blob: 92ac7e7363a0624b6008ed5eaa6d35cccbd82544 [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>
Paul Gortmakerbc3b2d72011-07-15 11:47:34 -040057#include <linux/export.h>
Eric W. Biederman457c4cb2007-09-12 12:01:34 +020058#include <net/net_namespace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070059#include <net/arp.h>
60#include <net/ip.h>
61#include <net/ipconfig.h>
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020062#include <net/route.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070063
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 */
Micha Nelissen3fb72f12011-05-19 10:14:06 +000091#define CONF_POST_OPEN 10 /* After opening: 10 msecs */
92#define CONF_CARRIER_TIMEOUT 120000 /* Wait for carrier timeout */
Linus Torvalds1da177e2005-04-16 15:20:36 -070093
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 */
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900102#define CONF_NAMESERVERS_MAX 3 /* Maximum number of nameservers
103 - '3' from resolv.h */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104
Harvey Harrison09640e62009-02-01 00:45:17 -0800105#define NONE cpu_to_be32(INADDR_NONE)
106#define ANY cpu_to_be32(INADDR_ANY)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107
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
Al Viro5a874db2006-11-08 00:19:38 -0800135__be32 ic_myaddr = NONE; /* My IP address */
136static __be32 ic_netmask = NONE; /* Netmask for local subnet */
137__be32 ic_gateway = NONE; /* Gateway IP address */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138
Al Viro5a874db2006-11-08 00:19:38 -0800139__be32 ic_servaddr = NONE; /* Boot server IP address */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140
Al Viro5a874db2006-11-08 00:19:38 -0800141__be32 root_server_addr = NONE; /* Address of NFS server */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142u8 root_server_path[256] = { 0, }; /* Path to mount as root */
143
Eric Dumazet747465e2012-01-16 19:27:39 +0000144__be32 ic_dev_xid; /* Device under configuration */
Chris Friesen2513dfb2009-05-17 20:39:33 -0700145
David S. Miller1b0b04f2007-11-19 21:56:16 -0800146/* vendor class identifier */
147static char vendor_class_identifier[253] __initdata;
Rainer Jochem62013db2007-11-14 02:18:39 -0800148
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149/* Persistent data: */
150
151static int ic_proto_used; /* Protocol used, if any */
Al Viro5a874db2006-11-08 00:19:38 -0800152static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153static 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
Chris Friesen9643f452009-05-19 15:31:50 -0700165/* MTU for boot device */
166static int ic_dev_mtu __initdata = 0;
167
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168#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;
Al Viro5a874db2006-11-08 00:19:38 -0800186 __be32 xid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187};
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
Micha Nelissen3fb72f12011-05-19 10:14:06 +0000192static bool __init ic_is_init_dev(struct net_device *dev)
David S. Miller964ad812010-03-12 00:00:17 -0800193{
Micha Nelissen3fb72f12011-05-19 10:14:06 +0000194 if (dev->flags & IFF_LOOPBACK)
195 return false;
196 return user_dev_name[0] ? !strcmp(dev->name, user_dev_name) :
David S. Miller964ad812010-03-12 00:00:17 -0800197 (!(dev->flags & IFF_LOOPBACK) &&
198 (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) &&
Micha Nelissen3fb72f12011-05-19 10:14:06 +0000199 strncmp(dev->name, "dummy", 5));
David S. Miller964ad812010-03-12 00:00:17 -0800200}
201
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202static int __init ic_open_devs(void)
203{
204 struct ic_device *d, **last;
205 struct net_device *dev;
206 unsigned short oflags;
Micha Nelissen3fb72f12011-05-19 10:14:06 +0000207 unsigned long start;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208
209 last = &ic_first_dev;
Stephen Hemminger6756ae42006-03-20 22:23:58 -0800210 rtnl_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211
212 /* bring loopback device up first */
Eric W. Biederman0cc217e2007-09-26 22:10:06 -0700213 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)
Joe Perches058bd4d2012-03-11 18:36:11 +0000217 pr_err("IP-Config: Failed to open %s\n", dev->name);
Eric W. Biederman0cc217e2007-09-26 22:10:06 -0700218 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219
Eric W. Biederman881d9662007-09-17 11:56:21 -0700220 for_each_netdev(&init_net, dev) {
Micha Nelissen3fb72f12011-05-19 10:14:06 +0000221 if (ic_is_init_dev(dev)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222 int able = 0;
223 if (dev->mtu >= 364)
224 able |= IC_BOOTP;
225 else
Joe Perches058bd4d2012-03-11 18:36:11 +0000226 pr_warn("DHCP/BOOTP: Ignoring device %s, MTU %d too small",
227 dev->name, dev->mtu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 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) {
Joe Perches058bd4d2012-03-11 18:36:11 +0000235 pr_err("IP-Config: Failed to open %s\n",
236 dev->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237 continue;
238 }
239 if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) {
Stephen Hemminger6756ae42006-03-20 22:23:58 -0800240 rtnl_unlock();
David S. Miller964ad812010-03-12 00:00:17 -0800241 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242 }
243 d->dev = dev;
244 *last = d;
245 last = &d->next;
246 d->flags = oflags;
247 d->able = able;
248 if (able & IC_BOOTP)
Al Viro5a874db2006-11-08 00:19:38 -0800249 get_random_bytes(&d->xid, sizeof(__be32));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 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 }
Micha Nelissen3fb72f12011-05-19 10:14:06 +0000257
Gerlando Falautocd7816d2011-12-19 22:58:04 +0000258 /* no point in waiting if we could not bring up at least one device */
259 if (!ic_first_dev)
260 goto have_carrier;
261
Micha Nelissen3fb72f12011-05-19 10:14:06 +0000262 /* 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:
Stephen Hemminger6756ae42006-03-20 22:23:58 -0800272 rtnl_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273
274 *last = NULL;
275
276 if (!ic_first_dev) {
277 if (user_dev_name[0])
Joe Perches058bd4d2012-03-11 18:36:11 +0000278 pr_err("IP-Config: Device `%s' not found\n",
279 user_dev_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280 else
Joe Perches058bd4d2012-03-11 18:36:11 +0000281 pr_err("IP-Config: No network devices available\n");
David S. Miller964ad812010-03-12 00:00:17 -0800282 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283 }
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
Stephen Hemminger6756ae42006-03-20 22:23:58 -0800292 rtnl_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293 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 }
Stephen Hemminger6756ae42006-03-20 22:23:58 -0800303 rtnl_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304}
305
306/*
307 * Interface to various network functions.
308 */
309
310static inline void
Al Viro5a874db2006-11-08 00:19:38 -0800311set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312{
313 sin->sin_family = AF_INET;
314 sin->sin_addr.s_addr = addr;
315 sin->sin_port = port;
316}
317
Chris Friesen9643f452009-05-19 15:31:50 -0700318static int __init ic_devinet_ioctl(unsigned int cmd, struct ifreq *arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319{
320 int res;
321
322 mm_segment_t oldfs = get_fs();
323 set_fs(get_ds());
Denis V. Luneve5b13cb2008-02-28 20:51:43 -0800324 res = devinet_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325 set_fs(oldfs);
326 return res;
327}
328
Chris Friesen9643f452009-05-19 15:31:50 -0700329static 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340static 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());
Denis V. Lunev1bad1182008-01-10 03:29:53 -0800346 res = ip_rt_ioctl(&init_net, cmd, (void __user *) arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347 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);
Chris Friesen9643f452009-05-19 15:31:50 -0700364 if ((err = ic_devinet_ioctl(SIOCSIFADDR, &ir)) < 0) {
Joe Perches058bd4d2012-03-11 18:36:11 +0000365 pr_err("IP-Config: Unable to set interface address (%d)\n",
366 err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367 return -1;
368 }
369 set_sockaddr(sin, ic_netmask, 0);
Chris Friesen9643f452009-05-19 15:31:50 -0700370 if ((err = ic_devinet_ioctl(SIOCSIFNETMASK, &ir)) < 0) {
Joe Perches058bd4d2012-03-11 18:36:11 +0000371 pr_err("IP-Config: Unable to set interface netmask (%d)\n",
372 err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373 return -1;
374 }
375 set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0);
Chris Friesen9643f452009-05-19 15:31:50 -0700376 if ((err = ic_devinet_ioctl(SIOCSIFBRDADDR, &ir)) < 0) {
Joe Perches058bd4d2012-03-11 18:36:11 +0000377 pr_err("IP-Config: Unable to set interface broadcast address (%d)\n",
378 err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379 return -1;
380 }
Chris Friesen9643f452009-05-19 15:31:50 -0700381 /* 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)
Joe Perches058bd4d2012-03-11 18:36:11 +0000389 pr_err("IP-Config: Unable to set interface mtu to %d (%d)\n",
390 ic_dev_mtu, err);
Chris Friesen9643f452009-05-19 15:31:50 -0700391 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392 return 0;
393}
394
395static int __init ic_setup_routes(void)
396{
397 /* No need to setup device routes, only the default route... */
398
Al Viro5a874db2006-11-08 00:19:38 -0800399 if (ic_gateway != NONE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400 struct rtentry rm;
401 int err;
402
403 memset(&rm, 0, sizeof(rm));
404 if ((ic_gateway ^ ic_myaddr) & ic_netmask) {
Joe Perches058bd4d2012-03-11 18:36:11 +0000405 pr_err("IP-Config: Gateway not on directly connected network\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406 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) {
Joe Perches058bd4d2012-03-11 18:36:11 +0000413 pr_err("IP-Config: Cannot add default route (%d)\n",
414 err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 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 */
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900432
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433 if (!ic_host_name_set)
Harvey Harrison673d57e2008-10-31 00:53:57 -0700434 sprintf(init_utsname()->nodename, "%pI4", &ic_myaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435
Al Viro5a874db2006-11-08 00:19:38 -0800436 if (root_server_addr == NONE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437 root_server_addr = ic_servaddr;
438
Al Viro5a874db2006-11-08 00:19:38 -0800439 if (ic_netmask == NONE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440 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 {
Joe Perches058bd4d2012-03-11 18:36:11 +0000447 pr_err("IP-Config: Unable to guess netmask for address %pI4\n",
448 &ic_myaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449 return -1;
450 }
Harvey Harrison673d57e2008-10-31 00:53:57 -0700451 printk("IP-Config: Guessing netmask %pI4\n", &ic_netmask);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452 }
453
454 return 0;
455}
456
457/*
458 * RARP support.
459 */
460
461#ifdef IPCONFIG_RARP
462
David S. Millerf2ccd8f2005-08-09 19:34:12 -0700463static 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 -0700464
465static struct packet_type rarp_packet_type __initdata = {
Harvey Harrison09640e62009-02-01 00:45:17 -0800466 .type = cpu_to_be16(ETH_P_RARP),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467 .func = ic_rarp_recv,
468};
469
Sam Ravnborg45e741b2008-04-29 20:58:15 -0700470static inline void __init ic_rarp_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471{
472 dev_add_pack(&rarp_packet_type);
473}
474
Sam Ravnborg45e741b2008-04-29 20:58:15 -0700475static inline void __init ic_rarp_cleanup(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476{
477 dev_remove_pack(&rarp_packet_type);
478}
479
480/*
481 * Process received RARP packet.
482 */
483static int __init
David S. Millerf2ccd8f2005-08-09 19:34:12 -0700484ic_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 -0700485{
486 struct arphdr *rarp;
487 unsigned char *rarp_ptr;
Al Viro5a874db2006-11-08 00:19:38 -0800488 __be32 sip, tip;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489 unsigned char *sha, *tha; /* s for "source", t for "target" */
490 struct ic_device *d;
491
YOSHIFUJI Hideaki721499e2008-07-19 22:34:43 -0700492 if (!net_eq(dev_net(dev), &init_net))
Eric W. Biedermane730c152007-09-17 11:53:39 -0700493 goto drop;
494
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495 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. */
Arnaldo Carvalho de Melo9c702202007-04-25 18:04:18 -0700502 rarp = (struct arphdr *)skb_transport_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503
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
Pavel Emelyanov988b7052008-03-03 12:20:57 -0800518 if (!pskb_may_pull(skb, arp_hdr_len(dev)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519 goto drop;
520
521 /* OK, it is all there and looks valid, process... */
Arnaldo Carvalho de Melo9c702202007-04-25 18:04:18 -0700522 rarp = (struct arphdr *)skb_transport_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523 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. */
Al Viro5a874db2006-11-08 00:19:38 -0800553 if (ic_servaddr != NONE && ic_servaddr != sip)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554 goto drop_unlock;
555
556 /* We have a winner! */
557 ic_dev = dev;
Al Viro5a874db2006-11-08 00:19:38 -0800558 if (ic_myaddr == NONE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559 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 */
Al Viro5a874db2006-11-08 00:19:38 -0800598 __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 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605 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
David S. Millerf2ccd8f2005-08-09 19:34:12 -0700625static 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 -0700626
627static struct packet_type bootp_packet_type __initdata = {
Harvey Harrison09640e62009-02-01 00:45:17 -0800628 .type = cpu_to_be16(ETH_P_IP),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629 .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{
Al Viro5a874db2006-11-08 00:19:38 -0800644 u8 mt = ((ic_servaddr == NONE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700645 ? DHCPDISCOVER : DHCPREQUEST);
646 u8 *e = options;
Rainer Jochem62013db2007-11-14 02:18:39 -0800647 int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648
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 */
Chris Friesen9643f452009-05-19 15:31:50 -0700681 26, /* MTU */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700682 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);
Rainer Jochem62013db2007-11-14 02:18:39 -0800689
Wu Fengguang130c0f42010-05-30 17:19:53 +0000690 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 }
Rainer Jochem62013db2007-11-14 02:18:39 -0800697 if (*vendor_class_identifier) {
Joe Perches058bd4d2012-03-11 18:36:11 +0000698 pr_info("DHCP: sending class identifier \"%s\"\n",
699 vendor_class_identifier);
Rainer Jochem62013db2007-11-14 02:18:39 -0800700 *e++ = 60; /* Class-identifier */
701 len = strlen(vendor_class_identifier);
702 *e++ = len;
703 memcpy(e, vendor_class_identifier, len);
704 e += len;
705 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700706 }
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
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900736 *e++ = 57; /* set extension buffer size for reply */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700737 *e++ = 2;
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900738 *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700739 *e++ = 150;
740
741 *e++ = 255; /* End of the list */
742}
743
744
745/*
746 * Initialize the DHCP/BOOTP mechanism.
747 */
Sam Ravnborg45e741b2008-04-29 20:58:15 -0700748static inline void __init ic_bootp_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749{
750 int i;
751
752 for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
Al Viro5a874db2006-11-08 00:19:38 -0800753 ic_nameservers[i] = NONE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700754
755 dev_add_pack(&bootp_packet_type);
756}
757
758
759/*
760 * DHCP/BOOTP cleanup.
761 */
Sam Ravnborg45e741b2008-04-29 20:58:15 -0700762static inline void __init ic_bootp_cleanup(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763{
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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700776 struct iphdr *h;
Herbert Xu66088242011-11-18 02:20:04 +0000777 int hlen = LL_RESERVED_SPACE(dev);
778 int tlen = dev->needed_tailroom;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700779
780 /* Allocate packet */
Herbert Xu66088242011-11-18 02:20:04 +0000781 skb = alloc_skb(sizeof(struct bootp_pkt) + hlen + tlen + 15,
Johannes Bergf5184d22008-05-12 20:48:31 -0700782 GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700783 if (!skb)
784 return;
Herbert Xu66088242011-11-18 02:20:04 +0000785 skb_reserve(skb, hlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786 b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt));
787 memset(b, 0, sizeof(struct bootp_pkt));
788
789 /* Construct IP header */
Arnaldo Carvalho de Melo04b964d2007-03-10 19:27:27 -0300790 skb_reset_network_header(skb);
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700791 h = ip_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700792 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;
Al Viro5a874db2006-11-08 00:19:38 -0800798 h->daddr = htonl(INADDR_BROADCAST);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700799 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_IEEE802_TR) /* fix for token ring */
812 b->htype = ARPHRD_IEEE802;
813 else if (dev->type == ARPHRD_FDDI)
814 b->htype = ARPHRD_ETHER;
815 else {
816 printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name);
817 b->htype = dev->type; /* can cause undefined behavior */
818 }
Stephen Hemmingerdea75bd2008-03-04 17:03:49 -0800819
820 /* server_ip and your_ip address are both already zero per RFC2131 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821 b->hlen = dev->addr_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700822 memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
823 b->secs = htons(jiffies_diff / HZ);
824 b->xid = d->xid;
825
826 /* add DHCP options or BOOTP extensions */
827#ifdef IPCONFIG_DHCP
828 if (ic_proto_enabled & IC_USE_DHCP)
829 ic_dhcp_init_options(b->exten);
830 else
831#endif
832 ic_bootp_init_ext(b->exten);
833
834 /* Chain packet down the line... */
835 skb->dev = dev;
836 skb->protocol = htons(ETH_P_IP);
Stephen Hemminger0c4e8582007-10-09 01:36:32 -0700837 if (dev_hard_header(skb, dev, ntohs(skb->protocol),
RongQing.Liad79eef2011-11-14 14:37:24 -0500838 dev->broadcast, dev->dev_addr, skb->len) < 0) {
839 kfree_skb(skb);
840 printk("E");
841 return;
842 }
843
844 if (dev_queue_xmit(skb) < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700845 printk("E");
846}
847
848
849/*
850 * Copy BOOTP-supplied string if not already set.
851 */
852static int __init ic_bootp_string(char *dest, char *src, int len, int max)
853{
854 if (!len)
855 return 0;
856 if (len > max-1)
857 len = max-1;
858 memcpy(dest, src, len);
859 dest[len] = '\0';
860 return 1;
861}
862
863
864/*
865 * Process BOOTP extensions.
866 */
867static void __init ic_do_bootp_ext(u8 *ext)
868{
Eric Dumazet747465e2012-01-16 19:27:39 +0000869 u8 servers;
870 int i;
871 __be16 mtu;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700872
873#ifdef IPCONFIG_DEBUG
874 u8 *c;
875
876 printk("DHCP/BOOTP: Got extension %d:",*ext);
Stephen Hemminger132adf52007-03-08 20:44:43 -0800877 for (c=ext+2; c<ext+2+ext[1]; c++)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700878 printk(" %02x", *c);
879 printk("\n");
880#endif
881
882 switch (*ext++) {
Joe Perches1d67a512011-07-01 09:43:05 +0000883 case 1: /* Subnet mask */
884 if (ic_netmask == NONE)
885 memcpy(&ic_netmask, ext+1, 4);
886 break;
887 case 3: /* Default gateway */
888 if (ic_gateway == NONE)
889 memcpy(&ic_gateway, ext+1, 4);
890 break;
891 case 6: /* DNS server */
892 servers= *ext/4;
893 if (servers > CONF_NAMESERVERS_MAX)
894 servers = CONF_NAMESERVERS_MAX;
895 for (i = 0; i < servers; i++) {
896 if (ic_nameservers[i] == NONE)
897 memcpy(&ic_nameservers[i], ext+1+4*i, 4);
898 }
899 break;
900 case 12: /* Host name */
901 ic_bootp_string(utsname()->nodename, ext+1, *ext,
902 __NEW_UTS_LEN);
903 ic_host_name_set = 1;
904 break;
905 case 15: /* Domain name (DNS) */
906 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
907 break;
908 case 17: /* Root path */
909 if (!root_server_path[0])
910 ic_bootp_string(root_server_path, ext+1, *ext,
911 sizeof(root_server_path));
912 break;
913 case 26: /* Interface MTU */
914 memcpy(&mtu, ext+1, sizeof(mtu));
915 ic_dev_mtu = ntohs(mtu);
916 break;
917 case 40: /* NIS Domain name (_not_ DNS) */
918 ic_bootp_string(utsname()->domainname, ext+1, *ext,
919 __NEW_UTS_LEN);
920 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700921 }
922}
923
924
925/*
926 * Receive BOOTP reply.
927 */
David S. Millerf2ccd8f2005-08-09 19:34:12 -0700928static 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 -0700929{
930 struct bootp_pkt *b;
931 struct iphdr *h;
932 struct ic_device *d;
933 int len, ext_len;
934
YOSHIFUJI Hideaki721499e2008-07-19 22:34:43 -0700935 if (!net_eq(dev_net(dev), &init_net))
Eric W. Biedermane730c152007-09-17 11:53:39 -0700936 goto drop;
937
Linus Torvalds1da177e2005-04-16 15:20:36 -0700938 /* Perform verifications before taking the lock. */
939 if (skb->pkt_type == PACKET_OTHERHOST)
940 goto drop;
941
942 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
943 return NET_RX_DROP;
944
945 if (!pskb_may_pull(skb,
946 sizeof(struct iphdr) +
947 sizeof(struct udphdr)))
948 goto drop;
949
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700950 b = (struct bootp_pkt *)skb_network_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700951 h = &b->iph;
952
953 if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP)
954 goto drop;
955
956 /* Fragments are not supported */
Paul Gortmaker56f8a752011-06-21 20:33:34 -0700957 if (ip_is_fragment(h)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700958 if (net_ratelimit())
Joe Perches058bd4d2012-03-11 18:36:11 +0000959 pr_err("DHCP/BOOTP: Ignoring fragmented reply\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700960 goto drop;
961 }
962
963 if (skb->len < ntohs(h->tot_len))
964 goto drop;
965
966 if (ip_fast_csum((char *) h, h->ihl))
967 goto drop;
968
969 if (b->udph.source != htons(67) || b->udph.dest != htons(68))
970 goto drop;
971
972 if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
973 goto drop;
974
975 len = ntohs(b->udph.len) - sizeof(struct udphdr);
976 ext_len = len - (sizeof(*b) -
977 sizeof(struct iphdr) -
978 sizeof(struct udphdr) -
979 sizeof(b->exten));
980 if (ext_len < 0)
981 goto drop;
982
983 /* Ok the front looks good, make sure we can get at the rest. */
984 if (!pskb_may_pull(skb, skb->len))
985 goto drop;
986
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700987 b = (struct bootp_pkt *)skb_network_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700988 h = &b->iph;
989
990 /* One reply at a time, please. */
991 spin_lock(&ic_recv_lock);
992
993 /* If we already have a reply, just drop the packet */
994 if (ic_got_reply)
995 goto drop_unlock;
996
997 /* Find the ic_device that the packet arrived on */
998 d = ic_first_dev;
999 while (d && d->dev != dev)
1000 d = d->next;
1001 if (!d)
1002 goto drop_unlock; /* should never happen */
1003
1004 /* Is it a reply to our BOOTP request? */
1005 if (b->op != BOOTP_REPLY ||
1006 b->xid != d->xid) {
1007 if (net_ratelimit())
Joe Perches058bd4d2012-03-11 18:36:11 +00001008 pr_err("DHCP/BOOTP: Reply not for us, op[%x] xid[%x]\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001009 b->op, b->xid);
1010 goto drop_unlock;
1011 }
1012
Chris Friesen2513dfb2009-05-17 20:39:33 -07001013 /* Is it a reply for the device we are configuring? */
1014 if (b->xid != ic_dev_xid) {
1015 if (net_ratelimit())
Joe Perches058bd4d2012-03-11 18:36:11 +00001016 pr_err("DHCP/BOOTP: Ignoring delayed packet\n");
Chris Friesen2513dfb2009-05-17 20:39:33 -07001017 goto drop_unlock;
1018 }
1019
Linus Torvalds1da177e2005-04-16 15:20:36 -07001020 /* Parse extensions */
1021 if (ext_len >= 4 &&
1022 !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001023 u8 *end = (u8 *) b + ntohs(b->iph.tot_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001024 u8 *ext;
1025
1026#ifdef IPCONFIG_DHCP
1027 if (ic_proto_enabled & IC_USE_DHCP) {
Al Viro5a874db2006-11-08 00:19:38 -08001028 __be32 server_id = NONE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001029 int mt = 0;
1030
1031 ext = &b->exten[4];
1032 while (ext < end && *ext != 0xff) {
1033 u8 *opt = ext++;
1034 if (*opt == 0) /* Padding */
1035 continue;
1036 ext += *ext + 1;
1037 if (ext >= end)
1038 break;
1039 switch (*opt) {
1040 case 53: /* Message type */
1041 if (opt[1])
1042 mt = opt[2];
1043 break;
1044 case 54: /* Server ID (IP address) */
1045 if (opt[1] >= 4)
1046 memcpy(&server_id, opt + 2, 4);
1047 break;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -07001048 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001049 }
1050
1051#ifdef IPCONFIG_DEBUG
1052 printk("DHCP: Got message type %d\n", mt);
1053#endif
1054
1055 switch (mt) {
1056 case DHCPOFFER:
1057 /* While in the process of accepting one offer,
1058 * ignore all others.
1059 */
Al Viro5a874db2006-11-08 00:19:38 -08001060 if (ic_myaddr != NONE)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001061 goto drop_unlock;
1062
1063 /* Let's accept that offer. */
1064 ic_myaddr = b->your_ip;
1065 ic_servaddr = server_id;
1066#ifdef IPCONFIG_DEBUG
Harvey Harrison673d57e2008-10-31 00:53:57 -07001067 printk("DHCP: Offered address %pI4 by server %pI4\n",
1068 &ic_myaddr, &ic_servaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001069#endif
1070 /* The DHCP indicated server address takes
1071 * precedence over the bootp header one if
1072 * they are different.
1073 */
Al Viro5a874db2006-11-08 00:19:38 -08001074 if ((server_id != NONE) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -07001075 (b->server_ip != server_id))
1076 b->server_ip = ic_servaddr;
1077 break;
1078
1079 case DHCPACK:
1080 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0)
1081 goto drop_unlock;
1082
1083 /* Yeah! */
1084 break;
1085
1086 default:
1087 /* Urque. Forget it*/
Al Viro5a874db2006-11-08 00:19:38 -08001088 ic_myaddr = NONE;
1089 ic_servaddr = NONE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001090 goto drop_unlock;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -07001091 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001092
1093 ic_dhcp_msgtype = mt;
1094
1095 }
1096#endif /* IPCONFIG_DHCP */
1097
1098 ext = &b->exten[4];
1099 while (ext < end && *ext != 0xff) {
1100 u8 *opt = ext++;
1101 if (*opt == 0) /* Padding */
1102 continue;
1103 ext += *ext + 1;
1104 if (ext < end)
1105 ic_do_bootp_ext(opt);
1106 }
1107 }
1108
1109 /* We have a winner! */
1110 ic_dev = dev;
1111 ic_myaddr = b->your_ip;
1112 ic_servaddr = b->server_ip;
Al Viro5a874db2006-11-08 00:19:38 -08001113 if (ic_gateway == NONE && b->relay_ip)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001114 ic_gateway = b->relay_ip;
Al Viro5a874db2006-11-08 00:19:38 -08001115 if (ic_nameservers[0] == NONE)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001116 ic_nameservers[0] = ic_servaddr;
1117 ic_got_reply = IC_BOOTP;
1118
1119drop_unlock:
1120 /* Show's over. Nothing to see here. */
1121 spin_unlock(&ic_recv_lock);
1122
1123drop:
1124 /* Throw the packet out. */
1125 kfree_skb(skb);
1126
1127 return 0;
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001128}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001129
1130
1131#endif
1132
1133
1134/*
1135 * Dynamic IP configuration -- DHCP, BOOTP, RARP.
1136 */
1137
1138#ifdef IPCONFIG_DYNAMIC
1139
1140static int __init ic_dynamic(void)
1141{
1142 int retries;
1143 struct ic_device *d;
1144 unsigned long start_jiffies, timeout, jiff;
1145 int do_bootp = ic_proto_have_if & IC_BOOTP;
1146 int do_rarp = ic_proto_have_if & IC_RARP;
1147
1148 /*
1149 * If none of DHCP/BOOTP/RARP was selected, return with an error.
1150 * This routine gets only called when some pieces of information
1151 * are missing, and without DHCP/BOOTP/RARP we are unable to get it.
1152 */
1153 if (!ic_proto_enabled) {
Joe Perches058bd4d2012-03-11 18:36:11 +00001154 pr_err("IP-Config: Incomplete network configuration information\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001155 return -1;
1156 }
1157
1158#ifdef IPCONFIG_BOOTP
1159 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
Joe Perches058bd4d2012-03-11 18:36:11 +00001160 pr_err("DHCP/BOOTP: No suitable device found\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001161#endif
1162#ifdef IPCONFIG_RARP
1163 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)
Joe Perches058bd4d2012-03-11 18:36:11 +00001164 pr_err("RARP: No suitable device found\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001165#endif
1166
1167 if (!ic_proto_have_if)
1168 /* Error message already printed */
1169 return -1;
1170
1171 /*
1172 * Setup protocols
1173 */
1174#ifdef IPCONFIG_BOOTP
1175 if (do_bootp)
1176 ic_bootp_init();
1177#endif
1178#ifdef IPCONFIG_RARP
1179 if (do_rarp)
1180 ic_rarp_init();
1181#endif
1182
1183 /*
1184 * Send requests and wait, until we get an answer. This loop
1185 * seems to be a terrible waste of CPU time, but actually there is
1186 * only one process running at all, so we don't need to use any
1187 * scheduler functions.
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001188 * [Actually we could now, but the nothing else running note still
Linus Torvalds1da177e2005-04-16 15:20:36 -07001189 * applies.. - AC]
1190 */
Joe Perches058bd4d2012-03-11 18:36:11 +00001191 pr_notice("Sending %s%s%s requests .",
1192 do_bootp
1193 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "",
1194 (do_bootp && do_rarp) ? " and " : "",
1195 do_rarp ? "RARP" : "");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001196
1197 start_jiffies = jiffies;
1198 d = ic_first_dev;
1199 retries = CONF_SEND_RETRIES;
1200 get_random_bytes(&timeout, sizeof(timeout));
1201 timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned) CONF_TIMEOUT_RANDOM);
Stephen Hemminger132adf52007-03-08 20:44:43 -08001202 for (;;) {
Chris Friesen2513dfb2009-05-17 20:39:33 -07001203 /* Track the device we are configuring */
1204 ic_dev_xid = d->xid;
1205
Linus Torvalds1da177e2005-04-16 15:20:36 -07001206#ifdef IPCONFIG_BOOTP
1207 if (do_bootp && (d->able & IC_BOOTP))
1208 ic_bootp_send_if(d, jiffies - start_jiffies);
1209#endif
1210#ifdef IPCONFIG_RARP
1211 if (do_rarp && (d->able & IC_RARP))
1212 ic_rarp_send_if(d);
1213#endif
1214
1215 jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout);
Nishanth Aravamudan121caf52005-09-12 14:15:34 -07001216 while (time_before(jiffies, jiff) && !ic_got_reply)
1217 schedule_timeout_uninterruptible(1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001218#ifdef IPCONFIG_DHCP
1219 /* DHCP isn't done until we get a DHCPACK. */
Joe Perches9d4fb272009-11-23 10:41:23 -08001220 if ((ic_got_reply & IC_BOOTP) &&
1221 (ic_proto_enabled & IC_USE_DHCP) &&
1222 ic_dhcp_msgtype != DHCPACK) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001223 ic_got_reply = 0;
Joe Perches058bd4d2012-03-11 18:36:11 +00001224 pr_cont(",");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001225 continue;
1226 }
1227#endif /* IPCONFIG_DHCP */
1228
1229 if (ic_got_reply) {
Joe Perches058bd4d2012-03-11 18:36:11 +00001230 pr_cont(" OK\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001231 break;
1232 }
1233
1234 if ((d = d->next))
1235 continue;
1236
1237 if (! --retries) {
Joe Perches058bd4d2012-03-11 18:36:11 +00001238 pr_cont(" timed out!\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001239 break;
1240 }
1241
1242 d = ic_first_dev;
1243
1244 timeout = timeout CONF_TIMEOUT_MULT;
1245 if (timeout > CONF_TIMEOUT_MAX)
1246 timeout = CONF_TIMEOUT_MAX;
1247
Joe Perches058bd4d2012-03-11 18:36:11 +00001248 pr_cont(".");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001249 }
1250
1251#ifdef IPCONFIG_BOOTP
1252 if (do_bootp)
1253 ic_bootp_cleanup();
1254#endif
1255#ifdef IPCONFIG_RARP
1256 if (do_rarp)
1257 ic_rarp_cleanup();
1258#endif
1259
Maxime Bizon7a1af5d2005-06-28 13:21:12 -07001260 if (!ic_got_reply) {
Al Viro5a874db2006-11-08 00:19:38 -08001261 ic_myaddr = NONE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001262 return -1;
Maxime Bizon7a1af5d2005-06-28 13:21:12 -07001263 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001264
Harvey Harrison673d57e2008-10-31 00:53:57 -07001265 printk("IP-Config: Got %s answer from %pI4, ",
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001266 ((ic_got_reply & IC_RARP) ? "RARP"
Linus Torvalds1da177e2005-04-16 15:20:36 -07001267 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),
Joe Perches058bd4d2012-03-11 18:36:11 +00001268 &ic_servaddr);
1269 pr_cont("my address is %pI4\n", &ic_myaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001270
1271 return 0;
1272}
1273
1274#endif /* IPCONFIG_DYNAMIC */
1275
1276#ifdef CONFIG_PROC_FS
1277
1278static int pnp_seq_show(struct seq_file *seq, void *v)
1279{
1280 int i;
1281
1282 if (ic_proto_used & IC_PROTO)
1283 seq_printf(seq, "#PROTO: %s\n",
1284 (ic_proto_used & IC_RARP) ? "RARP"
1285 : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP");
1286 else
1287 seq_puts(seq, "#MANUAL\n");
1288
1289 if (ic_domain[0])
1290 seq_printf(seq,
1291 "domain %s\n", ic_domain);
1292 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {
Al Viro5a874db2006-11-08 00:19:38 -08001293 if (ic_nameservers[i] != NONE)
Harvey Harrison673d57e2008-10-31 00:53:57 -07001294 seq_printf(seq, "nameserver %pI4\n",
1295 &ic_nameservers[i]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001296 }
Al Viro5a874db2006-11-08 00:19:38 -08001297 if (ic_servaddr != NONE)
Harvey Harrison673d57e2008-10-31 00:53:57 -07001298 seq_printf(seq, "bootserver %pI4\n",
1299 &ic_servaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001300 return 0;
1301}
1302
1303static int pnp_seq_open(struct inode *indoe, struct file *file)
1304{
1305 return single_open(file, pnp_seq_show, NULL);
1306}
1307
Arjan van de Ven9a321442007-02-12 00:55:35 -08001308static const struct file_operations pnp_seq_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001309 .owner = THIS_MODULE,
1310 .open = pnp_seq_open,
1311 .read = seq_read,
1312 .llseek = seq_lseek,
1313 .release = single_release,
1314};
1315#endif /* CONFIG_PROC_FS */
1316
1317/*
1318 * Extract IP address from the parameter string if needed. Note that we
1319 * need to have root_server_addr set _before_ IPConfig gets called as it
1320 * can override it.
1321 */
Al Viro5a874db2006-11-08 00:19:38 -08001322__be32 __init root_nfs_parse_addr(char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001323{
Al Viro5a874db2006-11-08 00:19:38 -08001324 __be32 addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001325 int octets = 0;
1326 char *cp, *cq;
1327
1328 cp = cq = name;
1329 while (octets < 4) {
1330 while (*cp >= '0' && *cp <= '9')
1331 cp++;
1332 if (cp == cq || cp - cq > 3)
1333 break;
1334 if (*cp == '.' || octets == 3)
1335 octets++;
1336 if (octets < 4)
1337 cp++;
1338 cq = cp;
1339 }
1340 if (octets == 4 && (*cp == ':' || *cp == '\0')) {
1341 if (*cp == ':')
1342 *cp++ = '\0';
1343 addr = in_aton(name);
1344 memmove(name, cp, strlen(cp) + 1);
1345 } else
Al Viro5a874db2006-11-08 00:19:38 -08001346 addr = NONE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001347
1348 return addr;
1349}
1350
David S. Miller964ad812010-03-12 00:00:17 -08001351#define DEVICE_WAIT_MAX 12 /* 12 seconds */
1352
1353static int __init wait_for_devices(void)
1354{
1355 int i;
1356
David S. Miller964ad812010-03-12 00:00:17 -08001357 for (i = 0; i < DEVICE_WAIT_MAX; i++) {
1358 struct net_device *dev;
1359 int found = 0;
1360
1361 rtnl_lock();
1362 for_each_netdev(&init_net, dev) {
Micha Nelissen3fb72f12011-05-19 10:14:06 +00001363 if (ic_is_init_dev(dev)) {
David S. Miller964ad812010-03-12 00:00:17 -08001364 found = 1;
1365 break;
1366 }
1367 }
1368 rtnl_unlock();
1369 if (found)
1370 return 0;
1371 ssleep(1);
1372 }
1373 return -ENODEV;
1374}
1375
Linus Torvalds1da177e2005-04-16 15:20:36 -07001376/*
1377 * IP Autoconfig dispatcher.
1378 */
1379
1380static int __init ip_auto_config(void)
1381{
Al Viro5a874db2006-11-08 00:19:38 -08001382 __be32 addr;
Benjamin Zores9d8dba62009-01-29 16:19:13 -08001383#ifdef IPCONFIG_DYNAMIC
1384 int retries = CONF_OPEN_RETRIES;
1385#endif
David S. Miller964ad812010-03-12 00:00:17 -08001386 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001387
1388#ifdef CONFIG_PROC_FS
Eric W. Biederman457c4cb2007-09-12 12:01:34 +02001389 proc_net_fops_create(&init_net, "pnp", S_IRUGO, &pnp_seq_fops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001390#endif /* CONFIG_PROC_FS */
1391
1392 if (!ic_enable)
1393 return 0;
1394
1395 DBG(("IP-Config: Entered.\n"));
1396#ifdef IPCONFIG_DYNAMIC
1397 try_try_again:
1398#endif
David S. Miller964ad812010-03-12 00:00:17 -08001399 /* Wait for devices to appear */
1400 err = wait_for_devices();
1401 if (err)
1402 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001403
1404 /* Setup all network devices */
David S. Miller964ad812010-03-12 00:00:17 -08001405 err = ic_open_devs();
1406 if (err)
1407 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001408
1409 /* Give drivers a chance to settle */
Micha Nelissen3fb72f12011-05-19 10:14:06 +00001410 msleep(CONF_POST_OPEN);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001411
1412 /*
1413 * If the config information is insufficient (e.g., our IP address or
1414 * IP address of the boot server is missing or we have multiple network
1415 * interfaces and no default was set), use BOOTP or RARP to get the
1416 * missing values.
1417 */
Al Viro5a874db2006-11-08 00:19:38 -08001418 if (ic_myaddr == NONE ||
Linus Torvalds1da177e2005-04-16 15:20:36 -07001419#ifdef CONFIG_ROOT_NFS
Joe Perches9d4fb272009-11-23 10:41:23 -08001420 (root_server_addr == NONE &&
1421 ic_servaddr == NONE &&
1422 ROOT_DEV == Root_NFS) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -07001423#endif
1424 ic_first_dev->next) {
1425#ifdef IPCONFIG_DYNAMIC
Linus Torvalds1da177e2005-04-16 15:20:36 -07001426 if (ic_dynamic() < 0) {
1427 ic_close_devs();
1428
1429 /*
1430 * I don't know why, but sometimes the
1431 * eepro100 driver (at least) gets upset and
1432 * doesn't work the first time it's opened.
1433 * But then if you close it and reopen it, it
1434 * works just fine. So we need to try that at
1435 * least once before giving up.
1436 *
1437 * Also, if the root will be NFS-mounted, we
1438 * have nowhere to go if DHCP fails. So we
1439 * just have to keep trying forever.
1440 *
1441 * -- Chip
1442 */
1443#ifdef CONFIG_ROOT_NFS
1444 if (ROOT_DEV == Root_NFS) {
Joe Perches058bd4d2012-03-11 18:36:11 +00001445 pr_err("IP-Config: Retrying forever (NFS root)...\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001446 goto try_try_again;
1447 }
1448#endif
1449
1450 if (--retries) {
Joe Perches058bd4d2012-03-11 18:36:11 +00001451 pr_err("IP-Config: Reopening network devices...\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001452 goto try_try_again;
1453 }
1454
1455 /* Oh, well. At least we tried. */
Joe Perches058bd4d2012-03-11 18:36:11 +00001456 pr_err("IP-Config: Auto-configuration of network failed\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001457 return -1;
1458 }
1459#else /* !DYNAMIC */
Joe Perches058bd4d2012-03-11 18:36:11 +00001460 pr_err("IP-Config: Incomplete network configuration information\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001461 ic_close_devs();
1462 return -1;
1463#endif /* IPCONFIG_DYNAMIC */
1464 } else {
1465 /* Device selected manually or only one device -> use it */
1466 ic_dev = ic_first_dev->dev;
1467 }
1468
1469 addr = root_nfs_parse_addr(root_server_path);
Al Viro5a874db2006-11-08 00:19:38 -08001470 if (root_server_addr == NONE)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001471 root_server_addr = addr;
1472
1473 /*
Lucas De Marchi25985ed2011-03-30 22:57:33 -03001474 * Use defaults wherever applicable.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001475 */
1476 if (ic_defaults() < 0)
1477 return -1;
1478
1479 /*
1480 * Close all network devices except the device we've
1481 * autoconfigured and set up routes.
1482 */
1483 ic_close_devs();
1484 if (ic_setup_if() < 0 || ic_setup_routes() < 0)
1485 return -1;
1486
1487 /*
1488 * Record which protocol was actually used.
1489 */
1490#ifdef IPCONFIG_DYNAMIC
1491 ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP);
1492#endif
1493
1494#ifndef IPCONFIG_SILENT
1495 /*
1496 * Clue in the operator.
1497 */
Joe Perches058bd4d2012-03-11 18:36:11 +00001498 pr_info("IP-Config: Complete:\n");
1499 pr_info(" device=%s, addr=%pI4, mask=%pI4, gw=%pI4\n",
1500 ic_dev->name, &ic_myaddr, &ic_netmask, &ic_gateway);
1501 pr_info(" host=%s, domain=%s, nis-domain=%s\n",
1502 utsname()->nodename, ic_domain, utsname()->domainname);
1503 pr_info(" bootserver=%pI4, rootserver=%pI4, rootpath=%s",
1504 &ic_servaddr, &root_server_addr, root_server_path);
Chris Friesen9643f452009-05-19 15:31:50 -07001505 if (ic_dev_mtu)
Joe Perches058bd4d2012-03-11 18:36:11 +00001506 pr_cont(", mtu=%d", ic_dev_mtu);
1507 pr_cont("\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001508#endif /* !SILENT */
1509
1510 return 0;
1511}
1512
1513late_initcall(ip_auto_config);
1514
1515
1516/*
1517 * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
J. Bruce Fieldsdc7a0812009-10-27 14:41:35 -04001518 * command line parameter. See Documentation/filesystems/nfs/nfsroot.txt.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001519 */
1520static int __init ic_proto_name(char *name)
1521{
1522 if (!strcmp(name, "on") || !strcmp(name, "any")) {
1523 return 1;
1524 }
Simon Hormana6c05c32007-12-25 20:54:42 -08001525 if (!strcmp(name, "off") || !strcmp(name, "none")) {
Amos Waterland92ffb852008-01-05 23:23:06 -08001526 return 0;
Simon Hormana6c05c32007-12-25 20:54:42 -08001527 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001528#ifdef CONFIG_IP_PNP_DHCP
1529 else if (!strcmp(name, "dhcp")) {
1530 ic_proto_enabled &= ~IC_RARP;
1531 return 1;
1532 }
1533#endif
1534#ifdef CONFIG_IP_PNP_BOOTP
1535 else if (!strcmp(name, "bootp")) {
1536 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP);
1537 return 1;
1538 }
1539#endif
1540#ifdef CONFIG_IP_PNP_RARP
1541 else if (!strcmp(name, "rarp")) {
1542 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP);
1543 return 1;
1544 }
1545#endif
1546#ifdef IPCONFIG_DYNAMIC
1547 else if (!strcmp(name, "both")) {
1548 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */
1549 return 1;
1550 }
1551#endif
1552 return 0;
1553}
1554
1555static int __init ip_auto_config_setup(char *addrs)
1556{
1557 char *cp, *ip, *dp;
1558 int num = 0;
1559
1560 ic_set_manually = 1;
Simon Horman9cecd072007-12-27 21:19:10 -08001561 ic_enable = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001562
Amos Waterland92ffb852008-01-05 23:23:06 -08001563 /*
1564 * If any dhcp, bootp etc options are set, leave autoconfig on
1565 * and skip the below static IP processing.
1566 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001567 if (ic_proto_name(addrs))
1568 return 1;
1569
Amos Waterland92ffb852008-01-05 23:23:06 -08001570 /* If no static IP is given, turn off autoconfig and bail. */
1571 if (*addrs == 0 ||
1572 strcmp(addrs, "off") == 0 ||
1573 strcmp(addrs, "none") == 0) {
1574 ic_enable = 0;
1575 return 1;
1576 }
1577
1578 /* Parse string for static IP assignment. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001579 ip = addrs;
1580 while (ip && *ip) {
1581 if ((cp = strchr(ip, ':')))
1582 *cp++ = '\0';
1583 if (strlen(ip) > 0) {
1584 DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip));
1585 switch (num) {
1586 case 0:
Al Viroe6f1ceb2008-03-17 22:44:53 -07001587 if ((ic_myaddr = in_aton(ip)) == ANY)
Al Viro5a874db2006-11-08 00:19:38 -08001588 ic_myaddr = NONE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001589 break;
1590 case 1:
Al Viroe6f1ceb2008-03-17 22:44:53 -07001591 if ((ic_servaddr = in_aton(ip)) == ANY)
Al Viro5a874db2006-11-08 00:19:38 -08001592 ic_servaddr = NONE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001593 break;
1594 case 2:
Al Viroe6f1ceb2008-03-17 22:44:53 -07001595 if ((ic_gateway = in_aton(ip)) == ANY)
Al Viro5a874db2006-11-08 00:19:38 -08001596 ic_gateway = NONE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001597 break;
1598 case 3:
Al Viroe6f1ceb2008-03-17 22:44:53 -07001599 if ((ic_netmask = in_aton(ip)) == ANY)
Al Viro5a874db2006-11-08 00:19:38 -08001600 ic_netmask = NONE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001601 break;
1602 case 4:
1603 if ((dp = strchr(ip, '.'))) {
1604 *dp++ = '\0';
Serge E. Hallyne9ff3992006-10-02 02:18:11 -07001605 strlcpy(utsname()->domainname, dp,
1606 sizeof(utsname()->domainname));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001607 }
Serge E. Hallyne9ff3992006-10-02 02:18:11 -07001608 strlcpy(utsname()->nodename, ip,
1609 sizeof(utsname()->nodename));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001610 ic_host_name_set = 1;
1611 break;
1612 case 5:
1613 strlcpy(user_dev_name, ip, sizeof(user_dev_name));
1614 break;
1615 case 6:
Amos Waterland92ffb852008-01-05 23:23:06 -08001616 if (ic_proto_name(ip) == 0 &&
1617 ic_myaddr == NONE) {
1618 ic_enable = 0;
1619 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001620 break;
1621 }
1622 }
1623 ip = cp;
1624 num++;
1625 }
1626
1627 return 1;
1628}
1629
1630static int __init nfsaddrs_config_setup(char *addrs)
1631{
1632 return ip_auto_config_setup(addrs);
1633}
1634
Rainer Jochem62013db2007-11-14 02:18:39 -08001635static int __init vendor_class_identifier_setup(char *addrs)
1636{
1637 if (strlcpy(vendor_class_identifier, addrs,
1638 sizeof(vendor_class_identifier))
1639 >= sizeof(vendor_class_identifier))
Joe Perches058bd4d2012-03-11 18:36:11 +00001640 pr_warn("DHCP: vendorclass too long, truncated to \"%s\"",
1641 vendor_class_identifier);
Rainer Jochem62013db2007-11-14 02:18:39 -08001642 return 1;
1643}
1644
Linus Torvalds1da177e2005-04-16 15:20:36 -07001645__setup("ip=", ip_auto_config_setup);
1646__setup("nfsaddrs=", nfsaddrs_config_setup);
Rainer Jochem62013db2007-11-14 02:18:39 -08001647__setup("dhcpclass=", vendor_class_identifier_setup);