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 { 0 }
179 };
180
181 /* Netgraph node type descriptor */
182 static struct ng_type typestruct = {
183 .version = NG_ABI_VERSION,
184 .name = NG_PPPOE_NODE_TYPE,
185 .constructor = ng_pppoe_constructor,
186 .rcvmsg = ng_pppoe_rcvmsg,
187 .shutdown = ng_pppoe_shutdown,
188 .newhook = ng_pppoe_newhook,
189 .connect = ng_pppoe_connect,
190 .rcvdata = ng_pppoe_rcvdata,
191 .disconnect = ng_pppoe_disconnect,
192 .cmdlist = ng_pppoe_cmds,
193 };
194 NETGRAPH_INIT(pppoe, &typestruct);
195
196 /*
197 * States for the session state machine.
198 * These have no meaning if there is no hook attached yet.
199 */
200 enum state {
201 PPPOE_SNONE=0, /* [both] Initial state */
202 PPPOE_LISTENING, /* [Daemon] Listening for discover initiation pkt */
203 PPPOE_SINIT, /* [Client] Sent discovery initiation */
204 PPPOE_PRIMED, /* [Server] Awaiting PADI from daemon */
205 PPPOE_SOFFER, /* [Server] Sent offer message (got PADI)*/
206 PPPOE_SREQ, /* [Client] Sent a Request */
207 PPPOE_NEWCONNECTED, /* [Server] Connection established, No data received */
208 PPPOE_CONNECTED, /* [Both] Connection established, Data received */
209 PPPOE_DEAD /* [Both] */
210 };
211
212 #define NUMTAGS 20 /* number of tags we are set up to work with */
213
214 /*
215 * Information we store for each hook on each node for negotiating the
216 * session. The mbuf and cluster are freed once negotiation has completed.
217 * The whole negotiation block is then discarded.
218 */
219
220 struct sess_neg {
221 struct mbuf *m; /* holds cluster with last sent packet */
222 union packet *pkt; /* points within the above cluster */
223 struct callout handle; /* see timeout(9) */
224 u_int timeout; /* 0,1,2,4,8,16 etc. seconds */
225 u_int numtags;
226 const struct pppoe_tag *tags[NUMTAGS];
227 u_int service_len;
228 u_int ac_name_len;
229
230 struct datatag service;
231 struct datatag ac_name;
232 };
233 typedef struct sess_neg *negp;
234
235 /*
236 * Session information that is needed after connection.
237 */
238 struct sess_con {
239 hook_p hook;
240 uint16_t Session_ID;
241 enum state state;
242 ng_ID_t creator; /* who to notify */
243 struct pppoe_full_hdr pkt_hdr; /* used when connected */
244 negp neg; /* used when negotiating */
245 LIST_ENTRY(sess_con) sessions;
246 };
247 typedef struct sess_con *sessp;
248
249 #define SESSHASHSIZE 0x0100
250 #define SESSHASH(x) (((x) ^ ((x) >> 8)) & (SESSHASHSIZE - 1))
251
252 struct sess_hash_entry {
253 struct mtx mtx;
254 LIST_HEAD(hhead, sess_con) head;
255 };
256
257 /*
258 * Information we store for each node
259 */
260 struct PPPoE {
261 node_p node; /* back pointer to node */
262 hook_p ethernet_hook;
263 hook_p debug_hook;
264 u_int packets_in; /* packets in from ethernet */
265 u_int packets_out; /* packets out towards ethernet */
266 uint32_t flags;
267 #define COMPAT_3COM 0x00000001
268 #define COMPAT_DLINK 0x00000002
269 struct ether_header eh;
270 LIST_HEAD(, sess_con) listeners;
271 struct sess_hash_entry sesshash[SESSHASHSIZE];
272 struct maxptag max_payload; /* PPP-Max-Payload (RFC4638) */
273 };
274 typedef struct PPPoE *priv_p;
275
276 union uniq {
277 char bytes[sizeof(void *)];
278 void *pointer;
279 };
280
281 #define LEAVE(x) do { error = x; goto quit; } while(0)
282 static void pppoe_start(sessp sp);
283 static void pppoe_ticker(node_p node, hook_p hook, void *arg1, int arg2);
284 static const struct pppoe_tag *scan_tags(sessp sp,
285 const struct pppoe_hdr* ph);
286 static int pppoe_send_event(sessp sp, enum cmd cmdid);
287
288 /*************************************************************************
289 * Some basic utilities from the Linux version with author's permission.*
290 * Author: Michal Ostrowski <mostrows@styx.uwaterloo.ca> *
291 ************************************************************************/
292
293
294
295 /*
296 * Return the location where the next tag can be put
297 */
298 static __inline const struct pppoe_tag*
299 next_tag(const struct pppoe_hdr* ph)
300 {
301 return (const struct pppoe_tag*)(((const char*)(ph + 1))
302 + ntohs(ph->length));
303 }
304
305 /*
306 * Look for a tag of a specific type.
307 * Don't trust any length the other end says,
308 * but assume we already sanity checked ph->length.
309 */
310 static const struct pppoe_tag*
311 get_tag(const struct pppoe_hdr* ph, uint16_t idx)
312 {
313 const char *const end = (const char *)next_tag(ph);
314 const struct pppoe_tag *pt = (const void *)(ph + 1);
315 const char *ptn;
316
317 /*
318 * Keep processing tags while a tag header will still fit.
319 */
320 while((const char*)(pt + 1) <= end) {
321 /*
322 * If the tag data would go past the end of the packet, abort.
323 */
324 ptn = (((const char *)(pt + 1)) + ntohs(pt->tag_len));
325 if (ptn > end) {
326 CTR2(KTR_NET, "%20s: invalid length for tag %d",
327 __func__, idx);
328 return (NULL);
329 }
330 if (pt->tag_type == idx) {
331 CTR2(KTR_NET, "%20s: found tag %d", __func__, idx);
332 return (pt);
333 }
334
335 pt = (const struct pppoe_tag*)ptn;
336 }
337
338 CTR2(KTR_NET, "%20s: not found tag %d", __func__, idx);
339 return (NULL);
340 }
341
342 /**************************************************************************
343 * Inlines to initialise or add tags to a session's tag list.
344 **************************************************************************/
345 /*
346 * Initialise the session's tag list.
347 */
348 static void
349 init_tags(sessp sp)
350 {
351 KASSERT(sp->neg != NULL, ("%s: no neg", __func__));
352 sp->neg->numtags = 0;
353 }
354
355 static void
356 insert_tag(sessp sp, const struct pppoe_tag *tp)
357 {
358 negp neg = sp->neg;
359 int i;
360
361 KASSERT(neg != NULL, ("%s: no neg", __func__));
362 if ((i = neg->numtags++) < NUMTAGS) {
363 neg->tags[i] = tp;
364 } else {
365 log(LOG_NOTICE, "ng_pppoe: asked to add too many tags to "
366 "packet\n");
367 neg->numtags--;
368 }
369 }
370
371 /*
372 * Make up a packet, using the tags filled out for the session.
373 *
374 * Assume that the actual pppoe header and ethernet header
375 * are filled out externally to this routine.
376 * Also assume that neg->wh points to the correct
377 * location at the front of the buffer space.
378 */
379 static void
380 make_packet(sessp sp) {
381 struct pppoe_full_hdr *wh = &sp->neg->pkt->pkt_header;
382 const struct pppoe_tag **tag;
383 char *dp;
384 int count;
385 int tlen;
386 uint16_t length = 0;
387
388 KASSERT((sp->neg != NULL) && (sp->neg->m != NULL),
389 ("%s: called from wrong state", __func__));
390 CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID);
391
392 dp = (char *)(&wh->ph + 1);
393 for (count = 0, tag = sp->neg->tags;
394 ((count < sp->neg->numtags) && (count < NUMTAGS));
395 tag++, count++) {
396 tlen = ntohs((*tag)->tag_len) + sizeof(**tag);
397 if ((length + tlen) > (ETHER_MAX_LEN - 4 - sizeof(*wh))) {
398 log(LOG_NOTICE, "ng_pppoe: tags too long\n");
399 sp->neg->numtags = count;
400 break; /* XXX chop off what's too long */
401 }
402 bcopy(*tag, (char *)dp, tlen);
403 length += tlen;
404 dp += tlen;
405 }
406 wh->ph.length = htons(length);
407 sp->neg->m->m_len = length + sizeof(*wh);
408 sp->neg->m->m_pkthdr.len = length + sizeof(*wh);
409 }
410
411 /**************************************************************************
412 * Routines to match a service. *
413 **************************************************************************/
414
415 /*
416 * Find a hook that has a service string that matches that
417 * we are seeking. For now use a simple string.
418 * In the future we may need something like regexp().
419 *
420 * Null string is a wildcard (ANY service), according to RFC2516.
421 * And historical FreeBSD wildcard is also "*".
422 */
423
424 static hook_p
425 pppoe_match_svc(node_p node, const struct pppoe_tag *tag)
426 {
427 const priv_p privp = NG_NODE_PRIVATE(node);
428 sessp sp;
429
430 LIST_FOREACH(sp, &privp->listeners, sessions) {
431 negp neg = sp->neg;
432
433 /* Empty Service-Name matches any service. */
434 if (neg->service_len == 0)
435 break;
436
437 /* Special case for a blank or "*" service name (wildcard). */
438 if (neg->service_len == 1 && neg->service.data[0] == '*')
439 break;
440
441 /* If the lengths don't match, that aint it. */
442 if (neg->service_len != ntohs(tag->tag_len))
443 continue;
444
445 if (strncmp((const char *)(tag + 1), neg->service.data,
446 ntohs(tag->tag_len)) == 0)
447 break;
448 }
449 CTR3(KTR_NET, "%20s: matched %p for %s", __func__,
450 sp?sp->hook:NULL, (const char *)(tag + 1));
451
452 return (sp?sp->hook:NULL);
453 }
454
455 /*
456 * Broadcast the PADI packet in m0 to all listening hooks.
457 * This routine is called when a PADI with empty Service-Name
458 * tag is received. Client should receive PADOs with all
459 * available services.
460 */
461 static int
462 pppoe_broadcast_padi(node_p node, struct mbuf *m0)
463 {
464 const priv_p privp = NG_NODE_PRIVATE(node);
465 sessp sp;
466 int error = 0;
467
468 LIST_FOREACH(sp, &privp->listeners, sessions) {
469 struct mbuf *m;
470
471 m = m_dup(m0, M_DONTWAIT);
472 if (m == NULL)
473 return (ENOMEM);
474 NG_SEND_DATA_ONLY(error, sp->hook, m);
475 if (error)
476 return (error);
477 }
478
479 return (0);
480 }
481
482 /*
483 * Find a hook, which name equals to given service.
484 */
485 static hook_p
486 pppoe_find_svc(node_p node, const char *svc_name, int svc_len)
487 {
488 const priv_p privp = NG_NODE_PRIVATE(node);
489 sessp sp;
490
491 LIST_FOREACH(sp, &privp->listeners, sessions) {
492 negp neg = sp->neg;
493
494 if (neg->service_len == svc_len &&
495 strncmp(svc_name, neg->service.data, svc_len) == 0)
496 return (sp->hook);
497 }
498
499 return (NULL);
500 }
501
502 /**************************************************************************
503 * Routines to find a particular session that matches an incoming packet. *
504 **************************************************************************/
505 /* Find free session and add to hash. */
506 static uint16_t
507 pppoe_getnewsession(sessp sp)
508 {
509 const priv_p privp = NG_NODE_PRIVATE(NG_HOOK_NODE(sp->hook));
510 static uint16_t pppoe_sid = 1;
511 sessp tsp;
512 uint16_t val, hash;
513
514 restart:
515 /* Atomicity is not needed here as value will be checked. */
516 val = pppoe_sid++;
517 /* Spec says 0xFFFF is reserved, also don't use 0x0000. */
518 if (val == 0xffff || val == 0x0000)
519 val = pppoe_sid = 1;
520
521 /* Check it isn't already in use. */
522 hash = SESSHASH(val);
523 mtx_lock(&privp->sesshash[hash].mtx);
524 LIST_FOREACH(tsp, &privp->sesshash[hash].head, sessions) {
525 if (tsp->Session_ID == val)
526 break;
527 }
528 if (!tsp) {
529 sp->Session_ID = val;
530 LIST_INSERT_HEAD(&privp->sesshash[hash].head, sp, sessions);
531 }
532 mtx_unlock(&privp->sesshash[hash].mtx);
533 if (tsp)
534 goto restart;
535
536 CTR2(KTR_NET, "%20s: new sid %d", __func__, val);
537
538 return (val);
539 }
540
541 /* Add specified session to hash. */
542 static void
543 pppoe_addsession(sessp sp)
544 {
545 const priv_p privp = NG_NODE_PRIVATE(NG_HOOK_NODE(sp->hook));
546 uint16_t hash = SESSHASH(sp->Session_ID);
547
548 mtx_lock(&privp->sesshash[hash].mtx);
549 LIST_INSERT_HEAD(&privp->sesshash[hash].head, sp, sessions);
550 mtx_unlock(&privp->sesshash[hash].mtx);
551 }
552
553 /* Delete specified session from hash. */
554 static void
555 pppoe_delsession(sessp sp)
556 {
557 const priv_p privp = NG_NODE_PRIVATE(NG_HOOK_NODE(sp->hook));
558 uint16_t hash = SESSHASH(sp->Session_ID);
559
560 mtx_lock(&privp->sesshash[hash].mtx);
561 LIST_REMOVE(sp, sessions);
562 mtx_unlock(&privp->sesshash[hash].mtx);
563 }
564
565 /* Find matching peer/session combination. */
566 static sessp
567 pppoe_findsession(priv_p privp, const struct pppoe_full_hdr *wh)
568 {
569 uint16_t session = ntohs(wh->ph.sid);
570 uint16_t hash = SESSHASH(session);
571 sessp sp = NULL;
572
573 mtx_lock(&privp->sesshash[hash].mtx);
574 LIST_FOREACH(sp, &privp->sesshash[hash].head, sessions) {
575 if (sp->Session_ID == session &&
576 bcmp(sp->pkt_hdr.eh.ether_dhost,
577 wh->eh.ether_shost, ETHER_ADDR_LEN) == 0) {
578 break;
579 }
580 }
581 mtx_unlock(&privp->sesshash[hash].mtx);
582 CTR3(KTR_NET, "%20s: matched %p for %d", __func__, sp?sp->hook:NULL,
583 session);
584
585 return (sp);
586 }
587
588 static hook_p
589 pppoe_finduniq(node_p node, const struct pppoe_tag *tag)
590 {
591 hook_p hook = NULL;
592 union uniq uniq;
593
594 bcopy(tag + 1, uniq.bytes, sizeof(void *));
595 /* Cycle through all known hooks. */
596 LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) {
597 /* Skip any nonsession hook. */
598 if (NG_HOOK_PRIVATE(hook) == NULL)
599 continue;
600 if (uniq.pointer == NG_HOOK_PRIVATE(hook))
601 break;
602 }
603 CTR3(KTR_NET, "%20s: matched %p for %p", __func__, hook, uniq.pointer);
604
605 return (hook);
606 }
607
608 /**************************************************************************
609 * Start of Netgraph entrypoints. *
610 **************************************************************************/
611
612 /*
613 * Allocate the private data structure and link it with node.
614 */
615 static int
616 ng_pppoe_constructor(node_p node)
617 {
618 priv_p privp;
619 int i;
620
621 /* Initialize private descriptor. */
622 privp = malloc(sizeof(*privp), M_NETGRAPH_PPPOE, M_WAITOK | M_ZERO);
623
624 /* Link structs together; this counts as our one reference to *node. */
625 NG_NODE_SET_PRIVATE(node, privp);
626 privp->node = node;
627
628 /* Initialize to standard mode. */
629 memset(&privp->eh.ether_dhost, 0xff, ETHER_ADDR_LEN);
630 privp->eh.ether_type = ETHERTYPE_PPPOE_DISC;
631
632 LIST_INIT(&privp->listeners);
633 for (i = 0; i < SESSHASHSIZE; i++) {
634 mtx_init(&privp->sesshash[i].mtx, "PPPoE hash mutex", NULL, MTX_DEF);
635 LIST_INIT(&privp->sesshash[i].head);
636 }
637
638 CTR3(KTR_NET, "%20s: created node [%x] (%p)",
639 __func__, node->nd_ID, node);
640
641 return (0);
642 }
643
644 /*
645 * Give our ok for a hook to be added...
646 * point the hook's private info to the hook structure.
647 *
648 * The following hook names are special:
649 * "ethernet": the hook that should be connected to a NIC.
650 * "debug": copies of data sent out here (when I write the code).
651 * All other hook names need only be unique. (the framework checks this).
652 */
653 static int
654 ng_pppoe_newhook(node_p node, hook_p hook, const char *name)
655 {
656 const priv_p privp = NG_NODE_PRIVATE(node);
657 sessp sp;
658
659 if (strcmp(name, NG_PPPOE_HOOK_ETHERNET) == 0) {
660 privp->ethernet_hook = hook;
661 NG_HOOK_SET_RCVDATA(hook, ng_pppoe_rcvdata_ether);
662 } else if (strcmp(name, NG_PPPOE_HOOK_DEBUG) == 0) {
663 privp->debug_hook = hook;
664 NG_HOOK_SET_RCVDATA(hook, ng_pppoe_rcvdata_debug);
665 } else {
666 /*
667 * Any other unique name is OK.
668 * The infrastructure has already checked that it's unique,
669 * so just allocate it and hook it in.
670 */
671 sp = malloc(sizeof(*sp), M_NETGRAPH_PPPOE, M_NOWAIT | M_ZERO);
672 if (sp == NULL)
673 return (ENOMEM);
674
675 NG_HOOK_SET_PRIVATE(hook, sp);
676 sp->hook = hook;
677 }
678 CTR5(KTR_NET, "%20s: node [%x] (%p) connected hook %s (%p)",
679 __func__, node->nd_ID, node, name, hook);
680
681 return(0);
682 }
683
684 /*
685 * Hook has been added successfully. Request the MAC address of
686 * the underlying Ethernet node.
687 */
688 static int
689 ng_pppoe_connect(hook_p hook)
690 {
691 const priv_p privp = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
692 struct ng_mesg *msg;
693 int error;
694
695 if (hook != privp->ethernet_hook)
696 return (0);
697
698 /*
699 * If this is Ethernet hook, then request MAC address
700 * from our downstream.
701 */
702 NG_MKMESSAGE(msg, NGM_ETHER_COOKIE, NGM_ETHER_GET_ENADDR, 0, M_NOWAIT);
703 if (msg == NULL)
704 return (ENOBUFS);
705
706 /*
707 * Our hook and peer hook have HK_INVALID flag set,
708 * so we can't use NG_SEND_MSG_HOOK() macro here.
709 */
710 NG_SEND_MSG_ID(error, privp->node, msg,
711 NG_NODE_ID(NG_PEER_NODE(privp->ethernet_hook)),
712 NG_NODE_ID(privp->node));
713
714 return (error);
715 }
716 /*
717 * Get a netgraph control message.
718 * Check it is one we understand. If needed, send a response.
719 * We sometimes save the address for an async action later.
720 * Always free the message.
721 */
722 static int
723 ng_pppoe_rcvmsg(node_p node, item_p item, hook_p lasthook)
724 {
725 priv_p privp = NG_NODE_PRIVATE(node);
726 struct ngpppoe_init_data *ourmsg = NULL;
727 struct ng_mesg *resp = NULL;
728 int error = 0;
729 hook_p hook = NULL;
730 sessp sp = NULL;
731 negp neg = NULL;
732 struct ng_mesg *msg;
733
734 NGI_GET_MSG(item, msg);
735 CTR5(KTR_NET, "%20s: node [%x] (%p) got message %d with cookie %d",
736 __func__, node->nd_ID, node, msg->header.cmd,
737 msg->header.typecookie);
738
739 /* Deal with message according to cookie and command. */
740 switch (msg->header.typecookie) {
741 case NGM_PPPOE_COOKIE:
742 switch (msg->header.cmd) {
743 case NGM_PPPOE_CONNECT:
744 case NGM_PPPOE_LISTEN:
745 case NGM_PPPOE_OFFER:
746 case NGM_PPPOE_SERVICE:
747 ourmsg = (struct ngpppoe_init_data *)msg->data;
748 if (msg->header.arglen < sizeof(*ourmsg)) {
749 log(LOG_ERR, "ng_pppoe[%x]: init data too "
750 "small\n", node->nd_ID);
751 LEAVE(EMSGSIZE);
752 }
753 if (msg->header.arglen - sizeof(*ourmsg) >
754 PPPOE_SERVICE_NAME_SIZE) {
755 log(LOG_ERR, "ng_pppoe[%x]: service name "
756 "too big\n", node->nd_ID);
757 LEAVE(EMSGSIZE);
758 }
759 if (msg->header.arglen - sizeof(*ourmsg) <
760 ourmsg->data_len) {
761 log(LOG_ERR, "ng_pppoe[%x]: init data has bad "
762 "length, %d should be %zd\n", node->nd_ID,
763 ourmsg->data_len,
764 msg->header.arglen - sizeof (*ourmsg));
765 LEAVE(EMSGSIZE);
766 }
767
768 /* Make sure strcmp will terminate safely. */
769 ourmsg->hook[sizeof(ourmsg->hook) - 1] = '\0';
770
771 /* Find hook by name. */
772 hook = ng_findhook(node, ourmsg->hook);
773 if (hook == NULL)
774 LEAVE(ENOENT);
775
776 sp = NG_HOOK_PRIVATE(hook);
777 if (sp == NULL)
778 LEAVE(EINVAL);
779
780 if (msg->header.cmd == NGM_PPPOE_LISTEN) {
781 /*
782 * Ensure we aren't already listening for this
783 * service.
784 */
785 if (pppoe_find_svc(node, ourmsg->data,
786 ourmsg->data_len) != NULL)
787 LEAVE(EEXIST);
788 }
789
790 /*
791 * PPPOE_SERVICE advertisments are set up
792 * on sessions that are in PRIMED state.
793 */
794 if (msg->header.cmd == NGM_PPPOE_SERVICE)
795 break;
796
797 if (sp->state != PPPOE_SNONE) {
798 log(LOG_NOTICE, "ng_pppoe[%x]: Session already "
799 "active\n", node->nd_ID);
800 LEAVE(EISCONN);
801 }
802
803 /*
804 * Set up prototype header.
805 */
806 neg = malloc(sizeof(*neg), M_NETGRAPH_PPPOE,
807 M_NOWAIT | M_ZERO);
808
809 if (neg == NULL)
810 LEAVE(ENOMEM);
811
812 neg->m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
813 if (neg->m == NULL) {
814 free(neg, M_NETGRAPH_PPPOE);
815 LEAVE(ENOBUFS);
816 }
817 neg->m->m_pkthdr.rcvif = NULL;
818 sp->neg = neg;
819 ng_callout_init(&neg->handle);
820 neg->m->m_len = sizeof(struct pppoe_full_hdr);
821 neg->pkt = mtod(neg->m, union packet*);
822 memcpy((void *)&neg->pkt->pkt_header.eh,
823 &privp->eh, sizeof(struct ether_header));
824 neg->pkt->pkt_header.ph.ver = 0x1;
825 neg->pkt->pkt_header.ph.type = 0x1;
826 neg->pkt->pkt_header.ph.sid = 0x0000;
827 neg->timeout = 0;
828
829 sp->creator = NGI_RETADDR(item);
830 }
831 switch (msg->header.cmd) {
832 case NGM_PPPOE_GET_STATUS:
833 {
834 struct ngpppoestat *stats;
835
836 NG_MKRESPONSE(resp, msg, sizeof(*stats), M_NOWAIT);
837 if (!resp)
838 LEAVE(ENOMEM);
839
840 stats = (struct ngpppoestat *) resp->data;
841 stats->packets_in = privp->packets_in;
842 stats->packets_out = privp->packets_out;
843 break;
844 }
845 case NGM_PPPOE_CONNECT:
846 {
847 /*
848 * Check the hook exists and is Uninitialised.
849 * Send a PADI request, and start the timeout logic.
850 * Store the originator of this message so we can send
851 * a success of fail message to them later.
852 * Move the session to SINIT.
853 * Set up the session to the correct state and
854 * start it.
855 */
856 int i, acnlen = 0, acnsep = 0, srvlen;
857 for (i = 0; i < ourmsg->data_len; i++) {
858 if (ourmsg->data[i] == '\\') {
859 acnlen = i;
860 acnsep = 1;
861 break;
862 }
863 }
864 srvlen = ourmsg->data_len - acnlen - acnsep;
865
866 bcopy(ourmsg->data, neg->ac_name.data, acnlen);
867 neg->ac_name_len = acnlen;
868
869 neg->service.hdr.tag_type = PTT_SRV_NAME;
870 neg->service.hdr.tag_len = htons((uint16_t)srvlen);
871 bcopy(ourmsg->data + acnlen + acnsep,
872 neg->service.data, srvlen);
873 neg->service_len = srvlen;
874 pppoe_start(sp);
875 break;
876 }
877 case NGM_PPPOE_LISTEN:
878 /*
879 * Check the hook exists and is Uninitialised.
880 * Install the service matching string.
881 * Store the originator of this message so we can send
882 * a success of fail message to them later.
883 * Move the hook to 'LISTENING'
884 */
885 neg->service.hdr.tag_type = PTT_SRV_NAME;
886 neg->service.hdr.tag_len =
887 htons((uint16_t)ourmsg->data_len);
888
889 if (ourmsg->data_len)
890 bcopy(ourmsg->data, neg->service.data,
891 ourmsg->data_len);
892 neg->service_len = ourmsg->data_len;
893 neg->pkt->pkt_header.ph.code = PADT_CODE;
894 /*
895 * Wait for PADI packet coming from Ethernet.
896 */
897 sp->state = PPPOE_LISTENING;
898 LIST_INSERT_HEAD(&privp->listeners, sp, sessions);
899 break;
900 case NGM_PPPOE_OFFER:
901 /*
902 * Check the hook exists and is Uninitialised.
903 * Store the originator of this message so we can send
904 * a success of fail message to them later.
905 * Store the AC-Name given and go to PRIMED.
906 */
907 neg->ac_name.hdr.tag_type = PTT_AC_NAME;
908 neg->ac_name.hdr.tag_len =
909 htons((uint16_t)ourmsg->data_len);
910 if (ourmsg->data_len)
911 bcopy(ourmsg->data, neg->ac_name.data,
912 ourmsg->data_len);
913 neg->ac_name_len = ourmsg->data_len;
914 neg->pkt->pkt_header.ph.code = PADO_CODE;
915 /*
916 * Wait for PADI packet coming from hook.
917 */
918 sp->state = PPPOE_PRIMED;
919 break;
920 case NGM_PPPOE_SERVICE:
921 /*
922 * Check the session is primed.
923 * for now just allow ONE service to be advertised.
924 * If you do it twice you just overwrite.
925 */
926 if (sp->state != PPPOE_PRIMED) {
927 log(LOG_NOTICE, "ng_pppoe[%x]: session not "
928 "primed\n", node->nd_ID);
929 LEAVE(EISCONN);
930 }
931 neg = sp->neg;
932 neg->service.hdr.tag_type = PTT_SRV_NAME;
933 neg->service.hdr.tag_len =
934 htons((uint16_t)ourmsg->data_len);
935
936 if (ourmsg->data_len)
937 bcopy(ourmsg->data, neg->service.data,
938 ourmsg->data_len);
939 neg->service_len = ourmsg->data_len;
940 break;
941 case NGM_PPPOE_SETMODE:
942 {
943 char *s;
944 size_t len;
945
946 if (msg->header.arglen == 0)
947 LEAVE(EINVAL);
948
949 s = (char *)msg->data;
950 len = msg->header.arglen - 1;
951
952 /* Search for matching mode string. */
953 if (len == strlen(NG_PPPOE_STANDARD) &&
954 (strncmp(NG_PPPOE_STANDARD, s, len) == 0)) {
955 privp->flags = 0;
956 privp->eh.ether_type = ETHERTYPE_PPPOE_DISC;
957 break;
958 }
959 if (len == strlen(NG_PPPOE_3COM) &&
960 (strncmp(NG_PPPOE_3COM, s, len) == 0)) {
961 privp->flags |= COMPAT_3COM;
962 privp->eh.ether_type =
963 ETHERTYPE_PPPOE_3COM_DISC;
964 break;
965 }
966 if (len == strlen(NG_PPPOE_DLINK) &&
967 (strncmp(NG_PPPOE_DLINK, s, len) == 0)) {
968 privp->flags |= COMPAT_DLINK;
969 break;
970 }
971 error = EINVAL;
972 break;
973 }
974 case NGM_PPPOE_GETMODE:
975 {
976 char *s;
977 size_t len = 0;
978
979 if (privp->flags == 0)
980 len += strlen(NG_PPPOE_STANDARD) + 1;
981 if (privp->flags & COMPAT_3COM)
982 len += strlen(NG_PPPOE_3COM) + 1;
983 if (privp->flags & COMPAT_DLINK)
984 len += strlen(NG_PPPOE_DLINK) + 1;
985
986 NG_MKRESPONSE(resp, msg, len, M_NOWAIT);
987 if (resp == NULL)
988 LEAVE(ENOMEM);
989
990 s = (char *)resp->data;
991 if (privp->flags == 0) {
992 len = strlen(NG_PPPOE_STANDARD);
993 strlcpy(s, NG_PPPOE_STANDARD, len + 1);
994 break;
995 }
996 if (privp->flags & COMPAT_3COM) {
997 len = strlen(NG_PPPOE_3COM);
998 strlcpy(s, NG_PPPOE_3COM, len + 1);
999 s += len;
1000 }
1001 if (privp->flags & COMPAT_DLINK) {
1002 if (s != resp->data)
1003 *s++ = '|';
1004 len = strlen(NG_PPPOE_DLINK);
1005 strlcpy(s, NG_PPPOE_DLINK, len + 1);
1006 }
1007 break;
1008 }
1009 case NGM_PPPOE_SETENADDR:
1010 if (msg->header.arglen != ETHER_ADDR_LEN)
1011 LEAVE(EINVAL);
1012 bcopy(msg->data, &privp->eh.ether_shost,
1013 ETHER_ADDR_LEN);
1014 break;
1015 case NGM_PPPOE_SETMAXP:
1016 if (msg->header.arglen != sizeof(uint16_t))
1017 LEAVE(EINVAL);
1018 privp->max_payload.hdr.tag_type = PTT_MAX_PAYL;
1019 privp->max_payload.hdr.tag_len = htons(sizeof(uint16_t));
1020 privp->max_payload.data = htons(*((uint16_t *)msg->data));
1021 break;
1022 default:
1023 LEAVE(EINVAL);
1024 }
1025 break;
1026 case NGM_ETHER_COOKIE:
1027 if (!(msg->header.flags & NGF_RESP))
1028 LEAVE(EINVAL);
1029 switch (msg->header.cmd) {
1030 case NGM_ETHER_GET_ENADDR:
1031 if (msg->header.arglen != ETHER_ADDR_LEN)
1032 LEAVE(EINVAL);
1033 bcopy(msg->data, &privp->eh.ether_shost,
1034 ETHER_ADDR_LEN);
1035 break;
1036 default:
1037 LEAVE(EINVAL);
1038 }
1039 break;
1040 default:
1041 LEAVE(EINVAL);
1042 }
1043
1044 /* Take care of synchronous response, if any. */
1045 quit:
1046 CTR2(KTR_NET, "%20s: returning %d", __func__, error);
1047 NG_RESPOND_MSG(error, node, item, resp);
1048 /* Free the message and return. */
1049 NG_FREE_MSG(msg);
1050 return(error);
1051 }
1052
1053 /*
1054 * Start a client into the first state. A separate function because
1055 * it can be needed if the negotiation times out.
1056 */
1057 static void
1058 pppoe_start(sessp sp)
1059 {
1060 hook_p hook = sp->hook;
1061 node_p node = NG_HOOK_NODE(hook);
1062 priv_p privp = NG_NODE_PRIVATE(node);
1063 negp neg = sp->neg;
1064 struct {
1065 struct pppoe_tag hdr;
1066 union uniq data;
1067 } __packed uniqtag;
1068 struct mbuf *m0;
1069 int error;
1070
1071 /*
1072 * Kick the state machine into starting up.
1073 */
1074 CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID);
1075 sp->state = PPPOE_SINIT;
1076 /*
1077 * Reset the packet header to broadcast. Since we are
1078 * in a client mode use configured ethertype.
1079 */
1080 memcpy((void *)&neg->pkt->pkt_header.eh, &privp->eh,
1081 sizeof(struct ether_header));
1082 neg->pkt->pkt_header.ph.code = PADI_CODE;
1083 uniqtag.hdr.tag_type = PTT_HOST_UNIQ;
1084 uniqtag.hdr.tag_len = htons((u_int16_t)sizeof(uniqtag.data));
1085 uniqtag.data.pointer = sp;
1086 init_tags(sp);
1087 insert_tag(sp, &uniqtag.hdr);
1088 insert_tag(sp, &neg->service.hdr);
1089 if (privp->max_payload.data != 0)
1090 insert_tag(sp, &privp->max_payload.hdr);
1091 make_packet(sp);
1092 /*
1093 * Send packet and prepare to retransmit it after timeout.
1094 */
1095 ng_callout(&neg->handle, node, hook, PPPOE_INITIAL_TIMEOUT * hz,
1096 pppoe_ticker, NULL, 0);
1097 neg->timeout = PPPOE_INITIAL_TIMEOUT * 2;
1098 m0 = m_copypacket(neg->m, M_DONTWAIT);
1099 NG_SEND_DATA_ONLY(error, privp->ethernet_hook, m0);
1100 }
1101
1102 static int
1103 send_acname(sessp sp, const struct pppoe_tag *tag)
1104 {
1105 int error, tlen;
1106 struct ng_mesg *msg;
1107 struct ngpppoe_sts *sts;
1108
1109 CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID);
1110
1111 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_ACNAME,
1112 sizeof(struct ngpppoe_sts), M_NOWAIT);
1113 if (msg == NULL)
1114 return (ENOMEM);
1115
1116 sts = (struct ngpppoe_sts *)msg->data;
1117 tlen = min(NG_HOOKSIZ - 1, ntohs(tag->tag_len));
1118 strncpy(sts->hook, (const char *)(tag + 1), tlen);
1119 sts->hook[tlen] = '\0';
1120 NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0);
1121
1122 return (error);
1123 }
1124
1125 static int
1126 send_sessionid(sessp sp)
1127 {
1128 int error;
1129 struct ng_mesg *msg;
1130
1131 CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID);
1132
1133 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_SESSIONID,
1134 sizeof(uint16_t), M_NOWAIT);
1135 if (msg == NULL)
1136 return (ENOMEM);
1137
1138 *(uint16_t *)msg->data = sp->Session_ID;
1139 NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0);
1140
1141 return (error);
1142 }
1143
1144 static int
1145 send_maxp(sessp sp, const struct pppoe_tag *tag)
1146 {
1147 int error;
1148 struct ng_mesg *msg;
1149 struct ngpppoe_maxp *maxp;
1150
1151 CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID);
1152
1153 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_SETMAXP,
1154 sizeof(struct ngpppoe_maxp), M_NOWAIT);
1155 if (msg == NULL)
1156 return (ENOMEM);
1157
1158 maxp = (struct ngpppoe_maxp *)msg->data;
1159 strncpy(maxp->hook, NG_HOOK_NAME(sp->hook), NG_HOOKSIZ);
1160 maxp->data = ntohs(((const struct maxptag *)tag)->data);
1161 NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0);
1162
1163 return (error);
1164 }
1165
1166 /*
1167 * Receive data from session hook and do something with it.
1168 */
1169 static int
1170 ng_pppoe_rcvdata(hook_p hook, item_p item)
1171 {
1172 node_p node = NG_HOOK_NODE(hook);
1173 const priv_p privp = NG_NODE_PRIVATE(node);
1174 sessp sp = NG_HOOK_PRIVATE(hook);
1175 struct pppoe_full_hdr *wh;
1176 struct mbuf *m;
1177 int error;
1178
1179 CTR6(KTR_NET, "%20s: node [%x] (%p) received %p on \"%s\" (%p)",
1180 __func__, node->nd_ID, node, item, hook->hk_name, hook);
1181
1182 NGI_GET_M(item, m);
1183 switch (sp->state) {
1184 case PPPOE_NEWCONNECTED:
1185 case PPPOE_CONNECTED: {
1186 /*
1187 * Remove PPP address and control fields, if any.
1188 * For example, ng_ppp(4) always sends LCP packets
1189 * with address and control fields as required by
1190 * generic PPP. PPPoE is an exception to the rule.
1191 */
1192 if (m->m_pkthdr.len >= 2) {
1193 if (m->m_len < 2 && !(m = m_pullup(m, 2)))
1194 LEAVE(ENOBUFS);
1195 if (mtod(m, u_char *)[0] == 0xff &&
1196 mtod(m, u_char *)[1] == 0x03)
1197 m_adj(m, 2);
1198 }
1199 /*
1200 * Bang in a pre-made header, and set the length up
1201 * to be correct. Then send it to the ethernet driver.
1202 */
1203 M_PREPEND(m, sizeof(*wh), M_DONTWAIT);
1204 if (m == NULL)
1205 LEAVE(ENOBUFS);
1206
1207 wh = mtod(m, struct pppoe_full_hdr *);
1208 bcopy(&sp->pkt_hdr, wh, sizeof(*wh));
1209 wh->ph.length = htons(m->m_pkthdr.len - sizeof(*wh));
1210 NG_FWD_NEW_DATA(error, item, privp->ethernet_hook, m);
1211 privp->packets_out++;
1212 break;
1213 }
1214 case PPPOE_PRIMED: {
1215 struct {
1216 struct pppoe_tag hdr;
1217 union uniq data;
1218 } __packed uniqtag;
1219 const struct pppoe_tag *tag;
1220 struct mbuf *m0;
1221 const struct pppoe_hdr *ph;
1222 negp neg = sp->neg;
1223 uint16_t session;
1224 uint16_t length;
1225 uint8_t code;
1226
1227 /*
1228 * A PADI packet is being returned by the application
1229 * that has set up this hook. This indicates that it
1230 * wants us to offer service.
1231 */
1232 if (m->m_len < sizeof(*wh)) {
1233 m = m_pullup(m, sizeof(*wh));
1234 if (m == NULL)
1235 LEAVE(ENOBUFS);
1236 }
1237 wh = mtod(m, struct pppoe_full_hdr *);
1238 ph = &wh->ph;
1239 session = ntohs(wh->ph.sid);
1240 length = ntohs(wh->ph.length);
1241 code = wh->ph.code;
1242 /* Use peers mode in session. */
1243 neg->pkt->pkt_header.eh.ether_type = wh->eh.ether_type;
1244 if (code != PADI_CODE)
1245 LEAVE(EINVAL);
1246 ng_uncallout(&neg->handle, node);
1247
1248 /*
1249 * This is the first time we hear
1250 * from the client, so note it's
1251 * unicast address, replacing the
1252 * broadcast address.
1253 */
1254 bcopy(wh->eh.ether_shost,
1255 neg->pkt->pkt_header.eh.ether_dhost,
1256 ETHER_ADDR_LEN);
1257 sp->state = PPPOE_SOFFER;
1258 neg->timeout = 0;
1259 neg->pkt->pkt_header.ph.code = PADO_CODE;
1260
1261 /*
1262 * Start working out the tags to respond with.
1263 */
1264 uniqtag.hdr.tag_type = PTT_AC_COOKIE;
1265 uniqtag.hdr.tag_len = htons((u_int16_t)sizeof(sp));
1266 uniqtag.data.pointer = sp;
1267 init_tags(sp);
1268 insert_tag(sp, &neg->ac_name.hdr); /* AC_NAME */
1269 if ((tag = get_tag(ph, PTT_SRV_NAME)))
1270 insert_tag(sp, tag); /* return service */
1271 /*
1272 * If we have a NULL service request
1273 * and have an extra service defined in this hook,
1274 * then also add a tag for the extra service.
1275 * XXX this is a hack. eventually we should be able
1276 * to support advertising many services, not just one
1277 */
1278 if (((tag == NULL) || (tag->tag_len == 0)) &&
1279 (neg->service.hdr.tag_len != 0)) {
1280 insert_tag(sp, &neg->service.hdr); /* SERVICE */
1281 }
1282 if ((tag = get_tag(ph, PTT_HOST_UNIQ)))
1283 insert_tag(sp, tag); /* returned hostunique */
1284 insert_tag(sp, &uniqtag.hdr);
1285 scan_tags(sp, ph);
1286 make_packet(sp);
1287 /*
1288 * Send the offer but if they don't respond
1289 * in PPPOE_OFFER_TIMEOUT seconds, forget about it.
1290 */
1291 ng_callout(&neg->handle, node, hook, PPPOE_OFFER_TIMEOUT * hz,
1292 pppoe_ticker, NULL, 0);
1293 m0 = m_copypacket(sp->neg->m, M_DONTWAIT);
1294 NG_FWD_NEW_DATA(error, item, privp->ethernet_hook, m0);
1295 privp->packets_out++;
1296 break;
1297 }
1298
1299 /*
1300 * Packets coming from the hook make no sense
1301 * to sessions in the rest of states. Throw them away.
1302 */
1303 default:
1304 LEAVE(ENETUNREACH);
1305 }
1306 quit:
1307 if (item)
1308 NG_FREE_ITEM(item);
1309 NG_FREE_M(m);
1310 return (error);
1311 }
1312
1313 /*
1314 * Receive data from ether and do something with it.
1315 */
1316 static int
1317 ng_pppoe_rcvdata_ether(hook_p hook, item_p item)
1318 {
1319 node_p node = NG_HOOK_NODE(hook);
1320 const priv_p privp = NG_NODE_PRIVATE(node);
1321 sessp sp;
1322 const struct pppoe_tag *utag = NULL, *tag = NULL;
1323 const struct pppoe_full_hdr *wh;
1324 const struct pppoe_hdr *ph;
1325 negp neg = NULL;
1326 struct mbuf *m;
1327 hook_p sendhook;
1328 int error = 0;
1329 uint16_t session;
1330 uint16_t length;
1331 uint8_t code;
1332 struct mbuf *m0;
1333
1334 CTR6(KTR_NET, "%20s: node [%x] (%p) received %p on \"%s\" (%p)",
1335 __func__, node->nd_ID, node, item, hook->hk_name, hook);
1336
1337 NGI_GET_M(item, m);
1338 /*
1339 * Dig out various fields from the packet.
1340 * Use them to decide where to send it.
1341 */
1342 privp->packets_in++;
1343 if( m->m_len < sizeof(*wh)) {
1344 m = m_pullup(m, sizeof(*wh)); /* Checks length */
1345 if (m == NULL) {
1346 log(LOG_NOTICE, "ng_pppoe[%x]: couldn't "
1347 "m_pullup(wh)\n", node->nd_ID);
1348 LEAVE(ENOBUFS);
1349 }
1350 }
1351 wh = mtod(m, struct pppoe_full_hdr *);
1352 length = ntohs(wh->ph.length);
1353 switch(wh->eh.ether_type) {
1354 case ETHERTYPE_PPPOE_3COM_DISC: /* fall through */
1355 case ETHERTYPE_PPPOE_DISC:
1356 /*
1357 * We need to try to make sure that the tag area
1358 * is contiguous, or we could wander off the end
1359 * of a buffer and make a mess.
1360 * (Linux wouldn't have this problem).
1361 */
1362 if (m->m_pkthdr.len <= MHLEN) {
1363 if( m->m_len < m->m_pkthdr.len) {
1364 m = m_pullup(m, m->m_pkthdr.len);
1365 if (m == NULL) {
1366 log(LOG_NOTICE, "ng_pppoe[%x]: "
1367 "couldn't m_pullup(pkthdr)\n",
1368 node->nd_ID);
1369 LEAVE(ENOBUFS);
1370 }
1371 }
1372 }
1373 if (m->m_len != m->m_pkthdr.len) {
1374 /*
1375 * It's not all in one piece.
1376 * We need to do extra work.
1377 * Put it into a cluster.
1378 */
1379 struct mbuf *n;
1380 n = m_dup(m, M_DONTWAIT);
1381 m_freem(m);
1382 m = n;
1383 if (m) {
1384 /* just check we got a cluster */
1385 if (m->m_len != m->m_pkthdr.len) {
1386 m_freem(m);
1387 m = NULL;
1388 }
1389 }
1390 if (m == NULL) {
1391 log(LOG_NOTICE, "ng_pppoe[%x]: packet "
1392 "fragmented\n", node->nd_ID);
1393 LEAVE(EMSGSIZE);
1394 }
1395 }
1396 wh = mtod(m, struct pppoe_full_hdr *);
1397 length = ntohs(wh->ph.length);
1398 ph = &wh->ph;
1399 session = ntohs(wh->ph.sid);
1400 code = wh->ph.code;
1401
1402 switch(code) {
1403 case PADI_CODE:
1404 /*
1405 * We are a server:
1406 * Look for a hook with the required service and send
1407 * the ENTIRE packet up there. It should come back to
1408 * a new hook in PRIMED state. Look there for further
1409 * processing.
1410 */
1411 tag = get_tag(ph, PTT_SRV_NAME);
1412 if (tag == NULL) {
1413 CTR1(KTR_NET, "%20s: PADI w/o Service-Name",
1414 __func__);
1415 LEAVE(ENETUNREACH);
1416 }
1417
1418 /*
1419 * First, try to match Service-Name against our
1420 * listening hooks. If no success and we are in D-Link
1421 * compat mode and Service-Name is empty, then we
1422 * broadcast the PADI to all listening hooks.
1423 */
1424 sendhook = pppoe_match_svc(node, tag);
1425 if (sendhook != NULL)
1426 NG_FWD_NEW_DATA(error, item, sendhook, m);
1427 else if (privp->flags & COMPAT_DLINK &&
1428 ntohs(tag->tag_len) == 0)
1429 error = pppoe_broadcast_padi(node, m);
1430 else
1431 error = ENETUNREACH;
1432 break;
1433 case PADO_CODE:
1434 /*
1435 * We are a client:
1436 * Use the host_uniq tag to find the hook this is in
1437 * response to. Received #2, now send #3
1438 * For now simply accept the first we receive.
1439 */
1440 utag = get_tag(ph, PTT_HOST_UNIQ);
1441 if ((utag == NULL) ||
1442 (ntohs(utag->tag_len) != sizeof(sp))) {
1443 log(LOG_NOTICE, "ng_pppoe[%x]: no host "
1444 "unique field\n", node->nd_ID);
1445 LEAVE(ENETUNREACH);
1446 }
1447
1448 sendhook = pppoe_finduniq(node, utag);
1449 if (sendhook == NULL) {
1450 log(LOG_NOTICE, "ng_pppoe[%x]: no "
1451 "matching session\n", node->nd_ID);
1452 LEAVE(ENETUNREACH);
1453 }
1454
1455 /*
1456 * Check the session is in the right state.
1457 * It needs to be in PPPOE_SINIT.
1458 */
1459 sp = NG_HOOK_PRIVATE(sendhook);
1460 if (sp->state == PPPOE_SREQ ||
1461 sp->state == PPPOE_CONNECTED) {
1462 break; /* Multiple PADO is OK. */
1463 }
1464 if (sp->state != PPPOE_SINIT) {
1465 log(LOG_NOTICE, "ng_pppoe[%x]: session "
1466 "in wrong state\n", node->nd_ID);
1467 LEAVE(ENETUNREACH);
1468 }
1469 neg = sp->neg;
1470 /* If requested specific AC-name, check it. */
1471 if (neg->ac_name_len) {
1472 tag = get_tag(ph, PTT_AC_NAME);
1473 if (!tag) {
1474 /* No PTT_AC_NAME in PADO */
1475 break;
1476 }
1477 if (neg->ac_name_len != htons(tag->tag_len) ||
1478 strncmp(neg->ac_name.data,
1479 (const char *)(tag + 1),
1480 neg->ac_name_len) != 0) {
1481 break;
1482 }
1483 }
1484 sp->state = PPPOE_SREQ;
1485 ng_uncallout(&neg->handle, node);
1486
1487 /*
1488 * This is the first time we hear
1489 * from the server, so note it's
1490 * unicast address, replacing the
1491 * broadcast address .
1492 */
1493 bcopy(wh->eh.ether_shost,
1494 neg->pkt->pkt_header.eh.ether_dhost,
1495 ETHER_ADDR_LEN);
1496 neg->timeout = 0;
1497 neg->pkt->pkt_header.ph.code = PADR_CODE;
1498 init_tags(sp);
1499 insert_tag(sp, utag); /* Host Unique */
1500 if ((tag = get_tag(ph, PTT_AC_COOKIE)))
1501 insert_tag(sp, tag); /* return cookie */
1502 if ((tag = get_tag(ph, PTT_AC_NAME))) {
1503 insert_tag(sp, tag); /* return it */
1504 send_acname(sp, tag);
1505 }
1506 if ((tag = get_tag(ph, PTT_MAX_PAYL)) &&
1507 (privp->max_payload.data != 0))
1508 insert_tag(sp, tag); /* return it */
1509 insert_tag(sp, &neg->service.hdr); /* Service */
1510 scan_tags(sp, ph);
1511 make_packet(sp);
1512 sp->state = PPPOE_SREQ;
1513 ng_callout(&neg->handle, node, sp->hook,
1514 PPPOE_INITIAL_TIMEOUT * hz,
1515 pppoe_ticker, NULL, 0);
1516 neg->timeout = PPPOE_INITIAL_TIMEOUT * 2;
1517 m0 = m_copypacket(neg->m, M_DONTWAIT);
1518 NG_FWD_NEW_DATA(error, item, privp->ethernet_hook, m0);
1519 break;
1520 case PADR_CODE:
1521 /*
1522 * We are a server:
1523 * Use the ac_cookie tag to find the
1524 * hook this is in response to.
1525 */
1526 utag = get_tag(ph, PTT_AC_COOKIE);
1527 if ((utag == NULL) ||
1528 (ntohs(utag->tag_len) != sizeof(sp))) {
1529 LEAVE(ENETUNREACH);
1530 }
1531
1532 sendhook = pppoe_finduniq(node, utag);
1533 if (sendhook == NULL)
1534 LEAVE(ENETUNREACH);
1535
1536 /*
1537 * Check the session is in the right state.
1538 * It needs to be in PPPOE_SOFFER or PPPOE_NEWCONNECTED.
1539 * If the latter, then this is a retry by the client,
1540 * so be nice, and resend.
1541 */
1542 sp = NG_HOOK_PRIVATE(sendhook);
1543 if (sp->state == PPPOE_NEWCONNECTED) {
1544 /*
1545 * Whoa! drop back to resend that PADS packet.
1546 * We should still have a copy of it.
1547 */
1548 sp->state = PPPOE_SOFFER;
1549 } else if (sp->state != PPPOE_SOFFER)
1550 LEAVE (ENETUNREACH);
1551 neg = sp->neg;
1552 ng_uncallout(&neg->handle, node);
1553 neg->pkt->pkt_header.ph.code = PADS_CODE;
1554 if (sp->Session_ID == 0) {
1555 neg->pkt->pkt_header.ph.sid =
1556 htons(pppoe_getnewsession(sp));
1557 }
1558 send_sessionid(sp);
1559 neg->timeout = 0;
1560 /*
1561 * start working out the tags to respond with.
1562 */
1563 init_tags(sp);
1564 insert_tag(sp, &neg->ac_name.hdr); /* AC_NAME */
1565 if ((tag = get_tag(ph, PTT_SRV_NAME)))
1566 insert_tag(sp, tag);/* return service */
1567 if ((tag = get_tag(ph, PTT_HOST_UNIQ)))
1568 insert_tag(sp, tag); /* return it */
1569 insert_tag(sp, utag); /* ac_cookie */
1570 scan_tags(sp, ph);
1571 make_packet(sp);
1572 sp->state = PPPOE_NEWCONNECTED;
1573
1574 /* Send the PADS without a timeout - we're now connected. */
1575 m0 = m_copypacket(sp->neg->m, M_DONTWAIT);
1576 NG_FWD_NEW_DATA(error, item, privp->ethernet_hook, m0);
1577
1578 /*
1579 * Having sent the last Negotiation header,
1580 * Set up the stored packet header to be correct for
1581 * the actual session. But keep the negotialtion stuff
1582 * around in case we need to resend this last packet.
1583 * We'll discard it when we move from NEWCONNECTED
1584 * to CONNECTED
1585 */
1586 sp->pkt_hdr = neg->pkt->pkt_header;
1587 /* Configure ethertype depending on what
1588 * ethertype was used at discovery phase */
1589 if (sp->pkt_hdr.eh.ether_type ==
1590 ETHERTYPE_PPPOE_3COM_DISC)
1591 sp->pkt_hdr.eh.ether_type
1592 = ETHERTYPE_PPPOE_3COM_SESS;
1593 else
1594 sp->pkt_hdr.eh.ether_type
1595 = ETHERTYPE_PPPOE_SESS;
1596 sp->pkt_hdr.ph.code = 0;
1597 pppoe_send_event(sp, NGM_PPPOE_SUCCESS);
1598 break;
1599 case PADS_CODE:
1600 /*
1601 * We are a client:
1602 * Use the host_uniq tag to find the hook this is in
1603 * response to. Take the session ID and store it away.
1604 * Also make sure the pre-made header is correct and
1605 * set us into Session mode.
1606 */
1607 utag = get_tag(ph, PTT_HOST_UNIQ);
1608 if ((utag == NULL) ||
1609 (ntohs(utag->tag_len) != sizeof(sp))) {
1610 LEAVE (ENETUNREACH);
1611 }
1612 sendhook = pppoe_finduniq(node, utag);
1613 if (sendhook == NULL)
1614 LEAVE(ENETUNREACH);
1615
1616 /*
1617 * Check the session is in the right state.
1618 * It needs to be in PPPOE_SREQ.
1619 */
1620 sp = NG_HOOK_PRIVATE(sendhook);
1621 if (sp->state != PPPOE_SREQ)
1622 LEAVE(ENETUNREACH);
1623 neg = sp->neg;
1624 ng_uncallout(&neg->handle, node);
1625 neg->pkt->pkt_header.ph.sid = wh->ph.sid;
1626 sp->Session_ID = ntohs(wh->ph.sid);
1627 pppoe_addsession(sp);
1628 send_sessionid(sp);
1629 neg->timeout = 0;
1630 sp->state = PPPOE_CONNECTED;
1631 /*
1632 * Now we have gone to Connected mode,
1633 * Free all resources needed for negotiation.
1634 * Keep a copy of the header we will be using.
1635 */
1636 sp->pkt_hdr = neg->pkt->pkt_header;
1637 if (privp->flags & COMPAT_3COM)
1638 sp->pkt_hdr.eh.ether_type
1639 = ETHERTYPE_PPPOE_3COM_SESS;
1640 else
1641 sp->pkt_hdr.eh.ether_type
1642 = ETHERTYPE_PPPOE_SESS;
1643 sp->pkt_hdr.ph.code = 0;
1644 m_freem(neg->m);
1645 free(sp->neg, M_NETGRAPH_PPPOE);
1646 sp->neg = NULL;
1647 if ((tag = get_tag(ph, PTT_MAX_PAYL)) &&
1648 (privp->max_payload.data != 0))
1649 send_maxp(sp, tag);
1650 pppoe_send_event(sp, NGM_PPPOE_SUCCESS);
1651 break;
1652 case PADT_CODE:
1653 /*
1654 * Find matching peer/session combination.
1655 */
1656 sp = pppoe_findsession(privp, wh);
1657 if (sp == NULL)
1658 LEAVE(ENETUNREACH);
1659 /* Disconnect that hook. */
1660 ng_rmhook_self(sp->hook);
1661 break;
1662 default:
1663 LEAVE(EPFNOSUPPORT);
1664 }
1665 break;
1666 case ETHERTYPE_PPPOE_3COM_SESS:
1667 case ETHERTYPE_PPPOE_SESS:
1668 /*
1669 * Find matching peer/session combination.
1670 */
1671 sp = pppoe_findsession(privp, wh);
1672 if (sp == NULL)
1673 LEAVE (ENETUNREACH);
1674 m_adj(m, sizeof(*wh));
1675
1676 /* If packet too short, dump it. */
1677 if (m->m_pkthdr.len < length)
1678 LEAVE(EMSGSIZE);
1679 /* Also need to trim excess at the end */
1680 if (m->m_pkthdr.len > length) {
1681 m_adj(m, -((int)(m->m_pkthdr.len - length)));
1682 }
1683 if ( sp->state != PPPOE_CONNECTED) {
1684 if (sp->state == PPPOE_NEWCONNECTED) {
1685 sp->state = PPPOE_CONNECTED;
1686 /*
1687 * Now we have gone to Connected mode,
1688 * Free all resources needed for negotiation.
1689 * Be paranoid about whether there may be
1690 * a timeout.
1691 */
1692 m_freem(sp->neg->m);
1693 ng_uncallout(&sp->neg->handle, node);
1694 free(sp->neg, M_NETGRAPH_PPPOE);
1695 sp->neg = NULL;
1696 } else {
1697 LEAVE (ENETUNREACH);
1698 }
1699 }
1700 NG_FWD_NEW_DATA(error, item, sp->hook, m);
1701 break;
1702 default:
1703 LEAVE(EPFNOSUPPORT);
1704 }
1705 quit:
1706 if (item)
1707 NG_FREE_ITEM(item);
1708 NG_FREE_M(m);
1709 return (error);
1710 }
1711
1712 /*
1713 * Receive data from debug hook and bypass it to ether.
1714 */
1715 static int
1716 ng_pppoe_rcvdata_debug(hook_p hook, item_p item)
1717 {
1718 node_p node = NG_HOOK_NODE(hook);
1719 const priv_p privp = NG_NODE_PRIVATE(node);
1720 int error;
1721
1722 CTR6(KTR_NET, "%20s: node [%x] (%p) received %p on \"%s\" (%p)",
1723 __func__, node->nd_ID, node, item, hook->hk_name, hook);
1724
1725 NG_FWD_ITEM_HOOK(error, item, privp->ethernet_hook);
1726 privp->packets_out++;
1727 return (error);
1728 }
1729
1730 /*
1731 * Do local shutdown processing..
1732 * If we are a persistant device, we might refuse to go away, and
1733 * we'd only remove our links and reset ourself.
1734 */
1735 static int
1736 ng_pppoe_shutdown(node_p node)
1737 {
1738 const priv_p privp = NG_NODE_PRIVATE(node);
1739 int i;
1740
1741 for (i = 0; i < SESSHASHSIZE; i++)
1742 mtx_destroy(&privp->sesshash[i].mtx);
1743 NG_NODE_SET_PRIVATE(node, NULL);
1744 NG_NODE_UNREF(privp->node);
1745 free(privp, M_NETGRAPH_PPPOE);
1746 return (0);
1747 }
1748
1749 /*
1750 * Hook disconnection
1751 *
1752 * Clean up all dangling links and information about the session/hook.
1753 * For this type, removal of the last link destroys the node.
1754 */
1755 static int
1756 ng_pppoe_disconnect(hook_p hook)
1757 {
1758 node_p node = NG_HOOK_NODE(hook);
1759 priv_p privp = NG_NODE_PRIVATE(node);
1760 sessp sp;
1761
1762 if (hook == privp->debug_hook) {
1763 privp->debug_hook = NULL;
1764 } else if (hook == privp->ethernet_hook) {
1765 privp->ethernet_hook = NULL;
1766 if (NG_NODE_IS_VALID(node))
1767 ng_rmnode_self(node);
1768 } else {
1769 sp = NG_HOOK_PRIVATE(hook);
1770 if (sp->state != PPPOE_SNONE ) {
1771 pppoe_send_event(sp, NGM_PPPOE_CLOSE);
1772 }
1773 /*
1774 * According to the spec, if we are connected,
1775 * we should send a DISC packet if we are shutting down
1776 * a session.
1777 */
1778 if ((privp->ethernet_hook)
1779 && ((sp->state == PPPOE_CONNECTED)
1780 || (sp->state == PPPOE_NEWCONNECTED))) {
1781 struct mbuf *m;
1782
1783 /* Generate a packet of that type. */
1784 MGETHDR(m, M_DONTWAIT, MT_DATA);
1785 if (m == NULL)
1786 log(LOG_NOTICE, "ng_pppoe[%x]: session out of "
1787 "mbufs\n", node->nd_ID);
1788 else {
1789 struct pppoe_full_hdr *wh;
1790 struct pppoe_tag *tag;
1791 int msglen = strlen(SIGNOFF);
1792 int error = 0;
1793
1794 m->m_pkthdr.rcvif = NULL;
1795 m->m_pkthdr.len = m->m_len = sizeof(*wh);
1796 wh = mtod(m, struct pppoe_full_hdr *);
1797 bcopy(&sp->pkt_hdr, wh, sizeof(*wh));
1798
1799 /* Revert the stored header to DISC/PADT mode. */
1800 wh->ph.code = PADT_CODE;
1801 /*
1802 * Configure ethertype depending on what
1803 * was used during sessions stage.
1804 */
1805 if (wh->eh.ether_type ==
1806 ETHERTYPE_PPPOE_3COM_SESS)
1807 wh->eh.ether_type = ETHERTYPE_PPPOE_3COM_DISC;
1808 else
1809 wh->eh.ether_type = ETHERTYPE_PPPOE_DISC;
1810 /*
1811 * Add a General error message and adjust
1812 * sizes.
1813 */
1814 tag = (void *)(&wh->ph + 1);
1815 tag->tag_type = PTT_GEN_ERR;
1816 tag->tag_len = htons((u_int16_t)msglen);
1817 strncpy((char *)(tag + 1), SIGNOFF, msglen);
1818 m->m_pkthdr.len = (m->m_len += sizeof(*tag) +
1819 msglen);
1820 wh->ph.length = htons(sizeof(*tag) + msglen);
1821 NG_SEND_DATA_ONLY(error,
1822 privp->ethernet_hook, m);
1823 }
1824 }
1825 if (sp->state == PPPOE_LISTENING)
1826 LIST_REMOVE(sp, sessions);
1827 else if (sp->Session_ID)
1828 pppoe_delsession(sp);
1829 /*
1830 * As long as we have somewhere to store the timeout handle,
1831 * we may have a timeout pending.. get rid of it.
1832 */
1833 if (sp->neg) {
1834 ng_uncallout(&sp->neg->handle, node);
1835 if (sp->neg->m)
1836 m_freem(sp->neg->m);
1837 free(sp->neg, M_NETGRAPH_PPPOE);
1838 }
1839 free(sp, M_NETGRAPH_PPPOE);
1840 NG_HOOK_SET_PRIVATE(hook, NULL);
1841 }
1842 if ((NG_NODE_NUMHOOKS(node) == 0) &&
1843 (NG_NODE_IS_VALID(node)))
1844 ng_rmnode_self(node);
1845 return (0);
1846 }
1847
1848 /*
1849 * Timeouts come here.
1850 */
1851 static void
1852 pppoe_ticker(node_p node, hook_p hook, void *arg1, int arg2)
1853 {
1854 priv_p privp = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
1855 sessp sp = NG_HOOK_PRIVATE(hook);
1856 negp neg = sp->neg;
1857 struct mbuf *m0 = NULL;
1858 int error = 0;
1859
1860 CTR6(KTR_NET, "%20s: node [%x] (%p) hook \"%s\" (%p) session %d",
1861 __func__, node->nd_ID, node, hook->hk_name, hook, sp->Session_ID);
1862 switch(sp->state) {
1863 /*
1864 * Resend the last packet, using an exponential backoff.
1865 * After a period of time, stop growing the backoff,
1866 * And either leave it, or revert to the start.
1867 */
1868 case PPPOE_SINIT:
1869 case PPPOE_SREQ:
1870 /* Timeouts on these produce resends. */
1871 m0 = m_copypacket(sp->neg->m, M_DONTWAIT);
1872 NG_SEND_DATA_ONLY( error, privp->ethernet_hook, m0);
1873 ng_callout(&neg->handle, node, hook, neg->timeout * hz,
1874 pppoe_ticker, NULL, 0);
1875 if ((neg->timeout <<= 1) > PPPOE_TIMEOUT_LIMIT) {
1876 if (sp->state == PPPOE_SREQ) {
1877 /* Revert to SINIT mode. */
1878 pppoe_start(sp);
1879 } else {
1880 neg->timeout = PPPOE_TIMEOUT_LIMIT;
1881 }
1882 }
1883 break;
1884 case PPPOE_PRIMED:
1885 case PPPOE_SOFFER:
1886 /* A timeout on these says "give up" */
1887 ng_rmhook_self(hook);
1888 break;
1889 default:
1890 /* Timeouts have no meaning in other states. */
1891 log(LOG_NOTICE, "ng_pppoe[%x]: unexpected timeout\n",
1892 node->nd_ID);
1893 }
1894 }
1895
1896 /*
1897 * Parse an incoming packet to see if any tags should be copied to the
1898 * output packet. Don't do any tags that have been handled in the main
1899 * state machine.
1900 */
1901 static const struct pppoe_tag*
1902 scan_tags(sessp sp, const struct pppoe_hdr* ph)
1903 {
1904 const char *const end = (const char *)next_tag(ph);
1905 const char *ptn;
1906 const struct pppoe_tag *pt = (const void *)(ph + 1);
1907
1908 /*
1909 * Keep processing tags while a tag header will still fit.
1910 */
1911 CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID);
1912
1913 while((const char*)(pt + 1) <= end) {
1914 /*
1915 * If the tag data would go past the end of the packet, abort.
1916 */
1917 ptn = (((const char *)(pt + 1)) + ntohs(pt->tag_len));
1918 if(ptn > end)
1919 return NULL;
1920
1921 switch (pt->tag_type) {
1922 case PTT_RELAY_SID:
1923 insert_tag(sp, pt);
1924 break;
1925 case PTT_EOL:
1926 return NULL;
1927 case PTT_SRV_NAME:
1928 case PTT_AC_NAME:
1929 case PTT_HOST_UNIQ:
1930 case PTT_AC_COOKIE:
1931 case PTT_VENDOR:
1932 case PTT_SRV_ERR:
1933 case PTT_SYS_ERR:
1934 case PTT_GEN_ERR:
1935 case PTT_MAX_PAYL:
1936 break;
1937 }
1938 pt = (const struct pppoe_tag*)ptn;
1939 }
1940 return NULL;
1941 }
1942
1943 static int
1944 pppoe_send_event(sessp sp, enum cmd cmdid)
1945 {
1946 int error;
1947 struct ng_mesg *msg;
1948 struct ngpppoe_sts *sts;
1949
1950 CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID);
1951
1952 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, cmdid,
1953 sizeof(struct ngpppoe_sts), M_NOWAIT);
1954 if (msg == NULL)
1955 return (ENOMEM);
1956 sts = (struct ngpppoe_sts *)msg->data;
1957 strncpy(sts->hook, NG_HOOK_NAME(sp->hook), NG_HOOKSIZ);
1958 NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0);
1959 return (error);
1960 }
Cache object: 9fcc44157f5efacc933803547ab8e651
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