![Geliang Tang](/assets/img/avatar_default.png)
Use hlist_entry_safe() instead of open-coding it. Signed-off-by: Geliang Tang <geliangtang@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2346 lines
65 KiB
C
2346 lines
65 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/hardirq.h>
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#include <linux/kernel.h>
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#include <linux/list.h>
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#include <linux/list_nulls.h>
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#include <linux/timer.h>
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#include <linux/cache.h>
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#include <linux/bitops.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/slab.h>
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#include <linux/uaccess.h>
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#include <linux/page_counter.h>
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#include <linux/memcontrol.h>
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#include <linux/static_key.h>
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#include <linux/sched.h>
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#include <linux/wait.h>
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#include <linux/cgroup-defs.h>
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#include <linux/filter.h>
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#include <linux/rculist_nulls.h>
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#include <linux/poll.h>
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#include <linux/atomic.h>
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#include <net/dst.h>
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#include <net/checksum.h>
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#include <net/tcp_states.h>
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#include <linux/net_tstamp.h>
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#include <net/smc.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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/* Validate arguments and do nothing */
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static inline __printf(2, 3)
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void SOCK_DEBUG(const struct sock *sk, const char *msg, ...)
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{
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}
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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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struct net;
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typedef __u32 __bitwise __portpair;
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typedef __u64 __bitwise __addrpair;
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/**
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* struct sock_common - minimal network layer representation of sockets
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* @skc_daddr: Foreign IPv4 addr
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* @skc_rcv_saddr: Bound local IPv4 addr
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* @skc_hash: hash value used with various protocol lookup tables
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* @skc_u16hashes: two u16 hash values used by UDP lookup tables
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* @skc_dport: placeholder for inet_dport/tw_dport
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* @skc_num: placeholder for inet_num/tw_num
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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_reuseport: %SO_REUSEPORT setting
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* @skc_bound_dev_if: bound device index if != 0
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* @skc_bind_node: bind hash linkage for various protocol lookup tables
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* @skc_portaddr_node: second hash linkage for UDP/UDP-Lite protocol
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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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* @skc_node: main hash linkage for various protocol lookup tables
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* @skc_nulls_node: main hash linkage for TCP/UDP/UDP-Lite protocol
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* @skc_tx_queue_mapping: tx queue number for this connection
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* @skc_flags: place holder for sk_flags
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* %SO_LINGER (l_onoff), %SO_BROADCAST, %SO_KEEPALIVE,
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* %SO_OOBINLINE settings, %SO_TIMESTAMPING settings
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* @skc_incoming_cpu: record/match cpu processing incoming packets
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* @skc_refcnt: reference count
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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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/* skc_daddr and skc_rcv_saddr must be grouped on a 8 bytes aligned
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* address on 64bit arches : cf INET_MATCH()
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*/
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union {
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__addrpair skc_addrpair;
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struct {
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__be32 skc_daddr;
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__be32 skc_rcv_saddr;
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};
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};
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union {
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unsigned int skc_hash;
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__u16 skc_u16hashes[2];
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};
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/* skc_dport && skc_num must be grouped as well */
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union {
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__portpair skc_portpair;
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struct {
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__be16 skc_dport;
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__u16 skc_num;
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};
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};
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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:4;
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unsigned char skc_reuseport:1;
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unsigned char skc_ipv6only:1;
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unsigned char skc_net_refcnt:1;
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int skc_bound_dev_if;
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union {
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struct hlist_node skc_bind_node;
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struct hlist_node skc_portaddr_node;
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};
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struct proto *skc_prot;
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possible_net_t skc_net;
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#if IS_ENABLED(CONFIG_IPV6)
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struct in6_addr skc_v6_daddr;
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struct in6_addr skc_v6_rcv_saddr;
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#endif
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atomic64_t skc_cookie;
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/* following fields are padding to force
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* offset(struct sock, sk_refcnt) == 128 on 64bit arches
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* assuming IPV6 is enabled. We use this padding differently
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* for different kind of 'sockets'
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*/
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union {
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unsigned long skc_flags;
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struct sock *skc_listener; /* request_sock */
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struct inet_timewait_death_row *skc_tw_dr; /* inet_timewait_sock */
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};
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/*
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* fields between dontcopy_begin/dontcopy_end
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* are not copied in sock_copy()
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*/
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/* private: */
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int skc_dontcopy_begin[0];
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/* public: */
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union {
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struct hlist_node skc_node;
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struct hlist_nulls_node skc_nulls_node;
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};
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int skc_tx_queue_mapping;
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union {
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int skc_incoming_cpu;
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u32 skc_rcv_wnd;
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u32 skc_tw_rcv_nxt; /* struct tcp_timewait_sock */
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};
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atomic_t skc_refcnt;
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/* private: */
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int skc_dontcopy_end[0];
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union {
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u32 skc_rxhash;
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u32 skc_window_clamp;
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u32 skc_tw_snd_nxt; /* struct tcp_timewait_sock */
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};
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/* public: */
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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_wq: sock wait queue and async head
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* @sk_rx_dst: receive input route used by early demux
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* @sk_dst_cache: destination cache
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* @sk_policy: flow policy
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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_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_napi_id: id of the last napi context to receive data for sk
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* @sk_ll_usec: usecs to busypoll when there is no data
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* @sk_allocation: allocation mode
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* @sk_pacing_rate: Pacing rate (if supported by transport/packet scheduler)
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* @sk_max_pacing_rate: Maximum pacing rate (%SO_MAX_PACING_RATE)
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* @sk_sndbuf: size of send buffer in bytes
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* @sk_padding: unused element for alignment
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* @sk_no_check_tx: %SO_NO_CHECK setting, set checksum in TX packets
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* @sk_no_check_rx: allow zero checksum in RX packets
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* @sk_route_caps: route capabilities (e.g. %NETIF_F_TSO)
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* @sk_route_nocaps: forbidden route capabilities (e.g NETIF_F_GSO_MASK)
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* @sk_gso_type: GSO type (e.g. %SKB_GSO_TCPV4)
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* @sk_gso_max_size: Maximum GSO segment size to build
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* @sk_gso_max_segs: Maximum number of GSO segments
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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,
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* 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
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* persistent failure not just 'timed out'
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* @sk_drops: raw/udp drops counter
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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_peer_pid: &struct pid for this socket's peer
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* @sk_peer_cred: %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_txhash: computed flow hash for use on transmit
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* @sk_filter: socket filtering instructions
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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_tsflags: SO_TIMESTAMPING socket options
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* @sk_tskey: counter to disambiguate concurrent tstamp requests
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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_frag: cached page frag
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* @sk_peek_off: current peek_offset value
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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_mark: generic packet mark
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* @sk_cgrp_data: cgroup data for this cgroup
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* @sk_memcg: this socket's memory cgroup association
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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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* @sk_reuseport_cb: reuseport group container
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* @sk_rcu: used during RCU grace period
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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_node __sk_common.skc_node
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#define sk_nulls_node __sk_common.skc_nulls_node
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#define sk_refcnt __sk_common.skc_refcnt
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#define sk_tx_queue_mapping __sk_common.skc_tx_queue_mapping
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#define sk_dontcopy_begin __sk_common.skc_dontcopy_begin
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#define sk_dontcopy_end __sk_common.skc_dontcopy_end
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#define sk_hash __sk_common.skc_hash
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#define sk_portpair __sk_common.skc_portpair
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#define sk_num __sk_common.skc_num
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#define sk_dport __sk_common.skc_dport
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#define sk_addrpair __sk_common.skc_addrpair
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#define sk_daddr __sk_common.skc_daddr
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#define sk_rcv_saddr __sk_common.skc_rcv_saddr
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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_reuseport __sk_common.skc_reuseport
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#define sk_ipv6only __sk_common.skc_ipv6only
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#define sk_net_refcnt __sk_common.skc_net_refcnt
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#define sk_bound_dev_if __sk_common.skc_bound_dev_if
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#define sk_bind_node __sk_common.skc_bind_node
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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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#define sk_v6_daddr __sk_common.skc_v6_daddr
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#define sk_v6_rcv_saddr __sk_common.skc_v6_rcv_saddr
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#define sk_cookie __sk_common.skc_cookie
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#define sk_incoming_cpu __sk_common.skc_incoming_cpu
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#define sk_flags __sk_common.skc_flags
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#define sk_rxhash __sk_common.skc_rxhash
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socket_lock_t sk_lock;
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atomic_t sk_drops;
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int sk_rcvlowat;
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struct sk_buff_head sk_error_queue;
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struct sk_buff_head sk_receive_queue;
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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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* Note : rmem_alloc is in this structure to fill a hole
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* on 64bit arches, not because its logically part of
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* backlog.
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*/
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struct {
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atomic_t rmem_alloc;
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int len;
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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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#define sk_rmem_alloc sk_backlog.rmem_alloc
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int sk_forward_alloc;
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#ifdef CONFIG_NET_RX_BUSY_POLL
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unsigned int sk_ll_usec;
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/* ===== mostly read cache line ===== */
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unsigned int sk_napi_id;
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#endif
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int sk_rcvbuf;
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struct sk_filter __rcu *sk_filter;
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union {
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struct socket_wq __rcu *sk_wq;
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struct socket_wq *sk_wq_raw;
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};
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#ifdef CONFIG_XFRM
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struct xfrm_policy __rcu *sk_policy[2];
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#endif
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struct dst_entry *sk_rx_dst;
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struct dst_entry __rcu *sk_dst_cache;
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atomic_t sk_omem_alloc;
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int sk_sndbuf;
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/* ===== cache line for TX ===== */
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int sk_wmem_queued;
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atomic_t sk_wmem_alloc;
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unsigned long sk_tsq_flags;
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struct sk_buff *sk_send_head;
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struct sk_buff_head sk_write_queue;
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__s32 sk_peek_off;
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int sk_write_pending;
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long sk_sndtimeo;
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struct timer_list sk_timer;
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__u32 sk_priority;
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__u32 sk_mark;
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u32 sk_pacing_rate; /* bytes per second */
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u32 sk_max_pacing_rate;
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struct page_frag sk_frag;
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netdev_features_t sk_route_caps;
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netdev_features_t sk_route_nocaps;
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int sk_gso_type;
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unsigned int sk_gso_max_size;
|
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gfp_t sk_allocation;
|
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__u32 sk_txhash;
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|
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/*
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* Because of non atomicity rules, all
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* changes are protected by socket lock.
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*/
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unsigned int __sk_flags_offset[0];
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#ifdef __BIG_ENDIAN_BITFIELD
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#define SK_FL_PROTO_SHIFT 16
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#define SK_FL_PROTO_MASK 0x00ff0000
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#define SK_FL_TYPE_SHIFT 0
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#define SK_FL_TYPE_MASK 0x0000ffff
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#else
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#define SK_FL_PROTO_SHIFT 8
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#define SK_FL_PROTO_MASK 0x0000ff00
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#define SK_FL_TYPE_SHIFT 16
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#define SK_FL_TYPE_MASK 0xffff0000
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#endif
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kmemcheck_bitfield_begin(flags);
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unsigned int sk_padding : 2,
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sk_no_check_tx : 1,
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sk_no_check_rx : 1,
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sk_userlocks : 4,
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sk_protocol : 8,
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sk_type : 16;
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#define SK_PROTOCOL_MAX U8_MAX
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kmemcheck_bitfield_end(flags);
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u16 sk_gso_max_segs;
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unsigned long sk_lingertime;
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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;
|
|
u32 sk_ack_backlog;
|
|
u32 sk_max_ack_backlog;
|
|
kuid_t sk_uid;
|
|
struct pid *sk_peer_pid;
|
|
const struct cred *sk_peer_cred;
|
|
long sk_rcvtimeo;
|
|
ktime_t sk_stamp;
|
|
u16 sk_tsflags;
|
|
u8 sk_shutdown;
|
|
u32 sk_tskey;
|
|
struct socket *sk_socket;
|
|
void *sk_user_data;
|
|
#ifdef CONFIG_SECURITY
|
|
void *sk_security;
|
|
#endif
|
|
struct sock_cgroup_data sk_cgrp_data;
|
|
struct mem_cgroup *sk_memcg;
|
|
void (*sk_state_change)(struct sock *sk);
|
|
void (*sk_data_ready)(struct sock *sk);
|
|
void (*sk_write_space)(struct sock *sk);
|
|
void (*sk_error_report)(struct sock *sk);
|
|
int (*sk_backlog_rcv)(struct sock *sk,
|
|
struct sk_buff *skb);
|
|
void (*sk_destruct)(struct sock *sk);
|
|
struct sock_reuseport __rcu *sk_reuseport_cb;
|
|
struct rcu_head sk_rcu;
|
|
};
|
|
|
|
#define __sk_user_data(sk) ((*((void __rcu **)&(sk)->sk_user_data)))
|
|
|
|
#define rcu_dereference_sk_user_data(sk) rcu_dereference(__sk_user_data((sk)))
|
|
#define rcu_assign_sk_user_data(sk, ptr) rcu_assign_pointer(__sk_user_data((sk)), ptr)
|
|
|
|
/*
|
|
* SK_CAN_REUSE and SK_NO_REUSE on a socket mean that the socket is OK
|
|
* or not whether his port will be reused by someone else. SK_FORCE_REUSE
|
|
* on a socket means that the socket will reuse everybody else's port
|
|
* without looking at the other's sk_reuse value.
|
|
*/
|
|
|
|
#define SK_NO_REUSE 0
|
|
#define SK_CAN_REUSE 1
|
|
#define SK_FORCE_REUSE 2
|
|
|
|
int sk_set_peek_off(struct sock *sk, int val);
|
|
|
|
static inline int sk_peek_offset(struct sock *sk, int flags)
|
|
{
|
|
if (unlikely(flags & MSG_PEEK)) {
|
|
s32 off = READ_ONCE(sk->sk_peek_off);
|
|
if (off >= 0)
|
|
return off;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline void sk_peek_offset_bwd(struct sock *sk, int val)
|
|
{
|
|
s32 off = READ_ONCE(sk->sk_peek_off);
|
|
|
|
if (unlikely(off >= 0)) {
|
|
off = max_t(s32, off - val, 0);
|
|
WRITE_ONCE(sk->sk_peek_off, off);
|
|
}
|
|
}
|
|
|
|
static inline void sk_peek_offset_fwd(struct sock *sk, int val)
|
|
{
|
|
sk_peek_offset_bwd(sk, -val);
|
|
}
|
|
|
|
/*
|
|
* Hashed lists helper routines
|
|
*/
|
|
static inline struct sock *sk_entry(const struct hlist_node *node)
|
|
{
|
|
return hlist_entry(node, struct sock, sk_node);
|
|
}
|
|
|
|
static inline struct sock *__sk_head(const struct hlist_head *head)
|
|
{
|
|
return hlist_entry(head->first, struct sock, sk_node);
|
|
}
|
|
|
|
static inline struct sock *sk_head(const struct hlist_head *head)
|
|
{
|
|
return hlist_empty(head) ? NULL : __sk_head(head);
|
|
}
|
|
|
|
static inline struct sock *__sk_nulls_head(const struct hlist_nulls_head *head)
|
|
{
|
|
return hlist_nulls_entry(head->first, struct sock, sk_nulls_node);
|
|
}
|
|
|
|
static inline struct sock *sk_nulls_head(const struct hlist_nulls_head *head)
|
|
{
|
|
return hlist_nulls_empty(head) ? NULL : __sk_nulls_head(head);
|
|
}
|
|
|
|
static inline struct sock *sk_next(const struct sock *sk)
|
|
{
|
|
return hlist_entry_safe(sk->sk_node.next, struct sock, sk_node);
|
|
}
|
|
|
|
static inline struct sock *sk_nulls_next(const struct sock *sk)
|
|
{
|
|
return (!is_a_nulls(sk->sk_nulls_node.next)) ?
|
|
hlist_nulls_entry(sk->sk_nulls_node.next,
|
|
struct sock, sk_nulls_node) :
|
|
NULL;
|
|
}
|
|
|
|
static inline bool sk_unhashed(const struct sock *sk)
|
|
{
|
|
return hlist_unhashed(&sk->sk_node);
|
|
}
|
|
|
|
static inline bool sk_hashed(const struct sock *sk)
|
|
{
|
|
return !sk_unhashed(sk);
|
|
}
|
|
|
|
static inline void sk_node_init(struct hlist_node *node)
|
|
{
|
|
node->pprev = NULL;
|
|
}
|
|
|
|
static inline void sk_nulls_node_init(struct hlist_nulls_node *node)
|
|
{
|
|
node->pprev = NULL;
|
|
}
|
|
|
|
static inline void __sk_del_node(struct sock *sk)
|
|
{
|
|
__hlist_del(&sk->sk_node);
|
|
}
|
|
|
|
/* NB: equivalent to hlist_del_init_rcu */
|
|
static inline bool __sk_del_node_init(struct sock *sk)
|
|
{
|
|
if (sk_hashed(sk)) {
|
|
__sk_del_node(sk);
|
|
sk_node_init(&sk->sk_node);
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/* Grab socket reference count. This operation is valid only
|
|
when sk is ALREADY grabbed f.e. it is found in hash table
|
|
or a list and the lookup is made under lock preventing hash table
|
|
modifications.
|
|
*/
|
|
|
|
static __always_inline void sock_hold(struct sock *sk)
|
|
{
|
|
atomic_inc(&sk->sk_refcnt);
|
|
}
|
|
|
|
/* Ungrab socket in the context, which assumes that socket refcnt
|
|
cannot hit zero, f.e. it is true in context of any socketcall.
|
|
*/
|
|
static __always_inline void __sock_put(struct sock *sk)
|
|
{
|
|
atomic_dec(&sk->sk_refcnt);
|
|
}
|
|
|
|
static inline bool sk_del_node_init(struct sock *sk)
|
|
{
|
|
bool rc = __sk_del_node_init(sk);
|
|
|
|
if (rc) {
|
|
/* paranoid for a while -acme */
|
|
WARN_ON(atomic_read(&sk->sk_refcnt) == 1);
|
|
__sock_put(sk);
|
|
}
|
|
return rc;
|
|
}
|
|
#define sk_del_node_init_rcu(sk) sk_del_node_init(sk)
|
|
|
|
static inline bool __sk_nulls_del_node_init_rcu(struct sock *sk)
|
|
{
|
|
if (sk_hashed(sk)) {
|
|
hlist_nulls_del_init_rcu(&sk->sk_nulls_node);
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static inline bool sk_nulls_del_node_init_rcu(struct sock *sk)
|
|
{
|
|
bool rc = __sk_nulls_del_node_init_rcu(sk);
|
|
|
|
if (rc) {
|
|
/* paranoid for a while -acme */
|
|
WARN_ON(atomic_read(&sk->sk_refcnt) == 1);
|
|
__sock_put(sk);
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
static inline void __sk_add_node(struct sock *sk, struct hlist_head *list)
|
|
{
|
|
hlist_add_head(&sk->sk_node, list);
|
|
}
|
|
|
|
static inline void sk_add_node(struct sock *sk, struct hlist_head *list)
|
|
{
|
|
sock_hold(sk);
|
|
__sk_add_node(sk, list);
|
|
}
|
|
|
|
static inline void sk_add_node_rcu(struct sock *sk, struct hlist_head *list)
|
|
{
|
|
sock_hold(sk);
|
|
if (IS_ENABLED(CONFIG_IPV6) && sk->sk_reuseport &&
|
|
sk->sk_family == AF_INET6)
|
|
hlist_add_tail_rcu(&sk->sk_node, list);
|
|
else
|
|
hlist_add_head_rcu(&sk->sk_node, list);
|
|
}
|
|
|
|
static inline void __sk_nulls_add_node_rcu(struct sock *sk, struct hlist_nulls_head *list)
|
|
{
|
|
if (IS_ENABLED(CONFIG_IPV6) && sk->sk_reuseport &&
|
|
sk->sk_family == AF_INET6)
|
|
hlist_nulls_add_tail_rcu(&sk->sk_nulls_node, list);
|
|
else
|
|
hlist_nulls_add_head_rcu(&sk->sk_nulls_node, list);
|
|
}
|
|
|
|
static inline void sk_nulls_add_node_rcu(struct sock *sk, struct hlist_nulls_head *list)
|
|
{
|
|
sock_hold(sk);
|
|
__sk_nulls_add_node_rcu(sk, list);
|
|
}
|
|
|
|
static inline void __sk_del_bind_node(struct sock *sk)
|
|
{
|
|
__hlist_del(&sk->sk_bind_node);
|
|
}
|
|
|
|
static inline void sk_add_bind_node(struct sock *sk,
|
|
struct hlist_head *list)
|
|
{
|
|
hlist_add_head(&sk->sk_bind_node, list);
|
|
}
|
|
|
|
#define sk_for_each(__sk, list) \
|
|
hlist_for_each_entry(__sk, list, sk_node)
|
|
#define sk_for_each_rcu(__sk, list) \
|
|
hlist_for_each_entry_rcu(__sk, list, sk_node)
|
|
#define sk_nulls_for_each(__sk, node, list) \
|
|
hlist_nulls_for_each_entry(__sk, node, list, sk_nulls_node)
|
|
#define sk_nulls_for_each_rcu(__sk, node, list) \
|
|
hlist_nulls_for_each_entry_rcu(__sk, node, list, sk_nulls_node)
|
|
#define sk_for_each_from(__sk) \
|
|
hlist_for_each_entry_from(__sk, sk_node)
|
|
#define sk_nulls_for_each_from(__sk, node) \
|
|
if (__sk && ({ node = &(__sk)->sk_nulls_node; 1; })) \
|
|
hlist_nulls_for_each_entry_from(__sk, node, sk_nulls_node)
|
|
#define sk_for_each_safe(__sk, tmp, list) \
|
|
hlist_for_each_entry_safe(__sk, tmp, list, sk_node)
|
|
#define sk_for_each_bound(__sk, list) \
|
|
hlist_for_each_entry(__sk, list, sk_bind_node)
|
|
|
|
/**
|
|
* sk_for_each_entry_offset_rcu - iterate over a list at a given struct offset
|
|
* @tpos: the type * to use as a loop cursor.
|
|
* @pos: the &struct hlist_node to use as a loop cursor.
|
|
* @head: the head for your list.
|
|
* @offset: offset of hlist_node within the struct.
|
|
*
|
|
*/
|
|
#define sk_for_each_entry_offset_rcu(tpos, pos, head, offset) \
|
|
for (pos = rcu_dereference((head)->first); \
|
|
pos != NULL && \
|
|
({ tpos = (typeof(*tpos) *)((void *)pos - offset); 1;}); \
|
|
pos = rcu_dereference(pos->next))
|
|
|
|
static inline struct user_namespace *sk_user_ns(struct sock *sk)
|
|
{
|
|
/* Careful only use this in a context where these parameters
|
|
* can not change and must all be valid, such as recvmsg from
|
|
* userspace.
|
|
*/
|
|
return sk->sk_socket->file->f_cred->user_ns;
|
|
}
|
|
|
|
/* Sock flags */
|
|
enum sock_flags {
|
|
SOCK_DEAD,
|
|
SOCK_DONE,
|
|
SOCK_URGINLINE,
|
|
SOCK_KEEPOPEN,
|
|
SOCK_LINGER,
|
|
SOCK_DESTROY,
|
|
SOCK_BROADCAST,
|
|
SOCK_TIMESTAMP,
|
|
SOCK_ZAPPED,
|
|
SOCK_USE_WRITE_QUEUE, /* whether to call sk->sk_write_space in sock_wfree */
|
|
SOCK_DBG, /* %SO_DEBUG setting */
|
|
SOCK_RCVTSTAMP, /* %SO_TIMESTAMP setting */
|
|
SOCK_RCVTSTAMPNS, /* %SO_TIMESTAMPNS setting */
|
|
SOCK_LOCALROUTE, /* route locally only, %SO_DONTROUTE setting */
|
|
SOCK_QUEUE_SHRUNK, /* write queue has been shrunk recently */
|
|
SOCK_MEMALLOC, /* VM depends on this socket for swapping */
|
|
SOCK_TIMESTAMPING_RX_SOFTWARE, /* %SOF_TIMESTAMPING_RX_SOFTWARE */
|
|
SOCK_FASYNC, /* fasync() active */
|
|
SOCK_RXQ_OVFL,
|
|
SOCK_ZEROCOPY, /* buffers from userspace */
|
|
SOCK_WIFI_STATUS, /* push wifi status to userspace */
|
|
SOCK_NOFCS, /* Tell NIC not to do the Ethernet FCS.
|
|
* Will use last 4 bytes of packet sent from
|
|
* user-space instead.
|
|
*/
|
|
SOCK_FILTER_LOCKED, /* Filter cannot be changed anymore */
|
|
SOCK_SELECT_ERR_QUEUE, /* Wake select on error queue */
|
|
SOCK_RCU_FREE, /* wait rcu grace period in sk_destruct() */
|
|
};
|
|
|
|
#define SK_FLAGS_TIMESTAMP ((1UL << SOCK_TIMESTAMP) | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE))
|
|
|
|
static inline void sock_copy_flags(struct sock *nsk, struct sock *osk)
|
|
{
|
|
nsk->sk_flags = osk->sk_flags;
|
|
}
|
|
|
|
static inline void sock_set_flag(struct sock *sk, enum sock_flags flag)
|
|
{
|
|
__set_bit(flag, &sk->sk_flags);
|
|
}
|
|
|
|
static inline void sock_reset_flag(struct sock *sk, enum sock_flags flag)
|
|
{
|
|
__clear_bit(flag, &sk->sk_flags);
|
|
}
|
|
|
|
static inline bool sock_flag(const struct sock *sk, enum sock_flags flag)
|
|
{
|
|
return test_bit(flag, &sk->sk_flags);
|
|
}
|
|
|
|
#ifdef CONFIG_NET
|
|
extern struct static_key memalloc_socks;
|
|
static inline int sk_memalloc_socks(void)
|
|
{
|
|
return static_key_false(&memalloc_socks);
|
|
}
|
|
#else
|
|
|
|
static inline int sk_memalloc_socks(void)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
#endif
|
|
|
|
static inline gfp_t sk_gfp_mask(const struct sock *sk, gfp_t gfp_mask)
|
|
{
|
|
return gfp_mask | (sk->sk_allocation & __GFP_MEMALLOC);
|
|
}
|
|
|
|
static inline void sk_acceptq_removed(struct sock *sk)
|
|
{
|
|
sk->sk_ack_backlog--;
|
|
}
|
|
|
|
static inline void sk_acceptq_added(struct sock *sk)
|
|
{
|
|
sk->sk_ack_backlog++;
|
|
}
|
|
|
|
static inline bool sk_acceptq_is_full(const struct sock *sk)
|
|
{
|
|
return sk->sk_ack_backlog > sk->sk_max_ack_backlog;
|
|
}
|
|
|
|
/*
|
|
* Compute minimal free write space needed to queue new packets.
|
|
*/
|
|
static inline int sk_stream_min_wspace(const struct sock *sk)
|
|
{
|
|
return sk->sk_wmem_queued >> 1;
|
|
}
|
|
|
|
static inline int sk_stream_wspace(const struct sock *sk)
|
|
{
|
|
return sk->sk_sndbuf - sk->sk_wmem_queued;
|
|
}
|
|
|
|
void sk_stream_write_space(struct sock *sk);
|
|
|
|
/* OOB backlog add */
|
|
static inline void __sk_add_backlog(struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
/* dont let skb dst not refcounted, we are going to leave rcu lock */
|
|
skb_dst_force_safe(skb);
|
|
|
|
if (!sk->sk_backlog.tail)
|
|
sk->sk_backlog.head = skb;
|
|
else
|
|
sk->sk_backlog.tail->next = skb;
|
|
|
|
sk->sk_backlog.tail = skb;
|
|
skb->next = NULL;
|
|
}
|
|
|
|
/*
|
|
* Take into account size of receive queue and backlog queue
|
|
* Do not take into account this skb truesize,
|
|
* to allow even a single big packet to come.
|
|
*/
|
|
static inline bool sk_rcvqueues_full(const struct sock *sk, unsigned int limit)
|
|
{
|
|
unsigned int qsize = sk->sk_backlog.len + atomic_read(&sk->sk_rmem_alloc);
|
|
|
|
return qsize > limit;
|
|
}
|
|
|
|
/* The per-socket spinlock must be held here. */
|
|
static inline __must_check int sk_add_backlog(struct sock *sk, struct sk_buff *skb,
|
|
unsigned int limit)
|
|
{
|
|
if (sk_rcvqueues_full(sk, limit))
|
|
return -ENOBUFS;
|
|
|
|
/*
|
|
* If the skb was allocated from pfmemalloc reserves, only
|
|
* allow SOCK_MEMALLOC sockets to use it as this socket is
|
|
* helping free memory
|
|
*/
|
|
if (skb_pfmemalloc(skb) && !sock_flag(sk, SOCK_MEMALLOC))
|
|
return -ENOMEM;
|
|
|
|
__sk_add_backlog(sk, skb);
|
|
sk->sk_backlog.len += skb->truesize;
|
|
return 0;
|
|
}
|
|
|
|
int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb);
|
|
|
|
static inline int sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
if (sk_memalloc_socks() && skb_pfmemalloc(skb))
|
|
return __sk_backlog_rcv(sk, skb);
|
|
|
|
return sk->sk_backlog_rcv(sk, skb);
|
|
}
|
|
|
|
static inline void sk_incoming_cpu_update(struct sock *sk)
|
|
{
|
|
sk->sk_incoming_cpu = raw_smp_processor_id();
|
|
}
|
|
|
|
static inline void sock_rps_record_flow_hash(__u32 hash)
|
|
{
|
|
#ifdef CONFIG_RPS
|
|
struct rps_sock_flow_table *sock_flow_table;
|
|
|
|
rcu_read_lock();
|
|
sock_flow_table = rcu_dereference(rps_sock_flow_table);
|
|
rps_record_sock_flow(sock_flow_table, hash);
|
|
rcu_read_unlock();
|
|
#endif
|
|
}
|
|
|
|
static inline void sock_rps_record_flow(const struct sock *sk)
|
|
{
|
|
#ifdef CONFIG_RPS
|
|
if (static_key_false(&rfs_needed)) {
|
|
/* Reading sk->sk_rxhash might incur an expensive cache line
|
|
* miss.
|
|
*
|
|
* TCP_ESTABLISHED does cover almost all states where RFS
|
|
* might be useful, and is cheaper [1] than testing :
|
|
* IPv4: inet_sk(sk)->inet_daddr
|
|
* IPv6: ipv6_addr_any(&sk->sk_v6_daddr)
|
|
* OR an additional socket flag
|
|
* [1] : sk_state and sk_prot are in the same cache line.
|
|
*/
|
|
if (sk->sk_state == TCP_ESTABLISHED)
|
|
sock_rps_record_flow_hash(sk->sk_rxhash);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
static inline void sock_rps_save_rxhash(struct sock *sk,
|
|
const struct sk_buff *skb)
|
|
{
|
|
#ifdef CONFIG_RPS
|
|
if (unlikely(sk->sk_rxhash != skb->hash))
|
|
sk->sk_rxhash = skb->hash;
|
|
#endif
|
|
}
|
|
|
|
static inline void sock_rps_reset_rxhash(struct sock *sk)
|
|
{
|
|
#ifdef CONFIG_RPS
|
|
sk->sk_rxhash = 0;
|
|
#endif
|
|
}
|
|
|
|
#define sk_wait_event(__sk, __timeo, __condition, __wait) \
|
|
({ int __rc; \
|
|
release_sock(__sk); \
|
|
__rc = __condition; \
|
|
if (!__rc) { \
|
|
*(__timeo) = wait_woken(__wait, \
|
|
TASK_INTERRUPTIBLE, \
|
|
*(__timeo)); \
|
|
} \
|
|
sched_annotate_sleep(); \
|
|
lock_sock(__sk); \
|
|
__rc = __condition; \
|
|
__rc; \
|
|
})
|
|
|
|
int sk_stream_wait_connect(struct sock *sk, long *timeo_p);
|
|
int sk_stream_wait_memory(struct sock *sk, long *timeo_p);
|
|
void sk_stream_wait_close(struct sock *sk, long timeo_p);
|
|
int sk_stream_error(struct sock *sk, int flags, int err);
|
|
void sk_stream_kill_queues(struct sock *sk);
|
|
void sk_set_memalloc(struct sock *sk);
|
|
void sk_clear_memalloc(struct sock *sk);
|
|
|
|
void __sk_flush_backlog(struct sock *sk);
|
|
|
|
static inline bool sk_flush_backlog(struct sock *sk)
|
|
{
|
|
if (unlikely(READ_ONCE(sk->sk_backlog.tail))) {
|
|
__sk_flush_backlog(sk);
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
int sk_wait_data(struct sock *sk, long *timeo, const struct sk_buff *skb);
|
|
|
|
struct request_sock_ops;
|
|
struct timewait_sock_ops;
|
|
struct inet_hashinfo;
|
|
struct raw_hashinfo;
|
|
struct smc_hashinfo;
|
|
struct module;
|
|
|
|
/*
|
|
* caches using SLAB_DESTROY_BY_RCU should let .next pointer from nulls nodes
|
|
* un-modified. Special care is taken when initializing object to zero.
|
|
*/
|
|
static inline void sk_prot_clear_nulls(struct sock *sk, int size)
|
|
{
|
|
if (offsetof(struct sock, sk_node.next) != 0)
|
|
memset(sk, 0, offsetof(struct sock, sk_node.next));
|
|
memset(&sk->sk_node.pprev, 0,
|
|
size - offsetof(struct sock, sk_node.pprev));
|
|
}
|
|
|
|
/* Networking protocol blocks we attach to sockets.
|
|
* socket layer -> transport layer interface
|
|
*/
|
|
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);
|
|
void (*destroy)(struct sock *sk);
|
|
void (*shutdown)(struct sock *sk, int how);
|
|
int (*setsockopt)(struct sock *sk, int level,
|
|
int optname, char __user *optval,
|
|
unsigned int optlen);
|
|
int (*getsockopt)(struct sock *sk, int level,
|
|
int optname, char __user *optval,
|
|
int __user *option);
|
|
void (*keepalive)(struct sock *sk, int valbool);
|
|
#ifdef CONFIG_COMPAT
|
|
int (*compat_setsockopt)(struct sock *sk,
|
|
int level,
|
|
int optname, char __user *optval,
|
|
unsigned int optlen);
|
|
int (*compat_getsockopt)(struct sock *sk,
|
|
int level,
|
|
int optname, char __user *optval,
|
|
int __user *option);
|
|
int (*compat_ioctl)(struct sock *sk,
|
|
unsigned int cmd, unsigned long arg);
|
|
#endif
|
|
int (*sendmsg)(struct sock *sk, struct msghdr *msg,
|
|
size_t len);
|
|
int (*recvmsg)(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);
|
|
|
|
void (*release_cb)(struct sock *sk);
|
|
|
|
/* Keeping track of sk's, looking them up, and port selection methods. */
|
|
int (*hash)(struct sock *sk);
|
|
void (*unhash)(struct sock *sk);
|
|
void (*rehash)(struct sock *sk);
|
|
int (*get_port)(struct sock *sk, unsigned short snum);
|
|
|
|
/* Keeping track of sockets in use */
|
|
#ifdef CONFIG_PROC_FS
|
|
unsigned int inuse_idx;
|
|
#endif
|
|
|
|
bool (*stream_memory_free)(const struct sock *sk);
|
|
/* Memory pressure */
|
|
void (*enter_memory_pressure)(struct sock *sk);
|
|
atomic_long_t *memory_allocated; /* Current allocated memory. */
|
|
struct percpu_counter *sockets_allocated; /* Current number of sockets. */
|
|
/*
|
|
* Pressure flag: try to collapse.
|
|
* Technical note: it is used by multiple contexts non atomically.
|
|
* All the __sk_mem_schedule() is of this nature: accounting
|
|
* is strict, actions are advisory and have some latency.
|
|
*/
|
|
int *memory_pressure;
|
|
long *sysctl_mem;
|
|
int *sysctl_wmem;
|
|
int *sysctl_rmem;
|
|
int max_header;
|
|
bool no_autobind;
|
|
|
|
struct kmem_cache *slab;
|
|
unsigned int obj_size;
|
|
int slab_flags;
|
|
|
|
struct percpu_counter *orphan_count;
|
|
|
|
struct request_sock_ops *rsk_prot;
|
|
struct timewait_sock_ops *twsk_prot;
|
|
|
|
union {
|
|
struct inet_hashinfo *hashinfo;
|
|
struct udp_table *udp_table;
|
|
struct raw_hashinfo *raw_hash;
|
|
struct smc_hashinfo *smc_hash;
|
|
} h;
|
|
|
|
struct module *owner;
|
|
|
|
char name[32];
|
|
|
|
struct list_head node;
|
|
#ifdef SOCK_REFCNT_DEBUG
|
|
atomic_t socks;
|
|
#endif
|
|
int (*diag_destroy)(struct sock *sk, int err);
|
|
};
|
|
|
|
int proto_register(struct proto *prot, int alloc_slab);
|
|
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 */
|
|
|
|
static inline bool sk_stream_memory_free(const struct sock *sk)
|
|
{
|
|
if (sk->sk_wmem_queued >= sk->sk_sndbuf)
|
|
return false;
|
|
|
|
return sk->sk_prot->stream_memory_free ?
|
|
sk->sk_prot->stream_memory_free(sk) : true;
|
|
}
|
|
|
|
static inline bool sk_stream_is_writeable(const struct sock *sk)
|
|
{
|
|
return sk_stream_wspace(sk) >= sk_stream_min_wspace(sk) &&
|
|
sk_stream_memory_free(sk);
|
|
}
|
|
|
|
static inline int sk_under_cgroup_hierarchy(struct sock *sk,
|
|
struct cgroup *ancestor)
|
|
{
|
|
#ifdef CONFIG_SOCK_CGROUP_DATA
|
|
return cgroup_is_descendant(sock_cgroup_ptr(&sk->sk_cgrp_data),
|
|
ancestor);
|
|
#else
|
|
return -ENOTSUPP;
|
|
#endif
|
|
}
|
|
|
|
static inline bool sk_has_memory_pressure(const struct sock *sk)
|
|
{
|
|
return sk->sk_prot->memory_pressure != NULL;
|
|
}
|
|
|
|
static inline bool sk_under_memory_pressure(const struct sock *sk)
|
|
{
|
|
if (!sk->sk_prot->memory_pressure)
|
|
return false;
|
|
|
|
if (mem_cgroup_sockets_enabled && sk->sk_memcg &&
|
|
mem_cgroup_under_socket_pressure(sk->sk_memcg))
|
|
return true;
|
|
|
|
return !!*sk->sk_prot->memory_pressure;
|
|
}
|
|
|
|
static inline void sk_leave_memory_pressure(struct sock *sk)
|
|
{
|
|
int *memory_pressure = sk->sk_prot->memory_pressure;
|
|
|
|
if (!memory_pressure)
|
|
return;
|
|
|
|
if (*memory_pressure)
|
|
*memory_pressure = 0;
|
|
}
|
|
|
|
static inline void sk_enter_memory_pressure(struct sock *sk)
|
|
{
|
|
if (!sk->sk_prot->enter_memory_pressure)
|
|
return;
|
|
|
|
sk->sk_prot->enter_memory_pressure(sk);
|
|
}
|
|
|
|
static inline long
|
|
sk_memory_allocated(const struct sock *sk)
|
|
{
|
|
return atomic_long_read(sk->sk_prot->memory_allocated);
|
|
}
|
|
|
|
static inline long
|
|
sk_memory_allocated_add(struct sock *sk, int amt)
|
|
{
|
|
return atomic_long_add_return(amt, sk->sk_prot->memory_allocated);
|
|
}
|
|
|
|
static inline void
|
|
sk_memory_allocated_sub(struct sock *sk, int amt)
|
|
{
|
|
atomic_long_sub(amt, sk->sk_prot->memory_allocated);
|
|
}
|
|
|
|
static inline void sk_sockets_allocated_dec(struct sock *sk)
|
|
{
|
|
percpu_counter_dec(sk->sk_prot->sockets_allocated);
|
|
}
|
|
|
|
static inline void sk_sockets_allocated_inc(struct sock *sk)
|
|
{
|
|
percpu_counter_inc(sk->sk_prot->sockets_allocated);
|
|
}
|
|
|
|
static inline int
|
|
sk_sockets_allocated_read_positive(struct sock *sk)
|
|
{
|
|
return percpu_counter_read_positive(sk->sk_prot->sockets_allocated);
|
|
}
|
|
|
|
static inline int
|
|
proto_sockets_allocated_sum_positive(struct proto *prot)
|
|
{
|
|
return percpu_counter_sum_positive(prot->sockets_allocated);
|
|
}
|
|
|
|
static inline long
|
|
proto_memory_allocated(struct proto *prot)
|
|
{
|
|
return atomic_long_read(prot->memory_allocated);
|
|
}
|
|
|
|
static inline bool
|
|
proto_memory_pressure(struct proto *prot)
|
|
{
|
|
if (!prot->memory_pressure)
|
|
return false;
|
|
return !!*prot->memory_pressure;
|
|
}
|
|
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
/* Called with local bh disabled */
|
|
void sock_prot_inuse_add(struct net *net, struct proto *prot, int inc);
|
|
int sock_prot_inuse_get(struct net *net, struct proto *proto);
|
|
#else
|
|
static inline void sock_prot_inuse_add(struct net *net, struct proto *prot,
|
|
int inc)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
|
|
/* With per-bucket locks this operation is not-atomic, so that
|
|
* this version is not worse.
|
|
*/
|
|
static inline int __sk_prot_rehash(struct sock *sk)
|
|
{
|
|
sk->sk_prot->unhash(sk);
|
|
return 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
|
|
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* Functions for memory accounting
|
|
*/
|
|
int __sk_mem_raise_allocated(struct sock *sk, int size, int amt, int kind);
|
|
int __sk_mem_schedule(struct sock *sk, int size, int kind);
|
|
void __sk_mem_reduce_allocated(struct sock *sk, int amount);
|
|
void __sk_mem_reclaim(struct sock *sk, int amount);
|
|
|
|
/* We used to have PAGE_SIZE here, but systems with 64KB pages
|
|
* do not necessarily have 16x time more memory than 4KB ones.
|
|
*/
|
|
#define SK_MEM_QUANTUM 4096
|
|
#define SK_MEM_QUANTUM_SHIFT ilog2(SK_MEM_QUANTUM)
|
|
#define SK_MEM_SEND 0
|
|
#define SK_MEM_RECV 1
|
|
|
|
/* sysctl_mem values are in pages, we convert them in SK_MEM_QUANTUM units */
|
|
static inline long sk_prot_mem_limits(const struct sock *sk, int index)
|
|
{
|
|
long val = sk->sk_prot->sysctl_mem[index];
|
|
|
|
#if PAGE_SIZE > SK_MEM_QUANTUM
|
|
val <<= PAGE_SHIFT - SK_MEM_QUANTUM_SHIFT;
|
|
#elif PAGE_SIZE < SK_MEM_QUANTUM
|
|
val >>= SK_MEM_QUANTUM_SHIFT - PAGE_SHIFT;
|
|
#endif
|
|
return val;
|
|
}
|
|
|
|
static inline int sk_mem_pages(int amt)
|
|
{
|
|
return (amt + SK_MEM_QUANTUM - 1) >> SK_MEM_QUANTUM_SHIFT;
|
|
}
|
|
|
|
static inline bool sk_has_account(struct sock *sk)
|
|
{
|
|
/* return true if protocol supports memory accounting */
|
|
return !!sk->sk_prot->memory_allocated;
|
|
}
|
|
|
|
static inline bool sk_wmem_schedule(struct sock *sk, int size)
|
|
{
|
|
if (!sk_has_account(sk))
|
|
return true;
|
|
return size <= sk->sk_forward_alloc ||
|
|
__sk_mem_schedule(sk, size, SK_MEM_SEND);
|
|
}
|
|
|
|
static inline bool
|
|
sk_rmem_schedule(struct sock *sk, struct sk_buff *skb, int size)
|
|
{
|
|
if (!sk_has_account(sk))
|
|
return true;
|
|
return size<= sk->sk_forward_alloc ||
|
|
__sk_mem_schedule(sk, size, SK_MEM_RECV) ||
|
|
skb_pfmemalloc(skb);
|
|
}
|
|
|
|
static inline void sk_mem_reclaim(struct sock *sk)
|
|
{
|
|
if (!sk_has_account(sk))
|
|
return;
|
|
if (sk->sk_forward_alloc >= SK_MEM_QUANTUM)
|
|
__sk_mem_reclaim(sk, sk->sk_forward_alloc);
|
|
}
|
|
|
|
static inline void sk_mem_reclaim_partial(struct sock *sk)
|
|
{
|
|
if (!sk_has_account(sk))
|
|
return;
|
|
if (sk->sk_forward_alloc > SK_MEM_QUANTUM)
|
|
__sk_mem_reclaim(sk, sk->sk_forward_alloc - 1);
|
|
}
|
|
|
|
static inline void sk_mem_charge(struct sock *sk, int size)
|
|
{
|
|
if (!sk_has_account(sk))
|
|
return;
|
|
sk->sk_forward_alloc -= size;
|
|
}
|
|
|
|
static inline void sk_mem_uncharge(struct sock *sk, int size)
|
|
{
|
|
if (!sk_has_account(sk))
|
|
return;
|
|
sk->sk_forward_alloc += size;
|
|
|
|
/* Avoid a possible overflow.
|
|
* TCP send queues can make this happen, if sk_mem_reclaim()
|
|
* is not called and more than 2 GBytes are released at once.
|
|
*
|
|
* If we reach 2 MBytes, reclaim 1 MBytes right now, there is
|
|
* no need to hold that much forward allocation anyway.
|
|
*/
|
|
if (unlikely(sk->sk_forward_alloc >= 1 << 21))
|
|
__sk_mem_reclaim(sk, 1 << 20);
|
|
}
|
|
|
|
static inline void sk_wmem_free_skb(struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
sock_set_flag(sk, SOCK_QUEUE_SHRUNK);
|
|
sk->sk_wmem_queued -= skb->truesize;
|
|
sk_mem_uncharge(sk, skb->truesize);
|
|
__kfree_skb(skb);
|
|
}
|
|
|
|
static inline void sock_release_ownership(struct sock *sk)
|
|
{
|
|
if (sk->sk_lock.owned) {
|
|
sk->sk_lock.owned = 0;
|
|
|
|
/* The sk_lock has mutex_unlock() semantics: */
|
|
mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
|
|
#ifdef CONFIG_LOCKDEP
|
|
static inline bool lockdep_sock_is_held(const struct sock *csk)
|
|
{
|
|
struct sock *sk = (struct sock *)csk;
|
|
|
|
return lockdep_is_held(&sk->sk_lock) ||
|
|
lockdep_is_held(&sk->sk_lock.slock);
|
|
}
|
|
#endif
|
|
|
|
void lock_sock_nested(struct sock *sk, int subclass);
|
|
|
|
static inline void lock_sock(struct sock *sk)
|
|
{
|
|
lock_sock_nested(sk, 0);
|
|
}
|
|
|
|
void 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))
|
|
|
|
bool lock_sock_fast(struct sock *sk);
|
|
/**
|
|
* unlock_sock_fast - complement of lock_sock_fast
|
|
* @sk: socket
|
|
* @slow: slow mode
|
|
*
|
|
* fast unlock socket for user context.
|
|
* If slow mode is on, we call regular release_sock()
|
|
*/
|
|
static inline void unlock_sock_fast(struct sock *sk, bool slow)
|
|
{
|
|
if (slow)
|
|
release_sock(sk);
|
|
else
|
|
spin_unlock_bh(&sk->sk_lock.slock);
|
|
}
|
|
|
|
/* 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.
|
|
*/
|
|
|
|
static inline void sock_owned_by_me(const struct sock *sk)
|
|
{
|
|
#ifdef CONFIG_LOCKDEP
|
|
WARN_ON_ONCE(!lockdep_sock_is_held(sk) && debug_locks);
|
|
#endif
|
|
}
|
|
|
|
static inline bool sock_owned_by_user(const struct sock *sk)
|
|
{
|
|
sock_owned_by_me(sk);
|
|
return sk->sk_lock.owned;
|
|
}
|
|
|
|
/* no reclassification while locks are held */
|
|
static inline bool sock_allow_reclassification(const struct sock *csk)
|
|
{
|
|
struct sock *sk = (struct sock *)csk;
|
|
|
|
return !sk->sk_lock.owned && !spin_is_locked(&sk->sk_lock.slock);
|
|
}
|
|
|
|
struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
|
|
struct proto *prot, int kern);
|
|
void sk_free(struct sock *sk);
|
|
void sk_destruct(struct sock *sk);
|
|
struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority);
|
|
|
|
struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
|
|
gfp_t priority);
|
|
void __sock_wfree(struct sk_buff *skb);
|
|
void sock_wfree(struct sk_buff *skb);
|
|
void skb_orphan_partial(struct sk_buff *skb);
|
|
void sock_rfree(struct sk_buff *skb);
|
|
void sock_efree(struct sk_buff *skb);
|
|
#ifdef CONFIG_INET
|
|
void sock_edemux(struct sk_buff *skb);
|
|
#else
|
|
#define sock_edemux(skb) sock_efree(skb)
|
|
#endif
|
|
|
|
int sock_setsockopt(struct socket *sock, int level, int op,
|
|
char __user *optval, unsigned int optlen);
|
|
|
|
int sock_getsockopt(struct socket *sock, int level, int op,
|
|
char __user *optval, int __user *optlen);
|
|
struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
|
|
int noblock, int *errcode);
|
|
struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
|
|
unsigned long data_len, int noblock,
|
|
int *errcode, int max_page_order);
|
|
void *sock_kmalloc(struct sock *sk, int size, gfp_t priority);
|
|
void sock_kfree_s(struct sock *sk, void *mem, int size);
|
|
void sock_kzfree_s(struct sock *sk, void *mem, int size);
|
|
void sk_send_sigurg(struct sock *sk);
|
|
|
|
struct sockcm_cookie {
|
|
u32 mark;
|
|
u16 tsflags;
|
|
};
|
|
|
|
int __sock_cmsg_send(struct sock *sk, struct msghdr *msg, struct cmsghdr *cmsg,
|
|
struct sockcm_cookie *sockc);
|
|
int sock_cmsg_send(struct sock *sk, struct msghdr *msg,
|
|
struct sockcm_cookie *sockc);
|
|
|
|
/*
|
|
* Functions to fill in entries in struct proto_ops when a protocol
|
|
* does not implement a particular function.
|
|
*/
|
|
int sock_no_bind(struct socket *, struct sockaddr *, int);
|
|
int sock_no_connect(struct socket *, struct sockaddr *, int, int);
|
|
int sock_no_socketpair(struct socket *, struct socket *);
|
|
int sock_no_accept(struct socket *, struct socket *, int);
|
|
int sock_no_getname(struct socket *, struct sockaddr *, int *, int);
|
|
unsigned int sock_no_poll(struct file *, struct socket *,
|
|
struct poll_table_struct *);
|
|
int sock_no_ioctl(struct socket *, unsigned int, unsigned long);
|
|
int sock_no_listen(struct socket *, int);
|
|
int sock_no_shutdown(struct socket *, int);
|
|
int sock_no_getsockopt(struct socket *, int , int, char __user *, int __user *);
|
|
int sock_no_setsockopt(struct socket *, int, int, char __user *, unsigned int);
|
|
int sock_no_sendmsg(struct socket *, struct msghdr *, size_t);
|
|
int sock_no_recvmsg(struct socket *, struct msghdr *, size_t, int);
|
|
int sock_no_mmap(struct file *file, struct socket *sock,
|
|
struct vm_area_struct *vma);
|
|
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.
|
|
*/
|
|
int sock_common_getsockopt(struct socket *sock, int level, int optname,
|
|
char __user *optval, int __user *optlen);
|
|
int sock_common_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
|
|
int flags);
|
|
int sock_common_setsockopt(struct socket *sock, int level, int optname,
|
|
char __user *optval, unsigned int optlen);
|
|
int compat_sock_common_getsockopt(struct socket *sock, int level,
|
|
int optname, char __user *optval, int __user *optlen);
|
|
int compat_sock_common_setsockopt(struct socket *sock, int level,
|
|
int optname, char __user *optval, unsigned int optlen);
|
|
|
|
void sk_common_release(struct sock *sk);
|
|
|
|
/*
|
|
* Default socket callbacks and setup code
|
|
*/
|
|
|
|
/* Initialise core socket variables */
|
|
void sock_init_data(struct socket *sock, struct sock *sk);
|
|
|
|
/*
|
|
* 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);
|
|
}
|
|
/* Generic version of sock_put(), dealing with all sockets
|
|
* (TCP_TIMEWAIT, TCP_NEW_SYN_RECV, ESTABLISHED...)
|
|
*/
|
|
void sock_gen_put(struct sock *sk);
|
|
|
|
int __sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested,
|
|
unsigned int trim_cap, bool refcounted);
|
|
static inline int sk_receive_skb(struct sock *sk, struct sk_buff *skb,
|
|
const int nested)
|
|
{
|
|
return __sk_receive_skb(sk, skb, nested, 1, true);
|
|
}
|
|
|
|
static inline void sk_tx_queue_set(struct sock *sk, int tx_queue)
|
|
{
|
|
sk->sk_tx_queue_mapping = tx_queue;
|
|
}
|
|
|
|
static inline void sk_tx_queue_clear(struct sock *sk)
|
|
{
|
|
sk->sk_tx_queue_mapping = -1;
|
|
}
|
|
|
|
static inline int sk_tx_queue_get(const struct sock *sk)
|
|
{
|
|
return sk ? sk->sk_tx_queue_mapping : -1;
|
|
}
|
|
|
|
static inline void sk_set_socket(struct sock *sk, struct socket *sock)
|
|
{
|
|
sk_tx_queue_clear(sk);
|
|
sk->sk_socket = sock;
|
|
}
|
|
|
|
static inline wait_queue_head_t *sk_sleep(struct sock *sk)
|
|
{
|
|
BUILD_BUG_ON(offsetof(struct socket_wq, wait) != 0);
|
|
return &rcu_dereference_raw(sk->sk_wq)->wait;
|
|
}
|
|
/* 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_set_socket(sk, NULL);
|
|
sk->sk_wq = 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_wq = parent->wq;
|
|
parent->sk = sk;
|
|
sk_set_socket(sk, parent);
|
|
sk->sk_uid = SOCK_INODE(parent)->i_uid;
|
|
security_sock_graft(sk, parent);
|
|
write_unlock_bh(&sk->sk_callback_lock);
|
|
}
|
|
|
|
kuid_t sock_i_uid(struct sock *sk);
|
|
unsigned long sock_i_ino(struct sock *sk);
|
|
|
|
static inline kuid_t sock_net_uid(const struct net *net, const struct sock *sk)
|
|
{
|
|
return sk ? sk->sk_uid : make_kuid(net->user_ns, 0);
|
|
}
|
|
|
|
static inline u32 net_tx_rndhash(void)
|
|
{
|
|
u32 v = prandom_u32();
|
|
|
|
return v ?: 1;
|
|
}
|
|
|
|
static inline void sk_set_txhash(struct sock *sk)
|
|
{
|
|
sk->sk_txhash = net_tx_rndhash();
|
|
}
|
|
|
|
static inline void sk_rethink_txhash(struct sock *sk)
|
|
{
|
|
if (sk->sk_txhash)
|
|
sk_set_txhash(sk);
|
|
}
|
|
|
|
static inline struct dst_entry *
|
|
__sk_dst_get(struct sock *sk)
|
|
{
|
|
return rcu_dereference_check(sk->sk_dst_cache,
|
|
lockdep_sock_is_held(sk));
|
|
}
|
|
|
|
static inline struct dst_entry *
|
|
sk_dst_get(struct sock *sk)
|
|
{
|
|
struct dst_entry *dst;
|
|
|
|
rcu_read_lock();
|
|
dst = rcu_dereference(sk->sk_dst_cache);
|
|
if (dst && !atomic_inc_not_zero(&dst->__refcnt))
|
|
dst = NULL;
|
|
rcu_read_unlock();
|
|
return dst;
|
|
}
|
|
|
|
static inline void dst_negative_advice(struct sock *sk)
|
|
{
|
|
struct dst_entry *ndst, *dst = __sk_dst_get(sk);
|
|
|
|
sk_rethink_txhash(sk);
|
|
|
|
if (dst && dst->ops->negative_advice) {
|
|
ndst = dst->ops->negative_advice(dst);
|
|
|
|
if (ndst != dst) {
|
|
rcu_assign_pointer(sk->sk_dst_cache, ndst);
|
|
sk_tx_queue_clear(sk);
|
|
}
|
|
}
|
|
}
|
|
|
|
static inline void
|
|
__sk_dst_set(struct sock *sk, struct dst_entry *dst)
|
|
{
|
|
struct dst_entry *old_dst;
|
|
|
|
sk_tx_queue_clear(sk);
|
|
/*
|
|
* This can be called while sk is owned by the caller only,
|
|
* with no state that can be checked in a rcu_dereference_check() cond
|
|
*/
|
|
old_dst = rcu_dereference_raw(sk->sk_dst_cache);
|
|
rcu_assign_pointer(sk->sk_dst_cache, dst);
|
|
dst_release(old_dst);
|
|
}
|
|
|
|
static inline void
|
|
sk_dst_set(struct sock *sk, struct dst_entry *dst)
|
|
{
|
|
struct dst_entry *old_dst;
|
|
|
|
sk_tx_queue_clear(sk);
|
|
old_dst = xchg((__force struct dst_entry **)&sk->sk_dst_cache, dst);
|
|
dst_release(old_dst);
|
|
}
|
|
|
|
static inline void
|
|
__sk_dst_reset(struct sock *sk)
|
|
{
|
|
__sk_dst_set(sk, NULL);
|
|
}
|
|
|
|
static inline void
|
|
sk_dst_reset(struct sock *sk)
|
|
{
|
|
sk_dst_set(sk, NULL);
|
|
}
|
|
|
|
struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie);
|
|
|
|
struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie);
|
|
|
|
bool sk_mc_loop(struct sock *sk);
|
|
|
|
static inline bool sk_can_gso(const struct sock *sk)
|
|
{
|
|
return net_gso_ok(sk->sk_route_caps, sk->sk_gso_type);
|
|
}
|
|
|
|
void sk_setup_caps(struct sock *sk, struct dst_entry *dst);
|
|
|
|
static inline void sk_nocaps_add(struct sock *sk, netdev_features_t flags)
|
|
{
|
|
sk->sk_route_nocaps |= flags;
|
|
sk->sk_route_caps &= ~flags;
|
|
}
|
|
|
|
static inline bool sk_check_csum_caps(struct sock *sk)
|
|
{
|
|
return (sk->sk_route_caps & NETIF_F_HW_CSUM) ||
|
|
(sk->sk_family == PF_INET &&
|
|
(sk->sk_route_caps & NETIF_F_IP_CSUM)) ||
|
|
(sk->sk_family == PF_INET6 &&
|
|
(sk->sk_route_caps & NETIF_F_IPV6_CSUM));
|
|
}
|
|
|
|
static inline int skb_do_copy_data_nocache(struct sock *sk, struct sk_buff *skb,
|
|
struct iov_iter *from, char *to,
|
|
int copy, int offset)
|
|
{
|
|
if (skb->ip_summed == CHECKSUM_NONE) {
|
|
__wsum csum = 0;
|
|
if (!csum_and_copy_from_iter_full(to, copy, &csum, from))
|
|
return -EFAULT;
|
|
skb->csum = csum_block_add(skb->csum, csum, offset);
|
|
} else if (sk->sk_route_caps & NETIF_F_NOCACHE_COPY) {
|
|
if (!copy_from_iter_full_nocache(to, copy, from))
|
|
return -EFAULT;
|
|
} else if (!copy_from_iter_full(to, copy, from))
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline int skb_add_data_nocache(struct sock *sk, struct sk_buff *skb,
|
|
struct iov_iter *from, int copy)
|
|
{
|
|
int err, offset = skb->len;
|
|
|
|
err = skb_do_copy_data_nocache(sk, skb, from, skb_put(skb, copy),
|
|
copy, offset);
|
|
if (err)
|
|
__skb_trim(skb, offset);
|
|
|
|
return err;
|
|
}
|
|
|
|
static inline int skb_copy_to_page_nocache(struct sock *sk, struct iov_iter *from,
|
|
struct sk_buff *skb,
|
|
struct page *page,
|
|
int off, int copy)
|
|
{
|
|
int err;
|
|
|
|
err = skb_do_copy_data_nocache(sk, skb, from, page_address(page) + off,
|
|
copy, skb->len);
|
|
if (err)
|
|
return err;
|
|
|
|
skb->len += copy;
|
|
skb->data_len += copy;
|
|
skb->truesize += copy;
|
|
sk->sk_wmem_queued += copy;
|
|
sk_mem_charge(sk, copy);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* sk_wmem_alloc_get - returns write allocations
|
|
* @sk: socket
|
|
*
|
|
* Returns sk_wmem_alloc minus initial offset of one
|
|
*/
|
|
static inline int sk_wmem_alloc_get(const struct sock *sk)
|
|
{
|
|
return atomic_read(&sk->sk_wmem_alloc) - 1;
|
|
}
|
|
|
|
/**
|
|
* sk_rmem_alloc_get - returns read allocations
|
|
* @sk: socket
|
|
*
|
|
* Returns sk_rmem_alloc
|
|
*/
|
|
static inline int sk_rmem_alloc_get(const struct sock *sk)
|
|
{
|
|
return atomic_read(&sk->sk_rmem_alloc);
|
|
}
|
|
|
|
/**
|
|
* sk_has_allocations - check if allocations are outstanding
|
|
* @sk: socket
|
|
*
|
|
* Returns true if socket has write or read allocations
|
|
*/
|
|
static inline bool sk_has_allocations(const struct sock *sk)
|
|
{
|
|
return sk_wmem_alloc_get(sk) || sk_rmem_alloc_get(sk);
|
|
}
|
|
|
|
/**
|
|
* skwq_has_sleeper - check if there are any waiting processes
|
|
* @wq: struct socket_wq
|
|
*
|
|
* Returns true if socket_wq has waiting processes
|
|
*
|
|
* The purpose of the skwq_has_sleeper and sock_poll_wait is to wrap the memory
|
|
* barrier call. They were added due to the race found within the tcp code.
|
|
*
|
|
* Consider following tcp code paths:
|
|
*
|
|
* CPU1 CPU2
|
|
*
|
|
* sys_select receive packet
|
|
* ... ...
|
|
* __add_wait_queue update tp->rcv_nxt
|
|
* ... ...
|
|
* tp->rcv_nxt check sock_def_readable
|
|
* ... {
|
|
* schedule rcu_read_lock();
|
|
* wq = rcu_dereference(sk->sk_wq);
|
|
* if (wq && waitqueue_active(&wq->wait))
|
|
* wake_up_interruptible(&wq->wait)
|
|
* ...
|
|
* }
|
|
*
|
|
* The race for tcp fires when the __add_wait_queue changes done by CPU1 stay
|
|
* in its cache, and so does the tp->rcv_nxt update on CPU2 side. The CPU1
|
|
* could then endup calling schedule and sleep forever if there are no more
|
|
* data on the socket.
|
|
*
|
|
*/
|
|
static inline bool skwq_has_sleeper(struct socket_wq *wq)
|
|
{
|
|
return wq && wq_has_sleeper(&wq->wait);
|
|
}
|
|
|
|
/**
|
|
* sock_poll_wait - place memory barrier behind the poll_wait call.
|
|
* @filp: file
|
|
* @wait_address: socket wait queue
|
|
* @p: poll_table
|
|
*
|
|
* See the comments in the wq_has_sleeper function.
|
|
*/
|
|
static inline void sock_poll_wait(struct file *filp,
|
|
wait_queue_head_t *wait_address, poll_table *p)
|
|
{
|
|
if (!poll_does_not_wait(p) && wait_address) {
|
|
poll_wait(filp, wait_address, p);
|
|
/* We need to be sure we are in sync with the
|
|
* socket flags modification.
|
|
*
|
|
* This memory barrier is paired in the wq_has_sleeper.
|
|
*/
|
|
smp_mb();
|
|
}
|
|
}
|
|
|
|
static inline void skb_set_hash_from_sk(struct sk_buff *skb, struct sock *sk)
|
|
{
|
|
if (sk->sk_txhash) {
|
|
skb->l4_hash = 1;
|
|
skb->hash = sk->sk_txhash;
|
|
}
|
|
}
|
|
|
|
void skb_set_owner_w(struct sk_buff *skb, struct sock *sk);
|
|
|
|
/*
|
|
* 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_r(struct sk_buff *skb, struct sock *sk)
|
|
{
|
|
skb_orphan(skb);
|
|
skb->sk = sk;
|
|
skb->destructor = sock_rfree;
|
|
atomic_add(skb->truesize, &sk->sk_rmem_alloc);
|
|
sk_mem_charge(sk, skb->truesize);
|
|
}
|
|
|
|
void sk_reset_timer(struct sock *sk, struct timer_list *timer,
|
|
unsigned long expires);
|
|
|
|
void sk_stop_timer(struct sock *sk, struct timer_list *timer);
|
|
|
|
int __sk_queue_drop_skb(struct sock *sk, struct sk_buff *skb,
|
|
unsigned int flags);
|
|
int __sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb);
|
|
int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb);
|
|
|
|
int sock_queue_err_skb(struct sock *sk, struct sk_buff *skb);
|
|
struct sk_buff *sock_dequeue_err_skb(struct sock *sk);
|
|
|
|
/*
|
|
* 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;
|
|
}
|
|
|
|
/* Note:
|
|
* We use sk->sk_wq_raw, from contexts knowing this
|
|
* pointer is not NULL and cannot disappear/change.
|
|
*/
|
|
static inline void sk_set_bit(int nr, struct sock *sk)
|
|
{
|
|
if ((nr == SOCKWQ_ASYNC_NOSPACE || nr == SOCKWQ_ASYNC_WAITDATA) &&
|
|
!sock_flag(sk, SOCK_FASYNC))
|
|
return;
|
|
|
|
set_bit(nr, &sk->sk_wq_raw->flags);
|
|
}
|
|
|
|
static inline void sk_clear_bit(int nr, struct sock *sk)
|
|
{
|
|
if ((nr == SOCKWQ_ASYNC_NOSPACE || nr == SOCKWQ_ASYNC_WAITDATA) &&
|
|
!sock_flag(sk, SOCK_FASYNC))
|
|
return;
|
|
|
|
clear_bit(nr, &sk->sk_wq_raw->flags);
|
|
}
|
|
|
|
static inline void sk_wake_async(const struct sock *sk, int how, int band)
|
|
{
|
|
if (sock_flag(sk, SOCK_FASYNC)) {
|
|
rcu_read_lock();
|
|
sock_wake_async(rcu_dereference(sk->sk_wq), how, band);
|
|
rcu_read_unlock();
|
|
}
|
|
}
|
|
|
|
/* Since sk_{r,w}mem_alloc sums skb->truesize, even a small frame might
|
|
* need sizeof(sk_buff) + MTU + padding, unless net driver perform copybreak.
|
|
* Note: for send buffers, TCP works better if we can build two skbs at
|
|
* minimum.
|
|
*/
|
|
#define TCP_SKB_MIN_TRUESIZE (2048 + SKB_DATA_ALIGN(sizeof(struct sk_buff)))
|
|
|
|
#define SOCK_MIN_SNDBUF (TCP_SKB_MIN_TRUESIZE * 2)
|
|
#define SOCK_MIN_RCVBUF TCP_SKB_MIN_TRUESIZE
|
|
|
|
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 >> 1);
|
|
sk->sk_sndbuf = max_t(u32, sk->sk_sndbuf, SOCK_MIN_SNDBUF);
|
|
}
|
|
}
|
|
|
|
struct sk_buff *sk_stream_alloc_skb(struct sock *sk, int size, gfp_t gfp,
|
|
bool force_schedule);
|
|
|
|
/**
|
|
* sk_page_frag - return an appropriate page_frag
|
|
* @sk: socket
|
|
*
|
|
* If socket allocation mode allows current thread to sleep, it means its
|
|
* safe to use the per task page_frag instead of the per socket one.
|
|
*/
|
|
static inline struct page_frag *sk_page_frag(struct sock *sk)
|
|
{
|
|
if (gfpflags_allow_blocking(sk->sk_allocation))
|
|
return ¤t->task_frag;
|
|
|
|
return &sk->sk_frag;
|
|
}
|
|
|
|
bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag);
|
|
|
|
/*
|
|
* Default write policy as shown to user space via poll/select/SIGIO
|
|
*/
|
|
static inline bool sock_writeable(const struct sock *sk)
|
|
{
|
|
return atomic_read(&sk->sk_wmem_alloc) < (sk->sk_sndbuf >> 1);
|
|
}
|
|
|
|
static inline gfp_t gfp_any(void)
|
|
{
|
|
return in_softirq() ? GFP_ATOMIC : GFP_KERNEL;
|
|
}
|
|
|
|
static inline long sock_rcvtimeo(const struct sock *sk, bool noblock)
|
|
{
|
|
return noblock ? 0 : sk->sk_rcvtimeo;
|
|
}
|
|
|
|
static inline long sock_sndtimeo(const struct sock *sk, bool 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;
|
|
}
|
|
|
|
struct sock_skb_cb {
|
|
u32 dropcount;
|
|
};
|
|
|
|
/* Store sock_skb_cb at the end of skb->cb[] so protocol families
|
|
* using skb->cb[] would keep using it directly and utilize its
|
|
* alignement guarantee.
|
|
*/
|
|
#define SOCK_SKB_CB_OFFSET ((FIELD_SIZEOF(struct sk_buff, cb) - \
|
|
sizeof(struct sock_skb_cb)))
|
|
|
|
#define SOCK_SKB_CB(__skb) ((struct sock_skb_cb *)((__skb)->cb + \
|
|
SOCK_SKB_CB_OFFSET))
|
|
|
|
#define sock_skb_cb_check_size(size) \
|
|
BUILD_BUG_ON((size) > SOCK_SKB_CB_OFFSET)
|
|
|
|
static inline void
|
|
sock_skb_set_dropcount(const struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
SOCK_SKB_CB(skb)->dropcount = sock_flag(sk, SOCK_RXQ_OVFL) ?
|
|
atomic_read(&sk->sk_drops) : 0;
|
|
}
|
|
|
|
static inline void sk_drops_add(struct sock *sk, const struct sk_buff *skb)
|
|
{
|
|
int segs = max_t(u16, 1, skb_shinfo(skb)->gso_segs);
|
|
|
|
atomic_add(segs, &sk->sk_drops);
|
|
}
|
|
|
|
void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk,
|
|
struct sk_buff *skb);
|
|
void __sock_recv_wifi_status(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;
|
|
struct skb_shared_hwtstamps *hwtstamps = skb_hwtstamps(skb);
|
|
|
|
/*
|
|
* generate control messages if
|
|
* - receive time stamping in software requested
|
|
* - software time stamp available and wanted
|
|
* - hardware time stamps available and wanted
|
|
*/
|
|
if (sock_flag(sk, SOCK_RCVTSTAMP) ||
|
|
(sk->sk_tsflags & SOF_TIMESTAMPING_RX_SOFTWARE) ||
|
|
(kt && sk->sk_tsflags & SOF_TIMESTAMPING_SOFTWARE) ||
|
|
(hwtstamps->hwtstamp &&
|
|
(sk->sk_tsflags & SOF_TIMESTAMPING_RAW_HARDWARE)))
|
|
__sock_recv_timestamp(msg, sk, skb);
|
|
else
|
|
sk->sk_stamp = kt;
|
|
|
|
if (sock_flag(sk, SOCK_WIFI_STATUS) && skb->wifi_acked_valid)
|
|
__sock_recv_wifi_status(msg, sk, skb);
|
|
}
|
|
|
|
void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk,
|
|
struct sk_buff *skb);
|
|
|
|
static inline void sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk,
|
|
struct sk_buff *skb)
|
|
{
|
|
#define FLAGS_TS_OR_DROPS ((1UL << SOCK_RXQ_OVFL) | \
|
|
(1UL << SOCK_RCVTSTAMP))
|
|
#define TSFLAGS_ANY (SOF_TIMESTAMPING_SOFTWARE | \
|
|
SOF_TIMESTAMPING_RAW_HARDWARE)
|
|
|
|
if (sk->sk_flags & FLAGS_TS_OR_DROPS || sk->sk_tsflags & TSFLAGS_ANY)
|
|
__sock_recv_ts_and_drops(msg, sk, skb);
|
|
else
|
|
sk->sk_stamp = skb->tstamp;
|
|
}
|
|
|
|
void __sock_tx_timestamp(__u16 tsflags, __u8 *tx_flags);
|
|
|
|
/**
|
|
* sock_tx_timestamp - checks whether the outgoing packet is to be time stamped
|
|
* @sk: socket sending this packet
|
|
* @tsflags: timestamping flags to use
|
|
* @tx_flags: completed with instructions for time stamping
|
|
*
|
|
* Note : callers should take care of initial *tx_flags value (usually 0)
|
|
*/
|
|
static inline void sock_tx_timestamp(const struct sock *sk, __u16 tsflags,
|
|
__u8 *tx_flags)
|
|
{
|
|
if (unlikely(tsflags))
|
|
__sock_tx_timestamp(tsflags, tx_flags);
|
|
if (unlikely(sock_flag(sk, SOCK_WIFI_STATUS)))
|
|
*tx_flags |= SKBTX_WIFI_STATUS;
|
|
}
|
|
|
|
/**
|
|
* sk_eat_skb - Release a skb if it is no longer needed
|
|
* @sk: socket to eat this skb from
|
|
* @skb: socket buffer to eat
|
|
*
|
|
* This routine must be called with interrupts disabled or with the socket
|
|
* locked so that the sk_buff queue operation is ok.
|
|
*/
|
|
static inline void sk_eat_skb(struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
__skb_unlink(skb, &sk->sk_receive_queue);
|
|
__kfree_skb(skb);
|
|
}
|
|
|
|
static inline
|
|
struct net *sock_net(const struct sock *sk)
|
|
{
|
|
return read_pnet(&sk->sk_net);
|
|
}
|
|
|
|
static inline
|
|
void sock_net_set(struct sock *sk, struct net *net)
|
|
{
|
|
write_pnet(&sk->sk_net, net);
|
|
}
|
|
|
|
static inline struct sock *skb_steal_sock(struct sk_buff *skb)
|
|
{
|
|
if (skb->sk) {
|
|
struct sock *sk = skb->sk;
|
|
|
|
skb->destructor = NULL;
|
|
skb->sk = NULL;
|
|
return sk;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/* This helper checks if a socket is a full socket,
|
|
* ie _not_ a timewait or request socket.
|
|
*/
|
|
static inline bool sk_fullsock(const struct sock *sk)
|
|
{
|
|
return (1 << sk->sk_state) & ~(TCPF_TIME_WAIT | TCPF_NEW_SYN_RECV);
|
|
}
|
|
|
|
/* This helper checks if a socket is a LISTEN or NEW_SYN_RECV
|
|
* SYNACK messages can be attached to either ones (depending on SYNCOOKIE)
|
|
*/
|
|
static inline bool sk_listener(const struct sock *sk)
|
|
{
|
|
return (1 << sk->sk_state) & (TCPF_LISTEN | TCPF_NEW_SYN_RECV);
|
|
}
|
|
|
|
/**
|
|
* sk_state_load - read sk->sk_state for lockless contexts
|
|
* @sk: socket pointer
|
|
*
|
|
* Paired with sk_state_store(). Used in places we do not hold socket lock :
|
|
* tcp_diag_get_info(), tcp_get_info(), tcp_poll(), get_tcp4_sock() ...
|
|
*/
|
|
static inline int sk_state_load(const struct sock *sk)
|
|
{
|
|
return smp_load_acquire(&sk->sk_state);
|
|
}
|
|
|
|
/**
|
|
* sk_state_store - update sk->sk_state
|
|
* @sk: socket pointer
|
|
* @newstate: new state
|
|
*
|
|
* Paired with sk_state_load(). Should be used in contexts where
|
|
* state change might impact lockless readers.
|
|
*/
|
|
static inline void sk_state_store(struct sock *sk, int newstate)
|
|
{
|
|
smp_store_release(&sk->sk_state, newstate);
|
|
}
|
|
|
|
void sock_enable_timestamp(struct sock *sk, int flag);
|
|
int sock_get_timestamp(struct sock *, struct timeval __user *);
|
|
int sock_get_timestampns(struct sock *, struct timespec __user *);
|
|
int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len, int level,
|
|
int type);
|
|
|
|
bool sk_ns_capable(const struct sock *sk,
|
|
struct user_namespace *user_ns, int cap);
|
|
bool sk_capable(const struct sock *sk, int cap);
|
|
bool sk_net_capable(const struct sock *sk, int cap);
|
|
|
|
extern __u32 sysctl_wmem_max;
|
|
extern __u32 sysctl_rmem_max;
|
|
|
|
extern int sysctl_tstamp_allow_data;
|
|
extern int sysctl_optmem_max;
|
|
|
|
extern __u32 sysctl_wmem_default;
|
|
extern __u32 sysctl_rmem_default;
|
|
|
|
#endif /* _SOCK_H */
|