/*

   *  Automatic Configuration of IP -- use DHCP, BOOTP, RARP, or
   *  user-supplied information to configure own IP address and routes.
   *
   *  Copyright (C) 1996-1998 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
   *
   *  Derived from network configuration code in fs/nfs/nfsroot.c,
   *  originally Copyright (C) 1995, 1996 Gero Kuhlmann and me.
   *
   *  BOOTP rewritten to construct and analyse packets itself instead
   *  of misusing the IP layer. num_bugs_causing_wrong_arp_replies--;
   *					     -- MJ, December 1998

   *

   *  Fixed ip_auto_config_setup calling at startup in the new "Linker Magic"
   *  initialization scheme.
   *	- Arnaldo Carvalho de Melo <acme@conectiva.com.br>, 08/11/1999
   *
   *  DHCP support added.  To users this looks like a whole separate
   *  protocol, but we know it's just a bag on the side of BOOTP.
   *		-- Chip Salzenberg <chip@valinux.com>, May 2000
   *
   *  Ported DHCP support from 2.2.16 to 2.4.0-test4
   *              -- Eric Biederman <ebiederman@lnxi.com>, 30 Aug 2000
   *
   *  Merged changes from 2.2.19 into 2.4.3
   *              -- Eric Biederman <ebiederman@lnxi.com>, 22 April Aug 2001
   *
   *  Multiple Nameservers in /proc/net/pnp
   *              --  Josef Siemes <jsiemes@web.de>, Aug 2002
   */

  #include <linux/types.h>
  #include <linux/string.h>
  #include <linux/kernel.h>
  #include <linux/jiffies.h>
  #include <linux/random.h>
  #include <linux/init.h>
  #include <linux/utsname.h>
  #include <linux/in.h>
  #include <linux/if.h>
  #include <linux/inet.h>

  #include <linux/inetdevice.h>

  #include <linux/netdevice.h>
  #include <linux/if_arp.h>
  #include <linux/skbuff.h>
  #include <linux/ip.h>
  #include <linux/socket.h>
  #include <linux/route.h>
  #include <linux/udp.h>
  #include <linux/proc_fs.h>
  #include <linux/seq_file.h>
  #include <linux/major.h>
  #include <linux/root_dev.h>
  #include <linux/delay.h>

  #include <linux/nfs_fs.h>

  #include <linux/slab.h>

  #include <linux/export.h>

  #include <net/net_namespace.h>

  #include <net/arp.h>
  #include <net/ip.h>
  #include <net/ipconfig.h>

  #include <net/route.h>

  
  #include <asm/uaccess.h>
  #include <net/checksum.h>
  #include <asm/processor.h>

  #if defined(CONFIG_IP_PNP_DHCP)
  #define IPCONFIG_DHCP
  #endif
  #if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_DHCP)
  #define IPCONFIG_BOOTP
  #endif
  #if defined(CONFIG_IP_PNP_RARP)
  #define IPCONFIG_RARP
  #endif
  #if defined(IPCONFIG_BOOTP) || defined(IPCONFIG_RARP)
  #define IPCONFIG_DYNAMIC
  #endif
  
  /* Define the friendly delay before and after opening net devices */

  #define CONF_POST_OPEN		10	/* After opening: 10 msecs */
  #define CONF_CARRIER_TIMEOUT	120000	/* Wait for carrier timeout */

  
  /* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */
  #define CONF_OPEN_RETRIES 	2	/* (Re)open devices twice */
  #define CONF_SEND_RETRIES 	6	/* Send six requests per open */

  #define CONF_BASE_TIMEOUT	(HZ*2)	/* Initial timeout: 2 seconds */
  #define CONF_TIMEOUT_RANDOM	(HZ)	/* Maximum amount of randomization */
  #define CONF_TIMEOUT_MULT	*7/4	/* Rate of timeout growth */
  #define CONF_TIMEOUT_MAX	(HZ*30)	/* Maximum allowed timeout */

  #define CONF_NAMESERVERS_MAX   3       /* Maximum number of nameservers
  					   - '3' from resolv.h */

  #define NONE cpu_to_be32(INADDR_NONE)
  #define ANY cpu_to_be32(INADDR_ANY)

  
  /*
   * Public IP configuration
   */
  
  /* This is used by platforms which might be able to set the ipconfig
   * variables using firmware environment vars.  If this is set, it will
   * ignore such firmware variables.
   */
  int ic_set_manually __initdata = 0;		/* IPconfig parameters set manually */

  static int ic_enable __initdata;		/* IP config enabled? */

  
  /* Protocol choice */
  int ic_proto_enabled __initdata = 0
  #ifdef IPCONFIG_BOOTP
  			| IC_BOOTP
  #endif
  #ifdef CONFIG_IP_PNP_DHCP
  			| IC_USE_DHCP
  #endif
  #ifdef IPCONFIG_RARP
  			| IC_RARP
  #endif
  			;

  static int ic_host_name_set __initdata;	/* Host name set by us? */

  __be32 ic_myaddr = NONE;		/* My IP address */
  static __be32 ic_netmask = NONE;	/* Netmask for local subnet */
  __be32 ic_gateway = NONE;	/* Gateway IP address */

  #ifdef IPCONFIG_DYNAMIC

  static __be32 ic_addrservaddr = NONE;	/* IP Address of the IP addresses'server */

  #endif

  __be32 ic_servaddr = NONE;	/* Boot server IP address */

  __be32 root_server_addr = NONE;	/* Address of NFS server */

  u8 root_server_path[256] = { 0, };	/* Path to mount as root */

  /* vendor class identifier */
  static char vendor_class_identifier[253] __initdata;

  #if defined(CONFIG_IP_PNP_DHCP)
  static char dhcp_client_identifier[253] __initdata;
  #endif

  /* Persistent data: */

  #ifdef IPCONFIG_DYNAMIC

  static int ic_proto_used;			/* Protocol used, if any */

  #else
  #define ic_proto_used 0
  #endif

  static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */

  static u8 ic_domain[64];		/* DNS (not NIS) domain name */
  
  /*
   * Private state.
   */
  
  /* Name of user-selected boot device */
  static char user_dev_name[IFNAMSIZ] __initdata = { 0, };
  
  /* Protocols supported by available interfaces */

  static int ic_proto_have_if __initdata;

  /* MTU for boot device */

  static int ic_dev_mtu __initdata;

  #ifdef IPCONFIG_DYNAMIC
  static DEFINE_SPINLOCK(ic_recv_lock);

  static volatile int ic_got_reply __initdata;    /* Proto(s) that replied */

  #endif
  #ifdef IPCONFIG_DHCP

  static int ic_dhcp_msgtype __initdata;	/* DHCP msg type received */

  #endif
  
  
  /*
   *	Network devices
   */
  
  struct ic_device {
  	struct ic_device *next;
  	struct net_device *dev;
  	unsigned short flags;
  	short able;

  	__be32 xid;

  };

  static struct ic_device *ic_first_dev __initdata;	/* List of open device */

  static struct ic_device *ic_dev __initdata;		/* Selected device */

  static bool __init ic_is_init_dev(struct net_device *dev)

  {

  	if (dev->flags & IFF_LOOPBACK)
  		return false;
  	return user_dev_name[0] ? !strcmp(dev->name, user_dev_name) :

  	    (!(dev->flags & IFF_LOOPBACK) &&
  	     (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) &&

  	     strncmp(dev->name, "dummy", 5));

  }

  static int __init ic_open_devs(void)
  {
  	struct ic_device *d, **last;
  	struct net_device *dev;
  	unsigned short oflags;

  	unsigned long start, next_msg;

  
  	last = &ic_first_dev;

  	rtnl_lock();

  	/* bring loopback and DSA master network devices up first */

  	for_each_netdev(&init_net, dev) {

  		if (!(dev->flags & IFF_LOOPBACK) && !netdev_uses_dsa(dev))

  			continue;
  		if (dev_change_flags(dev, dev->flags | IFF_UP) < 0)

  			pr_err("IP-Config: Failed to open %s
  ", dev->name);

  	}

  	for_each_netdev(&init_net, dev) {

  		if (ic_is_init_dev(dev)) {

  			int able = 0;
  			if (dev->mtu >= 364)
  				able |= IC_BOOTP;
  			else

  				pr_warn("DHCP/BOOTP: Ignoring device %s, MTU %d too small
  ",

  					dev->name, dev->mtu);

  			if (!(dev->flags & IFF_NOARP))
  				able |= IC_RARP;
  			able &= ic_proto_enabled;
  			if (ic_proto_enabled && !able)
  				continue;
  			oflags = dev->flags;
  			if (dev_change_flags(dev, oflags | IFF_UP) < 0) {

  				pr_err("IP-Config: Failed to open %s
  ",
  				       dev->name);

  				continue;
  			}
  			if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) {

  				rtnl_unlock();

  				return -ENOMEM;

  			}
  			d->dev = dev;
  			*last = d;
  			last = &d->next;
  			d->flags = oflags;
  			d->able = able;
  			if (able & IC_BOOTP)

  				get_random_bytes(&d->xid, sizeof(__be32));

  			else
  				d->xid = 0;
  			ic_proto_have_if |= able;

  			pr_debug("IP-Config: %s UP (able=%d, xid=%08x)
  ",
  				 dev->name, able, d->xid);

  		}
  	}

  	/* no point in waiting if we could not bring up at least one device */
  	if (!ic_first_dev)
  		goto have_carrier;

  	/* wait for a carrier on at least one device */
  	start = jiffies;

  	next_msg = start + msecs_to_jiffies(CONF_CARRIER_TIMEOUT/12);

  	while (time_before(jiffies, start +
  			   msecs_to_jiffies(CONF_CARRIER_TIMEOUT))) {

  		int wait, elapsed;

  		for_each_netdev(&init_net, dev)
  			if (ic_is_init_dev(dev) && netif_carrier_ok(dev))
  				goto have_carrier;
  
  		msleep(1);

  		if (time_before(jiffies, next_msg))

  			continue;
  
  		elapsed = jiffies_to_msecs(jiffies - start);
  		wait = (CONF_CARRIER_TIMEOUT - elapsed + 500)/1000;
  		pr_info("Waiting up to %d more seconds for network.
  ", wait);
  		next_msg = jiffies + msecs_to_jiffies(CONF_CARRIER_TIMEOUT/12);

  	}
  have_carrier:

  	rtnl_unlock();

  
  	*last = NULL;
  
  	if (!ic_first_dev) {
  		if (user_dev_name[0])

  			pr_err("IP-Config: Device `%s' not found
  ",
  			       user_dev_name);

  		else

  			pr_err("IP-Config: No network devices available
  ");

  		return -ENODEV;

  	}
  	return 0;
  }
  
  static void __init ic_close_devs(void)
  {
  	struct ic_device *d, *next;
  	struct net_device *dev;

  	rtnl_lock();

  	next = ic_first_dev;
  	while ((d = next)) {
  		next = d->next;
  		dev = d->dev;

  		if ((!ic_dev || dev != ic_dev->dev) && !netdev_uses_dsa(dev)) {

  			pr_debug("IP-Config: Downing %s
  ", dev->name);

  			dev_change_flags(dev, d->flags);
  		}
  		kfree(d);
  	}

  	rtnl_unlock();

  }
  
  /*
   *	Interface to various network functions.
   */
  
  static inline void

  set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port)

  {
  	sin->sin_family = AF_INET;
  	sin->sin_addr.s_addr = addr;
  	sin->sin_port = port;
  }

  static int __init ic_devinet_ioctl(unsigned int cmd, struct ifreq *arg)

  {
  	int res;
  
  	mm_segment_t oldfs = get_fs();
  	set_fs(get_ds());

  	res = devinet_ioctl(&init_net, cmd, (struct ifreq __user *) arg);

  	set_fs(oldfs);
  	return res;
  }

  static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg)
  {
  	int res;
  
  	mm_segment_t oldfs = get_fs();
  	set_fs(get_ds());
  	res = dev_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
  	set_fs(oldfs);
  	return res;
  }

  static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg)
  {
  	int res;
  
  	mm_segment_t oldfs = get_fs();
  	set_fs(get_ds());

  	res = ip_rt_ioctl(&init_net, cmd, (void __user *) arg);

  	set_fs(oldfs);
  	return res;
  }
  
  /*
   *	Set up interface addresses and routes.
   */
  
  static int __init ic_setup_if(void)
  {
  	struct ifreq ir;
  	struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr;
  	int err;
  
  	memset(&ir, 0, sizeof(ir));

  	strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->dev->name);

  	set_sockaddr(sin, ic_myaddr, 0);

  	if ((err = ic_devinet_ioctl(SIOCSIFADDR, &ir)) < 0) {

  		pr_err("IP-Config: Unable to set interface address (%d)
  ",
  		       err);

  		return -1;
  	}
  	set_sockaddr(sin, ic_netmask, 0);

  	if ((err = ic_devinet_ioctl(SIOCSIFNETMASK, &ir)) < 0) {

  		pr_err("IP-Config: Unable to set interface netmask (%d)
  ",
  		       err);

  		return -1;
  	}
  	set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0);

  	if ((err = ic_devinet_ioctl(SIOCSIFBRDADDR, &ir)) < 0) {

  		pr_err("IP-Config: Unable to set interface broadcast address (%d)
  ",
  		       err);

  		return -1;
  	}

  	/* Handle the case where we need non-standard MTU on the boot link (a network
  	 * using jumbo frames, for instance).  If we can't set the mtu, don't error
  	 * out, we'll try to muddle along.
  	 */
  	if (ic_dev_mtu != 0) {

  		strcpy(ir.ifr_name, ic_dev->dev->name);

  		ir.ifr_mtu = ic_dev_mtu;
  		if ((err = ic_dev_ioctl(SIOCSIFMTU, &ir)) < 0)

  			pr_err("IP-Config: Unable to set interface mtu to %d (%d)
  ",
  			       ic_dev_mtu, err);

  	}

  	return 0;
  }
  
  static int __init ic_setup_routes(void)
  {
  	/* No need to setup device routes, only the default route... */

  	if (ic_gateway != NONE) {

  		struct rtentry rm;
  		int err;
  
  		memset(&rm, 0, sizeof(rm));
  		if ((ic_gateway ^ ic_myaddr) & ic_netmask) {

  			pr_err("IP-Config: Gateway not on directly connected network
  ");

  			return -1;
  		}
  		set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0);
  		set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0);
  		set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0);
  		rm.rt_flags = RTF_UP | RTF_GATEWAY;
  		if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) {

  			pr_err("IP-Config: Cannot add default route (%d)
  ",
  			       err);

  			return -1;
  		}
  	}
  
  	return 0;
  }
  
  /*
   *	Fill in default values for all missing parameters.
   */
  
  static int __init ic_defaults(void)
  {
  	/*
  	 *	At this point we have no userspace running so need not
  	 *	claim locks on system_utsname
  	 */

  	if (!ic_host_name_set)

  		sprintf(init_utsname()->nodename, "%pI4", &ic_myaddr);

  	if (root_server_addr == NONE)

  		root_server_addr = ic_servaddr;

  	if (ic_netmask == NONE) {

  		if (IN_CLASSA(ntohl(ic_myaddr)))
  			ic_netmask = htonl(IN_CLASSA_NET);
  		else if (IN_CLASSB(ntohl(ic_myaddr)))
  			ic_netmask = htonl(IN_CLASSB_NET);
  		else if (IN_CLASSC(ntohl(ic_myaddr)))
  			ic_netmask = htonl(IN_CLASSC_NET);
  		else {

  			pr_err("IP-Config: Unable to guess netmask for address %pI4
  ",
  			       &ic_myaddr);

  			return -1;
  		}

  		pr_notice("IP-Config: Guessing netmask %pI4
  ",
  			  &ic_netmask);

  	}
  
  	return 0;
  }
  
  /*
   *	RARP support.
   */
  
  #ifdef IPCONFIG_RARP

  static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);

  
  static struct packet_type rarp_packet_type __initdata = {

  	.type =	cpu_to_be16(ETH_P_RARP),

  	.func =	ic_rarp_recv,
  };

  static inline void __init ic_rarp_init(void)

  {
  	dev_add_pack(&rarp_packet_type);
  }

  static inline void __init ic_rarp_cleanup(void)

  {
  	dev_remove_pack(&rarp_packet_type);
  }
  
  /*
   *  Process received RARP packet.
   */
  static int __init

  ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)

  {
  	struct arphdr *rarp;
  	unsigned char *rarp_ptr;

  	__be32 sip, tip;

  	unsigned char *tha;		/* t for "target" */

  	struct ic_device *d;

  	if (!net_eq(dev_net(dev), &init_net))

  		goto drop;

  	skb = skb_share_check(skb, GFP_ATOMIC);
  	if (!skb)

  		return NET_RX_DROP;
  
  	if (!pskb_may_pull(skb, sizeof(struct arphdr)))
  		goto drop;
  
  	/* Basic sanity checks can be done without the lock.  */

  	rarp = (struct arphdr *)skb_transport_header(skb);

  
  	/* If this test doesn't pass, it's not IP, or we should
  	 * ignore it anyway.
  	 */
  	if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd))
  		goto drop;
  
  	/* If it's not a RARP reply, delete it. */
  	if (rarp->ar_op != htons(ARPOP_RREPLY))
  		goto drop;
  
  	/* If it's not Ethernet, delete it. */
  	if (rarp->ar_pro != htons(ETH_P_IP))
  		goto drop;

  	if (!pskb_may_pull(skb, arp_hdr_len(dev)))

  		goto drop;
  
  	/* OK, it is all there and looks valid, process... */

  	rarp = (struct arphdr *)skb_transport_header(skb);

  	rarp_ptr = (unsigned char *) (rarp + 1);
  
  	/* 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 */
  
  	/* Extract variable-width fields */

  	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 = d;

  	if (ic_myaddr == NONE)

  		ic_myaddr = tip;
  	ic_servaddr = sip;

  	ic_addrservaddr = 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
  
  /*

   *  Predefine Nameservers
   */
  static inline void __init ic_nameservers_predef(void)
  {
  	int i;
  
  	for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
  		ic_nameservers[i] = NONE;
  }
  
  /*

   *	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 =	cpu_to_be16(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, struct ic_device *d)

  {

  	u8 mt = ((ic_servaddr == NONE)

  		 ? DHCPDISCOVER : DHCPREQUEST);
  	u8 *e = options;

  	int len;

  	pr_debug("DHCP: Sending message type %d (%s)
  ", mt, d->dev->name);

  
  	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 */

  			26,	/* MTU */

  			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 (ic_host_name_set) {
  			*e++ = 12;	/* host-name */
  			len = strlen(utsname()->nodename);
  			*e++ = len;
  			memcpy(e, utsname()->nodename, len);
  			e += len;
  		}

  		if (*vendor_class_identifier) {

  			pr_info("DHCP: sending class identifier \"%s\"
  ",
  				vendor_class_identifier);

  			*e++ = 60;	/* Class-identifier */
  			len = strlen(vendor_class_identifier);
  			*e++ = len;
  			memcpy(e, vendor_class_identifier, len);
  			e += len;
  		}

  		len = strlen(dhcp_client_identifier + 1);
  		/* the minimum length of identifier is 2, include 1 byte type,
  		 * and can not be larger than the length of options
  		 */
  		if (len >= 1 && len < 312 - (e - options) - 1) {
  			*e++ = 61;
  			*e++ = len + 1;
  			memcpy(e, dhcp_client_identifier, len + 1);
  			e += len + 1;
  		}

  	}
  
  	*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 __init ic_bootp_init(void)
  {
  	ic_nameservers_predef();

  
  	dev_add_pack(&bootp_packet_type);
  }
  
  
  /*
   *  DHCP/BOOTP cleanup.
   */

  static inline void __init 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;

  	struct iphdr *h;

  	int hlen = LL_RESERVED_SPACE(dev);
  	int tlen = dev->needed_tailroom;

  
  	/* Allocate packet */

  	skb = alloc_skb(sizeof(struct bootp_pkt) + hlen + tlen + 15,

  			GFP_KERNEL);

  	if (!skb)
  		return;

  	skb_reserve(skb, hlen);

  	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_FDDI)
  		b->htype = ARPHRD_ETHER;
  	else {

  		pr_warn("Unknown ARP type 0x%04x for device %s
  ", dev->type,
  			dev->name);

  		b->htype = dev->type; /* can cause undefined behavior */
  	}

  
  	/* server_ip and your_ip address are both already zero per RFC2131 */

  	b->hlen = dev->addr_len;

  	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, d);

  	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) {
  		kfree_skb(skb);
  		printk("E");
  		return;
  	}
  
  	if (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;
  	__be16 mtu;

  	u8 *c;

  	pr_debug("DHCP/BOOTP: Got extension %d:", *ext);

  	for (c=ext+2; c<ext+2+ext[1]; c++)

  		pr_debug(" %02x", *c);
  	pr_debug("
  ");

  
  	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 26:	/* Interface MTU */
  		memcpy(&mtu, ext+1, sizeof(mtu));
  		ic_dev_mtu = ntohs(mtu);
  		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 (!net_eq(dev_net(dev), &init_net))

  		goto drop;

  	/* Perform verifications before taking the lock.  */
  	if (skb->pkt_type == PACKET_OTHERHOST)
  		goto drop;

  	skb = skb_share_check(skb, GFP_ATOMIC);
  	if (!skb)

  		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 (ip_is_fragment(h)) {

  		net_err_ratelimited("DHCP/BOOTP: Ignoring fragmented reply
  ");

  		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) {

  		net_err_ratelimited("DHCP/BOOTP: Reply not for us on %s, op[%x] xid[%x]
  ",
  				    d->dev->name, 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;

  				}

  			}

  			pr_debug("DHCP: Got message type %d (%s)
  ", mt, d->dev->name);

  
  			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;

  				pr_debug("DHCP: Offered address %pI4 by server %pI4
  ",
  					 &ic_myaddr, &b->iph.saddr);

  				/* 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 = d;

  	ic_myaddr = b->your_ip;
  	ic_servaddr = b->server_ip;

  	ic_addrservaddr = b->iph.saddr;

  	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) {

  		pr_err("IP-Config: Incomplete network configuration information
  ");

  		return -1;
  	}
  
  #ifdef IPCONFIG_BOOTP
  	if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)

  		pr_err("DHCP/BOOTP: No suitable device found
  ");

  #endif
  #ifdef IPCONFIG_RARP
  	if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)

  		pr_err("RARP: No suitable device found
  ");

  #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]
  	 */

  	pr_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 int) 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

  		if (!d->next) {
  			jiff = jiffies + 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;

  			/* continue on device that got the reply */
  			d = ic_dev;

  			pr_cont(",");

  			continue;
  		}
  #endif /* IPCONFIG_DHCP */
  
  		if (ic_got_reply) {

  			pr_cont(" OK
  ");

  			break;
  		}
  
  		if ((d = d->next))
  			continue;
  
  		if (! --retries) {

  			pr_cont(" timed out!
  ");

  			break;
  		}
  
  		d = ic_first_dev;
  
  		timeout = timeout CONF_TIMEOUT_MULT;
  		if (timeout > CONF_TIMEOUT_MAX)
  			timeout = CONF_TIMEOUT_MAX;

  		pr_cont(".");

  	}
  
  #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;

  	}

  	pr_info("IP-Config: Got %s answer from %pI4, my address is %pI4
  ",

  		((ic_got_reply & IC_RARP) ? "RARP"

  		: (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),

  		&ic_addrservaddr, &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
  ",
  			   (ic_proto_used & IC_RARP) ? "RARP"
  			   : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP");
  	else
  		seq_puts(seq, "#MANUAL
  ");
  
  	if (ic_domain[0])
  		seq_printf(seq,
  			   "domain %s
  ", ic_domain);
  	for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {

  		if (ic_nameservers[i] != NONE)

  			seq_printf(seq, "nameserver %pI4
  ",
  				   &ic_nameservers[i]);

  	}

  	if (ic_servaddr != NONE)

  		seq_printf(seq, "bootserver %pI4
  ",
  			   &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;
  }

  #define DEVICE_WAIT_MAX		12 /* 12 seconds */
  
  static int __init wait_for_devices(void)
  {
  	int i;

  	for (i = 0; i < DEVICE_WAIT_MAX; i++) {
  		struct net_device *dev;
  		int found = 0;
  
  		rtnl_lock();
  		for_each_netdev(&init_net, dev) {

  			if (ic_is_init_dev(dev)) {

  				found = 1;
  				break;
  			}
  		}
  		rtnl_unlock();
  		if (found)
  			return 0;
  		ssleep(1);
  	}
  	return -ENODEV;
  }

  /*
   *	IP Autoconfig dispatcher.
   */
  
  static int __init ip_auto_config(void)
  {

  	__be32 addr;

  #ifdef IPCONFIG_DYNAMIC
  	int retries = CONF_OPEN_RETRIES;
  #endif

  	int err;

  	unsigned int i;

  
  #ifdef CONFIG_PROC_FS

  	proc_create("pnp", S_IRUGO, init_net.proc_net, &pnp_seq_fops);

  #endif /* CONFIG_PROC_FS */
  
  	if (!ic_enable)
  		return 0;

  	pr_debug("IP-Config: Entered.
  ");

  #ifdef IPCONFIG_DYNAMIC
   try_try_again:
  #endif

  	/* Wait for devices to appear */
  	err = wait_for_devices();
  	if (err)
  		return err;

  
  	/* Setup all network devices */

  	err = ic_open_devs();
  	if (err)
  		return err;

  
  	/* Give drivers a chance to settle */

  	msleep(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

  		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) {

  				pr_err("IP-Config: Retrying forever (NFS root)...
  ");

  				goto try_try_again;
  			}
  #endif
  
  			if (--retries) {

  				pr_err("IP-Config: Reopening network devices...
  ");

  				goto try_try_again;
  			}
  
  			/* Oh, well.  At least we tried. */

  			pr_err("IP-Config: Auto-configuration of network failed
  ");

  			return -1;
  		}
  #else /* !DYNAMIC */

  		pr_err("IP-Config: Incomplete network configuration information
  ");

  		ic_close_devs();
  		return -1;
  #endif /* IPCONFIG_DYNAMIC */
  	} else {
  		/* Device selected manually or only one device -> use it */

  		ic_dev = ic_first_dev;

  	}
  
  	addr = root_nfs_parse_addr(root_server_path);

  	if (root_server_addr == NONE)

  		root_server_addr = addr;
  
  	/*

  	 * Use defaults wherever applicable.

  	 */
  	if (ic_defaults() < 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.
  	 */

  	pr_info("IP-Config: Complete:
  ");

  
  	pr_info("     device=%s, hwaddr=%*phC, ipaddr=%pI4, mask=%pI4, gw=%pI4
  ",

  		ic_dev->dev->name, ic_dev->dev->addr_len, ic_dev->dev->dev_addr,

  		&ic_myaddr, &ic_netmask, &ic_gateway);

  	pr_info("     host=%s, domain=%s, nis-domain=%s
  ",
  		utsname()->nodename, ic_domain, utsname()->domainname);
  	pr_info("     bootserver=%pI4, rootserver=%pI4, rootpath=%s",
  		&ic_servaddr, &root_server_addr, root_server_path);

  	if (ic_dev_mtu)

  		pr_cont(", mtu=%d", ic_dev_mtu);

  	for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
  		if (ic_nameservers[i] != NONE) {

  			pr_cont("     nameserver%u=%pI4",

  				i, &ic_nameservers[i]);
  			break;
  		}
  	for (i++; i < CONF_NAMESERVERS_MAX; i++)
  		if (ic_nameservers[i] != NONE)

  			pr_cont(", nameserver%u=%pI4", i, &ic_nameservers[i]);
  	pr_cont("
  ");

  #endif /* !SILENT */

  	/*
  	 * Close all network devices except the device we've
  	 * autoconfigured and set up routes.
  	 */

  	if (ic_setup_if() < 0 || ic_setup_routes() < 0)

  		err = -1;
  	else
  		err = 0;

  	ic_close_devs();

  	return err;

  }
  
  late_initcall(ip_auto_config);
  
  
  /*
   *  Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel

   *  command line parameter.  See Documentation/filesystems/nfs/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 (!strncmp(name, "dhcp", 4)) {
  		char *client_id;

  		ic_proto_enabled &= ~IC_RARP;

  		client_id = strstr(name, "dhcp,");
  		if (client_id) {
  			char *v;
  
  			client_id = client_id + 5;
  			v = strchr(client_id, ',');
  			if (!v)
  				return 1;
  			*v = 0;
  			if (kstrtou8(client_id, 0, dhcp_client_identifier))

  				pr_debug("DHCP: Invalid client identifier type
  ");

  			strncpy(dhcp_client_identifier + 1, v + 1, 251);
  			*v = ',';
  		}

  		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;
  	}

  	ic_nameservers_predef();

  	/* Parse string for static IP assignment.  */

  	ip = addrs;
  	while (ip && *ip) {
  		if ((cp = strchr(ip, ':')))
  			*cp++ = '\0';
  		if (strlen(ip) > 0) {

  			pr_debug("IP-Config: Parameter #%d: `%s'
  ", num, ip);

  			switch (num) {
  			case 0:

  				if ((ic_myaddr = in_aton(ip)) == ANY)

  					ic_myaddr = NONE;

  				break;
  			case 1:

  				if ((ic_servaddr = in_aton(ip)) == ANY)

  					ic_servaddr = NONE;

  				break;
  			case 2:

  				if ((ic_gateway = in_aton(ip)) == ANY)

  					ic_gateway = NONE;

  				break;
  			case 3:

  				if ((ic_netmask = in_aton(ip)) == 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;

  			case 7:
  				if (CONF_NAMESERVERS_MAX >= 1) {
  					ic_nameservers[0] = in_aton(ip);
  					if (ic_nameservers[0] == ANY)
  						ic_nameservers[0] = NONE;
  				}
  				break;
  			case 8:
  				if (CONF_NAMESERVERS_MAX >= 2) {
  					ic_nameservers[1] = in_aton(ip);
  					if (ic_nameservers[1] == ANY)
  						ic_nameservers[1] = NONE;
  				}
  				break;

  			}
  		}
  		ip = cp;
  		num++;
  	}
  
  	return 1;
  }

  __setup("ip=", ip_auto_config_setup);

  
  static int __init nfsaddrs_config_setup(char *addrs)
  {
  	return ip_auto_config_setup(addrs);
  }

  __setup("nfsaddrs=", nfsaddrs_config_setup);

  static int __init vendor_class_identifier_setup(char *addrs)
  {
  	if (strlcpy(vendor_class_identifier, addrs,
  		    sizeof(vendor_class_identifier))
  	    >= sizeof(vendor_class_identifier))

  		pr_warn("DHCP: vendorclass too long, truncated to \"%s\"
  ",

  			vendor_class_identifier);

  	return 1;
  }

  __setup("dhcpclass=", vendor_class_identifier_setup);