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USB: option: add id for 3G dongle Model VT1000 of Viettel
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / ipv4 / ipconfig.c
blob0da2afc97f32ffae2773098391aba0dcbd004903
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 <linux/export.h>
58 #include <net/net_namespace.h>
59 #include <net/arp.h>
60 #include <net/ip.h>
61 #include <net/ipconfig.h>
62 #include <net/route.h>
63
64 #include <asm/uaccess.h>
65 #include <net/checksum.h>
66 #include <asm/processor.h>
67
68 /* Define this to allow debugging output */
69 #undef IPCONFIG_DEBUG
70
71 #ifdef IPCONFIG_DEBUG
72 #define DBG(x) printk x
73 #else
74 #define DBG(x) do { } while(0)
75 #endif
76
77 #if defined(CONFIG_IP_PNP_DHCP)
78 #define IPCONFIG_DHCP
79 #endif
80 #if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_DHCP)
81 #define IPCONFIG_BOOTP
82 #endif
83 #if defined(CONFIG_IP_PNP_RARP)
84 #define IPCONFIG_RARP
85 #endif
86 #if defined(IPCONFIG_BOOTP) || defined(IPCONFIG_RARP)
87 #define IPCONFIG_DYNAMIC
88 #endif
89
90 /* Define the friendly delay before and after opening net devices */
91 #define CONF_POST_OPEN 10 /* After opening: 10 msecs */
92 #define CONF_CARRIER_TIMEOUT 120000 /* Wait for carrier timeout */
93
94 /* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */
95 #define CONF_OPEN_RETRIES 2 /* (Re)open devices twice */
96 #define CONF_SEND_RETRIES 6 /* Send six requests per open */
97 #define CONF_INTER_TIMEOUT (HZ/2) /* Inter-device timeout: 1/2 second */
98 #define CONF_BASE_TIMEOUT (HZ*2) /* Initial timeout: 2 seconds */
99 #define CONF_TIMEOUT_RANDOM (HZ) /* Maximum amount of randomization */
100 #define CONF_TIMEOUT_MULT *7/4 /* Rate of timeout growth */
101 #define CONF_TIMEOUT_MAX (HZ*30) /* Maximum allowed timeout */
102 #define CONF_NAMESERVERS_MAX 3 /* Maximum number of nameservers
103 - '3' from resolv.h */
104
105 #define NONE cpu_to_be32(INADDR_NONE)
106 #define ANY cpu_to_be32(INADDR_ANY)
107
108 /*
109 * Public IP configuration
110 */
111
112 /* This is used by platforms which might be able to set the ipconfig
113 * variables using firmware environment vars. If this is set, it will
114 * ignore such firmware variables.
115 */
116 int ic_set_manually __initdata = 0; /* IPconfig parameters set manually */
117
118 static int ic_enable __initdata = 0; /* IP config enabled? */
119
120 /* Protocol choice */
121 int ic_proto_enabled __initdata = 0
122 #ifdef IPCONFIG_BOOTP
123 | IC_BOOTP
124 #endif
125 #ifdef CONFIG_IP_PNP_DHCP
126 | IC_USE_DHCP
127 #endif
128 #ifdef IPCONFIG_RARP
129 | IC_RARP
130 #endif
131 ;
132
133 static int ic_host_name_set __initdata = 0; /* Host name set by us? */
134
135 __be32 ic_myaddr = NONE; /* My IP address */
136 static __be32 ic_netmask = NONE; /* Netmask for local subnet */
137 __be32 ic_gateway = NONE; /* Gateway IP address */
138
139 __be32 ic_servaddr = NONE; /* Boot server IP address */
140
141 __be32 root_server_addr = NONE; /* Address of NFS server */
142 u8 root_server_path[256] = { 0, }; /* Path to mount as root */
143
144 u32 ic_dev_xid; /* Device under configuration */
145
146 /* vendor class identifier */
147 static char vendor_class_identifier[253] __initdata;
148
149 /* Persistent data: */
150
151 static int ic_proto_used; /* Protocol used, if any */
152 static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */
153 static u8 ic_domain[64]; /* DNS (not NIS) domain name */
154
155 /*
156 * Private state.
157 */
158
159 /* Name of user-selected boot device */
160 static char user_dev_name[IFNAMSIZ] __initdata = { 0, };
161
162 /* Protocols supported by available interfaces */
163 static int ic_proto_have_if __initdata = 0;
164
165 /* MTU for boot device */
166 static int ic_dev_mtu __initdata = 0;
167
168 #ifdef IPCONFIG_DYNAMIC
169 static DEFINE_SPINLOCK(ic_recv_lock);
170 static volatile int ic_got_reply __initdata = 0; /* Proto(s) that replied */
171 #endif
172 #ifdef IPCONFIG_DHCP
173 static int ic_dhcp_msgtype __initdata = 0; /* DHCP msg type received */
174 #endif
175
176
177 /*
178 * Network devices
179 */
180
181 struct ic_device {
182 struct ic_device *next;
183 struct net_device *dev;
184 unsigned short flags;
185 short able;
186 __be32 xid;
187 };
188
189 static struct ic_device *ic_first_dev __initdata = NULL;/* List of open device */
190 static struct net_device *ic_dev __initdata = NULL; /* Selected device */
191
192 static bool __init ic_is_init_dev(struct net_device *dev)
193 {
194 if (dev->flags & IFF_LOOPBACK)
195 return false;
196 return user_dev_name[0] ? !strcmp(dev->name, user_dev_name) :
197 (!(dev->flags & IFF_LOOPBACK) &&
198 (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) &&
199 strncmp(dev->name, "dummy", 5));
200 }
201
202 static int __init ic_open_devs(void)
203 {
204 struct ic_device *d, **last;
205 struct net_device *dev;
206 unsigned short oflags;
207 unsigned long start;
208
209 last = &ic_first_dev;
210 rtnl_lock();
211
212 /* bring loopback device up first */
213 for_each_netdev(&init_net, dev) {
214 if (!(dev->flags & IFF_LOOPBACK))
215 continue;
216 if (dev_change_flags(dev, dev->flags | IFF_UP) < 0)
217 printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name);
218 }
219
220 for_each_netdev(&init_net, dev) {
221 if (ic_is_init_dev(dev)) {
222 int able = 0;
223 if (dev->mtu >= 364)
224 able |= IC_BOOTP;
225 else
226 printk(KERN_WARNING "DHCP/BOOTP: Ignoring device %s, MTU %d too small", dev->name, dev->mtu);
227 if (!(dev->flags & IFF_NOARP))
228 able |= IC_RARP;
229 able &= ic_proto_enabled;
230 if (ic_proto_enabled && !able)
231 continue;
232 oflags = dev->flags;
233 if (dev_change_flags(dev, oflags | IFF_UP) < 0) {
234 printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name);
235 continue;
236 }
237 if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) {
238 rtnl_unlock();
239 return -ENOMEM;
240 }
241 d->dev = dev;
242 *last = d;
243 last = &d->next;
244 d->flags = oflags;
245 d->able = able;
246 if (able & IC_BOOTP)
247 get_random_bytes(&d->xid, sizeof(__be32));
248 else
249 d->xid = 0;
250 ic_proto_have_if |= able;
251 DBG(("IP-Config: %s UP (able=%d, xid=%08x)\n",
252 dev->name, able, d->xid));
253 }
254 }
255
256 /* wait for a carrier on at least one device */
257 start = jiffies;
258 while (jiffies - start < msecs_to_jiffies(CONF_CARRIER_TIMEOUT)) {
259 for_each_netdev(&init_net, dev)
260 if (ic_is_init_dev(dev) && netif_carrier_ok(dev))
261 goto have_carrier;
262
263 msleep(1);
264 }
265 have_carrier:
266 rtnl_unlock();
267
268 *last = NULL;
269
270 if (!ic_first_dev) {
271 if (user_dev_name[0])
272 printk(KERN_ERR "IP-Config: Device `%s' not found.\n", user_dev_name);
273 else
274 printk(KERN_ERR "IP-Config: No network devices available.\n");
275 return -ENODEV;
276 }
277 return 0;
278 }
279
280 static void __init ic_close_devs(void)
281 {
282 struct ic_device *d, *next;
283 struct net_device *dev;
284
285 rtnl_lock();
286 next = ic_first_dev;
287 while ((d = next)) {
288 next = d->next;
289 dev = d->dev;
290 if (dev != ic_dev) {
291 DBG(("IP-Config: Downing %s\n", dev->name));
292 dev_change_flags(dev, d->flags);
293 }
294 kfree(d);
295 }
296 rtnl_unlock();
297 }
298
299 /*
300 * Interface to various network functions.
301 */
302
303 static inline void
304 set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port)
305 {
306 sin->sin_family = AF_INET;
307 sin->sin_addr.s_addr = addr;
308 sin->sin_port = port;
309 }
310
311 static int __init ic_devinet_ioctl(unsigned int cmd, struct ifreq *arg)
312 {
313 int res;
314
315 mm_segment_t oldfs = get_fs();
316 set_fs(get_ds());
317 res = devinet_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
318 set_fs(oldfs);
319 return res;
320 }
321
322 static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg)
323 {
324 int res;
325
326 mm_segment_t oldfs = get_fs();
327 set_fs(get_ds());
328 res = dev_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
329 set_fs(oldfs);
330 return res;
331 }
332
333 static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg)
334 {
335 int res;
336
337 mm_segment_t oldfs = get_fs();
338 set_fs(get_ds());
339 res = ip_rt_ioctl(&init_net, cmd, (void __user *) arg);
340 set_fs(oldfs);
341 return res;
342 }
343
344 /*
345 * Set up interface addresses and routes.
346 */
347
348 static int __init ic_setup_if(void)
349 {
350 struct ifreq ir;
351 struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr;
352 int err;
353
354 memset(&ir, 0, sizeof(ir));
355 strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name);
356 set_sockaddr(sin, ic_myaddr, 0);
357 if ((err = ic_devinet_ioctl(SIOCSIFADDR, &ir)) < 0) {
358 printk(KERN_ERR "IP-Config: Unable to set interface address (%d).\n", err);
359 return -1;
360 }
361 set_sockaddr(sin, ic_netmask, 0);
362 if ((err = ic_devinet_ioctl(SIOCSIFNETMASK, &ir)) < 0) {
363 printk(KERN_ERR "IP-Config: Unable to set interface netmask (%d).\n", err);
364 return -1;
365 }
366 set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0);
367 if ((err = ic_devinet_ioctl(SIOCSIFBRDADDR, &ir)) < 0) {
368 printk(KERN_ERR "IP-Config: Unable to set interface broadcast address (%d).\n", err);
369 return -1;
370 }
371 /* Handle the case where we need non-standard MTU on the boot link (a network
372 * using jumbo frames, for instance). If we can't set the mtu, don't error
373 * out, we'll try to muddle along.
374 */
375 if (ic_dev_mtu != 0) {
376 strcpy(ir.ifr_name, ic_dev->name);
377 ir.ifr_mtu = ic_dev_mtu;
378 if ((err = ic_dev_ioctl(SIOCSIFMTU, &ir)) < 0)
379 printk(KERN_ERR "IP-Config: Unable to set interface mtu to %d (%d).\n",
380 ic_dev_mtu, err);
381 }
382 return 0;
383 }
384
385 static int __init ic_setup_routes(void)
386 {
387 /* No need to setup device routes, only the default route... */
388
389 if (ic_gateway != NONE) {
390 struct rtentry rm;
391 int err;
392
393 memset(&rm, 0, sizeof(rm));
394 if ((ic_gateway ^ ic_myaddr) & ic_netmask) {
395 printk(KERN_ERR "IP-Config: Gateway not on directly connected network.\n");
396 return -1;
397 }
398 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0);
399 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0);
400 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0);
401 rm.rt_flags = RTF_UP | RTF_GATEWAY;
402 if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) {
403 printk(KERN_ERR "IP-Config: Cannot add default route (%d).\n", err);
404 return -1;
405 }
406 }
407
408 return 0;
409 }
410
411 /*
412 * Fill in default values for all missing parameters.
413 */
414
415 static int __init ic_defaults(void)
416 {
417 /*
418 * At this point we have no userspace running so need not
419 * claim locks on system_utsname
420 */
421
422 if (!ic_host_name_set)
423 sprintf(init_utsname()->nodename, "%pI4", &ic_myaddr);
424
425 if (root_server_addr == NONE)
426 root_server_addr = ic_servaddr;
427
428 if (ic_netmask == NONE) {
429 if (IN_CLASSA(ntohl(ic_myaddr)))
430 ic_netmask = htonl(IN_CLASSA_NET);
431 else if (IN_CLASSB(ntohl(ic_myaddr)))
432 ic_netmask = htonl(IN_CLASSB_NET);
433 else if (IN_CLASSC(ntohl(ic_myaddr)))
434 ic_netmask = htonl(IN_CLASSC_NET);
435 else {
436 printk(KERN_ERR "IP-Config: Unable to guess netmask for address %pI4\n",
437 &ic_myaddr);
438 return -1;
439 }
440 printk("IP-Config: Guessing netmask %pI4\n", &ic_netmask);
441 }
442
443 return 0;
444 }
445
446 /*
447 * RARP support.
448 */
449
450 #ifdef IPCONFIG_RARP
451
452 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
453
454 static struct packet_type rarp_packet_type __initdata = {
455 .type = cpu_to_be16(ETH_P_RARP),
456 .func = ic_rarp_recv,
457 };
458
459 static inline void __init ic_rarp_init(void)
460 {
461 dev_add_pack(&rarp_packet_type);
462 }
463
464 static inline void __init ic_rarp_cleanup(void)
465 {
466 dev_remove_pack(&rarp_packet_type);
467 }
468
469 /*
470 * Process received RARP packet.
471 */
472 static int __init
473 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
474 {
475 struct arphdr *rarp;
476 unsigned char *rarp_ptr;
477 __be32 sip, tip;
478 unsigned char *sha, *tha; /* s for "source", t for "target" */
479 struct ic_device *d;
480
481 if (!net_eq(dev_net(dev), &init_net))
482 goto drop;
483
484 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
485 return NET_RX_DROP;
486
487 if (!pskb_may_pull(skb, sizeof(struct arphdr)))
488 goto drop;
489
490 /* Basic sanity checks can be done without the lock. */
491 rarp = (struct arphdr *)skb_transport_header(skb);
492
493 /* If this test doesn't pass, it's not IP, or we should
494 * ignore it anyway.
495 */
496 if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd))
497 goto drop;
498
499 /* If it's not a RARP reply, delete it. */
500 if (rarp->ar_op != htons(ARPOP_RREPLY))
501 goto drop;
502
503 /* If it's not Ethernet, delete it. */
504 if (rarp->ar_pro != htons(ETH_P_IP))
505 goto drop;
506
507 if (!pskb_may_pull(skb, arp_hdr_len(dev)))
508 goto drop;
509
510 /* OK, it is all there and looks valid, process... */
511 rarp = (struct arphdr *)skb_transport_header(skb);
512 rarp_ptr = (unsigned char *) (rarp + 1);
513
514 /* One reply at a time, please. */
515 spin_lock(&ic_recv_lock);
516
517 /* If we already have a reply, just drop the packet */
518 if (ic_got_reply)
519 goto drop_unlock;
520
521 /* Find the ic_device that the packet arrived on */
522 d = ic_first_dev;
523 while (d && d->dev != dev)
524 d = d->next;
525 if (!d)
526 goto drop_unlock; /* should never happen */
527
528 /* Extract variable-width fields */
529 sha = rarp_ptr;
530 rarp_ptr += dev->addr_len;
531 memcpy(&sip, rarp_ptr, 4);
532 rarp_ptr += 4;
533 tha = rarp_ptr;
534 rarp_ptr += dev->addr_len;
535 memcpy(&tip, rarp_ptr, 4);
536
537 /* Discard packets which are not meant for us. */
538 if (memcmp(tha, dev->dev_addr, dev->addr_len))
539 goto drop_unlock;
540
541 /* Discard packets which are not from specified server. */
542 if (ic_servaddr != NONE && ic_servaddr != sip)
543 goto drop_unlock;
544
545 /* We have a winner! */
546 ic_dev = dev;
547 if (ic_myaddr == NONE)
548 ic_myaddr = tip;
549 ic_servaddr = sip;
550 ic_got_reply = IC_RARP;
551
552 drop_unlock:
553 /* Show's over. Nothing to see here. */
554 spin_unlock(&ic_recv_lock);
555
556 drop:
557 /* Throw the packet out. */
558 kfree_skb(skb);
559 return 0;
560 }
561
562
563 /*
564 * Send RARP request packet over a single interface.
565 */
566 static void __init ic_rarp_send_if(struct ic_device *d)
567 {
568 struct net_device *dev = d->dev;
569 arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL,
570 dev->dev_addr, dev->dev_addr);
571 }
572 #endif
573
574 /*
575 * DHCP/BOOTP support.
576 */
577
578 #ifdef IPCONFIG_BOOTP
579
580 struct bootp_pkt { /* BOOTP packet format */
581 struct iphdr iph; /* IP header */
582 struct udphdr udph; /* UDP header */
583 u8 op; /* 1=request, 2=reply */
584 u8 htype; /* HW address type */
585 u8 hlen; /* HW address length */
586 u8 hops; /* Used only by gateways */
587 __be32 xid; /* Transaction ID */
588 __be16 secs; /* Seconds since we started */
589 __be16 flags; /* Just what it says */
590 __be32 client_ip; /* Client's IP address if known */
591 __be32 your_ip; /* Assigned IP address */
592 __be32 server_ip; /* (Next, e.g. NFS) Server's IP address */
593 __be32 relay_ip; /* IP address of BOOTP relay */
594 u8 hw_addr[16]; /* Client's HW address */
595 u8 serv_name[64]; /* Server host name */
596 u8 boot_file[128]; /* Name of boot file */
597 u8 exten[312]; /* DHCP options / BOOTP vendor extensions */
598 };
599
600 /* packet ops */
601 #define BOOTP_REQUEST 1
602 #define BOOTP_REPLY 2
603
604 /* DHCP message types */
605 #define DHCPDISCOVER 1
606 #define DHCPOFFER 2
607 #define DHCPREQUEST 3
608 #define DHCPDECLINE 4
609 #define DHCPACK 5
610 #define DHCPNAK 6
611 #define DHCPRELEASE 7
612 #define DHCPINFORM 8
613
614 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
615
616 static struct packet_type bootp_packet_type __initdata = {
617 .type = cpu_to_be16(ETH_P_IP),
618 .func = ic_bootp_recv,
619 };
620
621
622 /*
623 * Initialize DHCP/BOOTP extension fields in the request.
624 */
625
626 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 };
627
628 #ifdef IPCONFIG_DHCP
629
630 static void __init
631 ic_dhcp_init_options(u8 *options)
632 {
633 u8 mt = ((ic_servaddr == NONE)
634 ? DHCPDISCOVER : DHCPREQUEST);
635 u8 *e = options;
636 int len;
637
638 #ifdef IPCONFIG_DEBUG
639 printk("DHCP: Sending message type %d\n", mt);
640 #endif
641
642 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */
643 e += 4;
644
645 *e++ = 53; /* DHCP message type */
646 *e++ = 1;
647 *e++ = mt;
648
649 if (mt == DHCPREQUEST) {
650 *e++ = 54; /* Server ID (IP address) */
651 *e++ = 4;
652 memcpy(e, &ic_servaddr, 4);
653 e += 4;
654
655 *e++ = 50; /* Requested IP address */
656 *e++ = 4;
657 memcpy(e, &ic_myaddr, 4);
658 e += 4;
659 }
660
661 /* always? */
662 {
663 static const u8 ic_req_params[] = {
664 1, /* Subnet mask */
665 3, /* Default gateway */
666 6, /* DNS server */
667 12, /* Host name */
668 15, /* Domain name */
669 17, /* Boot path */
670 26, /* MTU */
671 40, /* NIS domain name */
672 };
673
674 *e++ = 55; /* Parameter request list */
675 *e++ = sizeof(ic_req_params);
676 memcpy(e, ic_req_params, sizeof(ic_req_params));
677 e += sizeof(ic_req_params);
678
679 if (ic_host_name_set) {
680 *e++ = 12; /* host-name */
681 len = strlen(utsname()->nodename);
682 *e++ = len;
683 memcpy(e, utsname()->nodename, len);
684 e += len;
685 }
686 if (*vendor_class_identifier) {
687 printk(KERN_INFO "DHCP: sending class identifier \"%s\"\n",
688 vendor_class_identifier);
689 *e++ = 60; /* Class-identifier */
690 len = strlen(vendor_class_identifier);
691 *e++ = len;
692 memcpy(e, vendor_class_identifier, len);
693 e += len;
694 }
695 }
696
697 *e++ = 255; /* End of the list */
698 }
699
700 #endif /* IPCONFIG_DHCP */
701
702 static void __init ic_bootp_init_ext(u8 *e)
703 {
704 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */
705 e += 4;
706 *e++ = 1; /* Subnet mask request */
707 *e++ = 4;
708 e += 4;
709 *e++ = 3; /* Default gateway request */
710 *e++ = 4;
711 e += 4;
712 *e++ = 5; /* Name server request */
713 *e++ = 8;
714 e += 8;
715 *e++ = 12; /* Host name request */
716 *e++ = 32;
717 e += 32;
718 *e++ = 40; /* NIS Domain name request */
719 *e++ = 32;
720 e += 32;
721 *e++ = 17; /* Boot path */
722 *e++ = 40;
723 e += 40;
724
725 *e++ = 57; /* set extension buffer size for reply */
726 *e++ = 2;
727 *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */
728 *e++ = 150;
729
730 *e++ = 255; /* End of the list */
731 }
732
733
734 /*
735 * Initialize the DHCP/BOOTP mechanism.
736 */
737 static inline void __init ic_bootp_init(void)
738 {
739 int i;
740
741 for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
742 ic_nameservers[i] = NONE;
743
744 dev_add_pack(&bootp_packet_type);
745 }
746
747
748 /*
749 * DHCP/BOOTP cleanup.
750 */
751 static inline void __init ic_bootp_cleanup(void)
752 {
753 dev_remove_pack(&bootp_packet_type);
754 }
755
756
757 /*
758 * Send DHCP/BOOTP request to single interface.
759 */
760 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff)
761 {
762 struct net_device *dev = d->dev;
763 struct sk_buff *skb;
764 struct bootp_pkt *b;
765 struct iphdr *h;
766
767 /* Allocate packet */
768 skb = alloc_skb(sizeof(struct bootp_pkt) + LL_ALLOCATED_SPACE(dev) + 15,
769 GFP_KERNEL);
770 if (!skb)
771 return;
772 skb_reserve(skb, LL_RESERVED_SPACE(dev));
773 b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt));
774 memset(b, 0, sizeof(struct bootp_pkt));
775
776 /* Construct IP header */
777 skb_reset_network_header(skb);
778 h = ip_hdr(skb);
779 h->version = 4;
780 h->ihl = 5;
781 h->tot_len = htons(sizeof(struct bootp_pkt));
782 h->frag_off = htons(IP_DF);
783 h->ttl = 64;
784 h->protocol = IPPROTO_UDP;
785 h->daddr = htonl(INADDR_BROADCAST);
786 h->check = ip_fast_csum((unsigned char *) h, h->ihl);
787
788 /* Construct UDP header */
789 b->udph.source = htons(68);
790 b->udph.dest = htons(67);
791 b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr));
792 /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */
793
794 /* Construct DHCP/BOOTP header */
795 b->op = BOOTP_REQUEST;
796 if (dev->type < 256) /* check for false types */
797 b->htype = dev->type;
798 else if (dev->type == ARPHRD_IEEE802_TR) /* fix for token ring */
799 b->htype = ARPHRD_IEEE802;
800 else if (dev->type == ARPHRD_FDDI)
801 b->htype = ARPHRD_ETHER;
802 else {
803 printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name);
804 b->htype = dev->type; /* can cause undefined behavior */
805 }
806
807 /* server_ip and your_ip address are both already zero per RFC2131 */
808 b->hlen = dev->addr_len;
809 memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
810 b->secs = htons(jiffies_diff / HZ);
811 b->xid = d->xid;
812
813 /* add DHCP options or BOOTP extensions */
814 #ifdef IPCONFIG_DHCP
815 if (ic_proto_enabled & IC_USE_DHCP)
816 ic_dhcp_init_options(b->exten);
817 else
818 #endif
819 ic_bootp_init_ext(b->exten);
820
821 /* Chain packet down the line... */
822 skb->dev = dev;
823 skb->protocol = htons(ETH_P_IP);
824 if (dev_hard_header(skb, dev, ntohs(skb->protocol),
825 dev->broadcast, dev->dev_addr, skb->len) < 0 ||
826 dev_queue_xmit(skb) < 0)
827 printk("E");
828 }
829
830
831 /*
832 * Copy BOOTP-supplied string if not already set.
833 */
834 static int __init ic_bootp_string(char *dest, char *src, int len, int max)
835 {
836 if (!len)
837 return 0;
838 if (len > max-1)
839 len = max-1;
840 memcpy(dest, src, len);
841 dest[len] = '\0';
842 return 1;
843 }
844
845
846 /*
847 * Process BOOTP extensions.
848 */
849 static void __init ic_do_bootp_ext(u8 *ext)
850 {
851 u8 servers;
852 int i;
853 u16 mtu;
854
855 #ifdef IPCONFIG_DEBUG
856 u8 *c;
857
858 printk("DHCP/BOOTP: Got extension %d:",*ext);
859 for (c=ext+2; c<ext+2+ext[1]; c++)
860 printk(" %02x", *c);
861 printk("\n");
862 #endif
863
864 switch (*ext++) {
865 case 1: /* Subnet mask */
866 if (ic_netmask == NONE)
867 memcpy(&ic_netmask, ext+1, 4);
868 break;
869 case 3: /* Default gateway */
870 if (ic_gateway == NONE)
871 memcpy(&ic_gateway, ext+1, 4);
872 break;
873 case 6: /* DNS server */
874 servers= *ext/4;
875 if (servers > CONF_NAMESERVERS_MAX)
876 servers = CONF_NAMESERVERS_MAX;
877 for (i = 0; i < servers; i++) {
878 if (ic_nameservers[i] == NONE)
879 memcpy(&ic_nameservers[i], ext+1+4*i, 4);
880 }
881 break;
882 case 12: /* Host name */
883 ic_bootp_string(utsname()->nodename, ext+1, *ext,
884 __NEW_UTS_LEN);
885 ic_host_name_set = 1;
886 break;
887 case 15: /* Domain name (DNS) */
888 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
889 break;
890 case 17: /* Root path */
891 if (!root_server_path[0])
892 ic_bootp_string(root_server_path, ext+1, *ext,
893 sizeof(root_server_path));
894 break;
895 case 26: /* Interface MTU */
896 memcpy(&mtu, ext+1, sizeof(mtu));
897 ic_dev_mtu = ntohs(mtu);
898 break;
899 case 40: /* NIS Domain name (_not_ DNS) */
900 ic_bootp_string(utsname()->domainname, ext+1, *ext,
901 __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 (ip_is_fragment(h)) {
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