| 1 |
1278 |
phoenix |
/*
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| 2 |
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* INET An implementation of the TCP/IP protocol suite for the LINUX
|
| 3 |
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* operating system. INET is implemented using the BSD Socket
|
| 4 |
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* interface as the means of communication with the user level.
|
| 5 |
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*
|
| 6 |
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* Generic socket support routines. Memory allocators, socket lock/release
|
| 7 |
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* handler for protocols to use and generic option handler.
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| 8 |
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*
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| 9 |
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*
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| 10 |
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* Version: $Id: sock.c,v 1.1.1.1 2004-04-17 22:13:17 phoenix Exp $
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| 11 |
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*
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| 12 |
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* Authors: Ross Biro, <bir7@leland.Stanford.Edu>
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| 13 |
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* Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
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| 14 |
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* Florian La Roche, <flla@stud.uni-sb.de>
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| 15 |
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* Alan Cox, <A.Cox@swansea.ac.uk>
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| 16 |
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*
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| 17 |
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* Fixes:
|
| 18 |
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* Alan Cox : Numerous verify_area() problems
|
| 19 |
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* Alan Cox : Connecting on a connecting socket
|
| 20 |
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* now returns an error for tcp.
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| 21 |
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* Alan Cox : sock->protocol is set correctly.
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| 22 |
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* and is not sometimes left as 0.
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* Alan Cox : connect handles icmp errors on a
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| 24 |
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* connect properly. Unfortunately there
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| 25 |
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* is a restart syscall nasty there. I
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| 26 |
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* can't match BSD without hacking the C
|
| 27 |
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* library. Ideas urgently sought!
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| 28 |
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* Alan Cox : Disallow bind() to addresses that are
|
| 29 |
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* not ours - especially broadcast ones!!
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| 30 |
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* Alan Cox : Socket 1024 _IS_ ok for users. (fencepost)
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| 31 |
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* Alan Cox : sock_wfree/sock_rfree don't destroy sockets,
|
| 32 |
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* instead they leave that for the DESTROY timer.
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* Alan Cox : Clean up error flag in accept
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* Alan Cox : TCP ack handling is buggy, the DESTROY timer
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| 35 |
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* was buggy. Put a remove_sock() in the handler
|
| 36 |
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* for memory when we hit 0. Also altered the timer
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| 37 |
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* code. The ACK stuff can wait and needs major
|
| 38 |
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* TCP layer surgery.
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| 39 |
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* Alan Cox : Fixed TCP ack bug, removed remove sock
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| 40 |
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* and fixed timer/inet_bh race.
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| 41 |
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* Alan Cox : Added zapped flag for TCP
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| 42 |
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* Alan Cox : Move kfree_skb into skbuff.c and tidied up surplus code
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| 43 |
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* Alan Cox : for new sk_buff allocations wmalloc/rmalloc now call alloc_skb
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| 44 |
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* Alan Cox : kfree_s calls now are kfree_skbmem so we can track skb resources
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| 45 |
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* Alan Cox : Supports socket option broadcast now as does udp. Packet and raw need fixing.
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| 46 |
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* Alan Cox : Added RCVBUF,SNDBUF size setting. It suddenly occurred to me how easy it was so...
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| 47 |
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* Rick Sladkey : Relaxed UDP rules for matching packets.
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| 48 |
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* C.E.Hawkins : IFF_PROMISC/SIOCGHWADDR support
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| 49 |
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* Pauline Middelink : identd support
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| 50 |
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* Alan Cox : Fixed connect() taking signals I think.
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| 51 |
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* Alan Cox : SO_LINGER supported
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| 52 |
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* Alan Cox : Error reporting fixes
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| 53 |
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* Anonymous : inet_create tidied up (sk->reuse setting)
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| 54 |
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* Alan Cox : inet sockets don't set sk->type!
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| 55 |
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* Alan Cox : Split socket option code
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| 56 |
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* Alan Cox : Callbacks
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| 57 |
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* Alan Cox : Nagle flag for Charles & Johannes stuff
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| 58 |
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* Alex : Removed restriction on inet fioctl
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| 59 |
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* Alan Cox : Splitting INET from NET core
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| 60 |
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* Alan Cox : Fixed bogus SO_TYPE handling in getsockopt()
|
| 61 |
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* Adam Caldwell : Missing return in SO_DONTROUTE/SO_DEBUG code
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* Alan Cox : Split IP from generic code
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| 63 |
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* Alan Cox : New kfree_skbmem()
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| 64 |
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* Alan Cox : Make SO_DEBUG superuser only.
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| 65 |
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* Alan Cox : Allow anyone to clear SO_DEBUG
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| 66 |
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* (compatibility fix)
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| 67 |
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* Alan Cox : Added optimistic memory grabbing for AF_UNIX throughput.
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| 68 |
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* Alan Cox : Allocator for a socket is settable.
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| 69 |
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* Alan Cox : SO_ERROR includes soft errors.
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| 70 |
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* Alan Cox : Allow NULL arguments on some SO_ opts
|
| 71 |
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* Alan Cox : Generic socket allocation to make hooks
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| 72 |
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* easier (suggested by Craig Metz).
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| 73 |
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* Michael Pall : SO_ERROR returns positive errno again
|
| 74 |
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* Steve Whitehouse: Added default destructor to free
|
| 75 |
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* protocol private data.
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| 76 |
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* Steve Whitehouse: Added various other default routines
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| 77 |
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* common to several socket families.
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| 78 |
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* Chris Evans : Call suser() check last on F_SETOWN
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| 79 |
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* Jay Schulist : Added SO_ATTACH_FILTER and SO_DETACH_FILTER.
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| 80 |
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* Andi Kleen : Add sock_kmalloc()/sock_kfree_s()
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| 81 |
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* Andi Kleen : Fix write_space callback
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| 82 |
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* Chris Evans : Security fixes - signedness again
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| 83 |
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* Arnaldo C. Melo : cleanups, use skb_queue_purge
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| 84 |
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*
|
| 85 |
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* To Fix:
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| 86 |
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*
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| 87 |
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*
|
| 88 |
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* This program is free software; you can redistribute it and/or
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| 89 |
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* modify it under the terms of the GNU General Public License
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| 90 |
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* as published by the Free Software Foundation; either version
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| 91 |
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* 2 of the License, or (at your option) any later version.
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| 92 |
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*/
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| 93 |
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| 94 |
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#include <linux/config.h>
|
| 95 |
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#include <linux/errno.h>
|
| 96 |
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#include <linux/types.h>
|
| 97 |
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#include <linux/socket.h>
|
| 98 |
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#include <linux/in.h>
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| 99 |
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#include <linux/kernel.h>
|
| 100 |
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#include <linux/major.h>
|
| 101 |
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#include <linux/sched.h>
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| 102 |
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#include <linux/timer.h>
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| 103 |
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#include <linux/string.h>
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| 104 |
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#include <linux/sockios.h>
|
| 105 |
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#include <linux/net.h>
|
| 106 |
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#include <linux/fcntl.h>
|
| 107 |
|
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#include <linux/mm.h>
|
| 108 |
|
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#include <linux/slab.h>
|
| 109 |
|
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#include <linux/interrupt.h>
|
| 110 |
|
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#include <linux/poll.h>
|
| 111 |
|
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#include <linux/tcp.h>
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| 112 |
|
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#include <linux/init.h>
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| 113 |
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|
| 114 |
|
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#include <asm/uaccess.h>
|
| 115 |
|
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#include <asm/system.h>
|
| 116 |
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|
| 117 |
|
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#include <linux/netdevice.h>
|
| 118 |
|
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#include <net/protocol.h>
|
| 119 |
|
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#include <linux/skbuff.h>
|
| 120 |
|
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#include <net/sock.h>
|
| 121 |
|
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#include <linux/ipsec.h>
|
| 122 |
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|
| 123 |
|
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#ifdef CONFIG_FILTER
|
| 124 |
|
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#include <linux/filter.h>
|
| 125 |
|
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#endif
|
| 126 |
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|
| 127 |
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#ifdef CONFIG_INET
|
| 128 |
|
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#include <net/tcp.h>
|
| 129 |
|
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#endif
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| 130 |
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|
|
| 131 |
|
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/* Take into consideration the size of the struct sk_buff overhead in the
|
| 132 |
|
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* determination of these values, since that is non-constant across
|
| 133 |
|
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* platforms. This makes socket queueing behavior and performance
|
| 134 |
|
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* not depend upon such differences.
|
| 135 |
|
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*/
|
| 136 |
|
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#define _SK_MEM_PACKETS 256
|
| 137 |
|
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#define _SK_MEM_OVERHEAD (sizeof(struct sk_buff) + 256)
|
| 138 |
|
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#define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
|
| 139 |
|
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#define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
|
| 140 |
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|
|
| 141 |
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/* Run time adjustable parameters. */
|
| 142 |
|
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__u32 sysctl_wmem_max = SK_WMEM_MAX;
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| 143 |
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__u32 sysctl_rmem_max = SK_RMEM_MAX;
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| 144 |
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__u32 sysctl_wmem_default = SK_WMEM_MAX;
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| 145 |
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__u32 sysctl_rmem_default = SK_RMEM_MAX;
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| 146 |
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|
| 147 |
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/* Maximal space eaten by iovec or ancilliary data plus some space */
|
| 148 |
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int sysctl_optmem_max = sizeof(unsigned long)*(2*UIO_MAXIOV + 512);
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| 149 |
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|
| 150 |
|
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static int sock_set_timeout(long *timeo_p, char *optval, int optlen)
|
| 151 |
|
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{
|
| 152 |
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struct timeval tv;
|
| 153 |
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|
| 154 |
|
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if (optlen < sizeof(tv))
|
| 155 |
|
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return -EINVAL;
|
| 156 |
|
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if (copy_from_user(&tv, optval, sizeof(tv)))
|
| 157 |
|
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return -EFAULT;
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| 158 |
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|
| 159 |
|
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*timeo_p = MAX_SCHEDULE_TIMEOUT;
|
| 160 |
|
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if (tv.tv_sec == 0 && tv.tv_usec == 0)
|
| 161 |
|
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return 0;
|
| 162 |
|
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if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1))
|
| 163 |
|
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*timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ);
|
| 164 |
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return 0;
|
| 165 |
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}
|
| 166 |
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|
| 167 |
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/*
|
| 168 |
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* This is meant for all protocols to use and covers goings on
|
| 169 |
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* at the socket level. Everything here is generic.
|
| 170 |
|
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*/
|
| 171 |
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|
| 172 |
|
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int sock_setsockopt(struct socket *sock, int level, int optname,
|
| 173 |
|
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char *optval, int optlen)
|
| 174 |
|
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{
|
| 175 |
|
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struct sock *sk=sock->sk;
|
| 176 |
|
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#ifdef CONFIG_FILTER
|
| 177 |
|
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struct sk_filter *filter;
|
| 178 |
|
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#endif
|
| 179 |
|
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int val;
|
| 180 |
|
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int valbool;
|
| 181 |
|
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struct linger ling;
|
| 182 |
|
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int ret = 0;
|
| 183 |
|
|
|
| 184 |
|
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/*
|
| 185 |
|
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* Options without arguments
|
| 186 |
|
|
*/
|
| 187 |
|
|
|
| 188 |
|
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#ifdef SO_DONTLINGER /* Compatibility item... */
|
| 189 |
|
|
switch(optname)
|
| 190 |
|
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{
|
| 191 |
|
|
case SO_DONTLINGER:
|
| 192 |
|
|
sk->linger=0;
|
| 193 |
|
|
return 0;
|
| 194 |
|
|
}
|
| 195 |
|
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#endif
|
| 196 |
|
|
|
| 197 |
|
|
if(optlen<sizeof(int))
|
| 198 |
|
|
return(-EINVAL);
|
| 199 |
|
|
|
| 200 |
|
|
if (get_user(val, (int *)optval))
|
| 201 |
|
|
return -EFAULT;
|
| 202 |
|
|
|
| 203 |
|
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valbool = val?1:0;
|
| 204 |
|
|
|
| 205 |
|
|
lock_sock(sk);
|
| 206 |
|
|
|
| 207 |
|
|
switch(optname)
|
| 208 |
|
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{
|
| 209 |
|
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case SO_DEBUG:
|
| 210 |
|
|
if(val && !capable(CAP_NET_ADMIN))
|
| 211 |
|
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{
|
| 212 |
|
|
ret = -EACCES;
|
| 213 |
|
|
}
|
| 214 |
|
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else
|
| 215 |
|
|
sk->debug=valbool;
|
| 216 |
|
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break;
|
| 217 |
|
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case SO_REUSEADDR:
|
| 218 |
|
|
sk->reuse = valbool;
|
| 219 |
|
|
break;
|
| 220 |
|
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case SO_TYPE:
|
| 221 |
|
|
case SO_ERROR:
|
| 222 |
|
|
ret = -ENOPROTOOPT;
|
| 223 |
|
|
break;
|
| 224 |
|
|
case SO_DONTROUTE:
|
| 225 |
|
|
sk->localroute=valbool;
|
| 226 |
|
|
break;
|
| 227 |
|
|
case SO_BROADCAST:
|
| 228 |
|
|
sk->broadcast=valbool;
|
| 229 |
|
|
break;
|
| 230 |
|
|
case SO_SNDBUF:
|
| 231 |
|
|
/* Don't error on this BSD doesn't and if you think
|
| 232 |
|
|
about it this is right. Otherwise apps have to
|
| 233 |
|
|
play 'guess the biggest size' games. RCVBUF/SNDBUF
|
| 234 |
|
|
are treated in BSD as hints */
|
| 235 |
|
|
|
| 236 |
|
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if (val > sysctl_wmem_max)
|
| 237 |
|
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val = sysctl_wmem_max;
|
| 238 |
|
|
|
| 239 |
|
|
sk->userlocks |= SOCK_SNDBUF_LOCK;
|
| 240 |
|
|
if ((val * 2) < SOCK_MIN_SNDBUF)
|
| 241 |
|
|
sk->sndbuf = SOCK_MIN_SNDBUF;
|
| 242 |
|
|
else
|
| 243 |
|
|
sk->sndbuf = (val * 2);
|
| 244 |
|
|
|
| 245 |
|
|
/*
|
| 246 |
|
|
* Wake up sending tasks if we
|
| 247 |
|
|
* upped the value.
|
| 248 |
|
|
*/
|
| 249 |
|
|
sk->write_space(sk);
|
| 250 |
|
|
break;
|
| 251 |
|
|
|
| 252 |
|
|
case SO_RCVBUF:
|
| 253 |
|
|
/* Don't error on this BSD doesn't and if you think
|
| 254 |
|
|
about it this is right. Otherwise apps have to
|
| 255 |
|
|
play 'guess the biggest size' games. RCVBUF/SNDBUF
|
| 256 |
|
|
are treated in BSD as hints */
|
| 257 |
|
|
|
| 258 |
|
|
if (val > sysctl_rmem_max)
|
| 259 |
|
|
val = sysctl_rmem_max;
|
| 260 |
|
|
|
| 261 |
|
|
sk->userlocks |= SOCK_RCVBUF_LOCK;
|
| 262 |
|
|
/* FIXME: is this lower bound the right one? */
|
| 263 |
|
|
if ((val * 2) < SOCK_MIN_RCVBUF)
|
| 264 |
|
|
sk->rcvbuf = SOCK_MIN_RCVBUF;
|
| 265 |
|
|
else
|
| 266 |
|
|
sk->rcvbuf = (val * 2);
|
| 267 |
|
|
break;
|
| 268 |
|
|
|
| 269 |
|
|
case SO_KEEPALIVE:
|
| 270 |
|
|
#ifdef CONFIG_INET
|
| 271 |
|
|
if (sk->protocol == IPPROTO_TCP)
|
| 272 |
|
|
{
|
| 273 |
|
|
tcp_set_keepalive(sk, valbool);
|
| 274 |
|
|
}
|
| 275 |
|
|
#endif
|
| 276 |
|
|
sk->keepopen = valbool;
|
| 277 |
|
|
break;
|
| 278 |
|
|
|
| 279 |
|
|
case SO_OOBINLINE:
|
| 280 |
|
|
sk->urginline = valbool;
|
| 281 |
|
|
break;
|
| 282 |
|
|
|
| 283 |
|
|
case SO_NO_CHECK:
|
| 284 |
|
|
sk->no_check = valbool;
|
| 285 |
|
|
break;
|
| 286 |
|
|
|
| 287 |
|
|
case SO_PRIORITY:
|
| 288 |
|
|
if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN))
|
| 289 |
|
|
sk->priority = val;
|
| 290 |
|
|
else
|
| 291 |
|
|
ret = -EPERM;
|
| 292 |
|
|
break;
|
| 293 |
|
|
|
| 294 |
|
|
case SO_LINGER:
|
| 295 |
|
|
if(optlen<sizeof(ling)) {
|
| 296 |
|
|
ret = -EINVAL; /* 1003.1g */
|
| 297 |
|
|
break;
|
| 298 |
|
|
}
|
| 299 |
|
|
if (copy_from_user(&ling,optval,sizeof(ling))) {
|
| 300 |
|
|
ret = -EFAULT;
|
| 301 |
|
|
break;
|
| 302 |
|
|
}
|
| 303 |
|
|
if(ling.l_onoff==0) {
|
| 304 |
|
|
sk->linger=0;
|
| 305 |
|
|
} else {
|
| 306 |
|
|
#if (BITS_PER_LONG == 32)
|
| 307 |
|
|
if (ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
|
| 308 |
|
|
sk->lingertime=MAX_SCHEDULE_TIMEOUT;
|
| 309 |
|
|
else
|
| 310 |
|
|
#endif
|
| 311 |
|
|
sk->lingertime=ling.l_linger*HZ;
|
| 312 |
|
|
sk->linger=1;
|
| 313 |
|
|
}
|
| 314 |
|
|
break;
|
| 315 |
|
|
|
| 316 |
|
|
case SO_BSDCOMPAT:
|
| 317 |
|
|
sk->bsdism = valbool;
|
| 318 |
|
|
break;
|
| 319 |
|
|
|
| 320 |
|
|
case SO_PASSCRED:
|
| 321 |
|
|
sock->passcred = valbool;
|
| 322 |
|
|
break;
|
| 323 |
|
|
|
| 324 |
|
|
case SO_TIMESTAMP:
|
| 325 |
|
|
sk->rcvtstamp = valbool;
|
| 326 |
|
|
break;
|
| 327 |
|
|
|
| 328 |
|
|
case SO_RCVLOWAT:
|
| 329 |
|
|
if (val < 0)
|
| 330 |
|
|
val = INT_MAX;
|
| 331 |
|
|
sk->rcvlowat = val ? : 1;
|
| 332 |
|
|
break;
|
| 333 |
|
|
|
| 334 |
|
|
case SO_RCVTIMEO:
|
| 335 |
|
|
ret = sock_set_timeout(&sk->rcvtimeo, optval, optlen);
|
| 336 |
|
|
break;
|
| 337 |
|
|
|
| 338 |
|
|
case SO_SNDTIMEO:
|
| 339 |
|
|
ret = sock_set_timeout(&sk->sndtimeo, optval, optlen);
|
| 340 |
|
|
break;
|
| 341 |
|
|
|
| 342 |
|
|
#ifdef CONFIG_NETDEVICES
|
| 343 |
|
|
case SO_BINDTODEVICE:
|
| 344 |
|
|
{
|
| 345 |
|
|
char devname[IFNAMSIZ];
|
| 346 |
|
|
|
| 347 |
|
|
/* Sorry... */
|
| 348 |
|
|
if (!capable(CAP_NET_RAW)) {
|
| 349 |
|
|
ret = -EPERM;
|
| 350 |
|
|
break;
|
| 351 |
|
|
}
|
| 352 |
|
|
|
| 353 |
|
|
/* Bind this socket to a particular device like "eth0",
|
| 354 |
|
|
* as specified in the passed interface name. If the
|
| 355 |
|
|
* name is "" or the option length is zero the socket
|
| 356 |
|
|
* is not bound.
|
| 357 |
|
|
*/
|
| 358 |
|
|
|
| 359 |
|
|
if (!valbool) {
|
| 360 |
|
|
sk->bound_dev_if = 0;
|
| 361 |
|
|
} else {
|
| 362 |
|
|
if (optlen > IFNAMSIZ)
|
| 363 |
|
|
optlen = IFNAMSIZ;
|
| 364 |
|
|
if (copy_from_user(devname, optval, optlen)) {
|
| 365 |
|
|
ret = -EFAULT;
|
| 366 |
|
|
break;
|
| 367 |
|
|
}
|
| 368 |
|
|
|
| 369 |
|
|
/* Remove any cached route for this socket. */
|
| 370 |
|
|
sk_dst_reset(sk);
|
| 371 |
|
|
|
| 372 |
|
|
if (devname[0] == '\0') {
|
| 373 |
|
|
sk->bound_dev_if = 0;
|
| 374 |
|
|
} else {
|
| 375 |
|
|
struct net_device *dev = dev_get_by_name(devname);
|
| 376 |
|
|
if (!dev) {
|
| 377 |
|
|
ret = -ENODEV;
|
| 378 |
|
|
break;
|
| 379 |
|
|
}
|
| 380 |
|
|
sk->bound_dev_if = dev->ifindex;
|
| 381 |
|
|
dev_put(dev);
|
| 382 |
|
|
}
|
| 383 |
|
|
}
|
| 384 |
|
|
break;
|
| 385 |
|
|
}
|
| 386 |
|
|
#endif
|
| 387 |
|
|
|
| 388 |
|
|
|
| 389 |
|
|
#ifdef CONFIG_FILTER
|
| 390 |
|
|
case SO_ATTACH_FILTER:
|
| 391 |
|
|
ret = -EINVAL;
|
| 392 |
|
|
if (optlen == sizeof(struct sock_fprog)) {
|
| 393 |
|
|
struct sock_fprog fprog;
|
| 394 |
|
|
|
| 395 |
|
|
ret = -EFAULT;
|
| 396 |
|
|
if (copy_from_user(&fprog, optval, sizeof(fprog)))
|
| 397 |
|
|
break;
|
| 398 |
|
|
|
| 399 |
|
|
ret = sk_attach_filter(&fprog, sk);
|
| 400 |
|
|
}
|
| 401 |
|
|
break;
|
| 402 |
|
|
|
| 403 |
|
|
case SO_DETACH_FILTER:
|
| 404 |
|
|
spin_lock_bh(&sk->lock.slock);
|
| 405 |
|
|
filter = sk->filter;
|
| 406 |
|
|
if (filter) {
|
| 407 |
|
|
sk->filter = NULL;
|
| 408 |
|
|
spin_unlock_bh(&sk->lock.slock);
|
| 409 |
|
|
sk_filter_release(sk, filter);
|
| 410 |
|
|
break;
|
| 411 |
|
|
}
|
| 412 |
|
|
spin_unlock_bh(&sk->lock.slock);
|
| 413 |
|
|
ret = -ENONET;
|
| 414 |
|
|
break;
|
| 415 |
|
|
#endif
|
| 416 |
|
|
/* We implement the SO_SNDLOWAT etc to
|
| 417 |
|
|
not be settable (1003.1g 5.3) */
|
| 418 |
|
|
default:
|
| 419 |
|
|
ret = -ENOPROTOOPT;
|
| 420 |
|
|
break;
|
| 421 |
|
|
}
|
| 422 |
|
|
release_sock(sk);
|
| 423 |
|
|
return ret;
|
| 424 |
|
|
}
|
| 425 |
|
|
|
| 426 |
|
|
|
| 427 |
|
|
int sock_getsockopt(struct socket *sock, int level, int optname,
|
| 428 |
|
|
char *optval, int *optlen)
|
| 429 |
|
|
{
|
| 430 |
|
|
struct sock *sk = sock->sk;
|
| 431 |
|
|
|
| 432 |
|
|
union
|
| 433 |
|
|
{
|
| 434 |
|
|
int val;
|
| 435 |
|
|
struct linger ling;
|
| 436 |
|
|
struct timeval tm;
|
| 437 |
|
|
} v;
|
| 438 |
|
|
|
| 439 |
|
|
unsigned int lv=sizeof(int),len;
|
| 440 |
|
|
|
| 441 |
|
|
if(get_user(len,optlen))
|
| 442 |
|
|
return -EFAULT;
|
| 443 |
|
|
if(len < 0)
|
| 444 |
|
|
return -EINVAL;
|
| 445 |
|
|
|
| 446 |
|
|
switch(optname)
|
| 447 |
|
|
{
|
| 448 |
|
|
case SO_DEBUG:
|
| 449 |
|
|
v.val = sk->debug;
|
| 450 |
|
|
break;
|
| 451 |
|
|
|
| 452 |
|
|
case SO_DONTROUTE:
|
| 453 |
|
|
v.val = sk->localroute;
|
| 454 |
|
|
break;
|
| 455 |
|
|
|
| 456 |
|
|
case SO_BROADCAST:
|
| 457 |
|
|
v.val= sk->broadcast;
|
| 458 |
|
|
break;
|
| 459 |
|
|
|
| 460 |
|
|
case SO_SNDBUF:
|
| 461 |
|
|
v.val=sk->sndbuf;
|
| 462 |
|
|
break;
|
| 463 |
|
|
|
| 464 |
|
|
case SO_RCVBUF:
|
| 465 |
|
|
v.val =sk->rcvbuf;
|
| 466 |
|
|
break;
|
| 467 |
|
|
|
| 468 |
|
|
case SO_REUSEADDR:
|
| 469 |
|
|
v.val = sk->reuse;
|
| 470 |
|
|
break;
|
| 471 |
|
|
|
| 472 |
|
|
case SO_KEEPALIVE:
|
| 473 |
|
|
v.val = sk->keepopen;
|
| 474 |
|
|
break;
|
| 475 |
|
|
|
| 476 |
|
|
case SO_TYPE:
|
| 477 |
|
|
v.val = sk->type;
|
| 478 |
|
|
break;
|
| 479 |
|
|
|
| 480 |
|
|
case SO_ERROR:
|
| 481 |
|
|
v.val = -sock_error(sk);
|
| 482 |
|
|
if(v.val==0)
|
| 483 |
|
|
v.val=xchg(&sk->err_soft,0);
|
| 484 |
|
|
break;
|
| 485 |
|
|
|
| 486 |
|
|
case SO_OOBINLINE:
|
| 487 |
|
|
v.val = sk->urginline;
|
| 488 |
|
|
break;
|
| 489 |
|
|
|
| 490 |
|
|
case SO_NO_CHECK:
|
| 491 |
|
|
v.val = sk->no_check;
|
| 492 |
|
|
break;
|
| 493 |
|
|
|
| 494 |
|
|
case SO_PRIORITY:
|
| 495 |
|
|
v.val = sk->priority;
|
| 496 |
|
|
break;
|
| 497 |
|
|
|
| 498 |
|
|
case SO_LINGER:
|
| 499 |
|
|
lv=sizeof(v.ling);
|
| 500 |
|
|
v.ling.l_onoff=sk->linger;
|
| 501 |
|
|
v.ling.l_linger=sk->lingertime/HZ;
|
| 502 |
|
|
break;
|
| 503 |
|
|
|
| 504 |
|
|
case SO_BSDCOMPAT:
|
| 505 |
|
|
v.val = sk->bsdism;
|
| 506 |
|
|
break;
|
| 507 |
|
|
|
| 508 |
|
|
case SO_TIMESTAMP:
|
| 509 |
|
|
v.val = sk->rcvtstamp;
|
| 510 |
|
|
break;
|
| 511 |
|
|
|
| 512 |
|
|
case SO_RCVTIMEO:
|
| 513 |
|
|
lv=sizeof(struct timeval);
|
| 514 |
|
|
if (sk->rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
|
| 515 |
|
|
v.tm.tv_sec = 0;
|
| 516 |
|
|
v.tm.tv_usec = 0;
|
| 517 |
|
|
} else {
|
| 518 |
|
|
v.tm.tv_sec = sk->rcvtimeo/HZ;
|
| 519 |
|
|
v.tm.tv_usec = ((sk->rcvtimeo%HZ)*1000)/HZ;
|
| 520 |
|
|
}
|
| 521 |
|
|
break;
|
| 522 |
|
|
|
| 523 |
|
|
case SO_SNDTIMEO:
|
| 524 |
|
|
lv=sizeof(struct timeval);
|
| 525 |
|
|
if (sk->sndtimeo == MAX_SCHEDULE_TIMEOUT) {
|
| 526 |
|
|
v.tm.tv_sec = 0;
|
| 527 |
|
|
v.tm.tv_usec = 0;
|
| 528 |
|
|
} else {
|
| 529 |
|
|
v.tm.tv_sec = sk->sndtimeo/HZ;
|
| 530 |
|
|
v.tm.tv_usec = ((sk->sndtimeo%HZ)*1000)/HZ;
|
| 531 |
|
|
}
|
| 532 |
|
|
break;
|
| 533 |
|
|
|
| 534 |
|
|
case SO_RCVLOWAT:
|
| 535 |
|
|
v.val = sk->rcvlowat;
|
| 536 |
|
|
break;
|
| 537 |
|
|
|
| 538 |
|
|
case SO_SNDLOWAT:
|
| 539 |
|
|
v.val=1;
|
| 540 |
|
|
break;
|
| 541 |
|
|
|
| 542 |
|
|
case SO_PASSCRED:
|
| 543 |
|
|
v.val = sock->passcred;
|
| 544 |
|
|
break;
|
| 545 |
|
|
|
| 546 |
|
|
case SO_PEERCRED:
|
| 547 |
|
|
if (len > sizeof(sk->peercred))
|
| 548 |
|
|
len = sizeof(sk->peercred);
|
| 549 |
|
|
if (copy_to_user(optval, &sk->peercred, len))
|
| 550 |
|
|
return -EFAULT;
|
| 551 |
|
|
goto lenout;
|
| 552 |
|
|
|
| 553 |
|
|
case SO_PEERNAME:
|
| 554 |
|
|
{
|
| 555 |
|
|
char address[128];
|
| 556 |
|
|
|
| 557 |
|
|
if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
|
| 558 |
|
|
return -ENOTCONN;
|
| 559 |
|
|
if (lv < len)
|
| 560 |
|
|
return -EINVAL;
|
| 561 |
|
|
if(copy_to_user((void*)optval, address, len))
|
| 562 |
|
|
return -EFAULT;
|
| 563 |
|
|
goto lenout;
|
| 564 |
|
|
}
|
| 565 |
|
|
|
| 566 |
|
|
/* Dubious BSD thing... Probably nobody even uses it, but
|
| 567 |
|
|
* the UNIX standard wants it for whatever reason... -DaveM
|
| 568 |
|
|
*/
|
| 569 |
|
|
case SO_ACCEPTCONN:
|
| 570 |
|
|
v.val = (sk->state == TCP_LISTEN);
|
| 571 |
|
|
break;
|
| 572 |
|
|
|
| 573 |
|
|
default:
|
| 574 |
|
|
return(-ENOPROTOOPT);
|
| 575 |
|
|
}
|
| 576 |
|
|
if (len > lv)
|
| 577 |
|
|
len = lv;
|
| 578 |
|
|
if (copy_to_user(optval, &v, len))
|
| 579 |
|
|
return -EFAULT;
|
| 580 |
|
|
lenout:
|
| 581 |
|
|
if (put_user(len, optlen))
|
| 582 |
|
|
return -EFAULT;
|
| 583 |
|
|
return 0;
|
| 584 |
|
|
}
|
| 585 |
|
|
|
| 586 |
|
|
static kmem_cache_t *sk_cachep;
|
| 587 |
|
|
|
| 588 |
|
|
/*
|
| 589 |
|
|
* All socket objects are allocated here. This is for future
|
| 590 |
|
|
* usage.
|
| 591 |
|
|
*/
|
| 592 |
|
|
|
| 593 |
|
|
struct sock *sk_alloc(int family, int priority, int zero_it)
|
| 594 |
|
|
{
|
| 595 |
|
|
struct sock *sk = kmem_cache_alloc(sk_cachep, priority);
|
| 596 |
|
|
|
| 597 |
|
|
if(sk && zero_it) {
|
| 598 |
|
|
memset(sk, 0, sizeof(struct sock));
|
| 599 |
|
|
sk->family = family;
|
| 600 |
|
|
sock_lock_init(sk);
|
| 601 |
|
|
}
|
| 602 |
|
|
|
| 603 |
|
|
return sk;
|
| 604 |
|
|
}
|
| 605 |
|
|
|
| 606 |
|
|
void sk_free(struct sock *sk)
|
| 607 |
|
|
{
|
| 608 |
|
|
#ifdef CONFIG_FILTER
|
| 609 |
|
|
struct sk_filter *filter;
|
| 610 |
|
|
#endif
|
| 611 |
|
|
|
| 612 |
|
|
if (sk->destruct)
|
| 613 |
|
|
sk->destruct(sk);
|
| 614 |
|
|
|
| 615 |
|
|
#ifdef CONFIG_FILTER
|
| 616 |
|
|
filter = sk->filter;
|
| 617 |
|
|
if (filter) {
|
| 618 |
|
|
sk_filter_release(sk, filter);
|
| 619 |
|
|
sk->filter = NULL;
|
| 620 |
|
|
}
|
| 621 |
|
|
#endif
|
| 622 |
|
|
|
| 623 |
|
|
if (atomic_read(&sk->omem_alloc))
|
| 624 |
|
|
printk(KERN_DEBUG "sk_free: optmem leakage (%d bytes) detected.\n", atomic_read(&sk->omem_alloc));
|
| 625 |
|
|
|
| 626 |
|
|
kmem_cache_free(sk_cachep, sk);
|
| 627 |
|
|
}
|
| 628 |
|
|
|
| 629 |
|
|
void __init sk_init(void)
|
| 630 |
|
|
{
|
| 631 |
|
|
sk_cachep = kmem_cache_create("sock", sizeof(struct sock), 0,
|
| 632 |
|
|
SLAB_HWCACHE_ALIGN, 0, 0);
|
| 633 |
|
|
if (!sk_cachep)
|
| 634 |
|
|
printk(KERN_CRIT "sk_init: Cannot create sock SLAB cache!");
|
| 635 |
|
|
|
| 636 |
|
|
if (num_physpages <= 4096) {
|
| 637 |
|
|
sysctl_wmem_max = 32767;
|
| 638 |
|
|
sysctl_rmem_max = 32767;
|
| 639 |
|
|
sysctl_wmem_default = 32767;
|
| 640 |
|
|
sysctl_rmem_default = 32767;
|
| 641 |
|
|
} else if (num_physpages >= 131072) {
|
| 642 |
|
|
sysctl_wmem_max = 131071;
|
| 643 |
|
|
sysctl_rmem_max = 131071;
|
| 644 |
|
|
}
|
| 645 |
|
|
}
|
| 646 |
|
|
|
| 647 |
|
|
/*
|
| 648 |
|
|
* Simple resource managers for sockets.
|
| 649 |
|
|
*/
|
| 650 |
|
|
|
| 651 |
|
|
|
| 652 |
|
|
/*
|
| 653 |
|
|
* Write buffer destructor automatically called from kfree_skb.
|
| 654 |
|
|
*/
|
| 655 |
|
|
void sock_wfree(struct sk_buff *skb)
|
| 656 |
|
|
{
|
| 657 |
|
|
struct sock *sk = skb->sk;
|
| 658 |
|
|
|
| 659 |
|
|
/* In case it might be waiting for more memory. */
|
| 660 |
|
|
atomic_sub(skb->truesize, &sk->wmem_alloc);
|
| 661 |
|
|
if (!sk->use_write_queue)
|
| 662 |
|
|
sk->write_space(sk);
|
| 663 |
|
|
sock_put(sk);
|
| 664 |
|
|
}
|
| 665 |
|
|
|
| 666 |
|
|
/*
|
| 667 |
|
|
* Read buffer destructor automatically called from kfree_skb.
|
| 668 |
|
|
*/
|
| 669 |
|
|
void sock_rfree(struct sk_buff *skb)
|
| 670 |
|
|
{
|
| 671 |
|
|
struct sock *sk = skb->sk;
|
| 672 |
|
|
|
| 673 |
|
|
atomic_sub(skb->truesize, &sk->rmem_alloc);
|
| 674 |
|
|
}
|
| 675 |
|
|
|
| 676 |
|
|
/*
|
| 677 |
|
|
* Allocate a skb from the socket's send buffer.
|
| 678 |
|
|
*/
|
| 679 |
|
|
struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force, int priority)
|
| 680 |
|
|
{
|
| 681 |
|
|
if (force || atomic_read(&sk->wmem_alloc) < sk->sndbuf) {
|
| 682 |
|
|
struct sk_buff * skb = alloc_skb(size, priority);
|
| 683 |
|
|
if (skb) {
|
| 684 |
|
|
skb_set_owner_w(skb, sk);
|
| 685 |
|
|
return skb;
|
| 686 |
|
|
}
|
| 687 |
|
|
}
|
| 688 |
|
|
return NULL;
|
| 689 |
|
|
}
|
| 690 |
|
|
|
| 691 |
|
|
/*
|
| 692 |
|
|
* Allocate a skb from the socket's receive buffer.
|
| 693 |
|
|
*/
|
| 694 |
|
|
struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force, int priority)
|
| 695 |
|
|
{
|
| 696 |
|
|
if (force || atomic_read(&sk->rmem_alloc) < sk->rcvbuf) {
|
| 697 |
|
|
struct sk_buff *skb = alloc_skb(size, priority);
|
| 698 |
|
|
if (skb) {
|
| 699 |
|
|
skb_set_owner_r(skb, sk);
|
| 700 |
|
|
return skb;
|
| 701 |
|
|
}
|
| 702 |
|
|
}
|
| 703 |
|
|
return NULL;
|
| 704 |
|
|
}
|
| 705 |
|
|
|
| 706 |
|
|
/*
|
| 707 |
|
|
* Allocate a memory block from the socket's option memory buffer.
|
| 708 |
|
|
*/
|
| 709 |
|
|
void *sock_kmalloc(struct sock *sk, int size, int priority)
|
| 710 |
|
|
{
|
| 711 |
|
|
if ((unsigned)size <= sysctl_optmem_max &&
|
| 712 |
|
|
atomic_read(&sk->omem_alloc)+size < sysctl_optmem_max) {
|
| 713 |
|
|
void *mem;
|
| 714 |
|
|
/* First do the add, to avoid the race if kmalloc
|
| 715 |
|
|
* might sleep.
|
| 716 |
|
|
*/
|
| 717 |
|
|
atomic_add(size, &sk->omem_alloc);
|
| 718 |
|
|
mem = kmalloc(size, priority);
|
| 719 |
|
|
if (mem)
|
| 720 |
|
|
return mem;
|
| 721 |
|
|
atomic_sub(size, &sk->omem_alloc);
|
| 722 |
|
|
}
|
| 723 |
|
|
return NULL;
|
| 724 |
|
|
}
|
| 725 |
|
|
|
| 726 |
|
|
/*
|
| 727 |
|
|
* Free an option memory block.
|
| 728 |
|
|
*/
|
| 729 |
|
|
void sock_kfree_s(struct sock *sk, void *mem, int size)
|
| 730 |
|
|
{
|
| 731 |
|
|
kfree(mem);
|
| 732 |
|
|
atomic_sub(size, &sk->omem_alloc);
|
| 733 |
|
|
}
|
| 734 |
|
|
|
| 735 |
|
|
/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
|
| 736 |
|
|
I think, these locks should be removed for datagram sockets.
|
| 737 |
|
|
*/
|
| 738 |
|
|
static long sock_wait_for_wmem(struct sock * sk, long timeo)
|
| 739 |
|
|
{
|
| 740 |
|
|
DECLARE_WAITQUEUE(wait, current);
|
| 741 |
|
|
|
| 742 |
|
|
clear_bit(SOCK_ASYNC_NOSPACE, &sk->socket->flags);
|
| 743 |
|
|
add_wait_queue(sk->sleep, &wait);
|
| 744 |
|
|
for (;;) {
|
| 745 |
|
|
if (!timeo)
|
| 746 |
|
|
break;
|
| 747 |
|
|
if (signal_pending(current))
|
| 748 |
|
|
break;
|
| 749 |
|
|
set_bit(SOCK_NOSPACE, &sk->socket->flags);
|
| 750 |
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
| 751 |
|
|
if (atomic_read(&sk->wmem_alloc) < sk->sndbuf)
|
| 752 |
|
|
break;
|
| 753 |
|
|
if (sk->shutdown & SEND_SHUTDOWN)
|
| 754 |
|
|
break;
|
| 755 |
|
|
if (sk->err)
|
| 756 |
|
|
break;
|
| 757 |
|
|
timeo = schedule_timeout(timeo);
|
| 758 |
|
|
}
|
| 759 |
|
|
__set_current_state(TASK_RUNNING);
|
| 760 |
|
|
remove_wait_queue(sk->sleep, &wait);
|
| 761 |
|
|
return timeo;
|
| 762 |
|
|
}
|
| 763 |
|
|
|
| 764 |
|
|
|
| 765 |
|
|
/*
|
| 766 |
|
|
* Generic send/receive buffer handlers
|
| 767 |
|
|
*/
|
| 768 |
|
|
|
| 769 |
|
|
struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
|
| 770 |
|
|
unsigned long data_len, int noblock, int *errcode)
|
| 771 |
|
|
{
|
| 772 |
|
|
struct sk_buff *skb;
|
| 773 |
|
|
long timeo;
|
| 774 |
|
|
int err;
|
| 775 |
|
|
|
| 776 |
|
|
timeo = sock_sndtimeo(sk, noblock);
|
| 777 |
|
|
while (1) {
|
| 778 |
|
|
err = sock_error(sk);
|
| 779 |
|
|
if (err != 0)
|
| 780 |
|
|
goto failure;
|
| 781 |
|
|
|
| 782 |
|
|
err = -EPIPE;
|
| 783 |
|
|
if (sk->shutdown & SEND_SHUTDOWN)
|
| 784 |
|
|
goto failure;
|
| 785 |
|
|
|
| 786 |
|
|
if (atomic_read(&sk->wmem_alloc) < sk->sndbuf) {
|
| 787 |
|
|
skb = alloc_skb(header_len, sk->allocation);
|
| 788 |
|
|
if (skb) {
|
| 789 |
|
|
int npages;
|
| 790 |
|
|
int i;
|
| 791 |
|
|
|
| 792 |
|
|
/* No pages, we're done... */
|
| 793 |
|
|
if (!data_len)
|
| 794 |
|
|
break;
|
| 795 |
|
|
|
| 796 |
|
|
npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
|
| 797 |
|
|
skb->truesize += data_len;
|
| 798 |
|
|
skb_shinfo(skb)->nr_frags = npages;
|
| 799 |
|
|
for (i = 0; i < npages; i++) {
|
| 800 |
|
|
struct page *page;
|
| 801 |
|
|
skb_frag_t *frag;
|
| 802 |
|
|
|
| 803 |
|
|
page = alloc_pages(sk->allocation, 0);
|
| 804 |
|
|
if (!page) {
|
| 805 |
|
|
err = -ENOBUFS;
|
| 806 |
|
|
skb_shinfo(skb)->nr_frags = i;
|
| 807 |
|
|
kfree_skb(skb);
|
| 808 |
|
|
goto failure;
|
| 809 |
|
|
}
|
| 810 |
|
|
|
| 811 |
|
|
frag = &skb_shinfo(skb)->frags[i];
|
| 812 |
|
|
frag->page = page;
|
| 813 |
|
|
frag->page_offset = 0;
|
| 814 |
|
|
frag->size = (data_len >= PAGE_SIZE ?
|
| 815 |
|
|
PAGE_SIZE :
|
| 816 |
|
|
data_len);
|
| 817 |
|
|
data_len -= PAGE_SIZE;
|
| 818 |
|
|
}
|
| 819 |
|
|
|
| 820 |
|
|
/* Full success... */
|
| 821 |
|
|
break;
|
| 822 |
|
|
}
|
| 823 |
|
|
err = -ENOBUFS;
|
| 824 |
|
|
goto failure;
|
| 825 |
|
|
}
|
| 826 |
|
|
set_bit(SOCK_ASYNC_NOSPACE, &sk->socket->flags);
|
| 827 |
|
|
set_bit(SOCK_NOSPACE, &sk->socket->flags);
|
| 828 |
|
|
err = -EAGAIN;
|
| 829 |
|
|
if (!timeo)
|
| 830 |
|
|
goto failure;
|
| 831 |
|
|
if (signal_pending(current))
|
| 832 |
|
|
goto interrupted;
|
| 833 |
|
|
timeo = sock_wait_for_wmem(sk, timeo);
|
| 834 |
|
|
}
|
| 835 |
|
|
|
| 836 |
|
|
skb_set_owner_w(skb, sk);
|
| 837 |
|
|
return skb;
|
| 838 |
|
|
|
| 839 |
|
|
interrupted:
|
| 840 |
|
|
err = sock_intr_errno(timeo);
|
| 841 |
|
|
failure:
|
| 842 |
|
|
*errcode = err;
|
| 843 |
|
|
return NULL;
|
| 844 |
|
|
}
|
| 845 |
|
|
|
| 846 |
|
|
struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
|
| 847 |
|
|
int noblock, int *errcode)
|
| 848 |
|
|
{
|
| 849 |
|
|
return sock_alloc_send_pskb(sk, size, 0, noblock, errcode);
|
| 850 |
|
|
}
|
| 851 |
|
|
|
| 852 |
|
|
void __lock_sock(struct sock *sk)
|
| 853 |
|
|
{
|
| 854 |
|
|
DECLARE_WAITQUEUE(wait, current);
|
| 855 |
|
|
|
| 856 |
|
|
add_wait_queue_exclusive(&sk->lock.wq, &wait);
|
| 857 |
|
|
for(;;) {
|
| 858 |
|
|
current->state = TASK_UNINTERRUPTIBLE;
|
| 859 |
|
|
spin_unlock_bh(&sk->lock.slock);
|
| 860 |
|
|
schedule();
|
| 861 |
|
|
spin_lock_bh(&sk->lock.slock);
|
| 862 |
|
|
if(!sk->lock.users)
|
| 863 |
|
|
break;
|
| 864 |
|
|
}
|
| 865 |
|
|
current->state = TASK_RUNNING;
|
| 866 |
|
|
remove_wait_queue(&sk->lock.wq, &wait);
|
| 867 |
|
|
}
|
| 868 |
|
|
|
| 869 |
|
|
void __release_sock(struct sock *sk)
|
| 870 |
|
|
{
|
| 871 |
|
|
struct sk_buff *skb = sk->backlog.head;
|
| 872 |
|
|
|
| 873 |
|
|
do {
|
| 874 |
|
|
sk->backlog.head = sk->backlog.tail = NULL;
|
| 875 |
|
|
bh_unlock_sock(sk);
|
| 876 |
|
|
|
| 877 |
|
|
do {
|
| 878 |
|
|
struct sk_buff *next = skb->next;
|
| 879 |
|
|
|
| 880 |
|
|
skb->next = NULL;
|
| 881 |
|
|
sk->backlog_rcv(sk, skb);
|
| 882 |
|
|
skb = next;
|
| 883 |
|
|
} while (skb != NULL);
|
| 884 |
|
|
|
| 885 |
|
|
bh_lock_sock(sk);
|
| 886 |
|
|
} while((skb = sk->backlog.head) != NULL);
|
| 887 |
|
|
}
|
| 888 |
|
|
|
| 889 |
|
|
/*
|
| 890 |
|
|
* Generic socket manager library. Most simpler socket families
|
| 891 |
|
|
* use this to manage their socket lists. At some point we should
|
| 892 |
|
|
* hash these. By making this generic we get the lot hashed for free.
|
| 893 |
|
|
*
|
| 894 |
|
|
* It is broken by design. All the protocols using it must be fixed. --ANK
|
| 895 |
|
|
*/
|
| 896 |
|
|
|
| 897 |
|
|
rwlock_t net_big_sklist_lock = RW_LOCK_UNLOCKED;
|
| 898 |
|
|
|
| 899 |
|
|
void sklist_remove_socket(struct sock **list, struct sock *sk)
|
| 900 |
|
|
{
|
| 901 |
|
|
struct sock *s;
|
| 902 |
|
|
|
| 903 |
|
|
write_lock_bh(&net_big_sklist_lock);
|
| 904 |
|
|
|
| 905 |
|
|
while ((s = *list) != NULL) {
|
| 906 |
|
|
if (s == sk) {
|
| 907 |
|
|
*list = s->next;
|
| 908 |
|
|
break;
|
| 909 |
|
|
}
|
| 910 |
|
|
list = &s->next;
|
| 911 |
|
|
}
|
| 912 |
|
|
|
| 913 |
|
|
write_unlock_bh(&net_big_sklist_lock);
|
| 914 |
|
|
if (s)
|
| 915 |
|
|
sock_put(s);
|
| 916 |
|
|
}
|
| 917 |
|
|
|
| 918 |
|
|
void sklist_insert_socket(struct sock **list, struct sock *sk)
|
| 919 |
|
|
{
|
| 920 |
|
|
write_lock_bh(&net_big_sklist_lock);
|
| 921 |
|
|
sk->next= *list;
|
| 922 |
|
|
*list=sk;
|
| 923 |
|
|
sock_hold(sk);
|
| 924 |
|
|
write_unlock_bh(&net_big_sklist_lock);
|
| 925 |
|
|
}
|
| 926 |
|
|
|
| 927 |
|
|
/*
|
| 928 |
|
|
* This is only called from user mode. Thus it protects itself against
|
| 929 |
|
|
* interrupt users but doesn't worry about being called during work.
|
| 930 |
|
|
* Once it is removed from the queue no interrupt or bottom half will
|
| 931 |
|
|
* touch it and we are (fairly 8-) ) safe.
|
| 932 |
|
|
*/
|
| 933 |
|
|
|
| 934 |
|
|
void sklist_destroy_socket(struct sock **list, struct sock *sk);
|
| 935 |
|
|
|
| 936 |
|
|
/*
|
| 937 |
|
|
* Handler for deferred kills.
|
| 938 |
|
|
*/
|
| 939 |
|
|
|
| 940 |
|
|
static void sklist_destroy_timer(unsigned long data)
|
| 941 |
|
|
{
|
| 942 |
|
|
struct sock *sk=(struct sock *)data;
|
| 943 |
|
|
sklist_destroy_socket(NULL,sk);
|
| 944 |
|
|
}
|
| 945 |
|
|
|
| 946 |
|
|
/*
|
| 947 |
|
|
* Destroy a socket. We pass NULL for a list if we know the
|
| 948 |
|
|
* socket is not on a list.
|
| 949 |
|
|
*/
|
| 950 |
|
|
|
| 951 |
|
|
void sklist_destroy_socket(struct sock **list,struct sock *sk)
|
| 952 |
|
|
{
|
| 953 |
|
|
if(list)
|
| 954 |
|
|
sklist_remove_socket(list, sk);
|
| 955 |
|
|
|
| 956 |
|
|
skb_queue_purge(&sk->receive_queue);
|
| 957 |
|
|
|
| 958 |
|
|
if(atomic_read(&sk->wmem_alloc) == 0 &&
|
| 959 |
|
|
atomic_read(&sk->rmem_alloc) == 0 &&
|
| 960 |
|
|
sk->dead)
|
| 961 |
|
|
{
|
| 962 |
|
|
sock_put(sk);
|
| 963 |
|
|
}
|
| 964 |
|
|
else
|
| 965 |
|
|
{
|
| 966 |
|
|
/*
|
| 967 |
|
|
* Someone is using our buffers still.. defer
|
| 968 |
|
|
*/
|
| 969 |
|
|
init_timer(&sk->timer);
|
| 970 |
|
|
sk->timer.expires=jiffies+SOCK_DESTROY_TIME;
|
| 971 |
|
|
sk->timer.function=sklist_destroy_timer;
|
| 972 |
|
|
sk->timer.data = (unsigned long)sk;
|
| 973 |
|
|
add_timer(&sk->timer);
|
| 974 |
|
|
}
|
| 975 |
|
|
}
|
| 976 |
|
|
|
| 977 |
|
|
/*
|
| 978 |
|
|
* Set of default routines for initialising struct proto_ops when
|
| 979 |
|
|
* the protocol does not support a particular function. In certain
|
| 980 |
|
|
* cases where it makes no sense for a protocol to have a "do nothing"
|
| 981 |
|
|
* function, some default processing is provided.
|
| 982 |
|
|
*/
|
| 983 |
|
|
|
| 984 |
|
|
int sock_no_release(struct socket *sock)
|
| 985 |
|
|
{
|
| 986 |
|
|
return 0;
|
| 987 |
|
|
}
|
| 988 |
|
|
|
| 989 |
|
|
int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
|
| 990 |
|
|
{
|
| 991 |
|
|
return -EOPNOTSUPP;
|
| 992 |
|
|
}
|
| 993 |
|
|
|
| 994 |
|
|
int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
|
| 995 |
|
|
int len, int flags)
|
| 996 |
|
|
{
|
| 997 |
|
|
return -EOPNOTSUPP;
|
| 998 |
|
|
}
|
| 999 |
|
|
|
| 1000 |
|
|
int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
|
| 1001 |
|
|
{
|
| 1002 |
|
|
return -EOPNOTSUPP;
|
| 1003 |
|
|
}
|
| 1004 |
|
|
|
| 1005 |
|
|
int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
|
| 1006 |
|
|
{
|
| 1007 |
|
|
return -EOPNOTSUPP;
|
| 1008 |
|
|
}
|
| 1009 |
|
|
|
| 1010 |
|
|
int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
|
| 1011 |
|
|
int *len, int peer)
|
| 1012 |
|
|
{
|
| 1013 |
|
|
return -EOPNOTSUPP;
|
| 1014 |
|
|
}
|
| 1015 |
|
|
|
| 1016 |
|
|
unsigned int sock_no_poll(struct file * file, struct socket *sock, poll_table *pt)
|
| 1017 |
|
|
{
|
| 1018 |
|
|
return 0;
|
| 1019 |
|
|
}
|
| 1020 |
|
|
|
| 1021 |
|
|
int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
|
| 1022 |
|
|
{
|
| 1023 |
|
|
return -EOPNOTSUPP;
|
| 1024 |
|
|
}
|
| 1025 |
|
|
|
| 1026 |
|
|
int sock_no_listen(struct socket *sock, int backlog)
|
| 1027 |
|
|
{
|
| 1028 |
|
|
return -EOPNOTSUPP;
|
| 1029 |
|
|
}
|
| 1030 |
|
|
|
| 1031 |
|
|
int sock_no_shutdown(struct socket *sock, int how)
|
| 1032 |
|
|
{
|
| 1033 |
|
|
return -EOPNOTSUPP;
|
| 1034 |
|
|
}
|
| 1035 |
|
|
|
| 1036 |
|
|
int sock_no_setsockopt(struct socket *sock, int level, int optname,
|
| 1037 |
|
|
char *optval, int optlen)
|
| 1038 |
|
|
{
|
| 1039 |
|
|
return -EOPNOTSUPP;
|
| 1040 |
|
|
}
|
| 1041 |
|
|
|
| 1042 |
|
|
int sock_no_getsockopt(struct socket *sock, int level, int optname,
|
| 1043 |
|
|
char *optval, int *optlen)
|
| 1044 |
|
|
{
|
| 1045 |
|
|
return -EOPNOTSUPP;
|
| 1046 |
|
|
}
|
| 1047 |
|
|
|
| 1048 |
|
|
/*
|
| 1049 |
|
|
* Note: if you add something that sleeps here then change sock_fcntl()
|
| 1050 |
|
|
* to do proper fd locking.
|
| 1051 |
|
|
*/
|
| 1052 |
|
|
int sock_no_fcntl(struct socket *sock, unsigned int cmd, unsigned long arg)
|
| 1053 |
|
|
{
|
| 1054 |
|
|
struct sock *sk = sock->sk;
|
| 1055 |
|
|
|
| 1056 |
|
|
switch(cmd)
|
| 1057 |
|
|
{
|
| 1058 |
|
|
case F_SETOWN:
|
| 1059 |
|
|
/*
|
| 1060 |
|
|
* This is a little restrictive, but it's the only
|
| 1061 |
|
|
* way to make sure that you can't send a sigurg to
|
| 1062 |
|
|
* another process.
|
| 1063 |
|
|
*/
|
| 1064 |
|
|
if (current->pgrp != -arg &&
|
| 1065 |
|
|
current->pid != arg &&
|
| 1066 |
|
|
!capable(CAP_KILL)) return(-EPERM);
|
| 1067 |
|
|
sk->proc = arg;
|
| 1068 |
|
|
return(0);
|
| 1069 |
|
|
case F_GETOWN:
|
| 1070 |
|
|
return(sk->proc);
|
| 1071 |
|
|
default:
|
| 1072 |
|
|
return(-EINVAL);
|
| 1073 |
|
|
}
|
| 1074 |
|
|
}
|
| 1075 |
|
|
|
| 1076 |
|
|
int sock_no_sendmsg(struct socket *sock, struct msghdr *m, int flags,
|
| 1077 |
|
|
struct scm_cookie *scm)
|
| 1078 |
|
|
{
|
| 1079 |
|
|
return -EOPNOTSUPP;
|
| 1080 |
|
|
}
|
| 1081 |
|
|
|
| 1082 |
|
|
int sock_no_recvmsg(struct socket *sock, struct msghdr *m, int len, int flags,
|
| 1083 |
|
|
struct scm_cookie *scm)
|
| 1084 |
|
|
{
|
| 1085 |
|
|
return -EOPNOTSUPP;
|
| 1086 |
|
|
}
|
| 1087 |
|
|
|
| 1088 |
|
|
int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
|
| 1089 |
|
|
{
|
| 1090 |
|
|
/* Mirror missing mmap method error code */
|
| 1091 |
|
|
return -ENODEV;
|
| 1092 |
|
|
}
|
| 1093 |
|
|
|
| 1094 |
|
|
ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
|
| 1095 |
|
|
{
|
| 1096 |
|
|
ssize_t res;
|
| 1097 |
|
|
struct msghdr msg;
|
| 1098 |
|
|
struct iovec iov;
|
| 1099 |
|
|
mm_segment_t old_fs;
|
| 1100 |
|
|
char *kaddr;
|
| 1101 |
|
|
|
| 1102 |
|
|
kaddr = kmap(page);
|
| 1103 |
|
|
|
| 1104 |
|
|
msg.msg_name = NULL;
|
| 1105 |
|
|
msg.msg_namelen = 0;
|
| 1106 |
|
|
msg.msg_iov = &iov;
|
| 1107 |
|
|
msg.msg_iovlen = 1;
|
| 1108 |
|
|
msg.msg_control = NULL;
|
| 1109 |
|
|
msg.msg_controllen = 0;
|
| 1110 |
|
|
msg.msg_flags = flags;
|
| 1111 |
|
|
|
| 1112 |
|
|
iov.iov_base = kaddr + offset;
|
| 1113 |
|
|
iov.iov_len = size;
|
| 1114 |
|
|
|
| 1115 |
|
|
old_fs = get_fs();
|
| 1116 |
|
|
set_fs(KERNEL_DS);
|
| 1117 |
|
|
res = sock_sendmsg(sock, &msg, size);
|
| 1118 |
|
|
set_fs(old_fs);
|
| 1119 |
|
|
|
| 1120 |
|
|
kunmap(page);
|
| 1121 |
|
|
return res;
|
| 1122 |
|
|
}
|
| 1123 |
|
|
|
| 1124 |
|
|
/*
|
| 1125 |
|
|
* Default Socket Callbacks
|
| 1126 |
|
|
*/
|
| 1127 |
|
|
|
| 1128 |
|
|
void sock_def_wakeup(struct sock *sk)
|
| 1129 |
|
|
{
|
| 1130 |
|
|
read_lock(&sk->callback_lock);
|
| 1131 |
|
|
if (sk->sleep && waitqueue_active(sk->sleep))
|
| 1132 |
|
|
wake_up_interruptible_all(sk->sleep);
|
| 1133 |
|
|
read_unlock(&sk->callback_lock);
|
| 1134 |
|
|
}
|
| 1135 |
|
|
|
| 1136 |
|
|
void sock_def_error_report(struct sock *sk)
|
| 1137 |
|
|
{
|
| 1138 |
|
|
read_lock(&sk->callback_lock);
|
| 1139 |
|
|
if (sk->sleep && waitqueue_active(sk->sleep))
|
| 1140 |
|
|
wake_up_interruptible(sk->sleep);
|
| 1141 |
|
|
sk_wake_async(sk,0,POLL_ERR);
|
| 1142 |
|
|
read_unlock(&sk->callback_lock);
|
| 1143 |
|
|
}
|
| 1144 |
|
|
|
| 1145 |
|
|
void sock_def_readable(struct sock *sk, int len)
|
| 1146 |
|
|
{
|
| 1147 |
|
|
read_lock(&sk->callback_lock);
|
| 1148 |
|
|
if (sk->sleep && waitqueue_active(sk->sleep))
|
| 1149 |
|
|
wake_up_interruptible(sk->sleep);
|
| 1150 |
|
|
sk_wake_async(sk,1,POLL_IN);
|
| 1151 |
|
|
read_unlock(&sk->callback_lock);
|
| 1152 |
|
|
}
|
| 1153 |
|
|
|
| 1154 |
|
|
void sock_def_write_space(struct sock *sk)
|
| 1155 |
|
|
{
|
| 1156 |
|
|
read_lock(&sk->callback_lock);
|
| 1157 |
|
|
|
| 1158 |
|
|
/* Do not wake up a writer until he can make "significant"
|
| 1159 |
|
|
* progress. --DaveM
|
| 1160 |
|
|
*/
|
| 1161 |
|
|
if((atomic_read(&sk->wmem_alloc) << 1) <= sk->sndbuf) {
|
| 1162 |
|
|
if (sk->sleep && waitqueue_active(sk->sleep))
|
| 1163 |
|
|
wake_up_interruptible(sk->sleep);
|
| 1164 |
|
|
|
| 1165 |
|
|
/* Should agree with poll, otherwise some programs break */
|
| 1166 |
|
|
if (sock_writeable(sk))
|
| 1167 |
|
|
sk_wake_async(sk, 2, POLL_OUT);
|
| 1168 |
|
|
}
|
| 1169 |
|
|
|
| 1170 |
|
|
read_unlock(&sk->callback_lock);
|
| 1171 |
|
|
}
|
| 1172 |
|
|
|
| 1173 |
|
|
void sock_def_destruct(struct sock *sk)
|
| 1174 |
|
|
{
|
| 1175 |
|
|
if (sk->protinfo.destruct_hook)
|
| 1176 |
|
|
kfree(sk->protinfo.destruct_hook);
|
| 1177 |
|
|
}
|
| 1178 |
|
|
|
| 1179 |
|
|
void sock_init_data(struct socket *sock, struct sock *sk)
|
| 1180 |
|
|
{
|
| 1181 |
|
|
skb_queue_head_init(&sk->receive_queue);
|
| 1182 |
|
|
skb_queue_head_init(&sk->write_queue);
|
| 1183 |
|
|
skb_queue_head_init(&sk->error_queue);
|
| 1184 |
|
|
|
| 1185 |
|
|
init_timer(&sk->timer);
|
| 1186 |
|
|
|
| 1187 |
|
|
sk->allocation = GFP_KERNEL;
|
| 1188 |
|
|
sk->rcvbuf = sysctl_rmem_default;
|
| 1189 |
|
|
sk->sndbuf = sysctl_wmem_default;
|
| 1190 |
|
|
sk->state = TCP_CLOSE;
|
| 1191 |
|
|
sk->zapped = 1;
|
| 1192 |
|
|
sk->socket = sock;
|
| 1193 |
|
|
|
| 1194 |
|
|
if(sock)
|
| 1195 |
|
|
{
|
| 1196 |
|
|
sk->type = sock->type;
|
| 1197 |
|
|
sk->sleep = &sock->wait;
|
| 1198 |
|
|
sock->sk = sk;
|
| 1199 |
|
|
} else
|
| 1200 |
|
|
sk->sleep = NULL;
|
| 1201 |
|
|
|
| 1202 |
|
|
sk->dst_lock = RW_LOCK_UNLOCKED;
|
| 1203 |
|
|
sk->callback_lock = RW_LOCK_UNLOCKED;
|
| 1204 |
|
|
|
| 1205 |
|
|
sk->state_change = sock_def_wakeup;
|
| 1206 |
|
|
sk->data_ready = sock_def_readable;
|
| 1207 |
|
|
sk->write_space = sock_def_write_space;
|
| 1208 |
|
|
sk->error_report = sock_def_error_report;
|
| 1209 |
|
|
sk->destruct = sock_def_destruct;
|
| 1210 |
|
|
|
| 1211 |
|
|
sk->peercred.pid = 0;
|
| 1212 |
|
|
sk->peercred.uid = -1;
|
| 1213 |
|
|
sk->peercred.gid = -1;
|
| 1214 |
|
|
sk->rcvlowat = 1;
|
| 1215 |
|
|
sk->rcvtimeo = MAX_SCHEDULE_TIMEOUT;
|
| 1216 |
|
|
sk->sndtimeo = MAX_SCHEDULE_TIMEOUT;
|
| 1217 |
|
|
|
| 1218 |
|
|
atomic_set(&sk->refcnt, 1);
|
| 1219 |
|
|
}
|
