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>
113 lines
2.5 KiB
C
113 lines
2.5 KiB
C
/*
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* Copyright (C) 2002 Jeff Dike <jdike@karaya.com>
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* Licensed under the GPL.
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*/
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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 "net_kern.h"
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#include "net_user.h"
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#include "pcap_user.h"
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struct pcap_init {
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char *host_if;
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int promisc;
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int optimize;
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char *filter;
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};
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void pcap_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 pcap_data *ppri;
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struct pcap_init *init = data;
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pri = dev->priv;
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ppri = (struct pcap_data *) pri->user;
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ppri->host_if = init->host_if;
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ppri->promisc = init->promisc;
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ppri->optimize = init->optimize;
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ppri->filter = init->filter;
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}
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static int pcap_read(int fd, struct sk_buff **skb,
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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(pcap_user_read(fd, (*skb)->mac.raw,
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(*skb)->dev->mtu + ETH_HEADER_OTHER,
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(struct pcap_data *) &lp->user));
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}
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static int pcap_write(int fd, struct sk_buff **skb, struct uml_net_private *lp)
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{
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return(-EPERM);
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}
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static const struct net_kern_info pcap_kern_info = {
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.init = pcap_init,
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.protocol = eth_protocol,
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.read = pcap_read,
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.write = pcap_write,
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};
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int pcap_setup(char *str, char **mac_out, void *data)
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{
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struct pcap_init *init = data;
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char *remain, *host_if = NULL, *options[2] = { NULL, NULL };
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int i;
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*init = ((struct pcap_init)
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{ .host_if = "eth0",
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.promisc = 1,
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.optimize = 0,
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.filter = NULL });
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remain = split_if_spec(str, &host_if, &init->filter,
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&options[0], &options[1], NULL);
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if(remain != NULL){
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printk(KERN_ERR "pcap_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(host_if != NULL)
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init->host_if = host_if;
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for(i = 0; i < ARRAY_SIZE(options); i++){
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if(options[i] == NULL)
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continue;
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if(!strcmp(options[i], "promisc"))
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init->promisc = 1;
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else if(!strcmp(options[i], "nopromisc"))
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init->promisc = 0;
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else if(!strcmp(options[i], "optimize"))
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init->optimize = 1;
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else if(!strcmp(options[i], "nooptimize"))
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init->optimize = 0;
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else printk("pcap_setup : bad option - '%s'\n", options[i]);
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}
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return(1);
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}
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static struct transport pcap_transport = {
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.list = LIST_HEAD_INIT(pcap_transport.list),
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.name = "pcap",
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.setup = pcap_setup,
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.user = &pcap_user_info,
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.kern = &pcap_kern_info,
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.private_size = sizeof(struct pcap_data),
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.setup_size = sizeof(struct pcap_init),
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};
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static int register_pcap(void)
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{
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register_transport(&pcap_transport);
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return 0;
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}
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late_initcall(register_pcap);
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