[IPV4]: net/ipv4/ipconfig.c should #include <linux/nfs_fs.h>
[linux-2.6.git] / net / ipv4 / ipconfig.c
1 /*
2  *  $Id: ipconfig.c,v 1.46 2002/02/01 22:01:04 davem Exp $
3  *
4  *  Automatic Configuration of IP -- use DHCP, BOOTP, RARP, or
5  *  user-supplied information to configure own IP address and routes.
6  *
7  *  Copyright (C) 1996-1998 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
8  *
9  *  Derived from network configuration code in fs/nfs/nfsroot.c,
10  *  originally Copyright (C) 1995, 1996 Gero Kuhlmann and me.
11  *
12  *  BOOTP rewritten to construct and analyse packets itself instead
13  *  of misusing the IP layer. num_bugs_causing_wrong_arp_replies--;
14  *                                           -- MJ, December 1998
15  *  
16  *  Fixed ip_auto_config_setup calling at startup in the new "Linker Magic"
17  *  initialization scheme.
18  *      - Arnaldo Carvalho de Melo <acme@conectiva.com.br>, 08/11/1999
19  *
20  *  DHCP support added.  To users this looks like a whole separate
21  *  protocol, but we know it's just a bag on the side of BOOTP.
22  *              -- Chip Salzenberg <chip@valinux.com>, May 2000
23  *
24  *  Ported DHCP support from 2.2.16 to 2.4.0-test4
25  *              -- Eric Biederman <ebiederman@lnxi.com>, 30 Aug 2000
26  *
27  *  Merged changes from 2.2.19 into 2.4.3
28  *              -- Eric Biederman <ebiederman@lnxi.com>, 22 April Aug 2001
29  *
30  *  Multiple Nameservers in /proc/net/pnp
31  *              --  Josef Siemes <jsiemes@web.de>, Aug 2002
32  */
33
34 #include <linux/config.h>
35 #include <linux/types.h>
36 #include <linux/string.h>
37 #include <linux/kernel.h>
38 #include <linux/jiffies.h>
39 #include <linux/random.h>
40 #include <linux/init.h>
41 #include <linux/utsname.h>
42 #include <linux/in.h>
43 #include <linux/if.h>
44 #include <linux/inet.h>
45 #include <linux/netdevice.h>
46 #include <linux/if_arp.h>
47 #include <linux/skbuff.h>
48 #include <linux/ip.h>
49 #include <linux/socket.h>
50 #include <linux/route.h>
51 #include <linux/udp.h>
52 #include <linux/proc_fs.h>
53 #include <linux/seq_file.h>
54 #include <linux/major.h>
55 #include <linux/root_dev.h>
56 #include <linux/delay.h>
57 #include <linux/nfs_fs.h>
58 #include <net/arp.h>
59 #include <net/ip.h>
60 #include <net/ipconfig.h>
61
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
104 /*
105  * Public IP configuration
106  */
107
108 /* This is used by platforms which might be able to set the ipconfig
109  * variables using firmware environment vars.  If this is set, it will
110  * ignore such firmware variables.
111  */
112 int ic_set_manually __initdata = 0;             /* IPconfig parameters set manually */
113
114 static int ic_enable __initdata = 0;            /* IP config enabled? */
115
116 /* Protocol choice */
117 int ic_proto_enabled __initdata = 0
118 #ifdef IPCONFIG_BOOTP
119                         | IC_BOOTP
120 #endif
121 #ifdef CONFIG_IP_PNP_DHCP
122                         | IC_USE_DHCP
123 #endif
124 #ifdef IPCONFIG_RARP
125                         | IC_RARP
126 #endif
127                         ;
128
129 static int ic_host_name_set __initdata = 0;     /* Host name set by us? */
130
131 u32 ic_myaddr = INADDR_NONE;            /* My IP address */
132 static u32 ic_netmask = INADDR_NONE;    /* Netmask for local subnet */
133 u32 ic_gateway = INADDR_NONE;   /* Gateway IP address */
134
135 u32 ic_servaddr = INADDR_NONE;  /* Boot server IP address */
136
137 u32 root_server_addr = INADDR_NONE;     /* Address of NFS server */
138 u8 root_server_path[256] = { 0, };      /* Path to mount as root */
139
140 /* Persistent data: */
141
142 static int ic_proto_used;                       /* Protocol used, if any */
143 static u32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */
144 static u8 ic_domain[64];                /* DNS (not NIS) domain name */
145
146 /*
147  * Private state.
148  */
149
150 /* Name of user-selected boot device */
151 static char user_dev_name[IFNAMSIZ] __initdata = { 0, };
152
153 /* Protocols supported by available interfaces */
154 static int ic_proto_have_if __initdata = 0;
155
156 #ifdef IPCONFIG_DYNAMIC
157 static DEFINE_SPINLOCK(ic_recv_lock);
158 static volatile int ic_got_reply __initdata = 0;    /* Proto(s) that replied */
159 #endif
160 #ifdef IPCONFIG_DHCP
161 static int ic_dhcp_msgtype __initdata = 0;      /* DHCP msg type received */
162 #endif
163
164
165 /*
166  *      Network devices
167  */
168
169 struct ic_device {
170         struct ic_device *next;
171         struct net_device *dev;
172         unsigned short flags;
173         short able;
174         u32 xid;
175 };
176
177 static struct ic_device *ic_first_dev __initdata = NULL;/* List of open device */
178 static struct net_device *ic_dev __initdata = NULL;     /* Selected device */
179
180 static int __init ic_open_devs(void)
181 {
182         struct ic_device *d, **last;
183         struct net_device *dev;
184         unsigned short oflags;
185
186         last = &ic_first_dev;
187         rtnl_shlock();
188
189         /* bring loopback device up first */
190         if (dev_change_flags(&loopback_dev, loopback_dev.flags | IFF_UP) < 0)
191                 printk(KERN_ERR "IP-Config: Failed to open %s\n", loopback_dev.name);
192
193         for (dev = dev_base; dev; dev = dev->next) {
194                 if (dev == &loopback_dev)
195                         continue;
196                 if (user_dev_name[0] ? !strcmp(dev->name, user_dev_name) :
197                     (!(dev->flags & IFF_LOOPBACK) &&
198                      (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) &&
199                      strncmp(dev->name, "dummy", 5))) {
200                         int able = 0;
201                         if (dev->mtu >= 364)
202                                 able |= IC_BOOTP;
203                         else
204                                 printk(KERN_WARNING "DHCP/BOOTP: Ignoring device %s, MTU %d too small", dev->name, dev->mtu);
205                         if (!(dev->flags & IFF_NOARP))
206                                 able |= IC_RARP;
207                         able &= ic_proto_enabled;
208                         if (ic_proto_enabled && !able)
209                                 continue;
210                         oflags = dev->flags;
211                         if (dev_change_flags(dev, oflags | IFF_UP) < 0) {
212                                 printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name);
213                                 continue;
214                         }
215                         if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) {
216                                 rtnl_shunlock();
217                                 return -1;
218                         }
219                         d->dev = dev;
220                         *last = d;
221                         last = &d->next;
222                         d->flags = oflags;
223                         d->able = able;
224                         if (able & IC_BOOTP)
225                                 get_random_bytes(&d->xid, sizeof(u32));
226                         else
227                                 d->xid = 0;
228                         ic_proto_have_if |= able;
229                         DBG(("IP-Config: %s UP (able=%d, xid=%08x)\n",
230                                 dev->name, able, d->xid));
231                 }
232         }
233         rtnl_shunlock();
234
235         *last = NULL;
236
237         if (!ic_first_dev) {
238                 if (user_dev_name[0])
239                         printk(KERN_ERR "IP-Config: Device `%s' not found.\n", user_dev_name);
240                 else
241                         printk(KERN_ERR "IP-Config: No network devices available.\n");
242                 return -1;
243         }
244         return 0;
245 }
246
247 static void __init ic_close_devs(void)
248 {
249         struct ic_device *d, *next;
250         struct net_device *dev;
251
252         rtnl_shlock();
253         next = ic_first_dev;
254         while ((d = next)) {
255                 next = d->next;
256                 dev = d->dev;
257                 if (dev != ic_dev) {
258                         DBG(("IP-Config: Downing %s\n", dev->name));
259                         dev_change_flags(dev, d->flags);
260                 }
261                 kfree(d);
262         }
263         rtnl_shunlock();
264 }
265
266 /*
267  *      Interface to various network functions.
268  */
269
270 static inline void
271 set_sockaddr(struct sockaddr_in *sin, u32 addr, u16 port)
272 {
273         sin->sin_family = AF_INET;
274         sin->sin_addr.s_addr = addr;
275         sin->sin_port = port;
276 }
277
278 static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg)
279 {
280         int res;
281
282         mm_segment_t oldfs = get_fs();
283         set_fs(get_ds());
284         res = devinet_ioctl(cmd, (struct ifreq __user *) arg);
285         set_fs(oldfs);
286         return res;
287 }
288
289 static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg)
290 {
291         int res;
292
293         mm_segment_t oldfs = get_fs();
294         set_fs(get_ds());
295         res = ip_rt_ioctl(cmd, (void __user *) arg);
296         set_fs(oldfs);
297         return res;
298 }
299
300 /*
301  *      Set up interface addresses and routes.
302  */
303
304 static int __init ic_setup_if(void)
305 {
306         struct ifreq ir;
307         struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr;
308         int err;
309
310         memset(&ir, 0, sizeof(ir));
311         strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name);
312         set_sockaddr(sin, ic_myaddr, 0);
313         if ((err = ic_dev_ioctl(SIOCSIFADDR, &ir)) < 0) {
314                 printk(KERN_ERR "IP-Config: Unable to set interface address (%d).\n", err);
315                 return -1;
316         }
317         set_sockaddr(sin, ic_netmask, 0);
318         if ((err = ic_dev_ioctl(SIOCSIFNETMASK, &ir)) < 0) {
319                 printk(KERN_ERR "IP-Config: Unable to set interface netmask (%d).\n", err);
320                 return -1;
321         }
322         set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0);
323         if ((err = ic_dev_ioctl(SIOCSIFBRDADDR, &ir)) < 0) {
324                 printk(KERN_ERR "IP-Config: Unable to set interface broadcast address (%d).\n", err);
325                 return -1;
326         }
327         return 0;
328 }
329
330 static int __init ic_setup_routes(void)
331 {
332         /* No need to setup device routes, only the default route... */
333
334         if (ic_gateway != INADDR_NONE) {
335                 struct rtentry rm;
336                 int err;
337
338                 memset(&rm, 0, sizeof(rm));
339                 if ((ic_gateway ^ ic_myaddr) & ic_netmask) {
340                         printk(KERN_ERR "IP-Config: Gateway not on directly connected network.\n");
341                         return -1;
342                 }
343                 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0);
344                 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0);
345                 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0);
346                 rm.rt_flags = RTF_UP | RTF_GATEWAY;
347                 if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) {
348                         printk(KERN_ERR "IP-Config: Cannot add default route (%d).\n", err);
349                         return -1;
350                 }
351         }
352
353         return 0;
354 }
355
356 /*
357  *      Fill in default values for all missing parameters.
358  */
359
360 static int __init ic_defaults(void)
361 {
362         /*
363          *      At this point we have no userspace running so need not
364          *      claim locks on system_utsname
365          */
366          
367         if (!ic_host_name_set)
368                 sprintf(system_utsname.nodename, "%u.%u.%u.%u", NIPQUAD(ic_myaddr));
369
370         if (root_server_addr == INADDR_NONE)
371                 root_server_addr = ic_servaddr;
372
373         if (ic_netmask == INADDR_NONE) {
374                 if (IN_CLASSA(ntohl(ic_myaddr)))
375                         ic_netmask = htonl(IN_CLASSA_NET);
376                 else if (IN_CLASSB(ntohl(ic_myaddr)))
377                         ic_netmask = htonl(IN_CLASSB_NET);
378                 else if (IN_CLASSC(ntohl(ic_myaddr)))
379                         ic_netmask = htonl(IN_CLASSC_NET);
380                 else {
381                         printk(KERN_ERR "IP-Config: Unable to guess netmask for address %u.%u.%u.%u\n",
382                                 NIPQUAD(ic_myaddr));
383                         return -1;
384                 }
385                 printk("IP-Config: Guessing netmask %u.%u.%u.%u\n", NIPQUAD(ic_netmask));
386         }
387
388         return 0;
389 }
390
391 /*
392  *      RARP support.
393  */
394
395 #ifdef IPCONFIG_RARP
396
397 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
398
399 static struct packet_type rarp_packet_type __initdata = {
400         .type = __constant_htons(ETH_P_RARP),
401         .func = ic_rarp_recv,
402 };
403
404 static inline void ic_rarp_init(void)
405 {
406         dev_add_pack(&rarp_packet_type);
407 }
408
409 static inline void ic_rarp_cleanup(void)
410 {
411         dev_remove_pack(&rarp_packet_type);
412 }
413
414 /*
415  *  Process received RARP packet.
416  */
417 static int __init
418 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
419 {
420         struct arphdr *rarp;
421         unsigned char *rarp_ptr;
422         unsigned long sip, tip;
423         unsigned char *sha, *tha;               /* s for "source", t for "target" */
424         struct ic_device *d;
425
426         if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
427                 return NET_RX_DROP;
428
429         if (!pskb_may_pull(skb, sizeof(struct arphdr)))
430                 goto drop;
431
432         /* Basic sanity checks can be done without the lock.  */
433         rarp = (struct arphdr *)skb->h.raw;
434
435         /* If this test doesn't pass, it's not IP, or we should
436          * ignore it anyway.
437          */
438         if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd))
439                 goto drop;
440
441         /* If it's not a RARP reply, delete it. */
442         if (rarp->ar_op != htons(ARPOP_RREPLY))
443                 goto drop;
444
445         /* If it's not Ethernet, delete it. */
446         if (rarp->ar_pro != htons(ETH_P_IP))
447                 goto drop;
448
449         if (!pskb_may_pull(skb,
450                            sizeof(struct arphdr) +
451                            (2 * dev->addr_len) +
452                            (2 * 4)))
453                 goto drop;
454
455         /* OK, it is all there and looks valid, process... */
456         rarp = (struct arphdr *)skb->h.raw;
457         rarp_ptr = (unsigned char *) (rarp + 1);
458
459         /* One reply at a time, please. */
460         spin_lock(&ic_recv_lock);
461
462         /* If we already have a reply, just drop the packet */
463         if (ic_got_reply)
464                 goto drop_unlock;
465
466         /* Find the ic_device that the packet arrived on */
467         d = ic_first_dev;
468         while (d && d->dev != dev)
469                 d = d->next;
470         if (!d)
471                 goto drop_unlock;       /* should never happen */
472
473         /* Extract variable-width fields */
474         sha = rarp_ptr;
475         rarp_ptr += dev->addr_len;
476         memcpy(&sip, rarp_ptr, 4);
477         rarp_ptr += 4;
478         tha = rarp_ptr;
479         rarp_ptr += dev->addr_len;
480         memcpy(&tip, rarp_ptr, 4);
481
482         /* Discard packets which are not meant for us. */
483         if (memcmp(tha, dev->dev_addr, dev->addr_len))
484                 goto drop_unlock;
485
486         /* Discard packets which are not from specified server. */
487         if (ic_servaddr != INADDR_NONE && ic_servaddr != sip)
488                 goto drop_unlock;
489
490         /* We have a winner! */
491         ic_dev = dev;
492         if (ic_myaddr == INADDR_NONE)
493                 ic_myaddr = tip;
494         ic_servaddr = sip;
495         ic_got_reply = IC_RARP;
496
497 drop_unlock:
498         /* Show's over.  Nothing to see here.  */
499         spin_unlock(&ic_recv_lock);
500
501 drop:
502         /* Throw the packet out. */
503         kfree_skb(skb);
504         return 0;
505 }
506
507
508 /*
509  *  Send RARP request packet over a single interface.
510  */
511 static void __init ic_rarp_send_if(struct ic_device *d)
512 {
513         struct net_device *dev = d->dev;
514         arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL,
515                  dev->dev_addr, dev->dev_addr);
516 }
517 #endif
518
519 /*
520  *      DHCP/BOOTP support.
521  */
522
523 #ifdef IPCONFIG_BOOTP
524
525 struct bootp_pkt {              /* BOOTP packet format */
526         struct iphdr iph;       /* IP header */
527         struct udphdr udph;     /* UDP header */
528         u8 op;                  /* 1=request, 2=reply */
529         u8 htype;               /* HW address type */
530         u8 hlen;                /* HW address length */
531         u8 hops;                /* Used only by gateways */
532         u32 xid;                /* Transaction ID */
533         u16 secs;               /* Seconds since we started */
534         u16 flags;              /* Just what it says */
535         u32 client_ip;          /* Client's IP address if known */
536         u32 your_ip;            /* Assigned IP address */
537         u32 server_ip;          /* (Next, e.g. NFS) Server's IP address */
538         u32 relay_ip;           /* IP address of BOOTP relay */
539         u8 hw_addr[16];         /* Client's HW address */
540         u8 serv_name[64];       /* Server host name */
541         u8 boot_file[128];      /* Name of boot file */
542         u8 exten[312];          /* DHCP options / BOOTP vendor extensions */
543 };
544
545 /* packet ops */
546 #define BOOTP_REQUEST   1
547 #define BOOTP_REPLY     2
548
549 /* DHCP message types */
550 #define DHCPDISCOVER    1
551 #define DHCPOFFER       2
552 #define DHCPREQUEST     3
553 #define DHCPDECLINE     4
554 #define DHCPACK         5
555 #define DHCPNAK         6
556 #define DHCPRELEASE     7
557 #define DHCPINFORM      8
558
559 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
560
561 static struct packet_type bootp_packet_type __initdata = {
562         .type = __constant_htons(ETH_P_IP),
563         .func = ic_bootp_recv,
564 };
565
566
567 /*
568  *  Initialize DHCP/BOOTP extension fields in the request.
569  */
570
571 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 };
572
573 #ifdef IPCONFIG_DHCP
574
575 static void __init
576 ic_dhcp_init_options(u8 *options)
577 {
578         u8 mt = ((ic_servaddr == INADDR_NONE)
579                  ? DHCPDISCOVER : DHCPREQUEST);
580         u8 *e = options;
581
582 #ifdef IPCONFIG_DEBUG
583         printk("DHCP: Sending message type %d\n", mt);
584 #endif
585
586         memcpy(e, ic_bootp_cookie, 4);  /* RFC1048 Magic Cookie */
587         e += 4;
588
589         *e++ = 53;              /* DHCP message type */
590         *e++ = 1;
591         *e++ = mt;
592
593         if (mt == DHCPREQUEST) {
594                 *e++ = 54;      /* Server ID (IP address) */
595                 *e++ = 4;
596                 memcpy(e, &ic_servaddr, 4);
597                 e += 4;
598
599                 *e++ = 50;      /* Requested IP address */
600                 *e++ = 4;
601                 memcpy(e, &ic_myaddr, 4);
602                 e += 4;
603         }
604
605         /* always? */
606         {
607                 static const u8 ic_req_params[] = {
608                         1,      /* Subnet mask */
609                         3,      /* Default gateway */
610                         6,      /* DNS server */
611                         12,     /* Host name */
612                         15,     /* Domain name */
613                         17,     /* Boot path */
614                         40,     /* NIS domain name */
615                 };
616
617                 *e++ = 55;      /* Parameter request list */
618                 *e++ = sizeof(ic_req_params);
619                 memcpy(e, ic_req_params, sizeof(ic_req_params));
620                 e += sizeof(ic_req_params);
621         }
622
623         *e++ = 255;     /* End of the list */
624 }
625
626 #endif /* IPCONFIG_DHCP */
627
628 static void __init ic_bootp_init_ext(u8 *e)
629 {
630         memcpy(e, ic_bootp_cookie, 4);  /* RFC1048 Magic Cookie */
631         e += 4;
632         *e++ = 1;               /* Subnet mask request */
633         *e++ = 4;
634         e += 4;
635         *e++ = 3;               /* Default gateway request */
636         *e++ = 4;
637         e += 4;
638         *e++ = 5;               /* Name server request */
639         *e++ = 8;
640         e += 8;
641         *e++ = 12;              /* Host name request */
642         *e++ = 32;
643         e += 32;
644         *e++ = 40;              /* NIS Domain name request */
645         *e++ = 32;
646         e += 32;
647         *e++ = 17;              /* Boot path */
648         *e++ = 40;
649         e += 40;
650
651         *e++ = 57;              /* set extension buffer size for reply */ 
652         *e++ = 2;
653         *e++ = 1;               /* 128+236+8+20+14, see dhcpd sources */ 
654         *e++ = 150;
655
656         *e++ = 255;             /* End of the list */
657 }
658
659
660 /*
661  *  Initialize the DHCP/BOOTP mechanism.
662  */
663 static inline void ic_bootp_init(void)
664 {
665         int i;
666
667         for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
668                 ic_nameservers[i] = INADDR_NONE;
669
670         dev_add_pack(&bootp_packet_type);
671 }
672
673
674 /*
675  *  DHCP/BOOTP cleanup.
676  */
677 static inline void ic_bootp_cleanup(void)
678 {
679         dev_remove_pack(&bootp_packet_type);
680 }
681
682
683 /*
684  *  Send DHCP/BOOTP request to single interface.
685  */
686 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff)
687 {
688         struct net_device *dev = d->dev;
689         struct sk_buff *skb;
690         struct bootp_pkt *b;
691         int hh_len = LL_RESERVED_SPACE(dev);
692         struct iphdr *h;
693
694         /* Allocate packet */
695         skb = alloc_skb(sizeof(struct bootp_pkt) + hh_len + 15, GFP_KERNEL);
696         if (!skb)
697                 return;
698         skb_reserve(skb, hh_len);
699         b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt));
700         memset(b, 0, sizeof(struct bootp_pkt));
701
702         /* Construct IP header */
703         skb->nh.iph = h = &b->iph;
704         h->version = 4;
705         h->ihl = 5;
706         h->tot_len = htons(sizeof(struct bootp_pkt));
707         h->frag_off = htons(IP_DF);
708         h->ttl = 64;
709         h->protocol = IPPROTO_UDP;
710         h->daddr = INADDR_BROADCAST;
711         h->check = ip_fast_csum((unsigned char *) h, h->ihl);
712
713         /* Construct UDP header */
714         b->udph.source = htons(68);
715         b->udph.dest = htons(67);
716         b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr));
717         /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */
718
719         /* Construct DHCP/BOOTP header */
720         b->op = BOOTP_REQUEST;
721         if (dev->type < 256) /* check for false types */
722                 b->htype = dev->type;
723         else if (dev->type == ARPHRD_IEEE802_TR) /* fix for token ring */
724                 b->htype = ARPHRD_IEEE802;
725         else if (dev->type == ARPHRD_FDDI)
726                 b->htype = ARPHRD_ETHER;
727         else {
728                 printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name);
729                 b->htype = dev->type; /* can cause undefined behavior */
730         }
731         b->hlen = dev->addr_len;
732         b->your_ip = INADDR_NONE;
733         b->server_ip = INADDR_NONE;
734         memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
735         b->secs = htons(jiffies_diff / HZ);
736         b->xid = d->xid;
737
738         /* add DHCP options or BOOTP extensions */
739 #ifdef IPCONFIG_DHCP
740         if (ic_proto_enabled & IC_USE_DHCP)
741                 ic_dhcp_init_options(b->exten);
742         else
743 #endif
744                 ic_bootp_init_ext(b->exten);
745
746         /* Chain packet down the line... */
747         skb->dev = dev;
748         skb->protocol = htons(ETH_P_IP);
749         if ((dev->hard_header &&
750              dev->hard_header(skb, dev, ntohs(skb->protocol), dev->broadcast, dev->dev_addr, skb->len) < 0) ||
751             dev_queue_xmit(skb) < 0)
752                 printk("E");
753 }
754
755
756 /*
757  *  Copy BOOTP-supplied string if not already set.
758  */
759 static int __init ic_bootp_string(char *dest, char *src, int len, int max)
760 {
761         if (!len)
762                 return 0;
763         if (len > max-1)
764                 len = max-1;
765         memcpy(dest, src, len);
766         dest[len] = '\0';
767         return 1;
768 }
769
770
771 /*
772  *  Process BOOTP extensions.
773  */
774 static void __init ic_do_bootp_ext(u8 *ext)
775 {
776        u8 servers;
777        int i;
778
779 #ifdef IPCONFIG_DEBUG
780         u8 *c;
781
782         printk("DHCP/BOOTP: Got extension %d:",*ext);
783         for(c=ext+2; c<ext+2+ext[1]; c++)
784                 printk(" %02x", *c);
785         printk("\n");
786 #endif
787
788         switch (*ext++) {
789                 case 1:         /* Subnet mask */
790                         if (ic_netmask == INADDR_NONE)
791                                 memcpy(&ic_netmask, ext+1, 4);
792                         break;
793                 case 3:         /* Default gateway */
794                         if (ic_gateway == INADDR_NONE)
795                                 memcpy(&ic_gateway, ext+1, 4);
796                         break;
797                 case 6:         /* DNS server */
798                         servers= *ext/4;
799                         if (servers > CONF_NAMESERVERS_MAX)
800                                 servers = CONF_NAMESERVERS_MAX;
801                         for (i = 0; i < servers; i++) {
802                                 if (ic_nameservers[i] == INADDR_NONE)
803                                         memcpy(&ic_nameservers[i], ext+1+4*i, 4);
804                         }
805                         break;
806                 case 12:        /* Host name */
807                         ic_bootp_string(system_utsname.nodename, ext+1, *ext, __NEW_UTS_LEN);
808                         ic_host_name_set = 1;
809                         break;
810                 case 15:        /* Domain name (DNS) */
811                         ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
812                         break;
813                 case 17:        /* Root path */
814                         if (!root_server_path[0])
815                                 ic_bootp_string(root_server_path, ext+1, *ext, sizeof(root_server_path));
816                         break;
817                 case 40:        /* NIS Domain name (_not_ DNS) */
818                         ic_bootp_string(system_utsname.domainname, ext+1, *ext, __NEW_UTS_LEN);
819                         break;
820         }
821 }
822
823
824 /*
825  *  Receive BOOTP reply.
826  */
827 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
828 {
829         struct bootp_pkt *b;
830         struct iphdr *h;
831         struct ic_device *d;
832         int len, ext_len;
833
834         /* Perform verifications before taking the lock.  */
835         if (skb->pkt_type == PACKET_OTHERHOST)
836                 goto drop;
837
838         if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
839                 return NET_RX_DROP;
840
841         if (!pskb_may_pull(skb,
842                            sizeof(struct iphdr) +
843                            sizeof(struct udphdr)))
844                 goto drop;
845
846         b = (struct bootp_pkt *) skb->nh.iph;
847         h = &b->iph;
848
849         if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP)
850                 goto drop;
851
852         /* Fragments are not supported */
853         if (h->frag_off & htons(IP_OFFSET | IP_MF)) {
854                 if (net_ratelimit())
855                         printk(KERN_ERR "DHCP/BOOTP: Ignoring fragmented "
856                                "reply.\n");
857                 goto drop;
858         }
859
860         if (skb->len < ntohs(h->tot_len))
861                 goto drop;
862
863         if (ip_fast_csum((char *) h, h->ihl))
864                 goto drop;
865
866         if (b->udph.source != htons(67) || b->udph.dest != htons(68))
867                 goto drop;
868
869         if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
870                 goto drop;
871
872         len = ntohs(b->udph.len) - sizeof(struct udphdr);
873         ext_len = len - (sizeof(*b) -
874                          sizeof(struct iphdr) -
875                          sizeof(struct udphdr) -
876                          sizeof(b->exten));
877         if (ext_len < 0)
878                 goto drop;
879
880         /* Ok the front looks good, make sure we can get at the rest.  */
881         if (!pskb_may_pull(skb, skb->len))
882                 goto drop;
883
884         b = (struct bootp_pkt *) skb->nh.iph;
885         h = &b->iph;
886
887         /* One reply at a time, please. */
888         spin_lock(&ic_recv_lock);
889
890         /* If we already have a reply, just drop the packet */
891         if (ic_got_reply)
892                 goto drop_unlock;
893
894         /* Find the ic_device that the packet arrived on */
895         d = ic_first_dev;
896         while (d && d->dev != dev)
897                 d = d->next;
898         if (!d)
899                 goto drop_unlock;  /* should never happen */
900
901         /* Is it a reply to our BOOTP request? */
902         if (b->op != BOOTP_REPLY ||
903             b->xid != d->xid) {
904                 if (net_ratelimit())
905                         printk(KERN_ERR "DHCP/BOOTP: Reply not for us, "
906                                "op[%x] xid[%x]\n",
907                                b->op, b->xid);
908                 goto drop_unlock;
909         }
910
911         /* Parse extensions */
912         if (ext_len >= 4 &&
913             !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */
914                 u8 *end = (u8 *) b + ntohs(b->iph.tot_len);
915                 u8 *ext;
916
917 #ifdef IPCONFIG_DHCP
918                 if (ic_proto_enabled & IC_USE_DHCP) {
919                         u32 server_id = INADDR_NONE;
920                         int mt = 0;
921
922                         ext = &b->exten[4];
923                         while (ext < end && *ext != 0xff) {
924                                 u8 *opt = ext++;
925                                 if (*opt == 0)  /* Padding */
926                                         continue;
927                                 ext += *ext + 1;
928                                 if (ext >= end)
929                                         break;
930                                 switch (*opt) {
931                                 case 53:        /* Message type */
932                                         if (opt[1])
933                                                 mt = opt[2];
934                                         break;
935                                 case 54:        /* Server ID (IP address) */
936                                         if (opt[1] >= 4)
937                                                 memcpy(&server_id, opt + 2, 4);
938                                         break;
939                                 };
940                         }
941
942 #ifdef IPCONFIG_DEBUG
943                         printk("DHCP: Got message type %d\n", mt);
944 #endif
945
946                         switch (mt) {
947                         case DHCPOFFER:
948                                 /* While in the process of accepting one offer,
949                                  * ignore all others.
950                                  */
951                                 if (ic_myaddr != INADDR_NONE)
952                                         goto drop_unlock;
953
954                                 /* Let's accept that offer. */
955                                 ic_myaddr = b->your_ip;
956                                 ic_servaddr = server_id;
957 #ifdef IPCONFIG_DEBUG
958                                 printk("DHCP: Offered address %u.%u.%u.%u",
959                                        NIPQUAD(ic_myaddr));
960                                 printk(" by server %u.%u.%u.%u\n",
961                                        NIPQUAD(ic_servaddr));
962 #endif
963                                 /* The DHCP indicated server address takes
964                                  * precedence over the bootp header one if
965                                  * they are different.
966                                  */
967                                 if ((server_id != INADDR_NONE) &&
968                                     (b->server_ip != server_id))
969                                         b->server_ip = ic_servaddr;
970                                 break;
971
972                         case DHCPACK:
973                                 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0)
974                                         goto drop_unlock;
975
976                                 /* Yeah! */
977                                 break;
978
979                         default:
980                                 /* Urque.  Forget it*/
981                                 ic_myaddr = INADDR_NONE;
982                                 ic_servaddr = INADDR_NONE;
983                                 goto drop_unlock;
984                         };
985
986                         ic_dhcp_msgtype = mt;
987
988                 }
989 #endif /* IPCONFIG_DHCP */
990
991                 ext = &b->exten[4];
992                 while (ext < end && *ext != 0xff) {
993                         u8 *opt = ext++;
994                         if (*opt == 0)  /* Padding */
995                                 continue;
996                         ext += *ext + 1;
997                         if (ext < end)
998                                 ic_do_bootp_ext(opt);
999                 }
1000         }
1001
1002         /* We have a winner! */
1003         ic_dev = dev;
1004         ic_myaddr = b->your_ip;
1005         ic_servaddr = b->server_ip;
1006         if (ic_gateway == INADDR_NONE && b->relay_ip)
1007                 ic_gateway = b->relay_ip;
1008         if (ic_nameservers[0] == INADDR_NONE)
1009                 ic_nameservers[0] = ic_servaddr;
1010         ic_got_reply = IC_BOOTP;
1011
1012 drop_unlock:
1013         /* Show's over.  Nothing to see here.  */
1014         spin_unlock(&ic_recv_lock);
1015
1016 drop:
1017         /* Throw the packet out. */
1018         kfree_skb(skb);
1019
1020         return 0;
1021 }       
1022
1023
1024 #endif
1025
1026
1027 /*
1028  *      Dynamic IP configuration -- DHCP, BOOTP, RARP.
1029  */
1030
1031 #ifdef IPCONFIG_DYNAMIC
1032
1033 static int __init ic_dynamic(void)
1034 {
1035         int retries;
1036         struct ic_device *d;
1037         unsigned long start_jiffies, timeout, jiff;
1038         int do_bootp = ic_proto_have_if & IC_BOOTP;
1039         int do_rarp = ic_proto_have_if & IC_RARP;
1040
1041         /*
1042          * If none of DHCP/BOOTP/RARP was selected, return with an error.
1043          * This routine gets only called when some pieces of information
1044          * are missing, and without DHCP/BOOTP/RARP we are unable to get it.
1045          */
1046         if (!ic_proto_enabled) {
1047                 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
1048                 return -1;
1049         }
1050
1051 #ifdef IPCONFIG_BOOTP
1052         if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
1053                 printk(KERN_ERR "DHCP/BOOTP: No suitable device found.\n");
1054 #endif
1055 #ifdef IPCONFIG_RARP
1056         if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)
1057                 printk(KERN_ERR "RARP: No suitable device found.\n");
1058 #endif
1059
1060         if (!ic_proto_have_if)
1061                 /* Error message already printed */
1062                 return -1;
1063
1064         /*
1065          * Setup protocols
1066          */
1067 #ifdef IPCONFIG_BOOTP
1068         if (do_bootp)
1069                 ic_bootp_init();
1070 #endif
1071 #ifdef IPCONFIG_RARP
1072         if (do_rarp)
1073                 ic_rarp_init();
1074 #endif
1075
1076         /*
1077          * Send requests and wait, until we get an answer. This loop
1078          * seems to be a terrible waste of CPU time, but actually there is
1079          * only one process running at all, so we don't need to use any
1080          * scheduler functions.
1081          * [Actually we could now, but the nothing else running note still 
1082          *  applies.. - AC]
1083          */
1084         printk(KERN_NOTICE "Sending %s%s%s requests .",
1085                do_bootp
1086                 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "",
1087                (do_bootp && do_rarp) ? " and " : "",
1088                do_rarp ? "RARP" : "");
1089
1090         start_jiffies = jiffies;
1091         d = ic_first_dev;
1092         retries = CONF_SEND_RETRIES;
1093         get_random_bytes(&timeout, sizeof(timeout));
1094         timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned) CONF_TIMEOUT_RANDOM);
1095         for(;;) {
1096 #ifdef IPCONFIG_BOOTP
1097                 if (do_bootp && (d->able & IC_BOOTP))
1098                         ic_bootp_send_if(d, jiffies - start_jiffies);
1099 #endif
1100 #ifdef IPCONFIG_RARP
1101                 if (do_rarp && (d->able & IC_RARP))
1102                         ic_rarp_send_if(d);
1103 #endif
1104
1105                 jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout);
1106                 while (time_before(jiffies, jiff) && !ic_got_reply) {
1107                         set_current_state(TASK_UNINTERRUPTIBLE);
1108                         schedule_timeout(1);
1109                 }
1110 #ifdef IPCONFIG_DHCP
1111                 /* DHCP isn't done until we get a DHCPACK. */
1112                 if ((ic_got_reply & IC_BOOTP)
1113                     && (ic_proto_enabled & IC_USE_DHCP)
1114                     && ic_dhcp_msgtype != DHCPACK)
1115                 {
1116                         ic_got_reply = 0;
1117                         printk(",");
1118                         continue;
1119                 }
1120 #endif /* IPCONFIG_DHCP */
1121
1122                 if (ic_got_reply) {
1123                         printk(" OK\n");
1124                         break;
1125                 }
1126
1127                 if ((d = d->next))
1128                         continue;
1129
1130                 if (! --retries) {
1131                         printk(" timed out!\n");
1132                         break;
1133                 }
1134
1135                 d = ic_first_dev;
1136
1137                 timeout = timeout CONF_TIMEOUT_MULT;
1138                 if (timeout > CONF_TIMEOUT_MAX)
1139                         timeout = CONF_TIMEOUT_MAX;
1140
1141                 printk(".");
1142         }
1143
1144 #ifdef IPCONFIG_BOOTP
1145         if (do_bootp)
1146                 ic_bootp_cleanup();
1147 #endif
1148 #ifdef IPCONFIG_RARP
1149         if (do_rarp)
1150                 ic_rarp_cleanup();
1151 #endif
1152
1153         if (!ic_got_reply) {
1154                 ic_myaddr = INADDR_NONE;
1155                 return -1;
1156         }
1157
1158         printk("IP-Config: Got %s answer from %u.%u.%u.%u, ",
1159                 ((ic_got_reply & IC_RARP) ? "RARP" 
1160                  : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),
1161                 NIPQUAD(ic_servaddr));
1162         printk("my address is %u.%u.%u.%u\n", NIPQUAD(ic_myaddr));
1163
1164         return 0;
1165 }
1166
1167 #endif /* IPCONFIG_DYNAMIC */
1168
1169 #ifdef CONFIG_PROC_FS
1170
1171 static int pnp_seq_show(struct seq_file *seq, void *v)
1172 {
1173         int i;
1174
1175         if (ic_proto_used & IC_PROTO)
1176                 seq_printf(seq, "#PROTO: %s\n",
1177                            (ic_proto_used & IC_RARP) ? "RARP"
1178                            : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP");
1179         else
1180                 seq_puts(seq, "#MANUAL\n");
1181
1182         if (ic_domain[0])
1183                 seq_printf(seq,
1184                            "domain %s\n", ic_domain);
1185         for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {
1186                 if (ic_nameservers[i] != INADDR_NONE)
1187                         seq_printf(seq,
1188                                    "nameserver %u.%u.%u.%u\n",
1189                                    NIPQUAD(ic_nameservers[i]));
1190         }
1191         if (ic_servaddr != INADDR_NONE)
1192                 seq_printf(seq,
1193                            "bootserver %u.%u.%u.%u\n",
1194                            NIPQUAD(ic_servaddr));
1195         return 0;
1196 }
1197
1198 static int pnp_seq_open(struct inode *indoe, struct file *file)
1199 {
1200         return single_open(file, pnp_seq_show, NULL);
1201 }
1202
1203 static struct file_operations pnp_seq_fops = {
1204         .owner          = THIS_MODULE,
1205         .open           = pnp_seq_open,
1206         .read           = seq_read,
1207         .llseek         = seq_lseek,
1208         .release        = single_release,
1209 };
1210 #endif /* CONFIG_PROC_FS */
1211
1212 /*
1213  *  Extract IP address from the parameter string if needed. Note that we
1214  *  need to have root_server_addr set _before_ IPConfig gets called as it
1215  *  can override it.
1216  */
1217 u32 __init root_nfs_parse_addr(char *name)
1218 {
1219         u32 addr;
1220         int octets = 0;
1221         char *cp, *cq;
1222
1223         cp = cq = name;
1224         while (octets < 4) {
1225                 while (*cp >= '0' && *cp <= '9')
1226                         cp++;
1227                 if (cp == cq || cp - cq > 3)
1228                         break;
1229                 if (*cp == '.' || octets == 3)
1230                         octets++;
1231                 if (octets < 4)
1232                         cp++;
1233                 cq = cp;
1234         }
1235         if (octets == 4 && (*cp == ':' || *cp == '\0')) {
1236                 if (*cp == ':')
1237                         *cp++ = '\0';
1238                 addr = in_aton(name);
1239                 memmove(name, cp, strlen(cp) + 1);
1240         } else
1241                 addr = INADDR_NONE;
1242
1243         return addr;
1244 }
1245
1246 /*
1247  *      IP Autoconfig dispatcher.
1248  */
1249
1250 static int __init ip_auto_config(void)
1251 {
1252         u32 addr;
1253
1254 #ifdef CONFIG_PROC_FS
1255         proc_net_fops_create("pnp", S_IRUGO, &pnp_seq_fops);
1256 #endif /* CONFIG_PROC_FS */
1257
1258         if (!ic_enable)
1259                 return 0;
1260
1261         DBG(("IP-Config: Entered.\n"));
1262 #ifdef IPCONFIG_DYNAMIC
1263  try_try_again:
1264 #endif
1265         /* Give hardware a chance to settle */
1266         msleep(CONF_PRE_OPEN);
1267
1268         /* Setup all network devices */
1269         if (ic_open_devs() < 0)
1270                 return -1;
1271
1272         /* Give drivers a chance to settle */
1273         ssleep(CONF_POST_OPEN);
1274
1275         /*
1276          * If the config information is insufficient (e.g., our IP address or
1277          * IP address of the boot server is missing or we have multiple network
1278          * interfaces and no default was set), use BOOTP or RARP to get the
1279          * missing values.
1280          */
1281         if (ic_myaddr == INADDR_NONE ||
1282 #ifdef CONFIG_ROOT_NFS
1283             (MAJOR(ROOT_DEV) == UNNAMED_MAJOR
1284              && root_server_addr == INADDR_NONE
1285              && ic_servaddr == INADDR_NONE) ||
1286 #endif
1287             ic_first_dev->next) {
1288 #ifdef IPCONFIG_DYNAMIC
1289         
1290                 int retries = CONF_OPEN_RETRIES;
1291
1292                 if (ic_dynamic() < 0) {
1293                         ic_close_devs();
1294
1295                         /*
1296                          * I don't know why, but sometimes the
1297                          * eepro100 driver (at least) gets upset and
1298                          * doesn't work the first time it's opened.
1299                          * But then if you close it and reopen it, it
1300                          * works just fine.  So we need to try that at
1301                          * least once before giving up.
1302                          *
1303                          * Also, if the root will be NFS-mounted, we
1304                          * have nowhere to go if DHCP fails.  So we
1305                          * just have to keep trying forever.
1306                          *
1307                          *                              -- Chip
1308                          */
1309 #ifdef CONFIG_ROOT_NFS
1310                         if (ROOT_DEV ==  Root_NFS) {
1311                                 printk(KERN_ERR 
1312                                         "IP-Config: Retrying forever (NFS root)...\n");
1313                                 goto try_try_again;
1314                         }
1315 #endif
1316
1317                         if (--retries) {
1318                                 printk(KERN_ERR 
1319                                        "IP-Config: Reopening network devices...\n");
1320                                 goto try_try_again;
1321                         }
1322
1323                         /* Oh, well.  At least we tried. */
1324                         printk(KERN_ERR "IP-Config: Auto-configuration of network failed.\n");
1325                         return -1;
1326                 }
1327 #else /* !DYNAMIC */
1328                 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
1329                 ic_close_devs();
1330                 return -1;
1331 #endif /* IPCONFIG_DYNAMIC */
1332         } else {
1333                 /* Device selected manually or only one device -> use it */
1334                 ic_dev = ic_first_dev->dev;
1335         }
1336
1337         addr = root_nfs_parse_addr(root_server_path);
1338         if (root_server_addr == INADDR_NONE)
1339                 root_server_addr = addr;
1340
1341         /*
1342          * Use defaults whereever applicable.
1343          */
1344         if (ic_defaults() < 0)
1345                 return -1;
1346
1347         /*
1348          * Close all network devices except the device we've
1349          * autoconfigured and set up routes.
1350          */
1351         ic_close_devs();
1352         if (ic_setup_if() < 0 || ic_setup_routes() < 0)
1353                 return -1;
1354
1355         /*
1356          * Record which protocol was actually used.
1357          */
1358 #ifdef IPCONFIG_DYNAMIC
1359         ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP);
1360 #endif
1361
1362 #ifndef IPCONFIG_SILENT
1363         /*
1364          * Clue in the operator.
1365          */
1366         printk("IP-Config: Complete:");
1367         printk("\n      device=%s", ic_dev->name);
1368         printk(", addr=%u.%u.%u.%u", NIPQUAD(ic_myaddr));
1369         printk(", mask=%u.%u.%u.%u", NIPQUAD(ic_netmask));
1370         printk(", gw=%u.%u.%u.%u", NIPQUAD(ic_gateway));
1371         printk(",\n     host=%s, domain=%s, nis-domain=%s",
1372                system_utsname.nodename, ic_domain, system_utsname.domainname);
1373         printk(",\n     bootserver=%u.%u.%u.%u", NIPQUAD(ic_servaddr));
1374         printk(", rootserver=%u.%u.%u.%u", NIPQUAD(root_server_addr));
1375         printk(", rootpath=%s", root_server_path);
1376         printk("\n");
1377 #endif /* !SILENT */
1378
1379         return 0;
1380 }
1381
1382 late_initcall(ip_auto_config);
1383
1384
1385 /*
1386  *  Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
1387  *  command line parameter. It consists of option fields separated by colons in
1388  *  the following order:
1389  *
1390  *  <client-ip>:<server-ip>:<gw-ip>:<netmask>:<host name>:<device>:<PROTO>
1391  *
1392  *  Any of the fields can be empty which means to use a default value:
1393  *      <client-ip>     - address given by BOOTP or RARP
1394  *      <server-ip>     - address of host returning BOOTP or RARP packet
1395  *      <gw-ip>         - none, or the address returned by BOOTP
1396  *      <netmask>       - automatically determined from <client-ip>, or the
1397  *                        one returned by BOOTP
1398  *      <host name>     - <client-ip> in ASCII notation, or the name returned
1399  *                        by BOOTP
1400  *      <device>        - use all available devices
1401  *      <PROTO>:
1402  *         off|none         - don't do autoconfig at all (DEFAULT)
1403  *         on|any           - use any configured protocol
1404  *         dhcp|bootp|rarp  - use only the specified protocol
1405  *         both             - use both BOOTP and RARP (not DHCP)
1406  */
1407 static int __init ic_proto_name(char *name)
1408 {
1409         if (!strcmp(name, "on") || !strcmp(name, "any")) {
1410                 return 1;
1411         }
1412 #ifdef CONFIG_IP_PNP_DHCP
1413         else if (!strcmp(name, "dhcp")) {
1414                 ic_proto_enabled &= ~IC_RARP;
1415                 return 1;
1416         }
1417 #endif
1418 #ifdef CONFIG_IP_PNP_BOOTP
1419         else if (!strcmp(name, "bootp")) {
1420                 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP);
1421                 return 1;
1422         }
1423 #endif
1424 #ifdef CONFIG_IP_PNP_RARP
1425         else if (!strcmp(name, "rarp")) {
1426                 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP);
1427                 return 1;
1428         }
1429 #endif
1430 #ifdef IPCONFIG_DYNAMIC
1431         else if (!strcmp(name, "both")) {
1432                 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */
1433                 return 1;
1434         }
1435 #endif
1436         return 0;
1437 }
1438
1439 static int __init ip_auto_config_setup(char *addrs)
1440 {
1441         char *cp, *ip, *dp;
1442         int num = 0;
1443
1444         ic_set_manually = 1;
1445
1446         ic_enable = (*addrs && 
1447                 (strcmp(addrs, "off") != 0) && 
1448                 (strcmp(addrs, "none") != 0));
1449         if (!ic_enable)
1450                 return 1;
1451
1452         if (ic_proto_name(addrs))
1453                 return 1;
1454
1455         /* Parse the whole string */
1456         ip = addrs;
1457         while (ip && *ip) {
1458                 if ((cp = strchr(ip, ':')))
1459                         *cp++ = '\0';
1460                 if (strlen(ip) > 0) {
1461                         DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip));
1462                         switch (num) {
1463                         case 0:
1464                                 if ((ic_myaddr = in_aton(ip)) == INADDR_ANY)
1465                                         ic_myaddr = INADDR_NONE;
1466                                 break;
1467                         case 1:
1468                                 if ((ic_servaddr = in_aton(ip)) == INADDR_ANY)
1469                                         ic_servaddr = INADDR_NONE;
1470                                 break;
1471                         case 2:
1472                                 if ((ic_gateway = in_aton(ip)) == INADDR_ANY)
1473                                         ic_gateway = INADDR_NONE;
1474                                 break;
1475                         case 3:
1476                                 if ((ic_netmask = in_aton(ip)) == INADDR_ANY)
1477                                         ic_netmask = INADDR_NONE;
1478                                 break;
1479                         case 4:
1480                                 if ((dp = strchr(ip, '.'))) {
1481                                         *dp++ = '\0';
1482                                         strlcpy(system_utsname.domainname, dp,
1483                                                 sizeof(system_utsname.domainname));
1484                                 }
1485                                 strlcpy(system_utsname.nodename, ip,
1486                                         sizeof(system_utsname.nodename));
1487                                 ic_host_name_set = 1;
1488                                 break;
1489                         case 5:
1490                                 strlcpy(user_dev_name, ip, sizeof(user_dev_name));
1491                                 break;
1492                         case 6:
1493                                 ic_proto_name(ip);
1494                                 break;
1495                         }
1496                 }
1497                 ip = cp;
1498                 num++;
1499         }
1500
1501         return 1;
1502 }
1503
1504 static int __init nfsaddrs_config_setup(char *addrs)
1505 {
1506         return ip_auto_config_setup(addrs);
1507 }
1508
1509 __setup("ip=", ip_auto_config_setup);
1510 __setup("nfsaddrs=", nfsaddrs_config_setup);