* Dynamic PPP devices by Jim Freeman <jfree@caldera.com>.
* ppp_tty_receive ``noisy-raise-bug'' fixed by Ove Ewerlid <ewerlid@syscon.uu.se>
*
- * ==FILEVERSION 970227==
+ * ==FILEVERSION 970626==
*
* NOTE TO MAINTAINERS:
* If you modify this file at all, please set the number above to the
#define PPP_MAX_DEV 256
#endif
-/* $Id: ppp.c,v 1.10 1997/03/04 03:29:58 paulus Exp $
+/* $Id: ppp.c,v 1.13 1997/07/14 03:50:50 paulus Exp $
* Added dynamic allocation of channels to eliminate
* compiled-in limits on the number of channels.
*
#include <linux/ioport.h>
#endif
+#if LINUX_VERSION_CODE >= VERSION(2,1,23)
+#include <linux/poll.h>
+#endif
+
#include <linux/in.h>
#include <linux/malloc.h>
#include <linux/tty.h>
#define COPY_TO_USER(error,dest,src,size) \
do { \
- error = verify_area (VERIFY_WRITE, (void *) src, size); \
+ error = verify_area (VERIFY_WRITE, (void *) dest, size); \
if (error == 0) \
memcpy_tofs (dest, src, size); \
} while (0)
#endif
+#if LINUX_VERSION_CODE < VERSION(2,1,37)
+#define test_and_set_bit(nr, addr) set_bit(nr, addr)
+#endif
+
static int ppp_register_compressor (struct compressor *cp);
static void ppp_unregister_compressor (struct compressor *cp);
static struct compressor *find_compressor (int type);
static void ppp_init_ctrl_blk (register struct ppp *);
static void ppp_kick_tty (struct ppp *, struct ppp_buffer *bfr);
-static int ppp_doframe (struct ppp *);
static struct ppp *ppp_alloc (void);
static struct ppp *ppp_find (int pid_value);
static void ppp_print_buffer (const __u8 *, const __u8 *, int);
register struct ppp_buffer *buf,
register __u8 chr);
extern inline int lock_buffer (register struct ppp_buffer *buf);
+static int ppp_dev_xmit_ip (struct ppp *ppp, struct ppp_buffer *buf,
+ __u8 *data, int len);
static int rcv_proto_ip (struct ppp *, __u16, __u8 *, int);
static int rcv_proto_ipx (struct ppp *, __u16, __u8 *, int);
static int flag_time = OPTIMIZE_FLAG_TIME;
static int max_dev = PPP_MAX_DEV;
+#if LINUX_VERSION_CODE >= VERSION(2,1,19)
+MODULE_PARM(flag_time, "i");
+MODULE_PARM(max_dev, "i");
+#endif
+
/*
* The "main" procedure to the ppp device
*/
unsigned int);
static int ppp_tty_ioctl (struct tty_struct *, struct file *, unsigned int,
unsigned long);
+#if LINUX_VERSION_CODE < VERSION(2,1,23)
static int ppp_tty_select (struct tty_struct *tty, struct inode *inode,
struct file *filp, int sel_type, select_table * wait);
+#else
+static unsigned int ppp_tty_poll (struct tty_struct *tty, struct file *filp, poll_table * wait);
+#endif
static int ppp_tty_open (struct tty_struct *);
static void ppp_tty_close (struct tty_struct *);
static int ppp_tty_room (struct tty_struct *tty);
char *fp, int count);
static void ppp_tty_wakeup (struct tty_struct *tty);
-#define CHECK_PPP(a) if (!ppp->inuse) { printk (ppp_warning, __LINE__); return a;}
-#define CHECK_PPP_VOID() if (!ppp->inuse) { printk (ppp_warning, __LINE__); return;}
+#define CHECK_PPP_MAGIC(ppp) do { \
+ if (ppp->magic != PPP_MAGIC) { \
+ printk(KERN_WARNING "bad magic for ppp %p at %s:%d\n", \
+ ppp, __FILE__, __LINE__); \
+ } \
+} while (0)
+#define CHECK_PPP(a) do { \
+ CHECK_PPP_MAGIC(ppp); \
+ if (!ppp->inuse) { \
+ printk (ppp_warning, __LINE__); \
+ return a; \
+ } \
+} while (0)
+#define CHECK_PPP_VOID() do { \
+ CHECK_PPP_MAGIC(ppp); \
+ if (!ppp->inuse) { \
+ printk (ppp_warning, __LINE__); \
+ } \
+} while (0)
#define in_xmap(ppp,c) (ppp->xmit_async_map[(c) >> 5] & (1 << ((c) & 0x1f)))
#define in_rmap(ppp,c) ((((unsigned int) (__u8) (c)) < 0x20) && \
#define bset(p,b) ((p)[(b) >> 5] |= (1 << ((b) & 0x1f)))
-#define tty2ppp(tty) ((struct ppp *) (tty->disc_data))
-#define dev2ppp(dev) ((struct ppp *) (dev->priv))
-#define ppp2tty(ppp) ((struct tty_struct *) ppp->tty)
-#define ppp2dev(ppp) ((struct device *) ppp->dev)
-
-struct ppp_hdr {
- __u8 address;
- __u8 control;
- __u8 protocol[2];
-};
-
-#define PPP_HARD_HDR_LEN (sizeof (struct ppp_hdr))
-
-typedef struct ppp_ctrl {
- struct ppp_ctrl *next; /* Next structure in the list */
- char name [8]; /* Name of the device */
- struct ppp ppp; /* PPP control table */
- struct device dev; /* Device information table */
-} ppp_ctrl_t;
-
-static ppp_ctrl_t *ppp_list = NULL;
+#define tty2ppp(tty) ((struct ppp *) ((tty)->disc_data))
+#define dev2ppp(dev) ((struct ppp *) ((dev)->priv))
+#define ppp2tty(ppp) ((ppp)->tty)
+#define ppp2dev(ppp) (&(ppp)->dev)
-#define ctl2ppp(ctl) (struct ppp *) &ctl->ppp
-#define ctl2dev(ctl) (struct device *) &ctl->dev
-#undef PPP_NRUNIT
+static struct ppp *ppp_list = NULL;
+static struct ppp *ppp_last = NULL;
/* Buffer types */
#define BUFFER_TYPE_DEV_RD 0 /* ppp read buffer */
"University of California\n");
#endif
- printk (KERN_INFO
- "PPP Dynamic channel allocation code copyright 1995 "
- "Caldera, Inc.\n");
/*
* Register the tty discipline
*/
ppp_ldisc.read = ppp_tty_read;
ppp_ldisc.write = ppp_tty_write;
ppp_ldisc.ioctl = ppp_tty_ioctl;
+#if LINUX_VERSION_CODE < VERSION(2,1,23)
ppp_ldisc.select = ppp_tty_select;
+#else
+ ppp_ldisc.poll = ppp_tty_poll;
+#endif
ppp_ldisc.receive_room = ppp_tty_room;
ppp_ldisc.receive_buf = ppp_tty_receive;
ppp_ldisc.write_wakeup = ppp_tty_wakeup;
static int
ppp_init_dev (struct device *dev)
{
- int indx;
-
#if LINUX_VERSION_CODE < VERSION(2,1,15)
dev->hard_header = ppp_dev_header;
dev->rebuild_header = ppp_dev_rebuild;
dev->tx_queue_len = 10;
dev->type = ARPHRD_PPP;
- for (indx = 0; indx < DEV_NUMBUFFS; indx++)
- skb_queue_head_init (&dev->buffs[indx]);
+#if LINUX_VERSION_CODE < VERSION(2,1,20)
+ {
+ int indx;
+
+ for (indx = 0; indx < DEV_NUMBUFFS; indx++)
+ skb_queue_head_init (&dev->buffs[indx]);
+ }
+#else
+ dev_init_buffers(dev);
+#endif
/* New-style flags */
- dev->flags = IFF_POINTOPOINT;
+ dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
dev->family = AF_INET;
dev->pa_addr = 0;
dev->pa_brdaddr = 0;
}
#endif
+#define BUFFER_MAGIC 0x1d10
+#define CHECK_BUF_MAGIC(buf) do { \
+ if (buf->magic != BUFFER_MAGIC) { \
+ printk(KERN_WARNING "bad magic for ppp buffer %p at %s:%d\n", \
+ buf, __FILE__, __LINE__); \
+ } \
+} while (0)
+
/*
* Routine to allocate a buffer for later use by the driver.
*/
buf->head = 0;
buf->tail = 0;
buf->fcs = PPP_INITFCS;
-
+ buf->magic = BUFFER_MAGIC;
}
return (buf);
}
static void
ppp_free_buf (struct ppp_buffer *ptr)
{
- if (ptr != NULL)
+ if (ptr != NULL) {
+ CHECK_BUF_MAGIC(ptr);
kfree (ptr);
+ }
}
/*
/*
* Save the current state and if free then set it to the "busy" state
*/
+ CHECK_BUF_MAGIC(buf);
save_flags (flags);
cli ();
state = buf->locked;
ppp_changedmtu (struct ppp *ppp, int new_mtu, int new_mru)
{
struct device *dev;
+ unsigned long flags;
struct ppp_buffer *new_rbuf;
struct ppp_buffer *new_wbuf;
/*
* Allocate the buffer from the kernel for the data
*/
+ CHECK_PPP(0);
dev = ppp2dev (ppp);
+ if (ppp->flags & SC_DEBUG)
+ printk(KERN_DEBUG "%s: changedmtu %d %d\n", ppp->name,
+ new_mtu, new_mru);
mru = new_mru;
/* allow for possible escaping of every character */
mtu = (new_mtu * 2) + 20;
mru += 10;
- new_wbuf = ppp_alloc_buf (mtu+PPP_HARD_HDR_LEN, BUFFER_TYPE_DEV_WR);
+ new_wbuf = ppp_alloc_buf (mtu+PPP_HDRLEN, BUFFER_TYPE_DEV_WR);
new_tbuf = ppp_alloc_buf ((PPP_MTU * 2) + 24, BUFFER_TYPE_TTY_WR);
new_rbuf = ppp_alloc_buf (mru + 84, BUFFER_TYPE_DEV_RD);
- new_cbuf = ppp_alloc_buf (mru+PPP_HARD_HDR_LEN, BUFFER_TYPE_VJ);
+ new_cbuf = ppp_alloc_buf (mru+PPP_HDRLEN, BUFFER_TYPE_VJ);
/*
* If the buffers failed to allocate then complain and release the partial
* allocations.
/*
* Update the pointers to the new buffer structures.
*/
+ save_flags(flags);
cli ();
old_wbuf = ppp->wbuf;
old_rbuf = ppp->rbuf;
ppp->cbuf = new_cbuf;
ppp->tbuf = new_tbuf;
+ if (old_wbuf)
+ new_wbuf->locked = old_wbuf->locked;
+
ppp->rbuf->size -= 80; /* reserve space for vj header expansion */
dev->mem_start = (unsigned long) buf_base (new_wbuf);
ppp->tty->flags &= ~(1 << TTY_DO_WRITE_WAKEUP);
ppp->flags &= ~SC_XMIT_BUSY;
- sti ();
+ restore_flags(flags);
/*
* Release old buffer pointers
*/
static void
ppp_ccp_closed (struct ppp *ppp)
{
+ unsigned long flags;
+
+ save_flags(flags);
+ cli();
+ ppp->flags &= ~(SC_CCP_OPEN | SC_CCP_UP | SC_COMP_RUN | SC_DECOMP_RUN);
+ restore_flags(flags);
+ if (ppp->flags & SC_DEBUG)
+ printk(KERN_DEBUG "%s: ccp closed\n", ppp->name);
if (ppp->sc_xc_state) {
(*ppp->sc_xcomp->comp_free) (ppp->sc_xc_state);
ppp->sc_xc_state = NULL;
struct tty_struct *tty;
struct device *dev;
+ CHECK_PPP_MAGIC(ppp);
tty = ppp2tty (ppp);
dev = ppp2dev (ppp);
+ if (ppp->flags & SC_DEBUG)
+ printk(KERN_DEBUG "ppp%s released\n", ppp->name);
+
ppp_ccp_closed (ppp);
- /* Ensure that the pppd process is not hanging on select() */
+ /* Ensure that the pppd process is not hanging on select()/poll() */
wake_up_interruptible (&ppp->read_wait);
wake_up_interruptible (&ppp->write_wait);
tty->disc_data = NULL; /* Break the tty->ppp link */
if (dev && dev->flags & IFF_UP) {
+ dev->flags &= ~IFF_UP; /* prevent recursion */
dev_close (dev); /* close the device properly */
- dev->flags = 0; /* prevent recursion */
}
ppp_free_buf (ppp->rbuf);
* If we are taking over a ppp unit which is currently
* connected to a loopback pty, there's not much to do.
*/
- ppp->tty = tty;
+ CHECK_PPP(-EINVAL);
tty->disc_data = ppp;
+ ppp->tty = tty;
} else {
ppp = ppp_alloc();
* Initialize the control block
*/
ppp_init_ctrl_blk (ppp);
- ppp->tty = tty;
tty->disc_data = ppp;
+ ppp->tty = tty;
/*
* Allocate space for the default VJ header compression slots
*/
struct ppp_buffer *xbuf)
{
register int count, actual;
+ unsigned long flags;
+
+ CHECK_PPP_VOID();
+ CHECK_BUF_MAGIC(xbuf);
/*
* Prevent re-entrancy by ensuring that this routine is called only once.
*/
+ save_flags(flags);
cli ();
if (ppp->flags & SC_XMIT_BUSY) {
- sti ();
+ restore_flags(flags);
return;
}
ppp->flags |= SC_XMIT_BUSY;
- sti ();
+ restore_flags(flags);
/*
* Send the next block of data to the modem
*/
* If the completed buffer came from the device write, then complete the
* transmission block.
*/
+ ppp2dev (ppp)->tbusy = 0;
if (ppp2dev (ppp) -> flags & IFF_UP) {
- if (xbuf->type == BUFFER_TYPE_DEV_WR)
- ppp2dev (ppp)->tbusy = 0;
mark_bh (NET_BH);
}
/*
/*
* Look at the priorities. Choose a daemon write over the device driver.
*/
+ save_flags(flags);
cli();
xbuf = ppp->s1buf;
ppp->s1buf = NULL;
xbuf = ppp->s2buf;
ppp->s2buf = NULL;
}
- sti();
/*
* If there is a pending buffer then transmit it now.
*/
if (xbuf != NULL) {
ppp->flags &= ~SC_XMIT_BUSY;
ppp_kick_tty (ppp, xbuf);
+ restore_flags(flags);
return;
}
+ restore_flags(flags);
}
}
/*
* Clear the re-entry flag
*/
+ save_flags(flags); /* &=~ may not be atomic */
+ cli ();
ppp->flags &= ~SC_XMIT_BUSY;
+ restore_flags(flags);
}
/*
if (!ppp)
return;
-
- if (ppp->magic != PPP_MAGIC)
- return;
+ CHECK_PPP_VOID();
if (tty != ppp->tty) {
tty->flags &= ~(1 << TTY_DO_WRITE_WAKEUP);
ppp_kick_tty (struct ppp *ppp, struct ppp_buffer *xbuf)
{
unsigned long flags;
+
+ CHECK_PPP_VOID();
+ CHECK_BUF_MAGIC(xbuf);
/*
* Hold interrupts.
*/
register struct ppp_buffer *buf = NULL;
__u8 chr;
+ if (ppp != 0)
+ CHECK_PPP_VOID();
/*
* This can happen if stuff comes in on the backup tty.
*/
- if (tty != ppp->tty)
+ if (ppp == 0 || tty != ppp->tty)
return;
/*
* Fetch the pointer to the buffer. Be careful about race conditions.
*/
- if (ppp != NULL)
- buf = ppp->rbuf;
-
+ buf = ppp->rbuf;
if (buf == NULL)
return;
/*
if (ppp->magic != PPP_MAGIC) {
if (ppp->flags & SC_DEBUG)
printk (KERN_DEBUG
- "PPP: handler called but couldn't find "
+ "PPP: tty_receive called but couldn't find "
"PPP struct.\n");
return;
}
* 0x5d, if it follows an escape :-)
*/
if (ppp->escape) {
- chr ^= ppp->escape;
+ chr ^= PPP_TRANS;
ppp->escape = 0;
} else if (chr == PPP_ESCAPE) {
ppp->escape = PPP_TRANS;
break;
}
+ /*
+ * Decompress A/C and protocol compression here.
+ */
+ if (buf->count == 0 && chr != PPP_ALLSTATIONS) {
+ buf_base(buf)[0] = PPP_ALLSTATIONS;
+ buf_base(buf)[1] = PPP_UI;
+ buf->count = 2;
+ }
+ if (buf->count == 2 && (chr & 1) != 0) {
+ buf_base(buf)[2] = 0;
+ buf->count = 3;
+ }
/*
* If the count sent is within reason then store the character, bump the
* count, and update the FCS for the character.
}
}
+/* on entry, a received frame is in ppp->rbuf.bufr
+ check it and dispose as appropriate */
+
+static int
+ppp_doframe (struct ppp *ppp)
+{
+ __u8 *data = buf_base (ppp->rbuf);
+ int count = ppp->rbuf->count;
+ int proto;
+ int new_count;
+ __u8 *new_data;
+
+ CHECK_PPP(0);
+ CHECK_BUF_MAGIC(ppp->rbuf);
+/*
+ * If there is a pending error from the receiver then log it and discard
+ * the damaged frame.
+ */
+ if (ppp->toss) {
+ if ((ppp->flags & SC_DEBUG) && count > 0)
+ printk (KERN_DEBUG
+ "ppp_toss: tossing frame, reason = %x\n",
+ ppp->toss);
+ return 0;
+ }
+/*
+ * An empty frame is ignored. This occurs if the FLAG sequence precedes and
+ * follows each frame.
+ */
+ if (count == 0)
+ return 1;
+/*
+ * Generate an error if the frame is too small.
+ */
+ if (count < PPP_HDRLEN + 2) {
+ if (ppp->flags & SC_DEBUG)
+ printk (KERN_DEBUG
+ "ppp: got runt ppp frame, %d chars\n", count);
+ ++ppp->estats.rx_length_errors;
+ return 0;
+ }
+/*
+ * Verify the CRC of the frame and discard the CRC characters from the
+ * end of the buffer.
+ */
+ if (ppp->rbuf->fcs != PPP_GOODFCS) {
+ if (ppp->flags & SC_DEBUG) {
+ printk (KERN_DEBUG
+ "ppp: frame with bad fcs, length = %d\n",
+ count);
+ ppp_print_buffer("bad frame", data, count);
+ }
+ ++ppp->estats.rx_crc_errors;
+ return 0;
+ }
+ count -= 2; /* ignore the fcs characters */
+/*
+ * Obtain the protocol from the frame
+ */
+ proto = PPP_PROTOCOL(data);
+/*
+ * Process the active decompressor.
+ */
+ if ((ppp->sc_rc_state != (void *) 0) &&
+ (ppp->flags & SC_DECOMP_RUN) &&
+ ((ppp->flags & (SC_DC_FERROR | SC_DC_ERROR)) == 0)) {
+ if (proto == PPP_COMP) {
+/*
+ * If the frame is compressed then decompress it.
+ */
+ new_data = kmalloc (ppp->mru + PPP_HDRLEN, GFP_ATOMIC);
+ if (new_data == NULL) {
+ if (ppp->flags & SC_DEBUG)
+ printk (KERN_ERR
+ "ppp_doframe: no memory\n");
+ new_count = DECOMP_ERROR;
+ } else {
+ new_count = (*ppp->sc_rcomp->decompress)
+ (ppp->sc_rc_state, data, count,
+ new_data, ppp->mru + PPP_HDRLEN);
+ }
+ switch (new_count) {
+ default:
+ ppp_doframe_lower (ppp, new_data, new_count);
+ kfree (new_data);
+ return 1;
+
+ case DECOMP_ERROR:
+ ppp->flags |= SC_DC_ERROR;
+ break;
+
+ case DECOMP_FATALERROR:
+ ppp->flags |= SC_DC_FERROR;
+ if (ppp->flags & SC_DEBUG)
+ printk(KERN_ERR "ppp: fatal decomp error\n");
+ break;
+ }
+/*
+ * Log the error condition and discard the frame.
+ */
+ if (new_data != 0)
+ kfree (new_data);
+ slhc_toss (ppp->slcomp);
+ ++ppp->stats.ppp_ierrors;
+ } else {
+/*
+ * The frame is not special. Pass it through the compressor without
+ * actually compressing the data
+ */
+ (*ppp->sc_rcomp->incomp) (ppp->sc_rc_state,
+ data, count);
+ }
+ }
+/*
+ * Process the uncompressed frame.
+ */
+ ppp_doframe_lower (ppp, data, count);
+ return 1;
+}
+
+static void ppp_doframe_lower (struct ppp *ppp, __u8 *data, int count)
+{
+ __u16 proto = PPP_PROTOCOL (data);
+ ppp_proto_type *proto_ptr;
+
+ CHECK_PPP_VOID();
+/*
+ * Ignore empty frames
+ */
+ if (count <= PPP_HDRLEN)
+ return;
+/*
+ * Count the frame and print it
+ */
+ ++ppp->stats.ppp_ipackets;
+ if (ppp->flags & SC_LOG_INPKT)
+ ppp_print_buffer ("receive frame", data, count);
+/*
+ * Find the procedure to handle this protocol. The last one is marked
+ * as a protocol 0 which is the 'catch-all' to feed it to the pppd daemon.
+ */
+ proto_ptr = proto_list;
+ while (proto_ptr->proto != 0 && proto_ptr->proto != proto)
+ ++proto_ptr;
+/*
+ * Update the appropriate statistic counter.
+ */
+ if ((*proto_ptr->func) (ppp, proto,
+ &data[PPP_HDRLEN],
+ count - PPP_HDRLEN))
+ ppp->stats.ppp_ioctects += count;
+ else
+ ++ppp->stats.ppp_discards;
+}
+
/*
* Put the input frame into the networking system for the indicated protocol
*/
static int
rcv_proto_ip (struct ppp *ppp, __u16 proto, __u8 * data, int count)
{
+ CHECK_PPP(0);
if ((ppp2dev (ppp)->flags & IFF_UP) && (count > 0))
if (ppp->sc_npmode[NP_IP] == NPMODE_PASS)
return ppp_rcv_rx (ppp, htons (ETH_P_IP), data, count);
static int
rcv_proto_ipx (struct ppp *ppp, __u16 proto, __u8 * data, int count)
{
+ CHECK_PPP(0);
if (((ppp2dev (ppp)->flags & IFF_UP) != 0) && (count > 0))
return ppp_rcv_rx (ppp, htons (ETH_P_IPX), data, count);
return 0;
rcv_proto_vjc_comp (struct ppp *ppp, __u16 proto,
__u8 *data, int count)
{
+ CHECK_PPP(0);
if ((ppp->flags & SC_REJ_COMP_TCP) == 0) {
int new_count = slhc_uncompress (ppp->slcomp, data, count);
if (new_count >= 0) {
rcv_proto_vjc_uncomp (struct ppp *ppp, __u16 proto,
__u8 *data, int count)
{
+ CHECK_PPP(0);
if ((ppp->flags & SC_REJ_COMP_TCP) == 0) {
if (slhc_remember (ppp->slcomp, data, count) > 0) {
return rcv_proto_ip (ppp, PPP_IP, data, count);
goto failure; \
}
+ CHECK_PPP(0);
/*
* The total length includes the protocol data.
* Lock the user information buffer.
*/
- if (set_bit (0, &ppp->ubuf->locked)) {
+ if (test_and_set_bit (0, &ppp->ubuf->locked)) {
if (ppp->flags & SC_DEBUG)
printk (KERN_DEBUG
- "ppp_us_queue: can't get lock\n");
+ "ppp: rcv_proto_unknown: can't get lock\n");
} else {
+ CHECK_BUF_MAGIC(ppp->ubuf);
current_idx = ppp->ubuf->head;
/*
* Insert the buffer length (not counted), the protocol, and the data
clear_bit (0, &ppp->ubuf->locked);
if (ppp->flags & SC_DEBUG)
printk (KERN_DEBUG
- "ppp_us_queue: ran out of buffer space.\n");
+ "ppp: rcv_proto_unknown: buffer overflow\n");
}
/*
* Discard the frame. There are no takers for this protocol.
*/
if (ppp->flags & SC_DEBUG)
printk (KERN_DEBUG
- "ppp: dropping packet on the floor.\n");
- slhc_toss (ppp->slcomp);
+ "ppp: rcv_proto_unknown: dropping packet\n");
return 0;
}
int slen = CCP_LENGTH(dp);
__u8 *opt = dp + CCP_HDRLEN;
int opt_len = slen - CCP_HDRLEN;
+ unsigned long flags;
if (slen > len)
return;
+ save_flags(flags);
switch (CCP_CODE(dp)) {
case CCP_CONFREQ:
case CCP_TERMREQ:
* CCP must be going down - disable compression
*/
if (ppp->flags & SC_CCP_UP) {
+ cli();
ppp->flags &= ~(SC_CCP_UP |
SC_COMP_RUN |
SC_DECOMP_RUN);
opt_len,
ppp2dev (ppp)->base_addr,
0,
- ppp->flags & SC_DEBUG))
+ ppp->flags & SC_DEBUG)) {
+ if (ppp->flags & SC_DEBUG)
+ printk(KERN_DEBUG "%s: comp running\n",
+ ppp->name);
+ cli();
ppp->flags |= SC_COMP_RUN;
+ }
break;
}
/*
0,
ppp->mru,
ppp->flags & SC_DEBUG)) {
+ if (ppp->flags & SC_DEBUG)
+ printk(KERN_DEBUG "%s: decomp running\n",
+ ppp->name);
+ cli();
ppp->flags |= SC_DECOMP_RUN;
ppp->flags &= ~(SC_DC_ERROR | SC_DC_FERROR);
}
break;
/*
- * The protocol sequence is complete at this end
+ * CCP Reset-ack resets compressors and decompressors as it passes through.
*/
case CCP_RESETACK:
if ((ppp->flags & SC_CCP_UP) == 0)
break;
if (!rcvd) {
- if (ppp->sc_xc_state && (ppp->flags & SC_COMP_RUN))
+ if (ppp->sc_xc_state && (ppp->flags & SC_COMP_RUN)) {
(*ppp->sc_xcomp->comp_reset)(ppp->sc_xc_state);
+ if (ppp->flags & SC_DEBUG)
+ printk(KERN_DEBUG "%s: comp reset\n",
+ ppp->name);
+ }
} else {
if (ppp->sc_rc_state && (ppp->flags & SC_DECOMP_RUN)) {
(*ppp->sc_rcomp->decomp_reset)(ppp->sc_rc_state);
- ppp->flags &= ~SC_DC_ERROR;
+ if (ppp->flags & SC_DEBUG)
+ printk(KERN_DEBUG "%s: decomp reset\n",
+ ppp->name);
+ cli();
+ ppp->flags &= ~SC_DC_ERROR;
}
}
break;
}
+ restore_flags(flags);
}
static int
rcv_proto_ccp (struct ppp *ppp, __u16 proto, __u8 *dp, int len)
{
+ CHECK_PPP(0);
ppp_proto_ccp (ppp, dp, len, 1);
return rcv_proto_unknown (ppp, proto, dp, len);
}
return rcv_proto_unknown (ppp, proto, data, len);
}
-static void ppp_doframe_lower (struct ppp *ppp, __u8 *data, int count)
+/*************************************************************
+ * LINE DISCIPLINE SUPPORT
+ * The following functions form support user programs
+ * which read and write data on a TTY with the PPP line
+ * discipline. Reading is done from a circular queue,
+ * filled by the lower TTY levels.
+ *************************************************************/
+
+/* read a PPP frame from the us_rbuff circular buffer,
+ waiting if necessary
+*/
+
+static int
+ppp_tty_read (struct tty_struct *tty, struct file *file, __u8 * buf,
+ unsigned int nr)
{
- __u16 proto = PPP_PROTOCOL (data);
- ppp_proto_type *proto_ptr;
-/*
- * Ignore empty frames
- */
- if (count <= PPP_HDRLEN)
- return;
+ struct ppp *ppp = tty2ppp (tty);
+ __u8 c;
+ int len, ret;
+ int error;
+
+#define GETC(c) \
+{ \
+ c = buf_base (ppp->ubuf) [ppp->ubuf->tail++]; \
+ ppp->ubuf->tail &= ppp->ubuf->size; \
+}
+
/*
- * Count the frame and print it
- */
- ++ppp->stats.ppp_ipackets;
- if (ppp->flags & SC_LOG_INPKT)
- ppp_print_buffer ("receive frame", data, count);
-/*
- * Find the procedure to handle this protocol. The last one is marked
- * as a protocol 0 which is the 'catch-all' to feed it to the pppd daemon.
- */
- proto_ptr = proto_list;
- while (proto_ptr->proto != 0 && proto_ptr->proto != proto)
- ++proto_ptr;
-/*
- * Update the appropriate statistic counter.
- */
- if ((*proto_ptr->func) (ppp, proto,
- &data[PPP_HARD_HDR_LEN],
- count - PPP_HARD_HDR_LEN))
- ppp->stats.ppp_ioctects += count;
- else
- ++ppp->stats.ppp_discards;
-}
-
-/* on entry, a received frame is in ppp->rbuf.bufr
- check it and dispose as appropriate */
-
-static int
-ppp_doframe (struct ppp *ppp)
-{
- __u8 *data = buf_base (ppp->rbuf);
- int count = ppp->rbuf->count;
- int addr, ctrl, proto;
- int new_count;
- __u8 *new_data;
-/*
- * If there is a pending error from the receiver then log it and discard
- * the damaged frame.
- */
- if (ppp->toss) {
- if ((ppp->flags & SC_DEBUG) && count > 0)
- printk (KERN_DEBUG
- "ppp_toss: tossing frame, reason = %x\n",
- ppp->toss);
- return 0;
- }
-/*
- * An empty frame is ignored. This occurs if the FLAG sequence precedes and
- * follows each frame.
- */
- if (count == 0)
- return 1;
-/*
- * Generate an error if the frame is too small.
- */
- if (count < PPP_HARD_HDR_LEN) {
- if (ppp->flags & SC_DEBUG)
- printk (KERN_DEBUG
- "ppp: got runt ppp frame, %d chars\n", count);
- ++ppp->estats.rx_length_errors;
- return 0;
- }
-/*
- * Verify the CRC of the frame and discard the CRC characters from the
- * end of the buffer.
- */
- if (ppp->rbuf->fcs != PPP_GOODFCS) {
- if (ppp->flags & SC_DEBUG) {
- printk (KERN_DEBUG
- "ppp: frame with bad fcs, length = %d\n",
- count);
- ppp_print_buffer("bad frame", data, count);
- }
- ++ppp->estats.rx_crc_errors;
- return 0;
- }
- count -= 2; /* ignore the fcs characters */
-/*
- * Ignore the leading ADDRESS and CONTROL fields in the frame.
- */
- addr = PPP_ALLSTATIONS;
- ctrl = PPP_UI;
-
- if ((data[0] == PPP_ALLSTATIONS) && (data[1] == PPP_UI)) {
- data += 2;
- count -= 2;
- }
-/*
- * Obtain the protocol from the frame
- */
- proto = (__u16) *data++;
- if ((proto & 1) == 0) {
- proto = (proto << 8) | (__u16) *data++;
- --count;
- }
-/*
- * Rewrite the header with the full information. This may encroach upon
- * the 'filler' area in the buffer header. This is the purpose for the
- * filler.
- */
- *(--data) = proto;
- *(--data) = proto >> 8;
- *(--data) = ctrl;
- *(--data) = addr;
- count += 3;
-/*
- * Process the active decompressor.
- */
- if ((ppp->sc_rc_state != (void *) 0) &&
- (ppp->flags & SC_DECOMP_RUN) &&
- ((ppp->flags & (SC_DC_FERROR | SC_DC_ERROR)) == 0)) {
- if (proto == PPP_COMP) {
-/*
- * If the frame is compressed then decompress it.
- */
- new_data = kmalloc (ppp->mru + PPP_HDRLEN, GFP_ATOMIC);
- if (new_data == NULL) {
- if (ppp->flags & SC_DEBUG)
- printk (KERN_ERR
- "ppp_doframe: no memory\n");
- new_count = DECOMP_ERROR;
- } else {
- new_count = (*ppp->sc_rcomp->decompress)
- (ppp->sc_rc_state, data, count,
- new_data, ppp->mru + PPP_HDRLEN);
- }
- switch (new_count) {
- default:
- ppp_doframe_lower (ppp, new_data, new_count);
- kfree (new_data);
- return 1;
-
- case DECOMP_ERROR:
- ppp->flags |= SC_DC_ERROR;
- break;
-
- case DECOMP_FATALERROR:
- ppp->flags |= SC_DC_FERROR;
- if (ppp->flags & SC_DEBUG)
- printk(KERN_ERR "ppp: fatal decomp error\n");
- break;
- }
-/*
- * Log the error condition and discard the frame.
- */
- if (new_data != 0)
- kfree (new_data);
- slhc_toss (ppp->slcomp);
- ++ppp->stats.ppp_ierrors;
- } else {
-/*
- * The frame is not special. Pass it through the compressor without
- * actually compressing the data
- */
- (*ppp->sc_rcomp->incomp) (ppp->sc_rc_state,
- data, count);
- }
- }
-/*
- * Process the uncompressed frame.
- */
- ppp_doframe_lower (ppp, data, count);
- return 1;
-}
-
-/*************************************************************
- * LINE DISCIPLINE SUPPORT
- * The following functions form support user programs
- * which read and write data on a TTY with the PPP line
- * discipline. Reading is done from a circular queue,
- * filled by the lower TTY levels.
- *************************************************************/
-
-/* read a PPP frame from the us_rbuff circular buffer,
- waiting if necessary
-*/
-
-static int
-ppp_tty_read (struct tty_struct *tty, struct file *file, __u8 * buf,
- unsigned int nr)
-{
- struct ppp *ppp = tty2ppp (tty);
- __u8 c;
- int len, indx;
- int error;
-
-#define GETC(c) \
-{ \
- c = buf_base (ppp->ubuf) [ppp->ubuf->tail++]; \
- ppp->ubuf->tail &= ppp->ubuf->size; \
-}
-
-/*
- * Validate the pointers
+ * Validate the pointers
*/
if (!ppp)
return -EIO;
return -EIO;
CHECK_PPP (-ENXIO);
+
+/*
+ * Before we attempt to write the frame to the user, ensure that the
+ * user has access to the pages for the total buffer length.
+ */
+ error = verify_area (VERIFY_WRITE, buf, nr);
+ if (error != 0)
+ return (error);
+
/*
* Acquire the read lock.
*/
|| tty != ppp->tty)
return 0;
- if (set_bit (0, &ppp->ubuf->locked) != 0) {
+ if (test_and_set_bit (0, &ppp->ubuf->locked) != 0) {
+#if 0
if (ppp->flags & SC_DEBUG)
printk (KERN_DEBUG
"ppp_tty_read: sleeping(ubuf)\n");
-
+#endif
current->timeout = 0;
current->state = TASK_INTERRUPTIBLE;
schedule ();
return -EINTR;
continue;
}
-/*
- * Before we attempt to write the frame to the user, ensure that the
- * user has access to the pages for the total buffer length.
- */
- indx = verify_area (VERIFY_WRITE, buf, nr);
- if (indx != 0)
- return (indx);
+
/*
* Fetch the length of the buffer from the first two bytes.
*/
len = c << 8;
GETC (c);
len += c;
+ if (len)
+ break;
}
+
/*
* If there is no length then wait for the data to arrive.
*/
- if (len == 0) {
- /* no data */
- clear_bit (0, &ppp->ubuf->locked);
- if (file->f_flags & O_NONBLOCK)
- return -EAGAIN;
- current->timeout = 0;
-
- if (ppp->flags & SC_DEBUG)
- printk (KERN_DEBUG
- "ppp_tty_read: sleeping(read_wait)\n");
+ /* no data */
+ clear_bit (0, &ppp->ubuf->locked);
+ if (file->f_flags & O_NONBLOCK)
+ return -EAGAIN;
+ current->timeout = 0;
+#if 0
+ if (ppp->flags & SC_DEBUG)
+ printk (KERN_DEBUG
+ "ppp_tty_read: sleeping(read_wait)\n");
+#endif
+ interruptible_sleep_on (&ppp->read_wait);
+ if (current->signal & ~current->blocked)
+ return -EINTR;
+ }
- interruptible_sleep_on (&ppp->read_wait);
- if (current->signal & ~current->blocked)
- return -EINTR;
- continue;
- }
/*
* Ensure that the frame will fit within the caller's buffer. If not, then
* discard the frame from the input buffer.
*/
- if (len + 2 > nr) {
- /* Can't copy it, update us_rbuff_head */
+ if (len + 2 > nr) {
+ /* Can't copy it, update us_rbuff_head */
- if (ppp->flags & SC_DEBUG)
- printk (KERN_DEBUG
+ if (ppp->flags & SC_DEBUG)
+ printk (KERN_DEBUG
"ppp: read of %u bytes too small for %d "
"frame\n", nr, len + 2);
- ppp->ubuf->tail += len;
- ppp->ubuf->tail &= ppp->ubuf->size;
- clear_bit (0, &ppp->ubuf->locked);
- ppp->stats.ppp_ierrors++;
- return -EOVERFLOW;
- }
-/*
- * Before we attempt to write the frame to the user, ensure that the
- * page tables are proper.
- */
- indx = verify_area (VERIFY_WRITE, buf, len + 2);
- if (indx != 0) {
- ppp->ubuf->tail += len;
- ppp->ubuf->tail &= ppp->ubuf->size;
- clear_bit (0, &ppp->ubuf->locked);
- return (indx);
- }
+ ppp->stats.ppp_ierrors++;
+ error = -EOVERFLOW;
+ goto out;
+ }
+
/*
* Fake the insertion of the ADDRESS and CONTROL information because these
* were not saved in the buffer.
*/
- PUT_USER (error, (u_char) PPP_ALLSTATIONS, buf);
- ++buf;
- PUT_USER (error, (u_char) PPP_UI, buf);
- ++buf;
+ PUT_USER (error, (u_char) PPP_ALLSTATIONS, buf);
+ if (error)
+ goto out;
+ ++buf;
+ PUT_USER (error, (u_char) PPP_UI, buf);
+ if (error)
+ goto out;
+ ++buf;
- indx = len;
/*
* Copy the received data from the buffer to the caller's area.
*/
- while (indx-- > 0) {
- GETC (c);
- PUT_USER (error, c, buf);
- ++buf;
- }
-
- clear_bit (0, &ppp->ubuf->locked);
- len += 2; /* Account for ADDRESS and CONTROL bytes */
- if (ppp->flags & SC_DEBUG)
- printk (KERN_DEBUG
- "ppp_tty_read: passing %d bytes up\n", len);
- return len;
+ ret = len + 2; /* Account for ADDRESS and CONTROL bytes */
+ while (len-- > 0) {
+ GETC (c);
+ PUT_USER (error, c, buf);
+ if (error)
+ goto out;
+ ++buf;
}
+
+ clear_bit (0, &ppp->ubuf->locked);
+#if 0
+ if (ppp->flags & SC_DEBUG)
+ printk (KERN_DEBUG "ppp_tty_read: passing %d bytes up\n", ret);
+#endif
+ return ret;
+
+out:
+ ppp->ubuf->tail += len;
+ ppp->ubuf->tail &= ppp->ubuf->size;
+ clear_bit (0, &ppp->ubuf->locked);
+ return error;
#undef GETC
}
ppp_dev_xmit_lower (struct ppp *ppp, struct ppp_buffer *buf,
__u8 *data, int count, int non_ip)
{
- __u16 write_fcs;
+ __u16 write_fcs;
int address, control;
int proto;
+ CHECK_PPP_VOID();
+ CHECK_BUF_MAGIC(buf);
++ppp->stats.ppp_opackets;
ppp->stats.ppp_ooctects += count;
* Add the trailing flag character
*/
ins_char (buf, PPP_FLAG);
-/*
- * Print the buffer
- */
- if (ppp->flags & SC_LOG_FLUSH)
- ppp_print_buffer ("ppp flush", buf_base (buf),
- buf->count);
/*
* Send the block to the tty driver.
*/
}
/*
- * Send an frame to the remote with the proper bsd compression.
+ * Compress and send an frame to the peer.
*
* Return 0 if frame was queued for transmission.
* 1 if frame must be re-queued for later driver support.
int address, control;
__u8 *new_data;
int new_count;
+
+ CHECK_PPP(0);
+ CHECK_BUF_MAGIC(buf);
/*
* Print the buffer
*/
(control == PPP_UI) &&
(proto != PPP_LCP) &&
(proto != PPP_CCP)) {
- new_data = kmalloc (count, GFP_ATOMIC);
+ new_data = kmalloc (ppp->mtu, GFP_ATOMIC);
if (new_data == NULL) {
if (ppp->flags & SC_DEBUG)
printk (KERN_ERR
}
new_count = (*ppp->sc_xcomp->compress)
- (ppp->sc_xc_state, data, new_data, count, count);
+ (ppp->sc_xc_state, data, new_data, count, ppp->mtu);
if (new_count > 0 && (ppp->flags & SC_CCP_UP)) {
ppp_dev_xmit_lower (ppp, buf, new_data, new_count, 0);
*/
case PPP_CCP:
ppp_proto_ccp (ppp,
- data + PPP_HARD_HDR_LEN,
- len - PPP_HARD_HDR_LEN,
+ data + PPP_HDRLEN,
+ len - PPP_HDRLEN,
0);
break;
{
struct ppp *ppp = tty2ppp (tty);
__u8 *new_data;
- int status;
+ int proto;
+
/*
* Verify the pointers.
*/
"ppp_tty_write: no memory\n");
return 0;
}
+/*
+ * Retrieve the user's buffer
+ */
+ if (copy_from_user (new_data, data, count)) {
+ kfree (new_data);
+ return -EFAULT;
+ }
/*
* lock this PPP unit so we will be the only writer;
* sleep if necessary
*/
while (lock_buffer (ppp->tbuf) != 0) {
current->timeout = 0;
+#if 0
if (ppp->flags & SC_DEBUG)
printk (KERN_DEBUG "ppp_tty_write: sleeping\n");
+#endif
interruptible_sleep_on (&ppp->write_wait);
ppp = tty2ppp (tty);
return -EINTR;
}
}
-/*
- * Retrieve the user's buffer
- */
- COPY_FROM_USER (status,
- new_data,
- data,
- count);
-
- if (status != 0) {
- kfree (new_data);
- ppp->tbuf->locked = 0;
- return status;
- }
/*
* Change the LQR frame
*/
/*
* Send the data
*/
- ppp_dev_xmit_frame (ppp, ppp->tbuf, new_data, count);
+ if (proto == PPP_IP) {
+ /*
+ * IP frames can be sent by pppd when we're doing
+ * demand-dialling. We send them via ppp_dev_xmit_ip
+ * to make sure that VJ compression happens properly.
+ */
+ ppp_dev_xmit_ip(ppp, ppp->tbuf, new_data + PPP_HDRLEN,
+ count - PPP_HDRLEN);
+
+ } else {
+ ppp_dev_xmit_frame (ppp, ppp->tbuf, new_data, count);
+ }
+
kfree (new_data);
return (int) count;
}
int nb;
__u8 *ptr;
__u8 ccp_option[CCP_MAX_OPTION_LENGTH];
+ unsigned long flags;
+
/*
* Fetch the compression parameters
*/
if (ccp_option[1] < 2) /* preliminary check on the length byte */
return (-EINVAL);
- cp = find_compressor ((int) (unsigned int) (__u8) ccp_option[0]);
+ save_flags(flags);
+ cli();
+ ppp->flags &= ~(SC_COMP_RUN | SC_DECOMP_RUN);
+ restore_flags(flags);
+
+ cp = find_compressor (ccp_option[0]);
if (cp != (struct compressor *) 0) {
/*
* Found a handler for the protocol - try to allocate
if (ppp->sc_xc_state == NULL) {
if (ppp->flags & SC_DEBUG)
- printk("ppp%ld: comp_alloc failed\n",
- ppp2dev (ppp)->base_addr);
+ printk(KERN_DEBUG "%s: comp_alloc failed\n",
+ ppp->name);
error = -ENOBUFS;
+ } else {
+ if (ppp->flags & SC_DEBUG)
+ printk(KERN_DEBUG "%s: comp_alloc -> %p\n",
+ ppp->name, ppp->sc_xc_state);
}
- ppp->flags &= ~SC_COMP_RUN;
} else {
if (ppp->sc_rc_state != NULL)
(*ppp->sc_rcomp->decomp_free)(ppp->sc_rc_state);
ppp->sc_rc_state = cp->decomp_alloc(ccp_option, nb);
if (ppp->sc_rc_state == NULL) {
if (ppp->flags & SC_DEBUG)
- printk("ppp%ld: decomp_alloc failed\n",
- ppp2dev (ppp)->base_addr);
- error = ENOBUFS;
+ printk(KERN_DEBUG "%s: decomp_alloc failed\n",
+ ppp->name);
+ error = -ENOBUFS;
+ } else {
+ if (ppp->flags & SC_DEBUG)
+ printk(KERN_DEBUG "%s: decomp_alloc -> %p\n",
+ ppp->name, ppp->sc_rc_state);
}
- ppp->flags &= ~SC_DECOMP_RUN;
}
return (error);
}
if (ppp->flags & SC_DEBUG)
- printk(KERN_DEBUG "ppp%ld: no compressor for [%x %x %x], %x\n",
- ppp2dev (ppp)->base_addr, ccp_option[0], ccp_option[1],
+ printk(KERN_DEBUG "%s: no compressor for [%x %x %x], %x\n",
+ ppp->name, ccp_option[0], ccp_option[1],
ccp_option[2], nb);
return (-EINVAL); /* no handler found */
}
static int
ppp_tty_ioctl (struct tty_struct *tty, struct file * file,
- unsigned int param2, unsigned long param3)
+ unsigned int param2, unsigned long param3)
{
struct ppp *ppp = tty2ppp (tty);
register int temp_i = 0;
switch (param2) {
case PPPIOCSMRU:
GET_USER (error, temp_i, (int *) param3);
- if (error == 0) {
- if (ppp->flags & SC_DEBUG)
- printk (KERN_INFO
- "ppp_tty_ioctl: set mru to %x\n", temp_i);
+ if (error != 0)
+ break;
+ if (ppp->flags & SC_DEBUG)
+ printk (KERN_INFO
+ "ppp_tty_ioctl: set mru to %x\n", temp_i);
- if (ppp->mru != temp_i)
- ppp_changedmtu (ppp, ppp2dev (ppp)->mtu, temp_i);
- }
+ if (ppp->mru != temp_i)
+ ppp_changedmtu (ppp, ppp2dev (ppp)->mtu, temp_i);
break;
/*
* Fetch the flags
*/
case PPPIOCSFLAGS:
GET_USER (error, temp_i, (int *) param3);
- if (error == 0) {
- temp_i &= SC_MASK;
- temp_i |= (ppp->flags & ~SC_MASK);
-
- if ((ppp->flags & SC_CCP_OPEN) &&
- (temp_i & SC_CCP_OPEN) == 0)
- ppp_ccp_closed (ppp);
-
- if ((ppp->flags | temp_i) & SC_DEBUG)
- printk (KERN_INFO
- "ppp_tty_ioctl: set flags to %x\n", temp_i);
- ppp->flags = temp_i;
- }
+ if (error != 0)
+ break;
+ temp_i &= SC_MASK;
+ temp_i |= (ppp->flags & ~SC_MASK);
+
+ if ((ppp->flags & SC_CCP_OPEN) &&
+ (temp_i & SC_CCP_OPEN) == 0)
+ ppp_ccp_closed (ppp);
+
+ if ((ppp->flags | temp_i) & SC_DEBUG)
+ printk (KERN_INFO
+ "ppp_tty_ioctl: set flags to %x\n", temp_i);
+ ppp->flags = temp_i;
break;
/*
* Set the compression mode
*/
case PPPIOCSASYNCMAP:
GET_USER (error, temp_i, (int *) param3);
- if (error == 0) {
- ppp->xmit_async_map[0] = temp_i;
- if (ppp->flags & SC_DEBUG)
- printk (KERN_INFO
- "ppp_tty_ioctl: set xmit asyncmap %x\n",
- ppp->xmit_async_map[0]);
- }
+ if (error != 0)
+ break;
+ ppp->xmit_async_map[0] = temp_i;
+ if (ppp->flags & SC_DEBUG)
+ printk (KERN_INFO
+ "ppp_tty_ioctl: set xmit asyncmap %x\n",
+ ppp->xmit_async_map[0]);
break;
/*
* Set the receive async map
*/
case PPPIOCSRASYNCMAP:
GET_USER (error, temp_i, (int *) param3);
- if (error == 0) {
- ppp->recv_async_map = temp_i;
- if (ppp->flags & SC_DEBUG)
- printk (KERN_INFO
- "ppp_tty_ioctl: set rcv asyncmap %x\n",
- ppp->recv_async_map);
- }
+ if (error != 0)
+ break;
+ ppp->recv_async_map = temp_i;
+ if (ppp->flags & SC_DEBUG)
+ printk (KERN_INFO
+ "ppp_tty_ioctl: set rcv asyncmap %x\n",
+ ppp->recv_async_map);
break;
/*
* Obtain the unit number for this device.
*/
case PPPIOCGUNIT:
PUT_USER (error, ppp2dev (ppp)->base_addr, (int *) param3);
- if (error == 0) {
- if (ppp->flags & SC_DEBUG)
- printk (KERN_INFO
- "ppp_tty_ioctl: get unit: %ld\n",
- ppp2dev (ppp)->base_addr);
- }
+ if (error != 0)
+ break;
+ if (ppp->flags & SC_DEBUG)
+ printk (KERN_INFO
+ "ppp_tty_ioctl: get unit: %ld\n",
+ ppp2dev (ppp)->base_addr);
break;
/*
* Set the debug level
*/
case PPPIOCSDEBUG:
GET_USER (error, temp_i, (int *) param3);
- if (error == 0) {
- temp_i = (temp_i & 0x1F) << 16;
- temp_i |= (ppp->flags & ~0x1F0000);
-
- if ((ppp->flags | temp_i) & SC_DEBUG)
- printk (KERN_INFO
- "ppp_tty_ioctl: set flags to %x\n", temp_i);
- ppp->flags = temp_i;
- }
+ if (error != 0)
+ break;
+ temp_i = (temp_i & 0x1F) << 16;
+ temp_i |= (ppp->flags & ~0x1F0000);
+
+ if ((ppp->flags | temp_i) & SC_DEBUG)
+ printk (KERN_INFO
+ "ppp_tty_ioctl: set flags to %x\n", temp_i);
+ ppp->flags = temp_i;
break;
/*
* Get the debug level
(void *) param3,
sizeof (temp_tbl));
- if (error == 0) {
- temp_tbl[1] = 0x00000000;
- temp_tbl[2] &= ~0x40000000;
- temp_tbl[3] |= 0x60000000;
-
- if ((temp_tbl[2] & temp_tbl[3]) != 0 ||
- (temp_tbl[4] & temp_tbl[5]) != 0 ||
- (temp_tbl[6] & temp_tbl[7]) != 0)
- error = -EINVAL;
- else {
- memcpy (ppp->xmit_async_map,
- temp_tbl,
- sizeof (ppp->xmit_async_map));
-
- if (ppp->flags & SC_DEBUG)
- printk (KERN_INFO
- "ppp_tty_ioctl: set xasyncmap\n");
- }
+ if (error != 0)
+ break;
+ temp_tbl[1] = 0x00000000;
+ temp_tbl[2] &= ~0x40000000;
+ temp_tbl[3] |= 0x60000000;
+
+ if ((temp_tbl[2] & temp_tbl[3]) != 0 ||
+ (temp_tbl[4] & temp_tbl[5]) != 0 ||
+ (temp_tbl[6] & temp_tbl[7]) != 0)
+ error = -EINVAL;
+ else {
+ memcpy (ppp->xmit_async_map,
+ temp_tbl,
+ sizeof (ppp->xmit_async_map));
+
+ if (ppp->flags & SC_DEBUG)
+ printk (KERN_INFO
+ "ppp_tty_ioctl: set xasyncmap\n");
}
}
break;
*/
case PPPIOCSMAXCID:
GET_USER (error, temp_i, (int *) param3);
- if (error == 0) {
- temp_i = (temp_i & 255) + 1;
+ if (error != 0)
+ break;
+ temp_i = (temp_i & 255) + 1;
+ if (ppp->flags & SC_DEBUG)
+ printk (KERN_INFO
+ "ppp_tty_ioctl: set maxcid to %d\n",
+ temp_i);
+ if (ppp->slcomp != NULL)
+ slhc_free (ppp->slcomp);
+ ppp->slcomp = slhc_init (16, temp_i);
+
+ if (ppp->slcomp == NULL) {
if (ppp->flags & SC_DEBUG)
- printk (KERN_INFO
- "ppp_tty_ioctl: set maxcid to %d\n",
- temp_i);
- if (ppp->slcomp != NULL)
- slhc_free (ppp->slcomp);
- ppp->slcomp = slhc_init (16, temp_i);
-
- if (ppp->slcomp == NULL) {
- if (ppp->flags & SC_DEBUG)
- printk (KERN_ERR
+ printk (KERN_ERR
"ppp: no space for compression buffers!\n");
- ppp_release (ppp);
- error = -ENOMEM;
- }
+ ppp_release (ppp);
+ error = -ENOMEM;
}
break;
case PPPIOCSNPMODE:
{
struct npioctl npi;
+
COPY_FROM_USER (error,
&npi,
(void *) param3,
sizeof (npi));
-
if (error != 0)
break;
break;
}
- if (npi.mode != ppp->sc_npmode[npi.protocol]) {
- ppp->sc_npmode[npi.protocol] = npi.mode;
- if (npi.mode != NPMODE_QUEUE) {
- /* ppp_requeue(ppp); maybe needed */
- ppp_tty_wakeup (ppp2tty(ppp));
- }
- }
+ ppp->sc_npmode[npi.protocol] = npi.mode;
+ if (ppp->flags & SC_DEBUG)
+ printk(KERN_DEBUG "ppp: set np %d to %d\n",
+ npi.protocol, npi.mode);
}
break;
/*
/*
* TTY callback.
*
- * Process the select() statement for the PPP device.
+ * Process the select() (or poll()) statement for the PPP device.
*/
+#if LINUX_VERSION_CODE < VERSION(2,1,23)
static int
ppp_tty_select (struct tty_struct *tty, struct inode *inode,
struct file *filp, int sel_type, select_table * wait)
*/
switch (sel_type) {
case SEL_IN:
- if (set_bit (0, &ppp->ubuf->locked) == 0) {
+ if (test_and_set_bit (0, &ppp->ubuf->locked) == 0) {
/* Test for the presence of data in the queue */
if (ppp->ubuf->head != ppp->ubuf->tail) {
clear_bit (0, &ppp->ubuf->locked);
return result;
}
+#else /* 2.1.23 or later */
+
+static unsigned int
+ppp_tty_poll (struct tty_struct *tty, struct file *filp, poll_table * wait)
+{
+ struct ppp *ppp = tty2ppp (tty);
+ unsigned int mask = 0;
+
+ if (ppp && ppp->magic == PPP_MAGIC && tty == ppp->tty) {
+ CHECK_PPP (0);
+
+ poll_wait(&ppp->read_wait, wait);
+ poll_wait(&ppp->write_wait, wait);
+
+ /* Must lock the user buffer area while checking. */
+ if(test_and_set_bit(0, &ppp->ubuf->locked) == 0) {
+ if(ppp->ubuf->head != ppp->ubuf->tail)
+ mask |= POLLIN | POLLRDNORM;
+ clear_bit(0, &ppp->ubuf->locked);
+ }
+ if(tty->flags & (1 << TTY_OTHER_CLOSED))
+ mask |= POLLHUP;
+ if(tty_hung_up_p(filp))
+ mask |= POLLHUP;
+ if(ppp->tbuf->locked == 0)
+ mask |= POLLOUT | POLLWRNORM;
+ }
+ return mask;
+}
+
+#endif
+
/*************************************************************
* NETWORK OUTPUT
* This routine accepts requests from the network layer
struct ppp *ppp = dev2ppp (dev);
/* reset POINTOPOINT every time, since dev_close zaps it! */
- dev->flags |= IFF_POINTOPOINT;
+ dev->flags |= IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
if (ppp2tty (ppp) == NULL) {
if (ppp->flags & SC_DEBUG)
* Supply the information for the caller.
*/
memset (&temp, 0, sizeof(temp));
- if (error == 0 && dev->flags & IFF_UP) {
+ if (dev->flags & IFF_UP) {
if (ppp->sc_xc_state != NULL)
(*ppp->sc_xcomp->comp_stat) (ppp->sc_xc_state,
&temp.c);
{
struct ppp *ppp = dev2ppp (dev);
int error;
+
+ CHECK_PPP_MAGIC(ppp);
/*
* Process the requests
*/
*
* Return 0 if frame was queued for transmission.
* 1 if frame must be re-queued for later driver support.
+ * -1 if frame should be dropped.
*/
static int
-ppp_dev_xmit_ip (struct device *dev, struct ppp *ppp, __u8 *data)
+ppp_dev_xmit_ip (struct ppp *ppp, struct ppp_buffer *buf,
+ __u8 *data, int len)
{
- int proto = PPP_IP;
- int len;
- struct ppp_hdr *hdr;
- struct tty_struct *tty = ppp2tty (ppp);
-/*
- * Obtain the length from the IP header.
- */
- len = ((struct iphdr *)data) -> tot_len;
- len = ntohs (len);
-/*
- * Validate the tty interface
- */
- if (tty == NULL) {
- if (ppp->flags & SC_DEBUG)
- printk (KERN_ERR
- "ppp_dev_xmit: %s not connected to a TTY!\n",
- dev->name);
- return 0;
- }
-/*
- * Ensure that the PPP device is still up
- */
- if (!(dev->flags & IFF_UP)) {
- if (ppp->flags & SC_DEBUG)
- printk (KERN_WARNING
- "ppp_dev_xmit: packet sent on interface %s,"
- " which is down for IP\n",
- dev->name);
- return 0;
- }
+ int proto = PPP_IP;
+ __u8 *hdr;
/*
* Branch on the type of processing for the IP frame.
*/
case NPMODE_PASS:
break;
+ case NPMODE_QUEUE:
+ /*
+ * We may not send the packet now, so drop it.
+ * XXX It would be nice to be able to return it to the
+ * network system to be queued and retransmitted later.
+ */
+ if (ppp->flags & SC_DEBUG)
+ printk(KERN_DEBUG "%s: returning frame\n",
+ ppp->name);
+ return -1;
+
case NPMODE_ERROR:
case NPMODE_DROP:
if (ppp->flags & SC_DEBUG)
printk (KERN_DEBUG
"ppp_dev_xmit: npmode = %d on %s\n",
- ppp->sc_npmode[NP_IP], dev->name);
- return 0;
-
- case NPMODE_QUEUE:
- break;
+ ppp->sc_npmode[NP_IP], ppp->name);
+ return -1;
default:
if (ppp->flags & SC_DEBUG)
printk (KERN_WARNING
"ppp_dev_xmit: unknown npmode %d on %s\n",
- ppp->sc_npmode[NP_IP],
- dev->name);
- return 0;
- }
-/*
- * Detect a change in the transfer size
- */
- if (ppp->mtu != ppp2dev (ppp)->mtu) {
- ppp_changedmtu (ppp,
- ppp2dev (ppp)->mtu,
- ppp->mru);
+ ppp->sc_npmode[NP_IP], ppp->name);
+ return -1;
}
-/*
- * Acquire the lock on the transmission buffer. If the buffer was busy then
- * mark the device as busy.
- */
- if (lock_buffer (ppp->wbuf) != 0) {
- dev->tbusy = 1;
- return 1;
- }
-/*
- * Print the frame being sent
- */
- if (ppp->flags & SC_LOG_OUTPKT)
- ppp_print_buffer ("ppp outpkt", data, len);
/*
* At this point, the buffer will be transmitted. There is no other exit.
*
*/
if (ppp->flags & SC_COMP_TCP) {
len = slhc_compress (ppp->slcomp, data, len,
- buf_base (ppp->cbuf) + PPP_HARD_HDR_LEN,
+ buf_base (ppp->cbuf) + PPP_HDRLEN,
&data,
(ppp->flags & SC_NO_TCP_CCID) == 0);
/*
* Send the frame
*/
- len += PPP_HARD_HDR_LEN;
- hdr = &((struct ppp_hdr *) data)[-1];
+ len += PPP_HDRLEN;
+ hdr = data - PPP_HDRLEN;
- hdr->address = PPP_ALLSTATIONS;
- hdr->control = PPP_UI;
- hdr->protocol[0] = 0;
- hdr->protocol[1] = proto;
+ hdr[0] = PPP_ALLSTATIONS;
+ hdr[1] = PPP_UI;
+ hdr[2] = 0;
+ hdr[3] = proto;
- return ppp_dev_xmit_frame (ppp, ppp->wbuf, (__u8 *) hdr, len);
+ return ppp_dev_xmit_frame (ppp, ppp->wbuf, hdr, len);
}
/*
- * Send an IPX (or any other non-IP) frame to the remote.
+ * Send a non-IP data frame (such as an IPX frame) to the remote.
*
* Return 0 if frame was queued for transmission.
* 1 if frame must be re-queued for later driver support.
*/
static int
-ppp_dev_xmit_ipx (struct device *dev, struct ppp *ppp,
+ppp_dev_xmit_other (struct device *dev, struct ppp *ppp,
__u8 *data, int len, int proto)
{
- struct tty_struct *tty = ppp2tty (ppp);
- struct ppp_hdr *hdr;
-/*
- * Validate the tty interface
- */
- if (tty == NULL) {
- if (ppp->flags & SC_DEBUG)
- printk (KERN_ERR
- "ppp_dev_xmit: %s not connected to a TTY!\n",
- dev->name);
- return 0;
- }
-/*
- * Ensure that the PPP device is still up
- */
- if (!(dev->flags & IFF_UP)) {
- if (ppp->flags & SC_DEBUG)
- printk (KERN_WARNING
- "ppp_dev_xmit: packet sent on interface %s,"
- " which is down\n",
- dev->name);
- return 0;
- }
-/*
- * Detect a change in the transfer size
- */
- if (ppp->mtu != ppp2dev (ppp)->mtu) {
- ppp_changedmtu (ppp,
- ppp2dev (ppp)->mtu,
- ppp->mru);
- }
-/*
- * Acquire the lock on the transmission buffer. If the buffer was busy then
- * mark the device as busy.
- */
- if (lock_buffer (ppp->wbuf) != 0) {
- dev->tbusy = 1;
- return 1;
- }
-/*
- * Print the frame being sent
- */
- if (ppp->flags & SC_LOG_OUTPKT)
- ppp_print_buffer ("ppp outpkt", data, len);
+ __u8 *hdr;
/*
* Send the frame
*/
- len += PPP_HARD_HDR_LEN;
- hdr = &((struct ppp_hdr *) data)[-1];
+ len += PPP_HDRLEN;
+ hdr = data - PPP_HDRLEN;
- hdr->address = PPP_ALLSTATIONS;
- hdr->control = PPP_UI;
- hdr->protocol[0] = proto >> 8;
- hdr->protocol[1] = proto;
+ hdr[0] = PPP_ALLSTATIONS;
+ hdr[1] = PPP_UI;
+ hdr[2] = proto >> 8;
+ hdr[3] = proto;
- return ppp_dev_xmit_frame (ppp, ppp->wbuf, (__u8 *) hdr, len);
+ return ppp_dev_xmit_frame (ppp, ppp->wbuf, hdr, len);
}
/*
*/
if (!ppp->inuse) {
dev_kfree_skb (skb, FREE_WRITE);
- dev_close (dev);
return 0;
}
/*
dev_kfree_skb (skb, FREE_WRITE);
return 0;
}
+/*
+ * Detect a change in the transfer size
+ */
+ if (ppp->mtu != ppp2dev (ppp)->mtu) {
+ ppp_changedmtu (ppp,
+ ppp2dev (ppp)->mtu,
+ ppp->mru);
+ }
+/*
+ * Acquire the lock on the transmission buffer. If the buffer was busy then
+ * mark the device as busy.
+ * We also require that ppp->tbuf be unlocked, in order to serialize
+ * calls to ppp_dev_xmit_frame (which does compression) and the output
+ * of frames w.r.t. tty writes from pppd.
+ */
+ CHECK_BUF_MAGIC(ppp->wbuf);
+ if (ppp->tbuf->locked || lock_buffer (ppp->wbuf) != 0) {
+ dev->tbusy = 1;
+ if (ppp->flags & SC_DEBUG)
+ printk(KERN_DEBUG "dev_xmit blocked, t=%d w=%d\n",
+ ppp->tbuf->locked, ppp->wbuf->locked);
+ return 1;
+ }
/*
* Look at the protocol in the skb to determine the difference between
* an IP frame and an IPX frame.
*/
switch (ntohs (skb->protocol)) {
case ETH_P_IPX:
- answer = ppp_dev_xmit_ipx (dev, ppp, data, len, PPP_IPX);
+ answer = ppp_dev_xmit_other (dev, ppp, data, len, PPP_IPX);
break;
case ETH_P_IP:
- answer = ppp_dev_xmit_ip (dev, ppp, data);
+ answer = ppp_dev_xmit_ip (ppp, ppp->wbuf, data, len);
break;
default: /* All others have no support at this time. */
* This is the end of the transmission. Release the buffer if it was sent.
*/
if (answer == 0) {
+ /* packet queued OK */
dev_kfree_skb (skb, FREE_WRITE);
ppp->ddinfo.xmit_idle = jiffies;
+ } else {
+ ppp->wbuf->locked = 0;
+ if (answer < 0) {
+ /* packet should be dropped */
+ dev_kfree_skb (skb, FREE_WRITE);
+ answer = 0;
+ } else {
+ /* packet should be queued for later */
+ dev->tbusy = 1;
+ }
}
return answer;
}
static struct ppp *
ppp_find (int pid_value)
{
- int if_num;
- ppp_ctrl_t *ctl;
struct ppp *ppp;
- /* try to find the exact same free device which we had before */
- ctl = ppp_list;
- if_num = 0;
-
- while (ctl) {
- ppp = ctl2ppp (ctl);
- if (ppp->sc_xfer == pid_value) {
- set_bit(0, &ppp->inuse);
+ /* try to find the device which this pid is already using */
+ for (ppp = ppp_list; ppp != 0; ppp = ppp->next) {
+ if (ppp->inuse && ppp->sc_xfer == pid_value) {
ppp->sc_xfer = 0;
- return (ppp);
- }
- ctl = ctl->next;
- if (++if_num == max_dev)
break;
+ }
}
- return NULL;
+ return ppp;
}
/* allocate or create a PPP channel */
{
int if_num;
int status;
- ppp_ctrl_t *ctl;
struct device *dev;
struct ppp *ppp;
/* try to find an free device */
- ctl = ppp_list;
- if_num = 0;
-
- while (ctl) {
- ppp = ctl2ppp (ctl);
+ if_num = 0;
+ for (ppp = ppp_list; ppp != 0; ppp = ppp->next) {
if (!set_bit(0, &ppp->inuse))
- return (ppp);
- ctl = ctl->next;
- if (++if_num == max_dev)
- return (NULL);
+ return ppp;
+ ++if_num;
}
/*
- * There are no available items. Allocate a device from the system pool
+ * There are no available units, so make a new one.
*/
- ctl = (ppp_ctrl_t *) kmalloc (sizeof(ppp_ctrl_t), GFP_KERNEL);
- if (ctl) {
- (void) memset(ctl, 0, sizeof(ppp_ctrl_t));
- ppp = ctl2ppp (ctl);
- dev = ctl2dev (ctl);
-
- /* initialize channel control data */
- set_bit(0, &ppp->inuse);
-
- ppp->line = if_num;
- ppp->tty = NULL;
- ppp->backup_tty = NULL;
- ppp->dev = dev;
-
- dev->next = NULL;
- dev->init = ppp_init_dev;
- dev->name = ctl->name;
- dev->base_addr = (__u32) if_num;
- dev->priv = (void *) ppp;
-
- sprintf (dev->name, "ppp%d", if_num);
-
- /* link in the new channel */
- ctl->next = ppp_list;
- ppp_list = ctl;
-
- /* register device so that we can be ifconfig'd */
- /* ppp_init_dev() will be called as a side-effect */
+ ppp = (struct ppp *) kmalloc (sizeof(struct ppp), GFP_KERNEL);
+ if (ppp == 0)
+ return 0;
+ memset(ppp, 0, sizeof(*ppp));
- status = register_netdev (dev);
- if (status == 0) {
- printk (KERN_INFO "registered device %s\n", dev->name);
- return (ppp);
- }
+ /* initialize channel control data */
+ set_bit(0, &ppp->inuse);
+ ppp->line = if_num;
+ ppp->tty = NULL;
+ ppp->backup_tty = NULL;
+ if (ppp_last == 0)
+ ppp_list = ppp;
+ else
+ ppp_last->next = ppp;
+ ppp_last = ppp;
+ ppp->next = 0;
+
+ dev = ppp2dev(ppp);
+ dev->next = NULL;
+ dev->init = ppp_init_dev;
+ dev->name = ppp->name;
+ sprintf(dev->name, "ppp%d", if_num);
+ dev->base_addr = (__u32) if_num;
+ dev->priv = (void *) ppp;
+
+ /* register device so that we can be ifconfig'd */
+ /* ppp_init_dev() will be called as a side-effect */
+ status = register_netdev (dev);
+ if (status == 0) {
+ printk (KERN_INFO "registered device %s\n", dev->name);
+ } else {
printk (KERN_ERR
"ppp_alloc - register_netdev(%s) = %d failure.\n",
dev->name, status);
+ ppp = NULL;
/* This one will forever be busy as it is not initialized */
}
- return (NULL);
+ return ppp;
}
/*
cleanup_module(void)
{
int status;
- ppp_ctrl_t *ctl, *next_ctl;
struct device *dev;
- struct ppp *ppp;
+ struct ppp *ppp, *next_ppp;
int busy_flag = 0;
/*
* Ensure that the devices are not in operation.
*/
- ctl = ppp_list;
- while (ctl) {
- ppp = ctl2ppp (ctl);
+ for (ppp = ppp_list; ppp != 0; ppp = ppp->next) {
if (ppp->inuse && ppp->tty != NULL) {
busy_flag = 1;
break;
}
- dev = ctl2dev (ctl);
+ dev = ppp2dev (ppp);
if (dev->start || dev->flags & IFF_UP) {
busy_flag = 1;
break;
}
- ctl = ctl->next;
}
/*
* Ensure that there are no compressor modules registered
/*
* De-register the devices so that there is no problem with them
*/
- next_ctl = ppp_list;
- while (next_ctl) {
- ctl = next_ctl;
- next_ctl = ctl->next;
- ppp = ctl2ppp (ctl);
- dev = ctl2dev (ctl);
-
- ppp_release (ppp);
- unregister_netdev (dev);
- kfree (ctl);
+ for (ppp = ppp_list; ppp != 0; ppp = next_ppp) {
+ next_ppp = ppp->next;
+ ppp_release (ppp);
+ unregister_netdev (&ppp->dev);
+ kfree (ppp);
}
}
#endif
projects / ppp.git / blobdiff