8af93ddc6e52dce6c6c1b4a81b928018d0a191c7
[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  */
22
23 #include <sys/param.h>
24
25 #if defined(__DragonFly__) 
26 #include "opt_inet.h"
27 #include "opt_inet6.h"
28 #include "opt_ipx.h"
29 #endif
30
31 #ifdef NetBSD1_3
32 #  if NetBSD1_3 > 6
33 #      include "opt_inet.h"
34 #      include "opt_inet6.h"
35 #      include "opt_iso.h"
36 #  endif
37 #endif
38
39 #include <sys/systm.h>
40 #include <sys/kernel.h>
41 #include <sys/module.h>
42 #include <sys/sockio.h>
43 #include <sys/socket.h>
44 #include <sys/syslog.h>
45 #if defined(__DragonFly__)
46 #include <sys/random.h>
47 #include <sys/thread2.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/ifq_var.h>
60 #include <net/netisr.h>
61 #include <net/if_types.h>
62 #include <net/route.h>
63 #include <netinet/in.h>
64 #include <netinet/in_systm.h>
65 #include <netinet/ip.h>
66 #include <net/slcompress.h>
67
68 #if defined (__NetBSD__) || defined (__OpenBSD__)
69 #include <machine/cpu.h> /* XXX for softnet */
70 #endif
71
72 #include <machine/stdarg.h>
73
74 #include <netinet/in.h>
75 #include <netinet/in_systm.h>
76 #include <netinet/in_var.h>
77
78 #ifdef INET
79 #include <netinet/ip.h>
80 #include <netinet/tcp.h>
81 #endif
82
83 #if defined (__DragonFly__) || defined (__OpenBSD__)
84 # include <netinet/if_ether.h>
85 #else
86 # include <net/ethertypes.h>
87 #endif
88
89 #ifdef IPX
90 #include <netproto/ipx/ipx.h>
91 #include <netproto/ipx/ipx_if.h>
92 #endif
93
94 #include "if_sppp.h"
95
96 #define IOCTL_CMD_T     u_long
97 #define MAXALIVECNT     3               /* max. alive packets */
98
99 /*
100  * Interface flags that can be set in an ifconfig command.
101  *
102  * Setting link0 will make the link passive, i.e. it will be marked
103  * as being administrative openable, but won't be opened to begin
104  * with.  Incoming calls will be answered, or subsequent calls with
105  * -link1 will cause the administrative open of the LCP layer.
106  *
107  * Setting link1 will cause the link to auto-dial only as packets
108  * arrive to be sent.
109  *
110  * Setting IFF_DEBUG will syslog the option negotiation and state
111  * transitions at level kern.debug.  Note: all logs consistently look
112  * like
113  *
114  *   <if-name><unit>: <proto-name> <additional info...>
115  *
116  * with <if-name><unit> being something like "bppp0", and <proto-name>
117  * being one of "lcp", "ipcp", "cisco", "chap", "pap", etc.
118  */
119
120 #define IFF_PASSIVE     IFF_LINK0       /* wait passively for connection */
121 #define IFF_AUTO        IFF_LINK1       /* auto-dial on output */
122 #define IFF_CISCO       IFF_LINK2       /* auto-dial on output */
123
124 #define PPP_ALLSTATIONS 0xff            /* All-Stations broadcast address */
125 #define PPP_UI          0x03            /* Unnumbered Information */
126 #define PPP_IP          0x0021          /* Internet Protocol */
127 #define PPP_ISO         0x0023          /* ISO OSI Protocol */
128 #define PPP_XNS         0x0025          /* Xerox NS Protocol */
129 #define PPP_IPX         0x002b          /* Novell IPX Protocol */
130 #define PPP_VJ_COMP     0x002d          /* VJ compressed TCP/IP */
131 #define PPP_VJ_UCOMP    0x002f          /* VJ uncompressed TCP/IP */
132 #define PPP_IPV6        0x0057          /* Internet Protocol Version 6 */
133 #define PPP_LCP         0xc021          /* Link Control Protocol */
134 #define PPP_PAP         0xc023          /* Password Authentication Protocol */
135 #define PPP_CHAP        0xc223          /* Challenge-Handshake Auth Protocol */
136 #define PPP_IPCP        0x8021          /* Internet Protocol Control Protocol */
137 #define PPP_IPV6CP      0x8057          /* IPv6 Control Protocol */
138
139 #define CONF_REQ        1               /* PPP configure request */
140 #define CONF_ACK        2               /* PPP configure acknowledge */
141 #define CONF_NAK        3               /* PPP configure negative ack */
142 #define CONF_REJ        4               /* PPP configure reject */
143 #define TERM_REQ        5               /* PPP terminate request */
144 #define TERM_ACK        6               /* PPP terminate acknowledge */
145 #define CODE_REJ        7               /* PPP code reject */
146 #define PROTO_REJ       8               /* PPP protocol reject */
147 #define ECHO_REQ        9               /* PPP echo request */
148 #define ECHO_REPLY      10              /* PPP echo reply */
149 #define DISC_REQ        11              /* PPP discard request */
150
151 #define LCP_OPT_MRU             1       /* maximum receive unit */
152 #define LCP_OPT_ASYNC_MAP       2       /* async control character map */
153 #define LCP_OPT_AUTH_PROTO      3       /* authentication protocol */
154 #define LCP_OPT_QUAL_PROTO      4       /* quality protocol */
155 #define LCP_OPT_MAGIC           5       /* magic number */
156 #define LCP_OPT_RESERVED        6       /* reserved */
157 #define LCP_OPT_PROTO_COMP      7       /* protocol field compression */
158 #define LCP_OPT_ADDR_COMP       8       /* address/control field compression */
159
160 #define IPCP_OPT_ADDRESSES      1       /* both IP addresses; deprecated */
161 #define IPCP_OPT_COMPRESSION    2       /* IP compression protocol (VJ) */
162 #define IPCP_OPT_ADDRESS        3       /* local IP address */
163
164 #define IPV6CP_OPT_IFID 1       /* interface identifier */
165 #define IPV6CP_OPT_COMPRESSION  2       /* IPv6 compression protocol */
166
167 #define IPCP_COMP_VJ            0x2d    /* Code for VJ compression */
168
169 #define PAP_REQ                 1       /* PAP name/password request */
170 #define PAP_ACK                 2       /* PAP acknowledge */
171 #define PAP_NAK                 3       /* PAP fail */
172
173 #define CHAP_CHALLENGE          1       /* CHAP challenge request */
174 #define CHAP_RESPONSE           2       /* CHAP challenge response */
175 #define CHAP_SUCCESS            3       /* CHAP response ok */
176 #define CHAP_FAILURE            4       /* CHAP response failed */
177
178 #define CHAP_MD5                5       /* hash algorithm - MD5 */
179
180 #define CISCO_MULTICAST         0x8f    /* Cisco multicast address */
181 #define CISCO_UNICAST           0x0f    /* Cisco unicast address */
182 #define CISCO_KEEPALIVE         0x8035  /* Cisco keepalive protocol */
183 #define CISCO_ADDR_REQ          0       /* Cisco address request */
184 #define CISCO_ADDR_REPLY        1       /* Cisco address reply */
185 #define CISCO_KEEPALIVE_REQ     2       /* Cisco keepalive request */
186
187 /* states are named and numbered according to RFC 1661 */
188 #define STATE_INITIAL   0
189 #define STATE_STARTING  1
190 #define STATE_CLOSED    2
191 #define STATE_STOPPED   3
192 #define STATE_CLOSING   4
193 #define STATE_STOPPING  5
194 #define STATE_REQ_SENT  6
195 #define STATE_ACK_RCVD  7
196 #define STATE_ACK_SENT  8
197 #define STATE_OPENED    9
198
199 struct ppp_header {
200         u_char address;
201         u_char control;
202         u_short protocol;
203 } __attribute__((__packed__));
204 #define PPP_HEADER_LEN          sizeof (struct ppp_header)
205
206 struct lcp_header {
207         u_char type;
208         u_char ident;
209         u_short len;
210 } __attribute__((__packed__));
211 #define LCP_HEADER_LEN          sizeof (struct lcp_header)
212
213 struct cisco_packet {
214         u_long type;
215         u_long par1;
216         u_long par2;
217         u_short rel;
218         u_short time0;
219         u_short time1;
220 } __attribute__((__packed__));
221 #define CISCO_PACKET_LEN        sizeof (struct cisco_packet)
222
223 /*
224  * We follow the spelling and capitalization of RFC 1661 here, to make
225  * it easier comparing with the standard.  Please refer to this RFC in
226  * case you can't make sense out of these abbreviation; it will also
227  * explain the semantics related to the various events and actions.
228  */
229 struct cp {
230         u_short proto;          /* PPP control protocol number */
231         u_char protoidx;        /* index into state table in struct sppp */
232         u_char flags;
233 #define CP_LCP          0x01    /* this is the LCP */
234 #define CP_AUTH         0x02    /* this is an authentication protocol */
235 #define CP_NCP          0x04    /* this is a NCP */
236 #define CP_QUAL         0x08    /* this is a quality reporting protocol */
237         const char *name;       /* name of this control protocol */
238         /* event handlers */
239         void    (*Up)(struct sppp *sp);
240         void    (*Down)(struct sppp *sp);
241         void    (*Open)(struct sppp *sp);
242         void    (*Close)(struct sppp *sp);
243         void    (*TO)(void *sp);
244         int     (*RCR)(struct sppp *sp, struct lcp_header *h, int len);
245         void    (*RCN_rej)(struct sppp *sp, struct lcp_header *h, int len);
246         void    (*RCN_nak)(struct sppp *sp, struct lcp_header *h, int len);
247         /* actions */
248         void    (*tlu)(struct sppp *sp);
249         void    (*tld)(struct sppp *sp);
250         void    (*tls)(struct sppp *sp);
251         void    (*tlf)(struct sppp *sp);
252         void    (*scr)(struct sppp *sp);
253 };
254
255 static struct sppp *spppq;
256 #if defined(__DragonFly__)
257 static struct callout keepalive_timeout;
258 #endif
259
260 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 && !defined(__DragonFly__)
261 #define SPP_FMT         "%s%d: "
262 #define SPP_ARGS(ifp)   (ifp)->if_name, (ifp)->if_unit
263 #else
264 #define SPP_FMT         "%s: "
265 #define SPP_ARGS(ifp)   (ifp)->if_xname
266 #endif
267
268 #ifdef INET
269 /*
270  * The following disgusting hack gets around the problem that IP TOS
271  * can't be set yet.  We want to put "interactive" traffic on a high
272  * priority queue.  To decide if traffic is interactive, we check that
273  * a) it is TCP and b) one of its ports is telnet, rlogin or ftp control.
274  *
275  * XXX is this really still necessary?  - joerg -
276  */
277 static u_short interactive_ports[8] = {
278         0,      513,    0,      0,
279         0,      21,     0,      23,
280 };
281 #define INTERACTIVE(p) (interactive_ports[(p) & 7] == (p))
282 #endif
283
284 /* almost every function needs these */
285 #define STDDCL                                                  \
286         struct ifnet *ifp = &sp->pp_if;                         \
287         int debug = ifp->if_flags & IFF_DEBUG
288
289 static int sppp_output(struct ifnet *ifp, struct mbuf *m,
290                        struct sockaddr *dst, struct rtentry *rt);
291
292 static void sppp_cisco_send(struct sppp *sp, int type, long par1, long par2);
293 static void sppp_cisco_input(struct sppp *sp, struct mbuf *m);
294
295 static void sppp_cp_input(const struct cp *cp, struct sppp *sp,
296                           struct mbuf *m);
297 static void sppp_cp_send(struct sppp *sp, u_short proto, u_char type,
298                          u_char ident, u_short len, void *data);
299 /* static void sppp_cp_timeout(void *arg); */
300 static void sppp_cp_change_state(const struct cp *cp, struct sppp *sp,
301                                  int newstate);
302 static void sppp_auth_send(const struct cp *cp,
303                            struct sppp *sp, unsigned int type, unsigned int id,
304                            ...);
305
306 static void sppp_up_event(const struct cp *cp, struct sppp *sp);
307 static void sppp_down_event(const struct cp *cp, struct sppp *sp);
308 static void sppp_open_event(const struct cp *cp, struct sppp *sp);
309 static void sppp_close_event(const struct cp *cp, struct sppp *sp);
310 static void sppp_to_event(const struct cp *cp, struct sppp *sp);
311
312 static void sppp_null(struct sppp *sp);
313
314 static void sppp_lcp_init(struct sppp *sp);
315 static void sppp_lcp_up(struct sppp *sp);
316 static void sppp_lcp_down(struct sppp *sp);
317 static void sppp_lcp_open(struct sppp *sp);
318 static void sppp_lcp_close(struct sppp *sp);
319 static void sppp_lcp_TO(void *sp);
320 static int sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len);
321 static void sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len);
322 static void sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len);
323 static void sppp_lcp_tlu(struct sppp *sp);
324 static void sppp_lcp_tld(struct sppp *sp);
325 static void sppp_lcp_tls(struct sppp *sp);
326 static void sppp_lcp_tlf(struct sppp *sp);
327 static void sppp_lcp_scr(struct sppp *sp);
328 static void sppp_lcp_check_and_close(struct sppp *sp);
329 static int sppp_ncp_check(struct sppp *sp);
330
331 static void sppp_ipcp_init(struct sppp *sp);
332 static void sppp_ipcp_up(struct sppp *sp);
333 static void sppp_ipcp_down(struct sppp *sp);
334 static void sppp_ipcp_open(struct sppp *sp);
335 static void sppp_ipcp_close(struct sppp *sp);
336 static void sppp_ipcp_TO(void *sp);
337 static int sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len);
338 static void sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len);
339 static void sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len);
340 static void sppp_ipcp_tlu(struct sppp *sp);
341 static void sppp_ipcp_tld(struct sppp *sp);
342 static void sppp_ipcp_tls(struct sppp *sp);
343 static void sppp_ipcp_tlf(struct sppp *sp);
344 static void sppp_ipcp_scr(struct sppp *sp);
345
346 static void sppp_ipv6cp_init(struct sppp *sp);
347 static void sppp_ipv6cp_up(struct sppp *sp);
348 static void sppp_ipv6cp_down(struct sppp *sp);
349 static void sppp_ipv6cp_open(struct sppp *sp);
350 static void sppp_ipv6cp_close(struct sppp *sp);
351 static void sppp_ipv6cp_TO(void *sp);
352 static int sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len);
353 static void sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len);
354 static void sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len);
355 static void sppp_ipv6cp_tlu(struct sppp *sp);
356 static void sppp_ipv6cp_tld(struct sppp *sp);
357 static void sppp_ipv6cp_tls(struct sppp *sp);
358 static void sppp_ipv6cp_tlf(struct sppp *sp);
359 static void sppp_ipv6cp_scr(struct sppp *sp);
360
361 static void sppp_pap_input(struct sppp *sp, struct mbuf *m);
362 static void sppp_pap_init(struct sppp *sp);
363 static void sppp_pap_open(struct sppp *sp);
364 static void sppp_pap_close(struct sppp *sp);
365 static void sppp_pap_TO(void *sp);
366 static void sppp_pap_my_TO(void *sp);
367 static void sppp_pap_tlu(struct sppp *sp);
368 static void sppp_pap_tld(struct sppp *sp);
369 static void sppp_pap_scr(struct sppp *sp);
370
371 static void sppp_chap_input(struct sppp *sp, struct mbuf *m);
372 static void sppp_chap_init(struct sppp *sp);
373 static void sppp_chap_open(struct sppp *sp);
374 static void sppp_chap_close(struct sppp *sp);
375 static void sppp_chap_TO(void *sp);
376 static void sppp_chap_tlu(struct sppp *sp);
377 static void sppp_chap_tld(struct sppp *sp);
378 static void sppp_chap_scr(struct sppp *sp);
379
380 static const char *sppp_auth_type_name(u_short proto, u_char type);
381 static const char *sppp_cp_type_name(u_char type);
382 static const char *sppp_dotted_quad(u_long addr);
383 static const char *sppp_ipcp_opt_name(u_char opt);
384 #ifdef INET6
385 static const char *sppp_ipv6cp_opt_name(u_char opt);
386 #endif
387 static const char *sppp_lcp_opt_name(u_char opt);
388 static const char *sppp_phase_name(enum ppp_phase phase);
389 static const char *sppp_proto_name(u_short proto);
390 static const char *sppp_state_name(int state);
391 static int sppp_params(struct sppp *sp, u_long cmd, void *data);
392 static int sppp_strnlen(u_char *p, int max);
393 static void sppp_get_ip_addrs(struct sppp *sp, u_long *src, u_long *dst,
394                               u_long *srcmask);
395 static void sppp_keepalive(void *dummy);
396 static void sppp_phase_network(struct sppp *sp);
397 static void sppp_print_bytes(const u_char *p, u_short len);
398 static void sppp_print_string(const char *p, u_short len);
399 static void sppp_set_ip_addr(struct sppp *sp, u_long src);
400 #ifdef INET6
401 static void sppp_get_ip6_addrs(struct sppp *sp, struct in6_addr *src,
402                                struct in6_addr *dst, struct in6_addr *srcmask);
403 #ifdef IPV6CP_MYIFID_DYN
404 static void sppp_set_ip6_addr(struct sppp *sp, const struct in6_addr *src);
405 static void sppp_gen_ip6_addr(struct sppp *sp, const struct in6_addr *src);
406 #endif
407 static void sppp_suggest_ip6_addr(struct sppp *sp, struct in6_addr *src);
408 #endif
409
410 /* our control protocol descriptors */
411 static const struct cp lcp = {
412         PPP_LCP, IDX_LCP, CP_LCP, "lcp",
413         sppp_lcp_up, sppp_lcp_down, sppp_lcp_open, sppp_lcp_close,
414         sppp_lcp_TO, sppp_lcp_RCR, sppp_lcp_RCN_rej, sppp_lcp_RCN_nak,
415         sppp_lcp_tlu, sppp_lcp_tld, sppp_lcp_tls, sppp_lcp_tlf,
416         sppp_lcp_scr
417 };
418
419 static const struct cp ipcp = {
420         PPP_IPCP, IDX_IPCP, CP_NCP, "ipcp",
421         sppp_ipcp_up, sppp_ipcp_down, sppp_ipcp_open, sppp_ipcp_close,
422         sppp_ipcp_TO, sppp_ipcp_RCR, sppp_ipcp_RCN_rej, sppp_ipcp_RCN_nak,
423         sppp_ipcp_tlu, sppp_ipcp_tld, sppp_ipcp_tls, sppp_ipcp_tlf,
424         sppp_ipcp_scr
425 };
426
427 static const struct cp ipv6cp = {
428         PPP_IPV6CP, IDX_IPV6CP,
429 #ifdef INET6    /*don't run IPv6CP if there's no IPv6 support*/
430         CP_NCP,
431 #else
432         0,
433 #endif
434         "ipv6cp",
435         sppp_ipv6cp_up, sppp_ipv6cp_down, sppp_ipv6cp_open, sppp_ipv6cp_close,
436         sppp_ipv6cp_TO, sppp_ipv6cp_RCR, sppp_ipv6cp_RCN_rej, sppp_ipv6cp_RCN_nak,
437         sppp_ipv6cp_tlu, sppp_ipv6cp_tld, sppp_ipv6cp_tls, sppp_ipv6cp_tlf,
438         sppp_ipv6cp_scr
439 };
440
441 static const struct cp pap = {
442         PPP_PAP, IDX_PAP, CP_AUTH, "pap",
443         sppp_null, sppp_null, sppp_pap_open, sppp_pap_close,
444         sppp_pap_TO, 0, 0, 0,
445         sppp_pap_tlu, sppp_pap_tld, sppp_null, sppp_null,
446         sppp_pap_scr
447 };
448
449 static const struct cp chap = {
450         PPP_CHAP, IDX_CHAP, CP_AUTH, "chap",
451         sppp_null, sppp_null, sppp_chap_open, sppp_chap_close,
452         sppp_chap_TO, 0, 0, 0,
453         sppp_chap_tlu, sppp_chap_tld, sppp_null, sppp_null,
454         sppp_chap_scr
455 };
456
457 static const struct cp *cps[IDX_COUNT] = {
458         &lcp,                   /* IDX_LCP */
459         &ipcp,                  /* IDX_IPCP */
460         &ipv6cp,                /* IDX_IPV6CP */
461         &pap,                   /* IDX_PAP */
462         &chap,                  /* IDX_CHAP */
463 };
464
465 static int
466 sppp_modevent(module_t mod, int type, void *unused)
467 {
468         switch (type) {
469         case MOD_LOAD:
470                 callout_init(&keepalive_timeout);
471                 break;
472         case MOD_UNLOAD:
473                 return EACCES;
474                 break;
475         default:
476                 break;
477         }
478         return 0;
479 }
480 static moduledata_t spppmod = {
481         "sppp",
482         sppp_modevent,
483         0
484 };
485 MODULE_VERSION(sppp, 1);
486 DECLARE_MODULE(sppp, spppmod, SI_SUB_DRIVERS, SI_ORDER_ANY);
487
488 /*
489  * Exported functions, comprising our interface to the lower layer.
490  */
491
492 /*
493  * Process the received packet.
494  */
495 void
496 sppp_input(struct ifnet *ifp, struct mbuf *m)
497 {
498         struct ppp_header *h;
499         int isr = -1;
500         struct sppp *sp = (struct sppp *)ifp;
501         u_char *iphdr;
502         int hlen, vjlen, do_account = 0;
503         int debug = ifp->if_flags & IFF_DEBUG;
504
505         if (ifp->if_flags & IFF_UP)
506                 /* Count received bytes, add FCS and one flag */
507                 ifp->if_ibytes += m->m_pkthdr.len + 3;
508
509         if (m->m_pkthdr.len <= PPP_HEADER_LEN) {
510                 /* Too small packet, drop it. */
511                 if (debug)
512                         log(LOG_DEBUG,
513                             SPP_FMT "input packet is too small, %d bytes\n",
514                             SPP_ARGS(ifp), m->m_pkthdr.len);
515 drop:
516                 m_freem (m);
517 drop2:
518                 ++ifp->if_ierrors;
519                 ++ifp->if_iqdrops;
520                 return;
521         }
522
523         /* Get PPP header. */
524         h = mtod (m, struct ppp_header*);
525         m_adj (m, PPP_HEADER_LEN);
526
527         switch (h->address) {
528         case PPP_ALLSTATIONS:
529                 if (h->control != PPP_UI)
530                         goto invalid;
531                 if (sp->pp_mode == IFF_CISCO) {
532                         if (debug)
533                                 log(LOG_DEBUG,
534                                     SPP_FMT "PPP packet in Cisco mode "
535                                     "<addr=0x%x ctrl=0x%x proto=0x%x>\n",
536                                     SPP_ARGS(ifp),
537                                     h->address, h->control, ntohs(h->protocol));
538                         goto drop;
539                 }
540                 switch (ntohs (h->protocol)) {
541                 default:
542                         if (debug)
543                                 log(LOG_DEBUG,
544                                     SPP_FMT "rejecting protocol "
545                                     "<addr=0x%x ctrl=0x%x proto=0x%x>\n",
546                                     SPP_ARGS(ifp),
547                                     h->address, h->control, ntohs(h->protocol));
548                         if (sp->state[IDX_LCP] == STATE_OPENED)
549                                 sppp_cp_send (sp, PPP_LCP, PROTO_REJ,
550                                         ++sp->pp_seq[IDX_LCP], m->m_pkthdr.len + 2,
551                                         &h->protocol);
552                         ++ifp->if_noproto;
553                         goto drop;
554                 case PPP_LCP:
555                         sppp_cp_input(&lcp, sp, m);
556                         m_freem (m);
557                         return;
558                 case PPP_PAP:
559                         if (sp->pp_phase >= PHASE_AUTHENTICATE)
560                                 sppp_pap_input(sp, m);
561                         m_freem (m);
562                         return;
563                 case PPP_CHAP:
564                         if (sp->pp_phase >= PHASE_AUTHENTICATE)
565                                 sppp_chap_input(sp, m);
566                         m_freem (m);
567                         return;
568 #ifdef INET
569                 case PPP_IPCP:
570                         if (sp->pp_phase == PHASE_NETWORK)
571                                 sppp_cp_input(&ipcp, sp, m);
572                         m_freem (m);
573                         return;
574                 case PPP_IP:
575                         if (sp->state[IDX_IPCP] == STATE_OPENED) {
576                                 isr = NETISR_IP;
577                         }
578                         do_account++;
579                         break;
580                 case PPP_VJ_COMP:
581                         if (sp->state[IDX_IPCP] == STATE_OPENED) {
582                                 if ((vjlen =
583                                      sl_uncompress_tcp_core(mtod(m, u_char *),
584                                                             m->m_len, m->m_len,
585                                                             TYPE_COMPRESSED_TCP,
586                                                             sp->pp_comp,
587                                                             &iphdr, &hlen)) <= 0) {
588                                         if (debug)
589                                                 log(LOG_INFO,
590                             SPP_FMT "VJ uncompress failed on compressed packet\n",
591                                                     SPP_ARGS(ifp));
592                                         goto drop;
593                                 }
594
595                                 /*
596                                  * Trim the VJ header off the packet, and prepend
597                                  * the uncompressed IP header (which will usually
598                                  * end up in two chained mbufs since there's not
599                                  * enough leading space in the existing mbuf).
600                                  */
601                                 m_adj(m, vjlen);
602                                 M_PREPEND(m, hlen, MB_DONTWAIT);
603                                 if (m == NULL)
604                                         goto drop2;
605                                 bcopy(iphdr, mtod(m, u_char *), hlen);
606
607                                 isr = NETISR_IP;
608                         }
609                         do_account++;
610                         break;
611                 case PPP_VJ_UCOMP:
612                         if (sp->state[IDX_IPCP] == STATE_OPENED) {
613                                 if (sl_uncompress_tcp_core(mtod(m, u_char *),
614                                                            m->m_len, m->m_len,
615                                                            TYPE_UNCOMPRESSED_TCP,
616                                                            sp->pp_comp,
617                                                            &iphdr, &hlen) != 0) {
618                                         if (debug)
619                                                 log(LOG_INFO,
620                             SPP_FMT "VJ uncompress failed on uncompressed packet\n",
621                                                     SPP_ARGS(ifp));
622                                         goto drop;
623                                 }
624                                 isr = NETISR_IP;
625                         }
626                         do_account++;
627                         break;
628 #endif
629 #ifdef INET6
630                 case PPP_IPV6CP:
631                         if (sp->pp_phase == PHASE_NETWORK)
632                             sppp_cp_input(&ipv6cp, sp, m);
633                         m_freem (m);
634                         return;
635
636                 case PPP_IPV6:
637                         if (sp->state[IDX_IPV6CP] == STATE_OPENED) {
638                                 isr = NETISR_IPV6;
639                         }
640                         do_account++;
641                         break;
642 #endif
643 #ifdef IPX
644                 case PPP_IPX:
645                         /* IPX IPXCP not implemented yet */
646                         if (sp->pp_phase == PHASE_NETWORK) {
647                                 isr = NETISR_IPX;
648                         }
649                         do_account++;
650                         break;
651 #endif
652                 }
653                 break;
654         case CISCO_MULTICAST:
655         case CISCO_UNICAST:
656                 /* Don't check the control field here (RFC 1547). */
657                 if (sp->pp_mode != IFF_CISCO) {
658                         if (debug)
659                                 log(LOG_DEBUG,
660                                     SPP_FMT "Cisco packet in PPP mode "
661                                     "<addr=0x%x ctrl=0x%x proto=0x%x>\n",
662                                     SPP_ARGS(ifp),
663                                     h->address, h->control, ntohs(h->protocol));
664                         goto drop;
665                 }
666                 switch (ntohs (h->protocol)) {
667                 default:
668                         ++ifp->if_noproto;
669                         goto invalid;
670                 case CISCO_KEEPALIVE:
671                         sppp_cisco_input ((struct sppp*) ifp, m);
672                         m_freem (m);
673                         return;
674 #ifdef INET
675                 case ETHERTYPE_IP:
676                         isr = NETISR_IP;
677                         do_account++;
678                         break;
679 #endif
680 #ifdef INET6
681                 case ETHERTYPE_IPV6:
682                         isr = NETISR_IPV6;
683                         do_account++;
684                         break;
685 #endif
686 #ifdef IPX
687                 case ETHERTYPE_IPX:
688                         isr = NETISR_IPX;
689                         do_account++;
690                         break;
691 #endif
692                 }
693                 break;
694         default:        /* Invalid PPP packet. */
695           invalid:
696                 if (debug)
697                         log(LOG_DEBUG,
698                             SPP_FMT "invalid input packet "
699                             "<addr=0x%x ctrl=0x%x proto=0x%x>\n",
700                             SPP_ARGS(ifp),
701                             h->address, h->control, ntohs(h->protocol));
702                 goto drop;
703         }
704
705         if (! (ifp->if_flags & IFF_UP) || isr < 0)
706                 goto drop;
707
708         /* Check queue. */
709
710         netisr_queue(isr, m);
711
712         /*
713          * Do only account for network packets, not for control
714          * packets.  This is used by some subsystems to detect
715          * idle lines.
716          */
717         if (do_account)
718                 sp->pp_last_recv = time_second;
719 }
720
721 /*
722  * Enqueue transmit packet.
723  */
724 static int
725 sppp_output_serialized(struct ifnet *ifp, struct mbuf *m,
726                        struct sockaddr *dst, struct rtentry *rt)
727 {
728         struct sppp *sp = (struct sppp*) ifp;
729         struct ppp_header *h;
730         struct ifqueue *ifq = NULL;
731         int rv = 0;
732         int ipproto = PPP_IP;
733         int debug = ifp->if_flags & IFF_DEBUG;
734         struct altq_pktattr pktattr;
735
736         crit_enter();
737
738         if ((ifp->if_flags & IFF_UP) == 0 ||
739             (ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == 0) {
740 #ifdef INET6
741           drop:
742 #endif
743                 m_freem (m);
744                 crit_exit();
745                 return (ENETDOWN);
746         }
747
748         if ((ifp->if_flags & (IFF_RUNNING | IFF_AUTO)) == IFF_AUTO) {
749 #ifdef INET6
750                 /*
751                  * XXX
752                  *
753                  * Hack to prevent the initialization-time generated
754                  * IPv6 multicast packet to erroneously cause a
755                  * dialout event in case IPv6 has been
756                  * administratively disabled on that interface.
757                  */
758                 if (dst->sa_family == AF_INET6 &&
759                     !(sp->confflags & CONF_ENABLE_IPV6))
760                         goto drop;
761 #endif
762                 /*
763                  * Interface is not yet running, but auto-dial.  Need
764                  * to start LCP for it.
765                  */
766                 ifp->if_flags |= IFF_RUNNING;
767                 crit_exit();
768                 lcp.Open(sp);
769                 crit_enter();
770         }
771
772         /*
773          * if the queueing discipline needs packet classification,
774          * do it before prepending link headers.
775          */
776         ifq_classify(&ifp->if_snd, m, dst->sa_family, &pktattr);
777
778 #ifdef INET
779         if (dst->sa_family == AF_INET) {
780                 /* XXX Check mbuf length here? */
781                 struct ip *ip = mtod (m, struct ip*);
782                 struct tcphdr *tcp = (struct tcphdr*) ((long*)ip + ip->ip_hl);
783
784                 /*
785                  * When using dynamic local IP address assignment by using
786                  * 0.0.0.0 as a local address, the first TCP session will
787                  * not connect because the local TCP checksum is computed
788                  * using 0.0.0.0 which will later become our real IP address
789                  * so the TCP checksum computed at the remote end will
790                  * become invalid. So we
791                  * - don't let packets with src ip addr 0 thru
792                  * - we flag TCP packets with src ip 0 as an error
793                  */
794
795                 if(ip->ip_src.s_addr == INADDR_ANY)     /* -hm */
796                 {
797                         m_freem(m);
798                         crit_exit();
799                         if(ip->ip_p == IPPROTO_TCP)
800                                 return(EADDRNOTAVAIL);
801                         else
802                                 return(0);
803                 }
804
805                 /*
806                  * Put low delay, telnet, rlogin and ftp control packets
807                  * in front of the queue.
808                  */
809                 if (IF_QFULL (&sp->pp_fastq))
810                         ;
811                 else if (ip->ip_tos & IPTOS_LOWDELAY)
812                         ifq = &sp->pp_fastq;
813                 else if (m->m_len < sizeof *ip + sizeof *tcp)
814                         ;
815                 else if (ip->ip_p != IPPROTO_TCP)
816                         ;
817                 else if (INTERACTIVE (ntohs (tcp->th_sport)))
818                         ifq = &sp->pp_fastq;
819                 else if (INTERACTIVE (ntohs (tcp->th_dport)))
820                         ifq = &sp->pp_fastq;
821
822                 /*
823                  * Do IP Header compression
824                  */
825                 if (sp->pp_mode != IFF_CISCO && (sp->ipcp.flags & IPCP_VJ) &&
826                     ip->ip_p == IPPROTO_TCP)
827                         switch (sl_compress_tcp(m, ip, sp->pp_comp,
828                                                 sp->ipcp.compress_cid)) {
829                         case TYPE_COMPRESSED_TCP:
830                                 ipproto = PPP_VJ_COMP;
831                                 break;
832                         case TYPE_UNCOMPRESSED_TCP:
833                                 ipproto = PPP_VJ_UCOMP;
834                                 break;
835                         case TYPE_IP:
836                                 ipproto = PPP_IP;
837                                 break;
838                         default:
839                                 m_freem(m);
840                                 crit_exit();
841                                 return (EINVAL);
842                         }
843         }
844 #endif
845
846 #ifdef INET6
847         if (dst->sa_family == AF_INET6) {
848                 /* XXX do something tricky here? */
849         }
850 #endif
851
852         /*
853          * Prepend general data packet PPP header. For now, IP only.
854          */
855         M_PREPEND (m, PPP_HEADER_LEN, MB_DONTWAIT);
856         if (! m) {
857                 if (debug)
858                         log(LOG_DEBUG, SPP_FMT "no memory for transmit header\n",
859                                 SPP_ARGS(ifp));
860                 ++ifp->if_oerrors;
861                 crit_exit();
862                 return (ENOBUFS);
863         }
864         /*
865          * May want to check size of packet
866          * (albeit due to the implementation it's always enough)
867          */
868         h = mtod (m, struct ppp_header*);
869         if (sp->pp_mode == IFF_CISCO) {
870                 h->address = CISCO_UNICAST;        /* unicast address */
871                 h->control = 0;
872         } else {
873                 h->address = PPP_ALLSTATIONS;        /* broadcast address */
874                 h->control = PPP_UI;                 /* Unnumbered Info */
875         }
876
877         switch (dst->sa_family) {
878 #ifdef INET
879         case AF_INET:   /* Internet Protocol */
880                 if (sp->pp_mode == IFF_CISCO)
881                         h->protocol = htons (ETHERTYPE_IP);
882                 else {
883                         /*
884                          * Don't choke with an ENETDOWN early.  It's
885                          * possible that we just started dialing out,
886                          * so don't drop the packet immediately.  If
887                          * we notice that we run out of buffer space
888                          * below, we will however remember that we are
889                          * not ready to carry IP packets, and return
890                          * ENETDOWN, as opposed to ENOBUFS.
891                          */
892                         h->protocol = htons(ipproto);
893                         if (sp->state[IDX_IPCP] != STATE_OPENED)
894                                 rv = ENETDOWN;
895                 }
896                 break;
897 #endif
898 #ifdef INET6
899         case AF_INET6:   /* Internet Protocol */
900                 if (sp->pp_mode == IFF_CISCO)
901                         h->protocol = htons (ETHERTYPE_IPV6);
902                 else {
903                         /*
904                          * Don't choke with an ENETDOWN early.  It's
905                          * possible that we just started dialing out,
906                          * so don't drop the packet immediately.  If
907                          * we notice that we run out of buffer space
908                          * below, we will however remember that we are
909                          * not ready to carry IP packets, and return
910                          * ENETDOWN, as opposed to ENOBUFS.
911                          */
912                         h->protocol = htons(PPP_IPV6);
913                         if (sp->state[IDX_IPV6CP] != STATE_OPENED)
914                                 rv = ENETDOWN;
915                 }
916                 break;
917 #endif
918 #ifdef IPX
919         case AF_IPX:     /* Novell IPX Protocol */
920                 h->protocol = htons (sp->pp_mode == IFF_CISCO ?
921                         ETHERTYPE_IPX : PPP_IPX);
922                 break;
923 #endif
924         default:
925                 m_freem (m);
926                 ++ifp->if_oerrors;
927                 crit_exit();
928                 return (EAFNOSUPPORT);
929         }
930
931         /*
932          * Queue message on interface, and start output if interface
933          * not yet active.
934          */
935         if (ifq != NULL) {
936                 if (IF_QFULL(ifq)) {
937                         IF_DROP(ifq);
938                         m_freem(m);
939                         rv = ENOBUFS;
940                         ifq->ifq_drops++;
941                 } else {
942                         IF_ENQUEUE(ifq, m);
943                         rv = 0;
944                 }
945         } else {
946                 rv = ifq_enqueue(&ifp->if_snd, m, &pktattr);
947         }
948         if (rv) {
949                 ++ifp->if_oerrors;
950                 crit_exit();
951                 return(rv);
952         }
953         if (! (ifp->if_flags & IFF_OACTIVE))
954                 (*ifp->if_start) (ifp);
955
956         /*
957          * Count output packets and bytes.
958          * The packet length includes header, FCS and 1 flag,
959          * according to RFC 1333.
960          */
961         ifp->if_obytes += m->m_pkthdr.len + 3;
962
963         /*
964          * Unlike in sppp_input(), we can always bump the timestamp
965          * here since sppp_output() is only called on behalf of
966          * network-layer traffic; control-layer traffic is handled
967          * by sppp_cp_send().
968          */
969         sp->pp_last_sent = time_second;
970
971         crit_exit();
972         return (0);
973 }
974
975 static int
976 sppp_output(struct ifnet *ifp, struct mbuf *m,
977             struct sockaddr *dst, struct rtentry *rt)
978 {
979         int error;
980
981         ifnet_serialize_tx(ifp);
982         error = sppp_output_serialized(ifp, m, dst, rt);
983         ifnet_deserialize_tx(ifp);
984
985         return error;
986 }
987
988 void
989 sppp_attach(struct ifnet *ifp)
990 {
991         struct sppp *sp = (struct sppp*) ifp;
992
993         /* Initialize keepalive handler. */
994         if (!spppq) {
995                 callout_reset(&keepalive_timeout, hz * 10,
996                                 sppp_keepalive, NULL);
997         }
998         /* Insert new entry into the keepalive list. */
999         sp->pp_next = spppq;
1000         spppq = sp;
1001
1002         sp->pp_if.if_mtu = PP_MTU;
1003         sp->pp_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST;
1004         sp->pp_if.if_type = IFT_PPP;
1005         sp->pp_if.if_output = sppp_output;
1006 #if 0
1007         sp->pp_flags = PP_KEEPALIVE;
1008 #endif
1009         sp->pp_if.if_snd.ifq_maxlen = 32;
1010         sp->pp_fastq.ifq_maxlen = 32;
1011         sp->pp_cpq.ifq_maxlen = 20;
1012         sp->pp_loopcnt = 0;
1013         sp->pp_alivecnt = 0;
1014         bzero(&sp->pp_seq[0], sizeof(sp->pp_seq));
1015         bzero(&sp->pp_rseq[0], sizeof(sp->pp_rseq));
1016         sp->pp_phase = PHASE_DEAD;
1017         sp->pp_up = lcp.Up;
1018         sp->pp_down = lcp.Down;
1019         sp->pp_last_recv = sp->pp_last_sent = time_second;
1020         sp->confflags = 0;
1021 #ifdef INET
1022         sp->confflags |= CONF_ENABLE_VJ;
1023 #endif
1024 #ifdef INET6
1025         sp->confflags |= CONF_ENABLE_IPV6;
1026 #endif
1027         sp->pp_comp = kmalloc(sizeof(struct slcompress), M_TEMP, M_WAITOK);
1028         sl_compress_init(sp->pp_comp, -1);
1029         sppp_lcp_init(sp);
1030         sppp_ipcp_init(sp);
1031         sppp_ipv6cp_init(sp);
1032         sppp_pap_init(sp);
1033         sppp_chap_init(sp);
1034 }
1035
1036 void
1037 sppp_detach(struct ifnet *ifp)
1038 {
1039         struct sppp **q, *p, *sp = (struct sppp*) ifp;
1040         int i;
1041
1042         /* Remove the entry from the keepalive list. */
1043         for (q = &spppq; (p = *q); q = &p->pp_next)
1044                 if (p == sp) {
1045                         *q = p->pp_next;
1046                         break;
1047                 }
1048
1049         /* Stop keepalive handler. */
1050         if (!spppq)
1051                 callout_stop(&keepalive_timeout);
1052
1053         for (i = 0; i < IDX_COUNT; i++)
1054                 callout_stop(&sp->timeout[i]);
1055         callout_stop(&sp->pap_my_to);
1056 }
1057
1058 /*
1059  * Flush the interface output queue.
1060  */
1061 void
1062 sppp_flush(struct ifnet *ifp)
1063 {
1064         struct sppp *sp = (struct sppp*) ifp;
1065
1066         ifq_purge(&sp->pp_if.if_snd);
1067         IF_DRAIN(&sp->pp_fastq);
1068         IF_DRAIN(&sp->pp_cpq);
1069 }
1070
1071 /*
1072  * Check if the output queue is empty.
1073  */
1074 int
1075 sppp_isempty(struct ifnet *ifp)
1076 {
1077         struct sppp *sp = (struct sppp*) ifp;
1078         int empty;
1079
1080         crit_enter();
1081         empty = IF_QEMPTY(&sp->pp_fastq) && IF_QEMPTY(&sp->pp_cpq) &&
1082                 ifq_is_empty(&sp->pp_if.if_snd);
1083         crit_exit();
1084         return (empty);
1085 }
1086
1087 /*
1088  * Get next packet to send.
1089  */
1090 struct mbuf *
1091 sppp_dequeue(struct ifnet *ifp)
1092 {
1093         struct sppp *sp = (struct sppp*) ifp;
1094         struct mbuf *m;
1095
1096         crit_enter();
1097
1098         /*
1099          * Process only the control protocol queue until we have at
1100          * least one NCP open.
1101          *
1102          * Do always serve all three queues in Cisco mode.
1103          */
1104         IF_DEQUEUE(&sp->pp_cpq, m);
1105         if (m == NULL &&
1106             (sppp_ncp_check(sp) || sp->pp_mode == IFF_CISCO)) {
1107                 IF_DEQUEUE(&sp->pp_fastq, m);
1108                 if (m == NULL)
1109                         m = ifq_dequeue(&sp->pp_if.if_snd, NULL);
1110         }
1111
1112         crit_exit();
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
1125         crit_enter();
1126
1127         m = sp->pp_cpq.ifq_head;
1128         if (m == NULL &&
1129             (sp->pp_phase == PHASE_NETWORK || sp->pp_mode == IFF_CISCO)) {
1130                 if ((m = sp->pp_fastq.ifq_head) == NULL)
1131                         m = ifq_poll(&sp->pp_if.if_snd);
1132         }
1133
1134         crit_exit();
1135         return (m);
1136 }
1137
1138 /*
1139  * Process an ioctl request.  Called on low priority level.
1140  */
1141 int
1142 sppp_ioctl(struct ifnet *ifp, IOCTL_CMD_T cmd, void *data)
1143 {
1144         struct ifreq *ifr = (struct ifreq*) data;
1145         struct sppp *sp = (struct sppp*) ifp;
1146         int rv, going_up, going_down, newmode;
1147
1148         crit_enter();
1149
1150         rv = 0;
1151         switch (cmd) {
1152         case SIOCAIFADDR:
1153         case SIOCSIFDSTADDR:
1154                 break;
1155
1156         case SIOCSIFADDR:
1157                 /* set the interface "up" when assigning an IP address */
1158                 ifp->if_flags |= IFF_UP;
1159                 /* fall through... */
1160
1161         case SIOCSIFFLAGS:
1162                 going_up = ifp->if_flags & IFF_UP &&
1163                         (ifp->if_flags & IFF_RUNNING) == 0;
1164                 going_down = (ifp->if_flags & IFF_UP) == 0 &&
1165                         ifp->if_flags & IFF_RUNNING;
1166
1167                 newmode = ifp->if_flags & IFF_PASSIVE;
1168                 if (!newmode)
1169                         newmode = ifp->if_flags & IFF_AUTO;
1170                 if (!newmode)
1171                         newmode = ifp->if_flags & IFF_CISCO;
1172                 ifp->if_flags &= ~(IFF_PASSIVE | IFF_AUTO | IFF_CISCO);
1173                 ifp->if_flags |= newmode;
1174
1175                 if (newmode != sp->pp_mode) {
1176                         going_down = 1;
1177                         if (!going_up)
1178                                 going_up = ifp->if_flags & IFF_RUNNING;
1179                 }
1180
1181                 if (going_down) {
1182                         if (sp->pp_mode != IFF_CISCO)
1183                                 lcp.Close(sp);
1184                         else if (sp->pp_tlf)
1185                                 (sp->pp_tlf)(sp);
1186                         sppp_flush(ifp);
1187                         ifp->if_flags &= ~IFF_RUNNING;
1188                         sp->pp_mode = newmode;
1189                 }
1190
1191                 if (going_up) {
1192                         if (sp->pp_mode != IFF_CISCO)
1193                                 lcp.Close(sp);
1194                         sp->pp_mode = newmode;
1195                         if (sp->pp_mode == 0) {
1196                                 ifp->if_flags |= IFF_RUNNING;
1197                                 lcp.Open(sp);
1198                         }
1199                         if (sp->pp_mode == IFF_CISCO) {
1200                                 if (sp->pp_tls)
1201                                         (sp->pp_tls)(sp);
1202                                 ifp->if_flags |= IFF_RUNNING;
1203                         }
1204                 }
1205
1206                 break;
1207
1208 #ifdef SIOCSIFMTU
1209 #ifndef ifr_mtu
1210 #define ifr_mtu ifr_metric
1211 #endif
1212         case SIOCSIFMTU:
1213                 if (ifr->ifr_mtu < 128 || ifr->ifr_mtu > sp->lcp.their_mru)
1214                         return (EINVAL);
1215                 ifp->if_mtu = ifr->ifr_mtu;
1216                 break;
1217 #endif
1218 #ifdef SLIOCSETMTU
1219         case SLIOCSETMTU:
1220                 if (*(short*)data < 128 || *(short*)data > sp->lcp.their_mru)
1221                         return (EINVAL);
1222                 ifp->if_mtu = *(short*)data;
1223                 break;
1224 #endif
1225 #ifdef SIOCGIFMTU
1226         case SIOCGIFMTU:
1227                 ifr->ifr_mtu = ifp->if_mtu;
1228                 break;
1229 #endif
1230 #ifdef SLIOCGETMTU
1231         case SLIOCGETMTU:
1232                 *(short*)data = ifp->if_mtu;
1233                 break;
1234 #endif
1235         case SIOCADDMULTI:
1236         case SIOCDELMULTI:
1237                 break;
1238
1239         case SIOCGIFGENERIC:
1240         case SIOCSIFGENERIC:
1241                 rv = sppp_params(sp, cmd, data);
1242                 break;
1243
1244         default:
1245                 rv = ENOTTY;
1246         }
1247
1248         crit_exit();
1249         return rv;
1250 }
1251
1252 /*
1253  * Cisco framing implementation.
1254  */
1255
1256 /*
1257  * Handle incoming Cisco keepalive protocol packets.
1258  */
1259 static void
1260 sppp_cisco_input(struct sppp *sp, struct mbuf *m)
1261 {
1262         STDDCL;
1263         struct cisco_packet *h;
1264         u_long me, mymask;
1265
1266         if (m->m_pkthdr.len < CISCO_PACKET_LEN) {
1267                 if (debug)
1268                         log(LOG_DEBUG,
1269                             SPP_FMT "cisco invalid packet length: %d bytes\n",
1270                             SPP_ARGS(ifp), m->m_pkthdr.len);
1271                 return;
1272         }
1273         h = mtod (m, struct cisco_packet*);
1274         if (debug)
1275                 log(LOG_DEBUG,
1276                     SPP_FMT "cisco input: %d bytes "
1277                     "<0x%lx 0x%lx 0x%lx 0x%x 0x%x-0x%x>\n",
1278                     SPP_ARGS(ifp), m->m_pkthdr.len,
1279                     (u_long)ntohl (h->type), h->par1, h->par2, (u_int)h->rel,
1280                     (u_int)h->time0, (u_int)h->time1);
1281         switch (ntohl (h->type)) {
1282         default:
1283                 if (debug)
1284                         log(-1, SPP_FMT "cisco unknown packet type: 0x%lx\n",
1285                                SPP_ARGS(ifp), (u_long)ntohl (h->type));
1286                 break;
1287         case CISCO_ADDR_REPLY:
1288                 /* Reply on address request, ignore */
1289                 break;
1290         case CISCO_KEEPALIVE_REQ:
1291                 sp->pp_alivecnt = 0;
1292                 sp->pp_rseq[IDX_LCP] = ntohl (h->par1);
1293                 if (sp->pp_seq[IDX_LCP] == sp->pp_rseq[IDX_LCP]) {
1294                         /* Local and remote sequence numbers are equal.
1295                          * Probably, the line is in loopback mode. */
1296                         if (sp->pp_loopcnt >= MAXALIVECNT) {
1297                                 kprintf (SPP_FMT "loopback\n",
1298                                         SPP_ARGS(ifp));
1299                                 sp->pp_loopcnt = 0;
1300                                 if (ifp->if_flags & IFF_UP) {
1301                                         if_down (ifp);
1302                                         IF_DRAIN(&sp->pp_cpq);
1303                                 }
1304                         }
1305                         ++sp->pp_loopcnt;
1306
1307                         /* Generate new local sequence number */
1308 #if defined(__DragonFly__)
1309                         sp->pp_seq[IDX_LCP] = krandom();
1310 #else
1311                         sp->pp_seq[IDX_LCP] ^= time.tv_sec ^ time.tv_usec;
1312 #endif
1313                         break;
1314                 }
1315                 sp->pp_loopcnt = 0;
1316                 if (! (ifp->if_flags & IFF_UP) &&
1317                     (ifp->if_flags & IFF_RUNNING)) {
1318                         if_up(ifp);
1319                         kprintf (SPP_FMT "up\n", SPP_ARGS(ifp));
1320                 }
1321                 break;
1322         case CISCO_ADDR_REQ:
1323                 sppp_get_ip_addrs(sp, &me, 0, &mymask);
1324                 if (me != 0L)
1325                         sppp_cisco_send(sp, CISCO_ADDR_REPLY, me, mymask);
1326                 break;
1327         }
1328 }
1329
1330 /*
1331  * Send Cisco keepalive packet.
1332  */
1333 static void
1334 sppp_cisco_send(struct sppp *sp, int type, long par1, long par2)
1335 {
1336         STDDCL;
1337         struct ppp_header *h;
1338         struct cisco_packet *ch;
1339         struct mbuf *m;
1340 #if defined(__DragonFly__)
1341         struct timeval tv;
1342 #else
1343         u_long t = (time.tv_sec - boottime.tv_sec) * 1000;
1344 #endif
1345
1346 #if defined(__DragonFly__)
1347         getmicrouptime(&tv);
1348 #endif
1349
1350         MGETHDR (m, MB_DONTWAIT, MT_DATA);
1351         if (! m)
1352                 return;
1353         m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + CISCO_PACKET_LEN;
1354         m->m_pkthdr.rcvif = 0;
1355
1356         h = mtod (m, struct ppp_header*);
1357         h->address = CISCO_MULTICAST;
1358         h->control = 0;
1359         h->protocol = htons (CISCO_KEEPALIVE);
1360
1361         ch = (struct cisco_packet*) (h + 1);
1362         ch->type = htonl (type);
1363         ch->par1 = htonl (par1);
1364         ch->par2 = htonl (par2);
1365         ch->rel = -1;
1366
1367 #if defined(__DragonFly__)
1368         ch->time0 = htons ((u_short) (tv.tv_sec >> 16));
1369         ch->time1 = htons ((u_short) tv.tv_sec);
1370 #else
1371         ch->time0 = htons ((u_short) (t >> 16));
1372         ch->time1 = htons ((u_short) t);
1373 #endif
1374
1375         if (debug)
1376                 log(LOG_DEBUG,
1377                     SPP_FMT "cisco output: <0x%lx 0x%lx 0x%lx 0x%x 0x%x-0x%x>\n",
1378                         SPP_ARGS(ifp), (u_long)ntohl (ch->type), ch->par1,
1379                         ch->par2, (u_int)ch->rel, (u_int)ch->time0, (u_int)ch->time1);
1380
1381         if (IF_QFULL (&sp->pp_cpq)) {
1382                 IF_DROP (&sp->pp_fastq);
1383                 IF_DROP (&ifp->if_snd);
1384                 m_freem (m);
1385         } else
1386                 IF_ENQUEUE (&sp->pp_cpq, m);
1387         if (! (ifp->if_flags & IFF_OACTIVE))
1388                 (*ifp->if_start) (ifp);
1389         ifp->if_obytes += m->m_pkthdr.len + 3;
1390 }
1391
1392 /*
1393  * PPP protocol implementation.
1394  */
1395
1396 /*
1397  * Send PPP control protocol packet.
1398  */
1399 static void
1400 sppp_cp_send(struct sppp *sp, u_short proto, u_char type,
1401              u_char ident, u_short len, void *data)
1402 {
1403         STDDCL;
1404         struct ppp_header *h;
1405         struct lcp_header *lh;
1406         struct mbuf *m;
1407
1408         if (len > MHLEN - PPP_HEADER_LEN - LCP_HEADER_LEN)
1409                 len = MHLEN - PPP_HEADER_LEN - LCP_HEADER_LEN;
1410         MGETHDR (m, MB_DONTWAIT, MT_DATA);
1411         if (! m)
1412                 return;
1413         m->m_pkthdr.len = m->m_len = PPP_HEADER_LEN + LCP_HEADER_LEN + len;
1414         m->m_pkthdr.rcvif = 0;
1415
1416         h = mtod (m, struct ppp_header*);
1417         h->address = PPP_ALLSTATIONS;        /* broadcast address */
1418         h->control = PPP_UI;                 /* Unnumbered Info */
1419         h->protocol = htons (proto);         /* Link Control Protocol */
1420
1421         lh = (struct lcp_header*) (h + 1);
1422         lh->type = type;
1423         lh->ident = ident;
1424         lh->len = htons (LCP_HEADER_LEN + len);
1425         if (len)
1426                 bcopy (data, lh+1, len);
1427
1428         if (debug) {
1429                 log(LOG_DEBUG, SPP_FMT "%s output <%s id=0x%x len=%d",
1430                     SPP_ARGS(ifp),
1431                     sppp_proto_name(proto),
1432                     sppp_cp_type_name (lh->type), lh->ident,
1433                     ntohs (lh->len));
1434                 sppp_print_bytes ((u_char*) (lh+1), len);
1435                 log(-1, ">\n");
1436         }
1437         if (IF_QFULL (&sp->pp_cpq)) {
1438                 IF_DROP (&sp->pp_fastq);
1439                 IF_DROP (&ifp->if_snd);
1440                 m_freem (m);
1441                 ++ifp->if_oerrors;
1442         } else
1443                 IF_ENQUEUE (&sp->pp_cpq, m);
1444         if (! (ifp->if_flags & IFF_OACTIVE))
1445                 (*ifp->if_start) (ifp);
1446         ifp->if_obytes += m->m_pkthdr.len + 3;
1447 }
1448
1449 /*
1450  * Handle incoming PPP control protocol packets.
1451  */
1452 static void
1453 sppp_cp_input(const struct cp *cp, struct sppp *sp, struct mbuf *m)
1454 {
1455         STDDCL;
1456         struct lcp_header *h;
1457         int printlen, len = m->m_pkthdr.len;
1458         int rv;
1459         u_char *p;
1460
1461         if (len < 4) {
1462                 if (debug)
1463                         log(LOG_DEBUG,
1464                             SPP_FMT "%s invalid packet length: %d bytes\n",
1465                             SPP_ARGS(ifp), cp->name, len);
1466                 return;
1467         }
1468         h = mtod (m, struct lcp_header*);
1469         if (debug) {
1470                 printlen = ntohs(h->len);
1471                 log(LOG_DEBUG,
1472                     SPP_FMT "%s input(%s): <%s id=0x%x len=%d",
1473                     SPP_ARGS(ifp), cp->name,
1474                     sppp_state_name(sp->state[cp->protoidx]),
1475                     sppp_cp_type_name (h->type), h->ident, printlen);
1476                 if (len < printlen)
1477                         printlen = len;
1478                 if (printlen > 4)
1479                         sppp_print_bytes ((u_char*) (h+1), printlen - 4);
1480                 log(-1, ">\n");
1481         }
1482         if (len > ntohs (h->len))
1483                 len = ntohs (h->len);
1484         p = (u_char *)(h + 1);
1485         switch (h->type) {
1486         case CONF_REQ:
1487                 if (len < 4) {
1488                         if (debug)
1489                                 log(-1, SPP_FMT "%s invalid conf-req length %d\n",
1490                                        SPP_ARGS(ifp), cp->name,
1491                                        len);
1492                         ++ifp->if_ierrors;
1493                         break;
1494                 }
1495                 /* handle states where RCR doesn't get a SCA/SCN */
1496                 switch (sp->state[cp->protoidx]) {
1497                 case STATE_CLOSING:
1498                 case STATE_STOPPING:
1499                         return;
1500                 case STATE_CLOSED:
1501                         sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident,
1502                                      0, 0);
1503                         return;
1504                 }
1505                 rv = (cp->RCR)(sp, h, len);
1506                 if (rv < 0) {
1507                         /* fatal error, shut down */
1508                         (cp->tld)(sp);
1509                         sppp_lcp_tlf(sp);
1510                         return;
1511                 }
1512                 switch (sp->state[cp->protoidx]) {
1513                 case STATE_OPENED:
1514                         (cp->tld)(sp);
1515                         (cp->scr)(sp);
1516                         /* fall through... */
1517                 case STATE_ACK_SENT:
1518                 case STATE_REQ_SENT:
1519                         /*
1520                          * sppp_cp_change_state() have the side effect of
1521                          * restarting the timeouts. We want to avoid that
1522                          * if the state don't change, otherwise we won't
1523                          * ever timeout and resend a configuration request
1524                          * that got lost.
1525                          */
1526                         if (sp->state[cp->protoidx] == (rv ? STATE_ACK_SENT:
1527                             STATE_REQ_SENT))
1528                                 break;
1529                         sppp_cp_change_state(cp, sp, rv?
1530                                              STATE_ACK_SENT: STATE_REQ_SENT);
1531                         break;
1532                 case STATE_STOPPED:
1533                         sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1534                         (cp->scr)(sp);
1535                         sppp_cp_change_state(cp, sp, rv?
1536                                              STATE_ACK_SENT: STATE_REQ_SENT);
1537                         break;
1538                 case STATE_ACK_RCVD:
1539                         if (rv) {
1540                                 sppp_cp_change_state(cp, sp, STATE_OPENED);
1541                                 if (debug)
1542                                         log(LOG_DEBUG, SPP_FMT "%s tlu\n",
1543                                             SPP_ARGS(ifp),
1544                                             cp->name);
1545                                 (cp->tlu)(sp);
1546                         } else
1547                                 sppp_cp_change_state(cp, sp, STATE_ACK_RCVD);
1548                         break;
1549                 default:
1550                         kprintf(SPP_FMT "%s illegal %s in state %s\n",
1551                                SPP_ARGS(ifp), cp->name,
1552                                sppp_cp_type_name(h->type),
1553                                sppp_state_name(sp->state[cp->protoidx]));
1554                         ++ifp->if_ierrors;
1555                 }
1556                 break;
1557         case CONF_ACK:
1558                 if (h->ident != sp->confid[cp->protoidx]) {
1559                         if (debug)
1560                                 log(-1, SPP_FMT "%s id mismatch 0x%x != 0x%x\n",
1561                                        SPP_ARGS(ifp), cp->name,
1562                                        h->ident, sp->confid[cp->protoidx]);
1563                         ++ifp->if_ierrors;
1564                         break;
1565                 }
1566                 switch (sp->state[cp->protoidx]) {
1567                 case STATE_CLOSED:
1568                 case STATE_STOPPED:
1569                         sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0);
1570                         break;
1571                 case STATE_CLOSING:
1572                 case STATE_STOPPING:
1573                         break;
1574                 case STATE_REQ_SENT:
1575                         sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1576                         sppp_cp_change_state(cp, sp, STATE_ACK_RCVD);
1577                         break;
1578                 case STATE_OPENED:
1579                         (cp->tld)(sp);
1580                         /* fall through */
1581                 case STATE_ACK_RCVD:
1582                         (cp->scr)(sp);
1583                         sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1584                         break;
1585                 case STATE_ACK_SENT:
1586                         sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1587                         sppp_cp_change_state(cp, sp, STATE_OPENED);
1588                         if (debug)
1589                                 log(LOG_DEBUG, SPP_FMT "%s tlu\n",
1590                                        SPP_ARGS(ifp), cp->name);
1591                         (cp->tlu)(sp);
1592                         break;
1593                 default:
1594                         kprintf(SPP_FMT "%s illegal %s in state %s\n",
1595                                SPP_ARGS(ifp), cp->name,
1596                                sppp_cp_type_name(h->type),
1597                                sppp_state_name(sp->state[cp->protoidx]));
1598                         ++ifp->if_ierrors;
1599                 }
1600                 break;
1601         case CONF_NAK:
1602         case CONF_REJ:
1603                 if (h->ident != sp->confid[cp->protoidx]) {
1604                         if (debug)
1605                                 log(-1, SPP_FMT "%s id mismatch 0x%x != 0x%x\n",
1606                                        SPP_ARGS(ifp), cp->name,
1607                                        h->ident, sp->confid[cp->protoidx]);
1608                         ++ifp->if_ierrors;
1609                         break;
1610                 }
1611                 if (h->type == CONF_NAK)
1612                         (cp->RCN_nak)(sp, h, len);
1613                 else /* CONF_REJ */
1614                         (cp->RCN_rej)(sp, h, len);
1615
1616                 switch (sp->state[cp->protoidx]) {
1617                 case STATE_CLOSED:
1618                 case STATE_STOPPED:
1619                         sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0);
1620                         break;
1621                 case STATE_REQ_SENT:
1622                 case STATE_ACK_SENT:
1623                         sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1624                         /*
1625                          * Slow things down a bit if we think we might be
1626                          * in loopback. Depend on the timeout to send the
1627                          * next configuration request.
1628                          */
1629                         if (sp->pp_loopcnt)
1630                                 break;
1631                         (cp->scr)(sp);
1632                         break;
1633                 case STATE_OPENED:
1634                         (cp->tld)(sp);
1635                         /* fall through */
1636                 case STATE_ACK_RCVD:
1637                         sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1638                         (cp->scr)(sp);
1639                         break;
1640                 case STATE_CLOSING:
1641                 case STATE_STOPPING:
1642                         break;
1643                 default:
1644                         kprintf(SPP_FMT "%s illegal %s in state %s\n",
1645                                SPP_ARGS(ifp), cp->name,
1646                                sppp_cp_type_name(h->type),
1647                                sppp_state_name(sp->state[cp->protoidx]));
1648                         ++ifp->if_ierrors;
1649                 }
1650                 break;
1651
1652         case TERM_REQ:
1653                 switch (sp->state[cp->protoidx]) {
1654                 case STATE_ACK_RCVD:
1655                 case STATE_ACK_SENT:
1656                         sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1657                         /* fall through */
1658                 case STATE_CLOSED:
1659                 case STATE_STOPPED:
1660                 case STATE_CLOSING:
1661                 case STATE_STOPPING:
1662                 case STATE_REQ_SENT:
1663                   sta:
1664                         /* Send Terminate-Ack packet. */
1665                         if (debug)
1666                                 log(LOG_DEBUG, SPP_FMT "%s send terminate-ack\n",
1667                                     SPP_ARGS(ifp), cp->name);
1668                         sppp_cp_send(sp, cp->proto, TERM_ACK, h->ident, 0, 0);
1669                         break;
1670                 case STATE_OPENED:
1671                         (cp->tld)(sp);
1672                         sp->rst_counter[cp->protoidx] = 0;
1673                         sppp_cp_change_state(cp, sp, STATE_STOPPING);
1674                         goto sta;
1675                         break;
1676                 default:
1677                         kprintf(SPP_FMT "%s illegal %s in state %s\n",
1678                                SPP_ARGS(ifp), cp->name,
1679                                sppp_cp_type_name(h->type),
1680                                sppp_state_name(sp->state[cp->protoidx]));
1681                         ++ifp->if_ierrors;
1682                 }
1683                 break;
1684         case TERM_ACK:
1685                 switch (sp->state[cp->protoidx]) {
1686                 case STATE_CLOSED:
1687                 case STATE_STOPPED:
1688                 case STATE_REQ_SENT:
1689                 case STATE_ACK_SENT:
1690                         break;
1691                 case STATE_CLOSING:
1692                         sppp_cp_change_state(cp, sp, STATE_CLOSED);
1693                         (cp->tlf)(sp);
1694                         break;
1695                 case STATE_STOPPING:
1696                         sppp_cp_change_state(cp, sp, STATE_STOPPED);
1697                         (cp->tlf)(sp);
1698                         break;
1699                 case STATE_ACK_RCVD:
1700                         sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1701                         break;
1702                 case STATE_OPENED:
1703                         (cp->tld)(sp);
1704                         (cp->scr)(sp);
1705                         sppp_cp_change_state(cp, sp, STATE_ACK_RCVD);
1706                         break;
1707                 default:
1708                         kprintf(SPP_FMT "%s illegal %s in state %s\n",
1709                                SPP_ARGS(ifp), cp->name,
1710                                sppp_cp_type_name(h->type),
1711                                sppp_state_name(sp->state[cp->protoidx]));
1712                         ++ifp->if_ierrors;
1713                 }
1714                 break;
1715         case CODE_REJ:
1716                 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */
1717                 log(LOG_INFO,
1718                     SPP_FMT "%s: ignoring RXJ (%s) for proto 0x%x, "
1719                     "danger will robinson\n",
1720                     SPP_ARGS(ifp), cp->name,
1721                     sppp_cp_type_name(h->type), ntohs(*((u_short *)p)));
1722                 switch (sp->state[cp->protoidx]) {
1723                 case STATE_CLOSED:
1724                 case STATE_STOPPED:
1725                 case STATE_REQ_SENT:
1726                 case STATE_ACK_SENT:
1727                 case STATE_CLOSING:
1728                 case STATE_STOPPING:
1729                 case STATE_OPENED:
1730                         break;
1731                 case STATE_ACK_RCVD:
1732                         sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1733                         break;
1734                 default:
1735                         kprintf(SPP_FMT "%s illegal %s in state %s\n",
1736                                SPP_ARGS(ifp), cp->name,
1737                                sppp_cp_type_name(h->type),
1738                                sppp_state_name(sp->state[cp->protoidx]));
1739                         ++ifp->if_ierrors;
1740                 }
1741                 break;
1742         case PROTO_REJ:
1743             {
1744                 int catastrophic;
1745                 const struct cp *upper;
1746                 int i;
1747                 u_int16_t proto;
1748
1749                 catastrophic = 0;
1750                 upper = NULL;
1751                 proto = ntohs(*((u_int16_t *)p));
1752                 for (i = 0; i < IDX_COUNT; i++) {
1753                         if (cps[i]->proto == proto) {
1754                                 upper = cps[i];
1755                                 break;
1756                         }
1757                 }
1758                 if (upper == NULL)
1759                         catastrophic++;
1760
1761                 if (catastrophic || debug)
1762                         log(catastrophic? LOG_INFO: LOG_DEBUG,
1763                             SPP_FMT "%s: RXJ%c (%s) for proto 0x%x (%s/%s)\n",
1764                             SPP_ARGS(ifp), cp->name, catastrophic ? '-' : '+',
1765                             sppp_cp_type_name(h->type), proto,
1766                             upper ? upper->name : "unknown",
1767                             upper ? sppp_state_name(sp->state[upper->protoidx]) : "?");
1768
1769                 /*
1770                  * if we got RXJ+ against conf-req, the peer does not implement
1771                  * this particular protocol type.  terminate the protocol.
1772                  */
1773                 if (upper && !catastrophic) {
1774                         if (sp->state[upper->protoidx] == STATE_REQ_SENT) {
1775                                 upper->Close(sp);
1776                                 break;
1777                         }
1778                 }
1779
1780                 /* XXX catastrophic rejects (RXJ-) aren't handled yet. */
1781                 switch (sp->state[cp->protoidx]) {
1782                 case STATE_CLOSED:
1783                 case STATE_STOPPED:
1784                 case STATE_REQ_SENT:
1785                 case STATE_ACK_SENT:
1786                 case STATE_CLOSING:
1787                 case STATE_STOPPING:
1788                 case STATE_OPENED:
1789                         break;
1790                 case STATE_ACK_RCVD:
1791                         sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1792                         break;
1793                 default:
1794                         kprintf(SPP_FMT "%s illegal %s in state %s\n",
1795                                SPP_ARGS(ifp), cp->name,
1796                                sppp_cp_type_name(h->type),
1797                                sppp_state_name(sp->state[cp->protoidx]));
1798                         ++ifp->if_ierrors;
1799                 }
1800                 break;
1801             }
1802         case DISC_REQ:
1803                 if (cp->proto != PPP_LCP)
1804                         goto illegal;
1805                 /* Discard the packet. */
1806                 break;
1807         case ECHO_REQ:
1808                 if (cp->proto != PPP_LCP)
1809                         goto illegal;
1810                 if (sp->state[cp->protoidx] != STATE_OPENED) {
1811                         if (debug)
1812                                 log(-1, SPP_FMT "lcp echo req but lcp closed\n",
1813                                        SPP_ARGS(ifp));
1814                         ++ifp->if_ierrors;
1815                         break;
1816                 }
1817                 if (len < 8) {
1818                         if (debug)
1819                                 log(-1, SPP_FMT "invalid lcp echo request "
1820                                        "packet length: %d bytes\n",
1821                                        SPP_ARGS(ifp), len);
1822                         break;
1823                 }
1824                 if ((sp->lcp.opts & (1 << LCP_OPT_MAGIC)) &&
1825                     ntohl (*(long*)(h+1)) == sp->lcp.magic) {
1826                         /* Line loopback mode detected. */
1827                         kprintf(SPP_FMT "loopback\n", SPP_ARGS(ifp));
1828                         sp->pp_loopcnt = MAXALIVECNT * 5;
1829                         if_down (ifp);
1830                         IF_DRAIN(&sp->pp_cpq);
1831
1832                         /* Shut down the PPP link. */
1833                         /* XXX */
1834                         lcp.Down(sp);
1835                         lcp.Up(sp);
1836                         break;
1837                 }
1838                 *(long*)(h+1) = htonl (sp->lcp.magic);
1839                 if (debug)
1840                         log(-1, SPP_FMT "got lcp echo req, sending echo rep\n",
1841                                SPP_ARGS(ifp));
1842                 sppp_cp_send (sp, PPP_LCP, ECHO_REPLY, h->ident, len-4, h+1);
1843                 break;
1844         case ECHO_REPLY:
1845                 if (cp->proto != PPP_LCP)
1846                         goto illegal;
1847                 if (h->ident != sp->lcp.echoid) {
1848                         ++ifp->if_ierrors;
1849                         break;
1850                 }
1851                 if (len < 8) {
1852                         if (debug)
1853                                 log(-1, SPP_FMT "lcp invalid echo reply "
1854                                        "packet length: %d bytes\n",
1855                                        SPP_ARGS(ifp), len);
1856                         break;
1857                 }
1858                 if (debug)
1859                         log(-1, SPP_FMT "lcp got echo rep\n",
1860                                SPP_ARGS(ifp));
1861                 if (!(sp->lcp.opts & (1 << LCP_OPT_MAGIC)) ||
1862                     ntohl (*(long*)(h+1)) != sp->lcp.magic)
1863                         sp->pp_alivecnt = 0;
1864                 break;
1865         default:
1866                 /* Unknown packet type -- send Code-Reject packet. */
1867           illegal:
1868                 if (debug)
1869                         log(-1, SPP_FMT "%s send code-rej for 0x%x\n",
1870                                SPP_ARGS(ifp), cp->name, h->type);
1871                 sppp_cp_send(sp, cp->proto, CODE_REJ,
1872                              ++sp->pp_seq[cp->protoidx], m->m_pkthdr.len, h);
1873                 ++ifp->if_ierrors;
1874         }
1875 }
1876
1877
1878 /*
1879  * The generic part of all Up/Down/Open/Close/TO event handlers.
1880  * Basically, the state transition handling in the automaton.
1881  */
1882 static void
1883 sppp_up_event(const struct cp *cp, struct sppp *sp)
1884 {
1885         STDDCL;
1886
1887         if (debug)
1888                 log(LOG_DEBUG, SPP_FMT "%s up(%s)\n",
1889                     SPP_ARGS(ifp), cp->name,
1890                     sppp_state_name(sp->state[cp->protoidx]));
1891
1892         switch (sp->state[cp->protoidx]) {
1893         case STATE_INITIAL:
1894                 sppp_cp_change_state(cp, sp, STATE_CLOSED);
1895                 break;
1896         case STATE_STARTING:
1897                 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1898                 (cp->scr)(sp);
1899                 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1900                 break;
1901         default:
1902                 kprintf(SPP_FMT "%s illegal up in state %s\n",
1903                        SPP_ARGS(ifp), cp->name,
1904                        sppp_state_name(sp->state[cp->protoidx]));
1905         }
1906 }
1907
1908 static void
1909 sppp_down_event(const struct cp *cp, struct sppp *sp)
1910 {
1911         STDDCL;
1912
1913         if (debug)
1914                 log(LOG_DEBUG, SPP_FMT "%s down(%s)\n",
1915                     SPP_ARGS(ifp), cp->name,
1916                     sppp_state_name(sp->state[cp->protoidx]));
1917
1918         switch (sp->state[cp->protoidx]) {
1919         case STATE_CLOSED:
1920         case STATE_CLOSING:
1921                 sppp_cp_change_state(cp, sp, STATE_INITIAL);
1922                 break;
1923         case STATE_STOPPED:
1924                 sppp_cp_change_state(cp, sp, STATE_STARTING);
1925                 (cp->tls)(sp);
1926                 break;
1927         case STATE_STOPPING:
1928         case STATE_REQ_SENT:
1929         case STATE_ACK_RCVD:
1930         case STATE_ACK_SENT:
1931                 sppp_cp_change_state(cp, sp, STATE_STARTING);
1932                 break;
1933         case STATE_OPENED:
1934                 (cp->tld)(sp);
1935                 sppp_cp_change_state(cp, sp, STATE_STARTING);
1936                 break;
1937         default:
1938                 kprintf(SPP_FMT "%s illegal down in state %s\n",
1939                        SPP_ARGS(ifp), cp->name,
1940                        sppp_state_name(sp->state[cp->protoidx]));
1941         }
1942 }
1943
1944
1945 static void
1946 sppp_open_event(const struct cp *cp, struct sppp *sp)
1947 {
1948         STDDCL;
1949
1950         if (debug)
1951                 log(LOG_DEBUG, SPP_FMT "%s open(%s)\n",
1952                     SPP_ARGS(ifp), cp->name,
1953                     sppp_state_name(sp->state[cp->protoidx]));
1954
1955         switch (sp->state[cp->protoidx]) {
1956         case STATE_INITIAL:
1957                 sppp_cp_change_state(cp, sp, STATE_STARTING);
1958                 (cp->tls)(sp);
1959                 break;
1960         case STATE_STARTING:
1961                 break;
1962         case STATE_CLOSED:
1963                 sp->rst_counter[cp->protoidx] = sp->lcp.max_configure;
1964                 (cp->scr)(sp);
1965                 sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
1966                 break;
1967         case STATE_STOPPED:
1968                 /*
1969                  * Try escaping stopped state.  This seems to bite
1970                  * people occasionally, in particular for IPCP,
1971                  * presumably following previous IPCP negotiation
1972                  * aborts.  Somehow, we must have missed a Down event
1973                  * which would have caused a transition into starting
1974                  * state, so as a bandaid we force the Down event now.
1975                  * This effectively implements (something like the)
1976                  * `restart' option mentioned in the state transition
1977                  * table of RFC 1661.
1978                  */
1979                 sppp_cp_change_state(cp, sp, STATE_STARTING);
1980                 (cp->tls)(sp);
1981                 break;
1982         case STATE_STOPPING:
1983         case STATE_REQ_SENT:
1984         case STATE_ACK_RCVD:
1985         case STATE_ACK_SENT:
1986         case STATE_OPENED:
1987                 break;
1988         case STATE_CLOSING:
1989                 sppp_cp_change_state(cp, sp, STATE_STOPPING);
1990                 break;
1991         }
1992 }
1993
1994
1995 static void
1996 sppp_close_event(const struct cp *cp, struct sppp *sp)
1997 {
1998         STDDCL;
1999
2000         if (debug)
2001                 log(LOG_DEBUG, SPP_FMT "%s close(%s)\n",
2002                     SPP_ARGS(ifp), cp->name,
2003                     sppp_state_name(sp->state[cp->protoidx]));
2004
2005         switch (sp->state[cp->protoidx]) {
2006         case STATE_INITIAL:
2007         case STATE_CLOSED:
2008         case STATE_CLOSING:
2009                 break;
2010         case STATE_STARTING:
2011                 sppp_cp_change_state(cp, sp, STATE_INITIAL);
2012                 (cp->tlf)(sp);
2013                 break;
2014         case STATE_STOPPED:
2015                 sppp_cp_change_state(cp, sp, STATE_CLOSED);
2016                 break;
2017         case STATE_STOPPING:
2018                 sppp_cp_change_state(cp, sp, STATE_CLOSING);
2019                 break;
2020         case STATE_OPENED:
2021                 (cp->tld)(sp);
2022                 /* fall through */
2023         case STATE_REQ_SENT:
2024         case STATE_ACK_RCVD:
2025         case STATE_ACK_SENT:
2026                 sp->rst_counter[cp->protoidx] = sp->lcp.max_terminate;
2027                 sppp_cp_send(sp, cp->proto, TERM_REQ,
2028                              ++sp->pp_seq[cp->protoidx], 0, 0);
2029                 sppp_cp_change_state(cp, sp, STATE_CLOSING);
2030                 break;
2031         }
2032 }
2033
2034 static void
2035 sppp_to_event(const struct cp *cp, struct sppp *sp)
2036 {
2037         STDDCL;
2038
2039         crit_enter();
2040
2041         if (debug)
2042                 log(LOG_DEBUG, SPP_FMT "%s TO(%s) rst_counter = %d\n",
2043                     SPP_ARGS(ifp), cp->name,
2044                     sppp_state_name(sp->state[cp->protoidx]),
2045                     sp->rst_counter[cp->protoidx]);
2046
2047         if (--sp->rst_counter[cp->protoidx] < 0)
2048                 /* TO- event */
2049                 switch (sp->state[cp->protoidx]) {
2050                 case STATE_CLOSING:
2051                         sppp_cp_change_state(cp, sp, STATE_CLOSED);
2052                         (cp->tlf)(sp);
2053                         break;
2054                 case STATE_STOPPING:
2055                         sppp_cp_change_state(cp, sp, STATE_STOPPED);
2056                         (cp->tlf)(sp);
2057                         break;
2058                 case STATE_REQ_SENT:
2059                 case STATE_ACK_RCVD:
2060                 case STATE_ACK_SENT:
2061                         sppp_cp_change_state(cp, sp, STATE_STOPPED);
2062                         (cp->tlf)(sp);
2063                         break;
2064                 }
2065         else
2066                 /* TO+ event */
2067                 switch (sp->state[cp->protoidx]) {
2068                 case STATE_CLOSING:
2069                 case STATE_STOPPING:
2070                         sppp_cp_send(sp, cp->proto, TERM_REQ,
2071                                      ++sp->pp_seq[cp->protoidx], 0, 0);
2072                         callout_reset(&sp->timeout[cp->protoidx],
2073                                         sp->lcp.timeout, cp->TO, sp);
2074                         break;
2075                 case STATE_REQ_SENT:
2076                 case STATE_ACK_RCVD:
2077                         (cp->scr)(sp);
2078                         /* sppp_cp_change_state() will restart the timer */
2079                         sppp_cp_change_state(cp, sp, STATE_REQ_SENT);
2080                         break;
2081                 case STATE_ACK_SENT:
2082                         (cp->scr)(sp);
2083                         callout_reset(&sp->timeout[cp->protoidx],
2084                                         sp->lcp.timeout, cp->TO, sp);
2085                         break;
2086                 }
2087
2088         crit_exit();
2089 }
2090
2091 /*
2092  * Change the state of a control protocol in the state automaton.
2093  * Takes care of starting/stopping the restart timer.
2094  */
2095 void
2096 sppp_cp_change_state(const struct cp *cp, struct sppp *sp, int newstate)
2097 {
2098         sp->state[cp->protoidx] = newstate;
2099         callout_stop(&sp->timeout[cp->protoidx]);
2100
2101         switch (newstate) {
2102         case STATE_INITIAL:
2103         case STATE_STARTING:
2104         case STATE_CLOSED:
2105         case STATE_STOPPED:
2106         case STATE_OPENED:
2107                 break;
2108         case STATE_CLOSING:
2109         case STATE_STOPPING:
2110         case STATE_REQ_SENT:
2111         case STATE_ACK_RCVD:
2112         case STATE_ACK_SENT:
2113                 callout_reset(&sp->timeout[cp->protoidx], 
2114                                 sp->lcp.timeout, cp->TO, sp);
2115                 break;
2116         }
2117 }
2118
2119 /*
2120  *--------------------------------------------------------------------------*
2121  *                                                                          *
2122  *                         The LCP implementation.                          *
2123  *                                                                          *
2124  *--------------------------------------------------------------------------*
2125  */
2126 static void
2127 sppp_lcp_init(struct sppp *sp)
2128 {
2129         sp->lcp.opts = (1 << LCP_OPT_MAGIC);
2130         sp->lcp.magic = 0;
2131         sp->state[IDX_LCP] = STATE_INITIAL;
2132         sp->fail_counter[IDX_LCP] = 0;
2133         sp->pp_seq[IDX_LCP] = 0;
2134         sp->pp_rseq[IDX_LCP] = 0;
2135         sp->lcp.protos = 0;
2136         sp->lcp.mru = sp->lcp.their_mru = PP_MTU;
2137
2138         /* Note that these values are  relevant for all control protocols */
2139         sp->lcp.timeout = 3 * hz;
2140         sp->lcp.max_terminate = 2;
2141         sp->lcp.max_configure = 10;
2142         sp->lcp.max_failure = 10;
2143 #if defined(__DragonFly__)
2144         callout_init(&sp->timeout[IDX_LCP]);
2145 #endif
2146 }
2147
2148 static void
2149 sppp_lcp_up(struct sppp *sp)
2150 {
2151         STDDCL;
2152
2153         sp->pp_alivecnt = 0;
2154         sp->lcp.opts = (1 << LCP_OPT_MAGIC);
2155         sp->lcp.magic = 0;
2156         sp->lcp.protos = 0;
2157         sp->lcp.mru = sp->lcp.their_mru = PP_MTU;
2158         /*
2159          * If this interface is passive or dial-on-demand, and we are
2160          * still in Initial state, it means we've got an incoming
2161          * call.  Activate the interface.
2162          */
2163         if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) != 0) {
2164                 if (debug)
2165                         log(LOG_DEBUG,
2166                             SPP_FMT "Up event", SPP_ARGS(ifp));
2167                 ifp->if_flags |= IFF_RUNNING;
2168                 if (sp->state[IDX_LCP] == STATE_INITIAL) {
2169                         if (debug)
2170                                 log(-1, "(incoming call)\n");
2171                         sp->pp_flags |= PP_CALLIN;
2172                         lcp.Open(sp);
2173                 } else if (debug)
2174                         log(-1, "\n");
2175         } else if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0 &&
2176                    (sp->state[IDX_LCP] == STATE_INITIAL)) {
2177                 ifp->if_flags |= IFF_RUNNING;
2178                 lcp.Open(sp);
2179         }
2180
2181         sppp_up_event(&lcp, sp);
2182 }
2183
2184 static void
2185 sppp_lcp_down(struct sppp *sp)
2186 {
2187         STDDCL;
2188
2189         sppp_down_event(&lcp, sp);
2190
2191         /*
2192          * If this is neither a dial-on-demand nor a passive
2193          * interface, simulate an ``ifconfig down'' action, so the
2194          * administrator can force a redial by another ``ifconfig
2195          * up''.  XXX For leased line operation, should we immediately
2196          * try to reopen the connection here?
2197          */
2198         if ((ifp->if_flags & (IFF_AUTO | IFF_PASSIVE)) == 0) {
2199                 log(LOG_INFO,
2200                     SPP_FMT "Down event, taking interface down.\n",
2201                     SPP_ARGS(ifp));
2202                 if_down(ifp);
2203         } else {
2204                 if (debug)
2205                         log(LOG_DEBUG,
2206                             SPP_FMT "Down event (carrier loss)\n",
2207                             SPP_ARGS(ifp));
2208                 sp->pp_flags &= ~PP_CALLIN;
2209                 if (sp->state[IDX_LCP] != STATE_INITIAL)
2210                         lcp.Close(sp);
2211                 ifp->if_flags &= ~IFF_RUNNING;
2212         }
2213 }
2214
2215 static void
2216 sppp_lcp_open(struct sppp *sp)
2217 {
2218         /*
2219          * If we are authenticator, negotiate LCP_AUTH
2220          */
2221         if (sp->hisauth.proto != 0)
2222                 sp->lcp.opts |= (1 << LCP_OPT_AUTH_PROTO);
2223         else
2224                 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO);
2225         sp->pp_flags &= ~PP_NEEDAUTH;
2226         sppp_open_event(&lcp, sp);
2227 }
2228
2229 static void
2230 sppp_lcp_close(struct sppp *sp)
2231 {
2232         sppp_close_event(&lcp, sp);
2233 }
2234
2235 static void
2236 sppp_lcp_TO(void *cookie)
2237 {
2238         sppp_to_event(&lcp, (struct sppp *)cookie);
2239 }
2240
2241 /*
2242  * Analyze a configure request.  Return true if it was agreeable, and
2243  * caused action sca, false if it has been rejected or nak'ed, and
2244  * caused action scn.  (The return value is used to make the state
2245  * transition decision in the state automaton.)
2246  */
2247 static int
2248 sppp_lcp_RCR(struct sppp *sp, struct lcp_header *h, int len)
2249 {
2250         STDDCL;
2251         u_char *buf, *r, *p;
2252         int origlen, rlen;
2253         u_long nmagic;
2254         u_short authproto;
2255
2256         len -= 4;
2257         origlen = len;
2258         buf = r = kmalloc (len, M_TEMP, M_INTWAIT);
2259
2260         if (debug)
2261                 log(LOG_DEBUG, SPP_FMT "lcp parse opts: ",
2262                     SPP_ARGS(ifp));
2263
2264         /* pass 1: check for things that need to be rejected */
2265         p = (void*) (h+1);
2266         for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) {
2267                 /* Sanity check option length */
2268                 if (p[1] > len) {
2269                         /* Malicious option - drop immediately.
2270                          * XXX Maybe we should just RXJ it?
2271                          */
2272                          log(-1, "%s: received malicious LCP option 0x%02x, "
2273                              "length 0x%02x, (len: 0x%02x) dropping.\n", ifp->if_xname,
2274                              p[0], p[1], len);
2275                         goto drop;
2276                 }
2277                 if (debug)
2278                         log(-1, " %s ", sppp_lcp_opt_name(*p));
2279                 switch (*p) {
2280                 case LCP_OPT_MAGIC:
2281                         /* Magic number. */
2282                         if (len >= 6 && p[1] == 6)
2283                                 continue;
2284                         if (debug)
2285                                 log(-1, "[invalid] ");
2286                         break;
2287                 case LCP_OPT_ASYNC_MAP:
2288                         /* Async control character map. */
2289                         if (len >= 6 && p[1] == 6)
2290                                 continue;
2291                         if (debug)
2292                                 log(-1, "[invalid] ");
2293                         break;
2294                 case LCP_OPT_MRU:
2295                         /* Maximum receive unit. */
2296                         if (len >= 4 && p[1] == 4)
2297                                 continue;
2298                         if (debug)
2299                                 log(-1, "[invalid] ");
2300                         break;
2301                 case LCP_OPT_AUTH_PROTO:
2302                         if (len < 4) {
2303                                 if (debug)
2304                                         log(-1, "[invalid] ");
2305                                 break;
2306                         }
2307                         authproto = (p[2] << 8) + p[3];
2308                         if (authproto == PPP_CHAP && p[1] != 5) {
2309                                 if (debug)
2310                                         log(-1, "[invalid chap len] ");
2311                                 break;
2312                         }
2313                         if (sp->myauth.proto == 0) {
2314                                 /* we are not configured to do auth */
2315                                 if (debug)
2316                                         log(-1, "[not configured] ");
2317                                 break;
2318                         }
2319                         /*
2320                          * Remote want us to authenticate, remember this,
2321                          * so we stay in PHASE_AUTHENTICATE after LCP got
2322                          * up.
2323                          */
2324                         sp->pp_flags |= PP_NEEDAUTH;
2325                         continue;
2326                 default:
2327                         /* Others not supported. */
2328                         if (debug)
2329                                 log(-1, "[rej] ");
2330                         break;
2331                 }
2332                 /* Add the option to rejected list. */
2333                 bcopy (p, r, p[1]);
2334                 r += p[1];
2335                 rlen += p[1];
2336         }
2337         if (rlen) {
2338                 if (debug)
2339                         log(-1, " send conf-rej\n");
2340                 sppp_cp_send (sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf);
2341                 return 0;
2342         } else if (debug)
2343                 log(-1, "\n");
2344
2345         /*
2346          * pass 2: check for option values that are unacceptable and
2347          * thus require to be nak'ed.
2348          */
2349         if (debug)
2350                 log(LOG_DEBUG, SPP_FMT "lcp parse opt values: ",
2351                     SPP_ARGS(ifp));
2352
2353         p = (void*) (h+1);
2354         len = origlen;
2355         for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) {
2356                 if (debug)
2357                         log(-1, " %s ", sppp_lcp_opt_name(*p));
2358                 switch (*p) {
2359                 case LCP_OPT_MAGIC:
2360                         /* Magic number -- extract. */
2361                         nmagic = (u_long)p[2] << 24 |
2362                                 (u_long)p[3] << 16 | p[4] << 8 | p[5];
2363                         if (nmagic != sp->lcp.magic) {
2364                                 sp->pp_loopcnt = 0;
2365                                 if (debug)
2366                                         log(-1, "0x%lx ", nmagic);
2367                                 continue;
2368                         }
2369                         if (debug && sp->pp_loopcnt < MAXALIVECNT*5)
2370                                 log(-1, "[glitch] ");
2371                         ++sp->pp_loopcnt;
2372                         /*
2373                          * We negate our magic here, and NAK it.  If
2374                          * we see it later in an NAK packet, we
2375                          * suggest a new one.
2376                          */
2377                         nmagic = ~sp->lcp.magic;
2378                         /* Gonna NAK it. */
2379                         p[2] = nmagic >> 24;
2380                         p[3] = nmagic >> 16;
2381                         p[4] = nmagic >> 8;
2382                         p[5] = nmagic;
2383                         break;
2384
2385                 case LCP_OPT_ASYNC_MAP:
2386                         /*
2387                          * Async control character map -- just ignore it.
2388                          *
2389                          * Quote from RFC 1662, chapter 6:
2390                          * To enable this functionality, synchronous PPP
2391                          * implementations MUST always respond to the
2392                          * Async-Control-Character-Map Configuration
2393                          * Option with the LCP Configure-Ack.  However,
2394                          * acceptance of the Configuration Option does
2395                          * not imply that the synchronous implementation
2396                          * will do any ACCM mapping.  Instead, all such
2397                          * octet mapping will be performed by the
2398                          * asynchronous-to-synchronous converter.
2399                          */
2400                         continue;
2401
2402                 case LCP_OPT_MRU:
2403                         /*
2404                          * Maximum receive unit.  Always agreeable,
2405                          * but ignored by now.
2406                          */
2407                         sp->lcp.their_mru = p[2] * 256 + p[3];
2408                         if (debug)
2409                                 log(-1, "%lu ", sp->lcp.their_mru);
2410                         continue;
2411
2412                 case LCP_OPT_AUTH_PROTO:
2413                         authproto = (p[2] << 8) + p[3];
2414                         if (sp->myauth.proto != authproto) {
2415                                 /* not agreed, nak */
2416                                 if (debug)
2417                                         log(-1, "[mine %s != his %s] ",
2418                                                sppp_proto_name(sp->hisauth.proto),
2419                                                sppp_proto_name(authproto));
2420                                 p[2] = sp->myauth.proto >> 8;
2421                                 p[3] = sp->myauth.proto;
2422                                 break;
2423                         }
2424                         if (authproto == PPP_CHAP && p[4] != CHAP_MD5) {
2425                                 if (debug)
2426                                         log(-1, "[chap not MD5] ");
2427                                 p[4] = CHAP_MD5;
2428                                 break;
2429                         }
2430                         continue;
2431                 }
2432                 /* Add the option to nak'ed list. */
2433                 bcopy (p, r, p[1]);
2434                 r += p[1];
2435                 rlen += p[1];
2436         }
2437         if (rlen) {
2438                 /*
2439                  * Local and remote magics equal -- loopback?
2440                  */
2441                 if (sp->pp_loopcnt >= MAXALIVECNT*5) {
2442                         if (sp->pp_loopcnt == MAXALIVECNT*5)
2443                                 kprintf (SPP_FMT "loopback\n",
2444                                         SPP_ARGS(ifp));
2445                         if (ifp->if_flags & IFF_UP) {
2446                                 if_down(ifp);
2447                                 IF_DRAIN(&sp->pp_cpq);
2448                                 /* XXX ? */
2449                                 lcp.Down(sp);
2450                                 lcp.Up(sp);
2451                         }
2452                 } else if (++sp->fail_counter[IDX_LCP] >= sp->lcp.max_failure) {
2453                         if (debug)
2454                                 log(-1, " max_failure (%d) exceeded, "
2455                                        "send conf-rej\n",
2456                                        sp->lcp.max_failure);
2457                         sppp_cp_send(sp, PPP_LCP, CONF_REJ, h->ident, rlen, buf);
2458                 } else {
2459                         if (debug)
2460                                 log(-1, " send conf-nak\n");
2461                         sppp_cp_send (sp, PPP_LCP, CONF_NAK, h->ident, rlen, buf);
2462                 }
2463         } else {
2464                 if (debug)
2465                         log(-1, " send conf-ack\n");
2466                 sp->fail_counter[IDX_LCP] = 0;
2467                 sp->pp_loopcnt = 0;
2468                 sppp_cp_send (sp, PPP_LCP, CONF_ACK,
2469                               h->ident, origlen, h+1);
2470         }
2471
2472         kfree (buf, M_TEMP);
2473         return (rlen == 0);
2474
2475 drop:
2476         kfree(buf, M_TEMP);
2477         return (-1);
2478 }
2479
2480 /*
2481  * Analyze the LCP Configure-Reject option list, and adjust our
2482  * negotiation.
2483  */
2484 static void
2485 sppp_lcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
2486 {
2487         STDDCL;
2488         u_char *buf, *p;
2489
2490         len -= 4;
2491         buf = kmalloc (len, M_TEMP, M_INTWAIT);
2492
2493         if (debug)
2494                 log(LOG_DEBUG, SPP_FMT "lcp rej opts: ",
2495                     SPP_ARGS(ifp));
2496
2497         p = (void*) (h+1);
2498         for (; len > 1 && p[1]; len -= p[1], p += p[1]) {
2499                 /* Sanity check option length */
2500                 if (p[1] > len) {
2501                         /*
2502                          * Malicious option - drop immediately.
2503                          * XXX Maybe we should just RXJ it?
2504                          */
2505                         log(-1, "%s: received malicious LCP option, "
2506                             "dropping.\n", ifp->if_xname);
2507                         goto drop;
2508                 }
2509                 if (debug)
2510                         log(-1, " %s ", sppp_lcp_opt_name(*p));
2511                 switch (*p) {
2512                 case LCP_OPT_MAGIC:
2513                         /* Magic number -- can't use it, use 0 */
2514                         sp->lcp.opts &= ~(1 << LCP_OPT_MAGIC);
2515                         sp->lcp.magic = 0;
2516                         break;
2517                 case LCP_OPT_MRU:
2518                         /*
2519                          * Should not be rejected anyway, since we only
2520                          * negotiate a MRU if explicitly requested by
2521                          * peer.
2522                          */
2523                         sp->lcp.opts &= ~(1 << LCP_OPT_MRU);
2524                         break;
2525                 case LCP_OPT_AUTH_PROTO:
2526                         /*
2527                          * Peer doesn't want to authenticate himself,
2528                          * deny unless this is a dialout call, and
2529                          * AUTHFLAG_NOCALLOUT is set.
2530                          */
2531                         if ((sp->pp_flags & PP_CALLIN) == 0 &&
2532                             (sp->hisauth.flags & AUTHFLAG_NOCALLOUT) != 0) {
2533                                 if (debug)
2534                                         log(-1, "[don't insist on auth "
2535                                                "for callout]");
2536                                 sp->lcp.opts &= ~(1 << LCP_OPT_AUTH_PROTO);
2537                                 break;
2538                         }
2539                         if (debug)
2540                                 log(-1, "[access denied]\n");
2541                         lcp.Close(sp);
2542                         break;
2543                 }
2544         }
2545         if (debug)
2546                 log(-1, "\n");
2547 drop:
2548         kfree (buf, M_TEMP);
2549         return;
2550 }
2551
2552 /*
2553  * Analyze the LCP Configure-NAK option list, and adjust our
2554  * negotiation.
2555  */
2556 static void
2557 sppp_lcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
2558 {
2559         STDDCL;
2560         u_char *buf, *p;
2561         u_long magic;
2562
2563         len -= 4;
2564         buf = kmalloc (len, M_TEMP, M_INTWAIT);
2565
2566         if (debug)
2567                 log(LOG_DEBUG, SPP_FMT "lcp nak opts: ",
2568                     SPP_ARGS(ifp));
2569
2570         p = (void*) (h+1);
2571         for (; len > 1 && p[1]; len -= p[1], p += p[1]) {
2572                 /* Sanity check option length */
2573                 if (p[1] > len) {
2574                         /*
2575                          * Malicious option - drop immediately.
2576                          * XXX Maybe we should just RXJ it?
2577                          */
2578                         log(-1, "%s: received malicious LCP option, "
2579                             "dropping.\n", ifp->if_xname);
2580                         goto drop;
2581                 }
2582                 if (debug)
2583                         log(-1, " %s ", sppp_lcp_opt_name(*p));
2584                 switch (*p) {
2585                 case LCP_OPT_MAGIC:
2586                         /* Magic number -- renegotiate */
2587                         if ((sp->lcp.opts & (1 << LCP_OPT_MAGIC)) &&
2588                             len >= 6 && p[1] == 6) {
2589                                 magic = (u_long)p[2] << 24 |
2590                                         (u_long)p[3] << 16 | p[4] << 8 | p[5];
2591                                 /*
2592                                  * If the remote magic is our negated one,
2593                                  * this looks like a loopback problem.
2594                                  * Suggest a new magic to make sure.
2595                                  */
2596                                 if (magic == ~sp->lcp.magic) {
2597                                         if (debug)
2598                                                 log(-1, "magic glitch ");
2599 #if defined(__DragonFly__)
2600                                         sp->lcp.magic = krandom();
2601 #else
2602                                         sp->lcp.magic = time.tv_sec + time.tv_usec;
2603 #endif
2604                                 } else {
2605                                         sp->lcp.magic = magic;
2606                                         if (debug)
2607                                                 log(-1, "%lu ", magic);
2608                                 }
2609                         }
2610                         break;
2611                 case LCP_OPT_MRU:
2612                         /*
2613                          * Peer wants to advise us to negotiate an MRU.
2614                          * Agree on it if it's reasonable, or use
2615                          * default otherwise.
2616                          */
2617                         if (len >= 4 && p[1] == 4) {
2618                                 u_int mru = p[2] * 256 + p[3];
2619                                 if (debug)
2620                                         log(-1, "%d ", mru);
2621                                 if (mru < PP_MTU || mru > PP_MAX_MRU)
2622                                         mru = PP_MTU;
2623                                 sp->lcp.mru = mru;
2624                                 sp->lcp.opts |= (1 << LCP_OPT_MRU);
2625                         }
2626                         break;
2627                 case LCP_OPT_AUTH_PROTO:
2628                         /*
2629                          * Peer doesn't like our authentication method,
2630                          * deny.
2631                          */
2632                         if (debug)
2633                                 log(-1, "[access denied]\n");
2634                         lcp.Close(sp);
2635                         break;
2636                 }
2637         }
2638         if (debug)
2639                 log(-1, "\n");
2640 drop:
2641         kfree (buf, M_TEMP);
2642         return;
2643 }
2644
2645 static void
2646 sppp_lcp_tlu(struct sppp *sp)
2647 {
2648         STDDCL;
2649         int i;
2650         u_long mask;
2651
2652         /* XXX ? */
2653         if (! (ifp->if_flags & IFF_UP) &&
2654             (ifp->if_flags & IFF_RUNNING)) {
2655                 /* Coming out of loopback mode. */
2656                 if_up(ifp);
2657                 kprintf (SPP_FMT "up\n", SPP_ARGS(ifp));
2658         }
2659
2660         for (i = 0; i < IDX_COUNT; i++)
2661                 if ((cps[i])->flags & CP_QUAL)
2662                         (cps[i])->Open(sp);
2663
2664         if ((sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) != 0 ||
2665             (sp->pp_flags & PP_NEEDAUTH) != 0)
2666                 sp->pp_phase = PHASE_AUTHENTICATE;
2667         else
2668                 sp->pp_phase = PHASE_NETWORK;
2669
2670         if (debug)
2671                 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
2672                     sppp_phase_name(sp->pp_phase));
2673
2674         /*
2675          * Open all authentication protocols.  This is even required
2676          * if we already proceeded to network phase, since it might be
2677          * that remote wants us to authenticate, so we might have to
2678          * send a PAP request.  Undesired authentication protocols
2679          * don't do anything when they get an Open event.
2680          */
2681         for (i = 0; i < IDX_COUNT; i++)
2682                 if ((cps[i])->flags & CP_AUTH)
2683                         (cps[i])->Open(sp);
2684
2685         if (sp->pp_phase == PHASE_NETWORK) {
2686                 /* Notify all NCPs. */
2687                 for (i = 0; i < IDX_COUNT; i++)
2688                         if (((cps[i])->flags & CP_NCP) &&
2689                             /*
2690                              * XXX
2691                              * Hack to administratively disable IPv6 if
2692                              * not desired.  Perhaps we should have another
2693                              * flag for this, but right now, we can make
2694                              * all struct cp's read/only.
2695                              */
2696                             (cps[i] != &ipv6cp ||
2697                              (sp->confflags & CONF_ENABLE_IPV6)))
2698                                 (cps[i])->Open(sp);
2699         }
2700
2701         /* Send Up events to all started protos. */
2702         for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
2703                 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0)
2704                         (cps[i])->Up(sp);
2705
2706         /* notify low-level driver of state change */
2707         if (sp->pp_chg)
2708                 sp->pp_chg(sp, (int)sp->pp_phase);
2709         
2710         if (sp->pp_phase == PHASE_NETWORK)
2711                 /* if no NCP is starting, close down */
2712                 sppp_lcp_check_and_close(sp);
2713 }
2714
2715 static void
2716 sppp_lcp_tld(struct sppp *sp)
2717 {
2718         STDDCL;
2719         int i;
2720         u_long mask;
2721
2722         sp->pp_phase = PHASE_TERMINATE;
2723
2724         if (debug)
2725                 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
2726                     sppp_phase_name(sp->pp_phase));
2727
2728         /*
2729          * Take upper layers down.  We send the Down event first and
2730          * the Close second to prevent the upper layers from sending
2731          * ``a flurry of terminate-request packets'', as the RFC
2732          * describes it.
2733          */
2734         for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
2735                 if ((sp->lcp.protos & mask) && ((cps[i])->flags & CP_LCP) == 0) {
2736                         (cps[i])->Down(sp);
2737                         (cps[i])->Close(sp);
2738                 }
2739 }
2740
2741 static void
2742 sppp_lcp_tls(struct sppp *sp)
2743 {
2744         STDDCL;
2745
2746         sp->pp_phase = PHASE_ESTABLISH;
2747
2748         if (debug)
2749                 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
2750                     sppp_phase_name(sp->pp_phase));
2751
2752         /* Notify lower layer if desired. */
2753         if (sp->pp_tls)
2754                 (sp->pp_tls)(sp);
2755         else
2756                 (sp->pp_up)(sp);
2757 }
2758
2759 static void
2760 sppp_lcp_tlf(struct sppp *sp)
2761 {
2762         STDDCL;
2763
2764         sp->pp_phase = PHASE_DEAD;
2765         if (debug)
2766                 log(LOG_DEBUG, SPP_FMT "phase %s\n", SPP_ARGS(ifp),
2767                     sppp_phase_name(sp->pp_phase));
2768
2769         /* Notify lower layer if desired. */
2770         if (sp->pp_tlf)
2771                 (sp->pp_tlf)(sp);
2772         else
2773                 (sp->pp_down)(sp);
2774 }
2775
2776 static void
2777 sppp_lcp_scr(struct sppp *sp)
2778 {
2779         char opt[6 /* magicnum */ + 4 /* mru */ + 5 /* chap */];
2780         int i = 0;
2781         u_short authproto;
2782
2783         if (sp->lcp.opts & (1 << LCP_OPT_MAGIC)) {
2784                 if (! sp->lcp.magic)
2785 #if defined(__DragonFly__)
2786                         sp->lcp.magic = krandom();
2787 #else
2788                         sp->lcp.magic = time.tv_sec + time.tv_usec;
2789 #endif
2790                 opt[i++] = LCP_OPT_MAGIC;
2791                 opt[i++] = 6;
2792                 opt[i++] = sp->lcp.magic >> 24;
2793                 opt[i++] = sp->lcp.magic >> 16;
2794                 opt[i++] = sp->lcp.magic >> 8;
2795                 opt[i++] = sp->lcp.magic;
2796         }
2797
2798         if (sp->lcp.opts & (1 << LCP_OPT_MRU)) {
2799                 opt[i++] = LCP_OPT_MRU;
2800                 opt[i++] = 4;
2801                 opt[i++] = sp->lcp.mru >> 8;
2802                 opt[i++] = sp->lcp.mru;
2803         }
2804
2805         if (sp->lcp.opts & (1 << LCP_OPT_AUTH_PROTO)) {
2806                 authproto = sp->hisauth.proto;
2807                 opt[i++] = LCP_OPT_AUTH_PROTO;
2808                 opt[i++] = authproto == PPP_CHAP? 5: 4;
2809                 opt[i++] = authproto >> 8;
2810                 opt[i++] = authproto;
2811                 if (authproto == PPP_CHAP)
2812                         opt[i++] = CHAP_MD5;
2813         }
2814
2815         sp->confid[IDX_LCP] = ++sp->pp_seq[IDX_LCP];
2816         sppp_cp_send (sp, PPP_LCP, CONF_REQ, sp->confid[IDX_LCP], i, &opt);
2817 }
2818
2819 /*
2820  * Check the open NCPs, return true if at least one NCP is open.
2821  */
2822 static int
2823 sppp_ncp_check(struct sppp *sp)
2824 {
2825         int i, mask;
2826
2827         for (i = 0, mask = 1; i < IDX_COUNT; i++, mask <<= 1)
2828                 if ((sp->lcp.protos & mask) && (cps[i])->flags & CP_NCP)
2829                         return 1;
2830         return 0;
2831 }
2832
2833 /*
2834  * Re-check the open NCPs and see if we should terminate the link.
2835  * Called by the NCPs during their tlf action handling.
2836  */
2837 static void
2838 sppp_lcp_check_and_close(struct sppp *sp)
2839 {
2840
2841         if (sp->pp_phase < PHASE_NETWORK)
2842                 /* don't bother, we are already going down */
2843                 return;
2844
2845         if (sppp_ncp_check(sp))
2846                 return;
2847
2848         lcp.Close(sp);
2849 }
2850
2851 /*
2852  *--------------------------------------------------------------------------*
2853  *                                                                          *
2854  *                        The IPCP implementation.                          *
2855  *                                                                          *
2856  *--------------------------------------------------------------------------*
2857  */
2858
2859 static void
2860 sppp_ipcp_init(struct sppp *sp)
2861 {
2862         sp->ipcp.opts = 0;
2863         sp->ipcp.flags = 0;
2864         sp->state[IDX_IPCP] = STATE_INITIAL;
2865         sp->fail_counter[IDX_IPCP] = 0;
2866         sp->pp_seq[IDX_IPCP] = 0;
2867         sp->pp_rseq[IDX_IPCP] = 0;
2868 #if defined(__DragonFly__)
2869         callout_init(&sp->timeout[IDX_IPCP]);
2870 #endif
2871 }
2872
2873 static void
2874 sppp_ipcp_up(struct sppp *sp)
2875 {
2876         sppp_up_event(&ipcp, sp);
2877 }
2878
2879 static void
2880 sppp_ipcp_down(struct sppp *sp)
2881 {
2882         sppp_down_event(&ipcp, sp);
2883 }
2884
2885 static void
2886 sppp_ipcp_open(struct sppp *sp)
2887 {
2888         STDDCL;
2889         u_long myaddr, hisaddr;
2890
2891         sp->ipcp.flags &= ~(IPCP_HISADDR_SEEN | IPCP_MYADDR_SEEN |
2892                             IPCP_MYADDR_DYN | IPCP_VJ);
2893         sp->ipcp.opts = 0;
2894
2895         sppp_get_ip_addrs(sp, &myaddr, &hisaddr, 0);
2896         /*
2897          * If we don't have his address, this probably means our
2898          * interface doesn't want to talk IP at all.  (This could
2899          * be the case if somebody wants to speak only IPX, for
2900          * example.)  Don't open IPCP in this case.
2901          */
2902         if (hisaddr == 0L) {
2903                 /* XXX this message should go away */
2904                 if (debug)
2905                         log(LOG_DEBUG, SPP_FMT "ipcp_open(): no IP interface\n",
2906                             SPP_ARGS(ifp));
2907                 return;
2908         }
2909         if (myaddr == 0L) {
2910                 /*
2911                  * I don't have an assigned address, so i need to
2912                  * negotiate my address.
2913                  */
2914                 sp->ipcp.flags |= IPCP_MYADDR_DYN;
2915                 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS);
2916         } else
2917                 sp->ipcp.flags |= IPCP_MYADDR_SEEN;
2918         if (sp->confflags & CONF_ENABLE_VJ) {
2919                 sp->ipcp.opts |= (1 << IPCP_OPT_COMPRESSION);
2920                 sp->ipcp.max_state = MAX_STATES - 1;
2921                 sp->ipcp.compress_cid = 1;
2922         }
2923         sppp_open_event(&ipcp, sp);
2924 }
2925
2926 static void
2927 sppp_ipcp_close(struct sppp *sp)
2928 {
2929         sppp_close_event(&ipcp, sp);
2930         if (sp->ipcp.flags & IPCP_MYADDR_DYN)
2931                 /*
2932                  * My address was dynamic, clear it again.
2933                  */
2934                 sppp_set_ip_addr(sp, 0L);
2935 }
2936
2937 static void
2938 sppp_ipcp_TO(void *cookie)
2939 {
2940         sppp_to_event(&ipcp, (struct sppp *)cookie);
2941 }
2942
2943 /*
2944  * Analyze a configure request.  Return true if it was agreeable, and
2945  * caused action sca, false if it has been rejected or nak'ed, and
2946  * caused action scn.  (The return value is used to make the state
2947  * transition decision in the state automaton.)
2948  */
2949 static int
2950 sppp_ipcp_RCR(struct sppp *sp, struct lcp_header *h, int len)
2951 {
2952         u_char *buf, *r, *p;
2953         struct ifnet *ifp = &sp->pp_if;
2954         int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG;
2955         u_long hisaddr, desiredaddr;
2956         int gotmyaddr = 0;
2957         int desiredcomp;
2958
2959         len -= 4;
2960         origlen = len;
2961         /*
2962          * Make sure to allocate a buf that can at least hold a
2963          * conf-nak with an `address' option.  We might need it below.
2964          */
2965         buf = r = kmalloc ((len < 6? 6: len), M_TEMP, M_INTWAIT);
2966
2967         /* pass 1: see if we can recognize them */
2968         if (debug)
2969                 log(LOG_DEBUG, SPP_FMT "ipcp parse opts: ",
2970                     SPP_ARGS(ifp));
2971         p = (void*) (h+1);
2972         for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) {
2973                 /* Sanity check option length */
2974                 if (p[1] > len) {
2975                         /* XXX should we just RXJ? */
2976                         log(-1, "%s: malicious IPCP option received, dropping\n",
2977                             ifp->if_xname);
2978                         goto drop;
2979                 }
2980                 if (debug)
2981                         log(-1, " %s ", sppp_ipcp_opt_name(*p));
2982                 switch (*p) {
2983                 case IPCP_OPT_COMPRESSION:
2984                         if (!(sp->confflags & CONF_ENABLE_VJ)) {
2985                                 /* VJ compression administratively disabled */
2986                                 if (debug)
2987                                         log(-1, "[locally disabled] ");
2988                                 break;
2989                         }
2990                         /*
2991                          * In theory, we should only conf-rej an
2992                          * option that is shorter than RFC 1618
2993                          * requires (i.e. < 4), and should conf-nak
2994                          * anything else that is not VJ.  However,
2995                          * since our algorithm always uses the
2996                          * original option to NAK it with new values,
2997                          * things would become more complicated.  In
2998                          * pratice, the only commonly implemented IP
2999                          * compression option is VJ anyway, so the
3000                          * difference is negligible.
3001                          */
3002                         if (len >= 6 && p[1] == 6) {
3003                                 /*
3004                                  * correctly formed compression option
3005                                  * that could be VJ compression
3006                                  */
3007                                 continue;
3008                         }
3009                         if (debug)
3010                                 log(-1, "optlen %d [invalid/unsupported] ",
3011                                     p[1]);
3012                         break;
3013                 case IPCP_OPT_ADDRESS:
3014                         if (len >= 6 && p[1] == 6) {
3015                                 /* correctly formed address option */
3016                                 continue;
3017                         }
3018                         if (debug)
3019                                 log(-1, "[invalid] ");
3020                         break;
3021                 default:
3022                         /* Others not supported. */
3023                         if (debug)
3024                                 log(-1, "[rej] ");
3025                         break;
3026                 }
3027                 /* Add the option to rejected list. */
3028                 bcopy (p, r, p[1]);
3029                 r += p[1];
3030                 rlen += p[1];
3031         }
3032         if (rlen) {
3033                 if (debug)
3034                         log(-1, " send conf-rej\n");
3035                 sppp_cp_send (sp, PPP_IPCP, CONF_REJ, h->ident, rlen, buf);
3036                 return 0;
3037         } else if (debug)
3038                 log(-1, "\n");
3039
3040         /* pass 2: parse option values */
3041         sppp_get_ip_addrs(sp, 0, &hisaddr, 0);
3042         if (debug)
3043                 log(LOG_DEBUG, SPP_FMT "ipcp parse opt values: ",
3044                        SPP_ARGS(ifp));
3045         p = (void*) (h+1);
3046         len = origlen;
3047         for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) {
3048                 if (debug)
3049                         log(-1, " %s ", sppp_ipcp_opt_name(*p));
3050                 switch (*p) {
3051                 case IPCP_OPT_COMPRESSION:
3052                         desiredcomp = p[2] << 8 | p[3];
3053                         /* We only support VJ */
3054                         if (desiredcomp == IPCP_COMP_VJ) {
3055                                 if (debug)
3056                                         log(-1, "VJ [ack] ");
3057                                 sp->ipcp.flags |= IPCP_VJ;
3058                                 sl_compress_init(sp->pp_comp, p[4]);
3059                                 sp->ipcp.max_state = p[4];
3060                                 sp->ipcp.compress_cid = p[5];
3061                                 continue;
3062                         }
3063                         if (debug)
3064                                 log(-1, "compproto %#04x [not supported] ",
3065                                     desiredcomp);
3066                         p[2] = IPCP_COMP_VJ >> 8;
3067                         p[3] = IPCP_COMP_VJ;
3068                         p[4] = sp->ipcp.max_state;
3069                         p[5] = sp->ipcp.compress_cid;
3070                         break;
3071                 case IPCP_OPT_ADDRESS:
3072                         /* This is the address he wants in his end */
3073                         desiredaddr = p[2] << 24 | p[3] << 16 |
3074                                 p[4] << 8 | p[5];
3075                         if (desiredaddr == hisaddr ||
3076                             (hisaddr >= 1 && hisaddr <= 254 && desiredaddr != 0)) {
3077                                 /*
3078                                  * Peer's address is same as our value,
3079                                  * or we have set it to 0.0.0.* to
3080                                  * indicate that we do not really care,
3081                                  * this is agreeable.  Gonna conf-ack
3082                                  * it.
3083                                  */
3084                                 if (debug)
3085                                         log(-1, "%s [ack] ",
3086                                                 sppp_dotted_quad(hisaddr));
3087                                 /* record that we've seen it already */
3088                                 sp->ipcp.flags |= IPCP_HISADDR_SEEN;
3089                                 continue;
3090                         }
3091                         /*
3092                          * The address wasn't agreeable.  This is either
3093                          * he sent us 0.0.0.0, asking to assign him an
3094                          * address, or he send us another address not
3095                          * matching our value.  Either case, we gonna
3096                          * conf-nak it with our value.
3097                          * XXX: we should "rej" if hisaddr == 0
3098                          */
3099                         if (debug) {
3100                                 if (desiredaddr == 0)
3101                                         log(-1, "[addr requested] ");
3102                                 else
3103                                         log(-1, "%s [not agreed] ",
3104                                                 sppp_dotted_quad(desiredaddr));
3105
3106                         }
3107                         p[2] = hisaddr >> 24;
3108                         p[3] = hisaddr >> 16;
3109                         p[4] = hisaddr >> 8;
3110                         p[5] = hisaddr;
3111                         break;
3112                 }
3113                 /* Add the option to nak'ed list. */
3114                 bcopy (p, r, p[1]);
3115                 r += p[1];
3116                 rlen += p[1];
3117         }
3118
3119         /*
3120          * If we are about to conf-ack the request, but haven't seen
3121          * his address so far, gonna conf-nak it instead, with the
3122          * `address' option present and our idea of his address being
3123          * filled in there, to request negotiation of both addresses.
3124          *
3125          * XXX This can result in an endless req - nak loop if peer
3126          * doesn't want to send us his address.  Q: What should we do
3127          * about it?  XXX  A: implement the max-failure counter.
3128          */
3129         if (rlen == 0 && !(sp->ipcp.flags & IPCP_HISADDR_SEEN) && !gotmyaddr) {
3130                 buf[0] = IPCP_OPT_ADDRESS;
3131                 buf[1] = 6;
3132                 buf[2] = hisaddr >> 24;
3133                 buf[3] = hisaddr >> 16;
3134                 buf[4] = hisaddr >> 8;
3135                 buf[5] = hisaddr;
3136                 rlen = 6;
3137                 if (debug)
3138                         log(-1, "still need hisaddr ");
3139         }
3140
3141         if (rlen) {
3142                 if (debug)
3143                         log(-1, " send conf-nak\n");
3144                 sppp_cp_send (sp, PPP_IPCP, CONF_NAK, h->ident, rlen, buf);
3145         } else {
3146                 if (debug)
3147                         log(-1, " send conf-ack\n");
3148                 sppp_cp_send (sp, PPP_IPCP, CONF_ACK,
3149                               h->ident, origlen, h+1);
3150         }
3151
3152         kfree (buf, M_TEMP);
3153         return (rlen == 0);
3154
3155 drop:
3156         kfree(buf, M_TEMP);
3157         return (-1);
3158 }
3159
3160 /*
3161  * Analyze the IPCP Configure-Reject option list, and adjust our
3162  * negotiation.
3163  */
3164 static void
3165 sppp_ipcp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
3166 {
3167         u_char *buf, *p;
3168         struct ifnet *ifp = &sp->pp_if;
3169         int debug = ifp->if_flags & IFF_DEBUG;
3170
3171         len -= 4;
3172         buf = kmalloc (len, M_TEMP, M_INTWAIT);
3173
3174         if (debug)
3175                 log(LOG_DEBUG, SPP_FMT "ipcp rej opts: ",
3176                     SPP_ARGS(ifp));
3177
3178         p = (void*) (h+1);
3179         for (; len > 1 && p[1]; len -= p[1], p += p[1]) {
3180                 /* Sanity check option length */
3181                 if (p[1] > len) {
3182                         /* XXX should we just RXJ? */
3183                         log(-1, "%s: malicious IPCP option received, dropping\n",
3184                             ifp->if_xname);
3185                         goto drop;
3186                 }
3187                 if (debug)
3188                         log(-1, " %s ", sppp_ipcp_opt_name(*p));
3189                 switch (*p) {
3190                 case IPCP_OPT_COMPRESSION:
3191                         sp->ipcp.opts &= ~(1 << IPCP_OPT_COMPRESSION);
3192                         break;
3193                 case IPCP_OPT_ADDRESS:
3194                         /*
3195                          * Peer doesn't grok address option.  This is
3196                          * bad.  XXX  Should we better give up here?
3197                          * XXX We could try old "addresses" option...
3198                          */
3199                         sp->ipcp.opts &= ~(1 << IPCP_OPT_ADDRESS);
3200                         break;
3201                 }
3202         }
3203         if (debug)
3204                 log(-1, "\n");
3205 drop:
3206         kfree (buf, M_TEMP);
3207         return;
3208 }
3209
3210 /*
3211  * Analyze the IPCP Configure-NAK option list, and adjust our
3212  * negotiation.
3213  */
3214 static void
3215 sppp_ipcp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
3216 {
3217         u_char *buf, *p;
3218         struct ifnet *ifp = &sp->pp_if;
3219         int debug = ifp->if_flags & IFF_DEBUG;
3220         int desiredcomp;
3221         u_long wantaddr;
3222
3223         len -= 4;
3224         buf = kmalloc (len, M_TEMP, M_INTWAIT);
3225
3226         if (debug)
3227                 log(LOG_DEBUG, SPP_FMT "ipcp nak opts: ",
3228                     SPP_ARGS(ifp));
3229
3230         p = (void*) (h+1);
3231         for (; len > 1 && p[1]; len -= p[1], p += p[1]) {
3232                 /* Sanity check option length */
3233                 if (p[1] > len) {
3234                         /* XXX should we just RXJ? */
3235                         log(-1, "%s: malicious IPCP option received, dropping\n",
3236                             ifp->if_xname);
3237                         return;
3238                 }
3239                 if (debug)
3240                         log(-1, " %s ", sppp_ipcp_opt_name(*p));
3241                 switch (*p) {
3242                 case IPCP_OPT_COMPRESSION:
3243                         if (len >= 6 && p[1] == 6) {
3244                                 desiredcomp = p[2] << 8 | p[3];
3245                                 if (debug)
3246                                         log(-1, "[wantcomp %#04x] ",
3247                                                 desiredcomp);
3248                                 if (desiredcomp == IPCP_COMP_VJ) {
3249                                         sl_compress_init(sp->pp_comp, p[4]);
3250                                         sp->ipcp.max_state = p[4];
3251                                         sp->ipcp.compress_cid = p[5];
3252                                         if (debug)
3253                                                 log(-1, "[agree] ");
3254                                 } else
3255                                         sp->ipcp.opts &=
3256                                                 ~(1 << IPCP_OPT_COMPRESSION);
3257                         }
3258                         break;
3259                 case IPCP_OPT_ADDRESS:
3260                         /*
3261                          * Peer doesn't like our local IP address.  See
3262                          * if we can do something for him.  We'll drop
3263                          * him our address then.
3264                          */
3265                         if (len >= 6 && p[1] == 6) {
3266                                 wantaddr = p[2] << 24 | p[3] << 16 |
3267                                         p[4] << 8 | p[5];
3268                                 sp->ipcp.opts |= (1 << IPCP_OPT_ADDRESS);
3269                                 if (debug)
3270                                         log(-1, "[wantaddr %s] ",
3271                                                sppp_dotted_quad(wantaddr));
3272                                 /*
3273                                  * When doing dynamic address assignment,
3274                                  * we accept his offer.  Otherwise, we
3275                                  * ignore it and thus continue to negotiate
3276                                  * our already existing value.
3277                                  * XXX: Bogus, if he said no once, he'll
3278                                  * just say no again, might as well die.
3279                                  */
3280                                 if (sp->ipcp.flags & IPCP_MYADDR_DYN) {
3281                                         sppp_set_ip_addr(sp, wantaddr);
3282                                         if (debug)
3283                                                 log(-1, "[agree] ");
3284                                         sp->ipcp.flags |= IPCP_MYADDR_SEEN;
3285                                 }
3286                         }
3287                         break;
3288                 }
3289         }
3290         if (debug)
3291                 log(-1, "\n");
3292         kfree (buf, M_TEMP);
3293         return;
3294 }
3295
3296 static void
3297 sppp_ipcp_tlu(struct sppp *sp)
3298 {
3299         /* we are up - notify isdn daemon */
3300         if (sp->pp_con)
3301                 sp->pp_con(sp);
3302 }
3303
3304 static void
3305 sppp_ipcp_tld(struct sppp *sp)
3306 {
3307 }
3308
3309 static void
3310 sppp_ipcp_tls(struct sppp *sp)
3311 {
3312         /* indicate to LCP that it must stay alive */
3313         sp->lcp.protos |= (1 << IDX_IPCP);
3314 }
3315
3316 static void
3317 sppp_ipcp_tlf(struct sppp *sp)
3318 {
3319         /* we no longer need LCP */
3320         sp->lcp.protos &= ~(1 << IDX_IPCP);
3321         sppp_lcp_check_and_close(sp);
3322 }
3323
3324 static void
3325 sppp_ipcp_scr(struct sppp *sp)
3326 {
3327         char opt[6 /* compression */ + 6 /* address */];
3328         u_long ouraddr;
3329         int i = 0;
3330
3331         if (sp->ipcp.opts & (1 << IPCP_OPT_COMPRESSION)) {
3332                 opt[i++] = IPCP_OPT_COMPRESSION;
3333                 opt[i++] = 6;
3334                 opt[i++] = IPCP_COMP_VJ >> 8;
3335                 opt[i++] = IPCP_COMP_VJ;
3336                 opt[i++] = sp->ipcp.max_state;
3337                 opt[i++] = sp->ipcp.compress_cid;
3338         }
3339         if (sp->ipcp.opts & (1 << IPCP_OPT_ADDRESS)) {
3340                 sppp_get_ip_addrs(sp, &ouraddr, 0, 0);
3341                 opt[i++] = IPCP_OPT_ADDRESS;
3342                 opt[i++] = 6;
3343                 opt[i++] = ouraddr >> 24;
3344                 opt[i++] = ouraddr >> 16;
3345                 opt[i++] = ouraddr >> 8;
3346                 opt[i++] = ouraddr;
3347         }
3348
3349         sp->confid[IDX_IPCP] = ++sp->pp_seq[IDX_IPCP];
3350         sppp_cp_send(sp, PPP_IPCP, CONF_REQ, sp->confid[IDX_IPCP], i, &opt);
3351 }
3352
3353 /*
3354  *--------------------------------------------------------------------------*
3355  *                                                                          *
3356  *                      The IPv6CP implementation.                          *
3357  *                                                                          *
3358  *--------------------------------------------------------------------------*
3359  */
3360
3361 #ifdef INET6
3362 static void
3363 sppp_ipv6cp_init(struct sppp *sp)
3364 {
3365         sp->ipv6cp.opts = 0;
3366         sp->ipv6cp.flags = 0;
3367         sp->state[IDX_IPV6CP] = STATE_INITIAL;
3368         sp->fail_counter[IDX_IPV6CP] = 0;
3369         sp->pp_seq[IDX_IPV6CP] = 0;
3370         sp->pp_rseq[IDX_IPV6CP] = 0;
3371 #if defined(__NetBSD__)
3372         callout_init(&sp->ch[IDX_IPV6CP]);
3373 #endif
3374 #if defined(__DragonFly__)
3375         callout_init(&sp->timeout[IDX_IPV6CP]);
3376 #endif
3377 }
3378
3379 static void
3380 sppp_ipv6cp_up(struct sppp *sp)
3381 {
3382         sppp_up_event(&ipv6cp, sp);
3383 }
3384
3385 static void
3386 sppp_ipv6cp_down(struct sppp *sp)
3387 {
3388         sppp_down_event(&ipv6cp, sp);
3389 }
3390
3391 static void
3392 sppp_ipv6cp_open(struct sppp *sp)
3393 {
3394         STDDCL;
3395         struct in6_addr myaddr, hisaddr;
3396
3397 #ifdef IPV6CP_MYIFID_DYN
3398         sp->ipv6cp.flags &= ~(IPV6CP_MYIFID_SEEN|IPV6CP_MYIFID_DYN);
3399 #else
3400         sp->ipv6cp.flags &= ~IPV6CP_MYIFID_SEEN;
3401 #endif
3402
3403         sppp_get_ip6_addrs(sp, &myaddr, &hisaddr, 0);
3404         /*
3405          * If we don't have our address, this probably means our
3406          * interface doesn't want to talk IPv6 at all.  (This could
3407          * be the case if somebody wants to speak only IPX, for
3408          * example.)  Don't open IPv6CP in this case.
3409          */
3410         if (IN6_IS_ADDR_UNSPECIFIED(&myaddr)) {
3411                 /* XXX this message should go away */
3412                 if (debug)
3413                         log(LOG_DEBUG, SPP_FMT "ipv6cp_open(): no IPv6 interface\n",
3414                             SPP_ARGS(ifp));
3415                 return;
3416         }
3417
3418         sp->ipv6cp.flags |= IPV6CP_MYIFID_SEEN;
3419         sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID);
3420         sppp_open_event(&ipv6cp, sp);
3421 }
3422
3423 static void
3424 sppp_ipv6cp_close(struct sppp *sp)
3425 {
3426         sppp_close_event(&ipv6cp, sp);
3427 }
3428
3429 static void
3430 sppp_ipv6cp_TO(void *cookie)
3431 {
3432         sppp_to_event(&ipv6cp, (struct sppp *)cookie);
3433 }
3434
3435 /*
3436  * Analyze a configure request.  Return true if it was agreeable, and
3437  * caused action sca, false if it has been rejected or nak'ed, and
3438  * caused action scn.  (The return value is used to make the state
3439  * transition decision in the state automaton.)
3440  */
3441 static int
3442 sppp_ipv6cp_RCR(struct sppp *sp, struct lcp_header *h, int len)
3443 {
3444         u_char *buf, *r, *p;
3445         struct ifnet *ifp = &sp->pp_if;
3446         int rlen, origlen, debug = ifp->if_flags & IFF_DEBUG;
3447         struct in6_addr myaddr, desiredaddr, suggestaddr;
3448         int ifidcount;
3449         int type;
3450         int collision, nohisaddr;
3451
3452         len -= 4;
3453         origlen = len;
3454         /*
3455          * Make sure to allocate a buf that can at least hold a
3456          * conf-nak with an `address' option.  We might need it below.
3457          */
3458         buf = r = kmalloc ((len < 6? 6: len), M_TEMP, M_INTWAIT);
3459
3460         /* pass 1: see if we can recognize them */
3461         if (debug)
3462                 log(LOG_DEBUG, SPP_FMT "ipv6cp parse opts:",
3463                     SPP_ARGS(ifp));
3464         p = (void*) (h+1);
3465         ifidcount = 0;
3466         for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) {
3467                 /* Sanity check option length */
3468                 if (p[1] > len) {
3469                         /* XXX just RXJ? */
3470                         log(-1, "%s: received malicious IPCPv6 option, "
3471                             "dropping\n", ifp->if_xname);
3472                         goto drop;
3473                 }
3474                 if (debug)
3475                         log(-1, " %s", sppp_ipv6cp_opt_name(*p));
3476                 switch (*p) {
3477                 case IPV6CP_OPT_IFID:
3478                         if (len >= 10 && p[1] == 10 && ifidcount == 0) {
3479                                 /* correctly formed address option */
3480                                 ifidcount++;
3481                                 continue;
3482                         }
3483                         if (debug)
3484                                 log(-1, " [invalid]");
3485                         break;
3486 #ifdef notyet
3487                 case IPV6CP_OPT_COMPRESSION:
3488                         if (len >= 4 && p[1] >= 4) {
3489                                 /* correctly formed compress option */
3490                                 continue;
3491                         }
3492                         if (debug)
3493                                 log(-1, " [invalid]");
3494                         break;
3495 #endif
3496                 default:
3497                         /* Others not supported. */
3498                         if (debug)
3499                                 log(-1, " [rej]");
3500                         break;
3501                 }
3502                 /* Add the option to rejected list. */
3503                 bcopy (p, r, p[1]);
3504                 r += p[1];
3505                 rlen += p[1];
3506         }
3507         if (rlen) {
3508                 if (debug)
3509                         log(-1, " send conf-rej\n");
3510                 sppp_cp_send (sp, PPP_IPV6CP, CONF_REJ, h->ident, rlen, buf);
3511                 goto end;
3512         } else if (debug)
3513                 log(-1, "\n");
3514
3515         /* pass 2: parse option values */
3516         sppp_get_ip6_addrs(sp, &myaddr, 0, 0);
3517         if (debug)
3518                 log(LOG_DEBUG, SPP_FMT "ipv6cp parse opt values: ",
3519                     SPP_ARGS(ifp));
3520         p = (void*) (h+1);
3521         len = origlen;
3522         type = CONF_ACK;
3523         for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) {
3524                 if (debug)
3525                         log(-1, " %s", sppp_ipv6cp_opt_name(*p));
3526                 switch (*p) {
3527 #ifdef notyet
3528                 case IPV6CP_OPT_COMPRESSION:
3529                         continue;
3530 #endif
3531                 case IPV6CP_OPT_IFID:
3532                         bzero(&desiredaddr, sizeof(desiredaddr));
3533                         bcopy(&p[2], &desiredaddr.s6_addr[8], 8);
3534                         collision = (bcmp(&desiredaddr.s6_addr[8],
3535                                           &myaddr.s6_addr[8], 8) == 0);
3536                         nohisaddr = IN6_IS_ADDR_UNSPECIFIED(&desiredaddr);
3537
3538                         desiredaddr.s6_addr16[0] = htons(0xfe80);
3539                         desiredaddr.s6_addr16[1] = htons(sp->pp_if.if_index);
3540
3541                         if (!collision && !nohisaddr) {
3542                                 /* no collision, hisaddr known - Conf-Ack */
3543                                 type = CONF_ACK;
3544
3545                                 if (debug) {
3546                                         log(-1, " %s [%s]",
3547                                                ip6_sprintf(&desiredaddr),
3548                                                sppp_cp_type_name(type));
3549                                 }
3550                                 continue;
3551                         }
3552
3553                         bzero(&suggestaddr, sizeof(&suggestaddr));
3554                         if (collision && nohisaddr) {
3555                                 /* collision, hisaddr unknown - Conf-Rej */
3556                                 type = CONF_REJ;
3557                                 bzero(&p[2], 8);
3558                         } else {
3559                                 /*
3560                                  * - no collision, hisaddr unknown, or
3561                                  * - collision, hisaddr known
3562                                  * Conf-Nak, suggest hisaddr
3563                                  */
3564                                 type = CONF_NAK;
3565                                 sppp_suggest_ip6_addr(sp, &suggestaddr);
3566                                 bcopy(&suggestaddr.s6_addr[8], &p[2], 8);
3567                         }
3568                         if (debug)
3569                                 log(-1, " %s [%s]", ip6_sprintf(&desiredaddr),
3570                                        sppp_cp_type_name(type));
3571                         break;
3572                 }
3573                 /* Add the option to nak'ed list. */
3574                 bcopy (p, r, p[1]);
3575                 r += p[1];
3576                 rlen += p[1];
3577         }
3578
3579         if (rlen == 0 && type == CONF_ACK) {
3580                 if (debug)
3581                         log(-1, " send %s\n", sppp_cp_type_name(type));
3582                 sppp_cp_send (sp, PPP_IPV6CP, type, h->ident, origlen, h+1);
3583         } else {
3584 #ifdef DIAGNOSTIC
3585                 if (type == CONF_ACK)
3586                         panic("IPv6CP RCR: CONF_ACK with non-zero rlen");
3587 #endif
3588
3589                 if (debug) {
3590                         log(-1, " send %s suggest %s\n",
3591                                sppp_cp_type_name(type), ip6_sprintf(&suggestaddr));
3592                 }
3593                 sppp_cp_send (sp, PPP_IPV6CP, type, h->ident, rlen, buf);
3594         }
3595
3596  end:
3597         kfree (buf, M_TEMP);
3598         return (rlen == 0);
3599
3600 drop:
3601         kfree(buf, M_TEMP);
3602         return (-1);
3603 }
3604
3605 /*
3606  * Analyze the IPv6CP Configure-Reject option list, and adjust our
3607  * negotiation.
3608  */
3609 static void
3610 sppp_ipv6cp_RCN_rej(struct sppp *sp, struct lcp_header *h, int len)
3611 {
3612         u_char *buf, *p;
3613         struct ifnet *ifp = &sp->pp_if;
3614         int debug = ifp->if_flags & IFF_DEBUG;
3615
3616         len -= 4;
3617         buf = kmalloc (len, M_TEMP, M_INTWAIT);
3618
3619         if (debug)
3620                 log(LOG_DEBUG, SPP_FMT "ipv6cp rej opts:",
3621                     SPP_ARGS(ifp));
3622
3623         p = (void*) (h+1);
3624         for (; len > 1 && p[1]; len -= p[1], p += p[1]) {
3625                 if (p[1] > len) {
3626                         /* XXX just RXJ? */
3627                         log(-1, "%s: received malicious IPCPv6 option, "
3628                             "dropping\n", ifp->if_xname);
3629                         goto drop;
3630                 }
3631                 if (debug)
3632                         log(-1, " %s", sppp_ipv6cp_opt_name(*p));
3633                 switch (*p) {
3634                 case IPV6CP_OPT_IFID:
3635                         /*
3636                          * Peer doesn't grok address option.  This is
3637                          * bad.  XXX  Should we better give up here?
3638                          */
3639                         sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_IFID);
3640                         break;
3641 #ifdef notyet
3642                 case IPV6CP_OPT_COMPRESS:
3643                         sp->ipv6cp.opts &= ~(1 << IPV6CP_OPT_COMPRESS);
3644                         break;
3645 #endif
3646                 }
3647         }
3648         if (debug)
3649                 log(-1, "\n");
3650 drop:
3651         kfree (buf, M_TEMP);
3652         return;
3653 }
3654
3655 /*
3656  * Analyze the IPv6CP Configure-NAK option list, and adjust our
3657  * negotiation.
3658  */
3659 static void
3660 sppp_ipv6cp_RCN_nak(struct sppp *sp, struct lcp_header *h, int len)
3661 {
3662         u_char *buf, *p;
3663         struct ifnet *ifp = &sp->pp_if;
3664         int debug = ifp->if_flags & IFF_DEBUG;
3665         struct in6_addr suggestaddr;
3666
3667         len -= 4;
3668         buf = kmalloc (len, M_TEMP, M_INTWAIT);
3669
3670         if (debug)
3671                 log(LOG_DEBUG, SPP_FMT "ipv6cp nak opts:",
3672                     SPP_ARGS(ifp));
3673
3674         p = (void*) (h+1);
3675         for (; len > 1 && p[1]; len -= p[1], p += p[1]) {
3676                 if (p[1] > len) {
3677                         /* XXX just RXJ? */
3678                         log(-1, "%s: received malicious IPCPv6 option, "
3679                             "dropping\n", ifp->if_xname);
3680                         goto drop;
3681                 }
3682                 if (debug)
3683                         log(-1, " %s", sppp_ipv6cp_opt_name(*p));
3684                 switch (*p) {
3685                 case IPV6CP_OPT_IFID:
3686                         /*
3687                          * Peer doesn't like our local ifid.  See
3688                          * if we can do something for him.  We'll drop
3689                          * him our address then.
3690                          */
3691                         if (len < 10 || p[1] != 10)
3692                                 break;
3693                         bzero(&suggestaddr, sizeof(suggestaddr));
3694                         suggestaddr.s6_addr16[0] = htons(0xfe80);
3695                         suggestaddr.s6_addr16[1] = htons(sp->pp_if.if_index);
3696                         bcopy(&p[2], &suggestaddr.s6_addr[8], 8);
3697
3698                         sp->ipv6cp.opts |= (1 << IPV6CP_OPT_IFID);
3699                         if (debug)
3700                                 log(-1, " [suggestaddr %s]",
3701                                        ip6_sprintf(&suggestaddr));
3702 #ifdef IPV6CP_MYIFID_DYN
3703                         /*
3704                          * When doing dynamic address assignment,
3705                          * we accept his offer.
3706                          */
3707                         if (sp->ipv6cp.flags & IPV6CP_MYIFID_DYN) {
3708                                 struct in6_addr lastsuggest;
3709                                 /*
3710                                  * If <suggested myaddr from peer> equals to
3711                                  * <hisaddr we have suggested last time>,
3712