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

Version: ~ [ linux-5.16 ] ~ [ linux-5.15.13 ] ~ [ linux-5.14.21 ] ~ [ linux-5.13.19 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.90 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.170 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.224 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.261 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.296 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.298 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
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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 <mj@atrey.karlin.mff.cuni.cz>
  6  *
  7  *  Derived from network configuration code in fs/nfs/nfsroot.c,
  8  *  originally Copyright (C) 1995, 1996 Gero Kuhlmann and me.
  9  *
 10  *  BOOTP rewritten to construct and analyse packets itself instead
 11  *  of misusing the IP layer. num_bugs_causing_wrong_arp_replies--;
 12  *                                           -- MJ, December 1998
 13  *
 14  *  Fixed ip_auto_config_setup calling at startup in the new "Linker Magic"
 15  *  initialization scheme.
 16  *      - Arnaldo Carvalho de Melo <acme@conectiva.com.br>, 08/11/1999
 17  *
 18  *  DHCP support added.  To users this looks like a whole separate
 19  *  protocol, but we know it's just a bag on the side of BOOTP.
 20  *              -- Chip Salzenberg <chip@valinux.com>, May 2000
 21  *
 22  *  Ported DHCP support from 2.2.16 to 2.4.0-test4
 23  *              -- Eric Biederman <ebiederman@lnxi.com>, 30 Aug 2000
 24  *
 25  *  Merged changes from 2.2.19 into 2.4.3
 26  *              -- Eric Biederman <ebiederman@lnxi.com>, 22 April Aug 2001
 27  *
 28  *  Multiple Nameservers in /proc/net/pnp
 29  *              --  Josef Siemes <jsiemes@web.de>, Aug 2002
 30  */
 31 
 32 #include <linux/types.h>
 33 #include <linux/string.h>
 34 #include <linux/kernel.h>
 35 #include <linux/jiffies.h>
 36 #include <linux/random.h>
 37 #include <linux/init.h>
 38 #include <linux/utsname.h>
 39 #include <linux/in.h>
 40 #include <linux/if.h>
 41 #include <linux/inet.h>
 42 #include <linux/inetdevice.h>
 43 #include <linux/netdevice.h>
 44 #include <linux/if_arp.h>
 45 #include <linux/skbuff.h>
 46 #include <linux/ip.h>
 47 #include <linux/socket.h>
 48 #include <linux/route.h>
 49 #include <linux/udp.h>
 50 #include <linux/proc_fs.h>
 51 #include <linux/seq_file.h>
 52 #include <linux/major.h>
 53 #include <linux/root_dev.h>
 54 #include <linux/delay.h>
 55 #include <linux/nfs_fs.h>
 56 #include <linux/slab.h>
 57 #include <linux/export.h>
 58 #include <net/net_namespace.h>
 59 #include <net/arp.h>
 60 #include <net/ip.h>
 61 #include <net/ipconfig.h>
 62 #include <net/route.h>
 63 
 64 #include <asm/uaccess.h>
 65 #include <net/checksum.h>
 66 #include <asm/processor.h>
 67 
 68 /* Define this to allow debugging output */
 69 #undef IPCONFIG_DEBUG
 70 
 71 #ifdef IPCONFIG_DEBUG
 72 #define DBG(x) printk x
 73 #else
 74 #define DBG(x) do { } while(0)
 75 #endif
 76 
 77 #if defined(CONFIG_IP_PNP_DHCP)
 78 #define IPCONFIG_DHCP
 79 #endif
 80 #if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_DHCP)
 81 #define IPCONFIG_BOOTP
 82 #endif
 83 #if defined(CONFIG_IP_PNP_RARP)
 84 #define IPCONFIG_RARP
 85 #endif
 86 #if defined(IPCONFIG_BOOTP) || defined(IPCONFIG_RARP)
 87 #define IPCONFIG_DYNAMIC
 88 #endif
 89 
 90 /* Define the friendly delay before and after opening net devices */
 91 #define CONF_POST_OPEN          10      /* After opening: 10 msecs */
 92 #define CONF_CARRIER_TIMEOUT    120000  /* Wait for carrier timeout */
 93 
 94 /* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */
 95 #define CONF_OPEN_RETRIES       2       /* (Re)open devices twice */
 96 #define CONF_SEND_RETRIES       6       /* Send six requests per open */
 97 #define CONF_INTER_TIMEOUT      (HZ/2)  /* Inter-device timeout: 1/2 second */
 98 #define CONF_BASE_TIMEOUT       (HZ*2)  /* Initial timeout: 2 seconds */
 99 #define CONF_TIMEOUT_RANDOM     (HZ)    /* Maximum amount of randomization */
100 #define CONF_TIMEOUT_MULT       *7/4    /* Rate of timeout growth */
101 #define CONF_TIMEOUT_MAX        (HZ*30) /* Maximum allowed timeout */
102 #define CONF_NAMESERVERS_MAX   3       /* Maximum number of nameservers
103                                            - '3' from resolv.h */
104 
105 #define NONE cpu_to_be32(INADDR_NONE)
106 #define ANY cpu_to_be32(INADDR_ANY)
107 
108 /*
109  * Public IP configuration
110  */
111 
112 /* This is used by platforms which might be able to set the ipconfig
113  * variables using firmware environment vars.  If this is set, it will
114  * ignore such firmware variables.
115  */
116 int ic_set_manually __initdata = 0;             /* IPconfig parameters set manually */
117 
118 static int ic_enable __initdata;                /* IP config enabled? */
119 
120 /* Protocol choice */
121 int ic_proto_enabled __initdata = 0
122 #ifdef IPCONFIG_BOOTP
123                         | IC_BOOTP
124 #endif
125 #ifdef CONFIG_IP_PNP_DHCP
126                         | IC_USE_DHCP
127 #endif
128 #ifdef IPCONFIG_RARP
129                         | IC_RARP
130 #endif
131                         ;
132 
133 static int ic_host_name_set __initdata; /* Host name set by us? */
134 
135 __be32 ic_myaddr = NONE;                /* My IP address */
136 static __be32 ic_netmask = NONE;        /* Netmask for local subnet */
137 __be32 ic_gateway = NONE;       /* Gateway IP address */
138 
139 __be32 ic_addrservaddr = NONE;  /* IP Address of the IP addresses'server */
140 
141 __be32 ic_servaddr = NONE;      /* Boot server IP address */
142 
143 __be32 root_server_addr = NONE; /* Address of NFS server */
144 u8 root_server_path[256] = { 0, };      /* Path to mount as root */
145 
146 /* vendor class identifier */
147 static char vendor_class_identifier[253] __initdata;
148 
149 /* Persistent data: */
150 
151 static int ic_proto_used;                       /* Protocol used, if any */
152 static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */
153 static u8 ic_domain[64];                /* DNS (not NIS) domain name */
154 
155 /*
156  * Private state.
157  */
158 
159 /* Name of user-selected boot device */
160 static char user_dev_name[IFNAMSIZ] __initdata = { 0, };
161 
162 /* Protocols supported by available interfaces */
163 static int ic_proto_have_if __initdata;
164 
165 /* MTU for boot device */
166 static int ic_dev_mtu __initdata;
167 
168 #ifdef IPCONFIG_DYNAMIC
169 static DEFINE_SPINLOCK(ic_recv_lock);
170 static volatile int ic_got_reply __initdata;    /* Proto(s) that replied */
171 #endif
172 #ifdef IPCONFIG_DHCP
173 static int ic_dhcp_msgtype __initdata;  /* DHCP msg type received */
174 #endif
175 
176 
177 /*
178  *      Network devices
179  */
180 
181 struct ic_device {
182         struct ic_device *next;
183         struct net_device *dev;
184         unsigned short flags;
185         short able;
186         __be32 xid;
187 };
188 
189 static struct ic_device *ic_first_dev __initdata;       /* List of open device */
190 static struct net_device *ic_dev __initdata;            /* Selected device */
191 
192 static bool __init ic_is_init_dev(struct net_device *dev)
193 {
194         if (dev->flags & IFF_LOOPBACK)
195                 return false;
196         return user_dev_name[0] ? !strcmp(dev->name, user_dev_name) :
197             (!(dev->flags & IFF_LOOPBACK) &&
198              (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) &&
199              strncmp(dev->name, "dummy", 5));
200 }
201 
202 static int __init ic_open_devs(void)
203 {
204         struct ic_device *d, **last;
205         struct net_device *dev;
206         unsigned short oflags;
207         unsigned long start, next_msg;
208 
209         last = &ic_first_dev;
210         rtnl_lock();
211 
212         /* bring loopback and DSA master network devices up first */
213         for_each_netdev(&init_net, dev) {
214                 if (!(dev->flags & IFF_LOOPBACK) && !netdev_uses_dsa(dev))
215                         continue;
216                 if (dev_change_flags(dev, dev->flags | IFF_UP) < 0)
217                         pr_err("IP-Config: Failed to open %s\n", dev->name);
218         }
219 
220         for_each_netdev(&init_net, dev) {
221                 if (ic_is_init_dev(dev)) {
222                         int able = 0;
223                         if (dev->mtu >= 364)
224                                 able |= IC_BOOTP;
225                         else
226                                 pr_warn("DHCP/BOOTP: Ignoring device %s, MTU %d too small",
227                                         dev->name, dev->mtu);
228                         if (!(dev->flags & IFF_NOARP))
229                                 able |= IC_RARP;
230                         able &= ic_proto_enabled;
231                         if (ic_proto_enabled && !able)
232                                 continue;
233                         oflags = dev->flags;
234                         if (dev_change_flags(dev, oflags | IFF_UP) < 0) {
235                                 pr_err("IP-Config: Failed to open %s\n",
236                                        dev->name);
237                                 continue;
238                         }
239                         if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) {
240                                 rtnl_unlock();
241                                 return -ENOMEM;
242                         }
243                         d->dev = dev;
244                         *last = d;
245                         last = &d->next;
246                         d->flags = oflags;
247                         d->able = able;
248                         if (able & IC_BOOTP)
249                                 get_random_bytes(&d->xid, sizeof(__be32));
250                         else
251                                 d->xid = 0;
252                         ic_proto_have_if |= able;
253                         DBG(("IP-Config: %s UP (able=%d, xid=%08x)\n",
254                                 dev->name, able, d->xid));
255                 }
256         }
257 
258         /* no point in waiting if we could not bring up at least one device */
259         if (!ic_first_dev)
260                 goto have_carrier;
261 
262         /* wait for a carrier on at least one device */
263         start = jiffies;
264         next_msg = start + msecs_to_jiffies(CONF_CARRIER_TIMEOUT/12);
265         while (time_before(jiffies, start +
266                            msecs_to_jiffies(CONF_CARRIER_TIMEOUT))) {
267                 int wait, elapsed;
268 
269                 for_each_netdev(&init_net, dev)
270                         if (ic_is_init_dev(dev) && netif_carrier_ok(dev))
271                                 goto have_carrier;
272 
273                 msleep(1);
274 
275                 if (time_before(jiffies, next_msg))
276                         continue;
277 
278                 elapsed = jiffies_to_msecs(jiffies - start);
279                 wait = (CONF_CARRIER_TIMEOUT - elapsed + 500)/1000;
280                 pr_info("Waiting up to %d more seconds for network.\n", wait);
281                 next_msg = jiffies + msecs_to_jiffies(CONF_CARRIER_TIMEOUT/12);
282         }
283 have_carrier:
284         rtnl_unlock();
285 
286         *last = NULL;
287 
288         if (!ic_first_dev) {
289                 if (user_dev_name[0])
290                         pr_err("IP-Config: Device `%s' not found\n",
291                                user_dev_name);
292                 else
293                         pr_err("IP-Config: No network devices available\n");
294                 return -ENODEV;
295         }
296         return 0;
297 }
298 
299 static void __init ic_close_devs(void)
300 {
301         struct ic_device *d, *next;
302         struct net_device *dev;
303 
304         rtnl_lock();
305         next = ic_first_dev;
306         while ((d = next)) {
307                 next = d->next;
308                 dev = d->dev;
309                 if (dev != ic_dev && !netdev_uses_dsa(dev)) {
310                         DBG(("IP-Config: Downing %s\n", dev->name));
311                         dev_change_flags(dev, d->flags);
312                 }
313                 kfree(d);
314         }
315         rtnl_unlock();
316 }
317 
318 /*
319  *      Interface to various network functions.
320  */
321 
322 static inline void
323 set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port)
324 {
325         sin->sin_family = AF_INET;
326         sin->sin_addr.s_addr = addr;
327         sin->sin_port = port;
328 }
329 
330 static int __init ic_devinet_ioctl(unsigned int cmd, struct ifreq *arg)
331 {
332         int res;
333 
334         mm_segment_t oldfs = get_fs();
335         set_fs(get_ds());
336         res = devinet_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
337         set_fs(oldfs);
338         return res;
339 }
340 
341 static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg)
342 {
343         int res;
344 
345         mm_segment_t oldfs = get_fs();
346         set_fs(get_ds());
347         res = dev_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
348         set_fs(oldfs);
349         return res;
350 }
351 
352 static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg)
353 {
354         int res;
355 
356         mm_segment_t oldfs = get_fs();
357         set_fs(get_ds());
358         res = ip_rt_ioctl(&init_net, cmd, (void __user *) arg);
359         set_fs(oldfs);
360         return res;
361 }
362 
363 /*
364  *      Set up interface addresses and routes.
365  */
366 
367 static int __init ic_setup_if(void)
368 {
369         struct ifreq ir;
370         struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr;
371         int err;
372 
373         memset(&ir, 0, sizeof(ir));
374         strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name);
375         set_sockaddr(sin, ic_myaddr, 0);
376         if ((err = ic_devinet_ioctl(SIOCSIFADDR, &ir)) < 0) {
377                 pr_err("IP-Config: Unable to set interface address (%d)\n",
378                        err);
379                 return -1;
380         }
381         set_sockaddr(sin, ic_netmask, 0);
382         if ((err = ic_devinet_ioctl(SIOCSIFNETMASK, &ir)) < 0) {
383                 pr_err("IP-Config: Unable to set interface netmask (%d)\n",
384                        err);
385                 return -1;
386         }
387         set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0);
388         if ((err = ic_devinet_ioctl(SIOCSIFBRDADDR, &ir)) < 0) {
389                 pr_err("IP-Config: Unable to set interface broadcast address (%d)\n",
390                        err);
391                 return -1;
392         }
393         /* Handle the case where we need non-standard MTU on the boot link (a network
394          * using jumbo frames, for instance).  If we can't set the mtu, don't error
395          * out, we'll try to muddle along.
396          */
397         if (ic_dev_mtu != 0) {
398                 strcpy(ir.ifr_name, ic_dev->name);
399                 ir.ifr_mtu = ic_dev_mtu;
400                 if ((err = ic_dev_ioctl(SIOCSIFMTU, &ir)) < 0)
401                         pr_err("IP-Config: Unable to set interface mtu to %d (%d)\n",
402                                ic_dev_mtu, err);
403         }
404         return 0;
405 }
406 
407 static int __init ic_setup_routes(void)
408 {
409         /* No need to setup device routes, only the default route... */
410 
411         if (ic_gateway != NONE) {
412                 struct rtentry rm;
413                 int err;
414 
415                 memset(&rm, 0, sizeof(rm));
416                 if ((ic_gateway ^ ic_myaddr) & ic_netmask) {
417                         pr_err("IP-Config: Gateway not on directly connected network\n");
418                         return -1;
419                 }
420                 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0);
421                 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0);
422                 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0);
423                 rm.rt_flags = RTF_UP | RTF_GATEWAY;
424                 if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) {
425                         pr_err("IP-Config: Cannot add default route (%d)\n",
426                                err);
427                         return -1;
428                 }
429         }
430 
431         return 0;
432 }
433 
434 /*
435  *      Fill in default values for all missing parameters.
436  */
437 
438 static int __init ic_defaults(void)
439 {
440         /*
441          *      At this point we have no userspace running so need not
442          *      claim locks on system_utsname
443          */
444 
445         if (!ic_host_name_set)
446                 sprintf(init_utsname()->nodename, "%pI4", &ic_myaddr);
447 
448         if (root_server_addr == NONE)
449                 root_server_addr = ic_servaddr;
450 
451         if (ic_netmask == NONE) {
452                 if (IN_CLASSA(ntohl(ic_myaddr)))
453                         ic_netmask = htonl(IN_CLASSA_NET);
454                 else if (IN_CLASSB(ntohl(ic_myaddr)))
455                         ic_netmask = htonl(IN_CLASSB_NET);
456                 else if (IN_CLASSC(ntohl(ic_myaddr)))
457                         ic_netmask = htonl(IN_CLASSC_NET);
458                 else {
459                         pr_err("IP-Config: Unable to guess netmask for address %pI4\n",
460                                &ic_myaddr);
461                         return -1;
462                 }
463                 printk("IP-Config: Guessing netmask %pI4\n", &ic_netmask);
464         }
465 
466         return 0;
467 }
468 
469 /*
470  *      RARP support.
471  */
472 
473 #ifdef IPCONFIG_RARP
474 
475 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
476 
477 static struct packet_type rarp_packet_type __initdata = {
478         .type = cpu_to_be16(ETH_P_RARP),
479         .func = ic_rarp_recv,
480 };
481 
482 static inline void __init ic_rarp_init(void)
483 {
484         dev_add_pack(&rarp_packet_type);
485 }
486 
487 static inline void __init ic_rarp_cleanup(void)
488 {
489         dev_remove_pack(&rarp_packet_type);
490 }
491 
492 /*
493  *  Process received RARP packet.
494  */
495 static int __init
496 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
497 {
498         struct arphdr *rarp;
499         unsigned char *rarp_ptr;
500         __be32 sip, tip;
501         unsigned char *tha;             /* t for "target" */
502         struct ic_device *d;
503 
504         if (!net_eq(dev_net(dev), &init_net))
505                 goto drop;
506 
507         if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
508                 return NET_RX_DROP;
509 
510         if (!pskb_may_pull(skb, sizeof(struct arphdr)))
511                 goto drop;
512 
513         /* Basic sanity checks can be done without the lock.  */
514         rarp = (struct arphdr *)skb_transport_header(skb);
515 
516         /* If this test doesn't pass, it's not IP, or we should
517          * ignore it anyway.
518          */
519         if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd))
520                 goto drop;
521 
522         /* If it's not a RARP reply, delete it. */
523         if (rarp->ar_op != htons(ARPOP_RREPLY))
524                 goto drop;
525 
526         /* If it's not Ethernet, delete it. */
527         if (rarp->ar_pro != htons(ETH_P_IP))
528                 goto drop;
529 
530         if (!pskb_may_pull(skb, arp_hdr_len(dev)))
531                 goto drop;
532 
533         /* OK, it is all there and looks valid, process... */
534         rarp = (struct arphdr *)skb_transport_header(skb);
535         rarp_ptr = (unsigned char *) (rarp + 1);
536 
537         /* One reply at a time, please. */
538         spin_lock(&ic_recv_lock);
539 
540         /* If we already have a reply, just drop the packet */
541         if (ic_got_reply)
542                 goto drop_unlock;
543 
544         /* Find the ic_device that the packet arrived on */
545         d = ic_first_dev;
546         while (d && d->dev != dev)
547                 d = d->next;
548         if (!d)
549                 goto drop_unlock;       /* should never happen */
550 
551         /* Extract variable-width fields */
552         rarp_ptr += dev->addr_len;
553         memcpy(&sip, rarp_ptr, 4);
554         rarp_ptr += 4;
555         tha = rarp_ptr;
556         rarp_ptr += dev->addr_len;
557         memcpy(&tip, rarp_ptr, 4);
558 
559         /* Discard packets which are not meant for us. */
560         if (memcmp(tha, dev->dev_addr, dev->addr_len))
561                 goto drop_unlock;
562 
563         /* Discard packets which are not from specified server. */
564         if (ic_servaddr != NONE && ic_servaddr != sip)
565                 goto drop_unlock;
566 
567         /* We have a winner! */
568         ic_dev = dev;
569         if (ic_myaddr == NONE)
570                 ic_myaddr = tip;
571         ic_servaddr = sip;
572         ic_addrservaddr = sip;
573         ic_got_reply = IC_RARP;
574 
575 drop_unlock:
576         /* Show's over.  Nothing to see here.  */
577         spin_unlock(&ic_recv_lock);
578 
579 drop:
580         /* Throw the packet out. */
581         kfree_skb(skb);
582         return 0;
583 }
584 
585 
586 /*
587  *  Send RARP request packet over a single interface.
588  */
589 static void __init ic_rarp_send_if(struct ic_device *d)
590 {
591         struct net_device *dev = d->dev;
592         arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL,
593                  dev->dev_addr, dev->dev_addr);
594 }
595 #endif
596 
597 /*
598  *  Predefine Nameservers
599  */
600 static inline void __init ic_nameservers_predef(void)
601 {
602         int i;
603 
604         for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
605                 ic_nameservers[i] = NONE;
606 }
607 
608 /*
609  *      DHCP/BOOTP support.
610  */
611 
612 #ifdef IPCONFIG_BOOTP
613 
614 struct bootp_pkt {              /* BOOTP packet format */
615         struct iphdr iph;       /* IP header */
616         struct udphdr udph;     /* UDP header */
617         u8 op;                  /* 1=request, 2=reply */
618         u8 htype;               /* HW address type */
619         u8 hlen;                /* HW address length */
620         u8 hops;                /* Used only by gateways */
621         __be32 xid;             /* Transaction ID */
622         __be16 secs;            /* Seconds since we started */
623         __be16 flags;           /* Just what it says */
624         __be32 client_ip;               /* Client's IP address if known */
625         __be32 your_ip;         /* Assigned IP address */
626         __be32 server_ip;               /* (Next, e.g. NFS) Server's IP address */
627         __be32 relay_ip;                /* IP address of BOOTP relay */
628         u8 hw_addr[16];         /* Client's HW address */
629         u8 serv_name[64];       /* Server host name */
630         u8 boot_file[128];      /* Name of boot file */
631         u8 exten[312];          /* DHCP options / BOOTP vendor extensions */
632 };
633 
634 /* packet ops */
635 #define BOOTP_REQUEST   1
636 #define BOOTP_REPLY     2
637 
638 /* DHCP message types */
639 #define DHCPDISCOVER    1
640 #define DHCPOFFER       2
641 #define DHCPREQUEST     3
642 #define DHCPDECLINE     4
643 #define DHCPACK         5
644 #define DHCPNAK         6
645 #define DHCPRELEASE     7
646 #define DHCPINFORM      8
647 
648 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
649 
650 static struct packet_type bootp_packet_type __initdata = {
651         .type = cpu_to_be16(ETH_P_IP),
652         .func = ic_bootp_recv,
653 };
654 
655 static __be32 ic_dev_xid;               /* Device under configuration */
656 
657 /*
658  *  Initialize DHCP/BOOTP extension fields in the request.
659  */
660 
661 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 };
662 
663 #ifdef IPCONFIG_DHCP
664 
665 static void __init
666 ic_dhcp_init_options(u8 *options)
667 {
668         u8 mt = ((ic_servaddr == NONE)
669                  ? DHCPDISCOVER : DHCPREQUEST);
670         u8 *e = options;
671         int len;
672 
673 #ifdef IPCONFIG_DEBUG
674         printk("DHCP: Sending message type %d\n", mt);
675 #endif
676 
677         memcpy(e, ic_bootp_cookie, 4);  /* RFC1048 Magic Cookie */
678         e += 4;
679 
680         *e++ = 53;              /* DHCP message type */
681         *e++ = 1;
682         *e++ = mt;
683 
684         if (mt == DHCPREQUEST) {
685                 *e++ = 54;      /* Server ID (IP address) */
686                 *e++ = 4;
687                 memcpy(e, &ic_servaddr, 4);
688                 e += 4;
689 
690                 *e++ = 50;      /* Requested IP address */
691                 *e++ = 4;
692                 memcpy(e, &ic_myaddr, 4);
693                 e += 4;
694         }
695 
696         /* always? */
697         {
698                 static const u8 ic_req_params[] = {
699                         1,      /* Subnet mask */
700                         3,      /* Default gateway */
701                         6,      /* DNS server */
702                         12,     /* Host name */
703                         15,     /* Domain name */
704                         17,     /* Boot path */
705                         26,     /* MTU */
706                         40,     /* NIS domain name */
707                 };
708 
709                 *e++ = 55;      /* Parameter request list */
710                 *e++ = sizeof(ic_req_params);
711                 memcpy(e, ic_req_params, sizeof(ic_req_params));
712                 e += sizeof(ic_req_params);
713 
714                 if (ic_host_name_set) {
715                         *e++ = 12;      /* host-name */
716                         len = strlen(utsname()->nodename);
717                         *e++ = len;
718                         memcpy(e, utsname()->nodename, len);
719                         e += len;
720                 }
721                 if (*vendor_class_identifier) {
722                         pr_info("DHCP: sending class identifier \"%s\"\n",
723                                 vendor_class_identifier);
724                         *e++ = 60;      /* Class-identifier */
725                         len = strlen(vendor_class_identifier);
726                         *e++ = len;
727                         memcpy(e, vendor_class_identifier, len);
728                         e += len;
729                 }
730         }
731 
732         *e++ = 255;     /* End of the list */
733 }
734 
735 #endif /* IPCONFIG_DHCP */
736 
737 static void __init ic_bootp_init_ext(u8 *e)
738 {
739         memcpy(e, ic_bootp_cookie, 4);  /* RFC1048 Magic Cookie */
740         e += 4;
741         *e++ = 1;               /* Subnet mask request */
742         *e++ = 4;
743         e += 4;
744         *e++ = 3;               /* Default gateway request */
745         *e++ = 4;
746         e += 4;
747         *e++ = 5;               /* Name server request */
748         *e++ = 8;
749         e += 8;
750         *e++ = 12;              /* Host name request */
751         *e++ = 32;
752         e += 32;
753         *e++ = 40;              /* NIS Domain name request */
754         *e++ = 32;
755         e += 32;
756         *e++ = 17;              /* Boot path */
757         *e++ = 40;
758         e += 40;
759 
760         *e++ = 57;              /* set extension buffer size for reply */
761         *e++ = 2;
762         *e++ = 1;               /* 128+236+8+20+14, see dhcpd sources */
763         *e++ = 150;
764 
765         *e++ = 255;             /* End of the list */
766 }
767 
768 
769 /*
770  *  Initialize the DHCP/BOOTP mechanism.
771  */
772 static inline void __init ic_bootp_init(void)
773 {
774         ic_nameservers_predef();
775 
776         dev_add_pack(&bootp_packet_type);
777 }
778 
779 
780 /*
781  *  DHCP/BOOTP cleanup.
782  */
783 static inline void __init ic_bootp_cleanup(void)
784 {
785         dev_remove_pack(&bootp_packet_type);
786 }
787 
788 
789 /*
790  *  Send DHCP/BOOTP request to single interface.
791  */
792 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff)
793 {
794         struct net_device *dev = d->dev;
795         struct sk_buff *skb;
796         struct bootp_pkt *b;
797         struct iphdr *h;
798         int hlen = LL_RESERVED_SPACE(dev);
799         int tlen = dev->needed_tailroom;
800 
801         /* Allocate packet */
802         skb = alloc_skb(sizeof(struct bootp_pkt) + hlen + tlen + 15,
803                         GFP_KERNEL);
804         if (!skb)
805                 return;
806         skb_reserve(skb, hlen);
807         b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt));
808         memset(b, 0, sizeof(struct bootp_pkt));
809 
810         /* Construct IP header */
811         skb_reset_network_header(skb);
812         h = ip_hdr(skb);
813         h->version = 4;
814         h->ihl = 5;
815         h->tot_len = htons(sizeof(struct bootp_pkt));
816         h->frag_off = htons(IP_DF);
817         h->ttl = 64;
818         h->protocol = IPPROTO_UDP;
819         h->daddr = htonl(INADDR_BROADCAST);
820         h->check = ip_fast_csum((unsigned char *) h, h->ihl);
821 
822         /* Construct UDP header */
823         b->udph.source = htons(68);
824         b->udph.dest = htons(67);
825         b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr));
826         /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */
827 
828         /* Construct DHCP/BOOTP header */
829         b->op = BOOTP_REQUEST;
830         if (dev->type < 256) /* check for false types */
831                 b->htype = dev->type;
832         else if (dev->type == ARPHRD_FDDI)
833                 b->htype = ARPHRD_ETHER;
834         else {
835                 printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name);
836                 b->htype = dev->type; /* can cause undefined behavior */
837         }
838 
839         /* server_ip and your_ip address are both already zero per RFC2131 */
840         b->hlen = dev->addr_len;
841         memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
842         b->secs = htons(jiffies_diff / HZ);
843         b->xid = d->xid;
844 
845         /* add DHCP options or BOOTP extensions */
846 #ifdef IPCONFIG_DHCP
847         if (ic_proto_enabled & IC_USE_DHCP)
848                 ic_dhcp_init_options(b->exten);
849         else
850 #endif
851                 ic_bootp_init_ext(b->exten);
852 
853         /* Chain packet down the line... */
854         skb->dev = dev;
855         skb->protocol = htons(ETH_P_IP);
856         if (dev_hard_header(skb, dev, ntohs(skb->protocol),
857                             dev->broadcast, dev->dev_addr, skb->len) < 0) {
858                 kfree_skb(skb);
859                 printk("E");
860                 return;
861         }
862 
863         if (dev_queue_xmit(skb) < 0)
864                 printk("E");
865 }
866 
867 
868 /*
869  *  Copy BOOTP-supplied string if not already set.
870  */
871 static int __init ic_bootp_string(char *dest, char *src, int len, int max)
872 {
873         if (!len)
874                 return 0;
875         if (len > max-1)
876                 len = max-1;
877         memcpy(dest, src, len);
878         dest[len] = '\0';
879         return 1;
880 }
881 
882 
883 /*
884  *  Process BOOTP extensions.
885  */
886 static void __init ic_do_bootp_ext(u8 *ext)
887 {
888         u8 servers;
889         int i;
890         __be16 mtu;
891 
892 #ifdef IPCONFIG_DEBUG
893         u8 *c;
894 
895         printk("DHCP/BOOTP: Got extension %d:",*ext);
896         for (c=ext+2; c<ext+2+ext[1]; c++)
897                 printk(" %02x", *c);
898         printk("\n");
899 #endif
900 
901         switch (*ext++) {
902         case 1:         /* Subnet mask */
903                 if (ic_netmask == NONE)
904                         memcpy(&ic_netmask, ext+1, 4);
905                 break;
906         case 3:         /* Default gateway */
907                 if (ic_gateway == NONE)
908                         memcpy(&ic_gateway, ext+1, 4);
909                 break;
910         case 6:         /* DNS server */
911                 servers= *ext/4;
912                 if (servers > CONF_NAMESERVERS_MAX)
913                         servers = CONF_NAMESERVERS_MAX;
914                 for (i = 0; i < servers; i++) {
915                         if (ic_nameservers[i] == NONE)
916                                 memcpy(&ic_nameservers[i], ext+1+4*i, 4);
917                 }
918                 break;
919         case 12:        /* Host name */
920                 ic_bootp_string(utsname()->nodename, ext+1, *ext,
921                                 __NEW_UTS_LEN);
922                 ic_host_name_set = 1;
923                 break;
924         case 15:        /* Domain name (DNS) */
925                 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
926                 break;
927         case 17:        /* Root path */
928                 if (!root_server_path[0])
929                         ic_bootp_string(root_server_path, ext+1, *ext,
930                                         sizeof(root_server_path));
931                 break;
932         case 26:        /* Interface MTU */
933                 memcpy(&mtu, ext+1, sizeof(mtu));
934                 ic_dev_mtu = ntohs(mtu);
935                 break;
936         case 40:        /* NIS Domain name (_not_ DNS) */
937                 ic_bootp_string(utsname()->domainname, ext+1, *ext,
938                                 __NEW_UTS_LEN);
939                 break;
940         }
941 }
942 
943 
944 /*
945  *  Receive BOOTP reply.
946  */
947 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
948 {
949         struct bootp_pkt *b;
950         struct iphdr *h;
951         struct ic_device *d;
952         int len, ext_len;
953 
954         if (!net_eq(dev_net(dev), &init_net))
955                 goto drop;
956 
957         /* Perform verifications before taking the lock.  */
958         if (skb->pkt_type == PACKET_OTHERHOST)
959                 goto drop;
960 
961         if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
962                 return NET_RX_DROP;
963 
964         if (!pskb_may_pull(skb,
965                            sizeof(struct iphdr) +
966                            sizeof(struct udphdr)))
967                 goto drop;
968 
969         b = (struct bootp_pkt *)skb_network_header(skb);
970         h = &b->iph;
971 
972         if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP)
973                 goto drop;
974 
975         /* Fragments are not supported */
976         if (ip_is_fragment(h)) {
977                 net_err_ratelimited("DHCP/BOOTP: Ignoring fragmented reply\n");
978                 goto drop;
979         }
980 
981         if (skb->len < ntohs(h->tot_len))
982                 goto drop;
983 
984         if (ip_fast_csum((char *) h, h->ihl))
985                 goto drop;
986 
987         if (b->udph.source != htons(67) || b->udph.dest != htons(68))
988                 goto drop;
989 
990         if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
991                 goto drop;
992 
993         len = ntohs(b->udph.len) - sizeof(struct udphdr);
994         ext_len = len - (sizeof(*b) -
995                          sizeof(struct iphdr) -
996                          sizeof(struct udphdr) -
997                          sizeof(b->exten));
998         if (ext_len < 0)
999                 goto drop;
1000 
1001         /* Ok the front looks good, make sure we can get at the rest.  */
1002         if (!pskb_may_pull(skb, skb->len))
1003                 goto drop;
1004 
1005         b = (struct bootp_pkt *)skb_network_header(skb);
1006         h = &b->iph;
1007 
1008         /* One reply at a time, please. */
1009         spin_lock(&ic_recv_lock);
1010 
1011         /* If we already have a reply, just drop the packet */
1012         if (ic_got_reply)
1013                 goto drop_unlock;
1014 
1015         /* Find the ic_device that the packet arrived on */
1016         d = ic_first_dev;
1017         while (d && d->dev != dev)
1018                 d = d->next;
1019         if (!d)
1020                 goto drop_unlock;  /* should never happen */
1021 
1022         /* Is it a reply to our BOOTP request? */
1023         if (b->op != BOOTP_REPLY ||
1024             b->xid != d->xid) {
1025                 net_err_ratelimited("DHCP/BOOTP: Reply not for us, op[%x] xid[%x]\n",
1026                                     b->op, b->xid);
1027                 goto drop_unlock;
1028         }
1029 
1030         /* Is it a reply for the device we are configuring? */
1031         if (b->xid != ic_dev_xid) {
1032                 net_err_ratelimited("DHCP/BOOTP: Ignoring delayed packet\n");
1033                 goto drop_unlock;
1034         }
1035 
1036         /* Parse extensions */
1037         if (ext_len >= 4 &&
1038             !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */
1039                 u8 *end = (u8 *) b + ntohs(b->iph.tot_len);
1040                 u8 *ext;
1041 
1042 #ifdef IPCONFIG_DHCP
1043                 if (ic_proto_enabled & IC_USE_DHCP) {
1044                         __be32 server_id = NONE;
1045                         int mt = 0;
1046 
1047                         ext = &b->exten[4];
1048                         while (ext < end && *ext != 0xff) {
1049                                 u8 *opt = ext++;
1050                                 if (*opt == 0)  /* Padding */
1051                                         continue;
1052                                 ext += *ext + 1;
1053                                 if (ext >= end)
1054                                         break;
1055                                 switch (*opt) {
1056                                 case 53:        /* Message type */
1057                                         if (opt[1])
1058                                                 mt = opt[2];
1059                                         break;
1060                                 case 54:        /* Server ID (IP address) */
1061                                         if (opt[1] >= 4)
1062                                                 memcpy(&server_id, opt + 2, 4);
1063                                         break;
1064                                 }
1065                         }
1066 
1067 #ifdef IPCONFIG_DEBUG
1068                         printk("DHCP: Got message type %d\n", mt);
1069 #endif
1070 
1071                         switch (mt) {
1072                         case DHCPOFFER:
1073                                 /* While in the process of accepting one offer,
1074                                  * ignore all others.
1075                                  */
1076                                 if (ic_myaddr != NONE)
1077                                         goto drop_unlock;
1078 
1079                                 /* Let's accept that offer. */
1080                                 ic_myaddr = b->your_ip;
1081                                 ic_servaddr = server_id;
1082 #ifdef IPCONFIG_DEBUG
1083                                 printk("DHCP: Offered address %pI4 by server %pI4\n",
1084                                        &ic_myaddr, &b->iph.saddr);
1085 #endif
1086                                 /* The DHCP indicated server address takes
1087                                  * precedence over the bootp header one if
1088                                  * they are different.
1089                                  */
1090                                 if ((server_id != NONE) &&
1091                                     (b->server_ip != server_id))
1092                                         b->server_ip = ic_servaddr;
1093                                 break;
1094 
1095                         case DHCPACK:
1096                                 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0)
1097                                         goto drop_unlock;
1098 
1099                                 /* Yeah! */
1100                                 break;
1101 
1102                         default:
1103                                 /* Urque.  Forget it*/
1104                                 ic_myaddr = NONE;
1105                                 ic_servaddr = NONE;
1106                                 goto drop_unlock;
1107                         }
1108 
1109                         ic_dhcp_msgtype = mt;
1110 
1111                 }
1112 #endif /* IPCONFIG_DHCP */
1113 
1114                 ext = &b->exten[4];
1115                 while (ext < end && *ext != 0xff) {
1116                         u8 *opt = ext++;
1117                         if (*opt == 0)  /* Padding */
1118                                 continue;
1119                         ext += *ext + 1;
1120                         if (ext < end)
1121                                 ic_do_bootp_ext(opt);
1122                 }
1123         }
1124 
1125         /* We have a winner! */
1126         ic_dev = dev;
1127         ic_myaddr = b->your_ip;
1128         ic_servaddr = b->server_ip;
1129         ic_addrservaddr = b->iph.saddr;
1130         if (ic_gateway == NONE && b->relay_ip)
1131                 ic_gateway = b->relay_ip;
1132         if (ic_nameservers[0] == NONE)
1133                 ic_nameservers[0] = ic_servaddr;
1134         ic_got_reply = IC_BOOTP;
1135 
1136 drop_unlock:
1137         /* Show's over.  Nothing to see here.  */
1138         spin_unlock(&ic_recv_lock);
1139 
1140 drop:
1141         /* Throw the packet out. */
1142         kfree_skb(skb);
1143 
1144         return 0;
1145 }
1146 
1147 
1148 #endif
1149 
1150 
1151 /*
1152  *      Dynamic IP configuration -- DHCP, BOOTP, RARP.
1153  */
1154 
1155 #ifdef IPCONFIG_DYNAMIC
1156 
1157 static int __init ic_dynamic(void)
1158 {
1159         int retries;
1160         struct ic_device *d;
1161         unsigned long start_jiffies, timeout, jiff;
1162         int do_bootp = ic_proto_have_if & IC_BOOTP;
1163         int do_rarp = ic_proto_have_if & IC_RARP;
1164 
1165         /*
1166          * If none of DHCP/BOOTP/RARP was selected, return with an error.
1167          * This routine gets only called when some pieces of information
1168          * are missing, and without DHCP/BOOTP/RARP we are unable to get it.
1169          */
1170         if (!ic_proto_enabled) {
1171                 pr_err("IP-Config: Incomplete network configuration information\n");
1172                 return -1;
1173         }
1174 
1175 #ifdef IPCONFIG_BOOTP
1176         if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
1177                 pr_err("DHCP/BOOTP: No suitable device found\n");
1178 #endif
1179 #ifdef IPCONFIG_RARP
1180         if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)
1181                 pr_err("RARP: No suitable device found\n");
1182 #endif
1183 
1184         if (!ic_proto_have_if)
1185                 /* Error message already printed */
1186                 return -1;
1187 
1188         /*
1189          * Setup protocols
1190          */
1191 #ifdef IPCONFIG_BOOTP
1192         if (do_bootp)
1193                 ic_bootp_init();
1194 #endif
1195 #ifdef IPCONFIG_RARP
1196         if (do_rarp)
1197                 ic_rarp_init();
1198 #endif
1199 
1200         /*
1201          * Send requests and wait, until we get an answer. This loop
1202          * seems to be a terrible waste of CPU time, but actually there is
1203          * only one process running at all, so we don't need to use any
1204          * scheduler functions.
1205          * [Actually we could now, but the nothing else running note still
1206          *  applies.. - AC]
1207          */
1208         pr_notice("Sending %s%s%s requests .",
1209                   do_bootp
1210                   ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "",
1211                   (do_bootp && do_rarp) ? " and " : "",
1212                   do_rarp ? "RARP" : "");
1213 
1214         start_jiffies = jiffies;
1215         d = ic_first_dev;
1216         retries = CONF_SEND_RETRIES;
1217         get_random_bytes(&timeout, sizeof(timeout));
1218         timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned int) CONF_TIMEOUT_RANDOM);
1219         for (;;) {
1220 #ifdef IPCONFIG_BOOTP
1221                 /* Track the device we are configuring */
1222                 ic_dev_xid = d->xid;
1223 
1224                 if (do_bootp && (d->able & IC_BOOTP))
1225                         ic_bootp_send_if(d, jiffies - start_jiffies);
1226 #endif
1227 #ifdef IPCONFIG_RARP
1228                 if (do_rarp && (d->able & IC_RARP))
1229                         ic_rarp_send_if(d);
1230 #endif
1231 
1232                 jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout);
1233                 while (time_before(jiffies, jiff) && !ic_got_reply)
1234                         schedule_timeout_uninterruptible(1);
1235 #ifdef IPCONFIG_DHCP
1236                 /* DHCP isn't done until we get a DHCPACK. */
1237                 if ((ic_got_reply & IC_BOOTP) &&
1238                     (ic_proto_enabled & IC_USE_DHCP) &&
1239                     ic_dhcp_msgtype != DHCPACK) {
1240                         ic_got_reply = 0;
1241                         pr_cont(",");
1242                         continue;
1243                 }
1244 #endif /* IPCONFIG_DHCP */
1245 
1246                 if (ic_got_reply) {
1247                         pr_cont(" OK\n");
1248                         break;
1249                 }
1250 
1251                 if ((d = d->next))
1252                         continue;
1253 
1254                 if (! --retries) {
1255                         pr_cont(" timed out!\n");
1256                         break;
1257                 }
1258 
1259                 d = ic_first_dev;
1260 
1261                 timeout = timeout CONF_TIMEOUT_MULT;
1262                 if (timeout > CONF_TIMEOUT_MAX)
1263                         timeout = CONF_TIMEOUT_MAX;
1264 
1265                 pr_cont(".");
1266         }
1267 
1268 #ifdef IPCONFIG_BOOTP
1269         if (do_bootp)
1270                 ic_bootp_cleanup();
1271 #endif
1272 #ifdef IPCONFIG_RARP
1273         if (do_rarp)
1274                 ic_rarp_cleanup();
1275 #endif
1276 
1277         if (!ic_got_reply) {
1278                 ic_myaddr = NONE;
1279                 return -1;
1280         }
1281 
1282         printk("IP-Config: Got %s answer from %pI4, ",
1283                 ((ic_got_reply & IC_RARP) ? "RARP"
1284                  : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),
1285                &ic_addrservaddr);
1286         pr_cont("my address is %pI4\n", &ic_myaddr);
1287 
1288         return 0;
1289 }
1290 
1291 #endif /* IPCONFIG_DYNAMIC */
1292 
1293 #ifdef CONFIG_PROC_FS
1294 
1295 static int pnp_seq_show(struct seq_file *seq, void *v)
1296 {
1297         int i;
1298 
1299         if (ic_proto_used & IC_PROTO)
1300                 seq_printf(seq, "#PROTO: %s\n",
1301                            (ic_proto_used & IC_RARP) ? "RARP"
1302                            : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP");
1303         else
1304                 seq_puts(seq, "#MANUAL\n");
1305 
1306         if (ic_domain[0])
1307                 seq_printf(seq,
1308                            "domain %s\n", ic_domain);
1309         for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {
1310                 if (ic_nameservers[i] != NONE)
1311                         seq_printf(seq, "nameserver %pI4\n",
1312                                    &ic_nameservers[i]);
1313         }
1314         if (ic_servaddr != NONE)
1315                 seq_printf(seq, "bootserver %pI4\n",
1316                            &ic_servaddr);
1317         return 0;
1318 }
1319 
1320 static int pnp_seq_open(struct inode *indoe, struct file *file)
1321 {
1322         return single_open(file, pnp_seq_show, NULL);
1323 }
1324 
1325 static const struct file_operations pnp_seq_fops = {
1326         .owner          = THIS_MODULE,
1327         .open           = pnp_seq_open,
1328         .read           = seq_read,
1329         .llseek         = seq_lseek,
1330         .release        = single_release,
1331 };
1332 #endif /* CONFIG_PROC_FS */
1333 
1334 /*
1335  *  Extract IP address from the parameter string if needed. Note that we
1336  *  need to have root_server_addr set _before_ IPConfig gets called as it
1337  *  can override it.
1338  */
1339 __be32 __init root_nfs_parse_addr(char *name)
1340 {
1341         __be32 addr;
1342         int octets = 0;
1343         char *cp, *cq;
1344 
1345         cp = cq = name;
1346         while (octets < 4) {
1347                 while (*cp >= '' && *cp <= '9')
1348                         cp++;
1349                 if (cp == cq || cp - cq > 3)
1350                         break;
1351                 if (*cp == '.' || octets == 3)
1352                         octets++;
1353                 if (octets < 4)
1354                         cp++;
1355                 cq = cp;
1356         }
1357         if (octets == 4 && (*cp == ':' || *cp == '\0')) {
1358                 if (*cp == ':')
1359                         *cp++ = '\0';
1360                 addr = in_aton(name);
1361                 memmove(name, cp, strlen(cp) + 1);
1362         } else
1363                 addr = NONE;
1364 
1365         return addr;
1366 }
1367 
1368 #define DEVICE_WAIT_MAX         12 /* 12 seconds */
1369 
1370 static int __init wait_for_devices(void)
1371 {
1372         int i;
1373 
1374         for (i = 0; i < DEVICE_WAIT_MAX; i++) {
1375                 struct net_device *dev;
1376                 int found = 0;
1377 
1378                 rtnl_lock();
1379                 for_each_netdev(&init_net, dev) {
1380                         if (ic_is_init_dev(dev)) {
1381                                 found = 1;
1382                                 break;
1383                         }
1384                 }
1385                 rtnl_unlock();
1386                 if (found)
1387                         return 0;
1388                 ssleep(1);
1389         }
1390         return -ENODEV;
1391 }
1392 
1393 /*
1394  *      IP Autoconfig dispatcher.
1395  */
1396 
1397 static int __init ip_auto_config(void)
1398 {
1399         __be32 addr;
1400 #ifdef IPCONFIG_DYNAMIC
1401         int retries = CONF_OPEN_RETRIES;
1402 #endif
1403         int err;
1404         unsigned int i;
1405 
1406 #ifdef CONFIG_PROC_FS
1407         proc_create("pnp", S_IRUGO, init_net.proc_net, &pnp_seq_fops);
1408 #endif /* CONFIG_PROC_FS */
1409 
1410         if (!ic_enable)
1411                 return 0;
1412 
1413         DBG(("IP-Config: Entered.\n"));
1414 #ifdef IPCONFIG_DYNAMIC
1415  try_try_again:
1416 #endif
1417         /* Wait for devices to appear */
1418         err = wait_for_devices();
1419         if (err)
1420                 return err;
1421 
1422         /* Setup all network devices */
1423         err = ic_open_devs();
1424         if (err)
1425                 return err;
1426 
1427         /* Give drivers a chance to settle */
1428         msleep(CONF_POST_OPEN);
1429 
1430         /*
1431          * If the config information is insufficient (e.g., our IP address or
1432          * IP address of the boot server is missing or we have multiple network
1433          * interfaces and no default was set), use BOOTP or RARP to get the
1434          * missing values.
1435          */
1436         if (ic_myaddr == NONE ||
1437 #ifdef CONFIG_ROOT_NFS
1438             (root_server_addr == NONE &&
1439              ic_servaddr == NONE &&
1440              ROOT_DEV == Root_NFS) ||
1441 #endif
1442             ic_first_dev->next) {
1443 #ifdef IPCONFIG_DYNAMIC
1444                 if (ic_dynamic() < 0) {
1445                         ic_close_devs();
1446 
1447                         /*
1448                          * I don't know why, but sometimes the
1449                          * eepro100 driver (at least) gets upset and
1450                          * doesn't work the first time it's opened.
1451                          * But then if you close it and reopen it, it
1452                          * works just fine.  So we need to try that at
1453                          * least once before giving up.
1454                          *
1455                          * Also, if the root will be NFS-mounted, we
1456                          * have nowhere to go if DHCP fails.  So we
1457                          * just have to keep trying forever.
1458                          *
1459                          *                              -- Chip
1460                          */
1461 #ifdef CONFIG_ROOT_NFS
1462                         if (ROOT_DEV ==  Root_NFS) {
1463                                 pr_err("IP-Config: Retrying forever (NFS root)...\n");
1464                                 goto try_try_again;
1465                         }
1466 #endif
1467 
1468                         if (--retries) {
1469                                 pr_err("IP-Config: Reopening network devices...\n");
1470                                 goto try_try_again;
1471                         }
1472 
1473                         /* Oh, well.  At least we tried. */
1474                         pr_err("IP-Config: Auto-configuration of network failed\n");
1475                         return -1;
1476                 }
1477 #else /* !DYNAMIC */
1478                 pr_err("IP-Config: Incomplete network configuration information\n");
1479                 ic_close_devs();
1480                 return -1;
1481 #endif /* IPCONFIG_DYNAMIC */
1482         } else {
1483                 /* Device selected manually or only one device -> use it */
1484                 ic_dev = ic_first_dev->dev;
1485         }
1486 
1487         addr = root_nfs_parse_addr(root_server_path);
1488         if (root_server_addr == NONE)
1489                 root_server_addr = addr;
1490 
1491         /*
1492          * Use defaults wherever applicable.
1493          */
1494         if (ic_defaults() < 0)
1495                 return -1;
1496 
1497         /*
1498          * Close all network devices except the device we've
1499          * autoconfigured and set up routes.
1500          */
1501         ic_close_devs();
1502         if (ic_setup_if() < 0 || ic_setup_routes() < 0)
1503                 return -1;
1504 
1505         /*
1506          * Record which protocol was actually used.
1507          */
1508 #ifdef IPCONFIG_DYNAMIC
1509         ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP);
1510 #endif
1511 
1512 #ifndef IPCONFIG_SILENT
1513         /*
1514          * Clue in the operator.
1515          */
1516         pr_info("IP-Config: Complete:\n");
1517 
1518         pr_info("     device=%s, hwaddr=%*phC, ipaddr=%pI4, mask=%pI4, gw=%pI4\n",
1519                 ic_dev->name, ic_dev->addr_len, ic_dev->dev_addr,
1520                 &ic_myaddr, &ic_netmask, &ic_gateway);
1521         pr_info("     host=%s, domain=%s, nis-domain=%s\n",
1522                 utsname()->nodename, ic_domain, utsname()->domainname);
1523         pr_info("     bootserver=%pI4, rootserver=%pI4, rootpath=%s",
1524                 &ic_servaddr, &root_server_addr, root_server_path);
1525         if (ic_dev_mtu)
1526                 pr_cont(", mtu=%d", ic_dev_mtu);
1527         for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
1528                 if (ic_nameservers[i] != NONE) {
1529                         pr_info("     nameserver%u=%pI4",
1530                                 i, &ic_nameservers[i]);
1531                         break;
1532                 }
1533         for (i++; i < CONF_NAMESERVERS_MAX; i++)
1534                 if (ic_nameservers[i] != NONE)
1535                         pr_cont(", nameserver%u=%pI4", i, &ic_nameservers[i]);
1536         pr_cont("\n");
1537 #endif /* !SILENT */
1538 
1539         return 0;
1540 }
1541 
1542 late_initcall(ip_auto_config);
1543 
1544 
1545 /*
1546  *  Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
1547  *  command line parameter.  See Documentation/filesystems/nfs/nfsroot.txt.
1548  */
1549 static int __init ic_proto_name(char *name)
1550 {
1551         if (!strcmp(name, "on") || !strcmp(name, "any")) {
1552                 return 1;
1553         }
1554         if (!strcmp(name, "off") || !strcmp(name, "none")) {
1555                 return 0;
1556         }
1557 #ifdef CONFIG_IP_PNP_DHCP
1558         else if (!strcmp(name, "dhcp")) {
1559                 ic_proto_enabled &= ~IC_RARP;
1560                 return 1;
1561         }
1562 #endif
1563 #ifdef CONFIG_IP_PNP_BOOTP
1564         else if (!strcmp(name, "bootp")) {
1565                 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP);
1566                 return 1;
1567         }
1568 #endif
1569 #ifdef CONFIG_IP_PNP_RARP
1570         else if (!strcmp(name, "rarp")) {
1571                 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP);
1572                 return 1;
1573         }
1574 #endif
1575 #ifdef IPCONFIG_DYNAMIC
1576         else if (!strcmp(name, "both")) {
1577                 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */
1578                 return 1;
1579         }
1580 #endif
1581         return 0;
1582 }
1583 
1584 static int __init ip_auto_config_setup(char *addrs)
1585 {
1586         char *cp, *ip, *dp;
1587         int num = 0;
1588 
1589         ic_set_manually = 1;
1590         ic_enable = 1;
1591 
1592         /*
1593          * If any dhcp, bootp etc options are set, leave autoconfig on
1594          * and skip the below static IP processing.
1595          */
1596         if (ic_proto_name(addrs))
1597                 return 1;
1598 
1599         /* If no static IP is given, turn off autoconfig and bail.  */
1600         if (*addrs == 0 ||
1601             strcmp(addrs, "off") == 0 ||
1602             strcmp(addrs, "none") == 0) {
1603                 ic_enable = 0;
1604                 return 1;
1605         }
1606 
1607         ic_nameservers_predef();
1608 
1609         /* Parse string for static IP assignment.  */
1610         ip = addrs;
1611         while (ip && *ip) {
1612                 if ((cp = strchr(ip, ':')))
1613                         *cp++ = '\0';
1614                 if (strlen(ip) > 0) {
1615                         DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip));
1616                         switch (num) {
1617                         case 0:
1618                                 if ((ic_myaddr = in_aton(ip)) == ANY)
1619                                         ic_myaddr = NONE;
1620                                 break;
1621                         case 1:
1622                                 if ((ic_servaddr = in_aton(ip)) == ANY)
1623                                         ic_servaddr = NONE;
1624                                 break;
1625                         case 2:
1626                                 if ((ic_gateway = in_aton(ip)) == ANY)
1627                                         ic_gateway = NONE;
1628                                 break;
1629                         case 3:
1630                                 if ((ic_netmask = in_aton(ip)) == ANY)
1631                                         ic_netmask = NONE;
1632                                 break;
1633                         case 4:
1634                                 if ((dp = strchr(ip, '.'))) {
1635                                         *dp++ = '\0';
1636                                         strlcpy(utsname()->domainname, dp,
1637                                                 sizeof(utsname()->domainname));
1638                                 }
1639                                 strlcpy(utsname()->nodename, ip,
1640                                         sizeof(utsname()->nodename));
1641                                 ic_host_name_set = 1;
1642                                 break;
1643                         case 5:
1644                                 strlcpy(user_dev_name, ip, sizeof(user_dev_name));
1645                                 break;
1646                         case 6:
1647                                 if (ic_proto_name(ip) == 0 &&
1648                                     ic_myaddr == NONE) {
1649                                         ic_enable = 0;
1650                                 }
1651                                 break;
1652                         case 7:
1653                                 if (CONF_NAMESERVERS_MAX >= 1) {
1654                                         ic_nameservers[0] = in_aton(ip);
1655                                         if (ic_nameservers[0] == ANY)
1656                                                 ic_nameservers[0] = NONE;
1657                                 }
1658                                 break;
1659                         case 8:
1660                                 if (CONF_NAMESERVERS_MAX >= 2) {
1661                                         ic_nameservers[1] = in_aton(ip);
1662                                         if (ic_nameservers[1] == ANY)
1663                                                 ic_nameservers[1] = NONE;
1664                                 }
1665                                 break;
1666                         }
1667                 }
1668                 ip = cp;
1669                 num++;
1670         }
1671 
1672         return 1;
1673 }
1674 __setup("ip=", ip_auto_config_setup);
1675 
1676 static int __init nfsaddrs_config_setup(char *addrs)
1677 {
1678         return ip_auto_config_setup(addrs);
1679 }
1680 __setup("nfsaddrs=", nfsaddrs_config_setup);
1681 
1682 static int __init vendor_class_identifier_setup(char *addrs)
1683 {
1684         if (strlcpy(vendor_class_identifier, addrs,
1685                     sizeof(vendor_class_identifier))
1686             >= sizeof(vendor_class_identifier))
1687                 pr_warn("DHCP: vendorclass too long, truncated to \"%s\"",
1688                         vendor_class_identifier);
1689         return 1;
1690 }
1691 __setup("dhcpclass=", vendor_class_identifier_setup);
1692 

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