[NET]: ipconfig and nfsroot annotations
[linux-2.6.git] / net / ipv4 / ipconfig.c
1 /*
2  *  $Id: ipconfig.c,v 1.46 2002/02/01 22:01:04 davem Exp $
3  *
4  *  Automatic Configuration of IP -- use DHCP, BOOTP, RARP, or
5  *  user-supplied information to configure own IP address and routes.
6  *
7  *  Copyright (C) 1996-1998 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
8  *
9  *  Derived from network configuration code in fs/nfs/nfsroot.c,
10  *  originally Copyright (C) 1995, 1996 Gero Kuhlmann and me.
11  *
12  *  BOOTP rewritten to construct and analyse packets itself instead
13  *  of misusing the IP layer. num_bugs_causing_wrong_arp_replies--;
14  *                                           -- MJ, December 1998
15  *  
16  *  Fixed ip_auto_config_setup calling at startup in the new "Linker Magic"
17  *  initialization scheme.
18  *      - Arnaldo Carvalho de Melo <acme@conectiva.com.br>, 08/11/1999
19  *
20  *  DHCP support added.  To users this looks like a whole separate
21  *  protocol, but we know it's just a bag on the side of BOOTP.
22  *              -- Chip Salzenberg <chip@valinux.com>, May 2000
23  *
24  *  Ported DHCP support from 2.2.16 to 2.4.0-test4
25  *              -- Eric Biederman <ebiederman@lnxi.com>, 30 Aug 2000
26  *
27  *  Merged changes from 2.2.19 into 2.4.3
28  *              -- Eric Biederman <ebiederman@lnxi.com>, 22 April Aug 2001
29  *
30  *  Multiple Nameservers in /proc/net/pnp
31  *              --  Josef Siemes <jsiemes@web.de>, Aug 2002
32  */
33
34 #include <linux/types.h>
35 #include <linux/string.h>
36 #include <linux/kernel.h>
37 #include <linux/jiffies.h>
38 #include <linux/random.h>
39 #include <linux/init.h>
40 #include <linux/utsname.h>
41 #include <linux/in.h>
42 #include <linux/if.h>
43 #include <linux/inet.h>
44 #include <linux/inetdevice.h>
45 #include <linux/netdevice.h>
46 #include <linux/if_arp.h>
47 #include <linux/skbuff.h>
48 #include <linux/ip.h>
49 #include <linux/socket.h>
50 #include <linux/route.h>
51 #include <linux/udp.h>
52 #include <linux/proc_fs.h>
53 #include <linux/seq_file.h>
54 #include <linux/major.h>
55 #include <linux/root_dev.h>
56 #include <linux/delay.h>
57 #include <linux/nfs_fs.h>
58 #include <net/arp.h>
59 #include <net/ip.h>
60 #include <net/ipconfig.h>
61 #include <net/route.h>
62
63 #include <asm/uaccess.h>
64 #include <net/checksum.h>
65 #include <asm/processor.h>
66
67 /* Define this to allow debugging output */
68 #undef IPCONFIG_DEBUG
69
70 #ifdef IPCONFIG_DEBUG
71 #define DBG(x) printk x
72 #else
73 #define DBG(x) do { } while(0)
74 #endif
75
76 #if defined(CONFIG_IP_PNP_DHCP)
77 #define IPCONFIG_DHCP
78 #endif
79 #if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_DHCP)
80 #define IPCONFIG_BOOTP
81 #endif
82 #if defined(CONFIG_IP_PNP_RARP)
83 #define IPCONFIG_RARP
84 #endif
85 #if defined(IPCONFIG_BOOTP) || defined(IPCONFIG_RARP)
86 #define IPCONFIG_DYNAMIC
87 #endif
88
89 /* Define the friendly delay before and after opening net devices */
90 #define CONF_PRE_OPEN           500     /* Before opening: 1/2 second */
91 #define CONF_POST_OPEN          1       /* After opening: 1 second */
92
93 /* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */
94 #define CONF_OPEN_RETRIES       2       /* (Re)open devices twice */
95 #define CONF_SEND_RETRIES       6       /* Send six requests per open */
96 #define CONF_INTER_TIMEOUT      (HZ/2)  /* Inter-device timeout: 1/2 second */
97 #define CONF_BASE_TIMEOUT       (HZ*2)  /* Initial timeout: 2 seconds */
98 #define CONF_TIMEOUT_RANDOM     (HZ)    /* Maximum amount of randomization */
99 #define CONF_TIMEOUT_MULT       *7/4    /* Rate of timeout growth */
100 #define CONF_TIMEOUT_MAX        (HZ*30) /* Maximum allowed timeout */
101 #define CONF_NAMESERVERS_MAX   3       /* Maximum number of nameservers  
102                                            - '3' from resolv.h */
103
104 #define NONE __constant_htonl(INADDR_NONE)
105
106 /*
107  * Public IP configuration
108  */
109
110 /* This is used by platforms which might be able to set the ipconfig
111  * variables using firmware environment vars.  If this is set, it will
112  * ignore such firmware variables.
113  */
114 int ic_set_manually __initdata = 0;             /* IPconfig parameters set manually */
115
116 static int ic_enable __initdata = 0;            /* IP config enabled? */
117
118 /* Protocol choice */
119 int ic_proto_enabled __initdata = 0
120 #ifdef IPCONFIG_BOOTP
121                         | IC_BOOTP
122 #endif
123 #ifdef CONFIG_IP_PNP_DHCP
124                         | IC_USE_DHCP
125 #endif
126 #ifdef IPCONFIG_RARP
127                         | IC_RARP
128 #endif
129                         ;
130
131 static int ic_host_name_set __initdata = 0;     /* Host name set by us? */
132
133 __be32 ic_myaddr = NONE;                /* My IP address */
134 static __be32 ic_netmask = NONE;        /* Netmask for local subnet */
135 __be32 ic_gateway = NONE;       /* Gateway IP address */
136
137 __be32 ic_servaddr = NONE;      /* Boot server IP address */
138
139 __be32 root_server_addr = NONE; /* Address of NFS server */
140 u8 root_server_path[256] = { 0, };      /* Path to mount as root */
141
142 /* Persistent data: */
143
144 static int ic_proto_used;                       /* Protocol used, if any */
145 static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */
146 static u8 ic_domain[64];                /* DNS (not NIS) domain name */
147
148 /*
149  * Private state.
150  */
151
152 /* Name of user-selected boot device */
153 static char user_dev_name[IFNAMSIZ] __initdata = { 0, };
154
155 /* Protocols supported by available interfaces */
156 static int ic_proto_have_if __initdata = 0;
157
158 #ifdef IPCONFIG_DYNAMIC
159 static DEFINE_SPINLOCK(ic_recv_lock);
160 static volatile int ic_got_reply __initdata = 0;    /* Proto(s) that replied */
161 #endif
162 #ifdef IPCONFIG_DHCP
163 static int ic_dhcp_msgtype __initdata = 0;      /* DHCP msg type received */
164 #endif
165
166
167 /*
168  *      Network devices
169  */
170
171 struct ic_device {
172         struct ic_device *next;
173         struct net_device *dev;
174         unsigned short flags;
175         short able;
176         __be32 xid;
177 };
178
179 static struct ic_device *ic_first_dev __initdata = NULL;/* List of open device */
180 static struct net_device *ic_dev __initdata = NULL;     /* Selected device */
181
182 static int __init ic_open_devs(void)
183 {
184         struct ic_device *d, **last;
185         struct net_device *dev;
186         unsigned short oflags;
187
188         last = &ic_first_dev;
189         rtnl_lock();
190
191         /* bring loopback device up first */
192         if (dev_change_flags(&loopback_dev, loopback_dev.flags | IFF_UP) < 0)
193                 printk(KERN_ERR "IP-Config: Failed to open %s\n", loopback_dev.name);
194
195         for (dev = dev_base; dev; dev = dev->next) {
196                 if (dev == &loopback_dev)
197                         continue;
198                 if (user_dev_name[0] ? !strcmp(dev->name, user_dev_name) :
199                     (!(dev->flags & IFF_LOOPBACK) &&
200                      (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) &&
201                      strncmp(dev->name, "dummy", 5))) {
202                         int able = 0;
203                         if (dev->mtu >= 364)
204                                 able |= IC_BOOTP;
205                         else
206                                 printk(KERN_WARNING "DHCP/BOOTP: Ignoring device %s, MTU %d too small", dev->name, dev->mtu);
207                         if (!(dev->flags & IFF_NOARP))
208                                 able |= IC_RARP;
209                         able &= ic_proto_enabled;
210                         if (ic_proto_enabled && !able)
211                                 continue;
212                         oflags = dev->flags;
213                         if (dev_change_flags(dev, oflags | IFF_UP) < 0) {
214                                 printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name);
215                                 continue;
216                         }
217                         if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) {
218                                 rtnl_unlock();
219                                 return -1;
220                         }
221                         d->dev = dev;
222                         *last = d;
223                         last = &d->next;
224                         d->flags = oflags;
225                         d->able = able;
226                         if (able & IC_BOOTP)
227                                 get_random_bytes(&d->xid, sizeof(__be32));
228                         else
229                                 d->xid = 0;
230                         ic_proto_have_if |= able;
231                         DBG(("IP-Config: %s UP (able=%d, xid=%08x)\n",
232                                 dev->name, able, d->xid));
233                 }
234         }
235         rtnl_unlock();
236
237         *last = NULL;
238
239         if (!ic_first_dev) {
240                 if (user_dev_name[0])
241                         printk(KERN_ERR "IP-Config: Device `%s' not found.\n", user_dev_name);
242                 else
243                         printk(KERN_ERR "IP-Config: No network devices available.\n");
244                 return -1;
245         }
246         return 0;
247 }
248
249 static void __init ic_close_devs(void)
250 {
251         struct ic_device *d, *next;
252         struct net_device *dev;
253
254         rtnl_lock();
255         next = ic_first_dev;
256         while ((d = next)) {
257                 next = d->next;
258                 dev = d->dev;
259                 if (dev != ic_dev) {
260                         DBG(("IP-Config: Downing %s\n", dev->name));
261                         dev_change_flags(dev, d->flags);
262                 }
263                 kfree(d);
264         }
265         rtnl_unlock();
266 }
267
268 /*
269  *      Interface to various network functions.
270  */
271
272 static inline void
273 set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port)
274 {
275         sin->sin_family = AF_INET;
276         sin->sin_addr.s_addr = addr;
277         sin->sin_port = port;
278 }
279
280 static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg)
281 {
282         int res;
283
284         mm_segment_t oldfs = get_fs();
285         set_fs(get_ds());
286         res = devinet_ioctl(cmd, (struct ifreq __user *) arg);
287         set_fs(oldfs);
288         return res;
289 }
290
291 static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg)
292 {
293         int res;
294
295         mm_segment_t oldfs = get_fs();
296         set_fs(get_ds());
297         res = ip_rt_ioctl(cmd, (void __user *) arg);
298         set_fs(oldfs);
299         return res;
300 }
301
302 /*
303  *      Set up interface addresses and routes.
304  */
305
306 static int __init ic_setup_if(void)
307 {
308         struct ifreq ir;
309         struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr;
310         int err;
311
312         memset(&ir, 0, sizeof(ir));
313         strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name);
314         set_sockaddr(sin, ic_myaddr, 0);
315         if ((err = ic_dev_ioctl(SIOCSIFADDR, &ir)) < 0) {
316                 printk(KERN_ERR "IP-Config: Unable to set interface address (%d).\n", err);
317                 return -1;
318         }
319         set_sockaddr(sin, ic_netmask, 0);
320         if ((err = ic_dev_ioctl(SIOCSIFNETMASK, &ir)) < 0) {
321                 printk(KERN_ERR "IP-Config: Unable to set interface netmask (%d).\n", err);
322                 return -1;
323         }
324         set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0);
325         if ((err = ic_dev_ioctl(SIOCSIFBRDADDR, &ir)) < 0) {
326                 printk(KERN_ERR "IP-Config: Unable to set interface broadcast address (%d).\n", err);
327                 return -1;
328         }
329         return 0;
330 }
331
332 static int __init ic_setup_routes(void)
333 {
334         /* No need to setup device routes, only the default route... */
335
336         if (ic_gateway != NONE) {
337                 struct rtentry rm;
338                 int err;
339
340                 memset(&rm, 0, sizeof(rm));
341                 if ((ic_gateway ^ ic_myaddr) & ic_netmask) {
342                         printk(KERN_ERR "IP-Config: Gateway not on directly connected network.\n");
343                         return -1;
344                 }
345                 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0);
346                 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0);
347                 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0);
348                 rm.rt_flags = RTF_UP | RTF_GATEWAY;
349                 if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) {
350                         printk(KERN_ERR "IP-Config: Cannot add default route (%d).\n", err);
351                         return -1;
352                 }
353         }
354
355         return 0;
356 }
357
358 /*
359  *      Fill in default values for all missing parameters.
360  */
361
362 static int __init ic_defaults(void)
363 {
364         /*
365          *      At this point we have no userspace running so need not
366          *      claim locks on system_utsname
367          */
368          
369         if (!ic_host_name_set)
370                 sprintf(init_utsname()->nodename, "%u.%u.%u.%u", NIPQUAD(ic_myaddr));
371
372         if (root_server_addr == NONE)
373                 root_server_addr = ic_servaddr;
374
375         if (ic_netmask == NONE) {
376                 if (IN_CLASSA(ntohl(ic_myaddr)))
377                         ic_netmask = htonl(IN_CLASSA_NET);
378                 else if (IN_CLASSB(ntohl(ic_myaddr)))
379                         ic_netmask = htonl(IN_CLASSB_NET);
380                 else if (IN_CLASSC(ntohl(ic_myaddr)))
381                         ic_netmask = htonl(IN_CLASSC_NET);
382                 else {
383                         printk(KERN_ERR "IP-Config: Unable to guess netmask for address %u.%u.%u.%u\n",
384                                 NIPQUAD(ic_myaddr));
385                         return -1;
386                 }
387                 printk("IP-Config: Guessing netmask %u.%u.%u.%u\n", NIPQUAD(ic_netmask));
388         }
389
390         return 0;
391 }
392
393 /*
394  *      RARP support.
395  */
396
397 #ifdef IPCONFIG_RARP
398
399 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
400
401 static struct packet_type rarp_packet_type __initdata = {
402         .type = __constant_htons(ETH_P_RARP),
403         .func = ic_rarp_recv,
404 };
405
406 static inline void ic_rarp_init(void)
407 {
408         dev_add_pack(&rarp_packet_type);
409 }
410
411 static inline void ic_rarp_cleanup(void)
412 {
413         dev_remove_pack(&rarp_packet_type);
414 }
415
416 /*
417  *  Process received RARP packet.
418  */
419 static int __init
420 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
421 {
422         struct arphdr *rarp;
423         unsigned char *rarp_ptr;
424         __be32 sip, tip;
425         unsigned char *sha, *tha;               /* s for "source", t for "target" */
426         struct ic_device *d;
427
428         if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
429                 return NET_RX_DROP;
430
431         if (!pskb_may_pull(skb, sizeof(struct arphdr)))
432                 goto drop;
433
434         /* Basic sanity checks can be done without the lock.  */
435         rarp = (struct arphdr *)skb->h.raw;
436
437         /* If this test doesn't pass, it's not IP, or we should
438          * ignore it anyway.
439          */
440         if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd))
441                 goto drop;
442
443         /* If it's not a RARP reply, delete it. */
444         if (rarp->ar_op != htons(ARPOP_RREPLY))
445                 goto drop;
446
447         /* If it's not Ethernet, delete it. */
448         if (rarp->ar_pro != htons(ETH_P_IP))
449                 goto drop;
450
451         if (!pskb_may_pull(skb,
452                            sizeof(struct arphdr) +
453                            (2 * dev->addr_len) +
454                            (2 * 4)))
455                 goto drop;
456
457         /* OK, it is all there and looks valid, process... */
458         rarp = (struct arphdr *)skb->h.raw;
459         rarp_ptr = (unsigned char *) (rarp + 1);
460
461         /* One reply at a time, please. */
462         spin_lock(&ic_recv_lock);
463
464         /* If we already have a reply, just drop the packet */
465         if (ic_got_reply)
466                 goto drop_unlock;
467
468         /* Find the ic_device that the packet arrived on */
469         d = ic_first_dev;
470         while (d && d->dev != dev)
471                 d = d->next;
472         if (!d)
473                 goto drop_unlock;       /* should never happen */
474
475         /* Extract variable-width fields */
476         sha = rarp_ptr;
477         rarp_ptr += dev->addr_len;
478         memcpy(&sip, rarp_ptr, 4);
479         rarp_ptr += 4;
480         tha = rarp_ptr;
481         rarp_ptr += dev->addr_len;
482         memcpy(&tip, rarp_ptr, 4);
483
484         /* Discard packets which are not meant for us. */
485         if (memcmp(tha, dev->dev_addr, dev->addr_len))
486                 goto drop_unlock;
487
488         /* Discard packets which are not from specified server. */
489         if (ic_servaddr != NONE && ic_servaddr != sip)
490                 goto drop_unlock;
491
492         /* We have a winner! */
493         ic_dev = dev;
494         if (ic_myaddr == NONE)
495                 ic_myaddr = tip;
496         ic_servaddr = sip;
497         ic_got_reply = IC_RARP;
498
499 drop_unlock:
500         /* Show's over.  Nothing to see here.  */
501         spin_unlock(&ic_recv_lock);
502
503 drop:
504         /* Throw the packet out. */
505         kfree_skb(skb);
506         return 0;
507 }
508
509
510 /*
511  *  Send RARP request packet over a single interface.
512  */
513 static void __init ic_rarp_send_if(struct ic_device *d)
514 {
515         struct net_device *dev = d->dev;
516         arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL,
517                  dev->dev_addr, dev->dev_addr);
518 }
519 #endif
520
521 /*
522  *      DHCP/BOOTP support.
523  */
524
525 #ifdef IPCONFIG_BOOTP
526
527 struct bootp_pkt {              /* BOOTP packet format */
528         struct iphdr iph;       /* IP header */
529         struct udphdr udph;     /* UDP header */
530         u8 op;                  /* 1=request, 2=reply */
531         u8 htype;               /* HW address type */
532         u8 hlen;                /* HW address length */
533         u8 hops;                /* Used only by gateways */
534         __be32 xid;             /* Transaction ID */
535         __be16 secs;            /* Seconds since we started */
536         __be16 flags;           /* Just what it says */
537         __be32 client_ip;               /* Client's IP address if known */
538         __be32 your_ip;         /* Assigned IP address */
539         __be32 server_ip;               /* (Next, e.g. NFS) Server's IP address */
540         __be32 relay_ip;                /* IP address of BOOTP relay */
541         u8 hw_addr[16];         /* Client's HW address */
542         u8 serv_name[64];       /* Server host name */
543         u8 boot_file[128];      /* Name of boot file */
544         u8 exten[312];          /* DHCP options / BOOTP vendor extensions */
545 };
546
547 /* packet ops */
548 #define BOOTP_REQUEST   1
549 #define BOOTP_REPLY     2
550
551 /* DHCP message types */
552 #define DHCPDISCOVER    1
553 #define DHCPOFFER       2
554 #define DHCPREQUEST     3
555 #define DHCPDECLINE     4
556 #define DHCPACK         5
557 #define DHCPNAK         6
558 #define DHCPRELEASE     7
559 #define DHCPINFORM      8
560
561 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
562
563 static struct packet_type bootp_packet_type __initdata = {
564         .type = __constant_htons(ETH_P_IP),
565         .func = ic_bootp_recv,
566 };
567
568
569 /*
570  *  Initialize DHCP/BOOTP extension fields in the request.
571  */
572
573 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 };
574
575 #ifdef IPCONFIG_DHCP
576
577 static void __init
578 ic_dhcp_init_options(u8 *options)
579 {
580         u8 mt = ((ic_servaddr == NONE)
581                  ? DHCPDISCOVER : DHCPREQUEST);
582         u8 *e = options;
583
584 #ifdef IPCONFIG_DEBUG
585         printk("DHCP: Sending message type %d\n", mt);
586 #endif
587
588         memcpy(e, ic_bootp_cookie, 4);  /* RFC1048 Magic Cookie */
589         e += 4;
590
591         *e++ = 53;              /* DHCP message type */
592         *e++ = 1;
593         *e++ = mt;
594
595         if (mt == DHCPREQUEST) {
596                 *e++ = 54;      /* Server ID (IP address) */
597                 *e++ = 4;
598                 memcpy(e, &ic_servaddr, 4);
599                 e += 4;
600
601                 *e++ = 50;      /* Requested IP address */
602                 *e++ = 4;
603                 memcpy(e, &ic_myaddr, 4);
604                 e += 4;
605         }
606
607         /* always? */
608         {
609                 static const u8 ic_req_params[] = {
610                         1,      /* Subnet mask */
611                         3,      /* Default gateway */
612                         6,      /* DNS server */
613                         12,     /* Host name */
614                         15,     /* Domain name */
615                         17,     /* Boot path */
616                         40,     /* NIS domain name */
617                 };
618
619                 *e++ = 55;      /* Parameter request list */
620                 *e++ = sizeof(ic_req_params);
621                 memcpy(e, ic_req_params, sizeof(ic_req_params));
622                 e += sizeof(ic_req_params);
623         }
624
625         *e++ = 255;     /* End of the list */
626 }
627
628 #endif /* IPCONFIG_DHCP */
629
630 static void __init ic_bootp_init_ext(u8 *e)
631 {
632         memcpy(e, ic_bootp_cookie, 4);  /* RFC1048 Magic Cookie */
633         e += 4;
634         *e++ = 1;               /* Subnet mask request */
635         *e++ = 4;
636         e += 4;
637         *e++ = 3;               /* Default gateway request */
638         *e++ = 4;
639         e += 4;
640         *e++ = 5;               /* Name server request */
641         *e++ = 8;
642         e += 8;
643         *e++ = 12;              /* Host name request */
644         *e++ = 32;
645         e += 32;
646         *e++ = 40;              /* NIS Domain name request */
647         *e++ = 32;
648         e += 32;
649         *e++ = 17;              /* Boot path */
650         *e++ = 40;
651         e += 40;
652
653         *e++ = 57;              /* set extension buffer size for reply */ 
654         *e++ = 2;
655         *e++ = 1;               /* 128+236+8+20+14, see dhcpd sources */ 
656         *e++ = 150;
657
658         *e++ = 255;             /* End of the list */
659 }
660
661
662 /*
663  *  Initialize the DHCP/BOOTP mechanism.
664  */
665 static inline void ic_bootp_init(void)
666 {
667         int i;
668
669         for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
670                 ic_nameservers[i] = NONE;
671
672         dev_add_pack(&bootp_packet_type);
673 }
674
675
676 /*
677  *  DHCP/BOOTP cleanup.
678  */
679 static inline void ic_bootp_cleanup(void)
680 {
681         dev_remove_pack(&bootp_packet_type);
682 }
683
684
685 /*
686  *  Send DHCP/BOOTP request to single interface.
687  */
688 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff)
689 {
690         struct net_device *dev = d->dev;
691         struct sk_buff *skb;
692         struct bootp_pkt *b;
693         int hh_len = LL_RESERVED_SPACE(dev);
694         struct iphdr *h;
695
696         /* Allocate packet */
697         skb = alloc_skb(sizeof(struct bootp_pkt) + hh_len + 15, GFP_KERNEL);
698         if (!skb)
699                 return;
700         skb_reserve(skb, hh_len);
701         b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt));
702         memset(b, 0, sizeof(struct bootp_pkt));
703
704         /* Construct IP header */
705         skb->nh.iph = h = &b->iph;
706         h->version = 4;
707         h->ihl = 5;
708         h->tot_len = htons(sizeof(struct bootp_pkt));
709         h->frag_off = htons(IP_DF);
710         h->ttl = 64;
711         h->protocol = IPPROTO_UDP;
712         h->daddr = htonl(INADDR_BROADCAST);
713         h->check = ip_fast_csum((unsigned char *) h, h->ihl);
714
715         /* Construct UDP header */
716         b->udph.source = htons(68);
717         b->udph.dest = htons(67);
718         b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr));
719         /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */
720
721         /* Construct DHCP/BOOTP header */
722         b->op = BOOTP_REQUEST;
723         if (dev->type < 256) /* check for false types */
724                 b->htype = dev->type;
725         else if (dev->type == ARPHRD_IEEE802_TR) /* fix for token ring */
726                 b->htype = ARPHRD_IEEE802;
727         else if (dev->type == ARPHRD_FDDI)
728                 b->htype = ARPHRD_ETHER;
729         else {
730                 printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name);
731                 b->htype = dev->type; /* can cause undefined behavior */
732         }
733         b->hlen = dev->addr_len;
734         b->your_ip = NONE;
735         b->server_ip = NONE;
736         memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
737         b->secs = htons(jiffies_diff / HZ);
738         b->xid = d->xid;
739
740         /* add DHCP options or BOOTP extensions */
741 #ifdef IPCONFIG_DHCP
742         if (ic_proto_enabled & IC_USE_DHCP)
743                 ic_dhcp_init_options(b->exten);
744         else
745 #endif
746                 ic_bootp_init_ext(b->exten);
747
748         /* Chain packet down the line... */
749         skb->dev = dev;
750         skb->protocol = htons(ETH_P_IP);
751         if ((dev->hard_header &&
752              dev->hard_header(skb, dev, ntohs(skb->protocol), dev->broadcast, dev->dev_addr, skb->len) < 0) ||
753             dev_queue_xmit(skb) < 0)
754                 printk("E");
755 }
756
757
758 /*
759  *  Copy BOOTP-supplied string if not already set.
760  */
761 static int __init ic_bootp_string(char *dest, char *src, int len, int max)
762 {
763         if (!len)
764                 return 0;
765         if (len > max-1)
766                 len = max-1;
767         memcpy(dest, src, len);
768         dest[len] = '\0';
769         return 1;
770 }
771
772
773 /*
774  *  Process BOOTP extensions.
775  */
776 static void __init ic_do_bootp_ext(u8 *ext)
777 {
778        u8 servers;
779        int i;
780
781 #ifdef IPCONFIG_DEBUG
782         u8 *c;
783
784         printk("DHCP/BOOTP: Got extension %d:",*ext);
785         for(c=ext+2; c<ext+2+ext[1]; c++)
786                 printk(" %02x", *c);
787         printk("\n");
788 #endif
789
790         switch (*ext++) {
791                 case 1:         /* Subnet mask */
792                         if (ic_netmask == NONE)
793                                 memcpy(&ic_netmask, ext+1, 4);
794                         break;
795                 case 3:         /* Default gateway */
796                         if (ic_gateway == NONE)
797                                 memcpy(&ic_gateway, ext+1, 4);
798                         break;
799                 case 6:         /* DNS server */
800                         servers= *ext/4;
801                         if (servers > CONF_NAMESERVERS_MAX)
802                                 servers = CONF_NAMESERVERS_MAX;
803                         for (i = 0; i < servers; i++) {
804                                 if (ic_nameservers[i] == NONE)
805                                         memcpy(&ic_nameservers[i], ext+1+4*i, 4);
806                         }
807                         break;
808                 case 12:        /* Host name */
809                         ic_bootp_string(utsname()->nodename, ext+1, *ext, __NEW_UTS_LEN);
810                         ic_host_name_set = 1;
811                         break;
812                 case 15:        /* Domain name (DNS) */
813                         ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
814                         break;
815                 case 17:        /* Root path */
816                         if (!root_server_path[0])
817                                 ic_bootp_string(root_server_path, ext+1, *ext, sizeof(root_server_path));
818                         break;
819                 case 40:        /* NIS Domain name (_not_ DNS) */
820                         ic_bootp_string(utsname()->domainname, ext+1, *ext, __NEW_UTS_LEN);
821                         break;
822         }
823 }
824
825
826 /*
827  *  Receive BOOTP reply.
828  */
829 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
830 {
831         struct bootp_pkt *b;
832         struct iphdr *h;
833         struct ic_device *d;
834         int len, ext_len;
835
836         /* Perform verifications before taking the lock.  */
837         if (skb->pkt_type == PACKET_OTHERHOST)
838                 goto drop;
839
840         if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
841                 return NET_RX_DROP;
842
843         if (!pskb_may_pull(skb,
844                            sizeof(struct iphdr) +
845                            sizeof(struct udphdr)))
846                 goto drop;
847
848         b = (struct bootp_pkt *) skb->nh.iph;
849         h = &b->iph;
850
851         if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP)
852                 goto drop;
853
854         /* Fragments are not supported */
855         if (h->frag_off & htons(IP_OFFSET | IP_MF)) {
856                 if (net_ratelimit())
857                         printk(KERN_ERR "DHCP/BOOTP: Ignoring fragmented "
858                                "reply.\n");
859                 goto drop;
860         }
861
862         if (skb->len < ntohs(h->tot_len))
863                 goto drop;
864
865         if (ip_fast_csum((char *) h, h->ihl))
866                 goto drop;
867
868         if (b->udph.source != htons(67) || b->udph.dest != htons(68))
869                 goto drop;
870
871         if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
872                 goto drop;
873
874         len = ntohs(b->udph.len) - sizeof(struct udphdr);
875         ext_len = len - (sizeof(*b) -
876                          sizeof(struct iphdr) -
877                          sizeof(struct udphdr) -
878                          sizeof(b->exten));
879         if (ext_len < 0)
880                 goto drop;
881
882         /* Ok the front looks good, make sure we can get at the rest.  */
883         if (!pskb_may_pull(skb, skb->len))
884                 goto drop;
885
886         b = (struct bootp_pkt *) skb->nh.iph;
887         h = &b->iph;
888
889         /* One reply at a time, please. */
890         spin_lock(&ic_recv_lock);
891
892         /* If we already have a reply, just drop the packet */
893         if (ic_got_reply)
894                 goto drop_unlock;
895
896         /* Find the ic_device that the packet arrived on */
897         d = ic_first_dev;
898         while (d && d->dev != dev)
899                 d = d->next;
900         if (!d)
901                 goto drop_unlock;  /* should never happen */
902
903         /* Is it a reply to our BOOTP request? */
904         if (b->op != BOOTP_REPLY ||
905             b->xid != d->xid) {
906                 if (net_ratelimit())
907                         printk(KERN_ERR "DHCP/BOOTP: Reply not for us, "
908                                "op[%x] xid[%x]\n",
909                                b->op, b->xid);
910                 goto drop_unlock;
911         }
912
913         /* Parse extensions */
914         if (ext_len >= 4 &&
915             !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */
916                 u8 *end = (u8 *) b + ntohs(b->iph.tot_len);
917                 u8 *ext;
918
919 #ifdef IPCONFIG_DHCP
920                 if (ic_proto_enabled & IC_USE_DHCP) {
921                         __be32 server_id = NONE;
922                         int mt = 0;
923
924                         ext = &b->exten[4];
925                         while (ext < end && *ext != 0xff) {
926                                 u8 *opt = ext++;
927                                 if (*opt == 0)  /* Padding */
928                                         continue;
929                                 ext += *ext + 1;
930                                 if (ext >= end)
931                                         break;
932                                 switch (*opt) {
933                                 case 53:        /* Message type */
934                                         if (opt[1])
935                                                 mt = opt[2];
936                                         break;
937                                 case 54:        /* Server ID (IP address) */
938                                         if (opt[1] >= 4)
939                                                 memcpy(&server_id, opt + 2, 4);
940                                         break;
941                                 };
942                         }
943
944 #ifdef IPCONFIG_DEBUG
945                         printk("DHCP: Got message type %d\n", mt);
946 #endif
947
948                         switch (mt) {
949                         case DHCPOFFER:
950                                 /* While in the process of accepting one offer,
951                                  * ignore all others.
952                                  */
953                                 if (ic_myaddr != NONE)
954                                         goto drop_unlock;
955
956                                 /* Let's accept that offer. */
957                                 ic_myaddr = b->your_ip;
958                                 ic_servaddr = server_id;
959 #ifdef IPCONFIG_DEBUG
960                                 printk("DHCP: Offered address %u.%u.%u.%u",
961                                        NIPQUAD(ic_myaddr));
962                                 printk(" by server %u.%u.%u.%u\n",
963                                        NIPQUAD(ic_servaddr));
964 #endif
965                                 /* The DHCP indicated server address takes
966                                  * precedence over the bootp header one if
967                                  * they are different.
968                                  */
969                                 if ((server_id != NONE) &&
970                                     (b->server_ip != server_id))
971                                         b->server_ip = ic_servaddr;
972                                 break;
973
974                         case DHCPACK:
975                                 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0)
976                                         goto drop_unlock;
977
978                                 /* Yeah! */
979                                 break;
980
981                         default:
982                                 /* Urque.  Forget it*/
983                                 ic_myaddr = NONE;
984                                 ic_servaddr = NONE;
985                                 goto drop_unlock;
986                         };
987
988                         ic_dhcp_msgtype = mt;
989
990                 }
991 #endif /* IPCONFIG_DHCP */
992
993                 ext = &b->exten[4];
994                 while (ext < end && *ext != 0xff) {
995                         u8 *opt = ext++;
996                         if (*opt == 0)  /* Padding */
997                                 continue;
998                         ext += *ext + 1;
999                         if (ext < end)
1000                                 ic_do_bootp_ext(opt);
1001                 }
1002         }
1003
1004         /* We have a winner! */
1005         ic_dev = dev;
1006         ic_myaddr = b->your_ip;
1007         ic_servaddr = b->server_ip;
1008         if (ic_gateway == NONE && b->relay_ip)
1009                 ic_gateway = b->relay_ip;
1010         if (ic_nameservers[0] == NONE)
1011                 ic_nameservers[0] = ic_servaddr;
1012         ic_got_reply = IC_BOOTP;
1013
1014 drop_unlock:
1015         /* Show's over.  Nothing to see here.  */
1016         spin_unlock(&ic_recv_lock);
1017
1018 drop:
1019         /* Throw the packet out. */
1020         kfree_skb(skb);
1021
1022         return 0;
1023 }       
1024
1025
1026 #endif
1027
1028
1029 /*
1030  *      Dynamic IP configuration -- DHCP, BOOTP, RARP.
1031  */
1032
1033 #ifdef IPCONFIG_DYNAMIC
1034
1035 static int __init ic_dynamic(void)
1036 {
1037         int retries;
1038         struct ic_device *d;
1039         unsigned long start_jiffies, timeout, jiff;
1040         int do_bootp = ic_proto_have_if & IC_BOOTP;
1041         int do_rarp = ic_proto_have_if & IC_RARP;
1042
1043         /*
1044          * If none of DHCP/BOOTP/RARP was selected, return with an error.
1045          * This routine gets only called when some pieces of information
1046          * are missing, and without DHCP/BOOTP/RARP we are unable to get it.
1047          */
1048         if (!ic_proto_enabled) {
1049                 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
1050                 return -1;
1051         }
1052
1053 #ifdef IPCONFIG_BOOTP
1054         if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
1055                 printk(KERN_ERR "DHCP/BOOTP: No suitable device found.\n");
1056 #endif
1057 #ifdef IPCONFIG_RARP
1058         if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)
1059                 printk(KERN_ERR "RARP: No suitable device found.\n");
1060 #endif
1061
1062         if (!ic_proto_have_if)
1063                 /* Error message already printed */
1064                 return -1;
1065
1066         /*
1067          * Setup protocols
1068          */
1069 #ifdef IPCONFIG_BOOTP
1070         if (do_bootp)
1071                 ic_bootp_init();
1072 #endif
1073 #ifdef IPCONFIG_RARP
1074         if (do_rarp)
1075                 ic_rarp_init();
1076 #endif
1077
1078         /*
1079          * Send requests and wait, until we get an answer. This loop
1080          * seems to be a terrible waste of CPU time, but actually there is
1081          * only one process running at all, so we don't need to use any
1082          * scheduler functions.
1083          * [Actually we could now, but the nothing else running note still 
1084          *  applies.. - AC]
1085          */
1086         printk(KERN_NOTICE "Sending %s%s%s requests .",
1087                do_bootp
1088                 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "",
1089                (do_bootp && do_rarp) ? " and " : "",
1090                do_rarp ? "RARP" : "");
1091
1092         start_jiffies = jiffies;
1093         d = ic_first_dev;
1094         retries = CONF_SEND_RETRIES;
1095         get_random_bytes(&timeout, sizeof(timeout));
1096         timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned) CONF_TIMEOUT_RANDOM);
1097         for(;;) {
1098 #ifdef IPCONFIG_BOOTP
1099                 if (do_bootp && (d->able & IC_BOOTP))
1100                         ic_bootp_send_if(d, jiffies - start_jiffies);
1101 #endif
1102 #ifdef IPCONFIG_RARP
1103                 if (do_rarp && (d->able & IC_RARP))
1104                         ic_rarp_send_if(d);
1105 #endif
1106
1107                 jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout);
1108                 while (time_before(jiffies, jiff) && !ic_got_reply)
1109                         schedule_timeout_uninterruptible(1);
1110 #ifdef IPCONFIG_DHCP
1111                 /* DHCP isn't done until we get a DHCPACK. */
1112                 if ((ic_got_reply & IC_BOOTP)
1113                     && (ic_proto_enabled & IC_USE_DHCP)
1114                     && ic_dhcp_msgtype != DHCPACK)
1115                 {
1116                         ic_got_reply = 0;
1117                         printk(",");
1118                         continue;
1119                 }
1120 #endif /* IPCONFIG_DHCP */
1121
1122                 if (ic_got_reply) {
1123                         printk(" OK\n");
1124                         break;
1125                 }
1126
1127                 if ((d = d->next))
1128                         continue;
1129
1130                 if (! --retries) {
1131                         printk(" timed out!\n");
1132                         break;
1133                 }
1134
1135                 d = ic_first_dev;
1136
1137                 timeout = timeout CONF_TIMEOUT_MULT;
1138                 if (timeout > CONF_TIMEOUT_MAX)
1139                         timeout = CONF_TIMEOUT_MAX;
1140
1141                 printk(".");
1142         }
1143
1144 #ifdef IPCONFIG_BOOTP
1145         if (do_bootp)
1146                 ic_bootp_cleanup();
1147 #endif
1148 #ifdef IPCONFIG_RARP
1149         if (do_rarp)
1150                 ic_rarp_cleanup();
1151 #endif
1152
1153         if (!ic_got_reply) {
1154                 ic_myaddr = NONE;
1155                 return -1;
1156         }
1157
1158         printk("IP-Config: Got %s answer from %u.%u.%u.%u, ",
1159                 ((ic_got_reply & IC_RARP) ? "RARP" 
1160                  : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),
1161                 NIPQUAD(ic_servaddr));
1162         printk("my address is %u.%u.%u.%u\n", NIPQUAD(ic_myaddr));
1163
1164         return 0;
1165 }
1166
1167 #endif /* IPCONFIG_DYNAMIC */
1168
1169 #ifdef CONFIG_PROC_FS
1170
1171 static int pnp_seq_show(struct seq_file *seq, void *v)
1172 {
1173         int i;
1174
1175         if (ic_proto_used & IC_PROTO)
1176                 seq_printf(seq, "#PROTO: %s\n",
1177                            (ic_proto_used & IC_RARP) ? "RARP"
1178                            : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP");
1179         else
1180                 seq_puts(seq, "#MANUAL\n");
1181
1182         if (ic_domain[0])
1183                 seq_printf(seq,
1184                            "domain %s\n", ic_domain);
1185         for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {
1186                 if (ic_nameservers[i] != NONE)
1187                         seq_printf(seq,
1188                                    "nameserver %u.%u.%u.%u\n",
1189                                    NIPQUAD(ic_nameservers[i]));
1190         }
1191         if (ic_servaddr != NONE)
1192                 seq_printf(seq,
1193                            "bootserver %u.%u.%u.%u\n",
1194                            NIPQUAD(ic_servaddr));
1195         return 0;
1196 }
1197
1198 static int pnp_seq_open(struct inode *indoe, struct file *file)
1199 {
1200         return single_open(file, pnp_seq_show, NULL);
1201 }
1202
1203 static struct file_operations pnp_seq_fops = {
1204         .owner          = THIS_MODULE,
1205         .open           = pnp_seq_open,
1206         .read           = seq_read,
1207         .llseek         = seq_lseek,
1208         .release        = single_release,
1209 };
1210 #endif /* CONFIG_PROC_FS */
1211
1212 /*
1213  *  Extract IP address from the parameter string if needed. Note that we
1214  *  need to have root_server_addr set _before_ IPConfig gets called as it
1215  *  can override it.
1216  */
1217 __be32 __init root_nfs_parse_addr(char *name)
1218 {
1219         __be32 addr;
1220         int octets = 0;
1221         char *cp, *cq;
1222
1223         cp = cq = name;
1224         while (octets < 4) {
1225                 while (*cp >= '0' && *cp <= '9')
1226                         cp++;
1227                 if (cp == cq || cp - cq > 3)
1228                         break;
1229                 if (*cp == '.' || octets == 3)
1230                         octets++;
1231                 if (octets < 4)
1232                         cp++;
1233                 cq = cp;
1234         }
1235         if (octets == 4 && (*cp == ':' || *cp == '\0')) {
1236                 if (*cp == ':')
1237                         *cp++ = '\0';
1238                 addr = in_aton(name);
1239                 memmove(name, cp, strlen(cp) + 1);
1240         } else
1241                 addr = NONE;
1242
1243         return addr;
1244 }
1245
1246 /*
1247  *      IP Autoconfig dispatcher.
1248  */
1249
1250 static int __init ip_auto_config(void)
1251 {
1252         __be32 addr;
1253
1254 #ifdef CONFIG_PROC_FS
1255         proc_net_fops_create("pnp", S_IRUGO, &pnp_seq_fops);
1256 #endif /* CONFIG_PROC_FS */
1257
1258         if (!ic_enable)
1259                 return 0;
1260
1261         DBG(("IP-Config: Entered.\n"));
1262 #ifdef IPCONFIG_DYNAMIC
1263  try_try_again:
1264 #endif
1265         /* Give hardware a chance to settle */
1266         msleep(CONF_PRE_OPEN);
1267
1268         /* Setup all network devices */
1269         if (ic_open_devs() < 0)
1270                 return -1;
1271
1272         /* Give drivers a chance to settle */
1273         ssleep(CONF_POST_OPEN);
1274
1275         /*
1276          * If the config information is insufficient (e.g., our IP address or
1277          * IP address of the boot server is missing or we have multiple network
1278          * interfaces and no default was set), use BOOTP or RARP to get the
1279          * missing values.
1280          */
1281         if (ic_myaddr == NONE ||
1282 #ifdef CONFIG_ROOT_NFS
1283             (MAJOR(ROOT_DEV) == UNNAMED_MAJOR
1284              && root_server_addr == NONE
1285              && ic_servaddr == NONE) ||
1286 #endif
1287             ic_first_dev->next) {
1288 #ifdef IPCONFIG_DYNAMIC
1289         
1290                 int retries = CONF_OPEN_RETRIES;
1291
1292                 if (ic_dynamic() < 0) {
1293                         ic_close_devs();
1294
1295                         /*
1296                          * I don't know why, but sometimes the
1297                          * eepro100 driver (at least) gets upset and
1298                          * doesn't work the first time it's opened.
1299                          * But then if you close it and reopen it, it
1300                          * works just fine.  So we need to try that at
1301                          * least once before giving up.
1302                          *
1303                          * Also, if the root will be NFS-mounted, we
1304                          * have nowhere to go if DHCP fails.  So we
1305                          * just have to keep trying forever.
1306                          *
1307                          *                              -- Chip
1308                          */
1309 #ifdef CONFIG_ROOT_NFS
1310                         if (ROOT_DEV ==  Root_NFS) {
1311                                 printk(KERN_ERR 
1312                                         "IP-Config: Retrying forever (NFS root)...\n");
1313                                 goto try_try_again;
1314                         }
1315 #endif
1316
1317                         if (--retries) {
1318                                 printk(KERN_ERR 
1319                                        "IP-Config: Reopening network devices...\n");
1320                                 goto try_try_again;
1321                         }
1322
1323                         /* Oh, well.  At least we tried. */
1324                         printk(KERN_ERR "IP-Config: Auto-configuration of network failed.\n");
1325                         return -1;
1326                 }
1327 #else /* !DYNAMIC */
1328                 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
1329                 ic_close_devs();
1330                 return -1;
1331 #endif /* IPCONFIG_DYNAMIC */
1332         } else {
1333                 /* Device selected manually or only one device -> use it */
1334                 ic_dev = ic_first_dev->dev;
1335         }
1336
1337         addr = root_nfs_parse_addr(root_server_path);
1338         if (root_server_addr == NONE)
1339                 root_server_addr = addr;
1340
1341         /*
1342          * Use defaults whereever applicable.
1343          */
1344         if (ic_defaults() < 0)
1345                 return -1;
1346
1347         /*
1348          * Close all network devices except the device we've
1349          * autoconfigured and set up routes.
1350          */
1351         ic_close_devs();
1352         if (ic_setup_if() < 0 || ic_setup_routes() < 0)
1353                 return -1;
1354
1355         /*
1356          * Record which protocol was actually used.
1357          */
1358 #ifdef IPCONFIG_DYNAMIC
1359         ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP);
1360 #endif
1361
1362 #ifndef IPCONFIG_SILENT
1363         /*
1364          * Clue in the operator.
1365          */
1366         printk("IP-Config: Complete:");
1367         printk("\n      device=%s", ic_dev->name);
1368         printk(", addr=%u.%u.%u.%u", NIPQUAD(ic_myaddr));
1369         printk(", mask=%u.%u.%u.%u", NIPQUAD(ic_netmask));
1370         printk(", gw=%u.%u.%u.%u", NIPQUAD(ic_gateway));
1371         printk(",\n     host=%s, domain=%s, nis-domain=%s",
1372                utsname()->nodename, ic_domain, utsname()->domainname);
1373         printk(",\n     bootserver=%u.%u.%u.%u", NIPQUAD(ic_servaddr));
1374         printk(", rootserver=%u.%u.%u.%u", NIPQUAD(root_server_addr));
1375         printk(", rootpath=%s", root_server_path);
1376         printk("\n");
1377 #endif /* !SILENT */
1378
1379         return 0;
1380 }
1381
1382 late_initcall(ip_auto_config);
1383
1384
1385 /*
1386  *  Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
1387  *  command line parameter. It consists of option fields separated by colons in
1388  *  the following order:
1389  *
1390  *  <client-ip>:<server-ip>:<gw-ip>:<netmask>:<host name>:<device>:<PROTO>
1391  *
1392  *  Any of the fields can be empty which means to use a default value:
1393  *      <client-ip>     - address given by BOOTP or RARP
1394  *      <server-ip>     - address of host returning BOOTP or RARP packet
1395  *      <gw-ip>         - none, or the address returned by BOOTP
1396  *      <netmask>       - automatically determined from <client-ip>, or the
1397  *                        one returned by BOOTP
1398  *      <host name>     - <client-ip> in ASCII notation, or the name returned
1399  *                        by BOOTP
1400  *      <device>        - use all available devices
1401  *      <PROTO>:
1402  *         off|none         - don't do autoconfig at all (DEFAULT)
1403  *         on|any           - use any configured protocol
1404  *         dhcp|bootp|rarp  - use only the specified protocol
1405  *         both             - use both BOOTP and RARP (not DHCP)
1406  */
1407 static int __init ic_proto_name(char *name)
1408 {
1409         if (!strcmp(name, "on") || !strcmp(name, "any")) {
1410                 return 1;
1411         }
1412 #ifdef CONFIG_IP_PNP_DHCP
1413         else if (!strcmp(name, "dhcp")) {
1414                 ic_proto_enabled &= ~IC_RARP;
1415                 return 1;
1416         }
1417 #endif
1418 #ifdef CONFIG_IP_PNP_BOOTP
1419         else if (!strcmp(name, "bootp")) {
1420                 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP);
1421                 return 1;
1422         }
1423 #endif
1424 #ifdef CONFIG_IP_PNP_RARP
1425         else if (!strcmp(name, "rarp")) {
1426                 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP);
1427                 return 1;
1428         }
1429 #endif
1430 #ifdef IPCONFIG_DYNAMIC
1431         else if (!strcmp(name, "both")) {
1432                 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */
1433                 return 1;
1434         }
1435 #endif
1436         return 0;
1437 }
1438
1439 static int __init ip_auto_config_setup(char *addrs)
1440 {
1441         char *cp, *ip, *dp;
1442         int num = 0;
1443
1444         ic_set_manually = 1;
1445
1446         ic_enable = (*addrs && 
1447                 (strcmp(addrs, "off") != 0) && 
1448                 (strcmp(addrs, "none") != 0));
1449         if (!ic_enable)
1450                 return 1;
1451
1452         if (ic_proto_name(addrs))
1453                 return 1;
1454
1455         /* Parse the whole string */
1456         ip = addrs;
1457         while (ip && *ip) {
1458                 if ((cp = strchr(ip, ':')))
1459                         *cp++ = '\0';
1460                 if (strlen(ip) > 0) {
1461                         DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip));
1462                         switch (num) {
1463                         case 0:
1464                                 if ((ic_myaddr = in_aton(ip)) == INADDR_ANY)
1465                                         ic_myaddr = NONE;
1466                                 break;
1467                         case 1:
1468                                 if ((ic_servaddr = in_aton(ip)) == INADDR_ANY)
1469                                         ic_servaddr = NONE;
1470                                 break;
1471                         case 2:
1472                                 if ((ic_gateway = in_aton(ip)) == INADDR_ANY)
1473                                         ic_gateway = NONE;
1474                                 break;
1475                         case 3:
1476                                 if ((ic_netmask = in_aton(ip)) == INADDR_ANY)
1477                                         ic_netmask = NONE;
1478                                 break;
1479                         case 4:
1480                                 if ((dp = strchr(ip, '.'))) {
1481                                         *dp++ = '\0';
1482                                         strlcpy(utsname()->domainname, dp,
1483                                                 sizeof(utsname()->domainname));
1484                                 }
1485                                 strlcpy(utsname()->nodename, ip,
1486                                         sizeof(utsname()->nodename));
1487                                 ic_host_name_set = 1;
1488                                 break;
1489                         case 5:
1490                                 strlcpy(user_dev_name, ip, sizeof(user_dev_name));
1491                                 break;
1492                         case 6:
1493                                 ic_proto_name(ip);
1494                                 break;
1495                         }
1496                 }
1497                 ip = cp;
1498                 num++;
1499         }
1500
1501         return 1;
1502 }
1503
1504 static int __init nfsaddrs_config_setup(char *addrs)
1505 {
1506         return ip_auto_config_setup(addrs);
1507 }
1508
1509 __setup("ip=", ip_auto_config_setup);
1510 __setup("nfsaddrs=", nfsaddrs_config_setup);