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linux/net/wanrouter/af_wanpipe.c
Jesper Juhl a51482bde2 [NET]: kfree cleanup 
From: Jesper Juhl <jesper.juhl@gmail.com>

This is the net/ part of the big kfree cleanup patch.

Remove pointless checks for NULL prior to calling kfree() in net/.

Signed-off-by: Jesper Juhl <jesper.juhl@gmail.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Arnaldo Carvalho de Melo <acme@conectiva.com.br>
Acked-by: Marcel Holtmann <marcel@holtmann.org>
Acked-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
2005-11-08 09:41:34 -08:00

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/*****************************************************************************
* af_wanpipe.c WANPIPE(tm) Secure Socket Layer.
*
* Author: Nenad Corbic <ncorbic@sangoma.com>
*
* Copyright: (c) 2000 Sangoma Technologies Inc.
*
* 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.
* ============================================================================
* Due Credit:
* Wanpipe socket layer is based on Packet and
* the X25 socket layers. The above sockets were
* used for the specific use of Sangoma Technoloiges
* API programs.
* Packet socket Authors: Ross Biro, Fred N. van Kempen and
* Alan Cox.
* X25 socket Author: Jonathan Naylor.
* ============================================================================
* Mar 15, 2002 Arnaldo C. Melo o Use wp_sk()->num, as it isnt anymore in sock
* Apr 25, 2000 Nenad Corbic o Added the ability to send zero length packets.
* Mar 13, 2000 Nenad Corbic o Added a tx buffer check via ioctl call.
* Mar 06, 2000 Nenad Corbic o Fixed the corrupt sock lcn problem.
* Server and client applicaton can run
* simultaneously without conflicts.
* Feb 29, 2000 Nenad Corbic o Added support for PVC protocols, such as
* CHDLC, Frame Relay and HDLC API.
* Jan 17, 2000 Nenad Corbic o Initial version, based on AF_PACKET socket.
* X25API support only.
*
******************************************************************************/
#include <linux/config.h>
#include <linux/types.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/fcntl.h>
#include <linux/socket.h>
#include <linux/in.h>
#include <linux/inet.h>
#include <linux/netdevice.h>
#include <linux/poll.h>
#include <linux/wireless.h>
#include <linux/kmod.h>
#include <net/ip.h>
#include <net/protocol.h>
#include <linux/skbuff.h>
#include <net/sock.h>
#include <linux/errno.h>
#include <linux/timer.h>
#include <asm/system.h>
#include <asm/uaccess.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/wanpipe.h>
#include <linux/if_wanpipe.h>
#include <linux/pkt_sched.h>
#include <linux/tcp_states.h>
#include <linux/if_wanpipe_common.h>
#include <linux/sdla_x25.h>
#ifdef CONFIG_INET
#include <net/inet_common.h>
#endif
#define SLOW_BACKOFF 0.1*HZ
#define FAST_BACKOFF 0.01*HZ
//#define PRINT_DEBUG
#ifdef PRINT_DEBUG
#define DBG_PRINTK(format, a...) printk(format, ## a)
#else
#define DBG_PRINTK(format, a...)
#endif
/* SECURE SOCKET IMPLEMENTATION
*
* TRANSMIT:
*
* When the user sends a packet via send() system call
* the wanpipe_sendmsg() function is executed.
*
* Each packet is enqueud into sk->sk_write_queue transmit
* queue. When the packet is enqueued, a delayed transmit
* timer is triggerd which acts as a Bottom Half hander.
*
* wanpipe_delay_transmit() function (BH), dequeues packets
* from the sk->sk_write_queue transmit queue and sends it
* to the deriver via dev->hard_start_xmit(skb, dev) function.
* Note, this function is actual a function pointer of if_send()
* routine in the wanpipe driver.
*
* X25API GUARANTEED DELIVERY:
*
* In order to provide 100% guaranteed packet delivery,
* an atomic 'packet_sent' counter is implemented. Counter
* is incremented for each packet enqueued
* into sk->sk_write_queue. Counter is decremented each
* time wanpipe_delayed_transmit() function successfuly
* passes the packet to the driver. Before each send(), a poll
* routine checks the sock resources The maximum value of
* packet sent counter is 1, thus if one packet is queued, the
* application will block until that packet is passed to the
* driver.
*
* RECEIVE:
*
* Wanpipe device drivers call the socket bottom half
* function, wanpipe_rcv() to queue the incoming packets
* into an AF_WANPIPE socket queue. Based on wanpipe_rcv()
* return code, the driver knows whether the packet was
* successfully queued. If the socket queue is full,
* protocol flow control is used by the driver, if any,
* to slow down the traffic until the sock queue is free.
*
* Every time a packet arrives into a socket queue the
* socket wakes up processes which are waiting to receive
* data.
*
* If the socket queue is full, the driver sets a block
* bit which signals the socket to kick the wanpipe driver
* bottom half hander when the socket queue is partialy
* empty. wanpipe_recvmsg() function performs this action.
*
* In case of x25api, packets will never be dropped, since
* flow control is available.
*
* In case of streaming protocols like CHDLC, packets will
* be dropped but the statistics will be generated.
*/
/* The code below is used to test memory leaks. It prints out
* a message every time kmalloc and kfree system calls get executed.
* If the calls match there is no leak :)
*/
/***********FOR DEBUGGING PURPOSES*********************************************
#define KMEM_SAFETYZONE 8
static void * dbg_kmalloc(unsigned int size, int prio, int line) {
void * v = kmalloc(size,prio);
printk(KERN_INFO "line %d kmalloc(%d,%d) = %p\n",line,size,prio,v);
return v;
}
static void dbg_kfree(void * v, int line) {
printk(KERN_INFO "line %d kfree(%p)\n",line,v);
kfree(v);
}
#define kmalloc(x,y) dbg_kmalloc(x,y,__LINE__)
#define kfree(x) dbg_kfree(x,__LINE__)
******************************************************************************/
/* List of all wanpipe sockets. */
HLIST_HEAD(wanpipe_sklist);
static DEFINE_RWLOCK(wanpipe_sklist_lock);
atomic_t wanpipe_socks_nr;
static unsigned long wanpipe_tx_critical;
#if 0
/* Private wanpipe socket structures. */
struct wanpipe_opt
{
void *mbox; /* Mail box */
void *card; /* Card bouded to */
struct net_device *dev; /* Bounded device */
unsigned short lcn; /* Binded LCN */
unsigned char svc; /* 0=pvc, 1=svc */
unsigned char timer; /* flag for delayed transmit*/
struct timer_list tx_timer;
unsigned poll_cnt;
unsigned char force; /* Used to force sock release */
atomic_t packet_sent;
};
#endif
static int sk_count;
extern struct proto_ops wanpipe_ops;
static unsigned long find_free_critical;
static void wanpipe_unlink_driver(struct sock *sk);
static void wanpipe_link_driver(struct net_device *dev, struct sock *sk);
static void wanpipe_wakeup_driver(struct sock *sk);
static int execute_command(struct sock *, unsigned char, unsigned int);
static int check_dev(struct net_device *dev, sdla_t *card);
struct net_device *wanpipe_find_free_dev(sdla_t *card);
static void wanpipe_unlink_card (struct sock *);
static int wanpipe_link_card (struct sock *);
static struct sock *wanpipe_make_new(struct sock *);
static struct sock *wanpipe_alloc_socket(void);
static inline int get_atomic_device(struct net_device *dev);
static int wanpipe_exec_cmd(struct sock *, int, unsigned int);
static int get_ioctl_cmd (struct sock *, void *);
static int set_ioctl_cmd (struct sock *, void *);
static void release_device(struct net_device *dev);
static void wanpipe_kill_sock_timer (unsigned long data);
static void wanpipe_kill_sock_irq (struct sock *);
static void wanpipe_kill_sock_accept (struct sock *);
static int wanpipe_do_bind(struct sock *sk, struct net_device *dev,
int protocol);
struct sock * get_newsk_from_skb (struct sk_buff *);
static int wanpipe_debug (struct sock *, void *);
static void wanpipe_delayed_transmit (unsigned long data);
static void release_driver(struct sock *);
static void start_cleanup_timer (struct sock *);
static void check_write_queue(struct sock *);
static int check_driver_busy (struct sock *);
/*============================================================
* wanpipe_rcv
*
* Wanpipe socket bottom half handler. This function
* is called by the WANPIPE device drivers to queue a
* incoming packet into the socket receive queue.
* Once the packet is queued, all processes waiting to
* read are woken up.
*
* During socket bind, this function is bounded into
* WANPIPE driver private.
*===========================================================*/
static int wanpipe_rcv(struct sk_buff *skb, struct net_device *dev,
struct sock *sk)
{
struct wan_sockaddr_ll *sll = (struct wan_sockaddr_ll*)skb->cb;
wanpipe_common_t *chan = dev->priv;
/*
* When we registered the protocol we saved the socket in the data
* field for just this event.
*/
skb->dev = dev;
sll->sll_family = AF_WANPIPE;
sll->sll_hatype = dev->type;
sll->sll_protocol = skb->protocol;
sll->sll_pkttype = skb->pkt_type;
sll->sll_ifindex = dev->ifindex;
sll->sll_halen = 0;
if (dev->hard_header_parse)
sll->sll_halen = dev->hard_header_parse(skb, sll->sll_addr);
/*
* WAN_PACKET_DATA : Data which should be passed up the receive queue.
* WAN_PACKET_ASYC : Asynchronous data like place call, which should
* be passed up the listening sock.
* WAN_PACKET_ERR : Asynchronous data like clear call or restart
* which should go into an error queue.
*/
switch (skb->pkt_type){
case WAN_PACKET_DATA:
if (sock_queue_rcv_skb(sk,skb)<0){
return -ENOMEM;
}
break;
case WAN_PACKET_CMD:
sk->sk_state = chan->state;
/* Bug fix: update Mar6.
* Do not set the sock lcn number here, since
* cmd is not guaranteed to be executed on the
* board, thus Lcn could be wrong */
sk->sk_data_ready(sk, skb->len);
kfree_skb(skb);
break;
case WAN_PACKET_ERR:
sk->sk_state = chan->state;
if (sock_queue_err_skb(sk,skb)<0){
return -ENOMEM;
}
break;
default:
printk(KERN_INFO "wansock: BH Illegal Packet Type Dropping\n");
kfree_skb(skb);
break;
}
//??????????????????????
// if (sk->sk_state == WANSOCK_DISCONNECTED){
// if (sk->sk_zapped) {
// //printk(KERN_INFO "wansock: Disconnected, killing early\n");
// wanpipe_unlink_driver(sk);
// sk->sk_bound_dev_if = 0;
// }
// }
return 0;
}
/*============================================================
* wanpipe_listen_rcv
*
* Wanpipe LISTEN socket bottom half handler. This function
* is called by the WANPIPE device drivers to queue an
* incoming call into the socket listening queue.
* Once the packet is queued, the waiting accept() process
* is woken up.
*
* During socket bind, this function is bounded into
* WANPIPE driver private.
*
* IMPORTANT NOTE:
* The accept call() is waiting for an skb packet
* which contains a pointer to a device structure.
*
* When we do a bind to a device structre, we
* bind a newly created socket into "chan->sk". Thus,
* when accept receives the skb packet, it will know
* from which dev it came form, and in turn it will know
* the address of the new sock.
*
* NOTE: This function gets called from driver ISR.
*===========================================================*/
static int wanpipe_listen_rcv (struct sk_buff *skb, struct sock *sk)
{
wanpipe_opt *wp = wp_sk(sk), *newwp;
struct wan_sockaddr_ll *sll = (struct wan_sockaddr_ll*)skb->cb;
struct sock *newsk;
struct net_device *dev;
sdla_t *card;
mbox_cmd_t *mbox_ptr;
wanpipe_common_t *chan;
/* Find a free device, if none found, all svc's are busy
*/
card = (sdla_t*)wp->card;
if (!card){
printk(KERN_INFO "wansock: LISTEN ERROR, No Card\n");
return -ENODEV;
}
dev = wanpipe_find_free_dev(card);
if (!dev){
printk(KERN_INFO "wansock: LISTEN ERROR, No Free Device\n");
return -ENODEV;
}
chan=dev->priv;
chan->state = WANSOCK_CONNECTING;
/* Allocate a new sock, which accept will bind
* and pass up to the user
*/
if ((newsk = wanpipe_make_new(sk)) == NULL){
release_device(dev);
return -ENOMEM;
}
/* Initialize the new sock structure
*/
newsk->sk_bound_dev_if = dev->ifindex;
newwp = wp_sk(newsk);
newwp->card = wp->card;
/* Insert the sock into the main wanpipe
* sock list.
*/
atomic_inc(&wanpipe_socks_nr);
/* Allocate and fill in the new Mail Box. Then
* bind the mail box to the sock. It will be
* used by the ioctl call to read call information
* and to execute commands.
*/
if ((mbox_ptr = kmalloc(sizeof(mbox_cmd_t), GFP_ATOMIC)) == NULL) {
wanpipe_kill_sock_irq (newsk);
release_device(dev);
return -ENOMEM;
}
memset(mbox_ptr, 0, sizeof(mbox_cmd_t));
memcpy(mbox_ptr,skb->data,skb->len);
/* Register the lcn on which incoming call came
* from. Thus, if we have to clear it, we know
* which lcn to clear
*/
newwp->lcn = mbox_ptr->cmd.lcn;
newwp->mbox = (void *)mbox_ptr;
DBG_PRINTK(KERN_INFO "NEWSOCK : Device %s, bind to lcn %i\n",
dev->name,mbox_ptr->cmd.lcn);
chan->lcn = mbox_ptr->cmd.lcn;
card->u.x.svc_to_dev_map[(chan->lcn%MAX_X25_LCN)] = dev;
sock_reset_flag(newsk, SOCK_ZAPPED);
newwp->num = htons(X25_PROT);
if (wanpipe_do_bind(newsk, dev, newwp->num)) {
wanpipe_kill_sock_irq (newsk);
release_device(dev);
return -EINVAL;
}
newsk->sk_state = WANSOCK_CONNECTING;
/* Fill in the standard sock address info */
sll->sll_family = AF_WANPIPE;
sll->sll_hatype = dev->type;
sll->sll_protocol = skb->protocol;
sll->sll_pkttype = skb->pkt_type;
sll->sll_ifindex = dev->ifindex;
sll->sll_halen = 0;
skb->dev = dev;
sk->sk_ack_backlog++;
/* We must do this manually, since the sock_queue_rcv_skb()
* function sets the skb->dev to NULL. However, we use
* the dev field in the accept function.*/
if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >=
(unsigned)sk->sk_rcvbuf) {
wanpipe_unlink_driver(newsk);
wanpipe_kill_sock_irq (newsk);
--sk->sk_ack_backlog;
return -ENOMEM;
}
skb_set_owner_r(skb, sk);
skb_queue_tail(&sk->sk_receive_queue, skb);
sk->sk_data_ready(sk, skb->len);
return 0;
}
/*============================================================
* wanpipe_make_new
*
* Create a new sock, and allocate a wanpipe private
* structure to it. Also, copy the important data
* from the original sock to the new sock.
*
* This function is used by wanpipe_listen_rcv() listen
* bottom half handler. A copy of the listening sock
* is created using this function.
*
*===========================================================*/
static struct sock *wanpipe_make_new(struct sock *osk)
{
struct sock *sk;
if (osk->sk_type != SOCK_RAW)
return NULL;
if ((sk = wanpipe_alloc_socket()) == NULL)
return NULL;
sk->sk_type = osk->sk_type;
sk->sk_socket = osk->sk_socket;
sk->sk_priority = osk->sk_priority;
sk->sk_protocol = osk->sk_protocol;
wp_sk(sk)->num = wp_sk(osk)->num;
sk->sk_rcvbuf = osk->sk_rcvbuf;
sk->sk_sndbuf = osk->sk_sndbuf;
sk->sk_state = WANSOCK_CONNECTING;
sk->sk_sleep = osk->sk_sleep;
if (sock_flag(osk, SOCK_DBG))
sock_set_flag(sk, SOCK_DBG);
return sk;
}
/*
* FIXME: wanpipe_opt has to include a sock in its definition and stop using
* sk_protinfo, but this code is not even compilable now, so lets leave it for
* later.
*/
static struct proto wanpipe_proto = {
.name = "WANPIPE",
.owner = THIS_MODULE,
.obj_size = sizeof(struct sock),
};
/*============================================================
* wanpipe_make_new
*
* Allocate memory for the a new sock, and sock
* private data.
*
* Increment the module use count.
*
* This function is used by wanpipe_create() and
* wanpipe_make_new() functions.
*
*===========================================================*/
static struct sock *wanpipe_alloc_socket(void)
{
struct sock *sk;
struct wanpipe_opt *wan_opt;
if ((sk = sk_alloc(PF_WANPIPE, GFP_ATOMIC, &wanpipe_proto, 1)) == NULL)
return NULL;
if ((wan_opt = kmalloc(sizeof(struct wanpipe_opt), GFP_ATOMIC)) == NULL) {
sk_free(sk);
return NULL;
}
memset(wan_opt, 0x00, sizeof(struct wanpipe_opt));
wp_sk(sk) = wan_opt;
/* Use timer to send data to the driver. This will act
* as a BH handler for sendmsg functions */
init_timer(&wan_opt->tx_timer);
wan_opt->tx_timer.data = (unsigned long)sk;
wan_opt->tx_timer.function = wanpipe_delayed_transmit;
sock_init_data(NULL, sk);
return sk;
}
/*============================================================
* wanpipe_sendmsg
*
* This function implements a sendto() system call,
* for AF_WANPIPE socket family.
* During socket bind() sk->sk_bound_dev_if is initialized
* to a correct network device. This number is used
* to find a network device to which the packet should
* be passed to.
*
* Each packet is queued into sk->sk_write_queue and
* delayed transmit bottom half handler is marked for
* execution.
*
* A socket must be in WANSOCK_CONNECTED state before
* a packet is queued into sk->sk_write_queue.
*===========================================================*/
static int wanpipe_sendmsg(struct kiocb *iocb, struct socket *sock,
struct msghdr *msg, int len)
{
wanpipe_opt *wp;
struct sock *sk = sock->sk;
struct wan_sockaddr_ll *saddr=(struct wan_sockaddr_ll *)msg->msg_name;
struct sk_buff *skb;
struct net_device *dev;
unsigned short proto;
unsigned char *addr;
int ifindex, err, reserve = 0;
if (!sock_flag(sk, SOCK_ZAPPED))
return -ENETDOWN;
if (sk->sk_state != WANSOCK_CONNECTED)
return -ENOTCONN;
if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_CMSG_COMPAT))
return(-EINVAL);
/* it was <=, now one can send
* zero length packets */
if (len < sizeof(x25api_hdr_t))
return -EINVAL;
wp = wp_sk(sk);
if (saddr == NULL) {
ifindex = sk->sk_bound_dev_if;
proto = wp->num;
addr = NULL;
}else{
if (msg->msg_namelen < sizeof(struct wan_sockaddr_ll)){
return -EINVAL;
}
ifindex = sk->sk_bound_dev_if;
proto = saddr->sll_protocol;
addr = saddr->sll_addr;
}
dev = dev_get_by_index(ifindex);
if (dev == NULL){
printk(KERN_INFO "wansock: Send failed, dev index: %i\n",ifindex);
return -ENXIO;
}
dev_put(dev);
if (sock->type == SOCK_RAW)
reserve = dev->hard_header_len;
if (len > dev->mtu+reserve){
return -EMSGSIZE;
}
skb = sock_alloc_send_skb(sk, len + LL_RESERVED_SPACE(dev),
msg->msg_flags & MSG_DONTWAIT, &err);
if (skb==NULL){
goto out_unlock;
}
skb_reserve(skb, LL_RESERVED_SPACE(dev));
skb->nh.raw = skb->data;
/* Returns -EFAULT on error */
err = memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len);
if (err){
goto out_free;
}
if (dev->hard_header) {
int res;
err = -EINVAL;
res = dev->hard_header(skb, dev, ntohs(proto), addr, NULL, len);
if (res<0){
goto out_free;
}
}
skb->protocol = proto;
skb->dev = dev;
skb->priority = sk->sk_priority;
skb->pkt_type = WAN_PACKET_DATA;
err = -ENETDOWN;
if (!(dev->flags & IFF_UP))
goto out_free;
if (atomic_read(&sk->sk_wmem_alloc) + skb->truesize >
(unsigned int)sk->sk_sndbuf){
kfree_skb(skb);
return -ENOBUFS;
}
skb_queue_tail(&sk->sk_write_queue,skb);
atomic_inc(&wp->packet_sent);
if (!(test_and_set_bit(0, &wp->timer)))
mod_timer(&wp->tx_timer, jiffies + 1);
return(len);
out_free:
kfree_skb(skb);
out_unlock:
return err;
}
/*============================================================
* wanpipe_delayed_tarnsmit
*
* Transmit bottom half handler. It dequeues packets
* from sk->sk_write_queue and passes them to the
* driver. If the driver is busy, the packet is
* re-enqueued.
*
* Packet Sent counter is decremented on successful
* transmission.
*===========================================================*/
static void wanpipe_delayed_transmit (unsigned long data)
{
struct sock *sk=(struct sock *)data;
struct sk_buff *skb;
wanpipe_opt *wp = wp_sk(sk);
struct net_device *dev = wp->dev;
sdla_t *card = (sdla_t*)wp->card;
if (!card || !dev){
clear_bit(0, &wp->timer);
DBG_PRINTK(KERN_INFO "wansock: Transmit delay, no dev or card\n");
return;
}
if (sk->sk_state != WANSOCK_CONNECTED || !sock_flag(sk, SOCK_ZAPPED)) {
clear_bit(0, &wp->timer);
DBG_PRINTK(KERN_INFO "wansock: Tx Timer, State not CONNECTED\n");
return;
}
/* If driver is executing command, we must offload
* the board by not sending data. Otherwise a
* pending command will never get a free buffer
* to execute */
if (atomic_read(&card->u.x.command_busy)){
wp->tx_timer.expires = jiffies + SLOW_BACKOFF;
add_timer(&wp->tx_timer);
DBG_PRINTK(KERN_INFO "wansock: Tx Timer, command bys BACKOFF\n");
return;
}
if (test_and_set_bit(0,&wanpipe_tx_critical)){
printk(KERN_INFO "WanSock: Tx timer critical %s\n",dev->name);
wp->tx_timer.expires = jiffies + SLOW_BACKOFF;
add_timer(&wp->tx_timer);
return;
}
/* Check for a packet in the fifo and send */
if ((skb = skb_dequeue(&sk->sk_write_queue)) != NULL){
if (dev->hard_start_xmit(skb, dev) != 0){
/* Driver failed to transmit, re-enqueue
* the packet and retry again later */
skb_queue_head(&sk->sk_write_queue,skb);
clear_bit(0,&wanpipe_tx_critical);
return;
}else{
/* Packet Sent successful. Check for more packets
* if more packets, re-trigger the transmit routine
* other wise exit
*/
atomic_dec(&wp->packet_sent);
if (skb_peek(&sk->sk_write_queue) == NULL) {
/* If there is nothing to send, kick
* the poll routine, which will trigger
* the application to send more data */
sk->sk_data_ready(sk, 0);
clear_bit(0, &wp->timer);
}else{
/* Reschedule as fast as possible */
wp->tx_timer.expires = jiffies + 1;
add_timer(&wp->tx_timer);
}
}
}
clear_bit(0,&wanpipe_tx_critical);
}
/*============================================================
* execute_command
*
* Execute x25api commands. The atomic variable
* chan->command is used to indicate to the driver that
* command is pending for execution. The acutal command
* structure is placed into a sock mbox structure
* (wp_sk(sk)->mbox).
*
* The sock private structure, mbox is
* used as shared memory between sock and the driver.
* Driver uses the sock mbox to execute the command
* and return the result.
*
* For all command except PLACE CALL, the function
* waits for the result. PLACE CALL can be ether
* blocking or nonblocking. The user sets this option
* via ioctl call.
*===========================================================*/
static int execute_command(struct sock *sk, unsigned char cmd, unsigned int flags)
{
wanpipe_opt *wp = wp_sk(sk);
struct net_device *dev;
wanpipe_common_t *chan=NULL;
int err=0;
DECLARE_WAITQUEUE(wait, current);
dev = dev_get_by_index(sk->sk_bound_dev_if);
if (dev == NULL){
printk(KERN_INFO "wansock: Exec failed no dev %i\n",
sk->sk_bound_dev_if);
return -ENODEV;
}
dev_put(dev);
if ((chan=dev->priv) == NULL){
printk(KERN_INFO "wansock: Exec cmd failed no priv area\n");
return -ENODEV;
}
if (atomic_read(&chan->command)){
printk(KERN_INFO "wansock: ERROR: Command already running %x, %s\n",
atomic_read(&chan->command),dev->name);
return -EINVAL;
}
if (!wp->mbox) {
printk(KERN_INFO "wansock: In execute without MBOX\n");
return -EINVAL;
}
((mbox_cmd_t*)wp->mbox)->cmd.command = cmd;
((mbox_cmd_t*)wp->mbox)->cmd.lcn = wp->lcn;
((mbox_cmd_t*)wp->mbox)->cmd.result = 0x7F;
if (flags & O_NONBLOCK){
cmd |= 0x80;
atomic_set(&chan->command, cmd);
}else{
atomic_set(&chan->command, cmd);
}
add_wait_queue(sk->sk_sleep,&wait);
current->state = TASK_INTERRUPTIBLE;
for (;;){
if (((mbox_cmd_t*)wp->mbox)->cmd.result != 0x7F) {
err = 0;
break;
}
if (signal_pending(current)) {
err = -ERESTARTSYS;
break;
}
schedule();
}
current->state = TASK_RUNNING;
remove_wait_queue(sk->sk_sleep,&wait);
return err;
}
/*============================================================
* wanpipe_destroy_timer
*
* Used by wanpipe_release, to delay release of
* the socket.
*===========================================================*/
static void wanpipe_destroy_timer(unsigned long data)
{
struct sock *sk=(struct sock *)data;
wanpipe_opt *wp = wp_sk(sk);
if ((!atomic_read(&sk->sk_wmem_alloc) &&
!atomic_read(&sk->sk_rmem_alloc)) ||
(++wp->force == 5)) {
if (atomic_read(&sk->sk_wmem_alloc) ||
atomic_read(&sk->sk_rmem_alloc))
printk(KERN_INFO "wansock: Warning, Packet Discarded due to sock shutdown!\n");
kfree(wp);
wp_sk(sk) = NULL;
if (atomic_read(&sk->sk_refcnt) != 1) {
atomic_set(&sk->sk_refcnt, 1);
DBG_PRINTK(KERN_INFO "wansock: Error, wrong reference count: %i ! :delay.\n",
atomic_read(&sk->sk_refcnt));
}
sock_put(sk);
atomic_dec(&wanpipe_socks_nr);
return;
}
sk->sk_timer.expires = jiffies + 5 * HZ;
add_timer(&sk->sk_timer);
printk(KERN_INFO "wansock: packet sk destroy delayed\n");
}
/*============================================================
* wanpipe_unlink_driver
*
* When the socket is released, this function is
* used to remove links that bind the sock and the
* driver together.
*===========================================================*/
static void wanpipe_unlink_driver (struct sock *sk)
{
struct net_device *dev;
wanpipe_common_t *chan=NULL;
sock_reset_flag(sk, SOCK_ZAPPED);
sk->sk_state = WANSOCK_DISCONNECTED;
wp_sk(sk)->dev = NULL;
dev = dev_get_by_index(sk->sk_bound_dev_if);
if (!dev){
printk(KERN_INFO "wansock: No dev on release\n");
return;
}
dev_put(dev);
if ((chan = dev->priv) == NULL){
printk(KERN_INFO "wansock: No Priv Area on release\n");
return;
}
set_bit(0,&chan->common_critical);
chan->sk=NULL;
chan->func=NULL;
chan->mbox=NULL;
chan->tx_timer=NULL;
clear_bit(0,&chan->common_critical);
release_device(dev);
return;
}
/*============================================================
* wanpipe_link_driver
*
* Upon successful bind(), sock is linked to a driver
* by binding in the wanpipe_rcv() bottom half handler
* to the driver function pointer, as well as sock and
* sock mailbox addresses. This way driver can pass
* data up the socket.
*===========================================================*/
static void wanpipe_link_driver(struct net_device *dev, struct sock *sk)
{
wanpipe_opt *wp = wp_sk(sk);
wanpipe_common_t *chan = dev->priv;
if (!chan)
return;
set_bit(0,&chan->common_critical);
chan->sk=sk;
chan->func=wanpipe_rcv;
chan->mbox = wp->mbox;
chan->tx_timer = &wp->tx_timer;
wp->dev = dev;
sock_set_flag(sk, SOCK_ZAPPED);
clear_bit(0,&chan->common_critical);
}
/*============================================================
* release_device
*
* During sock release, clear a critical bit, which
* marks the device a being taken.
*===========================================================*/
static void release_device(struct net_device *dev)
{
wanpipe_common_t *chan=dev->priv;
clear_bit(0,(void*)&chan->rw_bind);
}
/*============================================================
* wanpipe_release
*
* Close a PACKET socket. This is fairly simple. We
* immediately go to 'closed' state and remove our
* protocol entry in the device list.
*===========================================================*/
static int wanpipe_release(struct socket *sock)
{
wanpipe_opt *wp;
struct sock *sk = sock->sk;
if (!sk)
return 0;
wp = wp_sk(sk);
check_write_queue(sk);
/* Kill the tx timer, if we don't kill it now, the timer
* will run after we kill the sock. Timer code will
* try to access the sock which has been killed and cause
* kernel panic */
del_timer(&wp->tx_timer);
/*
* Unhook packet receive handler.
*/
if (wp->num == htons(X25_PROT) &&
sk->sk_state != WANSOCK_DISCONNECTED && sock_flag(sk, SOCK_ZAPPED)) {
struct net_device *dev = dev_get_by_index(sk->sk_bound_dev_if);
wanpipe_common_t *chan;
if (dev){
chan=dev->priv;
atomic_set(&chan->disconnect,1);
DBG_PRINTK(KERN_INFO "wansock: Sending Clear Indication %i\n",
sk->sk_state);
dev_put(dev);
}
}
set_bit(1,&wanpipe_tx_critical);
write_lock(&wanpipe_sklist_lock);
sk_del_node_init(sk);
write_unlock(&wanpipe_sklist_lock);
clear_bit(1,&wanpipe_tx_critical);
release_driver(sk);
/*
* Now the socket is dead. No more input will appear.
*/
sk->sk_state_change(sk); /* It is useless. Just for sanity. */
sock->sk = NULL;
sk->sk_socket = NULL;
sock_set_flag(sk, SOCK_DEAD);
/* Purge queues */
skb_queue_purge(&sk->sk_receive_queue);
skb_queue_purge(&sk->sk_write_queue);
skb_queue_purge(&sk->sk_error_queue);
if (atomic_read(&sk->sk_rmem_alloc) ||
atomic_read(&sk->sk_wmem_alloc)) {
del_timer(&sk->sk_timer);
printk(KERN_INFO "wansock: Killing in Timer R %i , W %i\n",
atomic_read(&sk->sk_rmem_alloc),
atomic_read(&sk->sk_wmem_alloc));
sk->sk_timer.data = (unsigned long)sk;
sk->sk_timer.expires = jiffies + HZ;
sk->sk_timer.function = wanpipe_destroy_timer;
add_timer(&sk->sk_timer);
return 0;
}
kfree(wp);
wp_sk(sk) = NULL;
if (atomic_read(&sk->sk_refcnt) != 1) {
DBG_PRINTK(KERN_INFO "wansock: Error, wrong reference count: %i !:release.\n",
atomic_read(&sk->sk_refcnt));
atomic_set(&sk->sk_refcnt, 1);
}
sock_put(sk);
atomic_dec(&wanpipe_socks_nr);
return 0;
}
/*============================================================
* check_write_queue
*
* During sock shutdown, if the sock state is
* WANSOCK_CONNECTED and there is transmit data
* pending. Wait until data is released
* before proceeding.
*===========================================================*/
static void check_write_queue(struct sock *sk)
{
if (sk->sk_state != WANSOCK_CONNECTED)
return;
if (!atomic_read(&sk->sk_wmem_alloc))
return;
printk(KERN_INFO "wansock: MAJOR ERROR, Data lost on sock release !!!\n");
}
/*============================================================
* release_driver
*
* This function is called during sock shutdown, to
* release any resources and links that bind the sock
* to the driver. It also changes the state of the
* sock to WANSOCK_DISCONNECTED
*===========================================================*/
static void release_driver(struct sock *sk)
{
wanpipe_opt *wp;
struct sk_buff *skb=NULL;
struct sock *deadsk=NULL;
if (sk->sk_state == WANSOCK_LISTEN ||
sk->sk_state == WANSOCK_BIND_LISTEN) {
while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
if ((deadsk = get_newsk_from_skb(skb))){
DBG_PRINTK (KERN_INFO "wansock: RELEASE: FOUND DEAD SOCK\n");
sock_set_flag(deadsk, SOCK_DEAD);
start_cleanup_timer(deadsk);
}
kfree_skb(skb);
}
if (sock_flag(sk, SOCK_ZAPPED))
wanpipe_unlink_card(sk);
}else{
if (sock_flag(sk, SOCK_ZAPPED))
wanpipe_unlink_driver(sk);
}
sk->sk_state = WANSOCK_DISCONNECTED;
sk->sk_bound_dev_if = 0;
sock_reset_flag(sk, SOCK_ZAPPED);
wp = wp_sk(sk);
if (wp) {
kfree(wp->mbox);
wp->mbox = NULL;
}
}
/*============================================================
* start_cleanup_timer
*
* If new incoming call's are pending but the socket
* is being released, start the timer which will
* envoke the kill routines for pending socks.
*===========================================================*/
static void start_cleanup_timer (struct sock *sk)
{
del_timer(&sk->sk_timer);
sk->sk_timer.data = (unsigned long)sk;
sk->sk_timer.expires = jiffies + HZ;
sk->sk_timer.function = wanpipe_kill_sock_timer;
add_timer(&sk->sk_timer);
}
/*============================================================
* wanpipe_kill_sock
*
* This is a function which performs actual killing
* of the sock. It releases socket resources,
* and unlinks the sock from the driver.
*===========================================================*/
static void wanpipe_kill_sock_timer (unsigned long data)
{
struct sock *sk = (struct sock *)data;
struct sock **skp;
if (!sk)
return;
/* This function can be called from interrupt. We must use
* appropriate locks */
if (test_bit(1,&wanpipe_tx_critical)){
sk->sk_timer.expires = jiffies + 10;
add_timer(&sk->sk_timer);
return;
}
write_lock(&wanpipe_sklist_lock);
sk_del_node_init(sk);
write_unlock(&wanpipe_sklist_lock);
if (wp_sk(sk)->num == htons(X25_PROT) &&
sk->sk_state != WANSOCK_DISCONNECTED) {
struct net_device *dev = dev_get_by_index(sk->sk_bound_dev_if);
wanpipe_common_t *chan;
if (dev){
chan=dev->priv;
atomic_set(&chan->disconnect,1);
dev_put(dev);
}
}
release_driver(sk);
sk->sk_socket = NULL;
/* Purge queues */
skb_queue_purge(&sk->sk_receive_queue);
skb_queue_purge(&sk->sk_write_queue);
skb_queue_purge(&sk->sk_error_queue);
if (atomic_read(&sk->sk_rmem_alloc) ||
atomic_read(&sk->sk_wmem_alloc)) {
del_timer(&sk->sk_timer);
printk(KERN_INFO "wansock: Killing SOCK in Timer\n");
sk->sk_timer.data = (unsigned long)sk;
sk->sk_timer.expires = jiffies + HZ;
sk->sk_timer.function = wanpipe_destroy_timer;
add_timer(&sk->sk_timer);
return;
}
kfree(wp_sk(sk));
wp_sk(sk) = NULL;
if (atomic_read(&sk->sk_refcnt) != 1) {
atomic_set(&sk->sk_refcnt, 1);
DBG_PRINTK(KERN_INFO "wansock: Error, wrong reference count: %i ! :timer.\n",
atomic_read(&sk->sk_refcnt));
}
sock_put(sk);
atomic_dec(&wanpipe_socks_nr);
return;
}
static void wanpipe_kill_sock_accept (struct sock *sk)
{
struct sock **skp;
if (!sk)
return;
/* This function can be called from interrupt. We must use
* appropriate locks */
write_lock(&wanpipe_sklist_lock);
sk_del_node_init(sk);
write_unlock(&wanpipe_sklist_lock);
sk->sk_socket = NULL;
kfree(wp_sk(sk));
wp_sk(sk) = NULL;
if (atomic_read(&sk->sk_refcnt) != 1) {
atomic_set(&sk->sk_refcnt, 1);
DBG_PRINTK(KERN_INFO "wansock: Error, wrong reference count: %i ! :timer.\n",
atomic_read(&sk->sk_refcnt));
}
sock_put(sk);
atomic_dec(&wanpipe_socks_nr);
return;
}
static void wanpipe_kill_sock_irq (struct sock *sk)
{
if (!sk)
return;
sk->sk_socket = NULL;
kfree(wp_sk(sk));
wp_sk(sk) = NULL;
if (atomic_read(&sk->sk_refcnt) != 1) {
atomic_set(&sk->sk_refcnt, 1);
DBG_PRINTK(KERN_INFO "wansock: Error, wrong reference count: %i !:listen.\n",
atomic_read(&sk->sk_refcnt));
}
sock_put(sk);
atomic_dec(&wanpipe_socks_nr);
}
/*============================================================
* wanpipe_do_bind
*
* Bottom half of the binding system call.
* Once the wanpipe_bind() function checks the
* legality of the call, this function binds the
* sock to the driver.
*===========================================================*/
static int wanpipe_do_bind(struct sock *sk, struct net_device *dev,
int protocol)
{
wanpipe_opt *wp = wp_sk(sk);
wanpipe_common_t *chan=NULL;
int err=0;
if (sock_flag(sk, SOCK_ZAPPED)) {
err = -EALREADY;
goto bind_unlock_exit;
}
wp->num = protocol;
if (protocol == 0){
release_device(dev);
err = -EINVAL;
goto bind_unlock_exit;
}
if (dev) {
if (dev->flags&IFF_UP) {
chan=dev->priv;
sk->sk_state = chan->state;
if (wp->num == htons(X25_PROT) &&
sk->sk_state != WANSOCK_DISCONNECTED &&
sk->sk_state != WANSOCK_CONNECTING) {
DBG_PRINTK(KERN_INFO
"wansock: Binding to Device not DISCONNECTED %i\n",
sk->sk_state);
release_device(dev);
err = -EAGAIN;
goto bind_unlock_exit;
}
wanpipe_link_driver(dev,sk);
sk->sk_bound_dev_if = dev->ifindex;
/* X25 Specific option */
if (wp->num == htons(X25_PROT))
wp_sk(sk)->svc = chan->svc;
} else {
sk->sk_err = ENETDOWN;
sk->sk_error_report(sk);
release_device(dev);
err = -EINVAL;
}
} else {
err = -ENODEV;
}
bind_unlock_exit:
/* FIXME where is this lock */
return err;
}
/*============================================================
* wanpipe_bind
*
* BIND() System call, which is bound to the AF_WANPIPE
* operations structure. It checks for correct wanpipe
* card name, and cross references interface names with
* the card names. Thus, interface name must belong to
* the actual card.
*===========================================================*/
static int wanpipe_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
{
struct wan_sockaddr_ll *sll = (struct wan_sockaddr_ll*)uaddr;
struct sock *sk=sock->sk;
wanpipe_opt *wp = wp_sk(sk);
struct net_device *dev = NULL;
sdla_t *card=NULL;
char name[15];
/*
* Check legality
*/
if (addr_len < sizeof(struct wan_sockaddr_ll)){
printk(KERN_INFO "wansock: Address length error\n");
return -EINVAL;
}
if (sll->sll_family != AF_WANPIPE){
printk(KERN_INFO "wansock: Illegal family name specified.\n");
return -EINVAL;
}
card = wanpipe_find_card (sll->sll_card);
if (!card){
printk(KERN_INFO "wansock: Wanpipe card not found: %s\n",sll->sll_card);
return -ENODEV;
}else{
wp_sk(sk)->card = (void *)card;
}
if (!strcmp(sll->sll_device,"svc_listen")){
/* Bind a sock to a card structure for listening
*/
int err=0;
/* This is x25 specific area if protocol doesn't
* match, return error */
if (sll->sll_protocol != htons(X25_PROT))
return -EINVAL;
err= wanpipe_link_card (sk);
if (err < 0)
return err;
if (sll->sll_protocol)
wp->num = sll->sll_protocol;
sk->sk_state = WANSOCK_BIND_LISTEN;
return 0;
}else if (!strcmp(sll->sll_device,"svc_connect")){
/* This is x25 specific area if protocol doesn't
* match, return error */
if (sll->sll_protocol != htons(X25_PROT))
return -EINVAL;
/* Find a free device
*/
dev = wanpipe_find_free_dev(card);
if (dev == NULL){
DBG_PRINTK(KERN_INFO "wansock: No free network devices for card %s\n",
card->devname);
return -EINVAL;
}
}else{
/* Bind a socket to a interface name
* This is used by PVC mostly
*/
strlcpy(name,sll->sll_device,sizeof(name));
dev = dev_get_by_name(name);
if (dev == NULL){
printk(KERN_INFO "wansock: Failed to get Dev from name: %s,\n",
name);
return -ENODEV;
}
dev_put(dev);
if (check_dev(dev, card)){
printk(KERN_INFO "wansock: Device %s, doesn't belong to card %s\n",
dev->name, card->devname);
return -EINVAL;
}
if (get_atomic_device (dev))
return -EINVAL;
}
return wanpipe_do_bind(sk, dev, sll->sll_protocol ? : wp->num);
}
/*============================================================
* get_atomic_device
*
* Sets a bit atomically which indicates that
* the interface is taken. This avoids race conditions.
*===========================================================*/
static inline int get_atomic_device(struct net_device *dev)
{
wanpipe_common_t *chan = dev->priv;
if (!test_and_set_bit(0,(void *)&chan->rw_bind)){
return 0;
}
return 1;
}
/*============================================================
* check_dev
*
* Check that device name belongs to a particular card.
*===========================================================*/
static int check_dev(struct net_device *dev, sdla_t *card)
{
struct net_device* tmp_dev;
for (tmp_dev = card->wandev.dev; tmp_dev;
tmp_dev = *((struct net_device **)tmp_dev->priv)) {
if (tmp_dev->ifindex == dev->ifindex){
return 0;
}
}
return 1;
}
/*============================================================
* wanpipe_find_free_dev
*
* Find a free network interface. If found set atomic
* bit indicating that the interface is taken.
* X25API Specific.
*===========================================================*/
struct net_device *wanpipe_find_free_dev(sdla_t *card)
{
struct net_device* dev;
volatile wanpipe_common_t *chan;
if (test_and_set_bit(0,&find_free_critical)){
printk(KERN_INFO "CRITICAL in Find Free\n");
}
for (dev = card->wandev.dev; dev;
dev = *((struct net_device **)dev->priv)) {
chan = dev->priv;
if (!chan)
continue;
if (chan->usedby == API && chan->svc){
if (!get_atomic_device (dev)){
if (chan->state != WANSOCK_DISCONNECTED){
release_device(dev);
}else{
clear_bit(0,&find_free_critical);
return dev;
}
}
}
}
clear_bit(0,&find_free_critical);
return NULL;
}
/*============================================================
* wanpipe_create
*
* SOCKET() System call. It allocates a sock structure
* and adds the socket to the wanpipe_sk_list.
* Crates AF_WANPIPE socket.
*===========================================================*/
static int wanpipe_create(struct socket *sock, int protocol)
{
struct sock *sk;
//FIXME: This checks for root user, SECURITY ?
//if (!capable(CAP_NET_RAW))
// return -EPERM;
if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW)
return -ESOCKTNOSUPPORT;
sock->state = SS_UNCONNECTED;
if ((sk = wanpipe_alloc_socket()) == NULL)
return -ENOBUFS;
sk->sk_reuse = 1;
sock->ops = &wanpipe_ops;
sock_init_data(sock,sk);
sock_reset_flag(sk, SOCK_ZAPPED);
sk->sk_family = PF_WANPIPE;
wp_sk(sk)->num = protocol;
sk->sk_state = WANSOCK_DISCONNECTED;
sk->sk_ack_backlog = 0;
sk->sk_bound_dev_if = 0;
atomic_inc(&wanpipe_socks_nr);
/* We must disable interrupts because the ISR
* can also change the list */
set_bit(1,&wanpipe_tx_critical);
write_lock(&wanpipe_sklist_lock);
sk_add_node(sk, &wanpipe_sklist);
write_unlock(&wanpipe_sklist_lock);
clear_bit(1,&wanpipe_tx_critical);
return(0);
}
/*============================================================
* wanpipe_recvmsg
*
* Pull a packet from our receive queue and hand it
* to the user. If necessary we block.
*===========================================================*/
static int wanpipe_recvmsg(struct kiocb *iocb, struct socket *sock,
struct msghdr *msg, int len, int flags)
{
struct sock *sk = sock->sk;
struct sk_buff *skb;
int copied, err=-ENOBUFS;
/*
* If the address length field is there to be filled in, we fill
* it in now.
*/
msg->msg_namelen = sizeof(struct wan_sockaddr_ll);
/*
* 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.
*/
if (flags & MSG_OOB){
skb = skb_dequeue(&sk->sk_error_queue);
}else{
skb=skb_recv_datagram(sk,flags,1,&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;
}
wanpipe_wakeup_driver(sk);
/* We can't use skb_copy_datagram here */
err = memcpy_toiovec(msg->msg_iov, skb->data, copied);
if (err)
goto out_free;
sock_recv_timestamp(msg, sk, skb);
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 = (flags&MSG_TRUNC) ? skb->len : copied;
out_free:
skb_free_datagram(sk, skb);
out:
return err;
}
/*============================================================
* wanpipe_wakeup_driver
*
* If socket receive buffer is full and driver cannot
* pass data up the sock, it sets a packet_block flag.
* This function check that flag and if sock receive
* queue has room it kicks the driver BH handler.
*
* This way, driver doesn't have to poll the sock
* receive queue.
*===========================================================*/
static void wanpipe_wakeup_driver(struct sock *sk)
{
struct net_device *dev = NULL;
wanpipe_common_t *chan=NULL;
dev = dev_get_by_index(sk->sk_bound_dev_if);
if (!dev)
return;
dev_put(dev);
if ((chan = dev->priv) == NULL)
return;
if (atomic_read(&chan->receive_block)){
if (atomic_read(&sk->sk_rmem_alloc) <
((unsigned)sk->sk_rcvbuf * 0.9)) {
printk(KERN_INFO "wansock: Queuing task for wanpipe\n");
atomic_set(&chan->receive_block,0);
wanpipe_queue_tq(&chan->wanpipe_task);
wanpipe_mark_bh();
}
}
}
/*============================================================
* wanpipe_getname
*
* I don't know what to do with this yet.
* User can use this function to get sock address
* information. Not very useful for Sangoma's purposes.
*===========================================================*/
static int wanpipe_getname(struct socket *sock, struct sockaddr *uaddr,
int *uaddr_len, int peer)
{
struct net_device *dev;
struct sock *sk = sock->sk;
struct wan_sockaddr_ll *sll = (struct wan_sockaddr_ll*)uaddr;
sll->sll_family = AF_WANPIPE;
sll->sll_ifindex = sk->sk_bound_dev_if;
sll->sll_protocol = wp_sk(sk)->num;
dev = dev_get_by_index(sk->sk_bound_dev_if);
if (dev) {
sll->sll_hatype = dev->type;
sll->sll_halen = dev->addr_len;
memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len);
} else {
sll->sll_hatype = 0; /* Bad: we have no ARPHRD_UNSPEC */
sll->sll_halen = 0;
}
*uaddr_len = sizeof(*sll);
dev_put(dev);
return 0;
}
/*============================================================
* wanpipe_notifier
*
* If driver turns off network interface, this function
* will be envoked. Currently I treate it as a
* call disconnect. More thought should go into this
* function.
*
* FIXME: More thought should go into this function.
*
*===========================================================*/
static int wanpipe_notifier(struct notifier_block *this, unsigned long msg, void *data)
{
struct sock *sk;
hlist_node *node;
struct net_device *dev = (struct net_device *)data;
sk_for_each(sk, node, &wanpipe_sklist) {
struct wanpipe_opt *po = wp_sk(sk);
if (!po)
continue;
if (dev == NULL)
continue;
switch (msg) {
case NETDEV_DOWN:
case NETDEV_UNREGISTER:
if (dev->ifindex == sk->sk_bound_dev_if) {
printk(KERN_INFO "wansock: Device down %s\n",dev->name);
if (sock_flag(sk, SOCK_ZAPPED)) {
wanpipe_unlink_driver(sk);
sk->sk_err = ENETDOWN;
sk->sk_error_report(sk);
}
if (msg == NETDEV_UNREGISTER) {
printk(KERN_INFO "wansock: Unregistering Device: %s\n",
dev->name);
wanpipe_unlink_driver(sk);
sk->sk_bound_dev_if = 0;
}
}
break;
case NETDEV_UP:
if (dev->ifindex == sk->sk_bound_dev_if &&
po->num && !sock_flag(sk, SOCK_ZAPPED)) {
printk(KERN_INFO "wansock: Registering Device: %s\n",
dev->name);
wanpipe_link_driver(dev,sk);
}
break;
}
}
return NOTIFY_DONE;
}
/*============================================================
* wanpipe_ioctl
*
* Execute a user commands, and set socket options.
*
* FIXME: More thought should go into this function.
*
*===========================================================*/
static int wanpipe_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
{
struct sock *sk = sock->sk;
int err;
switch(cmd)
{
case SIOCGSTAMP:
return sock_get_timestamp(sk, (struct timeval __user *)arg);
case SIOC_WANPIPE_CHECK_TX:
return atomic_read(&sk->sk_wmem_alloc);
case SIOC_WANPIPE_SOCK_STATE:
if (sk->sk_state == WANSOCK_CONNECTED)
return 0;
return 1;
case SIOC_WANPIPE_GET_CALL_DATA:
return get_ioctl_cmd (sk,(void*)arg);
case SIOC_WANPIPE_SET_CALL_DATA:
return set_ioctl_cmd (sk,(void*)arg);
case SIOC_WANPIPE_ACCEPT_CALL:
case SIOC_WANPIPE_CLEAR_CALL:
case SIOC_WANPIPE_RESET_CALL:
if ((err=set_ioctl_cmd(sk,(void*)arg)) < 0)
return err;
err=wanpipe_exec_cmd(sk,cmd,0);
get_ioctl_cmd(sk,(void*)arg);
return err;
case SIOC_WANPIPE_DEBUG:
return wanpipe_debug(sk,(void*)arg);
case SIOC_WANPIPE_SET_NONBLOCK:
if (sk->sk_state != WANSOCK_DISCONNECTED)
return -EINVAL;
sock->file->f_flags |= O_NONBLOCK;
return 0;
#ifdef CONFIG_INET
case SIOCADDRT:
case SIOCDELRT:
case SIOCDARP:
case SIOCGARP:
case SIOCSARP:
case SIOCDRARP:
case SIOCGRARP:
case SIOCSRARP:
case SIOCGIFADDR:
case SIOCSIFADDR:
case SIOCGIFBRDADDR:
case SIOCSIFBRDADDR:
case SIOCGIFNETMASK:
case SIOCSIFNETMASK:
case SIOCGIFDSTADDR:
case SIOCSIFDSTADDR:
case SIOCSIFFLAGS:
return inet_dgram_ops.ioctl(sock, cmd, arg);
#endif
default:
return dev_ioctl(cmd,(void __user *) arg);
}
/*NOTREACHED*/
}
/*============================================================
* wanpipe_debug
*
* This function will pass up information about all
* active sockets.
*
* FIXME: More thought should go into this function.
*
*===========================================================*/
static int wanpipe_debug (struct sock *origsk, void *arg)
{
struct sock *sk;
struct hlist_node *node;
struct net_device *dev = NULL;
wanpipe_common_t *chan=NULL;
int cnt=0, err=0;
wan_debug_t *dbg_data = (wan_debug_t *)arg;
sk_for_each(sk, node, &wanpipe_sklist) {
wanpipe_opt *wp = wp_sk(sk);
if (sk == origsk){
continue;
}
if ((err=put_user(1, &dbg_data->debug[cnt].free)))
return err;
if ((err = put_user(sk->sk_state,
&dbg_data->debug[cnt].state_sk)))
return err;
if ((err = put_user(sk->sk_rcvbuf,
&dbg_data->debug[cnt].rcvbuf)))
return err;
if ((err = put_user(atomic_read(&sk->sk_rmem_alloc),
&dbg_data->debug[cnt].rmem)))
return err;
if ((err = put_user(atomic_read(&sk->sk_wmem_alloc),
&dbg_data->debug[cnt].wmem)))
return err;
if ((err = put_user(sk->sk_sndbuf,
&dbg_data->debug[cnt].sndbuf)))
return err;
if ((err=put_user(sk_count, &dbg_data->debug[cnt].sk_count)))
return err;
if ((err=put_user(wp->poll_cnt, &dbg_data->debug[cnt].poll_cnt)))
return err;
if ((err = put_user(sk->sk_bound_dev_if,
&dbg_data->debug[cnt].bound)))
return err;
if (sk->sk_bound_dev_if) {
dev = dev_get_by_index(sk->sk_bound_dev_if);
if (!dev)
continue;
chan=dev->priv;
dev_put(dev);
if ((err=put_user(chan->state, &dbg_data->debug[cnt].d_state)))
return err;
if ((err=put_user(chan->svc, &dbg_data->debug[cnt].svc)))
return err;
if ((err=put_user(atomic_read(&chan->command),
&dbg_data->debug[cnt].command)))
return err;
if (wp){
sdla_t *card = (sdla_t*)wp->card;
if (card){
if ((err=put_user(atomic_read(&card->u.x.command_busy),
&dbg_data->debug[cnt].cmd_busy)))
return err;
}
if ((err=put_user(wp->lcn,
&dbg_data->debug[cnt].lcn)))
return err;
if (wp->mbox) {
if ((err=put_user(1, &dbg_data->debug[cnt].mbox)))
return err;
}
}
if ((err=put_user(atomic_read(&chan->receive_block),
&dbg_data->debug[cnt].rblock)))
return err;
if (copy_to_user(dbg_data->debug[cnt].name, dev->name, strlen(dev->name)))
return -EFAULT;
}
if (++cnt == MAX_NUM_DEBUG)
break;
}
return 0;
}
/*============================================================
* get_ioctl_cmd
*
* Pass up the contents of socket MBOX to the user.
*===========================================================*/
static int get_ioctl_cmd (struct sock *sk, void *arg)
{
x25api_t *usr_data = (x25api_t *)arg;
mbox_cmd_t *mbox_ptr;
int err;
if (usr_data == NULL)
return -EINVAL;
if (!wp_sk(sk)->mbox) {
return -EINVAL;
}
mbox_ptr = (mbox_cmd_t *)wp_sk(sk)->mbox;
if ((err=put_user(mbox_ptr->cmd.qdm, &usr_data->hdr.qdm)))
return err;
if ((err=put_user(mbox_ptr->cmd.cause, &usr_data->hdr.cause)))
return err;
if ((err=put_user(mbox_ptr->cmd.diagn, &usr_data->hdr.diagn)))
return err;
if ((err=put_user(mbox_ptr->cmd.length, &usr_data->hdr.length)))
return err;
if ((err=put_user(mbox_ptr->cmd.result, &usr_data->hdr.result)))
return err;
if ((err=put_user(mbox_ptr->cmd.lcn, &usr_data->hdr.lcn)))
return err;
if (mbox_ptr->cmd.length > 0){
if (mbox_ptr->cmd.length > X25_MAX_DATA)
return -EINVAL;
if (copy_to_user(usr_data->data, mbox_ptr->data, mbox_ptr->cmd.length)){
printk(KERN_INFO "wansock: Copy failed !!!\n");
return -EFAULT;
}
}
return 0;
}
/*============================================================
* set_ioctl_cmd
*
* Before command can be execute, socket MBOX must
* be created, and initialized with user data.
*===========================================================*/
static int set_ioctl_cmd (struct sock *sk, void *arg)
{
x25api_t *usr_data = (x25api_t *)arg;
mbox_cmd_t *mbox_ptr;
int err;
if (!wp_sk(sk)->mbox) {
void *mbox_ptr;
struct net_device *dev = dev_get_by_index(sk->sk_bound_dev_if);
if (!dev)
return -ENODEV;
dev_put(dev);
if ((mbox_ptr = kmalloc(sizeof(mbox_cmd_t), GFP_ATOMIC)) == NULL)
return -ENOMEM;
memset(mbox_ptr, 0, sizeof(mbox_cmd_t));
wp_sk(sk)->mbox = mbox_ptr;
wanpipe_link_driver(dev,sk);
}
mbox_ptr = (mbox_cmd_t*)wp_sk(sk)->mbox;
memset(mbox_ptr, 0, sizeof(mbox_cmd_t));
if (usr_data == NULL){
return 0;
}
if ((err=get_user(mbox_ptr->cmd.qdm, &usr_data->hdr.qdm)))
return err;
if ((err=get_user(mbox_ptr->cmd.cause, &usr_data->hdr.cause)))
return err;
if ((err=get_user(mbox_ptr->cmd.diagn, &usr_data->hdr.diagn)))
return err;
if ((err=get_user(mbox_ptr->cmd.length, &usr_data->hdr.length)))
return err;
if ((err=get_user(mbox_ptr->cmd.result, &usr_data->hdr.result)))
return err;
if (mbox_ptr->cmd.length > 0){
if (mbox_ptr->cmd.length > X25_MAX_DATA)
return -EINVAL;
if (copy_from_user(mbox_ptr->data, usr_data->data, mbox_ptr->cmd.length)){
printk(KERN_INFO "Copy failed\n");
return -EFAULT;
}
}
return 0;
}
/*======================================================================
* wanpipe_poll
*
* Datagram poll: Again totally generic. This also handles
* sequenced packet sockets providing the socket receive queue
* is only ever holding data ready to receive.
*
* Note: when you _don't_ use this routine for this protocol,
* and you use a different write policy from sock_writeable()
* then please supply your own write_space callback.
*=====================================================================*/
unsigned int wanpipe_poll(struct file * file, struct socket *sock, poll_table *wait)
{
struct sock *sk = sock->sk;
unsigned int mask;
++wp_sk(sk)->poll_cnt;
poll_wait(file, sk->sk_sleep, wait);
mask = 0;
/* exceptional events? */
if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue)) {
mask |= POLLPRI;
return mask;
}
if (sk->sk_shutdown & RCV_SHUTDOWN)
mask |= POLLHUP;
/* readable? */
if (!skb_queue_empty(&sk->sk_receive_queue)) {
mask |= POLLIN | POLLRDNORM;
}
/* connection hasn't started yet */
if (sk->sk_state == WANSOCK_CONNECTING) {
return mask;
}
if (sk->sk_state == WANSOCK_DISCONNECTED) {
mask = POLLPRI;
return mask;
}
/* This check blocks the user process if there is
* a packet already queued in the socket write queue.
* This option is only for X25API protocol, for other
* protocol like chdlc enable streaming mode,
* where multiple packets can be pending in the socket
* transmit queue */
if (wp_sk(sk)->num == htons(X25_PROT)) {
if (atomic_read(&wp_sk(sk)->packet_sent))
return mask;
}
/* writable? */
if (sock_writeable(sk)){
mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
}else{
set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
}
return mask;
}
/*======================================================================
* wanpipe_listen
*
* X25API Specific function. Set a socket into LISTENING MODE.
*=====================================================================*/
static int wanpipe_listen(struct socket *sock, int backlog)
{
struct sock *sk = sock->sk;
/* This is x25 specific area if protocol doesn't
* match, return error */
if (wp_sk(sk)->num != htons(X25_PROT))
return -EINVAL;
if (sk->sk_state == WANSOCK_BIND_LISTEN) {
sk->sk_max_ack_backlog = backlog;
sk->sk_state = WANSOCK_LISTEN;
return 0;
}else{
printk(KERN_INFO "wansock: Listening sock was not binded\n");
}
return -EINVAL;
}
/*======================================================================
* wanpipe_link_card
*
* Connects the listening socket to the driver
*=====================================================================*/
static int wanpipe_link_card (struct sock *sk)
{
sdla_t *card = (sdla_t*)wp_sk(sk)->card;
if (!card)
return -ENOMEM;
if ((card->sk != NULL) || (card->func != NULL)){
printk(KERN_INFO "wansock: Listening queue is already established\n");
return -EINVAL;
}
card->sk=sk;
card->func=wanpipe_listen_rcv;
sock_set_flag(sk, SOCK_ZAPPED);
return 0;
}
/*======================================================================
* wanpipe_listen
*
* X25API Specific function. Disconnect listening socket from
* the driver.
*=====================================================================*/
static void wanpipe_unlink_card (struct sock *sk)
{
sdla_t *card = (sdla_t*)wp_sk(sk)->card;
if (card){
card->sk=NULL;
card->func=NULL;
}
}
/*======================================================================
* wanpipe_exec_cmd
*
* Ioctl function calls this function to execute user command.
* Connect() sytem call also calls this function to execute
* place call. This function blocks until command is executed.
*=====================================================================*/
static int wanpipe_exec_cmd(struct sock *sk, int cmd, unsigned int flags)
{
int err = -EINVAL;
wanpipe_opt *wp = wp_sk(sk);
mbox_cmd_t *mbox_ptr = (mbox_cmd_t*)wp->mbox;
if (!mbox_ptr){
printk(KERN_INFO "NO MBOX PTR !!!!!\n");
return -EINVAL;
}
/* This is x25 specific area if protocol doesn't
* match, return error */
if (wp->num != htons(X25_PROT))
return -EINVAL;
switch (cmd){
case SIOC_WANPIPE_ACCEPT_CALL:
if (sk->sk_state != WANSOCK_CONNECTING) {
err = -EHOSTDOWN;
break;
}
err = execute_command(sk,X25_ACCEPT_CALL,0);
if (err < 0)
break;
/* Update. Mar6 2000.
* Do not set the sock lcn number here, since
* it is done in wanpipe_listen_rcv().
*/
if (sk->sk_state == WANSOCK_CONNECTED) {
wp->lcn = ((mbox_cmd_t*)wp->mbox)->cmd.lcn;
DBG_PRINTK(KERN_INFO "\nwansock: Accept OK %i\n",
wp->lcn);
err = 0;
}else{
DBG_PRINTK (KERN_INFO "\nwansock: Accept Failed %i\n",
wp->lcn);
wp->lcn = 0;
err = -ECONNREFUSED;
}
break;
case SIOC_WANPIPE_CLEAR_CALL:
if (sk->sk_state == WANSOCK_DISCONNECTED) {
err = -EINVAL;
break;
}
/* Check if data buffers are pending for transmission,
* if so, check whether user wants to wait until data
* is transmitted, or clear a call and drop packets */
if (atomic_read(&sk->sk_wmem_alloc) ||
check_driver_busy(sk)) {
mbox_cmd_t *mbox = wp->mbox;
if (mbox->cmd.qdm & 0x80){
mbox->cmd.result = 0x35;
err = -EAGAIN;
break;
}
}
sk->sk_state = WANSOCK_DISCONNECTING;
err = execute_command(sk,X25_CLEAR_CALL,0);
if (err < 0)
break;
err = -ECONNREFUSED;
if (sk->sk_state == WANSOCK_DISCONNECTED) {
DBG_PRINTK(KERN_INFO "\nwansock: CLEAR OK %i\n",
wp->lcn);
wp->lcn = 0;
err = 0;
}
break;
case SIOC_WANPIPE_RESET_CALL:
if (sk->sk_state != WANSOCK_CONNECTED) {
err = -EINVAL;
break;
}
/* Check if data buffers are pending for transmission,
* if so, check whether user wants to wait until data
* is transmitted, or reset a call and drop packets */
if (atomic_read(&sk->sk_wmem_alloc) ||
check_driver_busy(sk)) {
mbox_cmd_t *mbox = wp->mbox;
if (mbox->cmd.qdm & 0x80){
mbox->cmd.result = 0x35;
err = -EAGAIN;
break;
}
}
err = execute_command(sk, X25_RESET,0);
if (err < 0)
break;
err = mbox_ptr->cmd.result;
break;
case X25_PLACE_CALL:
err=execute_command(sk,X25_PLACE_CALL,flags);
if (err < 0)
break;
if (sk->sk_state == WANSOCK_CONNECTED) {
wp->lcn = ((mbox_cmd_t*)wp->mbox)->cmd.lcn;
DBG_PRINTK(KERN_INFO "\nwansock: PLACE CALL OK %i\n",
wp->lcn);
err = 0;
} else if (sk->sk_state == WANSOCK_CONNECTING &&
(flags & O_NONBLOCK)) {
wp->lcn = ((mbox_cmd_t*)wp->mbox)->cmd.lcn;
DBG_PRINTK(KERN_INFO "\nwansock: Place Call OK: Waiting %i\n",
wp->lcn);
err = 0;
}else{
DBG_PRINTK(KERN_INFO "\nwansock: Place call Failed\n");
err = -ECONNREFUSED;
}
break;
default:
return -EINVAL;
}
return err;
}
static int check_driver_busy (struct sock *sk)
{
struct net_device *dev = dev_get_by_index(sk->sk_bound_dev_if);
wanpipe_common_t *chan;
if (!dev)
return 0;
dev_put(dev);
if ((chan=dev->priv) == NULL)
return 0;
return atomic_read(&chan->driver_busy);
}
/*======================================================================
* wanpipe_accept
*
* ACCEPT() System call. X25API Specific function.
* For each incoming call, create a new socket and
* return it to the user.
*=====================================================================*/
static int wanpipe_accept(struct socket *sock, struct socket *newsock, int flags)
{
struct sock *sk;
struct sock *newsk;
struct sk_buff *skb;
DECLARE_WAITQUEUE(wait, current);
int err=0;
if (newsock->sk != NULL){
wanpipe_kill_sock_accept(newsock->sk);
newsock->sk=NULL;
}
if ((sk = sock->sk) == NULL)
return -EINVAL;
if (sk->sk_type != SOCK_RAW)
return -EOPNOTSUPP;
if (sk->sk_state != WANSOCK_LISTEN)
return -EINVAL;
if (wp_sk(sk)->num != htons(X25_PROT))
return -EINVAL;
add_wait_queue(sk->sk_sleep,&wait);
current->state = TASK_INTERRUPTIBLE;
for (;;){
skb = skb_dequeue(&sk->sk_receive_queue);
if (skb){
err=0;
break;
}
if (signal_pending(current)) {
err = -ERESTARTSYS;
break;
}
schedule();
}
current->state = TASK_RUNNING;
remove_wait_queue(sk->sk_sleep,&wait);
if (err != 0)
return err;
newsk = get_newsk_from_skb(skb);
if (!newsk){
return -EINVAL;
}
set_bit(1,&wanpipe_tx_critical);
write_lock(&wanpipe_sklist_lock);
sk_add_node(newsk, &wanpipe_sklist);
write_unlock(&wanpipe_sklist_lock);
clear_bit(1,&wanpipe_tx_critical);
newsk->sk_socket = newsock;
newsk->sk_sleep = &newsock->wait;
/* Now attach up the new socket */
sk->sk_ack_backlog--;
newsock->sk = newsk;
kfree_skb(skb);
DBG_PRINTK(KERN_INFO "\nwansock: ACCEPT Got LCN %i\n",
wp_sk(newsk)->lcn);
return 0;
}
/*======================================================================
* get_newsk_from_skb
*
* Accept() uses this function to get the address of the new
* socket structure.
*=====================================================================*/
struct sock * get_newsk_from_skb (struct sk_buff *skb)
{
struct net_device *dev = skb->dev;
wanpipe_common_t *chan;
if (!dev){
return NULL;
}
if ((chan = dev->priv) == NULL){
return NULL;
}
if (!chan->sk){
return NULL;
}
return (struct sock *)chan->sk;
}
/*======================================================================
* wanpipe_connect
*
* CONNECT() System Call. X25API specific function
* Check the state of the sock, and execute PLACE_CALL command.
* Connect can ether block or return without waiting for connection,
* if specified by user.
*=====================================================================*/
static int wanpipe_connect(struct socket *sock, struct sockaddr *uaddr, int addr_len, int flags)
{
struct sock *sk = sock->sk;
struct wan_sockaddr_ll *addr = (struct wan_sockaddr_ll*)uaddr;
struct net_device *dev;
int err;
if (wp_sk(sk)->num != htons(X25_PROT))
return -EINVAL;
if (sk->sk_state == WANSOCK_CONNECTED)
return -EISCONN; /* No reconnect on a seqpacket socket */
if (sk->sk_state != WAN_DISCONNECTED) {
printk(KERN_INFO "wansock: Trying to connect on channel NON DISCONNECT\n");
return -ECONNREFUSED;
}
sk->sk_state = WANSOCK_DISCONNECTED;
sock->state = SS_UNCONNECTED;
if (addr_len != sizeof(struct wan_sockaddr_ll))
return -EINVAL;
if (addr->sll_family != AF_WANPIPE)
return -EINVAL;
if ((dev = dev_get_by_index(sk->sk_bound_dev_if)) == NULL)
return -ENETUNREACH;
dev_put(dev);
if (!sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
return -EINVAL;
sock->state = SS_CONNECTING;
sk->sk_state = WANSOCK_CONNECTING;
if (!wp_sk(sk)->mbox) {
if (wp_sk (sk)->svc)
return -EINVAL;
else {
int err;
if ((err=set_ioctl_cmd(sk,NULL)) < 0)
return err;
}
}
if ((err=wanpipe_exec_cmd(sk, X25_PLACE_CALL,flags)) != 0){
sock->state = SS_UNCONNECTED;
sk->sk_state = WANSOCK_CONNECTED;
return err;
}
if (sk->sk_state != WANSOCK_CONNECTED && (flags & O_NONBLOCK)) {
return 0;
}
if (sk->sk_state != WANSOCK_CONNECTED) {
sock->state = SS_UNCONNECTED;
return -ECONNREFUSED;
}
sock->state = SS_CONNECTED;
return 0;
}
struct proto_ops wanpipe_ops = {
.family = PF_WANPIPE,
.owner = THIS_MODULE,
.release = wanpipe_release,
.bind = wanpipe_bind,
.connect = wanpipe_connect,
.socketpair = sock_no_socketpair,
.accept = wanpipe_accept,
.getname = wanpipe_getname,
.poll = wanpipe_poll,
.ioctl = wanpipe_ioctl,
.listen = wanpipe_listen,
.shutdown = sock_no_shutdown,
.setsockopt = sock_no_setsockopt,
.getsockopt = sock_no_getsockopt,
.sendmsg = wanpipe_sendmsg,
.recvmsg = wanpipe_recvmsg
};
static struct net_proto_family wanpipe_family_ops = {
.family = PF_WANPIPE,
.create = wanpipe_create,
.owner = THIS_MODULE,
};
struct notifier_block wanpipe_netdev_notifier = {
.notifier_call = wanpipe_notifier,
};
#ifdef MODULE
void cleanup_module(void)
{
printk(KERN_INFO "wansock: Cleaning up \n");
unregister_netdevice_notifier(&wanpipe_netdev_notifier);
sock_unregister(PF_WANPIPE);
proto_unregister(&wanpipe_proto);
}
int init_module(void)
{
int rc;
printk(KERN_INFO "wansock: Registering Socket \n");
rc = proto_register(&wanpipe_proto, 0);
if (rc != 0)
goto out;
sock_register(&wanpipe_family_ops);
register_netdevice_notifier(&wanpipe_netdev_notifier);
out:
return rc;
}
#endif
MODULE_LICENSE("GPL");
MODULE_ALIAS_NETPROTO(PF_WANPIPE);
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