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gro: Allow tunnel stacking in the case of FOU/GUE
[linux/fpc-iii.git] / net / ipv4 / ipconfig.c
blob8e7328c6a390a9bc064a67e4ca4263c891239378
1 /*
2 * Automatic Configuration of IP -- use DHCP, BOOTP, RARP, or
3 * user-supplied information to configure own IP address and routes.
4 *
5 * Copyright (C) 1996-1998 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
6 *
7 * Derived from network configuration code in fs/nfs/nfsroot.c,
8 * originally Copyright (C) 1995, 1996 Gero Kuhlmann and me.
9 *
10 * BOOTP rewritten to construct and analyse packets itself instead
11 * of misusing the IP layer. num_bugs_causing_wrong_arp_replies--;
12 * -- MJ, December 1998
13 *
14 * Fixed ip_auto_config_setup calling at startup in the new "Linker Magic"
15 * initialization scheme.
16 * - Arnaldo Carvalho de Melo <acme@conectiva.com.br>, 08/11/1999
17 *
18 * DHCP support added. To users this looks like a whole separate
19 * protocol, but we know it's just a bag on the side of BOOTP.
20 * -- Chip Salzenberg <chip@valinux.com>, May 2000
21 *
22 * Ported DHCP support from 2.2.16 to 2.4.0-test4
23 * -- Eric Biederman <ebiederman@lnxi.com>, 30 Aug 2000
24 *
25 * Merged changes from 2.2.19 into 2.4.3
26 * -- Eric Biederman <ebiederman@lnxi.com>, 22 April Aug 2001
27 *
28 * Multiple Nameservers in /proc/net/pnp
29 * -- Josef Siemes <jsiemes@web.de>, Aug 2002
30 */
31
32 #include <linux/types.h>
33 #include <linux/string.h>
34 #include <linux/kernel.h>
35 #include <linux/jiffies.h>
36 #include <linux/random.h>
37 #include <linux/init.h>
38 #include <linux/utsname.h>
39 #include <linux/in.h>
40 #include <linux/if.h>
41 #include <linux/inet.h>
42 #include <linux/inetdevice.h>
43 #include <linux/netdevice.h>
44 #include <linux/if_arp.h>
45 #include <linux/skbuff.h>
46 #include <linux/ip.h>
47 #include <linux/socket.h>
48 #include <linux/route.h>
49 #include <linux/udp.h>
50 #include <linux/proc_fs.h>
51 #include <linux/seq_file.h>
52 #include <linux/major.h>
53 #include <linux/root_dev.h>
54 #include <linux/delay.h>
55 #include <linux/nfs_fs.h>
56 #include <linux/slab.h>
57 #include <linux/export.h>
58 #include <net/net_namespace.h>
59 #include <net/arp.h>
60 #include <net/ip.h>
61 #include <net/ipconfig.h>
62 #include <net/route.h>
63
64 #include <asm/uaccess.h>
65 #include <net/checksum.h>
66 #include <asm/processor.h>
67
68 /* Define this to allow debugging output */
69 #undef IPCONFIG_DEBUG
70
71 #ifdef IPCONFIG_DEBUG
72 #define DBG(x) printk x
73 #else
74 #define DBG(x) do { } while(0)
75 #endif
76
77 #if defined(CONFIG_IP_PNP_DHCP)
78 #define IPCONFIG_DHCP
79 #endif
80 #if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_DHCP)
81 #define IPCONFIG_BOOTP
82 #endif
83 #if defined(CONFIG_IP_PNP_RARP)
84 #define IPCONFIG_RARP
85 #endif
86 #if defined(IPCONFIG_BOOTP) || defined(IPCONFIG_RARP)
87 #define IPCONFIG_DYNAMIC
88 #endif
89
90 /* Define the friendly delay before and after opening net devices */
91 #define CONF_POST_OPEN 10 /* After opening: 10 msecs */
92 #define CONF_CARRIER_TIMEOUT 120000 /* Wait for carrier timeout */
93
94 /* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */
95 #define CONF_OPEN_RETRIES 2 /* (Re)open devices twice */
96 #define CONF_SEND_RETRIES 6 /* Send six requests per open */
97 #define CONF_INTER_TIMEOUT (HZ/2) /* Inter-device timeout: 1/2 second */
98 #define CONF_BASE_TIMEOUT (HZ*2) /* Initial timeout: 2 seconds */
99 #define CONF_TIMEOUT_RANDOM (HZ) /* Maximum amount of randomization */
100 #define CONF_TIMEOUT_MULT *7/4 /* Rate of timeout growth */
101 #define CONF_TIMEOUT_MAX (HZ*30) /* Maximum allowed timeout */
102 #define CONF_NAMESERVERS_MAX 3 /* Maximum number of nameservers
103 - '3' from resolv.h */
104
105 #define NONE cpu_to_be32(INADDR_NONE)
106 #define ANY cpu_to_be32(INADDR_ANY)
107
108 /*
109 * Public IP configuration
110 */
111
112 /* This is used by platforms which might be able to set the ipconfig
113 * variables using firmware environment vars. If this is set, it will
114 * ignore such firmware variables.
115 */
116 int ic_set_manually __initdata = 0; /* IPconfig parameters set manually */
117
118 static int ic_enable __initdata; /* IP config enabled? */
119
120 /* Protocol choice */
121 int 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
133 static int ic_host_name_set __initdata; /* Host name set by us? */
134
135 __be32 ic_myaddr = NONE; /* My IP address */
136 static __be32 ic_netmask = NONE; /* Netmask for local subnet */
137 __be32 ic_gateway = NONE; /* Gateway IP address */
138
139 __be32 ic_addrservaddr = NONE; /* IP Address of the IP addresses'server */
140
141 __be32 ic_servaddr = NONE; /* Boot server IP address */
142
143 __be32 root_server_addr = NONE; /* Address of NFS server */
144 u8 root_server_path[256] = { 0, }; /* Path to mount as root */
145
146 /* vendor class identifier */
147 static char vendor_class_identifier[253] __initdata;
148
149 /* Persistent data: */
150
151 static int ic_proto_used; /* Protocol used, if any */
152 static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */
153 static u8 ic_domain[64]; /* DNS (not NIS) domain name */
154
155 /*
156 * Private state.
157 */
158
159 /* Name of user-selected boot device */
160 static char user_dev_name[IFNAMSIZ] __initdata = { 0, };
161
162 /* Protocols supported by available interfaces */
163 static int ic_proto_have_if __initdata;
164
165 /* MTU for boot device */
166 static int ic_dev_mtu __initdata;
167
168 #ifdef IPCONFIG_DYNAMIC
169 static DEFINE_SPINLOCK(ic_recv_lock);
170 static volatile int ic_got_reply __initdata; /* Proto(s) that replied */
171 #endif
172 #ifdef IPCONFIG_DHCP
173 static int ic_dhcp_msgtype __initdata; /* DHCP msg type received */
174 #endif
175
176
177 /*
178 * Network devices
179 */
180
181 struct ic_device {
182 struct ic_device *next;
183 struct net_device *dev;
184 unsigned short flags;
185 short able;
186 __be32 xid;
187 };
188
189 static struct ic_device *ic_first_dev __initdata; /* List of open device */
190 static struct net_device *ic_dev __initdata; /* Selected device */
191
192 static 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
202 static 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 /* bring loopback and DSA master network devices up first */
213 for_each_netdev(&init_net, dev) {
214 if (!(dev->flags & IFF_LOOPBACK) && !netdev_uses_dsa(dev))
215 continue;
216 if (dev_change_flags(dev, dev->flags | IFF_UP) < 0)
217 pr_err("IP-Config: Failed to open %s\n", dev->name);
218 }
219
220 for_each_netdev(&init_net, dev) {
221 if (ic_is_init_dev(dev)) {
222 int able = 0;
223 if (dev->mtu >= 364)
224 able |= IC_BOOTP;
225 else
226 pr_warn("DHCP/BOOTP: Ignoring device %s, MTU %d too small",
227 dev->name, dev->mtu);
228 if (!(dev->flags & IFF_NOARP))
229 able |= IC_RARP;
230 able &= ic_proto_enabled;
231 if (ic_proto_enabled && !able)
232 continue;
233 oflags = dev->flags;
234 if (dev_change_flags(dev, oflags | IFF_UP) < 0) {
235 pr_err("IP-Config: Failed to open %s\n",
236 dev->name);
237 continue;
238 }
239 if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) {
240 rtnl_unlock();
241 return -ENOMEM;
242 }
243 d->dev = dev;
244 *last = d;
245 last = &d->next;
246 d->flags = oflags;
247 d->able = able;
248 if (able & IC_BOOTP)
249 get_random_bytes(&d->xid, sizeof(__be32));
250 else
251 d->xid = 0;
252 ic_proto_have_if |= able;
253 DBG(("IP-Config: %s UP (able=%d, xid=%08x)\n",
254 dev->name, able, d->xid));
255 }
256 }
257
258 /* no point in waiting if we could not bring up at least one device */
259 if (!ic_first_dev)
260 goto have_carrier;
261
262 /* wait for a carrier on at least one device */
263 start = jiffies;
264 next_msg = start + msecs_to_jiffies(CONF_CARRIER_TIMEOUT/12);
265 while (time_before(jiffies, start +
266 msecs_to_jiffies(CONF_CARRIER_TIMEOUT))) {
267 int wait, elapsed;
268
269 for_each_netdev(&init_net, dev)
270 if (ic_is_init_dev(dev) && netif_carrier_ok(dev))
271 goto have_carrier;
272
273 msleep(1);
274
275 if (time_before(jiffies, next_msg))
276 continue;
277
278 elapsed = jiffies_to_msecs(jiffies - start);
279 wait = (CONF_CARRIER_TIMEOUT - elapsed + 500)/1000;
280 pr_info("Waiting up to %d more seconds for network.\n", wait);
281 next_msg = jiffies + msecs_to_jiffies(CONF_CARRIER_TIMEOUT/12);
282 }
283 have_carrier:
284 rtnl_unlock();
285
286 *last = NULL;
287
288 if (!ic_first_dev) {
289 if (user_dev_name[0])
290 pr_err("IP-Config: Device `%s' not found\n",
291 user_dev_name);
292 else
293 pr_err("IP-Config: No network devices available\n");
294 return -ENODEV;
295 }
296 return 0;
297 }
298
299 static void __init ic_close_devs(void)
300 {
301 struct ic_device *d, *next;
302 struct net_device *dev;
303
304 rtnl_lock();
305 next = ic_first_dev;
306 while ((d = next)) {
307 next = d->next;
308 dev = d->dev;
309 if (dev != ic_dev && !netdev_uses_dsa(dev)) {
310 DBG(("IP-Config: Downing %s\n", dev->name));
311 dev_change_flags(dev, d->flags);
312 }
313 kfree(d);
314 }
315 rtnl_unlock();
316 }
317
318 /*
319 * Interface to various network functions.
320 */
321
322 static inline void
323 set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port)
324 {
325 sin->sin_family = AF_INET;
326 sin->sin_addr.s_addr = addr;
327 sin->sin_port = port;
328 }
329
330 static int __init ic_devinet_ioctl(unsigned int cmd, struct ifreq *arg)
331 {
332 int res;
333
334 mm_segment_t oldfs = get_fs();
335 set_fs(get_ds());
336 res = devinet_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
337 set_fs(oldfs);
338 return res;
339 }
340
341 static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg)
342 {
343 int res;
344
345 mm_segment_t oldfs = get_fs();
346 set_fs(get_ds());
347 res = dev_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
348 set_fs(oldfs);
349 return res;
350 }
351
352 static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg)
353 {
354 int res;
355
356 mm_segment_t oldfs = get_fs();
357 set_fs(get_ds());
358 res = ip_rt_ioctl(&init_net, cmd, (void __user *) arg);
359 set_fs(oldfs);
360 return res;
361 }
362
363 /*
364 * Set up interface addresses and routes.
365 */
366
367 static int __init ic_setup_if(void)
368 {
369 struct ifreq ir;
370 struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr;
371 int err;
372
373 memset(&ir, 0, sizeof(ir));
374 strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name);
375 set_sockaddr(sin, ic_myaddr, 0);
376 if ((err = ic_devinet_ioctl(SIOCSIFADDR, &ir)) < 0) {
377 pr_err("IP-Config: Unable to set interface address (%d)\n",
378 err);
379 return -1;
380 }
381 set_sockaddr(sin, ic_netmask, 0);
382 if ((err = ic_devinet_ioctl(SIOCSIFNETMASK, &ir)) < 0) {
383 pr_err("IP-Config: Unable to set interface netmask (%d)\n",
384 err);
385 return -1;
386 }
387 set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0);
388 if ((err = ic_devinet_ioctl(SIOCSIFBRDADDR, &ir)) < 0) {
389 pr_err("IP-Config: Unable to set interface broadcast address (%d)\n",
390 err);
391 return -1;
392 }
393 /* Handle the case where we need non-standard MTU on the boot link (a network
394 * using jumbo frames, for instance). If we can't set the mtu, don't error
395 * out, we'll try to muddle along.
396 */
397 if (ic_dev_mtu != 0) {
398 strcpy(ir.ifr_name, ic_dev->name);
399 ir.ifr_mtu = ic_dev_mtu;
400 if ((err = ic_dev_ioctl(SIOCSIFMTU, &ir)) < 0)
401 pr_err("IP-Config: Unable to set interface mtu to %d (%d)\n",
402 ic_dev_mtu, err);
403 }
404 return 0;
405 }
406
407 static int __init ic_setup_routes(void)
408 {
409 /* No need to setup device routes, only the default route... */
410
411 if (ic_gateway != NONE) {
412 struct rtentry rm;
413 int err;
414
415 memset(&rm, 0, sizeof(rm));
416 if ((ic_gateway ^ ic_myaddr) & ic_netmask) {
417 pr_err("IP-Config: Gateway not on directly connected network\n");
418 return -1;
419 }
420 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0);
421 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0);
422 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0);
423 rm.rt_flags = RTF_UP | RTF_GATEWAY;
424 if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) {
425 pr_err("IP-Config: Cannot add default route (%d)\n",
426 err);
427 return -1;
428 }
429 }
430
431 return 0;
432 }
433
434 /*
435 * Fill in default values for all missing parameters.
436 */
437
438 static int __init ic_defaults(void)
439 {
440 /*
441 * At this point we have no userspace running so need not
442 * claim locks on system_utsname
443 */
444
445 if (!ic_host_name_set)
446 sprintf(init_utsname()->nodename, "%pI4", &ic_myaddr);
447
448 if (root_server_addr == NONE)
449 root_server_addr = ic_servaddr;
450
451 if (ic_netmask == NONE) {
452 if (IN_CLASSA(ntohl(ic_myaddr)))
453 ic_netmask = htonl(IN_CLASSA_NET);
454 else if (IN_CLASSB(ntohl(ic_myaddr)))
455 ic_netmask = htonl(IN_CLASSB_NET);
456 else if (IN_CLASSC(ntohl(ic_myaddr)))
457 ic_netmask = htonl(IN_CLASSC_NET);
458 else {
459 pr_err("IP-Config: Unable to guess netmask for address %pI4\n",
460 &ic_myaddr);
461 return -1;
462 }
463 printk("IP-Config: Guessing netmask %pI4\n", &ic_netmask);
464 }
465
466 return 0;
467 }
468
469 /*
470 * RARP support.
471 */
472
473 #ifdef IPCONFIG_RARP
474
475 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
476
477 static struct packet_type rarp_packet_type __initdata = {
478 .type = cpu_to_be16(ETH_P_RARP),
479 .func = ic_rarp_recv,
480 };
481
482 static inline void __init ic_rarp_init(void)
483 {
484 dev_add_pack(&rarp_packet_type);
485 }
486
487 static inline void __init ic_rarp_cleanup(void)
488 {
489 dev_remove_pack(&rarp_packet_type);
490 }
491
492 /*
493 * Process received RARP packet.
494 */
495 static int __init
496 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
497 {
498 struct arphdr *rarp;
499 unsigned char *rarp_ptr;
500 __be32 sip, tip;
501 unsigned char *tha; /* t for "target" */
502 struct ic_device *d;
503
504 if (!net_eq(dev_net(dev), &init_net))
505 goto drop;
506
507 skb = skb_share_check(skb, GFP_ATOMIC);
508 if (!skb)
509 return NET_RX_DROP;
510
511 if (!pskb_may_pull(skb, sizeof(struct arphdr)))
512 goto drop;
513
514 /* Basic sanity checks can be done without the lock. */
515 rarp = (struct arphdr *)skb_transport_header(skb);
516
517 /* If this test doesn't pass, it's not IP, or we should
518 * ignore it anyway.
519 */
520 if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd))
521 goto drop;
522
523 /* If it's not a RARP reply, delete it. */
524 if (rarp->ar_op != htons(ARPOP_RREPLY))
525 goto drop;
526
527 /* If it's not Ethernet, delete it. */
528 if (rarp->ar_pro != htons(ETH_P_IP))
529 goto drop;
530
531 if (!pskb_may_pull(skb, arp_hdr_len(dev)))
532 goto drop;
533
534 /* OK, it is all there and looks valid, process... */
535 rarp = (struct arphdr *)skb_transport_header(skb);
536 rarp_ptr = (unsigned char *) (rarp + 1);
537
538 /* One reply at a time, please. */
539 spin_lock(&ic_recv_lock);
540
541 /* If we already have a reply, just drop the packet */
542 if (ic_got_reply)
543 goto drop_unlock;
544
545 /* Find the ic_device that the packet arrived on */
546 d = ic_first_dev;
547 while (d && d->dev != dev)
548 d = d->next;
549 if (!d)
550 goto drop_unlock; /* should never happen */
551
552 /* Extract variable-width fields */
553 rarp_ptr += dev->addr_len;
554 memcpy(&sip, rarp_ptr, 4);
555 rarp_ptr += 4;
556 tha = rarp_ptr;
557 rarp_ptr += dev->addr_len;
558 memcpy(&tip, rarp_ptr, 4);
559
560 /* Discard packets which are not meant for us. */
561 if (memcmp(tha, dev->dev_addr, dev->addr_len))
562 goto drop_unlock;
563
564 /* Discard packets which are not from specified server. */
565 if (ic_servaddr != NONE && ic_servaddr != sip)
566 goto drop_unlock;
567
568 /* We have a winner! */
569 ic_dev = dev;
570 if (ic_myaddr == NONE)
571 ic_myaddr = tip;
572 ic_servaddr = sip;
573 ic_addrservaddr = sip;
574 ic_got_reply = IC_RARP;
575
576 drop_unlock:
577 /* Show's over. Nothing to see here. */
578 spin_unlock(&ic_recv_lock);
579
580 drop:
581 /* Throw the packet out. */
582 kfree_skb(skb);
583 return 0;
584 }
585
586
587 /*
588 * Send RARP request packet over a single interface.
589 */
590 static void __init ic_rarp_send_if(struct ic_device *d)
591 {
592 struct net_device *dev = d->dev;
593 arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL,
594 dev->dev_addr, dev->dev_addr);
595 }
596 #endif
597
598 /*
599 * Predefine Nameservers
600 */
601 static inline void __init ic_nameservers_predef(void)
602 {
603 int i;
604
605 for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
606 ic_nameservers[i] = NONE;
607 }
608
609 /*
610 * DHCP/BOOTP support.
611 */
612
613 #ifdef IPCONFIG_BOOTP
614
615 struct bootp_pkt { /* BOOTP packet format */
616 struct iphdr iph; /* IP header */
617 struct udphdr udph; /* UDP header */
618 u8 op; /* 1=request, 2=reply */
619 u8 htype; /* HW address type */
620 u8 hlen; /* HW address length */
621 u8 hops; /* Used only by gateways */
622 __be32 xid; /* Transaction ID */
623 __be16 secs; /* Seconds since we started */
624 __be16 flags; /* Just what it says */
625 __be32 client_ip; /* Client's IP address if known */
626 __be32 your_ip; /* Assigned IP address */
627 __be32 server_ip; /* (Next, e.g. NFS) Server's IP address */
628 __be32 relay_ip; /* IP address of BOOTP relay */
629 u8 hw_addr[16]; /* Client's HW address */
630 u8 serv_name[64]; /* Server host name */
631 u8 boot_file[128]; /* Name of boot file */
632 u8 exten[312]; /* DHCP options / BOOTP vendor extensions */
633 };
634
635 /* packet ops */
636 #define BOOTP_REQUEST 1
637 #define BOOTP_REPLY 2
638
639 /* DHCP message types */
640 #define DHCPDISCOVER 1
641 #define DHCPOFFER 2
642 #define DHCPREQUEST 3
643 #define DHCPDECLINE 4
644 #define DHCPACK 5
645 #define DHCPNAK 6
646 #define DHCPRELEASE 7
647 #define DHCPINFORM 8
648
649 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
650
651 static struct packet_type bootp_packet_type __initdata = {
652 .type = cpu_to_be16(ETH_P_IP),
653 .func = ic_bootp_recv,
654 };
655
656 static __be32 ic_dev_xid; /* Device under configuration */
657
658 /*
659 * Initialize DHCP/BOOTP extension fields in the request.
660 */
661
662 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 };
663
664 #ifdef IPCONFIG_DHCP
665
666 static void __init
667 ic_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); /* RFC1048 Magic Cookie */
679 e += 4;
680
681 *e++ = 53; /* DHCP message type */
682 *e++ = 1;
683 *e++ = mt;
684
685 if (mt == DHCPREQUEST) {
686 *e++ = 54; /* Server ID (IP address) */
687 *e++ = 4;
688 memcpy(e, &ic_servaddr, 4);
689 e += 4;
690
691 *e++ = 50; /* Requested IP address */
692 *e++ = 4;
693 memcpy(e, &ic_myaddr, 4);
694 e += 4;
695 }
696
697 /* always? */
698 {
699 static const u8 ic_req_params[] = {
700 1, /* Subnet mask */
701 3, /* Default gateway */
702 6, /* DNS server */
703 12, /* Host name */
704 15, /* Domain name */
705 17, /* Boot path */
706 26, /* MTU */
707 40, /* NIS domain name */
708 };
709
710 *e++ = 55; /* Parameter request list */
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; /* host-name */
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; /* Class-identifier */
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; /* End of the list */
734 }
735
736 #endif /* IPCONFIG_DHCP */
737
738 static void __init ic_bootp_init_ext(u8 *e)
739 {
740 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */
741 e += 4;
742 *e++ = 1; /* Subnet mask request */
743 *e++ = 4;
744 e += 4;
745 *e++ = 3; /* Default gateway request */
746 *e++ = 4;
747 e += 4;
748 *e++ = 5; /* Name server request */
749 *e++ = 8;
750 e += 8;
751 *e++ = 12; /* Host name request */
752 *e++ = 32;
753 e += 32;
754 *e++ = 40; /* NIS Domain name request */
755 *e++ = 32;
756 e += 32;
757 *e++ = 17; /* Boot path */
758 *e++ = 40;
759 e += 40;
760
761 *e++ = 57; /* set extension buffer size for reply */
762 *e++ = 2;
763 *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */
764 *e++ = 150;
765
766 *e++ = 255; /* End of the list */
767 }
768
769
770 /*
771 * Initialize the DHCP/BOOTP mechanism.
772 */
773 static 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 * DHCP/BOOTP cleanup.
783 */
784 static inline void __init ic_bootp_cleanup(void)
785 {
786 dev_remove_pack(&bootp_packet_type);
787 }
788
789
790 /*
791 * Send DHCP/BOOTP request to single interface.
792 */
793 static 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 /* Allocate packet */
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 /* Construct IP header */
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 /* Construct UDP header */
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 /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */
828
829 /* Construct DHCP/BOOTP header */
830 b->op = BOOTP_REQUEST;
831 if (dev->type < 256) /* check for false types */
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; /* can cause undefined behavior */
838 }
839
840 /* server_ip and your_ip address are both already zero per RFC2131 */
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 /* add DHCP options or BOOTP extensions */
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 /* Chain packet down the line... */
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 * Copy BOOTP-supplied string if not already set.
871 */
872 static 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 * Process BOOTP extensions.
886 */
887 static 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: /* Subnet mask */
904 if (ic_netmask == NONE)
905 memcpy(&ic_netmask, ext+1, 4);
906 break;
907 case 3: /* Default gateway */
908 if (ic_gateway == NONE)
909 memcpy(&ic_gateway, ext+1, 4);
910 break;
911 case 6: /* DNS server */
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: /* Host name */
921 ic_bootp_string(utsname()->nodename, ext+1, *ext,
922 __NEW_UTS_LEN);
923 ic_host_name_set = 1;
924 break;
925 case 15: /* Domain name (DNS) */
926 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
927 break;
928 case 17: /* Root path */
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: /* Interface MTU */
934 memcpy(&mtu, ext+1, sizeof(mtu));
935 ic_dev_mtu = ntohs(mtu);
936 break;
937 case 40: /* NIS Domain name (_not_ DNS) */
938 ic_bootp_string(utsname()->domainname, ext+1, *ext,
939 __NEW_UTS_LEN);
940 break;
941 }
942 }
943
944
945 /*
946 * Receive BOOTP reply.
947 */
948 static 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 /* Perform verifications before taking the lock. */
959 if (skb->pkt_type == PACKET_OTHERHOST)
960 goto drop;
961
962 skb = skb_share_check(skb, GFP_ATOMIC);
963 if (!skb)
964 return NET_RX_DROP;
965
966 if (!pskb_may_pull(skb,
967 sizeof(struct iphdr) +
968 sizeof(struct udphdr)))
969 goto drop;
970
971 b = (struct bootp_pkt *)skb_network_header(skb);
972 h = &b->iph;
973
974 if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP)
975 goto drop;
976
977 /* Fragments are not supported */
978 if (ip_is_fragment(h)) {
979 net_err_ratelimited("DHCP/BOOTP: Ignoring fragmented reply\n");
980 goto drop;
981 }
982
983 if (skb->len < ntohs(h->tot_len))
984 goto drop;
985
986 if (ip_fast_csum((char *) h, h->ihl))
987 goto drop;
988
989 if (b->udph.source != htons(67) || b->udph.dest != htons(68))
990 goto drop;
991
992 if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
993 goto drop;
994
995 len = ntohs(b->udph.len) - sizeof(struct udphdr);
996 ext_len = len - (sizeof(*b) -
997 sizeof(struct iphdr) -
998 sizeof(struct udphdr) -
999 sizeof(b->exten));
1000 if (ext_len < 0)
1001 goto drop;
1002
1003 /* Ok the front looks good, make sure we can get at the rest. */
1004 if (!pskb_may_pull(skb, skb->len))
1005 goto drop;
1006
1007 b = (struct bootp_pkt *)skb_network_header(skb);
1008 h = &b->iph;
1009
1010 /* One reply at a time, please. */
1011 spin_lock(&ic_recv_lock);
1012
1013 /* If we already have a reply, just drop the packet */
1014 if (ic_got_reply)
1015 goto drop_unlock;
1016
1017 /* Find the ic_device that the packet arrived on */
1018 d = ic_first_dev;
1019 while (d && d->dev != dev)
1020 d = d->next;
1021 if (!d)
1022 goto drop_unlock; /* should never happen */
1023
1024 /* Is it a reply to our BOOTP request? */
1025 if (b->op != BOOTP_REPLY ||
1026 b->xid != d->xid) {
1027 net_err_ratelimited("DHCP/BOOTP: Reply not for us, op[%x] xid[%x]\n",
1028 b->op, b->xid);
1029 goto drop_unlock;
1030 }
1031
1032 /* Is it a reply for the device we are configuring? */
1033 if (b->xid != ic_dev_xid) {
1034 net_err_ratelimited("DHCP/BOOTP: Ignoring delayed packet\n");
1035 goto drop_unlock;
1036 }
1037
1038 /* Parse extensions */
1039 if (ext_len >= 4 &&
1040 !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */
1041 u8 *end = (u8 *) b + ntohs(b->iph.tot_len);
1042 u8 *ext;
1043
1044 #ifdef IPCONFIG_DHCP
1045 if (ic_proto_enabled & IC_USE_DHCP) {
1046 __be32 server_id = NONE;
1047 int mt = 0;
1048
1049 ext = &b->exten[4];
1050 while (ext < end && *ext != 0xff) {
1051 u8 *opt = ext++;
1052 if (*opt == 0) /* Padding */
1053 continue;
1054 ext += *ext + 1;
1055 if (ext >= end)
1056 break;
1057 switch (*opt) {
1058 case 53: /* Message type */
1059 if (opt[1])
1060 mt = opt[2];
1061 break;
1062 case 54: /* Server ID (IP address) */
1063 if (opt[1] >= 4)
1064 memcpy(&server_id, opt + 2, 4);
1065 break;
1066 }
1067 }
1068
1069 #ifdef IPCONFIG_DEBUG
1070 printk("DHCP: Got message type %d\n", mt);
1071 #endif
1072
1073 switch (mt) {
1074 case DHCPOFFER:
1075 /* While in the process of accepting one offer,
1076 * ignore all others.
1077 */
1078 if (ic_myaddr != NONE)
1079 goto drop_unlock;
1080
1081 /* Let's accept that offer. */
1082 ic_myaddr = b->your_ip;
1083 ic_servaddr = server_id;
1084 #ifdef IPCONFIG_DEBUG
1085 printk("DHCP: Offered address %pI4 by server %pI4\n",
1086 &ic_myaddr, &b->iph.saddr);
1087 #endif
1088 /* The DHCP indicated server address takes
1089 * precedence over the bootp header one if
1090 * they are different.
1091 */
1092 if ((server_id != NONE) &&
1093 (b->server_ip != server_id))
1094 b->server_ip = ic_servaddr;
1095 break;
1096
1097 case DHCPACK:
1098 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0)
1099 goto drop_unlock;
1100
1101 /* Yeah! */
1102 break;
1103
1104 default:
1105 /* Urque. Forget it*/
1106 ic_myaddr = NONE;
1107 ic_servaddr = NONE;
1108 goto drop_unlock;
1109 }
1110
1111 ic_dhcp_msgtype = mt;
1112
1113 }
1114 #endif /* IPCONFIG_DHCP */
1115
1116 ext = &b->exten[4];
1117 while (ext < end && *ext != 0xff) {
1118 u8 *opt = ext++;
1119 if (*opt == 0) /* Padding */
1120 continue;
1121 ext += *ext + 1;
1122 if (ext < end)
1123 ic_do_bootp_ext(opt);
1124 }
1125 }
1126
1127 /* We have a winner! */
1128 ic_dev = dev;
1129 ic_myaddr = b->your_ip;
1130 ic_servaddr = b->server_ip;
1131 ic_addrservaddr = b->iph.saddr;
1132 if (ic_gateway == NONE && b->relay_ip)
1133 ic_gateway = b->relay_ip;
1134 if (ic_nameservers[0] == NONE)
1135 ic_nameservers[0] = ic_servaddr;
1136 ic_got_reply = IC_BOOTP;
1137
1138 drop_unlock:
1139 /* Show's over. Nothing to see here. */
1140 spin_unlock(&ic_recv_lock);
1141
1142 drop:
1143 /* Throw the packet out. */
1144 kfree_skb(skb);
1145
1146 return 0;
1147 }
1148
1149
1150 #endif
1151
1152
1153 /*
1154 * Dynamic IP configuration -- DHCP, BOOTP, RARP.
1155 */
1156
1157 #ifdef IPCONFIG_DYNAMIC
1158
1159 static int __init ic_dynamic(void)
1160 {
1161 int retries;
1162 struct ic_device *d;
1163 unsigned long start_jiffies, timeout, jiff;
1164 int do_bootp = ic_proto_have_if & IC_BOOTP;
1165 int do_rarp = ic_proto_have_if & IC_RARP;
1166
1167 /*
1168 * If none of DHCP/BOOTP/RARP was selected, return with an error.
1169 * This routine gets only called when some pieces of information
1170 * are missing, and without DHCP/BOOTP/RARP we are unable to get it.
1171 */
1172 if (!ic_proto_enabled) {
1173 pr_err("IP-Config: Incomplete network configuration information\n");
1174 return -1;
1175 }
1176
1177 #ifdef IPCONFIG_BOOTP
1178 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
1179 pr_err("DHCP/BOOTP: No suitable device found\n");
1180 #endif
1181 #ifdef IPCONFIG_RARP
1182 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)
1183 pr_err("RARP: No suitable device found\n");
1184 #endif
1185
1186 if (!ic_proto_have_if)
1187 /* Error message already printed */
1188 return -1;
1189
1190 /*
1191 * Setup protocols
1192 */
1193 #ifdef IPCONFIG_BOOTP
1194 if (do_bootp)
1195 ic_bootp_init();
1196 #endif
1197 #ifdef IPCONFIG_RARP
1198 if (do_rarp)
1199 ic_rarp_init();
1200 #endif
1201
1202 /*
1203 * Send requests and wait, until we get an answer. This loop
1204 * seems to be a terrible waste of CPU time, but actually there is
1205 * only one process running at all, so we don't need to use any
1206 * scheduler functions.
1207 * [Actually we could now, but the nothing else running note still
1208 * applies.. - AC]
1209 */
1210 pr_notice("Sending %s%s%s requests .",
1211 do_bootp
1212 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "",
1213 (do_bootp && do_rarp) ? " and " : "",
1214 do_rarp ? "RARP" : "");
1215
1216 start_jiffies = jiffies;
1217 d = ic_first_dev;
1218 retries = CONF_SEND_RETRIES;
1219 get_random_bytes(&timeout, sizeof(timeout));
1220 timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned int) CONF_TIMEOUT_RANDOM);
1221 for (;;) {
1222 #ifdef IPCONFIG_BOOTP
1223 /* Track the device we are configuring */
1224 ic_dev_xid = d->xid;
1225
1226 if (do_bootp && (d->able & IC_BOOTP))
1227 ic_bootp_send_if(d, jiffies - start_jiffies);
1228 #endif
1229 #ifdef IPCONFIG_RARP
1230 if (do_rarp && (d->able & IC_RARP))
1231 ic_rarp_send_if(d);
1232 #endif
1233
1234 jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout);
1235 while (time_before(jiffies, jiff) && !ic_got_reply)
1236 schedule_timeout_uninterruptible(1);
1237 #ifdef IPCONFIG_DHCP
1238 /* DHCP isn't done until we get a DHCPACK. */
1239 if ((ic_got_reply & IC_BOOTP) &&
1240 (ic_proto_enabled & IC_USE_DHCP) &&
1241 ic_dhcp_msgtype != DHCPACK) {
1242 ic_got_reply = 0;
1243 pr_cont(",");
1244 continue;
1245 }
1246 #endif /* IPCONFIG_DHCP */
1247
1248 if (ic_got_reply) {
1249 pr_cont(" OK\n");
1250 break;
1251 }
1252
1253 if ((d = d->next))
1254 continue;
1255
1256 if (! --retries) {
1257 pr_cont(" timed out!\n");
1258 break;
1259 }
1260
1261 d = ic_first_dev;
1262
1263 timeout = timeout CONF_TIMEOUT_MULT;
1264 if (timeout > CONF_TIMEOUT_MAX)
1265 timeout = CONF_TIMEOUT_MAX;
1266
1267 pr_cont(".");
1268 }
1269
1270 #ifdef IPCONFIG_BOOTP
1271 if (do_bootp)
1272 ic_bootp_cleanup();
1273 #endif
1274 #ifdef IPCONFIG_RARP
1275 if (do_rarp)
1276 ic_rarp_cleanup();
1277 #endif
1278
1279 if (!ic_got_reply) {
1280 ic_myaddr = NONE;
1281 return -1;
1282 }
1283
1284 printk("IP-Config: Got %s answer from %pI4, ",
1285 ((ic_got_reply & IC_RARP) ? "RARP"
1286 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),
1287 &ic_addrservaddr);
1288 pr_cont("my address is %pI4\n", &ic_myaddr);
1289
1290 return 0;
1291 }
1292
1293 #endif /* IPCONFIG_DYNAMIC */
1294
1295 #ifdef CONFIG_PROC_FS
1296
1297 static int pnp_seq_show(struct seq_file *seq, void *v)
1298 {
1299 int i;
1300
1301 if (ic_proto_used & IC_PROTO)
1302 seq_printf(seq, "#PROTO: %s\n",
1303 (ic_proto_used & IC_RARP) ? "RARP"
1304 : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP");
1305 else
1306 seq_puts(seq, "#MANUAL\n");
1307
1308 if (ic_domain[0])
1309 seq_printf(seq,
1310 "domain %s\n", ic_domain);
1311 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {
1312 if (ic_nameservers[i] != NONE)
1313 seq_printf(seq, "nameserver %pI4\n",
1314 &ic_nameservers[i]);
1315 }
1316 if (ic_servaddr != NONE)
1317 seq_printf(seq, "bootserver %pI4\n",
1318 &ic_servaddr);
1319 return 0;
1320 }
1321
1322 static int pnp_seq_open(struct inode *indoe, struct file *file)
1323 {
1324 return single_open(file, pnp_seq_show, NULL);
1325 }
1326
1327 static const struct file_operations pnp_seq_fops = {
1328 .owner = THIS_MODULE,
1329 .open = pnp_seq_open,
1330 .read = seq_read,
1331 .llseek = seq_lseek,
1332 .release = single_release,
1333 };
1334 #endif /* CONFIG_PROC_FS */
1335
1336 /*
1337 * Extract IP address from the parameter string if needed. Note that we
1338 * need to have root_server_addr set _before_ IPConfig gets called as it
1339 * can override it.
1340 */
1341 __be32 __init root_nfs_parse_addr(char *name)
1342 {
1343 __be32 addr;
1344 int octets = 0;
1345 char *cp, *cq;
1346
1347 cp = cq = name;
1348 while (octets < 4) {
1349 while (*cp >= '0' && *cp <= '9')
1350 cp++;
1351 if (cp == cq || cp - cq > 3)
1352 break;
1353 if (*cp == '.' || octets == 3)
1354 octets++;
1355 if (octets < 4)
1356 cp++;
1357 cq = cp;
1358 }
1359 if (octets == 4 && (*cp == ':' || *cp == '\0')) {
1360 if (*cp == ':')
1361 *cp++ = '\0';
1362 addr = in_aton(name);
1363 memmove(name, cp, strlen(cp) + 1);
1364 } else
1365 addr = NONE;
1366
1367 return addr;
1368 }
1369
1370 #define DEVICE_WAIT_MAX 12 /* 12 seconds */
1371
1372 static int __init wait_for_devices(void)
1373 {
1374 int i;
1375
1376 for (i = 0; i < DEVICE_WAIT_MAX; i++) {
1377 struct net_device *dev;
1378 int found = 0;
1379
1380 rtnl_lock();
1381 for_each_netdev(&init_net, dev) {
1382 if (ic_is_init_dev(dev)) {
1383 found = 1;
1384 break;
1385 }
1386 }
1387 rtnl_unlock();
1388 if (found)
1389 return 0;
1390 ssleep(1);
1391 }
1392 return -ENODEV;
1393 }
1394
1395 /*
1396 * IP Autoconfig dispatcher.
1397 */
1398
1399 static int __init ip_auto_config(void)
1400 {
1401 __be32 addr;
1402 #ifdef IPCONFIG_DYNAMIC
1403 int retries = CONF_OPEN_RETRIES;
1404 #endif
1405 int err;
1406 unsigned int i;
1407
1408 #ifdef CONFIG_PROC_FS
1409 proc_create("pnp", S_IRUGO, init_net.proc_net, &pnp_seq_fops);
1410 #endif /* CONFIG_PROC_FS */
1411
1412 if (!ic_enable)
1413 return 0;
1414
1415 DBG(("IP-Config: Entered.\n"));
1416 #ifdef IPCONFIG_DYNAMIC
1417 try_try_again:
1418 #endif
1419 /* Wait for devices to appear */
1420 err = wait_for_devices();
1421 if (err)
1422 return err;
1423
1424 /* Setup all network devices */
1425 err = ic_open_devs();
1426 if (err)
1427 return err;
1428
1429 /* Give drivers a chance to settle */
1430 msleep(CONF_POST_OPEN);
1431
1432 /*
1433 * If the config information is insufficient (e.g., our IP address or
1434 * IP address of the boot server is missing or we have multiple network
1435 * interfaces and no default was set), use BOOTP or RARP to get the
1436 * missing values.
1437 */
1438 if (ic_myaddr == NONE ||
1439 #ifdef CONFIG_ROOT_NFS
1440 (root_server_addr == NONE &&
1441 ic_servaddr == NONE &&
1442 ROOT_DEV == Root_NFS) ||
1443 #endif
1444 ic_first_dev->next) {
1445 #ifdef IPCONFIG_DYNAMIC
1446 if (ic_dynamic() < 0) {
1447 ic_close_devs();
1448
1449 /*
1450 * I don't know why, but sometimes the
1451 * eepro100 driver (at least) gets upset and
1452 * doesn't work the first time it's opened.
1453 * But then if you close it and reopen it, it
1454 * works just fine. So we need to try that at
1455 * least once before giving up.
1456 *
1457 * Also, if the root will be NFS-mounted, we
1458 * have nowhere to go if DHCP fails. So we
1459 * just have to keep trying forever.
1460 *
1461 * -- Chip
1462 */
1463 #ifdef CONFIG_ROOT_NFS
1464 if (ROOT_DEV == Root_NFS) {
1465 pr_err("IP-Config: Retrying forever (NFS root)...\n");
1466 goto try_try_again;
1467 }
1468 #endif
1469
1470 if (--retries) {
1471 pr_err("IP-Config: Reopening network devices...\n");
1472 goto try_try_again;
1473 }
1474
1475 /* Oh, well. At least we tried. */
1476 pr_err("IP-Config: Auto-configuration of network failed\n");
1477 return -1;
1478 }
1479 #else /* !DYNAMIC */
1480 pr_err("IP-Config: Incomplete network configuration information\n");
1481 ic_close_devs();
1482 return -1;
1483 #endif /* IPCONFIG_DYNAMIC */
1484 } else {
1485 /* Device selected manually or only one device -> use it */
1486 ic_dev = ic_first_dev->dev;
1487 }
1488
1489 addr = root_nfs_parse_addr(root_server_path);
1490 if (root_server_addr == NONE)
1491 root_server_addr = addr;
1492
1493 /*
1494 * Use defaults wherever applicable.
1495 */
1496 if (ic_defaults() < 0)
1497 return -1;
1498
1499 /*
1500 * Close all network devices except the device we've
1501 * autoconfigured and set up routes.
1502 */
1503 ic_close_devs();
1504 if (ic_setup_if() < 0 || ic_setup_routes() < 0)
1505 return -1;
1506
1507 /*
1508 * Record which protocol was actually used.
1509 */
1510 #ifdef IPCONFIG_DYNAMIC
1511 ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP);
1512 #endif
1513
1514 #ifndef IPCONFIG_SILENT
1515 /*
1516 * Clue in the operator.
1517 */
1518 pr_info("IP-Config: Complete:\n");
1519
1520 pr_info(" device=%s, hwaddr=%*phC, ipaddr=%pI4, mask=%pI4, gw=%pI4\n",
1521 ic_dev->name, ic_dev->addr_len, ic_dev->dev_addr,
1522 &ic_myaddr, &ic_netmask, &ic_gateway);
1523 pr_info(" host=%s, domain=%s, nis-domain=%s\n",
1524 utsname()->nodename, ic_domain, utsname()->domainname);
1525 pr_info(" bootserver=%pI4, rootserver=%pI4, rootpath=%s",
1526 &ic_servaddr, &root_server_addr, root_server_path);
1527 if (ic_dev_mtu)
1528 pr_cont(", mtu=%d", ic_dev_mtu);
1529 for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
1530 if (ic_nameservers[i] != NONE) {
1531 pr_info(" nameserver%u=%pI4",
1532 i, &ic_nameservers[i]);
1533 break;
1534 }
1535 for (i++; i < CONF_NAMESERVERS_MAX; i++)
1536 if (ic_nameservers[i] != NONE)
1537 pr_cont(", nameserver%u=%pI4", i, &ic_nameservers[i]);
1538 pr_cont("\n");
1539 #endif /* !SILENT */
1540
1541 return 0;
1542 }
1543
1544 late_initcall(ip_auto_config);
1545
1546
1547 /*
1548 * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
1549 * command line parameter. See Documentation/filesystems/nfs/nfsroot.txt.
1550 */
1551 static int __init ic_proto_name(char *name)
1552 {
1553 if (!strcmp(name, "on") || !strcmp(name, "any")) {
1554 return 1;
1555 }
1556 if (!strcmp(name, "off") || !strcmp(name, "none")) {
1557 return 0;
1558 }
1559 #ifdef CONFIG_IP_PNP_DHCP
1560 else if (!strcmp(name, "dhcp")) {
1561 ic_proto_enabled &= ~IC_RARP;
1562 return 1;
1563 }
1564 #endif
1565 #ifdef CONFIG_IP_PNP_BOOTP
1566 else if (!strcmp(name, "bootp")) {
1567 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP);
1568 return 1;
1569 }
1570 #endif
1571 #ifdef CONFIG_IP_PNP_RARP
1572 else if (!strcmp(name, "rarp")) {
1573 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP);
1574 return 1;
1575 }
1576 #endif
1577 #ifdef IPCONFIG_DYNAMIC
1578 else if (!strcmp(name, "both")) {
1579 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */
1580 return 1;
1581 }
1582 #endif
1583 return 0;
1584 }
1585
1586 static int __init ip_auto_config_setup(char *addrs)
1587 {
1588 char *cp, *ip, *dp;
1589 int num = 0;
1590
1591 ic_set_manually = 1;
1592 ic_enable = 1;
1593
1594 /*
1595 * If any dhcp, bootp etc options are set, leave autoconfig on
1596 * and skip the below static IP processing.
1597 */
1598 if (ic_proto_name(addrs))
1599 return 1;
1600
1601 /* If no static IP is given, turn off autoconfig and bail. */
1602 if (*addrs == 0 ||
1603 strcmp(addrs, "off") == 0 ||
1604 strcmp(addrs, "none") == 0) {
1605 ic_enable = 0;
1606 return 1;
1607 }
1608
1609 ic_nameservers_predef();
1610
1611 /* Parse string for static IP assignment. */
1612 ip = addrs;
1613 while (ip && *ip) {
1614 if ((cp = strchr(ip, ':')))
1615 *cp++ = '\0';
1616 if (strlen(ip) > 0) {
1617 DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip));
1618 switch (num) {
1619 case 0:
1620 if ((ic_myaddr = in_aton(ip)) == ANY)
1621 ic_myaddr = NONE;
1622 break;
1623 case 1:
1624 if ((ic_servaddr = in_aton(ip)) == ANY)
1625 ic_servaddr = NONE;
1626 break;
1627 case 2:
1628 if ((ic_gateway = in_aton(ip)) == ANY)
1629 ic_gateway = NONE;
1630 break;
1631 case 3:
1632 if ((ic_netmask = in_aton(ip)) == ANY)
1633 ic_netmask = NONE;
1634 break;
1635 case 4:
1636 if ((dp = strchr(ip, '.'))) {
1637 *dp++ = '\0';
1638 strlcpy(utsname()->domainname, dp,
1639 sizeof(utsname()->domainname));
1640 }
1641 strlcpy(utsname()->nodename, ip,
1642 sizeof(utsname()->nodename));
1643 ic_host_name_set = 1;
1644 break;
1645 case 5:
1646 strlcpy(user_dev_name, ip, sizeof(user_dev_name));
1647 break;
1648 case 6:
1649 if (ic_proto_name(ip) == 0 &&
1650 ic_myaddr == NONE) {
1651 ic_enable = 0;
1652 }
1653 break;
1654 case 7:
1655 if (CONF_NAMESERVERS_MAX >= 1) {
1656 ic_nameservers[0] = in_aton(ip);
1657 if (ic_nameservers[0] == ANY)
1658 ic_nameservers[0] = NONE;
1659 }
1660 break;
1661 case 8:
1662 if (CONF_NAMESERVERS_MAX >= 2) {
1663 ic_nameservers[1] = in_aton(ip);
1664 if (ic_nameservers[1] == ANY)
1665 ic_nameservers[1] = NONE;
1666 }
1667 break;
1668 }
1669 }
1670 ip = cp;
1671 num++;
1672 }
1673
1674 return 1;
1675 }
1676 __setup("ip=", ip_auto_config_setup);
1677
1678 static int __init nfsaddrs_config_setup(char *addrs)
1679 {
1680 return ip_auto_config_setup(addrs);
1681 }
1682 __setup("nfsaddrs=", nfsaddrs_config_setup);
1683
1684 static int __init vendor_class_identifier_setup(char *addrs)
1685 {
1686 if (strlcpy(vendor_class_identifier, addrs,
1687 sizeof(vendor_class_identifier))
1688 >= sizeof(vendor_class_identifier))
1689 pr_warn("DHCP: vendorclass too long, truncated to \"%s\"",
1690 vendor_class_identifier);
1691 return 1;
1692 }
1693 __setup("dhcpclass=", vendor_class_identifier_setup);
Linux with added FPC-III support