| /* |
| * 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, <waltje@uWalt.NL.Mugnet.ORG> |
| * Corey Minyard <wf-rch!minyard@relay.EU.net> |
| * Florian La Roche <flla@stud.uni-sb.de> |
| * |
| * 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 <linux/hardirq.h> |
| #include <linux/kernel.h> |
| #include <linux/list.h> |
| #include <linux/list_nulls.h> |
| #include <linux/timer.h> |
| #include <linux/cache.h> |
| #include <linux/bitops.h> |
| #include <linux/lockdep.h> |
| #include <linux/netdevice.h> |
| #include <linux/skbuff.h> /* struct sk_buff */ |
| #include <linux/mm.h> |
| #include <linux/security.h> |
| #include <linux/slab.h> |
| #include <linux/uaccess.h> |
| #include <linux/memcontrol.h> |
| #include <linux/res_counter.h> |
| #include <linux/static_key.h> |
| #include <linux/aio.h> |
| #include <linux/sched.h> |
| |
| #include <linux/filter.h> |
| #include <linux/rculist_nulls.h> |
| #include <linux/poll.h> |
| |
| #include <linux/atomic.h> |
| #include <net/dst.h> |
| #include <net/checksum.h> |
| |
| struct cgroup; |
| struct cgroup_subsys; |
| #ifdef CONFIG_NET |
| int mem_cgroup_sockets_init(struct mem_cgroup *memcg, struct cgroup_subsys *ss); |
| void mem_cgroup_sockets_destroy(struct mem_cgroup *memcg); |
| #else |
| static inline |
| int mem_cgroup_sockets_init(struct mem_cgroup *memcg, struct cgroup_subsys *ss) |
| { |
| return 0; |
| } |
| static inline |
| void mem_cgroup_sockets_destroy(struct mem_cgroup *memcg) |
| { |
| } |
| #endif |
| /* |
| * This structure really needs to be cleaned up. |
| * Most of it is for TCP, and not used by any of |
| * the other protocols. |
| */ |
| |
| /* Define this to get the SOCK_DBG debugging facility. */ |
| #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 |
| /* Validate arguments and do nothing */ |
| static inline __printf(2, 3) |
| void SOCK_DEBUG(const struct sock *sk, const char *msg, ...) |
| { |
| } |
| #endif |
| |
| /* This is the per-socket lock. The spinlock provides a synchronization |
| * between user contexts and software interrupt processing, whereas the |
| * mini-semaphore synchronizes multiple users amongst themselves. |
| */ |
| typedef struct { |
| spinlock_t slock; |
| int owned; |
| wait_queue_head_t wq; |
| /* |
| * We express the mutex-alike socket_lock semantics |
| * to the lock validator by explicitly managing |
| * the slock as a lock variant (in addition to |
| * the slock itself): |
| */ |
| #ifdef CONFIG_DEBUG_LOCK_ALLOC |
| struct lockdep_map dep_map; |
| #endif |
| } socket_lock_t; |
| |
| struct sock; |
| struct proto; |
| struct net; |
| |
| typedef __u32 __bitwise __portpair; |
| typedef __u64 __bitwise __addrpair; |
| |
| /** |
| * struct sock_common - minimal network layer representation of sockets |
| * @skc_daddr: Foreign IPv4 addr |
| * @skc_rcv_saddr: Bound local IPv4 addr |
| * @skc_hash: hash value used with various protocol lookup tables |
| * @skc_u16hashes: two u16 hash values used by UDP lookup tables |
| * @skc_dport: placeholder for inet_dport/tw_dport |
| * @skc_num: placeholder for inet_num/tw_num |
| * @skc_family: network address family |
| * @skc_state: Connection state |
| * @skc_reuse: %SO_REUSEADDR setting |
| * @skc_reuseport: %SO_REUSEPORT setting |
| * @skc_bound_dev_if: bound device index if != 0 |
| * @skc_bind_node: bind hash linkage for various protocol lookup tables |
| * @skc_portaddr_node: second hash linkage for UDP/UDP-Lite protocol |
| * @skc_prot: protocol handlers inside a network family |
| * @skc_net: reference to the network namespace of this socket |
| * @skc_node: main hash linkage for various protocol lookup tables |
| * @skc_nulls_node: main hash linkage for TCP/UDP/UDP-Lite protocol |
| * @skc_tx_queue_mapping: tx queue number for this connection |
| * @skc_refcnt: reference count |
| * |
| * This is the minimal network layer representation of sockets, the header |
| * for struct sock and struct inet_timewait_sock. |
| */ |
| struct sock_common { |
| /* skc_daddr and skc_rcv_saddr must be grouped on a 8 bytes aligned |
| * address on 64bit arches : cf INET_MATCH() |
| */ |
| union { |
| __addrpair skc_addrpair; |
| struct { |
| __be32 skc_daddr; |
| __be32 skc_rcv_saddr; |
| }; |
| }; |
| union { |
| unsigned int skc_hash; |
| __u16 skc_u16hashes[2]; |
| }; |
| /* skc_dport && skc_num must be grouped as well */ |
| union { |
| __portpair skc_portpair; |
| struct { |
| __be16 skc_dport; |
| __u16 skc_num; |
| }; |
| }; |
| |
| unsigned short skc_family; |
| volatile unsigned char skc_state; |
| unsigned char skc_reuse:4; |
| unsigned char skc_reuseport:4; |
| 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 |
| |
| #if IS_ENABLED(CONFIG_IPV6) |
| struct in6_addr skc_v6_daddr; |
| struct in6_addr skc_v6_rcv_saddr; |
| #endif |
| |
| /* |
| * fields between dontcopy_begin/dontcopy_end |
| * are not copied in sock_copy() |
| */ |
| /* private: */ |
| int skc_dontcopy_begin[0]; |
| /* public: */ |
| union { |
| struct hlist_node skc_node; |
| struct hlist_nulls_node skc_nulls_node; |
| }; |
| int skc_tx_queue_mapping; |
| atomic_t skc_refcnt; |
| /* private: */ |
| int skc_dontcopy_end[0]; |
| /* public: */ |
| }; |
| |
| struct cg_proto; |
| /** |
| * struct sock - network layer representation of sockets |
| * @__sk_common: shared layout with inet_timewait_sock |
| * @sk_shutdown: mask of %SEND_SHUTDOWN and/or %RCV_SHUTDOWN |
| * @sk_userlocks: %SO_SNDBUF and %SO_RCVBUF settings |
| * @sk_lock: synchronizer |
| * @sk_rcvbuf: size of receive buffer in bytes |
| * @sk_wq: sock wait queue and async head |
| * @sk_rx_dst: receive input route used by early demux |
| * @sk_dst_cache: destination cache |
| * @sk_dst_lock: destination cache lock |
| * @sk_policy: flow policy |
| * @sk_receive_queue: incoming packets |
| * @sk_wmem_alloc: transmit queue bytes committed |
| * @sk_write_queue: Packet sending queue |
| * @sk_async_wait_queue: DMA copied packets |
| * @sk_omem_alloc: "o" is "option" or "other" |
| * @sk_wmem_queued: persistent queue size |
| * @sk_forward_alloc: space allocated forward |
| * @sk_napi_id: id of the last napi context to receive data for sk |
| * @sk_ll_usec: usecs to busypoll when there is no data |
| * @sk_allocation: allocation mode |
| * @sk_pacing_rate: Pacing rate (if supported by transport/packet scheduler) |
| * @sk_max_pacing_rate: Maximum pacing rate (%SO_MAX_PACING_RATE) |
| * @sk_sndbuf: size of send buffer in bytes |
| * @sk_flags: %SO_LINGER (l_onoff), %SO_BROADCAST, %SO_KEEPALIVE, |
| * %SO_OOBINLINE settings, %SO_TIMESTAMPING settings |
| * @sk_no_check_tx: %SO_NO_CHECK setting, set checksum in TX packets |
| * @sk_no_check_rx: allow zero checksum in RX packets |
| * @sk_route_caps: route capabilities (e.g. %NETIF_F_TSO) |
| * @sk_route_nocaps: forbidden route capabilities (e.g NETIF_F_GSO_MASK) |
| * @sk_gso_type: GSO type (e.g. %SKB_GSO_TCPV4) |
| * @sk_gso_max_size: Maximum GSO segment size to build |
| * @sk_gso_max_segs: Maximum number of GSO segments |
| * @sk_lingertime: %SO_LINGER l_linger setting |
| * @sk_backlog: always used with the per-socket spinlock held |
| * @sk_callback_lock: used with the callbacks in the end of this struct |
| * @sk_error_queue: rarely used |
| * @sk_prot_creator: sk_prot of original sock creator (see ipv6_setsockopt, |
| * IPV6_ADDRFORM for instance) |
| * @sk_err: last error |
| * @sk_err_soft: errors that don't cause failure but are the cause of a |
| * persistent failure not just 'timed out' |
| * @sk_drops: raw/udp drops counter |
| * @sk_ack_backlog: current listen backlog |
| * @sk_max_ack_backlog: listen backlog set in listen() |
| * @sk_priority: %SO_PRIORITY setting |
| * @sk_cgrp_prioidx: socket group's priority map index |
| * @sk_type: socket type (%SOCK_STREAM, etc) |
| * @sk_protocol: which protocol this socket belongs in this network family |
| * @sk_peer_pid: &struct pid for this socket's peer |
| * @sk_peer_cred: %SO_PEERCRED setting |
| * @sk_rcvlowat: %SO_RCVLOWAT setting |
| * @sk_rcvtimeo: %SO_RCVTIMEO setting |
| * @sk_sndtimeo: %SO_SNDTIMEO setting |
| * @sk_rxhash: flow hash received from netif layer |
| * @sk_filter: socket filtering instructions |
| * @sk_protinfo: private area, net family specific, when not using slab |
| * @sk_timer: sock cleanup timer |
| * @sk_stamp: time stamp of last packet received |
| * @sk_socket: Identd and reporting IO signals |
| * @sk_user_data: RPC layer private data |
| * @sk_frag: cached page frag |
| * @sk_peek_off: current peek_offset value |
| * @sk_send_head: front of stuff to transmit |
| * @sk_security: used by security modules |
| * @sk_mark: generic packet mark |
| * @sk_classid: this socket's cgroup classid |
| * @sk_cgrp: this socket's cgroup-specific proto data |
| * @sk_write_pending: a write to stream socket waits to start |
| * @sk_state_change: callback to indicate change in the state of the sock |
| * @sk_data_ready: callback to indicate there is data to be processed |
| * @sk_write_space: callback to indicate there is bf sending space available |
| * @sk_error_report: callback to indicate errors (e.g. %MSG_ERRQUEUE) |
| * @sk_backlog_rcv: callback to process the backlog |
| * @sk_destruct: called at sock freeing time, i.e. when all refcnt == 0 |
| */ |
| struct sock { |
| /* |
| * Now struct inet_timewait_sock also uses sock_common, so please just |
| * don't add nothing before this first member (__sk_common) --acme |
| */ |
| 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_portpair __sk_common.skc_portpair |
| #define sk_num __sk_common.skc_num |
| #define sk_dport __sk_common.skc_dport |
| #define sk_addrpair __sk_common.skc_addrpair |
| #define sk_daddr __sk_common.skc_daddr |
| #define sk_rcv_saddr __sk_common.skc_rcv_saddr |
| #define sk_family __sk_common.skc_family |
| #define sk_state __sk_common.skc_state |
| #define sk_reuse __sk_common.skc_reuse |
| #define sk_reuseport __sk_common.skc_reuseport |
| #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 |
| #define sk_v6_daddr __sk_common.skc_v6_daddr |
| #define sk_v6_rcv_saddr __sk_common.skc_v6_rcv_saddr |
| |
| socket_lock_t sk_lock; |
| struct sk_buff_head sk_receive_queue; |
| /* |
| * The backlog queue is special, it is always used with |
| * the per-socket spinlock held and requires low latency |
| * access. Therefore we special case it's implementation. |
| * Note : rmem_alloc is in this structure to fill a hole |
| * on 64bit arches, not because its logically part of |
| * backlog. |
| */ |
| 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 |
| #ifdef CONFIG_NET_RX_BUSY_POLL |
| unsigned int sk_napi_id; |
| unsigned int sk_ll_usec; |
| #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_rx_dst; |
| struct dst_entry __rcu *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_tx : 1, |
| sk_no_check_rx : 1, |
| sk_userlocks : 4, |
| sk_protocol : 8, |
| sk_type : 16; |
| kmemcheck_bitfield_end(flags); |
| int sk_wmem_queued; |
| gfp_t sk_allocation; |
| u32 sk_pacing_rate; /* bytes per second */ |
| u32 sk_max_pacing_rate; |
| netdev_features_t sk_route_caps; |
| netdev_features_t sk_route_nocaps; |
| int sk_gso_type; |
| unsigned int sk_gso_max_size; |
| u16 sk_gso_max_segs; |
| 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; |
| #if IS_ENABLED(CONFIG_CGROUP_NET_PRIO) |
| __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_frag sk_frag; |
| struct sk_buff *sk_send_head; |
| __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); |
| 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); |
| }; |
| |
| #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 |
| |
| 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; |
| } |
| |
| /* |
| * 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 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 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 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 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); |
| 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, 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) |
| |
| 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_TX_HARDWARE, /* %SOF_TIMESTAMPING_TX_HARDWARE */ |
| SOCK_TIMESTAMPING_TX_SOFTWARE, /* %SOF_TIMESTAMPING_TX_SOFTWARE */ |
| SOCK_TIMESTAMPING_RX_HARDWARE, /* %SOF_TIMESTAMPING_RX_HARDWARE */ |
| SOCK_TIMESTAMPING_RX_SOFTWARE, /* %SOF_TIMESTAMPING_RX_SOFTWARE */ |
| SOCK_TIMESTAMPING_SOFTWARE, /* %SOF_TIMESTAMPING_SOFTWARE */ |
| SOCK_TIMESTAMPING_RAW_HARDWARE, /* %SOF_TIMESTAMPING_RAW_HARDWARE */ |
| SOCK_TIMESTAMPING_SYS_HARDWARE, /* %SOF_TIMESTAMPING_SYS_HARDWARE */ |
| 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 */ |
| }; |
| |
| 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_atomic(struct sock *sk, gfp_t gfp_mask) |
| { |
| return GFP_ATOMIC | (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(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, const struct sk_buff *skb, |
| 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, skb, limit)) |
| return -ENOBUFS; |
| |
| __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 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_reset_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_reset_sock_flow(sock_flow_table, hash); |
| rcu_read_unlock(); |
| #endif |
| } |
| |
| static inline void sock_rps_record_flow(const struct sock *sk) |
| { |
| #ifdef CONFIG_RPS |
| sock_rps_record_flow_hash(sk->sk_rxhash); |
| #endif |
| } |
| |
| static inline void sock_rps_reset_flow(const struct sock *sk) |
| { |
| #ifdef CONFIG_RPS |
| sock_rps_reset_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)) { |
| sock_rps_reset_flow(sk); |
| sk->sk_rxhash = skb->hash; |
| } |
| #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; \ |
| }) |
| |
| 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); |
| |
| 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; |
| |
| /* |
| * 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 |
| * transport -> network interface is defined by struct inet_proto |
| */ |
| struct proto { |
| void (*close)(struct sock *sk, |
| long timeout); |
| int (*connect)(struct sock *sk, |
| struct sockaddr *uaddr, |
| int addr_len); |
| int (*disconnect)(struct sock *sk, int flags); |
| |
| struct sock * (*accept)(struct sock *sk, int flags, int *err); |
| |
| int (*ioctl)(struct sock *sk, int cmd, |
| unsigned long arg); |
| int (*init)(struct sock *sk); |
| 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 (*release_cb)(struct sock *sk); |
| void (*mtu_reduced)(struct sock *sk); |
| |
| /* Keeping track of sk's, looking them up, and port selection methods. */ |
| 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); |
| |
| /* 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; |
| } h; |
| |
| struct module *owner; |
| |
| char name[32]; |
| |
| struct list_head node; |
| #ifdef SOCK_REFCNT_DEBUG |
| atomic_t socks; |
| #endif |
| #ifdef CONFIG_MEMCG_KMEM |
| /* |
| * cgroup specific init/deinit functions. Called once for all |
| * protocols that implement it, from cgroups populate function. |
| * This function has to setup any files the protocol want to |
| * appear in the kmem cgroup filesystem. |
| */ |
| int (*init_cgroup)(struct mem_cgroup *memcg, |
| struct cgroup_subsys *ss); |
| void (*destroy_cgroup)(struct mem_cgroup *memcg); |
| struct cg_proto *(*proto_cgroup)(struct mem_cgroup *memcg); |
| #endif |
| }; |
| |
| /* |
| * Bits in struct cg_proto.flags |
| */ |
| enum cg_proto_flags { |
| /* Currently active and new sockets should be assigned to cgroups */ |
| MEMCG_SOCK_ACTIVE, |
| /* It was ever activated; we must disarm static keys on destruction */ |
| MEMCG_SOCK_ACTIVATED, |
| }; |
| |
| struct cg_proto { |
| struct res_counter memory_allocated; /* Current allocated memory. */ |
| struct percpu_counter sockets_allocated; /* Current number of sockets. */ |
| int memory_pressure; |
| long sysctl_mem[3]; |
| unsigned long flags; |
| /* |
| * memcg field is used to find which memcg we belong directly |
| * Each memcg struct can hold more than one cg_proto, so container_of |
| * won't really cut. |
| * |
| * The elegant solution would be having an inverse function to |
| * proto_cgroup in struct proto, but that means polluting the structure |
| * for everybody, instead of just for memcg users. |
| */ |
| struct mem_cgroup *memcg; |
| }; |
| |
| int proto_register(struct proto *prot, int alloc_slab); |
| void proto_unregister(struct proto *prot); |
| |
| static inline bool memcg_proto_active(struct cg_proto *cg_proto) |
| { |
| return test_bit(MEMCG_SOCK_ACTIVE, &cg_proto->flags); |
| } |
| |
| static inline bool memcg_proto_activated(struct cg_proto *cg_proto) |
| { |
| return test_bit(MEMCG_SOCK_ACTIVATED, &cg_proto->flags); |
| } |
| |
| #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 */ |
| |
| #if defined(CONFIG_MEMCG_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_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 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)) |
| 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->memory_pressure = 1; |
| } |
| |
| 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); |
| /* update the root cgroup regardless */ |
| 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 |
| /* 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 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); |
| |
| /* About 10 seconds */ |
| #define SOCK_DESTROY_TIME (10*HZ) |
| |
| /* Sockets 0-1023 can't be bound to unless you are superuser */ |
| #define PROT_SOCK 1024 |
| |
| #define SHUTDOWN_MASK 3 |
| #define RCV_SHUTDOWN 1 |
| #define SEND_SHUTDOWN 2 |
| |
| #define SOCK_SNDBUF_LOCK 1 |
| #define SOCK_RCVBUF_LOCK 2 |
| #define SOCK_BINDADDR_LOCK 4 |
| #define SOCK_BINDPORT_LOCK 8 |
| |
| /* sock_iocb: used to kick off async processing of socket ios */ |
| struct sock_iocb { |
| struct list_head list; |
| |
| int flags; |
| int size; |
| struct socket *sock; |
| struct sock *sk; |
| struct scm_cookie *scm; |
| struct msghdr *msg, async_msg; |
| struct kiocb *kiocb; |
| }; |
| |
| static inline struct sock_iocb *kiocb_to_siocb(struct kiocb *iocb) |
| { |
| return (struct sock_iocb *)iocb->private; |
| } |
| |
| static inline struct kiocb *siocb_to_kiocb(struct sock_iocb *si) |
| { |
| return si->kiocb; |
| } |
| |
| struct socket_alloc { |
| struct socket socket; |
| struct inode vfs_inode; |
| }; |
| |
| static inline struct socket *SOCKET_I(struct inode *inode) |
| { |
| return &container_of(inode, struct socket_alloc, vfs_inode)->socket; |
| } |
| |
| static inline struct inode *SOCK_INODE(struct socket *socket) |
| { |
| return &container_of(socket, struct socket_alloc, socket)->vfs_inode; |
| } |
| |
| /* |
| * Functions for memory accounting |
| */ |
| int __sk_mem_schedule(struct sock *sk, int size, int kind); |
| 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 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); |
| } |
| |
| 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); |
| } |
| |
| /* Used by processes to "lock" a socket state, so that |
| * interrupts and bottom half handlers won't change it |
| * from under us. It essentially blocks any incoming |
| * packets, so that we won't get any new data or any |
| * packets that change the state of the socket. |
| * |
| * While locked, BH processing will add new packets to |
| * the backlog queue. This queue is processed by the |
| * owner of the socket lock right before it is released. |
| * |
| * Since ~2.3.5 it is also exclusive sleep lock serializing |
| * accesses from user process context. |
| */ |
| #define sock_owned_by_user(sk) ((sk)->sk_lock.owned) |
| |
| static inline void sock_release_ownership(struct sock *sk) |
| { |
| sk->sk_lock.owned = 0; |
| } |
| |
| /* |
| * 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) |
| |
| 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); |
| } |
| |
| |
| struct sock *sk_alloc(struct net *net, int family, gfp_t priority, |
| struct proto *prot); |
| void sk_free(struct sock *sk); |
| void sk_release_kernel(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 skb_orphan_partial(struct sk_buff *skb); |
| void sock_rfree(struct sk_buff *skb); |
| void sock_edemux(struct sk_buff *skb); |
| |
| 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 sk_send_sigurg(struct sock *sk); |
| |
| /* |
| * 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 kiocb *, struct socket *, struct msghdr *, size_t); |
| int sock_no_recvmsg(struct kiocb *, 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 kiocb *iocb, 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, ESTABLISHED...) |
| */ |
| void sock_gen_put(struct sock *sk); |
| |
| 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; |
| } |
| /* 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); |
| 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 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 && !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); |
| |
| 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(&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); |
| |
| 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 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; |
| } |
| |
| /** |
| * 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); |
| } |
| |
| /** |
| * wq_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 wq_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 wq_has_sleeper(struct socket_wq *wq) |
| { |
| /* We need to be sure we are in sync with the |
| * add_wait_queue modifications to the wait queue. |
| * |
| * This memory barrier is paired in the sock_poll_wait. |
| */ |
| smp_mb(); |
| return wq && waitqueue_active(&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(); |
| } |
| } |
| |
| /* |
| * Queue a received datagram if it will fit. Stream and sequenced |
| * protocols can't normally use this as they need to fit buffers in |
| * and play with them. |
| * |
| * Inlined as it's very short and called for pretty much every |
| * packet ever received. |
| */ |
| |
| static inline void skb_set_owner_w(struct sk_buff *skb, struct sock *sk) |
| { |
| skb_orphan(skb); |
| skb->sk = sk; |
| skb->destructor = sock_wfree; |
| /* |
| * We used to take a refcount on sk, but following operation |
| * is enough to guarantee sk_free() wont free this sock until |
| * all in-flight packets are completed |
| */ |
| 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); |
| } |
| |
| 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 sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb); |
| |
| int sock_queue_err_skb(struct sock *sk, struct sk_buff *skb); |
| |
| /* |
| * Recover an error report and clear atomically |
| */ |
| |
| static inline int sock_error(struct sock *sk) |
| { |
| int err; |
| if (likely(!sk->sk_err)) |
| return 0; |
| err = xchg(&sk->sk_err, 0); |
| return -err; |
| } |
| |
| static inline unsigned long sock_wspace(struct sock *sk) |
| { |
| int amt = 0; |
| |
| if (!(sk->sk_shutdown & SEND_SHUTDOWN)) { |
| amt = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc); |
| if (amt < 0) |
| amt = 0; |
| } |
| return amt; |
| } |
| |
| static inline void sk_wake_async(struct sock *sk, int how, int band) |
| { |
| if (sock_flag(sk, SOCK_FASYNC)) |
| sock_wake_async(sk->sk_socket, how, band); |
| } |
| |
| /* 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); |
| |
| /** |
| * 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 (sk->sk_allocation & __GFP_WAIT) |
| 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; |
| } |
| |
| 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 (SOCK_RCVTSTAMP |
| * or SOCK_TIMESTAMPING_RX_SOFTWARE) |
| * - software time stamp available and wanted |
| * (SOCK_TIMESTAMPING_SOFTWARE) |
| * - hardware time stamps available and wanted |
| * (SOCK_TIMESTAMPING_SYS_HARDWARE or |
| * SOCK_TIMESTAMPING_RAW_HARDWARE) |
| */ |
| 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); |
| } |
| |
| 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_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; |
| } |
| |
| /** |
| * sock_tx_timestamp - checks whether the outgoing packet is to be time stamped |
| * @sk: socket sending this packet |
| * @tx_flags: filled with instructions for time stamping |
| * |
| * Currently only depends on SOCK_TIMESTAMPING* flags. |
| */ |
| void sock_tx_timestamp(struct sock *sk, __u8 *tx_flags); |
| |
| /** |
| * sk_eat_skb - Release a skb if it is no longer needed |
| * @sk: socket to eat this skb from |
| * @skb: socket buffer to eat |
| * @copied_early: flag indicating whether DMA operations copied this data early |
| * |
| * This routine must be called with interrupts disabled or with the socket |
| * locked so that the sk_buff queue operation is ok. |
| */ |
| #ifdef CONFIG_NET_DMA |
| static inline void sk_eat_skb(struct sock *sk, struct sk_buff *skb, bool 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, bool 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); |
| } |
| |
| /* |
| * Kernel sockets, f.e. rtnl or icmp_socket, are a part of a namespace. |
| * They should not hold a reference to a namespace in order to allow |
| * to stop it. |
| * Sockets after sk_change_net should be released using sk_release_kernel |
| */ |
| static inline void sk_change_net(struct sock *sk, struct net *net) |
| { |
| struct net *current_net = sock_net(sk); |
| |
| if (!net_eq(current_net, net)) { |
| put_net(current_net); |
| sock_net_set(sk, hold_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; |
| } |
| |
| 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); |
| |
| /* |
| * Enable debug/info messages |
| */ |
| extern int net_msg_warn; |
| #define NETDEBUG(fmt, args...) \ |
| do { if (net_msg_warn) printk(fmt,##args); } while (0) |
| |
| #define LIMIT_NETDEBUG(fmt, args...) \ |
| do { if (net_msg_warn && net_ratelimit()) printk(fmt,##args); } while(0) |
| |
| extern __u32 sysctl_wmem_max; |
| extern __u32 sysctl_rmem_max; |
| |
| extern int sysctl_optmem_max; |
| |
| extern __u32 sysctl_wmem_default; |
| extern __u32 sysctl_rmem_default; |
| |
| #endif /* _SOCK_H */ |