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 * $Whistle: ng_pppoe.c,v 1.10 1999/11/01 09:24:52 julian Exp $
40 */
41
42 #include <sys/param.h>
43 #include <sys/systm.h>
44 #include <sys/kernel.h>
45 #include <sys/ktr.h>
46 #include <sys/mbuf.h>
47 #include <sys/malloc.h>
48 #include <sys/errno.h>
49 #include <sys/epoch.h>
50 #include <sys/socket.h>
51 #include <sys/sysctl.h>
52 #include <sys/syslog.h>
53 #include <net/ethernet.h>
54 #include <net/if.h>
55 #include <net/if_vlan_var.h>
56 #include <net/vnet.h>
57
58 #include <netgraph/ng_message.h>
59 #include <netgraph/netgraph.h>
60 #include <netgraph/ng_parse.h>
61 #include <netgraph/ng_pppoe.h>
62 #include <netgraph/ng_ether.h>
63
64 #ifdef NG_SEPARATE_MALLOC
65 static MALLOC_DEFINE(M_NETGRAPH_PPPOE, "netgraph_pppoe", "netgraph pppoe node");
66 #else
67 #define M_NETGRAPH_PPPOE M_NETGRAPH
68 #endif
69
70 /* Some PPP protocol numbers we're interested in */
71 #define PROT_LCP 0xc021
72
73 #define SIGNOFF "session closed"
74
75 VNET_DEFINE_STATIC(u_int32_t, ng_pppoe_lcp_pcp) = 0;
76 #define V_ng_pppoe_lcp_pcp VNET(ng_pppoe_lcp_pcp)
77
78 SYSCTL_NODE(_net_graph, OID_AUTO, pppoe, CTLFLAG_RW, 0, "PPPoE");
79 SYSCTL_UINT(_net_graph_pppoe, OID_AUTO, lcp_pcp,
80 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ng_pppoe_lcp_pcp), 0,
81 "Set PCP for LCP");
82
83 /*
84 * This section contains the netgraph method declarations for the
85 * pppoe node. These methods define the netgraph pppoe 'type'.
86 */
87
88 static ng_constructor_t ng_pppoe_constructor;
89 static ng_rcvmsg_t ng_pppoe_rcvmsg;
90 static ng_shutdown_t ng_pppoe_shutdown;
91 static ng_newhook_t ng_pppoe_newhook;
92 static ng_connect_t ng_pppoe_connect;
93 static ng_rcvdata_t ng_pppoe_rcvdata;
94 static ng_rcvdata_t ng_pppoe_rcvdata_ether;
95 static ng_rcvdata_t ng_pppoe_rcvdata_debug;
96 static ng_disconnect_t ng_pppoe_disconnect;
97
98 /* Parse type for struct ngpppoe_init_data */
99 static const struct ng_parse_struct_field ngpppoe_init_data_type_fields[]
100 = NG_PPPOE_INIT_DATA_TYPE_INFO;
101 static const struct ng_parse_type ngpppoe_init_data_state_type = {
102 &ng_parse_struct_type,
103 &ngpppoe_init_data_type_fields
104 };
105
106 /* Parse type for struct ngpppoe_sts */
107 static const struct ng_parse_struct_field ng_pppoe_sts_type_fields[]
108 = NG_PPPOE_STS_TYPE_INFO;
109 static const struct ng_parse_type ng_pppoe_sts_state_type = {
110 &ng_parse_struct_type,
111 &ng_pppoe_sts_type_fields
112 };
113
114 /* List of commands and how to convert arguments to/from ASCII */
115 static const struct ng_cmdlist ng_pppoe_cmds[] = {
116 {
117 NGM_PPPOE_COOKIE,
118 NGM_PPPOE_CONNECT,
119 "pppoe_connect",
120 &ngpppoe_init_data_state_type,
121 NULL
122 },
123 {
124 NGM_PPPOE_COOKIE,
125 NGM_PPPOE_LISTEN,
126 "pppoe_listen",
127 &ngpppoe_init_data_state_type,
128 NULL
129 },
130 {
131 NGM_PPPOE_COOKIE,
132 NGM_PPPOE_OFFER,
133 "pppoe_offer",
134 &ngpppoe_init_data_state_type,
135 NULL
136 },
137 {
138 NGM_PPPOE_COOKIE,
139 NGM_PPPOE_SERVICE,
140 "pppoe_service",
141 &ngpppoe_init_data_state_type,
142 NULL
143 },
144 {
145 NGM_PPPOE_COOKIE,
146 NGM_PPPOE_SUCCESS,
147 "pppoe_success",
148 &ng_pppoe_sts_state_type,
149 NULL
150 },
151 {
152 NGM_PPPOE_COOKIE,
153 NGM_PPPOE_FAIL,
154 "pppoe_fail",
155 &ng_pppoe_sts_state_type,
156 NULL
157 },
158 {
159 NGM_PPPOE_COOKIE,
160 NGM_PPPOE_CLOSE,
161 "pppoe_close",
162 &ng_pppoe_sts_state_type,
163 NULL
164 },
165 {
166 NGM_PPPOE_COOKIE,
167 NGM_PPPOE_SETMODE,
168 "pppoe_setmode",
169 &ng_parse_string_type,
170 NULL
171 },
172 {
173 NGM_PPPOE_COOKIE,
174 NGM_PPPOE_GETMODE,
175 "pppoe_getmode",
176 NULL,
177 &ng_parse_string_type
178 },
179 {
180 NGM_PPPOE_COOKIE,
181 NGM_PPPOE_SETENADDR,
182 "setenaddr",
183 &ng_parse_enaddr_type,
184 NULL
185 },
186 {
187 NGM_PPPOE_COOKIE,
188 NGM_PPPOE_SETMAXP,
189 "setmaxp",
190 &ng_parse_uint16_type,
191 NULL
192 },
193 {
194 NGM_PPPOE_COOKIE,
195 NGM_PPPOE_SEND_HURL,
196 "send_hurl",
197 &ngpppoe_init_data_state_type,
198 NULL
199 },
200 {
201 NGM_PPPOE_COOKIE,
202 NGM_PPPOE_SEND_MOTM,
203 "send_motm",
204 &ngpppoe_init_data_state_type,
205 NULL
206 },
207 { 0 }
208 };
209
210 /* Netgraph node type descriptor */
211 static struct ng_type typestruct = {
212 .version = NG_ABI_VERSION,
213 .name = NG_PPPOE_NODE_TYPE,
214 .constructor = ng_pppoe_constructor,
215 .rcvmsg = ng_pppoe_rcvmsg,
216 .shutdown = ng_pppoe_shutdown,
217 .newhook = ng_pppoe_newhook,
218 .connect = ng_pppoe_connect,
219 .rcvdata = ng_pppoe_rcvdata,
220 .disconnect = ng_pppoe_disconnect,
221 .cmdlist = ng_pppoe_cmds,
222 };
223 NETGRAPH_INIT(pppoe, &typestruct);
224
225 /*
226 * States for the session state machine.
227 * These have no meaning if there is no hook attached yet.
228 */
229 enum state {
230 PPPOE_SNONE=0, /* [both] Initial state */
231 PPPOE_LISTENING, /* [Daemon] Listening for discover initiation pkt */
232 PPPOE_SINIT, /* [Client] Sent discovery initiation */
233 PPPOE_PRIMED, /* [Server] Awaiting PADI from daemon */
234 PPPOE_SOFFER, /* [Server] Sent offer message (got PADI)*/
235 PPPOE_SREQ, /* [Client] Sent a Request */
236 PPPOE_NEWCONNECTED, /* [Server] Connection established, No data received */
237 PPPOE_CONNECTED, /* [Both] Connection established, Data received */
238 PPPOE_DEAD /* [Both] */
239 };
240
241 #define NUMTAGS 20 /* number of tags we are set up to work with */
242
243 /*
244 * Information we store for each hook on each node for negotiating the
245 * session. The mbuf and cluster are freed once negotiation has completed.
246 * The whole negotiation block is then discarded.
247 */
248
249 struct sess_neg {
250 struct mbuf *m; /* holds cluster with last sent packet */
251 union packet *pkt; /* points within the above cluster */
252 struct callout handle; /* see timeout(9) */
253 u_int timeout; /* 0,1,2,4,8,16 etc. seconds */
254 u_int numtags;
255 const struct pppoe_tag *tags[NUMTAGS];
256 u_int service_len;
257 u_int ac_name_len;
258 u_int host_uniq_len;
259
260 struct datatag service;
261 struct datatag ac_name;
262 struct datatag host_uniq;
263 };
264 typedef struct sess_neg *negp;
265
266 /*
267 * Session information that is needed after connection.
268 */
269 struct sess_con {
270 hook_p hook;
271 uint16_t Session_ID;
272 enum state state;
273 ng_ID_t creator; /* who to notify */
274 struct pppoe_full_hdr pkt_hdr; /* used when connected */
275 negp neg; /* used when negotiating */
276 LIST_ENTRY(sess_con) sessions;
277 };
278 typedef struct sess_con *sessp;
279
280 #define SESSHASHSIZE 0x0100
281 #define SESSHASH(x) (((x) ^ ((x) >> 8)) & (SESSHASHSIZE - 1))
282
283 struct sess_hash_entry {
284 struct mtx mtx;
285 LIST_HEAD(hhead, sess_con) head;
286 };
287
288 /*
289 * Information we store for each node
290 */
291 struct PPPoE {
292 node_p node; /* back pointer to node */
293 hook_p ethernet_hook;
294 hook_p debug_hook;
295 u_int packets_in; /* packets in from ethernet */
296 u_int packets_out; /* packets out towards ethernet */
297 uint32_t flags;
298 #define COMPAT_3COM 0x00000001
299 #define COMPAT_DLINK 0x00000002
300 struct ether_header eh;
301 LIST_HEAD(, sess_con) listeners;
302 struct sess_hash_entry sesshash[SESSHASHSIZE];
303 struct maxptag max_payload; /* PPP-Max-Payload (RFC4638) */
304 };
305 typedef struct PPPoE *priv_p;
306
307 union uniq {
308 char bytes[sizeof(void *)];
309 void *pointer;
310 };
311
312 #define LEAVE(x) do { error = x; goto quit; } while(0)
313 static void pppoe_start(sessp sp);
314 static void pppoe_ticker(node_p node, hook_p hook, void *arg1, int arg2);
315 static const struct pppoe_tag *scan_tags(sessp sp,
316 const struct pppoe_hdr* ph);
317 static int pppoe_send_event(sessp sp, enum cmd cmdid);
318
319 /*************************************************************************
320 * Some basic utilities from the Linux version with author's permission.*
321 * Author: Michal Ostrowski <mostrows@styx.uwaterloo.ca> *
322 ************************************************************************/
323
324 /*
325 * Return the location where the next tag can be put
326 */
327 static __inline const struct pppoe_tag*
next_tag(const struct pppoe_hdr * ph)328 next_tag(const struct pppoe_hdr* ph)
329 {
330 return (const struct pppoe_tag*)(((const char*)(ph + 1))
331 + ntohs(ph->length));
332 }
333
334 /*
335 * Look for a tag of a specific type.
336 * Don't trust any length the other end says,
337 * but assume we already sanity checked ph->length.
338 */
339 static const struct pppoe_tag*
get_tag(const struct pppoe_hdr * ph,uint16_t idx)340 get_tag(const struct pppoe_hdr* ph, uint16_t idx)
341 {
342 const char *const end = (const char *)next_tag(ph);
343 const struct pppoe_tag *pt = (const void *)(ph + 1);
344 const char *ptn;
345
346 /*
347 * Keep processing tags while a tag header will still fit.
348 */
349 while((const char*)(pt + 1) <= end) {
350 /*
351 * If the tag data would go past the end of the packet, abort.
352 */
353 ptn = (((const char *)(pt + 1)) + ntohs(pt->tag_len));
354 if (ptn > end) {
355 CTR2(KTR_NET, "%20s: invalid length for tag %d",
356 __func__, idx);
357 return (NULL);
358 }
359 if (pt->tag_type == idx) {
360 CTR2(KTR_NET, "%20s: found tag %d", __func__, idx);
361 return (pt);
362 }
363
364 pt = (const struct pppoe_tag*)ptn;
365 }
366
367 CTR2(KTR_NET, "%20s: not found tag %d", __func__, idx);
368 return (NULL);
369 }
370
371 /**************************************************************************
372 * Inlines to initialise or add tags to a session's tag list.
373 **************************************************************************/
374 /*
375 * Initialise the session's tag list.
376 */
377 static void
init_tags(sessp sp)378 init_tags(sessp sp)
379 {
380 KASSERT(sp->neg != NULL, ("%s: no neg", __func__));
381 sp->neg->numtags = 0;
382 }
383
384 static void
insert_tag(sessp sp,const struct pppoe_tag * tp)385 insert_tag(sessp sp, const struct pppoe_tag *tp)
386 {
387 negp neg = sp->neg;
388 int i;
389
390 KASSERT(neg != NULL, ("%s: no neg", __func__));
391 if ((i = neg->numtags++) < NUMTAGS) {
392 neg->tags[i] = tp;
393 } else {
394 log(LOG_NOTICE, "ng_pppoe: asked to add too many tags to "
395 "packet\n");
396 neg->numtags--;
397 }
398 }
399
400 /*
401 * Make up a packet, using the tags filled out for the session.
402 *
403 * Assume that the actual pppoe header and ethernet header
404 * are filled out externally to this routine.
405 * Also assume that neg->wh points to the correct
406 * location at the front of the buffer space.
407 */
408 static void
make_packet(sessp sp)409 make_packet(sessp sp) {
410 struct pppoe_full_hdr *wh = &sp->neg->pkt->pkt_header;
411 const struct pppoe_tag **tag;
412 char *dp;
413 int count;
414 int tlen;
415 uint16_t length = 0;
416
417 KASSERT((sp->neg != NULL) && (sp->neg->m != NULL),
418 ("%s: called from wrong state", __func__));
419 CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID);
420
421 dp = (char *)(&wh->ph + 1);
422 for (count = 0, tag = sp->neg->tags;
423 ((count < sp->neg->numtags) && (count < NUMTAGS));
424 tag++, count++) {
425 tlen = ntohs((*tag)->tag_len) + sizeof(**tag);
426 if ((length + tlen) > (ETHER_MAX_LEN - 4 - sizeof(*wh))) {
427 log(LOG_NOTICE, "ng_pppoe: tags too long\n");
428 sp->neg->numtags = count;
429 break; /* XXX chop off what's too long */
430 }
431 bcopy(*tag, (char *)dp, tlen);
432 length += tlen;
433 dp += tlen;
434 }
435 wh->ph.length = htons(length);
436 sp->neg->m->m_len = length + sizeof(*wh);
437 sp->neg->m->m_pkthdr.len = length + sizeof(*wh);
438 }
439
440 /**************************************************************************
441 * Routines to match a service. *
442 **************************************************************************/
443
444 /*
445 * Find a hook that has a service string that matches that
446 * we are seeking. For now use a simple string.
447 * In the future we may need something like regexp().
448 *
449 * Null string is a wildcard (ANY service), according to RFC2516.
450 * And historical FreeBSD wildcard is also "*".
451 */
452
453 static hook_p
pppoe_match_svc(node_p node,const struct pppoe_tag * tag)454 pppoe_match_svc(node_p node, const struct pppoe_tag *tag)
455 {
456 const priv_p privp = NG_NODE_PRIVATE(node);
457 sessp sp;
458
459 LIST_FOREACH(sp, &privp->listeners, sessions) {
460 negp neg = sp->neg;
461
462 /* Empty Service-Name matches any service. */
463 if (neg->service_len == 0)
464 break;
465
466 /* Special case for a blank or "*" service name (wildcard). */
467 if (neg->service_len == 1 && neg->service.data[0] == '*')
468 break;
469
470 /* If the lengths don't match, that aint it. */
471 if (neg->service_len != ntohs(tag->tag_len))
472 continue;
473
474 if (strncmp((const char *)(tag + 1), neg->service.data,
475 ntohs(tag->tag_len)) == 0)
476 break;
477 }
478 CTR3(KTR_NET, "%20s: matched %p for %s", __func__,
479 sp?sp->hook:NULL, (const char *)(tag + 1));
480
481 return (sp?sp->hook:NULL);
482 }
483
484 /*
485 * Broadcast the PADI packet in m0 to all listening hooks.
486 * This routine is called when a PADI with empty Service-Name
487 * tag is received. Client should receive PADOs with all
488 * available services.
489 */
490 static int
pppoe_broadcast_padi(node_p node,struct mbuf * m0)491 pppoe_broadcast_padi(node_p node, struct mbuf *m0)
492 {
493 const priv_p privp = NG_NODE_PRIVATE(node);
494 sessp sp;
495 int error = 0;
496
497 LIST_FOREACH(sp, &privp->listeners, sessions) {
498 struct mbuf *m;
499
500 m = m_dup(m0, M_NOWAIT);
501 if (m == NULL)
502 return (ENOMEM);
503 NG_SEND_DATA_ONLY(error, sp->hook, m);
504 if (error)
505 return (error);
506 }
507
508 return (0);
509 }
510
511 /*
512 * Find a hook, which name equals to given service.
513 */
514 static hook_p
pppoe_find_svc(node_p node,const char * svc_name,int svc_len)515 pppoe_find_svc(node_p node, const char *svc_name, int svc_len)
516 {
517 const priv_p privp = NG_NODE_PRIVATE(node);
518 sessp sp;
519
520 LIST_FOREACH(sp, &privp->listeners, sessions) {
521 negp neg = sp->neg;
522
523 if (neg->service_len == svc_len &&
524 strncmp(svc_name, neg->service.data, svc_len) == 0)
525 return (sp->hook);
526 }
527
528 return (NULL);
529 }
530
531 /**************************************************************************
532 * Routines to find a particular session that matches an incoming packet. *
533 **************************************************************************/
534 /* Find free session and add to hash. */
535 static uint16_t
pppoe_getnewsession(sessp sp)536 pppoe_getnewsession(sessp sp)
537 {
538 const priv_p privp = NG_NODE_PRIVATE(NG_HOOK_NODE(sp->hook));
539 static uint16_t pppoe_sid = 1;
540 sessp tsp;
541 uint16_t val, hash;
542
543 restart:
544 /* Atomicity is not needed here as value will be checked. */
545 val = pppoe_sid++;
546 /* Spec says 0xFFFF is reserved, also don't use 0x0000. */
547 if (val == 0xffff || val == 0x0000)
548 val = pppoe_sid = 1;
549
550 /* Check it isn't already in use. */
551 hash = SESSHASH(val);
552 mtx_lock(&privp->sesshash[hash].mtx);
553 LIST_FOREACH(tsp, &privp->sesshash[hash].head, sessions) {
554 if (tsp->Session_ID == val)
555 break;
556 }
557 if (!tsp) {
558 sp->Session_ID = val;
559 LIST_INSERT_HEAD(&privp->sesshash[hash].head, sp, sessions);
560 }
561 mtx_unlock(&privp->sesshash[hash].mtx);
562 if (tsp)
563 goto restart;
564
565 CTR2(KTR_NET, "%20s: new sid %d", __func__, val);
566
567 return (val);
568 }
569
570 /* Add specified session to hash. */
571 static void
pppoe_addsession(sessp sp)572 pppoe_addsession(sessp sp)
573 {
574 const priv_p privp = NG_NODE_PRIVATE(NG_HOOK_NODE(sp->hook));
575 uint16_t hash = SESSHASH(sp->Session_ID);
576
577 mtx_lock(&privp->sesshash[hash].mtx);
578 LIST_INSERT_HEAD(&privp->sesshash[hash].head, sp, sessions);
579 mtx_unlock(&privp->sesshash[hash].mtx);
580 }
581
582 /* Delete specified session from hash. */
583 static void
pppoe_delsession(sessp sp)584 pppoe_delsession(sessp sp)
585 {
586 const priv_p privp = NG_NODE_PRIVATE(NG_HOOK_NODE(sp->hook));
587 uint16_t hash = SESSHASH(sp->Session_ID);
588
589 mtx_lock(&privp->sesshash[hash].mtx);
590 LIST_REMOVE(sp, sessions);
591 mtx_unlock(&privp->sesshash[hash].mtx);
592 }
593
594 /* Find matching peer/session combination. */
595 static sessp
pppoe_findsession(priv_p privp,const struct pppoe_full_hdr * wh)596 pppoe_findsession(priv_p privp, const struct pppoe_full_hdr *wh)
597 {
598 uint16_t session = ntohs(wh->ph.sid);
599 uint16_t hash = SESSHASH(session);
600 sessp sp = NULL;
601
602 mtx_lock(&privp->sesshash[hash].mtx);
603 LIST_FOREACH(sp, &privp->sesshash[hash].head, sessions) {
604 if (sp->Session_ID == session &&
605 bcmp(sp->pkt_hdr.eh.ether_dhost,
606 wh->eh.ether_shost, ETHER_ADDR_LEN) == 0) {
607 break;
608 }
609 }
610 mtx_unlock(&privp->sesshash[hash].mtx);
611 CTR3(KTR_NET, "%20s: matched %p for %d", __func__, sp?sp->hook:NULL,
612 session);
613
614 return (sp);
615 }
616
617 static hook_p
pppoe_finduniq(node_p node,const struct pppoe_tag * tag)618 pppoe_finduniq(node_p node, const struct pppoe_tag *tag)
619 {
620 hook_p hook = NULL;
621 sessp sp;
622
623 /* Cycle through all known hooks. */
624 LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) {
625 /* Skip any nonsession hook. */
626 if (NG_HOOK_PRIVATE(hook) == NULL)
627 continue;
628 sp = NG_HOOK_PRIVATE(hook);
629 /* Skip already connected sessions. */
630 if (sp->neg == NULL)
631 continue;
632 if (sp->neg->host_uniq_len == ntohs(tag->tag_len) &&
633 bcmp(sp->neg->host_uniq.data, (const char *)(tag + 1),
634 sp->neg->host_uniq_len) == 0)
635 break;
636 }
637 CTR3(KTR_NET, "%20s: matched %p for %p", __func__, hook, sp);
638
639 return (hook);
640 }
641
642 static hook_p
pppoe_findcookie(node_p node,const struct pppoe_tag * tag)643 pppoe_findcookie(node_p node, const struct pppoe_tag *tag)
644 {
645 hook_p hook = NULL;
646 union uniq cookie;
647
648 bcopy(tag + 1, cookie.bytes, sizeof(void *));
649 /* Cycle through all known hooks. */
650 LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) {
651 /* Skip any nonsession hook. */
652 if (NG_HOOK_PRIVATE(hook) == NULL)
653 continue;
654 if (cookie.pointer == NG_HOOK_PRIVATE(hook))
655 break;
656 }
657 CTR3(KTR_NET, "%20s: matched %p for %p", __func__, hook, cookie.pointer);
658
659 return (hook);
660 }
661
662 /**************************************************************************
663 * Start of Netgraph entrypoints. *
664 **************************************************************************/
665
666 /*
667 * Allocate the private data structure and link it with node.
668 */
669 static int
ng_pppoe_constructor(node_p node)670 ng_pppoe_constructor(node_p node)
671 {
672 priv_p privp;
673 int i;
674
675 /* Initialize private descriptor. */
676 privp = malloc(sizeof(*privp), M_NETGRAPH_PPPOE, M_WAITOK | M_ZERO);
677
678 /* Link structs together; this counts as our one reference to *node. */
679 NG_NODE_SET_PRIVATE(node, privp);
680 privp->node = node;
681
682 /* Initialize to standard mode. */
683 memset(&privp->eh.ether_dhost, 0xff, ETHER_ADDR_LEN);
684 privp->eh.ether_type = ETHERTYPE_PPPOE_DISC;
685
686 LIST_INIT(&privp->listeners);
687 for (i = 0; i < SESSHASHSIZE; i++) {
688 mtx_init(&privp->sesshash[i].mtx, "PPPoE hash mutex", NULL, MTX_DEF);
689 LIST_INIT(&privp->sesshash[i].head);
690 }
691
692 CTR3(KTR_NET, "%20s: created node [%x] (%p)",
693 __func__, node->nd_ID, node);
694
695 return (0);
696 }
697
698 /*
699 * Give our ok for a hook to be added...
700 * point the hook's private info to the hook structure.
701 *
702 * The following hook names are special:
703 * "ethernet": the hook that should be connected to a NIC.
704 * "debug": copies of data sent out here (when I write the code).
705 * All other hook names need only be unique. (the framework checks this).
706 */
707 static int
ng_pppoe_newhook(node_p node,hook_p hook,const char * name)708 ng_pppoe_newhook(node_p node, hook_p hook, const char *name)
709 {
710 const priv_p privp = NG_NODE_PRIVATE(node);
711 sessp sp;
712
713 if (strcmp(name, NG_PPPOE_HOOK_ETHERNET) == 0) {
714 privp->ethernet_hook = hook;
715 NG_HOOK_SET_RCVDATA(hook, ng_pppoe_rcvdata_ether);
716 } else if (strcmp(name, NG_PPPOE_HOOK_DEBUG) == 0) {
717 privp->debug_hook = hook;
718 NG_HOOK_SET_RCVDATA(hook, ng_pppoe_rcvdata_debug);
719 } else {
720 /*
721 * Any other unique name is OK.
722 * The infrastructure has already checked that it's unique,
723 * so just allocate it and hook it in.
724 */
725 sp = malloc(sizeof(*sp), M_NETGRAPH_PPPOE, M_NOWAIT | M_ZERO);
726 if (sp == NULL)
727 return (ENOMEM);
728
729 NG_HOOK_SET_PRIVATE(hook, sp);
730 sp->hook = hook;
731 }
732 CTR5(KTR_NET, "%20s: node [%x] (%p) connected hook %s (%p)",
733 __func__, node->nd_ID, node, name, hook);
734
735 return(0);
736 }
737
738 /*
739 * Hook has been added successfully. Request the MAC address of
740 * the underlying Ethernet node.
741 */
742 static int
ng_pppoe_connect(hook_p hook)743 ng_pppoe_connect(hook_p hook)
744 {
745 const priv_p privp = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
746 struct ng_mesg *msg;
747 int error;
748
749 if (hook != privp->ethernet_hook)
750 return (0);
751
752 /*
753 * If this is Ethernet hook, then request MAC address
754 * from our downstream.
755 */
756 NG_MKMESSAGE(msg, NGM_ETHER_COOKIE, NGM_ETHER_GET_ENADDR, 0, M_NOWAIT);
757 if (msg == NULL)
758 return (ENOBUFS);
759
760 /*
761 * Our hook and peer hook have HK_INVALID flag set,
762 * so we can't use NG_SEND_MSG_HOOK() macro here.
763 */
764 NG_SEND_MSG_ID(error, privp->node, msg,
765 NG_NODE_ID(NG_PEER_NODE(privp->ethernet_hook)),
766 NG_NODE_ID(privp->node));
767
768 return (error);
769 }
770 /*
771 * Get a netgraph control message.
772 * Check it is one we understand. If needed, send a response.
773 * We sometimes save the address for an async action later.
774 * Always free the message.
775 */
776 static int
ng_pppoe_rcvmsg(node_p node,item_p item,hook_p lasthook)777 ng_pppoe_rcvmsg(node_p node, item_p item, hook_p lasthook)
778 {
779 struct epoch_tracker et;
780 priv_p privp = NG_NODE_PRIVATE(node);
781 struct ngpppoe_init_data *ourmsg = NULL;
782 struct ng_mesg *resp = NULL;
783 int error = 0;
784 hook_p hook = NULL;
785 sessp sp = NULL;
786 negp neg = NULL;
787 struct ng_mesg *msg;
788
789 NGI_GET_MSG(item, msg);
790 CTR5(KTR_NET, "%20s: node [%x] (%p) got message %d with cookie %d",
791 __func__, node->nd_ID, node, msg->header.cmd,
792 msg->header.typecookie);
793
794 /* Deal with message according to cookie and command. */
795 switch (msg->header.typecookie) {
796 case NGM_PPPOE_COOKIE:
797 switch (msg->header.cmd) {
798 case NGM_PPPOE_CONNECT:
799 case NGM_PPPOE_LISTEN:
800 case NGM_PPPOE_OFFER:
801 case NGM_PPPOE_SERVICE:
802 case NGM_PPPOE_SEND_HURL:
803 case NGM_PPPOE_SEND_MOTM:
804 ourmsg = (struct ngpppoe_init_data *)msg->data;
805 if (msg->header.arglen < sizeof(*ourmsg)) {
806 log(LOG_ERR, "ng_pppoe[%x]: init data too "
807 "small\n", node->nd_ID);
808 LEAVE(EMSGSIZE);
809 }
810 if (msg->header.cmd == NGM_PPPOE_SEND_HURL ||
811 msg->header.cmd == NGM_PPPOE_SEND_MOTM) {
812 if (msg->header.arglen - sizeof(*ourmsg) >
813 PPPOE_PADM_VALUE_SIZE) {
814 log(LOG_ERR, "ng_pppoe[%x]: message "
815 "too big\n", node->nd_ID);
816 LEAVE(EMSGSIZE);
817 }
818 } else {
819 if (msg->header.arglen - sizeof(*ourmsg) >
820 PPPOE_SERVICE_NAME_SIZE) {
821 log(LOG_ERR, "ng_pppoe[%x]: service name "
822 "too big\n", node->nd_ID);
823 LEAVE(EMSGSIZE);
824 }
825 }
826 if (msg->header.arglen - sizeof(*ourmsg) <
827 ourmsg->data_len) {
828 log(LOG_ERR, "ng_pppoe[%x]: init data has bad "
829 "length, %d should be %zd\n", node->nd_ID,
830 ourmsg->data_len,
831 msg->header.arglen - sizeof (*ourmsg));
832 LEAVE(EMSGSIZE);
833 }
834
835 /* Make sure strcmp will terminate safely. */
836 ourmsg->hook[sizeof(ourmsg->hook) - 1] = '\0';
837
838 /* Find hook by name. */
839 hook = ng_findhook(node, ourmsg->hook);
840 if (hook == NULL)
841 LEAVE(ENOENT);
842
843 sp = NG_HOOK_PRIVATE(hook);
844 if (sp == NULL)
845 LEAVE(EINVAL);
846
847 if (msg->header.cmd == NGM_PPPOE_LISTEN) {
848 /*
849 * Ensure we aren't already listening for this
850 * service.
851 */
852 if (pppoe_find_svc(node, ourmsg->data,
853 ourmsg->data_len) != NULL)
854 LEAVE(EEXIST);
855 }
856
857 /*
858 * PPPOE_SERVICE advertisements are set up
859 * on sessions that are in PRIMED state.
860 */
861 if (msg->header.cmd == NGM_PPPOE_SERVICE)
862 break;
863
864 /*
865 * PADM messages are set up on active sessions.
866 */
867 if (msg->header.cmd == NGM_PPPOE_SEND_HURL ||
868 msg->header.cmd == NGM_PPPOE_SEND_MOTM) {
869 if (sp->state != PPPOE_NEWCONNECTED &&
870 sp->state != PPPOE_CONNECTED) {
871 log(LOG_NOTICE, "ng_pppoe[%x]: session is not "
872 "active\n", node->nd_ID);
873 LEAVE(EISCONN);
874 }
875 break;
876 }
877
878 if (sp->state != PPPOE_SNONE) {
879 log(LOG_NOTICE, "ng_pppoe[%x]: Session already "
880 "active\n", node->nd_ID);
881 LEAVE(EISCONN);
882 }
883
884 /*
885 * Set up prototype header.
886 */
887 neg = malloc(sizeof(*neg), M_NETGRAPH_PPPOE,
888 M_NOWAIT | M_ZERO);
889
890 if (neg == NULL)
891 LEAVE(ENOMEM);
892
893 neg->m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
894 if (neg->m == NULL) {
895 free(neg, M_NETGRAPH_PPPOE);
896 LEAVE(ENOBUFS);
897 }
898 neg->m->m_pkthdr.rcvif = NULL;
899 sp->neg = neg;
900 ng_callout_init(&neg->handle);
901 neg->m->m_len = sizeof(struct pppoe_full_hdr);
902 neg->pkt = mtod(neg->m, union packet*);
903 memcpy((void *)&neg->pkt->pkt_header.eh,
904 &privp->eh, sizeof(struct ether_header));
905 neg->pkt->pkt_header.ph.ver = 0x1;
906 neg->pkt->pkt_header.ph.type = 0x1;
907 neg->pkt->pkt_header.ph.sid = 0x0000;
908 neg->timeout = 0;
909
910 sp->creator = NGI_RETADDR(item);
911 }
912 switch (msg->header.cmd) {
913 case NGM_PPPOE_GET_STATUS:
914 {
915 struct ngpppoestat *stats;
916
917 NG_MKRESPONSE(resp, msg, sizeof(*stats), M_NOWAIT);
918 if (!resp)
919 LEAVE(ENOMEM);
920
921 stats = (struct ngpppoestat *) resp->data;
922 stats->packets_in = privp->packets_in;
923 stats->packets_out = privp->packets_out;
924 break;
925 }
926 case NGM_PPPOE_CONNECT:
927 {
928 /*
929 * Check the hook exists and is Uninitialised.
930 * Send a PADI request, and start the timeout logic.
931 * Store the originator of this message so we can send
932 * a success or fail message to them later.
933 * Move the session to SINIT.
934 * Set up the session to the correct state and
935 * start it.
936 */
937 int acnpos, acnlen = 0, acnsep = 0;
938 int hupos, hulen = 0, husep = 0;
939 int i, srvpos, srvlen;
940 acnpos = 0;
941 for (i = 0; i < ourmsg->data_len; i++) {
942 if (ourmsg->data[i] == '\\') {
943 acnlen = i;
944 acnsep = 1;
945 break;
946 }
947 }
948 hupos = acnlen + acnsep;
949 for (i = hupos; i < ourmsg->data_len; i++) {
950 if (ourmsg->data[i] == '|') {
951 hulen = i - hupos;
952 husep = 1;
953 break;
954 }
955 }
956 srvpos = hupos + hulen + husep;
957 srvlen = ourmsg->data_len - srvpos;
958
959 bcopy(ourmsg->data + acnpos, neg->ac_name.data, acnlen);
960 neg->ac_name_len = acnlen;
961
962 neg->host_uniq.hdr.tag_type = PTT_HOST_UNIQ;
963 if (hulen == 0) {
964 /* Not provided, generate one */
965 neg->host_uniq.hdr.tag_len = htons(sizeof(sp));
966 bcopy(&sp, neg->host_uniq.data, sizeof(sp));
967 neg->host_uniq_len = sizeof(sp);
968 } else if (hulen > 2 && ourmsg->data[hupos] == '0' &&
969 ourmsg->data[hupos + 1] == 'x' && hulen % 2 == 0) {
970 /* Hex encoded */
971 static const char hexdig[16] = "0123456789abcdef";
972 int j;
973
974 neg->host_uniq.hdr.tag_len = htons((uint16_t)(hulen / 2 - 1));
975 for (i = 0; i < hulen - 2; i++) {
976 for (j = 0;
977 j < 16 &&
978 ourmsg->data[hupos + 2 + i] != hexdig[j];
979 j++);
980 if (j == 16)
981 LEAVE(EINVAL);
982 if (i % 2 == 0)
983 neg->host_uniq.data[i / 2] = j << 4;
984 else
985 neg->host_uniq.data[i / 2] |= j;
986 }
987 neg->host_uniq_len = hulen / 2 - 1;
988 } else {
989 /* Plain string */
990 neg->host_uniq.hdr.tag_len = htons((uint16_t)hulen);
991 bcopy(ourmsg->data + hupos, neg->host_uniq.data, hulen);
992 neg->host_uniq_len = hulen;
993 }
994
995 neg->service.hdr.tag_type = PTT_SRV_NAME;
996 neg->service.hdr.tag_len = htons((uint16_t)srvlen);
997 bcopy(ourmsg->data + srvpos, neg->service.data, srvlen);
998 neg->service_len = srvlen;
999 NET_EPOCH_ENTER(et);
1000 pppoe_start(sp);
1001 NET_EPOCH_EXIT(et);
1002 break;
1003 }
1004 case NGM_PPPOE_LISTEN:
1005 /*
1006 * Check the hook exists and is Uninitialised.
1007 * Install the service matching string.
1008 * Store the originator of this message so we can send
1009 * a success or fail message to them later.
1010 * Move the hook to 'LISTENING'
1011 */
1012 neg->service.hdr.tag_type = PTT_SRV_NAME;
1013 neg->service.hdr.tag_len =
1014 htons((uint16_t)ourmsg->data_len);
1015
1016 if (ourmsg->data_len)
1017 bcopy(ourmsg->data, neg->service.data,
1018 ourmsg->data_len);
1019 neg->service_len = ourmsg->data_len;
1020 neg->pkt->pkt_header.ph.code = PADT_CODE;
1021 /*
1022 * Wait for PADI packet coming from Ethernet.
1023 */
1024 sp->state = PPPOE_LISTENING;
1025 LIST_INSERT_HEAD(&privp->listeners, sp, sessions);
1026 break;
1027 case NGM_PPPOE_OFFER:
1028 /*
1029 * Check the hook exists and is Uninitialised.
1030 * Store the originator of this message so we can send
1031 * a success of fail message to them later.
1032 * Store the AC-Name given and go to PRIMED.
1033 */
1034 neg->ac_name.hdr.tag_type = PTT_AC_NAME;
1035 neg->ac_name.hdr.tag_len =
1036 htons((uint16_t)ourmsg->data_len);
1037 if (ourmsg->data_len)
1038 bcopy(ourmsg->data, neg->ac_name.data,
1039 ourmsg->data_len);
1040 neg->ac_name_len = ourmsg->data_len;
1041 neg->pkt->pkt_header.ph.code = PADO_CODE;
1042 /*
1043 * Wait for PADI packet coming from hook.
1044 */
1045 sp->state = PPPOE_PRIMED;
1046 break;
1047 case NGM_PPPOE_SERVICE:
1048 /*
1049 * Check the session is primed.
1050 * for now just allow ONE service to be advertised.
1051 * If you do it twice you just overwrite.
1052 */
1053 if (sp->state != PPPOE_PRIMED) {
1054 log(LOG_NOTICE, "ng_pppoe[%x]: session not "
1055 "primed\n", node->nd_ID);
1056 LEAVE(EISCONN);
1057 }
1058 neg = sp->neg;
1059 neg->service.hdr.tag_type = PTT_SRV_NAME;
1060 neg->service.hdr.tag_len =
1061 htons((uint16_t)ourmsg->data_len);
1062
1063 if (ourmsg->data_len)
1064 bcopy(ourmsg->data, neg->service.data,
1065 ourmsg->data_len);
1066 neg->service_len = ourmsg->data_len;
1067 break;
1068 case NGM_PPPOE_SETMODE:
1069 {
1070 char *s;
1071 size_t len;
1072
1073 if (msg->header.arglen == 0)
1074 LEAVE(EINVAL);
1075
1076 s = (char *)msg->data;
1077 len = msg->header.arglen - 1;
1078
1079 /* Search for matching mode string. */
1080 if (len == strlen(NG_PPPOE_STANDARD) &&
1081 (strncmp(NG_PPPOE_STANDARD, s, len) == 0)) {
1082 privp->flags = 0;
1083 privp->eh.ether_type = ETHERTYPE_PPPOE_DISC;
1084 break;
1085 }
1086 if (len == strlen(NG_PPPOE_3COM) &&
1087 (strncmp(NG_PPPOE_3COM, s, len) == 0)) {
1088 privp->flags |= COMPAT_3COM;
1089 privp->eh.ether_type =
1090 ETHERTYPE_PPPOE_3COM_DISC;
1091 break;
1092 }
1093 if (len == strlen(NG_PPPOE_DLINK) &&
1094 (strncmp(NG_PPPOE_DLINK, s, len) == 0)) {
1095 privp->flags |= COMPAT_DLINK;
1096 break;
1097 }
1098 error = EINVAL;
1099 break;
1100 }
1101 case NGM_PPPOE_GETMODE:
1102 {
1103 char *s;
1104 size_t len = 0;
1105
1106 if (privp->flags == 0)
1107 len += strlen(NG_PPPOE_STANDARD) + 1;
1108 if (privp->flags & COMPAT_3COM)
1109 len += strlen(NG_PPPOE_3COM) + 1;
1110 if (privp->flags & COMPAT_DLINK)
1111 len += strlen(NG_PPPOE_DLINK) + 1;
1112
1113 NG_MKRESPONSE(resp, msg, len, M_NOWAIT);
1114 if (resp == NULL)
1115 LEAVE(ENOMEM);
1116
1117 s = (char *)resp->data;
1118 if (privp->flags == 0) {
1119 len = strlen(NG_PPPOE_STANDARD);
1120 strlcpy(s, NG_PPPOE_STANDARD, len + 1);
1121 break;
1122 }
1123 if (privp->flags & COMPAT_3COM) {
1124 len = strlen(NG_PPPOE_3COM);
1125 strlcpy(s, NG_PPPOE_3COM, len + 1);
1126 s += len;
1127 }
1128 if (privp->flags & COMPAT_DLINK) {
1129 if (s != resp->data)
1130 *s++ = '|';
1131 len = strlen(NG_PPPOE_DLINK);
1132 strlcpy(s, NG_PPPOE_DLINK, len + 1);
1133 }
1134 break;
1135 }
1136 case NGM_PPPOE_SETENADDR:
1137 if (msg->header.arglen != ETHER_ADDR_LEN)
1138 LEAVE(EINVAL);
1139 bcopy(msg->data, &privp->eh.ether_shost,
1140 ETHER_ADDR_LEN);
1141 break;
1142 case NGM_PPPOE_SETMAXP:
1143 if (msg->header.arglen != sizeof(uint16_t))
1144 LEAVE(EINVAL);
1145 privp->max_payload.hdr.tag_type = PTT_MAX_PAYL;
1146 privp->max_payload.hdr.tag_len = htons(sizeof(uint16_t));
1147 privp->max_payload.data = htons(*((uint16_t *)msg->data));
1148 break;
1149 case NGM_PPPOE_SEND_HURL:
1150 {
1151 struct mbuf *m;
1152
1153 /* Generate a packet of that type. */
1154 m = m_gethdr(M_NOWAIT, MT_DATA);
1155 if (m == NULL)
1156 log(LOG_NOTICE, "ng_pppoe[%x]: session out of "
1157 "mbufs\n", node->nd_ID);
1158 else {
1159 struct pppoe_full_hdr *wh;
1160 struct pppoe_tag *tag;
1161 int error = 0;
1162
1163 wh = mtod(m, struct pppoe_full_hdr *);
1164 bcopy(&sp->pkt_hdr, wh, sizeof(*wh));
1165
1166 /* Revert the stored header to DISC/PADM mode. */
1167 wh->ph.code = PADM_CODE;
1168 /*
1169 * Configure ethertype depending on what
1170 * was used during sessions stage.
1171 */
1172 if (wh->eh.ether_type ==
1173 ETHERTYPE_PPPOE_3COM_SESS)
1174 wh->eh.ether_type = ETHERTYPE_PPPOE_3COM_DISC;
1175 else
1176 wh->eh.ether_type = ETHERTYPE_PPPOE_DISC;
1177 /*
1178 * Add PADM message and adjust sizes.
1179 */
1180 tag = (void *)(&wh->ph + 1);
1181 tag->tag_type = PTT_HURL;
1182 tag->tag_len = htons(ourmsg->data_len);
1183 strncpy((char *)(tag + 1), ourmsg->data, ourmsg->data_len);
1184 m->m_pkthdr.len = m->m_len = sizeof(*wh) + sizeof(*tag) +
1185 ourmsg->data_len;
1186 wh->ph.length = htons(sizeof(*tag) + ourmsg->data_len);
1187 NET_EPOCH_ENTER(et);
1188 NG_SEND_DATA_ONLY(error,
1189 privp->ethernet_hook, m);
1190 NET_EPOCH_EXIT(et);
1191 }
1192 break;
1193 }
1194 case NGM_PPPOE_SEND_MOTM:
1195 {
1196 struct mbuf *m;
1197
1198 /* Generate a packet of that type. */
1199 m = m_gethdr(M_NOWAIT, MT_DATA);
1200 if (m == NULL)
1201 log(LOG_NOTICE, "ng_pppoe[%x]: session out of "
1202 "mbufs\n", node->nd_ID);
1203 else {
1204 struct pppoe_full_hdr *wh;
1205 struct pppoe_tag *tag;
1206 int error = 0;
1207
1208 wh = mtod(m, struct pppoe_full_hdr *);
1209 bcopy(&sp->pkt_hdr, wh, sizeof(*wh));
1210
1211 /* Revert the stored header to DISC/PADM mode. */
1212 wh->ph.code = PADM_CODE;
1213 /*
1214 * Configure ethertype depending on what
1215 * was used during sessions stage.
1216 */
1217 if (wh->eh.ether_type ==
1218 ETHERTYPE_PPPOE_3COM_SESS)
1219 wh->eh.ether_type = ETHERTYPE_PPPOE_3COM_DISC;
1220 else
1221 wh->eh.ether_type = ETHERTYPE_PPPOE_DISC;
1222 /*
1223 * Add PADM message and adjust sizes.
1224 */
1225 tag = (void *)(&wh->ph + 1);
1226 tag->tag_type = PTT_MOTM;
1227 tag->tag_len = htons(ourmsg->data_len);
1228 strncpy((char *)(tag + 1), ourmsg->data, ourmsg->data_len);
1229 m->m_pkthdr.len = m->m_len = sizeof(*wh) + sizeof(*tag) +
1230 ourmsg->data_len;
1231 wh->ph.length = htons(sizeof(*tag) + ourmsg->data_len);
1232 NET_EPOCH_ENTER(et);
1233 NG_SEND_DATA_ONLY(error,
1234 privp->ethernet_hook, m);
1235 NET_EPOCH_EXIT(et);
1236 }
1237 break;
1238 }
1239 default:
1240 LEAVE(EINVAL);
1241 }
1242 break;
1243 case NGM_ETHER_COOKIE:
1244 if (!(msg->header.flags & NGF_RESP))
1245 LEAVE(EINVAL);
1246 switch (msg->header.cmd) {
1247 case NGM_ETHER_GET_ENADDR:
1248 if (msg->header.arglen != ETHER_ADDR_LEN)
1249 LEAVE(EINVAL);
1250 bcopy(msg->data, &privp->eh.ether_shost,
1251 ETHER_ADDR_LEN);
1252 break;
1253 default:
1254 LEAVE(EINVAL);
1255 }
1256 break;
1257 default:
1258 LEAVE(EINVAL);
1259 }
1260
1261 /* Take care of synchronous response, if any. */
1262 quit:
1263 CTR2(KTR_NET, "%20s: returning %d", __func__, error);
1264 NG_RESPOND_MSG(error, node, item, resp);
1265 /* Free the message and return. */
1266 NG_FREE_MSG(msg);
1267 return(error);
1268 }
1269
1270 /*
1271 * Start a client into the first state. A separate function because
1272 * it can be needed if the negotiation times out.
1273 */
1274 static void
pppoe_start(sessp sp)1275 pppoe_start(sessp sp)
1276 {
1277 hook_p hook = sp->hook;
1278 node_p node = NG_HOOK_NODE(hook);
1279 priv_p privp = NG_NODE_PRIVATE(node);
1280 negp neg = sp->neg;
1281 struct mbuf *m0;
1282 int error;
1283
1284 /*
1285 * Kick the state machine into starting up.
1286 */
1287 CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID);
1288 sp->state = PPPOE_SINIT;
1289 /*
1290 * Reset the packet header to broadcast. Since we are
1291 * in a client mode use configured ethertype.
1292 */
1293 memcpy((void *)&neg->pkt->pkt_header.eh, &privp->eh,
1294 sizeof(struct ether_header));
1295 neg->pkt->pkt_header.ph.code = PADI_CODE;
1296 init_tags(sp);
1297 insert_tag(sp, &neg->host_uniq.hdr);
1298 insert_tag(sp, &neg->service.hdr);
1299 if (privp->max_payload.data != 0)
1300 insert_tag(sp, &privp->max_payload.hdr);
1301 make_packet(sp);
1302 /*
1303 * Send packet and prepare to retransmit it after timeout.
1304 */
1305 ng_callout(&neg->handle, node, hook, PPPOE_INITIAL_TIMEOUT * hz,
1306 pppoe_ticker, NULL, 0);
1307 neg->timeout = PPPOE_INITIAL_TIMEOUT * 2;
1308 m0 = m_copypacket(neg->m, M_NOWAIT);
1309 NG_SEND_DATA_ONLY(error, privp->ethernet_hook, m0);
1310 }
1311
1312 static int
send_acname(sessp sp,const struct pppoe_tag * tag)1313 send_acname(sessp sp, const struct pppoe_tag *tag)
1314 {
1315 int error, tlen;
1316 struct ng_mesg *msg;
1317 struct ngpppoe_sts *sts;
1318
1319 CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID);
1320
1321 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_ACNAME,
1322 sizeof(struct ngpppoe_sts), M_NOWAIT);
1323 if (msg == NULL)
1324 return (ENOMEM);
1325
1326 sts = (struct ngpppoe_sts *)msg->data;
1327 tlen = min(NG_HOOKSIZ - 1, ntohs(tag->tag_len));
1328 strncpy(sts->hook, (const char *)(tag + 1), tlen);
1329 sts->hook[tlen] = '\0';
1330 NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0);
1331
1332 return (error);
1333 }
1334
1335 static int
send_sessionid(sessp sp)1336 send_sessionid(sessp sp)
1337 {
1338 int error;
1339 struct ng_mesg *msg;
1340
1341 CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID);
1342
1343 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_SESSIONID,
1344 sizeof(uint16_t), M_NOWAIT);
1345 if (msg == NULL)
1346 return (ENOMEM);
1347
1348 *(uint16_t *)msg->data = sp->Session_ID;
1349 NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0);
1350
1351 return (error);
1352 }
1353
1354 static int
send_maxp(sessp sp,const struct pppoe_tag * tag)1355 send_maxp(sessp sp, const struct pppoe_tag *tag)
1356 {
1357 int error;
1358 struct ng_mesg *msg;
1359 struct ngpppoe_maxp *maxp;
1360
1361 CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID);
1362
1363 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_SETMAXP,
1364 sizeof(struct ngpppoe_maxp), M_NOWAIT);
1365 if (msg == NULL)
1366 return (ENOMEM);
1367
1368 maxp = (struct ngpppoe_maxp *)msg->data;
1369 strncpy(maxp->hook, NG_HOOK_NAME(sp->hook), NG_HOOKSIZ);
1370 maxp->data = ntohs(((const struct maxptag *)tag)->data);
1371 NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0);
1372
1373 return (error);
1374 }
1375
1376 static int
send_hurl(sessp sp,const struct pppoe_tag * tag)1377 send_hurl(sessp sp, const struct pppoe_tag *tag)
1378 {
1379 int error, tlen;
1380 struct ng_mesg *msg;
1381 struct ngpppoe_padm *padm;
1382
1383 CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID);
1384
1385 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_HURL,
1386 sizeof(struct ngpppoe_padm), M_NOWAIT);
1387 if (msg == NULL)
1388 return (ENOMEM);
1389
1390 padm = (struct ngpppoe_padm *)msg->data;
1391 tlen = min(PPPOE_PADM_VALUE_SIZE - 1, ntohs(tag->tag_len));
1392 strncpy(padm->msg, (const char *)(tag + 1), tlen);
1393 padm->msg[tlen] = '\0';
1394 NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0);
1395
1396 return (error);
1397 }
1398
1399 static int
send_motm(sessp sp,const struct pppoe_tag * tag)1400 send_motm(sessp sp, const struct pppoe_tag *tag)
1401 {
1402 int error, tlen;
1403 struct ng_mesg *msg;
1404 struct ngpppoe_padm *padm;
1405
1406 CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID);
1407
1408 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_MOTM,
1409 sizeof(struct ngpppoe_padm), M_NOWAIT);
1410 if (msg == NULL)
1411 return (ENOMEM);
1412
1413 padm = (struct ngpppoe_padm *)msg->data;
1414 tlen = min(PPPOE_PADM_VALUE_SIZE - 1, ntohs(tag->tag_len));
1415 strncpy(padm->msg, (const char *)(tag + 1), tlen);
1416 padm->msg[tlen] = '\0';
1417 NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0);
1418
1419 return (error);
1420 }
1421
1422 /*
1423 * Receive data from session hook and do something with it.
1424 */
1425 static int
ng_pppoe_rcvdata(hook_p hook,item_p item)1426 ng_pppoe_rcvdata(hook_p hook, item_p item)
1427 {
1428 node_p node = NG_HOOK_NODE(hook);
1429 const priv_p privp = NG_NODE_PRIVATE(node);
1430 sessp sp = NG_HOOK_PRIVATE(hook);
1431 struct pppoe_full_hdr *wh;
1432 struct mbuf *m;
1433 int error;
1434
1435 CTR6(KTR_NET, "%20s: node [%x] (%p) received %p on \"%s\" (%p)",
1436 __func__, node->nd_ID, node, item, hook->hk_name, hook);
1437
1438 NGI_GET_M(item, m);
1439 switch (sp->state) {
1440 case PPPOE_NEWCONNECTED:
1441 case PPPOE_CONNECTED: {
1442 /*
1443 * Remove PPP address and control fields, if any.
1444 * For example, ng_ppp(4) always sends LCP packets
1445 * with address and control fields as required by
1446 * generic PPP. PPPoE is an exception to the rule.
1447 */
1448 if (m->m_pkthdr.len >= 2) {
1449 if (m->m_len < 2 && !(m = m_pullup(m, 2)))
1450 LEAVE(ENOBUFS);
1451 if (mtod(m, u_char *)[0] == 0xff &&
1452 mtod(m, u_char *)[1] == 0x03)
1453 m_adj(m, 2);
1454 }
1455
1456 if (V_ng_pppoe_lcp_pcp && m->m_pkthdr.len >= 2 &&
1457 m->m_len >= 2 && (m = m_pullup(m, 2)) &&
1458 mtod(m, uint16_t *)[0] == htons(PROT_LCP))
1459 EVL_APPLY_PRI(m, (uint8_t)(V_ng_pppoe_lcp_pcp & 0x7));
1460
1461 /*
1462 * Bang in a pre-made header, and set the length up
1463 * to be correct. Then send it to the ethernet driver.
1464 */
1465 M_PREPEND(m, sizeof(*wh), M_NOWAIT);
1466 if (m == NULL)
1467 LEAVE(ENOBUFS);
1468
1469 wh = mtod(m, struct pppoe_full_hdr *);
1470 bcopy(&sp->pkt_hdr, wh, sizeof(*wh));
1471 wh->ph.length = htons(m->m_pkthdr.len - sizeof(*wh));
1472 NG_FWD_NEW_DATA(error, item, privp->ethernet_hook, m);
1473 privp->packets_out++;
1474 break;
1475 }
1476 case PPPOE_PRIMED: {
1477 struct {
1478 struct pppoe_tag hdr;
1479 union uniq data;
1480 } __packed uniqtag;
1481 const struct pppoe_tag *tag;
1482 struct mbuf *m0;
1483 const struct pppoe_hdr *ph;
1484 negp neg = sp->neg;
1485 uint8_t code;
1486
1487 /*
1488 * A PADI packet is being returned by the application
1489 * that has set up this hook. This indicates that it
1490 * wants us to offer service.
1491 */
1492 if (m->m_len < sizeof(*wh)) {
1493 m = m_pullup(m, sizeof(*wh));
1494 if (m == NULL)
1495 LEAVE(ENOBUFS);
1496 }
1497 wh = mtod(m, struct pppoe_full_hdr *);
1498 ph = &wh->ph;
1499 code = wh->ph.code;
1500 /* Use peers mode in session. */
1501 neg->pkt->pkt_header.eh.ether_type = wh->eh.ether_type;
1502 if (code != PADI_CODE)
1503 LEAVE(EINVAL);
1504 ng_uncallout(&neg->handle, node);
1505
1506 /*
1507 * This is the first time we hear
1508 * from the client, so note it's
1509 * unicast address, replacing the
1510 * broadcast address.
1511 */
1512 bcopy(wh->eh.ether_shost,
1513 neg->pkt->pkt_header.eh.ether_dhost,
1514 ETHER_ADDR_LEN);
1515 sp->state = PPPOE_SOFFER;
1516 neg->timeout = 0;
1517 neg->pkt->pkt_header.ph.code = PADO_CODE;
1518
1519 /*
1520 * Start working out the tags to respond with.
1521 */
1522 uniqtag.hdr.tag_type = PTT_AC_COOKIE;
1523 uniqtag.hdr.tag_len = htons((u_int16_t)sizeof(sp));
1524 uniqtag.data.pointer = sp;
1525 init_tags(sp);
1526 insert_tag(sp, &neg->ac_name.hdr); /* AC_NAME */
1527 if ((tag = get_tag(ph, PTT_SRV_NAME)))
1528 insert_tag(sp, tag); /* return service */
1529 /*
1530 * If we have a NULL service request
1531 * and have an extra service defined in this hook,
1532 * then also add a tag for the extra service.
1533 * XXX this is a hack. eventually we should be able
1534 * to support advertising many services, not just one
1535 */
1536 if (((tag == NULL) || (tag->tag_len == 0)) &&
1537 (neg->service.hdr.tag_len != 0)) {
1538 insert_tag(sp, &neg->service.hdr); /* SERVICE */
1539 }
1540 if ((tag = get_tag(ph, PTT_HOST_UNIQ)))
1541 insert_tag(sp, tag); /* returned hostunique */
1542 insert_tag(sp, &uniqtag.hdr);
1543 scan_tags(sp, ph);
1544 make_packet(sp);
1545 /*
1546 * Send the offer but if they don't respond
1547 * in PPPOE_OFFER_TIMEOUT seconds, forget about it.
1548 */
1549 ng_callout(&neg->handle, node, hook, PPPOE_OFFER_TIMEOUT * hz,
1550 pppoe_ticker, NULL, 0);
1551 m0 = m_copypacket(sp->neg->m, M_NOWAIT);
1552 NG_FWD_NEW_DATA(error, item, privp->ethernet_hook, m0);
1553 privp->packets_out++;
1554 break;
1555 }
1556
1557 /*
1558 * Packets coming from the hook make no sense
1559 * to sessions in the rest of states. Throw them away.
1560 */
1561 default:
1562 LEAVE(ENETUNREACH);
1563 }
1564 quit:
1565 if (item)
1566 NG_FREE_ITEM(item);
1567 NG_FREE_M(m);
1568 return (error);
1569 }
1570
1571 /*
1572 * Receive data from ether and do something with it.
1573 */
1574 static int
ng_pppoe_rcvdata_ether(hook_p hook,item_p item)1575 ng_pppoe_rcvdata_ether(hook_p hook, item_p item)
1576 {
1577 node_p node = NG_HOOK_NODE(hook);
1578 const priv_p privp = NG_NODE_PRIVATE(node);
1579 sessp sp;
1580 const struct pppoe_tag *utag = NULL, *tag = NULL;
1581 const struct pppoe_tag sntag = { PTT_SRV_NAME, 0 };
1582 const struct pppoe_full_hdr *wh;
1583 const struct pppoe_hdr *ph;
1584 negp neg = NULL;
1585 struct mbuf *m;
1586 hook_p sendhook;
1587 int error = 0;
1588 uint16_t length;
1589 uint8_t code;
1590 struct mbuf *m0;
1591
1592 CTR6(KTR_NET, "%20s: node [%x] (%p) received %p on \"%s\" (%p)",
1593 __func__, node->nd_ID, node, item, hook->hk_name, hook);
1594
1595 NGI_GET_M(item, m);
1596 /*
1597 * Dig out various fields from the packet.
1598 * Use them to decide where to send it.
1599 */
1600 privp->packets_in++;
1601 if( m->m_len < sizeof(*wh)) {
1602 m = m_pullup(m, sizeof(*wh)); /* Checks length */
1603 if (m == NULL) {
1604 log(LOG_NOTICE, "ng_pppoe[%x]: couldn't "
1605 "m_pullup(wh)\n", node->nd_ID);
1606 LEAVE(ENOBUFS);
1607 }
1608 }
1609 wh = mtod(m, struct pppoe_full_hdr *);
1610 length = ntohs(wh->ph.length);
1611 switch(wh->eh.ether_type) {
1612 case ETHERTYPE_PPPOE_3COM_DISC: /* fall through */
1613 case ETHERTYPE_PPPOE_DISC:
1614 /*
1615 * We need to try to make sure that the tag area
1616 * is contiguous, or we could wander off the end
1617 * of a buffer and make a mess.
1618 * (Linux wouldn't have this problem).
1619 */
1620 if (m->m_pkthdr.len <= MHLEN) {
1621 if( m->m_len < m->m_pkthdr.len) {
1622 m = m_pullup(m, m->m_pkthdr.len);
1623 if (m == NULL) {
1624 log(LOG_NOTICE, "ng_pppoe[%x]: "
1625 "couldn't m_pullup(pkthdr)\n",
1626 node->nd_ID);
1627 LEAVE(ENOBUFS);
1628 }
1629 }
1630 }
1631 if (m->m_len != m->m_pkthdr.len) {
1632 /*
1633 * It's not all in one piece.
1634 * We need to do extra work.
1635 * Put it into a cluster.
1636 */
1637 struct mbuf *n;
1638 n = m_dup(m, M_NOWAIT);
1639 m_freem(m);
1640 m = n;
1641 if (m) {
1642 /* just check we got a cluster */
1643 if (m->m_len != m->m_pkthdr.len) {
1644 m_freem(m);
1645 m = NULL;
1646 }
1647 }
1648 if (m == NULL) {
1649 log(LOG_NOTICE, "ng_pppoe[%x]: packet "
1650 "fragmented\n", node->nd_ID);
1651 LEAVE(EMSGSIZE);
1652 }
1653 }
1654 wh = mtod(m, struct pppoe_full_hdr *);
1655 length = ntohs(wh->ph.length);
1656 ph = &wh->ph;
1657 code = wh->ph.code;
1658
1659 switch(code) {
1660 case PADI_CODE:
1661 /*
1662 * We are a server:
1663 * Look for a hook with the required service and send
1664 * the ENTIRE packet up there. It should come back to
1665 * a new hook in PRIMED state. Look there for further
1666 * processing.
1667 */
1668 tag = get_tag(ph, PTT_SRV_NAME);
1669 if (tag == NULL)
1670 tag = &sntag;
1671
1672 /*
1673 * First, try to match Service-Name against our
1674 * listening hooks. If no success and we are in D-Link
1675 * compat mode and Service-Name is empty, then we
1676 * broadcast the PADI to all listening hooks.
1677 */
1678 sendhook = pppoe_match_svc(node, tag);
1679 if (sendhook != NULL)
1680 NG_FWD_NEW_DATA(error, item, sendhook, m);
1681 else if (privp->flags & COMPAT_DLINK &&
1682 ntohs(tag->tag_len) == 0)
1683 error = pppoe_broadcast_padi(node, m);
1684 else
1685 error = ENETUNREACH;
1686 break;
1687 case PADO_CODE:
1688 /*
1689 * We are a client:
1690 * Use the host_uniq tag to find the hook this is in
1691 * response to. Received #2, now send #3
1692 * For now simply accept the first we receive.
1693 */
1694 utag = get_tag(ph, PTT_HOST_UNIQ);
1695 if (utag == NULL) {
1696 log(LOG_NOTICE, "ng_pppoe[%x]: no host "
1697 "unique field\n", node->nd_ID);
1698 LEAVE(ENETUNREACH);
1699 }
1700
1701 sendhook = pppoe_finduniq(node, utag);
1702 if (sendhook == NULL) {
1703 log(LOG_NOTICE, "ng_pppoe[%x]: no "
1704 "matching session\n", node->nd_ID);
1705 LEAVE(ENETUNREACH);
1706 }
1707
1708 /*
1709 * Check the session is in the right state.
1710 * It needs to be in PPPOE_SINIT.
1711 */
1712 sp = NG_HOOK_PRIVATE(sendhook);
1713 if (sp->state == PPPOE_SREQ ||
1714 sp->state == PPPOE_CONNECTED) {
1715 break; /* Multiple PADO is OK. */
1716 }
1717 if (sp->state != PPPOE_SINIT) {
1718 log(LOG_NOTICE, "ng_pppoe[%x]: session "
1719 "in wrong state\n", node->nd_ID);
1720 LEAVE(ENETUNREACH);
1721 }
1722 neg = sp->neg;
1723 /* If requested specific AC-name, check it. */
1724 if (neg->ac_name_len) {
1725 tag = get_tag(ph, PTT_AC_NAME);
1726 if (!tag) {
1727 /* No PTT_AC_NAME in PADO */
1728 break;
1729 }
1730 if (neg->ac_name_len != htons(tag->tag_len) ||
1731 strncmp(neg->ac_name.data,
1732 (const char *)(tag + 1),
1733 neg->ac_name_len) != 0) {
1734 break;
1735 }
1736 }
1737 sp->state = PPPOE_SREQ;
1738 ng_uncallout(&neg->handle, node);
1739
1740 /*
1741 * This is the first time we hear
1742 * from the server, so note it's
1743 * unicast address, replacing the
1744 * broadcast address .
1745 */
1746 bcopy(wh->eh.ether_shost,
1747 neg->pkt->pkt_header.eh.ether_dhost,
1748 ETHER_ADDR_LEN);
1749 neg->timeout = 0;
1750 neg->pkt->pkt_header.ph.code = PADR_CODE;
1751 init_tags(sp);
1752 insert_tag(sp, utag); /* Host Unique */
1753 if ((tag = get_tag(ph, PTT_AC_COOKIE)))
1754 insert_tag(sp, tag); /* return cookie */
1755 if ((tag = get_tag(ph, PTT_AC_NAME))) {
1756 insert_tag(sp, tag); /* return it */
1757 send_acname(sp, tag);
1758 }
1759 if ((tag = get_tag(ph, PTT_MAX_PAYL)) &&
1760 (privp->max_payload.data != 0))
1761 insert_tag(sp, tag); /* return it */
1762 insert_tag(sp, &neg->service.hdr); /* Service */
1763 scan_tags(sp, ph);
1764 make_packet(sp);
1765 sp->state = PPPOE_SREQ;
1766 ng_callout(&neg->handle, node, sp->hook,
1767 PPPOE_INITIAL_TIMEOUT * hz,
1768 pppoe_ticker, NULL, 0);
1769 neg->timeout = PPPOE_INITIAL_TIMEOUT * 2;
1770 m0 = m_copypacket(neg->m, M_NOWAIT);
1771 NG_FWD_NEW_DATA(error, item, privp->ethernet_hook, m0);
1772 break;
1773 case PADR_CODE:
1774 /*
1775 * We are a server:
1776 * Use the ac_cookie tag to find the
1777 * hook this is in response to.
1778 */
1779 utag = get_tag(ph, PTT_AC_COOKIE);
1780 if ((utag == NULL) ||
1781 (ntohs(utag->tag_len) != sizeof(sp))) {
1782 LEAVE(ENETUNREACH);
1783 }
1784
1785 sendhook = pppoe_findcookie(node, utag);
1786 if (sendhook == NULL)
1787 LEAVE(ENETUNREACH);
1788
1789 /*
1790 * Check the session is in the right state.
1791 * It needs to be in PPPOE_SOFFER or PPPOE_NEWCONNECTED.
1792 * If the latter, then this is a retry by the client,
1793 * so be nice, and resend.
1794 */
1795 sp = NG_HOOK_PRIVATE(sendhook);
1796 if (sp->state == PPPOE_NEWCONNECTED) {
1797 /*
1798 * Whoa! drop back to resend that PADS packet.
1799 * We should still have a copy of it.
1800 */
1801 sp->state = PPPOE_SOFFER;
1802 } else if (sp->state != PPPOE_SOFFER)
1803 LEAVE (ENETUNREACH);
1804 neg = sp->neg;
1805 ng_uncallout(&neg->handle, node);
1806 neg->pkt->pkt_header.ph.code = PADS_CODE;
1807 if (sp->Session_ID == 0) {
1808 neg->pkt->pkt_header.ph.sid =
1809 htons(pppoe_getnewsession(sp));
1810 }
1811 send_sessionid(sp);
1812 neg->timeout = 0;
1813 /*
1814 * start working out the tags to respond with.
1815 */
1816 init_tags(sp);
1817 insert_tag(sp, &neg->ac_name.hdr); /* AC_NAME */
1818 if ((tag = get_tag(ph, PTT_SRV_NAME)))
1819 insert_tag(sp, tag);/* return service */
1820 if ((tag = get_tag(ph, PTT_HOST_UNIQ)))
1821 insert_tag(sp, tag); /* return it */
1822 insert_tag(sp, utag); /* ac_cookie */
1823 scan_tags(sp, ph);
1824 make_packet(sp);
1825 sp->state = PPPOE_NEWCONNECTED;
1826
1827 /* Send the PADS without a timeout - we're now connected. */
1828 m0 = m_copypacket(sp->neg->m, M_NOWAIT);
1829 NG_FWD_NEW_DATA(error, item, privp->ethernet_hook, m0);
1830
1831 /*
1832 * Having sent the last Negotiation header,
1833 * Set up the stored packet header to be correct for
1834 * the actual session. But keep the negotialtion stuff
1835 * around in case we need to resend this last packet.
1836 * We'll discard it when we move from NEWCONNECTED
1837 * to CONNECTED
1838 */
1839 sp->pkt_hdr = neg->pkt->pkt_header;
1840 /* Configure ethertype depending on what
1841 * ethertype was used at discovery phase */
1842 if (sp->pkt_hdr.eh.ether_type ==
1843 ETHERTYPE_PPPOE_3COM_DISC)
1844 sp->pkt_hdr.eh.ether_type
1845 = ETHERTYPE_PPPOE_3COM_SESS;
1846 else
1847 sp->pkt_hdr.eh.ether_type
1848 = ETHERTYPE_PPPOE_SESS;
1849 sp->pkt_hdr.ph.code = 0;
1850 pppoe_send_event(sp, NGM_PPPOE_SUCCESS);
1851 break;
1852 case PADS_CODE:
1853 /*
1854 * We are a client:
1855 * Use the host_uniq tag to find the hook this is in
1856 * response to. Take the session ID and store it away.
1857 * Also make sure the pre-made header is correct and
1858 * set us into Session mode.
1859 */
1860 utag = get_tag(ph, PTT_HOST_UNIQ);
1861 if (utag == NULL) {
1862 LEAVE (ENETUNREACH);
1863 }
1864 sendhook = pppoe_finduniq(node, utag);
1865 if (sendhook == NULL)
1866 LEAVE(ENETUNREACH);
1867
1868 /*
1869 * Check the session is in the right state.
1870 * It needs to be in PPPOE_SREQ.
1871 */
1872 sp = NG_HOOK_PRIVATE(sendhook);
1873 if (sp->state != PPPOE_SREQ)
1874 LEAVE(ENETUNREACH);
1875 neg = sp->neg;
1876 ng_uncallout(&neg->handle, node);
1877 neg->pkt->pkt_header.ph.sid = wh->ph.sid;
1878 sp->Session_ID = ntohs(wh->ph.sid);
1879 pppoe_addsession(sp);
1880 send_sessionid(sp);
1881 neg->timeout = 0;
1882 sp->state = PPPOE_CONNECTED;
1883 /*
1884 * Now we have gone to Connected mode,
1885 * Free all resources needed for negotiation.
1886 * Keep a copy of the header we will be using.
1887 */
1888 sp->pkt_hdr = neg->pkt->pkt_header;
1889 if (privp->flags & COMPAT_3COM)
1890 sp->pkt_hdr.eh.ether_type
1891 = ETHERTYPE_PPPOE_3COM_SESS;
1892 else
1893 sp->pkt_hdr.eh.ether_type
1894 = ETHERTYPE_PPPOE_SESS;
1895 sp->pkt_hdr.ph.code = 0;
1896 m_freem(neg->m);
1897 free(sp->neg, M_NETGRAPH_PPPOE);
1898 sp->neg = NULL;
1899 if ((tag = get_tag(ph, PTT_MAX_PAYL)) &&
1900 (privp->max_payload.data != 0))
1901 send_maxp(sp, tag);
1902 pppoe_send_event(sp, NGM_PPPOE_SUCCESS);
1903 break;
1904 case PADT_CODE:
1905 /*
1906 * Find matching peer/session combination.
1907 */
1908 sp = pppoe_findsession(privp, wh);
1909 if (sp == NULL)
1910 LEAVE(ENETUNREACH);
1911 /* Disconnect that hook. */
1912 ng_rmhook_self(sp->hook);
1913 break;
1914 case PADM_CODE:
1915 /*
1916 * We are a client:
1917 * find matching peer/session combination.
1918 */
1919 sp = pppoe_findsession(privp, wh);
1920 if (sp == NULL)
1921 LEAVE (ENETUNREACH);
1922 if ((tag = get_tag(ph, PTT_HURL)))
1923 send_hurl(sp, tag);
1924 if ((tag = get_tag(ph, PTT_MOTM)))
1925 send_motm(sp, tag);
1926 break;
1927 default:
1928 LEAVE(EPFNOSUPPORT);
1929 }
1930 break;
1931 case ETHERTYPE_PPPOE_3COM_SESS:
1932 case ETHERTYPE_PPPOE_SESS:
1933 /*
1934 * Find matching peer/session combination.
1935 */
1936 sp = pppoe_findsession(privp, wh);
1937 if (sp == NULL)
1938 LEAVE (ENETUNREACH);
1939 m_adj(m, sizeof(*wh));
1940
1941 /* If packet too short, dump it. */
1942 if (m->m_pkthdr.len < length)
1943 LEAVE(EMSGSIZE);
1944 /* Also need to trim excess at the end */
1945 if (m->m_pkthdr.len > length) {
1946 m_adj(m, -((int)(m->m_pkthdr.len - length)));
1947 }
1948 if ( sp->state != PPPOE_CONNECTED) {
1949 if (sp->state == PPPOE_NEWCONNECTED) {
1950 sp->state = PPPOE_CONNECTED;
1951 /*
1952 * Now we have gone to Connected mode,
1953 * Free all resources needed for negotiation.
1954 * Be paranoid about whether there may be
1955 * a timeout.
1956 */
1957 m_freem(sp->neg->m);
1958 ng_uncallout(&sp->neg->handle, node);
1959 free(sp->neg, M_NETGRAPH_PPPOE);
1960 sp->neg = NULL;
1961 } else {
1962 LEAVE (ENETUNREACH);
1963 }
1964 }
1965 NG_FWD_NEW_DATA(error, item, sp->hook, m);
1966 break;
1967 default:
1968 LEAVE(EPFNOSUPPORT);
1969 }
1970 quit:
1971 if (item)
1972 NG_FREE_ITEM(item);
1973 NG_FREE_M(m);
1974 return (error);
1975 }
1976
1977 /*
1978 * Receive data from debug hook and bypass it to ether.
1979 */
1980 static int
ng_pppoe_rcvdata_debug(hook_p hook,item_p item)1981 ng_pppoe_rcvdata_debug(hook_p hook, item_p item)
1982 {
1983 node_p node = NG_HOOK_NODE(hook);
1984 const priv_p privp = NG_NODE_PRIVATE(node);
1985 int error;
1986
1987 CTR6(KTR_NET, "%20s: node [%x] (%p) received %p on \"%s\" (%p)",
1988 __func__, node->nd_ID, node, item, hook->hk_name, hook);
1989
1990 NG_FWD_ITEM_HOOK(error, item, privp->ethernet_hook);
1991 privp->packets_out++;
1992 return (error);
1993 }
1994
1995 /*
1996 * Do local shutdown processing..
1997 * If we are a persistent device, we might refuse to go away, and
1998 * we'd only remove our links and reset ourself.
1999 */
2000 static int
ng_pppoe_shutdown(node_p node)2001 ng_pppoe_shutdown(node_p node)
2002 {
2003 const priv_p privp = NG_NODE_PRIVATE(node);
2004 int i;
2005
2006 for (i = 0; i < SESSHASHSIZE; i++)
2007 mtx_destroy(&privp->sesshash[i].mtx);
2008 NG_NODE_SET_PRIVATE(node, NULL);
2009 NG_NODE_UNREF(privp->node);
2010 free(privp, M_NETGRAPH_PPPOE);
2011 return (0);
2012 }
2013
2014 /*
2015 * Hook disconnection
2016 *
2017 * Clean up all dangling links and information about the session/hook.
2018 * For this type, removal of the last link destroys the node.
2019 */
2020 static int
ng_pppoe_disconnect(hook_p hook)2021 ng_pppoe_disconnect(hook_p hook)
2022 {
2023 node_p node = NG_HOOK_NODE(hook);
2024 priv_p privp = NG_NODE_PRIVATE(node);
2025 sessp sp;
2026
2027 if (hook == privp->debug_hook) {
2028 privp->debug_hook = NULL;
2029 } else if (hook == privp->ethernet_hook) {
2030 privp->ethernet_hook = NULL;
2031 if (NG_NODE_IS_VALID(node))
2032 ng_rmnode_self(node);
2033 } else {
2034 sp = NG_HOOK_PRIVATE(hook);
2035 if (sp->state != PPPOE_SNONE ) {
2036 pppoe_send_event(sp, NGM_PPPOE_CLOSE);
2037 }
2038 /*
2039 * According to the spec, if we are connected,
2040 * we should send a DISC packet if we are shutting down
2041 * a session.
2042 */
2043 if ((privp->ethernet_hook)
2044 && ((sp->state == PPPOE_CONNECTED)
2045 || (sp->state == PPPOE_NEWCONNECTED))) {
2046 struct mbuf *m;
2047
2048 /* Generate a packet of that type. */
2049 m = m_gethdr(M_NOWAIT, MT_DATA);
2050 if (m == NULL)
2051 log(LOG_NOTICE, "ng_pppoe[%x]: session out of "
2052 "mbufs\n", node->nd_ID);
2053 else {
2054 struct epoch_tracker et;
2055 struct pppoe_full_hdr *wh;
2056 struct pppoe_tag *tag;
2057 int msglen = strlen(SIGNOFF);
2058 int error = 0;
2059
2060 wh = mtod(m, struct pppoe_full_hdr *);
2061 bcopy(&sp->pkt_hdr, wh, sizeof(*wh));
2062
2063 /* Revert the stored header to DISC/PADT mode. */
2064 wh->ph.code = PADT_CODE;
2065 /*
2066 * Configure ethertype depending on what
2067 * was used during sessions stage.
2068 */
2069 if (wh->eh.ether_type ==
2070 ETHERTYPE_PPPOE_3COM_SESS)
2071 wh->eh.ether_type = ETHERTYPE_PPPOE_3COM_DISC;
2072 else
2073 wh->eh.ether_type = ETHERTYPE_PPPOE_DISC;
2074 /*
2075 * Add a General error message and adjust
2076 * sizes.
2077 */
2078 tag = (void *)(&wh->ph + 1);
2079 tag->tag_type = PTT_GEN_ERR;
2080 tag->tag_len = htons((u_int16_t)msglen);
2081 strncpy((char *)(tag + 1), SIGNOFF, msglen);
2082 m->m_pkthdr.len = m->m_len = sizeof(*wh) + sizeof(*tag) +
2083 msglen;
2084 wh->ph.length = htons(sizeof(*tag) + msglen);
2085
2086 NET_EPOCH_ENTER(et);
2087 NG_SEND_DATA_ONLY(error,
2088 privp->ethernet_hook, m);
2089 NET_EPOCH_EXIT(et);
2090 }
2091 }
2092 if (sp->state == PPPOE_LISTENING)
2093 LIST_REMOVE(sp, sessions);
2094 else if (sp->Session_ID)
2095 pppoe_delsession(sp);
2096 /*
2097 * As long as we have somewhere to store the timeout handle,
2098 * we may have a timeout pending.. get rid of it.
2099 */
2100 if (sp->neg) {
2101 ng_uncallout(&sp->neg->handle, node);
2102 if (sp->neg->m)
2103 m_freem(sp->neg->m);
2104 free(sp->neg, M_NETGRAPH_PPPOE);
2105 }
2106 free(sp, M_NETGRAPH_PPPOE);
2107 NG_HOOK_SET_PRIVATE(hook, NULL);
2108 }
2109 if ((NG_NODE_NUMHOOKS(node) == 0) &&
2110 (NG_NODE_IS_VALID(node)))
2111 ng_rmnode_self(node);
2112 return (0);
2113 }
2114
2115 /*
2116 * Timeouts come here.
2117 */
2118 static void
pppoe_ticker(node_p node,hook_p hook,void * arg1,int arg2)2119 pppoe_ticker(node_p node, hook_p hook, void *arg1, int arg2)
2120 {
2121 priv_p privp = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
2122 sessp sp = NG_HOOK_PRIVATE(hook);
2123 negp neg = sp->neg;
2124 struct mbuf *m0 = NULL;
2125 int error = 0;
2126
2127 CTR6(KTR_NET, "%20s: node [%x] (%p) hook \"%s\" (%p) session %d",
2128 __func__, node->nd_ID, node, hook->hk_name, hook, sp->Session_ID);
2129 switch(sp->state) {
2130 /*
2131 * Resend the last packet, using an exponential backoff.
2132 * After a period of time, stop growing the backoff,
2133 * And either leave it, or revert to the start.
2134 */
2135 case PPPOE_SINIT:
2136 case PPPOE_SREQ:
2137 /* Timeouts on these produce resends. */
2138 m0 = m_copypacket(sp->neg->m, M_NOWAIT);
2139 NG_SEND_DATA_ONLY( error, privp->ethernet_hook, m0);
2140 ng_callout(&neg->handle, node, hook, neg->timeout * hz,
2141 pppoe_ticker, NULL, 0);
2142 if ((neg->timeout <<= 1) > PPPOE_TIMEOUT_LIMIT) {
2143 if (sp->state == PPPOE_SREQ) {
2144 /* Revert to SINIT mode. */
2145 pppoe_start(sp);
2146 } else {
2147 neg->timeout = PPPOE_TIMEOUT_LIMIT;
2148 }
2149 }
2150 break;
2151 case PPPOE_PRIMED:
2152 case PPPOE_SOFFER:
2153 /* A timeout on these says "give up" */
2154 ng_rmhook_self(hook);
2155 break;
2156 default:
2157 /* Timeouts have no meaning in other states. */
2158 log(LOG_NOTICE, "ng_pppoe[%x]: unexpected timeout\n",
2159 node->nd_ID);
2160 }
2161 }
2162
2163 /*
2164 * Parse an incoming packet to see if any tags should be copied to the
2165 * output packet. Don't do any tags that have been handled in the main
2166 * state machine.
2167 */
2168 static const struct pppoe_tag*
scan_tags(sessp sp,const struct pppoe_hdr * ph)2169 scan_tags(sessp sp, const struct pppoe_hdr* ph)
2170 {
2171 const char *const end = (const char *)next_tag(ph);
2172 const char *ptn;
2173 const struct pppoe_tag *pt = (const void *)(ph + 1);
2174
2175 /*
2176 * Keep processing tags while a tag header will still fit.
2177 */
2178 CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID);
2179
2180 while((const char*)(pt + 1) <= end) {
2181 /*
2182 * If the tag data would go past the end of the packet, abort.
2183 */
2184 ptn = (((const char *)(pt + 1)) + ntohs(pt->tag_len));
2185 if(ptn > end)
2186 return NULL;
2187
2188 switch (pt->tag_type) {
2189 case PTT_RELAY_SID:
2190 insert_tag(sp, pt);
2191 break;
2192 case PTT_EOL:
2193 return NULL;
2194 case PTT_SRV_NAME:
2195 case PTT_AC_NAME:
2196 case PTT_HOST_UNIQ:
2197 case PTT_AC_COOKIE:
2198 case PTT_VENDOR:
2199 case PTT_SRV_ERR:
2200 case PTT_SYS_ERR:
2201 case PTT_GEN_ERR:
2202 case PTT_MAX_PAYL:
2203 case PTT_HURL:
2204 case PTT_MOTM:
2205 break;
2206 }
2207 pt = (const struct pppoe_tag*)ptn;
2208 }
2209 return NULL;
2210 }
2211
2212 static int
pppoe_send_event(sessp sp,enum cmd cmdid)2213 pppoe_send_event(sessp sp, enum cmd cmdid)
2214 {
2215 int error;
2216 struct ng_mesg *msg;
2217 struct ngpppoe_sts *sts;
2218
2219 CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID);
2220
2221 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, cmdid,
2222 sizeof(struct ngpppoe_sts), M_NOWAIT);
2223 if (msg == NULL)
2224 return (ENOMEM);
2225 sts = (struct ngpppoe_sts *)msg->data;
2226 strncpy(sts->hook, NG_HOOK_NAME(sp->hook), NG_HOOKSIZ);
2227 NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0);
2228 return (error);
2229 }
2230