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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, 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))
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 next_msg = start + msecs_to_jiffies(CONF_CARRIER_TIMEOUT/12);
267 while (jiffies - start < msecs_to_jiffies(CONF_CARRIER_TIMEOUT)) {
268 int wait, elapsed;
269
270 for_each_netdev(&init_net, dev)
271 if (ic_is_init_dev(dev) && netif_carrier_ok(dev))
272 goto have_carrier;
273
274 msleep(1);
275
276 if time_before(jiffies, next_msg)
277 continue;
278
279 elapsed = jiffies_to_msecs(jiffies - start);
280 wait = (CONF_CARRIER_TIMEOUT - elapsed + 500)/1000;
281 pr_info("Waiting up to %d more seconds for network.\n", wait);
282 next_msg = jiffies + msecs_to_jiffies(CONF_CARRIER_TIMEOUT/12);
283 }
284have_carrier:
285 rtnl_unlock();
286
287 *last = NULL;
288
289 if (!ic_first_dev) {
290 if (user_dev_name[0])
291 pr_err("IP-Config: Device `%s' not found\n",
292 user_dev_name);
293 else
294 pr_err("IP-Config: No network devices available\n");
295 return -ENODEV;
296 }
297 return 0;
298}
299
300static void __init ic_close_devs(void)
301{
302 struct ic_device *d, *next;
303 struct net_device *dev;
304
305 rtnl_lock();
306 next = ic_first_dev;
307 while ((d = next)) {
308 next = d->next;
309 dev = d->dev;
310 if (dev != ic_dev) {
311 DBG(("IP-Config: Downing %s\n", dev->name));
312 dev_change_flags(dev, d->flags);
313 }
314 kfree(d);
315 }
316 rtnl_unlock();
317}
318
319
320
321
322
323static inline void
324set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port)
325{
326 sin->sin_family = AF_INET;
327 sin->sin_addr.s_addr = addr;
328 sin->sin_port = port;
329}
330
331static int __init ic_devinet_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 = devinet_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
338 set_fs(oldfs);
339 return res;
340}
341
342static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg)
343{
344 int res;
345
346 mm_segment_t oldfs = get_fs();
347 set_fs(get_ds());
348 res = dev_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
349 set_fs(oldfs);
350 return res;
351}
352
353static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg)
354{
355 int res;
356
357 mm_segment_t oldfs = get_fs();
358 set_fs(get_ds());
359 res = ip_rt_ioctl(&init_net, cmd, (void __user *) arg);
360 set_fs(oldfs);
361 return res;
362}
363
364
365
366
367
368static int __init ic_setup_if(void)
369{
370 struct ifreq ir;
371 struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr;
372 int err;
373
374 memset(&ir, 0, sizeof(ir));
375 strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name);
376 set_sockaddr(sin, ic_myaddr, 0);
377 if ((err = ic_devinet_ioctl(SIOCSIFADDR, &ir)) < 0) {
378 pr_err("IP-Config: Unable to set interface address (%d)\n",
379 err);
380 return -1;
381 }
382 set_sockaddr(sin, ic_netmask, 0);
383 if ((err = ic_devinet_ioctl(SIOCSIFNETMASK, &ir)) < 0) {
384 pr_err("IP-Config: Unable to set interface netmask (%d)\n",
385 err);
386 return -1;
387 }
388 set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0);
389 if ((err = ic_devinet_ioctl(SIOCSIFBRDADDR, &ir)) < 0) {
390 pr_err("IP-Config: Unable to set interface broadcast address (%d)\n",
391 err);
392 return -1;
393 }
394
395
396
397
398 if (ic_dev_mtu != 0) {
399 strcpy(ir.ifr_name, ic_dev->name);
400 ir.ifr_mtu = ic_dev_mtu;
401 if ((err = ic_dev_ioctl(SIOCSIFMTU, &ir)) < 0)
402 pr_err("IP-Config: Unable to set interface mtu to %d (%d)\n",
403 ic_dev_mtu, err);
404 }
405 return 0;
406}
407
408static int __init ic_setup_routes(void)
409{
410
411
412 if (ic_gateway != NONE) {
413 struct rtentry rm;
414 int err;
415
416 memset(&rm, 0, sizeof(rm));
417 if ((ic_gateway ^ ic_myaddr) & ic_netmask) {
418 pr_err("IP-Config: Gateway not on directly connected network\n");
419 return -1;
420 }
421 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0);
422 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0);
423 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0);
424 rm.rt_flags = RTF_UP | RTF_GATEWAY;
425 if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) {
426 pr_err("IP-Config: Cannot add default route (%d)\n",
427 err);
428 return -1;
429 }
430 }
431
432 return 0;
433}
434
435
436
437
438
439static int __init ic_defaults(void)
440{
441
442
443
444
445
446 if (!ic_host_name_set)
447 sprintf(init_utsname()->nodename, "%pI4", &ic_myaddr);
448
449 if (root_server_addr == NONE)
450 root_server_addr = ic_servaddr;
451
452 if (ic_netmask == NONE) {
453 if (IN_CLASSA(ntohl(ic_myaddr)))
454 ic_netmask = htonl(IN_CLASSA_NET);
455 else if (IN_CLASSB(ntohl(ic_myaddr)))
456 ic_netmask = htonl(IN_CLASSB_NET);
457 else if (IN_CLASSC(ntohl(ic_myaddr)))
458 ic_netmask = htonl(IN_CLASSC_NET);
459 else {
460 pr_err("IP-Config: Unable to guess netmask for address %pI4\n",
461 &ic_myaddr);
462 return -1;
463 }
464 printk("IP-Config: Guessing netmask %pI4\n", &ic_netmask);
465 }
466
467 return 0;
468}
469
470
471
472
473
474#ifdef IPCONFIG_RARP
475
476static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
477
478static struct packet_type rarp_packet_type __initdata = {
479 .type = cpu_to_be16(ETH_P_RARP),
480 .func = ic_rarp_recv,
481};
482
483static inline void __init ic_rarp_init(void)
484{
485 dev_add_pack(&rarp_packet_type);
486}
487
488static inline void __init ic_rarp_cleanup(void)
489{
490 dev_remove_pack(&rarp_packet_type);
491}
492
493
494
495
496static int __init
497ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
498{
499 struct arphdr *rarp;
500 unsigned char *rarp_ptr;
501 __be32 sip, tip;
502 unsigned char *sha, *tha;
503 struct ic_device *d;
504
505 if (!net_eq(dev_net(dev), &init_net))
506 goto drop;
507
508 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
509 return NET_RX_DROP;
510
511 if (!pskb_may_pull(skb, sizeof(struct arphdr)))
512 goto drop;
513
514
515 rarp = (struct arphdr *)skb_transport_header(skb);
516
517
518
519
520 if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd))
521 goto drop;
522
523
524 if (rarp->ar_op != htons(ARPOP_RREPLY))
525 goto drop;
526
527
528 if (rarp->ar_pro != htons(ETH_P_IP))
529 goto drop;
530
531 if (!pskb_may_pull(skb, arp_hdr_len(dev)))
532 goto drop;
533
534
535 rarp = (struct arphdr *)skb_transport_header(skb);
536 rarp_ptr = (unsigned char *) (rarp + 1);
537
538
539 spin_lock(&ic_recv_lock);
540
541
542 if (ic_got_reply)
543 goto drop_unlock;
544
545
546 d = ic_first_dev;
547 while (d && d->dev != dev)
548 d = d->next;
549 if (!d)
550 goto drop_unlock;
551
552
553 sha = rarp_ptr;
554 rarp_ptr += dev->addr_len;
555 memcpy(&sip, rarp_ptr, 4);
556 rarp_ptr += 4;
557 tha = rarp_ptr;
558 rarp_ptr += dev->addr_len;
559 memcpy(&tip, rarp_ptr, 4);
560
561
562 if (memcmp(tha, dev->dev_addr, dev->addr_len))
563 goto drop_unlock;
564
565
566 if (ic_servaddr != NONE && ic_servaddr != sip)
567 goto drop_unlock;
568
569
570 ic_dev = dev;
571 if (ic_myaddr == NONE)
572 ic_myaddr = tip;
573 ic_servaddr = sip;
574 ic_addrservaddr = sip;
575 ic_got_reply = IC_RARP;
576
577drop_unlock:
578
579 spin_unlock(&ic_recv_lock);
580
581drop:
582
583 kfree_skb(skb);
584 return 0;
585}
586
587
588
589
590
591static void __init ic_rarp_send_if(struct ic_device *d)
592{
593 struct net_device *dev = d->dev;
594 arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL,
595 dev->dev_addr, dev->dev_addr);
596}
597#endif
598
599
600
601
602static inline void __init ic_nameservers_predef(void)
603{
604 int i;
605
606 for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
607 ic_nameservers[i] = NONE;
608}
609
610
611
612
613
614#ifdef IPCONFIG_BOOTP
615
616struct bootp_pkt {
617 struct iphdr iph;
618 struct udphdr udph;
619 u8 op;
620 u8 htype;
621 u8 hlen;
622 u8 hops;
623 __be32 xid;
624 __be16 secs;
625 __be16 flags;
626 __be32 client_ip;
627 __be32 your_ip;
628 __be32 server_ip;
629 __be32 relay_ip;
630 u8 hw_addr[16];
631 u8 serv_name[64];
632 u8 boot_file[128];
633 u8 exten[312];
634};
635
636
637#define BOOTP_REQUEST 1
638#define BOOTP_REPLY 2
639
640
641#define DHCPDISCOVER 1
642#define DHCPOFFER 2
643#define DHCPREQUEST 3
644#define DHCPDECLINE 4
645#define DHCPACK 5
646#define DHCPNAK 6
647#define DHCPRELEASE 7
648#define DHCPINFORM 8
649
650static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
651
652static struct packet_type bootp_packet_type __initdata = {
653 .type = cpu_to_be16(ETH_P_IP),
654 .func = ic_bootp_recv,
655};
656
657
658
659
660
661
662static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 };
663
664#ifdef IPCONFIG_DHCP
665
666static void __init
667ic_dhcp_init_options(u8 *options)
668{
669 u8 mt = ((ic_servaddr == NONE)
670 ? DHCPDISCOVER : DHCPREQUEST);
671 u8 *e = options;
672 int len;
673
674#ifdef IPCONFIG_DEBUG
675 printk("DHCP: Sending message type %d\n", mt);
676#endif
677
678 memcpy(e, ic_bootp_cookie, 4);
679 e += 4;
680
681 *e++ = 53;
682 *e++ = 1;
683 *e++ = mt;
684
685 if (mt == DHCPREQUEST) {
686 *e++ = 54;
687 *e++ = 4;
688 memcpy(e, &ic_servaddr, 4);
689 e += 4;
690
691 *e++ = 50;
692 *e++ = 4;
693 memcpy(e, &ic_myaddr, 4);
694 e += 4;
695 }
696
697
698 {
699 static const u8 ic_req_params[] = {
700 1,
701 3,
702 6,
703 12,
704 15,
705 17,
706 26,
707 40,
708 };
709
710 *e++ = 55;
711 *e++ = sizeof(ic_req_params);
712 memcpy(e, ic_req_params, sizeof(ic_req_params));
713 e += sizeof(ic_req_params);
714
715 if (ic_host_name_set) {
716 *e++ = 12;
717 len = strlen(utsname()->nodename);
718 *e++ = len;
719 memcpy(e, utsname()->nodename, len);
720 e += len;
721 }
722 if (*vendor_class_identifier) {
723 pr_info("DHCP: sending class identifier \"%s\"\n",
724 vendor_class_identifier);
725 *e++ = 60;
726 len = strlen(vendor_class_identifier);
727 *e++ = len;
728 memcpy(e, vendor_class_identifier, len);
729 e += len;
730 }
731 }
732
733 *e++ = 255;
734}
735
736#endif
737
738static void __init ic_bootp_init_ext(u8 *e)
739{
740 memcpy(e, ic_bootp_cookie, 4);
741 e += 4;
742 *e++ = 1;
743 *e++ = 4;
744 e += 4;
745 *e++ = 3;
746 *e++ = 4;
747 e += 4;
748 *e++ = 5;
749 *e++ = 8;
750 e += 8;
751 *e++ = 12;
752 *e++ = 32;
753 e += 32;
754 *e++ = 40;
755 *e++ = 32;
756 e += 32;
757 *e++ = 17;
758 *e++ = 40;
759 e += 40;
760
761 *e++ = 57;
762 *e++ = 2;
763 *e++ = 1;
764 *e++ = 150;
765
766 *e++ = 255;
767}
768
769
770
771
772
773static inline void __init ic_bootp_init(void)
774{
775 ic_nameservers_predef();
776
777 dev_add_pack(&bootp_packet_type);
778}
779
780
781
782
783
784static inline void __init ic_bootp_cleanup(void)
785{
786 dev_remove_pack(&bootp_packet_type);
787}
788
789
790
791
792
793static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff)
794{
795 struct net_device *dev = d->dev;
796 struct sk_buff *skb;
797 struct bootp_pkt *b;
798 struct iphdr *h;
799 int hlen = LL_RESERVED_SPACE(dev);
800 int tlen = dev->needed_tailroom;
801
802
803 skb = alloc_skb(sizeof(struct bootp_pkt) + hlen + tlen + 15,
804 GFP_KERNEL);
805 if (!skb)
806 return;
807 skb_reserve(skb, hlen);
808 b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt));
809 memset(b, 0, sizeof(struct bootp_pkt));
810
811
812 skb_reset_network_header(skb);
813 h = ip_hdr(skb);
814 h->version = 4;
815 h->ihl = 5;
816 h->tot_len = htons(sizeof(struct bootp_pkt));
817 h->frag_off = htons(IP_DF);
818 h->ttl = 64;
819 h->protocol = IPPROTO_UDP;
820 h->daddr = htonl(INADDR_BROADCAST);
821 h->check = ip_fast_csum((unsigned char *) h, h->ihl);
822
823
824 b->udph.source = htons(68);
825 b->udph.dest = htons(67);
826 b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr));
827
828
829
830 b->op = BOOTP_REQUEST;
831 if (dev->type < 256)
832 b->htype = dev->type;
833 else if (dev->type == ARPHRD_FDDI)
834 b->htype = ARPHRD_ETHER;
835 else {
836 printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name);
837 b->htype = dev->type;
838 }
839
840
841 b->hlen = dev->addr_len;
842 memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
843 b->secs = htons(jiffies_diff / HZ);
844 b->xid = d->xid;
845
846
847#ifdef IPCONFIG_DHCP
848 if (ic_proto_enabled & IC_USE_DHCP)
849 ic_dhcp_init_options(b->exten);
850 else
851#endif
852 ic_bootp_init_ext(b->exten);
853
854
855 skb->dev = dev;
856 skb->protocol = htons(ETH_P_IP);
857 if (dev_hard_header(skb, dev, ntohs(skb->protocol),
858 dev->broadcast, dev->dev_addr, skb->len) < 0) {
859 kfree_skb(skb);
860 printk("E");
861 return;
862 }
863
864 if (dev_queue_xmit(skb) < 0)
865 printk("E");
866}
867
868
869
870
871
872static int __init ic_bootp_string(char *dest, char *src, int len, int max)
873{
874 if (!len)
875 return 0;
876 if (len > max-1)
877 len = max-1;
878 memcpy(dest, src, len);
879 dest[len] = '\0';
880 return 1;
881}
882
883
884
885
886
887static void __init ic_do_bootp_ext(u8 *ext)
888{
889 u8 servers;
890 int i;
891 __be16 mtu;
892
893#ifdef IPCONFIG_DEBUG
894 u8 *c;
895
896 printk("DHCP/BOOTP: Got extension %d:",*ext);
897 for (c=ext+2; c<ext+2+ext[1]; c++)
898 printk(" %02x", *c);
899 printk("\n");
900#endif
901
902 switch (*ext++) {
903 case 1:
904 if (ic_netmask == NONE)
905 memcpy(&ic_netmask, ext+1, 4);
906 break;
907 case 3:
908 if (ic_gateway == NONE)
909 memcpy(&ic_gateway, ext+1, 4);
910 break;
911 case 6:
912 servers= *ext/4;
913 if (servers > CONF_NAMESERVERS_MAX)
914 servers = CONF_NAMESERVERS_MAX;
915 for (i = 0; i < servers; i++) {
916 if (ic_nameservers[i] == NONE)
917 memcpy(&ic_nameservers[i], ext+1+4*i, 4);
918 }
919 break;
920 case 12:
921 ic_bootp_string(utsname()->nodename, ext+1, *ext,
922 __NEW_UTS_LEN);
923 ic_host_name_set = 1;
924 break;
925 case 15:
926 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
927 break;
928 case 17:
929 if (!root_server_path[0])
930 ic_bootp_string(root_server_path, ext+1, *ext,
931 sizeof(root_server_path));
932 break;
933 case 26:
934 memcpy(&mtu, ext+1, sizeof(mtu));
935 ic_dev_mtu = ntohs(mtu);
936 break;
937 case 40:
938 ic_bootp_string(utsname()->domainname, ext+1, *ext,
939 __NEW_UTS_LEN);
940 break;
941 }
942}
943
944
945
946
947
948static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
949{
950 struct bootp_pkt *b;
951 struct iphdr *h;
952 struct ic_device *d;
953 int len, ext_len;
954
955 if (!net_eq(dev_net(dev), &init_net))
956 goto drop;
957
958
959 if (skb->pkt_type == PACKET_OTHERHOST)
960 goto drop;
961
962 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
963 return NET_RX_DROP;
964
965 if (!pskb_may_pull(skb,
966 sizeof(struct iphdr) +
967 sizeof(struct udphdr)))
968 goto drop;
969
970 b = (struct bootp_pkt *)skb_network_header(skb);
971 h = &b->iph;
972
973 if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP)
974 goto drop;
975
976
977 if (ip_is_fragment(h)) {
978 net_err_ratelimited("DHCP/BOOTP: Ignoring fragmented reply\n");
979 goto drop;
980 }
981
982 if (skb->len < ntohs(h->tot_len))
983 goto drop;
984
985 if (ip_fast_csum((char *) h, h->ihl))
986 goto drop;
987
988 if (b->udph.source != htons(67) || b->udph.dest != htons(68))
989 goto drop;
990
991 if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
992 goto drop;
993
994 len = ntohs(b->udph.len) - sizeof(struct udphdr);
995 ext_len = len - (sizeof(*b) -
996 sizeof(struct iphdr) -
997 sizeof(struct udphdr) -
998 sizeof(b->exten));
999 if (ext_len < 0)
1000 goto drop;
1001
1002
1003 if (!pskb_may_pull(skb, skb->len))
1004 goto drop;
1005
1006 b = (struct bootp_pkt *)skb_network_header(skb);
1007 h = &b->iph;
1008
1009
1010 spin_lock(&ic_recv_lock);
1011
1012
1013 if (ic_got_reply)
1014 goto drop_unlock;
1015
1016
1017 d = ic_first_dev;
1018 while (d && d->dev != dev)
1019 d = d->next;
1020 if (!d)
1021 goto drop_unlock;
1022
1023
1024 if (b->op != BOOTP_REPLY ||
1025 b->xid != d->xid) {
1026 net_err_ratelimited("DHCP/BOOTP: Reply not for us, op[%x] xid[%x]\n",
1027 b->op, b->xid);
1028 goto drop_unlock;
1029 }
1030
1031
1032 if (b->xid != ic_dev_xid) {
1033 net_err_ratelimited("DHCP/BOOTP: Ignoring delayed packet\n");
1034 goto drop_unlock;
1035 }
1036
1037
1038 if (ext_len >= 4 &&
1039 !memcmp(b->exten, ic_bootp_cookie, 4)) {
1040 u8 *end = (u8 *) b + ntohs(b->iph.tot_len);
1041 u8 *ext;
1042
1043#ifdef IPCONFIG_DHCP
1044 if (ic_proto_enabled & IC_USE_DHCP) {
1045 __be32 server_id = NONE;
1046 int mt = 0;
1047
1048 ext = &b->exten[4];
1049 while (ext < end && *ext != 0xff) {
1050 u8 *opt = ext++;
1051 if (*opt == 0)
1052 continue;
1053 ext += *ext + 1;
1054 if (ext >= end)
1055 break;
1056 switch (*opt) {
1057 case 53:
1058 if (opt[1])
1059 mt = opt[2];
1060 break;
1061 case 54:
1062 if (opt[1] >= 4)
1063 memcpy(&server_id, opt + 2, 4);
1064 break;
1065 }
1066 }
1067
1068#ifdef IPCONFIG_DEBUG
1069 printk("DHCP: Got message type %d\n", mt);
1070#endif
1071
1072 switch (mt) {
1073 case DHCPOFFER:
1074
1075
1076
1077 if (ic_myaddr != NONE)
1078 goto drop_unlock;
1079
1080
1081 ic_myaddr = b->your_ip;
1082 ic_servaddr = server_id;
1083#ifdef IPCONFIG_DEBUG
1084 printk("DHCP: Offered address %pI4 by server %pI4\n",
1085 &ic_myaddr, &b->iph.saddr);
1086#endif
1087
1088
1089
1090
1091 if ((server_id != NONE) &&
1092 (b->server_ip != server_id))
1093 b->server_ip = ic_servaddr;
1094 break;
1095
1096 case DHCPACK:
1097 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0)
1098 goto drop_unlock;
1099
1100
1101 break;
1102
1103 default:
1104
1105 ic_myaddr = NONE;
1106 ic_servaddr = NONE;
1107 goto drop_unlock;
1108 }
1109
1110 ic_dhcp_msgtype = mt;
1111
1112 }
1113#endif
1114
1115 ext = &b->exten[4];
1116 while (ext < end && *ext != 0xff) {
1117 u8 *opt = ext++;
1118 if (*opt == 0)
1119 continue;
1120 ext += *ext + 1;
1121 if (ext < end)
1122 ic_do_bootp_ext(opt);
1123 }
1124 }
1125
1126
1127 ic_dev = dev;
1128 ic_myaddr = b->your_ip;
1129 ic_servaddr = b->server_ip;
1130 ic_addrservaddr = b->iph.saddr;
1131 if (ic_gateway == NONE && b->relay_ip)
1132 ic_gateway = b->relay_ip;
1133 if (ic_nameservers[0] == NONE)
1134 ic_nameservers[0] = ic_servaddr;
1135 ic_got_reply = IC_BOOTP;
1136
1137drop_unlock:
1138
1139 spin_unlock(&ic_recv_lock);
1140
1141drop:
1142
1143 kfree_skb(skb);
1144
1145 return 0;
1146}
1147
1148
1149#endif
1150
1151
1152
1153
1154
1155
1156#ifdef IPCONFIG_DYNAMIC
1157
1158static int __init ic_dynamic(void)
1159{
1160 int retries;
1161 struct ic_device *d;
1162 unsigned long start_jiffies, timeout, jiff;
1163 int do_bootp = ic_proto_have_if & IC_BOOTP;
1164 int do_rarp = ic_proto_have_if & IC_RARP;
1165
1166
1167
1168
1169
1170
1171 if (!ic_proto_enabled) {
1172 pr_err("IP-Config: Incomplete network configuration information\n");
1173 return -1;
1174 }
1175
1176#ifdef IPCONFIG_BOOTP
1177 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
1178 pr_err("DHCP/BOOTP: No suitable device found\n");
1179#endif
1180#ifdef IPCONFIG_RARP
1181 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)
1182 pr_err("RARP: No suitable device found\n");
1183#endif
1184
1185 if (!ic_proto_have_if)
1186
1187 return -1;
1188
1189
1190
1191
1192#ifdef IPCONFIG_BOOTP
1193 if (do_bootp)
1194 ic_bootp_init();
1195#endif
1196#ifdef IPCONFIG_RARP
1197 if (do_rarp)
1198 ic_rarp_init();
1199#endif
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209 pr_notice("Sending %s%s%s requests .",
1210 do_bootp
1211 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "",
1212 (do_bootp && do_rarp) ? " and " : "",
1213 do_rarp ? "RARP" : "");
1214
1215 start_jiffies = jiffies;
1216 d = ic_first_dev;
1217 retries = CONF_SEND_RETRIES;
1218 get_random_bytes(&timeout, sizeof(timeout));
1219 timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned int) CONF_TIMEOUT_RANDOM);
1220 for (;;) {
1221
1222 ic_dev_xid = d->xid;
1223
1224#ifdef IPCONFIG_BOOTP
1225 if (do_bootp && (d->able & IC_BOOTP))
1226 ic_bootp_send_if(d, jiffies - start_jiffies);
1227#endif
1228#ifdef IPCONFIG_RARP
1229 if (do_rarp && (d->able & IC_RARP))
1230 ic_rarp_send_if(d);
1231#endif
1232
1233 jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout);
1234 while (time_before(jiffies, jiff) && !ic_got_reply)
1235 schedule_timeout_uninterruptible(1);
1236#ifdef IPCONFIG_DHCP
1237
1238 if ((ic_got_reply & IC_BOOTP) &&
1239 (ic_proto_enabled & IC_USE_DHCP) &&
1240 ic_dhcp_msgtype != DHCPACK) {
1241 ic_got_reply = 0;
1242 pr_cont(",");
1243 continue;
1244 }
1245#endif
1246
1247 if (ic_got_reply) {
1248 pr_cont(" OK\n");
1249 break;
1250 }
1251
1252 if ((d = d->next))
1253 continue;
1254
1255 if (! --retries) {
1256 pr_cont(" timed out!\n");
1257 break;
1258 }
1259
1260 d = ic_first_dev;
1261
1262 timeout = timeout CONF_TIMEOUT_MULT;
1263 if (timeout > CONF_TIMEOUT_MAX)
1264 timeout = CONF_TIMEOUT_MAX;
1265
1266 pr_cont(".");
1267 }
1268
1269#ifdef IPCONFIG_BOOTP
1270 if (do_bootp)
1271 ic_bootp_cleanup();
1272#endif
1273#ifdef IPCONFIG_RARP
1274 if (do_rarp)
1275 ic_rarp_cleanup();
1276#endif
1277
1278 if (!ic_got_reply) {
1279 ic_myaddr = NONE;
1280 return -1;
1281 }
1282
1283 printk("IP-Config: Got %s answer from %pI4, ",
1284 ((ic_got_reply & IC_RARP) ? "RARP"
1285 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),
1286 &ic_addrservaddr);
1287 pr_cont("my address is %pI4\n", &ic_myaddr);
1288
1289 return 0;
1290}
1291
1292#endif
1293
1294#ifdef CONFIG_PROC_FS
1295
1296static int pnp_seq_show(struct seq_file *seq, void *v)
1297{
1298 int i;
1299
1300 if (ic_proto_used & IC_PROTO)
1301 seq_printf(seq, "#PROTO: %s\n",
1302 (ic_proto_used & IC_RARP) ? "RARP"
1303 : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP");
1304 else
1305 seq_puts(seq, "#MANUAL\n");
1306
1307 if (ic_domain[0])
1308 seq_printf(seq,
1309 "domain %s\n", ic_domain);
1310 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {
1311 if (ic_nameservers[i] != NONE)
1312 seq_printf(seq, "nameserver %pI4\n",
1313 &ic_nameservers[i]);
1314 }
1315 if (ic_servaddr != NONE)
1316 seq_printf(seq, "bootserver %pI4\n",
1317 &ic_servaddr);
1318 return 0;
1319}
1320
1321static int pnp_seq_open(struct inode *indoe, struct file *file)
1322{
1323 return single_open(file, pnp_seq_show, NULL);
1324}
1325
1326static const struct file_operations pnp_seq_fops = {
1327 .owner = THIS_MODULE,
1328 .open = pnp_seq_open,
1329 .read = seq_read,
1330 .llseek = seq_lseek,
1331 .release = single_release,
1332};
1333#endif
1334
1335
1336
1337
1338
1339
1340__be32 __init root_nfs_parse_addr(char *name)
1341{
1342 __be32 addr;
1343 int octets = 0;
1344 char *cp, *cq;
1345
1346 cp = cq = name;
1347 while (octets < 4) {
1348 while (*cp >= '0' && *cp <= '9')
1349 cp++;
1350 if (cp == cq || cp - cq > 3)
1351 break;
1352 if (*cp == '.' || octets == 3)
1353 octets++;
1354 if (octets < 4)
1355 cp++;
1356 cq = cp;
1357 }
1358 if (octets == 4 && (*cp == ':' || *cp == '\0')) {
1359 if (*cp == ':')
1360 *cp++ = '\0';
1361 addr = in_aton(name);
1362 memmove(name, cp, strlen(cp) + 1);
1363 } else
1364 addr = NONE;
1365
1366 return addr;
1367}
1368
1369#define DEVICE_WAIT_MAX 12
1370
1371static int __init wait_for_devices(void)
1372{
1373 int i;
1374
1375 for (i = 0; i < DEVICE_WAIT_MAX; i++) {
1376 struct net_device *dev;
1377 int found = 0;
1378
1379 rtnl_lock();
1380 for_each_netdev(&init_net, dev) {
1381 if (ic_is_init_dev(dev)) {
1382 found = 1;
1383 break;
1384 }
1385 }
1386 rtnl_unlock();
1387 if (found)
1388 return 0;
1389 ssleep(1);
1390 }
1391 return -ENODEV;
1392}
1393
1394
1395
1396
1397
1398static int __init ip_auto_config(void)
1399{
1400 __be32 addr;
1401#ifdef IPCONFIG_DYNAMIC
1402 int retries = CONF_OPEN_RETRIES;
1403#endif
1404 int err;
1405 unsigned int i;
1406
1407#ifdef CONFIG_PROC_FS
1408 proc_create("pnp", S_IRUGO, init_net.proc_net, &pnp_seq_fops);
1409#endif
1410
1411 if (!ic_enable)
1412 return 0;
1413
1414 DBG(("IP-Config: Entered.\n"));
1415#ifdef IPCONFIG_DYNAMIC
1416 try_try_again:
1417#endif
1418
1419 err = wait_for_devices();
1420 if (err)
1421 return err;
1422
1423
1424 err = ic_open_devs();
1425 if (err)
1426 return err;
1427
1428
1429 msleep(CONF_POST_OPEN);
1430
1431
1432
1433
1434
1435
1436
1437 if (ic_myaddr == NONE ||
1438#ifdef CONFIG_ROOT_NFS
1439 (root_server_addr == NONE &&
1440 ic_servaddr == NONE &&
1441 ROOT_DEV == Root_NFS) ||
1442#endif
1443 ic_first_dev->next) {
1444#ifdef IPCONFIG_DYNAMIC
1445 if (ic_dynamic() < 0) {
1446 ic_close_devs();
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462#ifdef CONFIG_ROOT_NFS
1463 if (ROOT_DEV == Root_NFS) {
1464 pr_err("IP-Config: Retrying forever (NFS root)...\n");
1465 goto try_try_again;
1466 }
1467#endif
1468
1469 if (--retries) {
1470 pr_err("IP-Config: Reopening network devices...\n");
1471 goto try_try_again;
1472 }
1473
1474
1475 pr_err("IP-Config: Auto-configuration of network failed\n");
1476 return -1;
1477 }
1478#else
1479 pr_err("IP-Config: Incomplete network configuration information\n");
1480 ic_close_devs();
1481 return -1;
1482#endif
1483 } else {
1484
1485 ic_dev = ic_first_dev->dev;
1486 }
1487
1488 addr = root_nfs_parse_addr(root_server_path);
1489 if (root_server_addr == NONE)
1490 root_server_addr = addr;
1491
1492
1493
1494
1495 if (ic_defaults() < 0)
1496 return -1;
1497
1498
1499
1500
1501
1502 ic_close_devs();
1503 if (ic_setup_if() < 0 || ic_setup_routes() < 0)
1504 return -1;
1505
1506
1507
1508
1509#ifdef IPCONFIG_DYNAMIC
1510 ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP);
1511#endif
1512
1513#ifndef IPCONFIG_SILENT
1514
1515
1516
1517 pr_info("IP-Config: Complete:\n");
1518
1519 pr_info(" device=%s, hwaddr=%*phC, ipaddr=%pI4, mask=%pI4, gw=%pI4\n",
1520 ic_dev->name, ic_dev->addr_len, ic_dev->dev_addr,
1521 &ic_myaddr, &ic_netmask, &ic_gateway);
1522 pr_info(" host=%s, domain=%s, nis-domain=%s\n",
1523 utsname()->nodename, ic_domain, utsname()->domainname);
1524 pr_info(" bootserver=%pI4, rootserver=%pI4, rootpath=%s",
1525 &ic_servaddr, &root_server_addr, root_server_path);
1526 if (ic_dev_mtu)
1527 pr_cont(", mtu=%d", ic_dev_mtu);
1528 for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
1529 if (ic_nameservers[i] != NONE) {
1530 pr_info(" nameserver%u=%pI4",
1531 i, &ic_nameservers[i]);
1532 break;
1533 }
1534 for (i++; i < CONF_NAMESERVERS_MAX; i++)
1535 if (ic_nameservers[i] != NONE)
1536 pr_cont(", nameserver%u=%pI4", i, &ic_nameservers[i]);
1537 pr_cont("\n");
1538#endif
1539
1540 return 0;
1541}
1542
1543late_initcall(ip_auto_config);
1544
1545
1546
1547
1548
1549
1550static int __init ic_proto_name(char *name)
1551{
1552 if (!strcmp(name, "on") || !strcmp(name, "any")) {
1553 return 1;
1554 }
1555 if (!strcmp(name, "off") || !strcmp(name, "none")) {
1556 return 0;
1557 }
1558#ifdef CONFIG_IP_PNP_DHCP
1559 else if (!strcmp(name, "dhcp")) {
1560 ic_proto_enabled &= ~IC_RARP;
1561 return 1;
1562 }
1563#endif
1564#ifdef CONFIG_IP_PNP_BOOTP
1565 else if (!strcmp(name, "bootp")) {
1566 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP);
1567 return 1;
1568 }
1569#endif
1570#ifdef CONFIG_IP_PNP_RARP
1571 else if (!strcmp(name, "rarp")) {
1572 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP);
1573 return 1;
1574 }
1575#endif
1576#ifdef IPCONFIG_DYNAMIC
1577 else if (!strcmp(name, "both")) {
1578 ic_proto_enabled &= ~IC_USE_DHCP;
1579 return 1;
1580 }
1581#endif
1582 return 0;
1583}
1584
1585static int __init ip_auto_config_setup(char *addrs)
1586{
1587 char *cp, *ip, *dp;
1588 int num = 0;
1589
1590 ic_set_manually = 1;
1591 ic_enable = 1;
1592
1593
1594
1595
1596
1597 if (ic_proto_name(addrs))
1598 return 1;
1599
1600
1601 if (*addrs == 0 ||
1602 strcmp(addrs, "off") == 0 ||
1603 strcmp(addrs, "none") == 0) {
1604 ic_enable = 0;
1605 return 1;
1606 }
1607
1608 ic_nameservers_predef();
1609
1610
1611 ip = addrs;
1612 while (ip && *ip) {
1613 if ((cp = strchr(ip, ':')))
1614 *cp++ = '\0';
1615 if (strlen(ip) > 0) {
1616 DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip));
1617 switch (num) {
1618 case 0:
1619 if ((ic_myaddr = in_aton(ip)) == ANY)
1620 ic_myaddr = NONE;
1621 break;
1622 case 1:
1623 if ((ic_servaddr = in_aton(ip)) == ANY)
1624 ic_servaddr = NONE;
1625 break;
1626 case 2:
1627 if ((ic_gateway = in_aton(ip)) == ANY)
1628 ic_gateway = NONE;
1629 break;
1630 case 3:
1631 if ((ic_netmask = in_aton(ip)) == ANY)
1632 ic_netmask = NONE;
1633 break;
1634 case 4:
1635 if ((dp = strchr(ip, '.'))) {
1636 *dp++ = '\0';
1637 strlcpy(utsname()->domainname, dp,
1638 sizeof(utsname()->domainname));
1639 }
1640 strlcpy(utsname()->nodename, ip,
1641 sizeof(utsname()->nodename));
1642 ic_host_name_set = 1;
1643 break;
1644 case 5:
1645 strlcpy(user_dev_name, ip, sizeof(user_dev_name));
1646 break;
1647 case 6:
1648 if (ic_proto_name(ip) == 0 &&
1649 ic_myaddr == NONE) {
1650 ic_enable = 0;
1651 }
1652 break;
1653 case 7:
1654 if (CONF_NAMESERVERS_MAX >= 1) {
1655 ic_nameservers[0] = in_aton(ip);
1656 if (ic_nameservers[0] == ANY)
1657 ic_nameservers[0] = NONE;
1658 }
1659 break;
1660 case 8:
1661 if (CONF_NAMESERVERS_MAX >= 2) {
1662 ic_nameservers[1] = in_aton(ip);
1663 if (ic_nameservers[1] == ANY)
1664 ic_nameservers[1] = NONE;
1665 }
1666 break;
1667 }
1668 }
1669 ip = cp;
1670 num++;
1671 }
1672
1673 return 1;
1674}
1675__setup("ip=", ip_auto_config_setup);
1676
1677static int __init nfsaddrs_config_setup(char *addrs)
1678{
1679 return ip_auto_config_setup(addrs);
1680}
1681__setup("nfsaddrs=", nfsaddrs_config_setup);
1682
1683static int __init vendor_class_identifier_setup(char *addrs)
1684{
1685 if (strlcpy(vendor_class_identifier, addrs,
1686 sizeof(vendor_class_identifier))
1687 >= sizeof(vendor_class_identifier))
1688 pr_warn("DHCP: vendorclass too long, truncated to \"%s\"",
1689 vendor_class_identifier);
1690 return 1;
1691}
1692__setup("dhcpclass=", vendor_class_identifier_setup);
1693