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2874c5fd28
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
111 lines
2.0 KiB
C
111 lines
2.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Tap functions for AF_VSOCK sockets.
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*
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* Code based on net/netlink/af_netlink.c tap functions.
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*/
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#include <linux/module.h>
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#include <net/sock.h>
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#include <net/af_vsock.h>
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#include <linux/if_arp.h>
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static DEFINE_SPINLOCK(vsock_tap_lock);
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static struct list_head vsock_tap_all __read_mostly =
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LIST_HEAD_INIT(vsock_tap_all);
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int vsock_add_tap(struct vsock_tap *vt)
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{
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if (unlikely(vt->dev->type != ARPHRD_VSOCKMON))
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return -EINVAL;
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__module_get(vt->module);
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spin_lock(&vsock_tap_lock);
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list_add_rcu(&vt->list, &vsock_tap_all);
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spin_unlock(&vsock_tap_lock);
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return 0;
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}
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EXPORT_SYMBOL_GPL(vsock_add_tap);
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int vsock_remove_tap(struct vsock_tap *vt)
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{
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struct vsock_tap *tmp;
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bool found = false;
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spin_lock(&vsock_tap_lock);
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list_for_each_entry(tmp, &vsock_tap_all, list) {
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if (vt == tmp) {
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list_del_rcu(&vt->list);
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found = true;
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goto out;
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}
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}
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pr_warn("vsock_remove_tap: %p not found\n", vt);
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out:
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spin_unlock(&vsock_tap_lock);
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synchronize_net();
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if (found)
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module_put(vt->module);
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return found ? 0 : -ENODEV;
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}
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EXPORT_SYMBOL_GPL(vsock_remove_tap);
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static int __vsock_deliver_tap_skb(struct sk_buff *skb,
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struct net_device *dev)
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{
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int ret = 0;
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struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC);
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if (nskb) {
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dev_hold(dev);
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nskb->dev = dev;
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ret = dev_queue_xmit(nskb);
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if (unlikely(ret > 0))
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ret = net_xmit_errno(ret);
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dev_put(dev);
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}
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return ret;
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}
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static void __vsock_deliver_tap(struct sk_buff *skb)
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{
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int ret;
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struct vsock_tap *tmp;
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list_for_each_entry_rcu(tmp, &vsock_tap_all, list) {
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ret = __vsock_deliver_tap_skb(skb, tmp->dev);
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if (unlikely(ret))
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break;
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}
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}
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void vsock_deliver_tap(struct sk_buff *build_skb(void *opaque), void *opaque)
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{
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struct sk_buff *skb;
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rcu_read_lock();
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if (likely(list_empty(&vsock_tap_all)))
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goto out;
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skb = build_skb(opaque);
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if (skb) {
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__vsock_deliver_tap(skb);
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consume_skb(skb);
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}
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out:
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rcu_read_unlock();
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}
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EXPORT_SYMBOL_GPL(vsock_deliver_tap);
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