arch/um/drivers/vde_kern.c

   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
  16 static 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
  39 static 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
  51 static 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
  63 static 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
  70 static 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
 113 static 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
 123 static int register_vde(void)
 124 {
 125         register_transport(&vde_transport);
 126         return 0;
 127 }
 128
 129 late_initcall(register_vde);