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[NET]: Initialize the network namespace of network devices.
[net-next-2.6.git] / net / ipv4 / ipconfig.c
CommitLineData
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
e905a9ed 15 *
1da177e4
LT		 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
1da177e4
LT		 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>
14c85021 44#include <linux/inetdevice.h>
1da177e4
LT		 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>
457c4cbc 58#include <net/net_namespace.h>
1da177e4
LT		 59#include <net/arp.h>
60#include <net/ip.h>
61#include <net/ipconfig.h>
14c85021 62#include <net/route.h>
1da177e4
LT		 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 */
e905a9ed
YH		 102#define CONF_NAMESERVERS_MAX 3 /* Maximum number of nameservers
103 - '3' from resolv.h */
1da177e4 104
5a874db4 105#define NONE __constant_htonl(INADDR_NONE)
1da177e4
LT		 106
107/*
108 * Public IP configuration
109 */
110
111/* This is used by platforms which might be able to set the ipconfig
112 * variables using firmware environment vars. If this is set, it will
113 * ignore such firmware variables.
114 */
115int ic_set_manually __initdata = 0; /* IPconfig parameters set manually */
116
117static int ic_enable __initdata = 0; /* IP config enabled? */
118
119/* Protocol choice */
120int ic_proto_enabled __initdata = 0
121#ifdef IPCONFIG_BOOTP
122 | IC_BOOTP
123#endif
124#ifdef CONFIG_IP_PNP_DHCP
125 | IC_USE_DHCP
126#endif
127#ifdef IPCONFIG_RARP
128 | IC_RARP
129#endif
130 ;
131
132static int ic_host_name_set __initdata = 0; /* Host name set by us? */
133
5a874db4
AV		 134__be32 ic_myaddr = NONE; /* My IP address */
135static __be32 ic_netmask = NONE; /* Netmask for local subnet */
136__be32 ic_gateway = NONE; /* Gateway IP address */
1da177e4 137
5a874db4 138__be32 ic_servaddr = NONE; /* Boot server IP address */
1da177e4 139
5a874db4 140__be32 root_server_addr = NONE; /* Address of NFS server */
1da177e4
LT		 141u8 root_server_path[256] = { 0, }; /* Path to mount as root */
142
143/* Persistent data: */
144
145static int ic_proto_used; /* Protocol used, if any */
5a874db4 146static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */
1da177e4
LT		 147static u8 ic_domain[64]; /* DNS (not NIS) domain name */
148
149/*
150 * Private state.
151 */
152
153/* Name of user-selected boot device */
154static char user_dev_name[IFNAMSIZ] __initdata = { 0, };
155
156/* Protocols supported by available interfaces */
157static int ic_proto_have_if __initdata = 0;
158
159#ifdef IPCONFIG_DYNAMIC
160static DEFINE_SPINLOCK(ic_recv_lock);
161static volatile int ic_got_reply __initdata = 0; /* Proto(s) that replied */
162#endif
163#ifdef IPCONFIG_DHCP
164static int ic_dhcp_msgtype __initdata = 0; /* DHCP msg type received */
165#endif
166
167
168/*
169 * Network devices
170 */
171
172struct ic_device {
173 struct ic_device *next;
174 struct net_device *dev;
175 unsigned short flags;
176 short able;
5a874db4 177 __be32 xid;
1da177e4
LT		 178};
179
180static struct ic_device *ic_first_dev __initdata = NULL;/* List of open device */
181static struct net_device *ic_dev __initdata = NULL; /* Selected device */
182
183static int __init ic_open_devs(void)
184{
185 struct ic_device *d, **last;
186 struct net_device *dev;
187 unsigned short oflags;
188
189 last = &ic_first_dev;
6756ae4b 190 rtnl_lock();
1da177e4
LT		 191
192 /* bring loopback device up first */
193 if (dev_change_flags(&loopback_dev, loopback_dev.flags | IFF_UP) < 0)
194 printk(KERN_ERR "IP-Config: Failed to open %s\n", loopback_dev.name);
195
7562f876 196 for_each_netdev(dev) {
1da177e4
LT		 197 if (dev == &loopback_dev)
198 continue;
199 if (user_dev_name[0] ? !strcmp(dev->name, user_dev_name) :
200 (!(dev->flags & IFF_LOOPBACK) &&
201 (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) &&
202 strncmp(dev->name, "dummy", 5))) {
203 int able = 0;
204 if (dev->mtu >= 364)
205 able |= IC_BOOTP;
206 else
207 printk(KERN_WARNING "DHCP/BOOTP: Ignoring device %s, MTU %d too small", dev->name, dev->mtu);
208 if (!(dev->flags & IFF_NOARP))
209 able |= IC_RARP;
210 able &= ic_proto_enabled;
211 if (ic_proto_enabled && !able)
212 continue;
213 oflags = dev->flags;
214 if (dev_change_flags(dev, oflags | IFF_UP) < 0) {
215 printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name);
216 continue;
217 }
218 if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) {
6756ae4b 219 rtnl_unlock();
1da177e4
LT		 220 return -1;
221 }
222 d->dev = dev;
223 *last = d;
224 last = &d->next;
225 d->flags = oflags;
226 d->able = able;
227 if (able & IC_BOOTP)
5a874db4 228 get_random_bytes(&d->xid, sizeof(__be32));
1da177e4
LT		 229 else
230 d->xid = 0;
231 ic_proto_have_if |= able;
232 DBG(("IP-Config: %s UP (able=%d, xid=%08x)\n",
233 dev->name, able, d->xid));
234 }
235 }
6756ae4b 236 rtnl_unlock();
1da177e4
LT		 237
238 *last = NULL;
239
240 if (!ic_first_dev) {
241 if (user_dev_name[0])
242 printk(KERN_ERR "IP-Config: Device `%s' not found.\n", user_dev_name);
243 else
244 printk(KERN_ERR "IP-Config: No network devices available.\n");
245 return -1;
246 }
247 return 0;
248}
249
250static void __init ic_close_devs(void)
251{
252 struct ic_device *d, *next;
253 struct net_device *dev;
254
6756ae4b 255 rtnl_lock();
1da177e4
LT		 256 next = ic_first_dev;
257 while ((d = next)) {
258 next = d->next;
259 dev = d->dev;
260 if (dev != ic_dev) {
261 DBG(("IP-Config: Downing %s\n", dev->name));
262 dev_change_flags(dev, d->flags);
263 }
264 kfree(d);
265 }
6756ae4b 266 rtnl_unlock();
1da177e4
LT		 267}
268
269/*
270 * Interface to various network functions.
271 */
272
273static inline void
5a874db4 274set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port)
1da177e4
LT		 275{
276 sin->sin_family = AF_INET;
277 sin->sin_addr.s_addr = addr;
278 sin->sin_port = port;
279}
280
281static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg)
282{
283 int res;
284
285 mm_segment_t oldfs = get_fs();
286 set_fs(get_ds());
287 res = devinet_ioctl(cmd, (struct ifreq __user *) arg);
288 set_fs(oldfs);
289 return res;
290}
291
292static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg)
293{
294 int res;
295
296 mm_segment_t oldfs = get_fs();
297 set_fs(get_ds());
298 res = ip_rt_ioctl(cmd, (void __user *) arg);
299 set_fs(oldfs);
300 return res;
301}
302
303/*
304 * Set up interface addresses and routes.
305 */
306
307static int __init ic_setup_if(void)
308{
309 struct ifreq ir;
310 struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr;
311 int err;
312
313 memset(&ir, 0, sizeof(ir));
314 strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name);
315 set_sockaddr(sin, ic_myaddr, 0);
316 if ((err = ic_dev_ioctl(SIOCSIFADDR, &ir)) < 0) {
317 printk(KERN_ERR "IP-Config: Unable to set interface address (%d).\n", err);
318 return -1;
319 }
320 set_sockaddr(sin, ic_netmask, 0);
321 if ((err = ic_dev_ioctl(SIOCSIFNETMASK, &ir)) < 0) {
322 printk(KERN_ERR "IP-Config: Unable to set interface netmask (%d).\n", err);
323 return -1;
324 }
325 set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0);
326 if ((err = ic_dev_ioctl(SIOCSIFBRDADDR, &ir)) < 0) {
327 printk(KERN_ERR "IP-Config: Unable to set interface broadcast address (%d).\n", err);
328 return -1;
329 }
330 return 0;
331}
332
333static int __init ic_setup_routes(void)
334{
335 /* No need to setup device routes, only the default route... */
336
5a874db4 337 if (ic_gateway != NONE) {
1da177e4
LT		 338 struct rtentry rm;
339 int err;
340
341 memset(&rm, 0, sizeof(rm));
342 if ((ic_gateway ^ ic_myaddr) & ic_netmask) {
343 printk(KERN_ERR "IP-Config: Gateway not on directly connected network.\n");
344 return -1;
345 }
346 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0);
347 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0);
348 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0);
349 rm.rt_flags = RTF_UP | RTF_GATEWAY;
350 if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) {
351 printk(KERN_ERR "IP-Config: Cannot add default route (%d).\n", err);
352 return -1;
353 }
354 }
355
356 return 0;
357}
358
359/*
360 * Fill in default values for all missing parameters.
361 */
362
363static int __init ic_defaults(void)
364{
365 /*
366 * At this point we have no userspace running so need not
367 * claim locks on system_utsname
368 */
e905a9ed 369
1da177e4 370 if (!ic_host_name_set)
96b644bd 371 sprintf(init_utsname()->nodename, "%u.%u.%u.%u", NIPQUAD(ic_myaddr));
1da177e4 372
5a874db4 373 if (root_server_addr == NONE)
1da177e4
LT		 374 root_server_addr = ic_servaddr;
375
5a874db4 376 if (ic_netmask == NONE) {
1da177e4
LT		 377 if (IN_CLASSA(ntohl(ic_myaddr)))
378 ic_netmask = htonl(IN_CLASSA_NET);
379 else if (IN_CLASSB(ntohl(ic_myaddr)))
380 ic_netmask = htonl(IN_CLASSB_NET);
381 else if (IN_CLASSC(ntohl(ic_myaddr)))
382 ic_netmask = htonl(IN_CLASSC_NET);
383 else {
384 printk(KERN_ERR "IP-Config: Unable to guess netmask for address %u.%u.%u.%u\n",
385 NIPQUAD(ic_myaddr));
386 return -1;
387 }
388 printk("IP-Config: Guessing netmask %u.%u.%u.%u\n", NIPQUAD(ic_netmask));
389 }
390
391 return 0;
392}
393
394/*
395 * RARP support.
396 */
397
398#ifdef IPCONFIG_RARP
399
f2ccd8fa 400static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
1da177e4
LT		 401
402static struct packet_type rarp_packet_type __initdata = {
403 .type = __constant_htons(ETH_P_RARP),
404 .func = ic_rarp_recv,
405};
406
407static inline void ic_rarp_init(void)
408{
409 dev_add_pack(&rarp_packet_type);
410}
411
412static inline void ic_rarp_cleanup(void)
413{
414 dev_remove_pack(&rarp_packet_type);
415}
416
417/*
418 * Process received RARP packet.
419 */
420static int __init
f2ccd8fa 421ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
1da177e4
LT		 422{
423 struct arphdr *rarp;
424 unsigned char *rarp_ptr;
5a874db4 425 __be32 sip, tip;
1da177e4
LT		 426 unsigned char *sha, *tha; /* s for "source", t for "target" */
427 struct ic_device *d;
428
429 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
430 return NET_RX_DROP;
431
432 if (!pskb_may_pull(skb, sizeof(struct arphdr)))
433 goto drop;
434
435 /* Basic sanity checks can be done without the lock. */
9c70220b 436 rarp = (struct arphdr *)skb_transport_header(skb);
1da177e4
LT		 437
438 /* If this test doesn't pass, it's not IP, or we should
439 * ignore it anyway.
440 */
441 if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd))
442 goto drop;
443
444 /* If it's not a RARP reply, delete it. */
445 if (rarp->ar_op != htons(ARPOP_RREPLY))
446 goto drop;
447
448 /* If it's not Ethernet, delete it. */
449 if (rarp->ar_pro != htons(ETH_P_IP))
450 goto drop;
451
452 if (!pskb_may_pull(skb,
453 sizeof(struct arphdr) +
454 (2 * dev->addr_len) +
455 (2 * 4)))
456 goto drop;
457
458 /* OK, it is all there and looks valid, process... */
9c70220b 459 rarp = (struct arphdr *)skb_transport_header(skb);
1da177e4
LT		 460 rarp_ptr = (unsigned char *) (rarp + 1);
461
462 /* One reply at a time, please. */
463 spin_lock(&ic_recv_lock);
464
465 /* If we already have a reply, just drop the packet */
466 if (ic_got_reply)
467 goto drop_unlock;
468
469 /* Find the ic_device that the packet arrived on */
470 d = ic_first_dev;
471 while (d && d->dev != dev)
472 d = d->next;
473 if (!d)
474 goto drop_unlock; /* should never happen */
475
476 /* Extract variable-width fields */
477 sha = rarp_ptr;
478 rarp_ptr += dev->addr_len;
479 memcpy(&sip, rarp_ptr, 4);
480 rarp_ptr += 4;
481 tha = rarp_ptr;
482 rarp_ptr += dev->addr_len;
483 memcpy(&tip, rarp_ptr, 4);
484
485 /* Discard packets which are not meant for us. */
486 if (memcmp(tha, dev->dev_addr, dev->addr_len))
487 goto drop_unlock;
488
489 /* Discard packets which are not from specified server. */
5a874db4 490 if (ic_servaddr != NONE && ic_servaddr != sip)
1da177e4
LT		 491 goto drop_unlock;
492
493 /* We have a winner! */
494 ic_dev = dev;
5a874db4 495 if (ic_myaddr == NONE)
1da177e4
LT		 496 ic_myaddr = tip;
497 ic_servaddr = sip;
498 ic_got_reply = IC_RARP;
499
500drop_unlock:
501 /* Show's over. Nothing to see here. */
502 spin_unlock(&ic_recv_lock);
503
504drop:
505 /* Throw the packet out. */
506 kfree_skb(skb);
507 return 0;
508}
509
510
511/*
512 * Send RARP request packet over a single interface.
513 */
514static void __init ic_rarp_send_if(struct ic_device *d)
515{
516 struct net_device *dev = d->dev;
517 arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL,
518 dev->dev_addr, dev->dev_addr);
519}
520#endif
521
522/*
523 * DHCP/BOOTP support.
524 */
525
526#ifdef IPCONFIG_BOOTP
527
528struct bootp_pkt { /* BOOTP packet format */
529 struct iphdr iph; /* IP header */
530 struct udphdr udph; /* UDP header */
531 u8 op; /* 1=request, 2=reply */
532 u8 htype; /* HW address type */
533 u8 hlen; /* HW address length */
534 u8 hops; /* Used only by gateways */
5a874db4
AV		 535 __be32 xid; /* Transaction ID */
536 __be16 secs; /* Seconds since we started */
537 __be16 flags; /* Just what it says */
538 __be32 client_ip; /* Client's IP address if known */
539 __be32 your_ip; /* Assigned IP address */
540 __be32 server_ip; /* (Next, e.g. NFS) Server's IP address */
541 __be32 relay_ip; /* IP address of BOOTP relay */
1da177e4
LT		 542 u8 hw_addr[16]; /* Client's HW address */
543 u8 serv_name[64]; /* Server host name */
544 u8 boot_file[128]; /* Name of boot file */
545 u8 exten[312]; /* DHCP options / BOOTP vendor extensions */
546};
547
548/* packet ops */
549#define BOOTP_REQUEST 1
550#define BOOTP_REPLY 2
551
552/* DHCP message types */
553#define DHCPDISCOVER 1
554#define DHCPOFFER 2
555#define DHCPREQUEST 3
556#define DHCPDECLINE 4
557#define DHCPACK 5
558#define DHCPNAK 6
559#define DHCPRELEASE 7
560#define DHCPINFORM 8
561
f2ccd8fa 562static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
1da177e4
LT		 563
564static struct packet_type bootp_packet_type __initdata = {
565 .type = __constant_htons(ETH_P_IP),
566 .func = ic_bootp_recv,
567};
568
569
570/*
571 * Initialize DHCP/BOOTP extension fields in the request.
572 */
573
574static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 };
575
576#ifdef IPCONFIG_DHCP
577
578static void __init
579ic_dhcp_init_options(u8 *options)
580{
5a874db4 581 u8 mt = ((ic_servaddr == NONE)
1da177e4
LT		 582 ? DHCPDISCOVER : DHCPREQUEST);
583 u8 *e = options;
584
585#ifdef IPCONFIG_DEBUG
586 printk("DHCP: Sending message type %d\n", mt);
587#endif
588
589 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */
590 e += 4;
591
592 *e++ = 53; /* DHCP message type */
593 *e++ = 1;
594 *e++ = mt;
595
596 if (mt == DHCPREQUEST) {
597 *e++ = 54; /* Server ID (IP address) */
598 *e++ = 4;
599 memcpy(e, &ic_servaddr, 4);
600 e += 4;
601
602 *e++ = 50; /* Requested IP address */
603 *e++ = 4;
604 memcpy(e, &ic_myaddr, 4);
605 e += 4;
606 }
607
608 /* always? */
609 {
610 static const u8 ic_req_params[] = {
611 1, /* Subnet mask */
612 3, /* Default gateway */
613 6, /* DNS server */
614 12, /* Host name */
615 15, /* Domain name */
616 17, /* Boot path */
617 40, /* NIS domain name */
618 };
619
620 *e++ = 55; /* Parameter request list */
621 *e++ = sizeof(ic_req_params);
622 memcpy(e, ic_req_params, sizeof(ic_req_params));
623 e += sizeof(ic_req_params);
624 }
625
626 *e++ = 255; /* End of the list */
627}
628
629#endif /* IPCONFIG_DHCP */
630
631static void __init ic_bootp_init_ext(u8 *e)
632{
633 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */
634 e += 4;
635 *e++ = 1; /* Subnet mask request */
636 *e++ = 4;
637 e += 4;
638 *e++ = 3; /* Default gateway request */
639 *e++ = 4;
640 e += 4;
641 *e++ = 5; /* Name server request */
642 *e++ = 8;
643 e += 8;
644 *e++ = 12; /* Host name request */
645 *e++ = 32;
646 e += 32;
647 *e++ = 40; /* NIS Domain name request */
648 *e++ = 32;
649 e += 32;
650 *e++ = 17; /* Boot path */
651 *e++ = 40;
652 e += 40;
653
e905a9ed 654 *e++ = 57; /* set extension buffer size for reply */
1da177e4 655 *e++ = 2;
e905a9ed 656 *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */
1da177e4
LT		 657 *e++ = 150;
658
659 *e++ = 255; /* End of the list */
660}
661
662
663/*
664 * Initialize the DHCP/BOOTP mechanism.
665 */
666static inline void ic_bootp_init(void)
667{
668 int i;
669
670 for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
5a874db4 671 ic_nameservers[i] = NONE;
1da177e4
LT		 672
673 dev_add_pack(&bootp_packet_type);
674}
675
676
677/*
678 * DHCP/BOOTP cleanup.
679 */
680static inline void ic_bootp_cleanup(void)
681{
682 dev_remove_pack(&bootp_packet_type);
683}
684
685
686/*
687 * Send DHCP/BOOTP request to single interface.
688 */
689static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff)
690{
691 struct net_device *dev = d->dev;
692 struct sk_buff *skb;
693 struct bootp_pkt *b;
694 int hh_len = LL_RESERVED_SPACE(dev);
695 struct iphdr *h;
696
697 /* Allocate packet */
698 skb = alloc_skb(sizeof(struct bootp_pkt) + hh_len + 15, GFP_KERNEL);
699 if (!skb)
700 return;
701 skb_reserve(skb, hh_len);
702 b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt));
703 memset(b, 0, sizeof(struct bootp_pkt));
704
705 /* Construct IP header */
04b964db 706 skb_reset_network_header(skb);
eddc9ec5 707 h = ip_hdr(skb);
1da177e4
LT		 708 h->version = 4;
709 h->ihl = 5;
710 h->tot_len = htons(sizeof(struct bootp_pkt));
711 h->frag_off = htons(IP_DF);
712 h->ttl = 64;
713 h->protocol = IPPROTO_UDP;
5a874db4 714 h->daddr = htonl(INADDR_BROADCAST);
1da177e4
LT		 715 h->check = ip_fast_csum((unsigned char *) h, h->ihl);
716
717 /* Construct UDP header */
718 b->udph.source = htons(68);
719 b->udph.dest = htons(67);
720 b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr));
721 /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */
722
723 /* Construct DHCP/BOOTP header */
724 b->op = BOOTP_REQUEST;
725 if (dev->type < 256) /* check for false types */
726 b->htype = dev->type;
727 else if (dev->type == ARPHRD_IEEE802_TR) /* fix for token ring */
728 b->htype = ARPHRD_IEEE802;
729 else if (dev->type == ARPHRD_FDDI)
730 b->htype = ARPHRD_ETHER;
731 else {
732 printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name);
733 b->htype = dev->type; /* can cause undefined behavior */
734 }
735 b->hlen = dev->addr_len;
5a874db4
AV		 736 b->your_ip = NONE;
737 b->server_ip = NONE;
1da177e4
LT		 738 memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
739 b->secs = htons(jiffies_diff / HZ);
740 b->xid = d->xid;
741
742 /* add DHCP options or BOOTP extensions */
743#ifdef IPCONFIG_DHCP
744 if (ic_proto_enabled & IC_USE_DHCP)
745 ic_dhcp_init_options(b->exten);
746 else
747#endif
748 ic_bootp_init_ext(b->exten);
749
750 /* Chain packet down the line... */
751 skb->dev = dev;
752 skb->protocol = htons(ETH_P_IP);
753 if ((dev->hard_header &&
754 dev->hard_header(skb, dev, ntohs(skb->protocol), dev->broadcast, dev->dev_addr, skb->len) < 0) ||
755 dev_queue_xmit(skb) < 0)
756 printk("E");
757}
758
759
760/*
761 * Copy BOOTP-supplied string if not already set.
762 */
763static int __init ic_bootp_string(char *dest, char *src, int len, int max)
764{
765 if (!len)
766 return 0;
767 if (len > max-1)
768 len = max-1;
769 memcpy(dest, src, len);
770 dest[len] = '\0';
771 return 1;
772}
773
774
775/*
776 * Process BOOTP extensions.
777 */
778static void __init ic_do_bootp_ext(u8 *ext)
779{
780 u8 servers;
781 int i;
782
783#ifdef IPCONFIG_DEBUG
784 u8 *c;
785
786 printk("DHCP/BOOTP: Got extension %d:",*ext);
132adf54 787 for (c=ext+2; c<ext+2+ext[1]; c++)
1da177e4
LT		 788 printk(" %02x", *c);
789 printk("\n");
790#endif
791
792 switch (*ext++) {
793 case 1: /* Subnet mask */
5a874db4 794 if (ic_netmask == NONE)
1da177e4
LT		 795 memcpy(&ic_netmask, ext+1, 4);
796 break;
797 case 3: /* Default gateway */
5a874db4 798 if (ic_gateway == NONE)
1da177e4
LT		 799 memcpy(&ic_gateway, ext+1, 4);
800 break;
801 case 6: /* DNS server */
802 servers= *ext/4;
803 if (servers > CONF_NAMESERVERS_MAX)
804 servers = CONF_NAMESERVERS_MAX;
805 for (i = 0; i < servers; i++) {
5a874db4 806 if (ic_nameservers[i] == NONE)
1da177e4
LT		 807 memcpy(&ic_nameservers[i], ext+1+4*i, 4);
808 }
809 break;
810 case 12: /* Host name */
e9ff3990 811 ic_bootp_string(utsname()->nodename, ext+1, *ext, __NEW_UTS_LEN);
1da177e4
LT		 812 ic_host_name_set = 1;
813 break;
814 case 15: /* Domain name (DNS) */
815 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
816 break;
817 case 17: /* Root path */
818 if (!root_server_path[0])
819 ic_bootp_string(root_server_path, ext+1, *ext, sizeof(root_server_path));
820 break;
821 case 40: /* NIS Domain name (_not_ DNS) */
e9ff3990 822 ic_bootp_string(utsname()->domainname, ext+1, *ext, __NEW_UTS_LEN);
1da177e4
LT		 823 break;
824 }
825}
826
827
828/*
829 * Receive BOOTP reply.
830 */
f2ccd8fa 831static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
1da177e4
LT		 832{
833 struct bootp_pkt *b;
834 struct iphdr *h;
835 struct ic_device *d;
836 int len, ext_len;
837
838 /* Perform verifications before taking the lock. */
839 if (skb->pkt_type == PACKET_OTHERHOST)
840 goto drop;
841
842 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
843 return NET_RX_DROP;
844
845 if (!pskb_may_pull(skb,
846 sizeof(struct iphdr) +
847 sizeof(struct udphdr)))
848 goto drop;
849
eddc9ec5 850 b = (struct bootp_pkt *)skb_network_header(skb);
1da177e4
LT		 851 h = &b->iph;
852
853 if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP)
854 goto drop;
855
856 /* Fragments are not supported */
857 if (h->frag_off & htons(IP_OFFSET | IP_MF)) {
858 if (net_ratelimit())
859 printk(KERN_ERR "DHCP/BOOTP: Ignoring fragmented "
860 "reply.\n");
861 goto drop;
862 }
863
864 if (skb->len < ntohs(h->tot_len))
865 goto drop;
866
867 if (ip_fast_csum((char *) h, h->ihl))
868 goto drop;
869
870 if (b->udph.source != htons(67) || b->udph.dest != htons(68))
871 goto drop;
872
873 if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
874 goto drop;
875
876 len = ntohs(b->udph.len) - sizeof(struct udphdr);
877 ext_len = len - (sizeof(*b) -
878 sizeof(struct iphdr) -
879 sizeof(struct udphdr) -
880 sizeof(b->exten));
881 if (ext_len < 0)
882 goto drop;
883
884 /* Ok the front looks good, make sure we can get at the rest. */
885 if (!pskb_may_pull(skb, skb->len))
886 goto drop;
887
eddc9ec5 888 b = (struct bootp_pkt *)skb_network_header(skb);
1da177e4
LT		 889 h = &b->iph;
890
891 /* One reply at a time, please. */
892 spin_lock(&ic_recv_lock);
893
894 /* If we already have a reply, just drop the packet */
895 if (ic_got_reply)
896 goto drop_unlock;
897
898 /* Find the ic_device that the packet arrived on */
899 d = ic_first_dev;
900 while (d && d->dev != dev)
901 d = d->next;
902 if (!d)
903 goto drop_unlock; /* should never happen */
904
905 /* Is it a reply to our BOOTP request? */
906 if (b->op != BOOTP_REPLY ||
907 b->xid != d->xid) {
908 if (net_ratelimit())
909 printk(KERN_ERR "DHCP/BOOTP: Reply not for us, "
910 "op[%x] xid[%x]\n",
911 b->op, b->xid);
912 goto drop_unlock;
913 }
914
915 /* Parse extensions */
916 if (ext_len >= 4 &&
917 !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */
e905a9ed 918 u8 *end = (u8 *) b + ntohs(b->iph.tot_len);
1da177e4
LT		 919 u8 *ext;
920
921#ifdef IPCONFIG_DHCP
922 if (ic_proto_enabled & IC_USE_DHCP) {
5a874db4 923 __be32 server_id = NONE;
1da177e4
LT		 924 int mt = 0;
925
926 ext = &b->exten[4];
927 while (ext < end && *ext != 0xff) {
928 u8 *opt = ext++;
929 if (*opt == 0) /* Padding */
930 continue;
931 ext += *ext + 1;
932 if (ext >= end)
933 break;
934 switch (*opt) {
935 case 53: /* Message type */
936 if (opt[1])
937 mt = opt[2];
938 break;
939 case 54: /* Server ID (IP address) */
940 if (opt[1] >= 4)
941 memcpy(&server_id, opt + 2, 4);
942 break;
3ff50b79 943 }
1da177e4
LT		 944 }
945
946#ifdef IPCONFIG_DEBUG
947 printk("DHCP: Got message type %d\n", mt);
948#endif
949
950 switch (mt) {
951 case DHCPOFFER:
952 /* While in the process of accepting one offer,
953 * ignore all others.
954 */
5a874db4 955 if (ic_myaddr != NONE)
1da177e4
LT		 956 goto drop_unlock;
957
958 /* Let's accept that offer. */
959 ic_myaddr = b->your_ip;
960 ic_servaddr = server_id;
961#ifdef IPCONFIG_DEBUG
962 printk("DHCP: Offered address %u.%u.%u.%u",
963 NIPQUAD(ic_myaddr));
964 printk(" by server %u.%u.%u.%u\n",
965 NIPQUAD(ic_servaddr));
966#endif
967 /* The DHCP indicated server address takes
968 * precedence over the bootp header one if
969 * they are different.
970 */
5a874db4 971 if ((server_id != NONE) &&
1da177e4
LT		 972 (b->server_ip != server_id))
973 b->server_ip = ic_servaddr;
974 break;
975
976 case DHCPACK:
977 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0)
978 goto drop_unlock;
979
980 /* Yeah! */
981 break;
982
983 default:
984 /* Urque. Forget it*/
5a874db4
AV		 985 ic_myaddr = NONE;
986 ic_servaddr = NONE;
1da177e4 987 goto drop_unlock;
3ff50b79 988 }
1da177e4
LT		 989
990 ic_dhcp_msgtype = mt;
991
992 }
993#endif /* IPCONFIG_DHCP */
994
995 ext = &b->exten[4];
996 while (ext < end && *ext != 0xff) {
997 u8 *opt = ext++;
998 if (*opt == 0) /* Padding */
999 continue;
1000 ext += *ext + 1;
1001 if (ext < end)
1002 ic_do_bootp_ext(opt);
1003 }
1004 }
1005
1006 /* We have a winner! */
1007 ic_dev = dev;
1008 ic_myaddr = b->your_ip;
1009 ic_servaddr = b->server_ip;
5a874db4 1010 if (ic_gateway == NONE && b->relay_ip)
1da177e4 1011 ic_gateway = b->relay_ip;
5a874db4 1012 if (ic_nameservers[0] == NONE)
1da177e4
LT		 1013 ic_nameservers[0] = ic_servaddr;
1014 ic_got_reply = IC_BOOTP;
1015
1016drop_unlock:
1017 /* Show's over. Nothing to see here. */
1018 spin_unlock(&ic_recv_lock);
1019
1020drop:
1021 /* Throw the packet out. */
1022 kfree_skb(skb);
1023
1024 return 0;
e905a9ed 1025}
1da177e4
LT		 1026
1027
1028#endif
1029
1030
1031/*
1032 * Dynamic IP configuration -- DHCP, BOOTP, RARP.
1033 */
1034
1035#ifdef IPCONFIG_DYNAMIC
1036
1037static int __init ic_dynamic(void)
1038{
1039 int retries;
1040 struct ic_device *d;
1041 unsigned long start_jiffies, timeout, jiff;
1042 int do_bootp = ic_proto_have_if & IC_BOOTP;
1043 int do_rarp = ic_proto_have_if & IC_RARP;
1044
1045 /*
1046 * If none of DHCP/BOOTP/RARP was selected, return with an error.
1047 * This routine gets only called when some pieces of information
1048 * are missing, and without DHCP/BOOTP/RARP we are unable to get it.
1049 */
1050 if (!ic_proto_enabled) {
1051 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
1052 return -1;
1053 }
1054
1055#ifdef IPCONFIG_BOOTP
1056 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
1057 printk(KERN_ERR "DHCP/BOOTP: No suitable device found.\n");
1058#endif
1059#ifdef IPCONFIG_RARP
1060 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)
1061 printk(KERN_ERR "RARP: No suitable device found.\n");
1062#endif
1063
1064 if (!ic_proto_have_if)
1065 /* Error message already printed */
1066 return -1;
1067
1068 /*
1069 * Setup protocols
1070 */
1071#ifdef IPCONFIG_BOOTP
1072 if (do_bootp)
1073 ic_bootp_init();
1074#endif
1075#ifdef IPCONFIG_RARP
1076 if (do_rarp)
1077 ic_rarp_init();
1078#endif
1079
1080 /*
1081 * Send requests and wait, until we get an answer. This loop
1082 * seems to be a terrible waste of CPU time, but actually there is
1083 * only one process running at all, so we don't need to use any
1084 * scheduler functions.
e905a9ed 1085 * [Actually we could now, but the nothing else running note still
1da177e4
LT		 1086 * applies.. - AC]
1087 */
1088 printk(KERN_NOTICE "Sending %s%s%s requests .",
1089 do_bootp
1090 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "",
1091 (do_bootp && do_rarp) ? " and " : "",
1092 do_rarp ? "RARP" : "");
1093
1094 start_jiffies = jiffies;
1095 d = ic_first_dev;
1096 retries = CONF_SEND_RETRIES;
1097 get_random_bytes(&timeout, sizeof(timeout));
1098 timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned) CONF_TIMEOUT_RANDOM);
132adf54 1099 for (;;) {
1da177e4
LT		 1100#ifdef IPCONFIG_BOOTP
1101 if (do_bootp && (d->able & IC_BOOTP))
1102 ic_bootp_send_if(d, jiffies - start_jiffies);
1103#endif
1104#ifdef IPCONFIG_RARP
1105 if (do_rarp && (d->able & IC_RARP))
1106 ic_rarp_send_if(d);
1107#endif
1108
1109 jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout);
121caf57
NA		 1110 while (time_before(jiffies, jiff) && !ic_got_reply)
1111 schedule_timeout_uninterruptible(1);
1da177e4
LT		 1112#ifdef IPCONFIG_DHCP
1113 /* DHCP isn't done until we get a DHCPACK. */
1114 if ((ic_got_reply & IC_BOOTP)
1115 && (ic_proto_enabled & IC_USE_DHCP)
1116 && ic_dhcp_msgtype != DHCPACK)
1117 {
1118 ic_got_reply = 0;
1119 printk(",");
1120 continue;
1121 }
1122#endif /* IPCONFIG_DHCP */
1123
1124 if (ic_got_reply) {
1125 printk(" OK\n");
1126 break;
1127 }
1128
1129 if ((d = d->next))
1130 continue;
1131
1132 if (! --retries) {
1133 printk(" timed out!\n");
1134 break;
1135 }
1136
1137 d = ic_first_dev;
1138
1139 timeout = timeout CONF_TIMEOUT_MULT;
1140 if (timeout > CONF_TIMEOUT_MAX)
1141 timeout = CONF_TIMEOUT_MAX;
1142
1143 printk(".");
1144 }
1145
1146#ifdef IPCONFIG_BOOTP
1147 if (do_bootp)
1148 ic_bootp_cleanup();
1149#endif
1150#ifdef IPCONFIG_RARP
1151 if (do_rarp)
1152 ic_rarp_cleanup();
1153#endif
1154
7a1af5d7 1155 if (!ic_got_reply) {
5a874db4 1156 ic_myaddr = NONE;
1da177e4 1157 return -1;
7a1af5d7 1158 }
1da177e4
LT		 1159
1160 printk("IP-Config: Got %s answer from %u.%u.%u.%u, ",
e905a9ed 1161 ((ic_got_reply & IC_RARP) ? "RARP"
1da177e4
LT		 1162 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),
1163 NIPQUAD(ic_servaddr));
1164 printk("my address is %u.%u.%u.%u\n", NIPQUAD(ic_myaddr));
1165
1166 return 0;
1167}
1168
1169#endif /* IPCONFIG_DYNAMIC */
1170
1171#ifdef CONFIG_PROC_FS
1172
1173static int pnp_seq_show(struct seq_file *seq, void *v)
1174{
1175 int i;
1176
1177 if (ic_proto_used & IC_PROTO)
1178 seq_printf(seq, "#PROTO: %s\n",
1179 (ic_proto_used & IC_RARP) ? "RARP"
1180 : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP");
1181 else
1182 seq_puts(seq, "#MANUAL\n");
1183
1184 if (ic_domain[0])
1185 seq_printf(seq,
1186 "domain %s\n", ic_domain);
1187 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {
5a874db4 1188 if (ic_nameservers[i] != NONE)
1da177e4
LT		 1189 seq_printf(seq,
1190 "nameserver %u.%u.%u.%u\n",
1191 NIPQUAD(ic_nameservers[i]));
1192 }
5a874db4 1193 if (ic_servaddr != NONE)
1da177e4
LT		 1194 seq_printf(seq,
1195 "bootserver %u.%u.%u.%u\n",
1196 NIPQUAD(ic_servaddr));
1197 return 0;
1198}
1199
1200static int pnp_seq_open(struct inode *indoe, struct file *file)
1201{
1202 return single_open(file, pnp_seq_show, NULL);
1203}
1204
9a32144e 1205static const struct file_operations pnp_seq_fops = {
1da177e4
LT		 1206 .owner = THIS_MODULE,
1207 .open = pnp_seq_open,
1208 .read = seq_read,
1209 .llseek = seq_lseek,
1210 .release = single_release,
1211};
1212#endif /* CONFIG_PROC_FS */
1213
1214/*
1215 * Extract IP address from the parameter string if needed. Note that we
1216 * need to have root_server_addr set _before_ IPConfig gets called as it
1217 * can override it.
1218 */
5a874db4 1219__be32 __init root_nfs_parse_addr(char *name)
1da177e4 1220{
5a874db4 1221 __be32 addr;
1da177e4
LT		 1222 int octets = 0;
1223 char *cp, *cq;
1224
1225 cp = cq = name;
1226 while (octets < 4) {
1227 while (*cp >= '0' && *cp <= '9')
1228 cp++;
1229 if (cp == cq || cp - cq > 3)
1230 break;
1231 if (*cp == '.' || octets == 3)
1232 octets++;
1233 if (octets < 4)
1234 cp++;
1235 cq = cp;
1236 }
1237 if (octets == 4 && (*cp == ':' || *cp == '\0')) {
1238 if (*cp == ':')
1239 *cp++ = '\0';
1240 addr = in_aton(name);
1241 memmove(name, cp, strlen(cp) + 1);
1242 } else
5a874db4 1243 addr = NONE;
1da177e4
LT		 1244
1245 return addr;
1246}
1247
1248/*
1249 * IP Autoconfig dispatcher.
1250 */
1251
1252static int __init ip_auto_config(void)
1253{
5a874db4 1254 __be32 addr;
1da177e4
LT		 1255
1256#ifdef CONFIG_PROC_FS
457c4cbc 1257 proc_net_fops_create(&init_net, "pnp", S_IRUGO, &pnp_seq_fops);
1da177e4
LT		 1258#endif /* CONFIG_PROC_FS */
1259
1260 if (!ic_enable)
1261 return 0;
1262
1263 DBG(("IP-Config: Entered.\n"));
1264#ifdef IPCONFIG_DYNAMIC
1265 try_try_again:
1266#endif
1267 /* Give hardware a chance to settle */
1268 msleep(CONF_PRE_OPEN);
1269
1270 /* Setup all network devices */
1271 if (ic_open_devs() < 0)
1272 return -1;
1273
1274 /* Give drivers a chance to settle */
1275 ssleep(CONF_POST_OPEN);
1276
1277 /*
1278 * If the config information is insufficient (e.g., our IP address or
1279 * IP address of the boot server is missing or we have multiple network
1280 * interfaces and no default was set), use BOOTP or RARP to get the
1281 * missing values.
1282 */
5a874db4 1283 if (ic_myaddr == NONE ||
1da177e4 1284#ifdef CONFIG_ROOT_NFS
dcbdc93c
JT		 1285 (root_server_addr == NONE
1286 && ic_servaddr == NONE
1287 && ROOT_DEV == Root_NFS) ||
1da177e4
LT		 1288#endif
1289 ic_first_dev->next) {
1290#ifdef IPCONFIG_DYNAMIC
e905a9ed 1291
1da177e4
LT		 1292 int retries = CONF_OPEN_RETRIES;
1293
1294 if (ic_dynamic() < 0) {
1295 ic_close_devs();
1296
1297 /*
1298 * I don't know why, but sometimes the
1299 * eepro100 driver (at least) gets upset and
1300 * doesn't work the first time it's opened.
1301 * But then if you close it and reopen it, it
1302 * works just fine. So we need to try that at
1303 * least once before giving up.
1304 *
1305 * Also, if the root will be NFS-mounted, we
1306 * have nowhere to go if DHCP fails. So we
1307 * just have to keep trying forever.
1308 *
1309 * -- Chip
1310 */
1311#ifdef CONFIG_ROOT_NFS
1312 if (ROOT_DEV == Root_NFS) {
e905a9ed 1313 printk(KERN_ERR
1da177e4
LT		 1314 "IP-Config: Retrying forever (NFS root)...\n");
1315 goto try_try_again;
1316 }
1317#endif
1318
1319 if (--retries) {
e905a9ed 1320 printk(KERN_ERR
1da177e4
LT		 1321 "IP-Config: Reopening network devices...\n");
1322 goto try_try_again;
1323 }
1324
1325 /* Oh, well. At least we tried. */
1326 printk(KERN_ERR "IP-Config: Auto-configuration of network failed.\n");
1327 return -1;
1328 }
1329#else /* !DYNAMIC */
1330 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
1331 ic_close_devs();
1332 return -1;
1333#endif /* IPCONFIG_DYNAMIC */
1334 } else {
1335 /* Device selected manually or only one device -> use it */
1336 ic_dev = ic_first_dev->dev;
1337 }
1338
1339 addr = root_nfs_parse_addr(root_server_path);
5a874db4 1340 if (root_server_addr == NONE)
1da177e4
LT		 1341 root_server_addr = addr;
1342
1343 /*
1344 * Use defaults whereever applicable.
1345 */
1346 if (ic_defaults() < 0)
1347 return -1;
1348
1349 /*
1350 * Close all network devices except the device we've
1351 * autoconfigured and set up routes.
1352 */
1353 ic_close_devs();
1354 if (ic_setup_if() < 0 || ic_setup_routes() < 0)
1355 return -1;
1356
1357 /*
1358 * Record which protocol was actually used.
1359 */
1360#ifdef IPCONFIG_DYNAMIC
1361 ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP);
1362#endif
1363
1364#ifndef IPCONFIG_SILENT
1365 /*
1366 * Clue in the operator.
1367 */
1368 printk("IP-Config: Complete:");
1369 printk("\n device=%s", ic_dev->name);
1370 printk(", addr=%u.%u.%u.%u", NIPQUAD(ic_myaddr));
1371 printk(", mask=%u.%u.%u.%u", NIPQUAD(ic_netmask));
1372 printk(", gw=%u.%u.%u.%u", NIPQUAD(ic_gateway));
1373 printk(",\n host=%s, domain=%s, nis-domain=%s",
e9ff3990 1374 utsname()->nodename, ic_domain, utsname()->domainname);
1da177e4
LT		 1375 printk(",\n bootserver=%u.%u.%u.%u", NIPQUAD(ic_servaddr));
1376 printk(", rootserver=%u.%u.%u.%u", NIPQUAD(root_server_addr));
1377 printk(", rootpath=%s", root_server_path);
1378 printk("\n");
1379#endif /* !SILENT */
1380
1381 return 0;
1382}
1383
1384late_initcall(ip_auto_config);
1385
1386
1387/*
1388 * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
1389 * command line parameter. It consists of option fields separated by colons in
1390 * the following order:
1391 *
1392 * <client-ip>:<server-ip>:<gw-ip>:<netmask>:<host name>:<device>:<PROTO>
1393 *
1394 * Any of the fields can be empty which means to use a default value:
1395 * <client-ip> - address given by BOOTP or RARP
1396 * <server-ip> - address of host returning BOOTP or RARP packet
1397 * <gw-ip> - none, or the address returned by BOOTP
1398 * <netmask> - automatically determined from <client-ip>, or the
1399 * one returned by BOOTP
1400 * <host name> - <client-ip> in ASCII notation, or the name returned
1401 * by BOOTP
1402 * <device> - use all available devices
1403 * <PROTO>:
1404 * off|none - don't do autoconfig at all (DEFAULT)
1405 * on|any - use any configured protocol
1406 * dhcp|bootp|rarp - use only the specified protocol
1407 * both - use both BOOTP and RARP (not DHCP)
1408 */
1409static int __init ic_proto_name(char *name)
1410{
1411 if (!strcmp(name, "on") || !strcmp(name, "any")) {
1412 return 1;
1413 }
1414#ifdef CONFIG_IP_PNP_DHCP
1415 else if (!strcmp(name, "dhcp")) {
1416 ic_proto_enabled &= ~IC_RARP;
1417 return 1;
1418 }
1419#endif
1420#ifdef CONFIG_IP_PNP_BOOTP
1421 else if (!strcmp(name, "bootp")) {
1422 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP);
1423 return 1;
1424 }
1425#endif
1426#ifdef CONFIG_IP_PNP_RARP
1427 else if (!strcmp(name, "rarp")) {
1428 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP);
1429 return 1;
1430 }
1431#endif
1432#ifdef IPCONFIG_DYNAMIC
1433 else if (!strcmp(name, "both")) {
1434 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */
1435 return 1;
1436 }
1437#endif
1438 return 0;
1439}
1440
1441static int __init ip_auto_config_setup(char *addrs)
1442{
1443 char *cp, *ip, *dp;
1444 int num = 0;
1445
1446 ic_set_manually = 1;
1447
e905a9ed
YH		 1448 ic_enable = (*addrs &&
1449 (strcmp(addrs, "off") != 0) &&
1da177e4
LT		 1450 (strcmp(addrs, "none") != 0));
1451 if (!ic_enable)
1452 return 1;
1453
1454 if (ic_proto_name(addrs))
1455 return 1;
1456
1457 /* Parse the whole string */
1458 ip = addrs;
1459 while (ip && *ip) {
1460 if ((cp = strchr(ip, ':')))
1461 *cp++ = '\0';
1462 if (strlen(ip) > 0) {
1463 DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip));
1464 switch (num) {
1465 case 0:
1466 if ((ic_myaddr = in_aton(ip)) == INADDR_ANY)
5a874db4 1467 ic_myaddr = NONE;
1da177e4
LT		 1468 break;
1469 case 1:
1470 if ((ic_servaddr = in_aton(ip)) == INADDR_ANY)
5a874db4 1471 ic_servaddr = NONE;
1da177e4
LT		 1472 break;
1473 case 2:
1474 if ((ic_gateway = in_aton(ip)) == INADDR_ANY)
5a874db4 1475 ic_gateway = NONE;
1da177e4
LT		 1476 break;
1477 case 3:
1478 if ((ic_netmask = in_aton(ip)) == INADDR_ANY)
5a874db4 1479 ic_netmask = NONE;
1da177e4
LT		 1480 break;
1481 case 4:
1482 if ((dp = strchr(ip, '.'))) {
1483 *dp++ = '\0';
e9ff3990
SH		 1484 strlcpy(utsname()->domainname, dp,
1485 sizeof(utsname()->domainname));
1da177e4 1486 }
e9ff3990
SH		 1487 strlcpy(utsname()->nodename, ip,
1488 sizeof(utsname()->nodename));
1da177e4
LT		 1489 ic_host_name_set = 1;
1490 break;
1491 case 5:
1492 strlcpy(user_dev_name, ip, sizeof(user_dev_name));
1493 break;
1494 case 6:
1495 ic_proto_name(ip);
1496 break;
1497 }
1498 }
1499 ip = cp;
1500 num++;
1501 }
1502
1503 return 1;
1504}
1505
1506static int __init nfsaddrs_config_setup(char *addrs)
1507{
1508 return ip_auto_config_setup(addrs);
1509}
1510
1511__setup("ip=", ip_auto_config_setup);
1512__setup("nfsaddrs=", nfsaddrs_config_setup);
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