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Linux 3.8-rc7
[cris-mirror.git] / net / ipv4 / ipconfig.c
bloba2e50ae80b53361ca30c718dce7e85b5e4e7c66c
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_addrservaddr = NONE; /* IP Address of the IP addresses'server */
140
141 __be32 ic_servaddr = NONE; /* Boot server IP address */
142
143 __be32 root_server_addr = NONE; /* Address of NFS server */
144 u8 root_server_path[256] = { 0, }; /* Path to mount as root */
145
146 __be32 ic_dev_xid; /* Device under configuration */
147
148 /* vendor class identifier */
149 static char vendor_class_identifier[253] __initdata;
150
151 /* Persistent data: */
152
153 static int ic_proto_used; /* Protocol used, if any */
154 static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */
155 static u8 ic_domain[64]; /* DNS (not NIS) domain name */
156
157 /*
158 * Private state.
159 */
160
161 /* Name of user-selected boot device */
162 static char user_dev_name[IFNAMSIZ] __initdata = { 0, };
163
164 /* Protocols supported by available interfaces */
165 static int ic_proto_have_if __initdata = 0;
166
167 /* MTU for boot device */
168 static int ic_dev_mtu __initdata = 0;
169
170 #ifdef IPCONFIG_DYNAMIC
171 static DEFINE_SPINLOCK(ic_recv_lock);
172 static volatile int ic_got_reply __initdata = 0; /* Proto(s) that replied */
173 #endif
174 #ifdef IPCONFIG_DHCP
175 static int ic_dhcp_msgtype __initdata = 0; /* DHCP msg type received */
176 #endif
177
178
179 /*
180 * Network devices
181 */
182
183 struct ic_device {
184 struct ic_device *next;
185 struct net_device *dev;
186 unsigned short flags;
187 short able;
188 __be32 xid;
189 };
190
191 static struct ic_device *ic_first_dev __initdata = NULL;/* List of open device */
192 static struct net_device *ic_dev __initdata = NULL; /* Selected device */
193
194 static bool __init ic_is_init_dev(struct net_device *dev)
195 {
196 if (dev->flags & IFF_LOOPBACK)
197 return false;
198 return user_dev_name[0] ? !strcmp(dev->name, user_dev_name) :
199 (!(dev->flags & IFF_LOOPBACK) &&
200 (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) &&
201 strncmp(dev->name, "dummy", 5));
202 }
203
204 static int __init ic_open_devs(void)
205 {
206 struct ic_device *d, **last;
207 struct net_device *dev;
208 unsigned short oflags;
209 unsigned long start;
210
211 last = &ic_first_dev;
212 rtnl_lock();
213
214 /* bring loopback device up first */
215 for_each_netdev(&init_net, dev) {
216 if (!(dev->flags & IFF_LOOPBACK))
217 continue;
218 if (dev_change_flags(dev, dev->flags | IFF_UP) < 0)
219 pr_err("IP-Config: Failed to open %s\n", dev->name);
220 }
221
222 for_each_netdev(&init_net, dev) {
223 if (ic_is_init_dev(dev)) {
224 int able = 0;
225 if (dev->mtu >= 364)
226 able |= IC_BOOTP;
227 else
228 pr_warn("DHCP/BOOTP: Ignoring device %s, MTU %d too small",
229 dev->name, dev->mtu);
230 if (!(dev->flags & IFF_NOARP))
231 able |= IC_RARP;
232 able &= ic_proto_enabled;
233 if (ic_proto_enabled && !able)
234 continue;
235 oflags = dev->flags;
236 if (dev_change_flags(dev, oflags | IFF_UP) < 0) {
237 pr_err("IP-Config: Failed to open %s\n",
238 dev->name);
239 continue;
240 }
241 if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) {
242 rtnl_unlock();
243 return -ENOMEM;
244 }
245 d->dev = dev;
246 *last = d;
247 last = &d->next;
248 d->flags = oflags;
249 d->able = able;
250 if (able & IC_BOOTP)
251 get_random_bytes(&d->xid, sizeof(__be32));
252 else
253 d->xid = 0;
254 ic_proto_have_if |= able;
255 DBG(("IP-Config: %s UP (able=%d, xid=%08x)\n",
256 dev->name, able, d->xid));
257 }
258 }
259
260 /* no point in waiting if we could not bring up at least one device */
261 if (!ic_first_dev)
262 goto have_carrier;
263
264 /* wait for a carrier on at least one device */
265 start = jiffies;
266 while (jiffies - start < msecs_to_jiffies(CONF_CARRIER_TIMEOUT)) {
267 for_each_netdev(&init_net, dev)
268 if (ic_is_init_dev(dev) && netif_carrier_ok(dev))
269 goto have_carrier;
270
271 msleep(1);
272 }
273 have_carrier:
274 rtnl_unlock();
275
276 *last = NULL;
277
278 if (!ic_first_dev) {
279 if (user_dev_name[0])
280 pr_err("IP-Config: Device `%s' not found\n",
281 user_dev_name);
282 else
283 pr_err("IP-Config: No network devices available\n");
284 return -ENODEV;
285 }
286 return 0;
287 }
288
289 static void __init ic_close_devs(void)
290 {
291 struct ic_device *d, *next;
292 struct net_device *dev;
293
294 rtnl_lock();
295 next = ic_first_dev;
296 while ((d = next)) {
297 next = d->next;
298 dev = d->dev;
299 if (dev != ic_dev) {
300 DBG(("IP-Config: Downing %s\n", dev->name));
301 dev_change_flags(dev, d->flags);
302 }
303 kfree(d);
304 }
305 rtnl_unlock();
306 }
307
308 /*
309 * Interface to various network functions.
310 */
311
312 static inline void
313 set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port)
314 {
315 sin->sin_family = AF_INET;
316 sin->sin_addr.s_addr = addr;
317 sin->sin_port = port;
318 }
319
320 static int __init ic_devinet_ioctl(unsigned int cmd, struct ifreq *arg)
321 {
322 int res;
323
324 mm_segment_t oldfs = get_fs();
325 set_fs(get_ds());
326 res = devinet_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
327 set_fs(oldfs);
328 return res;
329 }
330
331 static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg)
332 {
333 int res;
334
335 mm_segment_t oldfs = get_fs();
336 set_fs(get_ds());
337 res = dev_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
338 set_fs(oldfs);
339 return res;
340 }
341
342 static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg)
343 {
344 int res;
345
346 mm_segment_t oldfs = get_fs();
347 set_fs(get_ds());
348 res = ip_rt_ioctl(&init_net, cmd, (void __user *) arg);
349 set_fs(oldfs);
350 return res;
351 }
352
353 /*
354 * Set up interface addresses and routes.
355 */
356
357 static int __init ic_setup_if(void)
358 {
359 struct ifreq ir;
360 struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr;
361 int err;
362
363 memset(&ir, 0, sizeof(ir));
364 strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name);
365 set_sockaddr(sin, ic_myaddr, 0);
366 if ((err = ic_devinet_ioctl(SIOCSIFADDR, &ir)) < 0) {
367 pr_err("IP-Config: Unable to set interface address (%d)\n",
368 err);
369 return -1;
370 }
371 set_sockaddr(sin, ic_netmask, 0);
372 if ((err = ic_devinet_ioctl(SIOCSIFNETMASK, &ir)) < 0) {
373 pr_err("IP-Config: Unable to set interface netmask (%d)\n",
374 err);
375 return -1;
376 }
377 set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0);
378 if ((err = ic_devinet_ioctl(SIOCSIFBRDADDR, &ir)) < 0) {
379 pr_err("IP-Config: Unable to set interface broadcast address (%d)\n",
380 err);
381 return -1;
382 }
383 /* Handle the case where we need non-standard MTU on the boot link (a network
384 * using jumbo frames, for instance). If we can't set the mtu, don't error
385 * out, we'll try to muddle along.
386 */
387 if (ic_dev_mtu != 0) {
388 strcpy(ir.ifr_name, ic_dev->name);
389 ir.ifr_mtu = ic_dev_mtu;
390 if ((err = ic_dev_ioctl(SIOCSIFMTU, &ir)) < 0)
391 pr_err("IP-Config: Unable to set interface mtu to %d (%d)\n",
392 ic_dev_mtu, err);
393 }
394 return 0;
395 }
396
397 static int __init ic_setup_routes(void)
398 {
399 /* No need to setup device routes, only the default route... */
400
401 if (ic_gateway != NONE) {
402 struct rtentry rm;
403 int err;
404
405 memset(&rm, 0, sizeof(rm));
406 if ((ic_gateway ^ ic_myaddr) & ic_netmask) {
407 pr_err("IP-Config: Gateway not on directly connected network\n");
408 return -1;
409 }
410 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0);
411 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0);
412 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0);
413 rm.rt_flags = RTF_UP | RTF_GATEWAY;
414 if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) {
415 pr_err("IP-Config: Cannot add default route (%d)\n",
416 err);
417 return -1;
418 }
419 }
420
421 return 0;
422 }
423
424 /*
425 * Fill in default values for all missing parameters.
426 */
427
428 static int __init ic_defaults(void)
429 {
430 /*
431 * At this point we have no userspace running so need not
432 * claim locks on system_utsname
433 */
434
435 if (!ic_host_name_set)
436 sprintf(init_utsname()->nodename, "%pI4", &ic_myaddr);
437
438 if (root_server_addr == NONE)
439 root_server_addr = ic_servaddr;
440
441 if (ic_netmask == NONE) {
442 if (IN_CLASSA(ntohl(ic_myaddr)))
443 ic_netmask = htonl(IN_CLASSA_NET);
444 else if (IN_CLASSB(ntohl(ic_myaddr)))
445 ic_netmask = htonl(IN_CLASSB_NET);
446 else if (IN_CLASSC(ntohl(ic_myaddr)))
447 ic_netmask = htonl(IN_CLASSC_NET);
448 else {
449 pr_err("IP-Config: Unable to guess netmask for address %pI4\n",
450 &ic_myaddr);
451 return -1;
452 }
453 printk("IP-Config: Guessing netmask %pI4\n", &ic_netmask);
454 }
455
456 return 0;
457 }
458
459 /*
460 * RARP support.
461 */
462
463 #ifdef IPCONFIG_RARP
464
465 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
466
467 static struct packet_type rarp_packet_type __initdata = {
468 .type = cpu_to_be16(ETH_P_RARP),
469 .func = ic_rarp_recv,
470 };
471
472 static inline void __init ic_rarp_init(void)
473 {
474 dev_add_pack(&rarp_packet_type);
475 }
476
477 static inline void __init ic_rarp_cleanup(void)
478 {
479 dev_remove_pack(&rarp_packet_type);
480 }
481
482 /*
483 * Process received RARP packet.
484 */
485 static int __init
486 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
487 {
488 struct arphdr *rarp;
489 unsigned char *rarp_ptr;
490 __be32 sip, tip;
491 unsigned char *sha, *tha; /* s for "source", t for "target" */
492 struct ic_device *d;
493
494 if (!net_eq(dev_net(dev), &init_net))
495 goto drop;
496
497 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
498 return NET_RX_DROP;
499
500 if (!pskb_may_pull(skb, sizeof(struct arphdr)))
501 goto drop;
502
503 /* Basic sanity checks can be done without the lock. */
504 rarp = (struct arphdr *)skb_transport_header(skb);
505
506 /* If this test doesn't pass, it's not IP, or we should
507 * ignore it anyway.
508 */
509 if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd))
510 goto drop;
511
512 /* If it's not a RARP reply, delete it. */
513 if (rarp->ar_op != htons(ARPOP_RREPLY))
514 goto drop;
515
516 /* If it's not Ethernet, delete it. */
517 if (rarp->ar_pro != htons(ETH_P_IP))
518 goto drop;
519
520 if (!pskb_may_pull(skb, arp_hdr_len(dev)))
521 goto drop;
522
523 /* OK, it is all there and looks valid, process... */
524 rarp = (struct arphdr *)skb_transport_header(skb);
525 rarp_ptr = (unsigned char *) (rarp + 1);
526
527 /* One reply at a time, please. */
528 spin_lock(&ic_recv_lock);
529
530 /* If we already have a reply, just drop the packet */
531 if (ic_got_reply)
532 goto drop_unlock;
533
534 /* Find the ic_device that the packet arrived on */
535 d = ic_first_dev;
536 while (d && d->dev != dev)
537 d = d->next;
538 if (!d)
539 goto drop_unlock; /* should never happen */
540
541 /* Extract variable-width fields */
542 sha = rarp_ptr;
543 rarp_ptr += dev->addr_len;
544 memcpy(&sip, rarp_ptr, 4);
545 rarp_ptr += 4;
546 tha = rarp_ptr;
547 rarp_ptr += dev->addr_len;
548 memcpy(&tip, rarp_ptr, 4);
549
550 /* Discard packets which are not meant for us. */
551 if (memcmp(tha, dev->dev_addr, dev->addr_len))
552 goto drop_unlock;
553
554 /* Discard packets which are not from specified server. */
555 if (ic_servaddr != NONE && ic_servaddr != sip)
556 goto drop_unlock;
557
558 /* We have a winner! */
559 ic_dev = dev;
560 if (ic_myaddr == NONE)
561 ic_myaddr = tip;
562 ic_servaddr = sip;
563 ic_addrservaddr = sip;
564 ic_got_reply = IC_RARP;
565
566 drop_unlock:
567 /* Show's over. Nothing to see here. */
568 spin_unlock(&ic_recv_lock);
569
570 drop:
571 /* Throw the packet out. */
572 kfree_skb(skb);
573 return 0;
574 }
575
576
577 /*
578 * Send RARP request packet over a single interface.
579 */
580 static void __init ic_rarp_send_if(struct ic_device *d)
581 {
582 struct net_device *dev = d->dev;
583 arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL,
584 dev->dev_addr, dev->dev_addr);
585 }
586 #endif
587
588 /*
589 * Predefine Nameservers
590 */
591 static inline void __init ic_nameservers_predef(void)
592 {
593 int i;
594
595 for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
596 ic_nameservers[i] = NONE;
597 }
598
599 /*
600 * DHCP/BOOTP support.
601 */
602
603 #ifdef IPCONFIG_BOOTP
604
605 struct bootp_pkt { /* BOOTP packet format */
606 struct iphdr iph; /* IP header */
607 struct udphdr udph; /* UDP header */
608 u8 op; /* 1=request, 2=reply */
609 u8 htype; /* HW address type */
610 u8 hlen; /* HW address length */
611 u8 hops; /* Used only by gateways */
612 __be32 xid; /* Transaction ID */
613 __be16 secs; /* Seconds since we started */
614 __be16 flags; /* Just what it says */
615 __be32 client_ip; /* Client's IP address if known */
616 __be32 your_ip; /* Assigned IP address */
617 __be32 server_ip; /* (Next, e.g. NFS) Server's IP address */
618 __be32 relay_ip; /* IP address of BOOTP relay */
619 u8 hw_addr[16]; /* Client's HW address */
620 u8 serv_name[64]; /* Server host name */
621 u8 boot_file[128]; /* Name of boot file */
622 u8 exten[312]; /* DHCP options / BOOTP vendor extensions */
623 };
624
625 /* packet ops */
626 #define BOOTP_REQUEST 1
627 #define BOOTP_REPLY 2
628
629 /* DHCP message types */
630 #define DHCPDISCOVER 1
631 #define DHCPOFFER 2
632 #define DHCPREQUEST 3
633 #define DHCPDECLINE 4
634 #define DHCPACK 5
635 #define DHCPNAK 6
636 #define DHCPRELEASE 7
637 #define DHCPINFORM 8
638
639 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
640
641 static struct packet_type bootp_packet_type __initdata = {
642 .type = cpu_to_be16(ETH_P_IP),
643 .func = ic_bootp_recv,
644 };
645
646
647 /*
648 * Initialize DHCP/BOOTP extension fields in the request.
649 */
650
651 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 };
652
653 #ifdef IPCONFIG_DHCP
654
655 static void __init
656 ic_dhcp_init_options(u8 *options)
657 {
658 u8 mt = ((ic_servaddr == NONE)
659 ? DHCPDISCOVER : DHCPREQUEST);
660 u8 *e = options;
661 int len;
662
663 #ifdef IPCONFIG_DEBUG
664 printk("DHCP: Sending message type %d\n", mt);
665 #endif
666
667 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */
668 e += 4;
669
670 *e++ = 53; /* DHCP message type */
671 *e++ = 1;
672 *e++ = mt;
673
674 if (mt == DHCPREQUEST) {
675 *e++ = 54; /* Server ID (IP address) */
676 *e++ = 4;
677 memcpy(e, &ic_servaddr, 4);
678 e += 4;
679
680 *e++ = 50; /* Requested IP address */
681 *e++ = 4;
682 memcpy(e, &ic_myaddr, 4);
683 e += 4;
684 }
685
686 /* always? */
687 {
688 static const u8 ic_req_params[] = {
689 1, /* Subnet mask */
690 3, /* Default gateway */
691 6, /* DNS server */
692 12, /* Host name */
693 15, /* Domain name */
694 17, /* Boot path */
695 26, /* MTU */
696 40, /* NIS domain name */
697 };
698
699 *e++ = 55; /* Parameter request list */
700 *e++ = sizeof(ic_req_params);
701 memcpy(e, ic_req_params, sizeof(ic_req_params));
702 e += sizeof(ic_req_params);
703
704 if (ic_host_name_set) {
705 *e++ = 12; /* host-name */
706 len = strlen(utsname()->nodename);
707 *e++ = len;
708 memcpy(e, utsname()->nodename, len);
709 e += len;
710 }
711 if (*vendor_class_identifier) {
712 pr_info("DHCP: sending class identifier \"%s\"\n",
713 vendor_class_identifier);
714 *e++ = 60; /* Class-identifier */
715 len = strlen(vendor_class_identifier);
716 *e++ = len;
717 memcpy(e, vendor_class_identifier, len);
718 e += len;
719 }
720 }
721
722 *e++ = 255; /* End of the list */
723 }
724
725 #endif /* IPCONFIG_DHCP */
726
727 static void __init ic_bootp_init_ext(u8 *e)
728 {
729 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */
730 e += 4;
731 *e++ = 1; /* Subnet mask request */
732 *e++ = 4;
733 e += 4;
734 *e++ = 3; /* Default gateway request */
735 *e++ = 4;
736 e += 4;
737 *e++ = 5; /* Name server request */
738 *e++ = 8;
739 e += 8;
740 *e++ = 12; /* Host name request */
741 *e++ = 32;
742 e += 32;
743 *e++ = 40; /* NIS Domain name request */
744 *e++ = 32;
745 e += 32;
746 *e++ = 17; /* Boot path */
747 *e++ = 40;
748 e += 40;
749
750 *e++ = 57; /* set extension buffer size for reply */
751 *e++ = 2;
752 *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */
753 *e++ = 150;
754
755 *e++ = 255; /* End of the list */
756 }
757
758
759 /*
760 * Initialize the DHCP/BOOTP mechanism.
761 */
762 static inline void __init ic_bootp_init(void)
763 {
764 ic_nameservers_predef();
765
766 dev_add_pack(&bootp_packet_type);
767 }
768
769
770 /*
771 * DHCP/BOOTP cleanup.
772 */
773 static inline void __init ic_bootp_cleanup(void)
774 {
775 dev_remove_pack(&bootp_packet_type);
776 }
777
778
779 /*
780 * Send DHCP/BOOTP request to single interface.
781 */
782 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff)
783 {
784 struct net_device *dev = d->dev;
785 struct sk_buff *skb;
786 struct bootp_pkt *b;
787 struct iphdr *h;
788 int hlen = LL_RESERVED_SPACE(dev);
789 int tlen = dev->needed_tailroom;
790
791 /* Allocate packet */
792 skb = alloc_skb(sizeof(struct bootp_pkt) + hlen + tlen + 15,
793 GFP_KERNEL);
794 if (!skb)
795 return;
796 skb_reserve(skb, hlen);
797 b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt));
798 memset(b, 0, sizeof(struct bootp_pkt));
799
800 /* Construct IP header */
801 skb_reset_network_header(skb);
802 h = ip_hdr(skb);
803 h->version = 4;
804 h->ihl = 5;
805 h->tot_len = htons(sizeof(struct bootp_pkt));
806 h->frag_off = htons(IP_DF);
807 h->ttl = 64;
808 h->protocol = IPPROTO_UDP;
809 h->daddr = htonl(INADDR_BROADCAST);
810 h->check = ip_fast_csum((unsigned char *) h, h->ihl);
811
812 /* Construct UDP header */
813 b->udph.source = htons(68);
814 b->udph.dest = htons(67);
815 b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr));
816 /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */
817
818 /* Construct DHCP/BOOTP header */
819 b->op = BOOTP_REQUEST;
820 if (dev->type < 256) /* check for false types */
821 b->htype = dev->type;
822 else if (dev->type == ARPHRD_FDDI)
823 b->htype = ARPHRD_ETHER;
824 else {
825 printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name);
826 b->htype = dev->type; /* can cause undefined behavior */
827 }
828
829 /* server_ip and your_ip address are both already zero per RFC2131 */
830 b->hlen = dev->addr_len;
831 memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
832 b->secs = htons(jiffies_diff / HZ);
833 b->xid = d->xid;
834
835 /* add DHCP options or BOOTP extensions */
836 #ifdef IPCONFIG_DHCP
837 if (ic_proto_enabled & IC_USE_DHCP)
838 ic_dhcp_init_options(b->exten);
839 else
840 #endif
841 ic_bootp_init_ext(b->exten);
842
843 /* Chain packet down the line... */
844 skb->dev = dev;
845 skb->protocol = htons(ETH_P_IP);
846 if (dev_hard_header(skb, dev, ntohs(skb->protocol),
847 dev->broadcast, dev->dev_addr, skb->len) < 0) {
848 kfree_skb(skb);
849 printk("E");
850 return;
851 }
852
853 if (dev_queue_xmit(skb) < 0)
854 printk("E");
855 }
856
857
858 /*
859 * Copy BOOTP-supplied string if not already set.
860 */
861 static int __init ic_bootp_string(char *dest, char *src, int len, int max)
862 {
863 if (!len)
864 return 0;
865 if (len > max-1)
866 len = max-1;
867 memcpy(dest, src, len);
868 dest[len] = '\0';
869 return 1;
870 }
871
872
873 /*
874 * Process BOOTP extensions.
875 */
876 static void __init ic_do_bootp_ext(u8 *ext)
877 {
878 u8 servers;
879 int i;
880 __be16 mtu;
881
882 #ifdef IPCONFIG_DEBUG
883 u8 *c;
884
885 printk("DHCP/BOOTP: Got extension %d:",*ext);
886 for (c=ext+2; c<ext+2+ext[1]; c++)
887 printk(" %02x", *c);
888 printk("\n");
889 #endif
890
891 switch (*ext++) {
892 case 1: /* Subnet mask */
893 if (ic_netmask == NONE)
894 memcpy(&ic_netmask, ext+1, 4);
895 break;
896 case 3: /* Default gateway */
897 if (ic_gateway == NONE)
898 memcpy(&ic_gateway, ext+1, 4);
899 break;
900 case 6: /* DNS server */
901 servers= *ext/4;
902 if (servers > CONF_NAMESERVERS_MAX)
903 servers = CONF_NAMESERVERS_MAX;
904 for (i = 0; i < servers; i++) {
905 if (ic_nameservers[i] == NONE)
906 memcpy(&ic_nameservers[i], ext+1+4*i, 4);
907 }
908 break;
909 case 12: /* Host name */
910 ic_bootp_string(utsname()->nodename, ext+1, *ext,
911 __NEW_UTS_LEN);
912 ic_host_name_set = 1;
913 break;
914 case 15: /* Domain name (DNS) */
915 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
916 break;
917 case 17: /* Root path */
918 if (!root_server_path[0])
919 ic_bootp_string(root_server_path, ext+1, *ext,
920 sizeof(root_server_path));
921 break;
922 case 26: /* Interface MTU */
923 memcpy(&mtu, ext+1, sizeof(mtu));
924 ic_dev_mtu = ntohs(mtu);
925 break;
926 case 40: /* NIS Domain name (_not_ DNS) */
927 ic_bootp_string(utsname()->domainname, ext+1, *ext,
928 __NEW_UTS_LEN);
929 break;
930 }
931 }
932
933
934 /*
935 * Receive BOOTP reply.
936 */
937 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
938 {
939 struct bootp_pkt *b;
940 struct iphdr *h;
941 struct ic_device *d;
942 int len, ext_len;
943
944 if (!net_eq(dev_net(dev), &init_net))
945 goto drop;
946
947 /* Perform verifications before taking the lock. */
948 if (skb->pkt_type == PACKET_OTHERHOST)
949 goto drop;
950
951 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
952 return NET_RX_DROP;
953
954 if (!pskb_may_pull(skb,
955 sizeof(struct iphdr) +
956 sizeof(struct udphdr)))
957 goto drop;
958
959 b = (struct bootp_pkt *)skb_network_header(skb);
960 h = &b->iph;
961
962 if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP)
963 goto drop;
964
965 /* Fragments are not supported */
966 if (ip_is_fragment(h)) {
967 net_err_ratelimited("DHCP/BOOTP: Ignoring fragmented reply\n");
968 goto drop;
969 }
970
971 if (skb->len < ntohs(h->tot_len))
972 goto drop;
973
974 if (ip_fast_csum((char *) h, h->ihl))
975 goto drop;
976
977 if (b->udph.source != htons(67) || b->udph.dest != htons(68))
978 goto drop;
979
980 if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
981 goto drop;
982
983 len = ntohs(b->udph.len) - sizeof(struct udphdr);
984 ext_len = len - (sizeof(*b) -
985 sizeof(struct iphdr) -
986 sizeof(struct udphdr) -
987 sizeof(b->exten));
988 if (ext_len < 0)
989 goto drop;
990
991 /* Ok the front looks good, make sure we can get at the rest. */
992 if (!pskb_may_pull(skb, skb->len))
993 goto drop;
994
995 b = (struct bootp_pkt *)skb_network_header(skb);
996 h = &b->iph;
997
998 /* One reply at a time, please. */
999 spin_lock(&ic_recv_lock);
1000
1001 /* If we already have a reply, just drop the packet */
1002 if (ic_got_reply)
1003 goto drop_unlock;
1004
1005 /* Find the ic_device that the packet arrived on */
1006 d = ic_first_dev;
1007 while (d && d->dev != dev)
1008 d = d->next;
1009 if (!d)
1010 goto drop_unlock; /* should never happen */
1011
1012 /* Is it a reply to our BOOTP request? */
1013 if (b->op != BOOTP_REPLY ||
1014 b->xid != d->xid) {
1015 net_err_ratelimited("DHCP/BOOTP: Reply not for us, op[%x] xid[%x]\n",
1016 b->op, b->xid);
1017 goto drop_unlock;
1018 }
1019
1020 /* Is it a reply for the device we are configuring? */
1021 if (b->xid != ic_dev_xid) {
1022 net_err_ratelimited("DHCP/BOOTP: Ignoring delayed packet\n");
1023 goto drop_unlock;
1024 }
1025
1026 /* Parse extensions */
1027 if (ext_len >= 4 &&
1028 !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */
1029 u8 *end = (u8 *) b + ntohs(b->iph.tot_len);
1030 u8 *ext;
1031
1032 #ifdef IPCONFIG_DHCP
1033 if (ic_proto_enabled & IC_USE_DHCP) {
1034 __be32 server_id = NONE;
1035 int mt = 0;
1036
1037 ext = &b->exten[4];
1038 while (ext < end && *ext != 0xff) {
1039 u8 *opt = ext++;
1040 if (*opt == 0) /* Padding */
1041 continue;
1042 ext += *ext + 1;
1043 if (ext >= end)
1044 break;
1045 switch (*opt) {
1046 case 53: /* Message type */
1047 if (opt[1])
1048 mt = opt[2];
1049 break;
1050 case 54: /* Server ID (IP address) */
1051 if (opt[1] >= 4)
1052 memcpy(&server_id, opt + 2, 4);
1053 break;
1054 }
1055 }
1056
1057 #ifdef IPCONFIG_DEBUG
1058 printk("DHCP: Got message type %d\n", mt);
1059 #endif
1060
1061 switch (mt) {
1062 case DHCPOFFER:
1063 /* While in the process of accepting one offer,
1064 * ignore all others.
1065 */
1066 if (ic_myaddr != NONE)
1067 goto drop_unlock;
1068
1069 /* Let's accept that offer. */
1070 ic_myaddr = b->your_ip;
1071 ic_servaddr = server_id;
1072 #ifdef IPCONFIG_DEBUG
1073 printk("DHCP: Offered address %pI4 by server %pI4\n",
1074 &ic_myaddr, &b->iph.saddr);
1075 #endif
1076 /* The DHCP indicated server address takes
1077 * precedence over the bootp header one if
1078 * they are different.
1079 */
1080 if ((server_id != NONE) &&
1081 (b->server_ip != server_id))
1082 b->server_ip = ic_servaddr;
1083 break;
1084
1085 case DHCPACK:
1086 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0)
1087 goto drop_unlock;
1088
1089 /* Yeah! */
1090 break;
1091
1092 default:
1093 /* Urque. Forget it*/
1094 ic_myaddr = NONE;
1095 ic_servaddr = NONE;
1096 goto drop_unlock;
1097 }
1098
1099 ic_dhcp_msgtype = mt;
1100
1101 }
1102 #endif /* IPCONFIG_DHCP */
1103
1104 ext = &b->exten[4];
1105 while (ext < end && *ext != 0xff) {
1106 u8 *opt = ext++;
1107 if (*opt == 0) /* Padding */
1108 continue;
1109 ext += *ext + 1;
1110 if (ext < end)
1111 ic_do_bootp_ext(opt);
1112 }
1113 }
1114
1115 /* We have a winner! */
1116 ic_dev = dev;
1117 ic_myaddr = b->your_ip;
1118 ic_servaddr = b->server_ip;
1119 ic_addrservaddr = b->iph.saddr;
1120 if (ic_gateway == NONE && b->relay_ip)
1121 ic_gateway = b->relay_ip;
1122 if (ic_nameservers[0] == NONE)
1123 ic_nameservers[0] = ic_servaddr;
1124 ic_got_reply = IC_BOOTP;
1125
1126 drop_unlock:
1127 /* Show's over. Nothing to see here. */
1128 spin_unlock(&ic_recv_lock);
1129
1130 drop:
1131 /* Throw the packet out. */
1132 kfree_skb(skb);
1133
1134 return 0;
1135 }
1136
1137
1138 #endif
1139
1140
1141 /*
1142 * Dynamic IP configuration -- DHCP, BOOTP, RARP.
1143 */
1144
1145 #ifdef IPCONFIG_DYNAMIC
1146
1147 static int __init ic_dynamic(void)
1148 {
1149 int retries;
1150 struct ic_device *d;
1151 unsigned long start_jiffies, timeout, jiff;
1152 int do_bootp = ic_proto_have_if & IC_BOOTP;
1153 int do_rarp = ic_proto_have_if & IC_RARP;
1154
1155 /*
1156 * If none of DHCP/BOOTP/RARP was selected, return with an error.
1157 * This routine gets only called when some pieces of information
1158 * are missing, and without DHCP/BOOTP/RARP we are unable to get it.
1159 */
1160 if (!ic_proto_enabled) {
1161 pr_err("IP-Config: Incomplete network configuration information\n");
1162 return -1;
1163 }
1164
1165 #ifdef IPCONFIG_BOOTP
1166 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
1167 pr_err("DHCP/BOOTP: No suitable device found\n");
1168 #endif
1169 #ifdef IPCONFIG_RARP
1170 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)
1171 pr_err("RARP: No suitable device found\n");
1172 #endif
1173
1174 if (!ic_proto_have_if)
1175 /* Error message already printed */
1176 return -1;
1177
1178 /*
1179 * Setup protocols
1180 */
1181 #ifdef IPCONFIG_BOOTP
1182 if (do_bootp)
1183 ic_bootp_init();
1184 #endif
1185 #ifdef IPCONFIG_RARP
1186 if (do_rarp)
1187 ic_rarp_init();
1188 #endif
1189
1190 /*
1191 * Send requests and wait, until we get an answer. This loop
1192 * seems to be a terrible waste of CPU time, but actually there is
1193 * only one process running at all, so we don't need to use any
1194 * scheduler functions.
1195 * [Actually we could now, but the nothing else running note still
1196 * applies.. - AC]
1197 */
1198 pr_notice("Sending %s%s%s requests .",
1199 do_bootp
1200 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "",
1201 (do_bootp && do_rarp) ? " and " : "",
1202 do_rarp ? "RARP" : "");
1203
1204 start_jiffies = jiffies;
1205 d = ic_first_dev;
1206 retries = CONF_SEND_RETRIES;
1207 get_random_bytes(&timeout, sizeof(timeout));
1208 timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned int) CONF_TIMEOUT_RANDOM);
1209 for (;;) {
1210 /* Track the device we are configuring */
1211 ic_dev_xid = d->xid;
1212
1213 #ifdef IPCONFIG_BOOTP
1214 if (do_bootp && (d->able & IC_BOOTP))
1215 ic_bootp_send_if(d, jiffies - start_jiffies);
1216 #endif
1217 #ifdef IPCONFIG_RARP
1218 if (do_rarp && (d->able & IC_RARP))
1219 ic_rarp_send_if(d);
1220 #endif
1221
1222 jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout);
1223 while (time_before(jiffies, jiff) && !ic_got_reply)
1224 schedule_timeout_uninterruptible(1);
1225 #ifdef IPCONFIG_DHCP
1226 /* DHCP isn't done until we get a DHCPACK. */
1227 if ((ic_got_reply & IC_BOOTP) &&
1228 (ic_proto_enabled & IC_USE_DHCP) &&
1229 ic_dhcp_msgtype != DHCPACK) {
1230 ic_got_reply = 0;
1231 pr_cont(",");
1232 continue;
1233 }
1234 #endif /* IPCONFIG_DHCP */
1235
1236 if (ic_got_reply) {
1237 pr_cont(" OK\n");
1238 break;
1239 }
1240
1241 if ((d = d->next))
1242 continue;
1243
1244 if (! --retries) {
1245 pr_cont(" timed out!\n");
1246 break;
1247 }
1248
1249 d = ic_first_dev;
1250
1251 timeout = timeout CONF_TIMEOUT_MULT;
1252 if (timeout > CONF_TIMEOUT_MAX)
1253 timeout = CONF_TIMEOUT_MAX;
1254
1255 pr_cont(".");
1256 }
1257
1258 #ifdef IPCONFIG_BOOTP
1259 if (do_bootp)
1260 ic_bootp_cleanup();
1261 #endif
1262 #ifdef IPCONFIG_RARP
1263 if (do_rarp)
1264 ic_rarp_cleanup();
1265 #endif
1266
1267 if (!ic_got_reply) {
1268 ic_myaddr = NONE;
1269 return -1;
1270 }
1271
1272 printk("IP-Config: Got %s answer from %pI4, ",
1273 ((ic_got_reply & IC_RARP) ? "RARP"
1274 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),
1275 &ic_addrservaddr);
1276 pr_cont("my address is %pI4\n", &ic_myaddr);
1277
1278 return 0;
1279 }
1280
1281 #endif /* IPCONFIG_DYNAMIC */
1282
1283 #ifdef CONFIG_PROC_FS
1284
1285 static int pnp_seq_show(struct seq_file *seq, void *v)
1286 {
1287 int i;
1288
1289 if (ic_proto_used & IC_PROTO)
1290 seq_printf(seq, "#PROTO: %s\n",
1291 (ic_proto_used & IC_RARP) ? "RARP"
1292 : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP");
1293 else
1294 seq_puts(seq, "#MANUAL\n");
1295
1296 if (ic_domain[0])
1297 seq_printf(seq,
1298 "domain %s\n", ic_domain);
1299 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {
1300 if (ic_nameservers[i] != NONE)
1301 seq_printf(seq, "nameserver %pI4\n",
1302 &ic_nameservers[i]);
1303 }
1304 if (ic_servaddr != NONE)
1305 seq_printf(seq, "bootserver %pI4\n",
1306 &ic_servaddr);
1307 return 0;
1308 }
1309
1310 static int pnp_seq_open(struct inode *indoe, struct file *file)
1311 {
1312 return single_open(file, pnp_seq_show, NULL);
1313 }
1314
1315 static const struct file_operations pnp_seq_fops = {
1316 .owner = THIS_MODULE,
1317 .open = pnp_seq_open,
1318 .read = seq_read,
1319 .llseek = seq_lseek,
1320 .release = single_release,
1321 };
1322 #endif /* CONFIG_PROC_FS */
1323
1324 /*
1325 * Extract IP address from the parameter string if needed. Note that we
1326 * need to have root_server_addr set _before_ IPConfig gets called as it
1327 * can override it.
1328 */
1329 __be32 __init root_nfs_parse_addr(char *name)
1330 {
1331 __be32 addr;
1332 int octets = 0;
1333 char *cp, *cq;
1334
1335 cp = cq = name;
1336 while (octets < 4) {
1337 while (*cp >= '0' && *cp <= '9')
1338 cp++;
1339 if (cp == cq || cp - cq > 3)
1340 break;
1341 if (*cp == '.' || octets == 3)
1342 octets++;
1343 if (octets < 4)
1344 cp++;
1345 cq = cp;
1346 }
1347 if (octets == 4 && (*cp == ':' || *cp == '\0')) {
1348 if (*cp == ':')
1349 *cp++ = '\0';
1350 addr = in_aton(name);
1351 memmove(name, cp, strlen(cp) + 1);
1352 } else
1353 addr = NONE;
1354
1355 return addr;
1356 }
1357
1358 #define DEVICE_WAIT_MAX 12 /* 12 seconds */
1359
1360 static int __init wait_for_devices(void)
1361 {
1362 int i;
1363
1364 for (i = 0; i < DEVICE_WAIT_MAX; i++) {
1365 struct net_device *dev;
1366 int found = 0;
1367
1368 rtnl_lock();
1369 for_each_netdev(&init_net, dev) {
1370 if (ic_is_init_dev(dev)) {
1371 found = 1;
1372 break;
1373 }
1374 }
1375 rtnl_unlock();
1376 if (found)
1377 return 0;
1378 ssleep(1);
1379 }
1380 return -ENODEV;
1381 }
1382
1383 /*
1384 * IP Autoconfig dispatcher.
1385 */
1386
1387 static int __init ip_auto_config(void)
1388 {
1389 __be32 addr;
1390 #ifdef IPCONFIG_DYNAMIC
1391 int retries = CONF_OPEN_RETRIES;
1392 #endif
1393 int err;
1394 unsigned int i;
1395
1396 #ifdef CONFIG_PROC_FS
1397 proc_net_fops_create(&init_net, "pnp", S_IRUGO, &pnp_seq_fops);
1398 #endif /* CONFIG_PROC_FS */
1399
1400 if (!ic_enable)
1401 return 0;
1402
1403 DBG(("IP-Config: Entered.\n"));
1404 #ifdef IPCONFIG_DYNAMIC
1405 try_try_again:
1406 #endif
1407 /* Wait for devices to appear */
1408 err = wait_for_devices();
1409 if (err)
1410 return err;
1411
1412 /* Setup all network devices */
1413 err = ic_open_devs();
1414 if (err)
1415 return err;
1416
1417 /* Give drivers a chance to settle */
1418 msleep(CONF_POST_OPEN);
1419
1420 /*
1421 * If the config information is insufficient (e.g., our IP address or
1422 * IP address of the boot server is missing or we have multiple network
1423 * interfaces and no default was set), use BOOTP or RARP to get the
1424 * missing values.
1425 */
1426 if (ic_myaddr == NONE ||
1427 #ifdef CONFIG_ROOT_NFS
1428 (root_server_addr == NONE &&
1429 ic_servaddr == NONE &&
1430 ROOT_DEV == Root_NFS) ||
1431 #endif
1432 ic_first_dev->next) {
1433 #ifdef IPCONFIG_DYNAMIC
1434 if (ic_dynamic() < 0) {
1435 ic_close_devs();
1436
1437 /*
1438 * I don't know why, but sometimes the
1439 * eepro100 driver (at least) gets upset and
1440 * doesn't work the first time it's opened.
1441 * But then if you close it and reopen it, it
1442 * works just fine. So we need to try that at
1443 * least once before giving up.
1444 *
1445 * Also, if the root will be NFS-mounted, we
1446 * have nowhere to go if DHCP fails. So we
1447 * just have to keep trying forever.
1448 *
1449 * -- Chip
1450 */
1451 #ifdef CONFIG_ROOT_NFS
1452 if (ROOT_DEV == Root_NFS) {
1453 pr_err("IP-Config: Retrying forever (NFS root)...\n");
1454 goto try_try_again;
1455 }
1456 #endif
1457
1458 if (--retries) {
1459 pr_err("IP-Config: Reopening network devices...\n");
1460 goto try_try_again;
1461 }
1462
1463 /* Oh, well. At least we tried. */
1464 pr_err("IP-Config: Auto-configuration of network failed\n");
1465 return -1;
1466 }
1467 #else /* !DYNAMIC */
1468 pr_err("IP-Config: Incomplete network configuration information\n");
1469 ic_close_devs();
1470 return -1;
1471 #endif /* IPCONFIG_DYNAMIC */
1472 } else {
1473 /* Device selected manually or only one device -> use it */
1474 ic_dev = ic_first_dev->dev;
1475 }
1476
1477 addr = root_nfs_parse_addr(root_server_path);
1478 if (root_server_addr == NONE)
1479 root_server_addr = addr;
1480
1481 /*
1482 * Use defaults wherever applicable.
1483 */
1484 if (ic_defaults() < 0)
1485 return -1;
1486
1487 /*
1488 * Close all network devices except the device we've
1489 * autoconfigured and set up routes.
1490 */
1491 ic_close_devs();
1492 if (ic_setup_if() < 0 || ic_setup_routes() < 0)
1493 return -1;
1494
1495 /*
1496 * Record which protocol was actually used.
1497 */
1498 #ifdef IPCONFIG_DYNAMIC
1499 ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP);
1500 #endif
1501
1502 #ifndef IPCONFIG_SILENT
1503 /*
1504 * Clue in the operator.
1505 */
1506 pr_info("IP-Config: Complete:\n");
1507
1508 pr_info(" device=%s, hwaddr=%*phC, ipaddr=%pI4, mask=%pI4, gw=%pI4\n",
1509 ic_dev->name, ic_dev->addr_len, ic_dev->dev_addr,
1510 &ic_myaddr, &ic_netmask, &ic_gateway);
1511 pr_info(" host=%s, domain=%s, nis-domain=%s\n",
1512 utsname()->nodename, ic_domain, utsname()->domainname);
1513 pr_info(" bootserver=%pI4, rootserver=%pI4, rootpath=%s",
1514 &ic_servaddr, &root_server_addr, root_server_path);
1515 if (ic_dev_mtu)
1516 pr_cont(", mtu=%d", ic_dev_mtu);
1517 for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
1518 if (ic_nameservers[i] != NONE) {
1519 pr_info(" nameserver%u=%pI4",
1520 i, &ic_nameservers[i]);
1521 break;
1522 }
1523 for (i++; i < CONF_NAMESERVERS_MAX; i++)
1524 if (ic_nameservers[i] != NONE)
1525 pr_cont(", nameserver%u=%pI4\n", i, &ic_nameservers[i]);
1526 #endif /* !SILENT */
1527
1528 return 0;
1529 }
1530
1531 late_initcall(ip_auto_config);
1532
1533
1534 /*
1535 * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
1536 * command line parameter. See Documentation/filesystems/nfs/nfsroot.txt.
1537 */
1538 static int __init ic_proto_name(char *name)
1539 {
1540 if (!strcmp(name, "on") || !strcmp(name, "any")) {
1541 return 1;
1542 }
1543 if (!strcmp(name, "off") || !strcmp(name, "none")) {
1544 return 0;
1545 }
1546 #ifdef CONFIG_IP_PNP_DHCP
1547 else if (!strcmp(name, "dhcp")) {
1548 ic_proto_enabled &= ~IC_RARP;
1549 return 1;
1550 }
1551 #endif
1552 #ifdef CONFIG_IP_PNP_BOOTP
1553 else if (!strcmp(name, "bootp")) {
1554 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP);
1555 return 1;
1556 }
1557 #endif
1558 #ifdef CONFIG_IP_PNP_RARP
1559 else if (!strcmp(name, "rarp")) {
1560 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP);
1561 return 1;
1562 }
1563 #endif
1564 #ifdef IPCONFIG_DYNAMIC
1565 else if (!strcmp(name, "both")) {
1566 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */
1567 return 1;
1568 }
1569 #endif
1570 return 0;
1571 }
1572
1573 static int __init ip_auto_config_setup(char *addrs)
1574 {
1575 char *cp, *ip, *dp;
1576 int num = 0;
1577
1578 ic_set_manually = 1;
1579 ic_enable = 1;
1580
1581 /*
1582 * If any dhcp, bootp etc options are set, leave autoconfig on
1583 * and skip the below static IP processing.
1584 */
1585 if (ic_proto_name(addrs))
1586 return 1;
1587
1588 /* If no static IP is given, turn off autoconfig and bail. */
1589 if (*addrs == 0 ||
1590 strcmp(addrs, "off") == 0 ||
1591 strcmp(addrs, "none") == 0) {
1592 ic_enable = 0;
1593 return 1;
1594 }
1595
1596 ic_nameservers_predef();
1597
1598 /* Parse string for static IP assignment. */
1599 ip = addrs;
1600 while (ip && *ip) {
1601 if ((cp = strchr(ip, ':')))
1602 *cp++ = '\0';
1603 if (strlen(ip) > 0) {
1604 DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip));
1605 switch (num) {
1606 case 0:
1607 if ((ic_myaddr = in_aton(ip)) == ANY)
1608 ic_myaddr = NONE;
1609 break;
1610 case 1:
1611 if ((ic_servaddr = in_aton(ip)) == ANY)
1612 ic_servaddr = NONE;
1613 break;
1614 case 2:
1615 if ((ic_gateway = in_aton(ip)) == ANY)
1616 ic_gateway = NONE;
1617 break;
1618 case 3:
1619 if ((ic_netmask = in_aton(ip)) == ANY)
1620 ic_netmask = NONE;
1621 break;
1622 case 4:
1623 if ((dp = strchr(ip, '.'))) {
1624 *dp++ = '\0';
1625 strlcpy(utsname()->domainname, dp,
1626 sizeof(utsname()->domainname));
1627 }
1628 strlcpy(utsname()->nodename, ip,
1629 sizeof(utsname()->nodename));
1630 ic_host_name_set = 1;
1631 break;
1632 case 5:
1633 strlcpy(user_dev_name, ip, sizeof(user_dev_name));
1634 break;
1635 case 6:
1636 if (ic_proto_name(ip) == 0 &&
1637 ic_myaddr == NONE) {
1638 ic_enable = 0;
1639 }
1640 break;
1641 case 7:
1642 if (CONF_NAMESERVERS_MAX >= 1) {
1643 ic_nameservers[0] = in_aton(ip);
1644 if (ic_nameservers[0] == ANY)
1645 ic_nameservers[0] = NONE;
1646 }
1647 break;
1648 case 8:
1649 if (CONF_NAMESERVERS_MAX >= 2) {
1650 ic_nameservers[1] = in_aton(ip);
1651 if (ic_nameservers[1] == ANY)
1652 ic_nameservers[1] = NONE;
1653 }
1654 break;
1655 }
1656 }
1657 ip = cp;
1658 num++;
1659 }
1660
1661 return 1;
1662 }
1663 __setup("ip=", ip_auto_config_setup);
1664
1665 static int __init nfsaddrs_config_setup(char *addrs)
1666 {
1667 return ip_auto_config_setup(addrs);
1668 }
1669 __setup("nfsaddrs=", nfsaddrs_config_setup);
1670
1671 static int __init vendor_class_identifier_setup(char *addrs)
1672 {
1673 if (strlcpy(vendor_class_identifier, addrs,
1674 sizeof(vendor_class_identifier))
1675 >= sizeof(vendor_class_identifier))
1676 pr_warn("DHCP: vendorclass too long, truncated to \"%s\"",
1677 vendor_class_identifier);
1678 return 1;
1679 }
1680 __setup("dhcpclass=", vendor_class_identifier_setup);
CRIS linux kernel tree