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Linux 2.6.17.7
[linux/fpc-iii.git] / net / ipv4 / ipconfig.c
blobcb8a92f18ef6e4be2ec561f1a91af9ddcf0b5281
1 /*
2 * $Id: ipconfig.c,v 1.46 2002/02/01 22:01:04 davem Exp $
3 *
4 * Automatic Configuration of IP -- use DHCP, BOOTP, RARP, or
5 * user-supplied information to configure own IP address and routes.
6 *
7 * Copyright (C) 1996-1998 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
8 *
9 * Derived from network configuration code in fs/nfs/nfsroot.c,
10 * originally Copyright (C) 1995, 1996 Gero Kuhlmann and me.
11 *
12 * BOOTP rewritten to construct and analyse packets itself instead
13 * of misusing the IP layer. num_bugs_causing_wrong_arp_replies--;
14 * -- MJ, December 1998
15 *
16 * Fixed ip_auto_config_setup calling at startup in the new "Linker Magic"
17 * initialization scheme.
18 * - Arnaldo Carvalho de Melo <acme@conectiva.com.br>, 08/11/1999
19 *
20 * DHCP support added. To users this looks like a whole separate
21 * protocol, but we know it's just a bag on the side of BOOTP.
22 * -- Chip Salzenberg <chip@valinux.com>, May 2000
23 *
24 * Ported DHCP support from 2.2.16 to 2.4.0-test4
25 * -- Eric Biederman <ebiederman@lnxi.com>, 30 Aug 2000
26 *
27 * Merged changes from 2.2.19 into 2.4.3
28 * -- Eric Biederman <ebiederman@lnxi.com>, 22 April Aug 2001
29 *
30 * Multiple Nameservers in /proc/net/pnp
31 * -- Josef Siemes <jsiemes@web.de>, Aug 2002
32 */
33
34 #include <linux/config.h>
35 #include <linux/types.h>
36 #include <linux/string.h>
37 #include <linux/kernel.h>
38 #include <linux/jiffies.h>
39 #include <linux/random.h>
40 #include <linux/init.h>
41 #include <linux/utsname.h>
42 #include <linux/in.h>
43 #include <linux/if.h>
44 #include <linux/inet.h>
45 #include <linux/inetdevice.h>
46 #include <linux/netdevice.h>
47 #include <linux/if_arp.h>
48 #include <linux/skbuff.h>
49 #include <linux/ip.h>
50 #include <linux/socket.h>
51 #include <linux/route.h>
52 #include <linux/udp.h>
53 #include <linux/proc_fs.h>
54 #include <linux/seq_file.h>
55 #include <linux/major.h>
56 #include <linux/root_dev.h>
57 #include <linux/delay.h>
58 #include <linux/nfs_fs.h>
59 #include <net/arp.h>
60 #include <net/ip.h>
61 #include <net/ipconfig.h>
62 #include <net/route.h>
63
64 #include <asm/uaccess.h>
65 #include <net/checksum.h>
66 #include <asm/processor.h>
67
68 /* Define this to allow debugging output */
69 #undef IPCONFIG_DEBUG
70
71 #ifdef IPCONFIG_DEBUG
72 #define DBG(x) printk x
73 #else
74 #define DBG(x) do { } while(0)
75 #endif
76
77 #if defined(CONFIG_IP_PNP_DHCP)
78 #define IPCONFIG_DHCP
79 #endif
80 #if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_DHCP)
81 #define IPCONFIG_BOOTP
82 #endif
83 #if defined(CONFIG_IP_PNP_RARP)
84 #define IPCONFIG_RARP
85 #endif
86 #if defined(IPCONFIG_BOOTP) || defined(IPCONFIG_RARP)
87 #define IPCONFIG_DYNAMIC
88 #endif
89
90 /* Define the friendly delay before and after opening net devices */
91 #define CONF_PRE_OPEN 500 /* Before opening: 1/2 second */
92 #define CONF_POST_OPEN 1 /* After opening: 1 second */
93
94 /* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */
95 #define CONF_OPEN_RETRIES 2 /* (Re)open devices twice */
96 #define CONF_SEND_RETRIES 6 /* Send six requests per open */
97 #define CONF_INTER_TIMEOUT (HZ/2) /* Inter-device timeout: 1/2 second */
98 #define CONF_BASE_TIMEOUT (HZ*2) /* Initial timeout: 2 seconds */
99 #define CONF_TIMEOUT_RANDOM (HZ) /* Maximum amount of randomization */
100 #define CONF_TIMEOUT_MULT *7/4 /* Rate of timeout growth */
101 #define CONF_TIMEOUT_MAX (HZ*30) /* Maximum allowed timeout */
102 #define CONF_NAMESERVERS_MAX 3 /* Maximum number of nameservers
103 - '3' from resolv.h */
104
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 u32 ic_myaddr = INADDR_NONE; /* My IP address */
134 static u32 ic_netmask = INADDR_NONE; /* Netmask for local subnet */
135 u32 ic_gateway = INADDR_NONE; /* Gateway IP address */
136
137 u32 ic_servaddr = INADDR_NONE; /* Boot server IP address */
138
139 u32 root_server_addr = INADDR_NONE; /* Address of NFS server */
140 u8 root_server_path[256] = { 0, }; /* Path to mount as root */
141
142 /* Persistent data: */
143
144 static int ic_proto_used; /* Protocol used, if any */
145 static u32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */
146 static u8 ic_domain[64]; /* DNS (not NIS) domain name */
147
148 /*
149 * Private state.
150 */
151
152 /* Name of user-selected boot device */
153 static char user_dev_name[IFNAMSIZ] __initdata = { 0, };
154
155 /* Protocols supported by available interfaces */
156 static int ic_proto_have_if __initdata = 0;
157
158 #ifdef IPCONFIG_DYNAMIC
159 static DEFINE_SPINLOCK(ic_recv_lock);
160 static volatile int ic_got_reply __initdata = 0; /* Proto(s) that replied */
161 #endif
162 #ifdef IPCONFIG_DHCP
163 static int ic_dhcp_msgtype __initdata = 0; /* DHCP msg type received */
164 #endif
165
166
167 /*
168 * Network devices
169 */
170
171 struct ic_device {
172 struct ic_device *next;
173 struct net_device *dev;
174 unsigned short flags;
175 short able;
176 u32 xid;
177 };
178
179 static struct ic_device *ic_first_dev __initdata = NULL;/* List of open device */
180 static struct net_device *ic_dev __initdata = NULL; /* Selected device */
181
182 static int __init ic_open_devs(void)
183 {
184 struct ic_device *d, **last;
185 struct net_device *dev;
186 unsigned short oflags;
187
188 last = &ic_first_dev;
189 rtnl_lock();
190
191 /* bring loopback device up first */
192 if (dev_change_flags(&loopback_dev, loopback_dev.flags | IFF_UP) < 0)
193 printk(KERN_ERR "IP-Config: Failed to open %s\n", loopback_dev.name);
194
195 for (dev = dev_base; dev; dev = dev->next) {
196 if (dev == &loopback_dev)
197 continue;
198 if (user_dev_name[0] ? !strcmp(dev->name, user_dev_name) :
199 (!(dev->flags & IFF_LOOPBACK) &&
200 (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) &&
201 strncmp(dev->name, "dummy", 5))) {
202 int able = 0;
203 if (dev->mtu >= 364)
204 able |= IC_BOOTP;
205 else
206 printk(KERN_WARNING "DHCP/BOOTP: Ignoring device %s, MTU %d too small", dev->name, dev->mtu);
207 if (!(dev->flags & IFF_NOARP))
208 able |= IC_RARP;
209 able &= ic_proto_enabled;
210 if (ic_proto_enabled && !able)
211 continue;
212 oflags = dev->flags;
213 if (dev_change_flags(dev, oflags | IFF_UP) < 0) {
214 printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name);
215 continue;
216 }
217 if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) {
218 rtnl_unlock();
219 return -1;
220 }
221 d->dev = dev;
222 *last = d;
223 last = &d->next;
224 d->flags = oflags;
225 d->able = able;
226 if (able & IC_BOOTP)
227 get_random_bytes(&d->xid, sizeof(u32));
228 else
229 d->xid = 0;
230 ic_proto_have_if |= able;
231 DBG(("IP-Config: %s UP (able=%d, xid=%08x)\n",
232 dev->name, able, d->xid));
233 }
234 }
235 rtnl_unlock();
236
237 *last = NULL;
238
239 if (!ic_first_dev) {
240 if (user_dev_name[0])
241 printk(KERN_ERR "IP-Config: Device `%s' not found.\n", user_dev_name);
242 else
243 printk(KERN_ERR "IP-Config: No network devices available.\n");
244 return -1;
245 }
246 return 0;
247 }
248
249 static void __init ic_close_devs(void)
250 {
251 struct ic_device *d, *next;
252 struct net_device *dev;
253
254 rtnl_lock();
255 next = ic_first_dev;
256 while ((d = next)) {
257 next = d->next;
258 dev = d->dev;
259 if (dev != ic_dev) {
260 DBG(("IP-Config: Downing %s\n", dev->name));
261 dev_change_flags(dev, d->flags);
262 }
263 kfree(d);
264 }
265 rtnl_unlock();
266 }
267
268 /*
269 * Interface to various network functions.
270 */
271
272 static inline void
273 set_sockaddr(struct sockaddr_in *sin, u32 addr, u16 port)
274 {
275 sin->sin_family = AF_INET;
276 sin->sin_addr.s_addr = addr;
277 sin->sin_port = port;
278 }
279
280 static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg)
281 {
282 int res;
283
284 mm_segment_t oldfs = get_fs();
285 set_fs(get_ds());
286 res = devinet_ioctl(cmd, (struct ifreq __user *) arg);
287 set_fs(oldfs);
288 return res;
289 }
290
291 static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg)
292 {
293 int res;
294
295 mm_segment_t oldfs = get_fs();
296 set_fs(get_ds());
297 res = ip_rt_ioctl(cmd, (void __user *) arg);
298 set_fs(oldfs);
299 return res;
300 }
301
302 /*
303 * Set up interface addresses and routes.
304 */
305
306 static int __init ic_setup_if(void)
307 {
308 struct ifreq ir;
309 struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr;
310 int err;
311
312 memset(&ir, 0, sizeof(ir));
313 strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name);
314 set_sockaddr(sin, ic_myaddr, 0);
315 if ((err = ic_dev_ioctl(SIOCSIFADDR, &ir)) < 0) {
316 printk(KERN_ERR "IP-Config: Unable to set interface address (%d).\n", err);
317 return -1;
318 }
319 set_sockaddr(sin, ic_netmask, 0);
320 if ((err = ic_dev_ioctl(SIOCSIFNETMASK, &ir)) < 0) {
321 printk(KERN_ERR "IP-Config: Unable to set interface netmask (%d).\n", err);
322 return -1;
323 }
324 set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0);
325 if ((err = ic_dev_ioctl(SIOCSIFBRDADDR, &ir)) < 0) {
326 printk(KERN_ERR "IP-Config: Unable to set interface broadcast address (%d).\n", err);
327 return -1;
328 }
329 return 0;
330 }
331
332 static int __init ic_setup_routes(void)
333 {
334 /* No need to setup device routes, only the default route... */
335
336 if (ic_gateway != INADDR_NONE) {
337 struct rtentry rm;
338 int err;
339
340 memset(&rm, 0, sizeof(rm));
341 if ((ic_gateway ^ ic_myaddr) & ic_netmask) {
342 printk(KERN_ERR "IP-Config: Gateway not on directly connected network.\n");
343 return -1;
344 }
345 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0);
346 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0);
347 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0);
348 rm.rt_flags = RTF_UP | RTF_GATEWAY;
349 if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) {
350 printk(KERN_ERR "IP-Config: Cannot add default route (%d).\n", err);
351 return -1;
352 }
353 }
354
355 return 0;
356 }
357
358 /*
359 * Fill in default values for all missing parameters.
360 */
361
362 static int __init ic_defaults(void)
363 {
364 /*
365 * At this point we have no userspace running so need not
366 * claim locks on system_utsname
367 */
368
369 if (!ic_host_name_set)
370 sprintf(system_utsname.nodename, "%u.%u.%u.%u", NIPQUAD(ic_myaddr));
371
372 if (root_server_addr == INADDR_NONE)
373 root_server_addr = ic_servaddr;
374
375 if (ic_netmask == INADDR_NONE) {
376 if (IN_CLASSA(ntohl(ic_myaddr)))
377 ic_netmask = htonl(IN_CLASSA_NET);
378 else if (IN_CLASSB(ntohl(ic_myaddr)))
379 ic_netmask = htonl(IN_CLASSB_NET);
380 else if (IN_CLASSC(ntohl(ic_myaddr)))
381 ic_netmask = htonl(IN_CLASSC_NET);
382 else {
383 printk(KERN_ERR "IP-Config: Unable to guess netmask for address %u.%u.%u.%u\n",
384 NIPQUAD(ic_myaddr));
385 return -1;
386 }
387 printk("IP-Config: Guessing netmask %u.%u.%u.%u\n", NIPQUAD(ic_netmask));
388 }
389
390 return 0;
391 }
392
393 /*
394 * RARP support.
395 */
396
397 #ifdef IPCONFIG_RARP
398
399 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
400
401 static struct packet_type rarp_packet_type __initdata = {
402 .type = __constant_htons(ETH_P_RARP),
403 .func = ic_rarp_recv,
404 };
405
406 static inline void ic_rarp_init(void)
407 {
408 dev_add_pack(&rarp_packet_type);
409 }
410
411 static inline void ic_rarp_cleanup(void)
412 {
413 dev_remove_pack(&rarp_packet_type);
414 }
415
416 /*
417 * Process received RARP packet.
418 */
419 static int __init
420 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
421 {
422 struct arphdr *rarp;
423 unsigned char *rarp_ptr;
424 unsigned long sip, tip;
425 unsigned char *sha, *tha; /* s for "source", t for "target" */
426 struct ic_device *d;
427
428 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
429 return NET_RX_DROP;
430
431 if (!pskb_may_pull(skb, sizeof(struct arphdr)))
432 goto drop;
433
434 /* Basic sanity checks can be done without the lock. */
435 rarp = (struct arphdr *)skb->h.raw;
436
437 /* If this test doesn't pass, it's not IP, or we should
438 * ignore it anyway.
439 */
440 if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd))
441 goto drop;
442
443 /* If it's not a RARP reply, delete it. */
444 if (rarp->ar_op != htons(ARPOP_RREPLY))
445 goto drop;
446
447 /* If it's not Ethernet, delete it. */
448 if (rarp->ar_pro != htons(ETH_P_IP))
449 goto drop;
450
451 if (!pskb_may_pull(skb,
452 sizeof(struct arphdr) +
453 (2 * dev->addr_len) +
454 (2 * 4)))
455 goto drop;
456
457 /* OK, it is all there and looks valid, process... */
458 rarp = (struct arphdr *)skb->h.raw;
459 rarp_ptr = (unsigned char *) (rarp + 1);
460
461 /* One reply at a time, please. */
462 spin_lock(&ic_recv_lock);
463
464 /* If we already have a reply, just drop the packet */
465 if (ic_got_reply)
466 goto drop_unlock;
467
468 /* Find the ic_device that the packet arrived on */
469 d = ic_first_dev;
470 while (d && d->dev != dev)
471 d = d->next;
472 if (!d)
473 goto drop_unlock; /* should never happen */
474
475 /* Extract variable-width fields */
476 sha = rarp_ptr;
477 rarp_ptr += dev->addr_len;
478 memcpy(&sip, rarp_ptr, 4);
479 rarp_ptr += 4;
480 tha = rarp_ptr;
481 rarp_ptr += dev->addr_len;
482 memcpy(&tip, rarp_ptr, 4);
483
484 /* Discard packets which are not meant for us. */
485 if (memcmp(tha, dev->dev_addr, dev->addr_len))
486 goto drop_unlock;
487
488 /* Discard packets which are not from specified server. */
489 if (ic_servaddr != INADDR_NONE && ic_servaddr != sip)
490 goto drop_unlock;
491
492 /* We have a winner! */
493 ic_dev = dev;
494 if (ic_myaddr == INADDR_NONE)
495 ic_myaddr = tip;
496 ic_servaddr = sip;
497 ic_got_reply = IC_RARP;
498
499 drop_unlock:
500 /* Show's over. Nothing to see here. */
501 spin_unlock(&ic_recv_lock);
502
503 drop:
504 /* Throw the packet out. */
505 kfree_skb(skb);
506 return 0;
507 }
508
509
510 /*
511 * Send RARP request packet over a single interface.
512 */
513 static void __init ic_rarp_send_if(struct ic_device *d)
514 {
515 struct net_device *dev = d->dev;
516 arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL,
517 dev->dev_addr, dev->dev_addr);
518 }
519 #endif
520
521 /*
522 * DHCP/BOOTP support.
523 */
524
525 #ifdef IPCONFIG_BOOTP
526
527 struct bootp_pkt { /* BOOTP packet format */
528 struct iphdr iph; /* IP header */
529 struct udphdr udph; /* UDP header */
530 u8 op; /* 1=request, 2=reply */
531 u8 htype; /* HW address type */
532 u8 hlen; /* HW address length */
533 u8 hops; /* Used only by gateways */
534 u32 xid; /* Transaction ID */
535 u16 secs; /* Seconds since we started */
536 u16 flags; /* Just what it says */
537 u32 client_ip; /* Client's IP address if known */
538 u32 your_ip; /* Assigned IP address */
539 u32 server_ip; /* (Next, e.g. NFS) Server's IP address */
540 u32 relay_ip; /* IP address of BOOTP relay */
541 u8 hw_addr[16]; /* Client's HW address */
542 u8 serv_name[64]; /* Server host name */
543 u8 boot_file[128]; /* Name of boot file */
544 u8 exten[312]; /* DHCP options / BOOTP vendor extensions */
545 };
546
547 /* packet ops */
548 #define BOOTP_REQUEST 1
549 #define BOOTP_REPLY 2
550
551 /* DHCP message types */
552 #define DHCPDISCOVER 1
553 #define DHCPOFFER 2
554 #define DHCPREQUEST 3
555 #define DHCPDECLINE 4
556 #define DHCPACK 5
557 #define DHCPNAK 6
558 #define DHCPRELEASE 7
559 #define DHCPINFORM 8
560
561 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
562
563 static struct packet_type bootp_packet_type __initdata = {
564 .type = __constant_htons(ETH_P_IP),
565 .func = ic_bootp_recv,
566 };
567
568
569 /*
570 * Initialize DHCP/BOOTP extension fields in the request.
571 */
572
573 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 };
574
575 #ifdef IPCONFIG_DHCP
576
577 static void __init
578 ic_dhcp_init_options(u8 *options)
579 {
580 u8 mt = ((ic_servaddr == INADDR_NONE)
581 ? DHCPDISCOVER : DHCPREQUEST);
582 u8 *e = options;
583
584 #ifdef IPCONFIG_DEBUG
585 printk("DHCP: Sending message type %d\n", mt);
586 #endif
587
588 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */
589 e += 4;
590
591 *e++ = 53; /* DHCP message type */
592 *e++ = 1;
593 *e++ = mt;
594
595 if (mt == DHCPREQUEST) {
596 *e++ = 54; /* Server ID (IP address) */
597 *e++ = 4;
598 memcpy(e, &ic_servaddr, 4);
599 e += 4;
600
601 *e++ = 50; /* Requested IP address */
602 *e++ = 4;
603 memcpy(e, &ic_myaddr, 4);
604 e += 4;
605 }
606
607 /* always? */
608 {
609 static const u8 ic_req_params[] = {
610 1, /* Subnet mask */
611 3, /* Default gateway */
612 6, /* DNS server */
613 12, /* Host name */
614 15, /* Domain name */
615 17, /* Boot path */
616 40, /* NIS domain name */
617 };
618
619 *e++ = 55; /* Parameter request list */
620 *e++ = sizeof(ic_req_params);
621 memcpy(e, ic_req_params, sizeof(ic_req_params));
622 e += sizeof(ic_req_params);
623 }
624
625 *e++ = 255; /* End of the list */
626 }
627
628 #endif /* IPCONFIG_DHCP */
629
630 static void __init ic_bootp_init_ext(u8 *e)
631 {
632 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */
633 e += 4;
634 *e++ = 1; /* Subnet mask request */
635 *e++ = 4;
636 e += 4;
637 *e++ = 3; /* Default gateway request */
638 *e++ = 4;
639 e += 4;
640 *e++ = 5; /* Name server request */
641 *e++ = 8;
642 e += 8;
643 *e++ = 12; /* Host name request */
644 *e++ = 32;
645 e += 32;
646 *e++ = 40; /* NIS Domain name request */
647 *e++ = 32;
648 e += 32;
649 *e++ = 17; /* Boot path */
650 *e++ = 40;
651 e += 40;
652
653 *e++ = 57; /* set extension buffer size for reply */
654 *e++ = 2;
655 *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */
656 *e++ = 150;
657
658 *e++ = 255; /* End of the list */
659 }
660
661
662 /*
663 * Initialize the DHCP/BOOTP mechanism.
664 */
665 static inline void ic_bootp_init(void)
666 {
667 int i;
668
669 for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
670 ic_nameservers[i] = INADDR_NONE;
671
672 dev_add_pack(&bootp_packet_type);
673 }
674
675
676 /*
677 * DHCP/BOOTP cleanup.
678 */
679 static inline void ic_bootp_cleanup(void)
680 {
681 dev_remove_pack(&bootp_packet_type);
682 }
683
684
685 /*
686 * Send DHCP/BOOTP request to single interface.
687 */
688 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff)
689 {
690 struct net_device *dev = d->dev;
691 struct sk_buff *skb;
692 struct bootp_pkt *b;
693 int hh_len = LL_RESERVED_SPACE(dev);
694 struct iphdr *h;
695
696 /* Allocate packet */
697 skb = alloc_skb(sizeof(struct bootp_pkt) + hh_len + 15, GFP_KERNEL);
698 if (!skb)
699 return;
700 skb_reserve(skb, hh_len);
701 b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt));
702 memset(b, 0, sizeof(struct bootp_pkt));
703
704 /* Construct IP header */
705 skb->nh.iph = h = &b->iph;
706 h->version = 4;
707 h->ihl = 5;
708 h->tot_len = htons(sizeof(struct bootp_pkt));
709 h->frag_off = htons(IP_DF);
710 h->ttl = 64;
711 h->protocol = IPPROTO_UDP;
712 h->daddr = INADDR_BROADCAST;
713 h->check = ip_fast_csum((unsigned char *) h, h->ihl);
714
715 /* Construct UDP header */
716 b->udph.source = htons(68);
717 b->udph.dest = htons(67);
718 b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr));
719 /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */
720
721 /* Construct DHCP/BOOTP header */
722 b->op = BOOTP_REQUEST;
723 if (dev->type < 256) /* check for false types */
724 b->htype = dev->type;
725 else if (dev->type == ARPHRD_IEEE802_TR) /* fix for token ring */
726 b->htype = ARPHRD_IEEE802;
727 else if (dev->type == ARPHRD_FDDI)
728 b->htype = ARPHRD_ETHER;
729 else {
730 printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name);
731 b->htype = dev->type; /* can cause undefined behavior */
732 }
733 b->hlen = dev->addr_len;
734 b->your_ip = INADDR_NONE;
735 b->server_ip = INADDR_NONE;
736 memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
737 b->secs = htons(jiffies_diff / HZ);
738 b->xid = d->xid;
739
740 /* add DHCP options or BOOTP extensions */
741 #ifdef IPCONFIG_DHCP
742 if (ic_proto_enabled & IC_USE_DHCP)
743 ic_dhcp_init_options(b->exten);
744 else
745 #endif
746 ic_bootp_init_ext(b->exten);
747
748 /* Chain packet down the line... */
749 skb->dev = dev;
750 skb->protocol = htons(ETH_P_IP);
751 if ((dev->hard_header &&
752 dev->hard_header(skb, dev, ntohs(skb->protocol), dev->broadcast, dev->dev_addr, skb->len) < 0) ||
753 dev_queue_xmit(skb) < 0)
754 printk("E");
755 }
756
757
758 /*
759 * Copy BOOTP-supplied string if not already set.
760 */
761 static int __init ic_bootp_string(char *dest, char *src, int len, int max)
762 {
763 if (!len)
764 return 0;
765 if (len > max-1)
766 len = max-1;
767 memcpy(dest, src, len);
768 dest[len] = '\0';
769 return 1;
770 }
771
772
773 /*
774 * Process BOOTP extensions.
775 */
776 static void __init ic_do_bootp_ext(u8 *ext)
777 {
778 u8 servers;
779 int i;
780
781 #ifdef IPCONFIG_DEBUG
782 u8 *c;
783
784 printk("DHCP/BOOTP: Got extension %d:",*ext);
785 for(c=ext+2; c<ext+2+ext[1]; c++)
786 printk(" %02x", *c);
787 printk("\n");
788 #endif
789
790 switch (*ext++) {
791 case 1: /* Subnet mask */
792 if (ic_netmask == INADDR_NONE)
793 memcpy(&ic_netmask, ext+1, 4);
794 break;
795 case 3: /* Default gateway */
796 if (ic_gateway == INADDR_NONE)
797 memcpy(&ic_gateway, ext+1, 4);
798 break;
799 case 6: /* DNS server */
800 servers= *ext/4;
801 if (servers > CONF_NAMESERVERS_MAX)
802 servers = CONF_NAMESERVERS_MAX;
803 for (i = 0; i < servers; i++) {
804 if (ic_nameservers[i] == INADDR_NONE)
805 memcpy(&ic_nameservers[i], ext+1+4*i, 4);
806 }
807 break;
808 case 12: /* Host name */
809 ic_bootp_string(system_utsname.nodename, ext+1, *ext, __NEW_UTS_LEN);
810 ic_host_name_set = 1;
811 break;
812 case 15: /* Domain name (DNS) */
813 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
814 break;
815 case 17: /* Root path */
816 if (!root_server_path[0])
817 ic_bootp_string(root_server_path, ext+1, *ext, sizeof(root_server_path));
818 break;
819 case 40: /* NIS Domain name (_not_ DNS) */
820 ic_bootp_string(system_utsname.domainname, ext+1, *ext, __NEW_UTS_LEN);
821 break;
822 }
823 }
824
825
826 /*
827 * Receive BOOTP reply.
828 */
829 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
830 {
831 struct bootp_pkt *b;
832 struct iphdr *h;
833 struct ic_device *d;
834 int len, ext_len;
835
836 /* Perform verifications before taking the lock. */
837 if (skb->pkt_type == PACKET_OTHERHOST)
838 goto drop;
839
840 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
841 return NET_RX_DROP;
842
843 if (!pskb_may_pull(skb,
844 sizeof(struct iphdr) +
845 sizeof(struct udphdr)))
846 goto drop;
847
848 b = (struct bootp_pkt *) skb->nh.iph;
849 h = &b->iph;
850
851 if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP)
852 goto drop;
853
854 /* Fragments are not supported */
855 if (h->frag_off & htons(IP_OFFSET | IP_MF)) {
856 if (net_ratelimit())
857 printk(KERN_ERR "DHCP/BOOTP: Ignoring fragmented "
858 "reply.\n");
859 goto drop;
860 }
861
862 if (skb->len < ntohs(h->tot_len))
863 goto drop;
864
865 if (ip_fast_csum((char *) h, h->ihl))
866 goto drop;
867
868 if (b->udph.source != htons(67) || b->udph.dest != htons(68))
869 goto drop;
870
871 if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
872 goto drop;
873
874 len = ntohs(b->udph.len) - sizeof(struct udphdr);
875 ext_len = len - (sizeof(*b) -
876 sizeof(struct iphdr) -
877 sizeof(struct udphdr) -
878 sizeof(b->exten));
879 if (ext_len < 0)
880 goto drop;
881
882 /* Ok the front looks good, make sure we can get at the rest. */
883 if (!pskb_may_pull(skb, skb->len))
884 goto drop;
885
886 b = (struct bootp_pkt *) skb->nh.iph;
887 h = &b->iph;
888
889 /* One reply at a time, please. */
890 spin_lock(&ic_recv_lock);
891
892 /* If we already have a reply, just drop the packet */
893 if (ic_got_reply)
894 goto drop_unlock;
895
896 /* Find the ic_device that the packet arrived on */
897 d = ic_first_dev;
898 while (d && d->dev != dev)
899 d = d->next;
900 if (!d)
901 goto drop_unlock; /* should never happen */
902
903 /* Is it a reply to our BOOTP request? */
904 if (b->op != BOOTP_REPLY ||
905 b->xid != d->xid) {
906 if (net_ratelimit())
907 printk(KERN_ERR "DHCP/BOOTP: Reply not for us, "
908 "op[%x] xid[%x]\n",
909 b->op, b->xid);
910 goto drop_unlock;
911 }
912
913 /* Parse extensions */
914 if (ext_len >= 4 &&
915 !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */
916 u8 *end = (u8 *) b + ntohs(b->iph.tot_len);
917 u8 *ext;
918
919 #ifdef IPCONFIG_DHCP
920 if (ic_proto_enabled & IC_USE_DHCP) {
921 u32 server_id = INADDR_NONE;
922 int mt = 0;
923
924 ext = &b->exten[4];
925 while (ext < end && *ext != 0xff) {
926 u8 *opt = ext++;
927 if (*opt == 0) /* Padding */
928 continue;
929 ext += *ext + 1;
930 if (ext >= end)
931 break;
932 switch (*opt) {
933 case 53: /* Message type */
934 if (opt[1])
935 mt = opt[2];
936 break;
937 case 54: /* Server ID (IP address) */
938 if (opt[1] >= 4)
939 memcpy(&server_id, opt + 2, 4);
940 break;
941 };
942 }
943
944 #ifdef IPCONFIG_DEBUG
945 printk("DHCP: Got message type %d\n", mt);
946 #endif
947
948 switch (mt) {
949 case DHCPOFFER:
950 /* While in the process of accepting one offer,
951 * ignore all others.
952 */
953 if (ic_myaddr != INADDR_NONE)
954 goto drop_unlock;
955
956 /* Let's accept that offer. */
957 ic_myaddr = b->your_ip;
958 ic_servaddr = server_id;
959 #ifdef IPCONFIG_DEBUG
960 printk("DHCP: Offered address %u.%u.%u.%u",
961 NIPQUAD(ic_myaddr));
962 printk(" by server %u.%u.%u.%u\n",
963 NIPQUAD(ic_servaddr));
964 #endif
965 /* The DHCP indicated server address takes
966 * precedence over the bootp header one if
967 * they are different.
968 */
969 if ((server_id != INADDR_NONE) &&
970 (b->server_ip != server_id))
971 b->server_ip = ic_servaddr;
972 break;
973
974 case DHCPACK:
975 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0)
976 goto drop_unlock;
977
978 /* Yeah! */
979 break;
980
981 default:
982 /* Urque. Forget it*/
983 ic_myaddr = INADDR_NONE;
984 ic_servaddr = INADDR_NONE;
985 goto drop_unlock;
986 };
987
988 ic_dhcp_msgtype = mt;
989
990 }
991 #endif /* IPCONFIG_DHCP */
992
993 ext = &b->exten[4];
994 while (ext < end && *ext != 0xff) {
995 u8 *opt = ext++;
996 if (*opt == 0) /* Padding */
997 continue;
998 ext += *ext + 1;
999 if (ext < end)
1000 ic_do_bootp_ext(opt);
1001 }
1002 }
1003
1004 /* We have a winner! */
1005 ic_dev = dev;
1006 ic_myaddr = b->your_ip;
1007 ic_servaddr = b->server_ip;
1008 if (ic_gateway == INADDR_NONE && b->relay_ip)
1009 ic_gateway = b->relay_ip;
1010 if (ic_nameservers[0] == INADDR_NONE)
1011 ic_nameservers[0] = ic_servaddr;
1012 ic_got_reply = IC_BOOTP;
1013
1014 drop_unlock:
1015 /* Show's over. Nothing to see here. */
1016 spin_unlock(&ic_recv_lock);
1017
1018 drop:
1019 /* Throw the packet out. */
1020 kfree_skb(skb);
1021
1022 return 0;
1023 }
1024
1025
1026 #endif
1027
1028
1029 /*
1030 * Dynamic IP configuration -- DHCP, BOOTP, RARP.
1031 */
1032
1033 #ifdef IPCONFIG_DYNAMIC
1034
1035 static int __init ic_dynamic(void)
1036 {
1037 int retries;
1038 struct ic_device *d;
1039 unsigned long start_jiffies, timeout, jiff;
1040 int do_bootp = ic_proto_have_if & IC_BOOTP;
1041 int do_rarp = ic_proto_have_if & IC_RARP;
1042
1043 /*
1044 * If none of DHCP/BOOTP/RARP was selected, return with an error.
1045 * This routine gets only called when some pieces of information
1046 * are missing, and without DHCP/BOOTP/RARP we are unable to get it.
1047 */
1048 if (!ic_proto_enabled) {
1049 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
1050 return -1;
1051 }
1052
1053 #ifdef IPCONFIG_BOOTP
1054 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
1055 printk(KERN_ERR "DHCP/BOOTP: No suitable device found.\n");
1056 #endif
1057 #ifdef IPCONFIG_RARP
1058 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)
1059 printk(KERN_ERR "RARP: No suitable device found.\n");
1060 #endif
1061
1062 if (!ic_proto_have_if)
1063 /* Error message already printed */
1064 return -1;
1065
1066 /*
1067 * Setup protocols
1068 */
1069 #ifdef IPCONFIG_BOOTP
1070 if (do_bootp)
1071 ic_bootp_init();
1072 #endif
1073 #ifdef IPCONFIG_RARP
1074 if (do_rarp)
1075 ic_rarp_init();
1076 #endif
1077
1078 /*
1079 * Send requests and wait, until we get an answer. This loop
1080 * seems to be a terrible waste of CPU time, but actually there is
1081 * only one process running at all, so we don't need to use any
1082 * scheduler functions.
1083 * [Actually we could now, but the nothing else running note still
1084 * applies.. - AC]
1085 */
1086 printk(KERN_NOTICE "Sending %s%s%s requests .",
1087 do_bootp
1088 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "",
1089 (do_bootp && do_rarp) ? " and " : "",
1090 do_rarp ? "RARP" : "");
1091
1092 start_jiffies = jiffies;
1093 d = ic_first_dev;
1094 retries = CONF_SEND_RETRIES;
1095 get_random_bytes(&timeout, sizeof(timeout));
1096 timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned) CONF_TIMEOUT_RANDOM);
1097 for(;;) {
1098 #ifdef IPCONFIG_BOOTP
1099 if (do_bootp && (d->able & IC_BOOTP))
1100 ic_bootp_send_if(d, jiffies - start_jiffies);
1101 #endif
1102 #ifdef IPCONFIG_RARP
1103 if (do_rarp && (d->able & IC_RARP))
1104 ic_rarp_send_if(d);
1105 #endif
1106
1107 jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout);
1108 while (time_before(jiffies, jiff) && !ic_got_reply)
1109 schedule_timeout_uninterruptible(1);
1110 #ifdef IPCONFIG_DHCP
1111 /* DHCP isn't done until we get a DHCPACK. */
1112 if ((ic_got_reply & IC_BOOTP)
1113 && (ic_proto_enabled & IC_USE_DHCP)
1114 && ic_dhcp_msgtype != DHCPACK)
1115 {
1116 ic_got_reply = 0;
1117 printk(",");
1118 continue;
1119 }
1120 #endif /* IPCONFIG_DHCP */
1121
1122 if (ic_got_reply) {
1123 printk(" OK\n");
1124 break;
1125 }
1126
1127 if ((d = d->next))
1128 continue;
1129
1130 if (! --retries) {
1131 printk(" timed out!\n");
1132 break;
1133 }
1134
1135 d = ic_first_dev;
1136
1137 timeout = timeout CONF_TIMEOUT_MULT;
1138 if (timeout > CONF_TIMEOUT_MAX)
1139 timeout = CONF_TIMEOUT_MAX;
1140
1141 printk(".");
1142 }
1143
1144 #ifdef IPCONFIG_BOOTP
1145 if (do_bootp)
1146 ic_bootp_cleanup();
1147 #endif
1148 #ifdef IPCONFIG_RARP
1149 if (do_rarp)
1150 ic_rarp_cleanup();
1151 #endif
1152
1153 if (!ic_got_reply) {
1154 ic_myaddr = INADDR_NONE;
1155 return -1;
1156 }
1157
1158 printk("IP-Config: Got %s answer from %u.%u.%u.%u, ",
1159 ((ic_got_reply & IC_RARP) ? "RARP"
1160 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),
1161 NIPQUAD(ic_servaddr));
1162 printk("my address is %u.%u.%u.%u\n", NIPQUAD(ic_myaddr));
1163
1164 return 0;
1165 }
1166
1167 #endif /* IPCONFIG_DYNAMIC */
1168
1169 #ifdef CONFIG_PROC_FS
1170
1171 static int pnp_seq_show(struct seq_file *seq, void *v)
1172 {
1173 int i;
1174
1175 if (ic_proto_used & IC_PROTO)
1176 seq_printf(seq, "#PROTO: %s\n",
1177 (ic_proto_used & IC_RARP) ? "RARP"
1178 : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP");
1179 else
1180 seq_puts(seq, "#MANUAL\n");
1181
1182 if (ic_domain[0])
1183 seq_printf(seq,
1184 "domain %s\n", ic_domain);
1185 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {
1186 if (ic_nameservers[i] != INADDR_NONE)
1187 seq_printf(seq,
1188 "nameserver %u.%u.%u.%u\n",
1189 NIPQUAD(ic_nameservers[i]));
1190 }
1191 if (ic_servaddr != INADDR_NONE)
1192 seq_printf(seq,
1193 "bootserver %u.%u.%u.%u\n",
1194 NIPQUAD(ic_servaddr));
1195 return 0;
1196 }
1197
1198 static int pnp_seq_open(struct inode *indoe, struct file *file)
1199 {
1200 return single_open(file, pnp_seq_show, NULL);
1201 }
1202
1203 static struct file_operations pnp_seq_fops = {
1204 .owner = THIS_MODULE,
1205 .open = pnp_seq_open,
1206 .read = seq_read,
1207 .llseek = seq_lseek,
1208 .release = single_release,
1209 };
1210 #endif /* CONFIG_PROC_FS */
1211
1212 /*
1213 * Extract IP address from the parameter string if needed. Note that we
1214 * need to have root_server_addr set _before_ IPConfig gets called as it
1215 * can override it.
1216 */
1217 u32 __init root_nfs_parse_addr(char *name)
1218 {
1219 u32 addr;
1220 int octets = 0;
1221 char *cp, *cq;
1222
1223 cp = cq = name;
1224 while (octets < 4) {
1225 while (*cp >= '0' && *cp <= '9')
1226 cp++;
1227 if (cp == cq || cp - cq > 3)
1228 break;
1229 if (*cp == '.' || octets == 3)
1230 octets++;
1231 if (octets < 4)
1232 cp++;
1233 cq = cp;
1234 }
1235 if (octets == 4 && (*cp == ':' || *cp == '\0')) {
1236 if (*cp == ':')
1237 *cp++ = '\0';
1238 addr = in_aton(name);
1239 memmove(name, cp, strlen(cp) + 1);
1240 } else
1241 addr = INADDR_NONE;
1242
1243 return addr;
1244 }
1245
1246 /*
1247 * IP Autoconfig dispatcher.
1248 */
1249
1250 static int __init ip_auto_config(void)
1251 {
1252 u32 addr;
1253
1254 #ifdef CONFIG_PROC_FS
1255 proc_net_fops_create("pnp", S_IRUGO, &pnp_seq_fops);
1256 #endif /* CONFIG_PROC_FS */
1257
1258 if (!ic_enable)
1259 return 0;
1260
1261 DBG(("IP-Config: Entered.\n"));
1262 #ifdef IPCONFIG_DYNAMIC
1263 try_try_again:
1264 #endif
1265 /* Give hardware a chance to settle */
1266 msleep(CONF_PRE_OPEN);
1267
1268 /* Setup all network devices */
1269 if (ic_open_devs() < 0)
1270 return -1;
1271
1272 /* Give drivers a chance to settle */
1273 ssleep(CONF_POST_OPEN);
1274
1275 /*
1276 * If the config information is insufficient (e.g., our IP address or
1277 * IP address of the boot server is missing or we have multiple network
1278 * interfaces and no default was set), use BOOTP or RARP to get the
1279 * missing values.
1280 */
1281 if (ic_myaddr == INADDR_NONE ||
1282 #ifdef CONFIG_ROOT_NFS
1283 (MAJOR(ROOT_DEV) == UNNAMED_MAJOR
1284 && root_server_addr == INADDR_NONE
1285 && ic_servaddr == INADDR_NONE) ||
1286 #endif
1287 ic_first_dev->next) {
1288 #ifdef IPCONFIG_DYNAMIC
1289
1290 int retries = CONF_OPEN_RETRIES;
1291
1292 if (ic_dynamic() < 0) {
1293 ic_close_devs();
1294
1295 /*
1296 * I don't know why, but sometimes the
1297 * eepro100 driver (at least) gets upset and
1298 * doesn't work the first time it's opened.
1299 * But then if you close it and reopen it, it
1300 * works just fine. So we need to try that at
1301 * least once before giving up.
1302 *
1303 * Also, if the root will be NFS-mounted, we
1304 * have nowhere to go if DHCP fails. So we
1305 * just have to keep trying forever.
1306 *
1307 * -- Chip
1308 */
1309 #ifdef CONFIG_ROOT_NFS
1310 if (ROOT_DEV == Root_NFS) {
1311 printk(KERN_ERR
1312 "IP-Config: Retrying forever (NFS root)...\n");
1313 goto try_try_again;
1314 }
1315 #endif
1316
1317 if (--retries) {
1318 printk(KERN_ERR
1319 "IP-Config: Reopening network devices...\n");
1320 goto try_try_again;
1321 }
1322
1323 /* Oh, well. At least we tried. */
1324 printk(KERN_ERR "IP-Config: Auto-configuration of network failed.\n");
1325 return -1;
1326 }
1327 #else /* !DYNAMIC */
1328 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
1329 ic_close_devs();
1330 return -1;
1331 #endif /* IPCONFIG_DYNAMIC */
1332 } else {
1333 /* Device selected manually or only one device -> use it */
1334 ic_dev = ic_first_dev->dev;
1335 }
1336
1337 addr = root_nfs_parse_addr(root_server_path);
1338 if (root_server_addr == INADDR_NONE)
1339 root_server_addr = addr;
1340
1341 /*
1342 * Use defaults whereever applicable.
1343 */
1344 if (ic_defaults() < 0)
1345 return -1;
1346
1347 /*
1348 * Close all network devices except the device we've
1349 * autoconfigured and set up routes.
1350 */
1351 ic_close_devs();
1352 if (ic_setup_if() < 0 || ic_setup_routes() < 0)
1353 return -1;
1354
1355 /*
1356 * Record which protocol was actually used.
1357 */
1358 #ifdef IPCONFIG_DYNAMIC
1359 ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP);
1360 #endif
1361
1362 #ifndef IPCONFIG_SILENT
1363 /*
1364 * Clue in the operator.
1365 */
1366 printk("IP-Config: Complete:");
1367 printk("\n device=%s", ic_dev->name);
1368 printk(", addr=%u.%u.%u.%u", NIPQUAD(ic_myaddr));
1369 printk(", mask=%u.%u.%u.%u", NIPQUAD(ic_netmask));
1370 printk(", gw=%u.%u.%u.%u", NIPQUAD(ic_gateway));
1371 printk(",\n host=%s, domain=%s, nis-domain=%s",
1372 system_utsname.nodename, ic_domain, system_utsname.domainname);
1373 printk(",\n bootserver=%u.%u.%u.%u", NIPQUAD(ic_servaddr));
1374 printk(", rootserver=%u.%u.%u.%u", NIPQUAD(root_server_addr));
1375 printk(", rootpath=%s", root_server_path);
1376 printk("\n");
1377 #endif /* !SILENT */
1378
1379 return 0;
1380 }
1381
1382 late_initcall(ip_auto_config);
1383
1384
1385 /*
1386 * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
1387 * command line parameter. It consists of option fields separated by colons in
1388 * the following order:
1389 *
1390 * <client-ip>:<server-ip>:<gw-ip>:<netmask>:<host name>:<device>:<PROTO>
1391 *
1392 * Any of the fields can be empty which means to use a default value:
1393 * <client-ip> - address given by BOOTP or RARP
1394 * <server-ip> - address of host returning BOOTP or RARP packet
1395 * <gw-ip> - none, or the address returned by BOOTP
1396 * <netmask> - automatically determined from <client-ip>, or the
1397 * one returned by BOOTP
1398 * <host name> - <client-ip> in ASCII notation, or the name returned
1399 * by BOOTP
1400 * <device> - use all available devices
1401 * <PROTO>:
1402 * off|none - don't do autoconfig at all (DEFAULT)
1403 * on|any - use any configured protocol
1404 * dhcp|bootp|rarp - use only the specified protocol
1405 * both - use both BOOTP and RARP (not DHCP)
1406 */
1407 static int __init ic_proto_name(char *name)
1408 {
1409 if (!strcmp(name, "on") || !strcmp(name, "any")) {
1410 return 1;
1411 }
1412 #ifdef CONFIG_IP_PNP_DHCP
1413 else if (!strcmp(name, "dhcp")) {
1414 ic_proto_enabled &= ~IC_RARP;
1415 return 1;
1416 }
1417 #endif
1418 #ifdef CONFIG_IP_PNP_BOOTP
1419 else if (!strcmp(name, "bootp")) {
1420 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP);
1421 return 1;
1422 }
1423 #endif
1424 #ifdef CONFIG_IP_PNP_RARP
1425 else if (!strcmp(name, "rarp")) {
1426 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP);
1427 return 1;
1428 }
1429 #endif
1430 #ifdef IPCONFIG_DYNAMIC
1431 else if (!strcmp(name, "both")) {
1432 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */
1433 return 1;
1434 }
1435 #endif
1436 return 0;
1437 }
1438
1439 static int __init ip_auto_config_setup(char *addrs)
1440 {
1441 char *cp, *ip, *dp;
1442 int num = 0;
1443
1444 ic_set_manually = 1;
1445
1446 ic_enable = (*addrs &&
1447 (strcmp(addrs, "off") != 0) &&
1448 (strcmp(addrs, "none") != 0));
1449 if (!ic_enable)
1450 return 1;
1451
1452 if (ic_proto_name(addrs))
1453 return 1;
1454
1455 /* Parse the whole string */
1456 ip = addrs;
1457 while (ip && *ip) {
1458 if ((cp = strchr(ip, ':')))
1459 *cp++ = '\0';
1460 if (strlen(ip) > 0) {
1461 DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip));
1462 switch (num) {
1463 case 0:
1464 if ((ic_myaddr = in_aton(ip)) == INADDR_ANY)
1465 ic_myaddr = INADDR_NONE;
1466 break;
1467 case 1:
1468 if ((ic_servaddr = in_aton(ip)) == INADDR_ANY)
1469 ic_servaddr = INADDR_NONE;
1470 break;
1471 case 2:
1472 if ((ic_gateway = in_aton(ip)) == INADDR_ANY)
1473 ic_gateway = INADDR_NONE;
1474 break;
1475 case 3:
1476 if ((ic_netmask = in_aton(ip)) == INADDR_ANY)
1477 ic_netmask = INADDR_NONE;
1478 break;
1479 case 4:
1480 if ((dp = strchr(ip, '.'))) {
1481 *dp++ = '\0';
1482 strlcpy(system_utsname.domainname, dp,
1483 sizeof(system_utsname.domainname));
1484 }
1485 strlcpy(system_utsname.nodename, ip,
1486 sizeof(system_utsname.nodename));
1487 ic_host_name_set = 1;
1488 break;
1489 case 5:
1490 strlcpy(user_dev_name, ip, sizeof(user_dev_name));
1491 break;
1492 case 6:
1493 ic_proto_name(ip);
1494 break;
1495 }
1496 }
1497 ip = cp;
1498 num++;
1499 }
1500
1501 return 1;
1502 }
1503
1504 static int __init nfsaddrs_config_setup(char *addrs)
1505 {
1506 return ip_auto_config_setup(addrs);
1507 }
1508
1509 __setup("ip=", ip_auto_config_setup);
1510 __setup("nfsaddrs=", nfsaddrs_config_setup);
Linux with added FPC-III support