![Rami Rosen](/assets/img/avatar_default.png)
In sock_queue_rcv_skb() (net/core/sock.c) it should be: "Cast sk->rcvbuf ..." instead of: "Cast skb->rcvbuf ..." Signed-off-by: Rami Rosen <ramirose@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2279 lines
56 KiB
C
2279 lines
56 KiB
C
/*
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* INET An implementation of the TCP/IP protocol suite for the LINUX
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* operating system. INET is implemented using the BSD Socket
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* interface as the means of communication with the user level.
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*
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* Generic socket support routines. Memory allocators, socket lock/release
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* handler for protocols to use and generic option handler.
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*
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*
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* Version: $Id: sock.c,v 1.117 2002/02/01 22:01:03 davem Exp $
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*
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* Authors: Ross Biro
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* Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
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* Florian La Roche, <flla@stud.uni-sb.de>
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* Alan Cox, <A.Cox@swansea.ac.uk>
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*
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* Fixes:
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* Alan Cox : Numerous verify_area() problems
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* Alan Cox : Connecting on a connecting socket
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* now returns an error for tcp.
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* Alan Cox : sock->protocol is set correctly.
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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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* connect properly. Unfortunately there
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* is a restart syscall nasty there. I
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* can't match BSD without hacking the C
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* library. Ideas urgently sought!
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* Alan Cox : Disallow bind() to addresses that are
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* not ours - especially broadcast ones!!
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* Alan Cox : Socket 1024 _IS_ ok for users. (fencepost)
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* Alan Cox : sock_wfree/sock_rfree don't destroy sockets,
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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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* was buggy. Put a remove_sock() in the handler
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* for memory when we hit 0. Also altered the timer
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* code. The ACK stuff can wait and needs major
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* TCP layer surgery.
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* Alan Cox : Fixed TCP ack bug, removed remove sock
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* and fixed timer/inet_bh race.
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* Alan Cox : Added zapped flag for TCP
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* Alan Cox : Move kfree_skb into skbuff.c and tidied up surplus code
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* Alan Cox : for new sk_buff allocations wmalloc/rmalloc now call alloc_skb
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* Alan Cox : kfree_s calls now are kfree_skbmem so we can track skb resources
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* Alan Cox : Supports socket option broadcast now as does udp. Packet and raw need fixing.
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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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* Rick Sladkey : Relaxed UDP rules for matching packets.
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* C.E.Hawkins : IFF_PROMISC/SIOCGHWADDR support
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* Pauline Middelink : identd support
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* Alan Cox : Fixed connect() taking signals I think.
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* Alan Cox : SO_LINGER supported
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* Alan Cox : Error reporting fixes
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* Anonymous : inet_create tidied up (sk->reuse setting)
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* Alan Cox : inet sockets don't set sk->type!
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* Alan Cox : Split socket option code
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* Alan Cox : Callbacks
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* Alan Cox : Nagle flag for Charles & Johannes stuff
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* Alex : Removed restriction on inet fioctl
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* Alan Cox : Splitting INET from NET core
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* Alan Cox : Fixed bogus SO_TYPE handling in getsockopt()
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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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* Alan Cox : New kfree_skbmem()
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* Alan Cox : Make SO_DEBUG superuser only.
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* Alan Cox : Allow anyone to clear SO_DEBUG
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* (compatibility fix)
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* Alan Cox : Added optimistic memory grabbing for AF_UNIX throughput.
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* Alan Cox : Allocator for a socket is settable.
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* Alan Cox : SO_ERROR includes soft errors.
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* Alan Cox : Allow NULL arguments on some SO_ opts
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* Alan Cox : Generic socket allocation to make hooks
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* easier (suggested by Craig Metz).
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* Michael Pall : SO_ERROR returns positive errno again
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* Steve Whitehouse: Added default destructor to free
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* protocol private data.
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* Steve Whitehouse: Added various other default routines
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* common to several socket families.
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* Chris Evans : Call suser() check last on F_SETOWN
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* Jay Schulist : Added SO_ATTACH_FILTER and SO_DETACH_FILTER.
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* Andi Kleen : Add sock_kmalloc()/sock_kfree_s()
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* Andi Kleen : Fix write_space callback
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* Chris Evans : Security fixes - signedness again
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* Arnaldo C. Melo : cleanups, use skb_queue_purge
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*
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* To Fix:
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*
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/capability.h>
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#include <linux/errno.h>
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#include <linux/types.h>
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#include <linux/socket.h>
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#include <linux/in.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <linux/sched.h>
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#include <linux/timer.h>
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#include <linux/string.h>
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#include <linux/sockios.h>
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#include <linux/net.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <linux/interrupt.h>
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#include <linux/poll.h>
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#include <linux/tcp.h>
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#include <linux/init.h>
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#include <linux/highmem.h>
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#include <asm/uaccess.h>
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#include <asm/system.h>
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#include <linux/netdevice.h>
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#include <net/protocol.h>
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#include <linux/skbuff.h>
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#include <net/net_namespace.h>
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#include <net/request_sock.h>
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#include <net/sock.h>
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#include <net/xfrm.h>
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#include <linux/ipsec.h>
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#include <linux/filter.h>
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#ifdef CONFIG_INET
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#include <net/tcp.h>
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#endif
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/*
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* Each address family might have different locking rules, so we have
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* one slock key per address family:
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*/
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static struct lock_class_key af_family_keys[AF_MAX];
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static struct lock_class_key af_family_slock_keys[AF_MAX];
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#ifdef CONFIG_DEBUG_LOCK_ALLOC
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/*
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* Make lock validator output more readable. (we pre-construct these
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* strings build-time, so that runtime initialization of socket
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* locks is fast):
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*/
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static const char *af_family_key_strings[AF_MAX+1] = {
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"sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" ,
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"sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK",
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"sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" ,
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"sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" ,
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"sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" ,
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"sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" ,
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"sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" ,
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"sk_lock-21" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" ,
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"sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" ,
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"sk_lock-27" , "sk_lock-28" , "sk_lock-AF_CAN" ,
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"sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" ,
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"sk_lock-AF_RXRPC" , "sk_lock-AF_MAX"
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};
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static const char *af_family_slock_key_strings[AF_MAX+1] = {
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"slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" ,
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"slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK",
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"slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" ,
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"slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" ,
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"slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" ,
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"slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" ,
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"slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" ,
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"slock-21" , "slock-AF_SNA" , "slock-AF_IRDA" ,
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"slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" ,
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"slock-27" , "slock-28" , "slock-AF_CAN" ,
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"slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" ,
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"slock-AF_RXRPC" , "slock-AF_MAX"
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};
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static const char *af_family_clock_key_strings[AF_MAX+1] = {
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"clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" ,
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"clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK",
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"clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" ,
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"clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" ,
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"clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" ,
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"clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" ,
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"clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" ,
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"clock-21" , "clock-AF_SNA" , "clock-AF_IRDA" ,
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"clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" ,
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"clock-27" , "clock-28" , "clock-29" ,
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"clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" ,
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"clock-AF_RXRPC" , "clock-AF_MAX"
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};
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#endif
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/*
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* sk_callback_lock locking rules are per-address-family,
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* so split the lock classes by using a per-AF key:
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*/
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static struct lock_class_key af_callback_keys[AF_MAX];
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/* Take into consideration the size of the struct sk_buff overhead in the
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* determination of these values, since that is non-constant across
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* platforms. This makes socket queueing behavior and performance
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* not depend upon such differences.
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*/
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#define _SK_MEM_PACKETS 256
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#define _SK_MEM_OVERHEAD (sizeof(struct sk_buff) + 256)
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#define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
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#define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
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/* Run time adjustable parameters. */
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__u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
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__u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
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__u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
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__u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
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/* Maximal space eaten by iovec or ancilliary data plus some space */
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int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
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static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen)
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{
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struct timeval tv;
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if (optlen < sizeof(tv))
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return -EINVAL;
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if (copy_from_user(&tv, optval, sizeof(tv)))
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return -EFAULT;
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if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
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return -EDOM;
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if (tv.tv_sec < 0) {
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static int warned __read_mostly;
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*timeo_p = 0;
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if (warned < 10 && net_ratelimit()) {
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warned++;
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printk(KERN_INFO "sock_set_timeout: `%s' (pid %d) "
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"tries to set negative timeout\n",
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current->comm, task_pid_nr(current));
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}
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return 0;
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}
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*timeo_p = MAX_SCHEDULE_TIMEOUT;
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if (tv.tv_sec == 0 && tv.tv_usec == 0)
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return 0;
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if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1))
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*timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ);
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return 0;
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}
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|
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static void sock_warn_obsolete_bsdism(const char *name)
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{
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static int warned;
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static char warncomm[TASK_COMM_LEN];
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if (strcmp(warncomm, current->comm) && warned < 5) {
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strcpy(warncomm, current->comm);
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printk(KERN_WARNING "process `%s' is using obsolete "
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"%s SO_BSDCOMPAT\n", warncomm, name);
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warned++;
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}
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}
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static void sock_disable_timestamp(struct sock *sk)
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{
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if (sock_flag(sk, SOCK_TIMESTAMP)) {
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sock_reset_flag(sk, SOCK_TIMESTAMP);
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net_disable_timestamp();
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}
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}
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|
|
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int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
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{
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int err = 0;
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int skb_len;
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|
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/* Cast sk->rcvbuf to unsigned... It's pointless, but reduces
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number of warnings when compiling with -W --ANK
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*/
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if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >=
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(unsigned)sk->sk_rcvbuf) {
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err = -ENOMEM;
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goto out;
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}
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err = sk_filter(sk, skb);
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if (err)
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goto out;
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if (!sk_rmem_schedule(sk, skb->truesize)) {
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err = -ENOBUFS;
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goto out;
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}
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skb->dev = NULL;
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skb_set_owner_r(skb, sk);
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|
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/* Cache the SKB length before we tack it onto the receive
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* queue. Once it is added it no longer belongs to us and
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* may be freed by other threads of control pulling packets
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* from the queue.
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*/
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skb_len = skb->len;
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skb_queue_tail(&sk->sk_receive_queue, skb);
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if (!sock_flag(sk, SOCK_DEAD))
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sk->sk_data_ready(sk, skb_len);
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out:
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return err;
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}
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EXPORT_SYMBOL(sock_queue_rcv_skb);
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int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested)
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{
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int rc = NET_RX_SUCCESS;
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|
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if (sk_filter(sk, skb))
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goto discard_and_relse;
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skb->dev = NULL;
|
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|
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if (nested)
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bh_lock_sock_nested(sk);
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else
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bh_lock_sock(sk);
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if (!sock_owned_by_user(sk)) {
|
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/*
|
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* trylock + unlock semantics:
|
|
*/
|
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mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
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|
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rc = sk->sk_backlog_rcv(sk, skb);
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|
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mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
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} else
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sk_add_backlog(sk, skb);
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bh_unlock_sock(sk);
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out:
|
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sock_put(sk);
|
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return rc;
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discard_and_relse:
|
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kfree_skb(skb);
|
|
goto out;
|
|
}
|
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EXPORT_SYMBOL(sk_receive_skb);
|
|
|
|
struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
|
|
{
|
|
struct dst_entry *dst = sk->sk_dst_cache;
|
|
|
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if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
|
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sk->sk_dst_cache = NULL;
|
|
dst_release(dst);
|
|
return NULL;
|
|
}
|
|
|
|
return dst;
|
|
}
|
|
EXPORT_SYMBOL(__sk_dst_check);
|
|
|
|
struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
|
|
{
|
|
struct dst_entry *dst = sk_dst_get(sk);
|
|
|
|
if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
|
|
sk_dst_reset(sk);
|
|
dst_release(dst);
|
|
return NULL;
|
|
}
|
|
|
|
return dst;
|
|
}
|
|
EXPORT_SYMBOL(sk_dst_check);
|
|
|
|
static int sock_bindtodevice(struct sock *sk, char __user *optval, int optlen)
|
|
{
|
|
int ret = -ENOPROTOOPT;
|
|
#ifdef CONFIG_NETDEVICES
|
|
struct net *net = sock_net(sk);
|
|
char devname[IFNAMSIZ];
|
|
int index;
|
|
|
|
/* Sorry... */
|
|
ret = -EPERM;
|
|
if (!capable(CAP_NET_RAW))
|
|
goto out;
|
|
|
|
ret = -EINVAL;
|
|
if (optlen < 0)
|
|
goto out;
|
|
|
|
/* 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.
|
|
*/
|
|
if (optlen > IFNAMSIZ - 1)
|
|
optlen = IFNAMSIZ - 1;
|
|
memset(devname, 0, sizeof(devname));
|
|
|
|
ret = -EFAULT;
|
|
if (copy_from_user(devname, optval, optlen))
|
|
goto out;
|
|
|
|
if (devname[0] == '\0') {
|
|
index = 0;
|
|
} else {
|
|
struct net_device *dev = dev_get_by_name(net, devname);
|
|
|
|
ret = -ENODEV;
|
|
if (!dev)
|
|
goto out;
|
|
|
|
index = dev->ifindex;
|
|
dev_put(dev);
|
|
}
|
|
|
|
lock_sock(sk);
|
|
sk->sk_bound_dev_if = index;
|
|
sk_dst_reset(sk);
|
|
release_sock(sk);
|
|
|
|
ret = 0;
|
|
|
|
out:
|
|
#endif
|
|
|
|
return ret;
|
|
}
|
|
|
|
static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
|
|
{
|
|
if (valbool)
|
|
sock_set_flag(sk, bit);
|
|
else
|
|
sock_reset_flag(sk, bit);
|
|
}
|
|
|
|
/*
|
|
* This is meant for all protocols to use and covers goings on
|
|
* at the socket level. Everything here is generic.
|
|
*/
|
|
|
|
int sock_setsockopt(struct socket *sock, int level, int optname,
|
|
char __user *optval, int optlen)
|
|
{
|
|
struct sock *sk=sock->sk;
|
|
int val;
|
|
int valbool;
|
|
struct linger ling;
|
|
int ret = 0;
|
|
|
|
/*
|
|
* Options without arguments
|
|
*/
|
|
|
|
if (optname == SO_BINDTODEVICE)
|
|
return sock_bindtodevice(sk, optval, optlen);
|
|
|
|
if (optlen < sizeof(int))
|
|
return -EINVAL;
|
|
|
|
if (get_user(val, (int __user *)optval))
|
|
return -EFAULT;
|
|
|
|
valbool = val?1:0;
|
|
|
|
lock_sock(sk);
|
|
|
|
switch(optname) {
|
|
case SO_DEBUG:
|
|
if (val && !capable(CAP_NET_ADMIN)) {
|
|
ret = -EACCES;
|
|
} else
|
|
sock_valbool_flag(sk, SOCK_DBG, valbool);
|
|
break;
|
|
case SO_REUSEADDR:
|
|
sk->sk_reuse = valbool;
|
|
break;
|
|
case SO_TYPE:
|
|
case SO_ERROR:
|
|
ret = -ENOPROTOOPT;
|
|
break;
|
|
case SO_DONTROUTE:
|
|
sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
|
|
break;
|
|
case SO_BROADCAST:
|
|
sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
|
|
break;
|
|
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 */
|
|
|
|
if (val > sysctl_wmem_max)
|
|
val = sysctl_wmem_max;
|
|
set_sndbuf:
|
|
sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
|
|
if ((val * 2) < SOCK_MIN_SNDBUF)
|
|
sk->sk_sndbuf = SOCK_MIN_SNDBUF;
|
|
else
|
|
sk->sk_sndbuf = val * 2;
|
|
|
|
/*
|
|
* Wake up sending tasks if we
|
|
* upped the value.
|
|
*/
|
|
sk->sk_write_space(sk);
|
|
break;
|
|
|
|
case SO_SNDBUFFORCE:
|
|
if (!capable(CAP_NET_ADMIN)) {
|
|
ret = -EPERM;
|
|
break;
|
|
}
|
|
goto set_sndbuf;
|
|
|
|
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 */
|
|
|
|
if (val > sysctl_rmem_max)
|
|
val = sysctl_rmem_max;
|
|
set_rcvbuf:
|
|
sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
|
|
/*
|
|
* We double it on the way in to account for
|
|
* "struct sk_buff" etc. overhead. Applications
|
|
* assume that the SO_RCVBUF setting they make will
|
|
* allow that much actual data to be received on that
|
|
* socket.
|
|
*
|
|
* Applications are unaware that "struct sk_buff" and
|
|
* other overheads allocate from the receive buffer
|
|
* during socket buffer allocation.
|
|
*
|
|
* And after considering the possible alternatives,
|
|
* returning the value we actually used in getsockopt
|
|
* is the most desirable behavior.
|
|
*/
|
|
if ((val * 2) < SOCK_MIN_RCVBUF)
|
|
sk->sk_rcvbuf = SOCK_MIN_RCVBUF;
|
|
else
|
|
sk->sk_rcvbuf = val * 2;
|
|
break;
|
|
|
|
case SO_RCVBUFFORCE:
|
|
if (!capable(CAP_NET_ADMIN)) {
|
|
ret = -EPERM;
|
|
break;
|
|
}
|
|
goto set_rcvbuf;
|
|
|
|
case SO_KEEPALIVE:
|
|
#ifdef CONFIG_INET
|
|
if (sk->sk_protocol == IPPROTO_TCP)
|
|
tcp_set_keepalive(sk, valbool);
|
|
#endif
|
|
sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
|
|
break;
|
|
|
|
case SO_OOBINLINE:
|
|
sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
|
|
break;
|
|
|
|
case SO_NO_CHECK:
|
|
sk->sk_no_check = valbool;
|
|
break;
|
|
|
|
case SO_PRIORITY:
|
|
if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN))
|
|
sk->sk_priority = val;
|
|
else
|
|
ret = -EPERM;
|
|
break;
|
|
|
|
case SO_LINGER:
|
|
if (optlen < sizeof(ling)) {
|
|
ret = -EINVAL; /* 1003.1g */
|
|
break;
|
|
}
|
|
if (copy_from_user(&ling,optval,sizeof(ling))) {
|
|
ret = -EFAULT;
|
|
break;
|
|
}
|
|
if (!ling.l_onoff)
|
|
sock_reset_flag(sk, SOCK_LINGER);
|
|
else {
|
|
#if (BITS_PER_LONG == 32)
|
|
if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
|
|
sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
|
|
else
|
|
#endif
|
|
sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
|
|
sock_set_flag(sk, SOCK_LINGER);
|
|
}
|
|
break;
|
|
|
|
case SO_BSDCOMPAT:
|
|
sock_warn_obsolete_bsdism("setsockopt");
|
|
break;
|
|
|
|
case SO_PASSCRED:
|
|
if (valbool)
|
|
set_bit(SOCK_PASSCRED, &sock->flags);
|
|
else
|
|
clear_bit(SOCK_PASSCRED, &sock->flags);
|
|
break;
|
|
|
|
case SO_TIMESTAMP:
|
|
case SO_TIMESTAMPNS:
|
|
if (valbool) {
|
|
if (optname == SO_TIMESTAMP)
|
|
sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
|
|
else
|
|
sock_set_flag(sk, SOCK_RCVTSTAMPNS);
|
|
sock_set_flag(sk, SOCK_RCVTSTAMP);
|
|
sock_enable_timestamp(sk);
|
|
} else {
|
|
sock_reset_flag(sk, SOCK_RCVTSTAMP);
|
|
sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
|
|
}
|
|
break;
|
|
|
|
case SO_RCVLOWAT:
|
|
if (val < 0)
|
|
val = INT_MAX;
|
|
sk->sk_rcvlowat = val ? : 1;
|
|
break;
|
|
|
|
case SO_RCVTIMEO:
|
|
ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
|
|
break;
|
|
|
|
case SO_SNDTIMEO:
|
|
ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
|
|
break;
|
|
|
|
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:
|
|
ret = sk_detach_filter(sk);
|
|
break;
|
|
|
|
case SO_PASSSEC:
|
|
if (valbool)
|
|
set_bit(SOCK_PASSSEC, &sock->flags);
|
|
else
|
|
clear_bit(SOCK_PASSSEC, &sock->flags);
|
|
break;
|
|
case SO_MARK:
|
|
if (!capable(CAP_NET_ADMIN))
|
|
ret = -EPERM;
|
|
else {
|
|
sk->sk_mark = val;
|
|
}
|
|
break;
|
|
|
|
/* We implement the SO_SNDLOWAT etc to
|
|
not be settable (1003.1g 5.3) */
|
|
default:
|
|
ret = -ENOPROTOOPT;
|
|
break;
|
|
}
|
|
release_sock(sk);
|
|
return ret;
|
|
}
|
|
|
|
|
|
int sock_getsockopt(struct socket *sock, int level, int optname,
|
|
char __user *optval, int __user *optlen)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
|
|
union {
|
|
int val;
|
|
struct linger ling;
|
|
struct timeval tm;
|
|
} v;
|
|
|
|
unsigned int lv = sizeof(int);
|
|
int len;
|
|
|
|
if (get_user(len, optlen))
|
|
return -EFAULT;
|
|
if (len < 0)
|
|
return -EINVAL;
|
|
|
|
switch(optname) {
|
|
case SO_DEBUG:
|
|
v.val = sock_flag(sk, SOCK_DBG);
|
|
break;
|
|
|
|
case SO_DONTROUTE:
|
|
v.val = sock_flag(sk, SOCK_LOCALROUTE);
|
|
break;
|
|
|
|
case SO_BROADCAST:
|
|
v.val = !!sock_flag(sk, SOCK_BROADCAST);
|
|
break;
|
|
|
|
case SO_SNDBUF:
|
|
v.val = sk->sk_sndbuf;
|
|
break;
|
|
|
|
case SO_RCVBUF:
|
|
v.val = sk->sk_rcvbuf;
|
|
break;
|
|
|
|
case SO_REUSEADDR:
|
|
v.val = sk->sk_reuse;
|
|
break;
|
|
|
|
case SO_KEEPALIVE:
|
|
v.val = !!sock_flag(sk, SOCK_KEEPOPEN);
|
|
break;
|
|
|
|
case SO_TYPE:
|
|
v.val = sk->sk_type;
|
|
break;
|
|
|
|
case SO_ERROR:
|
|
v.val = -sock_error(sk);
|
|
if (v.val==0)
|
|
v.val = xchg(&sk->sk_err_soft, 0);
|
|
break;
|
|
|
|
case SO_OOBINLINE:
|
|
v.val = !!sock_flag(sk, SOCK_URGINLINE);
|
|
break;
|
|
|
|
case SO_NO_CHECK:
|
|
v.val = sk->sk_no_check;
|
|
break;
|
|
|
|
case SO_PRIORITY:
|
|
v.val = sk->sk_priority;
|
|
break;
|
|
|
|
case SO_LINGER:
|
|
lv = sizeof(v.ling);
|
|
v.ling.l_onoff = !!sock_flag(sk, SOCK_LINGER);
|
|
v.ling.l_linger = sk->sk_lingertime / HZ;
|
|
break;
|
|
|
|
case SO_BSDCOMPAT:
|
|
sock_warn_obsolete_bsdism("getsockopt");
|
|
break;
|
|
|
|
case SO_TIMESTAMP:
|
|
v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
|
|
!sock_flag(sk, SOCK_RCVTSTAMPNS);
|
|
break;
|
|
|
|
case SO_TIMESTAMPNS:
|
|
v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
|
|
break;
|
|
|
|
case SO_RCVTIMEO:
|
|
lv=sizeof(struct timeval);
|
|
if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
|
|
v.tm.tv_sec = 0;
|
|
v.tm.tv_usec = 0;
|
|
} else {
|
|
v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
|
|
v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
|
|
}
|
|
break;
|
|
|
|
case SO_SNDTIMEO:
|
|
lv=sizeof(struct timeval);
|
|
if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
|
|
v.tm.tv_sec = 0;
|
|
v.tm.tv_usec = 0;
|
|
} else {
|
|
v.tm.tv_sec = sk->sk_sndtimeo / HZ;
|
|
v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
|
|
}
|
|
break;
|
|
|
|
case SO_RCVLOWAT:
|
|
v.val = sk->sk_rcvlowat;
|
|
break;
|
|
|
|
case SO_SNDLOWAT:
|
|
v.val=1;
|
|
break;
|
|
|
|
case SO_PASSCRED:
|
|
v.val = test_bit(SOCK_PASSCRED, &sock->flags) ? 1 : 0;
|
|
break;
|
|
|
|
case SO_PEERCRED:
|
|
if (len > sizeof(sk->sk_peercred))
|
|
len = sizeof(sk->sk_peercred);
|
|
if (copy_to_user(optval, &sk->sk_peercred, len))
|
|
return -EFAULT;
|
|
goto lenout;
|
|
|
|
case SO_PEERNAME:
|
|
{
|
|
char address[128];
|
|
|
|
if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
|
|
return -ENOTCONN;
|
|
if (lv < len)
|
|
return -EINVAL;
|
|
if (copy_to_user(optval, address, len))
|
|
return -EFAULT;
|
|
goto lenout;
|
|
}
|
|
|
|
/* Dubious BSD thing... Probably nobody even uses it, but
|
|
* the UNIX standard wants it for whatever reason... -DaveM
|
|
*/
|
|
case SO_ACCEPTCONN:
|
|
v.val = sk->sk_state == TCP_LISTEN;
|
|
break;
|
|
|
|
case SO_PASSSEC:
|
|
v.val = test_bit(SOCK_PASSSEC, &sock->flags) ? 1 : 0;
|
|
break;
|
|
|
|
case SO_PEERSEC:
|
|
return security_socket_getpeersec_stream(sock, optval, optlen, len);
|
|
|
|
case SO_MARK:
|
|
v.val = sk->sk_mark;
|
|
break;
|
|
|
|
default:
|
|
return -ENOPROTOOPT;
|
|
}
|
|
|
|
if (len > lv)
|
|
len = lv;
|
|
if (copy_to_user(optval, &v, len))
|
|
return -EFAULT;
|
|
lenout:
|
|
if (put_user(len, optlen))
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Initialize an sk_lock.
|
|
*
|
|
* (We also register the sk_lock with the lock validator.)
|
|
*/
|
|
static inline void sock_lock_init(struct sock *sk)
|
|
{
|
|
sock_lock_init_class_and_name(sk,
|
|
af_family_slock_key_strings[sk->sk_family],
|
|
af_family_slock_keys + sk->sk_family,
|
|
af_family_key_strings[sk->sk_family],
|
|
af_family_keys + sk->sk_family);
|
|
}
|
|
|
|
static void sock_copy(struct sock *nsk, const struct sock *osk)
|
|
{
|
|
#ifdef CONFIG_SECURITY_NETWORK
|
|
void *sptr = nsk->sk_security;
|
|
#endif
|
|
|
|
memcpy(nsk, osk, osk->sk_prot->obj_size);
|
|
#ifdef CONFIG_SECURITY_NETWORK
|
|
nsk->sk_security = sptr;
|
|
security_sk_clone(osk, nsk);
|
|
#endif
|
|
}
|
|
|
|
static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
|
|
int family)
|
|
{
|
|
struct sock *sk;
|
|
struct kmem_cache *slab;
|
|
|
|
slab = prot->slab;
|
|
if (slab != NULL)
|
|
sk = kmem_cache_alloc(slab, priority);
|
|
else
|
|
sk = kmalloc(prot->obj_size, priority);
|
|
|
|
if (sk != NULL) {
|
|
if (security_sk_alloc(sk, family, priority))
|
|
goto out_free;
|
|
|
|
if (!try_module_get(prot->owner))
|
|
goto out_free_sec;
|
|
}
|
|
|
|
return sk;
|
|
|
|
out_free_sec:
|
|
security_sk_free(sk);
|
|
out_free:
|
|
if (slab != NULL)
|
|
kmem_cache_free(slab, sk);
|
|
else
|
|
kfree(sk);
|
|
return NULL;
|
|
}
|
|
|
|
static void sk_prot_free(struct proto *prot, struct sock *sk)
|
|
{
|
|
struct kmem_cache *slab;
|
|
struct module *owner;
|
|
|
|
owner = prot->owner;
|
|
slab = prot->slab;
|
|
|
|
security_sk_free(sk);
|
|
if (slab != NULL)
|
|
kmem_cache_free(slab, sk);
|
|
else
|
|
kfree(sk);
|
|
module_put(owner);
|
|
}
|
|
|
|
/**
|
|
* sk_alloc - All socket objects are allocated here
|
|
* @net: the applicable net namespace
|
|
* @family: protocol family
|
|
* @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
|
|
* @prot: struct proto associated with this new sock instance
|
|
*/
|
|
struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
|
|
struct proto *prot)
|
|
{
|
|
struct sock *sk;
|
|
|
|
sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
|
|
if (sk) {
|
|
sk->sk_family = family;
|
|
/*
|
|
* See comment in struct sock definition to understand
|
|
* why we need sk_prot_creator -acme
|
|
*/
|
|
sk->sk_prot = sk->sk_prot_creator = prot;
|
|
sock_lock_init(sk);
|
|
sock_net_set(sk, get_net(net));
|
|
}
|
|
|
|
return sk;
|
|
}
|
|
|
|
void sk_free(struct sock *sk)
|
|
{
|
|
struct sk_filter *filter;
|
|
|
|
if (sk->sk_destruct)
|
|
sk->sk_destruct(sk);
|
|
|
|
filter = rcu_dereference(sk->sk_filter);
|
|
if (filter) {
|
|
sk_filter_uncharge(sk, filter);
|
|
rcu_assign_pointer(sk->sk_filter, NULL);
|
|
}
|
|
|
|
sock_disable_timestamp(sk);
|
|
|
|
if (atomic_read(&sk->sk_omem_alloc))
|
|
printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n",
|
|
__func__, atomic_read(&sk->sk_omem_alloc));
|
|
|
|
put_net(sock_net(sk));
|
|
sk_prot_free(sk->sk_prot_creator, sk);
|
|
}
|
|
|
|
/*
|
|
* Last sock_put should drop referrence to sk->sk_net. It has already
|
|
* been dropped in sk_change_net. Taking referrence to stopping namespace
|
|
* is not an option.
|
|
* Take referrence to a socket to remove it from hash _alive_ and after that
|
|
* destroy it in the context of init_net.
|
|
*/
|
|
void sk_release_kernel(struct sock *sk)
|
|
{
|
|
if (sk == NULL || sk->sk_socket == NULL)
|
|
return;
|
|
|
|
sock_hold(sk);
|
|
sock_release(sk->sk_socket);
|
|
release_net(sock_net(sk));
|
|
sock_net_set(sk, get_net(&init_net));
|
|
sock_put(sk);
|
|
}
|
|
EXPORT_SYMBOL(sk_release_kernel);
|
|
|
|
struct sock *sk_clone(const struct sock *sk, const gfp_t priority)
|
|
{
|
|
struct sock *newsk;
|
|
|
|
newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
|
|
if (newsk != NULL) {
|
|
struct sk_filter *filter;
|
|
|
|
sock_copy(newsk, sk);
|
|
|
|
/* SANITY */
|
|
get_net(sock_net(newsk));
|
|
sk_node_init(&newsk->sk_node);
|
|
sock_lock_init(newsk);
|
|
bh_lock_sock(newsk);
|
|
newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
|
|
|
|
atomic_set(&newsk->sk_rmem_alloc, 0);
|
|
atomic_set(&newsk->sk_wmem_alloc, 0);
|
|
atomic_set(&newsk->sk_omem_alloc, 0);
|
|
skb_queue_head_init(&newsk->sk_receive_queue);
|
|
skb_queue_head_init(&newsk->sk_write_queue);
|
|
#ifdef CONFIG_NET_DMA
|
|
skb_queue_head_init(&newsk->sk_async_wait_queue);
|
|
#endif
|
|
|
|
rwlock_init(&newsk->sk_dst_lock);
|
|
rwlock_init(&newsk->sk_callback_lock);
|
|
lockdep_set_class_and_name(&newsk->sk_callback_lock,
|
|
af_callback_keys + newsk->sk_family,
|
|
af_family_clock_key_strings[newsk->sk_family]);
|
|
|
|
newsk->sk_dst_cache = NULL;
|
|
newsk->sk_wmem_queued = 0;
|
|
newsk->sk_forward_alloc = 0;
|
|
newsk->sk_send_head = NULL;
|
|
newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
|
|
|
|
sock_reset_flag(newsk, SOCK_DONE);
|
|
skb_queue_head_init(&newsk->sk_error_queue);
|
|
|
|
filter = newsk->sk_filter;
|
|
if (filter != NULL)
|
|
sk_filter_charge(newsk, filter);
|
|
|
|
if (unlikely(xfrm_sk_clone_policy(newsk))) {
|
|
/* It is still raw copy of parent, so invalidate
|
|
* destructor and make plain sk_free() */
|
|
newsk->sk_destruct = NULL;
|
|
sk_free(newsk);
|
|
newsk = NULL;
|
|
goto out;
|
|
}
|
|
|
|
newsk->sk_err = 0;
|
|
newsk->sk_priority = 0;
|
|
atomic_set(&newsk->sk_refcnt, 2);
|
|
|
|
/*
|
|
* Increment the counter in the same struct proto as the master
|
|
* sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
|
|
* is the same as sk->sk_prot->socks, as this field was copied
|
|
* with memcpy).
|
|
*
|
|
* This _changes_ the previous behaviour, where
|
|
* tcp_create_openreq_child always was incrementing the
|
|
* equivalent to tcp_prot->socks (inet_sock_nr), so this have
|
|
* to be taken into account in all callers. -acme
|
|
*/
|
|
sk_refcnt_debug_inc(newsk);
|
|
newsk->sk_socket = NULL;
|
|
newsk->sk_sleep = NULL;
|
|
|
|
if (newsk->sk_prot->sockets_allocated)
|
|
atomic_inc(newsk->sk_prot->sockets_allocated);
|
|
}
|
|
out:
|
|
return newsk;
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(sk_clone);
|
|
|
|
void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
|
|
{
|
|
__sk_dst_set(sk, dst);
|
|
sk->sk_route_caps = dst->dev->features;
|
|
if (sk->sk_route_caps & NETIF_F_GSO)
|
|
sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
|
|
if (sk_can_gso(sk)) {
|
|
if (dst->header_len) {
|
|
sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
|
|
} else {
|
|
sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
|
|
sk->sk_gso_max_size = dst->dev->gso_max_size;
|
|
}
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(sk_setup_caps);
|
|
|
|
void __init sk_init(void)
|
|
{
|
|
if (num_physpages <= 4096) {
|
|
sysctl_wmem_max = 32767;
|
|
sysctl_rmem_max = 32767;
|
|
sysctl_wmem_default = 32767;
|
|
sysctl_rmem_default = 32767;
|
|
} 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.
|
|
*/
|
|
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->sk_wmem_alloc);
|
|
if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE))
|
|
sk->sk_write_space(sk);
|
|
sock_put(sk);
|
|
}
|
|
|
|
/*
|
|
* Read buffer destructor automatically called from kfree_skb.
|
|
*/
|
|
void sock_rfree(struct sk_buff *skb)
|
|
{
|
|
struct sock *sk = skb->sk;
|
|
|
|
skb_truesize_check(skb);
|
|
atomic_sub(skb->truesize, &sk->sk_rmem_alloc);
|
|
sk_mem_uncharge(skb->sk, skb->truesize);
|
|
}
|
|
|
|
|
|
int sock_i_uid(struct sock *sk)
|
|
{
|
|
int uid;
|
|
|
|
read_lock(&sk->sk_callback_lock);
|
|
uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0;
|
|
read_unlock(&sk->sk_callback_lock);
|
|
return uid;
|
|
}
|
|
|
|
unsigned long sock_i_ino(struct sock *sk)
|
|
{
|
|
unsigned long ino;
|
|
|
|
read_lock(&sk->sk_callback_lock);
|
|
ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
|
|
read_unlock(&sk->sk_callback_lock);
|
|
return ino;
|
|
}
|
|
|
|
/*
|
|
* Allocate a skb from the socket's send buffer.
|
|
*/
|
|
struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
|
|
gfp_t priority)
|
|
{
|
|
if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
|
|
struct sk_buff * skb = alloc_skb(size, priority);
|
|
if (skb) {
|
|
skb_set_owner_w(skb, sk);
|
|
return skb;
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Allocate a skb from the socket's receive buffer.
|
|
*/
|
|
struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force,
|
|
gfp_t priority)
|
|
{
|
|
if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
|
|
struct sk_buff *skb = alloc_skb(size, priority);
|
|
if (skb) {
|
|
skb_set_owner_r(skb, sk);
|
|
return skb;
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Allocate a memory block from the socket's option memory buffer.
|
|
*/
|
|
void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
|
|
{
|
|
if ((unsigned)size <= sysctl_optmem_max &&
|
|
atomic_read(&sk->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->sk_omem_alloc);
|
|
mem = kmalloc(size, priority);
|
|
if (mem)
|
|
return mem;
|
|
atomic_sub(size, &sk->sk_omem_alloc);
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Free an option memory block.
|
|
*/
|
|
void sock_kfree_s(struct sock *sk, void *mem, int size)
|
|
{
|
|
kfree(mem);
|
|
atomic_sub(size, &sk->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.
|
|
*/
|
|
static long sock_wait_for_wmem(struct sock * sk, long timeo)
|
|
{
|
|
DEFINE_WAIT(wait);
|
|
|
|
clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
|
|
for (;;) {
|
|
if (!timeo)
|
|
break;
|
|
if (signal_pending(current))
|
|
break;
|
|
set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
|
|
prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
|
|
if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
|
|
break;
|
|
if (sk->sk_shutdown & SEND_SHUTDOWN)
|
|
break;
|
|
if (sk->sk_err)
|
|
break;
|
|
timeo = schedule_timeout(timeo);
|
|
}
|
|
finish_wait(sk->sk_sleep, &wait);
|
|
return timeo;
|
|
}
|
|
|
|
|
|
/*
|
|
* Generic send/receive buffer handlers
|
|
*/
|
|
|
|
static struct sk_buff *sock_alloc_send_pskb(struct sock *sk,
|
|
unsigned long header_len,
|
|
unsigned long data_len,
|
|
int noblock, int *errcode)
|
|
{
|
|
struct sk_buff *skb;
|
|
gfp_t gfp_mask;
|
|
long timeo;
|
|
int err;
|
|
|
|
gfp_mask = sk->sk_allocation;
|
|
if (gfp_mask & __GFP_WAIT)
|
|
gfp_mask |= __GFP_REPEAT;
|
|
|
|
timeo = sock_sndtimeo(sk, noblock);
|
|
while (1) {
|
|
err = sock_error(sk);
|
|
if (err != 0)
|
|
goto failure;
|
|
|
|
err = -EPIPE;
|
|
if (sk->sk_shutdown & SEND_SHUTDOWN)
|
|
goto failure;
|
|
|
|
if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
|
|
skb = alloc_skb(header_len, gfp_mask);
|
|
if (skb) {
|
|
int npages;
|
|
int i;
|
|
|
|
/* No pages, we're done... */
|
|
if (!data_len)
|
|
break;
|
|
|
|
npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
|
|
skb->truesize += data_len;
|
|
skb_shinfo(skb)->nr_frags = npages;
|
|
for (i = 0; i < npages; i++) {
|
|
struct page *page;
|
|
skb_frag_t *frag;
|
|
|
|
page = alloc_pages(sk->sk_allocation, 0);
|
|
if (!page) {
|
|
err = -ENOBUFS;
|
|
skb_shinfo(skb)->nr_frags = i;
|
|
kfree_skb(skb);
|
|
goto failure;
|
|
}
|
|
|
|
frag = &skb_shinfo(skb)->frags[i];
|
|
frag->page = page;
|
|
frag->page_offset = 0;
|
|
frag->size = (data_len >= PAGE_SIZE ?
|
|
PAGE_SIZE :
|
|
data_len);
|
|
data_len -= PAGE_SIZE;
|
|
}
|
|
|
|
/* Full success... */
|
|
break;
|
|
}
|
|
err = -ENOBUFS;
|
|
goto failure;
|
|
}
|
|
set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
|
|
set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
|
|
err = -EAGAIN;
|
|
if (!timeo)
|
|
goto failure;
|
|
if (signal_pending(current))
|
|
goto interrupted;
|
|
timeo = sock_wait_for_wmem(sk, timeo);
|
|
}
|
|
|
|
skb_set_owner_w(skb, sk);
|
|
return skb;
|
|
|
|
interrupted:
|
|
err = sock_intr_errno(timeo);
|
|
failure:
|
|
*errcode = err;
|
|
return NULL;
|
|
}
|
|
|
|
struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
|
|
int noblock, int *errcode)
|
|
{
|
|
return sock_alloc_send_pskb(sk, size, 0, noblock, errcode);
|
|
}
|
|
|
|
static void __lock_sock(struct sock *sk)
|
|
{
|
|
DEFINE_WAIT(wait);
|
|
|
|
for (;;) {
|
|
prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
|
|
TASK_UNINTERRUPTIBLE);
|
|
spin_unlock_bh(&sk->sk_lock.slock);
|
|
schedule();
|
|
spin_lock_bh(&sk->sk_lock.slock);
|
|
if (!sock_owned_by_user(sk))
|
|
break;
|
|
}
|
|
finish_wait(&sk->sk_lock.wq, &wait);
|
|
}
|
|
|
|
static void __release_sock(struct sock *sk)
|
|
{
|
|
struct sk_buff *skb = sk->sk_backlog.head;
|
|
|
|
do {
|
|
sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
|
|
bh_unlock_sock(sk);
|
|
|
|
do {
|
|
struct sk_buff *next = skb->next;
|
|
|
|
skb->next = NULL;
|
|
sk->sk_backlog_rcv(sk, skb);
|
|
|
|
/*
|
|
* We are in process context here with softirqs
|
|
* disabled, use cond_resched_softirq() to preempt.
|
|
* This is safe to do because we've taken the backlog
|
|
* queue private:
|
|
*/
|
|
cond_resched_softirq();
|
|
|
|
skb = next;
|
|
} while (skb != NULL);
|
|
|
|
bh_lock_sock(sk);
|
|
} while ((skb = sk->sk_backlog.head) != NULL);
|
|
}
|
|
|
|
/**
|
|
* sk_wait_data - wait for data to arrive at sk_receive_queue
|
|
* @sk: sock to wait on
|
|
* @timeo: for how long
|
|
*
|
|
* Now socket state including sk->sk_err is changed only under lock,
|
|
* hence we may omit checks after joining wait queue.
|
|
* We check receive queue before schedule() only as optimization;
|
|
* it is very likely that release_sock() added new data.
|
|
*/
|
|
int sk_wait_data(struct sock *sk, long *timeo)
|
|
{
|
|
int rc;
|
|
DEFINE_WAIT(wait);
|
|
|
|
prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
|
|
set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
|
|
rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
|
|
clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
|
|
finish_wait(sk->sk_sleep, &wait);
|
|
return rc;
|
|
}
|
|
|
|
EXPORT_SYMBOL(sk_wait_data);
|
|
|
|
/**
|
|
* __sk_mem_schedule - increase sk_forward_alloc and memory_allocated
|
|
* @sk: socket
|
|
* @size: memory size to allocate
|
|
* @kind: allocation type
|
|
*
|
|
* If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
|
|
* rmem allocation. This function assumes that protocols which have
|
|
* memory_pressure use sk_wmem_queued as write buffer accounting.
|
|
*/
|
|
int __sk_mem_schedule(struct sock *sk, int size, int kind)
|
|
{
|
|
struct proto *prot = sk->sk_prot;
|
|
int amt = sk_mem_pages(size);
|
|
int allocated;
|
|
|
|
sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
|
|
allocated = atomic_add_return(amt, prot->memory_allocated);
|
|
|
|
/* Under limit. */
|
|
if (allocated <= prot->sysctl_mem[0]) {
|
|
if (prot->memory_pressure && *prot->memory_pressure)
|
|
*prot->memory_pressure = 0;
|
|
return 1;
|
|
}
|
|
|
|
/* Under pressure. */
|
|
if (allocated > prot->sysctl_mem[1])
|
|
if (prot->enter_memory_pressure)
|
|
prot->enter_memory_pressure();
|
|
|
|
/* Over hard limit. */
|
|
if (allocated > prot->sysctl_mem[2])
|
|
goto suppress_allocation;
|
|
|
|
/* guarantee minimum buffer size under pressure */
|
|
if (kind == SK_MEM_RECV) {
|
|
if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
|
|
return 1;
|
|
} else { /* SK_MEM_SEND */
|
|
if (sk->sk_type == SOCK_STREAM) {
|
|
if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
|
|
return 1;
|
|
} else if (atomic_read(&sk->sk_wmem_alloc) <
|
|
prot->sysctl_wmem[0])
|
|
return 1;
|
|
}
|
|
|
|
if (prot->memory_pressure) {
|
|
if (!*prot->memory_pressure ||
|
|
prot->sysctl_mem[2] > atomic_read(prot->sockets_allocated) *
|
|
sk_mem_pages(sk->sk_wmem_queued +
|
|
atomic_read(&sk->sk_rmem_alloc) +
|
|
sk->sk_forward_alloc))
|
|
return 1;
|
|
}
|
|
|
|
suppress_allocation:
|
|
|
|
if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
|
|
sk_stream_moderate_sndbuf(sk);
|
|
|
|
/* Fail only if socket is _under_ its sndbuf.
|
|
* In this case we cannot block, so that we have to fail.
|
|
*/
|
|
if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
|
|
return 1;
|
|
}
|
|
|
|
/* Alas. Undo changes. */
|
|
sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
|
|
atomic_sub(amt, prot->memory_allocated);
|
|
return 0;
|
|
}
|
|
|
|
EXPORT_SYMBOL(__sk_mem_schedule);
|
|
|
|
/**
|
|
* __sk_reclaim - reclaim memory_allocated
|
|
* @sk: socket
|
|
*/
|
|
void __sk_mem_reclaim(struct sock *sk)
|
|
{
|
|
struct proto *prot = sk->sk_prot;
|
|
|
|
atomic_sub(sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT,
|
|
prot->memory_allocated);
|
|
sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1;
|
|
|
|
if (prot->memory_pressure && *prot->memory_pressure &&
|
|
(atomic_read(prot->memory_allocated) < prot->sysctl_mem[0]))
|
|
*prot->memory_pressure = 0;
|
|
}
|
|
|
|
EXPORT_SYMBOL(__sk_mem_reclaim);
|
|
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
|
|
int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
|
|
{
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
|
|
int len, int flags)
|
|
{
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
|
|
{
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
|
|
{
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
|
|
int *len, int peer)
|
|
{
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
unsigned int sock_no_poll(struct file * file, struct socket *sock, poll_table *pt)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
|
|
{
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
int sock_no_listen(struct socket *sock, int backlog)
|
|
{
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
int sock_no_shutdown(struct socket *sock, int how)
|
|
{
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
int sock_no_setsockopt(struct socket *sock, int level, int optname,
|
|
char __user *optval, int optlen)
|
|
{
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
int sock_no_getsockopt(struct socket *sock, int level, int optname,
|
|
char __user *optval, int __user *optlen)
|
|
{
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
|
|
size_t len)
|
|
{
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
|
|
size_t len, int flags)
|
|
{
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
|
|
{
|
|
/* Mirror missing mmap method error code */
|
|
return -ENODEV;
|
|
}
|
|
|
|
ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
|
|
{
|
|
ssize_t res;
|
|
struct msghdr msg = {.msg_flags = flags};
|
|
struct kvec iov;
|
|
char *kaddr = kmap(page);
|
|
iov.iov_base = kaddr + offset;
|
|
iov.iov_len = size;
|
|
res = kernel_sendmsg(sock, &msg, &iov, 1, size);
|
|
kunmap(page);
|
|
return res;
|
|
}
|
|
|
|
/*
|
|
* Default Socket Callbacks
|
|
*/
|
|
|
|
static void sock_def_wakeup(struct sock *sk)
|
|
{
|
|
read_lock(&sk->sk_callback_lock);
|
|
if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
|
|
wake_up_interruptible_all(sk->sk_sleep);
|
|
read_unlock(&sk->sk_callback_lock);
|
|
}
|
|
|
|
static void sock_def_error_report(struct sock *sk)
|
|
{
|
|
read_lock(&sk->sk_callback_lock);
|
|
if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
|
|
wake_up_interruptible(sk->sk_sleep);
|
|
sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
|
|
read_unlock(&sk->sk_callback_lock);
|
|
}
|
|
|
|
static void sock_def_readable(struct sock *sk, int len)
|
|
{
|
|
read_lock(&sk->sk_callback_lock);
|
|
if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
|
|
wake_up_interruptible_sync(sk->sk_sleep);
|
|
sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
|
|
read_unlock(&sk->sk_callback_lock);
|
|
}
|
|
|
|
static void sock_def_write_space(struct sock *sk)
|
|
{
|
|
read_lock(&sk->sk_callback_lock);
|
|
|
|
/* Do not wake up a writer until he can make "significant"
|
|
* progress. --DaveM
|
|
*/
|
|
if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
|
|
if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
|
|
wake_up_interruptible_sync(sk->sk_sleep);
|
|
|
|
/* Should agree with poll, otherwise some programs break */
|
|
if (sock_writeable(sk))
|
|
sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
|
|
}
|
|
|
|
read_unlock(&sk->sk_callback_lock);
|
|
}
|
|
|
|
static void sock_def_destruct(struct sock *sk)
|
|
{
|
|
kfree(sk->sk_protinfo);
|
|
}
|
|
|
|
void sk_send_sigurg(struct sock *sk)
|
|
{
|
|
if (sk->sk_socket && sk->sk_socket->file)
|
|
if (send_sigurg(&sk->sk_socket->file->f_owner))
|
|
sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
|
|
}
|
|
|
|
void sk_reset_timer(struct sock *sk, struct timer_list* timer,
|
|
unsigned long expires)
|
|
{
|
|
if (!mod_timer(timer, expires))
|
|
sock_hold(sk);
|
|
}
|
|
|
|
EXPORT_SYMBOL(sk_reset_timer);
|
|
|
|
void sk_stop_timer(struct sock *sk, struct timer_list* timer)
|
|
{
|
|
if (timer_pending(timer) && del_timer(timer))
|
|
__sock_put(sk);
|
|
}
|
|
|
|
EXPORT_SYMBOL(sk_stop_timer);
|
|
|
|
void sock_init_data(struct socket *sock, struct sock *sk)
|
|
{
|
|
skb_queue_head_init(&sk->sk_receive_queue);
|
|
skb_queue_head_init(&sk->sk_write_queue);
|
|
skb_queue_head_init(&sk->sk_error_queue);
|
|
#ifdef CONFIG_NET_DMA
|
|
skb_queue_head_init(&sk->sk_async_wait_queue);
|
|
#endif
|
|
|
|
sk->sk_send_head = NULL;
|
|
|
|
init_timer(&sk->sk_timer);
|
|
|
|
sk->sk_allocation = GFP_KERNEL;
|
|
sk->sk_rcvbuf = sysctl_rmem_default;
|
|
sk->sk_sndbuf = sysctl_wmem_default;
|
|
sk->sk_state = TCP_CLOSE;
|
|
sk->sk_socket = sock;
|
|
|
|
sock_set_flag(sk, SOCK_ZAPPED);
|
|
|
|
if (sock) {
|
|
sk->sk_type = sock->type;
|
|
sk->sk_sleep = &sock->wait;
|
|
sock->sk = sk;
|
|
} else
|
|
sk->sk_sleep = NULL;
|
|
|
|
rwlock_init(&sk->sk_dst_lock);
|
|
rwlock_init(&sk->sk_callback_lock);
|
|
lockdep_set_class_and_name(&sk->sk_callback_lock,
|
|
af_callback_keys + sk->sk_family,
|
|
af_family_clock_key_strings[sk->sk_family]);
|
|
|
|
sk->sk_state_change = sock_def_wakeup;
|
|
sk->sk_data_ready = sock_def_readable;
|
|
sk->sk_write_space = sock_def_write_space;
|
|
sk->sk_error_report = sock_def_error_report;
|
|
sk->sk_destruct = sock_def_destruct;
|
|
|
|
sk->sk_sndmsg_page = NULL;
|
|
sk->sk_sndmsg_off = 0;
|
|
|
|
sk->sk_peercred.pid = 0;
|
|
sk->sk_peercred.uid = -1;
|
|
sk->sk_peercred.gid = -1;
|
|
sk->sk_write_pending = 0;
|
|
sk->sk_rcvlowat = 1;
|
|
sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
|
|
sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
|
|
|
|
sk->sk_stamp = ktime_set(-1L, 0);
|
|
|
|
atomic_set(&sk->sk_refcnt, 1);
|
|
atomic_set(&sk->sk_drops, 0);
|
|
}
|
|
|
|
void lock_sock_nested(struct sock *sk, int subclass)
|
|
{
|
|
might_sleep();
|
|
spin_lock_bh(&sk->sk_lock.slock);
|
|
if (sk->sk_lock.owned)
|
|
__lock_sock(sk);
|
|
sk->sk_lock.owned = 1;
|
|
spin_unlock(&sk->sk_lock.slock);
|
|
/*
|
|
* The sk_lock has mutex_lock() semantics here:
|
|
*/
|
|
mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
|
|
local_bh_enable();
|
|
}
|
|
|
|
EXPORT_SYMBOL(lock_sock_nested);
|
|
|
|
void release_sock(struct sock *sk)
|
|
{
|
|
/*
|
|
* The sk_lock has mutex_unlock() semantics:
|
|
*/
|
|
mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
|
|
|
|
spin_lock_bh(&sk->sk_lock.slock);
|
|
if (sk->sk_backlog.tail)
|
|
__release_sock(sk);
|
|
sk->sk_lock.owned = 0;
|
|
if (waitqueue_active(&sk->sk_lock.wq))
|
|
wake_up(&sk->sk_lock.wq);
|
|
spin_unlock_bh(&sk->sk_lock.slock);
|
|
}
|
|
EXPORT_SYMBOL(release_sock);
|
|
|
|
int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
|
|
{
|
|
struct timeval tv;
|
|
if (!sock_flag(sk, SOCK_TIMESTAMP))
|
|
sock_enable_timestamp(sk);
|
|
tv = ktime_to_timeval(sk->sk_stamp);
|
|
if (tv.tv_sec == -1)
|
|
return -ENOENT;
|
|
if (tv.tv_sec == 0) {
|
|
sk->sk_stamp = ktime_get_real();
|
|
tv = ktime_to_timeval(sk->sk_stamp);
|
|
}
|
|
return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
|
|
}
|
|
EXPORT_SYMBOL(sock_get_timestamp);
|
|
|
|
int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
|
|
{
|
|
struct timespec ts;
|
|
if (!sock_flag(sk, SOCK_TIMESTAMP))
|
|
sock_enable_timestamp(sk);
|
|
ts = ktime_to_timespec(sk->sk_stamp);
|
|
if (ts.tv_sec == -1)
|
|
return -ENOENT;
|
|
if (ts.tv_sec == 0) {
|
|
sk->sk_stamp = ktime_get_real();
|
|
ts = ktime_to_timespec(sk->sk_stamp);
|
|
}
|
|
return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
|
|
}
|
|
EXPORT_SYMBOL(sock_get_timestampns);
|
|
|
|
void sock_enable_timestamp(struct sock *sk)
|
|
{
|
|
if (!sock_flag(sk, SOCK_TIMESTAMP)) {
|
|
sock_set_flag(sk, SOCK_TIMESTAMP);
|
|
net_enable_timestamp();
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Get a socket option on an socket.
|
|
*
|
|
* FIX: POSIX 1003.1g is very ambiguous here. It states that
|
|
* asynchronous errors should be reported by getsockopt. We assume
|
|
* this means if you specify SO_ERROR (otherwise whats the point of it).
|
|
*/
|
|
int sock_common_getsockopt(struct socket *sock, int level, int optname,
|
|
char __user *optval, int __user *optlen)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
|
|
return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
|
|
}
|
|
|
|
EXPORT_SYMBOL(sock_common_getsockopt);
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
|
|
char __user *optval, int __user *optlen)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
|
|
if (sk->sk_prot->compat_getsockopt != NULL)
|
|
return sk->sk_prot->compat_getsockopt(sk, level, optname,
|
|
optval, optlen);
|
|
return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
|
|
}
|
|
EXPORT_SYMBOL(compat_sock_common_getsockopt);
|
|
#endif
|
|
|
|
int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
|
|
struct msghdr *msg, size_t size, int flags)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
int addr_len = 0;
|
|
int err;
|
|
|
|
err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
|
|
flags & ~MSG_DONTWAIT, &addr_len);
|
|
if (err >= 0)
|
|
msg->msg_namelen = addr_len;
|
|
return err;
|
|
}
|
|
|
|
EXPORT_SYMBOL(sock_common_recvmsg);
|
|
|
|
/*
|
|
* Set socket options on an inet socket.
|
|
*/
|
|
int sock_common_setsockopt(struct socket *sock, int level, int optname,
|
|
char __user *optval, int optlen)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
|
|
return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
|
|
}
|
|
|
|
EXPORT_SYMBOL(sock_common_setsockopt);
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
|
|
char __user *optval, int optlen)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
|
|
if (sk->sk_prot->compat_setsockopt != NULL)
|
|
return sk->sk_prot->compat_setsockopt(sk, level, optname,
|
|
optval, optlen);
|
|
return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
|
|
}
|
|
EXPORT_SYMBOL(compat_sock_common_setsockopt);
|
|
#endif
|
|
|
|
void sk_common_release(struct sock *sk)
|
|
{
|
|
if (sk->sk_prot->destroy)
|
|
sk->sk_prot->destroy(sk);
|
|
|
|
/*
|
|
* Observation: when sock_common_release is called, processes have
|
|
* no access to socket. But net still has.
|
|
* Step one, detach it from networking:
|
|
*
|
|
* A. Remove from hash tables.
|
|
*/
|
|
|
|
sk->sk_prot->unhash(sk);
|
|
|
|
/*
|
|
* In this point socket cannot receive new packets, but it is possible
|
|
* that some packets are in flight because some CPU runs receiver and
|
|
* did hash table lookup before we unhashed socket. They will achieve
|
|
* receive queue and will be purged by socket destructor.
|
|
*
|
|
* Also we still have packets pending on receive queue and probably,
|
|
* our own packets waiting in device queues. sock_destroy will drain
|
|
* receive queue, but transmitted packets will delay socket destruction
|
|
* until the last reference will be released.
|
|
*/
|
|
|
|
sock_orphan(sk);
|
|
|
|
xfrm_sk_free_policy(sk);
|
|
|
|
sk_refcnt_debug_release(sk);
|
|
sock_put(sk);
|
|
}
|
|
|
|
EXPORT_SYMBOL(sk_common_release);
|
|
|
|
static DEFINE_RWLOCK(proto_list_lock);
|
|
static LIST_HEAD(proto_list);
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
#define PROTO_INUSE_NR 64 /* should be enough for the first time */
|
|
struct prot_inuse {
|
|
int val[PROTO_INUSE_NR];
|
|
};
|
|
|
|
static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
|
|
|
|
#ifdef CONFIG_NET_NS
|
|
void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
|
|
{
|
|
int cpu = smp_processor_id();
|
|
per_cpu_ptr(net->core.inuse, cpu)->val[prot->inuse_idx] += val;
|
|
}
|
|
EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
|
|
|
|
int sock_prot_inuse_get(struct net *net, struct proto *prot)
|
|
{
|
|
int cpu, idx = prot->inuse_idx;
|
|
int res = 0;
|
|
|
|
for_each_possible_cpu(cpu)
|
|
res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];
|
|
|
|
return res >= 0 ? res : 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
|
|
|
|
static int sock_inuse_init_net(struct net *net)
|
|
{
|
|
net->core.inuse = alloc_percpu(struct prot_inuse);
|
|
return net->core.inuse ? 0 : -ENOMEM;
|
|
}
|
|
|
|
static void sock_inuse_exit_net(struct net *net)
|
|
{
|
|
free_percpu(net->core.inuse);
|
|
}
|
|
|
|
static struct pernet_operations net_inuse_ops = {
|
|
.init = sock_inuse_init_net,
|
|
.exit = sock_inuse_exit_net,
|
|
};
|
|
|
|
static __init int net_inuse_init(void)
|
|
{
|
|
if (register_pernet_subsys(&net_inuse_ops))
|
|
panic("Cannot initialize net inuse counters");
|
|
|
|
return 0;
|
|
}
|
|
|
|
core_initcall(net_inuse_init);
|
|
#else
|
|
static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);
|
|
|
|
void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
|
|
{
|
|
__get_cpu_var(prot_inuse).val[prot->inuse_idx] += val;
|
|
}
|
|
EXPORT_SYMBOL_GPL(sock_prot_inuse_add);
|
|
|
|
int sock_prot_inuse_get(struct net *net, struct proto *prot)
|
|
{
|
|
int cpu, idx = prot->inuse_idx;
|
|
int res = 0;
|
|
|
|
for_each_possible_cpu(cpu)
|
|
res += per_cpu(prot_inuse, cpu).val[idx];
|
|
|
|
return res >= 0 ? res : 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
|
|
#endif
|
|
|
|
static void assign_proto_idx(struct proto *prot)
|
|
{
|
|
prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
|
|
|
|
if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
|
|
printk(KERN_ERR "PROTO_INUSE_NR exhausted\n");
|
|
return;
|
|
}
|
|
|
|
set_bit(prot->inuse_idx, proto_inuse_idx);
|
|
}
|
|
|
|
static void release_proto_idx(struct proto *prot)
|
|
{
|
|
if (prot->inuse_idx != PROTO_INUSE_NR - 1)
|
|
clear_bit(prot->inuse_idx, proto_inuse_idx);
|
|
}
|
|
#else
|
|
static inline void assign_proto_idx(struct proto *prot)
|
|
{
|
|
}
|
|
|
|
static inline void release_proto_idx(struct proto *prot)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
int proto_register(struct proto *prot, int alloc_slab)
|
|
{
|
|
char *request_sock_slab_name = NULL;
|
|
char *timewait_sock_slab_name;
|
|
|
|
if (alloc_slab) {
|
|
prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
|
|
SLAB_HWCACHE_ALIGN, NULL);
|
|
|
|
if (prot->slab == NULL) {
|
|
printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n",
|
|
prot->name);
|
|
goto out;
|
|
}
|
|
|
|
if (prot->rsk_prot != NULL) {
|
|
static const char mask[] = "request_sock_%s";
|
|
|
|
request_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL);
|
|
if (request_sock_slab_name == NULL)
|
|
goto out_free_sock_slab;
|
|
|
|
sprintf(request_sock_slab_name, mask, prot->name);
|
|
prot->rsk_prot->slab = kmem_cache_create(request_sock_slab_name,
|
|
prot->rsk_prot->obj_size, 0,
|
|
SLAB_HWCACHE_ALIGN, NULL);
|
|
|
|
if (prot->rsk_prot->slab == NULL) {
|
|
printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n",
|
|
prot->name);
|
|
goto out_free_request_sock_slab_name;
|
|
}
|
|
}
|
|
|
|
if (prot->twsk_prot != NULL) {
|
|
static const char mask[] = "tw_sock_%s";
|
|
|
|
timewait_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL);
|
|
|
|
if (timewait_sock_slab_name == NULL)
|
|
goto out_free_request_sock_slab;
|
|
|
|
sprintf(timewait_sock_slab_name, mask, prot->name);
|
|
prot->twsk_prot->twsk_slab =
|
|
kmem_cache_create(timewait_sock_slab_name,
|
|
prot->twsk_prot->twsk_obj_size,
|
|
0, SLAB_HWCACHE_ALIGN,
|
|
NULL);
|
|
if (prot->twsk_prot->twsk_slab == NULL)
|
|
goto out_free_timewait_sock_slab_name;
|
|
}
|
|
}
|
|
|
|
write_lock(&proto_list_lock);
|
|
list_add(&prot->node, &proto_list);
|
|
assign_proto_idx(prot);
|
|
write_unlock(&proto_list_lock);
|
|
return 0;
|
|
|
|
out_free_timewait_sock_slab_name:
|
|
kfree(timewait_sock_slab_name);
|
|
out_free_request_sock_slab:
|
|
if (prot->rsk_prot && prot->rsk_prot->slab) {
|
|
kmem_cache_destroy(prot->rsk_prot->slab);
|
|
prot->rsk_prot->slab = NULL;
|
|
}
|
|
out_free_request_sock_slab_name:
|
|
kfree(request_sock_slab_name);
|
|
out_free_sock_slab:
|
|
kmem_cache_destroy(prot->slab);
|
|
prot->slab = NULL;
|
|
out:
|
|
return -ENOBUFS;
|
|
}
|
|
|
|
EXPORT_SYMBOL(proto_register);
|
|
|
|
void proto_unregister(struct proto *prot)
|
|
{
|
|
write_lock(&proto_list_lock);
|
|
release_proto_idx(prot);
|
|
list_del(&prot->node);
|
|
write_unlock(&proto_list_lock);
|
|
|
|
if (prot->slab != NULL) {
|
|
kmem_cache_destroy(prot->slab);
|
|
prot->slab = NULL;
|
|
}
|
|
|
|
if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
|
|
const char *name = kmem_cache_name(prot->rsk_prot->slab);
|
|
|
|
kmem_cache_destroy(prot->rsk_prot->slab);
|
|
kfree(name);
|
|
prot->rsk_prot->slab = NULL;
|
|
}
|
|
|
|
if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
|
|
const char *name = kmem_cache_name(prot->twsk_prot->twsk_slab);
|
|
|
|
kmem_cache_destroy(prot->twsk_prot->twsk_slab);
|
|
kfree(name);
|
|
prot->twsk_prot->twsk_slab = NULL;
|
|
}
|
|
}
|
|
|
|
EXPORT_SYMBOL(proto_unregister);
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
|
|
__acquires(proto_list_lock)
|
|
{
|
|
read_lock(&proto_list_lock);
|
|
return seq_list_start_head(&proto_list, *pos);
|
|
}
|
|
|
|
static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
|
|
{
|
|
return seq_list_next(v, &proto_list, pos);
|
|
}
|
|
|
|
static void proto_seq_stop(struct seq_file *seq, void *v)
|
|
__releases(proto_list_lock)
|
|
{
|
|
read_unlock(&proto_list_lock);
|
|
}
|
|
|
|
static char proto_method_implemented(const void *method)
|
|
{
|
|
return method == NULL ? 'n' : 'y';
|
|
}
|
|
|
|
static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
|
|
{
|
|
seq_printf(seq, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s "
|
|
"%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
|
|
proto->name,
|
|
proto->obj_size,
|
|
proto->sockets_allocated != NULL ? atomic_read(proto->sockets_allocated) : -1,
|
|
proto->memory_allocated != NULL ? atomic_read(proto->memory_allocated) : -1,
|
|
proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI",
|
|
proto->max_header,
|
|
proto->slab == NULL ? "no" : "yes",
|
|
module_name(proto->owner),
|
|
proto_method_implemented(proto->close),
|
|
proto_method_implemented(proto->connect),
|
|
proto_method_implemented(proto->disconnect),
|
|
proto_method_implemented(proto->accept),
|
|
proto_method_implemented(proto->ioctl),
|
|
proto_method_implemented(proto->init),
|
|
proto_method_implemented(proto->destroy),
|
|
proto_method_implemented(proto->shutdown),
|
|
proto_method_implemented(proto->setsockopt),
|
|
proto_method_implemented(proto->getsockopt),
|
|
proto_method_implemented(proto->sendmsg),
|
|
proto_method_implemented(proto->recvmsg),
|
|
proto_method_implemented(proto->sendpage),
|
|
proto_method_implemented(proto->bind),
|
|
proto_method_implemented(proto->backlog_rcv),
|
|
proto_method_implemented(proto->hash),
|
|
proto_method_implemented(proto->unhash),
|
|
proto_method_implemented(proto->get_port),
|
|
proto_method_implemented(proto->enter_memory_pressure));
|
|
}
|
|
|
|
static int proto_seq_show(struct seq_file *seq, void *v)
|
|
{
|
|
if (v == &proto_list)
|
|
seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
|
|
"protocol",
|
|
"size",
|
|
"sockets",
|
|
"memory",
|
|
"press",
|
|
"maxhdr",
|
|
"slab",
|
|
"module",
|
|
"cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
|
|
else
|
|
proto_seq_printf(seq, list_entry(v, struct proto, node));
|
|
return 0;
|
|
}
|
|
|
|
static const struct seq_operations proto_seq_ops = {
|
|
.start = proto_seq_start,
|
|
.next = proto_seq_next,
|
|
.stop = proto_seq_stop,
|
|
.show = proto_seq_show,
|
|
};
|
|
|
|
static int proto_seq_open(struct inode *inode, struct file *file)
|
|
{
|
|
return seq_open(file, &proto_seq_ops);
|
|
}
|
|
|
|
static const struct file_operations proto_seq_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = proto_seq_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = seq_release,
|
|
};
|
|
|
|
static int __init proto_init(void)
|
|
{
|
|
/* register /proc/net/protocols */
|
|
return proc_net_fops_create(&init_net, "protocols", S_IRUGO, &proto_seq_fops) == NULL ? -ENOBUFS : 0;
|
|
}
|
|
|
|
subsys_initcall(proto_init);
|
|
|
|
#endif /* PROC_FS */
|
|
|
|
EXPORT_SYMBOL(sk_alloc);
|
|
EXPORT_SYMBOL(sk_free);
|
|
EXPORT_SYMBOL(sk_send_sigurg);
|
|
EXPORT_SYMBOL(sock_alloc_send_skb);
|
|
EXPORT_SYMBOL(sock_init_data);
|
|
EXPORT_SYMBOL(sock_kfree_s);
|
|
EXPORT_SYMBOL(sock_kmalloc);
|
|
EXPORT_SYMBOL(sock_no_accept);
|
|
EXPORT_SYMBOL(sock_no_bind);
|
|
EXPORT_SYMBOL(sock_no_connect);
|
|
EXPORT_SYMBOL(sock_no_getname);
|
|
EXPORT_SYMBOL(sock_no_getsockopt);
|
|
EXPORT_SYMBOL(sock_no_ioctl);
|
|
EXPORT_SYMBOL(sock_no_listen);
|
|
EXPORT_SYMBOL(sock_no_mmap);
|
|
EXPORT_SYMBOL(sock_no_poll);
|
|
EXPORT_SYMBOL(sock_no_recvmsg);
|
|
EXPORT_SYMBOL(sock_no_sendmsg);
|
|
EXPORT_SYMBOL(sock_no_sendpage);
|
|
EXPORT_SYMBOL(sock_no_setsockopt);
|
|
EXPORT_SYMBOL(sock_no_shutdown);
|
|
EXPORT_SYMBOL(sock_no_socketpair);
|
|
EXPORT_SYMBOL(sock_rfree);
|
|
EXPORT_SYMBOL(sock_setsockopt);
|
|
EXPORT_SYMBOL(sock_wfree);
|
|
EXPORT_SYMBOL(sock_wmalloc);
|
|
EXPORT_SYMBOL(sock_i_uid);
|
|
EXPORT_SYMBOL(sock_i_ino);
|
|
EXPORT_SYMBOL(sysctl_optmem_max);
|