mirror of
https://github.com/torvalds/linux
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8210fd2a9f
When the UML network driver generates random MACs for its devices, it was possible for a number of UMLs to get the same MACs because the ethernet initialization was done before the random pool was properly seeded. This patch moves the initialization later so that it gets better randomness. Signed-off-by: Jeff Dike <jdike@addtoit.com> Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
131 lines
3.1 KiB
C
131 lines
3.1 KiB
C
/*
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* user-mode-linux networking multicast transport
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* Copyright (C) 2001 by Harald Welte <laforge@gnumonks.org>
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*
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* based on the existing uml-networking code, which is
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* Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and
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* James Leu (jleu@mindspring.net).
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* Copyright (C) 2001 by various other people who didn't put their name here.
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*
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* Licensed under the GPL.
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*/
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#include "linux/kernel.h"
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#include "linux/init.h"
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#include "linux/netdevice.h"
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#include "linux/etherdevice.h"
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#include "linux/in.h"
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#include "linux/inet.h"
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#include "net_kern.h"
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#include "net_user.h"
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#include "mcast.h"
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struct mcast_init {
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char *addr;
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int port;
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int ttl;
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};
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static void mcast_init(struct net_device *dev, void *data)
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{
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struct uml_net_private *pri;
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struct mcast_data *dpri;
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struct mcast_init *init = data;
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pri = dev->priv;
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dpri = (struct mcast_data *) pri->user;
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dpri->addr = init->addr;
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dpri->port = init->port;
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dpri->ttl = init->ttl;
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dpri->dev = dev;
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printk("mcast backend ");
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printk("multicast address: %s:%u, TTL:%u ",
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dpri->addr, dpri->port, dpri->ttl);
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printk("\n");
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}
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static int mcast_read(int fd, struct sk_buff **skb, struct uml_net_private *lp)
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{
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*skb = ether_adjust_skb(*skb, ETH_HEADER_OTHER);
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if(*skb == NULL) return(-ENOMEM);
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return(net_recvfrom(fd, (*skb)->mac.raw,
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(*skb)->dev->mtu + ETH_HEADER_OTHER));
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}
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static int mcast_write(int fd, struct sk_buff **skb,
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struct uml_net_private *lp)
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{
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return mcast_user_write(fd, (*skb)->data, (*skb)->len,
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(struct mcast_data *) &lp->user);
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}
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static const struct net_kern_info mcast_kern_info = {
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.init = mcast_init,
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.protocol = eth_protocol,
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.read = mcast_read,
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.write = mcast_write,
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};
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int mcast_setup(char *str, char **mac_out, void *data)
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{
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struct mcast_init *init = data;
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char *port_str = NULL, *ttl_str = NULL, *remain;
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char *last;
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*init = ((struct mcast_init)
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{ .addr = "239.192.168.1",
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.port = 1102,
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.ttl = 1 });
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remain = split_if_spec(str, mac_out, &init->addr, &port_str, &ttl_str,
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NULL);
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if(remain != NULL){
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printk(KERN_ERR "mcast_setup - Extra garbage on "
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"specification : '%s'\n", remain);
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return(0);
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}
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if(port_str != NULL){
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init->port = simple_strtoul(port_str, &last, 10);
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if((*last != '\0') || (last == port_str)){
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printk(KERN_ERR "mcast_setup - Bad port : '%s'\n",
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port_str);
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return(0);
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}
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}
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if(ttl_str != NULL){
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init->ttl = simple_strtoul(ttl_str, &last, 10);
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if((*last != '\0') || (last == ttl_str)){
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printk(KERN_ERR "mcast_setup - Bad ttl : '%s'\n",
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ttl_str);
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return(0);
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}
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}
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printk(KERN_INFO "Configured mcast device: %s:%u-%u\n", init->addr,
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init->port, init->ttl);
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return(1);
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}
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static struct transport mcast_transport = {
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.list = LIST_HEAD_INIT(mcast_transport.list),
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.name = "mcast",
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.setup = mcast_setup,
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.user = &mcast_user_info,
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.kern = &mcast_kern_info,
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.private_size = sizeof(struct mcast_data),
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.setup_size = sizeof(struct mcast_init),
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};
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static int register_mcast(void)
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{
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register_transport(&mcast_transport);
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return 0;
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}
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late_initcall(register_mcast);
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