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[linux-2.6/libata-dev.git] / net / ipv4 / ipconfig.c
blobd763701cff1b4aca032e60f335a4208e054a4e06
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 __be32 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 pr_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 pr_warn("DHCP/BOOTP: Ignoring device %s, MTU %d too small",
227 dev->name, dev->mtu);
228 if (!(dev->flags & IFF_NOARP))
229 able |= IC_RARP;
230 able &= ic_proto_enabled;
231 if (ic_proto_enabled && !able)
232 continue;
233 oflags = dev->flags;
234 if (dev_change_flags(dev, oflags | IFF_UP) < 0) {
235 pr_err("IP-Config: Failed to open %s\n",
236 dev->name);
237 continue;
238 }
239 if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) {
240 rtnl_unlock();
241 return -ENOMEM;
242 }
243 d->dev = dev;
244 *last = d;
245 last = &d->next;
246 d->flags = oflags;
247 d->able = able;
248 if (able & IC_BOOTP)
249 get_random_bytes(&d->xid, sizeof(__be32));
250 else
251 d->xid = 0;
252 ic_proto_have_if |= able;
253 DBG(("IP-Config: %s UP (able=%d, xid=%08x)\n",
254 dev->name, able, d->xid));
255 }
256 }
257
258 /* no point in waiting if we could not bring up at least one device */
259 if (!ic_first_dev)
260 goto have_carrier;
261
262 /* wait for a carrier on at least one device */
263 start = jiffies;
264 while (jiffies - start < msecs_to_jiffies(CONF_CARRIER_TIMEOUT)) {
265 for_each_netdev(&init_net, dev)
266 if (ic_is_init_dev(dev) && netif_carrier_ok(dev))
267 goto have_carrier;
268
269 msleep(1);
270 }
271 have_carrier:
272 rtnl_unlock();
273
274 *last = NULL;
275
276 if (!ic_first_dev) {
277 if (user_dev_name[0])
278 pr_err("IP-Config: Device `%s' not found\n",
279 user_dev_name);
280 else
281 pr_err("IP-Config: No network devices available\n");
282 return -ENODEV;
283 }
284 return 0;
285 }
286
287 static void __init ic_close_devs(void)
288 {
289 struct ic_device *d, *next;
290 struct net_device *dev;
291
292 rtnl_lock();
293 next = ic_first_dev;
294 while ((d = next)) {
295 next = d->next;
296 dev = d->dev;
297 if (dev != ic_dev) {
298 DBG(("IP-Config: Downing %s\n", dev->name));
299 dev_change_flags(dev, d->flags);
300 }
301 kfree(d);
302 }
303 rtnl_unlock();
304 }
305
306 /*
307 * Interface to various network functions.
308 */
309
310 static inline void
311 set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port)
312 {
313 sin->sin_family = AF_INET;
314 sin->sin_addr.s_addr = addr;
315 sin->sin_port = port;
316 }
317
318 static int __init ic_devinet_ioctl(unsigned int cmd, struct ifreq *arg)
319 {
320 int res;
321
322 mm_segment_t oldfs = get_fs();
323 set_fs(get_ds());
324 res = devinet_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
325 set_fs(oldfs);
326 return res;
327 }
328
329 static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg)
330 {
331 int res;
332
333 mm_segment_t oldfs = get_fs();
334 set_fs(get_ds());
335 res = dev_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
336 set_fs(oldfs);
337 return res;
338 }
339
340 static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg)
341 {
342 int res;
343
344 mm_segment_t oldfs = get_fs();
345 set_fs(get_ds());
346 res = ip_rt_ioctl(&init_net, cmd, (void __user *) arg);
347 set_fs(oldfs);
348 return res;
349 }
350
351 /*
352 * Set up interface addresses and routes.
353 */
354
355 static int __init ic_setup_if(void)
356 {
357 struct ifreq ir;
358 struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr;
359 int err;
360
361 memset(&ir, 0, sizeof(ir));
362 strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name);
363 set_sockaddr(sin, ic_myaddr, 0);
364 if ((err = ic_devinet_ioctl(SIOCSIFADDR, &ir)) < 0) {
365 pr_err("IP-Config: Unable to set interface address (%d)\n",
366 err);
367 return -1;
368 }
369 set_sockaddr(sin, ic_netmask, 0);
370 if ((err = ic_devinet_ioctl(SIOCSIFNETMASK, &ir)) < 0) {
371 pr_err("IP-Config: Unable to set interface netmask (%d)\n",
372 err);
373 return -1;
374 }
375 set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0);
376 if ((err = ic_devinet_ioctl(SIOCSIFBRDADDR, &ir)) < 0) {
377 pr_err("IP-Config: Unable to set interface broadcast address (%d)\n",
378 err);
379 return -1;
380 }
381 /* Handle the case where we need non-standard MTU on the boot link (a network
382 * using jumbo frames, for instance). If we can't set the mtu, don't error
383 * out, we'll try to muddle along.
384 */
385 if (ic_dev_mtu != 0) {
386 strcpy(ir.ifr_name, ic_dev->name);
387 ir.ifr_mtu = ic_dev_mtu;
388 if ((err = ic_dev_ioctl(SIOCSIFMTU, &ir)) < 0)
389 pr_err("IP-Config: Unable to set interface mtu to %d (%d)\n",
390 ic_dev_mtu, err);
391 }
392 return 0;
393 }
394
395 static int __init ic_setup_routes(void)
396 {
397 /* No need to setup device routes, only the default route... */
398
399 if (ic_gateway != NONE) {
400 struct rtentry rm;
401 int err;
402
403 memset(&rm, 0, sizeof(rm));
404 if ((ic_gateway ^ ic_myaddr) & ic_netmask) {
405 pr_err("IP-Config: Gateway not on directly connected network\n");
406 return -1;
407 }
408 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0);
409 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0);
410 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0);
411 rm.rt_flags = RTF_UP | RTF_GATEWAY;
412 if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) {
413 pr_err("IP-Config: Cannot add default route (%d)\n",
414 err);
415 return -1;
416 }
417 }
418
419 return 0;
420 }
421
422 /*
423 * Fill in default values for all missing parameters.
424 */
425
426 static int __init ic_defaults(void)
427 {
428 /*
429 * At this point we have no userspace running so need not
430 * claim locks on system_utsname
431 */
432
433 if (!ic_host_name_set)
434 sprintf(init_utsname()->nodename, "%pI4", &ic_myaddr);
435
436 if (root_server_addr == NONE)
437 root_server_addr = ic_servaddr;
438
439 if (ic_netmask == NONE) {
440 if (IN_CLASSA(ntohl(ic_myaddr)))
441 ic_netmask = htonl(IN_CLASSA_NET);
442 else if (IN_CLASSB(ntohl(ic_myaddr)))
443 ic_netmask = htonl(IN_CLASSB_NET);
444 else if (IN_CLASSC(ntohl(ic_myaddr)))
445 ic_netmask = htonl(IN_CLASSC_NET);
446 else {
447 pr_err("IP-Config: Unable to guess netmask for address %pI4\n",
448 &ic_myaddr);
449 return -1;
450 }
451 printk("IP-Config: Guessing netmask %pI4\n", &ic_netmask);
452 }
453
454 return 0;
455 }
456
457 /*
458 * RARP support.
459 */
460
461 #ifdef IPCONFIG_RARP
462
463 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
464
465 static struct packet_type rarp_packet_type __initdata = {
466 .type = cpu_to_be16(ETH_P_RARP),
467 .func = ic_rarp_recv,
468 };
469
470 static inline void __init ic_rarp_init(void)
471 {
472 dev_add_pack(&rarp_packet_type);
473 }
474
475 static inline void __init ic_rarp_cleanup(void)
476 {
477 dev_remove_pack(&rarp_packet_type);
478 }
479
480 /*
481 * Process received RARP packet.
482 */
483 static int __init
484 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
485 {
486 struct arphdr *rarp;
487 unsigned char *rarp_ptr;
488 __be32 sip, tip;
489 unsigned char *sha, *tha; /* s for "source", t for "target" */
490 struct ic_device *d;
491
492 if (!net_eq(dev_net(dev), &init_net))
493 goto drop;
494
495 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
496 return NET_RX_DROP;
497
498 if (!pskb_may_pull(skb, sizeof(struct arphdr)))
499 goto drop;
500
501 /* Basic sanity checks can be done without the lock. */
502 rarp = (struct arphdr *)skb_transport_header(skb);
503
504 /* If this test doesn't pass, it's not IP, or we should
505 * ignore it anyway.
506 */
507 if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd))
508 goto drop;
509
510 /* If it's not a RARP reply, delete it. */
511 if (rarp->ar_op != htons(ARPOP_RREPLY))
512 goto drop;
513
514 /* If it's not Ethernet, delete it. */
515 if (rarp->ar_pro != htons(ETH_P_IP))
516 goto drop;
517
518 if (!pskb_may_pull(skb, arp_hdr_len(dev)))
519 goto drop;
520
521 /* OK, it is all there and looks valid, process... */
522 rarp = (struct arphdr *)skb_transport_header(skb);
523 rarp_ptr = (unsigned char *) (rarp + 1);
524
525 /* One reply at a time, please. */
526 spin_lock(&ic_recv_lock);
527
528 /* If we already have a reply, just drop the packet */
529 if (ic_got_reply)
530 goto drop_unlock;
531
532 /* Find the ic_device that the packet arrived on */
533 d = ic_first_dev;
534 while (d && d->dev != dev)
535 d = d->next;
536 if (!d)
537 goto drop_unlock; /* should never happen */
538
539 /* Extract variable-width fields */
540 sha = rarp_ptr;
541 rarp_ptr += dev->addr_len;
542 memcpy(&sip, rarp_ptr, 4);
543 rarp_ptr += 4;
544 tha = rarp_ptr;
545 rarp_ptr += dev->addr_len;
546 memcpy(&tip, rarp_ptr, 4);
547
548 /* Discard packets which are not meant for us. */
549 if (memcmp(tha, dev->dev_addr, dev->addr_len))
550 goto drop_unlock;
551
552 /* Discard packets which are not from specified server. */
553 if (ic_servaddr != NONE && ic_servaddr != sip)
554 goto drop_unlock;
555
556 /* We have a winner! */
557 ic_dev = dev;
558 if (ic_myaddr == NONE)
559 ic_myaddr = tip;
560 ic_servaddr = sip;
561 ic_got_reply = IC_RARP;
562
563 drop_unlock:
564 /* Show's over. Nothing to see here. */
565 spin_unlock(&ic_recv_lock);
566
567 drop:
568 /* Throw the packet out. */
569 kfree_skb(skb);
570 return 0;
571 }
572
573
574 /*
575 * Send RARP request packet over a single interface.
576 */
577 static void __init ic_rarp_send_if(struct ic_device *d)
578 {
579 struct net_device *dev = d->dev;
580 arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL,
581 dev->dev_addr, dev->dev_addr);
582 }
583 #endif
584
585 /*
586 * Predefine Nameservers
587 */
588 static inline void __init ic_nameservers_predef(void)
589 {
590 int i;
591
592 for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
593 ic_nameservers[i] = NONE;
594 }
595
596 /*
597 * DHCP/BOOTP support.
598 */
599
600 #ifdef IPCONFIG_BOOTP
601
602 struct bootp_pkt { /* BOOTP packet format */
603 struct iphdr iph; /* IP header */
604 struct udphdr udph; /* UDP header */
605 u8 op; /* 1=request, 2=reply */
606 u8 htype; /* HW address type */
607 u8 hlen; /* HW address length */
608 u8 hops; /* Used only by gateways */
609 __be32 xid; /* Transaction ID */
610 __be16 secs; /* Seconds since we started */
611 __be16 flags; /* Just what it says */
612 __be32 client_ip; /* Client's IP address if known */
613 __be32 your_ip; /* Assigned IP address */
614 __be32 server_ip; /* (Next, e.g. NFS) Server's IP address */
615 __be32 relay_ip; /* IP address of BOOTP relay */
616 u8 hw_addr[16]; /* Client's HW address */
617 u8 serv_name[64]; /* Server host name */
618 u8 boot_file[128]; /* Name of boot file */
619 u8 exten[312]; /* DHCP options / BOOTP vendor extensions */
620 };
621
622 /* packet ops */
623 #define BOOTP_REQUEST 1
624 #define BOOTP_REPLY 2
625
626 /* DHCP message types */
627 #define DHCPDISCOVER 1
628 #define DHCPOFFER 2
629 #define DHCPREQUEST 3
630 #define DHCPDECLINE 4
631 #define DHCPACK 5
632 #define DHCPNAK 6
633 #define DHCPRELEASE 7
634 #define DHCPINFORM 8
635
636 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
637
638 static struct packet_type bootp_packet_type __initdata = {
639 .type = cpu_to_be16(ETH_P_IP),
640 .func = ic_bootp_recv,
641 };
642
643
644 /*
645 * Initialize DHCP/BOOTP extension fields in the request.
646 */
647
648 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 };
649
650 #ifdef IPCONFIG_DHCP
651
652 static void __init
653 ic_dhcp_init_options(u8 *options)
654 {
655 u8 mt = ((ic_servaddr == NONE)
656 ? DHCPDISCOVER : DHCPREQUEST);
657 u8 *e = options;
658 int len;
659
660 #ifdef IPCONFIG_DEBUG
661 printk("DHCP: Sending message type %d\n", mt);
662 #endif
663
664 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */
665 e += 4;
666
667 *e++ = 53; /* DHCP message type */
668 *e++ = 1;
669 *e++ = mt;
670
671 if (mt == DHCPREQUEST) {
672 *e++ = 54; /* Server ID (IP address) */
673 *e++ = 4;
674 memcpy(e, &ic_servaddr, 4);
675 e += 4;
676
677 *e++ = 50; /* Requested IP address */
678 *e++ = 4;
679 memcpy(e, &ic_myaddr, 4);
680 e += 4;
681 }
682
683 /* always? */
684 {
685 static const u8 ic_req_params[] = {
686 1, /* Subnet mask */
687 3, /* Default gateway */
688 6, /* DNS server */
689 12, /* Host name */
690 15, /* Domain name */
691 17, /* Boot path */
692 26, /* MTU */
693 40, /* NIS domain name */
694 };
695
696 *e++ = 55; /* Parameter request list */
697 *e++ = sizeof(ic_req_params);
698 memcpy(e, ic_req_params, sizeof(ic_req_params));
699 e += sizeof(ic_req_params);
700
701 if (ic_host_name_set) {
702 *e++ = 12; /* host-name */
703 len = strlen(utsname()->nodename);
704 *e++ = len;
705 memcpy(e, utsname()->nodename, len);
706 e += len;
707 }
708 if (*vendor_class_identifier) {
709 pr_info("DHCP: sending class identifier \"%s\"\n",
710 vendor_class_identifier);
711 *e++ = 60; /* Class-identifier */
712 len = strlen(vendor_class_identifier);
713 *e++ = len;
714 memcpy(e, vendor_class_identifier, len);
715 e += len;
716 }
717 }
718
719 *e++ = 255; /* End of the list */
720 }
721
722 #endif /* IPCONFIG_DHCP */
723
724 static void __init ic_bootp_init_ext(u8 *e)
725 {
726 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */
727 e += 4;
728 *e++ = 1; /* Subnet mask request */
729 *e++ = 4;
730 e += 4;
731 *e++ = 3; /* Default gateway request */
732 *e++ = 4;
733 e += 4;
734 *e++ = 5; /* Name server request */
735 *e++ = 8;
736 e += 8;
737 *e++ = 12; /* Host name request */
738 *e++ = 32;
739 e += 32;
740 *e++ = 40; /* NIS Domain name request */
741 *e++ = 32;
742 e += 32;
743 *e++ = 17; /* Boot path */
744 *e++ = 40;
745 e += 40;
746
747 *e++ = 57; /* set extension buffer size for reply */
748 *e++ = 2;
749 *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */
750 *e++ = 150;
751
752 *e++ = 255; /* End of the list */
753 }
754
755
756 /*
757 * Initialize the DHCP/BOOTP mechanism.
758 */
759 static inline void __init ic_bootp_init(void)
760 {
761 ic_nameservers_predef();
762
763 dev_add_pack(&bootp_packet_type);
764 }
765
766
767 /*
768 * DHCP/BOOTP cleanup.
769 */
770 static inline void __init ic_bootp_cleanup(void)
771 {
772 dev_remove_pack(&bootp_packet_type);
773 }
774
775
776 /*
777 * Send DHCP/BOOTP request to single interface.
778 */
779 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff)
780 {
781 struct net_device *dev = d->dev;
782 struct sk_buff *skb;
783 struct bootp_pkt *b;
784 struct iphdr *h;
785 int hlen = LL_RESERVED_SPACE(dev);
786 int tlen = dev->needed_tailroom;
787
788 /* Allocate packet */
789 skb = alloc_skb(sizeof(struct bootp_pkt) + hlen + tlen + 15,
790 GFP_KERNEL);
791 if (!skb)
792 return;
793 skb_reserve(skb, hlen);
794 b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt));
795 memset(b, 0, sizeof(struct bootp_pkt));
796
797 /* Construct IP header */
798 skb_reset_network_header(skb);
799 h = ip_hdr(skb);
800 h->version = 4;
801 h->ihl = 5;
802 h->tot_len = htons(sizeof(struct bootp_pkt));
803 h->frag_off = htons(IP_DF);
804 h->ttl = 64;
805 h->protocol = IPPROTO_UDP;
806 h->daddr = htonl(INADDR_BROADCAST);
807 h->check = ip_fast_csum((unsigned char *) h, h->ihl);
808
809 /* Construct UDP header */
810 b->udph.source = htons(68);
811 b->udph.dest = htons(67);
812 b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr));
813 /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */
814
815 /* Construct DHCP/BOOTP header */
816 b->op = BOOTP_REQUEST;
817 if (dev->type < 256) /* check for false types */
818 b->htype = dev->type;
819 else if (dev->type == ARPHRD_FDDI)
820 b->htype = ARPHRD_ETHER;
821 else {
822 printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name);
823 b->htype = dev->type; /* can cause undefined behavior */
824 }
825
826 /* server_ip and your_ip address are both already zero per RFC2131 */
827 b->hlen = dev->addr_len;
828 memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
829 b->secs = htons(jiffies_diff / HZ);
830 b->xid = d->xid;
831
832 /* add DHCP options or BOOTP extensions */
833 #ifdef IPCONFIG_DHCP
834 if (ic_proto_enabled & IC_USE_DHCP)
835 ic_dhcp_init_options(b->exten);
836 else
837 #endif
838 ic_bootp_init_ext(b->exten);
839
840 /* Chain packet down the line... */
841 skb->dev = dev;
842 skb->protocol = htons(ETH_P_IP);
843 if (dev_hard_header(skb, dev, ntohs(skb->protocol),
844 dev->broadcast, dev->dev_addr, skb->len) < 0) {
845 kfree_skb(skb);
846 printk("E");
847 return;
848 }
849
850 if (dev_queue_xmit(skb) < 0)
851 printk("E");
852 }
853
854
855 /*
856 * Copy BOOTP-supplied string if not already set.
857 */
858 static int __init ic_bootp_string(char *dest, char *src, int len, int max)
859 {
860 if (!len)
861 return 0;
862 if (len > max-1)
863 len = max-1;
864 memcpy(dest, src, len);
865 dest[len] = '\0';
866 return 1;
867 }
868
869
870 /*
871 * Process BOOTP extensions.
872 */
873 static void __init ic_do_bootp_ext(u8 *ext)
874 {
875 u8 servers;
876 int i;
877 __be16 mtu;
878
879 #ifdef IPCONFIG_DEBUG
880 u8 *c;
881
882 printk("DHCP/BOOTP: Got extension %d:",*ext);
883 for (c=ext+2; c<ext+2+ext[1]; c++)
884 printk(" %02x", *c);
885 printk("\n");
886 #endif
887
888 switch (*ext++) {
889 case 1: /* Subnet mask */
890 if (ic_netmask == NONE)
891 memcpy(&ic_netmask, ext+1, 4);
892 break;
893 case 3: /* Default gateway */
894 if (ic_gateway == NONE)
895 memcpy(&ic_gateway, ext+1, 4);
896 break;
897 case 6: /* DNS server */
898 servers= *ext/4;
899 if (servers > CONF_NAMESERVERS_MAX)
900 servers = CONF_NAMESERVERS_MAX;
901 for (i = 0; i < servers; i++) {
902 if (ic_nameservers[i] == NONE)
903 memcpy(&ic_nameservers[i], ext+1+4*i, 4);
904 }
905 break;
906 case 12: /* Host name */
907 ic_bootp_string(utsname()->nodename, ext+1, *ext,
908 __NEW_UTS_LEN);
909 ic_host_name_set = 1;
910 break;
911 case 15: /* Domain name (DNS) */
912 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
913 break;
914 case 17: /* Root path */
915 if (!root_server_path[0])
916 ic_bootp_string(root_server_path, ext+1, *ext,
917 sizeof(root_server_path));
918 break;
919 case 26: /* Interface MTU */
920 memcpy(&mtu, ext+1, sizeof(mtu));
921 ic_dev_mtu = ntohs(mtu);
922 break;
923 case 40: /* NIS Domain name (_not_ DNS) */
924 ic_bootp_string(utsname()->domainname, ext+1, *ext,
925 __NEW_UTS_LEN);
926 break;
927 }
928 }
929
930
931 /*
932 * Receive BOOTP reply.
933 */
934 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
935 {
936 struct bootp_pkt *b;
937 struct iphdr *h;
938 struct ic_device *d;
939 int len, ext_len;
940
941 if (!net_eq(dev_net(dev), &init_net))
942 goto drop;
943
944 /* Perform verifications before taking the lock. */
945 if (skb->pkt_type == PACKET_OTHERHOST)
946 goto drop;
947
948 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
949 return NET_RX_DROP;
950
951 if (!pskb_may_pull(skb,
952 sizeof(struct iphdr) +
953 sizeof(struct udphdr)))
954 goto drop;
955
956 b = (struct bootp_pkt *)skb_network_header(skb);
957 h = &b->iph;
958
959 if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP)
960 goto drop;
961
962 /* Fragments are not supported */
963 if (ip_is_fragment(h)) {
964 net_err_ratelimited("DHCP/BOOTP: Ignoring fragmented reply\n");
965 goto drop;
966 }
967
968 if (skb->len < ntohs(h->tot_len))
969 goto drop;
970
971 if (ip_fast_csum((char *) h, h->ihl))
972 goto drop;
973
974 if (b->udph.source != htons(67) || b->udph.dest != htons(68))
975 goto drop;
976
977 if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
978 goto drop;
979
980 len = ntohs(b->udph.len) - sizeof(struct udphdr);
981 ext_len = len - (sizeof(*b) -
982 sizeof(struct iphdr) -
983 sizeof(struct udphdr) -
984 sizeof(b->exten));
985 if (ext_len < 0)
986 goto drop;
987
988 /* Ok the front looks good, make sure we can get at the rest. */
989 if (!pskb_may_pull(skb, skb->len))
990 goto drop;
991
992 b = (struct bootp_pkt *)skb_network_header(skb);
993 h = &b->iph;
994
995 /* One reply at a time, please. */
996 spin_lock(&ic_recv_lock);
997
998 /* If we already have a reply, just drop the packet */
999 if (ic_got_reply)
1000 goto drop_unlock;
1001
1002 /* Find the ic_device that the packet arrived on */
1003 d = ic_first_dev;
1004 while (d && d->dev != dev)
1005 d = d->next;
1006 if (!d)
1007 goto drop_unlock; /* should never happen */
1008
1009 /* Is it a reply to our BOOTP request? */
1010 if (b->op != BOOTP_REPLY ||
1011 b->xid != d->xid) {
1012 net_err_ratelimited("DHCP/BOOTP: Reply not for us, op[%x] xid[%x]\n",
1013 b->op, b->xid);
1014 goto drop_unlock;
1015 }
1016
1017 /* Is it a reply for the device we are configuring? */
1018 if (b->xid != ic_dev_xid) {
1019 net_err_ratelimited("DHCP/BOOTP: Ignoring delayed packet\n");
1020 goto drop_unlock;
1021 }
1022
1023 /* Parse extensions */
1024 if (ext_len >= 4 &&
1025 !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */
1026 u8 *end = (u8 *) b + ntohs(b->iph.tot_len);
1027 u8 *ext;
1028
1029 #ifdef IPCONFIG_DHCP
1030 if (ic_proto_enabled & IC_USE_DHCP) {
1031 __be32 server_id = NONE;
1032 int mt = 0;
1033
1034 ext = &b->exten[4];
1035 while (ext < end && *ext != 0xff) {
1036 u8 *opt = ext++;
1037 if (*opt == 0) /* Padding */
1038 continue;
1039 ext += *ext + 1;
1040 if (ext >= end)
1041 break;
1042 switch (*opt) {
1043 case 53: /* Message type */
1044 if (opt[1])
1045 mt = opt[2];
1046 break;
1047 case 54: /* Server ID (IP address) */
1048 if (opt[1] >= 4)
1049 memcpy(&server_id, opt + 2, 4);
1050 break;
1051 }
1052 }
1053
1054 #ifdef IPCONFIG_DEBUG
1055 printk("DHCP: Got message type %d\n", mt);
1056 #endif
1057
1058 switch (mt) {
1059 case DHCPOFFER:
1060 /* While in the process of accepting one offer,
1061 * ignore all others.
1062 */
1063 if (ic_myaddr != NONE)
1064 goto drop_unlock;
1065
1066 /* Let's accept that offer. */
1067 ic_myaddr = b->your_ip;
1068 ic_servaddr = server_id;
1069 #ifdef IPCONFIG_DEBUG
1070 printk("DHCP: Offered address %pI4 by server %pI4\n",
1071 &ic_myaddr, &ic_servaddr);
1072 #endif
1073 /* The DHCP indicated server address takes
1074 * precedence over the bootp header one if
1075 * they are different.
1076 */
1077 if ((server_id != NONE) &&
1078 (b->server_ip != server_id))
1079 b->server_ip = ic_servaddr;
1080 break;
1081
1082 case DHCPACK:
1083 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0)
1084 goto drop_unlock;
1085
1086 /* Yeah! */
1087 break;
1088
1089 default:
1090 /* Urque. Forget it*/
1091 ic_myaddr = NONE;
1092 ic_servaddr = NONE;
1093 goto drop_unlock;
1094 }
1095
1096 ic_dhcp_msgtype = mt;
1097
1098 }
1099 #endif /* IPCONFIG_DHCP */
1100
1101 ext = &b->exten[4];
1102 while (ext < end && *ext != 0xff) {
1103 u8 *opt = ext++;
1104 if (*opt == 0) /* Padding */
1105 continue;
1106 ext += *ext + 1;
1107 if (ext < end)
1108 ic_do_bootp_ext(opt);
1109 }
1110 }
1111
1112 /* We have a winner! */
1113 ic_dev = dev;
1114 ic_myaddr = b->your_ip;
1115 ic_servaddr = b->server_ip;
1116 if (ic_gateway == NONE && b->relay_ip)
1117 ic_gateway = b->relay_ip;
1118 if (ic_nameservers[0] == NONE)
1119 ic_nameservers[0] = ic_servaddr;
1120 ic_got_reply = IC_BOOTP;
1121
1122 drop_unlock:
1123 /* Show's over. Nothing to see here. */
1124 spin_unlock(&ic_recv_lock);
1125
1126 drop:
1127 /* Throw the packet out. */
1128 kfree_skb(skb);
1129
1130 return 0;
1131 }
1132
1133
1134 #endif
1135
1136
1137 /*
1138 * Dynamic IP configuration -- DHCP, BOOTP, RARP.
1139 */
1140
1141 #ifdef IPCONFIG_DYNAMIC
1142
1143 static int __init ic_dynamic(void)
1144 {
1145 int retries;
1146 struct ic_device *d;
1147 unsigned long start_jiffies, timeout, jiff;
1148 int do_bootp = ic_proto_have_if & IC_BOOTP;
1149 int do_rarp = ic_proto_have_if & IC_RARP;
1150
1151 /*
1152 * If none of DHCP/BOOTP/RARP was selected, return with an error.
1153 * This routine gets only called when some pieces of information
1154 * are missing, and without DHCP/BOOTP/RARP we are unable to get it.
1155 */
1156 if (!ic_proto_enabled) {
1157 pr_err("IP-Config: Incomplete network configuration information\n");
1158 return -1;
1159 }
1160
1161 #ifdef IPCONFIG_BOOTP
1162 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
1163 pr_err("DHCP/BOOTP: No suitable device found\n");
1164 #endif
1165 #ifdef IPCONFIG_RARP
1166 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)
1167 pr_err("RARP: No suitable device found\n");
1168 #endif
1169
1170 if (!ic_proto_have_if)
1171 /* Error message already printed */
1172 return -1;
1173
1174 /*
1175 * Setup protocols
1176 */
1177 #ifdef IPCONFIG_BOOTP
1178 if (do_bootp)
1179 ic_bootp_init();
1180 #endif
1181 #ifdef IPCONFIG_RARP
1182 if (do_rarp)
1183 ic_rarp_init();
1184 #endif
1185
1186 /*
1187 * Send requests and wait, until we get an answer. This loop
1188 * seems to be a terrible waste of CPU time, but actually there is
1189 * only one process running at all, so we don't need to use any
1190 * scheduler functions.
1191 * [Actually we could now, but the nothing else running note still
1192 * applies.. - AC]
1193 */
1194 pr_notice("Sending %s%s%s requests .",
1195 do_bootp
1196 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "",
1197 (do_bootp && do_rarp) ? " and " : "",
1198 do_rarp ? "RARP" : "");
1199
1200 start_jiffies = jiffies;
1201 d = ic_first_dev;
1202 retries = CONF_SEND_RETRIES;
1203 get_random_bytes(&timeout, sizeof(timeout));
1204 timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned int) CONF_TIMEOUT_RANDOM);
1205 for (;;) {
1206 /* Track the device we are configuring */
1207 ic_dev_xid = d->xid;
1208
1209 #ifdef IPCONFIG_BOOTP
1210 if (do_bootp && (d->able & IC_BOOTP))
1211 ic_bootp_send_if(d, jiffies - start_jiffies);
1212 #endif
1213 #ifdef IPCONFIG_RARP
1214 if (do_rarp && (d->able & IC_RARP))
1215 ic_rarp_send_if(d);
1216 #endif
1217
1218 jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout);
1219 while (time_before(jiffies, jiff) && !ic_got_reply)
1220 schedule_timeout_uninterruptible(1);
1221 #ifdef IPCONFIG_DHCP
1222 /* DHCP isn't done until we get a DHCPACK. */
1223 if ((ic_got_reply & IC_BOOTP) &&
1224 (ic_proto_enabled & IC_USE_DHCP) &&
1225 ic_dhcp_msgtype != DHCPACK) {
1226 ic_got_reply = 0;
1227 pr_cont(",");
1228 continue;
1229 }
1230 #endif /* IPCONFIG_DHCP */
1231
1232 if (ic_got_reply) {
1233 pr_cont(" OK\n");
1234 break;
1235 }
1236
1237 if ((d = d->next))
1238 continue;
1239
1240 if (! --retries) {
1241 pr_cont(" timed out!\n");
1242 break;
1243 }
1244
1245 d = ic_first_dev;
1246
1247 timeout = timeout CONF_TIMEOUT_MULT;
1248 if (timeout > CONF_TIMEOUT_MAX)
1249 timeout = CONF_TIMEOUT_MAX;
1250
1251 pr_cont(".");
1252 }
1253
1254 #ifdef IPCONFIG_BOOTP
1255 if (do_bootp)
1256 ic_bootp_cleanup();
1257 #endif
1258 #ifdef IPCONFIG_RARP
1259 if (do_rarp)
1260 ic_rarp_cleanup();
1261 #endif
1262
1263 if (!ic_got_reply) {
1264 ic_myaddr = NONE;
1265 return -1;
1266 }
1267
1268 printk("IP-Config: Got %s answer from %pI4, ",
1269 ((ic_got_reply & IC_RARP) ? "RARP"
1270 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),
1271 &ic_servaddr);
1272 pr_cont("my address is %pI4\n", &ic_myaddr);
1273
1274 return 0;
1275 }
1276
1277 #endif /* IPCONFIG_DYNAMIC */
1278
1279 #ifdef CONFIG_PROC_FS
1280
1281 static int pnp_seq_show(struct seq_file *seq, void *v)
1282 {
1283 int i;
1284
1285 if (ic_proto_used & IC_PROTO)
1286 seq_printf(seq, "#PROTO: %s\n",
1287 (ic_proto_used & IC_RARP) ? "RARP"
1288 : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP");
1289 else
1290 seq_puts(seq, "#MANUAL\n");
1291
1292 if (ic_domain[0])
1293 seq_printf(seq,
1294 "domain %s\n", ic_domain);
1295 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {
1296 if (ic_nameservers[i] != NONE)
1297 seq_printf(seq, "nameserver %pI4\n",
1298 &ic_nameservers[i]);
1299 }
1300 if (ic_servaddr != NONE)
1301 seq_printf(seq, "bootserver %pI4\n",
1302 &ic_servaddr);
1303 return 0;
1304 }
1305
1306 static int pnp_seq_open(struct inode *indoe, struct file *file)
1307 {
1308 return single_open(file, pnp_seq_show, NULL);
1309 }
1310
1311 static const struct file_operations pnp_seq_fops = {
1312 .owner = THIS_MODULE,
1313 .open = pnp_seq_open,
1314 .read = seq_read,
1315 .llseek = seq_lseek,
1316 .release = single_release,
1317 };
1318 #endif /* CONFIG_PROC_FS */
1319
1320 /*
1321 * Extract IP address from the parameter string if needed. Note that we
1322 * need to have root_server_addr set _before_ IPConfig gets called as it
1323 * can override it.
1324 */
1325 __be32 __init root_nfs_parse_addr(char *name)
1326 {
1327 __be32 addr;
1328 int octets = 0;
1329 char *cp, *cq;
1330
1331 cp = cq = name;
1332 while (octets < 4) {
1333 while (*cp >= '0' && *cp <= '9')
1334 cp++;
1335 if (cp == cq || cp - cq > 3)
1336 break;
1337 if (*cp == '.' || octets == 3)
1338 octets++;
1339 if (octets < 4)
1340 cp++;
1341 cq = cp;
1342 }
1343 if (octets == 4 && (*cp == ':' || *cp == '\0')) {
1344 if (*cp == ':')
1345 *cp++ = '\0';
1346 addr = in_aton(name);
1347 memmove(name, cp, strlen(cp) + 1);
1348 } else
1349 addr = NONE;
1350
1351 return addr;
1352 }
1353
1354 #define DEVICE_WAIT_MAX 12 /* 12 seconds */
1355
1356 static int __init wait_for_devices(void)
1357 {
1358 int i;
1359
1360 for (i = 0; i < DEVICE_WAIT_MAX; i++) {
1361 struct net_device *dev;
1362 int found = 0;
1363
1364 rtnl_lock();
1365 for_each_netdev(&init_net, dev) {
1366 if (ic_is_init_dev(dev)) {
1367 found = 1;
1368 break;
1369 }
1370 }
1371 rtnl_unlock();
1372 if (found)
1373 return 0;
1374 ssleep(1);
1375 }
1376 return -ENODEV;
1377 }
1378
1379 /*
1380 * IP Autoconfig dispatcher.
1381 */
1382
1383 static int __init ip_auto_config(void)
1384 {
1385 __be32 addr;
1386 #ifdef IPCONFIG_DYNAMIC
1387 int retries = CONF_OPEN_RETRIES;
1388 #endif
1389 int err;
1390 unsigned int i;
1391
1392 #ifdef CONFIG_PROC_FS
1393 proc_net_fops_create(&init_net, "pnp", S_IRUGO, &pnp_seq_fops);
1394 #endif /* CONFIG_PROC_FS */
1395
1396 if (!ic_enable)
1397 return 0;
1398
1399 DBG(("IP-Config: Entered.\n"));
1400 #ifdef IPCONFIG_DYNAMIC
1401 try_try_again:
1402 #endif
1403 /* Wait for devices to appear */
1404 err = wait_for_devices();
1405 if (err)
1406 return err;
1407
1408 /* Setup all network devices */
1409 err = ic_open_devs();
1410 if (err)
1411 return err;
1412
1413 /* Give drivers a chance to settle */
1414 msleep(CONF_POST_OPEN);
1415
1416 /*
1417 * If the config information is insufficient (e.g., our IP address or
1418 * IP address of the boot server is missing or we have multiple network
1419 * interfaces and no default was set), use BOOTP or RARP to get the
1420 * missing values.
1421 */
1422 if (ic_myaddr == NONE ||
1423 #ifdef CONFIG_ROOT_NFS
1424 (root_server_addr == NONE &&
1425 ic_servaddr == NONE &&
1426 ROOT_DEV == Root_NFS) ||
1427 #endif
1428 ic_first_dev->next) {
1429 #ifdef IPCONFIG_DYNAMIC
1430 if (ic_dynamic() < 0) {
1431 ic_close_devs();
1432
1433 /*
1434 * I don't know why, but sometimes the
1435 * eepro100 driver (at least) gets upset and
1436 * doesn't work the first time it's opened.
1437 * But then if you close it and reopen it, it
1438 * works just fine. So we need to try that at
1439 * least once before giving up.
1440 *
1441 * Also, if the root will be NFS-mounted, we
1442 * have nowhere to go if DHCP fails. So we
1443 * just have to keep trying forever.
1444 *
1445 * -- Chip
1446 */
1447 #ifdef CONFIG_ROOT_NFS
1448 if (ROOT_DEV == Root_NFS) {
1449 pr_err("IP-Config: Retrying forever (NFS root)...\n");
1450 goto try_try_again;
1451 }
1452 #endif
1453
1454 if (--retries) {
1455 pr_err("IP-Config: Reopening network devices...\n");
1456 goto try_try_again;
1457 }
1458
1459 /* Oh, well. At least we tried. */
1460 pr_err("IP-Config: Auto-configuration of network failed\n");
1461 return -1;
1462 }
1463 #else /* !DYNAMIC */
1464 pr_err("IP-Config: Incomplete network configuration information\n");
1465 ic_close_devs();
1466 return -1;
1467 #endif /* IPCONFIG_DYNAMIC */
1468 } else {
1469 /* Device selected manually or only one device -> use it */
1470 ic_dev = ic_first_dev->dev;
1471 }
1472
1473 addr = root_nfs_parse_addr(root_server_path);
1474 if (root_server_addr == NONE)
1475 root_server_addr = addr;
1476
1477 /*
1478 * Use defaults wherever applicable.
1479 */
1480 if (ic_defaults() < 0)
1481 return -1;
1482
1483 /*
1484 * Close all network devices except the device we've
1485 * autoconfigured and set up routes.
1486 */
1487 ic_close_devs();
1488 if (ic_setup_if() < 0 || ic_setup_routes() < 0)
1489 return -1;
1490
1491 /*
1492 * Record which protocol was actually used.
1493 */
1494 #ifdef IPCONFIG_DYNAMIC
1495 ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP);
1496 #endif
1497
1498 #ifndef IPCONFIG_SILENT
1499 /*
1500 * Clue in the operator.
1501 */
1502 pr_info("IP-Config: Complete:\n");
1503
1504 pr_info(" device=%s, hwaddr=%*phC, ipaddr=%pI4, mask=%pI4, gw=%pI4\n",
1505 ic_dev->name, ic_dev->addr_len, ic_dev->dev_addr,
1506 &ic_myaddr, &ic_netmask, &ic_gateway);
1507 pr_info(" host=%s, domain=%s, nis-domain=%s\n",
1508 utsname()->nodename, ic_domain, utsname()->domainname);
1509 pr_info(" bootserver=%pI4, rootserver=%pI4, rootpath=%s",
1510 &ic_servaddr, &root_server_addr, root_server_path);
1511 if (ic_dev_mtu)
1512 pr_cont(", mtu=%d", ic_dev_mtu);
1513 for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
1514 if (ic_nameservers[i] != NONE) {
1515 pr_info(" nameserver%u=%pI4",
1516 i, &ic_nameservers[i]);
1517 break;
1518 }
1519 for (i++; i < CONF_NAMESERVERS_MAX; i++)
1520 if (ic_nameservers[i] != NONE)
1521 pr_cont(", nameserver%u=%pI4\n", i, &ic_nameservers[i]);
1522 #endif /* !SILENT */
1523
1524 return 0;
1525 }
1526
1527 late_initcall(ip_auto_config);
1528
1529
1530 /*
1531 * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
1532 * command line parameter. See Documentation/filesystems/nfs/nfsroot.txt.
1533 */
1534 static int __init ic_proto_name(char *name)
1535 {
1536 if (!strcmp(name, "on") || !strcmp(name, "any")) {
1537 return 1;
1538 }
1539 if (!strcmp(name, "off") || !strcmp(name, "none")) {
1540 return 0;
1541 }
1542 #ifdef CONFIG_IP_PNP_DHCP
1543 else if (!strcmp(name, "dhcp")) {
1544 ic_proto_enabled &= ~IC_RARP;
1545 return 1;
1546 }
1547 #endif
1548 #ifdef CONFIG_IP_PNP_BOOTP
1549 else if (!strcmp(name, "bootp")) {
1550 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP);
1551 return 1;
1552 }
1553 #endif
1554 #ifdef CONFIG_IP_PNP_RARP
1555 else if (!strcmp(name, "rarp")) {
1556 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP);
1557 return 1;
1558 }
1559 #endif
1560 #ifdef IPCONFIG_DYNAMIC
1561 else if (!strcmp(name, "both")) {
1562 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */
1563 return 1;
1564 }
1565 #endif
1566 return 0;
1567 }
1568
1569 static int __init ip_auto_config_setup(char *addrs)
1570 {
1571 char *cp, *ip, *dp;
1572 int num = 0;
1573
1574 ic_set_manually = 1;
1575 ic_enable = 1;
1576
1577 /*
1578 * If any dhcp, bootp etc options are set, leave autoconfig on
1579 * and skip the below static IP processing.
1580 */
1581 if (ic_proto_name(addrs))
1582 return 1;
1583
1584 /* If no static IP is given, turn off autoconfig and bail. */
1585 if (*addrs == 0 ||
1586 strcmp(addrs, "off") == 0 ||
1587 strcmp(addrs, "none") == 0) {
1588 ic_enable = 0;
1589 return 1;
1590 }
1591
1592 ic_nameservers_predef();
1593
1594 /* Parse string for static IP assignment. */
1595 ip = addrs;
1596 while (ip && *ip) {
1597 if ((cp = strchr(ip, ':')))
1598 *cp++ = '\0';
1599 if (strlen(ip) > 0) {
1600 DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip));
1601 switch (num) {
1602 case 0:
1603 if ((ic_myaddr = in_aton(ip)) == ANY)
1604 ic_myaddr = NONE;
1605 break;
1606 case 1:
1607 if ((ic_servaddr = in_aton(ip)) == ANY)
1608 ic_servaddr = NONE;
1609 break;
1610 case 2:
1611 if ((ic_gateway = in_aton(ip)) == ANY)
1612 ic_gateway = NONE;
1613 break;
1614 case 3:
1615 if ((ic_netmask = in_aton(ip)) == ANY)
1616 ic_netmask = NONE;
1617 break;
1618 case 4:
1619 if ((dp = strchr(ip, '.'))) {
1620 *dp++ = '\0';
1621 strlcpy(utsname()->domainname, dp,
1622 sizeof(utsname()->domainname));
1623 }
1624 strlcpy(utsname()->nodename, ip,
1625 sizeof(utsname()->nodename));
1626 ic_host_name_set = 1;
1627 break;
1628 case 5:
1629 strlcpy(user_dev_name, ip, sizeof(user_dev_name));
1630 break;
1631 case 6:
1632 if (ic_proto_name(ip) == 0 &&
1633 ic_myaddr == NONE) {
1634 ic_enable = 0;
1635 }
1636 break;
1637 case 7:
1638 if (CONF_NAMESERVERS_MAX >= 1) {
1639 ic_nameservers[0] = in_aton(ip);
1640 if (ic_nameservers[0] == ANY)
1641 ic_nameservers[0] = NONE;
1642 }
1643 break;
1644 case 8:
1645 if (CONF_NAMESERVERS_MAX >= 2) {
1646 ic_nameservers[1] = in_aton(ip);
1647 if (ic_nameservers[1] == ANY)
1648 ic_nameservers[1] = NONE;
1649 }
1650 break;
1651 }
1652 }
1653 ip = cp;
1654 num++;
1655 }
1656
1657 return 1;
1658 }
1659 __setup("ip=", ip_auto_config_setup);
1660
1661 static int __init nfsaddrs_config_setup(char *addrs)
1662 {
1663 return ip_auto_config_setup(addrs);
1664 }
1665 __setup("nfsaddrs=", nfsaddrs_config_setup);
1666
1667 static int __init vendor_class_identifier_setup(char *addrs)
1668 {
1669 if (strlcpy(vendor_class_identifier, addrs,
1670 sizeof(vendor_class_identifier))
1671 >= sizeof(vendor_class_identifier))
1672 pr_warn("DHCP: vendorclass too long, truncated to \"%s\"",
1673 vendor_class_identifier);
1674 return 1;
1675 }
1676 __setup("dhcpclass=", vendor_class_identifier_setup);
Linux 2.6 libata-dev (mirror)