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/arch/um/drivers/vde_kern.c

http://github.com/mirrors/linux
C | 129 lines | 96 code | 25 blank | 8 comment | 18 complexity | 24cb29e1a1fef43e880dbe5d56e710c8 MD5 | raw file
  1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * Copyright (C) 2007 Luca Bigliardi (shammash@artha.org).
  4 *
  5 * Transport usage:
  6 *  ethN=vde,<vde_switch>,<mac addr>,<port>,<group>,<mode>,<description>
  7 *
  8 */
  9
 10#include <linux/init.h>
 11#include <linux/netdevice.h>
 12#include <net_kern.h>
 13#include <net_user.h>
 14#include "vde.h"
 15
 16static void vde_init(struct net_device *dev, void *data)
 17{
 18	struct vde_init *init = data;
 19	struct uml_net_private *pri;
 20	struct vde_data *vpri;
 21
 22	pri = netdev_priv(dev);
 23	vpri = (struct vde_data *) pri->user;
 24
 25	vpri->vde_switch = init->vde_switch;
 26	vpri->descr = init->descr ? init->descr : "UML vde_transport";
 27	vpri->args = NULL;
 28	vpri->conn = NULL;
 29	vpri->dev = dev;
 30
 31	printk("vde backend - %s, ", vpri->vde_switch ?
 32	       vpri->vde_switch : "(default socket)");
 33
 34	vde_init_libstuff(vpri, init);
 35
 36	printk("\n");
 37}
 38
 39static int vde_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)
 40{
 41	struct vde_data *pri = (struct vde_data *) &lp->user;
 42
 43	if (pri->conn != NULL)
 44		return vde_user_read(pri->conn, skb_mac_header(skb),
 45				     skb->dev->mtu + ETH_HEADER_OTHER);
 46
 47	printk(KERN_ERR "vde_read - we have no VDECONN to read from");
 48	return -EBADF;
 49}
 50
 51static int vde_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
 52{
 53	struct vde_data *pri = (struct vde_data *) &lp->user;
 54
 55	if (pri->conn != NULL)
 56		return vde_user_write((void *)pri->conn, skb->data,
 57				      skb->len);
 58
 59	printk(KERN_ERR "vde_write - we have no VDECONN to write to");
 60	return -EBADF;
 61}
 62
 63static const struct net_kern_info vde_kern_info = {
 64	.init			= vde_init,
 65	.protocol		= eth_protocol,
 66	.read			= vde_read,
 67	.write			= vde_write,
 68};
 69
 70static int vde_setup(char *str, char **mac_out, void *data)
 71{
 72	struct vde_init *init = data;
 73	char *remain, *port_str = NULL, *mode_str = NULL, *last;
 74
 75	*init = ((struct vde_init)
 76		{ .vde_switch		= NULL,
 77		  .descr		= NULL,
 78		  .port			= 0,
 79		  .group		= NULL,
 80		  .mode			= 0 });
 81
 82	remain = split_if_spec(str, &init->vde_switch, mac_out, &port_str,
 83				&init->group, &mode_str, &init->descr, NULL);
 84
 85	if (remain != NULL)
 86		printk(KERN_WARNING "vde_setup - Ignoring extra data :"
 87		       "'%s'\n", remain);
 88
 89	if (port_str != NULL) {
 90		init->port = simple_strtoul(port_str, &last, 10);
 91		if ((*last != '\0') || (last == port_str)) {
 92			printk(KERN_ERR "vde_setup - Bad port : '%s'\n",
 93						port_str);
 94			return 0;
 95		}
 96	}
 97
 98	if (mode_str != NULL) {
 99		init->mode = simple_strtoul(mode_str, &last, 8);
100		if ((*last != '\0') || (last == mode_str)) {
101			printk(KERN_ERR "vde_setup - Bad mode : '%s'\n",
102						mode_str);
103			return 0;
104		}
105	}
106
107	printk(KERN_INFO "Configured vde device: %s\n", init->vde_switch ?
108	       init->vde_switch : "(default socket)");
109
110	return 1;
111}
112
113static struct transport vde_transport = {
114	.list 		= LIST_HEAD_INIT(vde_transport.list),
115	.name 		= "vde",
116	.setup  	= vde_setup,
117	.user 		= &vde_user_info,
118	.kern 		= &vde_kern_info,
119	.private_size 	= sizeof(struct vde_data),
120	.setup_size 	= sizeof(struct vde_init),
121};
122
123static int register_vde(void)
124{
125	register_transport(&vde_transport);
126	return 0;
127}
128
129late_initcall(register_vde);