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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 <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#if defined(CONFIG_IP_PNP_DHCP)
69#define IPCONFIG_DHCP
70#endif
71#if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_DHCP)
72#define IPCONFIG_BOOTP
73#endif
74#if defined(CONFIG_IP_PNP_RARP)
75#define IPCONFIG_RARP
76#endif
77#if defined(IPCONFIG_BOOTP) || defined(IPCONFIG_RARP)
78#define IPCONFIG_DYNAMIC
79#endif
80
81/* Define the friendly delay before and after opening net devices */
82#define CONF_POST_OPEN 10 /* After opening: 10 msecs */
83#define CONF_CARRIER_TIMEOUT 120000 /* Wait for carrier timeout */
84
85/* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */
86#define CONF_OPEN_RETRIES 2 /* (Re)open devices twice */
87#define CONF_SEND_RETRIES 6 /* Send six requests per open */
88#define CONF_INTER_TIMEOUT (HZ) /* Inter-device timeout: 1 second */
89#define CONF_BASE_TIMEOUT (HZ*2) /* Initial timeout: 2 seconds */
90#define CONF_TIMEOUT_RANDOM (HZ) /* Maximum amount of randomization */
91#define CONF_TIMEOUT_MULT *7/4 /* Rate of timeout growth */
92#define CONF_TIMEOUT_MAX (HZ*30) /* Maximum allowed timeout */
93#define CONF_NAMESERVERS_MAX 3 /* Maximum number of nameservers
94 - '3' from resolv.h */
95
96#define NONE cpu_to_be32(INADDR_NONE)
97#define ANY cpu_to_be32(INADDR_ANY)
98
99/*
100 * Public IP configuration
101 */
102
103/* This is used by platforms which might be able to set the ipconfig
104 * variables using firmware environment vars. If this is set, it will
105 * ignore such firmware variables.
106 */
107int ic_set_manually __initdata = 0; /* IPconfig parameters set manually */
108
109static int ic_enable __initdata; /* IP config enabled? */
110
111/* Protocol choice */
112int ic_proto_enabled __initdata = 0
113#ifdef IPCONFIG_BOOTP
114 | IC_BOOTP
115#endif
116#ifdef CONFIG_IP_PNP_DHCP
117 | IC_USE_DHCP
118#endif
119#ifdef IPCONFIG_RARP
120 | IC_RARP
121#endif
122 ;
123
124static int ic_host_name_set __initdata; /* Host name set by us? */
125
126__be32 ic_myaddr = NONE; /* My IP address */
127static __be32 ic_netmask = NONE; /* Netmask for local subnet */
128__be32 ic_gateway = NONE; /* Gateway IP address */
129
130__be32 ic_addrservaddr = NONE; /* IP Address of the IP addresses'server */
131
132__be32 ic_servaddr = NONE; /* Boot server IP address */
133
134__be32 root_server_addr = NONE; /* Address of NFS server */
135u8 root_server_path[256] = { 0, }; /* Path to mount as root */
136
137/* vendor class identifier */
138static char vendor_class_identifier[253] __initdata;
139
140#if defined(CONFIG_IP_PNP_DHCP)
141static char dhcp_client_identifier[253] __initdata;
142#endif
143
144/* Persistent data: */
145
146#ifdef IPCONFIG_DYNAMIC
147static int ic_proto_used; /* Protocol used, if any */
148#else
149#define ic_proto_used 0
150#endif
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;
163
164/* MTU for boot device */
165static int ic_dev_mtu __initdata;
166
167#ifdef IPCONFIG_DYNAMIC
168static DEFINE_SPINLOCK(ic_recv_lock);
169static volatile int ic_got_reply __initdata; /* Proto(s) that replied */
170#endif
171#ifdef IPCONFIG_DHCP
172static int ic_dhcp_msgtype __initdata; /* 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; /* List of open device */
189static struct net_device *ic_dev __initdata; /* 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, next_msg;
207
208 last = &ic_first_dev;
209 rtnl_lock();
210
211 /* bring loopback and DSA master network devices up first */
212 for_each_netdev(&init_net, dev) {
213 if (!(dev->flags & IFF_LOOPBACK) && !netdev_uses_dsa(dev))
214 continue;
215 if (dev_change_flags(dev, dev->flags | IFF_UP) < 0)
216 pr_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 pr_warn("DHCP/BOOTP: Ignoring device %s, MTU %d too small\n",
226 dev->name, dev->mtu);
227 if (!(dev->flags & IFF_NOARP))
228 able |= IC_RARP;
229 able &= ic_proto_enabled;
230 if (ic_proto_enabled && !able)
231 continue;
232 oflags = dev->flags;
233 if (dev_change_flags(dev, oflags | IFF_UP) < 0) {
234 pr_err("IP-Config: Failed to open %s\n",
235 dev->name);
236 continue;
237 }
238 if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) {
239 rtnl_unlock();
240 return -ENOMEM;
241 }
242 d->dev = dev;
243 *last = d;
244 last = &d->next;
245 d->flags = oflags;
246 d->able = able;
247 if (able & IC_BOOTP)
248 get_random_bytes(&d->xid, sizeof(__be32));
249 else
250 d->xid = 0;
251 ic_proto_have_if |= able;
252 pr_debug("IP-Config: %s UP (able=%d, xid=%08x)\n",
253 dev->name, able, d->xid);
254 }
255 }
256
257 /* no point in waiting if we could not bring up at least one device */
258 if (!ic_first_dev)
259 goto have_carrier;
260
261 /* wait for a carrier on at least one device */
262 start = jiffies;
263 next_msg = start + msecs_to_jiffies(CONF_CARRIER_TIMEOUT/12);
264 while (time_before(jiffies, start +
265 msecs_to_jiffies(CONF_CARRIER_TIMEOUT))) {
266 int wait, elapsed;
267
268 for_each_netdev(&init_net, dev)
269 if (ic_is_init_dev(dev) && netif_carrier_ok(dev))
270 goto have_carrier;
271
272 msleep(1);
273
274 if (time_before(jiffies, next_msg))
275 continue;
276
277 elapsed = jiffies_to_msecs(jiffies - start);
278 wait = (CONF_CARRIER_TIMEOUT - elapsed + 500)/1000;
279 pr_info("Waiting up to %d more seconds for network.\n", wait);
280 next_msg = jiffies + msecs_to_jiffies(CONF_CARRIER_TIMEOUT/12);
281 }
282have_carrier:
283 rtnl_unlock();
284
285 *last = NULL;
286
287 if (!ic_first_dev) {
288 if (user_dev_name[0])
289 pr_err("IP-Config: Device `%s' not found\n",
290 user_dev_name);
291 else
292 pr_err("IP-Config: No network devices available\n");
293 return -ENODEV;
294 }
295 return 0;
296}
297
298static void __init ic_close_devs(void)
299{
300 struct ic_device *d, *next;
301 struct net_device *dev;
302
303 rtnl_lock();
304 next = ic_first_dev;
305 while ((d = next)) {
306 next = d->next;
307 dev = d->dev;
308 if (dev != ic_dev && !netdev_uses_dsa(dev)) {
309 pr_debug("IP-Config: Downing %s\n", dev->name);
310 dev_change_flags(dev, d->flags);
311 }
312 kfree(d);
313 }
314 rtnl_unlock();
315}
316
317/*
318 * Interface to various network functions.
319 */
320
321static inline void
322set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port)
323{
324 sin->sin_family = AF_INET;
325 sin->sin_addr.s_addr = addr;
326 sin->sin_port = port;
327}
328
329static int __init ic_devinet_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 = devinet_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
336 set_fs(oldfs);
337 return res;
338}
339
340static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg)
341{
342 int res;
343
344 mm_segment_t oldfs = get_fs();
345 set_fs(get_ds());
346 res = dev_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
347 set_fs(oldfs);
348 return res;
349}
350
351static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg)
352{
353 int res;
354
355 mm_segment_t oldfs = get_fs();
356 set_fs(get_ds());
357 res = ip_rt_ioctl(&init_net, cmd, (void __user *) arg);
358 set_fs(oldfs);
359 return res;
360}
361
362/*
363 * Set up interface addresses and routes.
364 */
365
366static int __init ic_setup_if(void)
367{
368 struct ifreq ir;
369 struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr;
370 int err;
371
372 memset(&ir, 0, sizeof(ir));
373 strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name);
374 set_sockaddr(sin, ic_myaddr, 0);
375 if ((err = ic_devinet_ioctl(SIOCSIFADDR, &ir)) < 0) {
376 pr_err("IP-Config: Unable to set interface address (%d)\n",
377 err);
378 return -1;
379 }
380 set_sockaddr(sin, ic_netmask, 0);
381 if ((err = ic_devinet_ioctl(SIOCSIFNETMASK, &ir)) < 0) {
382 pr_err("IP-Config: Unable to set interface netmask (%d)\n",
383 err);
384 return -1;
385 }
386 set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0);
387 if ((err = ic_devinet_ioctl(SIOCSIFBRDADDR, &ir)) < 0) {
388 pr_err("IP-Config: Unable to set interface broadcast address (%d)\n",
389 err);
390 return -1;
391 }
392 /* Handle the case where we need non-standard MTU on the boot link (a network
393 * using jumbo frames, for instance). If we can't set the mtu, don't error
394 * out, we'll try to muddle along.
395 */
396 if (ic_dev_mtu != 0) {
397 strcpy(ir.ifr_name, ic_dev->name);
398 ir.ifr_mtu = ic_dev_mtu;
399 if ((err = ic_dev_ioctl(SIOCSIFMTU, &ir)) < 0)
400 pr_err("IP-Config: Unable to set interface mtu to %d (%d)\n",
401 ic_dev_mtu, err);
402 }
403 return 0;
404}
405
406static int __init ic_setup_routes(void)
407{
408 /* No need to setup device routes, only the default route... */
409
410 if (ic_gateway != NONE) {
411 struct rtentry rm;
412 int err;
413
414 memset(&rm, 0, sizeof(rm));
415 if ((ic_gateway ^ ic_myaddr) & ic_netmask) {
416 pr_err("IP-Config: Gateway not on directly connected network\n");
417 return -1;
418 }
419 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0);
420 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0);
421 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0);
422 rm.rt_flags = RTF_UP | RTF_GATEWAY;
423 if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) {
424 pr_err("IP-Config: Cannot add default route (%d)\n",
425 err);
426 return -1;
427 }
428 }
429
430 return 0;
431}
432
433/*
434 * Fill in default values for all missing parameters.
435 */
436
437static int __init ic_defaults(void)
438{
439 /*
440 * At this point we have no userspace running so need not
441 * claim locks on system_utsname
442 */
443
444 if (!ic_host_name_set)
445 sprintf(init_utsname()->nodename, "%pI4", &ic_myaddr);
446
447 if (root_server_addr == NONE)
448 root_server_addr = ic_servaddr;
449
450 if (ic_netmask == NONE) {
451 if (IN_CLASSA(ntohl(ic_myaddr)))
452 ic_netmask = htonl(IN_CLASSA_NET);
453 else if (IN_CLASSB(ntohl(ic_myaddr)))
454 ic_netmask = htonl(IN_CLASSB_NET);
455 else if (IN_CLASSC(ntohl(ic_myaddr)))
456 ic_netmask = htonl(IN_CLASSC_NET);
457 else {
458 pr_err("IP-Config: Unable to guess netmask for address %pI4\n",
459 &ic_myaddr);
460 return -1;
461 }
462 pr_notice("IP-Config: Guessing netmask %pI4\n",
463 &ic_netmask);
464 }
465
466 return 0;
467}
468
469/*
470 * RARP support.
471 */
472
473#ifdef IPCONFIG_RARP
474
475static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
476
477static struct packet_type rarp_packet_type __initdata = {
478 .type = cpu_to_be16(ETH_P_RARP),
479 .func = ic_rarp_recv,
480};
481
482static inline void __init ic_rarp_init(void)
483{
484 dev_add_pack(&rarp_packet_type);
485}
486
487static inline void __init ic_rarp_cleanup(void)
488{
489 dev_remove_pack(&rarp_packet_type);
490}
491
492/*
493 * Process received RARP packet.
494 */
495static int __init
496ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
497{
498 struct arphdr *rarp;
499 unsigned char *rarp_ptr;
500 __be32 sip, tip;
501 unsigned char *tha; /* t for "target" */
502 struct ic_device *d;
503
504 if (!net_eq(dev_net(dev), &init_net))
505 goto drop;
506
507 skb = skb_share_check(skb, GFP_ATOMIC);
508 if (!skb)
509 return NET_RX_DROP;
510
511 if (!pskb_may_pull(skb, sizeof(struct arphdr)))
512 goto drop;
513
514 /* Basic sanity checks can be done without the lock. */
515 rarp = (struct arphdr *)skb_transport_header(skb);
516
517 /* If this test doesn't pass, it's not IP, or we should
518 * ignore it anyway.
519 */
520 if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd))
521 goto drop;
522
523 /* If it's not a RARP reply, delete it. */
524 if (rarp->ar_op != htons(ARPOP_RREPLY))
525 goto drop;
526
527 /* If it's not Ethernet, delete it. */
528 if (rarp->ar_pro != htons(ETH_P_IP))
529 goto drop;
530
531 if (!pskb_may_pull(skb, arp_hdr_len(dev)))
532 goto drop;
533
534 /* OK, it is all there and looks valid, process... */
535 rarp = (struct arphdr *)skb_transport_header(skb);
536 rarp_ptr = (unsigned char *) (rarp + 1);
537
538 /* One reply at a time, please. */
539 spin_lock(&ic_recv_lock);
540
541 /* If we already have a reply, just drop the packet */
542 if (ic_got_reply)
543 goto drop_unlock;
544
545 /* Find the ic_device that the packet arrived on */
546 d = ic_first_dev;
547 while (d && d->dev != dev)
548 d = d->next;
549 if (!d)
550 goto drop_unlock; /* should never happen */
551
552 /* Extract variable-width fields */
553 rarp_ptr += dev->addr_len;
554 memcpy(&sip, rarp_ptr, 4);
555 rarp_ptr += 4;
556 tha = rarp_ptr;
557 rarp_ptr += dev->addr_len;
558 memcpy(&tip, rarp_ptr, 4);
559
560 /* Discard packets which are not meant for us. */
561 if (memcmp(tha, dev->dev_addr, dev->addr_len))
562 goto drop_unlock;
563
564 /* Discard packets which are not from specified server. */
565 if (ic_servaddr != NONE && ic_servaddr != sip)
566 goto drop_unlock;
567
568 /* We have a winner! */
569 ic_dev = dev;
570 if (ic_myaddr == NONE)
571 ic_myaddr = tip;
572 ic_servaddr = sip;
573 ic_addrservaddr = sip;
574 ic_got_reply = IC_RARP;
575
576drop_unlock:
577 /* Show's over. Nothing to see here. */
578 spin_unlock(&ic_recv_lock);
579
580drop:
581 /* Throw the packet out. */
582 kfree_skb(skb);
583 return 0;
584}
585
586
587/*
588 * Send RARP request packet over a single interface.
589 */
590static void __init ic_rarp_send_if(struct ic_device *d)
591{
592 struct net_device *dev = d->dev;
593 arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL,
594 dev->dev_addr, dev->dev_addr);
595}
596#endif
597
598/*
599 * Predefine Nameservers
600 */
601static inline void __init ic_nameservers_predef(void)
602{
603 int i;
604
605 for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
606 ic_nameservers[i] = NONE;
607}
608
609/*
610 * DHCP/BOOTP support.
611 */
612
613#ifdef IPCONFIG_BOOTP
614
615struct bootp_pkt { /* BOOTP packet format */
616 struct iphdr iph; /* IP header */
617 struct udphdr udph; /* UDP header */
618 u8 op; /* 1=request, 2=reply */
619 u8 htype; /* HW address type */
620 u8 hlen; /* HW address length */
621 u8 hops; /* Used only by gateways */
622 __be32 xid; /* Transaction ID */
623 __be16 secs; /* Seconds since we started */
624 __be16 flags; /* Just what it says */
625 __be32 client_ip; /* Client's IP address if known */
626 __be32 your_ip; /* Assigned IP address */
627 __be32 server_ip; /* (Next, e.g. NFS) Server's IP address */
628 __be32 relay_ip; /* IP address of BOOTP relay */
629 u8 hw_addr[16]; /* Client's HW address */
630 u8 serv_name[64]; /* Server host name */
631 u8 boot_file[128]; /* Name of boot file */
632 u8 exten[312]; /* DHCP options / BOOTP vendor extensions */
633};
634
635/* packet ops */
636#define BOOTP_REQUEST 1
637#define BOOTP_REPLY 2
638
639/* DHCP message types */
640#define DHCPDISCOVER 1
641#define DHCPOFFER 2
642#define DHCPREQUEST 3
643#define DHCPDECLINE 4
644#define DHCPACK 5
645#define DHCPNAK 6
646#define DHCPRELEASE 7
647#define DHCPINFORM 8
648
649static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
650
651static struct packet_type bootp_packet_type __initdata = {
652 .type = cpu_to_be16(ETH_P_IP),
653 .func = ic_bootp_recv,
654};
655
656static __be32 ic_dev_xid; /* Device under configuration */
657
658/*
659 * Initialize DHCP/BOOTP extension fields in the request.
660 */
661
662static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 };
663
664#ifdef IPCONFIG_DHCP
665
666static void __init
667ic_dhcp_init_options(u8 *options)
668{
669 u8 mt = ((ic_servaddr == NONE)
670 ? DHCPDISCOVER : DHCPREQUEST);
671 u8 *e = options;
672 int len;
673
674 pr_debug("DHCP: Sending message type %d\n", mt);
675
676 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */
677 e += 4;
678
679 *e++ = 53; /* DHCP message type */
680 *e++ = 1;
681 *e++ = mt;
682
683 if (mt == DHCPREQUEST) {
684 *e++ = 54; /* Server ID (IP address) */
685 *e++ = 4;
686 memcpy(e, &ic_servaddr, 4);
687 e += 4;
688
689 *e++ = 50; /* Requested IP address */
690 *e++ = 4;
691 memcpy(e, &ic_myaddr, 4);
692 e += 4;
693 }
694
695 /* always? */
696 {
697 static const u8 ic_req_params[] = {
698 1, /* Subnet mask */
699 3, /* Default gateway */
700 6, /* DNS server */
701 12, /* Host name */
702 15, /* Domain name */
703 17, /* Boot path */
704 26, /* MTU */
705 40, /* NIS domain name */
706 };
707
708 *e++ = 55; /* Parameter request list */
709 *e++ = sizeof(ic_req_params);
710 memcpy(e, ic_req_params, sizeof(ic_req_params));
711 e += sizeof(ic_req_params);
712
713 if (ic_host_name_set) {
714 *e++ = 12; /* host-name */
715 len = strlen(utsname()->nodename);
716 *e++ = len;
717 memcpy(e, utsname()->nodename, len);
718 e += len;
719 }
720 if (*vendor_class_identifier) {
721 pr_info("DHCP: sending class identifier \"%s\"\n",
722 vendor_class_identifier);
723 *e++ = 60; /* Class-identifier */
724 len = strlen(vendor_class_identifier);
725 *e++ = len;
726 memcpy(e, vendor_class_identifier, len);
727 e += len;
728 }
729 len = strlen(dhcp_client_identifier + 1);
730 /* the minimum length of identifier is 2, include 1 byte type,
731 * and can not be larger than the length of options
732 */
733 if (len >= 1 && len < 312 - (e - options) - 1) {
734 *e++ = 61;
735 *e++ = len + 1;
736 memcpy(e, dhcp_client_identifier, len + 1);
737 e += len + 1;
738 }
739 }
740
741 *e++ = 255; /* End of the list */
742}
743
744#endif /* IPCONFIG_DHCP */
745
746static void __init ic_bootp_init_ext(u8 *e)
747{
748 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */
749 e += 4;
750 *e++ = 1; /* Subnet mask request */
751 *e++ = 4;
752 e += 4;
753 *e++ = 3; /* Default gateway request */
754 *e++ = 4;
755 e += 4;
756 *e++ = 5; /* Name server request */
757 *e++ = 8;
758 e += 8;
759 *e++ = 12; /* Host name request */
760 *e++ = 32;
761 e += 32;
762 *e++ = 40; /* NIS Domain name request */
763 *e++ = 32;
764 e += 32;
765 *e++ = 17; /* Boot path */
766 *e++ = 40;
767 e += 40;
768
769 *e++ = 57; /* set extension buffer size for reply */
770 *e++ = 2;
771 *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */
772 *e++ = 150;
773
774 *e++ = 255; /* End of the list */
775}
776
777
778/*
779 * Initialize the DHCP/BOOTP mechanism.
780 */
781static inline void __init ic_bootp_init(void)
782{
783 ic_nameservers_predef();
784
785 dev_add_pack(&bootp_packet_type);
786}
787
788
789/*
790 * DHCP/BOOTP cleanup.
791 */
792static inline void __init ic_bootp_cleanup(void)
793{
794 dev_remove_pack(&bootp_packet_type);
795}
796
797
798/*
799 * Send DHCP/BOOTP request to single interface.
800 */
801static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff)
802{
803 struct net_device *dev = d->dev;
804 struct sk_buff *skb;
805 struct bootp_pkt *b;
806 struct iphdr *h;
807 int hlen = LL_RESERVED_SPACE(dev);
808 int tlen = dev->needed_tailroom;
809
810 /* Allocate packet */
811 skb = alloc_skb(sizeof(struct bootp_pkt) + hlen + tlen + 15,
812 GFP_KERNEL);
813 if (!skb)
814 return;
815 skb_reserve(skb, hlen);
816 b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt));
817 memset(b, 0, sizeof(struct bootp_pkt));
818
819 /* Construct IP header */
820 skb_reset_network_header(skb);
821 h = ip_hdr(skb);
822 h->version = 4;
823 h->ihl = 5;
824 h->tot_len = htons(sizeof(struct bootp_pkt));
825 h->frag_off = htons(IP_DF);
826 h->ttl = 64;
827 h->protocol = IPPROTO_UDP;
828 h->daddr = htonl(INADDR_BROADCAST);
829 h->check = ip_fast_csum((unsigned char *) h, h->ihl);
830
831 /* Construct UDP header */
832 b->udph.source = htons(68);
833 b->udph.dest = htons(67);
834 b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr));
835 /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */
836
837 /* Construct DHCP/BOOTP header */
838 b->op = BOOTP_REQUEST;
839 if (dev->type < 256) /* check for false types */
840 b->htype = dev->type;
841 else if (dev->type == ARPHRD_FDDI)
842 b->htype = ARPHRD_ETHER;
843 else {
844 pr_warn("Unknown ARP type 0x%04x for device %s\n", dev->type,
845 dev->name);
846 b->htype = dev->type; /* can cause undefined behavior */
847 }
848
849 /* server_ip and your_ip address are both already zero per RFC2131 */
850 b->hlen = dev->addr_len;
851 memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
852 b->secs = htons(jiffies_diff / HZ);
853 b->xid = d->xid;
854
855 /* add DHCP options or BOOTP extensions */
856#ifdef IPCONFIG_DHCP
857 if (ic_proto_enabled & IC_USE_DHCP)
858 ic_dhcp_init_options(b->exten);
859 else
860#endif
861 ic_bootp_init_ext(b->exten);
862
863 /* Chain packet down the line... */
864 skb->dev = dev;
865 skb->protocol = htons(ETH_P_IP);
866 if (dev_hard_header(skb, dev, ntohs(skb->protocol),
867 dev->broadcast, dev->dev_addr, skb->len) < 0) {
868 kfree_skb(skb);
869 printk("E");
870 return;
871 }
872
873 if (dev_queue_xmit(skb) < 0)
874 printk("E");
875}
876
877
878/*
879 * Copy BOOTP-supplied string if not already set.
880 */
881static int __init ic_bootp_string(char *dest, char *src, int len, int max)
882{
883 if (!len)
884 return 0;
885 if (len > max-1)
886 len = max-1;
887 memcpy(dest, src, len);
888 dest[len] = '\0';
889 return 1;
890}
891
892
893/*
894 * Process BOOTP extensions.
895 */
896static void __init ic_do_bootp_ext(u8 *ext)
897{
898 u8 servers;
899 int i;
900 __be16 mtu;
901
902 u8 *c;
903
904 pr_debug("DHCP/BOOTP: Got extension %d:", *ext);
905 for (c=ext+2; c<ext+2+ext[1]; c++)
906 pr_debug(" %02x", *c);
907 pr_debug("\n");
908
909 switch (*ext++) {
910 case 1: /* Subnet mask */
911 if (ic_netmask == NONE)
912 memcpy(&ic_netmask, ext+1, 4);
913 break;
914 case 3: /* Default gateway */
915 if (ic_gateway == NONE)
916 memcpy(&ic_gateway, ext+1, 4);
917 break;
918 case 6: /* DNS server */
919 servers= *ext/4;
920 if (servers > CONF_NAMESERVERS_MAX)
921 servers = CONF_NAMESERVERS_MAX;
922 for (i = 0; i < servers; i++) {
923 if (ic_nameservers[i] == NONE)
924 memcpy(&ic_nameservers[i], ext+1+4*i, 4);
925 }
926 break;
927 case 12: /* Host name */
928 ic_bootp_string(utsname()->nodename, ext+1, *ext,
929 __NEW_UTS_LEN);
930 ic_host_name_set = 1;
931 break;
932 case 15: /* Domain name (DNS) */
933 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
934 break;
935 case 17: /* Root path */
936 if (!root_server_path[0])
937 ic_bootp_string(root_server_path, ext+1, *ext,
938 sizeof(root_server_path));
939 break;
940 case 26: /* Interface MTU */
941 memcpy(&mtu, ext+1, sizeof(mtu));
942 ic_dev_mtu = ntohs(mtu);
943 break;
944 case 40: /* NIS Domain name (_not_ DNS) */
945 ic_bootp_string(utsname()->domainname, ext+1, *ext,
946 __NEW_UTS_LEN);
947 break;
948 }
949}
950
951
952/*
953 * Receive BOOTP reply.
954 */
955static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
956{
957 struct bootp_pkt *b;
958 struct iphdr *h;
959 struct ic_device *d;
960 int len, ext_len;
961
962 if (!net_eq(dev_net(dev), &init_net))
963 goto drop;
964
965 /* Perform verifications before taking the lock. */
966 if (skb->pkt_type == PACKET_OTHERHOST)
967 goto drop;
968
969 skb = skb_share_check(skb, GFP_ATOMIC);
970 if (!skb)
971 return NET_RX_DROP;
972
973 if (!pskb_may_pull(skb,
974 sizeof(struct iphdr) +
975 sizeof(struct udphdr)))
976 goto drop;
977
978 b = (struct bootp_pkt *)skb_network_header(skb);
979 h = &b->iph;
980
981 if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP)
982 goto drop;
983
984 /* Fragments are not supported */
985 if (ip_is_fragment(h)) {
986 net_err_ratelimited("DHCP/BOOTP: Ignoring fragmented reply\n");
987 goto drop;
988 }
989
990 if (skb->len < ntohs(h->tot_len))
991 goto drop;
992
993 if (ip_fast_csum((char *) h, h->ihl))
994 goto drop;
995
996 if (b->udph.source != htons(67) || b->udph.dest != htons(68))
997 goto drop;
998
999 if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
1000 goto drop;
1001
1002 len = ntohs(b->udph.len) - sizeof(struct udphdr);
1003 ext_len = len - (sizeof(*b) -
1004 sizeof(struct iphdr) -
1005 sizeof(struct udphdr) -
1006 sizeof(b->exten));
1007 if (ext_len < 0)
1008 goto drop;
1009
1010 /* Ok the front looks good, make sure we can get at the rest. */
1011 if (!pskb_may_pull(skb, skb->len))
1012 goto drop;
1013
1014 b = (struct bootp_pkt *)skb_network_header(skb);
1015 h = &b->iph;
1016
1017 /* One reply at a time, please. */
1018 spin_lock(&ic_recv_lock);
1019
1020 /* If we already have a reply, just drop the packet */
1021 if (ic_got_reply)
1022 goto drop_unlock;
1023
1024 /* Find the ic_device that the packet arrived on */
1025 d = ic_first_dev;
1026 while (d && d->dev != dev)
1027 d = d->next;
1028 if (!d)
1029 goto drop_unlock; /* should never happen */
1030
1031 /* Is it a reply to our BOOTP request? */
1032 if (b->op != BOOTP_REPLY ||
1033 b->xid != d->xid) {
1034 net_err_ratelimited("DHCP/BOOTP: Reply not for us, op[%x] xid[%x]\n",
1035 b->op, b->xid);
1036 goto drop_unlock;
1037 }
1038
1039 /* Is it a reply for the device we are configuring? */
1040 if (b->xid != ic_dev_xid) {
1041 net_err_ratelimited("DHCP/BOOTP: Ignoring delayed packet\n");
1042 goto drop_unlock;
1043 }
1044
1045 /* Parse extensions */
1046 if (ext_len >= 4 &&
1047 !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */
1048 u8 *end = (u8 *) b + ntohs(b->iph.tot_len);
1049 u8 *ext;
1050
1051#ifdef IPCONFIG_DHCP
1052 if (ic_proto_enabled & IC_USE_DHCP) {
1053 __be32 server_id = NONE;
1054 int mt = 0;
1055
1056 ext = &b->exten[4];
1057 while (ext < end && *ext != 0xff) {
1058 u8 *opt = ext++;
1059 if (*opt == 0) /* Padding */
1060 continue;
1061 ext += *ext + 1;
1062 if (ext >= end)
1063 break;
1064 switch (*opt) {
1065 case 53: /* Message type */
1066 if (opt[1])
1067 mt = opt[2];
1068 break;
1069 case 54: /* Server ID (IP address) */
1070 if (opt[1] >= 4)
1071 memcpy(&server_id, opt + 2, 4);
1072 break;
1073 }
1074 }
1075
1076 pr_debug("DHCP: Got message type %d\n", mt);
1077
1078 switch (mt) {
1079 case DHCPOFFER:
1080 /* While in the process of accepting one offer,
1081 * ignore all others.
1082 */
1083 if (ic_myaddr != NONE)
1084 goto drop_unlock;
1085
1086 /* Let's accept that offer. */
1087 ic_myaddr = b->your_ip;
1088 ic_servaddr = server_id;
1089 pr_debug("DHCP: Offered address %pI4 by server %pI4\n",
1090 &ic_myaddr, &b->iph.saddr);
1091 /* The DHCP indicated server address takes
1092 * precedence over the bootp header one if
1093 * they are different.
1094 */
1095 if ((server_id != NONE) &&
1096 (b->server_ip != server_id))
1097 b->server_ip = ic_servaddr;
1098 break;
1099
1100 case DHCPACK:
1101 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0)
1102 goto drop_unlock;
1103
1104 /* Yeah! */
1105 break;
1106
1107 default:
1108 /* Urque. Forget it*/
1109 ic_myaddr = NONE;
1110 ic_servaddr = NONE;
1111 goto drop_unlock;
1112 }
1113
1114 ic_dhcp_msgtype = mt;
1115
1116 }
1117#endif /* IPCONFIG_DHCP */
1118
1119 ext = &b->exten[4];
1120 while (ext < end && *ext != 0xff) {
1121 u8 *opt = ext++;
1122 if (*opt == 0) /* Padding */
1123 continue;
1124 ext += *ext + 1;
1125 if (ext < end)
1126 ic_do_bootp_ext(opt);
1127 }
1128 }
1129
1130 /* We have a winner! */
1131 ic_dev = dev;
1132 ic_myaddr = b->your_ip;
1133 ic_servaddr = b->server_ip;
1134 ic_addrservaddr = b->iph.saddr;
1135 if (ic_gateway == NONE && b->relay_ip)
1136 ic_gateway = b->relay_ip;
1137 if (ic_nameservers[0] == NONE)
1138 ic_nameservers[0] = ic_servaddr;
1139 ic_got_reply = IC_BOOTP;
1140
1141drop_unlock:
1142 /* Show's over. Nothing to see here. */
1143 spin_unlock(&ic_recv_lock);
1144
1145drop:
1146 /* Throw the packet out. */
1147 kfree_skb(skb);
1148
1149 return 0;
1150}
1151
1152
1153#endif
1154
1155
1156/*
1157 * Dynamic IP configuration -- DHCP, BOOTP, RARP.
1158 */
1159
1160#ifdef IPCONFIG_DYNAMIC
1161
1162static int __init ic_dynamic(void)
1163{
1164 int retries;
1165 struct ic_device *d;
1166 unsigned long start_jiffies, timeout, jiff;
1167 int do_bootp = ic_proto_have_if & IC_BOOTP;
1168 int do_rarp = ic_proto_have_if & IC_RARP;
1169
1170 /*
1171 * If none of DHCP/BOOTP/RARP was selected, return with an error.
1172 * This routine gets only called when some pieces of information
1173 * are missing, and without DHCP/BOOTP/RARP we are unable to get it.
1174 */
1175 if (!ic_proto_enabled) {
1176 pr_err("IP-Config: Incomplete network configuration information\n");
1177 return -1;
1178 }
1179
1180#ifdef IPCONFIG_BOOTP
1181 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
1182 pr_err("DHCP/BOOTP: No suitable device found\n");
1183#endif
1184#ifdef IPCONFIG_RARP
1185 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)
1186 pr_err("RARP: No suitable device found\n");
1187#endif
1188
1189 if (!ic_proto_have_if)
1190 /* Error message already printed */
1191 return -1;
1192
1193 /*
1194 * Setup protocols
1195 */
1196#ifdef IPCONFIG_BOOTP
1197 if (do_bootp)
1198 ic_bootp_init();
1199#endif
1200#ifdef IPCONFIG_RARP
1201 if (do_rarp)
1202 ic_rarp_init();
1203#endif
1204
1205 /*
1206 * Send requests and wait, until we get an answer. This loop
1207 * seems to be a terrible waste of CPU time, but actually there is
1208 * only one process running at all, so we don't need to use any
1209 * scheduler functions.
1210 * [Actually we could now, but the nothing else running note still
1211 * applies.. - AC]
1212 */
1213 pr_notice("Sending %s%s%s requests .",
1214 do_bootp
1215 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "",
1216 (do_bootp && do_rarp) ? " and " : "",
1217 do_rarp ? "RARP" : "");
1218
1219 start_jiffies = jiffies;
1220 d = ic_first_dev;
1221 retries = CONF_SEND_RETRIES;
1222 get_random_bytes(&timeout, sizeof(timeout));
1223 timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned int) CONF_TIMEOUT_RANDOM);
1224 for (;;) {
1225#ifdef IPCONFIG_BOOTP
1226 /* Track the device we are configuring */
1227 ic_dev_xid = d->xid;
1228
1229 if (do_bootp && (d->able & IC_BOOTP))
1230 ic_bootp_send_if(d, jiffies - start_jiffies);
1231#endif
1232#ifdef IPCONFIG_RARP
1233 if (do_rarp && (d->able & IC_RARP))
1234 ic_rarp_send_if(d);
1235#endif
1236
1237 jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout);
1238 while (time_before(jiffies, jiff) && !ic_got_reply)
1239 schedule_timeout_uninterruptible(1);
1240#ifdef IPCONFIG_DHCP
1241 /* DHCP isn't done until we get a DHCPACK. */
1242 if ((ic_got_reply & IC_BOOTP) &&
1243 (ic_proto_enabled & IC_USE_DHCP) &&
1244 ic_dhcp_msgtype != DHCPACK) {
1245 ic_got_reply = 0;
1246 pr_cont(",");
1247 continue;
1248 }
1249#endif /* IPCONFIG_DHCP */
1250
1251 if (ic_got_reply) {
1252 pr_cont(" OK\n");
1253 break;
1254 }
1255
1256 if ((d = d->next))
1257 continue;
1258
1259 if (! --retries) {
1260 pr_cont(" timed out!\n");
1261 break;
1262 }
1263
1264 d = ic_first_dev;
1265
1266 timeout = timeout CONF_TIMEOUT_MULT;
1267 if (timeout > CONF_TIMEOUT_MAX)
1268 timeout = CONF_TIMEOUT_MAX;
1269
1270 pr_cont(".");
1271 }
1272
1273#ifdef IPCONFIG_BOOTP
1274 if (do_bootp)
1275 ic_bootp_cleanup();
1276#endif
1277#ifdef IPCONFIG_RARP
1278 if (do_rarp)
1279 ic_rarp_cleanup();
1280#endif
1281
1282 if (!ic_got_reply) {
1283 ic_myaddr = NONE;
1284 return -1;
1285 }
1286
1287 pr_info("IP-Config: Got %s answer from %pI4, my address is %pI4\n",
1288 ((ic_got_reply & IC_RARP) ? "RARP"
1289 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),
1290 &ic_addrservaddr, &ic_myaddr);
1291
1292 return 0;
1293}
1294
1295#endif /* IPCONFIG_DYNAMIC */
1296
1297#ifdef CONFIG_PROC_FS
1298
1299static int pnp_seq_show(struct seq_file *seq, void *v)
1300{
1301 int i;
1302
1303 if (ic_proto_used & IC_PROTO)
1304 seq_printf(seq, "#PROTO: %s\n",
1305 (ic_proto_used & IC_RARP) ? "RARP"
1306 : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP");
1307 else
1308 seq_puts(seq, "#MANUAL\n");
1309
1310 if (ic_domain[0])
1311 seq_printf(seq,
1312 "domain %s\n", ic_domain);
1313 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {
1314 if (ic_nameservers[i] != NONE)
1315 seq_printf(seq, "nameserver %pI4\n",
1316 &ic_nameservers[i]);
1317 }
1318 if (ic_servaddr != NONE)
1319 seq_printf(seq, "bootserver %pI4\n",
1320 &ic_servaddr);
1321 return 0;
1322}
1323
1324static int pnp_seq_open(struct inode *indoe, struct file *file)
1325{
1326 return single_open(file, pnp_seq_show, NULL);
1327}
1328
1329static const struct file_operations pnp_seq_fops = {
1330 .owner = THIS_MODULE,
1331 .open = pnp_seq_open,
1332 .read = seq_read,
1333 .llseek = seq_lseek,
1334 .release = single_release,
1335};
1336#endif /* CONFIG_PROC_FS */
1337
1338/*
1339 * Extract IP address from the parameter string if needed. Note that we
1340 * need to have root_server_addr set _before_ IPConfig gets called as it
1341 * can override it.
1342 */
1343__be32 __init root_nfs_parse_addr(char *name)
1344{
1345 __be32 addr;
1346 int octets = 0;
1347 char *cp, *cq;
1348
1349 cp = cq = name;
1350 while (octets < 4) {
1351 while (*cp >= '0' && *cp <= '9')
1352 cp++;
1353 if (cp == cq || cp - cq > 3)
1354 break;
1355 if (*cp == '.' || octets == 3)
1356 octets++;
1357 if (octets < 4)
1358 cp++;
1359 cq = cp;
1360 }
1361 if (octets == 4 && (*cp == ':' || *cp == '\0')) {
1362 if (*cp == ':')
1363 *cp++ = '\0';
1364 addr = in_aton(name);
1365 memmove(name, cp, strlen(cp) + 1);
1366 } else
1367 addr = NONE;
1368
1369 return addr;
1370}
1371
1372#define DEVICE_WAIT_MAX 12 /* 12 seconds */
1373
1374static int __init wait_for_devices(void)
1375{
1376 int i;
1377
1378 for (i = 0; i < DEVICE_WAIT_MAX; i++) {
1379 struct net_device *dev;
1380 int found = 0;
1381
1382 rtnl_lock();
1383 for_each_netdev(&init_net, dev) {
1384 if (ic_is_init_dev(dev)) {
1385 found = 1;
1386 break;
1387 }
1388 }
1389 rtnl_unlock();
1390 if (found)
1391 return 0;
1392 ssleep(1);
1393 }
1394 return -ENODEV;
1395}
1396
1397/*
1398 * IP Autoconfig dispatcher.
1399 */
1400
1401static int __init ip_auto_config(void)
1402{
1403 __be32 addr;
1404#ifdef IPCONFIG_DYNAMIC
1405 int retries = CONF_OPEN_RETRIES;
1406#endif
1407 int err;
1408 unsigned int i;
1409
1410#ifdef CONFIG_PROC_FS
1411 proc_create("pnp", S_IRUGO, init_net.proc_net, &pnp_seq_fops);
1412#endif /* CONFIG_PROC_FS */
1413
1414 if (!ic_enable)
1415 return 0;
1416
1417 pr_debug("IP-Config: Entered.\n");
1418#ifdef IPCONFIG_DYNAMIC
1419 try_try_again:
1420#endif
1421 /* Wait for devices to appear */
1422 err = wait_for_devices();
1423 if (err)
1424 return err;
1425
1426 /* Setup all network devices */
1427 err = ic_open_devs();
1428 if (err)
1429 return err;
1430
1431 /* Give drivers a chance to settle */
1432 msleep(CONF_POST_OPEN);
1433
1434 /*
1435 * If the config information is insufficient (e.g., our IP address or
1436 * IP address of the boot server is missing or we have multiple network
1437 * interfaces and no default was set), use BOOTP or RARP to get the
1438 * missing values.
1439 */
1440 if (ic_myaddr == NONE ||
1441#ifdef CONFIG_ROOT_NFS
1442 (root_server_addr == NONE &&
1443 ic_servaddr == NONE &&
1444 ROOT_DEV == Root_NFS) ||
1445#endif
1446 ic_first_dev->next) {
1447#ifdef IPCONFIG_DYNAMIC
1448 if (ic_dynamic() < 0) {
1449 ic_close_devs();
1450
1451 /*
1452 * I don't know why, but sometimes the
1453 * eepro100 driver (at least) gets upset and
1454 * doesn't work the first time it's opened.
1455 * But then if you close it and reopen it, it
1456 * works just fine. So we need to try that at
1457 * least once before giving up.
1458 *
1459 * Also, if the root will be NFS-mounted, we
1460 * have nowhere to go if DHCP fails. So we
1461 * just have to keep trying forever.
1462 *
1463 * -- Chip
1464 */
1465#ifdef CONFIG_ROOT_NFS
1466 if (ROOT_DEV == Root_NFS) {
1467 pr_err("IP-Config: Retrying forever (NFS root)...\n");
1468 goto try_try_again;
1469 }
1470#endif
1471
1472 if (--retries) {
1473 pr_err("IP-Config: Reopening network devices...\n");
1474 goto try_try_again;
1475 }
1476
1477 /* Oh, well. At least we tried. */
1478 pr_err("IP-Config: Auto-configuration of network failed\n");
1479 return -1;
1480 }
1481#else /* !DYNAMIC */
1482 pr_err("IP-Config: Incomplete network configuration information\n");
1483 ic_close_devs();
1484 return -1;
1485#endif /* IPCONFIG_DYNAMIC */
1486 } else {
1487 /* Device selected manually or only one device -> use it */
1488 ic_dev = ic_first_dev->dev;
1489 }
1490
1491 addr = root_nfs_parse_addr(root_server_path);
1492 if (root_server_addr == NONE)
1493 root_server_addr = addr;
1494
1495 /*
1496 * Use defaults wherever applicable.
1497 */
1498 if (ic_defaults() < 0)
1499 return -1;
1500
1501 /*
1502 * Close all network devices except the device we've
1503 * autoconfigured and set up routes.
1504 */
1505 ic_close_devs();
1506 if (ic_setup_if() < 0 || ic_setup_routes() < 0)
1507 return -1;
1508
1509 /*
1510 * Record which protocol was actually used.
1511 */
1512#ifdef IPCONFIG_DYNAMIC
1513 ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP);
1514#endif
1515
1516#ifndef IPCONFIG_SILENT
1517 /*
1518 * Clue in the operator.
1519 */
1520 pr_info("IP-Config: Complete:\n");
1521
1522 pr_info(" device=%s, hwaddr=%*phC, ipaddr=%pI4, mask=%pI4, gw=%pI4\n",
1523 ic_dev->name, ic_dev->addr_len, ic_dev->dev_addr,
1524 &ic_myaddr, &ic_netmask, &ic_gateway);
1525 pr_info(" host=%s, domain=%s, nis-domain=%s\n",
1526 utsname()->nodename, ic_domain, utsname()->domainname);
1527 pr_info(" bootserver=%pI4, rootserver=%pI4, rootpath=%s",
1528 &ic_servaddr, &root_server_addr, root_server_path);
1529 if (ic_dev_mtu)
1530 pr_cont(", mtu=%d", ic_dev_mtu);
1531 for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
1532 if (ic_nameservers[i] != NONE) {
1533 pr_cont(" nameserver%u=%pI4",
1534 i, &ic_nameservers[i]);
1535 break;
1536 }
1537 for (i++; i < CONF_NAMESERVERS_MAX; i++)
1538 if (ic_nameservers[i] != NONE)
1539 pr_cont(", nameserver%u=%pI4", i, &ic_nameservers[i]);
1540 pr_cont("\n");
1541#endif /* !SILENT */
1542
1543 return 0;
1544}
1545
1546late_initcall(ip_auto_config);
1547
1548
1549/*
1550 * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
1551 * command line parameter. See Documentation/filesystems/nfs/nfsroot.txt.
1552 */
1553static int __init ic_proto_name(char *name)
1554{
1555 if (!strcmp(name, "on") || !strcmp(name, "any")) {
1556 return 1;
1557 }
1558 if (!strcmp(name, "off") || !strcmp(name, "none")) {
1559 return 0;
1560 }
1561#ifdef CONFIG_IP_PNP_DHCP
1562 else if (!strncmp(name, "dhcp", 4)) {
1563 char *client_id;
1564
1565 ic_proto_enabled &= ~IC_RARP;
1566 client_id = strstr(name, "dhcp,");
1567 if (client_id) {
1568 char *v;
1569
1570 client_id = client_id + 5;
1571 v = strchr(client_id, ',');
1572 if (!v)
1573 return 1;
1574 *v = 0;
1575 if (kstrtou8(client_id, 0, dhcp_client_identifier))
1576 pr_debug("DHCP: Invalid client identifier type\n");
1577 strncpy(dhcp_client_identifier + 1, v + 1, 251);
1578 *v = ',';
1579 }
1580 return 1;
1581 }
1582#endif
1583#ifdef CONFIG_IP_PNP_BOOTP
1584 else if (!strcmp(name, "bootp")) {
1585 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP);
1586 return 1;
1587 }
1588#endif
1589#ifdef CONFIG_IP_PNP_RARP
1590 else if (!strcmp(name, "rarp")) {
1591 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP);
1592 return 1;
1593 }
1594#endif
1595#ifdef IPCONFIG_DYNAMIC
1596 else if (!strcmp(name, "both")) {
1597 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */
1598 return 1;
1599 }
1600#endif
1601 return 0;
1602}
1603
1604static int __init ip_auto_config_setup(char *addrs)
1605{
1606 char *cp, *ip, *dp;
1607 int num = 0;
1608
1609 ic_set_manually = 1;
1610 ic_enable = 1;
1611
1612 /*
1613 * If any dhcp, bootp etc options are set, leave autoconfig on
1614 * and skip the below static IP processing.
1615 */
1616 if (ic_proto_name(addrs))
1617 return 1;
1618
1619 /* If no static IP is given, turn off autoconfig and bail. */
1620 if (*addrs == 0 ||
1621 strcmp(addrs, "off") == 0 ||
1622 strcmp(addrs, "none") == 0) {
1623 ic_enable = 0;
1624 return 1;
1625 }
1626
1627 ic_nameservers_predef();
1628
1629 /* Parse string for static IP assignment. */
1630 ip = addrs;
1631 while (ip && *ip) {
1632 if ((cp = strchr(ip, ':')))
1633 *cp++ = '\0';
1634 if (strlen(ip) > 0) {
1635 pr_debug("IP-Config: Parameter #%d: `%s'\n", num, ip);
1636 switch (num) {
1637 case 0:
1638 if ((ic_myaddr = in_aton(ip)) == ANY)
1639 ic_myaddr = NONE;
1640 break;
1641 case 1:
1642 if ((ic_servaddr = in_aton(ip)) == ANY)
1643 ic_servaddr = NONE;
1644 break;
1645 case 2:
1646 if ((ic_gateway = in_aton(ip)) == ANY)
1647 ic_gateway = NONE;
1648 break;
1649 case 3:
1650 if ((ic_netmask = in_aton(ip)) == ANY)
1651 ic_netmask = NONE;
1652 break;
1653 case 4:
1654 if ((dp = strchr(ip, '.'))) {
1655 *dp++ = '\0';
1656 strlcpy(utsname()->domainname, dp,
1657 sizeof(utsname()->domainname));
1658 }
1659 strlcpy(utsname()->nodename, ip,
1660 sizeof(utsname()->nodename));
1661 ic_host_name_set = 1;
1662 break;
1663 case 5:
1664 strlcpy(user_dev_name, ip, sizeof(user_dev_name));
1665 break;
1666 case 6:
1667 if (ic_proto_name(ip) == 0 &&
1668 ic_myaddr == NONE) {
1669 ic_enable = 0;
1670 }
1671 break;
1672 case 7:
1673 if (CONF_NAMESERVERS_MAX >= 1) {
1674 ic_nameservers[0] = in_aton(ip);
1675 if (ic_nameservers[0] == ANY)
1676 ic_nameservers[0] = NONE;
1677 }
1678 break;
1679 case 8:
1680 if (CONF_NAMESERVERS_MAX >= 2) {
1681 ic_nameservers[1] = in_aton(ip);
1682 if (ic_nameservers[1] == ANY)
1683 ic_nameservers[1] = NONE;
1684 }
1685 break;
1686 }
1687 }
1688 ip = cp;
1689 num++;
1690 }
1691
1692 return 1;
1693}
1694__setup("ip=", ip_auto_config_setup);
1695
1696static int __init nfsaddrs_config_setup(char *addrs)
1697{
1698 return ip_auto_config_setup(addrs);
1699}
1700__setup("nfsaddrs=", nfsaddrs_config_setup);
1701
1702static int __init vendor_class_identifier_setup(char *addrs)
1703{
1704 if (strlcpy(vendor_class_identifier, addrs,
1705 sizeof(vendor_class_identifier))
1706 >= sizeof(vendor_class_identifier))
1707 pr_warn("DHCP: vendorclass too long, truncated to \"%s\"\n",
1708 vendor_class_identifier);
1709 return 1;
1710}
1711__setup("dhcpclass=", vendor_class_identifier_setup);