[IPCONFIG]: The kernel gets no IP from some DHCP servers
[sfrench/cifs-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/net_namespace.h>
59 #include <net/arp.h>
60 #include <net/ip.h>
61 #include <net/ipconfig.h>
62 #include <net/route.h>
63
64 #include <asm/uaccess.h>
65 #include <net/checksum.h>
66 #include <asm/processor.h>
67
68 /* Define this to allow debugging output */
69 #undef IPCONFIG_DEBUG
70
71 #ifdef IPCONFIG_DEBUG
72 #define DBG(x) printk x
73 #else
74 #define DBG(x) do { } while(0)
75 #endif
76
77 #if defined(CONFIG_IP_PNP_DHCP)
78 #define IPCONFIG_DHCP
79 #endif
80 #if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_DHCP)
81 #define IPCONFIG_BOOTP
82 #endif
83 #if defined(CONFIG_IP_PNP_RARP)
84 #define IPCONFIG_RARP
85 #endif
86 #if defined(IPCONFIG_BOOTP) || defined(IPCONFIG_RARP)
87 #define IPCONFIG_DYNAMIC
88 #endif
89
90 /* Define the friendly delay before and after opening net devices */
91 #define CONF_PRE_OPEN           500     /* Before opening: 1/2 second */
92 #define CONF_POST_OPEN          1       /* After opening: 1 second */
93
94 /* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */
95 #define CONF_OPEN_RETRIES       2       /* (Re)open devices twice */
96 #define CONF_SEND_RETRIES       6       /* Send six requests per open */
97 #define CONF_INTER_TIMEOUT      (HZ/2)  /* Inter-device timeout: 1/2 second */
98 #define CONF_BASE_TIMEOUT       (HZ*2)  /* Initial timeout: 2 seconds */
99 #define CONF_TIMEOUT_RANDOM     (HZ)    /* Maximum amount of randomization */
100 #define CONF_TIMEOUT_MULT       *7/4    /* Rate of timeout growth */
101 #define CONF_TIMEOUT_MAX        (HZ*30) /* Maximum allowed timeout */
102 #define CONF_NAMESERVERS_MAX   3       /* Maximum number of nameservers
103                                            - '3' from resolv.h */
104
105 #define NONE __constant_htonl(INADDR_NONE)
106
107 /*
108  * Public IP configuration
109  */
110
111 /* This is used by platforms which might be able to set the ipconfig
112  * variables using firmware environment vars.  If this is set, it will
113  * ignore such firmware variables.
114  */
115 int ic_set_manually __initdata = 0;             /* IPconfig parameters set manually */
116
117 static int ic_enable __initdata = 0;            /* IP config enabled? */
118
119 /* Protocol choice */
120 int ic_proto_enabled __initdata = 0
121 #ifdef IPCONFIG_BOOTP
122                         | IC_BOOTP
123 #endif
124 #ifdef CONFIG_IP_PNP_DHCP
125                         | IC_USE_DHCP
126 #endif
127 #ifdef IPCONFIG_RARP
128                         | IC_RARP
129 #endif
130                         ;
131
132 static int ic_host_name_set __initdata = 0;     /* Host name set by us? */
133
134 __be32 ic_myaddr = NONE;                /* My IP address */
135 static __be32 ic_netmask = NONE;        /* Netmask for local subnet */
136 __be32 ic_gateway = NONE;       /* Gateway IP address */
137
138 __be32 ic_servaddr = NONE;      /* Boot server IP address */
139
140 __be32 root_server_addr = NONE; /* Address of NFS server */
141 u8 root_server_path[256] = { 0, };      /* Path to mount as root */
142
143 /* vendor class identifier */
144 static char vendor_class_identifier[253] __initdata;
145
146 /* Persistent data: */
147
148 static int ic_proto_used;                       /* Protocol used, if any */
149 static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */
150 static u8 ic_domain[64];                /* DNS (not NIS) domain name */
151
152 /*
153  * Private state.
154  */
155
156 /* Name of user-selected boot device */
157 static char user_dev_name[IFNAMSIZ] __initdata = { 0, };
158
159 /* Protocols supported by available interfaces */
160 static int ic_proto_have_if __initdata = 0;
161
162 #ifdef IPCONFIG_DYNAMIC
163 static DEFINE_SPINLOCK(ic_recv_lock);
164 static volatile int ic_got_reply __initdata = 0;    /* Proto(s) that replied */
165 #endif
166 #ifdef IPCONFIG_DHCP
167 static int ic_dhcp_msgtype __initdata = 0;      /* DHCP msg type received */
168 #endif
169
170
171 /*
172  *      Network devices
173  */
174
175 struct ic_device {
176         struct ic_device *next;
177         struct net_device *dev;
178         unsigned short flags;
179         short able;
180         __be32 xid;
181 };
182
183 static struct ic_device *ic_first_dev __initdata = NULL;/* List of open device */
184 static struct net_device *ic_dev __initdata = NULL;     /* Selected device */
185
186 static int __init ic_open_devs(void)
187 {
188         struct ic_device *d, **last;
189         struct net_device *dev;
190         unsigned short oflags;
191
192         last = &ic_first_dev;
193         rtnl_lock();
194
195         /* bring loopback device up first */
196         for_each_netdev(&init_net, dev) {
197                 if (!(dev->flags & IFF_LOOPBACK))
198                         continue;
199                 if (dev_change_flags(dev, dev->flags | IFF_UP) < 0)
200                         printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name);
201         }
202
203         for_each_netdev(&init_net, dev) {
204                 if (dev->flags & IFF_LOOPBACK)
205                         continue;
206                 if (user_dev_name[0] ? !strcmp(dev->name, user_dev_name) :
207                     (!(dev->flags & IFF_LOOPBACK) &&
208                      (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) &&
209                      strncmp(dev->name, "dummy", 5))) {
210                         int able = 0;
211                         if (dev->mtu >= 364)
212                                 able |= IC_BOOTP;
213                         else
214                                 printk(KERN_WARNING "DHCP/BOOTP: Ignoring device %s, MTU %d too small", dev->name, dev->mtu);
215                         if (!(dev->flags & IFF_NOARP))
216                                 able |= IC_RARP;
217                         able &= ic_proto_enabled;
218                         if (ic_proto_enabled && !able)
219                                 continue;
220                         oflags = dev->flags;
221                         if (dev_change_flags(dev, oflags | IFF_UP) < 0) {
222                                 printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name);
223                                 continue;
224                         }
225                         if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) {
226                                 rtnl_unlock();
227                                 return -1;
228                         }
229                         d->dev = dev;
230                         *last = d;
231                         last = &d->next;
232                         d->flags = oflags;
233                         d->able = able;
234                         if (able & IC_BOOTP)
235                                 get_random_bytes(&d->xid, sizeof(__be32));
236                         else
237                                 d->xid = 0;
238                         ic_proto_have_if |= able;
239                         DBG(("IP-Config: %s UP (able=%d, xid=%08x)\n",
240                                 dev->name, able, d->xid));
241                 }
242         }
243         rtnl_unlock();
244
245         *last = NULL;
246
247         if (!ic_first_dev) {
248                 if (user_dev_name[0])
249                         printk(KERN_ERR "IP-Config: Device `%s' not found.\n", user_dev_name);
250                 else
251                         printk(KERN_ERR "IP-Config: No network devices available.\n");
252                 return -1;
253         }
254         return 0;
255 }
256
257 static void __init ic_close_devs(void)
258 {
259         struct ic_device *d, *next;
260         struct net_device *dev;
261
262         rtnl_lock();
263         next = ic_first_dev;
264         while ((d = next)) {
265                 next = d->next;
266                 dev = d->dev;
267                 if (dev != ic_dev) {
268                         DBG(("IP-Config: Downing %s\n", dev->name));
269                         dev_change_flags(dev, d->flags);
270                 }
271                 kfree(d);
272         }
273         rtnl_unlock();
274 }
275
276 /*
277  *      Interface to various network functions.
278  */
279
280 static inline void
281 set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port)
282 {
283         sin->sin_family = AF_INET;
284         sin->sin_addr.s_addr = addr;
285         sin->sin_port = port;
286 }
287
288 static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg)
289 {
290         int res;
291
292         mm_segment_t oldfs = get_fs();
293         set_fs(get_ds());
294         res = devinet_ioctl(cmd, (struct ifreq __user *) arg);
295         set_fs(oldfs);
296         return res;
297 }
298
299 static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg)
300 {
301         int res;
302
303         mm_segment_t oldfs = get_fs();
304         set_fs(get_ds());
305         res = ip_rt_ioctl(&init_net, cmd, (void __user *) arg);
306         set_fs(oldfs);
307         return res;
308 }
309
310 /*
311  *      Set up interface addresses and routes.
312  */
313
314 static int __init ic_setup_if(void)
315 {
316         struct ifreq ir;
317         struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr;
318         int err;
319
320         memset(&ir, 0, sizeof(ir));
321         strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name);
322         set_sockaddr(sin, ic_myaddr, 0);
323         if ((err = ic_dev_ioctl(SIOCSIFADDR, &ir)) < 0) {
324                 printk(KERN_ERR "IP-Config: Unable to set interface address (%d).\n", err);
325                 return -1;
326         }
327         set_sockaddr(sin, ic_netmask, 0);
328         if ((err = ic_dev_ioctl(SIOCSIFNETMASK, &ir)) < 0) {
329                 printk(KERN_ERR "IP-Config: Unable to set interface netmask (%d).\n", err);
330                 return -1;
331         }
332         set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0);
333         if ((err = ic_dev_ioctl(SIOCSIFBRDADDR, &ir)) < 0) {
334                 printk(KERN_ERR "IP-Config: Unable to set interface broadcast address (%d).\n", err);
335                 return -1;
336         }
337         return 0;
338 }
339
340 static int __init ic_setup_routes(void)
341 {
342         /* No need to setup device routes, only the default route... */
343
344         if (ic_gateway != NONE) {
345                 struct rtentry rm;
346                 int err;
347
348                 memset(&rm, 0, sizeof(rm));
349                 if ((ic_gateway ^ ic_myaddr) & ic_netmask) {
350                         printk(KERN_ERR "IP-Config: Gateway not on directly connected network.\n");
351                         return -1;
352                 }
353                 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0);
354                 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0);
355                 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0);
356                 rm.rt_flags = RTF_UP | RTF_GATEWAY;
357                 if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) {
358                         printk(KERN_ERR "IP-Config: Cannot add default route (%d).\n", err);
359                         return -1;
360                 }
361         }
362
363         return 0;
364 }
365
366 /*
367  *      Fill in default values for all missing parameters.
368  */
369
370 static int __init ic_defaults(void)
371 {
372         /*
373          *      At this point we have no userspace running so need not
374          *      claim locks on system_utsname
375          */
376
377         if (!ic_host_name_set)
378                 sprintf(init_utsname()->nodename, "%u.%u.%u.%u", NIPQUAD(ic_myaddr));
379
380         if (root_server_addr == NONE)
381                 root_server_addr = ic_servaddr;
382
383         if (ic_netmask == NONE) {
384                 if (IN_CLASSA(ntohl(ic_myaddr)))
385                         ic_netmask = htonl(IN_CLASSA_NET);
386                 else if (IN_CLASSB(ntohl(ic_myaddr)))
387                         ic_netmask = htonl(IN_CLASSB_NET);
388                 else if (IN_CLASSC(ntohl(ic_myaddr)))
389                         ic_netmask = htonl(IN_CLASSC_NET);
390                 else {
391                         printk(KERN_ERR "IP-Config: Unable to guess netmask for address %u.%u.%u.%u\n",
392                                 NIPQUAD(ic_myaddr));
393                         return -1;
394                 }
395                 printk("IP-Config: Guessing netmask %u.%u.%u.%u\n", NIPQUAD(ic_netmask));
396         }
397
398         return 0;
399 }
400
401 /*
402  *      RARP support.
403  */
404
405 #ifdef IPCONFIG_RARP
406
407 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
408
409 static struct packet_type rarp_packet_type __initdata = {
410         .type = __constant_htons(ETH_P_RARP),
411         .func = ic_rarp_recv,
412 };
413
414 static inline void ic_rarp_init(void)
415 {
416         dev_add_pack(&rarp_packet_type);
417 }
418
419 static inline void ic_rarp_cleanup(void)
420 {
421         dev_remove_pack(&rarp_packet_type);
422 }
423
424 /*
425  *  Process received RARP packet.
426  */
427 static int __init
428 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
429 {
430         struct arphdr *rarp;
431         unsigned char *rarp_ptr;
432         __be32 sip, tip;
433         unsigned char *sha, *tha;               /* s for "source", t for "target" */
434         struct ic_device *d;
435
436         if (dev->nd_net != &init_net)
437                 goto drop;
438
439         if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
440                 return NET_RX_DROP;
441
442         if (!pskb_may_pull(skb, sizeof(struct arphdr)))
443                 goto drop;
444
445         /* Basic sanity checks can be done without the lock.  */
446         rarp = (struct arphdr *)skb_transport_header(skb);
447
448         /* If this test doesn't pass, it's not IP, or we should
449          * ignore it anyway.
450          */
451         if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd))
452                 goto drop;
453
454         /* If it's not a RARP reply, delete it. */
455         if (rarp->ar_op != htons(ARPOP_RREPLY))
456                 goto drop;
457
458         /* If it's not Ethernet, delete it. */
459         if (rarp->ar_pro != htons(ETH_P_IP))
460                 goto drop;
461
462         if (!pskb_may_pull(skb,
463                            sizeof(struct arphdr) +
464                            (2 * dev->addr_len) +
465                            (2 * 4)))
466                 goto drop;
467
468         /* OK, it is all there and looks valid, process... */
469         rarp = (struct arphdr *)skb_transport_header(skb);
470         rarp_ptr = (unsigned char *) (rarp + 1);
471
472         /* One reply at a time, please. */
473         spin_lock(&ic_recv_lock);
474
475         /* If we already have a reply, just drop the packet */
476         if (ic_got_reply)
477                 goto drop_unlock;
478
479         /* Find the ic_device that the packet arrived on */
480         d = ic_first_dev;
481         while (d && d->dev != dev)
482                 d = d->next;
483         if (!d)
484                 goto drop_unlock;       /* should never happen */
485
486         /* Extract variable-width fields */
487         sha = rarp_ptr;
488         rarp_ptr += dev->addr_len;
489         memcpy(&sip, rarp_ptr, 4);
490         rarp_ptr += 4;
491         tha = rarp_ptr;
492         rarp_ptr += dev->addr_len;
493         memcpy(&tip, rarp_ptr, 4);
494
495         /* Discard packets which are not meant for us. */
496         if (memcmp(tha, dev->dev_addr, dev->addr_len))
497                 goto drop_unlock;
498
499         /* Discard packets which are not from specified server. */
500         if (ic_servaddr != NONE && ic_servaddr != sip)
501                 goto drop_unlock;
502
503         /* We have a winner! */
504         ic_dev = dev;
505         if (ic_myaddr == NONE)
506                 ic_myaddr = tip;
507         ic_servaddr = sip;
508         ic_got_reply = IC_RARP;
509
510 drop_unlock:
511         /* Show's over.  Nothing to see here.  */
512         spin_unlock(&ic_recv_lock);
513
514 drop:
515         /* Throw the packet out. */
516         kfree_skb(skb);
517         return 0;
518 }
519
520
521 /*
522  *  Send RARP request packet over a single interface.
523  */
524 static void __init ic_rarp_send_if(struct ic_device *d)
525 {
526         struct net_device *dev = d->dev;
527         arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL,
528                  dev->dev_addr, dev->dev_addr);
529 }
530 #endif
531
532 /*
533  *      DHCP/BOOTP support.
534  */
535
536 #ifdef IPCONFIG_BOOTP
537
538 struct bootp_pkt {              /* BOOTP packet format */
539         struct iphdr iph;       /* IP header */
540         struct udphdr udph;     /* UDP header */
541         u8 op;                  /* 1=request, 2=reply */
542         u8 htype;               /* HW address type */
543         u8 hlen;                /* HW address length */
544         u8 hops;                /* Used only by gateways */
545         __be32 xid;             /* Transaction ID */
546         __be16 secs;            /* Seconds since we started */
547         __be16 flags;           /* Just what it says */
548         __be32 client_ip;               /* Client's IP address if known */
549         __be32 your_ip;         /* Assigned IP address */
550         __be32 server_ip;               /* (Next, e.g. NFS) Server's IP address */
551         __be32 relay_ip;                /* IP address of BOOTP relay */
552         u8 hw_addr[16];         /* Client's HW address */
553         u8 serv_name[64];       /* Server host name */
554         u8 boot_file[128];      /* Name of boot file */
555         u8 exten[312];          /* DHCP options / BOOTP vendor extensions */
556 };
557
558 /* packet ops */
559 #define BOOTP_REQUEST   1
560 #define BOOTP_REPLY     2
561
562 /* DHCP message types */
563 #define DHCPDISCOVER    1
564 #define DHCPOFFER       2
565 #define DHCPREQUEST     3
566 #define DHCPDECLINE     4
567 #define DHCPACK         5
568 #define DHCPNAK         6
569 #define DHCPRELEASE     7
570 #define DHCPINFORM      8
571
572 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
573
574 static struct packet_type bootp_packet_type __initdata = {
575         .type = __constant_htons(ETH_P_IP),
576         .func = ic_bootp_recv,
577 };
578
579
580 /*
581  *  Initialize DHCP/BOOTP extension fields in the request.
582  */
583
584 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 };
585
586 #ifdef IPCONFIG_DHCP
587
588 static void __init
589 ic_dhcp_init_options(u8 *options)
590 {
591         u8 mt = ((ic_servaddr == NONE)
592                  ? DHCPDISCOVER : DHCPREQUEST);
593         u8 *e = options;
594         int len;
595
596 #ifdef IPCONFIG_DEBUG
597         printk("DHCP: Sending message type %d\n", mt);
598 #endif
599
600         memcpy(e, ic_bootp_cookie, 4);  /* RFC1048 Magic Cookie */
601         e += 4;
602
603         *e++ = 53;              /* DHCP message type */
604         *e++ = 1;
605         *e++ = mt;
606
607         if (mt == DHCPREQUEST) {
608                 *e++ = 54;      /* Server ID (IP address) */
609                 *e++ = 4;
610                 memcpy(e, &ic_servaddr, 4);
611                 e += 4;
612
613                 *e++ = 50;      /* Requested IP address */
614                 *e++ = 4;
615                 memcpy(e, &ic_myaddr, 4);
616                 e += 4;
617         }
618
619         /* always? */
620         {
621                 static const u8 ic_req_params[] = {
622                         1,      /* Subnet mask */
623                         3,      /* Default gateway */
624                         6,      /* DNS server */
625                         12,     /* Host name */
626                         15,     /* Domain name */
627                         17,     /* Boot path */
628                         40,     /* NIS domain name */
629                 };
630
631                 *e++ = 55;      /* Parameter request list */
632                 *e++ = sizeof(ic_req_params);
633                 memcpy(e, ic_req_params, sizeof(ic_req_params));
634                 e += sizeof(ic_req_params);
635
636                 if (*vendor_class_identifier) {
637                         printk(KERN_INFO "DHCP: sending class identifier \"%s\"\n",
638                                vendor_class_identifier);
639                         *e++ = 60;      /* Class-identifier */
640                         len = strlen(vendor_class_identifier);
641                         *e++ = len;
642                         memcpy(e, vendor_class_identifier, len);
643                         e += len;
644                 }
645         }
646
647         *e++ = 255;     /* End of the list */
648 }
649
650 #endif /* IPCONFIG_DHCP */
651
652 static void __init ic_bootp_init_ext(u8 *e)
653 {
654         memcpy(e, ic_bootp_cookie, 4);  /* RFC1048 Magic Cookie */
655         e += 4;
656         *e++ = 1;               /* Subnet mask request */
657         *e++ = 4;
658         e += 4;
659         *e++ = 3;               /* Default gateway request */
660         *e++ = 4;
661         e += 4;
662         *e++ = 5;               /* Name server request */
663         *e++ = 8;
664         e += 8;
665         *e++ = 12;              /* Host name request */
666         *e++ = 32;
667         e += 32;
668         *e++ = 40;              /* NIS Domain name request */
669         *e++ = 32;
670         e += 32;
671         *e++ = 17;              /* Boot path */
672         *e++ = 40;
673         e += 40;
674
675         *e++ = 57;              /* set extension buffer size for reply */
676         *e++ = 2;
677         *e++ = 1;               /* 128+236+8+20+14, see dhcpd sources */
678         *e++ = 150;
679
680         *e++ = 255;             /* End of the list */
681 }
682
683
684 /*
685  *  Initialize the DHCP/BOOTP mechanism.
686  */
687 static inline void ic_bootp_init(void)
688 {
689         int i;
690
691         for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
692                 ic_nameservers[i] = NONE;
693
694         dev_add_pack(&bootp_packet_type);
695 }
696
697
698 /*
699  *  DHCP/BOOTP cleanup.
700  */
701 static inline void ic_bootp_cleanup(void)
702 {
703         dev_remove_pack(&bootp_packet_type);
704 }
705
706
707 /*
708  *  Send DHCP/BOOTP request to single interface.
709  */
710 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff)
711 {
712         struct net_device *dev = d->dev;
713         struct sk_buff *skb;
714         struct bootp_pkt *b;
715         int hh_len = LL_RESERVED_SPACE(dev);
716         struct iphdr *h;
717
718         /* Allocate packet */
719         skb = alloc_skb(sizeof(struct bootp_pkt) + hh_len + 15, GFP_KERNEL);
720         if (!skb)
721                 return;
722         skb_reserve(skb, hh_len);
723         b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt));
724         memset(b, 0, sizeof(struct bootp_pkt));
725
726         /* Construct IP header */
727         skb_reset_network_header(skb);
728         h = ip_hdr(skb);
729         h->version = 4;
730         h->ihl = 5;
731         h->tot_len = htons(sizeof(struct bootp_pkt));
732         h->frag_off = htons(IP_DF);
733         h->ttl = 64;
734         h->protocol = IPPROTO_UDP;
735         h->daddr = htonl(INADDR_BROADCAST);
736         h->check = ip_fast_csum((unsigned char *) h, h->ihl);
737
738         /* Construct UDP header */
739         b->udph.source = htons(68);
740         b->udph.dest = htons(67);
741         b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr));
742         /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */
743
744         /* Construct DHCP/BOOTP header */
745         b->op = BOOTP_REQUEST;
746         if (dev->type < 256) /* check for false types */
747                 b->htype = dev->type;
748         else if (dev->type == ARPHRD_IEEE802_TR) /* fix for token ring */
749                 b->htype = ARPHRD_IEEE802;
750         else if (dev->type == ARPHRD_FDDI)
751                 b->htype = ARPHRD_ETHER;
752         else {
753                 printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name);
754                 b->htype = dev->type; /* can cause undefined behavior */
755         }
756
757         /* server_ip and your_ip address are both already zero per RFC2131 */
758         b->hlen = dev->addr_len;
759         memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
760         b->secs = htons(jiffies_diff / HZ);
761         b->xid = d->xid;
762
763         /* add DHCP options or BOOTP extensions */
764 #ifdef IPCONFIG_DHCP
765         if (ic_proto_enabled & IC_USE_DHCP)
766                 ic_dhcp_init_options(b->exten);
767         else
768 #endif
769                 ic_bootp_init_ext(b->exten);
770
771         /* Chain packet down the line... */
772         skb->dev = dev;
773         skb->protocol = htons(ETH_P_IP);
774         if (dev_hard_header(skb, dev, ntohs(skb->protocol),
775                             dev->broadcast, dev->dev_addr, skb->len) < 0 ||
776             dev_queue_xmit(skb) < 0)
777                 printk("E");
778 }
779
780
781 /*
782  *  Copy BOOTP-supplied string if not already set.
783  */
784 static int __init ic_bootp_string(char *dest, char *src, int len, int max)
785 {
786         if (!len)
787                 return 0;
788         if (len > max-1)
789                 len = max-1;
790         memcpy(dest, src, len);
791         dest[len] = '\0';
792         return 1;
793 }
794
795
796 /*
797  *  Process BOOTP extensions.
798  */
799 static void __init ic_do_bootp_ext(u8 *ext)
800 {
801        u8 servers;
802        int i;
803
804 #ifdef IPCONFIG_DEBUG
805         u8 *c;
806
807         printk("DHCP/BOOTP: Got extension %d:",*ext);
808         for (c=ext+2; c<ext+2+ext[1]; c++)
809                 printk(" %02x", *c);
810         printk("\n");
811 #endif
812
813         switch (*ext++) {
814                 case 1:         /* Subnet mask */
815                         if (ic_netmask == NONE)
816                                 memcpy(&ic_netmask, ext+1, 4);
817                         break;
818                 case 3:         /* Default gateway */
819                         if (ic_gateway == NONE)
820                                 memcpy(&ic_gateway, ext+1, 4);
821                         break;
822                 case 6:         /* DNS server */
823                         servers= *ext/4;
824                         if (servers > CONF_NAMESERVERS_MAX)
825                                 servers = CONF_NAMESERVERS_MAX;
826                         for (i = 0; i < servers; i++) {
827                                 if (ic_nameservers[i] == NONE)
828                                         memcpy(&ic_nameservers[i], ext+1+4*i, 4);
829                         }
830                         break;
831                 case 12:        /* Host name */
832                         ic_bootp_string(utsname()->nodename, ext+1, *ext, __NEW_UTS_LEN);
833                         ic_host_name_set = 1;
834                         break;
835                 case 15:        /* Domain name (DNS) */
836                         ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
837                         break;
838                 case 17:        /* Root path */
839                         if (!root_server_path[0])
840                                 ic_bootp_string(root_server_path, ext+1, *ext, sizeof(root_server_path));
841                         break;
842                 case 40:        /* NIS Domain name (_not_ DNS) */
843                         ic_bootp_string(utsname()->domainname, ext+1, *ext, __NEW_UTS_LEN);
844                         break;
845         }
846 }
847
848
849 /*
850  *  Receive BOOTP reply.
851  */
852 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
853 {
854         struct bootp_pkt *b;
855         struct iphdr *h;
856         struct ic_device *d;
857         int len, ext_len;
858
859         if (dev->nd_net != &init_net)
860                 goto drop;
861
862         /* Perform verifications before taking the lock.  */
863         if (skb->pkt_type == PACKET_OTHERHOST)
864                 goto drop;
865
866         if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
867                 return NET_RX_DROP;
868
869         if (!pskb_may_pull(skb,
870                            sizeof(struct iphdr) +
871                            sizeof(struct udphdr)))
872                 goto drop;
873
874         b = (struct bootp_pkt *)skb_network_header(skb);
875         h = &b->iph;
876
877         if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP)
878                 goto drop;
879
880         /* Fragments are not supported */
881         if (h->frag_off & htons(IP_OFFSET | IP_MF)) {
882                 if (net_ratelimit())
883                         printk(KERN_ERR "DHCP/BOOTP: Ignoring fragmented "
884                                "reply.\n");
885                 goto drop;
886         }
887
888         if (skb->len < ntohs(h->tot_len))
889                 goto drop;
890
891         if (ip_fast_csum((char *) h, h->ihl))
892                 goto drop;
893
894         if (b->udph.source != htons(67) || b->udph.dest != htons(68))
895                 goto drop;
896
897         if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
898                 goto drop;
899
900         len = ntohs(b->udph.len) - sizeof(struct udphdr);
901         ext_len = len - (sizeof(*b) -
902                          sizeof(struct iphdr) -
903                          sizeof(struct udphdr) -
904                          sizeof(b->exten));
905         if (ext_len < 0)
906                 goto drop;
907
908         /* Ok the front looks good, make sure we can get at the rest.  */
909         if (!pskb_may_pull(skb, skb->len))
910                 goto drop;
911
912         b = (struct bootp_pkt *)skb_network_header(skb);
913         h = &b->iph;
914
915         /* One reply at a time, please. */
916         spin_lock(&ic_recv_lock);
917
918         /* If we already have a reply, just drop the packet */
919         if (ic_got_reply)
920                 goto drop_unlock;
921
922         /* Find the ic_device that the packet arrived on */
923         d = ic_first_dev;
924         while (d && d->dev != dev)
925                 d = d->next;
926         if (!d)
927                 goto drop_unlock;  /* should never happen */
928
929         /* Is it a reply to our BOOTP request? */
930         if (b->op != BOOTP_REPLY ||
931             b->xid != d->xid) {
932                 if (net_ratelimit())
933                         printk(KERN_ERR "DHCP/BOOTP: Reply not for us, "
934                                "op[%x] xid[%x]\n",
935                                b->op, b->xid);
936                 goto drop_unlock;
937         }
938
939         /* Parse extensions */
940         if (ext_len >= 4 &&
941             !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */
942                 u8 *end = (u8 *) b + ntohs(b->iph.tot_len);
943                 u8 *ext;
944
945 #ifdef IPCONFIG_DHCP
946                 if (ic_proto_enabled & IC_USE_DHCP) {
947                         __be32 server_id = NONE;
948                         int mt = 0;
949
950                         ext = &b->exten[4];
951                         while (ext < end && *ext != 0xff) {
952                                 u8 *opt = ext++;
953                                 if (*opt == 0)  /* Padding */
954                                         continue;
955                                 ext += *ext + 1;
956                                 if (ext >= end)
957                                         break;
958                                 switch (*opt) {
959                                 case 53:        /* Message type */
960                                         if (opt[1])
961                                                 mt = opt[2];
962                                         break;
963                                 case 54:        /* Server ID (IP address) */
964                                         if (opt[1] >= 4)
965                                                 memcpy(&server_id, opt + 2, 4);
966                                         break;
967                                 }
968                         }
969
970 #ifdef IPCONFIG_DEBUG
971                         printk("DHCP: Got message type %d\n", mt);
972 #endif
973
974                         switch (mt) {
975                         case DHCPOFFER:
976                                 /* While in the process of accepting one offer,
977                                  * ignore all others.
978                                  */
979                                 if (ic_myaddr != NONE)
980                                         goto drop_unlock;
981
982                                 /* Let's accept that offer. */
983                                 ic_myaddr = b->your_ip;
984                                 ic_servaddr = server_id;
985 #ifdef IPCONFIG_DEBUG
986                                 printk("DHCP: Offered address %u.%u.%u.%u",
987                                        NIPQUAD(ic_myaddr));
988                                 printk(" by server %u.%u.%u.%u\n",
989                                        NIPQUAD(ic_servaddr));
990 #endif
991                                 /* The DHCP indicated server address takes
992                                  * precedence over the bootp header one if
993                                  * they are different.
994                                  */
995                                 if ((server_id != NONE) &&
996                                     (b->server_ip != server_id))
997                                         b->server_ip = ic_servaddr;
998                                 break;
999
1000                         case DHCPACK:
1001                                 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0)
1002                                         goto drop_unlock;
1003
1004                                 /* Yeah! */
1005                                 break;
1006
1007                         default:
1008                                 /* Urque.  Forget it*/
1009                                 ic_myaddr = NONE;
1010                                 ic_servaddr = NONE;
1011                                 goto drop_unlock;
1012                         }
1013
1014                         ic_dhcp_msgtype = mt;
1015
1016                 }
1017 #endif /* IPCONFIG_DHCP */
1018
1019                 ext = &b->exten[4];
1020                 while (ext < end && *ext != 0xff) {
1021                         u8 *opt = ext++;
1022                         if (*opt == 0)  /* Padding */
1023                                 continue;
1024                         ext += *ext + 1;
1025                         if (ext < end)
1026                                 ic_do_bootp_ext(opt);
1027                 }
1028         }
1029
1030         /* We have a winner! */
1031         ic_dev = dev;
1032         ic_myaddr = b->your_ip;
1033         ic_servaddr = b->server_ip;
1034         if (ic_gateway == NONE && b->relay_ip)
1035                 ic_gateway = b->relay_ip;
1036         if (ic_nameservers[0] == NONE)
1037                 ic_nameservers[0] = ic_servaddr;
1038         ic_got_reply = IC_BOOTP;
1039
1040 drop_unlock:
1041         /* Show's over.  Nothing to see here.  */
1042         spin_unlock(&ic_recv_lock);
1043
1044 drop:
1045         /* Throw the packet out. */
1046         kfree_skb(skb);
1047
1048         return 0;
1049 }
1050
1051
1052 #endif
1053
1054
1055 /*
1056  *      Dynamic IP configuration -- DHCP, BOOTP, RARP.
1057  */
1058
1059 #ifdef IPCONFIG_DYNAMIC
1060
1061 static int __init ic_dynamic(void)
1062 {
1063         int retries;
1064         struct ic_device *d;
1065         unsigned long start_jiffies, timeout, jiff;
1066         int do_bootp = ic_proto_have_if & IC_BOOTP;
1067         int do_rarp = ic_proto_have_if & IC_RARP;
1068
1069         /*
1070          * If none of DHCP/BOOTP/RARP was selected, return with an error.
1071          * This routine gets only called when some pieces of information
1072          * are missing, and without DHCP/BOOTP/RARP we are unable to get it.
1073          */
1074         if (!ic_proto_enabled) {
1075                 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
1076                 return -1;
1077         }
1078
1079 #ifdef IPCONFIG_BOOTP
1080         if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
1081                 printk(KERN_ERR "DHCP/BOOTP: No suitable device found.\n");
1082 #endif
1083 #ifdef IPCONFIG_RARP
1084         if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)
1085                 printk(KERN_ERR "RARP: No suitable device found.\n");
1086 #endif
1087
1088         if (!ic_proto_have_if)
1089                 /* Error message already printed */
1090                 return -1;
1091
1092         /*
1093          * Setup protocols
1094          */
1095 #ifdef IPCONFIG_BOOTP
1096         if (do_bootp)
1097                 ic_bootp_init();
1098 #endif
1099 #ifdef IPCONFIG_RARP
1100         if (do_rarp)
1101                 ic_rarp_init();
1102 #endif
1103
1104         /*
1105          * Send requests and wait, until we get an answer. This loop
1106          * seems to be a terrible waste of CPU time, but actually there is
1107          * only one process running at all, so we don't need to use any
1108          * scheduler functions.
1109          * [Actually we could now, but the nothing else running note still
1110          *  applies.. - AC]
1111          */
1112         printk(KERN_NOTICE "Sending %s%s%s requests .",
1113                do_bootp
1114                 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "",
1115                (do_bootp && do_rarp) ? " and " : "",
1116                do_rarp ? "RARP" : "");
1117
1118         start_jiffies = jiffies;
1119         d = ic_first_dev;
1120         retries = CONF_SEND_RETRIES;
1121         get_random_bytes(&timeout, sizeof(timeout));
1122         timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned) CONF_TIMEOUT_RANDOM);
1123         for (;;) {
1124 #ifdef IPCONFIG_BOOTP
1125                 if (do_bootp && (d->able & IC_BOOTP))
1126                         ic_bootp_send_if(d, jiffies - start_jiffies);
1127 #endif
1128 #ifdef IPCONFIG_RARP
1129                 if (do_rarp && (d->able & IC_RARP))
1130                         ic_rarp_send_if(d);
1131 #endif
1132
1133                 jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout);
1134                 while (time_before(jiffies, jiff) && !ic_got_reply)
1135                         schedule_timeout_uninterruptible(1);
1136 #ifdef IPCONFIG_DHCP
1137                 /* DHCP isn't done until we get a DHCPACK. */
1138                 if ((ic_got_reply & IC_BOOTP)
1139                     && (ic_proto_enabled & IC_USE_DHCP)
1140                     && ic_dhcp_msgtype != DHCPACK)
1141                 {
1142                         ic_got_reply = 0;
1143                         printk(",");
1144                         continue;
1145                 }
1146 #endif /* IPCONFIG_DHCP */
1147
1148                 if (ic_got_reply) {
1149                         printk(" OK\n");
1150                         break;
1151                 }
1152
1153                 if ((d = d->next))
1154                         continue;
1155
1156                 if (! --retries) {
1157                         printk(" timed out!\n");
1158                         break;
1159                 }
1160
1161                 d = ic_first_dev;
1162
1163                 timeout = timeout CONF_TIMEOUT_MULT;
1164                 if (timeout > CONF_TIMEOUT_MAX)
1165                         timeout = CONF_TIMEOUT_MAX;
1166
1167                 printk(".");
1168         }
1169
1170 #ifdef IPCONFIG_BOOTP
1171         if (do_bootp)
1172                 ic_bootp_cleanup();
1173 #endif
1174 #ifdef IPCONFIG_RARP
1175         if (do_rarp)
1176                 ic_rarp_cleanup();
1177 #endif
1178
1179         if (!ic_got_reply) {
1180                 ic_myaddr = NONE;
1181                 return -1;
1182         }
1183
1184         printk("IP-Config: Got %s answer from %u.%u.%u.%u, ",
1185                 ((ic_got_reply & IC_RARP) ? "RARP"
1186                  : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),
1187                 NIPQUAD(ic_servaddr));
1188         printk("my address is %u.%u.%u.%u\n", NIPQUAD(ic_myaddr));
1189
1190         return 0;
1191 }
1192
1193 #endif /* IPCONFIG_DYNAMIC */
1194
1195 #ifdef CONFIG_PROC_FS
1196
1197 static int pnp_seq_show(struct seq_file *seq, void *v)
1198 {
1199         int i;
1200
1201         if (ic_proto_used & IC_PROTO)
1202                 seq_printf(seq, "#PROTO: %s\n",
1203                            (ic_proto_used & IC_RARP) ? "RARP"
1204                            : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP");
1205         else
1206                 seq_puts(seq, "#MANUAL\n");
1207
1208         if (ic_domain[0])
1209                 seq_printf(seq,
1210                            "domain %s\n", ic_domain);
1211         for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {
1212                 if (ic_nameservers[i] != NONE)
1213                         seq_printf(seq,
1214                                    "nameserver %u.%u.%u.%u\n",
1215                                    NIPQUAD(ic_nameservers[i]));
1216         }
1217         if (ic_servaddr != NONE)
1218                 seq_printf(seq,
1219                            "bootserver %u.%u.%u.%u\n",
1220                            NIPQUAD(ic_servaddr));
1221         return 0;
1222 }
1223
1224 static int pnp_seq_open(struct inode *indoe, struct file *file)
1225 {
1226         return single_open(file, pnp_seq_show, NULL);
1227 }
1228
1229 static const struct file_operations pnp_seq_fops = {
1230         .owner          = THIS_MODULE,
1231         .open           = pnp_seq_open,
1232         .read           = seq_read,
1233         .llseek         = seq_lseek,
1234         .release        = single_release,
1235 };
1236 #endif /* CONFIG_PROC_FS */
1237
1238 /*
1239  *  Extract IP address from the parameter string if needed. Note that we
1240  *  need to have root_server_addr set _before_ IPConfig gets called as it
1241  *  can override it.
1242  */
1243 __be32 __init root_nfs_parse_addr(char *name)
1244 {
1245         __be32 addr;
1246         int octets = 0;
1247         char *cp, *cq;
1248
1249         cp = cq = name;
1250         while (octets < 4) {
1251                 while (*cp >= '0' && *cp <= '9')
1252                         cp++;
1253                 if (cp == cq || cp - cq > 3)
1254                         break;
1255                 if (*cp == '.' || octets == 3)
1256                         octets++;
1257                 if (octets < 4)
1258                         cp++;
1259                 cq = cp;
1260         }
1261         if (octets == 4 && (*cp == ':' || *cp == '\0')) {
1262                 if (*cp == ':')
1263                         *cp++ = '\0';
1264                 addr = in_aton(name);
1265                 memmove(name, cp, strlen(cp) + 1);
1266         } else
1267                 addr = NONE;
1268
1269         return addr;
1270 }
1271
1272 /*
1273  *      IP Autoconfig dispatcher.
1274  */
1275
1276 static int __init ip_auto_config(void)
1277 {
1278         __be32 addr;
1279
1280 #ifdef CONFIG_PROC_FS
1281         proc_net_fops_create(&init_net, "pnp", S_IRUGO, &pnp_seq_fops);
1282 #endif /* CONFIG_PROC_FS */
1283
1284         if (!ic_enable)
1285                 return 0;
1286
1287         DBG(("IP-Config: Entered.\n"));
1288 #ifdef IPCONFIG_DYNAMIC
1289  try_try_again:
1290 #endif
1291         /* Give hardware a chance to settle */
1292         msleep(CONF_PRE_OPEN);
1293
1294         /* Setup all network devices */
1295         if (ic_open_devs() < 0)
1296                 return -1;
1297
1298         /* Give drivers a chance to settle */
1299         ssleep(CONF_POST_OPEN);
1300
1301         /*
1302          * If the config information is insufficient (e.g., our IP address or
1303          * IP address of the boot server is missing or we have multiple network
1304          * interfaces and no default was set), use BOOTP or RARP to get the
1305          * missing values.
1306          */
1307         if (ic_myaddr == NONE ||
1308 #ifdef CONFIG_ROOT_NFS
1309             (root_server_addr == NONE
1310              && ic_servaddr == NONE
1311              && ROOT_DEV == Root_NFS) ||
1312 #endif
1313             ic_first_dev->next) {
1314 #ifdef IPCONFIG_DYNAMIC
1315
1316                 int retries = CONF_OPEN_RETRIES;
1317
1318                 if (ic_dynamic() < 0) {
1319                         ic_close_devs();
1320
1321                         /*
1322                          * I don't know why, but sometimes the
1323                          * eepro100 driver (at least) gets upset and
1324                          * doesn't work the first time it's opened.
1325                          * But then if you close it and reopen it, it
1326                          * works just fine.  So we need to try that at
1327                          * least once before giving up.
1328                          *
1329                          * Also, if the root will be NFS-mounted, we
1330                          * have nowhere to go if DHCP fails.  So we
1331                          * just have to keep trying forever.
1332                          *
1333                          *                              -- Chip
1334                          */
1335 #ifdef CONFIG_ROOT_NFS
1336                         if (ROOT_DEV ==  Root_NFS) {
1337                                 printk(KERN_ERR
1338                                         "IP-Config: Retrying forever (NFS root)...\n");
1339                                 goto try_try_again;
1340                         }
1341 #endif
1342
1343                         if (--retries) {
1344                                 printk(KERN_ERR
1345                                        "IP-Config: Reopening network devices...\n");
1346                                 goto try_try_again;
1347                         }
1348
1349                         /* Oh, well.  At least we tried. */
1350                         printk(KERN_ERR "IP-Config: Auto-configuration of network failed.\n");
1351                         return -1;
1352                 }
1353 #else /* !DYNAMIC */
1354                 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
1355                 ic_close_devs();
1356                 return -1;
1357 #endif /* IPCONFIG_DYNAMIC */
1358         } else {
1359                 /* Device selected manually or only one device -> use it */
1360                 ic_dev = ic_first_dev->dev;
1361         }
1362
1363         addr = root_nfs_parse_addr(root_server_path);
1364         if (root_server_addr == NONE)
1365                 root_server_addr = addr;
1366
1367         /*
1368          * Use defaults whereever applicable.
1369          */
1370         if (ic_defaults() < 0)
1371                 return -1;
1372
1373         /*
1374          * Close all network devices except the device we've
1375          * autoconfigured and set up routes.
1376          */
1377         ic_close_devs();
1378         if (ic_setup_if() < 0 || ic_setup_routes() < 0)
1379                 return -1;
1380
1381         /*
1382          * Record which protocol was actually used.
1383          */
1384 #ifdef IPCONFIG_DYNAMIC
1385         ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP);
1386 #endif
1387
1388 #ifndef IPCONFIG_SILENT
1389         /*
1390          * Clue in the operator.
1391          */
1392         printk("IP-Config: Complete:");
1393         printk("\n     device=%s", ic_dev->name);
1394         printk(", addr=%u.%u.%u.%u", NIPQUAD(ic_myaddr));
1395         printk(", mask=%u.%u.%u.%u", NIPQUAD(ic_netmask));
1396         printk(", gw=%u.%u.%u.%u", NIPQUAD(ic_gateway));
1397         printk(",\n     host=%s, domain=%s, nis-domain=%s",
1398                utsname()->nodename, ic_domain, utsname()->domainname);
1399         printk(",\n     bootserver=%u.%u.%u.%u", NIPQUAD(ic_servaddr));
1400         printk(", rootserver=%u.%u.%u.%u", NIPQUAD(root_server_addr));
1401         printk(", rootpath=%s", root_server_path);
1402         printk("\n");
1403 #endif /* !SILENT */
1404
1405         return 0;
1406 }
1407
1408 late_initcall(ip_auto_config);
1409
1410
1411 /*
1412  *  Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
1413  *  command line parameter.  See Documentation/nfsroot.txt.
1414  */
1415 static int __init ic_proto_name(char *name)
1416 {
1417         if (!strcmp(name, "on") || !strcmp(name, "any")) {
1418                 return 1;
1419         }
1420         if (!strcmp(name, "off") || !strcmp(name, "none")) {
1421                 return 0;
1422         }
1423 #ifdef CONFIG_IP_PNP_DHCP
1424         else if (!strcmp(name, "dhcp")) {
1425                 ic_proto_enabled &= ~IC_RARP;
1426                 return 1;
1427         }
1428 #endif
1429 #ifdef CONFIG_IP_PNP_BOOTP
1430         else if (!strcmp(name, "bootp")) {
1431                 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP);
1432                 return 1;
1433         }
1434 #endif
1435 #ifdef CONFIG_IP_PNP_RARP
1436         else if (!strcmp(name, "rarp")) {
1437                 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP);
1438                 return 1;
1439         }
1440 #endif
1441 #ifdef IPCONFIG_DYNAMIC
1442         else if (!strcmp(name, "both")) {
1443                 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */
1444                 return 1;
1445         }
1446 #endif
1447         return 0;
1448 }
1449
1450 static int __init ip_auto_config_setup(char *addrs)
1451 {
1452         char *cp, *ip, *dp;
1453         int num = 0;
1454
1455         ic_set_manually = 1;
1456         ic_enable = 1;
1457
1458         /*
1459          * If any dhcp, bootp etc options are set, leave autoconfig on
1460          * and skip the below static IP processing.
1461          */
1462         if (ic_proto_name(addrs))
1463                 return 1;
1464
1465         /* If no static IP is given, turn off autoconfig and bail.  */
1466         if (*addrs == 0 ||
1467             strcmp(addrs, "off") == 0 ||
1468             strcmp(addrs, "none") == 0) {
1469                 ic_enable = 0;
1470                 return 1;
1471         }
1472
1473         /* Parse string for static IP assignment.  */
1474         ip = addrs;
1475         while (ip && *ip) {
1476                 if ((cp = strchr(ip, ':')))
1477                         *cp++ = '\0';
1478                 if (strlen(ip) > 0) {
1479                         DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip));
1480                         switch (num) {
1481                         case 0:
1482                                 if ((ic_myaddr = in_aton(ip)) == INADDR_ANY)
1483                                         ic_myaddr = NONE;
1484                                 break;
1485                         case 1:
1486                                 if ((ic_servaddr = in_aton(ip)) == INADDR_ANY)
1487                                         ic_servaddr = NONE;
1488                                 break;
1489                         case 2:
1490                                 if ((ic_gateway = in_aton(ip)) == INADDR_ANY)
1491                                         ic_gateway = NONE;
1492                                 break;
1493                         case 3:
1494                                 if ((ic_netmask = in_aton(ip)) == INADDR_ANY)
1495                                         ic_netmask = NONE;
1496                                 break;
1497                         case 4:
1498                                 if ((dp = strchr(ip, '.'))) {
1499                                         *dp++ = '\0';
1500                                         strlcpy(utsname()->domainname, dp,
1501                                                 sizeof(utsname()->domainname));
1502                                 }
1503                                 strlcpy(utsname()->nodename, ip,
1504                                         sizeof(utsname()->nodename));
1505                                 ic_host_name_set = 1;
1506                                 break;
1507                         case 5:
1508                                 strlcpy(user_dev_name, ip, sizeof(user_dev_name));
1509                                 break;
1510                         case 6:
1511                                 if (ic_proto_name(ip) == 0 &&
1512                                     ic_myaddr == NONE) {
1513                                         ic_enable = 0;
1514                                 }
1515                                 break;
1516                         }
1517                 }
1518                 ip = cp;
1519                 num++;
1520         }
1521
1522         return 1;
1523 }
1524
1525 static int __init nfsaddrs_config_setup(char *addrs)
1526 {
1527         return ip_auto_config_setup(addrs);
1528 }
1529
1530 static int __init vendor_class_identifier_setup(char *addrs)
1531 {
1532         if (strlcpy(vendor_class_identifier, addrs,
1533                     sizeof(vendor_class_identifier))
1534             >= sizeof(vendor_class_identifier))
1535                 printk(KERN_WARNING "DHCP: vendorclass too long, truncated to \"%s\"",
1536                        vendor_class_identifier);
1537         return 1;
1538 }
1539
1540 __setup("ip=", ip_auto_config_setup);
1541 __setup("nfsaddrs=", nfsaddrs_config_setup);
1542 __setup("dhcpclass=", vendor_class_identifier_setup);