The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/net/if_sppp.h

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    1 /*
    2  * Defines for synchronous PPP/Cisco link level subroutines.
    3  *
    4  * Copyright (C) 1994 Cronyx Ltd.
    5  * Author: Serge Vakulenko, <vak@cronyx.ru>
    6  *
    7  * Heavily revamped to conform to RFC 1661.
    8  * Copyright (C) 1997, Joerg Wunsch.
    9  *
   10  * This software is distributed with NO WARRANTIES, not even the implied
   11  * warranties for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
   12  *
   13  * Authors grant any other persons or organizations permission to use
   14  * or modify this software as long as this message is kept with the software,
   15  * all derivative works or modified versions.
   16  *
   17  * From: Version 2.0, Fri Oct  6 20:39:21 MSK 1995
   18  *
   19  * $FreeBSD$
   20  */
   21 
   22 #ifndef _NET_IF_SPPP_H_
   23 #define _NET_IF_SPPP_H_ 1
   24 
   25 #define IDX_LCP 0               /* idx into state table */
   26 
   27 struct slcp {
   28         u_long  opts;           /* LCP options to send (bitfield) */
   29         u_long  magic;          /* local magic number */
   30         u_long  mru;            /* our max receive unit */
   31         u_long  their_mru;      /* their max receive unit */
   32         u_long  protos;         /* bitmask of protos that are started */
   33         u_char  echoid;         /* id of last keepalive echo request */
   34         /* restart max values, see RFC 1661 */
   35         int     timeout;
   36         int     max_terminate;
   37         int     max_configure;
   38         int     max_failure;
   39 };
   40 
   41 #define IDX_IPCP 1              /* idx into state table */
   42 
   43 struct sipcp {
   44         u_long  opts;           /* IPCP options to send (bitfield) */
   45         u_int   flags;
   46 #define IPCP_HISADDR_SEEN 1     /* have seen his address already */
   47 #define IPCP_MYADDR_DYN   2     /* my address is dynamically assigned */
   48 #define IPCP_MYADDR_SEEN  4     /* have seen his address already */
   49 };
   50 
   51 #define AUTHNAMELEN     32
   52 #define AUTHKEYLEN      16
   53 
   54 struct sauth {
   55         u_short proto;                  /* authentication protocol to use */
   56         u_short flags;
   57 #define AUTHFLAG_NOCALLOUT      1       /* do not require authentication on */
   58                                         /* callouts */
   59 #define AUTHFLAG_NORECHALLENGE  2       /* do not re-challenge CHAP */
   60         u_char  name[AUTHNAMELEN];      /* system identification name */
   61         u_char  secret[AUTHKEYLEN];     /* secret password */
   62         u_char  challenge[AUTHKEYLEN];  /* random challenge */
   63 };
   64 
   65 #define IDX_PAP         2
   66 #define IDX_CHAP        3
   67 
   68 #define IDX_COUNT (IDX_CHAP + 1) /* bump this when adding cp's! */
   69 
   70 /*
   71  * Don't change the order of this.  Ordering the phases this way allows
   72  * for a comparision of ``pp_phase >= PHASE_AUTHENTICATE'' in order to
   73  * know whether LCP is up.
   74  */
   75 enum ppp_phase {
   76         PHASE_DEAD, PHASE_ESTABLISH, PHASE_TERMINATE,
   77         PHASE_AUTHENTICATE, PHASE_NETWORK
   78 };
   79 
   80 struct sppp {
   81         /* NB: pp_if _must_ be first */
   82         struct  ifnet pp_if;    /* network interface data */
   83         struct  ifqueue pp_fastq; /* fast output queue */
   84         struct  ifqueue pp_cpq; /* PPP control protocol queue */
   85         struct  sppp *pp_next;  /* next interface in keepalive list */
   86         u_int   pp_flags;       /* use Cisco protocol instead of PPP */
   87         u_short pp_alivecnt;    /* keepalive packets counter */
   88         u_short pp_loopcnt;     /* loopback detection counter */
   89         u_long  pp_seq;         /* local sequence number */
   90         u_long  pp_rseq;        /* remote sequence number */
   91         enum ppp_phase pp_phase;        /* phase we're currently in */
   92         int     state[IDX_COUNT];       /* state machine */
   93         u_char  confid[IDX_COUNT];      /* id of last configuration request */
   94         int     rst_counter[IDX_COUNT]; /* restart counter */
   95         int     fail_counter[IDX_COUNT]; /* negotiation failure counter */
   96         struct callout_handle ch[IDX_COUNT]; /* per-proto and if callouts */
   97         struct callout_handle pap_my_to_ch; /* PAP needs one more... */
   98         struct slcp lcp;                /* LCP params */
   99         struct sipcp ipcp;              /* IPCP params */
  100         struct sauth myauth;            /* auth params, i'm peer */
  101         struct sauth hisauth;           /* auth params, i'm authenticator */
  102         /*
  103          * These functions are filled in by sppp_attach(), and are
  104          * expected to be used by the lower layer (hardware) drivers
  105          * in order to communicate the (un)availability of the
  106          * communication link.  Lower layer drivers that are always
  107          * ready to communicate (like hardware HDLC) can shortcut
  108          * pp_up from pp_tls, and pp_down from pp_tlf.
  109          */
  110         void    (*pp_up)(struct sppp *sp);
  111         void    (*pp_down)(struct sppp *sp);
  112         /*
  113          * These functions need to be filled in by the lower layer
  114          * (hardware) drivers if they request notification from the
  115          * PPP layer whether the link is actually required.  They
  116          * correspond to the tls and tlf actions.
  117          */
  118         void    (*pp_tls)(struct sppp *sp);
  119         void    (*pp_tlf)(struct sppp *sp);
  120         /*
  121          * These (optional) functions may be filled by the hardware
  122          * driver if any notification of established connections
  123          * (currently: IPCP up) is desired (pp_con) or any internal
  124          * state change of the interface state machine should be
  125          * signaled for monitoring purposes (pp_chg).
  126          */
  127         void    (*pp_con)(struct sppp *sp);
  128         void    (*pp_chg)(struct sppp *sp, int new_state);
  129         /* These two fields are for use by the lower layer */
  130         void    *pp_lowerp;
  131         int     pp_loweri;
  132 };
  133 
  134 #define PP_KEEPALIVE    0x01    /* use keepalive protocol */
  135 #define PP_CISCO        0x02    /* use Cisco protocol instead of PPP */
  136                                 /* 0x04 was PP_TIMO */
  137 #define PP_CALLIN       0x08    /* we are being called */
  138 #define PP_NEEDAUTH     0x10    /* remote requested authentication */
  139 
  140 
  141 #define PP_MTU          1500    /* default/minimal MRU */
  142 #define PP_MAX_MRU      2048    /* maximal MRU we want to negotiate */
  143 
  144 /*
  145  * Definitions to pass struct sppp data down into the kernel using the
  146  * SIOC[SG]IFGENERIC ioctl interface.
  147  *
  148  * In order to use this, create a struct spppreq, fill in the cmd
  149  * field with SPPPIOGDEFS, and put the address of this structure into
  150  * the ifr_data portion of a struct ifreq.  Pass this struct to a
  151  * SIOCGIFGENERIC ioctl.  Then replace the cmd field by SPPPIOCDEFS,
  152  * modify the defs field as desired, and pass the struct ifreq now
  153  * to a SIOCSIFGENERIC ioctl.
  154  */
  155 
  156 #define SPPPIOGDEFS  ((caddr_t)(('S' << 24) + (1 << 16) + sizeof(struct sppp)))
  157 #define SPPPIOSDEFS  ((caddr_t)(('S' << 24) + (2 << 16) + sizeof(struct sppp)))
  158 
  159 struct spppreq {
  160         int     cmd;
  161         struct sppp defs;
  162 };
  163 
  164 #ifdef KERNEL
  165 void sppp_attach (struct ifnet *ifp);
  166 void sppp_detach (struct ifnet *ifp);
  167 void sppp_input (struct ifnet *ifp, struct mbuf *m);
  168 int sppp_ioctl (struct ifnet *ifp, u_long cmd, void *data);
  169 struct mbuf *sppp_dequeue (struct ifnet *ifp);
  170 struct mbuf *sppp_pick(struct ifnet *ifp);
  171 int sppp_isempty (struct ifnet *ifp);
  172 void sppp_flush (struct ifnet *ifp);
  173 #endif
  174 
  175 #endif /* _NET_IF_SPPP_H_ */

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