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  • This comparison shows the changes necessary to convert path 
    /or1k/trunk/linux/linux-2.4/net/econet
    from Rev 1275 to Rev 1765
    ↔ Reverse comparison
  •

Rev 1275 → Rev 1765

/af_econet.c
0,0 → 1,1137
/*
* An implementation of the Acorn Econet and AUN protocols.
* Philip Blundell <philb@gnu.org>
*
* 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.
*
*/
 
#include <linux/config.h>
#include <linux/module.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/netdevice.h>
#include <linux/inetdevice.h>
#include <linux/route.h>
#include <linux/inet.h>
#include <linux/etherdevice.h>
#include <linux/if_arp.h>
#include <linux/wireless.h>
#include <linux/skbuff.h>
#include <net/sock.h>
#include <net/inet_common.h>
#include <linux/stat.h>
#include <linux/init.h>
#include <linux/if_ec.h>
#include <net/udp.h>
#include <net/ip.h>
#include <linux/spinlock.h>
 
#include <asm/uaccess.h>
#include <asm/system.h>
#include <asm/bitops.h>
 
static struct proto_ops econet_ops;
static struct sock *econet_sklist;
 
/* Since there are only 256 possible network numbers (or fewer, depends
how you count) it makes sense to use a simple lookup table. */
static struct net_device *net2dev_map[256];
 
#define EC_PORT_IP 0xd2
 
#ifdef CONFIG_ECONET_AUNUDP
static spinlock_t aun_queue_lock;
static struct socket *udpsock;
#define AUN_PORT 0x8000
 
 
struct aunhdr
{
unsigned char code; /* AUN magic protocol byte */
unsigned char port;
unsigned char cb;
unsigned char pad;
unsigned long handle;
};
 
static unsigned long aun_seq;
 
/* Queue of packets waiting to be transmitted. */
static struct sk_buff_head aun_queue;
static struct timer_list ab_cleanup_timer;
 
#endif /* CONFIG_ECONET_AUNUDP */
 
/* Per-packet information */
struct ec_cb
{
struct sockaddr_ec sec;
unsigned long cookie; /* Supplied by user. */
#ifdef CONFIG_ECONET_AUNUDP
int done;
unsigned long seq; /* Sequencing */
unsigned long timeout; /* Timeout */
unsigned long start; /* jiffies */
#endif
#ifdef CONFIG_ECONET_NATIVE
void (*sent)(struct sk_buff *, int result);
#endif
};
 
/*
* Pull a packet from our receive queue and hand it to the user.
* If necessary we block.
*/
 
static int econet_recvmsg(struct socket *sock, struct msghdr *msg, int len,
int flags, struct scm_cookie *scm)
{
struct sock *sk = sock->sk;
struct sk_buff *skb;
int copied, err;
 
msg->msg_namelen = sizeof(struct sockaddr_ec);
 
/*
* Call the generic datagram receiver. This handles all sorts
* of horrible races and re-entrancy so we can forget about it
* in the protocol layers.
*
* Now it will return ENETDOWN, if device have just gone down,
* but then it will block.
*/
 
skb=skb_recv_datagram(sk,flags,flags&MSG_DONTWAIT,&err);
 
/*
* An error occurred so return it. Because skb_recv_datagram()
* handles the blocking we don't see and worry about blocking
* retries.
*/
 
if(skb==NULL)
goto out;
 
/*
* You lose any data beyond the buffer you gave. If it worries a
* user program they can ask the device for its MTU anyway.
*/
 
copied = skb->len;
if (copied > len)
{
copied=len;
msg->msg_flags|=MSG_TRUNC;
}
 
/* We can't use skb_copy_datagram here */
err = memcpy_toiovec(msg->msg_iov, skb->data, copied);
if (err)
goto out_free;
sk->stamp=skb->stamp;
 
if (msg->msg_name)
memcpy(msg->msg_name, skb->cb, msg->msg_namelen);
 
/*
* Free or return the buffer as appropriate. Again this
* hides all the races and re-entrancy issues from us.
*/
err = copied;
 
out_free:
skb_free_datagram(sk, skb);
out:
return err;
}
 
/*
* Bind an Econet socket.
*/
 
static int econet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
{
struct sockaddr_ec *sec = (struct sockaddr_ec *)uaddr;
struct sock *sk=sock->sk;
/*
* Check legality
*/
if (addr_len < sizeof(struct sockaddr_ec) ||
sec->sec_family != AF_ECONET)
return -EINVAL;
sk->protinfo.af_econet->cb = sec->cb;
sk->protinfo.af_econet->port = sec->port;
sk->protinfo.af_econet->station = sec->addr.station;
sk->protinfo.af_econet->net = sec->addr.net;
 
return 0;
}
 
/*
* Queue a transmit result for the user to be told about.
*/
 
static void tx_result(struct sock *sk, unsigned long cookie, int result)
{
struct sk_buff *skb = alloc_skb(0, GFP_ATOMIC);
struct ec_cb *eb;
struct sockaddr_ec *sec;
 
if (skb == NULL)
{
printk(KERN_DEBUG "ec: memory squeeze, transmit result dropped.\n");
return;
}
 
eb = (struct ec_cb *)&skb->cb;
sec = (struct sockaddr_ec *)&eb->sec;
memset(sec, 0, sizeof(struct sockaddr_ec));
sec->cookie = cookie;
sec->type = ECTYPE_TRANSMIT_STATUS | result;
sec->sec_family = AF_ECONET;
 
if (sock_queue_rcv_skb(sk, skb) < 0)
kfree_skb(skb);
}
 
#ifdef CONFIG_ECONET_NATIVE
/*
* Called by the Econet hardware driver when a packet transmit
* has completed. Tell the user.
*/
 
static void ec_tx_done(struct sk_buff *skb, int result)
{
struct ec_cb *eb = (struct ec_cb *)&skb->cb;
tx_result(skb->sk, eb->cookie, result);
}
#endif
 
/*
* Send a packet. We have to work out which device it's going out on
* and hence whether to use real Econet or the UDP emulation.
*/
 
static int econet_sendmsg(struct socket *sock, struct msghdr *msg, int len,
struct scm_cookie *scm)
{
struct sock *sk = sock->sk;
struct sockaddr_ec *saddr=(struct sockaddr_ec *)msg->msg_name;
struct net_device *dev;
struct ec_addr addr;
int err;
unsigned char port, cb;
struct sk_buff *skb;
struct ec_cb *eb;
#ifdef CONFIG_ECONET_NATIVE
unsigned short proto = 0;
#endif
#ifdef CONFIG_ECONET_AUNUDP
struct msghdr udpmsg;
struct iovec iov[msg->msg_iovlen+1];
struct aunhdr ah;
struct sockaddr_in udpdest;
__kernel_size_t size;
int i;
mm_segment_t oldfs;
#endif
/*
* Check the flags.
*/
 
if (msg->msg_flags&~MSG_DONTWAIT)
return(-EINVAL);
 
/*
* Get and verify the address.
*/
if (saddr == NULL) {
addr.station = sk->protinfo.af_econet->station;
addr.net = sk->protinfo.af_econet->net;
port = sk->protinfo.af_econet->port;
cb = sk->protinfo.af_econet->cb;
} else {
if (msg->msg_namelen < sizeof(struct sockaddr_ec))
return -EINVAL;
addr.station = saddr->addr.station;
addr.net = saddr->addr.net;
port = saddr->port;
cb = saddr->cb;
}
 
/* Look for a device with the right network number. */
dev = net2dev_map[addr.net];
 
/* If not directly reachable, use some default */
if (dev == NULL)
{
dev = net2dev_map[0];
/* No interfaces at all? */
if (dev == NULL)
return -ENETDOWN;
}
 
if (dev->type == ARPHRD_ECONET)
{
/* Real hardware Econet. We're not worthy etc. */
#ifdef CONFIG_ECONET_NATIVE
atomic_inc(&dev->refcnt);
skb = sock_alloc_send_skb(sk, len+dev->hard_header_len+15,
msg->msg_flags & MSG_DONTWAIT, &err);
if (skb==NULL)
goto out_unlock;
skb_reserve(skb, (dev->hard_header_len+15)&~15);
skb->nh.raw = skb->data;
eb = (struct ec_cb *)&skb->cb;
/* BUG: saddr may be NULL */
eb->cookie = saddr->cookie;
eb->sec = *saddr;
eb->sent = ec_tx_done;
 
if (dev->hard_header) {
int res;
struct ec_framehdr *fh;
err = -EINVAL;
res = dev->hard_header(skb, dev, ntohs(proto),
&addr, NULL, len);
/* Poke in our control byte and
port number. Hack, hack. */
fh = (struct ec_framehdr *)(skb->data);
fh->cb = cb;
fh->port = port;
if (sock->type != SOCK_DGRAM) {
skb->tail = skb->data;
skb->len = 0;
} else if (res < 0)
goto out_free;
}
/* Copy the data. Returns -EFAULT on error */
err = memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len);
skb->protocol = proto;
skb->dev = dev;
skb->priority = sk->priority;
if (err)
goto out_free;
err = -ENETDOWN;
if (!(dev->flags & IFF_UP))
goto out_free;
/*
* Now send it
*/
dev_queue_xmit(skb);
dev_put(dev);
return(len);
 
out_free:
kfree_skb(skb);
out_unlock:
if (dev)
dev_put(dev);
#else
err = -EPROTOTYPE;
#endif
return err;
}
 
#ifdef CONFIG_ECONET_AUNUDP
/* AUN virtual Econet. */
 
if (udpsock == NULL)
return -ENETDOWN; /* No socket - can't send */
/* Make up a UDP datagram and hand it off to some higher intellect. */
 
memset(&udpdest, 0, sizeof(udpdest));
udpdest.sin_family = AF_INET;
udpdest.sin_port = htons(AUN_PORT);
 
/* At the moment we use the stupid Acorn scheme of Econet address
y.x maps to IP a.b.c.x. This should be replaced with something
more flexible and more aware of subnet masks. */
{
struct in_device *idev = in_dev_get(dev);
unsigned long network = 0;
if (idev) {
read_lock(&idev->lock);
if (idev->ifa_list)
network = ntohl(idev->ifa_list->ifa_address) &
0xffffff00; /* !!! */
read_unlock(&idev->lock);
in_dev_put(idev);
}
udpdest.sin_addr.s_addr = htonl(network | addr.station);
}
 
ah.port = port;
ah.cb = cb & 0x7f;
ah.code = 2; /* magic */
ah.pad = 0;
 
/* tack our header on the front of the iovec */
size = sizeof(struct aunhdr);
iov[0].iov_base = (void *)&ah;
iov[0].iov_len = size;
for (i = 0; i < msg->msg_iovlen; i++) {
void *base = msg->msg_iov[i].iov_base;
size_t len = msg->msg_iov[i].iov_len;
/* Check it now since we switch to KERNEL_DS later. */
if ((err = verify_area(VERIFY_READ, base, len)) < 0)
return err;
iov[i+1].iov_base = base;
iov[i+1].iov_len = len;
size += len;
}
 
/* Get a skbuff (no data, just holds our cb information) */
if ((skb = sock_alloc_send_skb(sk, 0,
msg->msg_flags & MSG_DONTWAIT, &err)) == NULL)
return err;
 
eb = (struct ec_cb *)&skb->cb;
 
eb->cookie = saddr->cookie;
eb->timeout = (5*HZ);
eb->start = jiffies;
ah.handle = aun_seq;
eb->seq = (aun_seq++);
eb->sec = *saddr;
 
skb_queue_tail(&aun_queue, skb);
 
udpmsg.msg_name = (void *)&udpdest;
udpmsg.msg_namelen = sizeof(udpdest);
udpmsg.msg_iov = &iov[0];
udpmsg.msg_iovlen = msg->msg_iovlen + 1;
udpmsg.msg_control = NULL;
udpmsg.msg_controllen = 0;
udpmsg.msg_flags=0;
 
oldfs = get_fs(); set_fs(KERNEL_DS); /* More privs :-) */
err = sock_sendmsg(udpsock, &udpmsg, size);
set_fs(oldfs);
#else
err = -EPROTOTYPE;
#endif
return err;
}
 
/*
* Look up the address of a socket.
*/
 
static int econet_getname(struct socket *sock, struct sockaddr *uaddr,
int *uaddr_len, int peer)
{
struct sock *sk = sock->sk;
struct sockaddr_ec *sec = (struct sockaddr_ec *)uaddr;
 
if (peer)
return -EOPNOTSUPP;
 
sec->sec_family = AF_ECONET;
sec->port = sk->protinfo.af_econet->port;
sec->addr.station = sk->protinfo.af_econet->station;
sec->addr.net = sk->protinfo.af_econet->net;
 
*uaddr_len = sizeof(*sec);
return 0;
}
 
static void econet_destroy_timer(unsigned long data)
{
struct sock *sk=(struct sock *)data;
 
if (!atomic_read(&sk->wmem_alloc) && !atomic_read(&sk->rmem_alloc)) {
sk_free(sk);
MOD_DEC_USE_COUNT;
return;
}
 
sk->timer.expires=jiffies+10*HZ;
add_timer(&sk->timer);
printk(KERN_DEBUG "econet socket destroy delayed\n");
}
 
/*
* Close an econet socket.
*/
 
static int econet_release(struct socket *sock)
{
struct sock *sk = sock->sk;
 
if (!sk)
return 0;
 
sklist_remove_socket(&econet_sklist, sk);
 
/*
* Now the socket is dead. No more input will appear.
*/
 
sk->state_change(sk); /* It is useless. Just for sanity. */
 
sock->sk = NULL;
sk->socket = NULL;
sk->dead = 1;
 
/* Purge queues */
 
skb_queue_purge(&sk->receive_queue);
 
if (atomic_read(&sk->rmem_alloc) || atomic_read(&sk->wmem_alloc)) {
sk->timer.data=(unsigned long)sk;
sk->timer.expires=jiffies+HZ;
sk->timer.function=econet_destroy_timer;
add_timer(&sk->timer);
return 0;
}
 
sk_free(sk);
MOD_DEC_USE_COUNT;
return 0;
}
 
/*
* Create an Econet socket
*/
 
static int econet_create(struct socket *sock, int protocol)
{
struct sock *sk;
int err;
 
/* Econet only provides datagram services. */
if (sock->type != SOCK_DGRAM)
return -ESOCKTNOSUPPORT;
 
sock->state = SS_UNCONNECTED;
MOD_INC_USE_COUNT;
 
err = -ENOBUFS;
sk = sk_alloc(PF_ECONET, GFP_KERNEL, 1);
if (sk == NULL)
goto out;
 
sk->reuse = 1;
sock->ops = &econet_ops;
sock_init_data(sock,sk);
 
sk->protinfo.af_econet = kmalloc(sizeof(struct econet_opt), GFP_KERNEL);
if (sk->protinfo.af_econet == NULL)
goto out_free;
memset(sk->protinfo.af_econet, 0, sizeof(struct econet_opt));
sk->zapped=0;
sk->family = PF_ECONET;
sk->num = protocol;
 
sklist_insert_socket(&econet_sklist, sk);
return(0);
 
out_free:
sk_free(sk);
out:
MOD_DEC_USE_COUNT;
return err;
}
 
/*
* Handle Econet specific ioctls
*/
 
static int ec_dev_ioctl(struct socket *sock, unsigned int cmd, void *arg)
{
struct ifreq ifr;
struct ec_device *edev;
struct net_device *dev;
struct sockaddr_ec *sec;
 
/*
* Fetch the caller's info block into kernel space
*/
 
if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
return -EFAULT;
 
if ((dev = dev_get_by_name(ifr.ifr_name)) == NULL)
return -ENODEV;
 
sec = (struct sockaddr_ec *)&ifr.ifr_addr;
 
switch (cmd)
{
case SIOCSIFADDR:
edev = dev->ec_ptr;
if (edev == NULL)
{
/* Magic up a new one. */
edev = kmalloc(sizeof(struct ec_device), GFP_KERNEL);
if (edev == NULL) {
printk("af_ec: memory squeeze.\n");
dev_put(dev);
return -ENOMEM;
}
memset(edev, 0, sizeof(struct ec_device));
dev->ec_ptr = edev;
}
else
net2dev_map[edev->net] = NULL;
edev->station = sec->addr.station;
edev->net = sec->addr.net;
net2dev_map[sec->addr.net] = dev;
if (!net2dev_map[0])
net2dev_map[0] = dev;
dev_put(dev);
return 0;
 
case SIOCGIFADDR:
edev = dev->ec_ptr;
if (edev == NULL)
{
dev_put(dev);
return -ENODEV;
}
memset(sec, 0, sizeof(struct sockaddr_ec));
sec->addr.station = edev->station;
sec->addr.net = edev->net;
sec->sec_family = AF_ECONET;
dev_put(dev);
if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
return -EFAULT;
return 0;
}
 
dev_put(dev);
return -EINVAL;
}
 
/*
* Handle generic ioctls
*/
 
static int econet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
{
struct sock *sk = sock->sk;
int pid;
 
switch(cmd)
{
case FIOSETOWN:
case SIOCSPGRP:
if (get_user(pid, (int *) arg))
return -EFAULT;
if (current->pid != pid && current->pgrp != -pid && !capable(CAP_NET_ADMIN))
return -EPERM;
sk->proc = pid;
return(0);
case FIOGETOWN:
case SIOCGPGRP:
return put_user(sk->proc, (int *)arg);
case SIOCGSTAMP:
if(sk->stamp.tv_sec==0)
return -ENOENT;
return copy_to_user((void *)arg, &sk->stamp, sizeof(struct timeval)) ? -EFAULT : 0;
case SIOCGIFFLAGS:
case SIOCSIFFLAGS:
case SIOCGIFCONF:
case SIOCGIFMETRIC:
case SIOCSIFMETRIC:
case SIOCGIFMEM:
case SIOCSIFMEM:
case SIOCGIFMTU:
case SIOCSIFMTU:
case SIOCSIFLINK:
case SIOCGIFHWADDR:
case SIOCSIFHWADDR:
case SIOCSIFMAP:
case SIOCGIFMAP:
case SIOCSIFSLAVE:
case SIOCGIFSLAVE:
case SIOCGIFINDEX:
case SIOCGIFNAME:
case SIOCGIFCOUNT:
case SIOCSIFHWBROADCAST:
return(dev_ioctl(cmd,(void *) arg));
 
case SIOCSIFADDR:
case SIOCGIFADDR:
return ec_dev_ioctl(sock, cmd, (void *)arg);
break;
 
default:
return(dev_ioctl(cmd,(void *) arg));
}
/*NOTREACHED*/
return 0;
}
 
static struct net_proto_family econet_family_ops = {
family: PF_ECONET,
create: econet_create,
};
 
static struct proto_ops SOCKOPS_WRAPPED(econet_ops) = {
family: PF_ECONET,
 
release: econet_release,
bind: econet_bind,
connect: sock_no_connect,
socketpair: sock_no_socketpair,
accept: sock_no_accept,
getname: econet_getname,
poll: datagram_poll,
ioctl: econet_ioctl,
listen: sock_no_listen,
shutdown: sock_no_shutdown,
setsockopt: sock_no_setsockopt,
getsockopt: sock_no_getsockopt,
sendmsg: econet_sendmsg,
recvmsg: econet_recvmsg,
mmap: sock_no_mmap,
sendpage: sock_no_sendpage,
};
 
#include <linux/smp_lock.h>
SOCKOPS_WRAP(econet, PF_ECONET);
 
/*
* Find the listening socket, if any, for the given data.
*/
 
static struct sock *ec_listening_socket(unsigned char port, unsigned char
station, unsigned char net)
{
struct sock *sk = econet_sklist;
 
while (sk)
{
struct econet_opt *opt = sk->protinfo.af_econet;
if ((opt->port == port || opt->port == 0) &&
(opt->station == station || opt->station == 0) &&
(opt->net == net || opt->net == 0))
return sk;
 
sk = sk->next;
}
 
return NULL;
}
 
/*
* Queue a received packet for a socket.
*/
 
static int ec_queue_packet(struct sock *sk, struct sk_buff *skb,
unsigned char stn, unsigned char net,
unsigned char cb, unsigned char port)
{
struct ec_cb *eb = (struct ec_cb *)&skb->cb;
struct sockaddr_ec *sec = (struct sockaddr_ec *)&eb->sec;
 
memset(sec, 0, sizeof(struct sockaddr_ec));
sec->sec_family = AF_ECONET;
sec->type = ECTYPE_PACKET_RECEIVED;
sec->port = port;
sec->cb = cb;
sec->addr.net = net;
sec->addr.station = stn;
 
return sock_queue_rcv_skb(sk, skb);
}
 
#ifdef CONFIG_ECONET_AUNUDP
 
/*
* Send an AUN protocol response.
*/
 
static void aun_send_response(__u32 addr, unsigned long seq, int code, int cb)
{
struct sockaddr_in sin;
struct iovec iov;
struct aunhdr ah;
struct msghdr udpmsg;
int err;
mm_segment_t oldfs;
memset(&sin, 0, sizeof(sin));
sin.sin_family = AF_INET;
sin.sin_port = htons(AUN_PORT);
sin.sin_addr.s_addr = addr;
 
ah.code = code;
ah.pad = 0;
ah.port = 0;
ah.cb = cb;
ah.handle = seq;
 
iov.iov_base = (void *)&ah;
iov.iov_len = sizeof(ah);
 
udpmsg.msg_name = (void *)&sin;
udpmsg.msg_namelen = sizeof(sin);
udpmsg.msg_iov = &iov;
udpmsg.msg_iovlen = 1;
udpmsg.msg_control = NULL;
udpmsg.msg_controllen = 0;
udpmsg.msg_flags=0;
 
oldfs = get_fs(); set_fs(KERNEL_DS);
err = sock_sendmsg(udpsock, &udpmsg, sizeof(ah));
set_fs(oldfs);
}
 
 
/*
* Handle incoming AUN packets. Work out if anybody wants them,
* and send positive or negative acknowledgements as appropriate.
*/
 
static void aun_incoming(struct sk_buff *skb, struct aunhdr *ah, size_t len)
{
struct iphdr *ip = skb->nh.iph;
unsigned char stn = ntohl(ip->saddr) & 0xff;
struct sock *sk;
struct sk_buff *newskb;
struct ec_device *edev = skb->dev->ec_ptr;
 
if (! edev)
goto bad;
 
if ((sk = ec_listening_socket(ah->port, stn, edev->net)) == NULL)
goto bad; /* Nobody wants it */
 
newskb = alloc_skb((len - sizeof(struct aunhdr) + 15) & ~15,
GFP_ATOMIC);
if (newskb == NULL)
{
printk(KERN_DEBUG "AUN: memory squeeze, dropping packet.\n");
/* Send nack and hope sender tries again */
goto bad;
}
 
memcpy(skb_put(newskb, len - sizeof(struct aunhdr)), (void *)(ah+1),
len - sizeof(struct aunhdr));
 
if (ec_queue_packet(sk, newskb, stn, edev->net, ah->cb, ah->port))
{
/* Socket is bankrupt. */
kfree_skb(newskb);
goto bad;
}
 
aun_send_response(ip->saddr, ah->handle, 3, 0);
return;
 
bad:
aun_send_response(ip->saddr, ah->handle, 4, 0);
}
 
/*
* Handle incoming AUN transmit acknowledgements. If the sequence
* number matches something in our backlog then kill it and tell
* the user. If the remote took too long to reply then we may have
* dropped the packet already.
*/
 
static void aun_tx_ack(unsigned long seq, int result)
{
struct sk_buff *skb;
unsigned long flags;
struct ec_cb *eb;
 
spin_lock_irqsave(&aun_queue_lock, flags);
skb = skb_peek(&aun_queue);
while (skb && skb != (struct sk_buff *)&aun_queue)
{
struct sk_buff *newskb = skb->next;
eb = (struct ec_cb *)&skb->cb;
if (eb->seq == seq)
goto foundit;
 
skb = newskb;
}
spin_unlock_irqrestore(&aun_queue_lock, flags);
printk(KERN_DEBUG "AUN: unknown sequence %ld\n", seq);
return;
 
foundit:
tx_result(skb->sk, eb->cookie, result);
skb_unlink(skb);
spin_unlock_irqrestore(&aun_queue_lock, flags);
kfree_skb(skb);
}
 
/*
* Deal with received AUN frames - sort out what type of thing it is
* and hand it to the right function.
*/
 
static void aun_data_available(struct sock *sk, int slen)
{
int err;
struct sk_buff *skb;
unsigned char *data;
struct aunhdr *ah;
struct iphdr *ip;
size_t len;
 
while ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL) {
if (err == -EAGAIN) {
printk(KERN_ERR "AUN: no data available?!");
return;
}
printk(KERN_DEBUG "AUN: recvfrom() error %d\n", -err);
}
 
data = skb->h.raw + sizeof(struct udphdr);
ah = (struct aunhdr *)data;
len = skb->len - sizeof(struct udphdr);
ip = skb->nh.iph;
 
switch (ah->code)
{
case 2:
aun_incoming(skb, ah, len);
break;
case 3:
aun_tx_ack(ah->handle, ECTYPE_TRANSMIT_OK);
break;
case 4:
aun_tx_ack(ah->handle, ECTYPE_TRANSMIT_NOT_LISTENING);
break;
#if 0
/* This isn't quite right yet. */
case 5:
aun_send_response(ip->saddr, ah->handle, 6, ah->cb);
break;
#endif
default:
printk(KERN_DEBUG "unknown AUN packet (type %d)\n", data[0]);
}
 
skb_free_datagram(sk, skb);
}
 
/*
* Called by the timer to manage the AUN transmit queue. If a packet
* was sent to a dead or nonexistent host then we will never get an
* acknowledgement back. After a few seconds we need to spot this and
* drop the packet.
*/
 
static void ab_cleanup(unsigned long h)
{
struct sk_buff *skb;
unsigned long flags;
 
spin_lock_irqsave(&aun_queue_lock, flags);
skb = skb_peek(&aun_queue);
while (skb && skb != (struct sk_buff *)&aun_queue)
{
struct sk_buff *newskb = skb->next;
struct ec_cb *eb = (struct ec_cb *)&skb->cb;
if ((jiffies - eb->start) > eb->timeout)
{
tx_result(skb->sk, eb->cookie,
ECTYPE_TRANSMIT_NOT_PRESENT);
skb_unlink(skb);
kfree_skb(skb);
}
skb = newskb;
}
spin_unlock_irqrestore(&aun_queue_lock, flags);
 
mod_timer(&ab_cleanup_timer, jiffies + (HZ*2));
}
 
static int __init aun_udp_initialise(void)
{
int error;
struct sockaddr_in sin;
 
skb_queue_head_init(&aun_queue);
spin_lock_init(&aun_queue_lock);
init_timer(&ab_cleanup_timer);
ab_cleanup_timer.expires = jiffies + (HZ*2);
ab_cleanup_timer.function = ab_cleanup;
add_timer(&ab_cleanup_timer);
 
memset(&sin, 0, sizeof(sin));
sin.sin_port = htons(AUN_PORT);
 
/* We can count ourselves lucky Acorn machines are too dim to
speak IPv6. :-) */
if ((error = sock_create(PF_INET, SOCK_DGRAM, 0, &udpsock)) < 0)
{
printk("AUN: socket error %d\n", -error);
return error;
}
udpsock->sk->reuse = 1;
udpsock->sk->allocation = GFP_ATOMIC; /* we're going to call it
from interrupts */
error = udpsock->ops->bind(udpsock, (struct sockaddr *)&sin,
sizeof(sin));
if (error < 0)
{
printk("AUN: bind error %d\n", -error);
goto release;
}
 
udpsock->sk->data_ready = aun_data_available;
 
return 0;
 
release:
sock_release(udpsock);
udpsock = NULL;
return error;
}
#endif
 
#ifdef CONFIG_ECONET_NATIVE
 
/*
* Receive an Econet frame from a device.
*/
 
static int econet_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt)
{
struct ec_framehdr *hdr = (struct ec_framehdr *)skb->data;
struct sock *sk;
struct ec_device *edev = dev->ec_ptr;
 
if (! edev)
{
kfree_skb(skb);
return NET_RX_DROP;
}
 
if (skb->len < sizeof(struct ec_framehdr))
{
/* Frame is too small to be any use */
kfree_skb(skb);
return NET_RX_DROP;
}
 
/* First check for encapsulated IP */
if (hdr->port == EC_PORT_IP)
{
skb->protocol = htons(ETH_P_IP);
skb_pull(skb, sizeof(struct ec_framehdr));
netif_rx(skb);
return 0;
}
 
sk = ec_listening_socket(hdr->port, hdr->src_stn, hdr->src_net);
if (!sk)
{
kfree_skb(skb);
return NET_RX_DROP;
}
 
if (ec_queue_packet(sk, skb, edev->net, hdr->src_stn, hdr->cb,
hdr->port)) {
kfree_skb(skb);
return NET_RX_DROP;
}
return 0;
}
 
static struct packet_type econet_packet_type = {
type: __constant_htons(ETH_P_ECONET),
func: econet_rcv,
};
 
static void econet_hw_initialise(void)
{
dev_add_pack(&econet_packet_type);
}
 
#endif
 
static int econet_notifier(struct notifier_block *this, unsigned long msg, void *data)
{
struct net_device *dev = (struct net_device *)data;
struct ec_device *edev;
 
switch (msg) {
case NETDEV_UNREGISTER:
/* A device has gone down - kill any data we hold for it. */
edev = dev->ec_ptr;
if (edev)
{
if (net2dev_map[0] == dev)
net2dev_map[0] = 0;
net2dev_map[edev->net] = NULL;
kfree(edev);
dev->ec_ptr = NULL;
}
break;
}
 
return NOTIFY_DONE;
}
 
static struct notifier_block econet_netdev_notifier = {
notifier_call: econet_notifier,
};
 
static void __exit econet_proto_exit(void)
{
#ifdef CONFIG_ECONET_AUNUDP
del_timer(&ab_cleanup_timer);
if (udpsock)
sock_release(udpsock);
#endif
unregister_netdevice_notifier(&econet_netdev_notifier);
sock_unregister(econet_family_ops.family);
}
 
static int __init econet_proto_init(void)
{
sock_register(&econet_family_ops);
#ifdef CONFIG_ECONET_AUNUDP
spin_lock_init(&aun_queue_lock);
aun_udp_initialise();
#endif
#ifdef CONFIG_ECONET_NATIVE
econet_hw_initialise();
#endif
register_netdevice_notifier(&econet_netdev_notifier);
return 0;
}
 
module_init(econet_proto_init);
module_exit(econet_proto_exit);
 
MODULE_LICENSE("GPL");
/Makefile
0,0 → 1,16
#
# Makefile for Econet support code.
#
# 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...
 
O_TARGET := econet.o
 
obj-y := af_econet.o
obj-m := $(O_TARGET)
 
include $(TOPDIR)/Rules.make
 

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