238 	struct tun_file *tfile = container_of(napi, struct tun_file, napi);  in tun_napi_receive()  local
239 	struct sk_buff_head *queue = &tfile->sk.sk_write_queue;  in tun_napi_receive()
276 static void tun_napi_init(struct tun_struct *tun, struct tun_file *tfile,  in tun_napi_init()  argument
279 	tfile->napi_enabled = napi_en;  in tun_napi_init()
280 	tfile->napi_frags_enabled = napi_en && napi_frags;  in tun_napi_init()
282 		netif_tx_napi_add(tun->dev, &tfile->napi, tun_napi_poll,  in tun_napi_init()
284 		napi_enable(&tfile->napi);  in tun_napi_init()
288 static void tun_napi_enable(struct tun_file *tfile)  in tun_napi_enable()  argument
290 	if (tfile->napi_enabled)  in tun_napi_enable()
291 		napi_enable(&tfile->napi);  in tun_napi_enable()
294 static void tun_napi_disable(struct tun_file *tfile)  in tun_napi_disable()  argument
296 	if (tfile->napi_enabled)  in tun_napi_disable()
297 		napi_disable(&tfile->napi);  in tun_napi_disable()
300 static void tun_napi_del(struct tun_file *tfile)  in tun_napi_del()  argument
302 	if (tfile->napi_enabled)  in tun_napi_del()
303 		netif_napi_del(&tfile->napi);  in tun_napi_del()
306 static bool tun_napi_frags_enabled(const struct tun_file *tfile)  in tun_napi_frags_enabled()  argument
308 	return tfile->napi_frags_enabled;  in tun_napi_frags_enabled()
486 			    struct tun_file *tfile)  in tun_flow_update()  argument
491 	u16 queue_index = tfile->queue_index;  in tun_flow_update()
605 static void tun_disable_queue(struct tun_struct *tun, struct tun_file *tfile)  in tun_disable_queue()  argument
607 	tfile->detached = tun;  in tun_disable_queue()
608 	list_add_tail(&tfile->next, &tun->disabled);  in tun_disable_queue()
612 static struct tun_struct *tun_enable_queue(struct tun_file *tfile)  in tun_enable_queue()  argument
614 	struct tun_struct *tun = tfile->detached;  in tun_enable_queue()
616 	tfile->detached = NULL;  in tun_enable_queue()
617 	list_del_init(&tfile->next);  in tun_enable_queue()
636 static void tun_queue_purge(struct tun_file *tfile)  in tun_queue_purge()  argument
640 	while ((ptr = ptr_ring_consume(&tfile->tx_ring)) != NULL)  in tun_queue_purge()
643 	skb_queue_purge(&tfile->sk.sk_write_queue);  in tun_queue_purge()
644 	skb_queue_purge(&tfile->sk.sk_error_queue);  in tun_queue_purge()
647 static void __tun_detach(struct tun_file *tfile, bool clean)  in __tun_detach()  argument
652 	tun = rtnl_dereference(tfile->tun);  in __tun_detach()
655 		if (!tfile->detached)  in __tun_detach()
656 			tun_napi_disable(tfile);  in __tun_detach()
657 		tun_napi_del(tfile);  in __tun_detach()
660 	if (tun && !tfile->detached) {  in __tun_detach()
661 		u16 index = tfile->queue_index;  in __tun_detach()
673 			RCU_INIT_POINTER(tfile->tun, NULL);  in __tun_detach()
674 			sock_put(&tfile->sk);  in __tun_detach()
676 			tun_disable_queue(tun, tfile);  in __tun_detach()
677 			tun_napi_disable(tfile);  in __tun_detach()
683 		tun_queue_purge(tfile);  in __tun_detach()
685 	} else if (tfile->detached && clean) {  in __tun_detach()
686 		tun = tun_enable_queue(tfile);  in __tun_detach()
687 		sock_put(&tfile->sk);  in __tun_detach()
699 			xdp_rxq_info_unreg(&tfile->xdp_rxq);  in __tun_detach()
700 		ptr_ring_cleanup(&tfile->tx_ring, tun_ptr_free);  in __tun_detach()
704 static void tun_detach(struct tun_file *tfile, bool clean)  in tun_detach()  argument
710 	tun = rtnl_dereference(tfile->tun);  in tun_detach()
712 	__tun_detach(tfile, clean);  in tun_detach()
718 		sock_put(&tfile->sk);  in tun_detach()
724 	struct tun_file *tfile, *tmp;  in tun_detach_all()  local
728 		tfile = rtnl_dereference(tun->tfiles[i]);  in tun_detach_all()
729 		BUG_ON(!tfile);  in tun_detach_all()
730 		tun_napi_disable(tfile);  in tun_detach_all()
731 		tfile->socket.sk->sk_shutdown = RCV_SHUTDOWN;  in tun_detach_all()
732 		tfile->socket.sk->sk_data_ready(tfile->socket.sk);  in tun_detach_all()
733 		RCU_INIT_POINTER(tfile->tun, NULL);  in tun_detach_all()
736 	list_for_each_entry(tfile, &tun->disabled, next) {  in tun_detach_all()
737 		tfile->socket.sk->sk_shutdown = RCV_SHUTDOWN;  in tun_detach_all()
738 		tfile->socket.sk->sk_data_ready(tfile->socket.sk);  in tun_detach_all()
739 		RCU_INIT_POINTER(tfile->tun, NULL);  in tun_detach_all()
745 		tfile = rtnl_dereference(tun->tfiles[i]);  in tun_detach_all()
746 		tun_napi_del(tfile);  in tun_detach_all()
748 		tun_queue_purge(tfile);  in tun_detach_all()
749 		xdp_rxq_info_unreg(&tfile->xdp_rxq);  in tun_detach_all()
750 		sock_put(&tfile->sk);  in tun_detach_all()
752 	list_for_each_entry_safe(tfile, tmp, &tun->disabled, next) {  in tun_detach_all()
753 		tun_napi_del(tfile);  in tun_detach_all()
754 		tun_enable_queue(tfile);  in tun_detach_all()
755 		tun_queue_purge(tfile);  in tun_detach_all()
756 		xdp_rxq_info_unreg(&tfile->xdp_rxq);  in tun_detach_all()
757 		sock_put(&tfile->sk);  in tun_detach_all()
769 	struct tun_file *tfile = file->private_data;  in tun_attach()  local
773 	err = security_tun_dev_attach(tfile->socket.sk, tun->security);  in tun_attach()
778 	if (rtnl_dereference(tfile->tun) && !tfile->detached)  in tun_attach()
786 	if (!tfile->detached &&  in tun_attach()
794 		lock_sock(tfile->socket.sk);  in tun_attach()
795 		err = sk_attach_filter(&tun->fprog, tfile->socket.sk);  in tun_attach()
796 		release_sock(tfile->socket.sk);  in tun_attach()
801 	if (!tfile->detached &&  in tun_attach()
802 	    ptr_ring_resize(&tfile->tx_ring, dev->tx_queue_len,  in tun_attach()
808 	tfile->queue_index = tun->numqueues;  in tun_attach()
809 	tfile->socket.sk->sk_shutdown &= ~RCV_SHUTDOWN;  in tun_attach()
811 	if (tfile->detached) {  in tun_attach()
813 		WARN_ON(!xdp_rxq_info_is_reg(&tfile->xdp_rxq));  in tun_attach()
815 		if (tfile->xdp_rxq.queue_index    != tfile->queue_index)  in tun_attach()
816 			tfile->xdp_rxq.queue_index = tfile->queue_index;  in tun_attach()
819 		err = xdp_rxq_info_reg(&tfile->xdp_rxq,  in tun_attach()
820 				       tun->dev, tfile->queue_index);  in tun_attach()
823 		err = xdp_rxq_info_reg_mem_model(&tfile->xdp_rxq,  in tun_attach()
826 			xdp_rxq_info_unreg(&tfile->xdp_rxq);  in tun_attach()
832 	if (tfile->detached) {  in tun_attach()
833 		tun_enable_queue(tfile);  in tun_attach()
834 		tun_napi_enable(tfile);  in tun_attach()
836 		sock_hold(&tfile->sk);  in tun_attach()
837 		tun_napi_init(tun, tfile, napi, napi_frags);  in tun_attach()
841 		sock_set_flag(&tfile->sk, SOCK_XDP);  in tun_attach()
852 		rcu_assign_pointer(tfile->tun, tun);  in tun_attach()
853 	rcu_assign_pointer(tun->tfiles[tun->numqueues], tfile);  in tun_attach()
860 static struct tun_struct *tun_get(struct tun_file *tfile)  in tun_get()  argument
865 	tun = rcu_dereference(tfile->tun);  in tun_get()
1087 	struct tun_file *tfile;  in tun_net_xmit()  local
1091 	tfile = rcu_dereference(tun->tfiles[txq]);  in tun_net_xmit()
1094 	if (!tfile)  in tun_net_xmit()
1108 	if (tfile->socket.sk->sk_filter &&  in tun_net_xmit()
1109 	    sk_filter(tfile->socket.sk, skb))  in tun_net_xmit()
1128 	if (ptr_ring_produce(&tfile->tx_ring, skb))  in tun_net_xmit()
1136 	if (tfile->flags & TUN_FASYNC)  in tun_net_xmit()
1137 		kill_fasync(&tfile->fasync, SIGIO, POLL_IN);  in tun_net_xmit()
1138 	tfile->socket.sk->sk_data_ready(tfile->socket.sk);  in tun_net_xmit()
1218 	struct tun_file *tfile;  in tun_xdp_set()  local
1228 		tfile = rtnl_dereference(tun->tfiles[i]);  in tun_xdp_set()
1230 			sock_set_flag(&tfile->sk, SOCK_XDP);  in tun_xdp_set()
1232 			sock_reset_flag(&tfile->sk, SOCK_XDP);  in tun_xdp_set()
1234 	list_for_each_entry(tfile, &tun->disabled, next) {  in tun_xdp_set()
1236 			sock_set_flag(&tfile->sk, SOCK_XDP);  in tun_xdp_set()
1238 			sock_reset_flag(&tfile->sk, SOCK_XDP);  in tun_xdp_set()
1282 static void __tun_xdp_flush_tfile(struct tun_file *tfile)  in __tun_xdp_flush_tfile()  argument
1285 	if (tfile->flags & TUN_FASYNC)  in __tun_xdp_flush_tfile()
1286 		kill_fasync(&tfile->fasync, SIGIO, POLL_IN);  in __tun_xdp_flush_tfile()
1287 	tfile->socket.sk->sk_data_ready(tfile->socket.sk);  in __tun_xdp_flush_tfile()
1294 	struct tun_file *tfile;  in tun_xdp_xmit()  local
1312 	tfile = rcu_dereference(tun->tfiles[smp_processor_id() %  in tun_xdp_xmit()
1314 	if (unlikely(!tfile))  in tun_xdp_xmit()
1317 	spin_lock(&tfile->tx_ring.producer_lock);  in tun_xdp_xmit()
1325 		if (__ptr_ring_produce(&tfile->tx_ring, frame)) {  in tun_xdp_xmit()
1331 	spin_unlock(&tfile->tx_ring.producer_lock);  in tun_xdp_xmit()
1334 		__tun_xdp_flush_tfile(tfile);  in tun_xdp_xmit()
1427 static bool tun_sock_writeable(struct tun_struct *tun, struct tun_file *tfile)  in tun_sock_writeable()  argument
1429 	struct sock *sk = tfile->socket.sk;  in tun_sock_writeable()
1439 	struct tun_file *tfile = file->private_data;  in tun_chr_poll()  local
1440 	struct tun_struct *tun = tun_get(tfile);  in tun_chr_poll()
1447 	sk = tfile->socket.sk;  in tun_chr_poll()
1451 	if (!ptr_ring_empty(&tfile->tx_ring))  in tun_chr_poll()
1459 	if (tun_sock_writeable(tun, tfile) ||  in tun_chr_poll()
1461 	     tun_sock_writeable(tun, tfile)))  in tun_chr_poll()
1471 static struct sk_buff *tun_napi_alloc_frags(struct tun_file *tfile,  in tun_napi_alloc_frags()  argument
1485 	skb = napi_get_frags(&tfile->napi);  in tun_napi_alloc_frags()
1521 	napi_free_frags(&tfile->napi);  in tun_napi_alloc_frags()
1527 static struct sk_buff *tun_alloc_skb(struct tun_file *tfile,  in tun_alloc_skb()  argument
1531 	struct sock *sk = tfile->socket.sk;  in tun_alloc_skb()
1552 static void tun_rx_batched(struct tun_struct *tun, struct tun_file *tfile,  in tun_rx_batched()  argument
1555 	struct sk_buff_head *queue = &tfile->sk.sk_write_queue;  in tun_rx_batched()
1562 		skb_record_rx_queue(skb, tfile->queue_index);  in tun_rx_batched()
1583 			skb_record_rx_queue(nskb, tfile->queue_index);  in tun_rx_batched()
1586 		skb_record_rx_queue(skb, tfile->queue_index);  in tun_rx_batched()
1592 static bool tun_can_build_skb(struct tun_struct *tun, struct tun_file *tfile,  in tun_can_build_skb()  argument
1598 	if (tfile->socket.sk->sk_sndbuf != INT_MAX)  in tun_can_build_skb()
1614 static struct sk_buff *__tun_build_skb(struct tun_file *tfile,  in __tun_build_skb()  argument
1625 	skb_set_owner_w(skb, tfile->socket.sk);  in __tun_build_skb()
1666 				     struct tun_file *tfile,  in tun_build_skb()  argument
1703 		return __tun_build_skb(tfile, alloc_frag, buf, buflen, len,  in tun_build_skb()
1720 		xdp.rxq = &tfile->xdp_rxq;  in tun_build_skb()
1746 	return __tun_build_skb(tfile, alloc_frag, buf, buflen, len, pad);  in tun_build_skb()
1755 static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile,  in tun_get_user()  argument
1771 	bool frags = tun_napi_frags_enabled(tfile);  in tun_get_user()
1826 	if (!frags && tun_can_build_skb(tun, tfile, len, noblock, zerocopy)) {  in tun_get_user()
1831 		skb = tun_build_skb(tun, tfile, from, &gso, len, &skb_xdp);  in tun_get_user()
1848 			mutex_lock(&tfile->napi_mutex);  in tun_get_user()
1849 			skb = tun_napi_alloc_frags(tfile, copylen, from);  in tun_get_user()
1856 			skb = tun_alloc_skb(tfile, align, copylen, linear,  in tun_get_user()
1864 				mutex_unlock(&tfile->napi_mutex);  in tun_get_user()
1879 				tfile->napi.skb = NULL;  in tun_get_user()
1880 				mutex_unlock(&tfile->napi_mutex);  in tun_get_user()
1891 			tfile->napi.skb = NULL;  in tun_get_user()
1892 			mutex_unlock(&tfile->napi_mutex);  in tun_get_user()
1942 	skb_record_rx_queue(skb, tfile->queue_index);  in tun_get_user()
1957 					tfile->napi.skb = NULL;  in tun_get_user()
1958 					mutex_unlock(&tfile->napi_mutex);  in tun_get_user()
1972 	    !tfile->detached)  in tun_get_user()
1995 			napi_free_frags(&tfile->napi);  in tun_get_user()
1997 			mutex_unlock(&tfile->napi_mutex);  in tun_get_user()
2001 		if (likely(napi_schedule_prep(&tfile->napi))) {  in tun_get_user()
2003 			napi_gro_frags(&tfile->napi);  in tun_get_user()
2004 			napi_complete(&tfile->napi);  in tun_get_user()
2010 		mutex_unlock(&tfile->napi_mutex);  in tun_get_user()
2011 	} else if (tfile->napi_enabled) {  in tun_get_user()
2012 		struct sk_buff_head *queue = &tfile->sk.sk_write_queue;  in tun_get_user()
2021 			napi_schedule(&tfile->napi);  in tun_get_user()
2025 		tun_rx_batched(tun, tfile, skb, more);  in tun_get_user()
2039 		tun_flow_update(tun, rxhash, tfile);  in tun_get_user()
2047 	struct tun_file *tfile = file->private_data;  in tun_chr_write_iter()  local
2048 	struct tun_struct *tun = tun_get(tfile);  in tun_chr_write_iter()
2058 	result = tun_get_user(tun, tfile, NULL, from, noblock, false);  in tun_chr_write_iter()
2065 				struct tun_file *tfile,  in tun_put_user_xdp()  argument
2100 			    struct tun_file *tfile,  in tun_put_user()  argument
2193 static void *tun_ring_recv(struct tun_file *tfile, int noblock, int *err)  in tun_ring_recv()  argument
2199 	ptr = ptr_ring_consume(&tfile->tx_ring);  in tun_ring_recv()
2207 	add_wait_queue(&tfile->socket.wq.wait, &wait);  in tun_ring_recv()
2211 		ptr = ptr_ring_consume(&tfile->tx_ring);  in tun_ring_recv()
2218 		if (tfile->socket.sk->sk_shutdown & RCV_SHUTDOWN) {  in tun_ring_recv()
2227 	remove_wait_queue(&tfile->socket.wq.wait, &wait);  in tun_ring_recv()
2234 static ssize_t tun_do_read(struct tun_struct *tun, struct tun_file *tfile,  in tun_do_read()  argument
2248 		ptr = tun_ring_recv(tfile, noblock, &err);  in tun_do_read()
2256 		ret = tun_put_user_xdp(tun, tfile, xdpf, to);  in tun_do_read()
2261 		ret = tun_put_user(tun, tfile, skb, to);  in tun_do_read()
2274 	struct tun_file *tfile = file->private_data;  in tun_chr_read_iter()  local
2275 	struct tun_struct *tun = tun_get(tfile);  in tun_chr_read_iter()
2285 	ret = tun_do_read(tun, tfile, to, noblock, NULL);  in tun_chr_read_iter()
2431 	struct tun_file *tfile;  in tun_sock_write_space()  local
2445 	tfile = container_of(sk, struct tun_file, sk);  in tun_sock_write_space()
2446 	kill_fasync(&tfile->fasync, SIGIO, POLL_OUT);  in tun_sock_write_space()
2456 		       struct tun_file *tfile,  in tun_xdp_one()  argument
2479 		xdp->rxq = &tfile->xdp_rxq;  in tun_xdp_one()
2530 	skb_record_rx_queue(skb, tfile->queue_index);  in tun_xdp_one()
2539 	    !tfile->detached)  in tun_xdp_one()
2554 		tun_flow_update(tun, rxhash, tfile);  in tun_xdp_one()
2563 	struct tun_file *tfile = container_of(sock, struct tun_file, socket);  in tun_sendmsg()  local
2564 	struct tun_struct *tun = tun_get(tfile);  in tun_sendmsg()
2584 			tun_xdp_one(tun, tfile, xdp, &flush, &tpage);  in tun_sendmsg()
2599 	ret = tun_get_user(tun, tfile, ctl ? ctl->ptr : NULL, &m->msg_iter,  in tun_sendmsg()
2610 	struct tun_file *tfile = container_of(sock, struct tun_file, socket);  in tun_recvmsg()  local
2611 	struct tun_struct *tun = tun_get(tfile);  in tun_recvmsg()
2629 	ret = tun_do_read(tun, tfile, &m->msg_iter, flags & MSG_DONTWAIT, ptr);  in tun_recvmsg()
2661 	struct tun_file *tfile = container_of(sock, struct tun_file, socket);  in tun_peek_len()  local
2665 	tun = tun_get(tfile);  in tun_peek_len()
2669 	ret = PTR_RING_PEEK_CALL(&tfile->tx_ring, tun_ptr_peek_len);  in tun_peek_len()
2738 	struct tun_file *tfile = file->private_data;  in tun_set_iff()  local
2742 	if (tfile->detached)  in tun_set_iff()
2830 		dev->ifindex = tfile->ifindex;  in tun_set_iff()
2841 		tun->sndbuf = tfile->socket.sk->sk_sndbuf;  in tun_set_iff()
2858 		rcu_assign_pointer(tfile->tun, tun);  in tun_set_iff()
2922 	struct tun_file *tfile;  in tun_detach_filter()  local
2925 		tfile = rtnl_dereference(tun->tfiles[i]);  in tun_detach_filter()
2926 		lock_sock(tfile->socket.sk);  in tun_detach_filter()
2927 		sk_detach_filter(tfile->socket.sk);  in tun_detach_filter()
2928 		release_sock(tfile->socket.sk);  in tun_detach_filter()
2937 	struct tun_file *tfile;  in tun_attach_filter()  local
2940 		tfile = rtnl_dereference(tun->tfiles[i]);  in tun_attach_filter()
2941 		lock_sock(tfile->socket.sk);  in tun_attach_filter()
2942 		ret = sk_attach_filter(&tun->fprog, tfile->socket.sk);  in tun_attach_filter()
2943 		release_sock(tfile->socket.sk);  in tun_attach_filter()
2956 	struct tun_file *tfile;  in tun_set_sndbuf()  local
2960 		tfile = rtnl_dereference(tun->tfiles[i]);  in tun_set_sndbuf()
2961 		tfile->socket.sk->sk_sndbuf = tun->sndbuf;  in tun_set_sndbuf()
2967 	struct tun_file *tfile = file->private_data;  in tun_set_queue()  local
2974 		tun = tfile->detached;  in tun_set_queue()
2985 		tun = rtnl_dereference(tfile->tun);  in tun_set_queue()
2986 		if (!tun || !(tun->flags & IFF_MULTI_QUEUE) || tfile->detached)  in tun_set_queue()
2989 			__tun_detach(tfile, false);  in tun_set_queue()
3063 	struct tun_file *tfile = file->private_data;  in __tun_chr_ioctl()  local
3064 	struct net *net = sock_net(&tfile->sk);  in __tun_chr_ioctl()
3102 	tun = tun_get(tfile);  in __tun_chr_ioctl()
3129 		tfile->ifindex = ifindex;  in __tun_chr_ioctl()
3145 		if (tfile->detached)  in __tun_chr_ioctl()
3147 		if (!tfile->socket.sk->sk_filter)  in __tun_chr_ioctl()
3251 		sndbuf = tfile->socket.sk->sk_sndbuf;  in __tun_chr_ioctl()
3420 	struct tun_file *tfile = file->private_data;  in tun_chr_fasync()  local
3423 	if ((ret = fasync_helper(fd, file, on, &tfile->fasync)) < 0)  in tun_chr_fasync()
3428 		tfile->flags |= TUN_FASYNC;  in tun_chr_fasync()
3430 		tfile->flags &= ~TUN_FASYNC;  in tun_chr_fasync()
3439 	struct tun_file *tfile;  in tun_chr_open()  local
3441 	tfile = (struct tun_file *)sk_alloc(net, AF_UNSPEC, GFP_KERNEL,  in tun_chr_open()
3443 	if (!tfile)  in tun_chr_open()
3445 	if (ptr_ring_init(&tfile->tx_ring, 0, GFP_KERNEL)) {  in tun_chr_open()
3446 		sk_free(&tfile->sk);  in tun_chr_open()
3450 	mutex_init(&tfile->napi_mutex);  in tun_chr_open()
3451 	RCU_INIT_POINTER(tfile->tun, NULL);  in tun_chr_open()
3452 	tfile->flags = 0;  in tun_chr_open()
3453 	tfile->ifindex = 0;  in tun_chr_open()
3455 	init_waitqueue_head(&tfile->socket.wq.wait);  in tun_chr_open()
3457 	tfile->socket.file = file;  in tun_chr_open()
3458 	tfile->socket.ops = &tun_socket_ops;  in tun_chr_open()
3460 	sock_init_data(&tfile->socket, &tfile->sk);  in tun_chr_open()
3462 	tfile->sk.sk_write_space = tun_sock_write_space;  in tun_chr_open()
3463 	tfile->sk.sk_sndbuf = INT_MAX;  in tun_chr_open()
3465 	file->private_data = tfile;  in tun_chr_open()
3466 	INIT_LIST_HEAD(&tfile->next);  in tun_chr_open()
3468 	sock_set_flag(&tfile->sk, SOCK_ZEROCOPY);  in tun_chr_open()
3475 	struct tun_file *tfile = file->private_data;  in tun_chr_close()  local
3477 	tun_detach(tfile, true);  in tun_chr_close()
3485 	struct tun_file *tfile = file->private_data;  in tun_chr_show_fdinfo()  local
3492 	tun = tun_get(tfile);  in tun_chr_show_fdinfo()
3631 	struct tun_file *tfile;  in tun_queue_resize()  local
3641 		tfile = rtnl_dereference(tun->tfiles[i]);  in tun_queue_resize()
3642 		rings[i] = &tfile->tx_ring;  in tun_queue_resize()
3644 	list_for_each_entry(tfile, &tun->disabled, next)  in tun_queue_resize()
3645 		rings[i++] = &tfile->tx_ring;  in tun_queue_resize()
3672 			struct tun_file *tfile;  in tun_device_event()  local
3674 			tfile = rtnl_dereference(tun->tfiles[i]);  in tun_device_event()
3675 			tfile->socket.sk->sk_write_space(tfile->socket.sk);  in tun_device_event()
3736 	struct tun_file *tfile;  in tun_get_socket()  local
3739 	tfile = file->private_data;  in tun_get_socket()
3740 	if (!tfile)  in tun_get_socket()
3742 	return &tfile->socket;  in tun_get_socket()
3748 	struct tun_file *tfile;  in tun_get_tx_ring()  local
3752 	tfile = file->private_data;  in tun_get_tx_ring()
3753 	if (!tfile)  in tun_get_tx_ring()
3755 	return &tfile->tx_ring;  in tun_get_tx_ring()