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Linux 2.6.33-rc8
[linux-2.6/lguest.git] / net / ipv4 / ipconfig.c
blob10a6a604bf32bee0aa1f4a7d591557173919d296
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 <net/net_namespace.h>
57 #include <net/arp.h>
58 #include <net/ip.h>
59 #include <net/ipconfig.h>
60 #include <net/route.h>
61
62 #include <asm/uaccess.h>
63 #include <net/checksum.h>
64 #include <asm/processor.h>
65
66 /* Define this to allow debugging output */
67 #undef IPCONFIG_DEBUG
68
69 #ifdef IPCONFIG_DEBUG
70 #define DBG(x) printk x
71 #else
72 #define DBG(x) do { } while(0)
73 #endif
74
75 #if defined(CONFIG_IP_PNP_DHCP)
76 #define IPCONFIG_DHCP
77 #endif
78 #if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_DHCP)
79 #define IPCONFIG_BOOTP
80 #endif
81 #if defined(CONFIG_IP_PNP_RARP)
82 #define IPCONFIG_RARP
83 #endif
84 #if defined(IPCONFIG_BOOTP) || defined(IPCONFIG_RARP)
85 #define IPCONFIG_DYNAMIC
86 #endif
87
88 /* Define the friendly delay before and after opening net devices */
89 #define CONF_PRE_OPEN 500 /* Before opening: 1/2 second */
90 #define CONF_POST_OPEN 1 /* After opening: 1 second */
91
92 /* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */
93 #define CONF_OPEN_RETRIES 2 /* (Re)open devices twice */
94 #define CONF_SEND_RETRIES 6 /* Send six requests per open */
95 #define CONF_INTER_TIMEOUT (HZ/2) /* Inter-device timeout: 1/2 second */
96 #define CONF_BASE_TIMEOUT (HZ*2) /* Initial timeout: 2 seconds */
97 #define CONF_TIMEOUT_RANDOM (HZ) /* Maximum amount of randomization */
98 #define CONF_TIMEOUT_MULT *7/4 /* Rate of timeout growth */
99 #define CONF_TIMEOUT_MAX (HZ*30) /* Maximum allowed timeout */
100 #define CONF_NAMESERVERS_MAX 3 /* Maximum number of nameservers
101 - '3' from resolv.h */
102
103 #define NONE cpu_to_be32(INADDR_NONE)
104 #define ANY cpu_to_be32(INADDR_ANY)
105
106 /*
107 * Public IP configuration
108 */
109
110 /* This is used by platforms which might be able to set the ipconfig
111 * variables using firmware environment vars. If this is set, it will
112 * ignore such firmware variables.
113 */
114 int ic_set_manually __initdata = 0; /* IPconfig parameters set manually */
115
116 static int ic_enable __initdata = 0; /* IP config enabled? */
117
118 /* Protocol choice */
119 int ic_proto_enabled __initdata = 0
120 #ifdef IPCONFIG_BOOTP
121 | IC_BOOTP
122 #endif
123 #ifdef CONFIG_IP_PNP_DHCP
124 | IC_USE_DHCP
125 #endif
126 #ifdef IPCONFIG_RARP
127 | IC_RARP
128 #endif
129 ;
130
131 static int ic_host_name_set __initdata = 0; /* Host name set by us? */
132
133 __be32 ic_myaddr = NONE; /* My IP address */
134 static __be32 ic_netmask = NONE; /* Netmask for local subnet */
135 __be32 ic_gateway = NONE; /* Gateway IP address */
136
137 __be32 ic_servaddr = NONE; /* Boot server IP address */
138
139 __be32 root_server_addr = NONE; /* Address of NFS server */
140 u8 root_server_path[256] = { 0, }; /* Path to mount as root */
141
142 u32 ic_dev_xid; /* Device under configuration */
143
144 /* vendor class identifier */
145 static char vendor_class_identifier[253] __initdata;
146
147 /* Persistent data: */
148
149 static int ic_proto_used; /* Protocol used, if any */
150 static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */
151 static u8 ic_domain[64]; /* DNS (not NIS) domain name */
152
153 /*
154 * Private state.
155 */
156
157 /* Name of user-selected boot device */
158 static char user_dev_name[IFNAMSIZ] __initdata = { 0, };
159
160 /* Protocols supported by available interfaces */
161 static int ic_proto_have_if __initdata = 0;
162
163 /* MTU for boot device */
164 static int ic_dev_mtu __initdata = 0;
165
166 #ifdef IPCONFIG_DYNAMIC
167 static DEFINE_SPINLOCK(ic_recv_lock);
168 static volatile int ic_got_reply __initdata = 0; /* Proto(s) that replied */
169 #endif
170 #ifdef IPCONFIG_DHCP
171 static int ic_dhcp_msgtype __initdata = 0; /* DHCP msg type received */
172 #endif
173
174
175 /*
176 * Network devices
177 */
178
179 struct ic_device {
180 struct ic_device *next;
181 struct net_device *dev;
182 unsigned short flags;
183 short able;
184 __be32 xid;
185 };
186
187 static struct ic_device *ic_first_dev __initdata = NULL;/* List of open device */
188 static struct net_device *ic_dev __initdata = NULL; /* Selected device */
189
190 static int __init ic_open_devs(void)
191 {
192 struct ic_device *d, **last;
193 struct net_device *dev;
194 unsigned short oflags;
195
196 last = &ic_first_dev;
197 rtnl_lock();
198
199 /* bring loopback device up first */
200 for_each_netdev(&init_net, dev) {
201 if (!(dev->flags & IFF_LOOPBACK))
202 continue;
203 if (dev_change_flags(dev, dev->flags | IFF_UP) < 0)
204 printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name);
205 }
206
207 for_each_netdev(&init_net, dev) {
208 if (dev->flags & IFF_LOOPBACK)
209 continue;
210 if (user_dev_name[0] ? !strcmp(dev->name, user_dev_name) :
211 (!(dev->flags & IFF_LOOPBACK) &&
212 (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) &&
213 strncmp(dev->name, "dummy", 5))) {
214 int able = 0;
215 if (dev->mtu >= 364)
216 able |= IC_BOOTP;
217 else
218 printk(KERN_WARNING "DHCP/BOOTP: Ignoring device %s, MTU %d too small", dev->name, dev->mtu);
219 if (!(dev->flags & IFF_NOARP))
220 able |= IC_RARP;
221 able &= ic_proto_enabled;
222 if (ic_proto_enabled && !able)
223 continue;
224 oflags = dev->flags;
225 if (dev_change_flags(dev, oflags | IFF_UP) < 0) {
226 printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name);
227 continue;
228 }
229 if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) {
230 rtnl_unlock();
231 return -1;
232 }
233 d->dev = dev;
234 *last = d;
235 last = &d->next;
236 d->flags = oflags;
237 d->able = able;
238 if (able & IC_BOOTP)
239 get_random_bytes(&d->xid, sizeof(__be32));
240 else
241 d->xid = 0;
242 ic_proto_have_if |= able;
243 DBG(("IP-Config: %s UP (able=%d, xid=%08x)\n",
244 dev->name, able, d->xid));
245 }
246 }
247 rtnl_unlock();
248
249 *last = NULL;
250
251 if (!ic_first_dev) {
252 if (user_dev_name[0])
253 printk(KERN_ERR "IP-Config: Device `%s' not found.\n", user_dev_name);
254 else
255 printk(KERN_ERR "IP-Config: No network devices available.\n");
256 return -1;
257 }
258 return 0;
259 }
260
261 static void __init ic_close_devs(void)
262 {
263 struct ic_device *d, *next;
264 struct net_device *dev;
265
266 rtnl_lock();
267 next = ic_first_dev;
268 while ((d = next)) {
269 next = d->next;
270 dev = d->dev;
271 if (dev != ic_dev) {
272 DBG(("IP-Config: Downing %s\n", dev->name));
273 dev_change_flags(dev, d->flags);
274 }
275 kfree(d);
276 }
277 rtnl_unlock();
278 }
279
280 /*
281 * Interface to various network functions.
282 */
283
284 static inline void
285 set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port)
286 {
287 sin->sin_family = AF_INET;
288 sin->sin_addr.s_addr = addr;
289 sin->sin_port = port;
290 }
291
292 static int __init ic_devinet_ioctl(unsigned int cmd, struct ifreq *arg)
293 {
294 int res;
295
296 mm_segment_t oldfs = get_fs();
297 set_fs(get_ds());
298 res = devinet_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
299 set_fs(oldfs);
300 return res;
301 }
302
303 static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg)
304 {
305 int res;
306
307 mm_segment_t oldfs = get_fs();
308 set_fs(get_ds());
309 res = dev_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
310 set_fs(oldfs);
311 return res;
312 }
313
314 static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg)
315 {
316 int res;
317
318 mm_segment_t oldfs = get_fs();
319 set_fs(get_ds());
320 res = ip_rt_ioctl(&init_net, cmd, (void __user *) arg);
321 set_fs(oldfs);
322 return res;
323 }
324
325 /*
326 * Set up interface addresses and routes.
327 */
328
329 static int __init ic_setup_if(void)
330 {
331 struct ifreq ir;
332 struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr;
333 int err;
334
335 memset(&ir, 0, sizeof(ir));
336 strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name);
337 set_sockaddr(sin, ic_myaddr, 0);
338 if ((err = ic_devinet_ioctl(SIOCSIFADDR, &ir)) < 0) {
339 printk(KERN_ERR "IP-Config: Unable to set interface address (%d).\n", err);
340 return -1;
341 }
342 set_sockaddr(sin, ic_netmask, 0);
343 if ((err = ic_devinet_ioctl(SIOCSIFNETMASK, &ir)) < 0) {
344 printk(KERN_ERR "IP-Config: Unable to set interface netmask (%d).\n", err);
345 return -1;
346 }
347 set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0);
348 if ((err = ic_devinet_ioctl(SIOCSIFBRDADDR, &ir)) < 0) {
349 printk(KERN_ERR "IP-Config: Unable to set interface broadcast address (%d).\n", err);
350 return -1;
351 }
352 /* Handle the case where we need non-standard MTU on the boot link (a network
353 * using jumbo frames, for instance). If we can't set the mtu, don't error
354 * out, we'll try to muddle along.
355 */
356 if (ic_dev_mtu != 0) {
357 strcpy(ir.ifr_name, ic_dev->name);
358 ir.ifr_mtu = ic_dev_mtu;
359 if ((err = ic_dev_ioctl(SIOCSIFMTU, &ir)) < 0)
360 printk(KERN_ERR "IP-Config: Unable to set interface mtu to %d (%d).\n",
361 ic_dev_mtu, err);
362 }
363 return 0;
364 }
365
366 static int __init ic_setup_routes(void)
367 {
368 /* No need to setup device routes, only the default route... */
369
370 if (ic_gateway != NONE) {
371 struct rtentry rm;
372 int err;
373
374 memset(&rm, 0, sizeof(rm));
375 if ((ic_gateway ^ ic_myaddr) & ic_netmask) {
376 printk(KERN_ERR "IP-Config: Gateway not on directly connected network.\n");
377 return -1;
378 }
379 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0);
380 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0);
381 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0);
382 rm.rt_flags = RTF_UP | RTF_GATEWAY;
383 if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) {
384 printk(KERN_ERR "IP-Config: Cannot add default route (%d).\n", err);
385 return -1;
386 }
387 }
388
389 return 0;
390 }
391
392 /*
393 * Fill in default values for all missing parameters.
394 */
395
396 static int __init ic_defaults(void)
397 {
398 /*
399 * At this point we have no userspace running so need not
400 * claim locks on system_utsname
401 */
402
403 if (!ic_host_name_set)
404 sprintf(init_utsname()->nodename, "%pI4", &ic_myaddr);
405
406 if (root_server_addr == NONE)
407 root_server_addr = ic_servaddr;
408
409 if (ic_netmask == NONE) {
410 if (IN_CLASSA(ntohl(ic_myaddr)))
411 ic_netmask = htonl(IN_CLASSA_NET);
412 else if (IN_CLASSB(ntohl(ic_myaddr)))
413 ic_netmask = htonl(IN_CLASSB_NET);
414 else if (IN_CLASSC(ntohl(ic_myaddr)))
415 ic_netmask = htonl(IN_CLASSC_NET);
416 else {
417 printk(KERN_ERR "IP-Config: Unable to guess netmask for address %pI4\n",
418 &ic_myaddr);
419 return -1;
420 }
421 printk("IP-Config: Guessing netmask %pI4\n", &ic_netmask);
422 }
423
424 return 0;
425 }
426
427 /*
428 * RARP support.
429 */
430
431 #ifdef IPCONFIG_RARP
432
433 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
434
435 static struct packet_type rarp_packet_type __initdata = {
436 .type = cpu_to_be16(ETH_P_RARP),
437 .func = ic_rarp_recv,
438 };
439
440 static inline void __init ic_rarp_init(void)
441 {
442 dev_add_pack(&rarp_packet_type);
443 }
444
445 static inline void __init ic_rarp_cleanup(void)
446 {
447 dev_remove_pack(&rarp_packet_type);
448 }
449
450 /*
451 * Process received RARP packet.
452 */
453 static int __init
454 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
455 {
456 struct arphdr *rarp;
457 unsigned char *rarp_ptr;
458 __be32 sip, tip;
459 unsigned char *sha, *tha; /* s for "source", t for "target" */
460 struct ic_device *d;
461
462 if (!net_eq(dev_net(dev), &init_net))
463 goto drop;
464
465 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
466 return NET_RX_DROP;
467
468 if (!pskb_may_pull(skb, sizeof(struct arphdr)))
469 goto drop;
470
471 /* Basic sanity checks can be done without the lock. */
472 rarp = (struct arphdr *)skb_transport_header(skb);
473
474 /* If this test doesn't pass, it's not IP, or we should
475 * ignore it anyway.
476 */
477 if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd))
478 goto drop;
479
480 /* If it's not a RARP reply, delete it. */
481 if (rarp->ar_op != htons(ARPOP_RREPLY))
482 goto drop;
483
484 /* If it's not Ethernet, delete it. */
485 if (rarp->ar_pro != htons(ETH_P_IP))
486 goto drop;
487
488 if (!pskb_may_pull(skb, arp_hdr_len(dev)))
489 goto drop;
490
491 /* OK, it is all there and looks valid, process... */
492 rarp = (struct arphdr *)skb_transport_header(skb);
493 rarp_ptr = (unsigned char *) (rarp + 1);
494
495 /* One reply at a time, please. */
496 spin_lock(&ic_recv_lock);
497
498 /* If we already have a reply, just drop the packet */
499 if (ic_got_reply)
500 goto drop_unlock;
501
502 /* Find the ic_device that the packet arrived on */
503 d = ic_first_dev;
504 while (d && d->dev != dev)
505 d = d->next;
506 if (!d)
507 goto drop_unlock; /* should never happen */
508
509 /* Extract variable-width fields */
510 sha = rarp_ptr;
511 rarp_ptr += dev->addr_len;
512 memcpy(&sip, rarp_ptr, 4);
513 rarp_ptr += 4;
514 tha = rarp_ptr;
515 rarp_ptr += dev->addr_len;
516 memcpy(&tip, rarp_ptr, 4);
517
518 /* Discard packets which are not meant for us. */
519 if (memcmp(tha, dev->dev_addr, dev->addr_len))
520 goto drop_unlock;
521
522 /* Discard packets which are not from specified server. */
523 if (ic_servaddr != NONE && ic_servaddr != sip)
524 goto drop_unlock;
525
526 /* We have a winner! */
527 ic_dev = dev;
528 if (ic_myaddr == NONE)
529 ic_myaddr = tip;
530 ic_servaddr = sip;
531 ic_got_reply = IC_RARP;
532
533 drop_unlock:
534 /* Show's over. Nothing to see here. */
535 spin_unlock(&ic_recv_lock);
536
537 drop:
538 /* Throw the packet out. */
539 kfree_skb(skb);
540 return 0;
541 }
542
543
544 /*
545 * Send RARP request packet over a single interface.
546 */
547 static void __init ic_rarp_send_if(struct ic_device *d)
548 {
549 struct net_device *dev = d->dev;
550 arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL,
551 dev->dev_addr, dev->dev_addr);
552 }
553 #endif
554
555 /*
556 * DHCP/BOOTP support.
557 */
558
559 #ifdef IPCONFIG_BOOTP
560
561 struct bootp_pkt { /* BOOTP packet format */
562 struct iphdr iph; /* IP header */
563 struct udphdr udph; /* UDP header */
564 u8 op; /* 1=request, 2=reply */
565 u8 htype; /* HW address type */
566 u8 hlen; /* HW address length */
567 u8 hops; /* Used only by gateways */
568 __be32 xid; /* Transaction ID */
569 __be16 secs; /* Seconds since we started */
570 __be16 flags; /* Just what it says */
571 __be32 client_ip; /* Client's IP address if known */
572 __be32 your_ip; /* Assigned IP address */
573 __be32 server_ip; /* (Next, e.g. NFS) Server's IP address */
574 __be32 relay_ip; /* IP address of BOOTP relay */
575 u8 hw_addr[16]; /* Client's HW address */
576 u8 serv_name[64]; /* Server host name */
577 u8 boot_file[128]; /* Name of boot file */
578 u8 exten[312]; /* DHCP options / BOOTP vendor extensions */
579 };
580
581 /* packet ops */
582 #define BOOTP_REQUEST 1
583 #define BOOTP_REPLY 2
584
585 /* DHCP message types */
586 #define DHCPDISCOVER 1
587 #define DHCPOFFER 2
588 #define DHCPREQUEST 3
589 #define DHCPDECLINE 4
590 #define DHCPACK 5
591 #define DHCPNAK 6
592 #define DHCPRELEASE 7
593 #define DHCPINFORM 8
594
595 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
596
597 static struct packet_type bootp_packet_type __initdata = {
598 .type = cpu_to_be16(ETH_P_IP),
599 .func = ic_bootp_recv,
600 };
601
602
603 /*
604 * Initialize DHCP/BOOTP extension fields in the request.
605 */
606
607 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 };
608
609 #ifdef IPCONFIG_DHCP
610
611 static void __init
612 ic_dhcp_init_options(u8 *options)
613 {
614 u8 mt = ((ic_servaddr == NONE)
615 ? DHCPDISCOVER : DHCPREQUEST);
616 u8 *e = options;
617 int len;
618
619 #ifdef IPCONFIG_DEBUG
620 printk("DHCP: Sending message type %d\n", mt);
621 #endif
622
623 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */
624 e += 4;
625
626 *e++ = 53; /* DHCP message type */
627 *e++ = 1;
628 *e++ = mt;
629
630 if (mt == DHCPREQUEST) {
631 *e++ = 54; /* Server ID (IP address) */
632 *e++ = 4;
633 memcpy(e, &ic_servaddr, 4);
634 e += 4;
635
636 *e++ = 50; /* Requested IP address */
637 *e++ = 4;
638 memcpy(e, &ic_myaddr, 4);
639 e += 4;
640 }
641
642 /* always? */
643 {
644 static const u8 ic_req_params[] = {
645 1, /* Subnet mask */
646 3, /* Default gateway */
647 6, /* DNS server */
648 12, /* Host name */
649 15, /* Domain name */
650 17, /* Boot path */
651 26, /* MTU */
652 40, /* NIS domain name */
653 };
654
655 *e++ = 55; /* Parameter request list */
656 *e++ = sizeof(ic_req_params);
657 memcpy(e, ic_req_params, sizeof(ic_req_params));
658 e += sizeof(ic_req_params);
659
660 if (*vendor_class_identifier) {
661 printk(KERN_INFO "DHCP: sending class identifier \"%s\"\n",
662 vendor_class_identifier);
663 *e++ = 60; /* Class-identifier */
664 len = strlen(vendor_class_identifier);
665 *e++ = len;
666 memcpy(e, vendor_class_identifier, len);
667 e += len;
668 }
669 }
670
671 *e++ = 255; /* End of the list */
672 }
673
674 #endif /* IPCONFIG_DHCP */
675
676 static void __init ic_bootp_init_ext(u8 *e)
677 {
678 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */
679 e += 4;
680 *e++ = 1; /* Subnet mask request */
681 *e++ = 4;
682 e += 4;
683 *e++ = 3; /* Default gateway request */
684 *e++ = 4;
685 e += 4;
686 *e++ = 5; /* Name server request */
687 *e++ = 8;
688 e += 8;
689 *e++ = 12; /* Host name request */
690 *e++ = 32;
691 e += 32;
692 *e++ = 40; /* NIS Domain name request */
693 *e++ = 32;
694 e += 32;
695 *e++ = 17; /* Boot path */
696 *e++ = 40;
697 e += 40;
698
699 *e++ = 57; /* set extension buffer size for reply */
700 *e++ = 2;
701 *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */
702 *e++ = 150;
703
704 *e++ = 255; /* End of the list */
705 }
706
707
708 /*
709 * Initialize the DHCP/BOOTP mechanism.
710 */
711 static inline void __init ic_bootp_init(void)
712 {
713 int i;
714
715 for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
716 ic_nameservers[i] = NONE;
717
718 dev_add_pack(&bootp_packet_type);
719 }
720
721
722 /*
723 * DHCP/BOOTP cleanup.
724 */
725 static inline void __init ic_bootp_cleanup(void)
726 {
727 dev_remove_pack(&bootp_packet_type);
728 }
729
730
731 /*
732 * Send DHCP/BOOTP request to single interface.
733 */
734 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff)
735 {
736 struct net_device *dev = d->dev;
737 struct sk_buff *skb;
738 struct bootp_pkt *b;
739 struct iphdr *h;
740
741 /* Allocate packet */
742 skb = alloc_skb(sizeof(struct bootp_pkt) + LL_ALLOCATED_SPACE(dev) + 15,
743 GFP_KERNEL);
744 if (!skb)
745 return;
746 skb_reserve(skb, LL_RESERVED_SPACE(dev));
747 b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt));
748 memset(b, 0, sizeof(struct bootp_pkt));
749
750 /* Construct IP header */
751 skb_reset_network_header(skb);
752 h = ip_hdr(skb);
753 h->version = 4;
754 h->ihl = 5;
755 h->tot_len = htons(sizeof(struct bootp_pkt));
756 h->frag_off = htons(IP_DF);
757 h->ttl = 64;
758 h->protocol = IPPROTO_UDP;
759 h->daddr = htonl(INADDR_BROADCAST);
760 h->check = ip_fast_csum((unsigned char *) h, h->ihl);
761
762 /* Construct UDP header */
763 b->udph.source = htons(68);
764 b->udph.dest = htons(67);
765 b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr));
766 /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */
767
768 /* Construct DHCP/BOOTP header */
769 b->op = BOOTP_REQUEST;
770 if (dev->type < 256) /* check for false types */
771 b->htype = dev->type;
772 else if (dev->type == ARPHRD_IEEE802_TR) /* fix for token ring */
773 b->htype = ARPHRD_IEEE802;
774 else if (dev->type == ARPHRD_FDDI)
775 b->htype = ARPHRD_ETHER;
776 else {
777 printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name);
778 b->htype = dev->type; /* can cause undefined behavior */
779 }
780
781 /* server_ip and your_ip address are both already zero per RFC2131 */
782 b->hlen = dev->addr_len;
783 memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
784 b->secs = htons(jiffies_diff / HZ);
785 b->xid = d->xid;
786
787 /* add DHCP options or BOOTP extensions */
788 #ifdef IPCONFIG_DHCP
789 if (ic_proto_enabled & IC_USE_DHCP)
790 ic_dhcp_init_options(b->exten);
791 else
792 #endif
793 ic_bootp_init_ext(b->exten);
794
795 /* Chain packet down the line... */
796 skb->dev = dev;
797 skb->protocol = htons(ETH_P_IP);
798 if (dev_hard_header(skb, dev, ntohs(skb->protocol),
799 dev->broadcast, dev->dev_addr, skb->len) < 0 ||
800 dev_queue_xmit(skb) < 0)
801 printk("E");
802 }
803
804
805 /*
806 * Copy BOOTP-supplied string if not already set.
807 */
808 static int __init ic_bootp_string(char *dest, char *src, int len, int max)
809 {
810 if (!len)
811 return 0;
812 if (len > max-1)
813 len = max-1;
814 memcpy(dest, src, len);
815 dest[len] = '\0';
816 return 1;
817 }
818
819
820 /*
821 * Process BOOTP extensions.
822 */
823 static void __init ic_do_bootp_ext(u8 *ext)
824 {
825 u8 servers;
826 int i;
827 u16 mtu;
828
829 #ifdef IPCONFIG_DEBUG
830 u8 *c;
831
832 printk("DHCP/BOOTP: Got extension %d:",*ext);
833 for (c=ext+2; c<ext+2+ext[1]; c++)
834 printk(" %02x", *c);
835 printk("\n");
836 #endif
837
838 switch (*ext++) {
839 case 1: /* Subnet mask */
840 if (ic_netmask == NONE)
841 memcpy(&ic_netmask, ext+1, 4);
842 break;
843 case 3: /* Default gateway */
844 if (ic_gateway == NONE)
845 memcpy(&ic_gateway, ext+1, 4);
846 break;
847 case 6: /* DNS server */
848 servers= *ext/4;
849 if (servers > CONF_NAMESERVERS_MAX)
850 servers = CONF_NAMESERVERS_MAX;
851 for (i = 0; i < servers; i++) {
852 if (ic_nameservers[i] == NONE)
853 memcpy(&ic_nameservers[i], ext+1+4*i, 4);
854 }
855 break;
856 case 12: /* Host name */
857 ic_bootp_string(utsname()->nodename, ext+1, *ext, __NEW_UTS_LEN);
858 ic_host_name_set = 1;
859 break;
860 case 15: /* Domain name (DNS) */
861 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
862 break;
863 case 17: /* Root path */
864 if (!root_server_path[0])
865 ic_bootp_string(root_server_path, ext+1, *ext, sizeof(root_server_path));
866 break;
867 case 26: /* Interface MTU */
868 memcpy(&mtu, ext+1, sizeof(mtu));
869 ic_dev_mtu = ntohs(mtu);
870 break;
871 case 40: /* NIS Domain name (_not_ DNS) */
872 ic_bootp_string(utsname()->domainname, ext+1, *ext, __NEW_UTS_LEN);
873 break;
874 }
875 }
876
877
878 /*
879 * Receive BOOTP reply.
880 */
881 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
882 {
883 struct bootp_pkt *b;
884 struct iphdr *h;
885 struct ic_device *d;
886 int len, ext_len;
887
888 if (!net_eq(dev_net(dev), &init_net))
889 goto drop;
890
891 /* Perform verifications before taking the lock. */
892 if (skb->pkt_type == PACKET_OTHERHOST)
893 goto drop;
894
895 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
896 return NET_RX_DROP;
897
898 if (!pskb_may_pull(skb,
899 sizeof(struct iphdr) +
900 sizeof(struct udphdr)))
901 goto drop;
902
903 b = (struct bootp_pkt *)skb_network_header(skb);
904 h = &b->iph;
905
906 if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP)
907 goto drop;
908
909 /* Fragments are not supported */
910 if (h->frag_off & htons(IP_OFFSET | IP_MF)) {
911 if (net_ratelimit())
912 printk(KERN_ERR "DHCP/BOOTP: Ignoring fragmented "
913 "reply.\n");
914 goto drop;
915 }
916
917 if (skb->len < ntohs(h->tot_len))
918 goto drop;
919
920 if (ip_fast_csum((char *) h, h->ihl))
921 goto drop;
922
923 if (b->udph.source != htons(67) || b->udph.dest != htons(68))
924 goto drop;
925
926 if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
927 goto drop;
928
929 len = ntohs(b->udph.len) - sizeof(struct udphdr);
930 ext_len = len - (sizeof(*b) -
931 sizeof(struct iphdr) -
932 sizeof(struct udphdr) -
933 sizeof(b->exten));
934 if (ext_len < 0)
935 goto drop;
936
937 /* Ok the front looks good, make sure we can get at the rest. */
938 if (!pskb_may_pull(skb, skb->len))
939 goto drop;
940
941 b = (struct bootp_pkt *)skb_network_header(skb);
942 h = &b->iph;
943
944 /* One reply at a time, please. */
945 spin_lock(&ic_recv_lock);
946
947 /* If we already have a reply, just drop the packet */
948 if (ic_got_reply)
949 goto drop_unlock;
950
951 /* Find the ic_device that the packet arrived on */
952 d = ic_first_dev;
953 while (d && d->dev != dev)
954 d = d->next;
955 if (!d)
956 goto drop_unlock; /* should never happen */
957
958 /* Is it a reply to our BOOTP request? */
959 if (b->op != BOOTP_REPLY ||
960 b->xid != d->xid) {
961 if (net_ratelimit())
962 printk(KERN_ERR "DHCP/BOOTP: Reply not for us, "
963 "op[%x] xid[%x]\n",
964 b->op, b->xid);
965 goto drop_unlock;
966 }
967
968 /* Is it a reply for the device we are configuring? */
969 if (b->xid != ic_dev_xid) {
970 if (net_ratelimit())
971 printk(KERN_ERR "DHCP/BOOTP: Ignoring delayed packet \n");
972 goto drop_unlock;
973 }
974
975 /* Parse extensions */
976 if (ext_len >= 4 &&
977 !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */
978 u8 *end = (u8 *) b + ntohs(b->iph.tot_len);
979 u8 *ext;
980
981 #ifdef IPCONFIG_DHCP
982 if (ic_proto_enabled & IC_USE_DHCP) {
983 __be32 server_id = NONE;
984 int mt = 0;
985
986 ext = &b->exten[4];
987 while (ext < end && *ext != 0xff) {
988 u8 *opt = ext++;
989 if (*opt == 0) /* Padding */
990 continue;
991 ext += *ext + 1;
992 if (ext >= end)
993 break;
994 switch (*opt) {
995 case 53: /* Message type */
996 if (opt[1])
997 mt = opt[2];
998 break;
999 case 54: /* Server ID (IP address) */
1000 if (opt[1] >= 4)
1001 memcpy(&server_id, opt + 2, 4);
1002 break;
1003 }
1004 }
1005
1006 #ifdef IPCONFIG_DEBUG
1007 printk("DHCP: Got message type %d\n", mt);
1008 #endif
1009
1010 switch (mt) {
1011 case DHCPOFFER:
1012 /* While in the process of accepting one offer,
1013 * ignore all others.
1014 */
1015 if (ic_myaddr != NONE)
1016 goto drop_unlock;
1017
1018 /* Let's accept that offer. */
1019 ic_myaddr = b->your_ip;
1020 ic_servaddr = server_id;
1021 #ifdef IPCONFIG_DEBUG
1022 printk("DHCP: Offered address %pI4 by server %pI4\n",
1023 &ic_myaddr, &ic_servaddr);
1024 #endif
1025 /* The DHCP indicated server address takes
1026 * precedence over the bootp header one if
1027 * they are different.
1028 */
1029 if ((server_id != NONE) &&
1030 (b->server_ip != server_id))
1031 b->server_ip = ic_servaddr;
1032 break;
1033
1034 case DHCPACK:
1035 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0)
1036 goto drop_unlock;
1037
1038 /* Yeah! */
1039 break;
1040
1041 default:
1042 /* Urque. Forget it*/
1043 ic_myaddr = NONE;
1044 ic_servaddr = NONE;
1045 goto drop_unlock;
1046 }
1047
1048 ic_dhcp_msgtype = mt;
1049
1050 }
1051 #endif /* IPCONFIG_DHCP */
1052
1053 ext = &b->exten[4];
1054 while (ext < end && *ext != 0xff) {
1055 u8 *opt = ext++;
1056 if (*opt == 0) /* Padding */
1057 continue;
1058 ext += *ext + 1;
1059 if (ext < end)
1060 ic_do_bootp_ext(opt);
1061 }
1062 }
1063
1064 /* We have a winner! */
1065 ic_dev = dev;
1066 ic_myaddr = b->your_ip;
1067 ic_servaddr = b->server_ip;
1068 if (ic_gateway == NONE && b->relay_ip)
1069 ic_gateway = b->relay_ip;
1070 if (ic_nameservers[0] == NONE)
1071 ic_nameservers[0] = ic_servaddr;
1072 ic_got_reply = IC_BOOTP;
1073
1074 drop_unlock:
1075 /* Show's over. Nothing to see here. */
1076 spin_unlock(&ic_recv_lock);
1077
1078 drop:
1079 /* Throw the packet out. */
1080 kfree_skb(skb);
1081
1082 return 0;
1083 }
1084
1085
1086 #endif
1087
1088
1089 /*
1090 * Dynamic IP configuration -- DHCP, BOOTP, RARP.
1091 */
1092
1093 #ifdef IPCONFIG_DYNAMIC
1094
1095 static int __init ic_dynamic(void)
1096 {
1097 int retries;
1098 struct ic_device *d;
1099 unsigned long start_jiffies, timeout, jiff;
1100 int do_bootp = ic_proto_have_if & IC_BOOTP;
1101 int do_rarp = ic_proto_have_if & IC_RARP;
1102
1103 /*
1104 * If none of DHCP/BOOTP/RARP was selected, return with an error.
1105 * This routine gets only called when some pieces of information
1106 * are missing, and without DHCP/BOOTP/RARP we are unable to get it.
1107 */
1108 if (!ic_proto_enabled) {
1109 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
1110 return -1;
1111 }
1112
1113 #ifdef IPCONFIG_BOOTP
1114 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
1115 printk(KERN_ERR "DHCP/BOOTP: No suitable device found.\n");
1116 #endif
1117 #ifdef IPCONFIG_RARP
1118 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)
1119 printk(KERN_ERR "RARP: No suitable device found.\n");
1120 #endif
1121
1122 if (!ic_proto_have_if)
1123 /* Error message already printed */
1124 return -1;
1125
1126 /*
1127 * Setup protocols
1128 */
1129 #ifdef IPCONFIG_BOOTP
1130 if (do_bootp)
1131 ic_bootp_init();
1132 #endif
1133 #ifdef IPCONFIG_RARP
1134 if (do_rarp)
1135 ic_rarp_init();
1136 #endif
1137
1138 /*
1139 * Send requests and wait, until we get an answer. This loop
1140 * seems to be a terrible waste of CPU time, but actually there is
1141 * only one process running at all, so we don't need to use any
1142 * scheduler functions.
1143 * [Actually we could now, but the nothing else running note still
1144 * applies.. - AC]
1145 */
1146 printk(KERN_NOTICE "Sending %s%s%s requests .",
1147 do_bootp
1148 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "",
1149 (do_bootp && do_rarp) ? " and " : "",
1150 do_rarp ? "RARP" : "");
1151
1152 start_jiffies = jiffies;
1153 d = ic_first_dev;
1154 retries = CONF_SEND_RETRIES;
1155 get_random_bytes(&timeout, sizeof(timeout));
1156 timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned) CONF_TIMEOUT_RANDOM);
1157 for (;;) {
1158 /* Track the device we are configuring */
1159 ic_dev_xid = d->xid;
1160
1161 #ifdef IPCONFIG_BOOTP
1162 if (do_bootp && (d->able & IC_BOOTP))
1163 ic_bootp_send_if(d, jiffies - start_jiffies);
1164 #endif
1165 #ifdef IPCONFIG_RARP
1166 if (do_rarp && (d->able & IC_RARP))
1167 ic_rarp_send_if(d);
1168 #endif
1169
1170 jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout);
1171 while (time_before(jiffies, jiff) && !ic_got_reply)
1172 schedule_timeout_uninterruptible(1);
1173 #ifdef IPCONFIG_DHCP
1174 /* DHCP isn't done until we get a DHCPACK. */
1175 if ((ic_got_reply & IC_BOOTP) &&
1176 (ic_proto_enabled & IC_USE_DHCP) &&
1177 ic_dhcp_msgtype != DHCPACK) {
1178 ic_got_reply = 0;
1179 printk(",");
1180 continue;
1181 }
1182 #endif /* IPCONFIG_DHCP */
1183
1184 if (ic_got_reply) {
1185 printk(" OK\n");
1186 break;
1187 }
1188
1189 if ((d = d->next))
1190 continue;
1191
1192 if (! --retries) {
1193 printk(" timed out!\n");
1194 break;
1195 }
1196
1197 d = ic_first_dev;
1198
1199 timeout = timeout CONF_TIMEOUT_MULT;
1200 if (timeout > CONF_TIMEOUT_MAX)
1201 timeout = CONF_TIMEOUT_MAX;
1202
1203 printk(".");
1204 }
1205
1206 #ifdef IPCONFIG_BOOTP
1207 if (do_bootp)
1208 ic_bootp_cleanup();
1209 #endif
1210 #ifdef IPCONFIG_RARP
1211 if (do_rarp)
1212 ic_rarp_cleanup();
1213 #endif
1214
1215 if (!ic_got_reply) {
1216 ic_myaddr = NONE;
1217 return -1;
1218 }
1219
1220 printk("IP-Config: Got %s answer from %pI4, ",
1221 ((ic_got_reply & IC_RARP) ? "RARP"
1222 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),
1223 &ic_servaddr);
1224 printk("my address is %pI4\n", &ic_myaddr);
1225
1226 return 0;
1227 }
1228
1229 #endif /* IPCONFIG_DYNAMIC */
1230
1231 #ifdef CONFIG_PROC_FS
1232
1233 static int pnp_seq_show(struct seq_file *seq, void *v)
1234 {
1235 int i;
1236
1237 if (ic_proto_used & IC_PROTO)
1238 seq_printf(seq, "#PROTO: %s\n",
1239 (ic_proto_used & IC_RARP) ? "RARP"
1240 : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP");
1241 else
1242 seq_puts(seq, "#MANUAL\n");
1243
1244 if (ic_domain[0])
1245 seq_printf(seq,
1246 "domain %s\n", ic_domain);
1247 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {
1248 if (ic_nameservers[i] != NONE)
1249 seq_printf(seq, "nameserver %pI4\n",
1250 &ic_nameservers[i]);
1251 }
1252 if (ic_servaddr != NONE)
1253 seq_printf(seq, "bootserver %pI4\n",
1254 &ic_servaddr);
1255 return 0;
1256 }
1257
1258 static int pnp_seq_open(struct inode *indoe, struct file *file)
1259 {
1260 return single_open(file, pnp_seq_show, NULL);
1261 }
1262
1263 static const struct file_operations pnp_seq_fops = {
1264 .owner = THIS_MODULE,
1265 .open = pnp_seq_open,
1266 .read = seq_read,
1267 .llseek = seq_lseek,
1268 .release = single_release,
1269 };
1270 #endif /* CONFIG_PROC_FS */
1271
1272 /*
1273 * Extract IP address from the parameter string if needed. Note that we
1274 * need to have root_server_addr set _before_ IPConfig gets called as it
1275 * can override it.
1276 */
1277 __be32 __init root_nfs_parse_addr(char *name)
1278 {
1279 __be32 addr;
1280 int octets = 0;
1281 char *cp, *cq;
1282
1283 cp = cq = name;
1284 while (octets < 4) {
1285 while (*cp >= '0' && *cp <= '9')
1286 cp++;
1287 if (cp == cq || cp - cq > 3)
1288 break;
1289 if (*cp == '.' || octets == 3)
1290 octets++;
1291 if (octets < 4)
1292 cp++;
1293 cq = cp;
1294 }
1295 if (octets == 4 && (*cp == ':' || *cp == '\0')) {
1296 if (*cp == ':')
1297 *cp++ = '\0';
1298 addr = in_aton(name);
1299 memmove(name, cp, strlen(cp) + 1);
1300 } else
1301 addr = NONE;
1302
1303 return addr;
1304 }
1305
1306 /*
1307 * IP Autoconfig dispatcher.
1308 */
1309
1310 static int __init ip_auto_config(void)
1311 {
1312 __be32 addr;
1313 #ifdef IPCONFIG_DYNAMIC
1314 int retries = CONF_OPEN_RETRIES;
1315 #endif
1316
1317 #ifdef CONFIG_PROC_FS
1318 proc_net_fops_create(&init_net, "pnp", S_IRUGO, &pnp_seq_fops);
1319 #endif /* CONFIG_PROC_FS */
1320
1321 if (!ic_enable)
1322 return 0;
1323
1324 DBG(("IP-Config: Entered.\n"));
1325 #ifdef IPCONFIG_DYNAMIC
1326 try_try_again:
1327 #endif
1328 /* Give hardware a chance to settle */
1329 msleep(CONF_PRE_OPEN);
1330
1331 /* Setup all network devices */
1332 if (ic_open_devs() < 0)
1333 return -1;
1334
1335 /* Give drivers a chance to settle */
1336 ssleep(CONF_POST_OPEN);
1337
1338 /*
1339 * If the config information is insufficient (e.g., our IP address or
1340 * IP address of the boot server is missing or we have multiple network
1341 * interfaces and no default was set), use BOOTP or RARP to get the
1342 * missing values.
1343 */
1344 if (ic_myaddr == NONE ||
1345 #ifdef CONFIG_ROOT_NFS
1346 (root_server_addr == NONE &&
1347 ic_servaddr == NONE &&
1348 ROOT_DEV == Root_NFS) ||
1349 #endif
1350 ic_first_dev->next) {
1351 #ifdef IPCONFIG_DYNAMIC
1352 if (ic_dynamic() < 0) {
1353 ic_close_devs();
1354
1355 /*
1356 * I don't know why, but sometimes the
1357 * eepro100 driver (at least) gets upset and
1358 * doesn't work the first time it's opened.
1359 * But then if you close it and reopen it, it
1360 * works just fine. So we need to try that at
1361 * least once before giving up.
1362 *
1363 * Also, if the root will be NFS-mounted, we
1364 * have nowhere to go if DHCP fails. So we
1365 * just have to keep trying forever.
1366 *
1367 * -- Chip
1368 */
1369 #ifdef CONFIG_ROOT_NFS
1370 if (ROOT_DEV == Root_NFS) {
1371 printk(KERN_ERR
1372 "IP-Config: Retrying forever (NFS root)...\n");
1373 goto try_try_again;
1374 }
1375 #endif
1376
1377 if (--retries) {
1378 printk(KERN_ERR
1379 "IP-Config: Reopening network devices...\n");
1380 goto try_try_again;
1381 }
1382
1383 /* Oh, well. At least we tried. */
1384 printk(KERN_ERR "IP-Config: Auto-configuration of network failed.\n");
1385 return -1;
1386 }
1387 #else /* !DYNAMIC */
1388 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
1389 ic_close_devs();
1390 return -1;
1391 #endif /* IPCONFIG_DYNAMIC */
1392 } else {
1393 /* Device selected manually or only one device -> use it */
1394 ic_dev = ic_first_dev->dev;
1395 }
1396
1397 addr = root_nfs_parse_addr(root_server_path);
1398 if (root_server_addr == NONE)
1399 root_server_addr = addr;
1400
1401 /*
1402 * Use defaults whereever applicable.
1403 */
1404 if (ic_defaults() < 0)
1405 return -1;
1406
1407 /*
1408 * Close all network devices except the device we've
1409 * autoconfigured and set up routes.
1410 */
1411 ic_close_devs();
1412 if (ic_setup_if() < 0 || ic_setup_routes() < 0)
1413 return -1;
1414
1415 /*
1416 * Record which protocol was actually used.
1417 */
1418 #ifdef IPCONFIG_DYNAMIC
1419 ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP);
1420 #endif
1421
1422 #ifndef IPCONFIG_SILENT
1423 /*
1424 * Clue in the operator.
1425 */
1426 printk("IP-Config: Complete:");
1427 printk("\n device=%s", ic_dev->name);
1428 printk(", addr=%pI4", &ic_myaddr);
1429 printk(", mask=%pI4", &ic_netmask);
1430 printk(", gw=%pI4", &ic_gateway);
1431 printk(",\n host=%s, domain=%s, nis-domain=%s",
1432 utsname()->nodename, ic_domain, utsname()->domainname);
1433 printk(",\n bootserver=%pI4", &ic_servaddr);
1434 printk(", rootserver=%pI4", &root_server_addr);
1435 printk(", rootpath=%s", root_server_path);
1436 if (ic_dev_mtu)
1437 printk(", mtu=%d", ic_dev_mtu);
1438 printk("\n");
1439 #endif /* !SILENT */
1440
1441 return 0;
1442 }
1443
1444 late_initcall(ip_auto_config);
1445
1446
1447 /*
1448 * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
1449 * command line parameter. See Documentation/filesystems/nfs/nfsroot.txt.
1450 */
1451 static int __init ic_proto_name(char *name)
1452 {
1453 if (!strcmp(name, "on") || !strcmp(name, "any")) {
1454 return 1;
1455 }
1456 if (!strcmp(name, "off") || !strcmp(name, "none")) {
1457 return 0;
1458 }
1459 #ifdef CONFIG_IP_PNP_DHCP
1460 else if (!strcmp(name, "dhcp")) {
1461 ic_proto_enabled &= ~IC_RARP;
1462 return 1;
1463 }
1464 #endif
1465 #ifdef CONFIG_IP_PNP_BOOTP
1466 else if (!strcmp(name, "bootp")) {
1467 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP);
1468 return 1;
1469 }
1470 #endif
1471 #ifdef CONFIG_IP_PNP_RARP
1472 else if (!strcmp(name, "rarp")) {
1473 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP);
1474 return 1;
1475 }
1476 #endif
1477 #ifdef IPCONFIG_DYNAMIC
1478 else if (!strcmp(name, "both")) {
1479 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */
1480 return 1;
1481 }
1482 #endif
1483 return 0;
1484 }
1485
1486 static int __init ip_auto_config_setup(char *addrs)
1487 {
1488 char *cp, *ip, *dp;
1489 int num = 0;
1490
1491 ic_set_manually = 1;
1492 ic_enable = 1;
1493
1494 /*
1495 * If any dhcp, bootp etc options are set, leave autoconfig on
1496 * and skip the below static IP processing.
1497 */
1498 if (ic_proto_name(addrs))
1499 return 1;
1500
1501 /* If no static IP is given, turn off autoconfig and bail. */
1502 if (*addrs == 0 ||
1503 strcmp(addrs, "off") == 0 ||
1504 strcmp(addrs, "none") == 0) {
1505 ic_enable = 0;
1506 return 1;
1507 }
1508
1509 /* Parse string for static IP assignment. */
1510 ip = addrs;
1511 while (ip && *ip) {
1512 if ((cp = strchr(ip, ':')))
1513 *cp++ = '\0';
1514 if (strlen(ip) > 0) {
1515 DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip));
1516 switch (num) {
1517 case 0:
1518 if ((ic_myaddr = in_aton(ip)) == ANY)
1519 ic_myaddr = NONE;
1520 break;
1521 case 1:
1522 if ((ic_servaddr = in_aton(ip)) == ANY)
1523 ic_servaddr = NONE;
1524 break;
1525 case 2:
1526 if ((ic_gateway = in_aton(ip)) == ANY)
1527 ic_gateway = NONE;
1528 break;
1529 case 3:
1530 if ((ic_netmask = in_aton(ip)) == ANY)
1531 ic_netmask = NONE;
1532 break;
1533 case 4:
1534 if ((dp = strchr(ip, '.'))) {
1535 *dp++ = '\0';
1536 strlcpy(utsname()->domainname, dp,
1537 sizeof(utsname()->domainname));
1538 }
1539 strlcpy(utsname()->nodename, ip,
1540 sizeof(utsname()->nodename));
1541 ic_host_name_set = 1;
1542 break;
1543 case 5:
1544 strlcpy(user_dev_name, ip, sizeof(user_dev_name));
1545 break;
1546 case 6:
1547 if (ic_proto_name(ip) == 0 &&
1548 ic_myaddr == NONE) {
1549 ic_enable = 0;
1550 }
1551 break;
1552 }
1553 }
1554 ip = cp;
1555 num++;
1556 }
1557
1558 return 1;
1559 }
1560
1561 static int __init nfsaddrs_config_setup(char *addrs)
1562 {
1563 return ip_auto_config_setup(addrs);
1564 }
1565
1566 static int __init vendor_class_identifier_setup(char *addrs)
1567 {
1568 if (strlcpy(vendor_class_identifier, addrs,
1569 sizeof(vendor_class_identifier))
1570 >= sizeof(vendor_class_identifier))
1571 printk(KERN_WARNING "DHCP: vendorclass too long, truncated to \"%s\"",
1572 vendor_class_identifier);
1573 return 1;
1574 }
1575
1576 __setup("ip=", ip_auto_config_setup);
1577 __setup("nfsaddrs=", nfsaddrs_config_setup);
1578 __setup("dhcpclass=", vendor_class_identifier_setup);
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