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Merge branch 'x86-fpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[mv-sheeva.git] / net / ipv4 / ipconfig.c
1 /*
2  *  Automatic Configuration of IP -- use DHCP, BOOTP, RARP, or
3  *  user-supplied information to configure own IP address and routes.
4  *
5  *  Copyright (C) 1996-1998 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
6  *
7  *  Derived from network configuration code in fs/nfs/nfsroot.c,
8  *  originally Copyright (C) 1995, 1996 Gero Kuhlmann and me.
9  *
10  *  BOOTP rewritten to construct and analyse packets itself instead
11  *  of misusing the IP layer. num_bugs_causing_wrong_arp_replies--;
12  *                                           -- MJ, December 1998
13  *
14  *  Fixed ip_auto_config_setup calling at startup in the new "Linker Magic"
15  *  initialization scheme.
16  *      - Arnaldo Carvalho de Melo <acme@conectiva.com.br>, 08/11/1999
17  *
18  *  DHCP support added.  To users this looks like a whole separate
19  *  protocol, but we know it's just a bag on the side of BOOTP.
20  *              -- Chip Salzenberg <chip@valinux.com>, May 2000
21  *
22  *  Ported DHCP support from 2.2.16 to 2.4.0-test4
23  *              -- Eric Biederman <ebiederman@lnxi.com>, 30 Aug 2000
24  *
25  *  Merged changes from 2.2.19 into 2.4.3
26  *              -- Eric Biederman <ebiederman@lnxi.com>, 22 April Aug 2001
27  *
28  *  Multiple Nameservers in /proc/net/pnp
29  *              --  Josef Siemes <jsiemes@web.de>, Aug 2002
30  */
31
32 #include <linux/types.h>
33 #include <linux/string.h>
34 #include <linux/kernel.h>
35 #include <linux/jiffies.h>
36 #include <linux/random.h>
37 #include <linux/init.h>
38 #include <linux/utsname.h>
39 #include <linux/in.h>
40 #include <linux/if.h>
41 #include <linux/inet.h>
42 #include <linux/inetdevice.h>
43 #include <linux/netdevice.h>
44 #include <linux/if_arp.h>
45 #include <linux/skbuff.h>
46 #include <linux/ip.h>
47 #include <linux/socket.h>
48 #include <linux/route.h>
49 #include <linux/udp.h>
50 #include <linux/proc_fs.h>
51 #include <linux/seq_file.h>
52 #include <linux/major.h>
53 #include <linux/root_dev.h>
54 #include <linux/delay.h>
55 #include <linux/nfs_fs.h>
56 #include <net/net_namespace.h>
57 #include <net/arp.h>
58 #include <net/ip.h>
59 #include <net/ipconfig.h>
60 #include <net/route.h>
61
62 #include <asm/uaccess.h>
63 #include <net/checksum.h>
64 #include <asm/processor.h>
65
66 /* Define this to allow debugging output */
67 #undef IPCONFIG_DEBUG
68
69 #ifdef IPCONFIG_DEBUG
70 #define DBG(x) printk x
71 #else
72 #define DBG(x) do { } while(0)
73 #endif
74
75 #if defined(CONFIG_IP_PNP_DHCP)
76 #define IPCONFIG_DHCP
77 #endif
78 #if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_DHCP)
79 #define IPCONFIG_BOOTP
80 #endif
81 #if defined(CONFIG_IP_PNP_RARP)
82 #define IPCONFIG_RARP
83 #endif
84 #if defined(IPCONFIG_BOOTP) || defined(IPCONFIG_RARP)
85 #define IPCONFIG_DYNAMIC
86 #endif
87
88 /* Define the friendly delay before and after opening net devices */
89 #define CONF_PRE_OPEN           500     /* Before opening: 1/2 second */
90 #define CONF_POST_OPEN          1       /* After opening: 1 second */
91
92 /* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */
93 #define CONF_OPEN_RETRIES       2       /* (Re)open devices twice */
94 #define CONF_SEND_RETRIES       6       /* Send six requests per open */
95 #define CONF_INTER_TIMEOUT      (HZ/2)  /* Inter-device timeout: 1/2 second */
96 #define CONF_BASE_TIMEOUT       (HZ*2)  /* Initial timeout: 2 seconds */
97 #define CONF_TIMEOUT_RANDOM     (HZ)    /* Maximum amount of randomization */
98 #define CONF_TIMEOUT_MULT       *7/4    /* Rate of timeout growth */
99 #define CONF_TIMEOUT_MAX        (HZ*30) /* Maximum allowed timeout */
100 #define CONF_NAMESERVERS_MAX   3       /* Maximum number of nameservers
101                                            - '3' from resolv.h */
102
103 #define NONE cpu_to_be32(INADDR_NONE)
104 #define ANY cpu_to_be32(INADDR_ANY)
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 u32 ic_dev_xid;         /* Device under configuration */
143
144 /* vendor class identifier */
145 static char vendor_class_identifier[253] __initdata;
146
147 /* Persistent data: */
148
149 static int ic_proto_used;                       /* Protocol used, if any */
150 static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */
151 static u8 ic_domain[64];                /* DNS (not NIS) domain name */
152
153 /*
154  * Private state.
155  */
156
157 /* Name of user-selected boot device */
158 static char user_dev_name[IFNAMSIZ] __initdata = { 0, };
159
160 /* Protocols supported by available interfaces */
161 static int ic_proto_have_if __initdata = 0;
162
163 #ifdef IPCONFIG_DYNAMIC
164 static DEFINE_SPINLOCK(ic_recv_lock);
165 static volatile int ic_got_reply __initdata = 0;    /* Proto(s) that replied */
166 #endif
167 #ifdef IPCONFIG_DHCP
168 static int ic_dhcp_msgtype __initdata = 0;      /* DHCP msg type received */
169 #endif
170
171
172 /*
173  *      Network devices
174  */
175
176 struct ic_device {
177         struct ic_device *next;
178         struct net_device *dev;
179         unsigned short flags;
180         short able;
181         __be32 xid;
182 };
183
184 static struct ic_device *ic_first_dev __initdata = NULL;/* List of open device */
185 static struct net_device *ic_dev __initdata = NULL;     /* Selected device */
186
187 static int __init ic_open_devs(void)
188 {
189         struct ic_device *d, **last;
190         struct net_device *dev;
191         unsigned short oflags;
192
193         last = &ic_first_dev;
194         rtnl_lock();
195
196         /* bring loopback device up first */
197         for_each_netdev(&init_net, dev) {
198                 if (!(dev->flags & IFF_LOOPBACK))
199                         continue;
200                 if (dev_change_flags(dev, dev->flags | IFF_UP) < 0)
201                         printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name);
202         }
203
204         for_each_netdev(&init_net, dev) {
205                 if (dev->flags & IFF_LOOPBACK)
206                         continue;
207                 if (user_dev_name[0] ? !strcmp(dev->name, user_dev_name) :
208                     (!(dev->flags & IFF_LOOPBACK) &&
209                      (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) &&
210                      strncmp(dev->name, "dummy", 5))) {
211                         int able = 0;
212                         if (dev->mtu >= 364)
213                                 able |= IC_BOOTP;
214                         else
215                                 printk(KERN_WARNING "DHCP/BOOTP: Ignoring device %s, MTU %d too small", dev->name, dev->mtu);
216                         if (!(dev->flags & IFF_NOARP))
217                                 able |= IC_RARP;
218                         able &= ic_proto_enabled;
219                         if (ic_proto_enabled && !able)
220                                 continue;
221                         oflags = dev->flags;
222                         if (dev_change_flags(dev, oflags | IFF_UP) < 0) {
223                                 printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name);
224                                 continue;
225                         }
226                         if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) {
227                                 rtnl_unlock();
228                                 return -1;
229                         }
230                         d->dev = dev;
231                         *last = d;
232                         last = &d->next;
233                         d->flags = oflags;
234                         d->able = able;
235                         if (able & IC_BOOTP)
236                                 get_random_bytes(&d->xid, sizeof(__be32));
237                         else
238                                 d->xid = 0;
239                         ic_proto_have_if |= able;
240                         DBG(("IP-Config: %s UP (able=%d, xid=%08x)\n",
241                                 dev->name, able, d->xid));
242                 }
243         }
244         rtnl_unlock();
245
246         *last = NULL;
247
248         if (!ic_first_dev) {
249                 if (user_dev_name[0])
250                         printk(KERN_ERR "IP-Config: Device `%s' not found.\n", user_dev_name);
251                 else
252                         printk(KERN_ERR "IP-Config: No network devices available.\n");
253                 return -1;
254         }
255         return 0;
256 }
257
258 static void __init ic_close_devs(void)
259 {
260         struct ic_device *d, *next;
261         struct net_device *dev;
262
263         rtnl_lock();
264         next = ic_first_dev;
265         while ((d = next)) {
266                 next = d->next;
267                 dev = d->dev;
268                 if (dev != ic_dev) {
269                         DBG(("IP-Config: Downing %s\n", dev->name));
270                         dev_change_flags(dev, d->flags);
271                 }
272                 kfree(d);
273         }
274         rtnl_unlock();
275 }
276
277 /*
278  *      Interface to various network functions.
279  */
280
281 static inline void
282 set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port)
283 {
284         sin->sin_family = AF_INET;
285         sin->sin_addr.s_addr = addr;
286         sin->sin_port = port;
287 }
288
289 static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg)
290 {
291         int res;
292
293         mm_segment_t oldfs = get_fs();
294         set_fs(get_ds());
295         res = devinet_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
296         set_fs(oldfs);
297         return res;
298 }
299
300 static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg)
301 {
302         int res;
303
304         mm_segment_t oldfs = get_fs();
305         set_fs(get_ds());
306         res = ip_rt_ioctl(&init_net, cmd, (void __user *) arg);
307         set_fs(oldfs);
308         return res;
309 }
310
311 /*
312  *      Set up interface addresses and routes.
313  */
314
315 static int __init ic_setup_if(void)
316 {
317         struct ifreq ir;
318         struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr;
319         int err;
320
321         memset(&ir, 0, sizeof(ir));
322         strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name);
323         set_sockaddr(sin, ic_myaddr, 0);
324         if ((err = ic_dev_ioctl(SIOCSIFADDR, &ir)) < 0) {
325                 printk(KERN_ERR "IP-Config: Unable to set interface address (%d).\n", err);
326                 return -1;
327         }
328         set_sockaddr(sin, ic_netmask, 0);
329         if ((err = ic_dev_ioctl(SIOCSIFNETMASK, &ir)) < 0) {
330                 printk(KERN_ERR "IP-Config: Unable to set interface netmask (%d).\n", err);
331                 return -1;
332         }
333         set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0);
334         if ((err = ic_dev_ioctl(SIOCSIFBRDADDR, &ir)) < 0) {
335                 printk(KERN_ERR "IP-Config: Unable to set interface broadcast address (%d).\n", err);
336                 return -1;
337         }
338         return 0;
339 }
340
341 static int __init ic_setup_routes(void)
342 {
343         /* No need to setup device routes, only the default route... */
344
345         if (ic_gateway != NONE) {
346                 struct rtentry rm;
347                 int err;
348
349                 memset(&rm, 0, sizeof(rm));
350                 if ((ic_gateway ^ ic_myaddr) & ic_netmask) {
351                         printk(KERN_ERR "IP-Config: Gateway not on directly connected network.\n");
352                         return -1;
353                 }
354                 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0);
355                 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0);
356                 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0);
357                 rm.rt_flags = RTF_UP | RTF_GATEWAY;
358                 if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) {
359                         printk(KERN_ERR "IP-Config: Cannot add default route (%d).\n", err);
360                         return -1;
361                 }
362         }
363
364         return 0;
365 }
366
367 /*
368  *      Fill in default values for all missing parameters.
369  */
370
371 static int __init ic_defaults(void)
372 {
373         /*
374          *      At this point we have no userspace running so need not
375          *      claim locks on system_utsname
376          */
377
378         if (!ic_host_name_set)
379                 sprintf(init_utsname()->nodename, "%pI4", &ic_myaddr);
380
381         if (root_server_addr == NONE)
382                 root_server_addr = ic_servaddr;
383
384         if (ic_netmask == NONE) {
385                 if (IN_CLASSA(ntohl(ic_myaddr)))
386                         ic_netmask = htonl(IN_CLASSA_NET);
387                 else if (IN_CLASSB(ntohl(ic_myaddr)))
388                         ic_netmask = htonl(IN_CLASSB_NET);
389                 else if (IN_CLASSC(ntohl(ic_myaddr)))
390                         ic_netmask = htonl(IN_CLASSC_NET);
391                 else {
392                         printk(KERN_ERR "IP-Config: Unable to guess netmask for address %pI4\n",
393                                 &ic_myaddr);
394                         return -1;
395                 }
396                 printk("IP-Config: Guessing netmask %pI4\n", &ic_netmask);
397         }
398
399         return 0;
400 }
401
402 /*
403  *      RARP support.
404  */
405
406 #ifdef IPCONFIG_RARP
407
408 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
409
410 static struct packet_type rarp_packet_type __initdata = {
411         .type = cpu_to_be16(ETH_P_RARP),
412         .func = ic_rarp_recv,
413 };
414
415 static inline void __init ic_rarp_init(void)
416 {
417         dev_add_pack(&rarp_packet_type);
418 }
419
420 static inline void __init ic_rarp_cleanup(void)
421 {
422         dev_remove_pack(&rarp_packet_type);
423 }
424
425 /*
426  *  Process received RARP packet.
427  */
428 static int __init
429 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
430 {
431         struct arphdr *rarp;
432         unsigned char *rarp_ptr;
433         __be32 sip, tip;
434         unsigned char *sha, *tha;               /* s for "source", t for "target" */
435         struct ic_device *d;
436
437         if (!net_eq(dev_net(dev), &init_net))
438                 goto drop;
439
440         if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
441                 return NET_RX_DROP;
442
443         if (!pskb_may_pull(skb, sizeof(struct arphdr)))
444                 goto drop;
445
446         /* Basic sanity checks can be done without the lock.  */
447         rarp = (struct arphdr *)skb_transport_header(skb);
448
449         /* If this test doesn't pass, it's not IP, or we should
450          * ignore it anyway.
451          */
452         if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd))
453                 goto drop;
454
455         /* If it's not a RARP reply, delete it. */
456         if (rarp->ar_op != htons(ARPOP_RREPLY))
457                 goto drop;
458
459         /* If it's not Ethernet, delete it. */
460         if (rarp->ar_pro != htons(ETH_P_IP))
461                 goto drop;
462
463         if (!pskb_may_pull(skb, arp_hdr_len(dev)))
464                 goto drop;
465
466         /* OK, it is all there and looks valid, process... */
467         rarp = (struct arphdr *)skb_transport_header(skb);
468         rarp_ptr = (unsigned char *) (rarp + 1);
469
470         /* One reply at a time, please. */
471         spin_lock(&ic_recv_lock);
472
473         /* If we already have a reply, just drop the packet */
474         if (ic_got_reply)
475                 goto drop_unlock;
476
477         /* Find the ic_device that the packet arrived on */
478         d = ic_first_dev;
479         while (d && d->dev != dev)
480                 d = d->next;
481         if (!d)
482                 goto drop_unlock;       /* should never happen */
483
484         /* Extract variable-width fields */
485         sha = rarp_ptr;
486         rarp_ptr += dev->addr_len;
487         memcpy(&sip, rarp_ptr, 4);
488         rarp_ptr += 4;
489         tha = rarp_ptr;
490         rarp_ptr += dev->addr_len;
491         memcpy(&tip, rarp_ptr, 4);
492
493         /* Discard packets which are not meant for us. */
494         if (memcmp(tha, dev->dev_addr, dev->addr_len))
495                 goto drop_unlock;
496
497         /* Discard packets which are not from specified server. */
498         if (ic_servaddr != NONE && ic_servaddr != sip)
499                 goto drop_unlock;
500
501         /* We have a winner! */
502         ic_dev = dev;
503         if (ic_myaddr == NONE)
504                 ic_myaddr = tip;
505         ic_servaddr = sip;
506         ic_got_reply = IC_RARP;
507
508 drop_unlock:
509         /* Show's over.  Nothing to see here.  */
510         spin_unlock(&ic_recv_lock);
511
512 drop:
513         /* Throw the packet out. */
514         kfree_skb(skb);
515         return 0;
516 }
517
518
519 /*
520  *  Send RARP request packet over a single interface.
521  */
522 static void __init ic_rarp_send_if(struct ic_device *d)
523 {
524         struct net_device *dev = d->dev;
525         arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL,
526                  dev->dev_addr, dev->dev_addr);
527 }
528 #endif
529
530 /*
531  *      DHCP/BOOTP support.
532  */
533
534 #ifdef IPCONFIG_BOOTP
535
536 struct bootp_pkt {              /* BOOTP packet format */
537         struct iphdr iph;       /* IP header */
538         struct udphdr udph;     /* UDP header */
539         u8 op;                  /* 1=request, 2=reply */
540         u8 htype;               /* HW address type */
541         u8 hlen;                /* HW address length */
542         u8 hops;                /* Used only by gateways */
543         __be32 xid;             /* Transaction ID */
544         __be16 secs;            /* Seconds since we started */
545         __be16 flags;           /* Just what it says */
546         __be32 client_ip;               /* Client's IP address if known */
547         __be32 your_ip;         /* Assigned IP address */
548         __be32 server_ip;               /* (Next, e.g. NFS) Server's IP address */
549         __be32 relay_ip;                /* IP address of BOOTP relay */
550         u8 hw_addr[16];         /* Client's HW address */
551         u8 serv_name[64];       /* Server host name */
552         u8 boot_file[128];      /* Name of boot file */
553         u8 exten[312];          /* DHCP options / BOOTP vendor extensions */
554 };
555
556 /* packet ops */
557 #define BOOTP_REQUEST   1
558 #define BOOTP_REPLY     2
559
560 /* DHCP message types */
561 #define DHCPDISCOVER    1
562 #define DHCPOFFER       2
563 #define DHCPREQUEST     3
564 #define DHCPDECLINE     4
565 #define DHCPACK         5
566 #define DHCPNAK         6
567 #define DHCPRELEASE     7
568 #define DHCPINFORM      8
569
570 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
571
572 static struct packet_type bootp_packet_type __initdata = {
573         .type = cpu_to_be16(ETH_P_IP),
574         .func = ic_bootp_recv,
575 };
576
577
578 /*
579  *  Initialize DHCP/BOOTP extension fields in the request.
580  */
581
582 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 };
583
584 #ifdef IPCONFIG_DHCP
585
586 static void __init
587 ic_dhcp_init_options(u8 *options)
588 {
589         u8 mt = ((ic_servaddr == NONE)
590                  ? DHCPDISCOVER : DHCPREQUEST);
591         u8 *e = options;
592         int len;
593
594 #ifdef IPCONFIG_DEBUG
595         printk("DHCP: Sending message type %d\n", mt);
596 #endif
597
598         memcpy(e, ic_bootp_cookie, 4);  /* RFC1048 Magic Cookie */
599         e += 4;
600
601         *e++ = 53;              /* DHCP message type */
602         *e++ = 1;
603         *e++ = mt;
604
605         if (mt == DHCPREQUEST) {
606                 *e++ = 54;      /* Server ID (IP address) */
607                 *e++ = 4;
608                 memcpy(e, &ic_servaddr, 4);
609                 e += 4;
610
611                 *e++ = 50;      /* Requested IP address */
612                 *e++ = 4;
613                 memcpy(e, &ic_myaddr, 4);
614                 e += 4;
615         }
616
617         /* always? */
618         {
619                 static const u8 ic_req_params[] = {
620                         1,      /* Subnet mask */
621                         3,      /* Default gateway */
622                         6,      /* DNS server */
623                         12,     /* Host name */
624                         15,     /* Domain name */
625                         17,     /* Boot path */
626                         40,     /* NIS domain name */
627                 };
628
629                 *e++ = 55;      /* Parameter request list */
630                 *e++ = sizeof(ic_req_params);
631                 memcpy(e, ic_req_params, sizeof(ic_req_params));
632                 e += sizeof(ic_req_params);
633
634                 if (*vendor_class_identifier) {
635                         printk(KERN_INFO "DHCP: sending class identifier \"%s\"\n",
636                                vendor_class_identifier);
637                         *e++ = 60;      /* Class-identifier */
638                         len = strlen(vendor_class_identifier);
639                         *e++ = len;
640                         memcpy(e, vendor_class_identifier, len);
641                         e += len;
642                 }
643         }
644
645         *e++ = 255;     /* End of the list */
646 }
647
648 #endif /* IPCONFIG_DHCP */
649
650 static void __init ic_bootp_init_ext(u8 *e)
651 {
652         memcpy(e, ic_bootp_cookie, 4);  /* RFC1048 Magic Cookie */
653         e += 4;
654         *e++ = 1;               /* Subnet mask request */
655         *e++ = 4;
656         e += 4;
657         *e++ = 3;               /* Default gateway request */
658         *e++ = 4;
659         e += 4;
660         *e++ = 5;               /* Name server request */
661         *e++ = 8;
662         e += 8;
663         *e++ = 12;              /* Host name request */
664         *e++ = 32;
665         e += 32;
666         *e++ = 40;              /* NIS Domain name request */
667         *e++ = 32;
668         e += 32;
669         *e++ = 17;              /* Boot path */
670         *e++ = 40;
671         e += 40;
672
673         *e++ = 57;              /* set extension buffer size for reply */
674         *e++ = 2;
675         *e++ = 1;               /* 128+236+8+20+14, see dhcpd sources */
676         *e++ = 150;
677
678         *e++ = 255;             /* End of the list */
679 }
680
681
682 /*
683  *  Initialize the DHCP/BOOTP mechanism.
684  */
685 static inline void __init ic_bootp_init(void)
686 {
687         int i;
688
689         for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
690                 ic_nameservers[i] = NONE;
691
692         dev_add_pack(&bootp_packet_type);
693 }
694
695
696 /*
697  *  DHCP/BOOTP cleanup.
698  */
699 static inline void __init ic_bootp_cleanup(void)
700 {
701         dev_remove_pack(&bootp_packet_type);
702 }
703
704
705 /*
706  *  Send DHCP/BOOTP request to single interface.
707  */
708 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff)
709 {
710         struct net_device *dev = d->dev;
711         struct sk_buff *skb;
712         struct bootp_pkt *b;
713         struct iphdr *h;
714
715         /* Allocate packet */
716         skb = alloc_skb(sizeof(struct bootp_pkt) + LL_ALLOCATED_SPACE(dev) + 15,
717                         GFP_KERNEL);
718         if (!skb)
719                 return;
720         skb_reserve(skb, LL_RESERVED_SPACE(dev));
721         b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt));
722         memset(b, 0, sizeof(struct bootp_pkt));
723
724         /* Construct IP header */
725         skb_reset_network_header(skb);
726         h = ip_hdr(skb);
727         h->version = 4;
728         h->ihl = 5;
729         h->tot_len = htons(sizeof(struct bootp_pkt));
730         h->frag_off = htons(IP_DF);
731         h->ttl = 64;
732         h->protocol = IPPROTO_UDP;
733         h->daddr = htonl(INADDR_BROADCAST);
734         h->check = ip_fast_csum((unsigned char *) h, h->ihl);
735
736         /* Construct UDP header */
737         b->udph.source = htons(68);
738         b->udph.dest = htons(67);
739         b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr));
740         /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */
741
742         /* Construct DHCP/BOOTP header */
743         b->op = BOOTP_REQUEST;
744         if (dev->type < 256) /* check for false types */
745                 b->htype = dev->type;
746         else if (dev->type == ARPHRD_IEEE802_TR) /* fix for token ring */
747                 b->htype = ARPHRD_IEEE802;
748         else if (dev->type == ARPHRD_FDDI)
749                 b->htype = ARPHRD_ETHER;
750         else {
751                 printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name);
752                 b->htype = dev->type; /* can cause undefined behavior */
753         }
754
755         /* server_ip and your_ip address are both already zero per RFC2131 */
756         b->hlen = dev->addr_len;
757         memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
758         b->secs = htons(jiffies_diff / HZ);
759         b->xid = d->xid;
760
761         /* add DHCP options or BOOTP extensions */
762 #ifdef IPCONFIG_DHCP
763         if (ic_proto_enabled & IC_USE_DHCP)
764                 ic_dhcp_init_options(b->exten);
765         else
766 #endif
767                 ic_bootp_init_ext(b->exten);
768
769         /* Chain packet down the line... */
770         skb->dev = dev;
771         skb->protocol = htons(ETH_P_IP);
772         if (dev_hard_header(skb, dev, ntohs(skb->protocol),
773                             dev->broadcast, dev->dev_addr, skb->len) < 0 ||
774             dev_queue_xmit(skb) < 0)
775                 printk("E");
776 }
777
778
779 /*
780  *  Copy BOOTP-supplied string if not already set.
781  */
782 static int __init ic_bootp_string(char *dest, char *src, int len, int max)
783 {
784         if (!len)
785                 return 0;
786         if (len > max-1)
787                 len = max-1;
788         memcpy(dest, src, len);
789         dest[len] = '\0';
790         return 1;
791 }
792
793
794 /*
795  *  Process BOOTP extensions.
796  */
797 static void __init ic_do_bootp_ext(u8 *ext)
798 {
799        u8 servers;
800        int i;
801
802 #ifdef IPCONFIG_DEBUG
803         u8 *c;
804
805         printk("DHCP/BOOTP: Got extension %d:",*ext);
806         for (c=ext+2; c<ext+2+ext[1]; c++)
807                 printk(" %02x", *c);
808         printk("\n");
809 #endif
810
811         switch (*ext++) {
812                 case 1:         /* Subnet mask */
813                         if (ic_netmask == NONE)
814                                 memcpy(&ic_netmask, ext+1, 4);
815                         break;
816                 case 3:         /* Default gateway */
817                         if (ic_gateway == NONE)
818                                 memcpy(&ic_gateway, ext+1, 4);
819                         break;
820                 case 6:         /* DNS server */
821                         servers= *ext/4;
822                         if (servers > CONF_NAMESERVERS_MAX)
823                                 servers = CONF_NAMESERVERS_MAX;
824                         for (i = 0; i < servers; i++) {
825                                 if (ic_nameservers[i] == NONE)
826                                         memcpy(&ic_nameservers[i], ext+1+4*i, 4);
827                         }
828                         break;
829                 case 12:        /* Host name */
830                         ic_bootp_string(utsname()->nodename, ext+1, *ext, __NEW_UTS_LEN);
831                         ic_host_name_set = 1;
832                         break;
833                 case 15:        /* Domain name (DNS) */
834                         ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
835                         break;
836                 case 17:        /* Root path */
837                         if (!root_server_path[0])
838                                 ic_bootp_string(root_server_path, ext+1, *ext, sizeof(root_server_path));
839                         break;
840                 case 40:        /* NIS Domain name (_not_ DNS) */
841                         ic_bootp_string(utsname()->domainname, ext+1, *ext, __NEW_UTS_LEN);
842                         break;
843         }
844 }
845
846
847 /*
848  *  Receive BOOTP reply.
849  */
850 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
851 {
852         struct bootp_pkt *b;
853         struct iphdr *h;
854         struct ic_device *d;
855         int len, ext_len;
856
857         if (!net_eq(dev_net(dev), &init_net))
858                 goto drop;
859
860         /* Perform verifications before taking the lock.  */
861         if (skb->pkt_type == PACKET_OTHERHOST)
862                 goto drop;
863
864         if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
865                 return NET_RX_DROP;
866
867         if (!pskb_may_pull(skb,
868                            sizeof(struct iphdr) +
869                            sizeof(struct udphdr)))
870                 goto drop;
871
872         b = (struct bootp_pkt *)skb_network_header(skb);
873         h = &b->iph;
874
875         if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP)
876                 goto drop;
877
878         /* Fragments are not supported */
879         if (h->frag_off & htons(IP_OFFSET | IP_MF)) {
880                 if (net_ratelimit())
881                         printk(KERN_ERR "DHCP/BOOTP: Ignoring fragmented "
882                                "reply.\n");
883                 goto drop;
884         }
885
886         if (skb->len < ntohs(h->tot_len))
887                 goto drop;
888
889         if (ip_fast_csum((char *) h, h->ihl))
890                 goto drop;
891
892         if (b->udph.source != htons(67) || b->udph.dest != htons(68))
893                 goto drop;
894
895         if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
896                 goto drop;
897
898         len = ntohs(b->udph.len) - sizeof(struct udphdr);
899         ext_len = len - (sizeof(*b) -
900                          sizeof(struct iphdr) -
901                          sizeof(struct udphdr) -
902                          sizeof(b->exten));
903         if (ext_len < 0)
904                 goto drop;
905
906         /* Ok the front looks good, make sure we can get at the rest.  */
907         if (!pskb_may_pull(skb, skb->len))
908                 goto drop;
909
910         b = (struct bootp_pkt *)skb_network_header(skb);
911         h = &b->iph;
912
913         /* One reply at a time, please. */
914         spin_lock(&ic_recv_lock);
915
916         /* If we already have a reply, just drop the packet */
917         if (ic_got_reply)
918                 goto drop_unlock;
919
920         /* Find the ic_device that the packet arrived on */
921         d = ic_first_dev;
922         while (d && d->dev != dev)
923                 d = d->next;
924         if (!d)
925                 goto drop_unlock;  /* should never happen */
926
927         /* Is it a reply to our BOOTP request? */
928         if (b->op != BOOTP_REPLY ||
929             b->xid != d->xid) {
930                 if (net_ratelimit())
931                         printk(KERN_ERR "DHCP/BOOTP: Reply not for us, "
932                                "op[%x] xid[%x]\n",
933                                b->op, b->xid);
934                 goto drop_unlock;
935         }
936
937         /* Is it a reply for the device we are configuring? */
938         if (b->xid != ic_dev_xid) {
939                 if (net_ratelimit())
940                         printk(KERN_ERR "DHCP/BOOTP: Ignoring delayed packet \n");
941                 goto drop_unlock;
942         }
943
944         /* Parse extensions */
945         if (ext_len >= 4 &&
946             !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */
947                 u8 *end = (u8 *) b + ntohs(b->iph.tot_len);
948                 u8 *ext;
949
950 #ifdef IPCONFIG_DHCP
951                 if (ic_proto_enabled & IC_USE_DHCP) {
952                         __be32 server_id = NONE;
953                         int mt = 0;
954
955                         ext = &b->exten[4];
956                         while (ext < end && *ext != 0xff) {
957                                 u8 *opt = ext++;
958                                 if (*opt == 0)  /* Padding */
959                                         continue;
960                                 ext += *ext + 1;
961                                 if (ext >= end)
962                                         break;
963                                 switch (*opt) {
964                                 case 53:        /* Message type */
965                                         if (opt[1])
966                                                 mt = opt[2];
967                                         break;
968                                 case 54:        /* Server ID (IP address) */
969                                         if (opt[1] >= 4)
970                                                 memcpy(&server_id, opt + 2, 4);
971                                         break;
972                                 }
973                         }
974
975 #ifdef IPCONFIG_DEBUG
976                         printk("DHCP: Got message type %d\n", mt);
977 #endif
978
979                         switch (mt) {
980                         case DHCPOFFER:
981                                 /* While in the process of accepting one offer,
982                                  * ignore all others.
983                                  */
984                                 if (ic_myaddr != NONE)
985                                         goto drop_unlock;
986
987                                 /* Let's accept that offer. */
988                                 ic_myaddr = b->your_ip;
989                                 ic_servaddr = server_id;
990 #ifdef IPCONFIG_DEBUG
991                                 printk("DHCP: Offered address %pI4 by server %pI4\n",
992                                        &ic_myaddr, &ic_servaddr);
993 #endif
994                                 /* The DHCP indicated server address takes
995                                  * precedence over the bootp header one if
996                                  * they are different.
997                                  */
998                                 if ((server_id != NONE) &&
999                                     (b->server_ip != server_id))
1000                                         b->server_ip = ic_servaddr;
1001                                 break;
1002
1003                         case DHCPACK:
1004                                 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0)
1005                                         goto drop_unlock;
1006
1007                                 /* Yeah! */
1008                                 break;
1009
1010                         default:
1011                                 /* Urque.  Forget it*/
1012                                 ic_myaddr = NONE;
1013                                 ic_servaddr = NONE;
1014                                 goto drop_unlock;
1015                         }
1016
1017                         ic_dhcp_msgtype = mt;
1018
1019                 }
1020 #endif /* IPCONFIG_DHCP */
1021
1022                 ext = &b->exten[4];
1023                 while (ext < end && *ext != 0xff) {
1024                         u8 *opt = ext++;
1025                         if (*opt == 0)  /* Padding */
1026                                 continue;
1027                         ext += *ext + 1;
1028                         if (ext < end)
1029                                 ic_do_bootp_ext(opt);
1030                 }
1031         }
1032
1033         /* We have a winner! */
1034         ic_dev = dev;
1035         ic_myaddr = b->your_ip;
1036         ic_servaddr = b->server_ip;
1037         if (ic_gateway == NONE && b->relay_ip)
1038                 ic_gateway = b->relay_ip;
1039         if (ic_nameservers[0] == NONE)
1040                 ic_nameservers[0] = ic_servaddr;
1041         ic_got_reply = IC_BOOTP;
1042
1043 drop_unlock:
1044         /* Show's over.  Nothing to see here.  */
1045         spin_unlock(&ic_recv_lock);
1046
1047 drop:
1048         /* Throw the packet out. */
1049         kfree_skb(skb);
1050
1051         return 0;
1052 }
1053
1054
1055 #endif
1056
1057
1058 /*
1059  *      Dynamic IP configuration -- DHCP, BOOTP, RARP.
1060  */
1061
1062 #ifdef IPCONFIG_DYNAMIC
1063
1064 static int __init ic_dynamic(void)
1065 {
1066         int retries;
1067         struct ic_device *d;
1068         unsigned long start_jiffies, timeout, jiff;
1069         int do_bootp = ic_proto_have_if & IC_BOOTP;
1070         int do_rarp = ic_proto_have_if & IC_RARP;
1071
1072         /*
1073          * If none of DHCP/BOOTP/RARP was selected, return with an error.
1074          * This routine gets only called when some pieces of information
1075          * are missing, and without DHCP/BOOTP/RARP we are unable to get it.
1076          */
1077         if (!ic_proto_enabled) {
1078                 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
1079                 return -1;
1080         }
1081
1082 #ifdef IPCONFIG_BOOTP
1083         if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
1084                 printk(KERN_ERR "DHCP/BOOTP: No suitable device found.\n");
1085 #endif
1086 #ifdef IPCONFIG_RARP
1087         if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)
1088                 printk(KERN_ERR "RARP: No suitable device found.\n");
1089 #endif
1090
1091         if (!ic_proto_have_if)
1092                 /* Error message already printed */
1093                 return -1;
1094
1095         /*
1096          * Setup protocols
1097          */
1098 #ifdef IPCONFIG_BOOTP
1099         if (do_bootp)
1100                 ic_bootp_init();
1101 #endif
1102 #ifdef IPCONFIG_RARP
1103         if (do_rarp)
1104                 ic_rarp_init();
1105 #endif
1106
1107         /*
1108          * Send requests and wait, until we get an answer. This loop
1109          * seems to be a terrible waste of CPU time, but actually there is
1110          * only one process running at all, so we don't need to use any
1111          * scheduler functions.
1112          * [Actually we could now, but the nothing else running note still
1113          *  applies.. - AC]
1114          */
1115         printk(KERN_NOTICE "Sending %s%s%s requests .",
1116                do_bootp
1117                 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "",
1118                (do_bootp && do_rarp) ? " and " : "",
1119                do_rarp ? "RARP" : "");
1120
1121         start_jiffies = jiffies;
1122         d = ic_first_dev;
1123         retries = CONF_SEND_RETRIES;
1124         get_random_bytes(&timeout, sizeof(timeout));
1125         timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned) CONF_TIMEOUT_RANDOM);
1126         for (;;) {
1127                 /* Track the device we are configuring */
1128                 ic_dev_xid = d->xid;
1129
1130 #ifdef IPCONFIG_BOOTP
1131                 if (do_bootp && (d->able & IC_BOOTP))
1132                         ic_bootp_send_if(d, jiffies - start_jiffies);
1133 #endif
1134 #ifdef IPCONFIG_RARP
1135                 if (do_rarp && (d->able & IC_RARP))
1136                         ic_rarp_send_if(d);
1137 #endif
1138
1139                 jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout);
1140                 while (time_before(jiffies, jiff) && !ic_got_reply)
1141                         schedule_timeout_uninterruptible(1);
1142 #ifdef IPCONFIG_DHCP
1143                 /* DHCP isn't done until we get a DHCPACK. */
1144                 if ((ic_got_reply & IC_BOOTP)
1145                     && (ic_proto_enabled & IC_USE_DHCP)
1146                     && ic_dhcp_msgtype != DHCPACK)
1147                 {
1148                         ic_got_reply = 0;
1149                         printk(",");
1150                         continue;
1151                 }
1152 #endif /* IPCONFIG_DHCP */
1153
1154                 if (ic_got_reply) {
1155                         printk(" OK\n");
1156                         break;
1157                 }
1158
1159                 if ((d = d->next))
1160                         continue;
1161
1162                 if (! --retries) {
1163                         printk(" timed out!\n");
1164                         break;
1165                 }
1166
1167                 d = ic_first_dev;
1168
1169                 timeout = timeout CONF_TIMEOUT_MULT;
1170                 if (timeout > CONF_TIMEOUT_MAX)
1171                         timeout = CONF_TIMEOUT_MAX;
1172
1173                 printk(".");
1174         }
1175
1176 #ifdef IPCONFIG_BOOTP
1177         if (do_bootp)
1178                 ic_bootp_cleanup();
1179 #endif
1180 #ifdef IPCONFIG_RARP
1181         if (do_rarp)
1182                 ic_rarp_cleanup();
1183 #endif
1184
1185         if (!ic_got_reply) {
1186                 ic_myaddr = NONE;
1187                 return -1;
1188         }
1189
1190         printk("IP-Config: Got %s answer from %pI4, ",
1191                 ((ic_got_reply & IC_RARP) ? "RARP"
1192                  : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),
1193                 &ic_servaddr);
1194         printk("my address is %pI4\n", &ic_myaddr);
1195
1196         return 0;
1197 }
1198
1199 #endif /* IPCONFIG_DYNAMIC */
1200
1201 #ifdef CONFIG_PROC_FS
1202
1203 static int pnp_seq_show(struct seq_file *seq, void *v)
1204 {
1205         int i;
1206
1207         if (ic_proto_used & IC_PROTO)
1208                 seq_printf(seq, "#PROTO: %s\n",
1209                            (ic_proto_used & IC_RARP) ? "RARP"
1210                            : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP");
1211         else
1212                 seq_puts(seq, "#MANUAL\n");
1213
1214         if (ic_domain[0])
1215                 seq_printf(seq,
1216                            "domain %s\n", ic_domain);
1217         for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {
1218                 if (ic_nameservers[i] != NONE)
1219                         seq_printf(seq, "nameserver %pI4\n",
1220                                    &ic_nameservers[i]);
1221         }
1222         if (ic_servaddr != NONE)
1223                 seq_printf(seq, "bootserver %pI4\n",
1224                            &ic_servaddr);
1225         return 0;
1226 }
1227
1228 static int pnp_seq_open(struct inode *indoe, struct file *file)
1229 {
1230         return single_open(file, pnp_seq_show, NULL);
1231 }
1232
1233 static const struct file_operations pnp_seq_fops = {
1234         .owner          = THIS_MODULE,
1235         .open           = pnp_seq_open,
1236         .read           = seq_read,
1237         .llseek         = seq_lseek,
1238         .release        = single_release,
1239 };
1240 #endif /* CONFIG_PROC_FS */
1241
1242 /*
1243  *  Extract IP address from the parameter string if needed. Note that we
1244  *  need to have root_server_addr set _before_ IPConfig gets called as it
1245  *  can override it.
1246  */
1247 __be32 __init root_nfs_parse_addr(char *name)
1248 {
1249         __be32 addr;
1250         int octets = 0;
1251         char *cp, *cq;
1252
1253         cp = cq = name;
1254         while (octets < 4) {
1255                 while (*cp >= '0' && *cp <= '9')
1256                         cp++;
1257                 if (cp == cq || cp - cq > 3)
1258                         break;
1259                 if (*cp == '.' || octets == 3)
1260                         octets++;
1261                 if (octets < 4)
1262                         cp++;
1263                 cq = cp;
1264         }
1265         if (octets == 4 && (*cp == ':' || *cp == '\0')) {
1266                 if (*cp == ':')
1267                         *cp++ = '\0';
1268                 addr = in_aton(name);
1269                 memmove(name, cp, strlen(cp) + 1);
1270         } else
1271                 addr = NONE;
1272
1273         return addr;
1274 }
1275
1276 /*
1277  *      IP Autoconfig dispatcher.
1278  */
1279
1280 static int __init ip_auto_config(void)
1281 {
1282         __be32 addr;
1283 #ifdef IPCONFIG_DYNAMIC
1284         int retries = CONF_OPEN_RETRIES;
1285 #endif
1286
1287 #ifdef CONFIG_PROC_FS
1288         proc_net_fops_create(&init_net, "pnp", S_IRUGO, &pnp_seq_fops);
1289 #endif /* CONFIG_PROC_FS */
1290
1291         if (!ic_enable)
1292                 return 0;
1293
1294         DBG(("IP-Config: Entered.\n"));
1295 #ifdef IPCONFIG_DYNAMIC
1296  try_try_again:
1297 #endif
1298         /* Give hardware a chance to settle */
1299         msleep(CONF_PRE_OPEN);
1300
1301         /* Setup all network devices */
1302         if (ic_open_devs() < 0)
1303                 return -1;
1304
1305         /* Give drivers a chance to settle */
1306         ssleep(CONF_POST_OPEN);
1307
1308         /*
1309          * If the config information is insufficient (e.g., our IP address or
1310          * IP address of the boot server is missing or we have multiple network
1311          * interfaces and no default was set), use BOOTP or RARP to get the
1312          * missing values.
1313          */
1314         if (ic_myaddr == NONE ||
1315 #ifdef CONFIG_ROOT_NFS
1316             (root_server_addr == NONE
1317              && ic_servaddr == NONE
1318              && ROOT_DEV == Root_NFS) ||
1319 #endif
1320             ic_first_dev->next) {
1321 #ifdef IPCONFIG_DYNAMIC
1322                 if (ic_dynamic() < 0) {
1323                         ic_close_devs();
1324
1325                         /*
1326                          * I don't know why, but sometimes the
1327                          * eepro100 driver (at least) gets upset and
1328                          * doesn't work the first time it's opened.
1329                          * But then if you close it and reopen it, it
1330                          * works just fine.  So we need to try that at
1331                          * least once before giving up.
1332                          *
1333                          * Also, if the root will be NFS-mounted, we
1334                          * have nowhere to go if DHCP fails.  So we
1335                          * just have to keep trying forever.
1336                          *
1337                          *                              -- Chip
1338                          */
1339 #ifdef CONFIG_ROOT_NFS
1340                         if (ROOT_DEV ==  Root_NFS) {
1341                                 printk(KERN_ERR
1342                                         "IP-Config: Retrying forever (NFS root)...\n");
1343                                 goto try_try_again;
1344                         }
1345 #endif
1346
1347                         if (--retries) {
1348                                 printk(KERN_ERR
1349                                        "IP-Config: Reopening network devices...\n");
1350                                 goto try_try_again;
1351                         }
1352
1353                         /* Oh, well.  At least we tried. */
1354                         printk(KERN_ERR "IP-Config: Auto-configuration of network failed.\n");
1355                         return -1;
1356                 }
1357 #else /* !DYNAMIC */
1358                 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
1359                 ic_close_devs();
1360                 return -1;
1361 #endif /* IPCONFIG_DYNAMIC */
1362         } else {
1363                 /* Device selected manually or only one device -> use it */
1364                 ic_dev = ic_first_dev->dev;
1365         }
1366
1367         addr = root_nfs_parse_addr(root_server_path);
1368         if (root_server_addr == NONE)
1369                 root_server_addr = addr;
1370
1371         /*
1372          * Use defaults whereever applicable.
1373          */
1374         if (ic_defaults() < 0)
1375                 return -1;
1376
1377         /*
1378          * Close all network devices except the device we've
1379          * autoconfigured and set up routes.
1380          */
1381         ic_close_devs();
1382         if (ic_setup_if() < 0 || ic_setup_routes() < 0)
1383                 return -1;
1384
1385         /*
1386          * Record which protocol was actually used.
1387          */
1388 #ifdef IPCONFIG_DYNAMIC
1389         ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP);
1390 #endif
1391
1392 #ifndef IPCONFIG_SILENT
1393         /*
1394          * Clue in the operator.
1395          */
1396         printk("IP-Config: Complete:");
1397         printk("\n     device=%s", ic_dev->name);
1398         printk(", addr=%pI4", &ic_myaddr);
1399         printk(", mask=%pI4", &ic_netmask);
1400         printk(", gw=%pI4", &ic_gateway);
1401         printk(",\n     host=%s, domain=%s, nis-domain=%s",
1402                utsname()->nodename, ic_domain, utsname()->domainname);
1403         printk(",\n     bootserver=%pI4", &ic_servaddr);
1404         printk(", rootserver=%pI4", &root_server_addr);
1405         printk(", rootpath=%s", root_server_path);
1406         printk("\n");
1407 #endif /* !SILENT */
1408
1409         return 0;
1410 }
1411
1412 late_initcall(ip_auto_config);
1413
1414
1415 /*
1416  *  Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
1417  *  command line parameter.  See Documentation/filesystems/nfsroot.txt.
1418  */
1419 static int __init ic_proto_name(char *name)
1420 {
1421         if (!strcmp(name, "on") || !strcmp(name, "any")) {
1422                 return 1;
1423         }
1424         if (!strcmp(name, "off") || !strcmp(name, "none")) {
1425                 return 0;
1426         }
1427 #ifdef CONFIG_IP_PNP_DHCP
1428         else if (!strcmp(name, "dhcp")) {
1429                 ic_proto_enabled &= ~IC_RARP;
1430                 return 1;
1431         }
1432 #endif
1433 #ifdef CONFIG_IP_PNP_BOOTP
1434         else if (!strcmp(name, "bootp")) {
1435                 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP);
1436                 return 1;
1437         }
1438 #endif
1439 #ifdef CONFIG_IP_PNP_RARP
1440         else if (!strcmp(name, "rarp")) {
1441                 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP);
1442                 return 1;
1443         }
1444 #endif
1445 #ifdef IPCONFIG_DYNAMIC
1446         else if (!strcmp(name, "both")) {
1447                 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */
1448                 return 1;
1449         }
1450 #endif
1451         return 0;
1452 }
1453
1454 static int __init ip_auto_config_setup(char *addrs)
1455 {
1456         char *cp, *ip, *dp;
1457         int num = 0;
1458
1459         ic_set_manually = 1;
1460         ic_enable = 1;
1461
1462         /*
1463          * If any dhcp, bootp etc options are set, leave autoconfig on
1464          * and skip the below static IP processing.
1465          */
1466         if (ic_proto_name(addrs))
1467                 return 1;
1468
1469         /* If no static IP is given, turn off autoconfig and bail.  */
1470         if (*addrs == 0 ||
1471             strcmp(addrs, "off") == 0 ||
1472             strcmp(addrs, "none") == 0) {
1473                 ic_enable = 0;
1474                 return 1;
1475         }
1476
1477         /* Parse string for static IP assignment.  */
1478         ip = addrs;
1479         while (ip && *ip) {
1480                 if ((cp = strchr(ip, ':')))
1481                         *cp++ = '\0';
1482                 if (strlen(ip) > 0) {
1483                         DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip));
1484                         switch (num) {
1485                         case 0:
1486                                 if ((ic_myaddr = in_aton(ip)) == ANY)
1487                                         ic_myaddr = NONE;
1488                                 break;
1489                         case 1:
1490                                 if ((ic_servaddr = in_aton(ip)) == ANY)
1491                                         ic_servaddr = NONE;
1492                                 break;
1493                         case 2:
1494                                 if ((ic_gateway = in_aton(ip)) == ANY)
1495                                         ic_gateway = NONE;
1496                                 break;
1497                         case 3:
1498                                 if ((ic_netmask = in_aton(ip)) == ANY)
1499                                         ic_netmask = NONE;
1500                                 break;
1501                         case 4:
1502                                 if ((dp = strchr(ip, '.'))) {
1503                                         *dp++ = '\0';
1504                                         strlcpy(utsname()->domainname, dp,
1505                                                 sizeof(utsname()->domainname));
1506                                 }
1507                                 strlcpy(utsname()->nodename, ip,
1508                                         sizeof(utsname()->nodename));
1509                                 ic_host_name_set = 1;
1510                                 break;
1511                         case 5:
1512                                 strlcpy(user_dev_name, ip, sizeof(user_dev_name));
1513                                 break;
1514                         case 6:
1515                                 if (ic_proto_name(ip) == 0 &&
1516                                     ic_myaddr == NONE) {
1517                                         ic_enable = 0;
1518                                 }
1519                                 break;
1520                         }
1521                 }
1522                 ip = cp;
1523                 num++;
1524         }
1525
1526         return 1;
1527 }
1528
1529 static int __init nfsaddrs_config_setup(char *addrs)
1530 {
1531         return ip_auto_config_setup(addrs);
1532 }
1533
1534 static int __init vendor_class_identifier_setup(char *addrs)
1535 {
1536         if (strlcpy(vendor_class_identifier, addrs,
1537                     sizeof(vendor_class_identifier))
1538             >= sizeof(vendor_class_identifier))
1539                 printk(KERN_WARNING "DHCP: vendorclass too long, truncated to \"%s\"",
1540                        vendor_class_identifier);
1541         return 1;
1542 }
1543
1544 __setup("ip=", ip_auto_config_setup);
1545 __setup("nfsaddrs=", nfsaddrs_config_setup);
1546 __setup("dhcpclass=", vendor_class_identifier_setup);