![Eric Dumazet](/assets/img/avatar_default.png)
"struct proto" currently uses an array stats[NR_CPUS] to track change on 'inuse' sockets per protocol. If NR_CPUS is big, this means we use a big memory area for this. Moreover, all this memory area is located on a single node on NUMA machines, increasing memory pressure on the boot node. In this patch, I tried to : - Keep a fast !CONFIG_SMP implementation - Keep a fast CONFIG_SMP implementation for often used protocols (tcp,udp,raw,...) - Introduce a NUMA efficient implementation Some helper macros are defined in include/net/sock.h These macros take into account CONFIG_SMP If a "struct proto" is declared without using DEFINE_PROTO_INUSE / REF_PROTO_INUSE macros, it will automatically use a default implementation, using a dynamically allocated percpu zone. This default implementation will be NUMA efficient, but might use 32/64 bytes per possible cpu because of current alloc_percpu() implementation. However it still should be better than previous implementation based on stats[NR_CPUS] field. When a "struct proto" is changed to use the new macros, we use a single static "int" percpu variable, lowering the memory and cpu costs, still preserving NUMA efficiency. Signed-off-by: Eric Dumazet <dada1@cosmosbay.com> Signed-off-by: David S. Miller <davem@davemloft.net>
1412 lines
40 KiB
C
1412 lines
40 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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* Definitions for the AF_INET socket handler.
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*
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* Version: @(#)sock.h 1.0.4 05/13/93
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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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* Corey Minyard <wf-rch!minyard@relay.EU.net>
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* Florian La Roche <flla@stud.uni-sb.de>
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*
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* Fixes:
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* Alan Cox : Volatiles in skbuff pointers. See
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* skbuff comments. May be overdone,
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* better to prove they can be removed
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* than the reverse.
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* Alan Cox : Added a zapped field for tcp to note
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* a socket is reset and must stay shut up
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* Alan Cox : New fields for options
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* Pauline Middelink : identd support
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* Alan Cox : Eliminate low level recv/recvfrom
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* David S. Miller : New socket lookup architecture.
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* Steve Whitehouse: Default routines for sock_ops
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* Arnaldo C. Melo : removed net_pinfo, tp_pinfo and made
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* protinfo be just a void pointer, as the
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* protocol specific parts were moved to
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* respective headers and ipv4/v6, etc now
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* use private slabcaches for its socks
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* Pedro Hortas : New flags field for socket options
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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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#ifndef _SOCK_H
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#define _SOCK_H
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#include <linux/kernel.h>
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#include <linux/list.h>
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#include <linux/timer.h>
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#include <linux/cache.h>
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#include <linux/module.h>
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#include <linux/lockdep.h>
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#include <linux/netdevice.h>
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#include <linux/skbuff.h> /* struct sk_buff */
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#include <linux/mm.h>
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#include <linux/security.h>
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#include <linux/filter.h>
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#include <asm/atomic.h>
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#include <net/dst.h>
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#include <net/checksum.h>
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#include <net/net_namespace.h>
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/*
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* This structure really needs to be cleaned up.
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* Most of it is for TCP, and not used by any of
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* the other protocols.
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*/
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/* Define this to get the SOCK_DBG debugging facility. */
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#define SOCK_DEBUGGING
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#ifdef SOCK_DEBUGGING
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#define SOCK_DEBUG(sk, msg...) do { if ((sk) && sock_flag((sk), SOCK_DBG)) \
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printk(KERN_DEBUG msg); } while (0)
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#else
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#define SOCK_DEBUG(sk, msg...) do { } while (0)
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#endif
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/* This is the per-socket lock. The spinlock provides a synchronization
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* between user contexts and software interrupt processing, whereas the
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* mini-semaphore synchronizes multiple users amongst themselves.
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*/
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typedef struct {
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spinlock_t slock;
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int owned;
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wait_queue_head_t wq;
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/*
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* We express the mutex-alike socket_lock semantics
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* to the lock validator by explicitly managing
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* the slock as a lock variant (in addition to
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* the slock itself):
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*/
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#ifdef CONFIG_DEBUG_LOCK_ALLOC
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struct lockdep_map dep_map;
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#endif
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} socket_lock_t;
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struct sock;
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struct proto;
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/**
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* struct sock_common - minimal network layer representation of sockets
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* @skc_family: network address family
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* @skc_state: Connection state
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* @skc_reuse: %SO_REUSEADDR setting
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* @skc_bound_dev_if: bound device index if != 0
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* @skc_node: main hash linkage for various protocol lookup tables
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* @skc_bind_node: bind hash linkage for various protocol lookup tables
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* @skc_refcnt: reference count
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* @skc_hash: hash value used with various protocol lookup tables
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* @skc_prot: protocol handlers inside a network family
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* @skc_net: reference to the network namespace of this socket
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*
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* This is the minimal network layer representation of sockets, the header
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* for struct sock and struct inet_timewait_sock.
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*/
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struct sock_common {
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unsigned short skc_family;
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volatile unsigned char skc_state;
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unsigned char skc_reuse;
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int skc_bound_dev_if;
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struct hlist_node skc_node;
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struct hlist_node skc_bind_node;
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atomic_t skc_refcnt;
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unsigned int skc_hash;
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struct proto *skc_prot;
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struct net *skc_net;
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};
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/**
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* struct sock - network layer representation of sockets
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* @__sk_common: shared layout with inet_timewait_sock
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* @sk_shutdown: mask of %SEND_SHUTDOWN and/or %RCV_SHUTDOWN
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* @sk_userlocks: %SO_SNDBUF and %SO_RCVBUF settings
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* @sk_lock: synchronizer
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* @sk_rcvbuf: size of receive buffer in bytes
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* @sk_sleep: sock wait queue
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* @sk_dst_cache: destination cache
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* @sk_dst_lock: destination cache lock
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* @sk_policy: flow policy
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* @sk_rmem_alloc: receive queue bytes committed
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* @sk_receive_queue: incoming packets
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* @sk_wmem_alloc: transmit queue bytes committed
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* @sk_write_queue: Packet sending queue
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* @sk_async_wait_queue: DMA copied packets
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* @sk_omem_alloc: "o" is "option" or "other"
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* @sk_wmem_queued: persistent queue size
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* @sk_forward_alloc: space allocated forward
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* @sk_allocation: allocation mode
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* @sk_sndbuf: size of send buffer in bytes
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* @sk_flags: %SO_LINGER (l_onoff), %SO_BROADCAST, %SO_KEEPALIVE, %SO_OOBINLINE settings
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* @sk_no_check: %SO_NO_CHECK setting, wether or not checkup packets
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* @sk_route_caps: route capabilities (e.g. %NETIF_F_TSO)
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* @sk_gso_type: GSO type (e.g. %SKB_GSO_TCPV4)
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* @sk_lingertime: %SO_LINGER l_linger setting
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* @sk_backlog: always used with the per-socket spinlock held
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* @sk_callback_lock: used with the callbacks in the end of this struct
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* @sk_error_queue: rarely used
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* @sk_prot_creator: sk_prot of original sock creator (see ipv6_setsockopt, IPV6_ADDRFORM for instance)
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* @sk_err: last error
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* @sk_err_soft: errors that don't cause failure but are the cause of a persistent failure not just 'timed out'
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* @sk_ack_backlog: current listen backlog
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* @sk_max_ack_backlog: listen backlog set in listen()
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* @sk_priority: %SO_PRIORITY setting
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* @sk_type: socket type (%SOCK_STREAM, etc)
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* @sk_protocol: which protocol this socket belongs in this network family
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* @sk_peercred: %SO_PEERCRED setting
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* @sk_rcvlowat: %SO_RCVLOWAT setting
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* @sk_rcvtimeo: %SO_RCVTIMEO setting
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* @sk_sndtimeo: %SO_SNDTIMEO setting
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* @sk_filter: socket filtering instructions
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* @sk_protinfo: private area, net family specific, when not using slab
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* @sk_timer: sock cleanup timer
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* @sk_stamp: time stamp of last packet received
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* @sk_socket: Identd and reporting IO signals
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* @sk_user_data: RPC layer private data
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* @sk_sndmsg_page: cached page for sendmsg
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* @sk_sndmsg_off: cached offset for sendmsg
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* @sk_send_head: front of stuff to transmit
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* @sk_security: used by security modules
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* @sk_write_pending: a write to stream socket waits to start
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* @sk_state_change: callback to indicate change in the state of the sock
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* @sk_data_ready: callback to indicate there is data to be processed
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* @sk_write_space: callback to indicate there is bf sending space available
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* @sk_error_report: callback to indicate errors (e.g. %MSG_ERRQUEUE)
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* @sk_backlog_rcv: callback to process the backlog
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* @sk_destruct: called at sock freeing time, i.e. when all refcnt == 0
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*/
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struct sock {
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/*
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* Now struct inet_timewait_sock also uses sock_common, so please just
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* don't add nothing before this first member (__sk_common) --acme
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*/
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struct sock_common __sk_common;
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#define sk_family __sk_common.skc_family
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#define sk_state __sk_common.skc_state
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#define sk_reuse __sk_common.skc_reuse
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#define sk_bound_dev_if __sk_common.skc_bound_dev_if
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#define sk_node __sk_common.skc_node
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#define sk_bind_node __sk_common.skc_bind_node
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#define sk_refcnt __sk_common.skc_refcnt
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#define sk_hash __sk_common.skc_hash
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#define sk_prot __sk_common.skc_prot
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#define sk_net __sk_common.skc_net
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unsigned char sk_shutdown : 2,
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sk_no_check : 2,
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sk_userlocks : 4;
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unsigned char sk_protocol;
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unsigned short sk_type;
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int sk_rcvbuf;
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socket_lock_t sk_lock;
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/*
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* The backlog queue is special, it is always used with
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* the per-socket spinlock held and requires low latency
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* access. Therefore we special case it's implementation.
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*/
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struct {
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struct sk_buff *head;
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struct sk_buff *tail;
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} sk_backlog;
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wait_queue_head_t *sk_sleep;
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struct dst_entry *sk_dst_cache;
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struct xfrm_policy *sk_policy[2];
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rwlock_t sk_dst_lock;
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atomic_t sk_rmem_alloc;
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atomic_t sk_wmem_alloc;
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atomic_t sk_omem_alloc;
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int sk_sndbuf;
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struct sk_buff_head sk_receive_queue;
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struct sk_buff_head sk_write_queue;
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struct sk_buff_head sk_async_wait_queue;
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int sk_wmem_queued;
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int sk_forward_alloc;
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gfp_t sk_allocation;
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int sk_route_caps;
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int sk_gso_type;
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int sk_rcvlowat;
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unsigned long sk_flags;
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unsigned long sk_lingertime;
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struct sk_buff_head sk_error_queue;
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struct proto *sk_prot_creator;
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rwlock_t sk_callback_lock;
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int sk_err,
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sk_err_soft;
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unsigned short sk_ack_backlog;
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unsigned short sk_max_ack_backlog;
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__u32 sk_priority;
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struct ucred sk_peercred;
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long sk_rcvtimeo;
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long sk_sndtimeo;
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struct sk_filter *sk_filter;
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void *sk_protinfo;
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struct timer_list sk_timer;
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ktime_t sk_stamp;
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struct socket *sk_socket;
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void *sk_user_data;
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struct page *sk_sndmsg_page;
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struct sk_buff *sk_send_head;
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__u32 sk_sndmsg_off;
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int sk_write_pending;
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void *sk_security;
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void (*sk_state_change)(struct sock *sk);
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void (*sk_data_ready)(struct sock *sk, int bytes);
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void (*sk_write_space)(struct sock *sk);
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void (*sk_error_report)(struct sock *sk);
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int (*sk_backlog_rcv)(struct sock *sk,
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struct sk_buff *skb);
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void (*sk_destruct)(struct sock *sk);
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};
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/*
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* Hashed lists helper routines
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*/
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static inline struct sock *__sk_head(const struct hlist_head *head)
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{
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return hlist_entry(head->first, struct sock, sk_node);
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}
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static inline struct sock *sk_head(const struct hlist_head *head)
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{
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return hlist_empty(head) ? NULL : __sk_head(head);
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}
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static inline struct sock *sk_next(const struct sock *sk)
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{
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return sk->sk_node.next ?
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hlist_entry(sk->sk_node.next, struct sock, sk_node) : NULL;
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}
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static inline int sk_unhashed(const struct sock *sk)
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{
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return hlist_unhashed(&sk->sk_node);
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}
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static inline int sk_hashed(const struct sock *sk)
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{
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return !sk_unhashed(sk);
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}
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static __inline__ void sk_node_init(struct hlist_node *node)
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{
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node->pprev = NULL;
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}
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static __inline__ void __sk_del_node(struct sock *sk)
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{
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__hlist_del(&sk->sk_node);
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}
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static __inline__ int __sk_del_node_init(struct sock *sk)
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{
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if (sk_hashed(sk)) {
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__sk_del_node(sk);
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sk_node_init(&sk->sk_node);
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return 1;
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}
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return 0;
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}
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/* Grab socket reference count. This operation is valid only
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when sk is ALREADY grabbed f.e. it is found in hash table
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or a list and the lookup is made under lock preventing hash table
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modifications.
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*/
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static inline void sock_hold(struct sock *sk)
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{
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atomic_inc(&sk->sk_refcnt);
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}
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/* Ungrab socket in the context, which assumes that socket refcnt
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cannot hit zero, f.e. it is true in context of any socketcall.
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*/
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static inline void __sock_put(struct sock *sk)
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{
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atomic_dec(&sk->sk_refcnt);
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}
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static __inline__ int sk_del_node_init(struct sock *sk)
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{
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int rc = __sk_del_node_init(sk);
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if (rc) {
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/* paranoid for a while -acme */
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WARN_ON(atomic_read(&sk->sk_refcnt) == 1);
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__sock_put(sk);
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}
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return rc;
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}
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static __inline__ void __sk_add_node(struct sock *sk, struct hlist_head *list)
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{
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hlist_add_head(&sk->sk_node, list);
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}
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static __inline__ void sk_add_node(struct sock *sk, struct hlist_head *list)
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{
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sock_hold(sk);
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__sk_add_node(sk, list);
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}
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static __inline__ void __sk_del_bind_node(struct sock *sk)
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{
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__hlist_del(&sk->sk_bind_node);
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}
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static __inline__ void sk_add_bind_node(struct sock *sk,
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struct hlist_head *list)
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{
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hlist_add_head(&sk->sk_bind_node, list);
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}
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#define sk_for_each(__sk, node, list) \
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hlist_for_each_entry(__sk, node, list, sk_node)
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#define sk_for_each_from(__sk, node) \
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if (__sk && ({ node = &(__sk)->sk_node; 1; })) \
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hlist_for_each_entry_from(__sk, node, sk_node)
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#define sk_for_each_continue(__sk, node) \
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if (__sk && ({ node = &(__sk)->sk_node; 1; })) \
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hlist_for_each_entry_continue(__sk, node, sk_node)
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#define sk_for_each_safe(__sk, node, tmp, list) \
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hlist_for_each_entry_safe(__sk, node, tmp, list, sk_node)
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#define sk_for_each_bound(__sk, node, list) \
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hlist_for_each_entry(__sk, node, list, sk_bind_node)
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/* Sock flags */
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enum sock_flags {
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SOCK_DEAD,
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SOCK_DONE,
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SOCK_URGINLINE,
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SOCK_KEEPOPEN,
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SOCK_LINGER,
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SOCK_DESTROY,
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SOCK_BROADCAST,
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SOCK_TIMESTAMP,
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SOCK_ZAPPED,
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SOCK_USE_WRITE_QUEUE, /* whether to call sk->sk_write_space in sock_wfree */
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SOCK_DBG, /* %SO_DEBUG setting */
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SOCK_RCVTSTAMP, /* %SO_TIMESTAMP setting */
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SOCK_RCVTSTAMPNS, /* %SO_TIMESTAMPNS setting */
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SOCK_LOCALROUTE, /* route locally only, %SO_DONTROUTE setting */
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SOCK_QUEUE_SHRUNK, /* write queue has been shrunk recently */
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};
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static inline void sock_copy_flags(struct sock *nsk, struct sock *osk)
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{
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nsk->sk_flags = osk->sk_flags;
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}
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static inline void sock_set_flag(struct sock *sk, enum sock_flags flag)
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{
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__set_bit(flag, &sk->sk_flags);
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}
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static inline void sock_reset_flag(struct sock *sk, enum sock_flags flag)
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{
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__clear_bit(flag, &sk->sk_flags);
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}
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static inline int sock_flag(struct sock *sk, enum sock_flags flag)
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{
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return test_bit(flag, &sk->sk_flags);
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}
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static inline void sk_acceptq_removed(struct sock *sk)
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{
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sk->sk_ack_backlog--;
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}
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static inline void sk_acceptq_added(struct sock *sk)
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{
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sk->sk_ack_backlog++;
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}
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static inline int sk_acceptq_is_full(struct sock *sk)
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{
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return sk->sk_ack_backlog > sk->sk_max_ack_backlog;
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}
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|
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/*
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* Compute minimal free write space needed to queue new packets.
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*/
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static inline int sk_stream_min_wspace(struct sock *sk)
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{
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return sk->sk_wmem_queued / 2;
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}
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static inline int sk_stream_wspace(struct sock *sk)
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{
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return sk->sk_sndbuf - sk->sk_wmem_queued;
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}
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|
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extern void sk_stream_write_space(struct sock *sk);
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static inline int sk_stream_memory_free(struct sock *sk)
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{
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return sk->sk_wmem_queued < sk->sk_sndbuf;
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}
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|
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extern void sk_stream_rfree(struct sk_buff *skb);
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|
|
static inline void sk_stream_set_owner_r(struct sk_buff *skb, struct sock *sk)
|
|
{
|
|
skb->sk = sk;
|
|
skb->destructor = sk_stream_rfree;
|
|
atomic_add(skb->truesize, &sk->sk_rmem_alloc);
|
|
sk->sk_forward_alloc -= skb->truesize;
|
|
}
|
|
|
|
static inline void sk_stream_free_skb(struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
skb_truesize_check(skb);
|
|
sock_set_flag(sk, SOCK_QUEUE_SHRUNK);
|
|
sk->sk_wmem_queued -= skb->truesize;
|
|
sk->sk_forward_alloc += skb->truesize;
|
|
__kfree_skb(skb);
|
|
}
|
|
|
|
/* The per-socket spinlock must be held here. */
|
|
static inline void sk_add_backlog(struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
if (!sk->sk_backlog.tail) {
|
|
sk->sk_backlog.head = sk->sk_backlog.tail = skb;
|
|
} else {
|
|
sk->sk_backlog.tail->next = skb;
|
|
sk->sk_backlog.tail = skb;
|
|
}
|
|
skb->next = NULL;
|
|
}
|
|
|
|
#define sk_wait_event(__sk, __timeo, __condition) \
|
|
({ int __rc; \
|
|
release_sock(__sk); \
|
|
__rc = __condition; \
|
|
if (!__rc) { \
|
|
*(__timeo) = schedule_timeout(*(__timeo)); \
|
|
} \
|
|
lock_sock(__sk); \
|
|
__rc = __condition; \
|
|
__rc; \
|
|
})
|
|
|
|
extern int sk_stream_wait_connect(struct sock *sk, long *timeo_p);
|
|
extern int sk_stream_wait_memory(struct sock *sk, long *timeo_p);
|
|
extern void sk_stream_wait_close(struct sock *sk, long timeo_p);
|
|
extern int sk_stream_error(struct sock *sk, int flags, int err);
|
|
extern void sk_stream_kill_queues(struct sock *sk);
|
|
|
|
extern int sk_wait_data(struct sock *sk, long *timeo);
|
|
|
|
struct request_sock_ops;
|
|
struct timewait_sock_ops;
|
|
|
|
/* Networking protocol blocks we attach to sockets.
|
|
* socket layer -> transport layer interface
|
|
* transport -> network interface is defined by struct inet_proto
|
|
*/
|
|
struct proto {
|
|
void (*close)(struct sock *sk,
|
|
long timeout);
|
|
int (*connect)(struct sock *sk,
|
|
struct sockaddr *uaddr,
|
|
int addr_len);
|
|
int (*disconnect)(struct sock *sk, int flags);
|
|
|
|
struct sock * (*accept) (struct sock *sk, int flags, int *err);
|
|
|
|
int (*ioctl)(struct sock *sk, int cmd,
|
|
unsigned long arg);
|
|
int (*init)(struct sock *sk);
|
|
int (*destroy)(struct sock *sk);
|
|
void (*shutdown)(struct sock *sk, int how);
|
|
int (*setsockopt)(struct sock *sk, int level,
|
|
int optname, char __user *optval,
|
|
int optlen);
|
|
int (*getsockopt)(struct sock *sk, int level,
|
|
int optname, char __user *optval,
|
|
int __user *option);
|
|
int (*compat_setsockopt)(struct sock *sk,
|
|
int level,
|
|
int optname, char __user *optval,
|
|
int optlen);
|
|
int (*compat_getsockopt)(struct sock *sk,
|
|
int level,
|
|
int optname, char __user *optval,
|
|
int __user *option);
|
|
int (*sendmsg)(struct kiocb *iocb, struct sock *sk,
|
|
struct msghdr *msg, size_t len);
|
|
int (*recvmsg)(struct kiocb *iocb, struct sock *sk,
|
|
struct msghdr *msg,
|
|
size_t len, int noblock, int flags,
|
|
int *addr_len);
|
|
int (*sendpage)(struct sock *sk, struct page *page,
|
|
int offset, size_t size, int flags);
|
|
int (*bind)(struct sock *sk,
|
|
struct sockaddr *uaddr, int addr_len);
|
|
|
|
int (*backlog_rcv) (struct sock *sk,
|
|
struct sk_buff *skb);
|
|
|
|
/* Keeping track of sk's, looking them up, and port selection methods. */
|
|
void (*hash)(struct sock *sk);
|
|
void (*unhash)(struct sock *sk);
|
|
int (*get_port)(struct sock *sk, unsigned short snum);
|
|
|
|
#ifdef CONFIG_SMP
|
|
/* Keeping track of sockets in use */
|
|
void (*inuse_add)(struct proto *prot, int inc);
|
|
int (*inuse_getval)(const struct proto *prot);
|
|
int *inuse_ptr;
|
|
#else
|
|
int inuse;
|
|
#endif
|
|
/* Memory pressure */
|
|
void (*enter_memory_pressure)(void);
|
|
atomic_t *memory_allocated; /* Current allocated memory. */
|
|
atomic_t *sockets_allocated; /* Current number of sockets. */
|
|
/*
|
|
* Pressure flag: try to collapse.
|
|
* Technical note: it is used by multiple contexts non atomically.
|
|
* All the sk_stream_mem_schedule() is of this nature: accounting
|
|
* is strict, actions are advisory and have some latency.
|
|
*/
|
|
int *memory_pressure;
|
|
int *sysctl_mem;
|
|
int *sysctl_wmem;
|
|
int *sysctl_rmem;
|
|
int max_header;
|
|
|
|
struct kmem_cache *slab;
|
|
unsigned int obj_size;
|
|
|
|
atomic_t *orphan_count;
|
|
|
|
struct request_sock_ops *rsk_prot;
|
|
struct timewait_sock_ops *twsk_prot;
|
|
|
|
struct module *owner;
|
|
|
|
char name[32];
|
|
|
|
struct list_head node;
|
|
#ifdef SOCK_REFCNT_DEBUG
|
|
atomic_t socks;
|
|
#endif
|
|
};
|
|
|
|
/*
|
|
* Special macros to let protos use a fast version of inuse{get|add}
|
|
* using a static percpu variable per proto instead of an allocated one,
|
|
* saving one dereference.
|
|
* This might be changed if/when dynamic percpu vars become fast.
|
|
*/
|
|
#ifdef CONFIG_SMP
|
|
# define DEFINE_PROTO_INUSE(NAME) \
|
|
static DEFINE_PER_CPU(int, NAME##_inuse); \
|
|
static void NAME##_inuse_add(struct proto *prot, int inc) \
|
|
{ \
|
|
__get_cpu_var(NAME##_inuse) += inc; \
|
|
} \
|
|
\
|
|
static int NAME##_inuse_getval(const struct proto *prot)\
|
|
{ \
|
|
int res = 0, cpu; \
|
|
\
|
|
for_each_possible_cpu(cpu) \
|
|
res += per_cpu(NAME##_inuse, cpu); \
|
|
return res; \
|
|
}
|
|
# define REF_PROTO_INUSE(NAME) \
|
|
.inuse_add = NAME##_inuse_add, \
|
|
.inuse_getval = NAME##_inuse_getval,
|
|
#else
|
|
# define DEFINE_PROTO_INUSE(NAME)
|
|
# define REF_PROTO_INUSE(NAME)
|
|
#endif
|
|
|
|
extern int proto_register(struct proto *prot, int alloc_slab);
|
|
extern void proto_unregister(struct proto *prot);
|
|
|
|
#ifdef SOCK_REFCNT_DEBUG
|
|
static inline void sk_refcnt_debug_inc(struct sock *sk)
|
|
{
|
|
atomic_inc(&sk->sk_prot->socks);
|
|
}
|
|
|
|
static inline void sk_refcnt_debug_dec(struct sock *sk)
|
|
{
|
|
atomic_dec(&sk->sk_prot->socks);
|
|
printk(KERN_DEBUG "%s socket %p released, %d are still alive\n",
|
|
sk->sk_prot->name, sk, atomic_read(&sk->sk_prot->socks));
|
|
}
|
|
|
|
static inline void sk_refcnt_debug_release(const struct sock *sk)
|
|
{
|
|
if (atomic_read(&sk->sk_refcnt) != 1)
|
|
printk(KERN_DEBUG "Destruction of the %s socket %p delayed, refcnt=%d\n",
|
|
sk->sk_prot->name, sk, atomic_read(&sk->sk_refcnt));
|
|
}
|
|
#else /* SOCK_REFCNT_DEBUG */
|
|
#define sk_refcnt_debug_inc(sk) do { } while (0)
|
|
#define sk_refcnt_debug_dec(sk) do { } while (0)
|
|
#define sk_refcnt_debug_release(sk) do { } while (0)
|
|
#endif /* SOCK_REFCNT_DEBUG */
|
|
|
|
/* Called with local bh disabled */
|
|
static __inline__ void sock_prot_inc_use(struct proto *prot)
|
|
{
|
|
#ifdef CONFIG_SMP
|
|
prot->inuse_add(prot, 1);
|
|
#else
|
|
prot->inuse++;
|
|
#endif
|
|
}
|
|
|
|
static __inline__ void sock_prot_dec_use(struct proto *prot)
|
|
{
|
|
#ifdef CONFIG_SMP
|
|
prot->inuse_add(prot, -1);
|
|
#else
|
|
prot->inuse--;
|
|
#endif
|
|
}
|
|
|
|
static __inline__ int sock_prot_inuse(struct proto *proto)
|
|
{
|
|
#ifdef CONFIG_SMP
|
|
return proto->inuse_getval(proto);
|
|
#else
|
|
return proto->inuse;
|
|
#endif
|
|
}
|
|
|
|
/* With per-bucket locks this operation is not-atomic, so that
|
|
* this version is not worse.
|
|
*/
|
|
static inline void __sk_prot_rehash(struct sock *sk)
|
|
{
|
|
sk->sk_prot->unhash(sk);
|
|
sk->sk_prot->hash(sk);
|
|
}
|
|
|
|
/* About 10 seconds */
|
|
#define SOCK_DESTROY_TIME (10*HZ)
|
|
|
|
/* Sockets 0-1023 can't be bound to unless you are superuser */
|
|
#define PROT_SOCK 1024
|
|
|
|
#define SHUTDOWN_MASK 3
|
|
#define RCV_SHUTDOWN 1
|
|
#define SEND_SHUTDOWN 2
|
|
|
|
#define SOCK_SNDBUF_LOCK 1
|
|
#define SOCK_RCVBUF_LOCK 2
|
|
#define SOCK_BINDADDR_LOCK 4
|
|
#define SOCK_BINDPORT_LOCK 8
|
|
|
|
/* sock_iocb: used to kick off async processing of socket ios */
|
|
struct sock_iocb {
|
|
struct list_head list;
|
|
|
|
int flags;
|
|
int size;
|
|
struct socket *sock;
|
|
struct sock *sk;
|
|
struct scm_cookie *scm;
|
|
struct msghdr *msg, async_msg;
|
|
struct kiocb *kiocb;
|
|
};
|
|
|
|
static inline struct sock_iocb *kiocb_to_siocb(struct kiocb *iocb)
|
|
{
|
|
return (struct sock_iocb *)iocb->private;
|
|
}
|
|
|
|
static inline struct kiocb *siocb_to_kiocb(struct sock_iocb *si)
|
|
{
|
|
return si->kiocb;
|
|
}
|
|
|
|
struct socket_alloc {
|
|
struct socket socket;
|
|
struct inode vfs_inode;
|
|
};
|
|
|
|
static inline struct socket *SOCKET_I(struct inode *inode)
|
|
{
|
|
return &container_of(inode, struct socket_alloc, vfs_inode)->socket;
|
|
}
|
|
|
|
static inline struct inode *SOCK_INODE(struct socket *socket)
|
|
{
|
|
return &container_of(socket, struct socket_alloc, socket)->vfs_inode;
|
|
}
|
|
|
|
extern void __sk_stream_mem_reclaim(struct sock *sk);
|
|
extern int sk_stream_mem_schedule(struct sock *sk, int size, int kind);
|
|
|
|
#define SK_STREAM_MEM_QUANTUM ((int)PAGE_SIZE)
|
|
|
|
static inline int sk_stream_pages(int amt)
|
|
{
|
|
return DIV_ROUND_UP(amt, SK_STREAM_MEM_QUANTUM);
|
|
}
|
|
|
|
static inline void sk_stream_mem_reclaim(struct sock *sk)
|
|
{
|
|
if (sk->sk_forward_alloc >= SK_STREAM_MEM_QUANTUM)
|
|
__sk_stream_mem_reclaim(sk);
|
|
}
|
|
|
|
static inline int sk_stream_rmem_schedule(struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
return (int)skb->truesize <= sk->sk_forward_alloc ||
|
|
sk_stream_mem_schedule(sk, skb->truesize, 1);
|
|
}
|
|
|
|
static inline int sk_stream_wmem_schedule(struct sock *sk, int size)
|
|
{
|
|
return size <= sk->sk_forward_alloc ||
|
|
sk_stream_mem_schedule(sk, size, 0);
|
|
}
|
|
|
|
/* Used by processes to "lock" a socket state, so that
|
|
* interrupts and bottom half handlers won't change it
|
|
* from under us. It essentially blocks any incoming
|
|
* packets, so that we won't get any new data or any
|
|
* packets that change the state of the socket.
|
|
*
|
|
* While locked, BH processing will add new packets to
|
|
* the backlog queue. This queue is processed by the
|
|
* owner of the socket lock right before it is released.
|
|
*
|
|
* Since ~2.3.5 it is also exclusive sleep lock serializing
|
|
* accesses from user process context.
|
|
*/
|
|
#define sock_owned_by_user(sk) ((sk)->sk_lock.owned)
|
|
|
|
/*
|
|
* Macro so as to not evaluate some arguments when
|
|
* lockdep is not enabled.
|
|
*
|
|
* Mark both the sk_lock and the sk_lock.slock as a
|
|
* per-address-family lock class.
|
|
*/
|
|
#define sock_lock_init_class_and_name(sk, sname, skey, name, key) \
|
|
do { \
|
|
sk->sk_lock.owned = 0; \
|
|
init_waitqueue_head(&sk->sk_lock.wq); \
|
|
spin_lock_init(&(sk)->sk_lock.slock); \
|
|
debug_check_no_locks_freed((void *)&(sk)->sk_lock, \
|
|
sizeof((sk)->sk_lock)); \
|
|
lockdep_set_class_and_name(&(sk)->sk_lock.slock, \
|
|
(skey), (sname)); \
|
|
lockdep_init_map(&(sk)->sk_lock.dep_map, (name), (key), 0); \
|
|
} while (0)
|
|
|
|
extern void FASTCALL(lock_sock_nested(struct sock *sk, int subclass));
|
|
|
|
static inline void lock_sock(struct sock *sk)
|
|
{
|
|
lock_sock_nested(sk, 0);
|
|
}
|
|
|
|
extern void FASTCALL(release_sock(struct sock *sk));
|
|
|
|
/* BH context may only use the following locking interface. */
|
|
#define bh_lock_sock(__sk) spin_lock(&((__sk)->sk_lock.slock))
|
|
#define bh_lock_sock_nested(__sk) \
|
|
spin_lock_nested(&((__sk)->sk_lock.slock), \
|
|
SINGLE_DEPTH_NESTING)
|
|
#define bh_unlock_sock(__sk) spin_unlock(&((__sk)->sk_lock.slock))
|
|
|
|
extern struct sock *sk_alloc(struct net *net, int family,
|
|
gfp_t priority,
|
|
struct proto *prot);
|
|
extern void sk_free(struct sock *sk);
|
|
extern struct sock *sk_clone(const struct sock *sk,
|
|
const gfp_t priority);
|
|
|
|
extern struct sk_buff *sock_wmalloc(struct sock *sk,
|
|
unsigned long size, int force,
|
|
gfp_t priority);
|
|
extern struct sk_buff *sock_rmalloc(struct sock *sk,
|
|
unsigned long size, int force,
|
|
gfp_t priority);
|
|
extern void sock_wfree(struct sk_buff *skb);
|
|
extern void sock_rfree(struct sk_buff *skb);
|
|
|
|
extern int sock_setsockopt(struct socket *sock, int level,
|
|
int op, char __user *optval,
|
|
int optlen);
|
|
|
|
extern int sock_getsockopt(struct socket *sock, int level,
|
|
int op, char __user *optval,
|
|
int __user *optlen);
|
|
extern struct sk_buff *sock_alloc_send_skb(struct sock *sk,
|
|
unsigned long size,
|
|
int noblock,
|
|
int *errcode);
|
|
extern void *sock_kmalloc(struct sock *sk, int size,
|
|
gfp_t priority);
|
|
extern void sock_kfree_s(struct sock *sk, void *mem, int size);
|
|
extern void sk_send_sigurg(struct sock *sk);
|
|
|
|
/*
|
|
* Functions to fill in entries in struct proto_ops when a protocol
|
|
* does not implement a particular function.
|
|
*/
|
|
extern int sock_no_bind(struct socket *,
|
|
struct sockaddr *, int);
|
|
extern int sock_no_connect(struct socket *,
|
|
struct sockaddr *, int, int);
|
|
extern int sock_no_socketpair(struct socket *,
|
|
struct socket *);
|
|
extern int sock_no_accept(struct socket *,
|
|
struct socket *, int);
|
|
extern int sock_no_getname(struct socket *,
|
|
struct sockaddr *, int *, int);
|
|
extern unsigned int sock_no_poll(struct file *, struct socket *,
|
|
struct poll_table_struct *);
|
|
extern int sock_no_ioctl(struct socket *, unsigned int,
|
|
unsigned long);
|
|
extern int sock_no_listen(struct socket *, int);
|
|
extern int sock_no_shutdown(struct socket *, int);
|
|
extern int sock_no_getsockopt(struct socket *, int , int,
|
|
char __user *, int __user *);
|
|
extern int sock_no_setsockopt(struct socket *, int, int,
|
|
char __user *, int);
|
|
extern int sock_no_sendmsg(struct kiocb *, struct socket *,
|
|
struct msghdr *, size_t);
|
|
extern int sock_no_recvmsg(struct kiocb *, struct socket *,
|
|
struct msghdr *, size_t, int);
|
|
extern int sock_no_mmap(struct file *file,
|
|
struct socket *sock,
|
|
struct vm_area_struct *vma);
|
|
extern ssize_t sock_no_sendpage(struct socket *sock,
|
|
struct page *page,
|
|
int offset, size_t size,
|
|
int flags);
|
|
|
|
/*
|
|
* Functions to fill in entries in struct proto_ops when a protocol
|
|
* uses the inet style.
|
|
*/
|
|
extern int sock_common_getsockopt(struct socket *sock, int level, int optname,
|
|
char __user *optval, int __user *optlen);
|
|
extern int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
|
|
struct msghdr *msg, size_t size, int flags);
|
|
extern int sock_common_setsockopt(struct socket *sock, int level, int optname,
|
|
char __user *optval, int optlen);
|
|
extern int compat_sock_common_getsockopt(struct socket *sock, int level,
|
|
int optname, char __user *optval, int __user *optlen);
|
|
extern int compat_sock_common_setsockopt(struct socket *sock, int level,
|
|
int optname, char __user *optval, int optlen);
|
|
|
|
extern void sk_common_release(struct sock *sk);
|
|
|
|
/*
|
|
* Default socket callbacks and setup code
|
|
*/
|
|
|
|
/* Initialise core socket variables */
|
|
extern void sock_init_data(struct socket *sock, struct sock *sk);
|
|
|
|
/**
|
|
* sk_filter - run a packet through a socket filter
|
|
* @sk: sock associated with &sk_buff
|
|
* @skb: buffer to filter
|
|
* @needlock: set to 1 if the sock is not locked by caller.
|
|
*
|
|
* Run the filter code and then cut skb->data to correct size returned by
|
|
* sk_run_filter. If pkt_len is 0 we toss packet. If skb->len is smaller
|
|
* than pkt_len we keep whole skb->data. This is the socket level
|
|
* wrapper to sk_run_filter. It returns 0 if the packet should
|
|
* be accepted or -EPERM if the packet should be tossed.
|
|
*
|
|
*/
|
|
|
|
static inline int sk_filter(struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
int err;
|
|
struct sk_filter *filter;
|
|
|
|
err = security_sock_rcv_skb(sk, skb);
|
|
if (err)
|
|
return err;
|
|
|
|
rcu_read_lock_bh();
|
|
filter = sk->sk_filter;
|
|
if (filter) {
|
|
unsigned int pkt_len = sk_run_filter(skb, filter->insns,
|
|
filter->len);
|
|
err = pkt_len ? pskb_trim(skb, pkt_len) : -EPERM;
|
|
}
|
|
rcu_read_unlock_bh();
|
|
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* sk_filter_release: Release a socket filter
|
|
* @sk: socket
|
|
* @fp: filter to remove
|
|
*
|
|
* Remove a filter from a socket and release its resources.
|
|
*/
|
|
|
|
static inline void sk_filter_release(struct sk_filter *fp)
|
|
{
|
|
if (atomic_dec_and_test(&fp->refcnt))
|
|
kfree(fp);
|
|
}
|
|
|
|
static inline void sk_filter_uncharge(struct sock *sk, struct sk_filter *fp)
|
|
{
|
|
unsigned int size = sk_filter_len(fp);
|
|
|
|
atomic_sub(size, &sk->sk_omem_alloc);
|
|
sk_filter_release(fp);
|
|
}
|
|
|
|
static inline void sk_filter_charge(struct sock *sk, struct sk_filter *fp)
|
|
{
|
|
atomic_inc(&fp->refcnt);
|
|
atomic_add(sk_filter_len(fp), &sk->sk_omem_alloc);
|
|
}
|
|
|
|
/*
|
|
* Socket reference counting postulates.
|
|
*
|
|
* * Each user of socket SHOULD hold a reference count.
|
|
* * Each access point to socket (an hash table bucket, reference from a list,
|
|
* running timer, skb in flight MUST hold a reference count.
|
|
* * When reference count hits 0, it means it will never increase back.
|
|
* * When reference count hits 0, it means that no references from
|
|
* outside exist to this socket and current process on current CPU
|
|
* is last user and may/should destroy this socket.
|
|
* * sk_free is called from any context: process, BH, IRQ. When
|
|
* it is called, socket has no references from outside -> sk_free
|
|
* may release descendant resources allocated by the socket, but
|
|
* to the time when it is called, socket is NOT referenced by any
|
|
* hash tables, lists etc.
|
|
* * Packets, delivered from outside (from network or from another process)
|
|
* and enqueued on receive/error queues SHOULD NOT grab reference count,
|
|
* when they sit in queue. Otherwise, packets will leak to hole, when
|
|
* socket is looked up by one cpu and unhasing is made by another CPU.
|
|
* It is true for udp/raw, netlink (leak to receive and error queues), tcp
|
|
* (leak to backlog). Packet socket does all the processing inside
|
|
* BR_NETPROTO_LOCK, so that it has not this race condition. UNIX sockets
|
|
* use separate SMP lock, so that they are prone too.
|
|
*/
|
|
|
|
/* Ungrab socket and destroy it, if it was the last reference. */
|
|
static inline void sock_put(struct sock *sk)
|
|
{
|
|
if (atomic_dec_and_test(&sk->sk_refcnt))
|
|
sk_free(sk);
|
|
}
|
|
|
|
extern int sk_receive_skb(struct sock *sk, struct sk_buff *skb,
|
|
const int nested);
|
|
|
|
/* Detach socket from process context.
|
|
* Announce socket dead, detach it from wait queue and inode.
|
|
* Note that parent inode held reference count on this struct sock,
|
|
* we do not release it in this function, because protocol
|
|
* probably wants some additional cleanups or even continuing
|
|
* to work with this socket (TCP).
|
|
*/
|
|
static inline void sock_orphan(struct sock *sk)
|
|
{
|
|
write_lock_bh(&sk->sk_callback_lock);
|
|
sock_set_flag(sk, SOCK_DEAD);
|
|
sk->sk_socket = NULL;
|
|
sk->sk_sleep = NULL;
|
|
write_unlock_bh(&sk->sk_callback_lock);
|
|
}
|
|
|
|
static inline void sock_graft(struct sock *sk, struct socket *parent)
|
|
{
|
|
write_lock_bh(&sk->sk_callback_lock);
|
|
sk->sk_sleep = &parent->wait;
|
|
parent->sk = sk;
|
|
sk->sk_socket = parent;
|
|
security_sock_graft(sk, parent);
|
|
write_unlock_bh(&sk->sk_callback_lock);
|
|
}
|
|
|
|
extern int sock_i_uid(struct sock *sk);
|
|
extern unsigned long sock_i_ino(struct sock *sk);
|
|
|
|
static inline struct dst_entry *
|
|
__sk_dst_get(struct sock *sk)
|
|
{
|
|
return sk->sk_dst_cache;
|
|
}
|
|
|
|
static inline struct dst_entry *
|
|
sk_dst_get(struct sock *sk)
|
|
{
|
|
struct dst_entry *dst;
|
|
|
|
read_lock(&sk->sk_dst_lock);
|
|
dst = sk->sk_dst_cache;
|
|
if (dst)
|
|
dst_hold(dst);
|
|
read_unlock(&sk->sk_dst_lock);
|
|
return dst;
|
|
}
|
|
|
|
static inline void
|
|
__sk_dst_set(struct sock *sk, struct dst_entry *dst)
|
|
{
|
|
struct dst_entry *old_dst;
|
|
|
|
old_dst = sk->sk_dst_cache;
|
|
sk->sk_dst_cache = dst;
|
|
dst_release(old_dst);
|
|
}
|
|
|
|
static inline void
|
|
sk_dst_set(struct sock *sk, struct dst_entry *dst)
|
|
{
|
|
write_lock(&sk->sk_dst_lock);
|
|
__sk_dst_set(sk, dst);
|
|
write_unlock(&sk->sk_dst_lock);
|
|
}
|
|
|
|
static inline void
|
|
__sk_dst_reset(struct sock *sk)
|
|
{
|
|
struct dst_entry *old_dst;
|
|
|
|
old_dst = sk->sk_dst_cache;
|
|
sk->sk_dst_cache = NULL;
|
|
dst_release(old_dst);
|
|
}
|
|
|
|
static inline void
|
|
sk_dst_reset(struct sock *sk)
|
|
{
|
|
write_lock(&sk->sk_dst_lock);
|
|
__sk_dst_reset(sk);
|
|
write_unlock(&sk->sk_dst_lock);
|
|
}
|
|
|
|
extern struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie);
|
|
|
|
extern struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie);
|
|
|
|
static inline int sk_can_gso(const struct sock *sk)
|
|
{
|
|
return net_gso_ok(sk->sk_route_caps, sk->sk_gso_type);
|
|
}
|
|
|
|
extern void sk_setup_caps(struct sock *sk, struct dst_entry *dst);
|
|
|
|
static inline void sk_charge_skb(struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
sk->sk_wmem_queued += skb->truesize;
|
|
sk->sk_forward_alloc -= skb->truesize;
|
|
}
|
|
|
|
static inline int skb_copy_to_page(struct sock *sk, char __user *from,
|
|
struct sk_buff *skb, struct page *page,
|
|
int off, int copy)
|
|
{
|
|
if (skb->ip_summed == CHECKSUM_NONE) {
|
|
int err = 0;
|
|
__wsum csum = csum_and_copy_from_user(from,
|
|
page_address(page) + off,
|
|
copy, 0, &err);
|
|
if (err)
|
|
return err;
|
|
skb->csum = csum_block_add(skb->csum, csum, skb->len);
|
|
} else if (copy_from_user(page_address(page) + off, from, copy))
|
|
return -EFAULT;
|
|
|
|
skb->len += copy;
|
|
skb->data_len += copy;
|
|
skb->truesize += copy;
|
|
sk->sk_wmem_queued += copy;
|
|
sk->sk_forward_alloc -= copy;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Queue a received datagram if it will fit. Stream and sequenced
|
|
* protocols can't normally use this as they need to fit buffers in
|
|
* and play with them.
|
|
*
|
|
* Inlined as it's very short and called for pretty much every
|
|
* packet ever received.
|
|
*/
|
|
|
|
static inline void skb_set_owner_w(struct sk_buff *skb, struct sock *sk)
|
|
{
|
|
sock_hold(sk);
|
|
skb->sk = sk;
|
|
skb->destructor = sock_wfree;
|
|
atomic_add(skb->truesize, &sk->sk_wmem_alloc);
|
|
}
|
|
|
|
static inline void skb_set_owner_r(struct sk_buff *skb, struct sock *sk)
|
|
{
|
|
skb->sk = sk;
|
|
skb->destructor = sock_rfree;
|
|
atomic_add(skb->truesize, &sk->sk_rmem_alloc);
|
|
}
|
|
|
|
extern void sk_reset_timer(struct sock *sk, struct timer_list* timer,
|
|
unsigned long expires);
|
|
|
|
extern void sk_stop_timer(struct sock *sk, struct timer_list* timer);
|
|
|
|
extern int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb);
|
|
|
|
static inline int sock_queue_err_skb(struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
/* Cast skb->rcvbuf to unsigned... It's pointless, but reduces
|
|
number of warnings when compiling with -W --ANK
|
|
*/
|
|
if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >=
|
|
(unsigned)sk->sk_rcvbuf)
|
|
return -ENOMEM;
|
|
skb_set_owner_r(skb, sk);
|
|
skb_queue_tail(&sk->sk_error_queue, skb);
|
|
if (!sock_flag(sk, SOCK_DEAD))
|
|
sk->sk_data_ready(sk, skb->len);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Recover an error report and clear atomically
|
|
*/
|
|
|
|
static inline int sock_error(struct sock *sk)
|
|
{
|
|
int err;
|
|
if (likely(!sk->sk_err))
|
|
return 0;
|
|
err = xchg(&sk->sk_err, 0);
|
|
return -err;
|
|
}
|
|
|
|
static inline unsigned long sock_wspace(struct sock *sk)
|
|
{
|
|
int amt = 0;
|
|
|
|
if (!(sk->sk_shutdown & SEND_SHUTDOWN)) {
|
|
amt = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc);
|
|
if (amt < 0)
|
|
amt = 0;
|
|
}
|
|
return amt;
|
|
}
|
|
|
|
static inline void sk_wake_async(struct sock *sk, int how, int band)
|
|
{
|
|
if (sk->sk_socket && sk->sk_socket->fasync_list)
|
|
sock_wake_async(sk->sk_socket, how, band);
|
|
}
|
|
|
|
#define SOCK_MIN_SNDBUF 2048
|
|
#define SOCK_MIN_RCVBUF 256
|
|
|
|
static inline void sk_stream_moderate_sndbuf(struct sock *sk)
|
|
{
|
|
if (!(sk->sk_userlocks & SOCK_SNDBUF_LOCK)) {
|
|
sk->sk_sndbuf = min(sk->sk_sndbuf, sk->sk_wmem_queued / 2);
|
|
sk->sk_sndbuf = max(sk->sk_sndbuf, SOCK_MIN_SNDBUF);
|
|
}
|
|
}
|
|
|
|
static inline struct sk_buff *sk_stream_alloc_pskb(struct sock *sk,
|
|
int size, int mem,
|
|
gfp_t gfp)
|
|
{
|
|
struct sk_buff *skb;
|
|
int hdr_len;
|
|
|
|
hdr_len = SKB_DATA_ALIGN(sk->sk_prot->max_header);
|
|
skb = alloc_skb_fclone(size + hdr_len, gfp);
|
|
if (skb) {
|
|
skb->truesize += mem;
|
|
if (sk_stream_wmem_schedule(sk, skb->truesize)) {
|
|
skb_reserve(skb, hdr_len);
|
|
return skb;
|
|
}
|
|
__kfree_skb(skb);
|
|
} else {
|
|
sk->sk_prot->enter_memory_pressure();
|
|
sk_stream_moderate_sndbuf(sk);
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static inline struct sk_buff *sk_stream_alloc_skb(struct sock *sk,
|
|
int size,
|
|
gfp_t gfp)
|
|
{
|
|
return sk_stream_alloc_pskb(sk, size, 0, gfp);
|
|
}
|
|
|
|
static inline struct page *sk_stream_alloc_page(struct sock *sk)
|
|
{
|
|
struct page *page = NULL;
|
|
|
|
page = alloc_pages(sk->sk_allocation, 0);
|
|
if (!page) {
|
|
sk->sk_prot->enter_memory_pressure();
|
|
sk_stream_moderate_sndbuf(sk);
|
|
}
|
|
return page;
|
|
}
|
|
|
|
/*
|
|
* Default write policy as shown to user space via poll/select/SIGIO
|
|
*/
|
|
static inline int sock_writeable(const struct sock *sk)
|
|
{
|
|
return atomic_read(&sk->sk_wmem_alloc) < (sk->sk_sndbuf / 2);
|
|
}
|
|
|
|
static inline gfp_t gfp_any(void)
|
|
{
|
|
return in_atomic() ? GFP_ATOMIC : GFP_KERNEL;
|
|
}
|
|
|
|
static inline long sock_rcvtimeo(const struct sock *sk, int noblock)
|
|
{
|
|
return noblock ? 0 : sk->sk_rcvtimeo;
|
|
}
|
|
|
|
static inline long sock_sndtimeo(const struct sock *sk, int noblock)
|
|
{
|
|
return noblock ? 0 : sk->sk_sndtimeo;
|
|
}
|
|
|
|
static inline int sock_rcvlowat(const struct sock *sk, int waitall, int len)
|
|
{
|
|
return (waitall ? len : min_t(int, sk->sk_rcvlowat, len)) ? : 1;
|
|
}
|
|
|
|
/* Alas, with timeout socket operations are not restartable.
|
|
* Compare this to poll().
|
|
*/
|
|
static inline int sock_intr_errno(long timeo)
|
|
{
|
|
return timeo == MAX_SCHEDULE_TIMEOUT ? -ERESTARTSYS : -EINTR;
|
|
}
|
|
|
|
extern void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk,
|
|
struct sk_buff *skb);
|
|
|
|
static __inline__ void
|
|
sock_recv_timestamp(struct msghdr *msg, struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
ktime_t kt = skb->tstamp;
|
|
|
|
if (sock_flag(sk, SOCK_RCVTSTAMP))
|
|
__sock_recv_timestamp(msg, sk, skb);
|
|
else
|
|
sk->sk_stamp = kt;
|
|
}
|
|
|
|
/**
|
|
* sk_eat_skb - Release a skb if it is no longer needed
|
|
* @sk: socket to eat this skb from
|
|
* @skb: socket buffer to eat
|
|
* @copied_early: flag indicating whether DMA operations copied this data early
|
|
*
|
|
* This routine must be called with interrupts disabled or with the socket
|
|
* locked so that the sk_buff queue operation is ok.
|
|
*/
|
|
#ifdef CONFIG_NET_DMA
|
|
static inline void sk_eat_skb(struct sock *sk, struct sk_buff *skb, int copied_early)
|
|
{
|
|
__skb_unlink(skb, &sk->sk_receive_queue);
|
|
if (!copied_early)
|
|
__kfree_skb(skb);
|
|
else
|
|
__skb_queue_tail(&sk->sk_async_wait_queue, skb);
|
|
}
|
|
#else
|
|
static inline void sk_eat_skb(struct sock *sk, struct sk_buff *skb, int copied_early)
|
|
{
|
|
__skb_unlink(skb, &sk->sk_receive_queue);
|
|
__kfree_skb(skb);
|
|
}
|
|
#endif
|
|
|
|
extern void sock_enable_timestamp(struct sock *sk);
|
|
extern int sock_get_timestamp(struct sock *, struct timeval __user *);
|
|
extern int sock_get_timestampns(struct sock *, struct timespec __user *);
|
|
|
|
/*
|
|
* Enable debug/info messages
|
|
*/
|
|
extern int net_msg_warn;
|
|
#define NETDEBUG(fmt, args...) \
|
|
do { if (net_msg_warn) printk(fmt,##args); } while (0)
|
|
|
|
#define LIMIT_NETDEBUG(fmt, args...) \
|
|
do { if (net_msg_warn && net_ratelimit()) printk(fmt,##args); } while(0)
|
|
|
|
/*
|
|
* Macros for sleeping on a socket. Use them like this:
|
|
*
|
|
* SOCK_SLEEP_PRE(sk)
|
|
* if (condition)
|
|
* schedule();
|
|
* SOCK_SLEEP_POST(sk)
|
|
*
|
|
* N.B. These are now obsolete and were, afaik, only ever used in DECnet
|
|
* and when the last use of them in DECnet has gone, I'm intending to
|
|
* remove them.
|
|
*/
|
|
|
|
#define SOCK_SLEEP_PRE(sk) { struct task_struct *tsk = current; \
|
|
DECLARE_WAITQUEUE(wait, tsk); \
|
|
tsk->state = TASK_INTERRUPTIBLE; \
|
|
add_wait_queue((sk)->sk_sleep, &wait); \
|
|
release_sock(sk);
|
|
|
|
#define SOCK_SLEEP_POST(sk) tsk->state = TASK_RUNNING; \
|
|
remove_wait_queue((sk)->sk_sleep, &wait); \
|
|
lock_sock(sk); \
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
extern __u32 sysctl_wmem_max;
|
|
extern __u32 sysctl_rmem_max;
|
|
|
|
extern void sk_init(void);
|
|
|
|
#ifdef CONFIG_SYSCTL
|
|
extern struct ctl_table core_table[];
|
|
#endif
|
|
|
|
extern int sysctl_optmem_max;
|
|
|
|
extern __u32 sysctl_wmem_default;
|
|
extern __u32 sysctl_rmem_default;
|
|
|
|
#endif /* _SOCK_H */
|