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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> |
457c4cbc | 56 | #include <net/net_namespace.h> |
1da177e4 LT |
57 | #include <net/arp.h> |
58 | #include <net/ip.h> | |
59 | #include <net/ipconfig.h> | |
14c85021 | 60 | #include <net/route.h> |
1da177e4 LT |
61 | |
62 | #include <asm/uaccess.h> | |
63 | #include <net/checksum.h> | |
64 | #include <asm/processor.h> | |
65 | ||
66 | /* Define this to allow debugging output */ | |
67 | #undef IPCONFIG_DEBUG | |
68 | ||
69 | #ifdef IPCONFIG_DEBUG | |
70 | #define DBG(x) printk x | |
71 | #else | |
72 | #define DBG(x) do { } while(0) | |
73 | #endif | |
74 | ||
75 | #if defined(CONFIG_IP_PNP_DHCP) | |
76 | #define IPCONFIG_DHCP | |
77 | #endif | |
78 | #if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_DHCP) | |
79 | #define IPCONFIG_BOOTP | |
80 | #endif | |
81 | #if defined(CONFIG_IP_PNP_RARP) | |
82 | #define IPCONFIG_RARP | |
83 | #endif | |
84 | #if defined(IPCONFIG_BOOTP) || defined(IPCONFIG_RARP) | |
85 | #define IPCONFIG_DYNAMIC | |
86 | #endif | |
87 | ||
88 | /* Define the friendly delay before and after opening net devices */ | |
89 | #define CONF_PRE_OPEN 500 /* Before opening: 1/2 second */ | |
90 | #define CONF_POST_OPEN 1 /* After opening: 1 second */ | |
91 | ||
92 | /* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */ | |
93 | #define CONF_OPEN_RETRIES 2 /* (Re)open devices twice */ | |
94 | #define CONF_SEND_RETRIES 6 /* Send six requests per open */ | |
95 | #define CONF_INTER_TIMEOUT (HZ/2) /* Inter-device timeout: 1/2 second */ | |
96 | #define CONF_BASE_TIMEOUT (HZ*2) /* Initial timeout: 2 seconds */ | |
97 | #define CONF_TIMEOUT_RANDOM (HZ) /* Maximum amount of randomization */ | |
98 | #define CONF_TIMEOUT_MULT *7/4 /* Rate of timeout growth */ | |
99 | #define CONF_TIMEOUT_MAX (HZ*30) /* Maximum allowed timeout */ | |
e905a9ed YH |
100 | #define CONF_NAMESERVERS_MAX 3 /* Maximum number of nameservers |
101 | - '3' from resolv.h */ | |
1da177e4 | 102 | |
09640e63 HH |
103 | #define NONE cpu_to_be32(INADDR_NONE) |
104 | #define ANY cpu_to_be32(INADDR_ANY) | |
1da177e4 LT |
105 | |
106 | /* | |
107 | * Public IP configuration | |
108 | */ | |
109 | ||
110 | /* This is used by platforms which might be able to set the ipconfig | |
111 | * variables using firmware environment vars. If this is set, it will | |
112 | * ignore such firmware variables. | |
113 | */ | |
114 | int ic_set_manually __initdata = 0; /* IPconfig parameters set manually */ | |
115 | ||
116 | static int ic_enable __initdata = 0; /* IP config enabled? */ | |
117 | ||
118 | /* Protocol choice */ | |
119 | int ic_proto_enabled __initdata = 0 | |
120 | #ifdef IPCONFIG_BOOTP | |
121 | | IC_BOOTP | |
122 | #endif | |
123 | #ifdef CONFIG_IP_PNP_DHCP | |
124 | | IC_USE_DHCP | |
125 | #endif | |
126 | #ifdef IPCONFIG_RARP | |
127 | | IC_RARP | |
128 | #endif | |
129 | ; | |
130 | ||
131 | static int ic_host_name_set __initdata = 0; /* Host name set by us? */ | |
132 | ||
5a874db4 AV |
133 | __be32 ic_myaddr = NONE; /* My IP address */ |
134 | static __be32 ic_netmask = NONE; /* Netmask for local subnet */ | |
135 | __be32 ic_gateway = NONE; /* Gateway IP address */ | |
1da177e4 | 136 | |
5a874db4 | 137 | __be32 ic_servaddr = NONE; /* Boot server IP address */ |
1da177e4 | 138 | |
5a874db4 | 139 | __be32 root_server_addr = NONE; /* Address of NFS server */ |
1da177e4 LT |
140 | u8 root_server_path[256] = { 0, }; /* Path to mount as root */ |
141 | ||
2513dfb8 CF |
142 | u32 ic_dev_xid; /* Device under configuration */ |
143 | ||
1b0b04f9 DM |
144 | /* vendor class identifier */ |
145 | static char vendor_class_identifier[253] __initdata; | |
62013dbb | 146 | |
1da177e4 LT |
147 | /* Persistent data: */ |
148 | ||
149 | static int ic_proto_used; /* Protocol used, if any */ | |
5a874db4 | 150 | static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */ |
1da177e4 LT |
151 | static u8 ic_domain[64]; /* DNS (not NIS) domain name */ |
152 | ||
153 | /* | |
154 | * Private state. | |
155 | */ | |
156 | ||
157 | /* Name of user-selected boot device */ | |
158 | static char user_dev_name[IFNAMSIZ] __initdata = { 0, }; | |
159 | ||
160 | /* Protocols supported by available interfaces */ | |
161 | static int ic_proto_have_if __initdata = 0; | |
162 | ||
9643f455 CF |
163 | /* MTU for boot device */ |
164 | static int ic_dev_mtu __initdata = 0; | |
165 | ||
1da177e4 LT |
166 | #ifdef IPCONFIG_DYNAMIC |
167 | static DEFINE_SPINLOCK(ic_recv_lock); | |
168 | static volatile int ic_got_reply __initdata = 0; /* Proto(s) that replied */ | |
169 | #endif | |
170 | #ifdef IPCONFIG_DHCP | |
171 | static int ic_dhcp_msgtype __initdata = 0; /* DHCP msg type received */ | |
172 | #endif | |
173 | ||
174 | ||
175 | /* | |
176 | * Network devices | |
177 | */ | |
178 | ||
179 | struct ic_device { | |
180 | struct ic_device *next; | |
181 | struct net_device *dev; | |
182 | unsigned short flags; | |
183 | short able; | |
5a874db4 | 184 | __be32 xid; |
1da177e4 LT |
185 | }; |
186 | ||
187 | static struct ic_device *ic_first_dev __initdata = NULL;/* List of open device */ | |
188 | static struct net_device *ic_dev __initdata = NULL; /* Selected device */ | |
189 | ||
190 | static int __init ic_open_devs(void) | |
191 | { | |
192 | struct ic_device *d, **last; | |
193 | struct net_device *dev; | |
194 | unsigned short oflags; | |
195 | ||
196 | last = &ic_first_dev; | |
6756ae4b | 197 | rtnl_lock(); |
1da177e4 LT |
198 | |
199 | /* bring loopback device up first */ | |
0cc217e1 EB |
200 | for_each_netdev(&init_net, dev) { |
201 | if (!(dev->flags & IFF_LOOPBACK)) | |
202 | continue; | |
203 | if (dev_change_flags(dev, dev->flags | IFF_UP) < 0) | |
204 | printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name); | |
205 | } | |
1da177e4 | 206 | |
881d966b | 207 | for_each_netdev(&init_net, dev) { |
0cc217e1 | 208 | if (dev->flags & IFF_LOOPBACK) |
1da177e4 LT |
209 | continue; |
210 | if (user_dev_name[0] ? !strcmp(dev->name, user_dev_name) : | |
211 | (!(dev->flags & IFF_LOOPBACK) && | |
212 | (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) && | |
213 | strncmp(dev->name, "dummy", 5))) { | |
214 | int able = 0; | |
215 | if (dev->mtu >= 364) | |
216 | able |= IC_BOOTP; | |
217 | else | |
218 | printk(KERN_WARNING "DHCP/BOOTP: Ignoring device %s, MTU %d too small", dev->name, dev->mtu); | |
219 | if (!(dev->flags & IFF_NOARP)) | |
220 | able |= IC_RARP; | |
221 | able &= ic_proto_enabled; | |
222 | if (ic_proto_enabled && !able) | |
223 | continue; | |
224 | oflags = dev->flags; | |
225 | if (dev_change_flags(dev, oflags | IFF_UP) < 0) { | |
226 | printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name); | |
227 | continue; | |
228 | } | |
229 | if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) { | |
6756ae4b | 230 | rtnl_unlock(); |
1da177e4 LT |
231 | return -1; |
232 | } | |
233 | d->dev = dev; | |
234 | *last = d; | |
235 | last = &d->next; | |
236 | d->flags = oflags; | |
237 | d->able = able; | |
238 | if (able & IC_BOOTP) | |
5a874db4 | 239 | get_random_bytes(&d->xid, sizeof(__be32)); |
1da177e4 LT |
240 | else |
241 | d->xid = 0; | |
242 | ic_proto_have_if |= able; | |
243 | DBG(("IP-Config: %s UP (able=%d, xid=%08x)\n", | |
244 | dev->name, able, d->xid)); | |
245 | } | |
246 | } | |
6756ae4b | 247 | rtnl_unlock(); |
1da177e4 LT |
248 | |
249 | *last = NULL; | |
250 | ||
251 | if (!ic_first_dev) { | |
252 | if (user_dev_name[0]) | |
253 | printk(KERN_ERR "IP-Config: Device `%s' not found.\n", user_dev_name); | |
254 | else | |
255 | printk(KERN_ERR "IP-Config: No network devices available.\n"); | |
256 | return -1; | |
257 | } | |
258 | return 0; | |
259 | } | |
260 | ||
261 | static void __init ic_close_devs(void) | |
262 | { | |
263 | struct ic_device *d, *next; | |
264 | struct net_device *dev; | |
265 | ||
6756ae4b | 266 | rtnl_lock(); |
1da177e4 LT |
267 | next = ic_first_dev; |
268 | while ((d = next)) { | |
269 | next = d->next; | |
270 | dev = d->dev; | |
271 | if (dev != ic_dev) { | |
272 | DBG(("IP-Config: Downing %s\n", dev->name)); | |
273 | dev_change_flags(dev, d->flags); | |
274 | } | |
275 | kfree(d); | |
276 | } | |
6756ae4b | 277 | rtnl_unlock(); |
1da177e4 LT |
278 | } |
279 | ||
280 | /* | |
281 | * Interface to various network functions. | |
282 | */ | |
283 | ||
284 | static inline void | |
5a874db4 | 285 | set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port) |
1da177e4 LT |
286 | { |
287 | sin->sin_family = AF_INET; | |
288 | sin->sin_addr.s_addr = addr; | |
289 | sin->sin_port = port; | |
290 | } | |
291 | ||
9643f455 | 292 | static int __init ic_devinet_ioctl(unsigned int cmd, struct ifreq *arg) |
1da177e4 LT |
293 | { |
294 | int res; | |
295 | ||
296 | mm_segment_t oldfs = get_fs(); | |
297 | set_fs(get_ds()); | |
e5b13cb1 | 298 | res = devinet_ioctl(&init_net, cmd, (struct ifreq __user *) arg); |
1da177e4 LT |
299 | set_fs(oldfs); |
300 | return res; | |
301 | } | |
302 | ||
9643f455 CF |
303 | static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg) |
304 | { | |
305 | int res; | |
306 | ||
307 | mm_segment_t oldfs = get_fs(); | |
308 | set_fs(get_ds()); | |
309 | res = dev_ioctl(&init_net, cmd, (struct ifreq __user *) arg); | |
310 | set_fs(oldfs); | |
311 | return res; | |
312 | } | |
313 | ||
1da177e4 LT |
314 | static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg) |
315 | { | |
316 | int res; | |
317 | ||
318 | mm_segment_t oldfs = get_fs(); | |
319 | set_fs(get_ds()); | |
1bad118a | 320 | res = ip_rt_ioctl(&init_net, cmd, (void __user *) arg); |
1da177e4 LT |
321 | set_fs(oldfs); |
322 | return res; | |
323 | } | |
324 | ||
325 | /* | |
326 | * Set up interface addresses and routes. | |
327 | */ | |
328 | ||
329 | static int __init ic_setup_if(void) | |
330 | { | |
331 | struct ifreq ir; | |
332 | struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr; | |
333 | int err; | |
334 | ||
335 | memset(&ir, 0, sizeof(ir)); | |
336 | strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name); | |
337 | set_sockaddr(sin, ic_myaddr, 0); | |
9643f455 | 338 | if ((err = ic_devinet_ioctl(SIOCSIFADDR, &ir)) < 0) { |
1da177e4 LT |
339 | printk(KERN_ERR "IP-Config: Unable to set interface address (%d).\n", err); |
340 | return -1; | |
341 | } | |
342 | set_sockaddr(sin, ic_netmask, 0); | |
9643f455 | 343 | if ((err = ic_devinet_ioctl(SIOCSIFNETMASK, &ir)) < 0) { |
1da177e4 LT |
344 | printk(KERN_ERR "IP-Config: Unable to set interface netmask (%d).\n", err); |
345 | return -1; | |
346 | } | |
347 | set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0); | |
9643f455 | 348 | if ((err = ic_devinet_ioctl(SIOCSIFBRDADDR, &ir)) < 0) { |
1da177e4 LT |
349 | printk(KERN_ERR "IP-Config: Unable to set interface broadcast address (%d).\n", err); |
350 | return -1; | |
351 | } | |
9643f455 CF |
352 | /* Handle the case where we need non-standard MTU on the boot link (a network |
353 | * using jumbo frames, for instance). If we can't set the mtu, don't error | |
354 | * out, we'll try to muddle along. | |
355 | */ | |
356 | if (ic_dev_mtu != 0) { | |
357 | strcpy(ir.ifr_name, ic_dev->name); | |
358 | ir.ifr_mtu = ic_dev_mtu; | |
359 | if ((err = ic_dev_ioctl(SIOCSIFMTU, &ir)) < 0) | |
360 | printk(KERN_ERR "IP-Config: Unable to set interface mtu to %d (%d).\n", | |
361 | ic_dev_mtu, err); | |
362 | } | |
1da177e4 LT |
363 | return 0; |
364 | } | |
365 | ||
366 | static int __init ic_setup_routes(void) | |
367 | { | |
368 | /* No need to setup device routes, only the default route... */ | |
369 | ||
5a874db4 | 370 | if (ic_gateway != NONE) { |
1da177e4 LT |
371 | struct rtentry rm; |
372 | int err; | |
373 | ||
374 | memset(&rm, 0, sizeof(rm)); | |
375 | if ((ic_gateway ^ ic_myaddr) & ic_netmask) { | |
376 | printk(KERN_ERR "IP-Config: Gateway not on directly connected network.\n"); | |
377 | return -1; | |
378 | } | |
379 | set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0); | |
380 | set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0); | |
381 | set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0); | |
382 | rm.rt_flags = RTF_UP | RTF_GATEWAY; | |
383 | if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) { | |
384 | printk(KERN_ERR "IP-Config: Cannot add default route (%d).\n", err); | |
385 | return -1; | |
386 | } | |
387 | } | |
388 | ||
389 | return 0; | |
390 | } | |
391 | ||
392 | /* | |
393 | * Fill in default values for all missing parameters. | |
394 | */ | |
395 | ||
396 | static int __init ic_defaults(void) | |
397 | { | |
398 | /* | |
399 | * At this point we have no userspace running so need not | |
400 | * claim locks on system_utsname | |
401 | */ | |
e905a9ed | 402 | |
1da177e4 | 403 | if (!ic_host_name_set) |
673d57e7 | 404 | sprintf(init_utsname()->nodename, "%pI4", &ic_myaddr); |
1da177e4 | 405 | |
5a874db4 | 406 | if (root_server_addr == NONE) |
1da177e4 LT |
407 | root_server_addr = ic_servaddr; |
408 | ||
5a874db4 | 409 | if (ic_netmask == NONE) { |
1da177e4 LT |
410 | if (IN_CLASSA(ntohl(ic_myaddr))) |
411 | ic_netmask = htonl(IN_CLASSA_NET); | |
412 | else if (IN_CLASSB(ntohl(ic_myaddr))) | |
413 | ic_netmask = htonl(IN_CLASSB_NET); | |
414 | else if (IN_CLASSC(ntohl(ic_myaddr))) | |
415 | ic_netmask = htonl(IN_CLASSC_NET); | |
416 | else { | |
673d57e7 HH |
417 | printk(KERN_ERR "IP-Config: Unable to guess netmask for address %pI4\n", |
418 | &ic_myaddr); | |
1da177e4 LT |
419 | return -1; |
420 | } | |
673d57e7 | 421 | printk("IP-Config: Guessing netmask %pI4\n", &ic_netmask); |
1da177e4 LT |
422 | } |
423 | ||
424 | return 0; | |
425 | } | |
426 | ||
427 | /* | |
428 | * RARP support. | |
429 | */ | |
430 | ||
431 | #ifdef IPCONFIG_RARP | |
432 | ||
f2ccd8fa | 433 | static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); |
1da177e4 LT |
434 | |
435 | static struct packet_type rarp_packet_type __initdata = { | |
09640e63 | 436 | .type = cpu_to_be16(ETH_P_RARP), |
1da177e4 LT |
437 | .func = ic_rarp_recv, |
438 | }; | |
439 | ||
45e741b8 | 440 | static inline void __init ic_rarp_init(void) |
1da177e4 LT |
441 | { |
442 | dev_add_pack(&rarp_packet_type); | |
443 | } | |
444 | ||
45e741b8 | 445 | static inline void __init ic_rarp_cleanup(void) |
1da177e4 LT |
446 | { |
447 | dev_remove_pack(&rarp_packet_type); | |
448 | } | |
449 | ||
450 | /* | |
451 | * Process received RARP packet. | |
452 | */ | |
453 | static int __init | |
f2ccd8fa | 454 | ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) |
1da177e4 LT |
455 | { |
456 | struct arphdr *rarp; | |
457 | unsigned char *rarp_ptr; | |
5a874db4 | 458 | __be32 sip, tip; |
1da177e4 LT |
459 | unsigned char *sha, *tha; /* s for "source", t for "target" */ |
460 | struct ic_device *d; | |
461 | ||
721499e8 | 462 | if (!net_eq(dev_net(dev), &init_net)) |
e730c155 EB |
463 | goto drop; |
464 | ||
1da177e4 LT |
465 | if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) |
466 | return NET_RX_DROP; | |
467 | ||
468 | if (!pskb_may_pull(skb, sizeof(struct arphdr))) | |
469 | goto drop; | |
470 | ||
471 | /* Basic sanity checks can be done without the lock. */ | |
9c70220b | 472 | rarp = (struct arphdr *)skb_transport_header(skb); |
1da177e4 LT |
473 | |
474 | /* If this test doesn't pass, it's not IP, or we should | |
475 | * ignore it anyway. | |
476 | */ | |
477 | if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd)) | |
478 | goto drop; | |
479 | ||
480 | /* If it's not a RARP reply, delete it. */ | |
481 | if (rarp->ar_op != htons(ARPOP_RREPLY)) | |
482 | goto drop; | |
483 | ||
484 | /* If it's not Ethernet, delete it. */ | |
485 | if (rarp->ar_pro != htons(ETH_P_IP)) | |
486 | goto drop; | |
487 | ||
988b7050 | 488 | if (!pskb_may_pull(skb, arp_hdr_len(dev))) |
1da177e4 LT |
489 | goto drop; |
490 | ||
491 | /* OK, it is all there and looks valid, process... */ | |
9c70220b | 492 | rarp = (struct arphdr *)skb_transport_header(skb); |
1da177e4 LT |
493 | rarp_ptr = (unsigned char *) (rarp + 1); |
494 | ||
495 | /* One reply at a time, please. */ | |
496 | spin_lock(&ic_recv_lock); | |
497 | ||
498 | /* If we already have a reply, just drop the packet */ | |
499 | if (ic_got_reply) | |
500 | goto drop_unlock; | |
501 | ||
502 | /* Find the ic_device that the packet arrived on */ | |
503 | d = ic_first_dev; | |
504 | while (d && d->dev != dev) | |
505 | d = d->next; | |
506 | if (!d) | |
507 | goto drop_unlock; /* should never happen */ | |
508 | ||
509 | /* Extract variable-width fields */ | |
510 | sha = rarp_ptr; | |
511 | rarp_ptr += dev->addr_len; | |
512 | memcpy(&sip, rarp_ptr, 4); | |
513 | rarp_ptr += 4; | |
514 | tha = rarp_ptr; | |
515 | rarp_ptr += dev->addr_len; | |
516 | memcpy(&tip, rarp_ptr, 4); | |
517 | ||
518 | /* Discard packets which are not meant for us. */ | |
519 | if (memcmp(tha, dev->dev_addr, dev->addr_len)) | |
520 | goto drop_unlock; | |
521 | ||
522 | /* Discard packets which are not from specified server. */ | |
5a874db4 | 523 | if (ic_servaddr != NONE && ic_servaddr != sip) |
1da177e4 LT |
524 | goto drop_unlock; |
525 | ||
526 | /* We have a winner! */ | |
527 | ic_dev = dev; | |
5a874db4 | 528 | if (ic_myaddr == NONE) |
1da177e4 LT |
529 | ic_myaddr = tip; |
530 | ic_servaddr = sip; | |
531 | ic_got_reply = IC_RARP; | |
532 | ||
533 | drop_unlock: | |
534 | /* Show's over. Nothing to see here. */ | |
535 | spin_unlock(&ic_recv_lock); | |
536 | ||
537 | drop: | |
538 | /* Throw the packet out. */ | |
539 | kfree_skb(skb); | |
540 | return 0; | |
541 | } | |
542 | ||
543 | ||
544 | /* | |
545 | * Send RARP request packet over a single interface. | |
546 | */ | |
547 | static void __init ic_rarp_send_if(struct ic_device *d) | |
548 | { | |
549 | struct net_device *dev = d->dev; | |
550 | arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL, | |
551 | dev->dev_addr, dev->dev_addr); | |
552 | } | |
553 | #endif | |
554 | ||
555 | /* | |
556 | * DHCP/BOOTP support. | |
557 | */ | |
558 | ||
559 | #ifdef IPCONFIG_BOOTP | |
560 | ||
561 | struct bootp_pkt { /* BOOTP packet format */ | |
562 | struct iphdr iph; /* IP header */ | |
563 | struct udphdr udph; /* UDP header */ | |
564 | u8 op; /* 1=request, 2=reply */ | |
565 | u8 htype; /* HW address type */ | |
566 | u8 hlen; /* HW address length */ | |
567 | u8 hops; /* Used only by gateways */ | |
5a874db4 AV |
568 | __be32 xid; /* Transaction ID */ |
569 | __be16 secs; /* Seconds since we started */ | |
570 | __be16 flags; /* Just what it says */ | |
571 | __be32 client_ip; /* Client's IP address if known */ | |
572 | __be32 your_ip; /* Assigned IP address */ | |
573 | __be32 server_ip; /* (Next, e.g. NFS) Server's IP address */ | |
574 | __be32 relay_ip; /* IP address of BOOTP relay */ | |
1da177e4 LT |
575 | u8 hw_addr[16]; /* Client's HW address */ |
576 | u8 serv_name[64]; /* Server host name */ | |
577 | u8 boot_file[128]; /* Name of boot file */ | |
578 | u8 exten[312]; /* DHCP options / BOOTP vendor extensions */ | |
579 | }; | |
580 | ||
581 | /* packet ops */ | |
582 | #define BOOTP_REQUEST 1 | |
583 | #define BOOTP_REPLY 2 | |
584 | ||
585 | /* DHCP message types */ | |
586 | #define DHCPDISCOVER 1 | |
587 | #define DHCPOFFER 2 | |
588 | #define DHCPREQUEST 3 | |
589 | #define DHCPDECLINE 4 | |
590 | #define DHCPACK 5 | |
591 | #define DHCPNAK 6 | |
592 | #define DHCPRELEASE 7 | |
593 | #define DHCPINFORM 8 | |
594 | ||
f2ccd8fa | 595 | static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); |
1da177e4 LT |
596 | |
597 | static struct packet_type bootp_packet_type __initdata = { | |
09640e63 | 598 | .type = cpu_to_be16(ETH_P_IP), |
1da177e4 LT |
599 | .func = ic_bootp_recv, |
600 | }; | |
601 | ||
602 | ||
603 | /* | |
604 | * Initialize DHCP/BOOTP extension fields in the request. | |
605 | */ | |
606 | ||
607 | static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 }; | |
608 | ||
609 | #ifdef IPCONFIG_DHCP | |
610 | ||
611 | static void __init | |
612 | ic_dhcp_init_options(u8 *options) | |
613 | { | |
5a874db4 | 614 | u8 mt = ((ic_servaddr == NONE) |
1da177e4 LT |
615 | ? DHCPDISCOVER : DHCPREQUEST); |
616 | u8 *e = options; | |
62013dbb | 617 | int len; |
1da177e4 LT |
618 | |
619 | #ifdef IPCONFIG_DEBUG | |
620 | printk("DHCP: Sending message type %d\n", mt); | |
621 | #endif | |
622 | ||
623 | memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ | |
624 | e += 4; | |
625 | ||
626 | *e++ = 53; /* DHCP message type */ | |
627 | *e++ = 1; | |
628 | *e++ = mt; | |
629 | ||
630 | if (mt == DHCPREQUEST) { | |
631 | *e++ = 54; /* Server ID (IP address) */ | |
632 | *e++ = 4; | |
633 | memcpy(e, &ic_servaddr, 4); | |
634 | e += 4; | |
635 | ||
636 | *e++ = 50; /* Requested IP address */ | |
637 | *e++ = 4; | |
638 | memcpy(e, &ic_myaddr, 4); | |
639 | e += 4; | |
640 | } | |
641 | ||
642 | /* always? */ | |
643 | { | |
644 | static const u8 ic_req_params[] = { | |
645 | 1, /* Subnet mask */ | |
646 | 3, /* Default gateway */ | |
647 | 6, /* DNS server */ | |
648 | 12, /* Host name */ | |
649 | 15, /* Domain name */ | |
650 | 17, /* Boot path */ | |
9643f455 | 651 | 26, /* MTU */ |
1da177e4 LT |
652 | 40, /* NIS domain name */ |
653 | }; | |
654 | ||
655 | *e++ = 55; /* Parameter request list */ | |
656 | *e++ = sizeof(ic_req_params); | |
657 | memcpy(e, ic_req_params, sizeof(ic_req_params)); | |
658 | e += sizeof(ic_req_params); | |
62013dbb RJ |
659 | |
660 | if (*vendor_class_identifier) { | |
661 | printk(KERN_INFO "DHCP: sending class identifier \"%s\"\n", | |
662 | vendor_class_identifier); | |
663 | *e++ = 60; /* Class-identifier */ | |
664 | len = strlen(vendor_class_identifier); | |
665 | *e++ = len; | |
666 | memcpy(e, vendor_class_identifier, len); | |
667 | e += len; | |
668 | } | |
1da177e4 LT |
669 | } |
670 | ||
671 | *e++ = 255; /* End of the list */ | |
672 | } | |
673 | ||
674 | #endif /* IPCONFIG_DHCP */ | |
675 | ||
676 | static void __init ic_bootp_init_ext(u8 *e) | |
677 | { | |
678 | memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ | |
679 | e += 4; | |
680 | *e++ = 1; /* Subnet mask request */ | |
681 | *e++ = 4; | |
682 | e += 4; | |
683 | *e++ = 3; /* Default gateway request */ | |
684 | *e++ = 4; | |
685 | e += 4; | |
686 | *e++ = 5; /* Name server request */ | |
687 | *e++ = 8; | |
688 | e += 8; | |
689 | *e++ = 12; /* Host name request */ | |
690 | *e++ = 32; | |
691 | e += 32; | |
692 | *e++ = 40; /* NIS Domain name request */ | |
693 | *e++ = 32; | |
694 | e += 32; | |
695 | *e++ = 17; /* Boot path */ | |
696 | *e++ = 40; | |
697 | e += 40; | |
698 | ||
e905a9ed | 699 | *e++ = 57; /* set extension buffer size for reply */ |
1da177e4 | 700 | *e++ = 2; |
e905a9ed | 701 | *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */ |
1da177e4 LT |
702 | *e++ = 150; |
703 | ||
704 | *e++ = 255; /* End of the list */ | |
705 | } | |
706 | ||
707 | ||
708 | /* | |
709 | * Initialize the DHCP/BOOTP mechanism. | |
710 | */ | |
45e741b8 | 711 | static inline void __init ic_bootp_init(void) |
1da177e4 LT |
712 | { |
713 | int i; | |
714 | ||
715 | for (i = 0; i < CONF_NAMESERVERS_MAX; i++) | |
5a874db4 | 716 | ic_nameservers[i] = NONE; |
1da177e4 LT |
717 | |
718 | dev_add_pack(&bootp_packet_type); | |
719 | } | |
720 | ||
721 | ||
722 | /* | |
723 | * DHCP/BOOTP cleanup. | |
724 | */ | |
45e741b8 | 725 | static inline void __init ic_bootp_cleanup(void) |
1da177e4 LT |
726 | { |
727 | dev_remove_pack(&bootp_packet_type); | |
728 | } | |
729 | ||
730 | ||
731 | /* | |
732 | * Send DHCP/BOOTP request to single interface. | |
733 | */ | |
734 | static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff) | |
735 | { | |
736 | struct net_device *dev = d->dev; | |
737 | struct sk_buff *skb; | |
738 | struct bootp_pkt *b; | |
1da177e4 LT |
739 | struct iphdr *h; |
740 | ||
741 | /* Allocate packet */ | |
f5184d26 JB |
742 | skb = alloc_skb(sizeof(struct bootp_pkt) + LL_ALLOCATED_SPACE(dev) + 15, |
743 | GFP_KERNEL); | |
1da177e4 LT |
744 | if (!skb) |
745 | return; | |
f5184d26 | 746 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); |
1da177e4 LT |
747 | b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt)); |
748 | memset(b, 0, sizeof(struct bootp_pkt)); | |
749 | ||
750 | /* Construct IP header */ | |
04b964db | 751 | skb_reset_network_header(skb); |
eddc9ec5 | 752 | h = ip_hdr(skb); |
1da177e4 LT |
753 | h->version = 4; |
754 | h->ihl = 5; | |
755 | h->tot_len = htons(sizeof(struct bootp_pkt)); | |
756 | h->frag_off = htons(IP_DF); | |
757 | h->ttl = 64; | |
758 | h->protocol = IPPROTO_UDP; | |
5a874db4 | 759 | h->daddr = htonl(INADDR_BROADCAST); |
1da177e4 LT |
760 | h->check = ip_fast_csum((unsigned char *) h, h->ihl); |
761 | ||
762 | /* Construct UDP header */ | |
763 | b->udph.source = htons(68); | |
764 | b->udph.dest = htons(67); | |
765 | b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr)); | |
766 | /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */ | |
767 | ||
768 | /* Construct DHCP/BOOTP header */ | |
769 | b->op = BOOTP_REQUEST; | |
770 | if (dev->type < 256) /* check for false types */ | |
771 | b->htype = dev->type; | |
772 | else if (dev->type == ARPHRD_IEEE802_TR) /* fix for token ring */ | |
773 | b->htype = ARPHRD_IEEE802; | |
774 | else if (dev->type == ARPHRD_FDDI) | |
775 | b->htype = ARPHRD_ETHER; | |
776 | else { | |
777 | printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name); | |
778 | b->htype = dev->type; /* can cause undefined behavior */ | |
779 | } | |
dea75bdf SH |
780 | |
781 | /* server_ip and your_ip address are both already zero per RFC2131 */ | |
1da177e4 | 782 | b->hlen = dev->addr_len; |
1da177e4 LT |
783 | memcpy(b->hw_addr, dev->dev_addr, dev->addr_len); |
784 | b->secs = htons(jiffies_diff / HZ); | |
785 | b->xid = d->xid; | |
786 | ||
787 | /* add DHCP options or BOOTP extensions */ | |
788 | #ifdef IPCONFIG_DHCP | |
789 | if (ic_proto_enabled & IC_USE_DHCP) | |
790 | ic_dhcp_init_options(b->exten); | |
791 | else | |
792 | #endif | |
793 | ic_bootp_init_ext(b->exten); | |
794 | ||
795 | /* Chain packet down the line... */ | |
796 | skb->dev = dev; | |
797 | skb->protocol = htons(ETH_P_IP); | |
0c4e8581 SH |
798 | if (dev_hard_header(skb, dev, ntohs(skb->protocol), |
799 | dev->broadcast, dev->dev_addr, skb->len) < 0 || | |
1da177e4 LT |
800 | dev_queue_xmit(skb) < 0) |
801 | printk("E"); | |
802 | } | |
803 | ||
804 | ||
805 | /* | |
806 | * Copy BOOTP-supplied string if not already set. | |
807 | */ | |
808 | static int __init ic_bootp_string(char *dest, char *src, int len, int max) | |
809 | { | |
810 | if (!len) | |
811 | return 0; | |
812 | if (len > max-1) | |
813 | len = max-1; | |
814 | memcpy(dest, src, len); | |
815 | dest[len] = '\0'; | |
816 | return 1; | |
817 | } | |
818 | ||
819 | ||
820 | /* | |
821 | * Process BOOTP extensions. | |
822 | */ | |
823 | static void __init ic_do_bootp_ext(u8 *ext) | |
824 | { | |
825 | u8 servers; | |
826 | int i; | |
9643f455 | 827 | u16 mtu; |
1da177e4 LT |
828 | |
829 | #ifdef IPCONFIG_DEBUG | |
830 | u8 *c; | |
831 | ||
832 | printk("DHCP/BOOTP: Got extension %d:",*ext); | |
132adf54 | 833 | for (c=ext+2; c<ext+2+ext[1]; c++) |
1da177e4 LT |
834 | printk(" %02x", *c); |
835 | printk("\n"); | |
836 | #endif | |
837 | ||
838 | switch (*ext++) { | |
839 | case 1: /* Subnet mask */ | |
5a874db4 | 840 | if (ic_netmask == NONE) |
1da177e4 LT |
841 | memcpy(&ic_netmask, ext+1, 4); |
842 | break; | |
843 | case 3: /* Default gateway */ | |
5a874db4 | 844 | if (ic_gateway == NONE) |
1da177e4 LT |
845 | memcpy(&ic_gateway, ext+1, 4); |
846 | break; | |
847 | case 6: /* DNS server */ | |
848 | servers= *ext/4; | |
849 | if (servers > CONF_NAMESERVERS_MAX) | |
850 | servers = CONF_NAMESERVERS_MAX; | |
851 | for (i = 0; i < servers; i++) { | |
5a874db4 | 852 | if (ic_nameservers[i] == NONE) |
1da177e4 LT |
853 | memcpy(&ic_nameservers[i], ext+1+4*i, 4); |
854 | } | |
855 | break; | |
856 | case 12: /* Host name */ | |
e9ff3990 | 857 | ic_bootp_string(utsname()->nodename, ext+1, *ext, __NEW_UTS_LEN); |
1da177e4 LT |
858 | ic_host_name_set = 1; |
859 | break; | |
860 | case 15: /* Domain name (DNS) */ | |
861 | ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain)); | |
862 | break; | |
863 | case 17: /* Root path */ | |
864 | if (!root_server_path[0]) | |
865 | ic_bootp_string(root_server_path, ext+1, *ext, sizeof(root_server_path)); | |
866 | break; | |
9643f455 CF |
867 | case 26: /* Interface MTU */ |
868 | memcpy(&mtu, ext+1, sizeof(mtu)); | |
869 | ic_dev_mtu = ntohs(mtu); | |
870 | break; | |
1da177e4 | 871 | case 40: /* NIS Domain name (_not_ DNS) */ |
e9ff3990 | 872 | ic_bootp_string(utsname()->domainname, ext+1, *ext, __NEW_UTS_LEN); |
1da177e4 LT |
873 | break; |
874 | } | |
875 | } | |
876 | ||
877 | ||
878 | /* | |
879 | * Receive BOOTP reply. | |
880 | */ | |
f2ccd8fa | 881 | 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 |
882 | { |
883 | struct bootp_pkt *b; | |
884 | struct iphdr *h; | |
885 | struct ic_device *d; | |
886 | int len, ext_len; | |
887 | ||
721499e8 | 888 | if (!net_eq(dev_net(dev), &init_net)) |
e730c155 EB |
889 | goto drop; |
890 | ||
1da177e4 LT |
891 | /* Perform verifications before taking the lock. */ |
892 | if (skb->pkt_type == PACKET_OTHERHOST) | |
893 | goto drop; | |
894 | ||
895 | if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) | |
896 | return NET_RX_DROP; | |
897 | ||
898 | if (!pskb_may_pull(skb, | |
899 | sizeof(struct iphdr) + | |
900 | sizeof(struct udphdr))) | |
901 | goto drop; | |
902 | ||
eddc9ec5 | 903 | b = (struct bootp_pkt *)skb_network_header(skb); |
1da177e4 LT |
904 | h = &b->iph; |
905 | ||
906 | if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP) | |
907 | goto drop; | |
908 | ||
909 | /* Fragments are not supported */ | |
910 | if (h->frag_off & htons(IP_OFFSET | IP_MF)) { | |
911 | if (net_ratelimit()) | |
912 | printk(KERN_ERR "DHCP/BOOTP: Ignoring fragmented " | |
913 | "reply.\n"); | |
914 | goto drop; | |
915 | } | |
916 | ||
917 | if (skb->len < ntohs(h->tot_len)) | |
918 | goto drop; | |
919 | ||
920 | if (ip_fast_csum((char *) h, h->ihl)) | |
921 | goto drop; | |
922 | ||
923 | if (b->udph.source != htons(67) || b->udph.dest != htons(68)) | |
924 | goto drop; | |
925 | ||
926 | if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr)) | |
927 | goto drop; | |
928 | ||
929 | len = ntohs(b->udph.len) - sizeof(struct udphdr); | |
930 | ext_len = len - (sizeof(*b) - | |
931 | sizeof(struct iphdr) - | |
932 | sizeof(struct udphdr) - | |
933 | sizeof(b->exten)); | |
934 | if (ext_len < 0) | |
935 | goto drop; | |
936 | ||
937 | /* Ok the front looks good, make sure we can get at the rest. */ | |
938 | if (!pskb_may_pull(skb, skb->len)) | |
939 | goto drop; | |
940 | ||
eddc9ec5 | 941 | b = (struct bootp_pkt *)skb_network_header(skb); |
1da177e4 LT |
942 | h = &b->iph; |
943 | ||
944 | /* One reply at a time, please. */ | |
945 | spin_lock(&ic_recv_lock); | |
946 | ||
947 | /* If we already have a reply, just drop the packet */ | |
948 | if (ic_got_reply) | |
949 | goto drop_unlock; | |
950 | ||
951 | /* Find the ic_device that the packet arrived on */ | |
952 | d = ic_first_dev; | |
953 | while (d && d->dev != dev) | |
954 | d = d->next; | |
955 | if (!d) | |
956 | goto drop_unlock; /* should never happen */ | |
957 | ||
958 | /* Is it a reply to our BOOTP request? */ | |
959 | if (b->op != BOOTP_REPLY || | |
960 | b->xid != d->xid) { | |
961 | if (net_ratelimit()) | |
962 | printk(KERN_ERR "DHCP/BOOTP: Reply not for us, " | |
963 | "op[%x] xid[%x]\n", | |
964 | b->op, b->xid); | |
965 | goto drop_unlock; | |
966 | } | |
967 | ||
2513dfb8 CF |
968 | /* Is it a reply for the device we are configuring? */ |
969 | if (b->xid != ic_dev_xid) { | |
970 | if (net_ratelimit()) | |
971 | printk(KERN_ERR "DHCP/BOOTP: Ignoring delayed packet \n"); | |
972 | goto drop_unlock; | |
973 | } | |
974 | ||
1da177e4 LT |
975 | /* Parse extensions */ |
976 | if (ext_len >= 4 && | |
977 | !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */ | |
e905a9ed | 978 | u8 *end = (u8 *) b + ntohs(b->iph.tot_len); |
1da177e4 LT |
979 | u8 *ext; |
980 | ||
981 | #ifdef IPCONFIG_DHCP | |
982 | if (ic_proto_enabled & IC_USE_DHCP) { | |
5a874db4 | 983 | __be32 server_id = NONE; |
1da177e4 LT |
984 | int mt = 0; |
985 | ||
986 | ext = &b->exten[4]; | |
987 | while (ext < end && *ext != 0xff) { | |
988 | u8 *opt = ext++; | |
989 | if (*opt == 0) /* Padding */ | |
990 | continue; | |
991 | ext += *ext + 1; | |
992 | if (ext >= end) | |
993 | break; | |
994 | switch (*opt) { | |
995 | case 53: /* Message type */ | |
996 | if (opt[1]) | |
997 | mt = opt[2]; | |
998 | break; | |
999 | case 54: /* Server ID (IP address) */ | |
1000 | if (opt[1] >= 4) | |
1001 | memcpy(&server_id, opt + 2, 4); | |
1002 | break; | |
3ff50b79 | 1003 | } |
1da177e4 LT |
1004 | } |
1005 | ||
1006 | #ifdef IPCONFIG_DEBUG | |
1007 | printk("DHCP: Got message type %d\n", mt); | |
1008 | #endif | |
1009 | ||
1010 | switch (mt) { | |
1011 | case DHCPOFFER: | |
1012 | /* While in the process of accepting one offer, | |
1013 | * ignore all others. | |
1014 | */ | |
5a874db4 | 1015 | if (ic_myaddr != NONE) |
1da177e4 LT |
1016 | goto drop_unlock; |
1017 | ||
1018 | /* Let's accept that offer. */ | |
1019 | ic_myaddr = b->your_ip; | |
1020 | ic_servaddr = server_id; | |
1021 | #ifdef IPCONFIG_DEBUG | |
673d57e7 HH |
1022 | printk("DHCP: Offered address %pI4 by server %pI4\n", |
1023 | &ic_myaddr, &ic_servaddr); | |
1da177e4 LT |
1024 | #endif |
1025 | /* The DHCP indicated server address takes | |
1026 | * precedence over the bootp header one if | |
1027 | * they are different. | |
1028 | */ | |
5a874db4 | 1029 | if ((server_id != NONE) && |
1da177e4 LT |
1030 | (b->server_ip != server_id)) |
1031 | b->server_ip = ic_servaddr; | |
1032 | break; | |
1033 | ||
1034 | case DHCPACK: | |
1035 | if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0) | |
1036 | goto drop_unlock; | |
1037 | ||
1038 | /* Yeah! */ | |
1039 | break; | |
1040 | ||
1041 | default: | |
1042 | /* Urque. Forget it*/ | |
5a874db4 AV |
1043 | ic_myaddr = NONE; |
1044 | ic_servaddr = NONE; | |
1da177e4 | 1045 | goto drop_unlock; |
3ff50b79 | 1046 | } |
1da177e4 LT |
1047 | |
1048 | ic_dhcp_msgtype = mt; | |
1049 | ||
1050 | } | |
1051 | #endif /* IPCONFIG_DHCP */ | |
1052 | ||
1053 | ext = &b->exten[4]; | |
1054 | while (ext < end && *ext != 0xff) { | |
1055 | u8 *opt = ext++; | |
1056 | if (*opt == 0) /* Padding */ | |
1057 | continue; | |
1058 | ext += *ext + 1; | |
1059 | if (ext < end) | |
1060 | ic_do_bootp_ext(opt); | |
1061 | } | |
1062 | } | |
1063 | ||
1064 | /* We have a winner! */ | |
1065 | ic_dev = dev; | |
1066 | ic_myaddr = b->your_ip; | |
1067 | ic_servaddr = b->server_ip; | |
5a874db4 | 1068 | if (ic_gateway == NONE && b->relay_ip) |
1da177e4 | 1069 | ic_gateway = b->relay_ip; |
5a874db4 | 1070 | if (ic_nameservers[0] == NONE) |
1da177e4 LT |
1071 | ic_nameservers[0] = ic_servaddr; |
1072 | ic_got_reply = IC_BOOTP; | |
1073 | ||
1074 | drop_unlock: | |
1075 | /* Show's over. Nothing to see here. */ | |
1076 | spin_unlock(&ic_recv_lock); | |
1077 | ||
1078 | drop: | |
1079 | /* Throw the packet out. */ | |
1080 | kfree_skb(skb); | |
1081 | ||
1082 | return 0; | |
e905a9ed | 1083 | } |
1da177e4 LT |
1084 | |
1085 | ||
1086 | #endif | |
1087 | ||
1088 | ||
1089 | /* | |
1090 | * Dynamic IP configuration -- DHCP, BOOTP, RARP. | |
1091 | */ | |
1092 | ||
1093 | #ifdef IPCONFIG_DYNAMIC | |
1094 | ||
1095 | static int __init ic_dynamic(void) | |
1096 | { | |
1097 | int retries; | |
1098 | struct ic_device *d; | |
1099 | unsigned long start_jiffies, timeout, jiff; | |
1100 | int do_bootp = ic_proto_have_if & IC_BOOTP; | |
1101 | int do_rarp = ic_proto_have_if & IC_RARP; | |
1102 | ||
1103 | /* | |
1104 | * If none of DHCP/BOOTP/RARP was selected, return with an error. | |
1105 | * This routine gets only called when some pieces of information | |
1106 | * are missing, and without DHCP/BOOTP/RARP we are unable to get it. | |
1107 | */ | |
1108 | if (!ic_proto_enabled) { | |
1109 | printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n"); | |
1110 | return -1; | |
1111 | } | |
1112 | ||
1113 | #ifdef IPCONFIG_BOOTP | |
1114 | if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP) | |
1115 | printk(KERN_ERR "DHCP/BOOTP: No suitable device found.\n"); | |
1116 | #endif | |
1117 | #ifdef IPCONFIG_RARP | |
1118 | if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP) | |
1119 | printk(KERN_ERR "RARP: No suitable device found.\n"); | |
1120 | #endif | |
1121 | ||
1122 | if (!ic_proto_have_if) | |
1123 | /* Error message already printed */ | |
1124 | return -1; | |
1125 | ||
1126 | /* | |
1127 | * Setup protocols | |
1128 | */ | |
1129 | #ifdef IPCONFIG_BOOTP | |
1130 | if (do_bootp) | |
1131 | ic_bootp_init(); | |
1132 | #endif | |
1133 | #ifdef IPCONFIG_RARP | |
1134 | if (do_rarp) | |
1135 | ic_rarp_init(); | |
1136 | #endif | |
1137 | ||
1138 | /* | |
1139 | * Send requests and wait, until we get an answer. This loop | |
1140 | * seems to be a terrible waste of CPU time, but actually there is | |
1141 | * only one process running at all, so we don't need to use any | |
1142 | * scheduler functions. | |
e905a9ed | 1143 | * [Actually we could now, but the nothing else running note still |
1da177e4 LT |
1144 | * applies.. - AC] |
1145 | */ | |
1146 | printk(KERN_NOTICE "Sending %s%s%s requests .", | |
1147 | do_bootp | |
1148 | ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "", | |
1149 | (do_bootp && do_rarp) ? " and " : "", | |
1150 | do_rarp ? "RARP" : ""); | |
1151 | ||
1152 | start_jiffies = jiffies; | |
1153 | d = ic_first_dev; | |
1154 | retries = CONF_SEND_RETRIES; | |
1155 | get_random_bytes(&timeout, sizeof(timeout)); | |
1156 | timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned) CONF_TIMEOUT_RANDOM); | |
132adf54 | 1157 | for (;;) { |
2513dfb8 CF |
1158 | /* Track the device we are configuring */ |
1159 | ic_dev_xid = d->xid; | |
1160 | ||
1da177e4 LT |
1161 | #ifdef IPCONFIG_BOOTP |
1162 | if (do_bootp && (d->able & IC_BOOTP)) | |
1163 | ic_bootp_send_if(d, jiffies - start_jiffies); | |
1164 | #endif | |
1165 | #ifdef IPCONFIG_RARP | |
1166 | if (do_rarp && (d->able & IC_RARP)) | |
1167 | ic_rarp_send_if(d); | |
1168 | #endif | |
1169 | ||
1170 | jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout); | |
121caf57 NA |
1171 | while (time_before(jiffies, jiff) && !ic_got_reply) |
1172 | schedule_timeout_uninterruptible(1); | |
1da177e4 LT |
1173 | #ifdef IPCONFIG_DHCP |
1174 | /* DHCP isn't done until we get a DHCPACK. */ | |
1175 | if ((ic_got_reply & IC_BOOTP) | |
1176 | && (ic_proto_enabled & IC_USE_DHCP) | |
1177 | && ic_dhcp_msgtype != DHCPACK) | |
1178 | { | |
1179 | ic_got_reply = 0; | |
1180 | printk(","); | |
1181 | continue; | |
1182 | } | |
1183 | #endif /* IPCONFIG_DHCP */ | |
1184 | ||
1185 | if (ic_got_reply) { | |
1186 | printk(" OK\n"); | |
1187 | break; | |
1188 | } | |
1189 | ||
1190 | if ((d = d->next)) | |
1191 | continue; | |
1192 | ||
1193 | if (! --retries) { | |
1194 | printk(" timed out!\n"); | |
1195 | break; | |
1196 | } | |
1197 | ||
1198 | d = ic_first_dev; | |
1199 | ||
1200 | timeout = timeout CONF_TIMEOUT_MULT; | |
1201 | if (timeout > CONF_TIMEOUT_MAX) | |
1202 | timeout = CONF_TIMEOUT_MAX; | |
1203 | ||
1204 | printk("."); | |
1205 | } | |
1206 | ||
1207 | #ifdef IPCONFIG_BOOTP | |
1208 | if (do_bootp) | |
1209 | ic_bootp_cleanup(); | |
1210 | #endif | |
1211 | #ifdef IPCONFIG_RARP | |
1212 | if (do_rarp) | |
1213 | ic_rarp_cleanup(); | |
1214 | #endif | |
1215 | ||
7a1af5d7 | 1216 | if (!ic_got_reply) { |
5a874db4 | 1217 | ic_myaddr = NONE; |
1da177e4 | 1218 | return -1; |
7a1af5d7 | 1219 | } |
1da177e4 | 1220 | |
673d57e7 | 1221 | printk("IP-Config: Got %s answer from %pI4, ", |
e905a9ed | 1222 | ((ic_got_reply & IC_RARP) ? "RARP" |
1da177e4 | 1223 | : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"), |
673d57e7 HH |
1224 | &ic_servaddr); |
1225 | printk("my address is %pI4\n", &ic_myaddr); | |
1da177e4 LT |
1226 | |
1227 | return 0; | |
1228 | } | |
1229 | ||
1230 | #endif /* IPCONFIG_DYNAMIC */ | |
1231 | ||
1232 | #ifdef CONFIG_PROC_FS | |
1233 | ||
1234 | static int pnp_seq_show(struct seq_file *seq, void *v) | |
1235 | { | |
1236 | int i; | |
1237 | ||
1238 | if (ic_proto_used & IC_PROTO) | |
1239 | seq_printf(seq, "#PROTO: %s\n", | |
1240 | (ic_proto_used & IC_RARP) ? "RARP" | |
1241 | : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP"); | |
1242 | else | |
1243 | seq_puts(seq, "#MANUAL\n"); | |
1244 | ||
1245 | if (ic_domain[0]) | |
1246 | seq_printf(seq, | |
1247 | "domain %s\n", ic_domain); | |
1248 | for (i = 0; i < CONF_NAMESERVERS_MAX; i++) { | |
5a874db4 | 1249 | if (ic_nameservers[i] != NONE) |
673d57e7 HH |
1250 | seq_printf(seq, "nameserver %pI4\n", |
1251 | &ic_nameservers[i]); | |
1da177e4 | 1252 | } |
5a874db4 | 1253 | if (ic_servaddr != NONE) |
673d57e7 HH |
1254 | seq_printf(seq, "bootserver %pI4\n", |
1255 | &ic_servaddr); | |
1da177e4 LT |
1256 | return 0; |
1257 | } | |
1258 | ||
1259 | static int pnp_seq_open(struct inode *indoe, struct file *file) | |
1260 | { | |
1261 | return single_open(file, pnp_seq_show, NULL); | |
1262 | } | |
1263 | ||
9a32144e | 1264 | static const struct file_operations pnp_seq_fops = { |
1da177e4 LT |
1265 | .owner = THIS_MODULE, |
1266 | .open = pnp_seq_open, | |
1267 | .read = seq_read, | |
1268 | .llseek = seq_lseek, | |
1269 | .release = single_release, | |
1270 | }; | |
1271 | #endif /* CONFIG_PROC_FS */ | |
1272 | ||
1273 | /* | |
1274 | * Extract IP address from the parameter string if needed. Note that we | |
1275 | * need to have root_server_addr set _before_ IPConfig gets called as it | |
1276 | * can override it. | |
1277 | */ | |
5a874db4 | 1278 | __be32 __init root_nfs_parse_addr(char *name) |
1da177e4 | 1279 | { |
5a874db4 | 1280 | __be32 addr; |
1da177e4 LT |
1281 | int octets = 0; |
1282 | char *cp, *cq; | |
1283 | ||
1284 | cp = cq = name; | |
1285 | while (octets < 4) { | |
1286 | while (*cp >= '0' && *cp <= '9') | |
1287 | cp++; | |
1288 | if (cp == cq || cp - cq > 3) | |
1289 | break; | |
1290 | if (*cp == '.' || octets == 3) | |
1291 | octets++; | |
1292 | if (octets < 4) | |
1293 | cp++; | |
1294 | cq = cp; | |
1295 | } | |
1296 | if (octets == 4 && (*cp == ':' || *cp == '\0')) { | |
1297 | if (*cp == ':') | |
1298 | *cp++ = '\0'; | |
1299 | addr = in_aton(name); | |
1300 | memmove(name, cp, strlen(cp) + 1); | |
1301 | } else | |
5a874db4 | 1302 | addr = NONE; |
1da177e4 LT |
1303 | |
1304 | return addr; | |
1305 | } | |
1306 | ||
1307 | /* | |
1308 | * IP Autoconfig dispatcher. | |
1309 | */ | |
1310 | ||
1311 | static int __init ip_auto_config(void) | |
1312 | { | |
5a874db4 | 1313 | __be32 addr; |
9d8dba6c BZ |
1314 | #ifdef IPCONFIG_DYNAMIC |
1315 | int retries = CONF_OPEN_RETRIES; | |
1316 | #endif | |
1da177e4 LT |
1317 | |
1318 | #ifdef CONFIG_PROC_FS | |
457c4cbc | 1319 | proc_net_fops_create(&init_net, "pnp", S_IRUGO, &pnp_seq_fops); |
1da177e4 LT |
1320 | #endif /* CONFIG_PROC_FS */ |
1321 | ||
1322 | if (!ic_enable) | |
1323 | return 0; | |
1324 | ||
1325 | DBG(("IP-Config: Entered.\n")); | |
1326 | #ifdef IPCONFIG_DYNAMIC | |
1327 | try_try_again: | |
1328 | #endif | |
1329 | /* Give hardware a chance to settle */ | |
1330 | msleep(CONF_PRE_OPEN); | |
1331 | ||
1332 | /* Setup all network devices */ | |
1333 | if (ic_open_devs() < 0) | |
1334 | return -1; | |
1335 | ||
1336 | /* Give drivers a chance to settle */ | |
1337 | ssleep(CONF_POST_OPEN); | |
1338 | ||
1339 | /* | |
1340 | * If the config information is insufficient (e.g., our IP address or | |
1341 | * IP address of the boot server is missing or we have multiple network | |
1342 | * interfaces and no default was set), use BOOTP or RARP to get the | |
1343 | * missing values. | |
1344 | */ | |
5a874db4 | 1345 | if (ic_myaddr == NONE || |
1da177e4 | 1346 | #ifdef CONFIG_ROOT_NFS |
dcbdc93c JT |
1347 | (root_server_addr == NONE |
1348 | && ic_servaddr == NONE | |
1349 | && ROOT_DEV == Root_NFS) || | |
1da177e4 LT |
1350 | #endif |
1351 | ic_first_dev->next) { | |
1352 | #ifdef IPCONFIG_DYNAMIC | |
1da177e4 LT |
1353 | if (ic_dynamic() < 0) { |
1354 | ic_close_devs(); | |
1355 | ||
1356 | /* | |
1357 | * I don't know why, but sometimes the | |
1358 | * eepro100 driver (at least) gets upset and | |
1359 | * doesn't work the first time it's opened. | |
1360 | * But then if you close it and reopen it, it | |
1361 | * works just fine. So we need to try that at | |
1362 | * least once before giving up. | |
1363 | * | |
1364 | * Also, if the root will be NFS-mounted, we | |
1365 | * have nowhere to go if DHCP fails. So we | |
1366 | * just have to keep trying forever. | |
1367 | * | |
1368 | * -- Chip | |
1369 | */ | |
1370 | #ifdef CONFIG_ROOT_NFS | |
1371 | if (ROOT_DEV == Root_NFS) { | |
e905a9ed | 1372 | printk(KERN_ERR |
1da177e4 LT |
1373 | "IP-Config: Retrying forever (NFS root)...\n"); |
1374 | goto try_try_again; | |
1375 | } | |
1376 | #endif | |
1377 | ||
1378 | if (--retries) { | |
e905a9ed | 1379 | printk(KERN_ERR |
1da177e4 LT |
1380 | "IP-Config: Reopening network devices...\n"); |
1381 | goto try_try_again; | |
1382 | } | |
1383 | ||
1384 | /* Oh, well. At least we tried. */ | |
1385 | printk(KERN_ERR "IP-Config: Auto-configuration of network failed.\n"); | |
1386 | return -1; | |
1387 | } | |
1388 | #else /* !DYNAMIC */ | |
1389 | printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n"); | |
1390 | ic_close_devs(); | |
1391 | return -1; | |
1392 | #endif /* IPCONFIG_DYNAMIC */ | |
1393 | } else { | |
1394 | /* Device selected manually or only one device -> use it */ | |
1395 | ic_dev = ic_first_dev->dev; | |
1396 | } | |
1397 | ||
1398 | addr = root_nfs_parse_addr(root_server_path); | |
5a874db4 | 1399 | if (root_server_addr == NONE) |
1da177e4 LT |
1400 | root_server_addr = addr; |
1401 | ||
1402 | /* | |
1403 | * Use defaults whereever applicable. | |
1404 | */ | |
1405 | if (ic_defaults() < 0) | |
1406 | return -1; | |
1407 | ||
1408 | /* | |
1409 | * Close all network devices except the device we've | |
1410 | * autoconfigured and set up routes. | |
1411 | */ | |
1412 | ic_close_devs(); | |
1413 | if (ic_setup_if() < 0 || ic_setup_routes() < 0) | |
1414 | return -1; | |
1415 | ||
1416 | /* | |
1417 | * Record which protocol was actually used. | |
1418 | */ | |
1419 | #ifdef IPCONFIG_DYNAMIC | |
1420 | ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP); | |
1421 | #endif | |
1422 | ||
1423 | #ifndef IPCONFIG_SILENT | |
1424 | /* | |
1425 | * Clue in the operator. | |
1426 | */ | |
1427 | printk("IP-Config: Complete:"); | |
9c00409a | 1428 | printk("\n device=%s", ic_dev->name); |
673d57e7 HH |
1429 | printk(", addr=%pI4", &ic_myaddr); |
1430 | printk(", mask=%pI4", &ic_netmask); | |
1431 | printk(", gw=%pI4", &ic_gateway); | |
1da177e4 | 1432 | printk(",\n host=%s, domain=%s, nis-domain=%s", |
e9ff3990 | 1433 | utsname()->nodename, ic_domain, utsname()->domainname); |
673d57e7 HH |
1434 | printk(",\n bootserver=%pI4", &ic_servaddr); |
1435 | printk(", rootserver=%pI4", &root_server_addr); | |
1da177e4 | 1436 | printk(", rootpath=%s", root_server_path); |
9643f455 CF |
1437 | if (ic_dev_mtu) |
1438 | printk(", mtu=%d", ic_dev_mtu); | |
1da177e4 LT |
1439 | printk("\n"); |
1440 | #endif /* !SILENT */ | |
1441 | ||
1442 | return 0; | |
1443 | } | |
1444 | ||
1445 | late_initcall(ip_auto_config); | |
1446 | ||
1447 | ||
1448 | /* | |
1449 | * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel | |
6ded55da | 1450 | * command line parameter. See Documentation/filesystems/nfsroot.txt. |
1da177e4 LT |
1451 | */ |
1452 | static int __init ic_proto_name(char *name) | |
1453 | { | |
1454 | if (!strcmp(name, "on") || !strcmp(name, "any")) { | |
1455 | return 1; | |
1456 | } | |
a6c05c3d | 1457 | if (!strcmp(name, "off") || !strcmp(name, "none")) { |
92ffb85d | 1458 | return 0; |
a6c05c3d | 1459 | } |
1da177e4 LT |
1460 | #ifdef CONFIG_IP_PNP_DHCP |
1461 | else if (!strcmp(name, "dhcp")) { | |
1462 | ic_proto_enabled &= ~IC_RARP; | |
1463 | return 1; | |
1464 | } | |
1465 | #endif | |
1466 | #ifdef CONFIG_IP_PNP_BOOTP | |
1467 | else if (!strcmp(name, "bootp")) { | |
1468 | ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP); | |
1469 | return 1; | |
1470 | } | |
1471 | #endif | |
1472 | #ifdef CONFIG_IP_PNP_RARP | |
1473 | else if (!strcmp(name, "rarp")) { | |
1474 | ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP); | |
1475 | return 1; | |
1476 | } | |
1477 | #endif | |
1478 | #ifdef IPCONFIG_DYNAMIC | |
1479 | else if (!strcmp(name, "both")) { | |
1480 | ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */ | |
1481 | return 1; | |
1482 | } | |
1483 | #endif | |
1484 | return 0; | |
1485 | } | |
1486 | ||
1487 | static int __init ip_auto_config_setup(char *addrs) | |
1488 | { | |
1489 | char *cp, *ip, *dp; | |
1490 | int num = 0; | |
1491 | ||
1492 | ic_set_manually = 1; | |
9cecd07c | 1493 | ic_enable = 1; |
1da177e4 | 1494 | |
92ffb85d AW |
1495 | /* |
1496 | * If any dhcp, bootp etc options are set, leave autoconfig on | |
1497 | * and skip the below static IP processing. | |
1498 | */ | |
1da177e4 LT |
1499 | if (ic_proto_name(addrs)) |
1500 | return 1; | |
1501 | ||
92ffb85d AW |
1502 | /* If no static IP is given, turn off autoconfig and bail. */ |
1503 | if (*addrs == 0 || | |
1504 | strcmp(addrs, "off") == 0 || | |
1505 | strcmp(addrs, "none") == 0) { | |
1506 | ic_enable = 0; | |
1507 | return 1; | |
1508 | } | |
1509 | ||
1510 | /* Parse string for static IP assignment. */ | |
1da177e4 LT |
1511 | ip = addrs; |
1512 | while (ip && *ip) { | |
1513 | if ((cp = strchr(ip, ':'))) | |
1514 | *cp++ = '\0'; | |
1515 | if (strlen(ip) > 0) { | |
1516 | DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip)); | |
1517 | switch (num) { | |
1518 | case 0: | |
e6f1cebf | 1519 | if ((ic_myaddr = in_aton(ip)) == ANY) |
5a874db4 | 1520 | ic_myaddr = NONE; |
1da177e4 LT |
1521 | break; |
1522 | case 1: | |
e6f1cebf | 1523 | if ((ic_servaddr = in_aton(ip)) == ANY) |
5a874db4 | 1524 | ic_servaddr = NONE; |
1da177e4 LT |
1525 | break; |
1526 | case 2: | |
e6f1cebf | 1527 | if ((ic_gateway = in_aton(ip)) == ANY) |
5a874db4 | 1528 | ic_gateway = NONE; |
1da177e4 LT |
1529 | break; |
1530 | case 3: | |
e6f1cebf | 1531 | if ((ic_netmask = in_aton(ip)) == ANY) |
5a874db4 | 1532 | ic_netmask = NONE; |
1da177e4 LT |
1533 | break; |
1534 | case 4: | |
1535 | if ((dp = strchr(ip, '.'))) { | |
1536 | *dp++ = '\0'; | |
e9ff3990 SH |
1537 | strlcpy(utsname()->domainname, dp, |
1538 | sizeof(utsname()->domainname)); | |
1da177e4 | 1539 | } |
e9ff3990 SH |
1540 | strlcpy(utsname()->nodename, ip, |
1541 | sizeof(utsname()->nodename)); | |
1da177e4 LT |
1542 | ic_host_name_set = 1; |
1543 | break; | |
1544 | case 5: | |
1545 | strlcpy(user_dev_name, ip, sizeof(user_dev_name)); | |
1546 | break; | |
1547 | case 6: | |
92ffb85d AW |
1548 | if (ic_proto_name(ip) == 0 && |
1549 | ic_myaddr == NONE) { | |
1550 | ic_enable = 0; | |
1551 | } | |
1da177e4 LT |
1552 | break; |
1553 | } | |
1554 | } | |
1555 | ip = cp; | |
1556 | num++; | |
1557 | } | |
1558 | ||
1559 | return 1; | |
1560 | } | |
1561 | ||
1562 | static int __init nfsaddrs_config_setup(char *addrs) | |
1563 | { | |
1564 | return ip_auto_config_setup(addrs); | |
1565 | } | |
1566 | ||
62013dbb RJ |
1567 | static int __init vendor_class_identifier_setup(char *addrs) |
1568 | { | |
1569 | if (strlcpy(vendor_class_identifier, addrs, | |
1570 | sizeof(vendor_class_identifier)) | |
1571 | >= sizeof(vendor_class_identifier)) | |
1572 | printk(KERN_WARNING "DHCP: vendorclass too long, truncated to \"%s\"", | |
1573 | vendor_class_identifier); | |
1574 | return 1; | |
1575 | } | |
1576 | ||
1da177e4 LT |
1577 | __setup("ip=", ip_auto_config_setup); |
1578 | __setup("nfsaddrs=", nfsaddrs_config_setup); | |
62013dbb | 1579 | __setup("dhcpclass=", vendor_class_identifier_setup); |