/*
* linux/fs/nfs/nfsroot.c -- version 2.3
*
* Copyright (C) 1995, 1996 Gero Kuhlmann <gero@gkminix.han.de>
*
* For parts of this file:
* Copyright (C) 1996 Martin Mares <mj@k332.feld.cvut.cz>
*
* Allow an NFS filesystem to be mounted as root. The way this works is:
* (1) Determine the local IP address via RARP or BOOTP or from the
* kernel command line.
* (2) Handle RPC negotiation with the system which replied to RARP or
* was reported as a boot server by BOOTP or manually.
* (3) The actual mounting is done later, when init() is running.
*
*
* Changes:
*
* Alan Cox : Removed get_address name clash with FPU.
* Alan Cox : Reformatted a bit.
* Gero Kuhlmann : Code cleanup
* Michael Rausch : Fixed recognition of an incoming RARP answer.
* Martin Mares : (2.0) Auto-configuration via BOOTP supported.
* Martin Mares : Manual selection of interface & BOOTP/RARP.
* Martin Mares : Using network routes instead of host routes,
* allowing the default configuration to be used
* for normal operation of the host.
* Martin Mares : Randomized timer with exponential backoff
* installed to minimize network congestion.
* Martin Mares : Code cleanup.
* Martin Mares : (2.1) BOOTP and RARP made configuration options.
* Martin Mares : Server hostname generation fixed.
* Gerd Knorr : Fixed wired inode handling
* Martin Mares : (2.2) "0.0.0.0" addresses from command line ignored.
* Martin Mares : RARP replies not tested for server address.
* Gero Kuhlmann : (2.3) Some bug fixes and code cleanup again (please
* send me your new patches _before_ bothering
* Linus so that I don' always have to cleanup
* _afterwards_ - thanks)
* Gero Kuhlmann : Last changes of Martin Mares undone.
* Gero Kuhlmann : RARP replies are tested for specified server
* again. However, it's now possible to have
* different RARP and NFS servers.
* Gero Kuhlmann : "0.0.0.0" addresses from command line are
* now mapped to INADDR_NONE.
* Gero Kuhlmann : Fixed a bug which prevented BOOTP path name
* from being used (thanks to Leo Spiekman)
* Andy Walker : Allow to specify the NFS server in nfs_root
* without giving a path name
* Swen Th=FCmmler : Allow to specify the NFS options in nfs_root
* without giving a path name. Fix BOOTP request
* for domainname (domainname is NIS domain, not
* DNS domain!). Skip dummy devices for BOOTP.
* Jacek Zapala : Fixed a bug which prevented server-ip address
* from nfsroot parameter from being used.
*
*/
/* Define this to allow debugging output */
#undef NFSROOT_DEBUG
#undef NFSROOT_BOOTP_DEBUG
#include <linux/config.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/fs.h>
#include <linux/random.h>
#include <linux/fcntl.h>
#include <asm/param.h>
#include <linux/utsname.h>
#include <linux/in.h>
#include <linux/if.h>
#include <linux/inet.h>
#include <linux/net.h>
#include <linux/netdevice.h>
#include <linux/if_arp.h>
#ifdef CONFIG_AX25
#include <net/ax25.h> /* For AX25_P_IP */
#endif
#include <linux/skbuff.h>
#include <linux/socket.h>
#include <linux/route.h>
#include <linux/nfs.h>
#include <linux/nfs_fs.h>
#include <linux/nfs_mount.h>
#include <linux/in.h>
#include <net/route.h>
#include <net/sock.h>
#include <asm/segment.h>
/* Range of privileged ports */
#define STARTPORT 600
#define ENDPORT 1023
#define NPORTS (ENDPORT - STARTPORT + 1)
/* Define the timeout for waiting for a RARP/BOOTP reply */
#define CONF_BASE_TIMEOUT (HZ*5) /* Initial timeout: 5 seconds */
#define CONF_RETRIES 10 /* 10 retries */
#define CONF_TIMEOUT_RANDOM (HZ) /* Maximum amount of randomization */
#define CONF_TIMEOUT_MULT *5/4 /* Speed of timeout growth */
#define CONF_TIMEOUT_MAX (HZ*30) /* Maximum allowed timeout */
/* List of open devices */
struct open_dev {
struct device *dev;
unsigned short old_flags;
struct open_dev *next;
};
static struct open_dev *open_base = NULL;
/* IP configuration */
static struct device *root_dev = NULL; /* Device selected for booting */
static char user_dev_name[IFNAMSIZ]; /* Name of user-selected boot device */
static struct sockaddr_in myaddr; /* My IP address */
static struct sockaddr_in server; /* Server IP address */
static struct sockaddr_in gateway; /* Gateway IP address */
static struct sockaddr_in netmask; /* Netmask for local subnet */
/* BOOTP/RARP variables */
static int bootp_flag; /* User said: Use BOOTP! */
static int rarp_flag; /* User said: Use RARP! */
static int bootp_dev_count = 0; /* Number of devices allowing BOOTP */
static int rarp_dev_count = 0; /* Number of devices allowing RARP */
static struct sockaddr_in rarp_serv; /* IP address of RARP server */
#if defined(CONFIG_RNFS_BOOTP) || defined(CONFIG_RNFS_RARP)
#define CONFIG_RNFS_DYNAMIC /* Enable dynamic IP config */
static volatile int pkt_arrived; /* BOOTP/RARP packet detected */
#define ARRIVED_BOOTP 1
#define ARRIVED_RARP 2
#endif
/* NFS-related data */
static struct nfs_mount_data nfs_data; /* NFS mount info */
static char nfs_path[NFS_MAXPATHLEN] = ""; /* Name of directory to mount */
static int nfs_port; /* Port to connect to for NFS */
/* Yes, we use sys_socket, but there's no include file for it */
extern asmlinkage int sys_socket(int family, int type, int protocol);
/***************************************************************************
Device Handling Subroutines
***************************************************************************/
/*
* Setup and initialize all network devices. If there is a user-preferred
* interface, ignore all other interfaces.
*/
static int root_dev_open(void)
{
struct open_dev *openp, **last;
struct device *dev;
unsigned short old_flags;
last = &open_base;
for (dev = dev_base; dev != NULL; dev = dev->next) {
if (dev->type < ARPHRD_SLIP &&
dev->family == AF_INET &&
!(dev->flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) &&
(0 != strncmp(dev->name, "dummy", 5)) &&
(!user_dev_name[0] || !strcmp(dev->name, user_dev_name))) {
/* First up the interface */
old_flags = dev->flags;
dev->flags = IFF_UP | IFF_BROADCAST | IFF_RUNNING;
if (!(old_flags & IFF_UP) && dev_open(dev)) {
dev->flags = old_flags;
continue;
}
openp = (struct open_dev *) kmalloc(sizeof(struct open_dev),
GFP_ATOMIC);
if (openp == NULL)
continue;
openp->dev = dev;
openp->old_flags = old_flags;
*last = openp;
last = &openp->next;
bootp_dev_count++;
if (!(dev->flags & IFF_NOARP))
rarp_dev_count++;
#ifdef NFSROOT_DEBUG
printk(KERN_NOTICE "Root-NFS: Opened %s\n", dev->name);
#endif
}
}
*last = NULL;
if (!bootp_dev_count && !rarp_dev_count) {
printk(KERN_ERR "Root-NFS: Unable to open at least one network device\n");
return -1;
}
return 0;
}
/*
* Restore the state of all devices. However, keep the root device open
* for the upcoming mount.
*/
static void root_dev_close(void)
{
struct open_dev *openp;
struct open_dev *nextp;
openp = open_base;
while (openp != NULL) {
nextp = openp->next;
openp->next = NULL;
if (openp->dev != root_dev) {
if (!(openp->old_flags & IFF_UP))
dev_close(openp->dev);
openp->dev->flags = openp->old_flags;
}
kfree_s(openp, sizeof(struct open_dev));
openp = nextp;
}
}
/***************************************************************************
RARP Subroutines
***************************************************************************/
#ifdef CONFIG_RNFS_RARP
extern void arp_send(int type, int ptype, unsigned long target_ip,
struct device *dev, unsigned long src_ip,
unsigned char *dest_hw, unsigned char *src_hw,
unsigned char *target_hw);
static int root_rarp_recv(struct sk_buff *skb, struct device *dev,
struct packet_type *pt);
static struct packet_type rarp_packet_type = {
0, /* Should be: __constant_htons(ETH_P_RARP)
* - but this _doesn't_ come out constant! */
NULL, /* Listen to all devices */
root_rarp_recv,
NULL,
NULL
};
/*
* Register the packet type for RARP
*/
static void root_rarp_open(void)
{
rarp_packet_type.type = htons(ETH_P_RARP);
dev_add_pack(&rarp_packet_type);
}
/*
* Deregister the RARP packet type
*/
static void root_rarp_close(void)
{
rarp_packet_type.type = htons(ETH_P_RARP);
dev_remove_pack(&rarp_packet_type);
}
/*
* Receive RARP packets.
*/
static int root_rarp_recv(struct sk_buff *skb, struct device *dev, struct packet_type *pt)
{
struct arphdr *rarp = (struct arphdr *)skb->h.raw;
unsigned char *rarp_ptr = (unsigned char *) (rarp + 1);
unsigned long sip, tip;
unsigned char *sha, *tha; /* s for "source", t for "target" */
/* If this test doesn't pass, it's not IP, or we should ignore it anyway */
if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd)) {
kfree_skb(skb, FREE_READ);
return 0;
}
/* If it's not a RARP reply, delete it. */
if (rarp->ar_op != htons(ARPOP_RREPLY)) {
kfree_skb(skb, FREE_READ);
return 0;
}
/* If it's not ethernet or AX25, delete it. */
if ((rarp->ar_pro != htons(ETH_P_IP) && dev->type != ARPHRD_AX25) ||
#ifdef CONFIG_AX25
(rarp->ar_pro != htons(AX25_P_IP) && dev->type == ARPHRD_AX25) ||
#endif
rarp->ar_pln != 4) {
kfree_skb(skb, FREE_READ);
return 0;
}
/* Extract variable width fields */
sha = rarp_ptr;
rarp_ptr += dev->addr_len;
memcpy(&sip, rarp_ptr, 4);
rarp_ptr += 4;
tha = rarp_ptr;
rarp_ptr += dev->addr_len;
memcpy(&tip, rarp_ptr, 4);
/* Discard packets which are not meant for us. */
if (memcmp(tha, dev->dev_addr, dev->addr_len)) {
kfree_skb(skb, FREE_READ);
return 0;
}
/* Discard packets which are not from specified server. */
if (rarp_flag && !bootp_flag &&
rarp_serv.sin_addr.s_addr != INADDR_NONE &&
rarp_serv.sin_addr.s_addr != sip) {
kfree_skb(skb, FREE_READ);
return 0;
}
/*
* The packet is what we were looking for. Setup the global
* variables.
*/
cli();
if (pkt_arrived) {
sti();
kfree_skb(skb, FREE_READ);
return 0;
}
pkt_arrived = ARRIVED_RARP;
sti();
root_dev = dev;
if (myaddr.sin_addr.s_addr == INADDR_NONE) {
myaddr.sin_family = dev->family;
myaddr.sin_addr.s_addr = tip;
}
if (server.sin_addr.s_addr == INADDR_NONE) {
server.sin_family = dev->family;
server.sin_addr.s_addr = sip;
}
kfree_skb(skb, FREE_READ);
return 0;
}
/*
* Send RARP request packet over all devices which allow RARP.
*/
static void root_rarp_send(void)
{
struct open_dev *openp;
struct device *dev;
int num = 0;
for (openp = open_base; openp != NULL; openp = openp->next) {
dev = openp->dev;
if (!(dev->flags & IFF_NOARP)) {
arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL,
dev->dev_addr, dev->dev_addr);
num++;
}
}
}
#endif
/***************************************************************************
BOOTP Subroutines
***************************************************************************/
#ifdef CONFIG_RNFS_BOOTP
static struct device *bootp_dev = NULL; /* Device selected as best BOOTP target */
static int bootp_xmit_fd = -1; /* Socket descriptor for transmit */
static struct socket *bootp_xmit_sock; /* The socket itself */
static int bootp_recv_fd = -1; /* Socket descriptor for receive */
static struct socket *bootp_recv_sock; /* The socket itself */
struct bootp_pkt { /* BOOTP packet format */
u8 op; /* 1=request, 2=reply */
u8 htype; /* HW address type */
u8 hlen; /* HW address length */
u8 hops; /* Used only by gateways */
u32 xid; /* Transaction ID */
u16 secs; /* Seconds since we started */
u16 flags; /* Just what is says */
u32 client_ip; /* Client's IP address if known */
u32 your_ip; /* Assigned IP address */
u32 server_ip; /* Server's IP address */
u32 relay_ip; /* IP address of BOOTP relay */
u8 hw_addr[16]; /* Client's HW address */
u8 serv_name[64]; /* Server host name */
u8 boot_file[128]; /* Name of boot file */
u8 vendor_area[128]; /* Area for extensions */
};
#define BOOTP_REQUEST 1
#define BOOTP_REPLY 2
static struct bootp_pkt *xmit_bootp; /* Packet being transmitted */
static struct bootp_pkt *recv_bootp; /* Packet being received */
static int bootp_have_route = 0; /* BOOTP route installed */
/*
* Free BOOTP packet buffers
*/
static void root_free_bootp(void)
{
if (xmit_bootp) {
kfree_s(xmit_bootp, sizeof(struct bootp_pkt));
xmit_bootp = NULL;
}
if (recv_bootp) {
kfree_s(recv_bootp, sizeof(struct bootp_pkt));
recv_bootp = NULL;
}
}
/*
* Allocate memory for BOOTP packet buffers
*/
static inline int root_alloc_bootp(void)
{
if (!(xmit_bootp = kmalloc(sizeof(struct bootp_pkt), GFP_KERNEL)) ||
!(recv_bootp = kmalloc(sizeof(struct bootp_pkt), GFP_KERNEL))) {
printk("BOOTP: Out of memory!");
return -1;
}
return 0;
}
/*
* Create default route for BOOTP sending
*/
static int root_add_bootp_route(void)
{
struct rtentry route;
memset(&route, 0, sizeof(route));
route.rt_dev = bootp_dev->name;
route.rt_mss = bootp_dev->mtu;
route.rt_flags = RTF_UP;
((struct sockaddr_in *) &(route.rt_dst)) -> sin_addr.s_addr = 0;
((struct sockaddr_in *) &(route.rt_dst)) -> sin_family = AF_INET;
((struct sockaddr_in *) &(route.rt_genmask)) -> sin_addr.s_addr = 0;
((struct sockaddr_in *) &(route.rt_genmask)) -> sin_family = AF_INET;
if (ip_rt_new(&route)) {
printk(KERN_ERR "BOOTP: Adding of route failed!\n");
return -1;
}
bootp_have_route = 1;
return 0;
}
/*
* Delete default route for BOOTP sending
*/
static int root_del_bootp_route(void)
{
struct rtentry route;
if (!bootp_have_route)
return 0;
memset(&route, 0, sizeof(route));
((struct sockaddr_in *) &(route.rt_dst)) -> sin_addr.s_addr = 0;
((struct sockaddr_in *) &(route.rt_genmask)) -> sin_addr.s_addr = 0;
if (ip_rt_kill(&route)) {
printk(KERN_ERR "BOOTP: Deleting of route failed!\n");
return -1;
}
bootp_have_route = 0;
return 0;
}
/*
* Open UDP socket.
*/
static int root_open_udp_sock(int *fd, struct socket **sock)
{
struct file *file;
struct inode *inode;
*fd = sys_socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if (*fd >= 0) {
file = current->files->fd[*fd];
inode = file->f_inode;
*sock = &inode->u.socket_i;
return 0;
}
printk(KERN_ERR "BOOTP: Cannot open UDP socket!\n");
return -1;
}
/*
* Connect UDP socket.
*/
static int root_connect_udp_sock(struct socket *sock, u32 addr, u16 port)
{
struct sockaddr_in sa;
int result;
sa.sin_family = AF_INET;
sa.sin_addr.s_addr = htonl(addr);
sa.sin_port = htons(port);
result = sock->ops->connect(sock, (struct sockaddr *) &sa, sizeof(sa), 0);
if (result < 0) {
printk(KERN_ERR "BOOTP: connect() failed\n");
return -1;
}
return 0;
}
/*
* Bind UDP socket.
*/
static int root_bind_udp_sock(struct socket *sock, u32 addr, u16 port)
{
struct sockaddr_in sa;
int result;
sa.sin_family = AF_INET;
sa.sin_addr.s_addr = htonl(addr);
sa.sin_port = htons(port);
result = sock->ops->bind(sock, (struct sockaddr *) &sa, sizeof(sa));
if (result < 0) {
printk(KERN_ERR "BOOTP: bind() failed\n");
return -1;
}
return 0;
}
/*
* Send UDP packet.
*/
static inline int root_send_udp(struct socket *sock, void *buf, int size)
{
u32 oldfs;
int result;
struct msghdr msg;
struct iovec iov;
oldfs = get_fs();
set_fs(get_ds());
iov.iov_base = buf;
iov.iov_len = size;
msg.msg_name = NULL;
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
msg.msg_control = NULL;
result = sock->ops->sendmsg(sock, &msg, size, 0, 0);
set_fs(oldfs);
return (result != size);
}
/*
* Try to receive UDP packet.
*/
static inline int root_recv_udp(struct socket *sock, void *buf, int size)
{
u32 oldfs;
int result;
struct msghdr msg;
struct iovec iov;
oldfs = get_fs();
set_fs(get_ds());
iov.iov_base = buf;
iov.iov_len = size;
msg.msg_name = NULL;
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
msg.msg_control = NULL;
msg.msg_namelen = 0;
result = sock->ops->recvmsg(sock, &msg, size, O_NONBLOCK, 0, &msg.msg_namelen);
set_fs(oldfs);
return result;
}
/*
* Initialize BOOTP extension fields in the request.
*/
static void root_bootp_init_ext(u8 *e)
{
*e++ = 99; /* RFC1048 Magic Cookie */
*e++ = 130;
*e++ = 83;
*e++ = 99;
*e++ = 1; /* Subnet mask request */
*e++ = 4;
e += 4;
*e++ = 3; /* Default gateway request */
*e++ = 4;
e += 4;
*e++ = 12; /* Host name request */
*e++ = 32;
e += 32;
*e++ = 40; /* NIS Domain name request */
*e++ = 32;
e += 32;
*e++ = 17; /* Boot path */
*e++ = 32;
e += 32;
*e = 255; /* End of the list */
}
/*
* Deinitialize the BOOTP mechanism.
*/
static void root_bootp_close(void)
{
if (bootp_xmit_fd != -1)
sys_close(bootp_xmit_fd);
if (bootp_recv_fd != -1)
sys_close(bootp_recv_fd);
root_del_bootp_route();
root_free_bootp();
}
/*
* Initialize the BOOTP mechanism.
*/
static int root_bootp_open(void)
{
struct open_dev *openp;
struct device *dev, *best_dev;
/*
* Select the best interface for BOOTP. We try to select a first
* Ethernet-like interface. It's shame I know no simple way how to send
* BOOTP's to all interfaces, but it doesn't apply to usual diskless
* stations as they don't have multiple interfaces.
*/
best_dev = NULL;
for (openp = open_base; openp != NULL; openp = openp->next) {
dev = openp->dev;
if (dev->flags & IFF_BROADCAST) {
if (!best_dev ||
((best_dev->flags & IFF_NOARP) && !(dev->flags & IFF_NOARP)))
best_dev = dev;
}
}
if (!best_dev) {
printk(KERN_ERR "BOOTP: This cannot happen!\n");
return -1;
}
bootp_dev = best_dev;
/* Allocate memory for BOOTP packets */
if (root_alloc_bootp())
return -1;
/* Construct BOOTP request */
memset(xmit_bootp, 0, sizeof(struct bootp_pkt));
xmit_bootp->op = BOOTP_REQUEST;
get_random_bytes(&xmit_bootp->xid, sizeof(xmit_bootp->xid));
xmit_bootp->htype = best_dev->type;
xmit_bootp->hlen = best_dev->addr_len;
memcpy(xmit_bootp->hw_addr, best_dev->dev_addr, best_dev->addr_len);
root_bootp_init_ext(xmit_bootp->vendor_area);
#ifdef NFSROOT_BOOTP_DEBUG
{
int x;
printk(KERN_NOTICE "BOOTP: XID=%08x, DE=%s, HT=%02x, HL=%02x, HA=",
xmit_bootp->xid,
best_dev->name,
xmit_bootp->htype,
xmit_bootp->hlen);
for(x=0; x<xmit_bootp->hlen; x++)
printk("%02x", xmit_bootp->hw_addr[x]);
printk("\n");
}
#endif
/* Create default route to that interface */
if (root_add_bootp_route())
return -1;
/* Open the sockets */
if (root_open_udp_sock(&bootp_xmit_fd, &bootp_xmit_sock) ||
root_open_udp_sock(&bootp_recv_fd, &bootp_recv_sock))
return -1;
/* Bind/connect the sockets */
((struct sock *) bootp_xmit_sock->data) -> broadcast = 1;
((struct sock *) bootp_xmit_sock->data) -> reuse = 1;
((struct sock *) bootp_recv_sock->data) -> reuse = 1;
if (root_bind_udp_sock(bootp_recv_sock, INADDR_ANY, 68) ||
root_bind_udp_sock(bootp_xmit_sock, INADDR_ANY, 68) ||
root_connect_udp_sock(bootp_xmit_sock, INADDR_BROADCAST, 67))
return -1;
return 0;
}
/*
* Send BOOTP request.
*/
static int root_bootp_send(u32 jiffies)
{
xmit_bootp->secs = htons(jiffies / HZ);
return root_send_udp(bootp_xmit_sock, xmit_bootp, sizeof(struct bootp_pkt));
}
/*
* Copy BOOTP-supplied string if not already set.
*/
static int root_bootp_string(char *dest, char *src, int len, int max)
{
if (*dest || !len)
return 0;
if (len > max-1)
len = max-1;
strncpy(dest, src, len);
dest[len] = '\0';
return 1;
}
/*
* Process BOOTP extension.
*/
static void root_do_bootp_ext(u8 *ext)
{
#ifdef NFSROOT_BOOTP_DEBUG
u8 *c;
printk("BOOTP: Got extension %02x",*ext);
for(c=ext+2; c<ext+2+ext[1]; c++)
printk(" %02x", *c);
printk("\n");
#endif
switch (*ext++) {
case 1: /* Subnet mask */
if (netmask.sin_addr.s_addr == INADDR_NONE)
memcpy(&netmask.sin_addr.s_addr, ext+1, 4);
break;
case 3: /* Default gateway */
if (gateway.sin_addr.s_addr == INADDR_NONE)
memcpy(&gateway.sin_addr.s_addr, ext+1, 4);
break;
case 12: /* Host name */
root_bootp_string(system_utsname.nodename, ext+1, *ext, __NEW_UTS_LEN);
break;
case 40: /* NIS Domain name */
root_bootp_string(system_utsname.domainname, ext+1, *ext, __NEW_UTS_LEN);
break;
case 17: /* Root path */
root_bootp_string(nfs_path, ext+1, *ext, NFS_MAXPATHLEN);
break;
}
}
/*
* Receive BOOTP request.
*/
static void root_bootp_recv(void)
{
int len;
u8 *ext, *end, *opt;
len = root_recv_udp(bootp_recv_sock, recv_bootp, sizeof(struct bootp_pkt));
if (len < 0)
return;
/* Check consistency of incoming packet */
if (len < 300 || /* See RFC 1542:2.1 */
recv_bootp->op != BOOTP_REPLY ||
recv_bootp->htype != xmit_bootp->htype ||
recv_bootp->hlen != xmit_bootp->hlen ||
recv_bootp->xid != xmit_bootp->xid) {
#ifdef NFSROOT_BOOTP_DEBUG
printk("?");
#endif
return;
}
/* Record BOOTP packet arrival in the global variables */
cli();
if (pkt_arrived) {
sti();
return;
}
pkt_arrived = ARRIVED_BOOTP;
sti();
root_dev = bootp_dev;
/* Extract basic fields */
myaddr.sin_addr.s_addr = recv_bootp->your_ip;
if (server.sin_addr.s_addr==INADDR_NONE)
server.sin_addr.s_addr = recv_bootp->server_ip;
/* Parse extensions */
if (recv_bootp->vendor_area[0] == 99 && /* Check magic cookie */
recv_bootp->vendor_area[1] == 130 &&
recv_bootp->vendor_area[2] == 83 &&
recv_bootp->vendor_area[3] == 99) {
ext = &recv_bootp->vendor_area[4];
end = (u8 *) recv_bootp + len;
while (ext < end && *ext != 255) {
if (*ext == 0) /* Padding */
ext++;
else {
opt = ext;
ext += ext[1] + 2;
if (ext <= end)
root_do_bootp_ext(opt);
}
}
}
}
#endif
/***************************************************************************
Dynamic configuration of IP.
***************************************************************************/
#ifdef CONFIG_RNFS_DYNAMIC
/*
* Determine client and server IP numbers and appropriate device by using
* the RARP and BOOTP protocols.
*/
static int root_auto_config(void)
{
int retries;
unsigned long timeout, jiff;
unsigned long start_jiffies;
/*
* If neither BOOTP nor RARP was selected, return with an error. This
* routine gets only called when some pieces of information are mis-
* sing, and without BOOTP and RARP we are not able to get that in-
* formation.
*/
if (!bootp_flag && !rarp_flag) {
printk(KERN_ERR "Root-NFS: Neither RARP nor BOOTP selected.\n");
return -1;
}
#ifdef CONFIG_RNFS_BOOTP
if (bootp_flag && !bootp_dev_count) {
printk(KERN_ERR "Root-NFS: No suitable device for BOOTP found.\n");
bootp_flag = 0;
}
#else
bootp_flag = 0;
#endif
#ifdef CONFIG_RNFS_RARP
if (rarp_flag && !rarp_dev_count) {
printk(KERN_ERR "Root-NFS: No suitable device for RARP found.\n");
rarp_flag = 0;
}
#else
rarp_flag = 0;
#endif
if (!bootp_flag && !rarp_flag)
/* Error message already printed */
return -1;
/*
* Setup RARP and BOOTP protocols
*/
#ifdef CONFIG_RNFS_RARP
if (rarp_flag)
root_rarp_open();
#endif
#ifdef CONFIG_RNFS_BOOTP
if (bootp_flag && root_bootp_open() < 0) {
root_bootp_close();
return -1;
}
#endif
/*
* Send requests and wait, until we get an answer. This loop
* seems to be a terrible waste of CPU time, but actually there is
* only one process running at all, so we don't need to use any
* scheduler functions.
* [Actually we could now, but the nothing else running note still
* applies.. - AC]
*/
printk(KERN_NOTICE "Sending %s%s%s requests...",
bootp_flag ? "BOOTP" : "",
bootp_flag && rarp_flag ? " and " : "",
rarp_flag ? "RARP" : "");
start_jiffies = jiffies;
retries = CONF_RETRIES;
get_random_bytes(&timeout, sizeof(timeout));
timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned) CONF_TIMEOUT_RANDOM);
for(;;) {
#ifdef CONFIG_RNFS_BOOTP
if (bootp_flag && root_bootp_send(jiffies - start_jiffies) < 0) {
printk(" BOOTP failed!\n");
root_bootp_close();
bootp_flag = 0;
if (!rarp_flag)
break;
}
#endif
#ifdef CONFIG_RNFS_RARP
if (rarp_flag)
root_rarp_send();
#endif
printk(".");
jiff = jiffies + timeout;
while (jiffies < jiff && !pkt_arrived)
#ifdef CONFIG_RNFS_BOOTP
root_bootp_recv();
#else
;
#endif
if (pkt_arrived)
break;
if (! --retries) {
printk(" timed out!\n");
break;
}
timeout = timeout CONF_TIMEOUT_MULT;
if (timeout > CONF_TIMEOUT_MAX)
timeout = CONF_TIMEOUT_MAX;
}
#ifdef CONFIG_RNFS_RARP
if (rarp_flag)
root_rarp_close();
#endif
#ifdef CONFIG_RNFS_BOOTP
if (bootp_flag)
root_bootp_close();
#endif
if (!pkt_arrived)
return -1;
printk(" OK\n");
printk(KERN_NOTICE "Root-NFS: Got %s answer from %s, ",
(pkt_arrived == ARRIVED_BOOTP) ? "BOOTP" : "RARP",
in_ntoa(server.sin_addr.s_addr));
printk("my address is %s\n", in_ntoa(myaddr.sin_addr.s_addr));
return 0;
}
#endif
/***************************************************************************
Parsing of options
***************************************************************************/
/*
* The following integer options are recognized
*/
static struct nfs_int_opts {
char *name;
int *val;
} root_int_opts[] = {
{ "port", &nfs_port },
{ "rsize", &nfs_data.rsize },
{ "wsize", &nfs_data.wsize },
{ "timeo", &nfs_data.timeo },
{ "retrans", &nfs_data.retrans },
{ "acregmin", &nfs_data.acregmin },
{ "acregmax", &nfs_data.acregmax },
{ "acdirmin", &nfs_data.acdirmin },
{ "acdirmax", &nfs_data.acdirmax },
{ NULL, NULL }
};
/*
* And now the flag options
*/
static struct nfs_bool_opts {
char *name;
int and_mask;
int or_mask;
} root_bool_opts[] = {
{ "soft", ~NFS_MOUNT_SOFT, NFS_MOUNT_SOFT },
{ "hard", ~NFS_MOUNT_SOFT, 0 },
{ "intr", ~NFS_MOUNT_INTR, NFS_MOUNT_INTR },
{ "nointr", ~NFS_MOUNT_INTR, 0 },
{ "posix", ~NFS_MOUNT_POSIX, NFS_MOUNT_POSIX },
{ "noposix", ~NFS_MOUNT_POSIX, 0 },
{ "cto", ~NFS_MOUNT_NOCTO, 0 },
{ "nocto", ~NFS_MOUNT_NOCTO, NFS_MOUNT_NOCTO },
{ "ac", ~NFS_MOUNT_NOAC, 0 },
{ "noac", ~NFS_MOUNT_NOAC, NFS_MOUNT_NOAC },
{ NULL, 0, 0 }
};
/*
* Prepare the NFS data structure and parse any options. This tries to
* set as many values in the nfs_data structure as known right now.
*/
static int root_nfs_name(char *name)
{
char buf[NFS_MAXPATHLEN];
char *cp, *cq, *options, *val;
int octets = 0;
/* It is possible to override the server IP number here */
cp = cq = name;
while (octets < 4) {
while (*cp >= '0' && *cp <= '9')
cp++;
if (cp == cq || cp - cq > 3)
break;
if (*cp == '.' || octets == 3)
octets++;
if (octets < 4)
cp++;
cq = cp;
}
if (octets == 4 && (*cp == ':' || *cp == '\0')) {
if (*cp == ':')
*cp++ = '\0';
server.sin_addr.s_addr = in_aton(name);
name = cp;
}
/* Clear the nfs_data structure and setup the server hostname */
memset(&nfs_data, 0, sizeof(nfs_data));
strncpy(nfs_data.hostname, in_ntoa(server.sin_addr.s_addr),
sizeof(nfs_data.hostname)-1);
/* Set the name of the directory to mount */
if (nfs_path[0] == '\0' || strncmp(name, "default", 7))
strncpy(buf, name, NFS_MAXPATHLEN);
else
strncpy(buf, nfs_path, NFS_MAXPATHLEN);
if ((options = strchr(buf, ',')))
*options++ = '\0';
if (!strcmp(buf, "default"))
strcpy(buf, NFS_ROOT);
cp = in_ntoa(myaddr.sin_addr.s_addr);
if (strlen(buf) + strlen(cp) > NFS_MAXPATHLEN) {
printk(KERN_ERR "Root-NFS: Pathname for remote directory too long.\n");
return -1;
}
/* update nfs_path with path from nfsroot=... command line parameter */
if (*buf)
sprintf(nfs_path, buf, cp);
/* Set some default values */
nfs_port = -1;
nfs_data.version = NFS_MOUNT_VERSION;
nfs_data.flags = 0;
nfs_data.rsize = NFS_DEF_FILE_IO_BUFFER_SIZE;
nfs_data.wsize = NFS_DEF_FILE_IO_BUFFER_SIZE;
nfs_data.timeo = 7;
nfs_data.retrans = 3;
nfs_data.acregmin = 3;
nfs_data.acregmax = 60;
nfs_data.acdirmin = 30;
nfs_data.acdirmax = 60;
/* Process any options */
if (options) {
cp = strtok(options, ",");
while (cp) {
if ((val = strchr(cp, '='))) {
struct nfs_int_opts *opts = root_int_opts;
*val++ = '\0';
while (opts->name && strcmp(opts->name, cp))
opts++;
if (opts->name)
*(opts->val) = (int) simple_strtoul(val, NULL, 10);
} else {
struct nfs_bool_opts *opts = root_bool_opts;
while (opts->name && strcmp(opts->name, cp))
opts++;
if (opts->name) {
nfs_data.flags &= opts->and_mask;
nfs_data.flags |= opts->or_mask;
}
}
cp = strtok(NULL, ",");
}
}
return 0;
}
/*
* Tell the user what's going on.
*/
#ifdef NFSROOT_DEBUG
static void root_nfs_print(void)
{
#define IN_NTOA(x) (((x) == INADDR_NONE) ? "none" : in_ntoa(x))
printk(KERN_NOTICE "Root-NFS: IP config: dev=%s, ",
root_dev ? root_dev->name : "none");
printk("local=%s, ", IN_NTOA(myaddr.sin_addr.s_addr));
printk("server=%s, ", IN_NTOA(server.sin_addr.s_addr));
printk("gw=%s, ", IN_NTOA(gateway.sin_addr.s_addr));
printk("mask=%s, ", IN_NTOA(netmask.sin_addr.s_addr));
printk("host=%s, domain=%s\n",
system_utsname.nodename[0] ? system_utsname.nodename : "none",
system_utsname.domainname[0] ? system_utsname.domainname : "none");
printk(KERN_NOTICE "Root-NFS: Mounting %s on server %s as root\n",
nfs_path, nfs_data.hostname);
printk(KERN_NOTICE "Root-NFS: rsize = %d, wsize = %d, timeo = %d, retrans = %d\n",
nfs_data.rsize, nfs_data.wsize, nfs_data.timeo, nfs_data.retrans);
printk(KERN_NOTICE "Root-NFS: acreg (min,max) = (%d,%d), acdir (min,max) = (%d,%d)\n",
nfs_data.acregmin, nfs_data.acregmax,
nfs_data.acdirmin, nfs_data.acdirmax);
printk(KERN_NOTICE "Root-NFS: port = %d, flags = %08x\n",
nfs_port, nfs_data.flags);
#undef IN_NTOA
}
#endif
/*
* Decode any IP configuration options in the "nfsaddrs" kernel command
* line parameter. It consists of option fields separated by colons in
* the following order:
*
* <client-ip>:<server-ip>:<gw-ip>:<netmask>:<host name>:<device>:<bootp|rarp>
*
* Any of the fields can be empty which means to use a default value:
* <client-ip> - address given by BOOTP or RARP
* <server-ip> - address of host returning BOOTP or RARP packet
* <gw-ip> - none, or the address returned by BOOTP
* <netmask> - automatically determined from <client-ip>, or the
* one returned by BOOTP
* <host name> - <client-ip> in ASCII notation, or the name returned
* by BOOTP
* <device> - use all available devices for RARP and the first
* one for BOOTP
* <bootp|rarp> - use both protocols to determine my own address
*/
static void root_nfs_addrs(char *addrs)
{
char *cp, *ip, *dp;
int num = 0;
/* Clear all addresses and strings */
myaddr.sin_family = server.sin_family = rarp_serv.sin_family =
gateway.sin_family = netmask.sin_family = AF_INET;
myaddr.sin_addr.s_addr = server.sin_addr.s_addr = rarp_serv.sin_addr.s_addr =
gateway.sin_addr.s_addr = netmask.sin_addr.s_addr = INADDR_NONE;
system_utsname.nodename[0] = '\0';
system_utsname.domainname[0] = '\0';
user_dev_name[0] = '\0';
bootp_flag = rarp_flag = 1;
/* The following is just a shortcut for automatic IP configuration */
if (!strcmp(addrs, "bootp")) {
rarp_flag = 0;
return;
} else if (!strcmp(addrs, "rarp")) {
bootp_flag = 0;
return;
} else if (!strcmp(addrs, "both")) {
return;
}
/* Parse the whole string */
ip = addrs;
while (ip && *ip) {
if ((cp = strchr(ip, ':')))
*cp++ = '\0';
if (strlen(ip) > 0) {
#ifdef NFSROOT_DEBUG
printk(KERN_NOTICE "Root-NFS: Config string num %d is \"%s\"\n",
num, ip);
#endif
switch (num) {
case 0:
if ((myaddr.sin_addr.s_addr = in_aton(ip)) == INADDR_ANY)
myaddr.sin_addr.s_addr = INADDR_NONE;
break;
case 1:
if ((server.sin_addr.s_addr = in_aton(ip)) == INADDR_ANY)
server.sin_addr.s_addr = INADDR_NONE;
break;
case 2:
if ((gateway.sin_addr.s_addr = in_aton(ip)) == INADDR_ANY)
gateway.sin_addr.s_addr = INADDR_NONE;
break;
case 3:
if ((netmask.sin_addr.s_addr = in_aton(ip)) == INADDR_ANY)
netmask.sin_addr.s_addr = INADDR_NONE;
break;
case 4:
if ((dp = strchr(ip, '.'))) {
*dp++ = '\0';
strncpy(system_utsname.domainname, dp, __NEW_UTS_LEN);
system_utsname.domainname[__NEW_UTS_LEN] = '\0';
}
strncpy(system_utsname.nodename, ip, __NEW_UTS_LEN);
system_utsname.nodename[__NEW_UTS_LEN] = '\0';
break;
case 5:
strncpy(user_dev_name, ip, IFNAMSIZ);
user_dev_name[IFNAMSIZ-1] = '\0';
break;
case 6:
if (!strcmp(ip, "rarp"))
bootp_flag = 0;
else if (!strcmp(ip, "bootp"))
rarp_flag = 0;
else if (strcmp(ip, "both"))
bootp_flag = rarp_flag = 0;
break;
default:
break;
}
}
ip = cp;
num++;
}
rarp_serv = server;
}
/*
* Set the interface address and configure a route to the server.
*/
static int root_nfs_setup(void)
{
struct rtentry route;
/* Set the default system name in case none was previously found */
if (!system_utsname.nodename[0]) {
strncpy(system_utsname.nodename, in_ntoa(myaddr.sin_addr.s_addr), __NEW_UTS_LEN);
system_utsname.nodename[__NEW_UTS_LEN] = '\0';
}
/* Set the correct netmask */
if (netmask.sin_addr.s_addr == INADDR_NONE)
netmask.sin_addr.s_addr = ip_get_mask(myaddr.sin_addr.s_addr);
/* Setup the device correctly */
root_dev->family = myaddr.sin_family;
root_dev->pa_addr = myaddr.sin_addr.s_addr;
root_dev->pa_mask = netmask.sin_addr.s_addr;
root_dev->pa_brdaddr = root_dev->pa_addr | ~root_dev->pa_mask;
root_dev->pa_dstaddr = 0;
/*
* Now add a route to the server. If there is no gateway given,
* the server is on the same subnet, so we establish only a route to
* the local network. Otherwise we create a route to the gateway (the
* same local network router as in the former case) and then setup a
* gatewayed default route. Note that this gives sufficient network
* setup even for full system operation in all common cases.
*/
memset(&route, 0, sizeof(route)); /* Local subnet route */
route.rt_dev = root_dev->name;
route.rt_mss = root_dev->mtu;
route.rt_flags = RTF_UP;
*((struct sockaddr_in *) &(route.rt_dst)) = myaddr;
(((struct sockaddr_in *) &(route.rt_dst)))->sin_addr.s_addr &= netmask.sin_addr.s_addr;
*((struct sockaddr_in *) &(route.rt_genmask)) = netmask;
if (ip_rt_new(&route)) {
printk(KERN_ERR "Root-NFS: Adding of local route failed!\n");
return -1;
}
if (gateway.sin_addr.s_addr != INADDR_NONE) { /* Default route */
(((struct sockaddr_in *) &(route.rt_dst)))->sin_addr.s_addr = INADDR_ANY;
(((struct sockaddr_in *) &(route.rt_genmask)))->sin_addr.s_addr = INADDR_ANY;
*((struct sockaddr_in *) &(route.rt_gateway)) = gateway;
route.rt_flags |= RTF_GATEWAY;
if ((gateway.sin_addr.s_addr ^ myaddr.sin_addr.s_addr) & netmask.sin_addr.s_addr) {
printk(KERN_ERR "Root-NFS: Gateway not on local network!\n");
return -1;
}
if (ip_rt_new(&route)) {
printk(KERN_ERR "Root-NFS: Adding of default route failed!\n");
return -1;
}
} else if ((server.sin_addr.s_addr ^ myaddr.sin_addr.s_addr) & netmask.sin_addr.s_addr) {
printk(KERN_ERR "Root-NFS: Boot server not on local network and no default gateway configured!\n");
return -1;
}
return 0;
}
/*
* Get the necessary IP addresses and prepare for mounting the required
* NFS filesystem.
*/
int nfs_root_init(char *nfsname, char *nfsaddrs)
{
/*
* Decode IP addresses and other configuration info contained
* in the nfsaddrs string (which came from the kernel command
* line).
*/
root_nfs_addrs(nfsaddrs);
/*
* Setup all network devices
*/
if (root_dev_open() < 0)
return -1;
/*
* If the config information is insufficient (e.g., our IP address or
* IP address of the boot server is missing or we have multiple network
* interfaces and no default was set), use BOOTP or RARP to get the
* missing values.
*
* Note that we don't try to set up correct routes for multiple
* interfaces (could be solved by trying icmp echo requests), because
* it's only necessary in the rare case of multiple ethernet devices
* in the (diskless) system and if the server is on another subnet.
* If only one interface is installed, the routing is obvious.
*/
if ((myaddr.sin_addr.s_addr == INADDR_NONE ||
server.sin_addr.s_addr == INADDR_NONE ||
(open_base != NULL && open_base->next != NULL))
#ifdef CONFIG_RNFS_DYNAMIC
&& root_auto_config() < 0
#endif
) {
root_dev_close();
return -1;
}
if (root_dev == NULL) {
if (open_base != NULL && open_base->next == NULL) {
root_dev = open_base->dev;
} else {
printk(KERN_ERR "Root-NFS: Multiple devices and no server\n");
root_dev_close();
return -1;
}
}
/*
* Close all network devices except the device which connects to
* server
*/
root_dev_close();
/*
* Decode the root directory path name and NFS options from
* the kernel command line. This has to go here in order to
* be able to use the client IP address for the remote root
* directory (necessary for pure RARP booting).
*/
if (root_nfs_name(nfsname) < 0)
return -1;
/*
* Setup devices and routes. The server directory is actually
* mounted after init() has been started.
*/
if (root_nfs_setup() < 0)
return -1;
#ifdef NFSROOT_DEBUG
root_nfs_print();
#endif
return 0;
}
/***************************************************************************
Routines to actually mount the root directory
***************************************************************************/
static struct file *nfs_file; /* File descriptor pointing to inode */
static struct inode *nfs_sock_inode; /* Inode containing socket */
static int *rpc_packet = NULL; /* RPC packet */
/*
* Open a UDP socket.
*/
static int root_nfs_open(void)
{
/* Open the socket */
if ((nfs_data.fd = sys_socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) {
printk(KERN_ERR "Root-NFS: Cannot open UDP socket for NFS!\n");
return -1;
}
nfs_file = current->files->fd[nfs_data.fd];
nfs_sock_inode = nfs_file->f_inode;
return 0;
}
/*
* Close the UDP file descriptor. If nfs_read_super is successful, it
* increases the reference count, so we can simply close the file, and
* the socket keeps open.
*/
static void root_nfs_close(void)
{
/*
* The following close doesn't touch the server structure, which
* now contains a file pointer pointing into nowhere. The system
* _should_ crash as soon as someone tries to select on the root
* filesystem. Haven't tried it yet - we can still change it back
* to the old way of keeping a static copy of all important data
* structures, including their pointers. At least this should be
* checked out _carefully_ before going into a public release
* kernel. - GK
*/
sys_close(nfs_data.fd);
}
/*
* Find a suitable listening port and bind to it
*/
static int root_nfs_bind(void)
{
int res = -1;
short port = STARTPORT;
struct sockaddr_in *sin = &myaddr;
int i;
if (nfs_sock_inode->u.socket_i.ops->bind) {
for (i = 0; i < NPORTS && res < 0; i++) {
sin->sin_port = htons(port++);
if (port > ENDPORT) {
port = STARTPORT;
}
res = nfs_sock_inode->u.socket_i.ops->bind(&nfs_sock_inode->u.socket_i,
(struct sockaddr *)sin,
sizeof(struct sockaddr_in));
}
}
if (res < 0) {
printk(KERN_ERR "Root-NFS: Cannot find a suitable listening port\n");
root_nfs_close();
return -1;
}
#ifdef NFSROOT_DEBUG
printk(KERN_NOTICE "Root-NFS: Binding to listening port %d\n", port);
#endif
return 0;
}
/*
* Send an RPC request and wait for the answer
*/
static int *root_nfs_call(int *end)
{
struct socket *sock;
int dummylen;
static struct nfs_server s = {
0, /* struct file * */
0, /* struct rsock * */
{
0, "",
}, /* toaddr */
0, /* lock */
NULL, /* wait queue */
NFS_MOUNT_SOFT, /* flags */
0, 0, /* rsize, wsize */
0, /* timeo */
0, /* retrans */
3 * HZ, 60 * HZ, 30 * HZ, 60 * HZ, "\0"
};
s.file = nfs_file;
sock = &((nfs_file->f_inode)->u.socket_i);
/* Extract the other end of the socket into s->toaddr */
sock->ops->getname(sock, &(s.toaddr), &dummylen, 1);
((struct sockaddr_in *) &s.toaddr)->sin_port = server.sin_port;
((struct sockaddr_in *) &s.toaddr)->sin_family = server.sin_family;
((struct sockaddr_in *) &s.toaddr)->sin_addr.s_addr = server.sin_addr.s_addr;
s.rsock = rpc_makesock(nfs_file);
s.flags = nfs_data.flags;
s.rsize = nfs_data.rsize;
s.wsize = nfs_data.wsize;
s.timeo = nfs_data.timeo * HZ / 10;
s.retrans = nfs_data.retrans;
strcpy(s.hostname, nfs_data.hostname);
/*
* First connect the UDP socket to a server port, then send the
* packet out, and finally check whether the answer is OK.
*/
if (nfs_sock_inode->u.socket_i.ops->connect &&
nfs_sock_inode->u.socket_i.ops->connect(&nfs_sock_inode->u.socket_i,
(struct sockaddr *) &server,
sizeof(struct sockaddr_in),
nfs_file->f_flags) < 0)
return NULL;
if (nfs_rpc_call(&s, rpc_packet, end, nfs_data.wsize) < 0)
return NULL;
return rpc_verify(rpc_packet);
}
/*
* Create an RPC packet header
*/
static int *root_nfs_header(int proc, int program, int version)
{
int groups[] = { 0, NOGROUP };
if (rpc_packet == NULL) {
if (!(rpc_packet = kmalloc(nfs_data.wsize + 1024, GFP_NFS))) {
printk(KERN_ERR "Root-NFS: Cannot allocate UDP buffer\n");
return NULL;
}
}
return rpc_header(rpc_packet, proc, program, version, 0, 0, groups);
}
/*
* Query server portmapper for the port of a daemon program
*/
static int root_nfs_get_port(int program, int version)
{
int *p;
/* Prepare header for portmap request */
server.sin_port = htons(NFS_PMAP_PORT);
p = root_nfs_header(NFS_PMAP_PROC, NFS_PMAP_PROGRAM, NFS_PMAP_VERSION);
if (!p)
return -1;
/* Set arguments for portmapper */
*p++ = htonl(program);
*p++ = htonl(version);
*p++ = htonl(IPPROTO_UDP);
*p++ = 0;
/* Send request to server portmapper */
if ((p = root_nfs_call(p)) == NULL)
return -1;
return ntohl(*p);
}
/*
* Get portnumbers for mountd and nfsd from server
*/
static int root_nfs_ports(void)
{
int port;
if (nfs_port < 0) {
if ((port = root_nfs_get_port(NFS_NFS_PROGRAM, NFS_NFS_VERSION)) < 0) {
printk(KERN_ERR "Root-NFS: Unable to get nfsd port number from server, using default\n");
port = NFS_NFS_PORT;
}
nfs_port = port;
#ifdef NFSROOT_DEBUG
printk(KERN_NOTICE "Root-NFS: Portmapper on server returned %d as nfsd port\n", port);
#endif
}
if ((port = root_nfs_get_port(NFS_MOUNT_PROGRAM, NFS_MOUNT_VERSION)) < 0) {
printk(KERN_ERR "Root-NFS: Unable to get mountd port number from server, using default\n");
port = NFS_MOUNT_PORT;
}
server.sin_port = htons(port);
#ifdef NFSROOT_DEBUG
printk(KERN_NOTICE "Root-NFS: Portmapper on server returned %d as mountd port\n", port);
#endif
return 0;
}
/*
* Get a file handle from the server for the directory which is to be
* mounted
*/
static int root_nfs_get_handle(void)
{
int len, status, *p;
/* Prepare header for mountd request */
p = root_nfs_header(NFS_MOUNT_PROC, NFS_MOUNT_PROGRAM, NFS_MOUNT_VERSION);
if (!p) {
root_nfs_close();
return -1;
}
/* Set arguments for mountd */
len = strlen(nfs_path);
*p++ = htonl(len);
memcpy(p, nfs_path, len);
len = (len + 3) >> 2;
p[len] = 0;
p += len;
/* Send request to server mountd */
if ((p = root_nfs_call(p)) == NULL) {
root_nfs_close();
return -1;
}
status = ntohl(*p++);
if (status == 0) {
nfs_data.root = *((struct nfs_fh *) p);
printk(KERN_NOTICE "Root-NFS: Got file handle for %s via RPC\n", nfs_path);
} else {
printk(KERN_ERR "Root-NFS: Server returned error %d while mounting %s\n",
status, nfs_path);
root_nfs_close();
return -1;
}
return 0;
}
/*
* Now actually mount the given directory
*/
static int root_nfs_do_mount(struct super_block *sb)
{
/* First connect to the nfsd port on the server */
server.sin_port = htons(nfs_port);
nfs_data.addr = server;
if (nfs_sock_inode->u.socket_i.ops->connect &&
nfs_sock_inode->u.socket_i.ops->connect(&nfs_sock_inode->u.socket_i,
(struct sockaddr *) &server,
sizeof(struct sockaddr_in),
nfs_file->f_flags) < 0) {
root_nfs_close();
return -1;
}
/* Now (finally ;-)) read the super block for mounting */
if (nfs_read_super(sb, &nfs_data, 1) == NULL) {
root_nfs_close();
return -1;
}
return 0;
}
/*
* Get the NFS port numbers and file handle, and then read the super-
* block for mounting.
*/
int nfs_root_mount(struct super_block *sb)
{
if (root_nfs_open() < 0)
return -1;
if (root_nfs_bind() < 0)
return -1;
if (root_nfs_ports() < 0)
return -1;
if (root_nfs_get_handle() < 0)
return -1;
if (root_nfs_do_mount(sb) < 0)
return -1;
root_nfs_close();
return 0;
}
