root/include/linux/if_ppp.h

/* */

INCLUDED FROM

   1 #ifndef _LINUX_IF_PPP_H
   2 #define _LINUX_IF_PPP_H
   3 
   4 /* definitions for kernel PPP module
   5    Michael Callahan <callahan@maths.ox.ac.uk>
   6    Nov. 4 1993 */
   7 
   8 /* how many PPP units? */
   9 #ifdef CONFIG_PPP_LOTS
  10 #define PPP_NRUNIT     16
  11 #else
  12 #define PPP_NRUNIT     4
  13 #endif
  14 
  15 #define PPP_VERSION  "0.2.7"
  16 
  17 /* line discipline number */
  18 #define N_PPP          3
  19 
  20 /* Magic value for the ppp structure */
  21 #define PPP_MAGIC 0x5002
  22 
  23 #define PPPIOCGFLAGS     0x5490 /* get configuration flags */
  24 #define PPPIOCSFLAGS     0x5491 /* set configuration flags */
  25 #define PPPIOCGASYNCMAP  0x5492 /* get async map */
  26 #define PPPIOCSASYNCMAP  0x5493 /* set async map */
  27 #define PPPIOCGUNIT      0x5494 /* get ppp unit number */
  28 #define PPPIOCSINPSIG    0x5495 /* set input ready signal */
  29 #define PPPIOCSDEBUG     0x5497 /* set debug level */
  30 #define PPPIOCGDEBUG     0x5498 /* get debug level */
  31 #define PPPIOCGSTAT      0x5499 /* read PPP statistic information */
  32 #define PPPIOCGTIME      0x549A /* read time delta information */
  33 #define PPPIOCGXASYNCMAP 0x549B /* get async table */
  34 #define PPPIOCSXASYNCMAP 0x549C /* set async table */
  35 #define PPPIOCSMRU       0x549D /* set receive unit size for PPP */
  36 #define PPPIOCRASYNCMAP  0x549E /* set receive async map */
  37 #define PPPIOCSMAXCID    0x549F /* set the maximum compression slot id */
  38 
  39 /* special characters in the framing protocol */
  40 #define PPP_ALLSTATIONS 0xff    /* All-Stations broadcast address */
  41 #define PPP_UI          0x03    /* Unnumbered Information */
  42 #define PPP_FLAG        0x7E    /* frame delimiter -- marks frame boundaries */
  43 #define PPP_ADDRESS     0xFF    /* first character of frame   <--  (may be   */
  44 #define PPP_CONTROL     0x03    /* second character of frame  <-- compressed)*/
  45 #define PPP_TRANS       0x20    /* Asynchronous transparency modifier */
  46 #define PPP_ESC         0x7d    /* escape character -- next character is
  47                                    data, and the PPP_TRANS bit should be
  48                                    toggled. PPP_ESC PPP_FLAG is illegal */
  49 
  50 /* protocol numbers */
  51 #define PROTO_IP       0x0021
  52 #define PROTO_VJCOMP   0x002d
  53 #define PROTO_VJUNCOMP 0x002f
  54 
  55 /* FCS support */
  56 #define PPP_FCS_INIT   0xffff
  57 #define PPP_FCS_GOOD   0xf0b8
  58 
  59 /* initial MTU */
  60 #define PPP_MTU        1500
  61 
  62 /* initial MRU */
  63 #define PPP_MRU        PPP_MTU
  64 
  65 /* flags */
  66 #define SC_COMP_PROT    0x00000001      /* protocol compression (output) */
  67 #define SC_COMP_AC      0x00000002      /* header compression (output) */
  68 #define SC_COMP_TCP     0x00000004      /* TCP (VJ) compression (output) */
  69 #define SC_NO_TCP_CCID  0x00000008      /* disable VJ connection-id comp. */
  70 #define SC_REJ_COMP_AC  0x00000010      /* reject adrs/ctrl comp. on input */
  71 #define SC_REJ_COMP_TCP 0x00000020      /* reject TCP (VJ) comp. on input */
  72 #define SC_ENABLE_IP    0x00000100      /* IP packets may be exchanged */
  73 #define SC_IP_DOWN      0x00000200      /* give ip frames to pppd */
  74 #define SC_IP_FLUSH     0x00000400      /* "next time" flag for IP_DOWN */
  75 #define SC_DEBUG        0x00010000      /* enable debug messages */
  76 #define SC_LOG_INPKT    0x00020000      /* log contents of good pkts recvd */
  77 #define SC_LOG_OUTPKT   0x00040000      /* log contents of pkts sent */
  78 #define SC_LOG_RAWIN    0x00080000      /* log all chars received */
  79 #define SC_LOG_FLUSH    0x00100000      /* log all chars flushed */
  80 
  81 /* Flag bits to determine state of input characters */
  82 #define SC_RCV_B7_0     0x01000000      /* have rcvd char with bit 7 = 0 */
  83 #define SC_RCV_B7_1     0x02000000      /* have rcvd char with bit 7 = 0 */
  84 #define SC_RCV_EVNP     0x04000000      /* have rcvd char with even parity */
  85 #define SC_RCV_ODDP     0x08000000      /* have rcvd char with odd parity */
  86 
  87 #define SC_MASK         0x0fffffff      /* bits that user can change */
  88 
  89 /* flag for doing transmitter lockout */
  90 #define SC_XMIT_BUSY    0x10000000      /* ppp_write_wakeup is active */
  91 
  92 /*
  93  * This is the format of the data buffer of a LQP packet. The packet data
  94  * is sent/received to the peer.
  95  */
  96 
  97 struct ppp_lqp_packet_hdr {
  98   unsigned long         LastOutLQRs;    /* Copied from PeerOutLQRs       */
  99   unsigned long         LastOutPackets; /* Copied from PeerOutPackets    */
 100   unsigned long         LastOutOctets;  /* Copied from PeerOutOctets     */
 101   unsigned long         PeerInLQRs;     /* Copied from SavedInLQRs       */
 102   unsigned long         PeerInPackets;  /* Copied from SavedInPackets    */
 103   unsigned long         PeerInDiscards; /* Copied from SavedInDiscards   */
 104   unsigned long         PeerInErrors;   /* Copied from SavedInErrors     */
 105   unsigned long         PeerInOctets;   /* Copied from SavedInOctets     */
 106   unsigned long         PeerOutLQRs;    /* Copied from OutLQRs, plus 1   */
 107   unsigned long         PeerOutPackets; /* Current ifOutUniPackets, + 1  */
 108   unsigned long         PeerOutOctets;  /* Current ifOutOctets + LQR     */
 109   };
 110 
 111 /*
 112  * This data is not sent to the remote. It is updated by the driver when
 113  * a packet is received.
 114  */
 115 
 116 struct ppp_lqp_packet_trailer {
 117   unsigned long         SaveInLQRs;     /* Current InLQRs on reception   */
 118   unsigned long         SaveInPackets;  /* Current ifInUniPackets        */
 119   unsigned long         SaveInDiscards; /* Current ifInDiscards          */
 120   unsigned long         SaveInErrors;   /* Current ifInErrors            */
 121   unsigned long         SaveInOctets;   /* Current ifInOctects           */
 122 };
 123 
 124 /*
 125  * PPP LQP packet. The packet is changed by the driver immediately prior
 126  * to transmission and updated upon reception with the current values.
 127  * So, it must be known to the driver as well as the pppd software.
 128  */
 129 
 130 struct ppp_lpq_packet {
 131   unsigned long                 magic;  /* current magic value           */
 132   struct ppp_lqp_packet_hdr     hdr;    /* Header fields for structure   */
 133   struct ppp_lqp_packet_trailer tail;   /* Trailer fields (not sent)     */
 134 };
 135 
 136 /*
 137  * PPP interface statistics. (used by LQP / pppstats)
 138  */
 139 
 140 struct ppp_stats {
 141   unsigned long         rbytes;         /* bytes received                */
 142   unsigned long         rcomp;          /* compressed packets received   */
 143   unsigned long         runcomp;        /* uncompressed packets received */
 144   unsigned long         rothers;        /* non-ip frames received        */
 145   unsigned long         rerrors;        /* received errors               */
 146   unsigned long         roverrun;       /* "buffer overrun" counter      */
 147   unsigned long         tossed;         /* packets discarded             */
 148   unsigned long         runts;          /* frames too short to process   */
 149   unsigned long         rgiants;        /* frames too large to process   */
 150   unsigned long         sbytes;         /* bytes sent                    */
 151   unsigned long         scomp;          /* compressed packets sent       */
 152   unsigned long         suncomp;        /* uncompressed packets sent     */
 153   unsigned long         sothers;        /* non-ip frames sent            */
 154   unsigned long         serrors;        /* transmitter errors            */
 155   unsigned long         sbusy;          /* "transmitter busy" counter    */
 156 };
 157 
 158 /*
 159  * Demand dial fields
 160  */
 161 
 162 struct ppp_ddinfo {
 163   unsigned long         ip_sjiffies;    /* time when last IP frame sent */
 164   unsigned long         ip_rjiffies;    /* time when last IP frame recvd*/
 165   unsigned long         nip_sjiffies;   /* time when last NON-IP sent   */
 166   unsigned long         nip_rjiffies;   /* time when last NON-IP recvd  */
 167 };
 168 
 169 #ifdef __KERNEL__
 170 
 171 struct ppp {
 172   int                   magic;          /* magic value for structure    */
 173 
 174   /* Bitmapped flag fields. */
 175   char                  inuse;          /* are we allocated?            */
 176   char                  sending;        /* "channel busy" indicator     */
 177   char                  escape;         /* 0x20 if prev char was PPP_ESC*/
 178   char                  toss;           /* toss this frame              */
 179 
 180   unsigned int          flags;          /* miscellany                   */
 181 
 182   unsigned long         xmit_async_map[8]; /* 1 bit means that given control 
 183                                            character is quoted on output*/
 184 
 185   unsigned long         recv_async_map; /* 1 bit means that given control 
 186                                            character is ignored on input*/
 187   int                   mtu;            /* maximum xmit frame size      */
 188   int                   mru;            /* maximum receive frame size   */
 189   unsigned short        fcs;            /* FCS field of current frame   */
 190 
 191   /* Various fields. */
 192   int                   line;           /* PPP channel number           */
 193   struct tty_struct     *tty;           /* ptr to TTY structure         */
 194   struct device         *dev;           /* easy for intr handling       */
 195   struct slcompress     *slcomp;        /* for header compression       */
 196   unsigned long         last_xmit;      /* time of last transmission    */
 197 
 198   /* These are pointers to the malloc()ed frame buffers.
 199      These buffers are used while processing a packet.  If a packet
 200      has to hang around for the user process to read it, it lingers in
 201      the user buffers below. */
 202   unsigned char         *rbuff;         /* receiver buffer              */
 203   unsigned char         *xbuff;         /* transmitter buffer           */
 204   unsigned char         *cbuff;         /* compression buffer           */
 205 
 206   /* These are the various pointers into the buffers. */
 207   unsigned char         *rhead;         /* RECV buffer pointer (head)   */
 208   unsigned char         *rend;          /* RECV buffer pointer (end)    */
 209   int                   rcount;         /* PPP receive counter          */
 210   unsigned char         *xhead;         /* XMIT buffer pointer (head)   */
 211   unsigned char         *xtail;         /* XMIT buffer pointer (end)    */
 212 
 213   /* Structures for interfacing with the user process. */
 214 #define RBUFSIZE 4000
 215   unsigned char         *us_rbuff;      /* circular incoming packet buf.*/
 216   unsigned char         *us_rbuff_end;  /* end of allocated space       */
 217   unsigned char         *us_rbuff_head; /* head of waiting packets      */
 218   unsigned char         *us_rbuff_tail; /* tail of waiting packets      */
 219   unsigned char         us_rbuff_lock;  /* lock: bit 0 head bit 1 tail  */
 220   int                   inp_sig;        /* input ready signal for pgrp  */
 221   int                   inp_sig_pid;    /* process to get notified      */
 222 
 223   /* items to support the select() function */
 224   struct wait_queue     *write_wait;    /* queue for reading processes  */
 225   struct wait_queue     *read_wait;     /* queue for writing processes  */
 226 
 227   /* PPP interface statistics. */
 228   struct ppp_stats      stats;          /* statistic information        */
 229 
 230   /* PPP demand dial information. */
 231   struct ppp_ddinfo     ddinfo;         /* demand dial information      */
 232 };
 233 
 234 #endif  /* __KERNEL__ */
 235 #endif  /* _LINUX_PPP_H */
 236 
 237 

/* */