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[net-next-2.6.git] / net / ipv4 / ipconfig.c
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1da177e4
LT		 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>
43d60661 57#include <linux/nfs_fs.h>
1da177e4
LT		 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 */
112int ic_set_manually __initdata = 0; /* IPconfig parameters set manually */
113
114static int ic_enable __initdata = 0; /* IP config enabled? */
115
116/* Protocol choice */
117int 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
129static int ic_host_name_set __initdata = 0; /* Host name set by us? */
130
131u32 ic_myaddr = INADDR_NONE; /* My IP address */
132static u32 ic_netmask = INADDR_NONE; /* Netmask for local subnet */
133u32 ic_gateway = INADDR_NONE; /* Gateway IP address */
134
135u32 ic_servaddr = INADDR_NONE; /* Boot server IP address */
136
137u32 root_server_addr = INADDR_NONE; /* Address of NFS server */
138u8 root_server_path[256] = { 0, }; /* Path to mount as root */
139
140/* Persistent data: */
141
142static int ic_proto_used; /* Protocol used, if any */
143static u32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */
144static u8 ic_domain[64]; /* DNS (not NIS) domain name */
145
146/*
147 * Private state.
148 */
149
150/* Name of user-selected boot device */
151static char user_dev_name[IFNAMSIZ] __initdata = { 0, };
152
153/* Protocols supported by available interfaces */
154static int ic_proto_have_if __initdata = 0;
155
156#ifdef IPCONFIG_DYNAMIC
157static DEFINE_SPINLOCK(ic_recv_lock);
158static volatile int ic_got_reply __initdata = 0; /* Proto(s) that replied */
159#endif
160#ifdef IPCONFIG_DHCP
161static int ic_dhcp_msgtype __initdata = 0; /* DHCP msg type received */
162#endif
163
164
165/*
166 * Network devices
167 */
168
169struct ic_device {
170 struct ic_device *next;
171 struct net_device *dev;
172 unsigned short flags;
173 short able;
174 u32 xid;
175};
176
177static struct ic_device *ic_first_dev __initdata = NULL;/* List of open device */
178static struct net_device *ic_dev __initdata = NULL; /* Selected device */
179
180static 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
247static 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
270static inline void
271set_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
278static 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
289static 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
304static 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
330static 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
360static 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
f2ccd8fa 397static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
1da177e4
LT		 398
399static struct packet_type rarp_packet_type __initdata = {
400 .type = __constant_htons(ETH_P_RARP),
401 .func = ic_rarp_recv,
402};
403
404static inline void ic_rarp_init(void)
405{
406 dev_add_pack(&rarp_packet_type);
407}
408
409static inline void ic_rarp_cleanup(void)
410{
411 dev_remove_pack(&rarp_packet_type);
412}
413
414/*
415 * Process received RARP packet.
416 */
417static int __init
f2ccd8fa 418ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
1da177e4
LT		 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
497drop_unlock:
498 /* Show's over. Nothing to see here. */
499 spin_unlock(&ic_recv_lock);
500
501drop:
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 */
511static 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
525struct 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
f2ccd8fa 559static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
1da177e4
LT		 560
561static 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
571static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 };
572
573#ifdef IPCONFIG_DHCP
574
575static void __init
576ic_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
628static 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 */
663static 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 */
677static 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 */
686static 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 */
759static 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 */
774static 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 */
f2ccd8fa 827static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
1da177e4
LT		 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
1012drop_unlock:
1013 /* Show's over. Nothing to see here. */
1014 spin_unlock(&ic_recv_lock);
1015
1016drop:
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
1033static 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);
121caf57
NA		 1106 while (time_before(jiffies, jiff) && !ic_got_reply)
1107 schedule_timeout_uninterruptible(1);
1da177e4
LT		 1108#ifdef IPCONFIG_DHCP
1109 /* DHCP isn't done until we get a DHCPACK. */
1110 if ((ic_got_reply & IC_BOOTP)
1111 && (ic_proto_enabled & IC_USE_DHCP)
1112 && ic_dhcp_msgtype != DHCPACK)
1113 {
1114 ic_got_reply = 0;
1115 printk(",");
1116 continue;
1117 }
1118#endif /* IPCONFIG_DHCP */
1119
1120 if (ic_got_reply) {
1121 printk(" OK\n");
1122 break;
1123 }
1124
1125 if ((d = d->next))
1126 continue;
1127
1128 if (! --retries) {
1129 printk(" timed out!\n");
1130 break;
1131 }
1132
1133 d = ic_first_dev;
1134
1135 timeout = timeout CONF_TIMEOUT_MULT;
1136 if (timeout > CONF_TIMEOUT_MAX)
1137 timeout = CONF_TIMEOUT_MAX;
1138
1139 printk(".");
1140 }
1141
1142#ifdef IPCONFIG_BOOTP
1143 if (do_bootp)
1144 ic_bootp_cleanup();
1145#endif
1146#ifdef IPCONFIG_RARP
1147 if (do_rarp)
1148 ic_rarp_cleanup();
1149#endif
1150
7a1af5d7
MB		 1151 if (!ic_got_reply) {
1152 ic_myaddr = INADDR_NONE;
1da177e4 1153 return -1;
7a1af5d7 1154 }
1da177e4
LT		 1155
1156 printk("IP-Config: Got %s answer from %u.%u.%u.%u, ",
1157 ((ic_got_reply & IC_RARP) ? "RARP"
1158 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),
1159 NIPQUAD(ic_servaddr));
1160 printk("my address is %u.%u.%u.%u\n", NIPQUAD(ic_myaddr));
1161
1162 return 0;
1163}
1164
1165#endif /* IPCONFIG_DYNAMIC */
1166
1167#ifdef CONFIG_PROC_FS
1168
1169static int pnp_seq_show(struct seq_file *seq, void *v)
1170{
1171 int i;
1172
1173 if (ic_proto_used & IC_PROTO)
1174 seq_printf(seq, "#PROTO: %s\n",
1175 (ic_proto_used & IC_RARP) ? "RARP"
1176 : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP");
1177 else
1178 seq_puts(seq, "#MANUAL\n");
1179
1180 if (ic_domain[0])
1181 seq_printf(seq,
1182 "domain %s\n", ic_domain);
1183 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {
1184 if (ic_nameservers[i] != INADDR_NONE)
1185 seq_printf(seq,
1186 "nameserver %u.%u.%u.%u\n",
1187 NIPQUAD(ic_nameservers[i]));
1188 }
1189 if (ic_servaddr != INADDR_NONE)
1190 seq_printf(seq,
1191 "bootserver %u.%u.%u.%u\n",
1192 NIPQUAD(ic_servaddr));
1193 return 0;
1194}
1195
1196static int pnp_seq_open(struct inode *indoe, struct file *file)
1197{
1198 return single_open(file, pnp_seq_show, NULL);
1199}
1200
1201static struct file_operations pnp_seq_fops = {
1202 .owner = THIS_MODULE,
1203 .open = pnp_seq_open,
1204 .read = seq_read,
1205 .llseek = seq_lseek,
1206 .release = single_release,
1207};
1208#endif /* CONFIG_PROC_FS */
1209
1210/*
1211 * Extract IP address from the parameter string if needed. Note that we
1212 * need to have root_server_addr set _before_ IPConfig gets called as it
1213 * can override it.
1214 */
1215u32 __init root_nfs_parse_addr(char *name)
1216{
1217 u32 addr;
1218 int octets = 0;
1219 char *cp, *cq;
1220
1221 cp = cq = name;
1222 while (octets < 4) {
1223 while (*cp >= '0' && *cp <= '9')
1224 cp++;
1225 if (cp == cq || cp - cq > 3)
1226 break;
1227 if (*cp == '.' || octets == 3)
1228 octets++;
1229 if (octets < 4)
1230 cp++;
1231 cq = cp;
1232 }
1233 if (octets == 4 && (*cp == ':' || *cp == '\0')) {
1234 if (*cp == ':')
1235 *cp++ = '\0';
1236 addr = in_aton(name);
1237 memmove(name, cp, strlen(cp) + 1);
1238 } else
1239 addr = INADDR_NONE;
1240
1241 return addr;
1242}
1243
1244/*
1245 * IP Autoconfig dispatcher.
1246 */
1247
1248static int __init ip_auto_config(void)
1249{
1250 u32 addr;
1251
1252#ifdef CONFIG_PROC_FS
1253 proc_net_fops_create("pnp", S_IRUGO, &pnp_seq_fops);
1254#endif /* CONFIG_PROC_FS */
1255
1256 if (!ic_enable)
1257 return 0;
1258
1259 DBG(("IP-Config: Entered.\n"));
1260#ifdef IPCONFIG_DYNAMIC
1261 try_try_again:
1262#endif
1263 /* Give hardware a chance to settle */
1264 msleep(CONF_PRE_OPEN);
1265
1266 /* Setup all network devices */
1267 if (ic_open_devs() < 0)
1268 return -1;
1269
1270 /* Give drivers a chance to settle */
1271 ssleep(CONF_POST_OPEN);
1272
1273 /*
1274 * If the config information is insufficient (e.g., our IP address or
1275 * IP address of the boot server is missing or we have multiple network
1276 * interfaces and no default was set), use BOOTP or RARP to get the
1277 * missing values.
1278 */
1279 if (ic_myaddr == INADDR_NONE ||
1280#ifdef CONFIG_ROOT_NFS
1281 (MAJOR(ROOT_DEV) == UNNAMED_MAJOR
1282 && root_server_addr == INADDR_NONE
1283 && ic_servaddr == INADDR_NONE) ||
1284#endif
1285 ic_first_dev->next) {
1286#ifdef IPCONFIG_DYNAMIC
1287
1288 int retries = CONF_OPEN_RETRIES;
1289
1290 if (ic_dynamic() < 0) {
1291 ic_close_devs();
1292
1293 /*
1294 * I don't know why, but sometimes the
1295 * eepro100 driver (at least) gets upset and
1296 * doesn't work the first time it's opened.
1297 * But then if you close it and reopen it, it
1298 * works just fine. So we need to try that at
1299 * least once before giving up.
1300 *
1301 * Also, if the root will be NFS-mounted, we
1302 * have nowhere to go if DHCP fails. So we
1303 * just have to keep trying forever.
1304 *
1305 * -- Chip
1306 */
1307#ifdef CONFIG_ROOT_NFS
1308 if (ROOT_DEV == Root_NFS) {
1309 printk(KERN_ERR
1310 "IP-Config: Retrying forever (NFS root)...\n");
1311 goto try_try_again;
1312 }
1313#endif
1314
1315 if (--retries) {
1316 printk(KERN_ERR
1317 "IP-Config: Reopening network devices...\n");
1318 goto try_try_again;
1319 }
1320
1321 /* Oh, well. At least we tried. */
1322 printk(KERN_ERR "IP-Config: Auto-configuration of network failed.\n");
1323 return -1;
1324 }
1325#else /* !DYNAMIC */
1326 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
1327 ic_close_devs();
1328 return -1;
1329#endif /* IPCONFIG_DYNAMIC */
1330 } else {
1331 /* Device selected manually or only one device -> use it */
1332 ic_dev = ic_first_dev->dev;
1333 }
1334
1335 addr = root_nfs_parse_addr(root_server_path);
1336 if (root_server_addr == INADDR_NONE)
1337 root_server_addr = addr;
1338
1339 /*
1340 * Use defaults whereever applicable.
1341 */
1342 if (ic_defaults() < 0)
1343 return -1;
1344
1345 /*
1346 * Close all network devices except the device we've
1347 * autoconfigured and set up routes.
1348 */
1349 ic_close_devs();
1350 if (ic_setup_if() < 0 || ic_setup_routes() < 0)
1351 return -1;
1352
1353 /*
1354 * Record which protocol was actually used.
1355 */
1356#ifdef IPCONFIG_DYNAMIC
1357 ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP);
1358#endif
1359
1360#ifndef IPCONFIG_SILENT
1361 /*
1362 * Clue in the operator.
1363 */
1364 printk("IP-Config: Complete:");
1365 printk("\n device=%s", ic_dev->name);
1366 printk(", addr=%u.%u.%u.%u", NIPQUAD(ic_myaddr));
1367 printk(", mask=%u.%u.%u.%u", NIPQUAD(ic_netmask));
1368 printk(", gw=%u.%u.%u.%u", NIPQUAD(ic_gateway));
1369 printk(",\n host=%s, domain=%s, nis-domain=%s",
1370 system_utsname.nodename, ic_domain, system_utsname.domainname);
1371 printk(",\n bootserver=%u.%u.%u.%u", NIPQUAD(ic_servaddr));
1372 printk(", rootserver=%u.%u.%u.%u", NIPQUAD(root_server_addr));
1373 printk(", rootpath=%s", root_server_path);
1374 printk("\n");
1375#endif /* !SILENT */
1376
1377 return 0;
1378}
1379
1380late_initcall(ip_auto_config);
1381
1382
1383/*
1384 * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
1385 * command line parameter. It consists of option fields separated by colons in
1386 * the following order:
1387 *
1388 * <client-ip>:<server-ip>:<gw-ip>:<netmask>:<host name>:<device>:<PROTO>
1389 *
1390 * Any of the fields can be empty which means to use a default value:
1391 * <client-ip> - address given by BOOTP or RARP
1392 * <server-ip> - address of host returning BOOTP or RARP packet
1393 * <gw-ip> - none, or the address returned by BOOTP
1394 * <netmask> - automatically determined from <client-ip>, or the
1395 * one returned by BOOTP
1396 * <host name> - <client-ip> in ASCII notation, or the name returned
1397 * by BOOTP
1398 * <device> - use all available devices
1399 * <PROTO>:
1400 * off|none - don't do autoconfig at all (DEFAULT)
1401 * on|any - use any configured protocol
1402 * dhcp|bootp|rarp - use only the specified protocol
1403 * both - use both BOOTP and RARP (not DHCP)
1404 */
1405static int __init ic_proto_name(char *name)
1406{
1407 if (!strcmp(name, "on") || !strcmp(name, "any")) {
1408 return 1;
1409 }
1410#ifdef CONFIG_IP_PNP_DHCP
1411 else if (!strcmp(name, "dhcp")) {
1412 ic_proto_enabled &= ~IC_RARP;
1413 return 1;
1414 }
1415#endif
1416#ifdef CONFIG_IP_PNP_BOOTP
1417 else if (!strcmp(name, "bootp")) {
1418 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP);
1419 return 1;
1420 }
1421#endif
1422#ifdef CONFIG_IP_PNP_RARP
1423 else if (!strcmp(name, "rarp")) {
1424 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP);
1425 return 1;
1426 }
1427#endif
1428#ifdef IPCONFIG_DYNAMIC
1429 else if (!strcmp(name, "both")) {
1430 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */
1431 return 1;
1432 }
1433#endif
1434 return 0;
1435}
1436
1437static int __init ip_auto_config_setup(char *addrs)
1438{
1439 char *cp, *ip, *dp;
1440 int num = 0;
1441
1442 ic_set_manually = 1;
1443
1444 ic_enable = (*addrs &&
1445 (strcmp(addrs, "off") != 0) &&
1446 (strcmp(addrs, "none") != 0));
1447 if (!ic_enable)
1448 return 1;
1449
1450 if (ic_proto_name(addrs))
1451 return 1;
1452
1453 /* Parse the whole string */
1454 ip = addrs;
1455 while (ip && *ip) {
1456 if ((cp = strchr(ip, ':')))
1457 *cp++ = '\0';
1458 if (strlen(ip) > 0) {
1459 DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip));
1460 switch (num) {
1461 case 0:
1462 if ((ic_myaddr = in_aton(ip)) == INADDR_ANY)
1463 ic_myaddr = INADDR_NONE;
1464 break;
1465 case 1:
1466 if ((ic_servaddr = in_aton(ip)) == INADDR_ANY)
1467 ic_servaddr = INADDR_NONE;
1468 break;
1469 case 2:
1470 if ((ic_gateway = in_aton(ip)) == INADDR_ANY)
1471 ic_gateway = INADDR_NONE;
1472 break;
1473 case 3:
1474 if ((ic_netmask = in_aton(ip)) == INADDR_ANY)
1475 ic_netmask = INADDR_NONE;
1476 break;
1477 case 4:
1478 if ((dp = strchr(ip, '.'))) {
1479 *dp++ = '\0';
1480 strlcpy(system_utsname.domainname, dp,
1481 sizeof(system_utsname.domainname));
1482 }
1483 strlcpy(system_utsname.nodename, ip,
1484 sizeof(system_utsname.nodename));
1485 ic_host_name_set = 1;
1486 break;
1487 case 5:
1488 strlcpy(user_dev_name, ip, sizeof(user_dev_name));
1489 break;
1490 case 6:
1491 ic_proto_name(ip);
1492 break;
1493 }
1494 }
1495 ip = cp;
1496 num++;
1497 }
1498
1499 return 1;
1500}
1501
1502static int __init nfsaddrs_config_setup(char *addrs)
1503{
1504 return ip_auto_config_setup(addrs);
1505}
1506
1507__setup("ip=", ip_auto_config_setup);
1508__setup("nfsaddrs=", nfsaddrs_config_setup);
Clone of davem's net-next-2.6 tree