-/*
- PPP for Linux
-
- $Id: ppp.c,v 1.3 1994/12/08 02:03:55 paulus Exp $
-*/
+/* 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:
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 not defined then the leading
+ 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.
-
- NEW_SKBUFF - Use NET3.020 sk_buff's
*/
-/* #define NEW_SKBUFF */
-#define OPTIMIZE_FLAG_TIME ((HZ * 3)/2) /* */
+#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/signal.h> /* used in new tty drivers */
#include <asm/system.h>
#include <asm/bitops.h>
-#include <asm/segment.h>
-#include <net/if.h>
-#include <net/if_arp.h>
-#include <net/if_route.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
-#ifdef NEW_SKBUFF
-#include <linux/netprotocol.h>
+#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
-#define skb_data(skb) ((skb)->data)
-typedef struct sk_buff sk_buff;
+#include <asm/segment.h>
#endif
-#include <ip.h>
-#include <tcp.h>
-#include <linux/if_arp.h>
-#include "slhc.h"
-#include <net/ppp_defs.h>
-#include <linux/socket.h>
-#include <net/if_ppp.h>
-#include <net/if_pppvar.h>
+#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
-#ifndef PPP_IPX
-#define PPP_IPX 0x2b /* IPX protocol over PPP */
+#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 void ppp_init_ctrl_blk (register struct ppp *);
-static void ppp_kick_tty (struct ppp *, struct ppp_buffer *bfr);
-static int ppp_doframe (struct ppp *);
-static int ppp_do_ip (struct ppp *, unsigned short, u_char *, int);
-static int ppp_us_queue (struct ppp *, unsigned short, u_char *, int);
+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_print_buffer (const u_char *, u_char *, int, int);
-extern inline void ppp_stuff_char (struct ppp *ppp,
- register struct ppp_buffer *buf,
- register u_char chr);
-extern inline int lock_buffer (register struct ppp_buffer *buf);
+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);
-#define ins_char(pbuf,c) (buf_base(pbuf) [(pbuf)->count++] = (u_char)(c))
+#ifndef OPTIMIZE_FLAG_TIME
+#define OPTIMIZE_FLAG_TIME 0
+#endif
/*
- * The "main" procedure to the ppp device
+ * Parameters which may be changed via insmod.
*/
-int ppp_init (struct device *);
+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";
-/*
- * Network device driver callback routines
- */
+static char szVersion[] = PPP_VERSION;
-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 enet_statistics *ppp_dev_stats (struct device *);
-
-#ifdef NEW_SKBUFF
-static int ppp_dev_input (struct protocol *self, struct protocol *lower,
- sk_buff *skb, void *saddr, void *daddr);
-static int ppp_dev_output (struct protocol *self, sk_buff *skb, int type,
- int subid, void *saddr, void *daddr, void *opt);
-static int ppp_dev_getkey(int protocol, int subid, unsigned char *key);
+#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
-static int ppp_dev_header (u_char *, struct device *, unsigned short,
- void *, void *, unsigned, sk_buff *);
-static int ppp_dev_rebuild (void *, struct device *, unsigned long,
- sk_buff *);
-static unsigned short ppp_dev_type (sk_buff *, struct device *);
+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 int ppp_tty_read (struct tty_struct *, struct file *, u_char *,
- unsigned int);
-static int ppp_tty_write (struct tty_struct *, struct file *, u_char *,
- unsigned int);
-static int ppp_tty_ioctl (struct tty_struct *, struct file *, unsigned int,
- unsigned long);
-static int ppp_tty_select (struct tty_struct *tty, struct inode *inode,
- struct file *filp, int sel_type, select_table * wait);
+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, u_char * cp,
+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 PRINTK(p) printk p ;
-#define ASSERT(p) if (!p) PRINTK ((KERN_CRIT "assertion failed: " # p))
-#define PRINTKN(n,p) {if (ppp_debug >= n) PRINTK (p)}
-#define CHECK_PPP(a) if (!ppp->inuse) { PRINTK ((ppp_warning, __LINE__)) return a;}
-#define CHECK_PPP_VOID() if (!ppp->inuse) { PRINTK ((ppp_warning, __LINE__)) return;}
-
-#define in_xmap(ppp,c) (ppp->xmit_async_map[(c) >> 5] & (1 << ((c) & 0x1f)))
-#define in_rmap(ppp,c) ((((unsigned int) (u_char) (c)) < 0x20) && \
- ppp->recv_async_map & (1 << (c)))
-
-#define bset(p,b) ((p)[(b) >> 5] |= (1 << ((b) & 0x1f)))
-
-/* 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 envocations */
-static char ppp_warning[] = KERN_WARNING "PPP: ALERT! not INUSE! %d\n";
-
-static int first_time = 1;
-static char szVersion[] = PPP_VERSION;
-static int ppp_debug = 5;
-static int ppp_debug_netpackets = 0;
-static struct tty_ldisc ppp_ldisc;
-static struct ppp ppp_ctrl [PPP_NRUNIT];
-
-#ifdef NEW_SKBUFF
-struct protocol proto_ppp;
-#endif
-
-/* FCS table from RFC1331 */
-
-static unsigned short fcstab[256] =
+__u16 ppp_crc16_table[256] =
{
0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf,
0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7,
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
-/*************************************************************
- * INITIALIZATION
- *************************************************************/
-
-/* called at boot time for each ppp device */
-
-int
-ppp_init (struct device *dev)
+#ifdef CHECK_CHARACTERS
+static __u32 paritytab[8] =
{
- struct ppp *ppp;
- int i;
-
- ppp = &ppp_ctrl[dev->base_addr];
-
- if (first_time) {
- first_time = 0;
-
- printk (KERN_INFO "PPP: version %s (%d channels)"
-#ifdef NEW_SKBUFF
- " NEW_SKBUFF"
+ 0x96696996, 0x69969669, 0x69969669, 0x96696996,
+ 0x69969669, 0x96696996, 0x96696996, 0x69969669
+};
#endif
- "\n", szVersion, PPP_NRUNIT);
-
- printk (KERN_INFO
- "TCP compression code copyright 1989 Regents of the "
- "University of California\n");
-
- (void) memset (&ppp_ldisc, 0, sizeof (ppp_ldisc));
- ppp_ldisc.magic = TTY_LDISC_MAGIC;
- 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;
- ppp_ldisc.select = ppp_tty_select;
- ppp_ldisc.receive_room = ppp_tty_room;
- ppp_ldisc.receive_buf = ppp_tty_receive;
- ppp_ldisc.write_wakeup = ppp_tty_wakeup;
-
- i = tty_register_ldisc (N_PPP, &ppp_ldisc);
- if (i == 0) {
- printk (KERN_INFO "PPP line discipline registered.\n");
- } else {
- printk (KERN_ERR "error registering line discipline: %d\n", i);
- }
-#ifdef NEW_SKBUFF
- memset (&proto_ppp, 0, sizeof (proto_ppp));
+/*
+ * 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;
- proto_ppp.name = "PPP";
- proto_ppp.output = ppp_dev_output;
- proto_ppp.input = ppp_dev_input;
- proto_ppp.bh_input = ppp_dev_input;
- proto_ppp.control_event = default_protocol_control;
- proto_ppp.get_binding = ppp_dev_getkey;
+ printk(KERN_INFO
+ "PPP: version %s (demand dialling)"
+ "\n", szVersion);
- protocol_register(&proto_ppp);
+#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
- }
- /* initialize PPP control block */
- ppp_init_ctrl_blk (ppp);
- ppp->inuse = 0;
- ppp->line = dev->base_addr;
- ppp->tty = NULL;
- ppp->dev = dev;
-
- /* clear statistics */
- memset (&ppp->p, '\0', sizeof (struct ppp_stats));
-
-#ifdef NEW_SKBUFF
- dev->default_protocol = &proto_ppp; /* Our protocol layer is PPP */
+ /*
+ * 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
- dev->hard_header = ppp_dev_header;
- dev->type_trans = ppp_dev_type;
- dev->rebuild_header = ppp_dev_rebuild;
- dev->hard_header_len = 0;
+ 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;
+}
- /* 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->type = ARPHRD_PPP;
-
- for (i = 0; i < DEV_NUMBUFFS; i++) {
- skb_queue_head_init (&dev->buffs[i]);
- }
- /* New-style flags */
- dev->flags = IFF_POINTOPOINT;
- dev->family = AF_INET;
- dev->pa_addr = 0;
- dev->pa_brdaddr = 0;
- dev->pa_mask = 0;
- dev->pa_alen = sizeof (unsigned long);
+#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;
- return 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
/*
- * Local procedure to initialize the ppp structure
+ * Initialize the async-specific parts of the ppp structure.
*/
-
static void
-ppp_init_ctrl_blk (register struct ppp *ppp)
+ppp_async_init(struct ppp *ppp)
{
- ppp->magic = PPP_MAGIC;
- ppp->toss = 0xE0;
ppp->escape = 0;
-
- ppp->flags = 0;
- ppp->mtu = PPP_MTU;
- ppp->mru = PPP_MRU;
+ 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 = 0x00000000;
-
- ppp->rbuf = NULL;
- ppp->wbuf = NULL;
- ppp->ubuf = NULL;
- ppp->cbuf = NULL;
- ppp->slcomp = NULL;
- ppp->read_wait = NULL;
- ppp->write_wait = NULL;
-
-#ifdef OPTIMIZE_FLAG_TIME /* ensure flag will always be sent first time */
- ppp->last_xmit = jiffies - OPTIMIZE_FLAG_TIME;
-#else
- ppp->last_xmit = 0;
-#endif
-
- /* clear statistics */
- memset (&ppp->p, '\0', sizeof (struct ppp_stats));
-
- /* Reset the demand dial information */
- ppp->ddinfo.ip_sjiffies =
- ppp->ddinfo.ip_rjiffies =
- ppp->ddinfo.nip_sjiffies =
- ppp->ddinfo.nip_rjiffies = jiffies;
-}
+ ppp->recv_async_map = 0xffffffff;
-/*
- * Routine to allocate a buffer for later use by the driver.
- */
+ ppp->tpkt = NULL;
+ ppp->tfcs = PPP_INITFCS;
+ ppp->optr = ppp->obuf;
+ ppp->olim = ppp->obuf;
-static struct ppp_buffer *
-ppp_alloc_buf (int size, int type)
-{
- struct ppp_buffer *buf;
+ ppp->rpkt = NULL;
+ ppp->rfcs = PPP_INITFCS;
- buf = (struct ppp_buffer *) kmalloc (size + sizeof (struct ppp_buffer),
- GFP_ATOMIC);
+ ppp->tty = NULL;
+ ppp->backup_tty = NULL;
- 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;
- }
- return (buf);
+ ppp->bytes_sent = 0;
+ ppp->bytes_rcvd = 0;
}
/*
- * Routine to release the allocated buffer.
+ * Clean up the async-specific parts of the ppp structure.
*/
-
static void
-ppp_free_buf (struct ppp_buffer *ptr)
-{
- if (ptr != NULL) {
- kfree (ptr);
- }
-}
-
-/*
- * Lock the indicated transmit buffer
- */
-
-extern inline int
-lock_buffer (register struct ppp_buffer *buf)
+ppp_async_release(struct ppp *ppp)
{
- register int state;
- int flags;
-/*
- * Save the current state and if free then set it to the "busy" state
- */
- save_flags (flags);
- cli ();
- state = buf->locked;
- if (state == 0) {
- buf->locked = 2;
- }
-/*
- * Restore the flags and return the previous state. 0 implies success.
- */
- restore_flags (flags);
- return (state);
+ 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;
}
/*
- * 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;
-
- 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;
+ struct ppp *ppp;
- int mtu, mru;
-/*
- * Allocate the buffer from the kernel for the data
- */
- dev = ppp->dev;
- mru = new_mru;
- mtu = (new_mtu * 2) + 20;
+ /*
+ * 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);
- /* RFC 1331, section 7.2 says the minimum value is 1500 bytes */
- if (mru < PPP_MRU) {
- mru = PPP_MRU;
- }
- mru += 10;
+ } else {
+ ppp = ppp_alloc();
+ if (ppp == NULL) {
+ printk(KERN_ERR "ppp_alloc failed\n");
+ return -ENFILE;
+ }
- PRINTKN (2, (KERN_INFO "ppp: channel %s mtu = %d, mru = %d\n",
- dev->name, new_mtu, new_mru));
+ /*
+ * Initialize the control block
+ */
+ ppp_generic_init(ppp);
+ ppp_async_init(ppp);
- new_wbuf = ppp_alloc_buf (mtu + 4, 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 + 4, 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) {
- PRINTKN (2,(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;
+ MOD_INC_USE_COUNT;
}
-/*
- * Update the pointers to the new buffer structures.
- */
- 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;
-
- 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;
+ tty->disc_data = ppp;
+ ppp->tty = tty;
- ppp->tty->flags &= ~TTY_DO_WRITE_WAKEUP;
- ppp->flags &= ~SC_XMIT_BUSY;
+ /*
+ * Flush any pending characters in the driver
+ */
+ if (tty->driver.flush_buffer)
+ tty->driver.flush_buffer (tty);
- sti ();
-/*
- * 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;
+ return ppp->line;
}
/*
- * Called to release all of the information in the current PPP structure.
+ * TTY callback.
*
- * It is called when the ppp device goes down or if it is unable to go
- * up.
+ * Called when the line discipline is changed to something
+ * else, the tty is closed, or the tty detects a hangup.
*/
static void
-ppp_release (struct ppp *ppp)
+ppp_tty_close (struct tty_struct *tty)
{
- if (ppp->tty != NULL && ppp->tty->disc_data == ppp) {
- ppp->tty->disc_data = NULL; /* Break the tty->ppp link */
- }
- if (ppp->dev) {
- ppp->dev->flags &= ~IFF_UP; /* down the device */
- ppp->dev->flags |= IFF_POINTOPOINT;
- }
- 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;
+ struct ppp *ppp = tty2ppp(tty);
- if (ppp->slcomp) {
- slhc_free (ppp->slcomp);
- ppp->slcomp = 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;
+ 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;
}
- ppp->inuse = 0;
- ppp->tty = NULL;
}
/*
- * Device callback.
- *
- * Called when the PPP device goes down in response to an ifconfig request.
+ * Read a PPP frame from the rcv_q list,
+ * waiting if necessary
*/
-
-static void
-ppp_tty_close (struct tty_struct *tty)
+static rw_ret_t
+ppp_tty_read(struct tty_struct *tty, struct file *file, __u8 * buf,
+ rw_count_t nr)
{
- struct ppp *ppp = (struct ppp *) tty->disc_data;
+ 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;
- if (ppp == NULL || ppp->magic != PPP_MAGIC) {
- PRINTKN (1,
- (KERN_WARNING "ppp: trying to close unopened tty!\n"));
- } else {
- CHECK_PPP_VOID ();
- PRINTKN (2,
- (KERN_INFO "ppp: channel %s closing.\n", ppp->dev->name));
- ppp_release (ppp);
+ 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;
}
/*
- * TTY callback.
- *
- * Called when the tty dicipline is switched to PPP.
+ * Writing to a tty in ppp line discipline sends a PPP frame.
+ * Used by pppd to send control packets (LCP, etc.).
*/
-
-static int
-ppp_tty_open (struct tty_struct *tty)
+static rw_ret_t
+ppp_tty_write(struct tty_struct *tty, struct file *file, const __u8 * data,
+ rw_count_t count)
{
- struct ppp *ppp = (struct ppp *) tty->disc_data;
-/*
- * There should not be an existing table for this slot.
- */
- if (ppp) {
- PRINTKN (1, (KERN_ERR
- "ppp_tty_open: gack! tty already associated to %s!\n",
- ppp->magic == PPP_MAGIC ? ppp->dev->name
- : "unknown"));
- return -EEXIST;
- }
-/*
- * Allocate the structure from the system
- */
- ppp = ppp_alloc ();
- if (ppp == NULL) {
- PRINTKN (1, (KERN_ERR
- "ppp_tty_open: couldn't allocate ppp channel\n"));
- return -ENFILE;
- }
-/*
- * Initialize the control block
- */
- ppp_init_ctrl_blk (ppp);
- ppp->tty = tty;
- tty->disc_data = ppp;
-/*
- * Flush any pending characters in the driver and dicipline.
- */
- if (tty->ldisc.flush_buffer) {
- tty->ldisc.flush_buffer (tty);
- }
+ struct ppp *ppp = tty2ppp (tty);
+ __u8 *new_data;
+ struct sk_buff *skb;
+
+ /*
+ * Verify the pointers.
+ */
+ if (!ppp)
+ return -EIO;
- if (tty->driver.flush_buffer) {
- tty->driver.flush_buffer (tty);
- }
-/*
- * Allocate space for the default VJ header compression slots (16)
- */
- ppp->slcomp = slhc_init (16, 16);
- if (ppp->slcomp == NULL) {
- PRINTKN (1, (KERN_ERR
- "ppp_tty_open: no space for compression buffers!\n"));
- ppp_release (ppp);
- return -ENOMEM;
+ 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 space for the MTU and MRU buffers
- */
- if (ppp_changedmtu (ppp, ppp->dev->mtu, ppp->mru) == 0) {
- ppp_release (ppp);
- return -ENOMEM;
+
+ /*
+ * 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;
}
-/*
- * Allocate space for a user level buffer
- */
- ppp->ubuf = ppp_alloc_buf (RBUFSIZE, BUFFER_TYPE_TTY_RD);
- if (ppp->ubuf == NULL) {
- PRINTKN (1, (KERN_ERR
- "ppp_tty_open: no space for user receive buffer\n"));
- ppp_release (ppp);
- return -ENOMEM;
+ 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;
}
- PRINTKN (2, (KERN_INFO "ppp: channel %s open\n", ppp->dev->name));
- return (ppp->line);
+ /*
+ * Send the frame
+ */
+ ppp_send_ctrl(ppp, skb);
+
+ return (rw_ret_t) count;
}
/*
- * 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.
+ * 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_wakeup_code (struct ppp *ppp, struct tty_struct *tty,
- struct ppp_buffer *xbuf)
+static int
+ppp_tty_ioctl (struct tty_struct *tty, struct file * file,
+ unsigned int param2, unsigned long param3)
{
- register int count, actual;
-/*
- * Prevent re-entrancy by ensuring that this routine is called only once.
- */
- cli ();
- if (ppp->flags & SC_XMIT_BUSY) {
- sti ();
- return;
- }
- ppp->flags |= SC_XMIT_BUSY;
- sti ();
-/*
- * 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->p.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 transmisson on the current buffer.
- */
- xbuf = ppp->xbuf;
- if (xbuf != NULL) {
- tty->flags &= ~TTY_DO_WRITE_WAKEUP;
- xbuf->locked = 0;
- ppp->xbuf = NULL;
-/*
- * If the completed buffer came from the device write, then complete the
- * transmission block.
- */
- if (ppp->dev->flags & IFF_UP) {
- ppp->dev->tbusy = 0;
- mark_bh (NET_BH);
- dev_tint (ppp->dev);
- }
-/*
- * 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.
- */
- 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);
- }
+ 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;
+}
+
/*
- * Clear the re-entry flag
+ * TTY callback.
+ *
+ * Process the select() or poll() statement for the PPP device.
*/
- ppp->flags &= ~SC_XMIT_BUSY;
+
+#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.
- *
- * In addition, it is used to send the first part of the buffer since the
- * logic and the inter-locking would be identical.
*/
-
static void
ppp_tty_wakeup (struct tty_struct *tty)
{
- struct ppp_buffer *xbuf;
- struct ppp *ppp = (struct ppp *) tty->disc_data;
+ struct ppp *ppp = tty2ppp (tty);
- if (!ppp || ppp->magic != PPP_MAGIC) {
- PRINTKN (1, (KERN_ERR "PPP: write_wakeup called but couldn't "
- "find PPP struct.\n"));
+ 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);
+}
+
/*
- * Ensure that there is a transmission pending. Clear the re-entry flag if
- * there is no pending buffer. Otherwise, send the buffer.
+ * 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.
*/
- xbuf = ppp->xbuf;
- if (xbuf == NULL) {
- tty->flags &= ~(1 << TTY_DO_WRITE_WAKEUP);
- } else {
- ppp_tty_wakeup_code (ppp, tty, xbuf);
- }
+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);
}
/*
- * This function is called to transmit a buffer to the rmeote. 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.
+ * Push a synchronous frame out to the tty.
+ * Returns 1 if frame accepted (or discarded), 0 otherwise.
*/
-
-static void
-ppp_kick_tty (struct ppp *ppp, struct ppp_buffer *xbuf)
+static int
+ppp_tty_sync_push(struct ppp *ppp)
{
- register int flags;
+ 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;
+}
+
/*
- * Hold interrupts.
+ * 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.
*/
- save_flags (flags);
- cli ();
+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);
+}
+
/*
- * Control the flags which are best performed with the interrupts masked.
+ * Push as much data as possible out to the tty.
+ * Returns 1 if we finished encoding the current frame, 0 otherwise.
*/
- xbuf->locked = 1;
- xbuf->tail = 0;
+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;
+}
+
/*
- * If the transmitter is busy then place the buffer on the appropriate
- * priority queue.
+ * 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.
*/
- if (ppp->xbuf != NULL) {
- if (xbuf->type == BUFFER_TYPE_TTY_WR) {
- ppp->s1buf = xbuf;
- } else {
- ppp->s2buf = xbuf;
+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;
}
- restore_flags (flags);
- return;
+ *buf++ = c;
}
-/*
- * 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, ppp->tty, xbuf);
-}
-/*************************************************************
- * 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.
- *************************************************************/
+ 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;
-#ifdef CHECK_CHARACTERS
-static unsigned paritytab[8] =
+ 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)
{
- 0x96696996, 0x69969669, 0x69969669, 0x96696996,
- 0x69969669, 0x96696996, 0x96696996, 0x69969669
-};
-#endif
+ 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)
{
/*
* Callback function when data is available at the tty driver.
*/
-
static void
-ppp_tty_receive (struct tty_struct *tty, u_char * data, char *flags, int count)
+ppp_tty_receive (struct tty_struct *tty, const __u8 * data,
+ char *flags, int count)
{
- register struct ppp *ppp = (struct ppp *) tty->disc_data;
- register struct ppp_buffer *buf = ppp->rbuf;
- u_char chr;
-/*
- * Verify the table pointer and ensure that the line is still in PPP dicipline.
- */
- if (!ppp || ppp->magic != PPP_MAGIC) {
- PRINTKN (1, ("PPP: handler called but couldn't find "
- "PPP struct.\n"));
+ 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;
}
- CHECK_PPP_VOID ();
-/*
- * Print the buffer if desired
- */
- if (ppp_debug >= 5) {
- ppp_print_buffer ("receive buffer", data, count, KERNEL_DS);
+ /*
+ * 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;
}
-/*
- * Collect the character and error condition for the character. Set the toss
- * flag for the first character error.
- */
+
while (count-- > 0) {
- ppp->bytes_rcvd++;
+ /*
+ * Collect the character and error condition for the character.
+ * Set the toss flag for the first character error.
+ */
chr = *data++;
if (flags) {
- if (*flags && ppp->toss == 0) {
- ppp->toss = *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;
}
- ++flags;
}
-/*
- * Set the flags for 8 data bits and no parity.
- *
- * Actually, it sets 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 would denote an error condition.
- */
+
+ /*
+ * 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) {
+ if (chr & 0x80)
ppp->flags |= SC_RCV_B7_1;
- } else {
+ else
ppp->flags |= SC_RCV_B7_0;
- }
- if (paritytab[chr >> 5] & (1 << (chr & 0x1F))) {
+ if (paritytab[chr >> 5] & (1 << (chr & 0x1F)))
ppp->flags |= SC_RCV_ODDP;
- } else {
+ else
ppp->flags |= SC_RCV_EVNP;
- }
#endif
-/*
- * Branch on the character. Process the escape character. The sequence ESC ESC
- * is defined to be ESC.
- */
- switch (chr) {
- case PPP_ESCAPE: /* PPP_ESCAPE: invert bit in next character */
- ppp->escape = PPP_TRANS;
- break;
-/*
- * 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->p.ppp_ibytes = ppp->bytes_rcvd;
- if (ppp->escape) {
+
+ 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);
}
-/*
- * Process frames which are not to be ignored. If the processing failed,
- * then clean up the VJ tables.
- */
- if ((ppp->toss & 0x80) != 0 ||
- ppp_doframe (ppp) == 0) {
- slhc_toss (ppp->slcomp);
- }
-/*
- * Reset all indicators for the new frame to follow.
- */
- buf->count = 0;
- buf->fcs = PPP_INITFCS;
+ /*
+ * Reset for the next frame.
+ */
+ skb = NULL;
+ ppp->rfcs = PPP_INITFCS;
ppp->escape = 0;
- ppp->toss = 0;
- break;
-/*
- * All other characters in the data come here. If the character is in the
- * recieve mask then ignore the character.
- */
- default:
- if (in_rmap (ppp, chr)) {
- break;
- }
-/*
- * Adjust the character and if the frame is to be discarded then simply
- * ignore the character until the ending FLAG is received.
- */
- chr ^= ppp->escape;
+ 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;
+ }
- if (ppp->toss != 0) {
- break;
+ /*
+ * 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;
}
-/*
- * 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->p.ppp_ierrors++;
- ppp->toss |= 0xC0;
- break;
+ LIBERATE_SKB(skb);
}
- }
-}
-/* on entry, a received frame is in ppp->rbuf.bufr
- check it and dispose as appropriate */
-
-static int
-ppp_doframe (struct ppp *ppp)
-{
- u_short proto;
- u_char *data = buf_base (ppp->rbuf);
- int count = ppp->rbuf->count;
-/*
- * If there is a pending error from the receiver then log it and discard
- * the damaged frame.
- */
- if (ppp->toss) {
- PRINTKN (1, (KERN_WARNING
- "ppp_toss: tossing frame, reason = %d\n",
- ppp->toss));
- ppp->p.ppp_ierrors++;
- return 0;
- }
-/*
- * An empty frame is ignored. This occurs if the FLAG sequence precedes and
- * follows each frame.
- */
- if (count == 0) {
- return 1;
- }
-/*
- * Print the received data.
- */
- if (ppp_debug >= 3) {
- ppp_print_buffer ("receive frame", data, count, KERNEL_DS);
- }
-/*
- * Generate an error if the frame is too small.
- */
- if (count < 4) {
- PRINTKN (1, (KERN_WARNING
- "ppp: got runt ppp frame, %d chars\n", count));
- ppp->p.ppp_ierrors++;
- return 1;
- }
-/*
- * Verify the CRC of the frame and discard the CRC characters from the
- * end of the buffer.
- */
- if (ppp->rbuf->fcs != PPP_GOODFCS) {
- PRINTKN (1, (KERN_WARNING
- "ppp: frame with bad fcs, excess = %x\n",
- ppp->rbuf->fcs ^ PPP_GOODFCS));
- ppp->p.ppp_ierrors++;
- return 0;
- }
- count -= 2; /* ignore the fcs characters */
-/*
- * Ignore the leading ADDRESS and CONTROL fields in the frame.
- */
- if ((data[0] == PPP_ALLSTATIONS) && (data[1] == PPP_UI)) {
- data += 2;
- count -= 2;
- }
-
- proto = (u_short) * data++; /* PROTO compressed */
- if (proto & 1) {
- count--;
- } else {
- proto = (proto << 8) | (u_short) * data++;
- count -= 2;
- }
-
- /* Send the frame to the network if the ppp device is up */
- if (ppp->dev->flags & IFF_UP) {
- if (ppp_do_ip (ppp, proto, data, count)) {
- ppp->ddinfo.ip_rjiffies = jiffies;
- return 1;
- }
- }
-
- /* If we got here, it has to go to a user process doing a read,
- so queue it. */
- if (ppp_us_queue (ppp, proto, data, count)) {
- ppp->ddinfo.nip_rjiffies = jiffies;
- return 1;
- }
-
- /* couldn't cope. */
- PRINTKN (1, (KERN_WARNING
- "ppp: dropping packet on the floor: nobody could take it.\n"));
- ppp->p.ppp_ierrors++;
- return 1;
-}
-
-/* Examine packet at C, attempt to pass up to net layer.
- PROTO is the protocol field from the PPP frame.
- Return 1 if could handle it, 0 otherwise. */
-
-static int
-ppp_do_ip (struct ppp *ppp, unsigned short proto, u_char * data, int count)
-{
- sk_buff *skb;
-/*
- * Log the IP information
- */
- PRINTKN (4, (KERN_DEBUG "ppp_do_ip: proto %x len %d first byte %x\n",
- (int) proto, count, data[0]));
-
- if (ppp_debug_netpackets) {
- PRINTK ((KERN_DEBUG "%s <-- proto %x len %d\n", ppp->dev->name,
- (int) proto, count));
- }
-/*
- * If this is uncompressed IP data then receive the data
- */
- switch (proto) {
- case PPP_IP:
- break;
-/*
- * For now, reject the IPX frames. Return 1 to indicate that it has been
- * processed so that it is simply discarded.
- */
- case PPP_IPX:
- return 1;
-/*
- * Process compressed IP frame. If the remote told us to reject frames then
- * do so now. Otherwise ensure that there is space in the buffer.
- */
- case PPP_VJC_COMP:
- if (ppp->flags & SC_REJ_COMP_TCP) {
- return 1;
- }
-/*
- * Uncompress the header. We now can _guarantee_ that there is room.
- */
- count = slhc_uncompress (ppp->slcomp, data, count);
- if (count <= 0) {
- ppp->p.ppp_ierrors++;
- PRINTKN (1, (KERN_NOTICE
- "ppp: error in VJ decompression\n"));
- return 1;
+ /*
+ * 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;
}
- proto = PPP_IP;
- break;
-/*
- * Process uncompressed IP frame
- */
- case PPP_VJC_UNCOMP:
- if ((ppp->flags & SC_REJ_COMP_TCP) == 0) {
- if (slhc_remember (ppp->slcomp,
- data, count) <= 0) {
- ppp->p.ppp_ierrors++;
- PRINTKN (1, (KERN_NOTICE
- "ppp: error in VJ memorizing\n"));
- return 1;
- }
+ if (skb->len == 2 && (chr & 1) != 0) {
+ p = skb_put(skb, 1);
+ p[0] = 0;
}
- proto = PPP_IP;
- break;
-/*
- * The frame is not a valid IP frame. Ignore it.
- */
- default:
- return 0;
- }
-/*
- * If debugging net packets then print the information. Process the IP
- * frames first.
- */
- if (ppp_debug_netpackets && proto == PPP_IP) {
- struct iphdr *iph = (struct iphdr *) data;
- PRINTK ((KERN_INFO
- "%s <-- src %lx dst %lx len %d\n",
- ppp->dev->name,
- iph->saddr,
- iph->daddr,
- count));
- }
-/*
- * Generate a skb buffer for the new frame.
- */
- skb = alloc_skb (count, GFP_ATOMIC);
- if (skb == NULL) {
- PRINTK ((KERN_ERR
- "ppp_do_ip: packet dropped on %s (no memory)!\n",
- ppp->dev->name));
- }
-/*
- * Move the received data from the input buffer to the skb buffer.
- */
- else {
- skb->len = count; /* Store the length */
- skb->dev = ppp->dev; /* We are the device */
- memcpy ((u_char *) skb_data(skb), data, count); /* move data */
-/*
- * Tag the frame and kick it to the proper receive routine
- */
- skb->free = 1;
- netif_rx (skb); /* Receive the buffer */
- }
- return 1;
-}
-
-/* stuff packet at BUF, length LEN, into the us_rbuff buffer
- prepend PROTO information */
-
-static int
-ppp_us_queue (struct ppp *ppp, unsigned short proto, u_char * data, int len)
-{
- int totlen;
- register int current_idx;
-/*
- * The total length includes the protocol data.
- * Lock the user information buffer.
- */
- if (set_bit (0, &ppp->ubuf->locked)) {
- PRINTKN (1, (KERN_NOTICE "ppp_us_queue: can't get lock\n"));
- return 0;
- }
- current_idx = ppp->ubuf->head;
-
-#define PUTC(c) \
-{ \
- buf_base (ppp->ubuf) [current_idx++] = (u_char) (c);\
- current_idx &= ppp->ubuf->size; \
- if (current_idx == ppp->ubuf->tail) { \
- goto failure; \
- } \
-}
-
-/*
- * Insert the buffer length (not counted), the protocol, and the data
- */
- totlen = len + 2;
- PUTC (totlen >> 8);
- PUTC (totlen);
-
- PUTC (proto >> 8);
- PUTC (proto);
-
- while (len-- > 0) {
- PUTC (*data++);
- }
-#undef PUTC
-/*
- * The frame is complete. Update the head pointer and wakeup the pppd
- * process.
- */
- ppp->ubuf->head = current_idx;
+ /*
+ * 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;
+ }
- clear_bit (0, &ppp->ubuf->locked); /* Unlock the buffer header */
- wake_up_interruptible (&ppp->read_wait); /* select() processing */
- if (ppp->tty->fasync != NULL) {
- kill_fasync (ppp->tty->fasync, SIGIO); /* SIGIO processing */
+ /*
+ * Store the character and update the FCS.
+ */
+ p = skb_put(skb, 1);
+ *p = chr;
+ ppp->rfcs = PPP_FCS(ppp->rfcs, chr);
}
-
- PRINTKN (3, (KERN_INFO "ppp: successfully queued %d bytes\n", totlen));
- return 1;
-/*
- * The buffer is full. Unlock the header and return the failure condition.
- */
- failure:
- clear_bit (0, &ppp->ubuf->locked);
- PRINTKN (1, (KERN_NOTICE "ppp_us_queue: ran out of buffer space.\n"));
- return 0;
+ ppp->rpkt = skb;
}
/*************************************************************
- * 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.
+ * 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.
*************************************************************/
-/* read a PPP frame from the us_rbuff circular buffer,
- waiting if necessary
-*/
-
-static int
-ppp_tty_read (struct tty_struct *tty, struct file *file, u_char * buf,
- unsigned int nr)
-{
- struct ppp *ppp = (struct ppp *) tty->disc_data;
- u_char c;
- int len, indx;
-
-#define GETC(c) \
-{ \
- c = buf_base (ppp->ubuf) [ppp->ubuf->tail++]; \
- ppp->ubuf->tail &= ppp->ubuf->size; \
-}
-
-/*
- * Validate the pointer to the PPP structure
- */
- if (!ppp || ppp->magic != PPP_MAGIC) {
- PRINTKN (1, (KERN_ERR
- "ppp_tty_read: cannnot find ppp channel\n"));
- return -EIO;
- }
- CHECK_PPP (-ENXIO);
-
- PRINTKN (4, (KERN_DEBUG "ppp_tty_read: called %x num %u\n",
- (unsigned int) buf,
- nr));
/*
- * Acquire the read lock.
- */
- for (;;) {
- if (set_bit (0, &ppp->ubuf->locked) != 0) {
- PRINTKN (3, (KERN_DEBUG
- "ppp_tty_read: sleeping(ubuf)\n"));
-
- current->timeout = 0;
- current->state = TASK_INTERRUPTIBLE;
- schedule ();
-
- if (current->signal & ~current->blocked) {
- return -EINTR;
- }
- continue;
- }
-/*
- * 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 there is no length then wait for the data to arrive.
- */
- if (len == 0) {
- /* no data */
- clear_bit (0, &ppp->ubuf->locked);
- if (file->f_flags & O_NONBLOCK) {
- PRINTKN (4, (KERN_DEBUG
- "ppp_tty_read: no data (EWOULDBLOCK)\n"));
- return -EWOULDBLOCK;
- }
- current->timeout = 0;
- PRINTKN (3, (KERN_DEBUG
- "ppp_tty_read: sleeping(read_wait)\n"));
- interruptible_sleep_on (&ppp->read_wait);
- if (current->signal & ~current->blocked) {
- return -EINTR;
- }
- continue;
- }
-/*
- * Reset the time of the last read operation.
- */
- ppp->ddinfo.nip_rjiffies = jiffies;
- PRINTKN (4, (KERN_DEBUG "ppp_tty_read: len = %d\n", len));
-/*
- * Ensure that the frame will fit within the caller's buffer. If not, then
- * discard the frame from the input buffer and return an error to the caller.
- */
- if (len + 2 > nr) {
- /* Can't copy it, update us_rbuff_head */
- PRINTKN (1, (KERN_DEBUG
- "ppp: read of %u bytes too small for %d frame\n",
- nr, len + 2));
- ppp->ubuf->tail += len;
- ppp->ubuf->tail &= ppp->ubuf->size;
- clear_bit (0, &ppp->ubuf->locked);
- ppp->p.ppp_ierrors++;
- return -EOVERFLOW;
- }
-/*
- * Fake the insertion of the ADDRESS and CONTROL information because these
- * were not saved in the buffer.
- */
- put_fs_byte (PPP_ALLSTATIONS, buf++);
- put_fs_byte (PPP_UI, buf++);
- indx = len;
-/*
- * Copy the received data from the buffer to the caller's area.
- */
- while (indx-- > 0) {
- GETC (c);
- put_fs_byte (c, buf++);
- }
-/*
- * Release the lock and return the character count in the buffer area.
+ * Network device driver callback routines
*/
- clear_bit (0, &ppp->ubuf->locked);
- len += 2; /* Account for ADDRESS and CONTROL bytes */
- PRINTKN (3,
- (KERN_DEBUG "ppp_tty_read: passing %d bytes up\n", len));
- return len;
- }
-#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 */
-
-extern inline void
-ppp_stuff_char (struct ppp *ppp, register struct ppp_buffer *buf,
- register u_char chr)
-{
-/*
- * The buffer should not be full.
- */
- if ((buf->count < 0) || (buf->count > 3000)) {
- PRINTK ((KERN_DEBUG "ppp_stuff_char: %x %d\n",
- (unsigned int) buf->count,
- (unsigned int) buf->count))
- }
-/*
- * 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);
-}
+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 *);
-/*
- * write a frame with NR chars from BUF to TTY
- * we have to put the FCS field on ourselves
- */
+#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
-static int
-ppp_tty_write (struct tty_struct *tty, struct file *file, u_char * buf,
- unsigned int count)
-{
- struct ppp *ppp = (struct ppp *) tty->disc_data;
- int indx;
- unsigned short write_fcs;
-/*
- * Verify the pointer to the PPP data and that the tty is still in PPP mode.
- */
- if (!ppp || ppp->magic != PPP_MAGIC) {
- PRINTKN (1,(KERN_ERR "ppp_tty_write: cannot find ppp unit\n"));
- return -EIO;
- }
- CHECK_PPP (-ENXIO);
-/*
- * Detech a change in the transfer size
- */
- if (ppp->mtu != ppp->dev->mtu) { /* Someone has been ifconfigging */
- ppp_changedmtu (ppp,
- ppp->dev->mtu,
- ppp->mru);
- }
/*
- * Ensure that the caller does not wish to send too much.
+ * Information for the protocol decoder
*/
- if (count > PPP_MTU) {
- PRINTKN (1, (KERN_WARNING
- "ppp_tty_write: truncating user packet from %u to mtu %d\n",
- count, PPP_MTU));
- count = PPP_MTU;
- }
-/*
- * Print the buffer
- */
- if (ppp_debug >= 3) {
- ppp_print_buffer ("write frame", buf, count, USER_DS);
- }
-/*
- * lock this PPP unit so we will be the only writer;
- * sleep if necessary
- */
- while (lock_buffer (ppp->tbuf) != 0) {
- current->timeout = 0;
- PRINTKN (3, (KERN_DEBUG "ppp_tty_write: sleeping\n"));
- interruptible_sleep_on (&ppp->write_wait);
- if (current->signal & ~current->blocked) {
- return -EINTR;
- }
- }
-/*
- * OK, locked. Add the leading FLAG character to the buffer.
- */
- PRINTKN (4, (KERN_DEBUG "ppp_tty_write: acquired write lock\n"));
- ppp->tbuf->count = 0;
-#ifdef OPTIMIZE_FLAG_TIME
- if (jiffies - ppp->last_xmit > OPTIMIZE_FLAG_TIME) {
- ins_char (ppp->tbuf, PPP_FLAG);
- }
- ppp->last_xmit = jiffies;
-#else
- ins_char (ppp->tbuf, PPP_FLAG);
-#endif
-/*
- * Add the data for the frame to the buffer.
- */
- ppp->tbuf->fcs = PPP_INITFCS;
- indx = count;
- while (indx-- > 0) {
- register char chr = get_fs_byte (buf++);
- ppp_stuff_char (ppp, ppp->tbuf, chr);
- }
-/*
- * Add the trailing CRC and the final flag character
- */
- write_fcs = ppp->tbuf->fcs ^ 0xFFFF;
- ppp_stuff_char (ppp, ppp->tbuf, write_fcs);
- ppp_stuff_char (ppp, ppp->tbuf, write_fcs >> 8);
+typedef int (*pfn_proto) (struct ppp *, struct sk_buff *);
- PRINTKN (4, (KERN_DEBUG "ppp_tty_write: fcs is %hx\n", write_fcs));
-/*
- * Add the trailing FLAG character
- */
- ins_char (ppp->tbuf, PPP_FLAG);
-/*
- * Update the time and print the data to the debug log.
- */
- ppp->ddinfo.nip_sjiffies = jiffies;
+typedef struct ppp_proto_struct {
+ int proto;
+ pfn_proto func;
+} ppp_proto_type;
- if (ppp_debug >= 6) {
- ppp_print_buffer ("xmit buffer",
- buf_base (ppp->tbuf),
- ppp->tbuf->count,
- KERNEL_DS);
- } else {
- PRINTKN (4, (KERN_DEBUG
- "ppp_tty_write: writing %d chars\n", ppp->tbuf->count));
- }
-/*
- * Start the transmitter and the request is complete.
- */
- ppp->p.ppp_obytes += ppp->tbuf->count;
- ++ppp->p.ppp_opackets;
+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 *);
- ppp_kick_tty (ppp, ppp->tbuf);
- return ((int) count);
-}
+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 !!! */
+};
/*
- * Process the IOCTL event for the tty device.
+ * Called when the PPP network interface device is actually created.
*/
-
static int
-ppp_tty_ioctl (struct tty_struct *tty, struct file *file, unsigned int param2,
- unsigned long param3)
+ppp_init_dev (struct device *dev)
{
- struct ppp *ppp = (struct ppp *) tty->disc_data;
- register int temp_i = 0;
- int error;
-/*
- * Verify the status of the PPP device.
- */
- if (!ppp || ppp->magic != PPP_MAGIC) {
- PRINTK ((KERN_ERR
- "ppp_tty_ioctl: can't find PPP block from tty!\n"));
- return -EBADF;
- }
- CHECK_PPP (-ENXIO);
-/*
- * The user must have an euid of root to do these requests.
- */
- if (!suser ()) {
- return -EPERM;
- }
-/*
- * Set the MRU value
- */
- switch (param2) {
- case PPPIOCSMRU:
- error = verify_area (VERIFY_READ, (void *) param3,
- sizeof (temp_i));
- if (error == 0) {
- PRINTKN (3, (KERN_INFO
- "ppp_tty_ioctl: set mru to %x\n", temp_i));
- temp_i = (int) get_fs_long (param3);
- if (ppp->mru != temp_i) {
- ppp_changedmtu (ppp, ppp->dev->mtu, temp_i);
- }
- }
- break;
-/*
- * Fetch the flags
- */
- case PPPIOCGFLAGS:
- error = verify_area (VERIFY_WRITE, (void *) param3,
- sizeof (temp_i));
- if (error == 0) {
- 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;
+ 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
- put_fs_long ((long) temp_i, param3);
- PRINTKN (3, (KERN_DEBUG
- "ppp_tty_ioctl: get flags: addr %lx flags %x\n",
- param3, temp_i));
- }
- break;
-/*
- * Set the flags for the various options
- */
- case PPPIOCSFLAGS:
- error = verify_area (VERIFY_READ, (void *) param3,
- sizeof (temp_i));
- if (error == 0) {
- temp_i = (int) get_fs_long (param3);
- ppp->flags ^= ((ppp->flags ^ temp_i) & SC_MASK);
- PRINTKN (3, (KERN_INFO
- "ppp_tty_ioctl: set flags to %x\n", temp_i));
- }
- break;
-/*
- * Retrieve the transmit async map
- */
- case PPPIOCGASYNCMAP:
- error = verify_area (VERIFY_WRITE, (void *) param3,
- sizeof (temp_i));
- if (error == 0) {
- put_fs_long (ppp->xmit_async_map[0], param3);
- PRINTKN (3, (KERN_INFO
- "ppp_tty_ioctl: get asyncmap: addr %lx asyncmap %lx\n",
- param3, ppp->xmit_async_map[0]));
- }
- break;
-/*
- * Set the transmit async map
- */
- case PPPIOCSASYNCMAP:
- error = verify_area (VERIFY_READ, (void *) param3,
- sizeof (temp_i));
- if (error == 0) {
- ppp->xmit_async_map[0] = get_fs_long (param3);
- PRINTKN (3, (KERN_INFO
- "ppp_tty_ioctl: set xmit asyncmap %lx\n",
- ppp->xmit_async_map[0]));
- }
- break;
-/*
- * Set the receive async map
- */
- case PPPIOCSRASYNCMAP:
- error = verify_area (VERIFY_READ, (void *) param3,
- sizeof (temp_i));
- if (error == 0) {
- ppp->recv_async_map = get_fs_long (param3);
- PRINTKN (3, (KERN_INFO
- "ppp_tty_ioctl: set rcv asyncmap %lx\n",
- ppp->recv_async_map));
- }
- break;
-/*
- * Obtain the unit number for this device.
- */
- case PPPIOCGUNIT:
- error = verify_area (VERIFY_WRITE, (void *) param3,
- sizeof (temp_i));
- if (error == 0) {
- put_fs_long (ppp->dev->base_addr, param3);
- PRINTKN (3,
- (KERN_INFO "ppp_tty_ioctl: get unit: %d",
- ppp->dev->base_addr));
- }
- break;
-/*
- * Set the debug level
- */
- case PPPIOCSDEBUG:
- error = verify_area (VERIFY_READ, (void *) param3,
- sizeof (temp_i));
- if (error == 0) {
- ppp_debug = (int) get_fs_long (param3);
- ppp_debug_netpackets = (ppp_debug & 0xff00) >> 8;
- ppp_debug &= 0xff;
- PRINTKN (1, (KERN_INFO
- "ppp_tty_ioctl: set debug level %d, netpacket %d\n",
- ppp_debug, ppp_debug_netpackets));
- }
- break;
-/*
- * Get the debug level
- */
- case PPPIOCGDEBUG:
- error = verify_area (VERIFY_WRITE, (void *) param3,
- sizeof (temp_i));
- if (error == 0) {
- put_fs_long ((long) (ppp_debug |
- (ppp_debug_netpackets << 8)),
- param3);
-
- PRINTKN (3, (KERN_INFO
- "ppp_tty_ioctl: get debug level %d\n",
- ppp_debug | (ppp_debug_netpackets << 8)));
- }
- break;
-/*
- * Get the times since the last send/receive frame operation
- */
- case PPPIOCGTIME:
- error = verify_area (VERIFY_WRITE, (void *) param3,
- sizeof (struct ppp_ddinfo));
- if (error == 0) {
- struct ppp_ddinfo cur_ddinfo;
- unsigned long cur_jiffies = jiffies;
-
- /* change absolute times to relative times. */
- cur_ddinfo.ip_sjiffies = cur_jiffies - ppp->ddinfo.ip_sjiffies;
- cur_ddinfo.ip_rjiffies = cur_jiffies - ppp->ddinfo.ip_rjiffies;
- cur_ddinfo.nip_sjiffies = cur_jiffies - ppp->ddinfo.nip_sjiffies;
- cur_ddinfo.nip_rjiffies = cur_jiffies - ppp->ddinfo.nip_rjiffies;
-
- memcpy_tofs ((void *) param3, &cur_ddinfo,
- sizeof (struct ppp_ddinfo));
- PRINTKN (3, (KERN_INFO
- "ppp_tty_ioctl: read demand dial info\n"));
- }
- break;
-/*
- * Retrieve the extended async map
- */
- case PPPIOCGXASYNCMAP:
- error = verify_area (VERIFY_WRITE,
- (void *) param3,
- sizeof (ppp->xmit_async_map));
- if (error == 0) {
- memcpy_tofs ((void *) param3,
- ppp->xmit_async_map,
- sizeof (ppp->xmit_async_map));
- PRINTKN (3, (KERN_INFO
- "ppp_tty_ioctl: get xasyncmap: addr %lx\n",
- param3));
- }
- break;
-/*
- * Set the async extended map
- */
- case PPPIOCSXASYNCMAP:
- error = verify_area (VERIFY_READ, (void *) param3,
- sizeof (ppp->xmit_async_map));
- if (error == 0) {
- unsigned long temp_tbl[8];
-
- memcpy_fromfs (temp_tbl, (void *) param3,
- sizeof (ppp->xmit_async_map));
- temp_tbl[1] = 0x00000000;
- temp_tbl[2] &= ~0x40000000;
- temp_tbl[3] |= 0x60000000;
-
- if ((temp_tbl[2] & temp_tbl[3]) != 0 ||
- (temp_tbl[4] & temp_tbl[5]) != 0 ||
- (temp_tbl[6] & temp_tbl[7]) != 0) {
- error = -EINVAL;
- } else {
- memcpy (ppp->xmit_async_map, temp_tbl,
- sizeof (ppp->xmit_async_map));
- PRINTKN (3, (KERN_INFO
- "ppp_tty_ioctl: set xasyncmap\n"));
- }
- }
- break;
-/*
- * Set the maximum VJ header compression slot number.
- */
- case PPPIOCSMAXCID:
- error = verify_area (VERIFY_READ, (void *) param3,
- sizeof (temp_i));
- if (error == 0) {
- temp_i = (int) get_fs_long (param3) + 1;
- PRINTKN (3, (KERN_INFO
- "ppp_tty_ioctl: set maxcid to %d\n",
- temp_i));
- if (ppp->slcomp != NULL) {
- slhc_free (ppp->slcomp);
- }
- ppp->slcomp = slhc_init (temp_i, temp_i);
-
- if (ppp->slcomp == NULL) {
- PRINTKN (1, (KERN_ERR
- "ppp: no space for compression buffers!\n"));
- ppp_release (ppp);
- error = -ENOMEM;
- }
- }
- 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;
-/*
- * All other ioctl() events will come here.
- */
- default:
- PRINTKN (1, (KERN_ERR
- "ppp_tty_ioctl: invalid ioctl: %x, addr %lx\n",
- param2,
- param3));
-
- error = -ENOIOCTLCMD;
- break;
- }
- return error;
-}
-
-/*
- * TTY callback.
- *
- * Process the select() statement for the PPP device.
- */
-static int
-ppp_tty_select (struct tty_struct *tty, struct inode *inode,
- struct file *filp, int sel_type, select_table * wait)
-{
- struct ppp *ppp = (struct ppp *) tty->disc_data;
- int result = 1;
-/*
- * Verify the status of the PPP device.
- */
- if (!ppp || ppp->magic != PPP_MAGIC) {
- PRINTK ((KERN_ERR
- "ppp_tty_select: can't find PPP block from tty!\n"));
- return -EBADF;
- }
- CHECK_PPP (0);
-/*
- * Branch on the type of select mode. A read request must lock the user
- * buffer area.
- */
- switch (sel_type) {
- case SEL_IN:
- if (set_bit (0, &ppp->ubuf->locked) == 0) {
- /* Test for the presence of data in the queue */
- if (ppp->ubuf->head != ppp->ubuf->tail) {
- clear_bit (0, &ppp->ubuf->locked);
- break;
- }
- clear_bit (0, &ppp->ubuf->locked);
- } /* fall through */
- /*
- * Exceptions or read errors.
- */
- case SEL_EX:
- /* Is this a pty link and the remote disconnected? */
- if (tty->flags & (1 << TTY_SLAVE_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;
-/*
- * Write mode. A write is allowed if there is no current transmission.
- */
- case SEL_OUT:
- if (ppp->tbuf->locked != 0) {
- select_wait (&ppp->write_wait, wait);
- result = 0;
- }
- break;
+ /* 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
- return result;
-}
+ dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
-/*************************************************************
- * 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...).
- *************************************************************/
+ return 0;
+}
/*
* Callback from the network layer when the device goes up.
static int
ppp_dev_open (struct device *dev)
{
- struct ppp *ppp = &ppp_ctrl[dev->base_addr];
+ struct ppp *ppp = dev2ppp(dev);
- /* reset POINTOPOINT every time, since dev_close zaps it! */
- dev->flags |= IFF_POINTOPOINT;
-
- if (ppp->tty == NULL) {
- PRINTKN (1,
- (KERN_ERR "ppp: %s not connected to a TTY! can't go open!\n",
- dev->name));
+ if (!ppp->inuse || ppp2tty(ppp) == NULL) {
+ printk(KERN_ERR "ppp: %s not active\n", dev->name);
return -ENXIO;
}
- PRINTKN (2, (KERN_INFO "ppp: channel %s going up for IP packets!\n",
- dev->name));
+ MOD_INC_USE_COUNT;
- CHECK_PPP (-ENXIO);
return 0;
}
static int
ppp_dev_close (struct device *dev)
{
- struct ppp *ppp = &ppp_ctrl[dev->base_addr];
+ struct ppp *ppp = dev2ppp (dev);
+
+ CHECK_PPP_MAGIC(ppp);
+
+ MOD_DEC_USE_COUNT;
- if (ppp->tty == NULL) {
- PRINTKN (1,
- (KERN_ERR "ppp: %s not connected to a TTY! can't go down!\n",
- dev->name));
- return -ENXIO;
- }
-/*
- * We don't do anything about the device going down. It is not important
- * for us.
- */
- PRINTKN (2, (KERN_INFO "ppp: channel %s going down for IP packets!\n",
- dev->name));
- CHECK_PPP (-ENXIO);
return 0;
}
-/*
- * IOCTL operation to read the version of the driver.
- */
-
-static int
-ppp_dev_ioctl_version (struct ppp *ppp, struct ifreq *ifr)
+static inline void
+get_vj_stats(struct vjstat *vj, struct slcompress *slc)
{
- int error;
- int len;
- char *result;
-/*
- * Must have write access to the buffer.
- */
- result = (char *) ifr->ifr_ifru.ifru_data;
- len = strlen (szVersion) + 1;
- error = verify_area (VERIFY_WRITE, result, len);
-/*
- * Move the version data
- */
- if (error == 0)
- memcpy_tofs (result, szVersion, len);
-
- return error;
+ 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;
}
/*
- * IOCTL to read the statistics for the pppstats program.
+ * Callback from the network layer to process the sockioctl functions.
*/
-
static int
-ppp_dev_ioctl_stats (struct ppp *ppp, struct ifreq *ifr)
+ppp_dev_ioctl (struct device *dev, struct ifreq *ifr, int cmd)
{
- struct ppp_stats *result, temp;
- int error;
-/*
- * Must have write access to the buffer.
- */
- result = (struct ppp_stats *) ifr->ifr_ifru.ifru_data;
- error = verify_area (VERIFY_WRITE,
- result,
- sizeof (temp));
-/*
- * Supply the information for the caller. First move the version data
- * then move the ppp stats; and finally the vj stats.
- */
- if (error == 0) {
- memset (&temp, 0, sizeof(temp));
- memcpy (&temp.p, &ppp->p, sizeof (struct pppstat));
-/*
- * Header Compression statistics
- */
- if (ppp->slcomp != NULL) {
- temp.vj.vjs_packets = ppp->slcomp->sls_o_nontcp +
- ppp->slcomp->sls_o_tcp;
- 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;
- }
-/*
- * Frame data compression statistics
- */
-#ifdef PPP_COMPRESS
- if (ppp->sc_xc_state != NULL)
- (*ppp->sc_xcomp->comp_stat) (ppp->sc_xc_state,
- &temp.c);
+ 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,
- &temp.d);
-#endif /* PPP_COMPRESS */
+ (*ppp->sc_rcomp->decomp_stat)
+ (ppp->sc_rc_state, &u.cstats.d);
+ nb = sizeof(u.cstats);
+ break;
-/*
- * Move the data to the caller's buffer
- */
- memcpy_tofs (result, &temp, sizeof (temp));
+ case SIOCGPPPVER:
+ strcpy(u.vers, szVersion);
+ nb = strlen(u.vers) + 1;
+ break;
+
+ default:
+ return -EINVAL;
}
- return error;
+
+ if (COPY_TO_USER((void *) ifr->ifr_ifru.ifru_data, &u, nb))
+ return -EFAULT;
+ return 0;
}
/*
- * Callback from the network layer to process the sockioctl functions.
+ * Process the generic PPP ioctls, i.e. those which are not specific
+ * to any particular type of hardware link.
*/
-
static int
-ppp_dev_ioctl (struct device *dev, struct ifreq *ifr, int cmd)
+ppp_ioctl(struct ppp *ppp, unsigned int param2, unsigned long param3)
{
- struct ppp *ppp = &ppp_ctrl[dev->base_addr];
- int error;
-/*
- * Process the requests
- */
- switch (cmd) {
- case SIOCGPPPSTATS:
- error = ppp_dev_ioctl_stats (ppp, ifr);
+ 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 SIOCGPPPVER:
- error = ppp_dev_ioctl_version (ppp, ifr);
+ 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;
- default:
+ 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;
}
/*
- * Send a frame to the remote.
+ * Process the set-compression ioctl.
*/
-
-int
-ppp_dev_xmit (sk_buff *skb, struct device *dev)
+static int
+ppp_set_compression (struct ppp *ppp, struct ppp_option_data *odp)
{
- struct tty_struct *tty;
- struct ppp *ppp;
- u_char *data;
- unsigned short proto;
- int len;
- unsigned short write_fcs;
-/*
- * just a little sanity check.
- */
- if (skb == NULL) {
- PRINTKN (3, (KERN_WARNING "ppp_dev_xmit: null packet!\n"));
- return 0;
+ 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;
+}
+
/*
- * Fetch the poitners to the data
+ * 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.
*/
- ppp = &ppp_ctrl[dev->base_addr];
- tty = ppp->tty;
- data = (u_char *) (&skb[1]);
- len = skb->len;
- proto = PPP_IP;
- PRINTKN (4, (KERN_DEBUG "ppp_dev_xmit [%s]: skb %lX busy %d\n",
- dev->name,
- (unsigned long int) skb, ppp->wbuf->locked));
+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;
- CHECK_PPP (0);
-/*
- * Validate the tty interface
- */
- do {
- if (tty == NULL) {
- PRINTKN (1,
- (KERN_ERR "ppp_dev_xmit: %s not connected to a TTY!\n",
- dev->name));
- break;
+ 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);
}
-/*
- * Ensure that the PPP device is still up
- */
- if (!(dev->flags & IFF_UP)) {
- PRINTKN (1, (KERN_WARNING
- "ppp_dev_xmit: packet sent on interface %s,"
- " which is down for IP\n",
- dev->name));
+ 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;
}
-/*
- * Detect a change in the transfer size
- */
- if (ppp->mtu != ppp->dev->mtu) {
- ppp_changedmtu (ppp,
- ppp->dev->mtu,
- ppp->mru);
+
+ /*
+ * 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);
}
-/*
- * Fetch the length from the IP header.
- */
- if (len < sizeof (struct iphdr)) {
- PRINTKN (0, (KERN_ERR
- "ppp_dev_xmit: given runt packet, ignoring\n"));
+ 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;
+ }
}
- len = ntohs (((struct iphdr *) skb_data(skb))->tot_len);
+ break;
+ }
+ restore_flags(flags);
+}
+
/*
- * Acquire the lock on the transmission buffer. If the buffer was busy then
- * mark the device as busy and return "failure to send, try back later" error.
+ * CCP is down; free (de)compressor state if necessary.
*/
- if (lock_buffer (ppp->wbuf) != 0) {
- dev->tbusy = 1;
- return 1;
- }
+
+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
+ *************************************************************/
+
/*
- * At this point, the buffer will be transmitted. There is no other exit.
- *
- * Try to compress the header.
+ * On entry, a received frame is in skb.
+ * Check it and dispose as appropriate.
*/
- if (ppp->flags & SC_COMP_TCP) {
- /* last 0 argument says don't compress connection ID */
- len = slhc_compress (ppp->slcomp, data, len,
- buf_base (ppp->cbuf),
- &data, 0);
-
- if (data[0] & SL_TYPE_COMPRESSED_TCP) {
- proto = PPP_VJC_COMP;
+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 {
- if (data[0] >= SL_TYPE_UNCOMPRESSED_TCP) {
- proto = PPP_VJC_UNCOMP;
- data[0] = (data[0] & 0x0f) | 0x40;
+ /*
+ * 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;
}
}
- }
- if (ppp_debug_netpackets) {
- struct iphdr *iph = (struct iphdr *) skb_data(skb);
- PRINTK ((KERN_DEBUG "%s ==> proto %x len %d src %x "
- "dst %x proto %d\n",
- dev->name, (int) proto, (int) len, (int) iph->saddr,
- (int) iph->daddr, (int) iph->protocol))
+
+ } 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;
+}
+
/*
- * Insert the leading FLAG character
+ * An input error has been detected, so we need to inform
+ * the VJ decompressor.
*/
- ppp->wbuf->count = 0;
+static void
+ppp_receive_error(struct ppp *ppp)
+{
+ CHECK_PPP_VOID();
-#ifdef OPTIMIZE_FLAG_TIME
- if (jiffies - ppp->last_xmit > OPTIMIZE_FLAG_TIME) {
- ins_char (ppp->wbuf, PPP_FLAG);
- }
- ppp->last_xmit = jiffies;
-#else
- ins_char (ppp->wbuf, PPP_FLAG);
-#endif
+ 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;
+}
- ppp->wbuf->fcs = PPP_INITFCS;
/*
- * Insert the address and control data
+ * Process the receipt of an IPX frame
*/
- if (!(ppp->flags & SC_COMP_AC)) {
- ppp_stuff_char (ppp, ppp->wbuf, PPP_ALLSTATIONS);
- ppp_stuff_char (ppp, ppp->wbuf, PPP_UI);
- }
-/*
- * Insert the protocol.
- */
- if (!(ppp->flags & SC_COMP_PROT) || (proto & 0xff00)) {
- ppp_stuff_char (ppp, ppp->wbuf, proto >> 8);
- }
- ppp_stuff_char (ppp, ppp->wbuf, proto);
+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;
+}
+
/*
- * Insert the data
+ * Process the receipt of an Appletalk frame
*/
- while (len-- > 0) {
- ppp_stuff_char (ppp, ppp->wbuf, *data++);
- }
+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;
+}
+
/*
- * Add the trailing CRC and the final flag character
+ * Process the receipt of an VJ Compressed frame
*/
- write_fcs = ppp->wbuf->fcs ^ 0xFFFF;
- ppp_stuff_char (ppp, ppp->wbuf, write_fcs);
- ppp_stuff_char (ppp, ppp->wbuf, write_fcs >> 8);
+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);
+}
- PRINTKN (4,
- (KERN_DEBUG "ppp_dev_xmit: fcs is %hx\n", write_fcs));
/*
- * Add the trailing flag character
+ * Process the receipt of an VJ Un-compressed frame
*/
- ins_char (ppp->wbuf, PPP_FLAG);
+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);
+}
+
/*
- * Update the times for the transmission.
+ * Receive all unclassified protocols.
*/
- ppp->ddinfo.ip_sjiffies = jiffies;
+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;
+}
+
/*
- * Print the buffer
+ * 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.
*/
- if (ppp_debug >= 6) {
- ppp_print_buffer ("xmit buffer", buf_base (ppp->wbuf),
- ppp->wbuf->count, KERNEL_DS);
+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 {
- PRINTKN (4, (KERN_DEBUG
- "ppp_dev_xmit: writing %d chars\n",
- ppp->wbuf->count));
+ /*
+ * 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 block to the tty driver.
- */
- ppp->p.ppp_obytes += ppp->wbuf->count;
- ++ppp->p.ppp_opackets;
- ppp_kick_tty (ppp, ppp->wbuf);
}
- while (0);
+
+ /*
+ * 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");
+ }
+}
+
/*
- * This is the end of the transmission. Release the buffer.
+ * Apply VJ TCP header compression to a packet.
*/
- dev_kfree_skb (skb, FREE_WRITE);
- return 0;
+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 struct enet_statistics *
-ppp_dev_stats (struct device *dev)
+static inline void
+ppp_send_frames(struct ppp *ppp)
{
- struct ppp *ppp = &ppp_ctrl[dev->base_addr];
- static struct enet_statistics ppp_stats;
-
- ppp_stats.rx_packets = ppp->p.ppp_ipackets;
- ppp_stats.rx_errors = ppp->p.ppp_ierrors;
- ppp_stats.rx_dropped = ppp->p.ppp_ierrors;
- ppp_stats.rx_fifo_errors = 0;
- ppp_stats.rx_length_errors = 0;
- ppp_stats.rx_over_errors = 0;
- ppp_stats.rx_crc_errors = 0;
- ppp_stats.rx_frame_errors = 0;
- ppp_stats.tx_packets = ppp->p.ppp_opackets;
- ppp_stats.tx_errors = ppp->p.ppp_oerrors;
- ppp_stats.tx_dropped = 0;
- ppp_stats.tx_fifo_errors = 0;
- ppp_stats.collisions = 0;
- ppp_stats.tx_carrier_errors = 0;
- ppp_stats.tx_aborted_errors = 0;
- ppp_stats.tx_window_errors = 0;
- ppp_stats.tx_heartbeat_errors = 0;
-
- PRINTKN (3, (KERN_INFO "ppp_dev_stats called"));
- return &ppp_stats;
+ 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);
+ }
}
-#ifdef NEW_SKBUFF
/*
- * The PPP protocol is currently pure IP (no IPX yet). This defines
- * the protocol layer which is blank since the driver does all the
- * cooking.
+ * Called from the hardware (tty) layer when it can accept
+ * another packet.
*/
-
-static int ppp_dev_input (struct protocol *self, struct protocol *lower,
- sk_buff *skb, void *saddr, void *daddr)
+static void
+ppp_output_wakeup(struct ppp *ppp)
{
- return protocol_pass_demultiplex(self, NULL, skb, NULL, NULL);
+ 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);
}
-static int ppp_dev_output (struct protocol *self, sk_buff *skb, int type,
- int subid, void *saddr, void *daddr, void *opt)
+/*
+ * Send a control frame (from pppd).
+ */
+static void
+ppp_send_ctrl(struct ppp *ppp, struct sk_buff *skb)
{
- if(skb->dev==NULL)
- {
- printk("ppp_dev_output: No device.\n");
- kfree_skb(skb, FREE_WRITE);
- return -1;
- }
- dev_queue_xmit(skb, skb->dev, skb->priority);
- return 0;
+ 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);
}
-static int ppp_dev_getkey(int protocol, int subid, unsigned char *key)
+
+/*************************************************************
+ * 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)
{
- switch (protocol)
- {
- case ETH_P_IP:
+ 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;
}
- return -EAFNOSUPPORT;
+ /*
+ * 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;
}
-#else
-
+#if LINUX_VERSION_CODE < VERSION(2,1,15)
/*
- * Called to enquire about the type of the frame in the buffer. Return
- * ETH_P_IP for an IP frame, ETH_P_IPX for an IPX frame.
+ * Null hard_header and header_rebuild routines.
*/
-
-static unsigned short
-ppp_dev_type (sk_buff *skb, struct device *dev)
+static int ppp_dev_header(struct sk_buff *skb, struct device *dev,
+ unsigned short type, void *daddr,
+ void *saddr, unsigned int len)
{
- return (htons (ETH_P_IP));
+ return 0;
}
-static int
-ppp_dev_header (u_char * buff, struct device *dev, unsigned short type,
- void *daddr, void *saddr, unsigned len, sk_buff *skb)
+static int ppp_dev_rebuild(void *eth, struct device *dev,
+ unsigned long raddr, struct sk_buff *skb)
{
- return (0);
+ return 0;
}
+#endif /* < 2.1.15 */
-static int
-ppp_dev_rebuild (void *buff, struct device *dev, unsigned long raddr,
- sk_buff *skb)
+/*
+ * Generate the statistic information for the /proc/net/dev listing.
+ */
+static struct net_device_stats *
+ppp_dev_stats (struct device *dev)
{
- return (0);
-}
+ 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.
*************************************************************/
-/* allocate a PPP channel */
+/* 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)
+ppp_alloc(void)
{
- int i;
- for (i = 0; i < PPP_NRUNIT; i++) {
- if (!set_bit (0, &ppp_ctrl[i].inuse)) {
- return &ppp_ctrl[i];
+ 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 */
}
}
- return NULL;
+
+ /*
+ * 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;
}
/*
- * 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;
+ 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 u_char * out, u_char * in, int count)
+ppp_print_hex (register __u8 * out, const __u8 * in, int count)
{
- register u_char next_ch;
+ register __u8 next_ch;
static char hex[] = "0123456789ABCDEF";
while (count-- > 0) {
- next_ch = (u_char) get_fs_byte (in);
+ next_ch = *in++;
*out++ = hex[(next_ch >> 4) & 0x0F];
*out++ = hex[next_ch & 0x0F];
++out;
- ++in;
}
}
static void
-ppp_print_char (register u_char * out, u_char * in, int count)
+ppp_print_char (register __u8 * out, const __u8 * in, int count)
{
- register u_char next_ch;
+ register __u8 next_ch;
while (count-- > 0) {
- next_ch = (u_char) get_fs_byte (in);
+ next_ch = *in++;
- if (next_ch < 0x20 || next_ch > 0x7e) {
+ if (next_ch < 0x20 || next_ch > 0x7e)
*out++ = '.';
- } else {
+ else {
*out++ = next_ch;
- if (next_ch == '%') { /* printk/syslogd has a bug !! */
+ if (next_ch == '%') /* printk/syslogd has a bug !! */
*out++ = '%';
- }
}
- ++in;
}
*out = '\0';
}
static void
-ppp_print_buffer (const u_char * name, u_char * buf, int count, int seg)
+ppp_print_buffer (const char *name, const __u8 *buf, int count)
{
- u_char line[44];
- int old_fs = get_fs ();
+ __u8 line[44];
- set_fs (seg);
+ if (name != NULL)
+ printk(KERN_DEBUG "ppp: %s, count = %d\n", name, count);
- if (name != (u_char *) NULL) {
- PRINTK ((KERN_DEBUG "ppp: %s, count = %d\n", name, count));
- }
while (count > 8) {
- memset (line, ' ', sizeof (line));
+ 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;
}
if (count > 0) {
- memset (line, ' ', sizeof (line));
+ 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);
+ }
+}
+
+/*************************************************************
+ * 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);
}
- set_fs (old_fs);
}
+#endif
projects / ppp.git / blobdiff