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net: remove trailing space in messages
[linux-2.6/libata-dev.git] / net / ipv4 / ipconfig.c
blobbf12d2a7a0c752de937ac68b90f1bc6587ddb094
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 <net/net_namespace.h>
57 #include <net/arp.h>
58 #include <net/ip.h>
59 #include <net/ipconfig.h>
60 #include <net/route.h>
61
62 #include <asm/uaccess.h>
63 #include <net/checksum.h>
64 #include <asm/processor.h>
65
66 /* Define this to allow debugging output */
67 #undef IPCONFIG_DEBUG
68
69 #ifdef IPCONFIG_DEBUG
70 #define DBG(x) printk x
71 #else
72 #define DBG(x) do { } while(0)
73 #endif
74
75 #if defined(CONFIG_IP_PNP_DHCP)
76 #define IPCONFIG_DHCP
77 #endif
78 #if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_DHCP)
79 #define IPCONFIG_BOOTP
80 #endif
81 #if defined(CONFIG_IP_PNP_RARP)
82 #define IPCONFIG_RARP
83 #endif
84 #if defined(IPCONFIG_BOOTP) || defined(IPCONFIG_RARP)
85 #define IPCONFIG_DYNAMIC
86 #endif
87
88 /* Define the friendly delay before and after opening net devices */
89 #define CONF_PRE_OPEN 500 /* Before opening: 1/2 second */
90 #define CONF_POST_OPEN 1 /* After opening: 1 second */
91
92 /* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */
93 #define CONF_OPEN_RETRIES 2 /* (Re)open devices twice */
94 #define CONF_SEND_RETRIES 6 /* Send six requests per open */
95 #define CONF_INTER_TIMEOUT (HZ/2) /* Inter-device timeout: 1/2 second */
96 #define CONF_BASE_TIMEOUT (HZ*2) /* Initial timeout: 2 seconds */
97 #define CONF_TIMEOUT_RANDOM (HZ) /* Maximum amount of randomization */
98 #define CONF_TIMEOUT_MULT *7/4 /* Rate of timeout growth */
99 #define CONF_TIMEOUT_MAX (HZ*30) /* Maximum allowed timeout */
100 #define CONF_NAMESERVERS_MAX 3 /* Maximum number of nameservers
101 - '3' from resolv.h */
102
103 #define NONE cpu_to_be32(INADDR_NONE)
104 #define ANY cpu_to_be32(INADDR_ANY)
105
106 /*
107 * Public IP configuration
108 */
109
110 /* This is used by platforms which might be able to set the ipconfig
111 * variables using firmware environment vars. If this is set, it will
112 * ignore such firmware variables.
113 */
114 int ic_set_manually __initdata = 0; /* IPconfig parameters set manually */
115
116 static int ic_enable __initdata = 0; /* IP config enabled? */
117
118 /* Protocol choice */
119 int ic_proto_enabled __initdata = 0
120 #ifdef IPCONFIG_BOOTP
121 | IC_BOOTP
122 #endif
123 #ifdef CONFIG_IP_PNP_DHCP
124 | IC_USE_DHCP
125 #endif
126 #ifdef IPCONFIG_RARP
127 | IC_RARP
128 #endif
129 ;
130
131 static int ic_host_name_set __initdata = 0; /* Host name set by us? */
132
133 __be32 ic_myaddr = NONE; /* My IP address */
134 static __be32 ic_netmask = NONE; /* Netmask for local subnet */
135 __be32 ic_gateway = NONE; /* Gateway IP address */
136
137 __be32 ic_servaddr = NONE; /* Boot server IP address */
138
139 __be32 root_server_addr = NONE; /* Address of NFS server */
140 u8 root_server_path[256] = { 0, }; /* Path to mount as root */
141
142 u32 ic_dev_xid; /* Device under configuration */
143
144 /* vendor class identifier */
145 static char vendor_class_identifier[253] __initdata;
146
147 /* Persistent data: */
148
149 static int ic_proto_used; /* Protocol used, if any */
150 static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */
151 static u8 ic_domain[64]; /* DNS (not NIS) domain name */
152
153 /*
154 * Private state.
155 */
156
157 /* Name of user-selected boot device */
158 static char user_dev_name[IFNAMSIZ] __initdata = { 0, };
159
160 /* Protocols supported by available interfaces */
161 static int ic_proto_have_if __initdata = 0;
162
163 /* MTU for boot device */
164 static int ic_dev_mtu __initdata = 0;
165
166 #ifdef IPCONFIG_DYNAMIC
167 static DEFINE_SPINLOCK(ic_recv_lock);
168 static volatile int ic_got_reply __initdata = 0; /* Proto(s) that replied */
169 #endif
170 #ifdef IPCONFIG_DHCP
171 static int ic_dhcp_msgtype __initdata = 0; /* DHCP msg type received */
172 #endif
173
174
175 /*
176 * Network devices
177 */
178
179 struct ic_device {
180 struct ic_device *next;
181 struct net_device *dev;
182 unsigned short flags;
183 short able;
184 __be32 xid;
185 };
186
187 static struct ic_device *ic_first_dev __initdata = NULL;/* List of open device */
188 static struct net_device *ic_dev __initdata = NULL; /* Selected device */
189
190 static bool __init ic_device_match(struct net_device *dev)
191 {
192 if (user_dev_name[0] ? !strcmp(dev->name, user_dev_name) :
193 (!(dev->flags & IFF_LOOPBACK) &&
194 (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) &&
195 strncmp(dev->name, "dummy", 5)))
196 return true;
197 return false;
198 }
199
200 static int __init ic_open_devs(void)
201 {
202 struct ic_device *d, **last;
203 struct net_device *dev;
204 unsigned short oflags;
205
206 last = &ic_first_dev;
207 rtnl_lock();
208
209 /* bring loopback device up first */
210 for_each_netdev(&init_net, dev) {
211 if (!(dev->flags & IFF_LOOPBACK))
212 continue;
213 if (dev_change_flags(dev, dev->flags | IFF_UP) < 0)
214 printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name);
215 }
216
217 for_each_netdev(&init_net, dev) {
218 if (dev->flags & IFF_LOOPBACK)
219 continue;
220 if (ic_device_match(dev)) {
221 int able = 0;
222 if (dev->mtu >= 364)
223 able |= IC_BOOTP;
224 else
225 printk(KERN_WARNING "DHCP/BOOTP: Ignoring device %s, MTU %d too small", dev->name, dev->mtu);
226 if (!(dev->flags & IFF_NOARP))
227 able |= IC_RARP;
228 able &= ic_proto_enabled;
229 if (ic_proto_enabled && !able)
230 continue;
231 oflags = dev->flags;
232 if (dev_change_flags(dev, oflags | IFF_UP) < 0) {
233 printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name);
234 continue;
235 }
236 if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) {
237 rtnl_unlock();
238 return -ENOMEM;
239 }
240 d->dev = dev;
241 *last = d;
242 last = &d->next;
243 d->flags = oflags;
244 d->able = able;
245 if (able & IC_BOOTP)
246 get_random_bytes(&d->xid, sizeof(__be32));
247 else
248 d->xid = 0;
249 ic_proto_have_if |= able;
250 DBG(("IP-Config: %s UP (able=%d, xid=%08x)\n",
251 dev->name, able, d->xid));
252 }
253 }
254 rtnl_unlock();
255
256 *last = NULL;
257
258 if (!ic_first_dev) {
259 if (user_dev_name[0])
260 printk(KERN_ERR "IP-Config: Device `%s' not found.\n", user_dev_name);
261 else
262 printk(KERN_ERR "IP-Config: No network devices available.\n");
263 return -ENODEV;
264 }
265 return 0;
266 }
267
268 static void __init ic_close_devs(void)
269 {
270 struct ic_device *d, *next;
271 struct net_device *dev;
272
273 rtnl_lock();
274 next = ic_first_dev;
275 while ((d = next)) {
276 next = d->next;
277 dev = d->dev;
278 if (dev != ic_dev) {
279 DBG(("IP-Config: Downing %s\n", dev->name));
280 dev_change_flags(dev, d->flags);
281 }
282 kfree(d);
283 }
284 rtnl_unlock();
285 }
286
287 /*
288 * Interface to various network functions.
289 */
290
291 static inline void
292 set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port)
293 {
294 sin->sin_family = AF_INET;
295 sin->sin_addr.s_addr = addr;
296 sin->sin_port = port;
297 }
298
299 static int __init ic_devinet_ioctl(unsigned int cmd, struct ifreq *arg)
300 {
301 int res;
302
303 mm_segment_t oldfs = get_fs();
304 set_fs(get_ds());
305 res = devinet_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
306 set_fs(oldfs);
307 return res;
308 }
309
310 static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg)
311 {
312 int res;
313
314 mm_segment_t oldfs = get_fs();
315 set_fs(get_ds());
316 res = dev_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
317 set_fs(oldfs);
318 return res;
319 }
320
321 static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg)
322 {
323 int res;
324
325 mm_segment_t oldfs = get_fs();
326 set_fs(get_ds());
327 res = ip_rt_ioctl(&init_net, cmd, (void __user *) arg);
328 set_fs(oldfs);
329 return res;
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->name);
344 set_sockaddr(sin, ic_myaddr, 0);
345 if ((err = ic_devinet_ioctl(SIOCSIFADDR, &ir)) < 0) {
346 printk(KERN_ERR "IP-Config: Unable to set interface address (%d).\n", err);
347 return -1;
348 }
349 set_sockaddr(sin, ic_netmask, 0);
350 if ((err = ic_devinet_ioctl(SIOCSIFNETMASK, &ir)) < 0) {
351 printk(KERN_ERR "IP-Config: Unable to set interface netmask (%d).\n", err);
352 return -1;
353 }
354 set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0);
355 if ((err = ic_devinet_ioctl(SIOCSIFBRDADDR, &ir)) < 0) {
356 printk(KERN_ERR "IP-Config: Unable to set interface broadcast address (%d).\n", err);
357 return -1;
358 }
359 /* Handle the case where we need non-standard MTU on the boot link (a network
360 * using jumbo frames, for instance). If we can't set the mtu, don't error
361 * out, we'll try to muddle along.
362 */
363 if (ic_dev_mtu != 0) {
364 strcpy(ir.ifr_name, ic_dev->name);
365 ir.ifr_mtu = ic_dev_mtu;
366 if ((err = ic_dev_ioctl(SIOCSIFMTU, &ir)) < 0)
367 printk(KERN_ERR "IP-Config: Unable to set interface mtu to %d (%d).\n",
368 ic_dev_mtu, err);
369 }
370 return 0;
371 }
372
373 static int __init ic_setup_routes(void)
374 {
375 /* No need to setup device routes, only the default route... */
376
377 if (ic_gateway != NONE) {
378 struct rtentry rm;
379 int err;
380
381 memset(&rm, 0, sizeof(rm));
382 if ((ic_gateway ^ ic_myaddr) & ic_netmask) {
383 printk(KERN_ERR "IP-Config: Gateway not on directly connected network.\n");
384 return -1;
385 }
386 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0);
387 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0);
388 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0);
389 rm.rt_flags = RTF_UP | RTF_GATEWAY;
390 if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) {
391 printk(KERN_ERR "IP-Config: Cannot add default route (%d).\n", err);
392 return -1;
393 }
394 }
395
396 return 0;
397 }
398
399 /*
400 * Fill in default values for all missing parameters.
401 */
402
403 static int __init ic_defaults(void)
404 {
405 /*
406 * At this point we have no userspace running so need not
407 * claim locks on system_utsname
408 */
409
410 if (!ic_host_name_set)
411 sprintf(init_utsname()->nodename, "%pI4", &ic_myaddr);
412
413 if (root_server_addr == NONE)
414 root_server_addr = ic_servaddr;
415
416 if (ic_netmask == NONE) {
417 if (IN_CLASSA(ntohl(ic_myaddr)))
418 ic_netmask = htonl(IN_CLASSA_NET);
419 else if (IN_CLASSB(ntohl(ic_myaddr)))
420 ic_netmask = htonl(IN_CLASSB_NET);
421 else if (IN_CLASSC(ntohl(ic_myaddr)))
422 ic_netmask = htonl(IN_CLASSC_NET);
423 else {
424 printk(KERN_ERR "IP-Config: Unable to guess netmask for address %pI4\n",
425 &ic_myaddr);
426 return -1;
427 }
428 printk("IP-Config: Guessing netmask %pI4\n", &ic_netmask);
429 }
430
431 return 0;
432 }
433
434 /*
435 * RARP support.
436 */
437
438 #ifdef IPCONFIG_RARP
439
440 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
441
442 static struct packet_type rarp_packet_type __initdata = {
443 .type = cpu_to_be16(ETH_P_RARP),
444 .func = ic_rarp_recv,
445 };
446
447 static inline void __init ic_rarp_init(void)
448 {
449 dev_add_pack(&rarp_packet_type);
450 }
451
452 static inline void __init ic_rarp_cleanup(void)
453 {
454 dev_remove_pack(&rarp_packet_type);
455 }
456
457 /*
458 * Process received RARP packet.
459 */
460 static int __init
461 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
462 {
463 struct arphdr *rarp;
464 unsigned char *rarp_ptr;
465 __be32 sip, tip;
466 unsigned char *sha, *tha; /* s for "source", t for "target" */
467 struct ic_device *d;
468
469 if (!net_eq(dev_net(dev), &init_net))
470 goto drop;
471
472 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
473 return NET_RX_DROP;
474
475 if (!pskb_may_pull(skb, sizeof(struct arphdr)))
476 goto drop;
477
478 /* Basic sanity checks can be done without the lock. */
479 rarp = (struct arphdr *)skb_transport_header(skb);
480
481 /* If this test doesn't pass, it's not IP, or we should
482 * ignore it anyway.
483 */
484 if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd))
485 goto drop;
486
487 /* If it's not a RARP reply, delete it. */
488 if (rarp->ar_op != htons(ARPOP_RREPLY))
489 goto drop;
490
491 /* If it's not Ethernet, delete it. */
492 if (rarp->ar_pro != htons(ETH_P_IP))
493 goto drop;
494
495 if (!pskb_may_pull(skb, arp_hdr_len(dev)))
496 goto drop;
497
498 /* OK, it is all there and looks valid, process... */
499 rarp = (struct arphdr *)skb_transport_header(skb);
500 rarp_ptr = (unsigned char *) (rarp + 1);
501
502 /* One reply at a time, please. */
503 spin_lock(&ic_recv_lock);
504
505 /* If we already have a reply, just drop the packet */
506 if (ic_got_reply)
507 goto drop_unlock;
508
509 /* Find the ic_device that the packet arrived on */
510 d = ic_first_dev;
511 while (d && d->dev != dev)
512 d = d->next;
513 if (!d)
514 goto drop_unlock; /* should never happen */
515
516 /* Extract variable-width fields */
517 sha = rarp_ptr;
518 rarp_ptr += dev->addr_len;
519 memcpy(&sip, rarp_ptr, 4);
520 rarp_ptr += 4;
521 tha = rarp_ptr;
522 rarp_ptr += dev->addr_len;
523 memcpy(&tip, rarp_ptr, 4);
524
525 /* Discard packets which are not meant for us. */
526 if (memcmp(tha, dev->dev_addr, dev->addr_len))
527 goto drop_unlock;
528
529 /* Discard packets which are not from specified server. */
530 if (ic_servaddr != NONE && ic_servaddr != sip)
531 goto drop_unlock;
532
533 /* We have a winner! */
534 ic_dev = dev;
535 if (ic_myaddr == NONE)
536 ic_myaddr = tip;
537 ic_servaddr = sip;
538 ic_got_reply = IC_RARP;
539
540 drop_unlock:
541 /* Show's over. Nothing to see here. */
542 spin_unlock(&ic_recv_lock);
543
544 drop:
545 /* Throw the packet out. */
546 kfree_skb(skb);
547 return 0;
548 }
549
550
551 /*
552 * Send RARP request packet over a single interface.
553 */
554 static void __init ic_rarp_send_if(struct ic_device *d)
555 {
556 struct net_device *dev = d->dev;
557 arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL,
558 dev->dev_addr, dev->dev_addr);
559 }
560 #endif
561
562 /*
563 * DHCP/BOOTP support.
564 */
565
566 #ifdef IPCONFIG_BOOTP
567
568 struct bootp_pkt { /* BOOTP packet format */
569 struct iphdr iph; /* IP header */
570 struct udphdr udph; /* UDP header */
571 u8 op; /* 1=request, 2=reply */
572 u8 htype; /* HW address type */
573 u8 hlen; /* HW address length */
574 u8 hops; /* Used only by gateways */
575 __be32 xid; /* Transaction ID */
576 __be16 secs; /* Seconds since we started */
577 __be16 flags; /* Just what it says */
578 __be32 client_ip; /* Client's IP address if known */
579 __be32 your_ip; /* Assigned IP address */
580 __be32 server_ip; /* (Next, e.g. NFS) Server's IP address */
581 __be32 relay_ip; /* IP address of BOOTP relay */
582 u8 hw_addr[16]; /* Client's HW address */
583 u8 serv_name[64]; /* Server host name */
584 u8 boot_file[128]; /* Name of boot file */
585 u8 exten[312]; /* DHCP options / BOOTP vendor extensions */
586 };
587
588 /* packet ops */
589 #define BOOTP_REQUEST 1
590 #define BOOTP_REPLY 2
591
592 /* DHCP message types */
593 #define DHCPDISCOVER 1
594 #define DHCPOFFER 2
595 #define DHCPREQUEST 3
596 #define DHCPDECLINE 4
597 #define DHCPACK 5
598 #define DHCPNAK 6
599 #define DHCPRELEASE 7
600 #define DHCPINFORM 8
601
602 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
603
604 static struct packet_type bootp_packet_type __initdata = {
605 .type = cpu_to_be16(ETH_P_IP),
606 .func = ic_bootp_recv,
607 };
608
609
610 /*
611 * Initialize DHCP/BOOTP extension fields in the request.
612 */
613
614 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 };
615
616 #ifdef IPCONFIG_DHCP
617
618 static void __init
619 ic_dhcp_init_options(u8 *options)
620 {
621 u8 mt = ((ic_servaddr == NONE)
622 ? DHCPDISCOVER : DHCPREQUEST);
623 u8 *e = options;
624 int len;
625
626 #ifdef IPCONFIG_DEBUG
627 printk("DHCP: Sending message type %d\n", mt);
628 #endif
629
630 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */
631 e += 4;
632
633 *e++ = 53; /* DHCP message type */
634 *e++ = 1;
635 *e++ = mt;
636
637 if (mt == DHCPREQUEST) {
638 *e++ = 54; /* Server ID (IP address) */
639 *e++ = 4;
640 memcpy(e, &ic_servaddr, 4);
641 e += 4;
642
643 *e++ = 50; /* Requested IP address */
644 *e++ = 4;
645 memcpy(e, &ic_myaddr, 4);
646 e += 4;
647 }
648
649 /* always? */
650 {
651 static const u8 ic_req_params[] = {
652 1, /* Subnet mask */
653 3, /* Default gateway */
654 6, /* DNS server */
655 12, /* Host name */
656 15, /* Domain name */
657 17, /* Boot path */
658 26, /* MTU */
659 40, /* NIS domain name */
660 };
661
662 *e++ = 55; /* Parameter request list */
663 *e++ = sizeof(ic_req_params);
664 memcpy(e, ic_req_params, sizeof(ic_req_params));
665 e += sizeof(ic_req_params);
666
667 if (*vendor_class_identifier) {
668 printk(KERN_INFO "DHCP: sending class identifier \"%s\"\n",
669 vendor_class_identifier);
670 *e++ = 60; /* Class-identifier */
671 len = strlen(vendor_class_identifier);
672 *e++ = len;
673 memcpy(e, vendor_class_identifier, len);
674 e += len;
675 }
676 }
677
678 *e++ = 255; /* End of the list */
679 }
680
681 #endif /* IPCONFIG_DHCP */
682
683 static void __init ic_bootp_init_ext(u8 *e)
684 {
685 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */
686 e += 4;
687 *e++ = 1; /* Subnet mask request */
688 *e++ = 4;
689 e += 4;
690 *e++ = 3; /* Default gateway request */
691 *e++ = 4;
692 e += 4;
693 *e++ = 5; /* Name server request */
694 *e++ = 8;
695 e += 8;
696 *e++ = 12; /* Host name request */
697 *e++ = 32;
698 e += 32;
699 *e++ = 40; /* NIS Domain name request */
700 *e++ = 32;
701 e += 32;
702 *e++ = 17; /* Boot path */
703 *e++ = 40;
704 e += 40;
705
706 *e++ = 57; /* set extension buffer size for reply */
707 *e++ = 2;
708 *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */
709 *e++ = 150;
710
711 *e++ = 255; /* End of the list */
712 }
713
714
715 /*
716 * Initialize the DHCP/BOOTP mechanism.
717 */
718 static inline void __init ic_bootp_init(void)
719 {
720 int i;
721
722 for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
723 ic_nameservers[i] = NONE;
724
725 dev_add_pack(&bootp_packet_type);
726 }
727
728
729 /*
730 * DHCP/BOOTP cleanup.
731 */
732 static inline void __init ic_bootp_cleanup(void)
733 {
734 dev_remove_pack(&bootp_packet_type);
735 }
736
737
738 /*
739 * Send DHCP/BOOTP request to single interface.
740 */
741 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff)
742 {
743 struct net_device *dev = d->dev;
744 struct sk_buff *skb;
745 struct bootp_pkt *b;
746 struct iphdr *h;
747
748 /* Allocate packet */
749 skb = alloc_skb(sizeof(struct bootp_pkt) + LL_ALLOCATED_SPACE(dev) + 15,
750 GFP_KERNEL);
751 if (!skb)
752 return;
753 skb_reserve(skb, LL_RESERVED_SPACE(dev));
754 b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt));
755 memset(b, 0, sizeof(struct bootp_pkt));
756
757 /* Construct IP header */
758 skb_reset_network_header(skb);
759 h = ip_hdr(skb);
760 h->version = 4;
761 h->ihl = 5;
762 h->tot_len = htons(sizeof(struct bootp_pkt));
763 h->frag_off = htons(IP_DF);
764 h->ttl = 64;
765 h->protocol = IPPROTO_UDP;
766 h->daddr = htonl(INADDR_BROADCAST);
767 h->check = ip_fast_csum((unsigned char *) h, h->ihl);
768
769 /* Construct UDP header */
770 b->udph.source = htons(68);
771 b->udph.dest = htons(67);
772 b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr));
773 /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */
774
775 /* Construct DHCP/BOOTP header */
776 b->op = BOOTP_REQUEST;
777 if (dev->type < 256) /* check for false types */
778 b->htype = dev->type;
779 else if (dev->type == ARPHRD_IEEE802_TR) /* fix for token ring */
780 b->htype = ARPHRD_IEEE802;
781 else if (dev->type == ARPHRD_FDDI)
782 b->htype = ARPHRD_ETHER;
783 else {
784 printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name);
785 b->htype = dev->type; /* can cause undefined behavior */
786 }
787
788 /* server_ip and your_ip address are both already zero per RFC2131 */
789 b->hlen = dev->addr_len;
790 memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
791 b->secs = htons(jiffies_diff / HZ);
792 b->xid = d->xid;
793
794 /* add DHCP options or BOOTP extensions */
795 #ifdef IPCONFIG_DHCP
796 if (ic_proto_enabled & IC_USE_DHCP)
797 ic_dhcp_init_options(b->exten);
798 else
799 #endif
800 ic_bootp_init_ext(b->exten);
801
802 /* Chain packet down the line... */
803 skb->dev = dev;
804 skb->protocol = htons(ETH_P_IP);
805 if (dev_hard_header(skb, dev, ntohs(skb->protocol),
806 dev->broadcast, dev->dev_addr, skb->len) < 0 ||
807 dev_queue_xmit(skb) < 0)
808 printk("E");
809 }
810
811
812 /*
813 * Copy BOOTP-supplied string if not already set.
814 */
815 static int __init ic_bootp_string(char *dest, char *src, int len, int max)
816 {
817 if (!len)
818 return 0;
819 if (len > max-1)
820 len = max-1;
821 memcpy(dest, src, len);
822 dest[len] = '\0';
823 return 1;
824 }
825
826
827 /*
828 * Process BOOTP extensions.
829 */
830 static void __init ic_do_bootp_ext(u8 *ext)
831 {
832 u8 servers;
833 int i;
834 u16 mtu;
835
836 #ifdef IPCONFIG_DEBUG
837 u8 *c;
838
839 printk("DHCP/BOOTP: Got extension %d:",*ext);
840 for (c=ext+2; c<ext+2+ext[1]; c++)
841 printk(" %02x", *c);
842 printk("\n");
843 #endif
844
845 switch (*ext++) {
846 case 1: /* Subnet mask */
847 if (ic_netmask == NONE)
848 memcpy(&ic_netmask, ext+1, 4);
849 break;
850 case 3: /* Default gateway */
851 if (ic_gateway == NONE)
852 memcpy(&ic_gateway, ext+1, 4);
853 break;
854 case 6: /* DNS server */
855 servers= *ext/4;
856 if (servers > CONF_NAMESERVERS_MAX)
857 servers = CONF_NAMESERVERS_MAX;
858 for (i = 0; i < servers; i++) {
859 if (ic_nameservers[i] == NONE)
860 memcpy(&ic_nameservers[i], ext+1+4*i, 4);
861 }
862 break;
863 case 12: /* Host name */
864 ic_bootp_string(utsname()->nodename, ext+1, *ext, __NEW_UTS_LEN);
865 ic_host_name_set = 1;
866 break;
867 case 15: /* Domain name (DNS) */
868 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
869 break;
870 case 17: /* Root path */
871 if (!root_server_path[0])
872 ic_bootp_string(root_server_path, ext+1, *ext, sizeof(root_server_path));
873 break;
874 case 26: /* Interface MTU */
875 memcpy(&mtu, ext+1, sizeof(mtu));
876 ic_dev_mtu = ntohs(mtu);
877 break;
878 case 40: /* NIS Domain name (_not_ DNS) */
879 ic_bootp_string(utsname()->domainname, ext+1, *ext, __NEW_UTS_LEN);
880 break;
881 }
882 }
883
884
885 /*
886 * Receive BOOTP reply.
887 */
888 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
889 {
890 struct bootp_pkt *b;
891 struct iphdr *h;
892 struct ic_device *d;
893 int len, ext_len;
894
895 if (!net_eq(dev_net(dev), &init_net))
896 goto drop;
897
898 /* Perform verifications before taking the lock. */
899 if (skb->pkt_type == PACKET_OTHERHOST)
900 goto drop;
901
902 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
903 return NET_RX_DROP;
904
905 if (!pskb_may_pull(skb,
906 sizeof(struct iphdr) +
907 sizeof(struct udphdr)))
908 goto drop;
909
910 b = (struct bootp_pkt *)skb_network_header(skb);
911 h = &b->iph;
912
913 if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP)
914 goto drop;
915
916 /* Fragments are not supported */
917 if (h->frag_off & htons(IP_OFFSET | IP_MF)) {
918 if (net_ratelimit())
919 printk(KERN_ERR "DHCP/BOOTP: Ignoring fragmented "
920 "reply.\n");
921 goto drop;
922 }
923
924 if (skb->len < ntohs(h->tot_len))
925 goto drop;
926
927 if (ip_fast_csum((char *) h, h->ihl))
928 goto drop;
929
930 if (b->udph.source != htons(67) || b->udph.dest != htons(68))
931 goto drop;
932
933 if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
934 goto drop;
935
936 len = ntohs(b->udph.len) - sizeof(struct udphdr);
937 ext_len = len - (sizeof(*b) -
938 sizeof(struct iphdr) -
939 sizeof(struct udphdr) -
940 sizeof(b->exten));
941 if (ext_len < 0)
942 goto drop;
943
944 /* Ok the front looks good, make sure we can get at the rest. */
945 if (!pskb_may_pull(skb, skb->len))
946 goto drop;
947
948 b = (struct bootp_pkt *)skb_network_header(skb);
949 h = &b->iph;
950
951 /* One reply at a time, please. */
952 spin_lock(&ic_recv_lock);
953
954 /* If we already have a reply, just drop the packet */
955 if (ic_got_reply)
956 goto drop_unlock;
957
958 /* Find the ic_device that the packet arrived on */
959 d = ic_first_dev;
960 while (d && d->dev != dev)
961 d = d->next;
962 if (!d)
963 goto drop_unlock; /* should never happen */
964
965 /* Is it a reply to our BOOTP request? */
966 if (b->op != BOOTP_REPLY ||
967 b->xid != d->xid) {
968 if (net_ratelimit())
969 printk(KERN_ERR "DHCP/BOOTP: Reply not for us, "
970 "op[%x] xid[%x]\n",
971 b->op, b->xid);
972 goto drop_unlock;
973 }
974
975 /* Is it a reply for the device we are configuring? */
976 if (b->xid != ic_dev_xid) {
977 if (net_ratelimit())
978 printk(KERN_ERR "DHCP/BOOTP: Ignoring delayed packet\n");
979 goto drop_unlock;
980 }
981
982 /* Parse extensions */
983 if (ext_len >= 4 &&
984 !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */
985 u8 *end = (u8 *) b + ntohs(b->iph.tot_len);
986 u8 *ext;
987
988 #ifdef IPCONFIG_DHCP
989 if (ic_proto_enabled & IC_USE_DHCP) {
990 __be32 server_id = NONE;
991 int mt = 0;
992
993 ext = &b->exten[4];
994 while (ext < end && *ext != 0xff) {
995 u8 *opt = ext++;
996 if (*opt == 0) /* Padding */
997 continue;
998 ext += *ext + 1;
999 if (ext >= end)
1000 break;
1001 switch (*opt) {
1002 case 53: /* Message type */
1003 if (opt[1])
1004 mt = opt[2];
1005 break;
1006 case 54: /* Server ID (IP address) */
1007 if (opt[1] >= 4)
1008 memcpy(&server_id, opt + 2, 4);
1009 break;
1010 }
1011 }
1012
1013 #ifdef IPCONFIG_DEBUG
1014 printk("DHCP: Got message type %d\n", mt);
1015 #endif
1016
1017 switch (mt) {
1018 case DHCPOFFER:
1019 /* While in the process of accepting one offer,
1020 * ignore all others.
1021 */
1022 if (ic_myaddr != NONE)
1023 goto drop_unlock;
1024
1025 /* Let's accept that offer. */
1026 ic_myaddr = b->your_ip;
1027 ic_servaddr = server_id;
1028 #ifdef IPCONFIG_DEBUG
1029 printk("DHCP: Offered address %pI4 by server %pI4\n",
1030 &ic_myaddr, &ic_servaddr);
1031 #endif
1032 /* The DHCP indicated server address takes
1033 * precedence over the bootp header one if
1034 * they are different.
1035 */
1036 if ((server_id != NONE) &&
1037 (b->server_ip != server_id))
1038 b->server_ip = ic_servaddr;
1039 break;
1040
1041 case DHCPACK:
1042 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0)
1043 goto drop_unlock;
1044
1045 /* Yeah! */
1046 break;
1047
1048 default:
1049 /* Urque. Forget it*/
1050 ic_myaddr = NONE;
1051 ic_servaddr = NONE;
1052 goto drop_unlock;
1053 }
1054
1055 ic_dhcp_msgtype = mt;
1056
1057 }
1058 #endif /* IPCONFIG_DHCP */
1059
1060 ext = &b->exten[4];
1061 while (ext < end && *ext != 0xff) {
1062 u8 *opt = ext++;
1063 if (*opt == 0) /* Padding */
1064 continue;
1065 ext += *ext + 1;
1066 if (ext < end)
1067 ic_do_bootp_ext(opt);
1068 }
1069 }
1070
1071 /* We have a winner! */
1072 ic_dev = dev;
1073 ic_myaddr = b->your_ip;
1074 ic_servaddr = b->server_ip;
1075 if (ic_gateway == NONE && b->relay_ip)
1076 ic_gateway = b->relay_ip;
1077 if (ic_nameservers[0] == NONE)
1078 ic_nameservers[0] = ic_servaddr;
1079 ic_got_reply = IC_BOOTP;
1080
1081 drop_unlock:
1082 /* Show's over. Nothing to see here. */
1083 spin_unlock(&ic_recv_lock);
1084
1085 drop:
1086 /* Throw the packet out. */
1087 kfree_skb(skb);
1088
1089 return 0;
1090 }
1091
1092
1093 #endif
1094
1095
1096 /*
1097 * Dynamic IP configuration -- DHCP, BOOTP, RARP.
1098 */
1099
1100 #ifdef IPCONFIG_DYNAMIC
1101
1102 static int __init ic_dynamic(void)
1103 {
1104 int retries;
1105 struct ic_device *d;
1106 unsigned long start_jiffies, timeout, jiff;
1107 int do_bootp = ic_proto_have_if & IC_BOOTP;
1108 int do_rarp = ic_proto_have_if & IC_RARP;
1109
1110 /*
1111 * If none of DHCP/BOOTP/RARP was selected, return with an error.
1112 * This routine gets only called when some pieces of information
1113 * are missing, and without DHCP/BOOTP/RARP we are unable to get it.
1114 */
1115 if (!ic_proto_enabled) {
1116 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
1117 return -1;
1118 }
1119
1120 #ifdef IPCONFIG_BOOTP
1121 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
1122 printk(KERN_ERR "DHCP/BOOTP: No suitable device found.\n");
1123 #endif
1124 #ifdef IPCONFIG_RARP
1125 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)
1126 printk(KERN_ERR "RARP: No suitable device found.\n");
1127 #endif
1128
1129 if (!ic_proto_have_if)
1130 /* Error message already printed */
1131 return -1;
1132
1133 /*
1134 * Setup protocols
1135 */
1136 #ifdef IPCONFIG_BOOTP
1137 if (do_bootp)
1138 ic_bootp_init();
1139 #endif
1140 #ifdef IPCONFIG_RARP
1141 if (do_rarp)
1142 ic_rarp_init();
1143 #endif
1144
1145 /*
1146 * Send requests and wait, until we get an answer. This loop
1147 * seems to be a terrible waste of CPU time, but actually there is
1148 * only one process running at all, so we don't need to use any
1149 * scheduler functions.
1150 * [Actually we could now, but the nothing else running note still
1151 * applies.. - AC]
1152 */
1153 printk(KERN_NOTICE "Sending %s%s%s requests .",
1154 do_bootp
1155 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "",
1156 (do_bootp && do_rarp) ? " and " : "",
1157 do_rarp ? "RARP" : "");
1158
1159 start_jiffies = jiffies;
1160 d = ic_first_dev;
1161 retries = CONF_SEND_RETRIES;
1162 get_random_bytes(&timeout, sizeof(timeout));
1163 timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned) CONF_TIMEOUT_RANDOM);
1164 for (;;) {
1165 /* Track the device we are configuring */
1166 ic_dev_xid = d->xid;
1167
1168 #ifdef IPCONFIG_BOOTP
1169 if (do_bootp && (d->able & IC_BOOTP))
1170 ic_bootp_send_if(d, jiffies - start_jiffies);
1171 #endif
1172 #ifdef IPCONFIG_RARP
1173 if (do_rarp && (d->able & IC_RARP))
1174 ic_rarp_send_if(d);
1175 #endif
1176
1177 jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout);
1178 while (time_before(jiffies, jiff) && !ic_got_reply)
1179 schedule_timeout_uninterruptible(1);
1180 #ifdef IPCONFIG_DHCP
1181 /* DHCP isn't done until we get a DHCPACK. */
1182 if ((ic_got_reply & IC_BOOTP) &&
1183 (ic_proto_enabled & IC_USE_DHCP) &&
1184 ic_dhcp_msgtype != DHCPACK) {
1185 ic_got_reply = 0;
1186 printk(",");
1187 continue;
1188 }
1189 #endif /* IPCONFIG_DHCP */
1190
1191 if (ic_got_reply) {
1192 printk(" OK\n");
1193 break;
1194 }
1195
1196 if ((d = d->next))
1197 continue;
1198
1199 if (! --retries) {
1200 printk(" timed out!\n");
1201 break;
1202 }
1203
1204 d = ic_first_dev;
1205
1206 timeout = timeout CONF_TIMEOUT_MULT;
1207 if (timeout > CONF_TIMEOUT_MAX)
1208 timeout = CONF_TIMEOUT_MAX;
1209
1210 printk(".");
1211 }
1212
1213 #ifdef IPCONFIG_BOOTP
1214 if (do_bootp)
1215 ic_bootp_cleanup();
1216 #endif
1217 #ifdef IPCONFIG_RARP
1218 if (do_rarp)
1219 ic_rarp_cleanup();
1220 #endif
1221
1222 if (!ic_got_reply) {
1223 ic_myaddr = NONE;
1224 return -1;
1225 }
1226
1227 printk("IP-Config: Got %s answer from %pI4, ",
1228 ((ic_got_reply & IC_RARP) ? "RARP"
1229 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),
1230 &ic_servaddr);
1231 printk("my address is %pI4\n", &ic_myaddr);
1232
1233 return 0;
1234 }
1235
1236 #endif /* IPCONFIG_DYNAMIC */
1237
1238 #ifdef CONFIG_PROC_FS
1239
1240 static int pnp_seq_show(struct seq_file *seq, void *v)
1241 {
1242 int i;
1243
1244 if (ic_proto_used & IC_PROTO)
1245 seq_printf(seq, "#PROTO: %s\n",
1246 (ic_proto_used & IC_RARP) ? "RARP"
1247 : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP");
1248 else
1249 seq_puts(seq, "#MANUAL\n");
1250
1251 if (ic_domain[0])
1252 seq_printf(seq,
1253 "domain %s\n", ic_domain);
1254 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {
1255 if (ic_nameservers[i] != NONE)
1256 seq_printf(seq, "nameserver %pI4\n",
1257 &ic_nameservers[i]);
1258 }
1259 if (ic_servaddr != NONE)
1260 seq_printf(seq, "bootserver %pI4\n",
1261 &ic_servaddr);
1262 return 0;
1263 }
1264
1265 static int pnp_seq_open(struct inode *indoe, struct file *file)
1266 {
1267 return single_open(file, pnp_seq_show, NULL);
1268 }
1269
1270 static const struct file_operations pnp_seq_fops = {
1271 .owner = THIS_MODULE,
1272 .open = pnp_seq_open,
1273 .read = seq_read,
1274 .llseek = seq_lseek,
1275 .release = single_release,
1276 };
1277 #endif /* CONFIG_PROC_FS */
1278
1279 /*
1280 * Extract IP address from the parameter string if needed. Note that we
1281 * need to have root_server_addr set _before_ IPConfig gets called as it
1282 * can override it.
1283 */
1284 __be32 __init root_nfs_parse_addr(char *name)
1285 {
1286 __be32 addr;
1287 int octets = 0;
1288 char *cp, *cq;
1289
1290 cp = cq = name;
1291 while (octets < 4) {
1292 while (*cp >= '0' && *cp <= '9')
1293 cp++;
1294 if (cp == cq || cp - cq > 3)
1295 break;
1296 if (*cp == '.' || octets == 3)
1297 octets++;
1298 if (octets < 4)
1299 cp++;
1300 cq = cp;
1301 }
1302 if (octets == 4 && (*cp == ':' || *cp == '\0')) {
1303 if (*cp == ':')
1304 *cp++ = '\0';
1305 addr = in_aton(name);
1306 memmove(name, cp, strlen(cp) + 1);
1307 } else
1308 addr = NONE;
1309
1310 return addr;
1311 }
1312
1313 #define DEVICE_WAIT_MAX 12 /* 12 seconds */
1314
1315 static int __init wait_for_devices(void)
1316 {
1317 int i;
1318
1319 msleep(CONF_PRE_OPEN);
1320 for (i = 0; i < DEVICE_WAIT_MAX; i++) {
1321 struct net_device *dev;
1322 int found = 0;
1323
1324 rtnl_lock();
1325 for_each_netdev(&init_net, dev) {
1326 if (ic_device_match(dev)) {
1327 found = 1;
1328 break;
1329 }
1330 }
1331 rtnl_unlock();
1332 if (found)
1333 return 0;
1334 ssleep(1);
1335 }
1336 return -ENODEV;
1337 }
1338
1339 /*
1340 * IP Autoconfig dispatcher.
1341 */
1342
1343 static int __init ip_auto_config(void)
1344 {
1345 __be32 addr;
1346 #ifdef IPCONFIG_DYNAMIC
1347 int retries = CONF_OPEN_RETRIES;
1348 #endif
1349 int err;
1350
1351 #ifdef CONFIG_PROC_FS
1352 proc_net_fops_create(&init_net, "pnp", S_IRUGO, &pnp_seq_fops);
1353 #endif /* CONFIG_PROC_FS */
1354
1355 if (!ic_enable)
1356 return 0;
1357
1358 DBG(("IP-Config: Entered.\n"));
1359 #ifdef IPCONFIG_DYNAMIC
1360 try_try_again:
1361 #endif
1362 /* Wait for devices to appear */
1363 err = wait_for_devices();
1364 if (err)
1365 return err;
1366
1367 /* Setup all network devices */
1368 err = ic_open_devs();
1369 if (err)
1370 return err;
1371
1372 /* Give drivers a chance to settle */
1373 ssleep(CONF_POST_OPEN);
1374
1375 /*
1376 * If the config information is insufficient (e.g., our IP address or
1377 * IP address of the boot server is missing or we have multiple network
1378 * interfaces and no default was set), use BOOTP or RARP to get the
1379 * missing values.
1380 */
1381 if (ic_myaddr == NONE ||
1382 #ifdef CONFIG_ROOT_NFS
1383 (root_server_addr == NONE &&
1384 ic_servaddr == NONE &&
1385 ROOT_DEV == Root_NFS) ||
1386 #endif
1387 ic_first_dev->next) {
1388 #ifdef IPCONFIG_DYNAMIC
1389 if (ic_dynamic() < 0) {
1390 ic_close_devs();
1391
1392 /*
1393 * I don't know why, but sometimes the
1394 * eepro100 driver (at least) gets upset and
1395 * doesn't work the first time it's opened.
1396 * But then if you close it and reopen it, it
1397 * works just fine. So we need to try that at
1398 * least once before giving up.
1399 *
1400 * Also, if the root will be NFS-mounted, we
1401 * have nowhere to go if DHCP fails. So we
1402 * just have to keep trying forever.
1403 *
1404 * -- Chip
1405 */
1406 #ifdef CONFIG_ROOT_NFS
1407 if (ROOT_DEV == Root_NFS) {
1408 printk(KERN_ERR
1409 "IP-Config: Retrying forever (NFS root)...\n");
1410 goto try_try_again;
1411 }
1412 #endif
1413
1414 if (--retries) {
1415 printk(KERN_ERR
1416 "IP-Config: Reopening network devices...\n");
1417 goto try_try_again;
1418 }
1419
1420 /* Oh, well. At least we tried. */
1421 printk(KERN_ERR "IP-Config: Auto-configuration of network failed.\n");
1422 return -1;
1423 }
1424 #else /* !DYNAMIC */
1425 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
1426 ic_close_devs();
1427 return -1;
1428 #endif /* IPCONFIG_DYNAMIC */
1429 } else {
1430 /* Device selected manually or only one device -> use it */
1431 ic_dev = ic_first_dev->dev;
1432 }
1433
1434 addr = root_nfs_parse_addr(root_server_path);
1435 if (root_server_addr == NONE)
1436 root_server_addr = addr;
1437
1438 /*
1439 * Use defaults whereever applicable.
1440 */
1441 if (ic_defaults() < 0)
1442 return -1;
1443
1444 /*
1445 * Close all network devices except the device we've
1446 * autoconfigured and set up routes.
1447 */
1448 ic_close_devs();
1449 if (ic_setup_if() < 0 || ic_setup_routes() < 0)
1450 return -1;
1451
1452 /*
1453 * Record which protocol was actually used.
1454 */
1455 #ifdef IPCONFIG_DYNAMIC
1456 ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP);
1457 #endif
1458
1459 #ifndef IPCONFIG_SILENT
1460 /*
1461 * Clue in the operator.
1462 */
1463 printk("IP-Config: Complete:");
1464 printk("\n device=%s", ic_dev->name);
1465 printk(", addr=%pI4", &ic_myaddr);
1466 printk(", mask=%pI4", &ic_netmask);
1467 printk(", gw=%pI4", &ic_gateway);
1468 printk(",\n host=%s, domain=%s, nis-domain=%s",
1469 utsname()->nodename, ic_domain, utsname()->domainname);
1470 printk(",\n bootserver=%pI4", &ic_servaddr);
1471 printk(", rootserver=%pI4", &root_server_addr);
1472 printk(", rootpath=%s", root_server_path);
1473 if (ic_dev_mtu)
1474 printk(", mtu=%d", ic_dev_mtu);
1475 printk("\n");
1476 #endif /* !SILENT */
1477
1478 return 0;
1479 }
1480
1481 late_initcall(ip_auto_config);
1482
1483
1484 /*
1485 * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
1486 * command line parameter. See Documentation/filesystems/nfs/nfsroot.txt.
1487 */
1488 static int __init ic_proto_name(char *name)
1489 {
1490 if (!strcmp(name, "on") || !strcmp(name, "any")) {
1491 return 1;
1492 }
1493 if (!strcmp(name, "off") || !strcmp(name, "none")) {
1494 return 0;
1495 }
1496 #ifdef CONFIG_IP_PNP_DHCP
1497 else if (!strcmp(name, "dhcp")) {
1498 ic_proto_enabled &= ~IC_RARP;
1499 return 1;
1500 }
1501 #endif
1502 #ifdef CONFIG_IP_PNP_BOOTP
1503 else if (!strcmp(name, "bootp")) {
1504 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP);
1505 return 1;
1506 }
1507 #endif
1508 #ifdef CONFIG_IP_PNP_RARP
1509 else if (!strcmp(name, "rarp")) {
1510 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP);
1511 return 1;
1512 }
1513 #endif
1514 #ifdef IPCONFIG_DYNAMIC
1515 else if (!strcmp(name, "both")) {
1516 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */
1517 return 1;
1518 }
1519 #endif
1520 return 0;
1521 }
1522
1523 static int __init ip_auto_config_setup(char *addrs)
1524 {
1525 char *cp, *ip, *dp;
1526 int num = 0;
1527
1528 ic_set_manually = 1;
1529 ic_enable = 1;
1530
1531 /*
1532 * If any dhcp, bootp etc options are set, leave autoconfig on
1533 * and skip the below static IP processing.
1534 */
1535 if (ic_proto_name(addrs))
1536 return 1;
1537
1538 /* If no static IP is given, turn off autoconfig and bail. */
1539 if (*addrs == 0 ||
1540 strcmp(addrs, "off") == 0 ||
1541 strcmp(addrs, "none") == 0) {
1542 ic_enable = 0;
1543 return 1;
1544 }
1545
1546 /* Parse string for static IP assignment. */
1547 ip = addrs;
1548 while (ip && *ip) {
1549 if ((cp = strchr(ip, ':')))
1550 *cp++ = '\0';
1551 if (strlen(ip) > 0) {
1552 DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip));
1553 switch (num) {
1554 case 0:
1555 if ((ic_myaddr = in_aton(ip)) == ANY)
1556 ic_myaddr = NONE;
1557 break;
1558 case 1:
1559 if ((ic_servaddr = in_aton(ip)) == ANY)
1560 ic_servaddr = NONE;
1561 break;
1562 case 2:
1563 if ((ic_gateway = in_aton(ip)) == ANY)
1564 ic_gateway = NONE;
1565 break;
1566 case 3:
1567 if ((ic_netmask = in_aton(ip)) == ANY)
1568 ic_netmask = NONE;
1569 break;
1570 case 4:
1571 if ((dp = strchr(ip, '.'))) {
1572 *dp++ = '\0';
1573 strlcpy(utsname()->domainname, dp,
1574 sizeof(utsname()->domainname));
1575 }
1576 strlcpy(utsname()->nodename, ip,
1577 sizeof(utsname()->nodename));
1578 ic_host_name_set = 1;
1579 break;
1580 case 5:
1581 strlcpy(user_dev_name, ip, sizeof(user_dev_name));
1582 break;
1583 case 6:
1584 if (ic_proto_name(ip) == 0 &&
1585 ic_myaddr == NONE) {
1586 ic_enable = 0;
1587 }
1588 break;
1589 }
1590 }
1591 ip = cp;
1592 num++;
1593 }
1594
1595 return 1;
1596 }
1597
1598 static int __init nfsaddrs_config_setup(char *addrs)
1599 {
1600 return ip_auto_config_setup(addrs);
1601 }
1602
1603 static int __init vendor_class_identifier_setup(char *addrs)
1604 {
1605 if (strlcpy(vendor_class_identifier, addrs,
1606 sizeof(vendor_class_identifier))
1607 >= sizeof(vendor_class_identifier))
1608 printk(KERN_WARNING "DHCP: vendorclass too long, truncated to \"%s\"",
1609 vendor_class_identifier);
1610 return 1;
1611 }
1612
1613 __setup("ip=", ip_auto_config_setup);
1614 __setup("nfsaddrs=", nfsaddrs_config_setup);
1615 __setup("dhcpclass=", vendor_class_identifier_setup);
Linux 2.6 libata-dev (mirror)