X-Git-Url: http://git.ozlabs.org/?p=ppp.git;a=blobdiff_plain;f=linux%2Fppp.c;h=cd7e605ac1bf771bfa91847f3fc3819c99165e71;hp=32d5fa604aa1a9c6ea5054c9f31094ca8413e05e;hb=6bca842794ae41bfc71bdf27cde3bf6ecd843540;hpb=b07a2a0e2055cb2ba2b3addd5c50f2c9682a0777 diff --git a/linux/ppp.c b/linux/ppp.c index 32d5fa6..cd7e605 100644 --- a/linux/ppp.c +++ b/linux/ppp.c @@ -1,8 +1,17 @@ /* - PPP for Linux - - $Id: ppp.c,v 1.1 1994/05/27 00:55:25 paulus Exp $ -*/ + * PPP for Linux + * + * ==PPPVERSION 2.1.3== + * + * NOTE TO MAINTAINERS: + * If you modify this file at all, increment the last number above. + * ppp.c is shipped with a PPP distribution as well as with the kernel; + * if everyone increases the PPPVERSION 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: @@ -18,21 +27,34 @@ Flags for this module (any combination is acceptable for testing.): - NET02D - Define if using Net-2-Debugged in kernels earler - than v1.1.4. - - NEW_TTY_DRIVERS - Define if using new Ted Ts'o's alpha TTY drivers - from tsx-11.mit.edu. From Ted Ts'o. - - OPTIMIZE_FLAG_TIME - Number of jiffies to force sending of leading flag + 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 - flag is always sent. + 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. + + PPP_COMPRESS - Enable the PPP compression protocol. This protocol + is under contention with Motorolla's patent, so use + with caution. + + NEW_SKBUFF - Use NET3.020 sk_buff's */ -/* #define NET02D /* */ -/* #define NEW_TTY_DRIVERS /* */ -#define OPTIMIZE_FLAG_TIME ((HZ * 3)/2) /* */ +/* #define NEW_SKBUFF 1 */ +#define OPTIMIZE_FLAG_TIME ((HZ * 3)/2) +#define CHECK_CHARACTERS 1 +#define PPP_COMPRESS 1 + +/* $Id: ppp.c,v 1.5 1995/06/12 11:36:53 paulus Exp $ + * Added dynamic allocation of channels to eliminate + * compiled-in limits on the number of channels. + * + * Dynamic channel allocation code Copyright 1995 Caldera, Inc., + * released under the GNU General Public License Version 2. + */ #include #include @@ -45,306 +67,558 @@ #include #include #include -#include /* to get the struct task_struct */ -#include /* used in new tty drivers */ -#include /* used in new tty drivers */ +#include /* to get the struct task_struct */ +#include /* used in new tty drivers */ +#include /* used in new tty drivers */ #include #include #include - -#ifdef NET02D /* v1.1.4 net code and earlier */ -#include -#include -#define skb_queue_head_init(buf) *(buf) = NULL -#else /* v1.1.5 and later */ +#include +#include +#include +#include #include #include -#endif +#include +#include -#include +#ifdef NEW_SKBUFF +#include +#else +#define skb_data(skb) ((unsigned char *) (skb)->data) +typedef struct sk_buff sk_buff; +#endif #include #include -#include +#include #include "slhc.h" +#include +#include +#include +#include + +#ifdef MODULE +#include +#include +#define STATIC static +#else +#define MOD_INC_USE_COUNT while(0) { } +#define MOD_DEC_USE_COUNT while(0) { } +#endif /* def MODULE */ + +#ifdef PPP_COMPRESS +#undef PACKETPTR +#define PACKETPTR 1 +#include +#undef PACKETPTR + +#define bsd_decompress (*ppp->sc_rcomp->decompress) +#define bsd_compress (*ppp->sc_xcomp->compress) +#endif -#include -#ifndef ARPHRD_PPP -#define ARPHRD_PPP 0 +#ifndef PPP_IPX +#define PPP_IPX 0x2b /* IPX protocol over PPP */ +#endif + +#ifndef PPP_LQR +#define PPP_LQR 0xc025 /* Link Quality Reporting Protocol */ +#endif + +/* + * Local functions + */ + +static void ppp_init_ctrl_blk (register struct ppp *); +static void ppp_kick_tty (struct ppp *, struct ppp_buffer *bfr); +static int ppp_doframe (struct ppp *); +static struct ppp *ppp_alloc (void); +static void ppp_print_buffer (const u_char *, u_char *, 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_proto_ccp (struct ppp *ppp, u_char *dp, int len, int rcvd); + +static int rcv_proto_ip (struct ppp *, u_short, u_char *, int); +static int rcv_proto_ipx (struct ppp *, u_short, u_char *, int); +static int rcv_proto_vjc_comp (struct ppp *, u_short, u_char *, int); +static int rcv_proto_vjc_uncomp (struct ppp *, u_short, u_char *, int); +static int rcv_proto_unknown (struct ppp *, u_short, u_char *, int); +static int rcv_proto_ccp (struct ppp *, u_short, u_char *, int); +static int rcv_proto_lqr (struct ppp *, u_short, u_char *, int); +static void ppp_doframe_lower (struct ppp *, u_char *, int); +static int ppp_doframe (struct ppp *); + +/* + * List of compressors we know about. + * We leave some space so maybe we can modload compressors. + */ + +#ifdef PPP_COMPRESS +extern struct compressor ppp_bsd_compress; + +struct compressor *ppp_compressors[8] = { + &ppp_bsd_compress, + NULL +}; +#endif /* PPP_COMPRESS */ + +#define ins_char(pbuf,c) (buf_base(pbuf) [(pbuf)->count++] = (u_char)(c)) + +/* + * The "main" procedure to the ppp device + */ + +int ppp_init (struct device *); + +/* + * Network device driver callback routines + */ + +static int ppp_dev_open (struct device *); +static int ppp_dev_ioctl (struct device *dev, struct ifreq *ifr, int cmd); +static int ppp_dev_close (struct device *); +static int ppp_dev_xmit (sk_buff *, struct device *); +static struct 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); +#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 *); #endif +/* + * 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 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, + 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) (unsigned char) (c)) < 0x20) && \ +#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))) -int ppp_debug = 2; -int ppp_debug_netpackets = 0; +#define tty2ppp(tty) ((struct ppp *) (tty->disc_data)) +#define dev2ppp(dev) ((struct ppp *) (dev->priv)) +#define ppp2tty(ppp) ((struct tty_struct *) ppp->tty) +#define ppp2dev(ppp) ((struct device *) ppp->dev) -/* Define this string only once for all macro envocations */ -static char ppp_warning[] = KERN_WARNING "PPP: ALERT! not INUSE! %d\n"; +struct ppp_hdr { + unsigned char address; + unsigned char control; + unsigned char protocol[2]; +}; + +#define PPP_HARD_HDR_LEN (sizeof (struct ppp_hdr)) + +#if 1 +typedef struct ppp_ctrl { + struct ppp_ctrl *next; /* Next structure in the list */ + char name [8]; /* Name of the device */ + struct ppp ppp; /* PPP control table */ + struct device dev; /* Device information table */ +} ppp_ctrl_t; -int ppp_init(struct device *); -static void ppp_init_ctrl_blk(struct ppp *); -static int ppp_dev_open(struct device *); -static int ppp_dev_close(struct device *); -static void ppp_kick_tty(struct ppp *); +static ppp_ctrl_t *ppp_list = NULL; + +#define ctl2ppp(ctl) (struct ppp *) &ctl->ppp +#define ctl2dev(ctl) (struct device *) &ctl->dev +#undef PPP_NRUNIT -#ifdef NEW_TTY_DRIVERS -#define ppp_find(tty) ((struct ppp *) tty->disc_data) #else -static void ppp_output_done(void *); -static void ppp_unesc(struct ppp *ppp, unsigned char *c, int n); -static struct ppp *ppp_find(struct tty_struct *); + +#define PPP_NRUNIT 4 +static struct ppp ppp_ctrl[PPP_NRUNIT]; +#undef dev2ppp +#define dev2ppp(dev) ((struct ppp *) &ppp_ctrl[dev->base_addr]) #endif -static void ppp_doframe(struct ppp *); -static int ppp_do_ip(struct ppp *, unsigned short, unsigned char *, int); -static int ppp_us_queue(struct ppp *, unsigned short, unsigned char *, int); -static int ppp_xmit(struct sk_buff *, struct device *); -static unsigned short ppp_type_trans(struct sk_buff *, struct device *); - -#ifdef NET02D -static int ppp_header(unsigned char *buff, struct device *dev, - unsigned short type, unsigned long daddr, - unsigned long saddr, unsigned len); -static int ppp_rebuild_header(void *buff, struct device *dev); -static void ppp_add_arp(unsigned long addr, struct sk_buff *skb, - struct device *dev); -#else -static int ppp_header(unsigned char *, struct device *, unsigned short, - void *, void *, unsigned, struct sk_buff *); -static int ppp_rebuild_header(void *, struct device *, unsigned long, - struct sk_buff *); +/* 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 char szVersion[] = PPP_VERSION; + +#ifdef NEW_SKBUFF +static struct protocol proto_ppp; #endif -static struct enet_statistics *ppp_get_stats (struct device *); -static struct ppp *ppp_alloc(void); -static int ppp_lock(struct ppp *); -static void ppp_unlock(struct ppp *); -static void ppp_add_fcs(struct ppp *); -static int ppp_check_fcs(struct ppp *); -static void ppp_print_buffer(const char *,char *,int,int); - -static int ppp_read(struct tty_struct *, struct file *, unsigned char *, - unsigned int); -static int ppp_write(struct tty_struct *, struct file *, unsigned char *, - unsigned int); -static int ppp_ioctl(struct tty_struct *, struct file *, unsigned int, - unsigned long); -static int ppp_select(struct tty_struct *tty, struct inode * inode, - struct file * filp, int sel_type, select_table * wait); -static int ppp_open(struct tty_struct *); -static void ppp_close(struct tty_struct *); - -#ifdef NEW_TTY_DRIVERS -static void ppp_receive_buf(struct tty_struct *tty, unsigned char *cp, - char *fp, int count); -static void ppp_write_wakeup(struct tty_struct *tty); -#else -static void ppp_tty_input_ready(struct tty_struct *); +/* + * Information for the protocol decoder + */ + +typedef int (*pfn_proto) (struct ppp *, u_short, u_char *, int); + +typedef struct ppp_proto_struct { + int proto; + pfn_proto func; +} ppp_proto_type; + +ppp_proto_type proto_list[] = { + { PPP_IP, rcv_proto_ip }, + { PPP_IPX, rcv_proto_ipx }, + { PPP_VJC_COMP, rcv_proto_vjc_comp }, + { PPP_VJC_UNCOMP, rcv_proto_vjc_uncomp }, + { PPP_LQR, rcv_proto_lqr }, +#ifdef PPP_COMPRESS + { PPP_CCP, rcv_proto_ccp }, #endif + { 0, rcv_proto_unknown } /* !!! MUST BE LAST !!! */ +}; /* FCS table from RFC1331 */ -static unsigned short fcstab[256] = { - 0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf, - 0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7, - 0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e, - 0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876, - 0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd, - 0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5, - 0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c, - 0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974, - 0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb, - 0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3, - 0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a, - 0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72, - 0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9, - 0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1, - 0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738, - 0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70, - 0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7, - 0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff, - 0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036, - 0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e, - 0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5, - 0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd, - 0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134, - 0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c, - 0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3, - 0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb, - 0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232, - 0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a, - 0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1, - 0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9, - 0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330, - 0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78 - }; - -struct tty_ldisc ppp_ldisc; +static unsigned short fcstab[256] = +{ + 0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf, + 0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7, + 0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e, + 0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876, + 0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd, + 0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5, + 0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c, + 0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974, + 0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb, + 0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3, + 0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a, + 0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72, + 0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9, + 0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1, + 0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738, + 0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70, + 0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7, + 0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff, + 0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036, + 0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e, + 0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5, + 0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd, + 0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134, + 0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c, + 0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3, + 0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb, + 0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232, + 0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a, + 0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1, + 0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9, + 0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330, + 0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78 +}; + +#ifdef CHECK_CHARACTERS +static unsigned paritytab[8] = +{ + 0x96696996, 0x69969669, 0x69969669, 0x96696996, + 0x69969669, 0x96696996, 0x96696996, 0x69969669 +}; +#endif -static struct ppp ppp_ctrl[PPP_NRUNIT]; +/* local function to store a value into the LQR frame */ +extern inline u_char * store_long (register u_char *p, register int value) { + *p++ = (u_char) (value >> 24); + *p++ = (u_char) (value >> 16); + *p++ = (u_char) (value >> 8); + *p++ = (u_char) value; + return p; +} /************************************************************* * INITIALIZATION *************************************************************/ -static int first_time = 1; - -/* called at boot time for each ppp device */ +/* This procedure is called once and once only to define who we are to + * the operating system and the various procedures that it may use in + * accessing the ppp protocol. + */ -int -ppp_init(struct device *dev) +static int +ppp_first_time (void) { - struct ppp *ppp; - int i; + static struct tty_ldisc ppp_ldisc; + int status; + +#ifdef PPP_NRUNIT +#define PPP_UNITS3(x) #x +#define PPP_UNITS2(x) PPP_UNITS3(x) +#define PPP_UNITS1(x) PPP_UNITS2(x) +#define PPP_UNITS "(" PPP_UNITS1(PPP_NRUNIT) " devices)" +#else +#define PPP_UNITS "(dynamic channel allocation)" +#endif + printk (KERN_INFO + "PPP: version %s " PPP_UNITS +#ifdef NEW_SKBUFF + " NEW_SKBUFF" +#endif + "\n", szVersion); +#undef PPP_UNITS +#undef PPP_UNITS1 +#undef PPP_UNITS2 +#undef PPP_UNITS3 + + printk (KERN_INFO + "TCP compression code copyright 1989 Regents of the " + "University of California\n"); + +#ifndef PPP_NRUNIT + printk (KERN_INFO + "PPP Dynamic channel allocation code copyright 1995 " + "Caldera, Inc.\n"); +#endif - ppp = &ppp_ctrl[dev->base_addr]; +/* + * Register the protocol for the device + */ - if (first_time) { - first_time = 0; +#ifdef NEW_SKBUFF + memset (&proto_ppp, 0, sizeof (proto_ppp)); - printk (KERN_INFO "PPP: version %s (%d channels)" -#ifdef NET02D - " NET02D" -#endif -#ifdef NEW_TTY_DRIVERS - " NEW_TTY_DRIVERS" -#endif -#ifdef OPTIMIZE_FLAG_TIME - " OPTIMIZE_FLAGS" + 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; + proto_ppp.header_space = 0; /* PPP_HARD_HDR_LEN; */ + + protocol_register(&proto_ppp); #endif - "\n", PPP_VERSION, 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.open = ppp_open; - ppp_ldisc.close = ppp_close; - ppp_ldisc.read = ppp_read; - ppp_ldisc.write = ppp_write; - ppp_ldisc.ioctl = ppp_ioctl; - ppp_ldisc.select = ppp_select; - -#ifdef NEW_TTY_DRIVERS - ppp_ldisc.magic = TTY_LDISC_MAGIC; - ppp_ldisc.receive_buf = ppp_receive_buf; - ppp_ldisc.write_wakeup = ppp_write_wakeup; + +/* + * Register the tty dicipline + */ + (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; + + 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; +} + +/************************************************************* + * INITIALIZATION + *************************************************************/ + +/* called when the device is actually created */ + +static int +ppp_init_dev (struct device *dev) +{ + int indx; +#ifdef NEW_SKBUFF + dev->default_protocol = &proto_ppp; /* Our protocol layer is PPP */ #else - ppp_ldisc.handler = ppp_tty_input_ready; + dev->hard_header = ppp_dev_header; + dev->type_trans = ppp_dev_type; + dev->rebuild_header = ppp_dev_rebuild; + dev->hard_header_len = 0; /* PPP_HARD_HDR_LEN; */ #endif - if ((i = tty_register_ldisc(N_PPP, &ppp_ldisc)) == 0) - printk(KERN_INFO "PPP line discipline registered.\n"); - else - printk(KERN_ERR "error registering line discipline: %d\n", i); - } - - /* 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->stats, '\0', sizeof (struct ppp_stats)); - - /* device INFO */ - dev->mtu = PPP_MTU; - dev->hard_start_xmit = ppp_xmit; - dev->open = ppp_dev_open; - dev->stop = ppp_dev_close; - dev->get_stats = ppp_get_stats; - dev->hard_header = ppp_header; - dev->type_trans = ppp_type_trans; - dev->rebuild_header = ppp_rebuild_header; - dev->hard_header_len = 0; - dev->addr_len = 0; - dev->type = ARPHRD_PPP; - -#ifdef NET02D - dev->add_arp = ppp_add_arp; - dev->queue_xmit = dev_queue_xmit; + /* 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 (indx = 0; indx < DEV_NUMBUFFS; indx++) + skb_queue_head_init (&dev->buffs[indx]); + + /* 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); + + return 0; +} + +/* + * Local procedure to initialize the ppp structure + */ + +static void +ppp_init_ctrl_blk (register struct ppp *ppp) +{ + ppp->magic = PPP_MAGIC; + ppp->toss = 0xE0; + ppp->escape = 0; + + ppp->flags = 0; + ppp->mtu = PPP_MTU; + ppp->mru = PPP_MRU; + + memset (ppp->xmit_async_map, 0, sizeof (ppp->xmit_async_map)); + ppp->xmit_async_map[0] = 0xffffffff; + ppp->xmit_async_map[3] = 0x60000000; + ppp->recv_async_map = 0x00000000; + + ppp->rbuf = NULL; + ppp->wbuf = NULL; + ppp->ubuf = NULL; + ppp->cbuf = NULL; + ppp->slcomp = NULL; + ppp->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 - for (i = 0; i < DEV_NUMBUFFS; i++) - skb_queue_head_init(&dev->buffs[i]); /* = NULL if NET02D */ + /* clear statistics */ + memset (&ppp->stats, '\0', sizeof (struct pppstat)); - /* 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); + /* Reset the demand dial information */ + ppp->ddinfo.ip_sjiffies = + ppp->ddinfo.ip_rjiffies = + ppp->ddinfo.nip_sjiffies = + ppp->ddinfo.nip_rjiffies = jiffies; - return 0; +#ifdef PPP_COMPRESS + ppp->sc_xc_state = + ppp->sc_rc_state = NULL; +#endif /* PPP_COMPRESS */ } -static void -ppp_init_ctrl_blk(struct ppp *ppp) +/* called at boot/load time for each ppp device defined in the kernel */ + +#ifndef MODULE +int +ppp_init (struct device *dev) { - ppp->magic = PPP_MAGIC; - ppp->sending = 0; - ppp->toss = 0xFE; - ppp->escape = 0; - - ppp->flags = 0; - ppp->mtu = PPP_MTU; - ppp->mru = PPP_MRU; - ppp->fcs = 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->slcomp = NULL; - ppp->rbuff = NULL; - ppp->xbuff = NULL; - ppp->cbuff = NULL; - - ppp->rhead = NULL; - ppp->rend = NULL; - ppp->rcount = 0; - ppp->xhead = NULL; - ppp->xtail = NULL; - - ppp->us_rbuff = NULL; - ppp->us_rbuff_end = NULL; - ppp->us_rbuff_head = NULL; - ppp->us_rbuff_tail = NULL; - ppp->read_wait = NULL; - ppp->write_wait = NULL; - ppp->us_rbuff_lock = 0; - ppp->inp_sig = 0; - ppp->inp_sig_pid = 0; - -#ifdef OPTIMIZE_FLAG_TIME /* ensure flag will always be sent first time */ - ppp->last_xmit = jiffies - OPTIMIZE_FLAG_TIME; + static int first_time = 1; + int answer = 0; + + if (first_time) { + first_time = 0; + answer = ppp_first_time(); + } +/* + * Un-register the devices defined at the start of the system. They will + * be added when they are needed again. The first device just gets us into + * this code to register the handlers. + */ +#if 1 + unregister_netdev (dev); #else - ppp->last_xmit = 0; + ppp_init_dev (dev); + ppp_init_ctrl_blk (dev2ppp (dev)); + dev2ppp (dev) -> inuse = 0; + dev2ppp (dev) -> dev = dev; #endif + return answer; +} +#endif + +/* + * Routine to allocate a buffer for later use by the driver. + */ + +static struct ppp_buffer * +ppp_alloc_buf (int size, int type) +{ + struct ppp_buffer *buf; + + buf = (struct ppp_buffer *) kmalloc (size + sizeof (struct ppp_buffer), + GFP_ATOMIC); + + 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); +} + +/* + * Routine to release the allocated buffer. + */ - /* clear statistics */ - memset (&ppp->stats, '\0', sizeof (struct ppp_stats)); +static void +ppp_free_buf (struct ppp_buffer *ptr) +{ + if (ptr != NULL) + kfree (ptr); +} + +/* + * Lock the indicated transmit buffer + */ - /* Reset the demand dial information */ - ppp->ddinfo.ip_sjiffies = - ppp->ddinfo.ip_rjiffies = - ppp->ddinfo.nip_sjiffies = - ppp->ddinfo.nip_rjiffies = jiffies; +extern inline int +lock_buffer (register struct ppp_buffer *buf) +{ + 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); } /* @@ -352,1647 +626,2814 @@ ppp_init_ctrl_blk(struct ppp *ppp) * 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. */ - -static void + +static int ppp_changedmtu (struct ppp *ppp, int new_mtu, int new_mru) { - struct device *dev; - unsigned char *new_rbuff, *new_xbuff, *new_cbuff; - unsigned char *old_rbuff, *old_xbuff, *old_cbuff; - int mtu, mru; + 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; + + int mtu, mru; /* * Allocate the buffer from the kernel for the data */ - dev = ppp->dev; - mru = new_mru; - mtu = new_mtu; - - /* RFC 1331, section 7.2 says the minimum value is 1500 bytes */ - if (mru < PPP_MRU) - mru = PPP_MRU; + dev = ppp2dev (ppp); + mru = new_mru; + /* allow for possible escapement of every character */ + mtu = (new_mtu * 2) + 20; - mtu = (mtu * 2) + 20; - mru = (mru * 2) + 20; + /* RFC 1331, section 7.2 says the minimum value is 1500 bytes */ + if (mru < PPP_MRU) + mru = PPP_MRU; - PRINTKN (2,(KERN_INFO "ppp: channel %s mtu = %d, mru = %d\n", - dev->name, new_mtu, new_mru)); + mru += 10; - new_xbuff = (unsigned char *) kmalloc(mtu + 4, GFP_KERNEL); - new_rbuff = (unsigned char *) kmalloc(mru + 4, GFP_KERNEL); - new_cbuff = (unsigned char *) kmalloc(mru + 4, GFP_KERNEL); + if (ppp->flags & SC_DEBUG) + printk (KERN_INFO "ppp: channel %s mtu = %d, mru = %d\n", + dev->name, new_mtu, new_mru); + + new_wbuf = ppp_alloc_buf (mtu+PPP_HARD_HDR_LEN, BUFFER_TYPE_DEV_WR); + new_tbuf = ppp_alloc_buf ((PPP_MTU * 2) + 24, BUFFER_TYPE_TTY_WR); + new_rbuf = ppp_alloc_buf (mru + 84, BUFFER_TYPE_DEV_RD); + new_cbuf = ppp_alloc_buf (mru+PPP_HARD_HDR_LEN, BUFFER_TYPE_VJ); /* - * If the buffers failed to allocate then complain. + * If the buffers failed to allocate then complain and release the partial + * allocations. */ - if (new_xbuff == NULL || new_rbuff == NULL || new_cbuff == NULL) - { - PRINTKN (2,(KERN_ERR "ppp: failed to allocate new buffers\n")); + if (new_wbuf == NULL || new_tbuf == NULL || + new_rbuf == NULL || new_cbuf == NULL) { + if (ppp->flags & SC_DEBUG) + printk (KERN_ERR + "ppp: failed to allocate new buffers\n"); + + ppp_free_buf (new_wbuf); + ppp_free_buf (new_tbuf); + ppp_free_buf (new_rbuf); + ppp_free_buf (new_cbuf); + return 0; + } /* - * Release new buffer pointers if the updates were not performed + * Update the pointers to the new buffer structures. */ - if (new_rbuff != NULL) - kfree (new_rbuff); - - if (new_xbuff != NULL) - kfree (new_xbuff); - - if (new_cbuff != NULL) - kfree (new_cbuff); - } + 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 pointers to the new buffer structures. + * Update the parameters for the new buffer sizes */ - else - { - cli(); - old_xbuff = ppp->xbuff; - old_rbuff = ppp->rbuff; - old_cbuff = ppp->cbuff; + ppp->toss = 0xE0; /* To ignore characters until new FLAG */ + ppp->escape = 0; /* No pending escape character */ - ppp->xbuff = new_xbuff; - ppp->rbuff = new_rbuff; - ppp->cbuff = new_cbuff; + dev->mtu = + ppp->mtu = new_mtu; + ppp->mru = new_mru; - dev->mem_start = (unsigned long) new_xbuff; - dev->mem_end = (unsigned long) (dev->mem_start + mtu); + ppp->s1buf = NULL; + ppp->s2buf = NULL; + ppp->xbuf = NULL; - dev->rmem_start = (unsigned long) new_rbuff; - ppp->rend = (unsigned char *) - dev->rmem_end = (unsigned long) (dev->rmem_start + mru); + ppp->tty->flags &= ~TTY_DO_WRITE_WAKEUP; + ppp->flags &= ~SC_XMIT_BUSY; - ppp->rhead = new_rbuff; + sti (); /* - * Update the parameters for the new buffer sizes + * Release old buffer pointers */ - ppp->toss = 0xFE; - ppp->escape = 0; - ppp->sending = 0; - ppp->rcount = 0; - - ppp->mru = new_mru; - - ppp->mtu = - dev->mtu = new_mtu; + ppp_free_buf (old_rbuf); + ppp_free_buf (old_wbuf); + ppp_free_buf (old_cbuf); + ppp_free_buf (old_tbuf); + return 1; +} - sti(); /* - * Release old buffer pointers + * CCP is down; free (de)compressor state if necessary. */ - if (old_rbuff != NULL) - kfree (old_rbuff); - if (old_xbuff != NULL) - kfree (old_xbuff); +#ifdef PPP_COMPRESS +static void +ppp_ccp_closed (struct ppp *ppp) +{ + if (ppp->sc_xc_state) { + (*ppp->sc_xcomp->comp_free) (ppp->sc_xc_state); + ppp->sc_xc_state = NULL; + } - if (old_cbuff != NULL) - kfree (old_cbuff); + if (ppp->sc_rc_state) { + (*ppp->sc_rcomp->decomp_free) (ppp->sc_rc_state); + ppp->sc_rc_state = NULL; } } +#endif /* PPP_COMPRESS */ -/* called when we abandon the PPP line discipline */ +/* + * Called to release all of the information in the current PPP structure. + * + * It is called when the ppp device goes down or if it is unable to go + * up. + */ static void -ppp_release(struct ppp *ppp) +ppp_release (struct ppp *ppp) { -#ifdef NEW_TTY_DRIVERS - if (ppp->tty != NULL && ppp->tty->disc_data == ppp) - ppp->tty->disc_data = NULL; /* Break the tty->ppp link */ -#endif + struct tty_struct *tty; + struct device *dev; - if (ppp->dev) { - ppp->dev->flags &= ~IFF_UP; /* down the device */ - ppp->dev->flags |= IFF_POINTOPOINT; - } + tty = ppp2tty (ppp); + dev = ppp2dev (ppp); - kfree (ppp->xbuff); - kfree (ppp->cbuff); - kfree (ppp->rbuff); - kfree (ppp->us_rbuff); +#ifdef PPP_COMPRESS + ppp_ccp_closed (ppp); + ppp->sc_xc_state = + ppp->sc_rc_state = NULL; +#endif /* PPP_COMPRESS */ - ppp->xbuff = - ppp->cbuff = - ppp->rbuff = - ppp->us_rbuff = NULL; + if (tty != NULL && tty->disc_data == ppp) + tty->disc_data = NULL; /* Break the tty->ppp link */ + + if (dev && dev->flags & IFF_UP) { + dev_close (dev); /* close the device properly */ + dev->flags = 0; /* prevent recursion */ + } - if (ppp->slcomp) { - slhc_free(ppp->slcomp); - ppp->slcomp = NULL; - } + ppp_free_buf (ppp->rbuf); + ppp_free_buf (ppp->wbuf); + ppp_free_buf (ppp->cbuf); + ppp_free_buf (ppp->ubuf); + ppp_free_buf (ppp->tbuf); + + ppp->rbuf = + ppp->wbuf = + ppp->cbuf = + ppp->tbuf = + ppp->xbuf = + ppp->s1buf = + ppp->s2buf = + ppp->ubuf = NULL; + + if (ppp->slcomp) { + slhc_free (ppp->slcomp); + ppp->slcomp = NULL; + } - ppp->inuse = 0; - ppp->tty = NULL; + ppp->inuse = 0; + ppp->tty = NULL; } +/* + * Device callback. + * + * Called when the PPP device goes down in response to an ifconfig request. + */ + static void -ppp_close(struct tty_struct *tty) +ppp_tty_close (struct tty_struct *tty) { - struct ppp *ppp = ppp_find(tty); + struct ppp *ppp = tty2ppp (tty); - if (ppp == NULL || ppp->magic != PPP_MAGIC) { - PRINTKN (1,(KERN_WARNING "ppp: trying to close unopened tty!\n")); - } else { - CHECK_PPP_VOID(); - ppp_release (ppp); - - PRINTKN (2,(KERN_INFO "ppp: channel %s closing.\n", ppp->dev->name)); - } + if (ppp == NULL || ppp->magic != PPP_MAGIC) { + if (ppp->flags & SC_DEBUG) + printk (KERN_WARNING + "ppp: trying to close unopened tty!\n"); + } else { + CHECK_PPP_VOID(); + if (ppp->flags & SC_DEBUG) + printk (KERN_INFO "ppp: channel %s closing.\n", + ppp2dev(ppp) -> name); + ppp_release (ppp); + MOD_DEC_USE_COUNT; + } } -/* called when PPP line discipline is selected on a tty */ -static int -ppp_open(struct tty_struct *tty) -{ - struct ppp *ppp = ppp_find(tty); - - if (ppp) { - PRINTKN (1,(KERN_ERR "ppp_open: gack! tty already associated to %s!\n", - ppp->magic == PPP_MAGIC ? ppp->dev->name : "unknown")); - return -EEXIST; - } - - ppp = ppp_alloc(); - if (ppp == NULL) { - PRINTKN (1,(KERN_ERR "ppp_open: couldn't allocate ppp channel\n")); - return -ENFILE; - } - - /* make sure the channel is actually open */ - ppp_init_ctrl_blk (ppp); - - ppp->tty = tty; - -#ifdef NEW_TTY_DRIVERS - tty->disc_data = ppp; - if (tty->driver.flush_buffer) - tty->driver.flush_buffer(tty); - if (tty->ldisc.flush_buffer) - tty->ldisc.flush_buffer(tty); -#else - tty_read_flush (tty); - tty_write_flush (tty); -#endif - - if ((ppp->slcomp = slhc_init(16, 16)) == NULL) { - PRINTKN (1,(KERN_ERR "ppp: no space for compression buffers!\n")); - ppp_release (ppp); - return -ENOMEM; - } - - /* Define the buffers for operation */ - ppp_changedmtu (ppp, ppp->dev->mtu, ppp->mru); - if (ppp->rbuff == NULL) { - ppp_release (ppp); - return -ENOMEM; - } - - /* Allocate a user-level receive buffer */ - ppp->us_rbuff = kmalloc (RBUFSIZE, GFP_KERNEL); - if (ppp->us_rbuff == NULL) { - PRINTKN (1,(KERN_ERR "ppp: no space for user receive buffer\n")); - ppp_release (ppp); - return -ENOMEM; - } - - ppp->us_rbuff_head = - ppp->us_rbuff_tail = ppp->us_rbuff; - ppp->us_rbuff_end = ppp->us_rbuff + RBUFSIZE; - - PRINTKN (2,(KERN_INFO "ppp: channel %s open\n", ppp->dev->name)); - -#ifdef NEW_TTY_DRIVERS - return (0); -#else - return (ppp->line); -#endif -} +/* + * TTY callback. + * + * Called when the tty discipline is switched to PPP. + */ -/* called when ppp interface goes "up". here this just means we start - passing IP packets */ static int -ppp_dev_open(struct device *dev) +ppp_tty_open (struct tty_struct *tty) { - struct ppp *ppp = &ppp_ctrl[dev->base_addr]; - - /* reset POINTOPOINT every time, since dev_close zaps it! */ - dev->flags |= IFF_POINTOPOINT; + struct ppp *ppp = tty2ppp (tty); +/* + * There should not be an existing table for this slot. + */ + if (ppp) { + if (ppp->flags & SC_DEBUG) + printk (KERN_ERR + "ppp_tty_open: gack! tty already associated to %s!\n", + ppp->magic == PPP_MAGIC ? ppp2dev(ppp)->name + : "unknown"); + return -EEXIST; + } +/* + * Allocate the structure from the system + */ + ppp = ppp_alloc (); + if (ppp == NULL) { + if (ppp->flags & SC_DEBUG) + printk (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 discipline. + */ + if (tty->ldisc.flush_buffer) + tty->ldisc.flush_buffer (tty); - if (ppp->tty == NULL) { - PRINTKN (1,(KERN_ERR "ppp: %s not connected to a TTY! can't go open!\n", - dev->name)); - return -ENXIO; - } + 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) { + if (ppp->flags & SC_DEBUG) + printk (KERN_ERR + "ppp_tty_open: no space for compression buffers!\n"); + ppp_release (ppp); + return -ENOMEM; + } +/* + * Allocate space for the MTU and MRU buffers + */ + if (ppp_changedmtu (ppp, ppp2dev(ppp)->mtu, ppp->mru) == 0) { + ppp_release (ppp); + return -ENOMEM; + } +/* + * Allocate space for a user level buffer + */ + ppp->ubuf = ppp_alloc_buf (RBUFSIZE, BUFFER_TYPE_TTY_RD); + if (ppp->ubuf == NULL) { + if (ppp->flags & SC_DEBUG) + printk (KERN_ERR + "ppp_tty_open: no space for user receive buffer\n"); + ppp_release (ppp); + return -ENOMEM; + } - PRINTKN (2,(KERN_INFO "ppp: channel %s going up for IP packets!\n", - dev->name)); + if (ppp->flags & SC_DEBUG) + printk (KERN_INFO "ppp: channel %s open\n", + ppp2dev(ppp)->name); - CHECK_PPP(-ENXIO); - return 0; + MOD_INC_USE_COUNT; + return (ppp->line); } -static int -ppp_dev_close(struct device *dev) +/* + * Local function to send the next portion of the buffer. + * + * Called by the tty driver's tty_wakeup function should it be entered + * because the partial buffer was transmitted. + * + * Called by kick_tty to send the initial portion of the buffer. + * + * Completion processing of the buffer transmission is handled here. + */ + +static void +ppp_tty_wakeup_code (struct ppp *ppp, struct tty_struct *tty, + struct ppp_buffer *xbuf) { - struct ppp *ppp = &ppp_ctrl[dev->base_addr]; - - if (ppp->tty == NULL) { - PRINTKN (1,(KERN_ERR "ppp: %s not connected to a TTY! can't go down!\n", - dev->name)); - return -ENXIO; - } - - PRINTKN (2,(KERN_INFO "ppp: channel %s going down for IP packets!\n", - dev->name)); - CHECK_PPP(-ENXIO); - return 0; + 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->stats.ppp_oerrors++; + actual = count; + } else + ppp->bytes_sent += actual; +/* + * If the buffer has been transmitted then clear the indicators. + */ + xbuf->tail += actual; + if (actual == count) { + xbuf = NULL; + ppp->flags &= ~SC_XMIT_BUSY; +/* + * Complete the transmission on the current buffer. + */ + xbuf = ppp->xbuf; + if (xbuf != NULL) { + tty->flags &= ~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 (ppp2dev (ppp) -> flags & IFF_UP) { + ppp2dev (ppp)->tbusy = 0; + mark_bh (NET_BH); + dev_tint (ppp2dev (ppp)); + } +/* + * 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); + } + } + } +/* + * Clear the re-entry flag + */ + ppp->flags &= ~SC_XMIT_BUSY; } -/************************************************************* - * TTY OUTPUT - * The following function delivers a fully-formed PPP - * frame in ppp->xbuff to the TTY for output. - *************************************************************/ +/* + * 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. + */ -#ifdef NEW_TTY_DRIVERS -static inline void -#else static void -#endif -ppp_output_done (void *ppp) +ppp_tty_wakeup (struct tty_struct *tty) { - /* unlock the transmitter queue */ - ppp_unlock ((struct ppp *) ppp); - - /* If the device is still up then enable the transmitter of the - next frame. */ - if (((struct ppp *) ppp)->dev->flags & IFF_UP) - dev_tint (((struct ppp *) ppp)->dev); + struct ppp_buffer *xbuf; + struct ppp *ppp = tty2ppp (tty); - /* enable any blocked process pending transmission */ - wake_up_interruptible (&((struct ppp *) ppp)->write_wait); + if (!ppp || ppp->magic != PPP_MAGIC) { + if (ppp->flags & SC_DEBUG) + printk (KERN_DEBUG "PPP: write_wakeup called but " + "couldn't find PPP struct.\n"); + return; + } +/* + * Ensure that there is a transmission pending. Clear the re-entry flag if + * there is no pending buffer. Otherwise, send the buffer. + */ + xbuf = ppp->xbuf; + if (xbuf == NULL) + tty->flags &= ~(1 << TTY_DO_WRITE_WAKEUP); + else + ppp_tty_wakeup_code (ppp, tty, xbuf); } -#ifndef NEW_TTY_DRIVERS +/* + * This function is called to transmit a buffer to the remote. The buffer + * is placed on the pending queue if there is presently a buffer being + * sent or it is transmitted with the aid of ppp_tty_wakeup. + */ + static void -ppp_kick_tty (struct ppp *ppp) +ppp_kick_tty (struct ppp *ppp, struct ppp_buffer *xbuf) { - register int count = ppp->xhead - ppp->xbuff; - register int answer; - - ppp->stats.sbytes += count; - - answer = tty_write_data (ppp->tty, - ppp->xbuff, - count, - ppp_output_done, - (void *) ppp); - - if (answer == 0) - ppp_output_done (ppp); /* Should not happen */ - else - if (answer < 0) { - ppp->stats.serrors++; - ppp_output_done (ppp); /* unlock the transmitter */ - } -} - -#else - -static void -ppp_kick_tty (struct ppp *ppp) -{ - register int count, actual; - - count = ppp->xhead - ppp->xbuff; - - actual = ppp->tty->driver.write(ppp->tty, 0, ppp->xbuff, count); - ppp->stats.sbytes += actual; - if (actual == count) { - ppp_output_done(ppp); - } else { - ppp->xtail = ppp->xbuff + actual; - ppp->tty->flags |= (1 << TTY_DO_WRITE_WAKEUP); + register int flags; +/* + * Hold interrupts. + */ + save_flags (flags); + cli (); +/* + * Control the flags which are best performed with the interrupts masked. + */ + xbuf->locked = 1; + xbuf->tail = 0; +/* + * If the transmitter is busy then place the buffer on the appropriate + * priority queue. + */ + if (ppp->xbuf != NULL) { + if (xbuf->type == BUFFER_TYPE_TTY_WR) + ppp->s1buf = xbuf; + else + ppp->s2buf = xbuf; + restore_flags (flags); + return; } +/* + * If the transmitter is not busy then this is the highest priority frame + */ + ppp->flags &= ~SC_XMIT_BUSY; + ppp->tty->flags |= (1 << TTY_DO_WRITE_WAKEUP); + ppp->xbuf = xbuf; + restore_flags (flags); +/* + * Do the "tty wakeup_code" to actually send this buffer. + */ + ppp_tty_wakeup_code (ppp, ppp2tty (ppp), xbuf); } -static void ppp_write_wakeup(struct tty_struct *tty) +/************************************************************* + * 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. + *************************************************************/ + +/* + * 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) { - register int count, actual; - struct ppp *ppp = ppp_find(tty); + return 65536; /* We can handle an infinite amount of data. :-) */ +} + +/* + * Callback function when data is available at the tty driver. + */ +static void +ppp_tty_receive (struct tty_struct *tty, u_char * data, char *flags, int count) +{ + register struct ppp *ppp = tty2ppp (tty); + register struct ppp_buffer *buf = ppp->rbuf; + u_char chr; +/* + * Verify the table pointer and ensure that the line is + * still in PPP discipline. + */ if (!ppp || ppp->magic != PPP_MAGIC) { - PRINTKN (1, - (KERN_ERR "PPP: write_wakeup called but couldn't " - "find PPP struct.\n")); + if (ppp->flags & SC_DEBUG) + printk (KERN_DEBUG + "PPP: handler called but couldn't find " + "PPP struct.\n"); return; } + CHECK_PPP_VOID (); +/* + * Print the buffer if desired + */ + if (ppp->flags & SC_LOG_RAWIN) + ppp_print_buffer ("receive buffer", data, count); +/* + * Collect the character and error condition for the character. Set the toss + * flag for the first character error. + */ + while (count-- > 0) { + ppp->bytes_rcvd++; + chr = *data++; + if (flags) { + if (*flags && ppp->toss == 0) + ppp->toss = *flags; + ++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. + */ - if (!ppp->xtail || (ppp->flags & SC_XMIT_BUSY)) - return; - - cli(); - if (ppp->flags & SC_XMIT_BUSY) - return; - ppp->flags |= SC_XMIT_BUSY; - sti(); - - count = ppp->xhead - ppp->xtail; - - actual = tty->driver.write(tty, 0, ppp->xtail, count); - ppp->stats.sbytes += actual; - if (actual == count) { - ppp->xtail = 0; - tty->flags &= ~TTY_DO_WRITE_WAKEUP; +#ifdef CHECK_CHARACTERS + if (chr & 0x80) + ppp->flags |= SC_RCV_B7_1; + else + ppp->flags |= SC_RCV_B7_0; + + if (paritytab[chr >> 5] & (1 << (chr & 0x1F))) + ppp->flags |= SC_RCV_ODDP; + else + ppp->flags |= SC_RCV_EVNP; +#endif +/* + * 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->stats.ppp_ibytes = ppp->bytes_rcvd; + if (ppp->escape) + ppp->toss |= 0x80; +/* + * Process frames which are not to be ignored. If the processing failed, + * then clean up the VJ tables. + */ + if ((ppp->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; + ppp->escape = 0; + ppp->toss = 0; + break; +/* + * All other characters in the data come here. If the character is in the + * receive 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->escape = 0; - ppp_output_done(ppp); - } else { - ppp->xtail += actual; + if (ppp->toss != 0) + break; +/* + * 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->stats.ppp_ierrors++; + ppp->toss |= 0xC0; + break; + } } - ppp->flags &= ~SC_XMIT_BUSY; } -#endif -/************************************************************* - * 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. - *************************************************************/ +/* + * Put the input frame into the networking system for the indicated protocol + */ + +static int +ppp_rcv_rx (struct ppp *ppp, unsigned short proto, u_char * data, int count) +{ + sk_buff *skb = alloc_skb (count, GFP_ATOMIC); +/* + * Generate a skb buffer for the new frame. + */ + if (skb == NULL) { + if (ppp->flags & SC_DEBUG) + printk (KERN_ERR + "ppp_do_ip: packet dropped on %s (no memory)!\n", + ppp2dev (ppp)->name); + return 0; + } +/* + * Move the received data from the input buffer to the skb buffer. + */ + skb->len = count; /* Store the length */ + skb->dev = ppp2dev (ppp); /* We are the device */ +#ifdef NEW_SKBUF + skb->protocol = proto; +#endif + memcpy ((u_char *) skb_data(skb), data, count); /* move data */ +/* + * Tag the frame and kick it to the proper receive routine + */ + skb->free = 1; + ppp->ddinfo.ip_rjiffies = jiffies; + netif_rx (skb); + return 1; +} -/* stuff a single character into the receive buffer */ +/* + * Process the receipt of an IP frame + */ -inline void -ppp_enqueue(struct ppp *ppp, unsigned char c) +static int +rcv_proto_ip (struct ppp *ppp, unsigned short proto, u_char * data, int count) { - unsigned long flags; - - save_flags(flags); - cli(); - if (ppp->rhead < ppp->rend) { - *ppp->rhead = c; - ppp->rhead++; - ppp->rcount++; - } else - ppp->stats.roverrun++; - restore_flags(flags); + if (ppp2dev (ppp)->flags & IFF_UP) { + if (count > 0) + return ppp_rcv_rx (ppp, htons (ETH_P_IP), data, count); + } + return 0; } -#ifdef CHECK_CHARACTERS -static unsigned paritytab[8] = { - 0x96696996, 0x69969669, 0x69969669, 0x96696996, - 0x69969669, 0x96696996, 0x96696996, 0x69969669 -}; +/* + * Process the receipt of an IPX frame + */ + +static int +rcv_proto_ipx (struct ppp *ppp, unsigned short proto, u_char * data, int count) +{ +#ifdef NEW_SKBUF + if (ppp2dev (ppp)->flags & IFF_UP) { + if (count > 0) + return ppp_rcv_rx (ppp, htons (ETH_P_IPX), data, count); + } else #endif + return 0; +} -#ifndef NEW_TTY_DRIVERS -static void -ppp_dump_inqueue(struct tty_struct *tty) +/* + * Process the receipt of an VJ Compressed frame + */ + +static int +rcv_proto_vjc_comp (struct ppp *ppp, unsigned short proto, + u_char *data, int count) { - int head = tty->read_q.head, - tail = tty->read_q.tail, - i, count; - char buffer[8]; - - PRINTK ((KERN_DEBUG "INQUEUE: head %d tail %d imode %x:\n", head, tail, - (unsigned int) tty->termios->c_iflag)) - - i = tail; - count = 0; - - while (i != head) { - buffer [count] = tty->read_q.buf[i]; - if (++count == 8) { - ppp_print_buffer (NULL, buffer, 8, KERNEL_DS); - count = 0; - } - i = (i + 1) & (TTY_BUF_SIZE - 1); - } - ppp_print_buffer (NULL, buffer, count, KERNEL_DS); + if ((ppp->flags & SC_REJ_COMP_TCP) == 0) { + int new_count = slhc_uncompress (ppp->slcomp, data, count); + if (new_count >= 0) { + return rcv_proto_ip (ppp, PPP_IP, data, new_count); + } + if (ppp->flags & SC_DEBUG) + printk (KERN_NOTICE + "ppp: error in VJ decompression\n"); + } + return 0; } -/* called by lower levels of TTY driver when data becomes available. - all incoming data comes through this function. */ +/* + * Process the receipt of an VJ Un-compressed frame + */ -void ppp_tty_input_ready(struct tty_struct *tty) +static int +rcv_proto_vjc_uncomp (struct ppp *ppp, unsigned short proto, + u_char *data, int count) { - struct ppp *ppp = ppp_find(tty); - int n, error; - unsigned char buff[128]; - -/* PRINTK( (KERN_DEBUG "PPP: handler called.\n") ) */ - if (!ppp || ppp->magic != PPP_MAGIC) { - PRINTKN (1, - (KERN_ERR "PPP: handler called but couldn't find PPP struct.\n")); - return; - } - - CHECK_PPP_VOID(); - - /* ZZZ */ - if (ppp_debug >= 5) - ppp_dump_inqueue(ppp->tty); - - do { - n = tty_read_raw_data(tty, buff, 128); - if ( n == 0 ) /* nothing there */ - break; - - if (ppp_debug >= 5) - ppp_print_buffer ("receive buffer", buff, n > 0 ? n : -n, KERNEL_DS); - - if ( n < 0 ) { - /* Last character is error flag. - Process the previous characters, then set toss flag. */ - n = (-n) - 1; - error = buff[n]; - } else error = 0; - ppp->stats.rbytes += n; - ppp_unesc(ppp,buff,n); - if (error) - ppp->toss = error; - } while (1); + if ((ppp->flags & SC_REJ_COMP_TCP) == 0) { + if (slhc_remember (ppp->slcomp, data, count) > 0) { + return rcv_proto_ip (ppp, PPP_IP, data, count); + } + if (ppp->flags & SC_DEBUG) + printk (KERN_NOTICE + "ppp: error in VJ memorizing\n"); + } + return 0; } -/* recover frame by undoing PPP escape mechanism; - copies N chars of input data from C into PPP->rbuff - calls ppp_doframe to dispose of any frames it finds -*/ +/* + * Receive all unclassified protocols. + */ -static void -ppp_unesc(struct ppp *ppp, unsigned char *c, int n) +static int +rcv_proto_unknown (struct ppp *ppp, unsigned short proto, + u_char *data, int len) { - int i; + int totlen; + register int current_idx; + +#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; \ +} - for (i = 0; i < n; i++, c++) { - PRINTKN (6,(KERN_DEBUG "(%x)", (unsigned int) *c)); +/* + * The total length includes the protocol data. + * Lock the user information buffer. + */ + if (set_bit (0, &ppp->ubuf->locked)) { + if (ppp->flags & SC_DEBUG) + printk (KERN_DEBUG + "ppp_us_queue: can't get lock\n"); + } else { + current_idx = ppp->ubuf->head; +/* + * Insert the buffer length (not counted), the protocol, and the data + */ + totlen = len + 2; + PUTC (totlen >> 8); + PUTC (totlen); + + PUTC (proto >> 8); + PUTC (proto); + + totlen -= 2; + while (totlen-- > 0) { + PUTC (*data++); + } +#undef PUTC +/* + * The frame is complete. Update the head pointer and wakeup the pppd + * process. + */ + ppp->ubuf->head = current_idx; -#ifdef CHECK_CHARACTERS - if (*c & 0x80) - sc->sc_flags |= SC_RCV_B7_1; - else - sc->sc_flags |= SC_RCV_B7_0; - - if (paritytab[*c >> 5] & (1 << (*c & 0x1F))) - sc->sc_flags |= SC_RCV_ODDP; - else - sc->sc_flags |= SC_RCV_EVNP; -#endif + clear_bit (0, &ppp->ubuf->locked); + wake_up_interruptible (&ppp->read_wait); + if (ppp->tty->fasync != NULL) + kill_fasync (ppp->tty->fasync, SIGIO); - switch (*c) { - case PPP_ESC: /* PPP_ESC: invert 0x20 in next character */ - ppp->escape = PPP_TRANS; - break; + if (ppp->flags & SC_DEBUG) + printk (KERN_INFO + "ppp: successfully queued %d bytes\n", + len + 2); - case PPP_FLAG: /* PPP_FLAG: end of frame */ - if (ppp->escape) /* PPP_ESC just before PPP_FLAG is illegal */ - ppp->toss = 0xFF; + ppp->ddinfo.nip_rjiffies = jiffies; + return 1; +/* + * The buffer is full. Unlock the header + */ +failure: + clear_bit (0, &ppp->ubuf->locked); + if (ppp->flags & SC_DEBUG) + printk (KERN_INFO + "ppp_us_queue: ran out of buffer space.\n"); + } +/* + * Discard the frame. There are no takers for this protocol. + */ + if (ppp->flags & SC_DEBUG) + printk (KERN_WARNING + "ppp: dropping packet on the floor.\n"); + slhc_toss (ppp->slcomp); + return 0; +} - if ((ppp->toss & 0x80) == 0) - ppp_doframe(ppp); /* pass frame on to next layers */ +/* + * 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->rcount = 0; - ppp->rhead = ppp->rbuff; - ppp->escape = 0; - ppp->toss = 0; - break; +#ifdef PPP_COMPRESS +static void ppp_proto_ccp (struct ppp *ppp, u_char *dp, int len, int rcvd) +{ + int slen = CCP_LENGTH(dp); - default: /* regular character */ - if (!in_rmap (ppp, *c)) { - if (ppp->toss == 0) - ppp_enqueue (ppp, *c ^ ppp->escape); - ppp->escape = 0; - } - break; - } - } + if (slen <= len) { + 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) { + ppp->flags &= ~(SC_CCP_UP | + SC_COMP_RUN | + SC_DECOMP_RUN); + } + break; + + case CCP_CONFACK: + if (ppp->flags & SC_CCP_OPEN == 0) + break; + if (ppp->flags & SC_CCP_UP) + break; + if (slen < CCP_HDRLEN + CCP_OPT_MINLEN) + break; + if (slen < CCP_OPT_LENGTH (dp + CCP_HDRLEN) + + CCP_HDRLEN) + break; +/* + * we're agreeing to send compressed packets. + */ + if (!rcvd) { + if (ppp->sc_xc_state == NULL) + break; + + if ((*ppp->sc_xcomp->comp_init) + (ppp->sc_xc_state, + dp + CCP_HDRLEN, + slen - CCP_HDRLEN, + ppp2dev (ppp)->base_addr, + ppp->flags & SC_DEBUG)) + ppp->flags |= SC_COMP_RUN; + break; + } +/* + * peer is agreeing to send compressed packets. + */ + if (ppp->sc_rc_state == NULL) + break; + + if ((*ppp->sc_rcomp->decomp_init) + (ppp->sc_rc_state, + dp + CCP_HDRLEN, + slen - CCP_HDRLEN, + ppp2dev (ppp)->base_addr, + ppp->mru, + ppp->flags & SC_DEBUG)) { + ppp->flags |= SC_DECOMP_RUN; + ppp->flags &= ~(SC_DC_ERROR | SC_DC_FERROR); + } + break; +/* + * The protocol sequence is complete at this end + */ + case CCP_RESETACK: + if (ppp->flags & SC_CCP_UP == 0) + break; + + if (!rcvd) { + if (ppp->sc_xc_state && + (ppp->flags & SC_COMP_RUN)) + (*ppp->sc_xcomp->comp_reset) + (ppp->sc_xc_state); + break; + } + + if (ppp->sc_rc_state && (ppp->flags & SC_DECOMP_RUN)) { + (*ppp->sc_rcomp->decomp_reset) + (ppp->sc_rc_state); + ppp->flags &= ~SC_DC_ERROR; + } + break; + } + } } -#else -static void ppp_receive_buf(struct tty_struct *tty, unsigned char *cp, - char *fp, int count) +static int +rcv_proto_ccp (struct ppp *ppp, unsigned short proto, u_char *dp, int len) { - register struct ppp *ppp = ppp_find (tty); - unsigned char c; - -/* PRINTK( ("PPP: handler called.\n") ); */ + ppp_proto_ccp (ppp, dp, len, 1); + return rcv_proto_unknown (ppp, proto, dp, len); +} +#endif /* PPP_COMPRESS */ - if (!ppp || ppp->magic != PPP_MAGIC) { - PRINTKN (1,("PPP: handler called but couldn't find " - "PPP struct.\n")); - return; - } +/* + * Handle a LQR packet. + * + * The LQR packet is passed along to the pppd process just like any + * other PPP frame. The difference is that some processing needs to be + * performed to append the current data to the end of the frame. + */ - CHECK_PPP_VOID(); - - if (ppp_debug >= 5) { - ppp_print_buffer ("receive buffer", cp, count, KERNEL_DS); - } - - while (count-- > 0) { - c = *cp++; +static int +rcv_proto_lqr (struct ppp *ppp, unsigned short proto, u_char * data, int len) +{ + register u_char *p; - if (fp) { - if (*fp && ppp->toss == 0) - ppp->toss = *fp; - fp++; - } + if (len > 8) { + if (len < 48) + memset (&data [len], '\0', 48 - len); +/* + * Fill in the fields from the driver data + */ + p = &data [48]; + p = store_long (p, ++ppp->stats.ppp_ilqrs); + p = store_long (p, ppp->stats.ppp_ipackets); + p = store_long (p, ppp->stats.ppp_discards); + p = store_long (p, ppp->stats.ppp_ierrors); + p = store_long (p, ppp->stats.ppp_ioctects + len); + + len = 68; + } +/* + * Pass the frame to the pppd daemon. + */ + return rcv_proto_unknown (ppp, proto, data, len); +} -#ifdef CHECK_CHARACTERS - if (c & 0x80) - sc->sc_flags |= SC_RCV_B7_1; - else - sc->sc_flags |= SC_RCV_B7_0; - - if (paritytab[c >> 5] & (1 << (c & 0x1F))) - sc->sc_flags |= SC_RCV_ODDP; - else - sc->sc_flags |= SC_RCV_EVNP; +/* on entry, a received frame is in ppp->rbuf.bufr + check it and dispose as appropriate */ + +static void ppp_doframe_lower (struct ppp *ppp, u_char *data, int len) +{ + u_short proto; + int count = len; + ppp_proto_type *proto_ptr; +/* + * Ignore empty frames + */ + if (count <= 0) + return; +/* + * Count the frame and print it + */ + ++ppp->stats.ppp_ipackets; + if (ppp->flags & SC_LOG_INPKT) + ppp_print_buffer ("receive frame", data, count); +/* + * Ignore the leading ADDRESS and CONTROL fields in the frame. + */ + if ((data[0] == PPP_ALLSTATIONS) && (data[1] == PPP_UI)) { + data += 2; + count -= 2; + } +/* + * Obtain the protocol from the frame + */ + proto = (u_short) *data++; + if (proto & 1) + count--; + else { + proto = (proto << 8) | (u_short) *data++; + count -= 2; + } +/* + * Find the procedure to handle this protocol. The last one is marked + * as a protocol 0 which is the 'catch-all' to feed it to the pppd daemon. + */ + proto_ptr = proto_list; + while (proto_ptr->proto != 0 && proto_ptr->proto != proto) + ++proto_ptr; +/* + * Update the appropriate statistic counter. + */ + if ((*proto_ptr->func) (ppp, proto, data, count)) + ppp->stats.ppp_ioctects += len; + else + ++ppp->stats.ppp_discards; +} + +/* on entry, a received frame is in ppp->rbuf.bufr + check it and dispose as appropriate */ + +static int +ppp_doframe (struct ppp *ppp) +{ + u_char *data = buf_base (ppp->rbuf); + int count = ppp->rbuf->count; +#ifdef PPP_COMPRESS + int proto; + int new_count; + u_char *new_data; #endif +/* + * If there is a pending error from the receiver then log it and discard + * the damaged frame. + */ + if (ppp->toss) { + if (ppp->flags & SC_DEBUG) + printk (KERN_WARNING + "ppp_toss: tossing frame, reason = %d\n", + ppp->toss); + ppp->stats.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; +/* + * Generate an error if the frame is too small. + */ + if (count < PPP_HARD_HDR_LEN) { + if (ppp->flags & SC_DEBUG) + printk (KERN_WARNING + "ppp: got runt ppp frame, %d chars\n", count); + slhc_toss (ppp->slcomp); + ppp->stats.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) { + if (ppp->flags & SC_DEBUG) + printk (KERN_WARNING + "ppp: frame with bad fcs, excess = %x\n", + ppp->rbuf->fcs ^ PPP_GOODFCS); + ppp->stats.ppp_ierrors++; + return 0; + } + count -= 2; /* ignore the fcs characters */ + +#ifdef PPP_COMPRESS + proto = PPP_PROTOCOL (data); +/* + * Process the active decompressor. + */ + if ((ppp->sc_rc_state != (void *) 0) && + ((ppp->flags & SC_DECOMP_RUN) == 0)) { +/* + * If the frame is compressed then decompress it. + */ + if (((ppp->flags & (SC_DC_FERROR | SC_DC_ERROR)) == 0) && + (proto == PPP_COMP)) { + new_data = kmalloc (ppp->mru + 4, GFP_ATOMIC); + if (new_data == NULL) { + if (ppp->flags & SC_DEBUG) + printk (KERN_ERR + "ppp_doframe: no memory\n"); + slhc_toss (ppp->slcomp); + (*ppp->sc_rcomp->incomp) (ppp->sc_rc_state, + data, + count); + return 1; + } +/* + * Decompress the frame + */ + new_count = bsd_decompress (ppp->sc_rc_state, + data, + count, + new_data, + ppp->mru + 4); + + switch (new_count) { + default: + ppp_doframe_lower (ppp, new_data, new_count); + kfree (new_data); + return 1; + + case DECOMP_OK: + break; + + case DECOMP_ERROR: + ppp->flags |= SC_DC_ERROR; + break; + + case DECOMP_FATALERROR: + ppp->flags |= SC_DC_FERROR; + break; + } +/* + * Log the error condition and discard the frame. + */ + if (ppp->flags & SC_DEBUG) + printk (KERN_ERR + "ppp_proto_comp: " + "decompress err %d\n", new_count); + kfree (new_data); + slhc_toss (ppp->slcomp); + return 1; + } +/* + * The frame is not special. Pass it through the decompressor without + * actually decompressing the data + */ + (*ppp->sc_rcomp->incomp) (ppp->sc_rc_state, + data, + count); + } +#endif +/* + * Process the uncompressed frame. + */ + ppp_doframe_lower (ppp, data, count); + return 1; +} + +/************************************************************* + * LINE DISCIPLINE SUPPORT + * The following functions form support user programs + * which read and write data on a TTY with the PPP line + * discipline. Reading is done from a circular queue, + * filled by the lower TTY levels. + *************************************************************/ - switch (c) { - case PPP_ESC: /* PPP_ESC: invert 0x20 in next character */ - ppp->escape = PPP_TRANS; - break; +/* read a PPP frame from the us_rbuff circular buffer, + waiting if necessary +*/ - case PPP_FLAG: /* PPP_FLAG: end of frame */ - if (ppp->escape) /* PPP_ESC just before PPP_FLAG is "cancel"*/ - ppp->toss = 0xFF; +static int +ppp_tty_read (struct tty_struct *tty, struct file *file, u_char * buf, + unsigned int nr) +{ + struct ppp *ppp = tty2ppp (tty); + u_char c; + int len, indx; + +#define GETC(c) \ +{ \ + c = buf_base (ppp->ubuf) [ppp->ubuf->tail++]; \ + ppp->ubuf->tail &= ppp->ubuf->size; \ +} - if ((ppp->toss & 0x80) == 0) - ppp_doframe(ppp); /* pass frame on to next layers */ +/* + * Validate the pointer to the PPP structure + */ + if (!ppp || ppp->magic != PPP_MAGIC) { + if (ppp->flags & SC_DEBUG) + printk (KERN_ERR + "ppp_tty_read: cannot find ppp channel\n"); + return -EIO; + } + CHECK_PPP (-ENXIO); - ppp->rcount = 0; - ppp->rhead = ppp->rbuff; - ppp->escape = 0; - ppp->toss = 0; - break; + if (ppp->flags & SC_DEBUG) + printk (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) { + if (ppp->flags & SC_DEBUG) + printk (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) { + if (ppp->flags & SC_DEBUG) + printk (KERN_DEBUG + "ppp_tty_read: no data " + "(EWOULDBLOCK)\n"); + return -EWOULDBLOCK; + } + current->timeout = 0; + + if (ppp->flags & SC_DEBUG) + printk (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; + if (ppp->flags & SC_DEBUG) + printk (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 */ + + if (ppp->flags & SC_DEBUG) + printk (KERN_DEBUG + "ppp: read of %u bytes too small for %d " + "frame\n", nr, len + 2); + ppp->ubuf->tail += len; + ppp->ubuf->tail &= ppp->ubuf->size; + clear_bit (0, &ppp->ubuf->locked); + ppp->stats.ppp_ierrors++; + return -EOVERFLOW; + } +/* + * 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++); - default: /* regular character */ - if (!in_rmap (ppp, c)) { - if (ppp->toss == 0) - ppp_enqueue (ppp, c ^ ppp->escape); - ppp->escape = 0; - } - } - } + 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. + */ + clear_bit (0, &ppp->ubuf->locked); + len += 2; /* Account for ADDRESS and CONTROL bytes */ + if (ppp->flags & SC_DEBUG) + printk (KERN_DEBUG + "ppp_tty_read: passing %d bytes up\n", len); + return len; + } +#undef GETC } -#endif -/* on entry, a received frame is in ppp->rbuff - check it and dispose as appropriate */ +/* 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 (ppp->flags & SC_DEBUG) { + 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); +} + +/* + * Procedure to encode the data with the proper escapement and send the + * data to the remote system. + */ + static void -ppp_doframe(struct ppp *ppp) +ppp_dev_xmit_lower (struct ppp *ppp, struct ppp_buffer *buf, + u_char *data, int count, int non_ip) +{ + unsigned short int write_fcs; +/* + * Insert the leading FLAG character + */ + buf->count = 0; + +#ifdef OPTIMIZE_FLAG_TIME + if (non_ip) + ins_char (buf, PPP_FLAG); + else { + if (jiffies - ppp->last_xmit > OPTIMIZE_FLAG_TIME) + ins_char (buf, PPP_FLAG); + } + ppp->last_xmit = jiffies; +#else + ins_char (buf, PPP_FLAG); +#endif + + buf->fcs = PPP_INITFCS; +/* + * Insert the data + */ + while (count-- > 0) + ppp_stuff_char (ppp, buf, *data++); +/* + * Add the trailing CRC and the final flag character + */ + write_fcs = buf->fcs ^ 0xFFFF; + ppp_stuff_char (ppp, buf, write_fcs); + ppp_stuff_char (ppp, buf, write_fcs >> 8); + + if (ppp->flags & SC_DEBUG) + printk (KERN_DEBUG "ppp_dev_xmit_lower: fcs is %hx\n", + write_fcs); +/* + * Add the trailing flag character + */ + ins_char (buf, PPP_FLAG); +/* + * Print the buffer + */ + if (ppp->flags & SC_LOG_FLUSH) + ppp_print_buffer ("ppp flush", buf_base (buf), + buf->count); + else { + if (ppp->flags & SC_DEBUG) + printk (KERN_DEBUG + "ppp_dev_xmit: writing %d chars\n", + buf->count); + } +/* + * Send the block to the tty driver. + */ + ppp->stats.ppp_obytes += buf->count; + ppp_kick_tty (ppp, buf); +} + +/* + * Send an frame to the remote with the proper bsd compression. + * + * Return 0 if frame was queued for transmission. + * 1 if frame must be re-queued for later driver support. + */ + +int +ppp_dev_xmit_frame (struct ppp *ppp, struct ppp_buffer *buf, + u_char *data, int count) { - u_char *c = ppp->rbuff; - u_short proto; - int count = ppp->rcount; - - /* forget it if we've already noticed an error */ - if (ppp->toss) { - PRINTKN (1, (KERN_WARNING "ppp_toss: tossing frame, reason = %d\n", - ppp->toss)); - ppp->stats.rerrors++; - return; - } - - /* do this before printing buffer to avoid generating copious output */ - if (count == 0) - return; - - if (ppp_debug >= 3) - ppp_print_buffer ("receive frame", c, count, KERNEL_DS); - - if (count < 4) { - PRINTKN (1,(KERN_WARNING "ppp: got runt ppp frame, %d chars\n", count)); - ppp->stats.runts++; - return; - } - - /* check PPP error detection field */ - if (!ppp_check_fcs(ppp)) { - PRINTKN (1,(KERN_WARNING "ppp: frame with bad fcs\n")); - ppp->stats.rerrors++; - return; - } - - count -= 2; /* ignore last two characters */ - - /* now we have a good frame */ - /* figure out the protocol field */ - if ((c[0] == PPP_ADDRESS) && (c[1] == PPP_CONTROL)) { - c = c + 2; /* ADDR/CTRL not compressed, so skip */ - count -= 2; - } - - proto = (u_short) *c++; /* PROTO compressed */ - if (proto & 1) { - count--; - } else { - proto = (proto << 8) | (u_short) *c++; /* PROTO uncompressed */ - count -= 2; - } - - /* Send the frame to the network if the ppp device is up */ - if ((ppp->dev->flags & IFF_UP) && ppp_do_ip(ppp, proto, c, count)) { - ppp->ddinfo.ip_rjiffies = jiffies; - return; - } - - /* If we got here, it has to go to a user process doing a read, - so queue it. - - User process expects to get whole frame (for some reason), so - use count+2 so as to include FCS field. */ - - if (ppp_us_queue (ppp, proto, c, count+2)) { - ppp->ddinfo.nip_rjiffies = jiffies; - ppp->stats.rothers++; - return; - } - - /* couldn't cope. */ - PRINTKN (1,(KERN_WARNING - "ppp: dropping packet on the floor: nobody could take it.\n")); - ppp->stats.tossed++; + int address, control; + int proto; + u_char *new_data; + int new_count; +/* + * Print the buffer + */ + if (ppp->flags & SC_LOG_OUTPKT) + ppp_print_buffer ("write frame", data, count); +/* + * Determine if the frame may be compressed. Attempt to compress the + * frame if possible. + */ + address = PPP_ADDRESS (data); + control = PPP_CONTROL (data); + proto = PPP_PROTOCOL (data); + +#ifdef PPP_COMPRESS + if ((ppp->flags & SC_COMP_RUN != 0) && + (ppp->sc_xc_state != (void *) 0) && + (address == PPP_ALLSTATIONS) && + (control == PPP_UI) && + (proto != PPP_LCP) && + (proto != PPP_CCP)) { + new_data = kmalloc (count, GFP_ATOMIC); + if (new_data == NULL) { + if (ppp->flags & SC_DEBUG) + printk (KERN_ERR + "ppp_dev_xmit_frame: no memory\n"); + return 1; + } + + new_count = bsd_compress (ppp->sc_xc_state, + data, + new_data, + count, + count); + + if (new_count > 0) { + ++ppp->stats.ppp_opackets; + ppp->stats.ppp_ooctects += count; + + ppp_dev_xmit_lower (ppp, buf, new_data, + new_count, 0); + kfree (new_data); + return 0; + } +/* + * The frame could not be compressed. + */ + kfree (new_data); + } +#endif +/* + * The frame may not be compressed. Update the statistics before the + * count field is destroyed. The frame will be transmitted. + */ + ++ppp->stats.ppp_opackets; + ppp->stats.ppp_ooctects += count; +/* + * Do not compress the protocol id if not possible + */ + if (!(ppp->flags & SC_COMP_PROT) || (proto & 0xFF00)) { + --data; + ++count; + } + + data += 3; + count -= 3; +/* + * Do not compress the address/control if not possible. + */ + if (address != PPP_ALLSTATIONS || + control != PPP_UI || + !(ppp->flags & SC_COMP_AC)) { + *--data = control; + *--data = address; + count += 2; + } +/* + * Go to the escape encoding + */ + ppp_dev_xmit_lower (ppp, buf, data, count, !!(proto & 0xFF00)); + return 0; } -/* 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. */ +/* + * Revise the tty frame for specific protocols. + */ static int -ppp_do_ip (struct ppp *ppp, unsigned short proto, unsigned char *c, - int count) +send_revise_frame (register struct ppp *ppp, u_char *data, int len) { - int flags, done; + u_char *p; - PRINTKN (4,(KERN_DEBUG "ppp_do_ip: proto %x len %d first byte %x\n", - (int) proto, count, c[0])); + switch (PPP_PROTOCOL (data)) { +/* + * Update the LQR frame with the current MIB information. This saves having + * the daemon read old MIB data from the driver. + */ + case PPP_LQR: + len = 48; /* total size of this frame */ + p = (u_char *) &data [40]; /* Point to last two items. */ + p = store_long (p, ppp->stats.ppp_opackets + 1); + p = store_long (p, ppp->stats.ppp_ooctects + len); + break; +/* + * Outbound compression frames + */ +#ifdef PPP_COMPRESS + case PPP_COMP: + ppp_proto_ccp (ppp, data, len, 0); + break; +#endif - if (ppp_debug_netpackets) { - PRINTK (("KERN_DEBUG %s <-- proto %x len %d\n", ppp->dev->name, - (int) proto, count)); - } - - if (proto == PROTO_IP) { - ppp->stats.runcomp++; - goto sendit; - } - - if ((proto == PROTO_VJCOMP) && !(ppp->flags & SC_REJ_COMP_TCP)) { - /* get space for uncompressing the header */ - done = 0; - save_flags (flags); - cli(); - if ((ppp->rhead + 80) < ppp->rend) { - ppp->rhead += 80; - ppp->rcount += 80; - done = 1; - } - restore_flags(flags); +/* + * All other frame types + */ + default: + break; + } - if (! done) { - PRINTKN (1,(KERN_NOTICE - "ppp: no space to decompress VJ compressed TCP header.\n")); - ppp->stats.roverrun++; - return 1; - } + return len; +} - count = slhc_uncompress(ppp->slcomp, c, count); - if (count <= 0) { - ppp->stats.rerrors++; - PRINTKN (1,(KERN_NOTICE "ppp: error in VJ decompression\n")); - return 1; - } - ppp->stats.rcomp++; - goto sendit; - } - - if ((proto == PROTO_VJUNCOMP) && !(ppp->flags & SC_REJ_COMP_TCP)) { - if (slhc_remember(ppp->slcomp, c, count) <= 0) { - ppp->stats.rerrors++; - PRINTKN (1,(KERN_NOTICE "ppp: error in VJ memorizing\n")); - return 1; - } - ppp->stats.runcomp++; - goto sendit; - } +/* + * write a frame with NR chars from BUF to TTY + * we have to put the FCS field on ourselves + */ - /* not ours */ - return 0; +static int +ppp_tty_write (struct tty_struct *tty, struct file *file, u_char * data, + unsigned int count) +{ + struct ppp *ppp = tty2ppp (tty); + u_char *new_data; +/* + * Verify the pointer to the PPP data and that the tty is still in PPP mode. + */ + if (!ppp || ppp->magic != PPP_MAGIC) { + if (ppp->flags & SC_DEBUG) + printk (KERN_ERR + "ppp_tty_write: cannot find ppp unit\n"); + return -EIO; + } - sendit: - if (ppp_debug_netpackets) { - struct iphdr *iph = (struct iphdr *) c; - PRINTK ((KERN_INFO "%s <-- src %lx dst %lx len %d\n", ppp->dev->name, - iph->saddr, iph->daddr, count)) - } + CHECK_PPP (-ENXIO); +/* + * Ensure that the caller does not wish to send too much. + */ + if (count > PPP_MTU) { + if (ppp->flags & SC_DEBUG) + printk (KERN_WARNING + "ppp_tty_write: truncating user packet " + "from %u to mtu %d\n", count, PPP_MTU); + count = PPP_MTU; + } +/* + * lock this PPP unit so we will be the only writer; + * sleep if necessary + */ + while (lock_buffer (ppp->tbuf) != 0) { + current->timeout = 0; + if (ppp->flags & SC_DEBUG) + printk (KERN_DEBUG "ppp_tty_write: sleeping\n"); + interruptible_sleep_on (&ppp->write_wait); + if (current->signal & ~current->blocked) + return -EINTR; + } +/* + * Allocate a buffer for the data and fetch it from the user space. + */ + new_data = kmalloc (count, GFP_ATOMIC); + if (new_data == NULL) { + if (ppp->flags & SC_DEBUG) + printk (KERN_ERR + "ppp_tty_write: no memory\n"); + ppp->tbuf->locked = 0; + return 0; + } - /* receive the frame through the network software */ - while ((dev_rint(c, count, 0, ppp->dev) & ~1) != 0) - ; + memcpy_fromfs (new_data, data, count); +/* + * Change the LQR frame + */ + count = send_revise_frame (ppp, new_data, count); +/* + * Send the data + */ + ppp_dev_xmit_frame (ppp, ppp->tbuf, new_data, count); + kfree (new_data); + return (int) count; +} + +/* + * Process the BSD compression IOCTL event for the tty device. + */ + +#ifdef PPP_COMPRESS +static int +ppp_set_compression (struct ppp *ppp, struct ppp_option_data *odp) +{ + int error; + int nb; + u_char ccp_option[CCP_MAX_OPTION_LENGTH]; + struct compressor **cp; +/* + * Validate the range of the ioctl + */ + error = verify_area (VERIFY_READ, odp, + (unsigned long) (&((struct ppp_option_data *) 0)->length) + + sizeof (odp->length)); - return 1; + if (error == 0) { + nb = (int) get_fs_long (odp->length); + if ((unsigned long) nb-1 >= (unsigned long) CCP_MAX_OPTION_LENGTH) + nb = CCP_MAX_OPTION_LENGTH; + + error = verify_area (VERIFY_READ, odp, nb); + } + + if (error != 0) + return error; + + memcpy_fromfs (ccp_option, odp, nb); + if (ccp_option[1] < 2) /* preliminary check on the length byte */ + return (-EINVAL); + + for (cp = ppp_compressors; *cp != NULL; ++cp) + if ((*cp)->compress_proto == ccp_option[0]) { + /* + * Found a handler for the protocol - try to allocate + * a compressor or decompressor. + */ + error = 0; + if (odp->transmit) { + if (ppp->sc_xc_state != NULL) + (*ppp->sc_xcomp->comp_free)(ppp->sc_xc_state); + + 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("ppp%ld: comp_alloc failed\n", + ppp2dev (ppp)->base_addr); + error = -ENOBUFS; + } + ppp->flags &= ~SC_COMP_RUN; + } else { + if (ppp->sc_rc_state != NULL) + (*ppp->sc_rcomp->decomp_free)(ppp->sc_rc_state); + 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("ppp%ld: decomp_alloc failed\n", + ppp2dev (ppp)->base_addr); + error = ENOBUFS; + } + ppp->flags &= ~SC_DECOMP_RUN; + } + return (error); + } + + if (ppp->flags & SC_DEBUG) + printk (KERN_DEBUG "ppp%ld: no compressor for [%x %x %x], %x\n", + ppp2dev (ppp)->base_addr, ccp_option[0], ccp_option[1], + ccp_option[2], nb); + return (-EINVAL); /* no handler found */ } +#endif /* PPP_COMPRESS */ -/* stuff packet at BUF, length LEN, into the us_rbuff buffer - prepend PROTO information */ +/* + * Process the IOCTL event for the tty device. + */ -#define PUTC(c,label) *ppp->us_rbuff_head++ = c; \ - if (ppp->us_rbuff_head == ppp->us_rbuff_end) \ - ppp->us_rbuff_head = ppp->us_rbuff; \ - if (ppp->us_rbuff_head == ppp->us_rbuff_tail) \ - goto label; -#define GETC(c) c = *ppp->us_rbuff_tail++; \ - if (ppp->us_rbuff_tail == ppp->us_rbuff_end) \ - ppp->us_rbuff_tail = ppp->us_rbuff; +static int +ppp_tty_ioctl (struct tty_struct *tty, struct file *file, unsigned int param2, + unsigned long param3) +{ + struct ppp *ppp = tty2ppp (tty); + register int temp_i = 0; + int error; +/* + * Verify the status of the PPP device. + */ + if (!ppp || ppp->magic != PPP_MAGIC) { + if (ppp->flags & SC_DEBUG) + 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) { + temp_i = (int) get_fs_long (param3); + if (ppp->flags & SC_DEBUG) + printk (KERN_INFO + "ppp_tty_ioctl: set mru to %x\n", temp_i); + + if (ppp->mru != temp_i) + ppp_changedmtu (ppp, ppp2dev (ppp)->mtu, temp_i); + } + 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; +#endif + put_fs_long ((long) temp_i, param3); + if (ppp->flags & SC_DEBUG) + printk (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) & SC_MASK; + temp_i |= (ppp->flags & ~SC_MASK); +#ifdef PPP_COMPRESS + if ((ppp->flags & SC_CCP_OPEN) && + (temp_i & SC_CCP_OPEN) == 0) + ppp_ccp_closed (ppp); +#else + temp_i &= ~SC_CCP_OPEN; +#endif + if ((ppp->flags | temp_i) & SC_DEBUG) + printk (KERN_INFO + "ppp_tty_ioctl: set flags to %x\n", temp_i); + ppp->flags = temp_i; + } + break; +/* + * Set the compression mode + */ +#ifdef PPP_COMPRESS + case PPPIOCSCOMPRESS: + error = ppp_set_compression (ppp, + (struct ppp_option_data *) param3); + break; +#endif +/* + * 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); + if (ppp->flags & SC_DEBUG) + printk (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); + if (ppp->flags & SC_DEBUG) + printk (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); + if (ppp->flags & SC_DEBUG) + printk (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 (ppp2dev (ppp)->base_addr, param3); + if (ppp->flags & SC_DEBUG) + printk (KERN_INFO + "ppp_tty_ioctl: get unit: %ld", + ppp2dev (ppp)->base_addr); + } + break; +/* + * Set the debug level + */ + case PPPIOCSDEBUG: + error = verify_area (VERIFY_READ, (void *) param3, + sizeof (temp_i)); + if (error == 0) { + temp_i = (int) (get_fs_long (param3) & 0x1F) << 16; + temp_i |= (ppp->flags & ~0x1F0000); + + if ((ppp->flags | temp_i) & SC_DEBUG) + printk (KERN_INFO + "ppp_tty_ioctl: set flags to %x\n", temp_i); + ppp->flags = temp_i; + } + break; +/* + * Get the debug level + */ + case PPPIOCGDEBUG: + error = verify_area (VERIFY_WRITE, (void *) param3, + sizeof (temp_i)); + if (error == 0) { + temp_i = (ppp->flags >> 16) & 0x1F; + put_fs_long ((long) temp_i, param3); + + if (ppp->flags & SC_DEBUG) + printk (KERN_INFO + "ppp_tty_ioctl: get debug level %d\n", + temp_i); + } + 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)); + if (ppp->flags & SC_DEBUG) + printk (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)); + + if (ppp->flags & SC_DEBUG) + printk (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)); + + if (ppp->flags & SC_DEBUG) + printk (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; + if (ppp->flags & SC_DEBUG) + printk (KERN_INFO + "ppp_tty_ioctl: set maxcid to %d\n", + temp_i); + if (ppp->slcomp != NULL) + slhc_free (ppp->slcomp); + ppp->slcomp = slhc_init (16, temp_i); + + if (ppp->slcomp == NULL) { + if (ppp->flags & SC_DEBUG) + printk (KERN_ERR + "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: + if (ppp->flags & SC_DEBUG) + printk (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_us_queue(struct ppp *ppp, unsigned short proto, - unsigned char *buf, int len) +ppp_tty_select (struct tty_struct *tty, struct inode *inode, + struct file *filp, int sel_type, select_table * wait) { - int totlen; - unsigned char *saved_head; + struct ppp *ppp = tty2ppp (tty); + int result = 1; +/* + * Verify the status of the PPP device. + */ + if (!ppp || ppp->magic != PPP_MAGIC) { + if (ppp->flags & SC_DEBUG) + 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; + } + return result; +} + +/************************************************************* + * 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...). + *************************************************************/ + +/* + * Callback from the network layer when the device goes up. + */ - totlen = len+2; /* including protocol */ +static int +ppp_dev_open (struct device *dev) +{ + struct ppp *ppp = dev2ppp (dev); - if (set_bit(1, &ppp->us_rbuff_lock)) { - PRINTKN (1, (KERN_NOTICE "ppp_us_queue: can't get lock\n")); - return 0; - } - saved_head = ppp->us_rbuff_head; + /* reset POINTOPOINT every time, since dev_close zaps it! */ + dev->flags |= IFF_POINTOPOINT; - PUTC((totlen & 0xff00) >> 8, failure); - PUTC(totlen & 0x00ff, failure); - PUTC((proto & 0xff00) >> 8, failure); - PUTC(proto & 0x00ff, failure); + if (ppp2tty (ppp) == NULL) { + if (ppp->flags & SC_DEBUG) + printk (KERN_ERR + "ppp: %s not connected to a TTY! can't go open!\n", + dev->name); + return -ENXIO; + } - while (len-- > 0) { - PUTC(*buf++, failure); - } + if (ppp->flags & SC_DEBUG) + printk (KERN_INFO + "ppp: channel %s going up for IP packets!\n", + dev->name); - PRINTKN (3, (KERN_INFO "ppp: successfully queued %d bytes\n", totlen)); - clear_bit(1, &ppp->us_rbuff_lock); - wake_up_interruptible (&ppp->read_wait); + CHECK_PPP (-ENXIO); + return 0; +} -#ifdef NEW_TTY_DRIVERS - kill_fasync(ppp->tty->fasync, SIGIO); -#endif +/* + * Callback from the network layer when the ppp device goes down. + */ - if (ppp->inp_sig && ppp->inp_sig_pid) - if (kill_proc (ppp->inp_sig_pid, ppp->inp_sig, 1) != 0) { - /* process is gone */ - PRINTKN (2,(KERN_NOTICE - "ppp: process that requested notification is gone\n")); - ppp->inp_sig = 0; - ppp->inp_sig_pid = 0; - } - return 1; +static int +ppp_dev_close (struct device *dev) +{ + struct ppp *ppp = dev2ppp (dev); + + if (ppp2tty (ppp) == NULL) { + if (ppp->flags & SC_DEBUG) + printk (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. + */ + if (ppp->flags & SC_DEBUG) + printk (KERN_INFO + "ppp: channel %s going down for IP packets!\n", + dev->name); + CHECK_PPP (-ENXIO); + return 0; +} - failure: - ppp->us_rbuff_head = saved_head; - clear_bit(1, &ppp->us_rbuff_lock); +/* + * IOCTL operation to read the version of the driver. + */ - PRINTKN (1, (KERN_NOTICE "ppp_us_queue: ran out of buffer space.\n")); +static int +ppp_dev_ioctl_version (struct ppp *ppp, struct ifreq *ifr) +{ + 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 0; + return error; } -/************************************************************* - * LINE DISCIPLINE SUPPORT - * The following functions form support user programs - * which read and write data on a TTY with the PPP line - * discipline. Reading is done from a circular queue, - * filled by the lower TTY levels. - *************************************************************/ - -/* read a PPP frame from the us_rbuff circular buffer, - waiting if necessary -*/ +/* + * IOCTL to read the statistics for the pppstats program. + */ static int -ppp_read(struct tty_struct *tty, struct file *file, unsigned char *buf, unsigned int nr) +ppp_dev_ioctl_stats (struct ppp *ppp, struct ifreq *ifr) { - struct ppp *ppp = ppp_find(tty); - unsigned char c; - int len, i; - - if (!ppp || ppp->magic != PPP_MAGIC) { - PRINTKN (1,(KERN_ERR "ppp_read: cannnot find ppp channel\n")); - return -EIO; - } - - CHECK_PPP(-ENXIO); - - PRINTKN (4,(KERN_DEBUG "ppp_read: called %x num %u\n", - (unsigned int) buf, - nr)); - - do { - /* try to acquire read lock */ - if (set_bit(0, &ppp->us_rbuff_lock) == 0) { - /* got lock */ - if (ppp->us_rbuff_head == ppp->us_rbuff_tail) { - /* no data */ - PRINTKN (4,(KERN_DEBUG "ppp_read: no data\n")); - clear_bit(0, &ppp->us_rbuff_lock); - if (ppp->inp_sig) { - PRINTKN (4,(KERN_DEBUG "ppp_read: EWOULDBLOCK\n")); - return -EWOULDBLOCK; - } else goto wait; - } - - /* reset the time of the last read operation */ - ppp->ddinfo.nip_rjiffies = jiffies; - - GETC (c); len = c << 8; GETC (c); len += c; - - PRINTKN (4,(KERN_DEBUG "ppp_read: len = %d\n", len)); - - if (len + 2 > nr) { - /* frame too big; can't copy it, but do update us_rbuff_head */ - PRINTKN (1,(KERN_DEBUG - "ppp: read of %u bytes too small for %d frame\n", - nr, len+2)); - ppp->us_rbuff_head += len; - if (ppp->us_rbuff_head > ppp->us_rbuff_end) - ppp->us_rbuff_head += - (ppp->us_rbuff_end - ppp->us_rbuff); - clear_bit(0, &ppp->us_rbuff_lock); - wake_up_interruptible (&ppp->read_wait); - ppp->stats.rgiants++; - return -EOVERFLOW; /* ZZZ; HACK! */ - } else { - /* have the space: copy the packet, faking the first two bytes */ - put_fs_byte (PPP_ADDRESS, buf++); - put_fs_byte (PPP_CONTROL, buf++); - i = len; - while (i-- > 0) { - GETC (c); - put_fs_byte (c, buf++); - } - } - - clear_bit(0, &ppp->us_rbuff_lock); - PRINTKN (3,(KERN_DEBUG "ppp_read: passing %d bytes up\n", len + 2)); - ppp->stats.rothers++; - return len + 2; - } + 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->stats, 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); - /* need to wait */ - wait: - current->timeout = 0; - PRINTKN (3,(KERN_DEBUG "ppp_read: sleeping\n")); - interruptible_sleep_on (&ppp->read_wait); - if (current->signal & ~current->blocked) - return -EINTR; - } while (1); -} + if (ppp->sc_rc_state != NULL) + (*ppp->sc_rcomp->decomp_stat) (ppp->sc_rc_state, + &temp.d); +#endif /* PPP_COMPRESS */ -/* stuff a character into the transmit buffer, using PPP's way of escaping - special characters. - also, update ppp->fcs to take account of new character */ -static inline void -ppp_stuff_char(struct ppp *ppp, unsigned char c) -{ - int curpt = ppp->xhead - ppp->xbuff; - if ((curpt < 0) || (curpt > 3000)) { - PRINTK ((KERN_DEBUG "ppp_stuff_char: %x %x %d\n", - (unsigned int) ppp->xbuff, (unsigned int) ppp->xhead, curpt)) - } - if (in_xmap (ppp, c)) { - *ppp->xhead++ = PPP_ESC; - *ppp->xhead++ = c ^ PPP_TRANS; - } else - *ppp->xhead++ = c; - ppp->fcs = (ppp->fcs >> 8) ^ fcstab[(ppp->fcs ^ c) & 0xff]; +/* + * Move the data to the caller's buffer + */ + memcpy_tofs (result, &temp, sizeof (temp)); + } + return error; } -/* write a frame with NR chars from BUF to TTY - we have to put the FCS field on ourselves -*/ +/* + * Callback from the network layer to process the sockioctl functions. + */ static int -ppp_write(struct tty_struct *tty, struct file *file, unsigned char *buf, unsigned int nr) +ppp_dev_ioctl (struct device *dev, struct ifreq *ifr, int cmd) { - struct ppp *ppp = ppp_find(tty); - int i; + struct ppp *ppp = dev2ppp (dev); + int error; +/* + * Process the requests + */ + switch (cmd) { + case SIOCGPPPSTATS: + error = ppp_dev_ioctl_stats (ppp, ifr); + break; + + case SIOCGPPPVER: + error = ppp_dev_ioctl_version (ppp, ifr); + break; + + default: + error = -EINVAL; + break; + } + return error; +} - if (!ppp || ppp->magic != PPP_MAGIC) { - PRINTKN (1,(KERN_ERR "ppp_write: cannot find ppp unit\n")); - return -EIO; - } +/* + * Send an IP frame to the remote with vj header compression. + * + * Return 0 if frame was queued for transmission. + * 1 if frame must be re-queued for later driver support. + */ - CHECK_PPP(-ENXIO); - - if (ppp->mtu != ppp->dev->mtu) /* Someone has been ifconfigging */ - ppp_changedmtu (ppp, ppp->dev->mtu, ppp->mru); - - if (nr > ppp->mtu) { - PRINTKN (1,(KERN_WARNING - "ppp_write: truncating user packet from %u to mtu %d\n", - nr, ppp->mtu)); - nr = ppp->mtu; - } - - if (ppp_debug >= 3) - ppp_print_buffer ("write frame", buf, nr, USER_DS); - - /* lock this PPP unit so we will be the only writer; - sleep if necessary */ - while ((ppp->sending == 1) || !ppp_lock(ppp)) { - current->timeout = 0; - PRINTKN (3,(KERN_DEBUG "ppp_write: sleeping\n")); - interruptible_sleep_on(&ppp->write_wait); - if (current->signal & ~current->blocked) - return -EINTR; - } - - /* OK, locked. Stuff the given bytes into the buffer. */ - - PRINTKN(4,(KERN_DEBUG "ppp_write: acquired write lock\n")); - ppp->xhead = ppp->xbuff; +int +ppp_dev_xmit_ip1 (struct device *dev, struct ppp *ppp, u_char *data) +{ + int proto = PPP_IP; + int len; + struct ppp_hdr *hdr; + struct tty_struct *tty = ppp2tty (ppp); +/* + * Obtain the length from the IP header. + */ + len = ((struct iphdr *)data) -> tot_len; + len = ntohs (len); +/* + * Validate the tty interface + */ + if (tty == NULL) { + if (ppp->flags & SC_DEBUG) + printk (KERN_ERR + "ppp_dev_xmit: %s not connected to a TTY!\n", + dev->name); + return 0; + } +/* + * Ensure that the PPP device is still up + */ + if (!(dev->flags & IFF_UP)) { + if (ppp->flags & SC_DEBUG) + printk (KERN_WARNING + "ppp_dev_xmit: packet sent on interface %s," + " which is down for IP\n", + dev->name); + return 0; + } +/* + * Detect a change in the transfer size + */ + if (ppp->mtu != ppp2dev (ppp)->mtu) { + ppp_changedmtu (ppp, + ppp2dev (ppp)->mtu, + ppp->mru); + } +/* + * Acquire the lock on the transmission buffer. If the buffer was busy then + * mark the device as busy and return "failure to send, try back later" error. + */ + if (lock_buffer (ppp->wbuf) != 0) { + dev->tbusy = 1; + return 1; + } +/* + * Print the frame being sent + */ + if (ppp->flags & SC_LOG_OUTPKT) + ppp_print_buffer ("ppp outpkt", data, len); +/* + * At this point, the buffer will be transmitted. There is no other exit. + * + * Try to compress the header. + */ + if (ppp->flags & SC_COMP_TCP) { + len = slhc_compress (ppp->slcomp, data, len, + buf_base (ppp->cbuf) + PPP_HARD_HDR_LEN, + &data, + !(ppp->flags & SC_NO_TCP_CCID)); + + if (data[0] & SL_TYPE_COMPRESSED_TCP) { + proto = PPP_VJC_COMP; + data[0] ^= SL_TYPE_COMPRESSED_TCP; + } else { + if (data[0] >= SL_TYPE_UNCOMPRESSED_TCP) + proto = PPP_VJC_UNCOMP; + data[0] = (data[0] & 0x0f) | 0x40; + } + } +/* + * Send the frame + */ + len += PPP_HARD_HDR_LEN; + hdr = &((struct ppp_hdr *) data)[-1]; -#ifdef OPTIMIZE_FLAG_TIME - if (jiffies - ppp->last_xmit > OPTIMIZE_FLAG_TIME) - *ppp->xhead++ = PPP_FLAG; - ppp->last_xmit = jiffies; -#else - *ppp->xhead++ = PPP_FLAG; -#endif + hdr->address = PPP_ALLSTATIONS; + hdr->control = PPP_UI; + hdr->protocol[0] = 0; + hdr->protocol[1] = proto; - ppp->fcs = PPP_FCS_INIT; - i = nr; - while (i-- > 0) - ppp_stuff_char(ppp,get_fs_byte(buf++)); + return ppp_dev_xmit_frame (ppp, ppp->wbuf, (u_char *) hdr, len); +} - ppp_add_fcs(ppp); /* concatenate FCS at end */ +/* + * This is just an interum solution until the 1.3 kernel's networking is + * available. The 1.2 kernel has problems with device headers before the + * buffers. + * + * This routine should be deleted, and the ppp_dev_xmit_ip1 routine called + * by this name. + */ - *ppp->xhead++ = PPP_FLAG; - - /* reset the time of the last write operation */ - ppp->ddinfo.nip_sjiffies = jiffies; +int +ppp_dev_xmit_ip (struct device *dev, struct ppp *ppp, u_char *data) +{ + struct ppp_hdr *hdr; + int len; + int answer; + + len = ((struct iphdr *)data) -> tot_len; + len = ntohs (len); + + hdr = (struct ppp_hdr *) kmalloc (len + sizeof (struct ppp_hdr), + GFP_ATOMIC); + + if (hdr == NULL) + answer = 1; + else { + memcpy (&hdr[1], data, len); + answer = ppp_dev_xmit_ip1 (dev, ppp, (u_char *) &hdr[1]); + kfree (hdr); + } - if (ppp_debug >= 6) - ppp_print_buffer ("xmit buffer", ppp->xbuff, ppp->xhead - ppp->xbuff, KERNEL_DS); - else { - PRINTKN (4,(KERN_DEBUG - "ppp_write: writing %d chars\n", ppp->xhead - ppp->xbuff)); - } + return answer; +} - /* packet is ready-to-go */ - ++ppp->stats.sothers; - ppp_kick_tty(ppp); +/* + * Send an IPX (or any other non-IP) frame to the remote. + * + * Return 0 if frame was queued for transmission. + * 1 if frame must be re-queued for later driver support. + */ - return((int)nr); -} - -static int -ppp_ioctl(struct tty_struct *tty, struct file *file, unsigned int i, - unsigned long l) +int +ppp_dev_xmit_ipx1 (struct device *dev, struct ppp *ppp, + u_char *data, int len, int proto) { - struct ppp *ppp = ppp_find(tty); - register int temp_i = 0; - int error; - - if (!ppp || ppp->magic != PPP_MAGIC) { - PRINTK ((KERN_ERR "ppp_ioctl: can't find PPP block from tty!\n")) - return -EBADF; - } - - CHECK_PPP(-ENXIO); - - /* This must be root user */ - if (!suser()) - return -EPERM; - - switch (i) { - case PPPIOCSMRU: - error = verify_area (VERIFY_READ, (void *) l, sizeof (temp_i)); - if (error == 0) { - PRINTKN (3,(KERN_INFO "ppp_ioctl: set mru to %x\n", temp_i)); - temp_i = (int) get_fs_long (l); - if (ppp->mru != temp_i) - ppp_changedmtu (ppp, ppp->mtu, temp_i); - } - break; - - case PPPIOCGFLAGS: - error = verify_area (VERIFY_WRITE, (void *) l, 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; -#endif - put_fs_long ((long) temp_i, l); - PRINTKN (3,(KERN_DEBUG "ppp_ioctl: get flags: addr %lx flags %x\n", - l, - temp_i)); - } - break; - - case PPPIOCSFLAGS: - error = verify_area (VERIFY_READ, (void *) l, sizeof (temp_i)); - if (error == 0) { - temp_i = (int) get_fs_long (l); - ppp->flags ^= ((ppp->flags ^ temp_i) & SC_MASK); - PRINTKN (3,(KERN_INFO "ppp_ioctl: set flags to %x\n", temp_i)); - } - break; - - case PPPIOCGASYNCMAP: - error = verify_area (VERIFY_WRITE, (void *) l, sizeof (temp_i)); - if (error == 0) { - put_fs_long (ppp->xmit_async_map[0], l); - PRINTKN (3,(KERN_INFO "ppp_ioctl: get asyncmap: addr %lx asyncmap %lx\n", - l, ppp->xmit_async_map[0])); - } - break; - - case PPPIOCSASYNCMAP: - error = verify_area (VERIFY_READ, (void *) l, sizeof (temp_i)); - if (error == 0) { - memset (ppp->xmit_async_map, 0, sizeof (ppp->xmit_async_map)); - ppp->xmit_async_map[0] = get_fs_long (l); - bset (ppp->xmit_async_map, PPP_FLAG); - bset (ppp->xmit_async_map, PPP_ESC); - PRINTKN (3,(KERN_INFO "ppp_ioctl: set xmit asyncmap %lx\n", - ppp->xmit_async_map[0])); - } - break; - - case PPPIOCRASYNCMAP: - error = verify_area (VERIFY_READ, (void *) l, sizeof (temp_i)); - if (error == 0) { - ppp->recv_async_map = get_fs_long (l); - PRINTKN (3,(KERN_INFO "ppp_ioctl: set recv asyncmap %lx\n", - ppp->recv_async_map)); - } - break; + struct tty_struct *tty = ppp2tty (ppp); + struct ppp_hdr *hdr; +/* + * Validate the tty interface + */ + if (tty == NULL) { + if (ppp->flags & SC_DEBUG) + printk (KERN_ERR + "ppp_dev_xmit: %s not connected to a TTY!\n", + dev->name); + return 0; + } +/* + * Ensure that the PPP device is still up + */ + if (!(dev->flags & IFF_UP)) { + if (ppp->flags & SC_DEBUG) + printk (KERN_WARNING + "ppp_dev_xmit: packet sent on interface %s," + " which is down\n", + dev->name); + return 0; + } +/* + * Detect a change in the transfer size + */ + if (ppp->mtu != ppp2dev (ppp)->mtu) { + ppp_changedmtu (ppp, + ppp2dev (ppp)->mtu, + ppp->mru); + } +/* + * Acquire the lock on the transmission buffer. If the buffer was busy then + * mark the device as busy and return "failure to send, try back later" error. + */ + if (lock_buffer (ppp->wbuf) != 0) { + dev->tbusy = 1; + return 1; + } +/* + * Print the frame being sent + */ + if (ppp->flags & SC_LOG_OUTPKT) + ppp_print_buffer ("ppp outpkt", data, len); +/* + * Send the frame + */ + len += PPP_HARD_HDR_LEN; + hdr = &((struct ppp_hdr *) data)[-1]; - case PPPIOCGUNIT: - error = verify_area (VERIFY_WRITE, (void *) l, sizeof (temp_i)); - if (error == 0) { - put_fs_long (ppp->dev->base_addr, l); - PRINTKN (3,(KERN_INFO "ppp_ioctl: get unit: %d", ppp->dev->base_addr)); - } - break; - - case PPPIOCSINPSIG: - error = verify_area (VERIFY_READ, (void *) l, sizeof (temp_i)); - if (error == 0) { - ppp->inp_sig = (int) get_fs_long (l); - ppp->inp_sig_pid = current->pid; - PRINTKN (3,(KERN_INFO "ppp_ioctl: set input signal %d\n", ppp->inp_sig)); - } - break; - - case PPPIOCSDEBUG: - error = verify_area (VERIFY_READ, (void *) l, sizeof (temp_i)); - if (error == 0) { - ppp_debug = (int) get_fs_long (l); - ppp_debug_netpackets = (ppp_debug & 0xff00) >> 8; - ppp_debug &= 0xff; - PRINTKN (1, (KERN_INFO "ppp_ioctl: set debug level %d, netpacket %d\n", - ppp_debug, ppp_debug_netpackets)); - } - break; - - case PPPIOCGDEBUG: - error = verify_area (VERIFY_WRITE, (void *) l, sizeof (temp_i)); - if (error == 0) { - put_fs_long ((long) (ppp_debug | (ppp_debug_netpackets << 8)), l); - PRINTKN (3,(KERN_INFO "ppp_ioctl: get debug level %d\n", - ppp_debug | (ppp_debug_netpackets << 8))); - } - break; + hdr->address = PPP_ALLSTATIONS; + hdr->control = PPP_UI; + hdr->protocol[0] = proto >> 8; + hdr->protocol[1] = proto; - case PPPIOCGSTAT: - error = verify_area (VERIFY_WRITE, (void *) l, sizeof (struct ppp_stats)); - if (error == 0) { - memcpy_tofs ((void *) l, &ppp->stats, sizeof (struct ppp_stats)); - PRINTKN (3,(KERN_INFO "ppp_ioctl: read statistics\n")); - } - break; - - case PPPIOCGTIME: - error = verify_area (VERIFY_WRITE, (void *) l, 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 *) l, &cur_ddinfo, sizeof (struct ppp_ddinfo)); - PRINTKN (3,(KERN_INFO "ppp_ioctl: read demand dial info\n")); - } - break; - - case PPPIOCGXASYNCMAP: - error = verify_area (VERIFY_WRITE, - (void *) l, - sizeof (ppp->xmit_async_map)); - if (error == 0) { - memcpy_tofs ((void *) l, - ppp->xmit_async_map, - sizeof (ppp->xmit_async_map)); - PRINTKN (3,(KERN_INFO "ppp_ioctl: get xasyncmap: addr %lx\n", l)); - } - break; - - case PPPIOCSXASYNCMAP: - error = verify_area (VERIFY_READ, (void *) l, - sizeof (ppp->xmit_async_map)); - if (error == 0) { - unsigned long temp_tbl [8]; - - memcpy_fromfs (temp_tbl, (void *) l, sizeof (ppp->xmit_async_map)); - temp_tbl[1] = 0x00000000; /* must not escape 0x20 - 0x3f */ - temp_tbl[2] &= ~0x40000000; /* must not escape 0x5e */ - temp_tbl[3] |= 0x60000000; /* must escape 0x7d and 0x7e */ - - 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_ioctl: set xasyncmap\n")); - } - } - break; - - case PPPIOCSMAXCID: - error = verify_area (VERIFY_READ, (void *) l, sizeof (temp_i)); - if (error == 0) { - temp_i = (int) get_fs_long (l) + 1; - PRINTKN (3,(KERN_INFO "ppp_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; - -#ifdef NEW_TTY_DRIVERS - /* Allow stty to read, but not set, the serial port */ - case TCGETS: - case TCGETA: - error = n_tty_ioctl(tty, file, i, l); - break; -#endif + return ppp_dev_xmit_frame (ppp, ppp->wbuf, (u_char *) hdr, len); +} /* - * All other ioctl() events will come here. + * This is just an interum solution until the 1.3 kernel's networking is + * available. The 1.2 kernel has problems with device headers before the + * buffers. + * + * This routine should be deleted, and the ppp_dev_xmit_ipx1 routine called + * by this name. */ - default: - PRINTKN (1,(KERN_ERR "ppp_ioctl: invalid ioctl: %x, addr %lx\n", - i, - l)); -#ifdef NEW_TTY_DRIVERS - error = -ENOIOCTLCMD; -#else - error = -EINVAL; -#endif - break; - } - return error; -} - -static int -ppp_select (struct tty_struct *tty, struct inode * inode, - struct file * filp, int sel_type, select_table * wait) +int +ppp_dev_xmit_ipx (struct device *dev, struct ppp *ppp, + u_char *data, int len, int proto) { - struct ppp *ppp = ppp_find (tty); - - if (!ppp || ppp->magic != PPP_MAGIC) { - PRINTK ((KERN_ERR "ppp_select: can't find PPP block from tty!\n")) - return -EBADF; - } - - /* If the PPP protocol is no longer active, return false */ - CHECK_PPP (0); - - /* Process the request based upon the type desired */ - switch (sel_type) { - case SEL_IN: - if (set_bit(0, &ppp->us_rbuff_lock) == 0) { - /* Test for the presence of data in the queue */ - if (ppp->us_rbuff_head != ppp->us_rbuff_tail) { - clear_bit (0, &ppp->us_rbuff_lock); - return 1; - } - clear_bit (0, &ppp->us_rbuff_lock); - } /* fall through */ - - case SEL_EX: - /* Is there a pending error condition? */ - if (tty->packet && tty->link->ctrl_status) - return 1; - - /* closed? */ - if (tty->flags & (1 << TTY_SLAVE_CLOSED)) - return 1; - - /* If the tty is disconnected, then this is an exception too */ - if (tty_hung_up_p(filp)) - return 1; + struct ppp_hdr *hdr; + int answer; + + hdr = (struct ppp_hdr *) kmalloc (len + sizeof (struct ppp_hdr), + GFP_ATOMIC); + if (hdr == NULL) + answer = 1; + else { + memcpy (&hdr[1], data, len); + answer = (dev, ppp, (u_char *) &hdr[1], len, proto); + kfree (hdr); + } - select_wait (&ppp->read_wait, wait); - break; - - case SEL_OUT: - if (ppp_lock (ppp)) { - if (ppp->sending == 0) { - ppp_unlock (ppp); - return 1; - } - ppp_unlock (ppp); - } - select_wait (&ppp->write_wait, wait); - break; - } - return 0; + return answer; } -/************************************************************* - * 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...). - *************************************************************/ +/* + * Send a frame to the remote. + */ int -ppp_xmit(struct sk_buff *skb, struct device *dev) +ppp_dev_xmit (sk_buff *skb, struct device *dev) { - struct tty_struct *tty; - struct ppp *ppp; - unsigned char *p; - unsigned short proto; - int len; - - /* just a little sanity check. */ - if (skb == NULL) { - PRINTKN(3,(KERN_WARNING "ppp_xmit: null packet!\n")); - return 0; - } - - /* Get pointers to the various components */ - ppp = &ppp_ctrl[dev->base_addr]; - tty = ppp->tty; - p = (unsigned char *) (skb + 1); - len = skb->len; - proto = PROTO_IP; - - PRINTKN(4,(KERN_DEBUG "ppp_xmit [%s]: skb %lX busy %d\n", dev->name, - (unsigned long int) skb, ppp->sending)); - - CHECK_PPP(0); - - if (tty == NULL) { - PRINTKN(1,(KERN_ERR "ppp_xmit: %s not connected to a TTY!\n", dev->name)); - goto done; - } - - if (!(dev->flags & IFF_UP)) { - PRINTKN(1,(KERN_WARNING - "ppp_xmit: packet sent on interface %s, which is down for IP\n", - dev->name)); - goto done; - } - - /* get length from IP header as per Alan Cox bugfix for slip.c */ - if (len < sizeof(struct iphdr)) { - PRINTKN(0,(KERN_ERR "ppp_xmit: given runt packet, ignoring\n")); - return 1; - } - len = ntohs( ((struct iphdr *)(skb->data)) -> tot_len ); - - /* If doing demand dial then divert the first frame to pppd. */ - if (ppp->flags & SC_IP_DOWN) { - if (ppp->flags & SC_IP_FLUSH == 0) { - if (ppp_us_queue (ppp, proto, p, len)) - ppp->flags |= SC_IP_FLUSH; - } - goto done; - } - - /* Attempt to acquire send lock */ - if (ppp->sending || !ppp_lock(ppp)) { - PRINTKN(3,(KERN_WARNING "ppp_xmit: busy\n")); - ppp->stats.sbusy++; - return 1; - } - - ppp->xhead = ppp->xbuff; - - /* try to compress, if VJ compression mode is on */ - if (ppp->flags & SC_COMP_TCP) { - /* NOTE: last 0 argument says never to compress connection ID */ - len = slhc_compress(ppp->slcomp, p, len, ppp->cbuff, &p, 0); - if (p[0] & SL_TYPE_COMPRESSED_TCP) - proto = PROTO_VJCOMP; - else { - if (p[0] >= SL_TYPE_UNCOMPRESSED_TCP) { - proto = PROTO_VJUNCOMP; - p[0] = (p[0] & 0x0f) | 0x40; - } - } - } - - /* increment appropriate counter */ - if (proto == PROTO_VJCOMP) - ++ppp->stats.scomp; - else - ++ppp->stats.suncomp; - - if (ppp_debug_netpackets) { - struct iphdr *iph = (struct iphdr *) (skb + 1); - 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)) - } - - /* start of frame: FLAG ALL_STATIONS CONTROL */ -#ifdef OPTIMIZE_FLAG_TIME - if (jiffies - ppp->last_xmit > OPTIMIZE_FLAG_TIME) - *ppp->xhead++ = PPP_FLAG; - ppp->last_xmit = jiffies; -#else - *ppp->xhead++ = PPP_FLAG; + int answer; + u_char *data; + struct ppp *ppp = dev2ppp (dev); + struct tty_struct *tty = ppp2tty (ppp); +/* + * just a little sanity check. + */ + if (skb == NULL) { + if (ppp->flags & SC_DEBUG) + printk (KERN_WARNING "ppp_dev_xmit: null packet!\n"); + return 0; + } +/* + * Avoid timing problem should tty hangup while data is queued to be sent + */ + if (!ppp->inuse) { + dev_kfree_skb (skb, FREE_WRITE); + dev_close (dev); + return 0; + } +/* + * Validate the tty linkage + */ + if (ppp->flags & SC_DEBUG) + printk (KERN_DEBUG "ppp_dev_xmit [%s]: skb %X\n", + dev->name, (int) skb); +/* + * Validate the tty interface + */ + if (tty == NULL) { + if (ppp->flags & SC_DEBUG) + printk (KERN_ERR + "ppp_dev_xmit: %s not connected to a TTY!\n", + dev->name); + dev_kfree_skb (skb, FREE_WRITE); + return 0; + } +/* + * Fetch the pointer to the data + */ + data = skb_data (skb); +/* + * Look at the protocol in the skb to determine the difference between + * an IP frame and an IPX frame. + */ + +#ifdef NEW_SKBUFF + switch (skb->protocol) { + case htons (ETH_P_IPX): + answer = ppp_dev_xmit_ipx (dev, ppp, data, skb->len, PPP_IPX); + break; + + case htons (ETH_P_IP): + answer = ppp_dev_xmit_ip (dev, ppp, data); + break; + + default: /* All others have no support at this time. */ + dev_kfree_skb (skb, FREE_WRITE); + return 0; + } +#else + answer = ppp_dev_xmit_ip (dev, ppp, data); #endif - ppp->fcs = PPP_FCS_INIT; - if (!(ppp->flags & SC_COMP_AC)) { - ppp_stuff_char(ppp, PPP_ADDRESS); - ppp_stuff_char(ppp, PPP_CONTROL); - } - - if (!(ppp->flags & SC_COMP_PROT) || (proto & 0xff00)) - ppp_stuff_char(ppp, proto>>8); - ppp_stuff_char(ppp, proto&0xff); - - /* data part */ - while (len-- > 0) - ppp_stuff_char(ppp, *p++); - - /* fcs and flag */ - ppp_add_fcs(ppp); - *ppp->xhead++ = PPP_FLAG; - - /* update the time for demand dial function */ - ppp->ddinfo.ip_sjiffies = jiffies; - - /* send it! */ - if (ppp_debug >= 6) - ppp_print_buffer ("xmit buffer", ppp->xbuff, ppp->xhead - ppp->xbuff, KERNEL_DS); - else { - PRINTKN (4,(KERN_DEBUG - "ppp_write: writing %d chars\n", ppp->xhead - ppp->xbuff)); - } - - ppp_kick_tty(ppp); - - done: - if (skb->free) - kfree_skb(skb, FREE_WRITE); - return 0; +/* + * This is the end of the transmission. Release the buffer if it was sent. + */ + if (answer == 0) + dev_kfree_skb (skb, FREE_WRITE); + return answer; } - -static unsigned short -ppp_type_trans (struct sk_buff *skb, struct device *dev) + +/* + * Generate the statistic information for the /proc/net/dev listing. + */ + +static struct enet_statistics * +ppp_dev_stats (struct device *dev) { - return(htons(ETH_P_IP)); + struct ppp *ppp = dev2ppp (dev); + static struct enet_statistics ppp_stats; + + ppp_stats.rx_packets = ppp->stats.ppp_ipackets; + ppp_stats.rx_errors = ppp->stats.ppp_ierrors; + ppp_stats.rx_dropped = ppp->stats.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->stats.ppp_opackets; + ppp_stats.tx_errors = ppp->stats.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; + + if (ppp->flags & SC_DEBUG) + printk (KERN_INFO "ppp_dev_stats called"); + return &ppp_stats; } -#ifdef NET02D -static int -ppp_header(unsigned char *buff, struct device *dev, unsigned short type, - unsigned long daddr, unsigned long saddr, unsigned len) +#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. + */ + +static int ppp_dev_input (struct protocol *self, struct protocol *lower, + sk_buff *skb, void *saddr, void *daddr) { - return(0); + return protocol_pass_demultiplex(self, NULL, skb, NULL, NULL); } -static int -ppp_rebuild_header(void *buff, struct device *dev) +static int ppp_dev_output (struct protocol *self, sk_buff *skb, int type, + int subid, void *saddr, void *daddr, void *opt) { - return(0); + 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; } -static void -ppp_add_arp(unsigned long addr, struct sk_buff *skb, struct device *dev) +static int ppp_dev_getkey(int protocol, int subid, unsigned char *key) { + switch (protocol) + { + case htons (ETH_P_IP): + case htons (ETH_P_IPX): + return 0; + + default: + break; + } + + return -EAFNOSUPPORT; } #else -static int -ppp_header(unsigned char *buff, struct device *dev, unsigned short type, - void *daddr, void *saddr, unsigned len, struct sk_buff *skb) +/* + * 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. + */ + +static unsigned short +ppp_dev_type (sk_buff *skb, struct device *dev) { - return(0); + return (htons (ETH_P_IP)); } static int -ppp_rebuild_header(void *buff, struct device *dev, unsigned long raddr, - struct sk_buff *skb) +ppp_dev_header (u_char * buff, struct device *dev, unsigned short type, + void *daddr, void *saddr, unsigned len, sk_buff *skb) { - return(0); + return (0); } -#endif -static struct enet_statistics * -ppp_get_stats (struct device *dev) +static int +ppp_dev_rebuild (void *buff, struct device *dev, unsigned long raddr, + sk_buff *skb) { - struct ppp *ppp = &ppp_ctrl[dev->base_addr]; - static struct enet_statistics ppp_stats; - - ppp_stats.rx_packets = ppp->stats.rcomp + ppp->stats.runcomp; - ppp_stats.rx_errors = ppp->stats.rerrors; - ppp_stats.rx_dropped = ppp->stats.tossed; - ppp_stats.rx_fifo_errors = 0; - ppp_stats.rx_length_errors = ppp->stats.runts; - ppp_stats.rx_over_errors = ppp->stats.roverrun; - ppp_stats.rx_crc_errors = 0; - ppp_stats.rx_frame_errors = 0; - ppp_stats.tx_packets = ppp->stats.scomp + ppp->stats.suncomp; - ppp_stats.tx_errors = ppp->stats.serrors; - ppp_stats.tx_dropped = 0; - ppp_stats.tx_fifo_errors = 0; - ppp_stats.collisions = ppp->stats.sbusy; - 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_get_stats called")); - return &ppp_stats; + return (0); } +#endif /************************************************************* * UTILITIES * Miscellany called by various functions above. *************************************************************/ -#ifndef NEW_TTY_DRIVERS -/* find a PPP channel given a TTY */ -struct ppp * -ppp_find(struct tty_struct *tty) -{ - int i; - for (i = 0; i < PPP_NRUNIT; i++) - if (ppp_ctrl[i].inuse && (ppp_ctrl[i].tty == tty)) return &ppp_ctrl[i]; - - return NULL; -} -#endif - -/* allocate a PPP channel */ +/* allocate or create a PPP channel */ static struct ppp * -ppp_alloc(void) +ppp_alloc (void) { +#if 1 + int if_num; + int status; + ppp_ctrl_t *ctl; + struct device *dev; + struct ppp *ppp; + + /* try to find an free device */ + ctl = ppp_list; + if_num = 0; + + while (ctl) { + ppp = ctl2ppp (ctl); + if (!set_bit(0, &ppp->inuse)) + return (ppp); + ctl = ctl->next; + if (++if_num == INT_MAX) + return (NULL); + } +/* + * There are no available items. Allocate a device from the system pool + */ + ctl = (ppp_ctrl_t *) kmalloc (sizeof(ppp_ctrl_t), GFP_KERNEL); + if (ctl) { + (void) memset(ctl, 0, sizeof(ppp_ctrl_t)); + ppp = ctl2ppp (ctl); + dev = ctl2dev (ctl); + + /* initialize channel control data */ + set_bit(0, &ppp->inuse); + + ppp->line = if_num; + ppp->tty = NULL; + ppp->dev = dev; + + dev->next = NULL; + dev->init = ppp_init_dev; + dev->name = ctl->name; + dev->base_addr = (unsigned long) if_num; + dev->priv = (void *) ppp; + + sprintf (dev->name, "ppp%d", if_num); + + /* link in the new channel */ + ctl->next = ppp_list; + ppp_list = ctl; + +/* register device so that we can be ifconfig'd */ +/* ppp_init_dev() will be called as a side-effect */ + + status = register_netdev (dev); + if (status == 0) { + printk ("registered device %s\n", dev->name); + return (ppp); + } + + printk (KERN_ERR + "ppp_alloc - register_netdev(%s) = %d failure.\n", + dev->name, status); + /* This one will forever be busy as it is not initialized */ + } + return (NULL); +#else int i; for (i = 0; i < PPP_NRUNIT; i++) if (!set_bit(0, &ppp_ctrl[i].inuse)) return &ppp_ctrl[i]; return NULL; +#endif } -/* marks a PPP interface 'busy'. user processes will wait, if - they try to write, and the network code will refrain from sending - return nonzero if succeeded in acquiring lock -*/ - -static int -ppp_lock(struct ppp *ppp) -{ - int flags, locked; - save_flags(flags); - cli(); - locked = ppp->sending; - ppp->sending = 1; - if (ppp->dev->flags & IFF_UP) - ppp->dev->tbusy = 1; - restore_flags(flags); - return locked == 0; -} +/* + * Utility procedures to print a buffer in hex/ascii + */ static void -ppp_unlock(struct ppp *ppp) +ppp_print_hex (register u_char * out, u_char * in, int count) { - int flags; - save_flags(flags); - cli(); - ppp->sending = 0; - if (ppp->dev->flags & IFF_UP) - ppp->dev->tbusy = 0; - restore_flags(flags); + register u_char next_ch; + static char hex[] = "0123456789ABCDEF"; + + while (count-- > 0) { + next_ch = *in++; + *out++ = hex[(next_ch >> 4) & 0x0F]; + *out++ = hex[next_ch & 0x0F]; + ++out; + } } -/* FCS support functions */ - static void -ppp_add_fcs(struct ppp *ppp) +ppp_print_char (register u_char * out, u_char * in, int count) { - unsigned short fcs = ppp->fcs; - - fcs ^= 0xffff; - ppp_stuff_char(ppp, fcs & 0x00ff); - ppp_stuff_char(ppp, (fcs & 0xff00) >> 8); - ASSERT (ppp->fcs == PPP_FCS_GOOD); - PRINTKN (4,(KERN_DEBUG "ppp_add_fcs: fcs is %lx\n", - (long) (unsigned long) fcs)); + register u_char next_ch; + + while (count-- > 0) { + next_ch = *in++; + + if (next_ch < 0x20 || next_ch > 0x7e) + *out++ = '.'; + else { + *out++ = next_ch; + if (next_ch == '%') /* printk/syslogd has a bug !! */ + *out++ = '%'; + } + } + *out = '\0'; } -static int -ppp_check_fcs(struct ppp *ppp) +static void +ppp_print_buffer (const u_char * name, u_char * buf, int count) { - unsigned short fcs = PPP_FCS_INIT, msgfcs; - unsigned char *c = ppp->rbuff; - int i; - - for (i = 0; i < ppp->rcount - 2; i++, c++) - fcs = (fcs >> 8) ^ fcstab[(fcs ^ *c) & 0xff]; + u_char line[44]; + + if (name != (u_char *) NULL) + printk (KERN_DEBUG "ppp: %s, count = %d\n", name, count); + + while (count > 8) { + memset (line, 32, 44); + ppp_print_hex (line, buf, 8); + ppp_print_char (&line[8 * 3], buf, 8); + printk (KERN_DEBUG "%s\n", line); + count -= 8; + buf += 8; + } - fcs ^= 0xffff; - msgfcs = (c[1] << 8) + c[0]; - PRINTKN (4,(KERN_INFO "ppp_check_fcs: got %lx want %lx\n", - (unsigned long) msgfcs, (unsigned long) fcs)); - return fcs == msgfcs; + if (count > 0) { + memset (line, 32, 44); + ppp_print_hex (line, buf, count); + ppp_print_char (&line[8 * 3], buf, count); + printk (KERN_DEBUG "%s\n", line); + } } -static char hex[] = "0123456789ABCDEF"; - -inline void ppp_print_hex (register char *out, char *in, int count); -inline void ppp_print_hex (register char *out, char *in, int count) -{ - register unsigned char next_ch; - - while (count-- > 0) { - next_ch = (unsigned char) get_fs_byte (in); +/************************************************************* + * Module support routines + *************************************************************/ - *out++ = hex[(next_ch >> 4) & 0x0F]; - *out++ = hex[next_ch & 0x0F]; - ++out; - ++in; - } -} +#ifdef MODULE +char kernel_version[] = UTS_RELEASE; -inline void ppp_print_char (register char *out, char *in, int count); -inline void ppp_print_char (register char *out, char *in, int count) +int +init_module(void) { - register unsigned char next_ch; + int status; - while (count-- > 0) { - next_ch = (unsigned char) get_fs_byte (in); - - if (next_ch < 0x20 || next_ch > 0x7e) - *out++ = '.'; - else { - *out++ = next_ch; - if (next_ch == '%') /* printk/syslogd has a bug !! */ - *out++ = '%'; - } - ++in; - } - *out = '\0'; + /* register our line disciplines */ + status = ppp_first_time(); + if (status != 0) { + printk (KERN_INFO + "PPP: ppp_init() failure %d\n", status); + } + return (status); } -static void ppp_print_buffer(const char *name, char *buf, int count, int seg) +void +cleanup_module(void) { - char line [44]; - int old_fs = get_fs(); - - set_fs (seg); - - if (name != (char *) NULL) - PRINTK ((KERN_DEBUG "ppp: %s, count = %d\n", name, count)); - - while (count > 8) { - memset (line, ' ', sizeof (line)); - ppp_print_hex (line, buf, 8); - ppp_print_char (&line[8 * 3], buf, 8); - PRINTK ((KERN_DEBUG "%s\n", line)); - count -= 8; - buf += 8; - } - - if (count > 0) { - memset (line, ' ', sizeof (line)); - ppp_print_hex (line, buf, count); - ppp_print_char (&line[8 * 3], buf, count); - PRINTK ((KERN_DEBUG "%s\n", line)); - } - - set_fs (old_fs); + int status; + ppp_ctrl_t *ctl, *next_ctl; + struct device *dev; + struct ppp *ppp; + int busy_flag = MOD_IN_USE; +/* + * Ensure that the devices are not in operation. + */ + if (!busy_flag) { + ctl = ppp_list; + while (ctl) { + ppp = ctl2ppp (ctl); + if (ppp->inuse && ppp->tty != NULL) { + busy_flag = 1; + break; + } + + dev = ctl2dev (ctl); + if (dev->start || dev->flags & IFF_UP) { + busy_flag = 1; + break; + } + ctl = ctl->next; + } + } + + if (busy_flag) { + printk (KERN_INFO + "PPP: device busy, remove delayed\n"); + return; + } +/* + * Release the tty registration of the line dicipline so that no new entries + * may be created. + */ + status = tty_register_ldisc (N_PPP, NULL); + if (status != 0) + printk (KERN_INFO + "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 + */ + next = ppp_list; + while (next) { + ctl = next; + ppp = ctl2ppp (ctl); + dev = ctl2dev (ctl); + + ppp_release (ppp); + unregister_netdev (dev); +/* + * Release the storage occupied by the control structures + */ + next = ctl->next; + kfree (ctl); + } } +#endif