Logo Search packages:      
Sourcecode: linux version File versions  Download package

mcast_kern.c

/*
 * user-mode-linux networking multicast transport
 * Copyright (C) 2001 by Harald Welte <laforge@gnumonks.org>
 * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
 *
 * based on the existing uml-networking code, which is
 * 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 "mcast.h"
#include "net_kern.h"

struct mcast_init {
      char *addr;
      int port;
      int ttl;
};

static void mcast_init(struct net_device *dev, void *data)
{
      struct uml_net_private *pri;
      struct mcast_data *dpri;
      struct mcast_init *init = data;

      pri = dev->priv;
      dpri = (struct mcast_data *) pri->user;
      dpri->addr = init->addr;
      dpri->port = init->port;
      dpri->ttl = init->ttl;
      dpri->dev = dev;

      printk("mcast backend multicast address: %s:%u, TTL:%u\n",
             dpri->addr, dpri->port, dpri->ttl);
}

static int mcast_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)
{
      return net_recvfrom(fd, skb_mac_header(skb),
                      skb->dev->mtu + ETH_HEADER_OTHER);
}

static int mcast_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
{
      return mcast_user_write(fd, skb->data, skb->len,
                        (struct mcast_data *) &lp->user);
}

static const struct net_kern_info mcast_kern_info = {
      .init             = mcast_init,
      .protocol         = eth_protocol,
      .read             = mcast_read,
      .write                  = mcast_write,
};

int mcast_setup(char *str, char **mac_out, void *data)
{
      struct mcast_init *init = data;
      char *port_str = NULL, *ttl_str = NULL, *remain;
      char *last;

      *init = ((struct mcast_init)
            { .addr     = "239.192.168.1",
              .port     = 1102,
              .ttl            = 1 });

      remain = split_if_spec(str, mac_out, &init->addr, &port_str, &ttl_str,
                         NULL);
      if (remain != NULL) {
            printk(KERN_ERR "mcast_setup - Extra garbage on "
                   "specification : '%s'\n", remain);
            return 0;
      }

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

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

      printk(KERN_INFO "Configured mcast device: %s:%u-%u\n", init->addr,
             init->port, init->ttl);

      return 1;
}

static struct transport mcast_transport = {
      .list             = LIST_HEAD_INIT(mcast_transport.list),
      .name             = "mcast",
      .setup      = mcast_setup,
      .user             = &mcast_user_info,
      .kern             = &mcast_kern_info,
      .private_size     = sizeof(struct mcast_data),
      .setup_size       = sizeof(struct mcast_init),
};

static int register_mcast(void)
{
      register_transport(&mcast_transport);
      return 0;
}

late_initcall(register_mcast);

Generated by  Doxygen 1.6.0   Back to index