2 * $Id: ipconfig.c,v 1.46 2002/02/01 22:01:04 davem Exp $
4 * Automatic Configuration of IP -- use DHCP, BOOTP, RARP, or
5 * user-supplied information to configure own IP address and routes.
7 * Copyright (C) 1996-1998 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
9 * Derived from network configuration code in fs/nfs/nfsroot.c,
10 * originally Copyright (C) 1995, 1996 Gero Kuhlmann and me.
12 * BOOTP rewritten to construct and analyse packets itself instead
13 * of misusing the IP layer. num_bugs_causing_wrong_arp_replies--;
14 * -- MJ, December 1998
16 * Fixed ip_auto_config_setup calling at startup in the new "Linker Magic"
17 * initialization scheme.
18 * - Arnaldo Carvalho de Melo <acme@conectiva.com.br>, 08/11/1999
20 * DHCP support added. To users this looks like a whole separate
21 * protocol, but we know it's just a bag on the side of BOOTP.
22 * -- Chip Salzenberg <chip@valinux.com>, May 2000
24 * Ported DHCP support from 2.2.16 to 2.4.0-test4
25 * -- Eric Biederman <ebiederman@lnxi.com>, 30 Aug 2000
27 * Merged changes from 2.2.19 into 2.4.3
28 * -- Eric Biederman <ebiederman@lnxi.com>, 22 April Aug 2001
30 * Multiple Nameservers in /proc/net/pnp
31 * -- Josef Siemes <jsiemes@web.de>, Aug 2002
34 #include <linux/types.h>
35 #include <linux/string.h>
36 #include <linux/kernel.h>
37 #include <linux/jiffies.h>
38 #include <linux/random.h>
39 #include <linux/init.h>
40 #include <linux/utsname.h>
43 #include <linux/inet.h>
44 #include <linux/inetdevice.h>
45 #include <linux/netdevice.h>
46 #include <linux/if_arp.h>
47 #include <linux/skbuff.h>
49 #include <linux/socket.h>
50 #include <linux/route.h>
51 #include <linux/udp.h>
52 #include <linux/proc_fs.h>
53 #include <linux/seq_file.h>
54 #include <linux/major.h>
55 #include <linux/root_dev.h>
56 #include <linux/delay.h>
57 #include <linux/nfs_fs.h>
58 #include <net/net_namespace.h>
61 #include <net/ipconfig.h>
62 #include <net/route.h>
64 #include <asm/uaccess.h>
65 #include <net/checksum.h>
66 #include <asm/processor.h>
68 /* Define this to allow debugging output */
72 #define DBG(x) printk x
74 #define DBG(x) do { } while(0)
77 #if defined(CONFIG_IP_PNP_DHCP)
80 #if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_DHCP)
81 #define IPCONFIG_BOOTP
83 #if defined(CONFIG_IP_PNP_RARP)
86 #if defined(IPCONFIG_BOOTP) || defined(IPCONFIG_RARP)
87 #define IPCONFIG_DYNAMIC
90 /* Define the friendly delay before and after opening net devices */
91 #define CONF_PRE_OPEN 500 /* Before opening: 1/2 second */
92 #define CONF_POST_OPEN 1 /* After opening: 1 second */
94 /* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */
95 #define CONF_OPEN_RETRIES 2 /* (Re)open devices twice */
96 #define CONF_SEND_RETRIES 6 /* Send six requests per open */
97 #define CONF_INTER_TIMEOUT (HZ/2) /* Inter-device timeout: 1/2 second */
98 #define CONF_BASE_TIMEOUT (HZ*2) /* Initial timeout: 2 seconds */
99 #define CONF_TIMEOUT_RANDOM (HZ) /* Maximum amount of randomization */
100 #define CONF_TIMEOUT_MULT *7/4 /* Rate of timeout growth */
101 #define CONF_TIMEOUT_MAX (HZ*30) /* Maximum allowed timeout */
102 #define CONF_NAMESERVERS_MAX 3 /* Maximum number of nameservers
103 - '3' from resolv.h */
105 #define NONE __constant_htonl(INADDR_NONE)
108 * Public IP configuration
111 /* This is used by platforms which might be able to set the ipconfig
112 * variables using firmware environment vars. If this is set, it will
113 * ignore such firmware variables.
115 int ic_set_manually __initdata
= 0; /* IPconfig parameters set manually */
117 static int ic_enable __initdata
= 0; /* IP config enabled? */
119 /* Protocol choice */
120 int ic_proto_enabled __initdata
= 0
121 #ifdef IPCONFIG_BOOTP
124 #ifdef CONFIG_IP_PNP_DHCP
132 static int ic_host_name_set __initdata
= 0; /* Host name set by us? */
134 __be32 ic_myaddr
= NONE
; /* My IP address */
135 static __be32 ic_netmask
= NONE
; /* Netmask for local subnet */
136 __be32 ic_gateway
= NONE
; /* Gateway IP address */
138 __be32 ic_servaddr
= NONE
; /* Boot server IP address */
140 __be32 root_server_addr
= NONE
; /* Address of NFS server */
141 u8 root_server_path
[256] = { 0, }; /* Path to mount as root */
143 /* Persistent data: */
145 static int ic_proto_used
; /* Protocol used, if any */
146 static __be32 ic_nameservers
[CONF_NAMESERVERS_MAX
]; /* DNS Server IP addresses */
147 static u8 ic_domain
[64]; /* DNS (not NIS) domain name */
153 /* Name of user-selected boot device */
154 static char user_dev_name
[IFNAMSIZ
] __initdata
= { 0, };
156 /* Protocols supported by available interfaces */
157 static int ic_proto_have_if __initdata
= 0;
159 #ifdef IPCONFIG_DYNAMIC
160 static DEFINE_SPINLOCK(ic_recv_lock
);
161 static volatile int ic_got_reply __initdata
= 0; /* Proto(s) that replied */
164 static int ic_dhcp_msgtype __initdata
= 0; /* DHCP msg type received */
173 struct ic_device
*next
;
174 struct net_device
*dev
;
175 unsigned short flags
;
180 static struct ic_device
*ic_first_dev __initdata
= NULL
;/* List of open device */
181 static struct net_device
*ic_dev __initdata
= NULL
; /* Selected device */
183 static int __init
ic_open_devs(void)
185 struct ic_device
*d
, **last
;
186 struct net_device
*dev
;
187 unsigned short oflags
;
189 last
= &ic_first_dev
;
192 /* bring loopback device up first */
193 if (dev_change_flags(&loopback_dev
, loopback_dev
.flags
| IFF_UP
) < 0)
194 printk(KERN_ERR
"IP-Config: Failed to open %s\n", loopback_dev
.name
);
196 for_each_netdev(dev
) {
197 if (dev
== &loopback_dev
)
199 if (user_dev_name
[0] ? !strcmp(dev
->name
, user_dev_name
) :
200 (!(dev
->flags
& IFF_LOOPBACK
) &&
201 (dev
->flags
& (IFF_POINTOPOINT
|IFF_BROADCAST
)) &&
202 strncmp(dev
->name
, "dummy", 5))) {
207 printk(KERN_WARNING
"DHCP/BOOTP: Ignoring device %s, MTU %d too small", dev
->name
, dev
->mtu
);
208 if (!(dev
->flags
& IFF_NOARP
))
210 able
&= ic_proto_enabled
;
211 if (ic_proto_enabled
&& !able
)
214 if (dev_change_flags(dev
, oflags
| IFF_UP
) < 0) {
215 printk(KERN_ERR
"IP-Config: Failed to open %s\n", dev
->name
);
218 if (!(d
= kmalloc(sizeof(struct ic_device
), GFP_KERNEL
))) {
228 get_random_bytes(&d
->xid
, sizeof(__be32
));
231 ic_proto_have_if
|= able
;
232 DBG(("IP-Config: %s UP (able=%d, xid=%08x)\n",
233 dev
->name
, able
, d
->xid
));
241 if (user_dev_name
[0])
242 printk(KERN_ERR
"IP-Config: Device `%s' not found.\n", user_dev_name
);
244 printk(KERN_ERR
"IP-Config: No network devices available.\n");
250 static void __init
ic_close_devs(void)
252 struct ic_device
*d
, *next
;
253 struct net_device
*dev
;
261 DBG(("IP-Config: Downing %s\n", dev
->name
));
262 dev_change_flags(dev
, d
->flags
);
270 * Interface to various network functions.
274 set_sockaddr(struct sockaddr_in
*sin
, __be32 addr
, __be16 port
)
276 sin
->sin_family
= AF_INET
;
277 sin
->sin_addr
.s_addr
= addr
;
278 sin
->sin_port
= port
;
281 static int __init
ic_dev_ioctl(unsigned int cmd
, struct ifreq
*arg
)
285 mm_segment_t oldfs
= get_fs();
287 res
= devinet_ioctl(cmd
, (struct ifreq __user
*) arg
);
292 static int __init
ic_route_ioctl(unsigned int cmd
, struct rtentry
*arg
)
296 mm_segment_t oldfs
= get_fs();
298 res
= ip_rt_ioctl(cmd
, (void __user
*) arg
);
304 * Set up interface addresses and routes.
307 static int __init
ic_setup_if(void)
310 struct sockaddr_in
*sin
= (void *) &ir
.ifr_ifru
.ifru_addr
;
313 memset(&ir
, 0, sizeof(ir
));
314 strcpy(ir
.ifr_ifrn
.ifrn_name
, ic_dev
->name
);
315 set_sockaddr(sin
, ic_myaddr
, 0);
316 if ((err
= ic_dev_ioctl(SIOCSIFADDR
, &ir
)) < 0) {
317 printk(KERN_ERR
"IP-Config: Unable to set interface address (%d).\n", err
);
320 set_sockaddr(sin
, ic_netmask
, 0);
321 if ((err
= ic_dev_ioctl(SIOCSIFNETMASK
, &ir
)) < 0) {
322 printk(KERN_ERR
"IP-Config: Unable to set interface netmask (%d).\n", err
);
325 set_sockaddr(sin
, ic_myaddr
| ~ic_netmask
, 0);
326 if ((err
= ic_dev_ioctl(SIOCSIFBRDADDR
, &ir
)) < 0) {
327 printk(KERN_ERR
"IP-Config: Unable to set interface broadcast address (%d).\n", err
);
333 static int __init
ic_setup_routes(void)
335 /* No need to setup device routes, only the default route... */
337 if (ic_gateway
!= NONE
) {
341 memset(&rm
, 0, sizeof(rm
));
342 if ((ic_gateway
^ ic_myaddr
) & ic_netmask
) {
343 printk(KERN_ERR
"IP-Config: Gateway not on directly connected network.\n");
346 set_sockaddr((struct sockaddr_in
*) &rm
.rt_dst
, 0, 0);
347 set_sockaddr((struct sockaddr_in
*) &rm
.rt_genmask
, 0, 0);
348 set_sockaddr((struct sockaddr_in
*) &rm
.rt_gateway
, ic_gateway
, 0);
349 rm
.rt_flags
= RTF_UP
| RTF_GATEWAY
;
350 if ((err
= ic_route_ioctl(SIOCADDRT
, &rm
)) < 0) {
351 printk(KERN_ERR
"IP-Config: Cannot add default route (%d).\n", err
);
360 * Fill in default values for all missing parameters.
363 static int __init
ic_defaults(void)
366 * At this point we have no userspace running so need not
367 * claim locks on system_utsname
370 if (!ic_host_name_set
)
371 sprintf(init_utsname()->nodename
, "%u.%u.%u.%u", NIPQUAD(ic_myaddr
));
373 if (root_server_addr
== NONE
)
374 root_server_addr
= ic_servaddr
;
376 if (ic_netmask
== NONE
) {
377 if (IN_CLASSA(ntohl(ic_myaddr
)))
378 ic_netmask
= htonl(IN_CLASSA_NET
);
379 else if (IN_CLASSB(ntohl(ic_myaddr
)))
380 ic_netmask
= htonl(IN_CLASSB_NET
);
381 else if (IN_CLASSC(ntohl(ic_myaddr
)))
382 ic_netmask
= htonl(IN_CLASSC_NET
);
384 printk(KERN_ERR
"IP-Config: Unable to guess netmask for address %u.%u.%u.%u\n",
388 printk("IP-Config: Guessing netmask %u.%u.%u.%u\n", NIPQUAD(ic_netmask
));
400 static int ic_rarp_recv(struct sk_buff
*skb
, struct net_device
*dev
, struct packet_type
*pt
, struct net_device
*orig_dev
);
402 static struct packet_type rarp_packet_type __initdata
= {
403 .type
= __constant_htons(ETH_P_RARP
),
404 .func
= ic_rarp_recv
,
407 static inline void ic_rarp_init(void)
409 dev_add_pack(&rarp_packet_type
);
412 static inline void ic_rarp_cleanup(void)
414 dev_remove_pack(&rarp_packet_type
);
418 * Process received RARP packet.
421 ic_rarp_recv(struct sk_buff
*skb
, struct net_device
*dev
, struct packet_type
*pt
, struct net_device
*orig_dev
)
424 unsigned char *rarp_ptr
;
426 unsigned char *sha
, *tha
; /* s for "source", t for "target" */
429 if ((skb
= skb_share_check(skb
, GFP_ATOMIC
)) == NULL
)
432 if (!pskb_may_pull(skb
, sizeof(struct arphdr
)))
435 /* Basic sanity checks can be done without the lock. */
436 rarp
= (struct arphdr
*)skb_transport_header(skb
);
438 /* If this test doesn't pass, it's not IP, or we should
441 if (rarp
->ar_hln
!= dev
->addr_len
|| dev
->type
!= ntohs(rarp
->ar_hrd
))
444 /* If it's not a RARP reply, delete it. */
445 if (rarp
->ar_op
!= htons(ARPOP_RREPLY
))
448 /* If it's not Ethernet, delete it. */
449 if (rarp
->ar_pro
!= htons(ETH_P_IP
))
452 if (!pskb_may_pull(skb
,
453 sizeof(struct arphdr
) +
454 (2 * dev
->addr_len
) +
458 /* OK, it is all there and looks valid, process... */
459 rarp
= (struct arphdr
*)skb_transport_header(skb
);
460 rarp_ptr
= (unsigned char *) (rarp
+ 1);
462 /* One reply at a time, please. */
463 spin_lock(&ic_recv_lock
);
465 /* If we already have a reply, just drop the packet */
469 /* Find the ic_device that the packet arrived on */
471 while (d
&& d
->dev
!= dev
)
474 goto drop_unlock
; /* should never happen */
476 /* Extract variable-width fields */
478 rarp_ptr
+= dev
->addr_len
;
479 memcpy(&sip
, rarp_ptr
, 4);
482 rarp_ptr
+= dev
->addr_len
;
483 memcpy(&tip
, rarp_ptr
, 4);
485 /* Discard packets which are not meant for us. */
486 if (memcmp(tha
, dev
->dev_addr
, dev
->addr_len
))
489 /* Discard packets which are not from specified server. */
490 if (ic_servaddr
!= NONE
&& ic_servaddr
!= sip
)
493 /* We have a winner! */
495 if (ic_myaddr
== NONE
)
498 ic_got_reply
= IC_RARP
;
501 /* Show's over. Nothing to see here. */
502 spin_unlock(&ic_recv_lock
);
505 /* Throw the packet out. */
512 * Send RARP request packet over a single interface.
514 static void __init
ic_rarp_send_if(struct ic_device
*d
)
516 struct net_device
*dev
= d
->dev
;
517 arp_send(ARPOP_RREQUEST
, ETH_P_RARP
, 0, dev
, 0, NULL
,
518 dev
->dev_addr
, dev
->dev_addr
);
523 * DHCP/BOOTP support.
526 #ifdef IPCONFIG_BOOTP
528 struct bootp_pkt
{ /* BOOTP packet format */
529 struct iphdr iph
; /* IP header */
530 struct udphdr udph
; /* UDP header */
531 u8 op
; /* 1=request, 2=reply */
532 u8 htype
; /* HW address type */
533 u8 hlen
; /* HW address length */
534 u8 hops
; /* Used only by gateways */
535 __be32 xid
; /* Transaction ID */
536 __be16 secs
; /* Seconds since we started */
537 __be16 flags
; /* Just what it says */
538 __be32 client_ip
; /* Client's IP address if known */
539 __be32 your_ip
; /* Assigned IP address */
540 __be32 server_ip
; /* (Next, e.g. NFS) Server's IP address */
541 __be32 relay_ip
; /* IP address of BOOTP relay */
542 u8 hw_addr
[16]; /* Client's HW address */
543 u8 serv_name
[64]; /* Server host name */
544 u8 boot_file
[128]; /* Name of boot file */
545 u8 exten
[312]; /* DHCP options / BOOTP vendor extensions */
549 #define BOOTP_REQUEST 1
550 #define BOOTP_REPLY 2
552 /* DHCP message types */
553 #define DHCPDISCOVER 1
555 #define DHCPREQUEST 3
556 #define DHCPDECLINE 4
559 #define DHCPRELEASE 7
562 static int ic_bootp_recv(struct sk_buff
*skb
, struct net_device
*dev
, struct packet_type
*pt
, struct net_device
*orig_dev
);
564 static struct packet_type bootp_packet_type __initdata
= {
565 .type
= __constant_htons(ETH_P_IP
),
566 .func
= ic_bootp_recv
,
571 * Initialize DHCP/BOOTP extension fields in the request.
574 static const u8 ic_bootp_cookie
[4] = { 99, 130, 83, 99 };
579 ic_dhcp_init_options(u8
*options
)
581 u8 mt
= ((ic_servaddr
== NONE
)
582 ? DHCPDISCOVER
: DHCPREQUEST
);
585 #ifdef IPCONFIG_DEBUG
586 printk("DHCP: Sending message type %d\n", mt
);
589 memcpy(e
, ic_bootp_cookie
, 4); /* RFC1048 Magic Cookie */
592 *e
++ = 53; /* DHCP message type */
596 if (mt
== DHCPREQUEST
) {
597 *e
++ = 54; /* Server ID (IP address) */
599 memcpy(e
, &ic_servaddr
, 4);
602 *e
++ = 50; /* Requested IP address */
604 memcpy(e
, &ic_myaddr
, 4);
610 static const u8 ic_req_params
[] = {
612 3, /* Default gateway */
615 15, /* Domain name */
617 40, /* NIS domain name */
620 *e
++ = 55; /* Parameter request list */
621 *e
++ = sizeof(ic_req_params
);
622 memcpy(e
, ic_req_params
, sizeof(ic_req_params
));
623 e
+= sizeof(ic_req_params
);
626 *e
++ = 255; /* End of the list */
629 #endif /* IPCONFIG_DHCP */
631 static void __init
ic_bootp_init_ext(u8
*e
)
633 memcpy(e
, ic_bootp_cookie
, 4); /* RFC1048 Magic Cookie */
635 *e
++ = 1; /* Subnet mask request */
638 *e
++ = 3; /* Default gateway request */
641 *e
++ = 5; /* Name server request */
644 *e
++ = 12; /* Host name request */
647 *e
++ = 40; /* NIS Domain name request */
650 *e
++ = 17; /* Boot path */
654 *e
++ = 57; /* set extension buffer size for reply */
656 *e
++ = 1; /* 128+236+8+20+14, see dhcpd sources */
659 *e
++ = 255; /* End of the list */
664 * Initialize the DHCP/BOOTP mechanism.
666 static inline void ic_bootp_init(void)
670 for (i
= 0; i
< CONF_NAMESERVERS_MAX
; i
++)
671 ic_nameservers
[i
] = NONE
;
673 dev_add_pack(&bootp_packet_type
);
678 * DHCP/BOOTP cleanup.
680 static inline void ic_bootp_cleanup(void)
682 dev_remove_pack(&bootp_packet_type
);
687 * Send DHCP/BOOTP request to single interface.
689 static void __init
ic_bootp_send_if(struct ic_device
*d
, unsigned long jiffies_diff
)
691 struct net_device
*dev
= d
->dev
;
694 int hh_len
= LL_RESERVED_SPACE(dev
);
697 /* Allocate packet */
698 skb
= alloc_skb(sizeof(struct bootp_pkt
) + hh_len
+ 15, GFP_KERNEL
);
701 skb_reserve(skb
, hh_len
);
702 b
= (struct bootp_pkt
*) skb_put(skb
, sizeof(struct bootp_pkt
));
703 memset(b
, 0, sizeof(struct bootp_pkt
));
705 /* Construct IP header */
706 skb_reset_network_header(skb
);
710 h
->tot_len
= htons(sizeof(struct bootp_pkt
));
711 h
->frag_off
= htons(IP_DF
);
713 h
->protocol
= IPPROTO_UDP
;
714 h
->daddr
= htonl(INADDR_BROADCAST
);
715 h
->check
= ip_fast_csum((unsigned char *) h
, h
->ihl
);
717 /* Construct UDP header */
718 b
->udph
.source
= htons(68);
719 b
->udph
.dest
= htons(67);
720 b
->udph
.len
= htons(sizeof(struct bootp_pkt
) - sizeof(struct iphdr
));
721 /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */
723 /* Construct DHCP/BOOTP header */
724 b
->op
= BOOTP_REQUEST
;
725 if (dev
->type
< 256) /* check for false types */
726 b
->htype
= dev
->type
;
727 else if (dev
->type
== ARPHRD_IEEE802_TR
) /* fix for token ring */
728 b
->htype
= ARPHRD_IEEE802
;
729 else if (dev
->type
== ARPHRD_FDDI
)
730 b
->htype
= ARPHRD_ETHER
;
732 printk("Unknown ARP type 0x%04x for device %s\n", dev
->type
, dev
->name
);
733 b
->htype
= dev
->type
; /* can cause undefined behavior */
735 b
->hlen
= dev
->addr_len
;
738 memcpy(b
->hw_addr
, dev
->dev_addr
, dev
->addr_len
);
739 b
->secs
= htons(jiffies_diff
/ HZ
);
742 /* add DHCP options or BOOTP extensions */
744 if (ic_proto_enabled
& IC_USE_DHCP
)
745 ic_dhcp_init_options(b
->exten
);
748 ic_bootp_init_ext(b
->exten
);
750 /* Chain packet down the line... */
752 skb
->protocol
= htons(ETH_P_IP
);
753 if ((dev
->hard_header
&&
754 dev
->hard_header(skb
, dev
, ntohs(skb
->protocol
), dev
->broadcast
, dev
->dev_addr
, skb
->len
) < 0) ||
755 dev_queue_xmit(skb
) < 0)
761 * Copy BOOTP-supplied string if not already set.
763 static int __init
ic_bootp_string(char *dest
, char *src
, int len
, int max
)
769 memcpy(dest
, src
, len
);
776 * Process BOOTP extensions.
778 static void __init
ic_do_bootp_ext(u8
*ext
)
783 #ifdef IPCONFIG_DEBUG
786 printk("DHCP/BOOTP: Got extension %d:",*ext
);
787 for (c
=ext
+2; c
<ext
+2+ext
[1]; c
++)
793 case 1: /* Subnet mask */
794 if (ic_netmask
== NONE
)
795 memcpy(&ic_netmask
, ext
+1, 4);
797 case 3: /* Default gateway */
798 if (ic_gateway
== NONE
)
799 memcpy(&ic_gateway
, ext
+1, 4);
801 case 6: /* DNS server */
803 if (servers
> CONF_NAMESERVERS_MAX
)
804 servers
= CONF_NAMESERVERS_MAX
;
805 for (i
= 0; i
< servers
; i
++) {
806 if (ic_nameservers
[i
] == NONE
)
807 memcpy(&ic_nameservers
[i
], ext
+1+4*i
, 4);
810 case 12: /* Host name */
811 ic_bootp_string(utsname()->nodename
, ext
+1, *ext
, __NEW_UTS_LEN
);
812 ic_host_name_set
= 1;
814 case 15: /* Domain name (DNS) */
815 ic_bootp_string(ic_domain
, ext
+1, *ext
, sizeof(ic_domain
));
817 case 17: /* Root path */
818 if (!root_server_path
[0])
819 ic_bootp_string(root_server_path
, ext
+1, *ext
, sizeof(root_server_path
));
821 case 40: /* NIS Domain name (_not_ DNS) */
822 ic_bootp_string(utsname()->domainname
, ext
+1, *ext
, __NEW_UTS_LEN
);
829 * Receive BOOTP reply.
831 static int __init
ic_bootp_recv(struct sk_buff
*skb
, struct net_device
*dev
, struct packet_type
*pt
, struct net_device
*orig_dev
)
838 /* Perform verifications before taking the lock. */
839 if (skb
->pkt_type
== PACKET_OTHERHOST
)
842 if ((skb
= skb_share_check(skb
, GFP_ATOMIC
)) == NULL
)
845 if (!pskb_may_pull(skb
,
846 sizeof(struct iphdr
) +
847 sizeof(struct udphdr
)))
850 b
= (struct bootp_pkt
*)skb_network_header(skb
);
853 if (h
->ihl
!= 5 || h
->version
!= 4 || h
->protocol
!= IPPROTO_UDP
)
856 /* Fragments are not supported */
857 if (h
->frag_off
& htons(IP_OFFSET
| IP_MF
)) {
859 printk(KERN_ERR
"DHCP/BOOTP: Ignoring fragmented "
864 if (skb
->len
< ntohs(h
->tot_len
))
867 if (ip_fast_csum((char *) h
, h
->ihl
))
870 if (b
->udph
.source
!= htons(67) || b
->udph
.dest
!= htons(68))
873 if (ntohs(h
->tot_len
) < ntohs(b
->udph
.len
) + sizeof(struct iphdr
))
876 len
= ntohs(b
->udph
.len
) - sizeof(struct udphdr
);
877 ext_len
= len
- (sizeof(*b
) -
878 sizeof(struct iphdr
) -
879 sizeof(struct udphdr
) -
884 /* Ok the front looks good, make sure we can get at the rest. */
885 if (!pskb_may_pull(skb
, skb
->len
))
888 b
= (struct bootp_pkt
*)skb_network_header(skb
);
891 /* One reply at a time, please. */
892 spin_lock(&ic_recv_lock
);
894 /* If we already have a reply, just drop the packet */
898 /* Find the ic_device that the packet arrived on */
900 while (d
&& d
->dev
!= dev
)
903 goto drop_unlock
; /* should never happen */
905 /* Is it a reply to our BOOTP request? */
906 if (b
->op
!= BOOTP_REPLY
||
909 printk(KERN_ERR
"DHCP/BOOTP: Reply not for us, "
915 /* Parse extensions */
917 !memcmp(b
->exten
, ic_bootp_cookie
, 4)) { /* Check magic cookie */
918 u8
*end
= (u8
*) b
+ ntohs(b
->iph
.tot_len
);
922 if (ic_proto_enabled
& IC_USE_DHCP
) {
923 __be32 server_id
= NONE
;
927 while (ext
< end
&& *ext
!= 0xff) {
929 if (*opt
== 0) /* Padding */
935 case 53: /* Message type */
939 case 54: /* Server ID (IP address) */
941 memcpy(&server_id
, opt
+ 2, 4);
946 #ifdef IPCONFIG_DEBUG
947 printk("DHCP: Got message type %d\n", mt
);
952 /* While in the process of accepting one offer,
955 if (ic_myaddr
!= NONE
)
958 /* Let's accept that offer. */
959 ic_myaddr
= b
->your_ip
;
960 ic_servaddr
= server_id
;
961 #ifdef IPCONFIG_DEBUG
962 printk("DHCP: Offered address %u.%u.%u.%u",
964 printk(" by server %u.%u.%u.%u\n",
965 NIPQUAD(ic_servaddr
));
967 /* The DHCP indicated server address takes
968 * precedence over the bootp header one if
969 * they are different.
971 if ((server_id
!= NONE
) &&
972 (b
->server_ip
!= server_id
))
973 b
->server_ip
= ic_servaddr
;
977 if (memcmp(dev
->dev_addr
, b
->hw_addr
, dev
->addr_len
) != 0)
984 /* Urque. Forget it*/
990 ic_dhcp_msgtype
= mt
;
993 #endif /* IPCONFIG_DHCP */
996 while (ext
< end
&& *ext
!= 0xff) {
998 if (*opt
== 0) /* Padding */
1002 ic_do_bootp_ext(opt
);
1006 /* We have a winner! */
1008 ic_myaddr
= b
->your_ip
;
1009 ic_servaddr
= b
->server_ip
;
1010 if (ic_gateway
== NONE
&& b
->relay_ip
)
1011 ic_gateway
= b
->relay_ip
;
1012 if (ic_nameservers
[0] == NONE
)
1013 ic_nameservers
[0] = ic_servaddr
;
1014 ic_got_reply
= IC_BOOTP
;
1017 /* Show's over. Nothing to see here. */
1018 spin_unlock(&ic_recv_lock
);
1021 /* Throw the packet out. */
1032 * Dynamic IP configuration -- DHCP, BOOTP, RARP.
1035 #ifdef IPCONFIG_DYNAMIC
1037 static int __init
ic_dynamic(void)
1040 struct ic_device
*d
;
1041 unsigned long start_jiffies
, timeout
, jiff
;
1042 int do_bootp
= ic_proto_have_if
& IC_BOOTP
;
1043 int do_rarp
= ic_proto_have_if
& IC_RARP
;
1046 * If none of DHCP/BOOTP/RARP was selected, return with an error.
1047 * This routine gets only called when some pieces of information
1048 * are missing, and without DHCP/BOOTP/RARP we are unable to get it.
1050 if (!ic_proto_enabled
) {
1051 printk(KERN_ERR
"IP-Config: Incomplete network configuration information.\n");
1055 #ifdef IPCONFIG_BOOTP
1056 if ((ic_proto_enabled
^ ic_proto_have_if
) & IC_BOOTP
)
1057 printk(KERN_ERR
"DHCP/BOOTP: No suitable device found.\n");
1059 #ifdef IPCONFIG_RARP
1060 if ((ic_proto_enabled
^ ic_proto_have_if
) & IC_RARP
)
1061 printk(KERN_ERR
"RARP: No suitable device found.\n");
1064 if (!ic_proto_have_if
)
1065 /* Error message already printed */
1071 #ifdef IPCONFIG_BOOTP
1075 #ifdef IPCONFIG_RARP
1081 * Send requests and wait, until we get an answer. This loop
1082 * seems to be a terrible waste of CPU time, but actually there is
1083 * only one process running at all, so we don't need to use any
1084 * scheduler functions.
1085 * [Actually we could now, but the nothing else running note still
1088 printk(KERN_NOTICE
"Sending %s%s%s requests .",
1090 ? ((ic_proto_enabled
& IC_USE_DHCP
) ? "DHCP" : "BOOTP") : "",
1091 (do_bootp
&& do_rarp
) ? " and " : "",
1092 do_rarp
? "RARP" : "");
1094 start_jiffies
= jiffies
;
1096 retries
= CONF_SEND_RETRIES
;
1097 get_random_bytes(&timeout
, sizeof(timeout
));
1098 timeout
= CONF_BASE_TIMEOUT
+ (timeout
% (unsigned) CONF_TIMEOUT_RANDOM
);
1100 #ifdef IPCONFIG_BOOTP
1101 if (do_bootp
&& (d
->able
& IC_BOOTP
))
1102 ic_bootp_send_if(d
, jiffies
- start_jiffies
);
1104 #ifdef IPCONFIG_RARP
1105 if (do_rarp
&& (d
->able
& IC_RARP
))
1109 jiff
= jiffies
+ (d
->next
? CONF_INTER_TIMEOUT
: timeout
);
1110 while (time_before(jiffies
, jiff
) && !ic_got_reply
)
1111 schedule_timeout_uninterruptible(1);
1112 #ifdef IPCONFIG_DHCP
1113 /* DHCP isn't done until we get a DHCPACK. */
1114 if ((ic_got_reply
& IC_BOOTP
)
1115 && (ic_proto_enabled
& IC_USE_DHCP
)
1116 && ic_dhcp_msgtype
!= DHCPACK
)
1122 #endif /* IPCONFIG_DHCP */
1133 printk(" timed out!\n");
1139 timeout
= timeout CONF_TIMEOUT_MULT
;
1140 if (timeout
> CONF_TIMEOUT_MAX
)
1141 timeout
= CONF_TIMEOUT_MAX
;
1146 #ifdef IPCONFIG_BOOTP
1150 #ifdef IPCONFIG_RARP
1155 if (!ic_got_reply
) {
1160 printk("IP-Config: Got %s answer from %u.%u.%u.%u, ",
1161 ((ic_got_reply
& IC_RARP
) ? "RARP"
1162 : (ic_proto_enabled
& IC_USE_DHCP
) ? "DHCP" : "BOOTP"),
1163 NIPQUAD(ic_servaddr
));
1164 printk("my address is %u.%u.%u.%u\n", NIPQUAD(ic_myaddr
));
1169 #endif /* IPCONFIG_DYNAMIC */
1171 #ifdef CONFIG_PROC_FS
1173 static int pnp_seq_show(struct seq_file
*seq
, void *v
)
1177 if (ic_proto_used
& IC_PROTO
)
1178 seq_printf(seq
, "#PROTO: %s\n",
1179 (ic_proto_used
& IC_RARP
) ? "RARP"
1180 : (ic_proto_used
& IC_USE_DHCP
) ? "DHCP" : "BOOTP");
1182 seq_puts(seq
, "#MANUAL\n");
1186 "domain %s\n", ic_domain
);
1187 for (i
= 0; i
< CONF_NAMESERVERS_MAX
; i
++) {
1188 if (ic_nameservers
[i
] != NONE
)
1190 "nameserver %u.%u.%u.%u\n",
1191 NIPQUAD(ic_nameservers
[i
]));
1193 if (ic_servaddr
!= NONE
)
1195 "bootserver %u.%u.%u.%u\n",
1196 NIPQUAD(ic_servaddr
));
1200 static int pnp_seq_open(struct inode
*indoe
, struct file
*file
)
1202 return single_open(file
, pnp_seq_show
, NULL
);
1205 static const struct file_operations pnp_seq_fops
= {
1206 .owner
= THIS_MODULE
,
1207 .open
= pnp_seq_open
,
1209 .llseek
= seq_lseek
,
1210 .release
= single_release
,
1212 #endif /* CONFIG_PROC_FS */
1215 * Extract IP address from the parameter string if needed. Note that we
1216 * need to have root_server_addr set _before_ IPConfig gets called as it
1219 __be32 __init
root_nfs_parse_addr(char *name
)
1226 while (octets
< 4) {
1227 while (*cp
>= '0' && *cp
<= '9')
1229 if (cp
== cq
|| cp
- cq
> 3)
1231 if (*cp
== '.' || octets
== 3)
1237 if (octets
== 4 && (*cp
== ':' || *cp
== '\0')) {
1240 addr
= in_aton(name
);
1241 memmove(name
, cp
, strlen(cp
) + 1);
1249 * IP Autoconfig dispatcher.
1252 static int __init
ip_auto_config(void)
1256 #ifdef CONFIG_PROC_FS
1257 proc_net_fops_create(&init_net
, "pnp", S_IRUGO
, &pnp_seq_fops
);
1258 #endif /* CONFIG_PROC_FS */
1263 DBG(("IP-Config: Entered.\n"));
1264 #ifdef IPCONFIG_DYNAMIC
1267 /* Give hardware a chance to settle */
1268 msleep(CONF_PRE_OPEN
);
1270 /* Setup all network devices */
1271 if (ic_open_devs() < 0)
1274 /* Give drivers a chance to settle */
1275 ssleep(CONF_POST_OPEN
);
1278 * If the config information is insufficient (e.g., our IP address or
1279 * IP address of the boot server is missing or we have multiple network
1280 * interfaces and no default was set), use BOOTP or RARP to get the
1283 if (ic_myaddr
== NONE
||
1284 #ifdef CONFIG_ROOT_NFS
1285 (root_server_addr
== NONE
1286 && ic_servaddr
== NONE
1287 && ROOT_DEV
== Root_NFS
) ||
1289 ic_first_dev
->next
) {
1290 #ifdef IPCONFIG_DYNAMIC
1292 int retries
= CONF_OPEN_RETRIES
;
1294 if (ic_dynamic() < 0) {
1298 * I don't know why, but sometimes the
1299 * eepro100 driver (at least) gets upset and
1300 * doesn't work the first time it's opened.
1301 * But then if you close it and reopen it, it
1302 * works just fine. So we need to try that at
1303 * least once before giving up.
1305 * Also, if the root will be NFS-mounted, we
1306 * have nowhere to go if DHCP fails. So we
1307 * just have to keep trying forever.
1311 #ifdef CONFIG_ROOT_NFS
1312 if (ROOT_DEV
== Root_NFS
) {
1314 "IP-Config: Retrying forever (NFS root)...\n");
1321 "IP-Config: Reopening network devices...\n");
1325 /* Oh, well. At least we tried. */
1326 printk(KERN_ERR
"IP-Config: Auto-configuration of network failed.\n");
1329 #else /* !DYNAMIC */
1330 printk(KERN_ERR
"IP-Config: Incomplete network configuration information.\n");
1333 #endif /* IPCONFIG_DYNAMIC */
1335 /* Device selected manually or only one device -> use it */
1336 ic_dev
= ic_first_dev
->dev
;
1339 addr
= root_nfs_parse_addr(root_server_path
);
1340 if (root_server_addr
== NONE
)
1341 root_server_addr
= addr
;
1344 * Use defaults whereever applicable.
1346 if (ic_defaults() < 0)
1350 * Close all network devices except the device we've
1351 * autoconfigured and set up routes.
1354 if (ic_setup_if() < 0 || ic_setup_routes() < 0)
1358 * Record which protocol was actually used.
1360 #ifdef IPCONFIG_DYNAMIC
1361 ic_proto_used
= ic_got_reply
| (ic_proto_enabled
& IC_USE_DHCP
);
1364 #ifndef IPCONFIG_SILENT
1366 * Clue in the operator.
1368 printk("IP-Config: Complete:");
1369 printk("\n device=%s", ic_dev
->name
);
1370 printk(", addr=%u.%u.%u.%u", NIPQUAD(ic_myaddr
));
1371 printk(", mask=%u.%u.%u.%u", NIPQUAD(ic_netmask
));
1372 printk(", gw=%u.%u.%u.%u", NIPQUAD(ic_gateway
));
1373 printk(",\n host=%s, domain=%s, nis-domain=%s",
1374 utsname()->nodename
, ic_domain
, utsname()->domainname
);
1375 printk(",\n bootserver=%u.%u.%u.%u", NIPQUAD(ic_servaddr
));
1376 printk(", rootserver=%u.%u.%u.%u", NIPQUAD(root_server_addr
));
1377 printk(", rootpath=%s", root_server_path
);
1379 #endif /* !SILENT */
1384 late_initcall(ip_auto_config
);
1388 * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
1389 * command line parameter. It consists of option fields separated by colons in
1390 * the following order:
1392 * <client-ip>:<server-ip>:<gw-ip>:<netmask>:<host name>:<device>:<PROTO>
1394 * Any of the fields can be empty which means to use a default value:
1395 * <client-ip> - address given by BOOTP or RARP
1396 * <server-ip> - address of host returning BOOTP or RARP packet
1397 * <gw-ip> - none, or the address returned by BOOTP
1398 * <netmask> - automatically determined from <client-ip>, or the
1399 * one returned by BOOTP
1400 * <host name> - <client-ip> in ASCII notation, or the name returned
1402 * <device> - use all available devices
1404 * off|none - don't do autoconfig at all (DEFAULT)
1405 * on|any - use any configured protocol
1406 * dhcp|bootp|rarp - use only the specified protocol
1407 * both - use both BOOTP and RARP (not DHCP)
1409 static int __init
ic_proto_name(char *name
)
1411 if (!strcmp(name
, "on") || !strcmp(name
, "any")) {
1414 #ifdef CONFIG_IP_PNP_DHCP
1415 else if (!strcmp(name
, "dhcp")) {
1416 ic_proto_enabled
&= ~IC_RARP
;
1420 #ifdef CONFIG_IP_PNP_BOOTP
1421 else if (!strcmp(name
, "bootp")) {
1422 ic_proto_enabled
&= ~(IC_RARP
| IC_USE_DHCP
);
1426 #ifdef CONFIG_IP_PNP_RARP
1427 else if (!strcmp(name
, "rarp")) {
1428 ic_proto_enabled
&= ~(IC_BOOTP
| IC_USE_DHCP
);
1432 #ifdef IPCONFIG_DYNAMIC
1433 else if (!strcmp(name
, "both")) {
1434 ic_proto_enabled
&= ~IC_USE_DHCP
; /* backward compat :-( */
1441 static int __init
ip_auto_config_setup(char *addrs
)
1446 ic_set_manually
= 1;
1448 ic_enable
= (*addrs
&&
1449 (strcmp(addrs
, "off") != 0) &&
1450 (strcmp(addrs
, "none") != 0));
1454 if (ic_proto_name(addrs
))
1457 /* Parse the whole string */
1460 if ((cp
= strchr(ip
, ':')))
1462 if (strlen(ip
) > 0) {
1463 DBG(("IP-Config: Parameter #%d: `%s'\n", num
, ip
));
1466 if ((ic_myaddr
= in_aton(ip
)) == INADDR_ANY
)
1470 if ((ic_servaddr
= in_aton(ip
)) == INADDR_ANY
)
1474 if ((ic_gateway
= in_aton(ip
)) == INADDR_ANY
)
1478 if ((ic_netmask
= in_aton(ip
)) == INADDR_ANY
)
1482 if ((dp
= strchr(ip
, '.'))) {
1484 strlcpy(utsname()->domainname
, dp
,
1485 sizeof(utsname()->domainname
));
1487 strlcpy(utsname()->nodename
, ip
,
1488 sizeof(utsname()->nodename
));
1489 ic_host_name_set
= 1;
1492 strlcpy(user_dev_name
, ip
, sizeof(user_dev_name
));
1506 static int __init
nfsaddrs_config_setup(char *addrs
)
1508 return ip_auto_config_setup(addrs
);
1511 __setup("ip=", ip_auto_config_setup
);
1512 __setup("nfsaddrs=", nfsaddrs_config_setup
);