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net: bpf_jit: fix divide by 0 generation
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / ipv4 / ipconfig.c
blob7fbcabafa29b43ab0cff0cd32bdfba616724e8fa
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 <linux/slab.h>
57 #include <net/net_namespace.h>
58 #include <net/arp.h>
59 #include <net/ip.h>
60 #include <net/ipconfig.h>
61 #include <net/route.h>
62
63 #include <asm/uaccess.h>
64 #include <net/checksum.h>
65 #include <asm/processor.h>
66
67 /* Define this to allow debugging output */
68 #undef IPCONFIG_DEBUG
69
70 #ifdef IPCONFIG_DEBUG
71 #define DBG(x) printk x
72 #else
73 #define DBG(x) do { } while(0)
74 #endif
75
76 #if defined(CONFIG_IP_PNP_DHCP)
77 #define IPCONFIG_DHCP
78 #endif
79 #if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_DHCP)
80 #define IPCONFIG_BOOTP
81 #endif
82 #if defined(CONFIG_IP_PNP_RARP)
83 #define IPCONFIG_RARP
84 #endif
85 #if defined(IPCONFIG_BOOTP) || defined(IPCONFIG_RARP)
86 #define IPCONFIG_DYNAMIC
87 #endif
88
89 /* Define the friendly delay before and after opening net devices */
90 #define CONF_POST_OPEN 10 /* After opening: 10 msecs */
91 #define CONF_CARRIER_TIMEOUT 120000 /* Wait for carrier timeout */
92
93 /* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */
94 #define CONF_OPEN_RETRIES 2 /* (Re)open devices twice */
95 #define CONF_SEND_RETRIES 6 /* Send six requests per open */
96 #define CONF_INTER_TIMEOUT (HZ/2) /* Inter-device timeout: 1/2 second */
97 #define CONF_BASE_TIMEOUT (HZ*2) /* Initial timeout: 2 seconds */
98 #define CONF_TIMEOUT_RANDOM (HZ) /* Maximum amount of randomization */
99 #define CONF_TIMEOUT_MULT *7/4 /* Rate of timeout growth */
100 #define CONF_TIMEOUT_MAX (HZ*30) /* Maximum allowed timeout */
101 #define CONF_NAMESERVERS_MAX 3 /* Maximum number of nameservers
102 - '3' from resolv.h */
103
104 #define NONE cpu_to_be32(INADDR_NONE)
105 #define ANY cpu_to_be32(INADDR_ANY)
106
107 /*
108 * Public IP configuration
109 */
110
111 /* This is used by platforms which might be able to set the ipconfig
112 * variables using firmware environment vars. If this is set, it will
113 * ignore such firmware variables.
114 */
115 int ic_set_manually __initdata = 0; /* IPconfig parameters set manually */
116
117 static int ic_enable __initdata = 0; /* IP config enabled? */
118
119 /* Protocol choice */
120 int ic_proto_enabled __initdata = 0
121 #ifdef IPCONFIG_BOOTP
122 | IC_BOOTP
123 #endif
124 #ifdef CONFIG_IP_PNP_DHCP
125 | IC_USE_DHCP
126 #endif
127 #ifdef IPCONFIG_RARP
128 | IC_RARP
129 #endif
130 ;
131
132 static int ic_host_name_set __initdata = 0; /* Host name set by us? */
133
134 __be32 ic_myaddr = NONE; /* My IP address */
135 static __be32 ic_netmask = NONE; /* Netmask for local subnet */
136 __be32 ic_gateway = NONE; /* Gateway IP address */
137
138 __be32 ic_servaddr = NONE; /* Boot server IP address */
139
140 __be32 root_server_addr = NONE; /* Address of NFS server */
141 u8 root_server_path[256] = { 0, }; /* Path to mount as root */
142
143 u32 ic_dev_xid; /* Device under configuration */
144
145 /* vendor class identifier */
146 static char vendor_class_identifier[253] __initdata;
147
148 /* Persistent data: */
149
150 static int ic_proto_used; /* Protocol used, if any */
151 static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */
152 static u8 ic_domain[64]; /* DNS (not NIS) domain name */
153
154 /*
155 * Private state.
156 */
157
158 /* Name of user-selected boot device */
159 static char user_dev_name[IFNAMSIZ] __initdata = { 0, };
160
161 /* Protocols supported by available interfaces */
162 static int ic_proto_have_if __initdata = 0;
163
164 /* MTU for boot device */
165 static int ic_dev_mtu __initdata = 0;
166
167 #ifdef IPCONFIG_DYNAMIC
168 static DEFINE_SPINLOCK(ic_recv_lock);
169 static volatile int ic_got_reply __initdata = 0; /* Proto(s) that replied */
170 #endif
171 #ifdef IPCONFIG_DHCP
172 static int ic_dhcp_msgtype __initdata = 0; /* DHCP msg type received */
173 #endif
174
175
176 /*
177 * Network devices
178 */
179
180 struct ic_device {
181 struct ic_device *next;
182 struct net_device *dev;
183 unsigned short flags;
184 short able;
185 __be32 xid;
186 };
187
188 static struct ic_device *ic_first_dev __initdata = NULL;/* List of open device */
189 static struct net_device *ic_dev __initdata = NULL; /* Selected device */
190
191 static bool __init ic_is_init_dev(struct net_device *dev)
192 {
193 if (dev->flags & IFF_LOOPBACK)
194 return false;
195 return 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 }
200
201 static int __init ic_open_devs(void)
202 {
203 struct ic_device *d, **last;
204 struct net_device *dev;
205 unsigned short oflags;
206 unsigned long start;
207
208 last = &ic_first_dev;
209 rtnl_lock();
210
211 /* bring loopback device up first */
212 for_each_netdev(&init_net, dev) {
213 if (!(dev->flags & IFF_LOOPBACK))
214 continue;
215 if (dev_change_flags(dev, dev->flags | IFF_UP) < 0)
216 printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name);
217 }
218
219 for_each_netdev(&init_net, dev) {
220 if (ic_is_init_dev(dev)) {
221 int able = 0;
222 if (dev->mtu >= 364)
223 able |= IC_BOOTP;
224 else
225 printk(KERN_WARNING "DHCP/BOOTP: Ignoring device %s, MTU %d too small", dev->name, dev->mtu);
226 if (!(dev->flags & IFF_NOARP))
227 able |= IC_RARP;
228 able &= ic_proto_enabled;
229 if (ic_proto_enabled && !able)
230 continue;
231 oflags = dev->flags;
232 if (dev_change_flags(dev, oflags | IFF_UP) < 0) {
233 printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name);
234 continue;
235 }
236 if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) {
237 rtnl_unlock();
238 return -ENOMEM;
239 }
240 d->dev = dev;
241 *last = d;
242 last = &d->next;
243 d->flags = oflags;
244 d->able = able;
245 if (able & IC_BOOTP)
246 get_random_bytes(&d->xid, sizeof(__be32));
247 else
248 d->xid = 0;
249 ic_proto_have_if |= able;
250 DBG(("IP-Config: %s UP (able=%d, xid=%08x)\n",
251 dev->name, able, d->xid));
252 }
253 }
254
255 /* no point in waiting if we could not bring up at least one device */
256 if (!ic_first_dev)
257 goto have_carrier;
258
259 /* wait for a carrier on at least one device */
260 start = jiffies;
261 while (jiffies - start < msecs_to_jiffies(CONF_CARRIER_TIMEOUT)) {
262 for_each_netdev(&init_net, dev)
263 if (ic_is_init_dev(dev) && netif_carrier_ok(dev))
264 goto have_carrier;
265
266 msleep(1);
267 }
268 have_carrier:
269 rtnl_unlock();
270
271 *last = NULL;
272
273 if (!ic_first_dev) {
274 if (user_dev_name[0])
275 printk(KERN_ERR "IP-Config: Device `%s' not found.\n", user_dev_name);
276 else
277 printk(KERN_ERR "IP-Config: No network devices available.\n");
278 return -ENODEV;
279 }
280 return 0;
281 }
282
283 static void __init ic_close_devs(void)
284 {
285 struct ic_device *d, *next;
286 struct net_device *dev;
287
288 rtnl_lock();
289 next = ic_first_dev;
290 while ((d = next)) {
291 next = d->next;
292 dev = d->dev;
293 if (dev != ic_dev) {
294 DBG(("IP-Config: Downing %s\n", dev->name));
295 dev_change_flags(dev, d->flags);
296 }
297 kfree(d);
298 }
299 rtnl_unlock();
300 }
301
302 /*
303 * Interface to various network functions.
304 */
305
306 static inline void
307 set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port)
308 {
309 sin->sin_family = AF_INET;
310 sin->sin_addr.s_addr = addr;
311 sin->sin_port = port;
312 }
313
314 static int __init ic_devinet_ioctl(unsigned int cmd, struct ifreq *arg)
315 {
316 int res;
317
318 mm_segment_t oldfs = get_fs();
319 set_fs(get_ds());
320 res = devinet_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
321 set_fs(oldfs);
322 return res;
323 }
324
325 static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg)
326 {
327 int res;
328
329 mm_segment_t oldfs = get_fs();
330 set_fs(get_ds());
331 res = dev_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
332 set_fs(oldfs);
333 return res;
334 }
335
336 static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg)
337 {
338 int res;
339
340 mm_segment_t oldfs = get_fs();
341 set_fs(get_ds());
342 res = ip_rt_ioctl(&init_net, cmd, (void __user *) arg);
343 set_fs(oldfs);
344 return res;
345 }
346
347 /*
348 * Set up interface addresses and routes.
349 */
350
351 static int __init ic_setup_if(void)
352 {
353 struct ifreq ir;
354 struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr;
355 int err;
356
357 memset(&ir, 0, sizeof(ir));
358 strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name);
359 set_sockaddr(sin, ic_myaddr, 0);
360 if ((err = ic_devinet_ioctl(SIOCSIFADDR, &ir)) < 0) {
361 printk(KERN_ERR "IP-Config: Unable to set interface address (%d).\n", err);
362 return -1;
363 }
364 set_sockaddr(sin, ic_netmask, 0);
365 if ((err = ic_devinet_ioctl(SIOCSIFNETMASK, &ir)) < 0) {
366 printk(KERN_ERR "IP-Config: Unable to set interface netmask (%d).\n", err);
367 return -1;
368 }
369 set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0);
370 if ((err = ic_devinet_ioctl(SIOCSIFBRDADDR, &ir)) < 0) {
371 printk(KERN_ERR "IP-Config: Unable to set interface broadcast address (%d).\n", err);
372 return -1;
373 }
374 /* Handle the case where we need non-standard MTU on the boot link (a network
375 * using jumbo frames, for instance). If we can't set the mtu, don't error
376 * out, we'll try to muddle along.
377 */
378 if (ic_dev_mtu != 0) {
379 strcpy(ir.ifr_name, ic_dev->name);
380 ir.ifr_mtu = ic_dev_mtu;
381 if ((err = ic_dev_ioctl(SIOCSIFMTU, &ir)) < 0)
382 printk(KERN_ERR "IP-Config: Unable to set interface mtu to %d (%d).\n",
383 ic_dev_mtu, err);
384 }
385 return 0;
386 }
387
388 static int __init ic_setup_routes(void)
389 {
390 /* No need to setup device routes, only the default route... */
391
392 if (ic_gateway != NONE) {
393 struct rtentry rm;
394 int err;
395
396 memset(&rm, 0, sizeof(rm));
397 if ((ic_gateway ^ ic_myaddr) & ic_netmask) {
398 printk(KERN_ERR "IP-Config: Gateway not on directly connected network.\n");
399 return -1;
400 }
401 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0);
402 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0);
403 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0);
404 rm.rt_flags = RTF_UP | RTF_GATEWAY;
405 if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) {
406 printk(KERN_ERR "IP-Config: Cannot add default route (%d).\n", err);
407 return -1;
408 }
409 }
410
411 return 0;
412 }
413
414 /*
415 * Fill in default values for all missing parameters.
416 */
417
418 static int __init ic_defaults(void)
419 {
420 /*
421 * At this point we have no userspace running so need not
422 * claim locks on system_utsname
423 */
424
425 if (!ic_host_name_set)
426 sprintf(init_utsname()->nodename, "%pI4", &ic_myaddr);
427
428 if (root_server_addr == NONE)
429 root_server_addr = ic_servaddr;
430
431 if (ic_netmask == NONE) {
432 if (IN_CLASSA(ntohl(ic_myaddr)))
433 ic_netmask = htonl(IN_CLASSA_NET);
434 else if (IN_CLASSB(ntohl(ic_myaddr)))
435 ic_netmask = htonl(IN_CLASSB_NET);
436 else if (IN_CLASSC(ntohl(ic_myaddr)))
437 ic_netmask = htonl(IN_CLASSC_NET);
438 else {
439 printk(KERN_ERR "IP-Config: Unable to guess netmask for address %pI4\n",
440 &ic_myaddr);
441 return -1;
442 }
443 printk("IP-Config: Guessing netmask %pI4\n", &ic_netmask);
444 }
445
446 return 0;
447 }
448
449 /*
450 * RARP support.
451 */
452
453 #ifdef IPCONFIG_RARP
454
455 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
456
457 static struct packet_type rarp_packet_type __initdata = {
458 .type = cpu_to_be16(ETH_P_RARP),
459 .func = ic_rarp_recv,
460 };
461
462 static inline void __init ic_rarp_init(void)
463 {
464 dev_add_pack(&rarp_packet_type);
465 }
466
467 static inline void __init ic_rarp_cleanup(void)
468 {
469 dev_remove_pack(&rarp_packet_type);
470 }
471
472 /*
473 * Process received RARP packet.
474 */
475 static int __init
476 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
477 {
478 struct arphdr *rarp;
479 unsigned char *rarp_ptr;
480 __be32 sip, tip;
481 unsigned char *sha, *tha; /* s for "source", t for "target" */
482 struct ic_device *d;
483
484 if (!net_eq(dev_net(dev), &init_net))
485 goto drop;
486
487 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
488 return NET_RX_DROP;
489
490 if (!pskb_may_pull(skb, sizeof(struct arphdr)))
491 goto drop;
492
493 /* Basic sanity checks can be done without the lock. */
494 rarp = (struct arphdr *)skb_transport_header(skb);
495
496 /* If this test doesn't pass, it's not IP, or we should
497 * ignore it anyway.
498 */
499 if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd))
500 goto drop;
501
502 /* If it's not a RARP reply, delete it. */
503 if (rarp->ar_op != htons(ARPOP_RREPLY))
504 goto drop;
505
506 /* If it's not Ethernet, delete it. */
507 if (rarp->ar_pro != htons(ETH_P_IP))
508 goto drop;
509
510 if (!pskb_may_pull(skb, arp_hdr_len(dev)))
511 goto drop;
512
513 /* OK, it is all there and looks valid, process... */
514 rarp = (struct arphdr *)skb_transport_header(skb);
515 rarp_ptr = (unsigned char *) (rarp + 1);
516
517 /* One reply at a time, please. */
518 spin_lock(&ic_recv_lock);
519
520 /* If we already have a reply, just drop the packet */
521 if (ic_got_reply)
522 goto drop_unlock;
523
524 /* Find the ic_device that the packet arrived on */
525 d = ic_first_dev;
526 while (d && d->dev != dev)
527 d = d->next;
528 if (!d)
529 goto drop_unlock; /* should never happen */
530
531 /* Extract variable-width fields */
532 sha = rarp_ptr;
533 rarp_ptr += dev->addr_len;
534 memcpy(&sip, rarp_ptr, 4);
535 rarp_ptr += 4;
536 tha = rarp_ptr;
537 rarp_ptr += dev->addr_len;
538 memcpy(&tip, rarp_ptr, 4);
539
540 /* Discard packets which are not meant for us. */
541 if (memcmp(tha, dev->dev_addr, dev->addr_len))
542 goto drop_unlock;
543
544 /* Discard packets which are not from specified server. */
545 if (ic_servaddr != NONE && ic_servaddr != sip)
546 goto drop_unlock;
547
548 /* We have a winner! */
549 ic_dev = dev;
550 if (ic_myaddr == NONE)
551 ic_myaddr = tip;
552 ic_servaddr = sip;
553 ic_got_reply = IC_RARP;
554
555 drop_unlock:
556 /* Show's over. Nothing to see here. */
557 spin_unlock(&ic_recv_lock);
558
559 drop:
560 /* Throw the packet out. */
561 kfree_skb(skb);
562 return 0;
563 }
564
565
566 /*
567 * Send RARP request packet over a single interface.
568 */
569 static void __init ic_rarp_send_if(struct ic_device *d)
570 {
571 struct net_device *dev = d->dev;
572 arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL,
573 dev->dev_addr, dev->dev_addr);
574 }
575 #endif
576
577 /*
578 * DHCP/BOOTP support.
579 */
580
581 #ifdef IPCONFIG_BOOTP
582
583 struct bootp_pkt { /* BOOTP packet format */
584 struct iphdr iph; /* IP header */
585 struct udphdr udph; /* UDP header */
586 u8 op; /* 1=request, 2=reply */
587 u8 htype; /* HW address type */
588 u8 hlen; /* HW address length */
589 u8 hops; /* Used only by gateways */
590 __be32 xid; /* Transaction ID */
591 __be16 secs; /* Seconds since we started */
592 __be16 flags; /* Just what it says */
593 __be32 client_ip; /* Client's IP address if known */
594 __be32 your_ip; /* Assigned IP address */
595 __be32 server_ip; /* (Next, e.g. NFS) Server's IP address */
596 __be32 relay_ip; /* IP address of BOOTP relay */
597 u8 hw_addr[16]; /* Client's HW address */
598 u8 serv_name[64]; /* Server host name */
599 u8 boot_file[128]; /* Name of boot file */
600 u8 exten[312]; /* DHCP options / BOOTP vendor extensions */
601 };
602
603 /* packet ops */
604 #define BOOTP_REQUEST 1
605 #define BOOTP_REPLY 2
606
607 /* DHCP message types */
608 #define DHCPDISCOVER 1
609 #define DHCPOFFER 2
610 #define DHCPREQUEST 3
611 #define DHCPDECLINE 4
612 #define DHCPACK 5
613 #define DHCPNAK 6
614 #define DHCPRELEASE 7
615 #define DHCPINFORM 8
616
617 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
618
619 static struct packet_type bootp_packet_type __initdata = {
620 .type = cpu_to_be16(ETH_P_IP),
621 .func = ic_bootp_recv,
622 };
623
624
625 /*
626 * Initialize DHCP/BOOTP extension fields in the request.
627 */
628
629 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 };
630
631 #ifdef IPCONFIG_DHCP
632
633 static void __init
634 ic_dhcp_init_options(u8 *options)
635 {
636 u8 mt = ((ic_servaddr == NONE)
637 ? DHCPDISCOVER : DHCPREQUEST);
638 u8 *e = options;
639 int len;
640
641 #ifdef IPCONFIG_DEBUG
642 printk("DHCP: Sending message type %d\n", mt);
643 #endif
644
645 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */
646 e += 4;
647
648 *e++ = 53; /* DHCP message type */
649 *e++ = 1;
650 *e++ = mt;
651
652 if (mt == DHCPREQUEST) {
653 *e++ = 54; /* Server ID (IP address) */
654 *e++ = 4;
655 memcpy(e, &ic_servaddr, 4);
656 e += 4;
657
658 *e++ = 50; /* Requested IP address */
659 *e++ = 4;
660 memcpy(e, &ic_myaddr, 4);
661 e += 4;
662 }
663
664 /* always? */
665 {
666 static const u8 ic_req_params[] = {
667 1, /* Subnet mask */
668 3, /* Default gateway */
669 6, /* DNS server */
670 12, /* Host name */
671 15, /* Domain name */
672 17, /* Boot path */
673 26, /* MTU */
674 40, /* NIS domain name */
675 };
676
677 *e++ = 55; /* Parameter request list */
678 *e++ = sizeof(ic_req_params);
679 memcpy(e, ic_req_params, sizeof(ic_req_params));
680 e += sizeof(ic_req_params);
681
682 if (ic_host_name_set) {
683 *e++ = 12; /* host-name */
684 len = strlen(utsname()->nodename);
685 *e++ = len;
686 memcpy(e, utsname()->nodename, len);
687 e += len;
688 }
689 if (*vendor_class_identifier) {
690 printk(KERN_INFO "DHCP: sending class identifier \"%s\"\n",
691 vendor_class_identifier);
692 *e++ = 60; /* Class-identifier */
693 len = strlen(vendor_class_identifier);
694 *e++ = len;
695 memcpy(e, vendor_class_identifier, len);
696 e += len;
697 }
698 }
699
700 *e++ = 255; /* End of the list */
701 }
702
703 #endif /* IPCONFIG_DHCP */
704
705 static void __init ic_bootp_init_ext(u8 *e)
706 {
707 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */
708 e += 4;
709 *e++ = 1; /* Subnet mask request */
710 *e++ = 4;
711 e += 4;
712 *e++ = 3; /* Default gateway request */
713 *e++ = 4;
714 e += 4;
715 *e++ = 5; /* Name server request */
716 *e++ = 8;
717 e += 8;
718 *e++ = 12; /* Host name request */
719 *e++ = 32;
720 e += 32;
721 *e++ = 40; /* NIS Domain name request */
722 *e++ = 32;
723 e += 32;
724 *e++ = 17; /* Boot path */
725 *e++ = 40;
726 e += 40;
727
728 *e++ = 57; /* set extension buffer size for reply */
729 *e++ = 2;
730 *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */
731 *e++ = 150;
732
733 *e++ = 255; /* End of the list */
734 }
735
736
737 /*
738 * Initialize the DHCP/BOOTP mechanism.
739 */
740 static inline void __init ic_bootp_init(void)
741 {
742 int i;
743
744 for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
745 ic_nameservers[i] = NONE;
746
747 dev_add_pack(&bootp_packet_type);
748 }
749
750
751 /*
752 * DHCP/BOOTP cleanup.
753 */
754 static inline void __init ic_bootp_cleanup(void)
755 {
756 dev_remove_pack(&bootp_packet_type);
757 }
758
759
760 /*
761 * Send DHCP/BOOTP request to single interface.
762 */
763 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff)
764 {
765 struct net_device *dev = d->dev;
766 struct sk_buff *skb;
767 struct bootp_pkt *b;
768 struct iphdr *h;
769
770 /* Allocate packet */
771 skb = alloc_skb(sizeof(struct bootp_pkt) + LL_ALLOCATED_SPACE(dev) + 15,
772 GFP_KERNEL);
773 if (!skb)
774 return;
775 skb_reserve(skb, LL_RESERVED_SPACE(dev));
776 b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt));
777 memset(b, 0, sizeof(struct bootp_pkt));
778
779 /* Construct IP header */
780 skb_reset_network_header(skb);
781 h = ip_hdr(skb);
782 h->version = 4;
783 h->ihl = 5;
784 h->tot_len = htons(sizeof(struct bootp_pkt));
785 h->frag_off = htons(IP_DF);
786 h->ttl = 64;
787 h->protocol = IPPROTO_UDP;
788 h->daddr = htonl(INADDR_BROADCAST);
789 h->check = ip_fast_csum((unsigned char *) h, h->ihl);
790
791 /* Construct UDP header */
792 b->udph.source = htons(68);
793 b->udph.dest = htons(67);
794 b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr));
795 /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */
796
797 /* Construct DHCP/BOOTP header */
798 b->op = BOOTP_REQUEST;
799 if (dev->type < 256) /* check for false types */
800 b->htype = dev->type;
801 else if (dev->type == ARPHRD_IEEE802_TR) /* fix for token ring */
802 b->htype = ARPHRD_IEEE802;
803 else if (dev->type == ARPHRD_FDDI)
804 b->htype = ARPHRD_ETHER;
805 else {
806 printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name);
807 b->htype = dev->type; /* can cause undefined behavior */
808 }
809
810 /* server_ip and your_ip address are both already zero per RFC2131 */
811 b->hlen = dev->addr_len;
812 memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
813 b->secs = htons(jiffies_diff / HZ);
814 b->xid = d->xid;
815
816 /* add DHCP options or BOOTP extensions */
817 #ifdef IPCONFIG_DHCP
818 if (ic_proto_enabled & IC_USE_DHCP)
819 ic_dhcp_init_options(b->exten);
820 else
821 #endif
822 ic_bootp_init_ext(b->exten);
823
824 /* Chain packet down the line... */
825 skb->dev = dev;
826 skb->protocol = htons(ETH_P_IP);
827 if (dev_hard_header(skb, dev, ntohs(skb->protocol),
828 dev->broadcast, dev->dev_addr, skb->len) < 0 ||
829 dev_queue_xmit(skb) < 0)
830 printk("E");
831 }
832
833
834 /*
835 * Copy BOOTP-supplied string if not already set.
836 */
837 static int __init ic_bootp_string(char *dest, char *src, int len, int max)
838 {
839 if (!len)
840 return 0;
841 if (len > max-1)
842 len = max-1;
843 memcpy(dest, src, len);
844 dest[len] = '\0';
845 return 1;
846 }
847
848
849 /*
850 * Process BOOTP extensions.
851 */
852 static void __init ic_do_bootp_ext(u8 *ext)
853 {
854 u8 servers;
855 int i;
856 u16 mtu;
857
858 #ifdef IPCONFIG_DEBUG
859 u8 *c;
860
861 printk("DHCP/BOOTP: Got extension %d:",*ext);
862 for (c=ext+2; c<ext+2+ext[1]; c++)
863 printk(" %02x", *c);
864 printk("\n");
865 #endif
866
867 switch (*ext++) {
868 case 1: /* Subnet mask */
869 if (ic_netmask == NONE)
870 memcpy(&ic_netmask, ext+1, 4);
871 break;
872 case 3: /* Default gateway */
873 if (ic_gateway == NONE)
874 memcpy(&ic_gateway, ext+1, 4);
875 break;
876 case 6: /* DNS server */
877 servers= *ext/4;
878 if (servers > CONF_NAMESERVERS_MAX)
879 servers = CONF_NAMESERVERS_MAX;
880 for (i = 0; i < servers; i++) {
881 if (ic_nameservers[i] == NONE)
882 memcpy(&ic_nameservers[i], ext+1+4*i, 4);
883 }
884 break;
885 case 12: /* Host name */
886 ic_bootp_string(utsname()->nodename, ext+1, *ext, __NEW_UTS_LEN);
887 ic_host_name_set = 1;
888 break;
889 case 15: /* Domain name (DNS) */
890 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
891 break;
892 case 17: /* Root path */
893 if (!root_server_path[0])
894 ic_bootp_string(root_server_path, ext+1, *ext, sizeof(root_server_path));
895 break;
896 case 26: /* Interface MTU */
897 memcpy(&mtu, ext+1, sizeof(mtu));
898 ic_dev_mtu = ntohs(mtu);
899 break;
900 case 40: /* NIS Domain name (_not_ DNS) */
901 ic_bootp_string(utsname()->domainname, ext+1, *ext, __NEW_UTS_LEN);
902 break;
903 }
904 }
905
906
907 /*
908 * Receive BOOTP reply.
909 */
910 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
911 {
912 struct bootp_pkt *b;
913 struct iphdr *h;
914 struct ic_device *d;
915 int len, ext_len;
916
917 if (!net_eq(dev_net(dev), &init_net))
918 goto drop;
919
920 /* Perform verifications before taking the lock. */
921 if (skb->pkt_type == PACKET_OTHERHOST)
922 goto drop;
923
924 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
925 return NET_RX_DROP;
926
927 if (!pskb_may_pull(skb,
928 sizeof(struct iphdr) +
929 sizeof(struct udphdr)))
930 goto drop;
931
932 b = (struct bootp_pkt *)skb_network_header(skb);
933 h = &b->iph;
934
935 if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP)
936 goto drop;
937
938 /* Fragments are not supported */
939 if (h->frag_off & htons(IP_OFFSET | IP_MF)) {
940 if (net_ratelimit())
941 printk(KERN_ERR "DHCP/BOOTP: Ignoring fragmented "
942 "reply.\n");
943 goto drop;
944 }
945
946 if (skb->len < ntohs(h->tot_len))
947 goto drop;
948
949 if (ip_fast_csum((char *) h, h->ihl))
950 goto drop;
951
952 if (b->udph.source != htons(67) || b->udph.dest != htons(68))
953 goto drop;
954
955 if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
956 goto drop;
957
958 len = ntohs(b->udph.len) - sizeof(struct udphdr);
959 ext_len = len - (sizeof(*b) -
960 sizeof(struct iphdr) -
961 sizeof(struct udphdr) -
962 sizeof(b->exten));
963 if (ext_len < 0)
964 goto drop;
965
966 /* Ok the front looks good, make sure we can get at the rest. */
967 if (!pskb_may_pull(skb, skb->len))
968 goto drop;
969
970 b = (struct bootp_pkt *)skb_network_header(skb);
971 h = &b->iph;
972
973 /* One reply at a time, please. */
974 spin_lock(&ic_recv_lock);
975
976 /* If we already have a reply, just drop the packet */
977 if (ic_got_reply)
978 goto drop_unlock;
979
980 /* Find the ic_device that the packet arrived on */
981 d = ic_first_dev;
982 while (d && d->dev != dev)
983 d = d->next;
984 if (!d)
985 goto drop_unlock; /* should never happen */
986
987 /* Is it a reply to our BOOTP request? */
988 if (b->op != BOOTP_REPLY ||
989 b->xid != d->xid) {
990 if (net_ratelimit())
991 printk(KERN_ERR "DHCP/BOOTP: Reply not for us, "
992 "op[%x] xid[%x]\n",
993 b->op, b->xid);
994 goto drop_unlock;
995 }
996
997 /* Is it a reply for the device we are configuring? */
998 if (b->xid != ic_dev_xid) {
999 if (net_ratelimit())
1000 printk(KERN_ERR "DHCP/BOOTP: Ignoring delayed packet\n");
1001 goto drop_unlock;
1002 }
1003
1004 /* Parse extensions */
1005 if (ext_len >= 4 &&
1006 !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */
1007 u8 *end = (u8 *) b + ntohs(b->iph.tot_len);
1008 u8 *ext;
1009
1010 #ifdef IPCONFIG_DHCP
1011 if (ic_proto_enabled & IC_USE_DHCP) {
1012 __be32 server_id = NONE;
1013 int mt = 0;
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 break;
1023 switch (*opt) {
1024 case 53: /* Message type */
1025 if (opt[1])
1026 mt = opt[2];
1027 break;
1028 case 54: /* Server ID (IP address) */
1029 if (opt[1] >= 4)
1030 memcpy(&server_id, opt + 2, 4);
1031 break;
1032 }
1033 }
1034
1035 #ifdef IPCONFIG_DEBUG
1036 printk("DHCP: Got message type %d\n", mt);
1037 #endif
1038
1039 switch (mt) {
1040 case DHCPOFFER:
1041 /* While in the process of accepting one offer,
1042 * ignore all others.
1043 */
1044 if (ic_myaddr != NONE)
1045 goto drop_unlock;
1046
1047 /* Let's accept that offer. */
1048 ic_myaddr = b->your_ip;
1049 ic_servaddr = server_id;
1050 #ifdef IPCONFIG_DEBUG
1051 printk("DHCP: Offered address %pI4 by server %pI4\n",
1052 &ic_myaddr, &ic_servaddr);
1053 #endif
1054 /* The DHCP indicated server address takes
1055 * precedence over the bootp header one if
1056 * they are different.
1057 */
1058 if ((server_id != NONE) &&
1059 (b->server_ip != server_id))
1060 b->server_ip = ic_servaddr;
1061 break;
1062
1063 case DHCPACK:
1064 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0)
1065 goto drop_unlock;
1066
1067 /* Yeah! */
1068 break;
1069
1070 default:
1071 /* Urque. Forget it*/
1072 ic_myaddr = NONE;
1073 ic_servaddr = NONE;
1074 goto drop_unlock;
1075 }
1076
1077 ic_dhcp_msgtype = mt;
1078
1079 }
1080 #endif /* IPCONFIG_DHCP */
1081
1082 ext = &b->exten[4];
1083 while (ext < end && *ext != 0xff) {
1084 u8 *opt = ext++;
1085 if (*opt == 0) /* Padding */
1086 continue;
1087 ext += *ext + 1;
1088 if (ext < end)
1089 ic_do_bootp_ext(opt);
1090 }
1091 }
1092
1093 /* We have a winner! */
1094 ic_dev = dev;
1095 ic_myaddr = b->your_ip;
1096 ic_servaddr = b->server_ip;
1097 if (ic_gateway == NONE && b->relay_ip)
1098 ic_gateway = b->relay_ip;
1099 if (ic_nameservers[0] == NONE)
1100 ic_nameservers[0] = ic_servaddr;
1101 ic_got_reply = IC_BOOTP;
1102
1103 drop_unlock:
1104 /* Show's over. Nothing to see here. */
1105 spin_unlock(&ic_recv_lock);
1106
1107 drop:
1108 /* Throw the packet out. */
1109 kfree_skb(skb);
1110
1111 return 0;
1112 }
1113
1114
1115 #endif
1116
1117
1118 /*
1119 * Dynamic IP configuration -- DHCP, BOOTP, RARP.
1120 */
1121
1122 #ifdef IPCONFIG_DYNAMIC
1123
1124 static int __init ic_dynamic(void)
1125 {
1126 int retries;
1127 struct ic_device *d;
1128 unsigned long start_jiffies, timeout, jiff;
1129 int do_bootp = ic_proto_have_if & IC_BOOTP;
1130 int do_rarp = ic_proto_have_if & IC_RARP;
1131
1132 /*
1133 * If none of DHCP/BOOTP/RARP was selected, return with an error.
1134 * This routine gets only called when some pieces of information
1135 * are missing, and without DHCP/BOOTP/RARP we are unable to get it.
1136 */
1137 if (!ic_proto_enabled) {
1138 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
1139 return -1;
1140 }
1141
1142 #ifdef IPCONFIG_BOOTP
1143 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
1144 printk(KERN_ERR "DHCP/BOOTP: No suitable device found.\n");
1145 #endif
1146 #ifdef IPCONFIG_RARP
1147 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)
1148 printk(KERN_ERR "RARP: No suitable device found.\n");
1149 #endif
1150
1151 if (!ic_proto_have_if)
1152 /* Error message already printed */
1153 return -1;
1154
1155 /*
1156 * Setup protocols
1157 */
1158 #ifdef IPCONFIG_BOOTP
1159 if (do_bootp)
1160 ic_bootp_init();
1161 #endif
1162 #ifdef IPCONFIG_RARP
1163 if (do_rarp)
1164 ic_rarp_init();
1165 #endif
1166
1167 /*
1168 * Send requests and wait, until we get an answer. This loop
1169 * seems to be a terrible waste of CPU time, but actually there is
1170 * only one process running at all, so we don't need to use any
1171 * scheduler functions.
1172 * [Actually we could now, but the nothing else running note still
1173 * applies.. - AC]
1174 */
1175 printk(KERN_NOTICE "Sending %s%s%s requests .",
1176 do_bootp
1177 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "",
1178 (do_bootp && do_rarp) ? " and " : "",
1179 do_rarp ? "RARP" : "");
1180
1181 start_jiffies = jiffies;
1182 d = ic_first_dev;
1183 retries = CONF_SEND_RETRIES;
1184 get_random_bytes(&timeout, sizeof(timeout));
1185 timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned) CONF_TIMEOUT_RANDOM);
1186 for (;;) {
1187 /* Track the device we are configuring */
1188 ic_dev_xid = d->xid;
1189
1190 #ifdef IPCONFIG_BOOTP
1191 if (do_bootp && (d->able & IC_BOOTP))
1192 ic_bootp_send_if(d, jiffies - start_jiffies);
1193 #endif
1194 #ifdef IPCONFIG_RARP
1195 if (do_rarp && (d->able & IC_RARP))
1196 ic_rarp_send_if(d);
1197 #endif
1198
1199 jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout);
1200 while (time_before(jiffies, jiff) && !ic_got_reply)
1201 schedule_timeout_uninterruptible(1);
1202 #ifdef IPCONFIG_DHCP
1203 /* DHCP isn't done until we get a DHCPACK. */
1204 if ((ic_got_reply & IC_BOOTP) &&
1205 (ic_proto_enabled & IC_USE_DHCP) &&
1206 ic_dhcp_msgtype != DHCPACK) {
1207 ic_got_reply = 0;
1208 printk(KERN_CONT ",");
1209 continue;
1210 }
1211 #endif /* IPCONFIG_DHCP */
1212
1213 if (ic_got_reply) {
1214 printk(KERN_CONT " OK\n");
1215 break;
1216 }
1217
1218 if ((d = d->next))
1219 continue;
1220
1221 if (! --retries) {
1222 printk(KERN_CONT " timed out!\n");
1223 break;
1224 }
1225
1226 d = ic_first_dev;
1227
1228 timeout = timeout CONF_TIMEOUT_MULT;
1229 if (timeout > CONF_TIMEOUT_MAX)
1230 timeout = CONF_TIMEOUT_MAX;
1231
1232 printk(KERN_CONT ".");
1233 }
1234
1235 #ifdef IPCONFIG_BOOTP
1236 if (do_bootp)
1237 ic_bootp_cleanup();
1238 #endif
1239 #ifdef IPCONFIG_RARP
1240 if (do_rarp)
1241 ic_rarp_cleanup();
1242 #endif
1243
1244 if (!ic_got_reply) {
1245 ic_myaddr = NONE;
1246 return -1;
1247 }
1248
1249 printk("IP-Config: Got %s answer from %pI4, ",
1250 ((ic_got_reply & IC_RARP) ? "RARP"
1251 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),
1252 &ic_servaddr);
1253 printk(KERN_CONT "my address is %pI4\n", &ic_myaddr);
1254
1255 return 0;
1256 }
1257
1258 #endif /* IPCONFIG_DYNAMIC */
1259
1260 #ifdef CONFIG_PROC_FS
1261
1262 static int pnp_seq_show(struct seq_file *seq, void *v)
1263 {
1264 int i;
1265
1266 if (ic_proto_used & IC_PROTO)
1267 seq_printf(seq, "#PROTO: %s\n",
1268 (ic_proto_used & IC_RARP) ? "RARP"
1269 : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP");
1270 else
1271 seq_puts(seq, "#MANUAL\n");
1272
1273 if (ic_domain[0])
1274 seq_printf(seq,
1275 "domain %s\n", ic_domain);
1276 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {
1277 if (ic_nameservers[i] != NONE)
1278 seq_printf(seq, "nameserver %pI4\n",
1279 &ic_nameservers[i]);
1280 }
1281 if (ic_servaddr != NONE)
1282 seq_printf(seq, "bootserver %pI4\n",
1283 &ic_servaddr);
1284 return 0;
1285 }
1286
1287 static int pnp_seq_open(struct inode *indoe, struct file *file)
1288 {
1289 return single_open(file, pnp_seq_show, NULL);
1290 }
1291
1292 static const struct file_operations pnp_seq_fops = {
1293 .owner = THIS_MODULE,
1294 .open = pnp_seq_open,
1295 .read = seq_read,
1296 .llseek = seq_lseek,
1297 .release = single_release,
1298 };
1299 #endif /* CONFIG_PROC_FS */
1300
1301 /*
1302 * Extract IP address from the parameter string if needed. Note that we
1303 * need to have root_server_addr set _before_ IPConfig gets called as it
1304 * can override it.
1305 */
1306 __be32 __init root_nfs_parse_addr(char *name)
1307 {
1308 __be32 addr;
1309 int octets = 0;
1310 char *cp, *cq;
1311
1312 cp = cq = name;
1313 while (octets < 4) {
1314 while (*cp >= '0' && *cp <= '9')
1315 cp++;
1316 if (cp == cq || cp - cq > 3)
1317 break;
1318 if (*cp == '.' || octets == 3)
1319 octets++;
1320 if (octets < 4)
1321 cp++;
1322 cq = cp;
1323 }
1324 if (octets == 4 && (*cp == ':' || *cp == '\0')) {
1325 if (*cp == ':')
1326 *cp++ = '\0';
1327 addr = in_aton(name);
1328 memmove(name, cp, strlen(cp) + 1);
1329 } else
1330 addr = NONE;
1331
1332 return addr;
1333 }
1334
1335 #define DEVICE_WAIT_MAX 12 /* 12 seconds */
1336
1337 static int __init wait_for_devices(void)
1338 {
1339 int i;
1340
1341 for (i = 0; i < DEVICE_WAIT_MAX; i++) {
1342 struct net_device *dev;
1343 int found = 0;
1344
1345 rtnl_lock();
1346 for_each_netdev(&init_net, dev) {
1347 if (ic_is_init_dev(dev)) {
1348 found = 1;
1349 break;
1350 }
1351 }
1352 rtnl_unlock();
1353 if (found)
1354 return 0;
1355 ssleep(1);
1356 }
1357 return -ENODEV;
1358 }
1359
1360 /*
1361 * IP Autoconfig dispatcher.
1362 */
1363
1364 static int __init ip_auto_config(void)
1365 {
1366 __be32 addr;
1367 #ifdef IPCONFIG_DYNAMIC
1368 int retries = CONF_OPEN_RETRIES;
1369 #endif
1370 int err;
1371
1372 #ifdef CONFIG_PROC_FS
1373 proc_net_fops_create(&init_net, "pnp", S_IRUGO, &pnp_seq_fops);
1374 #endif /* CONFIG_PROC_FS */
1375
1376 if (!ic_enable)
1377 return 0;
1378
1379 DBG(("IP-Config: Entered.\n"));
1380 #ifdef IPCONFIG_DYNAMIC
1381 try_try_again:
1382 #endif
1383 /* Wait for devices to appear */
1384 err = wait_for_devices();
1385 if (err)
1386 return err;
1387
1388 /* Setup all network devices */
1389 err = ic_open_devs();
1390 if (err)
1391 return err;
1392
1393 /* Give drivers a chance to settle */
1394 msleep(CONF_POST_OPEN);
1395
1396 /*
1397 * If the config information is insufficient (e.g., our IP address or
1398 * IP address of the boot server is missing or we have multiple network
1399 * interfaces and no default was set), use BOOTP or RARP to get the
1400 * missing values.
1401 */
1402 if (ic_myaddr == NONE ||
1403 #ifdef CONFIG_ROOT_NFS
1404 (root_server_addr == NONE &&
1405 ic_servaddr == NONE &&
1406 ROOT_DEV == Root_NFS) ||
1407 #endif
1408 ic_first_dev->next) {
1409 #ifdef IPCONFIG_DYNAMIC
1410 if (ic_dynamic() < 0) {
1411 ic_close_devs();
1412
1413 /*
1414 * I don't know why, but sometimes the
1415 * eepro100 driver (at least) gets upset and
1416 * doesn't work the first time it's opened.
1417 * But then if you close it and reopen it, it
1418 * works just fine. So we need to try that at
1419 * least once before giving up.
1420 *
1421 * Also, if the root will be NFS-mounted, we
1422 * have nowhere to go if DHCP fails. So we
1423 * just have to keep trying forever.
1424 *
1425 * -- Chip
1426 */
1427 #ifdef CONFIG_ROOT_NFS
1428 if (ROOT_DEV == Root_NFS) {
1429 printk(KERN_ERR
1430 "IP-Config: Retrying forever (NFS root)...\n");
1431 goto try_try_again;
1432 }
1433 #endif
1434
1435 if (--retries) {
1436 printk(KERN_ERR
1437 "IP-Config: Reopening network devices...\n");
1438 goto try_try_again;
1439 }
1440
1441 /* Oh, well. At least we tried. */
1442 printk(KERN_ERR "IP-Config: Auto-configuration of network failed.\n");
1443 return -1;
1444 }
1445 #else /* !DYNAMIC */
1446 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
1447 ic_close_devs();
1448 return -1;
1449 #endif /* IPCONFIG_DYNAMIC */
1450 } else {
1451 /* Device selected manually or only one device -> use it */
1452 ic_dev = ic_first_dev->dev;
1453 }
1454
1455 addr = root_nfs_parse_addr(root_server_path);
1456 if (root_server_addr == NONE)
1457 root_server_addr = addr;
1458
1459 /*
1460 * Use defaults wherever applicable.
1461 */
1462 if (ic_defaults() < 0)
1463 return -1;
1464
1465 /*
1466 * Close all network devices except the device we've
1467 * autoconfigured and set up routes.
1468 */
1469 ic_close_devs();
1470 if (ic_setup_if() < 0 || ic_setup_routes() < 0)
1471 return -1;
1472
1473 /*
1474 * Record which protocol was actually used.
1475 */
1476 #ifdef IPCONFIG_DYNAMIC
1477 ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP);
1478 #endif
1479
1480 #ifndef IPCONFIG_SILENT
1481 /*
1482 * Clue in the operator.
1483 */
1484 printk("IP-Config: Complete:\n");
1485 printk(" device=%s", ic_dev->name);
1486 printk(KERN_CONT ", addr=%pI4", &ic_myaddr);
1487 printk(KERN_CONT ", mask=%pI4", &ic_netmask);
1488 printk(KERN_CONT ", gw=%pI4", &ic_gateway);
1489 printk(KERN_CONT ",\n host=%s, domain=%s, nis-domain=%s",
1490 utsname()->nodename, ic_domain, utsname()->domainname);
1491 printk(KERN_CONT ",\n bootserver=%pI4", &ic_servaddr);
1492 printk(KERN_CONT ", rootserver=%pI4", &root_server_addr);
1493 printk(KERN_CONT ", rootpath=%s", root_server_path);
1494 if (ic_dev_mtu)
1495 printk(KERN_CONT ", mtu=%d", ic_dev_mtu);
1496 printk(KERN_CONT "\n");
1497 #endif /* !SILENT */
1498
1499 return 0;
1500 }
1501
1502 late_initcall(ip_auto_config);
1503
1504
1505 /*
1506 * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
1507 * command line parameter. See Documentation/filesystems/nfs/nfsroot.txt.
1508 */
1509 static int __init ic_proto_name(char *name)
1510 {
1511 if (!strcmp(name, "on") || !strcmp(name, "any")) {
1512 return 1;
1513 }
1514 if (!strcmp(name, "off") || !strcmp(name, "none")) {
1515 return 0;
1516 }
1517 #ifdef CONFIG_IP_PNP_DHCP
1518 else if (!strcmp(name, "dhcp")) {
1519 ic_proto_enabled &= ~IC_RARP;
1520 return 1;
1521 }
1522 #endif
1523 #ifdef CONFIG_IP_PNP_BOOTP
1524 else if (!strcmp(name, "bootp")) {
1525 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP);
1526 return 1;
1527 }
1528 #endif
1529 #ifdef CONFIG_IP_PNP_RARP
1530 else if (!strcmp(name, "rarp")) {
1531 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP);
1532 return 1;
1533 }
1534 #endif
1535 #ifdef IPCONFIG_DYNAMIC
1536 else if (!strcmp(name, "both")) {
1537 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */
1538 return 1;
1539 }
1540 #endif
1541 return 0;
1542 }
1543
1544 static int __init ip_auto_config_setup(char *addrs)
1545 {
1546 char *cp, *ip, *dp;
1547 int num = 0;
1548
1549 ic_set_manually = 1;
1550 ic_enable = 1;
1551
1552 /*
1553 * If any dhcp, bootp etc options are set, leave autoconfig on
1554 * and skip the below static IP processing.
1555 */
1556 if (ic_proto_name(addrs))
1557 return 1;
1558
1559 /* If no static IP is given, turn off autoconfig and bail. */
1560 if (*addrs == 0 ||
1561 strcmp(addrs, "off") == 0 ||
1562 strcmp(addrs, "none") == 0) {
1563 ic_enable = 0;
1564 return 1;
1565 }
1566
1567 /* Parse string for static IP assignment. */
1568 ip = addrs;
1569 while (ip && *ip) {
1570 if ((cp = strchr(ip, ':')))
1571 *cp++ = '\0';
1572 if (strlen(ip) > 0) {
1573 DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip));
1574 switch (num) {
1575 case 0:
1576 if ((ic_myaddr = in_aton(ip)) == ANY)
1577 ic_myaddr = NONE;
1578 break;
1579 case 1:
1580 if ((ic_servaddr = in_aton(ip)) == ANY)
1581 ic_servaddr = NONE;
1582 break;
1583 case 2:
1584 if ((ic_gateway = in_aton(ip)) == ANY)
1585 ic_gateway = NONE;
1586 break;
1587 case 3:
1588 if ((ic_netmask = in_aton(ip)) == ANY)
1589 ic_netmask = NONE;
1590 break;
1591 case 4:
1592 if ((dp = strchr(ip, '.'))) {
1593 *dp++ = '\0';
1594 strlcpy(utsname()->domainname, dp,
1595 sizeof(utsname()->domainname));
1596 }
1597 strlcpy(utsname()->nodename, ip,
1598 sizeof(utsname()->nodename));
1599 ic_host_name_set = 1;
1600 break;
1601 case 5:
1602 strlcpy(user_dev_name, ip, sizeof(user_dev_name));
1603 break;
1604 case 6:
1605 if (ic_proto_name(ip) == 0 &&
1606 ic_myaddr == NONE) {
1607 ic_enable = 0;
1608 }
1609 break;
1610 }
1611 }
1612 ip = cp;
1613 num++;
1614 }
1615
1616 return 1;
1617 }
1618
1619 static int __init nfsaddrs_config_setup(char *addrs)
1620 {
1621 return ip_auto_config_setup(addrs);
1622 }
1623
1624 static int __init vendor_class_identifier_setup(char *addrs)
1625 {
1626 if (strlcpy(vendor_class_identifier, addrs,
1627 sizeof(vendor_class_identifier))
1628 >= sizeof(vendor_class_identifier))
1629 printk(KERN_WARNING "DHCP: vendorclass too long, truncated to \"%s\"",
1630 vendor_class_identifier);
1631 return 1;
1632 }
1633
1634 __setup("ip=", ip_auto_config_setup);
1635 __setup("nfsaddrs=", nfsaddrs_config_setup);
1636 __setup("dhcpclass=", vendor_class_identifier_setup);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree