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

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