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Linux-2.6.12-rc2
[linux-2.6/kvm.git] / net / ipv4 / ipconfig.c
blobf2509034ce72bce29573d886f59adda599e7be8e
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/netdevice.h>
46 #include <linux/if_arp.h>
47 #include <linux/skbuff.h>
48 #include <linux/ip.h>
49 #include <linux/socket.h>
50 #include <linux/route.h>
51 #include <linux/udp.h>
52 #include <linux/proc_fs.h>
53 #include <linux/seq_file.h>
54 #include <linux/major.h>
55 #include <linux/root_dev.h>
56 #include <linux/delay.h>
57 #include <net/arp.h>
58 #include <net/ip.h>
59 #include <net/ipconfig.h>
60
61 #include <asm/uaccess.h>
62 #include <net/checksum.h>
63 #include <asm/processor.h>
64
65 /* Define this to allow debugging output */
66 #undef IPCONFIG_DEBUG
67
68 #ifdef IPCONFIG_DEBUG
69 #define DBG(x) printk x
70 #else
71 #define DBG(x) do { } while(0)
72 #endif
73
74 #if defined(CONFIG_IP_PNP_DHCP)
75 #define IPCONFIG_DHCP
76 #endif
77 #if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_DHCP)
78 #define IPCONFIG_BOOTP
79 #endif
80 #if defined(CONFIG_IP_PNP_RARP)
81 #define IPCONFIG_RARP
82 #endif
83 #if defined(IPCONFIG_BOOTP) || defined(IPCONFIG_RARP)
84 #define IPCONFIG_DYNAMIC
85 #endif
86
87 /* Define the friendly delay before and after opening net devices */
88 #define CONF_PRE_OPEN 500 /* Before opening: 1/2 second */
89 #define CONF_POST_OPEN 1 /* After opening: 1 second */
90
91 /* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */
92 #define CONF_OPEN_RETRIES 2 /* (Re)open devices twice */
93 #define CONF_SEND_RETRIES 6 /* Send six requests per open */
94 #define CONF_INTER_TIMEOUT (HZ/2) /* Inter-device timeout: 1/2 second */
95 #define CONF_BASE_TIMEOUT (HZ*2) /* Initial timeout: 2 seconds */
96 #define CONF_TIMEOUT_RANDOM (HZ) /* Maximum amount of randomization */
97 #define CONF_TIMEOUT_MULT *7/4 /* Rate of timeout growth */
98 #define CONF_TIMEOUT_MAX (HZ*30) /* Maximum allowed timeout */
99 #define CONF_NAMESERVERS_MAX 3 /* Maximum number of nameservers
100 - '3' from resolv.h */
101
102
103 /*
104 * Public IP configuration
105 */
106
107 /* This is used by platforms which might be able to set the ipconfig
108 * variables using firmware environment vars. If this is set, it will
109 * ignore such firmware variables.
110 */
111 int ic_set_manually __initdata = 0; /* IPconfig parameters set manually */
112
113 static int ic_enable __initdata = 0; /* IP config enabled? */
114
115 /* Protocol choice */
116 int ic_proto_enabled __initdata = 0
117 #ifdef IPCONFIG_BOOTP
118 | IC_BOOTP
119 #endif
120 #ifdef CONFIG_IP_PNP_DHCP
121 | IC_USE_DHCP
122 #endif
123 #ifdef IPCONFIG_RARP
124 | IC_RARP
125 #endif
126 ;
127
128 static int ic_host_name_set __initdata = 0; /* Host name set by us? */
129
130 u32 ic_myaddr = INADDR_NONE; /* My IP address */
131 static u32 ic_netmask = INADDR_NONE; /* Netmask for local subnet */
132 u32 ic_gateway = INADDR_NONE; /* Gateway IP address */
133
134 u32 ic_servaddr = INADDR_NONE; /* Boot server IP address */
135
136 u32 root_server_addr = INADDR_NONE; /* Address of NFS server */
137 u8 root_server_path[256] = { 0, }; /* Path to mount as root */
138
139 /* Persistent data: */
140
141 static int ic_proto_used; /* Protocol used, if any */
142 static u32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */
143 static u8 ic_domain[64]; /* DNS (not NIS) domain name */
144
145 /*
146 * Private state.
147 */
148
149 /* Name of user-selected boot device */
150 static char user_dev_name[IFNAMSIZ] __initdata = { 0, };
151
152 /* Protocols supported by available interfaces */
153 static int ic_proto_have_if __initdata = 0;
154
155 #ifdef IPCONFIG_DYNAMIC
156 static DEFINE_SPINLOCK(ic_recv_lock);
157 static volatile int ic_got_reply __initdata = 0; /* Proto(s) that replied */
158 #endif
159 #ifdef IPCONFIG_DHCP
160 static int ic_dhcp_msgtype __initdata = 0; /* DHCP msg type received */
161 #endif
162
163
164 /*
165 * Network devices
166 */
167
168 struct ic_device {
169 struct ic_device *next;
170 struct net_device *dev;
171 unsigned short flags;
172 short able;
173 u32 xid;
174 };
175
176 static struct ic_device *ic_first_dev __initdata = NULL;/* List of open device */
177 static struct net_device *ic_dev __initdata = NULL; /* Selected device */
178
179 static int __init ic_open_devs(void)
180 {
181 struct ic_device *d, **last;
182 struct net_device *dev;
183 unsigned short oflags;
184
185 last = &ic_first_dev;
186 rtnl_shlock();
187
188 /* bring loopback device up first */
189 if (dev_change_flags(&loopback_dev, loopback_dev.flags | IFF_UP) < 0)
190 printk(KERN_ERR "IP-Config: Failed to open %s\n", loopback_dev.name);
191
192 for (dev = dev_base; dev; dev = dev->next) {
193 if (dev == &loopback_dev)
194 continue;
195 if (user_dev_name[0] ? !strcmp(dev->name, user_dev_name) :
196 (!(dev->flags & IFF_LOOPBACK) &&
197 (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) &&
198 strncmp(dev->name, "dummy", 5))) {
199 int able = 0;
200 if (dev->mtu >= 364)
201 able |= IC_BOOTP;
202 else
203 printk(KERN_WARNING "DHCP/BOOTP: Ignoring device %s, MTU %d too small", dev->name, dev->mtu);
204 if (!(dev->flags & IFF_NOARP))
205 able |= IC_RARP;
206 able &= ic_proto_enabled;
207 if (ic_proto_enabled && !able)
208 continue;
209 oflags = dev->flags;
210 if (dev_change_flags(dev, oflags | IFF_UP) < 0) {
211 printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name);
212 continue;
213 }
214 if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) {
215 rtnl_shunlock();
216 return -1;
217 }
218 d->dev = dev;
219 *last = d;
220 last = &d->next;
221 d->flags = oflags;
222 d->able = able;
223 if (able & IC_BOOTP)
224 get_random_bytes(&d->xid, sizeof(u32));
225 else
226 d->xid = 0;
227 ic_proto_have_if |= able;
228 DBG(("IP-Config: %s UP (able=%d, xid=%08x)\n",
229 dev->name, able, d->xid));
230 }
231 }
232 rtnl_shunlock();
233
234 *last = NULL;
235
236 if (!ic_first_dev) {
237 if (user_dev_name[0])
238 printk(KERN_ERR "IP-Config: Device `%s' not found.\n", user_dev_name);
239 else
240 printk(KERN_ERR "IP-Config: No network devices available.\n");
241 return -1;
242 }
243 return 0;
244 }
245
246 static void __init ic_close_devs(void)
247 {
248 struct ic_device *d, *next;
249 struct net_device *dev;
250
251 rtnl_shlock();
252 next = ic_first_dev;
253 while ((d = next)) {
254 next = d->next;
255 dev = d->dev;
256 if (dev != ic_dev) {
257 DBG(("IP-Config: Downing %s\n", dev->name));
258 dev_change_flags(dev, d->flags);
259 }
260 kfree(d);
261 }
262 rtnl_shunlock();
263 }
264
265 /*
266 * Interface to various network functions.
267 */
268
269 static inline void
270 set_sockaddr(struct sockaddr_in *sin, u32 addr, u16 port)
271 {
272 sin->sin_family = AF_INET;
273 sin->sin_addr.s_addr = addr;
274 sin->sin_port = port;
275 }
276
277 static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg)
278 {
279 int res;
280
281 mm_segment_t oldfs = get_fs();
282 set_fs(get_ds());
283 res = devinet_ioctl(cmd, (struct ifreq __user *) arg);
284 set_fs(oldfs);
285 return res;
286 }
287
288 static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg)
289 {
290 int res;
291
292 mm_segment_t oldfs = get_fs();
293 set_fs(get_ds());
294 res = ip_rt_ioctl(cmd, (void __user *) arg);
295 set_fs(oldfs);
296 return res;
297 }
298
299 /*
300 * Set up interface addresses and routes.
301 */
302
303 static int __init ic_setup_if(void)
304 {
305 struct ifreq ir;
306 struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr;
307 int err;
308
309 memset(&ir, 0, sizeof(ir));
310 strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name);
311 set_sockaddr(sin, ic_myaddr, 0);
312 if ((err = ic_dev_ioctl(SIOCSIFADDR, &ir)) < 0) {
313 printk(KERN_ERR "IP-Config: Unable to set interface address (%d).\n", err);
314 return -1;
315 }
316 set_sockaddr(sin, ic_netmask, 0);
317 if ((err = ic_dev_ioctl(SIOCSIFNETMASK, &ir)) < 0) {
318 printk(KERN_ERR "IP-Config: Unable to set interface netmask (%d).\n", err);
319 return -1;
320 }
321 set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0);
322 if ((err = ic_dev_ioctl(SIOCSIFBRDADDR, &ir)) < 0) {
323 printk(KERN_ERR "IP-Config: Unable to set interface broadcast address (%d).\n", err);
324 return -1;
325 }
326 return 0;
327 }
328
329 static int __init ic_setup_routes(void)
330 {
331 /* No need to setup device routes, only the default route... */
332
333 if (ic_gateway != INADDR_NONE) {
334 struct rtentry rm;
335 int err;
336
337 memset(&rm, 0, sizeof(rm));
338 if ((ic_gateway ^ ic_myaddr) & ic_netmask) {
339 printk(KERN_ERR "IP-Config: Gateway not on directly connected network.\n");
340 return -1;
341 }
342 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0);
343 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0);
344 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0);
345 rm.rt_flags = RTF_UP | RTF_GATEWAY;
346 if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) {
347 printk(KERN_ERR "IP-Config: Cannot add default route (%d).\n", err);
348 return -1;
349 }
350 }
351
352 return 0;
353 }
354
355 /*
356 * Fill in default values for all missing parameters.
357 */
358
359 static int __init ic_defaults(void)
360 {
361 /*
362 * At this point we have no userspace running so need not
363 * claim locks on system_utsname
364 */
365
366 if (!ic_host_name_set)
367 sprintf(system_utsname.nodename, "%u.%u.%u.%u", NIPQUAD(ic_myaddr));
368
369 if (root_server_addr == INADDR_NONE)
370 root_server_addr = ic_servaddr;
371
372 if (ic_netmask == INADDR_NONE) {
373 if (IN_CLASSA(ntohl(ic_myaddr)))
374 ic_netmask = htonl(IN_CLASSA_NET);
375 else if (IN_CLASSB(ntohl(ic_myaddr)))
376 ic_netmask = htonl(IN_CLASSB_NET);
377 else if (IN_CLASSC(ntohl(ic_myaddr)))
378 ic_netmask = htonl(IN_CLASSC_NET);
379 else {
380 printk(KERN_ERR "IP-Config: Unable to guess netmask for address %u.%u.%u.%u\n",
381 NIPQUAD(ic_myaddr));
382 return -1;
383 }
384 printk("IP-Config: Guessing netmask %u.%u.%u.%u\n", NIPQUAD(ic_netmask));
385 }
386
387 return 0;
388 }
389
390 /*
391 * RARP support.
392 */
393
394 #ifdef IPCONFIG_RARP
395
396 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt);
397
398 static struct packet_type rarp_packet_type __initdata = {
399 .type = __constant_htons(ETH_P_RARP),
400 .func = ic_rarp_recv,
401 };
402
403 static inline void ic_rarp_init(void)
404 {
405 dev_add_pack(&rarp_packet_type);
406 }
407
408 static inline void ic_rarp_cleanup(void)
409 {
410 dev_remove_pack(&rarp_packet_type);
411 }
412
413 /*
414 * Process received RARP packet.
415 */
416 static int __init
417 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt)
418 {
419 struct arphdr *rarp;
420 unsigned char *rarp_ptr;
421 unsigned long sip, tip;
422 unsigned char *sha, *tha; /* s for "source", t for "target" */
423 struct ic_device *d;
424
425 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
426 return NET_RX_DROP;
427
428 if (!pskb_may_pull(skb, sizeof(struct arphdr)))
429 goto drop;
430
431 /* Basic sanity checks can be done without the lock. */
432 rarp = (struct arphdr *)skb->h.raw;
433
434 /* If this test doesn't pass, it's not IP, or we should
435 * ignore it anyway.
436 */
437 if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd))
438 goto drop;
439
440 /* If it's not a RARP reply, delete it. */
441 if (rarp->ar_op != htons(ARPOP_RREPLY))
442 goto drop;
443
444 /* If it's not Ethernet, delete it. */
445 if (rarp->ar_pro != htons(ETH_P_IP))
446 goto drop;
447
448 if (!pskb_may_pull(skb,
449 sizeof(struct arphdr) +
450 (2 * dev->addr_len) +
451 (2 * 4)))
452 goto drop;
453
454 /* OK, it is all there and looks valid, process... */
455 rarp = (struct arphdr *)skb->h.raw;
456 rarp_ptr = (unsigned char *) (rarp + 1);
457
458 /* One reply at a time, please. */
459 spin_lock(&ic_recv_lock);
460
461 /* If we already have a reply, just drop the packet */
462 if (ic_got_reply)
463 goto drop_unlock;
464
465 /* Find the ic_device that the packet arrived on */
466 d = ic_first_dev;
467 while (d && d->dev != dev)
468 d = d->next;
469 if (!d)
470 goto drop_unlock; /* should never happen */
471
472 /* Extract variable-width fields */
473 sha = rarp_ptr;
474 rarp_ptr += dev->addr_len;
475 memcpy(&sip, rarp_ptr, 4);
476 rarp_ptr += 4;
477 tha = rarp_ptr;
478 rarp_ptr += dev->addr_len;
479 memcpy(&tip, rarp_ptr, 4);
480
481 /* Discard packets which are not meant for us. */
482 if (memcmp(tha, dev->dev_addr, dev->addr_len))
483 goto drop_unlock;
484
485 /* Discard packets which are not from specified server. */
486 if (ic_servaddr != INADDR_NONE && ic_servaddr != sip)
487 goto drop_unlock;
488
489 /* We have a winner! */
490 ic_dev = dev;
491 if (ic_myaddr == INADDR_NONE)
492 ic_myaddr = tip;
493 ic_servaddr = sip;
494 ic_got_reply = IC_RARP;
495
496 drop_unlock:
497 /* Show's over. Nothing to see here. */
498 spin_unlock(&ic_recv_lock);
499
500 drop:
501 /* Throw the packet out. */
502 kfree_skb(skb);
503 return 0;
504 }
505
506
507 /*
508 * Send RARP request packet over a single interface.
509 */
510 static void __init ic_rarp_send_if(struct ic_device *d)
511 {
512 struct net_device *dev = d->dev;
513 arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL,
514 dev->dev_addr, dev->dev_addr);
515 }
516 #endif
517
518 /*
519 * DHCP/BOOTP support.
520 */
521
522 #ifdef IPCONFIG_BOOTP
523
524 struct bootp_pkt { /* BOOTP packet format */
525 struct iphdr iph; /* IP header */
526 struct udphdr udph; /* UDP header */
527 u8 op; /* 1=request, 2=reply */
528 u8 htype; /* HW address type */
529 u8 hlen; /* HW address length */
530 u8 hops; /* Used only by gateways */
531 u32 xid; /* Transaction ID */
532 u16 secs; /* Seconds since we started */
533 u16 flags; /* Just what it says */
534 u32 client_ip; /* Client's IP address if known */
535 u32 your_ip; /* Assigned IP address */
536 u32 server_ip; /* (Next, e.g. NFS) Server's IP address */
537 u32 relay_ip; /* IP address of BOOTP relay */
538 u8 hw_addr[16]; /* Client's HW address */
539 u8 serv_name[64]; /* Server host name */
540 u8 boot_file[128]; /* Name of boot file */
541 u8 exten[312]; /* DHCP options / BOOTP vendor extensions */
542 };
543
544 /* packet ops */
545 #define BOOTP_REQUEST 1
546 #define BOOTP_REPLY 2
547
548 /* DHCP message types */
549 #define DHCPDISCOVER 1
550 #define DHCPOFFER 2
551 #define DHCPREQUEST 3
552 #define DHCPDECLINE 4
553 #define DHCPACK 5
554 #define DHCPNAK 6
555 #define DHCPRELEASE 7
556 #define DHCPINFORM 8
557
558 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt);
559
560 static struct packet_type bootp_packet_type __initdata = {
561 .type = __constant_htons(ETH_P_IP),
562 .func = ic_bootp_recv,
563 };
564
565
566 /*
567 * Initialize DHCP/BOOTP extension fields in the request.
568 */
569
570 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 };
571
572 #ifdef IPCONFIG_DHCP
573
574 static void __init
575 ic_dhcp_init_options(u8 *options)
576 {
577 u8 mt = ((ic_servaddr == INADDR_NONE)
578 ? DHCPDISCOVER : DHCPREQUEST);
579 u8 *e = options;
580
581 #ifdef IPCONFIG_DEBUG
582 printk("DHCP: Sending message type %d\n", mt);
583 #endif
584
585 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */
586 e += 4;
587
588 *e++ = 53; /* DHCP message type */
589 *e++ = 1;
590 *e++ = mt;
591
592 if (mt == DHCPREQUEST) {
593 *e++ = 54; /* Server ID (IP address) */
594 *e++ = 4;
595 memcpy(e, &ic_servaddr, 4);
596 e += 4;
597
598 *e++ = 50; /* Requested IP address */
599 *e++ = 4;
600 memcpy(e, &ic_myaddr, 4);
601 e += 4;
602 }
603
604 /* always? */
605 {
606 static const u8 ic_req_params[] = {
607 1, /* Subnet mask */
608 3, /* Default gateway */
609 6, /* DNS server */
610 12, /* Host name */
611 15, /* Domain name */
612 17, /* Boot path */
613 40, /* NIS domain name */
614 };
615
616 *e++ = 55; /* Parameter request list */
617 *e++ = sizeof(ic_req_params);
618 memcpy(e, ic_req_params, sizeof(ic_req_params));
619 e += sizeof(ic_req_params);
620 }
621
622 *e++ = 255; /* End of the list */
623 }
624
625 #endif /* IPCONFIG_DHCP */
626
627 static void __init ic_bootp_init_ext(u8 *e)
628 {
629 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */
630 e += 4;
631 *e++ = 1; /* Subnet mask request */
632 *e++ = 4;
633 e += 4;
634 *e++ = 3; /* Default gateway request */
635 *e++ = 4;
636 e += 4;
637 *e++ = 5; /* Name server request */
638 *e++ = 8;
639 e += 8;
640 *e++ = 12; /* Host name request */
641 *e++ = 32;
642 e += 32;
643 *e++ = 40; /* NIS Domain name request */
644 *e++ = 32;
645 e += 32;
646 *e++ = 17; /* Boot path */
647 *e++ = 40;
648 e += 40;
649
650 *e++ = 57; /* set extension buffer size for reply */
651 *e++ = 2;
652 *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */
653 *e++ = 150;
654
655 *e++ = 255; /* End of the list */
656 }
657
658
659 /*
660 * Initialize the DHCP/BOOTP mechanism.
661 */
662 static inline void ic_bootp_init(void)
663 {
664 int i;
665
666 for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
667 ic_nameservers[i] = INADDR_NONE;
668
669 dev_add_pack(&bootp_packet_type);
670 }
671
672
673 /*
674 * DHCP/BOOTP cleanup.
675 */
676 static inline void ic_bootp_cleanup(void)
677 {
678 dev_remove_pack(&bootp_packet_type);
679 }
680
681
682 /*
683 * Send DHCP/BOOTP request to single interface.
684 */
685 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff)
686 {
687 struct net_device *dev = d->dev;
688 struct sk_buff *skb;
689 struct bootp_pkt *b;
690 int hh_len = LL_RESERVED_SPACE(dev);
691 struct iphdr *h;
692
693 /* Allocate packet */
694 skb = alloc_skb(sizeof(struct bootp_pkt) + hh_len + 15, GFP_KERNEL);
695 if (!skb)
696 return;
697 skb_reserve(skb, hh_len);
698 b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt));
699 memset(b, 0, sizeof(struct bootp_pkt));
700
701 /* Construct IP header */
702 skb->nh.iph = h = &b->iph;
703 h->version = 4;
704 h->ihl = 5;
705 h->tot_len = htons(sizeof(struct bootp_pkt));
706 h->frag_off = htons(IP_DF);
707 h->ttl = 64;
708 h->protocol = IPPROTO_UDP;
709 h->daddr = INADDR_BROADCAST;
710 h->check = ip_fast_csum((unsigned char *) h, h->ihl);
711
712 /* Construct UDP header */
713 b->udph.source = htons(68);
714 b->udph.dest = htons(67);
715 b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr));
716 /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */
717
718 /* Construct DHCP/BOOTP header */
719 b->op = BOOTP_REQUEST;
720 if (dev->type < 256) /* check for false types */
721 b->htype = dev->type;
722 else if (dev->type == ARPHRD_IEEE802_TR) /* fix for token ring */
723 b->htype = ARPHRD_IEEE802;
724 else if (dev->type == ARPHRD_FDDI)
725 b->htype = ARPHRD_ETHER;
726 else {
727 printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name);
728 b->htype = dev->type; /* can cause undefined behavior */
729 }
730 b->hlen = dev->addr_len;
731 b->your_ip = INADDR_NONE;
732 b->server_ip = INADDR_NONE;
733 memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
734 b->secs = htons(jiffies_diff / HZ);
735 b->xid = d->xid;
736
737 /* add DHCP options or BOOTP extensions */
738 #ifdef IPCONFIG_DHCP
739 if (ic_proto_enabled & IC_USE_DHCP)
740 ic_dhcp_init_options(b->exten);
741 else
742 #endif
743 ic_bootp_init_ext(b->exten);
744
745 /* Chain packet down the line... */
746 skb->dev = dev;
747 skb->protocol = htons(ETH_P_IP);
748 if ((dev->hard_header &&
749 dev->hard_header(skb, dev, ntohs(skb->protocol), dev->broadcast, dev->dev_addr, skb->len) < 0) ||
750 dev_queue_xmit(skb) < 0)
751 printk("E");
752 }
753
754
755 /*
756 * Copy BOOTP-supplied string if not already set.
757 */
758 static int __init ic_bootp_string(char *dest, char *src, int len, int max)
759 {
760 if (!len)
761 return 0;
762 if (len > max-1)
763 len = max-1;
764 memcpy(dest, src, len);
765 dest[len] = '\0';
766 return 1;
767 }
768
769
770 /*
771 * Process BOOTP extensions.
772 */
773 static void __init ic_do_bootp_ext(u8 *ext)
774 {
775 u8 servers;
776 int i;
777
778 #ifdef IPCONFIG_DEBUG
779 u8 *c;
780
781 printk("DHCP/BOOTP: Got extension %d:",*ext);
782 for(c=ext+2; c<ext+2+ext[1]; c++)
783 printk(" %02x", *c);
784 printk("\n");
785 #endif
786
787 switch (*ext++) {
788 case 1: /* Subnet mask */
789 if (ic_netmask == INADDR_NONE)
790 memcpy(&ic_netmask, ext+1, 4);
791 break;
792 case 3: /* Default gateway */
793 if (ic_gateway == INADDR_NONE)
794 memcpy(&ic_gateway, ext+1, 4);
795 break;
796 case 6: /* DNS server */
797 servers= *ext/4;
798 if (servers > CONF_NAMESERVERS_MAX)
799 servers = CONF_NAMESERVERS_MAX;
800 for (i = 0; i < servers; i++) {
801 if (ic_nameservers[i] == INADDR_NONE)
802 memcpy(&ic_nameservers[i], ext+1+4*i, 4);
803 }
804 break;
805 case 12: /* Host name */
806 ic_bootp_string(system_utsname.nodename, ext+1, *ext, __NEW_UTS_LEN);
807 ic_host_name_set = 1;
808 break;
809 case 15: /* Domain name (DNS) */
810 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
811 break;
812 case 17: /* Root path */
813 if (!root_server_path[0])
814 ic_bootp_string(root_server_path, ext+1, *ext, sizeof(root_server_path));
815 break;
816 case 40: /* NIS Domain name (_not_ DNS) */
817 ic_bootp_string(system_utsname.domainname, ext+1, *ext, __NEW_UTS_LEN);
818 break;
819 }
820 }
821
822
823 /*
824 * Receive BOOTP reply.
825 */
826 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt)
827 {
828 struct bootp_pkt *b;
829 struct iphdr *h;
830 struct ic_device *d;
831 int len, ext_len;
832
833 /* Perform verifications before taking the lock. */
834 if (skb->pkt_type == PACKET_OTHERHOST)
835 goto drop;
836
837 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
838 return NET_RX_DROP;
839
840 if (!pskb_may_pull(skb,
841 sizeof(struct iphdr) +
842 sizeof(struct udphdr)))
843 goto drop;
844
845 b = (struct bootp_pkt *) skb->nh.iph;
846 h = &b->iph;
847
848 if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP)
849 goto drop;
850
851 /* Fragments are not supported */
852 if (h->frag_off & htons(IP_OFFSET | IP_MF)) {
853 if (net_ratelimit())
854 printk(KERN_ERR "DHCP/BOOTP: Ignoring fragmented "
855 "reply.\n");
856 goto drop;
857 }
858
859 if (skb->len < ntohs(h->tot_len))
860 goto drop;
861
862 if (ip_fast_csum((char *) h, h->ihl))
863 goto drop;
864
865 if (b->udph.source != htons(67) || b->udph.dest != htons(68))
866 goto drop;
867
868 if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
869 goto drop;
870
871 len = ntohs(b->udph.len) - sizeof(struct udphdr);
872 ext_len = len - (sizeof(*b) -
873 sizeof(struct iphdr) -
874 sizeof(struct udphdr) -
875 sizeof(b->exten));
876 if (ext_len < 0)
877 goto drop;
878
879 /* Ok the front looks good, make sure we can get at the rest. */
880 if (!pskb_may_pull(skb, skb->len))
881 goto drop;
882
883 b = (struct bootp_pkt *) skb->nh.iph;
884 h = &b->iph;
885
886 /* One reply at a time, please. */
887 spin_lock(&ic_recv_lock);
888
889 /* If we already have a reply, just drop the packet */
890 if (ic_got_reply)
891 goto drop_unlock;
892
893 /* Find the ic_device that the packet arrived on */
894 d = ic_first_dev;
895 while (d && d->dev != dev)
896 d = d->next;
897 if (!d)
898 goto drop_unlock; /* should never happen */
899
900 /* Is it a reply to our BOOTP request? */
901 if (b->op != BOOTP_REPLY ||
902 b->xid != d->xid) {
903 if (net_ratelimit())
904 printk(KERN_ERR "DHCP/BOOTP: Reply not for us, "
905 "op[%x] xid[%x]\n",
906 b->op, b->xid);
907 goto drop_unlock;
908 }
909
910 /* Parse extensions */
911 if (ext_len >= 4 &&
912 !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */
913 u8 *end = (u8 *) b + ntohs(b->iph.tot_len);
914 u8 *ext;
915
916 #ifdef IPCONFIG_DHCP
917 if (ic_proto_enabled & IC_USE_DHCP) {
918 u32 server_id = INADDR_NONE;
919 int mt = 0;
920
921 ext = &b->exten[4];
922 while (ext < end && *ext != 0xff) {
923 u8 *opt = ext++;
924 if (*opt == 0) /* Padding */
925 continue;
926 ext += *ext + 1;
927 if (ext >= end)
928 break;
929 switch (*opt) {
930 case 53: /* Message type */
931 if (opt[1])
932 mt = opt[2];
933 break;
934 case 54: /* Server ID (IP address) */
935 if (opt[1] >= 4)
936 memcpy(&server_id, opt + 2, 4);
937 break;
938 };
939 }
940
941 #ifdef IPCONFIG_DEBUG
942 printk("DHCP: Got message type %d\n", mt);
943 #endif
944
945 switch (mt) {
946 case DHCPOFFER:
947 /* While in the process of accepting one offer,
948 * ignore all others.
949 */
950 if (ic_myaddr != INADDR_NONE)
951 goto drop_unlock;
952
953 /* Let's accept that offer. */
954 ic_myaddr = b->your_ip;
955 ic_servaddr = server_id;
956 #ifdef IPCONFIG_DEBUG
957 printk("DHCP: Offered address %u.%u.%u.%u",
958 NIPQUAD(ic_myaddr));
959 printk(" by server %u.%u.%u.%u\n",
960 NIPQUAD(ic_servaddr));
961 #endif
962 /* The DHCP indicated server address takes
963 * precedence over the bootp header one if
964 * they are different.
965 */
966 if ((server_id != INADDR_NONE) &&
967 (b->server_ip != server_id))
968 b->server_ip = ic_servaddr;
969 break;
970
971 case DHCPACK:
972 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0)
973 goto drop_unlock;
974
975 /* Yeah! */
976 break;
977
978 default:
979 /* Urque. Forget it*/
980 ic_myaddr = INADDR_NONE;
981 ic_servaddr = INADDR_NONE;
982 goto drop_unlock;
983 };
984
985 ic_dhcp_msgtype = mt;
986
987 }
988 #endif /* IPCONFIG_DHCP */
989
990 ext = &b->exten[4];
991 while (ext < end && *ext != 0xff) {
992 u8 *opt = ext++;
993 if (*opt == 0) /* Padding */
994 continue;
995 ext += *ext + 1;
996 if (ext < end)
997 ic_do_bootp_ext(opt);
998 }
999 }
1000
1001 /* We have a winner! */
1002 ic_dev = dev;
1003 ic_myaddr = b->your_ip;
1004 ic_servaddr = b->server_ip;
1005 if (ic_gateway == INADDR_NONE && b->relay_ip)
1006 ic_gateway = b->relay_ip;
1007 if (ic_nameservers[0] == INADDR_NONE)
1008 ic_nameservers[0] = ic_servaddr;
1009 ic_got_reply = IC_BOOTP;
1010
1011 drop_unlock:
1012 /* Show's over. Nothing to see here. */
1013 spin_unlock(&ic_recv_lock);
1014
1015 drop:
1016 /* Throw the packet out. */
1017 kfree_skb(skb);
1018
1019 return 0;
1020 }
1021
1022
1023 #endif
1024
1025
1026 /*
1027 * Dynamic IP configuration -- DHCP, BOOTP, RARP.
1028 */
1029
1030 #ifdef IPCONFIG_DYNAMIC
1031
1032 static int __init ic_dynamic(void)
1033 {
1034 int retries;
1035 struct ic_device *d;
1036 unsigned long start_jiffies, timeout, jiff;
1037 int do_bootp = ic_proto_have_if & IC_BOOTP;
1038 int do_rarp = ic_proto_have_if & IC_RARP;
1039
1040 /*
1041 * If none of DHCP/BOOTP/RARP was selected, return with an error.
1042 * This routine gets only called when some pieces of information
1043 * are missing, and without DHCP/BOOTP/RARP we are unable to get it.
1044 */
1045 if (!ic_proto_enabled) {
1046 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
1047 return -1;
1048 }
1049
1050 #ifdef IPCONFIG_BOOTP
1051 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
1052 printk(KERN_ERR "DHCP/BOOTP: No suitable device found.\n");
1053 #endif
1054 #ifdef IPCONFIG_RARP
1055 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)
1056 printk(KERN_ERR "RARP: No suitable device found.\n");
1057 #endif
1058
1059 if (!ic_proto_have_if)
1060 /* Error message already printed */
1061 return -1;
1062
1063 /*
1064 * Setup protocols
1065 */
1066 #ifdef IPCONFIG_BOOTP
1067 if (do_bootp)
1068 ic_bootp_init();
1069 #endif
1070 #ifdef IPCONFIG_RARP
1071 if (do_rarp)
1072 ic_rarp_init();
1073 #endif
1074
1075 /*
1076 * Send requests and wait, until we get an answer. This loop
1077 * seems to be a terrible waste of CPU time, but actually there is
1078 * only one process running at all, so we don't need to use any
1079 * scheduler functions.
1080 * [Actually we could now, but the nothing else running note still
1081 * applies.. - AC]
1082 */
1083 printk(KERN_NOTICE "Sending %s%s%s requests .",
1084 do_bootp
1085 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "",
1086 (do_bootp && do_rarp) ? " and " : "",
1087 do_rarp ? "RARP" : "");
1088
1089 start_jiffies = jiffies;
1090 d = ic_first_dev;
1091 retries = CONF_SEND_RETRIES;
1092 get_random_bytes(&timeout, sizeof(timeout));
1093 timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned) CONF_TIMEOUT_RANDOM);
1094 for(;;) {
1095 #ifdef IPCONFIG_BOOTP
1096 if (do_bootp && (d->able & IC_BOOTP))
1097 ic_bootp_send_if(d, jiffies - start_jiffies);
1098 #endif
1099 #ifdef IPCONFIG_RARP
1100 if (do_rarp && (d->able & IC_RARP))
1101 ic_rarp_send_if(d);
1102 #endif
1103
1104 jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout);
1105 while (time_before(jiffies, jiff) && !ic_got_reply) {
1106 set_current_state(TASK_UNINTERRUPTIBLE);
1107 schedule_timeout(1);
1108 }
1109 #ifdef IPCONFIG_DHCP
1110 /* DHCP isn't done until we get a DHCPACK. */
1111 if ((ic_got_reply & IC_BOOTP)
1112 && (ic_proto_enabled & IC_USE_DHCP)
1113 && ic_dhcp_msgtype != DHCPACK)
1114 {
1115 ic_got_reply = 0;
1116 printk(",");
1117 continue;
1118 }
1119 #endif /* IPCONFIG_DHCP */
1120
1121 if (ic_got_reply) {
1122 printk(" OK\n");
1123 break;
1124 }
1125
1126 if ((d = d->next))
1127 continue;
1128
1129 if (! --retries) {
1130 printk(" timed out!\n");
1131 break;
1132 }
1133
1134 d = ic_first_dev;
1135
1136 timeout = timeout CONF_TIMEOUT_MULT;
1137 if (timeout > CONF_TIMEOUT_MAX)
1138 timeout = CONF_TIMEOUT_MAX;
1139
1140 printk(".");
1141 }
1142
1143 #ifdef IPCONFIG_BOOTP
1144 if (do_bootp)
1145 ic_bootp_cleanup();
1146 #endif
1147 #ifdef IPCONFIG_RARP
1148 if (do_rarp)
1149 ic_rarp_cleanup();
1150 #endif
1151
1152 if (!ic_got_reply)
1153 return -1;
1154
1155 printk("IP-Config: Got %s answer from %u.%u.%u.%u, ",
1156 ((ic_got_reply & IC_RARP) ? "RARP"
1157 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),
1158 NIPQUAD(ic_servaddr));
1159 printk("my address is %u.%u.%u.%u\n", NIPQUAD(ic_myaddr));
1160
1161 return 0;
1162 }
1163
1164 #endif /* IPCONFIG_DYNAMIC */
1165
1166 #ifdef CONFIG_PROC_FS
1167
1168 static int pnp_seq_show(struct seq_file *seq, void *v)
1169 {
1170 int i;
1171
1172 if (ic_proto_used & IC_PROTO)
1173 seq_printf(seq, "#PROTO: %s\n",
1174 (ic_proto_used & IC_RARP) ? "RARP"
1175 : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP");
1176 else
1177 seq_puts(seq, "#MANUAL\n");
1178
1179 if (ic_domain[0])
1180 seq_printf(seq,
1181 "domain %s\n", ic_domain);
1182 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {
1183 if (ic_nameservers[i] != INADDR_NONE)
1184 seq_printf(seq,
1185 "nameserver %u.%u.%u.%u\n",
1186 NIPQUAD(ic_nameservers[i]));
1187 }
1188 if (ic_servaddr != INADDR_NONE)
1189 seq_printf(seq,
1190 "bootserver %u.%u.%u.%u\n",
1191 NIPQUAD(ic_servaddr));
1192 return 0;
1193 }
1194
1195 static int pnp_seq_open(struct inode *indoe, struct file *file)
1196 {
1197 return single_open(file, pnp_seq_show, NULL);
1198 }
1199
1200 static struct file_operations pnp_seq_fops = {
1201 .owner = THIS_MODULE,
1202 .open = pnp_seq_open,
1203 .read = seq_read,
1204 .llseek = seq_lseek,
1205 .release = single_release,
1206 };
1207 #endif /* CONFIG_PROC_FS */
1208
1209 /*
1210 * Extract IP address from the parameter string if needed. Note that we
1211 * need to have root_server_addr set _before_ IPConfig gets called as it
1212 * can override it.
1213 */
1214 u32 __init root_nfs_parse_addr(char *name)
1215 {
1216 u32 addr;
1217 int octets = 0;
1218 char *cp, *cq;
1219
1220 cp = cq = name;
1221 while (octets < 4) {
1222 while (*cp >= '0' && *cp <= '9')
1223 cp++;
1224 if (cp == cq || cp - cq > 3)
1225 break;
1226 if (*cp == '.' || octets == 3)
1227 octets++;
1228 if (octets < 4)
1229 cp++;
1230 cq = cp;
1231 }
1232 if (octets == 4 && (*cp == ':' || *cp == '\0')) {
1233 if (*cp == ':')
1234 *cp++ = '\0';
1235 addr = in_aton(name);
1236 memmove(name, cp, strlen(cp) + 1);
1237 } else
1238 addr = INADDR_NONE;
1239
1240 return addr;
1241 }
1242
1243 /*
1244 * IP Autoconfig dispatcher.
1245 */
1246
1247 static int __init ip_auto_config(void)
1248 {
1249 u32 addr;
1250
1251 #ifdef CONFIG_PROC_FS
1252 proc_net_fops_create("pnp", S_IRUGO, &pnp_seq_fops);
1253 #endif /* CONFIG_PROC_FS */
1254
1255 if (!ic_enable)
1256 return 0;
1257
1258 DBG(("IP-Config: Entered.\n"));
1259 #ifdef IPCONFIG_DYNAMIC
1260 try_try_again:
1261 #endif
1262 /* Give hardware a chance to settle */
1263 msleep(CONF_PRE_OPEN);
1264
1265 /* Setup all network devices */
1266 if (ic_open_devs() < 0)
1267 return -1;
1268
1269 /* Give drivers a chance to settle */
1270 ssleep(CONF_POST_OPEN);
1271
1272 /*
1273 * If the config information is insufficient (e.g., our IP address or
1274 * IP address of the boot server is missing or we have multiple network
1275 * interfaces and no default was set), use BOOTP or RARP to get the
1276 * missing values.
1277 */
1278 if (ic_myaddr == INADDR_NONE ||
1279 #ifdef CONFIG_ROOT_NFS
1280 (MAJOR(ROOT_DEV) == UNNAMED_MAJOR
1281 && root_server_addr == INADDR_NONE
1282 && ic_servaddr == INADDR_NONE) ||
1283 #endif
1284 ic_first_dev->next) {
1285 #ifdef IPCONFIG_DYNAMIC
1286
1287 int retries = CONF_OPEN_RETRIES;
1288
1289 if (ic_dynamic() < 0) {
1290 ic_close_devs();
1291
1292 /*
1293 * I don't know why, but sometimes the
1294 * eepro100 driver (at least) gets upset and
1295 * doesn't work the first time it's opened.
1296 * But then if you close it and reopen it, it
1297 * works just fine. So we need to try that at
1298 * least once before giving up.
1299 *
1300 * Also, if the root will be NFS-mounted, we
1301 * have nowhere to go if DHCP fails. So we
1302 * just have to keep trying forever.
1303 *
1304 * -- Chip
1305 */
1306 #ifdef CONFIG_ROOT_NFS
1307 if (ROOT_DEV == Root_NFS) {
1308 printk(KERN_ERR
1309 "IP-Config: Retrying forever (NFS root)...\n");
1310 goto try_try_again;
1311 }
1312 #endif
1313
1314 if (--retries) {
1315 printk(KERN_ERR
1316 "IP-Config: Reopening network devices...\n");
1317 goto try_try_again;
1318 }
1319
1320 /* Oh, well. At least we tried. */
1321 printk(KERN_ERR "IP-Config: Auto-configuration of network failed.\n");
1322 return -1;
1323 }
1324 #else /* !DYNAMIC */
1325 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
1326 ic_close_devs();
1327 return -1;
1328 #endif /* IPCONFIG_DYNAMIC */
1329 } else {
1330 /* Device selected manually or only one device -> use it */
1331 ic_dev = ic_first_dev->dev;
1332 }
1333
1334 addr = root_nfs_parse_addr(root_server_path);
1335 if (root_server_addr == INADDR_NONE)
1336 root_server_addr = addr;
1337
1338 /*
1339 * Use defaults whereever applicable.
1340 */
1341 if (ic_defaults() < 0)
1342 return -1;
1343
1344 /*
1345 * Close all network devices except the device we've
1346 * autoconfigured and set up routes.
1347 */
1348 ic_close_devs();
1349 if (ic_setup_if() < 0 || ic_setup_routes() < 0)
1350 return -1;
1351
1352 /*
1353 * Record which protocol was actually used.
1354 */
1355 #ifdef IPCONFIG_DYNAMIC
1356 ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP);
1357 #endif
1358
1359 #ifndef IPCONFIG_SILENT
1360 /*
1361 * Clue in the operator.
1362 */
1363 printk("IP-Config: Complete:");
1364 printk("\n device=%s", ic_dev->name);
1365 printk(", addr=%u.%u.%u.%u", NIPQUAD(ic_myaddr));
1366 printk(", mask=%u.%u.%u.%u", NIPQUAD(ic_netmask));
1367 printk(", gw=%u.%u.%u.%u", NIPQUAD(ic_gateway));
1368 printk(",\n host=%s, domain=%s, nis-domain=%s",
1369 system_utsname.nodename, ic_domain, system_utsname.domainname);
1370 printk(",\n bootserver=%u.%u.%u.%u", NIPQUAD(ic_servaddr));
1371 printk(", rootserver=%u.%u.%u.%u", NIPQUAD(root_server_addr));
1372 printk(", rootpath=%s", root_server_path);
1373 printk("\n");
1374 #endif /* !SILENT */
1375
1376 return 0;
1377 }
1378
1379 late_initcall(ip_auto_config);
1380
1381
1382 /*
1383 * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
1384 * command line parameter. It consists of option fields separated by colons in
1385 * the following order:
1386 *
1387 * <client-ip>:<server-ip>:<gw-ip>:<netmask>:<host name>:<device>:<PROTO>
1388 *
1389 * Any of the fields can be empty which means to use a default value:
1390 * <client-ip> - address given by BOOTP or RARP
1391 * <server-ip> - address of host returning BOOTP or RARP packet
1392 * <gw-ip> - none, or the address returned by BOOTP
1393 * <netmask> - automatically determined from <client-ip>, or the
1394 * one returned by BOOTP
1395 * <host name> - <client-ip> in ASCII notation, or the name returned
1396 * by BOOTP
1397 * <device> - use all available devices
1398 * <PROTO>:
1399 * off|none - don't do autoconfig at all (DEFAULT)
1400 * on|any - use any configured protocol
1401 * dhcp|bootp|rarp - use only the specified protocol
1402 * both - use both BOOTP and RARP (not DHCP)
1403 */
1404 static int __init ic_proto_name(char *name)
1405 {
1406 if (!strcmp(name, "on") || !strcmp(name, "any")) {
1407 return 1;
1408 }
1409 #ifdef CONFIG_IP_PNP_DHCP
1410 else if (!strcmp(name, "dhcp")) {
1411 ic_proto_enabled &= ~IC_RARP;
1412 return 1;
1413 }
1414 #endif
1415 #ifdef CONFIG_IP_PNP_BOOTP
1416 else if (!strcmp(name, "bootp")) {
1417 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP);
1418 return 1;
1419 }
1420 #endif
1421 #ifdef CONFIG_IP_PNP_RARP
1422 else if (!strcmp(name, "rarp")) {
1423 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP);
1424 return 1;
1425 }
1426 #endif
1427 #ifdef IPCONFIG_DYNAMIC
1428 else if (!strcmp(name, "both")) {
1429 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */
1430 return 1;
1431 }
1432 #endif
1433 return 0;
1434 }
1435
1436 static int __init ip_auto_config_setup(char *addrs)
1437 {
1438 char *cp, *ip, *dp;
1439 int num = 0;
1440
1441 ic_set_manually = 1;
1442
1443 ic_enable = (*addrs &&
1444 (strcmp(addrs, "off") != 0) &&
1445 (strcmp(addrs, "none") != 0));
1446 if (!ic_enable)
1447 return 1;
1448
1449 if (ic_proto_name(addrs))
1450 return 1;
1451
1452 /* Parse the whole string */
1453 ip = addrs;
1454 while (ip && *ip) {
1455 if ((cp = strchr(ip, ':')))
1456 *cp++ = '\0';
1457 if (strlen(ip) > 0) {
1458 DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip));
1459 switch (num) {
1460 case 0:
1461 if ((ic_myaddr = in_aton(ip)) == INADDR_ANY)
1462 ic_myaddr = INADDR_NONE;
1463 break;
1464 case 1:
1465 if ((ic_servaddr = in_aton(ip)) == INADDR_ANY)
1466 ic_servaddr = INADDR_NONE;
1467 break;
1468 case 2:
1469 if ((ic_gateway = in_aton(ip)) == INADDR_ANY)
1470 ic_gateway = INADDR_NONE;
1471 break;
1472 case 3:
1473 if ((ic_netmask = in_aton(ip)) == INADDR_ANY)
1474 ic_netmask = INADDR_NONE;
1475 break;
1476 case 4:
1477 if ((dp = strchr(ip, '.'))) {
1478 *dp++ = '\0';
1479 strlcpy(system_utsname.domainname, dp,
1480 sizeof(system_utsname.domainname));
1481 }
1482 strlcpy(system_utsname.nodename, ip,
1483 sizeof(system_utsname.nodename));
1484 ic_host_name_set = 1;
1485 break;
1486 case 5:
1487 strlcpy(user_dev_name, ip, sizeof(user_dev_name));
1488 break;
1489 case 6:
1490 ic_proto_name(ip);
1491 break;
1492 }
1493 }
1494 ip = cp;
1495 num++;
1496 }
1497
1498 return 1;
1499 }
1500
1501 static int __init nfsaddrs_config_setup(char *addrs)
1502 {
1503 return ip_auto_config_setup(addrs);
1504 }
1505
1506 __setup("ip=", ip_auto_config_setup);
1507 __setup("nfsaddrs=", nfsaddrs_config_setup);
kernel-based virtual machine