115 lines
2.2 KiB
C
115 lines
2.2 KiB
C
|
/*
|
||
|
|
* Tap functions for AF_VSOCK sockets.
|
||
|
|
*
|
||
|
|
* Code based on net/netlink/af_netlink.c tap functions.
|
||
|
|
*
|
||
|
|
* 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.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/module.h>
|
||
|
|
#include <net/sock.h>
|
||
|
|
#include <net/af_vsock.h>
|
||
|
|
#include <linux/if_arp.h>
|
||
|
|
|
||
|
|
static DEFINE_SPINLOCK(vsock_tap_lock);
|
||
|
|
static struct list_head vsock_tap_all __read_mostly =
|
||
|
|
LIST_HEAD_INIT(vsock_tap_all);
|
||
|
|
|
||
|
|
int vsock_add_tap(struct vsock_tap *vt)
|
||
|
|
{
|
||
|
|
if (unlikely(vt->dev->type != ARPHRD_VSOCKMON))
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
__module_get(vt->module);
|
||
|
|
|
||
|
|
spin_lock(&vsock_tap_lock);
|
||
|
|
list_add_rcu(&vt->list, &vsock_tap_all);
|
||
|
|
spin_unlock(&vsock_tap_lock);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(vsock_add_tap);
|
||
|
|
|
||
|
|
int vsock_remove_tap(struct vsock_tap *vt)
|
||
|
|
{
|
||
|
|
struct vsock_tap *tmp;
|
||
|
|
bool found = false;
|
||
|
|
|
||
|
|
spin_lock(&vsock_tap_lock);
|
||
|
|
|
||
|
|
list_for_each_entry(tmp, &vsock_tap_all, list) {
|
||
|
|
if (vt == tmp) {
|
||
|
|
list_del_rcu(&vt->list);
|
||
|
|
found = true;
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
pr_warn("vsock_remove_tap: %p not found\n", vt);
|
||
|
|
out:
|
||
|
|
spin_unlock(&vsock_tap_lock);
|
||
|
|
|
||
|
|
synchronize_net();
|
||
|
|
|
||
|
|
if (found)
|
||
|
|
module_put(vt->module);
|
||
|
|
|
||
|
|
return found ? 0 : -ENODEV;
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(vsock_remove_tap);
|
||
|
|
|
||
|
|
static int __vsock_deliver_tap_skb(struct sk_buff *skb,
|
||
|
|
struct net_device *dev)
|
||
|
|
{
|
||
|
|
int ret = 0;
|
||
|
|
struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC);
|
||
|
|
|
||
|
|
if (nskb) {
|
||
|
|
dev_hold(dev);
|
||
|
|
|
||
|
|
nskb->dev = dev;
|
||
|
|
ret = dev_queue_xmit(nskb);
|
||
|
|
if (unlikely(ret > 0))
|
||
|
|
ret = net_xmit_errno(ret);
|
||
|
|
|
||
|
|
dev_put(dev);
|
||
|
|
}
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void __vsock_deliver_tap(struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
int ret;
|
||
|
|
struct vsock_tap *tmp;
|
||
|
|
|
||
|
|
list_for_each_entry_rcu(tmp, &vsock_tap_all, list) {
|
||
|
|
ret = __vsock_deliver_tap_skb(skb, tmp->dev);
|
||
|
|
if (unlikely(ret))
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
void vsock_deliver_tap(struct sk_buff *build_skb(void *opaque), void *opaque)
|
||
|
|
{
|
||
|
|
struct sk_buff *skb;
|
||
|
|
|
||
|
|
rcu_read_lock();
|
||
|
|
|
||
|
|
if (likely(list_empty(&vsock_tap_all)))
|
||
|
|
goto out;
|
||
|
|
|
||
|
|
skb = build_skb(opaque);
|
||
|
|
if (skb) {
|
||
|
|
__vsock_deliver_tap(skb);
|
||
|
|
consume_skb(skb);
|
||
|
|
}
|
||
|
|
|
||
|
|
out:
|
||
|
|
rcu_read_unlock();
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(vsock_deliver_tap);
|