linux/include/linux/isdn_ppp.h
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   1/* Linux ISDN subsystem, sync PPP, interface to ipppd
   2 *
   3 * Copyright 1994-1999  by Fritz Elfert (fritz@isdn4linux.de)
   4 * Copyright 1995,96    Thinking Objects Software GmbH Wuerzburg
   5 * Copyright 1995,96    by Michael Hipp (Michael.Hipp@student.uni-tuebingen.de)
   6 * Copyright 2000-2002  by Kai Germaschewski (kai@germaschewski.name)
   7 *
   8 * This software may be used and distributed according to the terms
   9 * of the GNU General Public License, incorporated herein by reference.
  10 *
  11 */
  12
  13#ifndef _LINUX_ISDN_PPP_H
  14#define _LINUX_ISDN_PPP_H
  15
  16#define CALLTYPE_INCOMING 0x1
  17#define CALLTYPE_OUTGOING 0x2
  18#define CALLTYPE_CALLBACK 0x4
  19
  20#define IPPP_VERSION    "2.2.0"
  21
  22struct pppcallinfo
  23{
  24  int calltype;
  25  unsigned char local_num[64];
  26  unsigned char remote_num[64];
  27  int charge_units;
  28};
  29
  30#define PPPIOCGCALLINFO _IOWR('t',128,struct pppcallinfo)
  31#define PPPIOCBUNDLE   _IOW('t',129,int)
  32#define PPPIOCGMPFLAGS _IOR('t',130,int)
  33#define PPPIOCSMPFLAGS _IOW('t',131,int)
  34#define PPPIOCSMPMTU   _IOW('t',132,int)
  35#define PPPIOCSMPMRU   _IOW('t',133,int)
  36#define PPPIOCGCOMPRESSORS _IOR('t',134,unsigned long [8])
  37#define PPPIOCSCOMPRESSOR _IOW('t',135,int)
  38#define PPPIOCGIFNAME      _IOR('t',136, char [IFNAMSIZ] )
  39
  40
  41#define SC_MP_PROT       0x00000200
  42#define SC_REJ_MP_PROT   0x00000400
  43#define SC_OUT_SHORT_SEQ 0x00000800
  44#define SC_IN_SHORT_SEQ  0x00004000
  45
  46#define SC_DECOMP_ON            0x01
  47#define SC_COMP_ON              0x02
  48#define SC_DECOMP_DISCARD       0x04
  49#define SC_COMP_DISCARD         0x08
  50#define SC_LINK_DECOMP_ON       0x10
  51#define SC_LINK_COMP_ON         0x20
  52#define SC_LINK_DECOMP_DISCARD  0x40
  53#define SC_LINK_COMP_DISCARD    0x80
  54
  55#define ISDN_PPP_COMP_MAX_OPTIONS 16
  56
  57#define IPPP_COMP_FLAG_XMIT 0x1
  58#define IPPP_COMP_FLAG_LINK 0x2
  59
  60struct isdn_ppp_comp_data {
  61  int num;
  62  unsigned char options[ISDN_PPP_COMP_MAX_OPTIONS];
  63  int optlen;
  64  int flags;
  65};
  66
  67#ifdef __KERNEL__
  68
  69
  70
  71#ifdef CONFIG_IPPP_FILTER
  72#include <linux/filter.h>
  73#endif
  74
  75#define DECOMP_ERR_NOMEM        (-10)
  76
  77#define MP_END_FRAG    0x40
  78#define MP_BEGIN_FRAG  0x80
  79
  80#define MP_MAX_QUEUE_LEN        16
  81
  82/*
  83 * We need a way for the decompressor to influence the generation of CCP
  84 * Reset-Requests in a variety of ways. The decompressor is already returning
  85 * a lot of information (generated skb length, error conditions) so we use
  86 * another parameter. This parameter is a pointer to a structure which is
  87 * to be marked valid by the decompressor and only in this case is ever used.
  88 * Furthermore, the only case where this data is used is when the decom-
  89 * pressor returns DECOMP_ERROR.
  90 *
  91 * We use this same struct for the reset entry of the compressor to commu-
  92 * nicate to its caller how to deal with sending of a Reset Ack. In this
  93 * case, expra is not used, but other options still apply (suppressing
  94 * sending with rsend, appending arbitrary data, etc).
  95 */
  96
  97#define IPPP_RESET_MAXDATABYTES 32
  98
  99struct isdn_ppp_resetparams {
 100  unsigned char valid:1;        /* rw Is this structure filled at all ? */
 101  unsigned char rsend:1;        /* rw Should we send one at all ? */
 102  unsigned char idval:1;        /* rw Is the id field valid ? */
 103  unsigned char dtval:1;        /* rw Is the data field valid ? */
 104  unsigned char expra:1;        /* rw Is an Ack expected for this Req ? */
 105  unsigned char id;             /* wo Send CCP ResetReq with this id */
 106  unsigned short maxdlen;       /* ro Max bytes to be stored in data field */
 107  unsigned short dlen;          /* rw Bytes stored in data field */
 108  unsigned char *data;          /* wo Data for ResetReq info field */
 109};
 110
 111/*
 112 * this is an 'old friend' from ppp-comp.h under a new name 
 113 * check the original include for more information
 114 */
 115struct isdn_ppp_compressor {
 116  struct isdn_ppp_compressor *next, *prev;
 117  struct module *owner;
 118  int num; /* CCP compression protocol number */
 119  
 120  void *(*alloc) (struct isdn_ppp_comp_data *);
 121  void (*free) (void *state);
 122  int  (*init) (void *state, struct isdn_ppp_comp_data *,
 123                int unit,int debug);
 124  
 125  /* The reset entry needs to get more exact information about the
 126     ResetReq or ResetAck it was called with. The parameters are
 127     obvious. If reset is called without a Req or Ack frame which
 128     could be handed into it, code MUST be set to 0. Using rsparm,
 129     the reset entry can control if and how a ResetAck is returned. */
 130  
 131  void (*reset) (void *state, unsigned char code, unsigned char id,
 132                 unsigned char *data, unsigned len,
 133                 struct isdn_ppp_resetparams *rsparm);
 134  
 135  int  (*compress) (void *state, struct sk_buff *in,
 136                    struct sk_buff *skb_out, int proto);
 137  
 138        int  (*decompress) (void *state,struct sk_buff *in,
 139                            struct sk_buff *skb_out,
 140                            struct isdn_ppp_resetparams *rsparm);
 141  
 142  void (*incomp) (void *state, struct sk_buff *in,int proto);
 143  void (*stat) (void *state, struct compstat *stats);
 144};
 145
 146extern int isdn_ppp_register_compressor(struct isdn_ppp_compressor *);
 147extern int isdn_ppp_unregister_compressor(struct isdn_ppp_compressor *);
 148extern int isdn_ppp_dial_slave(char *);
 149extern int isdn_ppp_hangup_slave(char *);
 150
 151typedef struct {
 152  unsigned long seqerrs;
 153  unsigned long frame_drops;
 154  unsigned long overflows;
 155  unsigned long max_queue_len;
 156} isdn_mppp_stats;
 157
 158typedef struct {
 159  int mp_mrru;                        /* unused                             */
 160  struct sk_buff * frags;       /* fragments sl list -- use skb->next */
 161  long frames;                  /* number of frames in the frame list */
 162  unsigned int seq;             /* last processed packet seq #: any packets
 163                                 * with smaller seq # will be dropped
 164                                 * unconditionally */
 165  spinlock_t lock;
 166  int ref_ct;                            
 167  /* statistics */
 168  isdn_mppp_stats stats;
 169} ippp_bundle;
 170
 171#define NUM_RCV_BUFFS     64
 172
 173struct ippp_buf_queue {
 174  struct ippp_buf_queue *next;
 175  struct ippp_buf_queue *last;
 176  char *buf;                 /* NULL here indicates end of queue */
 177  int len;
 178};
 179
 180/* The data structure for one CCP reset transaction */
 181enum ippp_ccp_reset_states {
 182  CCPResetIdle,
 183  CCPResetSentReq,
 184  CCPResetRcvdReq,
 185  CCPResetSentAck,
 186  CCPResetRcvdAck
 187};
 188
 189struct ippp_ccp_reset_state {
 190  enum ippp_ccp_reset_states state;     /* State of this transaction */
 191  struct ippp_struct *is;               /* Backlink to device stuff */
 192  unsigned char id;                     /* Backlink id index */
 193  unsigned char ta:1;                   /* The timer is active (flag) */
 194  unsigned char expra:1;                /* We expect a ResetAck at all */
 195  int dlen;                             /* Databytes stored in data */
 196  struct timer_list timer;              /* For timeouts/retries */
 197  /* This is a hack but seems sufficient for the moment. We do not want
 198     to have this be yet another allocation for some bytes, it is more
 199     memory management overhead than the whole mess is worth. */
 200  unsigned char data[IPPP_RESET_MAXDATABYTES];
 201};
 202
 203/* The data structure keeping track of the currently outstanding CCP Reset
 204   transactions. */
 205struct ippp_ccp_reset {
 206  struct ippp_ccp_reset_state *rs[256]; /* One per possible id */
 207  unsigned char lastid;                 /* Last id allocated by the engine */
 208};
 209
 210struct ippp_struct {
 211  struct ippp_struct *next_link;
 212  int state;
 213  spinlock_t buflock;
 214  struct ippp_buf_queue rq[NUM_RCV_BUFFS]; /* packet queue for isdn_ppp_read() */
 215  struct ippp_buf_queue *first;  /* pointer to (current) first packet */
 216  struct ippp_buf_queue *last;   /* pointer to (current) last used packet in queue */
 217  wait_queue_head_t wq;
 218  struct task_struct *tk;
 219  unsigned int mpppcfg;
 220  unsigned int pppcfg;
 221  unsigned int mru;
 222  unsigned int mpmru;
 223  unsigned int mpmtu;
 224  unsigned int maxcid;
 225  struct isdn_net_local_s *lp;
 226  int unit;
 227  int minor;
 228  unsigned int last_link_seqno;
 229  long mp_seqno;
 230#ifdef CONFIG_ISDN_PPP_VJ
 231  unsigned char *cbuf;
 232  struct slcompress *slcomp;
 233#endif
 234#ifdef CONFIG_IPPP_FILTER
 235  struct sock_filter *pass_filter;      /* filter for packets to pass */
 236  struct sock_filter *active_filter;    /* filter for pkts to reset idle */
 237  unsigned pass_len, active_len;
 238#endif
 239  unsigned long debug;
 240  struct isdn_ppp_compressor *compressor,*decompressor;
 241  struct isdn_ppp_compressor *link_compressor,*link_decompressor;
 242  void *decomp_stat,*comp_stat,*link_decomp_stat,*link_comp_stat;
 243  struct ippp_ccp_reset *reset; /* Allocated on demand, may never be needed */
 244  unsigned long compflags;
 245};
 246
 247#endif /* __KERNEL__ */
 248#endif /* _LINUX_ISDN_PPP_H */
 249
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