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[mirror_ubuntu-bionic-kernel.git] / net / ipv4 / ipconfig.c
1 /*
2 * Automatic Configuration of IP -- use DHCP, BOOTP, RARP, or
3 * user-supplied information to configure own IP address and routes.
4 *
5 * Copyright (C) 1996-1998 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
6 *
7 * Derived from network configuration code in fs/nfs/nfsroot.c,
8 * originally Copyright (C) 1995, 1996 Gero Kuhlmann and me.
9 *
10 * BOOTP rewritten to construct and analyse packets itself instead
11 * of misusing the IP layer. num_bugs_causing_wrong_arp_replies--;
12 * -- MJ, December 1998
13 *
14 * Fixed ip_auto_config_setup calling at startup in the new "Linker Magic"
15 * initialization scheme.
16 * - Arnaldo Carvalho de Melo <acme@conectiva.com.br>, 08/11/1999
17 *
18 * DHCP support added. To users this looks like a whole separate
19 * protocol, but we know it's just a bag on the side of BOOTP.
20 * -- Chip Salzenberg <chip@valinux.com>, May 2000
21 *
22 * Ported DHCP support from 2.2.16 to 2.4.0-test4
23 * -- Eric Biederman <ebiederman@lnxi.com>, 30 Aug 2000
24 *
25 * Merged changes from 2.2.19 into 2.4.3
26 * -- Eric Biederman <ebiederman@lnxi.com>, 22 April Aug 2001
27 *
28 * Multiple Nameservers in /proc/net/pnp
29 * -- Josef Siemes <jsiemes@web.de>, Aug 2002
30 */
31
32 #include <linux/types.h>
33 #include <linux/string.h>
34 #include <linux/kernel.h>
35 #include <linux/jiffies.h>
36 #include <linux/random.h>
37 #include <linux/init.h>
38 #include <linux/utsname.h>
39 #include <linux/in.h>
40 #include <linux/if.h>
41 #include <linux/inet.h>
42 #include <linux/inetdevice.h>
43 #include <linux/netdevice.h>
44 #include <linux/if_arp.h>
45 #include <linux/skbuff.h>
46 #include <linux/ip.h>
47 #include <linux/socket.h>
48 #include <linux/route.h>
49 #include <linux/udp.h>
50 #include <linux/proc_fs.h>
51 #include <linux/seq_file.h>
52 #include <linux/major.h>
53 #include <linux/root_dev.h>
54 #include <linux/delay.h>
55 #include <linux/nfs_fs.h>
56 #include <linux/slab.h>
57 #include <linux/export.h>
58 #include <net/net_namespace.h>
59 #include <net/arp.h>
60 #include <net/ip.h>
61 #include <net/ipconfig.h>
62 #include <net/route.h>
63
64 #include <asm/uaccess.h>
65 #include <net/checksum.h>
66 #include <asm/processor.h>
67
68 /* Define this to allow debugging output */
69 #undef IPCONFIG_DEBUG
70
71 #ifdef IPCONFIG_DEBUG
72 #define DBG(x) printk x
73 #else
74 #define DBG(x) do { } while(0)
75 #endif
76
77 #if defined(CONFIG_IP_PNP_DHCP)
78 #define IPCONFIG_DHCP
79 #endif
80 #if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_DHCP)
81 #define IPCONFIG_BOOTP
82 #endif
83 #if defined(CONFIG_IP_PNP_RARP)
84 #define IPCONFIG_RARP
85 #endif
86 #if defined(IPCONFIG_BOOTP) || defined(IPCONFIG_RARP)
87 #define IPCONFIG_DYNAMIC
88 #endif
89
90 /* Define the friendly delay before and after opening net devices */
91 #define CONF_POST_OPEN 10 /* After opening: 10 msecs */
92 #define CONF_CARRIER_TIMEOUT 120000 /* Wait for carrier timeout */
93
94 /* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */
95 #define CONF_OPEN_RETRIES 2 /* (Re)open devices twice */
96 #define CONF_SEND_RETRIES 6 /* Send six requests per open */
97 #define CONF_INTER_TIMEOUT (HZ/2) /* Inter-device timeout: 1/2 second */
98 #define CONF_BASE_TIMEOUT (HZ*2) /* Initial timeout: 2 seconds */
99 #define CONF_TIMEOUT_RANDOM (HZ) /* Maximum amount of randomization */
100 #define CONF_TIMEOUT_MULT *7/4 /* Rate of timeout growth */
101 #define CONF_TIMEOUT_MAX (HZ*30) /* Maximum allowed timeout */
102 #define CONF_NAMESERVERS_MAX 3 /* Maximum number of nameservers
103 - '3' from resolv.h */
104
105 #define NONE cpu_to_be32(INADDR_NONE)
106 #define ANY cpu_to_be32(INADDR_ANY)
107
108 /*
109 * Public IP configuration
110 */
111
112 /* This is used by platforms which might be able to set the ipconfig
113 * variables using firmware environment vars. If this is set, it will
114 * ignore such firmware variables.
115 */
116 int ic_set_manually __initdata = 0; /* IPconfig parameters set manually */
117
118 static int ic_enable __initdata = 0; /* IP config enabled? */
119
120 /* Protocol choice */
121 int ic_proto_enabled __initdata = 0
122 #ifdef IPCONFIG_BOOTP
123 | IC_BOOTP
124 #endif
125 #ifdef CONFIG_IP_PNP_DHCP
126 | IC_USE_DHCP
127 #endif
128 #ifdef IPCONFIG_RARP
129 | IC_RARP
130 #endif
131 ;
132
133 static int ic_host_name_set __initdata = 0; /* Host name set by us? */
134
135 __be32 ic_myaddr = NONE; /* My IP address */
136 static __be32 ic_netmask = NONE; /* Netmask for local subnet */
137 __be32 ic_gateway = NONE; /* Gateway IP address */
138
139 __be32 ic_servaddr = NONE; /* Boot server IP address */
140
141 __be32 root_server_addr = NONE; /* Address of NFS server */
142 u8 root_server_path[256] = { 0, }; /* Path to mount as root */
143
144 u32 ic_dev_xid; /* Device under configuration */
145
146 /* vendor class identifier */
147 static char vendor_class_identifier[253] __initdata;
148
149 /* Persistent data: */
150
151 static int ic_proto_used; /* Protocol used, if any */
152 static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */
153 static u8 ic_domain[64]; /* DNS (not NIS) domain name */
154
155 /*
156 * Private state.
157 */
158
159 /* Name of user-selected boot device */
160 static char user_dev_name[IFNAMSIZ] __initdata = { 0, };
161
162 /* Protocols supported by available interfaces */
163 static int ic_proto_have_if __initdata = 0;
164
165 /* MTU for boot device */
166 static int ic_dev_mtu __initdata = 0;
167
168 #ifdef IPCONFIG_DYNAMIC
169 static DEFINE_SPINLOCK(ic_recv_lock);
170 static volatile int ic_got_reply __initdata = 0; /* Proto(s) that replied */
171 #endif
172 #ifdef IPCONFIG_DHCP
173 static int ic_dhcp_msgtype __initdata = 0; /* DHCP msg type received */
174 #endif
175
176
177 /*
178 * Network devices
179 */
180
181 struct ic_device {
182 struct ic_device *next;
183 struct net_device *dev;
184 unsigned short flags;
185 short able;
186 __be32 xid;
187 };
188
189 static struct ic_device *ic_first_dev __initdata = NULL;/* List of open device */
190 static struct net_device *ic_dev __initdata = NULL; /* Selected device */
191
192 static bool __init ic_is_init_dev(struct net_device *dev)
193 {
194 if (dev->flags & IFF_LOOPBACK)
195 return false;
196 return user_dev_name[0] ? !strcmp(dev->name, user_dev_name) :
197 (!(dev->flags & IFF_LOOPBACK) &&
198 (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) &&
199 strncmp(dev->name, "dummy", 5));
200 }
201
202 static int __init ic_open_devs(void)
203 {
204 struct ic_device *d, **last;
205 struct net_device *dev;
206 unsigned short oflags;
207 unsigned long start;
208
209 last = &ic_first_dev;
210 rtnl_lock();
211
212 /* bring loopback device up first */
213 for_each_netdev(&init_net, dev) {
214 if (!(dev->flags & IFF_LOOPBACK))
215 continue;
216 if (dev_change_flags(dev, dev->flags | IFF_UP) < 0)
217 printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name);
218 }
219
220 for_each_netdev(&init_net, dev) {
221 if (ic_is_init_dev(dev)) {
222 int able = 0;
223 if (dev->mtu >= 364)
224 able |= IC_BOOTP;
225 else
226 printk(KERN_WARNING "DHCP/BOOTP: Ignoring device %s, MTU %d too small", dev->name, dev->mtu);
227 if (!(dev->flags & IFF_NOARP))
228 able |= IC_RARP;
229 able &= ic_proto_enabled;
230 if (ic_proto_enabled && !able)
231 continue;
232 oflags = dev->flags;
233 if (dev_change_flags(dev, oflags | IFF_UP) < 0) {
234 printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name);
235 continue;
236 }
237 if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) {
238 rtnl_unlock();
239 return -ENOMEM;
240 }
241 d->dev = dev;
242 *last = d;
243 last = &d->next;
244 d->flags = oflags;
245 d->able = able;
246 if (able & IC_BOOTP)
247 get_random_bytes(&d->xid, sizeof(__be32));
248 else
249 d->xid = 0;
250 ic_proto_have_if |= able;
251 DBG(("IP-Config: %s UP (able=%d, xid=%08x)\n",
252 dev->name, able, d->xid));
253 }
254 }
255
256 /* wait for a carrier on at least one device */
257 start = jiffies;
258 while (jiffies - start < msecs_to_jiffies(CONF_CARRIER_TIMEOUT)) {
259 for_each_netdev(&init_net, dev)
260 if (ic_is_init_dev(dev) && netif_carrier_ok(dev))
261 goto have_carrier;
262
263 msleep(1);
264 }
265 have_carrier:
266 rtnl_unlock();
267
268 *last = NULL;
269
270 if (!ic_first_dev) {
271 if (user_dev_name[0])
272 printk(KERN_ERR "IP-Config: Device `%s' not found.\n", user_dev_name);
273 else
274 printk(KERN_ERR "IP-Config: No network devices available.\n");
275 return -ENODEV;
276 }
277 return 0;
278 }
279
280 static void __init ic_close_devs(void)
281 {
282 struct ic_device *d, *next;
283 struct net_device *dev;
284
285 rtnl_lock();
286 next = ic_first_dev;
287 while ((d = next)) {
288 next = d->next;
289 dev = d->dev;
290 if (dev != ic_dev) {
291 DBG(("IP-Config: Downing %s\n", dev->name));
292 dev_change_flags(dev, d->flags);
293 }
294 kfree(d);
295 }
296 rtnl_unlock();
297 }
298
299 /*
300 * Interface to various network functions.
301 */
302
303 static inline void
304 set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port)
305 {
306 sin->sin_family = AF_INET;
307 sin->sin_addr.s_addr = addr;
308 sin->sin_port = port;
309 }
310
311 static int __init ic_devinet_ioctl(unsigned int cmd, struct ifreq *arg)
312 {
313 int res;
314
315 mm_segment_t oldfs = get_fs();
316 set_fs(get_ds());
317 res = devinet_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
318 set_fs(oldfs);
319 return res;
320 }
321
322 static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg)
323 {
324 int res;
325
326 mm_segment_t oldfs = get_fs();
327 set_fs(get_ds());
328 res = dev_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
329 set_fs(oldfs);
330 return res;
331 }
332
333 static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg)
334 {
335 int res;
336
337 mm_segment_t oldfs = get_fs();
338 set_fs(get_ds());
339 res = ip_rt_ioctl(&init_net, cmd, (void __user *) arg);
340 set_fs(oldfs);
341 return res;
342 }
343
344 /*
345 * Set up interface addresses and routes.
346 */
347
348 static int __init ic_setup_if(void)
349 {
350 struct ifreq ir;
351 struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr;
352 int err;
353
354 memset(&ir, 0, sizeof(ir));
355 strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name);
356 set_sockaddr(sin, ic_myaddr, 0);
357 if ((err = ic_devinet_ioctl(SIOCSIFADDR, &ir)) < 0) {
358 printk(KERN_ERR "IP-Config: Unable to set interface address (%d).\n", err);
359 return -1;
360 }
361 set_sockaddr(sin, ic_netmask, 0);
362 if ((err = ic_devinet_ioctl(SIOCSIFNETMASK, &ir)) < 0) {
363 printk(KERN_ERR "IP-Config: Unable to set interface netmask (%d).\n", err);
364 return -1;
365 }
366 set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0);
367 if ((err = ic_devinet_ioctl(SIOCSIFBRDADDR, &ir)) < 0) {
368 printk(KERN_ERR "IP-Config: Unable to set interface broadcast address (%d).\n", err);
369 return -1;
370 }
371 /* Handle the case where we need non-standard MTU on the boot link (a network
372 * using jumbo frames, for instance). If we can't set the mtu, don't error
373 * out, we'll try to muddle along.
374 */
375 if (ic_dev_mtu != 0) {
376 strcpy(ir.ifr_name, ic_dev->name);
377 ir.ifr_mtu = ic_dev_mtu;
378 if ((err = ic_dev_ioctl(SIOCSIFMTU, &ir)) < 0)
379 printk(KERN_ERR "IP-Config: Unable to set interface mtu to %d (%d).\n",
380 ic_dev_mtu, err);
381 }
382 return 0;
383 }
384
385 static int __init ic_setup_routes(void)
386 {
387 /* No need to setup device routes, only the default route... */
388
389 if (ic_gateway != NONE) {
390 struct rtentry rm;
391 int err;
392
393 memset(&rm, 0, sizeof(rm));
394 if ((ic_gateway ^ ic_myaddr) & ic_netmask) {
395 printk(KERN_ERR "IP-Config: Gateway not on directly connected network.\n");
396 return -1;
397 }
398 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0);
399 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0);
400 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0);
401 rm.rt_flags = RTF_UP | RTF_GATEWAY;
402 if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) {
403 printk(KERN_ERR "IP-Config: Cannot add default route (%d).\n", err);
404 return -1;
405 }
406 }
407
408 return 0;
409 }
410
411 /*
412 * Fill in default values for all missing parameters.
413 */
414
415 static int __init ic_defaults(void)
416 {
417 /*
418 * At this point we have no userspace running so need not
419 * claim locks on system_utsname
420 */
421
422 if (!ic_host_name_set)
423 sprintf(init_utsname()->nodename, "%pI4", &ic_myaddr);
424
425 if (root_server_addr == NONE)
426 root_server_addr = ic_servaddr;
427
428 if (ic_netmask == NONE) {
429 if (IN_CLASSA(ntohl(ic_myaddr)))
430 ic_netmask = htonl(IN_CLASSA_NET);
431 else if (IN_CLASSB(ntohl(ic_myaddr)))
432 ic_netmask = htonl(IN_CLASSB_NET);
433 else if (IN_CLASSC(ntohl(ic_myaddr)))
434 ic_netmask = htonl(IN_CLASSC_NET);
435 else {
436 printk(KERN_ERR "IP-Config: Unable to guess netmask for address %pI4\n",
437 &ic_myaddr);
438 return -1;
439 }
440 printk("IP-Config: Guessing netmask %pI4\n", &ic_netmask);
441 }
442
443 return 0;
444 }
445
446 /*
447 * RARP support.
448 */
449
450 #ifdef IPCONFIG_RARP
451
452 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
453
454 static struct packet_type rarp_packet_type __initdata = {
455 .type = cpu_to_be16(ETH_P_RARP),
456 .func = ic_rarp_recv,
457 };
458
459 static inline void __init ic_rarp_init(void)
460 {
461 dev_add_pack(&rarp_packet_type);
462 }
463
464 static inline void __init ic_rarp_cleanup(void)
465 {
466 dev_remove_pack(&rarp_packet_type);
467 }
468
469 /*
470 * Process received RARP packet.
471 */
472 static int __init
473 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
474 {
475 struct arphdr *rarp;
476 unsigned char *rarp_ptr;
477 __be32 sip, tip;
478 unsigned char *sha, *tha; /* s for "source", t for "target" */
479 struct ic_device *d;
480
481 if (!net_eq(dev_net(dev), &init_net))
482 goto drop;
483
484 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
485 return NET_RX_DROP;
486
487 if (!pskb_may_pull(skb, sizeof(struct arphdr)))
488 goto drop;
489
490 /* Basic sanity checks can be done without the lock. */
491 rarp = (struct arphdr *)skb_transport_header(skb);
492
493 /* If this test doesn't pass, it's not IP, or we should
494 * ignore it anyway.
495 */
496 if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd))
497 goto drop;
498
499 /* If it's not a RARP reply, delete it. */
500 if (rarp->ar_op != htons(ARPOP_RREPLY))
501 goto drop;
502
503 /* If it's not Ethernet, delete it. */
504 if (rarp->ar_pro != htons(ETH_P_IP))
505 goto drop;
506
507 if (!pskb_may_pull(skb, arp_hdr_len(dev)))
508 goto drop;
509
510 /* OK, it is all there and looks valid, process... */
511 rarp = (struct arphdr *)skb_transport_header(skb);
512 rarp_ptr = (unsigned char *) (rarp + 1);
513
514 /* One reply at a time, please. */
515 spin_lock(&ic_recv_lock);
516
517 /* If we already have a reply, just drop the packet */
518 if (ic_got_reply)
519 goto drop_unlock;
520
521 /* Find the ic_device that the packet arrived on */
522 d = ic_first_dev;
523 while (d && d->dev != dev)
524 d = d->next;
525 if (!d)
526 goto drop_unlock; /* should never happen */
527
528 /* Extract variable-width fields */
529 sha = rarp_ptr;
530 rarp_ptr += dev->addr_len;
531 memcpy(&sip, rarp_ptr, 4);
532 rarp_ptr += 4;
533 tha = rarp_ptr;
534 rarp_ptr += dev->addr_len;
535 memcpy(&tip, rarp_ptr, 4);
536
537 /* Discard packets which are not meant for us. */
538 if (memcmp(tha, dev->dev_addr, dev->addr_len))
539 goto drop_unlock;
540
541 /* Discard packets which are not from specified server. */
542 if (ic_servaddr != NONE && ic_servaddr != sip)
543 goto drop_unlock;
544
545 /* We have a winner! */
546 ic_dev = dev;
547 if (ic_myaddr == NONE)
548 ic_myaddr = tip;
549 ic_servaddr = sip;
550 ic_got_reply = IC_RARP;
551
552 drop_unlock:
553 /* Show's over. Nothing to see here. */
554 spin_unlock(&ic_recv_lock);
555
556 drop:
557 /* Throw the packet out. */
558 kfree_skb(skb);
559 return 0;
560 }
561
562
563 /*
564 * Send RARP request packet over a single interface.
565 */
566 static void __init ic_rarp_send_if(struct ic_device *d)
567 {
568 struct net_device *dev = d->dev;
569 arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL,
570 dev->dev_addr, dev->dev_addr);
571 }
572 #endif
573
574 /*
575 * DHCP/BOOTP support.
576 */
577
578 #ifdef IPCONFIG_BOOTP
579
580 struct bootp_pkt { /* BOOTP packet format */
581 struct iphdr iph; /* IP header */
582 struct udphdr udph; /* UDP header */
583 u8 op; /* 1=request, 2=reply */
584 u8 htype; /* HW address type */
585 u8 hlen; /* HW address length */
586 u8 hops; /* Used only by gateways */
587 __be32 xid; /* Transaction ID */
588 __be16 secs; /* Seconds since we started */
589 __be16 flags; /* Just what it says */
590 __be32 client_ip; /* Client's IP address if known */
591 __be32 your_ip; /* Assigned IP address */
592 __be32 server_ip; /* (Next, e.g. NFS) Server's IP address */
593 __be32 relay_ip; /* IP address of BOOTP relay */
594 u8 hw_addr[16]; /* Client's HW address */
595 u8 serv_name[64]; /* Server host name */
596 u8 boot_file[128]; /* Name of boot file */
597 u8 exten[312]; /* DHCP options / BOOTP vendor extensions */
598 };
599
600 /* packet ops */
601 #define BOOTP_REQUEST 1
602 #define BOOTP_REPLY 2
603
604 /* DHCP message types */
605 #define DHCPDISCOVER 1
606 #define DHCPOFFER 2
607 #define DHCPREQUEST 3
608 #define DHCPDECLINE 4
609 #define DHCPACK 5
610 #define DHCPNAK 6
611 #define DHCPRELEASE 7
612 #define DHCPINFORM 8
613
614 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
615
616 static struct packet_type bootp_packet_type __initdata = {
617 .type = cpu_to_be16(ETH_P_IP),
618 .func = ic_bootp_recv,
619 };
620
621
622 /*
623 * Initialize DHCP/BOOTP extension fields in the request.
624 */
625
626 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 };
627
628 #ifdef IPCONFIG_DHCP
629
630 static void __init
631 ic_dhcp_init_options(u8 *options)
632 {
633 u8 mt = ((ic_servaddr == NONE)
634 ? DHCPDISCOVER : DHCPREQUEST);
635 u8 *e = options;
636 int len;
637
638 #ifdef IPCONFIG_DEBUG
639 printk("DHCP: Sending message type %d\n", mt);
640 #endif
641
642 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */
643 e += 4;
644
645 *e++ = 53; /* DHCP message type */
646 *e++ = 1;
647 *e++ = mt;
648
649 if (mt == DHCPREQUEST) {
650 *e++ = 54; /* Server ID (IP address) */
651 *e++ = 4;
652 memcpy(e, &ic_servaddr, 4);
653 e += 4;
654
655 *e++ = 50; /* Requested IP address */
656 *e++ = 4;
657 memcpy(e, &ic_myaddr, 4);
658 e += 4;
659 }
660
661 /* always? */
662 {
663 static const u8 ic_req_params[] = {
664 1, /* Subnet mask */
665 3, /* Default gateway */
666 6, /* DNS server */
667 12, /* Host name */
668 15, /* Domain name */
669 17, /* Boot path */
670 26, /* MTU */
671 40, /* NIS domain name */
672 };
673
674 *e++ = 55; /* Parameter request list */
675 *e++ = sizeof(ic_req_params);
676 memcpy(e, ic_req_params, sizeof(ic_req_params));
677 e += sizeof(ic_req_params);
678
679 if (ic_host_name_set) {
680 *e++ = 12; /* host-name */
681 len = strlen(utsname()->nodename);
682 *e++ = len;
683 memcpy(e, utsname()->nodename, len);
684 e += len;
685 }
686 if (*vendor_class_identifier) {
687 printk(KERN_INFO "DHCP: sending class identifier \"%s\"\n",
688 vendor_class_identifier);
689 *e++ = 60; /* Class-identifier */
690 len = strlen(vendor_class_identifier);
691 *e++ = len;
692 memcpy(e, vendor_class_identifier, len);
693 e += len;
694 }
695 }
696
697 *e++ = 255; /* End of the list */
698 }
699
700 #endif /* IPCONFIG_DHCP */
701
702 static void __init ic_bootp_init_ext(u8 *e)
703 {
704 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */
705 e += 4;
706 *e++ = 1; /* Subnet mask request */
707 *e++ = 4;
708 e += 4;
709 *e++ = 3; /* Default gateway request */
710 *e++ = 4;
711 e += 4;
712 *e++ = 5; /* Name server request */
713 *e++ = 8;
714 e += 8;
715 *e++ = 12; /* Host name request */
716 *e++ = 32;
717 e += 32;
718 *e++ = 40; /* NIS Domain name request */
719 *e++ = 32;
720 e += 32;
721 *e++ = 17; /* Boot path */
722 *e++ = 40;
723 e += 40;
724
725 *e++ = 57; /* set extension buffer size for reply */
726 *e++ = 2;
727 *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */
728 *e++ = 150;
729
730 *e++ = 255; /* End of the list */
731 }
732
733
734 /*
735 * Initialize the DHCP/BOOTP mechanism.
736 */
737 static inline void __init ic_bootp_init(void)
738 {
739 int i;
740
741 for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
742 ic_nameservers[i] = NONE;
743
744 dev_add_pack(&bootp_packet_type);
745 }
746
747
748 /*
749 * DHCP/BOOTP cleanup.
750 */
751 static inline void __init ic_bootp_cleanup(void)
752 {
753 dev_remove_pack(&bootp_packet_type);
754 }
755
756
757 /*
758 * Send DHCP/BOOTP request to single interface.
759 */
760 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff)
761 {
762 struct net_device *dev = d->dev;
763 struct sk_buff *skb;
764 struct bootp_pkt *b;
765 struct iphdr *h;
766 int hlen = LL_RESERVED_SPACE(dev);
767 int tlen = dev->needed_tailroom;
768
769 /* Allocate packet */
770 skb = alloc_skb(sizeof(struct bootp_pkt) + hlen + tlen + 15,
771 GFP_KERNEL);
772 if (!skb)
773 return;
774 skb_reserve(skb, hlen);
775 b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt));
776 memset(b, 0, sizeof(struct bootp_pkt));
777
778 /* Construct IP header */
779 skb_reset_network_header(skb);
780 h = ip_hdr(skb);
781 h->version = 4;
782 h->ihl = 5;
783 h->tot_len = htons(sizeof(struct bootp_pkt));
784 h->frag_off = htons(IP_DF);
785 h->ttl = 64;
786 h->protocol = IPPROTO_UDP;
787 h->daddr = htonl(INADDR_BROADCAST);
788 h->check = ip_fast_csum((unsigned char *) h, h->ihl);
789
790 /* Construct UDP header */
791 b->udph.source = htons(68);
792 b->udph.dest = htons(67);
793 b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr));
794 /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */
795
796 /* Construct DHCP/BOOTP header */
797 b->op = BOOTP_REQUEST;
798 if (dev->type < 256) /* check for false types */
799 b->htype = dev->type;
800 else if (dev->type == ARPHRD_IEEE802_TR) /* fix for token ring */
801 b->htype = ARPHRD_IEEE802;
802 else if (dev->type == ARPHRD_FDDI)
803 b->htype = ARPHRD_ETHER;
804 else {
805 printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name);
806 b->htype = dev->type; /* can cause undefined behavior */
807 }
808
809 /* server_ip and your_ip address are both already zero per RFC2131 */
810 b->hlen = dev->addr_len;
811 memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
812 b->secs = htons(jiffies_diff / HZ);
813 b->xid = d->xid;
814
815 /* add DHCP options or BOOTP extensions */
816 #ifdef IPCONFIG_DHCP
817 if (ic_proto_enabled & IC_USE_DHCP)
818 ic_dhcp_init_options(b->exten);
819 else
820 #endif
821 ic_bootp_init_ext(b->exten);
822
823 /* Chain packet down the line... */
824 skb->dev = dev;
825 skb->protocol = htons(ETH_P_IP);
826 if (dev_hard_header(skb, dev, ntohs(skb->protocol),
827 dev->broadcast, dev->dev_addr, skb->len) < 0) {
828 kfree_skb(skb);
829 printk("E");
830 return;
831 }
832
833 if (dev_queue_xmit(skb) < 0)
834 printk("E");
835 }
836
837
838 /*
839 * Copy BOOTP-supplied string if not already set.
840 */
841 static int __init ic_bootp_string(char *dest, char *src, int len, int max)
842 {
843 if (!len)
844 return 0;
845 if (len > max-1)
846 len = max-1;
847 memcpy(dest, src, len);
848 dest[len] = '\0';
849 return 1;
850 }
851
852
853 /*
854 * Process BOOTP extensions.
855 */
856 static void __init ic_do_bootp_ext(u8 *ext)
857 {
858 u8 servers;
859 int i;
860 u16 mtu;
861
862 #ifdef IPCONFIG_DEBUG
863 u8 *c;
864
865 printk("DHCP/BOOTP: Got extension %d:",*ext);
866 for (c=ext+2; c<ext+2+ext[1]; c++)
867 printk(" %02x", *c);
868 printk("\n");
869 #endif
870
871 switch (*ext++) {
872 case 1: /* Subnet mask */
873 if (ic_netmask == NONE)
874 memcpy(&ic_netmask, ext+1, 4);
875 break;
876 case 3: /* Default gateway */
877 if (ic_gateway == NONE)
878 memcpy(&ic_gateway, ext+1, 4);
879 break;
880 case 6: /* DNS server */
881 servers= *ext/4;
882 if (servers > CONF_NAMESERVERS_MAX)
883 servers = CONF_NAMESERVERS_MAX;
884 for (i = 0; i < servers; i++) {
885 if (ic_nameservers[i] == NONE)
886 memcpy(&ic_nameservers[i], ext+1+4*i, 4);
887 }
888 break;
889 case 12: /* Host name */
890 ic_bootp_string(utsname()->nodename, ext+1, *ext,
891 __NEW_UTS_LEN);
892 ic_host_name_set = 1;
893 break;
894 case 15: /* Domain name (DNS) */
895 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
896 break;
897 case 17: /* Root path */
898 if (!root_server_path[0])
899 ic_bootp_string(root_server_path, ext+1, *ext,
900 sizeof(root_server_path));
901 break;
902 case 26: /* Interface MTU */
903 memcpy(&mtu, ext+1, sizeof(mtu));
904 ic_dev_mtu = ntohs(mtu);
905 break;
906 case 40: /* NIS Domain name (_not_ DNS) */
907 ic_bootp_string(utsname()->domainname, ext+1, *ext,
908 __NEW_UTS_LEN);
909 break;
910 }
911 }
912
913
914 /*
915 * Receive BOOTP reply.
916 */
917 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
918 {
919 struct bootp_pkt *b;
920 struct iphdr *h;
921 struct ic_device *d;
922 int len, ext_len;
923
924 if (!net_eq(dev_net(dev), &init_net))
925 goto drop;
926
927 /* Perform verifications before taking the lock. */
928 if (skb->pkt_type == PACKET_OTHERHOST)
929 goto drop;
930
931 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
932 return NET_RX_DROP;
933
934 if (!pskb_may_pull(skb,
935 sizeof(struct iphdr) +
936 sizeof(struct udphdr)))
937 goto drop;
938
939 b = (struct bootp_pkt *)skb_network_header(skb);
940 h = &b->iph;
941
942 if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP)
943 goto drop;
944
945 /* Fragments are not supported */
946 if (ip_is_fragment(h)) {
947 if (net_ratelimit())
948 printk(KERN_ERR "DHCP/BOOTP: Ignoring fragmented "
949 "reply.\n");
950 goto drop;
951 }
952
953 if (skb->len < ntohs(h->tot_len))
954 goto drop;
955
956 if (ip_fast_csum((char *) h, h->ihl))
957 goto drop;
958
959 if (b->udph.source != htons(67) || b->udph.dest != htons(68))
960 goto drop;
961
962 if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
963 goto drop;
964
965 len = ntohs(b->udph.len) - sizeof(struct udphdr);
966 ext_len = len - (sizeof(*b) -
967 sizeof(struct iphdr) -
968 sizeof(struct udphdr) -
969 sizeof(b->exten));
970 if (ext_len < 0)
971 goto drop;
972
973 /* Ok the front looks good, make sure we can get at the rest. */
974 if (!pskb_may_pull(skb, skb->len))
975 goto drop;
976
977 b = (struct bootp_pkt *)skb_network_header(skb);
978 h = &b->iph;
979
980 /* One reply at a time, please. */
981 spin_lock(&ic_recv_lock);
982
983 /* If we already have a reply, just drop the packet */
984 if (ic_got_reply)
985 goto drop_unlock;
986
987 /* Find the ic_device that the packet arrived on */
988 d = ic_first_dev;
989 while (d && d->dev != dev)
990 d = d->next;
991 if (!d)
992 goto drop_unlock; /* should never happen */
993
994 /* Is it a reply to our BOOTP request? */
995 if (b->op != BOOTP_REPLY ||
996 b->xid != d->xid) {
997 if (net_ratelimit())
998 printk(KERN_ERR "DHCP/BOOTP: Reply not for us, "
999 "op[%x] xid[%x]\n",
1000 b->op, b->xid);
1001 goto drop_unlock;
1002 }
1003
1004 /* Is it a reply for the device we are configuring? */
1005 if (b->xid != ic_dev_xid) {
1006 if (net_ratelimit())
1007 printk(KERN_ERR "DHCP/BOOTP: Ignoring delayed packet\n");
1008 goto drop_unlock;
1009 }
1010
1011 /* Parse extensions */
1012 if (ext_len >= 4 &&
1013 !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */
1014 u8 *end = (u8 *) b + ntohs(b->iph.tot_len);
1015 u8 *ext;
1016
1017 #ifdef IPCONFIG_DHCP
1018 if (ic_proto_enabled & IC_USE_DHCP) {
1019 __be32 server_id = NONE;
1020 int mt = 0;
1021
1022 ext = &b->exten[4];
1023 while (ext < end && *ext != 0xff) {
1024 u8 *opt = ext++;
1025 if (*opt == 0) /* Padding */
1026 continue;
1027 ext += *ext + 1;
1028 if (ext >= end)
1029 break;
1030 switch (*opt) {
1031 case 53: /* Message type */
1032 if (opt[1])
1033 mt = opt[2];
1034 break;
1035 case 54: /* Server ID (IP address) */
1036 if (opt[1] >= 4)
1037 memcpy(&server_id, opt + 2, 4);
1038 break;
1039 }
1040 }
1041
1042 #ifdef IPCONFIG_DEBUG
1043 printk("DHCP: Got message type %d\n", mt);
1044 #endif
1045
1046 switch (mt) {
1047 case DHCPOFFER:
1048 /* While in the process of accepting one offer,
1049 * ignore all others.
1050 */
1051 if (ic_myaddr != NONE)
1052 goto drop_unlock;
1053
1054 /* Let's accept that offer. */
1055 ic_myaddr = b->your_ip;
1056 ic_servaddr = server_id;
1057 #ifdef IPCONFIG_DEBUG
1058 printk("DHCP: Offered address %pI4 by server %pI4\n",
1059 &ic_myaddr, &ic_servaddr);
1060 #endif
1061 /* The DHCP indicated server address takes
1062 * precedence over the bootp header one if
1063 * they are different.
1064 */
1065 if ((server_id != NONE) &&
1066 (b->server_ip != server_id))
1067 b->server_ip = ic_servaddr;
1068 break;
1069
1070 case DHCPACK:
1071 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0)
1072 goto drop_unlock;
1073
1074 /* Yeah! */
1075 break;
1076
1077 default:
1078 /* Urque. Forget it*/
1079 ic_myaddr = NONE;
1080 ic_servaddr = NONE;
1081 goto drop_unlock;
1082 }
1083
1084 ic_dhcp_msgtype = mt;
1085
1086 }
1087 #endif /* IPCONFIG_DHCP */
1088
1089 ext = &b->exten[4];
1090 while (ext < end && *ext != 0xff) {
1091 u8 *opt = ext++;
1092 if (*opt == 0) /* Padding */
1093 continue;
1094 ext += *ext + 1;
1095 if (ext < end)
1096 ic_do_bootp_ext(opt);
1097 }
1098 }
1099
1100 /* We have a winner! */
1101 ic_dev = dev;
1102 ic_myaddr = b->your_ip;
1103 ic_servaddr = b->server_ip;
1104 if (ic_gateway == NONE && b->relay_ip)
1105 ic_gateway = b->relay_ip;
1106 if (ic_nameservers[0] == NONE)
1107 ic_nameservers[0] = ic_servaddr;
1108 ic_got_reply = IC_BOOTP;
1109
1110 drop_unlock:
1111 /* Show's over. Nothing to see here. */
1112 spin_unlock(&ic_recv_lock);
1113
1114 drop:
1115 /* Throw the packet out. */
1116 kfree_skb(skb);
1117
1118 return 0;
1119 }
1120
1121
1122 #endif
1123
1124
1125 /*
1126 * Dynamic IP configuration -- DHCP, BOOTP, RARP.
1127 */
1128
1129 #ifdef IPCONFIG_DYNAMIC
1130
1131 static int __init ic_dynamic(void)
1132 {
1133 int retries;
1134 struct ic_device *d;
1135 unsigned long start_jiffies, timeout, jiff;
1136 int do_bootp = ic_proto_have_if & IC_BOOTP;
1137 int do_rarp = ic_proto_have_if & IC_RARP;
1138
1139 /*
1140 * If none of DHCP/BOOTP/RARP was selected, return with an error.
1141 * This routine gets only called when some pieces of information
1142 * are missing, and without DHCP/BOOTP/RARP we are unable to get it.
1143 */
1144 if (!ic_proto_enabled) {
1145 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
1146 return -1;
1147 }
1148
1149 #ifdef IPCONFIG_BOOTP
1150 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
1151 printk(KERN_ERR "DHCP/BOOTP: No suitable device found.\n");
1152 #endif
1153 #ifdef IPCONFIG_RARP
1154 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)
1155 printk(KERN_ERR "RARP: No suitable device found.\n");
1156 #endif
1157
1158 if (!ic_proto_have_if)
1159 /* Error message already printed */
1160 return -1;
1161
1162 /*
1163 * Setup protocols
1164 */
1165 #ifdef IPCONFIG_BOOTP
1166 if (do_bootp)
1167 ic_bootp_init();
1168 #endif
1169 #ifdef IPCONFIG_RARP
1170 if (do_rarp)
1171 ic_rarp_init();
1172 #endif
1173
1174 /*
1175 * Send requests and wait, until we get an answer. This loop
1176 * seems to be a terrible waste of CPU time, but actually there is
1177 * only one process running at all, so we don't need to use any
1178 * scheduler functions.
1179 * [Actually we could now, but the nothing else running note still
1180 * applies.. - AC]
1181 */
1182 printk(KERN_NOTICE "Sending %s%s%s requests .",
1183 do_bootp
1184 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "",
1185 (do_bootp && do_rarp) ? " and " : "",
1186 do_rarp ? "RARP" : "");
1187
1188 start_jiffies = jiffies;
1189 d = ic_first_dev;
1190 retries = CONF_SEND_RETRIES;
1191 get_random_bytes(&timeout, sizeof(timeout));
1192 timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned) CONF_TIMEOUT_RANDOM);
1193 for (;;) {
1194 /* Track the device we are configuring */
1195 ic_dev_xid = d->xid;
1196
1197 #ifdef IPCONFIG_BOOTP
1198 if (do_bootp && (d->able & IC_BOOTP))
1199 ic_bootp_send_if(d, jiffies - start_jiffies);
1200 #endif
1201 #ifdef IPCONFIG_RARP
1202 if (do_rarp && (d->able & IC_RARP))
1203 ic_rarp_send_if(d);
1204 #endif
1205
1206 jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout);
1207 while (time_before(jiffies, jiff) && !ic_got_reply)
1208 schedule_timeout_uninterruptible(1);
1209 #ifdef IPCONFIG_DHCP
1210 /* DHCP isn't done until we get a DHCPACK. */
1211 if ((ic_got_reply & IC_BOOTP) &&
1212 (ic_proto_enabled & IC_USE_DHCP) &&
1213 ic_dhcp_msgtype != DHCPACK) {
1214 ic_got_reply = 0;
1215 printk(KERN_CONT ",");
1216 continue;
1217 }
1218 #endif /* IPCONFIG_DHCP */
1219
1220 if (ic_got_reply) {
1221 printk(KERN_CONT " OK\n");
1222 break;
1223 }
1224
1225 if ((d = d->next))
1226 continue;
1227
1228 if (! --retries) {
1229 printk(KERN_CONT " timed out!\n");
1230 break;
1231 }
1232
1233 d = ic_first_dev;
1234
1235 timeout = timeout CONF_TIMEOUT_MULT;
1236 if (timeout > CONF_TIMEOUT_MAX)
1237 timeout = CONF_TIMEOUT_MAX;
1238
1239 printk(KERN_CONT ".");
1240 }
1241
1242 #ifdef IPCONFIG_BOOTP
1243 if (do_bootp)
1244 ic_bootp_cleanup();
1245 #endif
1246 #ifdef IPCONFIG_RARP
1247 if (do_rarp)
1248 ic_rarp_cleanup();
1249 #endif
1250
1251 if (!ic_got_reply) {
1252 ic_myaddr = NONE;
1253 return -1;
1254 }
1255
1256 printk("IP-Config: Got %s answer from %pI4, ",
1257 ((ic_got_reply & IC_RARP) ? "RARP"
1258 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),
1259 &ic_servaddr);
1260 printk(KERN_CONT "my address is %pI4\n", &ic_myaddr);
1261
1262 return 0;
1263 }
1264
1265 #endif /* IPCONFIG_DYNAMIC */
1266
1267 #ifdef CONFIG_PROC_FS
1268
1269 static int pnp_seq_show(struct seq_file *seq, void *v)
1270 {
1271 int i;
1272
1273 if (ic_proto_used & IC_PROTO)
1274 seq_printf(seq, "#PROTO: %s\n",
1275 (ic_proto_used & IC_RARP) ? "RARP"
1276 : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP");
1277 else
1278 seq_puts(seq, "#MANUAL\n");
1279
1280 if (ic_domain[0])
1281 seq_printf(seq,
1282 "domain %s\n", ic_domain);
1283 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {
1284 if (ic_nameservers[i] != NONE)
1285 seq_printf(seq, "nameserver %pI4\n",
1286 &ic_nameservers[i]);
1287 }
1288 if (ic_servaddr != NONE)
1289 seq_printf(seq, "bootserver %pI4\n",
1290 &ic_servaddr);
1291 return 0;
1292 }
1293
1294 static int pnp_seq_open(struct inode *indoe, struct file *file)
1295 {
1296 return single_open(file, pnp_seq_show, NULL);
1297 }
1298
1299 static const struct file_operations pnp_seq_fops = {
1300 .owner = THIS_MODULE,
1301 .open = pnp_seq_open,
1302 .read = seq_read,
1303 .llseek = seq_lseek,
1304 .release = single_release,
1305 };
1306 #endif /* CONFIG_PROC_FS */
1307
1308 /*
1309 * Extract IP address from the parameter string if needed. Note that we
1310 * need to have root_server_addr set _before_ IPConfig gets called as it
1311 * can override it.
1312 */
1313 __be32 __init root_nfs_parse_addr(char *name)
1314 {
1315 __be32 addr;
1316 int octets = 0;
1317 char *cp, *cq;
1318
1319 cp = cq = name;
1320 while (octets < 4) {
1321 while (*cp >= '0' && *cp <= '9')
1322 cp++;
1323 if (cp == cq || cp - cq > 3)
1324 break;
1325 if (*cp == '.' || octets == 3)
1326 octets++;
1327 if (octets < 4)
1328 cp++;
1329 cq = cp;
1330 }
1331 if (octets == 4 && (*cp == ':' || *cp == '\0')) {
1332 if (*cp == ':')
1333 *cp++ = '\0';
1334 addr = in_aton(name);
1335 memmove(name, cp, strlen(cp) + 1);
1336 } else
1337 addr = NONE;
1338
1339 return addr;
1340 }
1341
1342 #define DEVICE_WAIT_MAX 12 /* 12 seconds */
1343
1344 static int __init wait_for_devices(void)
1345 {
1346 int i;
1347
1348 for (i = 0; i < DEVICE_WAIT_MAX; i++) {
1349 struct net_device *dev;
1350 int found = 0;
1351
1352 rtnl_lock();
1353 for_each_netdev(&init_net, dev) {
1354 if (ic_is_init_dev(dev)) {
1355 found = 1;
1356 break;
1357 }
1358 }
1359 rtnl_unlock();
1360 if (found)
1361 return 0;
1362 ssleep(1);
1363 }
1364 return -ENODEV;
1365 }
1366
1367 /*
1368 * IP Autoconfig dispatcher.
1369 */
1370
1371 static int __init ip_auto_config(void)
1372 {
1373 __be32 addr;
1374 #ifdef IPCONFIG_DYNAMIC
1375 int retries = CONF_OPEN_RETRIES;
1376 #endif
1377 int err;
1378
1379 #ifdef CONFIG_PROC_FS
1380 proc_net_fops_create(&init_net, "pnp", S_IRUGO, &pnp_seq_fops);
1381 #endif /* CONFIG_PROC_FS */
1382
1383 if (!ic_enable)
1384 return 0;
1385
1386 DBG(("IP-Config: Entered.\n"));
1387 #ifdef IPCONFIG_DYNAMIC
1388 try_try_again:
1389 #endif
1390 /* Wait for devices to appear */
1391 err = wait_for_devices();
1392 if (err)
1393 return err;
1394
1395 /* Setup all network devices */
1396 err = ic_open_devs();
1397 if (err)
1398 return err;
1399
1400 /* Give drivers a chance to settle */
1401 msleep(CONF_POST_OPEN);
1402
1403 /*
1404 * If the config information is insufficient (e.g., our IP address or
1405 * IP address of the boot server is missing or we have multiple network
1406 * interfaces and no default was set), use BOOTP or RARP to get the
1407 * missing values.
1408 */
1409 if (ic_myaddr == NONE ||
1410 #ifdef CONFIG_ROOT_NFS
1411 (root_server_addr == NONE &&
1412 ic_servaddr == NONE &&
1413 ROOT_DEV == Root_NFS) ||
1414 #endif
1415 ic_first_dev->next) {
1416 #ifdef IPCONFIG_DYNAMIC
1417 if (ic_dynamic() < 0) {
1418 ic_close_devs();
1419
1420 /*
1421 * I don't know why, but sometimes the
1422 * eepro100 driver (at least) gets upset and
1423 * doesn't work the first time it's opened.
1424 * But then if you close it and reopen it, it
1425 * works just fine. So we need to try that at
1426 * least once before giving up.
1427 *
1428 * Also, if the root will be NFS-mounted, we
1429 * have nowhere to go if DHCP fails. So we
1430 * just have to keep trying forever.
1431 *
1432 * -- Chip
1433 */
1434 #ifdef CONFIG_ROOT_NFS
1435 if (ROOT_DEV == Root_NFS) {
1436 printk(KERN_ERR
1437 "IP-Config: Retrying forever (NFS root)...\n");
1438 goto try_try_again;
1439 }
1440 #endif
1441
1442 if (--retries) {
1443 printk(KERN_ERR
1444 "IP-Config: Reopening network devices...\n");
1445 goto try_try_again;
1446 }
1447
1448 /* Oh, well. At least we tried. */
1449 printk(KERN_ERR "IP-Config: Auto-configuration of network failed.\n");
1450 return -1;
1451 }
1452 #else /* !DYNAMIC */
1453 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
1454 ic_close_devs();
1455 return -1;
1456 #endif /* IPCONFIG_DYNAMIC */
1457 } else {
1458 /* Device selected manually or only one device -> use it */
1459 ic_dev = ic_first_dev->dev;
1460 }
1461
1462 addr = root_nfs_parse_addr(root_server_path);
1463 if (root_server_addr == NONE)
1464 root_server_addr = addr;
1465
1466 /*
1467 * Use defaults wherever applicable.
1468 */
1469 if (ic_defaults() < 0)
1470 return -1;
1471
1472 /*
1473 * Close all network devices except the device we've
1474 * autoconfigured and set up routes.
1475 */
1476 ic_close_devs();
1477 if (ic_setup_if() < 0 || ic_setup_routes() < 0)
1478 return -1;
1479
1480 /*
1481 * Record which protocol was actually used.
1482 */
1483 #ifdef IPCONFIG_DYNAMIC
1484 ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP);
1485 #endif
1486
1487 #ifndef IPCONFIG_SILENT
1488 /*
1489 * Clue in the operator.
1490 */
1491 printk("IP-Config: Complete:\n");
1492 printk(" device=%s", ic_dev->name);
1493 printk(KERN_CONT ", addr=%pI4", &ic_myaddr);
1494 printk(KERN_CONT ", mask=%pI4", &ic_netmask);
1495 printk(KERN_CONT ", gw=%pI4", &ic_gateway);
1496 printk(KERN_CONT ",\n host=%s, domain=%s, nis-domain=%s",
1497 utsname()->nodename, ic_domain, utsname()->domainname);
1498 printk(KERN_CONT ",\n bootserver=%pI4", &ic_servaddr);
1499 printk(KERN_CONT ", rootserver=%pI4", &root_server_addr);
1500 printk(KERN_CONT ", rootpath=%s", root_server_path);
1501 if (ic_dev_mtu)
1502 printk(KERN_CONT ", mtu=%d", ic_dev_mtu);
1503 printk(KERN_CONT "\n");
1504 #endif /* !SILENT */
1505
1506 return 0;
1507 }
1508
1509 late_initcall(ip_auto_config);
1510
1511
1512 /*
1513 * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
1514 * command line parameter. See Documentation/filesystems/nfs/nfsroot.txt.
1515 */
1516 static int __init ic_proto_name(char *name)
1517 {
1518 if (!strcmp(name, "on") || !strcmp(name, "any")) {
1519 return 1;
1520 }
1521 if (!strcmp(name, "off") || !strcmp(name, "none")) {
1522 return 0;
1523 }
1524 #ifdef CONFIG_IP_PNP_DHCP
1525 else if (!strcmp(name, "dhcp")) {
1526 ic_proto_enabled &= ~IC_RARP;
1527 return 1;
1528 }
1529 #endif
1530 #ifdef CONFIG_IP_PNP_BOOTP
1531 else if (!strcmp(name, "bootp")) {
1532 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP);
1533 return 1;
1534 }
1535 #endif
1536 #ifdef CONFIG_IP_PNP_RARP
1537 else if (!strcmp(name, "rarp")) {
1538 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP);
1539 return 1;
1540 }
1541 #endif
1542 #ifdef IPCONFIG_DYNAMIC
1543 else if (!strcmp(name, "both")) {
1544 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */
1545 return 1;
1546 }
1547 #endif
1548 return 0;
1549 }
1550
1551 static int __init ip_auto_config_setup(char *addrs)
1552 {
1553 char *cp, *ip, *dp;
1554 int num = 0;
1555
1556 ic_set_manually = 1;
1557 ic_enable = 1;
1558
1559 /*
1560 * If any dhcp, bootp etc options are set, leave autoconfig on
1561 * and skip the below static IP processing.
1562 */
1563 if (ic_proto_name(addrs))
1564 return 1;
1565
1566 /* If no static IP is given, turn off autoconfig and bail. */
1567 if (*addrs == 0 ||
1568 strcmp(addrs, "off") == 0 ||
1569 strcmp(addrs, "none") == 0) {
1570 ic_enable = 0;
1571 return 1;
1572 }
1573
1574 /* Parse string for static IP assignment. */
1575 ip = addrs;
1576 while (ip && *ip) {
1577 if ((cp = strchr(ip, ':')))
1578 *cp++ = '\0';
1579 if (strlen(ip) > 0) {
1580 DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip));
1581 switch (num) {
1582 case 0:
1583 if ((ic_myaddr = in_aton(ip)) == ANY)
1584 ic_myaddr = NONE;
1585 break;
1586 case 1:
1587 if ((ic_servaddr = in_aton(ip)) == ANY)
1588 ic_servaddr = NONE;
1589 break;
1590 case 2:
1591 if ((ic_gateway = in_aton(ip)) == ANY)
1592 ic_gateway = NONE;
1593 break;
1594 case 3:
1595 if ((ic_netmask = in_aton(ip)) == ANY)
1596 ic_netmask = NONE;
1597 break;
1598 case 4:
1599 if ((dp = strchr(ip, '.'))) {
1600 *dp++ = '\0';
1601 strlcpy(utsname()->domainname, dp,
1602 sizeof(utsname()->domainname));
1603 }
1604 strlcpy(utsname()->nodename, ip,
1605 sizeof(utsname()->nodename));
1606 ic_host_name_set = 1;
1607 break;
1608 case 5:
1609 strlcpy(user_dev_name, ip, sizeof(user_dev_name));
1610 break;
1611 case 6:
1612 if (ic_proto_name(ip) == 0 &&
1613 ic_myaddr == NONE) {
1614 ic_enable = 0;
1615 }
1616 break;
1617 }
1618 }
1619 ip = cp;
1620 num++;
1621 }
1622
1623 return 1;
1624 }
1625
1626 static int __init nfsaddrs_config_setup(char *addrs)
1627 {
1628 return ip_auto_config_setup(addrs);
1629 }
1630
1631 static int __init vendor_class_identifier_setup(char *addrs)
1632 {
1633 if (strlcpy(vendor_class_identifier, addrs,
1634 sizeof(vendor_class_identifier))
1635 >= sizeof(vendor_class_identifier))
1636 printk(KERN_WARNING "DHCP: vendorclass too long, truncated to \"%s\"",
1637 vendor_class_identifier);
1638 return 1;
1639 }
1640
1641 __setup("ip=", ip_auto_config_setup);
1642 __setup("nfsaddrs=", nfsaddrs_config_setup);
1643 __setup("dhcpclass=", vendor_class_identifier_setup);
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