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Merge tag 'mac80211-for-davem-2015-01-06' of git://git.kernel.org/pub/scm/linux/kerne...
[deliverable/linux.git] / net / ipv4 / ipconfig.c
1 /*
2 * Automatic Configuration of IP -- use DHCP, BOOTP, RARP, or
3 * user-supplied information to configure own IP address and routes.
4 *
5 * Copyright (C) 1996-1998 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
6 *
7 * Derived from network configuration code in fs/nfs/nfsroot.c,
8 * originally Copyright (C) 1995, 1996 Gero Kuhlmann and me.
9 *
10 * BOOTP rewritten to construct and analyse packets itself instead
11 * of misusing the IP layer. num_bugs_causing_wrong_arp_replies--;
12 * -- MJ, December 1998
13 *
14 * Fixed ip_auto_config_setup calling at startup in the new "Linker Magic"
15 * initialization scheme.
16 * - Arnaldo Carvalho de Melo <acme@conectiva.com.br>, 08/11/1999
17 *
18 * DHCP support added. To users this looks like a whole separate
19 * protocol, but we know it's just a bag on the side of BOOTP.
20 * -- Chip Salzenberg <chip@valinux.com>, May 2000
21 *
22 * Ported DHCP support from 2.2.16 to 2.4.0-test4
23 * -- Eric Biederman <ebiederman@lnxi.com>, 30 Aug 2000
24 *
25 * Merged changes from 2.2.19 into 2.4.3
26 * -- Eric Biederman <ebiederman@lnxi.com>, 22 April Aug 2001
27 *
28 * Multiple Nameservers in /proc/net/pnp
29 * -- Josef Siemes <jsiemes@web.de>, Aug 2002
30 */
31
32 #include <linux/types.h>
33 #include <linux/string.h>
34 #include <linux/kernel.h>
35 #include <linux/jiffies.h>
36 #include <linux/random.h>
37 #include <linux/init.h>
38 #include <linux/utsname.h>
39 #include <linux/in.h>
40 #include <linux/if.h>
41 #include <linux/inet.h>
42 #include <linux/inetdevice.h>
43 #include <linux/netdevice.h>
44 #include <linux/if_arp.h>
45 #include <linux/skbuff.h>
46 #include <linux/ip.h>
47 #include <linux/socket.h>
48 #include <linux/route.h>
49 #include <linux/udp.h>
50 #include <linux/proc_fs.h>
51 #include <linux/seq_file.h>
52 #include <linux/major.h>
53 #include <linux/root_dev.h>
54 #include <linux/delay.h>
55 #include <linux/nfs_fs.h>
56 #include <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; /* 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; /* 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 /* 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;
164
165 /* MTU for boot device */
166 static int ic_dev_mtu __initdata;
167
168 #ifdef IPCONFIG_DYNAMIC
169 static DEFINE_SPINLOCK(ic_recv_lock);
170 static volatile int ic_got_reply __initdata; /* Proto(s) that replied */
171 #endif
172 #ifdef IPCONFIG_DHCP
173 static int ic_dhcp_msgtype __initdata; /* 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; /* List of open device */
190 static struct net_device *ic_dev __initdata; /* 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, next_msg;
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 pr_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 pr_warn("DHCP/BOOTP: Ignoring device %s, MTU %d too small",
227 dev->name, dev->mtu);
228 if (!(dev->flags & IFF_NOARP))
229 able |= IC_RARP;
230 able &= ic_proto_enabled;
231 if (ic_proto_enabled && !able)
232 continue;
233 oflags = dev->flags;
234 if (dev_change_flags(dev, oflags | IFF_UP) < 0) {
235 pr_err("IP-Config: Failed to open %s\n",
236 dev->name);
237 continue;
238 }
239 if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) {
240 rtnl_unlock();
241 return -ENOMEM;
242 }
243 d->dev = dev;
244 *last = d;
245 last = &d->next;
246 d->flags = oflags;
247 d->able = able;
248 if (able & IC_BOOTP)
249 get_random_bytes(&d->xid, sizeof(__be32));
250 else
251 d->xid = 0;
252 ic_proto_have_if |= able;
253 DBG(("IP-Config: %s UP (able=%d, xid=%08x)\n",
254 dev->name, able, d->xid));
255 }
256 }
257
258 /* no point in waiting if we could not bring up at least one device */
259 if (!ic_first_dev)
260 goto have_carrier;
261
262 /* wait for a carrier on at least one device */
263 start = jiffies;
264 next_msg = start + msecs_to_jiffies(CONF_CARRIER_TIMEOUT/12);
265 while (time_before(jiffies, start +
266 msecs_to_jiffies(CONF_CARRIER_TIMEOUT))) {
267 int wait, elapsed;
268
269 for_each_netdev(&init_net, dev)
270 if (ic_is_init_dev(dev) && netif_carrier_ok(dev))
271 goto have_carrier;
272
273 msleep(1);
274
275 if (time_before(jiffies, next_msg))
276 continue;
277
278 elapsed = jiffies_to_msecs(jiffies - start);
279 wait = (CONF_CARRIER_TIMEOUT - elapsed + 500)/1000;
280 pr_info("Waiting up to %d more seconds for network.\n", wait);
281 next_msg = jiffies + msecs_to_jiffies(CONF_CARRIER_TIMEOUT/12);
282 }
283 have_carrier:
284 rtnl_unlock();
285
286 *last = NULL;
287
288 if (!ic_first_dev) {
289 if (user_dev_name[0])
290 pr_err("IP-Config: Device `%s' not found\n",
291 user_dev_name);
292 else
293 pr_err("IP-Config: No network devices available\n");
294 return -ENODEV;
295 }
296 return 0;
297 }
298
299 static void __init ic_close_devs(void)
300 {
301 struct ic_device *d, *next;
302 struct net_device *dev;
303
304 rtnl_lock();
305 next = ic_first_dev;
306 while ((d = next)) {
307 next = d->next;
308 dev = d->dev;
309 if (dev != ic_dev) {
310 DBG(("IP-Config: Downing %s\n", dev->name));
311 dev_change_flags(dev, d->flags);
312 }
313 kfree(d);
314 }
315 rtnl_unlock();
316 }
317
318 /*
319 * Interface to various network functions.
320 */
321
322 static inline void
323 set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port)
324 {
325 sin->sin_family = AF_INET;
326 sin->sin_addr.s_addr = addr;
327 sin->sin_port = port;
328 }
329
330 static int __init ic_devinet_ioctl(unsigned int cmd, struct ifreq *arg)
331 {
332 int res;
333
334 mm_segment_t oldfs = get_fs();
335 set_fs(get_ds());
336 res = devinet_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
337 set_fs(oldfs);
338 return res;
339 }
340
341 static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg)
342 {
343 int res;
344
345 mm_segment_t oldfs = get_fs();
346 set_fs(get_ds());
347 res = dev_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
348 set_fs(oldfs);
349 return res;
350 }
351
352 static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg)
353 {
354 int res;
355
356 mm_segment_t oldfs = get_fs();
357 set_fs(get_ds());
358 res = ip_rt_ioctl(&init_net, cmd, (void __user *) arg);
359 set_fs(oldfs);
360 return res;
361 }
362
363 /*
364 * Set up interface addresses and routes.
365 */
366
367 static int __init ic_setup_if(void)
368 {
369 struct ifreq ir;
370 struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr;
371 int err;
372
373 memset(&ir, 0, sizeof(ir));
374 strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name);
375 set_sockaddr(sin, ic_myaddr, 0);
376 if ((err = ic_devinet_ioctl(SIOCSIFADDR, &ir)) < 0) {
377 pr_err("IP-Config: Unable to set interface address (%d)\n",
378 err);
379 return -1;
380 }
381 set_sockaddr(sin, ic_netmask, 0);
382 if ((err = ic_devinet_ioctl(SIOCSIFNETMASK, &ir)) < 0) {
383 pr_err("IP-Config: Unable to set interface netmask (%d)\n",
384 err);
385 return -1;
386 }
387 set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0);
388 if ((err = ic_devinet_ioctl(SIOCSIFBRDADDR, &ir)) < 0) {
389 pr_err("IP-Config: Unable to set interface broadcast address (%d)\n",
390 err);
391 return -1;
392 }
393 /* Handle the case where we need non-standard MTU on the boot link (a network
394 * using jumbo frames, for instance). If we can't set the mtu, don't error
395 * out, we'll try to muddle along.
396 */
397 if (ic_dev_mtu != 0) {
398 strcpy(ir.ifr_name, ic_dev->name);
399 ir.ifr_mtu = ic_dev_mtu;
400 if ((err = ic_dev_ioctl(SIOCSIFMTU, &ir)) < 0)
401 pr_err("IP-Config: Unable to set interface mtu to %d (%d)\n",
402 ic_dev_mtu, err);
403 }
404 return 0;
405 }
406
407 static int __init ic_setup_routes(void)
408 {
409 /* No need to setup device routes, only the default route... */
410
411 if (ic_gateway != NONE) {
412 struct rtentry rm;
413 int err;
414
415 memset(&rm, 0, sizeof(rm));
416 if ((ic_gateway ^ ic_myaddr) & ic_netmask) {
417 pr_err("IP-Config: Gateway not on directly connected network\n");
418 return -1;
419 }
420 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0);
421 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0);
422 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0);
423 rm.rt_flags = RTF_UP | RTF_GATEWAY;
424 if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) {
425 pr_err("IP-Config: Cannot add default route (%d)\n",
426 err);
427 return -1;
428 }
429 }
430
431 return 0;
432 }
433
434 /*
435 * Fill in default values for all missing parameters.
436 */
437
438 static int __init ic_defaults(void)
439 {
440 /*
441 * At this point we have no userspace running so need not
442 * claim locks on system_utsname
443 */
444
445 if (!ic_host_name_set)
446 sprintf(init_utsname()->nodename, "%pI4", &ic_myaddr);
447
448 if (root_server_addr == NONE)
449 root_server_addr = ic_servaddr;
450
451 if (ic_netmask == NONE) {
452 if (IN_CLASSA(ntohl(ic_myaddr)))
453 ic_netmask = htonl(IN_CLASSA_NET);
454 else if (IN_CLASSB(ntohl(ic_myaddr)))
455 ic_netmask = htonl(IN_CLASSB_NET);
456 else if (IN_CLASSC(ntohl(ic_myaddr)))
457 ic_netmask = htonl(IN_CLASSC_NET);
458 else {
459 pr_err("IP-Config: Unable to guess netmask for address %pI4\n",
460 &ic_myaddr);
461 return -1;
462 }
463 printk("IP-Config: Guessing netmask %pI4\n", &ic_netmask);
464 }
465
466 return 0;
467 }
468
469 /*
470 * RARP support.
471 */
472
473 #ifdef IPCONFIG_RARP
474
475 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
476
477 static struct packet_type rarp_packet_type __initdata = {
478 .type = cpu_to_be16(ETH_P_RARP),
479 .func = ic_rarp_recv,
480 };
481
482 static inline void __init ic_rarp_init(void)
483 {
484 dev_add_pack(&rarp_packet_type);
485 }
486
487 static inline void __init ic_rarp_cleanup(void)
488 {
489 dev_remove_pack(&rarp_packet_type);
490 }
491
492 /*
493 * Process received RARP packet.
494 */
495 static int __init
496 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
497 {
498 struct arphdr *rarp;
499 unsigned char *rarp_ptr;
500 __be32 sip, tip;
501 unsigned char *tha; /* t for "target" */
502 struct ic_device *d;
503
504 if (!net_eq(dev_net(dev), &init_net))
505 goto drop;
506
507 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
508 return NET_RX_DROP;
509
510 if (!pskb_may_pull(skb, sizeof(struct arphdr)))
511 goto drop;
512
513 /* Basic sanity checks can be done without the lock. */
514 rarp = (struct arphdr *)skb_transport_header(skb);
515
516 /* If this test doesn't pass, it's not IP, or we should
517 * ignore it anyway.
518 */
519 if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd))
520 goto drop;
521
522 /* If it's not a RARP reply, delete it. */
523 if (rarp->ar_op != htons(ARPOP_RREPLY))
524 goto drop;
525
526 /* If it's not Ethernet, delete it. */
527 if (rarp->ar_pro != htons(ETH_P_IP))
528 goto drop;
529
530 if (!pskb_may_pull(skb, arp_hdr_len(dev)))
531 goto drop;
532
533 /* OK, it is all there and looks valid, process... */
534 rarp = (struct arphdr *)skb_transport_header(skb);
535 rarp_ptr = (unsigned char *) (rarp + 1);
536
537 /* One reply at a time, please. */
538 spin_lock(&ic_recv_lock);
539
540 /* If we already have a reply, just drop the packet */
541 if (ic_got_reply)
542 goto drop_unlock;
543
544 /* Find the ic_device that the packet arrived on */
545 d = ic_first_dev;
546 while (d && d->dev != dev)
547 d = d->next;
548 if (!d)
549 goto drop_unlock; /* should never happen */
550
551 /* Extract variable-width fields */
552 rarp_ptr += dev->addr_len;
553 memcpy(&sip, rarp_ptr, 4);
554 rarp_ptr += 4;
555 tha = rarp_ptr;
556 rarp_ptr += dev->addr_len;
557 memcpy(&tip, rarp_ptr, 4);
558
559 /* Discard packets which are not meant for us. */
560 if (memcmp(tha, dev->dev_addr, dev->addr_len))
561 goto drop_unlock;
562
563 /* Discard packets which are not from specified server. */
564 if (ic_servaddr != NONE && ic_servaddr != sip)
565 goto drop_unlock;
566
567 /* We have a winner! */
568 ic_dev = dev;
569 if (ic_myaddr == NONE)
570 ic_myaddr = tip;
571 ic_servaddr = sip;
572 ic_addrservaddr = sip;
573 ic_got_reply = IC_RARP;
574
575 drop_unlock:
576 /* Show's over. Nothing to see here. */
577 spin_unlock(&ic_recv_lock);
578
579 drop:
580 /* Throw the packet out. */
581 kfree_skb(skb);
582 return 0;
583 }
584
585
586 /*
587 * Send RARP request packet over a single interface.
588 */
589 static void __init ic_rarp_send_if(struct ic_device *d)
590 {
591 struct net_device *dev = d->dev;
592 arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL,
593 dev->dev_addr, dev->dev_addr);
594 }
595 #endif
596
597 /*
598 * Predefine Nameservers
599 */
600 static inline void __init ic_nameservers_predef(void)
601 {
602 int i;
603
604 for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
605 ic_nameservers[i] = NONE;
606 }
607
608 /*
609 * DHCP/BOOTP support.
610 */
611
612 #ifdef IPCONFIG_BOOTP
613
614 struct bootp_pkt { /* BOOTP packet format */
615 struct iphdr iph; /* IP header */
616 struct udphdr udph; /* UDP header */
617 u8 op; /* 1=request, 2=reply */
618 u8 htype; /* HW address type */
619 u8 hlen; /* HW address length */
620 u8 hops; /* Used only by gateways */
621 __be32 xid; /* Transaction ID */
622 __be16 secs; /* Seconds since we started */
623 __be16 flags; /* Just what it says */
624 __be32 client_ip; /* Client's IP address if known */
625 __be32 your_ip; /* Assigned IP address */
626 __be32 server_ip; /* (Next, e.g. NFS) Server's IP address */
627 __be32 relay_ip; /* IP address of BOOTP relay */
628 u8 hw_addr[16]; /* Client's HW address */
629 u8 serv_name[64]; /* Server host name */
630 u8 boot_file[128]; /* Name of boot file */
631 u8 exten[312]; /* DHCP options / BOOTP vendor extensions */
632 };
633
634 /* packet ops */
635 #define BOOTP_REQUEST 1
636 #define BOOTP_REPLY 2
637
638 /* DHCP message types */
639 #define DHCPDISCOVER 1
640 #define DHCPOFFER 2
641 #define DHCPREQUEST 3
642 #define DHCPDECLINE 4
643 #define DHCPACK 5
644 #define DHCPNAK 6
645 #define DHCPRELEASE 7
646 #define DHCPINFORM 8
647
648 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
649
650 static struct packet_type bootp_packet_type __initdata = {
651 .type = cpu_to_be16(ETH_P_IP),
652 .func = ic_bootp_recv,
653 };
654
655 static __be32 ic_dev_xid; /* Device under configuration */
656
657 /*
658 * Initialize DHCP/BOOTP extension fields in the request.
659 */
660
661 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 };
662
663 #ifdef IPCONFIG_DHCP
664
665 static void __init
666 ic_dhcp_init_options(u8 *options)
667 {
668 u8 mt = ((ic_servaddr == NONE)
669 ? DHCPDISCOVER : DHCPREQUEST);
670 u8 *e = options;
671 int len;
672
673 #ifdef IPCONFIG_DEBUG
674 printk("DHCP: Sending message type %d\n", mt);
675 #endif
676
677 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */
678 e += 4;
679
680 *e++ = 53; /* DHCP message type */
681 *e++ = 1;
682 *e++ = mt;
683
684 if (mt == DHCPREQUEST) {
685 *e++ = 54; /* Server ID (IP address) */
686 *e++ = 4;
687 memcpy(e, &ic_servaddr, 4);
688 e += 4;
689
690 *e++ = 50; /* Requested IP address */
691 *e++ = 4;
692 memcpy(e, &ic_myaddr, 4);
693 e += 4;
694 }
695
696 /* always? */
697 {
698 static const u8 ic_req_params[] = {
699 1, /* Subnet mask */
700 3, /* Default gateway */
701 6, /* DNS server */
702 12, /* Host name */
703 15, /* Domain name */
704 17, /* Boot path */
705 26, /* MTU */
706 40, /* NIS domain name */
707 };
708
709 *e++ = 55; /* Parameter request list */
710 *e++ = sizeof(ic_req_params);
711 memcpy(e, ic_req_params, sizeof(ic_req_params));
712 e += sizeof(ic_req_params);
713
714 if (ic_host_name_set) {
715 *e++ = 12; /* host-name */
716 len = strlen(utsname()->nodename);
717 *e++ = len;
718 memcpy(e, utsname()->nodename, len);
719 e += len;
720 }
721 if (*vendor_class_identifier) {
722 pr_info("DHCP: sending class identifier \"%s\"\n",
723 vendor_class_identifier);
724 *e++ = 60; /* Class-identifier */
725 len = strlen(vendor_class_identifier);
726 *e++ = len;
727 memcpy(e, vendor_class_identifier, len);
728 e += len;
729 }
730 }
731
732 *e++ = 255; /* End of the list */
733 }
734
735 #endif /* IPCONFIG_DHCP */
736
737 static void __init ic_bootp_init_ext(u8 *e)
738 {
739 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */
740 e += 4;
741 *e++ = 1; /* Subnet mask request */
742 *e++ = 4;
743 e += 4;
744 *e++ = 3; /* Default gateway request */
745 *e++ = 4;
746 e += 4;
747 *e++ = 5; /* Name server request */
748 *e++ = 8;
749 e += 8;
750 *e++ = 12; /* Host name request */
751 *e++ = 32;
752 e += 32;
753 *e++ = 40; /* NIS Domain name request */
754 *e++ = 32;
755 e += 32;
756 *e++ = 17; /* Boot path */
757 *e++ = 40;
758 e += 40;
759
760 *e++ = 57; /* set extension buffer size for reply */
761 *e++ = 2;
762 *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */
763 *e++ = 150;
764
765 *e++ = 255; /* End of the list */
766 }
767
768
769 /*
770 * Initialize the DHCP/BOOTP mechanism.
771 */
772 static inline void __init ic_bootp_init(void)
773 {
774 ic_nameservers_predef();
775
776 dev_add_pack(&bootp_packet_type);
777 }
778
779
780 /*
781 * DHCP/BOOTP cleanup.
782 */
783 static inline void __init ic_bootp_cleanup(void)
784 {
785 dev_remove_pack(&bootp_packet_type);
786 }
787
788
789 /*
790 * Send DHCP/BOOTP request to single interface.
791 */
792 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff)
793 {
794 struct net_device *dev = d->dev;
795 struct sk_buff *skb;
796 struct bootp_pkt *b;
797 struct iphdr *h;
798 int hlen = LL_RESERVED_SPACE(dev);
799 int tlen = dev->needed_tailroom;
800
801 /* Allocate packet */
802 skb = alloc_skb(sizeof(struct bootp_pkt) + hlen + tlen + 15,
803 GFP_KERNEL);
804 if (!skb)
805 return;
806 skb_reserve(skb, hlen);
807 b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt));
808 memset(b, 0, sizeof(struct bootp_pkt));
809
810 /* Construct IP header */
811 skb_reset_network_header(skb);
812 h = ip_hdr(skb);
813 h->version = 4;
814 h->ihl = 5;
815 h->tot_len = htons(sizeof(struct bootp_pkt));
816 h->frag_off = htons(IP_DF);
817 h->ttl = 64;
818 h->protocol = IPPROTO_UDP;
819 h->daddr = htonl(INADDR_BROADCAST);
820 h->check = ip_fast_csum((unsigned char *) h, h->ihl);
821
822 /* Construct UDP header */
823 b->udph.source = htons(68);
824 b->udph.dest = htons(67);
825 b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr));
826 /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */
827
828 /* Construct DHCP/BOOTP header */
829 b->op = BOOTP_REQUEST;
830 if (dev->type < 256) /* check for false types */
831 b->htype = dev->type;
832 else if (dev->type == ARPHRD_FDDI)
833 b->htype = ARPHRD_ETHER;
834 else {
835 printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name);
836 b->htype = dev->type; /* can cause undefined behavior */
837 }
838
839 /* server_ip and your_ip address are both already zero per RFC2131 */
840 b->hlen = dev->addr_len;
841 memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
842 b->secs = htons(jiffies_diff / HZ);
843 b->xid = d->xid;
844
845 /* add DHCP options or BOOTP extensions */
846 #ifdef IPCONFIG_DHCP
847 if (ic_proto_enabled & IC_USE_DHCP)
848 ic_dhcp_init_options(b->exten);
849 else
850 #endif
851 ic_bootp_init_ext(b->exten);
852
853 /* Chain packet down the line... */
854 skb->dev = dev;
855 skb->protocol = htons(ETH_P_IP);
856 if (dev_hard_header(skb, dev, ntohs(skb->protocol),
857 dev->broadcast, dev->dev_addr, skb->len) < 0) {
858 kfree_skb(skb);
859 printk("E");
860 return;
861 }
862
863 if (dev_queue_xmit(skb) < 0)
864 printk("E");
865 }
866
867
868 /*
869 * Copy BOOTP-supplied string if not already set.
870 */
871 static int __init ic_bootp_string(char *dest, char *src, int len, int max)
872 {
873 if (!len)
874 return 0;
875 if (len > max-1)
876 len = max-1;
877 memcpy(dest, src, len);
878 dest[len] = '\0';
879 return 1;
880 }
881
882
883 /*
884 * Process BOOTP extensions.
885 */
886 static void __init ic_do_bootp_ext(u8 *ext)
887 {
888 u8 servers;
889 int i;
890 __be16 mtu;
891
892 #ifdef IPCONFIG_DEBUG
893 u8 *c;
894
895 printk("DHCP/BOOTP: Got extension %d:",*ext);
896 for (c=ext+2; c<ext+2+ext[1]; c++)
897 printk(" %02x", *c);
898 printk("\n");
899 #endif
900
901 switch (*ext++) {
902 case 1: /* Subnet mask */
903 if (ic_netmask == NONE)
904 memcpy(&ic_netmask, ext+1, 4);
905 break;
906 case 3: /* Default gateway */
907 if (ic_gateway == NONE)
908 memcpy(&ic_gateway, ext+1, 4);
909 break;
910 case 6: /* DNS server */
911 servers= *ext/4;
912 if (servers > CONF_NAMESERVERS_MAX)
913 servers = CONF_NAMESERVERS_MAX;
914 for (i = 0; i < servers; i++) {
915 if (ic_nameservers[i] == NONE)
916 memcpy(&ic_nameservers[i], ext+1+4*i, 4);
917 }
918 break;
919 case 12: /* Host name */
920 ic_bootp_string(utsname()->nodename, ext+1, *ext,
921 __NEW_UTS_LEN);
922 ic_host_name_set = 1;
923 break;
924 case 15: /* Domain name (DNS) */
925 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
926 break;
927 case 17: /* Root path */
928 if (!root_server_path[0])
929 ic_bootp_string(root_server_path, ext+1, *ext,
930 sizeof(root_server_path));
931 break;
932 case 26: /* Interface MTU */
933 memcpy(&mtu, ext+1, sizeof(mtu));
934 ic_dev_mtu = ntohs(mtu);
935 break;
936 case 40: /* NIS Domain name (_not_ DNS) */
937 ic_bootp_string(utsname()->domainname, ext+1, *ext,
938 __NEW_UTS_LEN);
939 break;
940 }
941 }
942
943
944 /*
945 * Receive BOOTP reply.
946 */
947 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
948 {
949 struct bootp_pkt *b;
950 struct iphdr *h;
951 struct ic_device *d;
952 int len, ext_len;
953
954 if (!net_eq(dev_net(dev), &init_net))
955 goto drop;
956
957 /* Perform verifications before taking the lock. */
958 if (skb->pkt_type == PACKET_OTHERHOST)
959 goto drop;
960
961 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
962 return NET_RX_DROP;
963
964 if (!pskb_may_pull(skb,
965 sizeof(struct iphdr) +
966 sizeof(struct udphdr)))
967 goto drop;
968
969 b = (struct bootp_pkt *)skb_network_header(skb);
970 h = &b->iph;
971
972 if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP)
973 goto drop;
974
975 /* Fragments are not supported */
976 if (ip_is_fragment(h)) {
977 net_err_ratelimited("DHCP/BOOTP: Ignoring fragmented reply\n");
978 goto drop;
979 }
980
981 if (skb->len < ntohs(h->tot_len))
982 goto drop;
983
984 if (ip_fast_csum((char *) h, h->ihl))
985 goto drop;
986
987 if (b->udph.source != htons(67) || b->udph.dest != htons(68))
988 goto drop;
989
990 if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
991 goto drop;
992
993 len = ntohs(b->udph.len) - sizeof(struct udphdr);
994 ext_len = len - (sizeof(*b) -
995 sizeof(struct iphdr) -
996 sizeof(struct udphdr) -
997 sizeof(b->exten));
998 if (ext_len < 0)
999 goto drop;
1000
1001 /* Ok the front looks good, make sure we can get at the rest. */
1002 if (!pskb_may_pull(skb, skb->len))
1003 goto drop;
1004
1005 b = (struct bootp_pkt *)skb_network_header(skb);
1006 h = &b->iph;
1007
1008 /* One reply at a time, please. */
1009 spin_lock(&ic_recv_lock);
1010
1011 /* If we already have a reply, just drop the packet */
1012 if (ic_got_reply)
1013 goto drop_unlock;
1014
1015 /* Find the ic_device that the packet arrived on */
1016 d = ic_first_dev;
1017 while (d && d->dev != dev)
1018 d = d->next;
1019 if (!d)
1020 goto drop_unlock; /* should never happen */
1021
1022 /* Is it a reply to our BOOTP request? */
1023 if (b->op != BOOTP_REPLY ||
1024 b->xid != d->xid) {
1025 net_err_ratelimited("DHCP/BOOTP: Reply not for us, op[%x] xid[%x]\n",
1026 b->op, b->xid);
1027 goto drop_unlock;
1028 }
1029
1030 /* Is it a reply for the device we are configuring? */
1031 if (b->xid != ic_dev_xid) {
1032 net_err_ratelimited("DHCP/BOOTP: Ignoring delayed packet\n");
1033 goto drop_unlock;
1034 }
1035
1036 /* Parse extensions */
1037 if (ext_len >= 4 &&
1038 !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */
1039 u8 *end = (u8 *) b + ntohs(b->iph.tot_len);
1040 u8 *ext;
1041
1042 #ifdef IPCONFIG_DHCP
1043 if (ic_proto_enabled & IC_USE_DHCP) {
1044 __be32 server_id = NONE;
1045 int mt = 0;
1046
1047 ext = &b->exten[4];
1048 while (ext < end && *ext != 0xff) {
1049 u8 *opt = ext++;
1050 if (*opt == 0) /* Padding */
1051 continue;
1052 ext += *ext + 1;
1053 if (ext >= end)
1054 break;
1055 switch (*opt) {
1056 case 53: /* Message type */
1057 if (opt[1])
1058 mt = opt[2];
1059 break;
1060 case 54: /* Server ID (IP address) */
1061 if (opt[1] >= 4)
1062 memcpy(&server_id, opt + 2, 4);
1063 break;
1064 }
1065 }
1066
1067 #ifdef IPCONFIG_DEBUG
1068 printk("DHCP: Got message type %d\n", mt);
1069 #endif
1070
1071 switch (mt) {
1072 case DHCPOFFER:
1073 /* While in the process of accepting one offer,
1074 * ignore all others.
1075 */
1076 if (ic_myaddr != NONE)
1077 goto drop_unlock;
1078
1079 /* Let's accept that offer. */
1080 ic_myaddr = b->your_ip;
1081 ic_servaddr = server_id;
1082 #ifdef IPCONFIG_DEBUG
1083 printk("DHCP: Offered address %pI4 by server %pI4\n",
1084 &ic_myaddr, &b->iph.saddr);
1085 #endif
1086 /* The DHCP indicated server address takes
1087 * precedence over the bootp header one if
1088 * they are different.
1089 */
1090 if ((server_id != NONE) &&
1091 (b->server_ip != server_id))
1092 b->server_ip = ic_servaddr;
1093 break;
1094
1095 case DHCPACK:
1096 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0)
1097 goto drop_unlock;
1098
1099 /* Yeah! */
1100 break;
1101
1102 default:
1103 /* Urque. Forget it*/
1104 ic_myaddr = NONE;
1105 ic_servaddr = NONE;
1106 goto drop_unlock;
1107 }
1108
1109 ic_dhcp_msgtype = mt;
1110
1111 }
1112 #endif /* IPCONFIG_DHCP */
1113
1114 ext = &b->exten[4];
1115 while (ext < end && *ext != 0xff) {
1116 u8 *opt = ext++;
1117 if (*opt == 0) /* Padding */
1118 continue;
1119 ext += *ext + 1;
1120 if (ext < end)
1121 ic_do_bootp_ext(opt);
1122 }
1123 }
1124
1125 /* We have a winner! */
1126 ic_dev = dev;
1127 ic_myaddr = b->your_ip;
1128 ic_servaddr = b->server_ip;
1129 ic_addrservaddr = b->iph.saddr;
1130 if (ic_gateway == NONE && b->relay_ip)
1131 ic_gateway = b->relay_ip;
1132 if (ic_nameservers[0] == NONE)
1133 ic_nameservers[0] = ic_servaddr;
1134 ic_got_reply = IC_BOOTP;
1135
1136 drop_unlock:
1137 /* Show's over. Nothing to see here. */
1138 spin_unlock(&ic_recv_lock);
1139
1140 drop:
1141 /* Throw the packet out. */
1142 kfree_skb(skb);
1143
1144 return 0;
1145 }
1146
1147
1148 #endif
1149
1150
1151 /*
1152 * Dynamic IP configuration -- DHCP, BOOTP, RARP.
1153 */
1154
1155 #ifdef IPCONFIG_DYNAMIC
1156
1157 static int __init ic_dynamic(void)
1158 {
1159 int retries;
1160 struct ic_device *d;
1161 unsigned long start_jiffies, timeout, jiff;
1162 int do_bootp = ic_proto_have_if & IC_BOOTP;
1163 int do_rarp = ic_proto_have_if & IC_RARP;
1164
1165 /*
1166 * If none of DHCP/BOOTP/RARP was selected, return with an error.
1167 * This routine gets only called when some pieces of information
1168 * are missing, and without DHCP/BOOTP/RARP we are unable to get it.
1169 */
1170 if (!ic_proto_enabled) {
1171 pr_err("IP-Config: Incomplete network configuration information\n");
1172 return -1;
1173 }
1174
1175 #ifdef IPCONFIG_BOOTP
1176 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
1177 pr_err("DHCP/BOOTP: No suitable device found\n");
1178 #endif
1179 #ifdef IPCONFIG_RARP
1180 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)
1181 pr_err("RARP: No suitable device found\n");
1182 #endif
1183
1184 if (!ic_proto_have_if)
1185 /* Error message already printed */
1186 return -1;
1187
1188 /*
1189 * Setup protocols
1190 */
1191 #ifdef IPCONFIG_BOOTP
1192 if (do_bootp)
1193 ic_bootp_init();
1194 #endif
1195 #ifdef IPCONFIG_RARP
1196 if (do_rarp)
1197 ic_rarp_init();
1198 #endif
1199
1200 /*
1201 * Send requests and wait, until we get an answer. This loop
1202 * seems to be a terrible waste of CPU time, but actually there is
1203 * only one process running at all, so we don't need to use any
1204 * scheduler functions.
1205 * [Actually we could now, but the nothing else running note still
1206 * applies.. - AC]
1207 */
1208 pr_notice("Sending %s%s%s requests .",
1209 do_bootp
1210 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "",
1211 (do_bootp && do_rarp) ? " and " : "",
1212 do_rarp ? "RARP" : "");
1213
1214 start_jiffies = jiffies;
1215 d = ic_first_dev;
1216 retries = CONF_SEND_RETRIES;
1217 get_random_bytes(&timeout, sizeof(timeout));
1218 timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned int) CONF_TIMEOUT_RANDOM);
1219 for (;;) {
1220 #ifdef IPCONFIG_BOOTP
1221 /* Track the device we are configuring */
1222 ic_dev_xid = d->xid;
1223
1224 if (do_bootp && (d->able & IC_BOOTP))
1225 ic_bootp_send_if(d, jiffies - start_jiffies);
1226 #endif
1227 #ifdef IPCONFIG_RARP
1228 if (do_rarp && (d->able & IC_RARP))
1229 ic_rarp_send_if(d);
1230 #endif
1231
1232 jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout);
1233 while (time_before(jiffies, jiff) && !ic_got_reply)
1234 schedule_timeout_uninterruptible(1);
1235 #ifdef IPCONFIG_DHCP
1236 /* DHCP isn't done until we get a DHCPACK. */
1237 if ((ic_got_reply & IC_BOOTP) &&
1238 (ic_proto_enabled & IC_USE_DHCP) &&
1239 ic_dhcp_msgtype != DHCPACK) {
1240 ic_got_reply = 0;
1241 pr_cont(",");
1242 continue;
1243 }
1244 #endif /* IPCONFIG_DHCP */
1245
1246 if (ic_got_reply) {
1247 pr_cont(" OK\n");
1248 break;
1249 }
1250
1251 if ((d = d->next))
1252 continue;
1253
1254 if (! --retries) {
1255 pr_cont(" timed out!\n");
1256 break;
1257 }
1258
1259 d = ic_first_dev;
1260
1261 timeout = timeout CONF_TIMEOUT_MULT;
1262 if (timeout > CONF_TIMEOUT_MAX)
1263 timeout = CONF_TIMEOUT_MAX;
1264
1265 pr_cont(".");
1266 }
1267
1268 #ifdef IPCONFIG_BOOTP
1269 if (do_bootp)
1270 ic_bootp_cleanup();
1271 #endif
1272 #ifdef IPCONFIG_RARP
1273 if (do_rarp)
1274 ic_rarp_cleanup();
1275 #endif
1276
1277 if (!ic_got_reply) {
1278 ic_myaddr = NONE;
1279 return -1;
1280 }
1281
1282 printk("IP-Config: Got %s answer from %pI4, ",
1283 ((ic_got_reply & IC_RARP) ? "RARP"
1284 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),
1285 &ic_addrservaddr);
1286 pr_cont("my address is %pI4\n", &ic_myaddr);
1287
1288 return 0;
1289 }
1290
1291 #endif /* IPCONFIG_DYNAMIC */
1292
1293 #ifdef CONFIG_PROC_FS
1294
1295 static int pnp_seq_show(struct seq_file *seq, void *v)
1296 {
1297 int i;
1298
1299 if (ic_proto_used & IC_PROTO)
1300 seq_printf(seq, "#PROTO: %s\n",
1301 (ic_proto_used & IC_RARP) ? "RARP"
1302 : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP");
1303 else
1304 seq_puts(seq, "#MANUAL\n");
1305
1306 if (ic_domain[0])
1307 seq_printf(seq,
1308 "domain %s\n", ic_domain);
1309 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {
1310 if (ic_nameservers[i] != NONE)
1311 seq_printf(seq, "nameserver %pI4\n",
1312 &ic_nameservers[i]);
1313 }
1314 if (ic_servaddr != NONE)
1315 seq_printf(seq, "bootserver %pI4\n",
1316 &ic_servaddr);
1317 return 0;
1318 }
1319
1320 static int pnp_seq_open(struct inode *indoe, struct file *file)
1321 {
1322 return single_open(file, pnp_seq_show, NULL);
1323 }
1324
1325 static const struct file_operations pnp_seq_fops = {
1326 .owner = THIS_MODULE,
1327 .open = pnp_seq_open,
1328 .read = seq_read,
1329 .llseek = seq_lseek,
1330 .release = single_release,
1331 };
1332 #endif /* CONFIG_PROC_FS */
1333
1334 /*
1335 * Extract IP address from the parameter string if needed. Note that we
1336 * need to have root_server_addr set _before_ IPConfig gets called as it
1337 * can override it.
1338 */
1339 __be32 __init root_nfs_parse_addr(char *name)
1340 {
1341 __be32 addr;
1342 int octets = 0;
1343 char *cp, *cq;
1344
1345 cp = cq = name;
1346 while (octets < 4) {
1347 while (*cp >= '0' && *cp <= '9')
1348 cp++;
1349 if (cp == cq || cp - cq > 3)
1350 break;
1351 if (*cp == '.' || octets == 3)
1352 octets++;
1353 if (octets < 4)
1354 cp++;
1355 cq = cp;
1356 }
1357 if (octets == 4 && (*cp == ':' || *cp == '\0')) {
1358 if (*cp == ':')
1359 *cp++ = '\0';
1360 addr = in_aton(name);
1361 memmove(name, cp, strlen(cp) + 1);
1362 } else
1363 addr = NONE;
1364
1365 return addr;
1366 }
1367
1368 #define DEVICE_WAIT_MAX 12 /* 12 seconds */
1369
1370 static int __init wait_for_devices(void)
1371 {
1372 int i;
1373
1374 for (i = 0; i < DEVICE_WAIT_MAX; i++) {
1375 struct net_device *dev;
1376 int found = 0;
1377
1378 rtnl_lock();
1379 for_each_netdev(&init_net, dev) {
1380 if (ic_is_init_dev(dev)) {
1381 found = 1;
1382 break;
1383 }
1384 }
1385 rtnl_unlock();
1386 if (found)
1387 return 0;
1388 ssleep(1);
1389 }
1390 return -ENODEV;
1391 }
1392
1393 /*
1394 * IP Autoconfig dispatcher.
1395 */
1396
1397 static int __init ip_auto_config(void)
1398 {
1399 __be32 addr;
1400 #ifdef IPCONFIG_DYNAMIC
1401 int retries = CONF_OPEN_RETRIES;
1402 #endif
1403 int err;
1404 unsigned int i;
1405
1406 #ifdef CONFIG_PROC_FS
1407 proc_create("pnp", S_IRUGO, init_net.proc_net, &pnp_seq_fops);
1408 #endif /* CONFIG_PROC_FS */
1409
1410 if (!ic_enable)
1411 return 0;
1412
1413 DBG(("IP-Config: Entered.\n"));
1414 #ifdef IPCONFIG_DYNAMIC
1415 try_try_again:
1416 #endif
1417 /* Wait for devices to appear */
1418 err = wait_for_devices();
1419 if (err)
1420 return err;
1421
1422 /* Setup all network devices */
1423 err = ic_open_devs();
1424 if (err)
1425 return err;
1426
1427 /* Give drivers a chance to settle */
1428 msleep(CONF_POST_OPEN);
1429
1430 /*
1431 * If the config information is insufficient (e.g., our IP address or
1432 * IP address of the boot server is missing or we have multiple network
1433 * interfaces and no default was set), use BOOTP or RARP to get the
1434 * missing values.
1435 */
1436 if (ic_myaddr == NONE ||
1437 #ifdef CONFIG_ROOT_NFS
1438 (root_server_addr == NONE &&
1439 ic_servaddr == NONE &&
1440 ROOT_DEV == Root_NFS) ||
1441 #endif
1442 ic_first_dev->next) {
1443 #ifdef IPCONFIG_DYNAMIC
1444 if (ic_dynamic() < 0) {
1445 ic_close_devs();
1446
1447 /*
1448 * I don't know why, but sometimes the
1449 * eepro100 driver (at least) gets upset and
1450 * doesn't work the first time it's opened.
1451 * But then if you close it and reopen it, it
1452 * works just fine. So we need to try that at
1453 * least once before giving up.
1454 *
1455 * Also, if the root will be NFS-mounted, we
1456 * have nowhere to go if DHCP fails. So we
1457 * just have to keep trying forever.
1458 *
1459 * -- Chip
1460 */
1461 #ifdef CONFIG_ROOT_NFS
1462 if (ROOT_DEV == Root_NFS) {
1463 pr_err("IP-Config: Retrying forever (NFS root)...\n");
1464 goto try_try_again;
1465 }
1466 #endif
1467
1468 if (--retries) {
1469 pr_err("IP-Config: Reopening network devices...\n");
1470 goto try_try_again;
1471 }
1472
1473 /* Oh, well. At least we tried. */
1474 pr_err("IP-Config: Auto-configuration of network failed\n");
1475 return -1;
1476 }
1477 #else /* !DYNAMIC */
1478 pr_err("IP-Config: Incomplete network configuration information\n");
1479 ic_close_devs();
1480 return -1;
1481 #endif /* IPCONFIG_DYNAMIC */
1482 } else {
1483 /* Device selected manually or only one device -> use it */
1484 ic_dev = ic_first_dev->dev;
1485 }
1486
1487 addr = root_nfs_parse_addr(root_server_path);
1488 if (root_server_addr == NONE)
1489 root_server_addr = addr;
1490
1491 /*
1492 * Use defaults wherever applicable.
1493 */
1494 if (ic_defaults() < 0)
1495 return -1;
1496
1497 /*
1498 * Close all network devices except the device we've
1499 * autoconfigured and set up routes.
1500 */
1501 ic_close_devs();
1502 if (ic_setup_if() < 0 || ic_setup_routes() < 0)
1503 return -1;
1504
1505 /*
1506 * Record which protocol was actually used.
1507 */
1508 #ifdef IPCONFIG_DYNAMIC
1509 ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP);
1510 #endif
1511
1512 #ifndef IPCONFIG_SILENT
1513 /*
1514 * Clue in the operator.
1515 */
1516 pr_info("IP-Config: Complete:\n");
1517
1518 pr_info(" device=%s, hwaddr=%*phC, ipaddr=%pI4, mask=%pI4, gw=%pI4\n",
1519 ic_dev->name, ic_dev->addr_len, ic_dev->dev_addr,
1520 &ic_myaddr, &ic_netmask, &ic_gateway);
1521 pr_info(" host=%s, domain=%s, nis-domain=%s\n",
1522 utsname()->nodename, ic_domain, utsname()->domainname);
1523 pr_info(" bootserver=%pI4, rootserver=%pI4, rootpath=%s",
1524 &ic_servaddr, &root_server_addr, root_server_path);
1525 if (ic_dev_mtu)
1526 pr_cont(", mtu=%d", ic_dev_mtu);
1527 for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
1528 if (ic_nameservers[i] != NONE) {
1529 pr_info(" nameserver%u=%pI4",
1530 i, &ic_nameservers[i]);
1531 break;
1532 }
1533 for (i++; i < CONF_NAMESERVERS_MAX; i++)
1534 if (ic_nameservers[i] != NONE)
1535 pr_cont(", nameserver%u=%pI4", i, &ic_nameservers[i]);
1536 pr_cont("\n");
1537 #endif /* !SILENT */
1538
1539 return 0;
1540 }
1541
1542 late_initcall(ip_auto_config);
1543
1544
1545 /*
1546 * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
1547 * command line parameter. See Documentation/filesystems/nfs/nfsroot.txt.
1548 */
1549 static int __init ic_proto_name(char *name)
1550 {
1551 if (!strcmp(name, "on") || !strcmp(name, "any")) {
1552 return 1;
1553 }
1554 if (!strcmp(name, "off") || !strcmp(name, "none")) {
1555 return 0;
1556 }
1557 #ifdef CONFIG_IP_PNP_DHCP
1558 else if (!strcmp(name, "dhcp")) {
1559 ic_proto_enabled &= ~IC_RARP;
1560 return 1;
1561 }
1562 #endif
1563 #ifdef CONFIG_IP_PNP_BOOTP
1564 else if (!strcmp(name, "bootp")) {
1565 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP);
1566 return 1;
1567 }
1568 #endif
1569 #ifdef CONFIG_IP_PNP_RARP
1570 else if (!strcmp(name, "rarp")) {
1571 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP);
1572 return 1;
1573 }
1574 #endif
1575 #ifdef IPCONFIG_DYNAMIC
1576 else if (!strcmp(name, "both")) {
1577 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */
1578 return 1;
1579 }
1580 #endif
1581 return 0;
1582 }
1583
1584 static int __init ip_auto_config_setup(char *addrs)
1585 {
1586 char *cp, *ip, *dp;
1587 int num = 0;
1588
1589 ic_set_manually = 1;
1590 ic_enable = 1;
1591
1592 /*
1593 * If any dhcp, bootp etc options are set, leave autoconfig on
1594 * and skip the below static IP processing.
1595 */
1596 if (ic_proto_name(addrs))
1597 return 1;
1598
1599 /* If no static IP is given, turn off autoconfig and bail. */
1600 if (*addrs == 0 ||
1601 strcmp(addrs, "off") == 0 ||
1602 strcmp(addrs, "none") == 0) {
1603 ic_enable = 0;
1604 return 1;
1605 }
1606
1607 ic_nameservers_predef();
1608
1609 /* Parse string for static IP assignment. */
1610 ip = addrs;
1611 while (ip && *ip) {
1612 if ((cp = strchr(ip, ':')))
1613 *cp++ = '\0';
1614 if (strlen(ip) > 0) {
1615 DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip));
1616 switch (num) {
1617 case 0:
1618 if ((ic_myaddr = in_aton(ip)) == ANY)
1619 ic_myaddr = NONE;
1620 break;
1621 case 1:
1622 if ((ic_servaddr = in_aton(ip)) == ANY)
1623 ic_servaddr = NONE;
1624 break;
1625 case 2:
1626 if ((ic_gateway = in_aton(ip)) == ANY)
1627 ic_gateway = NONE;
1628 break;
1629 case 3:
1630 if ((ic_netmask = in_aton(ip)) == ANY)
1631 ic_netmask = NONE;
1632 break;
1633 case 4:
1634 if ((dp = strchr(ip, '.'))) {
1635 *dp++ = '\0';
1636 strlcpy(utsname()->domainname, dp,
1637 sizeof(utsname()->domainname));
1638 }
1639 strlcpy(utsname()->nodename, ip,
1640 sizeof(utsname()->nodename));
1641 ic_host_name_set = 1;
1642 break;
1643 case 5:
1644 strlcpy(user_dev_name, ip, sizeof(user_dev_name));
1645 break;
1646 case 6:
1647 if (ic_proto_name(ip) == 0 &&
1648 ic_myaddr == NONE) {
1649 ic_enable = 0;
1650 }
1651 break;
1652 case 7:
1653 if (CONF_NAMESERVERS_MAX >= 1) {
1654 ic_nameservers[0] = in_aton(ip);
1655 if (ic_nameservers[0] == ANY)
1656 ic_nameservers[0] = NONE;
1657 }
1658 break;
1659 case 8:
1660 if (CONF_NAMESERVERS_MAX >= 2) {
1661 ic_nameservers[1] = in_aton(ip);
1662 if (ic_nameservers[1] == ANY)
1663 ic_nameservers[1] = NONE;
1664 }
1665 break;
1666 }
1667 }
1668 ip = cp;
1669 num++;
1670 }
1671
1672 return 1;
1673 }
1674 __setup("ip=", ip_auto_config_setup);
1675
1676 static int __init nfsaddrs_config_setup(char *addrs)
1677 {
1678 return ip_auto_config_setup(addrs);
1679 }
1680 __setup("nfsaddrs=", nfsaddrs_config_setup);
1681
1682 static int __init vendor_class_identifier_setup(char *addrs)
1683 {
1684 if (strlcpy(vendor_class_identifier, addrs,
1685 sizeof(vendor_class_identifier))
1686 >= sizeof(vendor_class_identifier))
1687 pr_warn("DHCP: vendorclass too long, truncated to \"%s\"",
1688 vendor_class_identifier);
1689 return 1;
1690 }
1691 __setup("dhcpclass=", vendor_class_identifier_setup);
Linux kernel - Deliverables
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