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Merge git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstable
[linux-2.6/mini2440.git] / net / ipv4 / ipconfig.c
blob88bf051d0cbb4cd8989b44b8e894e6ab0ac60e53
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 #ifdef IPCONFIG_DYNAMIC
164 static DEFINE_SPINLOCK(ic_recv_lock);
165 static volatile int ic_got_reply __initdata = 0; /* Proto(s) that replied */
166 #endif
167 #ifdef IPCONFIG_DHCP
168 static int ic_dhcp_msgtype __initdata = 0; /* DHCP msg type received */
169 #endif
170
171
172 /*
173 * Network devices
174 */
175
176 struct ic_device {
177 struct ic_device *next;
178 struct net_device *dev;
179 unsigned short flags;
180 short able;
181 __be32 xid;
182 };
183
184 static struct ic_device *ic_first_dev __initdata = NULL;/* List of open device */
185 static struct net_device *ic_dev __initdata = NULL; /* Selected device */
186
187 static int __init ic_open_devs(void)
188 {
189 struct ic_device *d, **last;
190 struct net_device *dev;
191 unsigned short oflags;
192
193 last = &ic_first_dev;
194 rtnl_lock();
195
196 /* bring loopback device up first */
197 for_each_netdev(&init_net, dev) {
198 if (!(dev->flags & IFF_LOOPBACK))
199 continue;
200 if (dev_change_flags(dev, dev->flags | IFF_UP) < 0)
201 printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name);
202 }
203
204 for_each_netdev(&init_net, dev) {
205 if (dev->flags & IFF_LOOPBACK)
206 continue;
207 if (user_dev_name[0] ? !strcmp(dev->name, user_dev_name) :
208 (!(dev->flags & IFF_LOOPBACK) &&
209 (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) &&
210 strncmp(dev->name, "dummy", 5))) {
211 int able = 0;
212 if (dev->mtu >= 364)
213 able |= IC_BOOTP;
214 else
215 printk(KERN_WARNING "DHCP/BOOTP: Ignoring device %s, MTU %d too small", dev->name, dev->mtu);
216 if (!(dev->flags & IFF_NOARP))
217 able |= IC_RARP;
218 able &= ic_proto_enabled;
219 if (ic_proto_enabled && !able)
220 continue;
221 oflags = dev->flags;
222 if (dev_change_flags(dev, oflags | IFF_UP) < 0) {
223 printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name);
224 continue;
225 }
226 if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) {
227 rtnl_unlock();
228 return -1;
229 }
230 d->dev = dev;
231 *last = d;
232 last = &d->next;
233 d->flags = oflags;
234 d->able = able;
235 if (able & IC_BOOTP)
236 get_random_bytes(&d->xid, sizeof(__be32));
237 else
238 d->xid = 0;
239 ic_proto_have_if |= able;
240 DBG(("IP-Config: %s UP (able=%d, xid=%08x)\n",
241 dev->name, able, d->xid));
242 }
243 }
244 rtnl_unlock();
245
246 *last = NULL;
247
248 if (!ic_first_dev) {
249 if (user_dev_name[0])
250 printk(KERN_ERR "IP-Config: Device `%s' not found.\n", user_dev_name);
251 else
252 printk(KERN_ERR "IP-Config: No network devices available.\n");
253 return -1;
254 }
255 return 0;
256 }
257
258 static void __init ic_close_devs(void)
259 {
260 struct ic_device *d, *next;
261 struct net_device *dev;
262
263 rtnl_lock();
264 next = ic_first_dev;
265 while ((d = next)) {
266 next = d->next;
267 dev = d->dev;
268 if (dev != ic_dev) {
269 DBG(("IP-Config: Downing %s\n", dev->name));
270 dev_change_flags(dev, d->flags);
271 }
272 kfree(d);
273 }
274 rtnl_unlock();
275 }
276
277 /*
278 * Interface to various network functions.
279 */
280
281 static inline void
282 set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port)
283 {
284 sin->sin_family = AF_INET;
285 sin->sin_addr.s_addr = addr;
286 sin->sin_port = port;
287 }
288
289 static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg)
290 {
291 int res;
292
293 mm_segment_t oldfs = get_fs();
294 set_fs(get_ds());
295 res = devinet_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
296 set_fs(oldfs);
297 return res;
298 }
299
300 static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg)
301 {
302 int res;
303
304 mm_segment_t oldfs = get_fs();
305 set_fs(get_ds());
306 res = ip_rt_ioctl(&init_net, cmd, (void __user *) arg);
307 set_fs(oldfs);
308 return res;
309 }
310
311 /*
312 * Set up interface addresses and routes.
313 */
314
315 static int __init ic_setup_if(void)
316 {
317 struct ifreq ir;
318 struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr;
319 int err;
320
321 memset(&ir, 0, sizeof(ir));
322 strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name);
323 set_sockaddr(sin, ic_myaddr, 0);
324 if ((err = ic_dev_ioctl(SIOCSIFADDR, &ir)) < 0) {
325 printk(KERN_ERR "IP-Config: Unable to set interface address (%d).\n", err);
326 return -1;
327 }
328 set_sockaddr(sin, ic_netmask, 0);
329 if ((err = ic_dev_ioctl(SIOCSIFNETMASK, &ir)) < 0) {
330 printk(KERN_ERR "IP-Config: Unable to set interface netmask (%d).\n", err);
331 return -1;
332 }
333 set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0);
334 if ((err = ic_dev_ioctl(SIOCSIFBRDADDR, &ir)) < 0) {
335 printk(KERN_ERR "IP-Config: Unable to set interface broadcast address (%d).\n", err);
336 return -1;
337 }
338 return 0;
339 }
340
341 static int __init ic_setup_routes(void)
342 {
343 /* No need to setup device routes, only the default route... */
344
345 if (ic_gateway != NONE) {
346 struct rtentry rm;
347 int err;
348
349 memset(&rm, 0, sizeof(rm));
350 if ((ic_gateway ^ ic_myaddr) & ic_netmask) {
351 printk(KERN_ERR "IP-Config: Gateway not on directly connected network.\n");
352 return -1;
353 }
354 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0);
355 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0);
356 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0);
357 rm.rt_flags = RTF_UP | RTF_GATEWAY;
358 if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) {
359 printk(KERN_ERR "IP-Config: Cannot add default route (%d).\n", err);
360 return -1;
361 }
362 }
363
364 return 0;
365 }
366
367 /*
368 * Fill in default values for all missing parameters.
369 */
370
371 static int __init ic_defaults(void)
372 {
373 /*
374 * At this point we have no userspace running so need not
375 * claim locks on system_utsname
376 */
377
378 if (!ic_host_name_set)
379 sprintf(init_utsname()->nodename, "%pI4", &ic_myaddr);
380
381 if (root_server_addr == NONE)
382 root_server_addr = ic_servaddr;
383
384 if (ic_netmask == NONE) {
385 if (IN_CLASSA(ntohl(ic_myaddr)))
386 ic_netmask = htonl(IN_CLASSA_NET);
387 else if (IN_CLASSB(ntohl(ic_myaddr)))
388 ic_netmask = htonl(IN_CLASSB_NET);
389 else if (IN_CLASSC(ntohl(ic_myaddr)))
390 ic_netmask = htonl(IN_CLASSC_NET);
391 else {
392 printk(KERN_ERR "IP-Config: Unable to guess netmask for address %pI4\n",
393 &ic_myaddr);
394 return -1;
395 }
396 printk("IP-Config: Guessing netmask %pI4\n", &ic_netmask);
397 }
398
399 return 0;
400 }
401
402 /*
403 * RARP support.
404 */
405
406 #ifdef IPCONFIG_RARP
407
408 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
409
410 static struct packet_type rarp_packet_type __initdata = {
411 .type = cpu_to_be16(ETH_P_RARP),
412 .func = ic_rarp_recv,
413 };
414
415 static inline void __init ic_rarp_init(void)
416 {
417 dev_add_pack(&rarp_packet_type);
418 }
419
420 static inline void __init ic_rarp_cleanup(void)
421 {
422 dev_remove_pack(&rarp_packet_type);
423 }
424
425 /*
426 * Process received RARP packet.
427 */
428 static int __init
429 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
430 {
431 struct arphdr *rarp;
432 unsigned char *rarp_ptr;
433 __be32 sip, tip;
434 unsigned char *sha, *tha; /* s for "source", t for "target" */
435 struct ic_device *d;
436
437 if (!net_eq(dev_net(dev), &init_net))
438 goto drop;
439
440 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
441 return NET_RX_DROP;
442
443 if (!pskb_may_pull(skb, sizeof(struct arphdr)))
444 goto drop;
445
446 /* Basic sanity checks can be done without the lock. */
447 rarp = (struct arphdr *)skb_transport_header(skb);
448
449 /* If this test doesn't pass, it's not IP, or we should
450 * ignore it anyway.
451 */
452 if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd))
453 goto drop;
454
455 /* If it's not a RARP reply, delete it. */
456 if (rarp->ar_op != htons(ARPOP_RREPLY))
457 goto drop;
458
459 /* If it's not Ethernet, delete it. */
460 if (rarp->ar_pro != htons(ETH_P_IP))
461 goto drop;
462
463 if (!pskb_may_pull(skb, arp_hdr_len(dev)))
464 goto drop;
465
466 /* OK, it is all there and looks valid, process... */
467 rarp = (struct arphdr *)skb_transport_header(skb);
468 rarp_ptr = (unsigned char *) (rarp + 1);
469
470 /* One reply at a time, please. */
471 spin_lock(&ic_recv_lock);
472
473 /* If we already have a reply, just drop the packet */
474 if (ic_got_reply)
475 goto drop_unlock;
476
477 /* Find the ic_device that the packet arrived on */
478 d = ic_first_dev;
479 while (d && d->dev != dev)
480 d = d->next;
481 if (!d)
482 goto drop_unlock; /* should never happen */
483
484 /* Extract variable-width fields */
485 sha = rarp_ptr;
486 rarp_ptr += dev->addr_len;
487 memcpy(&sip, rarp_ptr, 4);
488 rarp_ptr += 4;
489 tha = rarp_ptr;
490 rarp_ptr += dev->addr_len;
491 memcpy(&tip, rarp_ptr, 4);
492
493 /* Discard packets which are not meant for us. */
494 if (memcmp(tha, dev->dev_addr, dev->addr_len))
495 goto drop_unlock;
496
497 /* Discard packets which are not from specified server. */
498 if (ic_servaddr != NONE && ic_servaddr != sip)
499 goto drop_unlock;
500
501 /* We have a winner! */
502 ic_dev = dev;
503 if (ic_myaddr == NONE)
504 ic_myaddr = tip;
505 ic_servaddr = sip;
506 ic_got_reply = IC_RARP;
507
508 drop_unlock:
509 /* Show's over. Nothing to see here. */
510 spin_unlock(&ic_recv_lock);
511
512 drop:
513 /* Throw the packet out. */
514 kfree_skb(skb);
515 return 0;
516 }
517
518
519 /*
520 * Send RARP request packet over a single interface.
521 */
522 static void __init ic_rarp_send_if(struct ic_device *d)
523 {
524 struct net_device *dev = d->dev;
525 arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL,
526 dev->dev_addr, dev->dev_addr);
527 }
528 #endif
529
530 /*
531 * DHCP/BOOTP support.
532 */
533
534 #ifdef IPCONFIG_BOOTP
535
536 struct bootp_pkt { /* BOOTP packet format */
537 struct iphdr iph; /* IP header */
538 struct udphdr udph; /* UDP header */
539 u8 op; /* 1=request, 2=reply */
540 u8 htype; /* HW address type */
541 u8 hlen; /* HW address length */
542 u8 hops; /* Used only by gateways */
543 __be32 xid; /* Transaction ID */
544 __be16 secs; /* Seconds since we started */
545 __be16 flags; /* Just what it says */
546 __be32 client_ip; /* Client's IP address if known */
547 __be32 your_ip; /* Assigned IP address */
548 __be32 server_ip; /* (Next, e.g. NFS) Server's IP address */
549 __be32 relay_ip; /* IP address of BOOTP relay */
550 u8 hw_addr[16]; /* Client's HW address */
551 u8 serv_name[64]; /* Server host name */
552 u8 boot_file[128]; /* Name of boot file */
553 u8 exten[312]; /* DHCP options / BOOTP vendor extensions */
554 };
555
556 /* packet ops */
557 #define BOOTP_REQUEST 1
558 #define BOOTP_REPLY 2
559
560 /* DHCP message types */
561 #define DHCPDISCOVER 1
562 #define DHCPOFFER 2
563 #define DHCPREQUEST 3
564 #define DHCPDECLINE 4
565 #define DHCPACK 5
566 #define DHCPNAK 6
567 #define DHCPRELEASE 7
568 #define DHCPINFORM 8
569
570 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
571
572 static struct packet_type bootp_packet_type __initdata = {
573 .type = cpu_to_be16(ETH_P_IP),
574 .func = ic_bootp_recv,
575 };
576
577
578 /*
579 * Initialize DHCP/BOOTP extension fields in the request.
580 */
581
582 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 };
583
584 #ifdef IPCONFIG_DHCP
585
586 static void __init
587 ic_dhcp_init_options(u8 *options)
588 {
589 u8 mt = ((ic_servaddr == NONE)
590 ? DHCPDISCOVER : DHCPREQUEST);
591 u8 *e = options;
592 int len;
593
594 #ifdef IPCONFIG_DEBUG
595 printk("DHCP: Sending message type %d\n", mt);
596 #endif
597
598 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */
599 e += 4;
600
601 *e++ = 53; /* DHCP message type */
602 *e++ = 1;
603 *e++ = mt;
604
605 if (mt == DHCPREQUEST) {
606 *e++ = 54; /* Server ID (IP address) */
607 *e++ = 4;
608 memcpy(e, &ic_servaddr, 4);
609 e += 4;
610
611 *e++ = 50; /* Requested IP address */
612 *e++ = 4;
613 memcpy(e, &ic_myaddr, 4);
614 e += 4;
615 }
616
617 /* always? */
618 {
619 static const u8 ic_req_params[] = {
620 1, /* Subnet mask */
621 3, /* Default gateway */
622 6, /* DNS server */
623 12, /* Host name */
624 15, /* Domain name */
625 17, /* Boot path */
626 40, /* NIS domain name */
627 };
628
629 *e++ = 55; /* Parameter request list */
630 *e++ = sizeof(ic_req_params);
631 memcpy(e, ic_req_params, sizeof(ic_req_params));
632 e += sizeof(ic_req_params);
633
634 if (*vendor_class_identifier) {
635 printk(KERN_INFO "DHCP: sending class identifier \"%s\"\n",
636 vendor_class_identifier);
637 *e++ = 60; /* Class-identifier */
638 len = strlen(vendor_class_identifier);
639 *e++ = len;
640 memcpy(e, vendor_class_identifier, len);
641 e += len;
642 }
643 }
644
645 *e++ = 255; /* End of the list */
646 }
647
648 #endif /* IPCONFIG_DHCP */
649
650 static void __init ic_bootp_init_ext(u8 *e)
651 {
652 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */
653 e += 4;
654 *e++ = 1; /* Subnet mask request */
655 *e++ = 4;
656 e += 4;
657 *e++ = 3; /* Default gateway request */
658 *e++ = 4;
659 e += 4;
660 *e++ = 5; /* Name server request */
661 *e++ = 8;
662 e += 8;
663 *e++ = 12; /* Host name request */
664 *e++ = 32;
665 e += 32;
666 *e++ = 40; /* NIS Domain name request */
667 *e++ = 32;
668 e += 32;
669 *e++ = 17; /* Boot path */
670 *e++ = 40;
671 e += 40;
672
673 *e++ = 57; /* set extension buffer size for reply */
674 *e++ = 2;
675 *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */
676 *e++ = 150;
677
678 *e++ = 255; /* End of the list */
679 }
680
681
682 /*
683 * Initialize the DHCP/BOOTP mechanism.
684 */
685 static inline void __init ic_bootp_init(void)
686 {
687 int i;
688
689 for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
690 ic_nameservers[i] = NONE;
691
692 dev_add_pack(&bootp_packet_type);
693 }
694
695
696 /*
697 * DHCP/BOOTP cleanup.
698 */
699 static inline void __init ic_bootp_cleanup(void)
700 {
701 dev_remove_pack(&bootp_packet_type);
702 }
703
704
705 /*
706 * Send DHCP/BOOTP request to single interface.
707 */
708 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff)
709 {
710 struct net_device *dev = d->dev;
711 struct sk_buff *skb;
712 struct bootp_pkt *b;
713 struct iphdr *h;
714
715 /* Allocate packet */
716 skb = alloc_skb(sizeof(struct bootp_pkt) + LL_ALLOCATED_SPACE(dev) + 15,
717 GFP_KERNEL);
718 if (!skb)
719 return;
720 skb_reserve(skb, LL_RESERVED_SPACE(dev));
721 b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt));
722 memset(b, 0, sizeof(struct bootp_pkt));
723
724 /* Construct IP header */
725 skb_reset_network_header(skb);
726 h = ip_hdr(skb);
727 h->version = 4;
728 h->ihl = 5;
729 h->tot_len = htons(sizeof(struct bootp_pkt));
730 h->frag_off = htons(IP_DF);
731 h->ttl = 64;
732 h->protocol = IPPROTO_UDP;
733 h->daddr = htonl(INADDR_BROADCAST);
734 h->check = ip_fast_csum((unsigned char *) h, h->ihl);
735
736 /* Construct UDP header */
737 b->udph.source = htons(68);
738 b->udph.dest = htons(67);
739 b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr));
740 /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */
741
742 /* Construct DHCP/BOOTP header */
743 b->op = BOOTP_REQUEST;
744 if (dev->type < 256) /* check for false types */
745 b->htype = dev->type;
746 else if (dev->type == ARPHRD_IEEE802_TR) /* fix for token ring */
747 b->htype = ARPHRD_IEEE802;
748 else if (dev->type == ARPHRD_FDDI)
749 b->htype = ARPHRD_ETHER;
750 else {
751 printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name);
752 b->htype = dev->type; /* can cause undefined behavior */
753 }
754
755 /* server_ip and your_ip address are both already zero per RFC2131 */
756 b->hlen = dev->addr_len;
757 memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
758 b->secs = htons(jiffies_diff / HZ);
759 b->xid = d->xid;
760
761 /* add DHCP options or BOOTP extensions */
762 #ifdef IPCONFIG_DHCP
763 if (ic_proto_enabled & IC_USE_DHCP)
764 ic_dhcp_init_options(b->exten);
765 else
766 #endif
767 ic_bootp_init_ext(b->exten);
768
769 /* Chain packet down the line... */
770 skb->dev = dev;
771 skb->protocol = htons(ETH_P_IP);
772 if (dev_hard_header(skb, dev, ntohs(skb->protocol),
773 dev->broadcast, dev->dev_addr, skb->len) < 0 ||
774 dev_queue_xmit(skb) < 0)
775 printk("E");
776 }
777
778
779 /*
780 * Copy BOOTP-supplied string if not already set.
781 */
782 static int __init ic_bootp_string(char *dest, char *src, int len, int max)
783 {
784 if (!len)
785 return 0;
786 if (len > max-1)
787 len = max-1;
788 memcpy(dest, src, len);
789 dest[len] = '\0';
790 return 1;
791 }
792
793
794 /*
795 * Process BOOTP extensions.
796 */
797 static void __init ic_do_bootp_ext(u8 *ext)
798 {
799 u8 servers;
800 int i;
801
802 #ifdef IPCONFIG_DEBUG
803 u8 *c;
804
805 printk("DHCP/BOOTP: Got extension %d:",*ext);
806 for (c=ext+2; c<ext+2+ext[1]; c++)
807 printk(" %02x", *c);
808 printk("\n");
809 #endif
810
811 switch (*ext++) {
812 case 1: /* Subnet mask */
813 if (ic_netmask == NONE)
814 memcpy(&ic_netmask, ext+1, 4);
815 break;
816 case 3: /* Default gateway */
817 if (ic_gateway == NONE)
818 memcpy(&ic_gateway, ext+1, 4);
819 break;
820 case 6: /* DNS server */
821 servers= *ext/4;
822 if (servers > CONF_NAMESERVERS_MAX)
823 servers = CONF_NAMESERVERS_MAX;
824 for (i = 0; i < servers; i++) {
825 if (ic_nameservers[i] == NONE)
826 memcpy(&ic_nameservers[i], ext+1+4*i, 4);
827 }
828 break;
829 case 12: /* Host name */
830 ic_bootp_string(utsname()->nodename, ext+1, *ext, __NEW_UTS_LEN);
831 ic_host_name_set = 1;
832 break;
833 case 15: /* Domain name (DNS) */
834 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
835 break;
836 case 17: /* Root path */
837 if (!root_server_path[0])
838 ic_bootp_string(root_server_path, ext+1, *ext, sizeof(root_server_path));
839 break;
840 case 40: /* NIS Domain name (_not_ DNS) */
841 ic_bootp_string(utsname()->domainname, ext+1, *ext, __NEW_UTS_LEN);
842 break;
843 }
844 }
845
846
847 /*
848 * Receive BOOTP reply.
849 */
850 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
851 {
852 struct bootp_pkt *b;
853 struct iphdr *h;
854 struct ic_device *d;
855 int len, ext_len;
856
857 if (!net_eq(dev_net(dev), &init_net))
858 goto drop;
859
860 /* Perform verifications before taking the lock. */
861 if (skb->pkt_type == PACKET_OTHERHOST)
862 goto drop;
863
864 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
865 return NET_RX_DROP;
866
867 if (!pskb_may_pull(skb,
868 sizeof(struct iphdr) +
869 sizeof(struct udphdr)))
870 goto drop;
871
872 b = (struct bootp_pkt *)skb_network_header(skb);
873 h = &b->iph;
874
875 if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP)
876 goto drop;
877
878 /* Fragments are not supported */
879 if (h->frag_off & htons(IP_OFFSET | IP_MF)) {
880 if (net_ratelimit())
881 printk(KERN_ERR "DHCP/BOOTP: Ignoring fragmented "
882 "reply.\n");
883 goto drop;
884 }
885
886 if (skb->len < ntohs(h->tot_len))
887 goto drop;
888
889 if (ip_fast_csum((char *) h, h->ihl))
890 goto drop;
891
892 if (b->udph.source != htons(67) || b->udph.dest != htons(68))
893 goto drop;
894
895 if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
896 goto drop;
897
898 len = ntohs(b->udph.len) - sizeof(struct udphdr);
899 ext_len = len - (sizeof(*b) -
900 sizeof(struct iphdr) -
901 sizeof(struct udphdr) -
902 sizeof(b->exten));
903 if (ext_len < 0)
904 goto drop;
905
906 /* Ok the front looks good, make sure we can get at the rest. */
907 if (!pskb_may_pull(skb, skb->len))
908 goto drop;
909
910 b = (struct bootp_pkt *)skb_network_header(skb);
911 h = &b->iph;
912
913 /* One reply at a time, please. */
914 spin_lock(&ic_recv_lock);
915
916 /* If we already have a reply, just drop the packet */
917 if (ic_got_reply)
918 goto drop_unlock;
919
920 /* Find the ic_device that the packet arrived on */
921 d = ic_first_dev;
922 while (d && d->dev != dev)
923 d = d->next;
924 if (!d)
925 goto drop_unlock; /* should never happen */
926
927 /* Is it a reply to our BOOTP request? */
928 if (b->op != BOOTP_REPLY ||
929 b->xid != d->xid) {
930 if (net_ratelimit())
931 printk(KERN_ERR "DHCP/BOOTP: Reply not for us, "
932 "op[%x] xid[%x]\n",
933 b->op, b->xid);
934 goto drop_unlock;
935 }
936
937 /* Is it a reply for the device we are configuring? */
938 if (b->xid != ic_dev_xid) {
939 if (net_ratelimit())
940 printk(KERN_ERR "DHCP/BOOTP: Ignoring delayed packet \n");
941 goto drop_unlock;
942 }
943
944 /* Parse extensions */
945 if (ext_len >= 4 &&
946 !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */
947 u8 *end = (u8 *) b + ntohs(b->iph.tot_len);
948 u8 *ext;
949
950 #ifdef IPCONFIG_DHCP
951 if (ic_proto_enabled & IC_USE_DHCP) {
952 __be32 server_id = NONE;
953 int mt = 0;
954
955 ext = &b->exten[4];
956 while (ext < end && *ext != 0xff) {
957 u8 *opt = ext++;
958 if (*opt == 0) /* Padding */
959 continue;
960 ext += *ext + 1;
961 if (ext >= end)
962 break;
963 switch (*opt) {
964 case 53: /* Message type */
965 if (opt[1])
966 mt = opt[2];
967 break;
968 case 54: /* Server ID (IP address) */
969 if (opt[1] >= 4)
970 memcpy(&server_id, opt + 2, 4);
971 break;
972 }
973 }
974
975 #ifdef IPCONFIG_DEBUG
976 printk("DHCP: Got message type %d\n", mt);
977 #endif
978
979 switch (mt) {
980 case DHCPOFFER:
981 /* While in the process of accepting one offer,
982 * ignore all others.
983 */
984 if (ic_myaddr != NONE)
985 goto drop_unlock;
986
987 /* Let's accept that offer. */
988 ic_myaddr = b->your_ip;
989 ic_servaddr = server_id;
990 #ifdef IPCONFIG_DEBUG
991 printk("DHCP: Offered address %pI4 by server %pI4\n",
992 &ic_myaddr, &ic_servaddr);
993 #endif
994 /* The DHCP indicated server address takes
995 * precedence over the bootp header one if
996 * they are different.
997 */
998 if ((server_id != NONE) &&
999 (b->server_ip != server_id))
1000 b->server_ip = ic_servaddr;
1001 break;
1002
1003 case DHCPACK:
1004 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0)
1005 goto drop_unlock;
1006
1007 /* Yeah! */
1008 break;
1009
1010 default:
1011 /* Urque. Forget it*/
1012 ic_myaddr = NONE;
1013 ic_servaddr = NONE;
1014 goto drop_unlock;
1015 }
1016
1017 ic_dhcp_msgtype = mt;
1018
1019 }
1020 #endif /* IPCONFIG_DHCP */
1021
1022 ext = &b->exten[4];
1023 while (ext < end && *ext != 0xff) {
1024 u8 *opt = ext++;
1025 if (*opt == 0) /* Padding */
1026 continue;
1027 ext += *ext + 1;
1028 if (ext < end)
1029 ic_do_bootp_ext(opt);
1030 }
1031 }
1032
1033 /* We have a winner! */
1034 ic_dev = dev;
1035 ic_myaddr = b->your_ip;
1036 ic_servaddr = b->server_ip;
1037 if (ic_gateway == NONE && b->relay_ip)
1038 ic_gateway = b->relay_ip;
1039 if (ic_nameservers[0] == NONE)
1040 ic_nameservers[0] = ic_servaddr;
1041 ic_got_reply = IC_BOOTP;
1042
1043 drop_unlock:
1044 /* Show's over. Nothing to see here. */
1045 spin_unlock(&ic_recv_lock);
1046
1047 drop:
1048 /* Throw the packet out. */
1049 kfree_skb(skb);
1050
1051 return 0;
1052 }
1053
1054
1055 #endif
1056
1057
1058 /*
1059 * Dynamic IP configuration -- DHCP, BOOTP, RARP.
1060 */
1061
1062 #ifdef IPCONFIG_DYNAMIC
1063
1064 static int __init ic_dynamic(void)
1065 {
1066 int retries;
1067 struct ic_device *d;
1068 unsigned long start_jiffies, timeout, jiff;
1069 int do_bootp = ic_proto_have_if & IC_BOOTP;
1070 int do_rarp = ic_proto_have_if & IC_RARP;
1071
1072 /*
1073 * If none of DHCP/BOOTP/RARP was selected, return with an error.
1074 * This routine gets only called when some pieces of information
1075 * are missing, and without DHCP/BOOTP/RARP we are unable to get it.
1076 */
1077 if (!ic_proto_enabled) {
1078 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
1079 return -1;
1080 }
1081
1082 #ifdef IPCONFIG_BOOTP
1083 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
1084 printk(KERN_ERR "DHCP/BOOTP: No suitable device found.\n");
1085 #endif
1086 #ifdef IPCONFIG_RARP
1087 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)
1088 printk(KERN_ERR "RARP: No suitable device found.\n");
1089 #endif
1090
1091 if (!ic_proto_have_if)
1092 /* Error message already printed */
1093 return -1;
1094
1095 /*
1096 * Setup protocols
1097 */
1098 #ifdef IPCONFIG_BOOTP
1099 if (do_bootp)
1100 ic_bootp_init();
1101 #endif
1102 #ifdef IPCONFIG_RARP
1103 if (do_rarp)
1104 ic_rarp_init();
1105 #endif
1106
1107 /*
1108 * Send requests and wait, until we get an answer. This loop
1109 * seems to be a terrible waste of CPU time, but actually there is
1110 * only one process running at all, so we don't need to use any
1111 * scheduler functions.
1112 * [Actually we could now, but the nothing else running note still
1113 * applies.. - AC]
1114 */
1115 printk(KERN_NOTICE "Sending %s%s%s requests .",
1116 do_bootp
1117 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "",
1118 (do_bootp && do_rarp) ? " and " : "",
1119 do_rarp ? "RARP" : "");
1120
1121 start_jiffies = jiffies;
1122 d = ic_first_dev;
1123 retries = CONF_SEND_RETRIES;
1124 get_random_bytes(&timeout, sizeof(timeout));
1125 timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned) CONF_TIMEOUT_RANDOM);
1126 for (;;) {
1127 /* Track the device we are configuring */
1128 ic_dev_xid = d->xid;
1129
1130 #ifdef IPCONFIG_BOOTP
1131 if (do_bootp && (d->able & IC_BOOTP))
1132 ic_bootp_send_if(d, jiffies - start_jiffies);
1133 #endif
1134 #ifdef IPCONFIG_RARP
1135 if (do_rarp && (d->able & IC_RARP))
1136 ic_rarp_send_if(d);
1137 #endif
1138
1139 jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout);
1140 while (time_before(jiffies, jiff) && !ic_got_reply)
1141 schedule_timeout_uninterruptible(1);
1142 #ifdef IPCONFIG_DHCP
1143 /* DHCP isn't done until we get a DHCPACK. */
1144 if ((ic_got_reply & IC_BOOTP)
1145 && (ic_proto_enabled & IC_USE_DHCP)
1146 && ic_dhcp_msgtype != DHCPACK)
1147 {
1148 ic_got_reply = 0;
1149 printk(",");
1150 continue;
1151 }
1152 #endif /* IPCONFIG_DHCP */
1153
1154 if (ic_got_reply) {
1155 printk(" OK\n");
1156 break;
1157 }
1158
1159 if ((d = d->next))
1160 continue;
1161
1162 if (! --retries) {
1163 printk(" timed out!\n");
1164 break;
1165 }
1166
1167 d = ic_first_dev;
1168
1169 timeout = timeout CONF_TIMEOUT_MULT;
1170 if (timeout > CONF_TIMEOUT_MAX)
1171 timeout = CONF_TIMEOUT_MAX;
1172
1173 printk(".");
1174 }
1175
1176 #ifdef IPCONFIG_BOOTP
1177 if (do_bootp)
1178 ic_bootp_cleanup();
1179 #endif
1180 #ifdef IPCONFIG_RARP
1181 if (do_rarp)
1182 ic_rarp_cleanup();
1183 #endif
1184
1185 if (!ic_got_reply) {
1186 ic_myaddr = NONE;
1187 return -1;
1188 }
1189
1190 printk("IP-Config: Got %s answer from %pI4, ",
1191 ((ic_got_reply & IC_RARP) ? "RARP"
1192 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),
1193 &ic_servaddr);
1194 printk("my address is %pI4\n", &ic_myaddr);
1195
1196 return 0;
1197 }
1198
1199 #endif /* IPCONFIG_DYNAMIC */
1200
1201 #ifdef CONFIG_PROC_FS
1202
1203 static int pnp_seq_show(struct seq_file *seq, void *v)
1204 {
1205 int i;
1206
1207 if (ic_proto_used & IC_PROTO)
1208 seq_printf(seq, "#PROTO: %s\n",
1209 (ic_proto_used & IC_RARP) ? "RARP"
1210 : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP");
1211 else
1212 seq_puts(seq, "#MANUAL\n");
1213
1214 if (ic_domain[0])
1215 seq_printf(seq,
1216 "domain %s\n", ic_domain);
1217 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {
1218 if (ic_nameservers[i] != NONE)
1219 seq_printf(seq, "nameserver %pI4\n",
1220 &ic_nameservers[i]);
1221 }
1222 if (ic_servaddr != NONE)
1223 seq_printf(seq, "bootserver %pI4\n",
1224 &ic_servaddr);
1225 return 0;
1226 }
1227
1228 static int pnp_seq_open(struct inode *indoe, struct file *file)
1229 {
1230 return single_open(file, pnp_seq_show, NULL);
1231 }
1232
1233 static const struct file_operations pnp_seq_fops = {
1234 .owner = THIS_MODULE,
1235 .open = pnp_seq_open,
1236 .read = seq_read,
1237 .llseek = seq_lseek,
1238 .release = single_release,
1239 };
1240 #endif /* CONFIG_PROC_FS */
1241
1242 /*
1243 * Extract IP address from the parameter string if needed. Note that we
1244 * need to have root_server_addr set _before_ IPConfig gets called as it
1245 * can override it.
1246 */
1247 __be32 __init root_nfs_parse_addr(char *name)
1248 {
1249 __be32 addr;
1250 int octets = 0;
1251 char *cp, *cq;
1252
1253 cp = cq = name;
1254 while (octets < 4) {
1255 while (*cp >= '0' && *cp <= '9')
1256 cp++;
1257 if (cp == cq || cp - cq > 3)
1258 break;
1259 if (*cp == '.' || octets == 3)
1260 octets++;
1261 if (octets < 4)
1262 cp++;
1263 cq = cp;
1264 }
1265 if (octets == 4 && (*cp == ':' || *cp == '\0')) {
1266 if (*cp == ':')
1267 *cp++ = '\0';
1268 addr = in_aton(name);
1269 memmove(name, cp, strlen(cp) + 1);
1270 } else
1271 addr = NONE;
1272
1273 return addr;
1274 }
1275
1276 /*
1277 * IP Autoconfig dispatcher.
1278 */
1279
1280 static int __init ip_auto_config(void)
1281 {
1282 __be32 addr;
1283 #ifdef IPCONFIG_DYNAMIC
1284 int retries = CONF_OPEN_RETRIES;
1285 #endif
1286
1287 #ifdef CONFIG_PROC_FS
1288 proc_net_fops_create(&init_net, "pnp", S_IRUGO, &pnp_seq_fops);
1289 #endif /* CONFIG_PROC_FS */
1290
1291 if (!ic_enable)
1292 return 0;
1293
1294 DBG(("IP-Config: Entered.\n"));
1295 #ifdef IPCONFIG_DYNAMIC
1296 try_try_again:
1297 #endif
1298 /* Give hardware a chance to settle */
1299 msleep(CONF_PRE_OPEN);
1300
1301 /* Setup all network devices */
1302 if (ic_open_devs() < 0)
1303 return -1;
1304
1305 /* Give drivers a chance to settle */
1306 ssleep(CONF_POST_OPEN);
1307
1308 /*
1309 * If the config information is insufficient (e.g., our IP address or
1310 * IP address of the boot server is missing or we have multiple network
1311 * interfaces and no default was set), use BOOTP or RARP to get the
1312 * missing values.
1313 */
1314 if (ic_myaddr == NONE ||
1315 #ifdef CONFIG_ROOT_NFS
1316 (root_server_addr == NONE
1317 && ic_servaddr == NONE
1318 && ROOT_DEV == Root_NFS) ||
1319 #endif
1320 ic_first_dev->next) {
1321 #ifdef IPCONFIG_DYNAMIC
1322 if (ic_dynamic() < 0) {
1323 ic_close_devs();
1324
1325 /*
1326 * I don't know why, but sometimes the
1327 * eepro100 driver (at least) gets upset and
1328 * doesn't work the first time it's opened.
1329 * But then if you close it and reopen it, it
1330 * works just fine. So we need to try that at
1331 * least once before giving up.
1332 *
1333 * Also, if the root will be NFS-mounted, we
1334 * have nowhere to go if DHCP fails. So we
1335 * just have to keep trying forever.
1336 *
1337 * -- Chip
1338 */
1339 #ifdef CONFIG_ROOT_NFS
1340 if (ROOT_DEV == Root_NFS) {
1341 printk(KERN_ERR
1342 "IP-Config: Retrying forever (NFS root)...\n");
1343 goto try_try_again;
1344 }
1345 #endif
1346
1347 if (--retries) {
1348 printk(KERN_ERR
1349 "IP-Config: Reopening network devices...\n");
1350 goto try_try_again;
1351 }
1352
1353 /* Oh, well. At least we tried. */
1354 printk(KERN_ERR "IP-Config: Auto-configuration of network failed.\n");
1355 return -1;
1356 }
1357 #else /* !DYNAMIC */
1358 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
1359 ic_close_devs();
1360 return -1;
1361 #endif /* IPCONFIG_DYNAMIC */
1362 } else {
1363 /* Device selected manually or only one device -> use it */
1364 ic_dev = ic_first_dev->dev;
1365 }
1366
1367 addr = root_nfs_parse_addr(root_server_path);
1368 if (root_server_addr == NONE)
1369 root_server_addr = addr;
1370
1371 /*
1372 * Use defaults whereever applicable.
1373 */
1374 if (ic_defaults() < 0)
1375 return -1;
1376
1377 /*
1378 * Close all network devices except the device we've
1379 * autoconfigured and set up routes.
1380 */
1381 ic_close_devs();
1382 if (ic_setup_if() < 0 || ic_setup_routes() < 0)
1383 return -1;
1384
1385 /*
1386 * Record which protocol was actually used.
1387 */
1388 #ifdef IPCONFIG_DYNAMIC
1389 ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP);
1390 #endif
1391
1392 #ifndef IPCONFIG_SILENT
1393 /*
1394 * Clue in the operator.
1395 */
1396 printk("IP-Config: Complete:");
1397 printk("\n device=%s", ic_dev->name);
1398 printk(", addr=%pI4", &ic_myaddr);
1399 printk(", mask=%pI4", &ic_netmask);
1400 printk(", gw=%pI4", &ic_gateway);
1401 printk(",\n host=%s, domain=%s, nis-domain=%s",
1402 utsname()->nodename, ic_domain, utsname()->domainname);
1403 printk(",\n bootserver=%pI4", &ic_servaddr);
1404 printk(", rootserver=%pI4", &root_server_addr);
1405 printk(", rootpath=%s", root_server_path);
1406 printk("\n");
1407 #endif /* !SILENT */
1408
1409 return 0;
1410 }
1411
1412 late_initcall(ip_auto_config);
1413
1414
1415 /*
1416 * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
1417 * command line parameter. See Documentation/filesystems/nfsroot.txt.
1418 */
1419 static int __init ic_proto_name(char *name)
1420 {
1421 if (!strcmp(name, "on") || !strcmp(name, "any")) {
1422 return 1;
1423 }
1424 if (!strcmp(name, "off") || !strcmp(name, "none")) {
1425 return 0;
1426 }
1427 #ifdef CONFIG_IP_PNP_DHCP
1428 else if (!strcmp(name, "dhcp")) {
1429 ic_proto_enabled &= ~IC_RARP;
1430 return 1;
1431 }
1432 #endif
1433 #ifdef CONFIG_IP_PNP_BOOTP
1434 else if (!strcmp(name, "bootp")) {
1435 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP);
1436 return 1;
1437 }
1438 #endif
1439 #ifdef CONFIG_IP_PNP_RARP
1440 else if (!strcmp(name, "rarp")) {
1441 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP);
1442 return 1;
1443 }
1444 #endif
1445 #ifdef IPCONFIG_DYNAMIC
1446 else if (!strcmp(name, "both")) {
1447 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */
1448 return 1;
1449 }
1450 #endif
1451 return 0;
1452 }
1453
1454 static int __init ip_auto_config_setup(char *addrs)
1455 {
1456 char *cp, *ip, *dp;
1457 int num = 0;
1458
1459 ic_set_manually = 1;
1460 ic_enable = 1;
1461
1462 /*
1463 * If any dhcp, bootp etc options are set, leave autoconfig on
1464 * and skip the below static IP processing.
1465 */
1466 if (ic_proto_name(addrs))
1467 return 1;
1468
1469 /* If no static IP is given, turn off autoconfig and bail. */
1470 if (*addrs == 0 ||
1471 strcmp(addrs, "off") == 0 ||
1472 strcmp(addrs, "none") == 0) {
1473 ic_enable = 0;
1474 return 1;
1475 }
1476
1477 /* Parse string for static IP assignment. */
1478 ip = addrs;
1479 while (ip && *ip) {
1480 if ((cp = strchr(ip, ':')))
1481 *cp++ = '\0';
1482 if (strlen(ip) > 0) {
1483 DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip));
1484 switch (num) {
1485 case 0:
1486 if ((ic_myaddr = in_aton(ip)) == ANY)
1487 ic_myaddr = NONE;
1488 break;
1489 case 1:
1490 if ((ic_servaddr = in_aton(ip)) == ANY)
1491 ic_servaddr = NONE;
1492 break;
1493 case 2:
1494 if ((ic_gateway = in_aton(ip)) == ANY)
1495 ic_gateway = NONE;
1496 break;
1497 case 3:
1498 if ((ic_netmask = in_aton(ip)) == ANY)
1499 ic_netmask = NONE;
1500 break;
1501 case 4:
1502 if ((dp = strchr(ip, '.'))) {
1503 *dp++ = '\0';
1504 strlcpy(utsname()->domainname, dp,
1505 sizeof(utsname()->domainname));
1506 }
1507 strlcpy(utsname()->nodename, ip,
1508 sizeof(utsname()->nodename));
1509 ic_host_name_set = 1;
1510 break;
1511 case 5:
1512 strlcpy(user_dev_name, ip, sizeof(user_dev_name));
1513 break;
1514 case 6:
1515 if (ic_proto_name(ip) == 0 &&
1516 ic_myaddr == NONE) {
1517 ic_enable = 0;
1518 }
1519 break;
1520 }
1521 }
1522 ip = cp;
1523 num++;
1524 }
1525
1526 return 1;
1527 }
1528
1529 static int __init nfsaddrs_config_setup(char *addrs)
1530 {
1531 return ip_auto_config_setup(addrs);
1532 }
1533
1534 static int __init vendor_class_identifier_setup(char *addrs)
1535 {
1536 if (strlcpy(vendor_class_identifier, addrs,
1537 sizeof(vendor_class_identifier))
1538 >= sizeof(vendor_class_identifier))
1539 printk(KERN_WARNING "DHCP: vendorclass too long, truncated to \"%s\"",
1540 vendor_class_identifier);
1541 return 1;
1542 }
1543
1544 __setup("ip=", ip_auto_config_setup);
1545 __setup("nfsaddrs=", nfsaddrs_config_setup);
1546 __setup("dhcpclass=", vendor_class_identifier_setup);
Support for the Chinese Samsung S3C2440 based development boards