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

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  1 /*
  2  *  Automatic Configuration of IP -- use DHCP, BOOTP, RARP, or
  3  *  user-supplied information to configure own IP address and routes.
  4  *
  5  *  Copyright (C) 1996-1998 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
  6  *
  7  *  Derived from network configuration code in fs/nfs/nfsroot.c,
  8  *  originally Copyright (C) 1995, 1996 Gero Kuhlmann and me.
  9  *
 10  *  BOOTP rewritten to construct and analyse packets itself instead
 11  *  of misusing the IP layer. num_bugs_causing_wrong_arp_replies--;
 12  *                                           -- MJ, December 1998
 13  *
 14  *  Fixed ip_auto_config_setup calling at startup in the new "Linker Magic"
 15  *  initialization scheme.
 16  *      - Arnaldo Carvalho de Melo <acme@conectiva.com.br>, 08/11/1999
 17  *
 18  *  DHCP support added.  To users this looks like a whole separate
 19  *  protocol, but we know it's just a bag on the side of BOOTP.
 20  *              -- Chip Salzenberg <chip@valinux.com>, May 2000
 21  *
 22  *  Ported DHCP support from 2.2.16 to 2.4.0-test4
 23  *              -- Eric Biederman <ebiederman@lnxi.com>, 30 Aug 2000
 24  *
 25  *  Merged changes from 2.2.19 into 2.4.3
 26  *              -- Eric Biederman <ebiederman@lnxi.com>, 22 April Aug 2001
 27  *
 28  *  Multiple Nameservers in /proc/net/pnp
 29  *              --  Josef Siemes <jsiemes@web.de>, Aug 2002
 30  */
 31 
 32 #include <linux/types.h>
 33 #include <linux/string.h>
 34 #include <linux/kernel.h>
 35 #include <linux/jiffies.h>
 36 #include <linux/random.h>
 37 #include <linux/init.h>
 38 #include <linux/utsname.h>
 39 #include <linux/in.h>
 40 #include <linux/if.h>
 41 #include <linux/inet.h>
 42 #include <linux/inetdevice.h>
 43 #include <linux/netdevice.h>
 44 #include <linux/if_arp.h>
 45 #include <linux/skbuff.h>
 46 #include <linux/ip.h>
 47 #include <linux/socket.h>
 48 #include <linux/route.h>
 49 #include <linux/udp.h>
 50 #include <linux/proc_fs.h>
 51 #include <linux/seq_file.h>
 52 #include <linux/major.h>
 53 #include <linux/root_dev.h>
 54 #include <linux/delay.h>
 55 #include <linux/nfs_fs.h>
 56 #include <linux/slab.h>
 57 #include <linux/export.h>
 58 #include <net/net_namespace.h>
 59 #include <net/arp.h>
 60 #include <net/ip.h>
 61 #include <net/ipconfig.h>
 62 #include <net/route.h>
 63 
 64 #include <asm/uaccess.h>
 65 #include <net/checksum.h>
 66 #include <asm/processor.h>
 67 
 68 #if defined(CONFIG_IP_PNP_DHCP)
 69 #define IPCONFIG_DHCP
 70 #endif
 71 #if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_DHCP)
 72 #define IPCONFIG_BOOTP
 73 #endif
 74 #if defined(CONFIG_IP_PNP_RARP)
 75 #define IPCONFIG_RARP
 76 #endif
 77 #if defined(IPCONFIG_BOOTP) || defined(IPCONFIG_RARP)
 78 #define IPCONFIG_DYNAMIC
 79 #endif
 80 
 81 /* Define the friendly delay before and after opening net devices */
 82 #define CONF_POST_OPEN          10      /* After opening: 10 msecs */
 83 #define CONF_CARRIER_TIMEOUT    120000  /* Wait for carrier timeout */
 84 
 85 /* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */
 86 #define CONF_OPEN_RETRIES       2       /* (Re)open devices twice */
 87 #define CONF_SEND_RETRIES       6       /* Send six requests per open */
 88 #define CONF_INTER_TIMEOUT      (HZ)    /* Inter-device timeout: 1 second */
 89 #define CONF_BASE_TIMEOUT       (HZ*2)  /* Initial timeout: 2 seconds */
 90 #define CONF_TIMEOUT_RANDOM     (HZ)    /* Maximum amount of randomization */
 91 #define CONF_TIMEOUT_MULT       *7/4    /* Rate of timeout growth */
 92 #define CONF_TIMEOUT_MAX        (HZ*30) /* Maximum allowed timeout */
 93 #define CONF_NAMESERVERS_MAX   3       /* Maximum number of nameservers
 94                                            - '3' from resolv.h */
 95 
 96 #define NONE cpu_to_be32(INADDR_NONE)
 97 #define ANY cpu_to_be32(INADDR_ANY)
 98 
 99 /*
100  * Public IP configuration
101  */
102 
103 /* This is used by platforms which might be able to set the ipconfig
104  * variables using firmware environment vars.  If this is set, it will
105  * ignore such firmware variables.
106  */
107 int ic_set_manually __initdata = 0;             /* IPconfig parameters set manually */
108 
109 static int ic_enable __initdata;                /* IP config enabled? */
110 
111 /* Protocol choice */
112 int ic_proto_enabled __initdata = 0
113 #ifdef IPCONFIG_BOOTP
114                         | IC_BOOTP
115 #endif
116 #ifdef CONFIG_IP_PNP_DHCP
117                         | IC_USE_DHCP
118 #endif
119 #ifdef IPCONFIG_RARP
120                         | IC_RARP
121 #endif
122                         ;
123 
124 static int ic_host_name_set __initdata; /* Host name set by us? */
125 
126 __be32 ic_myaddr = NONE;                /* My IP address */
127 static __be32 ic_netmask = NONE;        /* Netmask for local subnet */
128 __be32 ic_gateway = NONE;       /* Gateway IP address */
129 
130 __be32 ic_addrservaddr = NONE;  /* IP Address of the IP addresses'server */
131 
132 __be32 ic_servaddr = NONE;      /* Boot server IP address */
133 
134 __be32 root_server_addr = NONE; /* Address of NFS server */
135 u8 root_server_path[256] = { 0, };      /* Path to mount as root */
136 
137 /* vendor class identifier */
138 static char vendor_class_identifier[253] __initdata;
139 
140 #if defined(CONFIG_IP_PNP_DHCP)
141 static char dhcp_client_identifier[253] __initdata;
142 #endif
143 
144 /* Persistent data: */
145 
146 #ifdef IPCONFIG_DYNAMIC
147 static int ic_proto_used;                       /* Protocol used, if any */
148 #else
149 #define ic_proto_used 0
150 #endif
151 static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */
152 static u8 ic_domain[64];                /* DNS (not NIS) domain name */
153 
154 /*
155  * Private state.
156  */
157 
158 /* Name of user-selected boot device */
159 static char user_dev_name[IFNAMSIZ] __initdata = { 0, };
160 
161 /* Protocols supported by available interfaces */
162 static int ic_proto_have_if __initdata;
163 
164 /* MTU for boot device */
165 static int ic_dev_mtu __initdata;
166 
167 #ifdef IPCONFIG_DYNAMIC
168 static DEFINE_SPINLOCK(ic_recv_lock);
169 static volatile int ic_got_reply __initdata;    /* Proto(s) that replied */
170 #endif
171 #ifdef IPCONFIG_DHCP
172 static int ic_dhcp_msgtype __initdata;  /* DHCP msg type received */
173 #endif
174 
175 
176 /*
177  *      Network devices
178  */
179 
180 struct ic_device {
181         struct ic_device *next;
182         struct net_device *dev;
183         unsigned short flags;
184         short able;
185         __be32 xid;
186 };
187 
188 static struct ic_device *ic_first_dev __initdata;       /* List of open device */
189 static struct net_device *ic_dev __initdata;            /* Selected device */
190 
191 static bool __init ic_is_init_dev(struct net_device *dev)
192 {
193         if (dev->flags & IFF_LOOPBACK)
194                 return false;
195         return user_dev_name[0] ? !strcmp(dev->name, user_dev_name) :
196             (!(dev->flags & IFF_LOOPBACK) &&
197              (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) &&
198              strncmp(dev->name, "dummy", 5));
199 }
200 
201 static int __init ic_open_devs(void)
202 {
203         struct ic_device *d, **last;
204         struct net_device *dev;
205         unsigned short oflags;
206         unsigned long start, next_msg;
207 
208         last = &ic_first_dev;
209         rtnl_lock();
210 
211         /* bring loopback and DSA master network devices up first */
212         for_each_netdev(&init_net, dev) {
213                 if (!(dev->flags & IFF_LOOPBACK) && !netdev_uses_dsa(dev))
214                         continue;
215                 if (dev_change_flags(dev, dev->flags | IFF_UP) < 0)
216                         pr_err("IP-Config: Failed to open %s\n", dev->name);
217         }
218 
219         for_each_netdev(&init_net, dev) {
220                 if (ic_is_init_dev(dev)) {
221                         int able = 0;
222                         if (dev->mtu >= 364)
223                                 able |= IC_BOOTP;
224                         else
225                                 pr_warn("DHCP/BOOTP: Ignoring device %s, MTU %d too small\n",
226                                         dev->name, dev->mtu);
227                         if (!(dev->flags & IFF_NOARP))
228                                 able |= IC_RARP;
229                         able &= ic_proto_enabled;
230                         if (ic_proto_enabled && !able)
231                                 continue;
232                         oflags = dev->flags;
233                         if (dev_change_flags(dev, oflags | IFF_UP) < 0) {
234                                 pr_err("IP-Config: Failed to open %s\n",
235                                        dev->name);
236                                 continue;
237                         }
238                         if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) {
239                                 rtnl_unlock();
240                                 return -ENOMEM;
241                         }
242                         d->dev = dev;
243                         *last = d;
244                         last = &d->next;
245                         d->flags = oflags;
246                         d->able = able;
247                         if (able & IC_BOOTP)
248                                 get_random_bytes(&d->xid, sizeof(__be32));
249                         else
250                                 d->xid = 0;
251                         ic_proto_have_if |= able;
252                         pr_debug("IP-Config: %s UP (able=%d, xid=%08x)\n",
253                                  dev->name, able, d->xid);
254                 }
255         }
256 
257         /* no point in waiting if we could not bring up at least one device */
258         if (!ic_first_dev)
259                 goto have_carrier;
260 
261         /* wait for a carrier on at least one device */
262         start = jiffies;
263         next_msg = start + msecs_to_jiffies(CONF_CARRIER_TIMEOUT/12);
264         while (time_before(jiffies, start +
265                            msecs_to_jiffies(CONF_CARRIER_TIMEOUT))) {
266                 int wait, elapsed;
267 
268                 for_each_netdev(&init_net, dev)
269                         if (ic_is_init_dev(dev) && netif_carrier_ok(dev))
270                                 goto have_carrier;
271 
272                 msleep(1);
273 
274                 if (time_before(jiffies, next_msg))
275                         continue;
276 
277                 elapsed = jiffies_to_msecs(jiffies - start);
278                 wait = (CONF_CARRIER_TIMEOUT - elapsed + 500)/1000;
279                 pr_info("Waiting up to %d more seconds for network.\n", wait);
280                 next_msg = jiffies + msecs_to_jiffies(CONF_CARRIER_TIMEOUT/12);
281         }
282 have_carrier:
283         rtnl_unlock();
284 
285         *last = NULL;
286 
287         if (!ic_first_dev) {
288                 if (user_dev_name[0])
289                         pr_err("IP-Config: Device `%s' not found\n",
290                                user_dev_name);
291                 else
292                         pr_err("IP-Config: No network devices available\n");
293                 return -ENODEV;
294         }
295         return 0;
296 }
297 
298 static void __init ic_close_devs(void)
299 {
300         struct ic_device *d, *next;
301         struct net_device *dev;
302 
303         rtnl_lock();
304         next = ic_first_dev;
305         while ((d = next)) {
306                 next = d->next;
307                 dev = d->dev;
308                 if (dev != ic_dev && !netdev_uses_dsa(dev)) {
309                         pr_debug("IP-Config: Downing %s\n", dev->name);
310                         dev_change_flags(dev, d->flags);
311                 }
312                 kfree(d);
313         }
314         rtnl_unlock();
315 }
316 
317 /*
318  *      Interface to various network functions.
319  */
320 
321 static inline void
322 set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port)
323 {
324         sin->sin_family = AF_INET;
325         sin->sin_addr.s_addr = addr;
326         sin->sin_port = port;
327 }
328 
329 static int __init ic_devinet_ioctl(unsigned int cmd, struct ifreq *arg)
330 {
331         int res;
332 
333         mm_segment_t oldfs = get_fs();
334         set_fs(get_ds());
335         res = devinet_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
336         set_fs(oldfs);
337         return res;
338 }
339 
340 static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg)
341 {
342         int res;
343 
344         mm_segment_t oldfs = get_fs();
345         set_fs(get_ds());
346         res = dev_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
347         set_fs(oldfs);
348         return res;
349 }
350 
351 static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg)
352 {
353         int res;
354 
355         mm_segment_t oldfs = get_fs();
356         set_fs(get_ds());
357         res = ip_rt_ioctl(&init_net, cmd, (void __user *) arg);
358         set_fs(oldfs);
359         return res;
360 }
361 
362 /*
363  *      Set up interface addresses and routes.
364  */
365 
366 static int __init ic_setup_if(void)
367 {
368         struct ifreq ir;
369         struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr;
370         int err;
371 
372         memset(&ir, 0, sizeof(ir));
373         strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name);
374         set_sockaddr(sin, ic_myaddr, 0);
375         if ((err = ic_devinet_ioctl(SIOCSIFADDR, &ir)) < 0) {
376                 pr_err("IP-Config: Unable to set interface address (%d)\n",
377                        err);
378                 return -1;
379         }
380         set_sockaddr(sin, ic_netmask, 0);
381         if ((err = ic_devinet_ioctl(SIOCSIFNETMASK, &ir)) < 0) {
382                 pr_err("IP-Config: Unable to set interface netmask (%d)\n",
383                        err);
384                 return -1;
385         }
386         set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0);
387         if ((err = ic_devinet_ioctl(SIOCSIFBRDADDR, &ir)) < 0) {
388                 pr_err("IP-Config: Unable to set interface broadcast address (%d)\n",
389                        err);
390                 return -1;
391         }
392         /* Handle the case where we need non-standard MTU on the boot link (a network
393          * using jumbo frames, for instance).  If we can't set the mtu, don't error
394          * out, we'll try to muddle along.
395          */
396         if (ic_dev_mtu != 0) {
397                 strcpy(ir.ifr_name, ic_dev->name);
398                 ir.ifr_mtu = ic_dev_mtu;
399                 if ((err = ic_dev_ioctl(SIOCSIFMTU, &ir)) < 0)
400                         pr_err("IP-Config: Unable to set interface mtu to %d (%d)\n",
401                                ic_dev_mtu, err);
402         }
403         return 0;
404 }
405 
406 static int __init ic_setup_routes(void)
407 {
408         /* No need to setup device routes, only the default route... */
409 
410         if (ic_gateway != NONE) {
411                 struct rtentry rm;
412                 int err;
413 
414                 memset(&rm, 0, sizeof(rm));
415                 if ((ic_gateway ^ ic_myaddr) & ic_netmask) {
416                         pr_err("IP-Config: Gateway not on directly connected network\n");
417                         return -1;
418                 }
419                 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0);
420                 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0);
421                 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0);
422                 rm.rt_flags = RTF_UP | RTF_GATEWAY;
423                 if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) {
424                         pr_err("IP-Config: Cannot add default route (%d)\n",
425                                err);
426                         return -1;
427                 }
428         }
429 
430         return 0;
431 }
432 
433 /*
434  *      Fill in default values for all missing parameters.
435  */
436 
437 static int __init ic_defaults(void)
438 {
439         /*
440          *      At this point we have no userspace running so need not
441          *      claim locks on system_utsname
442          */
443 
444         if (!ic_host_name_set)
445                 sprintf(init_utsname()->nodename, "%pI4", &ic_myaddr);
446 
447         if (root_server_addr == NONE)
448                 root_server_addr = ic_servaddr;
449 
450         if (ic_netmask == NONE) {
451                 if (IN_CLASSA(ntohl(ic_myaddr)))
452                         ic_netmask = htonl(IN_CLASSA_NET);
453                 else if (IN_CLASSB(ntohl(ic_myaddr)))
454                         ic_netmask = htonl(IN_CLASSB_NET);
455                 else if (IN_CLASSC(ntohl(ic_myaddr)))
456                         ic_netmask = htonl(IN_CLASSC_NET);
457                 else {
458                         pr_err("IP-Config: Unable to guess netmask for address %pI4\n",
459                                &ic_myaddr);
460                         return -1;
461                 }
462                 pr_notice("IP-Config: Guessing netmask %pI4\n",
463                           &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         skb = skb_share_check(skb, GFP_ATOMIC);
508         if (!skb)
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         rarp_ptr += dev->addr_len;
554         memcpy(&sip, rarp_ptr, 4);
555         rarp_ptr += 4;
556         tha = rarp_ptr;
557         rarp_ptr += dev->addr_len;
558         memcpy(&tip, rarp_ptr, 4);
559 
560         /* Discard packets which are not meant for us. */
561         if (memcmp(tha, dev->dev_addr, dev->addr_len))
562                 goto drop_unlock;
563 
564         /* Discard packets which are not from specified server. */
565         if (ic_servaddr != NONE && ic_servaddr != sip)
566                 goto drop_unlock;
567 
568         /* We have a winner! */
569         ic_dev = dev;
570         if (ic_myaddr == NONE)
571                 ic_myaddr = tip;
572         ic_servaddr = sip;
573         ic_addrservaddr = sip;
574         ic_got_reply = IC_RARP;
575 
576 drop_unlock:
577         /* Show's over.  Nothing to see here.  */
578         spin_unlock(&ic_recv_lock);
579 
580 drop:
581         /* Throw the packet out. */
582         kfree_skb(skb);
583         return 0;
584 }
585 
586 
587 /*
588  *  Send RARP request packet over a single interface.
589  */
590 static void __init ic_rarp_send_if(struct ic_device *d)
591 {
592         struct net_device *dev = d->dev;
593         arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL,
594                  dev->dev_addr, dev->dev_addr);
595 }
596 #endif
597 
598 /*
599  *  Predefine Nameservers
600  */
601 static inline void __init ic_nameservers_predef(void)
602 {
603         int i;
604 
605         for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
606                 ic_nameservers[i] = NONE;
607 }
608 
609 /*
610  *      DHCP/BOOTP support.
611  */
612 
613 #ifdef IPCONFIG_BOOTP
614 
615 struct bootp_pkt {              /* BOOTP packet format */
616         struct iphdr iph;       /* IP header */
617         struct udphdr udph;     /* UDP header */
618         u8 op;                  /* 1=request, 2=reply */
619         u8 htype;               /* HW address type */
620         u8 hlen;                /* HW address length */
621         u8 hops;                /* Used only by gateways */
622         __be32 xid;             /* Transaction ID */
623         __be16 secs;            /* Seconds since we started */
624         __be16 flags;           /* Just what it says */
625         __be32 client_ip;               /* Client's IP address if known */
626         __be32 your_ip;         /* Assigned IP address */
627         __be32 server_ip;               /* (Next, e.g. NFS) Server's IP address */
628         __be32 relay_ip;                /* IP address of BOOTP relay */
629         u8 hw_addr[16];         /* Client's HW address */
630         u8 serv_name[64];       /* Server host name */
631         u8 boot_file[128];      /* Name of boot file */
632         u8 exten[312];          /* DHCP options / BOOTP vendor extensions */
633 };
634 
635 /* packet ops */
636 #define BOOTP_REQUEST   1
637 #define BOOTP_REPLY     2
638 
639 /* DHCP message types */
640 #define DHCPDISCOVER    1
641 #define DHCPOFFER       2
642 #define DHCPREQUEST     3
643 #define DHCPDECLINE     4
644 #define DHCPACK         5
645 #define DHCPNAK         6
646 #define DHCPRELEASE     7
647 #define DHCPINFORM      8
648 
649 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
650 
651 static struct packet_type bootp_packet_type __initdata = {
652         .type = cpu_to_be16(ETH_P_IP),
653         .func = ic_bootp_recv,
654 };
655 
656 static __be32 ic_dev_xid;               /* Device under configuration */
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         pr_debug("DHCP: Sending message type %d\n", mt);
675 
676         memcpy(e, ic_bootp_cookie, 4);  /* RFC1048 Magic Cookie */
677         e += 4;
678 
679         *e++ = 53;              /* DHCP message type */
680         *e++ = 1;
681         *e++ = mt;
682 
683         if (mt == DHCPREQUEST) {
684                 *e++ = 54;      /* Server ID (IP address) */
685                 *e++ = 4;
686                 memcpy(e, &ic_servaddr, 4);
687                 e += 4;
688 
689                 *e++ = 50;      /* Requested IP address */
690                 *e++ = 4;
691                 memcpy(e, &ic_myaddr, 4);
692                 e += 4;
693         }
694 
695         /* always? */
696         {
697                 static const u8 ic_req_params[] = {
698                         1,      /* Subnet mask */
699                         3,      /* Default gateway */
700                         6,      /* DNS server */
701                         12,     /* Host name */
702                         15,     /* Domain name */
703                         17,     /* Boot path */
704                         26,     /* MTU */
705                         40,     /* NIS domain name */
706                 };
707 
708                 *e++ = 55;      /* Parameter request list */
709                 *e++ = sizeof(ic_req_params);
710                 memcpy(e, ic_req_params, sizeof(ic_req_params));
711                 e += sizeof(ic_req_params);
712 
713                 if (ic_host_name_set) {
714                         *e++ = 12;      /* host-name */
715                         len = strlen(utsname()->nodename);
716                         *e++ = len;
717                         memcpy(e, utsname()->nodename, len);
718                         e += len;
719                 }
720                 if (*vendor_class_identifier) {
721                         pr_info("DHCP: sending class identifier \"%s\"\n",
722                                 vendor_class_identifier);
723                         *e++ = 60;      /* Class-identifier */
724                         len = strlen(vendor_class_identifier);
725                         *e++ = len;
726                         memcpy(e, vendor_class_identifier, len);
727                         e += len;
728                 }
729                 len = strlen(dhcp_client_identifier + 1);
730                 /* the minimum length of identifier is 2, include 1 byte type,
731                  * and can not be larger than the length of options
732                  */
733                 if (len >= 1 && len < 312 - (e - options) - 1) {
734                         *e++ = 61;
735                         *e++ = len + 1;
736                         memcpy(e, dhcp_client_identifier, len + 1);
737                         e += len + 1;
738                 }
739         }
740 
741         *e++ = 255;     /* End of the list */
742 }
743 
744 #endif /* IPCONFIG_DHCP */
745 
746 static void __init ic_bootp_init_ext(u8 *e)
747 {
748         memcpy(e, ic_bootp_cookie, 4);  /* RFC1048 Magic Cookie */
749         e += 4;
750         *e++ = 1;               /* Subnet mask request */
751         *e++ = 4;
752         e += 4;
753         *e++ = 3;               /* Default gateway request */
754         *e++ = 4;
755         e += 4;
756         *e++ = 5;               /* Name server request */
757         *e++ = 8;
758         e += 8;
759         *e++ = 12;              /* Host name request */
760         *e++ = 32;
761         e += 32;
762         *e++ = 40;              /* NIS Domain name request */
763         *e++ = 32;
764         e += 32;
765         *e++ = 17;              /* Boot path */
766         *e++ = 40;
767         e += 40;
768 
769         *e++ = 57;              /* set extension buffer size for reply */
770         *e++ = 2;
771         *e++ = 1;               /* 128+236+8+20+14, see dhcpd sources */
772         *e++ = 150;
773 
774         *e++ = 255;             /* End of the list */
775 }
776 
777 
778 /*
779  *  Initialize the DHCP/BOOTP mechanism.
780  */
781 static inline void __init ic_bootp_init(void)
782 {
783         ic_nameservers_predef();
784 
785         dev_add_pack(&bootp_packet_type);
786 }
787 
788 
789 /*
790  *  DHCP/BOOTP cleanup.
791  */
792 static inline void __init ic_bootp_cleanup(void)
793 {
794         dev_remove_pack(&bootp_packet_type);
795 }
796 
797 
798 /*
799  *  Send DHCP/BOOTP request to single interface.
800  */
801 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff)
802 {
803         struct net_device *dev = d->dev;
804         struct sk_buff *skb;
805         struct bootp_pkt *b;
806         struct iphdr *h;
807         int hlen = LL_RESERVED_SPACE(dev);
808         int tlen = dev->needed_tailroom;
809 
810         /* Allocate packet */
811         skb = alloc_skb(sizeof(struct bootp_pkt) + hlen + tlen + 15,
812                         GFP_KERNEL);
813         if (!skb)
814                 return;
815         skb_reserve(skb, hlen);
816         b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt));
817         memset(b, 0, sizeof(struct bootp_pkt));
818 
819         /* Construct IP header */
820         skb_reset_network_header(skb);
821         h = ip_hdr(skb);
822         h->version = 4;
823         h->ihl = 5;
824         h->tot_len = htons(sizeof(struct bootp_pkt));
825         h->frag_off = htons(IP_DF);
826         h->ttl = 64;
827         h->protocol = IPPROTO_UDP;
828         h->daddr = htonl(INADDR_BROADCAST);
829         h->check = ip_fast_csum((unsigned char *) h, h->ihl);
830 
831         /* Construct UDP header */
832         b->udph.source = htons(68);
833         b->udph.dest = htons(67);
834         b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr));
835         /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */
836 
837         /* Construct DHCP/BOOTP header */
838         b->op = BOOTP_REQUEST;
839         if (dev->type < 256) /* check for false types */
840                 b->htype = dev->type;
841         else if (dev->type == ARPHRD_FDDI)
842                 b->htype = ARPHRD_ETHER;
843         else {
844                 pr_warn("Unknown ARP type 0x%04x for device %s\n", dev->type,
845                         dev->name);
846                 b->htype = dev->type; /* can cause undefined behavior */
847         }
848 
849         /* server_ip and your_ip address are both already zero per RFC2131 */
850         b->hlen = dev->addr_len;
851         memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
852         b->secs = htons(jiffies_diff / HZ);
853         b->xid = d->xid;
854 
855         /* add DHCP options or BOOTP extensions */
856 #ifdef IPCONFIG_DHCP
857         if (ic_proto_enabled & IC_USE_DHCP)
858                 ic_dhcp_init_options(b->exten);
859         else
860 #endif
861                 ic_bootp_init_ext(b->exten);
862 
863         /* Chain packet down the line... */
864         skb->dev = dev;
865         skb->protocol = htons(ETH_P_IP);
866         if (dev_hard_header(skb, dev, ntohs(skb->protocol),
867                             dev->broadcast, dev->dev_addr, skb->len) < 0) {
868                 kfree_skb(skb);
869                 printk("E");
870                 return;
871         }
872 
873         if (dev_queue_xmit(skb) < 0)
874                 printk("E");
875 }
876 
877 
878 /*
879  *  Copy BOOTP-supplied string if not already set.
880  */
881 static int __init ic_bootp_string(char *dest, char *src, int len, int max)
882 {
883         if (!len)
884                 return 0;
885         if (len > max-1)
886                 len = max-1;
887         memcpy(dest, src, len);
888         dest[len] = '\0';
889         return 1;
890 }
891 
892 
893 /*
894  *  Process BOOTP extensions.
895  */
896 static void __init ic_do_bootp_ext(u8 *ext)
897 {
898         u8 servers;
899         int i;
900         __be16 mtu;
901 
902         u8 *c;
903 
904         pr_debug("DHCP/BOOTP: Got extension %d:", *ext);
905         for (c=ext+2; c<ext+2+ext[1]; c++)
906                 pr_debug(" %02x", *c);
907         pr_debug("\n");
908 
909         switch (*ext++) {
910         case 1:         /* Subnet mask */
911                 if (ic_netmask == NONE)
912                         memcpy(&ic_netmask, ext+1, 4);
913                 break;
914         case 3:         /* Default gateway */
915                 if (ic_gateway == NONE)
916                         memcpy(&ic_gateway, ext+1, 4);
917                 break;
918         case 6:         /* DNS server */
919                 servers= *ext/4;
920                 if (servers > CONF_NAMESERVERS_MAX)
921                         servers = CONF_NAMESERVERS_MAX;
922                 for (i = 0; i < servers; i++) {
923                         if (ic_nameservers[i] == NONE)
924                                 memcpy(&ic_nameservers[i], ext+1+4*i, 4);
925                 }
926                 break;
927         case 12:        /* Host name */
928                 ic_bootp_string(utsname()->nodename, ext+1, *ext,
929                                 __NEW_UTS_LEN);
930                 ic_host_name_set = 1;
931                 break;
932         case 15:        /* Domain name (DNS) */
933                 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
934                 break;
935         case 17:        /* Root path */
936                 if (!root_server_path[0])
937                         ic_bootp_string(root_server_path, ext+1, *ext,
938                                         sizeof(root_server_path));
939                 break;
940         case 26:        /* Interface MTU */
941                 memcpy(&mtu, ext+1, sizeof(mtu));
942                 ic_dev_mtu = ntohs(mtu);
943                 break;
944         case 40:        /* NIS Domain name (_not_ DNS) */
945                 ic_bootp_string(utsname()->domainname, ext+1, *ext,
946                                 __NEW_UTS_LEN);
947                 break;
948         }
949 }
950 
951 
952 /*
953  *  Receive BOOTP reply.
954  */
955 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
956 {
957         struct bootp_pkt *b;
958         struct iphdr *h;
959         struct ic_device *d;
960         int len, ext_len;
961 
962         if (!net_eq(dev_net(dev), &init_net))
963                 goto drop;
964 
965         /* Perform verifications before taking the lock.  */
966         if (skb->pkt_type == PACKET_OTHERHOST)
967                 goto drop;
968 
969         skb = skb_share_check(skb, GFP_ATOMIC);
970         if (!skb)
971                 return NET_RX_DROP;
972 
973         if (!pskb_may_pull(skb,
974                            sizeof(struct iphdr) +
975                            sizeof(struct udphdr)))
976                 goto drop;
977 
978         b = (struct bootp_pkt *)skb_network_header(skb);
979         h = &b->iph;
980 
981         if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP)
982                 goto drop;
983 
984         /* Fragments are not supported */
985         if (ip_is_fragment(h)) {
986                 net_err_ratelimited("DHCP/BOOTP: Ignoring fragmented reply\n");
987                 goto drop;
988         }
989 
990         if (skb->len < ntohs(h->tot_len))
991                 goto drop;
992 
993         if (ip_fast_csum((char *) h, h->ihl))
994                 goto drop;
995 
996         if (b->udph.source != htons(67) || b->udph.dest != htons(68))
997                 goto drop;
998 
999         if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
1000                 goto drop;
1001 
1002         len = ntohs(b->udph.len) - sizeof(struct udphdr);
1003         ext_len = len - (sizeof(*b) -
1004                          sizeof(struct iphdr) -
1005                          sizeof(struct udphdr) -
1006                          sizeof(b->exten));
1007         if (ext_len < 0)
1008                 goto drop;
1009 
1010         /* Ok the front looks good, make sure we can get at the rest.  */
1011         if (!pskb_may_pull(skb, skb->len))
1012                 goto drop;
1013 
1014         b = (struct bootp_pkt *)skb_network_header(skb);
1015         h = &b->iph;
1016 
1017         /* One reply at a time, please. */
1018         spin_lock(&ic_recv_lock);
1019 
1020         /* If we already have a reply, just drop the packet */
1021         if (ic_got_reply)
1022                 goto drop_unlock;
1023 
1024         /* Find the ic_device that the packet arrived on */
1025         d = ic_first_dev;
1026         while (d && d->dev != dev)
1027                 d = d->next;
1028         if (!d)
1029                 goto drop_unlock;  /* should never happen */
1030 
1031         /* Is it a reply to our BOOTP request? */
1032         if (b->op != BOOTP_REPLY ||
1033             b->xid != d->xid) {
1034                 net_err_ratelimited("DHCP/BOOTP: Reply not for us, op[%x] xid[%x]\n",
1035                                     b->op, b->xid);
1036                 goto drop_unlock;
1037         }
1038 
1039         /* Is it a reply for the device we are configuring? */
1040         if (b->xid != ic_dev_xid) {
1041                 net_err_ratelimited("DHCP/BOOTP: Ignoring delayed packet\n");
1042                 goto drop_unlock;
1043         }
1044 
1045         /* Parse extensions */
1046         if (ext_len >= 4 &&
1047             !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */
1048                 u8 *end = (u8 *) b + ntohs(b->iph.tot_len);
1049                 u8 *ext;
1050 
1051 #ifdef IPCONFIG_DHCP
1052                 if (ic_proto_enabled & IC_USE_DHCP) {
1053                         __be32 server_id = NONE;
1054                         int mt = 0;
1055 
1056                         ext = &b->exten[4];
1057                         while (ext < end && *ext != 0xff) {
1058                                 u8 *opt = ext++;
1059                                 if (*opt == 0)  /* Padding */
1060                                         continue;
1061                                 ext += *ext + 1;
1062                                 if (ext >= end)
1063                                         break;
1064                                 switch (*opt) {
1065                                 case 53:        /* Message type */
1066                                         if (opt[1])
1067                                                 mt = opt[2];
1068                                         break;
1069                                 case 54:        /* Server ID (IP address) */
1070                                         if (opt[1] >= 4)
1071                                                 memcpy(&server_id, opt + 2, 4);
1072                                         break;
1073                                 }
1074                         }
1075 
1076                         pr_debug("DHCP: Got message type %d\n", mt);
1077 
1078                         switch (mt) {
1079                         case DHCPOFFER:
1080                                 /* While in the process of accepting one offer,
1081                                  * ignore all others.
1082                                  */
1083                                 if (ic_myaddr != NONE)
1084                                         goto drop_unlock;
1085 
1086                                 /* Let's accept that offer. */
1087                                 ic_myaddr = b->your_ip;
1088                                 ic_servaddr = server_id;
1089                                 pr_debug("DHCP: Offered address %pI4 by server %pI4\n",
1090                                          &ic_myaddr, &b->iph.saddr);
1091                                 /* The DHCP indicated server address takes
1092                                  * precedence over the bootp header one if
1093                                  * they are different.
1094                                  */
1095                                 if ((server_id != NONE) &&
1096                                     (b->server_ip != server_id))
1097                                         b->server_ip = ic_servaddr;
1098                                 break;
1099 
1100                         case DHCPACK:
1101                                 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0)
1102                                         goto drop_unlock;
1103 
1104                                 /* Yeah! */
1105                                 break;
1106 
1107                         default:
1108                                 /* Urque.  Forget it*/
1109                                 ic_myaddr = NONE;
1110                                 ic_servaddr = NONE;
1111                                 goto drop_unlock;
1112                         }
1113 
1114                         ic_dhcp_msgtype = mt;
1115 
1116                 }
1117 #endif /* IPCONFIG_DHCP */
1118 
1119                 ext = &b->exten[4];
1120                 while (ext < end && *ext != 0xff) {
1121                         u8 *opt = ext++;
1122                         if (*opt == 0)  /* Padding */
1123                                 continue;
1124                         ext += *ext + 1;
1125                         if (ext < end)
1126                                 ic_do_bootp_ext(opt);
1127                 }
1128         }
1129 
1130         /* We have a winner! */
1131         ic_dev = dev;
1132         ic_myaddr = b->your_ip;
1133         ic_servaddr = b->server_ip;
1134         ic_addrservaddr = b->iph.saddr;
1135         if (ic_gateway == NONE && b->relay_ip)
1136                 ic_gateway = b->relay_ip;
1137         if (ic_nameservers[0] == NONE)
1138                 ic_nameservers[0] = ic_servaddr;
1139         ic_got_reply = IC_BOOTP;
1140 
1141 drop_unlock:
1142         /* Show's over.  Nothing to see here.  */
1143         spin_unlock(&ic_recv_lock);
1144 
1145 drop:
1146         /* Throw the packet out. */
1147         kfree_skb(skb);
1148 
1149         return 0;
1150 }
1151 
1152 
1153 #endif
1154 
1155 
1156 /*
1157  *      Dynamic IP configuration -- DHCP, BOOTP, RARP.
1158  */
1159 
1160 #ifdef IPCONFIG_DYNAMIC
1161 
1162 static int __init ic_dynamic(void)
1163 {
1164         int retries;
1165         struct ic_device *d;
1166         unsigned long start_jiffies, timeout, jiff;
1167         int do_bootp = ic_proto_have_if & IC_BOOTP;
1168         int do_rarp = ic_proto_have_if & IC_RARP;
1169 
1170         /*
1171          * If none of DHCP/BOOTP/RARP was selected, return with an error.
1172          * This routine gets only called when some pieces of information
1173          * are missing, and without DHCP/BOOTP/RARP we are unable to get it.
1174          */
1175         if (!ic_proto_enabled) {
1176                 pr_err("IP-Config: Incomplete network configuration information\n");
1177                 return -1;
1178         }
1179 
1180 #ifdef IPCONFIG_BOOTP
1181         if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
1182                 pr_err("DHCP/BOOTP: No suitable device found\n");
1183 #endif
1184 #ifdef IPCONFIG_RARP
1185         if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)
1186                 pr_err("RARP: No suitable device found\n");
1187 #endif
1188 
1189         if (!ic_proto_have_if)
1190                 /* Error message already printed */
1191                 return -1;
1192 
1193         /*
1194          * Setup protocols
1195          */
1196 #ifdef IPCONFIG_BOOTP
1197         if (do_bootp)
1198                 ic_bootp_init();
1199 #endif
1200 #ifdef IPCONFIG_RARP
1201         if (do_rarp)
1202                 ic_rarp_init();
1203 #endif
1204 
1205         /*
1206          * Send requests and wait, until we get an answer. This loop
1207          * seems to be a terrible waste of CPU time, but actually there is
1208          * only one process running at all, so we don't need to use any
1209          * scheduler functions.
1210          * [Actually we could now, but the nothing else running note still
1211          *  applies.. - AC]
1212          */
1213         pr_notice("Sending %s%s%s requests .",
1214                   do_bootp
1215                   ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "",
1216                   (do_bootp && do_rarp) ? " and " : "",
1217                   do_rarp ? "RARP" : "");
1218 
1219         start_jiffies = jiffies;
1220         d = ic_first_dev;
1221         retries = CONF_SEND_RETRIES;
1222         get_random_bytes(&timeout, sizeof(timeout));
1223         timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned int) CONF_TIMEOUT_RANDOM);
1224         for (;;) {
1225 #ifdef IPCONFIG_BOOTP
1226                 /* Track the device we are configuring */
1227                 ic_dev_xid = d->xid;
1228 
1229                 if (do_bootp && (d->able & IC_BOOTP))
1230                         ic_bootp_send_if(d, jiffies - start_jiffies);
1231 #endif
1232 #ifdef IPCONFIG_RARP
1233                 if (do_rarp && (d->able & IC_RARP))
1234                         ic_rarp_send_if(d);
1235 #endif
1236 
1237                 jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout);
1238                 while (time_before(jiffies, jiff) && !ic_got_reply)
1239                         schedule_timeout_uninterruptible(1);
1240 #ifdef IPCONFIG_DHCP
1241                 /* DHCP isn't done until we get a DHCPACK. */
1242                 if ((ic_got_reply & IC_BOOTP) &&
1243                     (ic_proto_enabled & IC_USE_DHCP) &&
1244                     ic_dhcp_msgtype != DHCPACK) {
1245                         ic_got_reply = 0;
1246                         pr_cont(",");
1247                         continue;
1248                 }
1249 #endif /* IPCONFIG_DHCP */
1250 
1251                 if (ic_got_reply) {
1252                         pr_cont(" OK\n");
1253                         break;
1254                 }
1255 
1256                 if ((d = d->next))
1257                         continue;
1258 
1259                 if (! --retries) {
1260                         pr_cont(" timed out!\n");
1261                         break;
1262                 }
1263 
1264                 d = ic_first_dev;
1265 
1266                 timeout = timeout CONF_TIMEOUT_MULT;
1267                 if (timeout > CONF_TIMEOUT_MAX)
1268                         timeout = CONF_TIMEOUT_MAX;
1269 
1270                 pr_cont(".");
1271         }
1272 
1273 #ifdef IPCONFIG_BOOTP
1274         if (do_bootp)
1275                 ic_bootp_cleanup();
1276 #endif
1277 #ifdef IPCONFIG_RARP
1278         if (do_rarp)
1279                 ic_rarp_cleanup();
1280 #endif
1281 
1282         if (!ic_got_reply) {
1283                 ic_myaddr = NONE;
1284                 return -1;
1285         }
1286 
1287         pr_info("IP-Config: Got %s answer from %pI4, my address is %pI4\n",
1288                 ((ic_got_reply & IC_RARP) ? "RARP"
1289                 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),
1290                 &ic_addrservaddr, &ic_myaddr);
1291 
1292         return 0;
1293 }
1294 
1295 #endif /* IPCONFIG_DYNAMIC */
1296 
1297 #ifdef CONFIG_PROC_FS
1298 
1299 static int pnp_seq_show(struct seq_file *seq, void *v)
1300 {
1301         int i;
1302 
1303         if (ic_proto_used & IC_PROTO)
1304                 seq_printf(seq, "#PROTO: %s\n",
1305                            (ic_proto_used & IC_RARP) ? "RARP"
1306                            : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP");
1307         else
1308                 seq_puts(seq, "#MANUAL\n");
1309 
1310         if (ic_domain[0])
1311                 seq_printf(seq,
1312                            "domain %s\n", ic_domain);
1313         for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {
1314                 if (ic_nameservers[i] != NONE)
1315                         seq_printf(seq, "nameserver %pI4\n",
1316                                    &ic_nameservers[i]);
1317         }
1318         if (ic_servaddr != NONE)
1319                 seq_printf(seq, "bootserver %pI4\n",
1320                            &ic_servaddr);
1321         return 0;
1322 }
1323 
1324 static int pnp_seq_open(struct inode *indoe, struct file *file)
1325 {
1326         return single_open(file, pnp_seq_show, NULL);
1327 }
1328 
1329 static const struct file_operations pnp_seq_fops = {
1330         .owner          = THIS_MODULE,
1331         .open           = pnp_seq_open,
1332         .read           = seq_read,
1333         .llseek         = seq_lseek,
1334         .release        = single_release,
1335 };
1336 #endif /* CONFIG_PROC_FS */
1337 
1338 /*
1339  *  Extract IP address from the parameter string if needed. Note that we
1340  *  need to have root_server_addr set _before_ IPConfig gets called as it
1341  *  can override it.
1342  */
1343 __be32 __init root_nfs_parse_addr(char *name)
1344 {
1345         __be32 addr;
1346         int octets = 0;
1347         char *cp, *cq;
1348 
1349         cp = cq = name;
1350         while (octets < 4) {
1351                 while (*cp >= '' && *cp <= '9')
1352                         cp++;
1353                 if (cp == cq || cp - cq > 3)
1354                         break;
1355                 if (*cp == '.' || octets == 3)
1356                         octets++;
1357                 if (octets < 4)
1358                         cp++;
1359                 cq = cp;
1360         }
1361         if (octets == 4 && (*cp == ':' || *cp == '\0')) {
1362                 if (*cp == ':')
1363                         *cp++ = '\0';
1364                 addr = in_aton(name);
1365                 memmove(name, cp, strlen(cp) + 1);
1366         } else
1367                 addr = NONE;
1368 
1369         return addr;
1370 }
1371 
1372 #define DEVICE_WAIT_MAX         12 /* 12 seconds */
1373 
1374 static int __init wait_for_devices(void)
1375 {
1376         int i;
1377 
1378         for (i = 0; i < DEVICE_WAIT_MAX; i++) {
1379                 struct net_device *dev;
1380                 int found = 0;
1381 
1382                 rtnl_lock();
1383                 for_each_netdev(&init_net, dev) {
1384                         if (ic_is_init_dev(dev)) {
1385                                 found = 1;
1386                                 break;
1387                         }
1388                 }
1389                 rtnl_unlock();
1390                 if (found)
1391                         return 0;
1392                 ssleep(1);
1393         }
1394         return -ENODEV;
1395 }
1396 
1397 /*
1398  *      IP Autoconfig dispatcher.
1399  */
1400 
1401 static int __init ip_auto_config(void)
1402 {
1403         __be32 addr;
1404 #ifdef IPCONFIG_DYNAMIC
1405         int retries = CONF_OPEN_RETRIES;
1406 #endif
1407         int err;
1408         unsigned int i;
1409 
1410 #ifdef CONFIG_PROC_FS
1411         proc_create("pnp", S_IRUGO, init_net.proc_net, &pnp_seq_fops);
1412 #endif /* CONFIG_PROC_FS */
1413 
1414         if (!ic_enable)
1415                 return 0;
1416 
1417         pr_debug("IP-Config: Entered.\n");
1418 #ifdef IPCONFIG_DYNAMIC
1419  try_try_again:
1420 #endif
1421         /* Wait for devices to appear */
1422         err = wait_for_devices();
1423         if (err)
1424                 return err;
1425 
1426         /* Setup all network devices */
1427         err = ic_open_devs();
1428         if (err)
1429                 return err;
1430 
1431         /* Give drivers a chance to settle */
1432         msleep(CONF_POST_OPEN);
1433 
1434         /*
1435          * If the config information is insufficient (e.g., our IP address or
1436          * IP address of the boot server is missing or we have multiple network
1437          * interfaces and no default was set), use BOOTP or RARP to get the
1438          * missing values.
1439          */
1440         if (ic_myaddr == NONE ||
1441 #ifdef CONFIG_ROOT_NFS
1442             (root_server_addr == NONE &&
1443              ic_servaddr == NONE &&
1444              ROOT_DEV == Root_NFS) ||
1445 #endif
1446             ic_first_dev->next) {
1447 #ifdef IPCONFIG_DYNAMIC
1448                 if (ic_dynamic() < 0) {
1449                         ic_close_devs();
1450 
1451                         /*
1452                          * I don't know why, but sometimes the
1453                          * eepro100 driver (at least) gets upset and
1454                          * doesn't work the first time it's opened.
1455                          * But then if you close it and reopen it, it
1456                          * works just fine.  So we need to try that at
1457                          * least once before giving up.
1458                          *
1459                          * Also, if the root will be NFS-mounted, we
1460                          * have nowhere to go if DHCP fails.  So we
1461                          * just have to keep trying forever.
1462                          *
1463                          *                              -- Chip
1464                          */
1465 #ifdef CONFIG_ROOT_NFS
1466                         if (ROOT_DEV ==  Root_NFS) {
1467                                 pr_err("IP-Config: Retrying forever (NFS root)...\n");
1468                                 goto try_try_again;
1469                         }
1470 #endif
1471 
1472                         if (--retries) {
1473                                 pr_err("IP-Config: Reopening network devices...\n");
1474                                 goto try_try_again;
1475                         }
1476 
1477                         /* Oh, well.  At least we tried. */
1478                         pr_err("IP-Config: Auto-configuration of network failed\n");
1479                         return -1;
1480                 }
1481 #else /* !DYNAMIC */
1482                 pr_err("IP-Config: Incomplete network configuration information\n");
1483                 ic_close_devs();
1484                 return -1;
1485 #endif /* IPCONFIG_DYNAMIC */
1486         } else {
1487                 /* Device selected manually or only one device -> use it */
1488                 ic_dev = ic_first_dev->dev;
1489         }
1490 
1491         addr = root_nfs_parse_addr(root_server_path);
1492         if (root_server_addr == NONE)
1493                 root_server_addr = addr;
1494 
1495         /*
1496          * Use defaults wherever applicable.
1497          */
1498         if (ic_defaults() < 0)
1499                 return -1;
1500 
1501         /*
1502          * Close all network devices except the device we've
1503          * autoconfigured and set up routes.
1504          */
1505         ic_close_devs();
1506         if (ic_setup_if() < 0 || ic_setup_routes() < 0)
1507                 return -1;
1508 
1509         /*
1510          * Record which protocol was actually used.
1511          */
1512 #ifdef IPCONFIG_DYNAMIC
1513         ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP);
1514 #endif
1515 
1516 #ifndef IPCONFIG_SILENT
1517         /*
1518          * Clue in the operator.
1519          */
1520         pr_info("IP-Config: Complete:\n");
1521 
1522         pr_info("     device=%s, hwaddr=%*phC, ipaddr=%pI4, mask=%pI4, gw=%pI4\n",
1523                 ic_dev->name, ic_dev->addr_len, ic_dev->dev_addr,
1524                 &ic_myaddr, &ic_netmask, &ic_gateway);
1525         pr_info("     host=%s, domain=%s, nis-domain=%s\n",
1526                 utsname()->nodename, ic_domain, utsname()->domainname);
1527         pr_info("     bootserver=%pI4, rootserver=%pI4, rootpath=%s",
1528                 &ic_servaddr, &root_server_addr, root_server_path);
1529         if (ic_dev_mtu)
1530                 pr_cont(", mtu=%d", ic_dev_mtu);
1531         for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
1532                 if (ic_nameservers[i] != NONE) {
1533                         pr_cont("     nameserver%u=%pI4",
1534                                 i, &ic_nameservers[i]);
1535                         break;
1536                 }
1537         for (i++; i < CONF_NAMESERVERS_MAX; i++)
1538                 if (ic_nameservers[i] != NONE)
1539                         pr_cont(", nameserver%u=%pI4", i, &ic_nameservers[i]);
1540         pr_cont("\n");
1541 #endif /* !SILENT */
1542 
1543         return 0;
1544 }
1545 
1546 late_initcall(ip_auto_config);
1547 
1548 
1549 /*
1550  *  Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
1551  *  command line parameter.  See Documentation/filesystems/nfs/nfsroot.txt.
1552  */
1553 static int __init ic_proto_name(char *name)
1554 {
1555         if (!strcmp(name, "on") || !strcmp(name, "any")) {
1556                 return 1;
1557         }
1558         if (!strcmp(name, "off") || !strcmp(name, "none")) {
1559                 return 0;
1560         }
1561 #ifdef CONFIG_IP_PNP_DHCP
1562         else if (!strncmp(name, "dhcp", 4)) {
1563                 char *client_id;
1564 
1565                 ic_proto_enabled &= ~IC_RARP;
1566                 client_id = strstr(name, "dhcp,");
1567                 if (client_id) {
1568                         char *v;
1569 
1570                         client_id = client_id + 5;
1571                         v = strchr(client_id, ',');
1572                         if (!v)
1573                                 return 1;
1574                         *v = 0;
1575                         if (kstrtou8(client_id, 0, dhcp_client_identifier))
1576                                 pr_debug("DHCP: Invalid client identifier type\n");
1577                         strncpy(dhcp_client_identifier + 1, v + 1, 251);
1578                         *v = ',';
1579                 }
1580                 return 1;
1581         }
1582 #endif
1583 #ifdef CONFIG_IP_PNP_BOOTP
1584         else if (!strcmp(name, "bootp")) {
1585                 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP);
1586                 return 1;
1587         }
1588 #endif
1589 #ifdef CONFIG_IP_PNP_RARP
1590         else if (!strcmp(name, "rarp")) {
1591                 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP);
1592                 return 1;
1593         }
1594 #endif
1595 #ifdef IPCONFIG_DYNAMIC
1596         else if (!strcmp(name, "both")) {
1597                 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */
1598                 return 1;
1599         }
1600 #endif
1601         return 0;
1602 }
1603 
1604 static int __init ip_auto_config_setup(char *addrs)
1605 {
1606         char *cp, *ip, *dp;
1607         int num = 0;
1608 
1609         ic_set_manually = 1;
1610         ic_enable = 1;
1611 
1612         /*
1613          * If any dhcp, bootp etc options are set, leave autoconfig on
1614          * and skip the below static IP processing.
1615          */
1616         if (ic_proto_name(addrs))
1617                 return 1;
1618 
1619         /* If no static IP is given, turn off autoconfig and bail.  */
1620         if (*addrs == 0 ||
1621             strcmp(addrs, "off") == 0 ||
1622             strcmp(addrs, "none") == 0) {
1623                 ic_enable = 0;
1624                 return 1;
1625         }
1626 
1627         ic_nameservers_predef();
1628 
1629         /* Parse string for static IP assignment.  */
1630         ip = addrs;
1631         while (ip && *ip) {
1632                 if ((cp = strchr(ip, ':')))
1633                         *cp++ = '\0';
1634                 if (strlen(ip) > 0) {
1635                         pr_debug("IP-Config: Parameter #%d: `%s'\n", num, ip);
1636                         switch (num) {
1637                         case 0:
1638                                 if ((ic_myaddr = in_aton(ip)) == ANY)
1639                                         ic_myaddr = NONE;
1640                                 break;
1641                         case 1:
1642                                 if ((ic_servaddr = in_aton(ip)) == ANY)
1643                                         ic_servaddr = NONE;
1644                                 break;
1645                         case 2:
1646                                 if ((ic_gateway = in_aton(ip)) == ANY)
1647                                         ic_gateway = NONE;
1648                                 break;
1649                         case 3:
1650                                 if ((ic_netmask = in_aton(ip)) == ANY)
1651                                         ic_netmask = NONE;
1652                                 break;
1653                         case 4:
1654                                 if ((dp = strchr(ip, '.'))) {
1655                                         *dp++ = '\0';
1656                                         strlcpy(utsname()->domainname, dp,
1657                                                 sizeof(utsname()->domainname));
1658                                 }
1659                                 strlcpy(utsname()->nodename, ip,
1660                                         sizeof(utsname()->nodename));
1661                                 ic_host_name_set = 1;
1662                                 break;
1663                         case 5:
1664                                 strlcpy(user_dev_name, ip, sizeof(user_dev_name));
1665                                 break;
1666                         case 6:
1667                                 if (ic_proto_name(ip) == 0 &&
1668                                     ic_myaddr == NONE) {
1669                                         ic_enable = 0;
1670                                 }
1671                                 break;
1672                         case 7:
1673                                 if (CONF_NAMESERVERS_MAX >= 1) {
1674                                         ic_nameservers[0] = in_aton(ip);
1675                                         if (ic_nameservers[0] == ANY)
1676                                                 ic_nameservers[0] = NONE;
1677                                 }
1678                                 break;
1679                         case 8:
1680                                 if (CONF_NAMESERVERS_MAX >= 2) {
1681                                         ic_nameservers[1] = in_aton(ip);
1682                                         if (ic_nameservers[1] == ANY)
1683                                                 ic_nameservers[1] = NONE;
1684                                 }
1685                                 break;
1686                         }
1687                 }
1688                 ip = cp;
1689                 num++;
1690         }
1691 
1692         return 1;
1693 }
1694 __setup("ip=", ip_auto_config_setup);
1695 
1696 static int __init nfsaddrs_config_setup(char *addrs)
1697 {
1698         return ip_auto_config_setup(addrs);
1699 }
1700 __setup("nfsaddrs=", nfsaddrs_config_setup);
1701 
1702 static int __init vendor_class_identifier_setup(char *addrs)
1703 {
1704         if (strlcpy(vendor_class_identifier, addrs,
1705                     sizeof(vendor_class_identifier))
1706             >= sizeof(vendor_class_identifier))
1707                 pr_warn("DHCP: vendorclass too long, truncated to \"%s\"\n",
1708                         vendor_class_identifier);
1709         return 1;
1710 }
1711 __setup("dhcpclass=", vendor_class_identifier_setup);
1712 

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