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power: supply: sbs-battery: simplify DT parsing
[deliverable/linux.git] / net / ipv4 / ipconfig.c
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 #if defined(CONFIG_IP_PNP_DHCP)
69 #define IPCONFIG_DHCP
70 #endif
71 #if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_DHCP)
72 #define IPCONFIG_BOOTP
73 #endif
74 #if defined(CONFIG_IP_PNP_RARP)
75 #define IPCONFIG_RARP
76 #endif
77 #if defined(IPCONFIG_BOOTP) || defined(IPCONFIG_RARP)
78 #define IPCONFIG_DYNAMIC
79 #endif
80
81 /* Define the friendly delay before and after opening net devices */
82 #define CONF_POST_OPEN 10 /* After opening: 10 msecs */
83 #define CONF_CARRIER_TIMEOUT 120000 /* Wait for carrier timeout */
84
85 /* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */
86 #define CONF_OPEN_RETRIES 2 /* (Re)open devices twice */
87 #define CONF_SEND_RETRIES 6 /* Send six requests per open */
88 #define CONF_INTER_TIMEOUT (HZ) /* Inter-device timeout: 1 second */
89 #define CONF_BASE_TIMEOUT (HZ*2) /* Initial timeout: 2 seconds */
90 #define CONF_TIMEOUT_RANDOM (HZ) /* Maximum amount of randomization */
91 #define CONF_TIMEOUT_MULT *7/4 /* Rate of timeout growth */
92 #define CONF_TIMEOUT_MAX (HZ*30) /* Maximum allowed timeout */
93 #define CONF_NAMESERVERS_MAX 3 /* Maximum number of nameservers
94 - '3' from resolv.h */
95
96 #define NONE cpu_to_be32(INADDR_NONE)
97 #define ANY cpu_to_be32(INADDR_ANY)
98
99 /*
100 * Public IP configuration
101 */
102
103 /* This is used by platforms which might be able to set the ipconfig
104 * variables using firmware environment vars. If this is set, it will
105 * ignore such firmware variables.
106 */
107 int ic_set_manually __initdata = 0; /* IPconfig parameters set manually */
108
109 static int ic_enable __initdata; /* IP config enabled? */
110
111 /* Protocol choice */
112 int ic_proto_enabled __initdata = 0
113 #ifdef IPCONFIG_BOOTP
114 | IC_BOOTP
115 #endif
116 #ifdef CONFIG_IP_PNP_DHCP
117 | IC_USE_DHCP
118 #endif
119 #ifdef IPCONFIG_RARP
120 | IC_RARP
121 #endif
122 ;
123
124 static int ic_host_name_set __initdata; /* Host name set by us? */
125
126 __be32 ic_myaddr = NONE; /* My IP address */
127 static __be32 ic_netmask = NONE; /* Netmask for local subnet */
128 __be32 ic_gateway = NONE; /* Gateway IP address */
129
130 #ifdef IPCONFIG_DYNAMIC
131 static __be32 ic_addrservaddr = NONE; /* IP Address of the IP addresses'server */
132 #endif
133
134 __be32 ic_servaddr = NONE; /* Boot server IP address */
135
136 __be32 root_server_addr = NONE; /* Address of NFS server */
137 u8 root_server_path[256] = { 0, }; /* Path to mount as root */
138
139 /* vendor class identifier */
140 static char vendor_class_identifier[253] __initdata;
141
142 #if defined(CONFIG_IP_PNP_DHCP)
143 static char dhcp_client_identifier[253] __initdata;
144 #endif
145
146 /* Persistent data: */
147
148 #ifdef IPCONFIG_DYNAMIC
149 static int ic_proto_used; /* Protocol used, if any */
150 #else
151 #define ic_proto_used 0
152 #endif
153 static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */
154 static u8 ic_domain[64]; /* DNS (not NIS) domain name */
155
156 /*
157 * Private state.
158 */
159
160 /* Name of user-selected boot device */
161 static char user_dev_name[IFNAMSIZ] __initdata = { 0, };
162
163 /* Protocols supported by available interfaces */
164 static int ic_proto_have_if __initdata;
165
166 /* MTU for boot device */
167 static int ic_dev_mtu __initdata;
168
169 #ifdef IPCONFIG_DYNAMIC
170 static DEFINE_SPINLOCK(ic_recv_lock);
171 static volatile int ic_got_reply __initdata; /* Proto(s) that replied */
172 #endif
173 #ifdef IPCONFIG_DHCP
174 static int ic_dhcp_msgtype __initdata; /* DHCP msg type received */
175 #endif
176
177
178 /*
179 * Network devices
180 */
181
182 struct ic_device {
183 struct ic_device *next;
184 struct net_device *dev;
185 unsigned short flags;
186 short able;
187 __be32 xid;
188 };
189
190 static struct ic_device *ic_first_dev __initdata; /* List of open device */
191 static struct net_device *ic_dev __initdata; /* Selected device */
192
193 static bool __init ic_is_init_dev(struct net_device *dev)
194 {
195 if (dev->flags & IFF_LOOPBACK)
196 return false;
197 return user_dev_name[0] ? !strcmp(dev->name, user_dev_name) :
198 (!(dev->flags & IFF_LOOPBACK) &&
199 (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) &&
200 strncmp(dev->name, "dummy", 5));
201 }
202
203 static int __init ic_open_devs(void)
204 {
205 struct ic_device *d, **last;
206 struct net_device *dev;
207 unsigned short oflags;
208 unsigned long start, next_msg;
209
210 last = &ic_first_dev;
211 rtnl_lock();
212
213 /* bring loopback and DSA master network devices up first */
214 for_each_netdev(&init_net, dev) {
215 if (!(dev->flags & IFF_LOOPBACK) && !netdev_uses_dsa(dev))
216 continue;
217 if (dev_change_flags(dev, dev->flags | IFF_UP) < 0)
218 pr_err("IP-Config: Failed to open %s\n", dev->name);
219 }
220
221 for_each_netdev(&init_net, dev) {
222 if (ic_is_init_dev(dev)) {
223 int able = 0;
224 if (dev->mtu >= 364)
225 able |= IC_BOOTP;
226 else
227 pr_warn("DHCP/BOOTP: Ignoring device %s, MTU %d too small\n",
228 dev->name, dev->mtu);
229 if (!(dev->flags & IFF_NOARP))
230 able |= IC_RARP;
231 able &= ic_proto_enabled;
232 if (ic_proto_enabled && !able)
233 continue;
234 oflags = dev->flags;
235 if (dev_change_flags(dev, oflags | IFF_UP) < 0) {
236 pr_err("IP-Config: Failed to open %s\n",
237 dev->name);
238 continue;
239 }
240 if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) {
241 rtnl_unlock();
242 return -ENOMEM;
243 }
244 d->dev = dev;
245 *last = d;
246 last = &d->next;
247 d->flags = oflags;
248 d->able = able;
249 if (able & IC_BOOTP)
250 get_random_bytes(&d->xid, sizeof(__be32));
251 else
252 d->xid = 0;
253 ic_proto_have_if |= able;
254 pr_debug("IP-Config: %s UP (able=%d, xid=%08x)\n",
255 dev->name, able, d->xid);
256 }
257 }
258
259 /* no point in waiting if we could not bring up at least one device */
260 if (!ic_first_dev)
261 goto have_carrier;
262
263 /* wait for a carrier on at least one device */
264 start = jiffies;
265 next_msg = start + msecs_to_jiffies(CONF_CARRIER_TIMEOUT/12);
266 while (time_before(jiffies, start +
267 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 }
284 have_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
300 static 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 && !netdev_uses_dsa(dev)) {
311 pr_debug("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 * Interface to various network functions.
321 */
322
323 static inline void
324 set_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
331 static 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
342 static 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
353 static 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 * Set up interface addresses and routes.
366 */
367
368 static 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 /* Handle the case where we need non-standard MTU on the boot link (a network
395 * using jumbo frames, for instance). If we can't set the mtu, don't error
396 * out, we'll try to muddle along.
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
408 static int __init ic_setup_routes(void)
409 {
410 /* No need to setup device routes, only the default route... */
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 * Fill in default values for all missing parameters.
437 */
438
439 static int __init ic_defaults(void)
440 {
441 /*
442 * At this point we have no userspace running so need not
443 * claim locks on system_utsname
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 pr_notice("IP-Config: Guessing netmask %pI4\n",
465 &ic_netmask);
466 }
467
468 return 0;
469 }
470
471 /*
472 * RARP support.
473 */
474
475 #ifdef IPCONFIG_RARP
476
477 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
478
479 static struct packet_type rarp_packet_type __initdata = {
480 .type = cpu_to_be16(ETH_P_RARP),
481 .func = ic_rarp_recv,
482 };
483
484 static inline void __init ic_rarp_init(void)
485 {
486 dev_add_pack(&rarp_packet_type);
487 }
488
489 static inline void __init ic_rarp_cleanup(void)
490 {
491 dev_remove_pack(&rarp_packet_type);
492 }
493
494 /*
495 * Process received RARP packet.
496 */
497 static int __init
498 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
499 {
500 struct arphdr *rarp;
501 unsigned char *rarp_ptr;
502 __be32 sip, tip;
503 unsigned char *tha; /* t for "target" */
504 struct ic_device *d;
505
506 if (!net_eq(dev_net(dev), &init_net))
507 goto drop;
508
509 skb = skb_share_check(skb, GFP_ATOMIC);
510 if (!skb)
511 return NET_RX_DROP;
512
513 if (!pskb_may_pull(skb, sizeof(struct arphdr)))
514 goto drop;
515
516 /* Basic sanity checks can be done without the lock. */
517 rarp = (struct arphdr *)skb_transport_header(skb);
518
519 /* If this test doesn't pass, it's not IP, or we should
520 * ignore it anyway.
521 */
522 if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd))
523 goto drop;
524
525 /* If it's not a RARP reply, delete it. */
526 if (rarp->ar_op != htons(ARPOP_RREPLY))
527 goto drop;
528
529 /* If it's not Ethernet, delete it. */
530 if (rarp->ar_pro != htons(ETH_P_IP))
531 goto drop;
532
533 if (!pskb_may_pull(skb, arp_hdr_len(dev)))
534 goto drop;
535
536 /* OK, it is all there and looks valid, process... */
537 rarp = (struct arphdr *)skb_transport_header(skb);
538 rarp_ptr = (unsigned char *) (rarp + 1);
539
540 /* One reply at a time, please. */
541 spin_lock(&ic_recv_lock);
542
543 /* If we already have a reply, just drop the packet */
544 if (ic_got_reply)
545 goto drop_unlock;
546
547 /* Find the ic_device that the packet arrived on */
548 d = ic_first_dev;
549 while (d && d->dev != dev)
550 d = d->next;
551 if (!d)
552 goto drop_unlock; /* should never happen */
553
554 /* Extract variable-width fields */
555 rarp_ptr += dev->addr_len;
556 memcpy(&sip, rarp_ptr, 4);
557 rarp_ptr += 4;
558 tha = rarp_ptr;
559 rarp_ptr += dev->addr_len;
560 memcpy(&tip, rarp_ptr, 4);
561
562 /* Discard packets which are not meant for us. */
563 if (memcmp(tha, dev->dev_addr, dev->addr_len))
564 goto drop_unlock;
565
566 /* Discard packets which are not from specified server. */
567 if (ic_servaddr != NONE && ic_servaddr != sip)
568 goto drop_unlock;
569
570 /* We have a winner! */
571 ic_dev = dev;
572 if (ic_myaddr == NONE)
573 ic_myaddr = tip;
574 ic_servaddr = sip;
575 ic_addrservaddr = sip;
576 ic_got_reply = IC_RARP;
577
578 drop_unlock:
579 /* Show's over. Nothing to see here. */
580 spin_unlock(&ic_recv_lock);
581
582 drop:
583 /* Throw the packet out. */
584 kfree_skb(skb);
585 return 0;
586 }
587
588
589 /*
590 * Send RARP request packet over a single interface.
591 */
592 static void __init ic_rarp_send_if(struct ic_device *d)
593 {
594 struct net_device *dev = d->dev;
595 arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL,
596 dev->dev_addr, dev->dev_addr);
597 }
598 #endif
599
600 /*
601 * Predefine Nameservers
602 */
603 static inline void __init ic_nameservers_predef(void)
604 {
605 int i;
606
607 for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
608 ic_nameservers[i] = NONE;
609 }
610
611 /*
612 * DHCP/BOOTP support.
613 */
614
615 #ifdef IPCONFIG_BOOTP
616
617 struct bootp_pkt { /* BOOTP packet format */
618 struct iphdr iph; /* IP header */
619 struct udphdr udph; /* UDP header */
620 u8 op; /* 1=request, 2=reply */
621 u8 htype; /* HW address type */
622 u8 hlen; /* HW address length */
623 u8 hops; /* Used only by gateways */
624 __be32 xid; /* Transaction ID */
625 __be16 secs; /* Seconds since we started */
626 __be16 flags; /* Just what it says */
627 __be32 client_ip; /* Client's IP address if known */
628 __be32 your_ip; /* Assigned IP address */
629 __be32 server_ip; /* (Next, e.g. NFS) Server's IP address */
630 __be32 relay_ip; /* IP address of BOOTP relay */
631 u8 hw_addr[16]; /* Client's HW address */
632 u8 serv_name[64]; /* Server host name */
633 u8 boot_file[128]; /* Name of boot file */
634 u8 exten[312]; /* DHCP options / BOOTP vendor extensions */
635 };
636
637 /* packet ops */
638 #define BOOTP_REQUEST 1
639 #define BOOTP_REPLY 2
640
641 /* DHCP message types */
642 #define DHCPDISCOVER 1
643 #define DHCPOFFER 2
644 #define DHCPREQUEST 3
645 #define DHCPDECLINE 4
646 #define DHCPACK 5
647 #define DHCPNAK 6
648 #define DHCPRELEASE 7
649 #define DHCPINFORM 8
650
651 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
652
653 static struct packet_type bootp_packet_type __initdata = {
654 .type = cpu_to_be16(ETH_P_IP),
655 .func = ic_bootp_recv,
656 };
657
658 static __be32 ic_dev_xid; /* Device under configuration */
659
660 /*
661 * Initialize DHCP/BOOTP extension fields in the request.
662 */
663
664 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 };
665
666 #ifdef IPCONFIG_DHCP
667
668 static void __init
669 ic_dhcp_init_options(u8 *options)
670 {
671 u8 mt = ((ic_servaddr == NONE)
672 ? DHCPDISCOVER : DHCPREQUEST);
673 u8 *e = options;
674 int len;
675
676 pr_debug("DHCP: Sending message type %d\n", mt);
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 len = strlen(dhcp_client_identifier + 1);
732 /* the minimum length of identifier is 2, include 1 byte type,
733 * and can not be larger than the length of options
734 */
735 if (len >= 1 && len < 312 - (e - options) - 1) {
736 *e++ = 61;
737 *e++ = len + 1;
738 memcpy(e, dhcp_client_identifier, len + 1);
739 e += len + 1;
740 }
741 }
742
743 *e++ = 255; /* End of the list */
744 }
745
746 #endif /* IPCONFIG_DHCP */
747
748 static void __init ic_bootp_init_ext(u8 *e)
749 {
750 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */
751 e += 4;
752 *e++ = 1; /* Subnet mask request */
753 *e++ = 4;
754 e += 4;
755 *e++ = 3; /* Default gateway request */
756 *e++ = 4;
757 e += 4;
758 *e++ = 5; /* Name server request */
759 *e++ = 8;
760 e += 8;
761 *e++ = 12; /* Host name request */
762 *e++ = 32;
763 e += 32;
764 *e++ = 40; /* NIS Domain name request */
765 *e++ = 32;
766 e += 32;
767 *e++ = 17; /* Boot path */
768 *e++ = 40;
769 e += 40;
770
771 *e++ = 57; /* set extension buffer size for reply */
772 *e++ = 2;
773 *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */
774 *e++ = 150;
775
776 *e++ = 255; /* End of the list */
777 }
778
779
780 /*
781 * Initialize the DHCP/BOOTP mechanism.
782 */
783 static inline void __init ic_bootp_init(void)
784 {
785 ic_nameservers_predef();
786
787 dev_add_pack(&bootp_packet_type);
788 }
789
790
791 /*
792 * DHCP/BOOTP cleanup.
793 */
794 static inline void __init ic_bootp_cleanup(void)
795 {
796 dev_remove_pack(&bootp_packet_type);
797 }
798
799
800 /*
801 * Send DHCP/BOOTP request to single interface.
802 */
803 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff)
804 {
805 struct net_device *dev = d->dev;
806 struct sk_buff *skb;
807 struct bootp_pkt *b;
808 struct iphdr *h;
809 int hlen = LL_RESERVED_SPACE(dev);
810 int tlen = dev->needed_tailroom;
811
812 /* Allocate packet */
813 skb = alloc_skb(sizeof(struct bootp_pkt) + hlen + tlen + 15,
814 GFP_KERNEL);
815 if (!skb)
816 return;
817 skb_reserve(skb, hlen);
818 b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt));
819 memset(b, 0, sizeof(struct bootp_pkt));
820
821 /* Construct IP header */
822 skb_reset_network_header(skb);
823 h = ip_hdr(skb);
824 h->version = 4;
825 h->ihl = 5;
826 h->tot_len = htons(sizeof(struct bootp_pkt));
827 h->frag_off = htons(IP_DF);
828 h->ttl = 64;
829 h->protocol = IPPROTO_UDP;
830 h->daddr = htonl(INADDR_BROADCAST);
831 h->check = ip_fast_csum((unsigned char *) h, h->ihl);
832
833 /* Construct UDP header */
834 b->udph.source = htons(68);
835 b->udph.dest = htons(67);
836 b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr));
837 /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */
838
839 /* Construct DHCP/BOOTP header */
840 b->op = BOOTP_REQUEST;
841 if (dev->type < 256) /* check for false types */
842 b->htype = dev->type;
843 else if (dev->type == ARPHRD_FDDI)
844 b->htype = ARPHRD_ETHER;
845 else {
846 pr_warn("Unknown ARP type 0x%04x for device %s\n", dev->type,
847 dev->name);
848 b->htype = dev->type; /* can cause undefined behavior */
849 }
850
851 /* server_ip and your_ip address are both already zero per RFC2131 */
852 b->hlen = dev->addr_len;
853 memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
854 b->secs = htons(jiffies_diff / HZ);
855 b->xid = d->xid;
856
857 /* add DHCP options or BOOTP extensions */
858 #ifdef IPCONFIG_DHCP
859 if (ic_proto_enabled & IC_USE_DHCP)
860 ic_dhcp_init_options(b->exten);
861 else
862 #endif
863 ic_bootp_init_ext(b->exten);
864
865 /* Chain packet down the line... */
866 skb->dev = dev;
867 skb->protocol = htons(ETH_P_IP);
868 if (dev_hard_header(skb, dev, ntohs(skb->protocol),
869 dev->broadcast, dev->dev_addr, skb->len) < 0) {
870 kfree_skb(skb);
871 printk("E");
872 return;
873 }
874
875 if (dev_queue_xmit(skb) < 0)
876 printk("E");
877 }
878
879
880 /*
881 * Copy BOOTP-supplied string if not already set.
882 */
883 static int __init ic_bootp_string(char *dest, char *src, int len, int max)
884 {
885 if (!len)
886 return 0;
887 if (len > max-1)
888 len = max-1;
889 memcpy(dest, src, len);
890 dest[len] = '\0';
891 return 1;
892 }
893
894
895 /*
896 * Process BOOTP extensions.
897 */
898 static void __init ic_do_bootp_ext(u8 *ext)
899 {
900 u8 servers;
901 int i;
902 __be16 mtu;
903
904 u8 *c;
905
906 pr_debug("DHCP/BOOTP: Got extension %d:", *ext);
907 for (c=ext+2; c<ext+2+ext[1]; c++)
908 pr_debug(" %02x", *c);
909 pr_debug("\n");
910
911 switch (*ext++) {
912 case 1: /* Subnet mask */
913 if (ic_netmask == NONE)
914 memcpy(&ic_netmask, ext+1, 4);
915 break;
916 case 3: /* Default gateway */
917 if (ic_gateway == NONE)
918 memcpy(&ic_gateway, ext+1, 4);
919 break;
920 case 6: /* DNS server */
921 servers= *ext/4;
922 if (servers > CONF_NAMESERVERS_MAX)
923 servers = CONF_NAMESERVERS_MAX;
924 for (i = 0; i < servers; i++) {
925 if (ic_nameservers[i] == NONE)
926 memcpy(&ic_nameservers[i], ext+1+4*i, 4);
927 }
928 break;
929 case 12: /* Host name */
930 ic_bootp_string(utsname()->nodename, ext+1, *ext,
931 __NEW_UTS_LEN);
932 ic_host_name_set = 1;
933 break;
934 case 15: /* Domain name (DNS) */
935 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
936 break;
937 case 17: /* Root path */
938 if (!root_server_path[0])
939 ic_bootp_string(root_server_path, ext+1, *ext,
940 sizeof(root_server_path));
941 break;
942 case 26: /* Interface MTU */
943 memcpy(&mtu, ext+1, sizeof(mtu));
944 ic_dev_mtu = ntohs(mtu);
945 break;
946 case 40: /* NIS Domain name (_not_ DNS) */
947 ic_bootp_string(utsname()->domainname, ext+1, *ext,
948 __NEW_UTS_LEN);
949 break;
950 }
951 }
952
953
954 /*
955 * Receive BOOTP reply.
956 */
957 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
958 {
959 struct bootp_pkt *b;
960 struct iphdr *h;
961 struct ic_device *d;
962 int len, ext_len;
963
964 if (!net_eq(dev_net(dev), &init_net))
965 goto drop;
966
967 /* Perform verifications before taking the lock. */
968 if (skb->pkt_type == PACKET_OTHERHOST)
969 goto drop;
970
971 skb = skb_share_check(skb, GFP_ATOMIC);
972 if (!skb)
973 return NET_RX_DROP;
974
975 if (!pskb_may_pull(skb,
976 sizeof(struct iphdr) +
977 sizeof(struct udphdr)))
978 goto drop;
979
980 b = (struct bootp_pkt *)skb_network_header(skb);
981 h = &b->iph;
982
983 if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP)
984 goto drop;
985
986 /* Fragments are not supported */
987 if (ip_is_fragment(h)) {
988 net_err_ratelimited("DHCP/BOOTP: Ignoring fragmented reply\n");
989 goto drop;
990 }
991
992 if (skb->len < ntohs(h->tot_len))
993 goto drop;
994
995 if (ip_fast_csum((char *) h, h->ihl))
996 goto drop;
997
998 if (b->udph.source != htons(67) || b->udph.dest != htons(68))
999 goto drop;
1000
1001 if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
1002 goto drop;
1003
1004 len = ntohs(b->udph.len) - sizeof(struct udphdr);
1005 ext_len = len - (sizeof(*b) -
1006 sizeof(struct iphdr) -
1007 sizeof(struct udphdr) -
1008 sizeof(b->exten));
1009 if (ext_len < 0)
1010 goto drop;
1011
1012 /* Ok the front looks good, make sure we can get at the rest. */
1013 if (!pskb_may_pull(skb, skb->len))
1014 goto drop;
1015
1016 b = (struct bootp_pkt *)skb_network_header(skb);
1017 h = &b->iph;
1018
1019 /* One reply at a time, please. */
1020 spin_lock(&ic_recv_lock);
1021
1022 /* If we already have a reply, just drop the packet */
1023 if (ic_got_reply)
1024 goto drop_unlock;
1025
1026 /* Find the ic_device that the packet arrived on */
1027 d = ic_first_dev;
1028 while (d && d->dev != dev)
1029 d = d->next;
1030 if (!d)
1031 goto drop_unlock; /* should never happen */
1032
1033 /* Is it a reply to our BOOTP request? */
1034 if (b->op != BOOTP_REPLY ||
1035 b->xid != d->xid) {
1036 net_err_ratelimited("DHCP/BOOTP: Reply not for us, op[%x] xid[%x]\n",
1037 b->op, b->xid);
1038 goto drop_unlock;
1039 }
1040
1041 /* Is it a reply for the device we are configuring? */
1042 if (b->xid != ic_dev_xid) {
1043 net_err_ratelimited("DHCP/BOOTP: Ignoring delayed packet\n");
1044 goto drop_unlock;
1045 }
1046
1047 /* Parse extensions */
1048 if (ext_len >= 4 &&
1049 !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */
1050 u8 *end = (u8 *) b + ntohs(b->iph.tot_len);
1051 u8 *ext;
1052
1053 #ifdef IPCONFIG_DHCP
1054 if (ic_proto_enabled & IC_USE_DHCP) {
1055 __be32 server_id = NONE;
1056 int mt = 0;
1057
1058 ext = &b->exten[4];
1059 while (ext < end && *ext != 0xff) {
1060 u8 *opt = ext++;
1061 if (*opt == 0) /* Padding */
1062 continue;
1063 ext += *ext + 1;
1064 if (ext >= end)
1065 break;
1066 switch (*opt) {
1067 case 53: /* Message type */
1068 if (opt[1])
1069 mt = opt[2];
1070 break;
1071 case 54: /* Server ID (IP address) */
1072 if (opt[1] >= 4)
1073 memcpy(&server_id, opt + 2, 4);
1074 break;
1075 }
1076 }
1077
1078 pr_debug("DHCP: Got message type %d\n", mt);
1079
1080 switch (mt) {
1081 case DHCPOFFER:
1082 /* While in the process of accepting one offer,
1083 * ignore all others.
1084 */
1085 if (ic_myaddr != NONE)
1086 goto drop_unlock;
1087
1088 /* Let's accept that offer. */
1089 ic_myaddr = b->your_ip;
1090 ic_servaddr = server_id;
1091 pr_debug("DHCP: Offered address %pI4 by server %pI4\n",
1092 &ic_myaddr, &b->iph.saddr);
1093 /* The DHCP indicated server address takes
1094 * precedence over the bootp header one if
1095 * they are different.
1096 */
1097 if ((server_id != NONE) &&
1098 (b->server_ip != server_id))
1099 b->server_ip = ic_servaddr;
1100 break;
1101
1102 case DHCPACK:
1103 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0)
1104 goto drop_unlock;
1105
1106 /* Yeah! */
1107 break;
1108
1109 default:
1110 /* Urque. Forget it*/
1111 ic_myaddr = NONE;
1112 ic_servaddr = NONE;
1113 goto drop_unlock;
1114 }
1115
1116 ic_dhcp_msgtype = mt;
1117
1118 }
1119 #endif /* IPCONFIG_DHCP */
1120
1121 ext = &b->exten[4];
1122 while (ext < end && *ext != 0xff) {
1123 u8 *opt = ext++;
1124 if (*opt == 0) /* Padding */
1125 continue;
1126 ext += *ext + 1;
1127 if (ext < end)
1128 ic_do_bootp_ext(opt);
1129 }
1130 }
1131
1132 /* We have a winner! */
1133 ic_dev = dev;
1134 ic_myaddr = b->your_ip;
1135 ic_servaddr = b->server_ip;
1136 ic_addrservaddr = b->iph.saddr;
1137 if (ic_gateway == NONE && b->relay_ip)
1138 ic_gateway = b->relay_ip;
1139 if (ic_nameservers[0] == NONE)
1140 ic_nameservers[0] = ic_servaddr;
1141 ic_got_reply = IC_BOOTP;
1142
1143 drop_unlock:
1144 /* Show's over. Nothing to see here. */
1145 spin_unlock(&ic_recv_lock);
1146
1147 drop:
1148 /* Throw the packet out. */
1149 kfree_skb(skb);
1150
1151 return 0;
1152 }
1153
1154
1155 #endif
1156
1157
1158 /*
1159 * Dynamic IP configuration -- DHCP, BOOTP, RARP.
1160 */
1161
1162 #ifdef IPCONFIG_DYNAMIC
1163
1164 static int __init ic_dynamic(void)
1165 {
1166 int retries;
1167 struct ic_device *d;
1168 unsigned long start_jiffies, timeout, jiff;
1169 int do_bootp = ic_proto_have_if & IC_BOOTP;
1170 int do_rarp = ic_proto_have_if & IC_RARP;
1171
1172 /*
1173 * If none of DHCP/BOOTP/RARP was selected, return with an error.
1174 * This routine gets only called when some pieces of information
1175 * are missing, and without DHCP/BOOTP/RARP we are unable to get it.
1176 */
1177 if (!ic_proto_enabled) {
1178 pr_err("IP-Config: Incomplete network configuration information\n");
1179 return -1;
1180 }
1181
1182 #ifdef IPCONFIG_BOOTP
1183 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
1184 pr_err("DHCP/BOOTP: No suitable device found\n");
1185 #endif
1186 #ifdef IPCONFIG_RARP
1187 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)
1188 pr_err("RARP: No suitable device found\n");
1189 #endif
1190
1191 if (!ic_proto_have_if)
1192 /* Error message already printed */
1193 return -1;
1194
1195 /*
1196 * Setup protocols
1197 */
1198 #ifdef IPCONFIG_BOOTP
1199 if (do_bootp)
1200 ic_bootp_init();
1201 #endif
1202 #ifdef IPCONFIG_RARP
1203 if (do_rarp)
1204 ic_rarp_init();
1205 #endif
1206
1207 /*
1208 * Send requests and wait, until we get an answer. This loop
1209 * seems to be a terrible waste of CPU time, but actually there is
1210 * only one process running at all, so we don't need to use any
1211 * scheduler functions.
1212 * [Actually we could now, but the nothing else running note still
1213 * applies.. - AC]
1214 */
1215 pr_notice("Sending %s%s%s requests .",
1216 do_bootp
1217 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "",
1218 (do_bootp && do_rarp) ? " and " : "",
1219 do_rarp ? "RARP" : "");
1220
1221 start_jiffies = jiffies;
1222 d = ic_first_dev;
1223 retries = CONF_SEND_RETRIES;
1224 get_random_bytes(&timeout, sizeof(timeout));
1225 timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned int) CONF_TIMEOUT_RANDOM);
1226 for (;;) {
1227 #ifdef IPCONFIG_BOOTP
1228 /* Track the device we are configuring */
1229 ic_dev_xid = d->xid;
1230
1231 if (do_bootp && (d->able & IC_BOOTP))
1232 ic_bootp_send_if(d, jiffies - start_jiffies);
1233 #endif
1234 #ifdef IPCONFIG_RARP
1235 if (do_rarp && (d->able & IC_RARP))
1236 ic_rarp_send_if(d);
1237 #endif
1238
1239 jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout);
1240 while (time_before(jiffies, jiff) && !ic_got_reply)
1241 schedule_timeout_uninterruptible(1);
1242 #ifdef IPCONFIG_DHCP
1243 /* DHCP isn't done until we get a DHCPACK. */
1244 if ((ic_got_reply & IC_BOOTP) &&
1245 (ic_proto_enabled & IC_USE_DHCP) &&
1246 ic_dhcp_msgtype != DHCPACK) {
1247 ic_got_reply = 0;
1248 pr_cont(",");
1249 continue;
1250 }
1251 #endif /* IPCONFIG_DHCP */
1252
1253 if (ic_got_reply) {
1254 pr_cont(" OK\n");
1255 break;
1256 }
1257
1258 if ((d = d->next))
1259 continue;
1260
1261 if (! --retries) {
1262 pr_cont(" timed out!\n");
1263 break;
1264 }
1265
1266 d = ic_first_dev;
1267
1268 timeout = timeout CONF_TIMEOUT_MULT;
1269 if (timeout > CONF_TIMEOUT_MAX)
1270 timeout = CONF_TIMEOUT_MAX;
1271
1272 pr_cont(".");
1273 }
1274
1275 #ifdef IPCONFIG_BOOTP
1276 if (do_bootp)
1277 ic_bootp_cleanup();
1278 #endif
1279 #ifdef IPCONFIG_RARP
1280 if (do_rarp)
1281 ic_rarp_cleanup();
1282 #endif
1283
1284 if (!ic_got_reply) {
1285 ic_myaddr = NONE;
1286 return -1;
1287 }
1288
1289 pr_info("IP-Config: Got %s answer from %pI4, my address is %pI4\n",
1290 ((ic_got_reply & IC_RARP) ? "RARP"
1291 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),
1292 &ic_addrservaddr, &ic_myaddr);
1293
1294 return 0;
1295 }
1296
1297 #endif /* IPCONFIG_DYNAMIC */
1298
1299 #ifdef CONFIG_PROC_FS
1300
1301 static int pnp_seq_show(struct seq_file *seq, void *v)
1302 {
1303 int i;
1304
1305 if (ic_proto_used & IC_PROTO)
1306 seq_printf(seq, "#PROTO: %s\n",
1307 (ic_proto_used & IC_RARP) ? "RARP"
1308 : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP");
1309 else
1310 seq_puts(seq, "#MANUAL\n");
1311
1312 if (ic_domain[0])
1313 seq_printf(seq,
1314 "domain %s\n", ic_domain);
1315 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {
1316 if (ic_nameservers[i] != NONE)
1317 seq_printf(seq, "nameserver %pI4\n",
1318 &ic_nameservers[i]);
1319 }
1320 if (ic_servaddr != NONE)
1321 seq_printf(seq, "bootserver %pI4\n",
1322 &ic_servaddr);
1323 return 0;
1324 }
1325
1326 static int pnp_seq_open(struct inode *indoe, struct file *file)
1327 {
1328 return single_open(file, pnp_seq_show, NULL);
1329 }
1330
1331 static const struct file_operations pnp_seq_fops = {
1332 .owner = THIS_MODULE,
1333 .open = pnp_seq_open,
1334 .read = seq_read,
1335 .llseek = seq_lseek,
1336 .release = single_release,
1337 };
1338 #endif /* CONFIG_PROC_FS */
1339
1340 /*
1341 * Extract IP address from the parameter string if needed. Note that we
1342 * need to have root_server_addr set _before_ IPConfig gets called as it
1343 * can override it.
1344 */
1345 __be32 __init root_nfs_parse_addr(char *name)
1346 {
1347 __be32 addr;
1348 int octets = 0;
1349 char *cp, *cq;
1350
1351 cp = cq = name;
1352 while (octets < 4) {
1353 while (*cp >= '0' && *cp <= '9')
1354 cp++;
1355 if (cp == cq || cp - cq > 3)
1356 break;
1357 if (*cp == '.' || octets == 3)
1358 octets++;
1359 if (octets < 4)
1360 cp++;
1361 cq = cp;
1362 }
1363 if (octets == 4 && (*cp == ':' || *cp == '\0')) {
1364 if (*cp == ':')
1365 *cp++ = '\0';
1366 addr = in_aton(name);
1367 memmove(name, cp, strlen(cp) + 1);
1368 } else
1369 addr = NONE;
1370
1371 return addr;
1372 }
1373
1374 #define DEVICE_WAIT_MAX 12 /* 12 seconds */
1375
1376 static int __init wait_for_devices(void)
1377 {
1378 int i;
1379
1380 for (i = 0; i < DEVICE_WAIT_MAX; i++) {
1381 struct net_device *dev;
1382 int found = 0;
1383
1384 rtnl_lock();
1385 for_each_netdev(&init_net, dev) {
1386 if (ic_is_init_dev(dev)) {
1387 found = 1;
1388 break;
1389 }
1390 }
1391 rtnl_unlock();
1392 if (found)
1393 return 0;
1394 ssleep(1);
1395 }
1396 return -ENODEV;
1397 }
1398
1399 /*
1400 * IP Autoconfig dispatcher.
1401 */
1402
1403 static int __init ip_auto_config(void)
1404 {
1405 __be32 addr;
1406 #ifdef IPCONFIG_DYNAMIC
1407 int retries = CONF_OPEN_RETRIES;
1408 #endif
1409 int err;
1410 unsigned int i;
1411
1412 #ifdef CONFIG_PROC_FS
1413 proc_create("pnp", S_IRUGO, init_net.proc_net, &pnp_seq_fops);
1414 #endif /* CONFIG_PROC_FS */
1415
1416 if (!ic_enable)
1417 return 0;
1418
1419 pr_debug("IP-Config: Entered.\n");
1420 #ifdef IPCONFIG_DYNAMIC
1421 try_try_again:
1422 #endif
1423 /* Wait for devices to appear */
1424 err = wait_for_devices();
1425 if (err)
1426 return err;
1427
1428 /* Setup all network devices */
1429 err = ic_open_devs();
1430 if (err)
1431 return err;
1432
1433 /* Give drivers a chance to settle */
1434 msleep(CONF_POST_OPEN);
1435
1436 /*
1437 * If the config information is insufficient (e.g., our IP address or
1438 * IP address of the boot server is missing or we have multiple network
1439 * interfaces and no default was set), use BOOTP or RARP to get the
1440 * missing values.
1441 */
1442 if (ic_myaddr == NONE ||
1443 #ifdef CONFIG_ROOT_NFS
1444 (root_server_addr == NONE &&
1445 ic_servaddr == NONE &&
1446 ROOT_DEV == Root_NFS) ||
1447 #endif
1448 ic_first_dev->next) {
1449 #ifdef IPCONFIG_DYNAMIC
1450 if (ic_dynamic() < 0) {
1451 ic_close_devs();
1452
1453 /*
1454 * I don't know why, but sometimes the
1455 * eepro100 driver (at least) gets upset and
1456 * doesn't work the first time it's opened.
1457 * But then if you close it and reopen it, it
1458 * works just fine. So we need to try that at
1459 * least once before giving up.
1460 *
1461 * Also, if the root will be NFS-mounted, we
1462 * have nowhere to go if DHCP fails. So we
1463 * just have to keep trying forever.
1464 *
1465 * -- Chip
1466 */
1467 #ifdef CONFIG_ROOT_NFS
1468 if (ROOT_DEV == Root_NFS) {
1469 pr_err("IP-Config: Retrying forever (NFS root)...\n");
1470 goto try_try_again;
1471 }
1472 #endif
1473
1474 if (--retries) {
1475 pr_err("IP-Config: Reopening network devices...\n");
1476 goto try_try_again;
1477 }
1478
1479 /* Oh, well. At least we tried. */
1480 pr_err("IP-Config: Auto-configuration of network failed\n");
1481 return -1;
1482 }
1483 #else /* !DYNAMIC */
1484 pr_err("IP-Config: Incomplete network configuration information\n");
1485 ic_close_devs();
1486 return -1;
1487 #endif /* IPCONFIG_DYNAMIC */
1488 } else {
1489 /* Device selected manually or only one device -> use it */
1490 ic_dev = ic_first_dev->dev;
1491 }
1492
1493 addr = root_nfs_parse_addr(root_server_path);
1494 if (root_server_addr == NONE)
1495 root_server_addr = addr;
1496
1497 /*
1498 * Use defaults wherever applicable.
1499 */
1500 if (ic_defaults() < 0)
1501 return -1;
1502
1503 /*
1504 * Close all network devices except the device we've
1505 * autoconfigured and set up routes.
1506 */
1507 ic_close_devs();
1508 if (ic_setup_if() < 0 || ic_setup_routes() < 0)
1509 return -1;
1510
1511 /*
1512 * Record which protocol was actually used.
1513 */
1514 #ifdef IPCONFIG_DYNAMIC
1515 ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP);
1516 #endif
1517
1518 #ifndef IPCONFIG_SILENT
1519 /*
1520 * Clue in the operator.
1521 */
1522 pr_info("IP-Config: Complete:\n");
1523
1524 pr_info(" device=%s, hwaddr=%*phC, ipaddr=%pI4, mask=%pI4, gw=%pI4\n",
1525 ic_dev->name, ic_dev->addr_len, ic_dev->dev_addr,
1526 &ic_myaddr, &ic_netmask, &ic_gateway);
1527 pr_info(" host=%s, domain=%s, nis-domain=%s\n",
1528 utsname()->nodename, ic_domain, utsname()->domainname);
1529 pr_info(" bootserver=%pI4, rootserver=%pI4, rootpath=%s",
1530 &ic_servaddr, &root_server_addr, root_server_path);
1531 if (ic_dev_mtu)
1532 pr_cont(", mtu=%d", ic_dev_mtu);
1533 for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
1534 if (ic_nameservers[i] != NONE) {
1535 pr_cont(" nameserver%u=%pI4",
1536 i, &ic_nameservers[i]);
1537 break;
1538 }
1539 for (i++; i < CONF_NAMESERVERS_MAX; i++)
1540 if (ic_nameservers[i] != NONE)
1541 pr_cont(", nameserver%u=%pI4", i, &ic_nameservers[i]);
1542 pr_cont("\n");
1543 #endif /* !SILENT */
1544
1545 return 0;
1546 }
1547
1548 late_initcall(ip_auto_config);
1549
1550
1551 /*
1552 * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
1553 * command line parameter. See Documentation/filesystems/nfs/nfsroot.txt.
1554 */
1555 static int __init ic_proto_name(char *name)
1556 {
1557 if (!strcmp(name, "on") || !strcmp(name, "any")) {
1558 return 1;
1559 }
1560 if (!strcmp(name, "off") || !strcmp(name, "none")) {
1561 return 0;
1562 }
1563 #ifdef CONFIG_IP_PNP_DHCP
1564 else if (!strncmp(name, "dhcp", 4)) {
1565 char *client_id;
1566
1567 ic_proto_enabled &= ~IC_RARP;
1568 client_id = strstr(name, "dhcp,");
1569 if (client_id) {
1570 char *v;
1571
1572 client_id = client_id + 5;
1573 v = strchr(client_id, ',');
1574 if (!v)
1575 return 1;
1576 *v = 0;
1577 if (kstrtou8(client_id, 0, dhcp_client_identifier))
1578 pr_debug("DHCP: Invalid client identifier type\n");
1579 strncpy(dhcp_client_identifier + 1, v + 1, 251);
1580 *v = ',';
1581 }
1582 return 1;
1583 }
1584 #endif
1585 #ifdef CONFIG_IP_PNP_BOOTP
1586 else if (!strcmp(name, "bootp")) {
1587 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP);
1588 return 1;
1589 }
1590 #endif
1591 #ifdef CONFIG_IP_PNP_RARP
1592 else if (!strcmp(name, "rarp")) {
1593 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP);
1594 return 1;
1595 }
1596 #endif
1597 #ifdef IPCONFIG_DYNAMIC
1598 else if (!strcmp(name, "both")) {
1599 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */
1600 return 1;
1601 }
1602 #endif
1603 return 0;
1604 }
1605
1606 static int __init ip_auto_config_setup(char *addrs)
1607 {
1608 char *cp, *ip, *dp;
1609 int num = 0;
1610
1611 ic_set_manually = 1;
1612 ic_enable = 1;
1613
1614 /*
1615 * If any dhcp, bootp etc options are set, leave autoconfig on
1616 * and skip the below static IP processing.
1617 */
1618 if (ic_proto_name(addrs))
1619 return 1;
1620
1621 /* If no static IP is given, turn off autoconfig and bail. */
1622 if (*addrs == 0 ||
1623 strcmp(addrs, "off") == 0 ||
1624 strcmp(addrs, "none") == 0) {
1625 ic_enable = 0;
1626 return 1;
1627 }
1628
1629 ic_nameservers_predef();
1630
1631 /* Parse string for static IP assignment. */
1632 ip = addrs;
1633 while (ip && *ip) {
1634 if ((cp = strchr(ip, ':')))
1635 *cp++ = '\0';
1636 if (strlen(ip) > 0) {
1637 pr_debug("IP-Config: Parameter #%d: `%s'\n", num, ip);
1638 switch (num) {
1639 case 0:
1640 if ((ic_myaddr = in_aton(ip)) == ANY)
1641 ic_myaddr = NONE;
1642 break;
1643 case 1:
1644 if ((ic_servaddr = in_aton(ip)) == ANY)
1645 ic_servaddr = NONE;
1646 break;
1647 case 2:
1648 if ((ic_gateway = in_aton(ip)) == ANY)
1649 ic_gateway = NONE;
1650 break;
1651 case 3:
1652 if ((ic_netmask = in_aton(ip)) == ANY)
1653 ic_netmask = NONE;
1654 break;
1655 case 4:
1656 if ((dp = strchr(ip, '.'))) {
1657 *dp++ = '\0';
1658 strlcpy(utsname()->domainname, dp,
1659 sizeof(utsname()->domainname));
1660 }
1661 strlcpy(utsname()->nodename, ip,
1662 sizeof(utsname()->nodename));
1663 ic_host_name_set = 1;
1664 break;
1665 case 5:
1666 strlcpy(user_dev_name, ip, sizeof(user_dev_name));
1667 break;
1668 case 6:
1669 if (ic_proto_name(ip) == 0 &&
1670 ic_myaddr == NONE) {
1671 ic_enable = 0;
1672 }
1673 break;
1674 case 7:
1675 if (CONF_NAMESERVERS_MAX >= 1) {
1676 ic_nameservers[0] = in_aton(ip);
1677 if (ic_nameservers[0] == ANY)
1678 ic_nameservers[0] = NONE;
1679 }
1680 break;
1681 case 8:
1682 if (CONF_NAMESERVERS_MAX >= 2) {
1683 ic_nameservers[1] = in_aton(ip);
1684 if (ic_nameservers[1] == ANY)
1685 ic_nameservers[1] = NONE;
1686 }
1687 break;
1688 }
1689 }
1690 ip = cp;
1691 num++;
1692 }
1693
1694 return 1;
1695 }
1696 __setup("ip=", ip_auto_config_setup);
1697
1698 static int __init nfsaddrs_config_setup(char *addrs)
1699 {
1700 return ip_auto_config_setup(addrs);
1701 }
1702 __setup("nfsaddrs=", nfsaddrs_config_setup);
1703
1704 static int __init vendor_class_identifier_setup(char *addrs)
1705 {
1706 if (strlcpy(vendor_class_identifier, addrs,
1707 sizeof(vendor_class_identifier))
1708 >= sizeof(vendor_class_identifier))
1709 pr_warn("DHCP: vendorclass too long, truncated to \"%s\"\n",
1710 vendor_class_identifier);
1711 return 1;
1712 }
1713 __setup("dhcpclass=", vendor_class_identifier_setup);
Linux kernel - Deliverables
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