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ASoC: wm_adsp: Use correct local length in error message
[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 #if defined(CONFIG_IP_PNP_DHCP)
69 #define IPCONFIG_DHCP
70 #endif
71 #if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_DHCP)
72 #define IPCONFIG_BOOTP
73 #endif
74 #if defined(CONFIG_IP_PNP_RARP)
75 #define IPCONFIG_RARP
76 #endif
77 #if defined(IPCONFIG_BOOTP) || defined(IPCONFIG_RARP)
78 #define IPCONFIG_DYNAMIC
79 #endif
80
81 /* Define the friendly delay before and after opening net devices */
82 #define CONF_POST_OPEN 10 /* After opening: 10 msecs */
83 #define CONF_CARRIER_TIMEOUT 120000 /* Wait for carrier timeout */
84
85 /* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */
86 #define CONF_OPEN_RETRIES 2 /* (Re)open devices twice */
87 #define CONF_SEND_RETRIES 6 /* Send six requests per open */
88 #define CONF_INTER_TIMEOUT (HZ) /* Inter-device timeout: 1 second */
89 #define CONF_BASE_TIMEOUT (HZ*2) /* Initial timeout: 2 seconds */
90 #define CONF_TIMEOUT_RANDOM (HZ) /* Maximum amount of randomization */
91 #define CONF_TIMEOUT_MULT *7/4 /* Rate of timeout growth */
92 #define CONF_TIMEOUT_MAX (HZ*30) /* Maximum allowed timeout */
93 #define CONF_NAMESERVERS_MAX 3 /* Maximum number of nameservers
94 - '3' from resolv.h */
95
96 #define NONE cpu_to_be32(INADDR_NONE)
97 #define ANY cpu_to_be32(INADDR_ANY)
98
99 /*
100 * Public IP configuration
101 */
102
103 /* This is used by platforms which might be able to set the ipconfig
104 * variables using firmware environment vars. If this is set, it will
105 * ignore such firmware variables.
106 */
107 int ic_set_manually __initdata = 0; /* IPconfig parameters set manually */
108
109 static int ic_enable __initdata; /* IP config enabled? */
110
111 /* Protocol choice */
112 int ic_proto_enabled __initdata = 0
113 #ifdef IPCONFIG_BOOTP
114 | IC_BOOTP
115 #endif
116 #ifdef CONFIG_IP_PNP_DHCP
117 | IC_USE_DHCP
118 #endif
119 #ifdef IPCONFIG_RARP
120 | IC_RARP
121 #endif
122 ;
123
124 static int ic_host_name_set __initdata; /* Host name set by us? */
125
126 __be32 ic_myaddr = NONE; /* My IP address */
127 static __be32 ic_netmask = NONE; /* Netmask for local subnet */
128 __be32 ic_gateway = NONE; /* Gateway IP address */
129
130 __be32 ic_addrservaddr = NONE; /* IP Address of the IP addresses'server */
131
132 __be32 ic_servaddr = NONE; /* Boot server IP address */
133
134 __be32 root_server_addr = NONE; /* Address of NFS server */
135 u8 root_server_path[256] = { 0, }; /* Path to mount as root */
136
137 /* vendor class identifier */
138 static char vendor_class_identifier[253] __initdata;
139
140 #if defined(CONFIG_IP_PNP_DHCP)
141 static char dhcp_client_identifier[253] __initdata;
142 #endif
143
144 /* Persistent data: */
145
146 static int ic_proto_used; /* Protocol used, if any */
147 static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */
148 static u8 ic_domain[64]; /* DNS (not NIS) domain name */
149
150 /*
151 * Private state.
152 */
153
154 /* Name of user-selected boot device */
155 static char user_dev_name[IFNAMSIZ] __initdata = { 0, };
156
157 /* Protocols supported by available interfaces */
158 static int ic_proto_have_if __initdata;
159
160 /* MTU for boot device */
161 static int ic_dev_mtu __initdata;
162
163 #ifdef IPCONFIG_DYNAMIC
164 static DEFINE_SPINLOCK(ic_recv_lock);
165 static volatile int ic_got_reply __initdata; /* Proto(s) that replied */
166 #endif
167 #ifdef IPCONFIG_DHCP
168 static int ic_dhcp_msgtype __initdata; /* DHCP msg type received */
169 #endif
170
171
172 /*
173 * Network devices
174 */
175
176 struct ic_device {
177 struct ic_device *next;
178 struct net_device *dev;
179 unsigned short flags;
180 short able;
181 __be32 xid;
182 };
183
184 static struct ic_device *ic_first_dev __initdata; /* List of open device */
185 static struct net_device *ic_dev __initdata; /* Selected device */
186
187 static bool __init ic_is_init_dev(struct net_device *dev)
188 {
189 if (dev->flags & IFF_LOOPBACK)
190 return false;
191 return user_dev_name[0] ? !strcmp(dev->name, user_dev_name) :
192 (!(dev->flags & IFF_LOOPBACK) &&
193 (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) &&
194 strncmp(dev->name, "dummy", 5));
195 }
196
197 static int __init ic_open_devs(void)
198 {
199 struct ic_device *d, **last;
200 struct net_device *dev;
201 unsigned short oflags;
202 unsigned long start, next_msg;
203
204 last = &ic_first_dev;
205 rtnl_lock();
206
207 /* bring loopback and DSA master network devices up first */
208 for_each_netdev(&init_net, dev) {
209 if (!(dev->flags & IFF_LOOPBACK) && !netdev_uses_dsa(dev))
210 continue;
211 if (dev_change_flags(dev, dev->flags | IFF_UP) < 0)
212 pr_err("IP-Config: Failed to open %s\n", dev->name);
213 }
214
215 for_each_netdev(&init_net, dev) {
216 if (ic_is_init_dev(dev)) {
217 int able = 0;
218 if (dev->mtu >= 364)
219 able |= IC_BOOTP;
220 else
221 pr_warn("DHCP/BOOTP: Ignoring device %s, MTU %d too small\n",
222 dev->name, dev->mtu);
223 if (!(dev->flags & IFF_NOARP))
224 able |= IC_RARP;
225 able &= ic_proto_enabled;
226 if (ic_proto_enabled && !able)
227 continue;
228 oflags = dev->flags;
229 if (dev_change_flags(dev, oflags | IFF_UP) < 0) {
230 pr_err("IP-Config: Failed to open %s\n",
231 dev->name);
232 continue;
233 }
234 if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) {
235 rtnl_unlock();
236 return -ENOMEM;
237 }
238 d->dev = dev;
239 *last = d;
240 last = &d->next;
241 d->flags = oflags;
242 d->able = able;
243 if (able & IC_BOOTP)
244 get_random_bytes(&d->xid, sizeof(__be32));
245 else
246 d->xid = 0;
247 ic_proto_have_if |= able;
248 pr_debug("IP-Config: %s UP (able=%d, xid=%08x)\n",
249 dev->name, able, d->xid);
250 }
251 }
252
253 /* no point in waiting if we could not bring up at least one device */
254 if (!ic_first_dev)
255 goto have_carrier;
256
257 /* wait for a carrier on at least one device */
258 start = jiffies;
259 next_msg = start + msecs_to_jiffies(CONF_CARRIER_TIMEOUT/12);
260 while (time_before(jiffies, start +
261 msecs_to_jiffies(CONF_CARRIER_TIMEOUT))) {
262 int wait, elapsed;
263
264 for_each_netdev(&init_net, dev)
265 if (ic_is_init_dev(dev) && netif_carrier_ok(dev))
266 goto have_carrier;
267
268 msleep(1);
269
270 if (time_before(jiffies, next_msg))
271 continue;
272
273 elapsed = jiffies_to_msecs(jiffies - start);
274 wait = (CONF_CARRIER_TIMEOUT - elapsed + 500)/1000;
275 pr_info("Waiting up to %d more seconds for network.\n", wait);
276 next_msg = jiffies + msecs_to_jiffies(CONF_CARRIER_TIMEOUT/12);
277 }
278 have_carrier:
279 rtnl_unlock();
280
281 *last = NULL;
282
283 if (!ic_first_dev) {
284 if (user_dev_name[0])
285 pr_err("IP-Config: Device `%s' not found\n",
286 user_dev_name);
287 else
288 pr_err("IP-Config: No network devices available\n");
289 return -ENODEV;
290 }
291 return 0;
292 }
293
294 static void __init ic_close_devs(void)
295 {
296 struct ic_device *d, *next;
297 struct net_device *dev;
298
299 rtnl_lock();
300 next = ic_first_dev;
301 while ((d = next)) {
302 next = d->next;
303 dev = d->dev;
304 if (dev != ic_dev && !netdev_uses_dsa(dev)) {
305 pr_debug("IP-Config: Downing %s\n", dev->name);
306 dev_change_flags(dev, d->flags);
307 }
308 kfree(d);
309 }
310 rtnl_unlock();
311 }
312
313 /*
314 * Interface to various network functions.
315 */
316
317 static inline void
318 set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port)
319 {
320 sin->sin_family = AF_INET;
321 sin->sin_addr.s_addr = addr;
322 sin->sin_port = port;
323 }
324
325 static int __init ic_devinet_ioctl(unsigned int cmd, struct ifreq *arg)
326 {
327 int res;
328
329 mm_segment_t oldfs = get_fs();
330 set_fs(get_ds());
331 res = devinet_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
332 set_fs(oldfs);
333 return res;
334 }
335
336 static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg)
337 {
338 int res;
339
340 mm_segment_t oldfs = get_fs();
341 set_fs(get_ds());
342 res = dev_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
343 set_fs(oldfs);
344 return res;
345 }
346
347 static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg)
348 {
349 int res;
350
351 mm_segment_t oldfs = get_fs();
352 set_fs(get_ds());
353 res = ip_rt_ioctl(&init_net, cmd, (void __user *) arg);
354 set_fs(oldfs);
355 return res;
356 }
357
358 /*
359 * Set up interface addresses and routes.
360 */
361
362 static int __init ic_setup_if(void)
363 {
364 struct ifreq ir;
365 struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr;
366 int err;
367
368 memset(&ir, 0, sizeof(ir));
369 strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name);
370 set_sockaddr(sin, ic_myaddr, 0);
371 if ((err = ic_devinet_ioctl(SIOCSIFADDR, &ir)) < 0) {
372 pr_err("IP-Config: Unable to set interface address (%d)\n",
373 err);
374 return -1;
375 }
376 set_sockaddr(sin, ic_netmask, 0);
377 if ((err = ic_devinet_ioctl(SIOCSIFNETMASK, &ir)) < 0) {
378 pr_err("IP-Config: Unable to set interface netmask (%d)\n",
379 err);
380 return -1;
381 }
382 set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0);
383 if ((err = ic_devinet_ioctl(SIOCSIFBRDADDR, &ir)) < 0) {
384 pr_err("IP-Config: Unable to set interface broadcast address (%d)\n",
385 err);
386 return -1;
387 }
388 /* Handle the case where we need non-standard MTU on the boot link (a network
389 * using jumbo frames, for instance). If we can't set the mtu, don't error
390 * out, we'll try to muddle along.
391 */
392 if (ic_dev_mtu != 0) {
393 strcpy(ir.ifr_name, ic_dev->name);
394 ir.ifr_mtu = ic_dev_mtu;
395 if ((err = ic_dev_ioctl(SIOCSIFMTU, &ir)) < 0)
396 pr_err("IP-Config: Unable to set interface mtu to %d (%d)\n",
397 ic_dev_mtu, err);
398 }
399 return 0;
400 }
401
402 static int __init ic_setup_routes(void)
403 {
404 /* No need to setup device routes, only the default route... */
405
406 if (ic_gateway != NONE) {
407 struct rtentry rm;
408 int err;
409
410 memset(&rm, 0, sizeof(rm));
411 if ((ic_gateway ^ ic_myaddr) & ic_netmask) {
412 pr_err("IP-Config: Gateway not on directly connected network\n");
413 return -1;
414 }
415 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0);
416 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0);
417 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0);
418 rm.rt_flags = RTF_UP | RTF_GATEWAY;
419 if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) {
420 pr_err("IP-Config: Cannot add default route (%d)\n",
421 err);
422 return -1;
423 }
424 }
425
426 return 0;
427 }
428
429 /*
430 * Fill in default values for all missing parameters.
431 */
432
433 static int __init ic_defaults(void)
434 {
435 /*
436 * At this point we have no userspace running so need not
437 * claim locks on system_utsname
438 */
439
440 if (!ic_host_name_set)
441 sprintf(init_utsname()->nodename, "%pI4", &ic_myaddr);
442
443 if (root_server_addr == NONE)
444 root_server_addr = ic_servaddr;
445
446 if (ic_netmask == NONE) {
447 if (IN_CLASSA(ntohl(ic_myaddr)))
448 ic_netmask = htonl(IN_CLASSA_NET);
449 else if (IN_CLASSB(ntohl(ic_myaddr)))
450 ic_netmask = htonl(IN_CLASSB_NET);
451 else if (IN_CLASSC(ntohl(ic_myaddr)))
452 ic_netmask = htonl(IN_CLASSC_NET);
453 else {
454 pr_err("IP-Config: Unable to guess netmask for address %pI4\n",
455 &ic_myaddr);
456 return -1;
457 }
458 pr_notice("IP-Config: Guessing netmask %pI4\n",
459 &ic_netmask);
460 }
461
462 return 0;
463 }
464
465 /*
466 * RARP support.
467 */
468
469 #ifdef IPCONFIG_RARP
470
471 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
472
473 static struct packet_type rarp_packet_type __initdata = {
474 .type = cpu_to_be16(ETH_P_RARP),
475 .func = ic_rarp_recv,
476 };
477
478 static inline void __init ic_rarp_init(void)
479 {
480 dev_add_pack(&rarp_packet_type);
481 }
482
483 static inline void __init ic_rarp_cleanup(void)
484 {
485 dev_remove_pack(&rarp_packet_type);
486 }
487
488 /*
489 * Process received RARP packet.
490 */
491 static int __init
492 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
493 {
494 struct arphdr *rarp;
495 unsigned char *rarp_ptr;
496 __be32 sip, tip;
497 unsigned char *tha; /* t for "target" */
498 struct ic_device *d;
499
500 if (!net_eq(dev_net(dev), &init_net))
501 goto drop;
502
503 skb = skb_share_check(skb, GFP_ATOMIC);
504 if (!skb)
505 return NET_RX_DROP;
506
507 if (!pskb_may_pull(skb, sizeof(struct arphdr)))
508 goto drop;
509
510 /* Basic sanity checks can be done without the lock. */
511 rarp = (struct arphdr *)skb_transport_header(skb);
512
513 /* If this test doesn't pass, it's not IP, or we should
514 * ignore it anyway.
515 */
516 if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd))
517 goto drop;
518
519 /* If it's not a RARP reply, delete it. */
520 if (rarp->ar_op != htons(ARPOP_RREPLY))
521 goto drop;
522
523 /* If it's not Ethernet, delete it. */
524 if (rarp->ar_pro != htons(ETH_P_IP))
525 goto drop;
526
527 if (!pskb_may_pull(skb, arp_hdr_len(dev)))
528 goto drop;
529
530 /* OK, it is all there and looks valid, process... */
531 rarp = (struct arphdr *)skb_transport_header(skb);
532 rarp_ptr = (unsigned char *) (rarp + 1);
533
534 /* One reply at a time, please. */
535 spin_lock(&ic_recv_lock);
536
537 /* If we already have a reply, just drop the packet */
538 if (ic_got_reply)
539 goto drop_unlock;
540
541 /* Find the ic_device that the packet arrived on */
542 d = ic_first_dev;
543 while (d && d->dev != dev)
544 d = d->next;
545 if (!d)
546 goto drop_unlock; /* should never happen */
547
548 /* Extract variable-width fields */
549 rarp_ptr += dev->addr_len;
550 memcpy(&sip, rarp_ptr, 4);
551 rarp_ptr += 4;
552 tha = rarp_ptr;
553 rarp_ptr += dev->addr_len;
554 memcpy(&tip, rarp_ptr, 4);
555
556 /* Discard packets which are not meant for us. */
557 if (memcmp(tha, dev->dev_addr, dev->addr_len))
558 goto drop_unlock;
559
560 /* Discard packets which are not from specified server. */
561 if (ic_servaddr != NONE && ic_servaddr != sip)
562 goto drop_unlock;
563
564 /* We have a winner! */
565 ic_dev = dev;
566 if (ic_myaddr == NONE)
567 ic_myaddr = tip;
568 ic_servaddr = sip;
569 ic_addrservaddr = sip;
570 ic_got_reply = IC_RARP;
571
572 drop_unlock:
573 /* Show's over. Nothing to see here. */
574 spin_unlock(&ic_recv_lock);
575
576 drop:
577 /* Throw the packet out. */
578 kfree_skb(skb);
579 return 0;
580 }
581
582
583 /*
584 * Send RARP request packet over a single interface.
585 */
586 static void __init ic_rarp_send_if(struct ic_device *d)
587 {
588 struct net_device *dev = d->dev;
589 arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL,
590 dev->dev_addr, dev->dev_addr);
591 }
592 #endif
593
594 /*
595 * Predefine Nameservers
596 */
597 static inline void __init ic_nameservers_predef(void)
598 {
599 int i;
600
601 for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
602 ic_nameservers[i] = NONE;
603 }
604
605 /*
606 * DHCP/BOOTP support.
607 */
608
609 #ifdef IPCONFIG_BOOTP
610
611 struct bootp_pkt { /* BOOTP packet format */
612 struct iphdr iph; /* IP header */
613 struct udphdr udph; /* UDP header */
614 u8 op; /* 1=request, 2=reply */
615 u8 htype; /* HW address type */
616 u8 hlen; /* HW address length */
617 u8 hops; /* Used only by gateways */
618 __be32 xid; /* Transaction ID */
619 __be16 secs; /* Seconds since we started */
620 __be16 flags; /* Just what it says */
621 __be32 client_ip; /* Client's IP address if known */
622 __be32 your_ip; /* Assigned IP address */
623 __be32 server_ip; /* (Next, e.g. NFS) Server's IP address */
624 __be32 relay_ip; /* IP address of BOOTP relay */
625 u8 hw_addr[16]; /* Client's HW address */
626 u8 serv_name[64]; /* Server host name */
627 u8 boot_file[128]; /* Name of boot file */
628 u8 exten[312]; /* DHCP options / BOOTP vendor extensions */
629 };
630
631 /* packet ops */
632 #define BOOTP_REQUEST 1
633 #define BOOTP_REPLY 2
634
635 /* DHCP message types */
636 #define DHCPDISCOVER 1
637 #define DHCPOFFER 2
638 #define DHCPREQUEST 3
639 #define DHCPDECLINE 4
640 #define DHCPACK 5
641 #define DHCPNAK 6
642 #define DHCPRELEASE 7
643 #define DHCPINFORM 8
644
645 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
646
647 static struct packet_type bootp_packet_type __initdata = {
648 .type = cpu_to_be16(ETH_P_IP),
649 .func = ic_bootp_recv,
650 };
651
652 static __be32 ic_dev_xid; /* Device under configuration */
653
654 /*
655 * Initialize DHCP/BOOTP extension fields in the request.
656 */
657
658 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 };
659
660 #ifdef IPCONFIG_DHCP
661
662 static void __init
663 ic_dhcp_init_options(u8 *options)
664 {
665 u8 mt = ((ic_servaddr == NONE)
666 ? DHCPDISCOVER : DHCPREQUEST);
667 u8 *e = options;
668 int len;
669
670 pr_debug("DHCP: Sending message type %d\n", mt);
671
672 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */
673 e += 4;
674
675 *e++ = 53; /* DHCP message type */
676 *e++ = 1;
677 *e++ = mt;
678
679 if (mt == DHCPREQUEST) {
680 *e++ = 54; /* Server ID (IP address) */
681 *e++ = 4;
682 memcpy(e, &ic_servaddr, 4);
683 e += 4;
684
685 *e++ = 50; /* Requested IP address */
686 *e++ = 4;
687 memcpy(e, &ic_myaddr, 4);
688 e += 4;
689 }
690
691 /* always? */
692 {
693 static const u8 ic_req_params[] = {
694 1, /* Subnet mask */
695 3, /* Default gateway */
696 6, /* DNS server */
697 12, /* Host name */
698 15, /* Domain name */
699 17, /* Boot path */
700 26, /* MTU */
701 40, /* NIS domain name */
702 };
703
704 *e++ = 55; /* Parameter request list */
705 *e++ = sizeof(ic_req_params);
706 memcpy(e, ic_req_params, sizeof(ic_req_params));
707 e += sizeof(ic_req_params);
708
709 if (ic_host_name_set) {
710 *e++ = 12; /* host-name */
711 len = strlen(utsname()->nodename);
712 *e++ = len;
713 memcpy(e, utsname()->nodename, len);
714 e += len;
715 }
716 if (*vendor_class_identifier) {
717 pr_info("DHCP: sending class identifier \"%s\"\n",
718 vendor_class_identifier);
719 *e++ = 60; /* Class-identifier */
720 len = strlen(vendor_class_identifier);
721 *e++ = len;
722 memcpy(e, vendor_class_identifier, len);
723 e += len;
724 }
725 len = strlen(dhcp_client_identifier + 1);
726 /* the minimum length of identifier is 2, include 1 byte type,
727 * and can not be larger than the length of options
728 */
729 if (len >= 1 && len < 312 - (e - options) - 1) {
730 *e++ = 61;
731 *e++ = len + 1;
732 memcpy(e, dhcp_client_identifier, len + 1);
733 e += len + 1;
734 }
735 }
736
737 *e++ = 255; /* End of the list */
738 }
739
740 #endif /* IPCONFIG_DHCP */
741
742 static void __init ic_bootp_init_ext(u8 *e)
743 {
744 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */
745 e += 4;
746 *e++ = 1; /* Subnet mask request */
747 *e++ = 4;
748 e += 4;
749 *e++ = 3; /* Default gateway request */
750 *e++ = 4;
751 e += 4;
752 *e++ = 5; /* Name server request */
753 *e++ = 8;
754 e += 8;
755 *e++ = 12; /* Host name request */
756 *e++ = 32;
757 e += 32;
758 *e++ = 40; /* NIS Domain name request */
759 *e++ = 32;
760 e += 32;
761 *e++ = 17; /* Boot path */
762 *e++ = 40;
763 e += 40;
764
765 *e++ = 57; /* set extension buffer size for reply */
766 *e++ = 2;
767 *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */
768 *e++ = 150;
769
770 *e++ = 255; /* End of the list */
771 }
772
773
774 /*
775 * Initialize the DHCP/BOOTP mechanism.
776 */
777 static inline void __init ic_bootp_init(void)
778 {
779 ic_nameservers_predef();
780
781 dev_add_pack(&bootp_packet_type);
782 }
783
784
785 /*
786 * DHCP/BOOTP cleanup.
787 */
788 static inline void __init ic_bootp_cleanup(void)
789 {
790 dev_remove_pack(&bootp_packet_type);
791 }
792
793
794 /*
795 * Send DHCP/BOOTP request to single interface.
796 */
797 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff)
798 {
799 struct net_device *dev = d->dev;
800 struct sk_buff *skb;
801 struct bootp_pkt *b;
802 struct iphdr *h;
803 int hlen = LL_RESERVED_SPACE(dev);
804 int tlen = dev->needed_tailroom;
805
806 /* Allocate packet */
807 skb = alloc_skb(sizeof(struct bootp_pkt) + hlen + tlen + 15,
808 GFP_KERNEL);
809 if (!skb)
810 return;
811 skb_reserve(skb, hlen);
812 b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt));
813 memset(b, 0, sizeof(struct bootp_pkt));
814
815 /* Construct IP header */
816 skb_reset_network_header(skb);
817 h = ip_hdr(skb);
818 h->version = 4;
819 h->ihl = 5;
820 h->tot_len = htons(sizeof(struct bootp_pkt));
821 h->frag_off = htons(IP_DF);
822 h->ttl = 64;
823 h->protocol = IPPROTO_UDP;
824 h->daddr = htonl(INADDR_BROADCAST);
825 h->check = ip_fast_csum((unsigned char *) h, h->ihl);
826
827 /* Construct UDP header */
828 b->udph.source = htons(68);
829 b->udph.dest = htons(67);
830 b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr));
831 /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */
832
833 /* Construct DHCP/BOOTP header */
834 b->op = BOOTP_REQUEST;
835 if (dev->type < 256) /* check for false types */
836 b->htype = dev->type;
837 else if (dev->type == ARPHRD_FDDI)
838 b->htype = ARPHRD_ETHER;
839 else {
840 pr_warn("Unknown ARP type 0x%04x for device %s\n", dev->type,
841 dev->name);
842 b->htype = dev->type; /* can cause undefined behavior */
843 }
844
845 /* server_ip and your_ip address are both already zero per RFC2131 */
846 b->hlen = dev->addr_len;
847 memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
848 b->secs = htons(jiffies_diff / HZ);
849 b->xid = d->xid;
850
851 /* add DHCP options or BOOTP extensions */
852 #ifdef IPCONFIG_DHCP
853 if (ic_proto_enabled & IC_USE_DHCP)
854 ic_dhcp_init_options(b->exten);
855 else
856 #endif
857 ic_bootp_init_ext(b->exten);
858
859 /* Chain packet down the line... */
860 skb->dev = dev;
861 skb->protocol = htons(ETH_P_IP);
862 if (dev_hard_header(skb, dev, ntohs(skb->protocol),
863 dev->broadcast, dev->dev_addr, skb->len) < 0) {
864 kfree_skb(skb);
865 printk("E");
866 return;
867 }
868
869 if (dev_queue_xmit(skb) < 0)
870 printk("E");
871 }
872
873
874 /*
875 * Copy BOOTP-supplied string if not already set.
876 */
877 static int __init ic_bootp_string(char *dest, char *src, int len, int max)
878 {
879 if (!len)
880 return 0;
881 if (len > max-1)
882 len = max-1;
883 memcpy(dest, src, len);
884 dest[len] = '\0';
885 return 1;
886 }
887
888
889 /*
890 * Process BOOTP extensions.
891 */
892 static void __init ic_do_bootp_ext(u8 *ext)
893 {
894 u8 servers;
895 int i;
896 __be16 mtu;
897
898 u8 *c;
899
900 pr_debug("DHCP/BOOTP: Got extension %d:", *ext);
901 for (c=ext+2; c<ext+2+ext[1]; c++)
902 pr_debug(" %02x", *c);
903 pr_debug("\n");
904
905 switch (*ext++) {
906 case 1: /* Subnet mask */
907 if (ic_netmask == NONE)
908 memcpy(&ic_netmask, ext+1, 4);
909 break;
910 case 3: /* Default gateway */
911 if (ic_gateway == NONE)
912 memcpy(&ic_gateway, ext+1, 4);
913 break;
914 case 6: /* DNS server */
915 servers= *ext/4;
916 if (servers > CONF_NAMESERVERS_MAX)
917 servers = CONF_NAMESERVERS_MAX;
918 for (i = 0; i < servers; i++) {
919 if (ic_nameservers[i] == NONE)
920 memcpy(&ic_nameservers[i], ext+1+4*i, 4);
921 }
922 break;
923 case 12: /* Host name */
924 ic_bootp_string(utsname()->nodename, ext+1, *ext,
925 __NEW_UTS_LEN);
926 ic_host_name_set = 1;
927 break;
928 case 15: /* Domain name (DNS) */
929 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
930 break;
931 case 17: /* Root path */
932 if (!root_server_path[0])
933 ic_bootp_string(root_server_path, ext+1, *ext,
934 sizeof(root_server_path));
935 break;
936 case 26: /* Interface MTU */
937 memcpy(&mtu, ext+1, sizeof(mtu));
938 ic_dev_mtu = ntohs(mtu);
939 break;
940 case 40: /* NIS Domain name (_not_ DNS) */
941 ic_bootp_string(utsname()->domainname, ext+1, *ext,
942 __NEW_UTS_LEN);
943 break;
944 }
945 }
946
947
948 /*
949 * Receive BOOTP reply.
950 */
951 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
952 {
953 struct bootp_pkt *b;
954 struct iphdr *h;
955 struct ic_device *d;
956 int len, ext_len;
957
958 if (!net_eq(dev_net(dev), &init_net))
959 goto drop;
960
961 /* Perform verifications before taking the lock. */
962 if (skb->pkt_type == PACKET_OTHERHOST)
963 goto drop;
964
965 skb = skb_share_check(skb, GFP_ATOMIC);
966 if (!skb)
967 return NET_RX_DROP;
968
969 if (!pskb_may_pull(skb,
970 sizeof(struct iphdr) +
971 sizeof(struct udphdr)))
972 goto drop;
973
974 b = (struct bootp_pkt *)skb_network_header(skb);
975 h = &b->iph;
976
977 if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP)
978 goto drop;
979
980 /* Fragments are not supported */
981 if (ip_is_fragment(h)) {
982 net_err_ratelimited("DHCP/BOOTP: Ignoring fragmented reply\n");
983 goto drop;
984 }
985
986 if (skb->len < ntohs(h->tot_len))
987 goto drop;
988
989 if (ip_fast_csum((char *) h, h->ihl))
990 goto drop;
991
992 if (b->udph.source != htons(67) || b->udph.dest != htons(68))
993 goto drop;
994
995 if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
996 goto drop;
997
998 len = ntohs(b->udph.len) - sizeof(struct udphdr);
999 ext_len = len - (sizeof(*b) -
1000 sizeof(struct iphdr) -
1001 sizeof(struct udphdr) -
1002 sizeof(b->exten));
1003 if (ext_len < 0)
1004 goto drop;
1005
1006 /* Ok the front looks good, make sure we can get at the rest. */
1007 if (!pskb_may_pull(skb, skb->len))
1008 goto drop;
1009
1010 b = (struct bootp_pkt *)skb_network_header(skb);
1011 h = &b->iph;
1012
1013 /* One reply at a time, please. */
1014 spin_lock(&ic_recv_lock);
1015
1016 /* If we already have a reply, just drop the packet */
1017 if (ic_got_reply)
1018 goto drop_unlock;
1019
1020 /* Find the ic_device that the packet arrived on */
1021 d = ic_first_dev;
1022 while (d && d->dev != dev)
1023 d = d->next;
1024 if (!d)
1025 goto drop_unlock; /* should never happen */
1026
1027 /* Is it a reply to our BOOTP request? */
1028 if (b->op != BOOTP_REPLY ||
1029 b->xid != d->xid) {
1030 net_err_ratelimited("DHCP/BOOTP: Reply not for us, op[%x] xid[%x]\n",
1031 b->op, b->xid);
1032 goto drop_unlock;
1033 }
1034
1035 /* Is it a reply for the device we are configuring? */
1036 if (b->xid != ic_dev_xid) {
1037 net_err_ratelimited("DHCP/BOOTP: Ignoring delayed packet\n");
1038 goto drop_unlock;
1039 }
1040
1041 /* Parse extensions */
1042 if (ext_len >= 4 &&
1043 !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */
1044 u8 *end = (u8 *) b + ntohs(b->iph.tot_len);
1045 u8 *ext;
1046
1047 #ifdef IPCONFIG_DHCP
1048 if (ic_proto_enabled & IC_USE_DHCP) {
1049 __be32 server_id = NONE;
1050 int mt = 0;
1051
1052 ext = &b->exten[4];
1053 while (ext < end && *ext != 0xff) {
1054 u8 *opt = ext++;
1055 if (*opt == 0) /* Padding */
1056 continue;
1057 ext += *ext + 1;
1058 if (ext >= end)
1059 break;
1060 switch (*opt) {
1061 case 53: /* Message type */
1062 if (opt[1])
1063 mt = opt[2];
1064 break;
1065 case 54: /* Server ID (IP address) */
1066 if (opt[1] >= 4)
1067 memcpy(&server_id, opt + 2, 4);
1068 break;
1069 }
1070 }
1071
1072 pr_debug("DHCP: Got message type %d\n", mt);
1073
1074 switch (mt) {
1075 case DHCPOFFER:
1076 /* While in the process of accepting one offer,
1077 * ignore all others.
1078 */
1079 if (ic_myaddr != NONE)
1080 goto drop_unlock;
1081
1082 /* Let's accept that offer. */
1083 ic_myaddr = b->your_ip;
1084 ic_servaddr = server_id;
1085 pr_debug("DHCP: Offered address %pI4 by server %pI4\n",
1086 &ic_myaddr, &b->iph.saddr);
1087 /* The DHCP indicated server address takes
1088 * precedence over the bootp header one if
1089 * they are different.
1090 */
1091 if ((server_id != NONE) &&
1092 (b->server_ip != server_id))
1093 b->server_ip = ic_servaddr;
1094 break;
1095
1096 case DHCPACK:
1097 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0)
1098 goto drop_unlock;
1099
1100 /* Yeah! */
1101 break;
1102
1103 default:
1104 /* Urque. Forget it*/
1105 ic_myaddr = NONE;
1106 ic_servaddr = NONE;
1107 goto drop_unlock;
1108 }
1109
1110 ic_dhcp_msgtype = mt;
1111
1112 }
1113 #endif /* IPCONFIG_DHCP */
1114
1115 ext = &b->exten[4];
1116 while (ext < end && *ext != 0xff) {
1117 u8 *opt = ext++;
1118 if (*opt == 0) /* Padding */
1119 continue;
1120 ext += *ext + 1;
1121 if (ext < end)
1122 ic_do_bootp_ext(opt);
1123 }
1124 }
1125
1126 /* We have a winner! */
1127 ic_dev = dev;
1128 ic_myaddr = b->your_ip;
1129 ic_servaddr = b->server_ip;
1130 ic_addrservaddr = b->iph.saddr;
1131 if (ic_gateway == NONE && b->relay_ip)
1132 ic_gateway = b->relay_ip;
1133 if (ic_nameservers[0] == NONE)
1134 ic_nameservers[0] = ic_servaddr;
1135 ic_got_reply = IC_BOOTP;
1136
1137 drop_unlock:
1138 /* Show's over. Nothing to see here. */
1139 spin_unlock(&ic_recv_lock);
1140
1141 drop:
1142 /* Throw the packet out. */
1143 kfree_skb(skb);
1144
1145 return 0;
1146 }
1147
1148
1149 #endif
1150
1151
1152 /*
1153 * Dynamic IP configuration -- DHCP, BOOTP, RARP.
1154 */
1155
1156 #ifdef IPCONFIG_DYNAMIC
1157
1158 static int __init ic_dynamic(void)
1159 {
1160 int retries;
1161 struct ic_device *d;
1162 unsigned long start_jiffies, timeout, jiff;
1163 int do_bootp = ic_proto_have_if & IC_BOOTP;
1164 int do_rarp = ic_proto_have_if & IC_RARP;
1165
1166 /*
1167 * If none of DHCP/BOOTP/RARP was selected, return with an error.
1168 * This routine gets only called when some pieces of information
1169 * are missing, and without DHCP/BOOTP/RARP we are unable to get it.
1170 */
1171 if (!ic_proto_enabled) {
1172 pr_err("IP-Config: Incomplete network configuration information\n");
1173 return -1;
1174 }
1175
1176 #ifdef IPCONFIG_BOOTP
1177 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
1178 pr_err("DHCP/BOOTP: No suitable device found\n");
1179 #endif
1180 #ifdef IPCONFIG_RARP
1181 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)
1182 pr_err("RARP: No suitable device found\n");
1183 #endif
1184
1185 if (!ic_proto_have_if)
1186 /* Error message already printed */
1187 return -1;
1188
1189 /*
1190 * Setup protocols
1191 */
1192 #ifdef IPCONFIG_BOOTP
1193 if (do_bootp)
1194 ic_bootp_init();
1195 #endif
1196 #ifdef IPCONFIG_RARP
1197 if (do_rarp)
1198 ic_rarp_init();
1199 #endif
1200
1201 /*
1202 * Send requests and wait, until we get an answer. This loop
1203 * seems to be a terrible waste of CPU time, but actually there is
1204 * only one process running at all, so we don't need to use any
1205 * scheduler functions.
1206 * [Actually we could now, but the nothing else running note still
1207 * applies.. - AC]
1208 */
1209 pr_notice("Sending %s%s%s requests .",
1210 do_bootp
1211 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "",
1212 (do_bootp && do_rarp) ? " and " : "",
1213 do_rarp ? "RARP" : "");
1214
1215 start_jiffies = jiffies;
1216 d = ic_first_dev;
1217 retries = CONF_SEND_RETRIES;
1218 get_random_bytes(&timeout, sizeof(timeout));
1219 timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned int) CONF_TIMEOUT_RANDOM);
1220 for (;;) {
1221 #ifdef IPCONFIG_BOOTP
1222 /* Track the device we are configuring */
1223 ic_dev_xid = d->xid;
1224
1225 if (do_bootp && (d->able & IC_BOOTP))
1226 ic_bootp_send_if(d, jiffies - start_jiffies);
1227 #endif
1228 #ifdef IPCONFIG_RARP
1229 if (do_rarp && (d->able & IC_RARP))
1230 ic_rarp_send_if(d);
1231 #endif
1232
1233 jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout);
1234 while (time_before(jiffies, jiff) && !ic_got_reply)
1235 schedule_timeout_uninterruptible(1);
1236 #ifdef IPCONFIG_DHCP
1237 /* DHCP isn't done until we get a DHCPACK. */
1238 if ((ic_got_reply & IC_BOOTP) &&
1239 (ic_proto_enabled & IC_USE_DHCP) &&
1240 ic_dhcp_msgtype != DHCPACK) {
1241 ic_got_reply = 0;
1242 pr_cont(",");
1243 continue;
1244 }
1245 #endif /* IPCONFIG_DHCP */
1246
1247 if (ic_got_reply) {
1248 pr_cont(" OK\n");
1249 break;
1250 }
1251
1252 if ((d = d->next))
1253 continue;
1254
1255 if (! --retries) {
1256 pr_cont(" timed out!\n");
1257 break;
1258 }
1259
1260 d = ic_first_dev;
1261
1262 timeout = timeout CONF_TIMEOUT_MULT;
1263 if (timeout > CONF_TIMEOUT_MAX)
1264 timeout = CONF_TIMEOUT_MAX;
1265
1266 pr_cont(".");
1267 }
1268
1269 #ifdef IPCONFIG_BOOTP
1270 if (do_bootp)
1271 ic_bootp_cleanup();
1272 #endif
1273 #ifdef IPCONFIG_RARP
1274 if (do_rarp)
1275 ic_rarp_cleanup();
1276 #endif
1277
1278 if (!ic_got_reply) {
1279 ic_myaddr = NONE;
1280 return -1;
1281 }
1282
1283 pr_info("IP-Config: Got %s answer from %pI4, my address is %pI4\n",
1284 ((ic_got_reply & IC_RARP) ? "RARP"
1285 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),
1286 &ic_addrservaddr, &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 pr_debug("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_cont(" 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 (!strncmp(name, "dhcp", 4)) {
1559 char *client_id;
1560
1561 ic_proto_enabled &= ~IC_RARP;
1562 client_id = strstr(name, "dhcp,");
1563 if (client_id) {
1564 char *v;
1565
1566 client_id = client_id + 5;
1567 v = strchr(client_id, ',');
1568 if (!v)
1569 return 1;
1570 *v = 0;
1571 if (kstrtou8(client_id, 0, dhcp_client_identifier))
1572 pr_debug("DHCP: Invalid client identifier type\n");
1573 strncpy(dhcp_client_identifier + 1, v + 1, 251);
1574 *v = ',';
1575 }
1576 return 1;
1577 }
1578 #endif
1579 #ifdef CONFIG_IP_PNP_BOOTP
1580 else if (!strcmp(name, "bootp")) {
1581 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP);
1582 return 1;
1583 }
1584 #endif
1585 #ifdef CONFIG_IP_PNP_RARP
1586 else if (!strcmp(name, "rarp")) {
1587 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP);
1588 return 1;
1589 }
1590 #endif
1591 #ifdef IPCONFIG_DYNAMIC
1592 else if (!strcmp(name, "both")) {
1593 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */
1594 return 1;
1595 }
1596 #endif
1597 return 0;
1598 }
1599
1600 static int __init ip_auto_config_setup(char *addrs)
1601 {
1602 char *cp, *ip, *dp;
1603 int num = 0;
1604
1605 ic_set_manually = 1;
1606 ic_enable = 1;
1607
1608 /*
1609 * If any dhcp, bootp etc options are set, leave autoconfig on
1610 * and skip the below static IP processing.
1611 */
1612 if (ic_proto_name(addrs))
1613 return 1;
1614
1615 /* If no static IP is given, turn off autoconfig and bail. */
1616 if (*addrs == 0 ||
1617 strcmp(addrs, "off") == 0 ||
1618 strcmp(addrs, "none") == 0) {
1619 ic_enable = 0;
1620 return 1;
1621 }
1622
1623 ic_nameservers_predef();
1624
1625 /* Parse string for static IP assignment. */
1626 ip = addrs;
1627 while (ip && *ip) {
1628 if ((cp = strchr(ip, ':')))
1629 *cp++ = '\0';
1630 if (strlen(ip) > 0) {
1631 pr_debug("IP-Config: Parameter #%d: `%s'\n", num, ip);
1632 switch (num) {
1633 case 0:
1634 if ((ic_myaddr = in_aton(ip)) == ANY)
1635 ic_myaddr = NONE;
1636 break;
1637 case 1:
1638 if ((ic_servaddr = in_aton(ip)) == ANY)
1639 ic_servaddr = NONE;
1640 break;
1641 case 2:
1642 if ((ic_gateway = in_aton(ip)) == ANY)
1643 ic_gateway = NONE;
1644 break;
1645 case 3:
1646 if ((ic_netmask = in_aton(ip)) == ANY)
1647 ic_netmask = NONE;
1648 break;
1649 case 4:
1650 if ((dp = strchr(ip, '.'))) {
1651 *dp++ = '\0';
1652 strlcpy(utsname()->domainname, dp,
1653 sizeof(utsname()->domainname));
1654 }
1655 strlcpy(utsname()->nodename, ip,
1656 sizeof(utsname()->nodename));
1657 ic_host_name_set = 1;
1658 break;
1659 case 5:
1660 strlcpy(user_dev_name, ip, sizeof(user_dev_name));
1661 break;
1662 case 6:
1663 if (ic_proto_name(ip) == 0 &&
1664 ic_myaddr == NONE) {
1665 ic_enable = 0;
1666 }
1667 break;
1668 case 7:
1669 if (CONF_NAMESERVERS_MAX >= 1) {
1670 ic_nameservers[0] = in_aton(ip);
1671 if (ic_nameservers[0] == ANY)
1672 ic_nameservers[0] = NONE;
1673 }
1674 break;
1675 case 8:
1676 if (CONF_NAMESERVERS_MAX >= 2) {
1677 ic_nameservers[1] = in_aton(ip);
1678 if (ic_nameservers[1] == ANY)
1679 ic_nameservers[1] = NONE;
1680 }
1681 break;
1682 }
1683 }
1684 ip = cp;
1685 num++;
1686 }
1687
1688 return 1;
1689 }
1690 __setup("ip=", ip_auto_config_setup);
1691
1692 static int __init nfsaddrs_config_setup(char *addrs)
1693 {
1694 return ip_auto_config_setup(addrs);
1695 }
1696 __setup("nfsaddrs=", nfsaddrs_config_setup);
1697
1698 static int __init vendor_class_identifier_setup(char *addrs)
1699 {
1700 if (strlcpy(vendor_class_identifier, addrs,
1701 sizeof(vendor_class_identifier))
1702 >= sizeof(vendor_class_identifier))
1703 pr_warn("DHCP: vendorclass too long, truncated to \"%s\"\n",
1704 vendor_class_identifier);
1705 return 1;
1706 }
1707 __setup("dhcpclass=", vendor_class_identifier_setup);
Linux kernel - Deliverables
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