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1b0b04f9fb
Based upon a suggestion by Francois Romieu. Signed-off-by: David S. Miller <davem@davemloft.net>
1543 lines
36 KiB
C
1543 lines
36 KiB
C
/*
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* $Id: ipconfig.c,v 1.46 2002/02/01 22:01:04 davem Exp $
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*
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* Automatic Configuration of IP -- use DHCP, BOOTP, RARP, or
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* user-supplied information to configure own IP address and routes.
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*
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* Copyright (C) 1996-1998 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
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*
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* Derived from network configuration code in fs/nfs/nfsroot.c,
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* originally Copyright (C) 1995, 1996 Gero Kuhlmann and me.
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*
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* BOOTP rewritten to construct and analyse packets itself instead
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* of misusing the IP layer. num_bugs_causing_wrong_arp_replies--;
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* -- MJ, December 1998
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*
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* Fixed ip_auto_config_setup calling at startup in the new "Linker Magic"
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* initialization scheme.
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* - Arnaldo Carvalho de Melo <acme@conectiva.com.br>, 08/11/1999
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*
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* DHCP support added. To users this looks like a whole separate
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* protocol, but we know it's just a bag on the side of BOOTP.
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* -- Chip Salzenberg <chip@valinux.com>, May 2000
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*
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* Ported DHCP support from 2.2.16 to 2.4.0-test4
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* -- Eric Biederman <ebiederman@lnxi.com>, 30 Aug 2000
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*
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* Merged changes from 2.2.19 into 2.4.3
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* -- Eric Biederman <ebiederman@lnxi.com>, 22 April Aug 2001
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*
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* Multiple Nameservers in /proc/net/pnp
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* -- Josef Siemes <jsiemes@web.de>, Aug 2002
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*/
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#include <linux/types.h>
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#include <linux/string.h>
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#include <linux/kernel.h>
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#include <linux/jiffies.h>
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#include <linux/random.h>
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#include <linux/init.h>
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#include <linux/utsname.h>
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#include <linux/in.h>
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#include <linux/if.h>
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#include <linux/inet.h>
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#include <linux/inetdevice.h>
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#include <linux/netdevice.h>
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#include <linux/if_arp.h>
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#include <linux/skbuff.h>
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#include <linux/ip.h>
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#include <linux/socket.h>
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#include <linux/route.h>
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#include <linux/udp.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <linux/major.h>
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#include <linux/root_dev.h>
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#include <linux/delay.h>
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#include <linux/nfs_fs.h>
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#include <net/net_namespace.h>
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#include <net/arp.h>
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#include <net/ip.h>
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#include <net/ipconfig.h>
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#include <net/route.h>
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#include <asm/uaccess.h>
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#include <net/checksum.h>
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#include <asm/processor.h>
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/* Define this to allow debugging output */
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#undef IPCONFIG_DEBUG
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#ifdef IPCONFIG_DEBUG
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#define DBG(x) printk x
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#else
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#define DBG(x) do { } while(0)
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#endif
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#if defined(CONFIG_IP_PNP_DHCP)
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#define IPCONFIG_DHCP
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#endif
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#if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_DHCP)
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#define IPCONFIG_BOOTP
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#endif
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#if defined(CONFIG_IP_PNP_RARP)
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#define IPCONFIG_RARP
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#endif
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#if defined(IPCONFIG_BOOTP) || defined(IPCONFIG_RARP)
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#define IPCONFIG_DYNAMIC
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#endif
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/* Define the friendly delay before and after opening net devices */
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#define CONF_PRE_OPEN 500 /* Before opening: 1/2 second */
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#define CONF_POST_OPEN 1 /* After opening: 1 second */
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/* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */
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#define CONF_OPEN_RETRIES 2 /* (Re)open devices twice */
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#define CONF_SEND_RETRIES 6 /* Send six requests per open */
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#define CONF_INTER_TIMEOUT (HZ/2) /* Inter-device timeout: 1/2 second */
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#define CONF_BASE_TIMEOUT (HZ*2) /* Initial timeout: 2 seconds */
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#define CONF_TIMEOUT_RANDOM (HZ) /* Maximum amount of randomization */
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#define CONF_TIMEOUT_MULT *7/4 /* Rate of timeout growth */
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#define CONF_TIMEOUT_MAX (HZ*30) /* Maximum allowed timeout */
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#define CONF_NAMESERVERS_MAX 3 /* Maximum number of nameservers
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- '3' from resolv.h */
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#define NONE __constant_htonl(INADDR_NONE)
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/*
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* Public IP configuration
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*/
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/* This is used by platforms which might be able to set the ipconfig
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* variables using firmware environment vars. If this is set, it will
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* ignore such firmware variables.
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*/
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int ic_set_manually __initdata = 0; /* IPconfig parameters set manually */
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static int ic_enable __initdata = 0; /* IP config enabled? */
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/* Protocol choice */
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int ic_proto_enabled __initdata = 0
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#ifdef IPCONFIG_BOOTP
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| IC_BOOTP
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#endif
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#ifdef CONFIG_IP_PNP_DHCP
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| IC_USE_DHCP
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#endif
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#ifdef IPCONFIG_RARP
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| IC_RARP
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#endif
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;
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static int ic_host_name_set __initdata = 0; /* Host name set by us? */
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__be32 ic_myaddr = NONE; /* My IP address */
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static __be32 ic_netmask = NONE; /* Netmask for local subnet */
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__be32 ic_gateway = NONE; /* Gateway IP address */
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__be32 ic_servaddr = NONE; /* Boot server IP address */
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__be32 root_server_addr = NONE; /* Address of NFS server */
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u8 root_server_path[256] = { 0, }; /* Path to mount as root */
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/* vendor class identifier */
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static char vendor_class_identifier[253] __initdata;
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/* Persistent data: */
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static int ic_proto_used; /* Protocol used, if any */
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static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */
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static u8 ic_domain[64]; /* DNS (not NIS) domain name */
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/*
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* Private state.
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*/
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/* Name of user-selected boot device */
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static char user_dev_name[IFNAMSIZ] __initdata = { 0, };
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/* Protocols supported by available interfaces */
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static int ic_proto_have_if __initdata = 0;
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#ifdef IPCONFIG_DYNAMIC
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static DEFINE_SPINLOCK(ic_recv_lock);
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static volatile int ic_got_reply __initdata = 0; /* Proto(s) that replied */
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#endif
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#ifdef IPCONFIG_DHCP
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static int ic_dhcp_msgtype __initdata = 0; /* DHCP msg type received */
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#endif
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/*
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* Network devices
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*/
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struct ic_device {
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struct ic_device *next;
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struct net_device *dev;
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unsigned short flags;
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short able;
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__be32 xid;
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};
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static struct ic_device *ic_first_dev __initdata = NULL;/* List of open device */
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static struct net_device *ic_dev __initdata = NULL; /* Selected device */
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static int __init ic_open_devs(void)
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{
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struct ic_device *d, **last;
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struct net_device *dev;
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unsigned short oflags;
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last = &ic_first_dev;
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rtnl_lock();
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/* bring loopback device up first */
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for_each_netdev(&init_net, dev) {
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if (!(dev->flags & IFF_LOOPBACK))
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continue;
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if (dev_change_flags(dev, dev->flags | IFF_UP) < 0)
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printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name);
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}
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for_each_netdev(&init_net, dev) {
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if (dev->flags & IFF_LOOPBACK)
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continue;
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if (user_dev_name[0] ? !strcmp(dev->name, user_dev_name) :
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(!(dev->flags & IFF_LOOPBACK) &&
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(dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) &&
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strncmp(dev->name, "dummy", 5))) {
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int able = 0;
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if (dev->mtu >= 364)
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able |= IC_BOOTP;
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else
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printk(KERN_WARNING "DHCP/BOOTP: Ignoring device %s, MTU %d too small", dev->name, dev->mtu);
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if (!(dev->flags & IFF_NOARP))
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able |= IC_RARP;
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able &= ic_proto_enabled;
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if (ic_proto_enabled && !able)
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continue;
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oflags = dev->flags;
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if (dev_change_flags(dev, oflags | IFF_UP) < 0) {
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printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name);
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continue;
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}
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if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) {
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rtnl_unlock();
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return -1;
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}
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d->dev = dev;
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*last = d;
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last = &d->next;
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d->flags = oflags;
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d->able = able;
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if (able & IC_BOOTP)
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get_random_bytes(&d->xid, sizeof(__be32));
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else
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d->xid = 0;
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ic_proto_have_if |= able;
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DBG(("IP-Config: %s UP (able=%d, xid=%08x)\n",
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dev->name, able, d->xid));
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}
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}
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rtnl_unlock();
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*last = NULL;
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if (!ic_first_dev) {
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if (user_dev_name[0])
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printk(KERN_ERR "IP-Config: Device `%s' not found.\n", user_dev_name);
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else
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printk(KERN_ERR "IP-Config: No network devices available.\n");
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return -1;
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}
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return 0;
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}
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static void __init ic_close_devs(void)
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{
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struct ic_device *d, *next;
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struct net_device *dev;
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rtnl_lock();
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next = ic_first_dev;
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while ((d = next)) {
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next = d->next;
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dev = d->dev;
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if (dev != ic_dev) {
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DBG(("IP-Config: Downing %s\n", dev->name));
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dev_change_flags(dev, d->flags);
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}
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kfree(d);
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}
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rtnl_unlock();
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}
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/*
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* Interface to various network functions.
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*/
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static inline void
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set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port)
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{
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sin->sin_family = AF_INET;
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sin->sin_addr.s_addr = addr;
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sin->sin_port = port;
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}
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static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg)
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{
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int res;
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mm_segment_t oldfs = get_fs();
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set_fs(get_ds());
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res = devinet_ioctl(cmd, (struct ifreq __user *) arg);
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set_fs(oldfs);
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return res;
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}
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static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg)
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{
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int res;
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mm_segment_t oldfs = get_fs();
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set_fs(get_ds());
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res = ip_rt_ioctl(cmd, (void __user *) arg);
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set_fs(oldfs);
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return res;
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}
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/*
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* Set up interface addresses and routes.
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*/
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static int __init ic_setup_if(void)
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{
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struct ifreq ir;
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struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr;
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int err;
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memset(&ir, 0, sizeof(ir));
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strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name);
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set_sockaddr(sin, ic_myaddr, 0);
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if ((err = ic_dev_ioctl(SIOCSIFADDR, &ir)) < 0) {
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printk(KERN_ERR "IP-Config: Unable to set interface address (%d).\n", err);
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return -1;
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}
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set_sockaddr(sin, ic_netmask, 0);
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if ((err = ic_dev_ioctl(SIOCSIFNETMASK, &ir)) < 0) {
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printk(KERN_ERR "IP-Config: Unable to set interface netmask (%d).\n", err);
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return -1;
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}
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set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0);
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if ((err = ic_dev_ioctl(SIOCSIFBRDADDR, &ir)) < 0) {
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printk(KERN_ERR "IP-Config: Unable to set interface broadcast address (%d).\n", err);
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return -1;
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}
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return 0;
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}
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static int __init ic_setup_routes(void)
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{
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/* No need to setup device routes, only the default route... */
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if (ic_gateway != NONE) {
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struct rtentry rm;
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int err;
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memset(&rm, 0, sizeof(rm));
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if ((ic_gateway ^ ic_myaddr) & ic_netmask) {
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printk(KERN_ERR "IP-Config: Gateway not on directly connected network.\n");
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return -1;
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}
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set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0);
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set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0);
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set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0);
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rm.rt_flags = RTF_UP | RTF_GATEWAY;
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if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) {
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printk(KERN_ERR "IP-Config: Cannot add default route (%d).\n", err);
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return -1;
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}
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}
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return 0;
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}
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/*
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* Fill in default values for all missing parameters.
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*/
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static int __init ic_defaults(void)
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{
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/*
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* At this point we have no userspace running so need not
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* claim locks on system_utsname
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*/
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if (!ic_host_name_set)
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sprintf(init_utsname()->nodename, "%u.%u.%u.%u", NIPQUAD(ic_myaddr));
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if (root_server_addr == NONE)
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root_server_addr = ic_servaddr;
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|
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if (ic_netmask == NONE) {
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if (IN_CLASSA(ntohl(ic_myaddr)))
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ic_netmask = htonl(IN_CLASSA_NET);
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else if (IN_CLASSB(ntohl(ic_myaddr)))
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ic_netmask = htonl(IN_CLASSB_NET);
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else if (IN_CLASSC(ntohl(ic_myaddr)))
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ic_netmask = htonl(IN_CLASSC_NET);
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else {
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printk(KERN_ERR "IP-Config: Unable to guess netmask for address %u.%u.%u.%u\n",
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NIPQUAD(ic_myaddr));
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return -1;
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}
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printk("IP-Config: Guessing netmask %u.%u.%u.%u\n", NIPQUAD(ic_netmask));
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}
|
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|
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return 0;
|
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}
|
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|
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/*
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* RARP support.
|
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*/
|
|
|
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#ifdef IPCONFIG_RARP
|
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|
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static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
|
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|
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static struct packet_type rarp_packet_type __initdata = {
|
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.type = __constant_htons(ETH_P_RARP),
|
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.func = ic_rarp_recv,
|
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};
|
|
|
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static inline void ic_rarp_init(void)
|
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{
|
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dev_add_pack(&rarp_packet_type);
|
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}
|
|
|
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static inline void ic_rarp_cleanup(void)
|
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{
|
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dev_remove_pack(&rarp_packet_type);
|
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}
|
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|
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/*
|
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* Process received RARP packet.
|
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*/
|
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static int __init
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ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
|
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{
|
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struct arphdr *rarp;
|
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unsigned char *rarp_ptr;
|
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__be32 sip, tip;
|
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unsigned char *sha, *tha; /* s for "source", t for "target" */
|
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struct ic_device *d;
|
|
|
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if (dev->nd_net != &init_net)
|
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goto drop;
|
|
|
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if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
|
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return NET_RX_DROP;
|
|
|
|
if (!pskb_may_pull(skb, sizeof(struct arphdr)))
|
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goto drop;
|
|
|
|
/* Basic sanity checks can be done without the lock. */
|
|
rarp = (struct arphdr *)skb_transport_header(skb);
|
|
|
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/* If this test doesn't pass, it's not IP, or we should
|
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* ignore it anyway.
|
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*/
|
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if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd))
|
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goto drop;
|
|
|
|
/* If it's not a RARP reply, delete it. */
|
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if (rarp->ar_op != htons(ARPOP_RREPLY))
|
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goto drop;
|
|
|
|
/* If it's not Ethernet, delete it. */
|
|
if (rarp->ar_pro != htons(ETH_P_IP))
|
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goto drop;
|
|
|
|
if (!pskb_may_pull(skb,
|
|
sizeof(struct arphdr) +
|
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(2 * dev->addr_len) +
|
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(2 * 4)))
|
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goto drop;
|
|
|
|
/* OK, it is all there and looks valid, process... */
|
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rarp = (struct arphdr *)skb_transport_header(skb);
|
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rarp_ptr = (unsigned char *) (rarp + 1);
|
|
|
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/* One reply at a time, please. */
|
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spin_lock(&ic_recv_lock);
|
|
|
|
/* If we already have a reply, just drop the packet */
|
|
if (ic_got_reply)
|
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goto drop_unlock;
|
|
|
|
/* Find the ic_device that the packet arrived on */
|
|
d = ic_first_dev;
|
|
while (d && d->dev != dev)
|
|
d = d->next;
|
|
if (!d)
|
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goto drop_unlock; /* should never happen */
|
|
|
|
/* Extract variable-width fields */
|
|
sha = rarp_ptr;
|
|
rarp_ptr += dev->addr_len;
|
|
memcpy(&sip, rarp_ptr, 4);
|
|
rarp_ptr += 4;
|
|
tha = rarp_ptr;
|
|
rarp_ptr += dev->addr_len;
|
|
memcpy(&tip, rarp_ptr, 4);
|
|
|
|
/* Discard packets which are not meant for us. */
|
|
if (memcmp(tha, dev->dev_addr, dev->addr_len))
|
|
goto drop_unlock;
|
|
|
|
/* Discard packets which are not from specified server. */
|
|
if (ic_servaddr != NONE && ic_servaddr != sip)
|
|
goto drop_unlock;
|
|
|
|
/* We have a winner! */
|
|
ic_dev = dev;
|
|
if (ic_myaddr == NONE)
|
|
ic_myaddr = tip;
|
|
ic_servaddr = sip;
|
|
ic_got_reply = IC_RARP;
|
|
|
|
drop_unlock:
|
|
/* Show's over. Nothing to see here. */
|
|
spin_unlock(&ic_recv_lock);
|
|
|
|
drop:
|
|
/* Throw the packet out. */
|
|
kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* Send RARP request packet over a single interface.
|
|
*/
|
|
static void __init ic_rarp_send_if(struct ic_device *d)
|
|
{
|
|
struct net_device *dev = d->dev;
|
|
arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL,
|
|
dev->dev_addr, dev->dev_addr);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* DHCP/BOOTP support.
|
|
*/
|
|
|
|
#ifdef IPCONFIG_BOOTP
|
|
|
|
struct bootp_pkt { /* BOOTP packet format */
|
|
struct iphdr iph; /* IP header */
|
|
struct udphdr udph; /* UDP header */
|
|
u8 op; /* 1=request, 2=reply */
|
|
u8 htype; /* HW address type */
|
|
u8 hlen; /* HW address length */
|
|
u8 hops; /* Used only by gateways */
|
|
__be32 xid; /* Transaction ID */
|
|
__be16 secs; /* Seconds since we started */
|
|
__be16 flags; /* Just what it says */
|
|
__be32 client_ip; /* Client's IP address if known */
|
|
__be32 your_ip; /* Assigned IP address */
|
|
__be32 server_ip; /* (Next, e.g. NFS) Server's IP address */
|
|
__be32 relay_ip; /* IP address of BOOTP relay */
|
|
u8 hw_addr[16]; /* Client's HW address */
|
|
u8 serv_name[64]; /* Server host name */
|
|
u8 boot_file[128]; /* Name of boot file */
|
|
u8 exten[312]; /* DHCP options / BOOTP vendor extensions */
|
|
};
|
|
|
|
/* packet ops */
|
|
#define BOOTP_REQUEST 1
|
|
#define BOOTP_REPLY 2
|
|
|
|
/* DHCP message types */
|
|
#define DHCPDISCOVER 1
|
|
#define DHCPOFFER 2
|
|
#define DHCPREQUEST 3
|
|
#define DHCPDECLINE 4
|
|
#define DHCPACK 5
|
|
#define DHCPNAK 6
|
|
#define DHCPRELEASE 7
|
|
#define DHCPINFORM 8
|
|
|
|
static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
|
|
|
|
static struct packet_type bootp_packet_type __initdata = {
|
|
.type = __constant_htons(ETH_P_IP),
|
|
.func = ic_bootp_recv,
|
|
};
|
|
|
|
|
|
/*
|
|
* Initialize DHCP/BOOTP extension fields in the request.
|
|
*/
|
|
|
|
static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 };
|
|
|
|
#ifdef IPCONFIG_DHCP
|
|
|
|
static void __init
|
|
ic_dhcp_init_options(u8 *options)
|
|
{
|
|
u8 mt = ((ic_servaddr == NONE)
|
|
? DHCPDISCOVER : DHCPREQUEST);
|
|
u8 *e = options;
|
|
int len;
|
|
|
|
#ifdef IPCONFIG_DEBUG
|
|
printk("DHCP: Sending message type %d\n", mt);
|
|
#endif
|
|
|
|
memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */
|
|
e += 4;
|
|
|
|
*e++ = 53; /* DHCP message type */
|
|
*e++ = 1;
|
|
*e++ = mt;
|
|
|
|
if (mt == DHCPREQUEST) {
|
|
*e++ = 54; /* Server ID (IP address) */
|
|
*e++ = 4;
|
|
memcpy(e, &ic_servaddr, 4);
|
|
e += 4;
|
|
|
|
*e++ = 50; /* Requested IP address */
|
|
*e++ = 4;
|
|
memcpy(e, &ic_myaddr, 4);
|
|
e += 4;
|
|
}
|
|
|
|
/* always? */
|
|
{
|
|
static const u8 ic_req_params[] = {
|
|
1, /* Subnet mask */
|
|
3, /* Default gateway */
|
|
6, /* DNS server */
|
|
12, /* Host name */
|
|
15, /* Domain name */
|
|
17, /* Boot path */
|
|
40, /* NIS domain name */
|
|
};
|
|
|
|
*e++ = 55; /* Parameter request list */
|
|
*e++ = sizeof(ic_req_params);
|
|
memcpy(e, ic_req_params, sizeof(ic_req_params));
|
|
e += sizeof(ic_req_params);
|
|
|
|
if (*vendor_class_identifier) {
|
|
printk(KERN_INFO "DHCP: sending class identifier \"%s\"\n",
|
|
vendor_class_identifier);
|
|
*e++ = 60; /* Class-identifier */
|
|
len = strlen(vendor_class_identifier);
|
|
*e++ = len;
|
|
memcpy(e, vendor_class_identifier, len);
|
|
e += len;
|
|
}
|
|
}
|
|
|
|
*e++ = 255; /* End of the list */
|
|
}
|
|
|
|
#endif /* IPCONFIG_DHCP */
|
|
|
|
static void __init ic_bootp_init_ext(u8 *e)
|
|
{
|
|
memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */
|
|
e += 4;
|
|
*e++ = 1; /* Subnet mask request */
|
|
*e++ = 4;
|
|
e += 4;
|
|
*e++ = 3; /* Default gateway request */
|
|
*e++ = 4;
|
|
e += 4;
|
|
*e++ = 5; /* Name server request */
|
|
*e++ = 8;
|
|
e += 8;
|
|
*e++ = 12; /* Host name request */
|
|
*e++ = 32;
|
|
e += 32;
|
|
*e++ = 40; /* NIS Domain name request */
|
|
*e++ = 32;
|
|
e += 32;
|
|
*e++ = 17; /* Boot path */
|
|
*e++ = 40;
|
|
e += 40;
|
|
|
|
*e++ = 57; /* set extension buffer size for reply */
|
|
*e++ = 2;
|
|
*e++ = 1; /* 128+236+8+20+14, see dhcpd sources */
|
|
*e++ = 150;
|
|
|
|
*e++ = 255; /* End of the list */
|
|
}
|
|
|
|
|
|
/*
|
|
* Initialize the DHCP/BOOTP mechanism.
|
|
*/
|
|
static inline void ic_bootp_init(void)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
|
|
ic_nameservers[i] = NONE;
|
|
|
|
dev_add_pack(&bootp_packet_type);
|
|
}
|
|
|
|
|
|
/*
|
|
* DHCP/BOOTP cleanup.
|
|
*/
|
|
static inline void ic_bootp_cleanup(void)
|
|
{
|
|
dev_remove_pack(&bootp_packet_type);
|
|
}
|
|
|
|
|
|
/*
|
|
* Send DHCP/BOOTP request to single interface.
|
|
*/
|
|
static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff)
|
|
{
|
|
struct net_device *dev = d->dev;
|
|
struct sk_buff *skb;
|
|
struct bootp_pkt *b;
|
|
int hh_len = LL_RESERVED_SPACE(dev);
|
|
struct iphdr *h;
|
|
|
|
/* Allocate packet */
|
|
skb = alloc_skb(sizeof(struct bootp_pkt) + hh_len + 15, GFP_KERNEL);
|
|
if (!skb)
|
|
return;
|
|
skb_reserve(skb, hh_len);
|
|
b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt));
|
|
memset(b, 0, sizeof(struct bootp_pkt));
|
|
|
|
/* Construct IP header */
|
|
skb_reset_network_header(skb);
|
|
h = ip_hdr(skb);
|
|
h->version = 4;
|
|
h->ihl = 5;
|
|
h->tot_len = htons(sizeof(struct bootp_pkt));
|
|
h->frag_off = htons(IP_DF);
|
|
h->ttl = 64;
|
|
h->protocol = IPPROTO_UDP;
|
|
h->daddr = htonl(INADDR_BROADCAST);
|
|
h->check = ip_fast_csum((unsigned char *) h, h->ihl);
|
|
|
|
/* Construct UDP header */
|
|
b->udph.source = htons(68);
|
|
b->udph.dest = htons(67);
|
|
b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr));
|
|
/* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */
|
|
|
|
/* Construct DHCP/BOOTP header */
|
|
b->op = BOOTP_REQUEST;
|
|
if (dev->type < 256) /* check for false types */
|
|
b->htype = dev->type;
|
|
else if (dev->type == ARPHRD_IEEE802_TR) /* fix for token ring */
|
|
b->htype = ARPHRD_IEEE802;
|
|
else if (dev->type == ARPHRD_FDDI)
|
|
b->htype = ARPHRD_ETHER;
|
|
else {
|
|
printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name);
|
|
b->htype = dev->type; /* can cause undefined behavior */
|
|
}
|
|
b->hlen = dev->addr_len;
|
|
b->your_ip = NONE;
|
|
b->server_ip = NONE;
|
|
memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
|
|
b->secs = htons(jiffies_diff / HZ);
|
|
b->xid = d->xid;
|
|
|
|
/* add DHCP options or BOOTP extensions */
|
|
#ifdef IPCONFIG_DHCP
|
|
if (ic_proto_enabled & IC_USE_DHCP)
|
|
ic_dhcp_init_options(b->exten);
|
|
else
|
|
#endif
|
|
ic_bootp_init_ext(b->exten);
|
|
|
|
/* Chain packet down the line... */
|
|
skb->dev = dev;
|
|
skb->protocol = htons(ETH_P_IP);
|
|
if (dev_hard_header(skb, dev, ntohs(skb->protocol),
|
|
dev->broadcast, dev->dev_addr, skb->len) < 0 ||
|
|
dev_queue_xmit(skb) < 0)
|
|
printk("E");
|
|
}
|
|
|
|
|
|
/*
|
|
* Copy BOOTP-supplied string if not already set.
|
|
*/
|
|
static int __init ic_bootp_string(char *dest, char *src, int len, int max)
|
|
{
|
|
if (!len)
|
|
return 0;
|
|
if (len > max-1)
|
|
len = max-1;
|
|
memcpy(dest, src, len);
|
|
dest[len] = '\0';
|
|
return 1;
|
|
}
|
|
|
|
|
|
/*
|
|
* Process BOOTP extensions.
|
|
*/
|
|
static void __init ic_do_bootp_ext(u8 *ext)
|
|
{
|
|
u8 servers;
|
|
int i;
|
|
|
|
#ifdef IPCONFIG_DEBUG
|
|
u8 *c;
|
|
|
|
printk("DHCP/BOOTP: Got extension %d:",*ext);
|
|
for (c=ext+2; c<ext+2+ext[1]; c++)
|
|
printk(" %02x", *c);
|
|
printk("\n");
|
|
#endif
|
|
|
|
switch (*ext++) {
|
|
case 1: /* Subnet mask */
|
|
if (ic_netmask == NONE)
|
|
memcpy(&ic_netmask, ext+1, 4);
|
|
break;
|
|
case 3: /* Default gateway */
|
|
if (ic_gateway == NONE)
|
|
memcpy(&ic_gateway, ext+1, 4);
|
|
break;
|
|
case 6: /* DNS server */
|
|
servers= *ext/4;
|
|
if (servers > CONF_NAMESERVERS_MAX)
|
|
servers = CONF_NAMESERVERS_MAX;
|
|
for (i = 0; i < servers; i++) {
|
|
if (ic_nameservers[i] == NONE)
|
|
memcpy(&ic_nameservers[i], ext+1+4*i, 4);
|
|
}
|
|
break;
|
|
case 12: /* Host name */
|
|
ic_bootp_string(utsname()->nodename, ext+1, *ext, __NEW_UTS_LEN);
|
|
ic_host_name_set = 1;
|
|
break;
|
|
case 15: /* Domain name (DNS) */
|
|
ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
|
|
break;
|
|
case 17: /* Root path */
|
|
if (!root_server_path[0])
|
|
ic_bootp_string(root_server_path, ext+1, *ext, sizeof(root_server_path));
|
|
break;
|
|
case 40: /* NIS Domain name (_not_ DNS) */
|
|
ic_bootp_string(utsname()->domainname, ext+1, *ext, __NEW_UTS_LEN);
|
|
break;
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Receive BOOTP reply.
|
|
*/
|
|
static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
|
|
{
|
|
struct bootp_pkt *b;
|
|
struct iphdr *h;
|
|
struct ic_device *d;
|
|
int len, ext_len;
|
|
|
|
if (dev->nd_net != &init_net)
|
|
goto drop;
|
|
|
|
/* Perform verifications before taking the lock. */
|
|
if (skb->pkt_type == PACKET_OTHERHOST)
|
|
goto drop;
|
|
|
|
if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
|
|
return NET_RX_DROP;
|
|
|
|
if (!pskb_may_pull(skb,
|
|
sizeof(struct iphdr) +
|
|
sizeof(struct udphdr)))
|
|
goto drop;
|
|
|
|
b = (struct bootp_pkt *)skb_network_header(skb);
|
|
h = &b->iph;
|
|
|
|
if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP)
|
|
goto drop;
|
|
|
|
/* Fragments are not supported */
|
|
if (h->frag_off & htons(IP_OFFSET | IP_MF)) {
|
|
if (net_ratelimit())
|
|
printk(KERN_ERR "DHCP/BOOTP: Ignoring fragmented "
|
|
"reply.\n");
|
|
goto drop;
|
|
}
|
|
|
|
if (skb->len < ntohs(h->tot_len))
|
|
goto drop;
|
|
|
|
if (ip_fast_csum((char *) h, h->ihl))
|
|
goto drop;
|
|
|
|
if (b->udph.source != htons(67) || b->udph.dest != htons(68))
|
|
goto drop;
|
|
|
|
if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
|
|
goto drop;
|
|
|
|
len = ntohs(b->udph.len) - sizeof(struct udphdr);
|
|
ext_len = len - (sizeof(*b) -
|
|
sizeof(struct iphdr) -
|
|
sizeof(struct udphdr) -
|
|
sizeof(b->exten));
|
|
if (ext_len < 0)
|
|
goto drop;
|
|
|
|
/* Ok the front looks good, make sure we can get at the rest. */
|
|
if (!pskb_may_pull(skb, skb->len))
|
|
goto drop;
|
|
|
|
b = (struct bootp_pkt *)skb_network_header(skb);
|
|
h = &b->iph;
|
|
|
|
/* One reply at a time, please. */
|
|
spin_lock(&ic_recv_lock);
|
|
|
|
/* If we already have a reply, just drop the packet */
|
|
if (ic_got_reply)
|
|
goto drop_unlock;
|
|
|
|
/* Find the ic_device that the packet arrived on */
|
|
d = ic_first_dev;
|
|
while (d && d->dev != dev)
|
|
d = d->next;
|
|
if (!d)
|
|
goto drop_unlock; /* should never happen */
|
|
|
|
/* Is it a reply to our BOOTP request? */
|
|
if (b->op != BOOTP_REPLY ||
|
|
b->xid != d->xid) {
|
|
if (net_ratelimit())
|
|
printk(KERN_ERR "DHCP/BOOTP: Reply not for us, "
|
|
"op[%x] xid[%x]\n",
|
|
b->op, b->xid);
|
|
goto drop_unlock;
|
|
}
|
|
|
|
/* Parse extensions */
|
|
if (ext_len >= 4 &&
|
|
!memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */
|
|
u8 *end = (u8 *) b + ntohs(b->iph.tot_len);
|
|
u8 *ext;
|
|
|
|
#ifdef IPCONFIG_DHCP
|
|
if (ic_proto_enabled & IC_USE_DHCP) {
|
|
__be32 server_id = NONE;
|
|
int mt = 0;
|
|
|
|
ext = &b->exten[4];
|
|
while (ext < end && *ext != 0xff) {
|
|
u8 *opt = ext++;
|
|
if (*opt == 0) /* Padding */
|
|
continue;
|
|
ext += *ext + 1;
|
|
if (ext >= end)
|
|
break;
|
|
switch (*opt) {
|
|
case 53: /* Message type */
|
|
if (opt[1])
|
|
mt = opt[2];
|
|
break;
|
|
case 54: /* Server ID (IP address) */
|
|
if (opt[1] >= 4)
|
|
memcpy(&server_id, opt + 2, 4);
|
|
break;
|
|
}
|
|
}
|
|
|
|
#ifdef IPCONFIG_DEBUG
|
|
printk("DHCP: Got message type %d\n", mt);
|
|
#endif
|
|
|
|
switch (mt) {
|
|
case DHCPOFFER:
|
|
/* While in the process of accepting one offer,
|
|
* ignore all others.
|
|
*/
|
|
if (ic_myaddr != NONE)
|
|
goto drop_unlock;
|
|
|
|
/* Let's accept that offer. */
|
|
ic_myaddr = b->your_ip;
|
|
ic_servaddr = server_id;
|
|
#ifdef IPCONFIG_DEBUG
|
|
printk("DHCP: Offered address %u.%u.%u.%u",
|
|
NIPQUAD(ic_myaddr));
|
|
printk(" by server %u.%u.%u.%u\n",
|
|
NIPQUAD(ic_servaddr));
|
|
#endif
|
|
/* The DHCP indicated server address takes
|
|
* precedence over the bootp header one if
|
|
* they are different.
|
|
*/
|
|
if ((server_id != NONE) &&
|
|
(b->server_ip != server_id))
|
|
b->server_ip = ic_servaddr;
|
|
break;
|
|
|
|
case DHCPACK:
|
|
if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0)
|
|
goto drop_unlock;
|
|
|
|
/* Yeah! */
|
|
break;
|
|
|
|
default:
|
|
/* Urque. Forget it*/
|
|
ic_myaddr = NONE;
|
|
ic_servaddr = NONE;
|
|
goto drop_unlock;
|
|
}
|
|
|
|
ic_dhcp_msgtype = mt;
|
|
|
|
}
|
|
#endif /* IPCONFIG_DHCP */
|
|
|
|
ext = &b->exten[4];
|
|
while (ext < end && *ext != 0xff) {
|
|
u8 *opt = ext++;
|
|
if (*opt == 0) /* Padding */
|
|
continue;
|
|
ext += *ext + 1;
|
|
if (ext < end)
|
|
ic_do_bootp_ext(opt);
|
|
}
|
|
}
|
|
|
|
/* We have a winner! */
|
|
ic_dev = dev;
|
|
ic_myaddr = b->your_ip;
|
|
ic_servaddr = b->server_ip;
|
|
if (ic_gateway == NONE && b->relay_ip)
|
|
ic_gateway = b->relay_ip;
|
|
if (ic_nameservers[0] == NONE)
|
|
ic_nameservers[0] = ic_servaddr;
|
|
ic_got_reply = IC_BOOTP;
|
|
|
|
drop_unlock:
|
|
/* Show's over. Nothing to see here. */
|
|
spin_unlock(&ic_recv_lock);
|
|
|
|
drop:
|
|
/* Throw the packet out. */
|
|
kfree_skb(skb);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
#endif
|
|
|
|
|
|
/*
|
|
* Dynamic IP configuration -- DHCP, BOOTP, RARP.
|
|
*/
|
|
|
|
#ifdef IPCONFIG_DYNAMIC
|
|
|
|
static int __init ic_dynamic(void)
|
|
{
|
|
int retries;
|
|
struct ic_device *d;
|
|
unsigned long start_jiffies, timeout, jiff;
|
|
int do_bootp = ic_proto_have_if & IC_BOOTP;
|
|
int do_rarp = ic_proto_have_if & IC_RARP;
|
|
|
|
/*
|
|
* If none of DHCP/BOOTP/RARP was selected, return with an error.
|
|
* This routine gets only called when some pieces of information
|
|
* are missing, and without DHCP/BOOTP/RARP we are unable to get it.
|
|
*/
|
|
if (!ic_proto_enabled) {
|
|
printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
|
|
return -1;
|
|
}
|
|
|
|
#ifdef IPCONFIG_BOOTP
|
|
if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
|
|
printk(KERN_ERR "DHCP/BOOTP: No suitable device found.\n");
|
|
#endif
|
|
#ifdef IPCONFIG_RARP
|
|
if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)
|
|
printk(KERN_ERR "RARP: No suitable device found.\n");
|
|
#endif
|
|
|
|
if (!ic_proto_have_if)
|
|
/* Error message already printed */
|
|
return -1;
|
|
|
|
/*
|
|
* Setup protocols
|
|
*/
|
|
#ifdef IPCONFIG_BOOTP
|
|
if (do_bootp)
|
|
ic_bootp_init();
|
|
#endif
|
|
#ifdef IPCONFIG_RARP
|
|
if (do_rarp)
|
|
ic_rarp_init();
|
|
#endif
|
|
|
|
/*
|
|
* Send requests and wait, until we get an answer. This loop
|
|
* seems to be a terrible waste of CPU time, but actually there is
|
|
* only one process running at all, so we don't need to use any
|
|
* scheduler functions.
|
|
* [Actually we could now, but the nothing else running note still
|
|
* applies.. - AC]
|
|
*/
|
|
printk(KERN_NOTICE "Sending %s%s%s requests .",
|
|
do_bootp
|
|
? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "",
|
|
(do_bootp && do_rarp) ? " and " : "",
|
|
do_rarp ? "RARP" : "");
|
|
|
|
start_jiffies = jiffies;
|
|
d = ic_first_dev;
|
|
retries = CONF_SEND_RETRIES;
|
|
get_random_bytes(&timeout, sizeof(timeout));
|
|
timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned) CONF_TIMEOUT_RANDOM);
|
|
for (;;) {
|
|
#ifdef IPCONFIG_BOOTP
|
|
if (do_bootp && (d->able & IC_BOOTP))
|
|
ic_bootp_send_if(d, jiffies - start_jiffies);
|
|
#endif
|
|
#ifdef IPCONFIG_RARP
|
|
if (do_rarp && (d->able & IC_RARP))
|
|
ic_rarp_send_if(d);
|
|
#endif
|
|
|
|
jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout);
|
|
while (time_before(jiffies, jiff) && !ic_got_reply)
|
|
schedule_timeout_uninterruptible(1);
|
|
#ifdef IPCONFIG_DHCP
|
|
/* DHCP isn't done until we get a DHCPACK. */
|
|
if ((ic_got_reply & IC_BOOTP)
|
|
&& (ic_proto_enabled & IC_USE_DHCP)
|
|
&& ic_dhcp_msgtype != DHCPACK)
|
|
{
|
|
ic_got_reply = 0;
|
|
printk(",");
|
|
continue;
|
|
}
|
|
#endif /* IPCONFIG_DHCP */
|
|
|
|
if (ic_got_reply) {
|
|
printk(" OK\n");
|
|
break;
|
|
}
|
|
|
|
if ((d = d->next))
|
|
continue;
|
|
|
|
if (! --retries) {
|
|
printk(" timed out!\n");
|
|
break;
|
|
}
|
|
|
|
d = ic_first_dev;
|
|
|
|
timeout = timeout CONF_TIMEOUT_MULT;
|
|
if (timeout > CONF_TIMEOUT_MAX)
|
|
timeout = CONF_TIMEOUT_MAX;
|
|
|
|
printk(".");
|
|
}
|
|
|
|
#ifdef IPCONFIG_BOOTP
|
|
if (do_bootp)
|
|
ic_bootp_cleanup();
|
|
#endif
|
|
#ifdef IPCONFIG_RARP
|
|
if (do_rarp)
|
|
ic_rarp_cleanup();
|
|
#endif
|
|
|
|
if (!ic_got_reply) {
|
|
ic_myaddr = NONE;
|
|
return -1;
|
|
}
|
|
|
|
printk("IP-Config: Got %s answer from %u.%u.%u.%u, ",
|
|
((ic_got_reply & IC_RARP) ? "RARP"
|
|
: (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),
|
|
NIPQUAD(ic_servaddr));
|
|
printk("my address is %u.%u.%u.%u\n", NIPQUAD(ic_myaddr));
|
|
|
|
return 0;
|
|
}
|
|
|
|
#endif /* IPCONFIG_DYNAMIC */
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
|
|
static int pnp_seq_show(struct seq_file *seq, void *v)
|
|
{
|
|
int i;
|
|
|
|
if (ic_proto_used & IC_PROTO)
|
|
seq_printf(seq, "#PROTO: %s\n",
|
|
(ic_proto_used & IC_RARP) ? "RARP"
|
|
: (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP");
|
|
else
|
|
seq_puts(seq, "#MANUAL\n");
|
|
|
|
if (ic_domain[0])
|
|
seq_printf(seq,
|
|
"domain %s\n", ic_domain);
|
|
for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {
|
|
if (ic_nameservers[i] != NONE)
|
|
seq_printf(seq,
|
|
"nameserver %u.%u.%u.%u\n",
|
|
NIPQUAD(ic_nameservers[i]));
|
|
}
|
|
if (ic_servaddr != NONE)
|
|
seq_printf(seq,
|
|
"bootserver %u.%u.%u.%u\n",
|
|
NIPQUAD(ic_servaddr));
|
|
return 0;
|
|
}
|
|
|
|
static int pnp_seq_open(struct inode *indoe, struct file *file)
|
|
{
|
|
return single_open(file, pnp_seq_show, NULL);
|
|
}
|
|
|
|
static const struct file_operations pnp_seq_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = pnp_seq_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
};
|
|
#endif /* CONFIG_PROC_FS */
|
|
|
|
/*
|
|
* Extract IP address from the parameter string if needed. Note that we
|
|
* need to have root_server_addr set _before_ IPConfig gets called as it
|
|
* can override it.
|
|
*/
|
|
__be32 __init root_nfs_parse_addr(char *name)
|
|
{
|
|
__be32 addr;
|
|
int octets = 0;
|
|
char *cp, *cq;
|
|
|
|
cp = cq = name;
|
|
while (octets < 4) {
|
|
while (*cp >= '0' && *cp <= '9')
|
|
cp++;
|
|
if (cp == cq || cp - cq > 3)
|
|
break;
|
|
if (*cp == '.' || octets == 3)
|
|
octets++;
|
|
if (octets < 4)
|
|
cp++;
|
|
cq = cp;
|
|
}
|
|
if (octets == 4 && (*cp == ':' || *cp == '\0')) {
|
|
if (*cp == ':')
|
|
*cp++ = '\0';
|
|
addr = in_aton(name);
|
|
memmove(name, cp, strlen(cp) + 1);
|
|
} else
|
|
addr = NONE;
|
|
|
|
return addr;
|
|
}
|
|
|
|
/*
|
|
* IP Autoconfig dispatcher.
|
|
*/
|
|
|
|
static int __init ip_auto_config(void)
|
|
{
|
|
__be32 addr;
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
proc_net_fops_create(&init_net, "pnp", S_IRUGO, &pnp_seq_fops);
|
|
#endif /* CONFIG_PROC_FS */
|
|
|
|
if (!ic_enable)
|
|
return 0;
|
|
|
|
DBG(("IP-Config: Entered.\n"));
|
|
#ifdef IPCONFIG_DYNAMIC
|
|
try_try_again:
|
|
#endif
|
|
/* Give hardware a chance to settle */
|
|
msleep(CONF_PRE_OPEN);
|
|
|
|
/* Setup all network devices */
|
|
if (ic_open_devs() < 0)
|
|
return -1;
|
|
|
|
/* Give drivers a chance to settle */
|
|
ssleep(CONF_POST_OPEN);
|
|
|
|
/*
|
|
* If the config information is insufficient (e.g., our IP address or
|
|
* IP address of the boot server is missing or we have multiple network
|
|
* interfaces and no default was set), use BOOTP or RARP to get the
|
|
* missing values.
|
|
*/
|
|
if (ic_myaddr == NONE ||
|
|
#ifdef CONFIG_ROOT_NFS
|
|
(root_server_addr == NONE
|
|
&& ic_servaddr == NONE
|
|
&& ROOT_DEV == Root_NFS) ||
|
|
#endif
|
|
ic_first_dev->next) {
|
|
#ifdef IPCONFIG_DYNAMIC
|
|
|
|
int retries = CONF_OPEN_RETRIES;
|
|
|
|
if (ic_dynamic() < 0) {
|
|
ic_close_devs();
|
|
|
|
/*
|
|
* I don't know why, but sometimes the
|
|
* eepro100 driver (at least) gets upset and
|
|
* doesn't work the first time it's opened.
|
|
* But then if you close it and reopen it, it
|
|
* works just fine. So we need to try that at
|
|
* least once before giving up.
|
|
*
|
|
* Also, if the root will be NFS-mounted, we
|
|
* have nowhere to go if DHCP fails. So we
|
|
* just have to keep trying forever.
|
|
*
|
|
* -- Chip
|
|
*/
|
|
#ifdef CONFIG_ROOT_NFS
|
|
if (ROOT_DEV == Root_NFS) {
|
|
printk(KERN_ERR
|
|
"IP-Config: Retrying forever (NFS root)...\n");
|
|
goto try_try_again;
|
|
}
|
|
#endif
|
|
|
|
if (--retries) {
|
|
printk(KERN_ERR
|
|
"IP-Config: Reopening network devices...\n");
|
|
goto try_try_again;
|
|
}
|
|
|
|
/* Oh, well. At least we tried. */
|
|
printk(KERN_ERR "IP-Config: Auto-configuration of network failed.\n");
|
|
return -1;
|
|
}
|
|
#else /* !DYNAMIC */
|
|
printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
|
|
ic_close_devs();
|
|
return -1;
|
|
#endif /* IPCONFIG_DYNAMIC */
|
|
} else {
|
|
/* Device selected manually or only one device -> use it */
|
|
ic_dev = ic_first_dev->dev;
|
|
}
|
|
|
|
addr = root_nfs_parse_addr(root_server_path);
|
|
if (root_server_addr == NONE)
|
|
root_server_addr = addr;
|
|
|
|
/*
|
|
* Use defaults whereever applicable.
|
|
*/
|
|
if (ic_defaults() < 0)
|
|
return -1;
|
|
|
|
/*
|
|
* Close all network devices except the device we've
|
|
* autoconfigured and set up routes.
|
|
*/
|
|
ic_close_devs();
|
|
if (ic_setup_if() < 0 || ic_setup_routes() < 0)
|
|
return -1;
|
|
|
|
/*
|
|
* Record which protocol was actually used.
|
|
*/
|
|
#ifdef IPCONFIG_DYNAMIC
|
|
ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP);
|
|
#endif
|
|
|
|
#ifndef IPCONFIG_SILENT
|
|
/*
|
|
* Clue in the operator.
|
|
*/
|
|
printk("IP-Config: Complete:");
|
|
printk("\n device=%s", ic_dev->name);
|
|
printk(", addr=%u.%u.%u.%u", NIPQUAD(ic_myaddr));
|
|
printk(", mask=%u.%u.%u.%u", NIPQUAD(ic_netmask));
|
|
printk(", gw=%u.%u.%u.%u", NIPQUAD(ic_gateway));
|
|
printk(",\n host=%s, domain=%s, nis-domain=%s",
|
|
utsname()->nodename, ic_domain, utsname()->domainname);
|
|
printk(",\n bootserver=%u.%u.%u.%u", NIPQUAD(ic_servaddr));
|
|
printk(", rootserver=%u.%u.%u.%u", NIPQUAD(root_server_addr));
|
|
printk(", rootpath=%s", root_server_path);
|
|
printk("\n");
|
|
#endif /* !SILENT */
|
|
|
|
return 0;
|
|
}
|
|
|
|
late_initcall(ip_auto_config);
|
|
|
|
|
|
/*
|
|
* Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
|
|
* command line parameter. See Documentation/nfsroot.txt.
|
|
*/
|
|
static int __init ic_proto_name(char *name)
|
|
{
|
|
if (!strcmp(name, "on") || !strcmp(name, "any")) {
|
|
return 1;
|
|
}
|
|
if (!strcmp(name, "off") || !strcmp(name, "none")) {
|
|
return 0;
|
|
}
|
|
#ifdef CONFIG_IP_PNP_DHCP
|
|
else if (!strcmp(name, "dhcp")) {
|
|
ic_proto_enabled &= ~IC_RARP;
|
|
return 1;
|
|
}
|
|
#endif
|
|
#ifdef CONFIG_IP_PNP_BOOTP
|
|
else if (!strcmp(name, "bootp")) {
|
|
ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP);
|
|
return 1;
|
|
}
|
|
#endif
|
|
#ifdef CONFIG_IP_PNP_RARP
|
|
else if (!strcmp(name, "rarp")) {
|
|
ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP);
|
|
return 1;
|
|
}
|
|
#endif
|
|
#ifdef IPCONFIG_DYNAMIC
|
|
else if (!strcmp(name, "both")) {
|
|
ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */
|
|
return 1;
|
|
}
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
static int __init ip_auto_config_setup(char *addrs)
|
|
{
|
|
char *cp, *ip, *dp;
|
|
int num = 0;
|
|
|
|
ic_set_manually = 1;
|
|
ic_enable = 1;
|
|
|
|
/*
|
|
* If any dhcp, bootp etc options are set, leave autoconfig on
|
|
* and skip the below static IP processing.
|
|
*/
|
|
if (ic_proto_name(addrs))
|
|
return 1;
|
|
|
|
/* If no static IP is given, turn off autoconfig and bail. */
|
|
if (*addrs == 0 ||
|
|
strcmp(addrs, "off") == 0 ||
|
|
strcmp(addrs, "none") == 0) {
|
|
ic_enable = 0;
|
|
return 1;
|
|
}
|
|
|
|
/* Parse string for static IP assignment. */
|
|
ip = addrs;
|
|
while (ip && *ip) {
|
|
if ((cp = strchr(ip, ':')))
|
|
*cp++ = '\0';
|
|
if (strlen(ip) > 0) {
|
|
DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip));
|
|
switch (num) {
|
|
case 0:
|
|
if ((ic_myaddr = in_aton(ip)) == INADDR_ANY)
|
|
ic_myaddr = NONE;
|
|
break;
|
|
case 1:
|
|
if ((ic_servaddr = in_aton(ip)) == INADDR_ANY)
|
|
ic_servaddr = NONE;
|
|
break;
|
|
case 2:
|
|
if ((ic_gateway = in_aton(ip)) == INADDR_ANY)
|
|
ic_gateway = NONE;
|
|
break;
|
|
case 3:
|
|
if ((ic_netmask = in_aton(ip)) == INADDR_ANY)
|
|
ic_netmask = NONE;
|
|
break;
|
|
case 4:
|
|
if ((dp = strchr(ip, '.'))) {
|
|
*dp++ = '\0';
|
|
strlcpy(utsname()->domainname, dp,
|
|
sizeof(utsname()->domainname));
|
|
}
|
|
strlcpy(utsname()->nodename, ip,
|
|
sizeof(utsname()->nodename));
|
|
ic_host_name_set = 1;
|
|
break;
|
|
case 5:
|
|
strlcpy(user_dev_name, ip, sizeof(user_dev_name));
|
|
break;
|
|
case 6:
|
|
if (ic_proto_name(ip) == 0 &&
|
|
ic_myaddr == NONE) {
|
|
ic_enable = 0;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
ip = cp;
|
|
num++;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int __init nfsaddrs_config_setup(char *addrs)
|
|
{
|
|
return ip_auto_config_setup(addrs);
|
|
}
|
|
|
|
static int __init vendor_class_identifier_setup(char *addrs)
|
|
{
|
|
if (strlcpy(vendor_class_identifier, addrs,
|
|
sizeof(vendor_class_identifier))
|
|
>= sizeof(vendor_class_identifier))
|
|
printk(KERN_WARNING "DHCP: vendorclass too long, truncated to \"%s\"",
|
|
vendor_class_identifier);
|
|
return 1;
|
|
}
|
|
|
|
__setup("ip=", ip_auto_config_setup);
|
|
__setup("nfsaddrs=", nfsaddrs_config_setup);
|
|
__setup("dhcpclass=", vendor_class_identifier_setup);
|