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

Version: ~ [ linux-5.0-rc6 ] ~ [ linux-4.20.10 ] ~ [ linux-4.19.23 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.101 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.158 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.174 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.134 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.63 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.39.4 ] ~ [ linux-2.6.38.8 ] ~ [ linux-2.6.37.6 ] ~ [ linux-2.6.36.4 ] ~ [ linux-2.6.35.14 ] ~ [ linux-2.6.34.15 ] ~ [ linux-2.6.33.20 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /*
  2  *  $Id: ipconfig.c,v 1.46 2002/02/01 22:01:04 davem Exp $
  3  *
  4  *  Automatic Configuration of IP -- use DHCP, BOOTP, RARP, or
  5  *  user-supplied information to configure own IP address and routes.
  6  *
  7  *  Copyright (C) 1996-1998 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
  8  *
  9  *  Derived from network configuration code in fs/nfs/nfsroot.c,
 10  *  originally Copyright (C) 1995, 1996 Gero Kuhlmann and me.
 11  *
 12  *  BOOTP rewritten to construct and analyse packets itself instead
 13  *  of misusing the IP layer. num_bugs_causing_wrong_arp_replies--;
 14  *                                           -- MJ, December 1998
 15  *  
 16  *  Fixed ip_auto_config_setup calling at startup in the new "Linker Magic"
 17  *  initialization scheme.
 18  *      - Arnaldo Carvalho de Melo <acme@conectiva.com.br>, 08/11/1999
 19  *
 20  *  DHCP support added.  To users this looks like a whole separate
 21  *  protocol, but we know it's just a bag on the side of BOOTP.
 22  *              -- Chip Salzenberg <chip@valinux.com>, May 2000
 23  *
 24  *  Ported DHCP support from 2.2.16 to 2.4.0-test4
 25  *              -- Eric Biederman <ebiederman@lnxi.com>, 30 Aug 2000
 26  *
 27  *  Merged changes from 2.2.19 into 2.4.3
 28  *              -- Eric Biederman <ebiederman@lnxi.com>, 22 April Aug 2001
 29  *
 30  *  Multiple Nameservers in /proc/net/pnp
 31  *              --  Josef Siemes <jsiemes@web.de>, Aug 2002
 32  */
 33 
 34 #include <linux/config.h>
 35 #include <linux/types.h>
 36 #include <linux/string.h>
 37 #include <linux/kernel.h>
 38 #include <linux/jiffies.h>
 39 #include <linux/random.h>
 40 #include <linux/init.h>
 41 #include <linux/utsname.h>
 42 #include <linux/in.h>
 43 #include <linux/if.h>
 44 #include <linux/inet.h>
 45 #include <linux/netdevice.h>
 46 #include <linux/if_arp.h>
 47 #include <linux/skbuff.h>
 48 #include <linux/ip.h>
 49 #include <linux/socket.h>
 50 #include <linux/route.h>
 51 #include <linux/udp.h>
 52 #include <linux/proc_fs.h>
 53 #include <linux/seq_file.h>
 54 #include <linux/major.h>
 55 #include <linux/root_dev.h>
 56 #include <net/arp.h>
 57 #include <net/ip.h>
 58 #include <net/ipconfig.h>
 59 
 60 #include <asm/uaccess.h>
 61 #include <net/checksum.h>
 62 #include <asm/processor.h>
 63 
 64 /* Define this to allow debugging output */
 65 #undef IPCONFIG_DEBUG
 66 
 67 #ifdef IPCONFIG_DEBUG
 68 #define DBG(x) printk x
 69 #else
 70 #define DBG(x) do { } while(0)
 71 #endif
 72 
 73 #if defined(CONFIG_IP_PNP_DHCP)
 74 #define IPCONFIG_DHCP
 75 #endif
 76 #if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_DHCP)
 77 #define IPCONFIG_BOOTP
 78 #endif
 79 #if defined(CONFIG_IP_PNP_RARP)
 80 #define IPCONFIG_RARP
 81 #endif
 82 #if defined(IPCONFIG_BOOTP) || defined(IPCONFIG_RARP)
 83 #define IPCONFIG_DYNAMIC
 84 #endif
 85 
 86 /* Define the friendly delay before and after opening net devices */
 87 #define CONF_PRE_OPEN           (HZ/2)  /* Before opening: 1/2 second */
 88 #define CONF_POST_OPEN          (1*HZ)  /* After opening: 1 second */
 89 
 90 /* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */
 91 #define CONF_OPEN_RETRIES       2       /* (Re)open devices twice */
 92 #define CONF_SEND_RETRIES       6       /* Send six requests per open */
 93 #define CONF_INTER_TIMEOUT      (HZ/2)  /* Inter-device timeout: 1/2 second */
 94 #define CONF_BASE_TIMEOUT       (HZ*2)  /* Initial timeout: 2 seconds */
 95 #define CONF_TIMEOUT_RANDOM     (HZ)    /* Maximum amount of randomization */
 96 #define CONF_TIMEOUT_MULT       *7/4    /* Rate of timeout growth */
 97 #define CONF_TIMEOUT_MAX        (HZ*30) /* Maximum allowed timeout */
 98 #define CONF_NAMESERVERS_MAX   3       /* Maximum number of nameservers  
 99                                            - '3' from resolv.h */
100 
101 
102 /*
103  * Public IP configuration
104  */
105 
106 /* This is used by platforms which might be able to set the ipconfig
107  * variables using firmware environment vars.  If this is set, it will
108  * ignore such firmware variables.
109  */
110 int ic_set_manually __initdata = 0;             /* IPconfig parameters set manually */
111 
112 int ic_enable __initdata = 0;                   /* IP config enabled? */
113 
114 /* Protocol choice */
115 int ic_proto_enabled __initdata = 0
116 #ifdef IPCONFIG_BOOTP
117                         | IC_BOOTP
118 #endif
119 #ifdef CONFIG_IP_PNP_DHCP
120                         | IC_USE_DHCP
121 #endif
122 #ifdef IPCONFIG_RARP
123                         | IC_RARP
124 #endif
125                         ;
126 
127 int ic_host_name_set __initdata = 0;            /* Host name set by us? */
128 
129 u32 ic_myaddr = INADDR_NONE;            /* My IP address */
130 u32 ic_netmask = INADDR_NONE;   /* Netmask for local subnet */
131 u32 ic_gateway = INADDR_NONE;   /* Gateway IP address */
132 
133 u32 ic_servaddr = INADDR_NONE;  /* Boot server IP address */
134 
135 u32 root_server_addr = INADDR_NONE;     /* Address of NFS server */
136 u8 root_server_path[256] = { 0, };      /* Path to mount as root */
137 
138 /* Persistent data: */
139 
140 int ic_proto_used;                      /* Protocol used, if any */
141 u32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */
142 u8 ic_domain[64];               /* DNS (not NIS) domain name */
143 
144 /*
145  * Private state.
146  */
147 
148 /* Name of user-selected boot device */
149 static char user_dev_name[IFNAMSIZ] __initdata = { 0, };
150 
151 /* Protocols supported by available interfaces */
152 static int ic_proto_have_if __initdata = 0;
153 
154 #ifdef IPCONFIG_DYNAMIC
155 static spinlock_t ic_recv_lock = SPIN_LOCK_UNLOCKED;
156 static volatile int ic_got_reply __initdata = 0;    /* Proto(s) that replied */
157 #endif
158 #ifdef IPCONFIG_DHCP
159 static int ic_dhcp_msgtype __initdata = 0;      /* DHCP msg type received */
160 #endif
161 
162 
163 /*
164  *      Network devices
165  */
166 
167 struct ic_device {
168         struct ic_device *next;
169         struct net_device *dev;
170         unsigned short flags;
171         short able;
172         u32 xid;
173 };
174 
175 static struct ic_device *ic_first_dev __initdata = NULL;/* List of open device */
176 static struct net_device *ic_dev __initdata = NULL;     /* Selected device */
177 
178 static int __init ic_open_devs(void)
179 {
180         struct ic_device *d, **last;
181         struct net_device *dev;
182         unsigned short oflags;
183 
184         last = &ic_first_dev;
185         rtnl_shlock();
186         for (dev = dev_base; dev; dev = dev->next) {
187                 if (user_dev_name[0] ? !strcmp(dev->name, user_dev_name) :
188                     (!(dev->flags & IFF_LOOPBACK) &&
189                      (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) &&
190                      strncmp(dev->name, "dummy", 5))) {
191                         int able = 0;
192                         if (dev->mtu >= 364)
193                                 able |= IC_BOOTP;
194                         else
195                                 printk(KERN_WARNING "DHCP/BOOTP: Ignoring device %s, MTU %d too small", dev->name, dev->mtu);
196                         if (!(dev->flags & IFF_NOARP))
197                                 able |= IC_RARP;
198                         able &= ic_proto_enabled;
199                         if (ic_proto_enabled && !able)
200                                 continue;
201                         oflags = dev->flags;
202                         if (dev_change_flags(dev, oflags | IFF_UP) < 0) {
203                                 printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name);
204                                 continue;
205                         }
206                         if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) {
207                                 rtnl_shunlock();
208                                 return -1;
209                         }
210                         d->dev = dev;
211                         *last = d;
212                         last = &d->next;
213                         d->flags = oflags;
214                         d->able = able;
215                         if (able & IC_BOOTP)
216                                 get_random_bytes(&d->xid, sizeof(u32));
217                         else
218                                 d->xid = 0;
219                         ic_proto_have_if |= able;
220                         DBG(("IP-Config: %s UP (able=%d, xid=%08x)\n",
221                                 dev->name, able, d->xid));
222                 }
223         }
224         rtnl_shunlock();
225 
226         *last = NULL;
227 
228         if (!ic_first_dev) {
229                 if (user_dev_name[0])
230                         printk(KERN_ERR "IP-Config: Device `%s' not found.\n", user_dev_name);
231                 else
232                         printk(KERN_ERR "IP-Config: No network devices available.\n");
233                 return -1;
234         }
235         return 0;
236 }
237 
238 static void __init ic_close_devs(void)
239 {
240         struct ic_device *d, *next;
241         struct net_device *dev;
242 
243         rtnl_shlock();
244         next = ic_first_dev;
245         while ((d = next)) {
246                 next = d->next;
247                 dev = d->dev;
248                 if (dev != ic_dev) {
249                         DBG(("IP-Config: Downing %s\n", dev->name));
250                         dev_change_flags(dev, d->flags);
251                 }
252                 kfree(d);
253         }
254         rtnl_shunlock();
255 }
256 
257 /*
258  *      Interface to various network functions.
259  */
260 
261 static inline void
262 set_sockaddr(struct sockaddr_in *sin, u32 addr, u16 port)
263 {
264         sin->sin_family = AF_INET;
265         sin->sin_addr.s_addr = addr;
266         sin->sin_port = port;
267 }
268 
269 static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg)
270 {
271         int res;
272 
273         mm_segment_t oldfs = get_fs();
274         set_fs(get_ds());
275         res = devinet_ioctl(cmd, arg);
276         set_fs(oldfs);
277         return res;
278 }
279 
280 static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg)
281 {
282         int res;
283 
284         mm_segment_t oldfs = get_fs();
285         set_fs(get_ds());
286         res = ip_rt_ioctl(cmd, arg);
287         set_fs(oldfs);
288         return res;
289 }
290 
291 /*
292  *      Set up interface addresses and routes.
293  */
294 
295 static int __init ic_setup_if(void)
296 {
297         struct ifreq ir;
298         struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr;
299         int err;
300 
301         memset(&ir, 0, sizeof(ir));
302         strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name);
303         set_sockaddr(sin, ic_myaddr, 0);
304         if ((err = ic_dev_ioctl(SIOCSIFADDR, &ir)) < 0) {
305                 printk(KERN_ERR "IP-Config: Unable to set interface address (%d).\n", err);
306                 return -1;
307         }
308         set_sockaddr(sin, ic_netmask, 0);
309         if ((err = ic_dev_ioctl(SIOCSIFNETMASK, &ir)) < 0) {
310                 printk(KERN_ERR "IP-Config: Unable to set interface netmask (%d).\n", err);
311                 return -1;
312         }
313         set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0);
314         if ((err = ic_dev_ioctl(SIOCSIFBRDADDR, &ir)) < 0) {
315                 printk(KERN_ERR "IP-Config: Unable to set interface broadcast address (%d).\n", err);
316                 return -1;
317         }
318         return 0;
319 }
320 
321 static int __init ic_setup_routes(void)
322 {
323         /* No need to setup device routes, only the default route... */
324 
325         if (ic_gateway != INADDR_NONE) {
326                 struct rtentry rm;
327                 int err;
328 
329                 memset(&rm, 0, sizeof(rm));
330                 if ((ic_gateway ^ ic_myaddr) & ic_netmask) {
331                         printk(KERN_ERR "IP-Config: Gateway not on directly connected network.\n");
332                         return -1;
333                 }
334                 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0);
335                 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0);
336                 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0);
337                 rm.rt_flags = RTF_UP | RTF_GATEWAY;
338                 if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) {
339                         printk(KERN_ERR "IP-Config: Cannot add default route (%d).\n", err);
340                         return -1;
341                 }
342         }
343 
344         return 0;
345 }
346 
347 /*
348  *      Fill in default values for all missing parameters.
349  */
350 
351 static int __init ic_defaults(void)
352 {
353         /*
354          *      At this point we have no userspace running so need not
355          *      claim locks on system_utsname
356          */
357          
358         if (!ic_host_name_set)
359                 sprintf(system_utsname.nodename, "%u.%u.%u.%u", NIPQUAD(ic_myaddr));
360 
361         if (root_server_addr == INADDR_NONE)
362                 root_server_addr = ic_servaddr;
363 
364         if (ic_netmask == INADDR_NONE) {
365                 if (IN_CLASSA(ntohl(ic_myaddr)))
366                         ic_netmask = htonl(IN_CLASSA_NET);
367                 else if (IN_CLASSB(ntohl(ic_myaddr)))
368                         ic_netmask = htonl(IN_CLASSB_NET);
369                 else if (IN_CLASSC(ntohl(ic_myaddr)))
370                         ic_netmask = htonl(IN_CLASSC_NET);
371                 else {
372                         printk(KERN_ERR "IP-Config: Unable to guess netmask for address %u.%u.%u.%u\n",
373                                 NIPQUAD(ic_myaddr));
374                         return -1;
375                 }
376                 printk("IP-Config: Guessing netmask %u.%u.%u.%u\n", NIPQUAD(ic_netmask));
377         }
378 
379         return 0;
380 }
381 
382 /*
383  *      RARP support.
384  */
385 
386 #ifdef IPCONFIG_RARP
387 
388 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt);
389 
390 static struct packet_type rarp_packet_type __initdata = {
391         .type = __constant_htons(ETH_P_RARP),
392         .func = ic_rarp_recv,
393 };
394 
395 static inline void ic_rarp_init(void)
396 {
397         dev_add_pack(&rarp_packet_type);
398 }
399 
400 static inline void ic_rarp_cleanup(void)
401 {
402         dev_remove_pack(&rarp_packet_type);
403 }
404 
405 /*
406  *  Process received RARP packet.
407  */
408 static int __init
409 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt)
410 {
411         struct arphdr *rarp;
412         unsigned char *rarp_ptr;
413         unsigned long sip, tip;
414         unsigned char *sha, *tha;               /* s for "source", t for "target" */
415         struct ic_device *d;
416 
417         if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
418                 return NET_RX_DROP;
419 
420         if (!pskb_may_pull(skb, sizeof(struct arphdr)))
421                 goto drop;
422 
423         /* Basic sanity checks can be done without the lock.  */
424         rarp = (struct arphdr *)skb->h.raw;
425 
426         /* If this test doesn't pass, it's not IP, or we should
427          * ignore it anyway.
428          */
429         if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd))
430                 goto drop;
431 
432         /* If it's not a RARP reply, delete it. */
433         if (rarp->ar_op != htons(ARPOP_RREPLY))
434                 goto drop;
435 
436         /* If it's not Ethernet, delete it. */
437         if (rarp->ar_pro != htons(ETH_P_IP))
438                 goto drop;
439 
440         if (!pskb_may_pull(skb,
441                            sizeof(struct arphdr) +
442                            (2 * dev->addr_len) +
443                            (2 * 4)))
444                 goto drop;
445 
446         /* OK, it is all there and looks valid, process... */
447         rarp = (struct arphdr *)skb->h.raw;
448         rarp_ptr = (unsigned char *) (rarp + 1);
449 
450         /* One reply at a time, please. */
451         spin_lock(&ic_recv_lock);
452 
453         /* If we already have a reply, just drop the packet */
454         if (ic_got_reply)
455                 goto drop_unlock;
456 
457         /* Find the ic_device that the packet arrived on */
458         d = ic_first_dev;
459         while (d && d->dev != dev)
460                 d = d->next;
461         if (!d)
462                 goto drop_unlock;       /* should never happen */
463 
464         /* Extract variable-width fields */
465         sha = rarp_ptr;
466         rarp_ptr += dev->addr_len;
467         memcpy(&sip, rarp_ptr, 4);
468         rarp_ptr += 4;
469         tha = rarp_ptr;
470         rarp_ptr += dev->addr_len;
471         memcpy(&tip, rarp_ptr, 4);
472 
473         /* Discard packets which are not meant for us. */
474         if (memcmp(tha, dev->dev_addr, dev->addr_len))
475                 goto drop_unlock;
476 
477         /* Discard packets which are not from specified server. */
478         if (ic_servaddr != INADDR_NONE && ic_servaddr != sip)
479                 goto drop_unlock;
480 
481         /* We have a winner! */
482         ic_dev = dev;
483         if (ic_myaddr == INADDR_NONE)
484                 ic_myaddr = tip;
485         ic_servaddr = sip;
486         ic_got_reply = IC_RARP;
487 
488 drop_unlock:
489         /* Show's over.  Nothing to see here.  */
490         spin_unlock(&ic_recv_lock);
491 
492 drop:
493         /* Throw the packet out. */
494         kfree_skb(skb);
495         return 0;
496 }
497 
498 
499 /*
500  *  Send RARP request packet over a single interface.
501  */
502 static void __init ic_rarp_send_if(struct ic_device *d)
503 {
504         struct net_device *dev = d->dev;
505         arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL,
506                  dev->dev_addr, dev->dev_addr);
507 }
508 #endif
509 
510 /*
511  *      DHCP/BOOTP support.
512  */
513 
514 #ifdef IPCONFIG_BOOTP
515 
516 struct bootp_pkt {              /* BOOTP packet format */
517         struct iphdr iph;       /* IP header */
518         struct udphdr udph;     /* UDP header */
519         u8 op;                  /* 1=request, 2=reply */
520         u8 htype;               /* HW address type */
521         u8 hlen;                /* HW address length */
522         u8 hops;                /* Used only by gateways */
523         u32 xid;                /* Transaction ID */
524         u16 secs;               /* Seconds since we started */
525         u16 flags;              /* Just what it says */
526         u32 client_ip;          /* Client's IP address if known */
527         u32 your_ip;            /* Assigned IP address */
528         u32 server_ip;          /* (Next, e.g. NFS) Server's IP address */
529         u32 relay_ip;           /* IP address of BOOTP relay */
530         u8 hw_addr[16];         /* Client's HW address */
531         u8 serv_name[64];       /* Server host name */
532         u8 boot_file[128];      /* Name of boot file */
533         u8 exten[312];          /* DHCP options / BOOTP vendor extensions */
534 };
535 
536 /* packet ops */
537 #define BOOTP_REQUEST   1
538 #define BOOTP_REPLY     2
539 
540 /* DHCP message types */
541 #define DHCPDISCOVER    1
542 #define DHCPOFFER       2
543 #define DHCPREQUEST     3
544 #define DHCPDECLINE     4
545 #define DHCPACK         5
546 #define DHCPNAK         6
547 #define DHCPRELEASE     7
548 #define DHCPINFORM      8
549 
550 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt);
551 
552 static struct packet_type bootp_packet_type __initdata = {
553         .type = __constant_htons(ETH_P_IP),
554         .func = ic_bootp_recv,
555 };
556 
557 
558 /*
559  *  Initialize DHCP/BOOTP extension fields in the request.
560  */
561 
562 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 };
563 
564 #ifdef IPCONFIG_DHCP
565 
566 static void __init
567 ic_dhcp_init_options(u8 *options)
568 {
569         u8 mt = ((ic_servaddr == INADDR_NONE)
570                  ? DHCPDISCOVER : DHCPREQUEST);
571         u8 *e = options;
572 
573 #ifdef IPCONFIG_DEBUG
574         printk("DHCP: Sending message type %d\n", mt);
575 #endif
576 
577         memcpy(e, ic_bootp_cookie, 4);  /* RFC1048 Magic Cookie */
578         e += 4;
579 
580         *e++ = 53;              /* DHCP message type */
581         *e++ = 1;
582         *e++ = mt;
583 
584         if (mt == DHCPREQUEST) {
585                 *e++ = 54;      /* Server ID (IP address) */
586                 *e++ = 4;
587                 memcpy(e, &ic_servaddr, 4);
588                 e += 4;
589 
590                 *e++ = 50;      /* Requested IP address */
591                 *e++ = 4;
592                 memcpy(e, &ic_myaddr, 4);
593                 e += 4;
594         }
595 
596         /* always? */
597         {
598                 static const u8 ic_req_params[] = {
599                         1,      /* Subnet mask */
600                         3,      /* Default gateway */
601                         6,      /* DNS server */
602                         12,     /* Host name */
603                         15,     /* Domain name */
604                         17,     /* Boot path */
605                         40,     /* NIS domain name */
606                 };
607 
608                 *e++ = 55;      /* Parameter request list */
609                 *e++ = sizeof(ic_req_params);
610                 memcpy(e, ic_req_params, sizeof(ic_req_params));
611                 e += sizeof(ic_req_params);
612         }
613 
614         *e++ = 255;     /* End of the list */
615 }
616 
617 #endif /* IPCONFIG_DHCP */
618 
619 static void __init ic_bootp_init_ext(u8 *e)
620 {
621         memcpy(e, ic_bootp_cookie, 4);  /* RFC1048 Magic Cookie */
622         e += 4;
623         *e++ = 1;               /* Subnet mask request */
624         *e++ = 4;
625         e += 4;
626         *e++ = 3;               /* Default gateway request */
627         *e++ = 4;
628         e += 4;
629         *e++ = 5;               /* Name server request */
630         *e++ = 8;
631         e += 8;
632         *e++ = 12;              /* Host name request */
633         *e++ = 32;
634         e += 32;
635         *e++ = 40;              /* NIS Domain name request */
636         *e++ = 32;
637         e += 32;
638         *e++ = 17;              /* Boot path */
639         *e++ = 40;
640         e += 40;
641 
642         *e++ = 57;              /* set extension buffer size for reply */ 
643         *e++ = 2;
644         *e++ = 1;               /* 128+236+8+20+14, see dhcpd sources */ 
645         *e++ = 150;
646 
647         *e++ = 255;             /* End of the list */
648 }
649 
650 
651 /*
652  *  Initialize the DHCP/BOOTP mechanism.
653  */
654 static inline void ic_bootp_init(void)
655 {
656         int i;
657 
658         for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
659                 ic_nameservers[i] = INADDR_NONE;
660 
661         dev_add_pack(&bootp_packet_type);
662 }
663 
664 
665 /*
666  *  DHCP/BOOTP cleanup.
667  */
668 static inline void ic_bootp_cleanup(void)
669 {
670         dev_remove_pack(&bootp_packet_type);
671 }
672 
673 
674 /*
675  *  Send DHCP/BOOTP request to single interface.
676  */
677 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff)
678 {
679         struct net_device *dev = d->dev;
680         struct sk_buff *skb;
681         struct bootp_pkt *b;
682         int hh_len = LL_RESERVED_SPACE(dev);
683         struct iphdr *h;
684 
685         /* Allocate packet */
686         skb = alloc_skb(sizeof(struct bootp_pkt) + hh_len + 15, GFP_KERNEL);
687         if (!skb)
688                 return;
689         skb_reserve(skb, hh_len);
690         b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt));
691         memset(b, 0, sizeof(struct bootp_pkt));
692 
693         /* Construct IP header */
694         skb->nh.iph = h = &b->iph;
695         h->version = 4;
696         h->ihl = 5;
697         h->tot_len = htons(sizeof(struct bootp_pkt));
698         h->frag_off = htons(IP_DF);
699         h->ttl = 64;
700         h->protocol = IPPROTO_UDP;
701         h->daddr = INADDR_BROADCAST;
702         h->check = ip_fast_csum((unsigned char *) h, h->ihl);
703 
704         /* Construct UDP header */
705         b->udph.source = htons(68);
706         b->udph.dest = htons(67);
707         b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr));
708         /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */
709 
710         /* Construct DHCP/BOOTP header */
711         b->op = BOOTP_REQUEST;
712         if (dev->type < 256) /* check for false types */
713                 b->htype = dev->type;
714         else if (dev->type == ARPHRD_IEEE802_TR) /* fix for token ring */
715                 b->htype = ARPHRD_IEEE802;
716         else {
717                 printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name);
718                 b->htype = dev->type; /* can cause undefined behavior */
719         }
720         b->hlen = dev->addr_len;
721         b->your_ip = INADDR_NONE;
722         b->server_ip = INADDR_NONE;
723         memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
724         b->secs = htons(jiffies_diff / HZ);
725         b->xid = d->xid;
726 
727         /* add DHCP options or BOOTP extensions */
728 #ifdef IPCONFIG_DHCP
729         if (ic_proto_enabled & IC_USE_DHCP)
730                 ic_dhcp_init_options(b->exten);
731         else
732 #endif
733                 ic_bootp_init_ext(b->exten);
734 
735         /* Chain packet down the line... */
736         skb->dev = dev;
737         skb->protocol = htons(ETH_P_IP);
738         if ((dev->hard_header &&
739              dev->hard_header(skb, dev, ntohs(skb->protocol), dev->broadcast, dev->dev_addr, skb->len) < 0) ||
740             dev_queue_xmit(skb) < 0)
741                 printk("E");
742 }
743 
744 
745 /*
746  *  Copy BOOTP-supplied string if not already set.
747  */
748 static int __init ic_bootp_string(char *dest, char *src, int len, int max)
749 {
750         if (!len)
751                 return 0;
752         if (len > max-1)
753                 len = max-1;
754         memcpy(dest, src, len);
755         dest[len] = '\0';
756         return 1;
757 }
758 
759 
760 /*
761  *  Process BOOTP extensions.
762  */
763 static void __init ic_do_bootp_ext(u8 *ext)
764 {
765        u8 servers;
766        int i;
767 
768 #ifdef IPCONFIG_DEBUG
769         u8 *c;
770 
771         printk("DHCP/BOOTP: Got extension %d:",*ext);
772         for(c=ext+2; c<ext+2+ext[1]; c++)
773                 printk(" %02x", *c);
774         printk("\n");
775 #endif
776 
777         switch (*ext++) {
778                 case 1:         /* Subnet mask */
779                         if (ic_netmask == INADDR_NONE)
780                                 memcpy(&ic_netmask, ext+1, 4);
781                         break;
782                 case 3:         /* Default gateway */
783                         if (ic_gateway == INADDR_NONE)
784                                 memcpy(&ic_gateway, ext+1, 4);
785                         break;
786                 case 6:         /* DNS server */
787                         servers= *ext/4;
788                         if (servers > CONF_NAMESERVERS_MAX)
789                                 servers = CONF_NAMESERVERS_MAX;
790                         for (i = 0; i < servers; i++) {
791                                 if (ic_nameservers[i] == INADDR_NONE)
792                                         memcpy(&ic_nameservers[i], ext+1+4*i, 4);
793                         }
794                         break;
795                 case 12:        /* Host name */
796                         ic_bootp_string(system_utsname.nodename, ext+1, *ext, __NEW_UTS_LEN);
797                         ic_host_name_set = 1;
798                         break;
799                 case 15:        /* Domain name (DNS) */
800                         ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
801                         break;
802                 case 17:        /* Root path */
803                         if (!root_server_path[0])
804                                 ic_bootp_string(root_server_path, ext+1, *ext, sizeof(root_server_path));
805                         break;
806                 case 40:        /* NIS Domain name (_not_ DNS) */
807                         ic_bootp_string(system_utsname.domainname, ext+1, *ext, __NEW_UTS_LEN);
808                         break;
809         }
810 }
811 
812 
813 /*
814  *  Receive BOOTP reply.
815  */
816 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt)
817 {
818         struct bootp_pkt *b;
819         struct iphdr *h;
820         struct ic_device *d;
821         int len;
822 
823         /* Perform verifications before taking the lock.  */
824         if (skb->pkt_type == PACKET_OTHERHOST)
825                 goto drop;
826 
827         if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
828                 return NET_RX_DROP;
829 
830         if (!pskb_may_pull(skb,
831                            sizeof(struct iphdr) +
832                            sizeof(struct udphdr)))
833                 goto drop;
834 
835         b = (struct bootp_pkt *) skb->nh.iph;
836         h = &b->iph;
837 
838         if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP)
839                 goto drop;
840 
841         /* Fragments are not supported */
842         if (h->frag_off & htons(IP_OFFSET | IP_MF)) {
843                 if (net_ratelimit())
844                         printk(KERN_ERR "DHCP/BOOTP: Ignoring fragmented "
845                                "reply.\n");
846                 goto drop;
847         }
848 
849         if (skb->len < ntohs(h->tot_len))
850                 goto drop;
851 
852         if (ip_fast_csum((char *) h, h->ihl))
853                 goto drop;
854 
855         if (b->udph.source != htons(67) || b->udph.dest != htons(68))
856                 goto drop;
857 
858         if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
859                 goto drop;
860 
861         len = ntohs(b->udph.len) - sizeof(struct udphdr);
862         if (len < 300)
863                 goto drop;
864 
865         /* Ok the front looks good, make sure we can get at the rest.  */
866         if (!pskb_may_pull(skb, skb->len))
867                 goto drop;
868 
869         b = (struct bootp_pkt *) skb->nh.iph;
870         h = &b->iph;
871 
872         /* One reply at a time, please. */
873         spin_lock(&ic_recv_lock);
874 
875         /* If we already have a reply, just drop the packet */
876         if (ic_got_reply)
877                 goto drop_unlock;
878 
879         /* Find the ic_device that the packet arrived on */
880         d = ic_first_dev;
881         while (d && d->dev != dev)
882                 d = d->next;
883         if (!d)
884                 goto drop_unlock;  /* should never happen */
885 
886         /* Is it a reply to our BOOTP request? */
887         if (b->op != BOOTP_REPLY ||
888             b->xid != d->xid) {
889                 if (net_ratelimit())
890                         printk(KERN_ERR "DHCP/BOOTP: Reply not for us, "
891                                "op[%x] xid[%x]\n",
892                                b->op, b->xid);
893                 goto drop_unlock;
894         }
895 
896         /* Parse extensions */
897         if (!memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */
898                 u8 *end = (u8 *) b + ntohs(b->iph.tot_len);
899                 u8 *ext;
900 
901 #ifdef IPCONFIG_DHCP
902                 if (ic_proto_enabled & IC_USE_DHCP) {
903                         u32 server_id = INADDR_NONE;
904                         int mt = 0;
905 
906                         ext = &b->exten[4];
907                         while (ext < end && *ext != 0xff) {
908                                 u8 *opt = ext++;
909                                 if (*opt == 0)  /* Padding */
910                                         continue;
911                                 ext += *ext + 1;
912                                 if (ext >= end)
913                                         break;
914                                 switch (*opt) {
915                                 case 53:        /* Message type */
916                                         if (opt[1])
917                                                 mt = opt[2];
918                                         break;
919                                 case 54:        /* Server ID (IP address) */
920                                         if (opt[1] >= 4)
921                                                 memcpy(&server_id, opt + 2, 4);
922                                         break;
923                                 };
924                         }
925 
926 #ifdef IPCONFIG_DEBUG
927                         printk("DHCP: Got message type %d\n", mt);
928 #endif
929 
930                         switch (mt) {
931                         case DHCPOFFER:
932                                 /* While in the process of accepting one offer,
933                                  * ignore all others.
934                                  */
935                                 if (ic_myaddr != INADDR_NONE)
936                                         goto drop_unlock;
937 
938                                 /* Let's accept that offer. */
939                                 ic_myaddr = b->your_ip;
940                                 ic_servaddr = server_id;
941 #ifdef IPCONFIG_DEBUG
942                                 printk("DHCP: Offered address %u.%u.%u.%u",
943                                        NIPQUAD(ic_myaddr));
944                                 printk(" by server %u.%u.%u.%u\n",
945                                        NIPQUAD(ic_servaddr));
946 #endif
947                                 /* The DHCP indicated server address takes
948                                  * precedence over the bootp header one if
949                                  * they are different.
950                                  */
951                                 if ((server_id != INADDR_NONE) &&
952                                     (b->server_ip != server_id))
953                                         b->server_ip = ic_servaddr;
954                                 break;
955 
956                         case DHCPACK:
957                                 /* Yeah! */
958                                 break;
959 
960                         default:
961                                 /* Urque.  Forget it*/
962                                 ic_myaddr = INADDR_NONE;
963                                 ic_servaddr = INADDR_NONE;
964                                 goto drop_unlock;
965                         };
966 
967                         ic_dhcp_msgtype = mt;
968 
969                 }
970 #endif /* IPCONFIG_DHCP */
971 
972                 ext = &b->exten[4];
973                 while (ext < end && *ext != 0xff) {
974                         u8 *opt = ext++;
975                         if (*opt == 0)  /* Padding */
976                                 continue;
977                         ext += *ext + 1;
978                         if (ext < end)
979                                 ic_do_bootp_ext(opt);
980                 }
981         }
982 
983         /* We have a winner! */
984         ic_dev = dev;
985         ic_myaddr = b->your_ip;
986         ic_servaddr = b->server_ip;
987         if (ic_gateway == INADDR_NONE && b->relay_ip)
988                 ic_gateway = b->relay_ip;
989         if (ic_nameservers[0] == INADDR_NONE)
990                 ic_nameservers[0] = ic_servaddr;
991         ic_got_reply = IC_BOOTP;
992 
993 drop_unlock:
994         /* Show's over.  Nothing to see here.  */
995         spin_unlock(&ic_recv_lock);
996 
997 drop:
998         /* Throw the packet out. */
999         kfree_skb(skb);
1000 
1001         return 0;
1002 }       
1003 
1004 
1005 #endif
1006 
1007 
1008 /*
1009  *      Dynamic IP configuration -- DHCP, BOOTP, RARP.
1010  */
1011 
1012 #ifdef IPCONFIG_DYNAMIC
1013 
1014 static int __init ic_dynamic(void)
1015 {
1016         int retries;
1017         struct ic_device *d;
1018         unsigned long start_jiffies, timeout, jiff;
1019         int do_bootp = ic_proto_have_if & IC_BOOTP;
1020         int do_rarp = ic_proto_have_if & IC_RARP;
1021 
1022         /*
1023          * If none of DHCP/BOOTP/RARP was selected, return with an error.
1024          * This routine gets only called when some pieces of information
1025          * are missing, and without DHCP/BOOTP/RARP we are unable to get it.
1026          */
1027         if (!ic_proto_enabled) {
1028                 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
1029                 return -1;
1030         }
1031 
1032 #ifdef IPCONFIG_BOOTP
1033         if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
1034                 printk(KERN_ERR "DHCP/BOOTP: No suitable device found.\n");
1035 #endif
1036 #ifdef IPCONFIG_RARP
1037         if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)
1038                 printk(KERN_ERR "RARP: No suitable device found.\n");
1039 #endif
1040 
1041         if (!ic_proto_have_if)
1042                 /* Error message already printed */
1043                 return -1;
1044 
1045         /*
1046          * Setup protocols
1047          */
1048 #ifdef IPCONFIG_BOOTP
1049         if (do_bootp)
1050                 ic_bootp_init();
1051 #endif
1052 #ifdef IPCONFIG_RARP
1053         if (do_rarp)
1054                 ic_rarp_init();
1055 #endif
1056 
1057         /*
1058          * Send requests and wait, until we get an answer. This loop
1059          * seems to be a terrible waste of CPU time, but actually there is
1060          * only one process running at all, so we don't need to use any
1061          * scheduler functions.
1062          * [Actually we could now, but the nothing else running note still 
1063          *  applies.. - AC]
1064          */
1065         printk(KERN_NOTICE "Sending %s%s%s requests .",
1066                do_bootp
1067                 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "",
1068                (do_bootp && do_rarp) ? " and " : "",
1069                do_rarp ? "RARP" : "");
1070 
1071         start_jiffies = jiffies;
1072         d = ic_first_dev;
1073         retries = CONF_SEND_RETRIES;
1074         get_random_bytes(&timeout, sizeof(timeout));
1075         timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned) CONF_TIMEOUT_RANDOM);
1076         for(;;) {
1077 #ifdef IPCONFIG_BOOTP
1078                 if (do_bootp && (d->able & IC_BOOTP))
1079                         ic_bootp_send_if(d, jiffies - start_jiffies);
1080 #endif
1081 #ifdef IPCONFIG_RARP
1082                 if (do_rarp && (d->able & IC_RARP))
1083                         ic_rarp_send_if(d);
1084 #endif
1085 
1086                 jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout);
1087                 while (time_before(jiffies, jiff) && !ic_got_reply) {
1088                         barrier();
1089                         cpu_relax();
1090                 }
1091 #ifdef IPCONFIG_DHCP
1092                 /* DHCP isn't done until we get a DHCPACK. */
1093                 if ((ic_got_reply & IC_BOOTP)
1094                     && (ic_proto_enabled & IC_USE_DHCP)
1095                     && ic_dhcp_msgtype != DHCPACK)
1096                 {
1097                         ic_got_reply = 0;
1098                         printk(",");
1099                         continue;
1100                 }
1101 #endif /* IPCONFIG_DHCP */
1102 
1103                 if (ic_got_reply) {
1104                         printk(" OK\n");
1105                         break;
1106                 }
1107 
1108                 if ((d = d->next))
1109                         continue;
1110 
1111                 if (! --retries) {
1112                         printk(" timed out!\n");
1113                         break;
1114                 }
1115 
1116                 d = ic_first_dev;
1117 
1118                 timeout = timeout CONF_TIMEOUT_MULT;
1119                 if (timeout > CONF_TIMEOUT_MAX)
1120                         timeout = CONF_TIMEOUT_MAX;
1121 
1122                 printk(".");
1123         }
1124 
1125 #ifdef IPCONFIG_BOOTP
1126         if (do_bootp)
1127                 ic_bootp_cleanup();
1128 #endif
1129 #ifdef IPCONFIG_RARP
1130         if (do_rarp)
1131                 ic_rarp_cleanup();
1132 #endif
1133 
1134         if (!ic_got_reply)
1135                 return -1;
1136 
1137         printk("IP-Config: Got %s answer from %u.%u.%u.%u, ",
1138                 ((ic_got_reply & IC_RARP) ? "RARP" 
1139                  : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),
1140                 NIPQUAD(ic_servaddr));
1141         printk("my address is %u.%u.%u.%u\n", NIPQUAD(ic_myaddr));
1142 
1143         return 0;
1144 }
1145 
1146 #endif /* IPCONFIG_DYNAMIC */
1147 
1148 #ifdef CONFIG_PROC_FS
1149 
1150 static int pnp_seq_show(struct seq_file *seq, void *v)
1151 {
1152         int i;
1153 
1154         if (ic_proto_used & IC_PROTO)
1155                 seq_printf(seq, "#PROTO: %s\n",
1156                            (ic_proto_used & IC_RARP) ? "RARP"
1157                            : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP");
1158         else
1159                 seq_puts(seq, "#MANUAL\n");
1160 
1161         if (ic_domain[0])
1162                 seq_printf(seq,
1163                            "domain %s\n", ic_domain);
1164         for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {
1165                 if (ic_nameservers[i] != INADDR_NONE)
1166                         seq_printf(seq,
1167                                    "nameserver %u.%u.%u.%u\n",
1168                                    NIPQUAD(ic_nameservers[i]));
1169         }
1170         if (ic_servaddr != INADDR_NONE)
1171                 seq_printf(seq,
1172                            "bootserver %u.%u.%u.%u\n",
1173                            NIPQUAD(ic_servaddr));
1174         return 0;
1175 }
1176 
1177 static int pnp_seq_open(struct inode *indoe, struct file *file)
1178 {
1179         return single_open(file, pnp_seq_show, NULL);
1180 }
1181 
1182 static struct file_operations pnp_seq_fops = {
1183         .owner          = THIS_MODULE,
1184         .open           = pnp_seq_open,
1185         .read           = seq_read,
1186         .llseek         = seq_lseek,
1187         .release        = single_release,
1188 };
1189 #endif /* CONFIG_PROC_FS */
1190 
1191 /*
1192  *      IP Autoconfig dispatcher.
1193  */
1194 
1195 static int __init ip_auto_config(void)
1196 {
1197         unsigned long jiff;
1198 
1199 #ifdef CONFIG_PROC_FS
1200         proc_net_fops_create("pnp", S_IRUGO, &pnp_seq_fops);
1201 #endif /* CONFIG_PROC_FS */
1202 
1203         if (!ic_enable)
1204                 return 0;
1205 
1206         DBG(("IP-Config: Entered.\n"));
1207 #ifdef IPCONFIG_DYNAMIC
1208  try_try_again:
1209 #endif
1210         /* Give hardware a chance to settle */
1211         jiff = jiffies + CONF_PRE_OPEN;
1212         while (time_before(jiffies, jiff))
1213                 cpu_relax();
1214 
1215         /* Setup all network devices */
1216         if (ic_open_devs() < 0)
1217                 return -1;
1218 
1219         /* Give drivers a chance to settle */
1220         jiff = jiffies + CONF_POST_OPEN;
1221         while (time_before(jiffies, jiff))
1222                 cpu_relax();
1223 
1224         /*
1225          * If the config information is insufficient (e.g., our IP address or
1226          * IP address of the boot server is missing or we have multiple network
1227          * interfaces and no default was set), use BOOTP or RARP to get the
1228          * missing values.
1229          */
1230         if (ic_myaddr == INADDR_NONE ||
1231 #ifdef CONFIG_ROOT_NFS
1232             (MAJOR(ROOT_DEV) == UNNAMED_MAJOR
1233              && root_server_addr == INADDR_NONE
1234              && ic_servaddr == INADDR_NONE) ||
1235 #endif
1236             ic_first_dev->next) {
1237 #ifdef IPCONFIG_DYNAMIC
1238         
1239                 int retries = CONF_OPEN_RETRIES;
1240 
1241                 if (ic_dynamic() < 0) {
1242                         ic_close_devs();
1243 
1244                         /*
1245                          * I don't know why, but sometimes the
1246                          * eepro100 driver (at least) gets upset and
1247                          * doesn't work the first time it's opened.
1248                          * But then if you close it and reopen it, it
1249                          * works just fine.  So we need to try that at
1250                          * least once before giving up.
1251                          *
1252                          * Also, if the root will be NFS-mounted, we
1253                          * have nowhere to go if DHCP fails.  So we
1254                          * just have to keep trying forever.
1255                          *
1256                          *                              -- Chip
1257                          */
1258 #ifdef CONFIG_ROOT_NFS
1259                         if (ROOT_DEV ==  Root_NFS) {
1260                                 printk(KERN_ERR 
1261                                         "IP-Config: Retrying forever (NFS root)...\n");
1262                                 goto try_try_again;
1263                         }
1264 #endif
1265 
1266                         if (--retries) {
1267                                 printk(KERN_ERR 
1268                                        "IP-Config: Reopening network devices...\n");
1269                                 goto try_try_again;
1270                         }
1271 
1272                         /* Oh, well.  At least we tried. */
1273                         printk(KERN_ERR "IP-Config: Auto-configuration of network failed.\n");
1274                         return -1;
1275                 }
1276 #else /* !DYNAMIC */
1277                 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
1278                 ic_close_devs();
1279                 return -1;
1280 #endif /* IPCONFIG_DYNAMIC */
1281         } else {
1282                 /* Device selected manually or only one device -> use it */
1283                 ic_dev = ic_first_dev->dev;
1284         }
1285 
1286         /*
1287          * Use defaults whereever applicable.
1288          */
1289         if (ic_defaults() < 0)
1290                 return -1;
1291 
1292         /*
1293          * Close all network devices except the device we've
1294          * autoconfigured and set up routes.
1295          */
1296         ic_close_devs();
1297         if (ic_setup_if() < 0 || ic_setup_routes() < 0)
1298                 return -1;
1299 
1300         /*
1301          * Record which protocol was actually used.
1302          */
1303 #ifdef IPCONFIG_DYNAMIC
1304         ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP);
1305 #endif
1306 
1307 #ifndef IPCONFIG_SILENT
1308         /*
1309          * Clue in the operator.
1310          */
1311         printk("IP-Config: Complete:");
1312         printk("\n      device=%s", ic_dev->name);
1313         printk(", addr=%u.%u.%u.%u", NIPQUAD(ic_myaddr));
1314         printk(", mask=%u.%u.%u.%u", NIPQUAD(ic_netmask));
1315         printk(", gw=%u.%u.%u.%u", NIPQUAD(ic_gateway));
1316         printk(",\n     host=%s, domain=%s, nis-domain=%s",
1317                system_utsname.nodename, ic_domain, system_utsname.domainname);
1318         printk(",\n     bootserver=%u.%u.%u.%u", NIPQUAD(ic_servaddr));
1319         printk(", rootserver=%u.%u.%u.%u", NIPQUAD(root_server_addr));
1320         printk(", rootpath=%s", root_server_path);
1321         printk("\n");
1322 #endif /* !SILENT */
1323 
1324         return 0;
1325 }
1326 
1327 module_init(ip_auto_config);
1328 
1329 
1330 /*
1331  *  Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
1332  *  command line parameter. It consists of option fields separated by colons in
1333  *  the following order:
1334  *
1335  *  <client-ip>:<server-ip>:<gw-ip>:<netmask>:<host name>:<device>:<PROTO>
1336  *
1337  *  Any of the fields can be empty which means to use a default value:
1338  *      <client-ip>     - address given by BOOTP or RARP
1339  *      <server-ip>     - address of host returning BOOTP or RARP packet
1340  *      <gw-ip>         - none, or the address returned by BOOTP
1341  *      <netmask>       - automatically determined from <client-ip>, or the
1342  *                        one returned by BOOTP
1343  *      <host name>     - <client-ip> in ASCII notation, or the name returned
1344  *                        by BOOTP
1345  *      <device>        - use all available devices
1346  *      <PROTO>:
1347  *         off|none         - don't do autoconfig at all (DEFAULT)
1348  *         on|any           - use any configured protocol
1349  *         dhcp|bootp|rarp  - use only the specified protocol
1350  *         both             - use both BOOTP and RARP (not DHCP)
1351  */
1352 static int __init ic_proto_name(char *name)
1353 {
1354         if (!strcmp(name, "on") || !strcmp(name, "any")) {
1355                 return 1;
1356         }
1357 #ifdef CONFIG_IP_PNP_DHCP
1358         else if (!strcmp(name, "dhcp")) {
1359                 ic_proto_enabled &= ~IC_RARP;
1360                 return 1;
1361         }
1362 #endif
1363 #ifdef CONFIG_IP_PNP_BOOTP
1364         else if (!strcmp(name, "bootp")) {
1365                 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP);
1366                 return 1;
1367         }
1368 #endif
1369 #ifdef CONFIG_IP_PNP_RARP
1370         else if (!strcmp(name, "rarp")) {
1371                 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP);
1372                 return 1;
1373         }
1374 #endif
1375 #ifdef IPCONFIG_DYNAMIC
1376         else if (!strcmp(name, "both")) {
1377                 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */
1378                 return 1;
1379         }
1380 #endif
1381         return 0;
1382 }
1383 
1384 static int __init ip_auto_config_setup(char *addrs)
1385 {
1386         char *cp, *ip, *dp;
1387         int num = 0;
1388 
1389         ic_set_manually = 1;
1390 
1391         ic_enable = (*addrs && 
1392                 (strcmp(addrs, "off") != 0) && 
1393                 (strcmp(addrs, "none") != 0));
1394         if (!ic_enable)
1395                 return 1;
1396 
1397         if (ic_proto_name(addrs))
1398                 return 1;
1399 
1400         /* Parse the whole string */
1401         ip = addrs;
1402         while (ip && *ip) {
1403                 if ((cp = strchr(ip, ':')))
1404                         *cp++ = '\0';
1405                 if (strlen(ip) > 0) {
1406                         DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip));
1407                         switch (num) {
1408                         case 0:
1409                                 if ((ic_myaddr = in_aton(ip)) == INADDR_ANY)
1410                                         ic_myaddr = INADDR_NONE;
1411                                 break;
1412                         case 1:
1413                                 if ((ic_servaddr = in_aton(ip)) == INADDR_ANY)
1414                                         ic_servaddr = INADDR_NONE;
1415                                 break;
1416                         case 2:
1417                                 if ((ic_gateway = in_aton(ip)) == INADDR_ANY)
1418                                         ic_gateway = INADDR_NONE;
1419                                 break;
1420                         case 3:
1421                                 if ((ic_netmask = in_aton(ip)) == INADDR_ANY)
1422                                         ic_netmask = INADDR_NONE;
1423                                 break;
1424                         case 4:
1425                                 if ((dp = strchr(ip, '.'))) {
1426                                         *dp++ = '\0';
1427                                         strlcpy(system_utsname.domainname, dp,
1428                                                 sizeof(system_utsname.domainname));
1429                                 }
1430                                 strlcpy(system_utsname.nodename, ip,
1431                                         sizeof(system_utsname.nodename));
1432                                 ic_host_name_set = 1;
1433                                 break;
1434                         case 5:
1435                                 strlcpy(user_dev_name, ip, sizeof(user_dev_name));
1436                                 break;
1437                         case 6:
1438                                 ic_proto_name(ip);
1439                                 break;
1440                         }
1441                 }
1442                 ip = cp;
1443                 num++;
1444         }
1445 
1446         return 1;
1447 }
1448 
1449 static int __init nfsaddrs_config_setup(char *addrs)
1450 {
1451         return ip_auto_config_setup(addrs);
1452 }
1453 
1454 __setup("ip=", ip_auto_config_setup);
1455 __setup("nfsaddrs=", nfsaddrs_config_setup);
1456 

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