Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 4131 insertions, 0 deletions

diff --git a/net/core/sock.c b/net/core/sock.c
new file mode 100644
index 000000000..c8803b95e
--- /dev/null
+++ b/net/core/sock.c
@@ -0,0 +1,4131 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * INET		An implementation of the TCP/IP protocol suite for the LINUX
+ *		operating system.  INET is implemented using the  BSD Socket
+ *		interface as the means of communication with the user level.
+ *
+ *		Generic socket support routines. Memory allocators, socket lock/release
+ *		handler for protocols to use and generic option handler.
+ *
+ * Authors:	Ross Biro
+ *		Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
+ *		Florian La Roche, <flla@stud.uni-sb.de>
+ *		Alan Cox, <A.Cox@swansea.ac.uk>
+ *
+ * Fixes:
+ *		Alan Cox	: 	Numerous verify_area() problems
+ *		Alan Cox	:	Connecting on a connecting socket
+ *					now returns an error for tcp.
+ *		Alan Cox	:	sock->protocol is set correctly.
+ *					and is not sometimes left as 0.
+ *		Alan Cox	:	connect handles icmp errors on a
+ *					connect properly. Unfortunately there
+ *					is a restart syscall nasty there. I
+ *					can't match BSD without hacking the C
+ *					library. Ideas urgently sought!
+ *		Alan Cox	:	Disallow bind() to addresses that are
+ *					not ours - especially broadcast ones!!
+ *		Alan Cox	:	Socket 1024 _IS_ ok for users. (fencepost)
+ *		Alan Cox	:	sock_wfree/sock_rfree don't destroy sockets,
+ *					instead they leave that for the DESTROY timer.
+ *		Alan Cox	:	Clean up error flag in accept
+ *		Alan Cox	:	TCP ack handling is buggy, the DESTROY timer
+ *					was buggy. Put a remove_sock() in the handler
+ *					for memory when we hit 0. Also altered the timer
+ *					code. The ACK stuff can wait and needs major
+ *					TCP layer surgery.
+ *		Alan Cox	:	Fixed TCP ack bug, removed remove sock
+ *					and fixed timer/inet_bh race.
+ *		Alan Cox	:	Added zapped flag for TCP
+ *		Alan Cox	:	Move kfree_skb into skbuff.c and tidied up surplus code
+ *		Alan Cox	:	for new sk_buff allocations wmalloc/rmalloc now call alloc_skb
+ *		Alan Cox	:	kfree_s calls now are kfree_skbmem so we can track skb resources
+ *		Alan Cox	:	Supports socket option broadcast now as does udp. Packet and raw need fixing.
+ *		Alan Cox	:	Added RCVBUF,SNDBUF size setting. It suddenly occurred to me how easy it was so...
+ *		Rick Sladkey	:	Relaxed UDP rules for matching packets.
+ *		C.E.Hawkins	:	IFF_PROMISC/SIOCGHWADDR support
+ *	Pauline Middelink	:	identd support
+ *		Alan Cox	:	Fixed connect() taking signals I think.
+ *		Alan Cox	:	SO_LINGER supported
+ *		Alan Cox	:	Error reporting fixes
+ *		Anonymous	:	inet_create tidied up (sk->reuse setting)
+ *		Alan Cox	:	inet sockets don't set sk->type!
+ *		Alan Cox	:	Split socket option code
+ *		Alan Cox	:	Callbacks
+ *		Alan Cox	:	Nagle flag for Charles & Johannes stuff
+ *		Alex		:	Removed restriction on inet fioctl
+ *		Alan Cox	:	Splitting INET from NET core
+ *		Alan Cox	:	Fixed bogus SO_TYPE handling in getsockopt()
+ *		Adam Caldwell	:	Missing return in SO_DONTROUTE/SO_DEBUG code
+ *		Alan Cox	:	Split IP from generic code
+ *		Alan Cox	:	New kfree_skbmem()
+ *		Alan Cox	:	Make SO_DEBUG superuser only.
+ *		Alan Cox	:	Allow anyone to clear SO_DEBUG
+ *					(compatibility fix)
+ *		Alan Cox	:	Added optimistic memory grabbing for AF_UNIX throughput.
+ *		Alan Cox	:	Allocator for a socket is settable.
+ *		Alan Cox	:	SO_ERROR includes soft errors.
+ *		Alan Cox	:	Allow NULL arguments on some SO_ opts
+ *		Alan Cox	: 	Generic socket allocation to make hooks
+ *					easier (suggested by Craig Metz).
+ *		Michael Pall	:	SO_ERROR returns positive errno again
+ *              Steve Whitehouse:       Added default destructor to free
+ *                                      protocol private data.
+ *              Steve Whitehouse:       Added various other default routines
+ *                                      common to several socket families.
+ *              Chris Evans     :       Call suser() check last on F_SETOWN
+ *		Jay Schulist	:	Added SO_ATTACH_FILTER and SO_DETACH_FILTER.
+ *		Andi Kleen	:	Add sock_kmalloc()/sock_kfree_s()
+ *		Andi Kleen	:	Fix write_space callback
+ *		Chris Evans	:	Security fixes - signedness again
+ *		Arnaldo C. Melo :       cleanups, use skb_queue_purge
+ *
+ * To Fix:
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <asm/unaligned.h>
+#include <linux/capability.h>
+#include <linux/errno.h>
+#include <linux/errqueue.h>
+#include <linux/types.h>
+#include <linux/socket.h>
+#include <linux/in.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/sched.h>
+#include <linux/sched/mm.h>
+#include <linux/timer.h>
+#include <linux/string.h>
+#include <linux/sockios.h>
+#include <linux/net.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/poll.h>
+#include <linux/tcp.h>
+#include <linux/udp.h>
+#include <linux/init.h>
+#include <linux/highmem.h>
+#include <linux/user_namespace.h>
+#include <linux/static_key.h>
+#include <linux/memcontrol.h>
+#include <linux/prefetch.h>
+#include <linux/compat.h>
+
+#include <linux/uaccess.h>
+
+#include <linux/netdevice.h>
+#include <net/protocol.h>
+#include <linux/skbuff.h>
+#include <net/net_namespace.h>
+#include <net/request_sock.h>
+#include <net/sock.h>
+#include <linux/net_tstamp.h>
+#include <net/xfrm.h>
+#include <linux/ipsec.h>
+#include <net/cls_cgroup.h>
+#include <net/netprio_cgroup.h>
+#include <linux/sock_diag.h>
+
+#include <linux/filter.h>
+#include <net/sock_reuseport.h>
+#include <net/bpf_sk_storage.h>
+
+#include <trace/events/sock.h>
+
+#include <net/tcp.h>
+#include <net/busy_poll.h>
+
+#include <linux/ethtool.h>
+
+#include "dev.h"
+
+static DEFINE_MUTEX(proto_list_mutex);
+static LIST_HEAD(proto_list);
+
+static void sock_def_write_space_wfree(struct sock *sk);
+static void sock_def_write_space(struct sock *sk);
+
+/**
+ * sk_ns_capable - General socket capability test
+ * @sk: Socket to use a capability on or through
+ * @user_ns: The user namespace of the capability to use
+ * @cap: The capability to use
+ *
+ * Test to see if the opener of the socket had when the socket was
+ * created and the current process has the capability @cap in the user
+ * namespace @user_ns.
+ */
+bool sk_ns_capable(const struct sock *sk,
+		   struct user_namespace *user_ns, int cap)
+{
+	return file_ns_capable(sk->sk_socket->file, user_ns, cap) &&
+		ns_capable(user_ns, cap);
+}
+EXPORT_SYMBOL(sk_ns_capable);
+
+/**
+ * sk_capable - Socket global capability test
+ * @sk: Socket to use a capability on or through
+ * @cap: The global capability to use
+ *
+ * Test to see if the opener of the socket had when the socket was
+ * created and the current process has the capability @cap in all user
+ * namespaces.
+ */
+bool sk_capable(const struct sock *sk, int cap)
+{
+	return sk_ns_capable(sk, &init_user_ns, cap);
+}
+EXPORT_SYMBOL(sk_capable);
+
+/**
+ * sk_net_capable - Network namespace socket capability test
+ * @sk: Socket to use a capability on or through
+ * @cap: The capability to use
+ *
+ * Test to see if the opener of the socket had when the socket was created
+ * and the current process has the capability @cap over the network namespace
+ * the socket is a member of.
+ */
+bool sk_net_capable(const struct sock *sk, int cap)
+{
+	return sk_ns_capable(sk, sock_net(sk)->user_ns, cap);
+}
+EXPORT_SYMBOL(sk_net_capable);
+
+/*
+ * Each address family might have different locking rules, so we have
+ * one slock key per address family and separate keys for internal and
+ * userspace sockets.
+ */
+static struct lock_class_key af_family_keys[AF_MAX];
+static struct lock_class_key af_family_kern_keys[AF_MAX];
+static struct lock_class_key af_family_slock_keys[AF_MAX];
+static struct lock_class_key af_family_kern_slock_keys[AF_MAX];
+
+/*
+ * Make lock validator output more readable. (we pre-construct these
+ * strings build-time, so that runtime initialization of socket
+ * locks is fast):
+ */
+
+#define _sock_locks(x)						  \
+  x "AF_UNSPEC",	x "AF_UNIX"     ,	x "AF_INET"     , \
+  x "AF_AX25"  ,	x "AF_IPX"      ,	x "AF_APPLETALK", \
+  x "AF_NETROM",	x "AF_BRIDGE"   ,	x "AF_ATMPVC"   , \
+  x "AF_X25"   ,	x "AF_INET6"    ,	x "AF_ROSE"     , \
+  x "AF_DECnet",	x "AF_NETBEUI"  ,	x "AF_SECURITY" , \
+  x "AF_KEY"   ,	x "AF_NETLINK"  ,	x "AF_PACKET"   , \
+  x "AF_ASH"   ,	x "AF_ECONET"   ,	x "AF_ATMSVC"   , \
+  x "AF_RDS"   ,	x "AF_SNA"      ,	x "AF_IRDA"     , \
+  x "AF_PPPOX" ,	x "AF_WANPIPE"  ,	x "AF_LLC"      , \
+  x "27"       ,	x "28"          ,	x "AF_CAN"      , \
+  x "AF_TIPC"  ,	x "AF_BLUETOOTH",	x "IUCV"        , \
+  x "AF_RXRPC" ,	x "AF_ISDN"     ,	x "AF_PHONET"   , \
+  x "AF_IEEE802154",	x "AF_CAIF"	,	x "AF_ALG"      , \
+  x "AF_NFC"   ,	x "AF_VSOCK"    ,	x "AF_KCM"      , \
+  x "AF_QIPCRTR",	x "AF_SMC"	,	x "AF_XDP"	, \
+  x "AF_MCTP"  , \
+  x "AF_MAX"
+
+static const char *const af_family_key_strings[AF_MAX+1] = {
+	_sock_locks("sk_lock-")
+};
+static const char *const af_family_slock_key_strings[AF_MAX+1] = {
+	_sock_locks("slock-")
+};
+static const char *const af_family_clock_key_strings[AF_MAX+1] = {
+	_sock_locks("clock-")
+};
+
+static const char *const af_family_kern_key_strings[AF_MAX+1] = {
+	_sock_locks("k-sk_lock-")
+};
+static const char *const af_family_kern_slock_key_strings[AF_MAX+1] = {
+	_sock_locks("k-slock-")
+};
+static const char *const af_family_kern_clock_key_strings[AF_MAX+1] = {
+	_sock_locks("k-clock-")
+};
+static const char *const af_family_rlock_key_strings[AF_MAX+1] = {
+	_sock_locks("rlock-")
+};
+static const char *const af_family_wlock_key_strings[AF_MAX+1] = {
+	_sock_locks("wlock-")
+};
+static const char *const af_family_elock_key_strings[AF_MAX+1] = {
+	_sock_locks("elock-")
+};
+
+/*
+ * sk_callback_lock and sk queues locking rules are per-address-family,
+ * so split the lock classes by using a per-AF key:
+ */
+static struct lock_class_key af_callback_keys[AF_MAX];
+static struct lock_class_key af_rlock_keys[AF_MAX];
+static struct lock_class_key af_wlock_keys[AF_MAX];
+static struct lock_class_key af_elock_keys[AF_MAX];
+static struct lock_class_key af_kern_callback_keys[AF_MAX];
+
+/* Run time adjustable parameters. */
+__u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
+EXPORT_SYMBOL(sysctl_wmem_max);
+__u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
+EXPORT_SYMBOL(sysctl_rmem_max);
+__u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
+__u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
+
+/* Maximal space eaten by iovec or ancillary data plus some space */
+int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
+EXPORT_SYMBOL(sysctl_optmem_max);
+
+int sysctl_tstamp_allow_data __read_mostly = 1;
+
+DEFINE_STATIC_KEY_FALSE(memalloc_socks_key);
+EXPORT_SYMBOL_GPL(memalloc_socks_key);
+
+/**
+ * sk_set_memalloc - sets %SOCK_MEMALLOC
+ * @sk: socket to set it on
+ *
+ * Set %SOCK_MEMALLOC on a socket for access to emergency reserves.
+ * It's the responsibility of the admin to adjust min_free_kbytes
+ * to meet the requirements
+ */
+void sk_set_memalloc(struct sock *sk)
+{
+	sock_set_flag(sk, SOCK_MEMALLOC);
+	sk->sk_allocation |= __GFP_MEMALLOC;
+	static_branch_inc(&memalloc_socks_key);
+}
+EXPORT_SYMBOL_GPL(sk_set_memalloc);
+
+void sk_clear_memalloc(struct sock *sk)
+{
+	sock_reset_flag(sk, SOCK_MEMALLOC);
+	sk->sk_allocation &= ~__GFP_MEMALLOC;
+	static_branch_dec(&memalloc_socks_key);
+
+	/*
+	 * SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward
+	 * progress of swapping. SOCK_MEMALLOC may be cleared while
+	 * it has rmem allocations due to the last swapfile being deactivated
+	 * but there is a risk that the socket is unusable due to exceeding
+	 * the rmem limits. Reclaim the reserves and obey rmem limits again.
+	 */
+	sk_mem_reclaim(sk);
+}
+EXPORT_SYMBOL_GPL(sk_clear_memalloc);
+
+int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
+{
+	int ret;
+	unsigned int noreclaim_flag;
+
+	/* these should have been dropped before queueing */
+	BUG_ON(!sock_flag(sk, SOCK_MEMALLOC));
+
+	noreclaim_flag = memalloc_noreclaim_save();
+	ret = INDIRECT_CALL_INET(sk->sk_backlog_rcv,
+				 tcp_v6_do_rcv,
+				 tcp_v4_do_rcv,
+				 sk, skb);
+	memalloc_noreclaim_restore(noreclaim_flag);
+
+	return ret;
+}
+EXPORT_SYMBOL(__sk_backlog_rcv);
+
+void sk_error_report(struct sock *sk)
+{
+	sk->sk_error_report(sk);
+
+	switch (sk->sk_family) {
+	case AF_INET:
+		fallthrough;
+	case AF_INET6:
+		trace_inet_sk_error_report(sk);
+		break;
+	default:
+		break;
+	}
+}
+EXPORT_SYMBOL(sk_error_report);
+
+int sock_get_timeout(long timeo, void *optval, bool old_timeval)
+{
+	struct __kernel_sock_timeval tv;
+
+	if (timeo == MAX_SCHEDULE_TIMEOUT) {
+		tv.tv_sec = 0;
+		tv.tv_usec = 0;
+	} else {
+		tv.tv_sec = timeo / HZ;
+		tv.tv_usec = ((timeo % HZ) * USEC_PER_SEC) / HZ;
+	}
+
+	if (old_timeval && in_compat_syscall() && !COMPAT_USE_64BIT_TIME) {
+		struct old_timeval32 tv32 = { tv.tv_sec, tv.tv_usec };
+		*(struct old_timeval32 *)optval = tv32;
+		return sizeof(tv32);
+	}
+
+	if (old_timeval) {
+		struct __kernel_old_timeval old_tv;
+		old_tv.tv_sec = tv.tv_sec;
+		old_tv.tv_usec = tv.tv_usec;
+		*(struct __kernel_old_timeval *)optval = old_tv;
+		return sizeof(old_tv);
+	}
+
+	*(struct __kernel_sock_timeval *)optval = tv;
+	return sizeof(tv);
+}
+EXPORT_SYMBOL(sock_get_timeout);
+
+int sock_copy_user_timeval(struct __kernel_sock_timeval *tv,
+			   sockptr_t optval, int optlen, bool old_timeval)
+{
+	if (old_timeval && in_compat_syscall() && !COMPAT_USE_64BIT_TIME) {
+		struct old_timeval32 tv32;
+
+		if (optlen < sizeof(tv32))
+			return -EINVAL;
+
+		if (copy_from_sockptr(&tv32, optval, sizeof(tv32)))
+			return -EFAULT;
+		tv->tv_sec = tv32.tv_sec;
+		tv->tv_usec = tv32.tv_usec;
+	} else if (old_timeval) {
+		struct __kernel_old_timeval old_tv;
+
+		if (optlen < sizeof(old_tv))
+			return -EINVAL;
+		if (copy_from_sockptr(&old_tv, optval, sizeof(old_tv)))
+			return -EFAULT;
+		tv->tv_sec = old_tv.tv_sec;
+		tv->tv_usec = old_tv.tv_usec;
+	} else {
+		if (optlen < sizeof(*tv))
+			return -EINVAL;
+		if (copy_from_sockptr(tv, optval, sizeof(*tv)))
+			return -EFAULT;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL(sock_copy_user_timeval);
+
+static int sock_set_timeout(long *timeo_p, sockptr_t optval, int optlen,
+			    bool old_timeval)
+{
+	struct __kernel_sock_timeval tv;
+	int err = sock_copy_user_timeval(&tv, optval, optlen, old_timeval);
+	long val;
+
+	if (err)
+		return err;
+
+	if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
+		return -EDOM;
+
+	if (tv.tv_sec < 0) {
+		static int warned __read_mostly;
+
+		WRITE_ONCE(*timeo_p, 0);
+		if (warned < 10 && net_ratelimit()) {
+			warned++;
+			pr_info("%s: `%s' (pid %d) tries to set negative timeout\n",
+				__func__, current->comm, task_pid_nr(current));
+		}
+		return 0;
+	}
+	val = MAX_SCHEDULE_TIMEOUT;
+	if ((tv.tv_sec || tv.tv_usec) &&
+	    (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT / HZ - 1)))
+		val = tv.tv_sec * HZ + DIV_ROUND_UP((unsigned long)tv.tv_usec,
+						    USEC_PER_SEC / HZ);
+	WRITE_ONCE(*timeo_p, val);
+	return 0;
+}
+
+static bool sock_needs_netstamp(const struct sock *sk)
+{
+	switch (sk->sk_family) {
+	case AF_UNSPEC:
+	case AF_UNIX:
+		return false;
+	default:
+		return true;
+	}
+}
+
+static void sock_disable_timestamp(struct sock *sk, unsigned long flags)
+{
+	if (sk->sk_flags & flags) {
+		sk->sk_flags &= ~flags;
+		if (sock_needs_netstamp(sk) &&
+		    !(sk->sk_flags & SK_FLAGS_TIMESTAMP))
+			net_disable_timestamp();
+	}
+}
+
+
+int __sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
+{
+	unsigned long flags;
+	struct sk_buff_head *list = &sk->sk_receive_queue;
+
+	if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) {
+		atomic_inc(&sk->sk_drops);
+		trace_sock_rcvqueue_full(sk, skb);
+		return -ENOMEM;
+	}
+
+	if (!sk_rmem_schedule(sk, skb, skb->truesize)) {
+		atomic_inc(&sk->sk_drops);
+		return -ENOBUFS;
+	}
+
+	skb->dev = NULL;
+	skb_set_owner_r(skb, sk);
+
+	/* we escape from rcu protected region, make sure we dont leak
+	 * a norefcounted dst
+	 */
+	skb_dst_force(skb);
+
+	spin_lock_irqsave(&list->lock, flags);
+	sock_skb_set_dropcount(sk, skb);
+	__skb_queue_tail(list, skb);
+	spin_unlock_irqrestore(&list->lock, flags);
+
+	if (!sock_flag(sk, SOCK_DEAD))
+		sk->sk_data_ready(sk);
+	return 0;
+}
+EXPORT_SYMBOL(__sock_queue_rcv_skb);
+
+int sock_queue_rcv_skb_reason(struct sock *sk, struct sk_buff *skb,
+			      enum skb_drop_reason *reason)
+{
+	enum skb_drop_reason drop_reason;
+	int err;
+
+	err = sk_filter(sk, skb);
+	if (err) {
+		drop_reason = SKB_DROP_REASON_SOCKET_FILTER;
+		goto out;
+	}
+	err = __sock_queue_rcv_skb(sk, skb);
+	switch (err) {
+	case -ENOMEM:
+		drop_reason = SKB_DROP_REASON_SOCKET_RCVBUFF;
+		break;
+	case -ENOBUFS:
+		drop_reason = SKB_DROP_REASON_PROTO_MEM;
+		break;
+	default:
+		drop_reason = SKB_NOT_DROPPED_YET;
+		break;
+	}
+out:
+	if (reason)
+		*reason = drop_reason;
+	return err;
+}
+EXPORT_SYMBOL(sock_queue_rcv_skb_reason);
+
+int __sk_receive_skb(struct sock *sk, struct sk_buff *skb,
+		     const int nested, unsigned int trim_cap, bool refcounted)
+{
+	int rc = NET_RX_SUCCESS;
+
+	if (sk_filter_trim_cap(sk, skb, trim_cap))
+		goto discard_and_relse;
+
+	skb->dev = NULL;
+
+	if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) {
+		atomic_inc(&sk->sk_drops);
+		goto discard_and_relse;
+	}
+	if (nested)
+		bh_lock_sock_nested(sk);
+	else
+		bh_lock_sock(sk);
+	if (!sock_owned_by_user(sk)) {
+		/*
+		 * trylock + unlock semantics:
+		 */
+		mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);
+
+		rc = sk_backlog_rcv(sk, skb);
+
+		mutex_release(&sk->sk_lock.dep_map, _RET_IP_);
+	} else if (sk_add_backlog(sk, skb, READ_ONCE(sk->sk_rcvbuf))) {
+		bh_unlock_sock(sk);
+		atomic_inc(&sk->sk_drops);
+		goto discard_and_relse;
+	}
+
+	bh_unlock_sock(sk);
+out:
+	if (refcounted)
+		sock_put(sk);
+	return rc;
+discard_and_relse:
+	kfree_skb(skb);
+	goto out;
+}
+EXPORT_SYMBOL(__sk_receive_skb);
+
+INDIRECT_CALLABLE_DECLARE(struct dst_entry *ip6_dst_check(struct dst_entry *,
+							  u32));
+INDIRECT_CALLABLE_DECLARE(struct dst_entry *ipv4_dst_check(struct dst_entry *,
+							   u32));
+struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
+{
+	struct dst_entry *dst = __sk_dst_get(sk);
+
+	if (dst && dst->obsolete &&
+	    INDIRECT_CALL_INET(dst->ops->check, ip6_dst_check, ipv4_dst_check,
+			       dst, cookie) == NULL) {
+		sk_tx_queue_clear(sk);
+		WRITE_ONCE(sk->sk_dst_pending_confirm, 0);
+		RCU_INIT_POINTER(sk->sk_dst_cache, NULL);
+		dst_release(dst);
+		return NULL;
+	}
+
+	return dst;
+}
+EXPORT_SYMBOL(__sk_dst_check);
+
+struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
+{
+	struct dst_entry *dst = sk_dst_get(sk);
+
+	if (dst && dst->obsolete &&
+	    INDIRECT_CALL_INET(dst->ops->check, ip6_dst_check, ipv4_dst_check,
+			       dst, cookie) == NULL) {
+		sk_dst_reset(sk);
+		dst_release(dst);
+		return NULL;
+	}
+
+	return dst;
+}
+EXPORT_SYMBOL(sk_dst_check);
+
+static int sock_bindtoindex_locked(struct sock *sk, int ifindex)
+{
+	int ret = -ENOPROTOOPT;
+#ifdef CONFIG_NETDEVICES
+	struct net *net = sock_net(sk);
+
+	/* Sorry... */
+	ret = -EPERM;
+	if (sk->sk_bound_dev_if && !ns_capable(net->user_ns, CAP_NET_RAW))
+		goto out;
+
+	ret = -EINVAL;
+	if (ifindex < 0)
+		goto out;
+
+	/* Paired with all READ_ONCE() done locklessly. */
+	WRITE_ONCE(sk->sk_bound_dev_if, ifindex);
+
+	if (sk->sk_prot->rehash)
+		sk->sk_prot->rehash(sk);
+	sk_dst_reset(sk);
+
+	ret = 0;
+
+out:
+#endif
+
+	return ret;
+}
+
+int sock_bindtoindex(struct sock *sk, int ifindex, bool lock_sk)
+{
+	int ret;
+
+	if (lock_sk)
+		lock_sock(sk);
+	ret = sock_bindtoindex_locked(sk, ifindex);
+	if (lock_sk)
+		release_sock(sk);
+
+	return ret;
+}
+EXPORT_SYMBOL(sock_bindtoindex);
+
+static int sock_setbindtodevice(struct sock *sk, sockptr_t optval, int optlen)
+{
+	int ret = -ENOPROTOOPT;
+#ifdef CONFIG_NETDEVICES
+	struct net *net = sock_net(sk);
+	char devname[IFNAMSIZ];
+	int index;
+
+	ret = -EINVAL;
+	if (optlen < 0)
+		goto out;
+
+	/* Bind this socket to a particular device like "eth0",
+	 * as specified in the passed interface name. If the
+	 * name is "" or the option length is zero the socket
+	 * is not bound.
+	 */
+	if (optlen > IFNAMSIZ - 1)
+		optlen = IFNAMSIZ - 1;
+	memset(devname, 0, sizeof(devname));
+
+	ret = -EFAULT;
+	if (copy_from_sockptr(devname, optval, optlen))
+		goto out;
+
+	index = 0;
+	if (devname[0] != '\0') {
+		struct net_device *dev;
+
+		rcu_read_lock();
+		dev = dev_get_by_name_rcu(net, devname);
+		if (dev)
+			index = dev->ifindex;
+		rcu_read_unlock();
+		ret = -ENODEV;
+		if (!dev)
+			goto out;
+	}
+
+	sockopt_lock_sock(sk);
+	ret = sock_bindtoindex_locked(sk, index);
+	sockopt_release_sock(sk);
+out:
+#endif
+
+	return ret;
+}
+
+static int sock_getbindtodevice(struct sock *sk, sockptr_t optval,
+				sockptr_t optlen, int len)
+{
+	int ret = -ENOPROTOOPT;
+#ifdef CONFIG_NETDEVICES
+	int bound_dev_if = READ_ONCE(sk->sk_bound_dev_if);
+	struct net *net = sock_net(sk);
+	char devname[IFNAMSIZ];
+
+	if (bound_dev_if == 0) {
+		len = 0;
+		goto zero;
+	}
+
+	ret = -EINVAL;
+	if (len < IFNAMSIZ)
+		goto out;
+
+	ret = netdev_get_name(net, devname, bound_dev_if);
+	if (ret)
+		goto out;
+
+	len = strlen(devname) + 1;
+
+	ret = -EFAULT;
+	if (copy_to_sockptr(optval, devname, len))
+		goto out;
+
+zero:
+	ret = -EFAULT;
+	if (copy_to_sockptr(optlen, &len, sizeof(int)))
+		goto out;
+
+	ret = 0;
+
+out:
+#endif
+
+	return ret;
+}
+
+bool sk_mc_loop(struct sock *sk)
+{
+	if (dev_recursion_level())
+		return false;
+	if (!sk)
+		return true;
+	/* IPV6_ADDRFORM can change sk->sk_family under us. */
+	switch (READ_ONCE(sk->sk_family)) {
+	case AF_INET:
+		return inet_sk(sk)->mc_loop;
+#if IS_ENABLED(CONFIG_IPV6)
+	case AF_INET6:
+		return inet6_sk(sk)->mc_loop;
+#endif
+	}
+	WARN_ON_ONCE(1);
+	return true;
+}
+EXPORT_SYMBOL(sk_mc_loop);
+
+void sock_set_reuseaddr(struct sock *sk)
+{
+	lock_sock(sk);
+	sk->sk_reuse = SK_CAN_REUSE;
+	release_sock(sk);
+}
+EXPORT_SYMBOL(sock_set_reuseaddr);
+
+void sock_set_reuseport(struct sock *sk)
+{
+	lock_sock(sk);
+	sk->sk_reuseport = true;
+	release_sock(sk);
+}
+EXPORT_SYMBOL(sock_set_reuseport);
+
+void sock_no_linger(struct sock *sk)
+{
+	lock_sock(sk);
+	WRITE_ONCE(sk->sk_lingertime, 0);
+	sock_set_flag(sk, SOCK_LINGER);
+	release_sock(sk);
+}
+EXPORT_SYMBOL(sock_no_linger);
+
+void sock_set_priority(struct sock *sk, u32 priority)
+{
+	lock_sock(sk);
+	WRITE_ONCE(sk->sk_priority, priority);
+	release_sock(sk);
+}
+EXPORT_SYMBOL(sock_set_priority);
+
+void sock_set_sndtimeo(struct sock *sk, s64 secs)
+{
+	lock_sock(sk);
+	if (secs && secs < MAX_SCHEDULE_TIMEOUT / HZ - 1)
+		WRITE_ONCE(sk->sk_sndtimeo, secs * HZ);
+	else
+		WRITE_ONCE(sk->sk_sndtimeo, MAX_SCHEDULE_TIMEOUT);
+	release_sock(sk);
+}
+EXPORT_SYMBOL(sock_set_sndtimeo);
+
+static void __sock_set_timestamps(struct sock *sk, bool val, bool new, bool ns)
+{
+	if (val)  {
+		sock_valbool_flag(sk, SOCK_TSTAMP_NEW, new);
+		sock_valbool_flag(sk, SOCK_RCVTSTAMPNS, ns);
+		sock_set_flag(sk, SOCK_RCVTSTAMP);
+		sock_enable_timestamp(sk, SOCK_TIMESTAMP);
+	} else {
+		sock_reset_flag(sk, SOCK_RCVTSTAMP);
+		sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
+	}
+}
+
+void sock_enable_timestamps(struct sock *sk)
+{
+	lock_sock(sk);
+	__sock_set_timestamps(sk, true, false, true);
+	release_sock(sk);
+}
+EXPORT_SYMBOL(sock_enable_timestamps);
+
+void sock_set_timestamp(struct sock *sk, int optname, bool valbool)
+{
+	switch (optname) {
+	case SO_TIMESTAMP_OLD:
+		__sock_set_timestamps(sk, valbool, false, false);
+		break;
+	case SO_TIMESTAMP_NEW:
+		__sock_set_timestamps(sk, valbool, true, false);
+		break;
+	case SO_TIMESTAMPNS_OLD:
+		__sock_set_timestamps(sk, valbool, false, true);
+		break;
+	case SO_TIMESTAMPNS_NEW:
+		__sock_set_timestamps(sk, valbool, true, true);
+		break;
+	}
+}
+
+static int sock_timestamping_bind_phc(struct sock *sk, int phc_index)
+{
+	struct net *net = sock_net(sk);
+	struct net_device *dev = NULL;
+	bool match = false;
+	int *vclock_index;
+	int i, num;
+
+	if (sk->sk_bound_dev_if)
+		dev = dev_get_by_index(net, sk->sk_bound_dev_if);
+
+	if (!dev) {
+		pr_err("%s: sock not bind to device\n", __func__);
+		return -EOPNOTSUPP;
+	}
+
+	num = ethtool_get_phc_vclocks(dev, &vclock_index);
+	dev_put(dev);
+
+	for (i = 0; i < num; i++) {
+		if (*(vclock_index + i) == phc_index) {
+			match = true;
+			break;
+		}
+	}
+
+	if (num > 0)
+		kfree(vclock_index);
+
+	if (!match)
+		return -EINVAL;
+
+	WRITE_ONCE(sk->sk_bind_phc, phc_index);
+
+	return 0;
+}
+
+int sock_set_timestamping(struct sock *sk, int optname,
+			  struct so_timestamping timestamping)
+{
+	int val = timestamping.flags;
+	int ret;
+
+	if (val & ~SOF_TIMESTAMPING_MASK)
+		return -EINVAL;
+
+	if (val & SOF_TIMESTAMPING_OPT_ID &&
+	    !(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID)) {
+		if (sk_is_tcp(sk)) {
+			if ((1 << sk->sk_state) &
+			    (TCPF_CLOSE | TCPF_LISTEN))
+				return -EINVAL;
+			atomic_set(&sk->sk_tskey, tcp_sk(sk)->snd_una);
+		} else {
+			atomic_set(&sk->sk_tskey, 0);
+		}
+	}
+
+	if (val & SOF_TIMESTAMPING_OPT_STATS &&
+	    !(val & SOF_TIMESTAMPING_OPT_TSONLY))
+		return -EINVAL;
+
+	if (val & SOF_TIMESTAMPING_BIND_PHC) {
+		ret = sock_timestamping_bind_phc(sk, timestamping.bind_phc);
+		if (ret)
+			return ret;
+	}
+
+	WRITE_ONCE(sk->sk_tsflags, val);
+	sock_valbool_flag(sk, SOCK_TSTAMP_NEW, optname == SO_TIMESTAMPING_NEW);
+
+	if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
+		sock_enable_timestamp(sk,
+				      SOCK_TIMESTAMPING_RX_SOFTWARE);
+	else
+		sock_disable_timestamp(sk,
+				       (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE));
+	return 0;
+}
+
+void sock_set_keepalive(struct sock *sk)
+{
+	lock_sock(sk);
+	if (sk->sk_prot->keepalive)
+		sk->sk_prot->keepalive(sk, true);
+	sock_valbool_flag(sk, SOCK_KEEPOPEN, true);
+	release_sock(sk);
+}
+EXPORT_SYMBOL(sock_set_keepalive);
+
+static void __sock_set_rcvbuf(struct sock *sk, int val)
+{
+	/* Ensure val * 2 fits into an int, to prevent max_t() from treating it
+	 * as a negative value.
+	 */
+	val = min_t(int, val, INT_MAX / 2);
+	sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
+
+	/* We double it on the way in to account for "struct sk_buff" etc.
+	 * overhead.   Applications assume that the SO_RCVBUF setting they make
+	 * will allow that much actual data to be received on that socket.
+	 *
+	 * Applications are unaware that "struct sk_buff" and other overheads
+	 * allocate from the receive buffer during socket buffer allocation.
+	 *
+	 * And after considering the possible alternatives, returning the value
+	 * we actually used in getsockopt is the most desirable behavior.
+	 */
+	WRITE_ONCE(sk->sk_rcvbuf, max_t(int, val * 2, SOCK_MIN_RCVBUF));
+}
+
+void sock_set_rcvbuf(struct sock *sk, int val)
+{
+	lock_sock(sk);
+	__sock_set_rcvbuf(sk, val);
+	release_sock(sk);
+}
+EXPORT_SYMBOL(sock_set_rcvbuf);
+
+static void __sock_set_mark(struct sock *sk, u32 val)
+{
+	if (val != sk->sk_mark) {
+		WRITE_ONCE(sk->sk_mark, val);
+		sk_dst_reset(sk);
+	}
+}
+
+void sock_set_mark(struct sock *sk, u32 val)
+{
+	lock_sock(sk);
+	__sock_set_mark(sk, val);
+	release_sock(sk);
+}
+EXPORT_SYMBOL(sock_set_mark);
+
+static void sock_release_reserved_memory(struct sock *sk, int bytes)
+{
+	/* Round down bytes to multiple of pages */
+	bytes = round_down(bytes, PAGE_SIZE);
+
+	WARN_ON(bytes > sk->sk_reserved_mem);
+	WRITE_ONCE(sk->sk_reserved_mem, sk->sk_reserved_mem - bytes);
+	sk_mem_reclaim(sk);
+}
+
+static int sock_reserve_memory(struct sock *sk, int bytes)
+{
+	long allocated;
+	bool charged;
+	int pages;
+
+	if (!mem_cgroup_sockets_enabled || !sk->sk_memcg || !sk_has_account(sk))
+		return -EOPNOTSUPP;
+
+	if (!bytes)
+		return 0;
+
+	pages = sk_mem_pages(bytes);
+
+	/* pre-charge to memcg */
+	charged = mem_cgroup_charge_skmem(sk->sk_memcg, pages,
+					  GFP_KERNEL | __GFP_RETRY_MAYFAIL);
+	if (!charged)
+		return -ENOMEM;
+
+	/* pre-charge to forward_alloc */
+	sk_memory_allocated_add(sk, pages);
+	allocated = sk_memory_allocated(sk);
+	/* If the system goes into memory pressure with this
+	 * precharge, give up and return error.
+	 */
+	if (allocated > sk_prot_mem_limits(sk, 1)) {
+		sk_memory_allocated_sub(sk, pages);
+		mem_cgroup_uncharge_skmem(sk->sk_memcg, pages);
+		return -ENOMEM;
+	}
+	sk_forward_alloc_add(sk, pages << PAGE_SHIFT);
+
+	WRITE_ONCE(sk->sk_reserved_mem,
+		   sk->sk_reserved_mem + (pages << PAGE_SHIFT));
+
+	return 0;
+}
+
+void sockopt_lock_sock(struct sock *sk)
+{
+	/* When current->bpf_ctx is set, the setsockopt is called from
+	 * a bpf prog.  bpf has ensured the sk lock has been
+	 * acquired before calling setsockopt().
+	 */
+	if (has_current_bpf_ctx())
+		return;
+
+	lock_sock(sk);
+}
+EXPORT_SYMBOL(sockopt_lock_sock);
+
+void sockopt_release_sock(struct sock *sk)
+{
+	if (has_current_bpf_ctx())
+		return;
+
+	release_sock(sk);
+}
+EXPORT_SYMBOL(sockopt_release_sock);
+
+bool sockopt_ns_capable(struct user_namespace *ns, int cap)
+{
+	return has_current_bpf_ctx() || ns_capable(ns, cap);
+}
+EXPORT_SYMBOL(sockopt_ns_capable);
+
+bool sockopt_capable(int cap)
+{
+	return has_current_bpf_ctx() || capable(cap);
+}
+EXPORT_SYMBOL(sockopt_capable);
+
+/*
+ *	This is meant for all protocols to use and covers goings on
+ *	at the socket level. Everything here is generic.
+ */
+
+int sk_setsockopt(struct sock *sk, int level, int optname,
+		  sockptr_t optval, unsigned int optlen)
+{
+	struct so_timestamping timestamping;
+	struct socket *sock = sk->sk_socket;
+	struct sock_txtime sk_txtime;
+	int val;
+	int valbool;
+	struct linger ling;
+	int ret = 0;
+
+	/*
+	 *	Options without arguments
+	 */
+
+	if (optname == SO_BINDTODEVICE)
+		return sock_setbindtodevice(sk, optval, optlen);
+
+	if (optlen < sizeof(int))
+		return -EINVAL;
+
+	if (copy_from_sockptr(&val, optval, sizeof(val)))
+		return -EFAULT;
+
+	valbool = val ? 1 : 0;
+
+	sockopt_lock_sock(sk);
+
+	switch (optname) {
+	case SO_DEBUG:
+		if (val && !sockopt_capable(CAP_NET_ADMIN))
+			ret = -EACCES;
+		else
+			sock_valbool_flag(sk, SOCK_DBG, valbool);
+		break;
+	case SO_REUSEADDR:
+		sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE);
+		break;
+	case SO_REUSEPORT:
+		sk->sk_reuseport = valbool;
+		break;
+	case SO_TYPE:
+	case SO_PROTOCOL:
+	case SO_DOMAIN:
+	case SO_ERROR:
+		ret = -ENOPROTOOPT;
+		break;
+	case SO_DONTROUTE:
+		sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
+		sk_dst_reset(sk);
+		break;
+	case SO_BROADCAST:
+		sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
+		break;
+	case SO_SNDBUF:
+		/* Don't error on this BSD doesn't and if you think
+		 * about it this is right. Otherwise apps have to
+		 * play 'guess the biggest size' games. RCVBUF/SNDBUF
+		 * are treated in BSD as hints
+		 */
+		val = min_t(u32, val, READ_ONCE(sysctl_wmem_max));
+set_sndbuf:
+		/* Ensure val * 2 fits into an int, to prevent max_t()
+		 * from treating it as a negative value.
+		 */
+		val = min_t(int, val, INT_MAX / 2);
+		sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
+		WRITE_ONCE(sk->sk_sndbuf,
+			   max_t(int, val * 2, SOCK_MIN_SNDBUF));
+		/* Wake up sending tasks if we upped the value. */
+		sk->sk_write_space(sk);
+		break;
+
+	case SO_SNDBUFFORCE:
+		if (!sockopt_capable(CAP_NET_ADMIN)) {
+			ret = -EPERM;
+			break;
+		}
+
+		/* No negative values (to prevent underflow, as val will be
+		 * multiplied by 2).
+		 */
+		if (val < 0)
+			val = 0;
+		goto set_sndbuf;
+
+	case SO_RCVBUF:
+		/* Don't error on this BSD doesn't and if you think
+		 * about it this is right. Otherwise apps have to
+		 * play 'guess the biggest size' games. RCVBUF/SNDBUF
+		 * are treated in BSD as hints
+		 */
+		__sock_set_rcvbuf(sk, min_t(u32, val, READ_ONCE(sysctl_rmem_max)));
+		break;
+
+	case SO_RCVBUFFORCE:
+		if (!sockopt_capable(CAP_NET_ADMIN)) {
+			ret = -EPERM;
+			break;
+		}
+
+		/* No negative values (to prevent underflow, as val will be
+		 * multiplied by 2).
+		 */
+		__sock_set_rcvbuf(sk, max(val, 0));
+		break;
+
+	case SO_KEEPALIVE:
+		if (sk->sk_prot->keepalive)
+			sk->sk_prot->keepalive(sk, valbool);
+		sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
+		break;
+
+	case SO_OOBINLINE:
+		sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
+		break;
+
+	case SO_NO_CHECK:
+		sk->sk_no_check_tx = valbool;
+		break;
+
+	case SO_PRIORITY:
+		if ((val >= 0 && val <= 6) ||
+		    sockopt_ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) ||
+		    sockopt_ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
+			WRITE_ONCE(sk->sk_priority, val);
+		else
+			ret = -EPERM;
+		break;
+
+	case SO_LINGER:
+		if (optlen < sizeof(ling)) {
+			ret = -EINVAL;	/* 1003.1g */
+			break;
+		}
+		if (copy_from_sockptr(&ling, optval, sizeof(ling))) {
+			ret = -EFAULT;
+			break;
+		}
+		if (!ling.l_onoff) {
+			sock_reset_flag(sk, SOCK_LINGER);
+		} else {
+			unsigned long t_sec = ling.l_linger;
+
+			if (t_sec >= MAX_SCHEDULE_TIMEOUT / HZ)
+				WRITE_ONCE(sk->sk_lingertime, MAX_SCHEDULE_TIMEOUT);
+			else
+				WRITE_ONCE(sk->sk_lingertime, t_sec * HZ);
+			sock_set_flag(sk, SOCK_LINGER);
+		}
+		break;
+
+	case SO_BSDCOMPAT:
+		break;
+
+	case SO_PASSCRED:
+		if (valbool)
+			set_bit(SOCK_PASSCRED, &sock->flags);
+		else
+			clear_bit(SOCK_PASSCRED, &sock->flags);
+		break;
+
+	case SO_TIMESTAMP_OLD:
+	case SO_TIMESTAMP_NEW:
+	case SO_TIMESTAMPNS_OLD:
+	case SO_TIMESTAMPNS_NEW:
+		sock_set_timestamp(sk, optname, valbool);
+		break;
+
+	case SO_TIMESTAMPING_NEW:
+	case SO_TIMESTAMPING_OLD:
+		if (optlen == sizeof(timestamping)) {
+			if (copy_from_sockptr(&timestamping, optval,
+					      sizeof(timestamping))) {
+				ret = -EFAULT;
+				break;
+			}
+		} else {
+			memset(&timestamping, 0, sizeof(timestamping));
+			timestamping.flags = val;
+		}
+		ret = sock_set_timestamping(sk, optname, timestamping);
+		break;
+
+	case SO_RCVLOWAT:
+		if (val < 0)
+			val = INT_MAX;
+		if (sock && sock->ops->set_rcvlowat)
+			ret = sock->ops->set_rcvlowat(sk, val);
+		else
+			WRITE_ONCE(sk->sk_rcvlowat, val ? : 1);
+		break;
+
+	case SO_RCVTIMEO_OLD:
+	case SO_RCVTIMEO_NEW:
+		ret = sock_set_timeout(&sk->sk_rcvtimeo, optval,
+				       optlen, optname == SO_RCVTIMEO_OLD);
+		break;
+
+	case SO_SNDTIMEO_OLD:
+	case SO_SNDTIMEO_NEW:
+		ret = sock_set_timeout(&sk->sk_sndtimeo, optval,
+				       optlen, optname == SO_SNDTIMEO_OLD);
+		break;
+
+	case SO_ATTACH_FILTER: {
+		struct sock_fprog fprog;
+
+		ret = copy_bpf_fprog_from_user(&fprog, optval, optlen);
+		if (!ret)
+			ret = sk_attach_filter(&fprog, sk);
+		break;
+	}
+	case SO_ATTACH_BPF:
+		ret = -EINVAL;
+		if (optlen == sizeof(u32)) {
+			u32 ufd;
+
+			ret = -EFAULT;
+			if (copy_from_sockptr(&ufd, optval, sizeof(ufd)))
+				break;
+
+			ret = sk_attach_bpf(ufd, sk);
+		}
+		break;
+
+	case SO_ATTACH_REUSEPORT_CBPF: {
+		struct sock_fprog fprog;
+
+		ret = copy_bpf_fprog_from_user(&fprog, optval, optlen);
+		if (!ret)
+			ret = sk_reuseport_attach_filter(&fprog, sk);
+		break;
+	}
+	case SO_ATTACH_REUSEPORT_EBPF:
+		ret = -EINVAL;
+		if (optlen == sizeof(u32)) {
+			u32 ufd;
+
+			ret = -EFAULT;
+			if (copy_from_sockptr(&ufd, optval, sizeof(ufd)))
+				break;
+
+			ret = sk_reuseport_attach_bpf(ufd, sk);
+		}
+		break;
+
+	case SO_DETACH_REUSEPORT_BPF:
+		ret = reuseport_detach_prog(sk);
+		break;
+
+	case SO_DETACH_FILTER:
+		ret = sk_detach_filter(sk);
+		break;
+
+	case SO_LOCK_FILTER:
+		if (sock_flag(sk, SOCK_FILTER_LOCKED) && !valbool)
+			ret = -EPERM;
+		else
+			sock_valbool_flag(sk, SOCK_FILTER_LOCKED, valbool);
+		break;
+
+	case SO_PASSSEC:
+		if (valbool)
+			set_bit(SOCK_PASSSEC, &sock->flags);
+		else
+			clear_bit(SOCK_PASSSEC, &sock->flags);
+		break;
+	case SO_MARK:
+		if (!sockopt_ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) &&
+		    !sockopt_ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) {
+			ret = -EPERM;
+			break;
+		}
+
+		__sock_set_mark(sk, val);
+		break;
+	case SO_RCVMARK:
+		sock_valbool_flag(sk, SOCK_RCVMARK, valbool);
+		break;
+
+	case SO_RXQ_OVFL:
+		sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool);
+		break;
+
+	case SO_WIFI_STATUS:
+		sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool);
+		break;
+
+	case SO_PEEK_OFF:
+		if (sock->ops->set_peek_off)
+			ret = sock->ops->set_peek_off(sk, val);
+		else
+			ret = -EOPNOTSUPP;
+		break;
+
+	case SO_NOFCS:
+		sock_valbool_flag(sk, SOCK_NOFCS, valbool);
+		break;
+
+	case SO_SELECT_ERR_QUEUE:
+		sock_valbool_flag(sk, SOCK_SELECT_ERR_QUEUE, valbool);
+		break;
+
+#ifdef CONFIG_NET_RX_BUSY_POLL
+	case SO_BUSY_POLL:
+		/* allow unprivileged users to decrease the value */
+		if ((val > sk->sk_ll_usec) && !sockopt_capable(CAP_NET_ADMIN))
+			ret = -EPERM;
+		else {
+			if (val < 0)
+				ret = -EINVAL;
+			else
+				WRITE_ONCE(sk->sk_ll_usec, val);
+		}
+		break;
+	case SO_PREFER_BUSY_POLL:
+		if (valbool && !sockopt_capable(CAP_NET_ADMIN))
+			ret = -EPERM;
+		else
+			WRITE_ONCE(sk->sk_prefer_busy_poll, valbool);
+		break;
+	case SO_BUSY_POLL_BUDGET:
+		if (val > READ_ONCE(sk->sk_busy_poll_budget) && !sockopt_capable(CAP_NET_ADMIN)) {
+			ret = -EPERM;
+		} else {
+			if (val < 0 || val > U16_MAX)
+				ret = -EINVAL;
+			else
+				WRITE_ONCE(sk->sk_busy_poll_budget, val);
+		}
+		break;
+#endif
+
+	case SO_MAX_PACING_RATE:
+		{
+		unsigned long ulval = (val == ~0U) ? ~0UL : (unsigned int)val;
+
+		if (sizeof(ulval) != sizeof(val) &&
+		    optlen >= sizeof(ulval) &&
+		    copy_from_sockptr(&ulval, optval, sizeof(ulval))) {
+			ret = -EFAULT;
+			break;
+		}
+		if (ulval != ~0UL)
+			cmpxchg(&sk->sk_pacing_status,
+				SK_PACING_NONE,
+				SK_PACING_NEEDED);
+		/* Pairs with READ_ONCE() from sk_getsockopt() */
+		WRITE_ONCE(sk->sk_max_pacing_rate, ulval);
+		sk->sk_pacing_rate = min(sk->sk_pacing_rate, ulval);
+		break;
+		}
+	case SO_INCOMING_CPU:
+		reuseport_update_incoming_cpu(sk, val);
+		break;
+
+	case SO_CNX_ADVICE:
+		if (val == 1)
+			dst_negative_advice(sk);
+		break;
+
+	case SO_ZEROCOPY:
+		if (sk->sk_family == PF_INET || sk->sk_family == PF_INET6) {
+			if (!(sk_is_tcp(sk) ||
+			      (sk->sk_type == SOCK_DGRAM &&
+			       sk->sk_protocol == IPPROTO_UDP)))
+				ret = -EOPNOTSUPP;
+		} else if (sk->sk_family != PF_RDS) {
+			ret = -EOPNOTSUPP;
+		}
+		if (!ret) {
+			if (val < 0 || val > 1)
+				ret = -EINVAL;
+			else
+				sock_valbool_flag(sk, SOCK_ZEROCOPY, valbool);
+		}
+		break;
+
+	case SO_TXTIME:
+		if (optlen != sizeof(struct sock_txtime)) {
+			ret = -EINVAL;
+			break;
+		} else if (copy_from_sockptr(&sk_txtime, optval,
+			   sizeof(struct sock_txtime))) {
+			ret = -EFAULT;
+			break;
+		} else if (sk_txtime.flags & ~SOF_TXTIME_FLAGS_MASK) {
+			ret = -EINVAL;
+			break;
+		}
+		/* CLOCK_MONOTONIC is only used by sch_fq, and this packet
+		 * scheduler has enough safe guards.
+		 */
+		if (sk_txtime.clockid != CLOCK_MONOTONIC &&
+		    !sockopt_ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) {
+			ret = -EPERM;
+			break;
+		}
+		sock_valbool_flag(sk, SOCK_TXTIME, true);
+		sk->sk_clockid = sk_txtime.clockid;
+		sk->sk_txtime_deadline_mode =
+			!!(sk_txtime.flags & SOF_TXTIME_DEADLINE_MODE);
+		sk->sk_txtime_report_errors =
+			!!(sk_txtime.flags & SOF_TXTIME_REPORT_ERRORS);
+		break;
+
+	case SO_BINDTOIFINDEX:
+		ret = sock_bindtoindex_locked(sk, val);
+		break;
+
+	case SO_BUF_LOCK:
+		if (val & ~SOCK_BUF_LOCK_MASK) {
+			ret = -EINVAL;
+			break;
+		}
+		sk->sk_userlocks = val | (sk->sk_userlocks &
+					  ~SOCK_BUF_LOCK_MASK);
+		break;
+
+	case SO_RESERVE_MEM:
+	{
+		int delta;
+
+		if (val < 0) {
+			ret = -EINVAL;
+			break;
+		}
+
+		delta = val - sk->sk_reserved_mem;
+		if (delta < 0)
+			sock_release_reserved_memory(sk, -delta);
+		else
+			ret = sock_reserve_memory(sk, delta);
+		break;
+	}
+
+	case SO_TXREHASH:
+		if (val < -1 || val > 1) {
+			ret = -EINVAL;
+			break;
+		}
+		if ((u8)val == SOCK_TXREHASH_DEFAULT)
+			val = READ_ONCE(sock_net(sk)->core.sysctl_txrehash);
+		/* Paired with READ_ONCE() in tcp_rtx_synack()
+		 * and sk_getsockopt().
+		 */
+		WRITE_ONCE(sk->sk_txrehash, (u8)val);
+		break;
+
+	default:
+		ret = -ENOPROTOOPT;
+		break;
+	}
+	sockopt_release_sock(sk);
+	return ret;
+}
+
+int sock_setsockopt(struct socket *sock, int level, int optname,
+		    sockptr_t optval, unsigned int optlen)
+{
+	return sk_setsockopt(sock->sk, level, optname,
+			     optval, optlen);
+}
+EXPORT_SYMBOL(sock_setsockopt);
+
+static const struct cred *sk_get_peer_cred(struct sock *sk)
+{
+	const struct cred *cred;
+
+	spin_lock(&sk->sk_peer_lock);
+	cred = get_cred(sk->sk_peer_cred);
+	spin_unlock(&sk->sk_peer_lock);
+
+	return cred;
+}
+
+static void cred_to_ucred(struct pid *pid, const struct cred *cred,
+			  struct ucred *ucred)
+{
+	ucred->pid = pid_vnr(pid);
+	ucred->uid = ucred->gid = -1;
+	if (cred) {
+		struct user_namespace *current_ns = current_user_ns();
+
+		ucred->uid = from_kuid_munged(current_ns, cred->euid);
+		ucred->gid = from_kgid_munged(current_ns, cred->egid);
+	}
+}
+
+static int groups_to_user(sockptr_t dst, const struct group_info *src)
+{
+	struct user_namespace *user_ns = current_user_ns();
+	int i;
+
+	for (i = 0; i < src->ngroups; i++) {
+		gid_t gid = from_kgid_munged(user_ns, src->gid[i]);
+
+		if (copy_to_sockptr_offset(dst, i * sizeof(gid), &gid, sizeof(gid)))
+			return -EFAULT;
+	}
+
+	return 0;
+}
+
+int sk_getsockopt(struct sock *sk, int level, int optname,
+		  sockptr_t optval, sockptr_t optlen)
+{
+	struct socket *sock = sk->sk_socket;
+
+	union {
+		int val;
+		u64 val64;
+		unsigned long ulval;
+		struct linger ling;
+		struct old_timeval32 tm32;
+		struct __kernel_old_timeval tm;
+		struct  __kernel_sock_timeval stm;
+		struct sock_txtime txtime;
+		struct so_timestamping timestamping;
+	} v;
+
+	int lv = sizeof(int);
+	int len;
+
+	if (copy_from_sockptr(&len, optlen, sizeof(int)))
+		return -EFAULT;
+	if (len < 0)
+		return -EINVAL;
+
+	memset(&v, 0, sizeof(v));
+
+	switch (optname) {
+	case SO_DEBUG:
+		v.val = sock_flag(sk, SOCK_DBG);
+		break;
+
+	case SO_DONTROUTE:
+		v.val = sock_flag(sk, SOCK_LOCALROUTE);
+		break;
+
+	case SO_BROADCAST:
+		v.val = sock_flag(sk, SOCK_BROADCAST);
+		break;
+
+	case SO_SNDBUF:
+		v.val = READ_ONCE(sk->sk_sndbuf);
+		break;
+
+	case SO_RCVBUF:
+		v.val = READ_ONCE(sk->sk_rcvbuf);
+		break;
+
+	case SO_REUSEADDR:
+		v.val = sk->sk_reuse;
+		break;
+
+	case SO_REUSEPORT:
+		v.val = sk->sk_reuseport;
+		break;
+
+	case SO_KEEPALIVE:
+		v.val = sock_flag(sk, SOCK_KEEPOPEN);
+		break;
+
+	case SO_TYPE:
+		v.val = sk->sk_type;
+		break;
+
+	case SO_PROTOCOL:
+		v.val = sk->sk_protocol;
+		break;
+
+	case SO_DOMAIN:
+		v.val = sk->sk_family;
+		break;
+
+	case SO_ERROR:
+		v.val = -sock_error(sk);
+		if (v.val == 0)
+			v.val = xchg(&sk->sk_err_soft, 0);
+		break;
+
+	case SO_OOBINLINE:
+		v.val = sock_flag(sk, SOCK_URGINLINE);
+		break;
+
+	case SO_NO_CHECK:
+		v.val = sk->sk_no_check_tx;
+		break;
+
+	case SO_PRIORITY:
+		v.val = READ_ONCE(sk->sk_priority);
+		break;
+
+	case SO_LINGER:
+		lv		= sizeof(v.ling);
+		v.ling.l_onoff	= sock_flag(sk, SOCK_LINGER);
+		v.ling.l_linger	= READ_ONCE(sk->sk_lingertime) / HZ;
+		break;
+
+	case SO_BSDCOMPAT:
+		break;
+
+	case SO_TIMESTAMP_OLD:
+		v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
+				!sock_flag(sk, SOCK_TSTAMP_NEW) &&
+				!sock_flag(sk, SOCK_RCVTSTAMPNS);
+		break;
+
+	case SO_TIMESTAMPNS_OLD:
+		v.val = sock_flag(sk, SOCK_RCVTSTAMPNS) && !sock_flag(sk, SOCK_TSTAMP_NEW);
+		break;
+
+	case SO_TIMESTAMP_NEW:
+		v.val = sock_flag(sk, SOCK_RCVTSTAMP) && sock_flag(sk, SOCK_TSTAMP_NEW);
+		break;
+
+	case SO_TIMESTAMPNS_NEW:
+		v.val = sock_flag(sk, SOCK_RCVTSTAMPNS) && sock_flag(sk, SOCK_TSTAMP_NEW);
+		break;
+
+	case SO_TIMESTAMPING_OLD:
+	case SO_TIMESTAMPING_NEW:
+		lv = sizeof(v.timestamping);
+		/* For the later-added case SO_TIMESTAMPING_NEW: Be strict about only
+		 * returning the flags when they were set through the same option.
+		 * Don't change the beviour for the old case SO_TIMESTAMPING_OLD.
+		 */
+		if (optname == SO_TIMESTAMPING_OLD || sock_flag(sk, SOCK_TSTAMP_NEW)) {
+			v.timestamping.flags = READ_ONCE(sk->sk_tsflags);
+			v.timestamping.bind_phc = READ_ONCE(sk->sk_bind_phc);
+		}
+		break;
+
+	case SO_RCVTIMEO_OLD:
+	case SO_RCVTIMEO_NEW:
+		lv = sock_get_timeout(READ_ONCE(sk->sk_rcvtimeo), &v,
+				      SO_RCVTIMEO_OLD == optname);
+		break;
+
+	case SO_SNDTIMEO_OLD:
+	case SO_SNDTIMEO_NEW:
+		lv = sock_get_timeout(READ_ONCE(sk->sk_sndtimeo), &v,
+				      SO_SNDTIMEO_OLD == optname);
+		break;
+
+	case SO_RCVLOWAT:
+		v.val = READ_ONCE(sk->sk_rcvlowat);
+		break;
+
+	case SO_SNDLOWAT:
+		v.val = 1;
+		break;
+
+	case SO_PASSCRED:
+		v.val = !!test_bit(SOCK_PASSCRED, &sock->flags);
+		break;
+
+	case SO_PEERCRED:
+	{
+		struct ucred peercred;
+		if (len > sizeof(peercred))
+			len = sizeof(peercred);
+
+		spin_lock(&sk->sk_peer_lock);
+		cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred);
+		spin_unlock(&sk->sk_peer_lock);
+
+		if (copy_to_sockptr(optval, &peercred, len))
+			return -EFAULT;
+		goto lenout;
+	}
+
+	case SO_PEERGROUPS:
+	{
+		const struct cred *cred;
+		int ret, n;
+
+		cred = sk_get_peer_cred(sk);
+		if (!cred)
+			return -ENODATA;
+
+		n = cred->group_info->ngroups;
+		if (len < n * sizeof(gid_t)) {
+			len = n * sizeof(gid_t);
+			put_cred(cred);
+			return copy_to_sockptr(optlen, &len, sizeof(int)) ? -EFAULT : -ERANGE;
+		}
+		len = n * sizeof(gid_t);
+
+		ret = groups_to_user(optval, cred->group_info);
+		put_cred(cred);
+		if (ret)
+			return ret;
+		goto lenout;
+	}
+
+	case SO_PEERNAME:
+	{
+		struct sockaddr_storage address;
+
+		lv = sock->ops->getname(sock, (struct sockaddr *)&address, 2);
+		if (lv < 0)
+			return -ENOTCONN;
+		if (lv < len)
+			return -EINVAL;
+		if (copy_to_sockptr(optval, &address, len))
+			return -EFAULT;
+		goto lenout;
+	}
+
+	/* Dubious BSD thing... Probably nobody even uses it, but
+	 * the UNIX standard wants it for whatever reason... -DaveM
+	 */
+	case SO_ACCEPTCONN:
+		v.val = sk->sk_state == TCP_LISTEN;
+		break;
+
+	case SO_PASSSEC:
+		v.val = !!test_bit(SOCK_PASSSEC, &sock->flags);
+		break;
+
+	case SO_PEERSEC:
+		return security_socket_getpeersec_stream(sock, optval.user, optlen.user, len);
+
+	case SO_MARK:
+		v.val = READ_ONCE(sk->sk_mark);
+		break;
+
+	case SO_RCVMARK:
+		v.val = sock_flag(sk, SOCK_RCVMARK);
+		break;
+
+	case SO_RXQ_OVFL:
+		v.val = sock_flag(sk, SOCK_RXQ_OVFL);
+		break;
+
+	case SO_WIFI_STATUS:
+		v.val = sock_flag(sk, SOCK_WIFI_STATUS);
+		break;
+
+	case SO_PEEK_OFF:
+		if (!sock->ops->set_peek_off)
+			return -EOPNOTSUPP;
+
+		v.val = READ_ONCE(sk->sk_peek_off);
+		break;
+	case SO_NOFCS:
+		v.val = sock_flag(sk, SOCK_NOFCS);
+		break;
+
+	case SO_BINDTODEVICE:
+		return sock_getbindtodevice(sk, optval, optlen, len);
+
+	case SO_GET_FILTER:
+		len = sk_get_filter(sk, optval, len);
+		if (len < 0)
+			return len;
+
+		goto lenout;
+
+	case SO_LOCK_FILTER:
+		v.val = sock_flag(sk, SOCK_FILTER_LOCKED);
+		break;
+
+	case SO_BPF_EXTENSIONS:
+		v.val = bpf_tell_extensions();
+		break;
+
+	case SO_SELECT_ERR_QUEUE:
+		v.val = sock_flag(sk, SOCK_SELECT_ERR_QUEUE);
+		break;
+
+#ifdef CONFIG_NET_RX_BUSY_POLL
+	case SO_BUSY_POLL:
+		v.val = READ_ONCE(sk->sk_ll_usec);
+		break;
+	case SO_PREFER_BUSY_POLL:
+		v.val = READ_ONCE(sk->sk_prefer_busy_poll);
+		break;
+#endif
+
+	case SO_MAX_PACING_RATE:
+		/* The READ_ONCE() pair with the WRITE_ONCE() in sk_setsockopt() */
+		if (sizeof(v.ulval) != sizeof(v.val) && len >= sizeof(v.ulval)) {
+			lv = sizeof(v.ulval);
+			v.ulval = READ_ONCE(sk->sk_max_pacing_rate);
+		} else {
+			/* 32bit version */
+			v.val = min_t(unsigned long, ~0U,
+				      READ_ONCE(sk->sk_max_pacing_rate));
+		}
+		break;
+
+	case SO_INCOMING_CPU:
+		v.val = READ_ONCE(sk->sk_incoming_cpu);
+		break;
+
+	case SO_MEMINFO:
+	{
+		u32 meminfo[SK_MEMINFO_VARS];
+
+		sk_get_meminfo(sk, meminfo);
+
+		len = min_t(unsigned int, len, sizeof(meminfo));
+		if (copy_to_sockptr(optval, &meminfo, len))
+			return -EFAULT;
+
+		goto lenout;
+	}
+
+#ifdef CONFIG_NET_RX_BUSY_POLL
+	case SO_INCOMING_NAPI_ID:
+		v.val = READ_ONCE(sk->sk_napi_id);
+
+		/* aggregate non-NAPI IDs down to 0 */
+		if (v.val < MIN_NAPI_ID)
+			v.val = 0;
+
+		break;
+#endif
+
+	case SO_COOKIE:
+		lv = sizeof(u64);
+		if (len < lv)
+			return -EINVAL;
+		v.val64 = sock_gen_cookie(sk);
+		break;
+
+	case SO_ZEROCOPY:
+		v.val = sock_flag(sk, SOCK_ZEROCOPY);
+		break;
+
+	case SO_TXTIME:
+		lv = sizeof(v.txtime);
+		v.txtime.clockid = sk->sk_clockid;
+		v.txtime.flags |= sk->sk_txtime_deadline_mode ?
+				  SOF_TXTIME_DEADLINE_MODE : 0;
+		v.txtime.flags |= sk->sk_txtime_report_errors ?
+				  SOF_TXTIME_REPORT_ERRORS : 0;
+		break;
+
+	case SO_BINDTOIFINDEX:
+		v.val = READ_ONCE(sk->sk_bound_dev_if);
+		break;
+
+	case SO_NETNS_COOKIE:
+		lv = sizeof(u64);
+		if (len != lv)
+			return -EINVAL;
+		v.val64 = sock_net(sk)->net_cookie;
+		break;
+
+	case SO_BUF_LOCK:
+		v.val = sk->sk_userlocks & SOCK_BUF_LOCK_MASK;
+		break;
+
+	case SO_RESERVE_MEM:
+		v.val = READ_ONCE(sk->sk_reserved_mem);
+		break;
+
+	case SO_TXREHASH:
+		/* Paired with WRITE_ONCE() in sk_setsockopt() */
+		v.val = READ_ONCE(sk->sk_txrehash);
+		break;
+
+	default:
+		/* We implement the SO_SNDLOWAT etc to not be settable
+		 * (1003.1g 7).
+		 */
+		return -ENOPROTOOPT;
+	}
+
+	if (len > lv)
+		len = lv;
+	if (copy_to_sockptr(optval, &v, len))
+		return -EFAULT;
+lenout:
+	if (copy_to_sockptr(optlen, &len, sizeof(int)))
+		return -EFAULT;
+	return 0;
+}
+
+int sock_getsockopt(struct socket *sock, int level, int optname,
+		    char __user *optval, int __user *optlen)
+{
+	return sk_getsockopt(sock->sk, level, optname,
+			     USER_SOCKPTR(optval),
+			     USER_SOCKPTR(optlen));
+}
+
+/*
+ * Initialize an sk_lock.
+ *
+ * (We also register the sk_lock with the lock validator.)
+ */
+static inline void sock_lock_init(struct sock *sk)
+{
+	if (sk->sk_kern_sock)
+		sock_lock_init_class_and_name(
+			sk,
+			af_family_kern_slock_key_strings[sk->sk_family],
+			af_family_kern_slock_keys + sk->sk_family,
+			af_family_kern_key_strings[sk->sk_family],
+			af_family_kern_keys + sk->sk_family);
+	else
+		sock_lock_init_class_and_name(
+			sk,
+			af_family_slock_key_strings[sk->sk_family],
+			af_family_slock_keys + sk->sk_family,
+			af_family_key_strings[sk->sk_family],
+			af_family_keys + sk->sk_family);
+}
+
+/*
+ * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
+ * even temporarly, because of RCU lookups. sk_node should also be left as is.
+ * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end
+ */
+static void sock_copy(struct sock *nsk, const struct sock *osk)
+{
+	const struct proto *prot = READ_ONCE(osk->sk_prot);
+#ifdef CONFIG_SECURITY_NETWORK
+	void *sptr = nsk->sk_security;
+#endif
+
+	/* If we move sk_tx_queue_mapping out of the private section,
+	 * we must check if sk_tx_queue_clear() is called after
+	 * sock_copy() in sk_clone_lock().
+	 */
+	BUILD_BUG_ON(offsetof(struct sock, sk_tx_queue_mapping) <
+		     offsetof(struct sock, sk_dontcopy_begin) ||
+		     offsetof(struct sock, sk_tx_queue_mapping) >=
+		     offsetof(struct sock, sk_dontcopy_end));
+
+	memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin));
+
+	memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end,
+	       prot->obj_size - offsetof(struct sock, sk_dontcopy_end));
+
+#ifdef CONFIG_SECURITY_NETWORK
+	nsk->sk_security = sptr;
+	security_sk_clone(osk, nsk);
+#endif
+}
+
+static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
+		int family)
+{
+	struct sock *sk;
+	struct kmem_cache *slab;
+
+	slab = prot->slab;
+	if (slab != NULL) {
+		sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
+		if (!sk)
+			return sk;
+		if (want_init_on_alloc(priority))
+			sk_prot_clear_nulls(sk, prot->obj_size);
+	} else
+		sk = kmalloc(prot->obj_size, priority);
+
+	if (sk != NULL) {
+		if (security_sk_alloc(sk, family, priority))
+			goto out_free;
+
+		if (!try_module_get(prot->owner))
+			goto out_free_sec;
+	}
+
+	return sk;
+
+out_free_sec:
+	security_sk_free(sk);
+out_free:
+	if (slab != NULL)
+		kmem_cache_free(slab, sk);
+	else
+		kfree(sk);
+	return NULL;
+}
+
+static void sk_prot_free(struct proto *prot, struct sock *sk)
+{
+	struct kmem_cache *slab;
+	struct module *owner;
+
+	owner = prot->owner;
+	slab = prot->slab;
+
+	cgroup_sk_free(&sk->sk_cgrp_data);
+	mem_cgroup_sk_free(sk);
+	security_sk_free(sk);
+	if (slab != NULL)
+		kmem_cache_free(slab, sk);
+	else
+		kfree(sk);
+	module_put(owner);
+}
+
+/**
+ *	sk_alloc - All socket objects are allocated here
+ *	@net: the applicable net namespace
+ *	@family: protocol family
+ *	@priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
+ *	@prot: struct proto associated with this new sock instance
+ *	@kern: is this to be a kernel socket?
+ */
+struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
+		      struct proto *prot, int kern)
+{
+	struct sock *sk;
+
+	sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
+	if (sk) {
+		sk->sk_family = family;
+		/*
+		 * See comment in struct sock definition to understand
+		 * why we need sk_prot_creator -acme
+		 */
+		sk->sk_prot = sk->sk_prot_creator = prot;
+		sk->sk_kern_sock = kern;
+		sock_lock_init(sk);
+		sk->sk_net_refcnt = kern ? 0 : 1;
+		if (likely(sk->sk_net_refcnt)) {
+			get_net_track(net, &sk->ns_tracker, priority);
+			sock_inuse_add(net, 1);
+		}
+
+		sock_net_set(sk, net);
+		refcount_set(&sk->sk_wmem_alloc, 1);
+
+		mem_cgroup_sk_alloc(sk);
+		cgroup_sk_alloc(&sk->sk_cgrp_data);
+		sock_update_classid(&sk->sk_cgrp_data);
+		sock_update_netprioidx(&sk->sk_cgrp_data);
+		sk_tx_queue_clear(sk);
+	}
+
+	return sk;
+}
+EXPORT_SYMBOL(sk_alloc);
+
+/* Sockets having SOCK_RCU_FREE will call this function after one RCU
+ * grace period. This is the case for UDP sockets and TCP listeners.
+ */
+static void __sk_destruct(struct rcu_head *head)
+{
+	struct sock *sk = container_of(head, struct sock, sk_rcu);
+	struct sk_filter *filter;
+
+	if (sk->sk_destruct)
+		sk->sk_destruct(sk);
+
+	filter = rcu_dereference_check(sk->sk_filter,
+				       refcount_read(&sk->sk_wmem_alloc) == 0);
+	if (filter) {
+		sk_filter_uncharge(sk, filter);
+		RCU_INIT_POINTER(sk->sk_filter, NULL);
+	}
+
+	sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP);
+
+#ifdef CONFIG_BPF_SYSCALL
+	bpf_sk_storage_free(sk);
+#endif
+
+	if (atomic_read(&sk->sk_omem_alloc))
+		pr_debug("%s: optmem leakage (%d bytes) detected\n",
+			 __func__, atomic_read(&sk->sk_omem_alloc));
+
+	if (sk->sk_frag.page) {
+		put_page(sk->sk_frag.page);
+		sk->sk_frag.page = NULL;
+	}
+
+	/* We do not need to acquire sk->sk_peer_lock, we are the last user. */
+	put_cred(sk->sk_peer_cred);
+	put_pid(sk->sk_peer_pid);
+
+	if (likely(sk->sk_net_refcnt))
+		put_net_track(sock_net(sk), &sk->ns_tracker);
+	sk_prot_free(sk->sk_prot_creator, sk);
+}
+
+void sk_destruct(struct sock *sk)
+{
+	bool use_call_rcu = sock_flag(sk, SOCK_RCU_FREE);
+
+	if (rcu_access_pointer(sk->sk_reuseport_cb)) {
+		reuseport_detach_sock(sk);
+		use_call_rcu = true;
+	}
+
+	if (use_call_rcu)
+		call_rcu(&sk->sk_rcu, __sk_destruct);
+	else
+		__sk_destruct(&sk->sk_rcu);
+}
+
+static void __sk_free(struct sock *sk)
+{
+	if (likely(sk->sk_net_refcnt))
+		sock_inuse_add(sock_net(sk), -1);
+
+	if (unlikely(sk->sk_net_refcnt && sock_diag_has_destroy_listeners(sk)))
+		sock_diag_broadcast_destroy(sk);
+	else
+		sk_destruct(sk);
+}
+
+void sk_free(struct sock *sk)
+{
+	/*
+	 * We subtract one from sk_wmem_alloc and can know if
+	 * some packets are still in some tx queue.
+	 * If not null, sock_wfree() will call __sk_free(sk) later
+	 */
+	if (refcount_dec_and_test(&sk->sk_wmem_alloc))
+		__sk_free(sk);
+}
+EXPORT_SYMBOL(sk_free);
+
+static void sk_init_common(struct sock *sk)
+{
+	skb_queue_head_init(&sk->sk_receive_queue);
+	skb_queue_head_init(&sk->sk_write_queue);
+	skb_queue_head_init(&sk->sk_error_queue);
+
+	rwlock_init(&sk->sk_callback_lock);
+	lockdep_set_class_and_name(&sk->sk_receive_queue.lock,
+			af_rlock_keys + sk->sk_family,
+			af_family_rlock_key_strings[sk->sk_family]);
+	lockdep_set_class_and_name(&sk->sk_write_queue.lock,
+			af_wlock_keys + sk->sk_family,
+			af_family_wlock_key_strings[sk->sk_family]);
+	lockdep_set_class_and_name(&sk->sk_error_queue.lock,
+			af_elock_keys + sk->sk_family,
+			af_family_elock_key_strings[sk->sk_family]);
+	lockdep_set_class_and_name(&sk->sk_callback_lock,
+			af_callback_keys + sk->sk_family,
+			af_family_clock_key_strings[sk->sk_family]);
+}
+
+/**
+ *	sk_clone_lock - clone a socket, and lock its clone
+ *	@sk: the socket to clone
+ *	@priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
+ *
+ *	Caller must unlock socket even in error path (bh_unlock_sock(newsk))
+ */
+struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
+{
+	struct proto *prot = READ_ONCE(sk->sk_prot);
+	struct sk_filter *filter;
+	bool is_charged = true;
+	struct sock *newsk;
+
+	newsk = sk_prot_alloc(prot, priority, sk->sk_family);
+	if (!newsk)
+		goto out;
+
+	sock_copy(newsk, sk);
+
+	newsk->sk_prot_creator = prot;
+
+	/* SANITY */
+	if (likely(newsk->sk_net_refcnt)) {
+		get_net_track(sock_net(newsk), &newsk->ns_tracker, priority);
+		sock_inuse_add(sock_net(newsk), 1);
+	}
+	sk_node_init(&newsk->sk_node);
+	sock_lock_init(newsk);
+	bh_lock_sock(newsk);
+	newsk->sk_backlog.head	= newsk->sk_backlog.tail = NULL;
+	newsk->sk_backlog.len = 0;
+
+	atomic_set(&newsk->sk_rmem_alloc, 0);
+
+	/* sk_wmem_alloc set to one (see sk_free() and sock_wfree()) */
+	refcount_set(&newsk->sk_wmem_alloc, 1);
+
+	atomic_set(&newsk->sk_omem_alloc, 0);
+	sk_init_common(newsk);
+
+	newsk->sk_dst_cache	= NULL;
+	newsk->sk_dst_pending_confirm = 0;
+	newsk->sk_wmem_queued	= 0;
+	newsk->sk_forward_alloc = 0;
+	newsk->sk_reserved_mem  = 0;
+	atomic_set(&newsk->sk_drops, 0);
+	newsk->sk_send_head	= NULL;
+	newsk->sk_userlocks	= sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
+	atomic_set(&newsk->sk_zckey, 0);
+
+	sock_reset_flag(newsk, SOCK_DONE);
+
+	/* sk->sk_memcg will be populated at accept() time */
+	newsk->sk_memcg = NULL;
+
+	cgroup_sk_clone(&newsk->sk_cgrp_data);
+
+	rcu_read_lock();
+	filter = rcu_dereference(sk->sk_filter);
+	if (filter != NULL)
+		/* though it's an empty new sock, the charging may fail
+		 * if sysctl_optmem_max was changed between creation of
+		 * original socket and cloning
+		 */
+		is_charged = sk_filter_charge(newsk, filter);
+	RCU_INIT_POINTER(newsk->sk_filter, filter);
+	rcu_read_unlock();
+
+	if (unlikely(!is_charged || xfrm_sk_clone_policy(newsk, sk))) {
+		/* We need to make sure that we don't uncharge the new
+		 * socket if we couldn't charge it in the first place
+		 * as otherwise we uncharge the parent's filter.
+		 */
+		if (!is_charged)
+			RCU_INIT_POINTER(newsk->sk_filter, NULL);
+		sk_free_unlock_clone(newsk);
+		newsk = NULL;
+		goto out;
+	}
+	RCU_INIT_POINTER(newsk->sk_reuseport_cb, NULL);
+
+	if (bpf_sk_storage_clone(sk, newsk)) {
+		sk_free_unlock_clone(newsk);
+		newsk = NULL;
+		goto out;
+	}
+
+	/* Clear sk_user_data if parent had the pointer tagged
+	 * as not suitable for copying when cloning.
+	 */
+	if (sk_user_data_is_nocopy(newsk))
+		newsk->sk_user_data = NULL;
+
+	newsk->sk_err	   = 0;
+	newsk->sk_err_soft = 0;
+	newsk->sk_priority = 0;
+	newsk->sk_incoming_cpu = raw_smp_processor_id();
+
+	/* Before updating sk_refcnt, we must commit prior changes to memory
+	 * (Documentation/RCU/rculist_nulls.rst for details)
+	 */
+	smp_wmb();
+	refcount_set(&newsk->sk_refcnt, 2);
+
+	/* Increment the counter in the same struct proto as the master
+	 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
+	 * is the same as sk->sk_prot->socks, as this field was copied
+	 * with memcpy).
+	 *
+	 * This _changes_ the previous behaviour, where
+	 * tcp_create_openreq_child always was incrementing the
+	 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
+	 * to be taken into account in all callers. -acme
+	 */
+	sk_refcnt_debug_inc(newsk);
+	sk_set_socket(newsk, NULL);
+	sk_tx_queue_clear(newsk);
+	RCU_INIT_POINTER(newsk->sk_wq, NULL);
+
+	if (newsk->sk_prot->sockets_allocated)
+		sk_sockets_allocated_inc(newsk);
+
+	if (sock_needs_netstamp(sk) && newsk->sk_flags & SK_FLAGS_TIMESTAMP)
+		net_enable_timestamp();
+out:
+	return newsk;
+}
+EXPORT_SYMBOL_GPL(sk_clone_lock);
+
+void sk_free_unlock_clone(struct sock *sk)
+{
+	/* It is still raw copy of parent, so invalidate
+	 * destructor and make plain sk_free() */
+	sk->sk_destruct = NULL;
+	bh_unlock_sock(sk);
+	sk_free(sk);
+}
+EXPORT_SYMBOL_GPL(sk_free_unlock_clone);
+
+static void sk_trim_gso_size(struct sock *sk)
+{
+	if (sk->sk_gso_max_size <= GSO_LEGACY_MAX_SIZE)
+		return;
+#if IS_ENABLED(CONFIG_IPV6)
+	if (sk->sk_family == AF_INET6 &&
+	    sk_is_tcp(sk) &&
+	    !ipv6_addr_v4mapped(&sk->sk_v6_rcv_saddr))
+		return;
+#endif
+	sk->sk_gso_max_size = GSO_LEGACY_MAX_SIZE;
+}
+
+void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
+{
+	u32 max_segs = 1;
+
+	sk->sk_route_caps = dst->dev->features;
+	if (sk_is_tcp(sk))
+		sk->sk_route_caps |= NETIF_F_GSO;
+	if (sk->sk_route_caps & NETIF_F_GSO)
+		sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
+	if (unlikely(sk->sk_gso_disabled))
+		sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
+	if (sk_can_gso(sk)) {
+		if (dst->header_len && !xfrm_dst_offload_ok(dst)) {
+			sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
+		} else {
+			sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
+			/* pairs with the WRITE_ONCE() in netif_set_gso_max_size() */
+			sk->sk_gso_max_size = READ_ONCE(dst->dev->gso_max_size);
+			sk_trim_gso_size(sk);
+			sk->sk_gso_max_size -= (MAX_TCP_HEADER + 1);
+			/* pairs with the WRITE_ONCE() in netif_set_gso_max_segs() */
+			max_segs = max_t(u32, READ_ONCE(dst->dev->gso_max_segs), 1);
+		}
+	}
+	sk->sk_gso_max_segs = max_segs;
+	sk_dst_set(sk, dst);
+}
+EXPORT_SYMBOL_GPL(sk_setup_caps);
+
+/*
+ *	Simple resource managers for sockets.
+ */
+
+
+/*
+ * Write buffer destructor automatically called from kfree_skb.
+ */
+void sock_wfree(struct sk_buff *skb)
+{
+	struct sock *sk = skb->sk;
+	unsigned int len = skb->truesize;
+	bool free;
+
+	if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
+		if (sock_flag(sk, SOCK_RCU_FREE) &&
+		    sk->sk_write_space == sock_def_write_space) {
+			rcu_read_lock();
+			free = refcount_sub_and_test(len, &sk->sk_wmem_alloc);
+			sock_def_write_space_wfree(sk);
+			rcu_read_unlock();
+			if (unlikely(free))
+				__sk_free(sk);
+			return;
+		}
+
+		/*
+		 * Keep a reference on sk_wmem_alloc, this will be released
+		 * after sk_write_space() call
+		 */
+		WARN_ON(refcount_sub_and_test(len - 1, &sk->sk_wmem_alloc));
+		sk->sk_write_space(sk);
+		len = 1;
+	}
+	/*
+	 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
+	 * could not do because of in-flight packets
+	 */
+	if (refcount_sub_and_test(len, &sk->sk_wmem_alloc))
+		__sk_free(sk);
+}
+EXPORT_SYMBOL(sock_wfree);
+
+/* This variant of sock_wfree() is used by TCP,
+ * since it sets SOCK_USE_WRITE_QUEUE.
+ */
+void __sock_wfree(struct sk_buff *skb)
+{
+	struct sock *sk = skb->sk;
+
+	if (refcount_sub_and_test(skb->truesize, &sk->sk_wmem_alloc))
+		__sk_free(sk);
+}
+
+void skb_set_owner_w(struct sk_buff *skb, struct sock *sk)
+{
+	skb_orphan(skb);
+	skb->sk = sk;
+#ifdef CONFIG_INET
+	if (unlikely(!sk_fullsock(sk))) {
+		skb->destructor = sock_edemux;
+		sock_hold(sk);
+		return;
+	}
+#endif
+	skb->destructor = sock_wfree;
+	skb_set_hash_from_sk(skb, sk);
+	/*
+	 * We used to take a refcount on sk, but following operation
+	 * is enough to guarantee sk_free() wont free this sock until
+	 * all in-flight packets are completed
+	 */
+	refcount_add(skb->truesize, &sk->sk_wmem_alloc);
+}
+EXPORT_SYMBOL(skb_set_owner_w);
+
+static bool can_skb_orphan_partial(const struct sk_buff *skb)
+{
+#ifdef CONFIG_TLS_DEVICE
+	/* Drivers depend on in-order delivery for crypto offload,
+	 * partial orphan breaks out-of-order-OK logic.
+	 */
+	if (skb->decrypted)
+		return false;
+#endif
+	return (skb->destructor == sock_wfree ||
+		(IS_ENABLED(CONFIG_INET) && skb->destructor == tcp_wfree));
+}
+
+/* This helper is used by netem, as it can hold packets in its
+ * delay queue. We want to allow the owner socket to send more
+ * packets, as if they were already TX completed by a typical driver.
+ * But we also want to keep skb->sk set because some packet schedulers
+ * rely on it (sch_fq for example).
+ */
+void skb_orphan_partial(struct sk_buff *skb)
+{
+	if (skb_is_tcp_pure_ack(skb))
+		return;
+
+	if (can_skb_orphan_partial(skb) && skb_set_owner_sk_safe(skb, skb->sk))
+		return;
+
+	skb_orphan(skb);
+}
+EXPORT_SYMBOL(skb_orphan_partial);
+
+/*
+ * Read buffer destructor automatically called from kfree_skb.
+ */
+void sock_rfree(struct sk_buff *skb)
+{
+	struct sock *sk = skb->sk;
+	unsigned int len = skb->truesize;
+
+	atomic_sub(len, &sk->sk_rmem_alloc);
+	sk_mem_uncharge(sk, len);
+}
+EXPORT_SYMBOL(sock_rfree);
+
+/*
+ * Buffer destructor for skbs that are not used directly in read or write
+ * path, e.g. for error handler skbs. Automatically called from kfree_skb.
+ */
+void sock_efree(struct sk_buff *skb)
+{
+	sock_put(skb->sk);
+}
+EXPORT_SYMBOL(sock_efree);
+
+/* Buffer destructor for prefetch/receive path where reference count may
+ * not be held, e.g. for listen sockets.
+ */
+#ifdef CONFIG_INET
+void sock_pfree(struct sk_buff *skb)
+{
+	if (sk_is_refcounted(skb->sk))
+		sock_gen_put(skb->sk);
+}
+EXPORT_SYMBOL(sock_pfree);
+#endif /* CONFIG_INET */
+
+kuid_t sock_i_uid(struct sock *sk)
+{
+	kuid_t uid;
+
+	read_lock_bh(&sk->sk_callback_lock);
+	uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID;
+	read_unlock_bh(&sk->sk_callback_lock);
+	return uid;
+}
+EXPORT_SYMBOL(sock_i_uid);
+
+unsigned long __sock_i_ino(struct sock *sk)
+{
+	unsigned long ino;
+
+	read_lock(&sk->sk_callback_lock);
+	ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
+	read_unlock(&sk->sk_callback_lock);
+	return ino;
+}
+EXPORT_SYMBOL(__sock_i_ino);
+
+unsigned long sock_i_ino(struct sock *sk)
+{
+	unsigned long ino;
+
+	local_bh_disable();
+	ino = __sock_i_ino(sk);
+	local_bh_enable();
+	return ino;
+}
+EXPORT_SYMBOL(sock_i_ino);
+
+/*
+ * Allocate a skb from the socket's send buffer.
+ */
+struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
+			     gfp_t priority)
+{
+	if (force ||
+	    refcount_read(&sk->sk_wmem_alloc) < READ_ONCE(sk->sk_sndbuf)) {
+		struct sk_buff *skb = alloc_skb(size, priority);
+
+		if (skb) {
+			skb_set_owner_w(skb, sk);
+			return skb;
+		}
+	}
+	return NULL;
+}
+EXPORT_SYMBOL(sock_wmalloc);
+
+static void sock_ofree(struct sk_buff *skb)
+{
+	struct sock *sk = skb->sk;
+
+	atomic_sub(skb->truesize, &sk->sk_omem_alloc);
+}
+
+struct sk_buff *sock_omalloc(struct sock *sk, unsigned long size,
+			     gfp_t priority)
+{
+	struct sk_buff *skb;
+
+	/* small safe race: SKB_TRUESIZE may differ from final skb->truesize */
+	if (atomic_read(&sk->sk_omem_alloc) + SKB_TRUESIZE(size) >
+	    READ_ONCE(sysctl_optmem_max))
+		return NULL;
+
+	skb = alloc_skb(size, priority);
+	if (!skb)
+		return NULL;
+
+	atomic_add(skb->truesize, &sk->sk_omem_alloc);
+	skb->sk = sk;
+	skb->destructor = sock_ofree;
+	return skb;
+}
+
+/*
+ * Allocate a memory block from the socket's option memory buffer.
+ */
+void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
+{
+	int optmem_max = READ_ONCE(sysctl_optmem_max);
+
+	if ((unsigned int)size <= optmem_max &&
+	    atomic_read(&sk->sk_omem_alloc) + size < optmem_max) {
+		void *mem;
+		/* First do the add, to avoid the race if kmalloc
+		 * might sleep.
+		 */
+		atomic_add(size, &sk->sk_omem_alloc);
+		mem = kmalloc(size, priority);
+		if (mem)
+			return mem;
+		atomic_sub(size, &sk->sk_omem_alloc);
+	}
+	return NULL;
+}
+EXPORT_SYMBOL(sock_kmalloc);
+
+/* Free an option memory block. Note, we actually want the inline
+ * here as this allows gcc to detect the nullify and fold away the
+ * condition entirely.
+ */
+static inline void __sock_kfree_s(struct sock *sk, void *mem, int size,
+				  const bool nullify)
+{
+	if (WARN_ON_ONCE(!mem))
+		return;
+	if (nullify)
+		kfree_sensitive(mem);
+	else
+		kfree(mem);
+	atomic_sub(size, &sk->sk_omem_alloc);
+}
+
+void sock_kfree_s(struct sock *sk, void *mem, int size)
+{
+	__sock_kfree_s(sk, mem, size, false);
+}
+EXPORT_SYMBOL(sock_kfree_s);
+
+void sock_kzfree_s(struct sock *sk, void *mem, int size)
+{
+	__sock_kfree_s(sk, mem, size, true);
+}
+EXPORT_SYMBOL(sock_kzfree_s);
+
+/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
+   I think, these locks should be removed for datagram sockets.
+ */
+static long sock_wait_for_wmem(struct sock *sk, long timeo)
+{
+	DEFINE_WAIT(wait);
+
+	sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk);
+	for (;;) {
+		if (!timeo)
+			break;
+		if (signal_pending(current))
+			break;
+		set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
+		prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
+		if (refcount_read(&sk->sk_wmem_alloc) < READ_ONCE(sk->sk_sndbuf))
+			break;
+		if (READ_ONCE(sk->sk_shutdown) & SEND_SHUTDOWN)
+			break;
+		if (READ_ONCE(sk->sk_err))
+			break;
+		timeo = schedule_timeout(timeo);
+	}
+	finish_wait(sk_sleep(sk), &wait);
+	return timeo;
+}
+
+
+/*
+ *	Generic send/receive buffer handlers
+ */
+
+struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
+				     unsigned long data_len, int noblock,
+				     int *errcode, int max_page_order)
+{
+	struct sk_buff *skb;
+	long timeo;
+	int err;
+
+	timeo = sock_sndtimeo(sk, noblock);
+	for (;;) {
+		err = sock_error(sk);
+		if (err != 0)
+			goto failure;
+
+		err = -EPIPE;
+		if (READ_ONCE(sk->sk_shutdown) & SEND_SHUTDOWN)
+			goto failure;
+
+		if (sk_wmem_alloc_get(sk) < READ_ONCE(sk->sk_sndbuf))
+			break;
+
+		sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
+		set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
+		err = -EAGAIN;
+		if (!timeo)
+			goto failure;
+		if (signal_pending(current))
+			goto interrupted;
+		timeo = sock_wait_for_wmem(sk, timeo);
+	}
+	skb = alloc_skb_with_frags(header_len, data_len, max_page_order,
+				   errcode, sk->sk_allocation);
+	if (skb)
+		skb_set_owner_w(skb, sk);
+	return skb;
+
+interrupted:
+	err = sock_intr_errno(timeo);
+failure:
+	*errcode = err;
+	return NULL;
+}
+EXPORT_SYMBOL(sock_alloc_send_pskb);
+
+int __sock_cmsg_send(struct sock *sk, struct msghdr *msg, struct cmsghdr *cmsg,
+		     struct sockcm_cookie *sockc)
+{
+	u32 tsflags;
+
+	switch (cmsg->cmsg_type) {
+	case SO_MARK:
+		if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_RAW) &&
+		    !ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
+			return -EPERM;
+		if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32)))
+			return -EINVAL;
+		sockc->mark = *(u32 *)CMSG_DATA(cmsg);
+		break;
+	case SO_TIMESTAMPING_OLD:
+	case SO_TIMESTAMPING_NEW:
+		if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32)))
+			return -EINVAL;
+
+		tsflags = *(u32 *)CMSG_DATA(cmsg);
+		if (tsflags & ~SOF_TIMESTAMPING_TX_RECORD_MASK)
+			return -EINVAL;
+
+		sockc->tsflags &= ~SOF_TIMESTAMPING_TX_RECORD_MASK;
+		sockc->tsflags |= tsflags;
+		break;
+	case SCM_TXTIME:
+		if (!sock_flag(sk, SOCK_TXTIME))
+			return -EINVAL;
+		if (cmsg->cmsg_len != CMSG_LEN(sizeof(u64)))
+			return -EINVAL;
+		sockc->transmit_time = get_unaligned((u64 *)CMSG_DATA(cmsg));
+		break;
+	/* SCM_RIGHTS and SCM_CREDENTIALS are semantically in SOL_UNIX. */
+	case SCM_RIGHTS:
+	case SCM_CREDENTIALS:
+		break;
+	default:
+		return -EINVAL;
+	}
+	return 0;
+}
+EXPORT_SYMBOL(__sock_cmsg_send);
+
+int sock_cmsg_send(struct sock *sk, struct msghdr *msg,
+		   struct sockcm_cookie *sockc)
+{
+	struct cmsghdr *cmsg;
+	int ret;
+
+	for_each_cmsghdr(cmsg, msg) {
+		if (!CMSG_OK(msg, cmsg))
+			return -EINVAL;
+		if (cmsg->cmsg_level != SOL_SOCKET)
+			continue;
+		ret = __sock_cmsg_send(sk, msg, cmsg, sockc);
+		if (ret)
+			return ret;
+	}
+	return 0;
+}
+EXPORT_SYMBOL(sock_cmsg_send);
+
+static void sk_enter_memory_pressure(struct sock *sk)
+{
+	if (!sk->sk_prot->enter_memory_pressure)
+		return;
+
+	sk->sk_prot->enter_memory_pressure(sk);
+}
+
+static void sk_leave_memory_pressure(struct sock *sk)
+{
+	if (sk->sk_prot->leave_memory_pressure) {
+		INDIRECT_CALL_INET_1(sk->sk_prot->leave_memory_pressure,
+				     tcp_leave_memory_pressure, sk);
+	} else {
+		unsigned long *memory_pressure = sk->sk_prot->memory_pressure;
+
+		if (memory_pressure && READ_ONCE(*memory_pressure))
+			WRITE_ONCE(*memory_pressure, 0);
+	}
+}
+
+DEFINE_STATIC_KEY_FALSE(net_high_order_alloc_disable_key);
+
+/**
+ * skb_page_frag_refill - check that a page_frag contains enough room
+ * @sz: minimum size of the fragment we want to get
+ * @pfrag: pointer to page_frag
+ * @gfp: priority for memory allocation
+ *
+ * Note: While this allocator tries to use high order pages, there is
+ * no guarantee that allocations succeed. Therefore, @sz MUST be
+ * less or equal than PAGE_SIZE.
+ */
+bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t gfp)
+{
+	if (pfrag->page) {
+		if (page_ref_count(pfrag->page) == 1) {
+			pfrag->offset = 0;
+			return true;
+		}
+		if (pfrag->offset + sz <= pfrag->size)
+			return true;
+		put_page(pfrag->page);
+	}
+
+	pfrag->offset = 0;
+	if (SKB_FRAG_PAGE_ORDER &&
+	    !static_branch_unlikely(&net_high_order_alloc_disable_key)) {
+		/* Avoid direct reclaim but allow kswapd to wake */
+		pfrag->page = alloc_pages((gfp & ~__GFP_DIRECT_RECLAIM) |
+					  __GFP_COMP | __GFP_NOWARN |
+					  __GFP_NORETRY,
+					  SKB_FRAG_PAGE_ORDER);
+		if (likely(pfrag->page)) {
+			pfrag->size = PAGE_SIZE << SKB_FRAG_PAGE_ORDER;
+			return true;
+		}
+	}
+	pfrag->page = alloc_page(gfp);
+	if (likely(pfrag->page)) {
+		pfrag->size = PAGE_SIZE;
+		return true;
+	}
+	return false;
+}
+EXPORT_SYMBOL(skb_page_frag_refill);
+
+bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag)
+{
+	if (likely(skb_page_frag_refill(32U, pfrag, sk->sk_allocation)))
+		return true;
+
+	sk_enter_memory_pressure(sk);
+	sk_stream_moderate_sndbuf(sk);
+	return false;
+}
+EXPORT_SYMBOL(sk_page_frag_refill);
+
+void __lock_sock(struct sock *sk)
+	__releases(&sk->sk_lock.slock)
+	__acquires(&sk->sk_lock.slock)
+{
+	DEFINE_WAIT(wait);
+
+	for (;;) {
+		prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
+					TASK_UNINTERRUPTIBLE);
+		spin_unlock_bh(&sk->sk_lock.slock);
+		schedule();
+		spin_lock_bh(&sk->sk_lock.slock);
+		if (!sock_owned_by_user(sk))
+			break;
+	}
+	finish_wait(&sk->sk_lock.wq, &wait);
+}
+
+void __release_sock(struct sock *sk)
+	__releases(&sk->sk_lock.slock)
+	__acquires(&sk->sk_lock.slock)
+{
+	struct sk_buff *skb, *next;
+
+	while ((skb = sk->sk_backlog.head) != NULL) {
+		sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
+
+		spin_unlock_bh(&sk->sk_lock.slock);
+
+		do {
+			next = skb->next;
+			prefetch(next);
+			DEBUG_NET_WARN_ON_ONCE(skb_dst_is_noref(skb));
+			skb_mark_not_on_list(skb);
+			sk_backlog_rcv(sk, skb);
+
+			cond_resched();
+
+			skb = next;
+		} while (skb != NULL);
+
+		spin_lock_bh(&sk->sk_lock.slock);
+	}
+
+	/*
+	 * Doing the zeroing here guarantee we can not loop forever
+	 * while a wild producer attempts to flood us.
+	 */
+	sk->sk_backlog.len = 0;
+}
+
+void __sk_flush_backlog(struct sock *sk)
+{
+	spin_lock_bh(&sk->sk_lock.slock);
+	__release_sock(sk);
+	spin_unlock_bh(&sk->sk_lock.slock);
+}
+EXPORT_SYMBOL_GPL(__sk_flush_backlog);
+
+/**
+ * sk_wait_data - wait for data to arrive at sk_receive_queue
+ * @sk:    sock to wait on
+ * @timeo: for how long
+ * @skb:   last skb seen on sk_receive_queue
+ *
+ * Now socket state including sk->sk_err is changed only under lock,
+ * hence we may omit checks after joining wait queue.
+ * We check receive queue before schedule() only as optimization;
+ * it is very likely that release_sock() added new data.
+ */
+int sk_wait_data(struct sock *sk, long *timeo, const struct sk_buff *skb)
+{
+	DEFINE_WAIT_FUNC(wait, woken_wake_function);
+	int rc;
+
+	add_wait_queue(sk_sleep(sk), &wait);
+	sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
+	rc = sk_wait_event(sk, timeo, skb_peek_tail(&sk->sk_receive_queue) != skb, &wait);
+	sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
+	remove_wait_queue(sk_sleep(sk), &wait);
+	return rc;
+}
+EXPORT_SYMBOL(sk_wait_data);
+
+/**
+ *	__sk_mem_raise_allocated - increase memory_allocated
+ *	@sk: socket
+ *	@size: memory size to allocate
+ *	@amt: pages to allocate
+ *	@kind: allocation type
+ *
+ *	Similar to __sk_mem_schedule(), but does not update sk_forward_alloc
+ */
+int __sk_mem_raise_allocated(struct sock *sk, int size, int amt, int kind)
+{
+	bool memcg_charge = mem_cgroup_sockets_enabled && sk->sk_memcg;
+	struct proto *prot = sk->sk_prot;
+	bool charged = true;
+	long allocated;
+
+	sk_memory_allocated_add(sk, amt);
+	allocated = sk_memory_allocated(sk);
+	if (memcg_charge &&
+	    !(charged = mem_cgroup_charge_skmem(sk->sk_memcg, amt,
+						gfp_memcg_charge())))
+		goto suppress_allocation;
+
+	/* Under limit. */
+	if (allocated <= sk_prot_mem_limits(sk, 0)) {
+		sk_leave_memory_pressure(sk);
+		return 1;
+	}
+
+	/* Under pressure. */
+	if (allocated > sk_prot_mem_limits(sk, 1))
+		sk_enter_memory_pressure(sk);
+
+	/* Over hard limit. */
+	if (allocated > sk_prot_mem_limits(sk, 2))
+		goto suppress_allocation;
+
+	/* guarantee minimum buffer size under pressure */
+	if (kind == SK_MEM_RECV) {
+		if (atomic_read(&sk->sk_rmem_alloc) < sk_get_rmem0(sk, prot))
+			return 1;
+
+	} else { /* SK_MEM_SEND */
+		int wmem0 = sk_get_wmem0(sk, prot);
+
+		if (sk->sk_type == SOCK_STREAM) {
+			if (sk->sk_wmem_queued < wmem0)
+				return 1;
+		} else if (refcount_read(&sk->sk_wmem_alloc) < wmem0) {
+				return 1;
+		}
+	}
+
+	if (sk_has_memory_pressure(sk)) {
+		u64 alloc;
+
+		if (!sk_under_memory_pressure(sk))
+			return 1;
+		alloc = sk_sockets_allocated_read_positive(sk);
+		if (sk_prot_mem_limits(sk, 2) > alloc *
+		    sk_mem_pages(sk->sk_wmem_queued +
+				 atomic_read(&sk->sk_rmem_alloc) +
+				 sk->sk_forward_alloc))
+			return 1;
+	}
+
+suppress_allocation:
+
+	if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
+		sk_stream_moderate_sndbuf(sk);
+
+		/* Fail only if socket is _under_ its sndbuf.
+		 * In this case we cannot block, so that we have to fail.
+		 */
+		if (sk->sk_wmem_queued + size >= sk->sk_sndbuf) {
+			/* Force charge with __GFP_NOFAIL */
+			if (memcg_charge && !charged) {
+				mem_cgroup_charge_skmem(sk->sk_memcg, amt,
+					gfp_memcg_charge() | __GFP_NOFAIL);
+			}
+			return 1;
+		}
+	}
+
+	if (kind == SK_MEM_SEND || (kind == SK_MEM_RECV && charged))
+		trace_sock_exceed_buf_limit(sk, prot, allocated, kind);
+
+	sk_memory_allocated_sub(sk, amt);
+
+	if (memcg_charge && charged)
+		mem_cgroup_uncharge_skmem(sk->sk_memcg, amt);
+
+	return 0;
+}
+
+/**
+ *	__sk_mem_schedule - increase sk_forward_alloc and memory_allocated
+ *	@sk: socket
+ *	@size: memory size to allocate
+ *	@kind: allocation type
+ *
+ *	If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
+ *	rmem allocation. This function assumes that protocols which have
+ *	memory_pressure use sk_wmem_queued as write buffer accounting.
+ */
+int __sk_mem_schedule(struct sock *sk, int size, int kind)
+{
+	int ret, amt = sk_mem_pages(size);
+
+	sk_forward_alloc_add(sk, amt << PAGE_SHIFT);
+	ret = __sk_mem_raise_allocated(sk, size, amt, kind);
+	if (!ret)
+		sk_forward_alloc_add(sk, -(amt << PAGE_SHIFT));
+	return ret;
+}
+EXPORT_SYMBOL(__sk_mem_schedule);
+
+/**
+ *	__sk_mem_reduce_allocated - reclaim memory_allocated
+ *	@sk: socket
+ *	@amount: number of quanta
+ *
+ *	Similar to __sk_mem_reclaim(), but does not update sk_forward_alloc
+ */
+void __sk_mem_reduce_allocated(struct sock *sk, int amount)
+{
+	sk_memory_allocated_sub(sk, amount);
+
+	if (mem_cgroup_sockets_enabled && sk->sk_memcg)
+		mem_cgroup_uncharge_skmem(sk->sk_memcg, amount);
+
+	if (sk_under_global_memory_pressure(sk) &&
+	    (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0)))
+		sk_leave_memory_pressure(sk);
+}
+
+/**
+ *	__sk_mem_reclaim - reclaim sk_forward_alloc and memory_allocated
+ *	@sk: socket
+ *	@amount: number of bytes (rounded down to a PAGE_SIZE multiple)
+ */
+void __sk_mem_reclaim(struct sock *sk, int amount)
+{
+	amount >>= PAGE_SHIFT;
+	sk_forward_alloc_add(sk, -(amount << PAGE_SHIFT));
+	__sk_mem_reduce_allocated(sk, amount);
+}
+EXPORT_SYMBOL(__sk_mem_reclaim);
+
+int sk_set_peek_off(struct sock *sk, int val)
+{
+	WRITE_ONCE(sk->sk_peek_off, val);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(sk_set_peek_off);
+
+/*
+ * Set of default routines for initialising struct proto_ops when
+ * the protocol does not support a particular function. In certain
+ * cases where it makes no sense for a protocol to have a "do nothing"
+ * function, some default processing is provided.
+ */
+
+int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
+{
+	return -EOPNOTSUPP;
+}
+EXPORT_SYMBOL(sock_no_bind);
+
+int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
+		    int len, int flags)
+{
+	return -EOPNOTSUPP;
+}
+EXPORT_SYMBOL(sock_no_connect);
+
+int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
+{
+	return -EOPNOTSUPP;
+}
+EXPORT_SYMBOL(sock_no_socketpair);
+
+int sock_no_accept(struct socket *sock, struct socket *newsock, int flags,
+		   bool kern)
+{
+	return -EOPNOTSUPP;
+}
+EXPORT_SYMBOL(sock_no_accept);
+
+int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
+		    int peer)
+{
+	return -EOPNOTSUPP;
+}
+EXPORT_SYMBOL(sock_no_getname);
+
+int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
+{
+	return -EOPNOTSUPP;
+}
+EXPORT_SYMBOL(sock_no_ioctl);
+
+int sock_no_listen(struct socket *sock, int backlog)
+{
+	return -EOPNOTSUPP;
+}
+EXPORT_SYMBOL(sock_no_listen);
+
+int sock_no_shutdown(struct socket *sock, int how)
+{
+	return -EOPNOTSUPP;
+}
+EXPORT_SYMBOL(sock_no_shutdown);
+
+int sock_no_sendmsg(struct socket *sock, struct msghdr *m, size_t len)
+{
+	return -EOPNOTSUPP;
+}
+EXPORT_SYMBOL(sock_no_sendmsg);
+
+int sock_no_sendmsg_locked(struct sock *sk, struct msghdr *m, size_t len)
+{
+	return -EOPNOTSUPP;
+}
+EXPORT_SYMBOL(sock_no_sendmsg_locked);
+
+int sock_no_recvmsg(struct socket *sock, struct msghdr *m, size_t len,
+		    int flags)
+{
+	return -EOPNOTSUPP;
+}
+EXPORT_SYMBOL(sock_no_recvmsg);
+
+int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
+{
+	/* Mirror missing mmap method error code */
+	return -ENODEV;
+}
+EXPORT_SYMBOL(sock_no_mmap);
+
+/*
+ * When a file is received (via SCM_RIGHTS, etc), we must bump the
+ * various sock-based usage counts.
+ */
+void __receive_sock(struct file *file)
+{
+	struct socket *sock;
+
+	sock = sock_from_file(file);
+	if (sock) {
+		sock_update_netprioidx(&sock->sk->sk_cgrp_data);
+		sock_update_classid(&sock->sk->sk_cgrp_data);
+	}
+}
+
+ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
+{
+	ssize_t res;
+	struct msghdr msg = {.msg_flags = flags};
+	struct kvec iov;
+	char *kaddr = kmap(page);
+	iov.iov_base = kaddr + offset;
+	iov.iov_len = size;
+	res = kernel_sendmsg(sock, &msg, &iov, 1, size);
+	kunmap(page);
+	return res;
+}
+EXPORT_SYMBOL(sock_no_sendpage);
+
+ssize_t sock_no_sendpage_locked(struct sock *sk, struct page *page,
+				int offset, size_t size, int flags)
+{
+	ssize_t res;
+	struct msghdr msg = {.msg_flags = flags};
+	struct kvec iov;
+	char *kaddr = kmap(page);
+
+	iov.iov_base = kaddr + offset;
+	iov.iov_len = size;
+	res = kernel_sendmsg_locked(sk, &msg, &iov, 1, size);
+	kunmap(page);
+	return res;
+}
+EXPORT_SYMBOL(sock_no_sendpage_locked);
+
+/*
+ *	Default Socket Callbacks
+ */
+
+static void sock_def_wakeup(struct sock *sk)
+{
+	struct socket_wq *wq;
+
+	rcu_read_lock();
+	wq = rcu_dereference(sk->sk_wq);
+	if (skwq_has_sleeper(wq))
+		wake_up_interruptible_all(&wq->wait);
+	rcu_read_unlock();
+}
+
+static void sock_def_error_report(struct sock *sk)
+{
+	struct socket_wq *wq;
+
+	rcu_read_lock();
+	wq = rcu_dereference(sk->sk_wq);
+	if (skwq_has_sleeper(wq))
+		wake_up_interruptible_poll(&wq->wait, EPOLLERR);
+	sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
+	rcu_read_unlock();
+}
+
+void sock_def_readable(struct sock *sk)
+{
+	struct socket_wq *wq;
+
+	rcu_read_lock();
+	wq = rcu_dereference(sk->sk_wq);
+	if (skwq_has_sleeper(wq))
+		wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN | EPOLLPRI |
+						EPOLLRDNORM | EPOLLRDBAND);
+	sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
+	rcu_read_unlock();
+}
+
+static void sock_def_write_space(struct sock *sk)
+{
+	struct socket_wq *wq;
+
+	rcu_read_lock();
+
+	/* Do not wake up a writer until he can make "significant"
+	 * progress.  --DaveM
+	 */
+	if (sock_writeable(sk)) {
+		wq = rcu_dereference(sk->sk_wq);
+		if (skwq_has_sleeper(wq))
+			wake_up_interruptible_sync_poll(&wq->wait, EPOLLOUT |
+						EPOLLWRNORM | EPOLLWRBAND);
+
+		/* Should agree with poll, otherwise some programs break */
+		sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
+	}
+
+	rcu_read_unlock();
+}
+
+/* An optimised version of sock_def_write_space(), should only be called
+ * for SOCK_RCU_FREE sockets under RCU read section and after putting
+ * ->sk_wmem_alloc.
+ */
+static void sock_def_write_space_wfree(struct sock *sk)
+{
+	/* Do not wake up a writer until he can make "significant"
+	 * progress.  --DaveM
+	 */
+	if (sock_writeable(sk)) {
+		struct socket_wq *wq = rcu_dereference(sk->sk_wq);
+
+		/* rely on refcount_sub from sock_wfree() */
+		smp_mb__after_atomic();
+		if (wq && waitqueue_active(&wq->wait))
+			wake_up_interruptible_sync_poll(&wq->wait, EPOLLOUT |
+						EPOLLWRNORM | EPOLLWRBAND);
+
+		/* Should agree with poll, otherwise some programs break */
+		sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
+	}
+}
+
+static void sock_def_destruct(struct sock *sk)
+{
+}
+
+void sk_send_sigurg(struct sock *sk)
+{
+	if (sk->sk_socket && sk->sk_socket->file)
+		if (send_sigurg(&sk->sk_socket->file->f_owner))
+			sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
+}
+EXPORT_SYMBOL(sk_send_sigurg);
+
+void sk_reset_timer(struct sock *sk, struct timer_list* timer,
+		    unsigned long expires)
+{
+	if (!mod_timer(timer, expires))
+		sock_hold(sk);
+}
+EXPORT_SYMBOL(sk_reset_timer);
+
+void sk_stop_timer(struct sock *sk, struct timer_list* timer)
+{
+	if (del_timer(timer))
+		__sock_put(sk);
+}
+EXPORT_SYMBOL(sk_stop_timer);
+
+void sk_stop_timer_sync(struct sock *sk, struct timer_list *timer)
+{
+	if (del_timer_sync(timer))
+		__sock_put(sk);
+}
+EXPORT_SYMBOL(sk_stop_timer_sync);
+
+void sock_init_data_uid(struct socket *sock, struct sock *sk, kuid_t uid)
+{
+	sk_init_common(sk);
+	sk->sk_send_head	=	NULL;
+
+	timer_setup(&sk->sk_timer, NULL, 0);
+
+	sk->sk_allocation	=	GFP_KERNEL;
+	sk->sk_rcvbuf		=	READ_ONCE(sysctl_rmem_default);
+	sk->sk_sndbuf		=	READ_ONCE(sysctl_wmem_default);
+	sk->sk_state		=	TCP_CLOSE;
+	sk_set_socket(sk, sock);
+
+	sock_set_flag(sk, SOCK_ZAPPED);
+
+	if (sock) {
+		sk->sk_type	=	sock->type;
+		RCU_INIT_POINTER(sk->sk_wq, &sock->wq);
+		sock->sk	=	sk;
+	} else {
+		RCU_INIT_POINTER(sk->sk_wq, NULL);
+	}
+	sk->sk_uid	=	uid;
+
+	rwlock_init(&sk->sk_callback_lock);
+	if (sk->sk_kern_sock)
+		lockdep_set_class_and_name(
+			&sk->sk_callback_lock,
+			af_kern_callback_keys + sk->sk_family,
+			af_family_kern_clock_key_strings[sk->sk_family]);
+	else
+		lockdep_set_class_and_name(
+			&sk->sk_callback_lock,
+			af_callback_keys + sk->sk_family,
+			af_family_clock_key_strings[sk->sk_family]);
+
+	sk->sk_state_change	=	sock_def_wakeup;
+	sk->sk_data_ready	=	sock_def_readable;
+	sk->sk_write_space	=	sock_def_write_space;
+	sk->sk_error_report	=	sock_def_error_report;
+	sk->sk_destruct		=	sock_def_destruct;
+
+	sk->sk_frag.page	=	NULL;
+	sk->sk_frag.offset	=	0;
+	sk->sk_peek_off		=	-1;
+
+	sk->sk_peer_pid 	=	NULL;
+	sk->sk_peer_cred	=	NULL;
+	spin_lock_init(&sk->sk_peer_lock);
+
+	sk->sk_write_pending	=	0;
+	sk->sk_rcvlowat		=	1;
+	sk->sk_rcvtimeo		=	MAX_SCHEDULE_TIMEOUT;
+	sk->sk_sndtimeo		=	MAX_SCHEDULE_TIMEOUT;
+
+	sk->sk_stamp = SK_DEFAULT_STAMP;
+#if BITS_PER_LONG==32
+	seqlock_init(&sk->sk_stamp_seq);
+#endif
+	atomic_set(&sk->sk_zckey, 0);
+
+#ifdef CONFIG_NET_RX_BUSY_POLL
+	sk->sk_napi_id		=	0;
+	sk->sk_ll_usec		=	READ_ONCE(sysctl_net_busy_read);
+#endif
+
+	sk->sk_max_pacing_rate = ~0UL;
+	sk->sk_pacing_rate = ~0UL;
+	WRITE_ONCE(sk->sk_pacing_shift, 10);
+	sk->sk_incoming_cpu = -1;
+
+	sk_rx_queue_clear(sk);
+	/*
+	 * Before updating sk_refcnt, we must commit prior changes to memory
+	 * (Documentation/RCU/rculist_nulls.rst for details)
+	 */
+	smp_wmb();
+	refcount_set(&sk->sk_refcnt, 1);
+	atomic_set(&sk->sk_drops, 0);
+}
+EXPORT_SYMBOL(sock_init_data_uid);
+
+void sock_init_data(struct socket *sock, struct sock *sk)
+{
+	kuid_t uid = sock ?
+		SOCK_INODE(sock)->i_uid :
+		make_kuid(sock_net(sk)->user_ns, 0);
+
+	sock_init_data_uid(sock, sk, uid);
+}
+EXPORT_SYMBOL(sock_init_data);
+
+void lock_sock_nested(struct sock *sk, int subclass)
+{
+	/* The sk_lock has mutex_lock() semantics here. */
+	mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
+
+	might_sleep();
+	spin_lock_bh(&sk->sk_lock.slock);
+	if (sock_owned_by_user_nocheck(sk))
+		__lock_sock(sk);
+	sk->sk_lock.owned = 1;
+	spin_unlock_bh(&sk->sk_lock.slock);
+}
+EXPORT_SYMBOL(lock_sock_nested);
+
+void release_sock(struct sock *sk)
+{
+	spin_lock_bh(&sk->sk_lock.slock);
+	if (sk->sk_backlog.tail)
+		__release_sock(sk);
+
+	/* Warning : release_cb() might need to release sk ownership,
+	 * ie call sock_release_ownership(sk) before us.
+	 */
+	if (sk->sk_prot->release_cb)
+		sk->sk_prot->release_cb(sk);
+
+	sock_release_ownership(sk);
+	if (waitqueue_active(&sk->sk_lock.wq))
+		wake_up(&sk->sk_lock.wq);
+	spin_unlock_bh(&sk->sk_lock.slock);
+}
+EXPORT_SYMBOL(release_sock);
+
+bool __lock_sock_fast(struct sock *sk) __acquires(&sk->sk_lock.slock)
+{
+	might_sleep();
+	spin_lock_bh(&sk->sk_lock.slock);
+
+	if (!sock_owned_by_user_nocheck(sk)) {
+		/*
+		 * Fast path return with bottom halves disabled and
+		 * sock::sk_lock.slock held.
+		 *
+		 * The 'mutex' is not contended and holding
+		 * sock::sk_lock.slock prevents all other lockers to
+		 * proceed so the corresponding unlock_sock_fast() can
+		 * avoid the slow path of release_sock() completely and
+		 * just release slock.
+		 *
+		 * From a semantical POV this is equivalent to 'acquiring'
+		 * the 'mutex', hence the corresponding lockdep
+		 * mutex_release() has to happen in the fast path of
+		 * unlock_sock_fast().
+		 */
+		return false;
+	}
+
+	__lock_sock(sk);
+	sk->sk_lock.owned = 1;
+	__acquire(&sk->sk_lock.slock);
+	spin_unlock_bh(&sk->sk_lock.slock);
+	return true;
+}
+EXPORT_SYMBOL(__lock_sock_fast);
+
+int sock_gettstamp(struct socket *sock, void __user *userstamp,
+		   bool timeval, bool time32)
+{
+	struct sock *sk = sock->sk;
+	struct timespec64 ts;
+
+	sock_enable_timestamp(sk, SOCK_TIMESTAMP);
+	ts = ktime_to_timespec64(sock_read_timestamp(sk));
+	if (ts.tv_sec == -1)
+		return -ENOENT;
+	if (ts.tv_sec == 0) {
+		ktime_t kt = ktime_get_real();
+		sock_write_timestamp(sk, kt);
+		ts = ktime_to_timespec64(kt);
+	}
+
+	if (timeval)
+		ts.tv_nsec /= 1000;
+
+#ifdef CONFIG_COMPAT_32BIT_TIME
+	if (time32)
+		return put_old_timespec32(&ts, userstamp);
+#endif
+#ifdef CONFIG_SPARC64
+	/* beware of padding in sparc64 timeval */
+	if (timeval && !in_compat_syscall()) {
+		struct __kernel_old_timeval __user tv = {
+			.tv_sec = ts.tv_sec,
+			.tv_usec = ts.tv_nsec,
+		};
+		if (copy_to_user(userstamp, &tv, sizeof(tv)))
+			return -EFAULT;
+		return 0;
+	}
+#endif
+	return put_timespec64(&ts, userstamp);
+}
+EXPORT_SYMBOL(sock_gettstamp);
+
+void sock_enable_timestamp(struct sock *sk, enum sock_flags flag)
+{
+	if (!sock_flag(sk, flag)) {
+		unsigned long previous_flags = sk->sk_flags;
+
+		sock_set_flag(sk, flag);
+		/*
+		 * we just set one of the two flags which require net
+		 * time stamping, but time stamping might have been on
+		 * already because of the other one
+		 */
+		if (sock_needs_netstamp(sk) &&
+		    !(previous_flags & SK_FLAGS_TIMESTAMP))
+			net_enable_timestamp();
+	}
+}
+
+int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len,
+		       int level, int type)
+{
+	struct sock_exterr_skb *serr;
+	struct sk_buff *skb;
+	int copied, err;
+
+	err = -EAGAIN;
+	skb = sock_dequeue_err_skb(sk);
+	if (skb == NULL)
+		goto out;
+
+	copied = skb->len;
+	if (copied > len) {
+		msg->msg_flags |= MSG_TRUNC;
+		copied = len;
+	}
+	err = skb_copy_datagram_msg(skb, 0, msg, copied);
+	if (err)
+		goto out_free_skb;
+
+	sock_recv_timestamp(msg, sk, skb);
+
+	serr = SKB_EXT_ERR(skb);
+	put_cmsg(msg, level, type, sizeof(serr->ee), &serr->ee);
+
+	msg->msg_flags |= MSG_ERRQUEUE;
+	err = copied;
+
+out_free_skb:
+	kfree_skb(skb);
+out:
+	return err;
+}
+EXPORT_SYMBOL(sock_recv_errqueue);
+
+/*
+ *	Get a socket option on an socket.
+ *
+ *	FIX: POSIX 1003.1g is very ambiguous here. It states that
+ *	asynchronous errors should be reported by getsockopt. We assume
+ *	this means if you specify SO_ERROR (otherwise whats the point of it).
+ */
+int sock_common_getsockopt(struct socket *sock, int level, int optname,
+			   char __user *optval, int __user *optlen)
+{
+	struct sock *sk = sock->sk;
+
+	/* IPV6_ADDRFORM can change sk->sk_prot under us. */
+	return READ_ONCE(sk->sk_prot)->getsockopt(sk, level, optname, optval, optlen);
+}
+EXPORT_SYMBOL(sock_common_getsockopt);
+
+int sock_common_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
+			int flags)
+{
+	struct sock *sk = sock->sk;
+	int addr_len = 0;
+	int err;
+
+	err = sk->sk_prot->recvmsg(sk, msg, size, flags, &addr_len);
+	if (err >= 0)
+		msg->msg_namelen = addr_len;
+	return err;
+}
+EXPORT_SYMBOL(sock_common_recvmsg);
+
+/*
+ *	Set socket options on an inet socket.
+ */
+int sock_common_setsockopt(struct socket *sock, int level, int optname,
+			   sockptr_t optval, unsigned int optlen)
+{
+	struct sock *sk = sock->sk;
+
+	/* IPV6_ADDRFORM can change sk->sk_prot under us. */
+	return READ_ONCE(sk->sk_prot)->setsockopt(sk, level, optname, optval, optlen);
+}
+EXPORT_SYMBOL(sock_common_setsockopt);
+
+void sk_common_release(struct sock *sk)
+{
+	if (sk->sk_prot->destroy)
+		sk->sk_prot->destroy(sk);
+
+	/*
+	 * Observation: when sk_common_release is called, processes have
+	 * no access to socket. But net still has.
+	 * Step one, detach it from networking:
+	 *
+	 * A. Remove from hash tables.
+	 */
+
+	sk->sk_prot->unhash(sk);
+
+	/*
+	 * In this point socket cannot receive new packets, but it is possible
+	 * that some packets are in flight because some CPU runs receiver and
+	 * did hash table lookup before we unhashed socket. They will achieve
+	 * receive queue and will be purged by socket destructor.
+	 *
+	 * Also we still have packets pending on receive queue and probably,
+	 * our own packets waiting in device queues. sock_destroy will drain
+	 * receive queue, but transmitted packets will delay socket destruction
+	 * until the last reference will be released.
+	 */
+
+	sock_orphan(sk);
+
+	xfrm_sk_free_policy(sk);
+
+	sk_refcnt_debug_release(sk);
+
+	sock_put(sk);
+}
+EXPORT_SYMBOL(sk_common_release);
+
+void sk_get_meminfo(const struct sock *sk, u32 *mem)
+{
+	memset(mem, 0, sizeof(*mem) * SK_MEMINFO_VARS);
+
+	mem[SK_MEMINFO_RMEM_ALLOC] = sk_rmem_alloc_get(sk);
+	mem[SK_MEMINFO_RCVBUF] = READ_ONCE(sk->sk_rcvbuf);
+	mem[SK_MEMINFO_WMEM_ALLOC] = sk_wmem_alloc_get(sk);
+	mem[SK_MEMINFO_SNDBUF] = READ_ONCE(sk->sk_sndbuf);
+	mem[SK_MEMINFO_FWD_ALLOC] = sk_forward_alloc_get(sk);
+	mem[SK_MEMINFO_WMEM_QUEUED] = READ_ONCE(sk->sk_wmem_queued);
+	mem[SK_MEMINFO_OPTMEM] = atomic_read(&sk->sk_omem_alloc);
+	mem[SK_MEMINFO_BACKLOG] = READ_ONCE(sk->sk_backlog.len);
+	mem[SK_MEMINFO_DROPS] = atomic_read(&sk->sk_drops);
+}
+
+#ifdef CONFIG_PROC_FS
+static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
+
+int sock_prot_inuse_get(struct net *net, struct proto *prot)
+{
+	int cpu, idx = prot->inuse_idx;
+	int res = 0;
+
+	for_each_possible_cpu(cpu)
+		res += per_cpu_ptr(net->core.prot_inuse, cpu)->val[idx];
+
+	return res >= 0 ? res : 0;
+}
+EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
+
+int sock_inuse_get(struct net *net)
+{
+	int cpu, res = 0;
+
+	for_each_possible_cpu(cpu)
+		res += per_cpu_ptr(net->core.prot_inuse, cpu)->all;
+
+	return res;
+}
+
+EXPORT_SYMBOL_GPL(sock_inuse_get);
+
+static int __net_init sock_inuse_init_net(struct net *net)
+{
+	net->core.prot_inuse = alloc_percpu(struct prot_inuse);
+	if (net->core.prot_inuse == NULL)
+		return -ENOMEM;
+	return 0;
+}
+
+static void __net_exit sock_inuse_exit_net(struct net *net)
+{
+	free_percpu(net->core.prot_inuse);
+}
+
+static struct pernet_operations net_inuse_ops = {
+	.init = sock_inuse_init_net,
+	.exit = sock_inuse_exit_net,
+};
+
+static __init int net_inuse_init(void)
+{
+	if (register_pernet_subsys(&net_inuse_ops))
+		panic("Cannot initialize net inuse counters");
+
+	return 0;
+}
+
+core_initcall(net_inuse_init);
+
+static int assign_proto_idx(struct proto *prot)
+{
+	prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);
+
+	if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
+		pr_err("PROTO_INUSE_NR exhausted\n");
+		return -ENOSPC;
+	}
+
+	set_bit(prot->inuse_idx, proto_inuse_idx);
+	return 0;
+}
+
+static void release_proto_idx(struct proto *prot)
+{
+	if (prot->inuse_idx != PROTO_INUSE_NR - 1)
+		clear_bit(prot->inuse_idx, proto_inuse_idx);
+}
+#else
+static inline int assign_proto_idx(struct proto *prot)
+{
+	return 0;
+}
+
+static inline void release_proto_idx(struct proto *prot)
+{
+}
+
+#endif
+
+static void tw_prot_cleanup(struct timewait_sock_ops *twsk_prot)
+{
+	if (!twsk_prot)
+		return;
+	kfree(twsk_prot->twsk_slab_name);
+	twsk_prot->twsk_slab_name = NULL;
+	kmem_cache_destroy(twsk_prot->twsk_slab);
+	twsk_prot->twsk_slab = NULL;
+}
+
+static int tw_prot_init(const struct proto *prot)
+{
+	struct timewait_sock_ops *twsk_prot = prot->twsk_prot;
+
+	if (!twsk_prot)
+		return 0;
+
+	twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s",
+					      prot->name);
+	if (!twsk_prot->twsk_slab_name)
+		return -ENOMEM;
+
+	twsk_prot->twsk_slab =
+		kmem_cache_create(twsk_prot->twsk_slab_name,
+				  twsk_prot->twsk_obj_size, 0,
+				  SLAB_ACCOUNT | prot->slab_flags,
+				  NULL);
+	if (!twsk_prot->twsk_slab) {
+		pr_crit("%s: Can't create timewait sock SLAB cache!\n",
+			prot->name);
+		return -ENOMEM;
+	}
+
+	return 0;
+}
+
+static void req_prot_cleanup(struct request_sock_ops *rsk_prot)
+{
+	if (!rsk_prot)
+		return;
+	kfree(rsk_prot->slab_name);
+	rsk_prot->slab_name = NULL;
+	kmem_cache_destroy(rsk_prot->slab);
+	rsk_prot->slab = NULL;
+}
+
+static int req_prot_init(const struct proto *prot)
+{
+	struct request_sock_ops *rsk_prot = prot->rsk_prot;
+
+	if (!rsk_prot)
+		return 0;
+
+	rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s",
+					prot->name);
+	if (!rsk_prot->slab_name)
+		return -ENOMEM;
+
+	rsk_prot->slab = kmem_cache_create(rsk_prot->slab_name,
+					   rsk_prot->obj_size, 0,
+					   SLAB_ACCOUNT | prot->slab_flags,
+					   NULL);
+
+	if (!rsk_prot->slab) {
+		pr_crit("%s: Can't create request sock SLAB cache!\n",
+			prot->name);
+		return -ENOMEM;
+	}
+	return 0;
+}
+
+int proto_register(struct proto *prot, int alloc_slab)
+{
+	int ret = -ENOBUFS;
+
+	if (prot->memory_allocated && !prot->sysctl_mem) {
+		pr_err("%s: missing sysctl_mem\n", prot->name);
+		return -EINVAL;
+	}
+	if (prot->memory_allocated && !prot->per_cpu_fw_alloc) {
+		pr_err("%s: missing per_cpu_fw_alloc\n", prot->name);
+		return -EINVAL;
+	}
+	if (alloc_slab) {
+		prot->slab = kmem_cache_create_usercopy(prot->name,
+					prot->obj_size, 0,
+					SLAB_HWCACHE_ALIGN | SLAB_ACCOUNT |
+					prot->slab_flags,
+					prot->useroffset, prot->usersize,
+					NULL);
+
+		if (prot->slab == NULL) {
+			pr_crit("%s: Can't create sock SLAB cache!\n",
+				prot->name);
+			goto out;
+		}
+
+		if (req_prot_init(prot))
+			goto out_free_request_sock_slab;
+
+		if (tw_prot_init(prot))
+			goto out_free_timewait_sock_slab;
+	}
+
+	mutex_lock(&proto_list_mutex);
+	ret = assign_proto_idx(prot);
+	if (ret) {
+		mutex_unlock(&proto_list_mutex);
+		goto out_free_timewait_sock_slab;
+	}
+	list_add(&prot->node, &proto_list);
+	mutex_unlock(&proto_list_mutex);
+	return ret;
+
+out_free_timewait_sock_slab:
+	if (alloc_slab)
+		tw_prot_cleanup(prot->twsk_prot);
+out_free_request_sock_slab:
+	if (alloc_slab) {
+		req_prot_cleanup(prot->rsk_prot);
+
+		kmem_cache_destroy(prot->slab);
+		prot->slab = NULL;
+	}
+out:
+	return ret;
+}
+EXPORT_SYMBOL(proto_register);
+
+void proto_unregister(struct proto *prot)
+{
+	mutex_lock(&proto_list_mutex);
+	release_proto_idx(prot);
+	list_del(&prot->node);
+	mutex_unlock(&proto_list_mutex);
+
+	kmem_cache_destroy(prot->slab);
+	prot->slab = NULL;
+
+	req_prot_cleanup(prot->rsk_prot);
+	tw_prot_cleanup(prot->twsk_prot);
+}
+EXPORT_SYMBOL(proto_unregister);
+
+int sock_load_diag_module(int family, int protocol)
+{
+	if (!protocol) {
+		if (!sock_is_registered(family))
+			return -ENOENT;
+
+		return request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
+				      NETLINK_SOCK_DIAG, family);
+	}
+
+#ifdef CONFIG_INET
+	if (family == AF_INET &&
+	    protocol != IPPROTO_RAW &&
+	    protocol < MAX_INET_PROTOS &&
+	    !rcu_access_pointer(inet_protos[protocol]))
+		return -ENOENT;
+#endif
+
+	return request_module("net-pf-%d-proto-%d-type-%d-%d", PF_NETLINK,
+			      NETLINK_SOCK_DIAG, family, protocol);
+}
+EXPORT_SYMBOL(sock_load_diag_module);
+
+#ifdef CONFIG_PROC_FS
+static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
+	__acquires(proto_list_mutex)
+{
+	mutex_lock(&proto_list_mutex);
+	return seq_list_start_head(&proto_list, *pos);
+}
+
+static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+	return seq_list_next(v, &proto_list, pos);
+}
+
+static void proto_seq_stop(struct seq_file *seq, void *v)
+	__releases(proto_list_mutex)
+{
+	mutex_unlock(&proto_list_mutex);
+}
+
+static char proto_method_implemented(const void *method)
+{
+	return method == NULL ? 'n' : 'y';
+}
+static long sock_prot_memory_allocated(struct proto *proto)
+{
+	return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L;
+}
+
+static const char *sock_prot_memory_pressure(struct proto *proto)
+{
+	return proto->memory_pressure != NULL ?
+	proto_memory_pressure(proto) ? "yes" : "no" : "NI";
+}
+
+static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
+{
+
+	seq_printf(seq, "%-9s %4u %6d  %6ld   %-3s %6u   %-3s  %-10s "
+			"%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
+		   proto->name,
+		   proto->obj_size,
+		   sock_prot_inuse_get(seq_file_net(seq), proto),
+		   sock_prot_memory_allocated(proto),
+		   sock_prot_memory_pressure(proto),
+		   proto->max_header,
+		   proto->slab == NULL ? "no" : "yes",
+		   module_name(proto->owner),
+		   proto_method_implemented(proto->close),
+		   proto_method_implemented(proto->connect),
+		   proto_method_implemented(proto->disconnect),
+		   proto_method_implemented(proto->accept),
+		   proto_method_implemented(proto->ioctl),
+		   proto_method_implemented(proto->init),
+		   proto_method_implemented(proto->destroy),
+		   proto_method_implemented(proto->shutdown),
+		   proto_method_implemented(proto->setsockopt),
+		   proto_method_implemented(proto->getsockopt),
+		   proto_method_implemented(proto->sendmsg),
+		   proto_method_implemented(proto->recvmsg),
+		   proto_method_implemented(proto->sendpage),
+		   proto_method_implemented(proto->bind),
+		   proto_method_implemented(proto->backlog_rcv),
+		   proto_method_implemented(proto->hash),
+		   proto_method_implemented(proto->unhash),
+		   proto_method_implemented(proto->get_port),
+		   proto_method_implemented(proto->enter_memory_pressure));
+}
+
+static int proto_seq_show(struct seq_file *seq, void *v)
+{
+	if (v == &proto_list)
+		seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
+			   "protocol",
+			   "size",
+			   "sockets",
+			   "memory",
+			   "press",
+			   "maxhdr",
+			   "slab",
+			   "module",
+			   "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
+	else
+		proto_seq_printf(seq, list_entry(v, struct proto, node));
+	return 0;
+}
+
+static const struct seq_operations proto_seq_ops = {
+	.start  = proto_seq_start,
+	.next   = proto_seq_next,
+	.stop   = proto_seq_stop,
+	.show   = proto_seq_show,
+};
+
+static __net_init int proto_init_net(struct net *net)
+{
+	if (!proc_create_net("protocols", 0444, net->proc_net, &proto_seq_ops,
+			sizeof(struct seq_net_private)))
+		return -ENOMEM;
+
+	return 0;
+}
+
+static __net_exit void proto_exit_net(struct net *net)
+{
+	remove_proc_entry("protocols", net->proc_net);
+}
+
+
+static __net_initdata struct pernet_operations proto_net_ops = {
+	.init = proto_init_net,
+	.exit = proto_exit_net,
+};
+
+static int __init proto_init(void)
+{
+	return register_pernet_subsys(&proto_net_ops);
+}
+
+subsys_initcall(proto_init);
+
+#endif /* PROC_FS */
+
+#ifdef CONFIG_NET_RX_BUSY_POLL
+bool sk_busy_loop_end(void *p, unsigned long start_time)
+{
+	struct sock *sk = p;
+
+	if (!skb_queue_empty_lockless(&sk->sk_receive_queue))
+		return true;
+
+	if (sk_is_udp(sk) &&
+	    !skb_queue_empty_lockless(&udp_sk(sk)->reader_queue))
+		return true;
+
+	return sk_busy_loop_timeout(sk, start_time);
+}
+EXPORT_SYMBOL(sk_busy_loop_end);
+#endif /* CONFIG_NET_RX_BUSY_POLL */
+
+int sock_bind_add(struct sock *sk, struct sockaddr *addr, int addr_len)
+{
+	if (!sk->sk_prot->bind_add)
+		return -EOPNOTSUPP;
+	return sk->sk_prot->bind_add(sk, addr, addr_len);
+}
+EXPORT_SYMBOL(sock_bind_add);