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ipconfig.c
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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 <[email protected]>
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 <[email protected]>, 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 <[email protected]>, May 2000
21  *
22  * Ported DHCP support from 2.2.16 to 2.4.0-test4
23  * -- Eric Biederman <[email protected]>, 30 Aug 2000
24  *
25  * Merged changes from 2.2.19 into 2.4.3
26  * -- Eric Biederman <[email protected]>, 22 April Aug 2001
27  *
28  * Multiple Nameservers in /proc/net/pnp
29  * -- Josef Siemes <[email protected]>, Aug 2002
30  */
31 
32 #include <linux/types.h>
33 #include <linux/string.h>
34 #include <linux/kernel.h>
35 #include <linux/jiffies.h>
36 #include <linux/random.h>
37 #include <linux/init.h>
38 #include <linux/utsname.h>
39 #include <linux/in.h>
40 #include <linux/if.h>
41 #include <linux/inet.h>
42 #include <linux/inetdevice.h>
43 #include <linux/netdevice.h>
44 #include <linux/if_arp.h>
45 #include <linux/skbuff.h>
46 #include <linux/ip.h>
47 #include <linux/socket.h>
48 #include <linux/route.h>
49 #include <linux/udp.h>
50 #include <linux/proc_fs.h>
51 #include <linux/seq_file.h>
52 #include <linux/major.h>
53 #include <linux/root_dev.h>
54 #include <linux/delay.h>
55 #include <linux/nfs_fs.h>
56 #include <linux/slab.h>
57 #include <linux/export.h>
58 #include <net/net_namespace.h>
59 #include <net/arp.h>
60 #include <net/ip.h>
61 #include <net/ipconfig.h>
62 #include <net/route.h>
63 
64 #include <asm/uaccess.h>
65 #include <net/checksum.h>
66 #include <asm/processor.h>
67 
68 /* Define this to allow debugging output */
69 #undef IPCONFIG_DEBUG
70 
71 #ifdef IPCONFIG_DEBUG
72 #define DBG(x) printk x
73 #else
74 #define DBG(x) do { } while(0)
75 #endif
76 
77 #if defined(CONFIG_IP_PNP_DHCP)
78 #define IPCONFIG_DHCP
79 #endif
80 #if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_DHCP)
81 #define IPCONFIG_BOOTP
82 #endif
83 #if defined(CONFIG_IP_PNP_RARP)
84 #define IPCONFIG_RARP
85 #endif
86 #if defined(IPCONFIG_BOOTP) || defined(IPCONFIG_RARP)
87 #define IPCONFIG_DYNAMIC
88 #endif
89 
90 /* Define the friendly delay before and after opening net devices */
91 #define CONF_POST_OPEN 10 /* After opening: 10 msecs */
92 #define CONF_CARRIER_TIMEOUT 120000 /* Wait for carrier timeout */
93 
94 /* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */
95 #define CONF_OPEN_RETRIES 2 /* (Re)open devices twice */
96 #define CONF_SEND_RETRIES 6 /* Send six requests per open */
97 #define CONF_INTER_TIMEOUT (HZ/2) /* Inter-device timeout: 1/2 second */
98 #define CONF_BASE_TIMEOUT (HZ*2) /* Initial timeout: 2 seconds */
99 #define CONF_TIMEOUT_RANDOM (HZ) /* Maximum amount of randomization */
100 #define CONF_TIMEOUT_MULT *7/4 /* Rate of timeout growth */
101 #define CONF_TIMEOUT_MAX (HZ*30) /* Maximum allowed timeout */
102 #define CONF_NAMESERVERS_MAX 3 /* Maximum number of nameservers
103  - '3' from resolv.h */
104 
105 #define NONE cpu_to_be32(INADDR_NONE)
106 #define ANY cpu_to_be32(INADDR_ANY)
107 
108 /*
109  * Public IP configuration
110  */
111 
112 /* This is used by platforms which might be able to set the ipconfig
113  * variables using firmware environment vars. If this is set, it will
114  * ignore such firmware variables.
115  */
116 int ic_set_manually __initdata = 0; /* IPconfig parameters set manually */
117 
118 static int ic_enable __initdata = 0; /* IP config enabled? */
119 
120 /* Protocol choice */
121 int ic_proto_enabled __initdata = 0
122 #ifdef IPCONFIG_BOOTP
123  | IC_BOOTP
124 #endif
125 #ifdef CONFIG_IP_PNP_DHCP
126  | IC_USE_DHCP
127 #endif
128 #ifdef IPCONFIG_RARP
129  | IC_RARP
130 #endif
131  ;
132 
133 static int ic_host_name_set __initdata = 0; /* Host name set by us? */
134 
135 __be32 ic_myaddr = NONE; /* My IP address */
136 static __be32 ic_netmask = NONE; /* Netmask for local subnet */
137 __be32 ic_gateway = NONE; /* Gateway IP address */
138 
139 __be32 ic_servaddr = NONE; /* Boot server IP address */
140 
141 __be32 root_server_addr = NONE; /* Address of NFS server */
142 u8 root_server_path[256] = { 0, }; /* Path to mount as root */
143 
144 __be32 ic_dev_xid; /* Device under configuration */
145 
146 /* vendor class identifier */
147 static char vendor_class_identifier[253] __initdata;
148 
149 /* Persistent data: */
150 
151 static int ic_proto_used; /* Protocol used, if any */
152 static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */
153 static u8 ic_domain[64]; /* DNS (not NIS) domain name */
154 
155 /*
156  * Private state.
157  */
158 
159 /* Name of user-selected boot device */
160 static char user_dev_name[IFNAMSIZ] __initdata = { 0, };
161 
162 /* Protocols supported by available interfaces */
163 static int ic_proto_have_if __initdata = 0;
164 
165 /* MTU for boot device */
166 static int ic_dev_mtu __initdata = 0;
167 
168 #ifdef IPCONFIG_DYNAMIC
169 static DEFINE_SPINLOCK(ic_recv_lock);
170 static volatile int ic_got_reply __initdata = 0; /* Proto(s) that replied */
171 #endif
172 #ifdef IPCONFIG_DHCP
173 static int ic_dhcp_msgtype __initdata = 0; /* DHCP msg type received */
174 #endif
175 
176 
177 /*
178  * Network devices
179  */
180 
181 struct ic_device {
182  struct ic_device *next;
183  struct net_device *dev;
184  unsigned short flags;
185  short able;
186  __be32 xid;
187 };
188 
189 static struct ic_device *ic_first_dev __initdata = NULL;/* List of open device */
190 static struct net_device *ic_dev __initdata = NULL; /* Selected device */
191 
192 static bool __init ic_is_init_dev(struct net_device *dev)
193 {
194  if (dev->flags & IFF_LOOPBACK)
195  return false;
196  return user_dev_name[0] ? !strcmp(dev->name, user_dev_name) :
197  (!(dev->flags & IFF_LOOPBACK) &&
198  (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) &&
199  strncmp(dev->name, "dummy", 5));
200 }
201 
202 static int __init ic_open_devs(void)
203 {
204  struct ic_device *d, **last;
205  struct net_device *dev;
206  unsigned short oflags;
207  unsigned long start;
208 
209  last = &ic_first_dev;
210  rtnl_lock();
211 
212  /* bring loopback device up first */
213  for_each_netdev(&init_net, dev) {
214  if (!(dev->flags & IFF_LOOPBACK))
215  continue;
216  if (dev_change_flags(dev, dev->flags | IFF_UP) < 0)
217  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  while (jiffies - start < msecs_to_jiffies(CONF_CARRIER_TIMEOUT)) {
265  for_each_netdev(&init_net, dev)
266  if (ic_is_init_dev(dev) && netif_carrier_ok(dev))
267  goto have_carrier;
268 
269  msleep(1);
270  }
271 have_carrier:
272  rtnl_unlock();
273 
274  *last = NULL;
275 
276  if (!ic_first_dev) {
277  if (user_dev_name[0])
278  pr_err("IP-Config: Device `%s' not found\n",
279  user_dev_name);
280  else
281  pr_err("IP-Config: No network devices available\n");
282  return -ENODEV;
283  }
284  return 0;
285 }
286 
287 static void __init ic_close_devs(void)
288 {
289  struct ic_device *d, *next;
290  struct net_device *dev;
291 
292  rtnl_lock();
293  next = ic_first_dev;
294  while ((d = next)) {
295  next = d->next;
296  dev = d->dev;
297  if (dev != ic_dev) {
298  DBG(("IP-Config: Downing %s\n", dev->name));
299  dev_change_flags(dev, d->flags);
300  }
301  kfree(d);
302  }
303  rtnl_unlock();
304 }
305 
306 /*
307  * Interface to various network functions.
308  */
309 
310 static inline void
311 set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port)
312 {
313  sin->sin_family = AF_INET;
314  sin->sin_addr.s_addr = addr;
315  sin->sin_port = port;
316 }
317 
318 static int __init ic_devinet_ioctl(unsigned int cmd, struct ifreq *arg)
319 {
320  int res;
321 
322  mm_segment_t oldfs = get_fs();
323  set_fs(get_ds());
324  res = devinet_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
325  set_fs(oldfs);
326  return res;
327 }
328 
329 static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg)
330 {
331  int res;
332 
333  mm_segment_t oldfs = get_fs();
334  set_fs(get_ds());
335  res = dev_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
336  set_fs(oldfs);
337  return res;
338 }
339 
340 static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg)
341 {
342  int res;
343 
344  mm_segment_t oldfs = get_fs();
345  set_fs(get_ds());
346  res = ip_rt_ioctl(&init_net, cmd, (void __user *) arg);
347  set_fs(oldfs);
348  return res;
349 }
350 
351 /*
352  * Set up interface addresses and routes.
353  */
354 
355 static int __init ic_setup_if(void)
356 {
357  struct ifreq ir;
358  struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr;
359  int err;
360 
361  memset(&ir, 0, sizeof(ir));
362  strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name);
363  set_sockaddr(sin, ic_myaddr, 0);
364  if ((err = ic_devinet_ioctl(SIOCSIFADDR, &ir)) < 0) {
365  pr_err("IP-Config: Unable to set interface address (%d)\n",
366  err);
367  return -1;
368  }
369  set_sockaddr(sin, ic_netmask, 0);
370  if ((err = ic_devinet_ioctl(SIOCSIFNETMASK, &ir)) < 0) {
371  pr_err("IP-Config: Unable to set interface netmask (%d)\n",
372  err);
373  return -1;
374  }
375  set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0);
376  if ((err = ic_devinet_ioctl(SIOCSIFBRDADDR, &ir)) < 0) {
377  pr_err("IP-Config: Unable to set interface broadcast address (%d)\n",
378  err);
379  return -1;
380  }
381  /* Handle the case where we need non-standard MTU on the boot link (a network
382  * using jumbo frames, for instance). If we can't set the mtu, don't error
383  * out, we'll try to muddle along.
384  */
385  if (ic_dev_mtu != 0) {
386  strcpy(ir.ifr_name, ic_dev->name);
387  ir.ifr_mtu = ic_dev_mtu;
388  if ((err = ic_dev_ioctl(SIOCSIFMTU, &ir)) < 0)
389  pr_err("IP-Config: Unable to set interface mtu to %d (%d)\n",
390  ic_dev_mtu, err);
391  }
392  return 0;
393 }
394 
395 static int __init ic_setup_routes(void)
396 {
397  /* No need to setup device routes, only the default route... */
398 
399  if (ic_gateway != NONE) {
400  struct rtentry rm;
401  int err;
402 
403  memset(&rm, 0, sizeof(rm));
404  if ((ic_gateway ^ ic_myaddr) & ic_netmask) {
405  pr_err("IP-Config: Gateway not on directly connected network\n");
406  return -1;
407  }
408  set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0);
409  set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0);
410  set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0);
411  rm.rt_flags = RTF_UP | RTF_GATEWAY;
412  if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) {
413  pr_err("IP-Config: Cannot add default route (%d)\n",
414  err);
415  return -1;
416  }
417  }
418 
419  return 0;
420 }
421 
422 /*
423  * Fill in default values for all missing parameters.
424  */
425 
426 static int __init ic_defaults(void)
427 {
428  /*
429  * At this point we have no userspace running so need not
430  * claim locks on system_utsname
431  */
432 
433  if (!ic_host_name_set)
434  sprintf(init_utsname()->nodename, "%pI4", &ic_myaddr);
435 
436  if (root_server_addr == NONE)
437  root_server_addr = ic_servaddr;
438 
439  if (ic_netmask == NONE) {
440  if (IN_CLASSA(ntohl(ic_myaddr)))
441  ic_netmask = htonl(IN_CLASSA_NET);
442  else if (IN_CLASSB(ntohl(ic_myaddr)))
443  ic_netmask = htonl(IN_CLASSB_NET);
444  else if (IN_CLASSC(ntohl(ic_myaddr)))
445  ic_netmask = htonl(IN_CLASSC_NET);
446  else {
447  pr_err("IP-Config: Unable to guess netmask for address %pI4\n",
448  &ic_myaddr);
449  return -1;
450  }
451  printk("IP-Config: Guessing netmask %pI4\n", &ic_netmask);
452  }
453 
454  return 0;
455 }
456 
457 /*
458  * RARP support.
459  */
460 
461 #ifdef IPCONFIG_RARP
462 
463 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
464 
465 static struct packet_type rarp_packet_type __initdata = {
466  .type = cpu_to_be16(ETH_P_RARP),
467  .func = ic_rarp_recv,
468 };
469 
470 static inline void __init ic_rarp_init(void)
471 {
472  dev_add_pack(&rarp_packet_type);
473 }
474 
475 static inline void __init ic_rarp_cleanup(void)
476 {
477  dev_remove_pack(&rarp_packet_type);
478 }
479 
480 /*
481  * Process received RARP packet.
482  */
483 static int __init
484 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
485 {
486  struct arphdr *rarp;
487  unsigned char *rarp_ptr;
488  __be32 sip, tip;
489  unsigned char *sha, *tha; /* s for "source", t for "target" */
490  struct ic_device *d;
491 
492  if (!net_eq(dev_net(dev), &init_net))
493  goto drop;
494 
495  if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
496  return NET_RX_DROP;
497 
498  if (!pskb_may_pull(skb, sizeof(struct arphdr)))
499  goto drop;
500 
501  /* Basic sanity checks can be done without the lock. */
502  rarp = (struct arphdr *)skb_transport_header(skb);
503 
504  /* If this test doesn't pass, it's not IP, or we should
505  * ignore it anyway.
506  */
507  if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd))
508  goto drop;
509 
510  /* If it's not a RARP reply, delete it. */
511  if (rarp->ar_op != htons(ARPOP_RREPLY))
512  goto drop;
513 
514  /* If it's not Ethernet, delete it. */
515  if (rarp->ar_pro != htons(ETH_P_IP))
516  goto drop;
517 
518  if (!pskb_may_pull(skb, arp_hdr_len(dev)))
519  goto drop;
520 
521  /* OK, it is all there and looks valid, process... */
522  rarp = (struct arphdr *)skb_transport_header(skb);
523  rarp_ptr = (unsigned char *) (rarp + 1);
524 
525  /* One reply at a time, please. */
526  spin_lock(&ic_recv_lock);
527 
528  /* If we already have a reply, just drop the packet */
529  if (ic_got_reply)
530  goto drop_unlock;
531 
532  /* Find the ic_device that the packet arrived on */
533  d = ic_first_dev;
534  while (d && d->dev != dev)
535  d = d->next;
536  if (!d)
537  goto drop_unlock; /* should never happen */
538 
539  /* Extract variable-width fields */
540  sha = rarp_ptr;
541  rarp_ptr += dev->addr_len;
542  memcpy(&sip, rarp_ptr, 4);
543  rarp_ptr += 4;
544  tha = rarp_ptr;
545  rarp_ptr += dev->addr_len;
546  memcpy(&tip, rarp_ptr, 4);
547 
548  /* Discard packets which are not meant for us. */
549  if (memcmp(tha, dev->dev_addr, dev->addr_len))
550  goto drop_unlock;
551 
552  /* Discard packets which are not from specified server. */
553  if (ic_servaddr != NONE && ic_servaddr != sip)
554  goto drop_unlock;
555 
556  /* We have a winner! */
557  ic_dev = dev;
558  if (ic_myaddr == NONE)
559  ic_myaddr = tip;
560  ic_servaddr = sip;
561  ic_got_reply = IC_RARP;
562 
563 drop_unlock:
564  /* Show's over. Nothing to see here. */
565  spin_unlock(&ic_recv_lock);
566 
567 drop:
568  /* Throw the packet out. */
569  kfree_skb(skb);
570  return 0;
571 }
572 
573 
574 /*
575  * Send RARP request packet over a single interface.
576  */
577 static void __init ic_rarp_send_if(struct ic_device *d)
578 {
579  struct net_device *dev = d->dev;
580  arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL,
581  dev->dev_addr, dev->dev_addr);
582 }
583 #endif
584 
585 /*
586  * Predefine Nameservers
587  */
588 static inline void __init ic_nameservers_predef(void)
589 {
590  int i;
591 
592  for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
593  ic_nameservers[i] = NONE;
594 }
595 
596 /*
597  * DHCP/BOOTP support.
598  */
599 
600 #ifdef IPCONFIG_BOOTP
601 
602 struct bootp_pkt { /* BOOTP packet format */
603  struct iphdr iph; /* IP header */
604  struct udphdr udph; /* UDP header */
605  u8 op; /* 1=request, 2=reply */
606  u8 htype; /* HW address type */
607  u8 hlen; /* HW address length */
608  u8 hops; /* Used only by gateways */
609  __be32 xid; /* Transaction ID */
610  __be16 secs; /* Seconds since we started */
611  __be16 flags; /* Just what it says */
612  __be32 client_ip; /* Client's IP address if known */
613  __be32 your_ip; /* Assigned IP address */
614  __be32 server_ip; /* (Next, e.g. NFS) Server's IP address */
615  __be32 relay_ip; /* IP address of BOOTP relay */
616  u8 hw_addr[16]; /* Client's HW address */
617  u8 serv_name[64]; /* Server host name */
618  u8 boot_file[128]; /* Name of boot file */
619  u8 exten[312]; /* DHCP options / BOOTP vendor extensions */
620 };
621 
622 /* packet ops */
623 #define BOOTP_REQUEST 1
624 #define BOOTP_REPLY 2
625 
626 /* DHCP message types */
627 #define DHCPDISCOVER 1
628 #define DHCPOFFER 2
629 #define DHCPREQUEST 3
630 #define DHCPDECLINE 4
631 #define DHCPACK 5
632 #define DHCPNAK 6
633 #define DHCPRELEASE 7
634 #define DHCPINFORM 8
635 
636 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
637 
638 static struct packet_type bootp_packet_type __initdata = {
639  .type = cpu_to_be16(ETH_P_IP),
640  .func = ic_bootp_recv,
641 };
642 
643 
644 /*
645  * Initialize DHCP/BOOTP extension fields in the request.
646  */
647 
648 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 };
649 
650 #ifdef IPCONFIG_DHCP
651 
652 static void __init
653 ic_dhcp_init_options(u8 *options)
654 {
655  u8 mt = ((ic_servaddr == NONE)
656  ? DHCPDISCOVER : DHCPREQUEST);
657  u8 *e = options;
658  int len;
659 
660 #ifdef IPCONFIG_DEBUG
661  printk("DHCP: Sending message type %d\n", mt);
662 #endif
663 
664  memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */
665  e += 4;
666 
667  *e++ = 53; /* DHCP message type */
668  *e++ = 1;
669  *e++ = mt;
670 
671  if (mt == DHCPREQUEST) {
672  *e++ = 54; /* Server ID (IP address) */
673  *e++ = 4;
674  memcpy(e, &ic_servaddr, 4);
675  e += 4;
676 
677  *e++ = 50; /* Requested IP address */
678  *e++ = 4;
679  memcpy(e, &ic_myaddr, 4);
680  e += 4;
681  }
682 
683  /* always? */
684  {
685  static const u8 ic_req_params[] = {
686  1, /* Subnet mask */
687  3, /* Default gateway */
688  6, /* DNS server */
689  12, /* Host name */
690  15, /* Domain name */
691  17, /* Boot path */
692  26, /* MTU */
693  40, /* NIS domain name */
694  };
695 
696  *e++ = 55; /* Parameter request list */
697  *e++ = sizeof(ic_req_params);
698  memcpy(e, ic_req_params, sizeof(ic_req_params));
699  e += sizeof(ic_req_params);
700 
701  if (ic_host_name_set) {
702  *e++ = 12; /* host-name */
703  len = strlen(utsname()->nodename);
704  *e++ = len;
705  memcpy(e, utsname()->nodename, len);
706  e += len;
707  }
708  if (*vendor_class_identifier) {
709  pr_info("DHCP: sending class identifier \"%s\"\n",
710  vendor_class_identifier);
711  *e++ = 60; /* Class-identifier */
712  len = strlen(vendor_class_identifier);
713  *e++ = len;
714  memcpy(e, vendor_class_identifier, len);
715  e += len;
716  }
717  }
718 
719  *e++ = 255; /* End of the list */
720 }
721 
722 #endif /* IPCONFIG_DHCP */
723 
724 static void __init ic_bootp_init_ext(u8 *e)
725 {
726  memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */
727  e += 4;
728  *e++ = 1; /* Subnet mask request */
729  *e++ = 4;
730  e += 4;
731  *e++ = 3; /* Default gateway request */
732  *e++ = 4;
733  e += 4;
734  *e++ = 5; /* Name server request */
735  *e++ = 8;
736  e += 8;
737  *e++ = 12; /* Host name request */
738  *e++ = 32;
739  e += 32;
740  *e++ = 40; /* NIS Domain name request */
741  *e++ = 32;
742  e += 32;
743  *e++ = 17; /* Boot path */
744  *e++ = 40;
745  e += 40;
746 
747  *e++ = 57; /* set extension buffer size for reply */
748  *e++ = 2;
749  *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */
750  *e++ = 150;
751 
752  *e++ = 255; /* End of the list */
753 }
754 
755 
756 /*
757  * Initialize the DHCP/BOOTP mechanism.
758  */
759 static inline void __init ic_bootp_init(void)
760 {
761  ic_nameservers_predef();
762 
763  dev_add_pack(&bootp_packet_type);
764 }
765 
766 
767 /*
768  * DHCP/BOOTP cleanup.
769  */
770 static inline void __init ic_bootp_cleanup(void)
771 {
772  dev_remove_pack(&bootp_packet_type);
773 }
774 
775 
776 /*
777  * Send DHCP/BOOTP request to single interface.
778  */
779 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff)
780 {
781  struct net_device *dev = d->dev;
782  struct sk_buff *skb;
783  struct bootp_pkt *b;
784  struct iphdr *h;
785  int hlen = LL_RESERVED_SPACE(dev);
786  int tlen = dev->needed_tailroom;
787 
788  /* Allocate packet */
789  skb = alloc_skb(sizeof(struct bootp_pkt) + hlen + tlen + 15,
790  GFP_KERNEL);
791  if (!skb)
792  return;
793  skb_reserve(skb, hlen);
794  b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt));
795  memset(b, 0, sizeof(struct bootp_pkt));
796 
797  /* Construct IP header */
798  skb_reset_network_header(skb);
799  h = ip_hdr(skb);
800  h->version = 4;
801  h->ihl = 5;
802  h->tot_len = htons(sizeof(struct bootp_pkt));
803  h->frag_off = htons(IP_DF);
804  h->ttl = 64;
805  h->protocol = IPPROTO_UDP;
806  h->daddr = htonl(INADDR_BROADCAST);
807  h->check = ip_fast_csum((unsigned char *) h, h->ihl);
808 
809  /* Construct UDP header */
810  b->udph.source = htons(68);
811  b->udph.dest = htons(67);
812  b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr));
813  /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */
814 
815  /* Construct DHCP/BOOTP header */
816  b->op = BOOTP_REQUEST;
817  if (dev->type < 256) /* check for false types */
818  b->htype = dev->type;
819  else if (dev->type == ARPHRD_FDDI)
820  b->htype = ARPHRD_ETHER;
821  else {
822  printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name);
823  b->htype = dev->type; /* can cause undefined behavior */
824  }
825 
826  /* server_ip and your_ip address are both already zero per RFC2131 */
827  b->hlen = dev->addr_len;
828  memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
829  b->secs = htons(jiffies_diff / HZ);
830  b->xid = d->xid;
831 
832  /* add DHCP options or BOOTP extensions */
833 #ifdef IPCONFIG_DHCP
834  if (ic_proto_enabled & IC_USE_DHCP)
835  ic_dhcp_init_options(b->exten);
836  else
837 #endif
838  ic_bootp_init_ext(b->exten);
839 
840  /* Chain packet down the line... */
841  skb->dev = dev;
842  skb->protocol = htons(ETH_P_IP);
843  if (dev_hard_header(skb, dev, ntohs(skb->protocol),
844  dev->broadcast, dev->dev_addr, skb->len) < 0) {
845  kfree_skb(skb);
846  printk("E");
847  return;
848  }
849 
850  if (dev_queue_xmit(skb) < 0)
851  printk("E");
852 }
853 
854 
855 /*
856  * Copy BOOTP-supplied string if not already set.
857  */
858 static int __init ic_bootp_string(char *dest, char *src, int len, int max)
859 {
860  if (!len)
861  return 0;
862  if (len > max-1)
863  len = max-1;
864  memcpy(dest, src, len);
865  dest[len] = '\0';
866  return 1;
867 }
868 
869 
870 /*
871  * Process BOOTP extensions.
872  */
873 static void __init ic_do_bootp_ext(u8 *ext)
874 {
875  u8 servers;
876  int i;
877  __be16 mtu;
878 
879 #ifdef IPCONFIG_DEBUG
880  u8 *c;
881 
882  printk("DHCP/BOOTP: Got extension %d:",*ext);
883  for (c=ext+2; c<ext+2+ext[1]; c++)
884  printk(" %02x", *c);
885  printk("\n");
886 #endif
887 
888  switch (*ext++) {
889  case 1: /* Subnet mask */
890  if (ic_netmask == NONE)
891  memcpy(&ic_netmask, ext+1, 4);
892  break;
893  case 3: /* Default gateway */
894  if (ic_gateway == NONE)
895  memcpy(&ic_gateway, ext+1, 4);
896  break;
897  case 6: /* DNS server */
898  servers= *ext/4;
899  if (servers > CONF_NAMESERVERS_MAX)
900  servers = CONF_NAMESERVERS_MAX;
901  for (i = 0; i < servers; i++) {
902  if (ic_nameservers[i] == NONE)
903  memcpy(&ic_nameservers[i], ext+1+4*i, 4);
904  }
905  break;
906  case 12: /* Host name */
907  ic_bootp_string(utsname()->nodename, ext+1, *ext,
908  __NEW_UTS_LEN);
909  ic_host_name_set = 1;
910  break;
911  case 15: /* Domain name (DNS) */
912  ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
913  break;
914  case 17: /* Root path */
915  if (!root_server_path[0])
916  ic_bootp_string(root_server_path, ext+1, *ext,
917  sizeof(root_server_path));
918  break;
919  case 26: /* Interface MTU */
920  memcpy(&mtu, ext+1, sizeof(mtu));
921  ic_dev_mtu = ntohs(mtu);
922  break;
923  case 40: /* NIS Domain name (_not_ DNS) */
924  ic_bootp_string(utsname()->domainname, ext+1, *ext,
925  __NEW_UTS_LEN);
926  break;
927  }
928 }
929 
930 
931 /*
932  * Receive BOOTP reply.
933  */
934 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
935 {
936  struct bootp_pkt *b;
937  struct iphdr *h;
938  struct ic_device *d;
939  int len, ext_len;
940 
941  if (!net_eq(dev_net(dev), &init_net))
942  goto drop;
943 
944  /* Perform verifications before taking the lock. */
945  if (skb->pkt_type == PACKET_OTHERHOST)
946  goto drop;
947 
948  if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
949  return NET_RX_DROP;
950 
951  if (!pskb_may_pull(skb,
952  sizeof(struct iphdr) +
953  sizeof(struct udphdr)))
954  goto drop;
955 
956  b = (struct bootp_pkt *)skb_network_header(skb);
957  h = &b->iph;
958 
959  if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP)
960  goto drop;
961 
962  /* Fragments are not supported */
963  if (ip_is_fragment(h)) {
964  net_err_ratelimited("DHCP/BOOTP: Ignoring fragmented reply\n");
965  goto drop;
966  }
967 
968  if (skb->len < ntohs(h->tot_len))
969  goto drop;
970 
971  if (ip_fast_csum((char *) h, h->ihl))
972  goto drop;
973 
974  if (b->udph.source != htons(67) || b->udph.dest != htons(68))
975  goto drop;
976 
977  if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
978  goto drop;
979 
980  len = ntohs(b->udph.len) - sizeof(struct udphdr);
981  ext_len = len - (sizeof(*b) -
982  sizeof(struct iphdr) -
983  sizeof(struct udphdr) -
984  sizeof(b->exten));
985  if (ext_len < 0)
986  goto drop;
987 
988  /* Ok the front looks good, make sure we can get at the rest. */
989  if (!pskb_may_pull(skb, skb->len))
990  goto drop;
991 
992  b = (struct bootp_pkt *)skb_network_header(skb);
993  h = &b->iph;
994 
995  /* One reply at a time, please. */
996  spin_lock(&ic_recv_lock);
997 
998  /* If we already have a reply, just drop the packet */
999  if (ic_got_reply)
1000  goto drop_unlock;
1001 
1002  /* Find the ic_device that the packet arrived on */
1003  d = ic_first_dev;
1004  while (d && d->dev != dev)
1005  d = d->next;
1006  if (!d)
1007  goto drop_unlock; /* should never happen */
1008 
1009  /* Is it a reply to our BOOTP request? */
1010  if (b->op != BOOTP_REPLY ||
1011  b->xid != d->xid) {
1012  net_err_ratelimited("DHCP/BOOTP: Reply not for us, op[%x] xid[%x]\n",
1013  b->op, b->xid);
1014  goto drop_unlock;
1015  }
1016 
1017  /* Is it a reply for the device we are configuring? */
1018  if (b->xid != ic_dev_xid) {
1019  net_err_ratelimited("DHCP/BOOTP: Ignoring delayed packet\n");
1020  goto drop_unlock;
1021  }
1022 
1023  /* Parse extensions */
1024  if (ext_len >= 4 &&
1025  !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */
1026  u8 *end = (u8 *) b + ntohs(b->iph.tot_len);
1027  u8 *ext;
1028 
1029 #ifdef IPCONFIG_DHCP
1030  if (ic_proto_enabled & IC_USE_DHCP) {
1031  __be32 server_id = NONE;
1032  int mt = 0;
1033 
1034  ext = &b->exten[4];
1035  while (ext < end && *ext != 0xff) {
1036  u8 *opt = ext++;
1037  if (*opt == 0) /* Padding */
1038  continue;
1039  ext += *ext + 1;
1040  if (ext >= end)
1041  break;
1042  switch (*opt) {
1043  case 53: /* Message type */
1044  if (opt[1])
1045  mt = opt[2];
1046  break;
1047  case 54: /* Server ID (IP address) */
1048  if (opt[1] >= 4)
1049  memcpy(&server_id, opt + 2, 4);
1050  break;
1051  }
1052  }
1053 
1054 #ifdef IPCONFIG_DEBUG
1055  printk("DHCP: Got message type %d\n", mt);
1056 #endif
1057 
1058  switch (mt) {
1059  case DHCPOFFER:
1060  /* While in the process of accepting one offer,
1061  * ignore all others.
1062  */
1063  if (ic_myaddr != NONE)
1064  goto drop_unlock;
1065 
1066  /* Let's accept that offer. */
1067  ic_myaddr = b->your_ip;
1068  ic_servaddr = server_id;
1069 #ifdef IPCONFIG_DEBUG
1070  printk("DHCP: Offered address %pI4 by server %pI4\n",
1071  &ic_myaddr, &ic_servaddr);
1072 #endif
1073  /* The DHCP indicated server address takes
1074  * precedence over the bootp header one if
1075  * they are different.
1076  */
1077  if ((server_id != NONE) &&
1078  (b->server_ip != server_id))
1079  b->server_ip = ic_servaddr;
1080  break;
1081 
1082  case DHCPACK:
1083  if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0)
1084  goto drop_unlock;
1085 
1086  /* Yeah! */
1087  break;
1088 
1089  default:
1090  /* Urque. Forget it*/
1091  ic_myaddr = NONE;
1092  ic_servaddr = NONE;
1093  goto drop_unlock;
1094  }
1095 
1096  ic_dhcp_msgtype = mt;
1097 
1098  }
1099 #endif /* IPCONFIG_DHCP */
1100 
1101  ext = &b->exten[4];
1102  while (ext < end && *ext != 0xff) {
1103  u8 *opt = ext++;
1104  if (*opt == 0) /* Padding */
1105  continue;
1106  ext += *ext + 1;
1107  if (ext < end)
1108  ic_do_bootp_ext(opt);
1109  }
1110  }
1111 
1112  /* We have a winner! */
1113  ic_dev = dev;
1114  ic_myaddr = b->your_ip;
1115  ic_servaddr = b->server_ip;
1116  if (ic_gateway == NONE && b->relay_ip)
1117  ic_gateway = b->relay_ip;
1118  if (ic_nameservers[0] == NONE)
1119  ic_nameservers[0] = ic_servaddr;
1120  ic_got_reply = IC_BOOTP;
1121 
1122 drop_unlock:
1123  /* Show's over. Nothing to see here. */
1124  spin_unlock(&ic_recv_lock);
1125 
1126 drop:
1127  /* Throw the packet out. */
1128  kfree_skb(skb);
1129 
1130  return 0;
1131 }
1132 
1133 
1134 #endif
1135 
1136 
1137 /*
1138  * Dynamic IP configuration -- DHCP, BOOTP, RARP.
1139  */
1140 
1141 #ifdef IPCONFIG_DYNAMIC
1142 
1143 static int __init ic_dynamic(void)
1144 {
1145  int retries;
1146  struct ic_device *d;
1147  unsigned long start_jiffies, timeout, jiff;
1148  int do_bootp = ic_proto_have_if & IC_BOOTP;
1149  int do_rarp = ic_proto_have_if & IC_RARP;
1150 
1151  /*
1152  * If none of DHCP/BOOTP/RARP was selected, return with an error.
1153  * This routine gets only called when some pieces of information
1154  * are missing, and without DHCP/BOOTP/RARP we are unable to get it.
1155  */
1156  if (!ic_proto_enabled) {
1157  pr_err("IP-Config: Incomplete network configuration information\n");
1158  return -1;
1159  }
1160 
1161 #ifdef IPCONFIG_BOOTP
1162  if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
1163  pr_err("DHCP/BOOTP: No suitable device found\n");
1164 #endif
1165 #ifdef IPCONFIG_RARP
1166  if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)
1167  pr_err("RARP: No suitable device found\n");
1168 #endif
1169 
1170  if (!ic_proto_have_if)
1171  /* Error message already printed */
1172  return -1;
1173 
1174  /*
1175  * Setup protocols
1176  */
1177 #ifdef IPCONFIG_BOOTP
1178  if (do_bootp)
1179  ic_bootp_init();
1180 #endif
1181 #ifdef IPCONFIG_RARP
1182  if (do_rarp)
1183  ic_rarp_init();
1184 #endif
1185 
1186  /*
1187  * Send requests and wait, until we get an answer. This loop
1188  * seems to be a terrible waste of CPU time, but actually there is
1189  * only one process running at all, so we don't need to use any
1190  * scheduler functions.
1191  * [Actually we could now, but the nothing else running note still
1192  * applies.. - AC]
1193  */
1194  pr_notice("Sending %s%s%s requests .",
1195  do_bootp
1196  ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "",
1197  (do_bootp && do_rarp) ? " and " : "",
1198  do_rarp ? "RARP" : "");
1199 
1200  start_jiffies = jiffies;
1201  d = ic_first_dev;
1202  retries = CONF_SEND_RETRIES;
1203  get_random_bytes(&timeout, sizeof(timeout));
1204  timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned int) CONF_TIMEOUT_RANDOM);
1205  for (;;) {
1206  /* Track the device we are configuring */
1207  ic_dev_xid = d->xid;
1208 
1209 #ifdef IPCONFIG_BOOTP
1210  if (do_bootp && (d->able & IC_BOOTP))
1211  ic_bootp_send_if(d, jiffies - start_jiffies);
1212 #endif
1213 #ifdef IPCONFIG_RARP
1214  if (do_rarp && (d->able & IC_RARP))
1215  ic_rarp_send_if(d);
1216 #endif
1217 
1218  jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout);
1219  while (time_before(jiffies, jiff) && !ic_got_reply)
1220  schedule_timeout_uninterruptible(1);
1221 #ifdef IPCONFIG_DHCP
1222  /* DHCP isn't done until we get a DHCPACK. */
1223  if ((ic_got_reply & IC_BOOTP) &&
1224  (ic_proto_enabled & IC_USE_DHCP) &&
1225  ic_dhcp_msgtype != DHCPACK) {
1226  ic_got_reply = 0;
1227  pr_cont(",");
1228  continue;
1229  }
1230 #endif /* IPCONFIG_DHCP */
1231 
1232  if (ic_got_reply) {
1233  pr_cont(" OK\n");
1234  break;
1235  }
1236 
1237  if ((d = d->next))
1238  continue;
1239 
1240  if (! --retries) {
1241  pr_cont(" timed out!\n");
1242  break;
1243  }
1244 
1245  d = ic_first_dev;
1246 
1247  timeout = timeout CONF_TIMEOUT_MULT;
1248  if (timeout > CONF_TIMEOUT_MAX)
1249  timeout = CONF_TIMEOUT_MAX;
1250 
1251  pr_cont(".");
1252  }
1253 
1254 #ifdef IPCONFIG_BOOTP
1255  if (do_bootp)
1256  ic_bootp_cleanup();
1257 #endif
1258 #ifdef IPCONFIG_RARP
1259  if (do_rarp)
1260  ic_rarp_cleanup();
1261 #endif
1262 
1263  if (!ic_got_reply) {
1264  ic_myaddr = NONE;
1265  return -1;
1266  }
1267 
1268  printk("IP-Config: Got %s answer from %pI4, ",
1269  ((ic_got_reply & IC_RARP) ? "RARP"
1270  : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),
1271  &ic_servaddr);
1272  pr_cont("my address is %pI4\n", &ic_myaddr);
1273 
1274  return 0;
1275 }
1276 
1277 #endif /* IPCONFIG_DYNAMIC */
1278 
1279 #ifdef CONFIG_PROC_FS
1280 
1281 static int pnp_seq_show(struct seq_file *seq, void *v)
1282 {
1283  int i;
1284 
1285  if (ic_proto_used & IC_PROTO)
1286  seq_printf(seq, "#PROTO: %s\n",
1287  (ic_proto_used & IC_RARP) ? "RARP"
1288  : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP");
1289  else
1290  seq_puts(seq, "#MANUAL\n");
1291 
1292  if (ic_domain[0])
1293  seq_printf(seq,
1294  "domain %s\n", ic_domain);
1295  for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {
1296  if (ic_nameservers[i] != NONE)
1297  seq_printf(seq, "nameserver %pI4\n",
1298  &ic_nameservers[i]);
1299  }
1300  if (ic_servaddr != NONE)
1301  seq_printf(seq, "bootserver %pI4\n",
1302  &ic_servaddr);
1303  return 0;
1304 }
1305 
1306 static int pnp_seq_open(struct inode *indoe, struct file *file)
1307 {
1308  return single_open(file, pnp_seq_show, NULL);
1309 }
1310 
1311 static const struct file_operations pnp_seq_fops = {
1312  .owner = THIS_MODULE,
1313  .open = pnp_seq_open,
1314  .read = seq_read,
1315  .llseek = seq_lseek,
1316  .release = single_release,
1317 };
1318 #endif /* CONFIG_PROC_FS */
1319 
1320 /*
1321  * Extract IP address from the parameter string if needed. Note that we
1322  * need to have root_server_addr set _before_ IPConfig gets called as it
1323  * can override it.
1324  */
1325 __be32 __init root_nfs_parse_addr(char *name)
1326 {
1327  __be32 addr;
1328  int octets = 0;
1329  char *cp, *cq;
1330 
1331  cp = cq = name;
1332  while (octets < 4) {
1333  while (*cp >= '0' && *cp <= '9')
1334  cp++;
1335  if (cp == cq || cp - cq > 3)
1336  break;
1337  if (*cp == '.' || octets == 3)
1338  octets++;
1339  if (octets < 4)
1340  cp++;
1341  cq = cp;
1342  }
1343  if (octets == 4 && (*cp == ':' || *cp == '\0')) {
1344  if (*cp == ':')
1345  *cp++ = '\0';
1346  addr = in_aton(name);
1347  memmove(name, cp, strlen(cp) + 1);
1348  } else
1349  addr = NONE;
1350 
1351  return addr;
1352 }
1353 
1354 #define DEVICE_WAIT_MAX 12 /* 12 seconds */
1355 
1356 static int __init wait_for_devices(void)
1357 {
1358  int i;
1359 
1360  for (i = 0; i < DEVICE_WAIT_MAX; i++) {
1361  struct net_device *dev;
1362  int found = 0;
1363 
1364  rtnl_lock();
1365  for_each_netdev(&init_net, dev) {
1366  if (ic_is_init_dev(dev)) {
1367  found = 1;
1368  break;
1369  }
1370  }
1371  rtnl_unlock();
1372  if (found)
1373  return 0;
1374  ssleep(1);
1375  }
1376  return -ENODEV;
1377 }
1378 
1379 /*
1380  * IP Autoconfig dispatcher.
1381  */
1382 
1383 static int __init ip_auto_config(void)
1384 {
1385  __be32 addr;
1386 #ifdef IPCONFIG_DYNAMIC
1387  int retries = CONF_OPEN_RETRIES;
1388 #endif
1389  int err;
1390  unsigned int i;
1391 
1392 #ifdef CONFIG_PROC_FS
1393  proc_net_fops_create(&init_net, "pnp", S_IRUGO, &pnp_seq_fops);
1394 #endif /* CONFIG_PROC_FS */
1395 
1396  if (!ic_enable)
1397  return 0;
1398 
1399  DBG(("IP-Config: Entered.\n"));
1400 #ifdef IPCONFIG_DYNAMIC
1401  try_try_again:
1402 #endif
1403  /* Wait for devices to appear */
1404  err = wait_for_devices();
1405  if (err)
1406  return err;
1407 
1408  /* Setup all network devices */
1409  err = ic_open_devs();
1410  if (err)
1411  return err;
1412 
1413  /* Give drivers a chance to settle */
1414  msleep(CONF_POST_OPEN);
1415 
1416  /*
1417  * If the config information is insufficient (e.g., our IP address or
1418  * IP address of the boot server is missing or we have multiple network
1419  * interfaces and no default was set), use BOOTP or RARP to get the
1420  * missing values.
1421  */
1422  if (ic_myaddr == NONE ||
1423 #ifdef CONFIG_ROOT_NFS
1424  (root_server_addr == NONE &&
1425  ic_servaddr == NONE &&
1426  ROOT_DEV == Root_NFS) ||
1427 #endif
1428  ic_first_dev->next) {
1429 #ifdef IPCONFIG_DYNAMIC
1430  if (ic_dynamic() < 0) {
1431  ic_close_devs();
1432 
1433  /*
1434  * I don't know why, but sometimes the
1435  * eepro100 driver (at least) gets upset and
1436  * doesn't work the first time it's opened.
1437  * But then if you close it and reopen it, it
1438  * works just fine. So we need to try that at
1439  * least once before giving up.
1440  *
1441  * Also, if the root will be NFS-mounted, we
1442  * have nowhere to go if DHCP fails. So we
1443  * just have to keep trying forever.
1444  *
1445  * -- Chip
1446  */
1447 #ifdef CONFIG_ROOT_NFS
1448  if (ROOT_DEV == Root_NFS) {
1449  pr_err("IP-Config: Retrying forever (NFS root)...\n");
1450  goto try_try_again;
1451  }
1452 #endif
1453 
1454  if (--retries) {
1455  pr_err("IP-Config: Reopening network devices...\n");
1456  goto try_try_again;
1457  }
1458 
1459  /* Oh, well. At least we tried. */
1460  pr_err("IP-Config: Auto-configuration of network failed\n");
1461  return -1;
1462  }
1463 #else /* !DYNAMIC */
1464  pr_err("IP-Config: Incomplete network configuration information\n");
1465  ic_close_devs();
1466  return -1;
1467 #endif /* IPCONFIG_DYNAMIC */
1468  } else {
1469  /* Device selected manually or only one device -> use it */
1470  ic_dev = ic_first_dev->dev;
1471  }
1472 
1473  addr = root_nfs_parse_addr(root_server_path);
1474  if (root_server_addr == NONE)
1475  root_server_addr = addr;
1476 
1477  /*
1478  * Use defaults wherever applicable.
1479  */
1480  if (ic_defaults() < 0)
1481  return -1;
1482 
1483  /*
1484  * Close all network devices except the device we've
1485  * autoconfigured and set up routes.
1486  */
1487  ic_close_devs();
1488  if (ic_setup_if() < 0 || ic_setup_routes() < 0)
1489  return -1;
1490 
1491  /*
1492  * Record which protocol was actually used.
1493  */
1494 #ifdef IPCONFIG_DYNAMIC
1495  ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP);
1496 #endif
1497 
1498 #ifndef IPCONFIG_SILENT
1499  /*
1500  * Clue in the operator.
1501  */
1502  pr_info("IP-Config: Complete:\n");
1503  pr_info(" device=%s, addr=%pI4, mask=%pI4, gw=%pI4\n",
1504  ic_dev->name, &ic_myaddr, &ic_netmask, &ic_gateway);
1505  pr_info(" host=%s, domain=%s, nis-domain=%s\n",
1506  utsname()->nodename, ic_domain, utsname()->domainname);
1507  pr_info(" bootserver=%pI4, rootserver=%pI4, rootpath=%s",
1508  &ic_servaddr, &root_server_addr, root_server_path);
1509  if (ic_dev_mtu)
1510  pr_cont(", mtu=%d", ic_dev_mtu);
1511  for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
1512  if (ic_nameservers[i] != NONE) {
1513  pr_info(" nameserver%u=%pI4",
1514  i, &ic_nameservers[i]);
1515  break;
1516  }
1517  for (i++; i < CONF_NAMESERVERS_MAX; i++)
1518  if (ic_nameservers[i] != NONE)
1519  pr_cont(", nameserver%u=%pI4\n", i, &ic_nameservers[i]);
1520 #endif /* !SILENT */
1521 
1522  return 0;
1523 }
1524 
1525 late_initcall(ip_auto_config);
1526 
1527 
1528 /*
1529  * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
1530  * command line parameter. See Documentation/filesystems/nfs/nfsroot.txt.
1531  */
1532 static int __init ic_proto_name(char *name)
1533 {
1534  if (!strcmp(name, "on") || !strcmp(name, "any")) {
1535  return 1;
1536  }
1537  if (!strcmp(name, "off") || !strcmp(name, "none")) {
1538  return 0;
1539  }
1540 #ifdef CONFIG_IP_PNP_DHCP
1541  else if (!strcmp(name, "dhcp")) {
1542  ic_proto_enabled &= ~IC_RARP;
1543  return 1;
1544  }
1545 #endif
1546 #ifdef CONFIG_IP_PNP_BOOTP
1547  else if (!strcmp(name, "bootp")) {
1548  ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP);
1549  return 1;
1550  }
1551 #endif
1552 #ifdef CONFIG_IP_PNP_RARP
1553  else if (!strcmp(name, "rarp")) {
1554  ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP);
1555  return 1;
1556  }
1557 #endif
1558 #ifdef IPCONFIG_DYNAMIC
1559  else if (!strcmp(name, "both")) {
1560  ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */
1561  return 1;
1562  }
1563 #endif
1564  return 0;
1565 }
1566 
1567 static int __init ip_auto_config_setup(char *addrs)
1568 {
1569  char *cp, *ip, *dp;
1570  int num = 0;
1571 
1572  ic_set_manually = 1;
1573  ic_enable = 1;
1574 
1575  /*
1576  * If any dhcp, bootp etc options are set, leave autoconfig on
1577  * and skip the below static IP processing.
1578  */
1579  if (ic_proto_name(addrs))
1580  return 1;
1581 
1582  /* If no static IP is given, turn off autoconfig and bail. */
1583  if (*addrs == 0 ||
1584  strcmp(addrs, "off") == 0 ||
1585  strcmp(addrs, "none") == 0) {
1586  ic_enable = 0;
1587  return 1;
1588  }
1589 
1590  ic_nameservers_predef();
1591 
1592  /* Parse string for static IP assignment. */
1593  ip = addrs;
1594  while (ip && *ip) {
1595  if ((cp = strchr(ip, ':')))
1596  *cp++ = '\0';
1597  if (strlen(ip) > 0) {
1598  DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip));
1599  switch (num) {
1600  case 0:
1601  if ((ic_myaddr = in_aton(ip)) == ANY)
1602  ic_myaddr = NONE;
1603  break;
1604  case 1:
1605  if ((ic_servaddr = in_aton(ip)) == ANY)
1606  ic_servaddr = NONE;
1607  break;
1608  case 2:
1609  if ((ic_gateway = in_aton(ip)) == ANY)
1610  ic_gateway = NONE;
1611  break;
1612  case 3:
1613  if ((ic_netmask = in_aton(ip)) == ANY)
1614  ic_netmask = NONE;
1615  break;
1616  case 4:
1617  if ((dp = strchr(ip, '.'))) {
1618  *dp++ = '\0';
1619  strlcpy(utsname()->domainname, dp,
1620  sizeof(utsname()->domainname));
1621  }
1622  strlcpy(utsname()->nodename, ip,
1623  sizeof(utsname()->nodename));
1624  ic_host_name_set = 1;
1625  break;
1626  case 5:
1627  strlcpy(user_dev_name, ip, sizeof(user_dev_name));
1628  break;
1629  case 6:
1630  if (ic_proto_name(ip) == 0 &&
1631  ic_myaddr == NONE) {
1632  ic_enable = 0;
1633  }
1634  break;
1635  case 7:
1636  if (CONF_NAMESERVERS_MAX >= 1) {
1637  ic_nameservers[0] = in_aton(ip);
1638  if (ic_nameservers[0] == ANY)
1639  ic_nameservers[0] = NONE;
1640  }
1641  break;
1642  case 8:
1643  if (CONF_NAMESERVERS_MAX >= 2) {
1644  ic_nameservers[1] = in_aton(ip);
1645  if (ic_nameservers[1] == ANY)
1646  ic_nameservers[1] = NONE;
1647  }
1648  break;
1649  }
1650  }
1651  ip = cp;
1652  num++;
1653  }
1654 
1655  return 1;
1656 }
1657 __setup("ip=", ip_auto_config_setup);
1658 
1659 static int __init nfsaddrs_config_setup(char *addrs)
1660 {
1661  return ip_auto_config_setup(addrs);
1662 }
1663 __setup("nfsaddrs=", nfsaddrs_config_setup);
1664 
1665 static int __init vendor_class_identifier_setup(char *addrs)
1666 {
1667  if (strlcpy(vendor_class_identifier, addrs,
1668  sizeof(vendor_class_identifier))
1669  >= sizeof(vendor_class_identifier))
1670  pr_warn("DHCP: vendorclass too long, truncated to \"%s\"",
1671  vendor_class_identifier);
1672  return 1;
1673 }
1674 __setup("dhcpclass=", vendor_class_identifier_setup);
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