ppp.h

lwip-1.4.0

/* Error codes. */
#define PPPERR_NONE      0 /* No error. */
#define PPPERR_PARAM    -1 /* Invalid parameter. */
#define PPPERR_OPEN     -2 /* Unable to open PPP session. */
#define PPPERR_DEVICE   -3 /* Invalid I/O device for PPP. */
#define PPPERR_ALLOC    -4 /* Unable to allocate resources. */
#define PPPERR_USER     -5 /* User interrupt. */
#define PPPERR_CONNECT  -6 /* Connection lost. */
#define PPPERR_AUTHFAIL -7 /* Failed authentication challenge. */
#define PPPERR_PROTOCOL -8 /* Failed to meet protocol. */

/*
 * PPP IOCTL commands.
 */
/*
 * Get the up status - 0 for down, non-zero for up.  The argument must
 * point to an int.
 */
#define PPPCTLG_UPSTATUS 100 /* Get the up status - 0 down else up */
#define PPPCTLS_ERRCODE  101 /* Set the error code */
#define PPPCTLG_ERRCODE  102 /* Get the error code */
#define PPPCTLG_FD       103 /* Get the fd associated with the ppp */

/************************
*** PUBLIC DATA TYPES ***
************************/

/*
 * The following struct gives the addresses of procedures to call
 * for a particular protocol.
 */
struct protent {
    u_short protocol;       /* PPP protocol number */
    /* Initialization procedure */
    void (*init) (int unit);
    /* Process a received packet */
    void (*input) (int unit, u_char *pkt, int len);
    /* Process a received protocol-reject */
    void (*protrej) (int unit);
    /* Lower layer has come up */
    void (*lowerup) (int unit);
    /* Lower layer has gone down */
    void (*lowerdown) (int unit);
    /* Open the protocol */
    void (*open) (int unit);
    /* Close the protocol */
    void (*close) (int unit, char *reason);
#if PPP_ADDITIONAL_CALLBACKS
    /* Print a packet in readable form */
    int  (*printpkt) (u_char *pkt, int len,
              void (*printer) (void *, char *, ...),
              void *arg);
    /* Process a received data packet */
    void (*datainput) (int unit, u_char *pkt, int len);
#endif /* PPP_ADDITIONAL_CALLBACKS */
    int  enabled_flag;      /* 0 if protocol is disabled */
    char *name;         /* Text name of protocol */
#if PPP_ADDITIONAL_CALLBACKS
    /* Check requested options, assign defaults */
    void (*check_options) (u_long);
    /* Configure interface for demand-dial */
    int  (*demand_conf) (int unit);
    /* Say whether to bring up link for this pkt */
    int  (*active_pkt) (u_char *pkt, int len);
#endif /* PPP_ADDITIONAL_CALLBACKS */
};

/*
 * The following structure records the time in seconds since
 * the last NP packet was sent or received.
 */
struct ppp_idle {
  u_short xmit_idle;      /* seconds since last NP packet sent */
  u_short recv_idle;      /* seconds since last NP packet received */
};

struct ppp_settings {

  u_int  disable_defaultip : 1;       /* Don't use hostname for default IP addrs */
  u_int  auth_required     : 1;       /* Peer is required to authenticate */
  u_int  explicit_remote   : 1;       /* remote_name specified with remotename opt */
  u_int  refuse_pap        : 1;       /* Don't wanna auth. ourselves with PAP */
  u_int  refuse_chap       : 1;       /* Don't wanna auth. ourselves with CHAP */
  u_int  usehostname       : 1;       /* Use hostname for our_name */
  u_int  usepeerdns        : 1;       /* Ask peer for DNS adds */

  u_short idle_time_limit;            /* Shut down link if idle for this long */
  int  maxconnect;                    /* Maximum connect time (seconds) */

  char user       [MAXNAMELEN   + 1]; /* Username for PAP */
  char passwd     [MAXSECRETLEN + 1]; /* Password for PAP, secret for CHAP */
  char our_name   [MAXNAMELEN   + 1]; /* Our name for authentication purposes */
  char remote_name[MAXNAMELEN   + 1]; /* Peer's name for authentication */
};

struct ppp_addrs {
  ip_addr_t our_ipaddr, his_ipaddr, netmask, dns1, dns2;
};

/*****************************
*** PUBLIC DATA STRUCTURES ***
*****************************/

/* Buffers for outgoing packets. */
extern u_char outpacket_buf[NUM_PPP][PPP_MRU+PPP_HDRLEN];

extern struct ppp_settings ppp_settings;

extern struct protent *ppp_protocols[]; /* Table of pointers to supported protocols */


/***********************
*** PUBLIC FUNCTIONS ***
***********************/

/* Initialize the PPP subsystem. */
void pppInit(void);

/* Warning: Using PPPAUTHTYPE_ANY might have security consequences.
 * RFC 1994 says:
 *
 * In practice, within or associated with each PPP server, there is a
 * database which associates "user" names with authentication
 * information ("secrets").  It is not anticipated that a particular
 * named user would be authenticated by multiple methods.  This would
 * make the user vulnerable to attacks which negotiate the least secure
 * method from among a set (such as PAP rather than CHAP).  If the same
 * secret was used, PAP would reveal the secret to be used later with
 * CHAP.
 *
 * Instead, for each user name there should be an indication of exactly
 * one method used to authenticate that user name.  If a user needs to
 * make use of different authentication methods under different
 * circumstances, then distinct user names SHOULD be employed, each of
 * which identifies exactly one authentication method.
 *
 */
enum pppAuthType {
    PPPAUTHTYPE_NONE,
    PPPAUTHTYPE_ANY,
    PPPAUTHTYPE_PAP,
    PPPAUTHTYPE_CHAP
};

void pppSetAuth(enum pppAuthType authType, const char *user, const char *passwd);

/*
 * Open a new PPP connection using the given serial I/O device.
 * This initializes the PPP control block but does not
 * attempt to negotiate the LCP session.
 * Return a new PPP connection descriptor on success or
 * an error code (negative) on failure. 
 */
int pppOverSerialOpen(sio_fd_t fd, void (*linkStatusCB)(void *ctx, int errCode, void *arg), void *linkStatusCtx);

/*
 * Open a new PPP Over Ethernet (PPPOE) connection.
 */
int pppOverEthernetOpen(struct netif *ethif, const char *service_name, const char *concentrator_name, void (*linkStatusCB)(void *ctx, int errCode, void *arg), void *linkStatusCtx);

/* for source code compatibility */
#define pppOpen(fd,cb,ls) pppOverSerialOpen(fd,cb,ls)

/*
 * Close a PPP connection and release the descriptor. 
 * Any outstanding packets in the queues are dropped.
 * Return 0 on success, an error code on failure. 
 */
int pppClose(int pd);

/*
 * Indicate to the PPP process that the line has disconnected.
 */
void pppSigHUP(int pd);

/*
 * Get and set parameters for the given connection.
 * Return 0 on success, an error code on failure. 
 */
int  pppIOCtl(int pd, int cmd, void *arg);

/*
 * Return the Maximum Transmission Unit for the given PPP connection.
 */
u_short pppMTU(int pd);

/*
 * Write n characters to a ppp link.
 * RETURN: >= 0 Number of characters written, -1 Failed to write to device.
 */
int pppWrite(int pd, const u_char *s, int n);

void pppInProcOverEthernet(int pd, struct pbuf *pb);

struct pbuf *pppSingleBuf(struct pbuf *p);

void pppLinkTerminated(int pd);

void pppLinkDown(int pd);

void pppos_input(int pd, u_char* data, int len);

/* Configure i/f transmit parameters */
void ppp_send_config (int, u16_t, u32_t, int, int);
/* Set extended transmit ACCM */
void ppp_set_xaccm (int, ext_accm *);
/* Configure i/f receive parameters */
void ppp_recv_config (int, int, u32_t, int, int);
/* Find out how long link has been idle */
int  get_idle_time (int, struct ppp_idle *);

/* Configure VJ TCP header compression */
int  sifvjcomp (int, int, u8_t, u8_t);
/* Configure i/f down (for IP) */
int  sifup (int);
/* Set mode for handling packets for proto */
int  sifnpmode (int u, int proto, enum NPmode mode);
/* Configure i/f down (for IP) */
int  sifdown (int);
/* Configure IP addresses for i/f */
int  sifaddr (int, u32_t, u32_t, u32_t, u32_t, u32_t);
/* Reset i/f IP addresses */
int  cifaddr (int, u32_t, u32_t);
/* Create default route through i/f */
int  sifdefaultroute (int, u32_t, u32_t);
/* Delete default route through i/f */
int  cifdefaultroute (int, u32_t, u32_t);

/* Get appropriate netmask for address */
u32_t GetMask (u32_t); 

#if LWIP_NETIF_STATUS_CALLBACK
void ppp_set_netif_statuscallback(int pd, netif_status_callback_fn status_callback);
#endif /* LWIP_NETIF_STATUS_CALLBACK */
#if LWIP_NETIF_LINK_CALLBACK
void ppp_set_netif_linkcallback(int pd, netif_status_callback_fn link_callback);
#endif /* LWIP_NETIF_LINK_CALLBACK */

#endif /* PPP_SUPPORT */

#endif /* PPP_H */