-/* PPP for Linux
- *
- * Michael Callahan <callahan@maths.ox.ac.uk>
- * Al Longyear <longyear@netcom.com>
- * Extensively rewritten by Paul Mackerras <paulus@cs.anu.edu.au>
- *
- * ==FILEVERSION 990910==
- *
- * NOTE TO MAINTAINERS:
- * If you modify this file at all, please set the number above to the
- * date of the modification as YYMMDD (year month day).
- * ppp.c is shipped with a PPP distribution as well as with the kernel;
- * if everyone increases the FILEVERSION number above, then scripts
- * can do the right thing when deciding whether to install a new ppp.c
- * file. Don't change the format of that line otherwise, so the
- * installation script can recognize it.
- */
-
-/*
- Sources:
-
- slip.c
-
- RFC1331: The Point-to-Point Protocol (PPP) for the Transmission of
- Multi-protocol Datagrams over Point-to-Point Links
-
- RFC1332: IPCP
-
- ppp-2.0
-
- Flags for this module (any combination is acceptable for testing.):
-
- OPTIMIZE_FLAG_TIME - Number of jiffies to force sending of leading flag
- character. This is normally set to ((HZ * 3) / 2).
- This is 1.5 seconds. If zero then the leading
- flag is always sent.
-
- CHECK_CHARACTERS - Enable the checking on all received characters for
- 8 data bits, no parity. This adds a small amount of
- processing for each received character.
-*/
-
-#define OPTIMIZE_FLAG_TIME ((HZ * 3)/2)
-#define CHECK_CHARACTERS 1
-
-#define PPP_MAX_RCV_QLEN 32 /* max # frames we queue up for pppd */
-
-/* $Id: ppp.c,v 1.33 1999/12/23 01:48:45 paulus Exp $ */
-
-#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/interrupt.h>
-#include <linux/ptrace.h>
-
-/* a macro to generate linux version number codes */
-#define VERSION(major,minor,patch) (((((major)<<8)+(minor))<<8)+(patch))
-
-#if LINUX_VERSION_CODE < VERSION(2,1,14)
-#include <linux/ioport.h>
-#endif
-
-#if LINUX_VERSION_CODE >= VERSION(2,1,23)
-#include <linux/poll.h>
-#endif
-
-#include <linux/in.h>
-#include <linux/malloc.h>
-#include <linux/tty.h>
-#include <linux/errno.h>
-#include <linux/sched.h> /* to get the struct task_struct */
-#include <linux/string.h> /* used in new tty drivers */
-#include <linux/signal.h> /* used in new tty drivers */
-#include <asm/system.h>
-#include <asm/bitops.h>
-#include <linux/if.h>
-#include <linux/if_ether.h>
-#include <linux/netdevice.h>
-#include <linux/skbuff.h>
-#include <linux/inet.h>
-#include <linux/ioctl.h>
-#include <linux/ip.h>
-#include <linux/tcp.h>
-#include <linux/if_arp.h>
-#include <net/slhc_vj.h>
-
-#define fcstab ppp_crc16_table /* Name of the table in the kernel */
-#include <linux/ppp_defs.h>
-
-#include <linux/socket.h>
-#include <linux/if_ppp.h>
-#include <linux/if_pppvar.h>
-#include <linux/ppp-comp.h>
-
-#ifdef CONFIG_KMOD
-#include <linux/kmod.h>
-#endif
-#ifdef CONFIG_KERNELD
-#include <linux/kerneld.h>
-#endif
-
-#undef PPP_VERSION
-#define PPP_VERSION "2.3.11"
-
-#if LINUX_VERSION_CODE >= VERSION(2,1,4)
-
-#if LINUX_VERSION_CODE >= VERSION(2,1,5)
-#include <asm/uaccess.h>
-#else
-#include <asm/segment.h>
-#endif
-
-#define GET_USER get_user
-#define PUT_USER put_user
-#define COPY_FROM_USER copy_from_user
-#define COPY_TO_USER copy_to_user
-
-#else /* 2.0.x and 2.1.x before 2.1.4 */
-
-#define GET_USER(val, src) \
- (verify_area(VERIFY_READ, src, sizeof(*src))? -EFAULT: \
- ((val) = get_user(src), 0))
-#define PUT_USER(val, dst) \
- (verify_area(VERIFY_WRITE, dst, sizeof(*dst))? -EFAULT: \
- (put_user(val, dst), 0))
-#define COPY_FROM_USER(dst, src, size) \
- (verify_area(VERIFY_READ, src, size)? -EFAULT: \
- (memcpy_fromfs(dst, src, size), 0))
-#define COPY_TO_USER(dst, src, size) \
- (verify_area(VERIFY_WRITE, dst, size)? -EFAULT: \
- (memcpy_tofs(dst, src, size), 0))
-
-#endif /* < 2.1.4 */
-
-#if LINUX_VERSION_CODE < VERSION(2,1,37)
-#define test_and_set_bit(nr, addr) set_bit(nr, addr)
-#endif
-
-#if LINUX_VERSION_CODE < VERSION(2,1,25)
-#define net_device_stats enet_statistics
-#endif
-
-#if LINUX_VERSION_CODE < VERSION(2,1,57)
-#define signal_pending(tsk) ((tsk)->signal & ~(tsk)->blocked)
-#endif
-
-#if LINUX_VERSION_CODE < VERSION(2,1,60)
-typedef int rw_ret_t;
-typedef unsigned int rw_count_t;
-#else
-typedef ssize_t rw_ret_t;
-typedef size_t rw_count_t;
-#endif
-
-#if LINUX_VERSION_CODE < VERSION(2,1,86)
-#define KFREE_SKB(s) dev_kfree_skb((s), FREE_WRITE)
-#else
-#define KFREE_SKB(s) kfree_skb(s)
-#endif
-
-#if LINUX_VERSION_CODE < VERSION(2,1,15)
-#define LIBERATE_SKB(s) ((s)->free = 1)
-#else
-#define LIBERATE_SKB(s) do { } while (0)
-#endif
-
-#if LINUX_VERSION_CODE < VERSION(2,1,95)
-#define SUSER() suser()
-#else
-#define SUSER() capable(CAP_NET_ADMIN)
-#endif
-
-#if LINUX_VERSION_CODE < VERSION(2,2,0)
-#define wmb() mb()
-#endif
-
-/*
- * Local functions
- */
-
-static int ppp_register_compressor (struct compressor *cp);
-static void ppp_unregister_compressor (struct compressor *cp);
-
-static void ppp_async_init(struct ppp *ppp);
-static void ppp_async_release(struct ppp *ppp);
-static int ppp_tty_sync_push(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_sync_send(struct ppp *, struct sk_buff *);
-static void ppp_tty_flush_output(struct ppp *);
-
-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 void ppp_send_frames(struct ppp *ppp);
-static struct sk_buff *ppp_vj_compress(struct ppp *ppp, struct sk_buff *skb);
-
-static struct ppp *ppp_find (int pid_value);
-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
-#endif
-
-/*
- * Parameters which may be changed via insmod.
- */
-
-static int flag_time = OPTIMIZE_FLAG_TIME;
-#if LINUX_VERSION_CODE >= VERSION(2,1,19)
-MODULE_PARM(flag_time, "i");
-#endif
-
-#define CHECK_PPP_MAGIC(ppp) do { \
- if (ppp->magic != PPP_MAGIC) { \
- 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__); \
- return a; \
- } \
-} while (0)
-#define CHECK_PPP_VOID() do { \
- CHECK_PPP_MAGIC(ppp); \
- if (!ppp->inuse) { \
- printk(ppp_warning, __LINE__); \
- return; \
- } \
-} while (0)
-
-#define tty2ppp(tty) ((struct ppp *) ((tty)->disc_data))
-#define dev2ppp(dev) ((struct ppp *) ((dev)->priv))
-#define ppp2tty(ppp) ((ppp)->tty)
-#define ppp2dev(ppp) (&(ppp)->dev)
-
-static struct ppp *ppp_list = NULL;
-static struct ppp *ppp_last = NULL;
-
-/* 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;
-
-#if LINUX_VERSION_CODE < VERSION(2,1,18)
-static struct symbol_table ppp_syms = {
-#include <linux/symtab_begin.h>
- X(ppp_register_compressor),
- X(ppp_unregister_compressor),
-#include <linux/symtab_end.h>
-};
-#else
-EXPORT_SYMBOL(ppp_register_compressor);
-EXPORT_SYMBOL(ppp_unregister_compressor);
-#endif
-
-/*************************************************************
- * LINE DISCIPLINE SUPPORT
- * The following code implements the PPP line discipline
- * and supports using PPP on an async serial line.
- *************************************************************/
-
-#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)))
-
-/*
- * TTY callbacks
- */
-
-static rw_ret_t ppp_tty_read(struct tty_struct *, struct file *, __u8 *,
- rw_count_t);
-static rw_ret_t ppp_tty_write(struct tty_struct *, struct file *, const __u8 *,
- rw_count_t);
-static int ppp_tty_ioctl(struct tty_struct *, struct file *, unsigned int,
- unsigned long);
-#if LINUX_VERSION_CODE < VERSION(2,1,23)
-static int ppp_tty_select(struct tty_struct *tty, struct inode *inode,
- struct file *filp, int sel_type, select_table * wait);
-#else
-static unsigned int ppp_tty_poll(struct tty_struct *tty, struct file *filp,
- poll_table * wait);
-#endif
-static int ppp_tty_open (struct tty_struct *);
-static void ppp_tty_close (struct tty_struct *);
-static int ppp_tty_room (struct tty_struct *tty);
-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] =
-{
- 0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf,
- 0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7,
- 0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e,
- 0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876,
- 0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd,
- 0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5,
- 0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c,
- 0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974,
- 0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb,
- 0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3,
- 0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a,
- 0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72,
- 0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9,
- 0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1,
- 0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738,
- 0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70,
- 0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7,
- 0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff,
- 0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036,
- 0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e,
- 0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5,
- 0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd,
- 0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134,
- 0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c,
- 0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3,
- 0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb,
- 0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232,
- 0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a,
- 0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1,
- 0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9,
- 0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330,
- 0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78
-};
-#if LINUX_VERSION_CODE >= VERSION(2,1,18)
-EXPORT_SYMBOL(ppp_crc16_table);
-#endif
-
-#ifdef CHECK_CHARACTERS
-static __u32 paritytab[8] =
-{
- 0x96696996, 0x69969669, 0x69969669, 0x96696996,
- 0x69969669, 0x96696996, 0x96696996, 0x69969669
-};
-#endif
-
-/*
- * This procedure is called at initialization time to register
- * the PPP line discipline.
- */
-static int
-ppp_first_time(void)
-{
- static struct tty_ldisc ppp_ldisc;
- int status;
-
- 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");
-#endif
-
- /*
- * Register the tty discipline
- */
- (void) memset (&ppp_ldisc, 0, sizeof (ppp_ldisc));
- ppp_ldisc.magic = TTY_LDISC_MAGIC;
-#if LINUX_VERSION_CODE >= VERSION(2,1,28)
- ppp_ldisc.name = "ppp";
-#endif
- ppp_ldisc.open = ppp_tty_open;
- ppp_ldisc.close = ppp_tty_close;
- ppp_ldisc.read = ppp_tty_read;
- ppp_ldisc.write = ppp_tty_write;
- ppp_ldisc.ioctl = ppp_tty_ioctl;
-#if LINUX_VERSION_CODE < VERSION(2,1,23)
- ppp_ldisc.select = ppp_tty_select;
-#else
- ppp_ldisc.poll = ppp_tty_poll;
-#endif
- ppp_ldisc.receive_room = ppp_tty_room;
- ppp_ldisc.receive_buf = ppp_tty_receive;
- ppp_ldisc.write_wakeup = ppp_tty_wakeup;
-
- status = tty_register_ldisc (N_PPP, &ppp_ldisc);
- if (status == 0)
- printk(KERN_INFO "PPP line discipline registered.\n");
- else
- printk(KERN_ERR "error registering line discipline: %d\n",
- status);
- return status;
-}
-
-
-#ifndef MODULE
-/*
- * Called at boot time if the PPP driver is compiled into the kernel.
- */
-int
-ppp_init(struct device *dev)
-{
- static int first_time = 1;
- int answer = 0;
-
- if (first_time) {
- first_time = 0;
- answer = ppp_first_time();
-#if LINUX_VERSION_CODE < VERSION(2,1,18)
- if (answer == 0)
- (void) register_symtab(&ppp_syms);
-#endif
- }
- if (answer == 0)
- answer = -ENODEV;
- return answer;
-}
-#endif
-
-/*
- * Initialize the async-specific parts of the ppp structure.
- */
-static void
-ppp_async_init(struct ppp *ppp)
-{
- ppp->escape = 0;
- ppp->toss = 0xE0;
- ppp->tty_pushing = 0;
-
- 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;
-
- ppp->tpkt = NULL;
- ppp->tfcs = PPP_INITFCS;
- ppp->optr = ppp->obuf;
- ppp->olim = ppp->obuf;
-
- ppp->rpkt = NULL;
- ppp->rfcs = PPP_INITFCS;
-
- ppp->tty = NULL;
- ppp->backup_tty = NULL;
-
- ppp->bytes_sent = 0;
- ppp->bytes_rcvd = 0;
-}
-
-/*
- * Clean up the async-specific parts of the ppp structure.
- */
-static void
-ppp_async_release(struct ppp *ppp)
-{
- struct sk_buff *skb;
-
- if ((skb = ppp->rpkt) != NULL)
- KFREE_SKB(skb);
- ppp->rpkt = NULL;
- if ((skb = ppp->tpkt) != NULL)
- KFREE_SKB(skb);
- ppp->tpkt = NULL;
-}
-
-/*
- * TTY callback.
- *
- * Called when the tty discipline is switched to PPP.
- */
-
-static int
-ppp_tty_open (struct tty_struct *tty)
-{
- 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);
-
- } else {
- ppp = ppp_alloc();
- if (ppp == NULL) {
- printk(KERN_ERR "ppp_alloc failed\n");
- return -ENFILE;
- }
-
- /*
- * Initialize the control block
- */
- ppp_generic_init(ppp);
- ppp_async_init(ppp);
-
- MOD_INC_USE_COUNT;
- }
-
- tty->disc_data = ppp;
- ppp->tty = tty;
-
- /*
- * Flush any pending characters in the driver
- */
- if (tty->driver.flush_buffer)
- tty->driver.flush_buffer (tty);
-
- return ppp->line;
-}
-
-/*
- * 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_tty_close (struct tty_struct *tty)
-{
- struct ppp *ppp = tty2ppp(tty);
-
- 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;
- if (ppp_tty_push(ppp))
- ppp_output_wakeup(ppp);
- wake_up_interruptible(&ppp->read_wait);
- } else {
- ppp->tty = 0;
- ppp->sc_xfer = 0;
- if (ppp->flags & SC_DEBUG)
- printk(KERN_INFO "ppp: channel %s closing.\n",
- ppp2dev(ppp)->name);
-
- ppp_async_release(ppp);
- ppp_release(ppp);
- MOD_DEC_USE_COUNT;
- }
-}
-
-/*
- * Read a PPP frame from the rcv_q list,
- * waiting if necessary
- */
-static rw_ret_t
-ppp_tty_read(struct tty_struct *tty, struct file *file, __u8 * buf,
- rw_count_t nr)
-{
- struct ppp *ppp = tty2ppp (tty);
- struct sk_buff *skb;
- rw_ret_t len, err;
-
- /*
- * Validate the pointers
- */
- if (!ppp)
- return -EIO;
- CHECK_PPP(-ENXIO);
-
- /*
- * Before we attempt to write the frame to the user, ensure that the
- * user has access to the pages for the total buffer length.
- */
- err = verify_area(VERIFY_WRITE, buf, nr);
- if (err != 0)
- return (err);
-
- /*
- * 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;
-
- skb = skb_dequeue(&ppp->rcv_q);
- if (skb != 0)
- break;
-
- /*
- * If no frame is available, return -EAGAIN or wait.
- */
- err = -EAGAIN;
- if (file->f_flags & O_NONBLOCK)
- break;
-
- 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_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;
- }
-
- /*
- * Copy the received data from the buffer to the caller's area.
- */
- err = len;
- if (COPY_TO_USER(buf, skb->data, len))
- err = -EFAULT;
-
-out:
- KFREE_SKB(skb);
- return err;
-}
-
-/*
- * Writing to a tty in ppp line discipline sends a PPP frame.
- * Used by pppd to send control packets (LCP, etc.).
- */
-static rw_ret_t
-ppp_tty_write(struct tty_struct *tty, struct file *file, const __u8 * data,
- rw_count_t count)
-{
- struct ppp *ppp = tty2ppp (tty);
- __u8 *new_data;
- struct sk_buff *skb;
-
- /*
- * Verify the pointers.
- */
- if (!ppp)
- return -EIO;
-
- if (ppp->magic != PPP_MAGIC)
- return -EIO;
-
- 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.
- */
- skb = alloc_skb(count, GFP_KERNEL);
- if (skb == NULL) {
- printk(KERN_ERR "ppp_tty_write: no memory\n");
- return 0;
- }
- LIBERATE_SKB(skb);
- new_data = skb_put(skb, count);
-
- /*
- * Retrieve the user's buffer
- */
- if (COPY_FROM_USER(new_data, data, count)) {
- KFREE_SKB(skb);
- return -EFAULT;
- }
-
- /*
- * Send the frame
- */
- ppp_send_ctrl(ppp, skb);
-
- return (rw_ret_t) count;
-}
-
-/*
- * 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 int
-ppp_tty_ioctl (struct tty_struct *tty, struct file * file,
- unsigned int param2, unsigned long param3)
-{
- struct ppp *ppp = tty2ppp (tty);
- register int temp_i = 0;
- int error = -EFAULT;
-
- /*
- * Verify the status of the PPP device.
- */
- if (!ppp || ppp->magic != PPP_MAGIC || !ppp->inuse)
- return -ENXIO;
-
- /*
- * The user must have an euid of root to do these requests.
- */
- if (!SUSER())
- return -EPERM;
-
- 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;
-
- 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;
-
- 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;
- error = 0;
- break;
-
- case PPPIOCSXASYNCMAP:
- /*
- * Set the map of characters to be escaped on transmission.
- */
- {
- __u32 temp_tbl[8];
-
- if (COPY_FROM_USER(temp_tbl, (void *) param3,
- sizeof (temp_tbl)))
- break;
-
- temp_tbl[1] = 0x00000000;
- temp_tbl[2] &= ~0x40000000;
- temp_tbl[3] |= 0x60000000;
-
- memcpy(ppp->xmit_async_map, temp_tbl,
- sizeof (ppp->xmit_async_map));
-
- if (ppp->flags & SC_DEBUG)
- printk(KERN_INFO
- "ppp_tty_ioctl: set xasyncmap\n");
- error = 0;
- }
- break;
-
- 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;
-
- 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 TCFLSH:
- /*
- * Flush our buffers, then call the generic code to
- * flush the serial port's buffer.
- */
- if (param3 == TCIFLUSH || param3 == TCIOFLUSH) {
- struct sk_buff *skb;
- while ((skb = skb_dequeue(&ppp->rcv_q)) != NULL)
- KFREE_SKB(skb);
- }
- if (param3 == TCIOFLUSH || param3 == TCOFLUSH)
- ppp_tty_flush_output(ppp);
- error = n_tty_ioctl (tty, file, param2, param3);
- break;
-
- case FIONREAD:
- /*
- * Returns how many bytes are available for a read().
- */
- {
- unsigned long flags;
- struct sk_buff *skb;
- int count = 0;
-
- 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;
- error = 0;
- }
- break;
-
- default:
- /*
- * All other ioctl() events will come here.
- */
- error = ppp_ioctl(ppp, param2, param3);
- break;
- }
- return error;
-}
-
-/*
- * TTY callback.
- *
- * Process the select() or poll() statement for the PPP device.
- */
-
-#if LINUX_VERSION_CODE < VERSION(2,1,23)
-static int
-ppp_tty_select(struct tty_struct *tty, struct inode *inode,
- struct file *filp, int sel_type, select_table * wait)
-{
- struct ppp *ppp = tty2ppp(tty);
- int result = 1;
-
- /*
- * Verify the status of the PPP device.
- */
- if (!ppp || tty != ppp->tty)
- return -EBADF;
-
- CHECK_PPP(-EBADF);
-
- switch (sel_type) {
- case SEL_IN:
- /* The fd is readable if the receive queue isn't empty. */
- if (skb_peek(&ppp->rcv_q) != NULL)
- break;
- /* fall through */
- case SEL_EX:
- /* Check for exceptions or read errors. */
- /* Is this a pty link and the remote disconnected? */
- if (tty->flags & (1 << TTY_OTHER_CLOSED))
- break;
-
- /* Is this a local link and the modem disconnected? */
- if (tty_hung_up_p (filp))
- break;
-
- select_wait(&ppp->read_wait, wait);
- result = 0;
- break;
-
- case SEL_OUT:
- /* The fd is always writable. */
- break;
- }
- return result;
-}
-
-#else /* 2.1.23 or later */
-
-static unsigned int
-ppp_tty_poll(struct tty_struct *tty, struct file *filp, poll_table * wait)
-{
- struct ppp *ppp = tty2ppp(tty);
- unsigned int mask = 0;
-
- if (ppp && ppp->magic == PPP_MAGIC && tty == ppp->tty) {
- CHECK_PPP(0);
-
- poll_wait(filp, &ppp->read_wait, wait);
-
- 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;
- }
- return mask;
-}
-#endif /* >= 2.1.23 */
-
-/*
- * 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 void
-ppp_tty_wakeup (struct tty_struct *tty)
-{
- 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);
-}
-
-/*
- * Send a packet to the peer over a synchronous tty line.
- * All encoding and FCS are handled by hardware.
- * Addr/Ctrl and Protocol field compression implemented.
- * 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
-ppp_sync_send(struct ppp *ppp, struct sk_buff *skb)
-{
- unsigned char *data;
- int islcp;
-
- CHECK_PPP(0);
-
- if (ppp->tpkt != NULL)
- return -1;
- ppp->tpkt = skb;
-
- data = ppp->tpkt->data;
-
- /*
- * 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;
-
- /* only reset idle time for data packets */
- if (PPP_PROTOCOL(data) < 0x8000)
- ppp->last_xmit = jiffies;
- ++ppp->stats.ppp_opackets;
- ppp->stats.ppp_ooctects += ppp->tpkt->len;
-
- if ( !(data[2]) && (ppp->flags & SC_COMP_PROT) ) {
- /* compress protocol field */
- data[2] = data[1];
- data[1] = data[0];
- skb_pull(ppp->tpkt,1);
- data = ppp->tpkt->data;
- }
-
- /*
- * Do address/control compression
- */
- if ((ppp->flags & SC_COMP_AC) && !islcp
- && PPP_ADDRESS(data) == PPP_ALLSTATIONS
- && PPP_CONTROL(data) == PPP_UI) {
- /* strip addr and control field */
- skb_pull(ppp->tpkt,2);
- }
-
- return ppp_tty_sync_push(ppp);
-}
-
-/*
- * Push a synchronous frame out to the tty.
- * Returns 1 if frame accepted (or discarded), 0 otherwise.
- */
-static int
-ppp_tty_sync_push(struct ppp *ppp)
-{
- int sent;
- struct tty_struct *tty = ppp2tty(ppp);
- unsigned long flags;
-
- CHECK_PPP(0);
-
- if (ppp->tpkt == NULL)
- return 0;
-
- /* prevent reentrancy with tty_pushing flag */
- save_flags(flags);
- cli();
- if (ppp->tty_pushing) {
- /* record wakeup attempt so we don't lose */
- /* a wakeup call while doing push processing */
- ppp->woke_up=1;
- restore_flags(flags);
- return 0;
- }
- ppp->tty_pushing = 1;
- restore_flags(flags);
-
- if (tty == NULL || tty->disc_data != (void *) ppp)
- goto flush;
-
- for(;;){
- ppp->woke_up=0;
-
- /* Note: Sync driver accepts complete frame or nothing */
- tty->flags |= (1 << TTY_DO_WRITE_WAKEUP);
- sent = tty->driver.write(tty, 0, ppp->tpkt->data, ppp->tpkt->len);
- if (sent < 0) {
- /* write error (possible loss of CD) */
- /* record error and discard current packet */
- ppp->stats.ppp_oerrors++;
- break;
- }
- ppp->stats.ppp_obytes += sent;
- if (sent < ppp->tpkt->len) {
- /* driver unable to accept frame just yet */
- save_flags(flags);
- cli();
- if (ppp->woke_up) {
- /* wake up called while processing */
- /* try to send the frame again */
- restore_flags(flags);
- continue;
- }
- /* wait for wakeup callback to try send again */
- ppp->tty_pushing = 0;
- restore_flags(flags);
- return 0;
- }
- break;
- }
-flush:
- /* done with current packet (sent or discarded) */
- KFREE_SKB(ppp->tpkt);
- ppp->tpkt = 0;
- ppp->tty_pushing = 0;
- return 1;
-}
-
-/*
- * 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
-ppp_async_send(struct ppp *ppp, struct sk_buff *skb)
-{
- CHECK_PPP(0);
-
- ppp_tty_push(ppp);
-
- if (ppp->tpkt != NULL)
- return -1;
- ppp->tpkt = skb;
- ppp->tpkt_pos = 0;
-
- return ppp_tty_push(ppp);
-}
-
-/*
- * Push as much data as possible out to the tty.
- * Returns 1 if we finished encoding the current frame, 0 otherwise.
- */
-static int
-ppp_tty_push(struct ppp *ppp)
-{
- int avail, sent, done = 0;
- struct tty_struct *tty = ppp2tty(ppp);
-
- if (ppp->flags & SC_SYNC)
- return ppp_tty_sync_push(ppp);
-
- CHECK_PPP(0);
- if (ppp->tty_pushing) {
- ppp->woke_up = 1;
- return 0;
- }
- if (tty == NULL || tty->disc_data != (void *) ppp)
- goto flush;
- while (ppp->optr < ppp->olim || ppp->tpkt != 0) {
- ppp->tty_pushing = 1;
- mb();
- ppp->woke_up = 0;
- 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) {
- wmb();
- ppp->tty_pushing = 0;
- mb();
- if (ppp->woke_up)
- continue;
- return done;
- }
- }
- if (ppp->tpkt != 0)
- done = ppp_async_encode(ppp);
- wmb();
- ppp->tty_pushing = 0;
- }
- return done;
-
-flush:
- ppp->tty_pushing = 1;
- mb();
- ppp->stats.ppp_oerrors++;
- if (ppp->tpkt != 0) {
- KFREE_SKB(ppp->tpkt);
- ppp->tpkt = 0;
- done = 1;
- }
- ppp->optr = ppp->olim;
- wmb();
- ppp->tty_pushing = 0;
- return done;
-}
-
-/*
- * 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
-ppp_async_encode(struct ppp *ppp)
-{
- int fcs, i, count, c;
- unsigned char *buf, *buflim;
- unsigned char *data;
- int islcp;
-
- CHECK_PPP(0);
-
- 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;
- }
- *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;
-}
-
-/*
- * Flush output from our internal buffers.
- * Called for the TCFLSH ioctl.
- */
-static void
-ppp_tty_flush_output(struct ppp *ppp)
-{
- struct sk_buff *skb;
- int done = 0;
-
- while ((skb = skb_dequeue(&ppp->xmt_q)) != NULL)
- KFREE_SKB(skb);
- ppp->tty_pushing = 1;
- mb();
- ppp->optr = ppp->olim;
- if (ppp->tpkt != NULL) {
- KFREE_SKB(ppp->tpkt);
- ppp->tpkt = 0;
- done = 1;
- }
- wmb();
- ppp->tty_pushing = 0;
- if (done)
- ppp_output_wakeup(ppp);
-}
-
-/*
- * 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
-ppp_tty_room (struct tty_struct *tty)
-{
- return 65536; /* We can handle an infinite amount of data. :-) */
-}
-
-/*
- * Callback function when data is available at the tty driver.
- */
-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;
-
- 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);
-
- ppp->stats.ppp_ibytes += count;
- skb = ppp->rpkt;
-
- if ( ppp->flags & SC_SYNC ) {
- /* synchronous mode */
-
- if (ppp->toss==0xE0) {
- /* this is the 1st frame, reset vj comp */
- ppp_receive_error(ppp);
- ppp->toss = 0;
- }
-
- /*
- * Allocate an skbuff for frame.
- * The 128 is room for VJ header expansion.
- */
-
- if (skb == NULL)
- skb = dev_alloc_skb(ppp->mru + 128 + PPP_HDRLEN);
-
- if (skb == NULL) {
- if (ppp->flags & SC_DEBUG)
- printk(KERN_DEBUG "couldn't "
- "alloc skb for recv\n");
- } else {
- LIBERATE_SKB(skb);
- /*
- * Decompress A/C and protocol compression here.
- */
- p = skb_put(skb, 2);
- p[0] = PPP_ALLSTATIONS;
- p[1] = PPP_UI;
- if (*data == PPP_ALLSTATIONS) {
- data += 2;
- count -= 2;
- }
- if ((*data & 1) != 0) {
- p = skb_put(skb, 1);
- p[0] = 0;
- }
-
- /* copy frame to socket buffer */
- p = skb_put(skb, count);
- memcpy(p,data,count);
-
- /*
- * Check if we've overflowed the MRU
- */
- if (skb->len >= ppp->mru + PPP_HDRLEN + 2
- || skb_tailroom(skb) <= 0) {
- ++ppp->estats.rx_length_errors;
- 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));
- } else {
- if (!ppp_receive_frame(ppp, skb)) {
- KFREE_SKB(skb);
- ppp_receive_error(ppp);
- }
- }
-
- /* Reset for the next frame */
- skb = NULL;
- }
- ppp->rpkt = skb;
- return;
- }
-
- 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;
- }
- }
-
- /*
- * 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.
- */
-
-#ifdef CHECK_CHARACTERS
- if (chr & 0x80)
- ppp->flags |= SC_RCV_B7_1;
- else
- ppp->flags |= SC_RCV_B7_0;
-
- if (paritytab[chr >> 5] & (1 << (chr & 0x1F)))
- ppp->flags |= SC_RCV_ODDP;
- else
- ppp->flags |= SC_RCV_EVNP;
-#endif
-
- 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 we're tossing, look no further. */
- if (ppp->toss != 0)
- continue;
-
- /* If this is a control char to be ignored, do so */
- if (in_rmap(ppp, chr))
- continue;
-
- /*
- * 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;
- }
-
- /*
- * 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 "couldn't "
- "alloc skb for recv\n");
- ppp->toss = 1;
- continue;
- }
- LIBERATE_SKB(skb);
- }
-
- /*
- * 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;
- }
-
- /*
- * 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;
- }
-
- /*
- * Store the character and update the FCS.
- */
- p = skb_put(skb, 1);
- *p = chr;
- ppp->rfcs = PPP_FCS(ppp->rfcs, chr);
- }
- ppp->rpkt = skb;
-}
-
-/*************************************************************
- * 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.
- *************************************************************/
-
-/*
- * Network device driver callback routines
- */
-
-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 *);
-
-#if LINUX_VERSION_CODE < VERSION(2,1,15)
-static int ppp_dev_header(struct sk_buff *, struct device *, __u16,
- void *, void *, unsigned int);
-static int ppp_dev_rebuild(void *eth, struct device *dev,
- unsigned long raddr, struct sk_buff *skb);
-#endif
-
-/*
- * Information for the protocol decoder
- */
-
-typedef int (*pfn_proto) (struct ppp *, struct sk_buff *);
-
-typedef struct ppp_proto_struct {
- int proto;
- pfn_proto func;
-} ppp_proto_type;
-
-static int rcv_proto_ip (struct ppp *, struct sk_buff *);
-static int rcv_proto_ipv6 (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 *);
-
-static
-ppp_proto_type proto_list[] = {
- { PPP_IP, rcv_proto_ip },
- { PPP_IPV6, rcv_proto_ipv6 },
- { 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 !!! */
-};
-
-/*
- * Called when the PPP network interface device is actually created.
- */
-static int
-ppp_init_dev (struct device *dev)
-{
- dev->hard_header_len = PPP_HDRLEN;
-#if LINUX_VERSION_CODE < VERSION(2,1,15)
- dev->hard_header = ppp_dev_header;
- dev->rebuild_header = ppp_dev_rebuild;
-#endif
-
- /* 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;
-
-#if LINUX_VERSION_CODE < VERSION(2,1,20)
- {
- int indx;
-
- for (indx = 0; indx < DEV_NUMBUFFS; indx++)
- skb_queue_head_init (&dev->buffs[indx]);
- }
-#else
- dev_init_buffers(dev);
-#endif
-
- dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
-
- return 0;
-}
-
-/*
- * Callback from the network layer when the device goes up.
- */
-
-static int
-ppp_dev_open (struct device *dev)
-{
- struct ppp *ppp = dev2ppp(dev);
-
- if (!ppp->inuse || ppp2tty(ppp) == NULL) {
- printk(KERN_ERR "ppp: %s not active\n", dev->name);
- return -ENXIO;
- }
-
- MOD_INC_USE_COUNT;
-
- return 0;
-}
-
-/*
- * Callback from the network layer when the ppp device goes down.
- */
-
-static int
-ppp_dev_close (struct device *dev)
-{
- struct ppp *ppp = dev2ppp (dev);
-
- CHECK_PPP_MAGIC(ppp);
-
- MOD_DEC_USE_COUNT;
-
- return 0;
-}
-
-static inline void
-get_vj_stats(struct vjstat *vj, struct slcompress *slc)
-{
- 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;
-}
-
-/*
- * Callback from the network layer to process the sockioctl functions.
- */
-static int
-ppp_dev_ioctl (struct device *dev, struct ifreq *ifr, int cmd)
-{
- struct ppp *ppp = dev2ppp(dev);
- int nb;
- union {
- struct ppp_stats stats;
- struct ppp_comp_stats cstats;
- char vers[32];
- } u;
-
- CHECK_PPP_MAGIC(ppp);
-
- 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;
-
- 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;
-
- case SIOCGPPPVER:
- strcpy(u.vers, szVersion);
- nb = strlen(u.vers) + 1;
- break;
-
- default:
- return -EINVAL;
- }
-
- if (COPY_TO_USER((void *) ifr->ifr_ifru.ifru_data, &u, nb))
- return -EFAULT;
- return 0;
-}
-
-/*
- * Process the generic PPP ioctls, i.e. those which are not specific
- * to any particular type of hardware link.
- */
-static int
-ppp_ioctl(struct ppp *ppp, unsigned int param2, unsigned long param3)
-{
- register int temp_i = 0, oldflags;
- int error = -EFAULT;
- unsigned long flags;
- struct ppp_idle cur_ddinfo;
- struct npioctl npi;
-
- CHECK_PPP(-ENXIO);
-
- /*
- * The user must have an euid of root to do these requests.
- */
- if (!SUSER())
- return -EPERM;
-
- 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;
- ppp->mru = temp_i;
- if (ppp->flags & SC_DEBUG)
- printk(KERN_INFO
- "ppp_ioctl: set mru to %x\n", temp_i);
- error = 0;
- break;
-
- 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;
-
- case PPPIOCSFLAGS:
- /*
- * Set the flags for the various options
- */
- if (GET_USER(temp_i, (int *) param3))
- break;
-
- if (ppp->flags & ~temp_i & SC_CCP_OPEN)
- ppp_ccp_closed(ppp);
-
- 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;
-
- case PPPIOCSCOMPRESS:
- /*
- * Set the compression mode
- */
- error = ppp_set_compression
- (ppp, (struct ppp_option_data *) param3);
- break;
-
- 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;
-
- case PPPIOCSDEBUG:
- /*
- * Set the debug level
- */
- if (GET_USER(temp_i, (int *) param3))
- break;
- temp_i = (temp_i & 0x1F) << 16;
-
- if ((ppp->flags | temp_i) & SC_DEBUG)
- printk(KERN_INFO
- "ppp_ioctl: set dbg flags to %x\n", temp_i);
-
- save_flags(flags);
- cli();
- ppp->flags = (ppp->flags & ~0x1F0000) | temp_i;
- restore_flags(flags);
- error = 0;
- break;
-
- case PPPIOCGDEBUG:
- /*
- * Get the debug level
- */
- temp_i = (ppp->flags >> 16) & 0x1F;
- if (PUT_USER(temp_i, (int *) param3))
- break;
- error = 0;
- break;
-
- 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;
-
- 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);
-
- error = -ENOMEM;
- if (ppp->slcomp == NULL) {
- printk(KERN_ERR "ppp: no memory for VJ compression\n");
- break;
- }
- error = 0;
- break;
-
- case PPPIOCGNPMODE:
- case PPPIOCSNPMODE:
- if (COPY_FROM_USER(&npi, (void *) param3, sizeof(npi)))
- break;
-
- switch (npi.protocol) {
- case PPP_IPV6:
- npi.protocol = NP_IPV6;
- break;
- 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 = 0;
- break;
-
- default:
- /*
- * All other ioctl() events will come here.
- */
- if (ppp->flags & SC_DEBUG)
- printk(KERN_ERR
- "ppp_ioctl: invalid ioctl: %x, addr %lx\n",
- param2, param3);
-
- error = -ENOIOCTLCMD;
- break;
- }
-out:
- return error;
-}
-
-/*
- * Process the set-compression ioctl.
- */
-static int
-ppp_set_compression (struct ppp *ppp, struct ppp_option_data *odp)
-{
- struct compressor *cp;
- int error, nb;
- unsigned long flags;
- __u8 *ptr;
- __u8 ccp_option[CCP_MAX_OPTION_LENGTH];
- struct ppp_option_data data;
-
- /*
- * Fetch the compression parameters
- */
- error = -EFAULT;
- if (COPY_FROM_USER(&data, odp, sizeof (data)))
- goto out;
-
- nb = data.length;
- ptr = data.ptr;
- if ((unsigned) nb >= CCP_MAX_OPTION_LENGTH)
- nb = CCP_MAX_OPTION_LENGTH;
-
- if (COPY_FROM_USER(ccp_option, ptr, nb))
- goto out;
-
- error = -EINVAL;
- if (ccp_option[1] < 2) /* preliminary check on the length byte */
- goto out;
-
- save_flags(flags);
- cli();
- ppp->flags &= ~(data.transmit? SC_COMP_RUN: SC_DECOMP_RUN);
- restore_flags(flags);
-
- cp = find_compressor (ccp_option[0]);
-#if defined(CONFIG_KMOD) || defined(CONFIG_KERNELD)
- if (cp == NULL) {
- char modname[32];
- sprintf(modname, "ppp-compress-%d", ccp_option[0]);
- request_module(modname);
- cp = find_compressor(ccp_option[0]);
- }
-#endif /* CONFIG_KMOD */
-
- 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.
- */
- error = 0;
- if (data.transmit) {
- if (ppp->sc_xc_state != NULL)
- (*ppp->sc_xcomp->comp_free)(ppp->sc_xc_state);
- ppp->sc_xc_state = NULL;
-
- ppp->sc_xcomp = cp;
- ppp->sc_xc_state = cp->comp_alloc(ccp_option, nb);
- if (ppp->sc_xc_state == NULL) {
- if (ppp->flags & SC_DEBUG)
- printk(KERN_DEBUG "%s: comp_alloc failed\n",
- ppp->name);
- error = -ENOBUFS;
- }
- } else {
- if (ppp->sc_rc_state != NULL)
- (*ppp->sc_rcomp->decomp_free)(ppp->sc_rc_state);
- ppp->sc_rc_state = NULL;
-
- ppp->sc_rcomp = cp;
- ppp->sc_rc_state = cp->decomp_alloc(ccp_option, nb);
- if (ppp->sc_rc_state == NULL) {
- if (ppp->flags & SC_DEBUG)
- printk(KERN_DEBUG "%s: decomp_alloc failed\n",
- ppp->name);
- error = -ENOBUFS;
- }
- }
-out:
- return error;
-}
-
-/*
- * 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 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 (slen > len)
- return;
-
- 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;
-
- 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;
- if (!rcvd) {
- /*
- * we're agreeing to send compressed packets.
- */
- if (ppp->sc_xc_state == NULL)
- break;
-
- 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_DEBUG "%s: comp running\n",
- ppp->name);
- cli();
- ppp->flags |= SC_COMP_RUN;
- }
- 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,
- 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 CCP_RESETACK:
- /*
- * CCP Reset-ack resets compressors and decompressors
- * as it passes through.
- */
- 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;
- }
- }
- break;
- }
- restore_flags(flags);
-}
-
-/*
- * CCP is down; free (de)compressor state if necessary.
- */
-
-static void
-ppp_ccp_closed(struct ppp *ppp)
-{
- unsigned long flags;
-
- save_flags(flags);
- cli();
- ppp->flags &= ~(SC_CCP_OPEN | SC_CCP_UP | SC_COMP_RUN | SC_DECOMP_RUN);
- restore_flags(flags);
- if (ppp->flags & SC_DEBUG)
- printk(KERN_DEBUG "%s: ccp closed\n", ppp->name);
- if (ppp->sc_xc_state) {
- (*ppp->sc_xcomp->comp_free) (ppp->sc_xc_state);
- ppp->sc_xc_state = NULL;
- }
-
- if (ppp->sc_rc_state) {
- (*ppp->sc_rcomp->decomp_free) (ppp->sc_rc_state);
- ppp->sc_rc_state = NULL;
- }
-}
-
-/*************************************************************
- * RECEIVE-SIDE ROUTINES
- *************************************************************/
-
-/*
- * On entry, a received frame is in skb.
- * Check it and dispose as appropriate.
- */
-static int
-ppp_receive_frame(struct ppp *ppp, struct sk_buff *skb)
-{
- __u8 *data;
- int count;
- int proto;
- int new_count;
- struct sk_buff *new_skb;
- ppp_proto_type *proto_ptr;
-
- /*
- * 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;
-
- /*
- * 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;
- }
-
- if ( !(ppp->flags & SC_SYNC) ) {
- /*
- * 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 {
- LIBERATE_SKB(new_skb);
- 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;
-}
-
-/*
- * 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_rcv_rx(struct ppp *ppp, __u16 proto, struct sk_buff *skb)
-{
-
- /*
- * 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_pull(skb, PPP_HDRLEN); /* pull off ppp header */
- skb->mac.raw = skb->data;
- ppp->last_recv = jiffies;
- netif_rx (skb);
- return 1;
-}
-
-/*
- * Process the receipt of an IP frame
- */
-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;
-}
-
-/*
- * Process the receipt of an IPv6 frame
- */
-static int
-rcv_proto_ipv6(struct ppp *ppp, struct sk_buff *skb)
-{
- CHECK_PPP(0);
- if ((ppp2dev(ppp)->flags & IFF_UP) && (skb->len > 0)
- && ppp->sc_npmode[NP_IPV6] == NPMODE_PASS)
- return ppp_rcv_rx(ppp, ETH_P_IPV6, skb);
- return 0;
-}
-
-/*
- * Process the receipt of an IPX frame
- */
-static int
-rcv_proto_ipx(struct ppp *ppp, struct sk_buff *skb)
-{
- 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;
-}
-
-/*
- * Process the receipt of an Appletalk frame
- */
-static int
-rcv_proto_at(struct ppp *ppp, struct sk_buff *skb)
-{
- 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;
-}
-
-/*
- * Process the receipt of an VJ Compressed frame
- */
-static int
-rcv_proto_vjc_comp(struct ppp *ppp, struct sk_buff *skb)
-{
- int new_count;
-
- 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;
- }
- new_count += PPP_HDRLEN;
- if (new_count > skb->len)
- skb_put(skb, new_count - skb->len);
- else
- skb_trim(skb, new_count);
- return rcv_proto_ip(ppp, skb);
-}
-
-/*
- * 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
-rcv_proto_ccp(struct ppp *ppp, struct sk_buff *skb)
-{
- CHECK_PPP(0);
- ppp_proto_ccp (ppp, skb->data + PPP_HDRLEN, skb->len - PPP_HDRLEN, 1);
- return rcv_proto_unknown(ppp, skb);
-}
-
-/*
- * Receive all unclassified protocols.
- */
-static int
-rcv_proto_unknown(struct ppp *ppp, struct sk_buff *skb)
-{
- CHECK_PPP(0);
-
- /*
- * 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);
- }
-
- wake_up_interruptible (&ppp->read_wait);
- if (ppp->tty->fasync != NULL)
- kill_fasync (ppp->tty->fasync, SIGIO);
-
- return 1;
-}
-
-/*************************************************************
- * TRANSMIT-SIDE ROUTINES
- *************************************************************/
-
-/* 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;
-}
-
-/*
- * Compress and send an frame to the peer.
- * Should be called with xmit_busy == 1, having been set by the caller.
- * That is, we use xmit_busy as a lock to prevent reentry of this
- * procedure.
- */
-static void
-ppp_send_frame(struct ppp *ppp, struct sk_buff *skb)
-{
- int proto;
- __u8 *data;
- int count;
- __u8 *p;
- int ret;
-
- 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 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;
-
- case PPP_CCP:
- /*
- * Outbound compression control frames
- */
- ppp_proto_ccp(ppp, data + PPP_HDRLEN, count - PPP_HDRLEN, 0);
- break;
- }
- 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->xmit_busy = 0;
- return;
- }
- LIBERATE_SKB(new_skb);
-
- /* 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
- */
- if ( ppp->flags & SC_SYNC )
- ret = ppp_sync_send(ppp, skb);
- else
- ret = ppp_async_send(ppp, skb);
- if (ret > 0) {
- /* we can release the lock */
- ppp->xmit_busy = 0;
- } else if (ret < 0) {
- /* can't happen, since the caller got the xmit_busy lock */
- printk(KERN_ERR "ppp: ppp_async_send didn't accept pkt\n");
- }
-}
-
-/*
- * Apply VJ TCP header compression to a packet.
- */
-static struct sk_buff *
-ppp_vj_compress(struct ppp *ppp, struct sk_buff *skb)
-{
- __u8 *orig_data, *data;
- struct sk_buff *new_skb;
- int len, proto;
-
- new_skb = alloc_skb(skb->len, GFP_ATOMIC);
- if (new_skb == NULL) {
- printk(KERN_ERR "ppp: no memory for vj compression\n");
- return skb;
- }
- LIBERATE_SKB(new_skb);
-
- 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);
-
- if (data == orig_data) {
- /* Couldn't compress the data */
- KFREE_SKB(new_skb);
- return skb;
- }
-
- /* 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];
- }
-
- data = skb_put(new_skb, len + PPP_HDRLEN);
- data[0] = PPP_ALLSTATIONS;
- data[1] = PPP_UI;
- data[2] = 0;
- data[3] = proto;
-
- 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->xmit_busy)) {
- skb = skb_dequeue(&ppp->xmt_q);
- if (skb == NULL) {
- ppp->xmit_busy = 0;
- break;
- }
- ppp_send_frame(ppp, skb);
- }
- if (!ppp->xmit_busy && ppp->dev.tbusy) {
- ppp->dev.tbusy = 0;
- mark_bh(NET_BH);
- }
-}
-
-/*
- * Called from the hardware (tty) layer when it can accept
- * another packet.
- */
-static void
-ppp_output_wakeup(struct ppp *ppp)
-{
- CHECK_PPP_VOID();
-
- if (!ppp->xmit_busy) {
- printk(KERN_ERR "ppp_output_wakeup called but xmit_busy==0\n");
- return;
- }
- ppp->xmit_busy = 0;
- ppp_send_frames(ppp);
-}
-
-/*
- * Send a control frame (from pppd).
- */
-static void
-ppp_send_ctrl(struct ppp *ppp, struct sk_buff *skb)
-{
- CHECK_PPP_VOID();
-
- /*
- * 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 peer.
- * Returns 1 iff the frame was not accepted.
- */
-static int
-ppp_dev_xmit(struct sk_buff *skb, struct device *dev)
-{
- 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.
- */
- if (!ppp->inuse) {
- KFREE_SKB(skb);
- return 0;
- }
-
- /*
- * 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);
- KFREE_SKB(skb);
- return 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_IPV6:
- proto = PPP_IPV6;
- npmode = ppp->sc_npmode[NP_IPV6];
- 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_INFO "%s: packet for unknown proto %x\n",
- ppp->name, ntohs(skb->protocol));
- KFREE_SKB(skb);
- return 0;
- }
-
- /*
- * Drop, accept or reject the packet depending on the mode.
- */
- switch (npmode) {
- case NPMODE_PASS:
- break;
-
- case NPMODE_QUEUE:
- /*
- * We may not send the packet now, so drop it.
- * XXX It would be nice to be able to return it to the
- * network system to be queued and retransmitted later.
- */
- if (ppp->flags & SC_DEBUG)
- printk(KERN_DEBUG "%s: returning frame\n", ppp->name);
- 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);
- KFREE_SKB(skb);
- return 0;
- }
-
- /*
- * 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.
- * We deliberately queue as little as possible inside
- * the ppp driver in order to minimize the latency
- * for high-priority packets.
- */
- if (test_and_set_bit(0, &ppp->xmit_busy)) {
- dev->tbusy = 1; /* can't take it now */
- return 1;
- }
- dev->tbusy = 0;
-
- /*
- * 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);
- KFREE_SKB(skb);
- ppp->xmit_busy = 0;
- ppp_send_frames(ppp);
- return 0;
- }
- LIBERATE_SKB(new_skb);
- skb_reserve(new_skb, PPP_HDRLEN);
- memcpy(skb_put(new_skb, skb->len), skb->data, skb->len);
- KFREE_SKB(skb);
- skb = new_skb;
- }
-
- 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);
- if (!ppp->xmit_busy)
- ppp_send_frames(ppp);
- return 0;
-}
-
-#if LINUX_VERSION_CODE < VERSION(2,1,15)
-/*
- * Null hard_header and header_rebuild routines.
- */
-static int ppp_dev_header(struct sk_buff *skb, struct device *dev,
- unsigned short type, void *daddr,
- void *saddr, unsigned int len)
-{
- return 0;
-}
-
-static int ppp_dev_rebuild(void *eth, struct device *dev,
- unsigned long raddr, struct sk_buff *skb)
-{
- return 0;
-}
-#endif /* < 2.1.15 */
-
-/*
- * Generate the statistic information for the /proc/net/dev listing.
- */
-static struct net_device_stats *
-ppp_dev_stats (struct device *dev)
-{
- struct ppp *ppp = dev2ppp (dev);
-
- ppp->estats.rx_packets = ppp->stats.ppp_ipackets;
- ppp->estats.rx_errors = ppp->stats.ppp_ierrors;
- ppp->estats.tx_packets = ppp->stats.ppp_opackets;
- ppp->estats.tx_errors = ppp->stats.ppp_oerrors;
-#if LINUX_VERSION_CODE >= VERSION(2,1,25)
- ppp->estats.rx_bytes = ppp->stats.ppp_ibytes;
- ppp->estats.tx_bytes = ppp->stats.ppp_obytes;
-#endif
-
- return &ppp->estats;
-}
-
-/*************************************************************
- * UTILITIES
- * Miscellany called by various functions above.
- *************************************************************/
-
-/* Locate the previous instance of the PPP channel */
-static struct ppp *
-ppp_find(int pid_value)
-{
- struct ppp *ppp;
-
- /* try to find the device which this pid is already using */
- for (ppp = ppp_list; ppp != 0; ppp = ppp->next) {
- if (ppp->inuse && ppp->sc_xfer == pid_value) {
- ppp->sc_xfer = 0;
- break;
- }
- }
- return ppp;
-}
-
-/* allocate or create a PPP channel */
-static struct ppp *
-ppp_alloc(void)
-{
- int if_num;
- int status;
- struct device *dev;
- struct ppp *ppp;
-
- /* try to find an free device */
- for (ppp = ppp_list; ppp != 0; ppp = ppp->next) {
- if (!test_and_set_bit(0, &ppp->inuse)) {
- dev = ppp2dev(ppp);
- if (dev->flags & IFF_UP) {
- clear_bit(0, &ppp->inuse);
- continue;
- }
- /* 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 */
- }
- }
-
- /*
- * 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 */
- 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->name = ppp->name;
-#if LINUX_VERSION_CODE < VERSION(2,1,31)
- if_num = (ppp_list == 0)? 0: ppp_last->line + 1;
- sprintf(ppp->name, "ppp%d", if_num);
-#else
- if_num = dev_alloc_name(dev, "ppp%d");
-#endif
- 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);
- } else {
- printk(KERN_ERR
- "ppp_alloc - register_netdev(%s) = %d failure.\n",
- dev->name, status);
- kfree(ppp);
- ppp = NULL;
- }
-
- /* link this unit into our list */
- if (ppp_list == 0)
- ppp_list = ppp;
- else
- ppp_last->next = ppp;
- ppp_last = ppp;
-
- return ppp;
-}
-
-/*
- * 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;
- ppp->xmit_busy = 0;
-
- /* 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);
-
- ppp->inuse = 0;
- if (ppp->dev.tbusy) {
- ppp->dev.tbusy = 0;
- mark_bh(NET_BH);
- }
-}
-
-/*
- * Utility procedures to print a buffer in hex/ascii
- */
-static void
-ppp_print_hex (register __u8 * out, const __u8 * in, int count)
-{
- register __u8 next_ch;
- static char hex[] = "0123456789ABCDEF";
-
- while (count-- > 0) {
- next_ch = *in++;
- *out++ = hex[(next_ch >> 4) & 0x0F];
- *out++ = hex[next_ch & 0x0F];
- ++out;
- }
-}
-
-static void
-ppp_print_char (register __u8 * out, const __u8 * in, int count)
-{
- register __u8 next_ch;
-
- while (count-- > 0) {
- next_ch = *in++;
-
- if (next_ch < 0x20 || next_ch > 0x7e)
- *out++ = '.';
- else {
- *out++ = next_ch;
- if (next_ch == '%') /* printk/syslogd has a bug !! */
- *out++ = '%';
- }
- }
- *out = '\0';
-}
-
-static void
-ppp_print_buffer (const char *name, const __u8 *buf, int count)
-{
- __u8 line[44];
-
- 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);
- count -= 8;
- buf += 8;
- }
-
- if (count > 0) {
- memset (line, 32, 44);
- ppp_print_hex (line, buf, count);
- ppp_print_char (&line[8 * 3], buf, count);
- printk(KERN_DEBUG "%s\n", line);
- }
-}
-
-/*************************************************************
- * Compressor module interface
- *************************************************************/
-
-struct compressor_link {
- struct compressor_link *next;
- struct compressor *comp;
-};
-
-static struct compressor_link *ppp_compressors = (struct compressor_link *) 0;
-
-static struct compressor *find_compressor (int type)
-{
- struct compressor_link *lnk;
- unsigned long flags;
-
- save_flags(flags);
- cli();
-
- lnk = ppp_compressors;
- while (lnk != (struct compressor_link *) 0) {
- if ((int) (__u8) lnk->comp->compress_proto == type) {
- restore_flags(flags);
- return lnk->comp;
- }
- lnk = lnk->next;
- }
-
- restore_flags(flags);
- return (struct compressor *) 0;
-}
-
-static int ppp_register_compressor (struct compressor *cp)
-{
- struct compressor_link *new;
- unsigned long flags;
-
- new = (struct compressor_link *)
- kmalloc (sizeof (struct compressor_link), GFP_KERNEL);
-
- if (new == (struct compressor_link *) 0)
- return 1;
-
- save_flags(flags);
- cli();
-
- if (find_compressor (cp->compress_proto)) {
- restore_flags(flags);
- kfree (new);
- return 0;
- }
-
- new->next = ppp_compressors;
- new->comp = cp;
- ppp_compressors = new;
-
- restore_flags(flags);
- return 0;
-}
-
-static void ppp_unregister_compressor (struct compressor *cp)
-{
- struct compressor_link *prev = (struct compressor_link *) 0;
- struct compressor_link *lnk;
- unsigned long flags;
-
- save_flags(flags);
- cli();
-
- lnk = ppp_compressors;
- while (lnk != (struct compressor_link *) 0) {
- if (lnk->comp == cp) {
- if (prev)
- prev->next = lnk->next;
- else
- ppp_compressors = lnk->next;
- kfree (lnk);
- break;
- }
- prev = lnk;
- lnk = lnk->next;
- }
- restore_flags(flags);
-}
-
-/*************************************************************
- * Module support routines
- *************************************************************/
-
-#ifdef MODULE
-int
-init_module(void)
-{
- int status;
-
- /* register our line disciplines */
- status = ppp_first_time();
- if (status != 0)
- printk(KERN_INFO "PPP: ppp_init() failure %d\n", status);
-#if LINUX_VERSION_CODE < VERSION(2,1,18)
- else
- (void) register_symtab (&ppp_syms);
-#endif
-
- return status;
-}
-
-void
-cleanup_module(void)
-{
- int status;
- struct ppp *ppp, *next_ppp;
- int busy = 0;
-
- /*
- * 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);
-
- /*
- * 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_ERR
- "PPP: Unable to unregister ppp line discipline "
- "(err = %d)\n", status);
- else
- printk(KERN_INFO
- "PPP: ppp line discipline successfully unregistered\n");
-
- /*
- * 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;
- unregister_netdev(&ppp->dev);
- kfree (ppp);
- }
-}
-#endif
projects / ppp.git / commitdiff