/* * INET An implementation of the TCP/IP protocol suite for the LINUX * operating system. INET is implemented using the BSD Socket * interface as the means of communication with the user level. * * Definitions for the AF_INET socket handler. * * Version: @(#)sock.h 1.0.4 05/13/93 * * Authors: Ross Biro * Fred N. van Kempen, * Corey Minyard * Florian La Roche * * Fixes: * Alan Cox : Volatiles in skbuff pointers. See * skbuff comments. May be overdone, * better to prove they can be removed * than the reverse. * Alan Cox : Added a zapped field for tcp to note * a socket is reset and must stay shut up * Alan Cox : New fields for options * Pauline Middelink : identd support * Alan Cox : Eliminate low level recv/recvfrom * David S. Miller : New socket lookup architecture. * Steve Whitehouse: Default routines for sock_ops * Arnaldo C. Melo : removed net_pinfo, tp_pinfo and made * protinfo be just a void pointer, as the * protocol specific parts were moved to * respective headers and ipv4/v6, etc now * use private slabcaches for its socks * Pedro Hortas : New flags field for socket options * * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ #ifndef _SOCK_H #define _SOCK_H #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include struct cgroup; struct cgroup_subsys; #ifdef CONFIG_NET int mem_cgroup_sockets_init(struct cgroup *cgrp, struct cgroup_subsys *ss); void mem_cgroup_sockets_destroy(struct cgroup *cgrp); #else static inline int mem_cgroup_sockets_init(struct cgroup *cgrp, struct cgroup_subsys *ss) { return 0; } static inline void mem_cgroup_sockets_destroy(struct cgroup *cgrp) { } #endif #define SOCK_DEBUGGING #ifdef SOCK_DEBUGGING #define SOCK_DEBUG(sk, msg...) do { if ((sk) && sock_flag((sk), SOCK_DBG)) \ printk(KERN_DEBUG msg); } while (0) #else static inline __printf(2, 3) void SOCK_DEBUG(struct sock *sk, const char *msg, ...) { } #endif typedef struct { spinlock_t slock; int owned; wait_queue_head_t wq; #ifdef CONFIG_DEBUG_LOCK_ALLOC struct lockdep_map dep_map; #endif } socket_lock_t; struct sock; struct proto; struct net; struct sock_common { __be32 skc_daddr; __be32 skc_rcv_saddr; union { unsigned int skc_hash; __u16 skc_u16hashes[2]; }; unsigned short skc_family; volatile unsigned char skc_state; unsigned char skc_reuse; int skc_bound_dev_if; union { struct hlist_node skc_bind_node; struct hlist_nulls_node skc_portaddr_node; }; struct proto *skc_prot; #ifdef CONFIG_NET_NS struct net *skc_net; #endif int skc_dontcopy_begin[0]; union { struct hlist_node skc_node; struct hlist_nulls_node skc_nulls_node; }; int skc_tx_queue_mapping; atomic_t skc_refcnt; int skc_dontcopy_end[0]; }; struct cg_proto; struct sock { struct sock_common __sk_common; #define sk_node __sk_common.skc_node #define sk_nulls_node __sk_common.skc_nulls_node #define sk_refcnt __sk_common.skc_refcnt #define sk_tx_queue_mapping __sk_common.skc_tx_queue_mapping #define sk_dontcopy_begin __sk_common.skc_dontcopy_begin #define sk_dontcopy_end __sk_common.skc_dontcopy_end #define sk_hash __sk_common.skc_hash #define sk_family __sk_common.skc_family #define sk_state __sk_common.skc_state #define sk_reuse __sk_common.skc_reuse #define sk_bound_dev_if __sk_common.skc_bound_dev_if #define sk_bind_node __sk_common.skc_bind_node #define sk_prot __sk_common.skc_prot #define sk_net __sk_common.skc_net socket_lock_t sk_lock; struct sk_buff_head sk_receive_queue; struct { atomic_t rmem_alloc; int len; struct sk_buff *head; struct sk_buff *tail; } sk_backlog; #define sk_rmem_alloc sk_backlog.rmem_alloc int sk_forward_alloc; #ifdef CONFIG_RPS __u32 sk_rxhash; #endif atomic_t sk_drops; int sk_rcvbuf; struct sk_filter __rcu *sk_filter; struct socket_wq __rcu *sk_wq; #ifdef CONFIG_NET_DMA struct sk_buff_head sk_async_wait_queue; #endif #ifdef CONFIG_XFRM struct xfrm_policy *sk_policy[2]; #endif unsigned long sk_flags; struct dst_entry *sk_dst_cache; spinlock_t sk_dst_lock; atomic_t sk_wmem_alloc; atomic_t sk_omem_alloc; int sk_sndbuf; struct sk_buff_head sk_write_queue; kmemcheck_bitfield_begin(flags); unsigned int sk_shutdown : 2, sk_no_check : 2, sk_userlocks : 4, sk_protocol : 8, sk_type : 16; kmemcheck_bitfield_end(flags); int sk_wmem_queued; gfp_t sk_allocation; netdev_features_t sk_route_caps; netdev_features_t sk_route_nocaps; int sk_gso_type; unsigned int sk_gso_max_size; int sk_rcvlowat; unsigned long sk_lingertime; struct sk_buff_head sk_error_queue; struct proto *sk_prot_creator; rwlock_t sk_callback_lock; int sk_err, sk_err_soft; unsigned short sk_ack_backlog; unsigned short sk_max_ack_backlog; __u32 sk_priority; #ifdef CONFIG_CGROUPS __u32 sk_cgrp_prioidx; #endif struct pid *sk_peer_pid; const struct cred *sk_peer_cred; long sk_rcvtimeo; long sk_sndtimeo; void *sk_protinfo; struct timer_list sk_timer; ktime_t sk_stamp; struct socket *sk_socket; void *sk_user_data; struct page *sk_sndmsg_page; struct sk_buff *sk_send_head; __u32 sk_sndmsg_off; __s32 sk_peek_off; int sk_write_pending; #ifdef CONFIG_SECURITY void *sk_security; #endif __u32 sk_mark; u32 sk_classid; struct cg_proto *sk_cgrp; void (*sk_state_change)(struct sock *sk); void (*sk_data_ready)(struct sock *sk, int bytes); 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); }; static inline int sk_peek_offset(struct sock *sk, int flags) { if ((flags & MSG_PEEK) && (sk->sk_peek_off >= 0)) return sk->sk_peek_off; else return 0; } static inline void sk_peek_offset_bwd(struct sock *sk, int val) { if (sk->sk_peek_off >= 0) { if (sk->sk_peek_off >= val) sk->sk_peek_off -= val; else sk->sk_peek_off = 0; } } static inline void sk_peek_offset_fwd(struct sock *sk, int val) { if (sk->sk_peek_off >= 0) sk->sk_peek_off += val; } 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 sk->sk_node.next ? hlist_entry(sk->sk_node.next, struct sock, sk_node) : NULL; } 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 int sk_unhashed(const struct sock *sk) { return hlist_unhashed(&sk->sk_node); } static inline int 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); } static __inline__ int __sk_del_node_init(struct sock *sk) { if (sk_hashed(sk)) { __sk_del_node(sk); sk_node_init(&sk->sk_node); return 1; } return 0; } static inline void sock_hold(struct sock *sk) { atomic_inc(&sk->sk_refcnt); } static inline void __sock_put(struct sock *sk) { atomic_dec(&sk->sk_refcnt); } static __inline__ int sk_del_node_init(struct sock *sk) { int rc = __sk_del_node_init(sk); if (rc) { 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__ int __sk_nulls_del_node_init_rcu(struct sock *sk) { if (sk_hashed(sk)) { hlist_nulls_del_init_rcu(&sk->sk_nulls_node); return 1; } return 0; } static __inline__ int sk_nulls_del_node_init_rcu(struct sock *sk) { int rc = __sk_nulls_del_node_init_rcu(sk); if (rc) { 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); hlist_add_head_rcu(&sk->sk_node, list); } static __inline__ void __sk_nulls_add_node_rcu(struct sock *sk, struct hlist_nulls_head *list) { 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, node, list) \ hlist_for_each_entry(__sk, node, list, sk_node) #define sk_for_each_rcu(__sk, node, list) \ hlist_for_each_entry_rcu(__sk, node, 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, node) \ if (__sk && ({ node = &(__sk)->sk_node; 1; })) \ hlist_for_each_entry_from(__sk, node, 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, node, tmp, list) \ hlist_for_each_entry_safe(__sk, node, tmp, list, sk_node) #define sk_for_each_bound(__sk, node, list) \ hlist_for_each_entry(__sk, node, list, sk_bind_node) 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, SOCK_DBG, SOCK_RCVTSTAMP, SOCK_RCVTSTAMPNS, SOCK_LOCALROUTE, SOCK_QUEUE_SHRUNK, SOCK_TIMESTAMPING_TX_HARDWARE, SOCK_TIMESTAMPING_TX_SOFTWARE, SOCK_TIMESTAMPING_RX_HARDWARE, SOCK_TIMESTAMPING_RX_SOFTWARE, SOCK_TIMESTAMPING_SOFTWARE, SOCK_TIMESTAMPING_RAW_HARDWARE, SOCK_TIMESTAMPING_SYS_HARDWARE, SOCK_FASYNC, SOCK_RXQ_OVFL, SOCK_ZEROCOPY, SOCK_WIFI_STATUS, SOCK_NOFCS, }; 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 int sock_flag(struct sock *sk, enum sock_flags flag) { return test_bit(flag, &sk->sk_flags); } 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 int sk_acceptq_is_full(struct sock *sk) { return sk->sk_ack_backlog > sk->sk_max_ack_backlog; } static inline int sk_stream_min_wspace(struct sock *sk) { return sk->sk_wmem_queued >> 1; } static inline int sk_stream_wspace(struct sock *sk) { return sk->sk_sndbuf - sk->sk_wmem_queued; } extern void sk_stream_write_space(struct sock *sk); static inline int sk_stream_memory_free(struct sock *sk) { return sk->sk_wmem_queued < sk->sk_sndbuf; } static inline void __sk_add_backlog(struct sock *sk, struct sk_buff *skb) { skb_dst_force(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; } static inline bool sk_rcvqueues_full(const struct sock *sk, const struct sk_buff *skb) { unsigned int qsize = sk->sk_backlog.len + atomic_read(&sk->sk_rmem_alloc); return qsize > sk->sk_rcvbuf; } static inline __must_check int sk_add_backlog(struct sock *sk, struct sk_buff *skb) { if (sk_rcvqueues_full(sk, skb)) return -ENOBUFS; __sk_add_backlog(sk, skb); sk->sk_backlog.len += skb->truesize; return 0; } static inline int sk_backlog_rcv(struct sock *sk, struct sk_buff *skb) { return sk->sk_backlog_rcv(sk, skb); } static inline void sock_rps_record_flow(const struct sock *sk) { #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, sk->sk_rxhash); rcu_read_unlock(); #endif } static inline void sock_rps_reset_flow(const struct sock *sk) { #ifdef CONFIG_RPS struct rps_sock_flow_table *sock_flow_table; rcu_read_lock(); sock_flow_table = rcu_dereference(rps_sock_flow_table); rps_reset_sock_flow(sock_flow_table, sk->sk_rxhash); rcu_read_unlock(); #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->rxhash)) { sock_rps_reset_flow(sk); sk->sk_rxhash = skb->rxhash; } #endif } static inline void sock_rps_reset_rxhash(struct sock *sk) { #ifdef CONFIG_RPS sock_rps_reset_flow(sk); sk->sk_rxhash = 0; #endif } #define sk_wait_event(__sk, __timeo, __condition) \ ({ int __rc; \ release_sock(__sk); \ __rc = __condition; \ if (!__rc) { \ *(__timeo) = schedule_timeout(*(__timeo)); \ } \ lock_sock(__sk); \ __rc = __condition; \ __rc; \ }) extern int sk_stream_wait_connect(struct sock *sk, long *timeo_p); extern int sk_stream_wait_memory(struct sock *sk, long *timeo_p); extern void sk_stream_wait_close(struct sock *sk, long timeo_p); extern int sk_stream_error(struct sock *sk, int flags, int err); extern void sk_stream_kill_queues(struct sock *sk); extern int sk_wait_data(struct sock *sk, long *timeo); struct request_sock_ops; struct timewait_sock_ops; struct inet_hashinfo; struct raw_hashinfo; struct module; 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); #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 kiocb *iocb, struct sock *sk, struct msghdr *msg, size_t len); int (*recvmsg)(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, size_t len, int noblock, int flags, int *addr_len); int (*sendpage)(struct sock *sk, struct page *page, int offset, size_t size, int flags); int (*bind)(struct sock *sk, struct sockaddr *uaddr, int addr_len); int (*backlog_rcv) (struct sock *sk, struct sk_buff *skb); void (*hash)(struct sock *sk); void (*unhash)(struct sock *sk); void (*rehash)(struct sock *sk); int (*get_port)(struct sock *sk, unsigned short snum); void (*clear_sk)(struct sock *sk, int size); #ifdef CONFIG_PROC_FS unsigned int inuse_idx; #endif void (*enter_memory_pressure)(struct sock *sk); atomic_long_t *memory_allocated; struct percpu_counter *sockets_allocated; 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; } h; struct module *owner; char name[32]; struct list_head node; #ifdef SOCK_REFCNT_DEBUG atomic_t socks; #endif #ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM int (*init_cgroup)(struct cgroup *cgrp, struct cgroup_subsys *ss); void (*destroy_cgroup)(struct cgroup *cgrp); struct cg_proto *(*proto_cgroup)(struct mem_cgroup *memcg); #endif }; struct cg_proto { void (*enter_memory_pressure)(struct sock *sk); struct res_counter *memory_allocated; struct percpu_counter *sockets_allocated; int *memory_pressure; long *sysctl_mem; struct mem_cgroup *memcg; }; extern int proto_register(struct proto *prot, int alloc_slab); extern void proto_unregister(struct proto *prot); #ifdef SOCK_REFCNT_DEBUG static inline void sk_refcnt_debug_inc(struct sock *sk) { atomic_inc(&sk->sk_prot->socks); } static inline void sk_refcnt_debug_dec(struct sock *sk) { atomic_dec(&sk->sk_prot->socks); printk(KERN_DEBUG "%s socket %p released, %d are still alive\n", sk->sk_prot->name, sk, atomic_read(&sk->sk_prot->socks)); } 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 #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 #if defined(CONFIG_CGROUP_MEM_RES_CTLR_KMEM) && defined(CONFIG_NET) extern struct static_key memcg_socket_limit_enabled; static inline struct cg_proto *parent_cg_proto(struct proto *proto, struct cg_proto *cg_proto) { return proto->proto_cgroup(parent_mem_cgroup(cg_proto->memcg)); } #define mem_cgroup_sockets_enabled static_key_false(&memcg_socket_limit_enabled) #else #define mem_cgroup_sockets_enabled 0 static inline struct cg_proto *parent_cg_proto(struct proto *proto, struct cg_proto *cg_proto) { return NULL; } #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_cgrp) return !!*sk->sk_cgrp->memory_pressure; 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; if (mem_cgroup_sockets_enabled && sk->sk_cgrp) { struct cg_proto *cg_proto = sk->sk_cgrp; struct proto *prot = sk->sk_prot; for (; cg_proto; cg_proto = parent_cg_proto(prot, cg_proto)) if (*cg_proto->memory_pressure) *cg_proto->memory_pressure = 0; } } static inline void sk_enter_memory_pressure(struct sock *sk) { if (!sk->sk_prot->enter_memory_pressure) return; if (mem_cgroup_sockets_enabled && sk->sk_cgrp) { struct cg_proto *cg_proto = sk->sk_cgrp; struct proto *prot = sk->sk_prot; for (; cg_proto; cg_proto = parent_cg_proto(prot, cg_proto)) cg_proto->enter_memory_pressure(sk); } sk->sk_prot->enter_memory_pressure(sk); } static inline long sk_prot_mem_limits(const struct sock *sk, int index) { long *prot = sk->sk_prot->sysctl_mem; if (mem_cgroup_sockets_enabled && sk->sk_cgrp) prot = sk->sk_cgrp->sysctl_mem; return prot[index]; } static inline void memcg_memory_allocated_add(struct cg_proto *prot, unsigned long amt, int *parent_status) { struct res_counter *fail; int ret; ret = res_counter_charge_nofail(prot->memory_allocated, amt << PAGE_SHIFT, &fail); if (ret < 0) *parent_status = OVER_LIMIT; } static inline void memcg_memory_allocated_sub(struct cg_proto *prot, unsigned long amt) { res_counter_uncharge(prot->memory_allocated, amt << PAGE_SHIFT); } static inline u64 memcg_memory_allocated_read(struct cg_proto *prot) { u64 ret; ret = res_counter_read_u64(prot->memory_allocated, RES_USAGE); return ret >> PAGE_SHIFT; } static inline long sk_memory_allocated(const struct sock *sk) { struct proto *prot = sk->sk_prot; if (mem_cgroup_sockets_enabled && sk->sk_cgrp) return memcg_memory_allocated_read(sk->sk_cgrp); return atomic_long_read(prot->memory_allocated); } static inline long sk_memory_allocated_add(struct sock *sk, int amt, int *parent_status) { struct proto *prot = sk->sk_prot; if (mem_cgroup_sockets_enabled && sk->sk_cgrp) { memcg_memory_allocated_add(sk->sk_cgrp, amt, parent_status); atomic_long_add_return(amt, prot->memory_allocated); return memcg_memory_allocated_read(sk->sk_cgrp); } return atomic_long_add_return(amt, prot->memory_allocated); } static inline void sk_memory_allocated_sub(struct sock *sk, int amt) { struct proto *prot = sk->sk_prot; if (mem_cgroup_sockets_enabled && sk->sk_cgrp) memcg_memory_allocated_sub(sk->sk_cgrp, amt); atomic_long_sub(amt, prot->memory_allocated); } static inline void sk_sockets_allocated_dec(struct sock *sk) { struct proto *prot = sk->sk_prot; if (mem_cgroup_sockets_enabled && sk->sk_cgrp) { struct cg_proto *cg_proto = sk->sk_cgrp; for (; cg_proto; cg_proto = parent_cg_proto(prot, cg_proto)) percpu_counter_dec(cg_proto->sockets_allocated); } percpu_counter_dec(prot->sockets_allocated); } static inline void sk_sockets_allocated_inc(struct sock *sk) { struct proto *prot = sk->sk_prot; if (mem_cgroup_sockets_enabled && sk->sk_cgrp) { struct cg_proto *cg_proto = sk->sk_cgrp; for (; cg_proto; cg_proto = parent_cg_proto(prot, cg_proto)) percpu_counter_inc(cg_proto->sockets_allocated); } percpu_counter_inc(prot->sockets_allocated); } static inline int sk_sockets_allocated_read_positive(struct sock *sk) { struct proto *prot = sk->sk_prot; if (mem_cgroup_sockets_enabled && sk->sk_cgrp) return percpu_counter_read_positive(sk->sk_cgrp->sockets_allocated); return percpu_counter_read_positive(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 extern void sock_prot_inuse_add(struct net *net, struct proto *prot, int inc); extern int sock_prot_inuse_get(struct net *net, struct proto *proto); #else static void inline sock_prot_inuse_add(struct net *net, struct proto *prot, int inc) { } #endif static inline void __sk_prot_rehash(struct sock *sk) { sk->sk_prot->unhash(sk); sk->sk_prot->hash(sk); } void sk_prot_clear_portaddr_nulls(struct sock *sk, int size); #define SOCK_DESTROY_TIME (10*HZ) #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 sock_iocb { struct list_head list; int flags; int size; struct socket *sock; struct sock *sk; struct scm_cookie *scm; struct msghdr *msg, async_msg; struct kiocb *kiocb; }; static inline struct sock_iocb *kiocb_to_siocb(struct kiocb *iocb) { return (struct sock_iocb *)iocb->private; } static inline struct kiocb *siocb_to_kiocb(struct sock_iocb *si) { return si->kiocb; } struct socket_alloc { struct socket socket; struct inode vfs_inode; }; static inline struct socket *SOCKET_I(struct inode *inode) { return &container_of(inode, struct socket_alloc, vfs_inode)->socket; } static inline struct inode *SOCK_INODE(struct socket *socket) { return &container_of(socket, struct socket_alloc, socket)->vfs_inode; } extern int __sk_mem_schedule(struct sock *sk, int size, int kind); extern void __sk_mem_reclaim(struct sock *sk); #define SK_MEM_QUANTUM ((int)PAGE_SIZE) #define SK_MEM_QUANTUM_SHIFT ilog2(SK_MEM_QUANTUM) #define SK_MEM_SEND 0 #define SK_MEM_RECV 1 static inline int sk_mem_pages(int amt) { return (amt + SK_MEM_QUANTUM - 1) >> SK_MEM_QUANTUM_SHIFT; } static inline int sk_has_account(struct sock *sk) { return !!sk->sk_prot->memory_allocated; } static inline int sk_wmem_schedule(struct sock *sk, int size) { if (!sk_has_account(sk)) return 1; return size <= sk->sk_forward_alloc || __sk_mem_schedule(sk, size, SK_MEM_SEND); } static inline int sk_rmem_schedule(struct sock *sk, int size) { if (!sk_has_account(sk)) return 1; return size <= sk->sk_forward_alloc || __sk_mem_schedule(sk, size, SK_MEM_RECV); } 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); } 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); } 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; } 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); } #define sock_owned_by_user(sk) ((sk)->sk_lock.owned) #define sock_lock_init_class_and_name(sk, sname, skey, name, key) \ do { \ sk->sk_lock.owned = 0; \ init_waitqueue_head(&sk->sk_lock.wq); \ spin_lock_init(&(sk)->sk_lock.slock); \ debug_check_no_locks_freed((void *)&(sk)->sk_lock, \ sizeof((sk)->sk_lock)); \ lockdep_set_class_and_name(&(sk)->sk_lock.slock, \ (skey), (sname)); \ lockdep_init_map(&(sk)->sk_lock.dep_map, (name), (key), 0); \ } while (0) extern void lock_sock_nested(struct sock *sk, int subclass); static inline void lock_sock(struct sock *sk) { lock_sock_nested(sk, 0); } extern void release_sock(struct sock *sk); #define bh_lock_sock(__sk) spin_lock(&((__sk)->sk_lock.slock)) #define bh_lock_sock_nested(__sk) \ spin_lock_nested(&((__sk)->sk_lock.slock), \ SINGLE_DEPTH_NESTING) #define bh_unlock_sock(__sk) spin_unlock(&((__sk)->sk_lock.slock)) extern bool lock_sock_fast(struct sock *sk); static inline void unlock_sock_fast(struct sock *sk, bool slow) { if (slow) release_sock(sk); else spin_unlock_bh(&sk->sk_lock.slock); } extern struct sock *sk_alloc(struct net *net, int family, gfp_t priority, struct proto *prot); extern void sk_free(struct sock *sk); extern void sk_release_kernel(struct sock *sk); extern struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority); extern struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force, gfp_t priority); extern struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force, gfp_t priority); extern void sock_wfree(struct sk_buff *skb); extern void sock_rfree(struct sk_buff *skb); extern int sock_setsockopt(struct socket *sock, int level, int op, char __user *optval, unsigned int optlen); extern int sock_getsockopt(struct socket *sock, int level, int op, char __user *optval, int __user *optlen); extern struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size, int noblock, int *errcode); extern struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len, unsigned long data_len, int noblock, int *errcode); extern void *sock_kmalloc(struct sock *sk, int size, gfp_t priority); extern void sock_kfree_s(struct sock *sk, void *mem, int size); extern void sk_send_sigurg(struct sock *sk); #ifdef CONFIG_CGROUPS extern void sock_update_classid(struct sock *sk); #else static inline void sock_update_classid(struct sock *sk) { } #endif extern int sock_no_bind(struct socket *, struct sockaddr *, int); extern int sock_no_connect(struct socket *, struct sockaddr *, int, int); extern int sock_no_socketpair(struct socket *, struct socket *); extern int sock_no_accept(struct socket *, struct socket *, int); extern int sock_no_getname(struct socket *, struct sockaddr *, int *, int); extern unsigned int sock_no_poll(struct file *, struct socket *, struct poll_table_struct *); extern int sock_no_ioctl(struct socket *, unsigned int, unsigned long); extern int sock_no_listen(struct socket *, int); extern int sock_no_shutdown(struct socket *, int); extern int sock_no_getsockopt(struct socket *, int , int, char __user *, int __user *); extern int sock_no_setsockopt(struct socket *, int, int, char __user *, unsigned int); extern int sock_no_sendmsg(struct kiocb *, struct socket *, struct msghdr *, size_t); extern int sock_no_recvmsg(struct kiocb *, struct socket *, struct msghdr *, size_t, int); extern int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma); extern ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags); extern int sock_common_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen); extern int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t size, int flags); extern int sock_common_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen); extern int compat_sock_common_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen); extern int compat_sock_common_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen); extern void sk_common_release(struct sock *sk); extern void sock_init_data(struct socket *sock, struct sock *sk); extern void sk_filter_release_rcu(struct rcu_head *rcu); static inline void sk_filter_release(struct sk_filter *fp) { if (atomic_dec_and_test(&fp->refcnt)) call_rcu(&fp->rcu, sk_filter_release_rcu); } static inline void sk_filter_uncharge(struct sock *sk, struct sk_filter *fp) { unsigned int size = sk_filter_len(fp); atomic_sub(size, &sk->sk_omem_alloc); sk_filter_release(fp); } static inline void sk_filter_charge(struct sock *sk, struct sk_filter *fp) { atomic_inc(&fp->refcnt); atomic_add(sk_filter_len(fp), &sk->sk_omem_alloc); } static inline void sock_put(struct sock *sk) { if (atomic_dec_and_test(&sk->sk_refcnt)) sk_free(sk); } extern int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested); 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; } 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); security_sock_graft(sk, parent); write_unlock_bh(&sk->sk_callback_lock); } extern int sock_i_uid(struct sock *sk); extern unsigned long sock_i_ino(struct sock *sk); static inline struct dst_entry * __sk_dst_get(struct sock *sk) { return rcu_dereference_check(sk->sk_dst_cache, sock_owned_by_user(sk) || lockdep_is_held(&sk->sk_lock.slock)); } 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) dst_hold(dst); rcu_read_unlock(); return dst; } extern void sk_reset_txq(struct sock *sk); static inline void dst_negative_advice(struct sock *sk) { struct dst_entry *ndst, *dst = __sk_dst_get(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_reset_txq(sk); } } } 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 = 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) { spin_lock(&sk->sk_dst_lock); __sk_dst_set(sk, dst); spin_unlock(&sk->sk_dst_lock); } static inline void __sk_dst_reset(struct sock *sk) { __sk_dst_set(sk, NULL); } static inline void sk_dst_reset(struct sock *sk) { spin_lock(&sk->sk_dst_lock); __sk_dst_reset(sk); spin_unlock(&sk->sk_dst_lock); } extern struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie); extern struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie); static inline int sk_can_gso(const struct sock *sk) { return net_gso_ok(sk->sk_route_caps, sk->sk_gso_type); } extern void sk_setup_caps(struct sock *sk, struct dst_entry *dst); static inline void sk_nocaps_add(struct sock *sk, netdev_features_t flags) { sk->sk_route_nocaps |= flags; sk->sk_route_caps &= ~flags; } static inline int skb_do_copy_data_nocache(struct sock *sk, struct sk_buff *skb, char __user *from, char *to, int copy, int offset) { if (skb->ip_summed == CHECKSUM_NONE) { int err = 0; __wsum csum = csum_and_copy_from_user(from, to, copy, 0, &err); if (err) return err; skb->csum = csum_block_add(skb->csum, csum, offset); } else if (sk->sk_route_caps & NETIF_F_NOCACHE_COPY) { if (!access_ok(VERIFY_READ, from, copy) || __copy_from_user_nocache(to, from, copy)) return -EFAULT; } else if (copy_from_user(to, from, copy)) return -EFAULT; return 0; } static inline int skb_add_data_nocache(struct sock *sk, struct sk_buff *skb, char __user *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, char __user *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; } static inline int skb_copy_to_page(struct sock *sk, char __user *from, struct sk_buff *skb, struct page *page, int off, int copy) { if (skb->ip_summed == CHECKSUM_NONE) { int err = 0; __wsum csum = csum_and_copy_from_user(from, page_address(page) + off, copy, 0, &err); if (err) return err; skb->csum = csum_block_add(skb->csum, csum, skb->len); } else if (copy_from_user(page_address(page) + off, from, copy)) return -EFAULT; skb->len += copy; skb->data_len += copy; skb->truesize += copy; sk->sk_wmem_queued += copy; sk_mem_charge(sk, copy); return 0; } static inline int sk_wmem_alloc_get(const struct sock *sk) { return atomic_read(&sk->sk_wmem_alloc) - 1; } static inline int sk_rmem_alloc_get(const struct sock *sk) { return atomic_read(&sk->sk_rmem_alloc); } static inline int sk_has_allocations(const struct sock *sk) { return sk_wmem_alloc_get(sk) || sk_rmem_alloc_get(sk); } static inline bool wq_has_sleeper(struct socket_wq *wq) { smp_mb(); return wq && waitqueue_active(&wq->wait); } 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); smp_mb(); } } static inline void skb_set_owner_w(struct sk_buff *skb, struct sock *sk) { skb_orphan(skb); skb->sk = sk; skb->destructor = sock_wfree; atomic_add(skb->truesize, &sk->sk_wmem_alloc); } static inline void skb_set_owner_r(struct sk_buff *skb, struct sock *sk) { skb_orphan(skb); skb->sk = sk; skb->destructor = sock_rfree; atomic_add(skb->truesize, &sk->sk_rmem_alloc); sk_mem_charge(sk, skb->truesize); } extern void sk_reset_timer(struct sock *sk, struct timer_list* timer, unsigned long expires); extern void sk_stop_timer(struct sock *sk, struct timer_list* timer); extern int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb); extern int sock_queue_err_skb(struct sock *sk, struct sk_buff *skb); static inline int sock_error(struct sock *sk) { int err; if (likely(!sk->sk_err)) return 0; err = xchg(&sk->sk_err, 0); return -err; } static inline unsigned long sock_wspace(struct sock *sk) { int amt = 0; if (!(sk->sk_shutdown & SEND_SHUTDOWN)) { amt = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc); if (amt < 0) amt = 0; } return amt; } static inline void sk_wake_async(struct sock *sk, int how, int band) { if (sock_flag(sk, SOCK_FASYNC)) sock_wake_async(sk->sk_socket, how, band); } #define SOCK_MIN_SNDBUF 2048 #define SOCK_MIN_RCVBUF (2048 + sizeof(struct sk_buff)) 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(sk->sk_sndbuf, SOCK_MIN_SNDBUF); } } struct sk_buff *sk_stream_alloc_skb(struct sock *sk, int size, gfp_t gfp); static inline struct page *sk_stream_alloc_page(struct sock *sk) { struct page *page = NULL; page = alloc_pages(sk->sk_allocation, 0); if (!page) { sk_enter_memory_pressure(sk); sk_stream_moderate_sndbuf(sk); } return page; } static inline int 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, int noblock) { return noblock ? 0 : sk->sk_rcvtimeo; } static inline long sock_sndtimeo(const struct sock *sk, int noblock) { return noblock ? 0 : sk->sk_sndtimeo; } static inline int sock_rcvlowat(const struct sock *sk, int waitall, int len) { return (waitall ? len : min_t(int, sk->sk_rcvlowat, len)) ? : 1; } static inline int sock_intr_errno(long timeo) { return timeo == MAX_SCHEDULE_TIMEOUT ? -ERESTARTSYS : -EINTR; } extern void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk, struct sk_buff *skb); extern 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); if (sock_flag(sk, SOCK_RCVTSTAMP) || sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE) || (kt.tv64 && sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE)) || (hwtstamps->hwtstamp.tv64 && sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE)) || (hwtstamps->syststamp.tv64 && sock_flag(sk, SOCK_TIMESTAMPING_SYS_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); } extern 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) | \ (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE) | \ (1UL << SOCK_TIMESTAMPING_SOFTWARE) | \ (1UL << SOCK_TIMESTAMPING_RAW_HARDWARE) | \ (1UL << SOCK_TIMESTAMPING_SYS_HARDWARE)) if (sk->sk_flags & FLAGS_TS_OR_DROPS) __sock_recv_ts_and_drops(msg, sk, skb); else sk->sk_stamp = skb->tstamp; } extern int sock_tx_timestamp(struct sock *sk, __u8 *tx_flags); #ifdef CONFIG_NET_DMA static inline void sk_eat_skb(struct sock *sk, struct sk_buff *skb, int copied_early) { __skb_unlink(skb, &sk->sk_receive_queue); if (!copied_early) __kfree_skb(skb); else __skb_queue_tail(&sk->sk_async_wait_queue, skb); } #else static inline void sk_eat_skb(struct sock *sk, struct sk_buff *skb, int copied_early) { __skb_unlink(skb, &sk->sk_receive_queue); __kfree_skb(skb); } #endif 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 void sk_change_net(struct sock *sk, struct net *net) { put_net(sock_net(sk)); sock_net_set(sk, hold_net(net)); } static inline struct sock *skb_steal_sock(struct sk_buff *skb) { if (unlikely(skb->sk)) { struct sock *sk = skb->sk; skb->destructor = NULL; skb->sk = NULL; return sk; } return NULL; } extern void sock_enable_timestamp(struct sock *sk, int flag); extern int sock_get_timestamp(struct sock *, struct timeval __user *); extern int sock_get_timestampns(struct sock *, struct timespec __user *); extern int net_msg_warn; #define NETDEBUG(fmt, args...) \ do { if (net_msg_warn) printk(fmt,##args); } while (0) #define LIMIT_NETDEBUG(fmt, args...) \ do { if (net_msg_warn && net_ratelimit()) printk(fmt,##args); } while(0) extern __u32 sysctl_wmem_max; extern __u32 sysctl_rmem_max; extern void sk_init(void); extern int sysctl_optmem_max; extern __u32 sysctl_wmem_default; extern __u32 sysctl_rmem_default; #endif