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33#include <linux/types.h>
34#include <linux/string.h>
35#include <linux/kernel.h>
36#include <linux/jiffies.h>
37#include <linux/random.h>
38#include <linux/init.h>
39#include <linux/utsname.h>
40#include <linux/in.h>
41#include <linux/if.h>
42#include <linux/inet.h>
43#include <linux/inetdevice.h>
44#include <linux/netdevice.h>
45#include <linux/if_arp.h>
46#include <linux/skbuff.h>
47#include <linux/ip.h>
48#include <linux/socket.h>
49#include <linux/route.h>
50#include <linux/udp.h>
51#include <linux/proc_fs.h>
52#include <linux/seq_file.h>
53#include <linux/major.h>
54#include <linux/root_dev.h>
55#include <linux/delay.h>
56#include <linux/nfs_fs.h>
57#include <linux/slab.h>
58#include <linux/export.h>
59#include <net/net_namespace.h>
60#include <net/arp.h>
61#include <net/dsa.h>
62#include <net/ip.h>
63#include <net/ipconfig.h>
64#include <net/route.h>
65
66#include <linux/uaccess.h>
67#include <net/checksum.h>
68#include <asm/processor.h>
69
70#if defined(CONFIG_IP_PNP_DHCP)
71#define IPCONFIG_DHCP
72#endif
73#if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_DHCP)
74#define IPCONFIG_BOOTP
75#endif
76#if defined(CONFIG_IP_PNP_RARP)
77#define IPCONFIG_RARP
78#endif
79#if defined(IPCONFIG_BOOTP) || defined(IPCONFIG_RARP)
80#define IPCONFIG_DYNAMIC
81#endif
82
83
84#define CONF_POST_OPEN 10
85#define CONF_CARRIER_TIMEOUT 120000
86
87
88#define CONF_OPEN_RETRIES 2
89#define CONF_SEND_RETRIES 6
90#define CONF_BASE_TIMEOUT (HZ*2)
91#define CONF_TIMEOUT_RANDOM (HZ)
92#define CONF_TIMEOUT_MULT *7/4
93#define CONF_TIMEOUT_MAX (HZ*30)
94#define CONF_NAMESERVERS_MAX 3
95
96
97#define NONE cpu_to_be32(INADDR_NONE)
98#define ANY cpu_to_be32(INADDR_ANY)
99
100
101
102
103
104
105
106
107
108int ic_set_manually __initdata = 0;
109
110static int ic_enable __initdata;
111
112
113int ic_proto_enabled __initdata = 0
114#ifdef IPCONFIG_BOOTP
115 | IC_BOOTP
116#endif
117#ifdef CONFIG_IP_PNP_DHCP
118 | IC_USE_DHCP
119#endif
120#ifdef IPCONFIG_RARP
121 | IC_RARP
122#endif
123 ;
124
125static int ic_host_name_set __initdata;
126
127__be32 ic_myaddr = NONE;
128static __be32 ic_netmask = NONE;
129__be32 ic_gateway = NONE;
130
131#ifdef IPCONFIG_DYNAMIC
132static __be32 ic_addrservaddr = NONE;
133#endif
134
135__be32 ic_servaddr = NONE;
136
137__be32 root_server_addr = NONE;
138u8 root_server_path[256] = { 0, };
139
140
141static char vendor_class_identifier[253] __initdata;
142
143#if defined(CONFIG_IP_PNP_DHCP)
144static char dhcp_client_identifier[253] __initdata;
145#endif
146
147
148
149#ifdef IPCONFIG_DYNAMIC
150static int ic_proto_used;
151#else
152#define ic_proto_used 0
153#endif
154static __be32 ic_nameservers[CONF_NAMESERVERS_MAX];
155static u8 ic_domain[64];
156
157
158
159
160
161
162static char user_dev_name[IFNAMSIZ] __initdata = { 0, };
163
164
165static int ic_proto_have_if __initdata;
166
167
168static int ic_dev_mtu __initdata;
169
170#ifdef IPCONFIG_DYNAMIC
171static DEFINE_SPINLOCK(ic_recv_lock);
172static volatile int ic_got_reply __initdata;
173#endif
174#ifdef IPCONFIG_DHCP
175static int ic_dhcp_msgtype __initdata;
176#endif
177
178
179
180
181
182
183struct ic_device {
184 struct ic_device *next;
185 struct net_device *dev;
186 unsigned short flags;
187 short able;
188 __be32 xid;
189};
190
191static struct ic_device *ic_first_dev __initdata;
192static struct ic_device *ic_dev __initdata;
193
194static bool __init ic_is_init_dev(struct net_device *dev)
195{
196 if (dev->flags & IFF_LOOPBACK)
197 return false;
198 return user_dev_name[0] ? !strcmp(dev->name, user_dev_name) :
199 (!(dev->flags & IFF_LOOPBACK) &&
200 (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) &&
201 strncmp(dev->name, "dummy", 5));
202}
203
204static int __init ic_open_devs(void)
205{
206 struct ic_device *d, **last;
207 struct net_device *dev;
208 unsigned short oflags;
209 unsigned long start, next_msg;
210
211 last = &ic_first_dev;
212 rtnl_lock();
213
214
215 for_each_netdev(&init_net, dev) {
216 if (!(dev->flags & IFF_LOOPBACK) && !netdev_uses_dsa(dev))
217 continue;
218 if (dev_change_flags(dev, dev->flags | IFF_UP) < 0)
219 pr_err("IP-Config: Failed to open %s\n", dev->name);
220 }
221
222 for_each_netdev(&init_net, dev) {
223 if (ic_is_init_dev(dev)) {
224 int able = 0;
225 if (dev->mtu >= 364)
226 able |= IC_BOOTP;
227 else
228 pr_warn("DHCP/BOOTP: Ignoring device %s, MTU %d too small\n",
229 dev->name, dev->mtu);
230 if (!(dev->flags & IFF_NOARP))
231 able |= IC_RARP;
232 able &= ic_proto_enabled;
233 if (ic_proto_enabled && !able)
234 continue;
235 oflags = dev->flags;
236 if (dev_change_flags(dev, oflags | IFF_UP) < 0) {
237 pr_err("IP-Config: Failed to open %s\n",
238 dev->name);
239 continue;
240 }
241 if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) {
242 rtnl_unlock();
243 return -ENOMEM;
244 }
245 d->dev = dev;
246 *last = d;
247 last = &d->next;
248 d->flags = oflags;
249 d->able = able;
250 if (able & IC_BOOTP)
251 get_random_bytes(&d->xid, sizeof(__be32));
252 else
253 d->xid = 0;
254 ic_proto_have_if |= able;
255 pr_debug("IP-Config: %s UP (able=%d, xid=%08x)\n",
256 dev->name, able, d->xid);
257 }
258 }
259
260
261 if (!ic_first_dev)
262 goto have_carrier;
263
264
265 start = jiffies;
266 next_msg = start + msecs_to_jiffies(CONF_CARRIER_TIMEOUT/12);
267 while (time_before(jiffies, start +
268 msecs_to_jiffies(CONF_CARRIER_TIMEOUT))) {
269 int wait, elapsed;
270
271 for_each_netdev(&init_net, dev)
272 if (ic_is_init_dev(dev) && netif_carrier_ok(dev))
273 goto have_carrier;
274
275 msleep(1);
276
277 if (time_before(jiffies, next_msg))
278 continue;
279
280 elapsed = jiffies_to_msecs(jiffies - start);
281 wait = (CONF_CARRIER_TIMEOUT - elapsed + 500)/1000;
282 pr_info("Waiting up to %d more seconds for network.\n", wait);
283 next_msg = jiffies + msecs_to_jiffies(CONF_CARRIER_TIMEOUT/12);
284 }
285have_carrier:
286 rtnl_unlock();
287
288 *last = NULL;
289
290 if (!ic_first_dev) {
291 if (user_dev_name[0])
292 pr_err("IP-Config: Device `%s' not found\n",
293 user_dev_name);
294 else
295 pr_err("IP-Config: No network devices available\n");
296 return -ENODEV;
297 }
298 return 0;
299}
300
301static void __init ic_close_devs(void)
302{
303 struct ic_device *d, *next;
304 struct net_device *dev;
305
306 rtnl_lock();
307 next = ic_first_dev;
308 while ((d = next)) {
309 next = d->next;
310 dev = d->dev;
311 if (d != ic_dev && !netdev_uses_dsa(dev)) {
312 pr_debug("IP-Config: Downing %s\n", dev->name);
313 dev_change_flags(dev, d->flags);
314 }
315 kfree(d);
316 }
317 rtnl_unlock();
318}
319
320
321
322
323
324static inline void
325set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port)
326{
327 sin->sin_family = AF_INET;
328 sin->sin_addr.s_addr = addr;
329 sin->sin_port = port;
330}
331
332
333
334
335
336static int __init ic_setup_if(void)
337{
338 struct ifreq ir;
339 struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr;
340 int err;
341
342 memset(&ir, 0, sizeof(ir));
343 strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->dev->name);
344 set_sockaddr(sin, ic_myaddr, 0);
345 if ((err = devinet_ioctl(&init_net, SIOCSIFADDR, &ir)) < 0) {
346 pr_err("IP-Config: Unable to set interface address (%d)\n",
347 err);
348 return -1;
349 }
350 set_sockaddr(sin, ic_netmask, 0);
351 if ((err = devinet_ioctl(&init_net, SIOCSIFNETMASK, &ir)) < 0) {
352 pr_err("IP-Config: Unable to set interface netmask (%d)\n",
353 err);
354 return -1;
355 }
356 set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0);
357 if ((err = devinet_ioctl(&init_net, SIOCSIFBRDADDR, &ir)) < 0) {
358 pr_err("IP-Config: Unable to set interface broadcast address (%d)\n",
359 err);
360 return -1;
361 }
362
363
364
365
366 if (ic_dev_mtu != 0) {
367 rtnl_lock();
368 if ((err = dev_set_mtu(ic_dev->dev, ic_dev_mtu)) < 0)
369 pr_err("IP-Config: Unable to set interface mtu to %d (%d)\n",
370 ic_dev_mtu, err);
371 rtnl_unlock();
372 }
373 return 0;
374}
375
376static int __init ic_setup_routes(void)
377{
378
379
380 if (ic_gateway != NONE) {
381 struct rtentry rm;
382 int err;
383
384 memset(&rm, 0, sizeof(rm));
385 if ((ic_gateway ^ ic_myaddr) & ic_netmask) {
386 pr_err("IP-Config: Gateway not on directly connected network\n");
387 return -1;
388 }
389 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0);
390 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0);
391 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0);
392 rm.rt_flags = RTF_UP | RTF_GATEWAY;
393 if ((err = ip_rt_ioctl(&init_net, SIOCADDRT, &rm)) < 0) {
394 pr_err("IP-Config: Cannot add default route (%d)\n",
395 err);
396 return -1;
397 }
398 }
399
400 return 0;
401}
402
403
404
405
406
407static int __init ic_defaults(void)
408{
409
410
411
412
413
414 if (!ic_host_name_set)
415 sprintf(init_utsname()->nodename, "%pI4", &ic_myaddr);
416
417 if (root_server_addr == NONE)
418 root_server_addr = ic_servaddr;
419
420 if (ic_netmask == NONE) {
421 if (IN_CLASSA(ntohl(ic_myaddr)))
422 ic_netmask = htonl(IN_CLASSA_NET);
423 else if (IN_CLASSB(ntohl(ic_myaddr)))
424 ic_netmask = htonl(IN_CLASSB_NET);
425 else if (IN_CLASSC(ntohl(ic_myaddr)))
426 ic_netmask = htonl(IN_CLASSC_NET);
427 else {
428 pr_err("IP-Config: Unable to guess netmask for address %pI4\n",
429 &ic_myaddr);
430 return -1;
431 }
432 pr_notice("IP-Config: Guessing netmask %pI4\n",
433 &ic_netmask);
434 }
435
436 return 0;
437}
438
439
440
441
442
443#ifdef IPCONFIG_RARP
444
445static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
446
447static struct packet_type rarp_packet_type __initdata = {
448 .type = cpu_to_be16(ETH_P_RARP),
449 .func = ic_rarp_recv,
450};
451
452static inline void __init ic_rarp_init(void)
453{
454 dev_add_pack(&rarp_packet_type);
455}
456
457static inline void __init ic_rarp_cleanup(void)
458{
459 dev_remove_pack(&rarp_packet_type);
460}
461
462
463
464
465static int __init
466ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
467{
468 struct arphdr *rarp;
469 unsigned char *rarp_ptr;
470 __be32 sip, tip;
471 unsigned char *tha;
472 struct ic_device *d;
473
474 if (!net_eq(dev_net(dev), &init_net))
475 goto drop;
476
477 skb = skb_share_check(skb, GFP_ATOMIC);
478 if (!skb)
479 return NET_RX_DROP;
480
481 if (!pskb_may_pull(skb, sizeof(struct arphdr)))
482 goto drop;
483
484
485 rarp = (struct arphdr *)skb_transport_header(skb);
486
487
488
489
490 if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd))
491 goto drop;
492
493
494 if (rarp->ar_op != htons(ARPOP_RREPLY))
495 goto drop;
496
497
498 if (rarp->ar_pro != htons(ETH_P_IP))
499 goto drop;
500
501 if (!pskb_may_pull(skb, arp_hdr_len(dev)))
502 goto drop;
503
504
505 rarp = (struct arphdr *)skb_transport_header(skb);
506 rarp_ptr = (unsigned char *) (rarp + 1);
507
508
509 spin_lock(&ic_recv_lock);
510
511
512 if (ic_got_reply)
513 goto drop_unlock;
514
515
516 d = ic_first_dev;
517 while (d && d->dev != dev)
518 d = d->next;
519 if (!d)
520 goto drop_unlock;
521
522
523 rarp_ptr += dev->addr_len;
524 memcpy(&sip, rarp_ptr, 4);
525 rarp_ptr += 4;
526 tha = rarp_ptr;
527 rarp_ptr += dev->addr_len;
528 memcpy(&tip, rarp_ptr, 4);
529
530
531 if (memcmp(tha, dev->dev_addr, dev->addr_len))
532 goto drop_unlock;
533
534
535 if (ic_servaddr != NONE && ic_servaddr != sip)
536 goto drop_unlock;
537
538
539 ic_dev = d;
540 if (ic_myaddr == NONE)
541 ic_myaddr = tip;
542 ic_servaddr = sip;
543 ic_addrservaddr = sip;
544 ic_got_reply = IC_RARP;
545
546drop_unlock:
547
548 spin_unlock(&ic_recv_lock);
549
550drop:
551
552 kfree_skb(skb);
553 return 0;
554}
555
556
557
558
559
560static void __init ic_rarp_send_if(struct ic_device *d)
561{
562 struct net_device *dev = d->dev;
563 arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL,
564 dev->dev_addr, dev->dev_addr);
565}
566#endif
567
568
569
570
571static inline void __init ic_nameservers_predef(void)
572{
573 int i;
574
575 for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
576 ic_nameservers[i] = NONE;
577}
578
579
580
581
582
583#ifdef IPCONFIG_BOOTP
584
585struct bootp_pkt {
586 struct iphdr iph;
587 struct udphdr udph;
588 u8 op;
589 u8 htype;
590 u8 hlen;
591 u8 hops;
592 __be32 xid;
593 __be16 secs;
594 __be16 flags;
595 __be32 client_ip;
596 __be32 your_ip;
597 __be32 server_ip;
598 __be32 relay_ip;
599 u8 hw_addr[16];
600 u8 serv_name[64];
601 u8 boot_file[128];
602 u8 exten[312];
603};
604
605
606#define BOOTP_REQUEST 1
607#define BOOTP_REPLY 2
608
609
610#define DHCPDISCOVER 1
611#define DHCPOFFER 2
612#define DHCPREQUEST 3
613#define DHCPDECLINE 4
614#define DHCPACK 5
615#define DHCPNAK 6
616#define DHCPRELEASE 7
617#define DHCPINFORM 8
618
619static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
620
621static struct packet_type bootp_packet_type __initdata = {
622 .type = cpu_to_be16(ETH_P_IP),
623 .func = ic_bootp_recv,
624};
625
626
627
628
629
630static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 };
631
632#ifdef IPCONFIG_DHCP
633
634static void __init
635ic_dhcp_init_options(u8 *options, struct ic_device *d)
636{
637 u8 mt = ((ic_servaddr == NONE)
638 ? DHCPDISCOVER : DHCPREQUEST);
639 u8 *e = options;
640 int len;
641
642 pr_debug("DHCP: Sending message type %d (%s)\n", mt, d->dev->name);
643
644 memcpy(e, ic_bootp_cookie, 4);
645 e += 4;
646
647 *e++ = 53;
648 *e++ = 1;
649 *e++ = mt;
650
651 if (mt == DHCPREQUEST) {
652 *e++ = 54;
653 *e++ = 4;
654 memcpy(e, &ic_servaddr, 4);
655 e += 4;
656
657 *e++ = 50;
658 *e++ = 4;
659 memcpy(e, &ic_myaddr, 4);
660 e += 4;
661 }
662
663
664 {
665 static const u8 ic_req_params[] = {
666 1,
667 3,
668 6,
669 12,
670 15,
671 17,
672 26,
673 40,
674 };
675
676 *e++ = 55;
677 *e++ = sizeof(ic_req_params);
678 memcpy(e, ic_req_params, sizeof(ic_req_params));
679 e += sizeof(ic_req_params);
680
681 if (ic_host_name_set) {
682 *e++ = 12;
683 len = strlen(utsname()->nodename);
684 *e++ = len;
685 memcpy(e, utsname()->nodename, len);
686 e += len;
687 }
688 if (*vendor_class_identifier) {
689 pr_info("DHCP: sending class identifier \"%s\"\n",
690 vendor_class_identifier);
691 *e++ = 60;
692 len = strlen(vendor_class_identifier);
693 *e++ = len;
694 memcpy(e, vendor_class_identifier, len);
695 e += len;
696 }
697 len = strlen(dhcp_client_identifier + 1);
698
699
700
701 if (len >= 1 && len < 312 - (e - options) - 1) {
702 *e++ = 61;
703 *e++ = len + 1;
704 memcpy(e, dhcp_client_identifier, len + 1);
705 e += len + 1;
706 }
707 }
708
709 *e++ = 255;
710}
711
712#endif
713
714static void __init ic_bootp_init_ext(u8 *e)
715{
716 memcpy(e, ic_bootp_cookie, 4);
717 e += 4;
718 *e++ = 1;
719 *e++ = 4;
720 e += 4;
721 *e++ = 3;
722 *e++ = 4;
723 e += 4;
724 *e++ = 5;
725 *e++ = 8;
726 e += 8;
727 *e++ = 12;
728 *e++ = 32;
729 e += 32;
730 *e++ = 40;
731 *e++ = 32;
732 e += 32;
733 *e++ = 17;
734 *e++ = 40;
735 e += 40;
736
737 *e++ = 57;
738 *e++ = 2;
739 *e++ = 1;
740 *e++ = 150;
741
742 *e++ = 255;
743}
744
745
746
747
748
749static inline void __init ic_bootp_init(void)
750{
751 ic_nameservers_predef();
752
753 dev_add_pack(&bootp_packet_type);
754}
755
756
757
758
759
760static inline void __init ic_bootp_cleanup(void)
761{
762 dev_remove_pack(&bootp_packet_type);
763}
764
765
766
767
768
769static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff)
770{
771 struct net_device *dev = d->dev;
772 struct sk_buff *skb;
773 struct bootp_pkt *b;
774 struct iphdr *h;
775 int hlen = LL_RESERVED_SPACE(dev);
776 int tlen = dev->needed_tailroom;
777
778
779 skb = alloc_skb(sizeof(struct bootp_pkt) + hlen + tlen + 15,
780 GFP_KERNEL);
781 if (!skb)
782 return;
783 skb_reserve(skb, hlen);
784 b = skb_put_zero(skb, sizeof(struct bootp_pkt));
785
786
787 skb_reset_network_header(skb);
788 h = ip_hdr(skb);
789 h->version = 4;
790 h->ihl = 5;
791 h->tot_len = htons(sizeof(struct bootp_pkt));
792 h->frag_off = htons(IP_DF);
793 h->ttl = 64;
794 h->protocol = IPPROTO_UDP;
795 h->daddr = htonl(INADDR_BROADCAST);
796 h->check = ip_fast_csum((unsigned char *) h, h->ihl);
797
798
799 b->udph.source = htons(68);
800 b->udph.dest = htons(67);
801 b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr));
802
803
804
805 b->op = BOOTP_REQUEST;
806 if (dev->type < 256)
807 b->htype = dev->type;
808 else if (dev->type == ARPHRD_FDDI)
809 b->htype = ARPHRD_ETHER;
810 else {
811 pr_warn("Unknown ARP type 0x%04x for device %s\n", dev->type,
812 dev->name);
813 b->htype = dev->type;
814 }
815
816
817 b->hlen = dev->addr_len;
818 memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
819 b->secs = htons(jiffies_diff / HZ);
820 b->xid = d->xid;
821
822
823#ifdef IPCONFIG_DHCP
824 if (ic_proto_enabled & IC_USE_DHCP)
825 ic_dhcp_init_options(b->exten, d);
826 else
827#endif
828 ic_bootp_init_ext(b->exten);
829
830
831 skb->dev = dev;
832 skb->protocol = htons(ETH_P_IP);
833 if (dev_hard_header(skb, dev, ntohs(skb->protocol),
834 dev->broadcast, dev->dev_addr, skb->len) < 0) {
835 kfree_skb(skb);
836 printk("E");
837 return;
838 }
839
840 if (dev_queue_xmit(skb) < 0)
841 printk("E");
842}
843
844
845
846
847
848static int __init ic_bootp_string(char *dest, char *src, int len, int max)
849{
850 if (!len)
851 return 0;
852 if (len > max-1)
853 len = max-1;
854 memcpy(dest, src, len);
855 dest[len] = '\0';
856 return 1;
857}
858
859
860
861
862
863static void __init ic_do_bootp_ext(u8 *ext)
864{
865 u8 servers;
866 int i;
867 __be16 mtu;
868
869 u8 *c;
870
871 pr_debug("DHCP/BOOTP: Got extension %d:", *ext);
872 for (c=ext+2; c<ext+2+ext[1]; c++)
873 pr_debug(" %02x", *c);
874 pr_debug("\n");
875
876 switch (*ext++) {
877 case 1:
878 if (ic_netmask == NONE)
879 memcpy(&ic_netmask, ext+1, 4);
880 break;
881 case 3:
882 if (ic_gateway == NONE)
883 memcpy(&ic_gateway, ext+1, 4);
884 break;
885 case 6:
886 servers= *ext/4;
887 if (servers > CONF_NAMESERVERS_MAX)
888 servers = CONF_NAMESERVERS_MAX;
889 for (i = 0; i < servers; i++) {
890 if (ic_nameservers[i] == NONE)
891 memcpy(&ic_nameservers[i], ext+1+4*i, 4);
892 }
893 break;
894 case 12:
895 ic_bootp_string(utsname()->nodename, ext+1, *ext,
896 __NEW_UTS_LEN);
897 ic_host_name_set = 1;
898 break;
899 case 15:
900 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
901 break;
902 case 17:
903 if (!root_server_path[0])
904 ic_bootp_string(root_server_path, ext+1, *ext,
905 sizeof(root_server_path));
906 break;
907 case 26:
908 memcpy(&mtu, ext+1, sizeof(mtu));
909 ic_dev_mtu = ntohs(mtu);
910 break;
911 case 40:
912 ic_bootp_string(utsname()->domainname, ext+1, *ext,
913 __NEW_UTS_LEN);
914 break;
915 }
916}
917
918
919
920
921
922static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
923{
924 struct bootp_pkt *b;
925 struct iphdr *h;
926 struct ic_device *d;
927 int len, ext_len;
928
929 if (!net_eq(dev_net(dev), &init_net))
930 goto drop;
931
932
933 if (skb->pkt_type == PACKET_OTHERHOST)
934 goto drop;
935
936 skb = skb_share_check(skb, GFP_ATOMIC);
937 if (!skb)
938 return NET_RX_DROP;
939
940 if (!pskb_may_pull(skb,
941 sizeof(struct iphdr) +
942 sizeof(struct udphdr)))
943 goto drop;
944
945 b = (struct bootp_pkt *)skb_network_header(skb);
946 h = &b->iph;
947
948 if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP)
949 goto drop;
950
951
952 if (ip_is_fragment(h)) {
953 net_err_ratelimited("DHCP/BOOTP: Ignoring fragmented reply\n");
954 goto drop;
955 }
956
957 if (skb->len < ntohs(h->tot_len))
958 goto drop;
959
960 if (ip_fast_csum((char *) h, h->ihl))
961 goto drop;
962
963 if (b->udph.source != htons(67) || b->udph.dest != htons(68))
964 goto drop;
965
966 if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
967 goto drop;
968
969 len = ntohs(b->udph.len) - sizeof(struct udphdr);
970 ext_len = len - (sizeof(*b) -
971 sizeof(struct iphdr) -
972 sizeof(struct udphdr) -
973 sizeof(b->exten));
974 if (ext_len < 0)
975 goto drop;
976
977
978 if (!pskb_may_pull(skb, skb->len))
979 goto drop;
980
981 b = (struct bootp_pkt *)skb_network_header(skb);
982 h = &b->iph;
983
984
985 spin_lock(&ic_recv_lock);
986
987
988 if (ic_got_reply)
989 goto drop_unlock;
990
991
992 d = ic_first_dev;
993 while (d && d->dev != dev)
994 d = d->next;
995 if (!d)
996 goto drop_unlock;
997
998
999 if (b->op != BOOTP_REPLY ||
1000 b->xid != d->xid) {
1001 net_err_ratelimited("DHCP/BOOTP: Reply not for us on %s, op[%x] xid[%x]\n",
1002 d->dev->name, b->op, b->xid);
1003 goto drop_unlock;
1004 }
1005
1006
1007 if (ext_len >= 4 &&
1008 !memcmp(b->exten, ic_bootp_cookie, 4)) {
1009 u8 *end = (u8 *) b + ntohs(b->iph.tot_len);
1010 u8 *ext;
1011
1012#ifdef IPCONFIG_DHCP
1013 if (ic_proto_enabled & IC_USE_DHCP) {
1014 __be32 server_id = NONE;
1015 int mt = 0;
1016
1017 ext = &b->exten[4];
1018 while (ext < end && *ext != 0xff) {
1019 u8 *opt = ext++;
1020 if (*opt == 0)
1021 continue;
1022 ext += *ext + 1;
1023 if (ext >= end)
1024 break;
1025 switch (*opt) {
1026 case 53:
1027 if (opt[1])
1028 mt = opt[2];
1029 break;
1030 case 54:
1031 if (opt[1] >= 4)
1032 memcpy(&server_id, opt + 2, 4);
1033 break;
1034 }
1035 }
1036
1037 pr_debug("DHCP: Got message type %d (%s)\n", mt, d->dev->name);
1038
1039 switch (mt) {
1040 case DHCPOFFER:
1041
1042
1043
1044 if (ic_myaddr != NONE)
1045 goto drop_unlock;
1046
1047
1048 ic_myaddr = b->your_ip;
1049 ic_servaddr = server_id;
1050 pr_debug("DHCP: Offered address %pI4 by server %pI4\n",
1051 &ic_myaddr, &b->iph.saddr);
1052
1053
1054
1055
1056 if ((server_id != NONE) &&
1057 (b->server_ip != server_id))
1058 b->server_ip = ic_servaddr;
1059 break;
1060
1061 case DHCPACK:
1062 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0)
1063 goto drop_unlock;
1064
1065
1066 break;
1067
1068 default:
1069
1070 ic_myaddr = NONE;
1071 ic_servaddr = NONE;
1072 goto drop_unlock;
1073 }
1074
1075 ic_dhcp_msgtype = mt;
1076
1077 }
1078#endif
1079
1080 ext = &b->exten[4];
1081 while (ext < end && *ext != 0xff) {
1082 u8 *opt = ext++;
1083 if (*opt == 0)
1084 continue;
1085 ext += *ext + 1;
1086 if (ext < end)
1087 ic_do_bootp_ext(opt);
1088 }
1089 }
1090
1091
1092 ic_dev = d;
1093 ic_myaddr = b->your_ip;
1094 ic_servaddr = b->server_ip;
1095 ic_addrservaddr = b->iph.saddr;
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
1104 spin_unlock(&ic_recv_lock);
1105
1106drop:
1107
1108 kfree_skb(skb);
1109
1110 return 0;
1111}
1112
1113
1114#endif
1115
1116
1117
1118
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
1133
1134
1135
1136 if (!ic_proto_enabled) {
1137 pr_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 pr_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 pr_err("RARP: No suitable device found\n");
1148#endif
1149
1150 if (!ic_proto_have_if)
1151
1152 return -1;
1153
1154
1155
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
1168
1169
1170
1171
1172
1173
1174 pr_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 int) CONF_TIMEOUT_RANDOM);
1185 for (;;) {
1186#ifdef IPCONFIG_BOOTP
1187 if (do_bootp && (d->able & IC_BOOTP))
1188 ic_bootp_send_if(d, jiffies - start_jiffies);
1189#endif
1190#ifdef IPCONFIG_RARP
1191 if (do_rarp && (d->able & IC_RARP))
1192 ic_rarp_send_if(d);
1193#endif
1194
1195 if (!d->next) {
1196 jiff = jiffies + timeout;
1197 while (time_before(jiffies, jiff) && !ic_got_reply)
1198 schedule_timeout_uninterruptible(1);
1199 }
1200#ifdef IPCONFIG_DHCP
1201
1202 if ((ic_got_reply & IC_BOOTP) &&
1203 (ic_proto_enabled & IC_USE_DHCP) &&
1204 ic_dhcp_msgtype != DHCPACK) {
1205 ic_got_reply = 0;
1206
1207 d = ic_dev;
1208 pr_cont(",");
1209 continue;
1210 }
1211#endif
1212
1213 if (ic_got_reply) {
1214 pr_cont(" OK\n");
1215 break;
1216 }
1217
1218 if ((d = d->next))
1219 continue;
1220
1221 if (! --retries) {
1222 pr_cont(" timed out!\n");
1223 break;
1224 }
1225
1226 d = ic_first_dev;
1227
1228 timeout = timeout CONF_TIMEOUT_MULT;
1229 if (timeout > CONF_TIMEOUT_MAX)
1230 timeout = CONF_TIMEOUT_MAX;
1231
1232 pr_cont(".");
1233 }
1234
1235#ifdef IPCONFIG_BOOTP
1236 if (do_bootp)
1237 ic_bootp_cleanup();
1238#endif
1239#ifdef IPCONFIG_RARP
1240 if (do_rarp)
1241 ic_rarp_cleanup();
1242#endif
1243
1244 if (!ic_got_reply) {
1245 ic_myaddr = NONE;
1246 return -1;
1247 }
1248
1249 pr_info("IP-Config: Got %s answer from %pI4, my address is %pI4\n",
1250 ((ic_got_reply & IC_RARP) ? "RARP"
1251 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),
1252 &ic_addrservaddr, &ic_myaddr);
1253
1254 return 0;
1255}
1256
1257#endif
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 .open = pnp_seq_open,
1293 .read = seq_read,
1294 .llseek = seq_lseek,
1295 .release = single_release,
1296};
1297#endif
1298
1299
1300
1301
1302
1303
1304__be32 __init root_nfs_parse_addr(char *name)
1305{
1306 __be32 addr;
1307 int octets = 0;
1308 char *cp, *cq;
1309
1310 cp = cq = name;
1311 while (octets < 4) {
1312 while (*cp >= '0' && *cp <= '9')
1313 cp++;
1314 if (cp == cq || cp - cq > 3)
1315 break;
1316 if (*cp == '.' || octets == 3)
1317 octets++;
1318 if (octets < 4)
1319 cp++;
1320 cq = cp;
1321 }
1322 if (octets == 4 && (*cp == ':' || *cp == '\0')) {
1323 if (*cp == ':')
1324 *cp++ = '\0';
1325 addr = in_aton(name);
1326 memmove(name, cp, strlen(cp) + 1);
1327 } else
1328 addr = NONE;
1329
1330 return addr;
1331}
1332
1333#define DEVICE_WAIT_MAX 12
1334
1335static int __init wait_for_devices(void)
1336{
1337 int i;
1338
1339 for (i = 0; i < DEVICE_WAIT_MAX; i++) {
1340 struct net_device *dev;
1341 int found = 0;
1342
1343 rtnl_lock();
1344 for_each_netdev(&init_net, dev) {
1345 if (ic_is_init_dev(dev)) {
1346 found = 1;
1347 break;
1348 }
1349 }
1350 rtnl_unlock();
1351 if (found)
1352 return 0;
1353 ssleep(1);
1354 }
1355 return -ENODEV;
1356}
1357
1358
1359
1360
1361
1362static int __init ip_auto_config(void)
1363{
1364 __be32 addr;
1365#ifdef IPCONFIG_DYNAMIC
1366 int retries = CONF_OPEN_RETRIES;
1367#endif
1368 int err;
1369 unsigned int i;
1370
1371#ifdef CONFIG_PROC_FS
1372 proc_create("pnp", 0444, init_net.proc_net, &pnp_seq_fops);
1373#endif
1374
1375 if (!ic_enable)
1376 return 0;
1377
1378 pr_debug("IP-Config: Entered.\n");
1379#ifdef IPCONFIG_DYNAMIC
1380 try_try_again:
1381#endif
1382
1383 err = wait_for_devices();
1384 if (err)
1385 return err;
1386
1387
1388 err = ic_open_devs();
1389 if (err)
1390 return err;
1391
1392
1393 msleep(CONF_POST_OPEN);
1394
1395
1396
1397
1398
1399
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
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426#ifdef CONFIG_ROOT_NFS
1427 if (ROOT_DEV == Root_NFS) {
1428 pr_err("IP-Config: Retrying forever (NFS root)...\n");
1429 goto try_try_again;
1430 }
1431#endif
1432
1433 if (--retries) {
1434 pr_err("IP-Config: Reopening network devices...\n");
1435 goto try_try_again;
1436 }
1437
1438
1439 pr_err("IP-Config: Auto-configuration of network failed\n");
1440 return -1;
1441 }
1442#else
1443 pr_err("IP-Config: Incomplete network configuration information\n");
1444 ic_close_devs();
1445 return -1;
1446#endif
1447 } else {
1448
1449 ic_dev = ic_first_dev;
1450 }
1451
1452 addr = root_nfs_parse_addr(root_server_path);
1453 if (root_server_addr == NONE)
1454 root_server_addr = addr;
1455
1456
1457
1458
1459 if (ic_defaults() < 0)
1460 return -1;
1461
1462
1463
1464
1465#ifdef IPCONFIG_DYNAMIC
1466 ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP);
1467#endif
1468
1469#ifndef IPCONFIG_SILENT
1470
1471
1472
1473 pr_info("IP-Config: Complete:\n");
1474
1475 pr_info(" device=%s, hwaddr=%*phC, ipaddr=%pI4, mask=%pI4, gw=%pI4\n",
1476 ic_dev->dev->name, ic_dev->dev->addr_len, ic_dev->dev->dev_addr,
1477 &ic_myaddr, &ic_netmask, &ic_gateway);
1478 pr_info(" host=%s, domain=%s, nis-domain=%s\n",
1479 utsname()->nodename, ic_domain, utsname()->domainname);
1480 pr_info(" bootserver=%pI4, rootserver=%pI4, rootpath=%s",
1481 &ic_servaddr, &root_server_addr, root_server_path);
1482 if (ic_dev_mtu)
1483 pr_cont(", mtu=%d", ic_dev_mtu);
1484 for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
1485 if (ic_nameservers[i] != NONE) {
1486 pr_cont(" nameserver%u=%pI4",
1487 i, &ic_nameservers[i]);
1488 break;
1489 }
1490 for (i++; i < CONF_NAMESERVERS_MAX; i++)
1491 if (ic_nameservers[i] != NONE)
1492 pr_cont(", nameserver%u=%pI4", i, &ic_nameservers[i]);
1493 pr_cont("\n");
1494#endif
1495
1496
1497
1498
1499
1500 if (ic_setup_if() < 0 || ic_setup_routes() < 0)
1501 err = -1;
1502 else
1503 err = 0;
1504
1505 ic_close_devs();
1506
1507 return err;
1508}
1509
1510late_initcall(ip_auto_config);
1511
1512
1513
1514
1515
1516
1517static int __init ic_proto_name(char *name)
1518{
1519 if (!strcmp(name, "on") || !strcmp(name, "any")) {
1520 return 1;
1521 }
1522 if (!strcmp(name, "off") || !strcmp(name, "none")) {
1523 return 0;
1524 }
1525#ifdef CONFIG_IP_PNP_DHCP
1526 else if (!strncmp(name, "dhcp", 4)) {
1527 char *client_id;
1528
1529 ic_proto_enabled &= ~IC_RARP;
1530 client_id = strstr(name, "dhcp,");
1531 if (client_id) {
1532 char *v;
1533
1534 client_id = client_id + 5;
1535 v = strchr(client_id, ',');
1536 if (!v)
1537 return 1;
1538 *v = 0;
1539 if (kstrtou8(client_id, 0, dhcp_client_identifier))
1540 pr_debug("DHCP: Invalid client identifier type\n");
1541 strncpy(dhcp_client_identifier + 1, v + 1, 251);
1542 *v = ',';
1543 }
1544 return 1;
1545 }
1546#endif
1547#ifdef CONFIG_IP_PNP_BOOTP
1548 else if (!strcmp(name, "bootp")) {
1549 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP);
1550 return 1;
1551 }
1552#endif
1553#ifdef CONFIG_IP_PNP_RARP
1554 else if (!strcmp(name, "rarp")) {
1555 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP);
1556 return 1;
1557 }
1558#endif
1559#ifdef IPCONFIG_DYNAMIC
1560 else if (!strcmp(name, "both")) {
1561 ic_proto_enabled &= ~IC_USE_DHCP;
1562 return 1;
1563 }
1564#endif
1565 return 0;
1566}
1567
1568static int __init ip_auto_config_setup(char *addrs)
1569{
1570 char *cp, *ip, *dp;
1571 int num = 0;
1572
1573 ic_set_manually = 1;
1574 ic_enable = 1;
1575
1576
1577
1578
1579
1580 if (ic_proto_name(addrs))
1581 return 1;
1582
1583
1584 if (*addrs == 0 ||
1585 strcmp(addrs, "off") == 0 ||
1586 strcmp(addrs, "none") == 0) {
1587 ic_enable = 0;
1588 return 1;
1589 }
1590
1591 ic_nameservers_predef();
1592
1593
1594 ip = addrs;
1595 while (ip && *ip) {
1596 if ((cp = strchr(ip, ':')))
1597 *cp++ = '\0';
1598 if (strlen(ip) > 0) {
1599 pr_debug("IP-Config: Parameter #%d: `%s'\n", num, ip);
1600 switch (num) {
1601 case 0:
1602 if ((ic_myaddr = in_aton(ip)) == ANY)
1603 ic_myaddr = NONE;
1604 break;
1605 case 1:
1606 if ((ic_servaddr = in_aton(ip)) == ANY)
1607 ic_servaddr = NONE;
1608 break;
1609 case 2:
1610 if ((ic_gateway = in_aton(ip)) == ANY)
1611 ic_gateway = NONE;
1612 break;
1613 case 3:
1614 if ((ic_netmask = in_aton(ip)) == ANY)
1615 ic_netmask = NONE;
1616 break;
1617 case 4:
1618 if ((dp = strchr(ip, '.'))) {
1619 *dp++ = '\0';
1620 strlcpy(utsname()->domainname, dp,
1621 sizeof(utsname()->domainname));
1622 }
1623 strlcpy(utsname()->nodename, ip,
1624 sizeof(utsname()->nodename));
1625 ic_host_name_set = 1;
1626 break;
1627 case 5:
1628 strlcpy(user_dev_name, ip, sizeof(user_dev_name));
1629 break;
1630 case 6:
1631 if (ic_proto_name(ip) == 0 &&
1632 ic_myaddr == NONE) {
1633 ic_enable = 0;
1634 }
1635 break;
1636 case 7:
1637 if (CONF_NAMESERVERS_MAX >= 1) {
1638 ic_nameservers[0] = in_aton(ip);
1639 if (ic_nameservers[0] == ANY)
1640 ic_nameservers[0] = NONE;
1641 }
1642 break;
1643 case 8:
1644 if (CONF_NAMESERVERS_MAX >= 2) {
1645 ic_nameservers[1] = in_aton(ip);
1646 if (ic_nameservers[1] == ANY)
1647 ic_nameservers[1] = NONE;
1648 }
1649 break;
1650 }
1651 }
1652 ip = cp;
1653 num++;
1654 }
1655
1656 return 1;
1657}
1658__setup("ip=", ip_auto_config_setup);
1659
1660static int __init nfsaddrs_config_setup(char *addrs)
1661{
1662 return ip_auto_config_setup(addrs);
1663}
1664__setup("nfsaddrs=", nfsaddrs_config_setup);
1665
1666static int __init vendor_class_identifier_setup(char *addrs)
1667{
1668 if (strlcpy(vendor_class_identifier, addrs,
1669 sizeof(vendor_class_identifier))
1670 >= sizeof(vendor_class_identifier))
1671 pr_warn("DHCP: vendorclass too long, truncated to \"%s\"\n",
1672 vendor_class_identifier);
1673 return 1;
1674}
1675__setup("dhcpclass=", vendor_class_identifier_setup);
1676