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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
147static char vendor_class_identifier[253] __initdata;
148
149
150
151static int ic_proto_used;
152static __be32 ic_nameservers[CONF_NAMESERVERS_MAX];
153static u8 ic_domain[64];
154
155
156
157
158
159
160static char user_dev_name[IFNAMSIZ] __initdata = { 0, };
161
162
163static int ic_proto_have_if __initdata = 0;
164
165
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;
171#endif
172#ifdef IPCONFIG_DHCP
173static int ic_dhcp_msgtype __initdata = 0;
174#endif
175
176
177
178
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;
190static struct net_device *ic_dev __initdata = NULL;
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, next_msg;
208
209 last = &ic_first_dev;
210 rtnl_lock();
211
212
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
259 if (!ic_first_dev)
260 goto have_carrier;
261
262
263 start = jiffies;
264 next_msg = start + msecs_to_jiffies(CONF_CARRIER_TIMEOUT/12);
265 while (jiffies - start < 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) {
309 DBG(("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
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
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
393
394
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
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
435
436
437static int __init ic_defaults(void)
438{
439
440
441
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 printk("IP-Config: Guessing netmask %pI4\n", &ic_netmask);
463 }
464
465 return 0;
466}
467
468
469
470
471
472#ifdef IPCONFIG_RARP
473
474static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
475
476static struct packet_type rarp_packet_type __initdata = {
477 .type = cpu_to_be16(ETH_P_RARP),
478 .func = ic_rarp_recv,
479};
480
481static inline void __init ic_rarp_init(void)
482{
483 dev_add_pack(&rarp_packet_type);
484}
485
486static inline void __init ic_rarp_cleanup(void)
487{
488 dev_remove_pack(&rarp_packet_type);
489}
490
491
492
493
494static int __init
495ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
496{
497 struct arphdr *rarp;
498 unsigned char *rarp_ptr;
499 __be32 sip, tip;
500 unsigned char *sha, *tha;
501 struct ic_device *d;
502
503 if (!net_eq(dev_net(dev), &init_net))
504 goto drop;
505
506 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
507 return NET_RX_DROP;
508
509 if (!pskb_may_pull(skb, sizeof(struct arphdr)))
510 goto drop;
511
512
513 rarp = (struct arphdr *)skb_transport_header(skb);
514
515
516
517
518 if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd))
519 goto drop;
520
521
522 if (rarp->ar_op != htons(ARPOP_RREPLY))
523 goto drop;
524
525
526 if (rarp->ar_pro != htons(ETH_P_IP))
527 goto drop;
528
529 if (!pskb_may_pull(skb, arp_hdr_len(dev)))
530 goto drop;
531
532
533 rarp = (struct arphdr *)skb_transport_header(skb);
534 rarp_ptr = (unsigned char *) (rarp + 1);
535
536
537 spin_lock(&ic_recv_lock);
538
539
540 if (ic_got_reply)
541 goto drop_unlock;
542
543
544 d = ic_first_dev;
545 while (d && d->dev != dev)
546 d = d->next;
547 if (!d)
548 goto drop_unlock;
549
550
551 sha = rarp_ptr;
552 rarp_ptr += dev->addr_len;
553 memcpy(&sip, rarp_ptr, 4);
554 rarp_ptr += 4;
555 tha = rarp_ptr;
556 rarp_ptr += dev->addr_len;
557 memcpy(&tip, rarp_ptr, 4);
558
559
560 if (memcmp(tha, dev->dev_addr, dev->addr_len))
561 goto drop_unlock;
562
563
564 if (ic_servaddr != NONE && ic_servaddr != sip)
565 goto drop_unlock;
566
567
568 ic_dev = dev;
569 if (ic_myaddr == NONE)
570 ic_myaddr = tip;
571 ic_servaddr = sip;
572 ic_addrservaddr = sip;
573 ic_got_reply = IC_RARP;
574
575drop_unlock:
576
577 spin_unlock(&ic_recv_lock);
578
579drop:
580
581 kfree_skb(skb);
582 return 0;
583}
584
585
586
587
588
589static void __init ic_rarp_send_if(struct ic_device *d)
590{
591 struct net_device *dev = d->dev;
592 arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL,
593 dev->dev_addr, dev->dev_addr);
594}
595#endif
596
597
598
599
600static inline void __init ic_nameservers_predef(void)
601{
602 int i;
603
604 for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
605 ic_nameservers[i] = NONE;
606}
607
608
609
610
611
612#ifdef IPCONFIG_BOOTP
613
614struct bootp_pkt {
615 struct iphdr iph;
616 struct udphdr udph;
617 u8 op;
618 u8 htype;
619 u8 hlen;
620 u8 hops;
621 __be32 xid;
622 __be16 secs;
623 __be16 flags;
624 __be32 client_ip;
625 __be32 your_ip;
626 __be32 server_ip;
627 __be32 relay_ip;
628 u8 hw_addr[16];
629 u8 serv_name[64];
630 u8 boot_file[128];
631 u8 exten[312];
632};
633
634
635#define BOOTP_REQUEST 1
636#define BOOTP_REPLY 2
637
638
639#define DHCPDISCOVER 1
640#define DHCPOFFER 2
641#define DHCPREQUEST 3
642#define DHCPDECLINE 4
643#define DHCPACK 5
644#define DHCPNAK 6
645#define DHCPRELEASE 7
646#define DHCPINFORM 8
647
648static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
649
650static struct packet_type bootp_packet_type __initdata = {
651 .type = cpu_to_be16(ETH_P_IP),
652 .func = ic_bootp_recv,
653};
654
655static __be32 ic_dev_xid;
656
657
658
659
660
661static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 };
662
663#ifdef IPCONFIG_DHCP
664
665static void __init
666ic_dhcp_init_options(u8 *options)
667{
668 u8 mt = ((ic_servaddr == NONE)
669 ? DHCPDISCOVER : DHCPREQUEST);
670 u8 *e = options;
671 int len;
672
673#ifdef IPCONFIG_DEBUG
674 printk("DHCP: Sending message type %d\n", mt);
675#endif
676
677 memcpy(e, ic_bootp_cookie, 4);
678 e += 4;
679
680 *e++ = 53;
681 *e++ = 1;
682 *e++ = mt;
683
684 if (mt == DHCPREQUEST) {
685 *e++ = 54;
686 *e++ = 4;
687 memcpy(e, &ic_servaddr, 4);
688 e += 4;
689
690 *e++ = 50;
691 *e++ = 4;
692 memcpy(e, &ic_myaddr, 4);
693 e += 4;
694 }
695
696
697 {
698 static const u8 ic_req_params[] = {
699 1,
700 3,
701 6,
702 12,
703 15,
704 17,
705 26,
706 40,
707 };
708
709 *e++ = 55;
710 *e++ = sizeof(ic_req_params);
711 memcpy(e, ic_req_params, sizeof(ic_req_params));
712 e += sizeof(ic_req_params);
713
714 if (ic_host_name_set) {
715 *e++ = 12;
716 len = strlen(utsname()->nodename);
717 *e++ = len;
718 memcpy(e, utsname()->nodename, len);
719 e += len;
720 }
721 if (*vendor_class_identifier) {
722 pr_info("DHCP: sending class identifier \"%s\"\n",
723 vendor_class_identifier);
724 *e++ = 60;
725 len = strlen(vendor_class_identifier);
726 *e++ = len;
727 memcpy(e, vendor_class_identifier, len);
728 e += len;
729 }
730 }
731
732 *e++ = 255;
733}
734
735#endif
736
737static void __init ic_bootp_init_ext(u8 *e)
738{
739 memcpy(e, ic_bootp_cookie, 4);
740 e += 4;
741 *e++ = 1;
742 *e++ = 4;
743 e += 4;
744 *e++ = 3;
745 *e++ = 4;
746 e += 4;
747 *e++ = 5;
748 *e++ = 8;
749 e += 8;
750 *e++ = 12;
751 *e++ = 32;
752 e += 32;
753 *e++ = 40;
754 *e++ = 32;
755 e += 32;
756 *e++ = 17;
757 *e++ = 40;
758 e += 40;
759
760 *e++ = 57;
761 *e++ = 2;
762 *e++ = 1;
763 *e++ = 150;
764
765 *e++ = 255;
766}
767
768
769
770
771
772static inline void __init ic_bootp_init(void)
773{
774 ic_nameservers_predef();
775
776 dev_add_pack(&bootp_packet_type);
777}
778
779
780
781
782
783static inline void __init ic_bootp_cleanup(void)
784{
785 dev_remove_pack(&bootp_packet_type);
786}
787
788
789
790
791
792static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff)
793{
794 struct net_device *dev = d->dev;
795 struct sk_buff *skb;
796 struct bootp_pkt *b;
797 struct iphdr *h;
798 int hlen = LL_RESERVED_SPACE(dev);
799 int tlen = dev->needed_tailroom;
800
801
802 skb = alloc_skb(sizeof(struct bootp_pkt) + hlen + tlen + 15,
803 GFP_KERNEL);
804 if (!skb)
805 return;
806 skb_reserve(skb, hlen);
807 b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt));
808 memset(b, 0, sizeof(struct bootp_pkt));
809
810
811 skb_reset_network_header(skb);
812 h = ip_hdr(skb);
813 h->version = 4;
814 h->ihl = 5;
815 h->tot_len = htons(sizeof(struct bootp_pkt));
816 h->frag_off = htons(IP_DF);
817 h->ttl = 64;
818 h->protocol = IPPROTO_UDP;
819 h->daddr = htonl(INADDR_BROADCAST);
820 h->check = ip_fast_csum((unsigned char *) h, h->ihl);
821
822
823 b->udph.source = htons(68);
824 b->udph.dest = htons(67);
825 b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr));
826
827
828
829 b->op = BOOTP_REQUEST;
830 if (dev->type < 256)
831 b->htype = dev->type;
832 else if (dev->type == ARPHRD_FDDI)
833 b->htype = ARPHRD_ETHER;
834 else {
835 printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name);
836 b->htype = dev->type;
837 }
838
839
840 b->hlen = dev->addr_len;
841 memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
842 b->secs = htons(jiffies_diff / HZ);
843 b->xid = d->xid;
844
845
846#ifdef IPCONFIG_DHCP
847 if (ic_proto_enabled & IC_USE_DHCP)
848 ic_dhcp_init_options(b->exten);
849 else
850#endif
851 ic_bootp_init_ext(b->exten);
852
853
854 skb->dev = dev;
855 skb->protocol = htons(ETH_P_IP);
856 if (dev_hard_header(skb, dev, ntohs(skb->protocol),
857 dev->broadcast, dev->dev_addr, skb->len) < 0) {
858 kfree_skb(skb);
859 printk("E");
860 return;
861 }
862
863 if (dev_queue_xmit(skb) < 0)
864 printk("E");
865}
866
867
868
869
870
871static int __init ic_bootp_string(char *dest, char *src, int len, int max)
872{
873 if (!len)
874 return 0;
875 if (len > max-1)
876 len = max-1;
877 memcpy(dest, src, len);
878 dest[len] = '\0';
879 return 1;
880}
881
882
883
884
885
886static void __init ic_do_bootp_ext(u8 *ext)
887{
888 u8 servers;
889 int i;
890 __be16 mtu;
891
892#ifdef IPCONFIG_DEBUG
893 u8 *c;
894
895 printk("DHCP/BOOTP: Got extension %d:",*ext);
896 for (c=ext+2; c<ext+2+ext[1]; c++)
897 printk(" %02x", *c);
898 printk("\n");
899#endif
900
901 switch (*ext++) {
902 case 1:
903 if (ic_netmask == NONE)
904 memcpy(&ic_netmask, ext+1, 4);
905 break;
906 case 3:
907 if (ic_gateway == NONE)
908 memcpy(&ic_gateway, ext+1, 4);
909 break;
910 case 6:
911 servers= *ext/4;
912 if (servers > CONF_NAMESERVERS_MAX)
913 servers = CONF_NAMESERVERS_MAX;
914 for (i = 0; i < servers; i++) {
915 if (ic_nameservers[i] == NONE)
916 memcpy(&ic_nameservers[i], ext+1+4*i, 4);
917 }
918 break;
919 case 12:
920 ic_bootp_string(utsname()->nodename, ext+1, *ext,
921 __NEW_UTS_LEN);
922 ic_host_name_set = 1;
923 break;
924 case 15:
925 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
926 break;
927 case 17:
928 if (!root_server_path[0])
929 ic_bootp_string(root_server_path, ext+1, *ext,
930 sizeof(root_server_path));
931 break;
932 case 26:
933 memcpy(&mtu, ext+1, sizeof(mtu));
934 ic_dev_mtu = ntohs(mtu);
935 break;
936 case 40:
937 ic_bootp_string(utsname()->domainname, ext+1, *ext,
938 __NEW_UTS_LEN);
939 break;
940 }
941}
942
943
944
945
946
947static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
948{
949 struct bootp_pkt *b;
950 struct iphdr *h;
951 struct ic_device *d;
952 int len, ext_len;
953
954 if (!net_eq(dev_net(dev), &init_net))
955 goto drop;
956
957
958 if (skb->pkt_type == PACKET_OTHERHOST)
959 goto drop;
960
961 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
962 return NET_RX_DROP;
963
964 if (!pskb_may_pull(skb,
965 sizeof(struct iphdr) +
966 sizeof(struct udphdr)))
967 goto drop;
968
969 b = (struct bootp_pkt *)skb_network_header(skb);
970 h = &b->iph;
971
972 if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP)
973 goto drop;
974
975
976 if (ip_is_fragment(h)) {
977 net_err_ratelimited("DHCP/BOOTP: Ignoring fragmented reply\n");
978 goto drop;
979 }
980
981 if (skb->len < ntohs(h->tot_len))
982 goto drop;
983
984 if (ip_fast_csum((char *) h, h->ihl))
985 goto drop;
986
987 if (b->udph.source != htons(67) || b->udph.dest != htons(68))
988 goto drop;
989
990 if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
991 goto drop;
992
993 len = ntohs(b->udph.len) - sizeof(struct udphdr);
994 ext_len = len - (sizeof(*b) -
995 sizeof(struct iphdr) -
996 sizeof(struct udphdr) -
997 sizeof(b->exten));
998 if (ext_len < 0)
999 goto drop;
1000
1001
1002 if (!pskb_may_pull(skb, skb->len))
1003 goto drop;
1004
1005 b = (struct bootp_pkt *)skb_network_header(skb);
1006 h = &b->iph;
1007
1008
1009 spin_lock(&ic_recv_lock);
1010
1011
1012 if (ic_got_reply)
1013 goto drop_unlock;
1014
1015
1016 d = ic_first_dev;
1017 while (d && d->dev != dev)
1018 d = d->next;
1019 if (!d)
1020 goto drop_unlock;
1021
1022
1023 if (b->op != BOOTP_REPLY ||
1024 b->xid != d->xid) {
1025 net_err_ratelimited("DHCP/BOOTP: Reply not for us, op[%x] xid[%x]\n",
1026 b->op, b->xid);
1027 goto drop_unlock;
1028 }
1029
1030
1031 if (b->xid != ic_dev_xid) {
1032 net_err_ratelimited("DHCP/BOOTP: Ignoring delayed packet\n");
1033 goto drop_unlock;
1034 }
1035
1036
1037 if (ext_len >= 4 &&
1038 !memcmp(b->exten, ic_bootp_cookie, 4)) {
1039 u8 *end = (u8 *) b + ntohs(b->iph.tot_len);
1040 u8 *ext;
1041
1042#ifdef IPCONFIG_DHCP
1043 if (ic_proto_enabled & IC_USE_DHCP) {
1044 __be32 server_id = NONE;
1045 int mt = 0;
1046
1047 ext = &b->exten[4];
1048 while (ext < end && *ext != 0xff) {
1049 u8 *opt = ext++;
1050 if (*opt == 0)
1051 continue;
1052 ext += *ext + 1;
1053 if (ext >= end)
1054 break;
1055 switch (*opt) {
1056 case 53:
1057 if (opt[1])
1058 mt = opt[2];
1059 break;
1060 case 54:
1061 if (opt[1] >= 4)
1062 memcpy(&server_id, opt + 2, 4);
1063 break;
1064 }
1065 }
1066
1067#ifdef IPCONFIG_DEBUG
1068 printk("DHCP: Got message type %d\n", mt);
1069#endif
1070
1071 switch (mt) {
1072 case DHCPOFFER:
1073
1074
1075
1076 if (ic_myaddr != NONE)
1077 goto drop_unlock;
1078
1079
1080 ic_myaddr = b->your_ip;
1081 ic_servaddr = server_id;
1082#ifdef IPCONFIG_DEBUG
1083 printk("DHCP: Offered address %pI4 by server %pI4\n",
1084 &ic_myaddr, &b->iph.saddr);
1085#endif
1086
1087
1088
1089
1090 if ((server_id != NONE) &&
1091 (b->server_ip != server_id))
1092 b->server_ip = ic_servaddr;
1093 break;
1094
1095 case DHCPACK:
1096 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0)
1097 goto drop_unlock;
1098
1099
1100 break;
1101
1102 default:
1103
1104 ic_myaddr = NONE;
1105 ic_servaddr = NONE;
1106 goto drop_unlock;
1107 }
1108
1109 ic_dhcp_msgtype = mt;
1110
1111 }
1112#endif
1113
1114 ext = &b->exten[4];
1115 while (ext < end && *ext != 0xff) {
1116 u8 *opt = ext++;
1117 if (*opt == 0)
1118 continue;
1119 ext += *ext + 1;
1120 if (ext < end)
1121 ic_do_bootp_ext(opt);
1122 }
1123 }
1124
1125
1126 ic_dev = dev;
1127 ic_myaddr = b->your_ip;
1128 ic_servaddr = b->server_ip;
1129 ic_addrservaddr = b->iph.saddr;
1130 if (ic_gateway == NONE && b->relay_ip)
1131 ic_gateway = b->relay_ip;
1132 if (ic_nameservers[0] == NONE)
1133 ic_nameservers[0] = ic_servaddr;
1134 ic_got_reply = IC_BOOTP;
1135
1136drop_unlock:
1137
1138 spin_unlock(&ic_recv_lock);
1139
1140drop:
1141
1142 kfree_skb(skb);
1143
1144 return 0;
1145}
1146
1147
1148#endif
1149
1150
1151
1152
1153
1154
1155#ifdef IPCONFIG_DYNAMIC
1156
1157static int __init ic_dynamic(void)
1158{
1159 int retries;
1160 struct ic_device *d;
1161 unsigned long start_jiffies, timeout, jiff;
1162 int do_bootp = ic_proto_have_if & IC_BOOTP;
1163 int do_rarp = ic_proto_have_if & IC_RARP;
1164
1165
1166
1167
1168
1169
1170 if (!ic_proto_enabled) {
1171 pr_err("IP-Config: Incomplete network configuration information\n");
1172 return -1;
1173 }
1174
1175#ifdef IPCONFIG_BOOTP
1176 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
1177 pr_err("DHCP/BOOTP: No suitable device found\n");
1178#endif
1179#ifdef IPCONFIG_RARP
1180 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)
1181 pr_err("RARP: No suitable device found\n");
1182#endif
1183
1184 if (!ic_proto_have_if)
1185
1186 return -1;
1187
1188
1189
1190
1191#ifdef IPCONFIG_BOOTP
1192 if (do_bootp)
1193 ic_bootp_init();
1194#endif
1195#ifdef IPCONFIG_RARP
1196 if (do_rarp)
1197 ic_rarp_init();
1198#endif
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208 pr_notice("Sending %s%s%s requests .",
1209 do_bootp
1210 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "",
1211 (do_bootp && do_rarp) ? " and " : "",
1212 do_rarp ? "RARP" : "");
1213
1214 start_jiffies = jiffies;
1215 d = ic_first_dev;
1216 retries = CONF_SEND_RETRIES;
1217 get_random_bytes(&timeout, sizeof(timeout));
1218 timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned int) CONF_TIMEOUT_RANDOM);
1219 for (;;) {
1220#ifdef IPCONFIG_BOOTP
1221
1222 ic_dev_xid = d->xid;
1223
1224 if (do_bootp && (d->able & IC_BOOTP))
1225 ic_bootp_send_if(d, jiffies - start_jiffies);
1226#endif
1227#ifdef IPCONFIG_RARP
1228 if (do_rarp && (d->able & IC_RARP))
1229 ic_rarp_send_if(d);
1230#endif
1231
1232 jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout);
1233 while (time_before(jiffies, jiff) && !ic_got_reply)
1234 schedule_timeout_uninterruptible(1);
1235#ifdef IPCONFIG_DHCP
1236
1237 if ((ic_got_reply & IC_BOOTP) &&
1238 (ic_proto_enabled & IC_USE_DHCP) &&
1239 ic_dhcp_msgtype != DHCPACK) {
1240 ic_got_reply = 0;
1241 pr_cont(",");
1242 continue;
1243 }
1244#endif
1245
1246 if (ic_got_reply) {
1247 pr_cont(" OK\n");
1248 break;
1249 }
1250
1251 if ((d = d->next))
1252 continue;
1253
1254 if (! --retries) {
1255 pr_cont(" timed out!\n");
1256 break;
1257 }
1258
1259 d = ic_first_dev;
1260
1261 timeout = timeout CONF_TIMEOUT_MULT;
1262 if (timeout > CONF_TIMEOUT_MAX)
1263 timeout = CONF_TIMEOUT_MAX;
1264
1265 pr_cont(".");
1266 }
1267
1268#ifdef IPCONFIG_BOOTP
1269 if (do_bootp)
1270 ic_bootp_cleanup();
1271#endif
1272#ifdef IPCONFIG_RARP
1273 if (do_rarp)
1274 ic_rarp_cleanup();
1275#endif
1276
1277 if (!ic_got_reply) {
1278 ic_myaddr = NONE;
1279 return -1;
1280 }
1281
1282 printk("IP-Config: Got %s answer from %pI4, ",
1283 ((ic_got_reply & IC_RARP) ? "RARP"
1284 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),
1285 &ic_addrservaddr);
1286 pr_cont("my address is %pI4\n", &ic_myaddr);
1287
1288 return 0;
1289}
1290
1291#endif
1292
1293#ifdef CONFIG_PROC_FS
1294
1295static int pnp_seq_show(struct seq_file *seq, void *v)
1296{
1297 int i;
1298
1299 if (ic_proto_used & IC_PROTO)
1300 seq_printf(seq, "#PROTO: %s\n",
1301 (ic_proto_used & IC_RARP) ? "RARP"
1302 : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP");
1303 else
1304 seq_puts(seq, "#MANUAL\n");
1305
1306 if (ic_domain[0])
1307 seq_printf(seq,
1308 "domain %s\n", ic_domain);
1309 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {
1310 if (ic_nameservers[i] != NONE)
1311 seq_printf(seq, "nameserver %pI4\n",
1312 &ic_nameservers[i]);
1313 }
1314 if (ic_servaddr != NONE)
1315 seq_printf(seq, "bootserver %pI4\n",
1316 &ic_servaddr);
1317 return 0;
1318}
1319
1320static int pnp_seq_open(struct inode *indoe, struct file *file)
1321{
1322 return single_open(file, pnp_seq_show, NULL);
1323}
1324
1325static const struct file_operations pnp_seq_fops = {
1326 .owner = THIS_MODULE,
1327 .open = pnp_seq_open,
1328 .read = seq_read,
1329 .llseek = seq_lseek,
1330 .release = single_release,
1331};
1332#endif
1333
1334
1335
1336
1337
1338
1339__be32 __init root_nfs_parse_addr(char *name)
1340{
1341 __be32 addr;
1342 int octets = 0;
1343 char *cp, *cq;
1344
1345 cp = cq = name;
1346 while (octets < 4) {
1347 while (*cp >= '0' && *cp <= '9')
1348 cp++;
1349 if (cp == cq || cp - cq > 3)
1350 break;
1351 if (*cp == '.' || octets == 3)
1352 octets++;
1353 if (octets < 4)
1354 cp++;
1355 cq = cp;
1356 }
1357 if (octets == 4 && (*cp == ':' || *cp == '\0')) {
1358 if (*cp == ':')
1359 *cp++ = '\0';
1360 addr = in_aton(name);
1361 memmove(name, cp, strlen(cp) + 1);
1362 } else
1363 addr = NONE;
1364
1365 return addr;
1366}
1367
1368#define DEVICE_WAIT_MAX 12
1369
1370static int __init wait_for_devices(void)
1371{
1372 int i;
1373
1374 for (i = 0; i < DEVICE_WAIT_MAX; i++) {
1375 struct net_device *dev;
1376 int found = 0;
1377
1378 rtnl_lock();
1379 for_each_netdev(&init_net, dev) {
1380 if (ic_is_init_dev(dev)) {
1381 found = 1;
1382 break;
1383 }
1384 }
1385 rtnl_unlock();
1386 if (found)
1387 return 0;
1388 ssleep(1);
1389 }
1390 return -ENODEV;
1391}
1392
1393
1394
1395
1396
1397static int __init ip_auto_config(void)
1398{
1399 __be32 addr;
1400#ifdef IPCONFIG_DYNAMIC
1401 int retries = CONF_OPEN_RETRIES;
1402#endif
1403 int err;
1404 unsigned int i;
1405
1406#ifdef CONFIG_PROC_FS
1407 proc_create("pnp", S_IRUGO, init_net.proc_net, &pnp_seq_fops);
1408#endif
1409
1410 if (!ic_enable)
1411 return 0;
1412
1413 DBG(("IP-Config: Entered.\n"));
1414#ifdef IPCONFIG_DYNAMIC
1415 try_try_again:
1416#endif
1417
1418 err = wait_for_devices();
1419 if (err)
1420 return err;
1421
1422
1423 err = ic_open_devs();
1424 if (err)
1425 return err;
1426
1427
1428 msleep(CONF_POST_OPEN);
1429
1430
1431
1432
1433
1434
1435
1436 if (ic_myaddr == NONE ||
1437#ifdef CONFIG_ROOT_NFS
1438 (root_server_addr == NONE &&
1439 ic_servaddr == NONE &&
1440 ROOT_DEV == Root_NFS) ||
1441#endif
1442 ic_first_dev->next) {
1443#ifdef IPCONFIG_DYNAMIC
1444 if (ic_dynamic() < 0) {
1445 ic_close_devs();
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461#ifdef CONFIG_ROOT_NFS
1462 if (ROOT_DEV == Root_NFS) {
1463 pr_err("IP-Config: Retrying forever (NFS root)...\n");
1464 goto try_try_again;
1465 }
1466#endif
1467
1468 if (--retries) {
1469 pr_err("IP-Config: Reopening network devices...\n");
1470 goto try_try_again;
1471 }
1472
1473
1474 pr_err("IP-Config: Auto-configuration of network failed\n");
1475 return -1;
1476 }
1477#else
1478 pr_err("IP-Config: Incomplete network configuration information\n");
1479 ic_close_devs();
1480 return -1;
1481#endif
1482 } else {
1483
1484 ic_dev = ic_first_dev->dev;
1485 }
1486
1487 addr = root_nfs_parse_addr(root_server_path);
1488 if (root_server_addr == NONE)
1489 root_server_addr = addr;
1490
1491
1492
1493
1494 if (ic_defaults() < 0)
1495 return -1;
1496
1497
1498
1499
1500
1501 ic_close_devs();
1502 if (ic_setup_if() < 0 || ic_setup_routes() < 0)
1503 return -1;
1504
1505
1506
1507
1508#ifdef IPCONFIG_DYNAMIC
1509 ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP);
1510#endif
1511
1512#ifndef IPCONFIG_SILENT
1513
1514
1515
1516 pr_info("IP-Config: Complete:\n");
1517
1518 pr_info(" device=%s, hwaddr=%*phC, ipaddr=%pI4, mask=%pI4, gw=%pI4\n",
1519 ic_dev->name, ic_dev->addr_len, ic_dev->dev_addr,
1520 &ic_myaddr, &ic_netmask, &ic_gateway);
1521 pr_info(" host=%s, domain=%s, nis-domain=%s\n",
1522 utsname()->nodename, ic_domain, utsname()->domainname);
1523 pr_info(" bootserver=%pI4, rootserver=%pI4, rootpath=%s",
1524 &ic_servaddr, &root_server_addr, root_server_path);
1525 if (ic_dev_mtu)
1526 pr_cont(", mtu=%d", ic_dev_mtu);
1527 for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
1528 if (ic_nameservers[i] != NONE) {
1529 pr_info(" nameserver%u=%pI4",
1530 i, &ic_nameservers[i]);
1531 break;
1532 }
1533 for (i++; i < CONF_NAMESERVERS_MAX; i++)
1534 if (ic_nameservers[i] != NONE)
1535 pr_cont(", nameserver%u=%pI4", i, &ic_nameservers[i]);
1536 pr_cont("\n");
1537#endif
1538
1539 return 0;
1540}
1541
1542late_initcall(ip_auto_config);
1543
1544
1545
1546
1547
1548
1549static int __init ic_proto_name(char *name)
1550{
1551 if (!strcmp(name, "on") || !strcmp(name, "any")) {
1552 return 1;
1553 }
1554 if (!strcmp(name, "off") || !strcmp(name, "none")) {
1555 return 0;
1556 }
1557#ifdef CONFIG_IP_PNP_DHCP
1558 else if (!strcmp(name, "dhcp")) {
1559 ic_proto_enabled &= ~IC_RARP;
1560 return 1;
1561 }
1562#endif
1563#ifdef CONFIG_IP_PNP_BOOTP
1564 else if (!strcmp(name, "bootp")) {
1565 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP);
1566 return 1;
1567 }
1568#endif
1569#ifdef CONFIG_IP_PNP_RARP
1570 else if (!strcmp(name, "rarp")) {
1571 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP);
1572 return 1;
1573 }
1574#endif
1575#ifdef IPCONFIG_DYNAMIC
1576 else if (!strcmp(name, "both")) {
1577 ic_proto_enabled &= ~IC_USE_DHCP;
1578 return 1;
1579 }
1580#endif
1581 return 0;
1582}
1583
1584static int __init ip_auto_config_setup(char *addrs)
1585{
1586 char *cp, *ip, *dp;
1587 int num = 0;
1588
1589 ic_set_manually = 1;
1590 ic_enable = 1;
1591
1592
1593
1594
1595
1596 if (ic_proto_name(addrs))
1597 return 1;
1598
1599
1600 if (*addrs == 0 ||
1601 strcmp(addrs, "off") == 0 ||
1602 strcmp(addrs, "none") == 0) {
1603 ic_enable = 0;
1604 return 1;
1605 }
1606
1607 ic_nameservers_predef();
1608
1609
1610 ip = addrs;
1611 while (ip && *ip) {
1612 if ((cp = strchr(ip, ':')))
1613 *cp++ = '\0';
1614 if (strlen(ip) > 0) {
1615 DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip));
1616 switch (num) {
1617 case 0:
1618 if ((ic_myaddr = in_aton(ip)) == ANY)
1619 ic_myaddr = NONE;
1620 break;
1621 case 1:
1622 if ((ic_servaddr = in_aton(ip)) == ANY)
1623 ic_servaddr = NONE;
1624 break;
1625 case 2:
1626 if ((ic_gateway = in_aton(ip)) == ANY)
1627 ic_gateway = NONE;
1628 break;
1629 case 3:
1630 if ((ic_netmask = in_aton(ip)) == ANY)
1631 ic_netmask = NONE;
1632 break;
1633 case 4:
1634 if ((dp = strchr(ip, '.'))) {
1635 *dp++ = '\0';
1636 strlcpy(utsname()->domainname, dp,
1637 sizeof(utsname()->domainname));
1638 }
1639 strlcpy(utsname()->nodename, ip,
1640 sizeof(utsname()->nodename));
1641 ic_host_name_set = 1;
1642 break;
1643 case 5:
1644 strlcpy(user_dev_name, ip, sizeof(user_dev_name));
1645 break;
1646 case 6:
1647 if (ic_proto_name(ip) == 0 &&
1648 ic_myaddr == NONE) {
1649 ic_enable = 0;
1650 }
1651 break;
1652 case 7:
1653 if (CONF_NAMESERVERS_MAX >= 1) {
1654 ic_nameservers[0] = in_aton(ip);
1655 if (ic_nameservers[0] == ANY)
1656 ic_nameservers[0] = NONE;
1657 }
1658 break;
1659 case 8:
1660 if (CONF_NAMESERVERS_MAX >= 2) {
1661 ic_nameservers[1] = in_aton(ip);
1662 if (ic_nameservers[1] == ANY)
1663 ic_nameservers[1] = NONE;
1664 }
1665 break;
1666 }
1667 }
1668 ip = cp;
1669 num++;
1670 }
1671
1672 return 1;
1673}
1674__setup("ip=", ip_auto_config_setup);
1675
1676static int __init nfsaddrs_config_setup(char *addrs)
1677{
1678 return ip_auto_config_setup(addrs);
1679}
1680__setup("nfsaddrs=", nfsaddrs_config_setup);
1681
1682static int __init vendor_class_identifier_setup(char *addrs)
1683{
1684 if (strlcpy(vendor_class_identifier, addrs,
1685 sizeof(vendor_class_identifier))
1686 >= sizeof(vendor_class_identifier))
1687 pr_warn("DHCP: vendorclass too long, truncated to \"%s\"",
1688 vendor_class_identifier);
1689 return 1;
1690}
1691__setup("dhcpclass=", vendor_class_identifier_setup);
1692