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writeback: split writeback_inodes_wb
[linux-2.6/next.git] / net / ipv4 / ipconfig.c
blobb9d84e800cf4385b9d0bf51fe8aae78989d295b4
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_PRE_OPEN 500 /* Before opening: 1/2 second */
91 #define CONF_POST_OPEN 1 /* After opening: 1 second */
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_device_match(struct net_device *dev)
192 {
193 if (user_dev_name[0] ? !strcmp(dev->name, user_dev_name) :
194 (!(dev->flags & IFF_LOOPBACK) &&
195 (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) &&
196 strncmp(dev->name, "dummy", 5)))
197 return true;
198 return false;
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
207 last = &ic_first_dev;
208 rtnl_lock();
209
210 /* bring loopback device up first */
211 for_each_netdev(&init_net, dev) {
212 if (!(dev->flags & IFF_LOOPBACK))
213 continue;
214 if (dev_change_flags(dev, dev->flags | IFF_UP) < 0)
215 printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name);
216 }
217
218 for_each_netdev(&init_net, dev) {
219 if (dev->flags & IFF_LOOPBACK)
220 continue;
221 if (ic_device_match(dev)) {
222 int able = 0;
223 if (dev->mtu >= 364)
224 able |= IC_BOOTP;
225 else
226 printk(KERN_WARNING "DHCP/BOOTP: Ignoring device %s, MTU %d too small", dev->name, dev->mtu);
227 if (!(dev->flags & IFF_NOARP))
228 able |= IC_RARP;
229 able &= ic_proto_enabled;
230 if (ic_proto_enabled && !able)
231 continue;
232 oflags = dev->flags;
233 if (dev_change_flags(dev, oflags | IFF_UP) < 0) {
234 printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name);
235 continue;
236 }
237 if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) {
238 rtnl_unlock();
239 return -ENOMEM;
240 }
241 d->dev = dev;
242 *last = d;
243 last = &d->next;
244 d->flags = oflags;
245 d->able = able;
246 if (able & IC_BOOTP)
247 get_random_bytes(&d->xid, sizeof(__be32));
248 else
249 d->xid = 0;
250 ic_proto_have_if |= able;
251 DBG(("IP-Config: %s UP (able=%d, xid=%08x)\n",
252 dev->name, able, d->xid));
253 }
254 }
255 rtnl_unlock();
256
257 *last = NULL;
258
259 if (!ic_first_dev) {
260 if (user_dev_name[0])
261 printk(KERN_ERR "IP-Config: Device `%s' not found.\n", user_dev_name);
262 else
263 printk(KERN_ERR "IP-Config: No network devices available.\n");
264 return -ENODEV;
265 }
266 return 0;
267 }
268
269 static void __init ic_close_devs(void)
270 {
271 struct ic_device *d, *next;
272 struct net_device *dev;
273
274 rtnl_lock();
275 next = ic_first_dev;
276 while ((d = next)) {
277 next = d->next;
278 dev = d->dev;
279 if (dev != ic_dev) {
280 DBG(("IP-Config: Downing %s\n", dev->name));
281 dev_change_flags(dev, d->flags);
282 }
283 kfree(d);
284 }
285 rtnl_unlock();
286 }
287
288 /*
289 * Interface to various network functions.
290 */
291
292 static inline void
293 set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port)
294 {
295 sin->sin_family = AF_INET;
296 sin->sin_addr.s_addr = addr;
297 sin->sin_port = port;
298 }
299
300 static int __init ic_devinet_ioctl(unsigned int cmd, struct ifreq *arg)
301 {
302 int res;
303
304 mm_segment_t oldfs = get_fs();
305 set_fs(get_ds());
306 res = devinet_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
307 set_fs(oldfs);
308 return res;
309 }
310
311 static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg)
312 {
313 int res;
314
315 mm_segment_t oldfs = get_fs();
316 set_fs(get_ds());
317 res = dev_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
318 set_fs(oldfs);
319 return res;
320 }
321
322 static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg)
323 {
324 int res;
325
326 mm_segment_t oldfs = get_fs();
327 set_fs(get_ds());
328 res = ip_rt_ioctl(&init_net, cmd, (void __user *) arg);
329 set_fs(oldfs);
330 return res;
331 }
332
333 /*
334 * Set up interface addresses and routes.
335 */
336
337 static int __init ic_setup_if(void)
338 {
339 struct ifreq ir;
340 struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr;
341 int err;
342
343 memset(&ir, 0, sizeof(ir));
344 strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name);
345 set_sockaddr(sin, ic_myaddr, 0);
346 if ((err = ic_devinet_ioctl(SIOCSIFADDR, &ir)) < 0) {
347 printk(KERN_ERR "IP-Config: Unable to set interface address (%d).\n", err);
348 return -1;
349 }
350 set_sockaddr(sin, ic_netmask, 0);
351 if ((err = ic_devinet_ioctl(SIOCSIFNETMASK, &ir)) < 0) {
352 printk(KERN_ERR "IP-Config: Unable to set interface netmask (%d).\n", err);
353 return -1;
354 }
355 set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0);
356 if ((err = ic_devinet_ioctl(SIOCSIFBRDADDR, &ir)) < 0) {
357 printk(KERN_ERR "IP-Config: Unable to set interface broadcast address (%d).\n", err);
358 return -1;
359 }
360 /* Handle the case where we need non-standard MTU on the boot link (a network
361 * using jumbo frames, for instance). If we can't set the mtu, don't error
362 * out, we'll try to muddle along.
363 */
364 if (ic_dev_mtu != 0) {
365 strcpy(ir.ifr_name, ic_dev->name);
366 ir.ifr_mtu = ic_dev_mtu;
367 if ((err = ic_dev_ioctl(SIOCSIFMTU, &ir)) < 0)
368 printk(KERN_ERR "IP-Config: Unable to set interface mtu to %d (%d).\n",
369 ic_dev_mtu, err);
370 }
371 return 0;
372 }
373
374 static int __init ic_setup_routes(void)
375 {
376 /* No need to setup device routes, only the default route... */
377
378 if (ic_gateway != NONE) {
379 struct rtentry rm;
380 int err;
381
382 memset(&rm, 0, sizeof(rm));
383 if ((ic_gateway ^ ic_myaddr) & ic_netmask) {
384 printk(KERN_ERR "IP-Config: Gateway not on directly connected network.\n");
385 return -1;
386 }
387 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0);
388 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0);
389 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0);
390 rm.rt_flags = RTF_UP | RTF_GATEWAY;
391 if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) {
392 printk(KERN_ERR "IP-Config: Cannot add default route (%d).\n", err);
393 return -1;
394 }
395 }
396
397 return 0;
398 }
399
400 /*
401 * Fill in default values for all missing parameters.
402 */
403
404 static int __init ic_defaults(void)
405 {
406 /*
407 * At this point we have no userspace running so need not
408 * claim locks on system_utsname
409 */
410
411 if (!ic_host_name_set)
412 sprintf(init_utsname()->nodename, "%pI4", &ic_myaddr);
413
414 if (root_server_addr == NONE)
415 root_server_addr = ic_servaddr;
416
417 if (ic_netmask == NONE) {
418 if (IN_CLASSA(ntohl(ic_myaddr)))
419 ic_netmask = htonl(IN_CLASSA_NET);
420 else if (IN_CLASSB(ntohl(ic_myaddr)))
421 ic_netmask = htonl(IN_CLASSB_NET);
422 else if (IN_CLASSC(ntohl(ic_myaddr)))
423 ic_netmask = htonl(IN_CLASSC_NET);
424 else {
425 printk(KERN_ERR "IP-Config: Unable to guess netmask for address %pI4\n",
426 &ic_myaddr);
427 return -1;
428 }
429 printk("IP-Config: Guessing netmask %pI4\n", &ic_netmask);
430 }
431
432 return 0;
433 }
434
435 /*
436 * RARP support.
437 */
438
439 #ifdef IPCONFIG_RARP
440
441 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
442
443 static struct packet_type rarp_packet_type __initdata = {
444 .type = cpu_to_be16(ETH_P_RARP),
445 .func = ic_rarp_recv,
446 };
447
448 static inline void __init ic_rarp_init(void)
449 {
450 dev_add_pack(&rarp_packet_type);
451 }
452
453 static inline void __init ic_rarp_cleanup(void)
454 {
455 dev_remove_pack(&rarp_packet_type);
456 }
457
458 /*
459 * Process received RARP packet.
460 */
461 static int __init
462 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
463 {
464 struct arphdr *rarp;
465 unsigned char *rarp_ptr;
466 __be32 sip, tip;
467 unsigned char *sha, *tha; /* s for "source", t for "target" */
468 struct ic_device *d;
469
470 if (!net_eq(dev_net(dev), &init_net))
471 goto drop;
472
473 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
474 return NET_RX_DROP;
475
476 if (!pskb_may_pull(skb, sizeof(struct arphdr)))
477 goto drop;
478
479 /* Basic sanity checks can be done without the lock. */
480 rarp = (struct arphdr *)skb_transport_header(skb);
481
482 /* If this test doesn't pass, it's not IP, or we should
483 * ignore it anyway.
484 */
485 if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd))
486 goto drop;
487
488 /* If it's not a RARP reply, delete it. */
489 if (rarp->ar_op != htons(ARPOP_RREPLY))
490 goto drop;
491
492 /* If it's not Ethernet, delete it. */
493 if (rarp->ar_pro != htons(ETH_P_IP))
494 goto drop;
495
496 if (!pskb_may_pull(skb, arp_hdr_len(dev)))
497 goto drop;
498
499 /* OK, it is all there and looks valid, process... */
500 rarp = (struct arphdr *)skb_transport_header(skb);
501 rarp_ptr = (unsigned char *) (rarp + 1);
502
503 /* One reply at a time, please. */
504 spin_lock(&ic_recv_lock);
505
506 /* If we already have a reply, just drop the packet */
507 if (ic_got_reply)
508 goto drop_unlock;
509
510 /* Find the ic_device that the packet arrived on */
511 d = ic_first_dev;
512 while (d && d->dev != dev)
513 d = d->next;
514 if (!d)
515 goto drop_unlock; /* should never happen */
516
517 /* Extract variable-width fields */
518 sha = rarp_ptr;
519 rarp_ptr += dev->addr_len;
520 memcpy(&sip, rarp_ptr, 4);
521 rarp_ptr += 4;
522 tha = rarp_ptr;
523 rarp_ptr += dev->addr_len;
524 memcpy(&tip, rarp_ptr, 4);
525
526 /* Discard packets which are not meant for us. */
527 if (memcmp(tha, dev->dev_addr, dev->addr_len))
528 goto drop_unlock;
529
530 /* Discard packets which are not from specified server. */
531 if (ic_servaddr != NONE && ic_servaddr != sip)
532 goto drop_unlock;
533
534 /* We have a winner! */
535 ic_dev = dev;
536 if (ic_myaddr == NONE)
537 ic_myaddr = tip;
538 ic_servaddr = sip;
539 ic_got_reply = IC_RARP;
540
541 drop_unlock:
542 /* Show's over. Nothing to see here. */
543 spin_unlock(&ic_recv_lock);
544
545 drop:
546 /* Throw the packet out. */
547 kfree_skb(skb);
548 return 0;
549 }
550
551
552 /*
553 * Send RARP request packet over a single interface.
554 */
555 static void __init ic_rarp_send_if(struct ic_device *d)
556 {
557 struct net_device *dev = d->dev;
558 arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL,
559 dev->dev_addr, dev->dev_addr);
560 }
561 #endif
562
563 /*
564 * DHCP/BOOTP support.
565 */
566
567 #ifdef IPCONFIG_BOOTP
568
569 struct bootp_pkt { /* BOOTP packet format */
570 struct iphdr iph; /* IP header */
571 struct udphdr udph; /* UDP header */
572 u8 op; /* 1=request, 2=reply */
573 u8 htype; /* HW address type */
574 u8 hlen; /* HW address length */
575 u8 hops; /* Used only by gateways */
576 __be32 xid; /* Transaction ID */
577 __be16 secs; /* Seconds since we started */
578 __be16 flags; /* Just what it says */
579 __be32 client_ip; /* Client's IP address if known */
580 __be32 your_ip; /* Assigned IP address */
581 __be32 server_ip; /* (Next, e.g. NFS) Server's IP address */
582 __be32 relay_ip; /* IP address of BOOTP relay */
583 u8 hw_addr[16]; /* Client's HW address */
584 u8 serv_name[64]; /* Server host name */
585 u8 boot_file[128]; /* Name of boot file */
586 u8 exten[312]; /* DHCP options / BOOTP vendor extensions */
587 };
588
589 /* packet ops */
590 #define BOOTP_REQUEST 1
591 #define BOOTP_REPLY 2
592
593 /* DHCP message types */
594 #define DHCPDISCOVER 1
595 #define DHCPOFFER 2
596 #define DHCPREQUEST 3
597 #define DHCPDECLINE 4
598 #define DHCPACK 5
599 #define DHCPNAK 6
600 #define DHCPRELEASE 7
601 #define DHCPINFORM 8
602
603 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
604
605 static struct packet_type bootp_packet_type __initdata = {
606 .type = cpu_to_be16(ETH_P_IP),
607 .func = ic_bootp_recv,
608 };
609
610
611 /*
612 * Initialize DHCP/BOOTP extension fields in the request.
613 */
614
615 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 };
616
617 #ifdef IPCONFIG_DHCP
618
619 static void __init
620 ic_dhcp_init_options(u8 *options)
621 {
622 u8 mt = ((ic_servaddr == NONE)
623 ? DHCPDISCOVER : DHCPREQUEST);
624 u8 *e = options;
625 int len;
626
627 #ifdef IPCONFIG_DEBUG
628 printk("DHCP: Sending message type %d\n", mt);
629 #endif
630
631 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */
632 e += 4;
633
634 *e++ = 53; /* DHCP message type */
635 *e++ = 1;
636 *e++ = mt;
637
638 if (mt == DHCPREQUEST) {
639 *e++ = 54; /* Server ID (IP address) */
640 *e++ = 4;
641 memcpy(e, &ic_servaddr, 4);
642 e += 4;
643
644 *e++ = 50; /* Requested IP address */
645 *e++ = 4;
646 memcpy(e, &ic_myaddr, 4);
647 e += 4;
648 }
649
650 /* always? */
651 {
652 static const u8 ic_req_params[] = {
653 1, /* Subnet mask */
654 3, /* Default gateway */
655 6, /* DNS server */
656 12, /* Host name */
657 15, /* Domain name */
658 17, /* Boot path */
659 26, /* MTU */
660 40, /* NIS domain name */
661 };
662
663 *e++ = 55; /* Parameter request list */
664 *e++ = sizeof(ic_req_params);
665 memcpy(e, ic_req_params, sizeof(ic_req_params));
666 e += sizeof(ic_req_params);
667
668 if (*vendor_class_identifier) {
669 printk(KERN_INFO "DHCP: sending class identifier \"%s\"\n",
670 vendor_class_identifier);
671 *e++ = 60; /* Class-identifier */
672 len = strlen(vendor_class_identifier);
673 *e++ = len;
674 memcpy(e, vendor_class_identifier, len);
675 e += len;
676 }
677 }
678
679 *e++ = 255; /* End of the list */
680 }
681
682 #endif /* IPCONFIG_DHCP */
683
684 static void __init ic_bootp_init_ext(u8 *e)
685 {
686 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */
687 e += 4;
688 *e++ = 1; /* Subnet mask request */
689 *e++ = 4;
690 e += 4;
691 *e++ = 3; /* Default gateway request */
692 *e++ = 4;
693 e += 4;
694 *e++ = 5; /* Name server request */
695 *e++ = 8;
696 e += 8;
697 *e++ = 12; /* Host name request */
698 *e++ = 32;
699 e += 32;
700 *e++ = 40; /* NIS Domain name request */
701 *e++ = 32;
702 e += 32;
703 *e++ = 17; /* Boot path */
704 *e++ = 40;
705 e += 40;
706
707 *e++ = 57; /* set extension buffer size for reply */
708 *e++ = 2;
709 *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */
710 *e++ = 150;
711
712 *e++ = 255; /* End of the list */
713 }
714
715
716 /*
717 * Initialize the DHCP/BOOTP mechanism.
718 */
719 static inline void __init ic_bootp_init(void)
720 {
721 int i;
722
723 for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
724 ic_nameservers[i] = NONE;
725
726 dev_add_pack(&bootp_packet_type);
727 }
728
729
730 /*
731 * DHCP/BOOTP cleanup.
732 */
733 static inline void __init ic_bootp_cleanup(void)
734 {
735 dev_remove_pack(&bootp_packet_type);
736 }
737
738
739 /*
740 * Send DHCP/BOOTP request to single interface.
741 */
742 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff)
743 {
744 struct net_device *dev = d->dev;
745 struct sk_buff *skb;
746 struct bootp_pkt *b;
747 struct iphdr *h;
748
749 /* Allocate packet */
750 skb = alloc_skb(sizeof(struct bootp_pkt) + LL_ALLOCATED_SPACE(dev) + 15,
751 GFP_KERNEL);
752 if (!skb)
753 return;
754 skb_reserve(skb, LL_RESERVED_SPACE(dev));
755 b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt));
756 memset(b, 0, sizeof(struct bootp_pkt));
757
758 /* Construct IP header */
759 skb_reset_network_header(skb);
760 h = ip_hdr(skb);
761 h->version = 4;
762 h->ihl = 5;
763 h->tot_len = htons(sizeof(struct bootp_pkt));
764 h->frag_off = htons(IP_DF);
765 h->ttl = 64;
766 h->protocol = IPPROTO_UDP;
767 h->daddr = htonl(INADDR_BROADCAST);
768 h->check = ip_fast_csum((unsigned char *) h, h->ihl);
769
770 /* Construct UDP header */
771 b->udph.source = htons(68);
772 b->udph.dest = htons(67);
773 b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr));
774 /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */
775
776 /* Construct DHCP/BOOTP header */
777 b->op = BOOTP_REQUEST;
778 if (dev->type < 256) /* check for false types */
779 b->htype = dev->type;
780 else if (dev->type == ARPHRD_IEEE802_TR) /* fix for token ring */
781 b->htype = ARPHRD_IEEE802;
782 else if (dev->type == ARPHRD_FDDI)
783 b->htype = ARPHRD_ETHER;
784 else {
785 printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name);
786 b->htype = dev->type; /* can cause undefined behavior */
787 }
788
789 /* server_ip and your_ip address are both already zero per RFC2131 */
790 b->hlen = dev->addr_len;
791 memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
792 b->secs = htons(jiffies_diff / HZ);
793 b->xid = d->xid;
794
795 /* add DHCP options or BOOTP extensions */
796 #ifdef IPCONFIG_DHCP
797 if (ic_proto_enabled & IC_USE_DHCP)
798 ic_dhcp_init_options(b->exten);
799 else
800 #endif
801 ic_bootp_init_ext(b->exten);
802
803 /* Chain packet down the line... */
804 skb->dev = dev;
805 skb->protocol = htons(ETH_P_IP);
806 if (dev_hard_header(skb, dev, ntohs(skb->protocol),
807 dev->broadcast, dev->dev_addr, skb->len) < 0 ||
808 dev_queue_xmit(skb) < 0)
809 printk("E");
810 }
811
812
813 /*
814 * Copy BOOTP-supplied string if not already set.
815 */
816 static int __init ic_bootp_string(char *dest, char *src, int len, int max)
817 {
818 if (!len)
819 return 0;
820 if (len > max-1)
821 len = max-1;
822 memcpy(dest, src, len);
823 dest[len] = '\0';
824 return 1;
825 }
826
827
828 /*
829 * Process BOOTP extensions.
830 */
831 static void __init ic_do_bootp_ext(u8 *ext)
832 {
833 u8 servers;
834 int i;
835 u16 mtu;
836
837 #ifdef IPCONFIG_DEBUG
838 u8 *c;
839
840 printk("DHCP/BOOTP: Got extension %d:",*ext);
841 for (c=ext+2; c<ext+2+ext[1]; c++)
842 printk(" %02x", *c);
843 printk("\n");
844 #endif
845
846 switch (*ext++) {
847 case 1: /* Subnet mask */
848 if (ic_netmask == NONE)
849 memcpy(&ic_netmask, ext+1, 4);
850 break;
851 case 3: /* Default gateway */
852 if (ic_gateway == NONE)
853 memcpy(&ic_gateway, ext+1, 4);
854 break;
855 case 6: /* DNS server */
856 servers= *ext/4;
857 if (servers > CONF_NAMESERVERS_MAX)
858 servers = CONF_NAMESERVERS_MAX;
859 for (i = 0; i < servers; i++) {
860 if (ic_nameservers[i] == NONE)
861 memcpy(&ic_nameservers[i], ext+1+4*i, 4);
862 }
863 break;
864 case 12: /* Host name */
865 ic_bootp_string(utsname()->nodename, ext+1, *ext, __NEW_UTS_LEN);
866 ic_host_name_set = 1;
867 break;
868 case 15: /* Domain name (DNS) */
869 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
870 break;
871 case 17: /* Root path */
872 if (!root_server_path[0])
873 ic_bootp_string(root_server_path, ext+1, *ext, sizeof(root_server_path));
874 break;
875 case 26: /* Interface MTU */
876 memcpy(&mtu, ext+1, sizeof(mtu));
877 ic_dev_mtu = ntohs(mtu);
878 break;
879 case 40: /* NIS Domain name (_not_ DNS) */
880 ic_bootp_string(utsname()->domainname, ext+1, *ext, __NEW_UTS_LEN);
881 break;
882 }
883 }
884
885
886 /*
887 * Receive BOOTP reply.
888 */
889 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
890 {
891 struct bootp_pkt *b;
892 struct iphdr *h;
893 struct ic_device *d;
894 int len, ext_len;
895
896 if (!net_eq(dev_net(dev), &init_net))
897 goto drop;
898
899 /* Perform verifications before taking the lock. */
900 if (skb->pkt_type == PACKET_OTHERHOST)
901 goto drop;
902
903 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
904 return NET_RX_DROP;
905
906 if (!pskb_may_pull(skb,
907 sizeof(struct iphdr) +
908 sizeof(struct udphdr)))
909 goto drop;
910
911 b = (struct bootp_pkt *)skb_network_header(skb);
912 h = &b->iph;
913
914 if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP)
915 goto drop;
916
917 /* Fragments are not supported */
918 if (h->frag_off & htons(IP_OFFSET | IP_MF)) {
919 if (net_ratelimit())
920 printk(KERN_ERR "DHCP/BOOTP: Ignoring fragmented "
921 "reply.\n");
922 goto drop;
923 }
924
925 if (skb->len < ntohs(h->tot_len))
926 goto drop;
927
928 if (ip_fast_csum((char *) h, h->ihl))
929 goto drop;
930
931 if (b->udph.source != htons(67) || b->udph.dest != htons(68))
932 goto drop;
933
934 if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
935 goto drop;
936
937 len = ntohs(b->udph.len) - sizeof(struct udphdr);
938 ext_len = len - (sizeof(*b) -
939 sizeof(struct iphdr) -
940 sizeof(struct udphdr) -
941 sizeof(b->exten));
942 if (ext_len < 0)
943 goto drop;
944
945 /* Ok the front looks good, make sure we can get at the rest. */
946 if (!pskb_may_pull(skb, skb->len))
947 goto drop;
948
949 b = (struct bootp_pkt *)skb_network_header(skb);
950 h = &b->iph;
951
952 /* One reply at a time, please. */
953 spin_lock(&ic_recv_lock);
954
955 /* If we already have a reply, just drop the packet */
956 if (ic_got_reply)
957 goto drop_unlock;
958
959 /* Find the ic_device that the packet arrived on */
960 d = ic_first_dev;
961 while (d && d->dev != dev)
962 d = d->next;
963 if (!d)
964 goto drop_unlock; /* should never happen */
965
966 /* Is it a reply to our BOOTP request? */
967 if (b->op != BOOTP_REPLY ||
968 b->xid != d->xid) {
969 if (net_ratelimit())
970 printk(KERN_ERR "DHCP/BOOTP: Reply not for us, "
971 "op[%x] xid[%x]\n",
972 b->op, b->xid);
973 goto drop_unlock;
974 }
975
976 /* Is it a reply for the device we are configuring? */
977 if (b->xid != ic_dev_xid) {
978 if (net_ratelimit())
979 printk(KERN_ERR "DHCP/BOOTP: Ignoring delayed packet\n");
980 goto drop_unlock;
981 }
982
983 /* Parse extensions */
984 if (ext_len >= 4 &&
985 !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */
986 u8 *end = (u8 *) b + ntohs(b->iph.tot_len);
987 u8 *ext;
988
989 #ifdef IPCONFIG_DHCP
990 if (ic_proto_enabled & IC_USE_DHCP) {
991 __be32 server_id = NONE;
992 int mt = 0;
993
994 ext = &b->exten[4];
995 while (ext < end && *ext != 0xff) {
996 u8 *opt = ext++;
997 if (*opt == 0) /* Padding */
998 continue;
999 ext += *ext + 1;
1000 if (ext >= end)
1001 break;
1002 switch (*opt) {
1003 case 53: /* Message type */
1004 if (opt[1])
1005 mt = opt[2];
1006 break;
1007 case 54: /* Server ID (IP address) */
1008 if (opt[1] >= 4)
1009 memcpy(&server_id, opt + 2, 4);
1010 break;
1011 }
1012 }
1013
1014 #ifdef IPCONFIG_DEBUG
1015 printk("DHCP: Got message type %d\n", mt);
1016 #endif
1017
1018 switch (mt) {
1019 case DHCPOFFER:
1020 /* While in the process of accepting one offer,
1021 * ignore all others.
1022 */
1023 if (ic_myaddr != NONE)
1024 goto drop_unlock;
1025
1026 /* Let's accept that offer. */
1027 ic_myaddr = b->your_ip;
1028 ic_servaddr = server_id;
1029 #ifdef IPCONFIG_DEBUG
1030 printk("DHCP: Offered address %pI4 by server %pI4\n",
1031 &ic_myaddr, &ic_servaddr);
1032 #endif
1033 /* The DHCP indicated server address takes
1034 * precedence over the bootp header one if
1035 * they are different.
1036 */
1037 if ((server_id != NONE) &&
1038 (b->server_ip != server_id))
1039 b->server_ip = ic_servaddr;
1040 break;
1041
1042 case DHCPACK:
1043 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0)
1044 goto drop_unlock;
1045
1046 /* Yeah! */
1047 break;
1048
1049 default:
1050 /* Urque. Forget it*/
1051 ic_myaddr = NONE;
1052 ic_servaddr = NONE;
1053 goto drop_unlock;
1054 }
1055
1056 ic_dhcp_msgtype = mt;
1057
1058 }
1059 #endif /* IPCONFIG_DHCP */
1060
1061 ext = &b->exten[4];
1062 while (ext < end && *ext != 0xff) {
1063 u8 *opt = ext++;
1064 if (*opt == 0) /* Padding */
1065 continue;
1066 ext += *ext + 1;
1067 if (ext < end)
1068 ic_do_bootp_ext(opt);
1069 }
1070 }
1071
1072 /* We have a winner! */
1073 ic_dev = dev;
1074 ic_myaddr = b->your_ip;
1075 ic_servaddr = b->server_ip;
1076 if (ic_gateway == NONE && b->relay_ip)
1077 ic_gateway = b->relay_ip;
1078 if (ic_nameservers[0] == NONE)
1079 ic_nameservers[0] = ic_servaddr;
1080 ic_got_reply = IC_BOOTP;
1081
1082 drop_unlock:
1083 /* Show's over. Nothing to see here. */
1084 spin_unlock(&ic_recv_lock);
1085
1086 drop:
1087 /* Throw the packet out. */
1088 kfree_skb(skb);
1089
1090 return 0;
1091 }
1092
1093
1094 #endif
1095
1096
1097 /*
1098 * Dynamic IP configuration -- DHCP, BOOTP, RARP.
1099 */
1100
1101 #ifdef IPCONFIG_DYNAMIC
1102
1103 static int __init ic_dynamic(void)
1104 {
1105 int retries;
1106 struct ic_device *d;
1107 unsigned long start_jiffies, timeout, jiff;
1108 int do_bootp = ic_proto_have_if & IC_BOOTP;
1109 int do_rarp = ic_proto_have_if & IC_RARP;
1110
1111 /*
1112 * If none of DHCP/BOOTP/RARP was selected, return with an error.
1113 * This routine gets only called when some pieces of information
1114 * are missing, and without DHCP/BOOTP/RARP we are unable to get it.
1115 */
1116 if (!ic_proto_enabled) {
1117 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
1118 return -1;
1119 }
1120
1121 #ifdef IPCONFIG_BOOTP
1122 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
1123 printk(KERN_ERR "DHCP/BOOTP: No suitable device found.\n");
1124 #endif
1125 #ifdef IPCONFIG_RARP
1126 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)
1127 printk(KERN_ERR "RARP: No suitable device found.\n");
1128 #endif
1129
1130 if (!ic_proto_have_if)
1131 /* Error message already printed */
1132 return -1;
1133
1134 /*
1135 * Setup protocols
1136 */
1137 #ifdef IPCONFIG_BOOTP
1138 if (do_bootp)
1139 ic_bootp_init();
1140 #endif
1141 #ifdef IPCONFIG_RARP
1142 if (do_rarp)
1143 ic_rarp_init();
1144 #endif
1145
1146 /*
1147 * Send requests and wait, until we get an answer. This loop
1148 * seems to be a terrible waste of CPU time, but actually there is
1149 * only one process running at all, so we don't need to use any
1150 * scheduler functions.
1151 * [Actually we could now, but the nothing else running note still
1152 * applies.. - AC]
1153 */
1154 printk(KERN_NOTICE "Sending %s%s%s requests .",
1155 do_bootp
1156 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "",
1157 (do_bootp && do_rarp) ? " and " : "",
1158 do_rarp ? "RARP" : "");
1159
1160 start_jiffies = jiffies;
1161 d = ic_first_dev;
1162 retries = CONF_SEND_RETRIES;
1163 get_random_bytes(&timeout, sizeof(timeout));
1164 timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned) CONF_TIMEOUT_RANDOM);
1165 for (;;) {
1166 /* Track the device we are configuring */
1167 ic_dev_xid = d->xid;
1168
1169 #ifdef IPCONFIG_BOOTP
1170 if (do_bootp && (d->able & IC_BOOTP))
1171 ic_bootp_send_if(d, jiffies - start_jiffies);
1172 #endif
1173 #ifdef IPCONFIG_RARP
1174 if (do_rarp && (d->able & IC_RARP))
1175 ic_rarp_send_if(d);
1176 #endif
1177
1178 jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout);
1179 while (time_before(jiffies, jiff) && !ic_got_reply)
1180 schedule_timeout_uninterruptible(1);
1181 #ifdef IPCONFIG_DHCP
1182 /* DHCP isn't done until we get a DHCPACK. */
1183 if ((ic_got_reply & IC_BOOTP) &&
1184 (ic_proto_enabled & IC_USE_DHCP) &&
1185 ic_dhcp_msgtype != DHCPACK) {
1186 ic_got_reply = 0;
1187 printk(",");
1188 continue;
1189 }
1190 #endif /* IPCONFIG_DHCP */
1191
1192 if (ic_got_reply) {
1193 printk(" OK\n");
1194 break;
1195 }
1196
1197 if ((d = d->next))
1198 continue;
1199
1200 if (! --retries) {
1201 printk(" timed out!\n");
1202 break;
1203 }
1204
1205 d = ic_first_dev;
1206
1207 timeout = timeout CONF_TIMEOUT_MULT;
1208 if (timeout > CONF_TIMEOUT_MAX)
1209 timeout = CONF_TIMEOUT_MAX;
1210
1211 printk(".");
1212 }
1213
1214 #ifdef IPCONFIG_BOOTP
1215 if (do_bootp)
1216 ic_bootp_cleanup();
1217 #endif
1218 #ifdef IPCONFIG_RARP
1219 if (do_rarp)
1220 ic_rarp_cleanup();
1221 #endif
1222
1223 if (!ic_got_reply) {
1224 ic_myaddr = NONE;
1225 return -1;
1226 }
1227
1228 printk("IP-Config: Got %s answer from %pI4, ",
1229 ((ic_got_reply & IC_RARP) ? "RARP"
1230 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),
1231 &ic_servaddr);
1232 printk("my address is %pI4\n", &ic_myaddr);
1233
1234 return 0;
1235 }
1236
1237 #endif /* IPCONFIG_DYNAMIC */
1238
1239 #ifdef CONFIG_PROC_FS
1240
1241 static int pnp_seq_show(struct seq_file *seq, void *v)
1242 {
1243 int i;
1244
1245 if (ic_proto_used & IC_PROTO)
1246 seq_printf(seq, "#PROTO: %s\n",
1247 (ic_proto_used & IC_RARP) ? "RARP"
1248 : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP");
1249 else
1250 seq_puts(seq, "#MANUAL\n");
1251
1252 if (ic_domain[0])
1253 seq_printf(seq,
1254 "domain %s\n", ic_domain);
1255 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {
1256 if (ic_nameservers[i] != NONE)
1257 seq_printf(seq, "nameserver %pI4\n",
1258 &ic_nameservers[i]);
1259 }
1260 if (ic_servaddr != NONE)
1261 seq_printf(seq, "bootserver %pI4\n",
1262 &ic_servaddr);
1263 return 0;
1264 }
1265
1266 static int pnp_seq_open(struct inode *indoe, struct file *file)
1267 {
1268 return single_open(file, pnp_seq_show, NULL);
1269 }
1270
1271 static const struct file_operations pnp_seq_fops = {
1272 .owner = THIS_MODULE,
1273 .open = pnp_seq_open,
1274 .read = seq_read,
1275 .llseek = seq_lseek,
1276 .release = single_release,
1277 };
1278 #endif /* CONFIG_PROC_FS */
1279
1280 /*
1281 * Extract IP address from the parameter string if needed. Note that we
1282 * need to have root_server_addr set _before_ IPConfig gets called as it
1283 * can override it.
1284 */
1285 __be32 __init root_nfs_parse_addr(char *name)
1286 {
1287 __be32 addr;
1288 int octets = 0;
1289 char *cp, *cq;
1290
1291 cp = cq = name;
1292 while (octets < 4) {
1293 while (*cp >= '0' && *cp <= '9')
1294 cp++;
1295 if (cp == cq || cp - cq > 3)
1296 break;
1297 if (*cp == '.' || octets == 3)
1298 octets++;
1299 if (octets < 4)
1300 cp++;
1301 cq = cp;
1302 }
1303 if (octets == 4 && (*cp == ':' || *cp == '\0')) {
1304 if (*cp == ':')
1305 *cp++ = '\0';
1306 addr = in_aton(name);
1307 memmove(name, cp, strlen(cp) + 1);
1308 } else
1309 addr = NONE;
1310
1311 return addr;
1312 }
1313
1314 #define DEVICE_WAIT_MAX 12 /* 12 seconds */
1315
1316 static int __init wait_for_devices(void)
1317 {
1318 int i;
1319
1320 msleep(CONF_PRE_OPEN);
1321 for (i = 0; i < DEVICE_WAIT_MAX; i++) {
1322 struct net_device *dev;
1323 int found = 0;
1324
1325 rtnl_lock();
1326 for_each_netdev(&init_net, dev) {
1327 if (ic_device_match(dev)) {
1328 found = 1;
1329 break;
1330 }
1331 }
1332 rtnl_unlock();
1333 if (found)
1334 return 0;
1335 ssleep(1);
1336 }
1337 return -ENODEV;
1338 }
1339
1340 /*
1341 * IP Autoconfig dispatcher.
1342 */
1343
1344 static int __init ip_auto_config(void)
1345 {
1346 __be32 addr;
1347 #ifdef IPCONFIG_DYNAMIC
1348 int retries = CONF_OPEN_RETRIES;
1349 #endif
1350 int err;
1351
1352 #ifdef CONFIG_PROC_FS
1353 proc_net_fops_create(&init_net, "pnp", S_IRUGO, &pnp_seq_fops);
1354 #endif /* CONFIG_PROC_FS */
1355
1356 if (!ic_enable)
1357 return 0;
1358
1359 DBG(("IP-Config: Entered.\n"));
1360 #ifdef IPCONFIG_DYNAMIC
1361 try_try_again:
1362 #endif
1363 /* Wait for devices to appear */
1364 err = wait_for_devices();
1365 if (err)
1366 return err;
1367
1368 /* Setup all network devices */
1369 err = ic_open_devs();
1370 if (err)
1371 return err;
1372
1373 /* Give drivers a chance to settle */
1374 ssleep(CONF_POST_OPEN);
1375
1376 /*
1377 * If the config information is insufficient (e.g., our IP address or
1378 * IP address of the boot server is missing or we have multiple network
1379 * interfaces and no default was set), use BOOTP or RARP to get the
1380 * missing values.
1381 */
1382 if (ic_myaddr == NONE ||
1383 #ifdef CONFIG_ROOT_NFS
1384 (root_server_addr == NONE &&
1385 ic_servaddr == NONE &&
1386 ROOT_DEV == Root_NFS) ||
1387 #endif
1388 ic_first_dev->next) {
1389 #ifdef IPCONFIG_DYNAMIC
1390 if (ic_dynamic() < 0) {
1391 ic_close_devs();
1392
1393 /*
1394 * I don't know why, but sometimes the
1395 * eepro100 driver (at least) gets upset and
1396 * doesn't work the first time it's opened.
1397 * But then if you close it and reopen it, it
1398 * works just fine. So we need to try that at
1399 * least once before giving up.
1400 *
1401 * Also, if the root will be NFS-mounted, we
1402 * have nowhere to go if DHCP fails. So we
1403 * just have to keep trying forever.
1404 *
1405 * -- Chip
1406 */
1407 #ifdef CONFIG_ROOT_NFS
1408 if (ROOT_DEV == Root_NFS) {
1409 printk(KERN_ERR
1410 "IP-Config: Retrying forever (NFS root)...\n");
1411 goto try_try_again;
1412 }
1413 #endif
1414
1415 if (--retries) {
1416 printk(KERN_ERR
1417 "IP-Config: Reopening network devices...\n");
1418 goto try_try_again;
1419 }
1420
1421 /* Oh, well. At least we tried. */
1422 printk(KERN_ERR "IP-Config: Auto-configuration of network failed.\n");
1423 return -1;
1424 }
1425 #else /* !DYNAMIC */
1426 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
1427 ic_close_devs();
1428 return -1;
1429 #endif /* IPCONFIG_DYNAMIC */
1430 } else {
1431 /* Device selected manually or only one device -> use it */
1432 ic_dev = ic_first_dev->dev;
1433 }
1434
1435 addr = root_nfs_parse_addr(root_server_path);
1436 if (root_server_addr == NONE)
1437 root_server_addr = addr;
1438
1439 /*
1440 * Use defaults whereever applicable.
1441 */
1442 if (ic_defaults() < 0)
1443 return -1;
1444
1445 /*
1446 * Close all network devices except the device we've
1447 * autoconfigured and set up routes.
1448 */
1449 ic_close_devs();
1450 if (ic_setup_if() < 0 || ic_setup_routes() < 0)
1451 return -1;
1452
1453 /*
1454 * Record which protocol was actually used.
1455 */
1456 #ifdef IPCONFIG_DYNAMIC
1457 ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP);
1458 #endif
1459
1460 #ifndef IPCONFIG_SILENT
1461 /*
1462 * Clue in the operator.
1463 */
1464 printk("IP-Config: Complete:");
1465 printk("\n device=%s", ic_dev->name);
1466 printk(", addr=%pI4", &ic_myaddr);
1467 printk(", mask=%pI4", &ic_netmask);
1468 printk(", gw=%pI4", &ic_gateway);
1469 printk(",\n host=%s, domain=%s, nis-domain=%s",
1470 utsname()->nodename, ic_domain, utsname()->domainname);
1471 printk(",\n bootserver=%pI4", &ic_servaddr);
1472 printk(", rootserver=%pI4", &root_server_addr);
1473 printk(", rootpath=%s", root_server_path);
1474 if (ic_dev_mtu)
1475 printk(", mtu=%d", ic_dev_mtu);
1476 printk("\n");
1477 #endif /* !SILENT */
1478
1479 return 0;
1480 }
1481
1482 late_initcall(ip_auto_config);
1483
1484
1485 /*
1486 * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
1487 * command line parameter. See Documentation/filesystems/nfs/nfsroot.txt.
1488 */
1489 static int __init ic_proto_name(char *name)
1490 {
1491 if (!strcmp(name, "on") || !strcmp(name, "any")) {
1492 return 1;
1493 }
1494 if (!strcmp(name, "off") || !strcmp(name, "none")) {
1495 return 0;
1496 }
1497 #ifdef CONFIG_IP_PNP_DHCP
1498 else if (!strcmp(name, "dhcp")) {
1499 ic_proto_enabled &= ~IC_RARP;
1500 return 1;
1501 }
1502 #endif
1503 #ifdef CONFIG_IP_PNP_BOOTP
1504 else if (!strcmp(name, "bootp")) {
1505 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP);
1506 return 1;
1507 }
1508 #endif
1509 #ifdef CONFIG_IP_PNP_RARP
1510 else if (!strcmp(name, "rarp")) {
1511 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP);
1512 return 1;
1513 }
1514 #endif
1515 #ifdef IPCONFIG_DYNAMIC
1516 else if (!strcmp(name, "both")) {
1517 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */
1518 return 1;
1519 }
1520 #endif
1521 return 0;
1522 }
1523
1524 static int __init ip_auto_config_setup(char *addrs)
1525 {
1526 char *cp, *ip, *dp;
1527 int num = 0;
1528
1529 ic_set_manually = 1;
1530 ic_enable = 1;
1531
1532 /*
1533 * If any dhcp, bootp etc options are set, leave autoconfig on
1534 * and skip the below static IP processing.
1535 */
1536 if (ic_proto_name(addrs))
1537 return 1;
1538
1539 /* If no static IP is given, turn off autoconfig and bail. */
1540 if (*addrs == 0 ||
1541 strcmp(addrs, "off") == 0 ||
1542 strcmp(addrs, "none") == 0) {
1543 ic_enable = 0;
1544 return 1;
1545 }
1546
1547 /* Parse string for static IP assignment. */
1548 ip = addrs;
1549 while (ip && *ip) {
1550 if ((cp = strchr(ip, ':')))
1551 *cp++ = '\0';
1552 if (strlen(ip) > 0) {
1553 DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip));
1554 switch (num) {
1555 case 0:
1556 if ((ic_myaddr = in_aton(ip)) == ANY)
1557 ic_myaddr = NONE;
1558 break;
1559 case 1:
1560 if ((ic_servaddr = in_aton(ip)) == ANY)
1561 ic_servaddr = NONE;
1562 break;
1563 case 2:
1564 if ((ic_gateway = in_aton(ip)) == ANY)
1565 ic_gateway = NONE;
1566 break;
1567 case 3:
1568 if ((ic_netmask = in_aton(ip)) == ANY)
1569 ic_netmask = NONE;
1570 break;
1571 case 4:
1572 if ((dp = strchr(ip, '.'))) {
1573 *dp++ = '\0';
1574 strlcpy(utsname()->domainname, dp,
1575 sizeof(utsname()->domainname));
1576 }
1577 strlcpy(utsname()->nodename, ip,
1578 sizeof(utsname()->nodename));
1579 ic_host_name_set = 1;
1580 break;
1581 case 5:
1582 strlcpy(user_dev_name, ip, sizeof(user_dev_name));
1583 break;
1584 case 6:
1585 if (ic_proto_name(ip) == 0 &&
1586 ic_myaddr == NONE) {
1587 ic_enable = 0;
1588 }
1589 break;
1590 }
1591 }
1592 ip = cp;
1593 num++;
1594 }
1595
1596 return 1;
1597 }
1598
1599 static int __init nfsaddrs_config_setup(char *addrs)
1600 {
1601 return ip_auto_config_setup(addrs);
1602 }
1603
1604 static int __init vendor_class_identifier_setup(char *addrs)
1605 {
1606 if (strlcpy(vendor_class_identifier, addrs,
1607 sizeof(vendor_class_identifier))
1608 >= sizeof(vendor_class_identifier))
1609 printk(KERN_WARNING "DHCP: vendorclass too long, truncated to \"%s\"",
1610 vendor_class_identifier);
1611 return 1;
1612 }
1613
1614 __setup("ip=", ip_auto_config_setup);
1615 __setup("nfsaddrs=", nfsaddrs_config_setup);
1616 __setup("dhcpclass=", vendor_class_identifier_setup);
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