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    /or1k/trunk/linux/linux-2.4/net/ipx
    from Rev 1275 to Rev 1765
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  •

Rev 1275 → Rev 1765

/af_spx.c
0,0 → 1,937
/*
* This module implements the (SPP-derived) Sequenced Packet eXchange
* (SPX) protocol for Linux 2.1.X as specified in
* NetWare SPX Services Specification, Semantics and API
* Revision: 1.00
* Revision Date: February 9, 1993
*
* Developers:
* Jay Schulist <jschlst@samba.org>
* Jim Freeman <jfree@caldera.com>
*
* Changes:
* Alan Cox : Fixed an skb_unshare check for NULL
* that crashed it under load. Renamed and
* made static the ipx ops. Removed the hack
* ipx methods interface. Dropped AF_SPX - its
* the wrong abstraction.
* Eduardo Trapani : Added a check for the return value of
* ipx_if_offset that crashed sock_alloc_send_skb.
* Added spx_datagram_poll() so that select()
* works now on SPX sockets. Added updating
* of the alloc count to follow rmt_seq.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
* None of the authors or maintainers or their employers admit
* liability nor provide warranty for any of this software.
* This material is provided "as is" and at no charge.
*/
 
#include <linux/module.h>
#include <net/ipx.h>
#include <net/spx.h>
#include <net/sock.h>
#include <asm/byteorder.h>
#include <asm/uaccess.h>
#include <linux/uio.h>
#include <linux/unistd.h>
#include <linux/poll.h>
 
static struct proto_ops *ipx_operations;
static struct proto_ops spx_ops;
static __u16 connids;
 
/* Functions needed for SPX connection start up */
static int spx_transmit(struct sock *sk,struct sk_buff *skb,int type,int len);
static void spx_retransmit(unsigned long data);
static void spx_watchdog(unsigned long data);
void spx_rcv(struct sock *sk, int bytes);
 
extern void ipx_remove_socket(struct sock *sk);
 
/* Datagram poll: the same code as datagram_poll() in net/core
but the right spx buffers are looked at and
there is no question on the type of the socket
*/
static unsigned int spx_datagram_poll(struct file * file, struct socket *sock, poll_table *wait)
{
struct sock *sk = sock->sk;
struct spx_opt *pdata = &sk->tp_pinfo.af_spx;
unsigned int mask;
 
poll_wait(file, sk->sleep, wait);
mask = 0;
 
/* exceptional events? */
if (sk->err || !skb_queue_empty(&sk->error_queue))
mask |= POLLERR;
if (sk->shutdown & RCV_SHUTDOWN)
mask |= POLLHUP;
 
/* readable? */
if (!skb_queue_empty(&pdata->rcv_queue))
mask |= POLLIN | POLLRDNORM;
 
/* Need to check for termination and startup */
if (sk->state==TCP_CLOSE)
mask |= POLLHUP;
/* connection hasn't started yet? */
if (sk->state == TCP_SYN_SENT)
return mask;
 
/* writable? */
if (sock_writeable(sk))
mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
else
set_bit(SOCK_ASYNC_NOSPACE,&sk->socket->flags);
 
return mask;
}
 
/* Create the SPX specific data */
static int spx_sock_init(struct sock *sk)
{
struct spx_opt *pdata = &sk->tp_pinfo.af_spx;
 
pdata->state = SPX_CLOSED;
pdata->sequence = 0;
pdata->acknowledge = 0;
pdata->source_connid = htons(connids);
pdata->rmt_seq = 0;
connids++;
 
pdata->owner = (void *)sk;
pdata->sndbuf = sk->sndbuf;
 
pdata->watchdog.function = spx_watchdog;
pdata->watchdog.data = (unsigned long)sk;
pdata->wd_interval = VERIFY_TIMEOUT;
pdata->retransmit.function = spx_retransmit;
pdata->retransmit.data = (unsigned long)sk;
pdata->retransmits = 0;
pdata->retries = 0;
pdata->max_retries = RETRY_COUNT;
 
skb_queue_head_init(&pdata->rcv_queue);
skb_queue_head_init(&pdata->transmit_queue);
skb_queue_head_init(&pdata->retransmit_queue);
 
return (0);
}
 
static int spx_create(struct socket *sock, int protocol)
{
struct sock *sk;
 
/*
* Called on connection receive so cannot be GFP_KERNEL
*/
sk = sk_alloc(PF_IPX, GFP_ATOMIC, 1);
if(sk == NULL)
return (-ENOMEM);
 
switch(sock->type)
{
case SOCK_SEQPACKET:
sock->ops = &spx_ops;
break;
default:
sk_free(sk);
return (-ESOCKTNOSUPPORT);
}
 
sock_init_data(sock, sk);
spx_sock_init(sk);
sk->data_ready = spx_rcv;
sk->destruct = NULL;
sk->no_check = 1;
 
MOD_INC_USE_COUNT;
 
return (0);
}
 
 
void spx_close_socket(struct sock *sk)
{
struct spx_opt *pdata = &sk->tp_pinfo.af_spx;
 
pdata->state = SPX_CLOSED;
sk->state = TCP_CLOSE;
del_timer(&pdata->retransmit);
del_timer(&pdata->watchdog);
}
 
void spx_destroy_socket(struct sock *sk)
{
struct spx_opt *pdata = &sk->tp_pinfo.af_spx;
struct sk_buff *skb;
 
ipx_remove_socket(sk);
while((skb = skb_dequeue(&sk->receive_queue)) != NULL)
kfree_skb(skb);
while((skb = skb_dequeue(&pdata->transmit_queue)) != NULL)
kfree_skb(skb);
while((skb = skb_dequeue(&pdata->retransmit_queue)) != NULL)
kfree_skb(skb);
while((skb = skb_dequeue(&pdata->rcv_queue)) != NULL)
kfree_skb(skb);
 
sk_free(sk);
MOD_DEC_USE_COUNT;
}
 
/* Release an SPX socket */
static int spx_release(struct socket *sock)
{
struct sock *sk = sock->sk;
struct spx_opt *pdata = &sk->tp_pinfo.af_spx;
 
if(sk == NULL)
return (0);
if(!sk->dead)
sk->state_change(sk);
sk->dead = 1;
 
if(pdata->state != SPX_CLOSED)
{
spx_transmit(sk, NULL, DISCON, 0);
spx_close_socket(sk);
}
 
sock->sk = NULL;
sk->socket = NULL;
spx_destroy_socket(sk);
 
return (0);
}
 
/* Move a socket into listening state. */
static int spx_listen(struct socket *sock, int backlog)
{
struct sock *sk = sock->sk;
 
if(sock->state != SS_UNCONNECTED)
return (-EINVAL);
if(sock->type != SOCK_SEQPACKET)
return (-EOPNOTSUPP);
if(sk->zapped != 0)
return (-EAGAIN);
 
sk->max_ack_backlog = backlog;
if(sk->state != TCP_LISTEN)
{
sk->ack_backlog = 0;
sk->state = TCP_LISTEN;
}
sk->socket->flags |= __SO_ACCEPTCON;
 
return (0);
}
 
/* Accept a pending SPX connection */
static int spx_accept(struct socket *sock, struct socket *newsock, int flags)
{
struct sock *sk;
struct sock *newsk;
struct sk_buff *skb;
int err;
 
if(sock->sk == NULL)
return (-EINVAL);
sk = sock->sk;
 
if((sock->state != SS_UNCONNECTED) || !(sock->flags & __SO_ACCEPTCON))
return (-EINVAL);
if(sock->type != SOCK_SEQPACKET)
return (-EOPNOTSUPP);
if(sk->state != TCP_LISTEN)
return (-EINVAL);
 
cli();
do {
skb = skb_dequeue(&sk->receive_queue);
if(skb == NULL)
{
if(flags & O_NONBLOCK)
{
sti();
return (-EWOULDBLOCK);
}
interruptible_sleep_on(sk->sleep);
if(signal_pending(current))
{
sti();
return (-ERESTARTSYS);
}
}
} while (skb == NULL);
 
newsk = skb->sk;
newsk->pair = NULL;
sti();
 
err = spx_transmit(newsk, skb, CONACK, 0); /* Connection ACK */
if(err)
return (err);
 
/* Now attach up the new socket */
sock->sk = NULL;
sk->ack_backlog--;
newsock->sk = newsk;
newsk->state = TCP_ESTABLISHED;
newsk->protinfo.af_ipx.dest_addr = newsk->tp_pinfo.af_spx.dest_addr;
 
return (0);
}
 
/* Build a connection to an SPX socket */
static int spx_connect(struct socket *sock, struct sockaddr *uaddr,
int addr_len, int flags)
{
struct sock *sk = sock->sk;
struct spx_opt *pdata = &sk->tp_pinfo.af_spx;
struct sockaddr_ipx src;
struct sk_buff *skb;
int size, err;
 
size = sizeof(src);
err = ipx_operations->getname(sock, (struct sockaddr *)&src, &size, 0);
if(err)
return (err);
 
pdata->source_addr.net = src.sipx_network;
memcpy(pdata->source_addr.node, src.sipx_node, IPX_NODE_LEN);
pdata->source_addr.sock = (unsigned short)src.sipx_port;
 
err = ipx_operations->connect(sock, uaddr, addr_len, flags);
if(err)
return (err);
 
pdata->dest_addr = sk->protinfo.af_ipx.dest_addr;
pdata->state = SPX_CONNECTING;
sock->state = SS_CONNECTING;
sk->state = TCP_SYN_SENT;
 
/* Send Connection request */
err = spx_transmit(sk, NULL, CONREQ, 0);
if(err)
return (err);
 
cli();
do {
skb = skb_dequeue(&sk->receive_queue);
if(skb == NULL)
{
if(flags & O_NONBLOCK)
{
sti();
return (-EWOULDBLOCK);
}
interruptible_sleep_on(sk->sleep);
if(signal_pending(current))
{
sti();
return (-ERESTARTSYS);
}
}
} while (skb == NULL);
 
if(pdata->state == SPX_CLOSED)
{
sti();
del_timer(&pdata->watchdog);
return (-ETIMEDOUT);
}
 
sock->state = SS_CONNECTED;
sk->state = TCP_ESTABLISHED;
kfree_skb(skb);
sti();
 
return (0);
}
 
/*
* Calculate the timeout for a packet. Thankfully SPX has a large
* fudge factor (3/4 secs) and does not pay much attention to RTT.
* As we simply have a default retry time of 1*HZ and a max retry
* time of 5*HZ. Between those values we increase the timeout based
* on the number of retransmit tries.
*
* FixMe: This is quite fake, but will work for now. (JS)
*/
static inline unsigned long spx_calc_rtt(int tries)
{
if(tries < 1)
return (RETRY_TIME);
if(tries > 5)
return (MAX_RETRY_DELAY);
return (tries * HZ);
}
 
static int spx_route_skb(struct spx_opt *pdata, struct sk_buff *skb, int type)
{
struct sk_buff *skb2;
int err = 0;
 
skb = skb_unshare(skb, GFP_ATOMIC);
if(skb == NULL)
return (-ENOBUFS);
 
switch(type)
{
case (CONREQ):
case (DATA):
if(!skb_queue_empty(&pdata->retransmit_queue))
{
skb_queue_tail(&pdata->transmit_queue, skb);
return 0;
}
 
case (TQUEUE):
pdata->retransmit.expires = jiffies + spx_calc_rtt(0);
add_timer(&pdata->retransmit);
 
skb2 = skb_clone(skb, GFP_NOIO);
if(skb2 == NULL)
return -ENOBUFS;
skb_queue_tail(&pdata->retransmit_queue, skb2);
 
case (ACK):
case (CONACK):
case (WDREQ):
case (WDACK):
case (DISCON):
case (DISACK):
case (RETRAN):
default:
/* Send data */
err = ipxrtr_route_skb(skb);
if(err)
kfree_skb(skb);
}
 
return (err);
}
 
/* SPX packet transmit engine */
static int spx_transmit(struct sock *sk, struct sk_buff *skb, int type, int len)
{
struct spx_opt *pdata = &sk->tp_pinfo.af_spx;
struct ipxspxhdr *ipxh;
unsigned long flags;
int err;
 
if(skb == NULL)
{
int offset = ipx_if_offset(pdata->dest_addr.net);
int size = offset + sizeof(struct ipxspxhdr);
 
if (offset < 0) /* ENETUNREACH */
return(-ENETUNREACH);
 
save_flags(flags);
cli();
skb = sock_alloc_send_skb(sk, size, 0, &err);
if(skb == NULL) {
restore_flags(flags);
return (-ENOMEM);
}
skb_reserve(skb, offset);
skb->h.raw = skb->nh.raw = skb_put(skb,sizeof(struct ipxspxhdr));
restore_flags(flags);
}
 
/* IPX header */
ipxh = (struct ipxspxhdr *)skb->nh.raw;
ipxh->ipx.ipx_checksum = 0xFFFF;
ipxh->ipx.ipx_pktsize = htons(SPX_SYS_PKT_LEN);
ipxh->ipx.ipx_tctrl = 0;
ipxh->ipx.ipx_type = IPX_TYPE_SPX;
ipxh->ipx.ipx_dest = pdata->dest_addr;
ipxh->ipx.ipx_source = pdata->source_addr;
 
/* SPX header */
ipxh->spx.dtype = 0;
ipxh->spx.sequence = htons(pdata->sequence);
ipxh->spx.ackseq = htons(pdata->rmt_seq);
ipxh->spx.sconn = pdata->source_connid;
ipxh->spx.dconn = pdata->dest_connid;
ipxh->spx.allocseq = htons(pdata->alloc);
 
/* Reset/Set WD timer */
mod_timer(&pdata->watchdog, jiffies+VERIFY_TIMEOUT);
 
switch(type)
{
case (DATA): /* Data */
ipxh->ipx.ipx_pktsize = htons(SPX_SYS_PKT_LEN + len);
ipxh->spx.cctl = (CCTL_ACK | CCTL_EOM);
pdata->sequence++;
break;
 
case (ACK): /* ACK */
pdata->rmt_seq++;
case (WDACK): /* WD ACK */
case (CONACK): /* Connection ACK */
ipxh->spx.cctl = CCTL_SYS;
ipxh->spx.ackseq = htons(pdata->rmt_seq);
break;
 
case (CONREQ): /* Connection Request */
del_timer(&pdata->watchdog);
case (WDREQ): /* WD Request */
pdata->source_connid = htons(connids++);
pdata->dest_connid = 0xFFFF;
pdata->alloc = 3 + pdata->rmt_seq;
ipxh->spx.cctl = (CCTL_ACK | CCTL_SYS);
ipxh->spx.sconn = pdata->source_connid;
ipxh->spx.dconn = pdata->dest_connid;
ipxh->spx.allocseq = htons(pdata->alloc);
break;
 
case (DISCON): /* Informed Disconnect */
ipxh->spx.cctl = CCTL_ACK;
ipxh->spx.dtype = SPX_DTYPE_ECONN;
break;
 
case (DISACK): /* Informed Disconnect ACK */
ipxh->spx.cctl = 0;
ipxh->spx.dtype = SPX_DTYPE_ECACK;
ipxh->spx.sequence = 0;
ipxh->spx.ackseq = htons(pdata->rmt_seq++);
break;
 
default:
return (-EOPNOTSUPP);
}
 
/* Send data */
return (spx_route_skb(pdata, skb, type));
}
 
/* Check the state of the connection and send a WD request if needed. */
static void spx_watchdog(unsigned long data)
{
struct sock *sk = (struct sock*)data;
struct spx_opt *pdata = &sk->tp_pinfo.af_spx;
 
del_timer(&pdata->watchdog);
if(pdata->state == SPX_CLOSED)
return;
if(pdata->retries > pdata->max_retries)
{
spx_close_socket(sk); /* Unilateral Abort */
return;
}
 
/* Send WD request */
spx_transmit(sk, NULL, WDREQ, 0);
pdata->retries++;
 
return;
}
 
static void spx_retransmit(unsigned long data)
{
struct sock *sk = (struct sock*)data;
struct spx_opt *pdata = &sk->tp_pinfo.af_spx;
struct sk_buff *skb;
unsigned long flags;
int err;
 
del_timer(&pdata->retransmit);
if(pdata->state == SPX_CLOSED)
return;
if(pdata->retransmits > RETRY_COUNT)
{
spx_close_socket(sk); /* Unilateral Abort */
return;
}
 
/* Need to leave skb on the queue, aye the fear */
save_flags(flags);
cli();
skb = skb_peek(&pdata->retransmit_queue);
if(skb_cloned(skb))
skb = skb_copy(skb, GFP_ATOMIC);
else
skb = skb_clone(skb, GFP_ATOMIC);
restore_flags(flags);
 
pdata->retransmit.expires = jiffies + spx_calc_rtt(pdata->retransmits);
add_timer(&pdata->retransmit);
 
err = spx_route_skb(pdata, skb, RETRAN);
pdata->retransmits++;
 
return;
}
 
/* Check packet for retransmission, ConReqAck aware */
static int spx_retransmit_chk(struct spx_opt *pdata, int ackseq, int type)
{
struct ipxspxhdr *ipxh;
struct sk_buff *skb;
 
skb = skb_dequeue(&pdata->retransmit_queue);
if(!skb)
return (-ENOENT);
 
/* Check Data/ACK seq */
switch(type)
{
case ACK: /* Check Sequence, Should == 1 */
ipxh = (struct ipxspxhdr *)skb->nh.raw;
if(!(ntohs(ipxh->spx.sequence) - htons(ackseq)))
break;
 
case CONACK:
del_timer(&pdata->retransmit);
pdata->retransmits = 0;
kfree_skb(skb);
if(skb_queue_empty(&pdata->retransmit_queue))
{
skb = skb_dequeue(&pdata->transmit_queue);
if(skb != NULL)
spx_route_skb(pdata, skb, TQUEUE);
}
return (0);
}
 
skb_queue_head(&pdata->retransmit_queue, skb);
return (-1);
}
 
/* SPX packet receive engine */
void spx_rcv(struct sock *sk, int bytes)
{
struct sk_buff *skb;
struct ipxspxhdr *ipxh;
struct spx_opt *pdata = &sk->tp_pinfo.af_spx;
 
skb = skb_dequeue(&sk->receive_queue);
if(skb == NULL)
return;
ipxh = (struct ipxspxhdr *)skb->nh.raw;
 
/* Can't receive on a closed connection */
if((pdata->state == SPX_CLOSED) && (ipxh->spx.sequence != 0))
goto toss_skb;
if(ntohs(ipxh->ipx.ipx_pktsize) < SPX_SYS_PKT_LEN)
goto toss_skb;
if(ipxh->ipx.ipx_type != IPX_TYPE_SPX)
goto toss_skb;
if(ntohs(ipxh->spx.ackseq) > pdata->sequence)
goto toss_skb;
 
/* Reset WD timer on any received packet */
del_timer(&pdata->watchdog);
pdata->retries = 0;
pdata->watchdog.expires = jiffies + ABORT_TIMEOUT;
add_timer(&pdata->watchdog);
 
switch(ipxh->spx.cctl)
{
case (CCTL_SYS | CCTL_ACK):
if((ipxh->spx.sequence == 0) /* ConReq */
&& (ipxh->spx.ackseq == 0)
&& (ipxh->spx.dconn == 0xFFFF))
{
pdata->state = SPX_CONNECTED;
pdata->dest_addr = ipxh->ipx.ipx_source;
pdata->source_addr = ipxh->ipx.ipx_dest;
pdata->dest_connid = ipxh->spx.sconn;
pdata->alloc = 3 + ntohs(ipxh->spx.sequence);
 
skb_queue_tail(&sk->receive_queue, skb);
wake_up_interruptible(sk->sleep);
}
else /* WD Request */
spx_transmit(sk, skb, WDACK, 0);
goto finish;
 
case CCTL_SYS: /* ACK */
if((ipxh->spx.dtype == 0) /* ConReq ACK */
&& (ipxh->spx.sconn != 0xFFFF)
&& (ipxh->spx.dconn != 0xFFFF)
&& (ipxh->spx.sequence == 0)
&& (ipxh->spx.ackseq == 0)
&& (pdata->state != SPX_CONNECTED))
{
pdata->state = SPX_CONNECTED;
pdata->dest_connid = ipxh->spx.sconn;
 
if(spx_retransmit_chk(pdata, 0, CONACK) < 0)
goto toss_skb;
 
skb_queue_tail(&sk->receive_queue, skb);
wake_up_interruptible(sk->sleep);
goto finish;
}
 
spx_retransmit_chk(pdata, ipxh->spx.ackseq, ACK);
goto toss_skb;
 
case (CCTL_ACK):
/* Informed Disconnect */
if(ipxh->spx.dtype == SPX_DTYPE_ECONN)
{
spx_transmit(sk, skb, DISACK, 0);
spx_close_socket(sk);
goto finish;
}
/* Fall through */
 
default:
if(ntohs(ipxh->spx.sequence) == pdata->rmt_seq)
{
pdata->rmt_seq = ntohs(ipxh->spx.sequence);
pdata->rmt_ack = ntohs(ipxh->spx.ackseq);
pdata->alloc = pdata->rmt_seq + 3;
if(pdata->rmt_ack > 0 || pdata->rmt_ack == 0)
spx_retransmit_chk(pdata,pdata->rmt_ack, ACK);
 
skb_queue_tail(&pdata->rcv_queue, skb);
wake_up_interruptible(sk->sleep);
if(ipxh->spx.cctl&CCTL_ACK)
spx_transmit(sk, NULL, ACK, 0);
goto finish;
}
 
if(ipxh->spx.dtype == SPX_DTYPE_ECACK)
{
if(pdata->state != SPX_CLOSED)
spx_close_socket(sk);
goto toss_skb;
}
}
 
toss_skb: /* Catch All */
kfree_skb(skb);
finish:
return;
}
 
/* Get message/packet data from user-land */
static int spx_sendmsg(struct socket *sock, struct msghdr *msg, int len,
struct scm_cookie *scm)
{
struct sock *sk = sock->sk;
int flags = msg->msg_flags;
struct sk_buff *skb;
int err, offset, size;
 
if(len > 534)
return (-EMSGSIZE);
if(sk->zapped)
return (-ENOTCONN); /* Socket not bound */
if(flags&~MSG_DONTWAIT)
return (-EINVAL);
 
offset = ipx_if_offset(sk->tp_pinfo.af_spx.dest_addr.net);
size = offset + sizeof(struct ipxspxhdr) + len;
 
cli();
skb = sock_alloc_send_skb(sk, size, flags&MSG_DONTWAIT, &err);
sti();
if(skb == NULL)
return (err);
 
skb->sk = sk;
skb_reserve(skb, offset);
skb->h.raw = skb->nh.raw = skb_put(skb, sizeof(struct ipxspxhdr));
 
err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
if(err)
{
kfree_skb(skb);
return (-EFAULT);
}
 
err = spx_transmit(sk, skb, DATA, len);
if(err)
return (-EAGAIN);
 
return (len);
}
 
/* Send message/packet data to user-land */
static int spx_recvmsg(struct socket *sock, struct msghdr *msg, int size,
int flags, struct scm_cookie *scm)
{
struct sk_buff *skb;
struct ipxspxhdr *ispxh;
struct sock *sk = sock->sk;
struct spx_opt *pdata = &sk->tp_pinfo.af_spx;
struct sockaddr_ipx *sipx = (struct sockaddr_ipx *)msg->msg_name;
int copied, err;
 
if(sk->zapped)
return (-ENOTCONN); /* Socket not bound */
 
lock_sock(sk);
restart:
while(skb_queue_empty(&pdata->rcv_queue)) /* No data */
{
/* Socket errors? */
err = sock_error(sk);
if(err)
return (err);
 
/* Socket shut down? */
if(sk->shutdown & RCV_SHUTDOWN)
return (-ESHUTDOWN);
 
/* handle signals */
if(signal_pending(current))
return (-ERESTARTSYS);
 
/* User doesn't want to wait */
if(flags&MSG_DONTWAIT)
return (-EAGAIN);
 
release_sock(sk);
save_flags(flags);
cli();
if(skb_peek(&pdata->rcv_queue) == NULL)
interruptible_sleep_on(sk->sleep);
restore_flags(flags);
lock_sock(sk);
}
 
skb = skb_dequeue(&pdata->rcv_queue);
if(skb == NULL)
goto restart;
 
ispxh = (struct ipxspxhdr *)skb->nh.raw;
copied = ntohs(ispxh->ipx.ipx_pktsize) - SPX_SYS_PKT_LEN;
if(copied > size)
{
copied = size;
msg->msg_flags |= MSG_TRUNC;
}
 
err = memcpy_toiovec(msg->msg_iov, skb->nh.raw+SPX_SYS_PKT_LEN, copied);
if(err)
return (-EFAULT);
 
msg->msg_namelen = sizeof(*sipx);
if(sipx)
{
sipx->sipx_family = AF_IPX;
sipx->sipx_port = ispxh->ipx.ipx_source.sock;
memcpy(sipx->sipx_node,ispxh->ipx.ipx_source.node,IPX_NODE_LEN);
sipx->sipx_network = ispxh->ipx.ipx_source.net;
sipx->sipx_type = ispxh->ipx.ipx_type;
}
kfree_skb(skb);
release_sock(sk);
 
return (copied);
}
 
/*
* Functions which just wrap their IPX cousins
*/
 
static int spx_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
{
int err;
err = ipx_operations->bind(sock, uaddr, addr_len);
return (err);
}
 
static int spx_getname (struct socket *sock, struct sockaddr *uaddr,
int *usockaddr_len, int peer)
{
int err;
err = ipx_operations->getname(sock, uaddr, usockaddr_len, peer);
return (err);
}
 
static int spx_ioctl (struct socket *sock, unsigned int cmd,
unsigned long arg)
{
int err;
err = ipx_operations->ioctl(sock, cmd, arg);
return (err);
}
 
static int spx_setsockopt(struct socket *sock, int level, int optname,
char *optval, int optlen)
{
int err;
err = ipx_operations->setsockopt(sock, level, optname, optval, optlen);
return (err);
}
 
static int spx_getsockopt(struct socket *sock, int level, int optname,
char *optval, int *optlen)
{
int err;
err = ipx_operations->getsockopt(sock, level, optname, optval, optlen);
return (err);
}
 
static struct proto_ops SOCKOPS_WRAPPED(spx_ops) = {
family: PF_IPX,
 
release: spx_release,
bind: spx_bind,
connect: spx_connect,
socketpair: sock_no_socketpair,
accept: spx_accept,
getname: spx_getname,
poll: spx_datagram_poll,
ioctl: spx_ioctl,
listen: spx_listen,
shutdown: sock_no_shutdown,
setsockopt: spx_setsockopt,
getsockopt: spx_getsockopt,
sendmsg: spx_sendmsg,
recvmsg: spx_recvmsg,
mmap: sock_no_mmap,
sendpage: sock_no_sendpage,
};
 
#include <linux/smp_lock.h>
SOCKOPS_WRAP(spx, PF_IPX);
 
static struct net_proto_family spx_family_ops = {
family: PF_IPX,
create: spx_create,
};
 
static char banner[] __initdata = KERN_INFO "NET4: Sequenced Packet eXchange (SPX) 0.02 for Linux NET4.0\n";
 
static int __init spx_proto_init(void)
{
int error;
 
connids = (__u16)jiffies; /* initalize random */
 
error = ipx_register_spx(&ipx_operations, &spx_family_ops);
if (error)
printk(KERN_ERR "SPX: unable to register with IPX.\n");
 
/* route socket(PF_IPX, SOCK_SEQPACKET) calls through spx_create() */
 
printk(banner);
return 0;
}
module_init(spx_proto_init);
 
static void __exit spx_proto_finito(void)
{
ipx_unregister_spx();
return;
}
module_exit(spx_proto_finito);
/af_ipx.c
0,0 → 1,2640
/*
* Implements an IPX socket layer.
*
* This code is derived from work by
* Ross Biro : Writing the original IP stack
* Fred Van Kempen : Tidying up the TCP/IP
*
* Many thanks go to Keith Baker, Institute For Industrial Information
* Technology Ltd, Swansea University for allowing me to work on this
* in my own time even though it was in some ways related to commercial
* work I am currently employed to do there.
*
* All the material in this file is subject to the Gnu license version 2.
* Neither Alan Cox nor the Swansea University Computer Society admit
* liability nor provide warranty for any of this software. This material
* is provided as is and at no charge.
*
* Revision 0.21: Uses the new generic socket option code.
* Revision 0.22: Gcc clean ups and drop out device registration. Use the
* new multi-protocol edition of hard_header
* Revision 0.23: IPX /proc by Mark Evans. Adding a route will
* will overwrite any existing route to the same network.
* Revision 0.24: Supports new /proc with no 4K limit
* Revision 0.25: Add ephemeral sockets, passive local network
* identification, support for local net 0 and
* multiple datalinks <Greg Page>
* Revision 0.26: Device drop kills IPX routes via it. (needed for module)
* Revision 0.27: Autobind <Mark Evans>
* Revision 0.28: Small fix for multiple local networks <Thomas Winder>
* Revision 0.29: Assorted major errors removed <Mark Evans>
* Small correction to promisc mode error fix <Alan Cox>
* Asynchronous I/O support. Changed to use notifiers
* and the newer packet_type stuff. Assorted major
* fixes <Alejandro Liu>
* Revision 0.30: Moved to net/ipx/... <Alan Cox>
* Don't set address length on recvfrom that errors.
* Incorrect verify_area.
* Revision 0.31: New sk_buffs. This still needs a lot of
* testing. <Alan Cox>
* Revision 0.32: Using sock_alloc_send_skb, firewall hooks. <Alan Cox>
* Supports sendmsg/recvmsg
* Revision 0.33: Internal network support, routing changes, uses a
* protocol private area for ipx data.
* Revision 0.34: Module support. <Jim Freeman>
* Revision 0.35: Checksum support. <Neil Turton>, hooked in by <Alan Cox>
* Handles WIN95 discovery packets <Volker Lendecke>
* Revision 0.36: Internal bump up for 2.1
* Revision 0.37: Began adding POSIXisms.
* Revision 0.38: Asynchronous socket stuff made current.
* Revision 0.39: SPX interfaces
* Revision 0.40: Tiny SIOCGSTAMP fix (chris@cybernet.co.nz)
* Revision 0.41: 802.2TR removed (p.norton@computer.org)
* Fixed connecting to primary net,
* Automatic binding on send & receive,
* Martijn van Oosterhout <kleptogimp@geocities.com>
* Revision 042: Multithreading - use spinlocks and refcounting to
* protect some structures: ipx_interface sock list, list
* of ipx interfaces, etc.
* Bugfixes - do refcounting on net_devices, check function
* results, etc. Thanks to davem and freitag for
* suggestions and guidance.
* Arnaldo Carvalho de Melo <acme@conectiva.com.br>,
* November, 2000
* Revision 043: Shared SKBs, don't mangle packets, some cleanups
* Arnaldo Carvalho de Melo <acme@conectiva.com.br>,
* December, 2000
* Revision 044: Call ipxitf_hold on NETDEV_UP (acme)
* Revision 045: fix PPROP routing bug (acme)
* Revision 046: Further fixes to PPROP, ipxitf_create_internal was
* doing an unneeded MOD_INC_USE_COUNT, implement
* sysctl for ipx_pprop_broacasting, fix the ipx sysctl
* handling, making it dynamic, some cleanups, thanks to
* Petr Vandrovec for review and good suggestions. (acme)
* Revision 047: Cleanups, CodingStyle changes, move the ncp connection
* hack out of line (acme)
*
* Protect the module by a MOD_INC_USE_COUNT/MOD_DEC_USE_COUNT
* pair. Also, now usage count is managed this way
* -Count one if the auto_interface mode is on
* -Count one per configured interface
*
* Jacques Gelinas (jacques@solucorp.qc.ca)
*
*
* Portions Copyright (c) 1995 Caldera, Inc. <greg@caldera.com>
* Neither Greg Page nor Caldera, Inc. admit liability nor provide
* warranty for any of this software. This material is provided
* "AS-IS" and at no charge.
*/
 
#include <linux/config.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/in.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/timer.h>
#include <linux/string.h>
#include <linux/sockios.h>
#include <linux/net.h>
#include <linux/netdevice.h>
#include <net/ipx.h>
#include <linux/inet.h>
#include <linux/route.h>
#include <net/sock.h>
#include <asm/uaccess.h>
#include <asm/system.h>
#include <linux/fcntl.h>
#include <linux/mm.h>
#include <linux/termios.h> /* For TIOCOUTQ/INQ */
#include <linux/interrupt.h>
#include <net/p8022.h>
#include <net/psnap.h>
#include <linux/proc_fs.h>
#include <linux/stat.h>
#include <linux/init.h>
#include <linux/if_arp.h>
 
#ifdef CONFIG_SYSCTL
extern void ipx_register_sysctl(void);
extern void ipx_unregister_sysctl(void);
#else
#define ipx_register_sysctl()
#define ipx_unregister_sysctl()
#endif
 
/* Configuration Variables */
static unsigned char ipxcfg_max_hops = 16;
static char ipxcfg_auto_select_primary;
static char ipxcfg_auto_create_interfaces;
int sysctl_ipx_pprop_broadcasting = 1;
 
/* Global Variables */
static struct datalink_proto *p8022_datalink;
static struct datalink_proto *pEII_datalink;
static struct datalink_proto *p8023_datalink;
static struct datalink_proto *pSNAP_datalink;
 
static struct proto_ops ipx_dgram_ops;
 
static struct net_proto_family *spx_family_ops;
 
static ipx_route *ipx_routes;
static rwlock_t ipx_routes_lock = RW_LOCK_UNLOCKED;
 
static ipx_interface *ipx_interfaces;
static spinlock_t ipx_interfaces_lock = SPIN_LOCK_UNLOCKED;
 
static ipx_interface *ipx_primary_net;
static ipx_interface *ipx_internal_net;
 
#define IPX_SKB_CB(__skb) ((struct ipx_cb *)&((__skb)->cb[0]))
 
#undef IPX_REFCNT_DEBUG
#ifdef IPX_REFCNT_DEBUG
atomic_t ipx_sock_nr;
#endif
 
static void ipxcfg_set_auto_create(char val)
{
if (ipxcfg_auto_create_interfaces != val) {
if (val)
MOD_INC_USE_COUNT;
else
MOD_DEC_USE_COUNT;
 
ipxcfg_auto_create_interfaces = val;
}
}
 
static void ipxcfg_set_auto_select(char val)
{
ipxcfg_auto_select_primary = val;
if (val && !ipx_primary_net)
ipx_primary_net = ipx_interfaces;
}
 
static int ipxcfg_get_config_data(ipx_config_data *arg)
{
ipx_config_data vals;
 
vals.ipxcfg_auto_create_interfaces = ipxcfg_auto_create_interfaces;
vals.ipxcfg_auto_select_primary = ipxcfg_auto_select_primary;
 
return copy_to_user(arg, &vals, sizeof(vals)) ? -EFAULT : 0;
}
 
/* Handlers for the socket list. */
 
static inline void ipxitf_hold(ipx_interface *intrfc)
{
atomic_inc(&intrfc->refcnt);
}
 
static void ipxitf_down(ipx_interface *intrfc);
 
static inline void ipxitf_put(ipx_interface *intrfc)
{
if (atomic_dec_and_test(&intrfc->refcnt))
ipxitf_down(intrfc);
}
 
static void __ipxitf_down(ipx_interface *intrfc);
 
static inline void __ipxitf_put(ipx_interface *intrfc)
{
if (atomic_dec_and_test(&intrfc->refcnt))
__ipxitf_down(intrfc);
}
/*
* 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.
*/
 
void ipx_remove_socket(struct sock *sk)
{
struct sock *s;
ipx_interface *intrfc;
 
/* Determine interface with which socket is associated */
intrfc = sk->protinfo.af_ipx.intrfc;
if (!intrfc)
goto out;
 
ipxitf_hold(intrfc);
spin_lock_bh(&intrfc->if_sklist_lock);
s = intrfc->if_sklist;
if (s == sk) {
intrfc->if_sklist = s->next;
goto out_unlock;
}
 
while (s && s->next) {
if (s->next == sk) {
s->next = sk->next;
goto out_unlock;
}
s = s->next;
}
out_unlock:
spin_unlock_bh(&intrfc->if_sklist_lock);
sock_put(sk);
ipxitf_put(intrfc);
out: return;
}
 
static void ipx_destroy_socket(struct sock *sk)
{
ipx_remove_socket(sk);
skb_queue_purge(&sk->receive_queue);
#ifdef IPX_REFCNT_DEBUG
atomic_dec(&ipx_sock_nr);
printk(KERN_DEBUG "IPX socket %p released, %d are still alive\n", sk,
atomic_read(&ipx_sock_nr));
if (atomic_read(&sk->refcnt) != 1)
printk(KERN_DEBUG "Destruction sock ipx %p delayed, cnt=%d\n",
sk, atomic_read(&sk->refcnt));
#endif
sock_put(sk);
}
 
/*
* The following code is used to support IPX Interfaces (IPXITF). An
* IPX interface is defined by a physical device and a frame type.
*/
static ipx_route * ipxrtr_lookup(__u32);
 
/* ipxitf_clear_primary_net has to be called with ipx_interfaces_lock held */
 
static void ipxitf_clear_primary_net(void)
{
ipx_primary_net = ipxcfg_auto_select_primary ? ipx_interfaces : NULL;
}
 
static ipx_interface *__ipxitf_find_using_phys(struct net_device *dev,
unsigned short datalink)
{
ipx_interface *i = ipx_interfaces;
 
while (i && (i->if_dev != dev || i->if_dlink_type != datalink))
i = i->if_next;
 
return i;
}
 
static ipx_interface *ipxitf_find_using_phys(struct net_device *dev,
unsigned short datalink)
{
ipx_interface *i;
 
spin_lock_bh(&ipx_interfaces_lock);
i = __ipxitf_find_using_phys(dev, datalink);
if (i)
ipxitf_hold(i);
spin_unlock_bh(&ipx_interfaces_lock);
return i;
}
 
static ipx_interface *ipxitf_find_using_net(__u32 net)
{
ipx_interface *i;
 
spin_lock_bh(&ipx_interfaces_lock);
if (net)
for (i = ipx_interfaces; i && i->if_netnum != net;
i = i->if_next)
;
else
i = ipx_primary_net;
if (i)
ipxitf_hold(i);
spin_unlock_bh(&ipx_interfaces_lock);
 
return i;
}
 
/* Sockets are bound to a particular IPX interface. */
static void ipxitf_insert_socket(ipx_interface *intrfc, struct sock *sk)
{
ipxitf_hold(intrfc);
sock_hold(sk);
spin_lock_bh(&intrfc->if_sklist_lock);
sk->protinfo.af_ipx.intrfc = intrfc;
sk->next = NULL;
if (!intrfc->if_sklist)
intrfc->if_sklist = sk;
else {
struct sock *s = intrfc->if_sklist;
while (s->next)
s = s->next;
s->next = sk;
}
spin_unlock_bh(&intrfc->if_sklist_lock);
ipxitf_put(intrfc);
}
 
/* caller must hold intrfc->if_sklist_lock */
static struct sock *__ipxitf_find_socket(ipx_interface *intrfc,
unsigned short port)
{
struct sock *s = intrfc->if_sklist;
 
while (s && s->protinfo.af_ipx.port != port)
s = s->next;
 
return s;
}
 
/* caller must hold a reference to intrfc */
static struct sock *ipxitf_find_socket(ipx_interface *intrfc,
unsigned short port)
{
struct sock *s;
 
spin_lock_bh(&intrfc->if_sklist_lock);
s = __ipxitf_find_socket(intrfc, port);
if (s)
sock_hold(s);
spin_unlock_bh(&intrfc->if_sklist_lock);
 
return s;
}
 
#ifdef CONFIG_IPX_INTERN
static struct sock *ipxitf_find_internal_socket(ipx_interface *intrfc,
unsigned char *node, unsigned short port)
{
struct sock *s;
 
ipxitf_hold(intrfc);
spin_lock_bh(&intrfc->if_sklist_lock);
s = intrfc->if_sklist;
 
while (s) {
if (s->protinfo.af_ipx.port == port &&
!memcmp(node, s->protinfo.af_ipx.node, IPX_NODE_LEN))
break;
s = s->next;
}
spin_unlock_bh(&intrfc->if_sklist_lock);
ipxitf_put(intrfc);
 
return s;
}
#endif
 
static void ipxrtr_del_routes(ipx_interface *);
 
static void __ipxitf_down(ipx_interface *intrfc)
{
struct sock *s, *t;
 
/* Delete all routes associated with this interface */
ipxrtr_del_routes(intrfc);
 
spin_lock_bh(&intrfc->if_sklist_lock);
/* error sockets */
for (s = intrfc->if_sklist; s;) {
s->err = ENOLINK;
s->error_report(s);
s->protinfo.af_ipx.intrfc = NULL;
s->protinfo.af_ipx.port = 0;
s->zapped = 1; /* Indicates it is no longer bound */
t = s;
s = s->next;
t->next = NULL;
}
intrfc->if_sklist = NULL;
spin_unlock_bh(&intrfc->if_sklist_lock);
 
/* remove this interface from list */
if (intrfc == ipx_interfaces)
ipx_interfaces = intrfc->if_next;
else {
ipx_interface *i = ipx_interfaces;
while (i && i->if_next != intrfc)
i = i->if_next;
if (i && i->if_next == intrfc)
i->if_next = intrfc->if_next;
}
 
/* remove this interface from *special* networks */
if (intrfc == ipx_primary_net)
ipxitf_clear_primary_net();
if (intrfc == ipx_internal_net)
ipx_internal_net = NULL;
 
if (intrfc->if_dev)
dev_put(intrfc->if_dev);
kfree(intrfc);
MOD_DEC_USE_COUNT;
}
 
static void ipxitf_down(ipx_interface *intrfc)
{
spin_lock_bh(&ipx_interfaces_lock);
__ipxitf_down(intrfc);
spin_unlock_bh(&ipx_interfaces_lock);
}
 
static int ipxitf_device_event(struct notifier_block *notifier,
unsigned long event, void *ptr)
{
struct net_device *dev = ptr;
ipx_interface *i, *tmp;
 
if (event != NETDEV_DOWN && event != NETDEV_UP)
goto out;
 
spin_lock_bh(&ipx_interfaces_lock);
for (i = ipx_interfaces; i;) {
tmp = i->if_next;
if (i->if_dev == dev) {
if (event == NETDEV_UP)
ipxitf_hold(i);
else
__ipxitf_put(i);
}
i = tmp;
}
spin_unlock_bh(&ipx_interfaces_lock);
out: return NOTIFY_DONE;
}
 
static void ipxitf_def_skb_handler(struct sock *sock, struct sk_buff *skb)
{
if (sock_queue_rcv_skb(sock, skb) < 0)
kfree_skb(skb);
}
 
/*
* On input skb->sk is NULL. Nobody is charged for the memory.
*/
 
/* caller must hold a reference to intrfc */
 
#ifdef CONFIG_IPX_INTERN
static int ipxitf_demux_socket(ipx_interface *intrfc, struct sk_buff *skb,
int copy)
{
struct ipxhdr *ipx = skb->nh.ipxh;
int is_broadcast = !memcmp(ipx->ipx_dest.node, ipx_broadcast_node,
IPX_NODE_LEN);
struct sock *s;
int ret;
 
spin_lock_bh(&intrfc->if_sklist_lock);
s = intrfc->if_sklist;
 
while (s) {
if (s->protinfo.af_ipx.port == ipx->ipx_dest.sock &&
(is_broadcast || !memcmp(ipx->ipx_dest.node,
s->protinfo.af_ipx.node,
IPX_NODE_LEN))) {
/* We found a socket to which to send */
struct sk_buff *skb1;
 
if (copy) {
skb1 = skb_clone(skb, GFP_ATOMIC);
ret = -ENOMEM;
if (!skb1)
goto out;
} else {
skb1 = skb;
copy = 1; /* skb may only be used once */
}
ipxitf_def_skb_handler(s, skb1);
 
/* On an external interface, one socket can listen */
if (intrfc != ipx_internal_net)
break;
}
s = s->next;
}
 
/* skb was solely for us, and we did not make a copy, so free it. */
if (!copy)
kfree_skb(skb);
 
ret = 0;
out: spin_unlock_bh(&intrfc->if_sklist_lock);
return ret;
}
#else
static struct sock *ncp_connection_hack(ipx_interface *intrfc,
struct ipxhdr *ipx)
{
/* The packet's target is a NCP connection handler. We want to hand it
* to the correct socket directly within the kernel, so that the
* mars_nwe packet distribution process does not have to do it. Here we
* only care about NCP and BURST packets.
*
* You might call this a hack, but believe me, you do not want a
* complete NCP layer in the kernel, and this is VERY fast as well. */
struct sock *sk = NULL;
int connection = 0;
u8 *ncphdr = (u8 *)(ipx + 1);
 
if (*ncphdr == 0x22 && *(ncphdr + 1) == 0x22) /* NCP request */
connection = (((int) *(ncphdr + 5)) << 8) | (int) *(ncphdr + 3);
else if (*ncphdr == 0x77 && *(ncphdr + 1) == 0x77) /* BURST packet */
connection = (((int) *(ncphdr + 9)) << 8) | (int) *(ncphdr + 8);
 
if (connection) {
/* Now we have to look for a special NCP connection handling
* socket. Only these sockets have ipx_ncp_conn != 0, set by
* SIOCIPXNCPCONN. */
spin_lock_bh(&intrfc->if_sklist_lock);
for (sk = intrfc->if_sklist;
sk && sk->protinfo.af_ipx.ipx_ncp_conn != connection;
sk = sk->next);
if (sk)
sock_hold(sk);
spin_unlock_bh(&intrfc->if_sklist_lock);
}
return sk;
}
 
static int ipxitf_demux_socket(ipx_interface *intrfc, struct sk_buff *skb,
int copy)
{
struct ipxhdr *ipx = skb->nh.ipxh;
struct sock *sock1 = NULL, *sock2 = NULL;
struct sk_buff *skb1 = NULL, *skb2 = NULL;
int ret;
 
if (intrfc == ipx_primary_net && ntohs(ipx->ipx_dest.sock) == 0x451)
sock1 = ncp_connection_hack(intrfc, ipx);
if (!sock1)
/* No special socket found, forward the packet the normal way */
sock1 = ipxitf_find_socket(intrfc, ipx->ipx_dest.sock);
 
/*
* We need to check if there is a primary net and if
* this is addressed to one of the *SPECIAL* sockets because
* these need to be propagated to the primary net.
* The *SPECIAL* socket list contains: 0x452(SAP), 0x453(RIP) and
* 0x456(Diagnostic).
*/
 
if (ipx_primary_net && intrfc != ipx_primary_net) {
const int dsock = ntohs(ipx->ipx_dest.sock);
 
if (dsock == 0x452 || dsock == 0x453 || dsock == 0x456)
/* The appropriate thing to do here is to dup the
* packet and route to the primary net interface via
* ipxitf_send; however, we'll cheat and just demux it
* here. */
sock2 = ipxitf_find_socket(ipx_primary_net,
ipx->ipx_dest.sock);
}
 
/*
* If there is nothing to do return. The kfree will cancel any charging.
*/
if (!sock1 && !sock2) {
if (!copy)
kfree_skb(skb);
return 0;
}
 
/*
* This next segment of code is a little awkward, but it sets it up
* so that the appropriate number of copies of the SKB are made and
* that skb1 and skb2 point to it (them) so that it (they) can be
* demuxed to sock1 and/or sock2. If we are unable to make enough
* copies, we do as much as is possible.
*/
 
if (copy)
skb1 = skb_clone(skb, GFP_ATOMIC);
else
skb1 = skb;
 
ret = -ENOMEM;
if (!skb1)
goto out;
 
/* Do we need 2 SKBs? */
if (sock1 && sock2)
skb2 = skb_clone(skb1, GFP_ATOMIC);
else
skb2 = skb1;
 
if (sock1)
ipxitf_def_skb_handler(sock1, skb1);
 
ret = -ENOMEM;
if (!skb2)
goto out;
 
if (sock2)
ipxitf_def_skb_handler(sock2, skb2);
 
ret = 0;
out: if (sock1)
sock_put(sock1);
if (sock2)
sock_put(sock2);
return ret;
}
#endif /* CONFIG_IPX_INTERN */
 
static struct sk_buff *ipxitf_adjust_skbuff(ipx_interface *intrfc,
struct sk_buff *skb)
{
struct sk_buff *skb2;
int in_offset = skb->h.raw - skb->head;
int out_offset = intrfc->if_ipx_offset;
int len;
 
/* Hopefully, most cases */
if (in_offset >= out_offset)
return skb;
 
/* Need new SKB */
len = skb->len + out_offset;
skb2 = alloc_skb(len, GFP_ATOMIC);
if (skb2) {
skb_reserve(skb2, out_offset);
skb2->nh.raw = skb2->h.raw = skb_put(skb2, skb->len);
memcpy(skb2->h.raw, skb->h.raw, skb->len);
memcpy(skb2->cb, skb->cb, sizeof(skb->cb));
}
kfree_skb(skb);
return skb2;
}
 
/* caller must hold a reference to intrfc and the skb has to be unshared */
 
static int ipxitf_send(ipx_interface *intrfc, struct sk_buff *skb, char *node)
{
struct ipxhdr *ipx = skb->nh.ipxh;
struct net_device *dev = intrfc->if_dev;
struct datalink_proto *dl = intrfc->if_dlink;
char dest_node[IPX_NODE_LEN];
int send_to_wire = 1;
int addr_len;
 
ipx->ipx_tctrl = IPX_SKB_CB(skb)->ipx_tctrl;
ipx->ipx_dest.net = IPX_SKB_CB(skb)->ipx_dest_net;
ipx->ipx_source.net = IPX_SKB_CB(skb)->ipx_source_net;
 
/* see if we need to include the netnum in the route list */
if (IPX_SKB_CB(skb)->last_hop.index >= 0) {
u32 *last_hop = (u32 *)(((u8 *) skb->data) +
sizeof(struct ipxhdr) +
IPX_SKB_CB(skb)->last_hop.index *
sizeof(u32));
*last_hop = IPX_SKB_CB(skb)->last_hop.netnum;
IPX_SKB_CB(skb)->last_hop.index = -1;
}
/*
* We need to know how many skbuffs it will take to send out this
* packet to avoid unnecessary copies.
*/
if (!dl || !dev || dev->flags & IFF_LOOPBACK)
send_to_wire = 0; /* No non looped */
 
/*
* See if this should be demuxed to sockets on this interface
*
* We want to ensure the original was eaten or that we only use
* up clones.
*/
if (ipx->ipx_dest.net == intrfc->if_netnum) {
/*
* To our own node, loop and free the original.
* The internal net will receive on all node address.
*/
if (intrfc == ipx_internal_net ||
!memcmp(intrfc->if_node, node, IPX_NODE_LEN)) {
/* Don't charge sender */
skb_orphan(skb);
 
/* Will charge receiver */
return ipxitf_demux_socket(intrfc, skb, 0);
}
 
/* Broadcast, loop and possibly keep to send on. */
if (!memcmp(ipx_broadcast_node, node, IPX_NODE_LEN)) {
if (!send_to_wire)
skb_orphan(skb);
ipxitf_demux_socket(intrfc, skb, send_to_wire);
if (!send_to_wire)
goto out;
}
}
 
/*
* If the originating net is not equal to our net; this is routed
* We are still charging the sender. Which is right - the driver
* free will handle this fairly.
*/
if (ipx->ipx_source.net != intrfc->if_netnum) {
/*
* Unshare the buffer before modifying the count in
* case its a flood or tcpdump
*/
skb = skb_unshare(skb, GFP_ATOMIC);
if (!skb)
goto out;
if (++ipx->ipx_tctrl > ipxcfg_max_hops)
send_to_wire = 0;
}
 
if (!send_to_wire) {
kfree_skb(skb);
goto out;
}
 
/* Determine the appropriate hardware address */
addr_len = dev->addr_len;
if (!memcmp(ipx_broadcast_node, node, IPX_NODE_LEN))
memcpy(dest_node, dev->broadcast, addr_len);
else
memcpy(dest_node, &(node[IPX_NODE_LEN-addr_len]), addr_len);
 
/* Make any compensation for differing physical/data link size */
skb = ipxitf_adjust_skbuff(intrfc, skb);
if (!skb)
goto out;
 
/* set up data link and physical headers */
skb->dev = dev;
skb->protocol = __constant_htons(ETH_P_IPX);
dl->datalink_header(dl, skb, dest_node);
 
/* Send it out */
dev_queue_xmit(skb);
out: return 0;
}
 
static int ipxrtr_add_route(__u32, ipx_interface *, unsigned char *);
 
static int ipxitf_add_local_route(ipx_interface *intrfc)
{
return ipxrtr_add_route(intrfc->if_netnum, intrfc, NULL);
}
 
static const char * ipx_frame_name(unsigned short);
static const char * ipx_device_name(ipx_interface *);
static void ipxitf_discover_netnum(ipx_interface *intrfc, struct sk_buff *skb);
static int ipxitf_pprop(ipx_interface *intrfc, struct sk_buff *skb);
 
static int ipxitf_rcv(ipx_interface *intrfc, struct sk_buff *skb)
{
struct ipxhdr *ipx = skb->nh.ipxh;
int ret = 0;
 
ipxitf_hold(intrfc);
 
/* See if we should update our network number */
if (!intrfc->if_netnum) /* net number of intrfc not known yet */
ipxitf_discover_netnum(intrfc, skb);
IPX_SKB_CB(skb)->last_hop.index = -1;
if (ipx->ipx_type == IPX_TYPE_PPROP) {
ret = ipxitf_pprop(intrfc, skb);
if (ret)
goto out_free_skb;
}
 
/* local processing follows */
if (!IPX_SKB_CB(skb)->ipx_dest_net)
IPX_SKB_CB(skb)->ipx_dest_net = intrfc->if_netnum;
if (!IPX_SKB_CB(skb)->ipx_source_net)
IPX_SKB_CB(skb)->ipx_source_net = intrfc->if_netnum;
 
/* it doesn't make sense to route a pprop packet, there's no meaning
* in the ipx_dest_net for such packets */
if (ipx->ipx_type != IPX_TYPE_PPROP &&
intrfc->if_netnum != IPX_SKB_CB(skb)->ipx_dest_net) {
/* We only route point-to-point packets. */
if (skb->pkt_type == PACKET_HOST) {
skb = skb_unshare(skb, GFP_ATOMIC);
if (skb)
ret = ipxrtr_route_skb(skb);
goto out_intrfc;
}
 
goto out_free_skb;
}
 
/* see if we should keep it */
if (!memcmp(ipx_broadcast_node, ipx->ipx_dest.node, IPX_NODE_LEN) ||
!memcmp(intrfc->if_node, ipx->ipx_dest.node, IPX_NODE_LEN)) {
ret = ipxitf_demux_socket(intrfc, skb, 0);
goto out_intrfc;
}
 
/* we couldn't pawn it off so unload it */
out_free_skb:
kfree_skb(skb);
out_intrfc:
ipxitf_put(intrfc);
return ret;
}
 
static void ipxitf_discover_netnum(ipx_interface *intrfc, struct sk_buff *skb)
{
const struct ipx_cb *cb = IPX_SKB_CB(skb);
 
/* see if this is an intra packet: source_net == dest_net */
if (cb->ipx_source_net == cb->ipx_dest_net && cb->ipx_source_net) {
ipx_interface *i = ipxitf_find_using_net(cb->ipx_source_net);
/* NB: NetWare servers lie about their hop count so we
* dropped the test based on it. This is the best way
* to determine this is a 0 hop count packet. */
if (!i) {
intrfc->if_netnum = cb->ipx_source_net;
ipxitf_add_local_route(intrfc);
} else {
printk(KERN_WARNING "IPX: Network number collision "
"%lx\n %s %s and %s %s\n",
(unsigned long) htonl(cb->ipx_source_net),
ipx_device_name(i),
ipx_frame_name(i->if_dlink_type),
ipx_device_name(intrfc),
ipx_frame_name(intrfc->if_dlink_type));
ipxitf_put(i);
}
}
}
 
/**
* ipxitf_pprop - Process packet propagation IPX packet type 0x14, used for
* NetBIOS broadcasts
* @intrfc: IPX interface receiving this packet
* @skb: Received packet
*
* Checks if packet is valid: if its more than %IPX_MAX_PPROP_HOPS hops or if it
* is smaller than a IPX header + the room for %IPX_MAX_PPROP_HOPS hops we drop
* it, not even processing it locally, if it has exact %IPX_MAX_PPROP_HOPS we
* don't broadcast it, but process it locally. See chapter 5 of Novell's "IPX
* RIP and SAP Router Specification", Part Number 107-000029-001.
*
* If it is valid, check if we have pprop broadcasting enabled by the user,
* if not, just return zero for local processing.
*
* If it is enabled check the packet and don't broadcast it if we have already
* seen this packet.
*
* Broadcast: send it to the interfaces that aren't on the packet visited nets
* array, just after the IPX header.
*
* Returns -EINVAL for invalid packets, so that the calling function drops
* the packet without local processing. 0 if packet is to be locally processed.
*/
static int ipxitf_pprop(ipx_interface *intrfc, struct sk_buff *skb)
{
struct ipxhdr *ipx = skb->nh.ipxh;
int i, ret = -EINVAL;
ipx_interface *ifcs;
char *c;
u32 *l;
 
/* Illegal packet - too many hops or too short */
/* We decide to throw it away: no broadcasting, no local processing.
* NetBIOS unaware implementations route them as normal packets -
* tctrl <= 15, any data payload... */
if (IPX_SKB_CB(skb)->ipx_tctrl > IPX_MAX_PPROP_HOPS ||
ntohs(ipx->ipx_pktsize) < sizeof(struct ipxhdr) +
IPX_MAX_PPROP_HOPS * sizeof(u32))
goto out;
/* are we broadcasting this damn thing? */
ret = 0;
if (!sysctl_ipx_pprop_broadcasting)
goto out;
/* We do broadcast packet on the IPX_MAX_PPROP_HOPS hop, but we
* process it locally. All previous hops broadcasted it, and process it
* locally. */
if (IPX_SKB_CB(skb)->ipx_tctrl == IPX_MAX_PPROP_HOPS)
goto out;
c = ((u8 *) ipx) + sizeof(struct ipxhdr);
l = (u32 *) c;
 
/* Don't broadcast packet if already seen this net */
for (i = 0; i < IPX_SKB_CB(skb)->ipx_tctrl; i++)
if (*l++ == intrfc->if_netnum)
goto out;
 
/* < IPX_MAX_PPROP_HOPS hops && input interface not in list. Save the
* position where we will insert recvd netnum into list, later on,
* in ipxitf_send */
IPX_SKB_CB(skb)->last_hop.index = i;
IPX_SKB_CB(skb)->last_hop.netnum = intrfc->if_netnum;
/* xmit on all other interfaces... */
spin_lock_bh(&ipx_interfaces_lock);
for (ifcs = ipx_interfaces; ifcs; ifcs = ifcs->if_next) {
/* Except unconfigured interfaces */
if (!ifcs->if_netnum)
continue;
/* That aren't in the list */
if (ifcs == intrfc)
continue;
l = (__u32 *) c;
/* don't consider the last entry in the packet list,
* it is our netnum, and it is not there yet */
for (i = 0; i < IPX_SKB_CB(skb)->ipx_tctrl; i++)
if (ifcs->if_netnum == *l++)
break;
if (i == IPX_SKB_CB(skb)->ipx_tctrl) {
struct sk_buff *s = skb_copy(skb, GFP_ATOMIC);
 
if (s) {
IPX_SKB_CB(s)->ipx_dest_net = ifcs->if_netnum;
ipxrtr_route_skb(s);
}
}
}
spin_unlock_bh(&ipx_interfaces_lock);
out: return ret;
}
 
static void ipxitf_insert(ipx_interface *intrfc)
{
intrfc->if_next = NULL;
spin_lock_bh(&ipx_interfaces_lock);
if (!ipx_interfaces)
ipx_interfaces = intrfc;
else {
ipx_interface *i = ipx_interfaces;
while (i->if_next)
i = i->if_next;
i->if_next = intrfc;
}
spin_unlock_bh(&ipx_interfaces_lock);
 
if (ipxcfg_auto_select_primary && !ipx_primary_net)
ipx_primary_net = intrfc;
}
 
static ipx_interface *ipxitf_alloc(struct net_device *dev, __u32 netnum,
unsigned short dlink_type,
struct datalink_proto *dlink,
unsigned char internal, int ipx_offset)
{
ipx_interface *intrfc = kmalloc(sizeof(*intrfc), GFP_ATOMIC);
 
if (intrfc) {
intrfc->if_dev = dev;
intrfc->if_netnum = netnum;
intrfc->if_dlink_type = dlink_type;
intrfc->if_dlink = dlink;
intrfc->if_internal = internal;
intrfc->if_ipx_offset = ipx_offset;
intrfc->if_sknum = IPX_MIN_EPHEMERAL_SOCKET;
intrfc->if_sklist = NULL;
atomic_set(&intrfc->refcnt, 1);
spin_lock_init(&intrfc->if_sklist_lock);
MOD_INC_USE_COUNT;
}
 
return intrfc;
}
 
static int ipxitf_create_internal(ipx_interface_definition *idef)
{
ipx_interface *intrfc;
int ret = -EEXIST;
 
/* Only one primary network allowed */
if (ipx_primary_net)
goto out;
 
/* Must have a valid network number */
ret = -EADDRNOTAVAIL;
if (!idef->ipx_network)
goto out;
intrfc = ipxitf_find_using_net(idef->ipx_network);
ret = -EADDRINUSE;
if (intrfc) {
ipxitf_put(intrfc);
goto out;
}
intrfc = ipxitf_alloc(NULL, idef->ipx_network, 0, NULL, 1, 0);
ret = -EAGAIN;
if (!intrfc)
goto out;
memcpy((char *)&(intrfc->if_node), idef->ipx_node, IPX_NODE_LEN);
ipx_internal_net = ipx_primary_net = intrfc;
ipxitf_hold(intrfc);
ipxitf_insert(intrfc);
 
ret = ipxitf_add_local_route(intrfc);
ipxitf_put(intrfc);
out: return ret;
}
 
static int ipx_map_frame_type(unsigned char type)
{
int ret = 0;
 
switch (type) {
case IPX_FRAME_ETHERII:
ret = __constant_htons(ETH_P_IPX);
break;
case IPX_FRAME_8022:
ret = __constant_htons(ETH_P_802_2);
break;
case IPX_FRAME_SNAP:
ret = __constant_htons(ETH_P_SNAP);
break;
case IPX_FRAME_8023:
ret = __constant_htons(ETH_P_802_3);
break;
}
 
return ret;
}
 
static int ipxitf_create(ipx_interface_definition *idef)
{
struct net_device *dev;
unsigned short dlink_type = 0;
struct datalink_proto *datalink = NULL;
ipx_interface *intrfc;
int err;
 
if (idef->ipx_special == IPX_INTERNAL) {
err = ipxitf_create_internal(idef);
goto out;
}
 
err = -EEXIST;
if (idef->ipx_special == IPX_PRIMARY && ipx_primary_net)
goto out;
 
intrfc = ipxitf_find_using_net(idef->ipx_network);
err = -EADDRINUSE;
if (idef->ipx_network && intrfc) {
ipxitf_put(intrfc);
goto out;
}
 
if (intrfc)
ipxitf_put(intrfc);
 
dev = dev_get_by_name(idef->ipx_device);
err = -ENODEV;
if (!dev)
goto out;
 
switch (idef->ipx_dlink_type) {
case IPX_FRAME_TR_8022:
printk(KERN_WARNING "IPX frame type 802.2TR is "
"obsolete Use 802.2 instead.\n");
/* fall through */
case IPX_FRAME_8022:
dlink_type = __constant_htons(ETH_P_802_2);
datalink = p8022_datalink;
break;
case IPX_FRAME_ETHERII:
if (dev->type != ARPHRD_IEEE802) {
dlink_type = __constant_htons(ETH_P_IPX);
datalink = pEII_datalink;
break;
} else
printk(KERN_WARNING "IPX frame type EtherII "
"over token-ring is obsolete. Use SNAP "
"instead.\n");
/* fall through */
case IPX_FRAME_SNAP:
dlink_type = __constant_htons(ETH_P_SNAP);
datalink = pSNAP_datalink;
break;
case IPX_FRAME_8023:
dlink_type = __constant_htons(ETH_P_802_3);
datalink = p8023_datalink;
break;
case IPX_FRAME_NONE:
default:
err = -EPROTONOSUPPORT;
goto out_dev;
}
 
err = -ENETDOWN;
if (!(dev->flags & IFF_UP))
goto out_dev;
 
/* Check addresses are suitable */
err = -EINVAL;
if (dev->addr_len > IPX_NODE_LEN)
goto out_dev;
 
intrfc = ipxitf_find_using_phys(dev, dlink_type);
if (!intrfc) {
/* Ok now create */
intrfc = ipxitf_alloc(dev, idef->ipx_network, dlink_type,
datalink, 0, dev->hard_header_len +
datalink->header_length);
err = -EAGAIN;
if (!intrfc)
goto out_dev;
/* Setup primary if necessary */
if (idef->ipx_special == IPX_PRIMARY)
ipx_primary_net = intrfc;
if (!memcmp(idef->ipx_node, "\000\000\000\000\000\000",
IPX_NODE_LEN)) {
memset(intrfc->if_node, 0, IPX_NODE_LEN);
memcpy(intrfc->if_node + IPX_NODE_LEN - dev->addr_len,
dev->dev_addr, dev->addr_len);
} else
memcpy(intrfc->if_node, idef->ipx_node, IPX_NODE_LEN);
ipxitf_hold(intrfc);
ipxitf_insert(intrfc);
}
 
 
/* If the network number is known, add a route */
err = 0;
if (!intrfc->if_netnum)
goto out_intrfc;
 
err = ipxitf_add_local_route(intrfc);
out_intrfc:
ipxitf_put(intrfc);
goto out;
out_dev:
dev_put(dev);
out: return err;
}
 
static int ipxitf_delete(ipx_interface_definition *idef)
{
struct net_device *dev = NULL;
unsigned short dlink_type = 0;
ipx_interface *intrfc;
int ret = 0;
 
spin_lock_bh(&ipx_interfaces_lock);
if (idef->ipx_special == IPX_INTERNAL) {
if (ipx_internal_net) {
__ipxitf_put(ipx_internal_net);
goto out;
}
ret = -ENOENT;
goto out;
}
 
dlink_type = ipx_map_frame_type(idef->ipx_dlink_type);
ret = -EPROTONOSUPPORT;
if (!dlink_type)
goto out;
 
dev = __dev_get_by_name(idef->ipx_device);
ret = -ENODEV;
if (!dev)
goto out;
 
intrfc = __ipxitf_find_using_phys(dev, dlink_type);
ret = -EINVAL;
if (!intrfc)
goto out;
__ipxitf_put(intrfc);
 
ret = 0;
out: spin_unlock_bh(&ipx_interfaces_lock);
return ret;
}
 
static ipx_interface *ipxitf_auto_create(struct net_device *dev,
unsigned short dlink_type)
{
ipx_interface *intrfc = NULL;
struct datalink_proto *datalink;
 
if (!dev)
goto out;
 
/* Check addresses are suitable */
if (dev->addr_len > IPX_NODE_LEN)
goto out;
 
switch (htons(dlink_type)) {
case ETH_P_IPX:
datalink = pEII_datalink;
break;
 
case ETH_P_802_2:
datalink = p8022_datalink;
break;
 
case ETH_P_SNAP:
datalink = pSNAP_datalink;
break;
 
case ETH_P_802_3:
datalink = p8023_datalink;
break;
 
default:
goto out;
}
 
intrfc = ipxitf_alloc(dev, 0, dlink_type, datalink, 0,
dev->hard_header_len + datalink->header_length);
 
if (intrfc) {
memset(intrfc->if_node, 0, IPX_NODE_LEN);
memcpy((char *)&(intrfc->if_node[IPX_NODE_LEN-dev->addr_len]),
dev->dev_addr, dev->addr_len);
spin_lock_init(&intrfc->if_sklist_lock);
atomic_set(&intrfc->refcnt, 1);
ipxitf_insert(intrfc);
dev_hold(dev);
}
 
out: return intrfc;
}
 
static int ipxitf_ioctl(unsigned int cmd, void *arg)
{
struct ifreq ifr;
int val;
 
switch (cmd) {
case SIOCSIFADDR: {
struct sockaddr_ipx *sipx;
ipx_interface_definition f;
 
if (copy_from_user(&ifr, arg, sizeof(ifr)))
return -EFAULT;
 
sipx = (struct sockaddr_ipx *)&ifr.ifr_addr;
if (sipx->sipx_family != AF_IPX)
return -EINVAL;
 
f.ipx_network = sipx->sipx_network;
memcpy(f.ipx_device, ifr.ifr_name,
sizeof(f.ipx_device));
memcpy(f.ipx_node, sipx->sipx_node, IPX_NODE_LEN);
f.ipx_dlink_type = sipx->sipx_type;
f.ipx_special = sipx->sipx_special;
 
if (sipx->sipx_action == IPX_DLTITF)
return ipxitf_delete(&f);
else
return ipxitf_create(&f);
}
 
case SIOCGIFADDR: {
int err = 0;
struct sockaddr_ipx *sipx;
ipx_interface *ipxif;
struct net_device *dev;
 
if (copy_from_user(&ifr, arg, sizeof(ifr)))
return -EFAULT;
 
sipx = (struct sockaddr_ipx *)&ifr.ifr_addr;
dev = __dev_get_by_name(ifr.ifr_name);
if (!dev)
return -ENODEV;
 
ipxif = ipxitf_find_using_phys(dev, ipx_map_frame_type(sipx->sipx_type));
if (!ipxif)
return -EADDRNOTAVAIL;
 
sipx->sipx_family = AF_IPX;
sipx->sipx_network = ipxif->if_netnum;
memcpy(sipx->sipx_node, ipxif->if_node,
sizeof(sipx->sipx_node));
if (copy_to_user(arg, &ifr, sizeof(ifr)))
err = -EFAULT;
 
ipxitf_put(ipxif);
return err;
}
 
case SIOCAIPXITFCRT:
if (get_user(val, (unsigned char *) arg))
return -EFAULT;
ipxcfg_set_auto_create(val);
break;
 
case SIOCAIPXPRISLT:
if (get_user(val, (unsigned char *) arg))
return -EFAULT;
ipxcfg_set_auto_select(val);
break;
 
default:
return -EINVAL;
}
 
return 0;
}
 
/* Routing tables for the IPX socket layer. */
 
static inline void ipxrtr_hold(ipx_route *rt)
{
atomic_inc(&rt->refcnt);
}
 
static inline void ipxrtr_put(ipx_route *rt)
{
if (atomic_dec_and_test(&rt->refcnt))
kfree(rt);
}
 
static ipx_route *ipxrtr_lookup(__u32 net)
{
ipx_route *r;
 
read_lock_bh(&ipx_routes_lock);
for (r = ipx_routes; r && r->ir_net != net; r = r->ir_next)
;
if (r)
ipxrtr_hold(r);
read_unlock_bh(&ipx_routes_lock);
 
return r;
}
 
/* caller must hold a reference to intrfc */
 
static int ipxrtr_add_route(__u32 network, ipx_interface *intrfc,
unsigned char *node)
{
ipx_route *rt;
int ret;
 
/* Get a route structure; either existing or create */
rt = ipxrtr_lookup(network);
if (!rt) {
rt = kmalloc(sizeof(ipx_route), GFP_ATOMIC);
ret = -EAGAIN;
if (!rt)
goto out;
 
atomic_set(&rt->refcnt, 1);
ipxrtr_hold(rt);
write_lock_bh(&ipx_routes_lock);
rt->ir_next = ipx_routes;
ipx_routes = rt;
write_unlock_bh(&ipx_routes_lock);
} else {
ret = -EEXIST;
if (intrfc == ipx_internal_net)
goto out_put;
}
 
rt->ir_net = network;
rt->ir_intrfc = intrfc;
if (!node) {
memset(rt->ir_router_node, '\0', IPX_NODE_LEN);
rt->ir_routed = 0;
} else {
memcpy(rt->ir_router_node, node, IPX_NODE_LEN);
rt->ir_routed = 1;
}
 
ret = 0;
out_put:
ipxrtr_put(rt);
out: return ret;
}
 
static void ipxrtr_del_routes(ipx_interface *intrfc)
{
ipx_route **r, *tmp;
 
write_lock_bh(&ipx_routes_lock);
for (r = &ipx_routes; (tmp = *r) != NULL;) {
if (tmp->ir_intrfc == intrfc) {
*r = tmp->ir_next;
ipxrtr_put(tmp);
} else
r = &(tmp->ir_next);
}
write_unlock_bh(&ipx_routes_lock);
}
 
static int ipxrtr_create(ipx_route_definition *rd)
{
ipx_interface *intrfc;
int ret = -ENETUNREACH;
 
/* Find the appropriate interface */
intrfc = ipxitf_find_using_net(rd->ipx_router_network);
if (!intrfc)
goto out;
ret = ipxrtr_add_route(rd->ipx_network, intrfc, rd->ipx_router_node);
ipxitf_put(intrfc);
out: return ret;
}
 
static int ipxrtr_delete(long net)
{
ipx_route **r;
ipx_route *tmp;
int err;
 
write_lock_bh(&ipx_routes_lock);
for (r = &ipx_routes; (tmp = *r) != NULL;) {
if (tmp->ir_net == net) {
/* Directly connected; can't lose route */
err = -EPERM;
if (!tmp->ir_routed)
goto out;
 
*r = tmp->ir_next;
ipxrtr_put(tmp);
err = 0;
goto out;
}
 
r = &(tmp->ir_next);
}
err = -ENOENT;
out: write_unlock_bh(&ipx_routes_lock);
return err;
}
 
/*
* Checksum routine for IPX
*/
/* Note: We assume ipx_tctrl==0 and htons(length)==ipx_pktsize */
/* This functions should *not* mess with packet contents */
 
static __u16 ipx_cksum(struct ipxhdr *packet, int length)
{
/*
* NOTE: sum is a net byte order quantity, which optimizes the
* loop. This only works on big and little endian machines. (I
* don't know of a machine that isn't.)
*/
/* start at ipx_dest - We skip the checksum field and start with
* ipx_type before the loop, not considering ipx_tctrl in the calc */
__u16 *p = (__u16 *)&packet->ipx_dest;
__u32 i = (length >> 1) - 1; /* Number of complete words */
__u32 sum = packet->ipx_type << sizeof(packet->ipx_tctrl);
 
/* Loop through all complete words except the checksum field,
* ipx_type (accounted above) and ipx_tctrl (not used in the cksum) */
while (--i)
sum += *p++;
 
/* Add on the last part word if it exists */
if (packet->ipx_pktsize & __constant_htons(1))
sum += ntohs(0xff00) & *p;
 
/* Do final fixup */
sum = (sum & 0xffff) + (sum >> 16);
 
/* It's a pity there's no concept of carry in C */
if (sum >= 0x10000)
sum++;
 
return ~sum;
}
 
/*
* Route an outgoing frame from a socket.
*/
static int ipxrtr_route_packet(struct sock *sk, struct sockaddr_ipx *usipx,
struct iovec *iov, int len, int noblock)
{
struct sk_buff *skb;
ipx_interface *intrfc;
struct ipxhdr *ipx;
int size;
int ipx_offset;
ipx_route *rt = NULL;
int err;
 
/* Find the appropriate interface on which to send packet */
if (!usipx->sipx_network && ipx_primary_net) {
usipx->sipx_network = ipx_primary_net->if_netnum;
intrfc = ipx_primary_net;
} else {
rt = ipxrtr_lookup(usipx->sipx_network);
err = -ENETUNREACH;
if (!rt)
goto out;
intrfc = rt->ir_intrfc;
}
 
ipxitf_hold(intrfc);
ipx_offset = intrfc->if_ipx_offset;
size = sizeof(struct ipxhdr) + len + ipx_offset;
 
skb = sock_alloc_send_skb(sk, size, noblock, &err);
if (!skb)
goto out_put;
 
skb_reserve(skb, ipx_offset);
skb->sk = sk;
 
/* Fill in IPX header */
ipx = (struct ipxhdr *)skb_put(skb, sizeof(struct ipxhdr));
ipx->ipx_pktsize = htons(len + sizeof(struct ipxhdr));
IPX_SKB_CB(skb)->ipx_tctrl = 0;
ipx->ipx_type = usipx->sipx_type;
skb->h.raw = (void *)skb->nh.ipxh = ipx;
 
IPX_SKB_CB(skb)->last_hop.index = -1;
#ifdef CONFIG_IPX_INTERN
IPX_SKB_CB(skb)->ipx_source_net = sk->protinfo.af_ipx.intrfc->if_netnum;
memcpy(ipx->ipx_source.node, sk->protinfo.af_ipx.node, IPX_NODE_LEN);
#else
err = ntohs(sk->protinfo.af_ipx.port);
if (err == 0x453 || err == 0x452) {
/* RIP/SAP special handling for mars_nwe */
IPX_SKB_CB(skb)->ipx_source_net = intrfc->if_netnum;
memcpy(ipx->ipx_source.node, intrfc->if_node, IPX_NODE_LEN);
} else {
IPX_SKB_CB(skb)->ipx_source_net =
sk->protinfo.af_ipx.intrfc->if_netnum;
memcpy(ipx->ipx_source.node, sk->protinfo.af_ipx.intrfc->if_node, IPX_NODE_LEN);
}
#endif /* CONFIG_IPX_INTERN */
ipx->ipx_source.sock = sk->protinfo.af_ipx.port;
IPX_SKB_CB(skb)->ipx_dest_net = usipx->sipx_network;
memcpy(ipx->ipx_dest.node, usipx->sipx_node, IPX_NODE_LEN);
ipx->ipx_dest.sock = usipx->sipx_port;
 
err = memcpy_fromiovec(skb_put(skb, len), iov, len);
if (err) {
kfree_skb(skb);
goto out_put;
}
 
/* Apply checksum. Not allowed on 802.3 links. */
if (sk->no_check || intrfc->if_dlink_type == IPX_FRAME_8023)
ipx->ipx_checksum = 0xFFFF;
else
ipx->ipx_checksum = ipx_cksum(ipx, len + sizeof(struct ipxhdr));
 
err = ipxitf_send(intrfc, skb, (rt && rt->ir_routed) ?
rt->ir_router_node : ipx->ipx_dest.node);
out_put:
ipxitf_put(intrfc);
if (rt)
ipxrtr_put(rt);
out: return err;
}
 
/* the skb has to be unshared, we'll end up calling ipxitf_send, that'll
* modify the packet */
int ipxrtr_route_skb(struct sk_buff *skb)
{
struct ipxhdr *ipx = skb->nh.ipxh;
ipx_route *r = ipxrtr_lookup(IPX_SKB_CB(skb)->ipx_dest_net);
 
if (!r) { /* no known route */
kfree_skb(skb);
return 0;
}
 
ipxitf_hold(r->ir_intrfc);
ipxitf_send(r->ir_intrfc, skb, r->ir_routed ?
r->ir_router_node : ipx->ipx_dest.node);
ipxitf_put(r->ir_intrfc);
ipxrtr_put(r);
 
return 0;
}
 
/*
* We use a normal struct rtentry for route handling
*/
static int ipxrtr_ioctl(unsigned int cmd, void *arg)
{
struct rtentry rt; /* Use these to behave like 'other' stacks */
struct sockaddr_ipx *sg, *st;
int ret = -EFAULT;
 
if (copy_from_user(&rt, arg, sizeof(rt)))
goto out;
 
sg = (struct sockaddr_ipx *)&rt.rt_gateway;
st = (struct sockaddr_ipx *)&rt.rt_dst;
 
ret = -EINVAL;
if (!(rt.rt_flags & RTF_GATEWAY) || /* Direct routes are fixed */
sg->sipx_family != AF_IPX ||
st->sipx_family != AF_IPX)
goto out;
 
switch (cmd) {
case SIOCDELRT:
ret = ipxrtr_delete(st->sipx_network);
break;
case SIOCADDRT: {
struct ipx_route_definition f;
f.ipx_network = st->sipx_network;
f.ipx_router_network = sg->sipx_network;
memcpy(f.ipx_router_node, sg->sipx_node, IPX_NODE_LEN);
ret = ipxrtr_create(&f);
break;
}
}
 
out: return ret;
}
 
static const char *ipx_frame_name(unsigned short frame)
{
char* ret = "None";
 
switch (ntohs(frame)) {
case ETH_P_IPX: ret = "EtherII"; break;
case ETH_P_802_2: ret = "802.2"; break;
case ETH_P_SNAP: ret = "SNAP"; break;
case ETH_P_802_3: ret = "802.3"; break;
case ETH_P_TR_802_2: ret = "802.2TR"; break;
}
 
return ret;
}
 
static const char *ipx_device_name(ipx_interface *intrfc)
{
return intrfc->if_internal ? "Internal" :
intrfc->if_dev ? intrfc->if_dev->name : "Unknown";
}
 
/* Called from proc fs */
static int ipx_interface_get_info(char *buffer, char **start, off_t offset,
int length)
{
ipx_interface *i;
off_t begin = 0, pos = 0;
int len = 0;
 
/* Theory.. Keep printing in the same place until we pass offset */
 
len += sprintf(buffer, "%-11s%-15s%-9s%-11s%s", "Network",
"Node_Address", "Primary", "Device", "Frame_Type");
#ifdef IPX_REFCNT_DEBUG
len += sprintf(buffer + len, " refcnt");
#endif
strcat(buffer + len++, "\n");
spin_lock_bh(&ipx_interfaces_lock);
for (i = ipx_interfaces; i; i = i->if_next) {
len += sprintf(buffer + len, "%08lX ",
(long unsigned int) ntohl(i->if_netnum));
len += sprintf(buffer + len, "%02X%02X%02X%02X%02X%02X ",
i->if_node[0], i->if_node[1], i->if_node[2],
i->if_node[3], i->if_node[4], i->if_node[5]);
len += sprintf(buffer + len, "%-9s", i == ipx_primary_net ?
"Yes" : "No");
len += sprintf(buffer + len, "%-11s", ipx_device_name(i));
len += sprintf(buffer + len, "%-9s",
ipx_frame_name(i->if_dlink_type));
#ifdef IPX_REFCNT_DEBUG
len += sprintf(buffer + len, "%6d", atomic_read(&i->refcnt));
#endif
strcat(buffer + len++, "\n");
/* 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;
}
spin_unlock_bh(&ipx_interfaces_lock);
 
/* 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;
}
 
static int ipx_get_info(char *buffer, char **start, off_t offset, int length)
{
struct sock *s;
ipx_interface *i;
off_t begin = 0, pos = 0;
int len = 0;
 
/* Theory.. Keep printing in the same place until we pass offset */
 
#ifdef CONFIG_IPX_INTERN
len += sprintf(buffer, "%-28s%-28s%-10s%-10s%-7s%s\n", "Local_Address",
#else
len += sprintf(buffer, "%-15s%-28s%-10s%-10s%-7s%s\n", "Local_Address",
#endif /* CONFIG_IPX_INTERN */
"Remote_Address", "Tx_Queue", "Rx_Queue",
"State", "Uid");
 
spin_lock_bh(&ipx_interfaces_lock);
for (i = ipx_interfaces; i; i = i->if_next) {
ipxitf_hold(i);
spin_lock_bh(&i->if_sklist_lock);
for (s = i->if_sklist; s; s = s->next) {
#ifdef CONFIG_IPX_INTERN
len += sprintf(buffer + len,
"%08lX:%02X%02X%02X%02X%02X%02X:%04X ",
(unsigned long) htonl(s->protinfo.af_ipx.intrfc->if_netnum),
s->protinfo.af_ipx.node[0],
s->protinfo.af_ipx.node[1],
s->protinfo.af_ipx.node[2],
s->protinfo.af_ipx.node[3],
s->protinfo.af_ipx.node[4],
s->protinfo.af_ipx.node[5],
htons(s->protinfo.af_ipx.port));
#else
len += sprintf(buffer + len, "%08lX:%04X ",
(unsigned long) htonl(i->if_netnum),
htons(s->protinfo.af_ipx.port));
#endif /* CONFIG_IPX_INTERN */
if (s->state != TCP_ESTABLISHED)
len += sprintf(buffer + len, "%-28s",
"Not_Connected");
else {
len += sprintf(buffer + len,
"%08lX:%02X%02X%02X%02X%02X%02X:%04X ",
(unsigned long) htonl(s->protinfo.af_ipx.dest_addr.net),
s->protinfo.af_ipx.dest_addr.node[0],
s->protinfo.af_ipx.dest_addr.node[1],
s->protinfo.af_ipx.dest_addr.node[2],
s->protinfo.af_ipx.dest_addr.node[3],
s->protinfo.af_ipx.dest_addr.node[4],
s->protinfo.af_ipx.dest_addr.node[5],
htons(s->protinfo.af_ipx.dest_addr.sock));
}
 
len += sprintf(buffer + len, "%08X %08X ",
atomic_read(&s->wmem_alloc),
atomic_read(&s->rmem_alloc));
len += sprintf(buffer + len, "%02X %03d\n",
s->state, SOCK_INODE(s->socket)->i_uid);
 
pos = begin + len;
if (pos < offset) {
len = 0;
begin = pos;
}
 
if (pos > offset + length) /* We have dumped enough */
break;
}
spin_unlock_bh(&i->if_sklist_lock);
ipxitf_put(i);
}
spin_unlock_bh(&ipx_interfaces_lock);
 
/* The data in question runs from begin to begin+len */
*start = buffer + offset - begin;
len -= (offset - begin);
if (len > length)
len = length;
 
return len;
}
 
static int ipx_rt_get_info(char *buffer, char **start, off_t offset, int length)
{
ipx_route *rt;
off_t begin = 0, pos = 0;
int len = 0;
 
len += sprintf(buffer, "%-11s%-13s%s\n",
"Network", "Router_Net", "Router_Node");
read_lock_bh(&ipx_routes_lock);
for (rt = ipx_routes; rt; rt = rt->ir_next) {
len += sprintf(buffer + len, "%08lX ",
(long unsigned int) ntohl(rt->ir_net));
if (rt->ir_routed) {
len += sprintf(buffer + len,
"%08lX %02X%02X%02X%02X%02X%02X\n",
(long unsigned int) ntohl(rt->ir_intrfc->if_netnum),
rt->ir_router_node[0], rt->ir_router_node[1],
rt->ir_router_node[2], rt->ir_router_node[3],
rt->ir_router_node[4], rt->ir_router_node[5]);
} else {
len += sprintf(buffer + len, "%-13s%s\n",
"Directly", "Connected");
}
 
pos = begin + len;
if (pos < offset) {
len = 0;
begin = pos;
}
 
if (pos > offset + length)
break;
}
read_unlock_bh(&ipx_routes_lock);
 
*start = buffer + (offset - begin);
len -= (offset - begin);
if (len > length)
len = length;
 
return len;
}
 
/* Handling for system calls applied via the various interfaces to an IPX
* socket object. */
 
static int ipx_setsockopt(struct socket *sock, int level, int optname,
char *optval, int optlen)
{
struct sock *sk = sock->sk;
int opt;
int ret = -EINVAL;
 
if (optlen != sizeof(int))
goto out;
 
ret = -EFAULT;
if (get_user(opt, (unsigned int *)optval))
goto out;
 
ret = -ENOPROTOOPT;
if (!(level == SOL_IPX && optname == IPX_TYPE))
goto out;
 
sk->protinfo.af_ipx.type = opt;
ret = 0;
out: return ret;
}
 
static int ipx_getsockopt(struct socket *sock, int level, int optname,
char *optval, int *optlen)
{
struct sock *sk = sock->sk;
int val = 0;
int len;
int ret = -ENOPROTOOPT;
 
if (!(level == SOL_IPX && optname == IPX_TYPE))
goto out;
 
val = sk->protinfo.af_ipx.type;
 
ret = -EFAULT;
if (get_user(len, optlen))
goto out;
 
len = min_t(unsigned int, len, sizeof(int));
ret = -EINVAL;
if(len < 0)
goto out;
ret = -EFAULT;
if (put_user(len, optlen) || copy_to_user(optval, &val, len))
goto out;
 
ret = 0;
out: return ret;
}
 
static int ipx_create(struct socket *sock, int protocol)
{
int ret = -ESOCKTNOSUPPORT;
struct sock *sk;
 
switch (sock->type) {
case SOCK_DGRAM:
sk = sk_alloc(PF_IPX, GFP_KERNEL, 1);
ret = -ENOMEM;
if (!sk)
goto out;
sock->ops = &ipx_dgram_ops;
break;
 
case SOCK_SEQPACKET:
/*
* From this point on SPX sockets are handled
* by af_spx.c and the methods replaced.
*/
if (spx_family_ops) {
ret = spx_family_ops->create(sock, protocol);
goto out;
}
/* Fall through if SPX is not loaded */
case SOCK_STREAM: /* Allow higher levels to piggyback */
default:
goto out;
}
#ifdef IPX_REFCNT_DEBUG
atomic_inc(&ipx_sock_nr);
printk(KERN_DEBUG "IPX socket %p created, now we have %d alive\n", sk,
atomic_read(&ipx_sock_nr));
#endif
sock_init_data(sock, sk);
sk->destruct = NULL;
sk->no_check = 1; /* Checksum off by default */
 
MOD_INC_USE_COUNT;
ret = 0;
out: return ret;
}
 
static int ipx_release(struct socket *sock)
{
struct sock *sk = sock->sk;
 
if (!sk)
goto out;
 
if (!sk->dead)
sk->state_change(sk);
 
sk->dead = 1;
sock->sk = NULL;
ipx_destroy_socket(sk);
 
if (sock->type == SOCK_DGRAM)
MOD_DEC_USE_COUNT;
 
out: return 0;
}
 
/* caller must hold a reference to intrfc */
 
static unsigned short ipx_first_free_socketnum(ipx_interface *intrfc)
{
unsigned short socketNum = intrfc->if_sknum;
 
spin_lock_bh(&intrfc->if_sklist_lock);
 
if (socketNum < IPX_MIN_EPHEMERAL_SOCKET)
socketNum = IPX_MIN_EPHEMERAL_SOCKET;
 
while (__ipxitf_find_socket(intrfc, ntohs(socketNum)))
if (socketNum > IPX_MAX_EPHEMERAL_SOCKET)
socketNum = IPX_MIN_EPHEMERAL_SOCKET;
else
socketNum++;
 
spin_unlock_bh(&intrfc->if_sklist_lock);
intrfc->if_sknum = socketNum;
 
return ntohs(socketNum);
}
 
static int ipx_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
{
struct sock *sk = sock->sk;
ipx_interface *intrfc;
struct sockaddr_ipx *addr = (struct sockaddr_ipx *)uaddr;
int ret = -EINVAL;
 
if (!sk->zapped || addr_len != sizeof(struct sockaddr_ipx))
goto out;
 
intrfc = ipxitf_find_using_net(addr->sipx_network);
ret = -EADDRNOTAVAIL;
if (!intrfc)
goto out;
 
if (!addr->sipx_port) {
addr->sipx_port = ipx_first_free_socketnum(intrfc);
ret = -EINVAL;
if (!addr->sipx_port)
goto out_put;
}
 
/* protect IPX system stuff like routing/sap */
ret = -EACCES;
if (ntohs(addr->sipx_port) < IPX_MIN_EPHEMERAL_SOCKET &&
!capable(CAP_NET_ADMIN))
goto out_put;
 
sk->protinfo.af_ipx.port = addr->sipx_port;
 
#ifdef CONFIG_IPX_INTERN
if (intrfc == ipx_internal_net) {
/* The source address is to be set explicitly if the
* socket is to be bound on the internal network. If a
* node number 0 was specified, the default is used.
*/
 
ret = -EINVAL;
if (!memcmp(addr->sipx_node, ipx_broadcast_node, IPX_NODE_LEN))
goto out_put;
if (!memcmp(addr->sipx_node, ipx_this_node, IPX_NODE_LEN))
memcpy(sk->protinfo.af_ipx.node, intrfc->if_node,
IPX_NODE_LEN);
else
memcpy(sk->protinfo.af_ipx.node, addr->sipx_node,
IPX_NODE_LEN);
 
ret = -EADDRINUSE;
if (ipxitf_find_internal_socket(intrfc,
sk->protinfo.af_ipx.node,
sk->protinfo.af_ipx.port)) {
SOCK_DEBUG(sk,
"IPX: bind failed because port %X in use.\n",
ntohs((int)addr->sipx_port));
goto out_put;
}
} else {
/* Source addresses are easy. It must be our
* network:node pair for an interface routed to IPX
* with the ipx routing ioctl()
*/
 
memcpy(sk->protinfo.af_ipx.node, intrfc->if_node,
IPX_NODE_LEN);
 
ret = -EADDRINUSE;
if (ipxitf_find_socket(intrfc, addr->sipx_port)) {
SOCK_DEBUG(sk,
"IPX: bind failed because port %X in use.\n",
ntohs((int)addr->sipx_port));
goto out_put;
}
}
 
#else /* !def CONFIG_IPX_INTERN */
 
/* Source addresses are easy. It must be our network:node pair for
an interface routed to IPX with the ipx routing ioctl() */
 
ret = -EADDRINUSE;
if (ipxitf_find_socket(intrfc, addr->sipx_port)) {
SOCK_DEBUG(sk, "IPX: bind failed because port %X in use.\n",
ntohs((int)addr->sipx_port));
goto out_put;
}
 
#endif /* CONFIG_IPX_INTERN */
 
ipxitf_insert_socket(intrfc, sk);
sk->zapped = 0;
SOCK_DEBUG(sk, "IPX: bound socket 0x%04X.\n", ntohs(addr->sipx_port) );
 
ret = 0;
out_put:
ipxitf_put(intrfc);
out: return ret;
}
 
static int ipx_connect(struct socket *sock, struct sockaddr *uaddr,
int addr_len, int flags)
{
struct sock *sk = sock->sk;
struct sockaddr_ipx *addr;
int ret = -EINVAL;
ipx_route *rt;
 
sk->state = TCP_CLOSE;
sock->state = SS_UNCONNECTED;
 
if (addr_len != sizeof(*addr))
goto out;
addr = (struct sockaddr_ipx *)uaddr;
 
/* put the autobinding in */
if (!sk->protinfo.af_ipx.port) {
struct sockaddr_ipx uaddr;
 
uaddr.sipx_port = 0;
uaddr.sipx_network = 0;
 
#ifdef CONFIG_IPX_INTERN
ret = -ENETDOWN;
if (!sk->protinfo.af_ipx.intrfc)
goto out; /* Someone zonked the iface */
memcpy(uaddr.sipx_node, sk->protinfo.af_ipx.intrfc->if_node,
IPX_NODE_LEN);
#endif /* CONFIG_IPX_INTERN */
 
ret = ipx_bind(sock, (struct sockaddr *)&uaddr,
sizeof(struct sockaddr_ipx));
if (ret)
goto out;
}
 
/* We can either connect to primary network or somewhere
* we can route to */
rt = ipxrtr_lookup(addr->sipx_network);
ret = -ENETUNREACH;
if (!rt && !(!addr->sipx_network && ipx_primary_net))
goto out;
 
sk->protinfo.af_ipx.dest_addr.net = addr->sipx_network;
sk->protinfo.af_ipx.dest_addr.sock = addr->sipx_port;
memcpy(sk->protinfo.af_ipx.dest_addr.node,
addr->sipx_node, IPX_NODE_LEN);
sk->protinfo.af_ipx.type = addr->sipx_type;
 
if (sock->type == SOCK_DGRAM) {
sock->state = SS_CONNECTED;
sk->state = TCP_ESTABLISHED;
}
 
if (rt)
ipxrtr_put(rt);
ret = 0;
out: return ret;
}
 
 
static int ipx_getname(struct socket *sock, struct sockaddr *uaddr,
int *uaddr_len, int peer)
{
ipx_address *addr;
struct sockaddr_ipx sipx;
struct sock *sk = sock->sk;
int ret;
 
*uaddr_len = sizeof(struct sockaddr_ipx);
 
if (peer) {
ret = -ENOTCONN;
if (sk->state != TCP_ESTABLISHED)
goto out;
 
addr = &sk->protinfo.af_ipx.dest_addr;
sipx.sipx_network = addr->net;
sipx.sipx_port = addr->sock;
memcpy(sipx.sipx_node, addr->node, IPX_NODE_LEN);
} else {
if (sk->protinfo.af_ipx.intrfc) {
sipx.sipx_network =
sk->protinfo.af_ipx.intrfc->if_netnum;
#ifdef CONFIG_IPX_INTERN
memcpy(sipx.sipx_node, sk->protinfo.af_ipx.node,
IPX_NODE_LEN);
#else
memcpy(sipx.sipx_node,
sk->protinfo.af_ipx.intrfc->if_node,
IPX_NODE_LEN);
#endif /* CONFIG_IPX_INTERN */
 
} else {
sipx.sipx_network = 0;
memset(sipx.sipx_node, '\0', IPX_NODE_LEN);
}
 
sipx.sipx_port = sk->protinfo.af_ipx.port;
}
 
sipx.sipx_family = AF_IPX;
sipx.sipx_type = sk->protinfo.af_ipx.type;
memcpy(uaddr, &sipx, sizeof(sipx));
 
ret = 0;
out: return ret;
}
 
int ipx_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt)
{
/* NULL here for pt means the packet was looped back */
ipx_interface *intrfc;
struct ipxhdr *ipx;
u16 ipx_pktsize;
int ret = 0;
/* Not ours */
if (skb->pkt_type == PACKET_OTHERHOST)
goto drop;
 
if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
goto out;
 
ipx = skb->nh.ipxh;
ipx_pktsize = ntohs(ipx->ipx_pktsize);
/* Too small or invalid header? */
if (ipx_pktsize < sizeof(struct ipxhdr) || ipx_pktsize > skb->len)
goto drop;
if (ipx->ipx_checksum != IPX_NO_CHECKSUM &&
ipx->ipx_checksum != ipx_cksum(ipx, ipx_pktsize))
goto drop;
 
IPX_SKB_CB(skb)->ipx_tctrl = ipx->ipx_tctrl;
IPX_SKB_CB(skb)->ipx_dest_net = ipx->ipx_dest.net;
IPX_SKB_CB(skb)->ipx_source_net = ipx->ipx_source.net;
 
/* Determine what local ipx endpoint this is */
intrfc = ipxitf_find_using_phys(dev, pt->type);
if (!intrfc) {
if (ipxcfg_auto_create_interfaces &&
ntohl(IPX_SKB_CB(skb)->ipx_dest_net)) {
intrfc = ipxitf_auto_create(dev, pt->type);
if (intrfc)
ipxitf_hold(intrfc);
}
 
if (!intrfc) /* Not one of ours */
/* or invalid packet for auto creation */
goto drop;
}
 
ret = ipxitf_rcv(intrfc, skb);
ipxitf_put(intrfc);
goto out;
drop: kfree_skb(skb);
out: return ret;
}
 
static int ipx_sendmsg(struct socket *sock, struct msghdr *msg, int len,
struct scm_cookie *scm)
{
struct sock *sk = sock->sk;
struct sockaddr_ipx *usipx = (struct sockaddr_ipx *)msg->msg_name;
struct sockaddr_ipx local_sipx;
int ret = -EINVAL;
int flags = msg->msg_flags;
 
/* Socket gets bound below anyway */
/* if (sk->zapped)
return -EIO; */ /* Socket not bound */
if (flags & ~MSG_DONTWAIT)
goto out;
 
if (usipx) {
if (!sk->protinfo.af_ipx.port) {
struct sockaddr_ipx uaddr;
 
uaddr.sipx_port = 0;
uaddr.sipx_network = 0;
#ifdef CONFIG_IPX_INTERN
ret = -ENETDOWN;
if (!sk->protinfo.af_ipx.intrfc)
goto out; /* Someone zonked the iface */
memcpy(uaddr.sipx_node,
sk->protinfo.af_ipx.intrfc->if_node,
IPX_NODE_LEN);
#endif
ret = ipx_bind(sock, (struct sockaddr *)&uaddr,
sizeof(struct sockaddr_ipx));
if (ret)
goto out;
}
 
ret = -EINVAL;
if (msg->msg_namelen < sizeof(*usipx) ||
usipx->sipx_family != AF_IPX)
goto out;
} else {
ret = -ENOTCONN;
if (sk->state != TCP_ESTABLISHED)
goto out;
 
usipx = &local_sipx;
usipx->sipx_family = AF_IPX;
usipx->sipx_type = sk->protinfo.af_ipx.type;
usipx->sipx_port = sk->protinfo.af_ipx.dest_addr.sock;
usipx->sipx_network = sk->protinfo.af_ipx.dest_addr.net;
memcpy(usipx->sipx_node, sk->protinfo.af_ipx.dest_addr.node,
IPX_NODE_LEN);
}
 
ret = ipxrtr_route_packet(sk, usipx, msg->msg_iov, len,
flags & MSG_DONTWAIT);
if (ret >= 0)
ret = len;
out: return ret;
}
 
 
static int ipx_recvmsg(struct socket *sock, struct msghdr *msg, int size,
int flags, struct scm_cookie *scm)
{
struct sock *sk = sock->sk;
struct sockaddr_ipx *sipx = (struct sockaddr_ipx *)msg->msg_name;
struct ipxhdr *ipx = NULL;
struct sk_buff *skb;
int copied, err;
 
/* put the autobinding in */
if (!sk->protinfo.af_ipx.port) {
struct sockaddr_ipx uaddr;
 
uaddr.sipx_port = 0;
uaddr.sipx_network = 0;
 
#ifdef CONFIG_IPX_INTERN
err = -ENETDOWN;
if (!sk->protinfo.af_ipx.intrfc)
goto out; /* Someone zonked the iface */
memcpy(uaddr.sipx_node,
sk->protinfo.af_ipx.intrfc->if_node, IPX_NODE_LEN);
#endif /* CONFIG_IPX_INTERN */
 
err = ipx_bind(sock, (struct sockaddr *)&uaddr,
sizeof(struct sockaddr_ipx));
if (err)
goto out;
}
err = -ENOTCONN;
if (sk->zapped)
goto out;
 
skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
flags & MSG_DONTWAIT, &err);
if (!skb)
goto out;
 
ipx = skb->nh.ipxh;
copied = ntohs(ipx->ipx_pktsize) - sizeof(struct ipxhdr);
if (copied > size) {
copied = size;
msg->msg_flags |= MSG_TRUNC;
}
 
err = skb_copy_datagram_iovec(skb, sizeof(struct ipxhdr), msg->msg_iov,
copied);
if (err)
goto out_free;
sk->stamp = skb->stamp;
 
msg->msg_namelen = sizeof(*sipx);
 
if (sipx) {
sipx->sipx_family = AF_IPX;
sipx->sipx_port = ipx->ipx_source.sock;
memcpy(sipx->sipx_node, ipx->ipx_source.node, IPX_NODE_LEN);
sipx->sipx_network = IPX_SKB_CB(skb)->ipx_source_net;
sipx->sipx_type = ipx->ipx_type;
}
err = copied;
 
out_free:
skb_free_datagram(sk, skb);
out: return err;
}
 
 
static int ipx_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
{
long amount = 0;
struct sock *sk = sock->sk;
 
switch (cmd) {
case TIOCOUTQ:
amount = sk->sndbuf - atomic_read(&sk->wmem_alloc);
if (amount < 0)
amount = 0;
return put_user(amount, (int *)arg);
 
case TIOCINQ: {
struct sk_buff *skb = skb_peek(&sk->receive_queue);
/* These two are safe on a single CPU system as only
* user tasks fiddle here */
if (skb)
amount = skb->len - sizeof(struct ipxhdr);
return put_user(amount, (int *)arg);
}
 
case SIOCADDRT:
case SIOCDELRT:
if (!capable(CAP_NET_ADMIN))
return -EPERM;
return ipxrtr_ioctl(cmd, (void *)arg);
 
case SIOCSIFADDR:
case SIOCAIPXITFCRT:
case SIOCAIPXPRISLT:
if (!capable(CAP_NET_ADMIN))
return -EPERM;
 
case SIOCGIFADDR:
return ipxitf_ioctl(cmd, (void *)arg);
 
case SIOCIPXCFGDATA:
return ipxcfg_get_config_data((void *)arg);
 
case SIOCIPXNCPCONN:
/*
* This socket wants to take care of the NCP connection
* handed to us in arg.
*/
if (!capable(CAP_NET_ADMIN))
return -EPERM;
return get_user(sk->protinfo.af_ipx.ipx_ncp_conn,
(const unsigned short *)(arg));
 
case SIOCGSTAMP: {
int ret = -EINVAL;
if (sk) {
if (!sk->stamp.tv_sec)
return -ENOENT;
ret = -EFAULT;
if (!copy_to_user((void *)arg, &sk->stamp,
sizeof(struct timeval)))
ret = 0;
}
 
return ret;
}
 
case SIOCGIFDSTADDR:
case SIOCSIFDSTADDR:
case SIOCGIFBRDADDR:
case SIOCSIFBRDADDR:
case SIOCGIFNETMASK:
case SIOCSIFNETMASK:
return -EINVAL;
 
default:
return dev_ioctl(cmd,(void *) arg);
}
 
/*NOT REACHED*/
return 0;
}
 
/*
* SPX interface support
*/
 
int ipx_register_spx(struct proto_ops **p, struct net_proto_family *spx)
{
if (spx_family_ops)
return -EBUSY;
cli();
MOD_INC_USE_COUNT;
*p = &ipx_dgram_ops;
spx_family_ops = spx;
sti();
return 0;
}
 
int ipx_unregister_spx(void)
{
spx_family_ops = NULL;
MOD_DEC_USE_COUNT;
return 0;
}
 
/*
* Socket family declarations
*/
 
static struct net_proto_family ipx_family_ops = {
family: PF_IPX,
create: ipx_create,
};
 
static struct proto_ops SOCKOPS_WRAPPED(ipx_dgram_ops) = {
family: PF_IPX,
 
release: ipx_release,
bind: ipx_bind,
connect: ipx_connect,
socketpair: sock_no_socketpair,
accept: sock_no_accept,
getname: ipx_getname,
poll: datagram_poll,
ioctl: ipx_ioctl,
listen: sock_no_listen,
shutdown: sock_no_shutdown, /* FIXME: have to support shutdown */
setsockopt: ipx_setsockopt,
getsockopt: ipx_getsockopt,
sendmsg: ipx_sendmsg,
recvmsg: ipx_recvmsg,
mmap: sock_no_mmap,
sendpage: sock_no_sendpage,
};
 
#include <linux/smp_lock.h>
SOCKOPS_WRAP(ipx_dgram, PF_IPX);
 
static struct packet_type ipx_8023_packet_type = {
type: __constant_htons(ETH_P_802_3),
func: ipx_rcv,
data: (void *) 1, /* yap, I understand shared skbs :-) */
};
 
static struct packet_type ipx_dix_packet_type = {
type: __constant_htons(ETH_P_IPX),
func: ipx_rcv,
data: (void *) 1, /* yap, I understand shared skbs :-) */
};
 
static struct notifier_block ipx_dev_notifier = {
notifier_call: ipxitf_device_event,
};
 
 
extern struct datalink_proto *make_EII_client(void);
extern struct datalink_proto *make_8023_client(void);
extern void destroy_EII_client(struct datalink_proto *);
extern void destroy_8023_client(struct datalink_proto *);
 
static unsigned char ipx_8022_type = 0xE0;
static unsigned char ipx_snap_id[5] = { 0x0, 0x0, 0x0, 0x81, 0x37 };
static char banner[] __initdata =
KERN_INFO "NET4: Linux IPX 0.47 for NET4.0\n"
KERN_INFO "IPX Portions Copyright (c) 1995 Caldera, Inc.\n" \
KERN_INFO "IPX Portions Copyright (c) 2000, 2001 Conectiva, Inc.\n";
 
static int __init ipx_init(void)
{
sock_register(&ipx_family_ops);
 
pEII_datalink = make_EII_client();
dev_add_pack(&ipx_dix_packet_type);
 
p8023_datalink = make_8023_client();
dev_add_pack(&ipx_8023_packet_type);
 
p8022_datalink = register_8022_client(ipx_8022_type, ipx_rcv);
if (!p8022_datalink)
printk(KERN_CRIT "IPX: Unable to register with 802.2\n");
 
pSNAP_datalink = register_snap_client(ipx_snap_id, ipx_rcv);
if (!pSNAP_datalink)
printk(KERN_CRIT "IPX: Unable to register with SNAP\n");
 
register_netdevice_notifier(&ipx_dev_notifier);
ipx_register_sysctl();
#ifdef CONFIG_PROC_FS
proc_net_create("ipx", 0, ipx_get_info);
proc_net_create("ipx_interface", 0, ipx_interface_get_info);
proc_net_create("ipx_route", 0, ipx_rt_get_info);
#endif
printk(banner);
return 0;
}
 
module_init(ipx_init);
 
/* Higher layers need this info to prep tx pkts */
int ipx_if_offset(unsigned long ipx_net_number)
{
ipx_route *rt = ipxrtr_lookup(ipx_net_number);
int ret = -ENETUNREACH;
 
if (!rt)
goto out;
ret = rt->ir_intrfc->if_ipx_offset;
ipxrtr_put(rt);
out: return ret;
}
 
/* Export symbols for higher layers */
EXPORT_SYMBOL(ipxrtr_route_skb);
EXPORT_SYMBOL(ipx_if_offset);
EXPORT_SYMBOL(ipx_remove_socket);
EXPORT_SYMBOL(ipx_register_spx);
EXPORT_SYMBOL(ipx_unregister_spx);
 
/* Note on MOD_{INC,DEC}_USE_COUNT:
*
* Use counts are incremented/decremented when
* sockets are created/deleted.
*
* Routes are always associated with an interface, and
* allocs/frees will remain properly accounted for by
* their associated interfaces.
*
* Ergo, before the ipx module can be removed, all IPX
* sockets be closed from user space.
*/
 
static void __exit ipx_proto_finito(void)
{
/* no need to worry about having anything on the ipx_interfaces
* list, when a interface is created we increment the module
* usage count, so the module will only be unloaded when there
* are no more interfaces */
 
proc_net_remove("ipx_route");
proc_net_remove("ipx_interface");
proc_net_remove("ipx");
ipx_unregister_sysctl();
 
unregister_netdevice_notifier(&ipx_dev_notifier);
 
unregister_snap_client(ipx_snap_id);
pSNAP_datalink = NULL;
 
unregister_8022_client(ipx_8022_type);
p8022_datalink = NULL;
 
dev_remove_pack(&ipx_8023_packet_type);
destroy_8023_client(p8023_datalink);
p8023_datalink = NULL;
 
dev_remove_pack(&ipx_dix_packet_type);
destroy_EII_client(pEII_datalink);
pEII_datalink = NULL;
 
sock_unregister(ipx_family_ops.family);
}
 
module_exit(ipx_proto_finito);
MODULE_LICENSE("GPL");
/sysctl_net_ipx.c
0,0 → 1,47
/* -*- linux-c -*-
* sysctl_net_ipx.c: sysctl interface to net IPX subsystem.
*
* Begun April 1, 1996, Mike Shaver.
* Added /proc/sys/net/ipx directory entry (empty =) ). [MS]
* Added /proc/sys/net/ipx/ipx_pprop_broadcasting - acme March 4, 2001
*/
 
#include <linux/config.h>
#include <linux/mm.h>
#include <linux/sysctl.h>
 
#ifndef CONFIG_SYSCTL
#error This file should not be compiled without CONFIG_SYSCTL defined
#endif
 
/* From af_ipx.c */
extern int sysctl_ipx_pprop_broadcasting;
 
ctl_table ipx_table[] = {
{ NET_IPX_PPROP_BROADCASTING, "ipx_pprop_broadcasting",
&sysctl_ipx_pprop_broadcasting, sizeof(int), 0644, NULL,
&proc_dointvec },
{ 0 }
};
 
static ctl_table ipx_dir_table[] = {
{ NET_IPX, "ipx", NULL, 0, 0555, ipx_table },
{ 0 }
};
 
static ctl_table ipx_root_table[] = {
{ CTL_NET, "net", NULL, 0, 0555, ipx_dir_table },
{ 0 }
};
 
static struct ctl_table_header *ipx_table_header;
 
void ipx_register_sysctl(void)
{
ipx_table_header = register_sysctl_table(ipx_root_table, 1);
}
 
void ipx_unregister_sysctl(void)
{
unregister_sysctl_table(ipx_table_header);
}
/Config.in
0,0 → 1,8
#
# IPX configuration
#
 
bool ' IPX: Full internal IPX network' CONFIG_IPX_INTERN
#if [ "$CONFIG_EXPERIMENTAL" = "y" ]; then
# dep_tristate ' IPX: SPX networking (EXPERIMENTAL)' CONFIG_SPX $CONFIG_IPX
#fi
/Makefile
0,0 → 1,25
#
# Makefile for the Linux IPX layer.
#
# Note! Dependencies are done automagically by 'make dep', which also
# removes any old dependencies. DON'T put your own dependencies here
# unless it's something special (ie not a .c file).
#
# Note 2! The CFLAGS definition is now in the main makefile...
 
# We only get in/to here if CONFIG_IPX = 'y' or 'm'
 
O_TARGET := ipx.o
 
export-objs = af_ipx.o af_spx.o
 
obj-y := af_ipx.o
 
ifeq ($(CONFIG_IPX),m)
obj-m += $(O_TARGET)
endif
 
obj-$(CONFIG_SYSCTL) += sysctl_net_ipx.o
obj-$(CONFIG_SPX) += af_spx.o
 
include $(TOPDIR)/Rules.make

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