| 1 |
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| 2 | |
| 3 | * INET An implementation of the TCP/IP protocol suite for the LINUX
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| 4 | * operating system. INET is implemented using the BSD Socket
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| 5 | * interface as the means of communication with the user level.
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| 6 | *
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| 7 | * Definitions for the AF_INET socket handler.
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| 8 | *
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| 9 | * Version: @(#)sock.h 1.0.4 05/13/93
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| 10 | *
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| 11 | * Authors: Ross Biro
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| 12 | * Fred N. van Kempen, <[email protected]>
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| 13 | * Corey Minyard <[email protected]>
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| 14 | * Florian La Roche <[email protected]>
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| 15 | *
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| 16 | * Fixes:
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| 17 | * Alan Cox : Volatiles in skbuff pointers. See
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| 18 | * skbuff comments. May be overdone,
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| 19 | * better to prove they can be removed
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| 20 | * than the reverse.
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| 21 | * Alan Cox : Added a zapped field for tcp to note
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| 22 | * a socket is reset and must stay shut up
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| 23 | * Alan Cox : New fields for options
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| 24 | * Pauline Middelink : identd support
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| 25 | * Alan Cox : Eliminate low level recv/recvfrom
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| 26 | * David S. Miller : New socket lookup architecture.
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| 27 | * Steve Whitehouse: Default routines for sock_ops
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| 28 | * Arnaldo C. Melo : removed net_pinfo, tp_pinfo and made
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| 29 | * protinfo be just a void pointer, as the
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| 30 | * protocol specific parts were moved to
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| 31 | * respective headers and ipv4/v6, etc now
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| 32 | * use private slabcaches for its socks
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| 33 | * Pedro Hortas : New flags field for socket options
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| 34 |
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| 35 | #ifndef _SOCK_H
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| 36 | #define _SOCK_H
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| 37 |
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| 38 | #include <linux/hardirq.h>
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| 39 | #include <linux/kernel.h>
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| 40 | #include <linux/list.h>
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| 41 | #include <linux/list_nulls.h>
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| 42 | #include <linux/timer.h>
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| 43 | #include <linux/cache.h>
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| 44 | #include <linux/bitops.h>
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| 45 | #include <linux/lockdep.h>
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| 46 | #include <linux/netdevice.h>
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| 47 | #include <linux/skbuff.h>
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| 48 | #include <linux/mm.h>
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| 49 | #include <linux/security.h>
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| 50 | #include <linux/slab.h>
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| 51 | #include <linux/uaccess.h>
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| 52 | #include <linux/page_counter.h>
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| 53 | #include <linux/memcontrol.h>
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| 54 | #include <linux/static_key.h>
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| 55 | #include <linux/sched.h>
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| 56 | #include <linux/wait.h>
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| 57 | #include <linux/cgroup-defs.h>
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| 58 | #include <linux/rbtree.h>
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| 59 | #include <linux/rculist_nulls.h>
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| 60 | #include <linux/poll.h>
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| 61 | #include <linux/sockptr.h>
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| 62 | #include <linux/indirect_call_wrapper.h>
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| 63 | #include <linux/atomic.h>
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| 64 | #include <linux/refcount.h>
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| 65 | #include <linux/llist.h>
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| 66 | #include <net/dst.h>
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| 67 | #include <net/checksum.h>
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| 68 | #include <net/tcp_states.h>
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| 69 | #include <linux/net_tstamp.h>
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| 70 | #include <net/l3mdev.h>
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| 71 | #include <uapi/linux/socket.h>
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| 72 |
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| 73 | |
| 74 | * This structure really needs to be cleaned up.
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| 75 | * Most of it is for TCP, and not used by any of
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| 76 | * the other protocols.
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| 77 |
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| 78 |
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| 79 | |
| 80 | * between user contexts and software interrupt processing, whereas the
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| 81 | * mini-semaphore synchronizes multiple users amongst themselves.
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| 82 |
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| 83 | typedef struct {
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| 84 | union {
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| 85 | struct slock_owned {
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| 86 | int owned;
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| 87 | spinlock_t slock;
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| 88 | };
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| 89 | long combined;
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| 90 | };
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| 91 | wait_queue_head_t wq;
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| 92 | |
| 93 | * We express the mutex-alike socket_lock semantics
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| 94 | * to the lock validator by explicitly managing
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| 95 | * the slock as a lock variant (in addition to
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| 96 | * the slock itself):
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| 97 |
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| 98 | #ifdef CONFIG_DEBUG_LOCK_ALLOC
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| 99 | struct lockdep_map dep_map;
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| 100 | #endif
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| 101 | } socket_lock_t;
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| 102 |
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| 103 | struct sock;
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| 104 | struct proto;
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| 105 | struct net;
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| 106 |
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| 107 | typedef __u32 __bitwise __portpair;
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| 108 | typedef __u64 __bitwise __addrpair;
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| 109 |
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| 110 | |
| 111 | * struct sock_common - minimal network layer representation of sockets
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| 112 | * @skc_daddr: Foreign IPv4 addr
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| 113 | * @skc_rcv_saddr: Bound local IPv4 addr
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| 114 | * @skc_addrpair: 8-byte-aligned __u64 union of @skc_daddr & @skc_rcv_saddr
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| 115 | * @skc_hash: hash value used with various protocol lookup tables
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| 116 | * @skc_u16hashes: two u16 hash values used by UDP lookup tables
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| 117 | * @skc_dport: placeholder for inet_dport/tw_dport
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| 118 | * @skc_num: placeholder for inet_num/tw_num
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| 119 | * @skc_portpair: __u32 union of @skc_dport & @skc_num
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| 120 | * @skc_family: network address family
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| 121 | * @skc_state: Connection state
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| 122 | * @skc_reuse: %SO_REUSEADDR setting
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| 123 | * @skc_reuseport: %SO_REUSEPORT setting
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| 124 | * @skc_ipv6only: socket is IPV6 only
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| 125 | * @skc_net_refcnt: socket is using net ref counting
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| 126 | * @skc_bypass_prot_mem: bypass the per-protocol memory accounting for skb
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| 127 | * @skc_bound_dev_if: bound device index if != 0
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| 128 | * @skc_bind_node: bind hash linkage for various protocol lookup tables
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| 129 | * @skc_portaddr_node: second hash linkage for UDP
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| 130 | * @skc_prot: protocol handlers inside a network family
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| 131 | * @skc_net: reference to the network namespace of this socket
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| 132 | * @skc_v6_daddr: IPV6 destination address
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| 133 | * @skc_v6_rcv_saddr: IPV6 source address
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| 134 | * @skc_cookie: socket's cookie value
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| 135 | * @skc_node: main hash linkage for various protocol lookup tables
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| 136 | * @skc_nulls_node: main hash linkage for TCP
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| 137 | * @skc_tx_queue_mapping: tx queue number for this connection
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| 138 | * @skc_rx_queue_mapping: rx queue number for this connection
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| 139 | * @skc_flags: place holder for sk_flags
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| 140 | * %SO_LINGER (l_onoff), %SO_BROADCAST, %SO_KEEPALIVE,
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| 141 | * %SO_OOBINLINE settings, %SO_TIMESTAMPING settings
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| 142 | * @skc_listener: connection request listener socket (aka rsk_listener)
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| 143 | * [union with @skc_flags]
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| 144 | * @skc_tw_dr: (aka tw_dr) ptr to &struct inet_timewait_death_row
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| 145 | * [union with @skc_flags]
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| 146 | * @skc_incoming_cpu: record/match cpu processing incoming packets
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| 147 | * @skc_rcv_wnd: (aka rsk_rcv_wnd) TCP receive window size (possibly scaled)
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| 148 | * [union with @skc_incoming_cpu]
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| 149 | * @skc_tw_rcv_nxt: (aka tw_rcv_nxt) TCP window next expected seq number
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| 150 | * [union with @skc_incoming_cpu]
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| 151 | * @skc_refcnt: reference count
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| 152 | *
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| 153 | * This is the minimal network layer representation of sockets, the header
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| 154 | * for struct sock and struct inet_timewait_sock.
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| 155 |
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| 156 | struct sock_common {
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| 157 | union {
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| 158 | __addrpair skc_addrpair;
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| 159 | struct {
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| 160 | __be32 skc_daddr;
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| 161 | __be32 skc_rcv_saddr;
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| 162 | };
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| 163 | };
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| 164 | union {
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| 165 | unsigned int skc_hash;
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| 166 | __u16 skc_u16hashes[2];
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| 167 | };
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| 168 |
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| 169 | union {
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| 170 | __portpair skc_portpair;
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| 171 | struct {
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| 172 | __be16 skc_dport;
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| 173 | __u16 skc_num;
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| 174 | };
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| 175 | };
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| 176 |
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| 177 | unsigned short skc_family;
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| 178 | volatile unsigned char skc_state;
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| 179 | unsigned char skc_reuse:4;
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| 180 | unsigned char skc_reuseport:1;
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| 181 | unsigned char skc_ipv6only:1;
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| 182 | unsigned char skc_net_refcnt:1;
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| 183 | unsigned char skc_bypass_prot_mem:1;
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| 184 | int skc_bound_dev_if;
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| 185 | union {
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| 186 | struct hlist_node skc_bind_node;
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| 187 | struct hlist_node skc_portaddr_node;
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| 188 | };
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| 189 | struct proto *skc_prot;
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| 190 | possible_net_t skc_net;
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| 191 |
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| 192 | #if IS_ENABLED(CONFIG_IPV6)
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| 193 | struct in6_addr skc_v6_daddr;
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| 194 | struct in6_addr skc_v6_rcv_saddr;
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| 195 | #endif
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| 196 |
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| 197 | atomic64_t skc_cookie;
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| 198 |
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| 199 | |
| 200 | * offset(struct sock, sk_refcnt) == 128 on 64bit arches
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| 201 | * assuming IPV6 is enabled. We use this padding differently
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| 202 | * for different kind of 'sockets'
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| 203 |
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| 204 | union {
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| 205 | unsigned long skc_flags;
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| 206 | struct sock *skc_listener;
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| 207 | struct inet_timewait_death_row *skc_tw_dr;
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| 208 | };
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| 209 | |
| 210 | * fields between dontcopy_begin/dontcopy_end
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| 211 | * are not copied in sock_copy()
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| 212 |
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| 213 |
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| 214 | int skc_dontcopy_begin[0];
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| 215 |
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| 216 | union {
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| 217 | struct hlist_node skc_node;
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| 218 | struct hlist_nulls_node skc_nulls_node;
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| 219 | };
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| 220 | unsigned short skc_tx_queue_mapping;
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| 221 | #ifdef CONFIG_SOCK_RX_QUEUE_MAPPING
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| 222 | unsigned short skc_rx_queue_mapping;
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| 223 | #endif
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| 224 | union {
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| 225 | int skc_incoming_cpu;
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| 226 | u32 skc_rcv_wnd;
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| 227 | u32 skc_tw_rcv_nxt;
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| 228 | };
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| 229 |
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| 230 | refcount_t skc_refcnt;
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| 231 |
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| 232 | int skc_dontcopy_end[0];
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| 233 | union {
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| 234 | u32 skc_rxhash;
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| 235 | u32 skc_window_clamp;
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| 236 | u32 skc_tw_snd_nxt;
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| 237 | };
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| 238 |
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| 239 | };
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| 240 |
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| 241 | struct bpf_local_storage;
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| 242 | struct sk_filter;
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| 243 |
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| 244 | |
| 245 | * struct sock - network layer representation of sockets
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| 246 | * @__sk_common: shared layout with inet_timewait_sock
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| 247 | * @sk_shutdown: mask of %SEND_SHUTDOWN and/or %RCV_SHUTDOWN
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| 248 | * @sk_userlocks: %SO_SNDBUF and %SO_RCVBUF settings
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| 249 | * @sk_lock: synchronizer
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| 250 | * @sk_kern_sock: True if sock is using kernel lock classes
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| 251 | * @sk_rcvbuf: size of receive buffer in bytes
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| 252 | * @sk_wq: sock wait queue and async head
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| 253 | * @sk_rx_dst: receive input route used by early demux
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| 254 | * @sk_rx_dst_ifindex: ifindex for @sk_rx_dst
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| 255 | * @sk_rx_dst_cookie: cookie for @sk_rx_dst
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| 256 | * @sk_dst_cache: destination cache
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| 257 | * @sk_dst_pending_confirm: need to confirm neighbour
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| 258 | * @sk_policy: flow policy
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| 259 | * @psp_assoc: PSP association, if socket is PSP-secured
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| 260 | * @sk_receive_queue: incoming packets
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| 261 | * @sk_wmem_alloc: transmit queue bytes committed
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| 262 | * @sk_tsq_flags: TCP Small Queues flags
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| 263 | * @sk_write_queue: Packet sending queue
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| 264 | * @sk_omem_alloc: "o" is "option" or "other"
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| 265 | * @sk_wmem_queued: persistent queue size
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| 266 | * @sk_forward_alloc: space allocated forward
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| 267 | * @sk_reserved_mem: space reserved and non-reclaimable for the socket
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| 268 | * @sk_napi_id: id of the last napi context to receive data for sk
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| 269 | * @sk_ll_usec: usecs to busypoll when there is no data
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| 270 | * @sk_allocation: allocation mode
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| 271 | * @sk_pacing_rate: Pacing rate (if supported by transport/packet scheduler)
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| 272 | * @sk_pacing_status: Pacing status (requested, handled by sch_fq)
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| 273 | * @sk_max_pacing_rate: Maximum pacing rate (%SO_MAX_PACING_RATE)
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| 274 | * @sk_sndbuf: size of send buffer in bytes
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| 275 | * @sk_no_check_tx: %SO_NO_CHECK setting, set checksum in TX packets
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| 276 | * @sk_no_check_rx: allow zero checksum in RX packets
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| 277 | * @sk_route_caps: route capabilities (e.g. %NETIF_F_TSO)
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| 278 | * @sk_gso_disabled: if set, NETIF_F_GSO_MASK is forbidden.
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| 279 | * @sk_gso_type: GSO type (e.g. %SKB_GSO_TCPV4)
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| 280 | * @sk_gso_max_size: Maximum GSO segment size to build
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| 281 | * @sk_gso_max_segs: Maximum number of GSO segments
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| 282 | * @sk_pacing_shift: scaling factor for TCP Small Queues
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| 283 | * @sk_lingertime: %SO_LINGER l_linger setting
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| 284 | * @sk_backlog: always used with the per-socket spinlock held
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| 285 | * @sk_callback_lock: used with the callbacks in the end of this struct
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| 286 | * @sk_error_queue: rarely used
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| 287 | * @sk_prot_creator: sk_prot of original sock creator (see ipv6_setsockopt,
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| 288 | * IPV6_ADDRFORM for instance)
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| 289 | * @sk_err: last error
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| 290 | * @sk_err_soft: errors that don't cause failure but are the cause of a
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| 291 | * persistent failure not just 'timed out'
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| 292 | * @sk_drops: raw/udp drops counter
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| 293 | * @sk_drop_counters: optional pointer to numa_drop_counters
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| 294 | * @sk_ack_backlog: current listen backlog
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| 295 | * @sk_max_ack_backlog: listen backlog set in listen()
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| 296 | * @sk_uid: user id of owner
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| 297 | * @sk_ino: inode number (zero if orphaned)
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| 298 | * @sk_prefer_busy_poll: prefer busypolling over softirq processing
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| 299 | * @sk_busy_poll_budget: napi processing budget when busypolling
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| 300 | * @sk_priority: %SO_PRIORITY setting
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| 301 | * @sk_type: socket type (%SOCK_STREAM, etc)
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| 302 | * @sk_protocol: which protocol this socket belongs in this network family
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| 303 | * @sk_peer_lock: lock protecting @sk_peer_pid and @sk_peer_cred
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| 304 | * @sk_peer_pid: &struct pid for this socket's peer
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| 305 | * @sk_peer_cred: %SO_PEERCRED setting
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| 306 | * @sk_rcvlowat: %SO_RCVLOWAT setting
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| 307 | * @sk_rcvtimeo: %SO_RCVTIMEO setting
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| 308 | * @sk_sndtimeo: %SO_SNDTIMEO setting
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| 309 | * @sk_txhash: computed flow hash for use on transmit
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| 310 | * @sk_txrehash: enable TX hash rethink
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| 311 | * @sk_filter: socket filtering instructions
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| 312 | * @sk_timer: sock cleanup timer
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| 313 | * @tcp_retransmit_timer: tcp retransmit timer
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| 314 | * @mptcp_retransmit_timer: mptcp retransmit timer
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| 315 | * @sk_stamp: time stamp of last packet received
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| 316 | * @sk_stamp_seq: lock for accessing sk_stamp on 32 bit architectures only
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| 317 | * @sk_tsflags: SO_TIMESTAMPING flags
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| 318 | * @sk_bpf_cb_flags: used in bpf_setsockopt()
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| 319 | * @sk_use_task_frag: allow sk_page_frag() to use current->task_frag.
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| 320 | * Sockets that can be used under memory reclaim should
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| 321 | * set this to false.
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| 322 | * @sk_bind_phc: SO_TIMESTAMPING bind PHC index of PTP virtual clock
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| 323 | * for timestamping
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| 324 | * @sk_tskey: counter to disambiguate concurrent tstamp requests
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| 325 | * @sk_tx_queue_mapping_jiffies: time in jiffies of last @sk_tx_queue_mapping refresh.
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| 326 | * @sk_zckey: counter to order MSG_ZEROCOPY notifications
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| 327 | * @sk_socket: Identd and reporting IO signals
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| 328 | * @sk_user_data: RPC layer private data. Write-protected by @sk_callback_lock.
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| 329 | * @sk_frag: cached page frag
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| 330 | * @sk_peek_off: current peek_offset value
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| 331 | * @sk_send_head: front of stuff to transmit
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| 332 | * @tcp_rtx_queue: TCP re-transmit queue [union with @sk_send_head]
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| 333 | * @sk_security: used by security modules
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| 334 | * @sk_mark: generic packet mark
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| 335 | * @sk_cgrp_data: cgroup data for this cgroup
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| 336 | * @sk_memcg: this socket's memory cgroup association
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| 337 | * @sk_write_pending: a write to stream socket waits to start
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| 338 | * @sk_disconnects: number of disconnect operations performed on this sock
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| 339 | * @sk_state_change: callback to indicate change in the state of the sock
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| 340 | * @sk_data_ready: callback to indicate there is data to be processed
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| 341 | * @sk_write_space: callback to indicate there is bf sending space available
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| 342 | * @sk_error_report: callback to indicate errors (e.g. %MSG_ERRQUEUE)
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| 343 | * @sk_backlog_rcv: callback to process the backlog
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| 344 | * @sk_validate_xmit_skb: ptr to an optional validate function
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| 345 | * @sk_destruct: called at sock freeing time, i.e. when all refcnt == 0
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| 346 | * @sk_reuseport_cb: reuseport group container
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| 347 | * @sk_bpf_storage: ptr to cache and control for bpf_sk_storage
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| 348 | * @sk_rcu: used during RCU grace period
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| 349 | * @sk_freeptr: used for SLAB_TYPESAFE_BY_RCU managed sockets
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| 350 | * @sk_clockid: clockid used by time-based scheduling (SO_TXTIME)
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| 351 | * @sk_txtime_deadline_mode: set deadline mode for SO_TXTIME
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| 352 | * @sk_txtime_report_errors: set report errors mode for SO_TXTIME
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| 353 | * @sk_txtime_unused: unused txtime flags
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| 354 | * @sk_scm_recv_flags: all flags used by scm_recv()
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| 355 | * @sk_scm_credentials: flagged by SO_PASSCRED to recv SCM_CREDENTIALS
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| 356 | * @sk_scm_security: flagged by SO_PASSSEC to recv SCM_SECURITY
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| 357 | * @sk_scm_pidfd: flagged by SO_PASSPIDFD to recv SCM_PIDFD
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| 358 | * @sk_scm_rights: flagged by SO_PASSRIGHTS to recv SCM_RIGHTS
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| 359 | * @sk_scm_unused: unused flags for scm_recv()
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| 360 | * @ns_tracker: tracker for netns reference
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| 361 | * @sk_user_frags: xarray of pages the user is holding a reference on.
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| 362 | * @sk_owner: reference to the real owner of the socket that calls
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| 363 | * sock_lock_init_class_and_name().
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| 364 |
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| 365 | struct sock {
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| 366 | |
| 367 | * Now struct inet_timewait_sock also uses sock_common, so please just
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| 368 | * don't add nothing before this first member (__sk_common) --acme
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| 369 |
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| 370 | struct sock_common __sk_common;
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| 371 | #define sk_node __sk_common.skc_node
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| 372 | #define sk_nulls_node __sk_common.skc_nulls_node
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| 373 | #define sk_refcnt __sk_common.skc_refcnt
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| 374 | #define sk_tx_queue_mapping __sk_common.skc_tx_queue_mapping
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| 375 | #ifdef CONFIG_SOCK_RX_QUEUE_MAPPING
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| 376 | #define sk_rx_queue_mapping __sk_common.skc_rx_queue_mapping
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| 377 | #endif
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| 378 |
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| 379 | #define sk_dontcopy_begin __sk_common.skc_dontcopy_begin
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| 380 | #define sk_dontcopy_end __sk_common.skc_dontcopy_end
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| 381 | #define sk_hash __sk_common.skc_hash
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| 382 | #define sk_portpair __sk_common.skc_portpair
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| 383 | #define sk_num __sk_common.skc_num
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| 384 | #define sk_dport __sk_common.skc_dport
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| 385 | #define sk_addrpair __sk_common.skc_addrpair
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| 386 | #define sk_daddr __sk_common.skc_daddr
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| 387 | #define sk_rcv_saddr __sk_common.skc_rcv_saddr
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| 388 | #define sk_family __sk_common.skc_family
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| 389 | #define sk_state __sk_common.skc_state
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| 390 | #define sk_reuse __sk_common.skc_reuse
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| 391 | #define sk_reuseport __sk_common.skc_reuseport
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| 392 | #define sk_ipv6only __sk_common.skc_ipv6only
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| 393 | #define sk_net_refcnt __sk_common.skc_net_refcnt
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| 394 | #define sk_bypass_prot_mem __sk_common.skc_bypass_prot_mem
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| 395 | #define sk_bound_dev_if __sk_common.skc_bound_dev_if
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| 396 | #define sk_bind_node __sk_common.skc_bind_node
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| 397 | #define sk_prot __sk_common.skc_prot
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| 398 | #define sk_net __sk_common.skc_net
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| 399 | #define sk_v6_daddr __sk_common.skc_v6_daddr
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| 400 | #define sk_v6_rcv_saddr __sk_common.skc_v6_rcv_saddr
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| 401 | #define sk_cookie __sk_common.skc_cookie
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| 402 | #define sk_incoming_cpu __sk_common.skc_incoming_cpu
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| 403 | #define sk_flags __sk_common.skc_flags
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| 404 | #define sk_rxhash __sk_common.skc_rxhash
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| 405 |
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| 406 | __cacheline_group_begin(sock_write_rx);
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| 407 |
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| 408 | atomic_t sk_drops;
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| 409 | __s32 sk_peek_off;
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| 410 | struct sk_buff_head sk_error_queue;
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| 411 | struct sk_buff_head sk_receive_queue;
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| 412 | |
| 413 | * The backlog queue is special, it is always used with
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| 414 | * the per-socket spinlock held and requires low latency
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| 415 | * access. Therefore we special case it's implementation.
|
| 416 | * Note : rmem_alloc is in this structure to fill a hole
|
| 417 | * on 64bit arches, not because its logically part of
|
| 418 | * backlog.
|
| 419 |
|
| 420 | struct {
|
| 421 | atomic_t rmem_alloc;
|
| 422 | int len;
|
| 423 | struct sk_buff *head;
|
| 424 | struct sk_buff *tail;
|
| 425 | } sk_backlog;
|
| 426 | #define sk_rmem_alloc sk_backlog.rmem_alloc
|
| 427 |
|
| 428 | __cacheline_group_end(sock_write_rx);
|
| 429 |
|
| 430 | __cacheline_group_begin(sock_read_rx);
|
| 431 |
|
| 432 | struct dst_entry __rcu *sk_rx_dst;
|
| 433 | int sk_rx_dst_ifindex;
|
| 434 | u32 sk_rx_dst_cookie;
|
| 435 |
|
| 436 | #ifdef CONFIG_NET_RX_BUSY_POLL
|
| 437 | unsigned int sk_ll_usec;
|
| 438 | unsigned int sk_napi_id;
|
| 439 | u16 sk_busy_poll_budget;
|
| 440 | u8 sk_prefer_busy_poll;
|
| 441 | #endif
|
| 442 | u8 sk_userlocks;
|
| 443 | int sk_rcvbuf;
|
| 444 |
|
| 445 | struct sk_filter __rcu *sk_filter;
|
| 446 | union {
|
| 447 | struct socket_wq __rcu *sk_wq;
|
| 448 |
|
| 449 | struct socket_wq *sk_wq_raw;
|
| 450 |
|
| 451 | };
|
| 452 |
|
| 453 | void (*sk_data_ready)(struct sock *sk);
|
| 454 | long sk_rcvtimeo;
|
| 455 | int sk_rcvlowat;
|
| 456 | __cacheline_group_end(sock_read_rx);
|
| 457 |
|
| 458 | __cacheline_group_begin(sock_read_rxtx);
|
| 459 | int sk_err;
|
| 460 | struct socket *sk_socket;
|
| 461 | #ifdef CONFIG_MEMCG
|
| 462 | struct mem_cgroup *sk_memcg;
|
| 463 | #endif
|
| 464 | #ifdef CONFIG_XFRM
|
| 465 | struct xfrm_policy __rcu *sk_policy[2];
|
| 466 | #endif
|
| 467 | #if IS_ENABLED(CONFIG_INET_PSP)
|
| 468 | struct psp_assoc __rcu *psp_assoc;
|
| 469 | #endif
|
| 470 | __cacheline_group_end(sock_read_rxtx);
|
| 471 |
|
| 472 | __cacheline_group_begin(sock_write_rxtx);
|
| 473 | socket_lock_t sk_lock;
|
| 474 | u32 sk_reserved_mem;
|
| 475 | int sk_forward_alloc;
|
| 476 | u32 sk_tsflags;
|
| 477 | __cacheline_group_end(sock_write_rxtx);
|
| 478 |
|
| 479 | __cacheline_group_begin(sock_write_tx);
|
| 480 | int sk_write_pending;
|
| 481 | atomic_t sk_omem_alloc;
|
| 482 | int sk_err_soft;
|
| 483 |
|
| 484 | int sk_wmem_queued;
|
| 485 | refcount_t sk_wmem_alloc;
|
| 486 | unsigned long sk_tsq_flags;
|
| 487 | union {
|
| 488 | struct sk_buff *sk_send_head;
|
| 489 | struct rb_root tcp_rtx_queue;
|
| 490 | };
|
| 491 | struct sk_buff_head sk_write_queue;
|
| 492 | struct page_frag sk_frag;
|
| 493 | union {
|
| 494 | struct timer_list sk_timer;
|
| 495 | struct timer_list tcp_retransmit_timer;
|
| 496 | struct timer_list mptcp_retransmit_timer;
|
| 497 | };
|
| 498 | unsigned long sk_pacing_rate;
|
| 499 | atomic_t sk_zckey;
|
| 500 | atomic_t sk_tskey;
|
| 501 | unsigned long sk_tx_queue_mapping_jiffies;
|
| 502 | __cacheline_group_end(sock_write_tx);
|
| 503 |
|
| 504 | __cacheline_group_begin(sock_read_tx);
|
| 505 | u32 sk_dst_pending_confirm;
|
| 506 | u32 sk_pacing_status;
|
| 507 | unsigned long sk_max_pacing_rate;
|
| 508 | long sk_sndtimeo;
|
| 509 | u32 sk_priority;
|
| 510 | u32 sk_mark;
|
| 511 | kuid_t sk_uid;
|
| 512 | u16 sk_protocol;
|
| 513 | u16 sk_type;
|
| 514 | struct dst_entry __rcu *sk_dst_cache;
|
| 515 | netdev_features_t sk_route_caps;
|
| 516 | #ifdef CONFIG_SOCK_VALIDATE_XMIT
|
| 517 | struct sk_buff* (*sk_validate_xmit_skb)(struct sock *sk,
|
| 518 | struct net_device *dev,
|
| 519 | struct sk_buff *skb);
|
| 520 | #endif
|
| 521 | u16 sk_gso_type;
|
| 522 | u16 sk_gso_max_segs;
|
| 523 | unsigned int sk_gso_max_size;
|
| 524 | gfp_t sk_allocation;
|
| 525 | u32 sk_txhash;
|
| 526 | int sk_sndbuf;
|
| 527 | u8 sk_pacing_shift;
|
| 528 | bool sk_use_task_frag;
|
| 529 | __cacheline_group_end(sock_read_tx);
|
| 530 |
|
| 531 | |
| 532 | * Because of non atomicity rules, all
|
| 533 | * changes are protected by socket lock.
|
| 534 |
|
| 535 | u8 sk_gso_disabled : 1,
|
| 536 | sk_kern_sock : 1,
|
| 537 | sk_no_check_tx : 1,
|
| 538 | sk_no_check_rx : 1;
|
| 539 | u8 sk_shutdown;
|
| 540 | unsigned long sk_lingertime;
|
| 541 | struct proto *sk_prot_creator;
|
| 542 | rwlock_t sk_callback_lock;
|
| 543 | u32 sk_ack_backlog;
|
| 544 | u32 sk_max_ack_backlog;
|
| 545 | u64 sk_ino;
|
| 546 | spinlock_t sk_peer_lock;
|
| 547 | int sk_bind_phc;
|
| 548 | struct pid *sk_peer_pid;
|
| 549 | const struct cred *sk_peer_cred;
|
| 550 |
|
| 551 | ktime_t sk_stamp;
|
| 552 | #if BITS_PER_LONG==32
|
| 553 | seqlock_t sk_stamp_seq;
|
| 554 | #endif
|
| 555 | int sk_disconnects;
|
| 556 |
|
| 557 | union {
|
| 558 | u8 sk_txrehash;
|
| 559 | u8 sk_scm_recv_flags;
|
| 560 | struct {
|
| 561 | u8 sk_scm_credentials : 1,
|
| 562 | sk_scm_security : 1,
|
| 563 | sk_scm_pidfd : 1,
|
| 564 | sk_scm_rights : 1,
|
| 565 | sk_scm_unused : 4;
|
| 566 | };
|
| 567 | };
|
| 568 | u8 sk_clockid;
|
| 569 | u8 sk_txtime_deadline_mode : 1,
|
| 570 | sk_txtime_report_errors : 1,
|
| 571 | sk_txtime_unused : 6;
|
| 572 | #define SK_BPF_CB_FLAG_TEST(SK, FLAG) ((SK)->sk_bpf_cb_flags & (FLAG))
|
| 573 | u8 sk_bpf_cb_flags;
|
| 574 |
|
| 575 | void *sk_user_data;
|
| 576 | #ifdef CONFIG_SECURITY
|
| 577 | void *sk_security;
|
| 578 | #endif
|
| 579 | struct sock_cgroup_data sk_cgrp_data;
|
| 580 | void (*sk_state_change)(struct sock *sk);
|
| 581 | void (*sk_write_space)(struct sock *sk);
|
| 582 | void (*sk_error_report)(struct sock *sk);
|
| 583 | int (*sk_backlog_rcv)(struct sock *sk,
|
| 584 | struct sk_buff *skb);
|
| 585 | void (*sk_destruct)(struct sock *sk);
|
| 586 | struct sock_reuseport __rcu *sk_reuseport_cb;
|
| 587 | #ifdef CONFIG_BPF_SYSCALL
|
| 588 | struct bpf_local_storage __rcu *sk_bpf_storage;
|
| 589 | #endif
|
| 590 | struct numa_drop_counters *sk_drop_counters;
|
| 591 | |
| 592 | * By the time kfree() is called, sk_rcu can not be in
|
| 593 | * use and can be mangled.
|
| 594 |
|
| 595 | union {
|
| 596 | struct rcu_head sk_rcu;
|
| 597 | freeptr_t sk_freeptr;
|
| 598 | };
|
| 599 | netns_tracker ns_tracker;
|
| 600 | struct xarray sk_user_frags;
|
| 601 |
|
| 602 | #if IS_ENABLED(CONFIG_PROVE_LOCKING) && IS_ENABLED(CONFIG_MODULES)
|
| 603 | struct module *sk_owner;
|
| 604 | #endif
|
| 605 | };
|
| 606 |
|
| 607 | struct sock_bh_locked {
|
| 608 | struct sock *sock;
|
| 609 | local_lock_t bh_lock;
|
| 610 | };
|
| 611 |
|
| 612 | enum sk_pacing {
|
| 613 | SK_PACING_NONE = 0,
|
| 614 | SK_PACING_NEEDED = 1,
|
| 615 | SK_PACING_FQ = 2,
|
| 616 | };
|
| 617 |
|
| 618 | |
| 619 | *
|
| 620 | * - SK_USER_DATA_NOCOPY: Pointer stored in sk_user_data might
|
| 621 | * not be suitable for copying when cloning the socket. For instance,
|
| 622 | * it can point to a reference counted object. sk_user_data bottom
|
| 623 | * bit is set if pointer must not be copied.
|
| 624 | *
|
| 625 | * - SK_USER_DATA_BPF: Mark whether sk_user_data field is
|
| 626 | * managed/owned by a BPF reuseport array. This bit should be set
|
| 627 | * when sk_user_data's sk is added to the bpf's reuseport_array.
|
| 628 | *
|
| 629 | * - SK_USER_DATA_PSOCK: Mark whether pointer stored in
|
| 630 | * sk_user_data points to psock type. This bit should be set
|
| 631 | * when sk_user_data is assigned to a psock object.
|
| 632 |
|
| 633 | #define SK_USER_DATA_NOCOPY 1UL
|
| 634 | #define SK_USER_DATA_BPF 2UL
|
| 635 | #define SK_USER_DATA_PSOCK 4UL
|
| 636 | #define SK_USER_DATA_PTRMASK ~(SK_USER_DATA_NOCOPY | SK_USER_DATA_BPF |\
|
| 637 | SK_USER_DATA_PSOCK)
|
| 638 |
|
| 639 | |
| 640 | * sk_user_data_is_nocopy - Test if sk_user_data pointer must not be copied
|
| 641 | * @sk: socket
|
| 642 |
|
| 643 | static inline bool sk_user_data_is_nocopy(const struct sock *sk)
|
| 644 | {
|
| 645 | return ((uintptr_t)sk->sk_user_data & SK_USER_DATA_NOCOPY);
|
| 646 | }
|
| 647 |
|
| 648 | #define __sk_user_data(sk) ((*((void __rcu **)&(sk)->sk_user_data)))
|
| 649 |
|
| 650 | |
| 651 | * __locked_read_sk_user_data_with_flags - return the pointer
|
| 652 | * only if argument flags all has been set in sk_user_data. Otherwise
|
| 653 | * return NULL
|
| 654 | *
|
| 655 | * @sk: socket
|
| 656 | * @flags: flag bits
|
| 657 | *
|
| 658 | * The caller must be holding sk->sk_callback_lock.
|
| 659 |
|
| 660 | static inline void *
|
| 661 | __locked_read_sk_user_data_with_flags(const struct sock *sk,
|
| 662 | uintptr_t flags)
|
| 663 | {
|
| 664 | uintptr_t sk_user_data =
|
| 665 | (uintptr_t)rcu_dereference_check(__sk_user_data(sk),
|
| 666 | lockdep_is_held(&sk->sk_callback_lock));
|
| 667 |
|
| 668 | WARN_ON_ONCE(flags & SK_USER_DATA_PTRMASK);
|
| 669 |
|
| 670 | if ((sk_user_data & flags) == flags)
|
| 671 | return (void *)(sk_user_data & SK_USER_DATA_PTRMASK);
|
| 672 | return NULL;
|
| 673 | }
|
| 674 |
|
| 675 | |
| 676 | * __rcu_dereference_sk_user_data_with_flags - return the pointer
|
| 677 | * only if argument flags all has been set in sk_user_data. Otherwise
|
| 678 | * return NULL
|
| 679 | *
|
| 680 | * @sk: socket
|
| 681 | * @flags: flag bits
|
| 682 |
|
| 683 | static inline void *
|
| 684 | __rcu_dereference_sk_user_data_with_flags(const struct sock *sk,
|
| 685 | uintptr_t flags)
|
| 686 | {
|
| 687 | uintptr_t sk_user_data = (uintptr_t)rcu_dereference(__sk_user_data(sk));
|
| 688 |
|
| 689 | WARN_ON_ONCE(flags & SK_USER_DATA_PTRMASK);
|
| 690 |
|
| 691 | if ((sk_user_data & flags) == flags)
|
| 692 | return (void *)(sk_user_data & SK_USER_DATA_PTRMASK);
|
| 693 | return NULL;
|
| 694 | }
|
| 695 |
|
| 696 | #define rcu_dereference_sk_user_data(sk) \
|
| 697 | __rcu_dereference_sk_user_data_with_flags(sk, 0)
|
| 698 | #define __rcu_assign_sk_user_data_with_flags(sk, ptr, flags) \
|
| 699 | ({ \
|
| 700 | uintptr_t __tmp1 = (uintptr_t)(ptr), \
|
| 701 | __tmp2 = (uintptr_t)(flags); \
|
| 702 | WARN_ON_ONCE(__tmp1 & ~SK_USER_DATA_PTRMASK); \
|
| 703 | WARN_ON_ONCE(__tmp2 & SK_USER_DATA_PTRMASK); \
|
| 704 | rcu_assign_pointer(__sk_user_data((sk)), \
|
| 705 | __tmp1 | __tmp2); \
|
| 706 | })
|
| 707 | #define rcu_assign_sk_user_data(sk, ptr) \
|
| 708 | __rcu_assign_sk_user_data_with_flags(sk, ptr, 0)
|
| 709 |
|
| 710 | static inline
|
| 711 | struct net *sock_net(const struct sock *sk)
|
| 712 | {
|
| 713 | return read_pnet(&sk->sk_net);
|
| 714 | }
|
| 715 |
|
| 716 | static inline
|
| 717 | void sock_net_set(struct sock *sk, struct net *net)
|
| 718 | {
|
| 719 | write_pnet(&sk->sk_net, net);
|
| 720 | }
|
| 721 |
|
| 722 | |
| 723 | * SK_CAN_REUSE and SK_NO_REUSE on a socket mean that the socket is OK
|
| 724 | * or not whether his port will be reused by someone else. SK_FORCE_REUSE
|
| 725 | * on a socket means that the socket will reuse everybody else's port
|
| 726 | * without looking at the other's sk_reuse value.
|
| 727 |
|
| 728 |
|
| 729 | #define SK_NO_REUSE 0
|
| 730 | #define SK_CAN_REUSE 1
|
| 731 | #define SK_FORCE_REUSE 2
|
| 732 |
|
| 733 | int sk_set_peek_off(struct sock *sk, int val);
|
| 734 |
|
| 735 | static inline int sk_peek_offset(const struct sock *sk, int flags)
|
| 736 | {
|
| 737 | if (unlikely(flags & MSG_PEEK)) {
|
| 738 | return READ_ONCE(sk->sk_peek_off);
|
| 739 | }
|
| 740 |
|
| 741 | return 0;
|
| 742 | }
|
| 743 |
|
| 744 | static inline void sk_peek_offset_bwd(struct sock *sk, int val)
|
| 745 | {
|
| 746 | s32 off = READ_ONCE(sk->sk_peek_off);
|
| 747 |
|
| 748 | if (unlikely(off >= 0)) {
|
| 749 | off = max_t(s32, off - val, 0);
|
| 750 | WRITE_ONCE(sk->sk_peek_off, off);
|
| 751 | }
|
| 752 | }
|
| 753 |
|
| 754 | static inline void sk_peek_offset_fwd(struct sock *sk, int val)
|
| 755 | {
|
| 756 | sk_peek_offset_bwd(sk, -val);
|
| 757 | }
|
| 758 |
|
| 759 | |
| 760 | * Hashed lists helper routines
|
| 761 |
|
| 762 | static inline struct sock *sk_entry(const struct hlist_node *node)
|
| 763 | {
|
| 764 | return hlist_entry(node, struct sock, sk_node);
|
| 765 | }
|
| 766 |
|
| 767 | static inline struct sock *__sk_head(const struct hlist_head *head)
|
| 768 | {
|
| 769 | return hlist_entry(head->first, struct sock, sk_node);
|
| 770 | }
|
| 771 |
|
| 772 | static inline struct sock *sk_head(const struct hlist_head *head)
|
| 773 | {
|
| 774 | return hlist_empty(head) ? NULL : __sk_head(head);
|
| 775 | }
|
| 776 |
|
| 777 | static inline struct sock *__sk_nulls_head(const struct hlist_nulls_head *head)
|
| 778 | {
|
| 779 | return hlist_nulls_entry(head->first, struct sock, sk_nulls_node);
|
| 780 | }
|
| 781 |
|
| 782 | static inline struct sock *sk_nulls_head(const struct hlist_nulls_head *head)
|
| 783 | {
|
| 784 | return hlist_nulls_empty(head) ? NULL : __sk_nulls_head(head);
|
| 785 | }
|
| 786 |
|
| 787 | static inline struct sock *sk_next(const struct sock *sk)
|
| 788 | {
|
| 789 | return hlist_entry_safe(sk->sk_node.next, struct sock, sk_node);
|
| 790 | }
|
| 791 |
|
| 792 | static inline struct sock *sk_nulls_next(const struct sock *sk)
|
| 793 | {
|
| 794 | return (!is_a_nulls(sk->sk_nulls_node.next)) ?
|
| 795 | hlist_nulls_entry(sk->sk_nulls_node.next,
|
| 796 | struct sock, sk_nulls_node) :
|
| 797 | NULL;
|
| 798 | }
|
| 799 |
|
| 800 | static inline bool sk_unhashed(const struct sock *sk)
|
| 801 | {
|
| 802 | return hlist_unhashed(&sk->sk_node);
|
| 803 | }
|
| 804 |
|
| 805 | static inline bool sk_hashed(const struct sock *sk)
|
| 806 | {
|
| 807 | return !sk_unhashed(sk);
|
| 808 | }
|
| 809 |
|
| 810 | static inline void sk_node_init(struct hlist_node *node)
|
| 811 | {
|
| 812 | node->pprev = NULL;
|
| 813 | }
|
| 814 |
|
| 815 | static inline void __sk_del_node(struct sock *sk)
|
| 816 | {
|
| 817 | __hlist_del(&sk->sk_node);
|
| 818 | }
|
| 819 |
|
| 820 |
|
| 821 | static inline bool __sk_del_node_init(struct sock *sk)
|
| 822 | {
|
| 823 | if (sk_hashed(sk)) {
|
| 824 | __sk_del_node(sk);
|
| 825 | sk_node_init(&sk->sk_node);
|
| 826 | return true;
|
| 827 | }
|
| 828 | return false;
|
| 829 | }
|
| 830 |
|
| 831 | |
| 832 | when sk is ALREADY grabbed f.e. it is found in hash table
|
| 833 | or a list and the lookup is made under lock preventing hash table
|
| 834 | modifications.
|
| 835 |
|
| 836 |
|
| 837 | static __always_inline void sock_hold(struct sock *sk)
|
| 838 | {
|
| 839 | refcount_inc(&sk->sk_refcnt);
|
| 840 | }
|
| 841 |
|
| 842 | |
| 843 | cannot hit zero, f.e. it is true in context of any socketcall.
|
| 844 |
|
| 845 | static __always_inline void __sock_put(struct sock *sk)
|
| 846 | {
|
| 847 | refcount_dec(&sk->sk_refcnt);
|
| 848 | }
|
| 849 |
|
| 850 | static inline bool sk_del_node_init(struct sock *sk)
|
| 851 | {
|
| 852 | bool rc = __sk_del_node_init(sk);
|
| 853 |
|
| 854 | if (rc)
|
| 855 | __sock_put(sk);
|
| 856 |
|
| 857 | return rc;
|
| 858 | }
|
| 859 | #define sk_del_node_init_rcu(sk) sk_del_node_init(sk)
|
| 860 |
|
| 861 | static inline bool __sk_nulls_del_node_init_rcu(struct sock *sk)
|
| 862 | {
|
| 863 | if (sk_hashed(sk)) {
|
| 864 | hlist_nulls_del_init_rcu(&sk->sk_nulls_node);
|
| 865 | return true;
|
| 866 | }
|
| 867 | return false;
|
| 868 | }
|
| 869 |
|
| 870 | static inline bool sk_nulls_del_node_init_rcu(struct sock *sk)
|
| 871 | {
|
| 872 | bool rc = __sk_nulls_del_node_init_rcu(sk);
|
| 873 |
|
| 874 | if (rc)
|
| 875 | __sock_put(sk);
|
| 876 |
|
| 877 | return rc;
|
| 878 | }
|
| 879 |
|
| 880 | static inline bool sk_nulls_replace_node_init_rcu(struct sock *old,
|
| 881 | struct sock *new)
|
| 882 | {
|
| 883 | if (sk_hashed(old)) {
|
| 884 | hlist_nulls_replace_init_rcu(&old->sk_nulls_node,
|
| 885 | &new->sk_nulls_node);
|
| 886 | __sock_put(old);
|
| 887 | return true;
|
| 888 | }
|
| 889 |
|
| 890 | return false;
|
| 891 | }
|
| 892 |
|
| 893 | static inline void __sk_add_node(struct sock *sk, struct hlist_head *list)
|
| 894 | {
|
| 895 | hlist_add_head(&sk->sk_node, list);
|
| 896 | }
|
| 897 |
|
| 898 | static inline void sk_add_node(struct sock *sk, struct hlist_head *list)
|
| 899 | {
|
| 900 | sock_hold(sk);
|
| 901 | __sk_add_node(sk, list);
|
| 902 | }
|
| 903 |
|
| 904 | static inline void sk_add_node_rcu(struct sock *sk, struct hlist_head *list)
|
| 905 | {
|
| 906 | sock_hold(sk);
|
| 907 | if (IS_ENABLED(CONFIG_IPV6) && sk->sk_reuseport &&
|
| 908 | sk->sk_family == AF_INET6)
|
| 909 | hlist_add_tail_rcu(&sk->sk_node, list);
|
| 910 | else
|
| 911 | hlist_add_head_rcu(&sk->sk_node, list);
|
| 912 | }
|
| 913 |
|
| 914 | static inline void sk_add_node_tail_rcu(struct sock *sk, struct hlist_head *list)
|
| 915 | {
|
| 916 | sock_hold(sk);
|
| 917 | hlist_add_tail_rcu(&sk->sk_node, list);
|
| 918 | }
|
| 919 |
|
| 920 | static inline void __sk_nulls_add_node_rcu(struct sock *sk, struct hlist_nulls_head *list)
|
| 921 | {
|
| 922 | hlist_nulls_add_head_rcu(&sk->sk_nulls_node, list);
|
| 923 | }
|
| 924 |
|
| 925 | static inline void __sk_nulls_add_node_tail_rcu(struct sock *sk, struct hlist_nulls_head *list)
|
| 926 | {
|
| 927 | hlist_nulls_add_tail_rcu(&sk->sk_nulls_node, list);
|
| 928 | }
|
| 929 |
|
| 930 | static inline void sk_nulls_add_node_rcu(struct sock *sk, struct hlist_nulls_head *list)
|
| 931 | {
|
| 932 | sock_hold(sk);
|
| 933 | __sk_nulls_add_node_rcu(sk, list);
|
| 934 | }
|
| 935 |
|
| 936 | static inline void __sk_del_bind_node(struct sock *sk)
|
| 937 | {
|
| 938 | __hlist_del(&sk->sk_bind_node);
|
| 939 | }
|
| 940 |
|
| 941 | static inline void sk_add_bind_node(struct sock *sk,
|
| 942 | struct hlist_head *list)
|
| 943 | {
|
| 944 | hlist_add_head(&sk->sk_bind_node, list);
|
| 945 | }
|
| 946 |
|
| 947 | #define sk_for_each(__sk, list) \
|
| 948 | hlist_for_each_entry(__sk, list, sk_node)
|
| 949 | #define sk_for_each_rcu(__sk, list) \
|
| 950 | hlist_for_each_entry_rcu(__sk, list, sk_node)
|
| 951 | #define sk_nulls_for_each(__sk, node, list) \
|
| 952 | hlist_nulls_for_each_entry(__sk, node, list, sk_nulls_node)
|
| 953 | #define sk_nulls_for_each_rcu(__sk, node, list) \
|
| 954 | hlist_nulls_for_each_entry_rcu(__sk, node, list, sk_nulls_node)
|
| 955 | #define sk_for_each_from(__sk) \
|
| 956 | hlist_for_each_entry_from(__sk, sk_node)
|
| 957 | #define sk_nulls_for_each_from(__sk, node) \
|
| 958 | if (__sk && ({ node = &(__sk)->sk_nulls_node; 1; })) \
|
| 959 | hlist_nulls_for_each_entry_from(__sk, node, sk_nulls_node)
|
| 960 | #define sk_for_each_safe(__sk, tmp, list) \
|
| 961 | hlist_for_each_entry_safe(__sk, tmp, list, sk_node)
|
| 962 | #define sk_for_each_bound(__sk, list) \
|
| 963 | hlist_for_each_entry(__sk, list, sk_bind_node)
|
| 964 | #define sk_for_each_bound_safe(__sk, tmp, list) \
|
| 965 | hlist_for_each_entry_safe(__sk, tmp, list, sk_bind_node)
|
| 966 |
|
| 967 | |
| 968 | * sk_for_each_entry_offset_rcu - iterate over a list at a given struct offset
|
| 969 | * @tpos: the type * to use as a loop cursor.
|
| 970 | * @pos: the &struct hlist_node to use as a loop cursor.
|
| 971 | * @head: the head for your list.
|
| 972 | * @offset: offset of hlist_node within the struct.
|
| 973 | *
|
| 974 |
|
| 975 | #define sk_for_each_entry_offset_rcu(tpos, pos, head, offset) \
|
| 976 | for (pos = rcu_dereference(hlist_first_rcu(head)); \
|
| 977 | pos != NULL && \
|
| 978 | ({ tpos = (typeof(*tpos) *)((void *)pos - offset); 1;}); \
|
| 979 | pos = rcu_dereference(hlist_next_rcu(pos)))
|
| 980 |
|
| 981 | static inline struct user_namespace *sk_user_ns(const struct sock *sk)
|
| 982 | {
|
| 983 | |
| 984 | * can not change and must all be valid, such as recvmsg from
|
| 985 | * userspace.
|
| 986 |
|
| 987 | return sk->sk_socket->file->f_cred->user_ns;
|
| 988 | }
|
| 989 |
|
| 990 |
|
| 991 | enum sock_flags {
|
| 992 | SOCK_DEAD,
|
| 993 | SOCK_DONE,
|
| 994 | SOCK_URGINLINE,
|
| 995 | SOCK_KEEPOPEN,
|
| 996 | SOCK_LINGER,
|
| 997 | SOCK_DESTROY,
|
| 998 | SOCK_BROADCAST,
|
| 999 | SOCK_TIMESTAMP,
|
| 1000 | SOCK_ZAPPED,
|
| 1001 | SOCK_USE_WRITE_QUEUE,
|
| 1002 | SOCK_DBG,
|
| 1003 | SOCK_RCVTSTAMP,
|
| 1004 | SOCK_RCVTSTAMPNS,
|
| 1005 | SOCK_LOCALROUTE,
|
| 1006 | SOCK_MEMALLOC,
|
| 1007 | SOCK_TIMESTAMPING_RX_SOFTWARE,
|
| 1008 | SOCK_FASYNC,
|
| 1009 | SOCK_RXQ_OVFL,
|
| 1010 | SOCK_ZEROCOPY,
|
| 1011 | SOCK_WIFI_STATUS,
|
| 1012 | SOCK_NOFCS, |
| 1013 | * Will use last 4 bytes of packet sent from
|
| 1014 | * user-space instead.
|
| 1015 |
|
| 1016 | SOCK_FILTER_LOCKED,
|
| 1017 | SOCK_SELECT_ERR_QUEUE,
|
| 1018 | SOCK_RCU_FREE,
|
| 1019 | SOCK_TXTIME,
|
| 1020 | SOCK_XDP,
|
| 1021 | SOCK_TSTAMP_NEW,
|
| 1022 | SOCK_RCVMARK,
|
| 1023 | SOCK_RCVPRIORITY,
|
| 1024 | SOCK_TIMESTAMPING_ANY,
|
| 1025 | };
|
| 1026 |
|
| 1027 | #define SK_FLAGS_TIMESTAMP ((1UL << SOCK_TIMESTAMP) | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE))
|
| 1028 | |
| 1029 | * The highest bit of sk_tsflags is reserved for kernel-internal
|
| 1030 | * SOCKCM_FLAG_TS_OPT_ID. There is a check in core/sock.c to control that
|
| 1031 | * SOF_TIMESTAMPING* values do not reach this reserved area
|
| 1032 |
|
| 1033 | #define SOCKCM_FLAG_TS_OPT_ID BIT(31)
|
| 1034 |
|
| 1035 | static inline void sock_copy_flags(struct sock *nsk, const struct sock *osk)
|
| 1036 | {
|
| 1037 | nsk->sk_flags = osk->sk_flags;
|
| 1038 | }
|
| 1039 |
|
| 1040 | static inline void sock_set_flag(struct sock *sk, enum sock_flags flag)
|
| 1041 | {
|
| 1042 | __set_bit(flag, &sk->sk_flags);
|
| 1043 | }
|
| 1044 |
|
| 1045 | static inline void sock_reset_flag(struct sock *sk, enum sock_flags flag)
|
| 1046 | {
|
| 1047 | __clear_bit(flag, &sk->sk_flags);
|
| 1048 | }
|
| 1049 |
|
| 1050 | static inline void sock_valbool_flag(struct sock *sk, enum sock_flags bit,
|
| 1051 | int valbool)
|
| 1052 | {
|
| 1053 | if (valbool)
|
| 1054 | sock_set_flag(sk, bit);
|
| 1055 | else
|
| 1056 | sock_reset_flag(sk, bit);
|
| 1057 | }
|
| 1058 |
|
| 1059 | static inline bool sock_flag(const struct sock *sk, enum sock_flags flag)
|
| 1060 | {
|
| 1061 | return test_bit(flag, &sk->sk_flags);
|
| 1062 | }
|
| 1063 |
|
| 1064 | #ifdef CONFIG_NET
|
| 1065 | DECLARE_STATIC_KEY_FALSE(memalloc_socks_key);
|
| 1066 | static inline int sk_memalloc_socks(void)
|
| 1067 | {
|
| 1068 | return static_branch_unlikely(&memalloc_socks_key);
|
| 1069 | }
|
| 1070 |
|
| 1071 | void __receive_sock(struct file *file);
|
| 1072 | #else
|
| 1073 |
|
| 1074 | static inline int sk_memalloc_socks(void)
|
| 1075 | {
|
| 1076 | return 0;
|
| 1077 | }
|
| 1078 |
|
| 1079 | static inline void __receive_sock(struct file *file)
|
| 1080 | { }
|
| 1081 | #endif
|
| 1082 |
|
| 1083 | static inline gfp_t sk_gfp_mask(const struct sock *sk, gfp_t gfp_mask)
|
| 1084 | {
|
| 1085 | return gfp_mask | (sk->sk_allocation & __GFP_MEMALLOC);
|
| 1086 | }
|
| 1087 |
|
| 1088 | static inline void sk_acceptq_removed(struct sock *sk)
|
| 1089 | {
|
| 1090 | WRITE_ONCE(sk->sk_ack_backlog, sk->sk_ack_backlog - 1);
|
| 1091 | }
|
| 1092 |
|
| 1093 | static inline void sk_acceptq_added(struct sock *sk)
|
| 1094 | {
|
| 1095 | WRITE_ONCE(sk->sk_ack_backlog, sk->sk_ack_backlog + 1);
|
| 1096 | }
|
| 1097 |
|
| 1098 | |
| 1099 | * return READ_ONCE(sk->sk_ack_backlog) >= READ_ONCE(sk->sk_max_ack_backlog);
|
| 1100 | * Then please take a look at commit 64a146513f8f ("[NET]: Revert incorrect accept queue backlog changes.")
|
| 1101 |
|
| 1102 | static inline bool sk_acceptq_is_full(const struct sock *sk)
|
| 1103 | {
|
| 1104 | return READ_ONCE(sk->sk_ack_backlog) > READ_ONCE(sk->sk_max_ack_backlog);
|
| 1105 | }
|
| 1106 |
|
| 1107 | |
| 1108 | * Compute minimal free write space needed to queue new packets.
|
| 1109 |
|
| 1110 | static inline int sk_stream_min_wspace(const struct sock *sk)
|
| 1111 | {
|
| 1112 | return READ_ONCE(sk->sk_wmem_queued) >> 1;
|
| 1113 | }
|
| 1114 |
|
| 1115 | static inline int sk_stream_wspace(const struct sock *sk)
|
| 1116 | {
|
| 1117 | return READ_ONCE(sk->sk_sndbuf) - READ_ONCE(sk->sk_wmem_queued);
|
| 1118 | }
|
| 1119 |
|
| 1120 | static inline void sk_wmem_queued_add(struct sock *sk, int val)
|
| 1121 | {
|
| 1122 | WRITE_ONCE(sk->sk_wmem_queued, sk->sk_wmem_queued + val);
|
| 1123 | }
|
| 1124 |
|
| 1125 | static inline void sk_forward_alloc_add(struct sock *sk, int val)
|
| 1126 | {
|
| 1127 |
|
| 1128 | WRITE_ONCE(sk->sk_forward_alloc, sk->sk_forward_alloc + val);
|
| 1129 | }
|
| 1130 |
|
| 1131 | void sk_stream_write_space(struct sock *sk);
|
| 1132 |
|
| 1133 |
|
| 1134 | static inline void __sk_add_backlog(struct sock *sk, struct sk_buff *skb)
|
| 1135 | {
|
| 1136 |
|
| 1137 | skb_dst_force(skb);
|
| 1138 |
|
| 1139 | if (!sk->sk_backlog.tail)
|
| 1140 | WRITE_ONCE(sk->sk_backlog.head, skb);
|
| 1141 | else
|
| 1142 | sk->sk_backlog.tail->next = skb;
|
| 1143 |
|
| 1144 | WRITE_ONCE(sk->sk_backlog.tail, skb);
|
| 1145 | skb->next = NULL;
|
| 1146 | }
|
| 1147 |
|
| 1148 | |
| 1149 | * Take into account size of receive queue and backlog queue
|
| 1150 | * Do not take into account this skb truesize,
|
| 1151 | * to allow even a single big packet to come.
|
| 1152 |
|
| 1153 | static inline bool sk_rcvqueues_full(const struct sock *sk, unsigned int limit)
|
| 1154 | {
|
| 1155 | unsigned int qsize = sk->sk_backlog.len + atomic_read(&sk->sk_rmem_alloc);
|
| 1156 |
|
| 1157 | return qsize > limit;
|
| 1158 | }
|
| 1159 |
|
| 1160 |
|
| 1161 | static inline __must_check int sk_add_backlog(struct sock *sk, struct sk_buff *skb,
|
| 1162 | unsigned int limit)
|
| 1163 | {
|
| 1164 | if (sk_rcvqueues_full(sk, limit))
|
| 1165 | return -ENOBUFS;
|
| 1166 |
|
| 1167 | |
| 1168 | * If the skb was allocated from pfmemalloc reserves, only
|
| 1169 | * allow SOCK_MEMALLOC sockets to use it as this socket is
|
| 1170 | * helping free memory
|
| 1171 |
|
| 1172 | if (skb_pfmemalloc(skb) && !sock_flag(sk, SOCK_MEMALLOC))
|
| 1173 | return -ENOMEM;
|
| 1174 |
|
| 1175 | __sk_add_backlog(sk, skb);
|
| 1176 | sk->sk_backlog.len += skb->truesize;
|
| 1177 | return 0;
|
| 1178 | }
|
| 1179 |
|
| 1180 | int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb);
|
| 1181 |
|
| 1182 | INDIRECT_CALLABLE_DECLARE(int tcp_v4_do_rcv(struct sock *sk, struct sk_buff *skb));
|
| 1183 | INDIRECT_CALLABLE_DECLARE(int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb));
|
| 1184 |
|
| 1185 | static inline int sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
|
| 1186 | {
|
| 1187 | if (sk_memalloc_socks() && skb_pfmemalloc(skb))
|
| 1188 | return __sk_backlog_rcv(sk, skb);
|
| 1189 |
|
| 1190 | return INDIRECT_CALL_INET(sk->sk_backlog_rcv,
|
| 1191 | tcp_v6_do_rcv,
|
| 1192 | tcp_v4_do_rcv,
|
| 1193 | sk, skb);
|
| 1194 | }
|
| 1195 |
|
| 1196 | static inline void sk_incoming_cpu_update(struct sock *sk)
|
| 1197 | {
|
| 1198 | int cpu = raw_smp_processor_id();
|
| 1199 |
|
| 1200 | if (unlikely(READ_ONCE(sk->sk_incoming_cpu) != cpu))
|
| 1201 | WRITE_ONCE(sk->sk_incoming_cpu, cpu);
|
| 1202 | }
|
| 1203 |
|
| 1204 |
|
| 1205 | static inline void sock_rps_save_rxhash(struct sock *sk,
|
| 1206 | const struct sk_buff *skb)
|
| 1207 | {
|
| 1208 | #ifdef CONFIG_RPS
|
| 1209 | |
| 1210 | * here, and another one in sock_rps_record_flow().
|
| 1211 |
|
| 1212 | if (unlikely(READ_ONCE(sk->sk_rxhash) != skb->hash))
|
| 1213 | WRITE_ONCE(sk->sk_rxhash, skb->hash);
|
| 1214 | #endif
|
| 1215 | }
|
| 1216 |
|
| 1217 | static inline void sock_rps_reset_rxhash(struct sock *sk)
|
| 1218 | {
|
| 1219 | #ifdef CONFIG_RPS
|
| 1220 |
|
| 1221 | WRITE_ONCE(sk->sk_rxhash, 0);
|
| 1222 | #endif
|
| 1223 | }
|
| 1224 |
|
| 1225 | #define sk_wait_event(__sk, __timeo, __condition, __wait) \
|
| 1226 | ({ int __rc, __dis = __sk->sk_disconnects; \
|
| 1227 | release_sock(__sk); \
|
| 1228 | __rc = __condition; \
|
| 1229 | if (!__rc) { \
|
| 1230 | *(__timeo) = wait_woken(__wait, \
|
| 1231 | TASK_INTERRUPTIBLE, \
|
| 1232 | *(__timeo)); \
|
| 1233 | } \
|
| 1234 | sched_annotate_sleep(); \
|
| 1235 | lock_sock(__sk); \
|
| 1236 | __rc = __dis == __sk->sk_disconnects ? __condition : -EPIPE; \
|
| 1237 | __rc; \
|
| 1238 | })
|
| 1239 |
|
| 1240 | int sk_stream_wait_connect(struct sock *sk, long *timeo_p);
|
| 1241 | int sk_stream_wait_memory(struct sock *sk, long *timeo_p);
|
| 1242 | void sk_stream_wait_close(struct sock *sk, long timeo_p);
|
| 1243 | int sk_stream_error(struct sock *sk, int flags, int err);
|
| 1244 | void sk_stream_kill_queues(struct sock *sk);
|
| 1245 | void sk_set_memalloc(struct sock *sk);
|
| 1246 | void sk_clear_memalloc(struct sock *sk);
|
| 1247 |
|
| 1248 | void __sk_flush_backlog(struct sock *sk);
|
| 1249 |
|
| 1250 | static inline bool sk_flush_backlog(struct sock *sk)
|
| 1251 | {
|
| 1252 | if (unlikely(READ_ONCE(sk->sk_backlog.tail))) {
|
| 1253 | __sk_flush_backlog(sk);
|
| 1254 | return true;
|
| 1255 | }
|
| 1256 | return false;
|
| 1257 | }
|
| 1258 |
|
| 1259 | int sk_wait_data(struct sock *sk, long *timeo, const struct sk_buff *skb);
|
| 1260 |
|
| 1261 | struct request_sock_ops;
|
| 1262 | struct timewait_sock_ops;
|
| 1263 | struct inet_hashinfo;
|
| 1264 | struct raw_hashinfo;
|
| 1265 | struct smc_hashinfo;
|
| 1266 | struct module;
|
| 1267 | struct sk_psock;
|
| 1268 |
|
| 1269 | |
| 1270 | * caches using SLAB_TYPESAFE_BY_RCU should let .next pointer from nulls nodes
|
| 1271 | * un-modified. Special care is taken when initializing object to zero.
|
| 1272 |
|
| 1273 | static inline void sk_prot_clear_nulls(struct sock *sk, int size)
|
| 1274 | {
|
| 1275 | if (offsetof(struct sock, sk_node.next) != 0)
|
| 1276 | memset(sk, 0, offsetof(struct sock, sk_node.next));
|
| 1277 | memset(&sk->sk_node.pprev, 0,
|
| 1278 | size - offsetof(struct sock, sk_node.pprev));
|
| 1279 | }
|
| 1280 |
|
| 1281 | struct proto_accept_arg {
|
| 1282 | int flags;
|
| 1283 | int err;
|
| 1284 | int is_empty;
|
| 1285 | bool kern;
|
| 1286 | };
|
| 1287 |
|
| 1288 | |
| 1289 | * socket layer -> transport layer interface
|
| 1290 |
|
| 1291 | struct proto {
|
| 1292 | void (*close)(struct sock *sk,
|
| 1293 | long timeout);
|
| 1294 | int (*pre_connect)(struct sock *sk,
|
| 1295 | struct sockaddr_unsized *uaddr,
|
| 1296 | int addr_len);
|
| 1297 | int (*connect)(struct sock *sk,
|
| 1298 | struct sockaddr_unsized *uaddr,
|
| 1299 | int addr_len);
|
| 1300 | int (*disconnect)(struct sock *sk, int flags);
|
| 1301 |
|
| 1302 | struct sock * (*accept)(struct sock *sk,
|
| 1303 | struct proto_accept_arg *arg);
|
| 1304 |
|
| 1305 | int (*ioctl)(struct sock *sk, int cmd,
|
| 1306 | int *karg);
|
| 1307 | int (*init)(struct sock *sk);
|
| 1308 | void (*destroy)(struct sock *sk);
|
| 1309 | void (*shutdown)(struct sock *sk, int how);
|
| 1310 | int (*setsockopt)(struct sock *sk, int level,
|
| 1311 | int optname, sockptr_t optval,
|
| 1312 | unsigned int optlen);
|
| 1313 | int (*getsockopt)(struct sock *sk, int level,
|
| 1314 | int optname, char __user *optval,
|
| 1315 | int __user *option);
|
| 1316 | void (*keepalive)(struct sock *sk, int valbool);
|
| 1317 | #ifdef CONFIG_COMPAT
|
| 1318 | int (*compat_ioctl)(struct sock *sk,
|
| 1319 | unsigned int cmd, unsigned long arg);
|
| 1320 | #endif
|
| 1321 | int (*sendmsg)(struct sock *sk, struct msghdr *msg,
|
| 1322 | size_t len);
|
| 1323 | int (*recvmsg)(struct sock *sk, struct msghdr *msg,
|
| 1324 | size_t len, int flags);
|
| 1325 | void (*splice_eof)(struct socket *sock);
|
| 1326 | int (*bind)(struct sock *sk,
|
| 1327 | struct sockaddr_unsized *addr, int addr_len);
|
| 1328 | int (*bind_add)(struct sock *sk,
|
| 1329 | struct sockaddr_unsized *addr, int addr_len);
|
| 1330 |
|
| 1331 | int (*backlog_rcv) (struct sock *sk,
|
| 1332 | struct sk_buff *skb);
|
| 1333 | bool (*bpf_bypass_getsockopt)(int level,
|
| 1334 | int optname);
|
| 1335 |
|
| 1336 | void (*release_cb)(struct sock *sk);
|
| 1337 |
|
| 1338 |
|
| 1339 | int (*hash)(struct sock *sk);
|
| 1340 | void (*unhash)(struct sock *sk);
|
| 1341 | void (*rehash)(struct sock *sk);
|
| 1342 | int (*get_port)(struct sock *sk, unsigned short snum);
|
| 1343 | void (*put_port)(struct sock *sk);
|
| 1344 | #ifdef CONFIG_BPF_SYSCALL
|
| 1345 | int (*psock_update_sk_prot)(struct sock *sk,
|
| 1346 | struct sk_psock *psock,
|
| 1347 | bool restore);
|
| 1348 | #endif
|
| 1349 |
|
| 1350 |
|
| 1351 | #ifdef CONFIG_PROC_FS
|
| 1352 | unsigned int inuse_idx;
|
| 1353 | #endif
|
| 1354 |
|
| 1355 | bool (*stream_memory_free)(const struct sock *sk, int wake);
|
| 1356 | bool (*sock_is_readable)(struct sock *sk);
|
| 1357 |
|
| 1358 | void (*enter_memory_pressure)(struct sock *sk);
|
| 1359 | void (*leave_memory_pressure)(struct sock *sk);
|
| 1360 | atomic_long_t *memory_allocated;
|
| 1361 | int __percpu *per_cpu_fw_alloc;
|
| 1362 | struct percpu_counter *sockets_allocated;
|
| 1363 |
|
| 1364 | |
| 1365 | * Pressure flag: try to collapse.
|
| 1366 | * Technical note: it is used by multiple contexts non atomically.
|
| 1367 | * Make sure to use READ_ONCE()/WRITE_ONCE() for all reads/writes.
|
| 1368 | * All the __sk_mem_schedule() is of this nature: accounting
|
| 1369 | * is strict, actions are advisory and have some latency.
|
| 1370 |
|
| 1371 | unsigned long *memory_pressure;
|
| 1372 | long *sysctl_mem;
|
| 1373 |
|
| 1374 | int *sysctl_wmem;
|
| 1375 | int *sysctl_rmem;
|
| 1376 | u32 sysctl_wmem_offset;
|
| 1377 | u32 sysctl_rmem_offset;
|
| 1378 |
|
| 1379 | int max_header;
|
| 1380 | bool no_autobind;
|
| 1381 |
|
| 1382 | struct kmem_cache *slab;
|
| 1383 | unsigned int obj_size;
|
| 1384 | unsigned int freeptr_offset;
|
| 1385 | unsigned int ipv6_pinfo_offset;
|
| 1386 | slab_flags_t slab_flags;
|
| 1387 | unsigned int useroffset;
|
| 1388 | unsigned int usersize;
|
| 1389 |
|
| 1390 | struct request_sock_ops *rsk_prot;
|
| 1391 | struct timewait_sock_ops *twsk_prot;
|
| 1392 |
|
| 1393 | union {
|
| 1394 | struct inet_hashinfo *hashinfo;
|
| 1395 | struct raw_hashinfo *raw_hash;
|
| 1396 | struct smc_hashinfo *smc_hash;
|
| 1397 | } h;
|
| 1398 |
|
| 1399 | struct module *owner;
|
| 1400 |
|
| 1401 | char name[32];
|
| 1402 |
|
| 1403 | struct list_head node;
|
| 1404 | int (*diag_destroy)(struct sock *sk, int err);
|
| 1405 | } __randomize_layout;
|
| 1406 |
|
| 1407 | int proto_register(struct proto *prot, int alloc_slab);
|
| 1408 | void proto_unregister(struct proto *prot);
|
| 1409 | int sock_load_diag_module(int family, int protocol);
|
| 1410 |
|
| 1411 | INDIRECT_CALLABLE_DECLARE(bool tcp_stream_memory_free(const struct sock *sk, int wake));
|
| 1412 |
|
| 1413 | static inline bool __sk_stream_memory_free(const struct sock *sk, int wake)
|
| 1414 | {
|
| 1415 | if (READ_ONCE(sk->sk_wmem_queued) >= READ_ONCE(sk->sk_sndbuf))
|
| 1416 | return false;
|
| 1417 |
|
| 1418 | return sk->sk_prot->stream_memory_free ?
|
| 1419 | INDIRECT_CALL_INET_1(sk->sk_prot->stream_memory_free,
|
| 1420 | tcp_stream_memory_free, sk, wake) : true;
|
| 1421 | }
|
| 1422 |
|
| 1423 | static inline bool sk_stream_memory_free(const struct sock *sk)
|
| 1424 | {
|
| 1425 | return __sk_stream_memory_free(sk, 0);
|
| 1426 | }
|
| 1427 |
|
| 1428 | static inline bool __sk_stream_is_writeable(const struct sock *sk, int wake)
|
| 1429 | {
|
| 1430 | return sk_stream_wspace(sk) >= sk_stream_min_wspace(sk) &&
|
| 1431 | __sk_stream_memory_free(sk, wake);
|
| 1432 | }
|
| 1433 |
|
| 1434 | static inline bool sk_stream_is_writeable(const struct sock *sk)
|
| 1435 | {
|
| 1436 | return __sk_stream_is_writeable(sk, 0);
|
| 1437 | }
|
| 1438 |
|
| 1439 | static inline int sk_under_cgroup_hierarchy(struct sock *sk,
|
| 1440 | struct cgroup *ancestor)
|
| 1441 | {
|
| 1442 | #ifdef CONFIG_SOCK_CGROUP_DATA
|
| 1443 | return cgroup_is_descendant(sock_cgroup_ptr(&sk->sk_cgrp_data),
|
| 1444 | ancestor);
|
| 1445 | #else
|
| 1446 | return -ENOTSUPP;
|
| 1447 | #endif
|
| 1448 | }
|
| 1449 |
|
| 1450 | #define SK_ALLOC_PERCPU_COUNTER_BATCH 16
|
| 1451 |
|
| 1452 | static inline void sk_sockets_allocated_dec(struct sock *sk)
|
| 1453 | {
|
| 1454 | percpu_counter_add_batch(sk->sk_prot->sockets_allocated, -1,
|
| 1455 | SK_ALLOC_PERCPU_COUNTER_BATCH);
|
| 1456 | }
|
| 1457 |
|
| 1458 | static inline void sk_sockets_allocated_inc(struct sock *sk)
|
| 1459 | {
|
| 1460 | percpu_counter_add_batch(sk->sk_prot->sockets_allocated, 1,
|
| 1461 | SK_ALLOC_PERCPU_COUNTER_BATCH);
|
| 1462 | }
|
| 1463 |
|
| 1464 | static inline u64
|
| 1465 | sk_sockets_allocated_read_positive(struct sock *sk)
|
| 1466 | {
|
| 1467 | return percpu_counter_read_positive(sk->sk_prot->sockets_allocated);
|
| 1468 | }
|
| 1469 |
|
| 1470 | static inline int
|
| 1471 | proto_sockets_allocated_sum_positive(struct proto *prot)
|
| 1472 | {
|
| 1473 | return percpu_counter_sum_positive(prot->sockets_allocated);
|
| 1474 | }
|
| 1475 |
|
| 1476 | #ifdef CONFIG_PROC_FS
|
| 1477 | #define PROTO_INUSE_NR 64
|
| 1478 | struct prot_inuse {
|
| 1479 | int all;
|
| 1480 | int val[PROTO_INUSE_NR];
|
| 1481 | };
|
| 1482 |
|
| 1483 | static inline void sock_prot_inuse_add(const struct net *net,
|
| 1484 | const struct proto *prot, int val)
|
| 1485 | {
|
| 1486 | this_cpu_add(net->core.prot_inuse->val[prot->inuse_idx], val);
|
| 1487 | }
|
| 1488 |
|
| 1489 | static inline void sock_inuse_add(const struct net *net, int val)
|
| 1490 | {
|
| 1491 | this_cpu_add(net->core.prot_inuse->all, val);
|
| 1492 | }
|
| 1493 |
|
| 1494 | int sock_prot_inuse_get(struct net *net, struct proto *proto);
|
| 1495 | int sock_inuse_get(struct net *net);
|
| 1496 | #else
|
| 1497 | static inline void sock_prot_inuse_add(const struct net *net,
|
| 1498 | const struct proto *prot, int val)
|
| 1499 | {
|
| 1500 | }
|
| 1501 |
|
| 1502 | static inline void sock_inuse_add(const struct net *net, int val)
|
| 1503 | {
|
| 1504 | }
|
| 1505 | #endif
|
| 1506 |
|
| 1507 |
|
| 1508 | |
| 1509 | * this version is not worse.
|
| 1510 |
|
| 1511 | static inline int __sk_prot_rehash(struct sock *sk)
|
| 1512 | {
|
| 1513 | sk->sk_prot->unhash(sk);
|
| 1514 | return sk->sk_prot->hash(sk);
|
| 1515 | }
|
| 1516 |
|
| 1517 |
|
| 1518 | #define SOCK_DESTROY_TIME (10*HZ)
|
| 1519 |
|
| 1520 |
|
| 1521 | #define PROT_SOCK 1024
|
| 1522 |
|
| 1523 | #define SHUTDOWN_MASK 3
|
| 1524 | #define RCV_SHUTDOWN 1
|
| 1525 | #define SEND_SHUTDOWN 2
|
| 1526 |
|
| 1527 | #define SOCK_BINDADDR_LOCK 4
|
| 1528 | #define SOCK_BINDPORT_LOCK 8
|
| 1529 | |
| 1530 | * define SOCK_CONNECT_BIND - &sock->sk_userlocks flag for auto-bind at connect() time
|
| 1531 |
|
| 1532 | #define SOCK_CONNECT_BIND 16
|
| 1533 |
|
| 1534 | struct socket_alloc {
|
| 1535 | struct socket socket;
|
| 1536 | struct inode vfs_inode;
|
| 1537 | };
|
| 1538 |
|
| 1539 | static inline struct socket *SOCKET_I(struct inode *inode)
|
| 1540 | {
|
| 1541 | return &container_of(inode, struct socket_alloc, vfs_inode)->socket;
|
| 1542 | }
|
| 1543 |
|
| 1544 | static inline struct inode *SOCK_INODE(struct socket *socket)
|
| 1545 | {
|
| 1546 | return &container_of(socket, struct socket_alloc, socket)->vfs_inode;
|
| 1547 | }
|
| 1548 |
|
| 1549 | |
| 1550 | * Functions for memory accounting
|
| 1551 |
|
| 1552 | int __sk_mem_raise_allocated(struct sock *sk, int size, int amt, int kind);
|
| 1553 | int __sk_mem_schedule(struct sock *sk, int size, int kind);
|
| 1554 | void __sk_mem_reduce_allocated(struct sock *sk, int amount);
|
| 1555 | void __sk_mem_reclaim(struct sock *sk, int amount);
|
| 1556 |
|
| 1557 | #define SK_MEM_SEND 0
|
| 1558 | #define SK_MEM_RECV 1
|
| 1559 |
|
| 1560 |
|
| 1561 | static inline long sk_prot_mem_limits(const struct sock *sk, int index)
|
| 1562 | {
|
| 1563 | return READ_ONCE(sk->sk_prot->sysctl_mem[index]);
|
| 1564 | }
|
| 1565 |
|
| 1566 | static inline int sk_mem_pages(int amt)
|
| 1567 | {
|
| 1568 | return (amt + PAGE_SIZE - 1) >> PAGE_SHIFT;
|
| 1569 | }
|
| 1570 |
|
| 1571 | static inline bool sk_has_account(struct sock *sk)
|
| 1572 | {
|
| 1573 |
|
| 1574 | return !!sk->sk_prot->memory_allocated;
|
| 1575 | }
|
| 1576 |
|
| 1577 | static inline bool sk_wmem_schedule(struct sock *sk, int size)
|
| 1578 | {
|
| 1579 | int delta;
|
| 1580 |
|
| 1581 | if (!sk_has_account(sk))
|
| 1582 | return true;
|
| 1583 | delta = size - sk->sk_forward_alloc;
|
| 1584 | return delta <= 0 || __sk_mem_schedule(sk, delta, SK_MEM_SEND);
|
| 1585 | }
|
| 1586 |
|
| 1587 | static inline bool
|
| 1588 | __sk_rmem_schedule(struct sock *sk, int size, bool pfmemalloc)
|
| 1589 | {
|
| 1590 | int delta;
|
| 1591 |
|
| 1592 | if (!sk_has_account(sk))
|
| 1593 | return true;
|
| 1594 | delta = size - sk->sk_forward_alloc;
|
| 1595 | return delta <= 0 || __sk_mem_schedule(sk, delta, SK_MEM_RECV) ||
|
| 1596 | pfmemalloc;
|
| 1597 | }
|
| 1598 |
|
| 1599 | static inline bool
|
| 1600 | sk_rmem_schedule(struct sock *sk, const struct sk_buff *skb, int size)
|
| 1601 | {
|
| 1602 | return __sk_rmem_schedule(sk, size, skb_pfmemalloc(skb));
|
| 1603 | }
|
| 1604 |
|
| 1605 | static inline int sk_unused_reserved_mem(const struct sock *sk)
|
| 1606 | {
|
| 1607 | int unused_mem;
|
| 1608 |
|
| 1609 | if (likely(!sk->sk_reserved_mem))
|
| 1610 | return 0;
|
| 1611 |
|
| 1612 | unused_mem = sk->sk_reserved_mem - sk->sk_wmem_queued -
|
| 1613 | atomic_read(&sk->sk_rmem_alloc);
|
| 1614 |
|
| 1615 | return unused_mem > 0 ? unused_mem : 0;
|
| 1616 | }
|
| 1617 |
|
| 1618 | static inline void sk_mem_reclaim(struct sock *sk)
|
| 1619 | {
|
| 1620 | int reclaimable;
|
| 1621 |
|
| 1622 | if (!sk_has_account(sk))
|
| 1623 | return;
|
| 1624 |
|
| 1625 | reclaimable = sk->sk_forward_alloc - sk_unused_reserved_mem(sk);
|
| 1626 |
|
| 1627 | if (reclaimable >= (int)PAGE_SIZE)
|
| 1628 | __sk_mem_reclaim(sk, reclaimable);
|
| 1629 | }
|
| 1630 |
|
| 1631 | static inline void sk_mem_reclaim_final(struct sock *sk)
|
| 1632 | {
|
| 1633 | sk->sk_reserved_mem = 0;
|
| 1634 | sk_mem_reclaim(sk);
|
| 1635 | }
|
| 1636 |
|
| 1637 | static inline void sk_mem_charge(struct sock *sk, int size)
|
| 1638 | {
|
| 1639 | if (!sk_has_account(sk))
|
| 1640 | return;
|
| 1641 | sk_forward_alloc_add(sk, -size);
|
| 1642 | }
|
| 1643 |
|
| 1644 | static inline void sk_mem_uncharge(struct sock *sk, int size)
|
| 1645 | {
|
| 1646 | if (!sk_has_account(sk))
|
| 1647 | return;
|
| 1648 | sk_forward_alloc_add(sk, size);
|
| 1649 | sk_mem_reclaim(sk);
|
| 1650 | }
|
| 1651 |
|
| 1652 | void __sk_charge(struct sock *sk, gfp_t gfp);
|
| 1653 |
|
| 1654 | #if IS_ENABLED(CONFIG_PROVE_LOCKING) && IS_ENABLED(CONFIG_MODULES)
|
| 1655 | static inline void sk_owner_set(struct sock *sk, struct module *owner)
|
| 1656 | {
|
| 1657 | __module_get(owner);
|
| 1658 | sk->sk_owner = owner;
|
| 1659 | }
|
| 1660 |
|
| 1661 | static inline void sk_owner_clear(struct sock *sk)
|
| 1662 | {
|
| 1663 | sk->sk_owner = NULL;
|
| 1664 | }
|
| 1665 |
|
| 1666 | static inline void sk_owner_put(struct sock *sk)
|
| 1667 | {
|
| 1668 | module_put(sk->sk_owner);
|
| 1669 | }
|
| 1670 | #else
|
| 1671 | static inline void sk_owner_set(struct sock *sk, struct module *owner)
|
| 1672 | {
|
| 1673 | }
|
| 1674 |
|
| 1675 | static inline void sk_owner_clear(struct sock *sk)
|
| 1676 | {
|
| 1677 | }
|
| 1678 |
|
| 1679 | static inline void sk_owner_put(struct sock *sk)
|
| 1680 | {
|
| 1681 | }
|
| 1682 | #endif
|
| 1683 | |
| 1684 | * Macro so as to not evaluate some arguments when
|
| 1685 | * lockdep is not enabled.
|
| 1686 | *
|
| 1687 | * Mark both the sk_lock and the sk_lock.slock as a
|
| 1688 | * per-address-family lock class.
|
| 1689 |
|
| 1690 | #define sock_lock_init_class_and_name(sk, sname, skey, name, key) \
|
| 1691 | do { \
|
| 1692 | sk_owner_set(sk, THIS_MODULE); \
|
| 1693 | sk->sk_lock.owned = 0; \
|
| 1694 | init_waitqueue_head(&sk->sk_lock.wq); \
|
| 1695 | spin_lock_init(&(sk)->sk_lock.slock); \
|
| 1696 | debug_check_no_locks_freed((void *)&(sk)->sk_lock, \
|
| 1697 | sizeof((sk)->sk_lock)); \
|
| 1698 | lockdep_set_class_and_name(&(sk)->sk_lock.slock, \
|
| 1699 | (skey), (sname)); \
|
| 1700 | lockdep_init_map(&(sk)->sk_lock.dep_map, (name), (key), 0); \
|
| 1701 | } while (0)
|
| 1702 |
|
| 1703 | static inline bool lockdep_sock_is_held(const struct sock *sk)
|
| 1704 | {
|
| 1705 | return lockdep_is_held(&sk->sk_lock) ||
|
| 1706 | lockdep_is_held(&sk->sk_lock.slock);
|
| 1707 | }
|
| 1708 |
|
| 1709 | void lock_sock_nested(struct sock *sk, int subclass);
|
| 1710 |
|
| 1711 | static inline void lock_sock(struct sock *sk)
|
| 1712 | {
|
| 1713 | lock_sock_nested(sk, 0);
|
| 1714 | }
|
| 1715 |
|
| 1716 | void __release_sock(struct sock *sk);
|
| 1717 | void release_sock(struct sock *sk);
|
| 1718 |
|
| 1719 |
|
| 1720 | #define bh_lock_sock(__sk) spin_lock(&((__sk)->sk_lock.slock))
|
| 1721 | #define bh_lock_sock_nested(__sk) \
|
| 1722 | spin_lock_nested(&((__sk)->sk_lock.slock), \
|
| 1723 | SINGLE_DEPTH_NESTING)
|
| 1724 | #define bh_unlock_sock(__sk) spin_unlock(&((__sk)->sk_lock.slock))
|
| 1725 |
|
| 1726 | bool __lock_sock_fast(struct sock *sk) __acquires(&sk->sk_lock.slock);
|
| 1727 |
|
| 1728 | |
| 1729 | * lock_sock_fast - fast version of lock_sock
|
| 1730 | * @sk: socket
|
| 1731 | *
|
| 1732 | * This version should be used for very small section, where process won't block
|
| 1733 | * return false if fast path is taken:
|
| 1734 | *
|
| 1735 | * sk_lock.slock locked, owned = 0, BH disabled
|
| 1736 | *
|
| 1737 | * return true if slow path is taken:
|
| 1738 | *
|
| 1739 | * sk_lock.slock unlocked, owned = 1, BH enabled
|
| 1740 |
|
| 1741 | static inline bool lock_sock_fast(struct sock *sk)
|
| 1742 | {
|
| 1743 |
|
| 1744 | mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
|
| 1745 |
|
| 1746 | return __lock_sock_fast(sk);
|
| 1747 | }
|
| 1748 |
|
| 1749 |
|
| 1750 | static inline bool lock_sock_fast_nested(struct sock *sk)
|
| 1751 | {
|
| 1752 | mutex_acquire(&sk->sk_lock.dep_map, SINGLE_DEPTH_NESTING, 0, _RET_IP_);
|
| 1753 |
|
| 1754 | return __lock_sock_fast(sk);
|
| 1755 | }
|
| 1756 |
|
| 1757 | |
| 1758 | * unlock_sock_fast - complement of lock_sock_fast
|
| 1759 | * @sk: socket
|
| 1760 | * @slow: slow mode
|
| 1761 | *
|
| 1762 | * fast unlock socket for user context.
|
| 1763 | * If slow mode is on, we call regular release_sock()
|
| 1764 |
|
| 1765 | static inline void unlock_sock_fast(struct sock *sk, bool slow)
|
| 1766 | __releases(&sk->sk_lock.slock)
|
| 1767 | {
|
| 1768 | if (slow) {
|
| 1769 | release_sock(sk);
|
| 1770 | __release(&sk->sk_lock.slock);
|
| 1771 | } else {
|
| 1772 | mutex_release(&sk->sk_lock.dep_map, _RET_IP_);
|
| 1773 | spin_unlock_bh(&sk->sk_lock.slock);
|
| 1774 | }
|
| 1775 | }
|
| 1776 |
|
| 1777 | void sockopt_lock_sock(struct sock *sk);
|
| 1778 | void sockopt_release_sock(struct sock *sk);
|
| 1779 | bool sockopt_ns_capable(struct user_namespace *ns, int cap);
|
| 1780 | bool sockopt_capable(int cap);
|
| 1781 |
|
| 1782 | |
| 1783 | * interrupts and bottom half handlers won't change it
|
| 1784 | * from under us. It essentially blocks any incoming
|
| 1785 | * packets, so that we won't get any new data or any
|
| 1786 | * packets that change the state of the socket.
|
| 1787 | *
|
| 1788 | * While locked, BH processing will add new packets to
|
| 1789 | * the backlog queue. This queue is processed by the
|
| 1790 | * owner of the socket lock right before it is released.
|
| 1791 | *
|
| 1792 | * Since ~2.3.5 it is also exclusive sleep lock serializing
|
| 1793 | * accesses from user process context.
|
| 1794 |
|
| 1795 |
|
| 1796 | static inline void sock_owned_by_me(const struct sock *sk)
|
| 1797 | {
|
| 1798 | #ifdef CONFIG_LOCKDEP
|
| 1799 | WARN_ON_ONCE(!lockdep_sock_is_held(sk) && debug_locks);
|
| 1800 | #endif
|
| 1801 | }
|
| 1802 |
|
| 1803 | static inline void sock_not_owned_by_me(const struct sock *sk)
|
| 1804 | {
|
| 1805 | #ifdef CONFIG_LOCKDEP
|
| 1806 | WARN_ON_ONCE(lockdep_sock_is_held(sk) && debug_locks);
|
| 1807 | #endif
|
| 1808 | }
|
| 1809 |
|
| 1810 | static inline bool sock_owned_by_user(const struct sock *sk)
|
| 1811 | {
|
| 1812 | sock_owned_by_me(sk);
|
| 1813 | return sk->sk_lock.owned;
|
| 1814 | }
|
| 1815 |
|
| 1816 | static inline bool sock_owned_by_user_nocheck(const struct sock *sk)
|
| 1817 | {
|
| 1818 | return sk->sk_lock.owned;
|
| 1819 | }
|
| 1820 |
|
| 1821 | static inline void sock_release_ownership(struct sock *sk)
|
| 1822 | {
|
| 1823 | DEBUG_NET_WARN_ON_ONCE(!sock_owned_by_user_nocheck(sk));
|
| 1824 | sk->sk_lock.owned = 0;
|
| 1825 |
|
| 1826 |
|
| 1827 | mutex_release(&sk->sk_lock.dep_map, _RET_IP_);
|
| 1828 | }
|
| 1829 |
|
| 1830 |
|
| 1831 | static inline bool sock_allow_reclassification(const struct sock *csk)
|
| 1832 | {
|
| 1833 | struct sock *sk = (struct sock *)csk;
|
| 1834 |
|
| 1835 | return !sock_owned_by_user_nocheck(sk) &&
|
| 1836 | !spin_is_locked(&sk->sk_lock.slock);
|
| 1837 | }
|
| 1838 |
|
| 1839 | struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
|
| 1840 | struct proto *prot, int kern);
|
| 1841 | void sk_free(struct sock *sk);
|
| 1842 | void sk_net_refcnt_upgrade(struct sock *sk);
|
| 1843 | void sk_destruct(struct sock *sk);
|
| 1844 | struct sock *sk_clone(const struct sock *sk, const gfp_t priority, bool lock);
|
| 1845 |
|
| 1846 | static inline struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
|
| 1847 | {
|
| 1848 | return sk_clone(sk, priority, true);
|
| 1849 | }
|
| 1850 |
|
| 1851 | struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
|
| 1852 | gfp_t priority);
|
| 1853 | void sock_wfree(struct sk_buff *skb);
|
| 1854 | void __sock_wfree(struct sk_buff *skb);
|
| 1855 | void tcp_wfree(struct sk_buff *skb);
|
| 1856 |
|
| 1857 | static inline bool is_skb_wmem(const struct sk_buff *skb)
|
| 1858 | {
|
| 1859 | return skb->destructor == sock_wfree ||
|
| 1860 | (IS_ENABLED(CONFIG_INET) && skb->destructor == __sock_wfree) ||
|
| 1861 | (IS_ENABLED(CONFIG_INET) && skb->destructor == tcp_wfree);
|
| 1862 | }
|
| 1863 |
|
| 1864 | struct sk_buff *sock_omalloc(struct sock *sk, unsigned long size,
|
| 1865 | gfp_t priority);
|
| 1866 | void skb_orphan_partial(struct sk_buff *skb);
|
| 1867 | void sock_rfree(struct sk_buff *skb);
|
| 1868 | void sock_rmem_free(struct sk_buff *skb);
|
| 1869 | void sock_efree(struct sk_buff *skb);
|
| 1870 | #ifdef CONFIG_INET
|
| 1871 | void sock_edemux(struct sk_buff *skb);
|
| 1872 | void sock_pfree(struct sk_buff *skb);
|
| 1873 |
|
| 1874 | static inline void skb_set_owner_edemux(struct sk_buff *skb, struct sock *sk)
|
| 1875 | {
|
| 1876 | skb_orphan(skb);
|
| 1877 | if (refcount_inc_not_zero(&sk->sk_refcnt)) {
|
| 1878 | skb->sk = sk;
|
| 1879 | skb->destructor = sock_edemux;
|
| 1880 | }
|
| 1881 | }
|
| 1882 | #else
|
| 1883 | #define sock_edemux sock_efree
|
| 1884 | #endif
|
| 1885 |
|
| 1886 | int sk_setsockopt(struct sock *sk, int level, int optname,
|
| 1887 | sockptr_t optval, unsigned int optlen);
|
| 1888 | int sock_setsockopt(struct socket *sock, int level, int op,
|
| 1889 | sockptr_t optval, unsigned int optlen);
|
| 1890 | int do_sock_setsockopt(struct socket *sock, bool compat, int level,
|
| 1891 | int optname, sockptr_t optval, int optlen);
|
| 1892 | int do_sock_getsockopt(struct socket *sock, bool compat, int level,
|
| 1893 | int optname, sockptr_t optval, sockptr_t optlen);
|
| 1894 |
|
| 1895 | int sk_getsockopt(struct sock *sk, int level, int optname,
|
| 1896 | sockptr_t optval, sockptr_t optlen);
|
| 1897 | int sock_gettstamp(struct socket *sock, void __user *userstamp,
|
| 1898 | bool timeval, bool time32);
|
| 1899 | struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
|
| 1900 | unsigned long data_len, int noblock,
|
| 1901 | int *errcode, int max_page_order);
|
| 1902 |
|
| 1903 | static inline struct sk_buff *sock_alloc_send_skb(struct sock *sk,
|
| 1904 | unsigned long size,
|
| 1905 | int noblock, int *errcode)
|
| 1906 | {
|
| 1907 | return sock_alloc_send_pskb(sk, size, 0, noblock, errcode, 0);
|
| 1908 | }
|
| 1909 |
|
| 1910 | void *sock_kmalloc(struct sock *sk, int size, gfp_t priority);
|
| 1911 | void *sock_kmemdup(struct sock *sk, const void *src,
|
| 1912 | int size, gfp_t priority);
|
| 1913 | void sock_kfree_s(struct sock *sk, void *mem, int size);
|
| 1914 | void sock_kzfree_s(struct sock *sk, void *mem, int size);
|
| 1915 | void sk_send_sigurg(struct sock *sk);
|
| 1916 |
|
| 1917 | static inline void sock_replace_proto(struct sock *sk, struct proto *proto)
|
| 1918 | {
|
| 1919 | if (sk->sk_socket)
|
| 1920 | clear_bit(SOCK_SUPPORT_ZC, &sk->sk_socket->flags);
|
| 1921 | WRITE_ONCE(sk->sk_prot, proto);
|
| 1922 | }
|
| 1923 |
|
| 1924 | struct sockcm_cookie {
|
| 1925 | u64 transmit_time;
|
| 1926 | u32 mark;
|
| 1927 | u32 tsflags;
|
| 1928 | u32 ts_opt_id;
|
| 1929 | u32 priority;
|
| 1930 | u32 dmabuf_id;
|
| 1931 | };
|
| 1932 |
|
| 1933 | static inline void sockcm_init(struct sockcm_cookie *sockc,
|
| 1934 | const struct sock *sk)
|
| 1935 | {
|
| 1936 | *sockc = (struct sockcm_cookie) {
|
| 1937 | .mark = READ_ONCE(sk->sk_mark),
|
| 1938 | .tsflags = READ_ONCE(sk->sk_tsflags),
|
| 1939 | .priority = READ_ONCE(sk->sk_priority),
|
| 1940 | };
|
| 1941 | }
|
| 1942 |
|
| 1943 | int __sock_cmsg_send(struct sock *sk, struct cmsghdr *cmsg,
|
| 1944 | struct sockcm_cookie *sockc);
|
| 1945 | int sock_cmsg_send(struct sock *sk, struct msghdr *msg,
|
| 1946 | struct sockcm_cookie *sockc);
|
| 1947 |
|
| 1948 | |
| 1949 | * Functions to fill in entries in struct proto_ops when a protocol
|
| 1950 | * does not implement a particular function.
|
| 1951 |
|
| 1952 | int sock_no_bind(struct socket *sock, struct sockaddr_unsized *saddr, int len);
|
| 1953 | int sock_no_connect(struct socket *sock, struct sockaddr_unsized *saddr, int len, int flags);
|
| 1954 | int sock_no_socketpair(struct socket *, struct socket *);
|
| 1955 | int sock_no_accept(struct socket *, struct socket *, struct proto_accept_arg *);
|
| 1956 | int sock_no_getname(struct socket *, struct sockaddr *, int);
|
| 1957 | int sock_no_ioctl(struct socket *, unsigned int, unsigned long);
|
| 1958 | int sock_no_listen(struct socket *, int);
|
| 1959 | int sock_no_shutdown(struct socket *, int);
|
| 1960 | int sock_no_sendmsg(struct socket *, struct msghdr *, size_t);
|
| 1961 | int sock_no_sendmsg_locked(struct sock *sk, struct msghdr *msg, size_t len);
|
| 1962 | int sock_no_recvmsg(struct socket *, struct msghdr *, size_t, int);
|
| 1963 | int sock_no_mmap(struct file *file, struct socket *sock,
|
| 1964 | struct vm_area_struct *vma);
|
| 1965 |
|
| 1966 | |
| 1967 | * Functions to fill in entries in struct proto_ops when a protocol
|
| 1968 | * uses the inet style.
|
| 1969 |
|
| 1970 | int sock_common_getsockopt(struct socket *sock, int level, int optname,
|
| 1971 | char __user *optval, int __user *optlen);
|
| 1972 | int sock_common_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
|
| 1973 | int flags);
|
| 1974 | int sock_common_setsockopt(struct socket *sock, int level, int optname,
|
| 1975 | sockptr_t optval, unsigned int optlen);
|
| 1976 |
|
| 1977 | void sk_common_release(struct sock *sk);
|
| 1978 |
|
| 1979 | |
| 1980 | * Default socket callbacks and setup code
|
| 1981 |
|
| 1982 |
|
| 1983 |
|
| 1984 | void sock_init_data_uid(struct socket *sock, struct sock *sk, kuid_t uid);
|
| 1985 |
|
| 1986 | |
| 1987 | * Assumes struct socket *sock is embedded in a struct socket_alloc.
|
| 1988 |
|
| 1989 | void sock_init_data(struct socket *sock, struct sock *sk);
|
| 1990 |
|
| 1991 | |
| 1992 | * Socket reference counting postulates.
|
| 1993 | *
|
| 1994 | * * Each user of socket SHOULD hold a reference count.
|
| 1995 | * * Each access point to socket (an hash table bucket, reference from a list,
|
| 1996 | * running timer, skb in flight MUST hold a reference count.
|
| 1997 | * * When reference count hits 0, it means it will never increase back.
|
| 1998 | * * When reference count hits 0, it means that no references from
|
| 1999 | * outside exist to this socket and current process on current CPU
|
| 2000 | * is last user and may/should destroy this socket.
|
| 2001 | * * sk_free is called from any context: process, BH, IRQ. When
|
| 2002 | * it is called, socket has no references from outside -> sk_free
|
| 2003 | * may release descendant resources allocated by the socket, but
|
| 2004 | * to the time when it is called, socket is NOT referenced by any
|
| 2005 | * hash tables, lists etc.
|
| 2006 | * * Packets, delivered from outside (from network or from another process)
|
| 2007 | * and enqueued on receive/error queues SHOULD NOT grab reference count,
|
| 2008 | * when they sit in queue. Otherwise, packets will leak to hole, when
|
| 2009 | * socket is looked up by one cpu and unhasing is made by another CPU.
|
| 2010 | * It is true for udp/raw, netlink (leak to receive and error queues), tcp
|
| 2011 | * (leak to backlog). Packet socket does all the processing inside
|
| 2012 | * BR_NETPROTO_LOCK, so that it has not this race condition. UNIX sockets
|
| 2013 | * use separate SMP lock, so that they are prone too.
|
| 2014 |
|
| 2015 |
|
| 2016 |
|
| 2017 | static inline void sock_put(struct sock *sk)
|
| 2018 | {
|
| 2019 | if (refcount_dec_and_test(&sk->sk_refcnt))
|
| 2020 | sk_free(sk);
|
| 2021 | }
|
| 2022 | |
| 2023 | * (TCP_TIMEWAIT, TCP_NEW_SYN_RECV, ESTABLISHED...)
|
| 2024 |
|
| 2025 | void sock_gen_put(struct sock *sk);
|
| 2026 |
|
| 2027 | int __sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested,
|
| 2028 | unsigned int trim_cap, bool refcounted);
|
| 2029 | static inline int sk_receive_skb(struct sock *sk, struct sk_buff *skb,
|
| 2030 | const int nested)
|
| 2031 | {
|
| 2032 | return __sk_receive_skb(sk, skb, nested, 1, true);
|
| 2033 | }
|
| 2034 |
|
| 2035 | static inline void sk_tx_queue_set(struct sock *sk, int tx_queue)
|
| 2036 | {
|
| 2037 |
|
| 2038 | if (WARN_ON_ONCE((unsigned short)tx_queue >= USHRT_MAX))
|
| 2039 | return;
|
| 2040 | |
| 2041 | * other WRITE_ONCE() because socket lock might be not held.
|
| 2042 |
|
| 2043 | if (READ_ONCE(sk->sk_tx_queue_mapping) != tx_queue) {
|
| 2044 | WRITE_ONCE(sk->sk_tx_queue_mapping, tx_queue);
|
| 2045 | WRITE_ONCE(sk->sk_tx_queue_mapping_jiffies, jiffies);
|
| 2046 | return;
|
| 2047 | }
|
| 2048 |
|
| 2049 |
|
| 2050 | if (time_is_before_jiffies(READ_ONCE(sk->sk_tx_queue_mapping_jiffies) + HZ))
|
| 2051 | WRITE_ONCE(sk->sk_tx_queue_mapping_jiffies, jiffies);
|
| 2052 | }
|
| 2053 |
|
| 2054 | #define NO_QUEUE_MAPPING USHRT_MAX
|
| 2055 |
|
| 2056 | static inline void sk_tx_queue_clear(struct sock *sk)
|
| 2057 | {
|
| 2058 | |
| 2059 | * other WRITE_ONCE() because socket lock might be not held.
|
| 2060 |
|
| 2061 | WRITE_ONCE(sk->sk_tx_queue_mapping, NO_QUEUE_MAPPING);
|
| 2062 | }
|
| 2063 |
|
| 2064 | int sk_tx_queue_get(const struct sock *sk);
|
| 2065 |
|
| 2066 | static inline void __sk_rx_queue_set(struct sock *sk,
|
| 2067 | const struct sk_buff *skb,
|
| 2068 | bool force_set)
|
| 2069 | {
|
| 2070 | #ifdef CONFIG_SOCK_RX_QUEUE_MAPPING
|
| 2071 | if (skb_rx_queue_recorded(skb)) {
|
| 2072 | u16 rx_queue = skb_get_rx_queue(skb);
|
| 2073 |
|
| 2074 | if (force_set ||
|
| 2075 | unlikely(READ_ONCE(sk->sk_rx_queue_mapping) != rx_queue))
|
| 2076 | WRITE_ONCE(sk->sk_rx_queue_mapping, rx_queue);
|
| 2077 | }
|
| 2078 | #endif
|
| 2079 | }
|
| 2080 |
|
| 2081 | static inline void sk_rx_queue_set(struct sock *sk, const struct sk_buff *skb)
|
| 2082 | {
|
| 2083 | __sk_rx_queue_set(sk, skb, true);
|
| 2084 | }
|
| 2085 |
|
| 2086 | static inline void sk_rx_queue_update(struct sock *sk, const struct sk_buff *skb)
|
| 2087 | {
|
| 2088 | __sk_rx_queue_set(sk, skb, false);
|
| 2089 | }
|
| 2090 |
|
| 2091 | static inline void sk_rx_queue_clear(struct sock *sk)
|
| 2092 | {
|
| 2093 | #ifdef CONFIG_SOCK_RX_QUEUE_MAPPING
|
| 2094 | WRITE_ONCE(sk->sk_rx_queue_mapping, NO_QUEUE_MAPPING);
|
| 2095 | #endif
|
| 2096 | }
|
| 2097 |
|
| 2098 | static inline int sk_rx_queue_get(const struct sock *sk)
|
| 2099 | {
|
| 2100 | #ifdef CONFIG_SOCK_RX_QUEUE_MAPPING
|
| 2101 | if (sk) {
|
| 2102 | int res = READ_ONCE(sk->sk_rx_queue_mapping);
|
| 2103 |
|
| 2104 | if (res != NO_QUEUE_MAPPING)
|
| 2105 | return res;
|
| 2106 | }
|
| 2107 | #endif
|
| 2108 |
|
| 2109 | return -1;
|
| 2110 | }
|
| 2111 |
|
| 2112 | static inline void sk_set_socket(struct sock *sk, struct socket *sock)
|
| 2113 | {
|
| 2114 | WRITE_ONCE(sk->sk_socket, sock);
|
| 2115 | if (sock) {
|
| 2116 | WRITE_ONCE(sk->sk_uid, SOCK_INODE(sock)->i_uid);
|
| 2117 | WRITE_ONCE(sk->sk_ino, SOCK_INODE(sock)->i_ino);
|
| 2118 | } else {
|
| 2119 |
|
| 2120 | WRITE_ONCE(sk->sk_ino, 0);
|
| 2121 | }
|
| 2122 | }
|
| 2123 |
|
| 2124 | static inline wait_queue_head_t *sk_sleep(struct sock *sk)
|
| 2125 | {
|
| 2126 | BUILD_BUG_ON(offsetof(struct socket_wq, wait) != 0);
|
| 2127 | return &rcu_dereference_raw(sk->sk_wq)->wait;
|
| 2128 | }
|
| 2129 | |
| 2130 | * Announce socket dead, detach it from wait queue and inode.
|
| 2131 | * Note that parent inode held reference count on this struct sock,
|
| 2132 | * we do not release it in this function, because protocol
|
| 2133 | * probably wants some additional cleanups or even continuing
|
| 2134 | * to work with this socket (TCP).
|
| 2135 |
|
| 2136 | static inline void sock_orphan(struct sock *sk)
|
| 2137 | {
|
| 2138 | write_lock_bh(&sk->sk_callback_lock);
|
| 2139 | sock_set_flag(sk, SOCK_DEAD);
|
| 2140 | sk_set_socket(sk, NULL);
|
| 2141 | sk->sk_wq = NULL;
|
| 2142 | write_unlock_bh(&sk->sk_callback_lock);
|
| 2143 | }
|
| 2144 |
|
| 2145 | static inline void sock_graft(struct sock *sk, struct socket *parent)
|
| 2146 | {
|
| 2147 | WARN_ON(parent->sk);
|
| 2148 | write_lock_bh(&sk->sk_callback_lock);
|
| 2149 | rcu_assign_pointer(sk->sk_wq, &parent->wq);
|
| 2150 | parent->sk = sk;
|
| 2151 | sk_set_socket(sk, parent);
|
| 2152 | security_sock_graft(sk, parent);
|
| 2153 | write_unlock_bh(&sk->sk_callback_lock);
|
| 2154 | }
|
| 2155 |
|
| 2156 | static inline u64 sock_i_ino(const struct sock *sk)
|
| 2157 | {
|
| 2158 |
|
| 2159 | return READ_ONCE(sk->sk_ino);
|
| 2160 | }
|
| 2161 |
|
| 2162 | static inline kuid_t sk_uid(const struct sock *sk)
|
| 2163 | {
|
| 2164 |
|
| 2165 | return READ_ONCE(sk->sk_uid);
|
| 2166 | }
|
| 2167 |
|
| 2168 | static inline kuid_t sock_net_uid(const struct net *net, const struct sock *sk)
|
| 2169 | {
|
| 2170 | return sk ? sk_uid(sk) : make_kuid(net->user_ns, 0);
|
| 2171 | }
|
| 2172 |
|
| 2173 | static inline u32 net_tx_rndhash(void)
|
| 2174 | {
|
| 2175 | u32 v = get_random_u32();
|
| 2176 |
|
| 2177 | return v ?: 1;
|
| 2178 | }
|
| 2179 |
|
| 2180 | static inline void sk_set_txhash(struct sock *sk)
|
| 2181 | {
|
| 2182 |
|
| 2183 | WRITE_ONCE(sk->sk_txhash, net_tx_rndhash());
|
| 2184 | }
|
| 2185 |
|
| 2186 | static inline bool sk_rethink_txhash(struct sock *sk)
|
| 2187 | {
|
| 2188 | if (sk->sk_txhash && sk->sk_txrehash == SOCK_TXREHASH_ENABLED) {
|
| 2189 | sk_set_txhash(sk);
|
| 2190 | return true;
|
| 2191 | }
|
| 2192 | return false;
|
| 2193 | }
|
| 2194 |
|
| 2195 | static inline struct dst_entry *
|
| 2196 | __sk_dst_get(const struct sock *sk)
|
| 2197 | {
|
| 2198 | return rcu_dereference_check(sk->sk_dst_cache,
|
| 2199 | lockdep_sock_is_held(sk));
|
| 2200 | }
|
| 2201 |
|
| 2202 | static inline struct dst_entry *
|
| 2203 | sk_dst_get(const struct sock *sk)
|
| 2204 | {
|
| 2205 | struct dst_entry *dst;
|
| 2206 |
|
| 2207 | rcu_read_lock();
|
| 2208 | dst = rcu_dereference(sk->sk_dst_cache);
|
| 2209 | if (dst && !rcuref_get(&dst->__rcuref))
|
| 2210 | dst = NULL;
|
| 2211 | rcu_read_unlock();
|
| 2212 | return dst;
|
| 2213 | }
|
| 2214 |
|
| 2215 | static inline void __dst_negative_advice(struct sock *sk)
|
| 2216 | {
|
| 2217 | struct dst_entry *dst = __sk_dst_get(sk);
|
| 2218 |
|
| 2219 | if (dst && dst->ops->negative_advice)
|
| 2220 | dst->ops->negative_advice(sk, dst);
|
| 2221 | }
|
| 2222 |
|
| 2223 | static inline void dst_negative_advice(struct sock *sk)
|
| 2224 | {
|
| 2225 | sk_rethink_txhash(sk);
|
| 2226 | __dst_negative_advice(sk);
|
| 2227 | }
|
| 2228 |
|
| 2229 | static inline void
|
| 2230 | __sk_dst_set(struct sock *sk, struct dst_entry *dst)
|
| 2231 | {
|
| 2232 | struct dst_entry *old_dst;
|
| 2233 |
|
| 2234 | sk_tx_queue_clear(sk);
|
| 2235 | WRITE_ONCE(sk->sk_dst_pending_confirm, 0);
|
| 2236 | old_dst = rcu_dereference_protected(sk->sk_dst_cache,
|
| 2237 | lockdep_sock_is_held(sk));
|
| 2238 | rcu_assign_pointer(sk->sk_dst_cache, dst);
|
| 2239 | dst_release(old_dst);
|
| 2240 | }
|
| 2241 |
|
| 2242 | static inline void
|
| 2243 | sk_dst_set(struct sock *sk, struct dst_entry *dst)
|
| 2244 | {
|
| 2245 | struct dst_entry *old_dst;
|
| 2246 |
|
| 2247 | sk_tx_queue_clear(sk);
|
| 2248 | WRITE_ONCE(sk->sk_dst_pending_confirm, 0);
|
| 2249 | old_dst = unrcu_pointer(xchg(&sk->sk_dst_cache, RCU_INITIALIZER(dst)));
|
| 2250 | dst_release(old_dst);
|
| 2251 | }
|
| 2252 |
|
| 2253 | static inline void
|
| 2254 | __sk_dst_reset(struct sock *sk)
|
| 2255 | {
|
| 2256 | __sk_dst_set(sk, NULL);
|
| 2257 | }
|
| 2258 |
|
| 2259 | static inline void
|
| 2260 | sk_dst_reset(struct sock *sk)
|
| 2261 | {
|
| 2262 | sk_dst_set(sk, NULL);
|
| 2263 | }
|
| 2264 |
|
| 2265 | |
| 2266 | * so the next transmit re-selects an ECMP path; IPv4 keeps its route, since
|
| 2267 | * IPv4 ECMP path selection does not use sk_txhash.
|
| 2268 |
|
| 2269 | static inline bool __sk_rethink_txhash_reset_dst(struct sock *sk)
|
| 2270 | {
|
| 2271 | if (sk_rethink_txhash(sk)) {
|
| 2272 | if (sk->sk_family == AF_INET6)
|
| 2273 | __sk_dst_reset(sk);
|
| 2274 | return true;
|
| 2275 | }
|
| 2276 | return false;
|
| 2277 | }
|
| 2278 |
|
| 2279 | struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie);
|
| 2280 |
|
| 2281 | struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie);
|
| 2282 |
|
| 2283 | static inline void sk_dst_confirm(struct sock *sk)
|
| 2284 | {
|
| 2285 | if (!READ_ONCE(sk->sk_dst_pending_confirm))
|
| 2286 | WRITE_ONCE(sk->sk_dst_pending_confirm, 1);
|
| 2287 | }
|
| 2288 |
|
| 2289 | static inline void sock_confirm_neigh(struct sk_buff *skb, struct neighbour *n)
|
| 2290 | {
|
| 2291 | if (skb_get_dst_pending_confirm(skb)) {
|
| 2292 | struct sock *sk = skb->sk;
|
| 2293 |
|
| 2294 | if (sk && READ_ONCE(sk->sk_dst_pending_confirm))
|
| 2295 | WRITE_ONCE(sk->sk_dst_pending_confirm, 0);
|
| 2296 | neigh_confirm(n);
|
| 2297 | }
|
| 2298 | }
|
| 2299 |
|
| 2300 | bool sk_mc_loop(const struct sock *sk);
|
| 2301 |
|
| 2302 | static inline bool sk_can_gso(const struct sock *sk)
|
| 2303 | {
|
| 2304 | return net_gso_ok(sk->sk_route_caps, sk->sk_gso_type);
|
| 2305 | }
|
| 2306 |
|
| 2307 | void sk_setup_caps(struct sock *sk, struct dst_entry *dst);
|
| 2308 |
|
| 2309 | static inline void sk_gso_disable(struct sock *sk)
|
| 2310 | {
|
| 2311 | sk->sk_gso_disabled = 1;
|
| 2312 | sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
|
| 2313 | }
|
| 2314 |
|
| 2315 | bool sk_has_decrypt_user(const struct sock *sk);
|
| 2316 |
|
| 2317 | static inline int skb_do_copy_data_nocache(struct sock *sk, struct sk_buff *skb,
|
| 2318 | struct iov_iter *from, char *to,
|
| 2319 | int copy, int offset)
|
| 2320 | {
|
| 2321 | if (skb->ip_summed == CHECKSUM_NONE) {
|
| 2322 | __wsum csum = 0;
|
| 2323 | if (!csum_and_copy_from_iter_full(to, copy, &csum, from))
|
| 2324 | return -EFAULT;
|
| 2325 | skb->csum = csum_block_add(skb->csum, csum, offset);
|
| 2326 | } else if (sk->sk_route_caps & NETIF_F_NOCACHE_COPY) {
|
| 2327 | if (!copy_from_iter_full_nocache(to, copy, from))
|
| 2328 | return -EFAULT;
|
| 2329 | } else if (!copy_from_iter_full(to, copy, from))
|
| 2330 | return -EFAULT;
|
| 2331 |
|
| 2332 | return 0;
|
| 2333 | }
|
| 2334 |
|
| 2335 | static inline int skb_add_data_nocache(struct sock *sk, struct sk_buff *skb,
|
| 2336 | struct iov_iter *from, int copy)
|
| 2337 | {
|
| 2338 | int err, offset = skb->len;
|
| 2339 |
|
| 2340 | err = skb_do_copy_data_nocache(sk, skb, from, skb_put(skb, copy),
|
| 2341 | copy, offset);
|
| 2342 | if (err)
|
| 2343 | __skb_trim(skb, offset);
|
| 2344 |
|
| 2345 | return err;
|
| 2346 | }
|
| 2347 |
|
| 2348 | static inline int skb_copy_to_page_nocache(struct sock *sk, struct iov_iter *from,
|
| 2349 | struct sk_buff *skb,
|
| 2350 | struct page *page,
|
| 2351 | int off, int copy)
|
| 2352 | {
|
| 2353 | int err;
|
| 2354 |
|
| 2355 | err = skb_do_copy_data_nocache(sk, skb, from, page_address(page) + off,
|
| 2356 | copy, skb->len);
|
| 2357 | if (err)
|
| 2358 | return err;
|
| 2359 |
|
| 2360 | skb_len_add(skb, copy);
|
| 2361 | sk_wmem_queued_add(sk, copy);
|
| 2362 | sk_mem_charge(sk, copy);
|
| 2363 | return 0;
|
| 2364 | }
|
| 2365 |
|
| 2366 | #define SK_WMEM_ALLOC_BIAS 1
|
| 2367 | |
| 2368 | * sk_wmem_alloc_get - returns write allocations
|
| 2369 | * @sk: socket
|
| 2370 | *
|
| 2371 | * Return: sk_wmem_alloc minus initial offset of one
|
| 2372 |
|
| 2373 | static inline int sk_wmem_alloc_get(const struct sock *sk)
|
| 2374 | {
|
| 2375 | return refcount_read(&sk->sk_wmem_alloc) - SK_WMEM_ALLOC_BIAS;
|
| 2376 | }
|
| 2377 |
|
| 2378 | |
| 2379 | * sk_rmem_alloc_get - returns read allocations
|
| 2380 | * @sk: socket
|
| 2381 | *
|
| 2382 | * Return: sk_rmem_alloc
|
| 2383 |
|
| 2384 | static inline int sk_rmem_alloc_get(const struct sock *sk)
|
| 2385 | {
|
| 2386 | return atomic_read(&sk->sk_rmem_alloc);
|
| 2387 | }
|
| 2388 |
|
| 2389 | |
| 2390 | * sk_has_allocations - check if allocations are outstanding
|
| 2391 | * @sk: socket
|
| 2392 | *
|
| 2393 | * Return: true if socket has write or read allocations
|
| 2394 |
|
| 2395 | static inline bool sk_has_allocations(const struct sock *sk)
|
| 2396 | {
|
| 2397 | return sk_wmem_alloc_get(sk) || sk_rmem_alloc_get(sk);
|
| 2398 | }
|
| 2399 |
|
| 2400 | |
| 2401 | * skwq_has_sleeper - check if there are any waiting processes
|
| 2402 | * @wq: struct socket_wq
|
| 2403 | *
|
| 2404 | * Return: true if socket_wq has waiting processes
|
| 2405 | *
|
| 2406 | * The purpose of the skwq_has_sleeper and sock_poll_wait is to wrap the memory
|
| 2407 | * barrier call. They were added due to the race found within the tcp code.
|
| 2408 | *
|
| 2409 | * Consider following tcp code paths::
|
| 2410 | *
|
| 2411 | * CPU1 CPU2
|
| 2412 | * sys_select receive packet
|
| 2413 | * ... ...
|
| 2414 | * __add_wait_queue update tp->rcv_nxt
|
| 2415 | * ... ...
|
| 2416 | * tp->rcv_nxt check sock_def_readable
|
| 2417 | * ... {
|
| 2418 | * schedule rcu_read_lock();
|
| 2419 | * wq = rcu_dereference(sk->sk_wq);
|
| 2420 | * if (wq && waitqueue_active(&wq->wait))
|
| 2421 | * wake_up_interruptible(&wq->wait)
|
| 2422 | * ...
|
| 2423 | * }
|
| 2424 | *
|
| 2425 | * The race for tcp fires when the __add_wait_queue changes done by CPU1 stay
|
| 2426 | * in its cache, and so does the tp->rcv_nxt update on CPU2 side. The CPU1
|
| 2427 | * could then endup calling schedule and sleep forever if there are no more
|
| 2428 | * data on the socket.
|
| 2429 | *
|
| 2430 |
|
| 2431 | static inline bool skwq_has_sleeper(struct socket_wq *wq)
|
| 2432 | {
|
| 2433 | return wq && wq_has_sleeper(&wq->wait);
|
| 2434 | }
|
| 2435 |
|
| 2436 | |
| 2437 | * sock_poll_wait - wrapper for the poll_wait call.
|
| 2438 | * @filp: file
|
| 2439 | * @sock: socket to wait on
|
| 2440 | * @p: poll_table
|
| 2441 | *
|
| 2442 | * See the comments in the wq_has_sleeper function.
|
| 2443 |
|
| 2444 | static inline void sock_poll_wait(struct file *filp, struct socket *sock,
|
| 2445 | poll_table *p)
|
| 2446 | {
|
| 2447 | |
| 2448 | * with the socket flags modification.
|
| 2449 | *
|
| 2450 | * This memory barrier is paired in the wq_has_sleeper.
|
| 2451 |
|
| 2452 | poll_wait(filp, &sock->wq.wait, p);
|
| 2453 | }
|
| 2454 |
|
| 2455 | static inline void skb_set_hash_from_sk(struct sk_buff *skb, struct sock *sk)
|
| 2456 | {
|
| 2457 |
|
| 2458 | u32 txhash = READ_ONCE(sk->sk_txhash);
|
| 2459 |
|
| 2460 | if (txhash) {
|
| 2461 | skb->l4_hash = 1;
|
| 2462 | skb->hash = txhash;
|
| 2463 | }
|
| 2464 | }
|
| 2465 |
|
| 2466 | void skb_set_owner_w(struct sk_buff *skb, struct sock *sk);
|
| 2467 |
|
| 2468 | |
| 2469 | * Queue a received datagram if it will fit. Stream and sequenced
|
| 2470 | * protocols can't normally use this as they need to fit buffers in
|
| 2471 | * and play with them.
|
| 2472 | *
|
| 2473 | * Inlined as it's very short and called for pretty much every
|
| 2474 | * packet ever received.
|
| 2475 |
|
| 2476 | static inline void skb_set_owner_r(struct sk_buff *skb, struct sock *sk)
|
| 2477 | {
|
| 2478 | skb_orphan(skb);
|
| 2479 | skb->sk = sk;
|
| 2480 | skb->destructor = sock_rfree;
|
| 2481 | atomic_add(skb->truesize, &sk->sk_rmem_alloc);
|
| 2482 | sk_mem_charge(sk, skb->truesize);
|
| 2483 | }
|
| 2484 |
|
| 2485 | static inline __must_check bool skb_set_owner_sk_safe(struct sk_buff *skb, struct sock *sk)
|
| 2486 | {
|
| 2487 | if (sk && refcount_inc_not_zero(&sk->sk_refcnt)) {
|
| 2488 | skb_orphan(skb);
|
| 2489 | skb->destructor = sock_efree;
|
| 2490 | skb->sk = sk;
|
| 2491 | return true;
|
| 2492 | }
|
| 2493 | return false;
|
| 2494 | }
|
| 2495 |
|
| 2496 | static inline struct sk_buff *skb_clone_and_charge_r(struct sk_buff *skb, struct sock *sk)
|
| 2497 | {
|
| 2498 | skb = skb_clone(skb, sk_gfp_mask(sk, GFP_ATOMIC));
|
| 2499 | if (skb) {
|
| 2500 | if (sk_rmem_schedule(sk, skb, skb->truesize)) {
|
| 2501 | skb_set_owner_r(skb, sk);
|
| 2502 | return skb;
|
| 2503 | }
|
| 2504 | __kfree_skb(skb);
|
| 2505 | }
|
| 2506 | return NULL;
|
| 2507 | }
|
| 2508 |
|
| 2509 | static inline void skb_prepare_for_gro(struct sk_buff *skb)
|
| 2510 | {
|
| 2511 | if (skb->destructor != sock_wfree) {
|
| 2512 | skb_orphan(skb);
|
| 2513 | return;
|
| 2514 | }
|
| 2515 | skb->slow_gro = 1;
|
| 2516 | }
|
| 2517 |
|
| 2518 | void sk_reset_timer(struct sock *sk, struct timer_list *timer,
|
| 2519 | unsigned long expires);
|
| 2520 |
|
| 2521 | void sk_stop_timer(struct sock *sk, struct timer_list *timer);
|
| 2522 |
|
| 2523 | void sk_stop_timer_sync(struct sock *sk, struct timer_list *timer);
|
| 2524 |
|
| 2525 | int __sk_queue_drop_skb(struct sock *sk, struct sk_buff_head *sk_queue,
|
| 2526 | struct sk_buff *skb, unsigned int flags,
|
| 2527 | void (*destructor)(struct sock *sk,
|
| 2528 | struct sk_buff *skb));
|
| 2529 | int __sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb);
|
| 2530 |
|
| 2531 | enum skb_drop_reason
|
| 2532 | sock_queue_rcv_skb_reason(struct sock *sk, struct sk_buff *skb);
|
| 2533 |
|
| 2534 | static inline int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
|
| 2535 | {
|
| 2536 | enum skb_drop_reason drop_reason = sock_queue_rcv_skb_reason(sk, skb);
|
| 2537 |
|
| 2538 | switch (drop_reason) {
|
| 2539 | case SKB_DROP_REASON_SOCKET_RCVBUFF:
|
| 2540 | return -ENOMEM;
|
| 2541 | case SKB_DROP_REASON_PROTO_MEM:
|
| 2542 | return -ENOBUFS;
|
| 2543 | case 0:
|
| 2544 | return 0;
|
| 2545 | default:
|
| 2546 | return -EPERM;
|
| 2547 | }
|
| 2548 | }
|
| 2549 |
|
| 2550 | int sock_queue_err_skb(struct sock *sk, struct sk_buff *skb);
|
| 2551 | struct sk_buff *sock_dequeue_err_skb(struct sock *sk);
|
| 2552 |
|
| 2553 | |
| 2554 | * Recover an error report and clear atomically
|
| 2555 |
|
| 2556 |
|
| 2557 | static inline int sock_error(struct sock *sk)
|
| 2558 | {
|
| 2559 | int err;
|
| 2560 |
|
| 2561 | |
| 2562 | * This is racy since another cpu/thread can change sk_err under us.
|
| 2563 |
|
| 2564 | if (likely(data_race(!sk->sk_err)))
|
| 2565 | return 0;
|
| 2566 |
|
| 2567 | err = xchg(&sk->sk_err, 0);
|
| 2568 | return -err;
|
| 2569 | }
|
| 2570 |
|
| 2571 | void sk_error_report(struct sock *sk);
|
| 2572 |
|
| 2573 | static inline unsigned long sock_wspace(struct sock *sk)
|
| 2574 | {
|
| 2575 | int amt = 0;
|
| 2576 |
|
| 2577 | if (!(sk->sk_shutdown & SEND_SHUTDOWN)) {
|
| 2578 | amt = sk->sk_sndbuf - refcount_read(&sk->sk_wmem_alloc);
|
| 2579 | if (amt < 0)
|
| 2580 | amt = 0;
|
| 2581 | }
|
| 2582 | return amt;
|
| 2583 | }
|
| 2584 |
|
| 2585 | |
| 2586 | * We use sk->sk_wq_raw, from contexts knowing this
|
| 2587 | * pointer is not NULL and cannot disappear/change.
|
| 2588 |
|
| 2589 | static inline void sk_set_bit(int nr, struct sock *sk)
|
| 2590 | {
|
| 2591 | if ((nr == SOCKWQ_ASYNC_NOSPACE || nr == SOCKWQ_ASYNC_WAITDATA) &&
|
| 2592 | !sock_flag(sk, SOCK_FASYNC))
|
| 2593 | return;
|
| 2594 |
|
| 2595 | set_bit(nr, &sk->sk_wq_raw->flags);
|
| 2596 | }
|
| 2597 |
|
| 2598 | static inline void sk_clear_bit(int nr, struct sock *sk)
|
| 2599 | {
|
| 2600 | if ((nr == SOCKWQ_ASYNC_NOSPACE || nr == SOCKWQ_ASYNC_WAITDATA) &&
|
| 2601 | !sock_flag(sk, SOCK_FASYNC))
|
| 2602 | return;
|
| 2603 |
|
| 2604 | clear_bit(nr, &sk->sk_wq_raw->flags);
|
| 2605 | }
|
| 2606 |
|
| 2607 | static inline void sk_wake_async(const struct sock *sk, int how, int band)
|
| 2608 | {
|
| 2609 | if (sock_flag(sk, SOCK_FASYNC)) {
|
| 2610 | rcu_read_lock();
|
| 2611 | sock_wake_async(rcu_dereference(sk->sk_wq), how, band);
|
| 2612 | rcu_read_unlock();
|
| 2613 | }
|
| 2614 | }
|
| 2615 |
|
| 2616 | static inline void sk_wake_async_rcu(const struct sock *sk, int how, int band)
|
| 2617 | {
|
| 2618 | if (unlikely(sock_flag(sk, SOCK_FASYNC)))
|
| 2619 | sock_wake_async(rcu_dereference(sk->sk_wq), how, band);
|
| 2620 | }
|
| 2621 |
|
| 2622 | |
| 2623 | * need sizeof(sk_buff) + MTU + padding, unless net driver perform copybreak.
|
| 2624 | * Note: for send buffers, TCP works better if we can build two skbs at
|
| 2625 | * minimum.
|
| 2626 |
|
| 2627 | #define TCP_SKB_MIN_TRUESIZE (2048 + SKB_DATA_ALIGN(sizeof(struct sk_buff)))
|
| 2628 |
|
| 2629 | #define SOCK_MIN_SNDBUF (TCP_SKB_MIN_TRUESIZE * 2)
|
| 2630 | #define SOCK_MIN_RCVBUF TCP_SKB_MIN_TRUESIZE
|
| 2631 |
|
| 2632 | static inline void sk_stream_moderate_sndbuf(struct sock *sk)
|
| 2633 | {
|
| 2634 | u32 val;
|
| 2635 |
|
| 2636 | if (sk->sk_userlocks & SOCK_SNDBUF_LOCK)
|
| 2637 | return;
|
| 2638 |
|
| 2639 | val = min(sk->sk_sndbuf, sk->sk_wmem_queued >> 1);
|
| 2640 | val = max_t(u32, val, sk_unused_reserved_mem(sk));
|
| 2641 |
|
| 2642 | WRITE_ONCE(sk->sk_sndbuf, max_t(u32, val, SOCK_MIN_SNDBUF));
|
| 2643 | }
|
| 2644 |
|
| 2645 | |
| 2646 | * sk_page_frag - return an appropriate page_frag
|
| 2647 | * @sk: socket
|
| 2648 | *
|
| 2649 | * Use the per task page_frag instead of the per socket one for
|
| 2650 | * optimization when we know that we're in process context and own
|
| 2651 | * everything that's associated with %current.
|
| 2652 | *
|
| 2653 | * Both direct reclaim and page faults can nest inside other
|
| 2654 | * socket operations and end up recursing into sk_page_frag()
|
| 2655 | * while it's already in use: explicitly avoid task page_frag
|
| 2656 | * when users disable sk_use_task_frag.
|
| 2657 | *
|
| 2658 | * Return: a per task page_frag if context allows that,
|
| 2659 | * otherwise a per socket one.
|
| 2660 |
|
| 2661 | static inline struct page_frag *sk_page_frag(struct sock *sk)
|
| 2662 | {
|
| 2663 | if (sk->sk_use_task_frag)
|
| 2664 | return ¤t->task_frag;
|
| 2665 |
|
| 2666 | return &sk->sk_frag;
|
| 2667 | }
|
| 2668 |
|
| 2669 | bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag);
|
| 2670 |
|
| 2671 | static inline bool __sock_writeable(const struct sock *sk, int wmem_alloc)
|
| 2672 | {
|
| 2673 | return wmem_alloc < (READ_ONCE(sk->sk_sndbuf) >> 1);
|
| 2674 | }
|
| 2675 | |
| 2676 | * Default write policy as shown to user space via poll/select/SIGIO
|
| 2677 |
|
| 2678 | static inline bool sock_writeable(const struct sock *sk)
|
| 2679 | {
|
| 2680 | return __sock_writeable(sk, refcount_read(&sk->sk_wmem_alloc));
|
| 2681 | }
|
| 2682 |
|
| 2683 | static inline gfp_t gfp_any(void)
|
| 2684 | {
|
| 2685 | return in_softirq() ? GFP_ATOMIC : GFP_KERNEL;
|
| 2686 | }
|
| 2687 |
|
| 2688 | static inline gfp_t gfp_memcg_charge(void)
|
| 2689 | {
|
| 2690 | return in_softirq() ? GFP_ATOMIC : GFP_KERNEL;
|
| 2691 | }
|
| 2692 |
|
| 2693 | #ifdef CONFIG_MEMCG
|
| 2694 | static inline struct mem_cgroup *mem_cgroup_from_sk(const struct sock *sk)
|
| 2695 | {
|
| 2696 | return sk->sk_memcg;
|
| 2697 | }
|
| 2698 |
|
| 2699 | static inline bool mem_cgroup_sk_enabled(const struct sock *sk)
|
| 2700 | {
|
| 2701 | return mem_cgroup_sockets_enabled && mem_cgroup_from_sk(sk);
|
| 2702 | }
|
| 2703 |
|
| 2704 | static inline bool mem_cgroup_sk_under_memory_pressure(const struct sock *sk)
|
| 2705 | {
|
| 2706 | struct mem_cgroup *memcg = mem_cgroup_from_sk(sk);
|
| 2707 |
|
| 2708 | #ifdef CONFIG_MEMCG_V1
|
| 2709 | if (!cgroup_subsys_on_dfl(memory_cgrp_subsys))
|
| 2710 | return !!memcg->tcpmem_pressure;
|
| 2711 | #endif
|
| 2712 |
|
| 2713 | do {
|
| 2714 | if (time_before64(get_jiffies_64(),
|
| 2715 | mem_cgroup_get_socket_pressure(memcg))) {
|
| 2716 | memcg_memory_event(mem_cgroup_from_sk(sk),
|
| 2717 | MEMCG_SOCK_THROTTLED);
|
| 2718 | return true;
|
| 2719 | }
|
| 2720 | } while ((memcg = parent_mem_cgroup(memcg)));
|
| 2721 |
|
| 2722 | return false;
|
| 2723 | }
|
| 2724 | #else
|
| 2725 | static inline struct mem_cgroup *mem_cgroup_from_sk(const struct sock *sk)
|
| 2726 | {
|
| 2727 | return NULL;
|
| 2728 | }
|
| 2729 |
|
| 2730 | static inline bool mem_cgroup_sk_enabled(const struct sock *sk)
|
| 2731 | {
|
| 2732 | return false;
|
| 2733 | }
|
| 2734 |
|
| 2735 | static inline bool mem_cgroup_sk_under_memory_pressure(const struct sock *sk)
|
| 2736 | {
|
| 2737 | return false;
|
| 2738 | }
|
| 2739 | #endif
|
| 2740 |
|
| 2741 | static inline long sock_rcvtimeo(const struct sock *sk, bool noblock)
|
| 2742 | {
|
| 2743 | return noblock ? 0 : READ_ONCE(sk->sk_rcvtimeo);
|
| 2744 | }
|
| 2745 |
|
| 2746 | static inline long sock_sndtimeo(const struct sock *sk, bool noblock)
|
| 2747 | {
|
| 2748 | return noblock ? 0 : READ_ONCE(sk->sk_sndtimeo);
|
| 2749 | }
|
| 2750 |
|
| 2751 | static inline int sock_rcvlowat(const struct sock *sk, int waitall, int len)
|
| 2752 | {
|
| 2753 | int v = waitall ? len : min_t(int, READ_ONCE(sk->sk_rcvlowat), len);
|
| 2754 |
|
| 2755 | return v ?: 1;
|
| 2756 | }
|
| 2757 |
|
| 2758 | |
| 2759 | * Compare this to poll().
|
| 2760 |
|
| 2761 | static inline int sock_intr_errno(long timeo)
|
| 2762 | {
|
| 2763 | return timeo == MAX_SCHEDULE_TIMEOUT ? -ERESTARTSYS : -EINTR;
|
| 2764 | }
|
| 2765 |
|
| 2766 | struct sock_skb_cb {
|
| 2767 | u32 dropcount;
|
| 2768 | };
|
| 2769 |
|
| 2770 | |
| 2771 | * using skb->cb[] would keep using it directly and utilize its
|
| 2772 | * alignment guarantee.
|
| 2773 |
|
| 2774 | #define SOCK_SKB_CB_OFFSET (sizeof_field(struct sk_buff, cb) - \
|
| 2775 | sizeof(struct sock_skb_cb))
|
| 2776 |
|
| 2777 | #define SOCK_SKB_CB(__skb) ((struct sock_skb_cb *)((__skb)->cb + \
|
| 2778 | SOCK_SKB_CB_OFFSET))
|
| 2779 |
|
| 2780 | #define sock_skb_cb_check_size(size) \
|
| 2781 | BUILD_BUG_ON((size) > SOCK_SKB_CB_OFFSET)
|
| 2782 |
|
| 2783 | static inline void sk_drops_add(struct sock *sk, int segs)
|
| 2784 | {
|
| 2785 | struct numa_drop_counters *ndc = sk->sk_drop_counters;
|
| 2786 |
|
| 2787 | if (ndc)
|
| 2788 | numa_drop_add(ndc, segs);
|
| 2789 | else
|
| 2790 | atomic_add(segs, &sk->sk_drops);
|
| 2791 | }
|
| 2792 |
|
| 2793 | static inline void sk_drops_inc(struct sock *sk)
|
| 2794 | {
|
| 2795 | sk_drops_add(sk, 1);
|
| 2796 | }
|
| 2797 |
|
| 2798 | static inline int sk_drops_read(const struct sock *sk)
|
| 2799 | {
|
| 2800 | const struct numa_drop_counters *ndc = sk->sk_drop_counters;
|
| 2801 |
|
| 2802 | if (ndc) {
|
| 2803 | DEBUG_NET_WARN_ON_ONCE(atomic_read(&sk->sk_drops));
|
| 2804 | return numa_drop_read(ndc);
|
| 2805 | }
|
| 2806 | return atomic_read(&sk->sk_drops);
|
| 2807 | }
|
| 2808 |
|
| 2809 | static inline void sk_drops_reset(struct sock *sk)
|
| 2810 | {
|
| 2811 | struct numa_drop_counters *ndc = sk->sk_drop_counters;
|
| 2812 |
|
| 2813 | if (ndc)
|
| 2814 | numa_drop_reset(ndc);
|
| 2815 | atomic_set(&sk->sk_drops, 0);
|
| 2816 | }
|
| 2817 |
|
| 2818 | static inline void
|
| 2819 | sock_skb_set_dropcount(const struct sock *sk, struct sk_buff *skb)
|
| 2820 | {
|
| 2821 | SOCK_SKB_CB(skb)->dropcount = sock_flag(sk, SOCK_RXQ_OVFL) ?
|
| 2822 | sk_drops_read(sk) : 0;
|
| 2823 | }
|
| 2824 |
|
| 2825 | static inline void sk_drops_skbadd(struct sock *sk, const struct sk_buff *skb)
|
| 2826 | {
|
| 2827 | int segs = max_t(u16, 1, skb_shinfo(skb)->gso_segs);
|
| 2828 |
|
| 2829 | sk_drops_add(sk, segs);
|
| 2830 | }
|
| 2831 |
|
| 2832 | static inline ktime_t sock_read_timestamp(struct sock *sk)
|
| 2833 | {
|
| 2834 | #if BITS_PER_LONG==32
|
| 2835 | unsigned int seq;
|
| 2836 | ktime_t kt;
|
| 2837 |
|
| 2838 | do {
|
| 2839 | seq = read_seqbegin(&sk->sk_stamp_seq);
|
| 2840 | kt = sk->sk_stamp;
|
| 2841 | } while (read_seqretry(&sk->sk_stamp_seq, seq));
|
| 2842 |
|
| 2843 | return kt;
|
| 2844 | #else
|
| 2845 | return READ_ONCE(sk->sk_stamp);
|
| 2846 | #endif
|
| 2847 | }
|
| 2848 |
|
| 2849 | static inline void sock_write_timestamp(struct sock *sk, ktime_t kt)
|
| 2850 | {
|
| 2851 | #if BITS_PER_LONG==32
|
| 2852 | write_seqlock(&sk->sk_stamp_seq);
|
| 2853 | sk->sk_stamp = kt;
|
| 2854 | write_sequnlock(&sk->sk_stamp_seq);
|
| 2855 | #else
|
| 2856 | WRITE_ONCE(sk->sk_stamp, kt);
|
| 2857 | #endif
|
| 2858 | }
|
| 2859 |
|
| 2860 | void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk,
|
| 2861 | struct sk_buff *skb);
|
| 2862 | void __sock_recv_wifi_status(struct msghdr *msg, struct sock *sk,
|
| 2863 | struct sk_buff *skb);
|
| 2864 |
|
| 2865 | bool skb_has_tx_timestamp(struct sk_buff *skb, const struct sock *sk);
|
| 2866 | int skb_get_tx_timestamp(struct sk_buff *skb, struct sock *sk,
|
| 2867 | struct timespec64 *ts);
|
| 2868 |
|
| 2869 | static inline void
|
| 2870 | sock_recv_timestamp(struct msghdr *msg, struct sock *sk, struct sk_buff *skb)
|
| 2871 | {
|
| 2872 | struct skb_shared_hwtstamps *hwtstamps = skb_hwtstamps(skb);
|
| 2873 | u32 tsflags = READ_ONCE(sk->sk_tsflags);
|
| 2874 | ktime_t kt = skb->tstamp;
|
| 2875 | |
| 2876 | * generate control messages if
|
| 2877 | * - receive time stamping in software requested
|
| 2878 | * - software time stamp available and wanted
|
| 2879 | * - hardware time stamps available and wanted
|
| 2880 |
|
| 2881 | if (sock_flag(sk, SOCK_RCVTSTAMP) ||
|
| 2882 | (tsflags & SOF_TIMESTAMPING_RX_SOFTWARE) ||
|
| 2883 | (kt && tsflags & SOF_TIMESTAMPING_SOFTWARE) ||
|
| 2884 | (hwtstamps->hwtstamp &&
|
| 2885 | (tsflags & SOF_TIMESTAMPING_RAW_HARDWARE)))
|
| 2886 | __sock_recv_timestamp(msg, sk, skb);
|
| 2887 | else
|
| 2888 | sock_write_timestamp(sk, kt);
|
| 2889 |
|
| 2890 | if (sock_flag(sk, SOCK_WIFI_STATUS) && skb_wifi_acked_valid(skb))
|
| 2891 | __sock_recv_wifi_status(msg, sk, skb);
|
| 2892 | }
|
| 2893 |
|
| 2894 | void __sock_recv_cmsgs(struct msghdr *msg, struct sock *sk,
|
| 2895 | struct sk_buff *skb);
|
| 2896 |
|
| 2897 | #define SK_DEFAULT_STAMP (-1L * NSEC_PER_SEC)
|
| 2898 | static inline void sock_recv_cmsgs(struct msghdr *msg, struct sock *sk,
|
| 2899 | struct sk_buff *skb)
|
| 2900 | {
|
| 2901 | #define FLAGS_RECV_CMSGS ((1UL << SOCK_RXQ_OVFL) | \
|
| 2902 | (1UL << SOCK_RCVTSTAMP) | \
|
| 2903 | (1UL << SOCK_RCVMARK) | \
|
| 2904 | (1UL << SOCK_RCVPRIORITY) | \
|
| 2905 | (1UL << SOCK_TIMESTAMPING_ANY))
|
| 2906 | #define TSFLAGS_ANY (SOF_TIMESTAMPING_SOFTWARE | \
|
| 2907 | SOF_TIMESTAMPING_RAW_HARDWARE)
|
| 2908 |
|
| 2909 | if (READ_ONCE(sk->sk_flags) & FLAGS_RECV_CMSGS)
|
| 2910 | __sock_recv_cmsgs(msg, sk, skb);
|
| 2911 | else if (unlikely(sock_flag(sk, SOCK_TIMESTAMP)))
|
| 2912 | sock_write_timestamp(sk, skb->tstamp);
|
| 2913 | else if (unlikely(sock_read_timestamp(sk) == SK_DEFAULT_STAMP))
|
| 2914 | sock_write_timestamp(sk, 0);
|
| 2915 | }
|
| 2916 |
|
| 2917 | void __sock_tx_timestamp(__u32 tsflags, __u8 *tx_flags);
|
| 2918 |
|
| 2919 | |
| 2920 | * _sock_tx_timestamp - checks whether the outgoing packet is to be time stamped
|
| 2921 | * @sk: socket sending this packet
|
| 2922 | * @sockc: pointer to socket cmsg cookie to get timestamping info
|
| 2923 | * @tx_flags: completed with instructions for time stamping
|
| 2924 | * @tskey: filled in with next sk_tskey (not for TCP, which uses seqno)
|
| 2925 | *
|
| 2926 | * Note: callers should take care of initial ``*tx_flags`` value (usually 0)
|
| 2927 |
|
| 2928 | static inline void _sock_tx_timestamp(struct sock *sk,
|
| 2929 | const struct sockcm_cookie *sockc,
|
| 2930 | __u8 *tx_flags, __u32 *tskey)
|
| 2931 | {
|
| 2932 | __u32 tsflags = sockc->tsflags;
|
| 2933 |
|
| 2934 | if (unlikely(tsflags)) {
|
| 2935 | __sock_tx_timestamp(tsflags, tx_flags);
|
| 2936 | if (tsflags & SOF_TIMESTAMPING_OPT_ID && tskey &&
|
| 2937 | tsflags & SOF_TIMESTAMPING_TX_RECORD_MASK) {
|
| 2938 | if (tsflags & SOCKCM_FLAG_TS_OPT_ID)
|
| 2939 | *tskey = sockc->ts_opt_id;
|
| 2940 | else
|
| 2941 | *tskey = atomic_inc_return(&sk->sk_tskey) - 1;
|
| 2942 | }
|
| 2943 | }
|
| 2944 | }
|
| 2945 |
|
| 2946 | static inline void sock_tx_timestamp(struct sock *sk,
|
| 2947 | const struct sockcm_cookie *sockc,
|
| 2948 | __u8 *tx_flags)
|
| 2949 | {
|
| 2950 | _sock_tx_timestamp(sk, sockc, tx_flags, NULL);
|
| 2951 | }
|
| 2952 |
|
| 2953 | static inline void skb_setup_tx_timestamp(struct sk_buff *skb,
|
| 2954 | const struct sockcm_cookie *sockc)
|
| 2955 | {
|
| 2956 | _sock_tx_timestamp(skb->sk, sockc, &skb_shinfo(skb)->tx_flags,
|
| 2957 | &skb_shinfo(skb)->tskey);
|
| 2958 | }
|
| 2959 |
|
| 2960 | static inline bool sk_is_inet(const struct sock *sk)
|
| 2961 | {
|
| 2962 | int family = READ_ONCE(sk->sk_family);
|
| 2963 |
|
| 2964 | return family == AF_INET || family == AF_INET6;
|
| 2965 | }
|
| 2966 |
|
| 2967 | static inline bool sk_is_tcp(const struct sock *sk)
|
| 2968 | {
|
| 2969 | return sk_is_inet(sk) &&
|
| 2970 | sk->sk_type == SOCK_STREAM &&
|
| 2971 | sk->sk_protocol == IPPROTO_TCP;
|
| 2972 | }
|
| 2973 |
|
| 2974 | static inline bool sk_is_udp(const struct sock *sk)
|
| 2975 | {
|
| 2976 | return sk_is_inet(sk) &&
|
| 2977 | sk->sk_type == SOCK_DGRAM &&
|
| 2978 | sk->sk_protocol == IPPROTO_UDP;
|
| 2979 | }
|
| 2980 |
|
| 2981 | static inline bool sk_is_unix(const struct sock *sk)
|
| 2982 | {
|
| 2983 | return sk->sk_family == AF_UNIX;
|
| 2984 | }
|
| 2985 |
|
| 2986 | static inline bool sk_is_stream_unix(const struct sock *sk)
|
| 2987 | {
|
| 2988 | return sk_is_unix(sk) && sk->sk_type == SOCK_STREAM;
|
| 2989 | }
|
| 2990 |
|
| 2991 | static inline bool sk_is_vsock(const struct sock *sk)
|
| 2992 | {
|
| 2993 | return sk->sk_family == AF_VSOCK;
|
| 2994 | }
|
| 2995 |
|
| 2996 | static inline bool sk_may_scm_recv(const struct sock *sk)
|
| 2997 | {
|
| 2998 | return (IS_ENABLED(CONFIG_UNIX) && sk->sk_family == AF_UNIX) ||
|
| 2999 | sk->sk_family == AF_NETLINK ||
|
| 3000 | (IS_ENABLED(CONFIG_BT) && sk->sk_family == AF_BLUETOOTH);
|
| 3001 | }
|
| 3002 |
|
| 3003 | |
| 3004 | * sk_eat_skb - Release a skb if it is no longer needed
|
| 3005 | * @sk: socket to eat this skb from
|
| 3006 | * @skb: socket buffer to eat
|
| 3007 | *
|
| 3008 | * This routine must be called with interrupts disabled or with the socket
|
| 3009 | * locked so that the sk_buff queue operation is ok.
|
| 3010 |
|
| 3011 | static inline void sk_eat_skb(struct sock *sk, struct sk_buff *skb)
|
| 3012 | {
|
| 3013 | __skb_unlink(skb, &sk->sk_receive_queue);
|
| 3014 | __kfree_skb(skb);
|
| 3015 | }
|
| 3016 |
|
| 3017 | static inline bool
|
| 3018 | skb_sk_is_prefetched(struct sk_buff *skb)
|
| 3019 | {
|
| 3020 | #ifdef CONFIG_INET
|
| 3021 | return skb->destructor == sock_pfree;
|
| 3022 | #else
|
| 3023 | return false;
|
| 3024 | #endif
|
| 3025 | }
|
| 3026 |
|
| 3027 | |
| 3028 | * ie _not_ a timewait or request socket.
|
| 3029 |
|
| 3030 | static inline bool sk_fullsock(const struct sock *sk)
|
| 3031 | {
|
| 3032 | return (1 << sk->sk_state) & ~(TCPF_TIME_WAIT | TCPF_NEW_SYN_RECV);
|
| 3033 | }
|
| 3034 |
|
| 3035 | static inline bool
|
| 3036 | sk_is_refcounted(struct sock *sk)
|
| 3037 | {
|
| 3038 |
|
| 3039 | return !sk_fullsock(sk) || !sock_flag(sk, SOCK_RCU_FREE);
|
| 3040 | }
|
| 3041 |
|
| 3042 | static inline bool
|
| 3043 | sk_requests_wifi_status(struct sock *sk)
|
| 3044 | {
|
| 3045 | return sk && sk_fullsock(sk) && sock_flag(sk, SOCK_WIFI_STATUS);
|
| 3046 | }
|
| 3047 |
|
| 3048 | |
| 3049 | * SYNACK messages can be attached to either ones (depending on SYNCOOKIE)
|
| 3050 |
|
| 3051 | static inline bool sk_listener(const struct sock *sk)
|
| 3052 | {
|
| 3053 | return (1 << sk->sk_state) & (TCPF_LISTEN | TCPF_NEW_SYN_RECV);
|
| 3054 | }
|
| 3055 |
|
| 3056 | |
| 3057 | * TCP SYNACK messages can be attached to LISTEN or NEW_SYN_RECV (depending on SYNCOOKIE)
|
| 3058 | * TCP RST and ACK can be attached to TIME_WAIT.
|
| 3059 |
|
| 3060 | static inline bool sk_listener_or_tw(const struct sock *sk)
|
| 3061 | {
|
| 3062 | return (1 << READ_ONCE(sk->sk_state)) &
|
| 3063 | (TCPF_LISTEN | TCPF_NEW_SYN_RECV | TCPF_TIME_WAIT);
|
| 3064 | }
|
| 3065 |
|
| 3066 | void sock_enable_timestamp(struct sock *sk, enum sock_flags flag);
|
| 3067 | int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len, int level,
|
| 3068 | int type);
|
| 3069 |
|
| 3070 | bool sk_ns_capable(const struct sock *sk,
|
| 3071 | struct user_namespace *user_ns, int cap);
|
| 3072 | bool sk_capable(const struct sock *sk, int cap);
|
| 3073 | bool sk_net_capable(const struct sock *sk, int cap);
|
| 3074 |
|
| 3075 | void sk_get_meminfo(const struct sock *sk, u32 *meminfo);
|
| 3076 |
|
| 3077 | |
| 3078 | * determination of these values, since that is non-constant across
|
| 3079 | * platforms. This makes socket queueing behavior and performance
|
| 3080 | * not depend upon such differences.
|
| 3081 |
|
| 3082 | #define _SK_MEM_PACKETS 256
|
| 3083 | #define _SK_MEM_OVERHEAD SKB_TRUESIZE(256)
|
| 3084 | #define SK_WMEM_DEFAULT (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
|
| 3085 | #define SK_RMEM_DEFAULT (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
|
| 3086 |
|
| 3087 | extern __u32 sysctl_wmem_max;
|
| 3088 | extern __u32 sysctl_rmem_max;
|
| 3089 |
|
| 3090 | extern __u32 sysctl_wmem_default;
|
| 3091 | extern __u32 sysctl_rmem_default;
|
| 3092 |
|
| 3093 | #define SKB_FRAG_PAGE_ORDER get_order(32768)
|
| 3094 | DECLARE_STATIC_KEY_FALSE(net_high_order_alloc_disable_key);
|
| 3095 |
|
| 3096 | static inline int sk_get_wmem0(const struct sock *sk, const struct proto *proto)
|
| 3097 | {
|
| 3098 |
|
| 3099 | if (proto->sysctl_wmem_offset)
|
| 3100 | return READ_ONCE(*(int *)((void *)sock_net(sk) + proto->sysctl_wmem_offset));
|
| 3101 |
|
| 3102 | return READ_ONCE(*proto->sysctl_wmem);
|
| 3103 | }
|
| 3104 |
|
| 3105 | static inline int sk_get_rmem0(const struct sock *sk, const struct proto *proto)
|
| 3106 | {
|
| 3107 |
|
| 3108 | if (proto->sysctl_rmem_offset)
|
| 3109 | return READ_ONCE(*(int *)((void *)sock_net(sk) + proto->sysctl_rmem_offset));
|
| 3110 |
|
| 3111 | return READ_ONCE(*proto->sysctl_rmem);
|
| 3112 | }
|
| 3113 |
|
| 3114 | |
| 3115 | * Some wifi drivers need to tweak it to get more chunks.
|
| 3116 | * They can use this helper from their ndo_start_xmit()
|
| 3117 |
|
| 3118 | static inline void sk_pacing_shift_update(struct sock *sk, int val)
|
| 3119 | {
|
| 3120 | if (!sk || !sk_fullsock(sk) || READ_ONCE(sk->sk_pacing_shift) == val)
|
| 3121 | return;
|
| 3122 | WRITE_ONCE(sk->sk_pacing_shift, val);
|
| 3123 | }
|
| 3124 |
|
| 3125 | |
| 3126 | * index is either the same or that the socket is bound to an L3
|
| 3127 | * master device and the given device index is also enslaved to
|
| 3128 | * that L3 master
|
| 3129 |
|
| 3130 | static inline bool sk_dev_equal_l3scope(struct sock *sk, int dif)
|
| 3131 | {
|
| 3132 | int bound_dev_if = READ_ONCE(sk->sk_bound_dev_if);
|
| 3133 | int mdif;
|
| 3134 |
|
| 3135 | if (!bound_dev_if || bound_dev_if == dif)
|
| 3136 | return true;
|
| 3137 |
|
| 3138 | mdif = l3mdev_master_ifindex_by_index(sock_net(sk), dif);
|
| 3139 | if (mdif && mdif == bound_dev_if)
|
| 3140 | return true;
|
| 3141 |
|
| 3142 | return false;
|
| 3143 | }
|
| 3144 |
|
| 3145 | void sock_def_readable(struct sock *sk);
|
| 3146 |
|
| 3147 | int sock_bindtoindex(struct sock *sk, int ifindex, bool lock_sk);
|
| 3148 | void sock_set_timestamp(struct sock *sk, int optname, bool valbool);
|
| 3149 | int sock_set_timestamping(struct sock *sk, int optname,
|
| 3150 | struct so_timestamping timestamping);
|
| 3151 |
|
| 3152 | #if defined(CONFIG_CGROUP_BPF)
|
| 3153 | void bpf_skops_tx_timestamping(struct sock *sk, struct sk_buff *skb, int op);
|
| 3154 | #else
|
| 3155 | static inline void bpf_skops_tx_timestamping(struct sock *sk, struct sk_buff *skb, int op)
|
| 3156 | {
|
| 3157 | }
|
| 3158 | #endif
|
| 3159 | void sock_no_linger(struct sock *sk);
|
| 3160 | void sock_set_keepalive(struct sock *sk);
|
| 3161 | void sock_set_priority(struct sock *sk, u32 priority);
|
| 3162 | void sock_set_rcvbuf(struct sock *sk, int val);
|
| 3163 | void sock_set_mark(struct sock *sk, u32 val);
|
| 3164 | void sock_set_reuseaddr(struct sock *sk);
|
| 3165 | void sock_set_reuseport(struct sock *sk);
|
| 3166 | void sock_set_sndtimeo(struct sock *sk, s64 secs);
|
| 3167 |
|
| 3168 | int sock_bind_add(struct sock *sk, struct sockaddr_unsized *addr, int addr_len);
|
| 3169 |
|
| 3170 | int sock_get_timeout(long timeo, void *optval, bool old_timeval);
|
| 3171 | int sock_copy_user_timeval(struct __kernel_sock_timeval *tv,
|
| 3172 | sockptr_t optval, int optlen, bool old_timeval);
|
| 3173 |
|
| 3174 | int sock_ioctl_inout(struct sock *sk, unsigned int cmd,
|
| 3175 | void __user *arg, void *karg, size_t size);
|
| 3176 | int sk_ioctl(struct sock *sk, unsigned int cmd, void __user *arg);
|
| 3177 | static inline bool sk_is_readable(struct sock *sk)
|
| 3178 | {
|
| 3179 | const struct proto *prot = READ_ONCE(sk->sk_prot);
|
| 3180 |
|
| 3181 | if (prot->sock_is_readable)
|
| 3182 | return prot->sock_is_readable(sk);
|
| 3183 |
|
| 3184 | return false;
|
| 3185 | }
|
| 3186 | #endif
|