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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
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
91#define CONF_POST_OPEN 10
92#define CONF_CARRIER_TIMEOUT 120000
93
94
95#define CONF_OPEN_RETRIES 2
96#define CONF_SEND_RETRIES 6
97#define CONF_INTER_TIMEOUT (HZ/2)
98#define CONF_BASE_TIMEOUT (HZ*2)
99#define CONF_TIMEOUT_RANDOM (HZ)
100#define CONF_TIMEOUT_MULT *7/4
101#define CONF_TIMEOUT_MAX (HZ*30)
102#define CONF_NAMESERVERS_MAX 3
103
104
105#define NONE cpu_to_be32(INADDR_NONE)
106#define ANY cpu_to_be32(INADDR_ANY)
107
108
109
110
111
112
113
114
115
116int ic_set_manually __initdata = 0;
117
118static int ic_enable __initdata = 0;
119
120
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;
134
135__be32 ic_myaddr = NONE;
136static __be32 ic_netmask = NONE;
137__be32 ic_gateway = NONE;
138
139__be32 ic_addrservaddr = NONE;
140
141__be32 ic_servaddr = NONE;
142
143__be32 root_server_addr = NONE;
144u8 root_server_path[256] = { 0, };
145
146__be32 ic_dev_xid;
147
148
149static char vendor_class_identifier[253] __initdata;
150
151
152
153static int ic_proto_used;
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 = 0;
166
167
168static int ic_dev_mtu __initdata = 0;
169
170#ifdef IPCONFIG_DYNAMIC
171static DEFINE_SPINLOCK(ic_recv_lock);
172static volatile int ic_got_reply __initdata = 0;
173#endif
174#ifdef IPCONFIG_DHCP
175static int ic_dhcp_msgtype __initdata = 0;
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 = NULL;
192static struct net_device *ic_dev __initdata = NULL;
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;
210
211 last = &ic_first_dev;
212 rtnl_lock();
213
214
215 for_each_netdev(&init_net, dev) {
216 if (!(dev->flags & IFF_LOOPBACK))
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",
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 DBG(("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 while (jiffies - start < msecs_to_jiffies(CONF_CARRIER_TIMEOUT)) {
267 for_each_netdev(&init_net, dev)
268 if (ic_is_init_dev(dev) && netif_carrier_ok(dev))
269 goto have_carrier;
270
271 msleep(1);
272 }
273have_carrier:
274 rtnl_unlock();
275
276 *last = NULL;
277
278 if (!ic_first_dev) {
279 if (user_dev_name[0])
280 pr_err("IP-Config: Device `%s' not found\n",
281 user_dev_name);
282 else
283 pr_err("IP-Config: No network devices available\n");
284 return -ENODEV;
285 }
286 return 0;
287}
288
289static void __init ic_close_devs(void)
290{
291 struct ic_device *d, *next;
292 struct net_device *dev;
293
294 rtnl_lock();
295 next = ic_first_dev;
296 while ((d = next)) {
297 next = d->next;
298 dev = d->dev;
299 if (dev != ic_dev) {
300 DBG(("IP-Config: Downing %s\n", dev->name));
301 dev_change_flags(dev, d->flags);
302 }
303 kfree(d);
304 }
305 rtnl_unlock();
306}
307
308
309
310
311
312static inline void
313set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port)
314{
315 sin->sin_family = AF_INET;
316 sin->sin_addr.s_addr = addr;
317 sin->sin_port = port;
318}
319
320static int __init ic_devinet_ioctl(unsigned int cmd, struct ifreq *arg)
321{
322 int res;
323
324 mm_segment_t oldfs = get_fs();
325 set_fs(get_ds());
326 res = devinet_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
327 set_fs(oldfs);
328 return res;
329}
330
331static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg)
332{
333 int res;
334
335 mm_segment_t oldfs = get_fs();
336 set_fs(get_ds());
337 res = dev_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
338 set_fs(oldfs);
339 return res;
340}
341
342static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg)
343{
344 int res;
345
346 mm_segment_t oldfs = get_fs();
347 set_fs(get_ds());
348 res = ip_rt_ioctl(&init_net, cmd, (void __user *) arg);
349 set_fs(oldfs);
350 return res;
351}
352
353
354
355
356
357static int __init ic_setup_if(void)
358{
359 struct ifreq ir;
360 struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr;
361 int err;
362
363 memset(&ir, 0, sizeof(ir));
364 strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name);
365 set_sockaddr(sin, ic_myaddr, 0);
366 if ((err = ic_devinet_ioctl(SIOCSIFADDR, &ir)) < 0) {
367 pr_err("IP-Config: Unable to set interface address (%d)\n",
368 err);
369 return -1;
370 }
371 set_sockaddr(sin, ic_netmask, 0);
372 if ((err = ic_devinet_ioctl(SIOCSIFNETMASK, &ir)) < 0) {
373 pr_err("IP-Config: Unable to set interface netmask (%d)\n",
374 err);
375 return -1;
376 }
377 set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0);
378 if ((err = ic_devinet_ioctl(SIOCSIFBRDADDR, &ir)) < 0) {
379 pr_err("IP-Config: Unable to set interface broadcast address (%d)\n",
380 err);
381 return -1;
382 }
383
384
385
386
387 if (ic_dev_mtu != 0) {
388 strcpy(ir.ifr_name, ic_dev->name);
389 ir.ifr_mtu = ic_dev_mtu;
390 if ((err = ic_dev_ioctl(SIOCSIFMTU, &ir)) < 0)
391 pr_err("IP-Config: Unable to set interface mtu to %d (%d)\n",
392 ic_dev_mtu, err);
393 }
394 return 0;
395}
396
397static int __init ic_setup_routes(void)
398{
399
400
401 if (ic_gateway != NONE) {
402 struct rtentry rm;
403 int err;
404
405 memset(&rm, 0, sizeof(rm));
406 if ((ic_gateway ^ ic_myaddr) & ic_netmask) {
407 pr_err("IP-Config: Gateway not on directly connected network\n");
408 return -1;
409 }
410 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0);
411 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0);
412 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0);
413 rm.rt_flags = RTF_UP | RTF_GATEWAY;
414 if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) {
415 pr_err("IP-Config: Cannot add default route (%d)\n",
416 err);
417 return -1;
418 }
419 }
420
421 return 0;
422}
423
424
425
426
427
428static int __init ic_defaults(void)
429{
430
431
432
433
434
435 if (!ic_host_name_set)
436 sprintf(init_utsname()->nodename, "%pI4", &ic_myaddr);
437
438 if (root_server_addr == NONE)
439 root_server_addr = ic_servaddr;
440
441 if (ic_netmask == NONE) {
442 if (IN_CLASSA(ntohl(ic_myaddr)))
443 ic_netmask = htonl(IN_CLASSA_NET);
444 else if (IN_CLASSB(ntohl(ic_myaddr)))
445 ic_netmask = htonl(IN_CLASSB_NET);
446 else if (IN_CLASSC(ntohl(ic_myaddr)))
447 ic_netmask = htonl(IN_CLASSC_NET);
448 else {
449 pr_err("IP-Config: Unable to guess netmask for address %pI4\n",
450 &ic_myaddr);
451 return -1;
452 }
453 printk("IP-Config: Guessing netmask %pI4\n", &ic_netmask);
454 }
455
456 return 0;
457}
458
459
460
461
462
463#ifdef IPCONFIG_RARP
464
465static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
466
467static struct packet_type rarp_packet_type __initdata = {
468 .type = cpu_to_be16(ETH_P_RARP),
469 .func = ic_rarp_recv,
470};
471
472static inline void __init ic_rarp_init(void)
473{
474 dev_add_pack(&rarp_packet_type);
475}
476
477static inline void __init ic_rarp_cleanup(void)
478{
479 dev_remove_pack(&rarp_packet_type);
480}
481
482
483
484
485static int __init
486ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
487{
488 struct arphdr *rarp;
489 unsigned char *rarp_ptr;
490 __be32 sip, tip;
491 unsigned char *sha, *tha;
492 struct ic_device *d;
493
494 if (!net_eq(dev_net(dev), &init_net))
495 goto drop;
496
497 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
498 return NET_RX_DROP;
499
500 if (!pskb_may_pull(skb, sizeof(struct arphdr)))
501 goto drop;
502
503
504 rarp = (struct arphdr *)skb_transport_header(skb);
505
506
507
508
509 if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd))
510 goto drop;
511
512
513 if (rarp->ar_op != htons(ARPOP_RREPLY))
514 goto drop;
515
516
517 if (rarp->ar_pro != htons(ETH_P_IP))
518 goto drop;
519
520 if (!pskb_may_pull(skb, arp_hdr_len(dev)))
521 goto drop;
522
523
524 rarp = (struct arphdr *)skb_transport_header(skb);
525 rarp_ptr = (unsigned char *) (rarp + 1);
526
527
528 spin_lock(&ic_recv_lock);
529
530
531 if (ic_got_reply)
532 goto drop_unlock;
533
534
535 d = ic_first_dev;
536 while (d && d->dev != dev)
537 d = d->next;
538 if (!d)
539 goto drop_unlock;
540
541
542 sha = rarp_ptr;
543 rarp_ptr += dev->addr_len;
544 memcpy(&sip, rarp_ptr, 4);
545 rarp_ptr += 4;
546 tha = rarp_ptr;
547 rarp_ptr += dev->addr_len;
548 memcpy(&tip, rarp_ptr, 4);
549
550
551 if (memcmp(tha, dev->dev_addr, dev->addr_len))
552 goto drop_unlock;
553
554
555 if (ic_servaddr != NONE && ic_servaddr != sip)
556 goto drop_unlock;
557
558
559 ic_dev = dev;
560 if (ic_myaddr == NONE)
561 ic_myaddr = tip;
562 ic_servaddr = sip;
563 ic_addrservaddr = sip;
564 ic_got_reply = IC_RARP;
565
566drop_unlock:
567
568 spin_unlock(&ic_recv_lock);
569
570drop:
571
572 kfree_skb(skb);
573 return 0;
574}
575
576
577
578
579
580static void __init ic_rarp_send_if(struct ic_device *d)
581{
582 struct net_device *dev = d->dev;
583 arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL,
584 dev->dev_addr, dev->dev_addr);
585}
586#endif
587
588
589
590
591static inline void __init ic_nameservers_predef(void)
592{
593 int i;
594
595 for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
596 ic_nameservers[i] = NONE;
597}
598
599
600
601
602
603#ifdef IPCONFIG_BOOTP
604
605struct bootp_pkt {
606 struct iphdr iph;
607 struct udphdr udph;
608 u8 op;
609 u8 htype;
610 u8 hlen;
611 u8 hops;
612 __be32 xid;
613 __be16 secs;
614 __be16 flags;
615 __be32 client_ip;
616 __be32 your_ip;
617 __be32 server_ip;
618 __be32 relay_ip;
619 u8 hw_addr[16];
620 u8 serv_name[64];
621 u8 boot_file[128];
622 u8 exten[312];
623};
624
625
626#define BOOTP_REQUEST 1
627#define BOOTP_REPLY 2
628
629
630#define DHCPDISCOVER 1
631#define DHCPOFFER 2
632#define DHCPREQUEST 3
633#define DHCPDECLINE 4
634#define DHCPACK 5
635#define DHCPNAK 6
636#define DHCPRELEASE 7
637#define DHCPINFORM 8
638
639static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
640
641static struct packet_type bootp_packet_type __initdata = {
642 .type = cpu_to_be16(ETH_P_IP),
643 .func = ic_bootp_recv,
644};
645
646
647
648
649
650
651static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 };
652
653#ifdef IPCONFIG_DHCP
654
655static void __init
656ic_dhcp_init_options(u8 *options)
657{
658 u8 mt = ((ic_servaddr == NONE)
659 ? DHCPDISCOVER : DHCPREQUEST);
660 u8 *e = options;
661 int len;
662
663#ifdef IPCONFIG_DEBUG
664 printk("DHCP: Sending message type %d\n", mt);
665#endif
666
667 memcpy(e, ic_bootp_cookie, 4);
668 e += 4;
669
670 *e++ = 53;
671 *e++ = 1;
672 *e++ = mt;
673
674 if (mt == DHCPREQUEST) {
675 *e++ = 54;
676 *e++ = 4;
677 memcpy(e, &ic_servaddr, 4);
678 e += 4;
679
680 *e++ = 50;
681 *e++ = 4;
682 memcpy(e, &ic_myaddr, 4);
683 e += 4;
684 }
685
686
687 {
688 static const u8 ic_req_params[] = {
689 1,
690 3,
691 6,
692 12,
693 15,
694 17,
695 26,
696 40,
697 };
698
699 *e++ = 55;
700 *e++ = sizeof(ic_req_params);
701 memcpy(e, ic_req_params, sizeof(ic_req_params));
702 e += sizeof(ic_req_params);
703
704 if (ic_host_name_set) {
705 *e++ = 12;
706 len = strlen(utsname()->nodename);
707 *e++ = len;
708 memcpy(e, utsname()->nodename, len);
709 e += len;
710 }
711 if (*vendor_class_identifier) {
712 pr_info("DHCP: sending class identifier \"%s\"\n",
713 vendor_class_identifier);
714 *e++ = 60;
715 len = strlen(vendor_class_identifier);
716 *e++ = len;
717 memcpy(e, vendor_class_identifier, len);
718 e += len;
719 }
720 }
721
722 *e++ = 255;
723}
724
725#endif
726
727static void __init ic_bootp_init_ext(u8 *e)
728{
729 memcpy(e, ic_bootp_cookie, 4);
730 e += 4;
731 *e++ = 1;
732 *e++ = 4;
733 e += 4;
734 *e++ = 3;
735 *e++ = 4;
736 e += 4;
737 *e++ = 5;
738 *e++ = 8;
739 e += 8;
740 *e++ = 12;
741 *e++ = 32;
742 e += 32;
743 *e++ = 40;
744 *e++ = 32;
745 e += 32;
746 *e++ = 17;
747 *e++ = 40;
748 e += 40;
749
750 *e++ = 57;
751 *e++ = 2;
752 *e++ = 1;
753 *e++ = 150;
754
755 *e++ = 255;
756}
757
758
759
760
761
762static inline void __init ic_bootp_init(void)
763{
764 ic_nameservers_predef();
765
766 dev_add_pack(&bootp_packet_type);
767}
768
769
770
771
772
773static inline void __init ic_bootp_cleanup(void)
774{
775 dev_remove_pack(&bootp_packet_type);
776}
777
778
779
780
781
782static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff)
783{
784 struct net_device *dev = d->dev;
785 struct sk_buff *skb;
786 struct bootp_pkt *b;
787 struct iphdr *h;
788 int hlen = LL_RESERVED_SPACE(dev);
789 int tlen = dev->needed_tailroom;
790
791
792 skb = alloc_skb(sizeof(struct bootp_pkt) + hlen + tlen + 15,
793 GFP_KERNEL);
794 if (!skb)
795 return;
796 skb_reserve(skb, hlen);
797 b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt));
798 memset(b, 0, sizeof(struct bootp_pkt));
799
800
801 skb_reset_network_header(skb);
802 h = ip_hdr(skb);
803 h->version = 4;
804 h->ihl = 5;
805 h->tot_len = htons(sizeof(struct bootp_pkt));
806 h->frag_off = htons(IP_DF);
807 h->ttl = 64;
808 h->protocol = IPPROTO_UDP;
809 h->daddr = htonl(INADDR_BROADCAST);
810 h->check = ip_fast_csum((unsigned char *) h, h->ihl);
811
812
813 b->udph.source = htons(68);
814 b->udph.dest = htons(67);
815 b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr));
816
817
818
819 b->op = BOOTP_REQUEST;
820 if (dev->type < 256)
821 b->htype = dev->type;
822 else if (dev->type == ARPHRD_FDDI)
823 b->htype = ARPHRD_ETHER;
824 else {
825 printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name);
826 b->htype = dev->type;
827 }
828
829
830 b->hlen = dev->addr_len;
831 memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
832 b->secs = htons(jiffies_diff / HZ);
833 b->xid = d->xid;
834
835
836#ifdef IPCONFIG_DHCP
837 if (ic_proto_enabled & IC_USE_DHCP)
838 ic_dhcp_init_options(b->exten);
839 else
840#endif
841 ic_bootp_init_ext(b->exten);
842
843
844 skb->dev = dev;
845 skb->protocol = htons(ETH_P_IP);
846 if (dev_hard_header(skb, dev, ntohs(skb->protocol),
847 dev->broadcast, dev->dev_addr, skb->len) < 0) {
848 kfree_skb(skb);
849 printk("E");
850 return;
851 }
852
853 if (dev_queue_xmit(skb) < 0)
854 printk("E");
855}
856
857
858
859
860
861static int __init ic_bootp_string(char *dest, char *src, int len, int max)
862{
863 if (!len)
864 return 0;
865 if (len > max-1)
866 len = max-1;
867 memcpy(dest, src, len);
868 dest[len] = '\0';
869 return 1;
870}
871
872
873
874
875
876static void __init ic_do_bootp_ext(u8 *ext)
877{
878 u8 servers;
879 int i;
880 __be16 mtu;
881
882#ifdef IPCONFIG_DEBUG
883 u8 *c;
884
885 printk("DHCP/BOOTP: Got extension %d:",*ext);
886 for (c=ext+2; c<ext+2+ext[1]; c++)
887 printk(" %02x", *c);
888 printk("\n");
889#endif
890
891 switch (*ext++) {
892 case 1:
893 if (ic_netmask == NONE)
894 memcpy(&ic_netmask, ext+1, 4);
895 break;
896 case 3:
897 if (ic_gateway == NONE)
898 memcpy(&ic_gateway, ext+1, 4);
899 break;
900 case 6:
901 servers= *ext/4;
902 if (servers > CONF_NAMESERVERS_MAX)
903 servers = CONF_NAMESERVERS_MAX;
904 for (i = 0; i < servers; i++) {
905 if (ic_nameservers[i] == NONE)
906 memcpy(&ic_nameservers[i], ext+1+4*i, 4);
907 }
908 break;
909 case 12:
910 ic_bootp_string(utsname()->nodename, ext+1, *ext,
911 __NEW_UTS_LEN);
912 ic_host_name_set = 1;
913 break;
914 case 15:
915 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
916 break;
917 case 17:
918 if (!root_server_path[0])
919 ic_bootp_string(root_server_path, ext+1, *ext,
920 sizeof(root_server_path));
921 break;
922 case 26:
923 memcpy(&mtu, ext+1, sizeof(mtu));
924 ic_dev_mtu = ntohs(mtu);
925 break;
926 case 40:
927 ic_bootp_string(utsname()->domainname, ext+1, *ext,
928 __NEW_UTS_LEN);
929 break;
930 }
931}
932
933
934
935
936
937static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
938{
939 struct bootp_pkt *b;
940 struct iphdr *h;
941 struct ic_device *d;
942 int len, ext_len;
943
944 if (!net_eq(dev_net(dev), &init_net))
945 goto drop;
946
947
948 if (skb->pkt_type == PACKET_OTHERHOST)
949 goto drop;
950
951 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
952 return NET_RX_DROP;
953
954 if (!pskb_may_pull(skb,
955 sizeof(struct iphdr) +
956 sizeof(struct udphdr)))
957 goto drop;
958
959 b = (struct bootp_pkt *)skb_network_header(skb);
960 h = &b->iph;
961
962 if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP)
963 goto drop;
964
965
966 if (ip_is_fragment(h)) {
967 net_err_ratelimited("DHCP/BOOTP: Ignoring fragmented reply\n");
968 goto drop;
969 }
970
971 if (skb->len < ntohs(h->tot_len))
972 goto drop;
973
974 if (ip_fast_csum((char *) h, h->ihl))
975 goto drop;
976
977 if (b->udph.source != htons(67) || b->udph.dest != htons(68))
978 goto drop;
979
980 if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
981 goto drop;
982
983 len = ntohs(b->udph.len) - sizeof(struct udphdr);
984 ext_len = len - (sizeof(*b) -
985 sizeof(struct iphdr) -
986 sizeof(struct udphdr) -
987 sizeof(b->exten));
988 if (ext_len < 0)
989 goto drop;
990
991
992 if (!pskb_may_pull(skb, skb->len))
993 goto drop;
994
995 b = (struct bootp_pkt *)skb_network_header(skb);
996 h = &b->iph;
997
998
999 spin_lock(&ic_recv_lock);
1000
1001
1002 if (ic_got_reply)
1003 goto drop_unlock;
1004
1005
1006 d = ic_first_dev;
1007 while (d && d->dev != dev)
1008 d = d->next;
1009 if (!d)
1010 goto drop_unlock;
1011
1012
1013 if (b->op != BOOTP_REPLY ||
1014 b->xid != d->xid) {
1015 net_err_ratelimited("DHCP/BOOTP: Reply not for us, op[%x] xid[%x]\n",
1016 b->op, b->xid);
1017 goto drop_unlock;
1018 }
1019
1020
1021 if (b->xid != ic_dev_xid) {
1022 net_err_ratelimited("DHCP/BOOTP: Ignoring delayed packet\n");
1023 goto drop_unlock;
1024 }
1025
1026
1027 if (ext_len >= 4 &&
1028 !memcmp(b->exten, ic_bootp_cookie, 4)) {
1029 u8 *end = (u8 *) b + ntohs(b->iph.tot_len);
1030 u8 *ext;
1031
1032#ifdef IPCONFIG_DHCP
1033 if (ic_proto_enabled & IC_USE_DHCP) {
1034 __be32 server_id = NONE;
1035 int mt = 0;
1036
1037 ext = &b->exten[4];
1038 while (ext < end && *ext != 0xff) {
1039 u8 *opt = ext++;
1040 if (*opt == 0)
1041 continue;
1042 ext += *ext + 1;
1043 if (ext >= end)
1044 break;
1045 switch (*opt) {
1046 case 53:
1047 if (opt[1])
1048 mt = opt[2];
1049 break;
1050 case 54:
1051 if (opt[1] >= 4)
1052 memcpy(&server_id, opt + 2, 4);
1053 break;
1054 }
1055 }
1056
1057#ifdef IPCONFIG_DEBUG
1058 printk("DHCP: Got message type %d\n", mt);
1059#endif
1060
1061 switch (mt) {
1062 case DHCPOFFER:
1063
1064
1065
1066 if (ic_myaddr != NONE)
1067 goto drop_unlock;
1068
1069
1070 ic_myaddr = b->your_ip;
1071 ic_servaddr = server_id;
1072#ifdef IPCONFIG_DEBUG
1073 printk("DHCP: Offered address %pI4 by server %pI4\n",
1074 &ic_myaddr, &b->iph.saddr);
1075#endif
1076
1077
1078
1079
1080 if ((server_id != NONE) &&
1081 (b->server_ip != server_id))
1082 b->server_ip = ic_servaddr;
1083 break;
1084
1085 case DHCPACK:
1086 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0)
1087 goto drop_unlock;
1088
1089
1090 break;
1091
1092 default:
1093
1094 ic_myaddr = NONE;
1095 ic_servaddr = NONE;
1096 goto drop_unlock;
1097 }
1098
1099 ic_dhcp_msgtype = mt;
1100
1101 }
1102#endif
1103
1104 ext = &b->exten[4];
1105 while (ext < end && *ext != 0xff) {
1106 u8 *opt = ext++;
1107 if (*opt == 0)
1108 continue;
1109 ext += *ext + 1;
1110 if (ext < end)
1111 ic_do_bootp_ext(opt);
1112 }
1113 }
1114
1115
1116 ic_dev = dev;
1117 ic_myaddr = b->your_ip;
1118 ic_servaddr = b->server_ip;
1119 ic_addrservaddr = b->iph.saddr;
1120 if (ic_gateway == NONE && b->relay_ip)
1121 ic_gateway = b->relay_ip;
1122 if (ic_nameservers[0] == NONE)
1123 ic_nameservers[0] = ic_servaddr;
1124 ic_got_reply = IC_BOOTP;
1125
1126drop_unlock:
1127
1128 spin_unlock(&ic_recv_lock);
1129
1130drop:
1131
1132 kfree_skb(skb);
1133
1134 return 0;
1135}
1136
1137
1138#endif
1139
1140
1141
1142
1143
1144
1145#ifdef IPCONFIG_DYNAMIC
1146
1147static int __init ic_dynamic(void)
1148{
1149 int retries;
1150 struct ic_device *d;
1151 unsigned long start_jiffies, timeout, jiff;
1152 int do_bootp = ic_proto_have_if & IC_BOOTP;
1153 int do_rarp = ic_proto_have_if & IC_RARP;
1154
1155
1156
1157
1158
1159
1160 if (!ic_proto_enabled) {
1161 pr_err("IP-Config: Incomplete network configuration information\n");
1162 return -1;
1163 }
1164
1165#ifdef IPCONFIG_BOOTP
1166 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
1167 pr_err("DHCP/BOOTP: No suitable device found\n");
1168#endif
1169#ifdef IPCONFIG_RARP
1170 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)
1171 pr_err("RARP: No suitable device found\n");
1172#endif
1173
1174 if (!ic_proto_have_if)
1175
1176 return -1;
1177
1178
1179
1180
1181#ifdef IPCONFIG_BOOTP
1182 if (do_bootp)
1183 ic_bootp_init();
1184#endif
1185#ifdef IPCONFIG_RARP
1186 if (do_rarp)
1187 ic_rarp_init();
1188#endif
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198 pr_notice("Sending %s%s%s requests .",
1199 do_bootp
1200 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "",
1201 (do_bootp && do_rarp) ? " and " : "",
1202 do_rarp ? "RARP" : "");
1203
1204 start_jiffies = jiffies;
1205 d = ic_first_dev;
1206 retries = CONF_SEND_RETRIES;
1207 get_random_bytes(&timeout, sizeof(timeout));
1208 timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned int) CONF_TIMEOUT_RANDOM);
1209 for (;;) {
1210
1211 ic_dev_xid = d->xid;
1212
1213#ifdef IPCONFIG_BOOTP
1214 if (do_bootp && (d->able & IC_BOOTP))
1215 ic_bootp_send_if(d, jiffies - start_jiffies);
1216#endif
1217#ifdef IPCONFIG_RARP
1218 if (do_rarp && (d->able & IC_RARP))
1219 ic_rarp_send_if(d);
1220#endif
1221
1222 jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout);
1223 while (time_before(jiffies, jiff) && !ic_got_reply)
1224 schedule_timeout_uninterruptible(1);
1225#ifdef IPCONFIG_DHCP
1226
1227 if ((ic_got_reply & IC_BOOTP) &&
1228 (ic_proto_enabled & IC_USE_DHCP) &&
1229 ic_dhcp_msgtype != DHCPACK) {
1230 ic_got_reply = 0;
1231 pr_cont(",");
1232 continue;
1233 }
1234#endif
1235
1236 if (ic_got_reply) {
1237 pr_cont(" OK\n");
1238 break;
1239 }
1240
1241 if ((d = d->next))
1242 continue;
1243
1244 if (! --retries) {
1245 pr_cont(" timed out!\n");
1246 break;
1247 }
1248
1249 d = ic_first_dev;
1250
1251 timeout = timeout CONF_TIMEOUT_MULT;
1252 if (timeout > CONF_TIMEOUT_MAX)
1253 timeout = CONF_TIMEOUT_MAX;
1254
1255 pr_cont(".");
1256 }
1257
1258#ifdef IPCONFIG_BOOTP
1259 if (do_bootp)
1260 ic_bootp_cleanup();
1261#endif
1262#ifdef IPCONFIG_RARP
1263 if (do_rarp)
1264 ic_rarp_cleanup();
1265#endif
1266
1267 if (!ic_got_reply) {
1268 ic_myaddr = NONE;
1269 return -1;
1270 }
1271
1272 printk("IP-Config: Got %s answer from %pI4, ",
1273 ((ic_got_reply & IC_RARP) ? "RARP"
1274 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),
1275 &ic_addrservaddr);
1276 pr_cont("my address is %pI4\n", &ic_myaddr);
1277
1278 return 0;
1279}
1280
1281#endif
1282
1283#ifdef CONFIG_PROC_FS
1284
1285static int pnp_seq_show(struct seq_file *seq, void *v)
1286{
1287 int i;
1288
1289 if (ic_proto_used & IC_PROTO)
1290 seq_printf(seq, "#PROTO: %s\n",
1291 (ic_proto_used & IC_RARP) ? "RARP"
1292 : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP");
1293 else
1294 seq_puts(seq, "#MANUAL\n");
1295
1296 if (ic_domain[0])
1297 seq_printf(seq,
1298 "domain %s\n", ic_domain);
1299 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {
1300 if (ic_nameservers[i] != NONE)
1301 seq_printf(seq, "nameserver %pI4\n",
1302 &ic_nameservers[i]);
1303 }
1304 if (ic_servaddr != NONE)
1305 seq_printf(seq, "bootserver %pI4\n",
1306 &ic_servaddr);
1307 return 0;
1308}
1309
1310static int pnp_seq_open(struct inode *indoe, struct file *file)
1311{
1312 return single_open(file, pnp_seq_show, NULL);
1313}
1314
1315static const struct file_operations pnp_seq_fops = {
1316 .owner = THIS_MODULE,
1317 .open = pnp_seq_open,
1318 .read = seq_read,
1319 .llseek = seq_lseek,
1320 .release = single_release,
1321};
1322#endif
1323
1324
1325
1326
1327
1328
1329__be32 __init root_nfs_parse_addr(char *name)
1330{
1331 __be32 addr;
1332 int octets = 0;
1333 char *cp, *cq;
1334
1335 cp = cq = name;
1336 while (octets < 4) {
1337 while (*cp >= '0' && *cp <= '9')
1338 cp++;
1339 if (cp == cq || cp - cq > 3)
1340 break;
1341 if (*cp == '.' || octets == 3)
1342 octets++;
1343 if (octets < 4)
1344 cp++;
1345 cq = cp;
1346 }
1347 if (octets == 4 && (*cp == ':' || *cp == '\0')) {
1348 if (*cp == ':')
1349 *cp++ = '\0';
1350 addr = in_aton(name);
1351 memmove(name, cp, strlen(cp) + 1);
1352 } else
1353 addr = NONE;
1354
1355 return addr;
1356}
1357
1358#define DEVICE_WAIT_MAX 12
1359
1360static int __init wait_for_devices(void)
1361{
1362 int i;
1363
1364 for (i = 0; i < DEVICE_WAIT_MAX; i++) {
1365 struct net_device *dev;
1366 int found = 0;
1367
1368 rtnl_lock();
1369 for_each_netdev(&init_net, dev) {
1370 if (ic_is_init_dev(dev)) {
1371 found = 1;
1372 break;
1373 }
1374 }
1375 rtnl_unlock();
1376 if (found)
1377 return 0;
1378 ssleep(1);
1379 }
1380 return -ENODEV;
1381}
1382
1383
1384
1385
1386
1387static int __init ip_auto_config(void)
1388{
1389 __be32 addr;
1390#ifdef IPCONFIG_DYNAMIC
1391 int retries = CONF_OPEN_RETRIES;
1392#endif
1393 int err;
1394 unsigned int i;
1395
1396#ifdef CONFIG_PROC_FS
1397 proc_net_fops_create(&init_net, "pnp", S_IRUGO, &pnp_seq_fops);
1398#endif
1399
1400 if (!ic_enable)
1401 return 0;
1402
1403 DBG(("IP-Config: Entered.\n"));
1404#ifdef IPCONFIG_DYNAMIC
1405 try_try_again:
1406#endif
1407
1408 err = wait_for_devices();
1409 if (err)
1410 return err;
1411
1412
1413 err = ic_open_devs();
1414 if (err)
1415 return err;
1416
1417
1418 msleep(CONF_POST_OPEN);
1419
1420
1421
1422
1423
1424
1425
1426 if (ic_myaddr == NONE ||
1427#ifdef CONFIG_ROOT_NFS
1428 (root_server_addr == NONE &&
1429 ic_servaddr == NONE &&
1430 ROOT_DEV == Root_NFS) ||
1431#endif
1432 ic_first_dev->next) {
1433#ifdef IPCONFIG_DYNAMIC
1434 if (ic_dynamic() < 0) {
1435 ic_close_devs();
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451#ifdef CONFIG_ROOT_NFS
1452 if (ROOT_DEV == Root_NFS) {
1453 pr_err("IP-Config: Retrying forever (NFS root)...\n");
1454 goto try_try_again;
1455 }
1456#endif
1457
1458 if (--retries) {
1459 pr_err("IP-Config: Reopening network devices...\n");
1460 goto try_try_again;
1461 }
1462
1463
1464 pr_err("IP-Config: Auto-configuration of network failed\n");
1465 return -1;
1466 }
1467#else
1468 pr_err("IP-Config: Incomplete network configuration information\n");
1469 ic_close_devs();
1470 return -1;
1471#endif
1472 } else {
1473
1474 ic_dev = ic_first_dev->dev;
1475 }
1476
1477 addr = root_nfs_parse_addr(root_server_path);
1478 if (root_server_addr == NONE)
1479 root_server_addr = addr;
1480
1481
1482
1483
1484 if (ic_defaults() < 0)
1485 return -1;
1486
1487
1488
1489
1490
1491 ic_close_devs();
1492 if (ic_setup_if() < 0 || ic_setup_routes() < 0)
1493 return -1;
1494
1495
1496
1497
1498#ifdef IPCONFIG_DYNAMIC
1499 ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP);
1500#endif
1501
1502#ifndef IPCONFIG_SILENT
1503
1504
1505
1506 pr_info("IP-Config: Complete:\n");
1507
1508 pr_info(" device=%s, hwaddr=%*phC, ipaddr=%pI4, mask=%pI4, gw=%pI4\n",
1509 ic_dev->name, ic_dev->addr_len, ic_dev->dev_addr,
1510 &ic_myaddr, &ic_netmask, &ic_gateway);
1511 pr_info(" host=%s, domain=%s, nis-domain=%s\n",
1512 utsname()->nodename, ic_domain, utsname()->domainname);
1513 pr_info(" bootserver=%pI4, rootserver=%pI4, rootpath=%s",
1514 &ic_servaddr, &root_server_addr, root_server_path);
1515 if (ic_dev_mtu)
1516 pr_cont(", mtu=%d", ic_dev_mtu);
1517 for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
1518 if (ic_nameservers[i] != NONE) {
1519 pr_info(" nameserver%u=%pI4",
1520 i, &ic_nameservers[i]);
1521 break;
1522 }
1523 for (i++; i < CONF_NAMESERVERS_MAX; i++)
1524 if (ic_nameservers[i] != NONE)
1525 pr_cont(", nameserver%u=%pI4\n", i, &ic_nameservers[i]);
1526#endif
1527
1528 return 0;
1529}
1530
1531late_initcall(ip_auto_config);
1532
1533
1534
1535
1536
1537
1538static int __init ic_proto_name(char *name)
1539{
1540 if (!strcmp(name, "on") || !strcmp(name, "any")) {
1541 return 1;
1542 }
1543 if (!strcmp(name, "off") || !strcmp(name, "none")) {
1544 return 0;
1545 }
1546#ifdef CONFIG_IP_PNP_DHCP
1547 else if (!strcmp(name, "dhcp")) {
1548 ic_proto_enabled &= ~IC_RARP;
1549 return 1;
1550 }
1551#endif
1552#ifdef CONFIG_IP_PNP_BOOTP
1553 else if (!strcmp(name, "bootp")) {
1554 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP);
1555 return 1;
1556 }
1557#endif
1558#ifdef CONFIG_IP_PNP_RARP
1559 else if (!strcmp(name, "rarp")) {
1560 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP);
1561 return 1;
1562 }
1563#endif
1564#ifdef IPCONFIG_DYNAMIC
1565 else if (!strcmp(name, "both")) {
1566 ic_proto_enabled &= ~IC_USE_DHCP;
1567 return 1;
1568 }
1569#endif
1570 return 0;
1571}
1572
1573static int __init ip_auto_config_setup(char *addrs)
1574{
1575 char *cp, *ip, *dp;
1576 int num = 0;
1577
1578 ic_set_manually = 1;
1579 ic_enable = 1;
1580
1581
1582
1583
1584
1585 if (ic_proto_name(addrs))
1586 return 1;
1587
1588
1589 if (*addrs == 0 ||
1590 strcmp(addrs, "off") == 0 ||
1591 strcmp(addrs, "none") == 0) {
1592 ic_enable = 0;
1593 return 1;
1594 }
1595
1596 ic_nameservers_predef();
1597
1598
1599 ip = addrs;
1600 while (ip && *ip) {
1601 if ((cp = strchr(ip, ':')))
1602 *cp++ = '\0';
1603 if (strlen(ip) > 0) {
1604 DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip));
1605 switch (num) {
1606 case 0:
1607 if ((ic_myaddr = in_aton(ip)) == ANY)
1608 ic_myaddr = NONE;
1609 break;
1610 case 1:
1611 if ((ic_servaddr = in_aton(ip)) == ANY)
1612 ic_servaddr = NONE;
1613 break;
1614 case 2:
1615 if ((ic_gateway = in_aton(ip)) == ANY)
1616 ic_gateway = NONE;
1617 break;
1618 case 3:
1619 if ((ic_netmask = in_aton(ip)) == ANY)
1620 ic_netmask = NONE;
1621 break;
1622 case 4:
1623 if ((dp = strchr(ip, '.'))) {
1624 *dp++ = '\0';
1625 strlcpy(utsname()->domainname, dp,
1626 sizeof(utsname()->domainname));
1627 }
1628 strlcpy(utsname()->nodename, ip,
1629 sizeof(utsname()->nodename));
1630 ic_host_name_set = 1;
1631 break;
1632 case 5:
1633 strlcpy(user_dev_name, ip, sizeof(user_dev_name));
1634 break;
1635 case 6:
1636 if (ic_proto_name(ip) == 0 &&
1637 ic_myaddr == NONE) {
1638 ic_enable = 0;
1639 }
1640 break;
1641 case 7:
1642 if (CONF_NAMESERVERS_MAX >= 1) {
1643 ic_nameservers[0] = in_aton(ip);
1644 if (ic_nameservers[0] == ANY)
1645 ic_nameservers[0] = NONE;
1646 }
1647 break;
1648 case 8:
1649 if (CONF_NAMESERVERS_MAX >= 2) {
1650 ic_nameservers[1] = in_aton(ip);
1651 if (ic_nameservers[1] == ANY)
1652 ic_nameservers[1] = NONE;
1653 }
1654 break;
1655 }
1656 }
1657 ip = cp;
1658 num++;
1659 }
1660
1661 return 1;
1662}
1663__setup("ip=", ip_auto_config_setup);
1664
1665static int __init nfsaddrs_config_setup(char *addrs)
1666{
1667 return ip_auto_config_setup(addrs);
1668}
1669__setup("nfsaddrs=", nfsaddrs_config_setup);
1670
1671static int __init vendor_class_identifier_setup(char *addrs)
1672{
1673 if (strlcpy(vendor_class_identifier, addrs,
1674 sizeof(vendor_class_identifier))
1675 >= sizeof(vendor_class_identifier))
1676 pr_warn("DHCP: vendorclass too long, truncated to \"%s\"",
1677 vendor_class_identifier);
1678 return 1;
1679}
1680__setup("dhcpclass=", vendor_class_identifier_setup);
1681