1 /*
2 * ng_pppoe.c
3 */
4
5 /*-
6 * Copyright (c) 1996-1999 Whistle Communications, Inc.
7 * All rights reserved.
8 *
9 * Subject to the following obligations and disclaimer of warranty, use and
10 * redistribution of this software, in source or object code forms, with or
11 * without modifications are expressly permitted by Whistle Communications;
12 * provided, however, that:
13 * 1. Any and all reproductions of the source or object code must include the
14 * copyright notice above and the following disclaimer of warranties; and
15 * 2. No rights are granted, in any manner or form, to use Whistle
16 * Communications, Inc. trademarks, including the mark "WHISTLE
17 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as
18 * such appears in the above copyright notice or in the software.
19 *
20 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
21 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
22 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
23 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
24 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
25 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
26 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
27 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
28 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
29 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
30 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
31 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
32 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
35 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
36 * OF SUCH DAMAGE.
37 *
38 * Author: Julian Elischer <julian@freebsd.org>
39 *
40 * $FreeBSD$
41 * $Whistle: ng_pppoe.c,v 1.10 1999/11/01 09:24:52 julian Exp $
42 */
43
44 #include <sys/param.h>
45 #include <sys/systm.h>
46 #include <sys/kernel.h>
47 #include <sys/ktr.h>
48 #include <sys/mbuf.h>
49 #include <sys/malloc.h>
50 #include <sys/errno.h>
51 #include <sys/syslog.h>
52 #include <net/ethernet.h>
53
54 #include <netgraph/ng_message.h>
55 #include <netgraph/netgraph.h>
56 #include <netgraph/ng_parse.h>
57 #include <netgraph/ng_pppoe.h>
58 #include <netgraph/ng_ether.h>
59
60 #ifdef NG_SEPARATE_MALLOC
61 static MALLOC_DEFINE(M_NETGRAPH_PPPOE, "netgraph_pppoe", "netgraph pppoe node");
62 #else
63 #define M_NETGRAPH_PPPOE M_NETGRAPH
64 #endif
65
66 #define SIGNOFF "session closed"
67
68 /*
69 * This section contains the netgraph method declarations for the
70 * pppoe node. These methods define the netgraph pppoe 'type'.
71 */
72
73 static ng_constructor_t ng_pppoe_constructor;
74 static ng_rcvmsg_t ng_pppoe_rcvmsg;
75 static ng_shutdown_t ng_pppoe_shutdown;
76 static ng_newhook_t ng_pppoe_newhook;
77 static ng_connect_t ng_pppoe_connect;
78 static ng_rcvdata_t ng_pppoe_rcvdata;
79 static ng_rcvdata_t ng_pppoe_rcvdata_ether;
80 static ng_rcvdata_t ng_pppoe_rcvdata_debug;
81 static ng_disconnect_t ng_pppoe_disconnect;
82
83 /* Parse type for struct ngpppoe_init_data */
84 static const struct ng_parse_struct_field ngpppoe_init_data_type_fields[]
85 = NG_PPPOE_INIT_DATA_TYPE_INFO;
86 static const struct ng_parse_type ngpppoe_init_data_state_type = {
87 &ng_parse_struct_type,
88 &ngpppoe_init_data_type_fields
89 };
90
91 /* Parse type for struct ngpppoe_sts */
92 static const struct ng_parse_struct_field ng_pppoe_sts_type_fields[]
93 = NG_PPPOE_STS_TYPE_INFO;
94 static const struct ng_parse_type ng_pppoe_sts_state_type = {
95 &ng_parse_struct_type,
96 &ng_pppoe_sts_type_fields
97 };
98
99 /* List of commands and how to convert arguments to/from ASCII */
100 static const struct ng_cmdlist ng_pppoe_cmds[] = {
101 {
102 NGM_PPPOE_COOKIE,
103 NGM_PPPOE_CONNECT,
104 "pppoe_connect",
105 &ngpppoe_init_data_state_type,
106 NULL
107 },
108 {
109 NGM_PPPOE_COOKIE,
110 NGM_PPPOE_LISTEN,
111 "pppoe_listen",
112 &ngpppoe_init_data_state_type,
113 NULL
114 },
115 {
116 NGM_PPPOE_COOKIE,
117 NGM_PPPOE_OFFER,
118 "pppoe_offer",
119 &ngpppoe_init_data_state_type,
120 NULL
121 },
122 {
123 NGM_PPPOE_COOKIE,
124 NGM_PPPOE_SERVICE,
125 "pppoe_service",
126 &ngpppoe_init_data_state_type,
127 NULL
128 },
129 {
130 NGM_PPPOE_COOKIE,
131 NGM_PPPOE_SUCCESS,
132 "pppoe_success",
133 &ng_pppoe_sts_state_type,
134 NULL
135 },
136 {
137 NGM_PPPOE_COOKIE,
138 NGM_PPPOE_FAIL,
139 "pppoe_fail",
140 &ng_pppoe_sts_state_type,
141 NULL
142 },
143 {
144 NGM_PPPOE_COOKIE,
145 NGM_PPPOE_CLOSE,
146 "pppoe_close",
147 &ng_pppoe_sts_state_type,
148 NULL
149 },
150 {
151 NGM_PPPOE_COOKIE,
152 NGM_PPPOE_SETMODE,
153 "pppoe_setmode",
154 &ng_parse_string_type,
155 NULL
156 },
157 {
158 NGM_PPPOE_COOKIE,
159 NGM_PPPOE_GETMODE,
160 "pppoe_getmode",
161 NULL,
162 &ng_parse_string_type
163 },
164 {
165 NGM_PPPOE_COOKIE,
166 NGM_PPPOE_SETENADDR,
167 "setenaddr",
168 &ng_parse_enaddr_type,
169 NULL
170 },
171 {
172 NGM_PPPOE_COOKIE,
173 NGM_PPPOE_SETMAXP,
174 "setmaxp",
175 &ng_parse_uint16_type,
176 NULL
177 },
178 {
179 NGM_PPPOE_COOKIE,
180 NGM_PPPOE_SEND_HURL,
181 "send_hurl",
182 &ngpppoe_init_data_state_type,
183 NULL
184 },
185 {
186 NGM_PPPOE_COOKIE,
187 NGM_PPPOE_SEND_MOTM,
188 "send_motm",
189 &ngpppoe_init_data_state_type,
190 NULL
191 },
192 { 0 }
193 };
194
195 /* Netgraph node type descriptor */
196 static struct ng_type typestruct = {
197 .version = NG_ABI_VERSION,
198 .name = NG_PPPOE_NODE_TYPE,
199 .constructor = ng_pppoe_constructor,
200 .rcvmsg = ng_pppoe_rcvmsg,
201 .shutdown = ng_pppoe_shutdown,
202 .newhook = ng_pppoe_newhook,
203 .connect = ng_pppoe_connect,
204 .rcvdata = ng_pppoe_rcvdata,
205 .disconnect = ng_pppoe_disconnect,
206 .cmdlist = ng_pppoe_cmds,
207 };
208 NETGRAPH_INIT(pppoe, &typestruct);
209
210 /*
211 * States for the session state machine.
212 * These have no meaning if there is no hook attached yet.
213 */
214 enum state {
215 PPPOE_SNONE=0, /* [both] Initial state */
216 PPPOE_LISTENING, /* [Daemon] Listening for discover initiation pkt */
217 PPPOE_SINIT, /* [Client] Sent discovery initiation */
218 PPPOE_PRIMED, /* [Server] Awaiting PADI from daemon */
219 PPPOE_SOFFER, /* [Server] Sent offer message (got PADI)*/
220 PPPOE_SREQ, /* [Client] Sent a Request */
221 PPPOE_NEWCONNECTED, /* [Server] Connection established, No data received */
222 PPPOE_CONNECTED, /* [Both] Connection established, Data received */
223 PPPOE_DEAD /* [Both] */
224 };
225
226 #define NUMTAGS 20 /* number of tags we are set up to work with */
227
228 /*
229 * Information we store for each hook on each node for negotiating the
230 * session. The mbuf and cluster are freed once negotiation has completed.
231 * The whole negotiation block is then discarded.
232 */
233
234 struct sess_neg {
235 struct mbuf *m; /* holds cluster with last sent packet */
236 union packet *pkt; /* points within the above cluster */
237 struct callout handle; /* see timeout(9) */
238 u_int timeout; /* 0,1,2,4,8,16 etc. seconds */
239 u_int numtags;
240 const struct pppoe_tag *tags[NUMTAGS];
241 u_int service_len;
242 u_int ac_name_len;
243 u_int host_uniq_len;
244
245 struct datatag service;
246 struct datatag ac_name;
247 struct datatag host_uniq;
248 };
249 typedef struct sess_neg *negp;
250
251 /*
252 * Session information that is needed after connection.
253 */
254 struct sess_con {
255 hook_p hook;
256 uint16_t Session_ID;
257 enum state state;
258 ng_ID_t creator; /* who to notify */
259 struct pppoe_full_hdr pkt_hdr; /* used when connected */
260 negp neg; /* used when negotiating */
261 LIST_ENTRY(sess_con) sessions;
262 };
263 typedef struct sess_con *sessp;
264
265 #define SESSHASHSIZE 0x0100
266 #define SESSHASH(x) (((x) ^ ((x) >> 8)) & (SESSHASHSIZE - 1))
267
268 struct sess_hash_entry {
269 struct mtx mtx;
270 LIST_HEAD(hhead, sess_con) head;
271 };
272
273 /*
274 * Information we store for each node
275 */
276 struct PPPoE {
277 node_p node; /* back pointer to node */
278 hook_p ethernet_hook;
279 hook_p debug_hook;
280 u_int packets_in; /* packets in from ethernet */
281 u_int packets_out; /* packets out towards ethernet */
282 uint32_t flags;
283 #define COMPAT_3COM 0x00000001
284 #define COMPAT_DLINK 0x00000002
285 struct ether_header eh;
286 LIST_HEAD(, sess_con) listeners;
287 struct sess_hash_entry sesshash[SESSHASHSIZE];
288 struct maxptag max_payload; /* PPP-Max-Payload (RFC4638) */
289 };
290 typedef struct PPPoE *priv_p;
291
292 union uniq {
293 char bytes[sizeof(void *)];
294 void *pointer;
295 };
296
297 #define LEAVE(x) do { error = x; goto quit; } while(0)
298 static void pppoe_start(sessp sp);
299 static void pppoe_ticker(node_p node, hook_p hook, void *arg1, int arg2);
300 static const struct pppoe_tag *scan_tags(sessp sp,
301 const struct pppoe_hdr* ph);
302 static int pppoe_send_event(sessp sp, enum cmd cmdid);
303
304 /*************************************************************************
305 * Some basic utilities from the Linux version with author's permission.*
306 * Author: Michal Ostrowski <mostrows@styx.uwaterloo.ca> *
307 ************************************************************************/
308
309
310
311 /*
312 * Return the location where the next tag can be put
313 */
314 static __inline const struct pppoe_tag*
315 next_tag(const struct pppoe_hdr* ph)
316 {
317 return (const struct pppoe_tag*)(((const char*)(ph + 1))
318 + ntohs(ph->length));
319 }
320
321 /*
322 * Look for a tag of a specific type.
323 * Don't trust any length the other end says,
324 * but assume we already sanity checked ph->length.
325 */
326 static const struct pppoe_tag*
327 get_tag(const struct pppoe_hdr* ph, uint16_t idx)
328 {
329 const char *const end = (const char *)next_tag(ph);
330 const struct pppoe_tag *pt = (const void *)(ph + 1);
331 const char *ptn;
332
333 /*
334 * Keep processing tags while a tag header will still fit.
335 */
336 while((const char*)(pt + 1) <= end) {
337 /*
338 * If the tag data would go past the end of the packet, abort.
339 */
340 ptn = (((const char *)(pt + 1)) + ntohs(pt->tag_len));
341 if (ptn > end) {
342 CTR2(KTR_NET, "%20s: invalid length for tag %d",
343 __func__, idx);
344 return (NULL);
345 }
346 if (pt->tag_type == idx) {
347 CTR2(KTR_NET, "%20s: found tag %d", __func__, idx);
348 return (pt);
349 }
350
351 pt = (const struct pppoe_tag*)ptn;
352 }
353
354 CTR2(KTR_NET, "%20s: not found tag %d", __func__, idx);
355 return (NULL);
356 }
357
358 /**************************************************************************
359 * Inlines to initialise or add tags to a session's tag list.
360 **************************************************************************/
361 /*
362 * Initialise the session's tag list.
363 */
364 static void
365 init_tags(sessp sp)
366 {
367 KASSERT(sp->neg != NULL, ("%s: no neg", __func__));
368 sp->neg->numtags = 0;
369 }
370
371 static void
372 insert_tag(sessp sp, const struct pppoe_tag *tp)
373 {
374 negp neg = sp->neg;
375 int i;
376
377 KASSERT(neg != NULL, ("%s: no neg", __func__));
378 if ((i = neg->numtags++) < NUMTAGS) {
379 neg->tags[i] = tp;
380 } else {
381 log(LOG_NOTICE, "ng_pppoe: asked to add too many tags to "
382 "packet\n");
383 neg->numtags--;
384 }
385 }
386
387 /*
388 * Make up a packet, using the tags filled out for the session.
389 *
390 * Assume that the actual pppoe header and ethernet header
391 * are filled out externally to this routine.
392 * Also assume that neg->wh points to the correct
393 * location at the front of the buffer space.
394 */
395 static void
396 make_packet(sessp sp) {
397 struct pppoe_full_hdr *wh = &sp->neg->pkt->pkt_header;
398 const struct pppoe_tag **tag;
399 char *dp;
400 int count;
401 int tlen;
402 uint16_t length = 0;
403
404 KASSERT((sp->neg != NULL) && (sp->neg->m != NULL),
405 ("%s: called from wrong state", __func__));
406 CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID);
407
408 dp = (char *)(&wh->ph + 1);
409 for (count = 0, tag = sp->neg->tags;
410 ((count < sp->neg->numtags) && (count < NUMTAGS));
411 tag++, count++) {
412 tlen = ntohs((*tag)->tag_len) + sizeof(**tag);
413 if ((length + tlen) > (ETHER_MAX_LEN - 4 - sizeof(*wh))) {
414 log(LOG_NOTICE, "ng_pppoe: tags too long\n");
415 sp->neg->numtags = count;
416 break; /* XXX chop off what's too long */
417 }
418 bcopy(*tag, (char *)dp, tlen);
419 length += tlen;
420 dp += tlen;
421 }
422 wh->ph.length = htons(length);
423 sp->neg->m->m_len = length + sizeof(*wh);
424 sp->neg->m->m_pkthdr.len = length + sizeof(*wh);
425 }
426
427 /**************************************************************************
428 * Routines to match a service. *
429 **************************************************************************/
430
431 /*
432 * Find a hook that has a service string that matches that
433 * we are seeking. For now use a simple string.
434 * In the future we may need something like regexp().
435 *
436 * Null string is a wildcard (ANY service), according to RFC2516.
437 * And historical FreeBSD wildcard is also "*".
438 */
439
440 static hook_p
441 pppoe_match_svc(node_p node, const struct pppoe_tag *tag)
442 {
443 const priv_p privp = NG_NODE_PRIVATE(node);
444 sessp sp;
445
446 LIST_FOREACH(sp, &privp->listeners, sessions) {
447 negp neg = sp->neg;
448
449 /* Empty Service-Name matches any service. */
450 if (neg->service_len == 0)
451 break;
452
453 /* Special case for a blank or "*" service name (wildcard). */
454 if (neg->service_len == 1 && neg->service.data[0] == '*')
455 break;
456
457 /* If the lengths don't match, that aint it. */
458 if (neg->service_len != ntohs(tag->tag_len))
459 continue;
460
461 if (strncmp((const char *)(tag + 1), neg->service.data,
462 ntohs(tag->tag_len)) == 0)
463 break;
464 }
465 CTR3(KTR_NET, "%20s: matched %p for %s", __func__,
466 sp?sp->hook:NULL, (const char *)(tag + 1));
467
468 return (sp?sp->hook:NULL);
469 }
470
471 /*
472 * Broadcast the PADI packet in m0 to all listening hooks.
473 * This routine is called when a PADI with empty Service-Name
474 * tag is received. Client should receive PADOs with all
475 * available services.
476 */
477 static int
478 pppoe_broadcast_padi(node_p node, struct mbuf *m0)
479 {
480 const priv_p privp = NG_NODE_PRIVATE(node);
481 sessp sp;
482 int error = 0;
483
484 LIST_FOREACH(sp, &privp->listeners, sessions) {
485 struct mbuf *m;
486
487 m = m_dup(m0, M_NOWAIT);
488 if (m == NULL)
489 return (ENOMEM);
490 NG_SEND_DATA_ONLY(error, sp->hook, m);
491 if (error)
492 return (error);
493 }
494
495 return (0);
496 }
497
498 /*
499 * Find a hook, which name equals to given service.
500 */
501 static hook_p
502 pppoe_find_svc(node_p node, const char *svc_name, int svc_len)
503 {
504 const priv_p privp = NG_NODE_PRIVATE(node);
505 sessp sp;
506
507 LIST_FOREACH(sp, &privp->listeners, sessions) {
508 negp neg = sp->neg;
509
510 if (neg->service_len == svc_len &&
511 strncmp(svc_name, neg->service.data, svc_len) == 0)
512 return (sp->hook);
513 }
514
515 return (NULL);
516 }
517
518 /**************************************************************************
519 * Routines to find a particular session that matches an incoming packet. *
520 **************************************************************************/
521 /* Find free session and add to hash. */
522 static uint16_t
523 pppoe_getnewsession(sessp sp)
524 {
525 const priv_p privp = NG_NODE_PRIVATE(NG_HOOK_NODE(sp->hook));
526 static uint16_t pppoe_sid = 1;
527 sessp tsp;
528 uint16_t val, hash;
529
530 restart:
531 /* Atomicity is not needed here as value will be checked. */
532 val = pppoe_sid++;
533 /* Spec says 0xFFFF is reserved, also don't use 0x0000. */
534 if (val == 0xffff || val == 0x0000)
535 val = pppoe_sid = 1;
536
537 /* Check it isn't already in use. */
538 hash = SESSHASH(val);
539 mtx_lock(&privp->sesshash[hash].mtx);
540 LIST_FOREACH(tsp, &privp->sesshash[hash].head, sessions) {
541 if (tsp->Session_ID == val)
542 break;
543 }
544 if (!tsp) {
545 sp->Session_ID = val;
546 LIST_INSERT_HEAD(&privp->sesshash[hash].head, sp, sessions);
547 }
548 mtx_unlock(&privp->sesshash[hash].mtx);
549 if (tsp)
550 goto restart;
551
552 CTR2(KTR_NET, "%20s: new sid %d", __func__, val);
553
554 return (val);
555 }
556
557 /* Add specified session to hash. */
558 static void
559 pppoe_addsession(sessp sp)
560 {
561 const priv_p privp = NG_NODE_PRIVATE(NG_HOOK_NODE(sp->hook));
562 uint16_t hash = SESSHASH(sp->Session_ID);
563
564 mtx_lock(&privp->sesshash[hash].mtx);
565 LIST_INSERT_HEAD(&privp->sesshash[hash].head, sp, sessions);
566 mtx_unlock(&privp->sesshash[hash].mtx);
567 }
568
569 /* Delete specified session from hash. */
570 static void
571 pppoe_delsession(sessp sp)
572 {
573 const priv_p privp = NG_NODE_PRIVATE(NG_HOOK_NODE(sp->hook));
574 uint16_t hash = SESSHASH(sp->Session_ID);
575
576 mtx_lock(&privp->sesshash[hash].mtx);
577 LIST_REMOVE(sp, sessions);
578 mtx_unlock(&privp->sesshash[hash].mtx);
579 }
580
581 /* Find matching peer/session combination. */
582 static sessp
583 pppoe_findsession(priv_p privp, const struct pppoe_full_hdr *wh)
584 {
585 uint16_t session = ntohs(wh->ph.sid);
586 uint16_t hash = SESSHASH(session);
587 sessp sp = NULL;
588
589 mtx_lock(&privp->sesshash[hash].mtx);
590 LIST_FOREACH(sp, &privp->sesshash[hash].head, sessions) {
591 if (sp->Session_ID == session &&
592 bcmp(sp->pkt_hdr.eh.ether_dhost,
593 wh->eh.ether_shost, ETHER_ADDR_LEN) == 0) {
594 break;
595 }
596 }
597 mtx_unlock(&privp->sesshash[hash].mtx);
598 CTR3(KTR_NET, "%20s: matched %p for %d", __func__, sp?sp->hook:NULL,
599 session);
600
601 return (sp);
602 }
603
604 static hook_p
605 pppoe_finduniq(node_p node, const struct pppoe_tag *tag)
606 {
607 hook_p hook = NULL;
608 sessp sp;
609
610 /* Cycle through all known hooks. */
611 LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) {
612 /* Skip any nonsession hook. */
613 if (NG_HOOK_PRIVATE(hook) == NULL)
614 continue;
615 sp = NG_HOOK_PRIVATE(hook);
616 /* Skip already connected sessions. */
617 if (sp->neg == NULL)
618 continue;
619 if (sp->neg->host_uniq_len == ntohs(tag->tag_len) &&
620 bcmp(sp->neg->host_uniq.data, (const char *)(tag + 1),
621 sp->neg->host_uniq_len) == 0)
622 break;
623 }
624 CTR3(KTR_NET, "%20s: matched %p for %p", __func__, hook, sp);
625
626 return (hook);
627 }
628
629 static hook_p
630 pppoe_findcookie(node_p node, const struct pppoe_tag *tag)
631 {
632 hook_p hook = NULL;
633 union uniq cookie;
634
635 bcopy(tag + 1, cookie.bytes, sizeof(void *));
636 /* Cycle through all known hooks. */
637 LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) {
638 /* Skip any nonsession hook. */
639 if (NG_HOOK_PRIVATE(hook) == NULL)
640 continue;
641 if (cookie.pointer == NG_HOOK_PRIVATE(hook))
642 break;
643 }
644 CTR3(KTR_NET, "%20s: matched %p for %p", __func__, hook, cookie.pointer);
645
646 return (hook);
647 }
648
649 /**************************************************************************
650 * Start of Netgraph entrypoints. *
651 **************************************************************************/
652
653 /*
654 * Allocate the private data structure and link it with node.
655 */
656 static int
657 ng_pppoe_constructor(node_p node)
658 {
659 priv_p privp;
660 int i;
661
662 /* Initialize private descriptor. */
663 privp = malloc(sizeof(*privp), M_NETGRAPH_PPPOE, M_WAITOK | M_ZERO);
664
665 /* Link structs together; this counts as our one reference to *node. */
666 NG_NODE_SET_PRIVATE(node, privp);
667 privp->node = node;
668
669 /* Initialize to standard mode. */
670 memset(&privp->eh.ether_dhost, 0xff, ETHER_ADDR_LEN);
671 privp->eh.ether_type = ETHERTYPE_PPPOE_DISC;
672
673 LIST_INIT(&privp->listeners);
674 for (i = 0; i < SESSHASHSIZE; i++) {
675 mtx_init(&privp->sesshash[i].mtx, "PPPoE hash mutex", NULL, MTX_DEF);
676 LIST_INIT(&privp->sesshash[i].head);
677 }
678
679 CTR3(KTR_NET, "%20s: created node [%x] (%p)",
680 __func__, node->nd_ID, node);
681
682 return (0);
683 }
684
685 /*
686 * Give our ok for a hook to be added...
687 * point the hook's private info to the hook structure.
688 *
689 * The following hook names are special:
690 * "ethernet": the hook that should be connected to a NIC.
691 * "debug": copies of data sent out here (when I write the code).
692 * All other hook names need only be unique. (the framework checks this).
693 */
694 static int
695 ng_pppoe_newhook(node_p node, hook_p hook, const char *name)
696 {
697 const priv_p privp = NG_NODE_PRIVATE(node);
698 sessp sp;
699
700 if (strcmp(name, NG_PPPOE_HOOK_ETHERNET) == 0) {
701 privp->ethernet_hook = hook;
702 NG_HOOK_SET_RCVDATA(hook, ng_pppoe_rcvdata_ether);
703 } else if (strcmp(name, NG_PPPOE_HOOK_DEBUG) == 0) {
704 privp->debug_hook = hook;
705 NG_HOOK_SET_RCVDATA(hook, ng_pppoe_rcvdata_debug);
706 } else {
707 /*
708 * Any other unique name is OK.
709 * The infrastructure has already checked that it's unique,
710 * so just allocate it and hook it in.
711 */
712 sp = malloc(sizeof(*sp), M_NETGRAPH_PPPOE, M_NOWAIT | M_ZERO);
713 if (sp == NULL)
714 return (ENOMEM);
715
716 NG_HOOK_SET_PRIVATE(hook, sp);
717 sp->hook = hook;
718 }
719 CTR5(KTR_NET, "%20s: node [%x] (%p) connected hook %s (%p)",
720 __func__, node->nd_ID, node, name, hook);
721
722 return(0);
723 }
724
725 /*
726 * Hook has been added successfully. Request the MAC address of
727 * the underlying Ethernet node.
728 */
729 static int
730 ng_pppoe_connect(hook_p hook)
731 {
732 const priv_p privp = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
733 struct ng_mesg *msg;
734 int error;
735
736 if (hook != privp->ethernet_hook)
737 return (0);
738
739 /*
740 * If this is Ethernet hook, then request MAC address
741 * from our downstream.
742 */
743 NG_MKMESSAGE(msg, NGM_ETHER_COOKIE, NGM_ETHER_GET_ENADDR, 0, M_NOWAIT);
744 if (msg == NULL)
745 return (ENOBUFS);
746
747 /*
748 * Our hook and peer hook have HK_INVALID flag set,
749 * so we can't use NG_SEND_MSG_HOOK() macro here.
750 */
751 NG_SEND_MSG_ID(error, privp->node, msg,
752 NG_NODE_ID(NG_PEER_NODE(privp->ethernet_hook)),
753 NG_NODE_ID(privp->node));
754
755 return (error);
756 }
757 /*
758 * Get a netgraph control message.
759 * Check it is one we understand. If needed, send a response.
760 * We sometimes save the address for an async action later.
761 * Always free the message.
762 */
763 static int
764 ng_pppoe_rcvmsg(node_p node, item_p item, hook_p lasthook)
765 {
766 priv_p privp = NG_NODE_PRIVATE(node);
767 struct ngpppoe_init_data *ourmsg = NULL;
768 struct ng_mesg *resp = NULL;
769 int error = 0;
770 hook_p hook = NULL;
771 sessp sp = NULL;
772 negp neg = NULL;
773 struct ng_mesg *msg;
774
775 NGI_GET_MSG(item, msg);
776 CTR5(KTR_NET, "%20s: node [%x] (%p) got message %d with cookie %d",
777 __func__, node->nd_ID, node, msg->header.cmd,
778 msg->header.typecookie);
779
780 /* Deal with message according to cookie and command. */
781 switch (msg->header.typecookie) {
782 case NGM_PPPOE_COOKIE:
783 switch (msg->header.cmd) {
784 case NGM_PPPOE_CONNECT:
785 case NGM_PPPOE_LISTEN:
786 case NGM_PPPOE_OFFER:
787 case NGM_PPPOE_SERVICE:
788 case NGM_PPPOE_SEND_HURL:
789 case NGM_PPPOE_SEND_MOTM:
790 ourmsg = (struct ngpppoe_init_data *)msg->data;
791 if (msg->header.arglen < sizeof(*ourmsg)) {
792 log(LOG_ERR, "ng_pppoe[%x]: init data too "
793 "small\n", node->nd_ID);
794 LEAVE(EMSGSIZE);
795 }
796 if (msg->header.cmd == NGM_PPPOE_SEND_HURL ||
797 msg->header.cmd == NGM_PPPOE_SEND_MOTM) {
798 if (msg->header.arglen - sizeof(*ourmsg) >
799 PPPOE_PADM_VALUE_SIZE) {
800 log(LOG_ERR, "ng_pppoe[%x]: message "
801 "too big\n", node->nd_ID);
802 LEAVE(EMSGSIZE);
803 }
804 } else {
805 if (msg->header.arglen - sizeof(*ourmsg) >
806 PPPOE_SERVICE_NAME_SIZE) {
807 log(LOG_ERR, "ng_pppoe[%x]: service name "
808 "too big\n", node->nd_ID);
809 LEAVE(EMSGSIZE);
810 }
811 }
812 if (msg->header.arglen - sizeof(*ourmsg) <
813 ourmsg->data_len) {
814 log(LOG_ERR, "ng_pppoe[%x]: init data has bad "
815 "length, %d should be %zd\n", node->nd_ID,
816 ourmsg->data_len,
817 msg->header.arglen - sizeof (*ourmsg));
818 LEAVE(EMSGSIZE);
819 }
820
821 /* Make sure strcmp will terminate safely. */
822 ourmsg->hook[sizeof(ourmsg->hook) - 1] = '\0';
823
824 /* Find hook by name. */
825 hook = ng_findhook(node, ourmsg->hook);
826 if (hook == NULL)
827 LEAVE(ENOENT);
828
829 sp = NG_HOOK_PRIVATE(hook);
830 if (sp == NULL)
831 LEAVE(EINVAL);
832
833 if (msg->header.cmd == NGM_PPPOE_LISTEN) {
834 /*
835 * Ensure we aren't already listening for this
836 * service.
837 */
838 if (pppoe_find_svc(node, ourmsg->data,
839 ourmsg->data_len) != NULL)
840 LEAVE(EEXIST);
841 }
842
843 /*
844 * PPPOE_SERVICE advertisments are set up
845 * on sessions that are in PRIMED state.
846 */
847 if (msg->header.cmd == NGM_PPPOE_SERVICE)
848 break;
849
850 /*
851 * PADM messages are set up on active sessions.
852 */
853 if (msg->header.cmd == NGM_PPPOE_SEND_HURL ||
854 msg->header.cmd == NGM_PPPOE_SEND_MOTM) {
855 if (sp->state != PPPOE_NEWCONNECTED &&
856 sp->state != PPPOE_CONNECTED) {
857 log(LOG_NOTICE, "ng_pppoe[%x]: session is not "
858 "active\n", node->nd_ID);
859 LEAVE(EISCONN);
860 }
861 break;
862 }
863
864 if (sp->state != PPPOE_SNONE) {
865 log(LOG_NOTICE, "ng_pppoe[%x]: Session already "
866 "active\n", node->nd_ID);
867 LEAVE(EISCONN);
868 }
869
870 /*
871 * Set up prototype header.
872 */
873 neg = malloc(sizeof(*neg), M_NETGRAPH_PPPOE,
874 M_NOWAIT | M_ZERO);
875
876 if (neg == NULL)
877 LEAVE(ENOMEM);
878
879 neg->m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
880 if (neg->m == NULL) {
881 free(neg, M_NETGRAPH_PPPOE);
882 LEAVE(ENOBUFS);
883 }
884 neg->m->m_pkthdr.rcvif = NULL;
885 sp->neg = neg;
886 ng_callout_init(&neg->handle);
887 neg->m->m_len = sizeof(struct pppoe_full_hdr);
888 neg->pkt = mtod(neg->m, union packet*);
889 memcpy((void *)&neg->pkt->pkt_header.eh,
890 &privp->eh, sizeof(struct ether_header));
891 neg->pkt->pkt_header.ph.ver = 0x1;
892 neg->pkt->pkt_header.ph.type = 0x1;
893 neg->pkt->pkt_header.ph.sid = 0x0000;
894 neg->timeout = 0;
895
896 sp->creator = NGI_RETADDR(item);
897 }
898 switch (msg->header.cmd) {
899 case NGM_PPPOE_GET_STATUS:
900 {
901 struct ngpppoestat *stats;
902
903 NG_MKRESPONSE(resp, msg, sizeof(*stats), M_NOWAIT);
904 if (!resp)
905 LEAVE(ENOMEM);
906
907 stats = (struct ngpppoestat *) resp->data;
908 stats->packets_in = privp->packets_in;
909 stats->packets_out = privp->packets_out;
910 break;
911 }
912 case NGM_PPPOE_CONNECT:
913 {
914 /*
915 * Check the hook exists and is Uninitialised.
916 * Send a PADI request, and start the timeout logic.
917 * Store the originator of this message so we can send
918 * a success or fail message to them later.
919 * Move the session to SINIT.
920 * Set up the session to the correct state and
921 * start it.
922 */
923 int acnpos, acnlen = 0, acnsep = 0;
924 int hupos, hulen = 0, husep = 0;
925 int i, srvpos, srvlen;
926 acnpos = 0;
927 for (i = 0; i < ourmsg->data_len; i++) {
928 if (ourmsg->data[i] == '\\') {
929 acnlen = i;
930 acnsep = 1;
931 break;
932 }
933 }
934 hupos = acnlen + acnsep;
935 for (i = hupos; i < ourmsg->data_len; i++) {
936 if (ourmsg->data[i] == '|') {
937 hulen = i - hupos;
938 husep = 1;
939 break;
940 }
941 }
942 srvpos = hupos + hulen + husep;
943 srvlen = ourmsg->data_len - srvpos;
944
945 bcopy(ourmsg->data + acnpos, neg->ac_name.data, acnlen);
946 neg->ac_name_len = acnlen;
947
948 neg->host_uniq.hdr.tag_type = PTT_HOST_UNIQ;
949 if (hulen == 0) {
950 /* Not provided, generate one */
951 neg->host_uniq.hdr.tag_len = htons(sizeof(sp));
952 bcopy(&sp, neg->host_uniq.data, sizeof(sp));
953 neg->host_uniq_len = sizeof(sp);
954 } else if (hulen > 2 && ourmsg->data[hupos] == '' &&
955 ourmsg->data[hupos + 1] == 'x' && hulen % 2 == 0) {
956 /* Hex encoded */
957 static const char hexdig[16] = "0123456789abcdef";
958 int j;
959
960 neg->host_uniq.hdr.tag_len = htons((uint16_t)(hulen / 2 - 1));
961 for (i = 0; i < hulen - 2; i++) {
962 for (j = 0;
963 j < 16 &&
964 ourmsg->data[hupos + 2 + i] != hexdig[j];
965 j++);
966 if (j == 16)
967 LEAVE(EINVAL);
968 if (i % 2 == 0)
969 neg->host_uniq.data[i / 2] = j << 4;
970 else
971 neg->host_uniq.data[i / 2] |= j;
972 }
973 neg->host_uniq_len = hulen / 2 - 1;
974 } else {
975 /* Plain string */
976 neg->host_uniq.hdr.tag_len = htons((uint16_t)hulen);
977 bcopy(ourmsg->data + hupos, neg->host_uniq.data, hulen);
978 neg->host_uniq_len = hulen;
979 }
980
981 neg->service.hdr.tag_type = PTT_SRV_NAME;
982 neg->service.hdr.tag_len = htons((uint16_t)srvlen);
983 bcopy(ourmsg->data + srvpos, neg->service.data, srvlen);
984 neg->service_len = srvlen;
985 pppoe_start(sp);
986 break;
987 }
988 case NGM_PPPOE_LISTEN:
989 /*
990 * Check the hook exists and is Uninitialised.
991 * Install the service matching string.
992 * Store the originator of this message so we can send
993 * a success or fail message to them later.
994 * Move the hook to 'LISTENING'
995 */
996 neg->service.hdr.tag_type = PTT_SRV_NAME;
997 neg->service.hdr.tag_len =
998 htons((uint16_t)ourmsg->data_len);
999
1000 if (ourmsg->data_len)
1001 bcopy(ourmsg->data, neg->service.data,
1002 ourmsg->data_len);
1003 neg->service_len = ourmsg->data_len;
1004 neg->pkt->pkt_header.ph.code = PADT_CODE;
1005 /*
1006 * Wait for PADI packet coming from Ethernet.
1007 */
1008 sp->state = PPPOE_LISTENING;
1009 LIST_INSERT_HEAD(&privp->listeners, sp, sessions);
1010 break;
1011 case NGM_PPPOE_OFFER:
1012 /*
1013 * Check the hook exists and is Uninitialised.
1014 * Store the originator of this message so we can send
1015 * a success of fail message to them later.
1016 * Store the AC-Name given and go to PRIMED.
1017 */
1018 neg->ac_name.hdr.tag_type = PTT_AC_NAME;
1019 neg->ac_name.hdr.tag_len =
1020 htons((uint16_t)ourmsg->data_len);
1021 if (ourmsg->data_len)
1022 bcopy(ourmsg->data, neg->ac_name.data,
1023 ourmsg->data_len);
1024 neg->ac_name_len = ourmsg->data_len;
1025 neg->pkt->pkt_header.ph.code = PADO_CODE;
1026 /*
1027 * Wait for PADI packet coming from hook.
1028 */
1029 sp->state = PPPOE_PRIMED;
1030 break;
1031 case NGM_PPPOE_SERVICE:
1032 /*
1033 * Check the session is primed.
1034 * for now just allow ONE service to be advertised.
1035 * If you do it twice you just overwrite.
1036 */
1037 if (sp->state != PPPOE_PRIMED) {
1038 log(LOG_NOTICE, "ng_pppoe[%x]: session not "
1039 "primed\n", node->nd_ID);
1040 LEAVE(EISCONN);
1041 }
1042 neg = sp->neg;
1043 neg->service.hdr.tag_type = PTT_SRV_NAME;
1044 neg->service.hdr.tag_len =
1045 htons((uint16_t)ourmsg->data_len);
1046
1047 if (ourmsg->data_len)
1048 bcopy(ourmsg->data, neg->service.data,
1049 ourmsg->data_len);
1050 neg->service_len = ourmsg->data_len;
1051 break;
1052 case NGM_PPPOE_SETMODE:
1053 {
1054 char *s;
1055 size_t len;
1056
1057 if (msg->header.arglen == 0)
1058 LEAVE(EINVAL);
1059
1060 s = (char *)msg->data;
1061 len = msg->header.arglen - 1;
1062
1063 /* Search for matching mode string. */
1064 if (len == strlen(NG_PPPOE_STANDARD) &&
1065 (strncmp(NG_PPPOE_STANDARD, s, len) == 0)) {
1066 privp->flags = 0;
1067 privp->eh.ether_type = ETHERTYPE_PPPOE_DISC;
1068 break;
1069 }
1070 if (len == strlen(NG_PPPOE_3COM) &&
1071 (strncmp(NG_PPPOE_3COM, s, len) == 0)) {
1072 privp->flags |= COMPAT_3COM;
1073 privp->eh.ether_type =
1074 ETHERTYPE_PPPOE_3COM_DISC;
1075 break;
1076 }
1077 if (len == strlen(NG_PPPOE_DLINK) &&
1078 (strncmp(NG_PPPOE_DLINK, s, len) == 0)) {
1079 privp->flags |= COMPAT_DLINK;
1080 break;
1081 }
1082 error = EINVAL;
1083 break;
1084 }
1085 case NGM_PPPOE_GETMODE:
1086 {
1087 char *s;
1088 size_t len = 0;
1089
1090 if (privp->flags == 0)
1091 len += strlen(NG_PPPOE_STANDARD) + 1;
1092 if (privp->flags & COMPAT_3COM)
1093 len += strlen(NG_PPPOE_3COM) + 1;
1094 if (privp->flags & COMPAT_DLINK)
1095 len += strlen(NG_PPPOE_DLINK) + 1;
1096
1097 NG_MKRESPONSE(resp, msg, len, M_NOWAIT);
1098 if (resp == NULL)
1099 LEAVE(ENOMEM);
1100
1101 s = (char *)resp->data;
1102 if (privp->flags == 0) {
1103 len = strlen(NG_PPPOE_STANDARD);
1104 strlcpy(s, NG_PPPOE_STANDARD, len + 1);
1105 break;
1106 }
1107 if (privp->flags & COMPAT_3COM) {
1108 len = strlen(NG_PPPOE_3COM);
1109 strlcpy(s, NG_PPPOE_3COM, len + 1);
1110 s += len;
1111 }
1112 if (privp->flags & COMPAT_DLINK) {
1113 if (s != resp->data)
1114 *s++ = '|';
1115 len = strlen(NG_PPPOE_DLINK);
1116 strlcpy(s, NG_PPPOE_DLINK, len + 1);
1117 }
1118 break;
1119 }
1120 case NGM_PPPOE_SETENADDR:
1121 if (msg->header.arglen != ETHER_ADDR_LEN)
1122 LEAVE(EINVAL);
1123 bcopy(msg->data, &privp->eh.ether_shost,
1124 ETHER_ADDR_LEN);
1125 break;
1126 case NGM_PPPOE_SETMAXP:
1127 if (msg->header.arglen != sizeof(uint16_t))
1128 LEAVE(EINVAL);
1129 privp->max_payload.hdr.tag_type = PTT_MAX_PAYL;
1130 privp->max_payload.hdr.tag_len = htons(sizeof(uint16_t));
1131 privp->max_payload.data = htons(*((uint16_t *)msg->data));
1132 break;
1133 case NGM_PPPOE_SEND_HURL:
1134 {
1135 struct mbuf *m;
1136
1137 /* Generate a packet of that type. */
1138 m = m_gethdr(M_NOWAIT, MT_DATA);
1139 if (m == NULL)
1140 log(LOG_NOTICE, "ng_pppoe[%x]: session out of "
1141 "mbufs\n", node->nd_ID);
1142 else {
1143 struct pppoe_full_hdr *wh;
1144 struct pppoe_tag *tag;
1145 int error = 0;
1146
1147 wh = mtod(m, struct pppoe_full_hdr *);
1148 bcopy(&sp->pkt_hdr, wh, sizeof(*wh));
1149
1150 /* Revert the stored header to DISC/PADM mode. */
1151 wh->ph.code = PADM_CODE;
1152 /*
1153 * Configure ethertype depending on what
1154 * was used during sessions stage.
1155 */
1156 if (wh->eh.ether_type ==
1157 ETHERTYPE_PPPOE_3COM_SESS)
1158 wh->eh.ether_type = ETHERTYPE_PPPOE_3COM_DISC;
1159 else
1160 wh->eh.ether_type = ETHERTYPE_PPPOE_DISC;
1161 /*
1162 * Add PADM message and adjust sizes.
1163 */
1164 tag = (void *)(&wh->ph + 1);
1165 tag->tag_type = PTT_HURL;
1166 tag->tag_len = htons(ourmsg->data_len);
1167 strncpy((char *)(tag + 1), ourmsg->data, ourmsg->data_len);
1168 m->m_pkthdr.len = m->m_len = sizeof(*wh) + sizeof(*tag) +
1169 ourmsg->data_len;
1170 wh->ph.length = htons(sizeof(*tag) + ourmsg->data_len);
1171 NG_SEND_DATA_ONLY(error,
1172 privp->ethernet_hook, m);
1173 }
1174 break;
1175 }
1176 case NGM_PPPOE_SEND_MOTM:
1177 {
1178 struct mbuf *m;
1179
1180 /* Generate a packet of that type. */
1181 m = m_gethdr(M_NOWAIT, MT_DATA);
1182 if (m == NULL)
1183 log(LOG_NOTICE, "ng_pppoe[%x]: session out of "
1184 "mbufs\n", node->nd_ID);
1185 else {
1186 struct pppoe_full_hdr *wh;
1187 struct pppoe_tag *tag;
1188 int error = 0;
1189
1190 wh = mtod(m, struct pppoe_full_hdr *);
1191 bcopy(&sp->pkt_hdr, wh, sizeof(*wh));
1192
1193 /* Revert the stored header to DISC/PADM mode. */
1194 wh->ph.code = PADM_CODE;
1195 /*
1196 * Configure ethertype depending on what
1197 * was used during sessions stage.
1198 */
1199 if (wh->eh.ether_type ==
1200 ETHERTYPE_PPPOE_3COM_SESS)
1201 wh->eh.ether_type = ETHERTYPE_PPPOE_3COM_DISC;
1202 else
1203 wh->eh.ether_type = ETHERTYPE_PPPOE_DISC;
1204 /*
1205 * Add PADM message and adjust sizes.
1206 */
1207 tag = (void *)(&wh->ph + 1);
1208 tag->tag_type = PTT_MOTM;
1209 tag->tag_len = htons(ourmsg->data_len);
1210 strncpy((char *)(tag + 1), ourmsg->data, ourmsg->data_len);
1211 m->m_pkthdr.len = m->m_len = sizeof(*wh) + sizeof(*tag) +
1212 ourmsg->data_len;
1213 wh->ph.length = htons(sizeof(*tag) + ourmsg->data_len);
1214 NG_SEND_DATA_ONLY(error,
1215 privp->ethernet_hook, m);
1216 }
1217 break;
1218 }
1219 default:
1220 LEAVE(EINVAL);
1221 }
1222 break;
1223 case NGM_ETHER_COOKIE:
1224 if (!(msg->header.flags & NGF_RESP))
1225 LEAVE(EINVAL);
1226 switch (msg->header.cmd) {
1227 case NGM_ETHER_GET_ENADDR:
1228 if (msg->header.arglen != ETHER_ADDR_LEN)
1229 LEAVE(EINVAL);
1230 bcopy(msg->data, &privp->eh.ether_shost,
1231 ETHER_ADDR_LEN);
1232 break;
1233 default:
1234 LEAVE(EINVAL);
1235 }
1236 break;
1237 default:
1238 LEAVE(EINVAL);
1239 }
1240
1241 /* Take care of synchronous response, if any. */
1242 quit:
1243 CTR2(KTR_NET, "%20s: returning %d", __func__, error);
1244 NG_RESPOND_MSG(error, node, item, resp);
1245 /* Free the message and return. */
1246 NG_FREE_MSG(msg);
1247 return(error);
1248 }
1249
1250 /*
1251 * Start a client into the first state. A separate function because
1252 * it can be needed if the negotiation times out.
1253 */
1254 static void
1255 pppoe_start(sessp sp)
1256 {
1257 hook_p hook = sp->hook;
1258 node_p node = NG_HOOK_NODE(hook);
1259 priv_p privp = NG_NODE_PRIVATE(node);
1260 negp neg = sp->neg;
1261 struct mbuf *m0;
1262 int error;
1263
1264 /*
1265 * Kick the state machine into starting up.
1266 */
1267 CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID);
1268 sp->state = PPPOE_SINIT;
1269 /*
1270 * Reset the packet header to broadcast. Since we are
1271 * in a client mode use configured ethertype.
1272 */
1273 memcpy((void *)&neg->pkt->pkt_header.eh, &privp->eh,
1274 sizeof(struct ether_header));
1275 neg->pkt->pkt_header.ph.code = PADI_CODE;
1276 init_tags(sp);
1277 insert_tag(sp, &neg->host_uniq.hdr);
1278 insert_tag(sp, &neg->service.hdr);
1279 if (privp->max_payload.data != 0)
1280 insert_tag(sp, &privp->max_payload.hdr);
1281 make_packet(sp);
1282 /*
1283 * Send packet and prepare to retransmit it after timeout.
1284 */
1285 ng_callout(&neg->handle, node, hook, PPPOE_INITIAL_TIMEOUT * hz,
1286 pppoe_ticker, NULL, 0);
1287 neg->timeout = PPPOE_INITIAL_TIMEOUT * 2;
1288 m0 = m_copypacket(neg->m, M_NOWAIT);
1289 NG_SEND_DATA_ONLY(error, privp->ethernet_hook, m0);
1290 }
1291
1292 static int
1293 send_acname(sessp sp, const struct pppoe_tag *tag)
1294 {
1295 int error, tlen;
1296 struct ng_mesg *msg;
1297 struct ngpppoe_sts *sts;
1298
1299 CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID);
1300
1301 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_ACNAME,
1302 sizeof(struct ngpppoe_sts), M_NOWAIT);
1303 if (msg == NULL)
1304 return (ENOMEM);
1305
1306 sts = (struct ngpppoe_sts *)msg->data;
1307 tlen = min(NG_HOOKSIZ - 1, ntohs(tag->tag_len));
1308 strncpy(sts->hook, (const char *)(tag + 1), tlen);
1309 sts->hook[tlen] = '\0';
1310 NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0);
1311
1312 return (error);
1313 }
1314
1315 static int
1316 send_sessionid(sessp sp)
1317 {
1318 int error;
1319 struct ng_mesg *msg;
1320
1321 CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID);
1322
1323 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_SESSIONID,
1324 sizeof(uint16_t), M_NOWAIT);
1325 if (msg == NULL)
1326 return (ENOMEM);
1327
1328 *(uint16_t *)msg->data = sp->Session_ID;
1329 NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0);
1330
1331 return (error);
1332 }
1333
1334 static int
1335 send_maxp(sessp sp, const struct pppoe_tag *tag)
1336 {
1337 int error;
1338 struct ng_mesg *msg;
1339 struct ngpppoe_maxp *maxp;
1340
1341 CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID);
1342
1343 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_SETMAXP,
1344 sizeof(struct ngpppoe_maxp), M_NOWAIT);
1345 if (msg == NULL)
1346 return (ENOMEM);
1347
1348 maxp = (struct ngpppoe_maxp *)msg->data;
1349 strncpy(maxp->hook, NG_HOOK_NAME(sp->hook), NG_HOOKSIZ);
1350 maxp->data = ntohs(((const struct maxptag *)tag)->data);
1351 NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0);
1352
1353 return (error);
1354 }
1355
1356 static int
1357 send_hurl(sessp sp, const struct pppoe_tag *tag)
1358 {
1359 int error, tlen;
1360 struct ng_mesg *msg;
1361 struct ngpppoe_padm *padm;
1362
1363 CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID);
1364
1365 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_HURL,
1366 sizeof(struct ngpppoe_padm), M_NOWAIT);
1367 if (msg == NULL)
1368 return (ENOMEM);
1369
1370 padm = (struct ngpppoe_padm *)msg->data;
1371 tlen = min(PPPOE_PADM_VALUE_SIZE - 1, ntohs(tag->tag_len));
1372 strncpy(padm->msg, (const char *)(tag + 1), tlen);
1373 padm->msg[tlen] = '\0';
1374 NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0);
1375
1376 return (error);
1377 }
1378
1379 static int
1380 send_motm(sessp sp, const struct pppoe_tag *tag)
1381 {
1382 int error, tlen;
1383 struct ng_mesg *msg;
1384 struct ngpppoe_padm *padm;
1385
1386 CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID);
1387
1388 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_MOTM,
1389 sizeof(struct ngpppoe_padm), M_NOWAIT);
1390 if (msg == NULL)
1391 return (ENOMEM);
1392
1393 padm = (struct ngpppoe_padm *)msg->data;
1394 tlen = min(PPPOE_PADM_VALUE_SIZE - 1, ntohs(tag->tag_len));
1395 strncpy(padm->msg, (const char *)(tag + 1), tlen);
1396 padm->msg[tlen] = '\0';
1397 NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0);
1398
1399 return (error);
1400 }
1401
1402 /*
1403 * Receive data from session hook and do something with it.
1404 */
1405 static int
1406 ng_pppoe_rcvdata(hook_p hook, item_p item)
1407 {
1408 node_p node = NG_HOOK_NODE(hook);
1409 const priv_p privp = NG_NODE_PRIVATE(node);
1410 sessp sp = NG_HOOK_PRIVATE(hook);
1411 struct pppoe_full_hdr *wh;
1412 struct mbuf *m;
1413 int error;
1414
1415 CTR6(KTR_NET, "%20s: node [%x] (%p) received %p on \"%s\" (%p)",
1416 __func__, node->nd_ID, node, item, hook->hk_name, hook);
1417
1418 NGI_GET_M(item, m);
1419 switch (sp->state) {
1420 case PPPOE_NEWCONNECTED:
1421 case PPPOE_CONNECTED: {
1422 /*
1423 * Remove PPP address and control fields, if any.
1424 * For example, ng_ppp(4) always sends LCP packets
1425 * with address and control fields as required by
1426 * generic PPP. PPPoE is an exception to the rule.
1427 */
1428 if (m->m_pkthdr.len >= 2) {
1429 if (m->m_len < 2 && !(m = m_pullup(m, 2)))
1430 LEAVE(ENOBUFS);
1431 if (mtod(m, u_char *)[0] == 0xff &&
1432 mtod(m, u_char *)[1] == 0x03)
1433 m_adj(m, 2);
1434 }
1435 /*
1436 * Bang in a pre-made header, and set the length up
1437 * to be correct. Then send it to the ethernet driver.
1438 */
1439 M_PREPEND(m, sizeof(*wh), M_NOWAIT);
1440 if (m == NULL)
1441 LEAVE(ENOBUFS);
1442
1443 wh = mtod(m, struct pppoe_full_hdr *);
1444 bcopy(&sp->pkt_hdr, wh, sizeof(*wh));
1445 wh->ph.length = htons(m->m_pkthdr.len - sizeof(*wh));
1446 NG_FWD_NEW_DATA(error, item, privp->ethernet_hook, m);
1447 privp->packets_out++;
1448 break;
1449 }
1450 case PPPOE_PRIMED: {
1451 struct {
1452 struct pppoe_tag hdr;
1453 union uniq data;
1454 } __packed uniqtag;
1455 const struct pppoe_tag *tag;
1456 struct mbuf *m0;
1457 const struct pppoe_hdr *ph;
1458 negp neg = sp->neg;
1459 uint16_t session;
1460 uint16_t length;
1461 uint8_t code;
1462
1463 /*
1464 * A PADI packet is being returned by the application
1465 * that has set up this hook. This indicates that it
1466 * wants us to offer service.
1467 */
1468 if (m->m_len < sizeof(*wh)) {
1469 m = m_pullup(m, sizeof(*wh));
1470 if (m == NULL)
1471 LEAVE(ENOBUFS);
1472 }
1473 wh = mtod(m, struct pppoe_full_hdr *);
1474 ph = &wh->ph;
1475 session = ntohs(wh->ph.sid);
1476 length = ntohs(wh->ph.length);
1477 code = wh->ph.code;
1478 /* Use peers mode in session. */
1479 neg->pkt->pkt_header.eh.ether_type = wh->eh.ether_type;
1480 if (code != PADI_CODE)
1481 LEAVE(EINVAL);
1482 ng_uncallout(&neg->handle, node);
1483
1484 /*
1485 * This is the first time we hear
1486 * from the client, so note it's
1487 * unicast address, replacing the
1488 * broadcast address.
1489 */
1490 bcopy(wh->eh.ether_shost,
1491 neg->pkt->pkt_header.eh.ether_dhost,
1492 ETHER_ADDR_LEN);
1493 sp->state = PPPOE_SOFFER;
1494 neg->timeout = 0;
1495 neg->pkt->pkt_header.ph.code = PADO_CODE;
1496
1497 /*
1498 * Start working out the tags to respond with.
1499 */
1500 uniqtag.hdr.tag_type = PTT_AC_COOKIE;
1501 uniqtag.hdr.tag_len = htons((u_int16_t)sizeof(sp));
1502 uniqtag.data.pointer = sp;
1503 init_tags(sp);
1504 insert_tag(sp, &neg->ac_name.hdr); /* AC_NAME */
1505 if ((tag = get_tag(ph, PTT_SRV_NAME)))
1506 insert_tag(sp, tag); /* return service */
1507 /*
1508 * If we have a NULL service request
1509 * and have an extra service defined in this hook,
1510 * then also add a tag for the extra service.
1511 * XXX this is a hack. eventually we should be able
1512 * to support advertising many services, not just one
1513 */
1514 if (((tag == NULL) || (tag->tag_len == 0)) &&
1515 (neg->service.hdr.tag_len != 0)) {
1516 insert_tag(sp, &neg->service.hdr); /* SERVICE */
1517 }
1518 if ((tag = get_tag(ph, PTT_HOST_UNIQ)))
1519 insert_tag(sp, tag); /* returned hostunique */
1520 insert_tag(sp, &uniqtag.hdr);
1521 scan_tags(sp, ph);
1522 make_packet(sp);
1523 /*
1524 * Send the offer but if they don't respond
1525 * in PPPOE_OFFER_TIMEOUT seconds, forget about it.
1526 */
1527 ng_callout(&neg->handle, node, hook, PPPOE_OFFER_TIMEOUT * hz,
1528 pppoe_ticker, NULL, 0);
1529 m0 = m_copypacket(sp->neg->m, M_NOWAIT);
1530 NG_FWD_NEW_DATA(error, item, privp->ethernet_hook, m0);
1531 privp->packets_out++;
1532 break;
1533 }
1534
1535 /*
1536 * Packets coming from the hook make no sense
1537 * to sessions in the rest of states. Throw them away.
1538 */
1539 default:
1540 LEAVE(ENETUNREACH);
1541 }
1542 quit:
1543 if (item)
1544 NG_FREE_ITEM(item);
1545 NG_FREE_M(m);
1546 return (error);
1547 }
1548
1549 /*
1550 * Receive data from ether and do something with it.
1551 */
1552 static int
1553 ng_pppoe_rcvdata_ether(hook_p hook, item_p item)
1554 {
1555 node_p node = NG_HOOK_NODE(hook);
1556 const priv_p privp = NG_NODE_PRIVATE(node);
1557 sessp sp;
1558 const struct pppoe_tag *utag = NULL, *tag = NULL;
1559 const struct pppoe_tag sntag = { PTT_SRV_NAME, 0 };
1560 const struct pppoe_full_hdr *wh;
1561 const struct pppoe_hdr *ph;
1562 negp neg = NULL;
1563 struct mbuf *m;
1564 hook_p sendhook;
1565 int error = 0;
1566 uint16_t session;
1567 uint16_t length;
1568 uint8_t code;
1569 struct mbuf *m0;
1570
1571 CTR6(KTR_NET, "%20s: node [%x] (%p) received %p on \"%s\" (%p)",
1572 __func__, node->nd_ID, node, item, hook->hk_name, hook);
1573
1574 NGI_GET_M(item, m);
1575 /*
1576 * Dig out various fields from the packet.
1577 * Use them to decide where to send it.
1578 */
1579 privp->packets_in++;
1580 if( m->m_len < sizeof(*wh)) {
1581 m = m_pullup(m, sizeof(*wh)); /* Checks length */
1582 if (m == NULL) {
1583 log(LOG_NOTICE, "ng_pppoe[%x]: couldn't "
1584 "m_pullup(wh)\n", node->nd_ID);
1585 LEAVE(ENOBUFS);
1586 }
1587 }
1588 wh = mtod(m, struct pppoe_full_hdr *);
1589 length = ntohs(wh->ph.length);
1590 switch(wh->eh.ether_type) {
1591 case ETHERTYPE_PPPOE_3COM_DISC: /* fall through */
1592 case ETHERTYPE_PPPOE_DISC:
1593 /*
1594 * We need to try to make sure that the tag area
1595 * is contiguous, or we could wander off the end
1596 * of a buffer and make a mess.
1597 * (Linux wouldn't have this problem).
1598 */
1599 if (m->m_pkthdr.len <= MHLEN) {
1600 if( m->m_len < m->m_pkthdr.len) {
1601 m = m_pullup(m, m->m_pkthdr.len);
1602 if (m == NULL) {
1603 log(LOG_NOTICE, "ng_pppoe[%x]: "
1604 "couldn't m_pullup(pkthdr)\n",
1605 node->nd_ID);
1606 LEAVE(ENOBUFS);
1607 }
1608 }
1609 }
1610 if (m->m_len != m->m_pkthdr.len) {
1611 /*
1612 * It's not all in one piece.
1613 * We need to do extra work.
1614 * Put it into a cluster.
1615 */
1616 struct mbuf *n;
1617 n = m_dup(m, M_NOWAIT);
1618 m_freem(m);
1619 m = n;
1620 if (m) {
1621 /* just check we got a cluster */
1622 if (m->m_len != m->m_pkthdr.len) {
1623 m_freem(m);
1624 m = NULL;
1625 }
1626 }
1627 if (m == NULL) {
1628 log(LOG_NOTICE, "ng_pppoe[%x]: packet "
1629 "fragmented\n", node->nd_ID);
1630 LEAVE(EMSGSIZE);
1631 }
1632 }
1633 wh = mtod(m, struct pppoe_full_hdr *);
1634 length = ntohs(wh->ph.length);
1635 ph = &wh->ph;
1636 session = ntohs(wh->ph.sid);
1637 code = wh->ph.code;
1638
1639 switch(code) {
1640 case PADI_CODE:
1641 /*
1642 * We are a server:
1643 * Look for a hook with the required service and send
1644 * the ENTIRE packet up there. It should come back to
1645 * a new hook in PRIMED state. Look there for further
1646 * processing.
1647 */
1648 tag = get_tag(ph, PTT_SRV_NAME);
1649 if (tag == NULL)
1650 tag = &sntag;
1651
1652 /*
1653 * First, try to match Service-Name against our
1654 * listening hooks. If no success and we are in D-Link
1655 * compat mode and Service-Name is empty, then we
1656 * broadcast the PADI to all listening hooks.
1657 */
1658 sendhook = pppoe_match_svc(node, tag);
1659 if (sendhook != NULL)
1660 NG_FWD_NEW_DATA(error, item, sendhook, m);
1661 else if (privp->flags & COMPAT_DLINK &&
1662 ntohs(tag->tag_len) == 0)
1663 error = pppoe_broadcast_padi(node, m);
1664 else
1665 error = ENETUNREACH;
1666 break;
1667 case PADO_CODE:
1668 /*
1669 * We are a client:
1670 * Use the host_uniq tag to find the hook this is in
1671 * response to. Received #2, now send #3
1672 * For now simply accept the first we receive.
1673 */
1674 utag = get_tag(ph, PTT_HOST_UNIQ);
1675 if (utag == NULL) {
1676 log(LOG_NOTICE, "ng_pppoe[%x]: no host "
1677 "unique field\n", node->nd_ID);
1678 LEAVE(ENETUNREACH);
1679 }
1680
1681 sendhook = pppoe_finduniq(node, utag);
1682 if (sendhook == NULL) {
1683 log(LOG_NOTICE, "ng_pppoe[%x]: no "
1684 "matching session\n", node->nd_ID);
1685 LEAVE(ENETUNREACH);
1686 }
1687
1688 /*
1689 * Check the session is in the right state.
1690 * It needs to be in PPPOE_SINIT.
1691 */
1692 sp = NG_HOOK_PRIVATE(sendhook);
1693 if (sp->state == PPPOE_SREQ ||
1694 sp->state == PPPOE_CONNECTED) {
1695 break; /* Multiple PADO is OK. */
1696 }
1697 if (sp->state != PPPOE_SINIT) {
1698 log(LOG_NOTICE, "ng_pppoe[%x]: session "
1699 "in wrong state\n", node->nd_ID);
1700 LEAVE(ENETUNREACH);
1701 }
1702 neg = sp->neg;
1703 /* If requested specific AC-name, check it. */
1704 if (neg->ac_name_len) {
1705 tag = get_tag(ph, PTT_AC_NAME);
1706 if (!tag) {
1707 /* No PTT_AC_NAME in PADO */
1708 break;
1709 }
1710 if (neg->ac_name_len != htons(tag->tag_len) ||
1711 strncmp(neg->ac_name.data,
1712 (const char *)(tag + 1),
1713 neg->ac_name_len) != 0) {
1714 break;
1715 }
1716 }
1717 sp->state = PPPOE_SREQ;
1718 ng_uncallout(&neg->handle, node);
1719
1720 /*
1721 * This is the first time we hear
1722 * from the server, so note it's
1723 * unicast address, replacing the
1724 * broadcast address .
1725 */
1726 bcopy(wh->eh.ether_shost,
1727 neg->pkt->pkt_header.eh.ether_dhost,
1728 ETHER_ADDR_LEN);
1729 neg->timeout = 0;
1730 neg->pkt->pkt_header.ph.code = PADR_CODE;
1731 init_tags(sp);
1732 insert_tag(sp, utag); /* Host Unique */
1733 if ((tag = get_tag(ph, PTT_AC_COOKIE)))
1734 insert_tag(sp, tag); /* return cookie */
1735 if ((tag = get_tag(ph, PTT_AC_NAME))) {
1736 insert_tag(sp, tag); /* return it */
1737 send_acname(sp, tag);
1738 }
1739 if ((tag = get_tag(ph, PTT_MAX_PAYL)) &&
1740 (privp->max_payload.data != 0))
1741 insert_tag(sp, tag); /* return it */
1742 insert_tag(sp, &neg->service.hdr); /* Service */
1743 scan_tags(sp, ph);
1744 make_packet(sp);
1745 sp->state = PPPOE_SREQ;
1746 ng_callout(&neg->handle, node, sp->hook,
1747 PPPOE_INITIAL_TIMEOUT * hz,
1748 pppoe_ticker, NULL, 0);
1749 neg->timeout = PPPOE_INITIAL_TIMEOUT * 2;
1750 m0 = m_copypacket(neg->m, M_NOWAIT);
1751 NG_FWD_NEW_DATA(error, item, privp->ethernet_hook, m0);
1752 break;
1753 case PADR_CODE:
1754 /*
1755 * We are a server:
1756 * Use the ac_cookie tag to find the
1757 * hook this is in response to.
1758 */
1759 utag = get_tag(ph, PTT_AC_COOKIE);
1760 if ((utag == NULL) ||
1761 (ntohs(utag->tag_len) != sizeof(sp))) {
1762 LEAVE(ENETUNREACH);
1763 }
1764
1765 sendhook = pppoe_findcookie(node, utag);
1766 if (sendhook == NULL)
1767 LEAVE(ENETUNREACH);
1768
1769 /*
1770 * Check the session is in the right state.
1771 * It needs to be in PPPOE_SOFFER or PPPOE_NEWCONNECTED.
1772 * If the latter, then this is a retry by the client,
1773 * so be nice, and resend.
1774 */
1775 sp = NG_HOOK_PRIVATE(sendhook);
1776 if (sp->state == PPPOE_NEWCONNECTED) {
1777 /*
1778 * Whoa! drop back to resend that PADS packet.
1779 * We should still have a copy of it.
1780 */
1781 sp->state = PPPOE_SOFFER;
1782 } else if (sp->state != PPPOE_SOFFER)
1783 LEAVE (ENETUNREACH);
1784 neg = sp->neg;
1785 ng_uncallout(&neg->handle, node);
1786 neg->pkt->pkt_header.ph.code = PADS_CODE;
1787 if (sp->Session_ID == 0) {
1788 neg->pkt->pkt_header.ph.sid =
1789 htons(pppoe_getnewsession(sp));
1790 }
1791 send_sessionid(sp);
1792 neg->timeout = 0;
1793 /*
1794 * start working out the tags to respond with.
1795 */
1796 init_tags(sp);
1797 insert_tag(sp, &neg->ac_name.hdr); /* AC_NAME */
1798 if ((tag = get_tag(ph, PTT_SRV_NAME)))
1799 insert_tag(sp, tag);/* return service */
1800 if ((tag = get_tag(ph, PTT_HOST_UNIQ)))
1801 insert_tag(sp, tag); /* return it */
1802 insert_tag(sp, utag); /* ac_cookie */
1803 scan_tags(sp, ph);
1804 make_packet(sp);
1805 sp->state = PPPOE_NEWCONNECTED;
1806
1807 /* Send the PADS without a timeout - we're now connected. */
1808 m0 = m_copypacket(sp->neg->m, M_NOWAIT);
1809 NG_FWD_NEW_DATA(error, item, privp->ethernet_hook, m0);
1810
1811 /*
1812 * Having sent the last Negotiation header,
1813 * Set up the stored packet header to be correct for
1814 * the actual session. But keep the negotialtion stuff
1815 * around in case we need to resend this last packet.
1816 * We'll discard it when we move from NEWCONNECTED
1817 * to CONNECTED
1818 */
1819 sp->pkt_hdr = neg->pkt->pkt_header;
1820 /* Configure ethertype depending on what
1821 * ethertype was used at discovery phase */
1822 if (sp->pkt_hdr.eh.ether_type ==
1823 ETHERTYPE_PPPOE_3COM_DISC)
1824 sp->pkt_hdr.eh.ether_type
1825 = ETHERTYPE_PPPOE_3COM_SESS;
1826 else
1827 sp->pkt_hdr.eh.ether_type
1828 = ETHERTYPE_PPPOE_SESS;
1829 sp->pkt_hdr.ph.code = 0;
1830 pppoe_send_event(sp, NGM_PPPOE_SUCCESS);
1831 break;
1832 case PADS_CODE:
1833 /*
1834 * We are a client:
1835 * Use the host_uniq tag to find the hook this is in
1836 * response to. Take the session ID and store it away.
1837 * Also make sure the pre-made header is correct and
1838 * set us into Session mode.
1839 */
1840 utag = get_tag(ph, PTT_HOST_UNIQ);
1841 if (utag == NULL) {
1842 LEAVE (ENETUNREACH);
1843 }
1844 sendhook = pppoe_finduniq(node, utag);
1845 if (sendhook == NULL)
1846 LEAVE(ENETUNREACH);
1847
1848 /*
1849 * Check the session is in the right state.
1850 * It needs to be in PPPOE_SREQ.
1851 */
1852 sp = NG_HOOK_PRIVATE(sendhook);
1853 if (sp->state != PPPOE_SREQ)
1854 LEAVE(ENETUNREACH);
1855 neg = sp->neg;
1856 ng_uncallout(&neg->handle, node);
1857 neg->pkt->pkt_header.ph.sid = wh->ph.sid;
1858 sp->Session_ID = ntohs(wh->ph.sid);
1859 pppoe_addsession(sp);
1860 send_sessionid(sp);
1861 neg->timeout = 0;
1862 sp->state = PPPOE_CONNECTED;
1863 /*
1864 * Now we have gone to Connected mode,
1865 * Free all resources needed for negotiation.
1866 * Keep a copy of the header we will be using.
1867 */
1868 sp->pkt_hdr = neg->pkt->pkt_header;
1869 if (privp->flags & COMPAT_3COM)
1870 sp->pkt_hdr.eh.ether_type
1871 = ETHERTYPE_PPPOE_3COM_SESS;
1872 else
1873 sp->pkt_hdr.eh.ether_type
1874 = ETHERTYPE_PPPOE_SESS;
1875 sp->pkt_hdr.ph.code = 0;
1876 m_freem(neg->m);
1877 free(sp->neg, M_NETGRAPH_PPPOE);
1878 sp->neg = NULL;
1879 if ((tag = get_tag(ph, PTT_MAX_PAYL)) &&
1880 (privp->max_payload.data != 0))
1881 send_maxp(sp, tag);
1882 pppoe_send_event(sp, NGM_PPPOE_SUCCESS);
1883 break;
1884 case PADT_CODE:
1885 /*
1886 * Find matching peer/session combination.
1887 */
1888 sp = pppoe_findsession(privp, wh);
1889 if (sp == NULL)
1890 LEAVE(ENETUNREACH);
1891 /* Disconnect that hook. */
1892 ng_rmhook_self(sp->hook);
1893 break;
1894 case PADM_CODE:
1895 /*
1896 * We are a client:
1897 * find matching peer/session combination.
1898 */
1899 sp = pppoe_findsession(privp, wh);
1900 if (sp == NULL)
1901 LEAVE (ENETUNREACH);
1902 if ((tag = get_tag(ph, PTT_HURL)))
1903 send_hurl(sp, tag);
1904 if ((tag = get_tag(ph, PTT_MOTM)))
1905 send_motm(sp, tag);
1906 break;
1907 default:
1908 LEAVE(EPFNOSUPPORT);
1909 }
1910 break;
1911 case ETHERTYPE_PPPOE_3COM_SESS:
1912 case ETHERTYPE_PPPOE_SESS:
1913 /*
1914 * Find matching peer/session combination.
1915 */
1916 sp = pppoe_findsession(privp, wh);
1917 if (sp == NULL)
1918 LEAVE (ENETUNREACH);
1919 m_adj(m, sizeof(*wh));
1920
1921 /* If packet too short, dump it. */
1922 if (m->m_pkthdr.len < length)
1923 LEAVE(EMSGSIZE);
1924 /* Also need to trim excess at the end */
1925 if (m->m_pkthdr.len > length) {
1926 m_adj(m, -((int)(m->m_pkthdr.len - length)));
1927 }
1928 if ( sp->state != PPPOE_CONNECTED) {
1929 if (sp->state == PPPOE_NEWCONNECTED) {
1930 sp->state = PPPOE_CONNECTED;
1931 /*
1932 * Now we have gone to Connected mode,
1933 * Free all resources needed for negotiation.
1934 * Be paranoid about whether there may be
1935 * a timeout.
1936 */
1937 m_freem(sp->neg->m);
1938 ng_uncallout(&sp->neg->handle, node);
1939 free(sp->neg, M_NETGRAPH_PPPOE);
1940 sp->neg = NULL;
1941 } else {
1942 LEAVE (ENETUNREACH);
1943 }
1944 }
1945 NG_FWD_NEW_DATA(error, item, sp->hook, m);
1946 break;
1947 default:
1948 LEAVE(EPFNOSUPPORT);
1949 }
1950 quit:
1951 if (item)
1952 NG_FREE_ITEM(item);
1953 NG_FREE_M(m);
1954 return (error);
1955 }
1956
1957 /*
1958 * Receive data from debug hook and bypass it to ether.
1959 */
1960 static int
1961 ng_pppoe_rcvdata_debug(hook_p hook, item_p item)
1962 {
1963 node_p node = NG_HOOK_NODE(hook);
1964 const priv_p privp = NG_NODE_PRIVATE(node);
1965 int error;
1966
1967 CTR6(KTR_NET, "%20s: node [%x] (%p) received %p on \"%s\" (%p)",
1968 __func__, node->nd_ID, node, item, hook->hk_name, hook);
1969
1970 NG_FWD_ITEM_HOOK(error, item, privp->ethernet_hook);
1971 privp->packets_out++;
1972 return (error);
1973 }
1974
1975 /*
1976 * Do local shutdown processing..
1977 * If we are a persistant device, we might refuse to go away, and
1978 * we'd only remove our links and reset ourself.
1979 */
1980 static int
1981 ng_pppoe_shutdown(node_p node)
1982 {
1983 const priv_p privp = NG_NODE_PRIVATE(node);
1984 int i;
1985
1986 for (i = 0; i < SESSHASHSIZE; i++)
1987 mtx_destroy(&privp->sesshash[i].mtx);
1988 NG_NODE_SET_PRIVATE(node, NULL);
1989 NG_NODE_UNREF(privp->node);
1990 free(privp, M_NETGRAPH_PPPOE);
1991 return (0);
1992 }
1993
1994 /*
1995 * Hook disconnection
1996 *
1997 * Clean up all dangling links and information about the session/hook.
1998 * For this type, removal of the last link destroys the node.
1999 */
2000 static int
2001 ng_pppoe_disconnect(hook_p hook)
2002 {
2003 node_p node = NG_HOOK_NODE(hook);
2004 priv_p privp = NG_NODE_PRIVATE(node);
2005 sessp sp;
2006
2007 if (hook == privp->debug_hook) {
2008 privp->debug_hook = NULL;
2009 } else if (hook == privp->ethernet_hook) {
2010 privp->ethernet_hook = NULL;
2011 if (NG_NODE_IS_VALID(node))
2012 ng_rmnode_self(node);
2013 } else {
2014 sp = NG_HOOK_PRIVATE(hook);
2015 if (sp->state != PPPOE_SNONE ) {
2016 pppoe_send_event(sp, NGM_PPPOE_CLOSE);
2017 }
2018 /*
2019 * According to the spec, if we are connected,
2020 * we should send a DISC packet if we are shutting down
2021 * a session.
2022 */
2023 if ((privp->ethernet_hook)
2024 && ((sp->state == PPPOE_CONNECTED)
2025 || (sp->state == PPPOE_NEWCONNECTED))) {
2026 struct mbuf *m;
2027
2028 /* Generate a packet of that type. */
2029 m = m_gethdr(M_NOWAIT, MT_DATA);
2030 if (m == NULL)
2031 log(LOG_NOTICE, "ng_pppoe[%x]: session out of "
2032 "mbufs\n", node->nd_ID);
2033 else {
2034 struct pppoe_full_hdr *wh;
2035 struct pppoe_tag *tag;
2036 int msglen = strlen(SIGNOFF);
2037 int error = 0;
2038
2039 wh = mtod(m, struct pppoe_full_hdr *);
2040 bcopy(&sp->pkt_hdr, wh, sizeof(*wh));
2041
2042 /* Revert the stored header to DISC/PADT mode. */
2043 wh->ph.code = PADT_CODE;
2044 /*
2045 * Configure ethertype depending on what
2046 * was used during sessions stage.
2047 */
2048 if (wh->eh.ether_type ==
2049 ETHERTYPE_PPPOE_3COM_SESS)
2050 wh->eh.ether_type = ETHERTYPE_PPPOE_3COM_DISC;
2051 else
2052 wh->eh.ether_type = ETHERTYPE_PPPOE_DISC;
2053 /*
2054 * Add a General error message and adjust
2055 * sizes.
2056 */
2057 tag = (void *)(&wh->ph + 1);
2058 tag->tag_type = PTT_GEN_ERR;
2059 tag->tag_len = htons((u_int16_t)msglen);
2060 strncpy((char *)(tag + 1), SIGNOFF, msglen);
2061 m->m_pkthdr.len = m->m_len = sizeof(*wh) + sizeof(*tag) +
2062 msglen;
2063 wh->ph.length = htons(sizeof(*tag) + msglen);
2064 NG_SEND_DATA_ONLY(error,
2065 privp->ethernet_hook, m);
2066 }
2067 }
2068 if (sp->state == PPPOE_LISTENING)
2069 LIST_REMOVE(sp, sessions);
2070 else if (sp->Session_ID)
2071 pppoe_delsession(sp);
2072 /*
2073 * As long as we have somewhere to store the timeout handle,
2074 * we may have a timeout pending.. get rid of it.
2075 */
2076 if (sp->neg) {
2077 ng_uncallout(&sp->neg->handle, node);
2078 if (sp->neg->m)
2079 m_freem(sp->neg->m);
2080 free(sp->neg, M_NETGRAPH_PPPOE);
2081 }
2082 free(sp, M_NETGRAPH_PPPOE);
2083 NG_HOOK_SET_PRIVATE(hook, NULL);
2084 }
2085 if ((NG_NODE_NUMHOOKS(node) == 0) &&
2086 (NG_NODE_IS_VALID(node)))
2087 ng_rmnode_self(node);
2088 return (0);
2089 }
2090
2091 /*
2092 * Timeouts come here.
2093 */
2094 static void
2095 pppoe_ticker(node_p node, hook_p hook, void *arg1, int arg2)
2096 {
2097 priv_p privp = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
2098 sessp sp = NG_HOOK_PRIVATE(hook);
2099 negp neg = sp->neg;
2100 struct mbuf *m0 = NULL;
2101 int error = 0;
2102
2103 CTR6(KTR_NET, "%20s: node [%x] (%p) hook \"%s\" (%p) session %d",
2104 __func__, node->nd_ID, node, hook->hk_name, hook, sp->Session_ID);
2105 switch(sp->state) {
2106 /*
2107 * Resend the last packet, using an exponential backoff.
2108 * After a period of time, stop growing the backoff,
2109 * And either leave it, or revert to the start.
2110 */
2111 case PPPOE_SINIT:
2112 case PPPOE_SREQ:
2113 /* Timeouts on these produce resends. */
2114 m0 = m_copypacket(sp->neg->m, M_NOWAIT);
2115 NG_SEND_DATA_ONLY( error, privp->ethernet_hook, m0);
2116 ng_callout(&neg->handle, node, hook, neg->timeout * hz,
2117 pppoe_ticker, NULL, 0);
2118 if ((neg->timeout <<= 1) > PPPOE_TIMEOUT_LIMIT) {
2119 if (sp->state == PPPOE_SREQ) {
2120 /* Revert to SINIT mode. */
2121 pppoe_start(sp);
2122 } else {
2123 neg->timeout = PPPOE_TIMEOUT_LIMIT;
2124 }
2125 }
2126 break;
2127 case PPPOE_PRIMED:
2128 case PPPOE_SOFFER:
2129 /* A timeout on these says "give up" */
2130 ng_rmhook_self(hook);
2131 break;
2132 default:
2133 /* Timeouts have no meaning in other states. */
2134 log(LOG_NOTICE, "ng_pppoe[%x]: unexpected timeout\n",
2135 node->nd_ID);
2136 }
2137 }
2138
2139 /*
2140 * Parse an incoming packet to see if any tags should be copied to the
2141 * output packet. Don't do any tags that have been handled in the main
2142 * state machine.
2143 */
2144 static const struct pppoe_tag*
2145 scan_tags(sessp sp, const struct pppoe_hdr* ph)
2146 {
2147 const char *const end = (const char *)next_tag(ph);
2148 const char *ptn;
2149 const struct pppoe_tag *pt = (const void *)(ph + 1);
2150
2151 /*
2152 * Keep processing tags while a tag header will still fit.
2153 */
2154 CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID);
2155
2156 while((const char*)(pt + 1) <= end) {
2157 /*
2158 * If the tag data would go past the end of the packet, abort.
2159 */
2160 ptn = (((const char *)(pt + 1)) + ntohs(pt->tag_len));
2161 if(ptn > end)
2162 return NULL;
2163
2164 switch (pt->tag_type) {
2165 case PTT_RELAY_SID:
2166 insert_tag(sp, pt);
2167 break;
2168 case PTT_EOL:
2169 return NULL;
2170 case PTT_SRV_NAME:
2171 case PTT_AC_NAME:
2172 case PTT_HOST_UNIQ:
2173 case PTT_AC_COOKIE:
2174 case PTT_VENDOR:
2175 case PTT_SRV_ERR:
2176 case PTT_SYS_ERR:
2177 case PTT_GEN_ERR:
2178 case PTT_MAX_PAYL:
2179 case PTT_HURL:
2180 case PTT_MOTM:
2181 break;
2182 }
2183 pt = (const struct pppoe_tag*)ptn;
2184 }
2185 return NULL;
2186 }
2187
2188 static int
2189 pppoe_send_event(sessp sp, enum cmd cmdid)
2190 {
2191 int error;
2192 struct ng_mesg *msg;
2193 struct ngpppoe_sts *sts;
2194
2195 CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID);
2196
2197 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, cmdid,
2198 sizeof(struct ngpppoe_sts), M_NOWAIT);
2199 if (msg == NULL)
2200 return (ENOMEM);
2201 sts = (struct ngpppoe_sts *)msg->data;
2202 strncpy(sts->hook, NG_HOOK_NAME(sp->hook), NG_HOOKSIZ);
2203 NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0);
2204 return (error);
2205 }
Cache object: 9238b397dc5884f530fcb6b3d2734a22
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