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Date: Sat, 28 May 2016 18:29:05 +0200
From: ggarcia@...a.uab.cat
To: netdev@...r.kernel.org
Cc: jhansen@...are.com, stefanha@...hat.com,
Gerard Garcia <ggarcia@...a.uab.cat>
Subject: [RFC 1/3] vsockmon: Add tap functions.
From: Gerard Garcia <ggarcia@...c.uab.cat>
Signed-off-by: Gerard Garcia <ggarcia@...c.uab.cat>
---
include/net/af_vsock.h | 13 ++++++
include/uapi/linux/if_arp.h | 1 +
net/vmw_vsock/af_vsock.c | 105 ++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 119 insertions(+)
diff --git a/include/net/af_vsock.h b/include/net/af_vsock.h
index 15694c9..c4593d8 100644
--- a/include/net/af_vsock.h
+++ b/include/net/af_vsock.h
@@ -187,4 +187,17 @@ struct sock *vsock_find_connected_socket(struct sockaddr_vm *src,
struct sockaddr_vm *dst);
void vsock_for_each_connected_socket(void (*fn)(struct sock *sk));
+/**** TAP ****/
+
+struct vsock_tap {
+ struct net_device *dev;
+ struct module *module;
+ struct list_head list;
+};
+
+extern int vsock_init_tap(void);
+extern int vsock_add_tap(struct vsock_tap *vt);
+extern int vsock_remove_tap(struct vsock_tap *vt);
+extern void vsock_deliver_tap(struct sk_buff *skb);
+
#endif /* __AF_VSOCK_H__ */
diff --git a/include/uapi/linux/if_arp.h b/include/uapi/linux/if_arp.h
index 4d024d7..869262a 100644
--- a/include/uapi/linux/if_arp.h
+++ b/include/uapi/linux/if_arp.h
@@ -95,6 +95,7 @@
#define ARPHRD_IP6GRE 823 /* GRE over IPv6 */
#define ARPHRD_NETLINK 824 /* Netlink header */
#define ARPHRD_6LOWPAN 825 /* IPv6 over LoWPAN */
+#define ARPHRD_VSOCKMON 826 /* Vsock monitor header */
#define ARPHRD_VOID 0xFFFF /* Void type, nothing is known */
#define ARPHRD_NONE 0xFFFE /* zero header length */
diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c
index 6b158ab..ec7a05d 100644
--- a/net/vmw_vsock/af_vsock.c
+++ b/net/vmw_vsock/af_vsock.c
@@ -96,6 +96,7 @@
#include <linux/unistd.h>
#include <linux/wait.h>
#include <linux/workqueue.h>
+#include <linux/if_arp.h>
#include <net/sock.h>
#include <net/af_vsock.h>
@@ -2012,6 +2013,110 @@ const struct vsock_transport *vsock_core_get_transport(void)
}
EXPORT_SYMBOL_GPL(vsock_core_get_transport);
+/**** TAP ****/
+static DEFINE_SPINLOCK(vsock_tap_lock);
+static struct list_head vsock_tap_all __read_mostly;
+
+int vsock_init_tap(void) {
+ INIT_LIST_HEAD(&vsock_tap_all);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(vsock_init_tap);
+
+int vsock_add_tap(struct vsock_tap *vt) {
+ if (unlikely(vt->dev->type != ARPHRD_VSOCKMON))
+ return -EINVAL;
+
+ spin_lock(&vsock_tap_lock);
+ list_add_rcu(&vt->list, &vsock_tap_all);
+ spin_unlock(&vsock_tap_lock);
+
+ __module_get(vt->module);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(vsock_add_tap);
+
+int __vsock_remove_tap(struct vsock_tap *vt) {
+ bool found = false;
+ struct vsock_tap *tmp;
+
+ 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);
+
+ if (found)
+ module_put(vt->module);
+
+ return found ? 0 : -ENODEV;
+}
+
+int vsock_remove_tap(struct vsock_tap *vt)
+{
+ int ret;
+
+ ret = __vsock_remove_tap(vt);
+ synchronize_net();
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(vsock_remove_tap);
+
+static int __vsock_deliver_tap_skb(struct sk_buff *skb,
+ struct net_device *dev)
+{
+ struct sk_buff *vskb;
+ int ret = 0;
+
+ if (skb) {
+ dev_hold(dev);
+ vskb = skb_clone(skb, GFP_ATOMIC);
+ vskb->dev = dev;
+ vskb->pkt_type = PACKET_USER;
+ ret = dev_queue_xmit(vskb);
+ 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 *skb)
+{
+ rcu_read_lock();
+
+ if (unlikely(!list_empty(&vsock_tap_all)))
+ __vsock_deliver_tap(skb);
+
+ rcu_read_unlock();
+}
+EXPORT_SYMBOL_GPL(vsock_deliver_tap);
+
MODULE_AUTHOR("VMware, Inc.");
MODULE_DESCRIPTION("VMware Virtual Socket Family");
MODULE_VERSION("1.0.1.0-k");
--
2.8.3
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