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