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[mirror_ubuntu-bionic-kernel.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 <linux/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_BASE_TIMEOUT (HZ*2) /* Initial timeout: 2 seconds */
89 #define CONF_TIMEOUT_RANDOM (HZ) /* Maximum amount of randomization */
90 #define CONF_TIMEOUT_MULT *7/4 /* Rate of timeout growth */
91 #define CONF_TIMEOUT_MAX (HZ*30) /* Maximum allowed timeout */
92 #define CONF_NAMESERVERS_MAX 3 /* Maximum number of nameservers
93 - '3' from resolv.h */
94
95 #define NONE cpu_to_be32(INADDR_NONE)
96 #define ANY cpu_to_be32(INADDR_ANY)
97
98 /*
99 * Public IP configuration
100 */
101
102 /* This is used by platforms which might be able to set the ipconfig
103 * variables using firmware environment vars. If this is set, it will
104 * ignore such firmware variables.
105 */
106 int ic_set_manually __initdata = 0; /* IPconfig parameters set manually */
107
108 static int ic_enable __initdata; /* IP config enabled? */
109
110 /* Protocol choice */
111 int ic_proto_enabled __initdata = 0
112 #ifdef IPCONFIG_BOOTP
113 | IC_BOOTP
114 #endif
115 #ifdef CONFIG_IP_PNP_DHCP
116 | IC_USE_DHCP
117 #endif
118 #ifdef IPCONFIG_RARP
119 | IC_RARP
120 #endif
121 ;
122
123 static int ic_host_name_set __initdata; /* Host name set by us? */
124
125 __be32 ic_myaddr = NONE; /* My IP address */
126 static __be32 ic_netmask = NONE; /* Netmask for local subnet */
127 __be32 ic_gateway = NONE; /* Gateway IP address */
128
129 #ifdef IPCONFIG_DYNAMIC
130 static __be32 ic_addrservaddr = NONE; /* IP Address of the IP addresses'server */
131 #endif
132
133 __be32 ic_servaddr = NONE; /* Boot server IP address */
134
135 __be32 root_server_addr = NONE; /* Address of NFS server */
136 u8 root_server_path[256] = { 0, }; /* Path to mount as root */
137
138 /* vendor class identifier */
139 static char vendor_class_identifier[253] __initdata;
140
141 #if defined(CONFIG_IP_PNP_DHCP)
142 static char dhcp_client_identifier[253] __initdata;
143 #endif
144
145 /* Persistent data: */
146
147 #ifdef IPCONFIG_DYNAMIC
148 static int ic_proto_used; /* Protocol used, if any */
149 #else
150 #define ic_proto_used 0
151 #endif
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 ic_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\n",
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 pr_debug("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 (d != ic_dev && !netdev_uses_dsa(dev)) {
310 pr_debug("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->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->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 pr_notice("IP-Config: Guessing netmask %pI4\n",
464 &ic_netmask);
465 }
466
467 return 0;
468 }
469
470 /*
471 * RARP support.
472 */
473
474 #ifdef IPCONFIG_RARP
475
476 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
477
478 static struct packet_type rarp_packet_type __initdata = {
479 .type = cpu_to_be16(ETH_P_RARP),
480 .func = ic_rarp_recv,
481 };
482
483 static inline void __init ic_rarp_init(void)
484 {
485 dev_add_pack(&rarp_packet_type);
486 }
487
488 static inline void __init ic_rarp_cleanup(void)
489 {
490 dev_remove_pack(&rarp_packet_type);
491 }
492
493 /*
494 * Process received RARP packet.
495 */
496 static int __init
497 ic_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 *tha; /* t for "target" */
503 struct ic_device *d;
504
505 if (!net_eq(dev_net(dev), &init_net))
506 goto drop;
507
508 skb = skb_share_check(skb, GFP_ATOMIC);
509 if (!skb)
510 return NET_RX_DROP;
511
512 if (!pskb_may_pull(skb, sizeof(struct arphdr)))
513 goto drop;
514
515 /* Basic sanity checks can be done without the lock. */
516 rarp = (struct arphdr *)skb_transport_header(skb);
517
518 /* If this test doesn't pass, it's not IP, or we should
519 * ignore it anyway.
520 */
521 if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd))
522 goto drop;
523
524 /* If it's not a RARP reply, delete it. */
525 if (rarp->ar_op != htons(ARPOP_RREPLY))
526 goto drop;
527
528 /* If it's not Ethernet, delete it. */
529 if (rarp->ar_pro != htons(ETH_P_IP))
530 goto drop;
531
532 if (!pskb_may_pull(skb, arp_hdr_len(dev)))
533 goto drop;
534
535 /* OK, it is all there and looks valid, process... */
536 rarp = (struct arphdr *)skb_transport_header(skb);
537 rarp_ptr = (unsigned char *) (rarp + 1);
538
539 /* One reply at a time, please. */
540 spin_lock(&ic_recv_lock);
541
542 /* If we already have a reply, just drop the packet */
543 if (ic_got_reply)
544 goto drop_unlock;
545
546 /* Find the ic_device that the packet arrived on */
547 d = ic_first_dev;
548 while (d && d->dev != dev)
549 d = d->next;
550 if (!d)
551 goto drop_unlock; /* should never happen */
552
553 /* Extract variable-width fields */
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 /* Discard packets which are not meant for us. */
562 if (memcmp(tha, dev->dev_addr, dev->addr_len))
563 goto drop_unlock;
564
565 /* Discard packets which are not from specified server. */
566 if (ic_servaddr != NONE && ic_servaddr != sip)
567 goto drop_unlock;
568
569 /* We have a winner! */
570 ic_dev = d;
571 if (ic_myaddr == NONE)
572 ic_myaddr = tip;
573 ic_servaddr = sip;
574 ic_addrservaddr = sip;
575 ic_got_reply = IC_RARP;
576
577 drop_unlock:
578 /* Show's over. Nothing to see here. */
579 spin_unlock(&ic_recv_lock);
580
581 drop:
582 /* Throw the packet out. */
583 kfree_skb(skb);
584 return 0;
585 }
586
587
588 /*
589 * Send RARP request packet over a single interface.
590 */
591 static 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 * Predefine Nameservers
601 */
602 static 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 * DHCP/BOOTP support.
612 */
613
614 #ifdef IPCONFIG_BOOTP
615
616 struct bootp_pkt { /* BOOTP packet format */
617 struct iphdr iph; /* IP header */
618 struct udphdr udph; /* UDP header */
619 u8 op; /* 1=request, 2=reply */
620 u8 htype; /* HW address type */
621 u8 hlen; /* HW address length */
622 u8 hops; /* Used only by gateways */
623 __be32 xid; /* Transaction ID */
624 __be16 secs; /* Seconds since we started */
625 __be16 flags; /* Just what it says */
626 __be32 client_ip; /* Client's IP address if known */
627 __be32 your_ip; /* Assigned IP address */
628 __be32 server_ip; /* (Next, e.g. NFS) Server's IP address */
629 __be32 relay_ip; /* IP address of BOOTP relay */
630 u8 hw_addr[16]; /* Client's HW address */
631 u8 serv_name[64]; /* Server host name */
632 u8 boot_file[128]; /* Name of boot file */
633 u8 exten[312]; /* DHCP options / BOOTP vendor extensions */
634 };
635
636 /* packet ops */
637 #define BOOTP_REQUEST 1
638 #define BOOTP_REPLY 2
639
640 /* DHCP message types */
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
650 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
651
652 static struct packet_type bootp_packet_type __initdata = {
653 .type = cpu_to_be16(ETH_P_IP),
654 .func = ic_bootp_recv,
655 };
656
657 /*
658 * Initialize DHCP/BOOTP extension fields in the request.
659 */
660
661 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 };
662
663 #ifdef IPCONFIG_DHCP
664
665 static void __init
666 ic_dhcp_init_options(u8 *options, struct ic_device *d)
667 {
668 u8 mt = ((ic_servaddr == NONE)
669 ? DHCPDISCOVER : DHCPREQUEST);
670 u8 *e = options;
671 int len;
672
673 pr_debug("DHCP: Sending message type %d (%s)\n", mt, d->dev->name);
674
675 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */
676 e += 4;
677
678 *e++ = 53; /* DHCP message type */
679 *e++ = 1;
680 *e++ = mt;
681
682 if (mt == DHCPREQUEST) {
683 *e++ = 54; /* Server ID (IP address) */
684 *e++ = 4;
685 memcpy(e, &ic_servaddr, 4);
686 e += 4;
687
688 *e++ = 50; /* Requested IP address */
689 *e++ = 4;
690 memcpy(e, &ic_myaddr, 4);
691 e += 4;
692 }
693
694 /* always? */
695 {
696 static const u8 ic_req_params[] = {
697 1, /* Subnet mask */
698 3, /* Default gateway */
699 6, /* DNS server */
700 12, /* Host name */
701 15, /* Domain name */
702 17, /* Boot path */
703 26, /* MTU */
704 40, /* NIS domain name */
705 };
706
707 *e++ = 55; /* Parameter request list */
708 *e++ = sizeof(ic_req_params);
709 memcpy(e, ic_req_params, sizeof(ic_req_params));
710 e += sizeof(ic_req_params);
711
712 if (ic_host_name_set) {
713 *e++ = 12; /* host-name */
714 len = strlen(utsname()->nodename);
715 *e++ = len;
716 memcpy(e, utsname()->nodename, len);
717 e += len;
718 }
719 if (*vendor_class_identifier) {
720 pr_info("DHCP: sending class identifier \"%s\"\n",
721 vendor_class_identifier);
722 *e++ = 60; /* Class-identifier */
723 len = strlen(vendor_class_identifier);
724 *e++ = len;
725 memcpy(e, vendor_class_identifier, len);
726 e += len;
727 }
728 len = strlen(dhcp_client_identifier + 1);
729 /* the minimum length of identifier is 2, include 1 byte type,
730 * and can not be larger than the length of options
731 */
732 if (len >= 1 && len < 312 - (e - options) - 1) {
733 *e++ = 61;
734 *e++ = len + 1;
735 memcpy(e, dhcp_client_identifier, len + 1);
736 e += len + 1;
737 }
738 }
739
740 *e++ = 255; /* End of the list */
741 }
742
743 #endif /* IPCONFIG_DHCP */
744
745 static void __init ic_bootp_init_ext(u8 *e)
746 {
747 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */
748 e += 4;
749 *e++ = 1; /* Subnet mask request */
750 *e++ = 4;
751 e += 4;
752 *e++ = 3; /* Default gateway request */
753 *e++ = 4;
754 e += 4;
755 *e++ = 5; /* Name server request */
756 *e++ = 8;
757 e += 8;
758 *e++ = 12; /* Host name request */
759 *e++ = 32;
760 e += 32;
761 *e++ = 40; /* NIS Domain name request */
762 *e++ = 32;
763 e += 32;
764 *e++ = 17; /* Boot path */
765 *e++ = 40;
766 e += 40;
767
768 *e++ = 57; /* set extension buffer size for reply */
769 *e++ = 2;
770 *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */
771 *e++ = 150;
772
773 *e++ = 255; /* End of the list */
774 }
775
776
777 /*
778 * Initialize the DHCP/BOOTP mechanism.
779 */
780 static inline void __init ic_bootp_init(void)
781 {
782 ic_nameservers_predef();
783
784 dev_add_pack(&bootp_packet_type);
785 }
786
787
788 /*
789 * DHCP/BOOTP cleanup.
790 */
791 static inline void __init ic_bootp_cleanup(void)
792 {
793 dev_remove_pack(&bootp_packet_type);
794 }
795
796
797 /*
798 * Send DHCP/BOOTP request to single interface.
799 */
800 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff)
801 {
802 struct net_device *dev = d->dev;
803 struct sk_buff *skb;
804 struct bootp_pkt *b;
805 struct iphdr *h;
806 int hlen = LL_RESERVED_SPACE(dev);
807 int tlen = dev->needed_tailroom;
808
809 /* Allocate packet */
810 skb = alloc_skb(sizeof(struct bootp_pkt) + hlen + tlen + 15,
811 GFP_KERNEL);
812 if (!skb)
813 return;
814 skb_reserve(skb, hlen);
815 b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt));
816 memset(b, 0, sizeof(struct bootp_pkt));
817
818 /* Construct IP header */
819 skb_reset_network_header(skb);
820 h = ip_hdr(skb);
821 h->version = 4;
822 h->ihl = 5;
823 h->tot_len = htons(sizeof(struct bootp_pkt));
824 h->frag_off = htons(IP_DF);
825 h->ttl = 64;
826 h->protocol = IPPROTO_UDP;
827 h->daddr = htonl(INADDR_BROADCAST);
828 h->check = ip_fast_csum((unsigned char *) h, h->ihl);
829
830 /* Construct UDP header */
831 b->udph.source = htons(68);
832 b->udph.dest = htons(67);
833 b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr));
834 /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */
835
836 /* Construct DHCP/BOOTP header */
837 b->op = BOOTP_REQUEST;
838 if (dev->type < 256) /* check for false types */
839 b->htype = dev->type;
840 else if (dev->type == ARPHRD_FDDI)
841 b->htype = ARPHRD_ETHER;
842 else {
843 pr_warn("Unknown ARP type 0x%04x for device %s\n", dev->type,
844 dev->name);
845 b->htype = dev->type; /* can cause undefined behavior */
846 }
847
848 /* server_ip and your_ip address are both already zero per RFC2131 */
849 b->hlen = dev->addr_len;
850 memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
851 b->secs = htons(jiffies_diff / HZ);
852 b->xid = d->xid;
853
854 /* add DHCP options or BOOTP extensions */
855 #ifdef IPCONFIG_DHCP
856 if (ic_proto_enabled & IC_USE_DHCP)
857 ic_dhcp_init_options(b->exten, d);
858 else
859 #endif
860 ic_bootp_init_ext(b->exten);
861
862 /* Chain packet down the line... */
863 skb->dev = dev;
864 skb->protocol = htons(ETH_P_IP);
865 if (dev_hard_header(skb, dev, ntohs(skb->protocol),
866 dev->broadcast, dev->dev_addr, skb->len) < 0) {
867 kfree_skb(skb);
868 printk("E");
869 return;
870 }
871
872 if (dev_queue_xmit(skb) < 0)
873 printk("E");
874 }
875
876
877 /*
878 * Copy BOOTP-supplied string if not already set.
879 */
880 static int __init ic_bootp_string(char *dest, char *src, int len, int max)
881 {
882 if (!len)
883 return 0;
884 if (len > max-1)
885 len = max-1;
886 memcpy(dest, src, len);
887 dest[len] = '\0';
888 return 1;
889 }
890
891
892 /*
893 * Process BOOTP extensions.
894 */
895 static void __init ic_do_bootp_ext(u8 *ext)
896 {
897 u8 servers;
898 int i;
899 __be16 mtu;
900
901 u8 *c;
902
903 pr_debug("DHCP/BOOTP: Got extension %d:", *ext);
904 for (c=ext+2; c<ext+2+ext[1]; c++)
905 pr_debug(" %02x", *c);
906 pr_debug("\n");
907
908 switch (*ext++) {
909 case 1: /* Subnet mask */
910 if (ic_netmask == NONE)
911 memcpy(&ic_netmask, ext+1, 4);
912 break;
913 case 3: /* Default gateway */
914 if (ic_gateway == NONE)
915 memcpy(&ic_gateway, ext+1, 4);
916 break;
917 case 6: /* DNS server */
918 servers= *ext/4;
919 if (servers > CONF_NAMESERVERS_MAX)
920 servers = CONF_NAMESERVERS_MAX;
921 for (i = 0; i < servers; i++) {
922 if (ic_nameservers[i] == NONE)
923 memcpy(&ic_nameservers[i], ext+1+4*i, 4);
924 }
925 break;
926 case 12: /* Host name */
927 ic_bootp_string(utsname()->nodename, ext+1, *ext,
928 __NEW_UTS_LEN);
929 ic_host_name_set = 1;
930 break;
931 case 15: /* Domain name (DNS) */
932 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
933 break;
934 case 17: /* Root path */
935 if (!root_server_path[0])
936 ic_bootp_string(root_server_path, ext+1, *ext,
937 sizeof(root_server_path));
938 break;
939 case 26: /* Interface MTU */
940 memcpy(&mtu, ext+1, sizeof(mtu));
941 ic_dev_mtu = ntohs(mtu);
942 break;
943 case 40: /* NIS Domain name (_not_ DNS) */
944 ic_bootp_string(utsname()->domainname, ext+1, *ext,
945 __NEW_UTS_LEN);
946 break;
947 }
948 }
949
950
951 /*
952 * Receive BOOTP reply.
953 */
954 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
955 {
956 struct bootp_pkt *b;
957 struct iphdr *h;
958 struct ic_device *d;
959 int len, ext_len;
960
961 if (!net_eq(dev_net(dev), &init_net))
962 goto drop;
963
964 /* Perform verifications before taking the lock. */
965 if (skb->pkt_type == PACKET_OTHERHOST)
966 goto drop;
967
968 skb = skb_share_check(skb, GFP_ATOMIC);
969 if (!skb)
970 return NET_RX_DROP;
971
972 if (!pskb_may_pull(skb,
973 sizeof(struct iphdr) +
974 sizeof(struct udphdr)))
975 goto drop;
976
977 b = (struct bootp_pkt *)skb_network_header(skb);
978 h = &b->iph;
979
980 if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP)
981 goto drop;
982
983 /* Fragments are not supported */
984 if (ip_is_fragment(h)) {
985 net_err_ratelimited("DHCP/BOOTP: Ignoring fragmented reply\n");
986 goto drop;
987 }
988
989 if (skb->len < ntohs(h->tot_len))
990 goto drop;
991
992 if (ip_fast_csum((char *) h, h->ihl))
993 goto drop;
994
995 if (b->udph.source != htons(67) || b->udph.dest != htons(68))
996 goto drop;
997
998 if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
999 goto drop;
1000
1001 len = ntohs(b->udph.len) - sizeof(struct udphdr);
1002 ext_len = len - (sizeof(*b) -
1003 sizeof(struct iphdr) -
1004 sizeof(struct udphdr) -
1005 sizeof(b->exten));
1006 if (ext_len < 0)
1007 goto drop;
1008
1009 /* Ok the front looks good, make sure we can get at the rest. */
1010 if (!pskb_may_pull(skb, skb->len))
1011 goto drop;
1012
1013 b = (struct bootp_pkt *)skb_network_header(skb);
1014 h = &b->iph;
1015
1016 /* One reply at a time, please. */
1017 spin_lock(&ic_recv_lock);
1018
1019 /* If we already have a reply, just drop the packet */
1020 if (ic_got_reply)
1021 goto drop_unlock;
1022
1023 /* Find the ic_device that the packet arrived on */
1024 d = ic_first_dev;
1025 while (d && d->dev != dev)
1026 d = d->next;
1027 if (!d)
1028 goto drop_unlock; /* should never happen */
1029
1030 /* Is it a reply to our BOOTP request? */
1031 if (b->op != BOOTP_REPLY ||
1032 b->xid != d->xid) {
1033 net_err_ratelimited("DHCP/BOOTP: Reply not for us on %s, op[%x] xid[%x]\n",
1034 d->dev->name, b->op, b->xid);
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 pr_debug("DHCP: Got message type %d (%s)\n", mt, d->dev->name);
1070
1071 switch (mt) {
1072 case DHCPOFFER:
1073 /* While in the process of accepting one offer,
1074 * ignore all others.
1075 */
1076 if (ic_myaddr != NONE)
1077 goto drop_unlock;
1078
1079 /* Let's accept that offer. */
1080 ic_myaddr = b->your_ip;
1081 ic_servaddr = server_id;
1082 pr_debug("DHCP: Offered address %pI4 by server %pI4\n",
1083 &ic_myaddr, &b->iph.saddr);
1084 /* The DHCP indicated server address takes
1085 * precedence over the bootp header one if
1086 * they are different.
1087 */
1088 if ((server_id != NONE) &&
1089 (b->server_ip != server_id))
1090 b->server_ip = ic_servaddr;
1091 break;
1092
1093 case DHCPACK:
1094 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0)
1095 goto drop_unlock;
1096
1097 /* Yeah! */
1098 break;
1099
1100 default:
1101 /* Urque. Forget it*/
1102 ic_myaddr = NONE;
1103 ic_servaddr = NONE;
1104 goto drop_unlock;
1105 }
1106
1107 ic_dhcp_msgtype = mt;
1108
1109 }
1110 #endif /* IPCONFIG_DHCP */
1111
1112 ext = &b->exten[4];
1113 while (ext < end && *ext != 0xff) {
1114 u8 *opt = ext++;
1115 if (*opt == 0) /* Padding */
1116 continue;
1117 ext += *ext + 1;
1118 if (ext < end)
1119 ic_do_bootp_ext(opt);
1120 }
1121 }
1122
1123 /* We have a winner! */
1124 ic_dev = d;
1125 ic_myaddr = b->your_ip;
1126 ic_servaddr = b->server_ip;
1127 ic_addrservaddr = b->iph.saddr;
1128 if (ic_gateway == NONE && b->relay_ip)
1129 ic_gateway = b->relay_ip;
1130 if (ic_nameservers[0] == NONE)
1131 ic_nameservers[0] = ic_servaddr;
1132 ic_got_reply = IC_BOOTP;
1133
1134 drop_unlock:
1135 /* Show's over. Nothing to see here. */
1136 spin_unlock(&ic_recv_lock);
1137
1138 drop:
1139 /* Throw the packet out. */
1140 kfree_skb(skb);
1141
1142 return 0;
1143 }
1144
1145
1146 #endif
1147
1148
1149 /*
1150 * Dynamic IP configuration -- DHCP, BOOTP, RARP.
1151 */
1152
1153 #ifdef IPCONFIG_DYNAMIC
1154
1155 static int __init ic_dynamic(void)
1156 {
1157 int retries;
1158 struct ic_device *d;
1159 unsigned long start_jiffies, timeout, jiff;
1160 int do_bootp = ic_proto_have_if & IC_BOOTP;
1161 int do_rarp = ic_proto_have_if & IC_RARP;
1162
1163 /*
1164 * If none of DHCP/BOOTP/RARP was selected, return with an error.
1165 * This routine gets only called when some pieces of information
1166 * are missing, and without DHCP/BOOTP/RARP we are unable to get it.
1167 */
1168 if (!ic_proto_enabled) {
1169 pr_err("IP-Config: Incomplete network configuration information\n");
1170 return -1;
1171 }
1172
1173 #ifdef IPCONFIG_BOOTP
1174 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
1175 pr_err("DHCP/BOOTP: No suitable device found\n");
1176 #endif
1177 #ifdef IPCONFIG_RARP
1178 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)
1179 pr_err("RARP: No suitable device found\n");
1180 #endif
1181
1182 if (!ic_proto_have_if)
1183 /* Error message already printed */
1184 return -1;
1185
1186 /*
1187 * Setup protocols
1188 */
1189 #ifdef IPCONFIG_BOOTP
1190 if (do_bootp)
1191 ic_bootp_init();
1192 #endif
1193 #ifdef IPCONFIG_RARP
1194 if (do_rarp)
1195 ic_rarp_init();
1196 #endif
1197
1198 /*
1199 * Send requests and wait, until we get an answer. This loop
1200 * seems to be a terrible waste of CPU time, but actually there is
1201 * only one process running at all, so we don't need to use any
1202 * scheduler functions.
1203 * [Actually we could now, but the nothing else running note still
1204 * applies.. - AC]
1205 */
1206 pr_notice("Sending %s%s%s requests .",
1207 do_bootp
1208 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "",
1209 (do_bootp && do_rarp) ? " and " : "",
1210 do_rarp ? "RARP" : "");
1211
1212 start_jiffies = jiffies;
1213 d = ic_first_dev;
1214 retries = CONF_SEND_RETRIES;
1215 get_random_bytes(&timeout, sizeof(timeout));
1216 timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned int) CONF_TIMEOUT_RANDOM);
1217 for (;;) {
1218 #ifdef IPCONFIG_BOOTP
1219 if (do_bootp && (d->able & IC_BOOTP))
1220 ic_bootp_send_if(d, jiffies - start_jiffies);
1221 #endif
1222 #ifdef IPCONFIG_RARP
1223 if (do_rarp && (d->able & IC_RARP))
1224 ic_rarp_send_if(d);
1225 #endif
1226
1227 if (!d->next) {
1228 jiff = jiffies + timeout;
1229 while (time_before(jiffies, jiff) && !ic_got_reply)
1230 schedule_timeout_uninterruptible(1);
1231 }
1232 #ifdef IPCONFIG_DHCP
1233 /* DHCP isn't done until we get a DHCPACK. */
1234 if ((ic_got_reply & IC_BOOTP) &&
1235 (ic_proto_enabled & IC_USE_DHCP) &&
1236 ic_dhcp_msgtype != DHCPACK) {
1237 ic_got_reply = 0;
1238 /* continue on device that got the reply */
1239 d = ic_dev;
1240 pr_cont(",");
1241 continue;
1242 }
1243 #endif /* IPCONFIG_DHCP */
1244
1245 if (ic_got_reply) {
1246 pr_cont(" OK\n");
1247 break;
1248 }
1249
1250 if ((d = d->next))
1251 continue;
1252
1253 if (! --retries) {
1254 pr_cont(" timed out!\n");
1255 break;
1256 }
1257
1258 d = ic_first_dev;
1259
1260 timeout = timeout CONF_TIMEOUT_MULT;
1261 if (timeout > CONF_TIMEOUT_MAX)
1262 timeout = CONF_TIMEOUT_MAX;
1263
1264 pr_cont(".");
1265 }
1266
1267 #ifdef IPCONFIG_BOOTP
1268 if (do_bootp)
1269 ic_bootp_cleanup();
1270 #endif
1271 #ifdef IPCONFIG_RARP
1272 if (do_rarp)
1273 ic_rarp_cleanup();
1274 #endif
1275
1276 if (!ic_got_reply) {
1277 ic_myaddr = NONE;
1278 return -1;
1279 }
1280
1281 pr_info("IP-Config: Got %s answer from %pI4, my address is %pI4\n",
1282 ((ic_got_reply & IC_RARP) ? "RARP"
1283 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),
1284 &ic_addrservaddr, &ic_myaddr);
1285
1286 return 0;
1287 }
1288
1289 #endif /* IPCONFIG_DYNAMIC */
1290
1291 #ifdef CONFIG_PROC_FS
1292
1293 static int pnp_seq_show(struct seq_file *seq, void *v)
1294 {
1295 int i;
1296
1297 if (ic_proto_used & IC_PROTO)
1298 seq_printf(seq, "#PROTO: %s\n",
1299 (ic_proto_used & IC_RARP) ? "RARP"
1300 : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP");
1301 else
1302 seq_puts(seq, "#MANUAL\n");
1303
1304 if (ic_domain[0])
1305 seq_printf(seq,
1306 "domain %s\n", ic_domain);
1307 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {
1308 if (ic_nameservers[i] != NONE)
1309 seq_printf(seq, "nameserver %pI4\n",
1310 &ic_nameservers[i]);
1311 }
1312 if (ic_servaddr != NONE)
1313 seq_printf(seq, "bootserver %pI4\n",
1314 &ic_servaddr);
1315 return 0;
1316 }
1317
1318 static int pnp_seq_open(struct inode *indoe, struct file *file)
1319 {
1320 return single_open(file, pnp_seq_show, NULL);
1321 }
1322
1323 static const struct file_operations pnp_seq_fops = {
1324 .owner = THIS_MODULE,
1325 .open = pnp_seq_open,
1326 .read = seq_read,
1327 .llseek = seq_lseek,
1328 .release = single_release,
1329 };
1330 #endif /* CONFIG_PROC_FS */
1331
1332 /*
1333 * Extract IP address from the parameter string if needed. Note that we
1334 * need to have root_server_addr set _before_ IPConfig gets called as it
1335 * can override it.
1336 */
1337 __be32 __init root_nfs_parse_addr(char *name)
1338 {
1339 __be32 addr;
1340 int octets = 0;
1341 char *cp, *cq;
1342
1343 cp = cq = name;
1344 while (octets < 4) {
1345 while (*cp >= '0' && *cp <= '9')
1346 cp++;
1347 if (cp == cq || cp - cq > 3)
1348 break;
1349 if (*cp == '.' || octets == 3)
1350 octets++;
1351 if (octets < 4)
1352 cp++;
1353 cq = cp;
1354 }
1355 if (octets == 4 && (*cp == ':' || *cp == '\0')) {
1356 if (*cp == ':')
1357 *cp++ = '\0';
1358 addr = in_aton(name);
1359 memmove(name, cp, strlen(cp) + 1);
1360 } else
1361 addr = NONE;
1362
1363 return addr;
1364 }
1365
1366 #define DEVICE_WAIT_MAX 12 /* 12 seconds */
1367
1368 static int __init wait_for_devices(void)
1369 {
1370 int i;
1371
1372 for (i = 0; i < DEVICE_WAIT_MAX; i++) {
1373 struct net_device *dev;
1374 int found = 0;
1375
1376 rtnl_lock();
1377 for_each_netdev(&init_net, dev) {
1378 if (ic_is_init_dev(dev)) {
1379 found = 1;
1380 break;
1381 }
1382 }
1383 rtnl_unlock();
1384 if (found)
1385 return 0;
1386 ssleep(1);
1387 }
1388 return -ENODEV;
1389 }
1390
1391 /*
1392 * IP Autoconfig dispatcher.
1393 */
1394
1395 static int __init ip_auto_config(void)
1396 {
1397 __be32 addr;
1398 #ifdef IPCONFIG_DYNAMIC
1399 int retries = CONF_OPEN_RETRIES;
1400 #endif
1401 int err;
1402 unsigned int i;
1403
1404 #ifdef CONFIG_PROC_FS
1405 proc_create("pnp", S_IRUGO, init_net.proc_net, &pnp_seq_fops);
1406 #endif /* CONFIG_PROC_FS */
1407
1408 if (!ic_enable)
1409 return 0;
1410
1411 pr_debug("IP-Config: Entered.\n");
1412 #ifdef IPCONFIG_DYNAMIC
1413 try_try_again:
1414 #endif
1415 /* Wait for devices to appear */
1416 err = wait_for_devices();
1417 if (err)
1418 return err;
1419
1420 /* Setup all network devices */
1421 err = ic_open_devs();
1422 if (err)
1423 return err;
1424
1425 /* Give drivers a chance to settle */
1426 msleep(CONF_POST_OPEN);
1427
1428 /*
1429 * If the config information is insufficient (e.g., our IP address or
1430 * IP address of the boot server is missing or we have multiple network
1431 * interfaces and no default was set), use BOOTP or RARP to get the
1432 * missing values.
1433 */
1434 if (ic_myaddr == NONE ||
1435 #ifdef CONFIG_ROOT_NFS
1436 (root_server_addr == NONE &&
1437 ic_servaddr == NONE &&
1438 ROOT_DEV == Root_NFS) ||
1439 #endif
1440 ic_first_dev->next) {
1441 #ifdef IPCONFIG_DYNAMIC
1442 if (ic_dynamic() < 0) {
1443 ic_close_devs();
1444
1445 /*
1446 * I don't know why, but sometimes the
1447 * eepro100 driver (at least) gets upset and
1448 * doesn't work the first time it's opened.
1449 * But then if you close it and reopen it, it
1450 * works just fine. So we need to try that at
1451 * least once before giving up.
1452 *
1453 * Also, if the root will be NFS-mounted, we
1454 * have nowhere to go if DHCP fails. So we
1455 * just have to keep trying forever.
1456 *
1457 * -- Chip
1458 */
1459 #ifdef CONFIG_ROOT_NFS
1460 if (ROOT_DEV == Root_NFS) {
1461 pr_err("IP-Config: Retrying forever (NFS root)...\n");
1462 goto try_try_again;
1463 }
1464 #endif
1465
1466 if (--retries) {
1467 pr_err("IP-Config: Reopening network devices...\n");
1468 goto try_try_again;
1469 }
1470
1471 /* Oh, well. At least we tried. */
1472 pr_err("IP-Config: Auto-configuration of network failed\n");
1473 return -1;
1474 }
1475 #else /* !DYNAMIC */
1476 pr_err("IP-Config: Incomplete network configuration information\n");
1477 ic_close_devs();
1478 return -1;
1479 #endif /* IPCONFIG_DYNAMIC */
1480 } else {
1481 /* Device selected manually or only one device -> use it */
1482 ic_dev = ic_first_dev;
1483 }
1484
1485 addr = root_nfs_parse_addr(root_server_path);
1486 if (root_server_addr == NONE)
1487 root_server_addr = addr;
1488
1489 /*
1490 * Use defaults wherever applicable.
1491 */
1492 if (ic_defaults() < 0)
1493 return -1;
1494
1495 /*
1496 * Record which protocol was actually used.
1497 */
1498 #ifdef IPCONFIG_DYNAMIC
1499 ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP);
1500 #endif
1501
1502 #ifndef IPCONFIG_SILENT
1503 /*
1504 * Clue in the operator.
1505 */
1506 pr_info("IP-Config: Complete:\n");
1507
1508 pr_info(" device=%s, hwaddr=%*phC, ipaddr=%pI4, mask=%pI4, gw=%pI4\n",
1509 ic_dev->dev->name, ic_dev->dev->addr_len, ic_dev->dev->dev_addr,
1510 &ic_myaddr, &ic_netmask, &ic_gateway);
1511 pr_info(" host=%s, domain=%s, nis-domain=%s\n",
1512 utsname()->nodename, ic_domain, utsname()->domainname);
1513 pr_info(" bootserver=%pI4, rootserver=%pI4, rootpath=%s",
1514 &ic_servaddr, &root_server_addr, root_server_path);
1515 if (ic_dev_mtu)
1516 pr_cont(", mtu=%d", ic_dev_mtu);
1517 for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
1518 if (ic_nameservers[i] != NONE) {
1519 pr_cont(" nameserver%u=%pI4",
1520 i, &ic_nameservers[i]);
1521 break;
1522 }
1523 for (i++; i < CONF_NAMESERVERS_MAX; i++)
1524 if (ic_nameservers[i] != NONE)
1525 pr_cont(", nameserver%u=%pI4", i, &ic_nameservers[i]);
1526 pr_cont("\n");
1527 #endif /* !SILENT */
1528
1529 /*
1530 * Close all network devices except the device we've
1531 * autoconfigured and set up routes.
1532 */
1533 if (ic_setup_if() < 0 || ic_setup_routes() < 0)
1534 err = -1;
1535 else
1536 err = 0;
1537
1538 ic_close_devs();
1539
1540 return err;
1541 }
1542
1543 late_initcall(ip_auto_config);
1544
1545
1546 /*
1547 * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
1548 * command line parameter. See Documentation/filesystems/nfs/nfsroot.txt.
1549 */
1550 static 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 (!strncmp(name, "dhcp", 4)) {
1560 char *client_id;
1561
1562 ic_proto_enabled &= ~IC_RARP;
1563 client_id = strstr(name, "dhcp,");
1564 if (client_id) {
1565 char *v;
1566
1567 client_id = client_id + 5;
1568 v = strchr(client_id, ',');
1569 if (!v)
1570 return 1;
1571 *v = 0;
1572 if (kstrtou8(client_id, 0, dhcp_client_identifier))
1573 pr_debug("DHCP: Invalid client identifier type\n");
1574 strncpy(dhcp_client_identifier + 1, v + 1, 251);
1575 *v = ',';
1576 }
1577 return 1;
1578 }
1579 #endif
1580 #ifdef CONFIG_IP_PNP_BOOTP
1581 else if (!strcmp(name, "bootp")) {
1582 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP);
1583 return 1;
1584 }
1585 #endif
1586 #ifdef CONFIG_IP_PNP_RARP
1587 else if (!strcmp(name, "rarp")) {
1588 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP);
1589 return 1;
1590 }
1591 #endif
1592 #ifdef IPCONFIG_DYNAMIC
1593 else if (!strcmp(name, "both")) {
1594 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */
1595 return 1;
1596 }
1597 #endif
1598 return 0;
1599 }
1600
1601 static int __init ip_auto_config_setup(char *addrs)
1602 {
1603 char *cp, *ip, *dp;
1604 int num = 0;
1605
1606 ic_set_manually = 1;
1607 ic_enable = 1;
1608
1609 /*
1610 * If any dhcp, bootp etc options are set, leave autoconfig on
1611 * and skip the below static IP processing.
1612 */
1613 if (ic_proto_name(addrs))
1614 return 1;
1615
1616 /* If no static IP is given, turn off autoconfig and bail. */
1617 if (*addrs == 0 ||
1618 strcmp(addrs, "off") == 0 ||
1619 strcmp(addrs, "none") == 0) {
1620 ic_enable = 0;
1621 return 1;
1622 }
1623
1624 ic_nameservers_predef();
1625
1626 /* Parse string for static IP assignment. */
1627 ip = addrs;
1628 while (ip && *ip) {
1629 if ((cp = strchr(ip, ':')))
1630 *cp++ = '\0';
1631 if (strlen(ip) > 0) {
1632 pr_debug("IP-Config: Parameter #%d: `%s'\n", num, ip);
1633 switch (num) {
1634 case 0:
1635 if ((ic_myaddr = in_aton(ip)) == ANY)
1636 ic_myaddr = NONE;
1637 break;
1638 case 1:
1639 if ((ic_servaddr = in_aton(ip)) == ANY)
1640 ic_servaddr = NONE;
1641 break;
1642 case 2:
1643 if ((ic_gateway = in_aton(ip)) == ANY)
1644 ic_gateway = NONE;
1645 break;
1646 case 3:
1647 if ((ic_netmask = in_aton(ip)) == ANY)
1648 ic_netmask = NONE;
1649 break;
1650 case 4:
1651 if ((dp = strchr(ip, '.'))) {
1652 *dp++ = '\0';
1653 strlcpy(utsname()->domainname, dp,
1654 sizeof(utsname()->domainname));
1655 }
1656 strlcpy(utsname()->nodename, ip,
1657 sizeof(utsname()->nodename));
1658 ic_host_name_set = 1;
1659 break;
1660 case 5:
1661 strlcpy(user_dev_name, ip, sizeof(user_dev_name));
1662 break;
1663 case 6:
1664 if (ic_proto_name(ip) == 0 &&
1665 ic_myaddr == NONE) {
1666 ic_enable = 0;
1667 }
1668 break;
1669 case 7:
1670 if (CONF_NAMESERVERS_MAX >= 1) {
1671 ic_nameservers[0] = in_aton(ip);
1672 if (ic_nameservers[0] == ANY)
1673 ic_nameservers[0] = NONE;
1674 }
1675 break;
1676 case 8:
1677 if (CONF_NAMESERVERS_MAX >= 2) {
1678 ic_nameservers[1] = in_aton(ip);
1679 if (ic_nameservers[1] == ANY)
1680 ic_nameservers[1] = NONE;
1681 }
1682 break;
1683 }
1684 }
1685 ip = cp;
1686 num++;
1687 }
1688
1689 return 1;
1690 }
1691 __setup("ip=", ip_auto_config_setup);
1692
1693 static int __init nfsaddrs_config_setup(char *addrs)
1694 {
1695 return ip_auto_config_setup(addrs);
1696 }
1697 __setup("nfsaddrs=", nfsaddrs_config_setup);
1698
1699 static int __init vendor_class_identifier_setup(char *addrs)
1700 {
1701 if (strlcpy(vendor_class_identifier, addrs,
1702 sizeof(vendor_class_identifier))
1703 >= sizeof(vendor_class_identifier))
1704 pr_warn("DHCP: vendorclass too long, truncated to \"%s\"\n",
1705 vendor_class_identifier);
1706 return 1;
1707 }
1708 __setup("dhcpclass=", vendor_class_identifier_setup);
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