1 /*
2 * $Id: ipconfig.c,v 1.43.2.1 2001/12/13 10:39:53 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 * Multipe 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/sched.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/major.h>
54 #include <net/arp.h>
55 #include <net/ip.h>
56 #include <net/ipconfig.h>
57
58 #include <asm/uaccess.h>
59 #include <asm/checksum.h>
60 #include <asm/processor.h>
61
62 /* Define this to allow debugging output */
63 #undef IPCONFIG_DEBUG
64
65 #ifdef IPCONFIG_DEBUG
66 #define DBG(x) printk x
67 #else
68 #define DBG(x) do { } while(0)
69 #endif
70
71 #if defined(CONFIG_IP_PNP_DHCP)
72 #define IPCONFIG_DHCP
73 #endif
74 #if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_DHCP)
75 #define IPCONFIG_BOOTP
76 #endif
77 #if defined(CONFIG_IP_PNP_RARP)
78 #define IPCONFIG_RARP
79 #endif
80 #if defined(IPCONFIG_BOOTP) || defined(IPCONFIG_RARP)
81 #define IPCONFIG_DYNAMIC
82 #endif
83
84 /* Define the friendly delay before and after opening net devices */
85 #define CONF_PRE_OPEN (HZ/2) /* Before opening: 1/2 second */
86 #define CONF_POST_OPEN (1*HZ) /* After opening: 1 second */
87
88 /* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */
89 #define CONF_OPEN_RETRIES 2 /* (Re)open devices twice */
90 #define CONF_SEND_RETRIES 6 /* Send six requests per open */
91 #define CONF_INTER_TIMEOUT (HZ/2) /* Inter-device timeout: 1/2 second */
92 #define CONF_BASE_TIMEOUT (HZ*2) /* Initial timeout: 2 seconds */
93 #define CONF_TIMEOUT_RANDOM (HZ) /* Maximum amount of randomization */
94 #define CONF_TIMEOUT_MULT *7/4 /* Rate of timeout growth */
95 #define CONF_TIMEOUT_MAX (HZ*30) /* Maximum allowed timeout */
96 #define CONF_NAMESERVERS_MAX 3 /* Maximum number of nameservers
97 - '3' from resolv.h */
98
99
100 /*
101 * Public IP configuration
102 */
103
104 /* This is used by platforms which might be able to set the ipconfig
105 * variables using firmware environment vars. If this is set, it will
106 * ignore such firmware variables.
107 */
108 int ic_set_manually __initdata = 0; /* IPconfig parameters set manually */
109
110 int ic_enable __initdata = 0; /* IP config enabled? */
111
112 /* Protocol choice */
113 int ic_proto_enabled __initdata = 0
114 #ifdef IPCONFIG_BOOTP
115 | IC_BOOTP
116 #endif
117 #ifdef CONFIG_IP_PNP_DHCP
118 | IC_USE_DHCP
119 #endif
120 #ifdef IPCONFIG_RARP
121 | IC_RARP
122 #endif
123 ;
124
125 int ic_host_name_set __initdata = 0; /* Host name set by us? */
126
127 u32 ic_myaddr = INADDR_NONE; /* My IP address */
128 u32 ic_netmask = INADDR_NONE; /* Netmask for local subnet */
129 u32 ic_gateway = INADDR_NONE; /* Gateway IP address */
130
131 u32 ic_servaddr = INADDR_NONE; /* Boot server IP address */
132
133 u32 root_server_addr = INADDR_NONE; /* Address of NFS server */
134 u8 root_server_path[256] = { 0, }; /* Path to mount as root */
135
136 /* Persistent data: */
137
138 int ic_proto_used; /* Protocol used, if any */
139 u32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */
140 u8 ic_domain[64]; /* DNS (not NIS) domain name */
141
142 /*
143 * Private state.
144 */
145
146 /* Name of user-selected boot device */
147 static char user_dev_name[IFNAMSIZ] __initdata = { 0, };
148
149 /* Protocols supported by available interfaces */
150 static int ic_proto_have_if __initdata = 0;
151
152 #ifdef IPCONFIG_DYNAMIC
153 static spinlock_t ic_recv_lock = SPIN_LOCK_UNLOCKED;
154 static volatile int ic_got_reply __initdata = 0; /* Proto(s) that replied */
155 #endif
156 #ifdef IPCONFIG_DHCP
157 static int ic_dhcp_msgtype __initdata = 0; /* DHCP msg type received */
158 #endif
159
160
161 /*
162 * Network devices
163 */
164
165 struct ic_device {
166 struct ic_device *next;
167 struct net_device *dev;
168 unsigned short flags;
169 short able;
170 u32 xid;
171 };
172
173 static struct ic_device *ic_first_dev __initdata = NULL;/* List of open device */
174 static struct net_device *ic_dev __initdata = NULL; /* Selected device */
175
ic_open_devs(void)176 static int __init ic_open_devs(void)
177 {
178 struct ic_device *d, **last;
179 struct net_device *dev;
180 unsigned short oflags;
181
182 last = &ic_first_dev;
183 rtnl_shlock();
184 for (dev = dev_base; dev; dev = dev->next) {
185 if (user_dev_name[0] ? !strcmp(dev->name, user_dev_name) :
186 (!(dev->flags & IFF_LOOPBACK) &&
187 (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) &&
188 strncmp(dev->name, "dummy", 5))) {
189 int able = 0;
190 if (dev->mtu >= 364)
191 able |= IC_BOOTP;
192 else
193 printk(KERN_WARNING "DHCP/BOOTP: Ignoring device %s, MTU %d too small", dev->name, dev->mtu);
194 if (!(dev->flags & IFF_NOARP))
195 able |= IC_RARP;
196 able &= ic_proto_enabled;
197 if (ic_proto_enabled && !able)
198 continue;
199 oflags = dev->flags;
200 if (dev_change_flags(dev, oflags | IFF_UP) < 0) {
201 printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name);
202 continue;
203 }
204 if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) {
205 rtnl_shunlock();
206 return -1;
207 }
208 d->dev = dev;
209 *last = d;
210 last = &d->next;
211 d->flags = oflags;
212 d->able = able;
213 if (able & IC_BOOTP)
214 get_random_bytes(&d->xid, sizeof(u32));
215 else
216 d->xid = 0;
217 ic_proto_have_if |= able;
218 DBG(("IP-Config: %s UP (able=%d, xid=%08x)\n",
219 dev->name, able, d->xid));
220 }
221 }
222 rtnl_shunlock();
223
224 *last = NULL;
225
226 if (!ic_first_dev) {
227 if (user_dev_name[0])
228 printk(KERN_ERR "IP-Config: Device `%s' not found.\n", user_dev_name);
229 else
230 printk(KERN_ERR "IP-Config: No network devices available.\n");
231 return -1;
232 }
233 return 0;
234 }
235
ic_close_devs(void)236 static void __init ic_close_devs(void)
237 {
238 struct ic_device *d, *next;
239 struct net_device *dev;
240
241 rtnl_shlock();
242 next = ic_first_dev;
243 while ((d = next)) {
244 next = d->next;
245 dev = d->dev;
246 if (dev != ic_dev) {
247 DBG(("IP-Config: Downing %s\n", dev->name));
248 dev_change_flags(dev, d->flags);
249 }
250 kfree(d);
251 }
252 rtnl_shunlock();
253 }
254
255 /*
256 * Interface to various network functions.
257 */
258
259 static inline void
set_sockaddr(struct sockaddr_in * sin,u32 addr,u16 port)260 set_sockaddr(struct sockaddr_in *sin, u32 addr, u16 port)
261 {
262 sin->sin_family = AF_INET;
263 sin->sin_addr.s_addr = addr;
264 sin->sin_port = port;
265 }
266
ic_dev_ioctl(unsigned int cmd,struct ifreq * arg)267 static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg)
268 {
269 int res;
270
271 mm_segment_t oldfs = get_fs();
272 set_fs(get_ds());
273 res = devinet_ioctl(cmd, arg);
274 set_fs(oldfs);
275 return res;
276 }
277
ic_route_ioctl(unsigned int cmd,struct rtentry * arg)278 static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg)
279 {
280 int res;
281
282 mm_segment_t oldfs = get_fs();
283 set_fs(get_ds());
284 res = ip_rt_ioctl(cmd, arg);
285 set_fs(oldfs);
286 return res;
287 }
288
289 /*
290 * Set up interface addresses and routes.
291 */
292
ic_setup_if(void)293 static int __init ic_setup_if(void)
294 {
295 struct ifreq ir;
296 struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr;
297 int err;
298
299 memset(&ir, 0, sizeof(ir));
300 strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name);
301 set_sockaddr(sin, ic_myaddr, 0);
302 if ((err = ic_dev_ioctl(SIOCSIFADDR, &ir)) < 0) {
303 printk(KERN_ERR "IP-Config: Unable to set interface address (%d).\n", err);
304 return -1;
305 }
306 set_sockaddr(sin, ic_netmask, 0);
307 if ((err = ic_dev_ioctl(SIOCSIFNETMASK, &ir)) < 0) {
308 printk(KERN_ERR "IP-Config: Unable to set interface netmask (%d).\n", err);
309 return -1;
310 }
311 set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0);
312 if ((err = ic_dev_ioctl(SIOCSIFBRDADDR, &ir)) < 0) {
313 printk(KERN_ERR "IP-Config: Unable to set interface broadcast address (%d).\n", err);
314 return -1;
315 }
316 return 0;
317 }
318
ic_setup_routes(void)319 static int __init ic_setup_routes(void)
320 {
321 /* No need to setup device routes, only the default route... */
322
323 if (ic_gateway != INADDR_NONE) {
324 struct rtentry rm;
325 int err;
326
327 memset(&rm, 0, sizeof(rm));
328 if ((ic_gateway ^ ic_myaddr) & ic_netmask) {
329 printk(KERN_ERR "IP-Config: Gateway not on directly connected network.\n");
330 return -1;
331 }
332 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0);
333 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0);
334 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0);
335 rm.rt_flags = RTF_UP | RTF_GATEWAY;
336 if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) {
337 printk(KERN_ERR "IP-Config: Cannot add default route (%d).\n", err);
338 return -1;
339 }
340 }
341
342 return 0;
343 }
344
345 /*
346 * Fill in default values for all missing parameters.
347 */
348
ic_defaults(void)349 static int __init ic_defaults(void)
350 {
351 /*
352 * At this point we have no userspace running so need not
353 * claim locks on system_utsname
354 */
355
356 if (!ic_host_name_set)
357 sprintf(system_utsname.nodename, "%u.%u.%u.%u", NIPQUAD(ic_myaddr));
358
359 if (root_server_addr == INADDR_NONE)
360 root_server_addr = ic_servaddr;
361
362 if (ic_netmask == INADDR_NONE) {
363 if (IN_CLASSA(ntohl(ic_myaddr)))
364 ic_netmask = htonl(IN_CLASSA_NET);
365 else if (IN_CLASSB(ntohl(ic_myaddr)))
366 ic_netmask = htonl(IN_CLASSB_NET);
367 else if (IN_CLASSC(ntohl(ic_myaddr)))
368 ic_netmask = htonl(IN_CLASSC_NET);
369 else {
370 printk(KERN_ERR "IP-Config: Unable to guess netmask for address %u.%u.%u.%u\n",
371 NIPQUAD(ic_myaddr));
372 return -1;
373 }
374 printk("IP-Config: Guessing netmask %u.%u.%u.%u\n", NIPQUAD(ic_netmask));
375 }
376
377 return 0;
378 }
379
380 /*
381 * RARP support.
382 */
383
384 #ifdef IPCONFIG_RARP
385
386 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt);
387
388 static struct packet_type rarp_packet_type __initdata = {
389 type: __constant_htons(ETH_P_RARP),
390 func: ic_rarp_recv,
391 };
392
ic_rarp_init(void)393 static inline void ic_rarp_init(void)
394 {
395 dev_add_pack(&rarp_packet_type);
396 }
397
ic_rarp_cleanup(void)398 static inline void ic_rarp_cleanup(void)
399 {
400 dev_remove_pack(&rarp_packet_type);
401 }
402
403 /*
404 * Process received RARP packet.
405 */
406 static int __init
ic_rarp_recv(struct sk_buff * skb,struct net_device * dev,struct packet_type * pt)407 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt)
408 {
409 struct arphdr *rarp = (struct arphdr *)skb->h.raw;
410 unsigned char *rarp_ptr = (unsigned char *) (rarp + 1);
411 unsigned long sip, tip;
412 unsigned char *sha, *tha; /* s for "source", t for "target" */
413 struct ic_device *d;
414
415 /* One reply at a time, please. */
416 spin_lock(&ic_recv_lock);
417
418 /* If we already have a reply, just drop the packet */
419 if (ic_got_reply)
420 goto drop;
421
422 /* Find the ic_device that the packet arrived on */
423 d = ic_first_dev;
424 while (d && d->dev != dev)
425 d = d->next;
426 if (!d)
427 goto drop; /* should never happen */
428
429 /* If this test doesn't pass, it's not IP, or we should ignore it anyway */
430 if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd))
431 goto drop;
432
433 /* If it's not a RARP reply, delete it. */
434 if (rarp->ar_op != htons(ARPOP_RREPLY))
435 goto drop;
436
437 /* If it's not Ethernet, delete it. */
438 if (rarp->ar_pro != htons(ETH_P_IP))
439 goto drop;
440
441 /* Extract variable-width fields */
442 sha = rarp_ptr;
443 rarp_ptr += dev->addr_len;
444 memcpy(&sip, rarp_ptr, 4);
445 rarp_ptr += 4;
446 tha = rarp_ptr;
447 rarp_ptr += dev->addr_len;
448 memcpy(&tip, rarp_ptr, 4);
449
450 /* Discard packets which are not meant for us. */
451 if (memcmp(tha, dev->dev_addr, dev->addr_len))
452 goto drop;
453
454 /* Discard packets which are not from specified server. */
455 if (ic_servaddr != INADDR_NONE && ic_servaddr != sip)
456 goto drop;
457
458 /* We have a winner! */
459 ic_dev = dev;
460 if (ic_myaddr == INADDR_NONE)
461 ic_myaddr = tip;
462 ic_servaddr = sip;
463 ic_got_reply = IC_RARP;
464
465 drop:
466 /* Show's over. Nothing to see here. */
467 spin_unlock(&ic_recv_lock);
468
469 /* Throw the packet out. */
470 kfree_skb(skb);
471 return 0;
472 }
473
474
475 /*
476 * Send RARP request packet over a single interface.
477 */
ic_rarp_send_if(struct ic_device * d)478 static void __init ic_rarp_send_if(struct ic_device *d)
479 {
480 struct net_device *dev = d->dev;
481 arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL,
482 dev->dev_addr, dev->dev_addr);
483 }
484 #endif
485
486 /*
487 * DHCP/BOOTP support.
488 */
489
490 #ifdef IPCONFIG_BOOTP
491
492 struct bootp_pkt { /* BOOTP packet format */
493 struct iphdr iph; /* IP header */
494 struct udphdr udph; /* UDP header */
495 u8 op; /* 1=request, 2=reply */
496 u8 htype; /* HW address type */
497 u8 hlen; /* HW address length */
498 u8 hops; /* Used only by gateways */
499 u32 xid; /* Transaction ID */
500 u16 secs; /* Seconds since we started */
501 u16 flags; /* Just what it says */
502 u32 client_ip; /* Client's IP address if known */
503 u32 your_ip; /* Assigned IP address */
504 u32 server_ip; /* (Next, e.g. NFS) Server's IP address */
505 u32 relay_ip; /* IP address of BOOTP relay */
506 u8 hw_addr[16]; /* Client's HW address */
507 u8 serv_name[64]; /* Server host name */
508 u8 boot_file[128]; /* Name of boot file */
509 u8 exten[312]; /* DHCP options / BOOTP vendor extensions */
510 };
511
512 /* packet ops */
513 #define BOOTP_REQUEST 1
514 #define BOOTP_REPLY 2
515
516 /* DHCP message types */
517 #define DHCPDISCOVER 1
518 #define DHCPOFFER 2
519 #define DHCPREQUEST 3
520 #define DHCPDECLINE 4
521 #define DHCPACK 5
522 #define DHCPNAK 6
523 #define DHCPRELEASE 7
524 #define DHCPINFORM 8
525
526 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt);
527
528 static struct packet_type bootp_packet_type __initdata = {
529 type: __constant_htons(ETH_P_IP),
530 func: ic_bootp_recv,
531 };
532
533
534 /*
535 * Initialize DHCP/BOOTP extension fields in the request.
536 */
537
538 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 };
539
540 #ifdef IPCONFIG_DHCP
541
542 static void __init
ic_dhcp_init_options(u8 * options)543 ic_dhcp_init_options(u8 *options)
544 {
545 u8 mt = ((ic_servaddr == INADDR_NONE)
546 ? DHCPDISCOVER : DHCPREQUEST);
547 u8 *e = options;
548
549 #ifdef IPCONFIG_DEBUG
550 printk("DHCP: Sending message type %d\n", mt);
551 #endif
552
553 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */
554 e += 4;
555
556 *e++ = 53; /* DHCP message type */
557 *e++ = 1;
558 *e++ = mt;
559
560 if (mt == DHCPREQUEST) {
561 *e++ = 54; /* Server ID (IP address) */
562 *e++ = 4;
563 memcpy(e, &ic_servaddr, 4);
564 e += 4;
565
566 *e++ = 50; /* Requested IP address */
567 *e++ = 4;
568 memcpy(e, &ic_myaddr, 4);
569 e += 4;
570 }
571
572 /* always? */
573 {
574 static const u8 ic_req_params[] = {
575 1, /* Subnet mask */
576 3, /* Default gateway */
577 6, /* DNS server */
578 12, /* Host name */
579 15, /* Domain name */
580 17, /* Boot path */
581 40, /* NIS domain name */
582 };
583
584 *e++ = 55; /* Parameter request list */
585 *e++ = sizeof(ic_req_params);
586 memcpy(e, ic_req_params, sizeof(ic_req_params));
587 e += sizeof(ic_req_params);
588 }
589
590 *e++ = 255; /* End of the list */
591 }
592
593 #endif /* IPCONFIG_DHCP */
594
ic_bootp_init_ext(u8 * e)595 static void __init ic_bootp_init_ext(u8 *e)
596 {
597 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */
598 e += 4;
599 *e++ = 1; /* Subnet mask request */
600 *e++ = 4;
601 e += 4;
602 *e++ = 3; /* Default gateway request */
603 *e++ = 4;
604 e += 4;
605 *e++ = 5; /* Name server reqeust */
606 *e++ = 8;
607 e += 8;
608 *e++ = 12; /* Host name request */
609 *e++ = 32;
610 e += 32;
611 *e++ = 40; /* NIS Domain name request */
612 *e++ = 32;
613 e += 32;
614 *e++ = 17; /* Boot path */
615 *e++ = 40;
616 e += 40;
617
618 *e++ = 57; /* set extension buffer size for reply */
619 *e++ = 2;
620 *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */
621 *e++ = 150;
622
623 *e++ = 255; /* End of the list */
624 }
625
626
627 /*
628 * Initialize the DHCP/BOOTP mechanism.
629 */
ic_bootp_init(void)630 static inline void ic_bootp_init(void)
631 {
632 int i;
633
634 for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
635 ic_nameservers[i] = INADDR_NONE;
636
637 dev_add_pack(&bootp_packet_type);
638 }
639
640
641 /*
642 * DHCP/BOOTP cleanup.
643 */
ic_bootp_cleanup(void)644 static inline void ic_bootp_cleanup(void)
645 {
646 dev_remove_pack(&bootp_packet_type);
647 }
648
649
650 /*
651 * Send DHCP/BOOTP request to single interface.
652 */
ic_bootp_send_if(struct ic_device * d,unsigned long jiffies_diff)653 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff)
654 {
655 struct net_device *dev = d->dev;
656 struct sk_buff *skb;
657 struct bootp_pkt *b;
658 int hh_len = (dev->hard_header_len + 15) & ~15;
659 struct iphdr *h;
660
661 /* Allocate packet */
662 skb = alloc_skb(sizeof(struct bootp_pkt) + hh_len + 15, GFP_KERNEL);
663 if (!skb)
664 return;
665 skb_reserve(skb, hh_len);
666 b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt));
667 memset(b, 0, sizeof(struct bootp_pkt));
668
669 /* Construct IP header */
670 skb->nh.iph = h = &b->iph;
671 h->version = 4;
672 h->ihl = 5;
673 h->tot_len = htons(sizeof(struct bootp_pkt));
674 h->frag_off = htons(IP_DF);
675 h->ttl = 64;
676 h->protocol = IPPROTO_UDP;
677 h->daddr = INADDR_BROADCAST;
678 h->check = ip_fast_csum((unsigned char *) h, h->ihl);
679
680 /* Construct UDP header */
681 b->udph.source = htons(68);
682 b->udph.dest = htons(67);
683 b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr));
684 /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */
685
686 /* Construct DHCP/BOOTP header */
687 b->op = BOOTP_REQUEST;
688 if (dev->type < 256) /* check for false types */
689 b->htype = dev->type;
690 else if (dev->type == ARPHRD_IEEE802_TR) /* fix for token ring */
691 b->htype = ARPHRD_IEEE802;
692 else if (dev->type == ARPHRD_FDDI)
693 b->htype = ARPHRD_ETHER;
694 else {
695 printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name);
696 b->htype = dev->type; /* can cause undefined behavior */
697 }
698 b->hlen = dev->addr_len;
699 b->your_ip = INADDR_NONE;
700 b->server_ip = INADDR_NONE;
701 memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
702 b->secs = htons(jiffies_diff / HZ);
703 b->xid = d->xid;
704
705 /* add DHCP options or BOOTP extensions */
706 #ifdef IPCONFIG_DHCP
707 if (ic_proto_enabled & IC_USE_DHCP)
708 ic_dhcp_init_options(b->exten);
709 else
710 #endif
711 ic_bootp_init_ext(b->exten);
712
713 /* Chain packet down the line... */
714 skb->dev = dev;
715 skb->protocol = htons(ETH_P_IP);
716 if ((dev->hard_header &&
717 dev->hard_header(skb, dev, ntohs(skb->protocol), dev->broadcast, dev->dev_addr, skb->len) < 0) ||
718 dev_queue_xmit(skb) < 0)
719 printk("E");
720 }
721
722
723 /*
724 * Copy BOOTP-supplied string if not already set.
725 */
ic_bootp_string(char * dest,char * src,int len,int max)726 static int __init ic_bootp_string(char *dest, char *src, int len, int max)
727 {
728 if (!len)
729 return 0;
730 if (len > max-1)
731 len = max-1;
732 memcpy(dest, src, len);
733 dest[len] = '\0';
734 return 1;
735 }
736
737
738 /*
739 * Process BOOTP extensions.
740 */
ic_do_bootp_ext(u8 * ext)741 static void __init ic_do_bootp_ext(u8 *ext)
742 {
743 u8 servers;
744 int i;
745
746 #ifdef IPCONFIG_DEBUG
747 u8 *c;
748
749 printk("DHCP/BOOTP: Got extension %d:",*ext);
750 for(c=ext+2; c<ext+2+ext[1]; c++)
751 printk(" %02x", *c);
752 printk("\n");
753 #endif
754
755 switch (*ext++) {
756 case 1: /* Subnet mask */
757 if (ic_netmask == INADDR_NONE)
758 memcpy(&ic_netmask, ext+1, 4);
759 break;
760 case 3: /* Default gateway */
761 if (ic_gateway == INADDR_NONE)
762 memcpy(&ic_gateway, ext+1, 4);
763 break;
764 case 6: /* DNS server */
765 servers= *ext/4;
766 if (servers > CONF_NAMESERVERS_MAX)
767 servers = CONF_NAMESERVERS_MAX;
768 for (i = 0; i < servers; i++) {
769 if (ic_nameservers[i] == INADDR_NONE)
770 memcpy(&ic_nameservers[i], ext+1+4*i, 4);
771 }
772 break;
773 case 12: /* Host name */
774 ic_bootp_string(system_utsname.nodename, ext+1, *ext, __NEW_UTS_LEN);
775 ic_host_name_set = 1;
776 break;
777 case 15: /* Domain name (DNS) */
778 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
779 break;
780 case 17: /* Root path */
781 if (!root_server_path[0])
782 ic_bootp_string(root_server_path, ext+1, *ext, sizeof(root_server_path));
783 break;
784 case 40: /* NIS Domain name (_not_ DNS) */
785 ic_bootp_string(system_utsname.domainname, ext+1, *ext, __NEW_UTS_LEN);
786 break;
787 }
788 }
789
790
791 /*
792 * Receive BOOTP reply.
793 */
ic_bootp_recv(struct sk_buff * skb,struct net_device * dev,struct packet_type * pt)794 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt)
795 {
796 struct bootp_pkt *b = (struct bootp_pkt *) skb->nh.iph;
797 struct iphdr *h = &b->iph;
798 struct ic_device *d;
799 int len;
800
801 /* One reply at a time, please. */
802 spin_lock(&ic_recv_lock);
803
804 /* If we already have a reply, just drop the packet */
805 if (ic_got_reply)
806 goto drop;
807
808 /* Find the ic_device that the packet arrived on */
809 d = ic_first_dev;
810 while (d && d->dev != dev)
811 d = d->next;
812 if (!d)
813 goto drop; /* should never happen */
814
815 /* Check whether it's a BOOTP packet */
816 if (skb->pkt_type == PACKET_OTHERHOST ||
817 skb->len < sizeof(struct udphdr) + sizeof(struct iphdr) ||
818 h->ihl != 5 ||
819 h->version != 4 ||
820 ip_fast_csum((char *) h, h->ihl) != 0 ||
821 skb->len < ntohs(h->tot_len) ||
822 h->protocol != IPPROTO_UDP ||
823 b->udph.source != htons(67) ||
824 b->udph.dest != htons(68) ||
825 ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
826 goto drop;
827
828 /* Fragments are not supported */
829 if (h->frag_off & htons(IP_OFFSET | IP_MF)) {
830 printk(KERN_ERR "DHCP/BOOTP: Ignoring fragmented reply.\n");
831 goto drop;
832 }
833
834 /* Is it a reply to our BOOTP request? */
835 len = ntohs(b->udph.len) - sizeof(struct udphdr);
836 if (len < 300 || /* See RFC 951:2.1 */
837 b->op != BOOTP_REPLY ||
838 b->xid != d->xid) {
839 printk("?");
840 goto drop;
841 }
842
843 /* Parse extensions */
844 if (!memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */
845 u8 *end = (u8 *) b + ntohs(b->iph.tot_len);
846 u8 *ext;
847
848 #ifdef IPCONFIG_DHCP
849 if (ic_proto_enabled & IC_USE_DHCP) {
850 u32 server_id = INADDR_NONE;
851 int mt = 0;
852
853 ext = &b->exten[4];
854 while (ext < end && *ext != 0xff) {
855 u8 *opt = ext++;
856 if (*opt == 0) /* Padding */
857 continue;
858 ext += *ext + 1;
859 if (ext >= end)
860 break;
861 switch (*opt) {
862 case 53: /* Message type */
863 if (opt[1])
864 mt = opt[2];
865 break;
866 case 54: /* Server ID (IP address) */
867 if (opt[1] >= 4)
868 memcpy(&server_id, opt + 2, 4);
869 break;
870 };
871 }
872
873 #ifdef IPCONFIG_DEBUG
874 printk("DHCP: Got message type %d\n", mt);
875 #endif
876
877 switch (mt) {
878 case DHCPOFFER:
879 /* While in the process of accepting one offer,
880 * ignore all others.
881 */
882 if (ic_myaddr != INADDR_NONE)
883 goto drop;
884
885 /* Let's accept that offer. */
886 ic_myaddr = b->your_ip;
887 ic_servaddr = server_id;
888 #ifdef IPCONFIG_DEBUG
889 printk("DHCP: Offered address %u.%u.%u.%u",
890 NIPQUAD(ic_myaddr));
891 printk(" by server %u.%u.%u.%u\n",
892 NIPQUAD(ic_servaddr));
893 #endif
894 /* The DHCP indicated server address takes
895 * precedence over the bootp header one if
896 * they are different.
897 */
898 if ((server_id != INADDR_NONE) &&
899 (b->server_ip != server_id))
900 b->server_ip = ic_servaddr;
901 break;
902
903 case DHCPACK:
904 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0)
905 goto drop;
906
907 /* Yeah! */
908 break;
909
910 default:
911 /* Urque. Forget it*/
912 ic_myaddr = INADDR_NONE;
913 ic_servaddr = INADDR_NONE;
914 goto drop;
915 };
916
917 ic_dhcp_msgtype = mt;
918
919 }
920 #endif /* IPCONFIG_DHCP */
921
922 ext = &b->exten[4];
923 while (ext < end && *ext != 0xff) {
924 u8 *opt = ext++;
925 if (*opt == 0) /* Padding */
926 continue;
927 ext += *ext + 1;
928 if (ext < end)
929 ic_do_bootp_ext(opt);
930 }
931 }
932
933 /* We have a winner! */
934 ic_dev = dev;
935 ic_myaddr = b->your_ip;
936 ic_servaddr = b->server_ip;
937 if (ic_gateway == INADDR_NONE && b->relay_ip)
938 ic_gateway = b->relay_ip;
939 if (ic_nameservers[0] == INADDR_NONE)
940 ic_nameservers[0] = ic_servaddr;
941 ic_got_reply = IC_BOOTP;
942
943 drop:
944 /* Show's over. Nothing to see here. */
945 spin_unlock(&ic_recv_lock);
946
947 /* Throw the packet out. */
948 kfree_skb(skb);
949
950 return 0;
951 }
952
953
954 #endif
955
956
957 /*
958 * Dynamic IP configuration -- DHCP, BOOTP, RARP.
959 */
960
961 #ifdef IPCONFIG_DYNAMIC
962
ic_dynamic(void)963 static int __init ic_dynamic(void)
964 {
965 int retries;
966 struct ic_device *d;
967 unsigned long start_jiffies, timeout, jiff;
968 int do_bootp = ic_proto_have_if & IC_BOOTP;
969 int do_rarp = ic_proto_have_if & IC_RARP;
970
971 /*
972 * If none of DHCP/BOOTP/RARP was selected, return with an error.
973 * This routine gets only called when some pieces of information
974 * are missing, and without DHCP/BOOTP/RARP we are unable to get it.
975 */
976 if (!ic_proto_enabled) {
977 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
978 return -1;
979 }
980
981 #ifdef IPCONFIG_BOOTP
982 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
983 printk(KERN_ERR "DHCP/BOOTP: No suitable device found.\n");
984 #endif
985 #ifdef IPCONFIG_RARP
986 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)
987 printk(KERN_ERR "RARP: No suitable device found.\n");
988 #endif
989
990 if (!ic_proto_have_if)
991 /* Error message already printed */
992 return -1;
993
994 /*
995 * Setup protocols
996 */
997 #ifdef IPCONFIG_BOOTP
998 if (do_bootp)
999 ic_bootp_init();
1000 #endif
1001 #ifdef IPCONFIG_RARP
1002 if (do_rarp)
1003 ic_rarp_init();
1004 #endif
1005
1006 /*
1007 * Send requests and wait, until we get an answer. This loop
1008 * seems to be a terrible waste of CPU time, but actually there is
1009 * only one process running at all, so we don't need to use any
1010 * scheduler functions.
1011 * [Actually we could now, but the nothing else running note still
1012 * applies.. - AC]
1013 */
1014 printk(KERN_NOTICE "Sending %s%s%s requests .",
1015 do_bootp
1016 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "",
1017 (do_bootp && do_rarp) ? " and " : "",
1018 do_rarp ? "RARP" : "");
1019
1020 start_jiffies = jiffies;
1021 d = ic_first_dev;
1022 retries = CONF_SEND_RETRIES;
1023 get_random_bytes(&timeout, sizeof(timeout));
1024 timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned) CONF_TIMEOUT_RANDOM);
1025 for(;;) {
1026 #ifdef IPCONFIG_BOOTP
1027 if (do_bootp && (d->able & IC_BOOTP))
1028 ic_bootp_send_if(d, jiffies - start_jiffies);
1029 #endif
1030 #ifdef IPCONFIG_RARP
1031 if (do_rarp && (d->able & IC_RARP))
1032 ic_rarp_send_if(d);
1033 #endif
1034
1035 jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout);
1036 while (time_before(jiffies, jiff) && !ic_got_reply) {
1037 __set_current_state(TASK_UNINTERRUPTIBLE);
1038 schedule_timeout(1);
1039 }
1040 #ifdef IPCONFIG_DHCP
1041 /* DHCP isn't done until we get a DHCPACK. */
1042 if ((ic_got_reply & IC_BOOTP)
1043 && (ic_proto_enabled & IC_USE_DHCP)
1044 && ic_dhcp_msgtype != DHCPACK)
1045 {
1046 ic_got_reply = 0;
1047 printk(",");
1048 continue;
1049 }
1050 #endif /* IPCONFIG_DHCP */
1051
1052 if (ic_got_reply) {
1053 printk(" OK\n");
1054 break;
1055 }
1056
1057 if ((d = d->next))
1058 continue;
1059
1060 if (! --retries) {
1061 printk(" timed out!\n");
1062 break;
1063 }
1064
1065 d = ic_first_dev;
1066
1067 timeout = timeout CONF_TIMEOUT_MULT;
1068 if (timeout > CONF_TIMEOUT_MAX)
1069 timeout = CONF_TIMEOUT_MAX;
1070
1071 printk(".");
1072 }
1073
1074 #ifdef IPCONFIG_BOOTP
1075 if (do_bootp)
1076 ic_bootp_cleanup();
1077 #endif
1078 #ifdef IPCONFIG_RARP
1079 if (do_rarp)
1080 ic_rarp_cleanup();
1081 #endif
1082
1083 if (!ic_got_reply)
1084 return -1;
1085
1086 printk("IP-Config: Got %s answer from %u.%u.%u.%u, ",
1087 ((ic_got_reply & IC_RARP) ? "RARP"
1088 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),
1089 NIPQUAD(ic_servaddr));
1090 printk("my address is %u.%u.%u.%u\n", NIPQUAD(ic_myaddr));
1091
1092 return 0;
1093 }
1094
1095 #endif /* IPCONFIG_DYNAMIC */
1096
1097 #ifdef CONFIG_PROC_FS
1098
pnp_get_info(char * buffer,char ** start,off_t offset,int length)1099 static int pnp_get_info(char *buffer, char **start,
1100 off_t offset, int length)
1101 {
1102 int len;
1103 int i;
1104
1105 if (ic_proto_used & IC_PROTO)
1106 sprintf(buffer, "#PROTO: %s\n",
1107 (ic_proto_used & IC_RARP) ? "RARP"
1108 : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP");
1109 else
1110 strcpy(buffer, "#MANUAL\n");
1111 len = strlen(buffer);
1112
1113 if (ic_domain[0])
1114 len += sprintf(buffer + len,
1115 "domain %s\n", ic_domain);
1116 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {
1117 if (ic_nameservers[i] != INADDR_NONE)
1118 len += sprintf(buffer + len,
1119 "nameserver %u.%u.%u.%u\n",
1120 NIPQUAD(ic_nameservers[i]));
1121 }
1122 if (ic_servaddr != INADDR_NONE)
1123 len += sprintf(buffer + len,
1124 "bootserver %u.%u.%u.%u\n",
1125 NIPQUAD(ic_servaddr));
1126
1127 if (offset > len)
1128 offset = len;
1129 *start = buffer + offset;
1130
1131 if (offset + length > len)
1132 length = len - offset;
1133 return length;
1134 }
1135
1136 #endif /* CONFIG_PROC_FS */
1137
1138 /*
1139 * Extract IP address from the parameter string if needed. Note that we
1140 * need to have root_server_addr set _before_ IPConfig gets called as it
1141 * can override it.
1142 */
root_nfs_parse_addr(char * name)1143 u32 __init root_nfs_parse_addr(char *name)
1144 {
1145 u32 addr;
1146 int octets = 0;
1147 char *cp, *cq;
1148
1149 cp = cq = name;
1150 while (octets < 4) {
1151 while (*cp >= '0' && *cp <= '9')
1152 cp++;
1153 if (cp == cq || cp - cq > 3)
1154 break;
1155 if (*cp == '.' || octets == 3)
1156 octets++;
1157 if (octets < 4)
1158 cp++;
1159 cq = cp;
1160 }
1161 if (octets == 4 && (*cp == ':' || *cp == '\0')) {
1162 if (*cp == ':')
1163 *cp++ = '\0';
1164 addr = in_aton(name);
1165 memmove(name, cp, strlen(cp) + 1);
1166 } else
1167 addr = INADDR_NONE;
1168
1169 return addr;
1170 }
1171
1172 /*
1173 * IP Autoconfig dispatcher.
1174 */
1175
ip_auto_config(void)1176 static int __init ip_auto_config(void)
1177 {
1178 unsigned long jiff;
1179 u32 addr;
1180
1181 #ifdef CONFIG_PROC_FS
1182 proc_net_create("pnp", 0, pnp_get_info);
1183 #endif /* CONFIG_PROC_FS */
1184
1185 if (!ic_enable)
1186 return 0;
1187
1188 DBG(("IP-Config: Entered.\n"));
1189
1190 #ifdef IPCONFIG_DYNAMIC
1191 try_try_again:
1192 #endif
1193 /* Give hardware a chance to settle */
1194 jiff = jiffies + CONF_PRE_OPEN;
1195 while (time_before(jiffies, jiff))
1196 ;
1197
1198 /* Setup all network devices */
1199 if (ic_open_devs() < 0)
1200 return -1;
1201
1202 /* Give drivers a chance to settle */
1203 jiff = jiffies + CONF_POST_OPEN;
1204 while (time_before(jiffies, jiff))
1205 ;
1206
1207 /*
1208 * If the config information is insufficient (e.g., our IP address or
1209 * IP address of the boot server is missing or we have multiple network
1210 * interfaces and no default was set), use BOOTP or RARP to get the
1211 * missing values.
1212 */
1213 if (ic_myaddr == INADDR_NONE ||
1214 #ifdef CONFIG_ROOT_NFS
1215 (MAJOR(ROOT_DEV) == UNNAMED_MAJOR
1216 && root_server_addr == INADDR_NONE
1217 && ic_servaddr == INADDR_NONE) ||
1218 #endif
1219 ic_first_dev->next) {
1220 #ifdef IPCONFIG_DYNAMIC
1221
1222 int retries = CONF_OPEN_RETRIES;
1223
1224 if (ic_dynamic() < 0) {
1225 ic_close_devs();
1226
1227 /*
1228 * I don't know why, but sometimes the
1229 * eepro100 driver (at least) gets upset and
1230 * doesn't work the first time it's opened.
1231 * But then if you close it and reopen it, it
1232 * works just fine. So we need to try that at
1233 * least once before giving up.
1234 *
1235 * Also, if the root will be NFS-mounted, we
1236 * have nowhere to go if DHCP fails. So we
1237 * just have to keep trying forever.
1238 *
1239 * -- Chip
1240 */
1241 #ifdef CONFIG_ROOT_NFS
1242 if (ROOT_DEV == MKDEV(NFS_MAJOR, NFS_MINOR)) {
1243 printk(KERN_ERR
1244 "IP-Config: Retrying forever (NFS root)...\n");
1245 goto try_try_again;
1246 }
1247 #endif
1248
1249 if (--retries) {
1250 printk(KERN_ERR
1251 "IP-Config: Reopening network devices...\n");
1252 goto try_try_again;
1253 }
1254
1255 /* Oh, well. At least we tried. */
1256 printk(KERN_ERR "IP-Config: Auto-configuration of network failed.\n");
1257 return -1;
1258 }
1259 #else /* !DYNAMIC */
1260 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
1261 ic_close_devs();
1262 return -1;
1263 #endif /* IPCONFIG_DYNAMIC */
1264 } else {
1265 /* Device selected manually or only one device -> use it */
1266 ic_dev = ic_first_dev->dev;
1267 }
1268
1269 addr = root_nfs_parse_addr(root_server_path);
1270 if (root_server_addr == INADDR_NONE)
1271 root_server_addr = addr;
1272
1273 /*
1274 * Use defaults whereever applicable.
1275 */
1276 if (ic_defaults() < 0)
1277 return -1;
1278
1279 /*
1280 * Close all network devices except the device we've
1281 * autoconfigured and set up routes.
1282 */
1283 ic_close_devs();
1284 if (ic_setup_if() < 0 || ic_setup_routes() < 0)
1285 return -1;
1286
1287 /*
1288 * Record which protocol was actually used.
1289 */
1290 #ifdef IPCONFIG_DYNAMIC
1291 ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP);
1292 #endif
1293
1294 #ifndef IPCONFIG_SILENT
1295 /*
1296 * Clue in the operator.
1297 */
1298 printk("IP-Config: Complete:");
1299 printk("\n device=%s", ic_dev->name);
1300 printk(", addr=%u.%u.%u.%u", NIPQUAD(ic_myaddr));
1301 printk(", mask=%u.%u.%u.%u", NIPQUAD(ic_netmask));
1302 printk(", gw=%u.%u.%u.%u", NIPQUAD(ic_gateway));
1303 printk(",\n host=%s, domain=%s, nis-domain=%s",
1304 system_utsname.nodename, ic_domain, system_utsname.domainname);
1305 printk(",\n bootserver=%u.%u.%u.%u", NIPQUAD(ic_servaddr));
1306 printk(", rootserver=%u.%u.%u.%u", NIPQUAD(root_server_addr));
1307 printk(", rootpath=%s", root_server_path);
1308 printk("\n");
1309 #endif /* !SILENT */
1310
1311 return 0;
1312 }
1313
1314 module_init(ip_auto_config);
1315
1316
1317 /*
1318 * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
1319 * command line parameter. It consists of option fields separated by colons in
1320 * the following order:
1321 *
1322 * <client-ip>:<server-ip>:<gw-ip>:<netmask>:<host name>:<device>:<PROTO>
1323 *
1324 * Any of the fields can be empty which means to use a default value:
1325 * <client-ip> - address given by BOOTP or RARP
1326 * <server-ip> - address of host returning BOOTP or RARP packet
1327 * <gw-ip> - none, or the address returned by BOOTP
1328 * <netmask> - automatically determined from <client-ip>, or the
1329 * one returned by BOOTP
1330 * <host name> - <client-ip> in ASCII notation, or the name returned
1331 * by BOOTP
1332 * <device> - use all available devices
1333 * <PROTO>:
1334 * off|none - don't do autoconfig at all (DEFAULT)
1335 * on|any - use any configured protocol
1336 * dhcp|bootp|rarp - use only the specified protocol
1337 * both - use both BOOTP and RARP (not DHCP)
1338 */
ic_proto_name(char * name)1339 static int __init ic_proto_name(char *name)
1340 {
1341 if (!strcmp(name, "on") || !strcmp(name, "any")) {
1342 return 1;
1343 }
1344 #ifdef CONFIG_IP_PNP_DHCP
1345 else if (!strcmp(name, "dhcp")) {
1346 ic_proto_enabled &= ~IC_RARP;
1347 return 1;
1348 }
1349 #endif
1350 #ifdef CONFIG_IP_PNP_BOOTP
1351 else if (!strcmp(name, "bootp")) {
1352 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP);
1353 return 1;
1354 }
1355 #endif
1356 #ifdef CONFIG_IP_PNP_RARP
1357 else if (!strcmp(name, "rarp")) {
1358 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP);
1359 return 1;
1360 }
1361 #endif
1362 #ifdef IPCONFIG_DYNAMIC
1363 else if (!strcmp(name, "both")) {
1364 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */
1365 return 1;
1366 }
1367 #endif
1368 return 0;
1369 }
1370
ip_auto_config_setup(char * addrs)1371 static int __init ip_auto_config_setup(char *addrs)
1372 {
1373 char *cp, *ip, *dp;
1374 int num = 0;
1375
1376 ic_set_manually = 1;
1377
1378 ic_enable = (*addrs &&
1379 (strcmp(addrs, "off") != 0) &&
1380 (strcmp(addrs, "none") != 0));
1381 if (!ic_enable)
1382 return 1;
1383
1384 if (ic_proto_name(addrs))
1385 return 1;
1386
1387 /* Parse the whole string */
1388 ip = addrs;
1389 while (ip && *ip) {
1390 if ((cp = strchr(ip, ':')))
1391 *cp++ = '\0';
1392 if (strlen(ip) > 0) {
1393 DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip));
1394 switch (num) {
1395 case 0:
1396 if ((ic_myaddr = in_aton(ip)) == INADDR_ANY)
1397 ic_myaddr = INADDR_NONE;
1398 break;
1399 case 1:
1400 if ((ic_servaddr = in_aton(ip)) == INADDR_ANY)
1401 ic_servaddr = INADDR_NONE;
1402 break;
1403 case 2:
1404 if ((ic_gateway = in_aton(ip)) == INADDR_ANY)
1405 ic_gateway = INADDR_NONE;
1406 break;
1407 case 3:
1408 if ((ic_netmask = in_aton(ip)) == INADDR_ANY)
1409 ic_netmask = INADDR_NONE;
1410 break;
1411 case 4:
1412 if ((dp = strchr(ip, '.'))) {
1413 *dp++ = '\0';
1414 strncpy(system_utsname.domainname, dp, __NEW_UTS_LEN);
1415 system_utsname.domainname[__NEW_UTS_LEN] = '\0';
1416 }
1417 strncpy(system_utsname.nodename, ip, __NEW_UTS_LEN);
1418 system_utsname.nodename[__NEW_UTS_LEN] = '\0';
1419 ic_host_name_set = 1;
1420 break;
1421 case 5:
1422 strncpy(user_dev_name, ip, IFNAMSIZ);
1423 user_dev_name[IFNAMSIZ-1] = '\0';
1424 break;
1425 case 6:
1426 ic_proto_name(ip);
1427 break;
1428 }
1429 }
1430 ip = cp;
1431 num++;
1432 }
1433
1434 return 1;
1435 }
1436
nfsaddrs_config_setup(char * addrs)1437 static int __init nfsaddrs_config_setup(char *addrs)
1438 {
1439 return ip_auto_config_setup(addrs);
1440 }
1441
1442 __setup("ip=", ip_auto_config_setup);
1443 __setup("nfsaddrs=", nfsaddrs_config_setup);
1444