blob: b9d84e800cf4385b9d0bf51fe8aae78989d295b4 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 * 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
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +090013 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070014 * 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070032#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>
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020042#include <linux/inetdevice.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070043#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>
Adrian Bunk43d60662005-09-05 18:05:52 -070055#include <linux/nfs_fs.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090056#include <linux/slab.h>
Eric W. Biederman457c4cb2007-09-12 12:01:34 +020057#include <net/net_namespace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070058#include <net/arp.h>
59#include <net/ip.h>
60#include <net/ipconfig.h>
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020061#include <net/route.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070062
63#include <asm/uaccess.h>
64#include <net/checksum.h>
65#include <asm/processor.h>
66
67/* Define this to allow debugging output */
68#undef IPCONFIG_DEBUG
69
70#ifdef IPCONFIG_DEBUG
71#define DBG(x) printk x
72#else
73#define DBG(x) do { } while(0)
74#endif
75
76#if defined(CONFIG_IP_PNP_DHCP)
77#define IPCONFIG_DHCP
78#endif
79#if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_DHCP)
80#define IPCONFIG_BOOTP
81#endif
82#if defined(CONFIG_IP_PNP_RARP)
83#define IPCONFIG_RARP
84#endif
85#if defined(IPCONFIG_BOOTP) || defined(IPCONFIG_RARP)
86#define IPCONFIG_DYNAMIC
87#endif
88
89/* Define the friendly delay before and after opening net devices */
90#define CONF_PRE_OPEN 500 /* Before opening: 1/2 second */
91#define CONF_POST_OPEN 1 /* After opening: 1 second */
92
93/* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */
94#define CONF_OPEN_RETRIES 2 /* (Re)open devices twice */
95#define CONF_SEND_RETRIES 6 /* Send six requests per open */
96#define CONF_INTER_TIMEOUT (HZ/2) /* Inter-device timeout: 1/2 second */
97#define CONF_BASE_TIMEOUT (HZ*2) /* Initial timeout: 2 seconds */
98#define CONF_TIMEOUT_RANDOM (HZ) /* Maximum amount of randomization */
99#define CONF_TIMEOUT_MULT *7/4 /* Rate of timeout growth */
100#define CONF_TIMEOUT_MAX (HZ*30) /* Maximum allowed timeout */
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900101#define CONF_NAMESERVERS_MAX 3 /* Maximum number of nameservers
102 - '3' from resolv.h */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103
Harvey Harrison09640e62009-02-01 00:45:17 -0800104#define NONE cpu_to_be32(INADDR_NONE)
105#define ANY cpu_to_be32(INADDR_ANY)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106
107/*
108 * Public IP configuration
109 */
110
111/* This is used by platforms which might be able to set the ipconfig
112 * variables using firmware environment vars. If this is set, it will
113 * ignore such firmware variables.
114 */
115int ic_set_manually __initdata = 0; /* IPconfig parameters set manually */
116
117static int ic_enable __initdata = 0; /* IP config enabled? */
118
119/* Protocol choice */
120int ic_proto_enabled __initdata = 0
121#ifdef IPCONFIG_BOOTP
122 | IC_BOOTP
123#endif
124#ifdef CONFIG_IP_PNP_DHCP
125 | IC_USE_DHCP
126#endif
127#ifdef IPCONFIG_RARP
128 | IC_RARP
129#endif
130 ;
131
132static int ic_host_name_set __initdata = 0; /* Host name set by us? */
133
Al Viro5a874db2006-11-08 00:19:38 -0800134__be32 ic_myaddr = NONE; /* My IP address */
135static __be32 ic_netmask = NONE; /* Netmask for local subnet */
136__be32 ic_gateway = NONE; /* Gateway IP address */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137
Al Viro5a874db2006-11-08 00:19:38 -0800138__be32 ic_servaddr = NONE; /* Boot server IP address */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139
Al Viro5a874db2006-11-08 00:19:38 -0800140__be32 root_server_addr = NONE; /* Address of NFS server */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141u8 root_server_path[256] = { 0, }; /* Path to mount as root */
142
Chris Friesen2513dfb2009-05-17 20:39:33 -0700143u32 ic_dev_xid; /* Device under configuration */
144
David S. Miller1b0b04f2007-11-19 21:56:16 -0800145/* vendor class identifier */
146static char vendor_class_identifier[253] __initdata;
Rainer Jochem62013db2007-11-14 02:18:39 -0800147
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148/* Persistent data: */
149
150static int ic_proto_used; /* Protocol used, if any */
Al Viro5a874db2006-11-08 00:19:38 -0800151static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152static u8 ic_domain[64]; /* DNS (not NIS) domain name */
153
154/*
155 * Private state.
156 */
157
158/* Name of user-selected boot device */
159static char user_dev_name[IFNAMSIZ] __initdata = { 0, };
160
161/* Protocols supported by available interfaces */
162static int ic_proto_have_if __initdata = 0;
163
Chris Friesen9643f452009-05-19 15:31:50 -0700164/* MTU for boot device */
165static int ic_dev_mtu __initdata = 0;
166
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167#ifdef IPCONFIG_DYNAMIC
168static DEFINE_SPINLOCK(ic_recv_lock);
169static volatile int ic_got_reply __initdata = 0; /* Proto(s) that replied */
170#endif
171#ifdef IPCONFIG_DHCP
172static int ic_dhcp_msgtype __initdata = 0; /* DHCP msg type received */
173#endif
174
175
176/*
177 * Network devices
178 */
179
180struct ic_device {
181 struct ic_device *next;
182 struct net_device *dev;
183 unsigned short flags;
184 short able;
Al Viro5a874db2006-11-08 00:19:38 -0800185 __be32 xid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186};
187
188static struct ic_device *ic_first_dev __initdata = NULL;/* List of open device */
189static struct net_device *ic_dev __initdata = NULL; /* Selected device */
190
David S. Miller964ad812010-03-12 00:00:17 -0800191static bool __init ic_device_match(struct net_device *dev)
192{
193 if (user_dev_name[0] ? !strcmp(dev->name, user_dev_name) :
194 (!(dev->flags & IFF_LOOPBACK) &&
195 (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) &&
196 strncmp(dev->name, "dummy", 5)))
197 return true;
198 return false;
199}
200
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201static int __init ic_open_devs(void)
202{
203 struct ic_device *d, **last;
204 struct net_device *dev;
205 unsigned short oflags;
206
207 last = &ic_first_dev;
Stephen Hemminger6756ae42006-03-20 22:23:58 -0800208 rtnl_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209
210 /* bring loopback device up first */
Eric W. Biederman0cc217e2007-09-26 22:10:06 -0700211 for_each_netdev(&init_net, dev) {
212 if (!(dev->flags & IFF_LOOPBACK))
213 continue;
214 if (dev_change_flags(dev, dev->flags | IFF_UP) < 0)
215 printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name);
216 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217
Eric W. Biederman881d9662007-09-17 11:56:21 -0700218 for_each_netdev(&init_net, dev) {
Eric W. Biederman0cc217e2007-09-26 22:10:06 -0700219 if (dev->flags & IFF_LOOPBACK)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220 continue;
David S. Miller964ad812010-03-12 00:00:17 -0800221 if (ic_device_match(dev)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222 int able = 0;
223 if (dev->mtu >= 364)
224 able |= IC_BOOTP;
225 else
226 printk(KERN_WARNING "DHCP/BOOTP: Ignoring device %s, MTU %d too small", dev->name, dev->mtu);
227 if (!(dev->flags & IFF_NOARP))
228 able |= IC_RARP;
229 able &= ic_proto_enabled;
230 if (ic_proto_enabled && !able)
231 continue;
232 oflags = dev->flags;
233 if (dev_change_flags(dev, oflags | IFF_UP) < 0) {
234 printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name);
235 continue;
236 }
237 if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) {
Stephen Hemminger6756ae42006-03-20 22:23:58 -0800238 rtnl_unlock();
David S. Miller964ad812010-03-12 00:00:17 -0800239 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240 }
241 d->dev = dev;
242 *last = d;
243 last = &d->next;
244 d->flags = oflags;
245 d->able = able;
246 if (able & IC_BOOTP)
Al Viro5a874db2006-11-08 00:19:38 -0800247 get_random_bytes(&d->xid, sizeof(__be32));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248 else
249 d->xid = 0;
250 ic_proto_have_if |= able;
251 DBG(("IP-Config: %s UP (able=%d, xid=%08x)\n",
252 dev->name, able, d->xid));
253 }
254 }
Stephen Hemminger6756ae42006-03-20 22:23:58 -0800255 rtnl_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256
257 *last = NULL;
258
259 if (!ic_first_dev) {
260 if (user_dev_name[0])
261 printk(KERN_ERR "IP-Config: Device `%s' not found.\n", user_dev_name);
262 else
263 printk(KERN_ERR "IP-Config: No network devices available.\n");
David S. Miller964ad812010-03-12 00:00:17 -0800264 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265 }
266 return 0;
267}
268
269static void __init ic_close_devs(void)
270{
271 struct ic_device *d, *next;
272 struct net_device *dev;
273
Stephen Hemminger6756ae42006-03-20 22:23:58 -0800274 rtnl_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275 next = ic_first_dev;
276 while ((d = next)) {
277 next = d->next;
278 dev = d->dev;
279 if (dev != ic_dev) {
280 DBG(("IP-Config: Downing %s\n", dev->name));
281 dev_change_flags(dev, d->flags);
282 }
283 kfree(d);
284 }
Stephen Hemminger6756ae42006-03-20 22:23:58 -0800285 rtnl_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286}
287
288/*
289 * Interface to various network functions.
290 */
291
292static inline void
Al Viro5a874db2006-11-08 00:19:38 -0800293set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294{
295 sin->sin_family = AF_INET;
296 sin->sin_addr.s_addr = addr;
297 sin->sin_port = port;
298}
299
Chris Friesen9643f452009-05-19 15:31:50 -0700300static int __init ic_devinet_ioctl(unsigned int cmd, struct ifreq *arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301{
302 int res;
303
304 mm_segment_t oldfs = get_fs();
305 set_fs(get_ds());
Denis V. Luneve5b13cb2008-02-28 20:51:43 -0800306 res = devinet_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 set_fs(oldfs);
308 return res;
309}
310
Chris Friesen9643f452009-05-19 15:31:50 -0700311static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg)
312{
313 int res;
314
315 mm_segment_t oldfs = get_fs();
316 set_fs(get_ds());
317 res = dev_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
318 set_fs(oldfs);
319 return res;
320}
321
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg)
323{
324 int res;
325
326 mm_segment_t oldfs = get_fs();
327 set_fs(get_ds());
Denis V. Lunev1bad1182008-01-10 03:29:53 -0800328 res = ip_rt_ioctl(&init_net, cmd, (void __user *) arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329 set_fs(oldfs);
330 return res;
331}
332
333/*
334 * Set up interface addresses and routes.
335 */
336
337static int __init ic_setup_if(void)
338{
339 struct ifreq ir;
340 struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr;
341 int err;
342
343 memset(&ir, 0, sizeof(ir));
344 strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name);
345 set_sockaddr(sin, ic_myaddr, 0);
Chris Friesen9643f452009-05-19 15:31:50 -0700346 if ((err = ic_devinet_ioctl(SIOCSIFADDR, &ir)) < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347 printk(KERN_ERR "IP-Config: Unable to set interface address (%d).\n", err);
348 return -1;
349 }
350 set_sockaddr(sin, ic_netmask, 0);
Chris Friesen9643f452009-05-19 15:31:50 -0700351 if ((err = ic_devinet_ioctl(SIOCSIFNETMASK, &ir)) < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352 printk(KERN_ERR "IP-Config: Unable to set interface netmask (%d).\n", err);
353 return -1;
354 }
355 set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0);
Chris Friesen9643f452009-05-19 15:31:50 -0700356 if ((err = ic_devinet_ioctl(SIOCSIFBRDADDR, &ir)) < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357 printk(KERN_ERR "IP-Config: Unable to set interface broadcast address (%d).\n", err);
358 return -1;
359 }
Chris Friesen9643f452009-05-19 15:31:50 -0700360 /* Handle the case where we need non-standard MTU on the boot link (a network
361 * using jumbo frames, for instance). If we can't set the mtu, don't error
362 * out, we'll try to muddle along.
363 */
364 if (ic_dev_mtu != 0) {
365 strcpy(ir.ifr_name, ic_dev->name);
366 ir.ifr_mtu = ic_dev_mtu;
367 if ((err = ic_dev_ioctl(SIOCSIFMTU, &ir)) < 0)
368 printk(KERN_ERR "IP-Config: Unable to set interface mtu to %d (%d).\n",
369 ic_dev_mtu, err);
370 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371 return 0;
372}
373
374static int __init ic_setup_routes(void)
375{
376 /* No need to setup device routes, only the default route... */
377
Al Viro5a874db2006-11-08 00:19:38 -0800378 if (ic_gateway != NONE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379 struct rtentry rm;
380 int err;
381
382 memset(&rm, 0, sizeof(rm));
383 if ((ic_gateway ^ ic_myaddr) & ic_netmask) {
384 printk(KERN_ERR "IP-Config: Gateway not on directly connected network.\n");
385 return -1;
386 }
387 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0);
388 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0);
389 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0);
390 rm.rt_flags = RTF_UP | RTF_GATEWAY;
391 if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) {
392 printk(KERN_ERR "IP-Config: Cannot add default route (%d).\n", err);
393 return -1;
394 }
395 }
396
397 return 0;
398}
399
400/*
401 * Fill in default values for all missing parameters.
402 */
403
404static int __init ic_defaults(void)
405{
406 /*
407 * At this point we have no userspace running so need not
408 * claim locks on system_utsname
409 */
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900410
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411 if (!ic_host_name_set)
Harvey Harrison673d57e2008-10-31 00:53:57 -0700412 sprintf(init_utsname()->nodename, "%pI4", &ic_myaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413
Al Viro5a874db2006-11-08 00:19:38 -0800414 if (root_server_addr == NONE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 root_server_addr = ic_servaddr;
416
Al Viro5a874db2006-11-08 00:19:38 -0800417 if (ic_netmask == NONE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418 if (IN_CLASSA(ntohl(ic_myaddr)))
419 ic_netmask = htonl(IN_CLASSA_NET);
420 else if (IN_CLASSB(ntohl(ic_myaddr)))
421 ic_netmask = htonl(IN_CLASSB_NET);
422 else if (IN_CLASSC(ntohl(ic_myaddr)))
423 ic_netmask = htonl(IN_CLASSC_NET);
424 else {
Harvey Harrison673d57e2008-10-31 00:53:57 -0700425 printk(KERN_ERR "IP-Config: Unable to guess netmask for address %pI4\n",
426 &ic_myaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427 return -1;
428 }
Harvey Harrison673d57e2008-10-31 00:53:57 -0700429 printk("IP-Config: Guessing netmask %pI4\n", &ic_netmask);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430 }
431
432 return 0;
433}
434
435/*
436 * RARP support.
437 */
438
439#ifdef IPCONFIG_RARP
440
David S. Millerf2ccd8f2005-08-09 19:34:12 -0700441static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442
443static struct packet_type rarp_packet_type __initdata = {
Harvey Harrison09640e62009-02-01 00:45:17 -0800444 .type = cpu_to_be16(ETH_P_RARP),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445 .func = ic_rarp_recv,
446};
447
Sam Ravnborg45e741b2008-04-29 20:58:15 -0700448static inline void __init ic_rarp_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449{
450 dev_add_pack(&rarp_packet_type);
451}
452
Sam Ravnborg45e741b2008-04-29 20:58:15 -0700453static inline void __init ic_rarp_cleanup(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454{
455 dev_remove_pack(&rarp_packet_type);
456}
457
458/*
459 * Process received RARP packet.
460 */
461static int __init
David S. Millerf2ccd8f2005-08-09 19:34:12 -0700462ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463{
464 struct arphdr *rarp;
465 unsigned char *rarp_ptr;
Al Viro5a874db2006-11-08 00:19:38 -0800466 __be32 sip, tip;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467 unsigned char *sha, *tha; /* s for "source", t for "target" */
468 struct ic_device *d;
469
YOSHIFUJI Hideaki721499e2008-07-19 22:34:43 -0700470 if (!net_eq(dev_net(dev), &init_net))
Eric W. Biedermane730c152007-09-17 11:53:39 -0700471 goto drop;
472
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
474 return NET_RX_DROP;
475
476 if (!pskb_may_pull(skb, sizeof(struct arphdr)))
477 goto drop;
478
479 /* Basic sanity checks can be done without the lock. */
Arnaldo Carvalho de Melo9c702202007-04-25 18:04:18 -0700480 rarp = (struct arphdr *)skb_transport_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481
482 /* If this test doesn't pass, it's not IP, or we should
483 * ignore it anyway.
484 */
485 if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd))
486 goto drop;
487
488 /* If it's not a RARP reply, delete it. */
489 if (rarp->ar_op != htons(ARPOP_RREPLY))
490 goto drop;
491
492 /* If it's not Ethernet, delete it. */
493 if (rarp->ar_pro != htons(ETH_P_IP))
494 goto drop;
495
Pavel Emelyanov988b7052008-03-03 12:20:57 -0800496 if (!pskb_may_pull(skb, arp_hdr_len(dev)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497 goto drop;
498
499 /* OK, it is all there and looks valid, process... */
Arnaldo Carvalho de Melo9c702202007-04-25 18:04:18 -0700500 rarp = (struct arphdr *)skb_transport_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501 rarp_ptr = (unsigned char *) (rarp + 1);
502
503 /* One reply at a time, please. */
504 spin_lock(&ic_recv_lock);
505
506 /* If we already have a reply, just drop the packet */
507 if (ic_got_reply)
508 goto drop_unlock;
509
510 /* Find the ic_device that the packet arrived on */
511 d = ic_first_dev;
512 while (d && d->dev != dev)
513 d = d->next;
514 if (!d)
515 goto drop_unlock; /* should never happen */
516
517 /* Extract variable-width fields */
518 sha = rarp_ptr;
519 rarp_ptr += dev->addr_len;
520 memcpy(&sip, rarp_ptr, 4);
521 rarp_ptr += 4;
522 tha = rarp_ptr;
523 rarp_ptr += dev->addr_len;
524 memcpy(&tip, rarp_ptr, 4);
525
526 /* Discard packets which are not meant for us. */
527 if (memcmp(tha, dev->dev_addr, dev->addr_len))
528 goto drop_unlock;
529
530 /* Discard packets which are not from specified server. */
Al Viro5a874db2006-11-08 00:19:38 -0800531 if (ic_servaddr != NONE && ic_servaddr != sip)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532 goto drop_unlock;
533
534 /* We have a winner! */
535 ic_dev = dev;
Al Viro5a874db2006-11-08 00:19:38 -0800536 if (ic_myaddr == NONE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537 ic_myaddr = tip;
538 ic_servaddr = sip;
539 ic_got_reply = IC_RARP;
540
541drop_unlock:
542 /* Show's over. Nothing to see here. */
543 spin_unlock(&ic_recv_lock);
544
545drop:
546 /* Throw the packet out. */
547 kfree_skb(skb);
548 return 0;
549}
550
551
552/*
553 * Send RARP request packet over a single interface.
554 */
555static void __init ic_rarp_send_if(struct ic_device *d)
556{
557 struct net_device *dev = d->dev;
558 arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL,
559 dev->dev_addr, dev->dev_addr);
560}
561#endif
562
563/*
564 * DHCP/BOOTP support.
565 */
566
567#ifdef IPCONFIG_BOOTP
568
569struct bootp_pkt { /* BOOTP packet format */
570 struct iphdr iph; /* IP header */
571 struct udphdr udph; /* UDP header */
572 u8 op; /* 1=request, 2=reply */
573 u8 htype; /* HW address type */
574 u8 hlen; /* HW address length */
575 u8 hops; /* Used only by gateways */
Al Viro5a874db2006-11-08 00:19:38 -0800576 __be32 xid; /* Transaction ID */
577 __be16 secs; /* Seconds since we started */
578 __be16 flags; /* Just what it says */
579 __be32 client_ip; /* Client's IP address if known */
580 __be32 your_ip; /* Assigned IP address */
581 __be32 server_ip; /* (Next, e.g. NFS) Server's IP address */
582 __be32 relay_ip; /* IP address of BOOTP relay */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583 u8 hw_addr[16]; /* Client's HW address */
584 u8 serv_name[64]; /* Server host name */
585 u8 boot_file[128]; /* Name of boot file */
586 u8 exten[312]; /* DHCP options / BOOTP vendor extensions */
587};
588
589/* packet ops */
590#define BOOTP_REQUEST 1
591#define BOOTP_REPLY 2
592
593/* DHCP message types */
594#define DHCPDISCOVER 1
595#define DHCPOFFER 2
596#define DHCPREQUEST 3
597#define DHCPDECLINE 4
598#define DHCPACK 5
599#define DHCPNAK 6
600#define DHCPRELEASE 7
601#define DHCPINFORM 8
602
David S. Millerf2ccd8f2005-08-09 19:34:12 -0700603static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604
605static struct packet_type bootp_packet_type __initdata = {
Harvey Harrison09640e62009-02-01 00:45:17 -0800606 .type = cpu_to_be16(ETH_P_IP),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607 .func = ic_bootp_recv,
608};
609
610
611/*
612 * Initialize DHCP/BOOTP extension fields in the request.
613 */
614
615static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 };
616
617#ifdef IPCONFIG_DHCP
618
619static void __init
620ic_dhcp_init_options(u8 *options)
621{
Al Viro5a874db2006-11-08 00:19:38 -0800622 u8 mt = ((ic_servaddr == NONE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700623 ? DHCPDISCOVER : DHCPREQUEST);
624 u8 *e = options;
Rainer Jochem62013db2007-11-14 02:18:39 -0800625 int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700626
627#ifdef IPCONFIG_DEBUG
628 printk("DHCP: Sending message type %d\n", mt);
629#endif
630
631 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */
632 e += 4;
633
634 *e++ = 53; /* DHCP message type */
635 *e++ = 1;
636 *e++ = mt;
637
638 if (mt == DHCPREQUEST) {
639 *e++ = 54; /* Server ID (IP address) */
640 *e++ = 4;
641 memcpy(e, &ic_servaddr, 4);
642 e += 4;
643
644 *e++ = 50; /* Requested IP address */
645 *e++ = 4;
646 memcpy(e, &ic_myaddr, 4);
647 e += 4;
648 }
649
650 /* always? */
651 {
652 static const u8 ic_req_params[] = {
653 1, /* Subnet mask */
654 3, /* Default gateway */
655 6, /* DNS server */
656 12, /* Host name */
657 15, /* Domain name */
658 17, /* Boot path */
Chris Friesen9643f452009-05-19 15:31:50 -0700659 26, /* MTU */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660 40, /* NIS domain name */
661 };
662
663 *e++ = 55; /* Parameter request list */
664 *e++ = sizeof(ic_req_params);
665 memcpy(e, ic_req_params, sizeof(ic_req_params));
666 e += sizeof(ic_req_params);
Rainer Jochem62013db2007-11-14 02:18:39 -0800667
668 if (*vendor_class_identifier) {
669 printk(KERN_INFO "DHCP: sending class identifier \"%s\"\n",
670 vendor_class_identifier);
671 *e++ = 60; /* Class-identifier */
672 len = strlen(vendor_class_identifier);
673 *e++ = len;
674 memcpy(e, vendor_class_identifier, len);
675 e += len;
676 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700677 }
678
679 *e++ = 255; /* End of the list */
680}
681
682#endif /* IPCONFIG_DHCP */
683
684static void __init ic_bootp_init_ext(u8 *e)
685{
686 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */
687 e += 4;
688 *e++ = 1; /* Subnet mask request */
689 *e++ = 4;
690 e += 4;
691 *e++ = 3; /* Default gateway request */
692 *e++ = 4;
693 e += 4;
694 *e++ = 5; /* Name server request */
695 *e++ = 8;
696 e += 8;
697 *e++ = 12; /* Host name request */
698 *e++ = 32;
699 e += 32;
700 *e++ = 40; /* NIS Domain name request */
701 *e++ = 32;
702 e += 32;
703 *e++ = 17; /* Boot path */
704 *e++ = 40;
705 e += 40;
706
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900707 *e++ = 57; /* set extension buffer size for reply */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708 *e++ = 2;
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900709 *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710 *e++ = 150;
711
712 *e++ = 255; /* End of the list */
713}
714
715
716/*
717 * Initialize the DHCP/BOOTP mechanism.
718 */
Sam Ravnborg45e741b2008-04-29 20:58:15 -0700719static inline void __init ic_bootp_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720{
721 int i;
722
723 for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
Al Viro5a874db2006-11-08 00:19:38 -0800724 ic_nameservers[i] = NONE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725
726 dev_add_pack(&bootp_packet_type);
727}
728
729
730/*
731 * DHCP/BOOTP cleanup.
732 */
Sam Ravnborg45e741b2008-04-29 20:58:15 -0700733static inline void __init ic_bootp_cleanup(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734{
735 dev_remove_pack(&bootp_packet_type);
736}
737
738
739/*
740 * Send DHCP/BOOTP request to single interface.
741 */
742static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff)
743{
744 struct net_device *dev = d->dev;
745 struct sk_buff *skb;
746 struct bootp_pkt *b;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747 struct iphdr *h;
748
749 /* Allocate packet */
Johannes Bergf5184d22008-05-12 20:48:31 -0700750 skb = alloc_skb(sizeof(struct bootp_pkt) + LL_ALLOCATED_SPACE(dev) + 15,
751 GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752 if (!skb)
753 return;
Johannes Bergf5184d22008-05-12 20:48:31 -0700754 skb_reserve(skb, LL_RESERVED_SPACE(dev));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700755 b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt));
756 memset(b, 0, sizeof(struct bootp_pkt));
757
758 /* Construct IP header */
Arnaldo Carvalho de Melo04b964d2007-03-10 19:27:27 -0300759 skb_reset_network_header(skb);
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700760 h = ip_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761 h->version = 4;
762 h->ihl = 5;
763 h->tot_len = htons(sizeof(struct bootp_pkt));
764 h->frag_off = htons(IP_DF);
765 h->ttl = 64;
766 h->protocol = IPPROTO_UDP;
Al Viro5a874db2006-11-08 00:19:38 -0800767 h->daddr = htonl(INADDR_BROADCAST);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768 h->check = ip_fast_csum((unsigned char *) h, h->ihl);
769
770 /* Construct UDP header */
771 b->udph.source = htons(68);
772 b->udph.dest = htons(67);
773 b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr));
774 /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */
775
776 /* Construct DHCP/BOOTP header */
777 b->op = BOOTP_REQUEST;
778 if (dev->type < 256) /* check for false types */
779 b->htype = dev->type;
780 else if (dev->type == ARPHRD_IEEE802_TR) /* fix for token ring */
781 b->htype = ARPHRD_IEEE802;
782 else if (dev->type == ARPHRD_FDDI)
783 b->htype = ARPHRD_ETHER;
784 else {
785 printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name);
786 b->htype = dev->type; /* can cause undefined behavior */
787 }
Stephen Hemmingerdea75bd2008-03-04 17:03:49 -0800788
789 /* server_ip and your_ip address are both already zero per RFC2131 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790 b->hlen = dev->addr_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700791 memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
792 b->secs = htons(jiffies_diff / HZ);
793 b->xid = d->xid;
794
795 /* add DHCP options or BOOTP extensions */
796#ifdef IPCONFIG_DHCP
797 if (ic_proto_enabled & IC_USE_DHCP)
798 ic_dhcp_init_options(b->exten);
799 else
800#endif
801 ic_bootp_init_ext(b->exten);
802
803 /* Chain packet down the line... */
804 skb->dev = dev;
805 skb->protocol = htons(ETH_P_IP);
Stephen Hemminger0c4e8582007-10-09 01:36:32 -0700806 if (dev_hard_header(skb, dev, ntohs(skb->protocol),
807 dev->broadcast, dev->dev_addr, skb->len) < 0 ||
Linus Torvalds1da177e2005-04-16 15:20:36 -0700808 dev_queue_xmit(skb) < 0)
809 printk("E");
810}
811
812
813/*
814 * Copy BOOTP-supplied string if not already set.
815 */
816static int __init ic_bootp_string(char *dest, char *src, int len, int max)
817{
818 if (!len)
819 return 0;
820 if (len > max-1)
821 len = max-1;
822 memcpy(dest, src, len);
823 dest[len] = '\0';
824 return 1;
825}
826
827
828/*
829 * Process BOOTP extensions.
830 */
831static void __init ic_do_bootp_ext(u8 *ext)
832{
833 u8 servers;
834 int i;
Chris Friesen9643f452009-05-19 15:31:50 -0700835 u16 mtu;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700836
837#ifdef IPCONFIG_DEBUG
838 u8 *c;
839
840 printk("DHCP/BOOTP: Got extension %d:",*ext);
Stephen Hemminger132adf52007-03-08 20:44:43 -0800841 for (c=ext+2; c<ext+2+ext[1]; c++)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842 printk(" %02x", *c);
843 printk("\n");
844#endif
845
846 switch (*ext++) {
847 case 1: /* Subnet mask */
Al Viro5a874db2006-11-08 00:19:38 -0800848 if (ic_netmask == NONE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700849 memcpy(&ic_netmask, ext+1, 4);
850 break;
851 case 3: /* Default gateway */
Al Viro5a874db2006-11-08 00:19:38 -0800852 if (ic_gateway == NONE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700853 memcpy(&ic_gateway, ext+1, 4);
854 break;
855 case 6: /* DNS server */
856 servers= *ext/4;
857 if (servers > CONF_NAMESERVERS_MAX)
858 servers = CONF_NAMESERVERS_MAX;
859 for (i = 0; i < servers; i++) {
Al Viro5a874db2006-11-08 00:19:38 -0800860 if (ic_nameservers[i] == NONE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700861 memcpy(&ic_nameservers[i], ext+1+4*i, 4);
862 }
863 break;
864 case 12: /* Host name */
Serge E. Hallyne9ff3992006-10-02 02:18:11 -0700865 ic_bootp_string(utsname()->nodename, ext+1, *ext, __NEW_UTS_LEN);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700866 ic_host_name_set = 1;
867 break;
868 case 15: /* Domain name (DNS) */
869 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
870 break;
871 case 17: /* Root path */
872 if (!root_server_path[0])
873 ic_bootp_string(root_server_path, ext+1, *ext, sizeof(root_server_path));
874 break;
Chris Friesen9643f452009-05-19 15:31:50 -0700875 case 26: /* Interface MTU */
876 memcpy(&mtu, ext+1, sizeof(mtu));
877 ic_dev_mtu = ntohs(mtu);
878 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700879 case 40: /* NIS Domain name (_not_ DNS) */
Serge E. Hallyne9ff3992006-10-02 02:18:11 -0700880 ic_bootp_string(utsname()->domainname, ext+1, *ext, __NEW_UTS_LEN);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700881 break;
882 }
883}
884
885
886/*
887 * Receive BOOTP reply.
888 */
David S. Millerf2ccd8f2005-08-09 19:34:12 -0700889static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700890{
891 struct bootp_pkt *b;
892 struct iphdr *h;
893 struct ic_device *d;
894 int len, ext_len;
895
YOSHIFUJI Hideaki721499e2008-07-19 22:34:43 -0700896 if (!net_eq(dev_net(dev), &init_net))
Eric W. Biedermane730c152007-09-17 11:53:39 -0700897 goto drop;
898
Linus Torvalds1da177e2005-04-16 15:20:36 -0700899 /* Perform verifications before taking the lock. */
900 if (skb->pkt_type == PACKET_OTHERHOST)
901 goto drop;
902
903 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
904 return NET_RX_DROP;
905
906 if (!pskb_may_pull(skb,
907 sizeof(struct iphdr) +
908 sizeof(struct udphdr)))
909 goto drop;
910
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700911 b = (struct bootp_pkt *)skb_network_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700912 h = &b->iph;
913
914 if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP)
915 goto drop;
916
917 /* Fragments are not supported */
918 if (h->frag_off & htons(IP_OFFSET | IP_MF)) {
919 if (net_ratelimit())
920 printk(KERN_ERR "DHCP/BOOTP: Ignoring fragmented "
921 "reply.\n");
922 goto drop;
923 }
924
925 if (skb->len < ntohs(h->tot_len))
926 goto drop;
927
928 if (ip_fast_csum((char *) h, h->ihl))
929 goto drop;
930
931 if (b->udph.source != htons(67) || b->udph.dest != htons(68))
932 goto drop;
933
934 if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
935 goto drop;
936
937 len = ntohs(b->udph.len) - sizeof(struct udphdr);
938 ext_len = len - (sizeof(*b) -
939 sizeof(struct iphdr) -
940 sizeof(struct udphdr) -
941 sizeof(b->exten));
942 if (ext_len < 0)
943 goto drop;
944
945 /* Ok the front looks good, make sure we can get at the rest. */
946 if (!pskb_may_pull(skb, skb->len))
947 goto drop;
948
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700949 b = (struct bootp_pkt *)skb_network_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700950 h = &b->iph;
951
952 /* One reply at a time, please. */
953 spin_lock(&ic_recv_lock);
954
955 /* If we already have a reply, just drop the packet */
956 if (ic_got_reply)
957 goto drop_unlock;
958
959 /* Find the ic_device that the packet arrived on */
960 d = ic_first_dev;
961 while (d && d->dev != dev)
962 d = d->next;
963 if (!d)
964 goto drop_unlock; /* should never happen */
965
966 /* Is it a reply to our BOOTP request? */
967 if (b->op != BOOTP_REPLY ||
968 b->xid != d->xid) {
969 if (net_ratelimit())
970 printk(KERN_ERR "DHCP/BOOTP: Reply not for us, "
971 "op[%x] xid[%x]\n",
972 b->op, b->xid);
973 goto drop_unlock;
974 }
975
Chris Friesen2513dfb2009-05-17 20:39:33 -0700976 /* Is it a reply for the device we are configuring? */
977 if (b->xid != ic_dev_xid) {
978 if (net_ratelimit())
Frans Popb1383382010-03-24 07:57:28 +0000979 printk(KERN_ERR "DHCP/BOOTP: Ignoring delayed packet\n");
Chris Friesen2513dfb2009-05-17 20:39:33 -0700980 goto drop_unlock;
981 }
982
Linus Torvalds1da177e2005-04-16 15:20:36 -0700983 /* Parse extensions */
984 if (ext_len >= 4 &&
985 !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900986 u8 *end = (u8 *) b + ntohs(b->iph.tot_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700987 u8 *ext;
988
989#ifdef IPCONFIG_DHCP
990 if (ic_proto_enabled & IC_USE_DHCP) {
Al Viro5a874db2006-11-08 00:19:38 -0800991 __be32 server_id = NONE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700992 int mt = 0;
993
994 ext = &b->exten[4];
995 while (ext < end && *ext != 0xff) {
996 u8 *opt = ext++;
997 if (*opt == 0) /* Padding */
998 continue;
999 ext += *ext + 1;
1000 if (ext >= end)
1001 break;
1002 switch (*opt) {
1003 case 53: /* Message type */
1004 if (opt[1])
1005 mt = opt[2];
1006 break;
1007 case 54: /* Server ID (IP address) */
1008 if (opt[1] >= 4)
1009 memcpy(&server_id, opt + 2, 4);
1010 break;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -07001011 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001012 }
1013
1014#ifdef IPCONFIG_DEBUG
1015 printk("DHCP: Got message type %d\n", mt);
1016#endif
1017
1018 switch (mt) {
1019 case DHCPOFFER:
1020 /* While in the process of accepting one offer,
1021 * ignore all others.
1022 */
Al Viro5a874db2006-11-08 00:19:38 -08001023 if (ic_myaddr != NONE)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001024 goto drop_unlock;
1025
1026 /* Let's accept that offer. */
1027 ic_myaddr = b->your_ip;
1028 ic_servaddr = server_id;
1029#ifdef IPCONFIG_DEBUG
Harvey Harrison673d57e2008-10-31 00:53:57 -07001030 printk("DHCP: Offered address %pI4 by server %pI4\n",
1031 &ic_myaddr, &ic_servaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001032#endif
1033 /* The DHCP indicated server address takes
1034 * precedence over the bootp header one if
1035 * they are different.
1036 */
Al Viro5a874db2006-11-08 00:19:38 -08001037 if ((server_id != NONE) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -07001038 (b->server_ip != server_id))
1039 b->server_ip = ic_servaddr;
1040 break;
1041
1042 case DHCPACK:
1043 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0)
1044 goto drop_unlock;
1045
1046 /* Yeah! */
1047 break;
1048
1049 default:
1050 /* Urque. Forget it*/
Al Viro5a874db2006-11-08 00:19:38 -08001051 ic_myaddr = NONE;
1052 ic_servaddr = NONE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001053 goto drop_unlock;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -07001054 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001055
1056 ic_dhcp_msgtype = mt;
1057
1058 }
1059#endif /* IPCONFIG_DHCP */
1060
1061 ext = &b->exten[4];
1062 while (ext < end && *ext != 0xff) {
1063 u8 *opt = ext++;
1064 if (*opt == 0) /* Padding */
1065 continue;
1066 ext += *ext + 1;
1067 if (ext < end)
1068 ic_do_bootp_ext(opt);
1069 }
1070 }
1071
1072 /* We have a winner! */
1073 ic_dev = dev;
1074 ic_myaddr = b->your_ip;
1075 ic_servaddr = b->server_ip;
Al Viro5a874db2006-11-08 00:19:38 -08001076 if (ic_gateway == NONE && b->relay_ip)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001077 ic_gateway = b->relay_ip;
Al Viro5a874db2006-11-08 00:19:38 -08001078 if (ic_nameservers[0] == NONE)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001079 ic_nameservers[0] = ic_servaddr;
1080 ic_got_reply = IC_BOOTP;
1081
1082drop_unlock:
1083 /* Show's over. Nothing to see here. */
1084 spin_unlock(&ic_recv_lock);
1085
1086drop:
1087 /* Throw the packet out. */
1088 kfree_skb(skb);
1089
1090 return 0;
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001091}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001092
1093
1094#endif
1095
1096
1097/*
1098 * Dynamic IP configuration -- DHCP, BOOTP, RARP.
1099 */
1100
1101#ifdef IPCONFIG_DYNAMIC
1102
1103static int __init ic_dynamic(void)
1104{
1105 int retries;
1106 struct ic_device *d;
1107 unsigned long start_jiffies, timeout, jiff;
1108 int do_bootp = ic_proto_have_if & IC_BOOTP;
1109 int do_rarp = ic_proto_have_if & IC_RARP;
1110
1111 /*
1112 * If none of DHCP/BOOTP/RARP was selected, return with an error.
1113 * This routine gets only called when some pieces of information
1114 * are missing, and without DHCP/BOOTP/RARP we are unable to get it.
1115 */
1116 if (!ic_proto_enabled) {
1117 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
1118 return -1;
1119 }
1120
1121#ifdef IPCONFIG_BOOTP
1122 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
1123 printk(KERN_ERR "DHCP/BOOTP: No suitable device found.\n");
1124#endif
1125#ifdef IPCONFIG_RARP
1126 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)
1127 printk(KERN_ERR "RARP: No suitable device found.\n");
1128#endif
1129
1130 if (!ic_proto_have_if)
1131 /* Error message already printed */
1132 return -1;
1133
1134 /*
1135 * Setup protocols
1136 */
1137#ifdef IPCONFIG_BOOTP
1138 if (do_bootp)
1139 ic_bootp_init();
1140#endif
1141#ifdef IPCONFIG_RARP
1142 if (do_rarp)
1143 ic_rarp_init();
1144#endif
1145
1146 /*
1147 * Send requests and wait, until we get an answer. This loop
1148 * seems to be a terrible waste of CPU time, but actually there is
1149 * only one process running at all, so we don't need to use any
1150 * scheduler functions.
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001151 * [Actually we could now, but the nothing else running note still
Linus Torvalds1da177e2005-04-16 15:20:36 -07001152 * applies.. - AC]
1153 */
1154 printk(KERN_NOTICE "Sending %s%s%s requests .",
1155 do_bootp
1156 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "",
1157 (do_bootp && do_rarp) ? " and " : "",
1158 do_rarp ? "RARP" : "");
1159
1160 start_jiffies = jiffies;
1161 d = ic_first_dev;
1162 retries = CONF_SEND_RETRIES;
1163 get_random_bytes(&timeout, sizeof(timeout));
1164 timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned) CONF_TIMEOUT_RANDOM);
Stephen Hemminger132adf52007-03-08 20:44:43 -08001165 for (;;) {
Chris Friesen2513dfb2009-05-17 20:39:33 -07001166 /* Track the device we are configuring */
1167 ic_dev_xid = d->xid;
1168
Linus Torvalds1da177e2005-04-16 15:20:36 -07001169#ifdef IPCONFIG_BOOTP
1170 if (do_bootp && (d->able & IC_BOOTP))
1171 ic_bootp_send_if(d, jiffies - start_jiffies);
1172#endif
1173#ifdef IPCONFIG_RARP
1174 if (do_rarp && (d->able & IC_RARP))
1175 ic_rarp_send_if(d);
1176#endif
1177
1178 jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout);
Nishanth Aravamudan121caf52005-09-12 14:15:34 -07001179 while (time_before(jiffies, jiff) && !ic_got_reply)
1180 schedule_timeout_uninterruptible(1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001181#ifdef IPCONFIG_DHCP
1182 /* DHCP isn't done until we get a DHCPACK. */
Joe Perches9d4fb272009-11-23 10:41:23 -08001183 if ((ic_got_reply & IC_BOOTP) &&
1184 (ic_proto_enabled & IC_USE_DHCP) &&
1185 ic_dhcp_msgtype != DHCPACK) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001186 ic_got_reply = 0;
1187 printk(",");
1188 continue;
1189 }
1190#endif /* IPCONFIG_DHCP */
1191
1192 if (ic_got_reply) {
1193 printk(" OK\n");
1194 break;
1195 }
1196
1197 if ((d = d->next))
1198 continue;
1199
1200 if (! --retries) {
1201 printk(" timed out!\n");
1202 break;
1203 }
1204
1205 d = ic_first_dev;
1206
1207 timeout = timeout CONF_TIMEOUT_MULT;
1208 if (timeout > CONF_TIMEOUT_MAX)
1209 timeout = CONF_TIMEOUT_MAX;
1210
1211 printk(".");
1212 }
1213
1214#ifdef IPCONFIG_BOOTP
1215 if (do_bootp)
1216 ic_bootp_cleanup();
1217#endif
1218#ifdef IPCONFIG_RARP
1219 if (do_rarp)
1220 ic_rarp_cleanup();
1221#endif
1222
Maxime Bizon7a1af5d2005-06-28 13:21:12 -07001223 if (!ic_got_reply) {
Al Viro5a874db2006-11-08 00:19:38 -08001224 ic_myaddr = NONE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001225 return -1;
Maxime Bizon7a1af5d2005-06-28 13:21:12 -07001226 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001227
Harvey Harrison673d57e2008-10-31 00:53:57 -07001228 printk("IP-Config: Got %s answer from %pI4, ",
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001229 ((ic_got_reply & IC_RARP) ? "RARP"
Linus Torvalds1da177e2005-04-16 15:20:36 -07001230 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),
Harvey Harrison673d57e2008-10-31 00:53:57 -07001231 &ic_servaddr);
1232 printk("my address is %pI4\n", &ic_myaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001233
1234 return 0;
1235}
1236
1237#endif /* IPCONFIG_DYNAMIC */
1238
1239#ifdef CONFIG_PROC_FS
1240
1241static int pnp_seq_show(struct seq_file *seq, void *v)
1242{
1243 int i;
1244
1245 if (ic_proto_used & IC_PROTO)
1246 seq_printf(seq, "#PROTO: %s\n",
1247 (ic_proto_used & IC_RARP) ? "RARP"
1248 : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP");
1249 else
1250 seq_puts(seq, "#MANUAL\n");
1251
1252 if (ic_domain[0])
1253 seq_printf(seq,
1254 "domain %s\n", ic_domain);
1255 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {
Al Viro5a874db2006-11-08 00:19:38 -08001256 if (ic_nameservers[i] != NONE)
Harvey Harrison673d57e2008-10-31 00:53:57 -07001257 seq_printf(seq, "nameserver %pI4\n",
1258 &ic_nameservers[i]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001259 }
Al Viro5a874db2006-11-08 00:19:38 -08001260 if (ic_servaddr != NONE)
Harvey Harrison673d57e2008-10-31 00:53:57 -07001261 seq_printf(seq, "bootserver %pI4\n",
1262 &ic_servaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001263 return 0;
1264}
1265
1266static int pnp_seq_open(struct inode *indoe, struct file *file)
1267{
1268 return single_open(file, pnp_seq_show, NULL);
1269}
1270
Arjan van de Ven9a321442007-02-12 00:55:35 -08001271static const struct file_operations pnp_seq_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001272 .owner = THIS_MODULE,
1273 .open = pnp_seq_open,
1274 .read = seq_read,
1275 .llseek = seq_lseek,
1276 .release = single_release,
1277};
1278#endif /* CONFIG_PROC_FS */
1279
1280/*
1281 * Extract IP address from the parameter string if needed. Note that we
1282 * need to have root_server_addr set _before_ IPConfig gets called as it
1283 * can override it.
1284 */
Al Viro5a874db2006-11-08 00:19:38 -08001285__be32 __init root_nfs_parse_addr(char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001286{
Al Viro5a874db2006-11-08 00:19:38 -08001287 __be32 addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001288 int octets = 0;
1289 char *cp, *cq;
1290
1291 cp = cq = name;
1292 while (octets < 4) {
1293 while (*cp >= '0' && *cp <= '9')
1294 cp++;
1295 if (cp == cq || cp - cq > 3)
1296 break;
1297 if (*cp == '.' || octets == 3)
1298 octets++;
1299 if (octets < 4)
1300 cp++;
1301 cq = cp;
1302 }
1303 if (octets == 4 && (*cp == ':' || *cp == '\0')) {
1304 if (*cp == ':')
1305 *cp++ = '\0';
1306 addr = in_aton(name);
1307 memmove(name, cp, strlen(cp) + 1);
1308 } else
Al Viro5a874db2006-11-08 00:19:38 -08001309 addr = NONE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001310
1311 return addr;
1312}
1313
David S. Miller964ad812010-03-12 00:00:17 -08001314#define DEVICE_WAIT_MAX 12 /* 12 seconds */
1315
1316static int __init wait_for_devices(void)
1317{
1318 int i;
1319
1320 msleep(CONF_PRE_OPEN);
1321 for (i = 0; i < DEVICE_WAIT_MAX; i++) {
1322 struct net_device *dev;
1323 int found = 0;
1324
1325 rtnl_lock();
1326 for_each_netdev(&init_net, dev) {
1327 if (ic_device_match(dev)) {
1328 found = 1;
1329 break;
1330 }
1331 }
1332 rtnl_unlock();
1333 if (found)
1334 return 0;
1335 ssleep(1);
1336 }
1337 return -ENODEV;
1338}
1339
Linus Torvalds1da177e2005-04-16 15:20:36 -07001340/*
1341 * IP Autoconfig dispatcher.
1342 */
1343
1344static int __init ip_auto_config(void)
1345{
Al Viro5a874db2006-11-08 00:19:38 -08001346 __be32 addr;
Benjamin Zores9d8dba62009-01-29 16:19:13 -08001347#ifdef IPCONFIG_DYNAMIC
1348 int retries = CONF_OPEN_RETRIES;
1349#endif
David S. Miller964ad812010-03-12 00:00:17 -08001350 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001351
1352#ifdef CONFIG_PROC_FS
Eric W. Biederman457c4cb2007-09-12 12:01:34 +02001353 proc_net_fops_create(&init_net, "pnp", S_IRUGO, &pnp_seq_fops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001354#endif /* CONFIG_PROC_FS */
1355
1356 if (!ic_enable)
1357 return 0;
1358
1359 DBG(("IP-Config: Entered.\n"));
1360#ifdef IPCONFIG_DYNAMIC
1361 try_try_again:
1362#endif
David S. Miller964ad812010-03-12 00:00:17 -08001363 /* Wait for devices to appear */
1364 err = wait_for_devices();
1365 if (err)
1366 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001367
1368 /* Setup all network devices */
David S. Miller964ad812010-03-12 00:00:17 -08001369 err = ic_open_devs();
1370 if (err)
1371 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001372
1373 /* Give drivers a chance to settle */
1374 ssleep(CONF_POST_OPEN);
1375
1376 /*
1377 * If the config information is insufficient (e.g., our IP address or
1378 * IP address of the boot server is missing or we have multiple network
1379 * interfaces and no default was set), use BOOTP or RARP to get the
1380 * missing values.
1381 */
Al Viro5a874db2006-11-08 00:19:38 -08001382 if (ic_myaddr == NONE ||
Linus Torvalds1da177e2005-04-16 15:20:36 -07001383#ifdef CONFIG_ROOT_NFS
Joe Perches9d4fb272009-11-23 10:41:23 -08001384 (root_server_addr == NONE &&
1385 ic_servaddr == NONE &&
1386 ROOT_DEV == Root_NFS) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -07001387#endif
1388 ic_first_dev->next) {
1389#ifdef IPCONFIG_DYNAMIC
Linus Torvalds1da177e2005-04-16 15:20:36 -07001390 if (ic_dynamic() < 0) {
1391 ic_close_devs();
1392
1393 /*
1394 * I don't know why, but sometimes the
1395 * eepro100 driver (at least) gets upset and
1396 * doesn't work the first time it's opened.
1397 * But then if you close it and reopen it, it
1398 * works just fine. So we need to try that at
1399 * least once before giving up.
1400 *
1401 * Also, if the root will be NFS-mounted, we
1402 * have nowhere to go if DHCP fails. So we
1403 * just have to keep trying forever.
1404 *
1405 * -- Chip
1406 */
1407#ifdef CONFIG_ROOT_NFS
1408 if (ROOT_DEV == Root_NFS) {
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001409 printk(KERN_ERR
Linus Torvalds1da177e2005-04-16 15:20:36 -07001410 "IP-Config: Retrying forever (NFS root)...\n");
1411 goto try_try_again;
1412 }
1413#endif
1414
1415 if (--retries) {
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001416 printk(KERN_ERR
Linus Torvalds1da177e2005-04-16 15:20:36 -07001417 "IP-Config: Reopening network devices...\n");
1418 goto try_try_again;
1419 }
1420
1421 /* Oh, well. At least we tried. */
1422 printk(KERN_ERR "IP-Config: Auto-configuration of network failed.\n");
1423 return -1;
1424 }
1425#else /* !DYNAMIC */
1426 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
1427 ic_close_devs();
1428 return -1;
1429#endif /* IPCONFIG_DYNAMIC */
1430 } else {
1431 /* Device selected manually or only one device -> use it */
1432 ic_dev = ic_first_dev->dev;
1433 }
1434
1435 addr = root_nfs_parse_addr(root_server_path);
Al Viro5a874db2006-11-08 00:19:38 -08001436 if (root_server_addr == NONE)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001437 root_server_addr = addr;
1438
1439 /*
1440 * Use defaults whereever applicable.
1441 */
1442 if (ic_defaults() < 0)
1443 return -1;
1444
1445 /*
1446 * Close all network devices except the device we've
1447 * autoconfigured and set up routes.
1448 */
1449 ic_close_devs();
1450 if (ic_setup_if() < 0 || ic_setup_routes() < 0)
1451 return -1;
1452
1453 /*
1454 * Record which protocol was actually used.
1455 */
1456#ifdef IPCONFIG_DYNAMIC
1457 ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP);
1458#endif
1459
1460#ifndef IPCONFIG_SILENT
1461 /*
1462 * Clue in the operator.
1463 */
1464 printk("IP-Config: Complete:");
Uwe Kleine-Koenig9c004092008-02-17 22:28:32 -08001465 printk("\n device=%s", ic_dev->name);
Harvey Harrison673d57e2008-10-31 00:53:57 -07001466 printk(", addr=%pI4", &ic_myaddr);
1467 printk(", mask=%pI4", &ic_netmask);
1468 printk(", gw=%pI4", &ic_gateway);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001469 printk(",\n host=%s, domain=%s, nis-domain=%s",
Serge E. Hallyne9ff3992006-10-02 02:18:11 -07001470 utsname()->nodename, ic_domain, utsname()->domainname);
Harvey Harrison673d57e2008-10-31 00:53:57 -07001471 printk(",\n bootserver=%pI4", &ic_servaddr);
1472 printk(", rootserver=%pI4", &root_server_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001473 printk(", rootpath=%s", root_server_path);
Chris Friesen9643f452009-05-19 15:31:50 -07001474 if (ic_dev_mtu)
1475 printk(", mtu=%d", ic_dev_mtu);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001476 printk("\n");
1477#endif /* !SILENT */
1478
1479 return 0;
1480}
1481
1482late_initcall(ip_auto_config);
1483
1484
1485/*
1486 * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
J. Bruce Fieldsdc7a0812009-10-27 14:41:35 -04001487 * command line parameter. See Documentation/filesystems/nfs/nfsroot.txt.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001488 */
1489static int __init ic_proto_name(char *name)
1490{
1491 if (!strcmp(name, "on") || !strcmp(name, "any")) {
1492 return 1;
1493 }
Simon Hormana6c05c32007-12-25 20:54:42 -08001494 if (!strcmp(name, "off") || !strcmp(name, "none")) {
Amos Waterland92ffb852008-01-05 23:23:06 -08001495 return 0;
Simon Hormana6c05c32007-12-25 20:54:42 -08001496 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001497#ifdef CONFIG_IP_PNP_DHCP
1498 else if (!strcmp(name, "dhcp")) {
1499 ic_proto_enabled &= ~IC_RARP;
1500 return 1;
1501 }
1502#endif
1503#ifdef CONFIG_IP_PNP_BOOTP
1504 else if (!strcmp(name, "bootp")) {
1505 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP);
1506 return 1;
1507 }
1508#endif
1509#ifdef CONFIG_IP_PNP_RARP
1510 else if (!strcmp(name, "rarp")) {
1511 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP);
1512 return 1;
1513 }
1514#endif
1515#ifdef IPCONFIG_DYNAMIC
1516 else if (!strcmp(name, "both")) {
1517 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */
1518 return 1;
1519 }
1520#endif
1521 return 0;
1522}
1523
1524static int __init ip_auto_config_setup(char *addrs)
1525{
1526 char *cp, *ip, *dp;
1527 int num = 0;
1528
1529 ic_set_manually = 1;
Simon Horman9cecd072007-12-27 21:19:10 -08001530 ic_enable = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001531
Amos Waterland92ffb852008-01-05 23:23:06 -08001532 /*
1533 * If any dhcp, bootp etc options are set, leave autoconfig on
1534 * and skip the below static IP processing.
1535 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001536 if (ic_proto_name(addrs))
1537 return 1;
1538
Amos Waterland92ffb852008-01-05 23:23:06 -08001539 /* If no static IP is given, turn off autoconfig and bail. */
1540 if (*addrs == 0 ||
1541 strcmp(addrs, "off") == 0 ||
1542 strcmp(addrs, "none") == 0) {
1543 ic_enable = 0;
1544 return 1;
1545 }
1546
1547 /* Parse string for static IP assignment. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001548 ip = addrs;
1549 while (ip && *ip) {
1550 if ((cp = strchr(ip, ':')))
1551 *cp++ = '\0';
1552 if (strlen(ip) > 0) {
1553 DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip));
1554 switch (num) {
1555 case 0:
Al Viroe6f1ceb2008-03-17 22:44:53 -07001556 if ((ic_myaddr = in_aton(ip)) == ANY)
Al Viro5a874db2006-11-08 00:19:38 -08001557 ic_myaddr = NONE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001558 break;
1559 case 1:
Al Viroe6f1ceb2008-03-17 22:44:53 -07001560 if ((ic_servaddr = in_aton(ip)) == ANY)
Al Viro5a874db2006-11-08 00:19:38 -08001561 ic_servaddr = NONE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001562 break;
1563 case 2:
Al Viroe6f1ceb2008-03-17 22:44:53 -07001564 if ((ic_gateway = in_aton(ip)) == ANY)
Al Viro5a874db2006-11-08 00:19:38 -08001565 ic_gateway = NONE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001566 break;
1567 case 3:
Al Viroe6f1ceb2008-03-17 22:44:53 -07001568 if ((ic_netmask = in_aton(ip)) == ANY)
Al Viro5a874db2006-11-08 00:19:38 -08001569 ic_netmask = NONE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001570 break;
1571 case 4:
1572 if ((dp = strchr(ip, '.'))) {
1573 *dp++ = '\0';
Serge E. Hallyne9ff3992006-10-02 02:18:11 -07001574 strlcpy(utsname()->domainname, dp,
1575 sizeof(utsname()->domainname));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001576 }
Serge E. Hallyne9ff3992006-10-02 02:18:11 -07001577 strlcpy(utsname()->nodename, ip,
1578 sizeof(utsname()->nodename));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001579 ic_host_name_set = 1;
1580 break;
1581 case 5:
1582 strlcpy(user_dev_name, ip, sizeof(user_dev_name));
1583 break;
1584 case 6:
Amos Waterland92ffb852008-01-05 23:23:06 -08001585 if (ic_proto_name(ip) == 0 &&
1586 ic_myaddr == NONE) {
1587 ic_enable = 0;
1588 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001589 break;
1590 }
1591 }
1592 ip = cp;
1593 num++;
1594 }
1595
1596 return 1;
1597}
1598
1599static int __init nfsaddrs_config_setup(char *addrs)
1600{
1601 return ip_auto_config_setup(addrs);
1602}
1603
Rainer Jochem62013db2007-11-14 02:18:39 -08001604static int __init vendor_class_identifier_setup(char *addrs)
1605{
1606 if (strlcpy(vendor_class_identifier, addrs,
1607 sizeof(vendor_class_identifier))
1608 >= sizeof(vendor_class_identifier))
1609 printk(KERN_WARNING "DHCP: vendorclass too long, truncated to \"%s\"",
1610 vendor_class_identifier);
1611 return 1;
1612}
1613
Linus Torvalds1da177e2005-04-16 15:20:36 -07001614__setup("ip=", ip_auto_config_setup);
1615__setup("nfsaddrs=", nfsaddrs_config_setup);
Rainer Jochem62013db2007-11-14 02:18:39 -08001616__setup("dhcpclass=", vendor_class_identifier_setup);