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