summaryrefslogtreecommitdiff
path: root/arch/um/os-Linux/drivers/ethertap_kern.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/um/os-Linux/drivers/ethertap_kern.c')
-rw-r--r--arch/um/os-Linux/drivers/ethertap_kern.c119
1 files changed, 119 insertions, 0 deletions
diff --git a/arch/um/os-Linux/drivers/ethertap_kern.c b/arch/um/os-Linux/drivers/ethertap_kern.c
new file mode 100644
index 000000000000..6ae4b19d9f50
--- /dev/null
+++ b/arch/um/os-Linux/drivers/ethertap_kern.c
@@ -0,0 +1,119 @@
+/*
+ * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and
+ * James Leu (jleu@mindspring.net).
+ * Copyright (C) 2001 by various other people who didn't put their name here.
+ * Licensed under the GPL.
+ */
+
+#include "linux/init.h"
+#include "linux/netdevice.h"
+#include "linux/etherdevice.h"
+#include "net_kern.h"
+#include "net_user.h"
+#include "etap.h"
+
+struct ethertap_init {
+ char *dev_name;
+ char *gate_addr;
+};
+
+static void etap_init(struct net_device *dev, void *data)
+{
+ struct uml_net_private *pri;
+ struct ethertap_data *epri;
+ struct ethertap_init *init = data;
+
+ pri = dev->priv;
+ epri = (struct ethertap_data *) pri->user;
+ epri->dev_name = init->dev_name;
+ epri->gate_addr = init->gate_addr;
+ epri->data_fd = -1;
+ epri->control_fd = -1;
+ epri->dev = dev;
+
+ printk("ethertap backend - %s", epri->dev_name);
+ if (epri->gate_addr != NULL)
+ printk(", IP = %s", epri->gate_addr);
+ printk("\n");
+}
+
+static int etap_read(int fd, struct sk_buff **skb, struct uml_net_private *lp)
+{
+ int len;
+
+ *skb = ether_adjust_skb(*skb, ETH_HEADER_ETHERTAP);
+ if(*skb == NULL) return(-ENOMEM);
+ len = net_recvfrom(fd, (*skb)->mac.raw,
+ (*skb)->dev->mtu + 2 * ETH_HEADER_ETHERTAP);
+ if(len <= 0) return(len);
+ skb_pull(*skb, 2);
+ len -= 2;
+ return(len);
+}
+
+static int etap_write(int fd, struct sk_buff **skb, struct uml_net_private *lp)
+{
+ if(skb_headroom(*skb) < 2){
+ struct sk_buff *skb2;
+
+ skb2 = skb_realloc_headroom(*skb, 2);
+ dev_kfree_skb(*skb);
+ if (skb2 == NULL) return(-ENOMEM);
+ *skb = skb2;
+ }
+ skb_push(*skb, 2);
+ return(net_send(fd, (*skb)->data, (*skb)->len));
+}
+
+struct net_kern_info ethertap_kern_info = {
+ .init = etap_init,
+ .protocol = eth_protocol,
+ .read = etap_read,
+ .write = etap_write,
+};
+
+int ethertap_setup(char *str, char **mac_out, void *data)
+{
+ struct ethertap_init *init = data;
+
+ *init = ((struct ethertap_init)
+ { .dev_name = NULL,
+ .gate_addr = NULL });
+ if(tap_setup_common(str, "ethertap", &init->dev_name, mac_out,
+ &init->gate_addr))
+ return(0);
+ if(init->dev_name == NULL){
+ printk("ethertap_setup : Missing tap device name\n");
+ return(0);
+ }
+
+ return(1);
+}
+
+static struct transport ethertap_transport = {
+ .list = LIST_HEAD_INIT(ethertap_transport.list),
+ .name = "ethertap",
+ .setup = ethertap_setup,
+ .user = &ethertap_user_info,
+ .kern = &ethertap_kern_info,
+ .private_size = sizeof(struct ethertap_data),
+};
+
+static int register_ethertap(void)
+{
+ register_transport(&ethertap_transport);
+ return(1);
+}
+
+__initcall(register_ethertap);
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */