pppos.h

00001 /**
00002  * @file
00003  * Network Point to Point Protocol over Serial header file.
00004  *
00005  */
00006 
00007 /*
00008  * Redistribution and use in source and binary forms, with or without modification,
00009  * are permitted provided that the following conditions are met:
00010  *
00011  * 1. Redistributions of source code must retain the above copyright notice,
00012  *    this list of conditions and the following disclaimer.
00013  * 2. Redistributions in binary form must reproduce the above copyright notice,
00014  *    this list of conditions and the following disclaimer in the documentation
00015  *    and/or other materials provided with the distribution.
00016  * 3. The name of the author may not be used to endorse or promote products
00017  *    derived from this software without specific prior written permission.
00018  *
00019  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
00020  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
00021  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
00022  * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
00023  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
00024  * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
00025  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
00026  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
00027  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
00028  * OF SUCH DAMAGE.
00029  *
00030  * This file is part of the lwIP TCP/IP stack.
00031  *
00032  */
00033 
00034 #include "netif/ppp/ppp_opts.h"
00035 #if PPP_SUPPORT && PPPOS_SUPPORT /* don't build if not configured for use in lwipopts.h */
00036 
00037 #ifndef PPPOS_H
00038 #define PPPOS_H
00039 
00040 #include "lwip/sys.h"
00041 
00042 #include "ppp.h"
00043 #include "vj.h"
00044 
00045 /* PPP packet parser states.  Current state indicates operation yet to be
00046  * completed. */
00047 enum {
00048   PDIDLE = 0,  /* Idle state - waiting. */
00049   PDSTART,     /* Process start flag. */
00050   PDADDRESS,   /* Process address field. */
00051   PDCONTROL,   /* Process control field. */
00052   PDPROTOCOL1, /* Process protocol field 1. */
00053   PDPROTOCOL2, /* Process protocol field 2. */
00054   PDDATA       /* Process data byte. */
00055 };
00056 
00057 /* PPPoS serial output callback function prototype */
00058 typedef u32_t (*pppos_output_cb_fn)(ppp_pcb *pcb, u8_t *data, u32_t len, void *ctx);
00059 
00060 /*
00061  * Extended asyncmap - allows any character to be escaped.
00062  */
00063 typedef u8_t ext_accm[32];
00064 
00065 /*
00066  * PPPoS interface control block.
00067  */
00068 typedef struct pppos_pcb_s pppos_pcb;
00069 struct pppos_pcb_s {
00070   /* -- below are data that will NOT be cleared between two sessions */
00071   ppp_pcb *ppp;                    /* PPP PCB */
00072   pppos_output_cb_fn output_cb;    /* PPP serial output callback */
00073 
00074   /* -- below are data that will be cleared between two sessions
00075    *
00076    * last_xmit must be the first member of cleared members, because it is
00077    * used to know which part must not be cleared.
00078    */
00079   u32_t last_xmit;                 /* Time of last transmission. */
00080   ext_accm out_accm;               /* Async-Ctl-Char-Map for output. */
00081 
00082   /* flags */
00083   unsigned int open            :1; /* Set if PPPoS is open */
00084   unsigned int pcomp           :1; /* Does peer accept protocol compression? */
00085   unsigned int accomp          :1; /* Does peer accept addr/ctl compression? */
00086 
00087   /* PPPoS rx */
00088   ext_accm in_accm;                /* Async-Ctl-Char-Map for input. */
00089   struct pbuf *in_head, *in_tail;  /* The input packet. */
00090   u16_t in_protocol;               /* The input protocol code. */
00091   u16_t in_fcs;                    /* Input Frame Check Sequence value. */
00092   u8_t in_state;                   /* The input process state. */
00093   u8_t in_escaped;                 /* Escape next character. */
00094 };
00095 
00096 /* Create a new PPPoS session. */
00097 ppp_pcb *pppos_create(struct netif *pppif, pppos_output_cb_fn output_cb,
00098        ppp_link_status_cb_fn link_status_cb, void *ctx_cb);
00099 
00100 #if !NO_SYS && !PPP_INPROC_IRQ_SAFE
00101 /* Pass received raw characters to PPPoS to be decoded through lwIP TCPIP thread. */
00102 err_t pppos_input_tcpip(ppp_pcb *ppp, u8_t *s, int l);
00103 #endif /* !NO_SYS && !PPP_INPROC_IRQ_SAFE */
00104 
00105 /* PPP over Serial: this is the input function to be called for received data. */
00106 void pppos_input(ppp_pcb *ppp, u8_t* data, int len);
00107 
00108 
00109 /*
00110  * Functions called from lwIP
00111  * DO NOT CALL FROM lwIP USER APPLICATION.
00112  */
00113 #if !NO_SYS && !PPP_INPROC_IRQ_SAFE
00114 err_t pppos_input_sys(struct pbuf *p, struct netif *inp);
00115 #endif /* !NO_SYS && !PPP_INPROC_IRQ_SAFE */
00116 
00117 #endif /* PPPOS_H */
00118 #endif /* PPP_SUPPORT && PPPOL2TP_SUPPORT */