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ide: Fix irq flags madness
[linux-2.6/linux-mips.git] / net / ipv4 / ipconfig.c
blob472a8c4f1dc0d5ca8c4e447701c63f967e7d2006
1 /*
2 * Automatic Configuration of IP -- use DHCP, BOOTP, RARP, or
3 * user-supplied information to configure own IP address and routes.
4 *
5 * Copyright (C) 1996-1998 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
6 *
7 * Derived from network configuration code in fs/nfs/nfsroot.c,
8 * originally Copyright (C) 1995, 1996 Gero Kuhlmann and me.
9 *
10 * BOOTP rewritten to construct and analyse packets itself instead
11 * of misusing the IP layer. num_bugs_causing_wrong_arp_replies--;
12 * -- MJ, December 1998
13 *
14 * Fixed ip_auto_config_setup calling at startup in the new "Linker Magic"
15 * initialization scheme.
16 * - Arnaldo Carvalho de Melo <acme@conectiva.com.br>, 08/11/1999
17 *
18 * DHCP support added. To users this looks like a whole separate
19 * protocol, but we know it's just a bag on the side of BOOTP.
20 * -- Chip Salzenberg <chip@valinux.com>, May 2000
21 *
22 * Ported DHCP support from 2.2.16 to 2.4.0-test4
23 * -- Eric Biederman <ebiederman@lnxi.com>, 30 Aug 2000
24 *
25 * Merged changes from 2.2.19 into 2.4.3
26 * -- Eric Biederman <ebiederman@lnxi.com>, 22 April Aug 2001
27 *
28 * Multiple Nameservers in /proc/net/pnp
29 * -- Josef Siemes <jsiemes@web.de>, Aug 2002
30 */
31
32 #include <linux/types.h>
33 #include <linux/string.h>
34 #include <linux/kernel.h>
35 #include <linux/jiffies.h>
36 #include <linux/random.h>
37 #include <linux/init.h>
38 #include <linux/utsname.h>
39 #include <linux/in.h>
40 #include <linux/if.h>
41 #include <linux/inet.h>
42 #include <linux/inetdevice.h>
43 #include <linux/netdevice.h>
44 #include <linux/if_arp.h>
45 #include <linux/skbuff.h>
46 #include <linux/ip.h>
47 #include <linux/socket.h>
48 #include <linux/route.h>
49 #include <linux/udp.h>
50 #include <linux/proc_fs.h>
51 #include <linux/seq_file.h>
52 #include <linux/major.h>
53 #include <linux/root_dev.h>
54 #include <linux/delay.h>
55 #include <linux/nfs_fs.h>
56 #include <linux/slab.h>
57 #include <net/net_namespace.h>
58 #include <net/arp.h>
59 #include <net/ip.h>
60 #include <net/ipconfig.h>
61 #include <net/route.h>
62
63 #include <asm/uaccess.h>
64 #include <net/checksum.h>
65 #include <asm/processor.h>
66
67 /* Define this to allow debugging output */
68 #undef IPCONFIG_DEBUG
69
70 #ifdef IPCONFIG_DEBUG
71 #define DBG(x) printk x
72 #else
73 #define DBG(x) do { } while(0)
74 #endif
75
76 #if defined(CONFIG_IP_PNP_DHCP)
77 #define IPCONFIG_DHCP
78 #endif
79 #if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_DHCP)
80 #define IPCONFIG_BOOTP
81 #endif
82 #if defined(CONFIG_IP_PNP_RARP)
83 #define IPCONFIG_RARP
84 #endif
85 #if defined(IPCONFIG_BOOTP) || defined(IPCONFIG_RARP)
86 #define IPCONFIG_DYNAMIC
87 #endif
88
89 /* Define the friendly delay before and after opening net devices */
90 #define CONF_POST_OPEN 10 /* After opening: 10 msecs */
91 #define CONF_CARRIER_TIMEOUT 120000 /* Wait for carrier timeout */
92
93 /* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */
94 #define CONF_OPEN_RETRIES 2 /* (Re)open devices twice */
95 #define CONF_SEND_RETRIES 6 /* Send six requests per open */
96 #define CONF_INTER_TIMEOUT (HZ/2) /* Inter-device timeout: 1/2 second */
97 #define CONF_BASE_TIMEOUT (HZ*2) /* Initial timeout: 2 seconds */
98 #define CONF_TIMEOUT_RANDOM (HZ) /* Maximum amount of randomization */
99 #define CONF_TIMEOUT_MULT *7/4 /* Rate of timeout growth */
100 #define CONF_TIMEOUT_MAX (HZ*30) /* Maximum allowed timeout */
101 #define CONF_NAMESERVERS_MAX 3 /* Maximum number of nameservers
102 - '3' from resolv.h */
103
104 #define NONE cpu_to_be32(INADDR_NONE)
105 #define ANY cpu_to_be32(INADDR_ANY)
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 */
115 int ic_set_manually __initdata = 0; /* IPconfig parameters set manually */
116
117 static int ic_enable __initdata = 0; /* IP config enabled? */
118
119 /* Protocol choice */
120 int 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
132 static int ic_host_name_set __initdata = 0; /* Host name set by us? */
133
134 __be32 ic_myaddr = NONE; /* My IP address */
135 static __be32 ic_netmask = NONE; /* Netmask for local subnet */
136 __be32 ic_gateway = NONE; /* Gateway IP address */
137
138 __be32 ic_servaddr = NONE; /* Boot server IP address */
139
140 __be32 root_server_addr = NONE; /* Address of NFS server */
141 u8 root_server_path[256] = { 0, }; /* Path to mount as root */
142
143 u32 ic_dev_xid; /* Device under configuration */
144
145 /* vendor class identifier */
146 static char vendor_class_identifier[253] __initdata;
147
148 /* Persistent data: */
149
150 static int ic_proto_used; /* Protocol used, if any */
151 static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */
152 static u8 ic_domain[64]; /* DNS (not NIS) domain name */
153
154 /*
155 * Private state.
156 */
157
158 /* Name of user-selected boot device */
159 static char user_dev_name[IFNAMSIZ] __initdata = { 0, };
160
161 /* Protocols supported by available interfaces */
162 static int ic_proto_have_if __initdata = 0;
163
164 /* MTU for boot device */
165 static int ic_dev_mtu __initdata = 0;
166
167 #ifdef IPCONFIG_DYNAMIC
168 static DEFINE_SPINLOCK(ic_recv_lock);
169 static volatile int ic_got_reply __initdata = 0; /* Proto(s) that replied */
170 #endif
171 #ifdef IPCONFIG_DHCP
172 static int ic_dhcp_msgtype __initdata = 0; /* DHCP msg type received */
173 #endif
174
175
176 /*
177 * Network devices
178 */
179
180 struct ic_device {
181 struct ic_device *next;
182 struct net_device *dev;
183 unsigned short flags;
184 short able;
185 __be32 xid;
186 };
187
188 static struct ic_device *ic_first_dev __initdata = NULL;/* List of open device */
189 static struct net_device *ic_dev __initdata = NULL; /* Selected device */
190
191 static bool __init ic_is_init_dev(struct net_device *dev)
192 {
193 if (dev->flags & IFF_LOOPBACK)
194 return false;
195 return user_dev_name[0] ? !strcmp(dev->name, user_dev_name) :
196 (!(dev->flags & IFF_LOOPBACK) &&
197 (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) &&
198 strncmp(dev->name, "dummy", 5));
199 }
200
201 static int __init ic_open_devs(void)
202 {
203 struct ic_device *d, **last;
204 struct net_device *dev;
205 unsigned short oflags;
206 unsigned long start;
207
208 last = &ic_first_dev;
209 rtnl_lock();
210
211 /* bring loopback device up first */
212 for_each_netdev(&init_net, dev) {
213 if (!(dev->flags & IFF_LOOPBACK))
214 continue;
215 if (dev_change_flags(dev, dev->flags | IFF_UP) < 0)
216 printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name);
217 }
218
219 for_each_netdev(&init_net, dev) {
220 if (ic_is_init_dev(dev)) {
221 int able = 0;
222 if (dev->mtu >= 364)
223 able |= IC_BOOTP;
224 else
225 printk(KERN_WARNING "DHCP/BOOTP: Ignoring device %s, MTU %d too small", dev->name, dev->mtu);
226 if (!(dev->flags & IFF_NOARP))
227 able |= IC_RARP;
228 able &= ic_proto_enabled;
229 if (ic_proto_enabled && !able)
230 continue;
231 oflags = dev->flags;
232 if (dev_change_flags(dev, oflags | IFF_UP) < 0) {
233 printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name);
234 continue;
235 }
236 if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) {
237 rtnl_unlock();
238 return -ENOMEM;
239 }
240 d->dev = dev;
241 *last = d;
242 last = &d->next;
243 d->flags = oflags;
244 d->able = able;
245 if (able & IC_BOOTP)
246 get_random_bytes(&d->xid, sizeof(__be32));
247 else
248 d->xid = 0;
249 ic_proto_have_if |= able;
250 DBG(("IP-Config: %s UP (able=%d, xid=%08x)\n",
251 dev->name, able, d->xid));
252 }
253 }
254
255 /* wait for a carrier on at least one device */
256 start = jiffies;
257 while (jiffies - start < msecs_to_jiffies(CONF_CARRIER_TIMEOUT)) {
258 for_each_netdev(&init_net, dev)
259 if (ic_is_init_dev(dev) && netif_carrier_ok(dev))
260 goto have_carrier;
261
262 msleep(1);
263 }
264 have_carrier:
265 rtnl_unlock();
266
267 *last = NULL;
268
269 if (!ic_first_dev) {
270 if (user_dev_name[0])
271 printk(KERN_ERR "IP-Config: Device `%s' not found.\n", user_dev_name);
272 else
273 printk(KERN_ERR "IP-Config: No network devices available.\n");
274 return -ENODEV;
275 }
276 return 0;
277 }
278
279 static void __init ic_close_devs(void)
280 {
281 struct ic_device *d, *next;
282 struct net_device *dev;
283
284 rtnl_lock();
285 next = ic_first_dev;
286 while ((d = next)) {
287 next = d->next;
288 dev = d->dev;
289 if (dev != ic_dev) {
290 DBG(("IP-Config: Downing %s\n", dev->name));
291 dev_change_flags(dev, d->flags);
292 }
293 kfree(d);
294 }
295 rtnl_unlock();
296 }
297
298 /*
299 * Interface to various network functions.
300 */
301
302 static inline void
303 set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port)
304 {
305 sin->sin_family = AF_INET;
306 sin->sin_addr.s_addr = addr;
307 sin->sin_port = port;
308 }
309
310 static int __init ic_devinet_ioctl(unsigned int cmd, struct ifreq *arg)
311 {
312 int res;
313
314 mm_segment_t oldfs = get_fs();
315 set_fs(get_ds());
316 res = devinet_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
317 set_fs(oldfs);
318 return res;
319 }
320
321 static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg)
322 {
323 int res;
324
325 mm_segment_t oldfs = get_fs();
326 set_fs(get_ds());
327 res = dev_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
328 set_fs(oldfs);
329 return res;
330 }
331
332 static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg)
333 {
334 int res;
335
336 mm_segment_t oldfs = get_fs();
337 set_fs(get_ds());
338 res = ip_rt_ioctl(&init_net, cmd, (void __user *) arg);
339 set_fs(oldfs);
340 return res;
341 }
342
343 /*
344 * Set up interface addresses and routes.
345 */
346
347 static int __init ic_setup_if(void)
348 {
349 struct ifreq ir;
350 struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr;
351 int err;
352
353 memset(&ir, 0, sizeof(ir));
354 strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name);
355 set_sockaddr(sin, ic_myaddr, 0);
356 if ((err = ic_devinet_ioctl(SIOCSIFADDR, &ir)) < 0) {
357 printk(KERN_ERR "IP-Config: Unable to set interface address (%d).\n", err);
358 return -1;
359 }
360 set_sockaddr(sin, ic_netmask, 0);
361 if ((err = ic_devinet_ioctl(SIOCSIFNETMASK, &ir)) < 0) {
362 printk(KERN_ERR "IP-Config: Unable to set interface netmask (%d).\n", err);
363 return -1;
364 }
365 set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0);
366 if ((err = ic_devinet_ioctl(SIOCSIFBRDADDR, &ir)) < 0) {
367 printk(KERN_ERR "IP-Config: Unable to set interface broadcast address (%d).\n", err);
368 return -1;
369 }
370 /* Handle the case where we need non-standard MTU on the boot link (a network
371 * using jumbo frames, for instance). If we can't set the mtu, don't error
372 * out, we'll try to muddle along.
373 */
374 if (ic_dev_mtu != 0) {
375 strcpy(ir.ifr_name, ic_dev->name);
376 ir.ifr_mtu = ic_dev_mtu;
377 if ((err = ic_dev_ioctl(SIOCSIFMTU, &ir)) < 0)
378 printk(KERN_ERR "IP-Config: Unable to set interface mtu to %d (%d).\n",
379 ic_dev_mtu, err);
380 }
381 return 0;
382 }
383
384 static int __init ic_setup_routes(void)
385 {
386 /* No need to setup device routes, only the default route... */
387
388 if (ic_gateway != NONE) {
389 struct rtentry rm;
390 int err;
391
392 memset(&rm, 0, sizeof(rm));
393 if ((ic_gateway ^ ic_myaddr) & ic_netmask) {
394 printk(KERN_ERR "IP-Config: Gateway not on directly connected network.\n");
395 return -1;
396 }
397 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0);
398 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0);
399 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0);
400 rm.rt_flags = RTF_UP | RTF_GATEWAY;
401 if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) {
402 printk(KERN_ERR "IP-Config: Cannot add default route (%d).\n", err);
403 return -1;
404 }
405 }
406
407 return 0;
408 }
409
410 /*
411 * Fill in default values for all missing parameters.
412 */
413
414 static int __init ic_defaults(void)
415 {
416 /*
417 * At this point we have no userspace running so need not
418 * claim locks on system_utsname
419 */
420
421 if (!ic_host_name_set)
422 sprintf(init_utsname()->nodename, "%pI4", &ic_myaddr);
423
424 if (root_server_addr == NONE)
425 root_server_addr = ic_servaddr;
426
427 if (ic_netmask == NONE) {
428 if (IN_CLASSA(ntohl(ic_myaddr)))
429 ic_netmask = htonl(IN_CLASSA_NET);
430 else if (IN_CLASSB(ntohl(ic_myaddr)))
431 ic_netmask = htonl(IN_CLASSB_NET);
432 else if (IN_CLASSC(ntohl(ic_myaddr)))
433 ic_netmask = htonl(IN_CLASSC_NET);
434 else {
435 printk(KERN_ERR "IP-Config: Unable to guess netmask for address %pI4\n",
436 &ic_myaddr);
437 return -1;
438 }
439 printk("IP-Config: Guessing netmask %pI4\n", &ic_netmask);
440 }
441
442 return 0;
443 }
444
445 /*
446 * RARP support.
447 */
448
449 #ifdef IPCONFIG_RARP
450
451 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
452
453 static struct packet_type rarp_packet_type __initdata = {
454 .type = cpu_to_be16(ETH_P_RARP),
455 .func = ic_rarp_recv,
456 };
457
458 static inline void __init ic_rarp_init(void)
459 {
460 dev_add_pack(&rarp_packet_type);
461 }
462
463 static inline void __init ic_rarp_cleanup(void)
464 {
465 dev_remove_pack(&rarp_packet_type);
466 }
467
468 /*
469 * Process received RARP packet.
470 */
471 static int __init
472 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
473 {
474 struct arphdr *rarp;
475 unsigned char *rarp_ptr;
476 __be32 sip, tip;
477 unsigned char *sha, *tha; /* s for "source", t for "target" */
478 struct ic_device *d;
479
480 if (!net_eq(dev_net(dev), &init_net))
481 goto drop;
482
483 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
484 return NET_RX_DROP;
485
486 if (!pskb_may_pull(skb, sizeof(struct arphdr)))
487 goto drop;
488
489 /* Basic sanity checks can be done without the lock. */
490 rarp = (struct arphdr *)skb_transport_header(skb);
491
492 /* If this test doesn't pass, it's not IP, or we should
493 * ignore it anyway.
494 */
495 if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd))
496 goto drop;
497
498 /* If it's not a RARP reply, delete it. */
499 if (rarp->ar_op != htons(ARPOP_RREPLY))
500 goto drop;
501
502 /* If it's not Ethernet, delete it. */
503 if (rarp->ar_pro != htons(ETH_P_IP))
504 goto drop;
505
506 if (!pskb_may_pull(skb, arp_hdr_len(dev)))
507 goto drop;
508
509 /* OK, it is all there and looks valid, process... */
510 rarp = (struct arphdr *)skb_transport_header(skb);
511 rarp_ptr = (unsigned char *) (rarp + 1);
512
513 /* One reply at a time, please. */
514 spin_lock(&ic_recv_lock);
515
516 /* If we already have a reply, just drop the packet */
517 if (ic_got_reply)
518 goto drop_unlock;
519
520 /* Find the ic_device that the packet arrived on */
521 d = ic_first_dev;
522 while (d && d->dev != dev)
523 d = d->next;
524 if (!d)
525 goto drop_unlock; /* should never happen */
526
527 /* Extract variable-width fields */
528 sha = rarp_ptr;
529 rarp_ptr += dev->addr_len;
530 memcpy(&sip, rarp_ptr, 4);
531 rarp_ptr += 4;
532 tha = rarp_ptr;
533 rarp_ptr += dev->addr_len;
534 memcpy(&tip, rarp_ptr, 4);
535
536 /* Discard packets which are not meant for us. */
537 if (memcmp(tha, dev->dev_addr, dev->addr_len))
538 goto drop_unlock;
539
540 /* Discard packets which are not from specified server. */
541 if (ic_servaddr != NONE && ic_servaddr != sip)
542 goto drop_unlock;
543
544 /* We have a winner! */
545 ic_dev = dev;
546 if (ic_myaddr == NONE)
547 ic_myaddr = tip;
548 ic_servaddr = sip;
549 ic_got_reply = IC_RARP;
550
551 drop_unlock:
552 /* Show's over. Nothing to see here. */
553 spin_unlock(&ic_recv_lock);
554
555 drop:
556 /* Throw the packet out. */
557 kfree_skb(skb);
558 return 0;
559 }
560
561
562 /*
563 * Send RARP request packet over a single interface.
564 */
565 static void __init ic_rarp_send_if(struct ic_device *d)
566 {
567 struct net_device *dev = d->dev;
568 arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL,
569 dev->dev_addr, dev->dev_addr);
570 }
571 #endif
572
573 /*
574 * DHCP/BOOTP support.
575 */
576
577 #ifdef IPCONFIG_BOOTP
578
579 struct bootp_pkt { /* BOOTP packet format */
580 struct iphdr iph; /* IP header */
581 struct udphdr udph; /* UDP header */
582 u8 op; /* 1=request, 2=reply */
583 u8 htype; /* HW address type */
584 u8 hlen; /* HW address length */
585 u8 hops; /* Used only by gateways */
586 __be32 xid; /* Transaction ID */
587 __be16 secs; /* Seconds since we started */
588 __be16 flags; /* Just what it says */
589 __be32 client_ip; /* Client's IP address if known */
590 __be32 your_ip; /* Assigned IP address */
591 __be32 server_ip; /* (Next, e.g. NFS) Server's IP address */
592 __be32 relay_ip; /* IP address of BOOTP relay */
593 u8 hw_addr[16]; /* Client's HW address */
594 u8 serv_name[64]; /* Server host name */
595 u8 boot_file[128]; /* Name of boot file */
596 u8 exten[312]; /* DHCP options / BOOTP vendor extensions */
597 };
598
599 /* packet ops */
600 #define BOOTP_REQUEST 1
601 #define BOOTP_REPLY 2
602
603 /* DHCP message types */
604 #define DHCPDISCOVER 1
605 #define DHCPOFFER 2
606 #define DHCPREQUEST 3
607 #define DHCPDECLINE 4
608 #define DHCPACK 5
609 #define DHCPNAK 6
610 #define DHCPRELEASE 7
611 #define DHCPINFORM 8
612
613 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
614
615 static struct packet_type bootp_packet_type __initdata = {
616 .type = cpu_to_be16(ETH_P_IP),
617 .func = ic_bootp_recv,
618 };
619
620
621 /*
622 * Initialize DHCP/BOOTP extension fields in the request.
623 */
624
625 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 };
626
627 #ifdef IPCONFIG_DHCP
628
629 static void __init
630 ic_dhcp_init_options(u8 *options)
631 {
632 u8 mt = ((ic_servaddr == NONE)
633 ? DHCPDISCOVER : DHCPREQUEST);
634 u8 *e = options;
635 int len;
636
637 #ifdef IPCONFIG_DEBUG
638 printk("DHCP: Sending message type %d\n", mt);
639 #endif
640
641 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */
642 e += 4;
643
644 *e++ = 53; /* DHCP message type */
645 *e++ = 1;
646 *e++ = mt;
647
648 if (mt == DHCPREQUEST) {
649 *e++ = 54; /* Server ID (IP address) */
650 *e++ = 4;
651 memcpy(e, &ic_servaddr, 4);
652 e += 4;
653
654 *e++ = 50; /* Requested IP address */
655 *e++ = 4;
656 memcpy(e, &ic_myaddr, 4);
657 e += 4;
658 }
659
660 /* always? */
661 {
662 static const u8 ic_req_params[] = {
663 1, /* Subnet mask */
664 3, /* Default gateway */
665 6, /* DNS server */
666 12, /* Host name */
667 15, /* Domain name */
668 17, /* Boot path */
669 26, /* MTU */
670 40, /* NIS domain name */
671 };
672
673 *e++ = 55; /* Parameter request list */
674 *e++ = sizeof(ic_req_params);
675 memcpy(e, ic_req_params, sizeof(ic_req_params));
676 e += sizeof(ic_req_params);
677
678 if (ic_host_name_set) {
679 *e++ = 12; /* host-name */
680 len = strlen(utsname()->nodename);
681 *e++ = len;
682 memcpy(e, utsname()->nodename, len);
683 e += len;
684 }
685 if (*vendor_class_identifier) {
686 printk(KERN_INFO "DHCP: sending class identifier \"%s\"\n",
687 vendor_class_identifier);
688 *e++ = 60; /* Class-identifier */
689 len = strlen(vendor_class_identifier);
690 *e++ = len;
691 memcpy(e, vendor_class_identifier, len);
692 e += len;
693 }
694 }
695
696 *e++ = 255; /* End of the list */
697 }
698
699 #endif /* IPCONFIG_DHCP */
700
701 static void __init ic_bootp_init_ext(u8 *e)
702 {
703 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */
704 e += 4;
705 *e++ = 1; /* Subnet mask request */
706 *e++ = 4;
707 e += 4;
708 *e++ = 3; /* Default gateway request */
709 *e++ = 4;
710 e += 4;
711 *e++ = 5; /* Name server request */
712 *e++ = 8;
713 e += 8;
714 *e++ = 12; /* Host name request */
715 *e++ = 32;
716 e += 32;
717 *e++ = 40; /* NIS Domain name request */
718 *e++ = 32;
719 e += 32;
720 *e++ = 17; /* Boot path */
721 *e++ = 40;
722 e += 40;
723
724 *e++ = 57; /* set extension buffer size for reply */
725 *e++ = 2;
726 *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */
727 *e++ = 150;
728
729 *e++ = 255; /* End of the list */
730 }
731
732
733 /*
734 * Initialize the DHCP/BOOTP mechanism.
735 */
736 static inline void __init ic_bootp_init(void)
737 {
738 int i;
739
740 for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
741 ic_nameservers[i] = NONE;
742
743 dev_add_pack(&bootp_packet_type);
744 }
745
746
747 /*
748 * DHCP/BOOTP cleanup.
749 */
750 static inline void __init ic_bootp_cleanup(void)
751 {
752 dev_remove_pack(&bootp_packet_type);
753 }
754
755
756 /*
757 * Send DHCP/BOOTP request to single interface.
758 */
759 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff)
760 {
761 struct net_device *dev = d->dev;
762 struct sk_buff *skb;
763 struct bootp_pkt *b;
764 struct iphdr *h;
765
766 /* Allocate packet */
767 skb = alloc_skb(sizeof(struct bootp_pkt) + LL_ALLOCATED_SPACE(dev) + 15,
768 GFP_KERNEL);
769 if (!skb)
770 return;
771 skb_reserve(skb, LL_RESERVED_SPACE(dev));
772 b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt));
773 memset(b, 0, sizeof(struct bootp_pkt));
774
775 /* Construct IP header */
776 skb_reset_network_header(skb);
777 h = ip_hdr(skb);
778 h->version = 4;
779 h->ihl = 5;
780 h->tot_len = htons(sizeof(struct bootp_pkt));
781 h->frag_off = htons(IP_DF);
782 h->ttl = 64;
783 h->protocol = IPPROTO_UDP;
784 h->daddr = htonl(INADDR_BROADCAST);
785 h->check = ip_fast_csum((unsigned char *) h, h->ihl);
786
787 /* Construct UDP header */
788 b->udph.source = htons(68);
789 b->udph.dest = htons(67);
790 b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr));
791 /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */
792
793 /* Construct DHCP/BOOTP header */
794 b->op = BOOTP_REQUEST;
795 if (dev->type < 256) /* check for false types */
796 b->htype = dev->type;
797 else if (dev->type == ARPHRD_IEEE802_TR) /* fix for token ring */
798 b->htype = ARPHRD_IEEE802;
799 else if (dev->type == ARPHRD_FDDI)
800 b->htype = ARPHRD_ETHER;
801 else {
802 printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name);
803 b->htype = dev->type; /* can cause undefined behavior */
804 }
805
806 /* server_ip and your_ip address are both already zero per RFC2131 */
807 b->hlen = dev->addr_len;
808 memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
809 b->secs = htons(jiffies_diff / HZ);
810 b->xid = d->xid;
811
812 /* add DHCP options or BOOTP extensions */
813 #ifdef IPCONFIG_DHCP
814 if (ic_proto_enabled & IC_USE_DHCP)
815 ic_dhcp_init_options(b->exten);
816 else
817 #endif
818 ic_bootp_init_ext(b->exten);
819
820 /* Chain packet down the line... */
821 skb->dev = dev;
822 skb->protocol = htons(ETH_P_IP);
823 if (dev_hard_header(skb, dev, ntohs(skb->protocol),
824 dev->broadcast, dev->dev_addr, skb->len) < 0 ||
825 dev_queue_xmit(skb) < 0)
826 printk("E");
827 }
828
829
830 /*
831 * Copy BOOTP-supplied string if not already set.
832 */
833 static int __init ic_bootp_string(char *dest, char *src, int len, int max)
834 {
835 if (!len)
836 return 0;
837 if (len > max-1)
838 len = max-1;
839 memcpy(dest, src, len);
840 dest[len] = '\0';
841 return 1;
842 }
843
844
845 /*
846 * Process BOOTP extensions.
847 */
848 static void __init ic_do_bootp_ext(u8 *ext)
849 {
850 u8 servers;
851 int i;
852 u16 mtu;
853
854 #ifdef IPCONFIG_DEBUG
855 u8 *c;
856
857 printk("DHCP/BOOTP: Got extension %d:",*ext);
858 for (c=ext+2; c<ext+2+ext[1]; c++)
859 printk(" %02x", *c);
860 printk("\n");
861 #endif
862
863 switch (*ext++) {
864 case 1: /* Subnet mask */
865 if (ic_netmask == NONE)
866 memcpy(&ic_netmask, ext+1, 4);
867 break;
868 case 3: /* Default gateway */
869 if (ic_gateway == NONE)
870 memcpy(&ic_gateway, ext+1, 4);
871 break;
872 case 6: /* DNS server */
873 servers= *ext/4;
874 if (servers > CONF_NAMESERVERS_MAX)
875 servers = CONF_NAMESERVERS_MAX;
876 for (i = 0; i < servers; i++) {
877 if (ic_nameservers[i] == NONE)
878 memcpy(&ic_nameservers[i], ext+1+4*i, 4);
879 }
880 break;
881 case 12: /* Host name */
882 ic_bootp_string(utsname()->nodename, ext+1, *ext,
883 __NEW_UTS_LEN);
884 ic_host_name_set = 1;
885 break;
886 case 15: /* Domain name (DNS) */
887 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
888 break;
889 case 17: /* Root path */
890 if (!root_server_path[0])
891 ic_bootp_string(root_server_path, ext+1, *ext,
892 sizeof(root_server_path));
893 break;
894 case 26: /* Interface MTU */
895 memcpy(&mtu, ext+1, sizeof(mtu));
896 ic_dev_mtu = ntohs(mtu);
897 break;
898 case 40: /* NIS Domain name (_not_ DNS) */
899 ic_bootp_string(utsname()->domainname, ext+1, *ext,
900 __NEW_UTS_LEN);
901 break;
902 }
903 }
904
905
906 /*
907 * Receive BOOTP reply.
908 */
909 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
910 {
911 struct bootp_pkt *b;
912 struct iphdr *h;
913 struct ic_device *d;
914 int len, ext_len;
915
916 if (!net_eq(dev_net(dev), &init_net))
917 goto drop;
918
919 /* Perform verifications before taking the lock. */
920 if (skb->pkt_type == PACKET_OTHERHOST)
921 goto drop;
922
923 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
924 return NET_RX_DROP;
925
926 if (!pskb_may_pull(skb,
927 sizeof(struct iphdr) +
928 sizeof(struct udphdr)))
929 goto drop;
930
931 b = (struct bootp_pkt *)skb_network_header(skb);
932 h = &b->iph;
933
934 if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP)
935 goto drop;
936
937 /* Fragments are not supported */
938 if (ip_is_fragment(h)) {
939 if (net_ratelimit())
940 printk(KERN_ERR "DHCP/BOOTP: Ignoring fragmented "
941 "reply.\n");
942 goto drop;
943 }
944
945 if (skb->len < ntohs(h->tot_len))
946 goto drop;
947
948 if (ip_fast_csum((char *) h, h->ihl))
949 goto drop;
950
951 if (b->udph.source != htons(67) || b->udph.dest != htons(68))
952 goto drop;
953
954 if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
955 goto drop;
956
957 len = ntohs(b->udph.len) - sizeof(struct udphdr);
958 ext_len = len - (sizeof(*b) -
959 sizeof(struct iphdr) -
960 sizeof(struct udphdr) -
961 sizeof(b->exten));
962 if (ext_len < 0)
963 goto drop;
964
965 /* Ok the front looks good, make sure we can get at the rest. */
966 if (!pskb_may_pull(skb, skb->len))
967 goto drop;
968
969 b = (struct bootp_pkt *)skb_network_header(skb);
970 h = &b->iph;
971
972 /* One reply at a time, please. */
973 spin_lock(&ic_recv_lock);
974
975 /* If we already have a reply, just drop the packet */
976 if (ic_got_reply)
977 goto drop_unlock;
978
979 /* Find the ic_device that the packet arrived on */
980 d = ic_first_dev;
981 while (d && d->dev != dev)
982 d = d->next;
983 if (!d)
984 goto drop_unlock; /* should never happen */
985
986 /* Is it a reply to our BOOTP request? */
987 if (b->op != BOOTP_REPLY ||
988 b->xid != d->xid) {
989 if (net_ratelimit())
990 printk(KERN_ERR "DHCP/BOOTP: Reply not for us, "
991 "op[%x] xid[%x]\n",
992 b->op, b->xid);
993 goto drop_unlock;
994 }
995
996 /* Is it a reply for the device we are configuring? */
997 if (b->xid != ic_dev_xid) {
998 if (net_ratelimit())
999 printk(KERN_ERR "DHCP/BOOTP: Ignoring delayed packet\n");
1000 goto drop_unlock;
1001 }
1002
1003 /* Parse extensions */
1004 if (ext_len >= 4 &&
1005 !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */
1006 u8 *end = (u8 *) b + ntohs(b->iph.tot_len);
1007 u8 *ext;
1008
1009 #ifdef IPCONFIG_DHCP
1010 if (ic_proto_enabled & IC_USE_DHCP) {
1011 __be32 server_id = NONE;
1012 int mt = 0;
1013
1014 ext = &b->exten[4];
1015 while (ext < end && *ext != 0xff) {
1016 u8 *opt = ext++;
1017 if (*opt == 0) /* Padding */
1018 continue;
1019 ext += *ext + 1;
1020 if (ext >= end)
1021 break;
1022 switch (*opt) {
1023 case 53: /* Message type */
1024 if (opt[1])
1025 mt = opt[2];
1026 break;
1027 case 54: /* Server ID (IP address) */
1028 if (opt[1] >= 4)
1029 memcpy(&server_id, opt + 2, 4);
1030 break;
1031 }
1032 }
1033
1034 #ifdef IPCONFIG_DEBUG
1035 printk("DHCP: Got message type %d\n", mt);
1036 #endif
1037
1038 switch (mt) {
1039 case DHCPOFFER:
1040 /* While in the process of accepting one offer,
1041 * ignore all others.
1042 */
1043 if (ic_myaddr != NONE)
1044 goto drop_unlock;
1045
1046 /* Let's accept that offer. */
1047 ic_myaddr = b->your_ip;
1048 ic_servaddr = server_id;
1049 #ifdef IPCONFIG_DEBUG
1050 printk("DHCP: Offered address %pI4 by server %pI4\n",
1051 &ic_myaddr, &ic_servaddr);
1052 #endif
1053 /* The DHCP indicated server address takes
1054 * precedence over the bootp header one if
1055 * they are different.
1056 */
1057 if ((server_id != NONE) &&
1058 (b->server_ip != server_id))
1059 b->server_ip = ic_servaddr;
1060 break;
1061
1062 case DHCPACK:
1063 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0)
1064 goto drop_unlock;
1065
1066 /* Yeah! */
1067 break;
1068
1069 default:
1070 /* Urque. Forget it*/
1071 ic_myaddr = NONE;
1072 ic_servaddr = NONE;
1073 goto drop_unlock;
1074 }
1075
1076 ic_dhcp_msgtype = mt;
1077
1078 }
1079 #endif /* IPCONFIG_DHCP */
1080
1081 ext = &b->exten[4];
1082 while (ext < end && *ext != 0xff) {
1083 u8 *opt = ext++;
1084 if (*opt == 0) /* Padding */
1085 continue;
1086 ext += *ext + 1;
1087 if (ext < end)
1088 ic_do_bootp_ext(opt);
1089 }
1090 }
1091
1092 /* We have a winner! */
1093 ic_dev = dev;
1094 ic_myaddr = b->your_ip;
1095 ic_servaddr = b->server_ip;
1096 if (ic_gateway == NONE && b->relay_ip)
1097 ic_gateway = b->relay_ip;
1098 if (ic_nameservers[0] == NONE)
1099 ic_nameservers[0] = ic_servaddr;
1100 ic_got_reply = IC_BOOTP;
1101
1102 drop_unlock:
1103 /* Show's over. Nothing to see here. */
1104 spin_unlock(&ic_recv_lock);
1105
1106 drop:
1107 /* Throw the packet out. */
1108 kfree_skb(skb);
1109
1110 return 0;
1111 }
1112
1113
1114 #endif
1115
1116
1117 /*
1118 * Dynamic IP configuration -- DHCP, BOOTP, RARP.
1119 */
1120
1121 #ifdef IPCONFIG_DYNAMIC
1122
1123 static int __init ic_dynamic(void)
1124 {
1125 int retries;
1126 struct ic_device *d;
1127 unsigned long start_jiffies, timeout, jiff;
1128 int do_bootp = ic_proto_have_if & IC_BOOTP;
1129 int do_rarp = ic_proto_have_if & IC_RARP;
1130
1131 /*
1132 * If none of DHCP/BOOTP/RARP was selected, return with an error.
1133 * This routine gets only called when some pieces of information
1134 * are missing, and without DHCP/BOOTP/RARP we are unable to get it.
1135 */
1136 if (!ic_proto_enabled) {
1137 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
1138 return -1;
1139 }
1140
1141 #ifdef IPCONFIG_BOOTP
1142 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
1143 printk(KERN_ERR "DHCP/BOOTP: No suitable device found.\n");
1144 #endif
1145 #ifdef IPCONFIG_RARP
1146 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)
1147 printk(KERN_ERR "RARP: No suitable device found.\n");
1148 #endif
1149
1150 if (!ic_proto_have_if)
1151 /* Error message already printed */
1152 return -1;
1153
1154 /*
1155 * Setup protocols
1156 */
1157 #ifdef IPCONFIG_BOOTP
1158 if (do_bootp)
1159 ic_bootp_init();
1160 #endif
1161 #ifdef IPCONFIG_RARP
1162 if (do_rarp)
1163 ic_rarp_init();
1164 #endif
1165
1166 /*
1167 * Send requests and wait, until we get an answer. This loop
1168 * seems to be a terrible waste of CPU time, but actually there is
1169 * only one process running at all, so we don't need to use any
1170 * scheduler functions.
1171 * [Actually we could now, but the nothing else running note still
1172 * applies.. - AC]
1173 */
1174 printk(KERN_NOTICE "Sending %s%s%s requests .",
1175 do_bootp
1176 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "",
1177 (do_bootp && do_rarp) ? " and " : "",
1178 do_rarp ? "RARP" : "");
1179
1180 start_jiffies = jiffies;
1181 d = ic_first_dev;
1182 retries = CONF_SEND_RETRIES;
1183 get_random_bytes(&timeout, sizeof(timeout));
1184 timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned) CONF_TIMEOUT_RANDOM);
1185 for (;;) {
1186 /* Track the device we are configuring */
1187 ic_dev_xid = d->xid;
1188
1189 #ifdef IPCONFIG_BOOTP
1190 if (do_bootp && (d->able & IC_BOOTP))
1191 ic_bootp_send_if(d, jiffies - start_jiffies);
1192 #endif
1193 #ifdef IPCONFIG_RARP
1194 if (do_rarp && (d->able & IC_RARP))
1195 ic_rarp_send_if(d);
1196 #endif
1197
1198 jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout);
1199 while (time_before(jiffies, jiff) && !ic_got_reply)
1200 schedule_timeout_uninterruptible(1);
1201 #ifdef IPCONFIG_DHCP
1202 /* DHCP isn't done until we get a DHCPACK. */
1203 if ((ic_got_reply & IC_BOOTP) &&
1204 (ic_proto_enabled & IC_USE_DHCP) &&
1205 ic_dhcp_msgtype != DHCPACK) {
1206 ic_got_reply = 0;
1207 printk(KERN_CONT ",");
1208 continue;
1209 }
1210 #endif /* IPCONFIG_DHCP */
1211
1212 if (ic_got_reply) {
1213 printk(KERN_CONT " OK\n");
1214 break;
1215 }
1216
1217 if ((d = d->next))
1218 continue;
1219
1220 if (! --retries) {
1221 printk(KERN_CONT " timed out!\n");
1222 break;
1223 }
1224
1225 d = ic_first_dev;
1226
1227 timeout = timeout CONF_TIMEOUT_MULT;
1228 if (timeout > CONF_TIMEOUT_MAX)
1229 timeout = CONF_TIMEOUT_MAX;
1230
1231 printk(KERN_CONT ".");
1232 }
1233
1234 #ifdef IPCONFIG_BOOTP
1235 if (do_bootp)
1236 ic_bootp_cleanup();
1237 #endif
1238 #ifdef IPCONFIG_RARP
1239 if (do_rarp)
1240 ic_rarp_cleanup();
1241 #endif
1242
1243 if (!ic_got_reply) {
1244 ic_myaddr = NONE;
1245 return -1;
1246 }
1247
1248 printk("IP-Config: Got %s answer from %pI4, ",
1249 ((ic_got_reply & IC_RARP) ? "RARP"
1250 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),
1251 &ic_servaddr);
1252 printk(KERN_CONT "my address is %pI4\n", &ic_myaddr);
1253
1254 return 0;
1255 }
1256
1257 #endif /* IPCONFIG_DYNAMIC */
1258
1259 #ifdef CONFIG_PROC_FS
1260
1261 static int pnp_seq_show(struct seq_file *seq, void *v)
1262 {
1263 int i;
1264
1265 if (ic_proto_used & IC_PROTO)
1266 seq_printf(seq, "#PROTO: %s\n",
1267 (ic_proto_used & IC_RARP) ? "RARP"
1268 : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP");
1269 else
1270 seq_puts(seq, "#MANUAL\n");
1271
1272 if (ic_domain[0])
1273 seq_printf(seq,
1274 "domain %s\n", ic_domain);
1275 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {
1276 if (ic_nameservers[i] != NONE)
1277 seq_printf(seq, "nameserver %pI4\n",
1278 &ic_nameservers[i]);
1279 }
1280 if (ic_servaddr != NONE)
1281 seq_printf(seq, "bootserver %pI4\n",
1282 &ic_servaddr);
1283 return 0;
1284 }
1285
1286 static int pnp_seq_open(struct inode *indoe, struct file *file)
1287 {
1288 return single_open(file, pnp_seq_show, NULL);
1289 }
1290
1291 static const struct file_operations pnp_seq_fops = {
1292 .owner = THIS_MODULE,
1293 .open = pnp_seq_open,
1294 .read = seq_read,
1295 .llseek = seq_lseek,
1296 .release = single_release,
1297 };
1298 #endif /* CONFIG_PROC_FS */
1299
1300 /*
1301 * Extract IP address from the parameter string if needed. Note that we
1302 * need to have root_server_addr set _before_ IPConfig gets called as it
1303 * can override it.
1304 */
1305 __be32 __init root_nfs_parse_addr(char *name)
1306 {
1307 __be32 addr;
1308 int octets = 0;
1309 char *cp, *cq;
1310
1311 cp = cq = name;
1312 while (octets < 4) {
1313 while (*cp >= '0' && *cp <= '9')
1314 cp++;
1315 if (cp == cq || cp - cq > 3)
1316 break;
1317 if (*cp == '.' || octets == 3)
1318 octets++;
1319 if (octets < 4)
1320 cp++;
1321 cq = cp;
1322 }
1323 if (octets == 4 && (*cp == ':' || *cp == '\0')) {
1324 if (*cp == ':')
1325 *cp++ = '\0';
1326 addr = in_aton(name);
1327 memmove(name, cp, strlen(cp) + 1);
1328 } else
1329 addr = NONE;
1330
1331 return addr;
1332 }
1333
1334 #define DEVICE_WAIT_MAX 12 /* 12 seconds */
1335
1336 static int __init wait_for_devices(void)
1337 {
1338 int i;
1339
1340 for (i = 0; i < DEVICE_WAIT_MAX; i++) {
1341 struct net_device *dev;
1342 int found = 0;
1343
1344 rtnl_lock();
1345 for_each_netdev(&init_net, dev) {
1346 if (ic_is_init_dev(dev)) {
1347 found = 1;
1348 break;
1349 }
1350 }
1351 rtnl_unlock();
1352 if (found)
1353 return 0;
1354 ssleep(1);
1355 }
1356 return -ENODEV;
1357 }
1358
1359 /*
1360 * IP Autoconfig dispatcher.
1361 */
1362
1363 static int __init ip_auto_config(void)
1364 {
1365 __be32 addr;
1366 #ifdef IPCONFIG_DYNAMIC
1367 int retries = CONF_OPEN_RETRIES;
1368 #endif
1369 int err;
1370
1371 #ifdef CONFIG_PROC_FS
1372 proc_net_fops_create(&init_net, "pnp", S_IRUGO, &pnp_seq_fops);
1373 #endif /* CONFIG_PROC_FS */
1374
1375 if (!ic_enable)
1376 return 0;
1377
1378 DBG(("IP-Config: Entered.\n"));
1379 #ifdef IPCONFIG_DYNAMIC
1380 try_try_again:
1381 #endif
1382 /* Wait for devices to appear */
1383 err = wait_for_devices();
1384 if (err)
1385 return err;
1386
1387 /* Setup all network devices */
1388 err = ic_open_devs();
1389 if (err)
1390 return err;
1391
1392 /* Give drivers a chance to settle */
1393 msleep(CONF_POST_OPEN);
1394
1395 /*
1396 * If the config information is insufficient (e.g., our IP address or
1397 * IP address of the boot server is missing or we have multiple network
1398 * interfaces and no default was set), use BOOTP or RARP to get the
1399 * missing values.
1400 */
1401 if (ic_myaddr == NONE ||
1402 #ifdef CONFIG_ROOT_NFS
1403 (root_server_addr == NONE &&
1404 ic_servaddr == NONE &&
1405 ROOT_DEV == Root_NFS) ||
1406 #endif
1407 ic_first_dev->next) {
1408 #ifdef IPCONFIG_DYNAMIC
1409 if (ic_dynamic() < 0) {
1410 ic_close_devs();
1411
1412 /*
1413 * I don't know why, but sometimes the
1414 * eepro100 driver (at least) gets upset and
1415 * doesn't work the first time it's opened.
1416 * But then if you close it and reopen it, it
1417 * works just fine. So we need to try that at
1418 * least once before giving up.
1419 *
1420 * Also, if the root will be NFS-mounted, we
1421 * have nowhere to go if DHCP fails. So we
1422 * just have to keep trying forever.
1423 *
1424 * -- Chip
1425 */
1426 #ifdef CONFIG_ROOT_NFS
1427 if (ROOT_DEV == Root_NFS) {
1428 printk(KERN_ERR
1429 "IP-Config: Retrying forever (NFS root)...\n");
1430 goto try_try_again;
1431 }
1432 #endif
1433
1434 if (--retries) {
1435 printk(KERN_ERR
1436 "IP-Config: Reopening network devices...\n");
1437 goto try_try_again;
1438 }
1439
1440 /* Oh, well. At least we tried. */
1441 printk(KERN_ERR "IP-Config: Auto-configuration of network failed.\n");
1442 return -1;
1443 }
1444 #else /* !DYNAMIC */
1445 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
1446 ic_close_devs();
1447 return -1;
1448 #endif /* IPCONFIG_DYNAMIC */
1449 } else {
1450 /* Device selected manually or only one device -> use it */
1451 ic_dev = ic_first_dev->dev;
1452 }
1453
1454 addr = root_nfs_parse_addr(root_server_path);
1455 if (root_server_addr == NONE)
1456 root_server_addr = addr;
1457
1458 /*
1459 * Use defaults wherever applicable.
1460 */
1461 if (ic_defaults() < 0)
1462 return -1;
1463
1464 /*
1465 * Close all network devices except the device we've
1466 * autoconfigured and set up routes.
1467 */
1468 ic_close_devs();
1469 if (ic_setup_if() < 0 || ic_setup_routes() < 0)
1470 return -1;
1471
1472 /*
1473 * Record which protocol was actually used.
1474 */
1475 #ifdef IPCONFIG_DYNAMIC
1476 ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP);
1477 #endif
1478
1479 #ifndef IPCONFIG_SILENT
1480 /*
1481 * Clue in the operator.
1482 */
1483 printk("IP-Config: Complete:\n");
1484 printk(" device=%s", ic_dev->name);
1485 printk(KERN_CONT ", addr=%pI4", &ic_myaddr);
1486 printk(KERN_CONT ", mask=%pI4", &ic_netmask);
1487 printk(KERN_CONT ", gw=%pI4", &ic_gateway);
1488 printk(KERN_CONT ",\n host=%s, domain=%s, nis-domain=%s",
1489 utsname()->nodename, ic_domain, utsname()->domainname);
1490 printk(KERN_CONT ",\n bootserver=%pI4", &ic_servaddr);
1491 printk(KERN_CONT ", rootserver=%pI4", &root_server_addr);
1492 printk(KERN_CONT ", rootpath=%s", root_server_path);
1493 if (ic_dev_mtu)
1494 printk(KERN_CONT ", mtu=%d", ic_dev_mtu);
1495 printk(KERN_CONT "\n");
1496 #endif /* !SILENT */
1497
1498 return 0;
1499 }
1500
1501 late_initcall(ip_auto_config);
1502
1503
1504 /*
1505 * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
1506 * command line parameter. See Documentation/filesystems/nfs/nfsroot.txt.
1507 */
1508 static int __init ic_proto_name(char *name)
1509 {
1510 if (!strcmp(name, "on") || !strcmp(name, "any")) {
1511 return 1;
1512 }
1513 if (!strcmp(name, "off") || !strcmp(name, "none")) {
1514 return 0;
1515 }
1516 #ifdef CONFIG_IP_PNP_DHCP
1517 else if (!strcmp(name, "dhcp")) {
1518 ic_proto_enabled &= ~IC_RARP;
1519 return 1;
1520 }
1521 #endif
1522 #ifdef CONFIG_IP_PNP_BOOTP
1523 else if (!strcmp(name, "bootp")) {
1524 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP);
1525 return 1;
1526 }
1527 #endif
1528 #ifdef CONFIG_IP_PNP_RARP
1529 else if (!strcmp(name, "rarp")) {
1530 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP);
1531 return 1;
1532 }
1533 #endif
1534 #ifdef IPCONFIG_DYNAMIC
1535 else if (!strcmp(name, "both")) {
1536 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */
1537 return 1;
1538 }
1539 #endif
1540 return 0;
1541 }
1542
1543 static int __init ip_auto_config_setup(char *addrs)
1544 {
1545 char *cp, *ip, *dp;
1546 int num = 0;
1547
1548 ic_set_manually = 1;
1549 ic_enable = 1;
1550
1551 /*
1552 * If any dhcp, bootp etc options are set, leave autoconfig on
1553 * and skip the below static IP processing.
1554 */
1555 if (ic_proto_name(addrs))
1556 return 1;
1557
1558 /* If no static IP is given, turn off autoconfig and bail. */
1559 if (*addrs == 0 ||
1560 strcmp(addrs, "off") == 0 ||
1561 strcmp(addrs, "none") == 0) {
1562 ic_enable = 0;
1563 return 1;
1564 }
1565
1566 /* Parse string for static IP assignment. */
1567 ip = addrs;
1568 while (ip && *ip) {
1569 if ((cp = strchr(ip, ':')))
1570 *cp++ = '\0';
1571 if (strlen(ip) > 0) {
1572 DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip));
1573 switch (num) {
1574 case 0:
1575 if ((ic_myaddr = in_aton(ip)) == ANY)
1576 ic_myaddr = NONE;
1577 break;
1578 case 1:
1579 if ((ic_servaddr = in_aton(ip)) == ANY)
1580 ic_servaddr = NONE;
1581 break;
1582 case 2:
1583 if ((ic_gateway = in_aton(ip)) == ANY)
1584 ic_gateway = NONE;
1585 break;
1586 case 3:
1587 if ((ic_netmask = in_aton(ip)) == ANY)
1588 ic_netmask = NONE;
1589 break;
1590 case 4:
1591 if ((dp = strchr(ip, '.'))) {
1592 *dp++ = '\0';
1593 strlcpy(utsname()->domainname, dp,
1594 sizeof(utsname()->domainname));
1595 }
1596 strlcpy(utsname()->nodename, ip,
1597 sizeof(utsname()->nodename));
1598 ic_host_name_set = 1;
1599 break;
1600 case 5:
1601 strlcpy(user_dev_name, ip, sizeof(user_dev_name));
1602 break;
1603 case 6:
1604 if (ic_proto_name(ip) == 0 &&
1605 ic_myaddr == NONE) {
1606 ic_enable = 0;
1607 }
1608 break;
1609 }
1610 }
1611 ip = cp;
1612 num++;
1613 }
1614
1615 return 1;
1616 }
1617
1618 static int __init nfsaddrs_config_setup(char *addrs)
1619 {
1620 return ip_auto_config_setup(addrs);
1621 }
1622
1623 static int __init vendor_class_identifier_setup(char *addrs)
1624 {
1625 if (strlcpy(vendor_class_identifier, addrs,
1626 sizeof(vendor_class_identifier))
1627 >= sizeof(vendor_class_identifier))
1628 printk(KERN_WARNING "DHCP: vendorclass too long, truncated to \"%s\"",
1629 vendor_class_identifier);
1630 return 1;
1631 }
1632
1633 __setup("ip=", ip_auto_config_setup);
1634 __setup("nfsaddrs=", nfsaddrs_config_setup);
1635 __setup("dhcpclass=", vendor_class_identifier_setup);
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