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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Automatic Configuration of IP -- use DHCP, BOOTP, RARP, or
4 * user-supplied information to configure own IP address and routes.
5 *
6 * Copyright (C) 1996-1998 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
7 *
8 * Derived from network configuration code in fs/nfs/nfsroot.c,
9 * originally Copyright (C) 1995, 1996 Gero Kuhlmann and me.
10 *
11 * BOOTP rewritten to construct and analyse packets itself instead
12 * of misusing the IP layer. num_bugs_causing_wrong_arp_replies--;
13 * -- MJ, December 1998
14 *
15 * Fixed ip_auto_config_setup calling at startup in the new "Linker Magic"
16 * initialization scheme.
17 * - Arnaldo Carvalho de Melo <acme@conectiva.com.br>, 08/11/1999
18 *
19 * DHCP support added. To users this looks like a whole separate
20 * protocol, but we know it's just a bag on the side of BOOTP.
21 * -- Chip Salzenberg <chip@valinux.com>, May 2000
22 *
23 * Ported DHCP support from 2.2.16 to 2.4.0-test4
24 * -- Eric Biederman <ebiederman@lnxi.com>, 30 Aug 2000
25 *
26 * Merged changes from 2.2.19 into 2.4.3
27 * -- Eric Biederman <ebiederman@lnxi.com>, 22 April Aug 2001
28 *
29 * Multiple Nameservers in /proc/net/pnp
30 * -- Josef Siemes <jsiemes@web.de>, Aug 2002
31 *
32 * NTP servers in /proc/net/ipconfig/ntp_servers
33 * -- Chris Novakovic <chris@chrisn.me.uk>, April 2018
34 */
35
36#include <linux/types.h>
37#include <linux/string.h>
38#include <linux/kernel.h>
39#include <linux/jiffies.h>
40#include <linux/random.h>
41#include <linux/init.h>
42#include <linux/utsname.h>
43#include <linux/in.h>
44#include <linux/if.h>
45#include <linux/inet.h>
46#include <linux/inetdevice.h>
47#include <linux/netdevice.h>
48#include <linux/if_arp.h>
49#include <linux/skbuff.h>
50#include <linux/ip.h>
51#include <linux/socket.h>
52#include <linux/route.h>
53#include <linux/udp.h>
54#include <linux/proc_fs.h>
55#include <linux/seq_file.h>
56#include <linux/major.h>
57#include <linux/root_dev.h>
58#include <linux/delay.h>
59#include <linux/nfs_fs.h>
60#include <linux/slab.h>
61#include <linux/export.h>
62#include <net/net_namespace.h>
63#include <net/arp.h>
64#include <net/ip.h>
65#include <net/ipconfig.h>
66#include <net/route.h>
67
68#include <linux/uaccess.h>
69#include <net/checksum.h>
70#include <asm/processor.h>
71
72#if defined(CONFIG_IP_PNP_DHCP)
73#define IPCONFIG_DHCP
74#endif
75#if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_DHCP)
76#define IPCONFIG_BOOTP
77#endif
78#if defined(CONFIG_IP_PNP_RARP)
79#define IPCONFIG_RARP
80#endif
81#if defined(IPCONFIG_BOOTP) || defined(IPCONFIG_RARP)
82#define IPCONFIG_DYNAMIC
83#endif
84
85/* Define the friendly delay before and after opening net devices */
86#define CONF_POST_OPEN 10 /* After opening: 10 msecs */
87
88/* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */
89#define CONF_OPEN_RETRIES 2 /* (Re)open devices twice */
90#define CONF_SEND_RETRIES 6 /* Send six requests per open */
91#define CONF_BASE_TIMEOUT (HZ*2) /* Initial timeout: 2 seconds */
92#define CONF_TIMEOUT_RANDOM (HZ) /* Maximum amount of randomization */
93#define CONF_TIMEOUT_MULT *7/4 /* Rate of timeout growth */
94#define CONF_TIMEOUT_MAX (HZ*30) /* Maximum allowed timeout */
95#define CONF_NAMESERVERS_MAX 3 /* Maximum number of nameservers
96 - '3' from resolv.h */
97#define CONF_NTP_SERVERS_MAX 3 /* Maximum number of NTP servers */
98
99#define NONE cpu_to_be32(INADDR_NONE)
100#define ANY cpu_to_be32(INADDR_ANY)
101
102/* Wait for carrier timeout default in seconds */
103static unsigned int carrier_timeout = 120;
104
105/*
106 * Public IP configuration
107 */
108
109/* This is used by platforms which might be able to set the ipconfig
110 * variables using firmware environment vars. If this is set, it will
111 * ignore such firmware variables.
112 */
113int ic_set_manually __initdata = 0; /* IPconfig parameters set manually */
114
115static int ic_enable __initdata; /* IP config enabled? */
116
117/* Protocol choice */
118int ic_proto_enabled __initdata = 0
119#ifdef IPCONFIG_BOOTP
120 | IC_BOOTP
121#endif
122#ifdef CONFIG_IP_PNP_DHCP
123 | IC_USE_DHCP
124#endif
125#ifdef IPCONFIG_RARP
126 | IC_RARP
127#endif
128 ;
129
130static int ic_host_name_set __initdata; /* Host name set by us? */
131
132__be32 ic_myaddr = NONE; /* My IP address */
133static __be32 ic_netmask = NONE; /* Netmask for local subnet */
134__be32 ic_gateway = NONE; /* Gateway IP address */
135
136#ifdef IPCONFIG_DYNAMIC
137static __be32 ic_addrservaddr = NONE; /* IP Address of the IP addresses'server */
138#endif
139
140__be32 ic_servaddr = NONE; /* Boot server IP address */
141
142__be32 root_server_addr = NONE; /* Address of NFS server */
143u8 root_server_path[256] = { 0, }; /* Path to mount as root */
144
145/* vendor class identifier */
146static char vendor_class_identifier[253] __initdata;
147
148#if defined(CONFIG_IP_PNP_DHCP)
149static char dhcp_client_identifier[253] __initdata;
150#endif
151
152/* Persistent data: */
153
154#ifdef IPCONFIG_DYNAMIC
155static int ic_proto_used; /* Protocol used, if any */
156#else
157#define ic_proto_used 0
158#endif
159static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */
160static __be32 ic_ntp_servers[CONF_NTP_SERVERS_MAX]; /* NTP server IP addresses */
161static u8 ic_domain[64]; /* DNS (not NIS) domain name */
162
163/*
164 * Private state.
165 */
166
167/* Name of user-selected boot device */
168static char user_dev_name[IFNAMSIZ] __initdata = { 0, };
169
170/* Protocols supported by available interfaces */
171static int ic_proto_have_if __initdata;
172
173/* MTU for boot device */
174static int ic_dev_mtu __initdata;
175
176#ifdef IPCONFIG_DYNAMIC
177static DEFINE_SPINLOCK(ic_recv_lock);
178static volatile int ic_got_reply __initdata; /* Proto(s) that replied */
179#endif
180#ifdef IPCONFIG_DHCP
181static int ic_dhcp_msgtype __initdata; /* DHCP msg type received */
182#endif
183
184
185/*
186 * Network devices
187 */
188
189struct ic_device {
190 struct ic_device *next;
191 struct net_device *dev;
192 unsigned short flags;
193 short able;
194 __be32 xid;
195};
196
197static struct ic_device *ic_first_dev __initdata; /* List of open device */
198static struct ic_device *ic_dev __initdata; /* Selected device */
199
200static bool __init ic_is_init_dev(struct net_device *dev)
201{
202 if (dev->flags & IFF_LOOPBACK)
203 return false;
204 return user_dev_name[0] ? !strcmp(dev->name, user_dev_name) :
205 (!(dev->flags & IFF_LOOPBACK) &&
206 (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) &&
207 strncmp(dev->name, "dummy", 5));
208}
209
210static int __init ic_open_devs(void)
211{
212 struct ic_device *d, **last;
213 struct net_device *dev;
214 unsigned short oflags;
215 unsigned long start, next_msg;
216
217 last = &ic_first_dev;
218 rtnl_lock();
219
220 /* bring loopback device up first */
221 for_each_netdev(&init_net, dev) {
222 if (!(dev->flags & IFF_LOOPBACK))
223 continue;
224 if (dev_change_flags(dev, dev->flags | IFF_UP, NULL) < 0)
225 pr_err("IP-Config: Failed to open %s\n", dev->name);
226 }
227
228 for_each_netdev(&init_net, dev) {
229 if (ic_is_init_dev(dev)) {
230 int able = 0;
231 if (dev->mtu >= 364)
232 able |= IC_BOOTP;
233 else
234 pr_warn("DHCP/BOOTP: Ignoring device %s, MTU %d too small\n",
235 dev->name, dev->mtu);
236 if (!(dev->flags & IFF_NOARP))
237 able |= IC_RARP;
238 able &= ic_proto_enabled;
239 if (ic_proto_enabled && !able)
240 continue;
241 oflags = dev->flags;
242 if (dev_change_flags(dev, oflags | IFF_UP, NULL) < 0) {
243 pr_err("IP-Config: Failed to open %s\n",
244 dev->name);
245 continue;
246 }
247 if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) {
248 rtnl_unlock();
249 return -ENOMEM;
250 }
251 d->dev = dev;
252 *last = d;
253 last = &d->next;
254 d->flags = oflags;
255 d->able = able;
256 if (able & IC_BOOTP)
257 get_random_bytes(&d->xid, sizeof(__be32));
258 else
259 d->xid = 0;
260 ic_proto_have_if |= able;
261 pr_debug("IP-Config: %s UP (able=%d, xid=%08x)\n",
262 dev->name, able, d->xid);
263 }
264 }
265 /* Devices with a complex topology like SFP ethernet interfaces needs
266 * the rtnl_lock at init. The carrier wait-loop must therefore run
267 * without holding it.
268 */
269 rtnl_unlock();
270
271 /* no point in waiting if we could not bring up at least one device */
272 if (!ic_first_dev)
273 goto have_carrier;
274
275 /* wait for a carrier on at least one device */
276 start = jiffies;
277 next_msg = start + msecs_to_jiffies(20000);
278 while (time_before(jiffies, start +
279 msecs_to_jiffies(carrier_timeout * 1000))) {
280 int wait, elapsed;
281
282 rtnl_lock();
283 for_each_netdev(&init_net, dev)
284 if (ic_is_init_dev(dev) && netif_carrier_ok(dev)) {
285 rtnl_unlock();
286 goto have_carrier;
287 }
288 rtnl_unlock();
289
290 msleep(1);
291
292 if (time_before(jiffies, next_msg))
293 continue;
294
295 elapsed = jiffies_to_msecs(jiffies - start);
296 wait = (carrier_timeout * 1000 - elapsed + 500) / 1000;
297 pr_info("Waiting up to %d more seconds for network.\n", wait);
298 next_msg = jiffies + msecs_to_jiffies(20000);
299 }
300have_carrier:
301
302 *last = NULL;
303
304 if (!ic_first_dev) {
305 if (user_dev_name[0])
306 pr_err("IP-Config: Device `%s' not found\n",
307 user_dev_name);
308 else
309 pr_err("IP-Config: No network devices available\n");
310 return -ENODEV;
311 }
312 return 0;
313}
314
315/* Close all network interfaces except the one we've autoconfigured, and its
316 * lowers, in case it's a stacked virtual interface.
317 */
318static void __init ic_close_devs(void)
319{
320 struct net_device *selected_dev = ic_dev ? ic_dev->dev : NULL;
321 struct ic_device *d, *next;
322 struct net_device *dev;
323
324 rtnl_lock();
325 next = ic_first_dev;
326 while ((d = next)) {
327 bool bring_down = (d != ic_dev);
328 struct net_device *lower;
329 struct list_head *iter;
330
331 next = d->next;
332 dev = d->dev;
333
334 if (selected_dev) {
335 netdev_for_each_lower_dev(selected_dev, lower, iter) {
336 if (dev == lower) {
337 bring_down = false;
338 break;
339 }
340 }
341 }
342 if (bring_down) {
343 pr_debug("IP-Config: Downing %s\n", dev->name);
344 dev_change_flags(dev, d->flags, NULL);
345 }
346 kfree(d);
347 }
348 rtnl_unlock();
349}
350
351/*
352 * Interface to various network functions.
353 */
354
355static inline void
356set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port)
357{
358 sin->sin_family = AF_INET;
359 sin->sin_addr.s_addr = addr;
360 sin->sin_port = port;
361}
362
363/*
364 * Set up interface addresses and routes.
365 */
366
367static 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 = devinet_ioctl(&init_net, 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 = devinet_ioctl(&init_net, 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 = devinet_ioctl(&init_net, 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 rtnl_lock();
399 if ((err = dev_set_mtu(ic_dev->dev, ic_dev_mtu)) < 0)
400 pr_err("IP-Config: Unable to set interface mtu to %d (%d)\n",
401 ic_dev_mtu, err);
402 rtnl_unlock();
403 }
404 return 0;
405}
406
407static 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 = ip_rt_ioctl(&init_net, 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
438static 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 if (IN_CLASSE(ntohl(ic_myaddr)))
459 ic_netmask = htonl(IN_CLASSE_NET);
460 else {
461 pr_err("IP-Config: Unable to guess netmask for address %pI4\n",
462 &ic_myaddr);
463 return -1;
464 }
465 pr_notice("IP-Config: Guessing netmask %pI4\n",
466 &ic_netmask);
467 }
468
469 return 0;
470}
471
472/*
473 * RARP support.
474 */
475
476#ifdef IPCONFIG_RARP
477
478static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
479
480static struct packet_type rarp_packet_type __initdata = {
481 .type = cpu_to_be16(ETH_P_RARP),
482 .func = ic_rarp_recv,
483};
484
485static inline void __init ic_rarp_init(void)
486{
487 dev_add_pack(&rarp_packet_type);
488}
489
490static inline void __init ic_rarp_cleanup(void)
491{
492 dev_remove_pack(&rarp_packet_type);
493}
494
495/*
496 * Process received RARP packet.
497 */
498static int __init
499ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
500{
501 struct arphdr *rarp;
502 unsigned char *rarp_ptr;
503 __be32 sip, tip;
504 unsigned char *tha; /* t for "target" */
505 struct ic_device *d;
506
507 if (!net_eq(dev_net(dev), &init_net))
508 goto drop;
509
510 skb = skb_share_check(skb, GFP_ATOMIC);
511 if (!skb)
512 return NET_RX_DROP;
513
514 if (!pskb_may_pull(skb, sizeof(struct arphdr)))
515 goto drop;
516
517 /* Basic sanity checks can be done without the lock. */
518 rarp = (struct arphdr *)skb_transport_header(skb);
519
520 /* If this test doesn't pass, it's not IP, or we should
521 * ignore it anyway.
522 */
523 if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd))
524 goto drop;
525
526 /* If it's not a RARP reply, delete it. */
527 if (rarp->ar_op != htons(ARPOP_RREPLY))
528 goto drop;
529
530 /* If it's not Ethernet, delete it. */
531 if (rarp->ar_pro != htons(ETH_P_IP))
532 goto drop;
533
534 if (!pskb_may_pull(skb, arp_hdr_len(dev)))
535 goto drop;
536
537 /* OK, it is all there and looks valid, process... */
538 rarp = (struct arphdr *)skb_transport_header(skb);
539 rarp_ptr = (unsigned char *) (rarp + 1);
540
541 /* One reply at a time, please. */
542 spin_lock(&ic_recv_lock);
543
544 /* If we already have a reply, just drop the packet */
545 if (ic_got_reply)
546 goto drop_unlock;
547
548 /* Find the ic_device that the packet arrived on */
549 d = ic_first_dev;
550 while (d && d->dev != dev)
551 d = d->next;
552 if (!d)
553 goto drop_unlock; /* should never happen */
554
555 /* Extract variable-width fields */
556 rarp_ptr += dev->addr_len;
557 memcpy(&sip, rarp_ptr, 4);
558 rarp_ptr += 4;
559 tha = rarp_ptr;
560 rarp_ptr += dev->addr_len;
561 memcpy(&tip, rarp_ptr, 4);
562
563 /* Discard packets which are not meant for us. */
564 if (memcmp(tha, dev->dev_addr, dev->addr_len))
565 goto drop_unlock;
566
567 /* Discard packets which are not from specified server. */
568 if (ic_servaddr != NONE && ic_servaddr != sip)
569 goto drop_unlock;
570
571 /* We have a winner! */
572 ic_dev = d;
573 if (ic_myaddr == NONE)
574 ic_myaddr = tip;
575 ic_servaddr = sip;
576 ic_addrservaddr = sip;
577 ic_got_reply = IC_RARP;
578
579drop_unlock:
580 /* Show's over. Nothing to see here. */
581 spin_unlock(&ic_recv_lock);
582
583drop:
584 /* Throw the packet out. */
585 kfree_skb(skb);
586 return 0;
587}
588
589
590/*
591 * Send RARP request packet over a single interface.
592 */
593static void __init ic_rarp_send_if(struct ic_device *d)
594{
595 struct net_device *dev = d->dev;
596 arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL,
597 dev->dev_addr, dev->dev_addr);
598}
599#endif
600
601/*
602 * Predefine Nameservers
603 */
604static inline void __init ic_nameservers_predef(void)
605{
606 int i;
607
608 for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
609 ic_nameservers[i] = NONE;
610}
611
612/* Predefine NTP servers */
613static inline void __init ic_ntp_servers_predef(void)
614{
615 int i;
616
617 for (i = 0; i < CONF_NTP_SERVERS_MAX; i++)
618 ic_ntp_servers[i] = NONE;
619}
620
621/*
622 * DHCP/BOOTP support.
623 */
624
625#ifdef IPCONFIG_BOOTP
626
627struct bootp_pkt { /* BOOTP packet format */
628 struct iphdr iph; /* IP header */
629 struct udphdr udph; /* UDP header */
630 u8 op; /* 1=request, 2=reply */
631 u8 htype; /* HW address type */
632 u8 hlen; /* HW address length */
633 u8 hops; /* Used only by gateways */
634 __be32 xid; /* Transaction ID */
635 __be16 secs; /* Seconds since we started */
636 __be16 flags; /* Just what it says */
637 __be32 client_ip; /* Client's IP address if known */
638 __be32 your_ip; /* Assigned IP address */
639 __be32 server_ip; /* (Next, e.g. NFS) Server's IP address */
640 __be32 relay_ip; /* IP address of BOOTP relay */
641 u8 hw_addr[16]; /* Client's HW address */
642 u8 serv_name[64]; /* Server host name */
643 u8 boot_file[128]; /* Name of boot file */
644 u8 exten[312]; /* DHCP options / BOOTP vendor extensions */
645};
646
647/* packet ops */
648#define BOOTP_REQUEST 1
649#define BOOTP_REPLY 2
650
651/* DHCP message types */
652#define DHCPDISCOVER 1
653#define DHCPOFFER 2
654#define DHCPREQUEST 3
655#define DHCPDECLINE 4
656#define DHCPACK 5
657#define DHCPNAK 6
658#define DHCPRELEASE 7
659#define DHCPINFORM 8
660
661static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
662
663static struct packet_type bootp_packet_type __initdata = {
664 .type = cpu_to_be16(ETH_P_IP),
665 .func = ic_bootp_recv,
666};
667
668/* DHCPACK can overwrite DNS if fallback was set upon first BOOTP reply */
669static int ic_nameservers_fallback __initdata;
670
671/*
672 * Initialize DHCP/BOOTP extension fields in the request.
673 */
674
675static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 };
676
677#ifdef IPCONFIG_DHCP
678
679static void __init
680ic_dhcp_init_options(u8 *options, struct ic_device *d)
681{
682 u8 mt = ((ic_servaddr == NONE)
683 ? DHCPDISCOVER : DHCPREQUEST);
684 u8 *e = options;
685 int len;
686
687 pr_debug("DHCP: Sending message type %d (%s)\n", mt, d->dev->name);
688
689 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */
690 e += 4;
691
692 *e++ = 53; /* DHCP message type */
693 *e++ = 1;
694 *e++ = mt;
695
696 if (mt == DHCPREQUEST) {
697 *e++ = 54; /* Server ID (IP address) */
698 *e++ = 4;
699 memcpy(e, &ic_servaddr, 4);
700 e += 4;
701
702 *e++ = 50; /* Requested IP address */
703 *e++ = 4;
704 memcpy(e, &ic_myaddr, 4);
705 e += 4;
706 }
707
708 /* always? */
709 {
710 static const u8 ic_req_params[] = {
711 1, /* Subnet mask */
712 3, /* Default gateway */
713 6, /* DNS server */
714 12, /* Host name */
715 15, /* Domain name */
716 17, /* Boot path */
717 26, /* MTU */
718 40, /* NIS domain name */
719 42, /* NTP servers */
720 };
721
722 *e++ = 55; /* Parameter request list */
723 *e++ = sizeof(ic_req_params);
724 memcpy(e, ic_req_params, sizeof(ic_req_params));
725 e += sizeof(ic_req_params);
726
727 if (ic_host_name_set) {
728 *e++ = 12; /* host-name */
729 len = strlen(utsname()->nodename);
730 *e++ = len;
731 memcpy(e, utsname()->nodename, len);
732 e += len;
733 }
734 if (*vendor_class_identifier) {
735 pr_info("DHCP: sending class identifier \"%s\"\n",
736 vendor_class_identifier);
737 *e++ = 60; /* Class-identifier */
738 len = strlen(vendor_class_identifier);
739 *e++ = len;
740 memcpy(e, vendor_class_identifier, len);
741 e += len;
742 }
743 len = strlen(dhcp_client_identifier + 1);
744 /* the minimum length of identifier is 2, include 1 byte type,
745 * and can not be larger than the length of options
746 */
747 if (len >= 1 && len < 312 - (e - options) - 1) {
748 *e++ = 61;
749 *e++ = len + 1;
750 memcpy(e, dhcp_client_identifier, len + 1);
751 e += len + 1;
752 }
753 }
754
755 *e++ = 255; /* End of the list */
756}
757
758#endif /* IPCONFIG_DHCP */
759
760static void __init ic_bootp_init_ext(u8 *e)
761{
762 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */
763 e += 4;
764 *e++ = 1; /* Subnet mask request */
765 *e++ = 4;
766 e += 4;
767 *e++ = 3; /* Default gateway request */
768 *e++ = 4;
769 e += 4;
770#if CONF_NAMESERVERS_MAX > 0
771 *e++ = 6; /* (DNS) name server request */
772 *e++ = 4 * CONF_NAMESERVERS_MAX;
773 e += 4 * CONF_NAMESERVERS_MAX;
774#endif
775 *e++ = 12; /* Host name request */
776 *e++ = 32;
777 e += 32;
778 *e++ = 40; /* NIS Domain name request */
779 *e++ = 32;
780 e += 32;
781 *e++ = 17; /* Boot path */
782 *e++ = 40;
783 e += 40;
784
785 *e++ = 57; /* set extension buffer size for reply */
786 *e++ = 2;
787 *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */
788 *e++ = 150;
789
790 *e++ = 255; /* End of the list */
791}
792
793
794/*
795 * Initialize the DHCP/BOOTP mechanism.
796 */
797static inline void __init ic_bootp_init(void)
798{
799 /* Re-initialise all name servers and NTP servers to NONE, in case any
800 * were set via the "ip=" or "nfsaddrs=" kernel command line parameters:
801 * any IP addresses specified there will already have been decoded but
802 * are no longer needed
803 */
804 ic_nameservers_predef();
805 ic_ntp_servers_predef();
806
807 dev_add_pack(&bootp_packet_type);
808}
809
810
811/*
812 * DHCP/BOOTP cleanup.
813 */
814static inline void __init ic_bootp_cleanup(void)
815{
816 dev_remove_pack(&bootp_packet_type);
817}
818
819
820/*
821 * Send DHCP/BOOTP request to single interface.
822 */
823static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff)
824{
825 struct net_device *dev = d->dev;
826 struct sk_buff *skb;
827 struct bootp_pkt *b;
828 struct iphdr *h;
829 int hlen = LL_RESERVED_SPACE(dev);
830 int tlen = dev->needed_tailroom;
831
832 /* Allocate packet */
833 skb = alloc_skb(sizeof(struct bootp_pkt) + hlen + tlen + 15,
834 GFP_KERNEL);
835 if (!skb)
836 return;
837 skb_reserve(skb, hlen);
838 b = skb_put_zero(skb, sizeof(struct bootp_pkt));
839
840 /* Construct IP header */
841 skb_reset_network_header(skb);
842 h = ip_hdr(skb);
843 h->version = 4;
844 h->ihl = 5;
845 h->tot_len = htons(sizeof(struct bootp_pkt));
846 h->frag_off = htons(IP_DF);
847 h->ttl = 64;
848 h->protocol = IPPROTO_UDP;
849 h->daddr = htonl(INADDR_BROADCAST);
850 h->check = ip_fast_csum((unsigned char *) h, h->ihl);
851
852 /* Construct UDP header */
853 b->udph.source = htons(68);
854 b->udph.dest = htons(67);
855 b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr));
856 /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */
857
858 /* Construct DHCP/BOOTP header */
859 b->op = BOOTP_REQUEST;
860 if (dev->type < 256) /* check for false types */
861 b->htype = dev->type;
862 else if (dev->type == ARPHRD_FDDI)
863 b->htype = ARPHRD_ETHER;
864 else {
865 pr_warn("Unknown ARP type 0x%04x for device %s\n", dev->type,
866 dev->name);
867 b->htype = dev->type; /* can cause undefined behavior */
868 }
869
870 /* server_ip and your_ip address are both already zero per RFC2131 */
871 b->hlen = dev->addr_len;
872 memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
873 b->secs = htons(jiffies_diff / HZ);
874 b->xid = d->xid;
875
876 /* add DHCP options or BOOTP extensions */
877#ifdef IPCONFIG_DHCP
878 if (ic_proto_enabled & IC_USE_DHCP)
879 ic_dhcp_init_options(b->exten, d);
880 else
881#endif
882 ic_bootp_init_ext(b->exten);
883
884 /* Chain packet down the line... */
885 skb->dev = dev;
886 skb->protocol = htons(ETH_P_IP);
887 if (dev_hard_header(skb, dev, ntohs(skb->protocol),
888 dev->broadcast, dev->dev_addr, skb->len) < 0) {
889 kfree_skb(skb);
890 printk("E");
891 return;
892 }
893
894 if (dev_queue_xmit(skb) < 0)
895 printk("E");
896}
897
898
899/*
900 * Copy BOOTP-supplied string
901 */
902static int __init ic_bootp_string(char *dest, char *src, int len, int max)
903{
904 if (!len)
905 return 0;
906 if (len > max-1)
907 len = max-1;
908 memcpy(dest, src, len);
909 dest[len] = '\0';
910 return 1;
911}
912
913
914/*
915 * Process BOOTP extensions.
916 */
917static void __init ic_do_bootp_ext(u8 *ext)
918{
919 u8 servers;
920 int i;
921 __be16 mtu;
922
923 u8 *c;
924
925 pr_debug("DHCP/BOOTP: Got extension %d:", *ext);
926 for (c=ext+2; c<ext+2+ext[1]; c++)
927 pr_debug(" %02x", *c);
928 pr_debug("\n");
929
930 switch (*ext++) {
931 case 1: /* Subnet mask */
932 if (ic_netmask == NONE)
933 memcpy(&ic_netmask, ext+1, 4);
934 break;
935 case 3: /* Default gateway */
936 if (ic_gateway == NONE)
937 memcpy(&ic_gateway, ext+1, 4);
938 break;
939 case 6: /* DNS server */
940 servers= *ext/4;
941 if (servers > CONF_NAMESERVERS_MAX)
942 servers = CONF_NAMESERVERS_MAX;
943 for (i = 0; i < servers; i++) {
944 if (ic_nameservers[i] == NONE ||
945 ic_nameservers_fallback)
946 memcpy(&ic_nameservers[i], ext+1+4*i, 4);
947 }
948 break;
949 case 12: /* Host name */
950 if (!ic_host_name_set) {
951 ic_bootp_string(utsname()->nodename, ext+1, *ext,
952 __NEW_UTS_LEN);
953 ic_host_name_set = 1;
954 }
955 break;
956 case 15: /* Domain name (DNS) */
957 if (!ic_domain[0])
958 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
959 break;
960 case 17: /* Root path */
961 if (!root_server_path[0])
962 ic_bootp_string(root_server_path, ext+1, *ext,
963 sizeof(root_server_path));
964 break;
965 case 26: /* Interface MTU */
966 memcpy(&mtu, ext+1, sizeof(mtu));
967 ic_dev_mtu = ntohs(mtu);
968 break;
969 case 40: /* NIS Domain name (_not_ DNS) */
970 ic_bootp_string(utsname()->domainname, ext+1, *ext,
971 __NEW_UTS_LEN);
972 break;
973 case 42: /* NTP servers */
974 servers = *ext / 4;
975 if (servers > CONF_NTP_SERVERS_MAX)
976 servers = CONF_NTP_SERVERS_MAX;
977 for (i = 0; i < servers; i++) {
978 if (ic_ntp_servers[i] == NONE)
979 memcpy(&ic_ntp_servers[i], ext+1+4*i, 4);
980 }
981 break;
982 }
983}
984
985
986/*
987 * Receive BOOTP reply.
988 */
989static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
990{
991 struct bootp_pkt *b;
992 struct iphdr *h;
993 struct ic_device *d;
994 int len, ext_len;
995
996 if (!net_eq(dev_net(dev), &init_net))
997 goto drop;
998
999 /* Perform verifications before taking the lock. */
1000 if (skb->pkt_type == PACKET_OTHERHOST)
1001 goto drop;
1002
1003 skb = skb_share_check(skb, GFP_ATOMIC);
1004 if (!skb)
1005 return NET_RX_DROP;
1006
1007 if (!pskb_may_pull(skb,
1008 sizeof(struct iphdr) +
1009 sizeof(struct udphdr)))
1010 goto drop;
1011
1012 b = (struct bootp_pkt *)skb_network_header(skb);
1013 h = &b->iph;
1014
1015 if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP)
1016 goto drop;
1017
1018 /* Fragments are not supported */
1019 if (ip_is_fragment(h)) {
1020 net_err_ratelimited("DHCP/BOOTP: Ignoring fragmented reply\n");
1021 goto drop;
1022 }
1023
1024 if (skb->len < ntohs(h->tot_len))
1025 goto drop;
1026
1027 if (ip_fast_csum((char *) h, h->ihl))
1028 goto drop;
1029
1030 if (b->udph.source != htons(67) || b->udph.dest != htons(68))
1031 goto drop;
1032
1033 if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
1034 goto drop;
1035
1036 len = ntohs(b->udph.len) - sizeof(struct udphdr);
1037 ext_len = len - (sizeof(*b) -
1038 sizeof(struct iphdr) -
1039 sizeof(struct udphdr) -
1040 sizeof(b->exten));
1041 if (ext_len < 0)
1042 goto drop;
1043
1044 /* Ok the front looks good, make sure we can get at the rest. */
1045 if (!pskb_may_pull(skb, skb->len))
1046 goto drop;
1047
1048 b = (struct bootp_pkt *)skb_network_header(skb);
1049 h = &b->iph;
1050
1051 /* One reply at a time, please. */
1052 spin_lock(&ic_recv_lock);
1053
1054 /* If we already have a reply, just drop the packet */
1055 if (ic_got_reply)
1056 goto drop_unlock;
1057
1058 /* Find the ic_device that the packet arrived on */
1059 d = ic_first_dev;
1060 while (d && d->dev != dev)
1061 d = d->next;
1062 if (!d)
1063 goto drop_unlock; /* should never happen */
1064
1065 /* Is it a reply to our BOOTP request? */
1066 if (b->op != BOOTP_REPLY ||
1067 b->xid != d->xid) {
1068 net_err_ratelimited("DHCP/BOOTP: Reply not for us on %s, op[%x] xid[%x]\n",
1069 d->dev->name, b->op, b->xid);
1070 goto drop_unlock;
1071 }
1072
1073 /* Parse extensions */
1074 if (ext_len >= 4 &&
1075 !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */
1076 u8 *end = (u8 *) b + ntohs(b->iph.tot_len);
1077 u8 *ext;
1078
1079#ifdef IPCONFIG_DHCP
1080 if (ic_proto_enabled & IC_USE_DHCP) {
1081 __be32 server_id = NONE;
1082 int mt = 0;
1083
1084 ext = &b->exten[4];
1085 while (ext < end && *ext != 0xff) {
1086 u8 *opt = ext++;
1087 if (*opt == 0) /* Padding */
1088 continue;
1089 ext += *ext + 1;
1090 if (ext >= end)
1091 break;
1092 switch (*opt) {
1093 case 53: /* Message type */
1094 if (opt[1])
1095 mt = opt[2];
1096 break;
1097 case 54: /* Server ID (IP address) */
1098 if (opt[1] >= 4)
1099 memcpy(&server_id, opt + 2, 4);
1100 break;
1101 }
1102 }
1103
1104 pr_debug("DHCP: Got message type %d (%s)\n", mt, d->dev->name);
1105
1106 switch (mt) {
1107 case DHCPOFFER:
1108 /* While in the process of accepting one offer,
1109 * ignore all others.
1110 */
1111 if (ic_myaddr != NONE)
1112 goto drop_unlock;
1113
1114 /* Let's accept that offer. */
1115 ic_myaddr = b->your_ip;
1116 ic_servaddr = server_id;
1117 pr_debug("DHCP: Offered address %pI4 by server %pI4\n",
1118 &ic_myaddr, &b->iph.saddr);
1119 /* The DHCP indicated server address takes
1120 * precedence over the bootp header one if
1121 * they are different.
1122 */
1123 if ((server_id != NONE) &&
1124 (b->server_ip != server_id))
1125 b->server_ip = ic_servaddr;
1126 break;
1127
1128 case DHCPACK:
1129 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0)
1130 goto drop_unlock;
1131
1132 /* Yeah! */
1133 break;
1134
1135 default:
1136 /* Urque. Forget it*/
1137 ic_myaddr = NONE;
1138 ic_servaddr = NONE;
1139 goto drop_unlock;
1140 }
1141
1142 ic_dhcp_msgtype = mt;
1143
1144 }
1145#endif /* IPCONFIG_DHCP */
1146
1147 ext = &b->exten[4];
1148 while (ext < end && *ext != 0xff) {
1149 u8 *opt = ext++;
1150 if (*opt == 0) /* Padding */
1151 continue;
1152 ext += *ext + 1;
1153 if (ext < end)
1154 ic_do_bootp_ext(opt);
1155 }
1156 }
1157
1158 /* We have a winner! */
1159 ic_dev = d;
1160 ic_myaddr = b->your_ip;
1161 ic_servaddr = b->server_ip;
1162 ic_addrservaddr = b->iph.saddr;
1163 if (ic_gateway == NONE && b->relay_ip)
1164 ic_gateway = b->relay_ip;
1165 if (ic_nameservers[0] == NONE) {
1166 ic_nameservers[0] = ic_servaddr;
1167 ic_nameservers_fallback = 1;
1168 }
1169 ic_got_reply = IC_BOOTP;
1170
1171drop_unlock:
1172 /* Show's over. Nothing to see here. */
1173 spin_unlock(&ic_recv_lock);
1174
1175drop:
1176 /* Throw the packet out. */
1177 kfree_skb(skb);
1178
1179 return 0;
1180}
1181
1182
1183#endif
1184
1185
1186/*
1187 * Dynamic IP configuration -- DHCP, BOOTP, RARP.
1188 */
1189
1190#ifdef IPCONFIG_DYNAMIC
1191
1192static int __init ic_dynamic(void)
1193{
1194 int retries;
1195 struct ic_device *d;
1196 unsigned long start_jiffies, timeout, jiff;
1197 int do_bootp = ic_proto_have_if & IC_BOOTP;
1198 int do_rarp = ic_proto_have_if & IC_RARP;
1199
1200 /*
1201 * If none of DHCP/BOOTP/RARP was selected, return with an error.
1202 * This routine gets only called when some pieces of information
1203 * are missing, and without DHCP/BOOTP/RARP we are unable to get it.
1204 */
1205 if (!ic_proto_enabled) {
1206 pr_err("IP-Config: Incomplete network configuration information\n");
1207 return -1;
1208 }
1209
1210#ifdef IPCONFIG_BOOTP
1211 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
1212 pr_err("DHCP/BOOTP: No suitable device found\n");
1213#endif
1214#ifdef IPCONFIG_RARP
1215 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)
1216 pr_err("RARP: No suitable device found\n");
1217#endif
1218
1219 if (!ic_proto_have_if)
1220 /* Error message already printed */
1221 return -1;
1222
1223 /*
1224 * Setup protocols
1225 */
1226#ifdef IPCONFIG_BOOTP
1227 if (do_bootp)
1228 ic_bootp_init();
1229#endif
1230#ifdef IPCONFIG_RARP
1231 if (do_rarp)
1232 ic_rarp_init();
1233#endif
1234
1235 /*
1236 * Send requests and wait, until we get an answer. This loop
1237 * seems to be a terrible waste of CPU time, but actually there is
1238 * only one process running at all, so we don't need to use any
1239 * scheduler functions.
1240 * [Actually we could now, but the nothing else running note still
1241 * applies.. - AC]
1242 */
1243 pr_notice("Sending %s%s%s requests .",
1244 do_bootp
1245 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "",
1246 (do_bootp && do_rarp) ? " and " : "",
1247 do_rarp ? "RARP" : "");
1248
1249 start_jiffies = jiffies;
1250 d = ic_first_dev;
1251 retries = CONF_SEND_RETRIES;
1252 get_random_bytes(&timeout, sizeof(timeout));
1253 timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned int) CONF_TIMEOUT_RANDOM);
1254 for (;;) {
1255#ifdef IPCONFIG_BOOTP
1256 if (do_bootp && (d->able & IC_BOOTP))
1257 ic_bootp_send_if(d, jiffies - start_jiffies);
1258#endif
1259#ifdef IPCONFIG_RARP
1260 if (do_rarp && (d->able & IC_RARP))
1261 ic_rarp_send_if(d);
1262#endif
1263
1264 if (!d->next) {
1265 jiff = jiffies + timeout;
1266 while (time_before(jiffies, jiff) && !ic_got_reply)
1267 schedule_timeout_uninterruptible(1);
1268 }
1269#ifdef IPCONFIG_DHCP
1270 /* DHCP isn't done until we get a DHCPACK. */
1271 if ((ic_got_reply & IC_BOOTP) &&
1272 (ic_proto_enabled & IC_USE_DHCP) &&
1273 ic_dhcp_msgtype != DHCPACK) {
1274 ic_got_reply = 0;
1275 /* continue on device that got the reply */
1276 d = ic_dev;
1277 pr_cont(",");
1278 continue;
1279 }
1280#endif /* IPCONFIG_DHCP */
1281
1282 if (ic_got_reply) {
1283 pr_cont(" OK\n");
1284 break;
1285 }
1286
1287 if ((d = d->next))
1288 continue;
1289
1290 if (! --retries) {
1291 pr_cont(" timed out!\n");
1292 break;
1293 }
1294
1295 d = ic_first_dev;
1296
1297 timeout = timeout CONF_TIMEOUT_MULT;
1298 if (timeout > CONF_TIMEOUT_MAX)
1299 timeout = CONF_TIMEOUT_MAX;
1300
1301 pr_cont(".");
1302 }
1303
1304#ifdef IPCONFIG_BOOTP
1305 if (do_bootp)
1306 ic_bootp_cleanup();
1307#endif
1308#ifdef IPCONFIG_RARP
1309 if (do_rarp)
1310 ic_rarp_cleanup();
1311#endif
1312
1313 if (!ic_got_reply) {
1314 ic_myaddr = NONE;
1315 return -1;
1316 }
1317
1318 pr_info("IP-Config: Got %s answer from %pI4, my address is %pI4\n",
1319 ((ic_got_reply & IC_RARP) ? "RARP"
1320 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),
1321 &ic_addrservaddr, &ic_myaddr);
1322
1323 return 0;
1324}
1325
1326#endif /* IPCONFIG_DYNAMIC */
1327
1328#ifdef CONFIG_PROC_FS
1329/* proc_dir_entry for /proc/net/ipconfig */
1330static struct proc_dir_entry *ipconfig_dir;
1331
1332/* Name servers: */
1333static int pnp_seq_show(struct seq_file *seq, void *v)
1334{
1335 int i;
1336
1337 if (ic_proto_used & IC_PROTO)
1338 seq_printf(seq, "#PROTO: %s\n",
1339 (ic_proto_used & IC_RARP) ? "RARP"
1340 : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP");
1341 else
1342 seq_puts(seq, "#MANUAL\n");
1343
1344 if (ic_domain[0])
1345 seq_printf(seq,
1346 "domain %s\n", ic_domain);
1347 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {
1348 if (ic_nameservers[i] != NONE)
1349 seq_printf(seq, "nameserver %pI4\n",
1350 &ic_nameservers[i]);
1351 }
1352 if (ic_servaddr != NONE)
1353 seq_printf(seq, "bootserver %pI4\n",
1354 &ic_servaddr);
1355 return 0;
1356}
1357
1358/* Create the /proc/net/ipconfig directory */
1359static int __init ipconfig_proc_net_init(void)
1360{
1361 ipconfig_dir = proc_net_mkdir(&init_net, "ipconfig", init_net.proc_net);
1362 if (!ipconfig_dir)
1363 return -ENOMEM;
1364
1365 return 0;
1366}
1367
1368/* Create a new file under /proc/net/ipconfig */
1369static int ipconfig_proc_net_create(const char *name,
1370 const struct proc_ops *proc_ops)
1371{
1372 char *pname;
1373 struct proc_dir_entry *p;
1374
1375 if (!ipconfig_dir)
1376 return -ENOMEM;
1377
1378 pname = kasprintf(GFP_KERNEL, "%s%s", "ipconfig/", name);
1379 if (!pname)
1380 return -ENOMEM;
1381
1382 p = proc_create(pname, 0444, init_net.proc_net, proc_ops);
1383 kfree(pname);
1384 if (!p)
1385 return -ENOMEM;
1386
1387 return 0;
1388}
1389
1390/* Write NTP server IP addresses to /proc/net/ipconfig/ntp_servers */
1391static int ntp_servers_show(struct seq_file *seq, void *v)
1392{
1393 int i;
1394
1395 for (i = 0; i < CONF_NTP_SERVERS_MAX; i++) {
1396 if (ic_ntp_servers[i] != NONE)
1397 seq_printf(seq, "%pI4\n", &ic_ntp_servers[i]);
1398 }
1399 return 0;
1400}
1401DEFINE_PROC_SHOW_ATTRIBUTE(ntp_servers);
1402#endif /* CONFIG_PROC_FS */
1403
1404/*
1405 * Extract IP address from the parameter string if needed. Note that we
1406 * need to have root_server_addr set _before_ IPConfig gets called as it
1407 * can override it.
1408 */
1409__be32 __init root_nfs_parse_addr(char *name)
1410{
1411 __be32 addr;
1412 int octets = 0;
1413 char *cp, *cq;
1414
1415 cp = cq = name;
1416 while (octets < 4) {
1417 while (*cp >= '0' && *cp <= '9')
1418 cp++;
1419 if (cp == cq || cp - cq > 3)
1420 break;
1421 if (*cp == '.' || octets == 3)
1422 octets++;
1423 if (octets < 4)
1424 cp++;
1425 cq = cp;
1426 }
1427 if (octets == 4 && (*cp == ':' || *cp == '\0')) {
1428 if (*cp == ':')
1429 *cp++ = '\0';
1430 addr = in_aton(name);
1431 memmove(name, cp, strlen(cp) + 1);
1432 } else
1433 addr = NONE;
1434
1435 return addr;
1436}
1437
1438#define DEVICE_WAIT_MAX 12 /* 12 seconds */
1439
1440static int __init wait_for_devices(void)
1441{
1442 int i;
1443 bool try_init_devs = true;
1444
1445 for (i = 0; i < DEVICE_WAIT_MAX; i++) {
1446 struct net_device *dev;
1447 int found = 0;
1448
1449 /* make sure deferred device probes are finished */
1450 wait_for_device_probe();
1451
1452 rtnl_lock();
1453 for_each_netdev(&init_net, dev) {
1454 if (ic_is_init_dev(dev)) {
1455 found = 1;
1456 break;
1457 }
1458 }
1459 rtnl_unlock();
1460 if (found)
1461 return 0;
1462 if (try_init_devs &&
1463 (ROOT_DEV == Root_NFS || ROOT_DEV == Root_CIFS)) {
1464 try_init_devs = false;
1465 wait_for_init_devices_probe();
1466 }
1467 ssleep(1);
1468 }
1469 return -ENODEV;
1470}
1471
1472/*
1473 * IP Autoconfig dispatcher.
1474 */
1475
1476static int __init ip_auto_config(void)
1477{
1478 __be32 addr;
1479#ifdef IPCONFIG_DYNAMIC
1480 int retries = CONF_OPEN_RETRIES;
1481#endif
1482 int err;
1483 unsigned int i, count;
1484
1485 /* Initialise all name servers and NTP servers to NONE (but only if the
1486 * "ip=" or "nfsaddrs=" kernel command line parameters weren't decoded,
1487 * otherwise we'll overwrite the IP addresses specified there)
1488 */
1489 if (ic_set_manually == 0) {
1490 ic_nameservers_predef();
1491 ic_ntp_servers_predef();
1492 }
1493
1494#ifdef CONFIG_PROC_FS
1495 proc_create_single("pnp", 0444, init_net.proc_net, pnp_seq_show);
1496
1497 if (ipconfig_proc_net_init() == 0)
1498 ipconfig_proc_net_create("ntp_servers", &ntp_servers_proc_ops);
1499#endif /* CONFIG_PROC_FS */
1500
1501 if (!ic_enable)
1502 return 0;
1503
1504 pr_debug("IP-Config: Entered.\n");
1505#ifdef IPCONFIG_DYNAMIC
1506 try_try_again:
1507#endif
1508 /* Wait for devices to appear */
1509 err = wait_for_devices();
1510 if (err)
1511 return err;
1512
1513 /* Setup all network devices */
1514 err = ic_open_devs();
1515 if (err)
1516 return err;
1517
1518 /* Give drivers a chance to settle */
1519 msleep(CONF_POST_OPEN);
1520
1521 /*
1522 * If the config information is insufficient (e.g., our IP address or
1523 * IP address of the boot server is missing or we have multiple network
1524 * interfaces and no default was set), use BOOTP or RARP to get the
1525 * missing values.
1526 */
1527 if (ic_myaddr == NONE ||
1528#if defined(CONFIG_ROOT_NFS) || defined(CONFIG_CIFS_ROOT)
1529 (root_server_addr == NONE &&
1530 ic_servaddr == NONE &&
1531 (ROOT_DEV == Root_NFS || ROOT_DEV == Root_CIFS)) ||
1532#endif
1533 ic_first_dev->next) {
1534#ifdef IPCONFIG_DYNAMIC
1535 if (ic_dynamic() < 0) {
1536 ic_close_devs();
1537
1538 /*
1539 * I don't know why, but sometimes the
1540 * eepro100 driver (at least) gets upset and
1541 * doesn't work the first time it's opened.
1542 * But then if you close it and reopen it, it
1543 * works just fine. So we need to try that at
1544 * least once before giving up.
1545 *
1546 * Also, if the root will be NFS-mounted, we
1547 * have nowhere to go if DHCP fails. So we
1548 * just have to keep trying forever.
1549 *
1550 * -- Chip
1551 */
1552#ifdef CONFIG_ROOT_NFS
1553 if (ROOT_DEV == Root_NFS) {
1554 pr_err("IP-Config: Retrying forever (NFS root)...\n");
1555 goto try_try_again;
1556 }
1557#endif
1558#ifdef CONFIG_CIFS_ROOT
1559 if (ROOT_DEV == Root_CIFS) {
1560 pr_err("IP-Config: Retrying forever (CIFS root)...\n");
1561 goto try_try_again;
1562 }
1563#endif
1564
1565 if (--retries) {
1566 pr_err("IP-Config: Reopening network devices...\n");
1567 goto try_try_again;
1568 }
1569
1570 /* Oh, well. At least we tried. */
1571 pr_err("IP-Config: Auto-configuration of network failed\n");
1572 return -1;
1573 }
1574#else /* !DYNAMIC */
1575 pr_err("IP-Config: Incomplete network configuration information\n");
1576 ic_close_devs();
1577 return -1;
1578#endif /* IPCONFIG_DYNAMIC */
1579 } else {
1580 /* Device selected manually or only one device -> use it */
1581 ic_dev = ic_first_dev;
1582 }
1583
1584 addr = root_nfs_parse_addr(root_server_path);
1585 if (root_server_addr == NONE)
1586 root_server_addr = addr;
1587
1588 /*
1589 * Use defaults wherever applicable.
1590 */
1591 if (ic_defaults() < 0)
1592 return -1;
1593
1594 /*
1595 * Record which protocol was actually used.
1596 */
1597#ifdef IPCONFIG_DYNAMIC
1598 ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP);
1599#endif
1600
1601#ifndef IPCONFIG_SILENT
1602 /*
1603 * Clue in the operator.
1604 */
1605 pr_info("IP-Config: Complete:\n");
1606
1607 pr_info(" device=%s, hwaddr=%*phC, ipaddr=%pI4, mask=%pI4, gw=%pI4\n",
1608 ic_dev->dev->name, ic_dev->dev->addr_len, ic_dev->dev->dev_addr,
1609 &ic_myaddr, &ic_netmask, &ic_gateway);
1610 pr_info(" host=%s, domain=%s, nis-domain=%s\n",
1611 utsname()->nodename, ic_domain, utsname()->domainname);
1612 pr_info(" bootserver=%pI4, rootserver=%pI4, rootpath=%s",
1613 &ic_servaddr, &root_server_addr, root_server_path);
1614 if (ic_dev_mtu)
1615 pr_cont(", mtu=%d", ic_dev_mtu);
1616 /* Name servers (if any): */
1617 for (i = 0, count = 0; i < CONF_NAMESERVERS_MAX; i++) {
1618 if (ic_nameservers[i] != NONE) {
1619 if (i == 0)
1620 pr_info(" nameserver%u=%pI4",
1621 i, &ic_nameservers[i]);
1622 else
1623 pr_cont(", nameserver%u=%pI4",
1624 i, &ic_nameservers[i]);
1625
1626 count++;
1627 }
1628 if ((i + 1 == CONF_NAMESERVERS_MAX) && count > 0)
1629 pr_cont("\n");
1630 }
1631 /* NTP servers (if any): */
1632 for (i = 0, count = 0; i < CONF_NTP_SERVERS_MAX; i++) {
1633 if (ic_ntp_servers[i] != NONE) {
1634 if (i == 0)
1635 pr_info(" ntpserver%u=%pI4",
1636 i, &ic_ntp_servers[i]);
1637 else
1638 pr_cont(", ntpserver%u=%pI4",
1639 i, &ic_ntp_servers[i]);
1640
1641 count++;
1642 }
1643 if ((i + 1 == CONF_NTP_SERVERS_MAX) && count > 0)
1644 pr_cont("\n");
1645 }
1646#endif /* !SILENT */
1647
1648 /*
1649 * Close all network devices except the device we've
1650 * autoconfigured and set up routes.
1651 */
1652 if (ic_setup_if() < 0 || ic_setup_routes() < 0)
1653 err = -1;
1654 else
1655 err = 0;
1656
1657 ic_close_devs();
1658
1659 return err;
1660}
1661
1662late_initcall(ip_auto_config);
1663
1664
1665/*
1666 * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
1667 * command line parameter. See Documentation/admin-guide/nfs/nfsroot.rst.
1668 */
1669static int __init ic_proto_name(char *name)
1670{
1671 if (!strcmp(name, "on") || !strcmp(name, "any")) {
1672 return 1;
1673 }
1674 if (!strcmp(name, "off") || !strcmp(name, "none")) {
1675 return 0;
1676 }
1677#ifdef CONFIG_IP_PNP_DHCP
1678 else if (!strncmp(name, "dhcp", 4)) {
1679 char *client_id;
1680
1681 ic_proto_enabled &= ~IC_RARP;
1682 client_id = strstr(name, "dhcp,");
1683 if (client_id) {
1684 char *v;
1685
1686 client_id = client_id + 5;
1687 v = strchr(client_id, ',');
1688 if (!v)
1689 return 1;
1690 *v = 0;
1691 if (kstrtou8(client_id, 0, dhcp_client_identifier))
1692 pr_debug("DHCP: Invalid client identifier type\n");
1693 strncpy(dhcp_client_identifier + 1, v + 1, 251);
1694 *v = ',';
1695 }
1696 return 1;
1697 }
1698#endif
1699#ifdef CONFIG_IP_PNP_BOOTP
1700 else if (!strcmp(name, "bootp")) {
1701 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP);
1702 return 1;
1703 }
1704#endif
1705#ifdef CONFIG_IP_PNP_RARP
1706 else if (!strcmp(name, "rarp")) {
1707 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP);
1708 return 1;
1709 }
1710#endif
1711#ifdef IPCONFIG_DYNAMIC
1712 else if (!strcmp(name, "both")) {
1713 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */
1714 return 1;
1715 }
1716#endif
1717 return 0;
1718}
1719
1720static int __init ip_auto_config_setup(char *addrs)
1721{
1722 char *cp, *ip, *dp;
1723 int num = 0;
1724
1725 ic_set_manually = 1;
1726 ic_enable = 1;
1727
1728 /*
1729 * If any dhcp, bootp etc options are set, leave autoconfig on
1730 * and skip the below static IP processing.
1731 */
1732 if (ic_proto_name(addrs))
1733 return 1;
1734
1735 /* If no static IP is given, turn off autoconfig and bail. */
1736 if (*addrs == 0 ||
1737 strcmp(addrs, "off") == 0 ||
1738 strcmp(addrs, "none") == 0) {
1739 ic_enable = 0;
1740 return 1;
1741 }
1742
1743 /* Initialise all name servers and NTP servers to NONE */
1744 ic_nameservers_predef();
1745 ic_ntp_servers_predef();
1746
1747 /* Parse string for static IP assignment. */
1748 ip = addrs;
1749 while (ip && *ip) {
1750 if ((cp = strchr(ip, ':')))
1751 *cp++ = '\0';
1752 if (strlen(ip) > 0) {
1753 pr_debug("IP-Config: Parameter #%d: `%s'\n", num, ip);
1754 switch (num) {
1755 case 0:
1756 if ((ic_myaddr = in_aton(ip)) == ANY)
1757 ic_myaddr = NONE;
1758 break;
1759 case 1:
1760 if ((ic_servaddr = in_aton(ip)) == ANY)
1761 ic_servaddr = NONE;
1762 break;
1763 case 2:
1764 if ((ic_gateway = in_aton(ip)) == ANY)
1765 ic_gateway = NONE;
1766 break;
1767 case 3:
1768 if ((ic_netmask = in_aton(ip)) == ANY)
1769 ic_netmask = NONE;
1770 break;
1771 case 4:
1772 if ((dp = strchr(ip, '.'))) {
1773 *dp++ = '\0';
1774 strscpy(utsname()->domainname, dp,
1775 sizeof(utsname()->domainname));
1776 }
1777 strscpy(utsname()->nodename, ip,
1778 sizeof(utsname()->nodename));
1779 ic_host_name_set = 1;
1780 break;
1781 case 5:
1782 strscpy(user_dev_name, ip, sizeof(user_dev_name));
1783 break;
1784 case 6:
1785 if (ic_proto_name(ip) == 0 &&
1786 ic_myaddr == NONE) {
1787 ic_enable = 0;
1788 }
1789 break;
1790 case 7:
1791 if (CONF_NAMESERVERS_MAX >= 1) {
1792 ic_nameservers[0] = in_aton(ip);
1793 if (ic_nameservers[0] == ANY)
1794 ic_nameservers[0] = NONE;
1795 }
1796 break;
1797 case 8:
1798 if (CONF_NAMESERVERS_MAX >= 2) {
1799 ic_nameservers[1] = in_aton(ip);
1800 if (ic_nameservers[1] == ANY)
1801 ic_nameservers[1] = NONE;
1802 }
1803 break;
1804 case 9:
1805 if (CONF_NTP_SERVERS_MAX >= 1) {
1806 ic_ntp_servers[0] = in_aton(ip);
1807 if (ic_ntp_servers[0] == ANY)
1808 ic_ntp_servers[0] = NONE;
1809 }
1810 break;
1811 }
1812 }
1813 ip = cp;
1814 num++;
1815 }
1816
1817 return 1;
1818}
1819__setup("ip=", ip_auto_config_setup);
1820
1821static int __init nfsaddrs_config_setup(char *addrs)
1822{
1823 return ip_auto_config_setup(addrs);
1824}
1825__setup("nfsaddrs=", nfsaddrs_config_setup);
1826
1827static int __init vendor_class_identifier_setup(char *addrs)
1828{
1829 if (strscpy(vendor_class_identifier, addrs,
1830 sizeof(vendor_class_identifier))
1831 >= sizeof(vendor_class_identifier))
1832 pr_warn("DHCP: vendorclass too long, truncated to \"%s\"\n",
1833 vendor_class_identifier);
1834 return 1;
1835}
1836__setup("dhcpclass=", vendor_class_identifier_setup);
1837
1838static int __init set_carrier_timeout(char *str)
1839{
1840 ssize_t ret;
1841
1842 if (!str)
1843 return 0;
1844
1845 ret = kstrtouint(str, 0, &carrier_timeout);
1846 if (ret)
1847 return 0;
1848
1849 return 1;
1850}
1851__setup("carrier_timeout=", set_carrier_timeout);
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 */
116int ic_set_manually __initdata = 0; /* IPconfig parameters set manually */
117
118static int ic_enable __initdata = 0; /* IP config enabled? */
119
120/* Protocol choice */
121int ic_proto_enabled __initdata = 0
122#ifdef IPCONFIG_BOOTP
123 | IC_BOOTP
124#endif
125#ifdef CONFIG_IP_PNP_DHCP
126 | IC_USE_DHCP
127#endif
128#ifdef IPCONFIG_RARP
129 | IC_RARP
130#endif
131 ;
132
133static int ic_host_name_set __initdata = 0; /* Host name set by us? */
134
135__be32 ic_myaddr = NONE; /* My IP address */
136static __be32 ic_netmask = NONE; /* Netmask for local subnet */
137__be32 ic_gateway = NONE; /* Gateway IP address */
138
139__be32 ic_servaddr = NONE; /* Boot server IP address */
140
141__be32 root_server_addr = NONE; /* Address of NFS server */
142u8 root_server_path[256] = { 0, }; /* Path to mount as root */
143
144__be32 ic_dev_xid; /* Device under configuration */
145
146/* vendor class identifier */
147static char vendor_class_identifier[253] __initdata;
148
149/* Persistent data: */
150
151static int ic_proto_used; /* Protocol used, if any */
152static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */
153static u8 ic_domain[64]; /* DNS (not NIS) domain name */
154
155/*
156 * Private state.
157 */
158
159/* Name of user-selected boot device */
160static char user_dev_name[IFNAMSIZ] __initdata = { 0, };
161
162/* Protocols supported by available interfaces */
163static int ic_proto_have_if __initdata = 0;
164
165/* MTU for boot device */
166static int ic_dev_mtu __initdata = 0;
167
168#ifdef IPCONFIG_DYNAMIC
169static DEFINE_SPINLOCK(ic_recv_lock);
170static volatile int ic_got_reply __initdata = 0; /* Proto(s) that replied */
171#endif
172#ifdef IPCONFIG_DHCP
173static int ic_dhcp_msgtype __initdata = 0; /* DHCP msg type received */
174#endif
175
176
177/*
178 * Network devices
179 */
180
181struct ic_device {
182 struct ic_device *next;
183 struct net_device *dev;
184 unsigned short flags;
185 short able;
186 __be32 xid;
187};
188
189static struct ic_device *ic_first_dev __initdata = NULL;/* List of open device */
190static struct net_device *ic_dev __initdata = NULL; /* Selected device */
191
192static bool __init ic_is_init_dev(struct net_device *dev)
193{
194 if (dev->flags & IFF_LOOPBACK)
195 return false;
196 return user_dev_name[0] ? !strcmp(dev->name, user_dev_name) :
197 (!(dev->flags & IFF_LOOPBACK) &&
198 (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) &&
199 strncmp(dev->name, "dummy", 5));
200}
201
202static int __init ic_open_devs(void)
203{
204 struct ic_device *d, **last;
205 struct net_device *dev;
206 unsigned short oflags;
207 unsigned long start;
208
209 last = &ic_first_dev;
210 rtnl_lock();
211
212 /* bring loopback device up first */
213 for_each_netdev(&init_net, dev) {
214 if (!(dev->flags & IFF_LOOPBACK))
215 continue;
216 if (dev_change_flags(dev, dev->flags | IFF_UP) < 0)
217 pr_err("IP-Config: Failed to open %s\n", dev->name);
218 }
219
220 for_each_netdev(&init_net, dev) {
221 if (ic_is_init_dev(dev)) {
222 int able = 0;
223 if (dev->mtu >= 364)
224 able |= IC_BOOTP;
225 else
226 pr_warn("DHCP/BOOTP: Ignoring device %s, MTU %d too small",
227 dev->name, dev->mtu);
228 if (!(dev->flags & IFF_NOARP))
229 able |= IC_RARP;
230 able &= ic_proto_enabled;
231 if (ic_proto_enabled && !able)
232 continue;
233 oflags = dev->flags;
234 if (dev_change_flags(dev, oflags | IFF_UP) < 0) {
235 pr_err("IP-Config: Failed to open %s\n",
236 dev->name);
237 continue;
238 }
239 if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) {
240 rtnl_unlock();
241 return -ENOMEM;
242 }
243 d->dev = dev;
244 *last = d;
245 last = &d->next;
246 d->flags = oflags;
247 d->able = able;
248 if (able & IC_BOOTP)
249 get_random_bytes(&d->xid, sizeof(__be32));
250 else
251 d->xid = 0;
252 ic_proto_have_if |= able;
253 DBG(("IP-Config: %s UP (able=%d, xid=%08x)\n",
254 dev->name, able, d->xid));
255 }
256 }
257
258 /* 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 while (jiffies - start < msecs_to_jiffies(CONF_CARRIER_TIMEOUT)) {
265 for_each_netdev(&init_net, dev)
266 if (ic_is_init_dev(dev) && netif_carrier_ok(dev))
267 goto have_carrier;
268
269 msleep(1);
270 }
271have_carrier:
272 rtnl_unlock();
273
274 *last = NULL;
275
276 if (!ic_first_dev) {
277 if (user_dev_name[0])
278 pr_err("IP-Config: Device `%s' not found\n",
279 user_dev_name);
280 else
281 pr_err("IP-Config: No network devices available\n");
282 return -ENODEV;
283 }
284 return 0;
285}
286
287static void __init ic_close_devs(void)
288{
289 struct ic_device *d, *next;
290 struct net_device *dev;
291
292 rtnl_lock();
293 next = ic_first_dev;
294 while ((d = next)) {
295 next = d->next;
296 dev = d->dev;
297 if (dev != ic_dev) {
298 DBG(("IP-Config: Downing %s\n", dev->name));
299 dev_change_flags(dev, d->flags);
300 }
301 kfree(d);
302 }
303 rtnl_unlock();
304}
305
306/*
307 * Interface to various network functions.
308 */
309
310static inline void
311set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port)
312{
313 sin->sin_family = AF_INET;
314 sin->sin_addr.s_addr = addr;
315 sin->sin_port = port;
316}
317
318static int __init ic_devinet_ioctl(unsigned int cmd, struct ifreq *arg)
319{
320 int res;
321
322 mm_segment_t oldfs = get_fs();
323 set_fs(get_ds());
324 res = devinet_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
325 set_fs(oldfs);
326 return res;
327}
328
329static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg)
330{
331 int res;
332
333 mm_segment_t oldfs = get_fs();
334 set_fs(get_ds());
335 res = dev_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
336 set_fs(oldfs);
337 return res;
338}
339
340static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg)
341{
342 int res;
343
344 mm_segment_t oldfs = get_fs();
345 set_fs(get_ds());
346 res = ip_rt_ioctl(&init_net, cmd, (void __user *) arg);
347 set_fs(oldfs);
348 return res;
349}
350
351/*
352 * Set up interface addresses and routes.
353 */
354
355static int __init ic_setup_if(void)
356{
357 struct ifreq ir;
358 struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr;
359 int err;
360
361 memset(&ir, 0, sizeof(ir));
362 strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name);
363 set_sockaddr(sin, ic_myaddr, 0);
364 if ((err = ic_devinet_ioctl(SIOCSIFADDR, &ir)) < 0) {
365 pr_err("IP-Config: Unable to set interface address (%d)\n",
366 err);
367 return -1;
368 }
369 set_sockaddr(sin, ic_netmask, 0);
370 if ((err = ic_devinet_ioctl(SIOCSIFNETMASK, &ir)) < 0) {
371 pr_err("IP-Config: Unable to set interface netmask (%d)\n",
372 err);
373 return -1;
374 }
375 set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0);
376 if ((err = ic_devinet_ioctl(SIOCSIFBRDADDR, &ir)) < 0) {
377 pr_err("IP-Config: Unable to set interface broadcast address (%d)\n",
378 err);
379 return -1;
380 }
381 /* Handle the case where we need non-standard MTU on the boot link (a network
382 * using jumbo frames, for instance). If we can't set the mtu, don't error
383 * out, we'll try to muddle along.
384 */
385 if (ic_dev_mtu != 0) {
386 strcpy(ir.ifr_name, ic_dev->name);
387 ir.ifr_mtu = ic_dev_mtu;
388 if ((err = ic_dev_ioctl(SIOCSIFMTU, &ir)) < 0)
389 pr_err("IP-Config: Unable to set interface mtu to %d (%d)\n",
390 ic_dev_mtu, err);
391 }
392 return 0;
393}
394
395static int __init ic_setup_routes(void)
396{
397 /* No need to setup device routes, only the default route... */
398
399 if (ic_gateway != NONE) {
400 struct rtentry rm;
401 int err;
402
403 memset(&rm, 0, sizeof(rm));
404 if ((ic_gateway ^ ic_myaddr) & ic_netmask) {
405 pr_err("IP-Config: Gateway not on directly connected network\n");
406 return -1;
407 }
408 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0);
409 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0);
410 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0);
411 rm.rt_flags = RTF_UP | RTF_GATEWAY;
412 if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) {
413 pr_err("IP-Config: Cannot add default route (%d)\n",
414 err);
415 return -1;
416 }
417 }
418
419 return 0;
420}
421
422/*
423 * Fill in default values for all missing parameters.
424 */
425
426static int __init ic_defaults(void)
427{
428 /*
429 * At this point we have no userspace running so need not
430 * claim locks on system_utsname
431 */
432
433 if (!ic_host_name_set)
434 sprintf(init_utsname()->nodename, "%pI4", &ic_myaddr);
435
436 if (root_server_addr == NONE)
437 root_server_addr = ic_servaddr;
438
439 if (ic_netmask == NONE) {
440 if (IN_CLASSA(ntohl(ic_myaddr)))
441 ic_netmask = htonl(IN_CLASSA_NET);
442 else if (IN_CLASSB(ntohl(ic_myaddr)))
443 ic_netmask = htonl(IN_CLASSB_NET);
444 else if (IN_CLASSC(ntohl(ic_myaddr)))
445 ic_netmask = htonl(IN_CLASSC_NET);
446 else {
447 pr_err("IP-Config: Unable to guess netmask for address %pI4\n",
448 &ic_myaddr);
449 return -1;
450 }
451 printk("IP-Config: Guessing netmask %pI4\n", &ic_netmask);
452 }
453
454 return 0;
455}
456
457/*
458 * RARP support.
459 */
460
461#ifdef IPCONFIG_RARP
462
463static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
464
465static struct packet_type rarp_packet_type __initdata = {
466 .type = cpu_to_be16(ETH_P_RARP),
467 .func = ic_rarp_recv,
468};
469
470static inline void __init ic_rarp_init(void)
471{
472 dev_add_pack(&rarp_packet_type);
473}
474
475static inline void __init ic_rarp_cleanup(void)
476{
477 dev_remove_pack(&rarp_packet_type);
478}
479
480/*
481 * Process received RARP packet.
482 */
483static int __init
484ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
485{
486 struct arphdr *rarp;
487 unsigned char *rarp_ptr;
488 __be32 sip, tip;
489 unsigned char *sha, *tha; /* s for "source", t for "target" */
490 struct ic_device *d;
491
492 if (!net_eq(dev_net(dev), &init_net))
493 goto drop;
494
495 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
496 return NET_RX_DROP;
497
498 if (!pskb_may_pull(skb, sizeof(struct arphdr)))
499 goto drop;
500
501 /* Basic sanity checks can be done without the lock. */
502 rarp = (struct arphdr *)skb_transport_header(skb);
503
504 /* If this test doesn't pass, it's not IP, or we should
505 * ignore it anyway.
506 */
507 if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd))
508 goto drop;
509
510 /* If it's not a RARP reply, delete it. */
511 if (rarp->ar_op != htons(ARPOP_RREPLY))
512 goto drop;
513
514 /* If it's not Ethernet, delete it. */
515 if (rarp->ar_pro != htons(ETH_P_IP))
516 goto drop;
517
518 if (!pskb_may_pull(skb, arp_hdr_len(dev)))
519 goto drop;
520
521 /* OK, it is all there and looks valid, process... */
522 rarp = (struct arphdr *)skb_transport_header(skb);
523 rarp_ptr = (unsigned char *) (rarp + 1);
524
525 /* One reply at a time, please. */
526 spin_lock(&ic_recv_lock);
527
528 /* If we already have a reply, just drop the packet */
529 if (ic_got_reply)
530 goto drop_unlock;
531
532 /* Find the ic_device that the packet arrived on */
533 d = ic_first_dev;
534 while (d && d->dev != dev)
535 d = d->next;
536 if (!d)
537 goto drop_unlock; /* should never happen */
538
539 /* Extract variable-width fields */
540 sha = rarp_ptr;
541 rarp_ptr += dev->addr_len;
542 memcpy(&sip, rarp_ptr, 4);
543 rarp_ptr += 4;
544 tha = rarp_ptr;
545 rarp_ptr += dev->addr_len;
546 memcpy(&tip, rarp_ptr, 4);
547
548 /* Discard packets which are not meant for us. */
549 if (memcmp(tha, dev->dev_addr, dev->addr_len))
550 goto drop_unlock;
551
552 /* Discard packets which are not from specified server. */
553 if (ic_servaddr != NONE && ic_servaddr != sip)
554 goto drop_unlock;
555
556 /* We have a winner! */
557 ic_dev = dev;
558 if (ic_myaddr == NONE)
559 ic_myaddr = tip;
560 ic_servaddr = sip;
561 ic_got_reply = IC_RARP;
562
563drop_unlock:
564 /* Show's over. Nothing to see here. */
565 spin_unlock(&ic_recv_lock);
566
567drop:
568 /* Throw the packet out. */
569 kfree_skb(skb);
570 return 0;
571}
572
573
574/*
575 * Send RARP request packet over a single interface.
576 */
577static void __init ic_rarp_send_if(struct ic_device *d)
578{
579 struct net_device *dev = d->dev;
580 arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL,
581 dev->dev_addr, dev->dev_addr);
582}
583#endif
584
585/*
586 * DHCP/BOOTP support.
587 */
588
589#ifdef IPCONFIG_BOOTP
590
591struct bootp_pkt { /* BOOTP packet format */
592 struct iphdr iph; /* IP header */
593 struct udphdr udph; /* UDP header */
594 u8 op; /* 1=request, 2=reply */
595 u8 htype; /* HW address type */
596 u8 hlen; /* HW address length */
597 u8 hops; /* Used only by gateways */
598 __be32 xid; /* Transaction ID */
599 __be16 secs; /* Seconds since we started */
600 __be16 flags; /* Just what it says */
601 __be32 client_ip; /* Client's IP address if known */
602 __be32 your_ip; /* Assigned IP address */
603 __be32 server_ip; /* (Next, e.g. NFS) Server's IP address */
604 __be32 relay_ip; /* IP address of BOOTP relay */
605 u8 hw_addr[16]; /* Client's HW address */
606 u8 serv_name[64]; /* Server host name */
607 u8 boot_file[128]; /* Name of boot file */
608 u8 exten[312]; /* DHCP options / BOOTP vendor extensions */
609};
610
611/* packet ops */
612#define BOOTP_REQUEST 1
613#define BOOTP_REPLY 2
614
615/* DHCP message types */
616#define DHCPDISCOVER 1
617#define DHCPOFFER 2
618#define DHCPREQUEST 3
619#define DHCPDECLINE 4
620#define DHCPACK 5
621#define DHCPNAK 6
622#define DHCPRELEASE 7
623#define DHCPINFORM 8
624
625static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
626
627static struct packet_type bootp_packet_type __initdata = {
628 .type = cpu_to_be16(ETH_P_IP),
629 .func = ic_bootp_recv,
630};
631
632
633/*
634 * Initialize DHCP/BOOTP extension fields in the request.
635 */
636
637static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 };
638
639#ifdef IPCONFIG_DHCP
640
641static void __init
642ic_dhcp_init_options(u8 *options)
643{
644 u8 mt = ((ic_servaddr == NONE)
645 ? DHCPDISCOVER : DHCPREQUEST);
646 u8 *e = options;
647 int len;
648
649#ifdef IPCONFIG_DEBUG
650 printk("DHCP: Sending message type %d\n", mt);
651#endif
652
653 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */
654 e += 4;
655
656 *e++ = 53; /* DHCP message type */
657 *e++ = 1;
658 *e++ = mt;
659
660 if (mt == DHCPREQUEST) {
661 *e++ = 54; /* Server ID (IP address) */
662 *e++ = 4;
663 memcpy(e, &ic_servaddr, 4);
664 e += 4;
665
666 *e++ = 50; /* Requested IP address */
667 *e++ = 4;
668 memcpy(e, &ic_myaddr, 4);
669 e += 4;
670 }
671
672 /* always? */
673 {
674 static const u8 ic_req_params[] = {
675 1, /* Subnet mask */
676 3, /* Default gateway */
677 6, /* DNS server */
678 12, /* Host name */
679 15, /* Domain name */
680 17, /* Boot path */
681 26, /* MTU */
682 40, /* NIS domain name */
683 };
684
685 *e++ = 55; /* Parameter request list */
686 *e++ = sizeof(ic_req_params);
687 memcpy(e, ic_req_params, sizeof(ic_req_params));
688 e += sizeof(ic_req_params);
689
690 if (ic_host_name_set) {
691 *e++ = 12; /* host-name */
692 len = strlen(utsname()->nodename);
693 *e++ = len;
694 memcpy(e, utsname()->nodename, len);
695 e += len;
696 }
697 if (*vendor_class_identifier) {
698 pr_info("DHCP: sending class identifier \"%s\"\n",
699 vendor_class_identifier);
700 *e++ = 60; /* Class-identifier */
701 len = strlen(vendor_class_identifier);
702 *e++ = len;
703 memcpy(e, vendor_class_identifier, len);
704 e += len;
705 }
706 }
707
708 *e++ = 255; /* End of the list */
709}
710
711#endif /* IPCONFIG_DHCP */
712
713static void __init ic_bootp_init_ext(u8 *e)
714{
715 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */
716 e += 4;
717 *e++ = 1; /* Subnet mask request */
718 *e++ = 4;
719 e += 4;
720 *e++ = 3; /* Default gateway request */
721 *e++ = 4;
722 e += 4;
723 *e++ = 5; /* Name server request */
724 *e++ = 8;
725 e += 8;
726 *e++ = 12; /* Host name request */
727 *e++ = 32;
728 e += 32;
729 *e++ = 40; /* NIS Domain name request */
730 *e++ = 32;
731 e += 32;
732 *e++ = 17; /* Boot path */
733 *e++ = 40;
734 e += 40;
735
736 *e++ = 57; /* set extension buffer size for reply */
737 *e++ = 2;
738 *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */
739 *e++ = 150;
740
741 *e++ = 255; /* End of the list */
742}
743
744
745/*
746 * Initialize the DHCP/BOOTP mechanism.
747 */
748static inline void __init ic_bootp_init(void)
749{
750 int i;
751
752 for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
753 ic_nameservers[i] = NONE;
754
755 dev_add_pack(&bootp_packet_type);
756}
757
758
759/*
760 * DHCP/BOOTP cleanup.
761 */
762static inline void __init ic_bootp_cleanup(void)
763{
764 dev_remove_pack(&bootp_packet_type);
765}
766
767
768/*
769 * Send DHCP/BOOTP request to single interface.
770 */
771static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff)
772{
773 struct net_device *dev = d->dev;
774 struct sk_buff *skb;
775 struct bootp_pkt *b;
776 struct iphdr *h;
777 int hlen = LL_RESERVED_SPACE(dev);
778 int tlen = dev->needed_tailroom;
779
780 /* Allocate packet */
781 skb = alloc_skb(sizeof(struct bootp_pkt) + hlen + tlen + 15,
782 GFP_KERNEL);
783 if (!skb)
784 return;
785 skb_reserve(skb, hlen);
786 b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt));
787 memset(b, 0, sizeof(struct bootp_pkt));
788
789 /* Construct IP header */
790 skb_reset_network_header(skb);
791 h = ip_hdr(skb);
792 h->version = 4;
793 h->ihl = 5;
794 h->tot_len = htons(sizeof(struct bootp_pkt));
795 h->frag_off = htons(IP_DF);
796 h->ttl = 64;
797 h->protocol = IPPROTO_UDP;
798 h->daddr = htonl(INADDR_BROADCAST);
799 h->check = ip_fast_csum((unsigned char *) h, h->ihl);
800
801 /* Construct UDP header */
802 b->udph.source = htons(68);
803 b->udph.dest = htons(67);
804 b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr));
805 /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */
806
807 /* Construct DHCP/BOOTP header */
808 b->op = BOOTP_REQUEST;
809 if (dev->type < 256) /* check for false types */
810 b->htype = dev->type;
811 else if (dev->type == ARPHRD_FDDI)
812 b->htype = ARPHRD_ETHER;
813 else {
814 printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name);
815 b->htype = dev->type; /* can cause undefined behavior */
816 }
817
818 /* server_ip and your_ip address are both already zero per RFC2131 */
819 b->hlen = dev->addr_len;
820 memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
821 b->secs = htons(jiffies_diff / HZ);
822 b->xid = d->xid;
823
824 /* add DHCP options or BOOTP extensions */
825#ifdef IPCONFIG_DHCP
826 if (ic_proto_enabled & IC_USE_DHCP)
827 ic_dhcp_init_options(b->exten);
828 else
829#endif
830 ic_bootp_init_ext(b->exten);
831
832 /* Chain packet down the line... */
833 skb->dev = dev;
834 skb->protocol = htons(ETH_P_IP);
835 if (dev_hard_header(skb, dev, ntohs(skb->protocol),
836 dev->broadcast, dev->dev_addr, skb->len) < 0) {
837 kfree_skb(skb);
838 printk("E");
839 return;
840 }
841
842 if (dev_queue_xmit(skb) < 0)
843 printk("E");
844}
845
846
847/*
848 * Copy BOOTP-supplied string if not already set.
849 */
850static int __init ic_bootp_string(char *dest, char *src, int len, int max)
851{
852 if (!len)
853 return 0;
854 if (len > max-1)
855 len = max-1;
856 memcpy(dest, src, len);
857 dest[len] = '\0';
858 return 1;
859}
860
861
862/*
863 * Process BOOTP extensions.
864 */
865static void __init ic_do_bootp_ext(u8 *ext)
866{
867 u8 servers;
868 int i;
869 __be16 mtu;
870
871#ifdef IPCONFIG_DEBUG
872 u8 *c;
873
874 printk("DHCP/BOOTP: Got extension %d:",*ext);
875 for (c=ext+2; c<ext+2+ext[1]; c++)
876 printk(" %02x", *c);
877 printk("\n");
878#endif
879
880 switch (*ext++) {
881 case 1: /* Subnet mask */
882 if (ic_netmask == NONE)
883 memcpy(&ic_netmask, ext+1, 4);
884 break;
885 case 3: /* Default gateway */
886 if (ic_gateway == NONE)
887 memcpy(&ic_gateway, ext+1, 4);
888 break;
889 case 6: /* DNS server */
890 servers= *ext/4;
891 if (servers > CONF_NAMESERVERS_MAX)
892 servers = CONF_NAMESERVERS_MAX;
893 for (i = 0; i < servers; i++) {
894 if (ic_nameservers[i] == NONE)
895 memcpy(&ic_nameservers[i], ext+1+4*i, 4);
896 }
897 break;
898 case 12: /* Host name */
899 ic_bootp_string(utsname()->nodename, ext+1, *ext,
900 __NEW_UTS_LEN);
901 ic_host_name_set = 1;
902 break;
903 case 15: /* Domain name (DNS) */
904 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
905 break;
906 case 17: /* Root path */
907 if (!root_server_path[0])
908 ic_bootp_string(root_server_path, ext+1, *ext,
909 sizeof(root_server_path));
910 break;
911 case 26: /* Interface MTU */
912 memcpy(&mtu, ext+1, sizeof(mtu));
913 ic_dev_mtu = ntohs(mtu);
914 break;
915 case 40: /* NIS Domain name (_not_ DNS) */
916 ic_bootp_string(utsname()->domainname, ext+1, *ext,
917 __NEW_UTS_LEN);
918 break;
919 }
920}
921
922
923/*
924 * Receive BOOTP reply.
925 */
926static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
927{
928 struct bootp_pkt *b;
929 struct iphdr *h;
930 struct ic_device *d;
931 int len, ext_len;
932
933 if (!net_eq(dev_net(dev), &init_net))
934 goto drop;
935
936 /* Perform verifications before taking the lock. */
937 if (skb->pkt_type == PACKET_OTHERHOST)
938 goto drop;
939
940 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
941 return NET_RX_DROP;
942
943 if (!pskb_may_pull(skb,
944 sizeof(struct iphdr) +
945 sizeof(struct udphdr)))
946 goto drop;
947
948 b = (struct bootp_pkt *)skb_network_header(skb);
949 h = &b->iph;
950
951 if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP)
952 goto drop;
953
954 /* Fragments are not supported */
955 if (ip_is_fragment(h)) {
956 net_err_ratelimited("DHCP/BOOTP: Ignoring fragmented reply\n");
957 goto drop;
958 }
959
960 if (skb->len < ntohs(h->tot_len))
961 goto drop;
962
963 if (ip_fast_csum((char *) h, h->ihl))
964 goto drop;
965
966 if (b->udph.source != htons(67) || b->udph.dest != htons(68))
967 goto drop;
968
969 if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
970 goto drop;
971
972 len = ntohs(b->udph.len) - sizeof(struct udphdr);
973 ext_len = len - (sizeof(*b) -
974 sizeof(struct iphdr) -
975 sizeof(struct udphdr) -
976 sizeof(b->exten));
977 if (ext_len < 0)
978 goto drop;
979
980 /* Ok the front looks good, make sure we can get at the rest. */
981 if (!pskb_may_pull(skb, skb->len))
982 goto drop;
983
984 b = (struct bootp_pkt *)skb_network_header(skb);
985 h = &b->iph;
986
987 /* One reply at a time, please. */
988 spin_lock(&ic_recv_lock);
989
990 /* If we already have a reply, just drop the packet */
991 if (ic_got_reply)
992 goto drop_unlock;
993
994 /* Find the ic_device that the packet arrived on */
995 d = ic_first_dev;
996 while (d && d->dev != dev)
997 d = d->next;
998 if (!d)
999 goto drop_unlock; /* should never happen */
1000
1001 /* Is it a reply to our BOOTP request? */
1002 if (b->op != BOOTP_REPLY ||
1003 b->xid != d->xid) {
1004 net_err_ratelimited("DHCP/BOOTP: Reply not for us, op[%x] xid[%x]\n",
1005 b->op, b->xid);
1006 goto drop_unlock;
1007 }
1008
1009 /* Is it a reply for the device we are configuring? */
1010 if (b->xid != ic_dev_xid) {
1011 net_err_ratelimited("DHCP/BOOTP: Ignoring delayed packet\n");
1012 goto drop_unlock;
1013 }
1014
1015 /* Parse extensions */
1016 if (ext_len >= 4 &&
1017 !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */
1018 u8 *end = (u8 *) b + ntohs(b->iph.tot_len);
1019 u8 *ext;
1020
1021#ifdef IPCONFIG_DHCP
1022 if (ic_proto_enabled & IC_USE_DHCP) {
1023 __be32 server_id = NONE;
1024 int mt = 0;
1025
1026 ext = &b->exten[4];
1027 while (ext < end && *ext != 0xff) {
1028 u8 *opt = ext++;
1029 if (*opt == 0) /* Padding */
1030 continue;
1031 ext += *ext + 1;
1032 if (ext >= end)
1033 break;
1034 switch (*opt) {
1035 case 53: /* Message type */
1036 if (opt[1])
1037 mt = opt[2];
1038 break;
1039 case 54: /* Server ID (IP address) */
1040 if (opt[1] >= 4)
1041 memcpy(&server_id, opt + 2, 4);
1042 break;
1043 }
1044 }
1045
1046#ifdef IPCONFIG_DEBUG
1047 printk("DHCP: Got message type %d\n", mt);
1048#endif
1049
1050 switch (mt) {
1051 case DHCPOFFER:
1052 /* While in the process of accepting one offer,
1053 * ignore all others.
1054 */
1055 if (ic_myaddr != NONE)
1056 goto drop_unlock;
1057
1058 /* Let's accept that offer. */
1059 ic_myaddr = b->your_ip;
1060 ic_servaddr = server_id;
1061#ifdef IPCONFIG_DEBUG
1062 printk("DHCP: Offered address %pI4 by server %pI4\n",
1063 &ic_myaddr, &ic_servaddr);
1064#endif
1065 /* The DHCP indicated server address takes
1066 * precedence over the bootp header one if
1067 * they are different.
1068 */
1069 if ((server_id != NONE) &&
1070 (b->server_ip != server_id))
1071 b->server_ip = ic_servaddr;
1072 break;
1073
1074 case DHCPACK:
1075 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0)
1076 goto drop_unlock;
1077
1078 /* Yeah! */
1079 break;
1080
1081 default:
1082 /* Urque. Forget it*/
1083 ic_myaddr = NONE;
1084 ic_servaddr = NONE;
1085 goto drop_unlock;
1086 }
1087
1088 ic_dhcp_msgtype = mt;
1089
1090 }
1091#endif /* IPCONFIG_DHCP */
1092
1093 ext = &b->exten[4];
1094 while (ext < end && *ext != 0xff) {
1095 u8 *opt = ext++;
1096 if (*opt == 0) /* Padding */
1097 continue;
1098 ext += *ext + 1;
1099 if (ext < end)
1100 ic_do_bootp_ext(opt);
1101 }
1102 }
1103
1104 /* We have a winner! */
1105 ic_dev = dev;
1106 ic_myaddr = b->your_ip;
1107 ic_servaddr = b->server_ip;
1108 if (ic_gateway == NONE && b->relay_ip)
1109 ic_gateway = b->relay_ip;
1110 if (ic_nameservers[0] == NONE)
1111 ic_nameservers[0] = ic_servaddr;
1112 ic_got_reply = IC_BOOTP;
1113
1114drop_unlock:
1115 /* Show's over. Nothing to see here. */
1116 spin_unlock(&ic_recv_lock);
1117
1118drop:
1119 /* Throw the packet out. */
1120 kfree_skb(skb);
1121
1122 return 0;
1123}
1124
1125
1126#endif
1127
1128
1129/*
1130 * Dynamic IP configuration -- DHCP, BOOTP, RARP.
1131 */
1132
1133#ifdef IPCONFIG_DYNAMIC
1134
1135static int __init ic_dynamic(void)
1136{
1137 int retries;
1138 struct ic_device *d;
1139 unsigned long start_jiffies, timeout, jiff;
1140 int do_bootp = ic_proto_have_if & IC_BOOTP;
1141 int do_rarp = ic_proto_have_if & IC_RARP;
1142
1143 /*
1144 * If none of DHCP/BOOTP/RARP was selected, return with an error.
1145 * This routine gets only called when some pieces of information
1146 * are missing, and without DHCP/BOOTP/RARP we are unable to get it.
1147 */
1148 if (!ic_proto_enabled) {
1149 pr_err("IP-Config: Incomplete network configuration information\n");
1150 return -1;
1151 }
1152
1153#ifdef IPCONFIG_BOOTP
1154 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
1155 pr_err("DHCP/BOOTP: No suitable device found\n");
1156#endif
1157#ifdef IPCONFIG_RARP
1158 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)
1159 pr_err("RARP: No suitable device found\n");
1160#endif
1161
1162 if (!ic_proto_have_if)
1163 /* Error message already printed */
1164 return -1;
1165
1166 /*
1167 * Setup protocols
1168 */
1169#ifdef IPCONFIG_BOOTP
1170 if (do_bootp)
1171 ic_bootp_init();
1172#endif
1173#ifdef IPCONFIG_RARP
1174 if (do_rarp)
1175 ic_rarp_init();
1176#endif
1177
1178 /*
1179 * Send requests and wait, until we get an answer. This loop
1180 * seems to be a terrible waste of CPU time, but actually there is
1181 * only one process running at all, so we don't need to use any
1182 * scheduler functions.
1183 * [Actually we could now, but the nothing else running note still
1184 * applies.. - AC]
1185 */
1186 pr_notice("Sending %s%s%s requests .",
1187 do_bootp
1188 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "",
1189 (do_bootp && do_rarp) ? " and " : "",
1190 do_rarp ? "RARP" : "");
1191
1192 start_jiffies = jiffies;
1193 d = ic_first_dev;
1194 retries = CONF_SEND_RETRIES;
1195 get_random_bytes(&timeout, sizeof(timeout));
1196 timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned int) CONF_TIMEOUT_RANDOM);
1197 for (;;) {
1198 /* Track the device we are configuring */
1199 ic_dev_xid = d->xid;
1200
1201#ifdef IPCONFIG_BOOTP
1202 if (do_bootp && (d->able & IC_BOOTP))
1203 ic_bootp_send_if(d, jiffies - start_jiffies);
1204#endif
1205#ifdef IPCONFIG_RARP
1206 if (do_rarp && (d->able & IC_RARP))
1207 ic_rarp_send_if(d);
1208#endif
1209
1210 jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout);
1211 while (time_before(jiffies, jiff) && !ic_got_reply)
1212 schedule_timeout_uninterruptible(1);
1213#ifdef IPCONFIG_DHCP
1214 /* DHCP isn't done until we get a DHCPACK. */
1215 if ((ic_got_reply & IC_BOOTP) &&
1216 (ic_proto_enabled & IC_USE_DHCP) &&
1217 ic_dhcp_msgtype != DHCPACK) {
1218 ic_got_reply = 0;
1219 pr_cont(",");
1220 continue;
1221 }
1222#endif /* IPCONFIG_DHCP */
1223
1224 if (ic_got_reply) {
1225 pr_cont(" OK\n");
1226 break;
1227 }
1228
1229 if ((d = d->next))
1230 continue;
1231
1232 if (! --retries) {
1233 pr_cont(" timed out!\n");
1234 break;
1235 }
1236
1237 d = ic_first_dev;
1238
1239 timeout = timeout CONF_TIMEOUT_MULT;
1240 if (timeout > CONF_TIMEOUT_MAX)
1241 timeout = CONF_TIMEOUT_MAX;
1242
1243 pr_cont(".");
1244 }
1245
1246#ifdef IPCONFIG_BOOTP
1247 if (do_bootp)
1248 ic_bootp_cleanup();
1249#endif
1250#ifdef IPCONFIG_RARP
1251 if (do_rarp)
1252 ic_rarp_cleanup();
1253#endif
1254
1255 if (!ic_got_reply) {
1256 ic_myaddr = NONE;
1257 return -1;
1258 }
1259
1260 printk("IP-Config: Got %s answer from %pI4, ",
1261 ((ic_got_reply & IC_RARP) ? "RARP"
1262 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),
1263 &ic_servaddr);
1264 pr_cont("my address is %pI4\n", &ic_myaddr);
1265
1266 return 0;
1267}
1268
1269#endif /* IPCONFIG_DYNAMIC */
1270
1271#ifdef CONFIG_PROC_FS
1272
1273static int pnp_seq_show(struct seq_file *seq, void *v)
1274{
1275 int i;
1276
1277 if (ic_proto_used & IC_PROTO)
1278 seq_printf(seq, "#PROTO: %s\n",
1279 (ic_proto_used & IC_RARP) ? "RARP"
1280 : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP");
1281 else
1282 seq_puts(seq, "#MANUAL\n");
1283
1284 if (ic_domain[0])
1285 seq_printf(seq,
1286 "domain %s\n", ic_domain);
1287 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {
1288 if (ic_nameservers[i] != NONE)
1289 seq_printf(seq, "nameserver %pI4\n",
1290 &ic_nameservers[i]);
1291 }
1292 if (ic_servaddr != NONE)
1293 seq_printf(seq, "bootserver %pI4\n",
1294 &ic_servaddr);
1295 return 0;
1296}
1297
1298static int pnp_seq_open(struct inode *indoe, struct file *file)
1299{
1300 return single_open(file, pnp_seq_show, NULL);
1301}
1302
1303static const struct file_operations pnp_seq_fops = {
1304 .owner = THIS_MODULE,
1305 .open = pnp_seq_open,
1306 .read = seq_read,
1307 .llseek = seq_lseek,
1308 .release = single_release,
1309};
1310#endif /* CONFIG_PROC_FS */
1311
1312/*
1313 * Extract IP address from the parameter string if needed. Note that we
1314 * need to have root_server_addr set _before_ IPConfig gets called as it
1315 * can override it.
1316 */
1317__be32 __init root_nfs_parse_addr(char *name)
1318{
1319 __be32 addr;
1320 int octets = 0;
1321 char *cp, *cq;
1322
1323 cp = cq = name;
1324 while (octets < 4) {
1325 while (*cp >= '0' && *cp <= '9')
1326 cp++;
1327 if (cp == cq || cp - cq > 3)
1328 break;
1329 if (*cp == '.' || octets == 3)
1330 octets++;
1331 if (octets < 4)
1332 cp++;
1333 cq = cp;
1334 }
1335 if (octets == 4 && (*cp == ':' || *cp == '\0')) {
1336 if (*cp == ':')
1337 *cp++ = '\0';
1338 addr = in_aton(name);
1339 memmove(name, cp, strlen(cp) + 1);
1340 } else
1341 addr = NONE;
1342
1343 return addr;
1344}
1345
1346#define DEVICE_WAIT_MAX 12 /* 12 seconds */
1347
1348static int __init wait_for_devices(void)
1349{
1350 int i;
1351
1352 for (i = 0; i < DEVICE_WAIT_MAX; i++) {
1353 struct net_device *dev;
1354 int found = 0;
1355
1356 rtnl_lock();
1357 for_each_netdev(&init_net, dev) {
1358 if (ic_is_init_dev(dev)) {
1359 found = 1;
1360 break;
1361 }
1362 }
1363 rtnl_unlock();
1364 if (found)
1365 return 0;
1366 ssleep(1);
1367 }
1368 return -ENODEV;
1369}
1370
1371/*
1372 * IP Autoconfig dispatcher.
1373 */
1374
1375static int __init ip_auto_config(void)
1376{
1377 __be32 addr;
1378#ifdef IPCONFIG_DYNAMIC
1379 int retries = CONF_OPEN_RETRIES;
1380#endif
1381 int err;
1382
1383#ifdef CONFIG_PROC_FS
1384 proc_net_fops_create(&init_net, "pnp", S_IRUGO, &pnp_seq_fops);
1385#endif /* CONFIG_PROC_FS */
1386
1387 if (!ic_enable)
1388 return 0;
1389
1390 DBG(("IP-Config: Entered.\n"));
1391#ifdef IPCONFIG_DYNAMIC
1392 try_try_again:
1393#endif
1394 /* Wait for devices to appear */
1395 err = wait_for_devices();
1396 if (err)
1397 return err;
1398
1399 /* Setup all network devices */
1400 err = ic_open_devs();
1401 if (err)
1402 return err;
1403
1404 /* Give drivers a chance to settle */
1405 msleep(CONF_POST_OPEN);
1406
1407 /*
1408 * If the config information is insufficient (e.g., our IP address or
1409 * IP address of the boot server is missing or we have multiple network
1410 * interfaces and no default was set), use BOOTP or RARP to get the
1411 * missing values.
1412 */
1413 if (ic_myaddr == NONE ||
1414#ifdef CONFIG_ROOT_NFS
1415 (root_server_addr == NONE &&
1416 ic_servaddr == NONE &&
1417 ROOT_DEV == Root_NFS) ||
1418#endif
1419 ic_first_dev->next) {
1420#ifdef IPCONFIG_DYNAMIC
1421 if (ic_dynamic() < 0) {
1422 ic_close_devs();
1423
1424 /*
1425 * I don't know why, but sometimes the
1426 * eepro100 driver (at least) gets upset and
1427 * doesn't work the first time it's opened.
1428 * But then if you close it and reopen it, it
1429 * works just fine. So we need to try that at
1430 * least once before giving up.
1431 *
1432 * Also, if the root will be NFS-mounted, we
1433 * have nowhere to go if DHCP fails. So we
1434 * just have to keep trying forever.
1435 *
1436 * -- Chip
1437 */
1438#ifdef CONFIG_ROOT_NFS
1439 if (ROOT_DEV == Root_NFS) {
1440 pr_err("IP-Config: Retrying forever (NFS root)...\n");
1441 goto try_try_again;
1442 }
1443#endif
1444
1445 if (--retries) {
1446 pr_err("IP-Config: Reopening network devices...\n");
1447 goto try_try_again;
1448 }
1449
1450 /* Oh, well. At least we tried. */
1451 pr_err("IP-Config: Auto-configuration of network failed\n");
1452 return -1;
1453 }
1454#else /* !DYNAMIC */
1455 pr_err("IP-Config: Incomplete network configuration information\n");
1456 ic_close_devs();
1457 return -1;
1458#endif /* IPCONFIG_DYNAMIC */
1459 } else {
1460 /* Device selected manually or only one device -> use it */
1461 ic_dev = ic_first_dev->dev;
1462 }
1463
1464 addr = root_nfs_parse_addr(root_server_path);
1465 if (root_server_addr == NONE)
1466 root_server_addr = addr;
1467
1468 /*
1469 * Use defaults wherever applicable.
1470 */
1471 if (ic_defaults() < 0)
1472 return -1;
1473
1474 /*
1475 * Close all network devices except the device we've
1476 * autoconfigured and set up routes.
1477 */
1478 ic_close_devs();
1479 if (ic_setup_if() < 0 || ic_setup_routes() < 0)
1480 return -1;
1481
1482 /*
1483 * Record which protocol was actually used.
1484 */
1485#ifdef IPCONFIG_DYNAMIC
1486 ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP);
1487#endif
1488
1489#ifndef IPCONFIG_SILENT
1490 /*
1491 * Clue in the operator.
1492 */
1493 pr_info("IP-Config: Complete:\n");
1494 pr_info(" device=%s, addr=%pI4, mask=%pI4, gw=%pI4\n",
1495 ic_dev->name, &ic_myaddr, &ic_netmask, &ic_gateway);
1496 pr_info(" host=%s, domain=%s, nis-domain=%s\n",
1497 utsname()->nodename, ic_domain, utsname()->domainname);
1498 pr_info(" bootserver=%pI4, rootserver=%pI4, rootpath=%s",
1499 &ic_servaddr, &root_server_addr, root_server_path);
1500 if (ic_dev_mtu)
1501 pr_cont(", mtu=%d", ic_dev_mtu);
1502 pr_cont("\n");
1503#endif /* !SILENT */
1504
1505 return 0;
1506}
1507
1508late_initcall(ip_auto_config);
1509
1510
1511/*
1512 * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
1513 * command line parameter. See Documentation/filesystems/nfs/nfsroot.txt.
1514 */
1515static int __init ic_proto_name(char *name)
1516{
1517 if (!strcmp(name, "on") || !strcmp(name, "any")) {
1518 return 1;
1519 }
1520 if (!strcmp(name, "off") || !strcmp(name, "none")) {
1521 return 0;
1522 }
1523#ifdef CONFIG_IP_PNP_DHCP
1524 else if (!strcmp(name, "dhcp")) {
1525 ic_proto_enabled &= ~IC_RARP;
1526 return 1;
1527 }
1528#endif
1529#ifdef CONFIG_IP_PNP_BOOTP
1530 else if (!strcmp(name, "bootp")) {
1531 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP);
1532 return 1;
1533 }
1534#endif
1535#ifdef CONFIG_IP_PNP_RARP
1536 else if (!strcmp(name, "rarp")) {
1537 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP);
1538 return 1;
1539 }
1540#endif
1541#ifdef IPCONFIG_DYNAMIC
1542 else if (!strcmp(name, "both")) {
1543 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */
1544 return 1;
1545 }
1546#endif
1547 return 0;
1548}
1549
1550static int __init ip_auto_config_setup(char *addrs)
1551{
1552 char *cp, *ip, *dp;
1553 int num = 0;
1554
1555 ic_set_manually = 1;
1556 ic_enable = 1;
1557
1558 /*
1559 * If any dhcp, bootp etc options are set, leave autoconfig on
1560 * and skip the below static IP processing.
1561 */
1562 if (ic_proto_name(addrs))
1563 return 1;
1564
1565 /* If no static IP is given, turn off autoconfig and bail. */
1566 if (*addrs == 0 ||
1567 strcmp(addrs, "off") == 0 ||
1568 strcmp(addrs, "none") == 0) {
1569 ic_enable = 0;
1570 return 1;
1571 }
1572
1573 /* Parse string for static IP assignment. */
1574 ip = addrs;
1575 while (ip && *ip) {
1576 if ((cp = strchr(ip, ':')))
1577 *cp++ = '\0';
1578 if (strlen(ip) > 0) {
1579 DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip));
1580 switch (num) {
1581 case 0:
1582 if ((ic_myaddr = in_aton(ip)) == ANY)
1583 ic_myaddr = NONE;
1584 break;
1585 case 1:
1586 if ((ic_servaddr = in_aton(ip)) == ANY)
1587 ic_servaddr = NONE;
1588 break;
1589 case 2:
1590 if ((ic_gateway = in_aton(ip)) == ANY)
1591 ic_gateway = NONE;
1592 break;
1593 case 3:
1594 if ((ic_netmask = in_aton(ip)) == ANY)
1595 ic_netmask = NONE;
1596 break;
1597 case 4:
1598 if ((dp = strchr(ip, '.'))) {
1599 *dp++ = '\0';
1600 strlcpy(utsname()->domainname, dp,
1601 sizeof(utsname()->domainname));
1602 }
1603 strlcpy(utsname()->nodename, ip,
1604 sizeof(utsname()->nodename));
1605 ic_host_name_set = 1;
1606 break;
1607 case 5:
1608 strlcpy(user_dev_name, ip, sizeof(user_dev_name));
1609 break;
1610 case 6:
1611 if (ic_proto_name(ip) == 0 &&
1612 ic_myaddr == NONE) {
1613 ic_enable = 0;
1614 }
1615 break;
1616 }
1617 }
1618 ip = cp;
1619 num++;
1620 }
1621
1622 return 1;
1623}
1624__setup("ip=", ip_auto_config_setup);
1625
1626static int __init nfsaddrs_config_setup(char *addrs)
1627{
1628 return ip_auto_config_setup(addrs);
1629}
1630__setup("nfsaddrs=", nfsaddrs_config_setup);
1631
1632static int __init vendor_class_identifier_setup(char *addrs)
1633{
1634 if (strlcpy(vendor_class_identifier, addrs,
1635 sizeof(vendor_class_identifier))
1636 >= sizeof(vendor_class_identifier))
1637 pr_warn("DHCP: vendorclass too long, truncated to \"%s\"",
1638 vendor_class_identifier);
1639 return 1;
1640}
1641__setup("dhcpclass=", vendor_class_identifier_setup);