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vde_kern.c

/*
 * Copyright (C) 2007 Luca Bigliardi (shammash@artha.org).
 * Licensed under the GPL.
 *
 * Transport usage:
 *  ethN=vde,<vde_switch>,<mac addr>,<port>,<group>,<mode>,<description>
 *
 */

#include "linux/init.h"
#include <linux/netdevice.h>
#include "net_kern.h"
#include "net_user.h"
#include "vde.h"

static void vde_init(struct net_device *dev, void *data)
{
      struct vde_init *init = data;
      struct uml_net_private *pri;
      struct vde_data *vpri;

      pri = dev->priv;
      vpri = (struct vde_data *) pri->user;

      vpri->vde_switch = init->vde_switch;
      vpri->descr = init->descr ? init->descr : "UML vde_transport";
      vpri->args = NULL;
      vpri->conn = NULL;
      vpri->dev = dev;

      printk("vde backend - %s, ", vpri->vde_switch ?
             vpri->vde_switch : "(default socket)");

      vde_init_libstuff(vpri, init);

      printk("\n");
}

static int vde_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)
{
      struct vde_data *pri = (struct vde_data *) &lp->user;

      if (pri->conn != NULL)
            return vde_user_read(pri->conn, skb_mac_header(skb),
                             skb->dev->mtu + ETH_HEADER_OTHER);

      printk(KERN_ERR "vde_read - we have no VDECONN to read from");
      return -EBADF;
}

static int vde_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
{
      struct vde_data *pri = (struct vde_data *) &lp->user;

      if (pri->conn != NULL)
            return vde_user_write((void *)pri->conn, skb->data,
                              skb->len);

      printk(KERN_ERR "vde_write - we have no VDECONN to write to");
      return -EBADF;
}

static const struct net_kern_info vde_kern_info = {
      .init             = vde_init,
      .protocol         = eth_protocol,
      .read             = vde_read,
      .write                  = vde_write,
};

static int vde_setup(char *str, char **mac_out, void *data)
{
      struct vde_init *init = data;
      char *remain, *port_str = NULL, *mode_str = NULL, *last;

      *init = ((struct vde_init)
            { .vde_switch           = NULL,
              .descr          = NULL,
              .port                 = 0,
              .group          = NULL,
              .mode                 = 0 });

      remain = split_if_spec(str, &init->vde_switch, mac_out, &port_str,
                        &init->group, &mode_str, &init->descr, NULL);

      if (remain != NULL)
            printk(KERN_WARNING "vde_setup - Ignoring extra data :"
                   "'%s'\n", remain);

      if (port_str != NULL) {
            init->port = simple_strtoul(port_str, &last, 10);
            if ((*last != '\0') || (last == port_str)) {
                  printk(KERN_ERR "vde_setup - Bad port : '%s'\n",
                                    port_str);
                  return 0;
            }
      }

      if (mode_str != NULL) {
            init->mode = simple_strtoul(mode_str, &last, 8);
            if ((*last != '\0') || (last == mode_str)) {
                  printk(KERN_ERR "vde_setup - Bad mode : '%s'\n",
                                    mode_str);
                  return 0;
            }
      }

      printk(KERN_INFO "Configured vde device: %s\n", init->vde_switch ?
             init->vde_switch : "(default socket)");

      return 1;
}

static struct transport vde_transport = {
      .list             = LIST_HEAD_INIT(vde_transport.list),
      .name             = "vde",
      .setup      = vde_setup,
      .user             = &vde_user_info,
      .kern             = &vde_kern_info,
      .private_size     = sizeof(struct vde_data),
      .setup_size       = sizeof(struct vde_init),
};

static int register_vde(void)
{
      register_transport(&vde_transport);
      return 0;
}

late_initcall(register_vde);

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