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#include <linux/config.h>
#include <linux/module.h>
#include <asm/uaccess.h>
#include <asm/system.h>
#include <asm/bitops.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/socket.h>
#include <linux/sockios.h>
#include <linux/in.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/if_ether.h>
#include <linux/route.h>
#include <linux/inet.h>
#include <linux/notifier.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/if_arp.h>
#include <linux/skbuff.h>
#include <linux/termios.h> /* For TIOCOUTQ/INQ */
#include <net/datalink.h>
#include <net/p8022.h>
#include <net/psnap.h>
#include <net/sock.h>
#include <linux/proc_fs.h>
#include <linux/stat.h>
#include <linux/firewall.h>
#undef NETBEUI_DEBUG
#ifdef NETBEUI_DEBUG
#define DPRINT(x) print(x)
#else
#define DPRINT(x)
#endif
#define min(a,b) (((a)<(b))?(a):(b))
/***********************************************************************************************************************\
* *
* Handlers for the socket list. *
* *
\***********************************************************************************************************************/
static netbeui_socket *volatile netbeui_socket_list=NULL;
/*
* Note: Sockets may not be removed _during_ an interrupt or inet_bh
* handler using this technique. They can be added although we do not
* use this facility.
*/
static void netbeui_remove_socket(netbeui_socket *sk)
{
unsigned long flags;
netbeui_socket *s;
save_flags(flags);
cli();
s=netbeui_socket_list;
if(s==sk)
{
netbeui_socket_list=s->next;
restore_flags(flags);
return;
}
while(s && s->next)
{
if(s->next==sk)
{
s->next=sk->next;
restore_flags(flags);
return;
}
s=s->next;
}
restore_flags(flags);
}
static void netbeui_insert_socket(netbeui_socket *sk)
{
unsigned long flags;
save_flags(flags);
cli();
sk->next=netbeui_socket_list;
netbeui_socket_list=sk;
restore_flags(flags);
}
/*
* This is only called from user mode. Thus it protects itself against
* interrupt users but doesn't worry about being called during work.
* Once it is removed from the queue no interrupt or bottom half will
* touch it and we are (fairly 8-) ) safe.
*/
static void netbeui_destroy_socket(netbeui_socket *sk);
/*
* Handler for deferred kills.
*/
static void netbeui_destroy_timer(unsigned long data)
{
netbeui_destroy_socket((netbeui_socket *)data);
}
static void netbeui_destroy_socket(netbeui_socket *sk)
{
struct sk_buff *skb;
netbeui_remove_socket(sk);
while((skb=skb_dequeue(&sk->receive_queue))!=NULL)
{
kfree_skb(skb,FREE_READ);
}
if(sk->wmem_alloc == 0 && sk->rmem_alloc == 0 && sk->dead)
{
sk_free(sk);
MOD_DEC_USE_COUNT;
}
else
{
/*
* Someone is using our buffers still.. defer
*/
init_timer(&sk->timer);
sk->timer.expires=jiffies+10*HZ;
sk->timer.function=netbeui_destroy_timer;
sk->timer.data = (unsigned long)sk;
add_timer(&sk->timer);
}
}
/*
* Called from proc fs
*/
int netbeui_get_info(char *buffer, char **start, off_t offset, int length, int dummy)
{
netbeui_socket *s;
int len=0;
off_t pos=0;
off_t begin=0;
/*
* Output the netbeui data for the /proc virtual fs.
*/
len += sprintf (buffer,"Type local_addr remote_addr tx_queue rx_queue st uid\n");
for (s = netbeui_socket_list; s != NULL; s = s->next)
{
len += sprintf (buffer+len,"%02X ", s->type);
len += sprintf (buffer+len,"%04X:%02X:%02X ",
ntohs(s->protinfo.af_at.src_net),
s->protinfo.af_at.src_node,
s->protinfo.af_at.src_port);
len += sprintf (buffer+len,"%04X:%02X:%02X ",
ntohs(s->protinfo.af_at.dest_net),
s->protinfo.af_at.dest_node,
s->protinfo.af_at.dest_port);
len += sprintf (buffer+len,"%08X:%08X ", s->wmem_alloc, s->rmem_alloc);
len += sprintf (buffer+len,"%02X %d\n", s->state, SOCK_INODE(s->socket)->i_uid);
/* Are we still dumping unwanted data then discard the record */
pos=begin+len;
if(pos<offset)
{
len=0; /* Keep dumping into the buffer start */
begin=pos;
}
if(pos>offset+length) /* We have dumped enough */
break;
}
/* The data in question runs from begin to begin+len */
*start=buffer+(offset-begin); /* Start of wanted data */
len-=(offset-begin); /* Remove unwanted header data from length */
if(len>length)
len=length; /* Remove unwanted tail data from length */
return len;
}
/*
* A device event has occurred. Watch for devices going down and
* delete our use of them (iface and route).
*/
static int nb_device_event(struct notifier_block *this, unsigned long event, void *ptr)
{
if(event==NETDEV_DOWN)
{
/* Discard any use of this */
netbeui_drop_device((struct device *)ptr);
}
return NOTIFY_DONE;
}
/*******************************************************************************************************************\
* *
* Handling for system calls applied via the various interfaces to a netbeui socket object *
* *
\*******************************************************************************************************************/
/*
* Generic fcntl calls are already dealt with. If we don't need funny ones
* this is the all you need. Async I/O is also separate.
*/
static int netbeui_fcntl(struct socket *sock, unsigned int cmd, unsigned long arg)
{
/* netbeui_socket *sk=(netbeui_socket *)sock->data;*/
switch(cmd)
{
default:
return(-EINVAL);
}
}
/*
* Set 'magic' options for netbeui. If we don't have any this is fine
* as it is.
*/
static int netbeui_setsockopt(struct socket *sock, int level, int optname, char *optval, int optlen)
{
netbeui_socket *sk;
int err,opt;
sk=(netbeui_socket *)sock->data;
if(optval==NULL)
return(-EINVAL);
err = get_user(opt, (int *)optval);
if (err)
return err;
switch(level)
{
case SOL_NETBEUI:
switch(optname)
{
default:
return -EOPNOTSUPP;
}
break;
case SOL_SOCKET:
return sock_setsockopt(sk,level,optname,optval,optlen);
default:
return -EOPNOTSUPP;
}
}
/*
* Get any magic options. Comment above applies.
*/
static int netbeui_getsockopt(struct socket *sock, int level, int optname,
char *optval, int *optlen)
{
netbeui_socket *sk;
int val=0;
int err;
sk=(netbeui_socket *)sock->data;
switch(level)
{
case SOL_NETBEUI:
switch(optname)
{
default:
return -ENOPROTOOPT;
}
break;
case SOL_SOCKET:
return sock_getsockopt(sk,level,optname,optval,optlen);
default:
return -EOPNOTSUPP;
}
err = put_user(sizeof(int),optlen);
if (!err)
err = put_user(val, (int *) optval);
return err;
}
/*
* Only for connection oriented sockets - ignore
*/
static int netbeui_listen(struct socket *sock, int backlog)
{
struct sock *sk=(netbeui_socket *)sock->data;
if(sk->state!=TCP_CLOSED)
return -EINVAL;
if(backlog<0)
return -EINVAL;
if(backlog<128)
sk->backlog=backlog;
else
sk->backlog=128;
sk->state=TCP_LISTEN;
sk->state_change(sk);
netbeui_llc_listen(sk);
return 0;
}
/*
* These are standard.
*/
static void def_callback1(struct sock *sk)
{
if(!sk->dead)
wake_up_interruptible(sk->sleep);
}
static void def_callback2(struct sock *sk, int len)
{
if(!sk->dead)
{
wake_up_interruptible(sk->sleep);
sock_wake_async(sk->socket,0);
}
}
/*
* Create a socket. Initialise the socket, blank the addresses
* set the state.
*/
static int netbeui_create(struct socket *sock, int protocol)
{
netbeui_socket *sk;
sk=(netbeui_socket *)sk_alloc(GFP_KERNEL);
if(sk==NULL)
return(-ENOBUFS);
switch(sock->type)
{
case SOCK_DGRAM:
break;
case SOCK_SEQPACKET:
break;
default:
sk_free((void *)sk);
return(-ESOCKTNOSUPPORT);
}
sk->llc802=llc_alloc(GFP_KERNEL);
if(sk->llc802==NULL)
{
sk_free((void *)sk);
return -ENOBUFS:
}
MOD_INC_USE_COUNT;
sk->allocation=GFP_KERNEL;
sk->rcvbuf=SK_RMEM_MAX;
sk->sndbuf=SK_WMEM_MAX;
sk->pair=NULL;
sk->priority=SOPRI_NORMAL;
skb_queue_head_init(&sk->receive_queue);
skb_queue_head_init(&sk->write_queue);
skb_queue_head_init(&sk->back_log);
sk->state=TCP_CLOSE;
sk->socket=sock;
sk->type=sock->type;
sk->mtu=1500;
if(sock!=NULL)
{
sock->data=(void *)sk;
sk->sleep=sock->wait;
}
sk->state_change=def_callback1;
sk->data_ready=def_callback2;
sk->write_space=def_callback1;
sk->error_report=def_callback1;
sk->zapped=1;
return(0);
}
/*
* Copy a socket. No work needed.
*/
static int netbeui_dup(struct socket *newsock,struct socket *oldsock)
{
return(netbeui_create(newsock,oldsock->type));
}
/*
* Free a socket. No work needed
*/
static int netbeui_release(struct socket *sock, struct socket *peer)
{
netbeui_socket *sk=(netbeui_socket *)sock->data;
if(sk==NULL)
return(0);
if(!sk->dead)
sk->state_change(sk);
sk->dead=1;
sock->data=NULL;
netbeui_destroy_socket(sk);
return(0);
}
/*
* Set the address 'our end' of the connection.
*/
static int netbeui_bind(struct socket *sock, struct sockaddr *uaddr,size_t addr_len)
{
netbeui_socket *sk;
struct sockaddr_netbeui *addr=(struct sockaddr_netbeui *)uaddr;
sk=(netbeui_socket *)sock->data;
if(sk->zapped==0)
return(-EINVAL);
if(addr_len!=sizeof(struct sockaddr_at))
return -EINVAL;
if(addr->sat_family!=AF_NETBEUI)
return -EAFNOSUPPORT;
if(netbeui_find_socket(addr)!=NULL)
return -EADDRINUSE;
netbeui_insert_socket(sk);
sk->zapped=0;
return(0);
}
/*
* Set the address we talk to.
*/
static int netbeui_connect(struct socket *sock, struct sockaddr *uaddr,
size_t addr_len, int flags)
{
netbeui_socket *sk=(netbeui_socket *)sock->data;
struct sockaddr_netbeui *addr;
sk->state = TCP_CLOSE;
sock->state = SS_UNCONNECTED;
if(addr_len!=sizeof(*addr))
return(-EINVAL);
addr=(struct sockaddr_netbeui *)uaddr;
if(addr->sat_family!=AF_NETBEUI)
return -EAFNOSUPPORT;
/* FIXME - Netbios broadcast semantics ?? */
if(addr->sat_addr.s_node==ATADDR_BCAST && !sk->broadcast)
return -EACCES;
if(sk->zapped)
return -EINVAL;
if(atrtr_get_dev(&addr->sat_addr)==NULL)
return -ENETUNREACH;
}
/*
* Not relevant
*/
static int netbeui_socketpair(struct socket *sock1, struct socket *sock2)
{
return(-EOPNOTSUPP);
}
/*
* WRITE ME
*/
static int netbeui_accept(struct socket *sock, struct socket *newsock, int flags)
{
if(newsock->data)
sk_free(newsock->data);
return -EOPNOTSUPP;
}
/*
* Find the name of a netbeui socket. Just copy the right
* fields into the sockaddr.
*/
static int netbeui_getname(struct socket *sock, struct sockaddr *uaddr,
size_t *uaddr_len, int peer)
{
struct sockaddr_netbeui snb;
netbeui_socket *sk;
sk=(netbeui_socket *)sock->data;
if(sk->zapped)
{
return -EINVAL;
}
*uaddr_len = sizeof(struct sockaddr_netbeui);
if(peer)
{
if(sk->state!=TCP_ESTABLISHED)
return -ENOTCONN;
}
else
{
}
snb.snb_family = AF_NETBEUI;
memcpy(uaddr,&snb,sizeof(snb));
return(0);
}
/*
* Receive a packet (in skb) from device dev.
*/
static int netbeui_rcv(struct sk_buff *skb, struct device *dev, struct packet_type *pt)
{
netbeui_socket *sock;
}
static int netbeui_sendmsg(struct socket *sock, struct msghdr *msg, int len, int nonblock, int flags)
{
netbeui_socket *sk=(netbeui_socket *)sock->data;
struct sockaddr_at *usat=(struct sockaddr_at *)msg->msg_name;
struct sockaddr_at local_snetbeui, gsat;
struct sk_buff *skb;
struct device *dev;
struct ddpehdr *ddp;
int size;
struct netbeui_route *rt;
int loopback=0;
int err;
if(flags)
return -EINVAL;
if(len>587)
return -EMSGSIZE;
if(usat)
{
if(sk->zapped)
{
if(netbeui_autobind(sk)<0)
return -EBUSY;
}
if(msg->msg_namelen <sizeof(*usat))
return(-EINVAL);
if(usat->sat_family != AF_NETBEUI)
return -EINVAL;
#if 0 /* netnetbeui doesn't implement this check */
if(usat->sat_addr.s_node==ATADDR_BCAST && !sk->broadcast)
return -EPERM;
#endif
}
else
{
if(sk->state!=TCP_ESTABLISHED)
return -ENOTCONN;
usat=&local_snetbeui;
usat->sat_family=AF_NETBEUI;
usat->sat_port=sk->protinfo.af_at.dest_port;
usat->sat_addr.s_node=sk->protinfo.af_at.dest_node;
usat->sat_addr.s_net=sk->protinfo.af_at.dest_net;
}
/* Build a packet */
if(sk->debug)
printk("SK %p: Got address.\n",sk);
size=sizeof(struct ddpehdr)+len+nb_dl->header_length; /* For headers */
if(usat->sat_addr.s_net!=0 || usat->sat_addr.s_node == ATADDR_ANYNODE)
{
rt=atrtr_find(&usat->sat_addr);
if(rt==NULL)
return -ENETUNREACH;
dev=rt->dev;
}
else
{
struct at_addr at_hint;
at_hint.s_node=0;
at_hint.s_net=sk->protinfo.af_at.src_net;
rt=atrtr_find(&at_hint);
if(rt==NULL)
return -ENETUNREACH;
dev=rt->dev;
}
if(sk->debug)
printk("SK %p: Size needed %d, device %s\n", sk, size, dev->name);
size += dev->hard_header_len;
skb = sock_alloc_send_skb(sk, size, 0, 0 , &err);
if(skb==NULL)
return err;
skb->sk=sk;
skb->free=1;
skb->arp=1;
skb_reserve(skb,nb_dl->header_length);
skb_reserve(skb,dev->hard_header_len);
skb->dev=dev;
if(sk->debug)
printk("SK %p: Begin build.\n", sk);
ddp=(struct ddpehdr *)skb_put(skb,sizeof(struct ddpehdr));
ddp->deh_pad=0;
ddp->deh_hops=0;
ddp->deh_len=len+sizeof(*ddp);
/*
* Fix up the length field [Ok this is horrible but otherwise
* I end up with unions of bit fields and messy bit field order
* compiler/endian dependencies..
*/
*((__u16 *)ddp)=ntohs(*((__u16 *)ddp));
ddp->deh_dnet=usat->sat_addr.s_net;
ddp->deh_snet=sk->protinfo.af_at.src_net;
ddp->deh_dnode=usat->sat_addr.s_node;
ddp->deh_snode=sk->protinfo.af_at.src_node;
ddp->deh_dport=usat->sat_port;
ddp->deh_sport=sk->protinfo.af_at.src_port;
if(sk->debug)
printk("SK %p: Copy user data (%d bytes).\n", sk, len);
err = memcpy_fromiovec(skb_put(skb,len),msg->msg_iov,len);
if (err)
{
kfree_skb(skb, FREE_WRITE);
return -EFAULT;
}
if(sk->no_check==1)
ddp->deh_sum=0;
else
ddp->deh_sum=netbeui_checksum(ddp, len+sizeof(*ddp));
#ifdef CONFIG_FIREWALL
if(call_out_firewall(AF_NETBEUI, skb->dev, ddp, NULL)!=FW_ACCEPT)
{
kfree_skb(skb, FREE_WRITE);
return -EPERM;
}
#endif
/*
* Loopback broadcast packets to non gateway targets (ie routes
* to group we are in)
*/
if(ddp->deh_dnode==ATADDR_BCAST)
{
if((!(rt->flags&RTF_GATEWAY))&&(!(dev->flags&IFF_LOOPBACK)))
{
struct sk_buff *skb2=skb_clone(skb, GFP_KERNEL);
if(skb2)
{
loopback=1;
if(sk->debug)
printk("SK %p: send out(copy).\n", sk);
if(aarp_send_ddp(dev,skb2,&usat->sat_addr, NULL)==-1)
kfree_skb(skb2, FREE_WRITE);
/* else queued/sent above in the aarp queue */
}
}
}
if((dev->flags&IFF_LOOPBACK) || loopback)
{
if(sk->debug)
printk("SK %p: Loop back.\n", sk);
/* loop back */
atomic_sub(skb->truesize, &sk->wmem_alloc);
nb_dl->datalink_header(nb_dl, skb, dev->dev_addr);
skb->sk = NULL;
skb->mac.raw=skb->data;
skb->h.raw = skb->data + nb_dl->header_length + dev->hard_header_len;
skb_pull(skb,dev->hard_header_len);
skb_pull(skb,nb_dl->header_length);
netbeui_rcv(skb,dev,NULL);
}
else
{
if(sk->debug)
printk("SK %p: send out.\n", sk);
if ( rt->flags & RTF_GATEWAY ) {
gsat.sat_addr = rt->gateway;
usat = &gsat;
}
if(nb_send_low(dev,skb,&usat->sat_addr, NULL)==-1)
kfree_skb(skb, FREE_WRITE);
/* else queued/sent above in the aarp queue */
}
if(sk->debug)
printk("SK %p: Done write (%d).\n", sk, len);
return len;
}
static int netbeui_recvmsg(struct socket *sock, struct msghdr *msg, int size, int noblock, int flags, int *addr_len)
{
netbeui_socket *sk=(netbeui_socket *)sock->data;
struct sockaddr_at *sat=(struct sockaddr_at *)msg->msg_name;
struct ddpehdr *ddp = NULL;
int copied = 0;
struct sk_buff *skb;
int er = 0;
if(addr_len)
*addr_len=sizeof(*sat);
skb=skb_recv_datagram(sk,flags,noblock,&er);
if(skb==NULL)
return er;
ddp = (struct ddpehdr *)(skb->h.raw);
if(sk->type==SOCK_RAW)
{
copied=ddp->deh_len;
if(copied > size)
{
copied=size;
msg->msg_flags|=MSG_TRUNC;
}
er = skb_copy_datagram_iovec(skb,0,msg->msg_iov,copied);
if (er)
goto out;
}
else
{
copied=ddp->deh_len - sizeof(*ddp);
if (copied > size)
{
copied = size;
msg->msg_flags|=MSG_TRUNC;
}
er = skb_copy_datagram_iovec(skb,sizeof(*ddp),msg->msg_iov,copied);
if (er)
goto out;
}
if(sat)
{
sat->sat_family=AF_NETBEUI;
sat->sat_port=ddp->deh_sport;
sat->sat_addr.s_node=ddp->deh_snode;
sat->sat_addr.s_net=ddp->deh_snet;
}
out:
skb_free_datagram(sk, skb);
return er ? er : (copied);
}
static int netbeui_shutdown(struct socket *sk,int how)
{
return -EOPNOTSUPP;
}
static int netbeui_select(struct socket *sock , int sel_type, select_table *wait)
{
netbeui_socket *sk=(netbeui_socket *)sock->data;
return datagram_select(sk,sel_type,wait);
}
/*
* Netbeui ioctl calls.
*/
static int netbeui_ioctl(struct socket *sock,unsigned int cmd, unsigned long arg)
{
long amount=0;
netbeui_socket *sk=(netbeui_socket *)sock->data;
switch(cmd)
{
/*
* Protocol layer
*/
case TIOCOUTQ:
amount=sk->sndbuf-sk->wmem_alloc;
if(amount<0)
amount=0;
break;
case TIOCINQ:
{
struct sk_buff *skb;
/* These two are safe on a single CPU system as only user tasks fiddle here */
if((skb=skb_peek(&sk->receive_queue))!=NULL)
amount=skb->len-sizeof(struct ddpehdr);
break;
}
case SIOCGSTAMP:
if (sk)
{
if(sk->stamp.tv_sec==0)
return -ENOENT;
return copy_to_user((void *)arg,&sk->stamp,sizeof(struct timeval)) ? -EFAULT : 0;
}
return -EINVAL;
/*
* Routing
*/
case SIOCADDRT:
case SIOCDELRT:
if(!suser())
return -EPERM;
return(atrtr_ioctl(cmd,(void *)arg));
/*
* Interface
*/
case SIOCGIFADDR:
case SIOCSIFADDR:
case SIOCGIFBRDADDR:
return atif_ioctl(cmd,(void *)arg);
/*
* Physical layer ioctl calls
*/
case SIOCSIFLINK:
case SIOCGIFHWADDR:
case SIOCSIFHWADDR:
case SIOCGIFFLAGS:
case SIOCSIFFLAGS:
case SIOCGIFMTU:
case SIOCGIFCONF:
case SIOCADDMULTI:
case SIOCDELMULTI:
return(dev_ioctl(cmd,(void *) arg));
case SIOCSIFMETRIC:
case SIOCSIFBRDADDR:
case SIOCGIFNETMASK:
case SIOCSIFNETMASK:
case SIOCGIFMEM:
case SIOCSIFMEM:
case SIOCGIFDSTADDR:
case SIOCSIFDSTADDR:
return -EINVAL;
default:
return -EINVAL;
}
return put_user(amount, (int *)arg);
}
static struct proto_ops netbeui_proto_ops = {
AF_NETBEUI,
netbeui_create,
netbeui_dup,
netbeui_release,
netbeui_bind,
netbeui_connect,
netbeui_socketpair,
netbeui_accept,
netbeui_getname,
netbeui_select,
netbeui_ioctl,
netbeui_listen,
netbeui_shutdown,
netbeui_setsockopt,
netbeui_getsockopt,
netbeui_fcntl,
netbeui_sendmsg,
netbeui_recvmsg
};
static struct notifier_block nb_notifier={
nb_device_event,
NULL,
0
};
static char nb_snap_id[]={0x08,0x00,0x07,0x80,0x9B};
#ifdef CONFIG_PROC_FS
static struct proc_dir_entry proc_netbeui = {
PROC_NET_NETBEUI, 9, "netbeui",
S_IFREG | S_IRUGO, 1, 0, 0
0, &proc_net_inode_operations,
netbeui_get_info
};
#endif
/* Called by proto.c on kernel start up */
void netbeui_proto_init(struct net_proto *pro)
{
(void) sock_register(netbeui_proto_ops.family, &netbeui_proto_ops);
/* ddp? isn't it atalk too? 8) */
if ((nb_dl = register_snap_client(nb_snap_id, netbeui_rcv)) == NULL)
printk(KERN_CRIT "Unable to register DDP with SNAP.\n");
register_netdevice_notifier(&nb_notifier);
#ifdef CONFIG_PROC_FS
proc_net_register(&proc_netbeui);
#endif
printk(KERN_INFO "NetBEUI 0.02 for Linux NET3.037\n");
}
#ifdef MODULE
int init_module(void)
{
netbeui_proto_init(NULL);
register_symtab(0);
return 0;
}
void cleanup_module(void)
{
unsigned long flags;
#ifdef CONFIG_PROC_FS
proc_net_unregister(PROC_NET_NETBEUI);
#endif
unregister_netdevice_notifier(&nb_notifier);
unregister_snap_client(nb_snap_id);
sock_unregister(netbeui_proto_ops.family);
}
#endif /* MODULE */
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