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

Version: ~ [ linux-4.20-rc6 ] ~ [ linux-4.19.8 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.87 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.144 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.166 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.128 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.61 ] ~ [ 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-2.6.31.14 ] ~ [ linux-2.6.30.10 ] ~ [ linux-2.6.29.6 ] ~ [ linux-2.6.28.10 ] ~ [ linux-2.6.27.62 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  *  Automatic Configuration of IP -- use DHCP, BOOTP, RARP, or
  4  *  user-supplied information to configure own IP address and routes.
  5  *
  6  *  Copyright (C) 1996-1998 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
  7  *
  8  *  Derived from network configuration code in fs/nfs/nfsroot.c,
  9  *  originally Copyright (C) 1995, 1996 Gero Kuhlmann and me.
 10  *
 11  *  BOOTP rewritten to construct and analyse packets itself instead
 12  *  of misusing the IP layer. num_bugs_causing_wrong_arp_replies--;
 13  *                                           -- MJ, December 1998
 14  *
 15  *  Fixed ip_auto_config_setup calling at startup in the new "Linker Magic"
 16  *  initialization scheme.
 17  *      - Arnaldo Carvalho de Melo <acme@conectiva.com.br>, 08/11/1999
 18  *
 19  *  DHCP support added.  To users this looks like a whole separate
 20  *  protocol, but we know it's just a bag on the side of BOOTP.
 21  *              -- Chip Salzenberg <chip@valinux.com>, May 2000
 22  *
 23  *  Ported DHCP support from 2.2.16 to 2.4.0-test4
 24  *              -- Eric Biederman <ebiederman@lnxi.com>, 30 Aug 2000
 25  *
 26  *  Merged changes from 2.2.19 into 2.4.3
 27  *              -- Eric Biederman <ebiederman@lnxi.com>, 22 April Aug 2001
 28  *
 29  *  Multiple Nameservers in /proc/net/pnp
 30  *              --  Josef Siemes <jsiemes@web.de>, Aug 2002
 31  *
 32  *  NTP servers in /proc/net/ipconfig/ntp_servers
 33  *              --  Chris Novakovic <chris@chrisn.me.uk>, April 2018
 34  */
 35 
 36 #include <linux/types.h>
 37 #include <linux/string.h>
 38 #include <linux/kernel.h>
 39 #include <linux/jiffies.h>
 40 #include <linux/random.h>
 41 #include <linux/init.h>
 42 #include <linux/utsname.h>
 43 #include <linux/in.h>
 44 #include <linux/if.h>
 45 #include <linux/inet.h>
 46 #include <linux/inetdevice.h>
 47 #include <linux/netdevice.h>
 48 #include <linux/if_arp.h>
 49 #include <linux/skbuff.h>
 50 #include <linux/ip.h>
 51 #include <linux/socket.h>
 52 #include <linux/route.h>
 53 #include <linux/udp.h>
 54 #include <linux/proc_fs.h>
 55 #include <linux/seq_file.h>
 56 #include <linux/major.h>
 57 #include <linux/root_dev.h>
 58 #include <linux/delay.h>
 59 #include <linux/nfs_fs.h>
 60 #include <linux/slab.h>
 61 #include <linux/export.h>
 62 #include <net/net_namespace.h>
 63 #include <net/arp.h>
 64 #include <net/dsa.h>
 65 #include <net/ip.h>
 66 #include <net/ipconfig.h>
 67 #include <net/route.h>
 68 
 69 #include <linux/uaccess.h>
 70 #include <net/checksum.h>
 71 #include <asm/processor.h>
 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_POST_OPEN          10      /* After opening: 10 msecs */
 88 #define CONF_CARRIER_TIMEOUT    120000  /* Wait for carrier timeout */
 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_BASE_TIMEOUT       (HZ*2)  /* Initial timeout: 2 seconds */
 94 #define CONF_TIMEOUT_RANDOM     (HZ)    /* Maximum amount of randomization */
 95 #define CONF_TIMEOUT_MULT       *7/4    /* Rate of timeout growth */
 96 #define CONF_TIMEOUT_MAX        (HZ*30) /* Maximum allowed timeout */
 97 #define CONF_NAMESERVERS_MAX   3       /* Maximum number of nameservers
 98                                            - '3' from resolv.h */
 99 #define CONF_NTP_SERVERS_MAX   3        /* Maximum number of NTP servers */
100 
101 #define NONE cpu_to_be32(INADDR_NONE)
102 #define ANY cpu_to_be32(INADDR_ANY)
103 
104 /*
105  * Public IP configuration
106  */
107 
108 /* This is used by platforms which might be able to set the ipconfig
109  * variables using firmware environment vars.  If this is set, it will
110  * ignore such firmware variables.
111  */
112 int ic_set_manually __initdata = 0;             /* IPconfig parameters set manually */
113 
114 static int ic_enable __initdata;                /* IP config enabled? */
115 
116 /* Protocol choice */
117 int ic_proto_enabled __initdata = 0
118 #ifdef IPCONFIG_BOOTP
119                         | IC_BOOTP
120 #endif
121 #ifdef CONFIG_IP_PNP_DHCP
122                         | IC_USE_DHCP
123 #endif
124 #ifdef IPCONFIG_RARP
125                         | IC_RARP
126 #endif
127                         ;
128 
129 static int ic_host_name_set __initdata; /* Host name set by us? */
130 
131 __be32 ic_myaddr = NONE;                /* My IP address */
132 static __be32 ic_netmask = NONE;        /* Netmask for local subnet */
133 __be32 ic_gateway = NONE;       /* Gateway IP address */
134 
135 #ifdef IPCONFIG_DYNAMIC
136 static __be32 ic_addrservaddr = NONE;   /* IP Address of the IP addresses'server */
137 #endif
138 
139 __be32 ic_servaddr = NONE;      /* Boot server IP address */
140 
141 __be32 root_server_addr = NONE; /* Address of NFS server */
142 u8 root_server_path[256] = { 0, };      /* Path to mount as root */
143 
144 /* vendor class identifier */
145 static char vendor_class_identifier[253] __initdata;
146 
147 #if defined(CONFIG_IP_PNP_DHCP)
148 static char dhcp_client_identifier[253] __initdata;
149 #endif
150 
151 /* Persistent data: */
152 
153 #ifdef IPCONFIG_DYNAMIC
154 static int ic_proto_used;                       /* Protocol used, if any */
155 #else
156 #define ic_proto_used 0
157 #endif
158 static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */
159 static __be32 ic_ntp_servers[CONF_NTP_SERVERS_MAX]; /* NTP server IP addresses */
160 static u8 ic_domain[64];                /* DNS (not NIS) domain name */
161 
162 /*
163  * Private state.
164  */
165 
166 /* Name of user-selected boot device */
167 static char user_dev_name[IFNAMSIZ] __initdata = { 0, };
168 
169 /* Protocols supported by available interfaces */
170 static int ic_proto_have_if __initdata;
171 
172 /* MTU for boot device */
173 static int ic_dev_mtu __initdata;
174 
175 #ifdef IPCONFIG_DYNAMIC
176 static DEFINE_SPINLOCK(ic_recv_lock);
177 static volatile int ic_got_reply __initdata;    /* Proto(s) that replied */
178 #endif
179 #ifdef IPCONFIG_DHCP
180 static int ic_dhcp_msgtype __initdata;  /* DHCP msg type received */
181 #endif
182 
183 
184 /*
185  *      Network devices
186  */
187 
188 struct ic_device {
189         struct ic_device *next;
190         struct net_device *dev;
191         unsigned short flags;
192         short able;
193         __be32 xid;
194 };
195 
196 static struct ic_device *ic_first_dev __initdata;       /* List of open device */
197 static struct ic_device *ic_dev __initdata;             /* Selected device */
198 
199 static bool __init ic_is_init_dev(struct net_device *dev)
200 {
201         if (dev->flags & IFF_LOOPBACK)
202                 return false;
203         return user_dev_name[0] ? !strcmp(dev->name, user_dev_name) :
204             (!(dev->flags & IFF_LOOPBACK) &&
205              (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) &&
206              strncmp(dev->name, "dummy", 5));
207 }
208 
209 static int __init ic_open_devs(void)
210 {
211         struct ic_device *d, **last;
212         struct net_device *dev;
213         unsigned short oflags;
214         unsigned long start, next_msg;
215 
216         last = &ic_first_dev;
217         rtnl_lock();
218 
219         /* bring loopback and DSA master network devices up first */
220         for_each_netdev(&init_net, dev) {
221                 if (!(dev->flags & IFF_LOOPBACK) && !netdev_uses_dsa(dev))
222                         continue;
223                 if (dev_change_flags(dev, dev->flags | IFF_UP) < 0)
224                         pr_err("IP-Config: Failed to open %s\n", dev->name);
225         }
226 
227         for_each_netdev(&init_net, dev) {
228                 if (ic_is_init_dev(dev)) {
229                         int able = 0;
230                         if (dev->mtu >= 364)
231                                 able |= IC_BOOTP;
232                         else
233                                 pr_warn("DHCP/BOOTP: Ignoring device %s, MTU %d too small\n",
234                                         dev->name, dev->mtu);
235                         if (!(dev->flags & IFF_NOARP))
236                                 able |= IC_RARP;
237                         able &= ic_proto_enabled;
238                         if (ic_proto_enabled && !able)
239                                 continue;
240                         oflags = dev->flags;
241                         if (dev_change_flags(dev, oflags | IFF_UP) < 0) {
242                                 pr_err("IP-Config: Failed to open %s\n",
243                                        dev->name);
244                                 continue;
245                         }
246                         if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) {
247                                 rtnl_unlock();
248                                 return -ENOMEM;
249                         }
250                         d->dev = dev;
251                         *last = d;
252                         last = &d->next;
253                         d->flags = oflags;
254                         d->able = able;
255                         if (able & IC_BOOTP)
256                                 get_random_bytes(&d->xid, sizeof(__be32));
257                         else
258                                 d->xid = 0;
259                         ic_proto_have_if |= able;
260                         pr_debug("IP-Config: %s UP (able=%d, xid=%08x)\n",
261                                  dev->name, able, d->xid);
262                 }
263         }
264 
265         /* no point in waiting if we could not bring up at least one device */
266         if (!ic_first_dev)
267                 goto have_carrier;
268 
269         /* wait for a carrier on at least one device */
270         start = jiffies;
271         next_msg = start + msecs_to_jiffies(CONF_CARRIER_TIMEOUT/12);
272         while (time_before(jiffies, start +
273                            msecs_to_jiffies(CONF_CARRIER_TIMEOUT))) {
274                 int wait, elapsed;
275 
276                 for_each_netdev(&init_net, dev)
277                         if (ic_is_init_dev(dev) && netif_carrier_ok(dev))
278                                 goto have_carrier;
279 
280                 msleep(1);
281 
282                 if (time_before(jiffies, next_msg))
283                         continue;
284 
285                 elapsed = jiffies_to_msecs(jiffies - start);
286                 wait = (CONF_CARRIER_TIMEOUT - elapsed + 500)/1000;
287                 pr_info("Waiting up to %d more seconds for network.\n", wait);
288                 next_msg = jiffies + msecs_to_jiffies(CONF_CARRIER_TIMEOUT/12);
289         }
290 have_carrier:
291         rtnl_unlock();
292 
293         *last = NULL;
294 
295         if (!ic_first_dev) {
296                 if (user_dev_name[0])
297                         pr_err("IP-Config: Device `%s' not found\n",
298                                user_dev_name);
299                 else
300                         pr_err("IP-Config: No network devices available\n");
301                 return -ENODEV;
302         }
303         return 0;
304 }
305 
306 static void __init ic_close_devs(void)
307 {
308         struct ic_device *d, *next;
309         struct net_device *dev;
310 
311         rtnl_lock();
312         next = ic_first_dev;
313         while ((d = next)) {
314                 next = d->next;
315                 dev = d->dev;
316                 if (d != ic_dev && !netdev_uses_dsa(dev)) {
317                         pr_debug("IP-Config: Downing %s\n", dev->name);
318                         dev_change_flags(dev, d->flags);
319                 }
320                 kfree(d);
321         }
322         rtnl_unlock();
323 }
324 
325 /*
326  *      Interface to various network functions.
327  */
328 
329 static inline void
330 set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port)
331 {
332         sin->sin_family = AF_INET;
333         sin->sin_addr.s_addr = addr;
334         sin->sin_port = port;
335 }
336 
337 /*
338  *      Set up interface addresses and routes.
339  */
340 
341 static int __init ic_setup_if(void)
342 {
343         struct ifreq ir;
344         struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr;
345         int err;
346 
347         memset(&ir, 0, sizeof(ir));
348         strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->dev->name);
349         set_sockaddr(sin, ic_myaddr, 0);
350         if ((err = devinet_ioctl(&init_net, SIOCSIFADDR, &ir)) < 0) {
351                 pr_err("IP-Config: Unable to set interface address (%d)\n",
352                        err);
353                 return -1;
354         }
355         set_sockaddr(sin, ic_netmask, 0);
356         if ((err = devinet_ioctl(&init_net, SIOCSIFNETMASK, &ir)) < 0) {
357                 pr_err("IP-Config: Unable to set interface netmask (%d)\n",
358                        err);
359                 return -1;
360         }
361         set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0);
362         if ((err = devinet_ioctl(&init_net, SIOCSIFBRDADDR, &ir)) < 0) {
363                 pr_err("IP-Config: Unable to set interface broadcast address (%d)\n",
364                        err);
365                 return -1;
366         }
367         /* Handle the case where we need non-standard MTU on the boot link (a network
368          * using jumbo frames, for instance).  If we can't set the mtu, don't error
369          * out, we'll try to muddle along.
370          */
371         if (ic_dev_mtu != 0) {
372                 rtnl_lock();
373                 if ((err = dev_set_mtu(ic_dev->dev, ic_dev_mtu)) < 0)
374                         pr_err("IP-Config: Unable to set interface mtu to %d (%d)\n",
375                                ic_dev_mtu, err);
376                 rtnl_unlock();
377         }
378         return 0;
379 }
380 
381 static int __init ic_setup_routes(void)
382 {
383         /* No need to setup device routes, only the default route... */
384 
385         if (ic_gateway != NONE) {
386                 struct rtentry rm;
387                 int err;
388 
389                 memset(&rm, 0, sizeof(rm));
390                 if ((ic_gateway ^ ic_myaddr) & ic_netmask) {
391                         pr_err("IP-Config: Gateway not on directly connected network\n");
392                         return -1;
393                 }
394                 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0);
395                 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0);
396                 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0);
397                 rm.rt_flags = RTF_UP | RTF_GATEWAY;
398                 if ((err = ip_rt_ioctl(&init_net, SIOCADDRT, &rm)) < 0) {
399                         pr_err("IP-Config: Cannot add default route (%d)\n",
400                                err);
401                         return -1;
402                 }
403         }
404 
405         return 0;
406 }
407 
408 /*
409  *      Fill in default values for all missing parameters.
410  */
411 
412 static int __init ic_defaults(void)
413 {
414         /*
415          *      At this point we have no userspace running so need not
416          *      claim locks on system_utsname
417          */
418 
419         if (!ic_host_name_set)
420                 sprintf(init_utsname()->nodename, "%pI4", &ic_myaddr);
421 
422         if (root_server_addr == NONE)
423                 root_server_addr = ic_servaddr;
424 
425         if (ic_netmask == NONE) {
426                 if (IN_CLASSA(ntohl(ic_myaddr)))
427                         ic_netmask = htonl(IN_CLASSA_NET);
428                 else if (IN_CLASSB(ntohl(ic_myaddr)))
429                         ic_netmask = htonl(IN_CLASSB_NET);
430                 else if (IN_CLASSC(ntohl(ic_myaddr)))
431                         ic_netmask = htonl(IN_CLASSC_NET);
432                 else {
433                         pr_err("IP-Config: Unable to guess netmask for address %pI4\n",
434                                &ic_myaddr);
435                         return -1;
436                 }
437                 pr_notice("IP-Config: Guessing netmask %pI4\n",
438                           &ic_netmask);
439         }
440 
441         return 0;
442 }
443 
444 /*
445  *      RARP support.
446  */
447 
448 #ifdef IPCONFIG_RARP
449 
450 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
451 
452 static struct packet_type rarp_packet_type __initdata = {
453         .type = cpu_to_be16(ETH_P_RARP),
454         .func = ic_rarp_recv,
455 };
456 
457 static inline void __init ic_rarp_init(void)
458 {
459         dev_add_pack(&rarp_packet_type);
460 }
461 
462 static inline void __init ic_rarp_cleanup(void)
463 {
464         dev_remove_pack(&rarp_packet_type);
465 }
466 
467 /*
468  *  Process received RARP packet.
469  */
470 static int __init
471 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
472 {
473         struct arphdr *rarp;
474         unsigned char *rarp_ptr;
475         __be32 sip, tip;
476         unsigned char *tha;             /* t for "target" */
477         struct ic_device *d;
478 
479         if (!net_eq(dev_net(dev), &init_net))
480                 goto drop;
481 
482         skb = skb_share_check(skb, GFP_ATOMIC);
483         if (!skb)
484                 return NET_RX_DROP;
485 
486         if (!pskb_may_pull(skb, sizeof(struct arphdr)))
487                 goto drop;
488 
489         /* Basic sanity checks can be done without the lock.  */
490         rarp = (struct arphdr *)skb_transport_header(skb);
491 
492         /* If this test doesn't pass, it's not IP, or we should
493          * ignore it anyway.
494          */
495         if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd))
496                 goto drop;
497 
498         /* If it's not a RARP reply, delete it. */
499         if (rarp->ar_op != htons(ARPOP_RREPLY))
500                 goto drop;
501 
502         /* If it's not Ethernet, delete it. */
503         if (rarp->ar_pro != htons(ETH_P_IP))
504                 goto drop;
505 
506         if (!pskb_may_pull(skb, arp_hdr_len(dev)))
507                 goto drop;
508 
509         /* OK, it is all there and looks valid, process... */
510         rarp = (struct arphdr *)skb_transport_header(skb);
511         rarp_ptr = (unsigned char *) (rarp + 1);
512 
513         /* One reply at a time, please. */
514         spin_lock(&ic_recv_lock);
515 
516         /* If we already have a reply, just drop the packet */
517         if (ic_got_reply)
518                 goto drop_unlock;
519 
520         /* Find the ic_device that the packet arrived on */
521         d = ic_first_dev;
522         while (d && d->dev != dev)
523                 d = d->next;
524         if (!d)
525                 goto drop_unlock;       /* should never happen */
526 
527         /* Extract variable-width fields */
528         rarp_ptr += dev->addr_len;
529         memcpy(&sip, rarp_ptr, 4);
530         rarp_ptr += 4;
531         tha = rarp_ptr;
532         rarp_ptr += dev->addr_len;
533         memcpy(&tip, rarp_ptr, 4);
534 
535         /* Discard packets which are not meant for us. */
536         if (memcmp(tha, dev->dev_addr, dev->addr_len))
537                 goto drop_unlock;
538 
539         /* Discard packets which are not from specified server. */
540         if (ic_servaddr != NONE && ic_servaddr != sip)
541                 goto drop_unlock;
542 
543         /* We have a winner! */
544         ic_dev = d;
545         if (ic_myaddr == NONE)
546                 ic_myaddr = tip;
547         ic_servaddr = sip;
548         ic_addrservaddr = sip;
549         ic_got_reply = IC_RARP;
550 
551 drop_unlock:
552         /* Show's over.  Nothing to see here.  */
553         spin_unlock(&ic_recv_lock);
554 
555 drop:
556         /* Throw the packet out. */
557         kfree_skb(skb);
558         return 0;
559 }
560 
561 
562 /*
563  *  Send RARP request packet over a single interface.
564  */
565 static void __init ic_rarp_send_if(struct ic_device *d)
566 {
567         struct net_device *dev = d->dev;
568         arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL,
569                  dev->dev_addr, dev->dev_addr);
570 }
571 #endif
572 
573 /*
574  *  Predefine Nameservers
575  */
576 static inline void __init ic_nameservers_predef(void)
577 {
578         int i;
579 
580         for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
581                 ic_nameservers[i] = NONE;
582 }
583 
584 /* Predefine NTP servers */
585 static inline void __init ic_ntp_servers_predef(void)
586 {
587         int i;
588 
589         for (i = 0; i < CONF_NTP_SERVERS_MAX; i++)
590                 ic_ntp_servers[i] = NONE;
591 }
592 
593 /*
594  *      DHCP/BOOTP support.
595  */
596 
597 #ifdef IPCONFIG_BOOTP
598 
599 struct bootp_pkt {              /* BOOTP packet format */
600         struct iphdr iph;       /* IP header */
601         struct udphdr udph;     /* UDP header */
602         u8 op;                  /* 1=request, 2=reply */
603         u8 htype;               /* HW address type */
604         u8 hlen;                /* HW address length */
605         u8 hops;                /* Used only by gateways */
606         __be32 xid;             /* Transaction ID */
607         __be16 secs;            /* Seconds since we started */
608         __be16 flags;           /* Just what it says */
609         __be32 client_ip;               /* Client's IP address if known */
610         __be32 your_ip;         /* Assigned IP address */
611         __be32 server_ip;               /* (Next, e.g. NFS) Server's IP address */
612         __be32 relay_ip;                /* IP address of BOOTP relay */
613         u8 hw_addr[16];         /* Client's HW address */
614         u8 serv_name[64];       /* Server host name */
615         u8 boot_file[128];      /* Name of boot file */
616         u8 exten[312];          /* DHCP options / BOOTP vendor extensions */
617 };
618 
619 /* packet ops */
620 #define BOOTP_REQUEST   1
621 #define BOOTP_REPLY     2
622 
623 /* DHCP message types */
624 #define DHCPDISCOVER    1
625 #define DHCPOFFER       2
626 #define DHCPREQUEST     3
627 #define DHCPDECLINE     4
628 #define DHCPACK         5
629 #define DHCPNAK         6
630 #define DHCPRELEASE     7
631 #define DHCPINFORM      8
632 
633 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
634 
635 static struct packet_type bootp_packet_type __initdata = {
636         .type = cpu_to_be16(ETH_P_IP),
637         .func = ic_bootp_recv,
638 };
639 
640 /*
641  *  Initialize DHCP/BOOTP extension fields in the request.
642  */
643 
644 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 };
645 
646 #ifdef IPCONFIG_DHCP
647 
648 static void __init
649 ic_dhcp_init_options(u8 *options, struct ic_device *d)
650 {
651         u8 mt = ((ic_servaddr == NONE)
652                  ? DHCPDISCOVER : DHCPREQUEST);
653         u8 *e = options;
654         int len;
655 
656         pr_debug("DHCP: Sending message type %d (%s)\n", mt, d->dev->name);
657 
658         memcpy(e, ic_bootp_cookie, 4);  /* RFC1048 Magic Cookie */
659         e += 4;
660 
661         *e++ = 53;              /* DHCP message type */
662         *e++ = 1;
663         *e++ = mt;
664 
665         if (mt == DHCPREQUEST) {
666                 *e++ = 54;      /* Server ID (IP address) */
667                 *e++ = 4;
668                 memcpy(e, &ic_servaddr, 4);
669                 e += 4;
670 
671                 *e++ = 50;      /* Requested IP address */
672                 *e++ = 4;
673                 memcpy(e, &ic_myaddr, 4);
674                 e += 4;
675         }
676 
677         /* always? */
678         {
679                 static const u8 ic_req_params[] = {
680                         1,      /* Subnet mask */
681                         3,      /* Default gateway */
682                         6,      /* DNS server */
683                         12,     /* Host name */
684                         15,     /* Domain name */
685                         17,     /* Boot path */
686                         26,     /* MTU */
687                         40,     /* NIS domain name */
688                         42,     /* NTP servers */
689                 };
690 
691                 *e++ = 55;      /* Parameter request list */
692                 *e++ = sizeof(ic_req_params);
693                 memcpy(e, ic_req_params, sizeof(ic_req_params));
694                 e += sizeof(ic_req_params);
695 
696                 if (ic_host_name_set) {
697                         *e++ = 12;      /* host-name */
698                         len = strlen(utsname()->nodename);
699                         *e++ = len;
700                         memcpy(e, utsname()->nodename, len);
701                         e += len;
702                 }
703                 if (*vendor_class_identifier) {
704                         pr_info("DHCP: sending class identifier \"%s\"\n",
705                                 vendor_class_identifier);
706                         *e++ = 60;      /* Class-identifier */
707                         len = strlen(vendor_class_identifier);
708                         *e++ = len;
709                         memcpy(e, vendor_class_identifier, len);
710                         e += len;
711                 }
712                 len = strlen(dhcp_client_identifier + 1);
713                 /* the minimum length of identifier is 2, include 1 byte type,
714                  * and can not be larger than the length of options
715                  */
716                 if (len >= 1 && len < 312 - (e - options) - 1) {
717                         *e++ = 61;
718                         *e++ = len + 1;
719                         memcpy(e, dhcp_client_identifier, len + 1);
720                         e += len + 1;
721                 }
722         }
723 
724         *e++ = 255;     /* End of the list */
725 }
726 
727 #endif /* IPCONFIG_DHCP */
728 
729 static void __init ic_bootp_init_ext(u8 *e)
730 {
731         memcpy(e, ic_bootp_cookie, 4);  /* RFC1048 Magic Cookie */
732         e += 4;
733         *e++ = 1;               /* Subnet mask request */
734         *e++ = 4;
735         e += 4;
736         *e++ = 3;               /* Default gateway request */
737         *e++ = 4;
738         e += 4;
739 #if CONF_NAMESERVERS_MAX > 0
740         *e++ = 6;               /* (DNS) name server request */
741         *e++ = 4 * CONF_NAMESERVERS_MAX;
742         e += 4 * CONF_NAMESERVERS_MAX;
743 #endif
744         *e++ = 12;              /* Host name request */
745         *e++ = 32;
746         e += 32;
747         *e++ = 40;              /* NIS Domain name request */
748         *e++ = 32;
749         e += 32;
750         *e++ = 17;              /* Boot path */
751         *e++ = 40;
752         e += 40;
753 
754         *e++ = 57;              /* set extension buffer size for reply */
755         *e++ = 2;
756         *e++ = 1;               /* 128+236+8+20+14, see dhcpd sources */
757         *e++ = 150;
758 
759         *e++ = 255;             /* End of the list */
760 }
761 
762 
763 /*
764  *  Initialize the DHCP/BOOTP mechanism.
765  */
766 static inline void __init ic_bootp_init(void)
767 {
768         /* Re-initialise all name servers and NTP servers to NONE, in case any
769          * were set via the "ip=" or "nfsaddrs=" kernel command line parameters:
770          * any IP addresses specified there will already have been decoded but
771          * are no longer needed
772          */
773         ic_nameservers_predef();
774         ic_ntp_servers_predef();
775 
776         dev_add_pack(&bootp_packet_type);
777 }
778 
779 
780 /*
781  *  DHCP/BOOTP cleanup.
782  */
783 static inline void __init ic_bootp_cleanup(void)
784 {
785         dev_remove_pack(&bootp_packet_type);
786 }
787 
788 
789 /*
790  *  Send DHCP/BOOTP request to single interface.
791  */
792 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff)
793 {
794         struct net_device *dev = d->dev;
795         struct sk_buff *skb;
796         struct bootp_pkt *b;
797         struct iphdr *h;
798         int hlen = LL_RESERVED_SPACE(dev);
799         int tlen = dev->needed_tailroom;
800 
801         /* Allocate packet */
802         skb = alloc_skb(sizeof(struct bootp_pkt) + hlen + tlen + 15,
803                         GFP_KERNEL);
804         if (!skb)
805                 return;
806         skb_reserve(skb, hlen);
807         b = skb_put_zero(skb, sizeof(struct bootp_pkt));
808 
809         /* Construct IP header */
810         skb_reset_network_header(skb);
811         h = ip_hdr(skb);
812         h->version = 4;
813         h->ihl = 5;
814         h->tot_len = htons(sizeof(struct bootp_pkt));
815         h->frag_off = htons(IP_DF);
816         h->ttl = 64;
817         h->protocol = IPPROTO_UDP;
818         h->daddr = htonl(INADDR_BROADCAST);
819         h->check = ip_fast_csum((unsigned char *) h, h->ihl);
820 
821         /* Construct UDP header */
822         b->udph.source = htons(68);
823         b->udph.dest = htons(67);
824         b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr));
825         /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */
826 
827         /* Construct DHCP/BOOTP header */
828         b->op = BOOTP_REQUEST;
829         if (dev->type < 256) /* check for false types */
830                 b->htype = dev->type;
831         else if (dev->type == ARPHRD_FDDI)
832                 b->htype = ARPHRD_ETHER;
833         else {
834                 pr_warn("Unknown ARP type 0x%04x for device %s\n", dev->type,
835                         dev->name);
836                 b->htype = dev->type; /* can cause undefined behavior */
837         }
838 
839         /* server_ip and your_ip address are both already zero per RFC2131 */
840         b->hlen = dev->addr_len;
841         memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
842         b->secs = htons(jiffies_diff / HZ);
843         b->xid = d->xid;
844 
845         /* add DHCP options or BOOTP extensions */
846 #ifdef IPCONFIG_DHCP
847         if (ic_proto_enabled & IC_USE_DHCP)
848                 ic_dhcp_init_options(b->exten, d);
849         else
850 #endif
851                 ic_bootp_init_ext(b->exten);
852 
853         /* Chain packet down the line... */
854         skb->dev = dev;
855         skb->protocol = htons(ETH_P_IP);
856         if (dev_hard_header(skb, dev, ntohs(skb->protocol),
857                             dev->broadcast, dev->dev_addr, skb->len) < 0) {
858                 kfree_skb(skb);
859                 printk("E");
860                 return;
861         }
862 
863         if (dev_queue_xmit(skb) < 0)
864                 printk("E");
865 }
866 
867 
868 /*
869  *  Copy BOOTP-supplied string if not already set.
870  */
871 static int __init ic_bootp_string(char *dest, char *src, int len, int max)
872 {
873         if (!len)
874                 return 0;
875         if (len > max-1)
876                 len = max-1;
877         memcpy(dest, src, len);
878         dest[len] = '\0';
879         return 1;
880 }
881 
882 
883 /*
884  *  Process BOOTP extensions.
885  */
886 static void __init ic_do_bootp_ext(u8 *ext)
887 {
888         u8 servers;
889         int i;
890         __be16 mtu;
891 
892         u8 *c;
893 
894         pr_debug("DHCP/BOOTP: Got extension %d:", *ext);
895         for (c=ext+2; c<ext+2+ext[1]; c++)
896                 pr_debug(" %02x", *c);
897         pr_debug("\n");
898 
899         switch (*ext++) {
900         case 1:         /* Subnet mask */
901                 if (ic_netmask == NONE)
902                         memcpy(&ic_netmask, ext+1, 4);
903                 break;
904         case 3:         /* Default gateway */
905                 if (ic_gateway == NONE)
906                         memcpy(&ic_gateway, ext+1, 4);
907                 break;
908         case 6:         /* DNS server */
909                 servers= *ext/4;
910                 if (servers > CONF_NAMESERVERS_MAX)
911                         servers = CONF_NAMESERVERS_MAX;
912                 for (i = 0; i < servers; i++) {
913                         if (ic_nameservers[i] == NONE)
914                                 memcpy(&ic_nameservers[i], ext+1+4*i, 4);
915                 }
916                 break;
917         case 12:        /* Host name */
918                 ic_bootp_string(utsname()->nodename, ext+1, *ext,
919                                 __NEW_UTS_LEN);
920                 ic_host_name_set = 1;
921                 break;
922         case 15:        /* Domain name (DNS) */
923                 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
924                 break;
925         case 17:        /* Root path */
926                 if (!root_server_path[0])
927                         ic_bootp_string(root_server_path, ext+1, *ext,
928                                         sizeof(root_server_path));
929                 break;
930         case 26:        /* Interface MTU */
931                 memcpy(&mtu, ext+1, sizeof(mtu));
932                 ic_dev_mtu = ntohs(mtu);
933                 break;
934         case 40:        /* NIS Domain name (_not_ DNS) */
935                 ic_bootp_string(utsname()->domainname, ext+1, *ext,
936                                 __NEW_UTS_LEN);
937                 break;
938         case 42:        /* NTP servers */
939                 servers = *ext / 4;
940                 if (servers > CONF_NTP_SERVERS_MAX)
941                         servers = CONF_NTP_SERVERS_MAX;
942                 for (i = 0; i < servers; i++) {
943                         if (ic_ntp_servers[i] == NONE)
944                                 memcpy(&ic_ntp_servers[i], ext+1+4*i, 4);
945                 }
946                 break;
947         }
948 }
949 
950 
951 /*
952  *  Receive BOOTP reply.
953  */
954 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
955 {
956         struct bootp_pkt *b;
957         struct iphdr *h;
958         struct ic_device *d;
959         int len, ext_len;
960 
961         if (!net_eq(dev_net(dev), &init_net))
962                 goto drop;
963 
964         /* Perform verifications before taking the lock.  */
965         if (skb->pkt_type == PACKET_OTHERHOST)
966                 goto drop;
967 
968         skb = skb_share_check(skb, GFP_ATOMIC);
969         if (!skb)
970                 return NET_RX_DROP;
971 
972         if (!pskb_may_pull(skb,
973                            sizeof(struct iphdr) +
974                            sizeof(struct udphdr)))
975                 goto drop;
976 
977         b = (struct bootp_pkt *)skb_network_header(skb);
978         h = &b->iph;
979 
980         if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP)
981                 goto drop;
982 
983         /* Fragments are not supported */
984         if (ip_is_fragment(h)) {
985                 net_err_ratelimited("DHCP/BOOTP: Ignoring fragmented reply\n");
986                 goto drop;
987         }
988 
989         if (skb->len < ntohs(h->tot_len))
990                 goto drop;
991 
992         if (ip_fast_csum((char *) h, h->ihl))
993                 goto drop;
994 
995         if (b->udph.source != htons(67) || b->udph.dest != htons(68))
996                 goto drop;
997 
998         if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
999                 goto drop;
1000 
1001         len = ntohs(b->udph.len) - sizeof(struct udphdr);
1002         ext_len = len - (sizeof(*b) -
1003                          sizeof(struct iphdr) -
1004                          sizeof(struct udphdr) -
1005                          sizeof(b->exten));
1006         if (ext_len < 0)
1007                 goto drop;
1008 
1009         /* Ok the front looks good, make sure we can get at the rest.  */
1010         if (!pskb_may_pull(skb, skb->len))
1011                 goto drop;
1012 
1013         b = (struct bootp_pkt *)skb_network_header(skb);
1014         h = &b->iph;
1015 
1016         /* One reply at a time, please. */
1017         spin_lock(&ic_recv_lock);
1018 
1019         /* If we already have a reply, just drop the packet */
1020         if (ic_got_reply)
1021                 goto drop_unlock;
1022 
1023         /* Find the ic_device that the packet arrived on */
1024         d = ic_first_dev;
1025         while (d && d->dev != dev)
1026                 d = d->next;
1027         if (!d)
1028                 goto drop_unlock;  /* should never happen */
1029 
1030         /* Is it a reply to our BOOTP request? */
1031         if (b->op != BOOTP_REPLY ||
1032             b->xid != d->xid) {
1033                 net_err_ratelimited("DHCP/BOOTP: Reply not for us on %s, op[%x] xid[%x]\n",
1034                                     d->dev->name, b->op, b->xid);
1035                 goto drop_unlock;
1036         }
1037 
1038         /* Parse extensions */
1039         if (ext_len >= 4 &&
1040             !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */
1041                 u8 *end = (u8 *) b + ntohs(b->iph.tot_len);
1042                 u8 *ext;
1043 
1044 #ifdef IPCONFIG_DHCP
1045                 if (ic_proto_enabled & IC_USE_DHCP) {
1046                         __be32 server_id = NONE;
1047                         int mt = 0;
1048 
1049                         ext = &b->exten[4];
1050                         while (ext < end && *ext != 0xff) {
1051                                 u8 *opt = ext++;
1052                                 if (*opt == 0)  /* Padding */
1053                                         continue;
1054                                 ext += *ext + 1;
1055                                 if (ext >= end)
1056                                         break;
1057                                 switch (*opt) {
1058                                 case 53:        /* Message type */
1059                                         if (opt[1])
1060                                                 mt = opt[2];
1061                                         break;
1062                                 case 54:        /* Server ID (IP address) */
1063                                         if (opt[1] >= 4)
1064                                                 memcpy(&server_id, opt + 2, 4);
1065                                         break;
1066                                 }
1067                         }
1068 
1069                         pr_debug("DHCP: Got message type %d (%s)\n", mt, d->dev->name);
1070 
1071                         switch (mt) {
1072                         case DHCPOFFER:
1073                                 /* While in the process of accepting one offer,
1074                                  * ignore all others.
1075                                  */
1076                                 if (ic_myaddr != NONE)
1077                                         goto drop_unlock;
1078 
1079                                 /* Let's accept that offer. */
1080                                 ic_myaddr = b->your_ip;
1081                                 ic_servaddr = server_id;
1082                                 pr_debug("DHCP: Offered address %pI4 by server %pI4\n",
1083                                          &ic_myaddr, &b->iph.saddr);
1084                                 /* The DHCP indicated server address takes
1085                                  * precedence over the bootp header one if
1086                                  * they are different.
1087                                  */
1088                                 if ((server_id != NONE) &&
1089                                     (b->server_ip != server_id))
1090                                         b->server_ip = ic_servaddr;
1091                                 break;
1092 
1093                         case DHCPACK:
1094                                 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0)
1095                                         goto drop_unlock;
1096 
1097                                 /* Yeah! */
1098                                 break;
1099 
1100                         default:
1101                                 /* Urque.  Forget it*/
1102                                 ic_myaddr = NONE;
1103                                 ic_servaddr = NONE;
1104                                 goto drop_unlock;
1105                         }
1106 
1107                         ic_dhcp_msgtype = mt;
1108 
1109                 }
1110 #endif /* IPCONFIG_DHCP */
1111 
1112                 ext = &b->exten[4];
1113                 while (ext < end && *ext != 0xff) {
1114                         u8 *opt = ext++;
1115                         if (*opt == 0)  /* Padding */
1116                                 continue;
1117                         ext += *ext + 1;
1118                         if (ext < end)
1119                                 ic_do_bootp_ext(opt);
1120                 }
1121         }
1122 
1123         /* We have a winner! */
1124         ic_dev = d;
1125         ic_myaddr = b->your_ip;
1126         ic_servaddr = b->server_ip;
1127         ic_addrservaddr = b->iph.saddr;
1128         if (ic_gateway == NONE && b->relay_ip)
1129                 ic_gateway = b->relay_ip;
1130         if (ic_nameservers[0] == NONE)
1131                 ic_nameservers[0] = ic_servaddr;
1132         ic_got_reply = IC_BOOTP;
1133 
1134 drop_unlock:
1135         /* Show's over.  Nothing to see here.  */
1136         spin_unlock(&ic_recv_lock);
1137 
1138 drop:
1139         /* Throw the packet out. */
1140         kfree_skb(skb);
1141 
1142         return 0;
1143 }
1144 
1145 
1146 #endif
1147 
1148 
1149 /*
1150  *      Dynamic IP configuration -- DHCP, BOOTP, RARP.
1151  */
1152 
1153 #ifdef IPCONFIG_DYNAMIC
1154 
1155 static int __init ic_dynamic(void)
1156 {
1157         int retries;
1158         struct ic_device *d;
1159         unsigned long start_jiffies, timeout, jiff;
1160         int do_bootp = ic_proto_have_if & IC_BOOTP;
1161         int do_rarp = ic_proto_have_if & IC_RARP;
1162 
1163         /*
1164          * If none of DHCP/BOOTP/RARP was selected, return with an error.
1165          * This routine gets only called when some pieces of information
1166          * are missing, and without DHCP/BOOTP/RARP we are unable to get it.
1167          */
1168         if (!ic_proto_enabled) {
1169                 pr_err("IP-Config: Incomplete network configuration information\n");
1170                 return -1;
1171         }
1172 
1173 #ifdef IPCONFIG_BOOTP
1174         if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
1175                 pr_err("DHCP/BOOTP: No suitable device found\n");
1176 #endif
1177 #ifdef IPCONFIG_RARP
1178         if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)
1179                 pr_err("RARP: No suitable device found\n");
1180 #endif
1181 
1182         if (!ic_proto_have_if)
1183                 /* Error message already printed */
1184                 return -1;
1185 
1186         /*
1187          * Setup protocols
1188          */
1189 #ifdef IPCONFIG_BOOTP
1190         if (do_bootp)
1191                 ic_bootp_init();
1192 #endif
1193 #ifdef IPCONFIG_RARP
1194         if (do_rarp)
1195                 ic_rarp_init();
1196 #endif
1197 
1198         /*
1199          * Send requests and wait, until we get an answer. This loop
1200          * seems to be a terrible waste of CPU time, but actually there is
1201          * only one process running at all, so we don't need to use any
1202          * scheduler functions.
1203          * [Actually we could now, but the nothing else running note still
1204          *  applies.. - AC]
1205          */
1206         pr_notice("Sending %s%s%s requests .",
1207                   do_bootp
1208                   ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "",
1209                   (do_bootp && do_rarp) ? " and " : "",
1210                   do_rarp ? "RARP" : "");
1211 
1212         start_jiffies = jiffies;
1213         d = ic_first_dev;
1214         retries = CONF_SEND_RETRIES;
1215         get_random_bytes(&timeout, sizeof(timeout));
1216         timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned int) CONF_TIMEOUT_RANDOM);
1217         for (;;) {
1218 #ifdef IPCONFIG_BOOTP
1219                 if (do_bootp && (d->able & IC_BOOTP))
1220                         ic_bootp_send_if(d, jiffies - start_jiffies);
1221 #endif
1222 #ifdef IPCONFIG_RARP
1223                 if (do_rarp && (d->able & IC_RARP))
1224                         ic_rarp_send_if(d);
1225 #endif
1226 
1227                 if (!d->next) {
1228                         jiff = jiffies + timeout;
1229                         while (time_before(jiffies, jiff) && !ic_got_reply)
1230                                 schedule_timeout_uninterruptible(1);
1231                 }
1232 #ifdef IPCONFIG_DHCP
1233                 /* DHCP isn't done until we get a DHCPACK. */
1234                 if ((ic_got_reply & IC_BOOTP) &&
1235                     (ic_proto_enabled & IC_USE_DHCP) &&
1236                     ic_dhcp_msgtype != DHCPACK) {
1237                         ic_got_reply = 0;
1238                         /* continue on device that got the reply */
1239                         d = ic_dev;
1240                         pr_cont(",");
1241                         continue;
1242                 }
1243 #endif /* IPCONFIG_DHCP */
1244 
1245                 if (ic_got_reply) {
1246                         pr_cont(" OK\n");
1247                         break;
1248                 }
1249 
1250                 if ((d = d->next))
1251                         continue;
1252 
1253                 if (! --retries) {
1254                         pr_cont(" timed out!\n");
1255                         break;
1256                 }
1257 
1258                 d = ic_first_dev;
1259 
1260                 timeout = timeout CONF_TIMEOUT_MULT;
1261                 if (timeout > CONF_TIMEOUT_MAX)
1262                         timeout = CONF_TIMEOUT_MAX;
1263 
1264                 pr_cont(".");
1265         }
1266 
1267 #ifdef IPCONFIG_BOOTP
1268         if (do_bootp)
1269                 ic_bootp_cleanup();
1270 #endif
1271 #ifdef IPCONFIG_RARP
1272         if (do_rarp)
1273                 ic_rarp_cleanup();
1274 #endif
1275 
1276         if (!ic_got_reply) {
1277                 ic_myaddr = NONE;
1278                 return -1;
1279         }
1280 
1281         pr_info("IP-Config: Got %s answer from %pI4, my address is %pI4\n",
1282                 ((ic_got_reply & IC_RARP) ? "RARP"
1283                 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),
1284                 &ic_addrservaddr, &ic_myaddr);
1285 
1286         return 0;
1287 }
1288 
1289 #endif /* IPCONFIG_DYNAMIC */
1290 
1291 #ifdef CONFIG_PROC_FS
1292 /* proc_dir_entry for /proc/net/ipconfig */
1293 static struct proc_dir_entry *ipconfig_dir;
1294 
1295 /* Name servers: */
1296 static int pnp_seq_show(struct seq_file *seq, void *v)
1297 {
1298         int i;
1299 
1300         if (ic_proto_used & IC_PROTO)
1301                 seq_printf(seq, "#PROTO: %s\n",
1302                            (ic_proto_used & IC_RARP) ? "RARP"
1303                            : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP");
1304         else
1305                 seq_puts(seq, "#MANUAL\n");
1306 
1307         if (ic_domain[0])
1308                 seq_printf(seq,
1309                            "domain %s\n", ic_domain);
1310         for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {
1311                 if (ic_nameservers[i] != NONE)
1312                         seq_printf(seq, "nameserver %pI4\n",
1313                                    &ic_nameservers[i]);
1314         }
1315         if (ic_servaddr != NONE)
1316                 seq_printf(seq, "bootserver %pI4\n",
1317                            &ic_servaddr);
1318         return 0;
1319 }
1320 
1321 /* Create the /proc/net/ipconfig directory */
1322 static int __init ipconfig_proc_net_init(void)
1323 {
1324         ipconfig_dir = proc_net_mkdir(&init_net, "ipconfig", init_net.proc_net);
1325         if (!ipconfig_dir)
1326                 return -ENOMEM;
1327 
1328         return 0;
1329 }
1330 
1331 /* Create a new file under /proc/net/ipconfig */
1332 static int ipconfig_proc_net_create(const char *name,
1333                                     const struct file_operations *fops)
1334 {
1335         char *pname;
1336         struct proc_dir_entry *p;
1337 
1338         if (!ipconfig_dir)
1339                 return -ENOMEM;
1340 
1341         pname = kasprintf(GFP_KERNEL, "%s%s", "ipconfig/", name);
1342         if (!pname)
1343                 return -ENOMEM;
1344 
1345         p = proc_create(pname, 0444, init_net.proc_net, fops);
1346         kfree(pname);
1347         if (!p)
1348                 return -ENOMEM;
1349 
1350         return 0;
1351 }
1352 
1353 /* Write NTP server IP addresses to /proc/net/ipconfig/ntp_servers */
1354 static int ntp_servers_seq_show(struct seq_file *seq, void *v)
1355 {
1356         int i;
1357 
1358         for (i = 0; i < CONF_NTP_SERVERS_MAX; i++) {
1359                 if (ic_ntp_servers[i] != NONE)
1360                         seq_printf(seq, "%pI4\n", &ic_ntp_servers[i]);
1361         }
1362         return 0;
1363 }
1364 
1365 static int ntp_servers_seq_open(struct inode *inode, struct file *file)
1366 {
1367         return single_open(file, ntp_servers_seq_show, NULL);
1368 }
1369 
1370 static const struct file_operations ntp_servers_seq_fops = {
1371         .open           = ntp_servers_seq_open,
1372         .read           = seq_read,
1373         .llseek         = seq_lseek,
1374         .release        = single_release,
1375 };
1376 #endif /* CONFIG_PROC_FS */
1377 
1378 /*
1379  *  Extract IP address from the parameter string if needed. Note that we
1380  *  need to have root_server_addr set _before_ IPConfig gets called as it
1381  *  can override it.
1382  */
1383 __be32 __init root_nfs_parse_addr(char *name)
1384 {
1385         __be32 addr;
1386         int octets = 0;
1387         char *cp, *cq;
1388 
1389         cp = cq = name;
1390         while (octets < 4) {
1391                 while (*cp >= '' && *cp <= '9')
1392                         cp++;
1393                 if (cp == cq || cp - cq > 3)
1394                         break;
1395                 if (*cp == '.' || octets == 3)
1396                         octets++;
1397                 if (octets < 4)
1398                         cp++;
1399                 cq = cp;
1400         }
1401         if (octets == 4 && (*cp == ':' || *cp == '\0')) {
1402                 if (*cp == ':')
1403                         *cp++ = '\0';
1404                 addr = in_aton(name);
1405                 memmove(name, cp, strlen(cp) + 1);
1406         } else
1407                 addr = NONE;
1408 
1409         return addr;
1410 }
1411 
1412 #define DEVICE_WAIT_MAX         12 /* 12 seconds */
1413 
1414 static int __init wait_for_devices(void)
1415 {
1416         int i;
1417 
1418         for (i = 0; i < DEVICE_WAIT_MAX; i++) {
1419                 struct net_device *dev;
1420                 int found = 0;
1421 
1422                 rtnl_lock();
1423                 for_each_netdev(&init_net, dev) {
1424                         if (ic_is_init_dev(dev)) {
1425                                 found = 1;
1426                                 break;
1427                         }
1428                 }
1429                 rtnl_unlock();
1430                 if (found)
1431                         return 0;
1432                 ssleep(1);
1433         }
1434         return -ENODEV;
1435 }
1436 
1437 /*
1438  *      IP Autoconfig dispatcher.
1439  */
1440 
1441 static int __init ip_auto_config(void)
1442 {
1443         __be32 addr;
1444 #ifdef IPCONFIG_DYNAMIC
1445         int retries = CONF_OPEN_RETRIES;
1446 #endif
1447         int err;
1448         unsigned int i;
1449 
1450         /* Initialise all name servers and NTP servers to NONE (but only if the
1451          * "ip=" or "nfsaddrs=" kernel command line parameters weren't decoded,
1452          * otherwise we'll overwrite the IP addresses specified there)
1453          */
1454         if (ic_set_manually == 0) {
1455                 ic_nameservers_predef();
1456                 ic_ntp_servers_predef();
1457         }
1458 
1459 #ifdef CONFIG_PROC_FS
1460         proc_create_single("pnp", 0444, init_net.proc_net, pnp_seq_show);
1461 
1462         if (ipconfig_proc_net_init() == 0)
1463                 ipconfig_proc_net_create("ntp_servers", &ntp_servers_seq_fops);
1464 #endif /* CONFIG_PROC_FS */
1465 
1466         if (!ic_enable)
1467                 return 0;
1468 
1469         pr_debug("IP-Config: Entered.\n");
1470 #ifdef IPCONFIG_DYNAMIC
1471  try_try_again:
1472 #endif
1473         /* Wait for devices to appear */
1474         err = wait_for_devices();
1475         if (err)
1476                 return err;
1477 
1478         /* Setup all network devices */
1479         err = ic_open_devs();
1480         if (err)
1481                 return err;
1482 
1483         /* Give drivers a chance to settle */
1484         msleep(CONF_POST_OPEN);
1485 
1486         /*
1487          * If the config information is insufficient (e.g., our IP address or
1488          * IP address of the boot server is missing or we have multiple network
1489          * interfaces and no default was set), use BOOTP or RARP to get the
1490          * missing values.
1491          */
1492         if (ic_myaddr == NONE ||
1493 #ifdef CONFIG_ROOT_NFS
1494             (root_server_addr == NONE &&
1495              ic_servaddr == NONE &&
1496              ROOT_DEV == Root_NFS) ||
1497 #endif
1498             ic_first_dev->next) {
1499 #ifdef IPCONFIG_DYNAMIC
1500                 if (ic_dynamic() < 0) {
1501                         ic_close_devs();
1502 
1503                         /*
1504                          * I don't know why, but sometimes the
1505                          * eepro100 driver (at least) gets upset and
1506                          * doesn't work the first time it's opened.
1507                          * But then if you close it and reopen it, it
1508                          * works just fine.  So we need to try that at
1509                          * least once before giving up.
1510                          *
1511                          * Also, if the root will be NFS-mounted, we
1512                          * have nowhere to go if DHCP fails.  So we
1513                          * just have to keep trying forever.
1514                          *
1515                          *                              -- Chip
1516                          */
1517 #ifdef CONFIG_ROOT_NFS
1518                         if (ROOT_DEV ==  Root_NFS) {
1519                                 pr_err("IP-Config: Retrying forever (NFS root)...\n");
1520                                 goto try_try_again;
1521                         }
1522 #endif
1523 
1524                         if (--retries) {
1525                                 pr_err("IP-Config: Reopening network devices...\n");
1526                                 goto try_try_again;
1527                         }
1528 
1529                         /* Oh, well.  At least we tried. */
1530                         pr_err("IP-Config: Auto-configuration of network failed\n");
1531                         return -1;
1532                 }
1533 #else /* !DYNAMIC */
1534                 pr_err("IP-Config: Incomplete network configuration information\n");
1535                 ic_close_devs();
1536                 return -1;
1537 #endif /* IPCONFIG_DYNAMIC */
1538         } else {
1539                 /* Device selected manually or only one device -> use it */
1540                 ic_dev = ic_first_dev;
1541         }
1542 
1543         addr = root_nfs_parse_addr(root_server_path);
1544         if (root_server_addr == NONE)
1545                 root_server_addr = addr;
1546 
1547         /*
1548          * Use defaults wherever applicable.
1549          */
1550         if (ic_defaults() < 0)
1551                 return -1;
1552 
1553         /*
1554          * Record which protocol was actually used.
1555          */
1556 #ifdef IPCONFIG_DYNAMIC
1557         ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP);
1558 #endif
1559 
1560 #ifndef IPCONFIG_SILENT
1561         /*
1562          * Clue in the operator.
1563          */
1564         pr_info("IP-Config: Complete:\n");
1565 
1566         pr_info("     device=%s, hwaddr=%*phC, ipaddr=%pI4, mask=%pI4, gw=%pI4\n",
1567                 ic_dev->dev->name, ic_dev->dev->addr_len, ic_dev->dev->dev_addr,
1568                 &ic_myaddr, &ic_netmask, &ic_gateway);
1569         pr_info("     host=%s, domain=%s, nis-domain=%s\n",
1570                 utsname()->nodename, ic_domain, utsname()->domainname);
1571         pr_info("     bootserver=%pI4, rootserver=%pI4, rootpath=%s",
1572                 &ic_servaddr, &root_server_addr, root_server_path);
1573         if (ic_dev_mtu)
1574                 pr_cont(", mtu=%d", ic_dev_mtu);
1575         /* Name servers (if any): */
1576         for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {
1577                 if (ic_nameservers[i] != NONE) {
1578                         if (i == 0)
1579                                 pr_info("     nameserver%u=%pI4",
1580                                         i, &ic_nameservers[i]);
1581                         else
1582                                 pr_cont(", nameserver%u=%pI4",
1583                                         i, &ic_nameservers[i]);
1584                 }
1585                 if (i + 1 == CONF_NAMESERVERS_MAX)
1586                         pr_cont("\n");
1587         }
1588         /* NTP servers (if any): */
1589         for (i = 0; i < CONF_NTP_SERVERS_MAX; i++) {
1590                 if (ic_ntp_servers[i] != NONE) {
1591                         if (i == 0)
1592                                 pr_info("     ntpserver%u=%pI4",
1593                                         i, &ic_ntp_servers[i]);
1594                         else
1595                                 pr_cont(", ntpserver%u=%pI4",
1596                                         i, &ic_ntp_servers[i]);
1597                 }
1598                 if (i + 1 == CONF_NTP_SERVERS_MAX)
1599                         pr_cont("\n");
1600         }
1601 #endif /* !SILENT */
1602 
1603         /*
1604          * Close all network devices except the device we've
1605          * autoconfigured and set up routes.
1606          */
1607         if (ic_setup_if() < 0 || ic_setup_routes() < 0)
1608                 err = -1;
1609         else
1610                 err = 0;
1611 
1612         ic_close_devs();
1613 
1614         return err;
1615 }
1616 
1617 late_initcall(ip_auto_config);
1618 
1619 
1620 /*
1621  *  Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
1622  *  command line parameter.  See Documentation/filesystems/nfs/nfsroot.txt.
1623  */
1624 static int __init ic_proto_name(char *name)
1625 {
1626         if (!strcmp(name, "on") || !strcmp(name, "any")) {
1627                 return 1;
1628         }
1629         if (!strcmp(name, "off") || !strcmp(name, "none")) {
1630                 return 0;
1631         }
1632 #ifdef CONFIG_IP_PNP_DHCP
1633         else if (!strncmp(name, "dhcp", 4)) {
1634                 char *client_id;
1635 
1636                 ic_proto_enabled &= ~IC_RARP;
1637                 client_id = strstr(name, "dhcp,");
1638                 if (client_id) {
1639                         char *v;
1640 
1641                         client_id = client_id + 5;
1642                         v = strchr(client_id, ',');
1643                         if (!v)
1644                                 return 1;
1645                         *v = 0;
1646                         if (kstrtou8(client_id, 0, dhcp_client_identifier))
1647                                 pr_debug("DHCP: Invalid client identifier type\n");
1648                         strncpy(dhcp_client_identifier + 1, v + 1, 251);
1649                         *v = ',';
1650                 }
1651                 return 1;
1652         }
1653 #endif
1654 #ifdef CONFIG_IP_PNP_BOOTP
1655         else if (!strcmp(name, "bootp")) {
1656                 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP);
1657                 return 1;
1658         }
1659 #endif
1660 #ifdef CONFIG_IP_PNP_RARP
1661         else if (!strcmp(name, "rarp")) {
1662                 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP);
1663                 return 1;
1664         }
1665 #endif
1666 #ifdef IPCONFIG_DYNAMIC
1667         else if (!strcmp(name, "both")) {
1668                 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */
1669                 return 1;
1670         }
1671 #endif
1672         return 0;
1673 }
1674 
1675 static int __init ip_auto_config_setup(char *addrs)
1676 {
1677         char *cp, *ip, *dp;
1678         int num = 0;
1679 
1680         ic_set_manually = 1;
1681         ic_enable = 1;
1682 
1683         /*
1684          * If any dhcp, bootp etc options are set, leave autoconfig on
1685          * and skip the below static IP processing.
1686          */
1687         if (ic_proto_name(addrs))
1688                 return 1;
1689 
1690         /* If no static IP is given, turn off autoconfig and bail.  */
1691         if (*addrs == 0 ||
1692             strcmp(addrs, "off") == 0 ||
1693             strcmp(addrs, "none") == 0) {
1694                 ic_enable = 0;
1695                 return 1;
1696         }
1697 
1698         /* Initialise all name servers and NTP servers to NONE */
1699         ic_nameservers_predef();
1700         ic_ntp_servers_predef();
1701 
1702         /* Parse string for static IP assignment.  */
1703         ip = addrs;
1704         while (ip && *ip) {
1705                 if ((cp = strchr(ip, ':')))
1706                         *cp++ = '\0';
1707                 if (strlen(ip) > 0) {
1708                         pr_debug("IP-Config: Parameter #%d: `%s'\n", num, ip);
1709                         switch (num) {
1710                         case 0:
1711                                 if ((ic_myaddr = in_aton(ip)) == ANY)
1712                                         ic_myaddr = NONE;
1713                                 break;
1714                         case 1:
1715                                 if ((ic_servaddr = in_aton(ip)) == ANY)
1716                                         ic_servaddr = NONE;
1717                                 break;
1718                         case 2:
1719                                 if ((ic_gateway = in_aton(ip)) == ANY)
1720                                         ic_gateway = NONE;
1721                                 break;
1722                         case 3:
1723                                 if ((ic_netmask = in_aton(ip)) == ANY)
1724                                         ic_netmask = NONE;
1725                                 break;
1726                         case 4:
1727                                 if ((dp = strchr(ip, '.'))) {
1728                                         *dp++ = '\0';
1729                                         strlcpy(utsname()->domainname, dp,
1730                                                 sizeof(utsname()->domainname));
1731                                 }
1732                                 strlcpy(utsname()->nodename, ip,
1733                                         sizeof(utsname()->nodename));
1734                                 ic_host_name_set = 1;
1735                                 break;
1736                         case 5:
1737                                 strlcpy(user_dev_name, ip, sizeof(user_dev_name));
1738                                 break;
1739                         case 6:
1740                                 if (ic_proto_name(ip) == 0 &&
1741                                     ic_myaddr == NONE) {
1742                                         ic_enable = 0;
1743                                 }
1744                                 break;
1745                         case 7:
1746                                 if (CONF_NAMESERVERS_MAX >= 1) {
1747                                         ic_nameservers[0] = in_aton(ip);
1748                                         if (ic_nameservers[0] == ANY)
1749                                                 ic_nameservers[0] = NONE;
1750                                 }
1751                                 break;
1752                         case 8:
1753                                 if (CONF_NAMESERVERS_MAX >= 2) {
1754                                         ic_nameservers[1] = in_aton(ip);
1755                                         if (ic_nameservers[1] == ANY)
1756                                                 ic_nameservers[1] = NONE;
1757                                 }
1758                                 break;
1759                         case 9:
1760                                 if (CONF_NTP_SERVERS_MAX >= 1) {
1761                                         ic_ntp_servers[0] = in_aton(ip);
1762                                         if (ic_ntp_servers[0] == ANY)
1763                                                 ic_ntp_servers[0] = NONE;
1764                                 }
1765                                 break;
1766                         }
1767                 }
1768                 ip = cp;
1769                 num++;
1770         }
1771 
1772         return 1;
1773 }
1774 __setup("ip=", ip_auto_config_setup);
1775 
1776 static int __init nfsaddrs_config_setup(char *addrs)
1777 {
1778         return ip_auto_config_setup(addrs);
1779 }
1780 __setup("nfsaddrs=", nfsaddrs_config_setup);
1781 
1782 static int __init vendor_class_identifier_setup(char *addrs)
1783 {
1784         if (strlcpy(vendor_class_identifier, addrs,
1785                     sizeof(vendor_class_identifier))
1786             >= sizeof(vendor_class_identifier))
1787                 pr_warn("DHCP: vendorclass too long, truncated to \"%s\"\n",
1788                         vendor_class_identifier);
1789         return 1;
1790 }
1791 __setup("dhcpclass=", vendor_class_identifier_setup);
1792 

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