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

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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 
 33 #include <linux/types.h>
 34 #include <linux/string.h>
 35 #include <linux/kernel.h>
 36 #include <linux/jiffies.h>
 37 #include <linux/random.h>
 38 #include <linux/init.h>
 39 #include <linux/utsname.h>
 40 #include <linux/in.h>
 41 #include <linux/if.h>
 42 #include <linux/inet.h>
 43 #include <linux/inetdevice.h>
 44 #include <linux/netdevice.h>
 45 #include <linux/if_arp.h>
 46 #include <linux/skbuff.h>
 47 #include <linux/ip.h>
 48 #include <linux/socket.h>
 49 #include <linux/route.h>
 50 #include <linux/udp.h>
 51 #include <linux/proc_fs.h>
 52 #include <linux/seq_file.h>
 53 #include <linux/major.h>
 54 #include <linux/root_dev.h>
 55 #include <linux/delay.h>
 56 #include <linux/nfs_fs.h>
 57 #include <linux/slab.h>
 58 #include <linux/export.h>
 59 #include <net/net_namespace.h>
 60 #include <net/arp.h>
 61 #include <net/dsa.h>
 62 #include <net/ip.h>
 63 #include <net/ipconfig.h>
 64 #include <net/route.h>
 65 
 66 #include <linux/uaccess.h>
 67 #include <net/checksum.h>
 68 #include <asm/processor.h>
 69 
 70 #if defined(CONFIG_IP_PNP_DHCP)
 71 #define IPCONFIG_DHCP
 72 #endif
 73 #if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_DHCP)
 74 #define IPCONFIG_BOOTP
 75 #endif
 76 #if defined(CONFIG_IP_PNP_RARP)
 77 #define IPCONFIG_RARP
 78 #endif
 79 #if defined(IPCONFIG_BOOTP) || defined(IPCONFIG_RARP)
 80 #define IPCONFIG_DYNAMIC
 81 #endif
 82 
 83 /* Define the friendly delay before and after opening net devices */
 84 #define CONF_POST_OPEN          10      /* After opening: 10 msecs */
 85 #define CONF_CARRIER_TIMEOUT    120000  /* Wait for carrier timeout */
 86 
 87 /* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */
 88 #define CONF_OPEN_RETRIES       2       /* (Re)open devices twice */
 89 #define CONF_SEND_RETRIES       6       /* Send six requests per open */
 90 #define CONF_BASE_TIMEOUT       (HZ*2)  /* Initial timeout: 2 seconds */
 91 #define CONF_TIMEOUT_RANDOM     (HZ)    /* Maximum amount of randomization */
 92 #define CONF_TIMEOUT_MULT       *7/4    /* Rate of timeout growth */
 93 #define CONF_TIMEOUT_MAX        (HZ*30) /* Maximum allowed timeout */
 94 #define CONF_NAMESERVERS_MAX   3       /* Maximum number of nameservers
 95                                            - '3' from resolv.h */
 96 
 97 #define NONE cpu_to_be32(INADDR_NONE)
 98 #define ANY cpu_to_be32(INADDR_ANY)
 99 
100 /*
101  * Public IP configuration
102  */
103 
104 /* This is used by platforms which might be able to set the ipconfig
105  * variables using firmware environment vars.  If this is set, it will
106  * ignore such firmware variables.
107  */
108 int ic_set_manually __initdata = 0;             /* IPconfig parameters set manually */
109 
110 static int ic_enable __initdata;                /* IP config enabled? */
111 
112 /* Protocol choice */
113 int ic_proto_enabled __initdata = 0
114 #ifdef IPCONFIG_BOOTP
115                         | IC_BOOTP
116 #endif
117 #ifdef CONFIG_IP_PNP_DHCP
118                         | IC_USE_DHCP
119 #endif
120 #ifdef IPCONFIG_RARP
121                         | IC_RARP
122 #endif
123                         ;
124 
125 static int ic_host_name_set __initdata; /* Host name set by us? */
126 
127 __be32 ic_myaddr = NONE;                /* My IP address */
128 static __be32 ic_netmask = NONE;        /* Netmask for local subnet */
129 __be32 ic_gateway = NONE;       /* Gateway IP address */
130 
131 #ifdef IPCONFIG_DYNAMIC
132 static __be32 ic_addrservaddr = NONE;   /* IP Address of the IP addresses'server */
133 #endif
134 
135 __be32 ic_servaddr = NONE;      /* Boot server IP address */
136 
137 __be32 root_server_addr = NONE; /* Address of NFS server */
138 u8 root_server_path[256] = { 0, };      /* Path to mount as root */
139 
140 /* vendor class identifier */
141 static char vendor_class_identifier[253] __initdata;
142 
143 #if defined(CONFIG_IP_PNP_DHCP)
144 static char dhcp_client_identifier[253] __initdata;
145 #endif
146 
147 /* Persistent data: */
148 
149 #ifdef IPCONFIG_DYNAMIC
150 static int ic_proto_used;                       /* Protocol used, if any */
151 #else
152 #define ic_proto_used 0
153 #endif
154 static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */
155 static u8 ic_domain[64];                /* DNS (not NIS) domain name */
156 
157 /*
158  * Private state.
159  */
160 
161 /* Name of user-selected boot device */
162 static char user_dev_name[IFNAMSIZ] __initdata = { 0, };
163 
164 /* Protocols supported by available interfaces */
165 static int ic_proto_have_if __initdata;
166 
167 /* MTU for boot device */
168 static int ic_dev_mtu __initdata;
169 
170 #ifdef IPCONFIG_DYNAMIC
171 static DEFINE_SPINLOCK(ic_recv_lock);
172 static volatile int ic_got_reply __initdata;    /* Proto(s) that replied */
173 #endif
174 #ifdef IPCONFIG_DHCP
175 static int ic_dhcp_msgtype __initdata;  /* DHCP msg type received */
176 #endif
177 
178 
179 /*
180  *      Network devices
181  */
182 
183 struct ic_device {
184         struct ic_device *next;
185         struct net_device *dev;
186         unsigned short flags;
187         short able;
188         __be32 xid;
189 };
190 
191 static struct ic_device *ic_first_dev __initdata;       /* List of open device */
192 static struct ic_device *ic_dev __initdata;             /* Selected device */
193 
194 static bool __init ic_is_init_dev(struct net_device *dev)
195 {
196         if (dev->flags & IFF_LOOPBACK)
197                 return false;
198         return user_dev_name[0] ? !strcmp(dev->name, user_dev_name) :
199             (!(dev->flags & IFF_LOOPBACK) &&
200              (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) &&
201              strncmp(dev->name, "dummy", 5));
202 }
203 
204 static int __init ic_open_devs(void)
205 {
206         struct ic_device *d, **last;
207         struct net_device *dev;
208         unsigned short oflags;
209         unsigned long start, next_msg;
210 
211         last = &ic_first_dev;
212         rtnl_lock();
213 
214         /* bring loopback and DSA master network devices up first */
215         for_each_netdev(&init_net, dev) {
216                 if (!(dev->flags & IFF_LOOPBACK) && !netdev_uses_dsa(dev))
217                         continue;
218                 if (dev_change_flags(dev, dev->flags | IFF_UP) < 0)
219                         pr_err("IP-Config: Failed to open %s\n", dev->name);
220         }
221 
222         for_each_netdev(&init_net, dev) {
223                 if (ic_is_init_dev(dev)) {
224                         int able = 0;
225                         if (dev->mtu >= 364)
226                                 able |= IC_BOOTP;
227                         else
228                                 pr_warn("DHCP/BOOTP: Ignoring device %s, MTU %d too small\n",
229                                         dev->name, dev->mtu);
230                         if (!(dev->flags & IFF_NOARP))
231                                 able |= IC_RARP;
232                         able &= ic_proto_enabled;
233                         if (ic_proto_enabled && !able)
234                                 continue;
235                         oflags = dev->flags;
236                         if (dev_change_flags(dev, oflags | IFF_UP) < 0) {
237                                 pr_err("IP-Config: Failed to open %s\n",
238                                        dev->name);
239                                 continue;
240                         }
241                         if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) {
242                                 rtnl_unlock();
243                                 return -ENOMEM;
244                         }
245                         d->dev = dev;
246                         *last = d;
247                         last = &d->next;
248                         d->flags = oflags;
249                         d->able = able;
250                         if (able & IC_BOOTP)
251                                 get_random_bytes(&d->xid, sizeof(__be32));
252                         else
253                                 d->xid = 0;
254                         ic_proto_have_if |= able;
255                         pr_debug("IP-Config: %s UP (able=%d, xid=%08x)\n",
256                                  dev->name, able, d->xid);
257                 }
258         }
259 
260         /* no point in waiting if we could not bring up at least one device */
261         if (!ic_first_dev)
262                 goto have_carrier;
263 
264         /* wait for a carrier on at least one device */
265         start = jiffies;
266         next_msg = start + msecs_to_jiffies(CONF_CARRIER_TIMEOUT/12);
267         while (time_before(jiffies, start +
268                            msecs_to_jiffies(CONF_CARRIER_TIMEOUT))) {
269                 int wait, elapsed;
270 
271                 for_each_netdev(&init_net, dev)
272                         if (ic_is_init_dev(dev) && netif_carrier_ok(dev))
273                                 goto have_carrier;
274 
275                 msleep(1);
276 
277                 if (time_before(jiffies, next_msg))
278                         continue;
279 
280                 elapsed = jiffies_to_msecs(jiffies - start);
281                 wait = (CONF_CARRIER_TIMEOUT - elapsed + 500)/1000;
282                 pr_info("Waiting up to %d more seconds for network.\n", wait);
283                 next_msg = jiffies + msecs_to_jiffies(CONF_CARRIER_TIMEOUT/12);
284         }
285 have_carrier:
286         rtnl_unlock();
287 
288         *last = NULL;
289 
290         if (!ic_first_dev) {
291                 if (user_dev_name[0])
292                         pr_err("IP-Config: Device `%s' not found\n",
293                                user_dev_name);
294                 else
295                         pr_err("IP-Config: No network devices available\n");
296                 return -ENODEV;
297         }
298         return 0;
299 }
300 
301 static void __init ic_close_devs(void)
302 {
303         struct ic_device *d, *next;
304         struct net_device *dev;
305 
306         rtnl_lock();
307         next = ic_first_dev;
308         while ((d = next)) {
309                 next = d->next;
310                 dev = d->dev;
311                 if (d != ic_dev && !netdev_uses_dsa(dev)) {
312                         pr_debug("IP-Config: Downing %s\n", dev->name);
313                         dev_change_flags(dev, d->flags);
314                 }
315                 kfree(d);
316         }
317         rtnl_unlock();
318 }
319 
320 /*
321  *      Interface to various network functions.
322  */
323 
324 static inline void
325 set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port)
326 {
327         sin->sin_family = AF_INET;
328         sin->sin_addr.s_addr = addr;
329         sin->sin_port = port;
330 }
331 
332 static int __init ic_devinet_ioctl(unsigned int cmd, struct ifreq *arg)
333 {
334         int res;
335 
336         mm_segment_t oldfs = get_fs();
337         set_fs(get_ds());
338         res = devinet_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
339         set_fs(oldfs);
340         return res;
341 }
342 
343 static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg)
344 {
345         int res;
346 
347         mm_segment_t oldfs = get_fs();
348         set_fs(get_ds());
349         res = dev_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
350         set_fs(oldfs);
351         return res;
352 }
353 
354 static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg)
355 {
356         int res;
357 
358         mm_segment_t oldfs = get_fs();
359         set_fs(get_ds());
360         res = ip_rt_ioctl(&init_net, cmd, (void __user *) arg);
361         set_fs(oldfs);
362         return res;
363 }
364 
365 /*
366  *      Set up interface addresses and routes.
367  */
368 
369 static int __init ic_setup_if(void)
370 {
371         struct ifreq ir;
372         struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr;
373         int err;
374 
375         memset(&ir, 0, sizeof(ir));
376         strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->dev->name);
377         set_sockaddr(sin, ic_myaddr, 0);
378         if ((err = ic_devinet_ioctl(SIOCSIFADDR, &ir)) < 0) {
379                 pr_err("IP-Config: Unable to set interface address (%d)\n",
380                        err);
381                 return -1;
382         }
383         set_sockaddr(sin, ic_netmask, 0);
384         if ((err = ic_devinet_ioctl(SIOCSIFNETMASK, &ir)) < 0) {
385                 pr_err("IP-Config: Unable to set interface netmask (%d)\n",
386                        err);
387                 return -1;
388         }
389         set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0);
390         if ((err = ic_devinet_ioctl(SIOCSIFBRDADDR, &ir)) < 0) {
391                 pr_err("IP-Config: Unable to set interface broadcast address (%d)\n",
392                        err);
393                 return -1;
394         }
395         /* Handle the case where we need non-standard MTU on the boot link (a network
396          * using jumbo frames, for instance).  If we can't set the mtu, don't error
397          * out, we'll try to muddle along.
398          */
399         if (ic_dev_mtu != 0) {
400                 strcpy(ir.ifr_name, ic_dev->dev->name);
401                 ir.ifr_mtu = ic_dev_mtu;
402                 if ((err = ic_dev_ioctl(SIOCSIFMTU, &ir)) < 0)
403                         pr_err("IP-Config: Unable to set interface mtu to %d (%d)\n",
404                                ic_dev_mtu, err);
405         }
406         return 0;
407 }
408 
409 static int __init ic_setup_routes(void)
410 {
411         /* No need to setup device routes, only the default route... */
412 
413         if (ic_gateway != NONE) {
414                 struct rtentry rm;
415                 int err;
416 
417                 memset(&rm, 0, sizeof(rm));
418                 if ((ic_gateway ^ ic_myaddr) & ic_netmask) {
419                         pr_err("IP-Config: Gateway not on directly connected network\n");
420                         return -1;
421                 }
422                 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0);
423                 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0);
424                 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0);
425                 rm.rt_flags = RTF_UP | RTF_GATEWAY;
426                 if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) {
427                         pr_err("IP-Config: Cannot add default route (%d)\n",
428                                err);
429                         return -1;
430                 }
431         }
432 
433         return 0;
434 }
435 
436 /*
437  *      Fill in default values for all missing parameters.
438  */
439 
440 static int __init ic_defaults(void)
441 {
442         /*
443          *      At this point we have no userspace running so need not
444          *      claim locks on system_utsname
445          */
446 
447         if (!ic_host_name_set)
448                 sprintf(init_utsname()->nodename, "%pI4", &ic_myaddr);
449 
450         if (root_server_addr == NONE)
451                 root_server_addr = ic_servaddr;
452 
453         if (ic_netmask == NONE) {
454                 if (IN_CLASSA(ntohl(ic_myaddr)))
455                         ic_netmask = htonl(IN_CLASSA_NET);
456                 else if (IN_CLASSB(ntohl(ic_myaddr)))
457                         ic_netmask = htonl(IN_CLASSB_NET);
458                 else if (IN_CLASSC(ntohl(ic_myaddr)))
459                         ic_netmask = htonl(IN_CLASSC_NET);
460                 else {
461                         pr_err("IP-Config: Unable to guess netmask for address %pI4\n",
462                                &ic_myaddr);
463                         return -1;
464                 }
465                 pr_notice("IP-Config: Guessing netmask %pI4\n",
466                           &ic_netmask);
467         }
468 
469         return 0;
470 }
471 
472 /*
473  *      RARP support.
474  */
475 
476 #ifdef IPCONFIG_RARP
477 
478 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
479 
480 static struct packet_type rarp_packet_type __initdata = {
481         .type = cpu_to_be16(ETH_P_RARP),
482         .func = ic_rarp_recv,
483 };
484 
485 static inline void __init ic_rarp_init(void)
486 {
487         dev_add_pack(&rarp_packet_type);
488 }
489 
490 static inline void __init ic_rarp_cleanup(void)
491 {
492         dev_remove_pack(&rarp_packet_type);
493 }
494 
495 /*
496  *  Process received RARP packet.
497  */
498 static int __init
499 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
500 {
501         struct arphdr *rarp;
502         unsigned char *rarp_ptr;
503         __be32 sip, tip;
504         unsigned char *tha;             /* t for "target" */
505         struct ic_device *d;
506 
507         if (!net_eq(dev_net(dev), &init_net))
508                 goto drop;
509 
510         skb = skb_share_check(skb, GFP_ATOMIC);
511         if (!skb)
512                 return NET_RX_DROP;
513 
514         if (!pskb_may_pull(skb, sizeof(struct arphdr)))
515                 goto drop;
516 
517         /* Basic sanity checks can be done without the lock.  */
518         rarp = (struct arphdr *)skb_transport_header(skb);
519 
520         /* If this test doesn't pass, it's not IP, or we should
521          * ignore it anyway.
522          */
523         if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd))
524                 goto drop;
525 
526         /* If it's not a RARP reply, delete it. */
527         if (rarp->ar_op != htons(ARPOP_RREPLY))
528                 goto drop;
529 
530         /* If it's not Ethernet, delete it. */
531         if (rarp->ar_pro != htons(ETH_P_IP))
532                 goto drop;
533 
534         if (!pskb_may_pull(skb, arp_hdr_len(dev)))
535                 goto drop;
536 
537         /* OK, it is all there and looks valid, process... */
538         rarp = (struct arphdr *)skb_transport_header(skb);
539         rarp_ptr = (unsigned char *) (rarp + 1);
540 
541         /* One reply at a time, please. */
542         spin_lock(&ic_recv_lock);
543 
544         /* If we already have a reply, just drop the packet */
545         if (ic_got_reply)
546                 goto drop_unlock;
547 
548         /* Find the ic_device that the packet arrived on */
549         d = ic_first_dev;
550         while (d && d->dev != dev)
551                 d = d->next;
552         if (!d)
553                 goto drop_unlock;       /* should never happen */
554 
555         /* Extract variable-width fields */
556         rarp_ptr += dev->addr_len;
557         memcpy(&sip, rarp_ptr, 4);
558         rarp_ptr += 4;
559         tha = rarp_ptr;
560         rarp_ptr += dev->addr_len;
561         memcpy(&tip, rarp_ptr, 4);
562 
563         /* Discard packets which are not meant for us. */
564         if (memcmp(tha, dev->dev_addr, dev->addr_len))
565                 goto drop_unlock;
566 
567         /* Discard packets which are not from specified server. */
568         if (ic_servaddr != NONE && ic_servaddr != sip)
569                 goto drop_unlock;
570 
571         /* We have a winner! */
572         ic_dev = d;
573         if (ic_myaddr == NONE)
574                 ic_myaddr = tip;
575         ic_servaddr = sip;
576         ic_addrservaddr = sip;
577         ic_got_reply = IC_RARP;
578 
579 drop_unlock:
580         /* Show's over.  Nothing to see here.  */
581         spin_unlock(&ic_recv_lock);
582 
583 drop:
584         /* Throw the packet out. */
585         kfree_skb(skb);
586         return 0;
587 }
588 
589 
590 /*
591  *  Send RARP request packet over a single interface.
592  */
593 static void __init ic_rarp_send_if(struct ic_device *d)
594 {
595         struct net_device *dev = d->dev;
596         arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL,
597                  dev->dev_addr, dev->dev_addr);
598 }
599 #endif
600 
601 /*
602  *  Predefine Nameservers
603  */
604 static inline void __init ic_nameservers_predef(void)
605 {
606         int i;
607 
608         for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
609                 ic_nameservers[i] = NONE;
610 }
611 
612 /*
613  *      DHCP/BOOTP support.
614  */
615 
616 #ifdef IPCONFIG_BOOTP
617 
618 struct bootp_pkt {              /* BOOTP packet format */
619         struct iphdr iph;       /* IP header */
620         struct udphdr udph;     /* UDP header */
621         u8 op;                  /* 1=request, 2=reply */
622         u8 htype;               /* HW address type */
623         u8 hlen;                /* HW address length */
624         u8 hops;                /* Used only by gateways */
625         __be32 xid;             /* Transaction ID */
626         __be16 secs;            /* Seconds since we started */
627         __be16 flags;           /* Just what it says */
628         __be32 client_ip;               /* Client's IP address if known */
629         __be32 your_ip;         /* Assigned IP address */
630         __be32 server_ip;               /* (Next, e.g. NFS) Server's IP address */
631         __be32 relay_ip;                /* IP address of BOOTP relay */
632         u8 hw_addr[16];         /* Client's HW address */
633         u8 serv_name[64];       /* Server host name */
634         u8 boot_file[128];      /* Name of boot file */
635         u8 exten[312];          /* DHCP options / BOOTP vendor extensions */
636 };
637 
638 /* packet ops */
639 #define BOOTP_REQUEST   1
640 #define BOOTP_REPLY     2
641 
642 /* DHCP message types */
643 #define DHCPDISCOVER    1
644 #define DHCPOFFER       2
645 #define DHCPREQUEST     3
646 #define DHCPDECLINE     4
647 #define DHCPACK         5
648 #define DHCPNAK         6
649 #define DHCPRELEASE     7
650 #define DHCPINFORM      8
651 
652 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
653 
654 static struct packet_type bootp_packet_type __initdata = {
655         .type = cpu_to_be16(ETH_P_IP),
656         .func = ic_bootp_recv,
657 };
658 
659 /*
660  *  Initialize DHCP/BOOTP extension fields in the request.
661  */
662 
663 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 };
664 
665 #ifdef IPCONFIG_DHCP
666 
667 static void __init
668 ic_dhcp_init_options(u8 *options, struct ic_device *d)
669 {
670         u8 mt = ((ic_servaddr == NONE)
671                  ? DHCPDISCOVER : DHCPREQUEST);
672         u8 *e = options;
673         int len;
674 
675         pr_debug("DHCP: Sending message type %d (%s)\n", mt, d->dev->name);
676 
677         memcpy(e, ic_bootp_cookie, 4);  /* RFC1048 Magic Cookie */
678         e += 4;
679 
680         *e++ = 53;              /* DHCP message type */
681         *e++ = 1;
682         *e++ = mt;
683 
684         if (mt == DHCPREQUEST) {
685                 *e++ = 54;      /* Server ID (IP address) */
686                 *e++ = 4;
687                 memcpy(e, &ic_servaddr, 4);
688                 e += 4;
689 
690                 *e++ = 50;      /* Requested IP address */
691                 *e++ = 4;
692                 memcpy(e, &ic_myaddr, 4);
693                 e += 4;
694         }
695 
696         /* always? */
697         {
698                 static const u8 ic_req_params[] = {
699                         1,      /* Subnet mask */
700                         3,      /* Default gateway */
701                         6,      /* DNS server */
702                         12,     /* Host name */
703                         15,     /* Domain name */
704                         17,     /* Boot path */
705                         26,     /* MTU */
706                         40,     /* NIS domain name */
707                 };
708 
709                 *e++ = 55;      /* Parameter request list */
710                 *e++ = sizeof(ic_req_params);
711                 memcpy(e, ic_req_params, sizeof(ic_req_params));
712                 e += sizeof(ic_req_params);
713 
714                 if (ic_host_name_set) {
715                         *e++ = 12;      /* host-name */
716                         len = strlen(utsname()->nodename);
717                         *e++ = len;
718                         memcpy(e, utsname()->nodename, len);
719                         e += len;
720                 }
721                 if (*vendor_class_identifier) {
722                         pr_info("DHCP: sending class identifier \"%s\"\n",
723                                 vendor_class_identifier);
724                         *e++ = 60;      /* Class-identifier */
725                         len = strlen(vendor_class_identifier);
726                         *e++ = len;
727                         memcpy(e, vendor_class_identifier, len);
728                         e += len;
729                 }
730                 len = strlen(dhcp_client_identifier + 1);
731                 /* the minimum length of identifier is 2, include 1 byte type,
732                  * and can not be larger than the length of options
733                  */
734                 if (len >= 1 && len < 312 - (e - options) - 1) {
735                         *e++ = 61;
736                         *e++ = len + 1;
737                         memcpy(e, dhcp_client_identifier, len + 1);
738                         e += len + 1;
739                 }
740         }
741 
742         *e++ = 255;     /* End of the list */
743 }
744 
745 #endif /* IPCONFIG_DHCP */
746 
747 static void __init ic_bootp_init_ext(u8 *e)
748 {
749         memcpy(e, ic_bootp_cookie, 4);  /* RFC1048 Magic Cookie */
750         e += 4;
751         *e++ = 1;               /* Subnet mask request */
752         *e++ = 4;
753         e += 4;
754         *e++ = 3;               /* Default gateway request */
755         *e++ = 4;
756         e += 4;
757         *e++ = 5;               /* Name server request */
758         *e++ = 8;
759         e += 8;
760         *e++ = 12;              /* Host name request */
761         *e++ = 32;
762         e += 32;
763         *e++ = 40;              /* NIS Domain name request */
764         *e++ = 32;
765         e += 32;
766         *e++ = 17;              /* Boot path */
767         *e++ = 40;
768         e += 40;
769 
770         *e++ = 57;              /* set extension buffer size for reply */
771         *e++ = 2;
772         *e++ = 1;               /* 128+236+8+20+14, see dhcpd sources */
773         *e++ = 150;
774 
775         *e++ = 255;             /* End of the list */
776 }
777 
778 
779 /*
780  *  Initialize the DHCP/BOOTP mechanism.
781  */
782 static inline void __init ic_bootp_init(void)
783 {
784         ic_nameservers_predef();
785 
786         dev_add_pack(&bootp_packet_type);
787 }
788 
789 
790 /*
791  *  DHCP/BOOTP cleanup.
792  */
793 static inline void __init ic_bootp_cleanup(void)
794 {
795         dev_remove_pack(&bootp_packet_type);
796 }
797 
798 
799 /*
800  *  Send DHCP/BOOTP request to single interface.
801  */
802 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff)
803 {
804         struct net_device *dev = d->dev;
805         struct sk_buff *skb;
806         struct bootp_pkt *b;
807         struct iphdr *h;
808         int hlen = LL_RESERVED_SPACE(dev);
809         int tlen = dev->needed_tailroom;
810 
811         /* Allocate packet */
812         skb = alloc_skb(sizeof(struct bootp_pkt) + hlen + tlen + 15,
813                         GFP_KERNEL);
814         if (!skb)
815                 return;
816         skb_reserve(skb, hlen);
817         b = skb_put_zero(skb, sizeof(struct bootp_pkt));
818 
819         /* Construct IP header */
820         skb_reset_network_header(skb);
821         h = ip_hdr(skb);
822         h->version = 4;
823         h->ihl = 5;
824         h->tot_len = htons(sizeof(struct bootp_pkt));
825         h->frag_off = htons(IP_DF);
826         h->ttl = 64;
827         h->protocol = IPPROTO_UDP;
828         h->daddr = htonl(INADDR_BROADCAST);
829         h->check = ip_fast_csum((unsigned char *) h, h->ihl);
830 
831         /* Construct UDP header */
832         b->udph.source = htons(68);
833         b->udph.dest = htons(67);
834         b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr));
835         /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */
836 
837         /* Construct DHCP/BOOTP header */
838         b->op = BOOTP_REQUEST;
839         if (dev->type < 256) /* check for false types */
840                 b->htype = dev->type;
841         else if (dev->type == ARPHRD_FDDI)
842                 b->htype = ARPHRD_ETHER;
843         else {
844                 pr_warn("Unknown ARP type 0x%04x for device %s\n", dev->type,
845                         dev->name);
846                 b->htype = dev->type; /* can cause undefined behavior */
847         }
848 
849         /* server_ip and your_ip address are both already zero per RFC2131 */
850         b->hlen = dev->addr_len;
851         memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
852         b->secs = htons(jiffies_diff / HZ);
853         b->xid = d->xid;
854 
855         /* add DHCP options or BOOTP extensions */
856 #ifdef IPCONFIG_DHCP
857         if (ic_proto_enabled & IC_USE_DHCP)
858                 ic_dhcp_init_options(b->exten, d);
859         else
860 #endif
861                 ic_bootp_init_ext(b->exten);
862 
863         /* Chain packet down the line... */
864         skb->dev = dev;
865         skb->protocol = htons(ETH_P_IP);
866         if (dev_hard_header(skb, dev, ntohs(skb->protocol),
867                             dev->broadcast, dev->dev_addr, skb->len) < 0) {
868                 kfree_skb(skb);
869                 printk("E");
870                 return;
871         }
872 
873         if (dev_queue_xmit(skb) < 0)
874                 printk("E");
875 }
876 
877 
878 /*
879  *  Copy BOOTP-supplied string if not already set.
880  */
881 static int __init ic_bootp_string(char *dest, char *src, int len, int max)
882 {
883         if (!len)
884                 return 0;
885         if (len > max-1)
886                 len = max-1;
887         memcpy(dest, src, len);
888         dest[len] = '\0';
889         return 1;
890 }
891 
892 
893 /*
894  *  Process BOOTP extensions.
895  */
896 static void __init ic_do_bootp_ext(u8 *ext)
897 {
898         u8 servers;
899         int i;
900         __be16 mtu;
901 
902         u8 *c;
903 
904         pr_debug("DHCP/BOOTP: Got extension %d:", *ext);
905         for (c=ext+2; c<ext+2+ext[1]; c++)
906                 pr_debug(" %02x", *c);
907         pr_debug("\n");
908 
909         switch (*ext++) {
910         case 1:         /* Subnet mask */
911                 if (ic_netmask == NONE)
912                         memcpy(&ic_netmask, ext+1, 4);
913                 break;
914         case 3:         /* Default gateway */
915                 if (ic_gateway == NONE)
916                         memcpy(&ic_gateway, ext+1, 4);
917                 break;
918         case 6:         /* DNS server */
919                 servers= *ext/4;
920                 if (servers > CONF_NAMESERVERS_MAX)
921                         servers = CONF_NAMESERVERS_MAX;
922                 for (i = 0; i < servers; i++) {
923                         if (ic_nameservers[i] == NONE)
924                                 memcpy(&ic_nameservers[i], ext+1+4*i, 4);
925                 }
926                 break;
927         case 12:        /* Host name */
928                 ic_bootp_string(utsname()->nodename, ext+1, *ext,
929                                 __NEW_UTS_LEN);
930                 ic_host_name_set = 1;
931                 break;
932         case 15:        /* Domain name (DNS) */
933                 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
934                 break;
935         case 17:        /* Root path */
936                 if (!root_server_path[0])
937                         ic_bootp_string(root_server_path, ext+1, *ext,
938                                         sizeof(root_server_path));
939                 break;
940         case 26:        /* Interface MTU */
941                 memcpy(&mtu, ext+1, sizeof(mtu));
942                 ic_dev_mtu = ntohs(mtu);
943                 break;
944         case 40:        /* NIS Domain name (_not_ DNS) */
945                 ic_bootp_string(utsname()->domainname, ext+1, *ext,
946                                 __NEW_UTS_LEN);
947                 break;
948         }
949 }
950 
951 
952 /*
953  *  Receive BOOTP reply.
954  */
955 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
956 {
957         struct bootp_pkt *b;
958         struct iphdr *h;
959         struct ic_device *d;
960         int len, ext_len;
961 
962         if (!net_eq(dev_net(dev), &init_net))
963                 goto drop;
964 
965         /* Perform verifications before taking the lock.  */
966         if (skb->pkt_type == PACKET_OTHERHOST)
967                 goto drop;
968 
969         skb = skb_share_check(skb, GFP_ATOMIC);
970         if (!skb)
971                 return NET_RX_DROP;
972 
973         if (!pskb_may_pull(skb,
974                            sizeof(struct iphdr) +
975                            sizeof(struct udphdr)))
976                 goto drop;
977 
978         b = (struct bootp_pkt *)skb_network_header(skb);
979         h = &b->iph;
980 
981         if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP)
982                 goto drop;
983 
984         /* Fragments are not supported */
985         if (ip_is_fragment(h)) {
986                 net_err_ratelimited("DHCP/BOOTP: Ignoring fragmented reply\n");
987                 goto drop;
988         }
989 
990         if (skb->len < ntohs(h->tot_len))
991                 goto drop;
992 
993         if (ip_fast_csum((char *) h, h->ihl))
994                 goto drop;
995 
996         if (b->udph.source != htons(67) || b->udph.dest != htons(68))
997                 goto drop;
998 
999         if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
1000                 goto drop;
1001 
1002         len = ntohs(b->udph.len) - sizeof(struct udphdr);
1003         ext_len = len - (sizeof(*b) -
1004                          sizeof(struct iphdr) -
1005                          sizeof(struct udphdr) -
1006                          sizeof(b->exten));
1007         if (ext_len < 0)
1008                 goto drop;
1009 
1010         /* Ok the front looks good, make sure we can get at the rest.  */
1011         if (!pskb_may_pull(skb, skb->len))
1012                 goto drop;
1013 
1014         b = (struct bootp_pkt *)skb_network_header(skb);
1015         h = &b->iph;
1016 
1017         /* One reply at a time, please. */
1018         spin_lock(&ic_recv_lock);
1019 
1020         /* If we already have a reply, just drop the packet */
1021         if (ic_got_reply)
1022                 goto drop_unlock;
1023 
1024         /* Find the ic_device that the packet arrived on */
1025         d = ic_first_dev;
1026         while (d && d->dev != dev)
1027                 d = d->next;
1028         if (!d)
1029                 goto drop_unlock;  /* should never happen */
1030 
1031         /* Is it a reply to our BOOTP request? */
1032         if (b->op != BOOTP_REPLY ||
1033             b->xid != d->xid) {
1034                 net_err_ratelimited("DHCP/BOOTP: Reply not for us on %s, op[%x] xid[%x]\n",
1035                                     d->dev->name, b->op, b->xid);
1036                 goto drop_unlock;
1037         }
1038 
1039         /* Parse extensions */
1040         if (ext_len >= 4 &&
1041             !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */
1042                 u8 *end = (u8 *) b + ntohs(b->iph.tot_len);
1043                 u8 *ext;
1044 
1045 #ifdef IPCONFIG_DHCP
1046                 if (ic_proto_enabled & IC_USE_DHCP) {
1047                         __be32 server_id = NONE;
1048                         int mt = 0;
1049 
1050                         ext = &b->exten[4];
1051                         while (ext < end && *ext != 0xff) {
1052                                 u8 *opt = ext++;
1053                                 if (*opt == 0)  /* Padding */
1054                                         continue;
1055                                 ext += *ext + 1;
1056                                 if (ext >= end)
1057                                         break;
1058                                 switch (*opt) {
1059                                 case 53:        /* Message type */
1060                                         if (opt[1])
1061                                                 mt = opt[2];
1062                                         break;
1063                                 case 54:        /* Server ID (IP address) */
1064                                         if (opt[1] >= 4)
1065                                                 memcpy(&server_id, opt + 2, 4);
1066                                         break;
1067                                 }
1068                         }
1069 
1070                         pr_debug("DHCP: Got message type %d (%s)\n", mt, d->dev->name);
1071 
1072                         switch (mt) {
1073                         case DHCPOFFER:
1074                                 /* While in the process of accepting one offer,
1075                                  * ignore all others.
1076                                  */
1077                                 if (ic_myaddr != NONE)
1078                                         goto drop_unlock;
1079 
1080                                 /* Let's accept that offer. */
1081                                 ic_myaddr = b->your_ip;
1082                                 ic_servaddr = server_id;
1083                                 pr_debug("DHCP: Offered address %pI4 by server %pI4\n",
1084                                          &ic_myaddr, &b->iph.saddr);
1085                                 /* The DHCP indicated server address takes
1086                                  * precedence over the bootp header one if
1087                                  * they are different.
1088                                  */
1089                                 if ((server_id != NONE) &&
1090                                     (b->server_ip != server_id))
1091                                         b->server_ip = ic_servaddr;
1092                                 break;
1093 
1094                         case DHCPACK:
1095                                 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0)
1096                                         goto drop_unlock;
1097 
1098                                 /* Yeah! */
1099                                 break;
1100 
1101                         default:
1102                                 /* Urque.  Forget it*/
1103                                 ic_myaddr = NONE;
1104                                 ic_servaddr = NONE;
1105                                 goto drop_unlock;
1106                         }
1107 
1108                         ic_dhcp_msgtype = mt;
1109 
1110                 }
1111 #endif /* IPCONFIG_DHCP */
1112 
1113                 ext = &b->exten[4];
1114                 while (ext < end && *ext != 0xff) {
1115                         u8 *opt = ext++;
1116                         if (*opt == 0)  /* Padding */
1117                                 continue;
1118                         ext += *ext + 1;
1119                         if (ext < end)
1120                                 ic_do_bootp_ext(opt);
1121                 }
1122         }
1123 
1124         /* We have a winner! */
1125         ic_dev = d;
1126         ic_myaddr = b->your_ip;
1127         ic_servaddr = b->server_ip;
1128         ic_addrservaddr = b->iph.saddr;
1129         if (ic_gateway == NONE && b->relay_ip)
1130                 ic_gateway = b->relay_ip;
1131         if (ic_nameservers[0] == NONE)
1132                 ic_nameservers[0] = ic_servaddr;
1133         ic_got_reply = IC_BOOTP;
1134 
1135 drop_unlock:
1136         /* Show's over.  Nothing to see here.  */
1137         spin_unlock(&ic_recv_lock);
1138 
1139 drop:
1140         /* Throw the packet out. */
1141         kfree_skb(skb);
1142 
1143         return 0;
1144 }
1145 
1146 
1147 #endif
1148 
1149 
1150 /*
1151  *      Dynamic IP configuration -- DHCP, BOOTP, RARP.
1152  */
1153 
1154 #ifdef IPCONFIG_DYNAMIC
1155 
1156 static int __init ic_dynamic(void)
1157 {
1158         int retries;
1159         struct ic_device *d;
1160         unsigned long start_jiffies, timeout, jiff;
1161         int do_bootp = ic_proto_have_if & IC_BOOTP;
1162         int do_rarp = ic_proto_have_if & IC_RARP;
1163 
1164         /*
1165          * If none of DHCP/BOOTP/RARP was selected, return with an error.
1166          * This routine gets only called when some pieces of information
1167          * are missing, and without DHCP/BOOTP/RARP we are unable to get it.
1168          */
1169         if (!ic_proto_enabled) {
1170                 pr_err("IP-Config: Incomplete network configuration information\n");
1171                 return -1;
1172         }
1173 
1174 #ifdef IPCONFIG_BOOTP
1175         if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
1176                 pr_err("DHCP/BOOTP: No suitable device found\n");
1177 #endif
1178 #ifdef IPCONFIG_RARP
1179         if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)
1180                 pr_err("RARP: No suitable device found\n");
1181 #endif
1182 
1183         if (!ic_proto_have_if)
1184                 /* Error message already printed */
1185                 return -1;
1186 
1187         /*
1188          * Setup protocols
1189          */
1190 #ifdef IPCONFIG_BOOTP
1191         if (do_bootp)
1192                 ic_bootp_init();
1193 #endif
1194 #ifdef IPCONFIG_RARP
1195         if (do_rarp)
1196                 ic_rarp_init();
1197 #endif
1198 
1199         /*
1200          * Send requests and wait, until we get an answer. This loop
1201          * seems to be a terrible waste of CPU time, but actually there is
1202          * only one process running at all, so we don't need to use any
1203          * scheduler functions.
1204          * [Actually we could now, but the nothing else running note still
1205          *  applies.. - AC]
1206          */
1207         pr_notice("Sending %s%s%s requests .",
1208                   do_bootp
1209                   ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "",
1210                   (do_bootp && do_rarp) ? " and " : "",
1211                   do_rarp ? "RARP" : "");
1212 
1213         start_jiffies = jiffies;
1214         d = ic_first_dev;
1215         retries = CONF_SEND_RETRIES;
1216         get_random_bytes(&timeout, sizeof(timeout));
1217         timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned int) CONF_TIMEOUT_RANDOM);
1218         for (;;) {
1219 #ifdef IPCONFIG_BOOTP
1220                 if (do_bootp && (d->able & IC_BOOTP))
1221                         ic_bootp_send_if(d, jiffies - start_jiffies);
1222 #endif
1223 #ifdef IPCONFIG_RARP
1224                 if (do_rarp && (d->able & IC_RARP))
1225                         ic_rarp_send_if(d);
1226 #endif
1227 
1228                 if (!d->next) {
1229                         jiff = jiffies + timeout;
1230                         while (time_before(jiffies, jiff) && !ic_got_reply)
1231                                 schedule_timeout_uninterruptible(1);
1232                 }
1233 #ifdef IPCONFIG_DHCP
1234                 /* DHCP isn't done until we get a DHCPACK. */
1235                 if ((ic_got_reply & IC_BOOTP) &&
1236                     (ic_proto_enabled & IC_USE_DHCP) &&
1237                     ic_dhcp_msgtype != DHCPACK) {
1238                         ic_got_reply = 0;
1239                         /* continue on device that got the reply */
1240                         d = ic_dev;
1241                         pr_cont(",");
1242                         continue;
1243                 }
1244 #endif /* IPCONFIG_DHCP */
1245 
1246                 if (ic_got_reply) {
1247                         pr_cont(" OK\n");
1248                         break;
1249                 }
1250 
1251                 if ((d = d->next))
1252                         continue;
1253 
1254                 if (! --retries) {
1255                         pr_cont(" timed out!\n");
1256                         break;
1257                 }
1258 
1259                 d = ic_first_dev;
1260 
1261                 timeout = timeout CONF_TIMEOUT_MULT;
1262                 if (timeout > CONF_TIMEOUT_MAX)
1263                         timeout = CONF_TIMEOUT_MAX;
1264 
1265                 pr_cont(".");
1266         }
1267 
1268 #ifdef IPCONFIG_BOOTP
1269         if (do_bootp)
1270                 ic_bootp_cleanup();
1271 #endif
1272 #ifdef IPCONFIG_RARP
1273         if (do_rarp)
1274                 ic_rarp_cleanup();
1275 #endif
1276 
1277         if (!ic_got_reply) {
1278                 ic_myaddr = NONE;
1279                 return -1;
1280         }
1281 
1282         pr_info("IP-Config: Got %s answer from %pI4, my address is %pI4\n",
1283                 ((ic_got_reply & IC_RARP) ? "RARP"
1284                 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),
1285                 &ic_addrservaddr, &ic_myaddr);
1286 
1287         return 0;
1288 }
1289 
1290 #endif /* IPCONFIG_DYNAMIC */
1291 
1292 #ifdef CONFIG_PROC_FS
1293 
1294 static int pnp_seq_show(struct seq_file *seq, void *v)
1295 {
1296         int i;
1297 
1298         if (ic_proto_used & IC_PROTO)
1299                 seq_printf(seq, "#PROTO: %s\n",
1300                            (ic_proto_used & IC_RARP) ? "RARP"
1301                            : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP");
1302         else
1303                 seq_puts(seq, "#MANUAL\n");
1304 
1305         if (ic_domain[0])
1306                 seq_printf(seq,
1307                            "domain %s\n", ic_domain);
1308         for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {
1309                 if (ic_nameservers[i] != NONE)
1310                         seq_printf(seq, "nameserver %pI4\n",
1311                                    &ic_nameservers[i]);
1312         }
1313         if (ic_servaddr != NONE)
1314                 seq_printf(seq, "bootserver %pI4\n",
1315                            &ic_servaddr);
1316         return 0;
1317 }
1318 
1319 static int pnp_seq_open(struct inode *indoe, struct file *file)
1320 {
1321         return single_open(file, pnp_seq_show, NULL);
1322 }
1323 
1324 static const struct file_operations pnp_seq_fops = {
1325         .owner          = THIS_MODULE,
1326         .open           = pnp_seq_open,
1327         .read           = seq_read,
1328         .llseek         = seq_lseek,
1329         .release        = single_release,
1330 };
1331 #endif /* CONFIG_PROC_FS */
1332 
1333 /*
1334  *  Extract IP address from the parameter string if needed. Note that we
1335  *  need to have root_server_addr set _before_ IPConfig gets called as it
1336  *  can override it.
1337  */
1338 __be32 __init root_nfs_parse_addr(char *name)
1339 {
1340         __be32 addr;
1341         int octets = 0;
1342         char *cp, *cq;
1343 
1344         cp = cq = name;
1345         while (octets < 4) {
1346                 while (*cp >= '' && *cp <= '9')
1347                         cp++;
1348                 if (cp == cq || cp - cq > 3)
1349                         break;
1350                 if (*cp == '.' || octets == 3)
1351                         octets++;
1352                 if (octets < 4)
1353                         cp++;
1354                 cq = cp;
1355         }
1356         if (octets == 4 && (*cp == ':' || *cp == '\0')) {
1357                 if (*cp == ':')
1358                         *cp++ = '\0';
1359                 addr = in_aton(name);
1360                 memmove(name, cp, strlen(cp) + 1);
1361         } else
1362                 addr = NONE;
1363 
1364         return addr;
1365 }
1366 
1367 #define DEVICE_WAIT_MAX         12 /* 12 seconds */
1368 
1369 static int __init wait_for_devices(void)
1370 {
1371         int i;
1372 
1373         for (i = 0; i < DEVICE_WAIT_MAX; i++) {
1374                 struct net_device *dev;
1375                 int found = 0;
1376 
1377                 rtnl_lock();
1378                 for_each_netdev(&init_net, dev) {
1379                         if (ic_is_init_dev(dev)) {
1380                                 found = 1;
1381                                 break;
1382                         }
1383                 }
1384                 rtnl_unlock();
1385                 if (found)
1386                         return 0;
1387                 ssleep(1);
1388         }
1389         return -ENODEV;
1390 }
1391 
1392 /*
1393  *      IP Autoconfig dispatcher.
1394  */
1395 
1396 static int __init ip_auto_config(void)
1397 {
1398         __be32 addr;
1399 #ifdef IPCONFIG_DYNAMIC
1400         int retries = CONF_OPEN_RETRIES;
1401 #endif
1402         int err;
1403         unsigned int i;
1404 
1405 #ifdef CONFIG_PROC_FS
1406         proc_create("pnp", S_IRUGO, init_net.proc_net, &pnp_seq_fops);
1407 #endif /* CONFIG_PROC_FS */
1408 
1409         if (!ic_enable)
1410                 return 0;
1411 
1412         pr_debug("IP-Config: Entered.\n");
1413 #ifdef IPCONFIG_DYNAMIC
1414  try_try_again:
1415 #endif
1416         /* Wait for devices to appear */
1417         err = wait_for_devices();
1418         if (err)
1419                 return err;
1420 
1421         /* Setup all network devices */
1422         err = ic_open_devs();
1423         if (err)
1424                 return err;
1425 
1426         /* Give drivers a chance to settle */
1427         msleep(CONF_POST_OPEN);
1428 
1429         /*
1430          * If the config information is insufficient (e.g., our IP address or
1431          * IP address of the boot server is missing or we have multiple network
1432          * interfaces and no default was set), use BOOTP or RARP to get the
1433          * missing values.
1434          */
1435         if (ic_myaddr == NONE ||
1436 #ifdef CONFIG_ROOT_NFS
1437             (root_server_addr == NONE &&
1438              ic_servaddr == NONE &&
1439              ROOT_DEV == Root_NFS) ||
1440 #endif
1441             ic_first_dev->next) {
1442 #ifdef IPCONFIG_DYNAMIC
1443                 if (ic_dynamic() < 0) {
1444                         ic_close_devs();
1445 
1446                         /*
1447                          * I don't know why, but sometimes the
1448                          * eepro100 driver (at least) gets upset and
1449                          * doesn't work the first time it's opened.
1450                          * But then if you close it and reopen it, it
1451                          * works just fine.  So we need to try that at
1452                          * least once before giving up.
1453                          *
1454                          * Also, if the root will be NFS-mounted, we
1455                          * have nowhere to go if DHCP fails.  So we
1456                          * just have to keep trying forever.
1457                          *
1458                          *                              -- Chip
1459                          */
1460 #ifdef CONFIG_ROOT_NFS
1461                         if (ROOT_DEV ==  Root_NFS) {
1462                                 pr_err("IP-Config: Retrying forever (NFS root)...\n");
1463                                 goto try_try_again;
1464                         }
1465 #endif
1466 
1467                         if (--retries) {
1468                                 pr_err("IP-Config: Reopening network devices...\n");
1469                                 goto try_try_again;
1470                         }
1471 
1472                         /* Oh, well.  At least we tried. */
1473                         pr_err("IP-Config: Auto-configuration of network failed\n");
1474                         return -1;
1475                 }
1476 #else /* !DYNAMIC */
1477                 pr_err("IP-Config: Incomplete network configuration information\n");
1478                 ic_close_devs();
1479                 return -1;
1480 #endif /* IPCONFIG_DYNAMIC */
1481         } else {
1482                 /* Device selected manually or only one device -> use it */
1483                 ic_dev = ic_first_dev;
1484         }
1485 
1486         addr = root_nfs_parse_addr(root_server_path);
1487         if (root_server_addr == NONE)
1488                 root_server_addr = addr;
1489 
1490         /*
1491          * Use defaults wherever applicable.
1492          */
1493         if (ic_defaults() < 0)
1494                 return -1;
1495 
1496         /*
1497          * Record which protocol was actually used.
1498          */
1499 #ifdef IPCONFIG_DYNAMIC
1500         ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP);
1501 #endif
1502 
1503 #ifndef IPCONFIG_SILENT
1504         /*
1505          * Clue in the operator.
1506          */
1507         pr_info("IP-Config: Complete:\n");
1508 
1509         pr_info("     device=%s, hwaddr=%*phC, ipaddr=%pI4, mask=%pI4, gw=%pI4\n",
1510                 ic_dev->dev->name, ic_dev->dev->addr_len, ic_dev->dev->dev_addr,
1511                 &ic_myaddr, &ic_netmask, &ic_gateway);
1512         pr_info("     host=%s, domain=%s, nis-domain=%s\n",
1513                 utsname()->nodename, ic_domain, utsname()->domainname);
1514         pr_info("     bootserver=%pI4, rootserver=%pI4, rootpath=%s",
1515                 &ic_servaddr, &root_server_addr, root_server_path);
1516         if (ic_dev_mtu)
1517                 pr_cont(", mtu=%d", ic_dev_mtu);
1518         for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
1519                 if (ic_nameservers[i] != NONE) {
1520                         pr_cont("     nameserver%u=%pI4",
1521                                 i, &ic_nameservers[i]);
1522                         break;
1523                 }
1524         for (i++; i < CONF_NAMESERVERS_MAX; i++)
1525                 if (ic_nameservers[i] != NONE)
1526                         pr_cont(", nameserver%u=%pI4", i, &ic_nameservers[i]);
1527         pr_cont("\n");
1528 #endif /* !SILENT */
1529 
1530         /*
1531          * Close all network devices except the device we've
1532          * autoconfigured and set up routes.
1533          */
1534         if (ic_setup_if() < 0 || ic_setup_routes() < 0)
1535                 err = -1;
1536         else
1537                 err = 0;
1538 
1539         ic_close_devs();
1540 
1541         return err;
1542 }
1543 
1544 late_initcall(ip_auto_config);
1545 
1546 
1547 /*
1548  *  Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
1549  *  command line parameter.  See Documentation/filesystems/nfs/nfsroot.txt.
1550  */
1551 static int __init ic_proto_name(char *name)
1552 {
1553         if (!strcmp(name, "on") || !strcmp(name, "any")) {
1554                 return 1;
1555         }
1556         if (!strcmp(name, "off") || !strcmp(name, "none")) {
1557                 return 0;
1558         }
1559 #ifdef CONFIG_IP_PNP_DHCP
1560         else if (!strncmp(name, "dhcp", 4)) {
1561                 char *client_id;
1562 
1563                 ic_proto_enabled &= ~IC_RARP;
1564                 client_id = strstr(name, "dhcp,");
1565                 if (client_id) {
1566                         char *v;
1567 
1568                         client_id = client_id + 5;
1569                         v = strchr(client_id, ',');
1570                         if (!v)
1571                                 return 1;
1572                         *v = 0;
1573                         if (kstrtou8(client_id, 0, dhcp_client_identifier))
1574                                 pr_debug("DHCP: Invalid client identifier type\n");
1575                         strncpy(dhcp_client_identifier + 1, v + 1, 251);
1576                         *v = ',';
1577                 }
1578                 return 1;
1579         }
1580 #endif
1581 #ifdef CONFIG_IP_PNP_BOOTP
1582         else if (!strcmp(name, "bootp")) {
1583                 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP);
1584                 return 1;
1585         }
1586 #endif
1587 #ifdef CONFIG_IP_PNP_RARP
1588         else if (!strcmp(name, "rarp")) {
1589                 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP);
1590                 return 1;
1591         }
1592 #endif
1593 #ifdef IPCONFIG_DYNAMIC
1594         else if (!strcmp(name, "both")) {
1595                 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */
1596                 return 1;
1597         }
1598 #endif
1599         return 0;
1600 }
1601 
1602 static int __init ip_auto_config_setup(char *addrs)
1603 {
1604         char *cp, *ip, *dp;
1605         int num = 0;
1606 
1607         ic_set_manually = 1;
1608         ic_enable = 1;
1609 
1610         /*
1611          * If any dhcp, bootp etc options are set, leave autoconfig on
1612          * and skip the below static IP processing.
1613          */
1614         if (ic_proto_name(addrs))
1615                 return 1;
1616 
1617         /* If no static IP is given, turn off autoconfig and bail.  */
1618         if (*addrs == 0 ||
1619             strcmp(addrs, "off") == 0 ||
1620             strcmp(addrs, "none") == 0) {
1621                 ic_enable = 0;
1622                 return 1;
1623         }
1624 
1625         ic_nameservers_predef();
1626 
1627         /* Parse string for static IP assignment.  */
1628         ip = addrs;
1629         while (ip && *ip) {
1630                 if ((cp = strchr(ip, ':')))
1631                         *cp++ = '\0';
1632                 if (strlen(ip) > 0) {
1633                         pr_debug("IP-Config: Parameter #%d: `%s'\n", num, ip);
1634                         switch (num) {
1635                         case 0:
1636                                 if ((ic_myaddr = in_aton(ip)) == ANY)
1637                                         ic_myaddr = NONE;
1638                                 break;
1639                         case 1:
1640                                 if ((ic_servaddr = in_aton(ip)) == ANY)
1641                                         ic_servaddr = NONE;
1642                                 break;
1643                         case 2:
1644                                 if ((ic_gateway = in_aton(ip)) == ANY)
1645                                         ic_gateway = NONE;
1646                                 break;
1647                         case 3:
1648                                 if ((ic_netmask = in_aton(ip)) == ANY)
1649                                         ic_netmask = NONE;
1650                                 break;
1651                         case 4:
1652                                 if ((dp = strchr(ip, '.'))) {
1653                                         *dp++ = '\0';
1654                                         strlcpy(utsname()->domainname, dp,
1655                                                 sizeof(utsname()->domainname));
1656                                 }
1657                                 strlcpy(utsname()->nodename, ip,
1658                                         sizeof(utsname()->nodename));
1659                                 ic_host_name_set = 1;
1660                                 break;
1661                         case 5:
1662                                 strlcpy(user_dev_name, ip, sizeof(user_dev_name));
1663                                 break;
1664                         case 6:
1665                                 if (ic_proto_name(ip) == 0 &&
1666                                     ic_myaddr == NONE) {
1667                                         ic_enable = 0;
1668                                 }
1669                                 break;
1670                         case 7:
1671                                 if (CONF_NAMESERVERS_MAX >= 1) {
1672                                         ic_nameservers[0] = in_aton(ip);
1673                                         if (ic_nameservers[0] == ANY)
1674                                                 ic_nameservers[0] = NONE;
1675                                 }
1676                                 break;
1677                         case 8:
1678                                 if (CONF_NAMESERVERS_MAX >= 2) {
1679                                         ic_nameservers[1] = in_aton(ip);
1680                                         if (ic_nameservers[1] == ANY)
1681                                                 ic_nameservers[1] = NONE;
1682                                 }
1683                                 break;
1684                         }
1685                 }
1686                 ip = cp;
1687                 num++;
1688         }
1689 
1690         return 1;
1691 }
1692 __setup("ip=", ip_auto_config_setup);
1693 
1694 static int __init nfsaddrs_config_setup(char *addrs)
1695 {
1696         return ip_auto_config_setup(addrs);
1697 }
1698 __setup("nfsaddrs=", nfsaddrs_config_setup);
1699 
1700 static int __init vendor_class_identifier_setup(char *addrs)
1701 {
1702         if (strlcpy(vendor_class_identifier, addrs,
1703                     sizeof(vendor_class_identifier))
1704             >= sizeof(vendor_class_identifier))
1705                 pr_warn("DHCP: vendorclass too long, truncated to \"%s\"\n",
1706                         vendor_class_identifier);
1707         return 1;
1708 }
1709 __setup("dhcpclass=", vendor_class_identifier_setup);
1710 

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