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/Frame Relay link level subroutines.
    3  */
    4 /*-
    5  * Copyright (C) 1994-2000 Cronyx Engineering.
    6  * Author: Serge Vakulenko, <vak@cronyx.ru>
    7  *
    8  * Heavily revamped to conform to RFC 1661.
    9  * Copyright (C) 1997, Joerg Wunsch.
   10  *
   11  * This software is distributed with NO WARRANTIES, not even the implied
   12  * warranties for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
   13  *
   14  * Authors grant any other persons or organizations permission to use
   15  * or modify this software as long as this message is kept with the software,
   16  * all derivative works or modified versions.
   17  *
   18  * From: Version 2.0, Fri Oct  6 20:39:21 MSK 1995
   19  *
   20  * $FreeBSD: releng/8.1/sys/net/if_sppp.h 147256 2005-06-10 16:49:24Z brooks $
   21  */
   22 
   23 #ifndef _NET_IF_SPPP_H_
   24 #define _NET_IF_SPPP_H_ 1
   25 
   26 #define IDX_LCP 0               /* idx into state table */
   27 
   28 struct slcp {
   29         u_long  opts;           /* LCP options to send (bitfield) */
   30         u_long  magic;          /* local magic number */
   31         u_long  mru;            /* our max receive unit */
   32         u_long  their_mru;      /* their max receive unit */
   33         u_long  protos;         /* bitmask of protos that are started */
   34         u_char  echoid;         /* id of last keepalive echo request */
   35         /* restart max values, see RFC 1661 */
   36         int     timeout;
   37         int     max_terminate;
   38         int     max_configure;
   39         int     max_failure;
   40 };
   41 
   42 #define IDX_IPCP 1              /* idx into state table */
   43 #define IDX_IPV6CP 2            /* idx into state table */
   44 
   45 struct sipcp {
   46         u_long  opts;           /* IPCP options to send (bitfield) */
   47         u_int   flags;
   48 #define IPCP_HISADDR_SEEN 1     /* have seen his address already */
   49 #define IPCP_MYADDR_DYN   2     /* my address is dynamically assigned */
   50 #define IPCP_MYADDR_SEEN  4     /* have seen his address already */
   51 #ifdef notdef
   52 #define IPV6CP_MYIFID_DYN 8     /* my ifid is dynamically assigned */
   53 #endif
   54 #define IPV6CP_MYIFID_SEEN 0x10 /* have seen his ifid already */
   55 #define IPCP_VJ         0x20    /* can use VJ compression */
   56         int     max_state;      /* VJ: Max-Slot-Id */
   57         int     compress_cid;   /* VJ: Comp-Slot-Id */
   58 };
   59 
   60 #define AUTHNAMELEN     64
   61 #define AUTHKEYLEN      16
   62 
   63 struct sauth {
   64         u_short proto;                  /* authentication protocol to use */
   65         u_short flags;
   66 #define AUTHFLAG_NOCALLOUT      1       /* do not require authentication on */
   67                                         /* callouts */
   68 #define AUTHFLAG_NORECHALLENGE  2       /* do not re-challenge CHAP */
   69         u_char  name[AUTHNAMELEN];      /* system identification name */
   70         u_char  secret[AUTHKEYLEN];     /* secret password */
   71         u_char  challenge[AUTHKEYLEN];  /* random challenge */
   72 };
   73 
   74 #define IDX_PAP         3
   75 #define IDX_CHAP        4
   76 
   77 #define IDX_COUNT (IDX_CHAP + 1) /* bump this when adding cp's! */
   78 
   79 /*
   80  * Don't change the order of this.  Ordering the phases this way allows
   81  * for a comparision of ``pp_phase >= PHASE_AUTHENTICATE'' in order to
   82  * know whether LCP is up.
   83  */
   84 enum ppp_phase {
   85         PHASE_DEAD, PHASE_ESTABLISH, PHASE_TERMINATE,
   86         PHASE_AUTHENTICATE, PHASE_NETWORK
   87 };
   88 
   89 #define PP_MTU          1500    /* default/minimal MRU */
   90 #define PP_MAX_MRU      2048    /* maximal MRU we want to negotiate */
   91 
   92 /*
   93  * This is a cut down struct sppp (see below) that can easily be
   94  * exported to/ imported from userland without the need to include
   95  * dozens of kernel-internal header files.  It is used by the
   96  * SPPPIO[GS]DEFS ioctl commands below.
   97  */
   98 struct sppp_parms {
   99         enum ppp_phase pp_phase;        /* phase we're currently in */
  100         int     enable_vj;              /* VJ header compression enabled */
  101         int     enable_ipv6;            /*
  102                                          * Enable IPv6 negotiations -- only
  103                                          * needed since each IPv4 i/f auto-
  104                                          * matically gets an IPv6 address
  105                                          * assigned, so we can't use this as
  106                                          * a decision.
  107                                          */
  108         struct slcp lcp;                /* LCP params */
  109         struct sipcp ipcp;              /* IPCP params */
  110         struct sipcp ipv6cp;            /* IPv6CP params */
  111         struct sauth myauth;            /* auth params, i'm peer */
  112         struct sauth hisauth;           /* auth params, i'm authenticator */
  113 };
  114 
  115 /*
  116  * Definitions to pass struct sppp_parms data down into the kernel
  117  * using the SIOC[SG]IFGENERIC ioctl interface.
  118  *
  119  * In order to use this, create a struct spppreq, fill in the cmd
  120  * field with SPPPIOGDEFS, and put the address of this structure into
  121  * the ifr_data portion of a struct ifreq.  Pass this struct to a
  122  * SIOCGIFGENERIC ioctl.  Then replace the cmd field by SPPPIOSDEFS,
  123  * modify the defs field as desired, and pass the struct ifreq now
  124  * to a SIOCSIFGENERIC ioctl.
  125  */
  126 
  127 #define SPPPIOGDEFS  ((caddr_t)(('S' << 24) + (1 << 16) +\
  128         sizeof(struct sppp_parms)))
  129 #define SPPPIOSDEFS  ((caddr_t)(('S' << 24) + (2 << 16) +\
  130         sizeof(struct sppp_parms)))
  131 
  132 struct spppreq {
  133         int     cmd;
  134         struct sppp_parms defs;
  135 };
  136 
  137 #ifdef _KERNEL
  138 struct sppp {
  139         struct  ifnet *pp_ifp;    /* network interface data */
  140         struct  ifqueue pp_fastq; /* fast output queue */
  141         struct  ifqueue pp_cpq; /* PPP control protocol queue */
  142         struct  sppp *pp_next;  /* next interface in keepalive list */
  143         u_int   pp_mode;        /* major protocol modes (cisco/ppp/...) */
  144         u_int   pp_flags;       /* sub modes */
  145         u_short pp_alivecnt;    /* keepalive packets counter */
  146         u_short pp_loopcnt;     /* loopback detection counter */
  147         u_long  pp_seq[IDX_COUNT];      /* local sequence number */
  148         u_long  pp_rseq[IDX_COUNT];     /* remote sequence number */
  149         enum ppp_phase pp_phase;        /* phase we're currently in */
  150         int     state[IDX_COUNT];       /* state machine */
  151         u_char  confid[IDX_COUNT];      /* id of last configuration request */
  152         int     rst_counter[IDX_COUNT]; /* restart counter */
  153         int     fail_counter[IDX_COUNT]; /* negotiation failure counter */
  154         int     confflags;      /* administrative configuration flags */
  155 #define CONF_ENABLE_VJ    0x01  /* VJ header compression enabled */
  156 #define CONF_ENABLE_IPV6  0x02  /* IPv6 administratively enabled */
  157         time_t  pp_last_recv;   /* time last packet has been received */
  158         time_t  pp_last_sent;   /* time last packet has been sent */
  159         struct callout ch[IDX_COUNT];   /* per-proto and if callouts */
  160         struct callout pap_my_to_ch;    /* PAP needs one more... */
  161         struct callout keepalive_callout; /* keepalive callout */
  162         struct slcp lcp;                /* LCP params */
  163         struct sipcp ipcp;              /* IPCP params */
  164         struct sipcp ipv6cp;            /* IPv6CP params */
  165         struct sauth myauth;            /* auth params, i'm peer */
  166         struct sauth hisauth;           /* auth params, i'm authenticator */
  167         struct slcompress *pp_comp;     /* for VJ compression */
  168         u_short fr_dlci;                /* Frame Relay DLCI number, 16..1023 */
  169         u_char fr_status;               /* PVC status, active/new/delete */
  170         /*
  171          * These functions are filled in by sppp_attach(), and are
  172          * expected to be used by the lower layer (hardware) drivers
  173          * in order to communicate the (un)availability of the
  174          * communication link.  Lower layer drivers that are always
  175          * ready to communicate (like hardware HDLC) can shortcut
  176          * pp_up from pp_tls, and pp_down from pp_tlf.
  177          */
  178         void    (*pp_up)(struct sppp *sp);
  179         void    (*pp_down)(struct sppp *sp);
  180         /*
  181          * These functions need to be filled in by the lower layer
  182          * (hardware) drivers if they request notification from the
  183          * PPP layer whether the link is actually required.  They
  184          * correspond to the tls and tlf actions.
  185          */
  186         void    (*pp_tls)(struct sppp *sp);
  187         void    (*pp_tlf)(struct sppp *sp);
  188         /*
  189          * These (optional) functions may be filled by the hardware
  190          * driver if any notification of established connections
  191          * (currently: IPCP up) is desired (pp_con) or any internal
  192          * state change of the interface state machine should be
  193          * signaled for monitoring purposes (pp_chg).
  194          */
  195         void    (*pp_con)(struct sppp *sp);
  196         void    (*pp_chg)(struct sppp *sp, int new_state);
  197         /* These two fields are for use by the lower layer */
  198         void    *pp_lowerp;
  199         int     pp_loweri;
  200         /* Lock */
  201         struct mtx      mtx;
  202         /* if_start () wrapper */
  203         void    (*if_start) (struct ifnet *);
  204         struct callout ifstart_callout; /* if_start () scheduler */
  205 };
  206 #define IFP2SP(ifp)     ((struct sppp *)(ifp)->if_l2com)
  207 #define SP2IFP(sp)      ((sp)->pp_ifp)
  208 
  209 /* bits for pp_flags */
  210 #define PP_KEEPALIVE    0x01    /* use keepalive protocol */
  211 #define PP_FR           0x04    /* use Frame Relay protocol instead of PPP */
  212                                 /* 0x04 was PP_TIMO */
  213 #define PP_CALLIN       0x08    /* we are being called */
  214 #define PP_NEEDAUTH     0x10    /* remote requested authentication */
  215 
  216 void sppp_attach (struct ifnet *ifp);
  217 void sppp_detach (struct ifnet *ifp);
  218 void sppp_input (struct ifnet *ifp, struct mbuf *m);
  219 int sppp_ioctl (struct ifnet *ifp, u_long cmd, void *data);
  220 struct mbuf *sppp_dequeue (struct ifnet *ifp);
  221 struct mbuf *sppp_pick(struct ifnet *ifp);
  222 int sppp_isempty (struct ifnet *ifp);
  223 void sppp_flush (struct ifnet *ifp);
  224 
  225 /* Internal functions */
  226 void sppp_fr_input (struct sppp *sp, struct mbuf *m);
  227 struct mbuf *sppp_fr_header (struct sppp *sp, struct mbuf *m, int fam);
  228 void sppp_fr_keepalive (struct sppp *sp);
  229 void sppp_get_ip_addrs(struct sppp *sp, u_long *src, u_long *dst,
  230                        u_long *srcmask);
  231 
  232 #endif
  233 
  234 #endif /* _NET_IF_SPPP_H_ */

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