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Commit | Line | Data |
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1da177e4 | 1 | /* |
1da177e4 LT |
2 | * Automatic Configuration of IP -- use DHCP, BOOTP, RARP, or |
3 | * user-supplied information to configure own IP address and routes. | |
4 | * | |
5 | * Copyright (C) 1996-1998 Martin Mares <mj@atrey.karlin.mff.cuni.cz> | |
6 | * | |
7 | * Derived from network configuration code in fs/nfs/nfsroot.c, | |
8 | * originally Copyright (C) 1995, 1996 Gero Kuhlmann and me. | |
9 | * | |
10 | * BOOTP rewritten to construct and analyse packets itself instead | |
11 | * of misusing the IP layer. num_bugs_causing_wrong_arp_replies--; | |
12 | * -- MJ, December 1998 | |
e905a9ed | 13 | * |
1da177e4 LT |
14 | * Fixed ip_auto_config_setup calling at startup in the new "Linker Magic" |
15 | * initialization scheme. | |
16 | * - Arnaldo Carvalho de Melo <acme@conectiva.com.br>, 08/11/1999 | |
17 | * | |
18 | * DHCP support added. To users this looks like a whole separate | |
19 | * protocol, but we know it's just a bag on the side of BOOTP. | |
20 | * -- Chip Salzenberg <chip@valinux.com>, May 2000 | |
21 | * | |
22 | * Ported DHCP support from 2.2.16 to 2.4.0-test4 | |
23 | * -- Eric Biederman <ebiederman@lnxi.com>, 30 Aug 2000 | |
24 | * | |
25 | * Merged changes from 2.2.19 into 2.4.3 | |
26 | * -- Eric Biederman <ebiederman@lnxi.com>, 22 April Aug 2001 | |
27 | * | |
28 | * Multiple Nameservers in /proc/net/pnp | |
29 | * -- Josef Siemes <jsiemes@web.de>, Aug 2002 | |
30 | */ | |
31 | ||
1da177e4 LT |
32 | #include <linux/types.h> |
33 | #include <linux/string.h> | |
34 | #include <linux/kernel.h> | |
35 | #include <linux/jiffies.h> | |
36 | #include <linux/random.h> | |
37 | #include <linux/init.h> | |
38 | #include <linux/utsname.h> | |
39 | #include <linux/in.h> | |
40 | #include <linux/if.h> | |
41 | #include <linux/inet.h> | |
14c85021 | 42 | #include <linux/inetdevice.h> |
1da177e4 LT |
43 | #include <linux/netdevice.h> |
44 | #include <linux/if_arp.h> | |
45 | #include <linux/skbuff.h> | |
46 | #include <linux/ip.h> | |
47 | #include <linux/socket.h> | |
48 | #include <linux/route.h> | |
49 | #include <linux/udp.h> | |
50 | #include <linux/proc_fs.h> | |
51 | #include <linux/seq_file.h> | |
52 | #include <linux/major.h> | |
53 | #include <linux/root_dev.h> | |
54 | #include <linux/delay.h> | |
43d60661 | 55 | #include <linux/nfs_fs.h> |
5a0e3ad6 | 56 | #include <linux/slab.h> |
bc3b2d7f | 57 | #include <linux/export.h> |
457c4cbc | 58 | #include <net/net_namespace.h> |
1da177e4 LT |
59 | #include <net/arp.h> |
60 | #include <net/ip.h> | |
61 | #include <net/ipconfig.h> | |
14c85021 | 62 | #include <net/route.h> |
1da177e4 LT |
63 | |
64 | #include <asm/uaccess.h> | |
65 | #include <net/checksum.h> | |
66 | #include <asm/processor.h> | |
67 | ||
1da177e4 LT |
68 | #if defined(CONFIG_IP_PNP_DHCP) |
69 | #define IPCONFIG_DHCP | |
70 | #endif | |
71 | #if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_DHCP) | |
72 | #define IPCONFIG_BOOTP | |
73 | #endif | |
74 | #if defined(CONFIG_IP_PNP_RARP) | |
75 | #define IPCONFIG_RARP | |
76 | #endif | |
77 | #if defined(IPCONFIG_BOOTP) || defined(IPCONFIG_RARP) | |
78 | #define IPCONFIG_DYNAMIC | |
79 | #endif | |
80 | ||
81 | /* Define the friendly delay before and after opening net devices */ | |
3fb72f1e MN |
82 | #define CONF_POST_OPEN 10 /* After opening: 10 msecs */ |
83 | #define CONF_CARRIER_TIMEOUT 120000 /* Wait for carrier timeout */ | |
1da177e4 LT |
84 | |
85 | /* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */ | |
86 | #define CONF_OPEN_RETRIES 2 /* (Re)open devices twice */ | |
87 | #define CONF_SEND_RETRIES 6 /* Send six requests per open */ | |
1da177e4 LT |
88 | #define CONF_BASE_TIMEOUT (HZ*2) /* Initial timeout: 2 seconds */ |
89 | #define CONF_TIMEOUT_RANDOM (HZ) /* Maximum amount of randomization */ | |
90 | #define CONF_TIMEOUT_MULT *7/4 /* Rate of timeout growth */ | |
91 | #define CONF_TIMEOUT_MAX (HZ*30) /* Maximum allowed timeout */ | |
e905a9ed YH |
92 | #define CONF_NAMESERVERS_MAX 3 /* Maximum number of nameservers |
93 | - '3' from resolv.h */ | |
1da177e4 | 94 | |
09640e63 HH |
95 | #define NONE cpu_to_be32(INADDR_NONE) |
96 | #define ANY cpu_to_be32(INADDR_ANY) | |
1da177e4 LT |
97 | |
98 | /* | |
99 | * Public IP configuration | |
100 | */ | |
101 | ||
102 | /* This is used by platforms which might be able to set the ipconfig | |
103 | * variables using firmware environment vars. If this is set, it will | |
104 | * ignore such firmware variables. | |
105 | */ | |
106 | int ic_set_manually __initdata = 0; /* IPconfig parameters set manually */ | |
107 | ||
0d3979b9 | 108 | static int ic_enable __initdata; /* IP config enabled? */ |
1da177e4 LT |
109 | |
110 | /* Protocol choice */ | |
111 | int ic_proto_enabled __initdata = 0 | |
112 | #ifdef IPCONFIG_BOOTP | |
113 | | IC_BOOTP | |
114 | #endif | |
115 | #ifdef CONFIG_IP_PNP_DHCP | |
116 | | IC_USE_DHCP | |
117 | #endif | |
118 | #ifdef IPCONFIG_RARP | |
119 | | IC_RARP | |
120 | #endif | |
121 | ; | |
122 | ||
0d3979b9 | 123 | static int ic_host_name_set __initdata; /* Host name set by us? */ |
1da177e4 | 124 | |
5a874db4 AV |
125 | __be32 ic_myaddr = NONE; /* My IP address */ |
126 | static __be32 ic_netmask = NONE; /* Netmask for local subnet */ | |
127 | __be32 ic_gateway = NONE; /* Gateway IP address */ | |
1da177e4 | 128 | |
86ef7f9c | 129 | #ifdef IPCONFIG_DYNAMIC |
0b392be9 | 130 | static __be32 ic_addrservaddr = NONE; /* IP Address of the IP addresses'server */ |
86ef7f9c | 131 | #endif |
9dd4a13a | 132 | |
5a874db4 | 133 | __be32 ic_servaddr = NONE; /* Boot server IP address */ |
1da177e4 | 134 | |
5a874db4 | 135 | __be32 root_server_addr = NONE; /* Address of NFS server */ |
1da177e4 LT |
136 | u8 root_server_path[256] = { 0, }; /* Path to mount as root */ |
137 | ||
1b0b04f9 DM |
138 | /* vendor class identifier */ |
139 | static char vendor_class_identifier[253] __initdata; | |
62013dbb | 140 | |
26fb342c LR |
141 | #if defined(CONFIG_IP_PNP_DHCP) |
142 | static char dhcp_client_identifier[253] __initdata; | |
143 | #endif | |
144 | ||
1da177e4 LT |
145 | /* Persistent data: */ |
146 | ||
52b79e2b | 147 | #ifdef IPCONFIG_DYNAMIC |
1da177e4 | 148 | static int ic_proto_used; /* Protocol used, if any */ |
52b79e2b AB |
149 | #else |
150 | #define ic_proto_used 0 | |
151 | #endif | |
5a874db4 | 152 | static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */ |
1da177e4 LT |
153 | static u8 ic_domain[64]; /* DNS (not NIS) domain name */ |
154 | ||
155 | /* | |
156 | * Private state. | |
157 | */ | |
158 | ||
159 | /* Name of user-selected boot device */ | |
160 | static char user_dev_name[IFNAMSIZ] __initdata = { 0, }; | |
161 | ||
162 | /* Protocols supported by available interfaces */ | |
0d3979b9 | 163 | static int ic_proto_have_if __initdata; |
1da177e4 | 164 | |
9643f455 | 165 | /* MTU for boot device */ |
0d3979b9 | 166 | static int ic_dev_mtu __initdata; |
9643f455 | 167 | |
1da177e4 LT |
168 | #ifdef IPCONFIG_DYNAMIC |
169 | static DEFINE_SPINLOCK(ic_recv_lock); | |
0d3979b9 | 170 | static volatile int ic_got_reply __initdata; /* Proto(s) that replied */ |
1da177e4 LT |
171 | #endif |
172 | #ifdef IPCONFIG_DHCP | |
0d3979b9 | 173 | static int ic_dhcp_msgtype __initdata; /* DHCP msg type received */ |
1da177e4 LT |
174 | #endif |
175 | ||
176 | ||
177 | /* | |
178 | * Network devices | |
179 | */ | |
180 | ||
181 | struct ic_device { | |
182 | struct ic_device *next; | |
183 | struct net_device *dev; | |
184 | unsigned short flags; | |
185 | short able; | |
5a874db4 | 186 | __be32 xid; |
1da177e4 LT |
187 | }; |
188 | ||
0d3979b9 | 189 | static struct ic_device *ic_first_dev __initdata; /* List of open device */ |
2647cffb | 190 | static struct ic_device *ic_dev __initdata; /* Selected device */ |
1da177e4 | 191 | |
3fb72f1e | 192 | static bool __init ic_is_init_dev(struct net_device *dev) |
964ad81c | 193 | { |
3fb72f1e MN |
194 | if (dev->flags & IFF_LOOPBACK) |
195 | return false; | |
196 | return user_dev_name[0] ? !strcmp(dev->name, user_dev_name) : | |
964ad81c DM |
197 | (!(dev->flags & IFF_LOOPBACK) && |
198 | (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) && | |
3fb72f1e | 199 | strncmp(dev->name, "dummy", 5)); |
964ad81c DM |
200 | } |
201 | ||
1da177e4 LT |
202 | static int __init ic_open_devs(void) |
203 | { | |
204 | struct ic_device *d, **last; | |
205 | struct net_device *dev; | |
206 | unsigned short oflags; | |
5e404cd6 | 207 | unsigned long start, next_msg; |
1da177e4 LT |
208 | |
209 | last = &ic_first_dev; | |
6756ae4b | 210 | rtnl_lock(); |
1da177e4 | 211 | |
728c0208 | 212 | /* bring loopback and DSA master network devices up first */ |
0cc217e1 | 213 | for_each_netdev(&init_net, dev) { |
728c0208 | 214 | if (!(dev->flags & IFF_LOOPBACK) && !netdev_uses_dsa(dev)) |
0cc217e1 EB |
215 | continue; |
216 | if (dev_change_flags(dev, dev->flags | IFF_UP) < 0) | |
058bd4d2 | 217 | pr_err("IP-Config: Failed to open %s\n", dev->name); |
0cc217e1 | 218 | } |
1da177e4 | 219 | |
881d966b | 220 | for_each_netdev(&init_net, dev) { |
3fb72f1e | 221 | if (ic_is_init_dev(dev)) { |
1da177e4 LT |
222 | int able = 0; |
223 | if (dev->mtu >= 364) | |
224 | able |= IC_BOOTP; | |
225 | else | |
09605cc1 | 226 | pr_warn("DHCP/BOOTP: Ignoring device %s, MTU %d too small\n", |
058bd4d2 | 227 | dev->name, dev->mtu); |
1da177e4 LT |
228 | if (!(dev->flags & IFF_NOARP)) |
229 | able |= IC_RARP; | |
230 | able &= ic_proto_enabled; | |
231 | if (ic_proto_enabled && !able) | |
232 | continue; | |
233 | oflags = dev->flags; | |
234 | if (dev_change_flags(dev, oflags | IFF_UP) < 0) { | |
058bd4d2 JP |
235 | pr_err("IP-Config: Failed to open %s\n", |
236 | dev->name); | |
1da177e4 LT |
237 | continue; |
238 | } | |
239 | if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) { | |
6756ae4b | 240 | rtnl_unlock(); |
964ad81c | 241 | return -ENOMEM; |
1da177e4 LT |
242 | } |
243 | d->dev = dev; | |
244 | *last = d; | |
245 | last = &d->next; | |
246 | d->flags = oflags; | |
247 | d->able = able; | |
248 | if (able & IC_BOOTP) | |
5a874db4 | 249 | get_random_bytes(&d->xid, sizeof(__be32)); |
1da177e4 LT |
250 | else |
251 | d->xid = 0; | |
252 | ic_proto_have_if |= able; | |
09605cc1 BS |
253 | pr_debug("IP-Config: %s UP (able=%d, xid=%08x)\n", |
254 | dev->name, able, d->xid); | |
1da177e4 LT |
255 | } |
256 | } | |
3fb72f1e | 257 | |
cd7816d1 GF |
258 | /* no point in waiting if we could not bring up at least one device */ |
259 | if (!ic_first_dev) | |
260 | goto have_carrier; | |
261 | ||
3fb72f1e MN |
262 | /* wait for a carrier on at least one device */ |
263 | start = jiffies; | |
5e404cd6 | 264 | next_msg = start + msecs_to_jiffies(CONF_CARRIER_TIMEOUT/12); |
c72c95a0 HS |
265 | while (time_before(jiffies, start + |
266 | msecs_to_jiffies(CONF_CARRIER_TIMEOUT))) { | |
5e404cd6 PG |
267 | int wait, elapsed; |
268 | ||
3fb72f1e MN |
269 | for_each_netdev(&init_net, dev) |
270 | if (ic_is_init_dev(dev) && netif_carrier_ok(dev)) | |
271 | goto have_carrier; | |
272 | ||
273 | msleep(1); | |
5e404cd6 | 274 | |
357137a4 | 275 | if (time_before(jiffies, next_msg)) |
5e404cd6 PG |
276 | continue; |
277 | ||
278 | elapsed = jiffies_to_msecs(jiffies - start); | |
279 | wait = (CONF_CARRIER_TIMEOUT - elapsed + 500)/1000; | |
280 | pr_info("Waiting up to %d more seconds for network.\n", wait); | |
281 | next_msg = jiffies + msecs_to_jiffies(CONF_CARRIER_TIMEOUT/12); | |
3fb72f1e MN |
282 | } |
283 | have_carrier: | |
6756ae4b | 284 | rtnl_unlock(); |
1da177e4 LT |
285 | |
286 | *last = NULL; | |
287 | ||
288 | if (!ic_first_dev) { | |
289 | if (user_dev_name[0]) | |
058bd4d2 JP |
290 | pr_err("IP-Config: Device `%s' not found\n", |
291 | user_dev_name); | |
1da177e4 | 292 | else |
058bd4d2 | 293 | pr_err("IP-Config: No network devices available\n"); |
964ad81c | 294 | return -ENODEV; |
1da177e4 LT |
295 | } |
296 | return 0; | |
297 | } | |
298 | ||
299 | static void __init ic_close_devs(void) | |
300 | { | |
301 | struct ic_device *d, *next; | |
302 | struct net_device *dev; | |
303 | ||
6756ae4b | 304 | rtnl_lock(); |
1da177e4 LT |
305 | next = ic_first_dev; |
306 | while ((d = next)) { | |
307 | next = d->next; | |
308 | dev = d->dev; | |
2647cffb | 309 | if (dev != ic_dev->dev && !netdev_uses_dsa(dev)) { |
09605cc1 | 310 | pr_debug("IP-Config: Downing %s\n", dev->name); |
1da177e4 LT |
311 | dev_change_flags(dev, d->flags); |
312 | } | |
313 | kfree(d); | |
314 | } | |
6756ae4b | 315 | rtnl_unlock(); |
1da177e4 LT |
316 | } |
317 | ||
318 | /* | |
319 | * Interface to various network functions. | |
320 | */ | |
321 | ||
322 | static inline void | |
5a874db4 | 323 | set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port) |
1da177e4 LT |
324 | { |
325 | sin->sin_family = AF_INET; | |
326 | sin->sin_addr.s_addr = addr; | |
327 | sin->sin_port = port; | |
328 | } | |
329 | ||
9643f455 | 330 | static int __init ic_devinet_ioctl(unsigned int cmd, struct ifreq *arg) |
1da177e4 LT |
331 | { |
332 | int res; | |
333 | ||
334 | mm_segment_t oldfs = get_fs(); | |
335 | set_fs(get_ds()); | |
e5b13cb1 | 336 | res = devinet_ioctl(&init_net, cmd, (struct ifreq __user *) arg); |
1da177e4 LT |
337 | set_fs(oldfs); |
338 | return res; | |
339 | } | |
340 | ||
9643f455 CF |
341 | static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg) |
342 | { | |
343 | int res; | |
344 | ||
345 | mm_segment_t oldfs = get_fs(); | |
346 | set_fs(get_ds()); | |
347 | res = dev_ioctl(&init_net, cmd, (struct ifreq __user *) arg); | |
348 | set_fs(oldfs); | |
349 | return res; | |
350 | } | |
351 | ||
1da177e4 LT |
352 | static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg) |
353 | { | |
354 | int res; | |
355 | ||
356 | mm_segment_t oldfs = get_fs(); | |
357 | set_fs(get_ds()); | |
1bad118a | 358 | res = ip_rt_ioctl(&init_net, cmd, (void __user *) arg); |
1da177e4 LT |
359 | set_fs(oldfs); |
360 | return res; | |
361 | } | |
362 | ||
363 | /* | |
364 | * Set up interface addresses and routes. | |
365 | */ | |
366 | ||
367 | static int __init ic_setup_if(void) | |
368 | { | |
369 | struct ifreq ir; | |
370 | struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr; | |
371 | int err; | |
372 | ||
373 | memset(&ir, 0, sizeof(ir)); | |
2647cffb | 374 | strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->dev->name); |
1da177e4 | 375 | set_sockaddr(sin, ic_myaddr, 0); |
9643f455 | 376 | if ((err = ic_devinet_ioctl(SIOCSIFADDR, &ir)) < 0) { |
058bd4d2 JP |
377 | pr_err("IP-Config: Unable to set interface address (%d)\n", |
378 | err); | |
1da177e4 LT |
379 | return -1; |
380 | } | |
381 | set_sockaddr(sin, ic_netmask, 0); | |
9643f455 | 382 | if ((err = ic_devinet_ioctl(SIOCSIFNETMASK, &ir)) < 0) { |
058bd4d2 JP |
383 | pr_err("IP-Config: Unable to set interface netmask (%d)\n", |
384 | err); | |
1da177e4 LT |
385 | return -1; |
386 | } | |
387 | set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0); | |
9643f455 | 388 | if ((err = ic_devinet_ioctl(SIOCSIFBRDADDR, &ir)) < 0) { |
058bd4d2 JP |
389 | pr_err("IP-Config: Unable to set interface broadcast address (%d)\n", |
390 | err); | |
1da177e4 LT |
391 | return -1; |
392 | } | |
9643f455 CF |
393 | /* Handle the case where we need non-standard MTU on the boot link (a network |
394 | * using jumbo frames, for instance). If we can't set the mtu, don't error | |
395 | * out, we'll try to muddle along. | |
396 | */ | |
397 | if (ic_dev_mtu != 0) { | |
2647cffb | 398 | strcpy(ir.ifr_name, ic_dev->dev->name); |
9643f455 CF |
399 | ir.ifr_mtu = ic_dev_mtu; |
400 | if ((err = ic_dev_ioctl(SIOCSIFMTU, &ir)) < 0) | |
058bd4d2 JP |
401 | pr_err("IP-Config: Unable to set interface mtu to %d (%d)\n", |
402 | ic_dev_mtu, err); | |
9643f455 | 403 | } |
1da177e4 LT |
404 | return 0; |
405 | } | |
406 | ||
407 | static int __init ic_setup_routes(void) | |
408 | { | |
409 | /* No need to setup device routes, only the default route... */ | |
410 | ||
5a874db4 | 411 | if (ic_gateway != NONE) { |
1da177e4 LT |
412 | struct rtentry rm; |
413 | int err; | |
414 | ||
415 | memset(&rm, 0, sizeof(rm)); | |
416 | if ((ic_gateway ^ ic_myaddr) & ic_netmask) { | |
058bd4d2 | 417 | pr_err("IP-Config: Gateway not on directly connected network\n"); |
1da177e4 LT |
418 | return -1; |
419 | } | |
420 | set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0); | |
421 | set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0); | |
422 | set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0); | |
423 | rm.rt_flags = RTF_UP | RTF_GATEWAY; | |
424 | if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) { | |
058bd4d2 JP |
425 | pr_err("IP-Config: Cannot add default route (%d)\n", |
426 | err); | |
1da177e4 LT |
427 | return -1; |
428 | } | |
429 | } | |
430 | ||
431 | return 0; | |
432 | } | |
433 | ||
434 | /* | |
435 | * Fill in default values for all missing parameters. | |
436 | */ | |
437 | ||
438 | static int __init ic_defaults(void) | |
439 | { | |
440 | /* | |
441 | * At this point we have no userspace running so need not | |
442 | * claim locks on system_utsname | |
443 | */ | |
e905a9ed | 444 | |
1da177e4 | 445 | if (!ic_host_name_set) |
673d57e7 | 446 | sprintf(init_utsname()->nodename, "%pI4", &ic_myaddr); |
1da177e4 | 447 | |
5a874db4 | 448 | if (root_server_addr == NONE) |
1da177e4 LT |
449 | root_server_addr = ic_servaddr; |
450 | ||
5a874db4 | 451 | if (ic_netmask == NONE) { |
1da177e4 LT |
452 | if (IN_CLASSA(ntohl(ic_myaddr))) |
453 | ic_netmask = htonl(IN_CLASSA_NET); | |
454 | else if (IN_CLASSB(ntohl(ic_myaddr))) | |
455 | ic_netmask = htonl(IN_CLASSB_NET); | |
456 | else if (IN_CLASSC(ntohl(ic_myaddr))) | |
457 | ic_netmask = htonl(IN_CLASSC_NET); | |
458 | else { | |
058bd4d2 JP |
459 | pr_err("IP-Config: Unable to guess netmask for address %pI4\n", |
460 | &ic_myaddr); | |
1da177e4 LT |
461 | return -1; |
462 | } | |
09605cc1 BS |
463 | pr_notice("IP-Config: Guessing netmask %pI4\n", |
464 | &ic_netmask); | |
1da177e4 LT |
465 | } |
466 | ||
467 | return 0; | |
468 | } | |
469 | ||
470 | /* | |
471 | * RARP support. | |
472 | */ | |
473 | ||
474 | #ifdef IPCONFIG_RARP | |
475 | ||
f2ccd8fa | 476 | static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); |
1da177e4 LT |
477 | |
478 | static struct packet_type rarp_packet_type __initdata = { | |
09640e63 | 479 | .type = cpu_to_be16(ETH_P_RARP), |
1da177e4 LT |
480 | .func = ic_rarp_recv, |
481 | }; | |
482 | ||
45e741b8 | 483 | static inline void __init ic_rarp_init(void) |
1da177e4 LT |
484 | { |
485 | dev_add_pack(&rarp_packet_type); | |
486 | } | |
487 | ||
45e741b8 | 488 | static inline void __init ic_rarp_cleanup(void) |
1da177e4 LT |
489 | { |
490 | dev_remove_pack(&rarp_packet_type); | |
491 | } | |
492 | ||
493 | /* | |
494 | * Process received RARP packet. | |
495 | */ | |
496 | static int __init | |
f2ccd8fa | 497 | ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) |
1da177e4 LT |
498 | { |
499 | struct arphdr *rarp; | |
500 | unsigned char *rarp_ptr; | |
5a874db4 | 501 | __be32 sip, tip; |
6b436d33 | 502 | unsigned char *tha; /* t for "target" */ |
1da177e4 LT |
503 | struct ic_device *d; |
504 | ||
721499e8 | 505 | if (!net_eq(dev_net(dev), &init_net)) |
e730c155 EB |
506 | goto drop; |
507 | ||
51456b29 IM |
508 | skb = skb_share_check(skb, GFP_ATOMIC); |
509 | if (!skb) | |
1da177e4 LT |
510 | return NET_RX_DROP; |
511 | ||
512 | if (!pskb_may_pull(skb, sizeof(struct arphdr))) | |
513 | goto drop; | |
514 | ||
515 | /* Basic sanity checks can be done without the lock. */ | |
9c70220b | 516 | rarp = (struct arphdr *)skb_transport_header(skb); |
1da177e4 LT |
517 | |
518 | /* If this test doesn't pass, it's not IP, or we should | |
519 | * ignore it anyway. | |
520 | */ | |
521 | if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd)) | |
522 | goto drop; | |
523 | ||
524 | /* If it's not a RARP reply, delete it. */ | |
525 | if (rarp->ar_op != htons(ARPOP_RREPLY)) | |
526 | goto drop; | |
527 | ||
528 | /* If it's not Ethernet, delete it. */ | |
529 | if (rarp->ar_pro != htons(ETH_P_IP)) | |
530 | goto drop; | |
531 | ||
988b7050 | 532 | if (!pskb_may_pull(skb, arp_hdr_len(dev))) |
1da177e4 LT |
533 | goto drop; |
534 | ||
535 | /* OK, it is all there and looks valid, process... */ | |
9c70220b | 536 | rarp = (struct arphdr *)skb_transport_header(skb); |
1da177e4 LT |
537 | rarp_ptr = (unsigned char *) (rarp + 1); |
538 | ||
539 | /* One reply at a time, please. */ | |
540 | spin_lock(&ic_recv_lock); | |
541 | ||
542 | /* If we already have a reply, just drop the packet */ | |
543 | if (ic_got_reply) | |
544 | goto drop_unlock; | |
545 | ||
546 | /* Find the ic_device that the packet arrived on */ | |
547 | d = ic_first_dev; | |
548 | while (d && d->dev != dev) | |
549 | d = d->next; | |
550 | if (!d) | |
551 | goto drop_unlock; /* should never happen */ | |
552 | ||
553 | /* Extract variable-width fields */ | |
1da177e4 LT |
554 | rarp_ptr += dev->addr_len; |
555 | memcpy(&sip, rarp_ptr, 4); | |
556 | rarp_ptr += 4; | |
557 | tha = rarp_ptr; | |
558 | rarp_ptr += dev->addr_len; | |
559 | memcpy(&tip, rarp_ptr, 4); | |
560 | ||
561 | /* Discard packets which are not meant for us. */ | |
562 | if (memcmp(tha, dev->dev_addr, dev->addr_len)) | |
563 | goto drop_unlock; | |
564 | ||
565 | /* Discard packets which are not from specified server. */ | |
5a874db4 | 566 | if (ic_servaddr != NONE && ic_servaddr != sip) |
1da177e4 LT |
567 | goto drop_unlock; |
568 | ||
569 | /* We have a winner! */ | |
2647cffb | 570 | ic_dev = d; |
5a874db4 | 571 | if (ic_myaddr == NONE) |
1da177e4 LT |
572 | ic_myaddr = tip; |
573 | ic_servaddr = sip; | |
9dd4a13a | 574 | ic_addrservaddr = sip; |
1da177e4 LT |
575 | ic_got_reply = IC_RARP; |
576 | ||
577 | drop_unlock: | |
578 | /* Show's over. Nothing to see here. */ | |
579 | spin_unlock(&ic_recv_lock); | |
580 | ||
581 | drop: | |
582 | /* Throw the packet out. */ | |
583 | kfree_skb(skb); | |
584 | return 0; | |
585 | } | |
586 | ||
587 | ||
588 | /* | |
589 | * Send RARP request packet over a single interface. | |
590 | */ | |
591 | static void __init ic_rarp_send_if(struct ic_device *d) | |
592 | { | |
593 | struct net_device *dev = d->dev; | |
594 | arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL, | |
595 | dev->dev_addr, dev->dev_addr); | |
596 | } | |
597 | #endif | |
598 | ||
842b08bb AS |
599 | /* |
600 | * Predefine Nameservers | |
601 | */ | |
602 | static inline void __init ic_nameservers_predef(void) | |
603 | { | |
604 | int i; | |
605 | ||
606 | for (i = 0; i < CONF_NAMESERVERS_MAX; i++) | |
607 | ic_nameservers[i] = NONE; | |
608 | } | |
609 | ||
1da177e4 LT |
610 | /* |
611 | * DHCP/BOOTP support. | |
612 | */ | |
613 | ||
614 | #ifdef IPCONFIG_BOOTP | |
615 | ||
616 | struct bootp_pkt { /* BOOTP packet format */ | |
617 | struct iphdr iph; /* IP header */ | |
618 | struct udphdr udph; /* UDP header */ | |
619 | u8 op; /* 1=request, 2=reply */ | |
620 | u8 htype; /* HW address type */ | |
621 | u8 hlen; /* HW address length */ | |
622 | u8 hops; /* Used only by gateways */ | |
5a874db4 AV |
623 | __be32 xid; /* Transaction ID */ |
624 | __be16 secs; /* Seconds since we started */ | |
625 | __be16 flags; /* Just what it says */ | |
626 | __be32 client_ip; /* Client's IP address if known */ | |
627 | __be32 your_ip; /* Assigned IP address */ | |
628 | __be32 server_ip; /* (Next, e.g. NFS) Server's IP address */ | |
629 | __be32 relay_ip; /* IP address of BOOTP relay */ | |
1da177e4 LT |
630 | u8 hw_addr[16]; /* Client's HW address */ |
631 | u8 serv_name[64]; /* Server host name */ | |
632 | u8 boot_file[128]; /* Name of boot file */ | |
633 | u8 exten[312]; /* DHCP options / BOOTP vendor extensions */ | |
634 | }; | |
635 | ||
636 | /* packet ops */ | |
637 | #define BOOTP_REQUEST 1 | |
638 | #define BOOTP_REPLY 2 | |
639 | ||
640 | /* DHCP message types */ | |
641 | #define DHCPDISCOVER 1 | |
642 | #define DHCPOFFER 2 | |
643 | #define DHCPREQUEST 3 | |
644 | #define DHCPDECLINE 4 | |
645 | #define DHCPACK 5 | |
646 | #define DHCPNAK 6 | |
647 | #define DHCPRELEASE 7 | |
648 | #define DHCPINFORM 8 | |
649 | ||
f2ccd8fa | 650 | static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); |
1da177e4 LT |
651 | |
652 | static struct packet_type bootp_packet_type __initdata = { | |
09640e63 | 653 | .type = cpu_to_be16(ETH_P_IP), |
1da177e4 LT |
654 | .func = ic_bootp_recv, |
655 | }; | |
656 | ||
1da177e4 LT |
657 | /* |
658 | * Initialize DHCP/BOOTP extension fields in the request. | |
659 | */ | |
660 | ||
661 | static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 }; | |
662 | ||
663 | #ifdef IPCONFIG_DHCP | |
664 | ||
665 | static void __init | |
22fc5388 | 666 | ic_dhcp_init_options(u8 *options, struct ic_device *d) |
1da177e4 | 667 | { |
5a874db4 | 668 | u8 mt = ((ic_servaddr == NONE) |
1da177e4 LT |
669 | ? DHCPDISCOVER : DHCPREQUEST); |
670 | u8 *e = options; | |
62013dbb | 671 | int len; |
1da177e4 | 672 | |
22fc5388 | 673 | pr_debug("DHCP: Sending message type %d (%s)\n", mt, d->dev->name); |
1da177e4 LT |
674 | |
675 | memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ | |
676 | e += 4; | |
677 | ||
678 | *e++ = 53; /* DHCP message type */ | |
679 | *e++ = 1; | |
680 | *e++ = mt; | |
681 | ||
682 | if (mt == DHCPREQUEST) { | |
683 | *e++ = 54; /* Server ID (IP address) */ | |
684 | *e++ = 4; | |
685 | memcpy(e, &ic_servaddr, 4); | |
686 | e += 4; | |
687 | ||
688 | *e++ = 50; /* Requested IP address */ | |
689 | *e++ = 4; | |
690 | memcpy(e, &ic_myaddr, 4); | |
691 | e += 4; | |
692 | } | |
693 | ||
694 | /* always? */ | |
695 | { | |
696 | static const u8 ic_req_params[] = { | |
697 | 1, /* Subnet mask */ | |
698 | 3, /* Default gateway */ | |
699 | 6, /* DNS server */ | |
700 | 12, /* Host name */ | |
701 | 15, /* Domain name */ | |
702 | 17, /* Boot path */ | |
9643f455 | 703 | 26, /* MTU */ |
1da177e4 LT |
704 | 40, /* NIS domain name */ |
705 | }; | |
706 | ||
707 | *e++ = 55; /* Parameter request list */ | |
708 | *e++ = sizeof(ic_req_params); | |
709 | memcpy(e, ic_req_params, sizeof(ic_req_params)); | |
710 | e += sizeof(ic_req_params); | |
62013dbb | 711 | |
130c0f47 WF |
712 | if (ic_host_name_set) { |
713 | *e++ = 12; /* host-name */ | |
714 | len = strlen(utsname()->nodename); | |
715 | *e++ = len; | |
716 | memcpy(e, utsname()->nodename, len); | |
717 | e += len; | |
718 | } | |
62013dbb | 719 | if (*vendor_class_identifier) { |
058bd4d2 JP |
720 | pr_info("DHCP: sending class identifier \"%s\"\n", |
721 | vendor_class_identifier); | |
62013dbb RJ |
722 | *e++ = 60; /* Class-identifier */ |
723 | len = strlen(vendor_class_identifier); | |
724 | *e++ = len; | |
725 | memcpy(e, vendor_class_identifier, len); | |
726 | e += len; | |
727 | } | |
26fb342c LR |
728 | len = strlen(dhcp_client_identifier + 1); |
729 | /* the minimum length of identifier is 2, include 1 byte type, | |
730 | * and can not be larger than the length of options | |
731 | */ | |
732 | if (len >= 1 && len < 312 - (e - options) - 1) { | |
733 | *e++ = 61; | |
734 | *e++ = len + 1; | |
735 | memcpy(e, dhcp_client_identifier, len + 1); | |
736 | e += len + 1; | |
737 | } | |
1da177e4 LT |
738 | } |
739 | ||
740 | *e++ = 255; /* End of the list */ | |
741 | } | |
742 | ||
743 | #endif /* IPCONFIG_DHCP */ | |
744 | ||
745 | static void __init ic_bootp_init_ext(u8 *e) | |
746 | { | |
747 | memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ | |
748 | e += 4; | |
749 | *e++ = 1; /* Subnet mask request */ | |
750 | *e++ = 4; | |
751 | e += 4; | |
752 | *e++ = 3; /* Default gateway request */ | |
753 | *e++ = 4; | |
754 | e += 4; | |
755 | *e++ = 5; /* Name server request */ | |
756 | *e++ = 8; | |
757 | e += 8; | |
758 | *e++ = 12; /* Host name request */ | |
759 | *e++ = 32; | |
760 | e += 32; | |
761 | *e++ = 40; /* NIS Domain name request */ | |
762 | *e++ = 32; | |
763 | e += 32; | |
764 | *e++ = 17; /* Boot path */ | |
765 | *e++ = 40; | |
766 | e += 40; | |
767 | ||
e905a9ed | 768 | *e++ = 57; /* set extension buffer size for reply */ |
1da177e4 | 769 | *e++ = 2; |
e905a9ed | 770 | *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */ |
1da177e4 LT |
771 | *e++ = 150; |
772 | ||
773 | *e++ = 255; /* End of the list */ | |
774 | } | |
775 | ||
776 | ||
5e953778 CF |
777 | /* |
778 | * Initialize the DHCP/BOOTP mechanism. | |
779 | */ | |
780 | static inline void __init ic_bootp_init(void) | |
781 | { | |
782 | ic_nameservers_predef(); | |
1da177e4 LT |
783 | |
784 | dev_add_pack(&bootp_packet_type); | |
785 | } | |
786 | ||
787 | ||
788 | /* | |
789 | * DHCP/BOOTP cleanup. | |
790 | */ | |
45e741b8 | 791 | static inline void __init ic_bootp_cleanup(void) |
1da177e4 LT |
792 | { |
793 | dev_remove_pack(&bootp_packet_type); | |
794 | } | |
795 | ||
796 | ||
797 | /* | |
798 | * Send DHCP/BOOTP request to single interface. | |
799 | */ | |
800 | static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff) | |
801 | { | |
802 | struct net_device *dev = d->dev; | |
803 | struct sk_buff *skb; | |
804 | struct bootp_pkt *b; | |
1da177e4 | 805 | struct iphdr *h; |
66088243 HX |
806 | int hlen = LL_RESERVED_SPACE(dev); |
807 | int tlen = dev->needed_tailroom; | |
1da177e4 LT |
808 | |
809 | /* Allocate packet */ | |
66088243 | 810 | skb = alloc_skb(sizeof(struct bootp_pkt) + hlen + tlen + 15, |
f5184d26 | 811 | GFP_KERNEL); |
1da177e4 LT |
812 | if (!skb) |
813 | return; | |
66088243 | 814 | skb_reserve(skb, hlen); |
1da177e4 LT |
815 | b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt)); |
816 | memset(b, 0, sizeof(struct bootp_pkt)); | |
817 | ||
818 | /* Construct IP header */ | |
04b964db | 819 | skb_reset_network_header(skb); |
eddc9ec5 | 820 | h = ip_hdr(skb); |
1da177e4 LT |
821 | h->version = 4; |
822 | h->ihl = 5; | |
823 | h->tot_len = htons(sizeof(struct bootp_pkt)); | |
824 | h->frag_off = htons(IP_DF); | |
825 | h->ttl = 64; | |
826 | h->protocol = IPPROTO_UDP; | |
5a874db4 | 827 | h->daddr = htonl(INADDR_BROADCAST); |
1da177e4 LT |
828 | h->check = ip_fast_csum((unsigned char *) h, h->ihl); |
829 | ||
830 | /* Construct UDP header */ | |
831 | b->udph.source = htons(68); | |
832 | b->udph.dest = htons(67); | |
833 | b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr)); | |
834 | /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */ | |
835 | ||
836 | /* Construct DHCP/BOOTP header */ | |
837 | b->op = BOOTP_REQUEST; | |
838 | if (dev->type < 256) /* check for false types */ | |
839 | b->htype = dev->type; | |
1da177e4 LT |
840 | else if (dev->type == ARPHRD_FDDI) |
841 | b->htype = ARPHRD_ETHER; | |
842 | else { | |
09605cc1 BS |
843 | pr_warn("Unknown ARP type 0x%04x for device %s\n", dev->type, |
844 | dev->name); | |
1da177e4 LT |
845 | b->htype = dev->type; /* can cause undefined behavior */ |
846 | } | |
dea75bdf SH |
847 | |
848 | /* server_ip and your_ip address are both already zero per RFC2131 */ | |
1da177e4 | 849 | b->hlen = dev->addr_len; |
1da177e4 LT |
850 | memcpy(b->hw_addr, dev->dev_addr, dev->addr_len); |
851 | b->secs = htons(jiffies_diff / HZ); | |
852 | b->xid = d->xid; | |
853 | ||
854 | /* add DHCP options or BOOTP extensions */ | |
855 | #ifdef IPCONFIG_DHCP | |
856 | if (ic_proto_enabled & IC_USE_DHCP) | |
22fc5388 | 857 | ic_dhcp_init_options(b->exten, d); |
1da177e4 LT |
858 | else |
859 | #endif | |
860 | ic_bootp_init_ext(b->exten); | |
861 | ||
862 | /* Chain packet down the line... */ | |
863 | skb->dev = dev; | |
864 | skb->protocol = htons(ETH_P_IP); | |
0c4e8581 | 865 | if (dev_hard_header(skb, dev, ntohs(skb->protocol), |
ad79eefc RL |
866 | dev->broadcast, dev->dev_addr, skb->len) < 0) { |
867 | kfree_skb(skb); | |
868 | printk("E"); | |
869 | return; | |
870 | } | |
871 | ||
872 | if (dev_queue_xmit(skb) < 0) | |
1da177e4 LT |
873 | printk("E"); |
874 | } | |
875 | ||
876 | ||
877 | /* | |
878 | * Copy BOOTP-supplied string if not already set. | |
879 | */ | |
880 | static int __init ic_bootp_string(char *dest, char *src, int len, int max) | |
881 | { | |
882 | if (!len) | |
883 | return 0; | |
884 | if (len > max-1) | |
885 | len = max-1; | |
886 | memcpy(dest, src, len); | |
887 | dest[len] = '\0'; | |
888 | return 1; | |
889 | } | |
890 | ||
891 | ||
892 | /* | |
893 | * Process BOOTP extensions. | |
894 | */ | |
895 | static void __init ic_do_bootp_ext(u8 *ext) | |
896 | { | |
747465ef ED |
897 | u8 servers; |
898 | int i; | |
899 | __be16 mtu; | |
1da177e4 | 900 | |
1da177e4 LT |
901 | u8 *c; |
902 | ||
09605cc1 | 903 | pr_debug("DHCP/BOOTP: Got extension %d:", *ext); |
132adf54 | 904 | for (c=ext+2; c<ext+2+ext[1]; c++) |
09605cc1 BS |
905 | pr_debug(" %02x", *c); |
906 | pr_debug("\n"); | |
1da177e4 LT |
907 | |
908 | switch (*ext++) { | |
1d67a516 JP |
909 | case 1: /* Subnet mask */ |
910 | if (ic_netmask == NONE) | |
911 | memcpy(&ic_netmask, ext+1, 4); | |
912 | break; | |
913 | case 3: /* Default gateway */ | |
914 | if (ic_gateway == NONE) | |
915 | memcpy(&ic_gateway, ext+1, 4); | |
916 | break; | |
917 | case 6: /* DNS server */ | |
918 | servers= *ext/4; | |
919 | if (servers > CONF_NAMESERVERS_MAX) | |
920 | servers = CONF_NAMESERVERS_MAX; | |
921 | for (i = 0; i < servers; i++) { | |
922 | if (ic_nameservers[i] == NONE) | |
923 | memcpy(&ic_nameservers[i], ext+1+4*i, 4); | |
924 | } | |
925 | break; | |
926 | case 12: /* Host name */ | |
927 | ic_bootp_string(utsname()->nodename, ext+1, *ext, | |
928 | __NEW_UTS_LEN); | |
929 | ic_host_name_set = 1; | |
930 | break; | |
931 | case 15: /* Domain name (DNS) */ | |
932 | ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain)); | |
933 | break; | |
934 | case 17: /* Root path */ | |
935 | if (!root_server_path[0]) | |
936 | ic_bootp_string(root_server_path, ext+1, *ext, | |
937 | sizeof(root_server_path)); | |
938 | break; | |
939 | case 26: /* Interface MTU */ | |
940 | memcpy(&mtu, ext+1, sizeof(mtu)); | |
941 | ic_dev_mtu = ntohs(mtu); | |
942 | break; | |
943 | case 40: /* NIS Domain name (_not_ DNS) */ | |
944 | ic_bootp_string(utsname()->domainname, ext+1, *ext, | |
945 | __NEW_UTS_LEN); | |
946 | break; | |
1da177e4 LT |
947 | } |
948 | } | |
949 | ||
950 | ||
951 | /* | |
952 | * Receive BOOTP reply. | |
953 | */ | |
f2ccd8fa | 954 | static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) |
1da177e4 LT |
955 | { |
956 | struct bootp_pkt *b; | |
957 | struct iphdr *h; | |
958 | struct ic_device *d; | |
959 | int len, ext_len; | |
960 | ||
721499e8 | 961 | if (!net_eq(dev_net(dev), &init_net)) |
e730c155 EB |
962 | goto drop; |
963 | ||
1da177e4 LT |
964 | /* Perform verifications before taking the lock. */ |
965 | if (skb->pkt_type == PACKET_OTHERHOST) | |
966 | goto drop; | |
967 | ||
51456b29 IM |
968 | skb = skb_share_check(skb, GFP_ATOMIC); |
969 | if (!skb) | |
1da177e4 LT |
970 | return NET_RX_DROP; |
971 | ||
972 | if (!pskb_may_pull(skb, | |
973 | sizeof(struct iphdr) + | |
974 | sizeof(struct udphdr))) | |
975 | goto drop; | |
976 | ||
eddc9ec5 | 977 | b = (struct bootp_pkt *)skb_network_header(skb); |
1da177e4 LT |
978 | h = &b->iph; |
979 | ||
980 | if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP) | |
981 | goto drop; | |
982 | ||
983 | /* Fragments are not supported */ | |
56f8a75c | 984 | if (ip_is_fragment(h)) { |
e87cc472 | 985 | net_err_ratelimited("DHCP/BOOTP: Ignoring fragmented reply\n"); |
1da177e4 LT |
986 | goto drop; |
987 | } | |
988 | ||
989 | if (skb->len < ntohs(h->tot_len)) | |
990 | goto drop; | |
991 | ||
992 | if (ip_fast_csum((char *) h, h->ihl)) | |
993 | goto drop; | |
994 | ||
995 | if (b->udph.source != htons(67) || b->udph.dest != htons(68)) | |
996 | goto drop; | |
997 | ||
998 | if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr)) | |
999 | goto drop; | |
1000 | ||
1001 | len = ntohs(b->udph.len) - sizeof(struct udphdr); | |
1002 | ext_len = len - (sizeof(*b) - | |
1003 | sizeof(struct iphdr) - | |
1004 | sizeof(struct udphdr) - | |
1005 | sizeof(b->exten)); | |
1006 | if (ext_len < 0) | |
1007 | goto drop; | |
1008 | ||
1009 | /* Ok the front looks good, make sure we can get at the rest. */ | |
1010 | if (!pskb_may_pull(skb, skb->len)) | |
1011 | goto drop; | |
1012 | ||
eddc9ec5 | 1013 | b = (struct bootp_pkt *)skb_network_header(skb); |
1da177e4 LT |
1014 | h = &b->iph; |
1015 | ||
1016 | /* One reply at a time, please. */ | |
1017 | spin_lock(&ic_recv_lock); | |
1018 | ||
1019 | /* If we already have a reply, just drop the packet */ | |
1020 | if (ic_got_reply) | |
1021 | goto drop_unlock; | |
1022 | ||
1023 | /* Find the ic_device that the packet arrived on */ | |
1024 | d = ic_first_dev; | |
1025 | while (d && d->dev != dev) | |
1026 | d = d->next; | |
1027 | if (!d) | |
1028 | goto drop_unlock; /* should never happen */ | |
1029 | ||
1030 | /* Is it a reply to our BOOTP request? */ | |
1031 | if (b->op != BOOTP_REPLY || | |
1032 | b->xid != d->xid) { | |
22fc5388 UKK |
1033 | net_err_ratelimited("DHCP/BOOTP: Reply not for us on %s, op[%x] xid[%x]\n", |
1034 | d->dev->name, b->op, b->xid); | |
1da177e4 LT |
1035 | goto drop_unlock; |
1036 | } | |
1037 | ||
1038 | /* Parse extensions */ | |
1039 | if (ext_len >= 4 && | |
1040 | !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */ | |
e905a9ed | 1041 | u8 *end = (u8 *) b + ntohs(b->iph.tot_len); |
1da177e4 LT |
1042 | u8 *ext; |
1043 | ||
1044 | #ifdef IPCONFIG_DHCP | |
1045 | if (ic_proto_enabled & IC_USE_DHCP) { | |
5a874db4 | 1046 | __be32 server_id = NONE; |
1da177e4 LT |
1047 | int mt = 0; |
1048 | ||
1049 | ext = &b->exten[4]; | |
1050 | while (ext < end && *ext != 0xff) { | |
1051 | u8 *opt = ext++; | |
1052 | if (*opt == 0) /* Padding */ | |
1053 | continue; | |
1054 | ext += *ext + 1; | |
1055 | if (ext >= end) | |
1056 | break; | |
1057 | switch (*opt) { | |
1058 | case 53: /* Message type */ | |
1059 | if (opt[1]) | |
1060 | mt = opt[2]; | |
1061 | break; | |
1062 | case 54: /* Server ID (IP address) */ | |
1063 | if (opt[1] >= 4) | |
1064 | memcpy(&server_id, opt + 2, 4); | |
1065 | break; | |
3ff50b79 | 1066 | } |
1da177e4 LT |
1067 | } |
1068 | ||
22fc5388 | 1069 | pr_debug("DHCP: Got message type %d (%s)\n", mt, d->dev->name); |
1da177e4 LT |
1070 | |
1071 | switch (mt) { | |
1072 | case DHCPOFFER: | |
1073 | /* While in the process of accepting one offer, | |
1074 | * ignore all others. | |
1075 | */ | |
5a874db4 | 1076 | if (ic_myaddr != NONE) |
1da177e4 LT |
1077 | goto drop_unlock; |
1078 | ||
1079 | /* Let's accept that offer. */ | |
1080 | ic_myaddr = b->your_ip; | |
1081 | ic_servaddr = server_id; | |
09605cc1 BS |
1082 | pr_debug("DHCP: Offered address %pI4 by server %pI4\n", |
1083 | &ic_myaddr, &b->iph.saddr); | |
1da177e4 LT |
1084 | /* The DHCP indicated server address takes |
1085 | * precedence over the bootp header one if | |
1086 | * they are different. | |
1087 | */ | |
5a874db4 | 1088 | if ((server_id != NONE) && |
1da177e4 LT |
1089 | (b->server_ip != server_id)) |
1090 | b->server_ip = ic_servaddr; | |
1091 | break; | |
1092 | ||
1093 | case DHCPACK: | |
1094 | if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0) | |
1095 | goto drop_unlock; | |
1096 | ||
1097 | /* Yeah! */ | |
1098 | break; | |
1099 | ||
1100 | default: | |
1101 | /* Urque. Forget it*/ | |
5a874db4 AV |
1102 | ic_myaddr = NONE; |
1103 | ic_servaddr = NONE; | |
1da177e4 | 1104 | goto drop_unlock; |
3ff50b79 | 1105 | } |
1da177e4 LT |
1106 | |
1107 | ic_dhcp_msgtype = mt; | |
1108 | ||
1109 | } | |
1110 | #endif /* IPCONFIG_DHCP */ | |
1111 | ||
1112 | ext = &b->exten[4]; | |
1113 | while (ext < end && *ext != 0xff) { | |
1114 | u8 *opt = ext++; | |
1115 | if (*opt == 0) /* Padding */ | |
1116 | continue; | |
1117 | ext += *ext + 1; | |
1118 | if (ext < end) | |
1119 | ic_do_bootp_ext(opt); | |
1120 | } | |
1121 | } | |
1122 | ||
1123 | /* We have a winner! */ | |
2647cffb | 1124 | ic_dev = d; |
1da177e4 LT |
1125 | ic_myaddr = b->your_ip; |
1126 | ic_servaddr = b->server_ip; | |
9dd4a13a | 1127 | ic_addrservaddr = b->iph.saddr; |
5a874db4 | 1128 | if (ic_gateway == NONE && b->relay_ip) |
1da177e4 | 1129 | ic_gateway = b->relay_ip; |
5a874db4 | 1130 | if (ic_nameservers[0] == NONE) |
1da177e4 LT |
1131 | ic_nameservers[0] = ic_servaddr; |
1132 | ic_got_reply = IC_BOOTP; | |
1133 | ||
1134 | drop_unlock: | |
1135 | /* Show's over. Nothing to see here. */ | |
1136 | spin_unlock(&ic_recv_lock); | |
1137 | ||
1138 | drop: | |
1139 | /* Throw the packet out. */ | |
1140 | kfree_skb(skb); | |
1141 | ||
1142 | return 0; | |
e905a9ed | 1143 | } |
1da177e4 LT |
1144 | |
1145 | ||
1146 | #endif | |
1147 | ||
1148 | ||
1149 | /* | |
1150 | * Dynamic IP configuration -- DHCP, BOOTP, RARP. | |
1151 | */ | |
1152 | ||
1153 | #ifdef IPCONFIG_DYNAMIC | |
1154 | ||
1155 | static int __init ic_dynamic(void) | |
1156 | { | |
1157 | int retries; | |
1158 | struct ic_device *d; | |
1159 | unsigned long start_jiffies, timeout, jiff; | |
1160 | int do_bootp = ic_proto_have_if & IC_BOOTP; | |
1161 | int do_rarp = ic_proto_have_if & IC_RARP; | |
1162 | ||
1163 | /* | |
1164 | * If none of DHCP/BOOTP/RARP was selected, return with an error. | |
1165 | * This routine gets only called when some pieces of information | |
1166 | * are missing, and without DHCP/BOOTP/RARP we are unable to get it. | |
1167 | */ | |
1168 | if (!ic_proto_enabled) { | |
058bd4d2 | 1169 | pr_err("IP-Config: Incomplete network configuration information\n"); |
1da177e4 LT |
1170 | return -1; |
1171 | } | |
1172 | ||
1173 | #ifdef IPCONFIG_BOOTP | |
1174 | if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP) | |
058bd4d2 | 1175 | pr_err("DHCP/BOOTP: No suitable device found\n"); |
1da177e4 LT |
1176 | #endif |
1177 | #ifdef IPCONFIG_RARP | |
1178 | if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP) | |
058bd4d2 | 1179 | pr_err("RARP: No suitable device found\n"); |
1da177e4 LT |
1180 | #endif |
1181 | ||
1182 | if (!ic_proto_have_if) | |
1183 | /* Error message already printed */ | |
1184 | return -1; | |
1185 | ||
1186 | /* | |
1187 | * Setup protocols | |
1188 | */ | |
1189 | #ifdef IPCONFIG_BOOTP | |
1190 | if (do_bootp) | |
1191 | ic_bootp_init(); | |
1192 | #endif | |
1193 | #ifdef IPCONFIG_RARP | |
1194 | if (do_rarp) | |
1195 | ic_rarp_init(); | |
1196 | #endif | |
1197 | ||
1198 | /* | |
1199 | * Send requests and wait, until we get an answer. This loop | |
1200 | * seems to be a terrible waste of CPU time, but actually there is | |
1201 | * only one process running at all, so we don't need to use any | |
1202 | * scheduler functions. | |
e905a9ed | 1203 | * [Actually we could now, but the nothing else running note still |
1da177e4 LT |
1204 | * applies.. - AC] |
1205 | */ | |
058bd4d2 JP |
1206 | pr_notice("Sending %s%s%s requests .", |
1207 | do_bootp | |
1208 | ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "", | |
1209 | (do_bootp && do_rarp) ? " and " : "", | |
1210 | do_rarp ? "RARP" : ""); | |
1da177e4 LT |
1211 | |
1212 | start_jiffies = jiffies; | |
1213 | d = ic_first_dev; | |
1214 | retries = CONF_SEND_RETRIES; | |
1215 | get_random_bytes(&timeout, sizeof(timeout)); | |
95c96174 | 1216 | timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned int) CONF_TIMEOUT_RANDOM); |
132adf54 | 1217 | for (;;) { |
405fd707 | 1218 | #ifdef IPCONFIG_BOOTP |
1da177e4 LT |
1219 | if (do_bootp && (d->able & IC_BOOTP)) |
1220 | ic_bootp_send_if(d, jiffies - start_jiffies); | |
1221 | #endif | |
1222 | #ifdef IPCONFIG_RARP | |
1223 | if (do_rarp && (d->able & IC_RARP)) | |
1224 | ic_rarp_send_if(d); | |
1225 | #endif | |
1226 | ||
e0688534 UKK |
1227 | if (!d->next) { |
1228 | jiff = jiffies + timeout; | |
1229 | while (time_before(jiffies, jiff) && !ic_got_reply) | |
1230 | schedule_timeout_uninterruptible(1); | |
1231 | } | |
1da177e4 LT |
1232 | #ifdef IPCONFIG_DHCP |
1233 | /* DHCP isn't done until we get a DHCPACK. */ | |
9d4fb27d JP |
1234 | if ((ic_got_reply & IC_BOOTP) && |
1235 | (ic_proto_enabled & IC_USE_DHCP) && | |
1236 | ic_dhcp_msgtype != DHCPACK) { | |
1da177e4 | 1237 | ic_got_reply = 0; |
2647cffb UKK |
1238 | /* continue on device that got the reply */ |
1239 | d = ic_dev; | |
6c1c36b0 | 1240 | pr_cont(","); |
1da177e4 LT |
1241 | continue; |
1242 | } | |
1243 | #endif /* IPCONFIG_DHCP */ | |
1244 | ||
1245 | if (ic_got_reply) { | |
6c1c36b0 | 1246 | pr_cont(" OK\n"); |
1da177e4 LT |
1247 | break; |
1248 | } | |
1249 | ||
1250 | if ((d = d->next)) | |
1251 | continue; | |
1252 | ||
1253 | if (! --retries) { | |
6c1c36b0 | 1254 | pr_cont(" timed out!\n"); |
1da177e4 LT |
1255 | break; |
1256 | } | |
1257 | ||
1258 | d = ic_first_dev; | |
1259 | ||
1260 | timeout = timeout CONF_TIMEOUT_MULT; | |
1261 | if (timeout > CONF_TIMEOUT_MAX) | |
1262 | timeout = CONF_TIMEOUT_MAX; | |
1263 | ||
6c1c36b0 | 1264 | pr_cont("."); |
1da177e4 LT |
1265 | } |
1266 | ||
1267 | #ifdef IPCONFIG_BOOTP | |
1268 | if (do_bootp) | |
1269 | ic_bootp_cleanup(); | |
1270 | #endif | |
1271 | #ifdef IPCONFIG_RARP | |
1272 | if (do_rarp) | |
1273 | ic_rarp_cleanup(); | |
1274 | #endif | |
1275 | ||
7a1af5d7 | 1276 | if (!ic_got_reply) { |
5a874db4 | 1277 | ic_myaddr = NONE; |
1da177e4 | 1278 | return -1; |
7a1af5d7 | 1279 | } |
1da177e4 | 1280 | |
6c1c36b0 | 1281 | pr_info("IP-Config: Got %s answer from %pI4, my address is %pI4\n", |
e905a9ed | 1282 | ((ic_got_reply & IC_RARP) ? "RARP" |
09605cc1 | 1283 | : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"), |
6c1c36b0 | 1284 | &ic_addrservaddr, &ic_myaddr); |
1da177e4 LT |
1285 | |
1286 | return 0; | |
1287 | } | |
1288 | ||
1289 | #endif /* IPCONFIG_DYNAMIC */ | |
1290 | ||
1291 | #ifdef CONFIG_PROC_FS | |
1292 | ||
1293 | static int pnp_seq_show(struct seq_file *seq, void *v) | |
1294 | { | |
1295 | int i; | |
1296 | ||
1297 | if (ic_proto_used & IC_PROTO) | |
1298 | seq_printf(seq, "#PROTO: %s\n", | |
1299 | (ic_proto_used & IC_RARP) ? "RARP" | |
1300 | : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP"); | |
1301 | else | |
1302 | seq_puts(seq, "#MANUAL\n"); | |
1303 | ||
1304 | if (ic_domain[0]) | |
1305 | seq_printf(seq, | |
1306 | "domain %s\n", ic_domain); | |
1307 | for (i = 0; i < CONF_NAMESERVERS_MAX; i++) { | |
5a874db4 | 1308 | if (ic_nameservers[i] != NONE) |
673d57e7 HH |
1309 | seq_printf(seq, "nameserver %pI4\n", |
1310 | &ic_nameservers[i]); | |
1da177e4 | 1311 | } |
5a874db4 | 1312 | if (ic_servaddr != NONE) |
673d57e7 HH |
1313 | seq_printf(seq, "bootserver %pI4\n", |
1314 | &ic_servaddr); | |
1da177e4 LT |
1315 | return 0; |
1316 | } | |
1317 | ||
1318 | static int pnp_seq_open(struct inode *indoe, struct file *file) | |
1319 | { | |
1320 | return single_open(file, pnp_seq_show, NULL); | |
1321 | } | |
1322 | ||
9a32144e | 1323 | static const struct file_operations pnp_seq_fops = { |
1da177e4 LT |
1324 | .owner = THIS_MODULE, |
1325 | .open = pnp_seq_open, | |
1326 | .read = seq_read, | |
1327 | .llseek = seq_lseek, | |
1328 | .release = single_release, | |
1329 | }; | |
1330 | #endif /* CONFIG_PROC_FS */ | |
1331 | ||
1332 | /* | |
1333 | * Extract IP address from the parameter string if needed. Note that we | |
1334 | * need to have root_server_addr set _before_ IPConfig gets called as it | |
1335 | * can override it. | |
1336 | */ | |
5a874db4 | 1337 | __be32 __init root_nfs_parse_addr(char *name) |
1da177e4 | 1338 | { |
5a874db4 | 1339 | __be32 addr; |
1da177e4 LT |
1340 | int octets = 0; |
1341 | char *cp, *cq; | |
1342 | ||
1343 | cp = cq = name; | |
1344 | while (octets < 4) { | |
1345 | while (*cp >= '0' && *cp <= '9') | |
1346 | cp++; | |
1347 | if (cp == cq || cp - cq > 3) | |
1348 | break; | |
1349 | if (*cp == '.' || octets == 3) | |
1350 | octets++; | |
1351 | if (octets < 4) | |
1352 | cp++; | |
1353 | cq = cp; | |
1354 | } | |
1355 | if (octets == 4 && (*cp == ':' || *cp == '\0')) { | |
1356 | if (*cp == ':') | |
1357 | *cp++ = '\0'; | |
1358 | addr = in_aton(name); | |
1359 | memmove(name, cp, strlen(cp) + 1); | |
1360 | } else | |
5a874db4 | 1361 | addr = NONE; |
1da177e4 LT |
1362 | |
1363 | return addr; | |
1364 | } | |
1365 | ||
964ad81c DM |
1366 | #define DEVICE_WAIT_MAX 12 /* 12 seconds */ |
1367 | ||
1368 | static int __init wait_for_devices(void) | |
1369 | { | |
1370 | int i; | |
1371 | ||
964ad81c DM |
1372 | for (i = 0; i < DEVICE_WAIT_MAX; i++) { |
1373 | struct net_device *dev; | |
1374 | int found = 0; | |
1375 | ||
1376 | rtnl_lock(); | |
1377 | for_each_netdev(&init_net, dev) { | |
3fb72f1e | 1378 | if (ic_is_init_dev(dev)) { |
964ad81c DM |
1379 | found = 1; |
1380 | break; | |
1381 | } | |
1382 | } | |
1383 | rtnl_unlock(); | |
1384 | if (found) | |
1385 | return 0; | |
1386 | ssleep(1); | |
1387 | } | |
1388 | return -ENODEV; | |
1389 | } | |
1390 | ||
1da177e4 LT |
1391 | /* |
1392 | * IP Autoconfig dispatcher. | |
1393 | */ | |
1394 | ||
1395 | static int __init ip_auto_config(void) | |
1396 | { | |
5a874db4 | 1397 | __be32 addr; |
9d8dba6c BZ |
1398 | #ifdef IPCONFIG_DYNAMIC |
1399 | int retries = CONF_OPEN_RETRIES; | |
1400 | #endif | |
964ad81c | 1401 | int err; |
5e953778 | 1402 | unsigned int i; |
1da177e4 LT |
1403 | |
1404 | #ifdef CONFIG_PROC_FS | |
d4beaa66 | 1405 | proc_create("pnp", S_IRUGO, init_net.proc_net, &pnp_seq_fops); |
1da177e4 LT |
1406 | #endif /* CONFIG_PROC_FS */ |
1407 | ||
1408 | if (!ic_enable) | |
1409 | return 0; | |
1410 | ||
09605cc1 | 1411 | pr_debug("IP-Config: Entered.\n"); |
1da177e4 LT |
1412 | #ifdef IPCONFIG_DYNAMIC |
1413 | try_try_again: | |
1414 | #endif | |
964ad81c DM |
1415 | /* Wait for devices to appear */ |
1416 | err = wait_for_devices(); | |
1417 | if (err) | |
1418 | return err; | |
1da177e4 LT |
1419 | |
1420 | /* Setup all network devices */ | |
964ad81c DM |
1421 | err = ic_open_devs(); |
1422 | if (err) | |
1423 | return err; | |
1da177e4 LT |
1424 | |
1425 | /* Give drivers a chance to settle */ | |
3fb72f1e | 1426 | msleep(CONF_POST_OPEN); |
1da177e4 LT |
1427 | |
1428 | /* | |
1429 | * If the config information is insufficient (e.g., our IP address or | |
1430 | * IP address of the boot server is missing or we have multiple network | |
1431 | * interfaces and no default was set), use BOOTP or RARP to get the | |
1432 | * missing values. | |
1433 | */ | |
5a874db4 | 1434 | if (ic_myaddr == NONE || |
1da177e4 | 1435 | #ifdef CONFIG_ROOT_NFS |
9d4fb27d JP |
1436 | (root_server_addr == NONE && |
1437 | ic_servaddr == NONE && | |
1438 | ROOT_DEV == Root_NFS) || | |
1da177e4 LT |
1439 | #endif |
1440 | ic_first_dev->next) { | |
1441 | #ifdef IPCONFIG_DYNAMIC | |
1da177e4 LT |
1442 | if (ic_dynamic() < 0) { |
1443 | ic_close_devs(); | |
1444 | ||
1445 | /* | |
1446 | * I don't know why, but sometimes the | |
1447 | * eepro100 driver (at least) gets upset and | |
1448 | * doesn't work the first time it's opened. | |
1449 | * But then if you close it and reopen it, it | |
1450 | * works just fine. So we need to try that at | |
1451 | * least once before giving up. | |
1452 | * | |
1453 | * Also, if the root will be NFS-mounted, we | |
1454 | * have nowhere to go if DHCP fails. So we | |
1455 | * just have to keep trying forever. | |
1456 | * | |
1457 | * -- Chip | |
1458 | */ | |
1459 | #ifdef CONFIG_ROOT_NFS | |
1460 | if (ROOT_DEV == Root_NFS) { | |
058bd4d2 | 1461 | pr_err("IP-Config: Retrying forever (NFS root)...\n"); |
1da177e4 LT |
1462 | goto try_try_again; |
1463 | } | |
1464 | #endif | |
1465 | ||
1466 | if (--retries) { | |
058bd4d2 | 1467 | pr_err("IP-Config: Reopening network devices...\n"); |
1da177e4 LT |
1468 | goto try_try_again; |
1469 | } | |
1470 | ||
1471 | /* Oh, well. At least we tried. */ | |
058bd4d2 | 1472 | pr_err("IP-Config: Auto-configuration of network failed\n"); |
1da177e4 LT |
1473 | return -1; |
1474 | } | |
1475 | #else /* !DYNAMIC */ | |
058bd4d2 | 1476 | pr_err("IP-Config: Incomplete network configuration information\n"); |
1da177e4 LT |
1477 | ic_close_devs(); |
1478 | return -1; | |
1479 | #endif /* IPCONFIG_DYNAMIC */ | |
1480 | } else { | |
1481 | /* Device selected manually or only one device -> use it */ | |
2647cffb | 1482 | ic_dev = ic_first_dev; |
1da177e4 LT |
1483 | } |
1484 | ||
1485 | addr = root_nfs_parse_addr(root_server_path); | |
5a874db4 | 1486 | if (root_server_addr == NONE) |
1da177e4 LT |
1487 | root_server_addr = addr; |
1488 | ||
1489 | /* | |
25985edc | 1490 | * Use defaults wherever applicable. |
1da177e4 LT |
1491 | */ |
1492 | if (ic_defaults() < 0) | |
1493 | return -1; | |
1494 | ||
1da177e4 LT |
1495 | /* |
1496 | * Record which protocol was actually used. | |
1497 | */ | |
1498 | #ifdef IPCONFIG_DYNAMIC | |
1499 | ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP); | |
1500 | #endif | |
1501 | ||
1502 | #ifndef IPCONFIG_SILENT | |
1503 | /* | |
1504 | * Clue in the operator. | |
1505 | */ | |
058bd4d2 | 1506 | pr_info("IP-Config: Complete:\n"); |
9ecd1c3d CF |
1507 | |
1508 | pr_info(" device=%s, hwaddr=%*phC, ipaddr=%pI4, mask=%pI4, gw=%pI4\n", | |
2647cffb | 1509 | ic_dev->dev->name, ic_dev->dev->addr_len, ic_dev->dev->dev_addr, |
9ecd1c3d | 1510 | &ic_myaddr, &ic_netmask, &ic_gateway); |
058bd4d2 JP |
1511 | pr_info(" host=%s, domain=%s, nis-domain=%s\n", |
1512 | utsname()->nodename, ic_domain, utsname()->domainname); | |
1513 | pr_info(" bootserver=%pI4, rootserver=%pI4, rootpath=%s", | |
1514 | &ic_servaddr, &root_server_addr, root_server_path); | |
9643f455 | 1515 | if (ic_dev_mtu) |
058bd4d2 | 1516 | pr_cont(", mtu=%d", ic_dev_mtu); |
5e953778 CF |
1517 | for (i = 0; i < CONF_NAMESERVERS_MAX; i++) |
1518 | if (ic_nameservers[i] != NONE) { | |
6c1c36b0 | 1519 | pr_cont(" nameserver%u=%pI4", |
5e953778 CF |
1520 | i, &ic_nameservers[i]); |
1521 | break; | |
1522 | } | |
1523 | for (i++; i < CONF_NAMESERVERS_MAX; i++) | |
1524 | if (ic_nameservers[i] != NONE) | |
6c1c36b0 GU |
1525 | pr_cont(", nameserver%u=%pI4", i, &ic_nameservers[i]); |
1526 | pr_cont("\n"); | |
1da177e4 LT |
1527 | #endif /* !SILENT */ |
1528 | ||
9c706a49 UKK |
1529 | /* |
1530 | * Close all network devices except the device we've | |
1531 | * autoconfigured and set up routes. | |
1532 | */ | |
9c706a49 | 1533 | if (ic_setup_if() < 0 || ic_setup_routes() < 0) |
d2d371ae TR |
1534 | err = -1; |
1535 | else | |
1536 | err = 0; | |
9c706a49 | 1537 | |
d2d371ae | 1538 | ic_close_devs(); |
9c706a49 | 1539 | |
d2d371ae | 1540 | return err; |
1da177e4 LT |
1541 | } |
1542 | ||
1543 | late_initcall(ip_auto_config); | |
1544 | ||
1545 | ||
1546 | /* | |
1547 | * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel | |
dc7a0816 | 1548 | * command line parameter. See Documentation/filesystems/nfs/nfsroot.txt. |
1da177e4 LT |
1549 | */ |
1550 | static int __init ic_proto_name(char *name) | |
1551 | { | |
1552 | if (!strcmp(name, "on") || !strcmp(name, "any")) { | |
1553 | return 1; | |
1554 | } | |
a6c05c3d | 1555 | if (!strcmp(name, "off") || !strcmp(name, "none")) { |
92ffb85d | 1556 | return 0; |
a6c05c3d | 1557 | } |
1da177e4 | 1558 | #ifdef CONFIG_IP_PNP_DHCP |
26fb342c LR |
1559 | else if (!strncmp(name, "dhcp", 4)) { |
1560 | char *client_id; | |
1561 | ||
1da177e4 | 1562 | ic_proto_enabled &= ~IC_RARP; |
26fb342c LR |
1563 | client_id = strstr(name, "dhcp,"); |
1564 | if (client_id) { | |
1565 | char *v; | |
1566 | ||
1567 | client_id = client_id + 5; | |
1568 | v = strchr(client_id, ','); | |
1569 | if (!v) | |
1570 | return 1; | |
1571 | *v = 0; | |
1572 | if (kstrtou8(client_id, 0, dhcp_client_identifier)) | |
09605cc1 | 1573 | pr_debug("DHCP: Invalid client identifier type\n"); |
26fb342c LR |
1574 | strncpy(dhcp_client_identifier + 1, v + 1, 251); |
1575 | *v = ','; | |
1576 | } | |
1da177e4 LT |
1577 | return 1; |
1578 | } | |
1579 | #endif | |
1580 | #ifdef CONFIG_IP_PNP_BOOTP | |
1581 | else if (!strcmp(name, "bootp")) { | |
1582 | ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP); | |
1583 | return 1; | |
1584 | } | |
1585 | #endif | |
1586 | #ifdef CONFIG_IP_PNP_RARP | |
1587 | else if (!strcmp(name, "rarp")) { | |
1588 | ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP); | |
1589 | return 1; | |
1590 | } | |
1591 | #endif | |
1592 | #ifdef IPCONFIG_DYNAMIC | |
1593 | else if (!strcmp(name, "both")) { | |
1594 | ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */ | |
1595 | return 1; | |
1596 | } | |
1597 | #endif | |
1598 | return 0; | |
1599 | } | |
1600 | ||
1601 | static int __init ip_auto_config_setup(char *addrs) | |
1602 | { | |
1603 | char *cp, *ip, *dp; | |
1604 | int num = 0; | |
1605 | ||
1606 | ic_set_manually = 1; | |
9cecd07c | 1607 | ic_enable = 1; |
1da177e4 | 1608 | |
92ffb85d AW |
1609 | /* |
1610 | * If any dhcp, bootp etc options are set, leave autoconfig on | |
1611 | * and skip the below static IP processing. | |
1612 | */ | |
1da177e4 LT |
1613 | if (ic_proto_name(addrs)) |
1614 | return 1; | |
1615 | ||
92ffb85d AW |
1616 | /* If no static IP is given, turn off autoconfig and bail. */ |
1617 | if (*addrs == 0 || | |
1618 | strcmp(addrs, "off") == 0 || | |
1619 | strcmp(addrs, "none") == 0) { | |
1620 | ic_enable = 0; | |
1621 | return 1; | |
1622 | } | |
1623 | ||
5e953778 CF |
1624 | ic_nameservers_predef(); |
1625 | ||
92ffb85d | 1626 | /* Parse string for static IP assignment. */ |
1da177e4 LT |
1627 | ip = addrs; |
1628 | while (ip && *ip) { | |
1629 | if ((cp = strchr(ip, ':'))) | |
1630 | *cp++ = '\0'; | |
1631 | if (strlen(ip) > 0) { | |
09605cc1 | 1632 | pr_debug("IP-Config: Parameter #%d: `%s'\n", num, ip); |
1da177e4 LT |
1633 | switch (num) { |
1634 | case 0: | |
e6f1cebf | 1635 | if ((ic_myaddr = in_aton(ip)) == ANY) |
5a874db4 | 1636 | ic_myaddr = NONE; |
1da177e4 LT |
1637 | break; |
1638 | case 1: | |
e6f1cebf | 1639 | if ((ic_servaddr = in_aton(ip)) == ANY) |
5a874db4 | 1640 | ic_servaddr = NONE; |
1da177e4 LT |
1641 | break; |
1642 | case 2: | |
e6f1cebf | 1643 | if ((ic_gateway = in_aton(ip)) == ANY) |
5a874db4 | 1644 | ic_gateway = NONE; |
1da177e4 LT |
1645 | break; |
1646 | case 3: | |
e6f1cebf | 1647 | if ((ic_netmask = in_aton(ip)) == ANY) |
5a874db4 | 1648 | ic_netmask = NONE; |
1da177e4 LT |
1649 | break; |
1650 | case 4: | |
1651 | if ((dp = strchr(ip, '.'))) { | |
1652 | *dp++ = '\0'; | |
e9ff3990 SH |
1653 | strlcpy(utsname()->domainname, dp, |
1654 | sizeof(utsname()->domainname)); | |
1da177e4 | 1655 | } |
e9ff3990 SH |
1656 | strlcpy(utsname()->nodename, ip, |
1657 | sizeof(utsname()->nodename)); | |
1da177e4 LT |
1658 | ic_host_name_set = 1; |
1659 | break; | |
1660 | case 5: | |
1661 | strlcpy(user_dev_name, ip, sizeof(user_dev_name)); | |
1662 | break; | |
1663 | case 6: | |
92ffb85d AW |
1664 | if (ic_proto_name(ip) == 0 && |
1665 | ic_myaddr == NONE) { | |
1666 | ic_enable = 0; | |
1667 | } | |
1da177e4 | 1668 | break; |
5e953778 CF |
1669 | case 7: |
1670 | if (CONF_NAMESERVERS_MAX >= 1) { | |
1671 | ic_nameservers[0] = in_aton(ip); | |
1672 | if (ic_nameservers[0] == ANY) | |
1673 | ic_nameservers[0] = NONE; | |
1674 | } | |
1675 | break; | |
1676 | case 8: | |
1677 | if (CONF_NAMESERVERS_MAX >= 2) { | |
1678 | ic_nameservers[1] = in_aton(ip); | |
1679 | if (ic_nameservers[1] == ANY) | |
1680 | ic_nameservers[1] = NONE; | |
1681 | } | |
1682 | break; | |
1da177e4 LT |
1683 | } |
1684 | } | |
1685 | ip = cp; | |
1686 | num++; | |
1687 | } | |
1688 | ||
1689 | return 1; | |
1690 | } | |
b37f4d7b | 1691 | __setup("ip=", ip_auto_config_setup); |
1da177e4 LT |
1692 | |
1693 | static int __init nfsaddrs_config_setup(char *addrs) | |
1694 | { | |
1695 | return ip_auto_config_setup(addrs); | |
1696 | } | |
b37f4d7b | 1697 | __setup("nfsaddrs=", nfsaddrs_config_setup); |
1da177e4 | 1698 | |
62013dbb RJ |
1699 | static int __init vendor_class_identifier_setup(char *addrs) |
1700 | { | |
1701 | if (strlcpy(vendor_class_identifier, addrs, | |
1702 | sizeof(vendor_class_identifier)) | |
1703 | >= sizeof(vendor_class_identifier)) | |
09605cc1 | 1704 | pr_warn("DHCP: vendorclass too long, truncated to \"%s\"\n", |
058bd4d2 | 1705 | vendor_class_identifier); |
62013dbb RJ |
1706 | return 1; |
1707 | } | |
62013dbb | 1708 | __setup("dhcpclass=", vendor_class_identifier_setup); |