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Linux 2.6.25.20
[linux/fpc-iii.git] / net / ipv4 / ipconfig.c
blob4824fe8996bf75a8a2c93b01ae573b7098525335
1 /*
2 * $Id: ipconfig.c,v 1.46 2002/02/01 22:01:04 davem Exp $
3 *
4 * Automatic Configuration of IP -- use DHCP, BOOTP, RARP, or
5 * user-supplied information to configure own IP address and routes.
6 *
7 * Copyright (C) 1996-1998 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
8 *
9 * Derived from network configuration code in fs/nfs/nfsroot.c,
10 * originally Copyright (C) 1995, 1996 Gero Kuhlmann and me.
11 *
12 * BOOTP rewritten to construct and analyse packets itself instead
13 * of misusing the IP layer. num_bugs_causing_wrong_arp_replies--;
14 * -- MJ, December 1998
15 *
16 * Fixed ip_auto_config_setup calling at startup in the new "Linker Magic"
17 * initialization scheme.
18 * - Arnaldo Carvalho de Melo <acme@conectiva.com.br>, 08/11/1999
19 *
20 * DHCP support added. To users this looks like a whole separate
21 * protocol, but we know it's just a bag on the side of BOOTP.
22 * -- Chip Salzenberg <chip@valinux.com>, May 2000
23 *
24 * Ported DHCP support from 2.2.16 to 2.4.0-test4
25 * -- Eric Biederman <ebiederman@lnxi.com>, 30 Aug 2000
26 *
27 * Merged changes from 2.2.19 into 2.4.3
28 * -- Eric Biederman <ebiederman@lnxi.com>, 22 April Aug 2001
29 *
30 * Multiple Nameservers in /proc/net/pnp
31 * -- Josef Siemes <jsiemes@web.de>, Aug 2002
32 */
33
34 #include <linux/types.h>
35 #include <linux/string.h>
36 #include <linux/kernel.h>
37 #include <linux/jiffies.h>
38 #include <linux/random.h>
39 #include <linux/init.h>
40 #include <linux/utsname.h>
41 #include <linux/in.h>
42 #include <linux/if.h>
43 #include <linux/inet.h>
44 #include <linux/inetdevice.h>
45 #include <linux/netdevice.h>
46 #include <linux/if_arp.h>
47 #include <linux/skbuff.h>
48 #include <linux/ip.h>
49 #include <linux/socket.h>
50 #include <linux/route.h>
51 #include <linux/udp.h>
52 #include <linux/proc_fs.h>
53 #include <linux/seq_file.h>
54 #include <linux/major.h>
55 #include <linux/root_dev.h>
56 #include <linux/delay.h>
57 #include <linux/nfs_fs.h>
58 #include <net/net_namespace.h>
59 #include <net/arp.h>
60 #include <net/ip.h>
61 #include <net/ipconfig.h>
62 #include <net/route.h>
63
64 #include <asm/uaccess.h>
65 #include <net/checksum.h>
66 #include <asm/processor.h>
67
68 /* Define this to allow debugging output */
69 #undef IPCONFIG_DEBUG
70
71 #ifdef IPCONFIG_DEBUG
72 #define DBG(x) printk x
73 #else
74 #define DBG(x) do { } while(0)
75 #endif
76
77 #if defined(CONFIG_IP_PNP_DHCP)
78 #define IPCONFIG_DHCP
79 #endif
80 #if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_DHCP)
81 #define IPCONFIG_BOOTP
82 #endif
83 #if defined(CONFIG_IP_PNP_RARP)
84 #define IPCONFIG_RARP
85 #endif
86 #if defined(IPCONFIG_BOOTP) || defined(IPCONFIG_RARP)
87 #define IPCONFIG_DYNAMIC
88 #endif
89
90 /* Define the friendly delay before and after opening net devices */
91 #define CONF_PRE_OPEN 500 /* Before opening: 1/2 second */
92 #define CONF_POST_OPEN 1 /* After opening: 1 second */
93
94 /* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */
95 #define CONF_OPEN_RETRIES 2 /* (Re)open devices twice */
96 #define CONF_SEND_RETRIES 6 /* Send six requests per open */
97 #define CONF_INTER_TIMEOUT (HZ/2) /* Inter-device timeout: 1/2 second */
98 #define CONF_BASE_TIMEOUT (HZ*2) /* Initial timeout: 2 seconds */
99 #define CONF_TIMEOUT_RANDOM (HZ) /* Maximum amount of randomization */
100 #define CONF_TIMEOUT_MULT *7/4 /* Rate of timeout growth */
101 #define CONF_TIMEOUT_MAX (HZ*30) /* Maximum allowed timeout */
102 #define CONF_NAMESERVERS_MAX 3 /* Maximum number of nameservers
103 - '3' from resolv.h */
104
105 #define NONE __constant_htonl(INADDR_NONE)
106 #define ANY __constant_htonl(INADDR_ANY)
107
108 /*
109 * Public IP configuration
110 */
111
112 /* This is used by platforms which might be able to set the ipconfig
113 * variables using firmware environment vars. If this is set, it will
114 * ignore such firmware variables.
115 */
116 int ic_set_manually __initdata = 0; /* IPconfig parameters set manually */
117
118 static int ic_enable __initdata = 0; /* IP config enabled? */
119
120 /* Protocol choice */
121 int ic_proto_enabled __initdata = 0
122 #ifdef IPCONFIG_BOOTP
123 | IC_BOOTP
124 #endif
125 #ifdef CONFIG_IP_PNP_DHCP
126 | IC_USE_DHCP
127 #endif
128 #ifdef IPCONFIG_RARP
129 | IC_RARP
130 #endif
131 ;
132
133 static int ic_host_name_set __initdata = 0; /* Host name set by us? */
134
135 __be32 ic_myaddr = NONE; /* My IP address */
136 static __be32 ic_netmask = NONE; /* Netmask for local subnet */
137 __be32 ic_gateway = NONE; /* Gateway IP address */
138
139 __be32 ic_servaddr = NONE; /* Boot server IP address */
140
141 __be32 root_server_addr = NONE; /* Address of NFS server */
142 u8 root_server_path[256] = { 0, }; /* Path to mount as root */
143
144 /* vendor class identifier */
145 static char vendor_class_identifier[253] __initdata;
146
147 /* Persistent data: */
148
149 static int ic_proto_used; /* Protocol used, if any */
150 static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */
151 static u8 ic_domain[64]; /* DNS (not NIS) domain name */
152
153 /*
154 * Private state.
155 */
156
157 /* Name of user-selected boot device */
158 static char user_dev_name[IFNAMSIZ] __initdata = { 0, };
159
160 /* Protocols supported by available interfaces */
161 static int ic_proto_have_if __initdata = 0;
162
163 #ifdef IPCONFIG_DYNAMIC
164 static DEFINE_SPINLOCK(ic_recv_lock);
165 static volatile int ic_got_reply __initdata = 0; /* Proto(s) that replied */
166 #endif
167 #ifdef IPCONFIG_DHCP
168 static int ic_dhcp_msgtype __initdata = 0; /* DHCP msg type received */
169 #endif
170
171
172 /*
173 * Network devices
174 */
175
176 struct ic_device {
177 struct ic_device *next;
178 struct net_device *dev;
179 unsigned short flags;
180 short able;
181 __be32 xid;
182 };
183
184 static struct ic_device *ic_first_dev __initdata = NULL;/* List of open device */
185 static struct net_device *ic_dev __initdata = NULL; /* Selected device */
186
187 static int __init ic_open_devs(void)
188 {
189 struct ic_device *d, **last;
190 struct net_device *dev;
191 unsigned short oflags;
192
193 last = &ic_first_dev;
194 rtnl_lock();
195
196 /* bring loopback device up first */
197 for_each_netdev(&init_net, dev) {
198 if (!(dev->flags & IFF_LOOPBACK))
199 continue;
200 if (dev_change_flags(dev, dev->flags | IFF_UP) < 0)
201 printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name);
202 }
203
204 for_each_netdev(&init_net, dev) {
205 if (dev->flags & IFF_LOOPBACK)
206 continue;
207 if (user_dev_name[0] ? !strcmp(dev->name, user_dev_name) :
208 (!(dev->flags & IFF_LOOPBACK) &&
209 (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) &&
210 strncmp(dev->name, "dummy", 5))) {
211 int able = 0;
212 if (dev->mtu >= 364)
213 able |= IC_BOOTP;
214 else
215 printk(KERN_WARNING "DHCP/BOOTP: Ignoring device %s, MTU %d too small", dev->name, dev->mtu);
216 if (!(dev->flags & IFF_NOARP))
217 able |= IC_RARP;
218 able &= ic_proto_enabled;
219 if (ic_proto_enabled && !able)
220 continue;
221 oflags = dev->flags;
222 if (dev_change_flags(dev, oflags | IFF_UP) < 0) {
223 printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name);
224 continue;
225 }
226 if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) {
227 rtnl_unlock();
228 return -1;
229 }
230 d->dev = dev;
231 *last = d;
232 last = &d->next;
233 d->flags = oflags;
234 d->able = able;
235 if (able & IC_BOOTP)
236 get_random_bytes(&d->xid, sizeof(__be32));
237 else
238 d->xid = 0;
239 ic_proto_have_if |= able;
240 DBG(("IP-Config: %s UP (able=%d, xid=%08x)\n",
241 dev->name, able, d->xid));
242 }
243 }
244 rtnl_unlock();
245
246 *last = NULL;
247
248 if (!ic_first_dev) {
249 if (user_dev_name[0])
250 printk(KERN_ERR "IP-Config: Device `%s' not found.\n", user_dev_name);
251 else
252 printk(KERN_ERR "IP-Config: No network devices available.\n");
253 return -1;
254 }
255 return 0;
256 }
257
258 static void __init ic_close_devs(void)
259 {
260 struct ic_device *d, *next;
261 struct net_device *dev;
262
263 rtnl_lock();
264 next = ic_first_dev;
265 while ((d = next)) {
266 next = d->next;
267 dev = d->dev;
268 if (dev != ic_dev) {
269 DBG(("IP-Config: Downing %s\n", dev->name));
270 dev_change_flags(dev, d->flags);
271 }
272 kfree(d);
273 }
274 rtnl_unlock();
275 }
276
277 /*
278 * Interface to various network functions.
279 */
280
281 static inline void
282 set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port)
283 {
284 sin->sin_family = AF_INET;
285 sin->sin_addr.s_addr = addr;
286 sin->sin_port = port;
287 }
288
289 static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg)
290 {
291 int res;
292
293 mm_segment_t oldfs = get_fs();
294 set_fs(get_ds());
295 res = devinet_ioctl(cmd, (struct ifreq __user *) arg);
296 set_fs(oldfs);
297 return res;
298 }
299
300 static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg)
301 {
302 int res;
303
304 mm_segment_t oldfs = get_fs();
305 set_fs(get_ds());
306 res = ip_rt_ioctl(&init_net, cmd, (void __user *) arg);
307 set_fs(oldfs);
308 return res;
309 }
310
311 /*
312 * Set up interface addresses and routes.
313 */
314
315 static int __init ic_setup_if(void)
316 {
317 struct ifreq ir;
318 struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr;
319 int err;
320
321 memset(&ir, 0, sizeof(ir));
322 strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name);
323 set_sockaddr(sin, ic_myaddr, 0);
324 if ((err = ic_dev_ioctl(SIOCSIFADDR, &ir)) < 0) {
325 printk(KERN_ERR "IP-Config: Unable to set interface address (%d).\n", err);
326 return -1;
327 }
328 set_sockaddr(sin, ic_netmask, 0);
329 if ((err = ic_dev_ioctl(SIOCSIFNETMASK, &ir)) < 0) {
330 printk(KERN_ERR "IP-Config: Unable to set interface netmask (%d).\n", err);
331 return -1;
332 }
333 set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0);
334 if ((err = ic_dev_ioctl(SIOCSIFBRDADDR, &ir)) < 0) {
335 printk(KERN_ERR "IP-Config: Unable to set interface broadcast address (%d).\n", err);
336 return -1;
337 }
338 return 0;
339 }
340
341 static int __init ic_setup_routes(void)
342 {
343 /* No need to setup device routes, only the default route... */
344
345 if (ic_gateway != NONE) {
346 struct rtentry rm;
347 int err;
348
349 memset(&rm, 0, sizeof(rm));
350 if ((ic_gateway ^ ic_myaddr) & ic_netmask) {
351 printk(KERN_ERR "IP-Config: Gateway not on directly connected network.\n");
352 return -1;
353 }
354 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0);
355 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0);
356 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0);
357 rm.rt_flags = RTF_UP | RTF_GATEWAY;
358 if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) {
359 printk(KERN_ERR "IP-Config: Cannot add default route (%d).\n", err);
360 return -1;
361 }
362 }
363
364 return 0;
365 }
366
367 /*
368 * Fill in default values for all missing parameters.
369 */
370
371 static int __init ic_defaults(void)
372 {
373 /*
374 * At this point we have no userspace running so need not
375 * claim locks on system_utsname
376 */
377
378 if (!ic_host_name_set)
379 sprintf(init_utsname()->nodename, "%u.%u.%u.%u", NIPQUAD(ic_myaddr));
380
381 if (root_server_addr == NONE)
382 root_server_addr = ic_servaddr;
383
384 if (ic_netmask == NONE) {
385 if (IN_CLASSA(ntohl(ic_myaddr)))
386 ic_netmask = htonl(IN_CLASSA_NET);
387 else if (IN_CLASSB(ntohl(ic_myaddr)))
388 ic_netmask = htonl(IN_CLASSB_NET);
389 else if (IN_CLASSC(ntohl(ic_myaddr)))
390 ic_netmask = htonl(IN_CLASSC_NET);
391 else {
392 printk(KERN_ERR "IP-Config: Unable to guess netmask for address %u.%u.%u.%u\n",
393 NIPQUAD(ic_myaddr));
394 return -1;
395 }
396 printk("IP-Config: Guessing netmask %u.%u.%u.%u\n", NIPQUAD(ic_netmask));
397 }
398
399 return 0;
400 }
401
402 /*
403 * RARP support.
404 */
405
406 #ifdef IPCONFIG_RARP
407
408 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
409
410 static struct packet_type rarp_packet_type __initdata = {
411 .type = __constant_htons(ETH_P_RARP),
412 .func = ic_rarp_recv,
413 };
414
415 static inline void ic_rarp_init(void)
416 {
417 dev_add_pack(&rarp_packet_type);
418 }
419
420 static inline void ic_rarp_cleanup(void)
421 {
422 dev_remove_pack(&rarp_packet_type);
423 }
424
425 /*
426 * Process received RARP packet.
427 */
428 static int __init
429 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
430 {
431 struct arphdr *rarp;
432 unsigned char *rarp_ptr;
433 __be32 sip, tip;
434 unsigned char *sha, *tha; /* s for "source", t for "target" */
435 struct ic_device *d;
436
437 if (dev->nd_net != &init_net)
438 goto drop;
439
440 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
441 return NET_RX_DROP;
442
443 if (!pskb_may_pull(skb, sizeof(struct arphdr)))
444 goto drop;
445
446 /* Basic sanity checks can be done without the lock. */
447 rarp = (struct arphdr *)skb_transport_header(skb);
448
449 /* If this test doesn't pass, it's not IP, or we should
450 * ignore it anyway.
451 */
452 if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd))
453 goto drop;
454
455 /* If it's not a RARP reply, delete it. */
456 if (rarp->ar_op != htons(ARPOP_RREPLY))
457 goto drop;
458
459 /* If it's not Ethernet, delete it. */
460 if (rarp->ar_pro != htons(ETH_P_IP))
461 goto drop;
462
463 if (!pskb_may_pull(skb,
464 sizeof(struct arphdr) +
465 (2 * dev->addr_len) +
466 (2 * 4)))
467 goto drop;
468
469 /* OK, it is all there and looks valid, process... */
470 rarp = (struct arphdr *)skb_transport_header(skb);
471 rarp_ptr = (unsigned char *) (rarp + 1);
472
473 /* One reply at a time, please. */
474 spin_lock(&ic_recv_lock);
475
476 /* If we already have a reply, just drop the packet */
477 if (ic_got_reply)
478 goto drop_unlock;
479
480 /* Find the ic_device that the packet arrived on */
481 d = ic_first_dev;
482 while (d && d->dev != dev)
483 d = d->next;
484 if (!d)
485 goto drop_unlock; /* should never happen */
486
487 /* Extract variable-width fields */
488 sha = rarp_ptr;
489 rarp_ptr += dev->addr_len;
490 memcpy(&sip, rarp_ptr, 4);
491 rarp_ptr += 4;
492 tha = rarp_ptr;
493 rarp_ptr += dev->addr_len;
494 memcpy(&tip, rarp_ptr, 4);
495
496 /* Discard packets which are not meant for us. */
497 if (memcmp(tha, dev->dev_addr, dev->addr_len))
498 goto drop_unlock;
499
500 /* Discard packets which are not from specified server. */
501 if (ic_servaddr != NONE && ic_servaddr != sip)
502 goto drop_unlock;
503
504 /* We have a winner! */
505 ic_dev = dev;
506 if (ic_myaddr == NONE)
507 ic_myaddr = tip;
508 ic_servaddr = sip;
509 ic_got_reply = IC_RARP;
510
511 drop_unlock:
512 /* Show's over. Nothing to see here. */
513 spin_unlock(&ic_recv_lock);
514
515 drop:
516 /* Throw the packet out. */
517 kfree_skb(skb);
518 return 0;
519 }
520
521
522 /*
523 * Send RARP request packet over a single interface.
524 */
525 static void __init ic_rarp_send_if(struct ic_device *d)
526 {
527 struct net_device *dev = d->dev;
528 arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL,
529 dev->dev_addr, dev->dev_addr);
530 }
531 #endif
532
533 /*
534 * DHCP/BOOTP support.
535 */
536
537 #ifdef IPCONFIG_BOOTP
538
539 struct bootp_pkt { /* BOOTP packet format */
540 struct iphdr iph; /* IP header */
541 struct udphdr udph; /* UDP header */
542 u8 op; /* 1=request, 2=reply */
543 u8 htype; /* HW address type */
544 u8 hlen; /* HW address length */
545 u8 hops; /* Used only by gateways */
546 __be32 xid; /* Transaction ID */
547 __be16 secs; /* Seconds since we started */
548 __be16 flags; /* Just what it says */
549 __be32 client_ip; /* Client's IP address if known */
550 __be32 your_ip; /* Assigned IP address */
551 __be32 server_ip; /* (Next, e.g. NFS) Server's IP address */
552 __be32 relay_ip; /* IP address of BOOTP relay */
553 u8 hw_addr[16]; /* Client's HW address */
554 u8 serv_name[64]; /* Server host name */
555 u8 boot_file[128]; /* Name of boot file */
556 u8 exten[312]; /* DHCP options / BOOTP vendor extensions */
557 };
558
559 /* packet ops */
560 #define BOOTP_REQUEST 1
561 #define BOOTP_REPLY 2
562
563 /* DHCP message types */
564 #define DHCPDISCOVER 1
565 #define DHCPOFFER 2
566 #define DHCPREQUEST 3
567 #define DHCPDECLINE 4
568 #define DHCPACK 5
569 #define DHCPNAK 6
570 #define DHCPRELEASE 7
571 #define DHCPINFORM 8
572
573 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
574
575 static struct packet_type bootp_packet_type __initdata = {
576 .type = __constant_htons(ETH_P_IP),
577 .func = ic_bootp_recv,
578 };
579
580
581 /*
582 * Initialize DHCP/BOOTP extension fields in the request.
583 */
584
585 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 };
586
587 #ifdef IPCONFIG_DHCP
588
589 static void __init
590 ic_dhcp_init_options(u8 *options)
591 {
592 u8 mt = ((ic_servaddr == NONE)
593 ? DHCPDISCOVER : DHCPREQUEST);
594 u8 *e = options;
595 int len;
596
597 #ifdef IPCONFIG_DEBUG
598 printk("DHCP: Sending message type %d\n", mt);
599 #endif
600
601 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */
602 e += 4;
603
604 *e++ = 53; /* DHCP message type */
605 *e++ = 1;
606 *e++ = mt;
607
608 if (mt == DHCPREQUEST) {
609 *e++ = 54; /* Server ID (IP address) */
610 *e++ = 4;
611 memcpy(e, &ic_servaddr, 4);
612 e += 4;
613
614 *e++ = 50; /* Requested IP address */
615 *e++ = 4;
616 memcpy(e, &ic_myaddr, 4);
617 e += 4;
618 }
619
620 /* always? */
621 {
622 static const u8 ic_req_params[] = {
623 1, /* Subnet mask */
624 3, /* Default gateway */
625 6, /* DNS server */
626 12, /* Host name */
627 15, /* Domain name */
628 17, /* Boot path */
629 40, /* NIS domain name */
630 };
631
632 *e++ = 55; /* Parameter request list */
633 *e++ = sizeof(ic_req_params);
634 memcpy(e, ic_req_params, sizeof(ic_req_params));
635 e += sizeof(ic_req_params);
636
637 if (*vendor_class_identifier) {
638 printk(KERN_INFO "DHCP: sending class identifier \"%s\"\n",
639 vendor_class_identifier);
640 *e++ = 60; /* Class-identifier */
641 len = strlen(vendor_class_identifier);
642 *e++ = len;
643 memcpy(e, vendor_class_identifier, len);
644 e += len;
645 }
646 }
647
648 *e++ = 255; /* End of the list */
649 }
650
651 #endif /* IPCONFIG_DHCP */
652
653 static void __init ic_bootp_init_ext(u8 *e)
654 {
655 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */
656 e += 4;
657 *e++ = 1; /* Subnet mask request */
658 *e++ = 4;
659 e += 4;
660 *e++ = 3; /* Default gateway request */
661 *e++ = 4;
662 e += 4;
663 *e++ = 5; /* Name server request */
664 *e++ = 8;
665 e += 8;
666 *e++ = 12; /* Host name request */
667 *e++ = 32;
668 e += 32;
669 *e++ = 40; /* NIS Domain name request */
670 *e++ = 32;
671 e += 32;
672 *e++ = 17; /* Boot path */
673 *e++ = 40;
674 e += 40;
675
676 *e++ = 57; /* set extension buffer size for reply */
677 *e++ = 2;
678 *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */
679 *e++ = 150;
680
681 *e++ = 255; /* End of the list */
682 }
683
684
685 /*
686 * Initialize the DHCP/BOOTP mechanism.
687 */
688 static inline void ic_bootp_init(void)
689 {
690 int i;
691
692 for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
693 ic_nameservers[i] = NONE;
694
695 dev_add_pack(&bootp_packet_type);
696 }
697
698
699 /*
700 * DHCP/BOOTP cleanup.
701 */
702 static inline void ic_bootp_cleanup(void)
703 {
704 dev_remove_pack(&bootp_packet_type);
705 }
706
707
708 /*
709 * Send DHCP/BOOTP request to single interface.
710 */
711 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff)
712 {
713 struct net_device *dev = d->dev;
714 struct sk_buff *skb;
715 struct bootp_pkt *b;
716 int hh_len = LL_RESERVED_SPACE(dev);
717 struct iphdr *h;
718
719 /* Allocate packet */
720 skb = alloc_skb(sizeof(struct bootp_pkt) + hh_len + 15, GFP_KERNEL);
721 if (!skb)
722 return;
723 skb_reserve(skb, hh_len);
724 b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt));
725 memset(b, 0, sizeof(struct bootp_pkt));
726
727 /* Construct IP header */
728 skb_reset_network_header(skb);
729 h = ip_hdr(skb);
730 h->version = 4;
731 h->ihl = 5;
732 h->tot_len = htons(sizeof(struct bootp_pkt));
733 h->frag_off = htons(IP_DF);
734 h->ttl = 64;
735 h->protocol = IPPROTO_UDP;
736 h->daddr = htonl(INADDR_BROADCAST);
737 h->check = ip_fast_csum((unsigned char *) h, h->ihl);
738
739 /* Construct UDP header */
740 b->udph.source = htons(68);
741 b->udph.dest = htons(67);
742 b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr));
743 /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */
744
745 /* Construct DHCP/BOOTP header */
746 b->op = BOOTP_REQUEST;
747 if (dev->type < 256) /* check for false types */
748 b->htype = dev->type;
749 else if (dev->type == ARPHRD_IEEE802_TR) /* fix for token ring */
750 b->htype = ARPHRD_IEEE802;
751 else if (dev->type == ARPHRD_FDDI)
752 b->htype = ARPHRD_ETHER;
753 else {
754 printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name);
755 b->htype = dev->type; /* can cause undefined behavior */
756 }
757
758 /* server_ip and your_ip address are both already zero per RFC2131 */
759 b->hlen = dev->addr_len;
760 memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
761 b->secs = htons(jiffies_diff / HZ);
762 b->xid = d->xid;
763
764 /* add DHCP options or BOOTP extensions */
765 #ifdef IPCONFIG_DHCP
766 if (ic_proto_enabled & IC_USE_DHCP)
767 ic_dhcp_init_options(b->exten);
768 else
769 #endif
770 ic_bootp_init_ext(b->exten);
771
772 /* Chain packet down the line... */
773 skb->dev = dev;
774 skb->protocol = htons(ETH_P_IP);
775 if (dev_hard_header(skb, dev, ntohs(skb->protocol),
776 dev->broadcast, dev->dev_addr, skb->len) < 0 ||
777 dev_queue_xmit(skb) < 0)
778 printk("E");
779 }
780
781
782 /*
783 * Copy BOOTP-supplied string if not already set.
784 */
785 static int __init ic_bootp_string(char *dest, char *src, int len, int max)
786 {
787 if (!len)
788 return 0;
789 if (len > max-1)
790 len = max-1;
791 memcpy(dest, src, len);
792 dest[len] = '\0';
793 return 1;
794 }
795
796
797 /*
798 * Process BOOTP extensions.
799 */
800 static void __init ic_do_bootp_ext(u8 *ext)
801 {
802 u8 servers;
803 int i;
804
805 #ifdef IPCONFIG_DEBUG
806 u8 *c;
807
808 printk("DHCP/BOOTP: Got extension %d:",*ext);
809 for (c=ext+2; c<ext+2+ext[1]; c++)
810 printk(" %02x", *c);
811 printk("\n");
812 #endif
813
814 switch (*ext++) {
815 case 1: /* Subnet mask */
816 if (ic_netmask == NONE)
817 memcpy(&ic_netmask, ext+1, 4);
818 break;
819 case 3: /* Default gateway */
820 if (ic_gateway == NONE)
821 memcpy(&ic_gateway, ext+1, 4);
822 break;
823 case 6: /* DNS server */
824 servers= *ext/4;
825 if (servers > CONF_NAMESERVERS_MAX)
826 servers = CONF_NAMESERVERS_MAX;
827 for (i = 0; i < servers; i++) {
828 if (ic_nameservers[i] == NONE)
829 memcpy(&ic_nameservers[i], ext+1+4*i, 4);
830 }
831 break;
832 case 12: /* Host name */
833 ic_bootp_string(utsname()->nodename, ext+1, *ext, __NEW_UTS_LEN);
834 ic_host_name_set = 1;
835 break;
836 case 15: /* Domain name (DNS) */
837 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
838 break;
839 case 17: /* Root path */
840 if (!root_server_path[0])
841 ic_bootp_string(root_server_path, ext+1, *ext, sizeof(root_server_path));
842 break;
843 case 40: /* NIS Domain name (_not_ DNS) */
844 ic_bootp_string(utsname()->domainname, ext+1, *ext, __NEW_UTS_LEN);
845 break;
846 }
847 }
848
849
850 /*
851 * Receive BOOTP reply.
852 */
853 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
854 {
855 struct bootp_pkt *b;
856 struct iphdr *h;
857 struct ic_device *d;
858 int len, ext_len;
859
860 if (dev->nd_net != &init_net)
861 goto drop;
862
863 /* Perform verifications before taking the lock. */
864 if (skb->pkt_type == PACKET_OTHERHOST)
865 goto drop;
866
867 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
868 return NET_RX_DROP;
869
870 if (!pskb_may_pull(skb,
871 sizeof(struct iphdr) +
872 sizeof(struct udphdr)))
873 goto drop;
874
875 b = (struct bootp_pkt *)skb_network_header(skb);
876 h = &b->iph;
877
878 if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP)
879 goto drop;
880
881 /* Fragments are not supported */
882 if (h->frag_off & htons(IP_OFFSET | IP_MF)) {
883 if (net_ratelimit())
884 printk(KERN_ERR "DHCP/BOOTP: Ignoring fragmented "
885 "reply.\n");
886 goto drop;
887 }
888
889 if (skb->len < ntohs(h->tot_len))
890 goto drop;
891
892 if (ip_fast_csum((char *) h, h->ihl))
893 goto drop;
894
895 if (b->udph.source != htons(67) || b->udph.dest != htons(68))
896 goto drop;
897
898 if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
899 goto drop;
900
901 len = ntohs(b->udph.len) - sizeof(struct udphdr);
902 ext_len = len - (sizeof(*b) -
903 sizeof(struct iphdr) -
904 sizeof(struct udphdr) -
905 sizeof(b->exten));
906 if (ext_len < 0)
907 goto drop;
908
909 /* Ok the front looks good, make sure we can get at the rest. */
910 if (!pskb_may_pull(skb, skb->len))
911 goto drop;
912
913 b = (struct bootp_pkt *)skb_network_header(skb);
914 h = &b->iph;
915
916 /* One reply at a time, please. */
917 spin_lock(&ic_recv_lock);
918
919 /* If we already have a reply, just drop the packet */
920 if (ic_got_reply)
921 goto drop_unlock;
922
923 /* Find the ic_device that the packet arrived on */
924 d = ic_first_dev;
925 while (d && d->dev != dev)
926 d = d->next;
927 if (!d)
928 goto drop_unlock; /* should never happen */
929
930 /* Is it a reply to our BOOTP request? */
931 if (b->op != BOOTP_REPLY ||
932 b->xid != d->xid) {
933 if (net_ratelimit())
934 printk(KERN_ERR "DHCP/BOOTP: Reply not for us, "
935 "op[%x] xid[%x]\n",
936 b->op, b->xid);
937 goto drop_unlock;
938 }
939
940 /* Parse extensions */
941 if (ext_len >= 4 &&
942 !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */
943 u8 *end = (u8 *) b + ntohs(b->iph.tot_len);
944 u8 *ext;
945
946 #ifdef IPCONFIG_DHCP
947 if (ic_proto_enabled & IC_USE_DHCP) {
948 __be32 server_id = NONE;
949 int mt = 0;
950
951 ext = &b->exten[4];
952 while (ext < end && *ext != 0xff) {
953 u8 *opt = ext++;
954 if (*opt == 0) /* Padding */
955 continue;
956 ext += *ext + 1;
957 if (ext >= end)
958 break;
959 switch (*opt) {
960 case 53: /* Message type */
961 if (opt[1])
962 mt = opt[2];
963 break;
964 case 54: /* Server ID (IP address) */
965 if (opt[1] >= 4)
966 memcpy(&server_id, opt + 2, 4);
967 break;
968 }
969 }
970
971 #ifdef IPCONFIG_DEBUG
972 printk("DHCP: Got message type %d\n", mt);
973 #endif
974
975 switch (mt) {
976 case DHCPOFFER:
977 /* While in the process of accepting one offer,
978 * ignore all others.
979 */
980 if (ic_myaddr != NONE)
981 goto drop_unlock;
982
983 /* Let's accept that offer. */
984 ic_myaddr = b->your_ip;
985 ic_servaddr = server_id;
986 #ifdef IPCONFIG_DEBUG
987 printk("DHCP: Offered address %u.%u.%u.%u",
988 NIPQUAD(ic_myaddr));
989 printk(" by server %u.%u.%u.%u\n",
990 NIPQUAD(ic_servaddr));
991 #endif
992 /* The DHCP indicated server address takes
993 * precedence over the bootp header one if
994 * they are different.
995 */
996 if ((server_id != NONE) &&
997 (b->server_ip != server_id))
998 b->server_ip = ic_servaddr;
999 break;
1000
1001 case DHCPACK:
1002 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0)
1003 goto drop_unlock;
1004
1005 /* Yeah! */
1006 break;
1007
1008 default:
1009 /* Urque. Forget it*/
1010 ic_myaddr = NONE;
1011 ic_servaddr = NONE;
1012 goto drop_unlock;
1013 }
1014
1015 ic_dhcp_msgtype = mt;
1016
1017 }
1018 #endif /* IPCONFIG_DHCP */
1019
1020 ext = &b->exten[4];
1021 while (ext < end && *ext != 0xff) {
1022 u8 *opt = ext++;
1023 if (*opt == 0) /* Padding */
1024 continue;
1025 ext += *ext + 1;
1026 if (ext < end)
1027 ic_do_bootp_ext(opt);
1028 }
1029 }
1030
1031 /* We have a winner! */
1032 ic_dev = dev;
1033 ic_myaddr = b->your_ip;
1034 ic_servaddr = b->server_ip;
1035 if (ic_gateway == NONE && b->relay_ip)
1036 ic_gateway = b->relay_ip;
1037 if (ic_nameservers[0] == NONE)
1038 ic_nameservers[0] = ic_servaddr;
1039 ic_got_reply = IC_BOOTP;
1040
1041 drop_unlock:
1042 /* Show's over. Nothing to see here. */
1043 spin_unlock(&ic_recv_lock);
1044
1045 drop:
1046 /* Throw the packet out. */
1047 kfree_skb(skb);
1048
1049 return 0;
1050 }
1051
1052
1053 #endif
1054
1055
1056 /*
1057 * Dynamic IP configuration -- DHCP, BOOTP, RARP.
1058 */
1059
1060 #ifdef IPCONFIG_DYNAMIC
1061
1062 static int __init ic_dynamic(void)
1063 {
1064 int retries;
1065 struct ic_device *d;
1066 unsigned long start_jiffies, timeout, jiff;
1067 int do_bootp = ic_proto_have_if & IC_BOOTP;
1068 int do_rarp = ic_proto_have_if & IC_RARP;
1069
1070 /*
1071 * If none of DHCP/BOOTP/RARP was selected, return with an error.
1072 * This routine gets only called when some pieces of information
1073 * are missing, and without DHCP/BOOTP/RARP we are unable to get it.
1074 */
1075 if (!ic_proto_enabled) {
1076 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
1077 return -1;
1078 }
1079
1080 #ifdef IPCONFIG_BOOTP
1081 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
1082 printk(KERN_ERR "DHCP/BOOTP: No suitable device found.\n");
1083 #endif
1084 #ifdef IPCONFIG_RARP
1085 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)
1086 printk(KERN_ERR "RARP: No suitable device found.\n");
1087 #endif
1088
1089 if (!ic_proto_have_if)
1090 /* Error message already printed */
1091 return -1;
1092
1093 /*
1094 * Setup protocols
1095 */
1096 #ifdef IPCONFIG_BOOTP
1097 if (do_bootp)
1098 ic_bootp_init();
1099 #endif
1100 #ifdef IPCONFIG_RARP
1101 if (do_rarp)
1102 ic_rarp_init();
1103 #endif
1104
1105 /*
1106 * Send requests and wait, until we get an answer. This loop
1107 * seems to be a terrible waste of CPU time, but actually there is
1108 * only one process running at all, so we don't need to use any
1109 * scheduler functions.
1110 * [Actually we could now, but the nothing else running note still
1111 * applies.. - AC]
1112 */
1113 printk(KERN_NOTICE "Sending %s%s%s requests .",
1114 do_bootp
1115 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "",
1116 (do_bootp && do_rarp) ? " and " : "",
1117 do_rarp ? "RARP" : "");
1118
1119 start_jiffies = jiffies;
1120 d = ic_first_dev;
1121 retries = CONF_SEND_RETRIES;
1122 get_random_bytes(&timeout, sizeof(timeout));
1123 timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned) CONF_TIMEOUT_RANDOM);
1124 for (;;) {
1125 #ifdef IPCONFIG_BOOTP
1126 if (do_bootp && (d->able & IC_BOOTP))
1127 ic_bootp_send_if(d, jiffies - start_jiffies);
1128 #endif
1129 #ifdef IPCONFIG_RARP
1130 if (do_rarp && (d->able & IC_RARP))
1131 ic_rarp_send_if(d);
1132 #endif
1133
1134 jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout);
1135 while (time_before(jiffies, jiff) && !ic_got_reply)
1136 schedule_timeout_uninterruptible(1);
1137 #ifdef IPCONFIG_DHCP
1138 /* DHCP isn't done until we get a DHCPACK. */
1139 if ((ic_got_reply & IC_BOOTP)
1140 && (ic_proto_enabled & IC_USE_DHCP)
1141 && ic_dhcp_msgtype != DHCPACK)
1142 {
1143 ic_got_reply = 0;
1144 printk(",");
1145 continue;
1146 }
1147 #endif /* IPCONFIG_DHCP */
1148
1149 if (ic_got_reply) {
1150 printk(" OK\n");
1151 break;
1152 }
1153
1154 if ((d = d->next))
1155 continue;
1156
1157 if (! --retries) {
1158 printk(" timed out!\n");
1159 break;
1160 }
1161
1162 d = ic_first_dev;
1163
1164 timeout = timeout CONF_TIMEOUT_MULT;
1165 if (timeout > CONF_TIMEOUT_MAX)
1166 timeout = CONF_TIMEOUT_MAX;
1167
1168 printk(".");
1169 }
1170
1171 #ifdef IPCONFIG_BOOTP
1172 if (do_bootp)
1173 ic_bootp_cleanup();
1174 #endif
1175 #ifdef IPCONFIG_RARP
1176 if (do_rarp)
1177 ic_rarp_cleanup();
1178 #endif
1179
1180 if (!ic_got_reply) {
1181 ic_myaddr = NONE;
1182 return -1;
1183 }
1184
1185 printk("IP-Config: Got %s answer from %u.%u.%u.%u, ",
1186 ((ic_got_reply & IC_RARP) ? "RARP"
1187 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),
1188 NIPQUAD(ic_servaddr));
1189 printk("my address is %u.%u.%u.%u\n", NIPQUAD(ic_myaddr));
1190
1191 return 0;
1192 }
1193
1194 #endif /* IPCONFIG_DYNAMIC */
1195
1196 #ifdef CONFIG_PROC_FS
1197
1198 static int pnp_seq_show(struct seq_file *seq, void *v)
1199 {
1200 int i;
1201
1202 if (ic_proto_used & IC_PROTO)
1203 seq_printf(seq, "#PROTO: %s\n",
1204 (ic_proto_used & IC_RARP) ? "RARP"
1205 : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP");
1206 else
1207 seq_puts(seq, "#MANUAL\n");
1208
1209 if (ic_domain[0])
1210 seq_printf(seq,
1211 "domain %s\n", ic_domain);
1212 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {
1213 if (ic_nameservers[i] != NONE)
1214 seq_printf(seq,
1215 "nameserver %u.%u.%u.%u\n",
1216 NIPQUAD(ic_nameservers[i]));
1217 }
1218 if (ic_servaddr != NONE)
1219 seq_printf(seq,
1220 "bootserver %u.%u.%u.%u\n",
1221 NIPQUAD(ic_servaddr));
1222 return 0;
1223 }
1224
1225 static int pnp_seq_open(struct inode *indoe, struct file *file)
1226 {
1227 return single_open(file, pnp_seq_show, NULL);
1228 }
1229
1230 static const struct file_operations pnp_seq_fops = {
1231 .owner = THIS_MODULE,
1232 .open = pnp_seq_open,
1233 .read = seq_read,
1234 .llseek = seq_lseek,
1235 .release = single_release,
1236 };
1237 #endif /* CONFIG_PROC_FS */
1238
1239 /*
1240 * Extract IP address from the parameter string if needed. Note that we
1241 * need to have root_server_addr set _before_ IPConfig gets called as it
1242 * can override it.
1243 */
1244 __be32 __init root_nfs_parse_addr(char *name)
1245 {
1246 __be32 addr;
1247 int octets = 0;
1248 char *cp, *cq;
1249
1250 cp = cq = name;
1251 while (octets < 4) {
1252 while (*cp >= '0' && *cp <= '9')
1253 cp++;
1254 if (cp == cq || cp - cq > 3)
1255 break;
1256 if (*cp == '.' || octets == 3)
1257 octets++;
1258 if (octets < 4)
1259 cp++;
1260 cq = cp;
1261 }
1262 if (octets == 4 && (*cp == ':' || *cp == '\0')) {
1263 if (*cp == ':')
1264 *cp++ = '\0';
1265 addr = in_aton(name);
1266 memmove(name, cp, strlen(cp) + 1);
1267 } else
1268 addr = NONE;
1269
1270 return addr;
1271 }
1272
1273 /*
1274 * IP Autoconfig dispatcher.
1275 */
1276
1277 static int __init ip_auto_config(void)
1278 {
1279 __be32 addr;
1280
1281 #ifdef CONFIG_PROC_FS
1282 proc_net_fops_create(&init_net, "pnp", S_IRUGO, &pnp_seq_fops);
1283 #endif /* CONFIG_PROC_FS */
1284
1285 if (!ic_enable)
1286 return 0;
1287
1288 DBG(("IP-Config: Entered.\n"));
1289 #ifdef IPCONFIG_DYNAMIC
1290 try_try_again:
1291 #endif
1292 /* Give hardware a chance to settle */
1293 msleep(CONF_PRE_OPEN);
1294
1295 /* Setup all network devices */
1296 if (ic_open_devs() < 0)
1297 return -1;
1298
1299 /* Give drivers a chance to settle */
1300 ssleep(CONF_POST_OPEN);
1301
1302 /*
1303 * If the config information is insufficient (e.g., our IP address or
1304 * IP address of the boot server is missing or we have multiple network
1305 * interfaces and no default was set), use BOOTP or RARP to get the
1306 * missing values.
1307 */
1308 if (ic_myaddr == NONE ||
1309 #ifdef CONFIG_ROOT_NFS
1310 (root_server_addr == NONE
1311 && ic_servaddr == NONE
1312 && ROOT_DEV == Root_NFS) ||
1313 #endif
1314 ic_first_dev->next) {
1315 #ifdef IPCONFIG_DYNAMIC
1316
1317 int retries = CONF_OPEN_RETRIES;
1318
1319 if (ic_dynamic() < 0) {
1320 ic_close_devs();
1321
1322 /*
1323 * I don't know why, but sometimes the
1324 * eepro100 driver (at least) gets upset and
1325 * doesn't work the first time it's opened.
1326 * But then if you close it and reopen it, it
1327 * works just fine. So we need to try that at
1328 * least once before giving up.
1329 *
1330 * Also, if the root will be NFS-mounted, we
1331 * have nowhere to go if DHCP fails. So we
1332 * just have to keep trying forever.
1333 *
1334 * -- Chip
1335 */
1336 #ifdef CONFIG_ROOT_NFS
1337 if (ROOT_DEV == Root_NFS) {
1338 printk(KERN_ERR
1339 "IP-Config: Retrying forever (NFS root)...\n");
1340 goto try_try_again;
1341 }
1342 #endif
1343
1344 if (--retries) {
1345 printk(KERN_ERR
1346 "IP-Config: Reopening network devices...\n");
1347 goto try_try_again;
1348 }
1349
1350 /* Oh, well. At least we tried. */
1351 printk(KERN_ERR "IP-Config: Auto-configuration of network failed.\n");
1352 return -1;
1353 }
1354 #else /* !DYNAMIC */
1355 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
1356 ic_close_devs();
1357 return -1;
1358 #endif /* IPCONFIG_DYNAMIC */
1359 } else {
1360 /* Device selected manually or only one device -> use it */
1361 ic_dev = ic_first_dev->dev;
1362 }
1363
1364 addr = root_nfs_parse_addr(root_server_path);
1365 if (root_server_addr == NONE)
1366 root_server_addr = addr;
1367
1368 /*
1369 * Use defaults whereever applicable.
1370 */
1371 if (ic_defaults() < 0)
1372 return -1;
1373
1374 /*
1375 * Close all network devices except the device we've
1376 * autoconfigured and set up routes.
1377 */
1378 ic_close_devs();
1379 if (ic_setup_if() < 0 || ic_setup_routes() < 0)
1380 return -1;
1381
1382 /*
1383 * Record which protocol was actually used.
1384 */
1385 #ifdef IPCONFIG_DYNAMIC
1386 ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP);
1387 #endif
1388
1389 #ifndef IPCONFIG_SILENT
1390 /*
1391 * Clue in the operator.
1392 */
1393 printk("IP-Config: Complete:");
1394 printk("\n device=%s", ic_dev->name);
1395 printk(", addr=%u.%u.%u.%u", NIPQUAD(ic_myaddr));
1396 printk(", mask=%u.%u.%u.%u", NIPQUAD(ic_netmask));
1397 printk(", gw=%u.%u.%u.%u", NIPQUAD(ic_gateway));
1398 printk(",\n host=%s, domain=%s, nis-domain=%s",
1399 utsname()->nodename, ic_domain, utsname()->domainname);
1400 printk(",\n bootserver=%u.%u.%u.%u", NIPQUAD(ic_servaddr));
1401 printk(", rootserver=%u.%u.%u.%u", NIPQUAD(root_server_addr));
1402 printk(", rootpath=%s", root_server_path);
1403 printk("\n");
1404 #endif /* !SILENT */
1405
1406 return 0;
1407 }
1408
1409 late_initcall(ip_auto_config);
1410
1411
1412 /*
1413 * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
1414 * command line parameter. See Documentation/filesystems/nfsroot.txt.
1415 */
1416 static int __init ic_proto_name(char *name)
1417 {
1418 if (!strcmp(name, "on") || !strcmp(name, "any")) {
1419 return 1;
1420 }
1421 if (!strcmp(name, "off") || !strcmp(name, "none")) {
1422 return 0;
1423 }
1424 #ifdef CONFIG_IP_PNP_DHCP
1425 else if (!strcmp(name, "dhcp")) {
1426 ic_proto_enabled &= ~IC_RARP;
1427 return 1;
1428 }
1429 #endif
1430 #ifdef CONFIG_IP_PNP_BOOTP
1431 else if (!strcmp(name, "bootp")) {
1432 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP);
1433 return 1;
1434 }
1435 #endif
1436 #ifdef CONFIG_IP_PNP_RARP
1437 else if (!strcmp(name, "rarp")) {
1438 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP);
1439 return 1;
1440 }
1441 #endif
1442 #ifdef IPCONFIG_DYNAMIC
1443 else if (!strcmp(name, "both")) {
1444 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */
1445 return 1;
1446 }
1447 #endif
1448 return 0;
1449 }
1450
1451 static int __init ip_auto_config_setup(char *addrs)
1452 {
1453 char *cp, *ip, *dp;
1454 int num = 0;
1455
1456 ic_set_manually = 1;
1457 ic_enable = 1;
1458
1459 /*
1460 * If any dhcp, bootp etc options are set, leave autoconfig on
1461 * and skip the below static IP processing.
1462 */
1463 if (ic_proto_name(addrs))
1464 return 1;
1465
1466 /* If no static IP is given, turn off autoconfig and bail. */
1467 if (*addrs == 0 ||
1468 strcmp(addrs, "off") == 0 ||
1469 strcmp(addrs, "none") == 0) {
1470 ic_enable = 0;
1471 return 1;
1472 }
1473
1474 /* Parse string for static IP assignment. */
1475 ip = addrs;
1476 while (ip && *ip) {
1477 if ((cp = strchr(ip, ':')))
1478 *cp++ = '\0';
1479 if (strlen(ip) > 0) {
1480 DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip));
1481 switch (num) {
1482 case 0:
1483 if ((ic_myaddr = in_aton(ip)) == ANY)
1484 ic_myaddr = NONE;
1485 break;
1486 case 1:
1487 if ((ic_servaddr = in_aton(ip)) == ANY)
1488 ic_servaddr = NONE;
1489 break;
1490 case 2:
1491 if ((ic_gateway = in_aton(ip)) == ANY)
1492 ic_gateway = NONE;
1493 break;
1494 case 3:
1495 if ((ic_netmask = in_aton(ip)) == ANY)
1496 ic_netmask = NONE;
1497 break;
1498 case 4:
1499 if ((dp = strchr(ip, '.'))) {
1500 *dp++ = '\0';
1501 strlcpy(utsname()->domainname, dp,
1502 sizeof(utsname()->domainname));
1503 }
1504 strlcpy(utsname()->nodename, ip,
1505 sizeof(utsname()->nodename));
1506 ic_host_name_set = 1;
1507 break;
1508 case 5:
1509 strlcpy(user_dev_name, ip, sizeof(user_dev_name));
1510 break;
1511 case 6:
1512 if (ic_proto_name(ip) == 0 &&
1513 ic_myaddr == NONE) {
1514 ic_enable = 0;
1515 }
1516 break;
1517 }
1518 }
1519 ip = cp;
1520 num++;
1521 }
1522
1523 return 1;
1524 }
1525
1526 static int __init nfsaddrs_config_setup(char *addrs)
1527 {
1528 return ip_auto_config_setup(addrs);
1529 }
1530
1531 static int __init vendor_class_identifier_setup(char *addrs)
1532 {
1533 if (strlcpy(vendor_class_identifier, addrs,
1534 sizeof(vendor_class_identifier))
1535 >= sizeof(vendor_class_identifier))
1536 printk(KERN_WARNING "DHCP: vendorclass too long, truncated to \"%s\"",
1537 vendor_class_identifier);
1538 return 1;
1539 }
1540
1541 __setup("ip=", ip_auto_config_setup);
1542 __setup("nfsaddrs=", nfsaddrs_config_setup);
1543 __setup("dhcpclass=", vendor_class_identifier_setup);
Linux with added FPC-III support