vde_kern.c

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/*
 * Copyright (C) 2007 Luca Bigliardi ([email protected]).
 * 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 = netdev_priv(dev);
    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);