Centralize if queue handling.
[dragonfly.git] / sys / net / sppp / if_spppsubr.c
1 /*
2  * Synchronous PPP/Cisco link level subroutines.
3  * Keepalive protocol implemented in both Cisco and PPP modes.
4  *
5  * Copyright (C) 1994-1996 Cronyx Engineering Ltd.
6  * Author: Serge Vakulenko, <vak@cronyx.ru>
7  *
8  * Heavily revamped to conform to RFC 1661.
9  * Copyright (C) 1997, 2001 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 organisations 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 2.4, Thu Apr 30 17:17:21 MSD 1997
19  *
20  * $FreeBSD: src/sys/net/if_spppsubr.c,v 1.59.2.13 2002/07/03 15:44:41 joerg Exp $
21  * $DragonFly: src/sys/net/sppp/if_spppsubr.c,v 1.5 2003/09/15 23:38:14 hsu Exp $
22  */
23
24 #include <sys/param.h>
25
26 #if defined(__FreeBSD__) && __FreeBSD__ >= 3
27 #include "opt_inet.h"
28 #include "opt_inet6.h"
29 #include "opt_ipx.h"
30 #endif
31
32 #ifdef NetBSD1_3
33 #  if NetBSD1_3 > 6
34 #      include "opt_inet.h"
35 #      include "opt_inet6.h"
36 #      include "opt_iso.h"
37 #  endif
38 #endif
39
40 #include <sys/systm.h>
41 #include <sys/kernel.h>
42 #include <sys/module.h>
43 #include <sys/sockio.h>
44 #include <sys/socket.h>
45 #include <sys/syslog.h>
46 #if defined(__FreeBSD__) && __FreeBSD__ >= 3
47 #include <sys/random.h>
48 #endif
49 #include <sys/malloc.h>
50 #include <sys/mbuf.h>
51
52 #if defined (__OpenBSD__)
53 #include <sys/md5k.h>
54 #else
55 #include <sys/md5.h>
56 #endif
57
58 #include <net/if.h>
59 #include <net/netisr.h>
60 #include <net/if_types.h>
61 #include <net/route.h>
62 #include <netinet/in.h>
63 #include <netinet/in_systm.h>
64 #include <netinet/ip.h>
65 #include <net/slcompress.h>
66
67 #if defined (__NetBSD__) || defined (__OpenBSD__)
68 #include <machine/cpu.h> /* XXX for softnet */
69 #endif
70
71 #include <machine/stdarg.h>
72
73 #include <netinet/in.h>
74 #include <netinet/in_systm.h>
75 #include <netinet/in_var.h>
76
77 #ifdef INET
78 #include <netinet/ip.h>
79 #include <netinet/tcp.h>
80 #endif
81
82 #if defined (__FreeBSD__) || defined (__OpenBSD__)
83 # include <netinet/if_ether.h>
84 #else
85 # include <net/ethertypes.h>
86 #endif
87
88 #ifdef IPX
89 #include <netproto/ipx/ipx.h>
90 #include <netproto/ipx/ipx_if.h>
91 #endif
92
93 #ifdef NS
94 #include <netns/ns.h>
95 #include <netns/ns_if.h>
96 #endif
97
98 #include "if_sppp.h"
99
100 #if defined(__FreeBSD__) && __FreeBSD__ >= 3
101 # define UNTIMEOUT(fun, arg, handle) untimeout(fun, arg, handle)
102 # define TIMEOUT(fun, arg1, arg2, handle) handle = timeout(fun, arg1, arg2)
103 # define IOCTL_CMD_T    u_long
104 #else
105 # define UNTIMEOUT(fun, arg, handle) untimeout(fun, arg)
106 # define TIMEOUT(fun, arg1, arg2, handle) timeout(fun, arg1, arg2)
107 # define IOCTL_CMD_T    int
108 #endif
109
110 #define MAXALIVECNT     3               /* max. alive packets */
111
112 /*
113  * Interface flags that can be set in an ifconfig command.
114  *
115  * Setting link0 will make the link passive, i.e. it will be marked
116  * as being administrative openable, but won't be opened to begin
117  * with.  Incoming calls will be answered, or subsequent calls with
118  * -link1 will cause the administrative open of the LCP layer.
119  *
120  * Setting link1 will cause the link to auto-dial only as packets
121  * arrive to be sent.
122  *
123  * Setting IFF_DEBUG will syslog the option negotiation and state
124  * transitions at level kern.debug.  Note: all logs consistently look
125  * like
126  *
127  *   <if-name><unit>: <proto-name> <additional info...>
128  *
129  * with <if-name><unit> being something like "bppp0", and <proto-name>
130  * being one of "lcp", "ipcp", "cisco", "chap", "pap", etc.
131  */
132
133 #define IFF_PASSIVE     IFF_LINK0       /* wait passively for connection */
134 #define IFF_AUTO        IFF_LINK1       /* auto-dial on output */
135 #define IFF_CISCO       IFF_LINK2       /* auto-dial on output */
136
137 #define PPP_ALLSTATIONS 0xff            /* All-Stations broadcast address */
138 #define PPP_UI          0x03            /* Unnumbered Information */
139 #define PPP_IP          0x0021          /* Internet Protocol */
140 #define PPP_ISO         0x0023          /* ISO OSI Protocol */
141 #define PPP_XNS         0x0025          /* Xerox NS Protocol */
142 #define PPP_IPX         0x002b          /* Novell IPX Protocol */
143 #define PPP_VJ_COMP     0x002d          /* VJ compressed TCP/IP */
144 #define PPP_VJ_UCOMP    0x002f          /* VJ uncompressed TCP/IP */
145 #define PPP_IPV6        0x0057          /* Internet Protocol Version 6 */
146 #define PPP_LCP         0xc021          /* Link Control Protocol */
147 #define PPP_PAP         0xc023          /* Password Authentication Protocol */
148 #define PPP_CHAP        0xc223          /* Challenge-Handshake Auth Protocol */
149 #define PPP_IPCP        0x8021          /* Internet Protocol Control Protocol */
150 #define PPP_IPV6CP      0x8057          /* IPv6 Control Protocol */
151
152 #define CONF_REQ        1               /* PPP configure request */
153 #define CONF_ACK        2               /* PPP configure acknowledge */
154 #define CONF_NAK        3               /* PPP configure negative ack */
155 #define CONF_REJ        4               /* PPP configure reject */
156 #define TERM_REQ        5               /* PPP terminate request */
157 #define TERM_ACK        6               /* PPP terminate acknowledge */
158 #define CODE_REJ        7               /* PPP code reject */
159 #define PROTO_REJ       8               /* PPP protocol reject */
160 #define ECHO_REQ        9               /* PPP echo request */
161 #define ECHO_REPLY      10              /* PPP echo reply */
162 #define DISC_REQ        11              /* PPP discard request */
163
164 #define LCP_OPT_MRU             1       /* maximum receive unit */
165 #define LCP_OPT_ASYNC_MAP       2       /* async control character map */
166 #define LCP_OPT_AUTH_PROTO      3       /* authentication protocol */
167 #define LCP_OPT_QUAL_PROTO      4       /* quality protocol */
168 #define LCP_OPT_MAGIC           5       /* magic number */
169 #define LCP_OPT_RESERVED        6       /* reserved */
170 #define LCP_OPT_PROTO_COMP      7       /* protocol field compression */
171 #define LCP_OPT_ADDR_COMP       8       /* address/control field compression */
172
173 #define IPCP_OPT_ADDRESSES      1       /* both IP addresses; deprecated */
174 #define IPCP_OPT_COMPRESSION    2       /* IP compression protocol (VJ) */
175 #define IPCP_OPT_ADDRESS        3       /* local IP address */
176
177 #define IPV6CP_OPT_IFID 1       /* interface identifier */
178 #define IPV6CP_OPT_COMPRESSION  2       /* IPv6 compression protocol */
179
180 #define IPCP_COMP_VJ            0x2d    /* Code for VJ compression */
181
182 #define PAP_REQ                 1       /* PAP name/password request */
183 #define PAP_ACK                 2       /* PAP acknowledge */
184 #define PAP_NAK                 3       /* PAP fail */
185
186 #define CHAP_CHALLENGE          1       /* CHAP challenge request */
187 #define CHAP_RESPONSE           2       /* CHAP challenge response */
188 #define CHAP_SUCCESS            3       /* CHAP response ok */
189 #define CHAP_FAILURE            4       /* CHAP response failed */
190
191 #define CHAP_MD5                5       /* hash algorithm - MD5 */
192
193 #define CISCO_MULTICAST         0x8f    /* Cisco multicast address */
194 #define CISCO_UNICAST           0x0f    /* Cisco unicast address */
195 #define CISCO_KEEPALIVE         0x8035  /* Cisco keepalive protocol */
196 #define CISCO_ADDR_REQ          0       /* Cisco address request */
197 #define CISCO_ADDR_REPLY        1       /* Cisco address reply */
198 #define CISCO_KEEPALIVE_REQ     2       /* Cisco keepalive request */
199
200 /* states are named and numbered according to RFC 1661 */
201 #define STATE_INITIAL   0
202 #define STATE_STARTING  1
203 #define STATE_CLOSED    2
204 #define STATE_STOPPED   3
205 #define STATE_CLOSING   4
206 #define STATE_STOPPING  5
207 #define STATE_REQ_SENT  6
208 #define STATE_ACK_RCVD  7
209 #define STATE_ACK_SENT  8
210 #define STATE_OPENED    9
211
212 struct ppp_header {
213         u_char address;
214         u_char control;
215         u_short protocol;
216 } __attribute__((__packed__));
217 #define PPP_HEADER_LEN          sizeof (struct ppp_header)
218
219 struct lcp_header {
220         u_char type;
221         u_char ident;
222         u_short len;
223 } __attribute__((__packed__));
224 #define LCP_HEADER_LEN          sizeof (struct lcp_header)
225
226 struct cisco_packet {
227         u_long type;
228         u_long par1;
229         u_long par2;
230         u_short rel;
231         u_short time0;
232         u_short time1;
233 } __attribute__((__packed__));
234 #define CISCO_PACKET_LEN        sizeof (struct cisco_packet)
235
236 /*
237  * We follow the spelling and capitalization of RFC 1661 here, to make
238  * it easier comparing with the standard.  Please refer to this RFC in
239  * case you can't make sense out of these abbreviation; it will also
240  * explain the semantics related to the various events and actions.
241  */
242 struct cp {
243         u_short proto;          /* PPP control protocol number */
244         u_char protoidx;        /* index into state table in struct sppp */
245         u_char flags;
246 #define CP_LCP          0x01    /* this is the LCP */
247 #define CP_AUTH         0x02    /* this is an authentication protocol */
248 #define CP_NCP          0x04    /* this is a NCP */
249 #define CP_QUAL         0x08    /* this is a quality reporting protocol */
250         const char *name;       /* name of this control protocol */
251         /* event handlers */
252         void    (*Up)(struct sppp *sp);
253         void    (*Down)(struct sppp *sp);
254         void    (*Open)(struct sppp *sp);
255         void    (*Close)(struct sppp *sp);
256         void    (*TO)(void *sp);
257         int     (*RCR)(struct sppp *sp, struct lcp_header *h, int len);
258         void    (*RCN_rej)(struct sppp *sp, struct lcp_header *h, int len);
259         void    (*RCN_nak)(struct sppp *sp, struct lcp_header *h, int len);
260         /* actions */
261         void    (*tlu)(struct sppp *sp);
262         void    (*tld)(struct sppp *sp);
263         void    (*tls)(struct sppp *sp);
264         void    (*tlf)(struct sppp *sp);
265         void    (*scr)(struct sppp *sp);
266 };
267
268 static struct sppp *spppq;
269 #if defined(__FreeBSD__) && __FreeBSD__ >= 3
270 static struct callout_handle keepalive_ch;
271 #endif
272
273 #if defined(__FreeBSD__) && __FreeBSD__ >= 3
274 #define SPP_FMT         "%s%d: "
275 #define SPP_ARGS(ifp)   (ifp)->if_name, (ifp)->if_unit
276 #else
277 #define SPP_FMT         "%s: "
278 #define SPP_ARGS(ifp)   (ifp)->if_xname
279 #endif
280
281 #ifdef INET
282 /*
283  * The following disgusting hack gets around the problem that IP TOS
284  * can't be set yet.  We want to put "interactive" traffic on a high
285  * priority queue.  To decide if traffic is interactive, we check that
286  * a) it is TCP and b) one of its ports is telnet, rlogin or ftp control.
287  *
288  * XXX is this really still necessary?  - joerg -
289  */
290 static u_short interactive_ports[8] = {
291         0,      513,    0,      0,
292         0,      21,     0,      23,
293 };
294 #define INTERACTIVE(p) (interactive_ports[(p) & 7] == (p))
295 #endif
296
297 /* almost every function needs these */
298 #define STDDCL                                                  \
299         struct ifnet *ifp = &sp->pp_if;                         \
300         int debug = ifp->if_flags & IFF_DEBUG
301
302 static int sppp_output(struct ifnet *ifp, struct mbuf *m,
303                        struct sockaddr *dst, struct rtentry *rt);
304
305 static void sppp_cisco_send(struct sppp *sp, int type, long par1, long par2);
306 static void sppp_cisco_input(struct sppp *sp, struct mbuf *m);
307
308 static void sppp_cp_input(const struct cp *cp, struct sppp *sp,
309                           struct mbuf *m);
310 static void sppp_cp_send(struct sppp *sp, u_short proto, u_char type,
311                          u_char ident, u_short len, void *data);
312 /* static void sppp_cp_timeout(void *arg); */
313 static void sppp_cp_change_state(const struct cp *cp, struct sppp *sp,
314                                  int newstate);
315 static void sppp_auth_send(const struct cp *cp,
316                            struct sppp *sp, unsigned int type, unsigned int id,
317                            ...);
318
319 static void sppp_up_event(const struct cp *cp, struct sppp *sp);
320 static void sppp_down_event(const struct cp *cp, struct sppp *sp);
321 static void sppp_open_event(const struct cp *cp, struct sppp *sp);
322 static void sppp_close_event(const struct cp *cp, struct sppp *sp);
323 static void sppp_to_event(const struct cp *cp, struct sppp *sp);
324
325 static void sppp_null(struct sppp *sp);
326
327 static void sppp_lcp_init(struct sppp *sp);
328 static void sppp_lcp_up(struct sppp *sp);
329 static void sppp_lcp_down(struct sppp *sp);
330 static void sppp_lcp_open(struct sppp *sp);
331 static void sppp_lcp_close(struct sppp *sp);
332 static void sppp_lcp_TO(void *sp);
333 static int sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len);
334 static void sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len);
335 static void sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len);
336 static void sppp_lcp_tlu(struct sppp *sp);
337 static void sppp_lcp_tld(struct sppp *sp);
338 static void sppp_lcp_tls(struct sppp *sp);
339 static void sppp_lcp_tlf(struct sppp *sp);
340 static void sppp_lcp_scr(struct sppp *sp);
341 static void sppp_lcp_check_and_close(struct sppp *sp);
342 static int sppp_ncp_check(struct sppp *sp);
343
344 static void sppp_ipcp_init(struct sppp *sp);
345 static void sppp_ipcp_up(struct sppp *sp);
346 static void sppp_ipcp_down(struct sppp *sp);
347 static void sppp_ipcp_open(struct sppp *sp);
348 static void sppp_ipcp_close(struct sppp *sp);
349 static void sppp_ipcp_TO(void *sp);
350 static int sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len);
351 static void sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len);
352 static void sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len);
353 static void sppp_ipcp_tlu(struct sppp *sp);
354 static void sppp_ipcp_tld(struct sppp *sp);
355 static void sppp_ipcp_tls(struct sppp *sp);
356 static void sppp_ipcp_tlf(struct sppp *sp);
357 static void sppp_ipcp_scr(struct sppp *sp);
358
359 static void sppp_ipv6cp_init(struct sppp *sp);
360 static void sppp_ipv6cp_up(struct sppp *sp);
361 static void sppp_ipv6cp_down(struct sppp *sp);
362 static void sppp_ipv6cp_open(struct sppp *sp);
363 static void sppp_ipv6cp_close(struct sppp *sp);
364 static void sppp_ipv6cp_TO(void *sp);
365 static int sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len);
366 static void sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len);
367 static void sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len);
368 static void sppp_ipv6cp_tlu(struct sppp *sp);
369 static void sppp_ipv6cp_tld(struct sppp *sp);
370 static void sppp_ipv6cp_tls(struct sppp *sp);
371 static void sppp_ipv6cp_tlf(struct sppp *sp);
372 static void sppp_ipv6cp_scr(struct sppp *sp);
373
374 static void sppp_pap_input(struct sppp *sp, struct mbuf *m);
375 static void sppp_pap_init(struct sppp *sp);
376 static void sppp_pap_open(struct sppp *sp);
377 static void sppp_pap_close(struct sppp *sp);
378 static void sppp_pap_TO(void *sp);
379 static void sppp_pap_my_TO(void *sp);
380 static void sppp_pap_tlu(struct sppp *sp);
381 static void sppp_pap_tld(struct sppp *sp);
382 static void sppp_pap_scr(struct sppp *sp);
383
384 static void sppp_chap_input(struct sppp *sp, struct mbuf *m);
385 static void sppp_chap_init(struct sppp *sp);
386 static void sppp_chap_open(struct sppp *sp);
387 static void sppp_chap_close(struct sppp *sp);
388 static void sppp_chap_TO(void *sp);
389 static void sppp_chap_tlu(struct sppp *sp);
390 static void sppp_chap_tld(struct sppp *sp);
391 static void sppp_chap_scr(struct sppp *sp);
392
393 static const char *sppp_auth_type_name(u_short proto, u_char type);
394 static const char *sppp_cp_type_name(u_char type);
395 static const char *sppp_dotted_quad(u_long addr);
396 static const char *sppp_ipcp_opt_name(u_char opt);
397 #ifdef INET6
398 static const char *sppp_ipv6cp_opt_name(u_char opt);
399 #endif
400 static const char *sppp_lcp_opt_name(u_char opt);
401 static const char *sppp_phase_name(enum ppp_phase phase);
402 static const char *sppp_proto_name(u_short proto);
403 static const char *sppp_state_name(int state);
404 static int sppp_params(struct sppp *sp, u_long cmd, void *data);
405 static int sppp_strnlen(u_char *p, int max);
406 static void sppp_get_ip_addrs(struct sppp *sp, u_long *src, u_long *dst,
407                               u_long *srcmask);
408 static void sppp_keepalive(void *dummy);
409 static void sppp_phase_network(struct sppp *sp);
410 static void sppp_print_bytes(const u_char *p, u_short len);
411 static void sppp_print_string(const char *p, u_short len);
412 static void sppp_qflush(struct ifqueue *ifq);
413 static void sppp_set_ip_addr(struct sppp *sp, u_long src);
414 #ifdef INET6
415 static void sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src,
416                                struct in6_addr *dst, struct in6_addr *srcmask);
417 #ifdef IPV6CP_MYIFID_DYN
418 static void sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src);
419 static void sppp_gen_ip6_addr(struct sppp *sp, const struct in6_addr *src);
420 #endif
421 static void sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *src);
422 #endif
423
424 /* our control protocol descriptors */
425 static const struct cp lcp = {
426         PPP_LCP, IDX_LCP, CP_LCP, "lcp",
427         sppp_lcp_up, sppp_lcp_down, sppp_lcp_open, sppp_lcp_close,
428         sppp_lcp_TO, sppp_lcp_RCR, sppp_lcp_RCN_rej, sppp_lcp_RCN_nak,
429         sppp_lcp_tlu, sppp_lcp_tld, sppp_lcp_tls, sppp_lcp_tlf,
430         sppp_lcp_scr
431 };
432
433 static const struct cp ipcp = {
434         PPP_IPCP, IDX_IPCP, CP_NCP, "ipcp",
435         sppp_ipcp_up, sppp_ipcp_down, sppp_ipcp_open, sppp_ipcp_close,
436         sppp_ipcp_TO, sppp_ipcp_RCR, sppp_ipcp_RCN_rej, sppp_ipcp_RCN_nak,
437         sppp_ipcp_tlu, sppp_ipcp_tld, sppp_ipcp_tls, sppp_ipcp_tlf,
438         sppp_ipcp_scr
439 };
440
441 static const struct cp ipv6cp = {
442         PPP_IPV6CP, IDX_IPV6CP,
443 #ifdef INET6    /*don't run IPv6CP if there's no IPv6 support*/
444         CP_NCP,
445 #else
446         0,
447 #endif
448         "ipv6cp",
449         sppp_ipv6cp_up, sppp_ipv6cp_down, sppp_ipv6cp_open, sppp_ipv6cp_close,
450         sppp_ipv6cp_TO, sppp_ipv6cp_RCR, sppp_ipv6cp_RCN_rej, sppp_ipv6cp_RCN_nak,
451         sppp_ipv6cp_tlu, sppp_ipv6cp_tld, sppp_ipv6cp_tls, sppp_ipv6cp_tlf,
452         sppp_ipv6cp_scr
453 };
454
455 static const struct cp pap = {
456         PPP_PAP, IDX_PAP, CP_AUTH, "pap",
457         sppp_null, sppp_null, sppp_pap_open, sppp_pap_close,
458         sppp_pap_TO, 0, 0, 0,
459         sppp_pap_tlu, sppp_pap_tld, sppp_null, sppp_null,
460         sppp_pap_scr
461 };
462
463 static const struct cp chap = {
464         PPP_CHAP, IDX_CHAP, CP_AUTH, "chap",
465         sppp_null, sppp_null, sppp_chap_open, sppp_chap_close,
466         sppp_chap_TO, 0, 0, 0,
467         sppp_chap_tlu, sppp_chap_tld, sppp_null, sppp_null,
468         sppp_chap_scr
469 };
470
471 static const struct cp *cps[IDX_COUNT] = {
472         &lcp,                   /* IDX_LCP */
473         &ipcp,                  /* IDX_IPCP */
474         &ipv6cp,                /* IDX_IPV6CP */
475         &pap,                   /* IDX_PAP */
476         &chap,                  /* IDX_CHAP */
477 };
478
479 static int
480 sppp_modevent(module_t mod, int type, void *unused)
481 {
482         switch (type) {
483         case MOD_LOAD:
484                 break;
485         case MOD_UNLOAD:
486                 return EACCES;
487                 break;
488         default:
489                 break;
490         }
491         return 0;
492 }
493 static moduledata_t spppmod = {
494         "sppp",
495         sppp_modevent,
496         0
497 };
498 MODULE_VERSION(sppp, 1);
499 DECLARE_MODULE(sppp, spppmod, SI_SUB_DRIVERS, SI_ORDER_ANY);
500
501 /*
502  * Exported functions, comprising our interface to the lower layer.
503  */
504
505 /*
506  * Process the received packet.
507  */
508 void
509 sppp_input(struct ifnet *ifp, struct mbuf *m)
510 {
511         struct ppp_header *h;
512         int isr = -1;
513         struct sppp *sp = (struct sppp *)ifp;
514         u_char *iphdr;
515         int hlen, vjlen, do_account = 0;
516         int debug = ifp->if_flags & IFF_DEBUG;
517
518         if (ifp->if_flags & IFF_UP)
519                 /* Count received bytes, add FCS and one flag */
520                 ifp->if_ibytes += m->m_pkthdr.len + 3;
521
522         if (m->m_pkthdr.len <= PPP_HEADER_LEN) {
523                 /* Too small packet, drop it. */
524                 if (debug)
525                         log(LOG_DEBUG,
526                             SPP_FMT "input packet is too small, %d bytes\n",
527                             SPP_ARGS(ifp), m->m_pkthdr.len);
528           drop:
529                 m_freem (m);
530           drop2:
531                 ++ifp->if_ierrors;
532                 ++ifp->if_iqdrops;
533                 return;
534         }
535
536         /* Get PPP header. */
537         h = mtod (m, struct ppp_header*);
538         m_adj (m, PPP_HEADER_LEN);
539
540         switch (h->address) {
541         case PPP_ALLSTATIONS:
542                 if (h->control != PPP_UI)
543                         goto invalid;
544                 if (sp->pp_mode == IFF_CISCO) {
545                         if (debug)
546                                 log(LOG_DEBUG,
547                                     SPP_FMT "PPP packet in Cisco mode "
548                                     "<addr=0x%x ctrl=0x%x proto=0x%x>\n",
549                                     SPP_ARGS(ifp),
550                                     h->address, h->control, ntohs(h->protocol));
551                         goto drop;
552                 }
553                 switch (ntohs (h->protocol)) {
554                 default:
555                         if (debug)
556                                 log(LOG_DEBUG,
557                                     SPP_FMT "rejecting protocol "
558                                     "<addr=0x%x ctrl=0x%x proto=0x%x>\n",
559                                     SPP_ARGS(ifp),
560                                     h->address, h->control, ntohs(h->protocol));
561                         if (sp->state[IDX_LCP] == STATE_OPENED)
562                                 sppp_cp_send (sp, PPP_LCP, PROTO_REJ,
563                                         ++sp->pp_seq[IDX_LCP], m->m_pkthdr.len + 2,
564                                         &h->protocol);
565                         ++ifp->if_noproto;
566                         goto drop;
567                 case PPP_LCP:
568                         sppp_cp_input(&lcp, sp, m);
569                         m_freem (m);
570                         return;
571                 case PPP_PAP:
572                         if (sp->pp_phase >= PHASE_AUTHENTICATE)
573                                 sppp_pap_input(sp, m);
574                         m_freem (m);
575                         return;
576                 case PPP_CHAP:
577                         if (sp->pp_phase >= PHASE_AUTHENTICATE)
578                                 sppp_chap_input(sp, m);
579                         m_freem (m);
580                         return;
581 #ifdef INET
582                 case PPP_IPCP:
583                         if (sp->pp_phase == PHASE_NETWORK)
584                                 sppp_cp_input(&ipcp, sp, m);
585                         m_freem (m);
586                         return;
587                 case PPP_IP:
588                         if (sp->state[IDX_IPCP] == STATE_OPENED) {
589                                 isr = NETISR_IP;
590                         }
591                         do_account++;
592                         break;
593                 case PPP_VJ_COMP:
594                         if (sp->state[IDX_IPCP] == STATE_OPENED) {
595                                 if ((vjlen =
596                                      sl_uncompress_tcp_core(mtod(m, u_char *),
597                                                             m->m_len, m->m_len,
598                                                             TYPE_COMPRESSED_TCP,
599                                                             sp->pp_comp,
600                                                             &iphdr, &hlen)) <= 0) {
601                                         if (debug)
602                                                 log(LOG_INFO,
603                             SPP_FMT "VJ uncompress failed on compressed packet\n",
604                                                     SPP_ARGS(ifp));
605                                         goto drop;
606                                 }
607
608                                 /*
609                                  * Trim the VJ header off the packet, and prepend
610                                  * the uncompressed IP header (which will usually
611                                  * end up in two chained mbufs since there's not
612                                  * enough leading space in the existing mbuf).
613                                  */
614                                 m_adj(m, vjlen);
615                                 M_PREPEND(m, hlen, M_DONTWAIT);
616                                 if (m == NULL)
617                                         goto drop2;
618                                 bcopy(iphdr, mtod(m, u_char *), hlen);
619
620                                 isr = NETISR_IP;
621                         }
622                         do_account++;
623                         break;
624                 case PPP_VJ_UCOMP:
625                         if (sp->state[IDX_IPCP] == STATE_OPENED) {
626                                 if (sl_uncompress_tcp_core(mtod(m, u_char *),
627                                                            m->m_len, m->m_len,
628                                                            TYPE_UNCOMPRESSED_TCP,
629                                                            sp->pp_comp,
630                                                            &iphdr, &hlen) != 0) {
631                                         if (debug)
632                                                 log(LOG_INFO,
633                             SPP_FMT "VJ uncompress failed on uncompressed packet\n",
634                                                     SPP_ARGS(ifp));
635                                         goto drop;
636                                 }
637                                 isr = NETISR_IP;
638                         }
639                         do_account++;
640                         break;
641 #endif
642 #ifdef INET6
643                 case PPP_IPV6CP:
644                         if (sp->pp_phase == PHASE_NETWORK)
645                             sppp_cp_input(&ipv6cp, sp, m);
646                         m_freem (m);
647                         return;
648
649                 case PPP_IPV6:
650                         if (sp->state[IDX_IPV6CP] == STATE_OPENED) {
651                                 isr = NETISR_IPV6;
652                         }
653                         do_account++;
654                         break;
655 #endif
656 #ifdef IPX
657                 case PPP_IPX:
658                         /* IPX IPXCP not implemented yet */
659                         if (sp->pp_phase == PHASE_NETWORK) {
660                                 isr = NETISR_IPX;
661                         }
662                         do_account++;
663                         break;
664 #endif
665 #ifdef NS
666                 case PPP_XNS:
667                         /* XNS IDPCP not implemented yet */
668                         if (sp->pp_phase == PHASE_NETWORK) {
669                                 isr = NETISR_NS;
670                         }
671                         do_account++;
672                         break;
673 #endif
674                 }
675                 break;
676         case CISCO_MULTICAST:
677         case CISCO_UNICAST:
678                 /* Don't check the control field here (RFC 1547). */
679                 if (sp->pp_mode != IFF_CISCO) {
680                         if (debug)
681                                 log(LOG_DEBUG,
682                                     SPP_FMT "Cisco packet in PPP mode "
683                                     "<addr=0x%x ctrl=0x%x proto=0x%x>\n",
684                                     SPP_ARGS(ifp),
685                                     h->address, h->control, ntohs(h->protocol));
686                         goto drop;
687                 }
688                 switch (ntohs (h->protocol)) {
689                 default:
690                         ++ifp->if_noproto;
691                         goto invalid;
692                 case CISCO_KEEPALIVE:
693                         sppp_cisco_input ((struct sppp*) ifp, m);
694                         m_freem (m);
695                         return;
696 #ifdef INET
697                 case ETHERTYPE_IP:
698                         isr = NETISR_IP;
699                         do_account++;
700                         break;
701 #endif
702 #ifdef INET6
703                 case ETHERTYPE_IPV6:
704                         isr = NETISR_IPV6;
705                         do_account++;
706                         break;
707 #endif
708 #ifdef IPX
709                 case ETHERTYPE_IPX:
710                         isr = NETISR_IPX;
711                         do_account++;
712                         break;
713 #endif
714 #ifdef NS
715                 case ETHERTYPE_NS:
716                         isr = NETISR_NS
717                         do_account++;
718                         break;
719 #endif
720                 }
721                 break;
722         default:        /* Invalid PPP packet. */
723           invalid:
724                 if (debug)
725                         log(LOG_DEBUG,
726                             SPP_FMT "invalid input packet "
727                             "<addr=0x%x ctrl=0x%x proto=0x%x>\n",
728                             SPP_ARGS(ifp),
729                             h->address, h->control, ntohs(h->protocol));
730                 goto drop;
731         }
732
733         if (! (ifp->if_flags & IFF_UP) || isr < 0)
734                 goto drop;
735
736         /* Check queue. */
737
738         netisr_dispatch(isr, m);
739         if (do_account)
740                 /*
741                  * Do only account for network packets, not for control
742                  * packets.  This is used by some subsystems to detect
743                  * idle lines.
744                  */
745                 sp->pp_last_recv = time_second;
746 }
747
748 /*
749  * Enqueue transmit packet.
750  */
751 static int
752 sppp_output(struct ifnet *ifp, struct mbuf *m,
753             struct sockaddr *dst, struct rtentry *rt)
754 {
755         struct sppp *sp = (struct sppp*) ifp;
756         struct ppp_header *h;
757         struct ifqueue *ifq = NULL;
758         int s, rv = 0;
759         int ipproto = PPP_IP;
760         int debug = ifp->if_flags & IFF_DEBUG;
761
762         s = splimp();
763
764         if ((ifp->if_flags & IFF_UP) == 0 ||
765             (ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == 0) {
766 #ifdef INET6
767           drop:
768 #endif
769                 m_freem (m);
770                 splx (s);
771                 return (ENETDOWN);
772         }
773
774         if ((ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == IFF_AUTO) {
775 #ifdef INET6
776                 /*
777                  * XXX
778                  *
779                  * Hack to prevent the initialization-time generated
780                  * IPv6 multicast packet to erroneously cause a
781                  * dialout event in case IPv6 has been
782                  * administratively disabled on that interface.
783                  */
784                 if (dst->sa_family == AF_INET6 &&
785                     !(sp->confflags & CONF_ENABLE_IPV6))
786                         goto drop;
787 #endif
788                 /*
789                  * Interface is not yet running, but auto-dial.  Need
790                  * to start LCP for it.
791                  */
792                 ifp->if_flags |= IFF_RUNNING;
793                 splx(s);
794                 lcp.Open(sp);
795                 s = splimp();
796         }
797
798         ifq = &ifp->if_snd;
799 #ifdef INET
800         if (dst->sa_family == AF_INET) {
801                 /* XXX Check mbuf length here? */
802                 struct ip *ip = mtod (m, struct ip*);
803                 struct tcphdr *tcp = (struct tcphdr*) ((long*)ip + ip->ip_hl);
804
805                 /*
806                  * When using dynamic local IP address assignment by using
807                  * 0.0.0.0 as a local address, the first TCP session will
808                  * not connect because the local TCP checksum is computed
809                  * using 0.0.0.0 which will later become our real IP address
810                  * so the TCP checksum computed at the remote end will
811                  * become invalid. So we
812                  * - don't let packets with src ip addr 0 thru
813                  * - we flag TCP packets with src ip 0 as an error
814                  */
815
816                 if(ip->ip_src.s_addr == INADDR_ANY)     /* -hm */
817                 {
818                         m_freem(m);
819                         splx(s);
820                         if(ip->ip_p == IPPROTO_TCP)
821                                 return(EADDRNOTAVAIL);
822                         else
823                                 return(0);
824                 }
825
826                 /*
827                  * Put low delay, telnet, rlogin and ftp control packets
828                  * in front of the queue.
829                  */
830                 if (IF_QFULL (&sp->pp_fastq))
831                         ;
832                 else if (ip->ip_tos & IPTOS_LOWDELAY)
833                         ifq = &sp->pp_fastq;
834                 else if (m->m_len < sizeof *ip + sizeof *tcp)
835                         ;
836                 else if (ip->ip_p != IPPROTO_TCP)
837                         ;
838                 else if (INTERACTIVE (ntohs (tcp->th_sport)))
839                         ifq = &sp->pp_fastq;
840                 else if (INTERACTIVE (ntohs (tcp->th_dport)))
841                         ifq = &sp->pp_fastq;
842
843                 /*
844                  * Do IP Header compression
845                  */
846                 if (sp->pp_mode != IFF_CISCO && (sp->ipcp.flags & IPCP_VJ) &&
847                     ip->ip_p == IPPROTO_TCP)
848                         switch (sl_compress_tcp(m, ip, sp->pp_comp,
849                                                 sp->ipcp.compress_cid)) {
850                         case TYPE_COMPRESSED_TCP:
851                                 ipproto = PPP_VJ_COMP;
852                                 break;
853                         case TYPE_UNCOMPRESSED_TCP:
854                                 ipproto = PPP_VJ_UCOMP;
855                                 break;
856                         case TYPE_IP:
857                                 ipproto = PPP_IP;
858                                 break;
859                         default:
860                                 m_freem(m);
861                                 splx(s);
862                                 return (EINVAL);
863                         }
864         }
865 #endif
866
867 #ifdef INET6
868         if (dst->sa_family == AF_INET6) {
869                 /* XXX do something tricky here? */
870         }
871 #endif
872
873         /*
874          * Prepend general data packet PPP header. For now, IP only.
875          */
876         M_PREPEND (m, PPP_HEADER_LEN, M_DONTWAIT);
877         if (! m) {
878                 if (debug)
879                         log(LOG_DEBUG, SPP_FMT "no memory for transmit header\n",
880                                 SPP_ARGS(ifp));
881                 ++ifp->if_oerrors;
882                 splx (s);
883                 return (ENOBUFS);
884         }
885         /*
886          * May want to check size of packet
887          * (albeit due to the implementation it's always enough)
888          */
889         h = mtod (m, struct ppp_header*);
890         if (sp->pp_mode == IFF_CISCO) {
891                 h->address = CISCO_UNICAST;        /* unicast address */
892                 h->control = 0;
893         } else {
894                 h->address = PPP_ALLSTATIONS;        /* broadcast address */
895                 h->control = PPP_UI;                 /* Unnumbered Info */
896         }
897
898         switch (dst->sa_family) {
899 #ifdef INET
900         case AF_INET:   /* Internet Protocol */
901                 if (sp->pp_mode == IFF_CISCO)
902                         h->protocol = htons (ETHERTYPE_IP);
903                 else {
904                         /*
905                          * Don't choke with an ENETDOWN early.  It's
906                          * possible that we just started dialing out,
907                          * so don't drop the packet immediately.  If
908                          * we notice that we run out of buffer space
909                          * below, we will however remember that we are
910                          * not ready to carry IP packets, and return
911                          * ENETDOWN, as opposed to ENOBUFS.
912                          */
913                         h->protocol = htons(ipproto);
914                         if (sp->state[IDX_IPCP] != STATE_OPENED)
915                                 rv = ENETDOWN;
916                 }
917                 break;
918 #endif
919 #ifdef INET6
920         case AF_INET6:   /* Internet Protocol */
921                 if (sp->pp_mode == IFF_CISCO)
922                         h->protocol = htons (ETHERTYPE_IPV6);
923                 else {
924                         /*
925                          * Don't choke with an ENETDOWN early.  It's
926                          * possible that we just started dialing out,
927                          * so don't drop the packet immediately.  If
928                          * we notice that we run out of buffer space
929                          * below, we will however remember that we are
930                          * not ready to carry IP packets, and return
931                          * ENETDOWN, as opposed to ENOBUFS.
932                          */
933                         h->protocol = htons(PPP_IPV6);
934                         if (sp->state[IDX_IPV6CP] != STATE_OPENED)
935                                 rv = ENETDOWN;
936                 }
937                 break;
938 #endif
939 #ifdef NS
940         case AF_NS:     /* Xerox NS Protocol */
941                 h->protocol = htons (sp->pp_mode == IFF_CISCO ?
942                         ETHERTYPE_NS : PPP_XNS);
943                 break;
944 #endif
945 #ifdef IPX
946         case AF_IPX:     /* Novell IPX Protocol */
947                 h->protocol = htons (sp->pp_mode == IFF_CISCO ?
948                         ETHERTYPE_IPX : PPP_IPX);
949                 break;
950 #endif
951         default:
952                 m_freem (m);
953                 ++ifp->if_oerrors;
954                 splx (s);
955                 return (EAFNOSUPPORT);
956         }
957
958         /*
959          * Queue message on interface, and start output if interface
960          * not yet active.
961          */
962         if (IF_QFULL (ifq)) {
963                 IF_DROP (&ifp->if_snd);
964                 m_freem (m);
965                 ++ifp->if_oerrors;
966                 splx (s);
967                 return (rv? rv: ENOBUFS);
968         }
969         IF_ENQUEUE (ifq, m);
970         if (! (ifp->if_flags & IFF_OACTIVE))
971                 (*ifp->if_start) (ifp);
972
973         /*
974          * Count output packets and bytes.
975          * The packet length includes header, FCS and 1 flag,
976          * according to RFC 1333.
977          */
978         ifp->if_obytes += m->m_pkthdr.len + 3;
979         splx (s);
980         /*
981          * Unlike in sppp_input(), we can always bump the timestamp
982          * here since sppp_output() is only called on behalf of
983          * network-layer traffic; control-layer traffic is handled
984          * by sppp_cp_send().
985          */
986         sp->pp_last_sent = time_second;
987         return (0);
988 }
989
990 void
991 sppp_attach(struct ifnet *ifp)
992 {
993         struct sppp *sp = (struct sppp*) ifp;
994
995         /* Initialize keepalive handler. */
996         if (! spppq)
997                 TIMEOUT(sppp_keepalive, 0, hz * 10, keepalive_ch);
998
999         /* Insert new entry into the keepalive list. */
1000         sp->pp_next = spppq;
1001         spppq = sp;
1002
1003         sp->pp_if.if_mtu = PP_MTU;
1004         sp->pp_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST;
1005         sp->pp_if.if_type = IFT_PPP;
1006         sp->pp_if.if_output = sppp_output;
1007 #if 0
1008         sp->pp_flags = PP_KEEPALIVE;
1009 #endif
1010         sp->pp_if.if_snd.ifq_maxlen = 32;
1011         sp->pp_fastq.ifq_maxlen = 32;
1012         sp->pp_cpq.ifq_maxlen = 20;
1013         sp->pp_loopcnt = 0;
1014         sp->pp_alivecnt = 0;
1015         bzero(&sp->pp_seq[0], sizeof(sp->pp_seq));
1016         bzero(&sp->pp_rseq[0], sizeof(sp->pp_rseq));
1017         sp->pp_phase = PHASE_DEAD;
1018         sp->pp_up = lcp.Up;
1019         sp->pp_down = lcp.Down;
1020         sp->pp_last_recv = sp->pp_last_sent = time_second;
1021         sp->confflags = 0;
1022 #ifdef INET
1023         sp->confflags |= CONF_ENABLE_VJ;
1024 #endif
1025 #ifdef INET6
1026         sp->confflags |= CONF_ENABLE_IPV6;
1027 #endif
1028         sp->pp_comp = malloc(sizeof(struct slcompress), M_TEMP, M_WAIT);
1029         sl_compress_init(sp->pp_comp, -1);
1030         sppp_lcp_init(sp);
1031         sppp_ipcp_init(sp);
1032         sppp_ipv6cp_init(sp);
1033         sppp_pap_init(sp);
1034         sppp_chap_init(sp);
1035 }
1036
1037 void
1038 sppp_detach(struct ifnet *ifp)
1039 {
1040         struct sppp **q, *p, *sp = (struct sppp*) ifp;
1041         int i;
1042
1043         /* Remove the entry from the keepalive list. */
1044         for (q = &spppq; (p = *q); q = &p->pp_next)
1045                 if (p == sp) {
1046                         *q = p->pp_next;
1047                         break;
1048                 }
1049
1050         /* Stop keepalive handler. */
1051         if (! spppq)
1052                 UNTIMEOUT(sppp_keepalive, 0, keepalive_ch);
1053
1054         for (i = 0; i < IDX_COUNT; i++)
1055                 UNTIMEOUT((cps[i])->TO, (void *)sp, sp->ch[i]);
1056         UNTIMEOUT(sppp_pap_my_TO, (void *)sp, sp->pap_my_to_ch);
1057 }
1058
1059 /*
1060  * Flush the interface output queue.
1061  */
1062 void
1063 sppp_flush(struct ifnet *ifp)
1064 {
1065         struct sppp *sp = (struct sppp*) ifp;
1066
1067         sppp_qflush (&sp->pp_if.if_snd);
1068         sppp_qflush (&sp->pp_fastq);
1069         sppp_qflush (&sp->pp_cpq);
1070 }
1071
1072 /*
1073  * Check if the output queue is empty.
1074  */
1075 int
1076 sppp_isempty(struct ifnet *ifp)
1077 {
1078         struct sppp *sp = (struct sppp*) ifp;
1079         int empty, s;
1080
1081         s = splimp();
1082         empty = !sp->pp_fastq.ifq_head && !sp->pp_cpq.ifq_head &&
1083                 !sp->pp_if.if_snd.ifq_head;
1084         splx(s);
1085         return (empty);
1086 }
1087
1088 /*
1089  * Get next packet to send.
1090  */
1091 struct mbuf *
1092 sppp_dequeue(struct ifnet *ifp)
1093 {
1094         struct sppp *sp = (struct sppp*) ifp;
1095         struct mbuf *m;
1096         int s;
1097
1098         s = splimp();
1099         /*
1100          * Process only the control protocol queue until we have at
1101          * least one NCP open.
1102          *
1103          * Do always serve all three queues in Cisco mode.
1104          */
1105         IF_DEQUEUE(&sp->pp_cpq, m);
1106         if (m == NULL &&
1107             (sppp_ncp_check(sp) || sp->pp_mode == IFF_CISCO)) {
1108                 IF_DEQUEUE(&sp->pp_fastq, m);
1109                 if (m == NULL)
1110                         IF_DEQUEUE (&sp->pp_if.if_snd, m);
1111         }
1112         splx(s);
1113         return m;
1114 }
1115
1116 /*
1117  * Pick the next packet, do not remove it from the queue.
1118  */
1119 struct mbuf *
1120 sppp_pick(struct ifnet *ifp)
1121 {
1122         struct sppp *sp = (struct sppp*)ifp;
1123         struct mbuf *m;
1124         int s;
1125
1126         s= splimp ();
1127
1128         m = sp->pp_cpq.ifq_head;
1129         if (m == NULL &&
1130             (sp->pp_phase == PHASE_NETWORK || sp->pp_mode == IFF_CISCO))
1131                 if ((m = sp->pp_fastq.ifq_head) == NULL)
1132                         m = sp->pp_if.if_snd.ifq_head;
1133         splx (s);
1134         return (m);
1135 }
1136
1137 /*
1138  * Process an ioctl request.  Called on low priority level.
1139  */
1140 int
1141 sppp_ioctl(struct ifnet *ifp, IOCTL_CMD_T cmd, void *data)
1142 {
1143         struct ifreq *ifr = (struct ifreq*) data;
1144         struct sppp *sp = (struct sppp*) ifp;
1145         int s, rv, going_up, going_down, newmode;
1146
1147         s = splimp();
1148         rv = 0;
1149         switch (cmd) {
1150         case SIOCAIFADDR:
1151         case SIOCSIFDSTADDR:
1152                 break;
1153
1154         case SIOCSIFADDR:
1155                 /* set the interface "up" when assigning an IP address */
1156                 ifp->if_flags |= IFF_UP;
1157                 /* fall through... */
1158
1159         case SIOCSIFFLAGS:
1160                 going_up = ifp->if_flags & IFF_UP &&
1161                         (ifp->if_flags & IFF_RUNNING) == 0;
1162                 going_down = (ifp->if_flags & IFF_UP) == 0 &&
1163                         ifp->if_flags & IFF_RUNNING;
1164
1165                 newmode = ifp->if_flags & IFF_PASSIVE;
1166                 if (!newmode)
1167                         newmode = ifp->if_flags & IFF_AUTO;
1168                 if (!newmode)
1169                         newmode = ifp->if_flags & IFF_CISCO;
1170                 ifp->if_flags &= ~(IFF_PASSIVE | IFF_AUTO | IFF_CISCO);
1171                 ifp->if_flags |= newmode;
1172
1173                 if (newmode != sp->pp_mode) {
1174                         going_down = 1;
1175                         if (!going_up)
1176                                 going_up = ifp->if_flags & IFF_RUNNING;
1177                 }
1178
1179                 if (going_down) {
1180                         if (sp->pp_mode != IFF_CISCO)
1181                                 lcp.Close(sp);
1182                         else if (sp->pp_tlf)
1183                                 (sp->pp_tlf)(sp);
1184                         sppp_flush(ifp);
1185                         ifp->if_flags &= ~IFF_RUNNING;
1186                         sp->pp_mode = newmode;
1187                 }
1188
1189                 if (going_up) {
1190                         if (sp->pp_mode != IFF_CISCO)
1191                                 lcp.Close(sp);
1192                         sp->pp_mode = newmode;
1193                         if (sp->pp_mode == 0) {
1194                                 ifp->if_flags |= IFF_RUNNING;
1195                                 lcp.Open(sp);
1196                         }
1197                         if (sp->pp_mode == IFF_CISCO) {
1198                                 if (sp->pp_tls)
1199                                         (sp->pp_tls)(sp);
1200                                 ifp->if_flags |= IFF_RUNNING;
1201                         }
1202                 }
1203
1204                 break;
1205
1206 #ifdef SIOCSIFMTU
1207 #ifndef ifr_mtu
1208 #define ifr_mtu ifr_metric
1209 #endif
1210         case SIOCSIFMTU:
1211                 if (ifr->ifr_mtu < 128 || ifr->ifr_mtu > sp->lcp.their_mru)
1212                         return (EINVAL);
1213                 ifp->if_mtu = ifr->ifr_mtu;
1214                 break;
1215 #endif
1216 #ifdef SLIOCSETMTU
1217         case SLIOCSETMTU:
1218                 if (*(short*)data < 128 || *(short*)data > sp->lcp.their_mru)
1219                         return (EINVAL);
1220                 ifp->if_mtu = *(short*)data;
1221                 break;
1222 #endif
1223 #ifdef SIOCGIFMTU
1224         case SIOCGIFMTU:
1225                 ifr->ifr_mtu = ifp->if_mtu;
1226                 break;
1227 #endif
1228 #ifdef SLIOCGETMTU
1229         case SLIOCGETMTU:
1230                 *(short*)data = ifp->if_mtu;
1231                 break;
1232 #endif
1233         case SIOCADDMULTI:
1234         case SIOCDELMULTI:
1235                 break;
1236
1237         case SIOCGIFGENERIC:
1238         case SIOCSIFGENERIC:
1239                 rv = sppp_params(sp, cmd, data);
1240                 break;
1241
1242         default:
1243                 rv = ENOTTY;
1244         }
1245         splx(s);
1246         return rv;
1247 }
1248
1249 /*
1250  * Cisco framing implementation.
1251  */
1252
1253 /*
1254  * Handle incoming Cisco keepalive protocol packets.
1255  */
1256 static void
1257 sppp_cisco_input(struct sppp *sp, struct mbuf *m)
1258 {
1259         STDDCL;
1260         struct cisco_packet *h;
1261         u_long me, mymask;
1262
1263         if (m->m_pkthdr.len < CISCO_PACKET_LEN) {
1264                 if (debug)
1265                         log(LOG_DEBUG,
1266                             SPP_FMT "cisco invalid packet length: %d bytes\n",
1267                             SPP_ARGS(ifp), m->m_pkthdr.len);
1268                 return;
1269         }
1270         h = mtod (m, struct cisco_packet*);
1271         if (debug)
1272                 log(LOG_DEBUG,
1273                     SPP_FMT "cisco input: %d bytes "
1274                     "<0x%lx 0x%lx 0x%lx 0x%x 0x%x-0x%x>\n",
1275                     SPP_ARGS(ifp), m->m_pkthdr.len,
1276                     (u_long)ntohl (h->type), (u_long)h->par1, (u_long)h->par2, (u_int)h->rel,
1277                     (u_int)h->time0, (u_int)h->time1);
1278         switch (ntohl (h->type)) {
1279         default:
1280                 if (debug)
1281                         addlog(SPP_FMT "cisco unknown packet type: 0x%lx\n",
1282                                SPP_ARGS(ifp), (u_long)ntohl (h->type));
1283                 break;
1284         case CISCO_ADDR_REPLY:
1285                 /* Reply on address request, ignore */
1286                 break;
1287         case CISCO_KEEPALIVE_REQ:
1288                 sp->pp_alivecnt = 0;
1289                 sp->pp_rseq[IDX_LCP] = ntohl (h->par1);
1290                 if (sp->pp_seq[IDX_LCP] == sp->pp_rseq[IDX_LCP]) {
1291                         /* Local and remote sequence numbers are equal.
1292                          * Probably, the line is in loopback mode. */
1293                         if (sp->pp_loopcnt >= MAXALIVECNT) {
1294                                 printf (SPP_FMT "loopback\n",
1295                                         SPP_ARGS(ifp));
1296                                 sp->pp_loopcnt = 0;
1297                                 if (ifp->if_flags & IFF_UP) {
1298                                         if_down (ifp);
1299                                         sppp_qflush (&sp->pp_cpq);
1300                                 }
1301                         }
1302                         ++sp->pp_loopcnt;
1303
1304                         /* Generate new local sequence number */
1305 #if defined(__FreeBSD__) && __FreeBSD__ >= 3
1306                         sp->pp_seq[IDX_LCP] = random();
1307 #else
1308                         sp->pp_seq[IDX_LCP] ^= time.tv_sec ^ time.tv_usec;
1309 #endif
1310                         break;
1311                 }
1312                 sp->pp_loopcnt = 0;
1313                 if (! (ifp->if_flags & IFF_UP) &&
1314                     (ifp->if_flags & IFF_RUNNING)) {
1315                         if_up(ifp);
1316                         printf (SPP_FMT "up\n", SPP_ARGS(ifp));
1317                 }
1318                 break;
1319         case CISCO_ADDR_REQ:
1320                 sppp_get_ip_addrs(sp, &me, 0, &mymask);
1321                 if (me != 0L)
1322                         sppp_cisco_send(sp, CISCO_ADDR_REPLY, me, mymask);
1323                 break;
1324         }
1325 }
1326
1327 /*
1328  * Send Cisco keepalive packet.
1329  */
1330 static void
1331 sppp_cisco_send(struct sppp *sp, int type, long par1, long par2)
1332 {
1333         STDDCL;
1334         struct ppp_header *h;
1335         struct cisco_packet *ch;
1336         struct mbuf *m;
1337 #if defined(__FreeBSD__) && __FreeBSD__ >= 3
1338         struct timeval tv;
1339 #else
1340         u_long t = (time.tv_sec - boottime.tv_sec) * 1000;
1341 #endif
1342
1343 #if defined(__FreeBSD__) && __FreeBSD__ >= 3
1344         getmicrouptime(&tv);
1345 #endif
1346
1347         MGETHDR (m, M_DONTWAIT, MT_DATA);
1348         if (! m)
1349                 return;
1350         m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + CISCO_PACKET_LEN;
1351         m->m_pkthdr.rcvif = 0;
1352
1353         h = mtod (m, struct ppp_header*);
1354         h->address = CISCO_MULTICAST;
1355         h->control = 0;
1356         h->protocol = htons (CISCO_KEEPALIVE);
1357
1358         ch = (struct cisco_packet*) (h + 1);
1359         ch->type = htonl (type);
1360         ch->par1 = htonl (par1);
1361         ch->par2 = htonl (par2);
1362         ch->rel = -1;
1363
1364 #if defined(__FreeBSD__) && __FreeBSD__ >= 3
1365         ch->time0 = htons ((u_short) (tv.tv_sec >> 16));
1366         ch->time1 = htons ((u_short) tv.tv_sec);
1367 #else
1368         ch->time0 = htons ((u_short) (t >> 16));
1369         ch->time1 = htons ((u_short) t);
1370 #endif
1371
1372         if (debug)
1373                 log(LOG_DEBUG,
1374                     SPP_FMT "cisco output: <0x%lx 0x%lx 0x%lx 0x%x 0x%x-0x%x>\n",
1375                         SPP_ARGS(ifp), (u_long)ntohl (ch->type), (u_long)ch->par1,
1376                         (u_long)ch->par2, (u_int)ch->rel, (u_int)ch->time0, (u_int)ch->time1);
1377
1378         if (IF_QFULL (&sp->pp_cpq)) {
1379                 IF_DROP (&sp->pp_fastq);
1380                 IF_DROP (&ifp->if_snd);
1381                 m_freem (m);
1382         } else
1383                 IF_ENQUEUE (&sp->pp_cpq, m);
1384         if (! (ifp->if_flags & IFF_OACTIVE))
1385                 (*ifp->if_start) (ifp);
1386         ifp->if_obytes += m->m_pkthdr.len + 3;
1387 }
1388
1389 /*
1390  * PPP protocol implementation.
1391  */
1392
1393 /*
1394  * Send PPP control protocol packet.
1395  */
1396 static void
1397 sppp_cp_send(struct sppp *sp, u_short proto, u_char type,
1398              u_char ident, u_short len, void *data)
1399 {
1400         STDDCL;
1401         struct ppp_header *h;
1402         struct lcp_header *lh;
1403         struct mbuf *m;
1404
1405         if (len > MHLEN - PPP_HEADER_LEN - LCP_HEADER_LEN)
1406                 len = MHLEN - PPP_HEADER_LEN - LCP_HEADER_LEN;
1407         MGETHDR (m, M_DONTWAIT, MT_DATA);
1408         if (! m)
1409                 return;
1410         m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + LCP_HEADER_LEN + len;
1411         m->m_pkthdr.rcvif = 0;
1412
1413         h = mtod (m, struct ppp_header*);
1414         h->address = PPP_ALLSTATIONS;        /* broadcast address */
1415         h->control = PPP_UI;                 /* Unnumbered Info */
1416         h->protocol = htons (proto);         /* Link Control Protocol */
1417
1418         lh = (struct lcp_header*) (h + 1);
1419         lh->type = type;
1420         lh->ident = ident;
1421         lh->len = htons (LCP_HEADER_LEN + len);
1422         if (len)
1423                 bcopy (data, lh+1, len);
1424
1425         if (debug) {
1426                 log(LOG_DEBUG, SPP_FMT "%s output <%s id=0x%x len=%d",
1427                     SPP_ARGS(ifp),
1428                     sppp_proto_name(proto),
1429                     sppp_cp_type_name (lh->type), lh->ident,
1430                     ntohs (lh->len));
1431                 sppp_print_bytes ((u_char*) (lh+1), len);
1432                 addlog(">\n");
1433         }
1434         if (IF_QFULL (&sp->pp_cpq)) {
1435                 IF_DROP (&sp->pp_fastq);
1436                 IF_DROP (&ifp->if_snd);
1437                 m_freem (m);
1438                 ++ifp->if_oerrors;
1439         } else
1440                 IF_ENQUEUE (&sp->pp_cpq, m);
1441         if (! (ifp->if_flags & IFF_OACTIVE))
1442                 (*ifp->if_start) (ifp);
1443         ifp->if_obytes += m->m_pkthdr.len + 3;
1444 }
1445
1446 /*
1447  * Handle incoming PPP control protocol packets.
1448  */
1449 static void
1450 sppp_cp_input(const struct cp *cp, struct sppp *sp, struct mbuf *m)
1451 {
1452         STDDCL;
1453         struct lcp_header *h;
1454         int len = m->m_pkthdr.len;
1455         int rv;
1456         u_char *p;
1457
1458         if (len < 4) {
1459                 if (debug)
1460                         log(LOG_DEBUG,
1461                             SPP_FMT "%s invalid packet length: %d bytes\n",
1462                             SPP_ARGS(ifp), cp->name, len);
1463                 return;
1464         }
1465         h = mtod (m, struct lcp_header*);
1466         if (debug) {
1467                 log(LOG_DEBUG,
1468                     SPP_FMT "%s input(%s): <%s id=0x%x len=%d",
1469                     SPP_ARGS(ifp), cp->name,
1470                     sppp_state_name(sp->state[cp->protoidx]),
1471                     sppp_cp_type_name (h->type), h->ident, ntohs (h->len));
1472                 sppp_print_bytes ((u_char*) (h+1), len-4);
1473                 addlog(">\n");
1474         }
1475         if (len > ntohs (h->len))
1476                 len = ntohs (h->len);
1477         p = (u_char *)(h + 1);
1478         switch (h->type) {
1479         case CONF_REQ:
1480                 if (len < 4) {
1481                         if (debug)
1482                                 addlog(SPP_FMT "%s invalid conf-req length %d\n",
1483                                        SPP_ARGS(ifp), cp->name,
1484                                        len);
1485                         ++ifp->if_ierrors;
1486                         break;
1487                 }
1488                 /* handle states where RCR doesn't get a SCA/SCN */
1489                 switch (sp->state[cp->protoidx]) {
1490                 case STATE_CLOSING:
1491                 case STATE_STOPPING:
1492                         return;
1493                 case STATE_CLOSED:
1494                         sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident,
1495                                      0, 0);
1496                         return;
1497                 }
1498                 rv = (cp->RCR)(sp, h, len);
1499                 switch (sp->state[cp->protoidx]) {
1500                 case STATE_OPENED:
1501                         (cp->tld)(sp);
1502                         (cp->scr)(sp);
1503                         /* fall through... */
1504                 case STATE_ACK_SENT:
1505                 case STATE_REQ_SENT:
1506                         /*
1507                          * sppp_cp_change_state() have the side effect of
1508                          * restarting the timeouts. We want to avoid that
1509                          * if the state don't change, otherwise we won't
1510                          * ever timeout and resend a configuration request
1511                          * that got lost.
1512                          */
1513                         if (sp->state[cp->protoidx] == (rv ? STATE_ACK_SENT:
1514                             STATE_REQ_SENT))
1515                                 break;
1516                         sppp_cp_change_state(cp, sp, rv?
1517                                              STATE_ACK_SENT: STATE_REQ_SENT);
1518                         break;
1519                 case STATE_STOPPED:
1520                         sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1521                         (cp->scr)(sp);
1522                         sppp_cp_change_state(cp, sp, rv?
1523                                              STATE_ACK_SENT: STATE_REQ_SENT);
1524                         break;
1525                 case STATE_ACK_RCVD:
1526                         if (rv) {
1527                                 sppp_cp_change_state(cp, sp, STATE_OPENED);
1528                                 if (debug)
1529                                         log(LOG_DEBUG, SPP_FMT "%s tlu\n",
1530                                             SPP_ARGS(ifp),
1531                                             cp->name);
1532                                 (cp->tlu)(sp);
1533                         } else
1534                                 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD);
1535                         break;
1536                 default:
1537                         printf(SPP_FMT "%s illegal %s in state %s\n",
1538                                SPP_ARGS(ifp), cp->name,
1539                                sppp_cp_type_name(h->type),
1540                                sppp_state_name(sp->state[cp->protoidx]));
1541                         ++ifp->if_ierrors;
1542                 }
1543                 break;
1544         case CONF_ACK:
1545                 if (h->ident != sp->confid[cp->protoidx]) {
1546                         if (debug)
1547                                 addlog(SPP_FMT "%s id mismatch 0x%x != 0x%x\n",
1548                                        SPP_ARGS(ifp), cp->name,
1549                                        h->ident, sp->confid[cp->protoidx]);
1550                         ++ifp->if_ierrors;
1551                         break;
1552                 }
1553                 switch (sp->state[cp->protoidx]) {
1554                 case STATE_CLOSED:
1555                 case STATE_STOPPED:
1556                         sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0);
1557                         break;
1558                 case STATE_CLOSING:
1559                 case STATE_STOPPING:
1560                         break;
1561                 case STATE_REQ_SENT:
1562                         sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1563                         sppp_cp_change_state(cp, sp, STATE_ACK_RCVD);
1564                         break;
1565                 case STATE_OPENED:
1566                         (cp->tld)(sp);
1567                         /* fall through */
1568                 case STATE_ACK_RCVD:
1569                         (cp->scr)(sp);
1570                         sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1571                         break;
1572                 case STATE_ACK_SENT:
1573                         sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1574                         sppp_cp_change_state(cp, sp, STATE_OPENED);
1575                         if (debug)
1576                                 log(LOG_DEBUG, SPP_FMT "%s tlu\n",
1577                                        SPP_ARGS(ifp), cp->name);
1578                         (cp->tlu)(sp);
1579                         break;
1580                 default:
1581                         printf(SPP_FMT "%s illegal %s in state %s\n",
1582                                SPP_ARGS(ifp), cp->name,
1583                                sppp_cp_type_name(h->type),
1584                                sppp_state_name(sp->state[cp->protoidx]));
1585                         ++ifp->if_ierrors;
1586                 }
1587                 break;
1588         case CONF_NAK:
1589         case CONF_REJ:
1590                 if (h->ident != sp->confid[cp->protoidx]) {
1591                         if (debug)
1592                                 addlog(SPP_FMT "%s id mismatch 0x%x != 0x%x\n",
1593                                        SPP_ARGS(ifp), cp->name,
1594                                        h->ident, sp->confid[cp->protoidx]);
1595                         ++ifp->if_ierrors;
1596                         break;
1597                 }
1598                 if (h->type == CONF_NAK)
1599                         (cp->RCN_nak)(sp, h, len);
1600                 else /* CONF_REJ */
1601                         (cp->RCN_rej)(sp, h, len);
1602
1603                 switch (sp->state[cp->protoidx]) {
1604                 case STATE_CLOSED:
1605                 case STATE_STOPPED:
1606                         sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0);
1607                         break;
1608                 case STATE_REQ_SENT:
1609                 case STATE_ACK_SENT:
1610                         sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1611                         /*
1612                          * Slow things down a bit if we think we might be
1613                          * in loopback. Depend on the timeout to send the
1614                          * next configuration request.
1615                          */
1616                         if (sp->pp_loopcnt)
1617                                 break;
1618                         (cp->scr)(sp);
1619                         break;
1620                 case STATE_OPENED:
1621                         (cp->tld)(sp);
1622                         /* fall through */
1623                 case STATE_ACK_RCVD:
1624                         sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1625                         (cp->scr)(sp);
1626                         break;
1627                 case STATE_CLOSING:
1628                 case STATE_STOPPING:
1629                         break;
1630                 default:
1631                         printf(SPP_FMT "%s illegal %s in state %s\n",
1632                                SPP_ARGS(ifp), cp->name,
1633                                sppp_cp_type_name(h->type),
1634                                sppp_state_name(sp->state[cp->protoidx]));
1635                         ++ifp->if_ierrors;
1636                 }
1637                 break;
1638
1639         case TERM_REQ:
1640                 switch (sp->state[cp->protoidx]) {
1641                 case STATE_ACK_RCVD:
1642                 case STATE_ACK_SENT:
1643                         sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1644                         /* fall through */
1645                 case STATE_CLOSED:
1646                 case STATE_STOPPED:
1647                 case STATE_CLOSING:
1648                 case STATE_STOPPING:
1649                 case STATE_REQ_SENT:
1650                   sta:
1651                         /* Send Terminate-Ack packet. */
1652                         if (debug)
1653                                 log(LOG_DEBUG, SPP_FMT "%s send terminate-ack\n",
1654                                     SPP_ARGS(ifp), cp->name);
1655                         sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0);
1656                         break;
1657                 case STATE_OPENED:
1658                         (cp->tld)(sp);
1659                         sp->rst_counter[cp->protoidx] = 0;
1660                         sppp_cp_change_state(cp, sp, STATE_STOPPING);
1661                         goto sta;
1662                         break;
1663                 default:
1664                         printf(SPP_FMT "%s illegal %s in state %s\n",
1665                                SPP_ARGS(ifp), cp->name,
1666                                sppp_cp_type_name(h->type),
1667                                sppp_state_name(sp->state[cp->protoidx]));
1668                         ++ifp->if_ierrors;
1669                 }
1670                 break;
1671         case TERM_ACK:
1672                 switch (sp->state[cp->protoidx]) {
1673                 case STATE_CLOSED:
1674                 case STATE_STOPPED:
1675                 case STATE_REQ_SENT:
1676                 case STATE_ACK_SENT:
1677                         break;
1678                 case STATE_CLOSING:
1679                         sppp_cp_change_state(cp, sp, STATE_CLOSED);
1680                         (cp->tlf)(sp);
1681                         break;
1682                 case STATE_STOPPING:
1683                         sppp_cp_change_state(cp, sp, STATE_STOPPED);
1684                         (cp->tlf)(sp);
1685                         break;
1686                 case STATE_ACK_RCVD:
1687                         sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1688                         break;
1689                 case STATE_OPENED:
1690                         (cp->tld)(sp);
1691                         (cp->scr)(sp);
1692                         sppp_cp_change_state(cp, sp, STATE_ACK_RCVD);
1693                         break;
1694                 default:
1695                         printf(SPP_FMT "%s illegal %s in state %s\n",
1696                                SPP_ARGS(ifp), cp->name,
1697                                sppp_cp_type_name(h->type),
1698                                sppp_state_name(sp->state[cp->protoidx]));
1699                         ++ifp->if_ierrors;
1700                 }
1701                 break;
1702         case CODE_REJ:
1703                 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */
1704                 log(LOG_INFO,
1705                     SPP_FMT "%s: ignoring RXJ (%s) for proto 0x%x, "
1706                     "danger will robinson\n",
1707                     SPP_ARGS(ifp), cp->name,
1708                     sppp_cp_type_name(h->type), ntohs(*((u_short *)p)));
1709                 switch (sp->state[cp->protoidx]) {
1710                 case STATE_CLOSED:
1711                 case STATE_STOPPED:
1712                 case STATE_REQ_SENT:
1713                 case STATE_ACK_SENT:
1714                 case STATE_CLOSING:
1715                 case STATE_STOPPING:
1716                 case STATE_OPENED:
1717                         break;
1718                 case STATE_ACK_RCVD:
1719                         sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1720                         break;
1721                 default:
1722                         printf(SPP_FMT "%s illegal %s in state %s\n",
1723                                SPP_ARGS(ifp), cp->name,
1724                                sppp_cp_type_name(h->type),
1725                                sppp_state_name(sp->state[cp->protoidx]));
1726                         ++ifp->if_ierrors;
1727                 }
1728                 break;
1729         case PROTO_REJ:
1730             {
1731                 int catastrophic;
1732                 const struct cp *upper;
1733                 int i;
1734                 u_int16_t proto;
1735
1736                 catastrophic = 0;
1737                 upper = NULL;
1738                 proto = ntohs(*((u_int16_t *)p));
1739                 for (i = 0; i < IDX_COUNT; i++) {
1740                         if (cps[i]->proto == proto) {
1741                                 upper = cps[i];
1742                                 break;
1743                         }
1744                 }
1745                 if (upper == NULL)
1746                         catastrophic++;
1747
1748                 if (catastrophic || debug)
1749                         log(catastrophic? LOG_INFO: LOG_DEBUG,
1750                             SPP_FMT "%s: RXJ%c (%s) for proto 0x%x (%s/%s)\n",
1751                             SPP_ARGS(ifp), cp->name, catastrophic ? '-' : '+',
1752                             sppp_cp_type_name(h->type), proto,
1753                             upper ? upper->name : "unknown",
1754                             upper ? sppp_state_name(sp->state[upper->protoidx]) : "?");
1755
1756                 /*
1757                  * if we got RXJ+ against conf-req, the peer does not implement
1758                  * this particular protocol type.  terminate the protocol.
1759                  */
1760                 if (upper && !catastrophic) {
1761                         if (sp->state[upper->protoidx] == STATE_REQ_SENT) {
1762                                 upper->Close(sp);
1763                                 break;
1764                         }
1765                 }
1766
1767                 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */
1768                 switch (sp->state[cp->protoidx]) {
1769                 case STATE_CLOSED:
1770                 case STATE_STOPPED:
1771                 case STATE_REQ_SENT:
1772                 case STATE_ACK_SENT:
1773                 case STATE_CLOSING:
1774                 case STATE_STOPPING:
1775                 case STATE_OPENED:
1776                         break;
1777                 case STATE_ACK_RCVD:
1778                         sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1779                         break;
1780                 default:
1781                         printf(SPP_FMT "%s illegal %s in state %s\n",
1782                                SPP_ARGS(ifp), cp->name,
1783                                sppp_cp_type_name(h->type),
1784                                sppp_state_name(sp->state[cp->protoidx]));
1785                         ++ifp->if_ierrors;
1786                 }
1787                 break;
1788             }
1789         case DISC_REQ:
1790                 if (cp->proto != PPP_LCP)
1791                         goto illegal;
1792                 /* Discard the packet. */
1793                 break;
1794         case ECHO_REQ:
1795                 if (cp->proto != PPP_LCP)
1796                         goto illegal;
1797                 if (sp->state[cp->protoidx] != STATE_OPENED) {
1798                         if (debug)
1799                                 addlog(SPP_FMT "lcp echo req but lcp closed\n",
1800                                        SPP_ARGS(ifp));
1801                         ++ifp->if_ierrors;
1802                         break;
1803                 }
1804                 if (len < 8) {
1805                         if (debug)
1806                                 addlog(SPP_FMT "invalid lcp echo request "
1807                                        "packet length: %d bytes\n",
1808                                        SPP_ARGS(ifp), len);
1809                         break;
1810                 }
1811                 if ((sp->lcp.opts & (1 << LCP_OPT_MAGIC)) &&
1812                     ntohl (*(long*)(h+1)) == sp->lcp.magic) {
1813                         /* Line loopback mode detected. */
1814                         printf(SPP_FMT "loopback\n", SPP_ARGS(ifp));
1815                         sp->pp_loopcnt = MAXALIVECNT * 5;
1816                         if_down (ifp);
1817                         sppp_qflush (&sp->pp_cpq);
1818
1819                         /* Shut down the PPP link. */
1820                         /* XXX */
1821                         lcp.Down(sp);
1822                         lcp.Up(sp);
1823                         break;
1824                 }
1825                 *(long*)(h+1) = htonl (sp->lcp.magic);
1826                 if (debug)
1827                         addlog(SPP_FMT "got lcp echo req, sending echo rep\n",
1828                                SPP_ARGS(ifp));
1829                 sppp_cp_send (sp, PPP_LCP, ECHO_REPLY, h->ident, len-4, h+1);
1830                 break;
1831         case ECHO_REPLY:
1832                 if (cp->proto != PPP_LCP)
1833                         goto illegal;
1834                 if (h->ident != sp->lcp.echoid) {
1835                         ++ifp->if_ierrors;
1836                         break;
1837                 }
1838                 if (len < 8) {
1839                         if (debug)
1840                                 addlog(SPP_FMT "lcp invalid echo reply "
1841                                        "packet length: %d bytes\n",
1842                                        SPP_ARGS(ifp), len);
1843                         break;
1844                 }
1845                 if (debug)
1846                         addlog(SPP_FMT "lcp got echo rep\n",
1847                                SPP_ARGS(ifp));
1848                 if (!(sp->lcp.opts & (1 << LCP_OPT_MAGIC)) ||
1849                     ntohl (*(long*)(h+1)) != sp->lcp.magic)
1850                         sp->pp_alivecnt = 0;
1851                 break;
1852         default:
1853                 /* Unknown packet type -- send Code-Reject packet. */
1854           illegal:
1855                 if (debug)
1856                         addlog(SPP_FMT "%s send code-rej for 0x%x\n",
1857                                SPP_ARGS(ifp), cp->name, h->type);
1858                 sppp_cp_send(sp, cp->proto, CODE_REJ,
1859                              ++sp->pp_seq[cp->protoidx], m->m_pkthdr.len, h);
1860                 ++ifp->if_ierrors;
1861         }
1862 }
1863
1864
1865 /*
1866  * The generic part of all Up/Down/Open/Close/TO event handlers.
1867  * Basically, the state transition handling in the automaton.
1868  */
1869 static void
1870 sppp_up_event(const struct cp *cp, struct sppp *sp)
1871 {
1872         STDDCL;
1873
1874         if (debug)
1875                 log(LOG_DEBUG, SPP_FMT "%s up(%s)\n",
1876                     SPP_ARGS(ifp), cp->name,
1877                     sppp_state_name(sp->state[cp->protoidx]));
1878
1879         switch (sp->state[cp->protoidx]) {
1880         case STATE_INITIAL:
1881                 sppp_cp_change_state(cp, sp, STATE_CLOSED);
1882                 break;
1883         case STATE_STARTING:
1884                 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1885                 (cp->scr)(sp);
1886                 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1887                 break;
1888         default:
1889                 printf(SPP_FMT "%s illegal up in state %s\n",
1890                        SPP_ARGS(ifp), cp->name,
1891                        sppp_state_name(sp->state[cp->protoidx]));
1892         }
1893 }
1894
1895 static void
1896 sppp_down_event(const struct cp *cp, struct sppp *sp)
1897 {
1898         STDDCL;
1899
1900         if (debug)
1901                 log(LOG_DEBUG, SPP_FMT "%s down(%s)\n",
1902                     SPP_ARGS(ifp), cp->name,
1903                     sppp_state_name(sp->state[cp->protoidx]));
1904
1905         switch (sp->state[cp->protoidx]) {
1906         case STATE_CLOSED:
1907         case STATE_CLOSING:
1908                 sppp_cp_change_state(cp, sp, STATE_INITIAL);
1909                 break;
1910         case STATE_STOPPED:
1911                 sppp_cp_change_state(cp, sp, STATE_STARTING);
1912                 (cp->tls)(sp);
1913                 break;
1914         case STATE_STOPPING:
1915         case STATE_REQ_SENT:
1916         case STATE_ACK_RCVD:
1917         case STATE_ACK_SENT:
1918                 sppp_cp_change_state(cp, sp, STATE_STARTING);
1919                 break;
1920         case STATE_OPENED:
1921                 (cp->tld)(sp);
1922                 sppp_cp_change_state(cp, sp, STATE_STARTING);
1923                 break;
1924         default:
1925                 printf(SPP_FMT "%s illegal down in state %s\n",
1926                        SPP_ARGS(ifp), cp->name,
1927                        sppp_state_name(sp->state[cp->protoidx]));
1928         }
1929 }
1930
1931
1932 static void
1933 sppp_open_event(const struct cp *cp, struct sppp *sp)
1934 {
1935         STDDCL;
1936
1937         if (debug)
1938                 log(LOG_DEBUG, SPP_FMT "%s open(%s)\n",
1939                     SPP_ARGS(ifp), cp->name,
1940                     sppp_state_name(sp->state[cp->protoidx]));
1941
1942         switch (sp->state[cp->protoidx]) {
1943         case STATE_INITIAL:
1944                 sppp_cp_change_state(cp, sp, STATE_STARTING);
1945                 (cp->tls)(sp);
1946                 break;
1947         case STATE_STARTING:
1948                 break;
1949         case STATE_CLOSED:
1950                 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1951                 (cp->scr)(sp);
1952                 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1953                 break;
1954         case STATE_STOPPED:
1955                 /*
1956                  * Try escaping stopped state.  This seems to bite
1957                  * people occasionally, in particular for IPCP,
1958                  * presumably following previous IPCP negotiation
1959                  * aborts.  Somehow, we must have missed a Down event
1960                  * which would have caused a transition into starting
1961                  * state, so as a bandaid we force the Down event now.
1962                  * This effectively implements (something like the)
1963                  * `restart' option mentioned in the state transition
1964                  * table of RFC 1661.
1965                  */
1966                 sppp_cp_change_state(cp, sp, STATE_STARTING);
1967                 (cp->tls)(sp);
1968                 break;
1969         case STATE_STOPPING:
1970         case STATE_REQ_SENT:
1971         case STATE_ACK_RCVD:
1972         case STATE_ACK_SENT:
1973         case STATE_OPENED:
1974                 break;
1975         case STATE_CLOSING:
1976                 sppp_cp_change_state(cp, sp, STATE_STOPPING);
1977                 break;
1978         }
1979 }
1980
1981
1982 static void
1983 sppp_close_event(const struct cp *cp, struct sppp *sp)
1984 {
1985         STDDCL;
1986
1987         if (debug)
1988                 log(LOG_DEBUG, SPP_FMT "%s close(%s)\n",
1989                     SPP_ARGS(ifp), cp->name,
1990                     sppp_state_name(sp->state[cp->protoidx]));
1991
1992         switch (sp->state[cp->protoidx]) {
1993         case STATE_INITIAL:
1994         case STATE_CLOSED:
1995         case STATE_CLOSING:
1996                 break;
1997         case STATE_STARTING:
1998                 sppp_cp_change_state(cp, sp, STATE_INITIAL);
1999                 (cp->tlf)(sp);
2000                 break;
2001         case STATE_STOPPED:
2002                 sppp_cp_change_state(cp, sp, STATE_CLOSED);
2003                 break;
2004         case STATE_STOPPING:
2005                 sppp_cp_change_state(cp, sp, STATE_CLOSING);
2006                 break;
2007         case STATE_OPENED:
2008                 (cp->tld)(sp);
2009                 /* fall through */
2010         case STATE_REQ_SENT:
2011         case STATE_ACK_RCVD:
2012         case STATE_ACK_SENT:
2013                 sp->rst_counter[cp->protoidx] = sp->lcp.max_terminate;
2014                 sppp_cp_send(sp, cp->proto, TERM_REQ,
2015                              ++sp->pp_seq[cp->protoidx], 0, 0);
2016                 sppp_cp_change_state(cp, sp, STATE_CLOSING);
2017                 break;
2018         }
2019 }
2020
2021 static void
2022 sppp_to_event(const struct cp *cp, struct sppp *sp)
2023 {
2024         STDDCL;
2025         int s;
2026
2027         s = splimp();
2028         if (debug)
2029                 log(LOG_DEBUG, SPP_FMT "%s TO(%s) rst_counter = %d\n",
2030                     SPP_ARGS(ifp), cp->name,
2031                     sppp_state_name(sp->state[cp->protoidx]),
2032                     sp->rst_counter[cp->protoidx]);
2033
2034         if (--sp->rst_counter[cp->protoidx] < 0)
2035                 /* TO- event */
2036                 switch (sp->state[cp->protoidx]) {
2037                 case STATE_CLOSING:
2038                         sppp_cp_change_state(cp, sp, STATE_CLOSED);
2039                         (cp->tlf)(sp);
2040                         break;
2041                 case STATE_STOPPING:
2042                         sppp_cp_change_state(cp, sp, STATE_STOPPED);
2043                         (cp->tlf)(sp);
2044                         break;
2045                 case STATE_REQ_SENT:
2046                 case STATE_ACK_RCVD:
2047                 case STATE_ACK_SENT:
2048                         sppp_cp_change_state(cp, sp, STATE_STOPPED);
2049                         (cp->tlf)(sp);
2050                         break;
2051                 }
2052         else
2053                 /* TO+ event */
2054                 switch (sp->state[cp->protoidx]) {
2055                 case STATE_CLOSING:
2056                 case STATE_STOPPING:
2057                         sppp_cp_send(sp, cp->proto, TERM_REQ,
2058                                      ++sp->pp_seq[cp->protoidx], 0, 0);
2059                         TIMEOUT(cp->TO, (void *)sp, sp->lcp.timeout,
2060                             sp->ch[cp->protoidx]);
2061                         break;
2062                 case STATE_REQ_SENT:
2063                 case STATE_ACK_RCVD:
2064                         (cp->scr)(sp);
2065                         /* sppp_cp_change_state() will restart the timer */
2066                         sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
2067                         break;
2068                 case STATE_ACK_SENT:
2069                         (cp->scr)(sp);
2070                         TIMEOUT(cp->TO, (void *)sp, sp->lcp.timeout,
2071                             sp->ch[cp->protoidx]);
2072                         break;
2073                 }
2074
2075         splx(s);
2076 }
2077
2078 /*
2079  * Change the state of a control protocol in the state automaton.
2080  * Takes care of starting/stopping the restart timer.
2081  */
2082 void
2083 sppp_cp_change_state(const struct cp *cp, struct sppp *sp, int newstate)
2084 {
2085         sp->state[cp->protoidx] = newstate;
2086
2087         UNTIMEOUT(cp->TO, (void *)sp, sp->ch[cp->protoidx]);
2088         switch (newstate) {
2089         case STATE_INITIAL:
2090         case STATE_STARTING:
2091         case STATE_CLOSED:
2092         case STATE_STOPPED:
2093         case STATE_OPENED:
2094                 break;
2095         case STATE_CLOSING:
2096         case STATE_STOPPING:
2097         case STATE_REQ_SENT:
2098         case STATE_ACK_RCVD:
2099         case STATE_ACK_SENT:
2100                 TIMEOUT(cp->TO, (void *)sp, sp->lcp.timeout,
2101                     sp->ch[cp->protoidx]);
2102                 break;
2103         }
2104 }
2105
2106 /*
2107  *--------------------------------------------------------------------------*
2108  *                                                                          *
2109  *                         The LCP implementation.                          *
2110  *                                                                          *
2111  *--------------------------------------------------------------------------*
2112  */
2113 static void
2114 sppp_lcp_init(struct sppp *sp)
2115 {
2116         sp->lcp.opts = (1 << LCP_OPT_MAGIC);
2117         sp->lcp.magic = 0;
2118         sp->state[IDX_LCP] = STATE_INITIAL;
2119         sp->fail_counter[IDX_LCP] = 0;
2120         sp->pp_seq[IDX_LCP] = 0;
2121         sp->pp_rseq[IDX_LCP] = 0;
2122         sp->lcp.protos = 0;
2123         sp->lcp.mru = sp->lcp.their_mru = PP_MTU;
2124
2125         /* Note that these values are  relevant for all control protocols */
2126         sp->lcp.timeout = 3 * hz;
2127         sp->lcp.max_terminate = 2;
2128         sp->lcp.max_configure = 10;
2129         sp->lcp.max_failure = 10;
2130 #if defined(__FreeBSD__) && __FreeBSD__ >= 3
2131         callout_handle_init(&sp->ch[IDX_LCP]);
2132 #endif
2133 }
2134
2135 static void
2136 sppp_lcp_up(struct sppp *sp)
2137 {
2138         STDDCL;
2139
2140         sp->pp_alivecnt = 0;
2141         sp->lcp.opts = (1 << LCP_OPT_MAGIC);
2142         sp->lcp.magic = 0;
2143         sp->lcp.protos = 0;
2144         sp->lcp.mru = sp->lcp.their_mru = PP_MTU;
2145         /*
2146          * If this interface is passive or dial-on-demand, and we are
2147          * still in Initial state, it means we've got an incoming
2148          * call.  Activate the interface.
2149          */
2150         if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) != 0) {
2151                 if (debug)
2152                         log(LOG_DEBUG,
2153                             SPP_FMT "Up event", SPP_ARGS(ifp));
2154                 ifp->if_flags |= IFF_RUNNING;
2155                 if (sp->state[IDX_LCP] == STATE_INITIAL) {
2156                         if (debug)
2157                                 addlog("(incoming call)\n");
2158                         sp->pp_flags |= PP_CALLIN;
2159                         lcp.Open(sp);
2160                 } else if (debug)
2161                         addlog("\n");
2162         } else if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0 &&
2163                    (sp->state[IDX_LCP] == STATE_INITIAL)) {
2164                 ifp->if_flags |= IFF_RUNNING;
2165                 lcp.Open(sp);
2166         }
2167
2168         sppp_up_event(&lcp, sp);
2169 }
2170
2171 static void
2172 sppp_lcp_down(struct sppp *sp)
2173 {
2174         STDDCL;
2175
2176         sppp_down_event(&lcp, sp);
2177
2178         /*
2179          * If this is neither a dial-on-demand nor a passive
2180          * interface, simulate an ``ifconfig down'' action, so the
2181          * administrator can force a redial by another ``ifconfig
2182          * up''.  XXX For leased line operation, should we immediately
2183          * try to reopen the connection here?
2184          */
2185         if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0) {
2186                 log(LOG_INFO,
2187                     SPP_FMT "Down event, taking interface down.\n",
2188                     SPP_ARGS(ifp));
2189                 if_down(ifp);
2190         } else {
2191                 if (debug)
2192                         log(LOG_DEBUG,
2193                             SPP_FMT "Down event (carrier loss)\n",
2194                             SPP_ARGS(ifp));
2195                 sp->pp_flags &= ~PP_CALLIN;
2196                 if (sp->state[IDX_LCP] != STATE_INITIAL)
2197                         lcp.Close(sp);
2198                 ifp->if_flags &= ~IFF_RUNNING;
2199         }
2200 }
2201
2202 static void
2203 sppp_lcp_open(struct sppp *sp)
2204 {
2205         /*
2206          * If we are authenticator, negotiate LCP_AUTH
2207          */
2208         if (sp->hisauth.proto != 0)
2209                 sp->lcp.opts |= (1 << LCP_OPT_AUTH_PROTO);
2210         else
2211                 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO);
2212         sp->pp_flags &= ~PP_NEEDAUTH;
2213         sppp_open_event(&lcp, sp);
2214 }
2215
2216 static void
2217 sppp_lcp_close(struct sppp *sp)
2218 {
2219         sppp_close_event(&lcp, sp);
2220 }
2221
2222 static void
2223 sppp_lcp_TO(void *cookie)
2224 {
2225         sppp_to_event(&lcp, (struct sppp *)cookie);
2226 }
2227
2228 /*
2229  * Analyze a configure request.  Return true if it was agreeable, and
2230  * caused action sca, false if it has been rejected or nak'ed, and
2231  * caused action scn.  (The return value is used to make the state
2232  * transition decision in the state automaton.)
2233  */
2234 static int
2235 sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len)
2236 {
2237         STDDCL;
2238         u_char *buf, *r, *p;
2239         int origlen, rlen;
2240         u_long nmagic;
2241         u_short authproto;
2242
2243         len -= 4;
2244         origlen = len;
2245         buf = r = malloc (len, M_TEMP, M_NOWAIT);
2246         if (! buf)
2247                 return (0);
2248
2249         if (debug)
2250                 log(LOG_DEBUG, SPP_FMT "lcp parse opts: ",
2251                     SPP_ARGS(ifp));
2252
2253         /* pass 1: check for things that need to be rejected */
2254         p = (void*) (h+1);
2255         for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) {
2256                 if (debug)
2257                         addlog(" %s ", sppp_lcp_opt_name(*p));
2258                 switch (*p) {
2259                 case LCP_OPT_MAGIC:
2260                         /* Magic number. */
2261                         if (len >= 6 && p[1] == 6)
2262                                 continue;
2263                         if (debug)
2264                                 addlog("[invalid] ");
2265                         break;
2266                 case LCP_OPT_ASYNC_MAP:
2267                         /* Async control character map. */
2268                         if (len >= 6 && p[1] == 6)
2269                                 continue;
2270                         if (debug)
2271                                 addlog("[invalid] ");
2272                         break;
2273                 case LCP_OPT_MRU:
2274                         /* Maximum receive unit. */
2275                         if (len >= 4 && p[1] == 4)
2276                                 continue;
2277                         if (debug)
2278                                 addlog("[invalid] ");
2279                         break;
2280                 case LCP_OPT_AUTH_PROTO:
2281                         if (len < 4) {
2282                                 if (debug)
2283                                         addlog("[invalid] ");
2284                                 break;
2285                         }
2286                         authproto = (p[2] << 8) + p[3];
2287                         if (authproto == PPP_CHAP && p[1] != 5) {
2288                                 if (debug)
2289                                         addlog("[invalid chap len] ");
2290                                 break;
2291                         }
2292                         if (sp->myauth.proto == 0) {
2293                                 /* we are not configured to do auth */
2294                                 if (debug)
2295                                         addlog("[not configured] ");
2296                                 break;
2297                         }
2298                         /*
2299                          * Remote want us to authenticate, remember this,
2300                          * so we stay in PHASE_AUTHENTICATE after LCP got
2301                          * up.
2302                          */
2303                         sp->pp_flags |= PP_NEEDAUTH;
2304                         continue;
2305                 default:
2306                         /* Others not supported. */
2307                         if (debug)
2308                                 addlog("[rej] ");
2309                         break;
2310                 }
2311                 /* Add the option to rejected list. */
2312                 bcopy (p, r, p[1]);
2313                 r += p[1];
2314                 rlen += p[1];
2315         }
2316         if (rlen) {
2317                 if (debug)
2318                         addlog(" send conf-rej\n");
2319                 sppp_cp_send (sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf);
2320                 return 0;
2321         } else if (debug)
2322                 addlog("\n");
2323
2324         /*
2325          * pass 2: check for option values that are unacceptable and
2326          * thus require to be nak'ed.
2327          */
2328         if (debug)
2329                 log(LOG_DEBUG, SPP_FMT "lcp parse opt values: ",
2330                     SPP_ARGS(ifp));
2331
2332         p = (void*) (h+1);
2333         len = origlen;
2334         for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) {
2335                 if (debug)
2336                         addlog(" %s ", sppp_lcp_opt_name(*p));
2337                 switch (*p) {
2338                 case LCP_OPT_MAGIC:
2339                         /* Magic number -- extract. */
2340                         nmagic = (u_long)p[2] << 24 |
2341                                 (u_long)p[3] << 16 | p[4] << 8 | p[5];
2342                         if (nmagic != sp->lcp.magic) {
2343                                 sp->pp_loopcnt = 0;
2344                                 if (debug)
2345                                         addlog("0x%lx ", nmagic);
2346                                 continue;
2347                         }
2348                         if (debug && sp->pp_loopcnt < MAXALIVECNT*5)
2349                                 addlog("[glitch] ");
2350                         ++sp->pp_loopcnt;
2351                         /*
2352                          * We negate our magic here, and NAK it.  If
2353                          * we see it later in an NAK packet, we
2354                          * suggest a new one.
2355                          */
2356                         nmagic = ~sp->lcp.magic;
2357                         /* Gonna NAK it. */
2358                         p[2] = nmagic >> 24;
2359                         p[3] = nmagic >> 16;
2360                         p[4] = nmagic >> 8;
2361                         p[5] = nmagic;
2362                         break;
2363
2364                 case LCP_OPT_ASYNC_MAP:
2365                         /*
2366                          * Async control character map -- just ignore it.
2367                          *
2368                          * Quote from RFC 1662, chapter 6:
2369                          * To enable this functionality, synchronous PPP
2370                          * implementations MUST always respond to the
2371                          * Async-Control-Character-Map Configuration
2372                          * Option with the LCP Configure-Ack.  However,
2373                          * acceptance of the Configuration Option does
2374                          * not imply that the synchronous implementation
2375                          * will do any ACCM mapping.  Instead, all such
2376                          * octet mapping will be performed by the
2377                          * asynchronous-to-synchronous converter.
2378                          */
2379                         continue;
2380
2381                 case LCP_OPT_MRU:
2382                         /*
2383                          * Maximum receive unit.  Always agreeable,
2384                          * but ignored by now.
2385                          */
2386                         sp->lcp.their_mru = p[2] * 256 + p[3];
2387                         if (debug)
2388                                 addlog("%lu ", sp->lcp.their_mru);
2389                         continue;
2390
2391                 case LCP_OPT_AUTH_PROTO:
2392                         authproto = (p[2] << 8) + p[3];
2393                         if (sp->myauth.proto != authproto) {
2394                                 /* not agreed, nak */
2395                                 if (debug)
2396                                         addlog("[mine %s != his %s] ",
2397                                                sppp_proto_name(sp->hisauth.proto),
2398                                                sppp_proto_name(authproto));
2399                                 p[2] = sp->myauth.proto >> 8;
2400                                 p[3] = sp->myauth.proto;
2401                                 break;
2402                         }
2403                         if (authproto == PPP_CHAP && p[4] != CHAP_MD5) {
2404                                 if (debug)
2405                                         addlog("[chap not MD5] ");
2406                                 p[4] = CHAP_MD5;
2407                                 break;
2408                         }
2409                         continue;
2410                 }
2411                 /* Add the option to nak'ed list. */
2412                 bcopy (p, r, p[1]);
2413                 r += p[1];
2414                 rlen += p[1];
2415         }
2416         if (rlen) {
2417                 /*
2418                  * Local and remote magics equal -- loopback?
2419                  */
2420                 if (sp->pp_loopcnt >= MAXALIVECNT*5) {
2421                         if (sp->pp_loopcnt == MAXALIVECNT*5)
2422                                 printf (SPP_FMT "loopback\n",
2423                                         SPP_ARGS(ifp));
2424                         if (ifp->if_flags & IFF_UP) {
2425                                 if_down(ifp);
2426                                 sppp_qflush(&sp->pp_cpq);
2427                                 /* XXX ? */
2428                                 lcp.Down(sp);
2429                                 lcp.Up(sp);
2430                         }
2431                 } else if (++sp->fail_counter[IDX_LCP] >= sp->lcp.max_failure) {
2432                         if (debug)
2433                                 addlog(" max_failure (%d) exceeded, "
2434                                        "send conf-rej\n",
2435                                        sp->lcp.max_failure);
2436                         sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf);
2437                 } else {
2438                         if (debug)
2439                                 addlog(" send conf-nak\n");
2440                         sppp_cp_send (sp, PPP_LCP, CONF_NAK, h->ident, rlen, buf);
2441                 }
2442         } else {
2443                 if (debug)
2444                         addlog(" send conf-ack\n");
2445                 sp->fail_counter[IDX_LCP] = 0;
2446                 sp->pp_loopcnt = 0;
2447                 sppp_cp_send (sp, PPP_LCP, CONF_ACK,
2448                               h->ident, origlen, h+1);
2449         }
2450
2451         free (buf, M_TEMP);
2452         return (rlen == 0);
2453 }
2454
2455 /*
2456  * Analyze the LCP Configure-Reject option list, and adjust our
2457  * negotiation.
2458  */
2459 static void
2460 sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
2461 {
2462         STDDCL;
2463         u_char *buf, *p;
2464
2465         len -= 4;
2466         buf = malloc (len, M_TEMP, M_NOWAIT);
2467         if (!buf)
2468                 return;
2469
2470         if (debug)
2471                 log(LOG_DEBUG, SPP_FMT "lcp rej opts: ",
2472                     SPP_ARGS(ifp));
2473
2474         p = (void*) (h+1);
2475         for (; len > 1 && p[1]; len -= p[1], p += p[1]) {
2476                 if (debug)
2477                         addlog(" %s ", sppp_lcp_opt_name(*p));
2478                 switch (*p) {
2479                 case LCP_OPT_MAGIC:
2480                         /* Magic number -- can't use it, use 0 */
2481                         sp->lcp.opts &= ~(1 << LCP_OPT_MAGIC);
2482                         sp->lcp.magic = 0;
2483                         break;
2484                 case LCP_OPT_MRU:
2485                         /*
2486                          * Should not be rejected anyway, since we only
2487                          * negotiate a MRU if explicitly requested by
2488                          * peer.
2489                          */
2490                         sp->lcp.opts &= ~(1 << LCP_OPT_MRU);
2491                         break;
2492                 case LCP_OPT_AUTH_PROTO:
2493                         /*
2494                          * Peer doesn't want to authenticate himself,
2495                          * deny unless this is a dialout call, and
2496                          * AUTHFLAG_NOCALLOUT is set.
2497                          */
2498                         if ((sp->pp_flags & PP_CALLIN) == 0 &&
2499                             (sp->hisauth.flags & AUTHFLAG_NOCALLOUT) != 0) {
2500                                 if (debug)
2501                                         addlog("[don't insist on auth "
2502                                                "for callout]");
2503                                 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO);
2504                                 break;
2505                         }
2506                         if (debug)
2507                                 addlog("[access denied]\n");
2508                         lcp.Close(sp);
2509                         break;
2510                 }
2511         }
2512         if (debug)
2513                 addlog("\n");
2514         free (buf, M_TEMP);
2515         return;
2516 }
2517
2518 /*
2519  * Analyze the LCP Configure-NAK option list, and adjust our
2520  * negotiation.
2521  */
2522 static void
2523 sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
2524 {
2525         STDDCL;
2526         u_char *buf, *p;
2527         u_long magic;
2528
2529         len -= 4;
2530         buf = malloc (len, M_TEMP, M_NOWAIT);
2531         if (!buf)
2532                 return;
2533
2534         if (debug)
2535                 log(LOG_DEBUG, SPP_FMT "lcp nak opts: ",
2536                     SPP_ARGS(ifp));
2537
2538         p = (void*) (h+1);
2539         for (; len > 1 && p[1]; len -= p[1], p += p[1]) {
2540                 if (debug)
2541                         addlog(" %s ", sppp_lcp_opt_name(*p));
2542                 switch (*p) {
2543                 case LCP_OPT_MAGIC:
2544                         /* Magic number -- renegotiate */
2545                         if ((sp->lcp.opts & (1 << LCP_OPT_MAGIC)) &&
2546                             len >= 6 && p[1] == 6) {
2547                                 magic = (u_long)p[2] << 24 |
2548                                         (u_long)p[3] << 16 | p[4] << 8 | p[5];
2549                                 /*
2550                                  * If the remote magic is our negated one,
2551                                  * this looks like a loopback problem.
2552                                  * Suggest a new magic to make sure.
2553                                  */
2554                                 if (magic == ~sp->lcp.magic) {
2555                                         if (debug)
2556                                                 addlog("magic glitch ");
2557 #if defined(__FreeBSD__) && __FreeBSD__ >= 3
2558                                         sp->lcp.magic = random();
2559 #else
2560                                         sp->lcp.magic = time.tv_sec + time.tv_usec;
2561 #endif
2562                                 } else {
2563                                         sp->lcp.magic = magic;
2564                                         if (debug)
2565                                                 addlog("%lu ", magic);
2566                                 }
2567                         }
2568                         break;
2569                 case LCP_OPT_MRU:
2570                         /*
2571                          * Peer wants to advise us to negotiate an MRU.
2572                          * Agree on it if it's reasonable, or use
2573                          * default otherwise.
2574                          */
2575                         if (len >= 4 && p[1] == 4) {
2576                                 u_int mru = p[2] * 256 + p[3];
2577                                 if (debug)
2578                                         addlog("%d ", mru);
2579                                 if (mru < PP_MTU || mru > PP_MAX_MRU)
2580                                         mru = PP_MTU;
2581                                 sp->lcp.mru = mru;
2582                                 sp->lcp.opts |= (1 << LCP_OPT_MRU);
2583                         }
2584                         break;
2585                 case LCP_OPT_AUTH_PROTO:
2586                         /*
2587                          * Peer doesn't like our authentication method,
2588                          * deny.
2589                          */
2590                         if (debug)
2591                                 addlog("[access denied]\n");
2592                         lcp.Close(sp);
2593                         break;
2594                 }
2595         }
2596         if (debug)
2597                 addlog("\n");
2598         free (buf, M_TEMP);
2599         return;
2600 }
2601
2602 static void
2603 sppp_lcp_tlu(struct sppp *sp)
2604 {
2605         STDDCL;
2606         int i;
2607         u_long mask;
2608
2609         /* XXX ? */
2610         if (! (ifp->if_flags & IFF_UP) &&
2611             (ifp->if_flags & IFF_RUNNING)) {
2612                 /* Coming out of loopback mode. */
2613                 if_up(ifp);
2614                 printf (SPP_FMT "up\n", SPP_ARGS(ifp));
2615         }
2616
2617         for (i = 0; i < IDX_COUNT; i++)
2618                 if ((cps[i])->flags & CP_QUAL)
2619                         (cps[i])->Open(sp);
2620
2621         if ((sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0 ||
2622             (sp->pp_flags & PP_NEEDAUTH) != 0)
2623                 sp->pp_phase = PHASE_AUTHENTICATE;
2624         else
2625                 sp->pp_phase = PHASE_NETWORK;
2626
2627         if (debug)
2628                 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
2629                     sppp_phase_name(sp->pp_phase));
2630
2631         /*
2632          * Open all authentication protocols.  This is even required
2633          * if we already proceeded to network phase, since it might be
2634          * that remote wants us to authenticate, so we might have to
2635          * send a PAP request.  Undesired authentication protocols
2636          * don't do anything when they get an Open event.
2637          */
2638         for (i = 0; i < IDX_COUNT; i++)
2639                 if ((cps[i])->flags & CP_AUTH)
2640                         (cps[i])->Open(sp);
2641
2642         if (sp->pp_phase == PHASE_NETWORK) {
2643                 /* Notify all NCPs. */
2644                 for (i = 0; i < IDX_COUNT; i++)
2645                         if (((cps[i])->flags & CP_NCP) &&
2646                             /*
2647                              * XXX
2648                              * Hack to administratively disable IPv6 if
2649                              * not desired.  Perhaps we should have another
2650                              * flag for this, but right now, we can make
2651                              * all struct cp's read/only.
2652                              */
2653                             (cps[i] != &ipv6cp ||
2654                              (sp->confflags & CONF_ENABLE_IPV6)))
2655                                 (cps[i])->Open(sp);
2656         }
2657
2658         /* Send Up events to all started protos. */
2659         for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
2660                 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0)
2661                         (cps[i])->Up(sp);
2662
2663         /* notify low-level driver of state change */
2664         if (sp->pp_chg)
2665                 sp->pp_chg(sp, (int)sp->pp_phase);
2666         
2667         if (sp->pp_phase == PHASE_NETWORK)
2668                 /* if no NCP is starting, close down */
2669                 sppp_lcp_check_and_close(sp);
2670 }
2671
2672 static void
2673 sppp_lcp_tld(struct sppp *sp)
2674 {
2675         STDDCL;
2676         int i;
2677         u_long mask;
2678
2679         sp->pp_phase = PHASE_TERMINATE;
2680
2681         if (debug)
2682                 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
2683                     sppp_phase_name(sp->pp_phase));
2684
2685         /*
2686          * Take upper layers down.  We send the Down event first and
2687          * the Close second to prevent the upper layers from sending
2688          * ``a flurry of terminate-request packets'', as the RFC
2689          * describes it.
2690          */
2691         for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
2692                 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0) {
2693                         (cps[i])->Down(sp);
2694                         (cps[i])->Close(sp);
2695                 }
2696 }
2697
2698 static void
2699 sppp_lcp_tls(struct sppp *sp)
2700 {
2701         STDDCL;
2702
2703         sp->pp_phase = PHASE_ESTABLISH;
2704
2705         if (debug)
2706                 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
2707                     sppp_phase_name(sp->pp_phase));
2708
2709         /* Notify lower layer if desired. */
2710         if (sp->pp_tls)
2711                 (sp->pp_tls)(sp);
2712         else
2713                 (sp->pp_up)(sp);
2714 }
2715
2716 static void
2717 sppp_lcp_tlf(struct sppp *sp)
2718 {
2719         STDDCL;
2720
2721         sp->pp_phase = PHASE_DEAD;
2722         if (debug)
2723                 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
2724                     sppp_phase_name(sp->pp_phase));
2725
2726         /* Notify lower layer if desired. */
2727         if (sp->pp_tlf)
2728                 (sp->pp_tlf)(sp);
2729         else
2730                 (sp->pp_down)(sp);
2731 }
2732
2733 static void
2734 sppp_lcp_scr(struct sppp *sp)
2735 {
2736         char opt[6 /* magicnum */ + 4 /* mru */ + 5 /* chap */];
2737         int i = 0;
2738         u_short authproto;
2739
2740         if (sp->lcp.opts & (1 << LCP_OPT_MAGIC)) {
2741                 if (! sp->lcp.magic)
2742 #if defined(__FreeBSD__) && __FreeBSD__ >= 3
2743                         sp->lcp.magic = random();
2744 #else
2745                         sp->lcp.magic = time.tv_sec + time.tv_usec;
2746 #endif
2747                 opt[i++] = LCP_OPT_MAGIC;
2748                 opt[i++] = 6;
2749                 opt[i++] = sp->lcp.magic >> 24;
2750                 opt[i++] = sp->lcp.magic >> 16;
2751                 opt[i++] = sp->lcp.magic >> 8;
2752                 opt[i++] = sp->lcp.magic;
2753         }
2754
2755         if (sp->lcp.opts & (1 << LCP_OPT_MRU)) {
2756                 opt[i++] = LCP_OPT_MRU;
2757                 opt[i++] = 4;
2758                 opt[i++] = sp->lcp.mru >> 8;
2759                 opt[i++] = sp->lcp.mru;
2760         }
2761
2762         if (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) {
2763                 authproto = sp->hisauth.proto;
2764                 opt[i++] = LCP_OPT_AUTH_PROTO;
2765                 opt[i++] = authproto == PPP_CHAP? 5: 4;
2766                 opt[i++] = authproto >> 8;
2767                 opt[i++] = authproto;
2768                 if (authproto == PPP_CHAP)
2769                         opt[i++] = CHAP_MD5;
2770         }
2771
2772         sp->confid[IDX_LCP] = ++sp->pp_seq[IDX_LCP];
2773         sppp_cp_send (sp, PPP_LCP, CONF_REQ, sp->confid[IDX_LCP], i, &opt);
2774 }
2775
2776 /*
2777  * Check the open NCPs, return true if at least one NCP is open.
2778  */
2779 static int
2780 sppp_ncp_check(struct sppp *sp)
2781 {
2782         int i, mask;
2783
2784         for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
2785                 if ((sp->lcp.protos & mask) && (cps[i])->flags & CP_NCP)
2786                         return 1;
2787         return 0;
2788 }
2789
2790 /*
2791  * Re-check the open NCPs and see if we should terminate the link.
2792  * Called by the NCPs during their tlf action handling.
2793  */
2794 static void
2795 sppp_lcp_check_and_close(struct sppp *sp)
2796 {
2797
2798         if (sp->pp_phase < PHASE_NETWORK)
2799                 /* don't bother, we are already going down */
2800                 return;
2801
2802         if (sppp_ncp_check(sp))
2803                 return;
2804
2805         lcp.Close(sp);
2806 }
2807
2808 /*
2809  *--------------------------------------------------------------------------*
2810  *                                                                          *
2811  *                        The IPCP implementation.                          *
2812  *                                                                          *
2813  *--------------------------------------------------------------------------*
2814  */
2815
2816 static void
2817 sppp_ipcp_init(struct sppp *sp)
2818 {
2819         sp->ipcp.opts = 0;
2820         sp->ipcp.flags = 0;
2821         sp->state[IDX_IPCP] = STATE_INITIAL;
2822         sp->fail_counter[IDX_IPCP] = 0;
2823         sp->pp_seq[IDX_IPCP] = 0;
2824         sp->pp_rseq[IDX_IPCP] = 0;
2825 #if defined(__FreeBSD__) && __FreeBSD__ >= 3
2826         callout_handle_init(&sp->ch[IDX_IPCP]);
2827 #endif
2828 }
2829
2830 static void
2831 sppp_ipcp_up(struct sppp *sp)
2832 {
2833         sppp_up_event(&ipcp, sp);
2834 }
2835
2836 static void
2837 sppp_ipcp_down(struct sppp *sp)
2838 {
2839         sppp_down_event(&ipcp, sp);
2840 }
2841
2842 static void
2843 sppp_ipcp_open(struct sppp *sp)
2844 {
2845         STDDCL;
2846         u_long myaddr, hisaddr;
2847
2848         sp->ipcp.flags &= ~(IPCP_HISADDR_SEEN | IPCP_MYADDR_SEEN |
2849                             IPCP_MYADDR_DYN | IPCP_VJ);
2850         sp->ipcp.opts = 0;
2851
2852         sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0);
2853         /*
2854          * If we don't have his address, this probably means our
2855          * interface doesn't want to talk IP at all.  (This could
2856          * be the case if somebody wants to speak only IPX, for
2857          * example.)  Don't open IPCP in this case.
2858          */
2859         if (hisaddr == 0L) {
2860                 /* XXX this message should go away */
2861                 if (debug)
2862                         log(LOG_DEBUG, SPP_FMT "ipcp_open(): no IP interface\n",
2863                             SPP_ARGS(ifp));
2864                 return;
2865         }
2866         if (myaddr == 0L) {
2867                 /*
2868                  * I don't have an assigned address, so i need to
2869                  * negotiate my address.
2870                  */
2871                 sp->ipcp.flags |= IPCP_MYADDR_DYN;
2872                 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS);
2873         } else
2874                 sp->ipcp.flags |= IPCP_MYADDR_SEEN;
2875         if (sp->confflags & CONF_ENABLE_VJ) {
2876                 sp->ipcp.opts |= (1 << IPCP_OPT_COMPRESSION);
2877                 sp->ipcp.max_state = MAX_STATES - 1;
2878                 sp->ipcp.compress_cid = 1;
2879         }
2880         sppp_open_event(&ipcp, sp);
2881 }
2882
2883 static void
2884 sppp_ipcp_close(struct sppp *sp)
2885 {
2886         sppp_close_event(&ipcp, sp);
2887         if (sp->ipcp.flags & IPCP_MYADDR_DYN)
2888                 /*
2889                  * My address was dynamic, clear it again.
2890                  */
2891                 sppp_set_ip_addr(sp, 0L);
2892 }
2893
2894 static void
2895 sppp_ipcp_TO(void *cookie)
2896 {
2897         sppp_to_event(&ipcp, (struct sppp *)cookie);
2898 }
2899
2900 /*
2901  * Analyze a configure request.  Return true if it was agreeable, and
2902  * caused action sca, false if it has been rejected or nak'ed, and
2903  * caused action scn.  (The return value is used to make the state
2904  * transition decision in the state automaton.)
2905  */
2906 static int
2907 sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len)
2908 {
2909         u_char *buf, *r, *p;
2910         struct ifnet *ifp = &sp->pp_if;
2911         int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG;
2912         u_long hisaddr, desiredaddr;
2913         int gotmyaddr = 0;
2914         int desiredcomp;
2915
2916         len -= 4;
2917         origlen = len;
2918         /*
2919          * Make sure to allocate a buf that can at least hold a
2920          * conf-nak with an `address' option.  We might need it below.
2921          */
2922         buf = r = malloc ((len < 6? 6: len), M_TEMP, M_NOWAIT);
2923         if (! buf)
2924                 return (0);
2925
2926         /* pass 1: see if we can recognize them */
2927         if (debug)
2928                 log(LOG_DEBUG, SPP_FMT "ipcp parse opts: ",
2929                     SPP_ARGS(ifp));
2930         p = (void*) (h+1);
2931         for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) {
2932                 if (debug)
2933                         addlog(" %s ", sppp_ipcp_opt_name(*p));
2934                 switch (*p) {
2935                 case IPCP_OPT_COMPRESSION:
2936                         if (!(sp->confflags & CONF_ENABLE_VJ)) {
2937                                 /* VJ compression administratively disabled */
2938                                 if (debug)
2939                                         addlog("[locally disabled] ");
2940                                 break;
2941                         }
2942                         /*
2943                          * In theory, we should only conf-rej an
2944                          * option that is shorter than RFC 1618
2945                          * requires (i.e. < 4), and should conf-nak
2946                          * anything else that is not VJ.  However,
2947                          * since our algorithm always uses the
2948                          * original option to NAK it with new values,
2949                          * things would become more complicated.  In
2950                          * pratice, the only commonly implemented IP
2951                          * compression option is VJ anyway, so the
2952                          * difference is negligible.
2953                          */
2954                         if (len >= 6 && p[1] == 6) {
2955                                 /*
2956                                  * correctly formed compression option
2957                                  * that could be VJ compression
2958                                  */
2959                                 continue;
2960                         }
2961                         if (debug)
2962                                 addlog("optlen %d [invalid/unsupported] ",
2963                                     p[1]);
2964                         break;
2965                 case IPCP_OPT_ADDRESS:
2966                         if (len >= 6 && p[1] == 6) {
2967                                 /* correctly formed address option */
2968                                 continue;
2969                         }
2970                         if (debug)
2971                                 addlog("[invalid] ");
2972                         break;
2973                 default:
2974                         /* Others not supported. */
2975                         if (debug)
2976                                 addlog("[rej] ");
2977                         break;
2978                 }
2979                 /* Add the option to rejected list. */
2980                 bcopy (p, r, p[1]);
2981                 r += p[1];
2982                 rlen += p[1];
2983         }
2984         if (rlen) {
2985                 if (debug)
2986                         addlog(" send conf-rej\n");
2987                 sppp_cp_send (sp, PPP_IPCP, CONF_REJ, h->ident, rlen, buf);
2988                 return 0;
2989         } else if (debug)
2990                 addlog("\n");
2991
2992         /* pass 2: parse option values */
2993         sppp_get_ip_addrs(sp, 0, &hisaddr, 0);
2994         if (debug)
2995                 log(LOG_DEBUG, SPP_FMT "ipcp parse opt values: ",
2996                        SPP_ARGS(ifp));
2997         p = (void*) (h+1);
2998         len = origlen;
2999         for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) {
3000                 if (debug)
3001                         addlog(" %s ", sppp_ipcp_opt_name(*p));
3002                 switch (*p) {
3003                 case IPCP_OPT_COMPRESSION:
3004                         desiredcomp = p[2] << 8 | p[3];
3005                         /* We only support VJ */
3006                         if (desiredcomp == IPCP_COMP_VJ) {
3007                                 if (debug)
3008                                         addlog("VJ [ack] ");
3009                                 sp->ipcp.flags |= IPCP_VJ;
3010                                 sl_compress_init(sp->pp_comp, p[4]);
3011                                 sp->ipcp.max_state = p[4];
3012                                 sp->ipcp.compress_cid = p[5];
3013                                 continue;
3014                         }
3015                         if (debug)
3016                                 addlog("compproto %#04x [not supported] ",
3017                                     desiredcomp);
3018                         p[2] = IPCP_COMP_VJ >> 8;
3019                         p[3] = IPCP_COMP_VJ;
3020                         p[4] = sp->ipcp.max_state;
3021                         p[5] = sp->ipcp.compress_cid;
3022                         break;
3023                 case IPCP_OPT_ADDRESS:
3024                         /* This is the address he wants in his end */
3025                         desiredaddr = p[2] << 24 | p[3] << 16 |
3026                                 p[4] << 8 | p[5];
3027                         if (desiredaddr == hisaddr ||
3028                             (hisaddr >= 1 && hisaddr <= 254 && desiredaddr != 0)) {
3029                                 /*
3030                                  * Peer's address is same as our value,
3031                                  * or we have set it to 0.0.0.* to
3032                                  * indicate that we do not really care,
3033                                  * this is agreeable.  Gonna conf-ack
3034                                  * it.
3035                                  */
3036                                 if (debug)
3037                                         addlog("%s [ack] ",
3038                                                 sppp_dotted_quad(hisaddr));
3039                                 /* record that we've seen it already */
3040                                 sp->ipcp.flags |= IPCP_HISADDR_SEEN;
3041                                 continue;
3042                         }
3043                         /*
3044                          * The address wasn't agreeable.  This is either
3045                          * he sent us 0.0.0.0, asking to assign him an
3046                          * address, or he send us another address not
3047                          * matching our value.  Either case, we gonna
3048                          * conf-nak it with our value.
3049                          * XXX: we should "rej" if hisaddr == 0
3050                          */
3051                         if (debug) {
3052                                 if (desiredaddr == 0)
3053                                         addlog("[addr requested] ");
3054                                 else
3055                                         addlog("%s [not agreed] ",
3056                                                 sppp_dotted_quad(desiredaddr));
3057
3058                         }
3059                         p[2] = hisaddr >> 24;
3060                         p[3] = hisaddr >> 16;
3061                         p[4] = hisaddr >> 8;
3062                         p[5] = hisaddr;
3063                         break;
3064                 }
3065                 /* Add the option to nak'ed list. */
3066                 bcopy (p, r, p[1]);
3067                 r += p[1];
3068                 rlen += p[1];
3069         }
3070
3071         /*
3072          * If we are about to conf-ack the request, but haven't seen
3073          * his address so far, gonna conf-nak it instead, with the
3074          * `address' option present and our idea of his address being
3075          * filled in there, to request negotiation of both addresses.
3076          *
3077          * XXX This can result in an endless req - nak loop if peer
3078          * doesn't want to send us his address.  Q: What should we do
3079          * about it?  XXX  A: implement the max-failure counter.
3080          */
3081         if (rlen == 0 && !(sp->ipcp.flags & IPCP_HISADDR_SEEN) && !gotmyaddr) {
3082                 buf[0] = IPCP_OPT_ADDRESS;
3083                 buf[1] = 6;
3084                 buf[2] = hisaddr >> 24;
3085                 buf[3] = hisaddr >> 16;
3086                 buf[4] = hisaddr >> 8;
3087                 buf[5] = hisaddr;
3088                 rlen = 6;
3089                 if (debug)
3090                         addlog("still need hisaddr ");
3091         }
3092
3093         if (rlen) {
3094                 if (debug)
3095                         addlog(" send conf-nak\n");
3096                 sppp_cp_send (sp, PPP_IPCP, CONF_NAK, h->ident, rlen, buf);
3097         } else {
3098                 if (debug)
3099                         addlog(" send conf-ack\n");
3100                 sppp_cp_send (sp, PPP_IPCP, CONF_ACK,
3101                               h->ident, origlen, h+1);
3102         }
3103
3104         free (buf, M_TEMP);
3105         return (rlen == 0);
3106 }
3107
3108 /*
3109  * Analyze the IPCP Configure-Reject option list, and adjust our
3110  * negotiation.
3111  */
3112 static void
3113 sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
3114 {
3115         u_char *buf, *p;
3116         struct ifnet *ifp = &sp->pp_if;
3117         int debug = ifp->if_flags & IFF_DEBUG;
3118
3119         len -= 4;
3120         buf = malloc (len, M_TEMP, M_NOWAIT);
3121         if (!buf)
3122                 return;
3123
3124         if (debug)
3125                 log(LOG_DEBUG, SPP_FMT "ipcp rej opts: ",
3126                     SPP_ARGS(ifp));
3127
3128         p = (void*) (h+1);
3129         for (; len > 1 && p[1]; len -= p[1], p += p[1]) {
3130                 if (debug)
3131                         addlog(" %s ", sppp_ipcp_opt_name(*p));
3132                 switch (*p) {
3133                 case IPCP_OPT_COMPRESSION:
3134                         sp->ipcp.opts &= ~(1 << IPCP_OPT_COMPRESSION);
3135                         break;
3136                 case IPCP_OPT_ADDRESS:
3137                         /*
3138                          * Peer doesn't grok address option.  This is
3139                          * bad.  XXX  Should we better give up here?
3140                          * XXX We could try old "addresses" option...
3141                          */
3142                         sp->ipcp.opts &= ~(1 << IPCP_OPT_ADDRESS);
3143                         break;
3144                 }
3145         }
3146         if (debug)
3147                 addlog("\n");
3148         free (buf, M_TEMP);
3149         return;
3150 }
3151
3152 /*
3153  * Analyze the IPCP Configure-NAK option list, and adjust our
3154  * negotiation.
3155  */
3156 static void
3157 sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
3158 {
3159         u_char *buf, *p;
3160         struct ifnet *ifp = &sp->pp_if;
3161         int debug = ifp->if_flags & IFF_DEBUG;
3162         int desiredcomp;
3163         u_long wantaddr;
3164
3165         len -= 4;
3166         buf = malloc (len, M_TEMP, M_NOWAIT);
3167         if (!buf)
3168                 return;
3169
3170         if (debug)
3171                 log(LOG_DEBUG, SPP_FMT "ipcp nak opts: ",
3172                     SPP_ARGS(ifp));
3173
3174         p = (void*) (h+1);
3175         for (; len > 1 && p[1]; len -= p[1], p += p[1]) {
3176                 if (debug)
3177                         addlog(" %s ", sppp_ipcp_opt_name(*p));
3178                 switch (*p) {
3179                 case IPCP_OPT_COMPRESSION:
3180                         if (len >= 6 && p[1] == 6) {
3181                                 desiredcomp = p[2] << 8 | p[3];
3182                                 if (debug)
3183                                         addlog("[wantcomp %#04x] ",
3184                                                 desiredcomp);
3185                                 if (desiredcomp == IPCP_COMP_VJ) {
3186                                         sl_compress_init(sp->pp_comp, p[4]);
3187                                         sp->ipcp.max_state = p[4];
3188                                         sp->ipcp.compress_cid = p[5];
3189                                         if (debug)
3190                                                 addlog("[agree] ");
3191                                 } else
3192                                         sp->ipcp.opts &=
3193                                                 ~(1 << IPCP_OPT_COMPRESSION);
3194                         }
3195                         break;
3196                 case IPCP_OPT_ADDRESS:
3197                         /*
3198                          * Peer doesn't like our local IP address.  See
3199                          * if we can do something for him.  We'll drop
3200                          * him our address then.
3201                          */
3202                         if (len >= 6 && p[1] == 6) {
3203                                 wantaddr = p[2] << 24 | p[3] << 16 |
3204                                         p[4] << 8 | p[5];
3205                                 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS);
3206                                 if (debug)
3207                                         addlog("[wantaddr %s] ",
3208                                                sppp_dotted_quad(wantaddr));
3209                                 /*
3210                                  * When doing dynamic address assignment,
3211                                  * we accept his offer.  Otherwise, we
3212                                  * ignore it and thus continue to negotiate
3213                                  * our already existing value.
3214                                  * XXX: Bogus, if he said no once, he'll
3215                                  * just say no again, might as well die.
3216                                  */
3217                                 if (sp->ipcp.flags & IPCP_MYADDR_DYN) {
3218                                         sppp_set_ip_addr(sp, wantaddr);
3219                                         if (debug)
3220                                                 addlog("[agree] ");
3221                                         sp->ipcp.flags |= IPCP_MYADDR_SEEN;
3222                                 }
3223                         }
3224                         break;
3225                 }
3226         }
3227         if (debug)
3228                 addlog("\n");
3229         free (buf, M_TEMP);
3230         return;
3231 }
3232
3233 static void
3234 sppp_ipcp_tlu(struct sppp *sp)
3235 {
3236         /* we are up - notify isdn daemon */
3237         if (sp->pp_con)
3238                 sp->pp_con(sp);
3239 }
3240
3241 static void
3242 sppp_ipcp_tld(struct sppp *sp)
3243 {
3244 }
3245
3246 static void
3247 sppp_ipcp_tls(struct sppp *sp)
3248 {
3249         /* indicate to LCP that it must stay alive */
3250         sp->lcp.protos |= (1 << IDX_IPCP);
3251 }
3252
3253 static void
3254 sppp_ipcp_tlf(struct sppp *sp)
3255 {
3256         /* we no longer need LCP */
3257         sp->lcp.protos &= ~(1 << IDX_IPCP);
3258         sppp_lcp_check_and_close(sp);
3259 }
3260
3261 static void
3262 sppp_ipcp_scr(struct sppp *sp)
3263 {
3264         char opt[6 /* compression */ + 6 /* address */];
3265         u_long ouraddr;
3266         int i = 0;
3267
3268         if (sp->ipcp.opts & (1 << IPCP_OPT_COMPRESSION)) {
3269                 opt[i++] = IPCP_OPT_COMPRESSION;
3270                 opt[i++] = 6;
3271                 opt[i++] = IPCP_COMP_VJ >> 8;
3272                 opt[i++] = IPCP_COMP_VJ;
3273                 opt[i++] = sp->ipcp.max_state;
3274                 opt[i++] = sp->ipcp.compress_cid;
3275         }
3276         if (sp->ipcp.opts & (1 << IPCP_OPT_ADDRESS)) {
3277                 sppp_get_ip_addrs(sp, &ouraddr, 0, 0);
3278                 opt[i++] = IPCP_OPT_ADDRESS;
3279                 opt[i++] = 6;
3280                 opt[i++] = ouraddr >> 24;
3281                 opt[i++] = ouraddr >> 16;
3282                 opt[i++] = ouraddr >> 8;
3283                 opt[i++] = ouraddr;
3284         }
3285
3286         sp->confid[IDX_IPCP] = ++sp->pp_seq[IDX_IPCP];
3287         sppp_cp_send(sp, PPP_IPCP, CONF_REQ, sp->confid[IDX_IPCP], i, &opt);
3288 }
3289
3290 /*
3291  *--------------------------------------------------------------------------*
3292  *                                                                          *
3293  *                      The IPv6CP implementation.                          *
3294  *                                                                          *
3295  *--------------------------------------------------------------------------*
3296  */
3297
3298 #ifdef INET6
3299 static void
3300 sppp_ipv6cp_init(struct sppp *sp)
3301 {
3302         sp->ipv6cp.opts = 0;
3303         sp->ipv6cp.flags = 0;
3304         sp->state[IDX_IPV6CP] = STATE_INITIAL;
3305         sp->fail_counter[IDX_IPV6CP] = 0;
3306         sp->pp_seq[IDX_IPV6CP] = 0;
3307         sp->pp_rseq[IDX_IPV6CP] = 0;
3308 #if defined(__NetBSD__)
3309         callout_init(&sp->ch[IDX_IPV6CP]);
3310 #endif
3311 #if defined(__FreeBSD__) && __FreeBSD__ >= 3
3312         callout_handle_init(&sp->ch[IDX_IPV6CP]);
3313 #endif
3314 }
3315
3316 static void
3317 sppp_ipv6cp_up(struct sppp *sp)
3318 {
3319         sppp_up_event(&ipv6cp, sp);
3320 }
3321
3322 static void
3323 sppp_ipv6cp_down(struct sppp *sp)
3324 {
3325         sppp_down_event(&ipv6cp, sp);
3326 }
3327
3328 static void
3329 sppp_ipv6cp_open(struct sppp *sp)
3330 {
3331         STDDCL;
3332         struct in6_addr myaddr, hisaddr;
3333
3334 #ifdef IPV6CP_MYIFID_DYN
3335         sp->ipv6cp.flags &= ~(IPV6CP_MYIFID_SEEN|IPV6CP_MYIFID_DYN);
3336 #else
3337         sp->ipv6cp.flags &= ~IPV6CP_MYIFID_SEEN;
3338 #endif
3339
3340         sppp_get_ip6_addrs(sp, &myaddr, &hisaddr, 0);
3341         /*
3342          * If we don't have our address, this probably means our
3343          * interface doesn't want to talk IPv6 at all.  (This could
3344          * be the case if somebody wants to speak only IPX, for
3345          * example.)  Don't open IPv6CP in this case.
3346          */
3347         if (IN6_IS_ADDR_UNSPECIFIED(&myaddr)) {
3348                 /* XXX this message should go away */
3349                 if (debug)
3350                         log(LOG_DEBUG, SPP_FMT "ipv6cp_open(): no IPv6 interface\n",
3351                             SPP_ARGS(ifp));
3352                 return;
3353         }
3354
3355         sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN;
3356         sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID);
3357         sppp_open_event(&ipv6cp, sp);
3358 }
3359
3360 static void
3361 sppp_ipv6cp_close(struct sppp *sp)
3362 {
3363         sppp_close_event(&ipv6cp, sp);
3364 }
3365
3366 static void
3367 sppp_ipv6cp_TO(void *cookie)
3368 {
3369         sppp_to_event(&ipv6cp, (struct sppp *)cookie);
3370 }
3371
3372 /*
3373  * Analyze a configure request.  Return true if it was agreeable, and
3374  * caused action sca, false if it has been rejected or nak'ed, and
3375  * caused action scn.  (The return value is used to make the state
3376  * transition decision in the state automaton.)
3377  */
3378 static int
3379 sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len)
3380 {
3381         u_char *buf, *r, *p;
3382         struct ifnet *ifp = &sp->pp_if;
3383         int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG;
3384         struct in6_addr myaddr, desiredaddr, suggestaddr;
3385         int ifidcount;
3386         int type;
3387         int collision, nohisaddr;
3388
3389         len -= 4;
3390         origlen = len;
3391         /*
3392          * Make sure to allocate a buf that can at least hold a
3393          * conf-nak with an `address' option.  We might need it below.
3394          */
3395         buf = r = malloc ((len < 6? 6: len), M_TEMP, M_NOWAIT);
3396         if (! buf)
3397                 return (0);
3398
3399         /* pass 1: see if we can recognize them */
3400         if (debug)
3401                 log(LOG_DEBUG, SPP_FMT "ipv6cp parse opts:",
3402                     SPP_ARGS(ifp));
3403         p = (void*) (h+1);
3404         ifidcount = 0;
3405         for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) {
3406                 if (debug)
3407                         addlog(" %s", sppp_ipv6cp_opt_name(*p));
3408                 switch (*p) {
3409                 case IPV6CP_OPT_IFID:
3410                         if (len >= 10 && p[1] == 10 && ifidcount == 0) {
3411                                 /* correctly formed address option */
3412                                 ifidcount++;
3413                                 continue;
3414                         }
3415                         if (debug)
3416                                 addlog(" [invalid]");
3417                         break;
3418 #ifdef notyet
3419                 case IPV6CP_OPT_COMPRESSION:
3420                         if (len >= 4 && p[1] >= 4) {
3421                                 /* correctly formed compress option */
3422                                 continue;
3423                         }
3424                         if (debug)
3425                                 addlog(" [invalid]");
3426                         break;
3427 #endif
3428                 default:
3429                         /* Others not supported. */
3430                         if (debug)
3431                                 addlog(" [rej]");
3432                         break;
3433                 }
3434                 /* Add the option to rejected list. */
3435                 bcopy (p, r, p[1]);
3436                 r += p[1];
3437                 rlen += p[1];
3438         }
3439         if (rlen) {
3440                 if (debug)
3441                         addlog(" send conf-rej\n");
3442                 sppp_cp_send (sp, PPP_IPV6CP, CONF_REJ, h->ident, rlen, buf);
3443                 goto end;
3444         } else if (debug)
3445                 addlog("\n");
3446
3447         /* pass 2: parse option values */
3448         sppp_get_ip6_addrs(sp, &myaddr, 0, 0);
3449         if (debug)
3450                 log(LOG_DEBUG, SPP_FMT "ipv6cp parse opt values: ",
3451                     SPP_ARGS(ifp));
3452         p = (void*) (h+1);
3453         len = origlen;
3454         type = CONF_ACK;
3455         for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) {
3456                 if (debug)
3457                         addlog(" %s", sppp_ipv6cp_opt_name(*p));
3458                 switch (*p) {
3459 #ifdef notyet
3460                 case IPV6CP_OPT_COMPRESSION:
3461                         continue;
3462 #endif
3463                 case IPV6CP_OPT_IFID:
3464                         bzero(&desiredaddr, sizeof(desiredaddr));
3465                         bcopy(&p[2], &desiredaddr.s6_addr[8], 8);
3466                         collision = (bcmp(&desiredaddr.s6_addr[8],
3467                                           &myaddr.s6_addr[8], 8) == 0);
3468                         nohisaddr = IN6_IS_ADDR_UNSPECIFIED(&desiredaddr);
3469
3470                         desiredaddr.s6_addr16[0] = htons(0xfe80);
3471                         desiredaddr.s6_addr16[1] = htons(sp->pp_if.if_index);
3472
3473                         if (!collision && !nohisaddr) {
3474                                 /* no collision, hisaddr known - Conf-Ack */
3475                                 type = CONF_ACK;
3476
3477                                 if (debug) {
3478                                         addlog(" %s [%s]",
3479                                                ip6_sprintf(&desiredaddr),
3480                                                sppp_cp_type_name(type));
3481                                 }
3482                                 continue;
3483                         }
3484
3485                         bzero(&suggestaddr, sizeof(&suggestaddr));
3486                         if (collision && nohisaddr) {
3487                                 /* collision, hisaddr unknown - Conf-Rej */
3488                                 type = CONF_REJ;
3489                                 bzero(&p[2], 8);
3490                         } else {
3491                                 /*
3492                                  * - no collision, hisaddr unknown, or
3493                                  * - collision, hisaddr known
3494                                  * Conf-Nak, suggest hisaddr
3495                                  */
3496                                 type = CONF_NAK;
3497                                 sppp_suggest_ip6_addr(sp, &suggestaddr);
3498                                 bcopy(&suggestaddr.s6_addr[8], &p[2], 8);
3499                         }
3500                         if (debug)
3501                                 addlog(" %s [%s]", ip6_sprintf(&desiredaddr),
3502                                        sppp_cp_type_name(type));
3503                         break;
3504                 }
3505                 /* Add the option to nak'ed list. */
3506                 bcopy (p, r, p[1]);
3507                 r += p[1];
3508                 rlen += p[1];
3509         }
3510
3511         if (rlen == 0 && type == CONF_ACK) {
3512                 if (debug)
3513                         addlog(" send %s\n", sppp_cp_type_name(type));
3514                 sppp_cp_send (sp, PPP_IPV6CP, type, h->ident, origlen, h+1);
3515         } else {
3516 #ifdef DIAGNOSTIC
3517                 if (type == CONF_ACK)
3518                         panic("IPv6CP RCR: CONF_ACK with non-zero rlen");
3519 #endif
3520
3521                 if (debug) {
3522                         addlog(" send %s suggest %s\n",
3523                                sppp_cp_type_name(type), ip6_sprintf(&suggestaddr));
3524                 }
3525                 sppp_cp_send (sp, PPP_IPV6CP, type, h->ident, rlen, buf);
3526         }
3527
3528  end:
3529         free (buf, M_TEMP);
3530         return (rlen == 0);
3531 }
3532
3533 /*
3534  * Analyze the IPv6CP Configure-Reject option list, and adjust our
3535  * negotiation.
3536  */
3537 static void
3538 sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
3539 {
3540         u_char *buf, *p;
3541         struct ifnet *ifp = &sp->pp_if;
3542         int debug = ifp->if_flags & IFF_DEBUG;
3543
3544         len -= 4;
3545         buf = malloc (len, M_TEMP, M_NOWAIT);
3546         if (!buf)
3547                 return;
3548
3549         if (debug)
3550                 log(LOG_DEBUG, SPP_FMT "ipv6cp rej opts:",
3551                     SPP_ARGS(ifp));
3552
3553         p = (void*) (h+1);
3554         for (; len > 1 && p[1]; len -= p[1], p += p[1]) {
3555                 if (debug)
3556                         addlog(" %s", sppp_ipv6cp_opt_name(*p));
3557                 switch (*p) {
3558                 case IPV6CP_OPT_IFID:
3559                         /*
3560                          * Peer doesn't grok address option.  This is
3561                          * bad.  XXX  Should we better give up here?
3562                          */
3563                         sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_IFID);
3564                         break;
3565 #ifdef notyet
3566                 case IPV6CP_OPT_COMPRESS:
3567                         sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_COMPRESS);
3568                         break;
3569 #endif
3570                 }
3571         }
3572         if (debug)
3573                 addlog("\n");
3574         free (buf, M_TEMP);
3575         return;
3576 }
3577
3578 /*
3579  * Analyze the IPv6CP Configure-NAK option list, and adjust our
3580  * negotiation.
3581  */
3582 static void
3583 sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
3584 {
3585         u_char *buf, *p;
3586         struct ifnet *ifp = &sp->pp_if;
3587         int debug = ifp->if_flags & IFF_DEBUG;
3588         struct in6_addr suggestaddr;
3589
3590         len -= 4;
3591         buf = malloc (len, M_TEMP, M_NOWAIT);
3592         if (!buf)
3593                 return;
3594
3595         if (debug)
3596                 log(LOG_DEBUG, SPP_FMT "ipv6cp nak opts:",
3597                     SPP_ARGS(ifp));
3598
3599         p = (void*) (h+1);
3600         for (; len > 1 && p[1]; len -= p[1], p += p[1]) {
3601                 if (debug)
3602                         addlog(" %s", sppp_ipv6cp_opt_name(*p));
3603                 switch (*p) {
3604                 case IPV6CP_OPT_IFID:
3605                         /*
3606                          * Peer doesn't like our local ifid.  See
3607                          * if we can do something for him.  We'll drop
3608                          * him our address then.
3609                          */
3610                         if (len < 10 || p[1] != 10)
3611                                 break;
3612                         bzero(&suggestaddr, sizeof(suggestaddr));
3613                         suggestaddr.s6_addr16[0] = htons(0xfe80);
3614                         suggestaddr.s6_addr16[1] = htons(sp->pp_if.if_index);
3615                         bcopy(&p[2], &suggestaddr.s6_addr[8], 8);
3616
3617                         sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID);
3618                         if (debug)
3619                                 addlog(" [suggestaddr %s]",
3620                                        ip6_sprintf(&suggestaddr));
3621 #ifdef IPV6CP_MYIFID_DYN
3622                         /*
3623                          * When doing dynamic address assignment,
3624                          * we accept his offer.
3625                          */
3626                         if (sp->ipv6cp.flags & IPV6CP_MYIFID_DYN) {
3627                                 struct in6_addr lastsuggest;
3628                                 /*
3629                                  * If <suggested myaddr from peer> equals to
3630                                  * <hisaddr we have suggested last time>,
3631                                  * we have a collision.  generate new random
3632                                  * ifid.
3633                                  */
3634                                 sppp_suggest_ip6_addr(&lastsuggest);
3635                                 if (IN6_ARE_ADDR_EQUAL(&suggestaddr,
3636                                                        lastsuggest)) {
3637                                         if (debug)
3638                                                 addlog(" [random]");
3639                                         sppp_gen_ip6_addr(sp, &suggestaddr);
3640                                 }
3641                                 sppp_set_ip6_addr(sp, &suggestaddr, 0);
3642                                 if (debug)
3643                                         addlog(" [agree]");
3644                                 sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN;
3645                         }
3646 #else
3647                         /*
3648                          * Since we do not do dynamic address assignment,
3649                          * we ignore it and thus continue to negotiate
3650                          * our already existing value.  This can possibly
3651                          * go into infinite request-reject loop.
3652                          *
3653                          * This is not likely because we normally use
3654                          * ifid based on MAC-address.
3655                          * If you have no ethernet card on the node, too bad.
3656                          * XXX should we use fail_counter?
3657                          */
3658 #endif
3659                         break;
3660 #ifdef notyet
3661                 case IPV6CP_OPT_COMPRESS:
3662                         /*
3663                          * Peer wants different compression parameters.
3664                          */
3665                         break;
3666 #endif
3667                 }
3668         }
3669         if (debug)
3670                 addlog("\n");
3671         free (buf, M_TEMP);
3672         return;
3673 }
3674 static void
3675 sppp_ipv6cp_tlu(struct sppp *sp)
3676 {
3677         /* we are up - notify isdn daemon */
3678         if (sp->pp_con)
3679                 sp->pp_con(sp);
3680 }
3681
3682 static void
3683 sppp_ipv6cp_tld(struct sppp *sp)
3684 {
3685 }
3686
3687 static void
3688 sppp_ipv6cp_tls(struct sppp *sp)
3689 {
3690         /* indicate to LCP that it must stay alive */
3691         sp->lcp.protos |= (1 << IDX_IPV6CP);
3692 }
3693
3694 static void
3695 sppp_ipv6cp_tlf(struct sppp *sp)
3696 {
3697
3698 #if 0   /* need #if 0 to close IPv6CP properly */
3699         /* we no longer need LCP */
3700         sp->lcp.protos &= ~(1 << IDX_IPV6CP);
3701         sppp_lcp_check_and_close(sp);
3702 #endif
3703 }
3704
3705 static void
3706 sppp_ipv6cp_scr(struct sppp *sp)
3707 {
3708         char opt[10 /* ifid */ + 4 /* compression, minimum */];
3709         struct in6_addr ouraddr;
3710         int i = 0;
3711
3712         if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_IFID)) {
3713                 sppp_get_ip6_addrs(sp, &ouraddr, 0, 0);
3714                 opt[i++] = IPV6CP_OPT_IFID;
3715                 opt[i++] = 10;
3716                 bcopy(&ouraddr.s6_addr[8], &opt[i], 8);
3717                 i += 8;
3718         }
3719
3720 #ifdef notyet
3721         if (sp->ipv6cp.opts & (1 << IPV6CP_OPT_COMPRESSION)) {
3722                 opt[i++] = IPV6CP_OPT_COMPRESSION;
3723                 opt[i++] = 4;
3724                 opt[i++] = 0;   /* TBD */
3725                 opt[i++] = 0;   /* TBD */
3726                 /* variable length data may follow */
3727         }
3728 #endif
3729
3730         sp->confid[IDX_IPV6CP] = ++sp->pp_seq[IDX_IPV6CP];
3731         sppp_cp_send(sp, PPP_IPV6CP, CONF_REQ, sp->confid[IDX_IPV6CP], i, &opt)