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1/*****************************************************************************
2* ppp.h - Network Point to Point Protocol header file.
3*
4* Copyright (c) 2003 by Marc Boucher, Services Informatiques (MBSI) inc.
5* portions Copyright (c) 1997 Global Election Systems Inc.
6*
7* The authors hereby grant permission to use, copy, modify, distribute,
8* and license this software and its documentation for any purpose, provided
9* that existing copyright notices are retained in all copies and that this
10* notice and the following disclaimer are included verbatim in any
11* distributions. No written agreement, license, or royalty fee is required
12* for any of the authorized uses.
13*
14* THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS *AS IS* AND ANY EXPRESS OR
15* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17* IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
18* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24*
25******************************************************************************
26* REVISION HISTORY
27*
28* 03-01-01 Marc Boucher <marc@mbsi.ca>
29* Ported to lwIP.
30* 97-11-05 Guy Lancaster <glanca@gesn.com>, Global Election Systems Inc.
31* Original derived from BSD codes.
32*****************************************************************************/
33
34#ifndef PPP_H
35#define PPP_H
36
37#include "lwip/opt.h"
38
39#if PPP_SUPPORT /* don't build if not configured for use in lwipopts.h */
40
41#include "lwip/def.h"
42#include "lwip/sio.h"
43#include "lwip/api.h"
44#include "lwip/sockets.h"
45#include "lwip/stats.h"
46#include "lwip/mem.h"
47#include "lwip/tcpip.h"
48#include "lwip/netif.h"
49
50/*
51 * pppd.h - PPP daemon global declarations.
52 *
53 * Copyright (c) 1989 Carnegie Mellon University.
54 * All rights reserved.
55 *
56 * Redistribution and use in source and binary forms are permitted
57 * provided that the above copyright notice and this paragraph are
58 * duplicated in all such forms and that any documentation,
59 * advertising materials, and other materials related to such
60 * distribution and use acknowledge that the software was developed
61 * by Carnegie Mellon University. The name of the
62 * University may not be used to endorse or promote products derived
63 * from this software without specific prior written permission.
64 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
65 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
66 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
67 *
68 */
69/*
70 * ppp_defs.h - PPP definitions.
71 *
72 * Copyright (c) 1994 The Australian National University.
73 * All rights reserved.
74 *
75 * Permission to use, copy, modify, and distribute this software and its
76 * documentation is hereby granted, provided that the above copyright
77 * notice appears in all copies. This software is provided without any
78 * warranty, express or implied. The Australian National University
79 * makes no representations about the suitability of this software for
80 * any purpose.
81 *
82 * IN NO EVENT SHALL THE AUSTRALIAN NATIONAL UNIVERSITY BE LIABLE TO ANY
83 * PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
84 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF
85 * THE AUSTRALIAN NATIONAL UNIVERSITY HAVE BEEN ADVISED OF THE POSSIBILITY
86 * OF SUCH DAMAGE.
87 *
88 * THE AUSTRALIAN NATIONAL UNIVERSITY SPECIFICALLY DISCLAIMS ANY WARRANTIES,
89 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
90 * AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
91 * ON AN "AS IS" BASIS, AND THE AUSTRALIAN NATIONAL UNIVERSITY HAS NO
92 * OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS,
93 * OR MODIFICATIONS.
94 */
95
96#define TIMEOUT(f, a, t) sys_untimeout((f), (a)), sys_timeout((t)*1000, (f), (a))
97#define UNTIMEOUT(f, a) sys_untimeout((f), (a))
98
99
100#ifndef __u_char_defined
101
102/* Type definitions for BSD code. */
103typedef unsigned long u_long;
104typedef unsigned int u_int;
105typedef unsigned short u_short;
106typedef unsigned char u_char;
107
108#endif
109
110/*
111 * Constants and structures defined by the internet system,
112 * Per RFC 790, September 1981, and numerous additions.
113 */
114
115/*
116 * The basic PPP frame.
117 */
118#define PPP_HDRLEN 4 /* octets for standard ppp header */
119#define PPP_FCSLEN 2 /* octets for FCS */
120
121
122/*
123 * Significant octet values.
124 */
125#define PPP_ALLSTATIONS 0xff /* All-Stations broadcast address */
126#define PPP_UI 0x03 /* Unnumbered Information */
127#define PPP_FLAG 0x7e /* Flag Sequence */
128#define PPP_ESCAPE 0x7d /* Asynchronous Control Escape */
129#define PPP_TRANS 0x20 /* Asynchronous transparency modifier */
130
131/*
132 * Protocol field values.
133 */
134#define PPP_IP 0x21 /* Internet Protocol */
135#define PPP_AT 0x29 /* AppleTalk Protocol */
136#define PPP_VJC_COMP 0x2d /* VJ compressed TCP */
137#define PPP_VJC_UNCOMP 0x2f /* VJ uncompressed TCP */
138#define PPP_COMP 0xfd /* compressed packet */
139#define PPP_IPCP 0x8021 /* IP Control Protocol */
140#define PPP_ATCP 0x8029 /* AppleTalk Control Protocol */
141#define PPP_CCP 0x80fd /* Compression Control Protocol */
142#define PPP_LCP 0xc021 /* Link Control Protocol */
143#define PPP_PAP 0xc023 /* Password Authentication Protocol */
144#define PPP_LQR 0xc025 /* Link Quality Report protocol */
145#define PPP_CHAP 0xc223 /* Cryptographic Handshake Auth. Protocol */
146#define PPP_CBCP 0xc029 /* Callback Control Protocol */
147
148/*
149 * Values for FCS calculations.
150 */
151#define PPP_INITFCS 0xffff /* Initial FCS value */
152#define PPP_GOODFCS 0xf0b8 /* Good final FCS value */
153#define PPP_FCS(fcs, c) (((fcs) >> 8) ^ fcstab[((fcs) ^ (c)) & 0xff])
154
155/*
156 * Extended asyncmap - allows any character to be escaped.
157 */
158typedef u_char ext_accm[32];
159
160/*
161 * What to do with network protocol (NP) packets.
162 */
163enum NPmode {
164 NPMODE_PASS, /* pass the packet through */
165 NPMODE_DROP, /* silently drop the packet */
166 NPMODE_ERROR, /* return an error */
167 NPMODE_QUEUE /* save it up for later. */
168};
169
170/*
171 * Inline versions of get/put char/short/long.
172 * Pointer is advanced; we assume that both arguments
173 * are lvalues and will already be in registers.
174 * cp MUST be u_char *.
175 */
176#define GETCHAR(c, cp) { \
177 (c) = *(cp)++; \
178}
179#define PUTCHAR(c, cp) { \
180 *(cp)++ = (u_char) (c); \
181}
182
183
184#define GETSHORT(s, cp) { \
185 (s) = *(cp); (cp)++; (s) <<= 8; \
186 (s) |= *(cp); (cp)++; \
187}
188#define PUTSHORT(s, cp) { \
189 *(cp)++ = (u_char) ((s) >> 8); \
190 *(cp)++ = (u_char) (s & 0xff); \
191}
192
193#define GETLONG(l, cp) { \
194 (l) = *(cp); (cp)++; (l) <<= 8; \
195 (l) |= *(cp); (cp)++; (l) <<= 8; \
196 (l) |= *(cp); (cp)++; (l) <<= 8; \
197 (l) |= *(cp); (cp)++; \
198}
199#define PUTLONG(l, cp) { \
200 *(cp)++ = (u_char) ((l) >> 24); \
201 *(cp)++ = (u_char) ((l) >> 16); \
202 *(cp)++ = (u_char) ((l) >> 8); \
203 *(cp)++ = (u_char) (l); \
204}
205
206
207#define INCPTR(n, cp) ((cp) += (n))
208#define DECPTR(n, cp) ((cp) -= (n))
209
210#define BCMP(s0, s1, l) memcmp((u_char *)(s0), (u_char *)(s1), (l))
211#define BCOPY(s, d, l) MEMCPY((d), (s), (l))
212#define BZERO(s, n) memset(s, 0, n)
213
214#if PPP_DEBUG
215#define PRINTMSG(m, l) { m[l] = '\0'; ppp_trace(LOG_INFO, "Remote message: %s\n", m); }
216#else /* PPP_DEBUG */
217#define PRINTMSG(m, l)
218#endif /* PPP_DEBUG */
219
220/*
221 * MAKEHEADER - Add PPP Header fields to a packet.
222 */
223#define MAKEHEADER(p, t) { \
224 PUTCHAR(PPP_ALLSTATIONS, p); \
225 PUTCHAR(PPP_UI, p); \
226 PUTSHORT(t, p); }
227
228/*************************
229*** PUBLIC DEFINITIONS ***
230*************************/
231
232/* Error codes. */
233#define PPPERR_NONE 0 /* No error. */
234#define PPPERR_PARAM -1 /* Invalid parameter. */
235#define PPPERR_OPEN -2 /* Unable to open PPP session. */
236#define PPPERR_DEVICE -3 /* Invalid I/O device for PPP. */
237#define PPPERR_ALLOC -4 /* Unable to allocate resources. */
238#define PPPERR_USER -5 /* User interrupt. */
239#define PPPERR_CONNECT -6 /* Connection lost. */
240#define PPPERR_AUTHFAIL -7 /* Failed authentication challenge. */
241#define PPPERR_PROTOCOL -8 /* Failed to meet protocol. */
242
243/*
244 * PPP IOCTL commands.
245 */
246/*
247 * Get the up status - 0 for down, non-zero for up. The argument must
248 * point to an int.
249 */
250#define PPPCTLG_UPSTATUS 100 /* Get the up status - 0 down else up */
251#define PPPCTLS_ERRCODE 101 /* Set the error code */
252#define PPPCTLG_ERRCODE 102 /* Get the error code */
253#define PPPCTLG_FD 103 /* Get the fd associated with the ppp */
254
255/************************
256*** PUBLIC DATA TYPES ***
257************************/
258
259/*
260 * The following struct gives the addresses of procedures to call
261 * for a particular protocol.
262 */
263struct protent {
264 u_short protocol; /* PPP protocol number */
265 /* Initialization procedure */
266 void (*init) (int unit);
267 /* Process a received packet */
268 void (*input) (int unit, u_char *pkt, int len);
269 /* Process a received protocol-reject */
270 void (*protrej) (int unit);
271 /* Lower layer has come up */
272 void (*lowerup) (int unit);
273 /* Lower layer has gone down */
274 void (*lowerdown) (int unit);
275 /* Open the protocol */
276 void (*open) (int unit);
277 /* Close the protocol */
278 void (*close) (int unit, char *reason);
279#if 0
280 /* Print a packet in readable form */
281 int (*printpkt) (u_char *pkt, int len,
282 void (*printer) (void *, char *, ...),
283 void *arg);
284 /* Process a received data packet */
285 void (*datainput) (int unit, u_char *pkt, int len);
286#endif
287 int enabled_flag; /* 0 iff protocol is disabled */
288 char *name; /* Text name of protocol */
289#if 0
290 /* Check requested options, assign defaults */
291 void (*check_options) (u_long);
292 /* Configure interface for demand-dial */
293 int (*demand_conf) (int unit);
294 /* Say whether to bring up link for this pkt */
295 int (*active_pkt) (u_char *pkt, int len);
296#endif
297};
298
299/*
300 * The following structure records the time in seconds since
301 * the last NP packet was sent or received.
302 */
303struct ppp_idle {
304 u_short xmit_idle; /* seconds since last NP packet sent */
305 u_short recv_idle; /* seconds since last NP packet received */
306};
307
308struct ppp_settings {
309
310 u_int disable_defaultip : 1; /* Don't use hostname for default IP addrs */
311 u_int auth_required : 1; /* Peer is required to authenticate */
312 u_int explicit_remote : 1; /* remote_name specified with remotename opt */
313 u_int refuse_pap : 1; /* Don't wanna auth. ourselves with PAP */
314 u_int refuse_chap : 1; /* Don't wanna auth. ourselves with CHAP */
315 u_int usehostname : 1; /* Use hostname for our_name */
316 u_int usepeerdns : 1; /* Ask peer for DNS adds */
317
318 u_short idle_time_limit; /* Shut down link if idle for this long */
319 int maxconnect; /* Maximum connect time (seconds) */
320
321 char user [MAXNAMELEN + 1]; /* Username for PAP */
322 char passwd [MAXSECRETLEN + 1]; /* Password for PAP, secret for CHAP */
323 char our_name [MAXNAMELEN + 1]; /* Our name for authentication purposes */
324 char remote_name[MAXNAMELEN + 1]; /* Peer's name for authentication */
325};
326
327struct ppp_addrs {
328 struct ip_addr our_ipaddr, his_ipaddr, netmask, dns1, dns2;
329};
330
331/*****************************
332*** PUBLIC DATA STRUCTURES ***
333*****************************/
334
335/* Buffers for outgoing packets. */
336extern u_char *outpacket_buf[NUM_PPP];
337
338extern struct ppp_settings ppp_settings;
339
340extern struct protent *ppp_protocols[]; /* Table of pointers to supported protocols */
341
342
343/***********************
344*** PUBLIC FUNCTIONS ***
345***********************/
346
347/* Initialize the PPP subsystem. */
348err_t pppInit(void);
349
350/* Warning: Using PPPAUTHTYPE_ANY might have security consequences.
351 * RFC 1994 says:
352 *
353 * In practice, within or associated with each PPP server, there is a
354 * database which associates "user" names with authentication
355 * information ("secrets"). It is not anticipated that a particular
356 * named user would be authenticated by multiple methods. This would
357 * make the user vulnerable to attacks which negotiate the least secure
358 * method from among a set (such as PAP rather than CHAP). If the same
359 * secret was used, PAP would reveal the secret to be used later with
360 * CHAP.
361 *
362 * Instead, for each user name there should be an indication of exactly
363 * one method used to authenticate that user name. If a user needs to
364 * make use of different authentication methods under different
365 * circumstances, then distinct user names SHOULD be employed, each of
366 * which identifies exactly one authentication method.
367 *
368 */
369enum pppAuthType {
370 PPPAUTHTYPE_NONE,
371 PPPAUTHTYPE_ANY,
372 PPPAUTHTYPE_PAP,
373 PPPAUTHTYPE_CHAP
374};
375
376void pppSetAuth(enum pppAuthType authType, const char *user, const char *passwd);
377
378/*
379 * Open a new PPP connection using the given serial I/O device.
380 * This initializes the PPP control block but does not
381 * attempt to negotiate the LCP session.
382 * Return a new PPP connection descriptor on success or
383 * an error code (negative) on failure.
384 */
385int pppOverSerialOpen(sio_fd_t fd, void (*linkStatusCB)(void *ctx, int errCode, void *arg), void *linkStatusCtx);
386
387/*
388 * Open a new PPP Over Ethernet (PPPOE) connection.
389 */
390int pppOverEthernetOpen(struct netif *ethif, const char *service_name, const char *concentrator_name, void (*linkStatusCB)(void *ctx, int errCode, void *arg), void *linkStatusCtx);
391
392/* for source code compatibility */
393#define pppOpen(fd,cb,ls) pppOverSerialOpen(fd,cb,ls)
394
395/*
396 * Close a PPP connection and release the descriptor.
397 * Any outstanding packets in the queues are dropped.
398 * Return 0 on success, an error code on failure.
399 */
400int pppClose(int pd);
401
402/*
403 * Indicate to the PPP process that the line has disconnected.
404 */
405void pppSigHUP(int pd);
406
407/*
408 * Get and set parameters for the given connection.
409 * Return 0 on success, an error code on failure.
410 */
411int pppIOCtl(int pd, int cmd, void *arg);
412
413/*
414 * Return the Maximum Transmission Unit for the given PPP connection.
415 */
416u_int pppMTU(int pd);
417
418/*
419 * Write n characters to a ppp link.
420 * RETURN: >= 0 Number of characters written, -1 Failed to write to device.
421 */
422int pppWrite(int pd, const u_char *s, int n);
423
424void pppInProcOverEthernet(int pd, struct pbuf *pb);
425
426struct pbuf *pppSingleBuf(struct pbuf *p);
427
428void pppLinkTerminated(int pd);
429
430void pppLinkDown(int pd);
431
432void pppMainWakeup(int pd);
433
434/* Configure i/f transmit parameters */
435void ppp_send_config (int, int, u32_t, int, int);
436/* Set extended transmit ACCM */
437void ppp_set_xaccm (int, ext_accm *);
438/* Configure i/f receive parameters */
439void ppp_recv_config (int, int, u32_t, int, int);
440/* Find out how long link has been idle */
441int get_idle_time (int, struct ppp_idle *);
442
443/* Configure VJ TCP header compression */
444int sifvjcomp (int, int, int, int);
445/* Configure i/f down (for IP) */
446int sifup (int);
447/* Set mode for handling packets for proto */
448int sifnpmode (int u, int proto, enum NPmode mode);
449/* Configure i/f down (for IP) */
450int sifdown (int);
451/* Configure IP addresses for i/f */
452int sifaddr (int, u32_t, u32_t, u32_t, u32_t, u32_t);
453/* Reset i/f IP addresses */
454int cifaddr (int, u32_t, u32_t);
455/* Create default route through i/f */
456int sifdefaultroute (int, u32_t, u32_t);
457/* Delete default route through i/f */
458int cifdefaultroute (int, u32_t, u32_t);
459
460/* Get appropriate netmask for address */
461u32_t GetMask (u32_t);
462
463#endif /* PPP_SUPPORT */
464
465#endif /* PPP_H */
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