Import of Linux 2.2.12 subset (ipv4 stack and related)

1 files changed, 970 insertions, 0 deletions

diff --git a/pfinet/linux-src/net/ipv4/ipconfig.c b/pfinet/linux-src/net/ipv4/ipconfig.c
new file mode 100644
index 00000000..0770bad1
--- /dev/null
+++ b/pfinet/linux-src/net/ipv4/ipconfig.c
@@ -0,0 +1,970 @@
+/*
+ *  $Id: ipconfig.c,v 1.20.2.1 1999/06/28 11:33:27 davem Exp $
+ *
+ *  Automatic Configuration of IP -- use BOOTP or 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
+ */
+
+#include <linux/config.h>
+#include <linux/types.h>
+#include <linux/string.h>
+#include <linux/kernel.h>
+#include <linux/sched.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/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 <net/arp.h>
+#include <net/ip.h>
+#include <net/ipconfig.h>
+
+#include <asm/segment.h>
+#include <asm/uaccess.h>
+#include <asm/checksum.h>
+
+/* Define this to allow debugging output */
+#undef IPCONFIG_DEBUG
+
+#ifdef IPCONFIG_DEBUG
+#define DBG(x) printk x
+#else
+#define DBG(x) do { } while(0)
+#endif
+
+/* Define the timeout for waiting for a RARP/BOOTP reply */
+#define CONF_BASE_TIMEOUT	(HZ*5)	/* Initial timeout: 5 seconds */
+#define CONF_RETRIES	 	10	/* 10 retries */
+#define CONF_TIMEOUT_RANDOM	(HZ)	/* Maximum amount of randomization */
+#define CONF_TIMEOUT_MULT	*5/4	/* Rate of timeout growth */
+#define CONF_TIMEOUT_MAX	(HZ*30)	/* Maximum allowed timeout */
+
+/* IP configuration */
+static char user_dev_name[IFNAMSIZ] __initdata = { 0, };/* Name of user-selected boot device */
+u32 ic_myaddr __initdata = INADDR_NONE;		/* My IP address */
+u32 ic_servaddr __initdata = INADDR_NONE;	/* Server IP address */
+u32 ic_gateway __initdata = INADDR_NONE;	/* Gateway IP address */
+u32 ic_netmask __initdata = INADDR_NONE;	/* Netmask for local subnet */
+int ic_enable __initdata = 1;			/* Automatic IP configuration enabled */
+int ic_host_name_set __initdata = 0;		/* Host name configured manually */
+int ic_set_manually __initdata = 0;		/* IPconfig parameters set manually */
+
+u32 root_server_addr __initdata = INADDR_NONE;		/* Address of boot server */
+u8 root_server_path[256] __initdata = { 0, };		/* Path to mount as root */
+
+#if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_RARP)
+
+#define CONFIG_IP_PNP_DYNAMIC
+
+static int ic_proto_enabled __initdata = 0			/* Protocols enabled */
+#ifdef CONFIG_IP_PNP_BOOTP
+			| IC_BOOTP
+#endif
+#ifdef CONFIG_IP_PNP_RARP
+			| IC_RARP
+#endif
+			;
+static int ic_got_reply __initdata = 0;				/* Protocol(s) we got reply from */
+
+#else
+
+static int ic_proto_enabled __initdata = 0;
+
+#endif
+
+static int ic_proto_have_if __initdata = 0;
+
+/*
+ *	Network devices
+ */
+
+struct ic_device {
+	struct ic_device *next;
+	struct device *dev;
+	unsigned short flags;
+	int able;
+};
+
+static struct ic_device *ic_first_dev __initdata = NULL;/* List of open device */
+static struct device *ic_dev __initdata = NULL;		/* Selected device */
+
+static int __init ic_open_devs(void)
+{
+	struct ic_device *d, **last;
+	struct device *dev;
+	unsigned short oflags;
+
+	last = &ic_first_dev;
+	for (dev = dev_base; dev; dev = dev->next)
+		if (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))) {
+			int able = 0;
+			if (dev->mtu >= 364)
+				able |= IC_BOOTP;
+			else
+				printk(KERN_WARNING "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) {
+				printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name);
+				continue;
+			}
+			if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL)))
+				return -1;
+			d->dev = dev;
+			*last = d;
+			last = &d->next;
+			d->flags = oflags;
+			d->able = able;
+			ic_proto_have_if |= able;
+			DBG(("IP-Config: Opened %s (able=%d)\n", dev->name, able));
+		}
+	*last = NULL;
+
+	if (!ic_first_dev) {
+		if (user_dev_name[0])
+			printk(KERN_ERR "IP-Config: Device `%s' not found.\n", user_dev_name);
+		else
+			printk(KERN_ERR "IP-Config: No network devices available.\n");
+		return -1;
+	}
+	return 0;
+}
+
+static void __init ic_close_devs(void)
+{
+	struct ic_device *d, *next;
+	struct device *dev;
+
+	next = ic_first_dev;
+	while ((d = next)) {
+		next = d->next;
+		dev = d->dev;
+		if (dev != ic_dev) {
+			DBG(("IP-Config: Downing %s\n", dev->name));
+			dev_change_flags(dev, d->flags);
+		}
+		kfree_s(d, sizeof(struct ic_device));
+	}
+}
+
+/*
+ *	Interface to various network functions.
+ */
+
+static inline void
+set_sockaddr(struct sockaddr_in *sin, u32 addr, u16 port)
+{
+	sin->sin_family = AF_INET;
+	sin->sin_addr.s_addr = addr;
+	sin->sin_port = port;
+}
+
+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 = devinet_ioctl(cmd, 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(cmd, 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->name);
+	set_sockaddr(sin, ic_myaddr, 0);
+	if ((err = ic_dev_ioctl(SIOCSIFADDR, &ir)) < 0) {
+		printk(KERN_ERR "IP-Config: Unable to set interface address (%d).\n", err);
+		return -1;
+	}
+	set_sockaddr(sin, ic_netmask, 0);
+	if ((err = ic_dev_ioctl(SIOCSIFNETMASK, &ir)) < 0) {
+		printk(KERN_ERR "IP-Config: Unable to set interface netmask (%d).\n", err);
+		return -1;
+	}
+	set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0);
+	if ((err = ic_dev_ioctl(SIOCSIFBRDADDR, &ir)) < 0) {
+		printk(KERN_ERR "IP-Config: Unable to set interface broadcast address (%d).\n", err);
+		return -1;
+	}
+	return 0;
+}
+
+static int __init ic_setup_routes(void)
+{
+	/* No need to setup device routes, only the default route... */
+
+	if (ic_gateway != INADDR_NONE) {
+		struct rtentry rm;
+		int err;
+
+		memset(&rm, 0, sizeof(rm));
+		if ((ic_gateway ^ ic_myaddr) & ic_netmask) {
+			printk(KERN_ERR "IP-Config: Gateway not on directly connected network.\n");
+			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) {
+			printk(KERN_ERR "IP-Config: Cannot add default route (%d).\n", 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)
+		strcpy(system_utsname.nodename, in_ntoa(ic_myaddr));
+
+	if (root_server_addr == INADDR_NONE)
+		root_server_addr = ic_servaddr;
+
+	if (ic_netmask == INADDR_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 {
+			printk(KERN_ERR "IP-Config: Unable to guess netmask for address %08x\n", ic_myaddr);
+			return -1;
+		}
+		printk("IP-Config: Guessing netmask %s\n", in_ntoa(ic_netmask));
+	}
+
+	return 0;
+}
+
+/*
+ *	RARP support.
+ */
+
+#ifdef CONFIG_IP_PNP_RARP
+
+static int ic_rarp_recv(struct sk_buff *skb, struct device *dev, struct packet_type *pt);
+
+static struct packet_type rarp_packet_type __initdata = {
+	__constant_htons(ETH_P_RARP),
+	NULL,			/* Listen to all devices */
+	ic_rarp_recv,
+	NULL,
+	NULL
+};
+
+static inline void ic_rarp_init(void)
+{
+	dev_add_pack(&rarp_packet_type);
+}
+
+static inline void 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 device *dev, struct packet_type *pt)
+{
+	struct arphdr *rarp = (struct arphdr *)skb->h.raw;
+	unsigned char *rarp_ptr = (unsigned char *) (rarp + 1);
+	unsigned long sip, tip;
+	unsigned char *sha, *tha;		/* s for "source", t for "target" */
+
+	/* If we already have a reply, just drop the packet */
+	if (ic_got_reply)
+		goto drop;
+
+	/* 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;
+
+	/* 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;
+
+	/* Discard packets which are not from specified server. */
+	if (ic_servaddr != INADDR_NONE && ic_servaddr != sip)
+		goto drop;
+
+	/* Victory! The packet is what we were looking for! */
+	if (!ic_got_reply) {
+		ic_got_reply = IC_RARP;
+		ic_dev = dev;
+		if (ic_myaddr == INADDR_NONE)
+			ic_myaddr = tip;
+		ic_servaddr = sip;
+	}
+
+	/* And throw the packet out... */
+drop:
+	kfree_skb(skb);
+	return 0;
+}
+
+
+/*
+ *  Send RARP request packet over all devices which allow RARP.
+ */
+static void __init ic_rarp_send(void)
+{
+	struct ic_device *d;
+
+	for (d=ic_first_dev; d; d=d->next)
+		if (d->able & IC_RARP) {
+			struct device *dev = d->dev;
+			arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL,
+				 dev->dev_addr, dev->dev_addr);
+		}
+}
+
+#endif
+
+/*
+ *	BOOTP support.
+ */
+
+#ifdef CONFIG_IP_PNP_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 */
+	u32 xid;		/* Transaction ID */
+	u16 secs;		/* Seconds since we started */
+	u16 flags;		/* Just what it says */
+	u32 client_ip;		/* Client's IP address if known */
+	u32 your_ip;		/* Assigned IP address */
+	u32 server_ip;		/* Server's IP address */
+	u32 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 vendor_area[128];	/* Area for extensions */
+};
+
+#define BOOTP_REQUEST 1
+#define BOOTP_REPLY 2
+
+static u32 ic_bootp_xid;
+
+static int ic_bootp_recv(struct sk_buff *skb, struct device *dev, struct packet_type *pt);
+
+static struct packet_type bootp_packet_type __initdata = {
+	__constant_htons(ETH_P_IP),
+	NULL,			/* Listen to all devices */
+	ic_bootp_recv,
+	NULL,
+	NULL
+};
+
+
+/*
+ *  Initialize BOOTP extension fields in the request.
+ */
+static void __init ic_bootp_init_ext(u8 *e)
+{
+	*e++ = 99;		/* RFC1048 Magic Cookie */
+	*e++ = 130;
+	*e++ = 83;
+	*e++ = 99;
+	*e++ = 1;		/* Subnet mask request */
+	*e++ = 4;
+	e += 4;
+	*e++ = 3;		/* Default gateway request */
+	*e++ = 4;
+	e += 4;
+	*e++ = 12;		/* Host name request */
+	*e++ = 32;
+	e += 32;
+	*e++ = 40;		/* NIS Domain name request */
+	*e++ = 32;
+	e += 32;
+	*e++ = 17;		/* Boot path */
+	*e++ = 32;
+	e += 32;
+	*e = 255;		/* End of the list */
+}
+
+
+/*
+ *  Initialize the BOOTP mechanism.
+ */
+static inline void ic_bootp_init(void)
+{
+	get_random_bytes(&ic_bootp_xid, sizeof(u32));
+	DBG(("BOOTP: XID=%08x\n", ic_bootp_xid));
+	dev_add_pack(&bootp_packet_type);
+}
+
+
+/*
+ *  BOOTP cleanup.
+ */
+static inline void ic_bootp_cleanup(void)
+{
+	dev_remove_pack(&bootp_packet_type);
+}
+
+
+/*
+ *  Send BOOTP request to single interface.
+ */
+static void __init ic_bootp_send_if(struct ic_device *d, u32 jiffies)
+{
+	struct device *dev = d->dev;
+	struct sk_buff *skb;
+	struct bootp_pkt *b;
+	int hh_len = (dev->hard_header_len + 15) & ~15;
+	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->nh.iph = h = &b->iph;
+	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 = 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 BOOTP header */
+	b->op = BOOTP_REQUEST;
+	b->htype = dev->type;
+	b->hlen = dev->addr_len;
+	memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
+	b->secs = htons(jiffies / HZ);
+	b->xid = ic_bootp_xid;
+	ic_bootp_init_ext(b->vendor_area);
+
+	/* Chain packet down the line... */
+	skb->dev = dev;
+	skb->protocol = __constant_htons(ETH_P_IP);
+	if ((dev->hard_header &&
+	     dev->hard_header(skb, dev, ntohs(skb->protocol), dev->broadcast, dev->dev_addr, skb->len) < 0) ||
+	    dev_queue_xmit(skb) < 0)
+		printk("E");
+}
+
+
+/*
+ *  Send BOOTP requests to all interfaces.
+ */
+static void __init ic_bootp_send(u32 jiffies)
+{
+	struct ic_device *d;
+
+	for(d=ic_first_dev; d; d=d->next)
+		if (d->able & IC_BOOTP)
+			ic_bootp_send_if(d, jiffies);
+}
+
+
+/*
+ *  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;
+	strncpy(dest, src, len);
+	dest[len] = '\0';
+	return 1;
+}
+
+
+/*
+ *  Process BOOTP extension.
+ */
+static void __init ic_do_bootp_ext(u8 *ext)
+{
+#ifdef IPCONFIG_DEBUG
+	u8 *c;
+
+	printk("BOOTP: Got extension %02x",*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 == INADDR_NONE)
+				memcpy(&ic_netmask, ext+1, 4);
+			break;
+		case 3:		/* Default gateway */
+			if (ic_gateway == INADDR_NONE)
+				memcpy(&ic_gateway, ext+1, 4);
+			break;
+		case 12:	/* Host name */
+			ic_bootp_string(system_utsname.nodename, ext+1, *ext, __NEW_UTS_LEN);
+			ic_host_name_set = 1;
+			break;
+		case 40:	/* NIS Domain name */
+			ic_bootp_string(system_utsname.domainname, ext+1, *ext, __NEW_UTS_LEN);
+			break;
+		case 17:	/* Root path */
+			if (!root_server_path[0])
+				ic_bootp_string(root_server_path, ext+1, *ext, sizeof(root_server_path));
+			break;
+	}
+}
+
+
+/*
+ *  Receive BOOTP reply.
+ */
+static int __init ic_bootp_recv(struct sk_buff *skb, struct device *dev, struct packet_type *pt)
+{
+	struct bootp_pkt *b = (struct bootp_pkt *) skb->nh.iph;
+	struct iphdr *h = &b->iph;
+	int len;
+
+	/* If we already have a reply, just drop the packet */
+	if (ic_got_reply)
+		goto drop;
+
+	/* Check whether it's a BOOTP packet */
+	if (skb->pkt_type == PACKET_OTHERHOST ||
+	    skb->len < sizeof(struct udphdr) + sizeof(struct iphdr) ||
+	    h->ihl != 5 ||
+	    h->version != 4 ||
+	    ip_fast_csum((char *) h, h->ihl) != 0 ||
+	    skb->len < ntohs(h->tot_len) ||
+	    h->protocol != IPPROTO_UDP ||
+	    b->udph.source != htons(67) ||
+	    b->udph.dest != htons(68) ||
+	    ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
+		goto drop;
+
+	/* Fragments are not supported */
+	if (h->frag_off & htons(IP_OFFSET|IP_MF)) {
+		printk(KERN_ERR "BOOTP: Ignoring fragmented reply.\n");
+		goto drop;
+	}
+
+	/* Is it a reply to our BOOTP request? */
+	len = ntohs(b->udph.len) - sizeof(struct udphdr);
+	if (len < 300 ||				    /* See RFC 951:2.1 */
+	    b->op != BOOTP_REPLY ||
+	    b->xid != ic_bootp_xid) {
+		printk("?");
+		goto drop;
+	}
+
+	/* Extract basic fields */
+	ic_myaddr = b->your_ip;
+	ic_servaddr = b->server_ip;
+	ic_got_reply = IC_BOOTP;
+	ic_dev = dev;
+
+	/* Parse extensions */
+	if (b->vendor_area[0] == 99 &&	/* Check magic cookie */
+	    b->vendor_area[1] == 130 &&
+	    b->vendor_area[2] == 83 &&
+	    b->vendor_area[3] == 99) {
+		u8 *ext = &b->vendor_area[4];
+                u8 *end = (u8 *) b + ntohs(b->iph.tot_len);
+		while (ext < end && *ext != 0xff) {
+			if (*ext == 0)		/* Padding */
+				ext++;
+			else {
+				u8 *opt = ext;
+				ext += ext[1] + 2;
+				if (ext <= end)
+					ic_do_bootp_ext(opt);
+			}
+		}
+	}
+
+	if (ic_gateway == INADDR_NONE && b->relay_ip)
+		ic_gateway = b->relay_ip;
+
+drop:
+	kfree_skb(skb);
+	return 0;
+}	
+
+
+#endif
+
+
+/*
+ *	Dynamic IP configuration -- BOOTP and RARP.
+ */
+
+#ifdef CONFIG_IP_PNP_DYNAMIC
+
+static int __init ic_dynamic(void)
+{
+	int retries;
+	unsigned long timeout, jiff;
+	unsigned long start_jiffies;
+	int do_rarp = ic_proto_have_if & IC_RARP;
+	int do_bootp = ic_proto_have_if & IC_BOOTP;
+
+	/*
+	 * If neither BOOTP nor RARP was selected, return with an error. This
+	 * routine gets only called when some pieces of information are mis-
+	 * sing, and without BOOTP and RARP we are not able to get that in-
+	 * formation.
+	 */
+	if (!ic_proto_enabled) {
+		printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
+		return -1;
+	}
+
+#ifdef CONFIG_IP_PNP_BOOTP
+	if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
+		printk(KERN_ERR "BOOTP: No suitable device found.\n");
+#endif
+
+#ifdef CONFIG_IP_PNP_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 RARP and BOOTP protocols
+	 */
+#ifdef CONFIG_IP_PNP_RARP
+	if (do_rarp)
+		ic_rarp_init();
+#endif
+#ifdef CONFIG_IP_PNP_BOOTP
+	if (do_bootp)
+		ic_bootp_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 ? "BOOTP" : "",
+		do_bootp && do_rarp ? " and " : "",
+		do_rarp ? "RARP" : "");
+	start_jiffies = jiffies;
+	retries = CONF_RETRIES;
+	get_random_bytes(&timeout, sizeof(timeout));
+	timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned) CONF_TIMEOUT_RANDOM);
+	for(;;) {
+#ifdef CONFIG_IP_PNP_BOOTP
+		if (do_bootp)
+			ic_bootp_send(jiffies - start_jiffies);
+#endif
+#ifdef CONFIG_IP_PNP_RARP
+		if (do_rarp)
+			ic_rarp_send();
+#endif
+		printk(".");
+		jiff = jiffies + timeout;
+		while (jiffies < jiff && !ic_got_reply)
+			;
+		if (ic_got_reply) {
+			printk(" OK\n");
+			break;
+		}
+		if (! --retries) {
+			printk(" timed out!\n");
+			break;
+		}
+		timeout = timeout CONF_TIMEOUT_MULT;
+		if (timeout > CONF_TIMEOUT_MAX)
+			timeout = CONF_TIMEOUT_MAX;
+	}
+
+#ifdef CONFIG_IP_PNP_RARP
+	if (do_rarp)
+		ic_rarp_cleanup();
+#endif
+#ifdef CONFIG_IP_PNP_BOOTP
+	if (do_bootp)
+		ic_bootp_cleanup();
+#endif
+
+	if (!ic_got_reply)
+		return -1;
+
+	printk("IP-Config: Got %s answer from %s, ",
+		(ic_got_reply & IC_BOOTP) ? "BOOTP" : "RARP",
+		in_ntoa(ic_servaddr));
+	printk("my address is %s\n", in_ntoa(ic_myaddr));
+
+	return 0;
+}
+
+#endif
+
+/*
+ *	IP Autoconfig dispatcher.
+ */
+
+int __init ip_auto_config(void)
+{
+	if (!ic_enable)
+		return 0;
+
+	DBG(("IP-Config: Entered.\n"));
+
+	/* Setup all network devices */
+	if (ic_open_devs() < 0)
+		return -1;
+
+	/*
+	 * 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 == INADDR_NONE ||
+#ifdef CONFIG_ROOT_NFS
+	    (root_server_addr == INADDR_NONE && ic_servaddr == INADDR_NONE) ||
+#endif
+	    ic_first_dev->next) {
+#ifdef CONFIG_IP_PNP_DYNAMIC
+		if (ic_dynamic() < 0) {
+			printk(KERN_ERR "IP-Config: Auto-configuration of network failed.\n");
+			ic_close_devs();
+			return -1;
+		}
+#else
+		printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
+		ic_close_devs();
+		return -1;
+#endif
+	} else {
+		ic_dev = ic_first_dev->dev;	/* Device selected manually or only one device -> use it */
+	}
+
+	/*
+	 * 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;
+
+	DBG(("IP-Config: device=%s, local=%08x, server=%08x, boot=%08x, gw=%08x, mask=%08x\n",
+	    ic_dev->name, ic_myaddr, ic_servaddr, root_server_addr, ic_gateway, ic_netmask));
+	DBG(("IP-Config: host=%s, domain=%s, path=`%s'\n", system_utsname.nodename,
+	    system_utsname.domainname, root_server_path));
+	return 0;
+}
+
+/*
+ *  Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
+ *  command line parameter. It consists of option fields separated by colons in
+ *  the following order:
+ *
+ *  <client-ip>:<server-ip>:<gw-ip>:<netmask>:<host name>:<device>:<bootp|rarp>
+ *
+ *  Any of the fields can be empty which means to use a default value:
+ *	<client-ip>	- address given by BOOTP or RARP
+ *	<server-ip>	- address of host returning BOOTP or RARP packet
+ *	<gw-ip>		- none, or the address returned by BOOTP
+ *	<netmask>	- automatically determined from <client-ip>, or the
+ *			  one returned by BOOTP
+ *	<host name>	- <client-ip> in ASCII notation, or the name returned
+ *			  by BOOTP
+ *	<device>	- use all available devices
+ *	<bootp|rarp|both|off> - use both protocols to determine my own address
+ */
+static int __init ic_proto_name(char *name)
+{
+	if (!strcmp(name, "off")) {
+		ic_proto_enabled = 0;
+		return 1;
+	}
+#ifdef CONFIG_IP_PNP_BOOTP
+	else if (!strcmp(name, "bootp")) {
+		ic_proto_enabled &= ~IC_RARP;
+		return 1;
+	}
+#endif
+#ifdef CONFIG_IP_PNP_RARP
+	else if (!strcmp(name, "rarp")) {
+		ic_proto_enabled &= ~IC_BOOTP;
+		return 1;
+	}
+#endif
+#ifdef CONFIG_IP_PNP_DYNAMIC
+	else if (!strcmp(name, "both")) {
+		return 1;
+	}
+#endif
+	return 0;
+}
+
+void __init ip_auto_config_setup(char *addrs, int *ints)
+{
+	char *cp, *ip, *dp;
+	int num = 0;
+
+	ic_set_manually = 1;
+	if (!strcmp(addrs, "off")) {
+		ic_enable = 0;
+		return;
+	}
+	if (ic_proto_name(addrs))
+		return;
+
+	/* Parse the whole string */
+	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 = INADDR_NONE;
+				break;
+			case 1:
+				if ((ic_servaddr = in_aton(ip)) == INADDR_ANY)
+					ic_servaddr = INADDR_NONE;
+				break;
+			case 2:
+				if ((ic_gateway = in_aton(ip)) == INADDR_ANY)
+					ic_gateway = INADDR_NONE;
+				break;
+			case 3:
+				if ((ic_netmask = in_aton(ip)) == INADDR_ANY)
+					ic_netmask = INADDR_NONE;
+				break;
+			case 4:
+				if ((dp = strchr(ip, '.'))) {
+					*dp++ = '\0';
+					strncpy(system_utsname.domainname, dp, __NEW_UTS_LEN);
+					system_utsname.domainname[__NEW_UTS_LEN] = '\0';
+				}
+				strncpy(system_utsname.nodename, ip, __NEW_UTS_LEN);
+				system_utsname.nodename[__NEW_UTS_LEN] = '\0';
+				ic_host_name_set = 1;
+				break;
+			case 5:
+				strncpy(user_dev_name, ip, IFNAMSIZ);
+				user_dev_name[IFNAMSIZ-1] = '\0';
+				break;
+			case 6:
+				ic_proto_name(ip);
+				break;
+			}
+		}
+		ip = cp;
+		num++;
+	}
+}