priority) { 659 if (force || atomic_read(&sk->wmem_alloc) < sk->sndbuf) { struct sk_buff * skb = alloc_skb(size, priority); 661 if (skb) { skb_set_owner_w(skb, sk); 663 return skb; } } 666 return NULL; } /* * Allocate a skb from the socket's receive buffer. */ 672 struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force, int priority) { 674 if (force || atomic_read(&sk->rmem_alloc) < sk->rcvbuf) { struct sk_buff *skb = alloc_skb(size, priority); 676 if (skb) { skb_set_owner_r(skb, sk); 678 return skb; } } 681 return NULL; } /* * Allocate a memory block from the socket's option memory buffer. */ 687 void *sock_kmalloc(struct sock *sk, int size, int priority) { if ((unsigned)size <= sysctl_optmem_max && 690 atomic_read(&sk->omem_alloc)+size < sysctl_optmem_max) { void *mem; /* First do the add, to avoid the race if kmalloc * might sleep. */ atomic_add(size, &sk->omem_alloc); mem = kmalloc(size, priority); 697 if (mem) 698 return mem; atomic_sub(size, &sk->omem_alloc); } 701 return NULL; } /* * Free an option memory block. */ 707 void sock_kfree_s(struct sock *sk, void *mem, int size) { kfree(mem); atomic_sub(size, &sk->omem_alloc); } /* It is almost wait_for_tcp_memory minus release_sock/lock_sock. I think, these locks should be removed for datagram sockets. */ 716 static long sock_wait_for_wmem(struct sock * sk, long timeo) { DECLARE_WAITQUEUE(wait, current); clear_bit(SOCK_ASYNC_NOSPACE, &sk->socket->flags); add_wait_queue(sk->sleep, &wait); 722 for (;;) { 723 if (signal_pending(current)) 724 break; set_bit(SOCK_NOSPACE, &sk->socket->flags); 726 set_current_state(TASK_INTERRUPTIBLE); 727 if (atomic_read(&sk->wmem_alloc) < sk->sndbuf) 728 break; 729 if (sk->shutdown & SEND_SHUTDOWN) 730 break; 731 if (sk->err) 732 break; timeo = schedule_timeout(timeo); } 735 __set_current_state(TASK_RUNNING); remove_wait_queue(sk->sleep, &wait); 737 return timeo; } /* * Generic send/receive buffer handlers */ 745 struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size, unsigned long fallback, int noblock, int *errcode) { int err; struct sk_buff *skb; long timeo; timeo = sock_sndtimeo(sk, noblock); 754 while (1) { unsigned long try_size = size; err = sock_error(sk); 758 if (err != 0) 759 goto failure; /* * We should send SIGPIPE in these cases according to * 1003.1g draft 6.4. If we (the user) did a shutdown() * call however we should not. * * Note: This routine isnt just used for datagrams and * anyway some datagram protocols have a notion of * close down. */ err = -EPIPE; 772 if (sk->shutdown&SEND_SHUTDOWN) 773 goto failure; 775 if (atomic_read(&sk->wmem_alloc) < sk->sndbuf) { 776 if (fallback) { /* The buffer get won't block, or use the atomic queue. * It does produce annoying no free page messages still. */ skb = alloc_skb(size, GFP_BUFFER); 781 if (skb) 782 break; try_size = fallback; } skb = alloc_skb(try_size, sk->allocation); 786 if (skb) 787 break; err = -ENOBUFS; 789 goto failure; } /* * This means we have too many buffers for this socket already. */ set_bit(SOCK_ASYNC_NOSPACE, &sk->socket->flags); set_bit(SOCK_NOSPACE, &sk->socket->flags); err = -EAGAIN; 799 if (!timeo) 800 goto failure; 801 if (signal_pending(current)) 802 goto interrupted; timeo = sock_wait_for_wmem(sk, timeo); } skb_set_owner_w(skb, sk); 807 return skb; interrupted: err = sock_intr_errno(timeo); failure: *errcode = err; 813 return NULL; } 816 void __lock_sock(struct sock *sk) { DECLARE_WAITQUEUE(wait, current); add_wait_queue_exclusive(&sk->lock.wq, &wait); 821 for(;;) { current->state = TASK_UNINTERRUPTIBLE; 823 spin_unlock_bh(&sk->lock.slock); schedule(); 825 spin_lock_bh(&sk->lock.slock); 826 if(!sk->lock.users) 827 break; } current->state = TASK_RUNNING; remove_wait_queue(&sk->lock.wq, &wait); } 833 void __release_sock(struct sock *sk) { struct sk_buff *skb = sk->backlog.head; 837 do { sk->backlog.head = sk->backlog.tail = NULL; 839 bh_unlock_sock(sk); 841 do { struct sk_buff *next = skb->next; skb->next = NULL; sk->backlog_rcv(sk, skb); skb = next; 847 } while (skb != NULL); bh_lock_sock(sk); 850 } while((skb = sk->backlog.head) != NULL); } /* * Generic socket manager library. Most simpler socket families * use this to manage their socket lists. At some point we should * hash these. By making this generic we get the lot hashed for free. * * It is broken by design. All the protocols using it must be fixed. --ANK */ rwlock_t net_big_sklist_lock = RW_LOCK_UNLOCKED; 863 void sklist_remove_socket(struct sock **list, struct sock *sk) { struct sock *s; 867 write_lock_bh(&net_big_sklist_lock); 869 while ((s = *list) != NULL) { 870 if (s == sk) { *list = s->next; 872 break; } list = &s->next; } 877 write_unlock_bh(&net_big_sklist_lock); 878 if (s) sock_put(s); } 882 void sklist_insert_socket(struct sock **list, struct sock *sk) { 884 write_lock_bh(&net_big_sklist_lock); sk->next= *list; *list=sk; sock_hold(sk); 888 write_unlock_bh(&net_big_sklist_lock); } /* * This is only called from user mode. Thus it protects itself against * interrupt users but doesn't worry about being called during work. * Once it is removed from the queue no interrupt or bottom half will * touch it and we are (fairly 8-) ) safe. */ void sklist_destroy_socket(struct sock **list, struct sock *sk); /* * Handler for deferred kills. */ 904 static void sklist_destroy_timer(unsigned long data) { struct sock *sk=(struct sock *)data; sklist_destroy_socket(NULL,sk); } /* * Destroy a socket. We pass NULL for a list if we know the * socket is not on a list. */ 915 void sklist_destroy_socket(struct sock **list,struct sock *sk) { struct sk_buff *skb; 918 if(list) sklist_remove_socket(list, sk); 921 while((skb=skb_dequeue(&sk->receive_queue))!=NULL) { kfree_skb(skb); } if(atomic_read(&sk->wmem_alloc) == 0 && atomic_read(&sk->rmem_alloc) == 0 && 928 sk->dead) { sock_put(sk); } 932 else { /* * Someone is using our buffers still.. defer */ init_timer(&sk->timer); sk->timer.expires=jiffies+SOCK_DESTROY_TIME; sk->timer.function=sklist_destroy_timer; sk->timer.data = (unsigned long)sk; add_timer(&sk->timer); } } /* * Set of default routines for initialising struct proto_ops when * the protocol does not support a particular function. In certain * cases where it makes no sense for a protocol to have a "do nothing" * function, some default processing is provided. */ 952 int sock_no_release(struct socket *sock) { 954 return 0; } 957 int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len) { 959 return -EOPNOTSUPP; } 962 int sock_no_connect(struct socket *sock, struct sockaddr *saddr, int len, int flags) { 965 return -EOPNOTSUPP; } 968 int sock_no_socketpair(struct socket *sock1, struct socket *sock2) { 970 return -EOPNOTSUPP; } 973 int sock_no_accept(struct socket *sock, struct socket *newsock, int flags) { 975 return -EOPNOTSUPP; } 978 int sock_no_getname(struct socket *sock, struct sockaddr *saddr, int *len, int peer) { 981 return -EOPNOTSUPP; } 984 unsigned int sock_no_poll(struct file * file, struct socket *sock, poll_table *pt) { 986 return 0; } 989 int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) { 991 return -EOPNOTSUPP; } 994 int sock_no_listen(struct socket *sock, int backlog) { 996 return -EOPNOTSUPP; } 999 int sock_no_shutdown(struct socket *sock, int how) { 1001 return -EOPNOTSUPP; } 1004 int sock_no_setsockopt(struct socket *sock, int level, int optname, char *optval, int optlen) { 1007 return -EOPNOTSUPP; } 1010 int sock_no_getsockopt(struct socket *sock, int level, int optname, char *optval, int *optlen) { 1013 return -EOPNOTSUPP; } /* * Note: if you add something that sleeps here then change sock_fcntl() * to do proper fd locking. */ 1020 int sock_no_fcntl(struct socket *sock, unsigned int cmd, unsigned long arg) { struct sock *sk = sock->sk; 1024 switch(cmd) { 1026 case F_SETOWN: /* * This is a little restrictive, but it's the only * way to make sure that you can't send a sigurg to * another process. */ if (current->pgrp != -arg && current->pid != arg && 1034 !capable(CAP_KILL)) return(-EPERM); sk->proc = arg; 1036 return(0); 1037 case F_GETOWN: 1038 return(sk->proc); 1039 default: 1040 return(-EINVAL); } } 1044 int sock_no_sendmsg(struct socket *sock, struct msghdr *m, int flags, struct scm_cookie *scm) { 1047 return -EOPNOTSUPP; } 1050 int sock_no_recvmsg(struct socket *sock, struct msghdr *m, int len, int flags, struct scm_cookie *scm) { 1053 return -EOPNOTSUPP; } 1056 int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma) { /* Mirror missing mmap method error code */ 1059 return -ENODEV; } /* * Default Socket Callbacks */ 1066 void sock_def_wakeup(struct sock *sk) { read_lock(&sk->callback_lock); 1069 if (sk->sleep && waitqueue_active(sk->sleep)) wake_up_interruptible_all(sk->sleep); 1071 read_unlock(&sk->callback_lock); } 1074 void sock_def_error_report(struct sock *sk) { read_lock(&sk->callback_lock); 1077 if (sk->sleep && waitqueue_active(sk->sleep)) wake_up_interruptible(sk->sleep); sk_wake_async(sk,0,POLL_ERR); 1080 read_unlock(&sk->callback_lock); } 1083 void sock_def_readable(struct sock *sk, int len) { read_lock(&sk->callback_lock); 1086 if (sk->sleep && waitqueue_active(sk->sleep)) wake_up_interruptible(sk->sleep); sk_wake_async(sk,1,POLL_IN); 1089 read_unlock(&sk->callback_lock); } 1092 void sock_def_write_space(struct sock *sk) { read_lock(&sk->callback_lock); /* Do not wake up a writer until he can make "significant" * progress. --DaveM */ 1099 if((atomic_read(&sk->wmem_alloc) << 1) <= sk->sndbuf) { 1100 if (sk->sleep && waitqueue_active(sk->sleep)) wake_up_interruptible(sk->sleep); /* Should agree with poll, otherwise some programs break */ 1104 if (sock_writeable(sk)) sk_wake_async(sk, 2, POLL_OUT); } 1108 read_unlock(&sk->callback_lock); } 1111 void sock_def_destruct(struct sock *sk) { 1113 if (sk->protinfo.destruct_hook) kfree(sk->protinfo.destruct_hook); } 1117 void sock_init_data(struct socket *sock, struct sock *sk) { skb_queue_head_init(&sk->receive_queue); skb_queue_head_init(&sk->write_queue); skb_queue_head_init(&sk->error_queue); init_timer(&sk->timer); sk->allocation = GFP_KERNEL; sk->rcvbuf = sysctl_rmem_default; sk->sndbuf = sysctl_wmem_default; sk->state = TCP_CLOSE; sk->zapped = 1; sk->socket = sock; 1132 if(sock) { sk->type = sock->type; sk->sleep = &sock->wait; sock->sk = sk; 1137 } else sk->sleep = NULL; sk->dst_lock = RW_LOCK_UNLOCKED; sk->callback_lock = RW_LOCK_UNLOCKED; sk->state_change = sock_def_wakeup; sk->data_ready = sock_def_readable; sk->write_space = sock_def_write_space; sk->error_report = sock_def_error_report; sk->destruct = sock_def_destruct; sk->peercred.pid = 0; sk->peercred.uid = -1; sk->peercred.gid = -1; sk->rcvlowat = 1; sk->rcvtimeo = MAX_SCHEDULE_TIMEOUT; sk->sndtimeo = MAX_SCHEDULE_TIMEOUT; atomic_set(&sk->refcnt, 1); }