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TOMOYO Linux Cross Reference
Linux/net/ipv4/ipconfig.c

Version: ~ [ linux-5.4-rc7 ] ~ [ linux-5.3.11 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.84 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.154 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.201 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.201 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.77 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /*
  2  *  Automatic Configuration of IP -- use DHCP, BOOTP, RARP, or
  3  *  user-supplied information to configure own IP address and routes.
  4  *
  5  *  Copyright (C) 1996-1998 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
  6  *
  7  *  Derived from network configuration code in fs/nfs/nfsroot.c,
  8  *  originally Copyright (C) 1995, 1996 Gero Kuhlmann and me.
  9  *
 10  *  BOOTP rewritten to construct and analyse packets itself instead
 11  *  of misusing the IP layer. num_bugs_causing_wrong_arp_replies--;
 12  *                                           -- MJ, December 1998
 13  *
 14  *  Fixed ip_auto_config_setup calling at startup in the new "Linker Magic"
 15  *  initialization scheme.
 16  *      - Arnaldo Carvalho de Melo <acme@conectiva.com.br>, 08/11/1999
 17  *
 18  *  DHCP support added.  To users this looks like a whole separate
 19  *  protocol, but we know it's just a bag on the side of BOOTP.
 20  *              -- Chip Salzenberg <chip@valinux.com>, May 2000
 21  *
 22  *  Ported DHCP support from 2.2.16 to 2.4.0-test4
 23  *              -- Eric Biederman <ebiederman@lnxi.com>, 30 Aug 2000
 24  *
 25  *  Merged changes from 2.2.19 into 2.4.3
 26  *              -- Eric Biederman <ebiederman@lnxi.com>, 22 April Aug 2001
 27  *
 28  *  Multiple Nameservers in /proc/net/pnp
 29  *              --  Josef Siemes <jsiemes@web.de>, Aug 2002
 30  */
 31 
 32 #include <linux/types.h>
 33 #include <linux/string.h>
 34 #include <linux/kernel.h>
 35 #include <linux/jiffies.h>
 36 #include <linux/random.h>
 37 #include <linux/init.h>
 38 #include <linux/utsname.h>
 39 #include <linux/in.h>
 40 #include <linux/if.h>
 41 #include <linux/inet.h>
 42 #include <linux/inetdevice.h>
 43 #include <linux/netdevice.h>
 44 #include <linux/if_arp.h>
 45 #include <linux/skbuff.h>
 46 #include <linux/ip.h>
 47 #include <linux/socket.h>
 48 #include <linux/route.h>
 49 #include <linux/udp.h>
 50 #include <linux/proc_fs.h>
 51 #include <linux/seq_file.h>
 52 #include <linux/major.h>
 53 #include <linux/root_dev.h>
 54 #include <linux/delay.h>
 55 #include <linux/nfs_fs.h>
 56 #include <linux/slab.h>
 57 #include <linux/export.h>
 58 #include <net/net_namespace.h>
 59 #include <net/arp.h>
 60 #include <net/ip.h>
 61 #include <net/ipconfig.h>
 62 #include <net/route.h>
 63 
 64 #include <asm/uaccess.h>
 65 #include <net/checksum.h>
 66 #include <asm/processor.h>
 67 
 68 /* Define this to allow debugging output */
 69 #undef IPCONFIG_DEBUG
 70 
 71 #ifdef IPCONFIG_DEBUG
 72 #define DBG(x) printk x
 73 #else
 74 #define DBG(x) do { } while(0)
 75 #endif
 76 
 77 #if defined(CONFIG_IP_PNP_DHCP)
 78 #define IPCONFIG_DHCP
 79 #endif
 80 #if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_DHCP)
 81 #define IPCONFIG_BOOTP
 82 #endif
 83 #if defined(CONFIG_IP_PNP_RARP)
 84 #define IPCONFIG_RARP
 85 #endif
 86 #if defined(IPCONFIG_BOOTP) || defined(IPCONFIG_RARP)
 87 #define IPCONFIG_DYNAMIC
 88 #endif
 89 
 90 /* Define the friendly delay before and after opening net devices */
 91 #define CONF_POST_OPEN          10      /* After opening: 10 msecs */
 92 #define CONF_CARRIER_TIMEOUT    120000  /* Wait for carrier timeout */
 93 
 94 /* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */
 95 #define CONF_OPEN_RETRIES       2       /* (Re)open devices twice */
 96 #define CONF_SEND_RETRIES       6       /* Send six requests per open */
 97 #define CONF_INTER_TIMEOUT      (HZ/2)  /* Inter-device timeout: 1/2 second */
 98 #define CONF_BASE_TIMEOUT       (HZ*2)  /* Initial timeout: 2 seconds */
 99 #define CONF_TIMEOUT_RANDOM     (HZ)    /* Maximum amount of randomization */
100 #define CONF_TIMEOUT_MULT       *7/4    /* Rate of timeout growth */
101 #define CONF_TIMEOUT_MAX        (HZ*30) /* Maximum allowed timeout */
102 #define CONF_NAMESERVERS_MAX   3       /* Maximum number of nameservers
103                                            - '3' from resolv.h */
104 
105 #define NONE cpu_to_be32(INADDR_NONE)
106 #define ANY cpu_to_be32(INADDR_ANY)
107 
108 /*
109  * Public IP configuration
110  */
111 
112 /* This is used by platforms which might be able to set the ipconfig
113  * variables using firmware environment vars.  If this is set, it will
114  * ignore such firmware variables.
115  */
116 int ic_set_manually __initdata = 0;             /* IPconfig parameters set manually */
117 
118 static int ic_enable __initdata = 0;            /* IP config enabled? */
119 
120 /* Protocol choice */
121 int ic_proto_enabled __initdata = 0
122 #ifdef IPCONFIG_BOOTP
123                         | IC_BOOTP
124 #endif
125 #ifdef CONFIG_IP_PNP_DHCP
126                         | IC_USE_DHCP
127 #endif
128 #ifdef IPCONFIG_RARP
129                         | IC_RARP
130 #endif
131                         ;
132 
133 static int ic_host_name_set __initdata = 0;     /* Host name set by us? */
134 
135 __be32 ic_myaddr = NONE;                /* My IP address */
136 static __be32 ic_netmask = NONE;        /* Netmask for local subnet */
137 __be32 ic_gateway = NONE;       /* Gateway IP address */
138 
139 __be32 ic_addrservaddr = NONE;  /* IP Address of the IP addresses'server */
140 
141 __be32 ic_servaddr = NONE;      /* Boot server IP address */
142 
143 __be32 root_server_addr = NONE; /* Address of NFS server */
144 u8 root_server_path[256] = { 0, };      /* Path to mount as root */
145 
146 __be32 ic_dev_xid;              /* Device under configuration */
147 
148 /* vendor class identifier */
149 static char vendor_class_identifier[253] __initdata;
150 
151 /* Persistent data: */
152 
153 static int ic_proto_used;                       /* Protocol used, if any */
154 static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */
155 static u8 ic_domain[64];                /* DNS (not NIS) domain name */
156 
157 /*
158  * Private state.
159  */
160 
161 /* Name of user-selected boot device */
162 static char user_dev_name[IFNAMSIZ] __initdata = { 0, };
163 
164 /* Protocols supported by available interfaces */
165 static int ic_proto_have_if __initdata = 0;
166 
167 /* MTU for boot device */
168 static int ic_dev_mtu __initdata = 0;
169 
170 #ifdef IPCONFIG_DYNAMIC
171 static DEFINE_SPINLOCK(ic_recv_lock);
172 static volatile int ic_got_reply __initdata = 0;    /* Proto(s) that replied */
173 #endif
174 #ifdef IPCONFIG_DHCP
175 static int ic_dhcp_msgtype __initdata = 0;      /* DHCP msg type received */
176 #endif
177 
178 
179 /*
180  *      Network devices
181  */
182 
183 struct ic_device {
184         struct ic_device *next;
185         struct net_device *dev;
186         unsigned short flags;
187         short able;
188         __be32 xid;
189 };
190 
191 static struct ic_device *ic_first_dev __initdata = NULL;/* List of open device */
192 static struct net_device *ic_dev __initdata = NULL;     /* Selected device */
193 
194 static bool __init ic_is_init_dev(struct net_device *dev)
195 {
196         if (dev->flags & IFF_LOOPBACK)
197                 return false;
198         return user_dev_name[0] ? !strcmp(dev->name, user_dev_name) :
199             (!(dev->flags & IFF_LOOPBACK) &&
200              (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) &&
201              strncmp(dev->name, "dummy", 5));
202 }
203 
204 static int __init ic_open_devs(void)
205 {
206         struct ic_device *d, **last;
207         struct net_device *dev;
208         unsigned short oflags;
209         unsigned long start, next_msg;
210 
211         last = &ic_first_dev;
212         rtnl_lock();
213 
214         /* bring loopback device up first */
215         for_each_netdev(&init_net, dev) {
216                 if (!(dev->flags & IFF_LOOPBACK))
217                         continue;
218                 if (dev_change_flags(dev, dev->flags | IFF_UP) < 0)
219                         pr_err("IP-Config: Failed to open %s\n", dev->name);
220         }
221 
222         for_each_netdev(&init_net, dev) {
223                 if (ic_is_init_dev(dev)) {
224                         int able = 0;
225                         if (dev->mtu >= 364)
226                                 able |= IC_BOOTP;
227                         else
228                                 pr_warn("DHCP/BOOTP: Ignoring device %s, MTU %d too small",
229                                         dev->name, dev->mtu);
230                         if (!(dev->flags & IFF_NOARP))
231                                 able |= IC_RARP;
232                         able &= ic_proto_enabled;
233                         if (ic_proto_enabled && !able)
234                                 continue;
235                         oflags = dev->flags;
236                         if (dev_change_flags(dev, oflags | IFF_UP) < 0) {
237                                 pr_err("IP-Config: Failed to open %s\n",
238                                        dev->name);
239                                 continue;
240                         }
241                         if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) {
242                                 rtnl_unlock();
243                                 return -ENOMEM;
244                         }
245                         d->dev = dev;
246                         *last = d;
247                         last = &d->next;
248                         d->flags = oflags;
249                         d->able = able;
250                         if (able & IC_BOOTP)
251                                 get_random_bytes(&d->xid, sizeof(__be32));
252                         else
253                                 d->xid = 0;
254                         ic_proto_have_if |= able;
255                         DBG(("IP-Config: %s UP (able=%d, xid=%08x)\n",
256                                 dev->name, able, d->xid));
257                 }
258         }
259 
260         /* no point in waiting if we could not bring up at least one device */
261         if (!ic_first_dev)
262                 goto have_carrier;
263 
264         /* wait for a carrier on at least one device */
265         start = jiffies;
266         next_msg = start + msecs_to_jiffies(CONF_CARRIER_TIMEOUT/12);
267         while (jiffies - start < msecs_to_jiffies(CONF_CARRIER_TIMEOUT)) {
268                 int wait, elapsed;
269 
270                 for_each_netdev(&init_net, dev)
271                         if (ic_is_init_dev(dev) && netif_carrier_ok(dev))
272                                 goto have_carrier;
273 
274                 msleep(1);
275 
276                 if time_before(jiffies, next_msg)
277                         continue;
278 
279                 elapsed = jiffies_to_msecs(jiffies - start);
280                 wait = (CONF_CARRIER_TIMEOUT - elapsed + 500)/1000;
281                 pr_info("Waiting up to %d more seconds for network.\n", wait);
282                 next_msg = jiffies + msecs_to_jiffies(CONF_CARRIER_TIMEOUT/12);
283         }
284 have_carrier:
285         rtnl_unlock();
286 
287         *last = NULL;
288 
289         if (!ic_first_dev) {
290                 if (user_dev_name[0])
291                         pr_err("IP-Config: Device `%s' not found\n",
292                                user_dev_name);
293                 else
294                         pr_err("IP-Config: No network devices available\n");
295                 return -ENODEV;
296         }
297         return 0;
298 }
299 
300 static void __init ic_close_devs(void)
301 {
302         struct ic_device *d, *next;
303         struct net_device *dev;
304 
305         rtnl_lock();
306         next = ic_first_dev;
307         while ((d = next)) {
308                 next = d->next;
309                 dev = d->dev;
310                 if (dev != ic_dev) {
311                         DBG(("IP-Config: Downing %s\n", dev->name));
312                         dev_change_flags(dev, d->flags);
313                 }
314                 kfree(d);
315         }
316         rtnl_unlock();
317 }
318 
319 /*
320  *      Interface to various network functions.
321  */
322 
323 static inline void
324 set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port)
325 {
326         sin->sin_family = AF_INET;
327         sin->sin_addr.s_addr = addr;
328         sin->sin_port = port;
329 }
330 
331 static int __init ic_devinet_ioctl(unsigned int cmd, struct ifreq *arg)
332 {
333         int res;
334 
335         mm_segment_t oldfs = get_fs();
336         set_fs(get_ds());
337         res = devinet_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
338         set_fs(oldfs);
339         return res;
340 }
341 
342 static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg)
343 {
344         int res;
345 
346         mm_segment_t oldfs = get_fs();
347         set_fs(get_ds());
348         res = dev_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
349         set_fs(oldfs);
350         return res;
351 }
352 
353 static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg)
354 {
355         int res;
356 
357         mm_segment_t oldfs = get_fs();
358         set_fs(get_ds());
359         res = ip_rt_ioctl(&init_net, cmd, (void __user *) arg);
360         set_fs(oldfs);
361         return res;
362 }
363 
364 /*
365  *      Set up interface addresses and routes.
366  */
367 
368 static int __init ic_setup_if(void)
369 {
370         struct ifreq ir;
371         struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr;
372         int err;
373 
374         memset(&ir, 0, sizeof(ir));
375         strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name);
376         set_sockaddr(sin, ic_myaddr, 0);
377         if ((err = ic_devinet_ioctl(SIOCSIFADDR, &ir)) < 0) {
378                 pr_err("IP-Config: Unable to set interface address (%d)\n",
379                        err);
380                 return -1;
381         }
382         set_sockaddr(sin, ic_netmask, 0);
383         if ((err = ic_devinet_ioctl(SIOCSIFNETMASK, &ir)) < 0) {
384                 pr_err("IP-Config: Unable to set interface netmask (%d)\n",
385                        err);
386                 return -1;
387         }
388         set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0);
389         if ((err = ic_devinet_ioctl(SIOCSIFBRDADDR, &ir)) < 0) {
390                 pr_err("IP-Config: Unable to set interface broadcast address (%d)\n",
391                        err);
392                 return -1;
393         }
394         /* Handle the case where we need non-standard MTU on the boot link (a network
395          * using jumbo frames, for instance).  If we can't set the mtu, don't error
396          * out, we'll try to muddle along.
397          */
398         if (ic_dev_mtu != 0) {
399                 strcpy(ir.ifr_name, ic_dev->name);
400                 ir.ifr_mtu = ic_dev_mtu;
401                 if ((err = ic_dev_ioctl(SIOCSIFMTU, &ir)) < 0)
402                         pr_err("IP-Config: Unable to set interface mtu to %d (%d)\n",
403                                ic_dev_mtu, err);
404         }
405         return 0;
406 }
407 
408 static int __init ic_setup_routes(void)
409 {
410         /* No need to setup device routes, only the default route... */
411 
412         if (ic_gateway != NONE) {
413                 struct rtentry rm;
414                 int err;
415 
416                 memset(&rm, 0, sizeof(rm));
417                 if ((ic_gateway ^ ic_myaddr) & ic_netmask) {
418                         pr_err("IP-Config: Gateway not on directly connected network\n");
419                         return -1;
420                 }
421                 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0);
422                 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0);
423                 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0);
424                 rm.rt_flags = RTF_UP | RTF_GATEWAY;
425                 if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) {
426                         pr_err("IP-Config: Cannot add default route (%d)\n",
427                                err);
428                         return -1;
429                 }
430         }
431 
432         return 0;
433 }
434 
435 /*
436  *      Fill in default values for all missing parameters.
437  */
438 
439 static int __init ic_defaults(void)
440 {
441         /*
442          *      At this point we have no userspace running so need not
443          *      claim locks on system_utsname
444          */
445 
446         if (!ic_host_name_set)
447                 sprintf(init_utsname()->nodename, "%pI4", &ic_myaddr);
448 
449         if (root_server_addr == NONE)
450                 root_server_addr = ic_servaddr;
451 
452         if (ic_netmask == NONE) {
453                 if (IN_CLASSA(ntohl(ic_myaddr)))
454                         ic_netmask = htonl(IN_CLASSA_NET);
455                 else if (IN_CLASSB(ntohl(ic_myaddr)))
456                         ic_netmask = htonl(IN_CLASSB_NET);
457                 else if (IN_CLASSC(ntohl(ic_myaddr)))
458                         ic_netmask = htonl(IN_CLASSC_NET);
459                 else {
460                         pr_err("IP-Config: Unable to guess netmask for address %pI4\n",
461                                &ic_myaddr);
462                         return -1;
463                 }
464                 printk("IP-Config: Guessing netmask %pI4\n", &ic_netmask);
465         }
466 
467         return 0;
468 }
469 
470 /*
471  *      RARP support.
472  */
473 
474 #ifdef IPCONFIG_RARP
475 
476 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
477 
478 static struct packet_type rarp_packet_type __initdata = {
479         .type = cpu_to_be16(ETH_P_RARP),
480         .func = ic_rarp_recv,
481 };
482 
483 static inline void __init ic_rarp_init(void)
484 {
485         dev_add_pack(&rarp_packet_type);
486 }
487 
488 static inline void __init ic_rarp_cleanup(void)
489 {
490         dev_remove_pack(&rarp_packet_type);
491 }
492 
493 /*
494  *  Process received RARP packet.
495  */
496 static int __init
497 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
498 {
499         struct arphdr *rarp;
500         unsigned char *rarp_ptr;
501         __be32 sip, tip;
502         unsigned char *sha, *tha;               /* s for "source", t for "target" */
503         struct ic_device *d;
504 
505         if (!net_eq(dev_net(dev), &init_net))
506                 goto drop;
507 
508         if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
509                 return NET_RX_DROP;
510 
511         if (!pskb_may_pull(skb, sizeof(struct arphdr)))
512                 goto drop;
513 
514         /* Basic sanity checks can be done without the lock.  */
515         rarp = (struct arphdr *)skb_transport_header(skb);
516 
517         /* If this test doesn't pass, it's not IP, or we should
518          * ignore it anyway.
519          */
520         if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd))
521                 goto drop;
522 
523         /* If it's not a RARP reply, delete it. */
524         if (rarp->ar_op != htons(ARPOP_RREPLY))
525                 goto drop;
526 
527         /* If it's not Ethernet, delete it. */
528         if (rarp->ar_pro != htons(ETH_P_IP))
529                 goto drop;
530 
531         if (!pskb_may_pull(skb, arp_hdr_len(dev)))
532                 goto drop;
533 
534         /* OK, it is all there and looks valid, process... */
535         rarp = (struct arphdr *)skb_transport_header(skb);
536         rarp_ptr = (unsigned char *) (rarp + 1);
537 
538         /* One reply at a time, please. */
539         spin_lock(&ic_recv_lock);
540 
541         /* If we already have a reply, just drop the packet */
542         if (ic_got_reply)
543                 goto drop_unlock;
544 
545         /* Find the ic_device that the packet arrived on */
546         d = ic_first_dev;
547         while (d && d->dev != dev)
548                 d = d->next;
549         if (!d)
550                 goto drop_unlock;       /* should never happen */
551 
552         /* Extract variable-width fields */
553         sha = rarp_ptr;
554         rarp_ptr += dev->addr_len;
555         memcpy(&sip, rarp_ptr, 4);
556         rarp_ptr += 4;
557         tha = rarp_ptr;
558         rarp_ptr += dev->addr_len;
559         memcpy(&tip, rarp_ptr, 4);
560 
561         /* Discard packets which are not meant for us. */
562         if (memcmp(tha, dev->dev_addr, dev->addr_len))
563                 goto drop_unlock;
564 
565         /* Discard packets which are not from specified server. */
566         if (ic_servaddr != NONE && ic_servaddr != sip)
567                 goto drop_unlock;
568 
569         /* We have a winner! */
570         ic_dev = dev;
571         if (ic_myaddr == NONE)
572                 ic_myaddr = tip;
573         ic_servaddr = sip;
574         ic_addrservaddr = sip;
575         ic_got_reply = IC_RARP;
576 
577 drop_unlock:
578         /* Show's over.  Nothing to see here.  */
579         spin_unlock(&ic_recv_lock);
580 
581 drop:
582         /* Throw the packet out. */
583         kfree_skb(skb);
584         return 0;
585 }
586 
587 
588 /*
589  *  Send RARP request packet over a single interface.
590  */
591 static void __init ic_rarp_send_if(struct ic_device *d)
592 {
593         struct net_device *dev = d->dev;
594         arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL,
595                  dev->dev_addr, dev->dev_addr);
596 }
597 #endif
598 
599 /*
600  *  Predefine Nameservers
601  */
602 static inline void __init ic_nameservers_predef(void)
603 {
604         int i;
605 
606         for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
607                 ic_nameservers[i] = NONE;
608 }
609 
610 /*
611  *      DHCP/BOOTP support.
612  */
613 
614 #ifdef IPCONFIG_BOOTP
615 
616 struct bootp_pkt {              /* BOOTP packet format */
617         struct iphdr iph;       /* IP header */
618         struct udphdr udph;     /* UDP header */
619         u8 op;                  /* 1=request, 2=reply */
620         u8 htype;               /* HW address type */
621         u8 hlen;                /* HW address length */
622         u8 hops;                /* Used only by gateways */
623         __be32 xid;             /* Transaction ID */
624         __be16 secs;            /* Seconds since we started */
625         __be16 flags;           /* Just what it says */
626         __be32 client_ip;               /* Client's IP address if known */
627         __be32 your_ip;         /* Assigned IP address */
628         __be32 server_ip;               /* (Next, e.g. NFS) Server's IP address */
629         __be32 relay_ip;                /* IP address of BOOTP relay */
630         u8 hw_addr[16];         /* Client's HW address */
631         u8 serv_name[64];       /* Server host name */
632         u8 boot_file[128];      /* Name of boot file */
633         u8 exten[312];          /* DHCP options / BOOTP vendor extensions */
634 };
635 
636 /* packet ops */
637 #define BOOTP_REQUEST   1
638 #define BOOTP_REPLY     2
639 
640 /* DHCP message types */
641 #define DHCPDISCOVER    1
642 #define DHCPOFFER       2
643 #define DHCPREQUEST     3
644 #define DHCPDECLINE     4
645 #define DHCPACK         5
646 #define DHCPNAK         6
647 #define DHCPRELEASE     7
648 #define DHCPINFORM      8
649 
650 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
651 
652 static struct packet_type bootp_packet_type __initdata = {
653         .type = cpu_to_be16(ETH_P_IP),
654         .func = ic_bootp_recv,
655 };
656 
657 
658 /*
659  *  Initialize DHCP/BOOTP extension fields in the request.
660  */
661 
662 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 };
663 
664 #ifdef IPCONFIG_DHCP
665 
666 static void __init
667 ic_dhcp_init_options(u8 *options)
668 {
669         u8 mt = ((ic_servaddr == NONE)
670                  ? DHCPDISCOVER : DHCPREQUEST);
671         u8 *e = options;
672         int len;
673 
674 #ifdef IPCONFIG_DEBUG
675         printk("DHCP: Sending message type %d\n", mt);
676 #endif
677 
678         memcpy(e, ic_bootp_cookie, 4);  /* RFC1048 Magic Cookie */
679         e += 4;
680 
681         *e++ = 53;              /* DHCP message type */
682         *e++ = 1;
683         *e++ = mt;
684 
685         if (mt == DHCPREQUEST) {
686                 *e++ = 54;      /* Server ID (IP address) */
687                 *e++ = 4;
688                 memcpy(e, &ic_servaddr, 4);
689                 e += 4;
690 
691                 *e++ = 50;      /* Requested IP address */
692                 *e++ = 4;
693                 memcpy(e, &ic_myaddr, 4);
694                 e += 4;
695         }
696 
697         /* always? */
698         {
699                 static const u8 ic_req_params[] = {
700                         1,      /* Subnet mask */
701                         3,      /* Default gateway */
702                         6,      /* DNS server */
703                         12,     /* Host name */
704                         15,     /* Domain name */
705                         17,     /* Boot path */
706                         26,     /* MTU */
707                         40,     /* NIS domain name */
708                 };
709 
710                 *e++ = 55;      /* Parameter request list */
711                 *e++ = sizeof(ic_req_params);
712                 memcpy(e, ic_req_params, sizeof(ic_req_params));
713                 e += sizeof(ic_req_params);
714 
715                 if (ic_host_name_set) {
716                         *e++ = 12;      /* host-name */
717                         len = strlen(utsname()->nodename);
718                         *e++ = len;
719                         memcpy(e, utsname()->nodename, len);
720                         e += len;
721                 }
722                 if (*vendor_class_identifier) {
723                         pr_info("DHCP: sending class identifier \"%s\"\n",
724                                 vendor_class_identifier);
725                         *e++ = 60;      /* Class-identifier */
726                         len = strlen(vendor_class_identifier);
727                         *e++ = len;
728                         memcpy(e, vendor_class_identifier, len);
729                         e += len;
730                 }
731         }
732 
733         *e++ = 255;     /* End of the list */
734 }
735 
736 #endif /* IPCONFIG_DHCP */
737 
738 static void __init ic_bootp_init_ext(u8 *e)
739 {
740         memcpy(e, ic_bootp_cookie, 4);  /* RFC1048 Magic Cookie */
741         e += 4;
742         *e++ = 1;               /* Subnet mask request */
743         *e++ = 4;
744         e += 4;
745         *e++ = 3;               /* Default gateway request */
746         *e++ = 4;
747         e += 4;
748         *e++ = 5;               /* Name server request */
749         *e++ = 8;
750         e += 8;
751         *e++ = 12;              /* Host name request */
752         *e++ = 32;
753         e += 32;
754         *e++ = 40;              /* NIS Domain name request */
755         *e++ = 32;
756         e += 32;
757         *e++ = 17;              /* Boot path */
758         *e++ = 40;
759         e += 40;
760 
761         *e++ = 57;              /* set extension buffer size for reply */
762         *e++ = 2;
763         *e++ = 1;               /* 128+236+8+20+14, see dhcpd sources */
764         *e++ = 150;
765 
766         *e++ = 255;             /* End of the list */
767 }
768 
769 
770 /*
771  *  Initialize the DHCP/BOOTP mechanism.
772  */
773 static inline void __init ic_bootp_init(void)
774 {
775         ic_nameservers_predef();
776 
777         dev_add_pack(&bootp_packet_type);
778 }
779 
780 
781 /*
782  *  DHCP/BOOTP cleanup.
783  */
784 static inline void __init ic_bootp_cleanup(void)
785 {
786         dev_remove_pack(&bootp_packet_type);
787 }
788 
789 
790 /*
791  *  Send DHCP/BOOTP request to single interface.
792  */
793 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff)
794 {
795         struct net_device *dev = d->dev;
796         struct sk_buff *skb;
797         struct bootp_pkt *b;
798         struct iphdr *h;
799         int hlen = LL_RESERVED_SPACE(dev);
800         int tlen = dev->needed_tailroom;
801 
802         /* Allocate packet */
803         skb = alloc_skb(sizeof(struct bootp_pkt) + hlen + tlen + 15,
804                         GFP_KERNEL);
805         if (!skb)
806                 return;
807         skb_reserve(skb, hlen);
808         b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt));
809         memset(b, 0, sizeof(struct bootp_pkt));
810 
811         /* Construct IP header */
812         skb_reset_network_header(skb);
813         h = ip_hdr(skb);
814         h->version = 4;
815         h->ihl = 5;
816         h->tot_len = htons(sizeof(struct bootp_pkt));
817         h->frag_off = htons(IP_DF);
818         h->ttl = 64;
819         h->protocol = IPPROTO_UDP;
820         h->daddr = htonl(INADDR_BROADCAST);
821         h->check = ip_fast_csum((unsigned char *) h, h->ihl);
822 
823         /* Construct UDP header */
824         b->udph.source = htons(68);
825         b->udph.dest = htons(67);
826         b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr));
827         /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */
828 
829         /* Construct DHCP/BOOTP header */
830         b->op = BOOTP_REQUEST;
831         if (dev->type < 256) /* check for false types */
832                 b->htype = dev->type;
833         else if (dev->type == ARPHRD_FDDI)
834                 b->htype = ARPHRD_ETHER;
835         else {
836                 printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name);
837                 b->htype = dev->type; /* can cause undefined behavior */
838         }
839 
840         /* server_ip and your_ip address are both already zero per RFC2131 */
841         b->hlen = dev->addr_len;
842         memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
843         b->secs = htons(jiffies_diff / HZ);
844         b->xid = d->xid;
845 
846         /* add DHCP options or BOOTP extensions */
847 #ifdef IPCONFIG_DHCP
848         if (ic_proto_enabled & IC_USE_DHCP)
849                 ic_dhcp_init_options(b->exten);
850         else
851 #endif
852                 ic_bootp_init_ext(b->exten);
853 
854         /* Chain packet down the line... */
855         skb->dev = dev;
856         skb->protocol = htons(ETH_P_IP);
857         if (dev_hard_header(skb, dev, ntohs(skb->protocol),
858                             dev->broadcast, dev->dev_addr, skb->len) < 0) {
859                 kfree_skb(skb);
860                 printk("E");
861                 return;
862         }
863 
864         if (dev_queue_xmit(skb) < 0)
865                 printk("E");
866 }
867 
868 
869 /*
870  *  Copy BOOTP-supplied string if not already set.
871  */
872 static int __init ic_bootp_string(char *dest, char *src, int len, int max)
873 {
874         if (!len)
875                 return 0;
876         if (len > max-1)
877                 len = max-1;
878         memcpy(dest, src, len);
879         dest[len] = '\0';
880         return 1;
881 }
882 
883 
884 /*
885  *  Process BOOTP extensions.
886  */
887 static void __init ic_do_bootp_ext(u8 *ext)
888 {
889         u8 servers;
890         int i;
891         __be16 mtu;
892 
893 #ifdef IPCONFIG_DEBUG
894         u8 *c;
895 
896         printk("DHCP/BOOTP: Got extension %d:",*ext);
897         for (c=ext+2; c<ext+2+ext[1]; c++)
898                 printk(" %02x", *c);
899         printk("\n");
900 #endif
901 
902         switch (*ext++) {
903         case 1:         /* Subnet mask */
904                 if (ic_netmask == NONE)
905                         memcpy(&ic_netmask, ext+1, 4);
906                 break;
907         case 3:         /* Default gateway */
908                 if (ic_gateway == NONE)
909                         memcpy(&ic_gateway, ext+1, 4);
910                 break;
911         case 6:         /* DNS server */
912                 servers= *ext/4;
913                 if (servers > CONF_NAMESERVERS_MAX)
914                         servers = CONF_NAMESERVERS_MAX;
915                 for (i = 0; i < servers; i++) {
916                         if (ic_nameservers[i] == NONE)
917                                 memcpy(&ic_nameservers[i], ext+1+4*i, 4);
918                 }
919                 break;
920         case 12:        /* Host name */
921                 ic_bootp_string(utsname()->nodename, ext+1, *ext,
922                                 __NEW_UTS_LEN);
923                 ic_host_name_set = 1;
924                 break;
925         case 15:        /* Domain name (DNS) */
926                 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
927                 break;
928         case 17:        /* Root path */
929                 if (!root_server_path[0])
930                         ic_bootp_string(root_server_path, ext+1, *ext,
931                                         sizeof(root_server_path));
932                 break;
933         case 26:        /* Interface MTU */
934                 memcpy(&mtu, ext+1, sizeof(mtu));
935                 ic_dev_mtu = ntohs(mtu);
936                 break;
937         case 40:        /* NIS Domain name (_not_ DNS) */
938                 ic_bootp_string(utsname()->domainname, ext+1, *ext,
939                                 __NEW_UTS_LEN);
940                 break;
941         }
942 }
943 
944 
945 /*
946  *  Receive BOOTP reply.
947  */
948 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
949 {
950         struct bootp_pkt *b;
951         struct iphdr *h;
952         struct ic_device *d;
953         int len, ext_len;
954 
955         if (!net_eq(dev_net(dev), &init_net))
956                 goto drop;
957 
958         /* Perform verifications before taking the lock.  */
959         if (skb->pkt_type == PACKET_OTHERHOST)
960                 goto drop;
961 
962         if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
963                 return NET_RX_DROP;
964 
965         if (!pskb_may_pull(skb,
966                            sizeof(struct iphdr) +
967                            sizeof(struct udphdr)))
968                 goto drop;
969 
970         b = (struct bootp_pkt *)skb_network_header(skb);
971         h = &b->iph;
972 
973         if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP)
974                 goto drop;
975 
976         /* Fragments are not supported */
977         if (ip_is_fragment(h)) {
978                 net_err_ratelimited("DHCP/BOOTP: Ignoring fragmented reply\n");
979                 goto drop;
980         }
981 
982         if (skb->len < ntohs(h->tot_len))
983                 goto drop;
984 
985         if (ip_fast_csum((char *) h, h->ihl))
986                 goto drop;
987 
988         if (b->udph.source != htons(67) || b->udph.dest != htons(68))
989                 goto drop;
990 
991         if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
992                 goto drop;
993 
994         len = ntohs(b->udph.len) - sizeof(struct udphdr);
995         ext_len = len - (sizeof(*b) -
996                          sizeof(struct iphdr) -
997                          sizeof(struct udphdr) -
998                          sizeof(b->exten));
999         if (ext_len < 0)
1000                 goto drop;
1001 
1002         /* Ok the front looks good, make sure we can get at the rest.  */
1003         if (!pskb_may_pull(skb, skb->len))
1004                 goto drop;
1005 
1006         b = (struct bootp_pkt *)skb_network_header(skb);
1007         h = &b->iph;
1008 
1009         /* One reply at a time, please. */
1010         spin_lock(&ic_recv_lock);
1011 
1012         /* If we already have a reply, just drop the packet */
1013         if (ic_got_reply)
1014                 goto drop_unlock;
1015 
1016         /* Find the ic_device that the packet arrived on */
1017         d = ic_first_dev;
1018         while (d && d->dev != dev)
1019                 d = d->next;
1020         if (!d)
1021                 goto drop_unlock;  /* should never happen */
1022 
1023         /* Is it a reply to our BOOTP request? */
1024         if (b->op != BOOTP_REPLY ||
1025             b->xid != d->xid) {
1026                 net_err_ratelimited("DHCP/BOOTP: Reply not for us, op[%x] xid[%x]\n",
1027                                     b->op, b->xid);
1028                 goto drop_unlock;
1029         }
1030 
1031         /* Is it a reply for the device we are configuring? */
1032         if (b->xid != ic_dev_xid) {
1033                 net_err_ratelimited("DHCP/BOOTP: Ignoring delayed packet\n");
1034                 goto drop_unlock;
1035         }
1036 
1037         /* Parse extensions */
1038         if (ext_len >= 4 &&
1039             !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */
1040                 u8 *end = (u8 *) b + ntohs(b->iph.tot_len);
1041                 u8 *ext;
1042 
1043 #ifdef IPCONFIG_DHCP
1044                 if (ic_proto_enabled & IC_USE_DHCP) {
1045                         __be32 server_id = NONE;
1046                         int mt = 0;
1047 
1048                         ext = &b->exten[4];
1049                         while (ext < end && *ext != 0xff) {
1050                                 u8 *opt = ext++;
1051                                 if (*opt == 0)  /* Padding */
1052                                         continue;
1053                                 ext += *ext + 1;
1054                                 if (ext >= end)
1055                                         break;
1056                                 switch (*opt) {
1057                                 case 53:        /* Message type */
1058                                         if (opt[1])
1059                                                 mt = opt[2];
1060                                         break;
1061                                 case 54:        /* Server ID (IP address) */
1062                                         if (opt[1] >= 4)
1063                                                 memcpy(&server_id, opt + 2, 4);
1064                                         break;
1065                                 }
1066                         }
1067 
1068 #ifdef IPCONFIG_DEBUG
1069                         printk("DHCP: Got message type %d\n", mt);
1070 #endif
1071 
1072                         switch (mt) {
1073                         case DHCPOFFER:
1074                                 /* While in the process of accepting one offer,
1075                                  * ignore all others.
1076                                  */
1077                                 if (ic_myaddr != NONE)
1078                                         goto drop_unlock;
1079 
1080                                 /* Let's accept that offer. */
1081                                 ic_myaddr = b->your_ip;
1082                                 ic_servaddr = server_id;
1083 #ifdef IPCONFIG_DEBUG
1084                                 printk("DHCP: Offered address %pI4 by server %pI4\n",
1085                                        &ic_myaddr, &b->iph.saddr);
1086 #endif
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                 /* Track the device we are configuring */
1222                 ic_dev_xid = d->xid;
1223 
1224 #ifdef IPCONFIG_BOOTP
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         printk("IP-Config: Got %s answer from %pI4, ",
1284                 ((ic_got_reply & IC_RARP) ? "RARP"
1285                  : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),
1286                &ic_addrservaddr);
1287         pr_cont("my address is %pI4\n", &ic_myaddr);
1288 
1289         return 0;
1290 }
1291 
1292 #endif /* IPCONFIG_DYNAMIC */
1293 
1294 #ifdef CONFIG_PROC_FS
1295 
1296 static int pnp_seq_show(struct seq_file *seq, void *v)
1297 {
1298         int i;
1299 
1300         if (ic_proto_used & IC_PROTO)
1301                 seq_printf(seq, "#PROTO: %s\n",
1302                            (ic_proto_used & IC_RARP) ? "RARP"
1303                            : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP");
1304         else
1305                 seq_puts(seq, "#MANUAL\n");
1306 
1307         if (ic_domain[0])
1308                 seq_printf(seq,
1309                            "domain %s\n", ic_domain);
1310         for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {
1311                 if (ic_nameservers[i] != NONE)
1312                         seq_printf(seq, "nameserver %pI4\n",
1313                                    &ic_nameservers[i]);
1314         }
1315         if (ic_servaddr != NONE)
1316                 seq_printf(seq, "bootserver %pI4\n",
1317                            &ic_servaddr);
1318         return 0;
1319 }
1320 
1321 static int pnp_seq_open(struct inode *indoe, struct file *file)
1322 {
1323         return single_open(file, pnp_seq_show, NULL);
1324 }
1325 
1326 static const struct file_operations pnp_seq_fops = {
1327         .owner          = THIS_MODULE,
1328         .open           = pnp_seq_open,
1329         .read           = seq_read,
1330         .llseek         = seq_lseek,
1331         .release        = single_release,
1332 };
1333 #endif /* CONFIG_PROC_FS */
1334 
1335 /*
1336  *  Extract IP address from the parameter string if needed. Note that we
1337  *  need to have root_server_addr set _before_ IPConfig gets called as it
1338  *  can override it.
1339  */
1340 __be32 __init root_nfs_parse_addr(char *name)
1341 {
1342         __be32 addr;
1343         int octets = 0;
1344         char *cp, *cq;
1345 
1346         cp = cq = name;
1347         while (octets < 4) {
1348                 while (*cp >= '' && *cp <= '9')
1349                         cp++;
1350                 if (cp == cq || cp - cq > 3)
1351                         break;
1352                 if (*cp == '.' || octets == 3)
1353                         octets++;
1354                 if (octets < 4)
1355                         cp++;
1356                 cq = cp;
1357         }
1358         if (octets == 4 && (*cp == ':' || *cp == '\0')) {
1359                 if (*cp == ':')
1360                         *cp++ = '\0';
1361                 addr = in_aton(name);
1362                 memmove(name, cp, strlen(cp) + 1);
1363         } else
1364                 addr = NONE;
1365 
1366         return addr;
1367 }
1368 
1369 #define DEVICE_WAIT_MAX         12 /* 12 seconds */
1370 
1371 static int __init wait_for_devices(void)
1372 {
1373         int i;
1374 
1375         for (i = 0; i < DEVICE_WAIT_MAX; i++) {
1376                 struct net_device *dev;
1377                 int found = 0;
1378 
1379                 rtnl_lock();
1380                 for_each_netdev(&init_net, dev) {
1381                         if (ic_is_init_dev(dev)) {
1382                                 found = 1;
1383                                 break;
1384                         }
1385                 }
1386                 rtnl_unlock();
1387                 if (found)
1388                         return 0;
1389                 ssleep(1);
1390         }
1391         return -ENODEV;
1392 }
1393 
1394 /*
1395  *      IP Autoconfig dispatcher.
1396  */
1397 
1398 static int __init ip_auto_config(void)
1399 {
1400         __be32 addr;
1401 #ifdef IPCONFIG_DYNAMIC
1402         int retries = CONF_OPEN_RETRIES;
1403 #endif
1404         int err;
1405         unsigned int i;
1406 
1407 #ifdef CONFIG_PROC_FS
1408         proc_create("pnp", S_IRUGO, init_net.proc_net, &pnp_seq_fops);
1409 #endif /* CONFIG_PROC_FS */
1410 
1411         if (!ic_enable)
1412                 return 0;
1413 
1414         DBG(("IP-Config: Entered.\n"));
1415 #ifdef IPCONFIG_DYNAMIC
1416  try_try_again:
1417 #endif
1418         /* Wait for devices to appear */
1419         err = wait_for_devices();
1420         if (err)
1421                 return err;
1422 
1423         /* Setup all network devices */
1424         err = ic_open_devs();
1425         if (err)
1426                 return err;
1427 
1428         /* Give drivers a chance to settle */
1429         msleep(CONF_POST_OPEN);
1430 
1431         /*
1432          * If the config information is insufficient (e.g., our IP address or
1433          * IP address of the boot server is missing or we have multiple network
1434          * interfaces and no default was set), use BOOTP or RARP to get the
1435          * missing values.
1436          */
1437         if (ic_myaddr == NONE ||
1438 #ifdef CONFIG_ROOT_NFS
1439             (root_server_addr == NONE &&
1440              ic_servaddr == NONE &&
1441              ROOT_DEV == Root_NFS) ||
1442 #endif
1443             ic_first_dev->next) {
1444 #ifdef IPCONFIG_DYNAMIC
1445                 if (ic_dynamic() < 0) {
1446                         ic_close_devs();
1447 
1448                         /*
1449                          * I don't know why, but sometimes the
1450                          * eepro100 driver (at least) gets upset and
1451                          * doesn't work the first time it's opened.
1452                          * But then if you close it and reopen it, it
1453                          * works just fine.  So we need to try that at
1454                          * least once before giving up.
1455                          *
1456                          * Also, if the root will be NFS-mounted, we
1457                          * have nowhere to go if DHCP fails.  So we
1458                          * just have to keep trying forever.
1459                          *
1460                          *                              -- Chip
1461                          */
1462 #ifdef CONFIG_ROOT_NFS
1463                         if (ROOT_DEV ==  Root_NFS) {
1464                                 pr_err("IP-Config: Retrying forever (NFS root)...\n");
1465                                 goto try_try_again;
1466                         }
1467 #endif
1468 
1469                         if (--retries) {
1470                                 pr_err("IP-Config: Reopening network devices...\n");
1471                                 goto try_try_again;
1472                         }
1473 
1474                         /* Oh, well.  At least we tried. */
1475                         pr_err("IP-Config: Auto-configuration of network failed\n");
1476                         return -1;
1477                 }
1478 #else /* !DYNAMIC */
1479                 pr_err("IP-Config: Incomplete network configuration information\n");
1480                 ic_close_devs();
1481                 return -1;
1482 #endif /* IPCONFIG_DYNAMIC */
1483         } else {
1484                 /* Device selected manually or only one device -> use it */
1485                 ic_dev = ic_first_dev->dev;
1486         }
1487 
1488         addr = root_nfs_parse_addr(root_server_path);
1489         if (root_server_addr == NONE)
1490                 root_server_addr = addr;
1491 
1492         /*
1493          * Use defaults wherever applicable.
1494          */
1495         if (ic_defaults() < 0)
1496                 return -1;
1497 
1498         /*
1499          * Close all network devices except the device we've
1500          * autoconfigured and set up routes.
1501          */
1502         ic_close_devs();
1503         if (ic_setup_if() < 0 || ic_setup_routes() < 0)
1504                 return -1;
1505 
1506         /*
1507          * Record which protocol was actually used.
1508          */
1509 #ifdef IPCONFIG_DYNAMIC
1510         ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP);
1511 #endif
1512 
1513 #ifndef IPCONFIG_SILENT
1514         /*
1515          * Clue in the operator.
1516          */
1517         pr_info("IP-Config: Complete:\n");
1518 
1519         pr_info("     device=%s, hwaddr=%*phC, ipaddr=%pI4, mask=%pI4, gw=%pI4\n",
1520                 ic_dev->name, ic_dev->addr_len, ic_dev->dev_addr,
1521                 &ic_myaddr, &ic_netmask, &ic_gateway);
1522         pr_info("     host=%s, domain=%s, nis-domain=%s\n",
1523                 utsname()->nodename, ic_domain, utsname()->domainname);
1524         pr_info("     bootserver=%pI4, rootserver=%pI4, rootpath=%s",
1525                 &ic_servaddr, &root_server_addr, root_server_path);
1526         if (ic_dev_mtu)
1527                 pr_cont(", mtu=%d", ic_dev_mtu);
1528         for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
1529                 if (ic_nameservers[i] != NONE) {
1530                         pr_info("     nameserver%u=%pI4",
1531                                 i, &ic_nameservers[i]);
1532                         break;
1533                 }
1534         for (i++; i < CONF_NAMESERVERS_MAX; i++)
1535                 if (ic_nameservers[i] != NONE)
1536                         pr_cont(", nameserver%u=%pI4", i, &ic_nameservers[i]);
1537         pr_cont("\n");
1538 #endif /* !SILENT */
1539 
1540         return 0;
1541 }
1542 
1543 late_initcall(ip_auto_config);
1544 
1545 
1546 /*
1547  *  Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
1548  *  command line parameter.  See Documentation/filesystems/nfs/nfsroot.txt.
1549  */
1550 static int __init ic_proto_name(char *name)
1551 {
1552         if (!strcmp(name, "on") || !strcmp(name, "any")) {
1553                 return 1;
1554         }
1555         if (!strcmp(name, "off") || !strcmp(name, "none")) {
1556                 return 0;
1557         }
1558 #ifdef CONFIG_IP_PNP_DHCP
1559         else if (!strcmp(name, "dhcp")) {
1560                 ic_proto_enabled &= ~IC_RARP;
1561                 return 1;
1562         }
1563 #endif
1564 #ifdef CONFIG_IP_PNP_BOOTP
1565         else if (!strcmp(name, "bootp")) {
1566                 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP);
1567                 return 1;
1568         }
1569 #endif
1570 #ifdef CONFIG_IP_PNP_RARP
1571         else if (!strcmp(name, "rarp")) {
1572                 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP);
1573                 return 1;
1574         }
1575 #endif
1576 #ifdef IPCONFIG_DYNAMIC
1577         else if (!strcmp(name, "both")) {
1578                 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */
1579                 return 1;
1580         }
1581 #endif
1582         return 0;
1583 }
1584 
1585 static int __init ip_auto_config_setup(char *addrs)
1586 {
1587         char *cp, *ip, *dp;
1588         int num = 0;
1589 
1590         ic_set_manually = 1;
1591         ic_enable = 1;
1592 
1593         /*
1594          * If any dhcp, bootp etc options are set, leave autoconfig on
1595          * and skip the below static IP processing.
1596          */
1597         if (ic_proto_name(addrs))
1598                 return 1;
1599 
1600         /* If no static IP is given, turn off autoconfig and bail.  */
1601         if (*addrs == 0 ||
1602             strcmp(addrs, "off") == 0 ||
1603             strcmp(addrs, "none") == 0) {
1604                 ic_enable = 0;
1605                 return 1;
1606         }
1607 
1608         ic_nameservers_predef();
1609 
1610         /* Parse string for static IP assignment.  */
1611         ip = addrs;
1612         while (ip && *ip) {
1613                 if ((cp = strchr(ip, ':')))
1614                         *cp++ = '\0';
1615                 if (strlen(ip) > 0) {
1616                         DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip));
1617                         switch (num) {
1618                         case 0:
1619                                 if ((ic_myaddr = in_aton(ip)) == ANY)
1620                                         ic_myaddr = NONE;
1621                                 break;
1622                         case 1:
1623                                 if ((ic_servaddr = in_aton(ip)) == ANY)
1624                                         ic_servaddr = NONE;
1625                                 break;
1626                         case 2:
1627                                 if ((ic_gateway = in_aton(ip)) == ANY)
1628                                         ic_gateway = NONE;
1629                                 break;
1630                         case 3:
1631                                 if ((ic_netmask = in_aton(ip)) == ANY)
1632                                         ic_netmask = NONE;
1633                                 break;
1634                         case 4:
1635                                 if ((dp = strchr(ip, '.'))) {
1636                                         *dp++ = '\0';
1637                                         strlcpy(utsname()->domainname, dp,
1638                                                 sizeof(utsname()->domainname));
1639                                 }
1640                                 strlcpy(utsname()->nodename, ip,
1641                                         sizeof(utsname()->nodename));
1642                                 ic_host_name_set = 1;
1643                                 break;
1644                         case 5:
1645                                 strlcpy(user_dev_name, ip, sizeof(user_dev_name));
1646                                 break;
1647                         case 6:
1648                                 if (ic_proto_name(ip) == 0 &&
1649                                     ic_myaddr == NONE) {
1650                                         ic_enable = 0;
1651                                 }
1652                                 break;
1653                         case 7:
1654                                 if (CONF_NAMESERVERS_MAX >= 1) {
1655                                         ic_nameservers[0] = in_aton(ip);
1656                                         if (ic_nameservers[0] == ANY)
1657                                                 ic_nameservers[0] = NONE;
1658                                 }
1659                                 break;
1660                         case 8:
1661                                 if (CONF_NAMESERVERS_MAX >= 2) {
1662                                         ic_nameservers[1] = in_aton(ip);
1663                                         if (ic_nameservers[1] == ANY)
1664                                                 ic_nameservers[1] = NONE;
1665                                 }
1666                                 break;
1667                         }
1668                 }
1669                 ip = cp;
1670                 num++;
1671         }
1672 
1673         return 1;
1674 }
1675 __setup("ip=", ip_auto_config_setup);
1676 
1677 static int __init nfsaddrs_config_setup(char *addrs)
1678 {
1679         return ip_auto_config_setup(addrs);
1680 }
1681 __setup("nfsaddrs=", nfsaddrs_config_setup);
1682 
1683 static int __init vendor_class_identifier_setup(char *addrs)
1684 {
1685         if (strlcpy(vendor_class_identifier, addrs,
1686                     sizeof(vendor_class_identifier))
1687             >= sizeof(vendor_class_identifier))
1688                 pr_warn("DHCP: vendorclass too long, truncated to \"%s\"",
1689                         vendor_class_identifier);
1690         return 1;
1691 }
1692 __setup("dhcpclass=", vendor_class_identifier_setup);
1693 

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