2 * Automatic Configuration of IP -- use DHCP, BOOTP, RARP, or
3 * user-supplied information to configure own IP address and routes.
5 * Copyright (C) 1996-1998 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
7 * Derived from network configuration code in fs/nfs/nfsroot.c,
8 * originally Copyright (C) 1995, 1996 Gero Kuhlmann and me.
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
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
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
22 * Ported DHCP support from 2.2.16 to 2.4.0-test4
23 * -- Eric Biederman <ebiederman@lnxi.com>, 30 Aug 2000
25 * Merged changes from 2.2.19 into 2.4.3
26 * -- Eric Biederman <ebiederman@lnxi.com>, 22 April Aug 2001
28 * Multiple Nameservers in /proc/net/pnp
29 * -- Josef Siemes <jsiemes@web.de>, Aug 2002
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>
41 #include <linux/inet.h>
42 #include <linux/inetdevice.h>
43 #include <linux/netdevice.h>
44 #include <linux/if_arp.h>
45 #include <linux/skbuff.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>
55 #include <linux/nfs_fs.h>
56 #include <linux/slab.h>
57 #include <linux/export.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 #if defined(CONFIG_IP_PNP_DHCP)
71 #if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_DHCP)
72 #define IPCONFIG_BOOTP
74 #if defined(CONFIG_IP_PNP_RARP)
77 #if defined(IPCONFIG_BOOTP) || defined(IPCONFIG_RARP)
78 #define IPCONFIG_DYNAMIC
81 /* Define the friendly delay before and after opening net devices */
82 #define CONF_POST_OPEN 10 /* After opening: 10 msecs */
83 #define CONF_CARRIER_TIMEOUT 120000 /* Wait for carrier timeout */
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 */
88 #define CONF_INTER_TIMEOUT (HZ) /* Inter-device timeout: 1 second */
89 #define CONF_BASE_TIMEOUT (HZ*2) /* Initial timeout: 2 seconds */
90 #define CONF_TIMEOUT_RANDOM (HZ) /* Maximum amount of randomization */
91 #define CONF_TIMEOUT_MULT *7/4 /* Rate of timeout growth */
92 #define CONF_TIMEOUT_MAX (HZ*30) /* Maximum allowed timeout */
93 #define CONF_NAMESERVERS_MAX 3 /* Maximum number of nameservers
94 - '3' from resolv.h */
96 #define NONE cpu_to_be32(INADDR_NONE)
97 #define ANY cpu_to_be32(INADDR_ANY)
100 * Public IP configuration
103 /* This is used by platforms which might be able to set the ipconfig
104 * variables using firmware environment vars. If this is set, it will
105 * ignore such firmware variables.
107 int ic_set_manually __initdata
= 0; /* IPconfig parameters set manually */
109 static int ic_enable __initdata
; /* IP config enabled? */
111 /* Protocol choice */
112 int ic_proto_enabled __initdata
= 0
113 #ifdef IPCONFIG_BOOTP
116 #ifdef CONFIG_IP_PNP_DHCP
124 static int ic_host_name_set __initdata
; /* Host name set by us? */
126 __be32 ic_myaddr
= NONE
; /* My IP address */
127 static __be32 ic_netmask
= NONE
; /* Netmask for local subnet */
128 __be32 ic_gateway
= NONE
; /* Gateway IP address */
130 __be32 ic_addrservaddr
= NONE
; /* IP Address of the IP addresses'server */
132 __be32 ic_servaddr
= NONE
; /* Boot server IP address */
134 __be32 root_server_addr
= NONE
; /* Address of NFS server */
135 u8 root_server_path
[256] = { 0, }; /* Path to mount as root */
137 /* vendor class identifier */
138 static char vendor_class_identifier
[253] __initdata
;
140 #if defined(CONFIG_IP_PNP_DHCP)
141 static char dhcp_client_identifier
[253] __initdata
;
144 /* Persistent data: */
146 static int ic_proto_used
; /* Protocol used, if any */
147 static __be32 ic_nameservers
[CONF_NAMESERVERS_MAX
]; /* DNS Server IP addresses */
148 static u8 ic_domain
[64]; /* DNS (not NIS) domain name */
154 /* Name of user-selected boot device */
155 static char user_dev_name
[IFNAMSIZ
] __initdata
= { 0, };
157 /* Protocols supported by available interfaces */
158 static int ic_proto_have_if __initdata
;
160 /* MTU for boot device */
161 static int ic_dev_mtu __initdata
;
163 #ifdef IPCONFIG_DYNAMIC
164 static DEFINE_SPINLOCK(ic_recv_lock
);
165 static volatile int ic_got_reply __initdata
; /* Proto(s) that replied */
168 static int ic_dhcp_msgtype __initdata
; /* DHCP msg type received */
177 struct ic_device
*next
;
178 struct net_device
*dev
;
179 unsigned short flags
;
184 static struct ic_device
*ic_first_dev __initdata
; /* List of open device */
185 static struct net_device
*ic_dev __initdata
; /* Selected device */
187 static bool __init
ic_is_init_dev(struct net_device
*dev
)
189 if (dev
->flags
& IFF_LOOPBACK
)
191 return user_dev_name
[0] ? !strcmp(dev
->name
, user_dev_name
) :
192 (!(dev
->flags
& IFF_LOOPBACK
) &&
193 (dev
->flags
& (IFF_POINTOPOINT
|IFF_BROADCAST
)) &&
194 strncmp(dev
->name
, "dummy", 5));
197 static int __init
ic_open_devs(void)
199 struct ic_device
*d
, **last
;
200 struct net_device
*dev
;
201 unsigned short oflags
;
202 unsigned long start
, next_msg
;
204 last
= &ic_first_dev
;
207 /* bring loopback and DSA master network devices up first */
208 for_each_netdev(&init_net
, dev
) {
209 if (!(dev
->flags
& IFF_LOOPBACK
) && !netdev_uses_dsa(dev
))
211 if (dev_change_flags(dev
, dev
->flags
| IFF_UP
) < 0)
212 pr_err("IP-Config: Failed to open %s\n", dev
->name
);
215 for_each_netdev(&init_net
, dev
) {
216 if (ic_is_init_dev(dev
)) {
221 pr_warn("DHCP/BOOTP: Ignoring device %s, MTU %d too small\n",
222 dev
->name
, dev
->mtu
);
223 if (!(dev
->flags
& IFF_NOARP
))
225 able
&= ic_proto_enabled
;
226 if (ic_proto_enabled
&& !able
)
229 if (dev_change_flags(dev
, oflags
| IFF_UP
) < 0) {
230 pr_err("IP-Config: Failed to open %s\n",
234 if (!(d
= kmalloc(sizeof(struct ic_device
), GFP_KERNEL
))) {
244 get_random_bytes(&d
->xid
, sizeof(__be32
));
247 ic_proto_have_if
|= able
;
248 pr_debug("IP-Config: %s UP (able=%d, xid=%08x)\n",
249 dev
->name
, able
, d
->xid
);
253 /* no point in waiting if we could not bring up at least one device */
257 /* wait for a carrier on at least one device */
259 next_msg
= start
+ msecs_to_jiffies(CONF_CARRIER_TIMEOUT
/12);
260 while (time_before(jiffies
, start
+
261 msecs_to_jiffies(CONF_CARRIER_TIMEOUT
))) {
264 for_each_netdev(&init_net
, dev
)
265 if (ic_is_init_dev(dev
) && netif_carrier_ok(dev
))
270 if (time_before(jiffies
, next_msg
))
273 elapsed
= jiffies_to_msecs(jiffies
- start
);
274 wait
= (CONF_CARRIER_TIMEOUT
- elapsed
+ 500)/1000;
275 pr_info("Waiting up to %d more seconds for network.\n", wait
);
276 next_msg
= jiffies
+ msecs_to_jiffies(CONF_CARRIER_TIMEOUT
/12);
284 if (user_dev_name
[0])
285 pr_err("IP-Config: Device `%s' not found\n",
288 pr_err("IP-Config: No network devices available\n");
294 static void __init
ic_close_devs(void)
296 struct ic_device
*d
, *next
;
297 struct net_device
*dev
;
304 if (dev
!= ic_dev
&& !netdev_uses_dsa(dev
)) {
305 pr_debug("IP-Config: Downing %s\n", dev
->name
);
306 dev_change_flags(dev
, d
->flags
);
314 * Interface to various network functions.
318 set_sockaddr(struct sockaddr_in
*sin
, __be32 addr
, __be16 port
)
320 sin
->sin_family
= AF_INET
;
321 sin
->sin_addr
.s_addr
= addr
;
322 sin
->sin_port
= port
;
325 static int __init
ic_devinet_ioctl(unsigned int cmd
, struct ifreq
*arg
)
329 mm_segment_t oldfs
= get_fs();
331 res
= devinet_ioctl(&init_net
, cmd
, (struct ifreq __user
*) arg
);
336 static int __init
ic_dev_ioctl(unsigned int cmd
, struct ifreq
*arg
)
340 mm_segment_t oldfs
= get_fs();
342 res
= dev_ioctl(&init_net
, cmd
, (struct ifreq __user
*) arg
);
347 static int __init
ic_route_ioctl(unsigned int cmd
, struct rtentry
*arg
)
351 mm_segment_t oldfs
= get_fs();
353 res
= ip_rt_ioctl(&init_net
, cmd
, (void __user
*) arg
);
359 * Set up interface addresses and routes.
362 static int __init
ic_setup_if(void)
365 struct sockaddr_in
*sin
= (void *) &ir
.ifr_ifru
.ifru_addr
;
368 memset(&ir
, 0, sizeof(ir
));
369 strcpy(ir
.ifr_ifrn
.ifrn_name
, ic_dev
->name
);
370 set_sockaddr(sin
, ic_myaddr
, 0);
371 if ((err
= ic_devinet_ioctl(SIOCSIFADDR
, &ir
)) < 0) {
372 pr_err("IP-Config: Unable to set interface address (%d)\n",
376 set_sockaddr(sin
, ic_netmask
, 0);
377 if ((err
= ic_devinet_ioctl(SIOCSIFNETMASK
, &ir
)) < 0) {
378 pr_err("IP-Config: Unable to set interface netmask (%d)\n",
382 set_sockaddr(sin
, ic_myaddr
| ~ic_netmask
, 0);
383 if ((err
= ic_devinet_ioctl(SIOCSIFBRDADDR
, &ir
)) < 0) {
384 pr_err("IP-Config: Unable to set interface broadcast address (%d)\n",
388 /* Handle the case where we need non-standard MTU on the boot link (a network
389 * using jumbo frames, for instance). If we can't set the mtu, don't error
390 * out, we'll try to muddle along.
392 if (ic_dev_mtu
!= 0) {
393 strcpy(ir
.ifr_name
, ic_dev
->name
);
394 ir
.ifr_mtu
= ic_dev_mtu
;
395 if ((err
= ic_dev_ioctl(SIOCSIFMTU
, &ir
)) < 0)
396 pr_err("IP-Config: Unable to set interface mtu to %d (%d)\n",
402 static int __init
ic_setup_routes(void)
404 /* No need to setup device routes, only the default route... */
406 if (ic_gateway
!= NONE
) {
410 memset(&rm
, 0, sizeof(rm
));
411 if ((ic_gateway
^ ic_myaddr
) & ic_netmask
) {
412 pr_err("IP-Config: Gateway not on directly connected network\n");
415 set_sockaddr((struct sockaddr_in
*) &rm
.rt_dst
, 0, 0);
416 set_sockaddr((struct sockaddr_in
*) &rm
.rt_genmask
, 0, 0);
417 set_sockaddr((struct sockaddr_in
*) &rm
.rt_gateway
, ic_gateway
, 0);
418 rm
.rt_flags
= RTF_UP
| RTF_GATEWAY
;
419 if ((err
= ic_route_ioctl(SIOCADDRT
, &rm
)) < 0) {
420 pr_err("IP-Config: Cannot add default route (%d)\n",
430 * Fill in default values for all missing parameters.
433 static int __init
ic_defaults(void)
436 * At this point we have no userspace running so need not
437 * claim locks on system_utsname
440 if (!ic_host_name_set
)
441 sprintf(init_utsname()->nodename
, "%pI4", &ic_myaddr
);
443 if (root_server_addr
== NONE
)
444 root_server_addr
= ic_servaddr
;
446 if (ic_netmask
== NONE
) {
447 if (IN_CLASSA(ntohl(ic_myaddr
)))
448 ic_netmask
= htonl(IN_CLASSA_NET
);
449 else if (IN_CLASSB(ntohl(ic_myaddr
)))
450 ic_netmask
= htonl(IN_CLASSB_NET
);
451 else if (IN_CLASSC(ntohl(ic_myaddr
)))
452 ic_netmask
= htonl(IN_CLASSC_NET
);
454 pr_err("IP-Config: Unable to guess netmask for address %pI4\n",
458 pr_notice("IP-Config: Guessing netmask %pI4\n",
471 static int ic_rarp_recv(struct sk_buff
*skb
, struct net_device
*dev
, struct packet_type
*pt
, struct net_device
*orig_dev
);
473 static struct packet_type rarp_packet_type __initdata
= {
474 .type
= cpu_to_be16(ETH_P_RARP
),
475 .func
= ic_rarp_recv
,
478 static inline void __init
ic_rarp_init(void)
480 dev_add_pack(&rarp_packet_type
);
483 static inline void __init
ic_rarp_cleanup(void)
485 dev_remove_pack(&rarp_packet_type
);
489 * Process received RARP packet.
492 ic_rarp_recv(struct sk_buff
*skb
, struct net_device
*dev
, struct packet_type
*pt
, struct net_device
*orig_dev
)
495 unsigned char *rarp_ptr
;
497 unsigned char *tha
; /* t for "target" */
500 if (!net_eq(dev_net(dev
), &init_net
))
503 skb
= skb_share_check(skb
, GFP_ATOMIC
);
507 if (!pskb_may_pull(skb
, sizeof(struct arphdr
)))
510 /* Basic sanity checks can be done without the lock. */
511 rarp
= (struct arphdr
*)skb_transport_header(skb
);
513 /* If this test doesn't pass, it's not IP, or we should
516 if (rarp
->ar_hln
!= dev
->addr_len
|| dev
->type
!= ntohs(rarp
->ar_hrd
))
519 /* If it's not a RARP reply, delete it. */
520 if (rarp
->ar_op
!= htons(ARPOP_RREPLY
))
523 /* If it's not Ethernet, delete it. */
524 if (rarp
->ar_pro
!= htons(ETH_P_IP
))
527 if (!pskb_may_pull(skb
, arp_hdr_len(dev
)))
530 /* OK, it is all there and looks valid, process... */
531 rarp
= (struct arphdr
*)skb_transport_header(skb
);
532 rarp_ptr
= (unsigned char *) (rarp
+ 1);
534 /* One reply at a time, please. */
535 spin_lock(&ic_recv_lock
);
537 /* If we already have a reply, just drop the packet */
541 /* Find the ic_device that the packet arrived on */
543 while (d
&& d
->dev
!= dev
)
546 goto drop_unlock
; /* should never happen */
548 /* Extract variable-width fields */
549 rarp_ptr
+= dev
->addr_len
;
550 memcpy(&sip
, rarp_ptr
, 4);
553 rarp_ptr
+= dev
->addr_len
;
554 memcpy(&tip
, rarp_ptr
, 4);
556 /* Discard packets which are not meant for us. */
557 if (memcmp(tha
, dev
->dev_addr
, dev
->addr_len
))
560 /* Discard packets which are not from specified server. */
561 if (ic_servaddr
!= NONE
&& ic_servaddr
!= sip
)
564 /* We have a winner! */
566 if (ic_myaddr
== NONE
)
569 ic_addrservaddr
= sip
;
570 ic_got_reply
= IC_RARP
;
573 /* Show's over. Nothing to see here. */
574 spin_unlock(&ic_recv_lock
);
577 /* Throw the packet out. */
584 * Send RARP request packet over a single interface.
586 static void __init
ic_rarp_send_if(struct ic_device
*d
)
588 struct net_device
*dev
= d
->dev
;
589 arp_send(ARPOP_RREQUEST
, ETH_P_RARP
, 0, dev
, 0, NULL
,
590 dev
->dev_addr
, dev
->dev_addr
);
595 * Predefine Nameservers
597 static inline void __init
ic_nameservers_predef(void)
601 for (i
= 0; i
< CONF_NAMESERVERS_MAX
; i
++)
602 ic_nameservers
[i
] = NONE
;
606 * DHCP/BOOTP support.
609 #ifdef IPCONFIG_BOOTP
611 struct bootp_pkt
{ /* BOOTP packet format */
612 struct iphdr iph
; /* IP header */
613 struct udphdr udph
; /* UDP header */
614 u8 op
; /* 1=request, 2=reply */
615 u8 htype
; /* HW address type */
616 u8 hlen
; /* HW address length */
617 u8 hops
; /* Used only by gateways */
618 __be32 xid
; /* Transaction ID */
619 __be16 secs
; /* Seconds since we started */
620 __be16 flags
; /* Just what it says */
621 __be32 client_ip
; /* Client's IP address if known */
622 __be32 your_ip
; /* Assigned IP address */
623 __be32 server_ip
; /* (Next, e.g. NFS) Server's IP address */
624 __be32 relay_ip
; /* IP address of BOOTP relay */
625 u8 hw_addr
[16]; /* Client's HW address */
626 u8 serv_name
[64]; /* Server host name */
627 u8 boot_file
[128]; /* Name of boot file */
628 u8 exten
[312]; /* DHCP options / BOOTP vendor extensions */
632 #define BOOTP_REQUEST 1
633 #define BOOTP_REPLY 2
635 /* DHCP message types */
636 #define DHCPDISCOVER 1
638 #define DHCPREQUEST 3
639 #define DHCPDECLINE 4
642 #define DHCPRELEASE 7
645 static int ic_bootp_recv(struct sk_buff
*skb
, struct net_device
*dev
, struct packet_type
*pt
, struct net_device
*orig_dev
);
647 static struct packet_type bootp_packet_type __initdata
= {
648 .type
= cpu_to_be16(ETH_P_IP
),
649 .func
= ic_bootp_recv
,
652 static __be32 ic_dev_xid
; /* Device under configuration */
655 * Initialize DHCP/BOOTP extension fields in the request.
658 static const u8 ic_bootp_cookie
[4] = { 99, 130, 83, 99 };
663 ic_dhcp_init_options(u8
*options
)
665 u8 mt
= ((ic_servaddr
== NONE
)
666 ? DHCPDISCOVER
: DHCPREQUEST
);
670 pr_debug("DHCP: Sending message type %d\n", mt
);
672 memcpy(e
, ic_bootp_cookie
, 4); /* RFC1048 Magic Cookie */
675 *e
++ = 53; /* DHCP message type */
679 if (mt
== DHCPREQUEST
) {
680 *e
++ = 54; /* Server ID (IP address) */
682 memcpy(e
, &ic_servaddr
, 4);
685 *e
++ = 50; /* Requested IP address */
687 memcpy(e
, &ic_myaddr
, 4);
693 static const u8 ic_req_params
[] = {
695 3, /* Default gateway */
698 15, /* Domain name */
701 40, /* NIS domain name */
704 *e
++ = 55; /* Parameter request list */
705 *e
++ = sizeof(ic_req_params
);
706 memcpy(e
, ic_req_params
, sizeof(ic_req_params
));
707 e
+= sizeof(ic_req_params
);
709 if (ic_host_name_set
) {
710 *e
++ = 12; /* host-name */
711 len
= strlen(utsname()->nodename
);
713 memcpy(e
, utsname()->nodename
, len
);
716 if (*vendor_class_identifier
) {
717 pr_info("DHCP: sending class identifier \"%s\"\n",
718 vendor_class_identifier
);
719 *e
++ = 60; /* Class-identifier */
720 len
= strlen(vendor_class_identifier
);
722 memcpy(e
, vendor_class_identifier
, len
);
725 len
= strlen(dhcp_client_identifier
+ 1);
726 /* the minimum length of identifier is 2, include 1 byte type,
727 * and can not be larger than the length of options
729 if (len
>= 1 && len
< 312 - (e
- options
) - 1) {
732 memcpy(e
, dhcp_client_identifier
, len
+ 1);
737 *e
++ = 255; /* End of the list */
740 #endif /* IPCONFIG_DHCP */
742 static void __init
ic_bootp_init_ext(u8
*e
)
744 memcpy(e
, ic_bootp_cookie
, 4); /* RFC1048 Magic Cookie */
746 *e
++ = 1; /* Subnet mask request */
749 *e
++ = 3; /* Default gateway request */
752 *e
++ = 5; /* Name server request */
755 *e
++ = 12; /* Host name request */
758 *e
++ = 40; /* NIS Domain name request */
761 *e
++ = 17; /* Boot path */
765 *e
++ = 57; /* set extension buffer size for reply */
767 *e
++ = 1; /* 128+236+8+20+14, see dhcpd sources */
770 *e
++ = 255; /* End of the list */
775 * Initialize the DHCP/BOOTP mechanism.
777 static inline void __init
ic_bootp_init(void)
779 ic_nameservers_predef();
781 dev_add_pack(&bootp_packet_type
);
786 * DHCP/BOOTP cleanup.
788 static inline void __init
ic_bootp_cleanup(void)
790 dev_remove_pack(&bootp_packet_type
);
795 * Send DHCP/BOOTP request to single interface.
797 static void __init
ic_bootp_send_if(struct ic_device
*d
, unsigned long jiffies_diff
)
799 struct net_device
*dev
= d
->dev
;
803 int hlen
= LL_RESERVED_SPACE(dev
);
804 int tlen
= dev
->needed_tailroom
;
806 /* Allocate packet */
807 skb
= alloc_skb(sizeof(struct bootp_pkt
) + hlen
+ tlen
+ 15,
811 skb_reserve(skb
, hlen
);
812 b
= (struct bootp_pkt
*) skb_put(skb
, sizeof(struct bootp_pkt
));
813 memset(b
, 0, sizeof(struct bootp_pkt
));
815 /* Construct IP header */
816 skb_reset_network_header(skb
);
820 h
->tot_len
= htons(sizeof(struct bootp_pkt
));
821 h
->frag_off
= htons(IP_DF
);
823 h
->protocol
= IPPROTO_UDP
;
824 h
->daddr
= htonl(INADDR_BROADCAST
);
825 h
->check
= ip_fast_csum((unsigned char *) h
, h
->ihl
);
827 /* Construct UDP header */
828 b
->udph
.source
= htons(68);
829 b
->udph
.dest
= htons(67);
830 b
->udph
.len
= htons(sizeof(struct bootp_pkt
) - sizeof(struct iphdr
));
831 /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */
833 /* Construct DHCP/BOOTP header */
834 b
->op
= BOOTP_REQUEST
;
835 if (dev
->type
< 256) /* check for false types */
836 b
->htype
= dev
->type
;
837 else if (dev
->type
== ARPHRD_FDDI
)
838 b
->htype
= ARPHRD_ETHER
;
840 pr_warn("Unknown ARP type 0x%04x for device %s\n", dev
->type
,
842 b
->htype
= dev
->type
; /* can cause undefined behavior */
845 /* server_ip and your_ip address are both already zero per RFC2131 */
846 b
->hlen
= dev
->addr_len
;
847 memcpy(b
->hw_addr
, dev
->dev_addr
, dev
->addr_len
);
848 b
->secs
= htons(jiffies_diff
/ HZ
);
851 /* add DHCP options or BOOTP extensions */
853 if (ic_proto_enabled
& IC_USE_DHCP
)
854 ic_dhcp_init_options(b
->exten
);
857 ic_bootp_init_ext(b
->exten
);
859 /* Chain packet down the line... */
861 skb
->protocol
= htons(ETH_P_IP
);
862 if (dev_hard_header(skb
, dev
, ntohs(skb
->protocol
),
863 dev
->broadcast
, dev
->dev_addr
, skb
->len
) < 0) {
869 if (dev_queue_xmit(skb
) < 0)
875 * Copy BOOTP-supplied string if not already set.
877 static int __init
ic_bootp_string(char *dest
, char *src
, int len
, int max
)
883 memcpy(dest
, src
, len
);
890 * Process BOOTP extensions.
892 static void __init
ic_do_bootp_ext(u8
*ext
)
900 pr_debug("DHCP/BOOTP: Got extension %d:", *ext
);
901 for (c
=ext
+2; c
<ext
+2+ext
[1]; c
++)
902 pr_debug(" %02x", *c
);
906 case 1: /* Subnet mask */
907 if (ic_netmask
== NONE
)
908 memcpy(&ic_netmask
, ext
+1, 4);
910 case 3: /* Default gateway */
911 if (ic_gateway
== NONE
)
912 memcpy(&ic_gateway
, ext
+1, 4);
914 case 6: /* DNS server */
916 if (servers
> CONF_NAMESERVERS_MAX
)
917 servers
= CONF_NAMESERVERS_MAX
;
918 for (i
= 0; i
< servers
; i
++) {
919 if (ic_nameservers
[i
] == NONE
)
920 memcpy(&ic_nameservers
[i
], ext
+1+4*i
, 4);
923 case 12: /* Host name */
924 ic_bootp_string(utsname()->nodename
, ext
+1, *ext
,
926 ic_host_name_set
= 1;
928 case 15: /* Domain name (DNS) */
929 ic_bootp_string(ic_domain
, ext
+1, *ext
, sizeof(ic_domain
));
931 case 17: /* Root path */
932 if (!root_server_path
[0])
933 ic_bootp_string(root_server_path
, ext
+1, *ext
,
934 sizeof(root_server_path
));
936 case 26: /* Interface MTU */
937 memcpy(&mtu
, ext
+1, sizeof(mtu
));
938 ic_dev_mtu
= ntohs(mtu
);
940 case 40: /* NIS Domain name (_not_ DNS) */
941 ic_bootp_string(utsname()->domainname
, ext
+1, *ext
,
949 * Receive BOOTP reply.
951 static int __init
ic_bootp_recv(struct sk_buff
*skb
, struct net_device
*dev
, struct packet_type
*pt
, struct net_device
*orig_dev
)
958 if (!net_eq(dev_net(dev
), &init_net
))
961 /* Perform verifications before taking the lock. */
962 if (skb
->pkt_type
== PACKET_OTHERHOST
)
965 skb
= skb_share_check(skb
, GFP_ATOMIC
);
969 if (!pskb_may_pull(skb
,
970 sizeof(struct iphdr
) +
971 sizeof(struct udphdr
)))
974 b
= (struct bootp_pkt
*)skb_network_header(skb
);
977 if (h
->ihl
!= 5 || h
->version
!= 4 || h
->protocol
!= IPPROTO_UDP
)
980 /* Fragments are not supported */
981 if (ip_is_fragment(h
)) {
982 net_err_ratelimited("DHCP/BOOTP: Ignoring fragmented reply\n");
986 if (skb
->len
< ntohs(h
->tot_len
))
989 if (ip_fast_csum((char *) h
, h
->ihl
))
992 if (b
->udph
.source
!= htons(67) || b
->udph
.dest
!= htons(68))
995 if (ntohs(h
->tot_len
) < ntohs(b
->udph
.len
) + sizeof(struct iphdr
))
998 len
= ntohs(b
->udph
.len
) - sizeof(struct udphdr
);
999 ext_len
= len
- (sizeof(*b
) -
1000 sizeof(struct iphdr
) -
1001 sizeof(struct udphdr
) -
1006 /* Ok the front looks good, make sure we can get at the rest. */
1007 if (!pskb_may_pull(skb
, skb
->len
))
1010 b
= (struct bootp_pkt
*)skb_network_header(skb
);
1013 /* One reply at a time, please. */
1014 spin_lock(&ic_recv_lock
);
1016 /* If we already have a reply, just drop the packet */
1020 /* Find the ic_device that the packet arrived on */
1022 while (d
&& d
->dev
!= dev
)
1025 goto drop_unlock
; /* should never happen */
1027 /* Is it a reply to our BOOTP request? */
1028 if (b
->op
!= BOOTP_REPLY
||
1030 net_err_ratelimited("DHCP/BOOTP: Reply not for us, op[%x] xid[%x]\n",
1035 /* Is it a reply for the device we are configuring? */
1036 if (b
->xid
!= ic_dev_xid
) {
1037 net_err_ratelimited("DHCP/BOOTP: Ignoring delayed packet\n");
1041 /* Parse extensions */
1043 !memcmp(b
->exten
, ic_bootp_cookie
, 4)) { /* Check magic cookie */
1044 u8
*end
= (u8
*) b
+ ntohs(b
->iph
.tot_len
);
1047 #ifdef IPCONFIG_DHCP
1048 if (ic_proto_enabled
& IC_USE_DHCP
) {
1049 __be32 server_id
= NONE
;
1053 while (ext
< end
&& *ext
!= 0xff) {
1055 if (*opt
== 0) /* Padding */
1061 case 53: /* Message type */
1065 case 54: /* Server ID (IP address) */
1067 memcpy(&server_id
, opt
+ 2, 4);
1072 pr_debug("DHCP: Got message type %d\n", mt
);
1076 /* While in the process of accepting one offer,
1077 * ignore all others.
1079 if (ic_myaddr
!= NONE
)
1082 /* Let's accept that offer. */
1083 ic_myaddr
= b
->your_ip
;
1084 ic_servaddr
= server_id
;
1085 pr_debug("DHCP: Offered address %pI4 by server %pI4\n",
1086 &ic_myaddr
, &b
->iph
.saddr
);
1087 /* The DHCP indicated server address takes
1088 * precedence over the bootp header one if
1089 * they are different.
1091 if ((server_id
!= NONE
) &&
1092 (b
->server_ip
!= server_id
))
1093 b
->server_ip
= ic_servaddr
;
1097 if (memcmp(dev
->dev_addr
, b
->hw_addr
, dev
->addr_len
) != 0)
1104 /* Urque. Forget it*/
1110 ic_dhcp_msgtype
= mt
;
1113 #endif /* IPCONFIG_DHCP */
1116 while (ext
< end
&& *ext
!= 0xff) {
1118 if (*opt
== 0) /* Padding */
1122 ic_do_bootp_ext(opt
);
1126 /* We have a winner! */
1128 ic_myaddr
= b
->your_ip
;
1129 ic_servaddr
= b
->server_ip
;
1130 ic_addrservaddr
= b
->iph
.saddr
;
1131 if (ic_gateway
== NONE
&& b
->relay_ip
)
1132 ic_gateway
= b
->relay_ip
;
1133 if (ic_nameservers
[0] == NONE
)
1134 ic_nameservers
[0] = ic_servaddr
;
1135 ic_got_reply
= IC_BOOTP
;
1138 /* Show's over. Nothing to see here. */
1139 spin_unlock(&ic_recv_lock
);
1142 /* Throw the packet out. */
1153 * Dynamic IP configuration -- DHCP, BOOTP, RARP.
1156 #ifdef IPCONFIG_DYNAMIC
1158 static int __init
ic_dynamic(void)
1161 struct ic_device
*d
;
1162 unsigned long start_jiffies
, timeout
, jiff
;
1163 int do_bootp
= ic_proto_have_if
& IC_BOOTP
;
1164 int do_rarp
= ic_proto_have_if
& IC_RARP
;
1167 * If none of DHCP/BOOTP/RARP was selected, return with an error.
1168 * This routine gets only called when some pieces of information
1169 * are missing, and without DHCP/BOOTP/RARP we are unable to get it.
1171 if (!ic_proto_enabled
) {
1172 pr_err("IP-Config: Incomplete network configuration information\n");
1176 #ifdef IPCONFIG_BOOTP
1177 if ((ic_proto_enabled
^ ic_proto_have_if
) & IC_BOOTP
)
1178 pr_err("DHCP/BOOTP: No suitable device found\n");
1180 #ifdef IPCONFIG_RARP
1181 if ((ic_proto_enabled
^ ic_proto_have_if
) & IC_RARP
)
1182 pr_err("RARP: No suitable device found\n");
1185 if (!ic_proto_have_if
)
1186 /* Error message already printed */
1192 #ifdef IPCONFIG_BOOTP
1196 #ifdef IPCONFIG_RARP
1202 * Send requests and wait, until we get an answer. This loop
1203 * seems to be a terrible waste of CPU time, but actually there is
1204 * only one process running at all, so we don't need to use any
1205 * scheduler functions.
1206 * [Actually we could now, but the nothing else running note still
1209 pr_notice("Sending %s%s%s requests .",
1211 ? ((ic_proto_enabled
& IC_USE_DHCP
) ? "DHCP" : "BOOTP") : "",
1212 (do_bootp
&& do_rarp
) ? " and " : "",
1213 do_rarp
? "RARP" : "");
1215 start_jiffies
= jiffies
;
1217 retries
= CONF_SEND_RETRIES
;
1218 get_random_bytes(&timeout
, sizeof(timeout
));
1219 timeout
= CONF_BASE_TIMEOUT
+ (timeout
% (unsigned int) CONF_TIMEOUT_RANDOM
);
1221 #ifdef IPCONFIG_BOOTP
1222 /* Track the device we are configuring */
1223 ic_dev_xid
= d
->xid
;
1225 if (do_bootp
&& (d
->able
& IC_BOOTP
))
1226 ic_bootp_send_if(d
, jiffies
- start_jiffies
);
1228 #ifdef IPCONFIG_RARP
1229 if (do_rarp
&& (d
->able
& IC_RARP
))
1233 jiff
= jiffies
+ (d
->next
? CONF_INTER_TIMEOUT
: timeout
);
1234 while (time_before(jiffies
, jiff
) && !ic_got_reply
)
1235 schedule_timeout_uninterruptible(1);
1236 #ifdef IPCONFIG_DHCP
1237 /* DHCP isn't done until we get a DHCPACK. */
1238 if ((ic_got_reply
& IC_BOOTP
) &&
1239 (ic_proto_enabled
& IC_USE_DHCP
) &&
1240 ic_dhcp_msgtype
!= DHCPACK
) {
1245 #endif /* IPCONFIG_DHCP */
1256 pr_cont(" timed out!\n");
1262 timeout
= timeout CONF_TIMEOUT_MULT
;
1263 if (timeout
> CONF_TIMEOUT_MAX
)
1264 timeout
= CONF_TIMEOUT_MAX
;
1269 #ifdef IPCONFIG_BOOTP
1273 #ifdef IPCONFIG_RARP
1278 if (!ic_got_reply
) {
1283 pr_info("IP-Config: Got %s answer from %pI4, my address is %pI4\n",
1284 ((ic_got_reply
& IC_RARP
) ? "RARP"
1285 : (ic_proto_enabled
& IC_USE_DHCP
) ? "DHCP" : "BOOTP"),
1286 &ic_addrservaddr
, &ic_myaddr
);
1291 #endif /* IPCONFIG_DYNAMIC */
1293 #ifdef CONFIG_PROC_FS
1295 static int pnp_seq_show(struct seq_file
*seq
, void *v
)
1299 if (ic_proto_used
& IC_PROTO
)
1300 seq_printf(seq
, "#PROTO: %s\n",
1301 (ic_proto_used
& IC_RARP
) ? "RARP"
1302 : (ic_proto_used
& IC_USE_DHCP
) ? "DHCP" : "BOOTP");
1304 seq_puts(seq
, "#MANUAL\n");
1308 "domain %s\n", ic_domain
);
1309 for (i
= 0; i
< CONF_NAMESERVERS_MAX
; i
++) {
1310 if (ic_nameservers
[i
] != NONE
)
1311 seq_printf(seq
, "nameserver %pI4\n",
1312 &ic_nameservers
[i
]);
1314 if (ic_servaddr
!= NONE
)
1315 seq_printf(seq
, "bootserver %pI4\n",
1320 static int pnp_seq_open(struct inode
*indoe
, struct file
*file
)
1322 return single_open(file
, pnp_seq_show
, NULL
);
1325 static const struct file_operations pnp_seq_fops
= {
1326 .owner
= THIS_MODULE
,
1327 .open
= pnp_seq_open
,
1329 .llseek
= seq_lseek
,
1330 .release
= single_release
,
1332 #endif /* CONFIG_PROC_FS */
1335 * Extract IP address from the parameter string if needed. Note that we
1336 * need to have root_server_addr set _before_ IPConfig gets called as it
1339 __be32 __init
root_nfs_parse_addr(char *name
)
1346 while (octets
< 4) {
1347 while (*cp
>= '0' && *cp
<= '9')
1349 if (cp
== cq
|| cp
- cq
> 3)
1351 if (*cp
== '.' || octets
== 3)
1357 if (octets
== 4 && (*cp
== ':' || *cp
== '\0')) {
1360 addr
= in_aton(name
);
1361 memmove(name
, cp
, strlen(cp
) + 1);
1368 #define DEVICE_WAIT_MAX 12 /* 12 seconds */
1370 static int __init
wait_for_devices(void)
1374 for (i
= 0; i
< DEVICE_WAIT_MAX
; i
++) {
1375 struct net_device
*dev
;
1379 for_each_netdev(&init_net
, dev
) {
1380 if (ic_is_init_dev(dev
)) {
1394 * IP Autoconfig dispatcher.
1397 static int __init
ip_auto_config(void)
1400 #ifdef IPCONFIG_DYNAMIC
1401 int retries
= CONF_OPEN_RETRIES
;
1406 #ifdef CONFIG_PROC_FS
1407 proc_create("pnp", S_IRUGO
, init_net
.proc_net
, &pnp_seq_fops
);
1408 #endif /* CONFIG_PROC_FS */
1413 pr_debug("IP-Config: Entered.\n");
1414 #ifdef IPCONFIG_DYNAMIC
1417 /* Wait for devices to appear */
1418 err
= wait_for_devices();
1422 /* Setup all network devices */
1423 err
= ic_open_devs();
1427 /* Give drivers a chance to settle */
1428 msleep(CONF_POST_OPEN
);
1431 * If the config information is insufficient (e.g., our IP address or
1432 * IP address of the boot server is missing or we have multiple network
1433 * interfaces and no default was set), use BOOTP or RARP to get the
1436 if (ic_myaddr
== NONE
||
1437 #ifdef CONFIG_ROOT_NFS
1438 (root_server_addr
== NONE
&&
1439 ic_servaddr
== NONE
&&
1440 ROOT_DEV
== Root_NFS
) ||
1442 ic_first_dev
->next
) {
1443 #ifdef IPCONFIG_DYNAMIC
1444 if (ic_dynamic() < 0) {
1448 * I don't know why, but sometimes the
1449 * eepro100 driver (at least) gets upset and
1450 * doesn't work the first time it's opened.
1451 * But then if you close it and reopen it, it
1452 * works just fine. So we need to try that at
1453 * least once before giving up.
1455 * Also, if the root will be NFS-mounted, we
1456 * have nowhere to go if DHCP fails. So we
1457 * just have to keep trying forever.
1461 #ifdef CONFIG_ROOT_NFS
1462 if (ROOT_DEV
== Root_NFS
) {
1463 pr_err("IP-Config: Retrying forever (NFS root)...\n");
1469 pr_err("IP-Config: Reopening network devices...\n");
1473 /* Oh, well. At least we tried. */
1474 pr_err("IP-Config: Auto-configuration of network failed\n");
1477 #else /* !DYNAMIC */
1478 pr_err("IP-Config: Incomplete network configuration information\n");
1481 #endif /* IPCONFIG_DYNAMIC */
1483 /* Device selected manually or only one device -> use it */
1484 ic_dev
= ic_first_dev
->dev
;
1487 addr
= root_nfs_parse_addr(root_server_path
);
1488 if (root_server_addr
== NONE
)
1489 root_server_addr
= addr
;
1492 * Use defaults wherever applicable.
1494 if (ic_defaults() < 0)
1498 * Close all network devices except the device we've
1499 * autoconfigured and set up routes.
1502 if (ic_setup_if() < 0 || ic_setup_routes() < 0)
1506 * Record which protocol was actually used.
1508 #ifdef IPCONFIG_DYNAMIC
1509 ic_proto_used
= ic_got_reply
| (ic_proto_enabled
& IC_USE_DHCP
);
1512 #ifndef IPCONFIG_SILENT
1514 * Clue in the operator.
1516 pr_info("IP-Config: Complete:\n");
1518 pr_info(" device=%s, hwaddr=%*phC, ipaddr=%pI4, mask=%pI4, gw=%pI4\n",
1519 ic_dev
->name
, ic_dev
->addr_len
, ic_dev
->dev_addr
,
1520 &ic_myaddr
, &ic_netmask
, &ic_gateway
);
1521 pr_info(" host=%s, domain=%s, nis-domain=%s\n",
1522 utsname()->nodename
, ic_domain
, utsname()->domainname
);
1523 pr_info(" bootserver=%pI4, rootserver=%pI4, rootpath=%s",
1524 &ic_servaddr
, &root_server_addr
, root_server_path
);
1526 pr_cont(", mtu=%d", ic_dev_mtu
);
1527 for (i
= 0; i
< CONF_NAMESERVERS_MAX
; i
++)
1528 if (ic_nameservers
[i
] != NONE
) {
1529 pr_cont(" nameserver%u=%pI4",
1530 i
, &ic_nameservers
[i
]);
1533 for (i
++; i
< CONF_NAMESERVERS_MAX
; i
++)
1534 if (ic_nameservers
[i
] != NONE
)
1535 pr_cont(", nameserver%u=%pI4", i
, &ic_nameservers
[i
]);
1537 #endif /* !SILENT */
1542 late_initcall(ip_auto_config
);
1546 * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
1547 * command line parameter. See Documentation/filesystems/nfs/nfsroot.txt.
1549 static int __init
ic_proto_name(char *name
)
1551 if (!strcmp(name
, "on") || !strcmp(name
, "any")) {
1554 if (!strcmp(name
, "off") || !strcmp(name
, "none")) {
1557 #ifdef CONFIG_IP_PNP_DHCP
1558 else if (!strncmp(name
, "dhcp", 4)) {
1561 ic_proto_enabled
&= ~IC_RARP
;
1562 client_id
= strstr(name
, "dhcp,");
1566 client_id
= client_id
+ 5;
1567 v
= strchr(client_id
, ',');
1571 if (kstrtou8(client_id
, 0, dhcp_client_identifier
))
1572 pr_debug("DHCP: Invalid client identifier type\n");
1573 strncpy(dhcp_client_identifier
+ 1, v
+ 1, 251);
1579 #ifdef CONFIG_IP_PNP_BOOTP
1580 else if (!strcmp(name
, "bootp")) {
1581 ic_proto_enabled
&= ~(IC_RARP
| IC_USE_DHCP
);
1585 #ifdef CONFIG_IP_PNP_RARP
1586 else if (!strcmp(name
, "rarp")) {
1587 ic_proto_enabled
&= ~(IC_BOOTP
| IC_USE_DHCP
);
1591 #ifdef IPCONFIG_DYNAMIC
1592 else if (!strcmp(name
, "both")) {
1593 ic_proto_enabled
&= ~IC_USE_DHCP
; /* backward compat :-( */
1600 static int __init
ip_auto_config_setup(char *addrs
)
1605 ic_set_manually
= 1;
1609 * If any dhcp, bootp etc options are set, leave autoconfig on
1610 * and skip the below static IP processing.
1612 if (ic_proto_name(addrs
))
1615 /* If no static IP is given, turn off autoconfig and bail. */
1617 strcmp(addrs
, "off") == 0 ||
1618 strcmp(addrs
, "none") == 0) {
1623 ic_nameservers_predef();
1625 /* Parse string for static IP assignment. */
1628 if ((cp
= strchr(ip
, ':')))
1630 if (strlen(ip
) > 0) {
1631 pr_debug("IP-Config: Parameter #%d: `%s'\n", num
, ip
);
1634 if ((ic_myaddr
= in_aton(ip
)) == ANY
)
1638 if ((ic_servaddr
= in_aton(ip
)) == ANY
)
1642 if ((ic_gateway
= in_aton(ip
)) == ANY
)
1646 if ((ic_netmask
= in_aton(ip
)) == ANY
)
1650 if ((dp
= strchr(ip
, '.'))) {
1652 strlcpy(utsname()->domainname
, dp
,
1653 sizeof(utsname()->domainname
));
1655 strlcpy(utsname()->nodename
, ip
,
1656 sizeof(utsname()->nodename
));
1657 ic_host_name_set
= 1;
1660 strlcpy(user_dev_name
, ip
, sizeof(user_dev_name
));
1663 if (ic_proto_name(ip
) == 0 &&
1664 ic_myaddr
== NONE
) {
1669 if (CONF_NAMESERVERS_MAX
>= 1) {
1670 ic_nameservers
[0] = in_aton(ip
);
1671 if (ic_nameservers
[0] == ANY
)
1672 ic_nameservers
[0] = NONE
;
1676 if (CONF_NAMESERVERS_MAX
>= 2) {
1677 ic_nameservers
[1] = in_aton(ip
);
1678 if (ic_nameservers
[1] == ANY
)
1679 ic_nameservers
[1] = NONE
;
1690 __setup("ip=", ip_auto_config_setup
);
1692 static int __init
nfsaddrs_config_setup(char *addrs
)
1694 return ip_auto_config_setup(addrs
);
1696 __setup("nfsaddrs=", nfsaddrs_config_setup
);
1698 static int __init
vendor_class_identifier_setup(char *addrs
)
1700 if (strlcpy(vendor_class_identifier
, addrs
,
1701 sizeof(vendor_class_identifier
))
1702 >= sizeof(vendor_class_identifier
))
1703 pr_warn("DHCP: vendorclass too long, truncated to \"%s\"\n",
1704 vendor_class_identifier
);
1707 __setup("dhcpclass=", vendor_class_identifier_setup
);