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Merge git://git.kernel.org/pub/scm/linux/kernel/git/agk/linux-2.6-dm
[deliverable/linux.git] / net / ipv4 / ipconfig.c
1 /*
2 * Automatic Configuration of IP -- use DHCP, BOOTP, RARP, or
3 * user-supplied information to configure own IP address and routes.
4 *
5 * Copyright (C) 1996-1998 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
6 *
7 * Derived from network configuration code in fs/nfs/nfsroot.c,
8 * originally Copyright (C) 1995, 1996 Gero Kuhlmann and me.
9 *
10 * BOOTP rewritten to construct and analyse packets itself instead
11 * of misusing the IP layer. num_bugs_causing_wrong_arp_replies--;
12 * -- MJ, December 1998
13 *
14 * Fixed ip_auto_config_setup calling at startup in the new "Linker Magic"
15 * initialization scheme.
16 * - Arnaldo Carvalho de Melo <acme@conectiva.com.br>, 08/11/1999
17 *
18 * DHCP support added. To users this looks like a whole separate
19 * protocol, but we know it's just a bag on the side of BOOTP.
20 * -- Chip Salzenberg <chip@valinux.com>, May 2000
21 *
22 * Ported DHCP support from 2.2.16 to 2.4.0-test4
23 * -- Eric Biederman <ebiederman@lnxi.com>, 30 Aug 2000
24 *
25 * Merged changes from 2.2.19 into 2.4.3
26 * -- Eric Biederman <ebiederman@lnxi.com>, 22 April Aug 2001
27 *
28 * Multiple Nameservers in /proc/net/pnp
29 * -- Josef Siemes <jsiemes@web.de>, Aug 2002
30 */
31
32 #include <linux/types.h>
33 #include <linux/string.h>
34 #include <linux/kernel.h>
35 #include <linux/jiffies.h>
36 #include <linux/random.h>
37 #include <linux/init.h>
38 #include <linux/utsname.h>
39 #include <linux/in.h>
40 #include <linux/if.h>
41 #include <linux/inet.h>
42 #include <linux/inetdevice.h>
43 #include <linux/netdevice.h>
44 #include <linux/if_arp.h>
45 #include <linux/skbuff.h>
46 #include <linux/ip.h>
47 #include <linux/socket.h>
48 #include <linux/route.h>
49 #include <linux/udp.h>
50 #include <linux/proc_fs.h>
51 #include <linux/seq_file.h>
52 #include <linux/major.h>
53 #include <linux/root_dev.h>
54 #include <linux/delay.h>
55 #include <linux/nfs_fs.h>
56 #include <net/net_namespace.h>
57 #include <net/arp.h>
58 #include <net/ip.h>
59 #include <net/ipconfig.h>
60 #include <net/route.h>
61
62 #include <asm/uaccess.h>
63 #include <net/checksum.h>
64 #include <asm/processor.h>
65
66 /* Define this to allow debugging output */
67 #undef IPCONFIG_DEBUG
68
69 #ifdef IPCONFIG_DEBUG
70 #define DBG(x) printk x
71 #else
72 #define DBG(x) do { } while(0)
73 #endif
74
75 #if defined(CONFIG_IP_PNP_DHCP)
76 #define IPCONFIG_DHCP
77 #endif
78 #if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_DHCP)
79 #define IPCONFIG_BOOTP
80 #endif
81 #if defined(CONFIG_IP_PNP_RARP)
82 #define IPCONFIG_RARP
83 #endif
84 #if defined(IPCONFIG_BOOTP) || defined(IPCONFIG_RARP)
85 #define IPCONFIG_DYNAMIC
86 #endif
87
88 /* Define the friendly delay before and after opening net devices */
89 #define CONF_PRE_OPEN 500 /* Before opening: 1/2 second */
90 #define CONF_POST_OPEN 1 /* After opening: 1 second */
91
92 /* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */
93 #define CONF_OPEN_RETRIES 2 /* (Re)open devices twice */
94 #define CONF_SEND_RETRIES 6 /* Send six requests per open */
95 #define CONF_INTER_TIMEOUT (HZ/2) /* Inter-device timeout: 1/2 second */
96 #define CONF_BASE_TIMEOUT (HZ*2) /* Initial timeout: 2 seconds */
97 #define CONF_TIMEOUT_RANDOM (HZ) /* Maximum amount of randomization */
98 #define CONF_TIMEOUT_MULT *7/4 /* Rate of timeout growth */
99 #define CONF_TIMEOUT_MAX (HZ*30) /* Maximum allowed timeout */
100 #define CONF_NAMESERVERS_MAX 3 /* Maximum number of nameservers
101 - '3' from resolv.h */
102
103 #define NONE __constant_htonl(INADDR_NONE)
104 #define ANY __constant_htonl(INADDR_ANY)
105
106 /*
107 * Public IP configuration
108 */
109
110 /* This is used by platforms which might be able to set the ipconfig
111 * variables using firmware environment vars. If this is set, it will
112 * ignore such firmware variables.
113 */
114 int ic_set_manually __initdata = 0; /* IPconfig parameters set manually */
115
116 static int ic_enable __initdata = 0; /* IP config enabled? */
117
118 /* Protocol choice */
119 int ic_proto_enabled __initdata = 0
120 #ifdef IPCONFIG_BOOTP
121 | IC_BOOTP
122 #endif
123 #ifdef CONFIG_IP_PNP_DHCP
124 | IC_USE_DHCP
125 #endif
126 #ifdef IPCONFIG_RARP
127 | IC_RARP
128 #endif
129 ;
130
131 static int ic_host_name_set __initdata = 0; /* Host name set by us? */
132
133 __be32 ic_myaddr = NONE; /* My IP address */
134 static __be32 ic_netmask = NONE; /* Netmask for local subnet */
135 __be32 ic_gateway = NONE; /* Gateway IP address */
136
137 __be32 ic_servaddr = NONE; /* Boot server IP address */
138
139 __be32 root_server_addr = NONE; /* Address of NFS server */
140 u8 root_server_path[256] = { 0, }; /* Path to mount as root */
141
142 /* vendor class identifier */
143 static char vendor_class_identifier[253] __initdata;
144
145 /* Persistent data: */
146
147 static int ic_proto_used; /* Protocol used, if any */
148 static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */
149 static u8 ic_domain[64]; /* DNS (not NIS) domain name */
150
151 /*
152 * Private state.
153 */
154
155 /* Name of user-selected boot device */
156 static char user_dev_name[IFNAMSIZ] __initdata = { 0, };
157
158 /* Protocols supported by available interfaces */
159 static int ic_proto_have_if __initdata = 0;
160
161 #ifdef IPCONFIG_DYNAMIC
162 static DEFINE_SPINLOCK(ic_recv_lock);
163 static volatile int ic_got_reply __initdata = 0; /* Proto(s) that replied */
164 #endif
165 #ifdef IPCONFIG_DHCP
166 static int ic_dhcp_msgtype __initdata = 0; /* DHCP msg type received */
167 #endif
168
169
170 /*
171 * Network devices
172 */
173
174 struct ic_device {
175 struct ic_device *next;
176 struct net_device *dev;
177 unsigned short flags;
178 short able;
179 __be32 xid;
180 };
181
182 static struct ic_device *ic_first_dev __initdata = NULL;/* List of open device */
183 static struct net_device *ic_dev __initdata = NULL; /* Selected device */
184
185 static int __init ic_open_devs(void)
186 {
187 struct ic_device *d, **last;
188 struct net_device *dev;
189 unsigned short oflags;
190
191 last = &ic_first_dev;
192 rtnl_lock();
193
194 /* bring loopback device up first */
195 for_each_netdev(&init_net, dev) {
196 if (!(dev->flags & IFF_LOOPBACK))
197 continue;
198 if (dev_change_flags(dev, dev->flags | IFF_UP) < 0)
199 printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name);
200 }
201
202 for_each_netdev(&init_net, dev) {
203 if (dev->flags & IFF_LOOPBACK)
204 continue;
205 if (user_dev_name[0] ? !strcmp(dev->name, user_dev_name) :
206 (!(dev->flags & IFF_LOOPBACK) &&
207 (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) &&
208 strncmp(dev->name, "dummy", 5))) {
209 int able = 0;
210 if (dev->mtu >= 364)
211 able |= IC_BOOTP;
212 else
213 printk(KERN_WARNING "DHCP/BOOTP: Ignoring device %s, MTU %d too small", dev->name, dev->mtu);
214 if (!(dev->flags & IFF_NOARP))
215 able |= IC_RARP;
216 able &= ic_proto_enabled;
217 if (ic_proto_enabled && !able)
218 continue;
219 oflags = dev->flags;
220 if (dev_change_flags(dev, oflags | IFF_UP) < 0) {
221 printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name);
222 continue;
223 }
224 if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) {
225 rtnl_unlock();
226 return -1;
227 }
228 d->dev = dev;
229 *last = d;
230 last = &d->next;
231 d->flags = oflags;
232 d->able = able;
233 if (able & IC_BOOTP)
234 get_random_bytes(&d->xid, sizeof(__be32));
235 else
236 d->xid = 0;
237 ic_proto_have_if |= able;
238 DBG(("IP-Config: %s UP (able=%d, xid=%08x)\n",
239 dev->name, able, d->xid));
240 }
241 }
242 rtnl_unlock();
243
244 *last = NULL;
245
246 if (!ic_first_dev) {
247 if (user_dev_name[0])
248 printk(KERN_ERR "IP-Config: Device `%s' not found.\n", user_dev_name);
249 else
250 printk(KERN_ERR "IP-Config: No network devices available.\n");
251 return -1;
252 }
253 return 0;
254 }
255
256 static void __init ic_close_devs(void)
257 {
258 struct ic_device *d, *next;
259 struct net_device *dev;
260
261 rtnl_lock();
262 next = ic_first_dev;
263 while ((d = next)) {
264 next = d->next;
265 dev = d->dev;
266 if (dev != ic_dev) {
267 DBG(("IP-Config: Downing %s\n", dev->name));
268 dev_change_flags(dev, d->flags);
269 }
270 kfree(d);
271 }
272 rtnl_unlock();
273 }
274
275 /*
276 * Interface to various network functions.
277 */
278
279 static inline void
280 set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port)
281 {
282 sin->sin_family = AF_INET;
283 sin->sin_addr.s_addr = addr;
284 sin->sin_port = port;
285 }
286
287 static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg)
288 {
289 int res;
290
291 mm_segment_t oldfs = get_fs();
292 set_fs(get_ds());
293 res = devinet_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
294 set_fs(oldfs);
295 return res;
296 }
297
298 static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg)
299 {
300 int res;
301
302 mm_segment_t oldfs = get_fs();
303 set_fs(get_ds());
304 res = ip_rt_ioctl(&init_net, cmd, (void __user *) arg);
305 set_fs(oldfs);
306 return res;
307 }
308
309 /*
310 * Set up interface addresses and routes.
311 */
312
313 static int __init ic_setup_if(void)
314 {
315 struct ifreq ir;
316 struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr;
317 int err;
318
319 memset(&ir, 0, sizeof(ir));
320 strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name);
321 set_sockaddr(sin, ic_myaddr, 0);
322 if ((err = ic_dev_ioctl(SIOCSIFADDR, &ir)) < 0) {
323 printk(KERN_ERR "IP-Config: Unable to set interface address (%d).\n", err);
324 return -1;
325 }
326 set_sockaddr(sin, ic_netmask, 0);
327 if ((err = ic_dev_ioctl(SIOCSIFNETMASK, &ir)) < 0) {
328 printk(KERN_ERR "IP-Config: Unable to set interface netmask (%d).\n", err);
329 return -1;
330 }
331 set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0);
332 if ((err = ic_dev_ioctl(SIOCSIFBRDADDR, &ir)) < 0) {
333 printk(KERN_ERR "IP-Config: Unable to set interface broadcast address (%d).\n", err);
334 return -1;
335 }
336 return 0;
337 }
338
339 static int __init ic_setup_routes(void)
340 {
341 /* No need to setup device routes, only the default route... */
342
343 if (ic_gateway != NONE) {
344 struct rtentry rm;
345 int err;
346
347 memset(&rm, 0, sizeof(rm));
348 if ((ic_gateway ^ ic_myaddr) & ic_netmask) {
349 printk(KERN_ERR "IP-Config: Gateway not on directly connected network.\n");
350 return -1;
351 }
352 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0);
353 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0);
354 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0);
355 rm.rt_flags = RTF_UP | RTF_GATEWAY;
356 if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) {
357 printk(KERN_ERR "IP-Config: Cannot add default route (%d).\n", err);
358 return -1;
359 }
360 }
361
362 return 0;
363 }
364
365 /*
366 * Fill in default values for all missing parameters.
367 */
368
369 static int __init ic_defaults(void)
370 {
371 /*
372 * At this point we have no userspace running so need not
373 * claim locks on system_utsname
374 */
375
376 if (!ic_host_name_set)
377 sprintf(init_utsname()->nodename, NIPQUAD_FMT, NIPQUAD(ic_myaddr));
378
379 if (root_server_addr == NONE)
380 root_server_addr = ic_servaddr;
381
382 if (ic_netmask == NONE) {
383 if (IN_CLASSA(ntohl(ic_myaddr)))
384 ic_netmask = htonl(IN_CLASSA_NET);
385 else if (IN_CLASSB(ntohl(ic_myaddr)))
386 ic_netmask = htonl(IN_CLASSB_NET);
387 else if (IN_CLASSC(ntohl(ic_myaddr)))
388 ic_netmask = htonl(IN_CLASSC_NET);
389 else {
390 printk(KERN_ERR "IP-Config: Unable to guess netmask for address " NIPQUAD_FMT "\n",
391 NIPQUAD(ic_myaddr));
392 return -1;
393 }
394 printk("IP-Config: Guessing netmask " NIPQUAD_FMT "\n", NIPQUAD(ic_netmask));
395 }
396
397 return 0;
398 }
399
400 /*
401 * RARP support.
402 */
403
404 #ifdef IPCONFIG_RARP
405
406 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
407
408 static struct packet_type rarp_packet_type __initdata = {
409 .type = __constant_htons(ETH_P_RARP),
410 .func = ic_rarp_recv,
411 };
412
413 static inline void __init ic_rarp_init(void)
414 {
415 dev_add_pack(&rarp_packet_type);
416 }
417
418 static inline void __init ic_rarp_cleanup(void)
419 {
420 dev_remove_pack(&rarp_packet_type);
421 }
422
423 /*
424 * Process received RARP packet.
425 */
426 static int __init
427 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
428 {
429 struct arphdr *rarp;
430 unsigned char *rarp_ptr;
431 __be32 sip, tip;
432 unsigned char *sha, *tha; /* s for "source", t for "target" */
433 struct ic_device *d;
434
435 if (!net_eq(dev_net(dev), &init_net))
436 goto drop;
437
438 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
439 return NET_RX_DROP;
440
441 if (!pskb_may_pull(skb, sizeof(struct arphdr)))
442 goto drop;
443
444 /* Basic sanity checks can be done without the lock. */
445 rarp = (struct arphdr *)skb_transport_header(skb);
446
447 /* If this test doesn't pass, it's not IP, or we should
448 * ignore it anyway.
449 */
450 if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd))
451 goto drop;
452
453 /* If it's not a RARP reply, delete it. */
454 if (rarp->ar_op != htons(ARPOP_RREPLY))
455 goto drop;
456
457 /* If it's not Ethernet, delete it. */
458 if (rarp->ar_pro != htons(ETH_P_IP))
459 goto drop;
460
461 if (!pskb_may_pull(skb, arp_hdr_len(dev)))
462 goto drop;
463
464 /* OK, it is all there and looks valid, process... */
465 rarp = (struct arphdr *)skb_transport_header(skb);
466 rarp_ptr = (unsigned char *) (rarp + 1);
467
468 /* One reply at a time, please. */
469 spin_lock(&ic_recv_lock);
470
471 /* If we already have a reply, just drop the packet */
472 if (ic_got_reply)
473 goto drop_unlock;
474
475 /* Find the ic_device that the packet arrived on */
476 d = ic_first_dev;
477 while (d && d->dev != dev)
478 d = d->next;
479 if (!d)
480 goto drop_unlock; /* should never happen */
481
482 /* Extract variable-width fields */
483 sha = rarp_ptr;
484 rarp_ptr += dev->addr_len;
485 memcpy(&sip, rarp_ptr, 4);
486 rarp_ptr += 4;
487 tha = rarp_ptr;
488 rarp_ptr += dev->addr_len;
489 memcpy(&tip, rarp_ptr, 4);
490
491 /* Discard packets which are not meant for us. */
492 if (memcmp(tha, dev->dev_addr, dev->addr_len))
493 goto drop_unlock;
494
495 /* Discard packets which are not from specified server. */
496 if (ic_servaddr != NONE && ic_servaddr != sip)
497 goto drop_unlock;
498
499 /* We have a winner! */
500 ic_dev = dev;
501 if (ic_myaddr == NONE)
502 ic_myaddr = tip;
503 ic_servaddr = sip;
504 ic_got_reply = IC_RARP;
505
506 drop_unlock:
507 /* Show's over. Nothing to see here. */
508 spin_unlock(&ic_recv_lock);
509
510 drop:
511 /* Throw the packet out. */
512 kfree_skb(skb);
513 return 0;
514 }
515
516
517 /*
518 * Send RARP request packet over a single interface.
519 */
520 static void __init ic_rarp_send_if(struct ic_device *d)
521 {
522 struct net_device *dev = d->dev;
523 arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL,
524 dev->dev_addr, dev->dev_addr);
525 }
526 #endif
527
528 /*
529 * DHCP/BOOTP support.
530 */
531
532 #ifdef IPCONFIG_BOOTP
533
534 struct bootp_pkt { /* BOOTP packet format */
535 struct iphdr iph; /* IP header */
536 struct udphdr udph; /* UDP header */
537 u8 op; /* 1=request, 2=reply */
538 u8 htype; /* HW address type */
539 u8 hlen; /* HW address length */
540 u8 hops; /* Used only by gateways */
541 __be32 xid; /* Transaction ID */
542 __be16 secs; /* Seconds since we started */
543 __be16 flags; /* Just what it says */
544 __be32 client_ip; /* Client's IP address if known */
545 __be32 your_ip; /* Assigned IP address */
546 __be32 server_ip; /* (Next, e.g. NFS) Server's IP address */
547 __be32 relay_ip; /* IP address of BOOTP relay */
548 u8 hw_addr[16]; /* Client's HW address */
549 u8 serv_name[64]; /* Server host name */
550 u8 boot_file[128]; /* Name of boot file */
551 u8 exten[312]; /* DHCP options / BOOTP vendor extensions */
552 };
553
554 /* packet ops */
555 #define BOOTP_REQUEST 1
556 #define BOOTP_REPLY 2
557
558 /* DHCP message types */
559 #define DHCPDISCOVER 1
560 #define DHCPOFFER 2
561 #define DHCPREQUEST 3
562 #define DHCPDECLINE 4
563 #define DHCPACK 5
564 #define DHCPNAK 6
565 #define DHCPRELEASE 7
566 #define DHCPINFORM 8
567
568 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
569
570 static struct packet_type bootp_packet_type __initdata = {
571 .type = __constant_htons(ETH_P_IP),
572 .func = ic_bootp_recv,
573 };
574
575
576 /*
577 * Initialize DHCP/BOOTP extension fields in the request.
578 */
579
580 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 };
581
582 #ifdef IPCONFIG_DHCP
583
584 static void __init
585 ic_dhcp_init_options(u8 *options)
586 {
587 u8 mt = ((ic_servaddr == NONE)
588 ? DHCPDISCOVER : DHCPREQUEST);
589 u8 *e = options;
590 int len;
591
592 #ifdef IPCONFIG_DEBUG
593 printk("DHCP: Sending message type %d\n", mt);
594 #endif
595
596 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */
597 e += 4;
598
599 *e++ = 53; /* DHCP message type */
600 *e++ = 1;
601 *e++ = mt;
602
603 if (mt == DHCPREQUEST) {
604 *e++ = 54; /* Server ID (IP address) */
605 *e++ = 4;
606 memcpy(e, &ic_servaddr, 4);
607 e += 4;
608
609 *e++ = 50; /* Requested IP address */
610 *e++ = 4;
611 memcpy(e, &ic_myaddr, 4);
612 e += 4;
613 }
614
615 /* always? */
616 {
617 static const u8 ic_req_params[] = {
618 1, /* Subnet mask */
619 3, /* Default gateway */
620 6, /* DNS server */
621 12, /* Host name */
622 15, /* Domain name */
623 17, /* Boot path */
624 40, /* NIS domain name */
625 };
626
627 *e++ = 55; /* Parameter request list */
628 *e++ = sizeof(ic_req_params);
629 memcpy(e, ic_req_params, sizeof(ic_req_params));
630 e += sizeof(ic_req_params);
631
632 if (*vendor_class_identifier) {
633 printk(KERN_INFO "DHCP: sending class identifier \"%s\"\n",
634 vendor_class_identifier);
635 *e++ = 60; /* Class-identifier */
636 len = strlen(vendor_class_identifier);
637 *e++ = len;
638 memcpy(e, vendor_class_identifier, len);
639 e += len;
640 }
641 }
642
643 *e++ = 255; /* End of the list */
644 }
645
646 #endif /* IPCONFIG_DHCP */
647
648 static void __init ic_bootp_init_ext(u8 *e)
649 {
650 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */
651 e += 4;
652 *e++ = 1; /* Subnet mask request */
653 *e++ = 4;
654 e += 4;
655 *e++ = 3; /* Default gateway request */
656 *e++ = 4;
657 e += 4;
658 *e++ = 5; /* Name server request */
659 *e++ = 8;
660 e += 8;
661 *e++ = 12; /* Host name request */
662 *e++ = 32;
663 e += 32;
664 *e++ = 40; /* NIS Domain name request */
665 *e++ = 32;
666 e += 32;
667 *e++ = 17; /* Boot path */
668 *e++ = 40;
669 e += 40;
670
671 *e++ = 57; /* set extension buffer size for reply */
672 *e++ = 2;
673 *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */
674 *e++ = 150;
675
676 *e++ = 255; /* End of the list */
677 }
678
679
680 /*
681 * Initialize the DHCP/BOOTP mechanism.
682 */
683 static inline void __init ic_bootp_init(void)
684 {
685 int i;
686
687 for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
688 ic_nameservers[i] = NONE;
689
690 dev_add_pack(&bootp_packet_type);
691 }
692
693
694 /*
695 * DHCP/BOOTP cleanup.
696 */
697 static inline void __init ic_bootp_cleanup(void)
698 {
699 dev_remove_pack(&bootp_packet_type);
700 }
701
702
703 /*
704 * Send DHCP/BOOTP request to single interface.
705 */
706 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff)
707 {
708 struct net_device *dev = d->dev;
709 struct sk_buff *skb;
710 struct bootp_pkt *b;
711 struct iphdr *h;
712
713 /* Allocate packet */
714 skb = alloc_skb(sizeof(struct bootp_pkt) + LL_ALLOCATED_SPACE(dev) + 15,
715 GFP_KERNEL);
716 if (!skb)
717 return;
718 skb_reserve(skb, LL_RESERVED_SPACE(dev));
719 b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt));
720 memset(b, 0, sizeof(struct bootp_pkt));
721
722 /* Construct IP header */
723 skb_reset_network_header(skb);
724 h = ip_hdr(skb);
725 h->version = 4;
726 h->ihl = 5;
727 h->tot_len = htons(sizeof(struct bootp_pkt));
728 h->frag_off = htons(IP_DF);
729 h->ttl = 64;
730 h->protocol = IPPROTO_UDP;
731 h->daddr = htonl(INADDR_BROADCAST);
732 h->check = ip_fast_csum((unsigned char *) h, h->ihl);
733
734 /* Construct UDP header */
735 b->udph.source = htons(68);
736 b->udph.dest = htons(67);
737 b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr));
738 /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */
739
740 /* Construct DHCP/BOOTP header */
741 b->op = BOOTP_REQUEST;
742 if (dev->type < 256) /* check for false types */
743 b->htype = dev->type;
744 else if (dev->type == ARPHRD_IEEE802_TR) /* fix for token ring */
745 b->htype = ARPHRD_IEEE802;
746 else if (dev->type == ARPHRD_FDDI)
747 b->htype = ARPHRD_ETHER;
748 else {
749 printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name);
750 b->htype = dev->type; /* can cause undefined behavior */
751 }
752
753 /* server_ip and your_ip address are both already zero per RFC2131 */
754 b->hlen = dev->addr_len;
755 memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
756 b->secs = htons(jiffies_diff / HZ);
757 b->xid = d->xid;
758
759 /* add DHCP options or BOOTP extensions */
760 #ifdef IPCONFIG_DHCP
761 if (ic_proto_enabled & IC_USE_DHCP)
762 ic_dhcp_init_options(b->exten);
763 else
764 #endif
765 ic_bootp_init_ext(b->exten);
766
767 /* Chain packet down the line... */
768 skb->dev = dev;
769 skb->protocol = htons(ETH_P_IP);
770 if (dev_hard_header(skb, dev, ntohs(skb->protocol),
771 dev->broadcast, dev->dev_addr, skb->len) < 0 ||
772 dev_queue_xmit(skb) < 0)
773 printk("E");
774 }
775
776
777 /*
778 * Copy BOOTP-supplied string if not already set.
779 */
780 static int __init ic_bootp_string(char *dest, char *src, int len, int max)
781 {
782 if (!len)
783 return 0;
784 if (len > max-1)
785 len = max-1;
786 memcpy(dest, src, len);
787 dest[len] = '\0';
788 return 1;
789 }
790
791
792 /*
793 * Process BOOTP extensions.
794 */
795 static void __init ic_do_bootp_ext(u8 *ext)
796 {
797 u8 servers;
798 int i;
799
800 #ifdef IPCONFIG_DEBUG
801 u8 *c;
802
803 printk("DHCP/BOOTP: Got extension %d:",*ext);
804 for (c=ext+2; c<ext+2+ext[1]; c++)
805 printk(" %02x", *c);
806 printk("\n");
807 #endif
808
809 switch (*ext++) {
810 case 1: /* Subnet mask */
811 if (ic_netmask == NONE)
812 memcpy(&ic_netmask, ext+1, 4);
813 break;
814 case 3: /* Default gateway */
815 if (ic_gateway == NONE)
816 memcpy(&ic_gateway, ext+1, 4);
817 break;
818 case 6: /* DNS server */
819 servers= *ext/4;
820 if (servers > CONF_NAMESERVERS_MAX)
821 servers = CONF_NAMESERVERS_MAX;
822 for (i = 0; i < servers; i++) {
823 if (ic_nameservers[i] == NONE)
824 memcpy(&ic_nameservers[i], ext+1+4*i, 4);
825 }
826 break;
827 case 12: /* Host name */
828 ic_bootp_string(utsname()->nodename, ext+1, *ext, __NEW_UTS_LEN);
829 ic_host_name_set = 1;
830 break;
831 case 15: /* Domain name (DNS) */
832 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
833 break;
834 case 17: /* Root path */
835 if (!root_server_path[0])
836 ic_bootp_string(root_server_path, ext+1, *ext, sizeof(root_server_path));
837 break;
838 case 40: /* NIS Domain name (_not_ DNS) */
839 ic_bootp_string(utsname()->domainname, ext+1, *ext, __NEW_UTS_LEN);
840 break;
841 }
842 }
843
844
845 /*
846 * Receive BOOTP reply.
847 */
848 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
849 {
850 struct bootp_pkt *b;
851 struct iphdr *h;
852 struct ic_device *d;
853 int len, ext_len;
854
855 if (!net_eq(dev_net(dev), &init_net))
856 goto drop;
857
858 /* Perform verifications before taking the lock. */
859 if (skb->pkt_type == PACKET_OTHERHOST)
860 goto drop;
861
862 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
863 return NET_RX_DROP;
864
865 if (!pskb_may_pull(skb,
866 sizeof(struct iphdr) +
867 sizeof(struct udphdr)))
868 goto drop;
869
870 b = (struct bootp_pkt *)skb_network_header(skb);
871 h = &b->iph;
872
873 if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP)
874 goto drop;
875
876 /* Fragments are not supported */
877 if (h->frag_off & htons(IP_OFFSET | IP_MF)) {
878 if (net_ratelimit())
879 printk(KERN_ERR "DHCP/BOOTP: Ignoring fragmented "
880 "reply.\n");
881 goto drop;
882 }
883
884 if (skb->len < ntohs(h->tot_len))
885 goto drop;
886
887 if (ip_fast_csum((char *) h, h->ihl))
888 goto drop;
889
890 if (b->udph.source != htons(67) || b->udph.dest != htons(68))
891 goto drop;
892
893 if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
894 goto drop;
895
896 len = ntohs(b->udph.len) - sizeof(struct udphdr);
897 ext_len = len - (sizeof(*b) -
898 sizeof(struct iphdr) -
899 sizeof(struct udphdr) -
900 sizeof(b->exten));
901 if (ext_len < 0)
902 goto drop;
903
904 /* Ok the front looks good, make sure we can get at the rest. */
905 if (!pskb_may_pull(skb, skb->len))
906 goto drop;
907
908 b = (struct bootp_pkt *)skb_network_header(skb);
909 h = &b->iph;
910
911 /* One reply at a time, please. */
912 spin_lock(&ic_recv_lock);
913
914 /* If we already have a reply, just drop the packet */
915 if (ic_got_reply)
916 goto drop_unlock;
917
918 /* Find the ic_device that the packet arrived on */
919 d = ic_first_dev;
920 while (d && d->dev != dev)
921 d = d->next;
922 if (!d)
923 goto drop_unlock; /* should never happen */
924
925 /* Is it a reply to our BOOTP request? */
926 if (b->op != BOOTP_REPLY ||
927 b->xid != d->xid) {
928 if (net_ratelimit())
929 printk(KERN_ERR "DHCP/BOOTP: Reply not for us, "
930 "op[%x] xid[%x]\n",
931 b->op, b->xid);
932 goto drop_unlock;
933 }
934
935 /* Parse extensions */
936 if (ext_len >= 4 &&
937 !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */
938 u8 *end = (u8 *) b + ntohs(b->iph.tot_len);
939 u8 *ext;
940
941 #ifdef IPCONFIG_DHCP
942 if (ic_proto_enabled & IC_USE_DHCP) {
943 __be32 server_id = NONE;
944 int mt = 0;
945
946 ext = &b->exten[4];
947 while (ext < end && *ext != 0xff) {
948 u8 *opt = ext++;
949 if (*opt == 0) /* Padding */
950 continue;
951 ext += *ext + 1;
952 if (ext >= end)
953 break;
954 switch (*opt) {
955 case 53: /* Message type */
956 if (opt[1])
957 mt = opt[2];
958 break;
959 case 54: /* Server ID (IP address) */
960 if (opt[1] >= 4)
961 memcpy(&server_id, opt + 2, 4);
962 break;
963 }
964 }
965
966 #ifdef IPCONFIG_DEBUG
967 printk("DHCP: Got message type %d\n", mt);
968 #endif
969
970 switch (mt) {
971 case DHCPOFFER:
972 /* While in the process of accepting one offer,
973 * ignore all others.
974 */
975 if (ic_myaddr != NONE)
976 goto drop_unlock;
977
978 /* Let's accept that offer. */
979 ic_myaddr = b->your_ip;
980 ic_servaddr = server_id;
981 #ifdef IPCONFIG_DEBUG
982 printk("DHCP: Offered address " NIPQUAD_FMT,
983 NIPQUAD(ic_myaddr));
984 printk(" by server " NIPQUAD_FMT "\n",
985 NIPQUAD(ic_servaddr));
986 #endif
987 /* The DHCP indicated server address takes
988 * precedence over the bootp header one if
989 * they are different.
990 */
991 if ((server_id != NONE) &&
992 (b->server_ip != server_id))
993 b->server_ip = ic_servaddr;
994 break;
995
996 case DHCPACK:
997 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0)
998 goto drop_unlock;
999
1000 /* Yeah! */
1001 break;
1002
1003 default:
1004 /* Urque. Forget it*/
1005 ic_myaddr = NONE;
1006 ic_servaddr = NONE;
1007 goto drop_unlock;
1008 }
1009
1010 ic_dhcp_msgtype = mt;
1011
1012 }
1013 #endif /* IPCONFIG_DHCP */
1014
1015 ext = &b->exten[4];
1016 while (ext < end && *ext != 0xff) {
1017 u8 *opt = ext++;
1018 if (*opt == 0) /* Padding */
1019 continue;
1020 ext += *ext + 1;
1021 if (ext < end)
1022 ic_do_bootp_ext(opt);
1023 }
1024 }
1025
1026 /* We have a winner! */
1027 ic_dev = dev;
1028 ic_myaddr = b->your_ip;
1029 ic_servaddr = b->server_ip;
1030 if (ic_gateway == NONE && b->relay_ip)
1031 ic_gateway = b->relay_ip;
1032 if (ic_nameservers[0] == NONE)
1033 ic_nameservers[0] = ic_servaddr;
1034 ic_got_reply = IC_BOOTP;
1035
1036 drop_unlock:
1037 /* Show's over. Nothing to see here. */
1038 spin_unlock(&ic_recv_lock);
1039
1040 drop:
1041 /* Throw the packet out. */
1042 kfree_skb(skb);
1043
1044 return 0;
1045 }
1046
1047
1048 #endif
1049
1050
1051 /*
1052 * Dynamic IP configuration -- DHCP, BOOTP, RARP.
1053 */
1054
1055 #ifdef IPCONFIG_DYNAMIC
1056
1057 static int __init ic_dynamic(void)
1058 {
1059 int retries;
1060 struct ic_device *d;
1061 unsigned long start_jiffies, timeout, jiff;
1062 int do_bootp = ic_proto_have_if & IC_BOOTP;
1063 int do_rarp = ic_proto_have_if & IC_RARP;
1064
1065 /*
1066 * If none of DHCP/BOOTP/RARP was selected, return with an error.
1067 * This routine gets only called when some pieces of information
1068 * are missing, and without DHCP/BOOTP/RARP we are unable to get it.
1069 */
1070 if (!ic_proto_enabled) {
1071 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
1072 return -1;
1073 }
1074
1075 #ifdef IPCONFIG_BOOTP
1076 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
1077 printk(KERN_ERR "DHCP/BOOTP: No suitable device found.\n");
1078 #endif
1079 #ifdef IPCONFIG_RARP
1080 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)
1081 printk(KERN_ERR "RARP: No suitable device found.\n");
1082 #endif
1083
1084 if (!ic_proto_have_if)
1085 /* Error message already printed */
1086 return -1;
1087
1088 /*
1089 * Setup protocols
1090 */
1091 #ifdef IPCONFIG_BOOTP
1092 if (do_bootp)
1093 ic_bootp_init();
1094 #endif
1095 #ifdef IPCONFIG_RARP
1096 if (do_rarp)
1097 ic_rarp_init();
1098 #endif
1099
1100 /*
1101 * Send requests and wait, until we get an answer. This loop
1102 * seems to be a terrible waste of CPU time, but actually there is
1103 * only one process running at all, so we don't need to use any
1104 * scheduler functions.
1105 * [Actually we could now, but the nothing else running note still
1106 * applies.. - AC]
1107 */
1108 printk(KERN_NOTICE "Sending %s%s%s requests .",
1109 do_bootp
1110 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "",
1111 (do_bootp && do_rarp) ? " and " : "",
1112 do_rarp ? "RARP" : "");
1113
1114 start_jiffies = jiffies;
1115 d = ic_first_dev;
1116 retries = CONF_SEND_RETRIES;
1117 get_random_bytes(&timeout, sizeof(timeout));
1118 timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned) CONF_TIMEOUT_RANDOM);
1119 for (;;) {
1120 #ifdef IPCONFIG_BOOTP
1121 if (do_bootp && (d->able & IC_BOOTP))
1122 ic_bootp_send_if(d, jiffies - start_jiffies);
1123 #endif
1124 #ifdef IPCONFIG_RARP
1125 if (do_rarp && (d->able & IC_RARP))
1126 ic_rarp_send_if(d);
1127 #endif
1128
1129 jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout);
1130 while (time_before(jiffies, jiff) && !ic_got_reply)
1131 schedule_timeout_uninterruptible(1);
1132 #ifdef IPCONFIG_DHCP
1133 /* DHCP isn't done until we get a DHCPACK. */
1134 if ((ic_got_reply & IC_BOOTP)
1135 && (ic_proto_enabled & IC_USE_DHCP)
1136 && ic_dhcp_msgtype != DHCPACK)
1137 {
1138 ic_got_reply = 0;
1139 printk(",");
1140 continue;
1141 }
1142 #endif /* IPCONFIG_DHCP */
1143
1144 if (ic_got_reply) {
1145 printk(" OK\n");
1146 break;
1147 }
1148
1149 if ((d = d->next))
1150 continue;
1151
1152 if (! --retries) {
1153 printk(" timed out!\n");
1154 break;
1155 }
1156
1157 d = ic_first_dev;
1158
1159 timeout = timeout CONF_TIMEOUT_MULT;
1160 if (timeout > CONF_TIMEOUT_MAX)
1161 timeout = CONF_TIMEOUT_MAX;
1162
1163 printk(".");
1164 }
1165
1166 #ifdef IPCONFIG_BOOTP
1167 if (do_bootp)
1168 ic_bootp_cleanup();
1169 #endif
1170 #ifdef IPCONFIG_RARP
1171 if (do_rarp)
1172 ic_rarp_cleanup();
1173 #endif
1174
1175 if (!ic_got_reply) {
1176 ic_myaddr = NONE;
1177 return -1;
1178 }
1179
1180 printk("IP-Config: Got %s answer from " NIPQUAD_FMT ", ",
1181 ((ic_got_reply & IC_RARP) ? "RARP"
1182 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),
1183 NIPQUAD(ic_servaddr));
1184 printk("my address is " NIPQUAD_FMT "\n", NIPQUAD(ic_myaddr));
1185
1186 return 0;
1187 }
1188
1189 #endif /* IPCONFIG_DYNAMIC */
1190
1191 #ifdef CONFIG_PROC_FS
1192
1193 static int pnp_seq_show(struct seq_file *seq, void *v)
1194 {
1195 int i;
1196
1197 if (ic_proto_used & IC_PROTO)
1198 seq_printf(seq, "#PROTO: %s\n",
1199 (ic_proto_used & IC_RARP) ? "RARP"
1200 : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP");
1201 else
1202 seq_puts(seq, "#MANUAL\n");
1203
1204 if (ic_domain[0])
1205 seq_printf(seq,
1206 "domain %s\n", ic_domain);
1207 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {
1208 if (ic_nameservers[i] != NONE)
1209 seq_printf(seq,
1210 "nameserver " NIPQUAD_FMT "\n",
1211 NIPQUAD(ic_nameservers[i]));
1212 }
1213 if (ic_servaddr != NONE)
1214 seq_printf(seq,
1215 "bootserver " NIPQUAD_FMT "\n",
1216 NIPQUAD(ic_servaddr));
1217 return 0;
1218 }
1219
1220 static int pnp_seq_open(struct inode *indoe, struct file *file)
1221 {
1222 return single_open(file, pnp_seq_show, NULL);
1223 }
1224
1225 static const struct file_operations pnp_seq_fops = {
1226 .owner = THIS_MODULE,
1227 .open = pnp_seq_open,
1228 .read = seq_read,
1229 .llseek = seq_lseek,
1230 .release = single_release,
1231 };
1232 #endif /* CONFIG_PROC_FS */
1233
1234 /*
1235 * Extract IP address from the parameter string if needed. Note that we
1236 * need to have root_server_addr set _before_ IPConfig gets called as it
1237 * can override it.
1238 */
1239 __be32 __init root_nfs_parse_addr(char *name)
1240 {
1241 __be32 addr;
1242 int octets = 0;
1243 char *cp, *cq;
1244
1245 cp = cq = name;
1246 while (octets < 4) {
1247 while (*cp >= '0' && *cp <= '9')
1248 cp++;
1249 if (cp == cq || cp - cq > 3)
1250 break;
1251 if (*cp == '.' || octets == 3)
1252 octets++;
1253 if (octets < 4)
1254 cp++;
1255 cq = cp;
1256 }
1257 if (octets == 4 && (*cp == ':' || *cp == '\0')) {
1258 if (*cp == ':')
1259 *cp++ = '\0';
1260 addr = in_aton(name);
1261 memmove(name, cp, strlen(cp) + 1);
1262 } else
1263 addr = NONE;
1264
1265 return addr;
1266 }
1267
1268 /*
1269 * IP Autoconfig dispatcher.
1270 */
1271
1272 static int __init ip_auto_config(void)
1273 {
1274 __be32 addr;
1275
1276 #ifdef CONFIG_PROC_FS
1277 proc_net_fops_create(&init_net, "pnp", S_IRUGO, &pnp_seq_fops);
1278 #endif /* CONFIG_PROC_FS */
1279
1280 if (!ic_enable)
1281 return 0;
1282
1283 DBG(("IP-Config: Entered.\n"));
1284 #ifdef IPCONFIG_DYNAMIC
1285 try_try_again:
1286 #endif
1287 /* Give hardware a chance to settle */
1288 msleep(CONF_PRE_OPEN);
1289
1290 /* Setup all network devices */
1291 if (ic_open_devs() < 0)
1292 return -1;
1293
1294 /* Give drivers a chance to settle */
1295 ssleep(CONF_POST_OPEN);
1296
1297 /*
1298 * If the config information is insufficient (e.g., our IP address or
1299 * IP address of the boot server is missing or we have multiple network
1300 * interfaces and no default was set), use BOOTP or RARP to get the
1301 * missing values.
1302 */
1303 if (ic_myaddr == NONE ||
1304 #ifdef CONFIG_ROOT_NFS
1305 (root_server_addr == NONE
1306 && ic_servaddr == NONE
1307 && ROOT_DEV == Root_NFS) ||
1308 #endif
1309 ic_first_dev->next) {
1310 #ifdef IPCONFIG_DYNAMIC
1311
1312 int retries = CONF_OPEN_RETRIES;
1313
1314 if (ic_dynamic() < 0) {
1315 ic_close_devs();
1316
1317 /*
1318 * I don't know why, but sometimes the
1319 * eepro100 driver (at least) gets upset and
1320 * doesn't work the first time it's opened.
1321 * But then if you close it and reopen it, it
1322 * works just fine. So we need to try that at
1323 * least once before giving up.
1324 *
1325 * Also, if the root will be NFS-mounted, we
1326 * have nowhere to go if DHCP fails. So we
1327 * just have to keep trying forever.
1328 *
1329 * -- Chip
1330 */
1331 #ifdef CONFIG_ROOT_NFS
1332 if (ROOT_DEV == Root_NFS) {
1333 printk(KERN_ERR
1334 "IP-Config: Retrying forever (NFS root)...\n");
1335 goto try_try_again;
1336 }
1337 #endif
1338
1339 if (--retries) {
1340 printk(KERN_ERR
1341 "IP-Config: Reopening network devices...\n");
1342 goto try_try_again;
1343 }
1344
1345 /* Oh, well. At least we tried. */
1346 printk(KERN_ERR "IP-Config: Auto-configuration of network failed.\n");
1347 return -1;
1348 }
1349 #else /* !DYNAMIC */
1350 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
1351 ic_close_devs();
1352 return -1;
1353 #endif /* IPCONFIG_DYNAMIC */
1354 } else {
1355 /* Device selected manually or only one device -> use it */
1356 ic_dev = ic_first_dev->dev;
1357 }
1358
1359 addr = root_nfs_parse_addr(root_server_path);
1360 if (root_server_addr == NONE)
1361 root_server_addr = addr;
1362
1363 /*
1364 * Use defaults whereever applicable.
1365 */
1366 if (ic_defaults() < 0)
1367 return -1;
1368
1369 /*
1370 * Close all network devices except the device we've
1371 * autoconfigured and set up routes.
1372 */
1373 ic_close_devs();
1374 if (ic_setup_if() < 0 || ic_setup_routes() < 0)
1375 return -1;
1376
1377 /*
1378 * Record which protocol was actually used.
1379 */
1380 #ifdef IPCONFIG_DYNAMIC
1381 ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP);
1382 #endif
1383
1384 #ifndef IPCONFIG_SILENT
1385 /*
1386 * Clue in the operator.
1387 */
1388 printk("IP-Config: Complete:");
1389 printk("\n device=%s", ic_dev->name);
1390 printk(", addr=" NIPQUAD_FMT, NIPQUAD(ic_myaddr));
1391 printk(", mask=" NIPQUAD_FMT, NIPQUAD(ic_netmask));
1392 printk(", gw=" NIPQUAD_FMT, NIPQUAD(ic_gateway));
1393 printk(",\n host=%s, domain=%s, nis-domain=%s",
1394 utsname()->nodename, ic_domain, utsname()->domainname);
1395 printk(",\n bootserver=" NIPQUAD_FMT, NIPQUAD(ic_servaddr));
1396 printk(", rootserver=" NIPQUAD_FMT, NIPQUAD(root_server_addr));
1397 printk(", rootpath=%s", root_server_path);
1398 printk("\n");
1399 #endif /* !SILENT */
1400
1401 return 0;
1402 }
1403
1404 late_initcall(ip_auto_config);
1405
1406
1407 /*
1408 * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
1409 * command line parameter. See Documentation/filesystems/nfsroot.txt.
1410 */
1411 static int __init ic_proto_name(char *name)
1412 {
1413 if (!strcmp(name, "on") || !strcmp(name, "any")) {
1414 return 1;
1415 }
1416 if (!strcmp(name, "off") || !strcmp(name, "none")) {
1417 return 0;
1418 }
1419 #ifdef CONFIG_IP_PNP_DHCP
1420 else if (!strcmp(name, "dhcp")) {
1421 ic_proto_enabled &= ~IC_RARP;
1422 return 1;
1423 }
1424 #endif
1425 #ifdef CONFIG_IP_PNP_BOOTP
1426 else if (!strcmp(name, "bootp")) {
1427 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP);
1428 return 1;
1429 }
1430 #endif
1431 #ifdef CONFIG_IP_PNP_RARP
1432 else if (!strcmp(name, "rarp")) {
1433 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP);
1434 return 1;
1435 }
1436 #endif
1437 #ifdef IPCONFIG_DYNAMIC
1438 else if (!strcmp(name, "both")) {
1439 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */
1440 return 1;
1441 }
1442 #endif
1443 return 0;
1444 }
1445
1446 static int __init ip_auto_config_setup(char *addrs)
1447 {
1448 char *cp, *ip, *dp;
1449 int num = 0;
1450
1451 ic_set_manually = 1;
1452 ic_enable = 1;
1453
1454 /*
1455 * If any dhcp, bootp etc options are set, leave autoconfig on
1456 * and skip the below static IP processing.
1457 */
1458 if (ic_proto_name(addrs))
1459 return 1;
1460
1461 /* If no static IP is given, turn off autoconfig and bail. */
1462 if (*addrs == 0 ||
1463 strcmp(addrs, "off") == 0 ||
1464 strcmp(addrs, "none") == 0) {
1465 ic_enable = 0;
1466 return 1;
1467 }
1468
1469 /* Parse string for static IP assignment. */
1470 ip = addrs;
1471 while (ip && *ip) {
1472 if ((cp = strchr(ip, ':')))
1473 *cp++ = '\0';
1474 if (strlen(ip) > 0) {
1475 DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip));
1476 switch (num) {
1477 case 0:
1478 if ((ic_myaddr = in_aton(ip)) == ANY)
1479 ic_myaddr = NONE;
1480 break;
1481 case 1:
1482 if ((ic_servaddr = in_aton(ip)) == ANY)
1483 ic_servaddr = NONE;
1484 break;
1485 case 2:
1486 if ((ic_gateway = in_aton(ip)) == ANY)
1487 ic_gateway = NONE;
1488 break;
1489 case 3:
1490 if ((ic_netmask = in_aton(ip)) == ANY)
1491 ic_netmask = NONE;
1492 break;
1493 case 4:
1494 if ((dp = strchr(ip, '.'))) {
1495 *dp++ = '\0';
1496 strlcpy(utsname()->domainname, dp,
1497 sizeof(utsname()->domainname));
1498 }
1499 strlcpy(utsname()->nodename, ip,
1500 sizeof(utsname()->nodename));
1501 ic_host_name_set = 1;
1502 break;
1503 case 5:
1504 strlcpy(user_dev_name, ip, sizeof(user_dev_name));
1505 break;
1506 case 6:
1507 if (ic_proto_name(ip) == 0 &&
1508 ic_myaddr == NONE) {
1509 ic_enable = 0;
1510 }
1511 break;
1512 }
1513 }
1514 ip = cp;
1515 num++;
1516 }
1517
1518 return 1;
1519 }
1520
1521 static int __init nfsaddrs_config_setup(char *addrs)
1522 {
1523 return ip_auto_config_setup(addrs);
1524 }
1525
1526 static int __init vendor_class_identifier_setup(char *addrs)
1527 {
1528 if (strlcpy(vendor_class_identifier, addrs,
1529 sizeof(vendor_class_identifier))
1530 >= sizeof(vendor_class_identifier))
1531 printk(KERN_WARNING "DHCP: vendorclass too long, truncated to \"%s\"",
1532 vendor_class_identifier);
1533 return 1;
1534 }
1535
1536 __setup("ip=", ip_auto_config_setup);
1537 __setup("nfsaddrs=", nfsaddrs_config_setup);
1538 __setup("dhcpclass=", vendor_class_identifier_setup);
Linux kernel - Deliverables
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