patch-2.1.109 linux/drivers/net/ppp.c
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- Lines: 5002
- Date:
Fri Jul 10 14:02:00 1998
- Orig file:
v2.1.108/linux/drivers/net/ppp.c
- Orig date:
Tue Jun 23 10:01:23 1998
diff -u --recursive --new-file v2.1.108/linux/drivers/net/ppp.c linux/drivers/net/ppp.c
@@ -2,15 +2,9 @@
*
* Michael Callahan <callahan@maths.ox.ac.uk>
* Al Longyear <longyear@netcom.com>
- * Paul Mackerras <Paul.Mackerras@cs.anu.edu.au>
- * Cyrus Durgin <cider@speakeasy.org> (changes for kmod)
+ * Extensively rewritten by Paul Mackerras <paulus@cs.anu.edu.au>
*
- * Dynamic PPP devices by Jim Freeman <jfree@caldera.com>.
- * ppp_tty_receive ``noisy-raise-bug'' fixed by Ove Ewerlid <ewerlid@syscon.uu.se>
- *
- * Machine hang caused by NULLing a live wait queue fix. <Alan.Cox@linux.org>
- *
- * ==FILEVERSION 980608==
+ * ==FILEVERSION 980704==
*
* NOTE TO MAINTAINERS:
* If you modify this file at all, please set the number above to the
@@ -47,21 +41,22 @@
*/
#define OPTIMIZE_FLAG_TIME ((HZ * 3)/2)
-
#define CHECK_CHARACTERS 1
-#define PPP_COMPRESS 1
-/* $Id: ppp.c,v 1.14 1997/11/27 06:04:45 paulus Exp $ */
+#define PPP_MAX_RCV_QLEN 32 /* max # frames we queue up for pppd */
+
+/* $Id: ppp.c,v 1.19 1998/07/07 04:27:37 paulus Exp $ */
-#include <linux/config.h> /* for CONFIG_KMOD */
+#include <linux/version.h>
+#include <linux/config.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/types.h>
#include <linux/fcntl.h>
-#include <linux/poll.h>
#include <linux/interrupt.h>
#include <linux/ptrace.h>
+#include <linux/poll.h>
#include <linux/in.h>
#include <linux/malloc.h>
#include <linux/tty.h>
@@ -72,18 +67,13 @@
#include <asm/system.h>
#include <asm/bitops.h>
#include <asm/uaccess.h>
+
#include <linux/if.h>
#include <linux/if_ether.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
-#include <linux/rtnetlink.h>
#include <linux/inet.h>
#include <linux/ioctl.h>
-#include <linux/init.h>
-
-typedef struct sk_buff sk_buff;
-#define skb_data(skb) ((__u8 *) (skb)->data)
-
#include <linux/ip.h>
#include <linux/tcp.h>
#include <linux/if_arp.h>
@@ -101,49 +91,38 @@
#include <linux/kmod.h>
#endif
-#ifndef PPP_IPX
-#define PPP_IPX 0x2b /* IPX protocol over PPP */
-#endif
-
-#ifndef PPP_LQR
-#define PPP_LQR 0xc025 /* Link Quality Reporting Protocol */
-#endif
+/*
+ * Local functions
+ */
#ifdef CONFIG_MODULES
static int ppp_register_compressor (struct compressor *cp);
static void ppp_unregister_compressor (struct compressor *cp);
#endif
-/*
- * Local functions
- */
+static void ppp_async_init(struct ppp *ppp);
+static void ppp_async_release(struct ppp *ppp);
+static int ppp_tty_push(struct ppp *ppp);
+static int ppp_async_encode(struct ppp *ppp);
+static int ppp_async_send(struct ppp *, struct sk_buff *);
+
+static int ppp_ioctl(struct ppp *, unsigned int, unsigned long);
+static int ppp_set_compression (struct ppp *ppp, struct ppp_option_data *odp);
+static void ppp_proto_ccp(struct ppp *ppp, __u8 *dp, int len, int rcvd);
+static void ppp_ccp_closed(struct ppp *ppp);
+static int ppp_receive_frame(struct ppp *, struct sk_buff *);
+static void ppp_receive_error(struct ppp *ppp);
+static void ppp_output_wakeup(struct ppp *ppp);
+static void ppp_send_ctrl(struct ppp *ppp, struct sk_buff *skb);
+static void ppp_send_frame(struct ppp *ppp, struct sk_buff *skb);
+static struct sk_buff *ppp_vj_compress(struct ppp *ppp, struct sk_buff *skb);
-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 struct ppp *ppp_alloc (void);
static struct ppp *ppp_find (int pid_value);
-static void ppp_print_buffer (const __u8 *, const __u8 *, int);
-extern inline void ppp_stuff_char (struct ppp *ppp,
- 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, enum NPmode npmode);
-
-static int rcv_proto_ip (struct ppp *, __u16, __u8 *, int);
-static int rcv_proto_ipx (struct ppp *, __u16, __u8 *, int);
-static int rcv_proto_vjc_comp (struct ppp *, __u16, __u8 *, int);
-static int rcv_proto_vjc_uncomp (struct ppp *, __u16, __u8 *, int);
-static int rcv_proto_unknown (struct ppp *, __u16, __u8 *, int);
-static int rcv_proto_lqr (struct ppp *, __u16, __u8 *, int);
-static void ppp_doframe_lower (struct ppp *, __u8 *, int);
-static int ppp_doframe (struct ppp *);
-
-static void ppp_proto_ccp (struct ppp *ppp, __u8 *dp, int len, int rcvd);
-static int rcv_proto_ccp (struct ppp *, __u16, __u8 *, int);
-
-#define ins_char(pbuf,c) (buf_base(pbuf) [(pbuf)->count++] = (__u8)(c))
+static struct ppp *ppp_alloc (void);
+static void ppp_generic_init(struct ppp *ppp);
+static void ppp_release(struct ppp *ppp);
+static void ppp_print_buffer (const char *, const __u8 *, int);
+static struct compressor *find_compressor (int type);
#ifndef OPTIMIZE_FLAG_TIME
#define OPTIMIZE_FLAG_TIME 0
@@ -156,68 +135,26 @@
static int flag_time = OPTIMIZE_FLAG_TIME;
MODULE_PARM(flag_time, "i");
-/*
- * The "main" procedure to the ppp device
- */
-
-int ppp_init (struct device *);
-
-/*
- * Network device driver callback routines
- */
-
-static int ppp_dev_open (struct device *);
-static int ppp_dev_ioctl (struct device *dev, struct ifreq *ifr, int cmd);
-static int ppp_dev_close (struct device *);
-static int ppp_dev_xmit (sk_buff *, struct device *);
-static struct net_device_stats *ppp_dev_stats (struct device *);
-
-/*
- * TTY callbacks
- */
-
-static ssize_t ppp_tty_read (struct tty_struct *, struct file *, __u8 *,
- size_t);
-static ssize_t ppp_tty_write (struct tty_struct *, struct file *,
- const __u8 *, size_t);
-static int ppp_tty_ioctl (struct tty_struct *, struct file *, unsigned int,
- unsigned long);
-static unsigned int ppp_tty_poll (struct tty_struct *tty, struct file *filp,
- poll_table * wait);
-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);
-static void ppp_tty_receive (struct tty_struct *tty, const __u8 * cp,
- char *fp, int count);
-static void ppp_tty_wakeup (struct tty_struct *tty);
-
#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__); \
+ printk(ppp_magic_warn, ppp, __FILE__, __LINE__); \
} \
} while (0)
#define CHECK_PPP(a) do { \
CHECK_PPP_MAGIC(ppp); \
if (!ppp->inuse) { \
- printk (ppp_warning, __LINE__); \
+ printk(ppp_warning, __LINE__); \
return a; \
} \
} while (0)
#define CHECK_PPP_VOID() do { \
CHECK_PPP_MAGIC(ppp); \
if (!ppp->inuse) { \
- printk (ppp_warning, __LINE__); \
+ printk(ppp_warning, __LINE__); \
return; \
} \
} 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) && \
- ppp->recv_async_map & (1 << (c)))
-
-#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) ((ppp)->tty)
@@ -226,39 +163,43 @@
static struct ppp *ppp_list = NULL;
static struct ppp *ppp_last = NULL;
-/* Buffer types */
-#define BUFFER_TYPE_DEV_RD 0 /* ppp read buffer */
-#define BUFFER_TYPE_TTY_WR 1 /* tty write buffer */
-#define BUFFER_TYPE_DEV_WR 2 /* ppp write buffer */
-#define BUFFER_TYPE_TTY_RD 3 /* tty read buffer */
-#define BUFFER_TYPE_VJ 4 /* vj compression buffer */
-
-/* Define this string only once for all macro invocations */
+/* Define these strings only once for all macro invocations */
static char ppp_warning[] = KERN_WARNING "PPP: ALERT! not INUSE! %d\n";
+static char ppp_magic_warn[] = KERN_WARNING "bad magic for ppp %p at %s:%d\n";
static char szVersion[] = PPP_VERSION;
-/*
- * Information for the protocol decoder
- */
+EXPORT_SYMBOL(ppp_register_compressor);
+EXPORT_SYMBOL(ppp_unregister_compressor);
-typedef int (*pfn_proto) (struct ppp *, __u16, __u8 *, int);
+/*************************************************************
+ * LINE DISCIPLINE SUPPORT
+ * The following code implements the PPP line discipline
+ * and supports using PPP on an async serial line.
+ *************************************************************/
-typedef struct ppp_proto_struct {
- int proto;
- pfn_proto func;
-} ppp_proto_type;
+#define in_xmap(ppp,c) (ppp->xmit_async_map[(c) >> 5] & (1 << ((c) & 0x1f)))
+#define in_rmap(ppp,c) ((((unsigned int) (__u8) (c)) < 0x20) && \
+ ppp->recv_async_map & (1 << (c)))
-static
-ppp_proto_type proto_list[] = {
- { PPP_IP, rcv_proto_ip },
- { PPP_IPX, rcv_proto_ipx },
- { PPP_VJC_COMP, rcv_proto_vjc_comp },
- { PPP_VJC_UNCOMP, rcv_proto_vjc_uncomp },
- { PPP_LQR, rcv_proto_lqr },
- { PPP_CCP, rcv_proto_ccp },
- { 0, rcv_proto_unknown } /* !!! MUST BE LAST !!! */
-};
+/*
+ * TTY callbacks
+ */
+
+static ssize_t ppp_tty_read(struct tty_struct *, struct file *, __u8 *,
+ size_t);
+static ssize_t ppp_tty_write(struct tty_struct *, struct file *, const __u8 *,
+ size_t);
+static int ppp_tty_ioctl(struct tty_struct *, struct file *, unsigned int,
+ unsigned long);
+static unsigned int ppp_tty_poll(struct tty_struct *tty, struct file *filp,
+ poll_table * wait);
+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);
+static void ppp_tty_receive (struct tty_struct *tty, const __u8 * cp,
+ char *fp, int count);
+static void ppp_tty_wakeup (struct tty_struct *tty);
__u16 ppp_crc16_table[256] =
{
@@ -295,6 +236,7 @@
0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330,
0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78
};
+EXPORT_SYMBOL(ppp_crc16_table);
#ifdef CHECK_CHARACTERS
static __u32 paritytab[8] =
@@ -304,43 +246,29 @@
};
#endif
-/* local function to store a value into the LQR frame */
-extern inline __u8 * store_long (register __u8 *p, register int value) {
- *p++ = (__u8) (value >> 24);
- *p++ = (__u8) (value >> 16);
- *p++ = (__u8) (value >> 8);
- *p++ = (__u8) value;
- return p;
-}
-
-/*************************************************************
- * INITIALIZATION
- *************************************************************/
-
-/* This procedure is called once and once only to define who we are to
- * the operating system and the various procedures that it may use in
- * accessing the ppp protocol.
+/*
+ * This procedure is called at initialization time to register
+ * the PPP line discipline.
*/
-
-__initfunc(static int
-ppp_first_time (void))
+static int
+ppp_first_time(void)
{
static struct tty_ldisc ppp_ldisc;
int status;
- printk (KERN_INFO
- "PPP: version %s (demand dialling)"
- "\n", szVersion);
+ printk(KERN_INFO
+ "PPP: version %s (demand dialling)"
+ "\n", szVersion);
#ifndef MODULE /* slhc module logic has its own copyright announcement */
- printk (KERN_INFO
- "TCP compression code copyright 1989 Regents of the "
- "University of California\n");
+ printk(KERN_INFO
+ "TCP compression code copyright 1989 Regents of the "
+ "University of California\n");
#endif
-/*
- * Register the tty discipline
- */
+ /*
+ * Register the tty discipline
+ */
(void) memset (&ppp_ldisc, 0, sizeof (ppp_ldisc));
ppp_ldisc.magic = TTY_LDISC_MAGIC;
ppp_ldisc.name = "ppp";
@@ -356,89 +284,20 @@
status = tty_register_ldisc (N_PPP, &ppp_ldisc);
if (status == 0)
- printk (KERN_INFO "PPP line discipline registered.\n");
+ printk(KERN_INFO "PPP line discipline registered.\n");
else
- printk (KERN_ERR "error registering line discipline: %d\n",
- status);
+ printk(KERN_ERR "error registering line discipline: %d\n",
+ status);
return status;
}
-/*************************************************************
- * INITIALIZATION
- *************************************************************/
-
-/* called when the device is actually created */
-
-static int
-ppp_init_dev (struct device *dev)
-{
- dev->hard_header_len = PPP_HDRLEN;
-
- /* device INFO */
- dev->mtu = PPP_MTU;
- dev->hard_start_xmit = ppp_dev_xmit;
- dev->open = ppp_dev_open;
- dev->stop = ppp_dev_close;
- dev->get_stats = ppp_dev_stats;
- dev->do_ioctl = ppp_dev_ioctl;
- dev->addr_len = 0;
- dev->tx_queue_len = 10;
- dev->type = ARPHRD_PPP;
-
- dev_init_buffers(dev);
-
- /* New-style flags */
- dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
-
- return 0;
-}
+#ifndef MODULE
/*
- * Local procedure to initialize the ppp structure
+ * Called at boot time if the PPP driver is compiled into the kernel.
*/
-
-static void
-ppp_init_ctrl_blk (register struct ppp *ppp)
-{
- ppp->magic = PPP_MAGIC;
- ppp->toss = 0xE0;
- ppp->escape = 0;
-
- ppp->flags = 0;
- ppp->mtu = PPP_MTU;
- ppp->mru = PPP_MRU;
-
- memset (ppp->xmit_async_map, 0, sizeof (ppp->xmit_async_map));
- ppp->xmit_async_map[0] = 0xffffffff;
- ppp->xmit_async_map[3] = 0x60000000;
- ppp->recv_async_map = 0x00000000;
-
- ppp->rbuf = NULL;
- ppp->wbuf = NULL;
- ppp->ubuf = NULL;
- ppp->cbuf = NULL;
- ppp->slcomp = NULL;
- ppp->last_xmit = jiffies - flag_time;
- ppp->last_recv = jiffies;
-
- /* clear statistics */
- memset(&ppp->stats, 0, sizeof (struct pppstat));
- memset(&ppp->estats, 0, sizeof(ppp->estats));
-
- /* PPP compression data */
- ppp->sc_xc_state =
- ppp->sc_rc_state = NULL;
-}
-
-EXPORT_SYMBOL(ppp_register_compressor);
-EXPORT_SYMBOL(ppp_unregister_compressor);
-EXPORT_SYMBOL(ppp_crc16_table);
-
-/* called at boot/load time for each ppp device defined in the kernel */
-
-#ifndef MODULE
int
-ppp_init (struct device *dev)
+ppp_init(struct device *dev)
{
static int first_time = 1;
int answer = 0;
@@ -453,1712 +312,1259 @@
}
#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.
+ * Initialize the async-specific parts of the ppp structure.
*/
-
-static struct ppp_buffer *
-ppp_alloc_buf (int size, int type)
+static void
+ppp_async_init(struct ppp *ppp)
{
- struct ppp_buffer *buf;
+ ppp->escape = 0;
+ ppp->toss = 0xE0;
+ ppp->tty_pushing = 0;
- buf = (struct ppp_buffer *) kmalloc (size + sizeof (struct ppp_buffer),
- GFP_ATOMIC);
+ memset (ppp->xmit_async_map, 0, sizeof (ppp->xmit_async_map));
+ ppp->xmit_async_map[0] = 0xffffffff;
+ ppp->xmit_async_map[3] = 0x60000000;
+ ppp->recv_async_map = 0xffffffff;
- if (buf != NULL) {
- buf->size = size - 1; /* Mask for the buffer size */
- buf->type = type;
- buf->locked = 0;
- buf->count = 0;
- buf->head = 0;
- buf->tail = 0;
- buf->fcs = PPP_INITFCS;
- buf->magic = BUFFER_MAGIC;
- }
- return (buf);
-}
+ ppp->tpkt = NULL;
+ ppp->tfcs = PPP_INITFCS;
+ ppp->optr = ppp->obuf;
+ ppp->olim = ppp->obuf;
-/*
- * Routine to release the allocated buffer.
- */
+ ppp->rpkt = NULL;
+ ppp->rfcs = PPP_INITFCS;
-static void
-ppp_free_buf (struct ppp_buffer *ptr)
-{
- if (ptr != NULL) {
- CHECK_BUF_MAGIC(ptr);
- kfree (ptr);
- }
+ ppp->tty = NULL;
+ ppp->backup_tty = NULL;
+
+ ppp->bytes_sent = 0;
+ ppp->bytes_rcvd = 0;
}
/*
- * Lock the indicated transmit buffer
+ * Clean up the async-specific parts of the ppp structure.
*/
-
-extern inline int
-lock_buffer (register struct ppp_buffer *buf)
+static void
+ppp_async_release(struct ppp *ppp)
{
- unsigned long state;
- unsigned long flags;
-/*
- * 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;
- if (state == 0)
- buf->locked = 2;
+ struct sk_buff *skb;
- restore_flags (flags);
- return (state);
+ if ((skb = ppp->rpkt) != NULL)
+ kfree_skb(skb);
+ ppp->rpkt = NULL;
+ if ((skb = ppp->tpkt) != NULL)
+ kfree_skb(skb);
+ ppp->tpkt = NULL;
}
/*
- * MTU has been changed by the IP layer. Unfortunately we are not told
- * about this, but we spot it ourselves and fix things up. We could be
- * in an upcall from the tty driver, or in an ip packet queue.
+ * TTY callback.
+ *
+ * Called when the tty discipline is switched to PPP.
*/
static int
-ppp_changedmtu (struct ppp *ppp, int new_mtu, int new_mru)
+ppp_tty_open (struct tty_struct *tty)
{
- struct device *dev;
- unsigned long flags;
+ struct ppp *ppp;
+
+ /*
+ * Allocate a ppp structure to use.
+ */
+ tty->disc_data = NULL;
+ ppp = ppp_find(current->pid);
+ if (ppp != NULL) {
+ /*
+ * If we are taking over a ppp unit which is currently
+ * connected to a loopback pty, there's not much to do.
+ */
+ CHECK_PPP(-EINVAL);
- struct ppp_buffer *new_rbuf;
- struct ppp_buffer *new_wbuf;
- struct ppp_buffer *new_cbuf;
- struct ppp_buffer *new_tbuf;
-
- struct ppp_buffer *old_rbuf;
- struct ppp_buffer *old_wbuf;
- struct ppp_buffer *old_cbuf;
- struct ppp_buffer *old_tbuf;
+ } else {
+ ppp = ppp_alloc();
+ if (ppp == NULL) {
+ printk(KERN_ERR "ppp_alloc failed\n");
+ return -ENFILE;
+ }
- int mtu, mru;
-/*
- * 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;
-
- /* RFC 1331, section 7.2 says the minimum value is 1500 bytes */
- if (mru < PPP_MRU)
- mru = PPP_MRU;
-
- mru += 10;
-
- 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_HDRLEN, BUFFER_TYPE_VJ);
-/*
- * If the buffers failed to allocate then complain and release the partial
- * allocations.
- */
- if (new_wbuf == NULL || new_tbuf == NULL ||
- new_rbuf == NULL || new_cbuf == NULL) {
- printk (KERN_ERR "ppp: failed to allocate new buffers\n");
-
- ppp_free_buf (new_wbuf);
- ppp_free_buf (new_tbuf);
- ppp_free_buf (new_rbuf);
- ppp_free_buf (new_cbuf);
- return 0;
+ /*
+ * Initialize the control block
+ */
+ ppp_generic_init(ppp);
+ ppp_async_init(ppp);
+
+ MOD_INC_USE_COUNT;
}
-/*
- * Update the pointers to the new buffer structures.
- */
- save_flags(flags);
- cli ();
- old_wbuf = ppp->wbuf;
- old_rbuf = ppp->rbuf;
- old_cbuf = ppp->cbuf;
- old_tbuf = ppp->tbuf;
-
- ppp->wbuf = new_wbuf;
- ppp->rbuf = new_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);
- dev->mem_end = (unsigned long) (dev->mem_start + mtu);
- dev->rmem_start = (unsigned long) buf_base (new_rbuf);
- dev->rmem_end = (unsigned long) (dev->rmem_start + mru);
-/*
- * Update the parameters for the new buffer sizes
- */
- ppp->toss = 0xE0; /* To ignore characters until new FLAG */
- ppp->escape = 0; /* No pending escape character */
-
- dev->mtu =
- ppp->mtu = new_mtu;
- ppp->mru = new_mru;
-
- ppp->s1buf = NULL;
- ppp->s2buf = NULL;
- ppp->xbuf = NULL;
- ppp->tty->flags &= ~(1 << TTY_DO_WRITE_WAKEUP);
- ppp->flags &= ~SC_XMIT_BUSY;
+ tty->disc_data = ppp;
+ ppp->tty = tty;
- restore_flags(flags);
-/*
- * Release old buffer pointers
- */
- ppp_free_buf (old_rbuf);
- ppp_free_buf (old_wbuf);
- ppp_free_buf (old_cbuf);
- ppp_free_buf (old_tbuf);
- return 1;
+ /*
+ * Flush any pending characters in the driver
+ */
+ if (tty->driver.flush_buffer)
+ tty->driver.flush_buffer (tty);
+
+ return ppp->line;
}
/*
- * CCP is down; free (de)compressor state if necessary.
+ * TTY callback.
+ *
+ * Called when the line discipline is changed to something
+ * else, the tty is closed, or the tty detects a hangup.
*/
static void
-ppp_ccp_closed (struct ppp *ppp)
+ppp_tty_close (struct tty_struct *tty)
{
- unsigned long flags;
+ struct ppp *ppp = tty2ppp(tty);
- 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;
+ if (ppp == NULL)
+ return;
+ tty->disc_data = NULL;
+ if (ppp->magic != PPP_MAGIC) {
+ printk(KERN_WARNING "ppp_tty_close: bogus\n");
+ return;
+ }
+ if (!ppp->inuse) {
+ printk(KERN_WARNING "ppp_tty_close: not inuse\n");
+ ppp->tty = ppp->backup_tty = 0;
+ return;
}
+ if (tty == ppp->backup_tty)
+ ppp->backup_tty = 0;
+ if (tty != ppp->tty)
+ return;
+ if (ppp->backup_tty) {
+ ppp->tty = ppp->backup_tty;
+ } else {
+ ppp->tty = 0;
+ ppp->sc_xfer = 0;
+ if (ppp->flags & SC_DEBUG)
+ printk(KERN_INFO "ppp: channel %s closing.\n",
+ ppp2dev(ppp)->name);
- if (ppp->sc_rc_state) {
- (*ppp->sc_rcomp->decomp_free) (ppp->sc_rc_state);
- ppp->sc_rc_state = NULL;
+ ppp_async_release(ppp);
+ ppp_release(ppp);
+ ppp->inuse = 0;
+ MOD_DEC_USE_COUNT;
}
}
/*
- * Called to release all of the information in the current PPP structure.
- *
- * It is called when the ppp device goes down or if it is unable to go
- * up.
+ * Read a PPP frame from the rcv_q list,
+ * waiting if necessary
*/
-
-static void
-ppp_release (struct ppp *ppp)
+static ssize_t
+ppp_tty_read(struct tty_struct *tty, struct file *file, __u8 * buf,
+ size_t nr)
{
- 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 "%s released\n", ppp->name);
-
- ppp_ccp_closed (ppp);
-
- /* Ensure that the pppd process is not hanging on poll() */
- wake_up_interruptible (&ppp->read_wait);
- wake_up_interruptible (&ppp->write_wait);
-
- if (tty != NULL && tty->disc_data == ppp)
- tty->disc_data = NULL; /* Break the tty->ppp link */
-
- ppp_free_buf (ppp->rbuf);
- ppp_free_buf (ppp->wbuf);
- ppp_free_buf (ppp->cbuf);
- ppp_free_buf (ppp->ubuf);
- ppp_free_buf (ppp->tbuf);
-
- ppp->rbuf =
- ppp->wbuf =
- ppp->cbuf =
- ppp->tbuf =
- ppp->xbuf =
- ppp->s1buf =
- ppp->s2buf =
- ppp->ubuf = NULL;
-
- if (ppp->slcomp) {
- slhc_free (ppp->slcomp);
- ppp->slcomp = NULL;
- }
-
- ppp->inuse = 0;
- ppp->tty = NULL;
- ppp->backup_tty = NULL;
-}
+ struct ppp *ppp = tty2ppp (tty);
+ struct sk_buff *skb;
+ ssize_t len, err;
-/*
- * TTY callback.
- *
- * Called when the line discipline is changed to something
- * else, the tty is closed, or the tty detects a hangup.
- */
+ /*
+ * Validate the pointers
+ */
+ if (!ppp)
+ return -EIO;
+ CHECK_PPP(-ENXIO);
-static void
-ppp_tty_close (struct tty_struct *tty)
-{
- struct ppp *ppp = tty2ppp (tty);
+ /*
+ * Before we attempt to write the frame to the user, ensure that the
+ * user has access to the pages for the total buffer length.
+ */
+ err = verify_area(VERIFY_WRITE, buf, nr);
+ if (err != 0)
+ return (err);
- if (ppp != NULL) {
- if (ppp->magic != PPP_MAGIC) {
- if (ppp->flags & SC_DEBUG)
- printk (KERN_WARNING
- "ppp: trying to close unopened tty!\n");
- return;
- }
- CHECK_PPP_VOID();
- tty->disc_data = NULL;
- if (tty == ppp->backup_tty)
- ppp->backup_tty = 0;
- if (tty != ppp->tty)
- return;
- if (ppp->backup_tty) {
- ppp->tty = ppp->backup_tty;
- } else {
- ppp->sc_xfer = 0;
- if (ppp->flags & SC_DEBUG)
- printk (KERN_INFO "ppp: channel %s closing.\n",
- ppp2dev(ppp)->name);
- ppp_release (ppp);
- MOD_DEC_USE_COUNT;
- }
- }
-}
+ /*
+ * Wait for a frame to arrive if necessary.
+ * We increment the module use count so that the module
+ * can't go away while we're sleeping.
+ */
+ MOD_INC_USE_COUNT;
+ skb = NULL;
+ for (;;) {
+ ppp = tty2ppp(tty);
+ err = 0;
+ if (!ppp || ppp->magic != PPP_MAGIC || !ppp->inuse
+ || tty != ppp->tty)
+ break;
-/*
- * TTY callback.
- *
- * Called when the tty discipline is switched to PPP.
- */
+ skb = skb_dequeue(&ppp->rcv_q);
+ if (skb != 0)
+ break;
-static int
-ppp_tty_open (struct tty_struct *tty)
-{
- struct ppp *ppp = tty2ppp (tty);
- int indx;
-/*
- * There should not be an existing table for this slot.
- */
- if (ppp) {
- printk (KERN_ERR
- "ppp_tty_open: gack! tty already associated to %s!\n",
- ppp->magic == PPP_MAGIC ? ppp2dev(ppp)->name
- : "unknown");
- return -EEXIST;
- }
-/*
- * Allocate the structure from the system
- */
- ppp = ppp_find(current->pid);
- if (ppp != NULL) {
/*
- * If we are taking over a ppp unit which is currently
- * connected to a loopback pty, there's not much to do.
+ * If no frame is available, return -EAGAIN or wait.
*/
- CHECK_PPP(-EINVAL);
- tty->disc_data = ppp;
- ppp->tty = tty;
+ err = -EAGAIN;
+ if (file->f_flags & O_NONBLOCK)
+ break;
- } else {
- ppp = ppp_alloc();
- if (ppp == NULL) {
- printk (KERN_ERR "ppp_alloc failed\n");
- return -ENFILE;
- }
-/*
- * Initialize the control block
- */
- ppp_init_ctrl_blk (ppp);
- tty->disc_data = ppp;
- ppp->tty = tty;
-/*
- * Allocate space for the default VJ header compression slots
- */
- ppp->slcomp = slhc_init (16, 16);
- if (ppp->slcomp == NULL) {
- printk (KERN_ERR "ppp_tty_open: "
- "no space for compression buffers!\n");
- ppp_release (ppp);
- return -ENOMEM;
- }
-/*
- * Allocate space for the MTU and MRU buffers
- */
- if (ppp_changedmtu (ppp, ppp2dev(ppp)->mtu, ppp->mru) == 0) {
- ppp_release (ppp);
- return -ENOMEM;
- }
-/*
- * Allocate space for a user level buffer
- */
- ppp->ubuf = ppp_alloc_buf (RBUFSIZE, BUFFER_TYPE_TTY_RD);
- if (ppp->ubuf == NULL) {
- printk (KERN_ERR "ppp_tty_open: "
- "no space for user receive buffer\n");
- ppp_release (ppp);
- return -ENOMEM;
- }
+ current->timeout = 0;
+ interruptible_sleep_on(&ppp->read_wait);
+ err = -EINTR;
+ if (signal_pending(current))
+ break;
+ }
+ MOD_DEC_USE_COUNT;
+ if (skb == 0)
+ return err;
+ /*
+ * Ensure that the frame will fit within the caller's buffer.
+ * If not, just discard the frame.
+ */
+ len = skb->len;
+ if (len > nr) {
if (ppp->flags & SC_DEBUG)
- printk (KERN_INFO "ppp: channel %s open\n",
- ppp2dev(ppp)->name);
-
- for (indx = 0; indx < NUM_NP; ++indx)
- ppp->sc_npmode[indx] = NPMODE_PASS;
-
- MOD_INC_USE_COUNT;
+ printk(KERN_DEBUG
+ "ppp: read of %lu bytes too small for %ld "
+ "frame\n", (unsigned long) nr, (long) len);
+ ppp->stats.ppp_ierrors++;
+ err = -EOVERFLOW;
+ goto out;
}
-/*
- * Flush any pending characters in the driver and discipline.
- */
- if (tty->ldisc.flush_buffer)
- tty->ldisc.flush_buffer (tty);
- if (tty->driver.flush_buffer)
- tty->driver.flush_buffer (tty);
- return (ppp->line);
-}
-
-/*
- * Local function to send the next portion of the buffer.
- *
- * Called by the tty driver's tty_wakeup function should it be entered
- * because the partial buffer was transmitted.
- *
- * Called by kick_tty to send the initial portion of the buffer.
- *
- * Completion processing of the buffer transmission is handled here.
- */
-
-static void
-ppp_tty_wakeup_code (struct ppp *ppp, struct tty_struct *tty,
- struct ppp_buffer *xbuf)
-{
- register int count, actual;
- unsigned long flags;
+ /*
+ * Copy the received data from the buffer to the caller's area.
+ */
+ err = len;
+ if (copy_to_user(buf, skb->data, len))
+ err = -EFAULT;
- 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) {
- restore_flags(flags);
- return;
- }
- ppp->flags |= SC_XMIT_BUSY;
- restore_flags(flags);
-/*
- * Send the next block of data to the modem
- */
- count = xbuf->count - xbuf->tail;
- actual = tty->driver.write (tty, 0,
- buf_base (xbuf) + xbuf->tail, count);
-/*
- * Terminate transmission of any block which may have an error.
- * This could occur should the carrier drop.
- */
- if (actual < 0) {
- ppp->stats.ppp_oerrors++;
- actual = count;
- } else
- ppp->bytes_sent += actual;
-/*
- * If the buffer has been transmitted then clear the indicators.
- */
- xbuf->tail += actual;
- if (actual == count) {
- xbuf = NULL;
- ppp->flags &= ~SC_XMIT_BUSY;
-/*
- * Complete the transmission on the current buffer.
- */
- xbuf = ppp->xbuf;
- if (xbuf != NULL) {
- tty->flags &= ~(1 << TTY_DO_WRITE_WAKEUP);
- xbuf->locked = 0;
- ppp->xbuf = NULL;
-/*
- * If the completed buffer came from the device write, then complete the
- * transmission block.
- */
- ppp2dev (ppp)->tbusy = 0;
- mark_bh (NET_BH);
-/*
- * Wake up the transmission queue for all completion events.
- */
- wake_up_interruptible (&ppp->write_wait);
-/*
- * Look at the priorities. Choose a daemon write over the device driver.
- */
- save_flags(flags);
- cli();
- xbuf = ppp->s1buf;
- ppp->s1buf = NULL;
- if (xbuf == NULL) {
- xbuf = ppp->s2buf;
- ppp->s2buf = NULL;
- }
-/*
- * 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);
+out:
+ kfree_skb(skb);
+ return err;
}
/*
- * This function is called by the tty driver when the transmit buffer has
- * additional space. It is used by the ppp code to continue to transmit
- * the current buffer should the buffer have been partially sent.
- *
- * In addition, it is used to send the first part of the buffer since the
- * logic and the inter-locking would be identical.
+ * Writing to a tty in ppp line discipline sends a PPP frame.
+ * Used by pppd to send control packets (LCP, etc.).
*/
-
-static void
-ppp_tty_wakeup (struct tty_struct *tty)
+static ssize_t
+ppp_tty_write(struct tty_struct *tty, struct file *file, const __u8 * data,
+ size_t count)
{
- struct ppp_buffer *xbuf;
struct ppp *ppp = tty2ppp (tty);
+ __u8 *new_data;
+ struct sk_buff *skb;
+ /*
+ * Verify the pointers.
+ */
if (!ppp)
- return;
- CHECK_PPP_VOID();
+ return -EIO;
- if (tty != ppp->tty) {
- tty->flags &= ~(1 << TTY_DO_WRITE_WAKEUP);
- return;
- }
-/*
- * Ensure that there is a transmission pending. Clear the re-entry flag if
- * there is no pending buffer. Otherwise, send the buffer.
- */
- xbuf = ppp->xbuf;
- if (xbuf == NULL)
- tty->flags &= ~(1 << TTY_DO_WRITE_WAKEUP);
- else
- ppp_tty_wakeup_code (ppp, tty, xbuf);
-}
+ if (ppp->magic != PPP_MAGIC)
+ return -EIO;
-/*
- * This function is called to transmit a buffer to the remote. The buffer
- * is placed on the pending queue if there is presently a buffer being
- * sent or it is transmitted with the aid of ppp_tty_wakeup.
- */
+ CHECK_PPP(-ENXIO);
-static void
-ppp_kick_tty (struct ppp *ppp, struct ppp_buffer *xbuf)
-{
- unsigned long flags;
+ /*
+ * Ensure that the caller does not wish to send too much.
+ */
+ if (count > PPP_MTU + PPP_HDRLEN) {
+ if (ppp->flags & SC_DEBUG)
+ printk(KERN_WARNING
+ "ppp_tty_write: truncating user packet "
+ "from %lu to mtu %d\n", (unsigned long) count,
+ PPP_MTU + PPP_HDRLEN);
+ count = PPP_MTU + PPP_HDRLEN;
+ }
- CHECK_PPP_VOID();
- CHECK_BUF_MAGIC(xbuf);
-/*
- * Hold interrupts.
- */
- save_flags (flags);
- cli ();
-/*
- * Control the flags which are best performed with the interrupts masked.
- */
- xbuf->locked = 1;
- xbuf->tail = 0;
-/*
- * If the transmitter is busy then place the buffer on the appropriate
- * priority queue.
- */
- if (ppp->xbuf != NULL) {
- if (xbuf->type == BUFFER_TYPE_TTY_WR)
- ppp->s1buf = xbuf;
- else
- ppp->s2buf = xbuf;
- restore_flags (flags);
- return;
+ /*
+ * Allocate a buffer for the data and fetch it from the user space.
+ */
+ skb = alloc_skb(count, GFP_KERNEL);
+ if (skb == NULL) {
+ printk(KERN_ERR "ppp_tty_write: no memory\n");
+ return 0;
}
-/*
- * If the transmitter is not busy then this is the highest priority frame
- */
- ppp->flags &= ~SC_XMIT_BUSY;
- ppp->tty->flags |= (1 << TTY_DO_WRITE_WAKEUP);
- ppp->xbuf = xbuf;
- restore_flags (flags);
-/*
- * Do the "tty wakeup_code" to actually send this buffer.
- */
- ppp_tty_wakeup_code (ppp, ppp2tty (ppp), xbuf);
-}
+ new_data = skb_put(skb, count);
-/*************************************************************
- * TTY INPUT
- * The following functions handle input that arrives from
- * the TTY. It recognizes PPP frames and either hands them
- * to the network layer or queues them for delivery to a
- * user process reading this TTY.
- *************************************************************/
+ /*
+ * Retrieve the user's buffer
+ */
+ if (copy_from_user(new_data, data, count)) {
+ kfree_skb(skb);
+ return -EFAULT;
+ }
-/*
- * Callback function from tty driver. Return the amount of space left
- * in the receiver's buffer to decide if remote transmitter is to be
- * throttled.
- */
+ /*
+ * Send the frame
+ */
+ ppp_send_ctrl(ppp, skb);
-static int
-ppp_tty_room (struct tty_struct *tty)
-{
- return 65536; /* We can handle an infinite amount of data. :-) */
+ return (ssize_t) count;
}
/*
- * Callback function when data is available at the tty driver.
+ * Process the IOCTL call for the tty device.
+ * Only the ioctls that relate to using ppp on async serial lines
+ * are processed here; the rest are handled by ppp_ioctl.
*/
-static void
-ppp_tty_receive (struct tty_struct *tty, const __u8 * data,
- char *flags, int count)
+static int
+ppp_tty_ioctl (struct tty_struct *tty, struct file * file,
+ unsigned int param2, unsigned long param3)
{
- register struct ppp *ppp = tty2ppp (tty);
- register struct ppp_buffer *buf = NULL;
- __u8 chr;
+ struct ppp *ppp = tty2ppp (tty);
+ register int temp_i = 0;
+ int error = -EFAULT;
- if (ppp != 0)
- CHECK_PPP_VOID();
/*
- * This can happen if stuff comes in on the backup tty.
+ * Verify the status of the PPP device.
*/
- if (ppp == 0 || tty != ppp->tty)
- return;
-/*
- * Fetch the pointer to the buffer. Be careful about race conditions.
- */
- buf = ppp->rbuf;
- if (buf == NULL)
- return;
-/*
- * Verify the table pointer and ensure that the line is
- * still in PPP discipline.
- */
- if (ppp->magic != PPP_MAGIC) {
- if (ppp->flags & SC_DEBUG)
- printk (KERN_DEBUG
- "PPP: tty_receive called but couldn't find "
- "PPP struct.\n");
- return;
- }
- CHECK_PPP_VOID ();
-/*
- * Print the buffer if desired
- */
- if (ppp->flags & SC_LOG_RAWIN)
- ppp_print_buffer ("receive buffer", data, count);
+ if (!ppp || ppp->magic != PPP_MAGIC || !ppp->inuse)
+ return -ENXIO;
-/*
- * Collect the character and error condition for the character. Set the toss
- * flag for the first character error.
- */
- while (count-- > 0) {
- ppp->bytes_rcvd++;
- chr = *data++;
- if (flags) {
- if (*flags && ppp->toss == 0) {
- ppp->toss = *flags;
- switch (ppp->toss) {
- case TTY_OVERRUN:
- ++ppp->estats.rx_fifo_errors;
- break;
- case TTY_FRAME:
- case TTY_BREAK:
- ++ppp->estats.rx_frame_errors;
- break;
- }
- }
- ++flags;
- }
+ /*
+ * The user must have an euid of root to do these requests.
+ */
+ if (!capable(CAP_NET_ADMIN))
+ return -EPERM;
-/*
- * Set the flags for d7 being 0/1 and parity being even/odd so that
- * the normal processing would have all flags set at the end of the
- * session. A missing flag bit indicates an error condition.
- */
+ switch (param2) {
+ case PPPIOCGASYNCMAP:
+ /*
+ * Retrieve the transmit async map
+ */
+ if (put_user(ppp->xmit_async_map[0], (int *) param3))
+ break;
+ error = 0;
+ break;
+
+ case PPPIOCSASYNCMAP:
+ /*
+ * Set the transmit async map
+ */
+ if (get_user(temp_i, (int *) param3))
+ 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]);
+ error = 0;
+ break;
-#ifdef CHECK_CHARACTERS
- if (chr & 0x80)
- ppp->flags |= SC_RCV_B7_1;
- else
- ppp->flags |= SC_RCV_B7_0;
+ case PPPIOCSRASYNCMAP:
+ /*
+ * Set the receive async map
+ */
+ if (get_user(temp_i, (int *) param3))
+ 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);
+ error = 0;
+ break;
- if (paritytab[chr >> 5] & (1 << (chr & 0x1F)))
- ppp->flags |= SC_RCV_ODDP;
- else
- ppp->flags |= SC_RCV_EVNP;
-#endif
-/*
- * Branch on the character.
- */
- switch (chr) {
-/*
- * FLAG. This is the end of the block. If the block terminated by ESC FLAG,
- * then the block is to be ignored. In addition, characters before the very
- * first FLAG are also tossed by this procedure.
- */
- case PPP_FLAG: /* PPP_FLAG: end of frame */
- ppp->stats.ppp_ibytes += ppp->rbuf->count;
- if (ppp->escape)
- ppp->toss |= 0x80;
-/*
- * Process frames which are not to be ignored. If the processing failed,
- * then clean up the VJ tables.
- */
- if (ppp_doframe (ppp) == 0) {
- ++ppp->stats.ppp_ierrors;
- slhc_toss (ppp->slcomp);
- }
-/*
- * Reset all indicators for the new frame to follow.
- */
- buf->count = 0;
- buf->fcs = PPP_INITFCS;
- ppp->escape = 0;
- ppp->toss = 0;
+ case PPPIOCGXASYNCMAP:
+ /*
+ * Get the map of characters to be escaped on transmission.
+ */
+ if (copy_to_user((void *) param3, ppp->xmit_async_map,
+ sizeof (ppp->xmit_async_map)))
break;
-/*
- * All other characters in the data come here. If the character is in the
- * receive mask then ignore the character.
- */
- default:
- /* If we're tossing, look no further. */
- if (ppp->toss != 0)
- break;
+ error = 0;
+ break;
- /* If this is a control char to be ignored, do so */
- if (in_rmap (ppp, chr))
- break;
+ case PPPIOCSXASYNCMAP:
+ /*
+ * Set the map of characters to be escaped on transmission.
+ */
+ {
+ __u32 temp_tbl[8];
- /*
- * Modify the next character if preceded by escape.
- * The escape character (0x7d) could be an escaped
- * 0x5d, if it follows an escape :-)
- */
- if (ppp->escape) {
- chr ^= PPP_TRANS;
- ppp->escape = 0;
- } else if (chr == PPP_ESCAPE) {
- ppp->escape = PPP_TRANS;
+ if (copy_from_user(temp_tbl, (void *) param3,
+ sizeof (temp_tbl)))
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.
- */
- if (buf->count < buf->size) {
- buf_base (buf)[buf->count++] = chr;
- buf->fcs = PPP_FCS (buf->fcs, chr);
- break;
- }
-/*
- * The peer sent too much data. Set the flags to discard the current frame
- * and wait for the re-synchronization FLAG to be sent.
- */
- ++ppp->estats.rx_length_errors;
- ppp->toss |= 0xC0;
- break;
- }
- }
-}
+ temp_tbl[1] = 0x00000000;
+ temp_tbl[2] &= ~0x40000000;
+ temp_tbl[3] |= 0x60000000;
-/* on entry, a received frame is in ppp->rbuf.bufr
- check it and dispose as appropriate */
+ memcpy(ppp->xmit_async_map, temp_tbl,
+ sizeof (ppp->xmit_async_map));
-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;
+ if (ppp->flags & SC_DEBUG)
+ printk(KERN_INFO
+ "ppp_tty_ioctl: set xasyncmap\n");
+ error = 0;
+ }
+ break;
- CHECK_PPP(0);
- CHECK_BUF_MAGIC(ppp->rbuf);
+ case PPPIOCXFERUNIT:
+ /*
+ * Set up this PPP unit to be used next time this
+ * process sets a tty to PPP line discipline.
+ */
+ ppp->backup_tty = tty;
+ ppp->sc_xfer = current->pid;
+ error = 0;
+ break;
-/*
- * 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) {
- 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 TCGETS:
+ case TCGETA:
+ /*
+ * Allow users to read, but not set, the serial port parameters
+ */
+ error = n_tty_ioctl (tty, file, param2, param3);
+ break;
- case DECOMP_ERROR:
- ppp->flags |= SC_DC_ERROR;
- break;
+ case FIONREAD:
+ /*
+ * Returns how many bytes are available for a read().
+ */
+ {
+ unsigned long flags;
+ struct sk_buff *skb;
+ int count = 0;
- case DECOMP_FATALERROR:
- ppp->flags |= SC_DC_FERROR;
- printk(KERN_ERR "ppp: fatal decomp error\n");
+ save_flags(flags);
+ cli();
+ skb = skb_peek(&ppp->rcv_q);
+ if (skb != 0)
+ count = skb->len;
+ restore_flags(flags);
+ if (put_user(count, (int *) param3))
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);
+ error = 0;
}
- } else if (proto == PPP_COMP && (ppp->flags & SC_DEBUG)) {
- printk(KERN_DEBUG "ppp: frame not decompressed: "
- "flags=%x, count=%d, sc_rc_state=%p\n",
- ppp->flags, count, ppp->sc_rc_state);
+ break;
+
+ default:
+ /*
+ * All other ioctl() events will come here.
+ */
+ error = ppp_ioctl(ppp, param2, param3);
+ break;
}
+ return error;
+}
+
/*
- * Process the uncompressed frame.
+ * TTY callback.
+ *
+ * Process the poll() statement for the PPP device.
*/
- ppp_doframe_lower (ppp, data, count);
- return 1;
-}
-static void ppp_doframe_lower (struct ppp *ppp, __u8 *data, int count)
+static unsigned int
+ppp_tty_poll(struct tty_struct *tty, struct file *filp, poll_table * wait)
{
- __u16 proto = PPP_PROTOCOL (data);
- ppp_proto_type *proto_ptr;
+ struct ppp *ppp = tty2ppp(tty);
+ unsigned int mask = 0;
- 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;
-}
+ if (ppp && ppp->magic == PPP_MAGIC && tty == ppp->tty) {
+ CHECK_PPP(0);
-/*
- * Put the input frame into the networking system for the indicated protocol
- */
+ poll_wait(filp, &ppp->read_wait, wait);
-static int
-ppp_rcv_rx (struct ppp *ppp, __u16 proto, __u8 * data, int count)
-{
- sk_buff *skb = dev_alloc_skb (count);
-/*
- * Generate a skb buffer for the new frame.
- */
- if (skb == NULL) {
- if (ppp->flags & SC_DEBUG)
- printk (KERN_ERR
- "ppp_do_ip: packet dropped on %s (no memory)!\n",
- ppp2dev (ppp)->name);
- return 0;
+ if (skb_peek(&ppp->rcv_q) != NULL)
+ mask |= POLLIN | POLLRDNORM;
+ if (tty->flags & (1 << TTY_OTHER_CLOSED)
+ || tty_hung_up_p(filp))
+ mask |= POLLHUP;
+ mask |= POLLOUT | POLLWRNORM;
}
-/*
- * Move the received data from the input buffer to the skb buffer.
- */
- skb->dev = ppp2dev (ppp); /* We are the device */
- skb->protocol = proto;
- skb->mac.raw = skb_data(skb);
- memcpy (skb_put(skb,count), data, count); /* move data */
-/*
- * Tag the frame and kick it to the proper receive routine
- */
- ppp->last_recv = jiffies;
- netif_rx (skb);
- return 1;
+ return mask;
}
/*
- * Process the receipt of an IP frame
+ * This function is called by the tty driver when the transmit buffer has
+ * additional space. It is used by the ppp code to continue to transmit
+ * the current buffer should the buffer have been partially sent.
*/
-
-static int
-rcv_proto_ip (struct ppp *ppp, __u16 proto, __u8 * data, int count)
+static void
+ppp_tty_wakeup (struct tty_struct *tty)
{
- 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);
- return 0;
+ struct ppp *ppp = tty2ppp (tty);
+
+ tty->flags &= ~(1 << TTY_DO_WRITE_WAKEUP);
+ if (!ppp)
+ return;
+ CHECK_PPP_VOID();
+ if (tty != ppp->tty)
+ return;
+
+ if (ppp_tty_push(ppp))
+ ppp_output_wakeup(ppp);
}
/*
- * Process the receipt of an IPX frame
+ * Send a packet to the peer over an async tty line.
+ * Returns -1 iff the packet could not be accepted at present,
+ * 0 if the packet was accepted but we can't accept another yet, or
+ * 1 if we can accept another packet immediately.
+ * If this procedure returns 0, ppp_output_wakeup will be called
+ * exactly once.
*/
-
static int
-rcv_proto_ipx (struct ppp *ppp, __u16 proto, __u8 * data, int count)
+ppp_async_send(struct ppp *ppp, struct sk_buff *skb)
{
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;
+
+ ppp_tty_push(ppp);
+
+ if (ppp->tpkt != NULL)
+ return -1;
+ ppp->tpkt = skb;
+ ppp->tpkt_pos = 0;
+
+ return ppp_tty_push(ppp);
}
/*
- * Process the receipt of an VJ Compressed frame
+ * Push as much data as possible out to the tty.
+ * Returns 1 if we finished encoding the current frame, 0 otherwise.
*/
-
static int
-rcv_proto_vjc_comp (struct ppp *ppp, __u16 proto,
- __u8 *data, int count)
+ppp_tty_push(struct ppp *ppp)
{
+ int avail, sent, done = 0;
+ struct tty_struct *tty = ppp2tty(ppp);
+
CHECK_PPP(0);
- if ((ppp->flags & SC_REJ_COMP_TCP) == 0) {
- int new_count = slhc_uncompress (ppp->slcomp, data, count);
- if (new_count >= 0) {
- return rcv_proto_ip (ppp, PPP_IP, data, new_count);
+ if (ppp->tty_pushing)
+ return 0;
+ if (tty == NULL || tty->disc_data != (void *) ppp)
+ goto flush;
+ while (ppp->optr < ppp->olim || ppp->tpkt != 0) {
+ ppp->tty_pushing = 1;
+ avail = ppp->olim - ppp->optr;
+ if (avail > 0) {
+ tty->flags |= (1 << TTY_DO_WRITE_WAKEUP);
+ sent = tty->driver.write(tty, 0, ppp->optr, avail);
+ if (sent < 0)
+ goto flush; /* error, e.g. loss of CD */
+ ppp->stats.ppp_obytes += sent;
+ ppp->optr += sent;
+ if (sent < avail) {
+ ppp->tty_pushing = 0;
+ return done;
+ }
}
- if (ppp->flags & SC_DEBUG)
- printk (KERN_NOTICE
- "ppp: error in VJ decompression\n");
+ if (ppp->tpkt != 0)
+ done = ppp_async_encode(ppp);
+ ppp->tty_pushing = 0;
}
- return 0;
+ return done;
+
+flush:
+ ppp->tty_pushing = 1;
+ ppp->stats.ppp_oerrors++;
+ if (ppp->tpkt != 0) {
+ kfree_skb(ppp->tpkt);
+ ppp->tpkt = 0;
+ done = 1;
+ }
+ ppp->optr = ppp->olim;
+ ppp->tty_pushing = 0;
+ return done;
}
/*
- * Process the receipt of an VJ Un-compressed frame
+ * Procedure to encode the data for async serial transmission.
+ * Does octet stuffing (escaping) and address/control
+ * and protocol compression.
+ * Assumes ppp->opkt != 0 on entry.
+ * Returns 1 if we finished the current frame, 0 otherwise.
*/
-
static int
-rcv_proto_vjc_uncomp (struct ppp *ppp, __u16 proto,
- __u8 *data, int count)
+ppp_async_encode(struct ppp *ppp)
{
+ int fcs, i, count, c;
+ unsigned char *buf, *buflim;
+ unsigned char *data;
+ int islcp;
+
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);
+
+ buf = ppp->obuf;
+ ppp->olim = buf;
+ ppp->optr = buf;
+ i = ppp->tpkt_pos;
+ data = ppp->tpkt->data;
+ count = ppp->tpkt->len;
+ fcs = ppp->tfcs;
+
+ /*
+ * LCP packets with code values between 1 (configure-reqest)
+ * and 7 (code-reject) must be sent as though no options
+ * had been negotiated.
+ */
+ islcp = PPP_PROTOCOL(data) == PPP_LCP
+ && 1 <= data[PPP_HDRLEN] && data[PPP_HDRLEN] <= 7;
+
+ if (i == 0) {
+ /*
+ * Start of a new packet - insert the leading FLAG
+ * character if necessary.
+ */
+ if (islcp || flag_time == 0
+ || jiffies - ppp->last_xmit >= flag_time)
+ *buf++ = PPP_FLAG;
+ /* only reset idle time for data packets */
+ if (PPP_PROTOCOL(data) < 0x8000)
+ ppp->last_xmit = jiffies;
+ fcs = PPP_INITFCS;
+ ++ppp->stats.ppp_opackets;
+ ppp->stats.ppp_ooctects += count;
+
+ /*
+ * Do address/control compression
+ */
+ if ((ppp->flags & SC_COMP_AC) != 0 && !islcp
+ && PPP_ADDRESS(data) == PPP_ALLSTATIONS
+ && PPP_CONTROL(data) == PPP_UI)
+ i += 2;
+ }
+
+ /*
+ * Once we put in the last byte, we need to put in the FCS
+ * and closing flag, so make sure there is at least 7 bytes
+ * of free space in the output buffer.
+ */
+ buflim = buf + OBUFSIZE - 6;
+ while (i < count && buf < buflim) {
+ c = data[i++];
+ if (i == 3 && c == 0 && (ppp->flags & SC_COMP_PROT))
+ continue; /* compress protocol field */
+ fcs = PPP_FCS(fcs, c);
+ if (in_xmap(ppp, c) || (islcp && c < 0x20)) {
+ *buf++ = PPP_ESCAPE;
+ c ^= 0x20;
}
- if (ppp->flags & SC_DEBUG)
- printk (KERN_NOTICE
- "ppp: error in VJ memorizing\n");
+ *buf++ = c;
+ }
+
+ if (i == count) {
+ /*
+ * We have finished the packet. Add the FCS and flag.
+ */
+ fcs = ~fcs;
+ c = fcs & 0xff;
+ if (in_xmap(ppp, c) || (islcp && c < 0x20)) {
+ *buf++ = PPP_ESCAPE;
+ c ^= 0x20;
+ }
+ *buf++ = c;
+ c = (fcs >> 8) & 0xff;
+ if (in_xmap(ppp, c) || (islcp && c < 0x20)) {
+ *buf++ = PPP_ESCAPE;
+ c ^= 0x20;
+ }
+ *buf++ = c;
+ *buf++ = PPP_FLAG;
+ ppp->olim = buf;
+
+ kfree_skb(ppp->tpkt);
+ ppp->tpkt = 0;
+ return 1;
}
+
+ /*
+ * Remember where we are up to in this packet.
+ */
+ ppp->olim = buf;
+ ppp->tpkt_pos = i;
+ ppp->tfcs = fcs;
return 0;
}
/*
- * Receive all unclassified protocols.
+ * Callback function from tty driver. Return the amount of space left
+ * in the receiver's buffer to decide if remote transmitter is to be
+ * throttled.
*/
-
static int
-rcv_proto_unknown (struct ppp *ppp, __u16 proto,
- __u8 *data, int len)
+ppp_tty_room (struct tty_struct *tty)
{
- int totlen;
- register int current_idx;
-
-#define PUTC(c) \
-{ \
- buf_base (ppp->ubuf) [current_idx++] = (__u8) (c); \
- current_idx &= ppp->ubuf->size; \
- if (current_idx == ppp->ubuf->tail) \
- goto failure; \
+ return 65536; /* We can handle an infinite amount of data. :-) */
}
- CHECK_PPP(0);
-/*
- * The total length includes the protocol data.
- * Lock the user information buffer.
- */
- if (test_and_set_bit (0, &ppp->ubuf->locked)) {
- if (ppp->flags & SC_DEBUG)
- printk (KERN_DEBUG
- "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
+ * Callback function when data is available at the tty driver.
*/
- totlen = len + 2;
- PUTC (totlen >> 8);
- PUTC (totlen);
+static void
+ppp_tty_receive (struct tty_struct *tty, const __u8 * data,
+ char *flags, int count)
+{
+ register struct ppp *ppp = tty2ppp (tty);
+ struct sk_buff *skb;
+ int chr, flg;
+ unsigned char *p;
- PUTC (proto >> 8);
- PUTC (proto);
+ if (ppp != 0)
+ CHECK_PPP_VOID();
+ /*
+ * This can happen if stuff comes in on the backup tty.
+ */
+ if (ppp == 0 || tty != ppp->tty)
+ return;
+ /*
+ * Verify the table pointer and ensure that the line is
+ * still in PPP discipline.
+ */
+ if (ppp->magic != PPP_MAGIC) {
+ if (ppp->flags & SC_DEBUG)
+ printk(KERN_DEBUG
+ "PPP: tty_receive called but couldn't find "
+ "PPP struct.\n");
+ return;
+ }
+ /*
+ * Print the buffer if desired
+ */
+ if (ppp->flags & SC_LOG_RAWIN)
+ ppp_print_buffer ("receive buffer", data, count);
- totlen -= 2;
- while (totlen-- > 0) {
- PUTC (*data++);
+ ppp->stats.ppp_ibytes += count;
+ skb = ppp->rpkt;
+ while (count-- > 0) {
+ /*
+ * Collect the character and error condition for the character.
+ * Set the toss flag for the first character error.
+ */
+ chr = *data++;
+ if (flags) {
+ flg = *flags++;
+ if (flg) {
+ if (ppp->toss == 0)
+ ppp->toss = flg;
+ switch (flg) {
+ case TTY_OVERRUN:
+ ++ppp->estats.rx_fifo_errors;
+ break;
+ case TTY_FRAME:
+ case TTY_BREAK:
+ ++ppp->estats.rx_frame_errors;
+ break;
+ }
+ continue;
+ }
}
-#undef PUTC
-/*
- * The frame is complete. Update the head pointer and wakeup the pppd
- * process.
- */
- ppp->ubuf->head = current_idx;
- clear_bit (0, &ppp->ubuf->locked);
- wake_up_interruptible (&ppp->read_wait);
- if (ppp->tty->fasync != NULL)
- kill_fasync (ppp->tty->fasync, SIGIO);
+ /*
+ * Set the flags for d7 being 0/1 and parity being
+ * even/odd so that the normal processing would have
+ * all flags set at the end of the session. A
+ * missing flag bit indicates an error condition.
+ */
- return 1;
-/*
- * The buffer is full. Unlock the header
- */
-failure:
- clear_bit (0, &ppp->ubuf->locked);
- if (ppp->flags & SC_DEBUG)
- printk (KERN_DEBUG
- "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: rcv_proto_unknown: dropping packet\n");
- return 0;
-}
+#ifdef CHECK_CHARACTERS
+ if (chr & 0x80)
+ ppp->flags |= SC_RCV_B7_1;
+ else
+ ppp->flags |= SC_RCV_B7_0;
-/*
- * Handle a CCP packet.
- *
- * The CCP packet is passed along to the pppd process just like any
- * other PPP frame. The difference is that some processing needs to be
- * immediate or the compressors will become confused on the peer.
- */
+ if (paritytab[chr >> 5] & (1 << (chr & 0x1F)))
+ ppp->flags |= SC_RCV_ODDP;
+ else
+ ppp->flags |= SC_RCV_EVNP;
+#endif
-static void ppp_proto_ccp (struct ppp *ppp, __u8 *dp, int len, int rcvd)
-{
- int slen = CCP_LENGTH(dp);
- __u8 *opt = dp + CCP_HDRLEN;
- int opt_len = slen - CCP_HDRLEN;
- unsigned long flags;
+ if (chr == PPP_FLAG) {
+ /*
+ * FLAG. This is the end of the block. If the block
+ * ends with ESC FLAG, then the block is to be ignored.
+ */
+ if (ppp->escape)
+ ppp->toss |= 0x80;
+ /*
+ * Process the frame if it was received correctly.
+ * If there was an error, let the VJ decompressor know.
+ * There are 4 cases here:
+ * skb != NULL, toss != 0: error in frame
+ * skb != NULL, toss == 0: frame ok
+ * skb == NULL, toss != 0: very first frame,
+ * error on 1st char, or alloc_skb failed
+ * skb == NULL, toss == 0: empty frame (~~)
+ */
+ if (ppp->toss || !ppp_receive_frame(ppp, skb)) {
+ if (ppp->toss && (ppp->flags & SC_DEBUG))
+ printk(KERN_DEBUG
+ "ppp: tossing frame (%x)\n",
+ ppp->toss);
+ if (skb != NULL)
+ kfree_skb(skb);
+ if (!(ppp->toss == 0xE0 || ppp->toss == 0x80))
+ ++ppp->stats.ppp_ierrors;
+ ppp_receive_error(ppp);
+ }
+ /*
+ * Reset for the next frame.
+ */
+ skb = NULL;
+ ppp->rfcs = PPP_INITFCS;
+ ppp->escape = 0;
+ ppp->toss = 0;
+ continue;
+ }
- if (slen > len)
- return;
+ /* If we're tossing, look no further. */
+ if (ppp->toss != 0)
+ continue;
- save_flags(flags);
- switch (CCP_CODE(dp)) {
- case CCP_CONFREQ:
- case CCP_TERMREQ:
- case CCP_TERMACK:
-/*
- * 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);
- }
- break;
+ /* If this is a control char to be ignored, do so */
+ if (in_rmap(ppp, chr))
+ continue;
- case CCP_CONFACK:
- if ((ppp->flags & SC_CCP_OPEN) == 0)
- break;
- if (ppp->flags & SC_CCP_UP)
- break;
- if (slen < (CCP_HDRLEN + CCP_OPT_MINLEN))
- break;
- if (slen < (CCP_OPT_LENGTH (opt) + CCP_HDRLEN))
- break;
-/*
- * we're agreeing to send compressed packets.
- */
- if (!rcvd) {
- if (ppp->sc_xc_state == NULL)
- break;
+ /*
+ * Modify the next character if preceded by escape.
+ * The escape character (0x7d) could be an escaped
+ * 0x5d, if it follows an escape :-)
+ */
+ if (ppp->escape) {
+ chr ^= PPP_TRANS;
+ ppp->escape = 0;
+ } else if (chr == PPP_ESCAPE) {
+ ppp->escape = PPP_TRANS;
+ continue;
+ }
- if ((*ppp->sc_xcomp->comp_init)
- (ppp->sc_xc_state,
- opt,
- opt_len,
- ppp2dev (ppp)->base_addr,
- 0,
- ppp->flags & SC_DEBUG)) {
+ /*
+ * Allocate an skbuff on the first character received.
+ * The 128 is room for VJ header expansion and FCS.
+ */
+ if (skb == NULL) {
+ skb = dev_alloc_skb(ppp->mru + 128 + PPP_HDRLEN);
+ if (skb == NULL) {
if (ppp->flags & SC_DEBUG)
- printk(KERN_DEBUG "%s: comp running\n",
- ppp->name);
- cli();
- ppp->flags |= SC_COMP_RUN;
+ printk(KERN_DEBUG "couldn't "
+ "alloc skb for recv\n");
+ ppp->toss = 1;
+ continue;
}
- break;
}
-/*
- * peer is agreeing to send compressed packets.
- */
- if (ppp->sc_rc_state == NULL)
- break;
- if ((*ppp->sc_rcomp->decomp_init)
- (ppp->sc_rc_state,
- opt,
- opt_len,
- ppp2dev (ppp)->base_addr,
- 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);
+ /*
+ * Decompress A/C and protocol compression here.
+ */
+ if (skb->len == 0 && chr != PPP_ALLSTATIONS) {
+ p = skb_put(skb, 2);
+ p[0] = PPP_ALLSTATIONS;
+ p[1] = PPP_UI;
+ }
+ if (skb->len == 2 && (chr & 1) != 0) {
+ p = skb_put(skb, 1);
+ p[0] = 0;
}
- break;
-/*
- * 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)) {
- (*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);
- if (ppp->flags & SC_DEBUG)
- printk(KERN_DEBUG "%s: decomp reset\n",
- ppp->name);
- cli();
- ppp->flags &= ~SC_DC_ERROR;
- }
+ /*
+ * Check if we've overflowed the MRU
+ */
+ if (skb->len >= ppp->mru + PPP_HDRLEN + 2
+ || skb_tailroom(skb) <= 0) {
+ ++ppp->estats.rx_length_errors;
+ ppp->toss = 0xC0;
+ if (ppp->flags & SC_DEBUG)
+ printk(KERN_DEBUG "rcv frame too long: "
+ "len=%d mru=%d hroom=%d troom=%d\n",
+ skb->len, ppp->mru, skb_headroom(skb),
+ skb_tailroom(skb));
+ continue;
}
- break;
+
+ /*
+ * Store the character and update the FCS.
+ */
+ p = skb_put(skb, 1);
+ *p = chr;
+ ppp->rfcs = PPP_FCS(ppp->rfcs, chr);
}
- if (ppp->flags & SC_DEBUG)
- printk(KERN_DEBUG "ppp_proto_ccp: %s code %d, flags=%x\n",
- (rcvd? "rcvd": "sent"), CCP_CODE(dp), ppp->flags);
- restore_flags(flags);
+ ppp->rpkt = skb;
}
-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);
-}
+/*************************************************************
+ * PPP NETWORK INTERFACE SUPPORT
+ * The following code implements the PPP network
+ * interface device and handles those parts of
+ * the PPP processing which are independent of the
+ * type of hardware link being used, including
+ * VJ and packet compression.
+ *************************************************************/
/*
- * Handle a LQR packet.
+ * Network device driver callback routines
*/
-static int
-rcv_proto_lqr (struct ppp *ppp, __u16 proto, __u8 * data, int len)
-{
- return rcv_proto_unknown (ppp, proto, data, len);
-}
+static int ppp_init_dev(struct device *dev);
+static int ppp_dev_open(struct device *);
+static int ppp_dev_ioctl(struct device *dev, struct ifreq *ifr, int cmd);
+static int ppp_dev_close(struct device *);
+static int ppp_dev_xmit(struct sk_buff *, struct device *);
+static struct net_device_stats *ppp_dev_stats (struct device *);
-/*************************************************************
- * 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.
- *************************************************************/
+/*
+ * Information for the protocol decoder
+ */
-/* read a PPP frame from the us_rbuff circular buffer,
- waiting if necessary
-*/
+typedef int (*pfn_proto) (struct ppp *, struct sk_buff *);
-static ssize_t
-ppp_tty_read (struct tty_struct *tty, struct file *file, __u8 * buf, size_t nr)
-{
- struct ppp *ppp = tty2ppp (tty);
- __u8 c;
- ssize_t len, ret;
+typedef struct ppp_proto_struct {
+ int proto;
+ pfn_proto func;
+} ppp_proto_type;
-#define GETC(c) \
-{ \
- c = buf_base (ppp->ubuf) [ppp->ubuf->tail++]; \
- ppp->ubuf->tail &= ppp->ubuf->size; \
-}
+static int rcv_proto_ip (struct ppp *, struct sk_buff *);
+static int rcv_proto_ipx (struct ppp *, struct sk_buff *);
+static int rcv_proto_at (struct ppp *, struct sk_buff *);
+static int rcv_proto_vjc_comp (struct ppp *, struct sk_buff *);
+static int rcv_proto_vjc_uncomp (struct ppp *, struct sk_buff *);
+static int rcv_proto_ccp (struct ppp *, struct sk_buff *);
+static int rcv_proto_unknown (struct ppp *, struct sk_buff *);
-/*
- * Validate the pointers
- */
- if (!ppp)
- return -EIO;
- CHECK_PPP (-ENXIO);
+static
+ppp_proto_type proto_list[] = {
+ { PPP_IP, rcv_proto_ip },
+ { PPP_IPX, rcv_proto_ipx },
+ { PPP_AT, rcv_proto_at },
+ { PPP_VJC_COMP, rcv_proto_vjc_comp },
+ { PPP_VJC_UNCOMP, rcv_proto_vjc_uncomp },
+ { PPP_CCP, rcv_proto_ccp },
+ { 0, rcv_proto_unknown } /* !!! MUST BE LAST !!! */
+};
/*
- * Before we attempt to write the frame to the user, ensure that the
- * user has access to the pages for the total buffer length.
+ * Called when the PPP network interface device is actually created.
*/
- if (verify_area (VERIFY_WRITE, buf, nr))
- return -EFAULT;
+static int
+ppp_init_dev (struct device *dev)
+{
+ dev->hard_header_len = PPP_HDRLEN;
-/*
- * Increment the module use count so that the module can't get unloaded
- * while we're sleeping below. The problem is that ppp_tty_close() can
- * get called (as a result of a hangup from the tty) while we're sleeping.
- */
- MOD_INC_USE_COUNT;
+ /* device INFO */
+ dev->mtu = PPP_MTU;
+ dev->hard_start_xmit = ppp_dev_xmit;
+ dev->open = ppp_dev_open;
+ dev->stop = ppp_dev_close;
+ dev->get_stats = ppp_dev_stats;
+ dev->do_ioctl = ppp_dev_ioctl;
+ dev->addr_len = 0;
+ dev->tx_queue_len = 10;
+ dev->type = ARPHRD_PPP;
-/*
- * Acquire the read lock.
- */
- for (;;) {
- ret = 0;
- ppp = tty2ppp (tty);
- if (!ppp || ppp->magic != PPP_MAGIC || !ppp->inuse
- || tty != ppp->tty)
- goto done;
+ dev_init_buffers(dev);
- if (test_and_set_bit (0, &ppp->ubuf->locked) != 0) {
- current->timeout = 0;
- current->state = TASK_INTERRUPTIBLE;
- schedule();
-
- ret = -EINTR;
- if (signal_pending(current))
- goto done;
- continue;
- }
+ dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
-/*
- * Fetch the length of the buffer from the first two bytes.
- */
- if (ppp->ubuf->head == ppp->ubuf->tail)
- len = 0;
- else {
- GETC (c);
- len = c << 8;
- GETC (c);
- len += c;
- if (len)
- break;
- }
+ return 0;
+}
/*
- * If there is no length then wait for the data to arrive.
+ * Callback from the network layer when the device goes up.
*/
- /* no data */
- clear_bit (0, &ppp->ubuf->locked);
- ret = -EAGAIN;
- if (file->f_flags & O_NONBLOCK)
- goto done;
- current->timeout = 0;
- interruptible_sleep_on (&ppp->read_wait);
- ret = -EINTR;
- if (signal_pending(current))
- goto done;
- }
-/*
- * 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 */
+static int
+ppp_dev_open (struct device *dev)
+{
+ struct ppp *ppp = dev2ppp(dev);
- if (ppp->flags & SC_DEBUG)
- printk (KERN_DEBUG
- "ppp: read of %lu bytes too small for %ld "
- "frame\n", (unsigned long) nr, (long) len + 2);
- ppp->stats.ppp_ierrors++;
- ret = -EOVERFLOW;
- goto out;
+ if (!ppp->inuse || ppp2tty(ppp) == NULL) {
+ printk(KERN_ERR "ppp: %s not active\n", dev->name);
+ return -ENXIO;
}
-/*
- * Fake the insertion of the ADDRESS and CONTROL information because these
- * were not saved in the buffer.
- */
- ret = -EFAULT;
- if (put_user((u_char) PPP_ALLSTATIONS, buf)
- || put_user((u_char) PPP_UI, buf+1))
- goto out;
- buf += 2;
+ MOD_INC_USE_COUNT;
+
+ return 0;
+}
/*
- * Copy the received data from the buffer to the caller's area.
+ * Callback from the network layer when the ppp device goes down.
*/
- nr = len + 2; /* Account for ADDRESS and CONTROL bytes */
- while (len-- > 0) {
- GETC (c);
- if (put_user(c, buf))
- goto out;
- ++buf;
- }
- ret = nr;
-out:
- if (len > 0)
- ppp->ubuf->tail = (ppp->ubuf->tail + len) & ppp->ubuf->size;
- clear_bit(0, &ppp->ubuf->locked);
+static int
+ppp_dev_close (struct device *dev)
+{
+ struct ppp *ppp = dev2ppp (dev);
+
+ CHECK_PPP_MAGIC(ppp);
-done:
MOD_DEC_USE_COUNT;
- return ret;
-#undef GETC
-}
-/* stuff a character into the transmit buffer, using PPP's way of escaping
- special characters.
- also, update fcs to take account of new character */
+ return 0;
+}
-extern inline void
-ppp_stuff_char (struct ppp *ppp, register struct ppp_buffer *buf,
- register __u8 chr)
+static inline void
+get_vj_stats(struct vjstat *vj, struct slcompress *slc)
{
-/*
- * The buffer should not be full.
- */
- if (ppp->flags & SC_DEBUG) {
- if ((buf->count < 0) || (buf->count > 3000))
- printk (KERN_DEBUG "ppp_stuff_char: %d %x\n",
- (unsigned int) buf->count,
- (unsigned int) chr);
- }
-/*
- * Update the FCS and if the character needs to be escaped, do it.
- */
- buf->fcs = PPP_FCS (buf->fcs, chr);
- if (in_xmap (ppp, chr)) {
- chr ^= PPP_TRANS;
- ins_char (buf, PPP_ESCAPE);
- }
-/*
- * Add the character to the buffer.
- */
- ins_char (buf, chr);
+ vj->vjs_packets = slc->sls_o_compressed + slc->sls_o_uncompressed;
+ vj->vjs_compressed = slc->sls_o_compressed;
+ vj->vjs_searches = slc->sls_o_searches;
+ vj->vjs_misses = slc->sls_o_misses;
+ vj->vjs_errorin = slc->sls_i_error;
+ vj->vjs_tossed = slc->sls_i_tossed;
+ vj->vjs_uncompressedin = slc->sls_i_uncompressed;
+ vj->vjs_compressedin = slc->sls_i_compressed;
}
/*
- * Procedure to encode the data with the proper escaping and send the
- * data to the remote system.
+ * Callback from the network layer to process the sockioctl functions.
*/
-
-static void
-ppp_dev_xmit_lower (struct ppp *ppp, struct ppp_buffer *buf,
- __u8 *data, int count, int non_ip)
+static int
+ppp_dev_ioctl (struct device *dev, struct ifreq *ifr, int cmd)
{
- __u16 write_fcs;
- int address, control;
- int proto;
+ struct ppp *ppp = dev2ppp(dev);
+ int nb;
+ union {
+ struct ppp_stats stats;
+ struct ppp_comp_stats cstats;
+ char vers[32];
+ } u;
- CHECK_PPP_VOID();
- CHECK_BUF_MAGIC(buf);
- ++ppp->stats.ppp_opackets;
- ppp->stats.ppp_ooctects += count;
+ CHECK_PPP_MAGIC(ppp);
-/*
- * Insert the leading FLAG character
- */
- buf->count = 0;
+ memset(&u, 0, sizeof(u));
+ switch (cmd) {
+ case SIOCGPPPSTATS:
+ u.stats.p = ppp->stats;
+ if (ppp->slcomp != NULL)
+ get_vj_stats(&u.stats.vj, ppp->slcomp);
+ nb = sizeof(u.stats);
+ break;
- if (non_ip || flag_time == 0)
- ins_char (buf, PPP_FLAG);
- else {
- if (jiffies - ppp->last_xmit >= flag_time)
- ins_char (buf, PPP_FLAG);
- }
- ppp->last_xmit = jiffies;
- buf->fcs = PPP_INITFCS;
-/*
- * Emit the address/control information if needed
- */
- address = PPP_ADDRESS (data);
- control = PPP_CONTROL (data);
- proto = PPP_PROTOCOL (data);
+ case SIOCGPPPCSTATS:
+ if (ppp->sc_xc_state != NULL)
+ (*ppp->sc_xcomp->comp_stat)
+ (ppp->sc_xc_state, &u.cstats.c);
+ if (ppp->sc_rc_state != NULL)
+ (*ppp->sc_rcomp->decomp_stat)
+ (ppp->sc_rc_state, &u.cstats.d);
+ nb = sizeof(u.cstats);
+ break;
- if (address != PPP_ALLSTATIONS ||
- control != PPP_UI ||
- (ppp->flags & SC_COMP_AC) == 0) {
- ppp_stuff_char (ppp, buf, address);
- ppp_stuff_char (ppp, buf, control);
- }
-/*
- * Emit the protocol (compressed if possible)
- */
- if ((ppp->flags & SC_COMP_PROT) == 0 || (proto & 0xFF00))
- ppp_stuff_char (ppp, buf, proto >> 8);
+ case SIOCGPPPVER:
+ strcpy(u.vers, szVersion);
+ nb = strlen(u.vers) + 1;
+ break;
- ppp_stuff_char (ppp, buf, proto);
-/*
- * Insert the data
- */
- data += 4;
- count -= 4;
+ default:
+ return -EINVAL;
+ }
- while (count-- > 0)
- ppp_stuff_char (ppp, buf, *data++);
-/*
- * Add the trailing CRC and the final flag character
- */
- write_fcs = buf->fcs ^ 0xFFFF;
- ppp_stuff_char (ppp, buf, write_fcs);
- ppp_stuff_char (ppp, buf, write_fcs >> 8);
-/*
- * Add the trailing flag character
- */
- ins_char (buf, PPP_FLAG);
-/*
- * Send the block to the tty driver.
- */
- ppp->stats.ppp_obytes += buf->count;
- ppp_kick_tty (ppp, buf);
+ if (copy_to_user((void *) ifr->ifr_ifru.ifru_data, &u, nb))
+ return -EFAULT;
+ return 0;
}
/*
- * 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.
+ * Process the generic PPP ioctls, i.e. those which are not specific
+ * to any particular type of hardware link.
*/
-
static int
-ppp_dev_xmit_frame (struct ppp *ppp, struct ppp_buffer *buf,
- __u8 *data, int count)
+ppp_ioctl(struct ppp *ppp, unsigned int param2, unsigned long param3)
{
- int proto;
- int address, control;
- __u8 *new_data;
- int new_count;
+ register int temp_i = 0, oldflags;
+ int error = -EFAULT;
+ unsigned long flags;
+ struct ppp_idle cur_ddinfo;
+ struct npioctl npi;
- CHECK_PPP(0);
- CHECK_BUF_MAGIC(buf);
-/*
- * Print the buffer
- */
- if (ppp->flags & SC_LOG_OUTPKT)
- ppp_print_buffer ("write frame", data, count);
-/*
- * Determine if the frame may be compressed. Attempt to compress the
- * frame if possible.
- */
- proto = PPP_PROTOCOL (data);
- address = PPP_ADDRESS (data);
- control = PPP_CONTROL (data);
+ CHECK_PPP(-ENXIO);
- if (((ppp->flags & SC_COMP_RUN) != 0) &&
- (ppp->sc_xc_state != (void *) 0) &&
- (address == PPP_ALLSTATIONS) &&
- (control == PPP_UI) &&
- (proto != PPP_LCP) &&
- (proto != PPP_CCP)) {
- new_data = kmalloc (ppp->mtu + PPP_HDRLEN, GFP_ATOMIC);
- if (new_data == NULL) {
- printk (KERN_ERR "ppp_dev_xmit_frame: no memory\n");
- return 1;
- }
+ /*
+ * The user must have an euid of root to do these requests.
+ */
+ if (!capable(CAP_NET_ADMIN))
+ return -EPERM;
- new_count = (*ppp->sc_xcomp->compress)
- (ppp->sc_xc_state, data, new_data, count,
- ppp->mtu + PPP_HDRLEN);
+ switch (param2) {
+ case PPPIOCSMRU:
+ /*
+ * Set the MRU value
+ */
+ if (get_user(temp_i, (int *) param3))
+ break;
+ if (temp_i < PPP_MRU)
+ temp_i = PPP_MRU;
+ if (ppp->flags & SC_DEBUG)
+ printk(KERN_INFO
+ "ppp_ioctl: set mru to %x\n", temp_i);
+ error = 0;
+ break;
- if (new_count > 0 && (ppp->flags & SC_CCP_UP)) {
- ppp_dev_xmit_lower (ppp, buf, new_data, new_count, 0);
- kfree (new_data);
- return 0;
- }
-/*
- * The frame could not be compressed, or it could not be sent in
- * compressed form because CCP is not yet up.
- */
- kfree (new_data);
- }
-/*
- * Go to the escape encoding
- */
- ppp_dev_xmit_lower (ppp, buf, data, count, !!(proto & 0xFF00));
- return 0;
-}
+ case PPPIOCGFLAGS:
+ /*
+ * Fetch the current flags
+ */
+ temp_i = ppp->flags & SC_MASK;
+#ifndef CHECK_CHARACTERS /* Don't generate errors if we don't check chars. */
+ temp_i |= SC_RCV_B7_1 | SC_RCV_B7_0 |
+ SC_RCV_ODDP | SC_RCV_EVNP;
+#endif
+ if (put_user(temp_i, (int *) param3))
+ break;
+ error = 0;
+ break;
-/*
- * Revise the tty frame for specific protocols.
- */
+ case PPPIOCSFLAGS:
+ /*
+ * Set the flags for the various options
+ */
+ if (get_user(temp_i, (int *) param3))
+ break;
-static int
-send_revise_frame (register struct ppp *ppp, __u8 *data, int len)
-{
- __u8 *p;
+ if (ppp->flags & ~temp_i & SC_CCP_OPEN)
+ ppp_ccp_closed(ppp);
- switch (PPP_PROTOCOL (data)) {
-/*
- * Update the LQR frame with the current MIB information. This saves having
- * the daemon read old MIB data from the driver.
- */
- case PPP_LQR:
- len = 48; /* total size of this frame */
- p = (__u8 *) &data [40]; /* Point to last two items. */
- p = store_long (p, ppp->stats.ppp_opackets + 1);
- p = store_long (p, ppp->stats.ppp_ooctects + len);
+ save_flags(flags);
+ cli();
+ oldflags = ppp->flags;
+ temp_i = (temp_i & SC_MASK) | (oldflags & ~SC_MASK);
+ ppp->flags = temp_i;
+ restore_flags(flags);
+
+ if ((oldflags | temp_i) & SC_DEBUG)
+ printk(KERN_INFO
+ "ppp_ioctl: set flags to %x\n", temp_i);
+ error = 0;
break;
-/*
- * Outbound compression frames
- */
- case PPP_CCP:
- ppp_proto_ccp (ppp,
- data + PPP_HDRLEN,
- len - PPP_HDRLEN,
- 0);
+
+ case PPPIOCSCOMPRESS:
+ /*
+ * Set the compression mode
+ */
+ error = ppp_set_compression
+ (ppp, (struct ppp_option_data *) param3);
break;
- default:
+ case PPPIOCGUNIT:
+ /*
+ * Obtain the unit number for this device.
+ */
+ if (put_user(ppp->line, (int *) param3))
+ break;
+ if (ppp->flags & SC_DEBUG)
+ printk(KERN_INFO
+ "ppp_ioctl: get unit: %d\n", ppp->line);
+ error = 0;
break;
- }
- return len;
-}
+ case PPPIOCSDEBUG:
+ /*
+ * Set the debug level
+ */
+ if (get_user(temp_i, (int *) param3))
+ break;
+ temp_i = (temp_i & 0x1F) << 16;
-/*
- * write a frame with NR chars from BUF to TTY
- * we have to put the FCS field on ourselves
- */
+ if ((ppp->flags | temp_i) & SC_DEBUG)
+ printk(KERN_INFO
+ "ppp_ioctl: set dbg flags to %x\n", temp_i);
-static ssize_t
-ppp_tty_write (struct tty_struct *tty, struct file *file, const __u8 * data,
- size_t count)
-{
- struct ppp *ppp = tty2ppp (tty);
- __u8 *new_data;
- int error;
- struct wait_queue wait = {current, NULL};
+ save_flags(flags);
+ cli();
+ ppp->flags = (ppp->flags & ~0x1F0000) | temp_i;
+ restore_flags(flags);
+ error = 0;
+ break;
-/*
- * Verify the pointers.
- */
- error = -EIO;
- if (!ppp)
- goto out;
- if (ppp->magic != PPP_MAGIC)
- goto out;
+ case PPPIOCGDEBUG:
+ /*
+ * Get the debug level
+ */
+ temp_i = (ppp->flags >> 16) & 0x1F;
+ if (put_user(temp_i, (int *) param3))
+ break;
+ error = 0;
+ break;
- CHECK_PPP (-ENXIO);
-/*
- * Ensure that the caller does not wish to send too much.
- */
- if (count > PPP_MTU + PPP_HDRLEN) {
- if (ppp->flags & SC_DEBUG)
- printk (KERN_WARNING
- "ppp_tty_write: truncating user packet "
- "from %lu to mtu %d\n", (unsigned long) count,
- PPP_MTU + PPP_HDRLEN);
- count = PPP_MTU + PPP_HDRLEN;
- }
-/*
- * Allocate a buffer for the data and fetch it from the user space.
- */
- new_data = kmalloc (count, GFP_KERNEL);
- if (new_data == NULL) {
- printk (KERN_ERR "ppp_tty_write: no memory\n");
- return 0;
- }
-/*
- * Retrieve the user's buffer
- */
- error = -EFAULT;
- if (copy_from_user(new_data, data, count))
- goto out_free;
+ case PPPIOCGIDLE:
+ /*
+ * Get the times since the last send/receive frame operation
+ */
+ /* change absolute times to relative times. */
+ cur_ddinfo.xmit_idle = (jiffies - ppp->last_xmit) / HZ;
+ cur_ddinfo.recv_idle = (jiffies - ppp->last_recv) / HZ;
+ if (copy_to_user((void *) param3, &cur_ddinfo,
+ sizeof (cur_ddinfo)))
+ break;
+ error = 0;
+ break;
-/*
- * Increment the module use count so that the module can't get unloaded
- * while we're sleeping below. The problem is that ppp_tty_close() can
- * get called (as a result of a hangup from the tty) while we're sleeping.
- */
- MOD_INC_USE_COUNT;
+ case PPPIOCSMAXCID:
+ /*
+ * Set the maximum VJ header compression slot number.
+ */
+ if (get_user(temp_i, (int *) param3))
+ break;
+ error = -EINVAL;
+ if (temp_i < 2 || temp_i > 255)
+ break;
+ ++temp_i;
+ if (ppp->flags & SC_DEBUG)
+ printk(KERN_INFO "ppp_ioctl: set maxcid to %d\n",
+ temp_i);
+ if (ppp->slcomp != NULL)
+ slhc_free(ppp->slcomp);
+ ppp->slcomp = slhc_init(16, temp_i);
-/*
- * Lock this PPP unit so we will be the only writer,
- * sleeping if necessary.
- *
- * Note that we add our task to the wait queue before
- * attempting to lock, as the lock flag may be cleared
- * from an interrupt.
- */
- add_wait_queue(&ppp->write_wait, &wait);
- while (1) {
+ error = -ENOMEM;
+ if (ppp->slcomp == NULL) {
+ printk(KERN_ERR "ppp: no memory for VJ compression\n");
+ break;
+ }
error = 0;
- current->timeout = 0;
- current->state = TASK_INTERRUPTIBLE;
- if (lock_buffer(ppp->tbuf) == 0)
+ break;
+
+ case PPPIOCGNPMODE:
+ case PPPIOCSNPMODE:
+ if (copy_from_user(&npi, (void *) param3, sizeof(npi)))
break;
- schedule();
- error = -EINVAL;
- ppp = tty2ppp (tty);
- if (!ppp || ppp->magic != PPP_MAGIC ||
- !ppp->inuse || tty != ppp->tty) {
- printk("ppp_tty_write: %p invalid after wait!\n", ppp);
+ switch (npi.protocol) {
+ case PPP_IP:
+ npi.protocol = NP_IP;
+ break;
+ case PPP_IPX:
+ npi.protocol = NP_IPX;
break;
+ case PPP_AT:
+ npi.protocol = NP_AT;
+ break;
+ default:
+ if (ppp->flags & SC_DEBUG)
+ printk(KERN_DEBUG "pppioc[gs]npmode: "
+ "invalid proto %d\n", npi.protocol);
+ error = -EINVAL;
+ goto out;
+ }
+
+ if (param2 == PPPIOCGNPMODE) {
+ npi.mode = ppp->sc_npmode[npi.protocol];
+ if (copy_to_user((void *) param3, &npi, sizeof(npi)))
+ break;
+ } else {
+ 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);
+ mark_bh(NET_BH);
}
- error = -EINTR;
- if (signal_pending(current))
- break;
- }
- current->state = TASK_RUNNING;
- remove_wait_queue(&ppp->write_wait, &wait);
- if (error)
- goto out_free_dec;
+ error = 0;
+ break;
-/*
- * Change the LQR frame
- */
- count = send_revise_frame (ppp, new_data, count);
-/*
- * Send the data
- */
- if (PPP_PROTOCOL(new_data) == PPP_IP) {
+ default:
/*
- * 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.
+ * All other ioctl() events will come here.
*/
- ppp_dev_xmit_ip(ppp, ppp->tbuf, new_data + PPP_HDRLEN,
- count - PPP_HDRLEN, NPMODE_PASS);
+ if (ppp->flags & SC_DEBUG)
+ printk(KERN_ERR
+ "ppp_ioctl: invalid ioctl: %x, addr %lx\n",
+ param2, param3);
- } else {
- ppp_dev_xmit_frame (ppp, ppp->tbuf, new_data, count);
+ error = -ENOIOCTLCMD;
+ break;
}
- error = count;
-
-out_free_dec:
- MOD_DEC_USE_COUNT;
-out_free:
- kfree (new_data);
out:
return error;
}
@@ -2166,7 +1572,6 @@
/*
* Process the set-compression ioctl.
*/
-
static int
ppp_set_compression (struct ppp *ppp, struct ppp_option_data *odp)
{
@@ -2177,16 +1582,16 @@
__u8 ccp_option[CCP_MAX_OPTION_LENGTH];
struct ppp_option_data data;
-/*
- * Fetch the compression parameters
- */
+ /*
+ * Fetch the compression parameters
+ */
error = -EFAULT;
if (copy_from_user(&data, odp, sizeof (data)))
goto out;
nb = data.length;
ptr = data.ptr;
- if ((__u32) nb >= (__u32)CCP_MAX_OPTION_LENGTH)
+ if ((unsigned) nb >= CCP_MAX_OPTION_LENGTH)
nb = CCP_MAX_OPTION_LENGTH;
if (copy_from_user(ccp_option, ptr, nb))
@@ -2211,8 +1616,15 @@
}
#endif /* CONFIG_KMOD */
- if (cp == NULL)
- goto out_no_comp;
+ if (cp == NULL) {
+ if (ppp->flags & SC_DEBUG)
+ printk(KERN_DEBUG
+ "%s: no compressor for [%x %x %x], %x\n",
+ ppp->name, ccp_option[0], ccp_option[1],
+ ccp_option[2], nb);
+ goto out; /* compressor not loaded */
+ }
+
/*
* Found a handler for the protocol - try to allocate
* a compressor or decompressor.
@@ -2226,12 +1638,11 @@
ppp->sc_xcomp = cp;
ppp->sc_xc_state = cp->comp_alloc(ccp_option, nb);
if (ppp->sc_xc_state == NULL) {
- printk(KERN_WARNING "%s: comp_alloc failed\n",
- ppp->name);
+ if (ppp->flags & SC_DEBUG)
+ 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);
+ }
} else {
if (ppp->sc_rc_state != NULL)
(*ppp->sc_rcomp->decomp_free)(ppp->sc_rc_state);
@@ -2240,761 +1651,817 @@
ppp->sc_rcomp = cp;
ppp->sc_rc_state = cp->decomp_alloc(ccp_option, nb);
if (ppp->sc_rc_state == NULL) {
- printk(KERN_WARNING "%s: decomp_alloc failed\n",
- ppp->name);
+ if (ppp->flags & SC_DEBUG)
+ 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);
+ }
}
out:
return error;
-
-out_no_comp:
- error = -EINVAL; /* no handler found */
- if (ppp->flags & SC_DEBUG)
- printk(KERN_DEBUG "%s: no compressor for [%x %x %x], %x\n",
- ppp->name, ccp_option[0], ccp_option[1],
- ccp_option[2], nb);
- goto out;
}
/*
- * Process the IOCTL event for the tty device.
+ * Handle a CCP packet.
+ *
+ * The CCP packet is passed along to the pppd process just like any
+ * other PPP frame. The difference is that some processing needs to be
+ * immediate or the compressors will become confused on the peer.
*/
-static int
-ppp_tty_ioctl (struct tty_struct *tty, struct file * file,
- unsigned int param2, unsigned long param3)
+static void ppp_proto_ccp(struct ppp *ppp, __u8 *dp, int len, int rcvd)
{
- struct ppp *ppp = tty2ppp (tty);
- register int temp_i = 0, oldflags;
- int error = 0;
+ int slen = CCP_LENGTH(dp);
+ __u8 *opt = dp + CCP_HDRLEN;
+ int opt_len = slen - CCP_HDRLEN;
unsigned long flags;
-/*
- * Verify the status of the PPP device.
- */
- if (!ppp)
- return -EBADF;
- if (ppp->magic != PPP_MAGIC)
- return -EBADF;
-
- CHECK_PPP (-ENXIO);
-/*
- * The user must have an euid of root to do these requests.
- */
- if (!capable(CAP_NET_ADMIN))
- return -EPERM;
-/*
- * Set the MRU value
- */
- switch (param2) {
- case PPPIOCSMRU:
- error = get_user(temp_i, (int *) param3);
- if (error != 0)
- break;
- if (ppp->flags & SC_DEBUG)
- printk (KERN_INFO
- "ppp_tty_ioctl: set mru to %x\n", temp_i);
+ if (slen > len)
+ return;
- if (ppp->mru != temp_i)
- ppp_changedmtu (ppp, ppp2dev (ppp)->mtu, temp_i);
- break;
-/*
- * Fetch the flags
- */
- case PPPIOCGFLAGS:
- temp_i = (ppp->flags & SC_MASK);
-#ifndef CHECK_CHARACTERS /* Don't generate errors if we don't check chars. */
- temp_i |= SC_RCV_B7_1 | SC_RCV_B7_0 |
- SC_RCV_ODDP | SC_RCV_EVNP;
-#endif
- error = put_user(temp_i, (int *) param3);
+ if (ppp->flags & SC_DEBUG)
+ printk(KERN_DEBUG "ppp_proto_ccp rcvd=%d code=%x flags=%x\n",
+ rcvd, CCP_CODE(dp), ppp->flags);
+ save_flags(flags);
+ switch (CCP_CODE(dp)) {
+ case CCP_CONFREQ:
+ case CCP_TERMREQ:
+ case CCP_TERMACK:
+ /*
+ * 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);
+ }
break;
-/*
- * Set the flags for the various options
- */
- case PPPIOCSFLAGS:
- error = get_user(temp_i, (int *) param3);
- if (error != 0)
- break;
- temp_i &= SC_MASK;
- if ((ppp->flags & SC_CCP_OPEN) && (temp_i & SC_CCP_OPEN) == 0)
- ppp_ccp_closed(ppp);
-
- save_flags(flags);
- cli();
- oldflags = ppp->flags;
- ppp->flags = temp_i |= (ppp->flags & ~SC_MASK);
- restore_flags(flags);
- if ((oldflags | temp_i) & SC_DEBUG)
- printk (KERN_INFO
- "ppp_tty_ioctl: set flags to %x\n", temp_i);
- break;
-/*
- * Set the compression mode
- */
- case PPPIOCSCOMPRESS:
- error = ppp_set_compression (ppp,
- (struct ppp_option_data *) param3);
- break;
-/*
- * Retrieve the transmit async map
- */
- case PPPIOCGASYNCMAP:
- error = put_user(ppp->xmit_async_map[0], (int *) param3);
- break;
-/*
- * Set the transmit async map
- */
- case PPPIOCSASYNCMAP:
- error = get_user(temp_i, (int *) param3);
- if (error != 0)
+ case CCP_CONFACK:
+ if ((ppp->flags & SC_CCP_OPEN) == 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:
- error = get_user(temp_i, (int *) param3);
- if (error != 0)
+ if (ppp->flags & SC_CCP_UP)
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:
- error = put_user(ppp2dev (ppp)->base_addr, (int *) param3);
- if (error != 0)
+ if (slen < (CCP_HDRLEN + CCP_OPT_MINLEN))
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:
- error = get_user(temp_i, (int *) param3);
- if (error != 0)
+ if (slen < (CCP_OPT_LENGTH (opt) + CCP_HDRLEN))
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
- */
- case PPPIOCGDEBUG:
- temp_i = (ppp->flags >> 16) & 0x1F;
- error = put_user(temp_i, (int *) param3);
- break;
-/*
- * Get the times since the last send/receive frame operation
- */
- case PPPIOCGIDLE:
- {
- struct ppp_idle cur_ddinfo;
-
- /* change absolute times to relative times. */
- cur_ddinfo.xmit_idle = (jiffies - ppp->last_xmit) / HZ;
- cur_ddinfo.recv_idle = (jiffies - ppp->last_recv) / HZ;
- error = -EFAULT;
- if (!copy_to_user((void *) param3, &cur_ddinfo,
- sizeof (cur_ddinfo)))
- error = 0;
- }
- break;
-/*
- * Retrieve the extended async map
- */
- case PPPIOCGXASYNCMAP:
- error = -EFAULT;
- if (!copy_to_user((void *) param3, ppp->xmit_async_map,
- sizeof (ppp->xmit_async_map)))
- error = 0;
- break;
-/*
- * Set the async extended map
- */
- case PPPIOCSXASYNCMAP:
- {
- __u32 temp_tbl[8];
-
- error = -EFAULT;
- if (copy_from_user(temp_tbl, (void *) param3,
- sizeof (temp_tbl)))
+ if (!rcvd) {
+ /*
+ * we're agreeing to send compressed packets.
+ */
+ if (ppp->sc_xc_state == NULL)
break;
- temp_tbl[1] = 0x00000000;
- temp_tbl[2] &= ~0x40000000;
- temp_tbl[3] |= 0x60000000;
-
- error = 0;
- 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->sc_xcomp->comp_init)
+ (ppp->sc_xc_state,
+ opt, opt_len,
+ ppp->line, 0, ppp->flags & SC_DEBUG)) {
if (ppp->flags & SC_DEBUG)
- printk (KERN_INFO
- "ppp_tty_ioctl: set xasyncmap\n");
+ printk(KERN_DEBUG "%s: comp running\n",
+ ppp->name);
+ cli();
+ ppp->flags |= SC_COMP_RUN;
}
+ break;
}
- break;
-/*
- * Set the maximum VJ header compression slot number.
- */
- case PPPIOCSMAXCID:
- error = get_user(temp_i, (int *) param3);
- if (error != 0)
+
+ /*
+ * peer is agreeing to send compressed packets.
+ */
+ if (ppp->sc_rc_state == NULL)
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 = NULL;
- ppp->slcomp = slhc_init (16, temp_i);
- if (ppp->slcomp == NULL) {
- printk (KERN_ERR "ppp_tty_ioctl: "
- "no space for compression buffers!\n");
- ppp_release (ppp);
- error = -ENOMEM;
+ if ((*ppp->sc_rcomp->decomp_init)
+ (ppp->sc_rc_state,
+ opt, opt_len,
+ ppp->line, 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;
- case PPPIOCXFERUNIT:
- ppp->backup_tty = tty;
- ppp->sc_xfer = current->pid;
- break;
-
- case PPPIOCGNPMODE:
- case PPPIOCSNPMODE:
- {
- struct npioctl npi;
-
- error = -EFAULT;
- if (copy_from_user(&npi, (void *) param3, sizeof(npi)))
- break;
+ case CCP_RESETACK:
+ /*
+ * CCP Reset-ack resets compressors and decompressors
+ * as it passes through.
+ */
+ if ((ppp->flags & SC_CCP_UP) == 0)
+ break;
- if (npi.protocol != PPP_IP) {
+ if (!rcvd) {
+ 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 "pppioc[gs]npmode: "
- "invalid protocol %d\n",
- npi.protocol);
- error = -EINVAL;
- break;
+ printk(KERN_DEBUG "%s: comp reset\n",
+ ppp->name);
}
- npi.protocol = NP_IP;
-
- if (param2 == PPPIOCGNPMODE) {
- npi.mode = ppp->sc_npmode[npi.protocol];
- if (copy_to_user((void *) param3, &npi,
- sizeof (npi)))
- break;
+ } else {
+ if (ppp->sc_rc_state && (ppp->flags & SC_DECOMP_RUN)) {
+ (*ppp->sc_rcomp->decomp_reset)(ppp->sc_rc_state);
+ if (ppp->flags & SC_DEBUG)
+ printk(KERN_DEBUG "%s: decomp reset\n",
+ ppp->name);
+ cli();
+ ppp->flags &= ~SC_DC_ERROR;
}
-
- 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);
- /* N.B. Why is the busy flag cleared here? */
- ppp2dev(ppp)->tbusy = 0;
- mark_bh(NET_BH);
- error = 0;
- }
- break;
-/*
- * Allow users to read, but not set, the serial port parameters
- */
- case TCGETS:
- case TCGETA:
- error = n_tty_ioctl (tty, file, param2, param3);
- break;
-
- case FIONREAD:
- {
- int count = ppp->ubuf->tail - ppp->ubuf->head;
- if (count < 0)
- count += (ppp->ubuf->size + 1);
- error = put_user(count, (int *) param3);
}
break;
-/*
- * All other ioctl() events will come here.
- */
- default:
- if (ppp->flags & SC_DEBUG)
- printk (KERN_WARNING "ppp_tty_ioctl: "
- "invalid ioctl=%x, addr=%lx\n", param2, param3);
- error = -ENOIOCTLCMD;
- break;
}
- return error;
+ restore_flags(flags);
}
/*
- * TTY callback.
- *
- * Process the poll() statement for the PPP device.
+ * CCP is down; free (de)compressor state if necessary.
*/
-static unsigned int
-ppp_tty_poll (struct tty_struct *tty, struct file *filp, poll_table * wait)
+static void
+ppp_ccp_closed(struct ppp *ppp)
{
- struct ppp *ppp = tty2ppp (tty);
- unsigned int mask = 0;
-
- if (ppp && ppp->magic == PPP_MAGIC && tty == ppp->tty) {
- CHECK_PPP (0);
+ unsigned long flags;
- poll_wait(filp, &ppp->read_wait, wait);
- poll_wait(filp, &ppp->write_wait, wait);
+ 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;
+ }
- /* Must lock the user buffer area while checking. */
- CHECK_BUF_MAGIC(ppp->ubuf);
- 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;
+ if (ppp->sc_rc_state) {
+ (*ppp->sc_rcomp->decomp_free) (ppp->sc_rc_state);
+ ppp->sc_rc_state = NULL;
}
- return mask;
}
/*************************************************************
- * NETWORK OUTPUT
- * This routine accepts requests from the network layer
- * and attempts to deliver the packets.
- * It also includes various routines we are compelled to
- * have to make the network layer work (arp, etc...).
+ * RECEIVE-SIDE ROUTINES
*************************************************************/
/*
- * Callback from the network layer when the device goes up.
+ * On entry, a received frame is in skb.
+ * Check it and dispose as appropriate.
*/
-
static int
-ppp_dev_open (struct device *dev)
+ppp_receive_frame(struct ppp *ppp, struct sk_buff *skb)
{
- struct ppp *ppp = dev2ppp (dev);
+ __u8 *data;
+ int count;
+ int proto;
+ int new_count;
+ struct sk_buff *new_skb;
+ ppp_proto_type *proto_ptr;
- if (ppp2tty (ppp) == NULL) {
- printk (KERN_ERR
- "ppp: %s not connected to a TTY! can't go open!\n",
- dev->name);
- return -ENXIO;
+ /*
+ * An empty frame is ignored. This occurs if the FLAG sequence
+ * precedes and follows each frame.
+ */
+ if (skb == NULL)
+ return 1;
+ if (skb->len == 0) {
+ kfree_skb(skb);
+ return 1;
}
+ data = skb->data;
+ count = skb->len;
- if (ppp->flags & SC_DEBUG)
- printk (KERN_INFO
- "ppp: channel %s going up for IP packets!\n",
- dev->name);
+ /*
+ * 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;
+ }
- CHECK_PPP (-ENXIO);
- MOD_INC_USE_COUNT;
- return 0;
+ /*
+ * Verify the FCS of the frame and discard the FCS characters
+ * from the end of the buffer.
+ */
+ if (ppp->rfcs != 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 */
+ skb_trim(skb, count);
+
+ /*
+ * Process the active decompressor.
+ */
+ if (ppp->sc_rc_state != NULL &&
+ (ppp->flags & SC_DECOMP_RUN) &&
+ ((ppp->flags & (SC_DC_FERROR | SC_DC_ERROR)) == 0)) {
+ if (PPP_PROTOCOL(data) == PPP_COMP) {
+ /*
+ * If the frame is compressed then decompress it.
+ */
+ new_skb = dev_alloc_skb(ppp->mru + 128 + PPP_HDRLEN);
+ if (new_skb == NULL) {
+ printk(KERN_ERR "ppp_recv_frame: no memory\n");
+ new_count = DECOMP_ERROR;
+ } else {
+ new_count = (*ppp->sc_rcomp->decompress)
+ (ppp->sc_rc_state, data, count,
+ new_skb->data, ppp->mru + PPP_HDRLEN);
+ }
+ if (new_count > 0) {
+ /* Frame was decompressed OK */
+ kfree_skb(skb);
+ skb = new_skb;
+ count = new_count;
+ data = skb_put(skb, count);
+
+ } else {
+ /*
+ * On a decompression error, we pass the
+ * compressed frame up to pppd as an
+ * error indication.
+ */
+ if (ppp->flags & SC_DEBUG)
+ printk(KERN_INFO "%s: decomp err %d\n",
+ ppp->name, new_count);
+ if (new_skb != 0)
+ kfree_skb(new_skb);
+ if (ppp->slcomp != 0)
+ slhc_toss(ppp->slcomp);
+ ++ppp->stats.ppp_ierrors;
+ if (new_count == DECOMP_FATALERROR) {
+ ppp->flags |= SC_DC_FERROR;
+ } else {
+ ppp->flags |= SC_DC_ERROR;
+ }
+ }
+
+
+ } else {
+ /*
+ * The frame is not compressed. Pass it to the
+ * decompression code so it can update its
+ * dictionary if necessary.
+ */
+ (*ppp->sc_rcomp->incomp)(ppp->sc_rc_state,
+ data, count);
+ }
+ }
+ else if (PPP_PROTOCOL(data) == PPP_COMP && (ppp->flags & SC_DEBUG))
+ printk(KERN_INFO "%s: not decomp, rc_state=%p flags=%x\n",
+ ppp->name, ppp->sc_rc_state, ppp->flags);
+
+ /*
+ * Count the frame and print it
+ */
+ ++ppp->stats.ppp_ipackets;
+ ppp->stats.ppp_ioctects += count;
+ 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 protocol 0 which is the 'catch-all'
+ * to feed it to the pppd daemon.
+ */
+ proto = PPP_PROTOCOL(data);
+ 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, skb)) {
+ kfree_skb(skb);
+ ++ppp->stats.ppp_discards;
+ }
+
+ return 1;
}
/*
- * Callback from the network layer when the ppp device goes down.
+ * An input error has been detected, so we need to inform
+ * the VJ decompressor.
*/
+static void
+ppp_receive_error(struct ppp *ppp)
+{
+ CHECK_PPP_VOID();
+ if (ppp->slcomp != 0)
+ slhc_toss(ppp->slcomp);
+}
+
+/*
+ * Put the input frame into the networking system for the indicated protocol
+ */
static int
-ppp_dev_close (struct device *dev)
+ppp_rcv_rx(struct ppp *ppp, __u16 proto, struct sk_buff *skb)
{
- struct ppp *ppp = dev2ppp (dev);
- MOD_DEC_USE_COUNT;
- if (ppp2tty (ppp) == NULL) {
- return -ENXIO;
- }
+ /*
+ * Fill in a few fields of the skb and give it to netif_rx().
+ */
+ skb->dev = ppp2dev(ppp); /* We are the device */
+ skb->protocol = htons(proto);
+ skb->mac.raw = skb->data;
+ skb_pull(skb, PPP_HDRLEN); /* pull off ppp header */
+ ppp->last_recv = jiffies;
+ netif_rx (skb);
+ return 1;
+}
+
/*
- * We don't do anything about the device going down. It is not important
- * for us.
+ * Process the receipt of an IP frame
*/
- if (ppp->flags & SC_DEBUG)
- printk (KERN_INFO
- "ppp: channel %s going down for IP packets!\n",
- dev->name);
- CHECK_PPP (-ENXIO);
+static int
+rcv_proto_ip(struct ppp *ppp, struct sk_buff *skb)
+{
+ CHECK_PPP(0);
+ if ((ppp2dev(ppp)->flags & IFF_UP) && (skb->len > 0)
+ && ppp->sc_npmode[NP_IP] == NPMODE_PASS)
+ return ppp_rcv_rx(ppp, ETH_P_IP, skb);
return 0;
}
/*
- * IOCTL operation to read the version of the driver.
+ * Process the receipt of an IPX frame
*/
-
static int
-ppp_dev_ioctl_version (struct ppp *ppp, struct ifreq *ifr)
+rcv_proto_ipx(struct ppp *ppp, struct sk_buff *skb)
{
- int error;
- char *result = (char *) ifr->ifr_ifru.ifru_data;
- int len = strlen (szVersion) + 1;
-/*
- * Move the version data
- */
- error = -EFAULT;
- if (!copy_to_user(result, szVersion, len))
- error = 0;
- return error;
+ CHECK_PPP(0);
+ if (((ppp2dev(ppp)->flags & IFF_UP) != 0) && (skb->len > 0)
+ && ppp->sc_npmode[NP_IPX] == NPMODE_PASS)
+ return ppp_rcv_rx(ppp, ETH_P_IPX, skb);
+ return 0;
}
/*
- * IOCTL to read the statistics for the pppstats program.
+ * Process the receipt of an Appletalk frame
*/
-
static int
-ppp_dev_ioctl_stats (struct ppp *ppp, struct ifreq *ifr, struct device *dev)
+rcv_proto_at(struct ppp *ppp, struct sk_buff *skb)
{
- struct ppp_stats *result, temp;
- int error;
+ CHECK_PPP(0);
+ if ((ppp2dev(ppp)->flags & IFF_UP) && (skb->len > 0)
+ && ppp->sc_npmode[NP_AT] == NPMODE_PASS)
+ return ppp_rcv_rx(ppp, ETH_P_PPPTALK, skb);
+ return 0;
+}
+
/*
- * Supply the information for the caller. First move the version data
- * then move the ppp stats; and finally the vj stats.
+ * Process the receipt of an VJ Compressed frame
*/
- memset (&temp, 0, sizeof(temp));
- if (dev->flags & IFF_UP) {
- memcpy (&temp.p, &ppp->stats, sizeof (struct pppstat));
- if (ppp->slcomp != NULL) {
- temp.vj.vjs_packets = ppp->slcomp->sls_o_compressed+
- ppp->slcomp->sls_o_uncompressed;
- temp.vj.vjs_compressed = ppp->slcomp->sls_o_compressed;
- temp.vj.vjs_searches = ppp->slcomp->sls_o_searches;
- temp.vj.vjs_misses = ppp->slcomp->sls_o_misses;
- temp.vj.vjs_errorin = ppp->slcomp->sls_i_error;
- temp.vj.vjs_tossed = ppp->slcomp->sls_i_tossed;
- temp.vj.vjs_uncompressedin = ppp->slcomp->sls_i_uncompressed;
- temp.vj.vjs_compressedin = ppp->slcomp->sls_i_compressed;
- }
- }
-
- result = (struct ppp_stats *) ifr->ifr_ifru.ifru_data;
+static int
+rcv_proto_vjc_comp(struct ppp *ppp, struct sk_buff *skb)
+{
+ int new_count;
- error = -EFAULT;
- if (!copy_to_user(result, &temp, sizeof (temp)))
- error = 0;
- return error;
+ CHECK_PPP(0);
+ if ((ppp->flags & SC_REJ_COMP_TCP) || ppp->slcomp == NULL)
+ return 0;
+ new_count = slhc_uncompress(ppp->slcomp, skb->data + PPP_HDRLEN,
+ skb->len - PPP_HDRLEN);
+ if (new_count < 0) {
+ if (ppp->flags & SC_DEBUG)
+ printk(KERN_NOTICE
+ "ppp: error in VJ decompression\n");
+ return 0;
+ }
+ skb_put(skb, new_count + PPP_HDRLEN - skb->len);
+ return rcv_proto_ip(ppp, skb);
}
/*
- * IOCTL to read the compression statistics for the pppstats program.
+ * Process the receipt of an VJ Un-compressed frame
*/
+static int
+rcv_proto_vjc_uncomp(struct ppp *ppp, struct sk_buff *skb)
+{
+ CHECK_PPP(0);
+ if ((ppp->flags & SC_REJ_COMP_TCP) || ppp->slcomp == NULL)
+ return 0;
+ if (slhc_remember(ppp->slcomp, skb->data + PPP_HDRLEN,
+ skb->len - PPP_HDRLEN) <= 0) {
+ if (ppp->flags & SC_DEBUG)
+ printk(KERN_NOTICE "ppp: error in VJ memorizing\n");
+ return 0;
+ }
+ return rcv_proto_ip(ppp, skb);
+}
static int
-ppp_dev_ioctl_comp_stats (struct ppp *ppp, struct ifreq *ifr, struct device *dev)
+rcv_proto_ccp(struct ppp *ppp, struct sk_buff *skb)
{
- struct ppp_comp_stats *result, temp;
- int error;
+ CHECK_PPP(0);
+ ppp_proto_ccp (ppp, skb->data + PPP_HDRLEN, skb->len - PPP_HDRLEN, 1);
+ return rcv_proto_unknown(ppp, skb);
+}
+
/*
- * Supply the information for the caller.
+ * Receive all unclassified protocols.
*/
- memset (&temp, 0, sizeof(temp));
- if (dev->flags & IFF_UP) {
- if (ppp->sc_xc_state != NULL)
- (*ppp->sc_xcomp->comp_stat) (ppp->sc_xc_state,
- &temp.c);
+static int
+rcv_proto_unknown(struct ppp *ppp, struct sk_buff *skb)
+{
+ CHECK_PPP(0);
- if (ppp->sc_rc_state != NULL)
- (*ppp->sc_rcomp->decomp_stat) (ppp->sc_rc_state,
- &temp.d);
+ /*
+ * Limit queue length by dropping old frames.
+ */
+ skb_queue_tail(&ppp->rcv_q, skb);
+ while (ppp->rcv_q.qlen > PPP_MAX_RCV_QLEN) {
+ struct sk_buff *skb = skb_dequeue(&ppp->rcv_q);
+ if (skb)
+ kfree_skb(skb);
}
-/*
- * Move the data to the caller's buffer
- */
- result = (struct ppp_comp_stats *) ifr->ifr_ifru.ifru_data;
- error = -EFAULT;
- if (!copy_to_user(result, &temp, sizeof (temp)))
- error = 0;
- return error;
+ wake_up_interruptible (&ppp->read_wait);
+ if (ppp->tty->fasync != NULL)
+ kill_fasync (ppp->tty->fasync, SIGIO);
+
+ return 1;
}
-/*
- * Callback from the network layer to process the sockioctl functions.
- */
+/*************************************************************
+ * TRANSMIT-SIDE ROUTINES
+ *************************************************************/
-static int
-ppp_dev_ioctl (struct device *dev, struct ifreq *ifr, int cmd)
-{
- struct ppp *ppp = dev2ppp (dev);
- int error;
+/* local function to store a value into the LQR frame */
+extern inline __u8 * store_long (register __u8 *p, register int value) {
+ *p++ = (__u8) (value >> 24);
+ *p++ = (__u8) (value >> 16);
+ *p++ = (__u8) (value >> 8);
+ *p++ = (__u8) value;
+ return p;
+}
- CHECK_PPP_MAGIC(ppp);
/*
- * Process the requests
+ * Compress and send an frame to the peer.
+ * Should be called with dev->tbusy == 1, having been set by the caller.
+ * That is, we use dev->tbusy as a lock to prevent reentry of this
+ * procedure.
*/
- switch (cmd) {
- case SIOCGPPPSTATS:
- error = ppp_dev_ioctl_stats (ppp, ifr, dev);
- break;
+static void
+ppp_send_frame(struct ppp *ppp, struct sk_buff *skb)
+{
+ int proto;
+ __u8 *data;
+ int count;
+ __u8 *p;
+ int ret;
- case SIOCGPPPCSTATS:
- error = ppp_dev_ioctl_comp_stats (ppp, ifr, dev);
+ CHECK_PPP_VOID();
+ data = skb->data;
+ count = skb->len;
+
+ /* dump the buffer */
+ if (ppp->flags & SC_LOG_OUTPKT)
+ ppp_print_buffer ("write frame", data, count);
+
+ /*
+ * Handle various types of protocol-specific compression
+ * and other processing, including:
+ * - VJ TCP header compression
+ * - updating LQR packets
+ * - updating CCP state on CCP packets
+ */
+ proto = PPP_PROTOCOL(data);
+ switch (proto) {
+ case PPP_IP:
+ if ((ppp->flags & SC_COMP_TCP) && ppp->slcomp != NULL)
+ skb = ppp_vj_compress(ppp, skb);
break;
- case SIOCGPPPVER:
- error = ppp_dev_ioctl_version (ppp, ifr);
+ case PPP_LQR:
+ /*
+ * Update the LQR frame with the current MIB information.
+ * This way the information is accurate and up-to-date.
+ */
+ if (count < 48)
+ break;
+ p = data + 40; /* Point to last two items. */
+ p = store_long(p, ppp->stats.ppp_opackets + 1);
+ p = store_long(p, ppp->stats.ppp_ooctects + count);
+ ++ppp->stats.ppp_olqrs;
break;
- default:
- error = -EINVAL;
+ case PPP_CCP:
+ /*
+ * Outbound compression control frames
+ */
+ ppp_proto_ccp(ppp, data + PPP_HDRLEN, count - PPP_HDRLEN, 0);
break;
}
- return error;
+ data = skb->data;
+ count = skb->len;
+
+ /*
+ * Compress the whole frame if possible.
+ */
+ if (((ppp->flags & SC_COMP_RUN) != 0) &&
+ (ppp->sc_xc_state != (void *) 0) &&
+ (proto != PPP_LCP) &&
+ (proto != PPP_CCP)) {
+ struct sk_buff *new_skb;
+ int new_count;
+
+ /* Allocate an skb for the compressed frame. */
+ new_skb = alloc_skb(ppp->mtu + PPP_HDRLEN, GFP_ATOMIC);
+ if (new_skb == NULL) {
+ printk(KERN_ERR "ppp_send_frame: no memory\n");
+ kfree_skb(skb);
+ ppp->dev.tbusy = 0;
+ return;
+ }
+
+ /* Compress the frame. */
+ new_count = (*ppp->sc_xcomp->compress)
+ (ppp->sc_xc_state, data, new_skb->data,
+ count, ppp->mtu + PPP_HDRLEN);
+
+ /* Did it compress? */
+ if (new_count > 0 && (ppp->flags & SC_CCP_UP)) {
+ skb_put(new_skb, new_count);
+ kfree_skb(skb);
+ skb = new_skb;
+ } else {
+ /*
+ * The frame could not be compressed, or it could not
+ * be sent in compressed form because CCP is down.
+ */
+ kfree_skb(new_skb);
+ }
+ }
+
+ /*
+ * Send the frame
+ */
+ ret = ppp_async_send(ppp, skb);
+ if (ret > 0) {
+ /* we can release the lock */
+ ppp->dev.tbusy = 0;
+ } else if (ret < 0) {
+ /* this can't happen, since the caller got the tbusy lock */
+ printk(KERN_ERR "ppp: ppp_async_send didn't accept pkt\n");
+ }
}
/*
- * Send an IP frame to the remote with vj header compression.
- *
- * 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.
+ * Apply VJ TCP header compression to a packet.
*/
-
-static int
-ppp_dev_xmit_ip (struct ppp *ppp, struct ppp_buffer *buf,
- __u8 *data, int len, enum NPmode npmode)
+static struct sk_buff *
+ppp_vj_compress(struct ppp *ppp, struct sk_buff *skb)
{
- int proto = PPP_IP;
- __u8 *hdr;
-/*
- * Branch on the type of processing for the IP frame.
- */
- switch (npmode) {
- case NPMODE_PASS:
- break;
+ __u8 *orig_data, *data;
+ struct sk_buff *new_skb;
+ int len, proto;
- 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;
+ new_skb = alloc_skb(skb->len, GFP_ATOMIC);
+ if (new_skb == NULL) {
+ printk(KERN_ERR "ppp: no memory for vj compression\n");
+ return skb;
+ }
- 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], ppp->name);
- return -1;
+ orig_data = data = skb->data + PPP_HDRLEN;
+ len = slhc_compress(ppp->slcomp, data, skb->len - PPP_HDRLEN,
+ new_skb->data + PPP_HDRLEN, &data,
+ (ppp->flags & SC_NO_TCP_CCID) == 0);
- default:
- if (ppp->flags & SC_DEBUG)
- printk (KERN_WARNING
- "ppp_dev_xmit: unknown npmode %d on %s\n",
- ppp->sc_npmode[NP_IP], ppp->name);
- return -1;
+ if (data == orig_data) {
+ /* Couldn't compress the data */
+ kfree_skb(new_skb);
+ return skb;
}
-/*
- * At this point, the buffer will be transmitted. There is no other exit.
- *
- * Try to compress the header.
- */
- if (ppp->flags & SC_COMP_TCP) {
- len = slhc_compress (ppp->slcomp, data, len,
- buf_base (ppp->cbuf) + PPP_HDRLEN,
- &data,
- (ppp->flags & SC_NO_TCP_CCID) == 0);
-
- if (data[0] & SL_TYPE_COMPRESSED_TCP) {
- proto = PPP_VJC_COMP;
- data[0] ^= SL_TYPE_COMPRESSED_TCP;
- } else {
- if (data[0] >= SL_TYPE_UNCOMPRESSED_TCP)
- proto = PPP_VJC_UNCOMP;
- data[0] = (data[0] & 0x0f) | 0x40;
- }
+
+ /* The data has been changed */
+ if (data[0] & SL_TYPE_COMPRESSED_TCP) {
+ proto = PPP_VJC_COMP;
+ data[0] ^= SL_TYPE_COMPRESSED_TCP;
+ } else {
+ if (data[0] >= SL_TYPE_UNCOMPRESSED_TCP)
+ proto = PPP_VJC_UNCOMP;
+ else
+ proto = PPP_IP;
+ data[0] = orig_data[0];
}
-/*
- * Send the frame
- */
- len += PPP_HDRLEN;
- hdr = data - PPP_HDRLEN;
- hdr[0] = PPP_ALLSTATIONS;
- hdr[1] = PPP_UI;
- hdr[2] = 0;
- hdr[3] = proto;
+ data = skb_put(new_skb, len + PPP_HDRLEN);
+ data[0] = PPP_ALLSTATIONS;
+ data[1] = PPP_UI;
+ data[2] = 0;
+ data[3] = proto;
- return ppp_dev_xmit_frame (ppp, buf, hdr, len);
+ kfree_skb(skb);
+ return new_skb;
+}
+
+static inline void
+ppp_send_frames(struct ppp *ppp)
+{
+ struct sk_buff *skb;
+
+ while (!test_and_set_bit(0, &ppp->dev.tbusy)) {
+ skb = skb_dequeue(&ppp->xmt_q);
+ if (skb == NULL) {
+ ppp->dev.tbusy = 0;
+ mark_bh(NET_BH);
+ break;
+ }
+ ppp_send_frame(ppp, skb);
+ }
}
/*
- * 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.
+ * Called from the hardware (tty) layer when it can accept
+ * another packet.
*/
-static int
-ppp_dev_xmit_other (struct device *dev, struct ppp *ppp,
- __u8 *data, int len, int proto)
+static void
+ppp_output_wakeup(struct ppp *ppp)
{
- __u8 *hdr;
+ CHECK_PPP_VOID();
+
+ if (!ppp->dev.tbusy) {
+ printk(KERN_ERR "ppp_output_wakeup called but tbusy==0\n");
+ return;
+ }
+ ppp->dev.tbusy = 0;
+ ppp_send_frames(ppp);
+}
+
/*
- * Send the frame
+ * Send a control frame (from pppd).
*/
- len += PPP_HDRLEN;
- hdr = data - PPP_HDRLEN;
-
- hdr[0] = PPP_ALLSTATIONS;
- hdr[1] = PPP_UI;
- hdr[2] = proto >> 8;
- hdr[3] = proto;
+static void
+ppp_send_ctrl(struct ppp *ppp, struct sk_buff *skb)
+{
+ CHECK_PPP_VOID();
- return ppp_dev_xmit_frame (ppp, ppp->wbuf, hdr, len);
+ /*
+ * Put the packet on the queue, then send as many as we can.
+ */
+ skb_queue_tail(&ppp->xmt_q, skb);
+ ppp_send_frames(ppp);
}
+
+/*************************************************************
+ * NETWORK OUTPUT
+ * This routine accepts requests from the network layer
+ * and attempts to deliver the packets.
+ *************************************************************/
/*
- * Send a frame to the remote.
+ * Send a frame to the peer.
+ * Returns 1 iff the frame was not accepted.
*/
-
static int
-ppp_dev_xmit (sk_buff *skb, struct device *dev)
+ppp_dev_xmit(struct sk_buff *skb, struct device *dev)
{
- int answer, len;
- __u8 *data;
- struct ppp *ppp = dev2ppp (dev);
- struct tty_struct *tty = ppp2tty (ppp);
-/*
- * just a little sanity check.
- */
- if (skb == NULL) {
- if (ppp->flags & SC_DEBUG)
- printk (KERN_WARNING "ppp_dev_xmit: null packet!\n");
+ struct ppp *ppp = dev2ppp(dev);
+ struct tty_struct *tty = ppp2tty(ppp);
+ enum NPmode npmode;
+ int proto;
+ unsigned char *hdr;
+
+ /* just a little sanity check. */
+ if (skb == NULL)
+ return 0;
+ if (skb->data == NULL) {
+ kfree_skb(skb);
return 0;
}
-/*
- * Avoid timing problem should tty hangup while data is queued to be sent
- */
+
+ /*
+ * Avoid timing problem should tty hangup while data is
+ * queued to be sent.
+ */
if (!ppp->inuse) {
- dev_kfree_skb (skb);
+ dev_kfree_skb(skb);
return 0;
}
-/*
- * Validate the tty interface
- */
+
+ /*
+ * 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);
- dev_kfree_skb (skb);
+ printk(KERN_ERR
+ "ppp_dev_xmit: %s not connected to a TTY!\n",
+ dev->name);
+ dev_kfree_skb(skb);
return 0;
}
-/*
- * Fetch the pointer to the data
- */
- len = skb->len;
- data = skb_data(skb);
- if (data == (__u8 *) 0) {
+ /*
+ * Work out the appropriate network-protocol mode for this packet.
+ */
+ npmode = NPMODE_PASS; /* default */
+ switch (ntohs(skb->protocol)) {
+ case ETH_P_IP:
+ proto = PPP_IP;
+ npmode = ppp->sc_npmode[NP_IP];
+ break;
+ case ETH_P_IPX:
+ proto = PPP_IPX;
+ npmode = ppp->sc_npmode[NP_IPX];
+ break;
+ case ETH_P_PPPTALK:
+ case ETH_P_ATALK:
+ proto = PPP_AT;
+ npmode = ppp->sc_npmode[NP_AT];
+ break;
+ default:
if (ppp->flags & SC_DEBUG)
- printk (KERN_CRIT "ppp_dev_xmit: %s Null skb data\n",
- dev->name);
- dev_kfree_skb (skb);
+ printk(KERN_INFO "%s: packet for unknown proto %x\n",
+ ppp->name, ntohs(skb->protocol));
+ dev_kfree_skb(skb);
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=%lu w=%lu\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_other (dev, ppp, data, len, PPP_IPX);
- break;
- case ETH_P_IP:
- answer = ppp_dev_xmit_ip (ppp, ppp->wbuf, data, len,
- ppp->sc_npmode[NP_IP]);
+ /*
+ * Drop, accept or reject the packet depending on the mode.
+ */
+ switch (npmode) {
+ case NPMODE_PASS:
break;
- default: /* All others have no support at this time. */
- dev_kfree_skb (skb);
+ 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);
+ dev_kfree_skb(skb);
+ return 0;
+
+ case NPMODE_ERROR:
+ case NPMODE_DROP:
+ if (ppp->flags & SC_DEBUG)
+ printk(KERN_DEBUG
+ "ppp_dev_xmit: dropping (npmode = %d) on %s\n",
+ npmode, ppp->name);
+ dev_kfree_skb(skb);
return 0;
}
-/*
- * This is the end of the transmission. Release the buffer if it was sent.
- */
- if (answer == 0) {
- /* packet queued OK */
- dev_kfree_skb (skb);
- } else {
- ppp->wbuf->locked = 0;
- if (answer < 0) {
- /* packet should be dropped */
- dev_kfree_skb (skb);
- answer = 0;
- } else {
- /* packet should be queued for later */
- dev->tbusy = 1;
+
+ /*
+ * The dev->tbusy field acts as a lock to allow only
+ * one packet to be processed at a time. If we can't
+ * get the lock, try again later.
+ */
+ if (test_and_set_bit(0, &dev->tbusy))
+ return 1;
+
+ /*
+ * Put the 4-byte PPP header on the packet.
+ * If there isn't room for it, we have to copy the packet.
+ */
+ if (skb_headroom(skb) < PPP_HDRLEN) {
+ struct sk_buff *new_skb;
+
+ new_skb = alloc_skb(skb->len + PPP_HDRLEN, GFP_ATOMIC);
+ if (new_skb == NULL) {
+ printk(KERN_ERR "%s: skb hdr alloc failed\n",
+ ppp->name);
+ dev_kfree_skb(skb);
+ dev->tbusy = 0;
+ return 0;
}
+ skb_reserve(new_skb, PPP_HDRLEN);
+ memcpy(skb_put(new_skb, skb->len), skb->data, skb->len);
+ dev_kfree_skb(skb);
+ skb = new_skb;
}
- return answer;
+
+ hdr = skb_push(skb, PPP_HDRLEN);
+ hdr[0] = PPP_ALLSTATIONS;
+ hdr[1] = PPP_UI;
+ hdr[2] = proto >> 8;
+ hdr[3] = proto;
+
+ ppp_send_frame(ppp, skb);
+ return 0;
}
/*
* Generate the statistic information for the /proc/net/dev listing.
*/
-
static struct net_device_stats *
ppp_dev_stats (struct device *dev)
{
@@ -3017,7 +2484,7 @@
/* Locate the previous instance of the PPP channel */
static struct ppp *
-ppp_find (int pid_value)
+ppp_find(int pid_value)
{
struct ppp *ppp;
@@ -3031,104 +2498,152 @@
return ppp;
}
-/* Collect hanged up channels */
-
-static void ppp_sync(void)
-{
- struct device *dev;
- struct ppp *ppp;
-
- rtnl_lock();
- for (ppp = ppp_list; ppp != 0; ppp = ppp->next) {
- if (!ppp->inuse) {
- dev = ppp2dev(ppp);
- if (dev->flags&IFF_UP)
- dev_close(dev);
- }
- }
- rtnl_unlock();
-}
-
-
/* allocate or create a PPP channel */
static struct ppp *
-ppp_alloc (void)
+ppp_alloc(void)
{
int if_num;
int status;
struct device *dev;
struct ppp *ppp;
- ppp_sync();
-
/* try to find an free device */
- if_num = 0;
for (ppp = ppp_list; ppp != 0; ppp = ppp->next) {
if (!test_and_set_bit(0, &ppp->inuse)) {
-
- /* Reregister device */
-
dev = ppp2dev(ppp);
- unregister_netdev (dev);
-
- if (register_netdev (dev)) {
- printk(KERN_DEBUG "cannot reregister ppp device\n");
- return NULL;
+ if (dev->flags & IFF_UP) {
+ clear_bit(0, &ppp->inuse);
+ continue;
}
- return ppp;
+ /* Reregister device */
+ unregister_netdev(dev);
+ if (register_netdev(dev) == 0)
+ return ppp;
+ printk(KERN_DEBUG "could not reregister ppp device\n");
+ /* leave inuse set in this case */
}
- ++if_num;
}
-/*
- * There are no available units, so make a new one.
- */
- ppp = (struct ppp *) kmalloc (sizeof(struct ppp), GFP_KERNEL);
- if (ppp == 0)
+
+ /*
+ * There are no available units, so make a new one.
+ */
+ ppp = (struct ppp *) kmalloc(sizeof(struct ppp), GFP_KERNEL);
+ if (ppp == 0) {
+ printk(KERN_ERR "ppp: struct ppp allocation failed\n");
return 0;
+ }
memset(ppp, 0, sizeof(*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;
- ppp->read_wait = NULL;
- ppp->write_wait = NULL;
+ ppp->magic = PPP_MAGIC;
+ ppp->next = NULL;
+ ppp->inuse = 1;
+ ppp->read_wait = NULL;
+ /*
+ * Make up a suitable name for this device
+ */
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;
+ dev->name = ppp->name;
+ if_num = dev_alloc_name(dev, "ppp%d");
+ if (if_num < 0) {
+ printk(KERN_ERR "ppp: dev_alloc_name failed (%d)\n", if_num);
+ kfree(ppp);
+ return 0;
+ }
+ ppp->line = if_num;
+ ppp->slcomp = NULL;
+
+ dev->next = NULL;
+ dev->init = ppp_init_dev;
+ dev->name = ppp->name;
+ 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);
+ printk(KERN_INFO "registered device %s\n", dev->name);
} else {
- printk (KERN_ERR
+ printk(KERN_ERR
"ppp_alloc - register_netdev(%s) = %d failure.\n",
- dev->name, status);
+ dev->name, status);
+ kfree(ppp);
ppp = NULL;
- /* This one will forever be busy as it is not initialized */
}
+
+ /* link this unit into our list */
+ if (ppp_list == 0)
+ ppp_list = ppp;
+ else
+ ppp_last->next = ppp;
+ ppp_last = ppp;
+
return ppp;
}
/*
- * Utility procedures to print a buffer in hex/ascii
+ * Initialize the generic parts of the ppp structure.
+ */
+static void
+ppp_generic_init(struct ppp *ppp)
+{
+ int indx;
+
+ ppp->flags = 0;
+ ppp->mtu = PPP_MTU;
+ ppp->mru = PPP_MRU;
+
+ skb_queue_head_init(&ppp->xmt_q);
+ skb_queue_head_init(&ppp->rcv_q);
+
+ ppp->last_xmit = jiffies;
+ ppp->last_recv = jiffies;
+
+ /* clear statistics */
+ memset(&ppp->stats, 0, sizeof (struct pppstat));
+ memset(&ppp->estats, 0, sizeof(struct net_device_stats));
+
+ /* PPP compression data */
+ ppp->sc_xc_state = NULL;
+ ppp->sc_rc_state = NULL;
+
+ for (indx = 0; indx < NUM_NP; ++indx)
+ ppp->sc_npmode[indx] = NPMODE_PASS;
+}
+
+/*
+ * Called to clean up the generic parts of the ppp structure.
*/
+static void
+ppp_release(struct ppp *ppp)
+{
+ struct sk_buff *skb;
+
+ CHECK_PPP_MAGIC(ppp);
+
+ if (ppp->flags & SC_DEBUG)
+ printk(KERN_DEBUG "%s released\n", ppp->name);
+
+ ppp_ccp_closed(ppp);
+
+ /* Ensure that the pppd process is not hanging on select()/poll() */
+ wake_up_interruptible(&ppp->read_wait);
+
+ if (ppp->slcomp) {
+ slhc_free(ppp->slcomp);
+ ppp->slcomp = NULL;
+ }
+
+ while ((skb = skb_dequeue(&ppp->rcv_q)) != NULL)
+ kfree_skb(skb);
+ while ((skb = skb_dequeue(&ppp->xmt_q)) != NULL)
+ kfree_skb(skb);
+}
+/*
+ * Utility procedures to print a buffer in hex/ascii
+ */
static void
ppp_print_hex (register __u8 * out, const __u8 * in, int count)
{
@@ -3163,18 +2678,18 @@
}
static void
-ppp_print_buffer (const __u8 * name, const __u8 * buf, int count)
+ppp_print_buffer (const char *name, const __u8 *buf, int count)
{
__u8 line[44];
- if (name != (__u8 *) NULL)
- printk (KERN_DEBUG "ppp: %s, count = %d\n", name, count);
+ if (name != NULL)
+ printk(KERN_DEBUG "ppp: %s, count = %d\n", name, count);
while (count > 8) {
memset (line, 32, 44);
ppp_print_hex (line, buf, 8);
ppp_print_char (&line[8 * 3], buf, 8);
- printk (KERN_DEBUG "%s\n", line);
+ printk(KERN_DEBUG "%s\n", line);
count -= 8;
buf += 8;
}
@@ -3183,7 +2698,7 @@
memset (line, 32, 44);
ppp_print_hex (line, buf, count);
ppp_print_char (&line[8 * 3], buf, count);
- printk (KERN_DEBUG "%s\n", line);
+ printk(KERN_DEBUG "%s\n", line);
}
}
@@ -3225,7 +2740,8 @@
struct compressor_link *new;
unsigned long flags;
- new = (struct compressor_link *) kmalloc (sizeof (struct compressor_link), GFP_KERNEL);
+ new = (struct compressor_link *)
+ kmalloc (sizeof (struct compressor_link), GFP_KERNEL);
if (new == (struct compressor_link *) 0)
return 1;
@@ -3286,63 +2802,49 @@
/* register our line disciplines */
status = ppp_first_time();
if (status != 0)
- printk (KERN_INFO
- "PPP: ppp_init() failure %d\n", status);
- return (status);
+ printk(KERN_INFO "PPP: ppp_init() failure %d\n", status);
+
+ return status;
}
void
cleanup_module(void)
{
int status;
- struct device *dev;
struct ppp *ppp, *next_ppp;
- int busy_flag = 0;
-/*
- * Ensure that the devices are not in operation.
- */
- for (ppp = ppp_list; ppp != 0; ppp = ppp->next) {
- if (ppp->inuse && ppp->tty != NULL) {
- busy_flag = 1;
- break;
- }
+ int busy = 0;
- dev = ppp2dev (ppp);
- if (dev->start || dev->flags & IFF_UP) {
- busy_flag = 1;
- break;
- }
- }
-/*
- * Ensure that there are no compressor modules registered
- */
- if (ppp_compressors != NULL)
- busy_flag = 1;
+ /*
+ * Ensure that the devices are not in operation.
+ */
+ for (ppp = ppp_list; ppp != 0; ppp = ppp->next) {
+ CHECK_PPP_MAGIC(ppp);
+ if (ppp->inuse || (ppp->dev.flags & IFF_UP))
+ ++busy;
+ }
+ if (busy)
+ printk(KERN_CRIT "PPP: removing despite %d units in use!\n",
+ busy);
- if (busy_flag) {
- printk (KERN_INFO
- "PPP: device busy, remove delayed\n");
- return;
- }
-/*
- * Release the tty registration of the line discipline so that no new entries
- * may be created.
- */
+ /*
+ * Release the tty registration of the line discipline so that
+ * ttys can no longer be put into PPP line discipline.
+ */
status = tty_register_ldisc (N_PPP, NULL);
if (status != 0)
- printk (KERN_INFO
- "PPP: Unable to unregister ppp line discipline "
- "(err = %d)\n", status);
+ printk(KERN_ERR
+ "PPP: Unable to unregister ppp line discipline "
+ "(err = %d)\n", status);
else
- printk (KERN_INFO
+ printk(KERN_INFO
"PPP: ppp line discipline successfully unregistered\n");
-/*
- * De-register the devices so that there is no problem with them
- */
+
+ /*
+ * De-register the devices so that there is no problem with them
+ */
for (ppp = ppp_list; ppp != 0; ppp = next_ppp) {
next_ppp = ppp->next;
- ppp_release (ppp);
- unregister_netdev (&ppp->dev);
+ unregister_netdev(&ppp->dev);
kfree (ppp);
}
}
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen, slshen@lbl.gov