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isdn_ppp.c
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isdn_ppp.c
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/* $Id: isdn_ppp.c,v 1.1.2.3 2004/02/10 01:07:13 keil Exp $
*
* Linux ISDN subsystem, functions for synchronous PPP (linklevel).
*
* Copyright 1995,96 by Michael Hipp (Michael.Hipp@student.uni-tuebingen.de)
*
* This software may be used and distributed according to the terms
* of the GNU General Public License, incorporated herein by reference.
*
*/
#include <linux/isdn.h>
#include <linux/poll.h>
#include <linux/ppp-comp.h>
#include <linux/slab.h>
#ifdef CONFIG_IPPP_FILTER
#include <linux/filter.h>
#endif
#include "isdn_common.h"
#include "isdn_ppp.h"
#include "isdn_net.h"
#ifndef PPP_IPX
#define PPP_IPX 0x002b
#endif
/* Prototypes */
static int isdn_ppp_fill_rq(unsigned char *buf, int len, int proto, int slot);
static int isdn_ppp_closewait(int slot);
static void isdn_ppp_push_higher(isdn_net_dev *net_dev, isdn_net_local *lp,
struct sk_buff *skb, int proto);
static int isdn_ppp_if_get_unit(char *namebuf);
static int isdn_ppp_set_compressor(struct ippp_struct *is, struct isdn_ppp_comp_data *);
static struct sk_buff *isdn_ppp_decompress(struct sk_buff *,
struct ippp_struct *, struct ippp_struct *, int *proto);
static void isdn_ppp_receive_ccp(isdn_net_dev *net_dev, isdn_net_local *lp,
struct sk_buff *skb, int proto);
static struct sk_buff *isdn_ppp_compress(struct sk_buff *skb_in, int *proto,
struct ippp_struct *is, struct ippp_struct *master, int type);
static void isdn_ppp_send_ccp(isdn_net_dev *net_dev, isdn_net_local *lp,
struct sk_buff *skb);
/* New CCP stuff */
static void isdn_ppp_ccp_kickup(struct ippp_struct *is);
static void isdn_ppp_ccp_xmit_reset(struct ippp_struct *is, int proto,
unsigned char code, unsigned char id,
unsigned char *data, int len);
static struct ippp_ccp_reset *isdn_ppp_ccp_reset_alloc(struct ippp_struct *is);
static void isdn_ppp_ccp_reset_free(struct ippp_struct *is);
static void isdn_ppp_ccp_reset_free_state(struct ippp_struct *is,
unsigned char id);
static void isdn_ppp_ccp_timer_callback(unsigned long closure);
static struct ippp_ccp_reset_state *isdn_ppp_ccp_reset_alloc_state(struct ippp_struct *is,
unsigned char id);
static void isdn_ppp_ccp_reset_trans(struct ippp_struct *is,
struct isdn_ppp_resetparams *rp);
static void isdn_ppp_ccp_reset_ack_rcvd(struct ippp_struct *is,
unsigned char id);
#ifdef CONFIG_ISDN_MPP
static ippp_bundle *isdn_ppp_bundle_arr = NULL;
static int isdn_ppp_mp_bundle_array_init(void);
static int isdn_ppp_mp_init(isdn_net_local *lp, ippp_bundle *add_to);
static void isdn_ppp_mp_receive(isdn_net_dev *net_dev, isdn_net_local *lp,
struct sk_buff *skb);
static void isdn_ppp_mp_cleanup(isdn_net_local *lp);
static int isdn_ppp_bundle(struct ippp_struct *, int unit);
#endif /* CONFIG_ISDN_MPP */
char *isdn_ppp_revision = "$Revision: 1.1.2.3 $";
static struct ippp_struct *ippp_table[ISDN_MAX_CHANNELS];
static struct isdn_ppp_compressor *ipc_head = NULL;
/*
* frame log (debug)
*/
static void
isdn_ppp_frame_log(char *info, char *data, int len, int maxlen, int unit, int slot)
{
int cnt,
j,
i;
char buf[80];
if (len < maxlen)
maxlen = len;
for (i = 0, cnt = 0; cnt < maxlen; i++) {
for (j = 0; j < 16 && cnt < maxlen; j++, cnt++)
sprintf(buf + j * 3, "%02x ", (unsigned char)data[cnt]);
printk(KERN_DEBUG "[%d/%d].%s[%d]: %s\n", unit, slot, info, i, buf);
}
}
/*
* unbind isdn_net_local <=> ippp-device
* note: it can happen, that we hangup/free the master before the slaves
* in this case we bind another lp to the master device
*/
int
isdn_ppp_free(isdn_net_local *lp)
{
struct ippp_struct *is;
if (lp->ppp_slot < 0 || lp->ppp_slot >= ISDN_MAX_CHANNELS) {
printk(KERN_ERR "%s: ppp_slot(%d) out of range\n",
__func__, lp->ppp_slot);
return 0;
}
#ifdef CONFIG_ISDN_MPP
spin_lock(&lp->netdev->pb->lock);
#endif
isdn_net_rm_from_bundle(lp);
#ifdef CONFIG_ISDN_MPP
if (lp->netdev->pb->ref_ct == 1) /* last link in queue? */
isdn_ppp_mp_cleanup(lp);
lp->netdev->pb->ref_ct--;
spin_unlock(&lp->netdev->pb->lock);
#endif /* CONFIG_ISDN_MPP */
if (lp->ppp_slot < 0 || lp->ppp_slot >= ISDN_MAX_CHANNELS) {
printk(KERN_ERR "%s: ppp_slot(%d) now invalid\n",
__func__, lp->ppp_slot);
return 0;
}
is = ippp_table[lp->ppp_slot];
if ((is->state & IPPP_CONNECT))
isdn_ppp_closewait(lp->ppp_slot); /* force wakeup on ippp device */
else if (is->state & IPPP_ASSIGNED)
is->state = IPPP_OPEN; /* fallback to 'OPEN but not ASSIGNED' state */
if (is->debug & 0x1)
printk(KERN_DEBUG "isdn_ppp_free %d %lx %lx\n", lp->ppp_slot, (long) lp, (long) is->lp);
is->lp = NULL; /* link is down .. set lp to NULL */
lp->ppp_slot = -1; /* is this OK ?? */
return 0;
}
/*
* bind isdn_net_local <=> ippp-device
*
* This function is allways called with holding dev->lock so
* no additional lock is needed
*/
int
isdn_ppp_bind(isdn_net_local *lp)
{
int i;
int unit = 0;
struct ippp_struct *is;
int retval;
if (lp->pppbind < 0) { /* device bounded to ippp device ? */
isdn_net_dev *net_dev = dev->netdev;
char exclusive[ISDN_MAX_CHANNELS]; /* exclusive flags */
memset(exclusive, 0, ISDN_MAX_CHANNELS);
while (net_dev) { /* step through net devices to find exclusive minors */
isdn_net_local *lp = net_dev->local;
if (lp->pppbind >= 0)
exclusive[lp->pppbind] = 1;
net_dev = net_dev->next;
}
/*
* search a free device / slot
*/
for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
if (ippp_table[i]->state == IPPP_OPEN && !exclusive[ippp_table[i]->minor]) { /* OPEN, but not connected! */
break;
}
}
} else {
for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
if (ippp_table[i]->minor == lp->pppbind &&
(ippp_table[i]->state & IPPP_OPEN) == IPPP_OPEN)
break;
}
}
if (i >= ISDN_MAX_CHANNELS) {
printk(KERN_WARNING "isdn_ppp_bind: Can't find a (free) connection to the ipppd daemon.\n");
retval = -1;
goto out;
}
/* get unit number from interface name .. ugly! */
unit = isdn_ppp_if_get_unit(lp->netdev->dev->name);
if (unit < 0) {
printk(KERN_ERR "isdn_ppp_bind: illegal interface name %s.\n",
lp->netdev->dev->name);
retval = -1;
goto out;
}
lp->ppp_slot = i;
is = ippp_table[i];
is->lp = lp;
is->unit = unit;
is->state = IPPP_OPEN | IPPP_ASSIGNED; /* assigned to a netdevice but not connected */
#ifdef CONFIG_ISDN_MPP
retval = isdn_ppp_mp_init(lp, NULL);
if (retval < 0)
goto out;
#endif /* CONFIG_ISDN_MPP */
retval = lp->ppp_slot;
out:
return retval;
}
/*
* kick the ipppd on the device
* (wakes up daemon after B-channel connect)
*/
void
isdn_ppp_wakeup_daemon(isdn_net_local *lp)
{
if (lp->ppp_slot < 0 || lp->ppp_slot >= ISDN_MAX_CHANNELS) {
printk(KERN_ERR "%s: ppp_slot(%d) out of range\n",
__func__, lp->ppp_slot);
return;
}
ippp_table[lp->ppp_slot]->state = IPPP_OPEN | IPPP_CONNECT | IPPP_NOBLOCK;
wake_up_interruptible(&ippp_table[lp->ppp_slot]->wq);
}
/*
* there was a hangup on the netdevice
* force wakeup of the ippp device
* go into 'device waits for release' state
*/
static int
isdn_ppp_closewait(int slot)
{
struct ippp_struct *is;
if (slot < 0 || slot >= ISDN_MAX_CHANNELS) {
printk(KERN_ERR "%s: slot(%d) out of range\n",
__func__, slot);
return 0;
}
is = ippp_table[slot];
if (is->state)
wake_up_interruptible(&is->wq);
is->state = IPPP_CLOSEWAIT;
return 1;
}
/*
* isdn_ppp_find_slot / isdn_ppp_free_slot
*/
static int
isdn_ppp_get_slot(void)
{
int i;
for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
if (!ippp_table[i]->state)
return i;
}
return -1;
}
/*
* isdn_ppp_open
*/
int
isdn_ppp_open(int min, struct file *file)
{
int slot;
struct ippp_struct *is;
if (min < 0 || min >= ISDN_MAX_CHANNELS)
return -ENODEV;
slot = isdn_ppp_get_slot();
if (slot < 0) {
return -EBUSY;
}
is = file->private_data = ippp_table[slot];
printk(KERN_DEBUG "ippp, open, slot: %d, minor: %d, state: %04x\n",
slot, min, is->state);
/* compression stuff */
is->link_compressor = is->compressor = NULL;
is->link_decompressor = is->decompressor = NULL;
is->link_comp_stat = is->comp_stat = NULL;
is->link_decomp_stat = is->decomp_stat = NULL;
is->compflags = 0;
is->reset = isdn_ppp_ccp_reset_alloc(is);
if (!is->reset)
return -ENOMEM;
is->lp = NULL;
is->mp_seqno = 0; /* MP sequence number */
is->pppcfg = 0; /* ppp configuration */
is->mpppcfg = 0; /* mppp configuration */
is->last_link_seqno = -1; /* MP: maybe set to Bundle-MIN, when joining a bundle ?? */
is->unit = -1; /* set, when we have our interface */
is->mru = 1524; /* MRU, default 1524 */
is->maxcid = 16; /* VJ: maxcid */
is->tk = current;
init_waitqueue_head(&is->wq);
is->first = is->rq + NUM_RCV_BUFFS - 1; /* receive queue */
is->last = is->rq;
is->minor = min;
#ifdef CONFIG_ISDN_PPP_VJ
/*
* VJ header compression init
*/
is->slcomp = slhc_init(16, 16); /* not necessary for 2. link in bundle */
if (IS_ERR(is->slcomp)) {
isdn_ppp_ccp_reset_free(is);
return PTR_ERR(is->slcomp);
}
#endif
#ifdef CONFIG_IPPP_FILTER
is->pass_filter = NULL;
is->active_filter = NULL;
#endif
is->state = IPPP_OPEN;
return 0;
}
/*
* release ippp device
*/
void
isdn_ppp_release(int min, struct file *file)
{
int i;
struct ippp_struct *is;
if (min < 0 || min >= ISDN_MAX_CHANNELS)
return;
is = file->private_data;
if (!is) {
printk(KERN_ERR "%s: no file->private_data\n", __func__);
return;
}
if (is->debug & 0x1)
printk(KERN_DEBUG "ippp: release, minor: %d %lx\n", min, (long) is->lp);
if (is->lp) { /* a lp address says: this link is still up */
isdn_net_dev *p = is->lp->netdev;
if (!p) {
printk(KERN_ERR "%s: no lp->netdev\n", __func__);
return;
}
is->state &= ~IPPP_CONNECT; /* -> effect: no call of wakeup */
/*
* isdn_net_hangup() calls isdn_ppp_free()
* isdn_ppp_free() sets is->lp to NULL and lp->ppp_slot to -1
* removing the IPPP_CONNECT flag omits calling of isdn_ppp_wakeup_daemon()
*/
isdn_net_hangup(p->dev);
}
for (i = 0; i < NUM_RCV_BUFFS; i++) {
kfree(is->rq[i].buf);
is->rq[i].buf = NULL;
}
is->first = is->rq + NUM_RCV_BUFFS - 1; /* receive queue */
is->last = is->rq;
#ifdef CONFIG_ISDN_PPP_VJ
/* TODO: if this was the previous master: link the slcomp to the new master */
slhc_free(is->slcomp);
is->slcomp = NULL;
#endif
#ifdef CONFIG_IPPP_FILTER
if (is->pass_filter) {
bpf_prog_destroy(is->pass_filter);
is->pass_filter = NULL;
}
if (is->active_filter) {
bpf_prog_destroy(is->active_filter);
is->active_filter = NULL;
}
#endif
/* TODO: if this was the previous master: link the stuff to the new master */
if (is->comp_stat)
is->compressor->free(is->comp_stat);
if (is->link_comp_stat)
is->link_compressor->free(is->link_comp_stat);
if (is->link_decomp_stat)
is->link_decompressor->free(is->link_decomp_stat);
if (is->decomp_stat)
is->decompressor->free(is->decomp_stat);
is->compressor = is->link_compressor = NULL;
is->decompressor = is->link_decompressor = NULL;
is->comp_stat = is->link_comp_stat = NULL;
is->decomp_stat = is->link_decomp_stat = NULL;
/* Clean up if necessary */
if (is->reset)
isdn_ppp_ccp_reset_free(is);
/* this slot is ready for new connections */
is->state = 0;
}
/*
* get_arg .. ioctl helper
*/
static int
get_arg(void __user *b, void *val, int len)
{
if (len <= 0)
len = sizeof(void *);
if (copy_from_user(val, b, len))
return -EFAULT;
return 0;
}
/*
* set arg .. ioctl helper
*/
static int
set_arg(void __user *b, void *val, int len)
{
if (len <= 0)
len = sizeof(void *);
if (copy_to_user(b, val, len))
return -EFAULT;
return 0;
}
#ifdef CONFIG_IPPP_FILTER
static int get_filter(void __user *arg, struct sock_filter **p)
{
struct sock_fprog uprog;
struct sock_filter *code = NULL;
int len;
if (copy_from_user(&uprog, arg, sizeof(uprog)))
return -EFAULT;
if (!uprog.len) {
*p = NULL;
return 0;
}
/* uprog.len is unsigned short, so no overflow here */
len = uprog.len * sizeof(struct sock_filter);
code = memdup_user(uprog.filter, len);
if (IS_ERR(code))
return PTR_ERR(code);
*p = code;
return uprog.len;
}
#endif /* CONFIG_IPPP_FILTER */
/*
* ippp device ioctl
*/
int
isdn_ppp_ioctl(int min, struct file *file, unsigned int cmd, unsigned long arg)
{
unsigned long val;
int r, i, j;
struct ippp_struct *is;
isdn_net_local *lp;
struct isdn_ppp_comp_data data;
void __user *argp = (void __user *)arg;
is = file->private_data;
lp = is->lp;
if (is->debug & 0x1)
printk(KERN_DEBUG "isdn_ppp_ioctl: minor: %d cmd: %x state: %x\n", min, cmd, is->state);
if (!(is->state & IPPP_OPEN))
return -EINVAL;
switch (cmd) {
case PPPIOCBUNDLE:
#ifdef CONFIG_ISDN_MPP
if (!(is->state & IPPP_CONNECT))
return -EINVAL;
if ((r = get_arg(argp, &val, sizeof(val))))
return r;
printk(KERN_DEBUG "iPPP-bundle: minor: %d, slave unit: %d, master unit: %d\n",
(int) min, (int) is->unit, (int) val);
return isdn_ppp_bundle(is, val);
#else
return -1;
#endif
break;
case PPPIOCGUNIT: /* get ppp/isdn unit number */
if ((r = set_arg(argp, &is->unit, sizeof(is->unit))))
return r;
break;
case PPPIOCGIFNAME:
if (!lp)
return -EINVAL;
if ((r = set_arg(argp, lp->netdev->dev->name,
strlen(lp->netdev->dev->name))))
return r;
break;
case PPPIOCGMPFLAGS: /* get configuration flags */
if ((r = set_arg(argp, &is->mpppcfg, sizeof(is->mpppcfg))))
return r;
break;
case PPPIOCSMPFLAGS: /* set configuration flags */
if ((r = get_arg(argp, &val, sizeof(val))))
return r;
is->mpppcfg = val;
break;
case PPPIOCGFLAGS: /* get configuration flags */
if ((r = set_arg(argp, &is->pppcfg, sizeof(is->pppcfg))))
return r;
break;
case PPPIOCSFLAGS: /* set configuration flags */
if ((r = get_arg(argp, &val, sizeof(val)))) {
return r;
}
if (val & SC_ENABLE_IP && !(is->pppcfg & SC_ENABLE_IP) && (is->state & IPPP_CONNECT)) {
if (lp) {
/* OK .. we are ready to send buffers */
is->pppcfg = val; /* isdn_ppp_xmit test for SC_ENABLE_IP !!! */
netif_wake_queue(lp->netdev->dev);
break;
}
}
is->pppcfg = val;
break;
case PPPIOCGIDLE: /* get idle time information */
if (lp) {
struct ppp_idle pidle;
pidle.xmit_idle = pidle.recv_idle = lp->huptimer;
if ((r = set_arg(argp, &pidle, sizeof(struct ppp_idle))))
return r;
}
break;
case PPPIOCSMRU: /* set receive unit size for PPP */
if ((r = get_arg(argp, &val, sizeof(val))))
return r;
is->mru = val;
break;
case PPPIOCSMPMRU:
break;
case PPPIOCSMPMTU:
break;
case PPPIOCSMAXCID: /* set the maximum compression slot id */
if ((r = get_arg(argp, &val, sizeof(val))))
return r;
val++;
if (is->maxcid != val) {
#ifdef CONFIG_ISDN_PPP_VJ
struct slcompress *sltmp;
#endif
if (is->debug & 0x1)
printk(KERN_DEBUG "ippp, ioctl: changed MAXCID to %ld\n", val);
is->maxcid = val;
#ifdef CONFIG_ISDN_PPP_VJ
sltmp = slhc_init(16, val);
if (IS_ERR(sltmp))
return PTR_ERR(sltmp);
if (is->slcomp)
slhc_free(is->slcomp);
is->slcomp = sltmp;
#endif
}
break;
case PPPIOCGDEBUG:
if ((r = set_arg(argp, &is->debug, sizeof(is->debug))))
return r;
break;
case PPPIOCSDEBUG:
if ((r = get_arg(argp, &val, sizeof(val))))
return r;
is->debug = val;
break;
case PPPIOCGCOMPRESSORS:
{
unsigned long protos[8] = {0,};
struct isdn_ppp_compressor *ipc = ipc_head;
while (ipc) {
j = ipc->num / (sizeof(long) * 8);
i = ipc->num % (sizeof(long) * 8);
if (j < 8)
protos[j] |= (1UL << i);
ipc = ipc->next;
}
if ((r = set_arg(argp, protos, 8 * sizeof(long))))
return r;
}
break;
case PPPIOCSCOMPRESSOR:
if ((r = get_arg(argp, &data, sizeof(struct isdn_ppp_comp_data))))
return r;
return isdn_ppp_set_compressor(is, &data);
case PPPIOCGCALLINFO:
{
struct pppcallinfo pci;
memset((char *)&pci, 0, sizeof(struct pppcallinfo));
if (lp)
{
strncpy(pci.local_num, lp->msn, 63);
if (lp->dial) {
strncpy(pci.remote_num, lp->dial->num, 63);
}
pci.charge_units = lp->charge;
if (lp->outgoing)
pci.calltype = CALLTYPE_OUTGOING;
else
pci.calltype = CALLTYPE_INCOMING;
if (lp->flags & ISDN_NET_CALLBACK)
pci.calltype |= CALLTYPE_CALLBACK;
}
return set_arg(argp, &pci, sizeof(struct pppcallinfo));
}
#ifdef CONFIG_IPPP_FILTER
case PPPIOCSPASS:
{
struct sock_fprog_kern fprog;
struct sock_filter *code;
int err, len = get_filter(argp, &code);
if (len < 0)
return len;
fprog.len = len;
fprog.filter = code;
if (is->pass_filter) {
bpf_prog_destroy(is->pass_filter);
is->pass_filter = NULL;
}
if (fprog.filter != NULL)
err = bpf_prog_create(&is->pass_filter, &fprog);
else
err = 0;
kfree(code);
return err;
}
case PPPIOCSACTIVE:
{
struct sock_fprog_kern fprog;
struct sock_filter *code;
int err, len = get_filter(argp, &code);
if (len < 0)
return len;
fprog.len = len;
fprog.filter = code;
if (is->active_filter) {
bpf_prog_destroy(is->active_filter);
is->active_filter = NULL;
}
if (fprog.filter != NULL)
err = bpf_prog_create(&is->active_filter, &fprog);
else
err = 0;
kfree(code);
return err;
}
#endif /* CONFIG_IPPP_FILTER */
default:
break;
}
return 0;
}
unsigned int
isdn_ppp_poll(struct file *file, poll_table *wait)
{
u_int mask;
struct ippp_buf_queue *bf, *bl;
u_long flags;
struct ippp_struct *is;
is = file->private_data;
if (is->debug & 0x2)
printk(KERN_DEBUG "isdn_ppp_poll: minor: %d\n",
iminor(file_inode(file)));
/* just registers wait_queue hook. This doesn't really wait. */
poll_wait(file, &is->wq, wait);
if (!(is->state & IPPP_OPEN)) {
if (is->state == IPPP_CLOSEWAIT)
return POLLHUP;
printk(KERN_DEBUG "isdn_ppp: device not open\n");
return POLLERR;
}
/* we're always ready to send .. */
mask = POLLOUT | POLLWRNORM;
spin_lock_irqsave(&is->buflock, flags);
bl = is->last;
bf = is->first;
/*
* if IPPP_NOBLOCK is set we return even if we have nothing to read
*/
if (bf->next != bl || (is->state & IPPP_NOBLOCK)) {
is->state &= ~IPPP_NOBLOCK;
mask |= POLLIN | POLLRDNORM;
}
spin_unlock_irqrestore(&is->buflock, flags);
return mask;
}
/*
* fill up isdn_ppp_read() queue ..
*/
static int
isdn_ppp_fill_rq(unsigned char *buf, int len, int proto, int slot)
{
struct ippp_buf_queue *bf, *bl;
u_long flags;
u_char *nbuf;
struct ippp_struct *is;
if (slot < 0 || slot >= ISDN_MAX_CHANNELS) {
printk(KERN_WARNING "ippp: illegal slot(%d).\n", slot);
return 0;
}
is = ippp_table[slot];
if (!(is->state & IPPP_CONNECT)) {
printk(KERN_DEBUG "ippp: device not activated.\n");
return 0;
}
nbuf = kmalloc(len + 4, GFP_ATOMIC);
if (!nbuf) {
printk(KERN_WARNING "ippp: Can't alloc buf\n");
return 0;
}
nbuf[0] = PPP_ALLSTATIONS;
nbuf[1] = PPP_UI;
nbuf[2] = proto >> 8;
nbuf[3] = proto & 0xff;
memcpy(nbuf + 4, buf, len);
spin_lock_irqsave(&is->buflock, flags);
bf = is->first;
bl = is->last;
if (bf == bl) {
printk(KERN_WARNING "ippp: Queue is full; discarding first buffer\n");
bf = bf->next;
kfree(bf->buf);
is->first = bf;
}
bl->buf = (char *) nbuf;
bl->len = len + 4;
is->last = bl->next;
spin_unlock_irqrestore(&is->buflock, flags);
wake_up_interruptible(&is->wq);
return len;
}
/*
* read() .. non-blocking: ipppd calls it only after select()
* reports, that there is data
*/
int
isdn_ppp_read(int min, struct file *file, char __user *buf, int count)
{
struct ippp_struct *is;
struct ippp_buf_queue *b;
u_long flags;
u_char *save_buf;
is = file->private_data;
if (!(is->state & IPPP_OPEN))
return 0;
if (!access_ok(VERIFY_WRITE, buf, count))
return -EFAULT;
spin_lock_irqsave(&is->buflock, flags);
b = is->first->next;
save_buf = b->buf;
if (!save_buf) {
spin_unlock_irqrestore(&is->buflock, flags);
return -EAGAIN;
}
if (b->len < count)
count = b->len;
b->buf = NULL;
is->first = b;
spin_unlock_irqrestore(&is->buflock, flags);
if (copy_to_user(buf, save_buf, count))
count = -EFAULT;
kfree(save_buf);
return count;
}
/*
* ipppd wanna write a packet to the card .. non-blocking
*/
int
isdn_ppp_write(int min, struct file *file, const char __user *buf, int count)
{
isdn_net_local *lp;
struct ippp_struct *is;
int proto;
unsigned char protobuf[4];
is = file->private_data;
if (!(is->state & IPPP_CONNECT))
return 0;
lp = is->lp;
/* -> push it directly to the lowlevel interface */
if (!lp)
printk(KERN_DEBUG "isdn_ppp_write: lp == NULL\n");
else {
/*
* Don't reset huptimer for
* LCP packets. (Echo requests).
*/
if (copy_from_user(protobuf, buf, 4))
return -EFAULT;
proto = PPP_PROTOCOL(protobuf);
if (proto != PPP_LCP)
lp->huptimer = 0;
if (lp->isdn_device < 0 || lp->isdn_channel < 0)
return 0;
if ((dev->drv[lp->isdn_device]->flags & DRV_FLAG_RUNNING) &&
lp->dialstate == 0 &&
(lp->flags & ISDN_NET_CONNECTED)) {
unsigned short hl;
struct sk_buff *skb;
/*
* we need to reserve enough space in front of
* sk_buff. old call to dev_alloc_skb only reserved
* 16 bytes, now we are looking what the driver want
*/
hl = dev->drv[lp->isdn_device]->interface->hl_hdrlen;
skb = alloc_skb(hl + count, GFP_ATOMIC);
if (!skb) {
printk(KERN_WARNING "isdn_ppp_write: out of memory!\n");
return count;
}
skb_reserve(skb, hl);
if (copy_from_user(skb_put(skb, count), buf, count))
{
kfree_skb(skb);
return -EFAULT;
}
if (is->debug & 0x40) {
printk(KERN_DEBUG "ppp xmit: len %d\n", (int) skb->len);
isdn_ppp_frame_log("xmit", skb->data, skb->len, 32, is->unit, lp->ppp_slot);
}
isdn_ppp_send_ccp(lp->netdev, lp, skb); /* keeps CCP/compression states in sync */
isdn_net_write_super(lp, skb);
}
}
return count;
}
/*
* init memory, structures etc.
*/
int
isdn_ppp_init(void)
{
int i,
j;
#ifdef CONFIG_ISDN_MPP
if (isdn_ppp_mp_bundle_array_init() < 0)
return -ENOMEM;
#endif /* CONFIG_ISDN_MPP */
for (i = 0; i < ISDN_MAX_CHANNELS; i++) {
if (!(ippp_table[i] = kzalloc(sizeof(struct ippp_struct), GFP_KERNEL))) {
printk(KERN_WARNING "isdn_ppp_init: Could not alloc ippp_table\n");
for (j = 0; j < i; j++)
kfree(ippp_table[j]);
return -1;
}
spin_lock_init(&ippp_table[i]->buflock);
ippp_table[i]->state = 0;
ippp_table[i]->first = ippp_table[i]->rq + NUM_RCV_BUFFS - 1;
ippp_table[i]->last = ippp_table[i]->rq;
for (j = 0; j < NUM_RCV_BUFFS; j++) {
ippp_table[i]->rq[j].buf = NULL;
ippp_table[i]->rq[j].last = ippp_table[i]->rq +
(NUM_RCV_BUFFS + j - 1) % NUM_RCV_BUFFS;
ippp_table[i]->rq[j].next = ippp_table[i]->rq + (j + 1) % NUM_RCV_BUFFS;
}
}
return 0;
}
void
isdn_ppp_cleanup(void)
{
int i;
for (i = 0; i < ISDN_MAX_CHANNELS; i++)
kfree(ippp_table[i]);
#ifdef CONFIG_ISDN_MPP
kfree(isdn_ppp_bundle_arr);
#endif /* CONFIG_ISDN_MPP */
}
/*
* check for address/control field and skip if allowed
* retval != 0 -> discard packet silently
*/
static int isdn_ppp_skip_ac(struct ippp_struct *is, struct sk_buff *skb)
{
if (skb->len < 1)
return -1;
if (skb->data[0] == 0xff) {
if (skb->len < 2)
return -1;
if (skb->data[1] != 0x03)
return -1;
// skip address/control (AC) field
skb_pull(skb, 2);
} else {
if (is->pppcfg & SC_REJ_COMP_AC)
// if AC compression was not negotiated, but used, discard packet
return -1;
}
return 0;
}
/*
* get the PPP protocol header and pull skb
* retval < 0 -> discard packet silently
*/
static int isdn_ppp_strip_proto(struct sk_buff *skb)
{
int proto;
if (skb->len < 1)
return -1;
if (skb->data[0] & 0x1) {
// protocol field is compressed
proto = skb->data[0];
skb_pull(skb, 1);
} else {
if (skb->len < 2)
return -1;
proto = ((int) skb->data[0] << 8) + skb->data[1];
skb_pull(skb, 2);
}
return proto;
}
/*
* handler for incoming packets on a syncPPP interface
*/
void isdn_ppp_receive(isdn_net_dev *net_dev, isdn_net_local *lp, struct sk_buff *skb)
{
struct ippp_struct *is;