1
2 /*
3 * ng_pppoe.c
4 *
5 * Copyright (c) 1996-1999 Whistle Communications, Inc.
6 * All rights reserved.
7 *
8 * Subject to the following obligations and disclaimer of warranty, use and
9 * redistribution of this software, in source or object code forms, with or
10 * without modifications are expressly permitted by Whistle Communications;
11 * provided, however, that:
12 * 1. Any and all reproductions of the source or object code must include the
13 * copyright notice above and the following disclaimer of warranties; and
14 * 2. No rights are granted, in any manner or form, to use Whistle
15 * Communications, Inc. trademarks, including the mark "WHISTLE
16 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as
17 * such appears in the above copyright notice or in the software.
18 *
19 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
20 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
21 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
22 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
23 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
24 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
25 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
26 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
27 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
28 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
29 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
30 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
31 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
32 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
33 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
34 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
35 * OF SUCH DAMAGE.
36 *
37 * Author: Julian Elischer <julian@freebsd.org>
38 *
39 * $FreeBSD: src/sys/netgraph/ng_pppoe.c,v 1.23.2.17 2002/07/02 22:17:18 archie Exp $
40 * $Whistle: ng_pppoe.c,v 1.10 1999/11/01 09:24:52 julian Exp $
41 */
42 #if 0
43 #define AAA kprintf("pppoe: %s\n", __func__ );
44 #define BBB kprintf("-%d-", __LINE__ );
45 #else
46 #define AAA
47 #define BBB
48 #endif
49
50 #include <sys/param.h>
51 #include <sys/systm.h>
52 #include <sys/kernel.h>
53 #include <sys/mbuf.h>
54 #include <sys/malloc.h>
55 #include <sys/errno.h>
56 #include <sys/sysctl.h>
57 #include <sys/syslog.h>
58 #include <sys/thread2.h>
59
60 #include <net/if.h>
61 #include <net/if_var.h>
62 #include <net/ethernet.h>
63
64 #include <netgraph/ng_message.h>
65 #include <netgraph/netgraph.h>
66 #include "ng_pppoe.h"
67
68 #define SIGNOFF "session closed"
69
70 /*
71 * This section contains the netgraph method declarations for the
72 * pppoe node. These methods define the netgraph pppoe 'type'.
73 */
74
75 static ng_constructor_t ng_pppoe_constructor;
76 static ng_rcvmsg_t ng_pppoe_rcvmsg;
77 static ng_shutdown_t ng_pppoe_rmnode;
78 static ng_newhook_t ng_pppoe_newhook;
79 static ng_connect_t ng_pppoe_connect;
80 static ng_rcvdata_t ng_pppoe_rcvdata;
81 static ng_disconnect_t ng_pppoe_disconnect;
82
83 /* Netgraph node type descriptor */
84 static struct ng_type typestruct = {
85 NG_VERSION,
86 NG_PPPOE_NODE_TYPE,
87 NULL,
88 ng_pppoe_constructor,
89 ng_pppoe_rcvmsg,
90 ng_pppoe_rmnode,
91 ng_pppoe_newhook,
92 NULL,
93 ng_pppoe_connect,
94 ng_pppoe_rcvdata,
95 ng_pppoe_rcvdata,
96 ng_pppoe_disconnect,
97 NULL
98 };
99 NETGRAPH_INIT(pppoe, &typestruct);
100
101 /*
102 * States for the session state machine.
103 * These have no meaning if there is no hook attached yet.
104 */
105 enum state {
106 PPPOE_SNONE=0, /* [both] Initial state */
107 PPPOE_LISTENING, /* [Daemon] Listening for discover initiation pkt */
108 PPPOE_SINIT, /* [Client] Sent discovery initiation */
109 PPPOE_PRIMED, /* [Server] Awaiting PADI from daemon */
110 PPPOE_SOFFER, /* [Server] Sent offer message (got PADI)*/
111 PPPOE_SREQ, /* [Client] Sent a Request */
112 PPPOE_NEWCONNECTED, /* [Server] Connection established, No data received */
113 PPPOE_CONNECTED, /* [Both] Connection established, Data received */
114 PPPOE_DEAD /* [Both] */
115 };
116
117 #define NUMTAGS 20 /* number of tags we are set up to work with */
118
119 /*
120 * Information we store for each hook on each node for negotiating the
121 * session. The mbuf and cluster are freed once negotiation has completed.
122 * The whole negotiation block is then discarded.
123 */
124
125 struct sess_neg {
126 struct mbuf *m; /* holds cluster with last sent packet */
127 union packet *pkt; /* points within the above cluster */
128 struct callout timeout_ch;
129 u_int timeout; /* 0,1,2,4,8,16 etc. seconds */
130 u_int numtags;
131 const struct pppoe_tag *tags[NUMTAGS];
132 u_int service_len;
133 u_int ac_name_len;
134
135 struct datatag service;
136 struct datatag ac_name;
137 };
138 typedef struct sess_neg *negp;
139
140 /*
141 * Session information that is needed after connection.
142 */
143 struct sess_con {
144 hook_p hook;
145 u_int16_t Session_ID;
146 enum state state;
147 char creator[NG_NODESIZ]; /* who to notify */
148 struct pppoe_full_hdr pkt_hdr; /* used when connected */
149 negp neg; /* used when negotiating */
150 /*struct sess_con *hash_next;*/ /* not yet used */
151 };
152 typedef struct sess_con *sessp;
153
154 /*
155 * Information we store for each node
156 */
157 struct PPPOE {
158 node_p node; /* back pointer to node */
159 hook_p ethernet_hook;
160 hook_p debug_hook;
161 u_int packets_in; /* packets in from ethernet */
162 u_int packets_out; /* packets out towards ethernet */
163 u_int32_t flags;
164 /*struct sess_con *buckets[HASH_SIZE];*/ /* not yet used */
165 };
166 typedef struct PPPOE *priv_p;
167
168 struct ether_header eh_prototype =
169 {{0xff,0xff,0xff,0xff,0xff,0xff},
170 {0x00,0x00,0x00,0x00,0x00,0x00},
171 ETHERTYPE_PPPOE_DISC};
172
173 #define PPPOE_KEEPSTANDARD -1 /* never switch to nonstandard mode */
174 #define PPPOE_STANDARD 0 /* try standard mode (dangerous!) */
175 #define PPPOE_NONSTANDARD 1 /* just be in nonstandard mode */
176 static int pppoe_mode = PPPOE_KEEPSTANDARD;
177
178 static int
ngpppoe_set_ethertype(SYSCTL_HANDLER_ARGS)179 ngpppoe_set_ethertype(SYSCTL_HANDLER_ARGS)
180 {
181 int error;
182 int val;
183
184 val = pppoe_mode;
185 error = sysctl_handle_int(oidp, &val, 0, req);
186 if (error != 0 || req->newptr == NULL)
187 return (error);
188 switch (val) {
189 case PPPOE_NONSTANDARD:
190 pppoe_mode = PPPOE_NONSTANDARD;
191 eh_prototype.ether_type = ETHERTYPE_PPPOE_STUPID_DISC;
192 break;
193 case PPPOE_STANDARD:
194 pppoe_mode = PPPOE_STANDARD;
195 eh_prototype.ether_type = ETHERTYPE_PPPOE_DISC;
196 break;
197 case PPPOE_KEEPSTANDARD:
198 pppoe_mode = PPPOE_KEEPSTANDARD;
199 eh_prototype.ether_type = ETHERTYPE_PPPOE_DISC;
200 break;
201 default:
202 return (EINVAL);
203 }
204 return (0);
205 }
206
207 SYSCTL_PROC(_net_graph, OID_AUTO, nonstandard_pppoe, CTLTYPE_INT | CTLFLAG_RW,
208 0, sizeof(int), ngpppoe_set_ethertype, "I", "nonstandard ethertype");
209
210 union uniq {
211 char bytes[sizeof(void *)];
212 void * pointer;
213 };
214
215 #define LEAVE(x) do { error = x; goto quit; } while(0)
216 static void pppoe_start(sessp sp);
217 static void sendpacket(sessp sp);
218 static void pppoe_ticker(void *arg);
219 static const struct pppoe_tag *scan_tags(sessp sp,
220 const struct pppoe_hdr* ph);
221 static int pppoe_send_event(sessp sp, enum cmd cmdid);
222
223 /*************************************************************************
224 * Some basic utilities from the Linux version with author's permission.*
225 * Author: Michal Ostrowski <mostrows@styx.uwaterloo.ca> *
226 ************************************************************************/
227
228 /*
229 * Generate a new session id
230 * XXX find out the FreeBSD locking scheme.
231 */
232 static u_int16_t
get_new_sid(node_p node)233 get_new_sid(node_p node)
234 {
235 static int pppoe_sid = 10;
236 sessp sp;
237 hook_p hook;
238 u_int16_t val;
239 priv_p privp = node->private;
240
241 AAA
242 restart:
243 val = pppoe_sid++;
244 /*
245 * Spec says 0xFFFF is reserved.
246 * Also don't use 0x0000
247 */
248 if (val == 0xffff) {
249 pppoe_sid = 20;
250 goto restart;
251 }
252
253 /* Check it isn't already in use */
254 LIST_FOREACH(hook, &node->hooks, hooks) {
255 /* don't check special hooks */
256 if ((hook->private == &privp->debug_hook)
257 || (hook->private == &privp->ethernet_hook))
258 continue;
259 sp = hook->private;
260 if (sp->Session_ID == val)
261 goto restart;
262 }
263
264 return val;
265 }
266
267
268 /*
269 * Return the location where the next tag can be put
270 */
271 static __inline const struct pppoe_tag*
next_tag(const struct pppoe_hdr * ph)272 next_tag(const struct pppoe_hdr* ph)
273 {
274 return (const struct pppoe_tag*)(((const char*)&ph->tag[0])
275 + ntohs(ph->length));
276 }
277
278 /*
279 * Look for a tag of a specific type
280 * Don't trust any length the other end says.
281 * but assume we already sanity checked ph->length.
282 */
283 static const struct pppoe_tag*
get_tag(const struct pppoe_hdr * ph,u_int16_t idx)284 get_tag(const struct pppoe_hdr* ph, u_int16_t idx)
285 {
286 const char *const end = (const char *)next_tag(ph);
287 const char *ptn;
288 const struct pppoe_tag *pt = &ph->tag[0];
289 /*
290 * Keep processing tags while a tag header will still fit.
291 */
292 AAA
293 while((const char*)(pt + 1) <= end) {
294 /*
295 * If the tag data would go past the end of the packet, abort.
296 */
297 ptn = (((const char *)(pt + 1)) + ntohs(pt->tag_len));
298 if(ptn > end)
299 return NULL;
300
301 if(pt->tag_type == idx)
302 return pt;
303
304 pt = (const struct pppoe_tag*)ptn;
305 }
306 return NULL;
307 }
308
309 /**************************************************************************
310 * inlines to initialise or add tags to a session's tag list,
311 **************************************************************************/
312 /*
313 * Initialise the session's tag list
314 */
315 static void
init_tags(sessp sp)316 init_tags(sessp sp)
317 {
318 AAA
319 if(sp->neg == NULL) {
320 kprintf("pppoe: asked to init NULL neg pointer\n");
321 return;
322 }
323 sp->neg->numtags = 0;
324 }
325
326 static void
insert_tag(sessp sp,const struct pppoe_tag * tp)327 insert_tag(sessp sp, const struct pppoe_tag *tp)
328 {
329 int i;
330 negp neg;
331
332 AAA
333 if((neg = sp->neg) == NULL) {
334 kprintf("pppoe: asked to use NULL neg pointer\n");
335 return;
336 }
337 if ((i = neg->numtags++) < NUMTAGS) {
338 neg->tags[i] = tp;
339 } else {
340 kprintf("pppoe: asked to add too many tags to packet\n");
341 neg->numtags--;
342 }
343 }
344
345 /*
346 * Make up a packet, using the tags filled out for the session.
347 *
348 * Assume that the actual pppoe header and ethernet header
349 * are filled out externally to this routine.
350 * Also assume that neg->wh points to the correct
351 * location at the front of the buffer space.
352 */
353 static void
make_packet(sessp sp)354 make_packet(sessp sp) {
355 struct pppoe_full_hdr *wh = &sp->neg->pkt->pkt_header;
356 const struct pppoe_tag **tag;
357 char *dp;
358 int count;
359 int tlen;
360 u_int16_t length = 0;
361
362 AAA
363 if ((sp->neg == NULL) || (sp->neg->m == NULL)) {
364 kprintf("pppoe: make_packet called from wrong state\n");
365 }
366 dp = (char *)wh->ph.tag;
367 for (count = 0, tag = sp->neg->tags;
368 ((count < sp->neg->numtags) && (count < NUMTAGS));
369 tag++, count++) {
370 tlen = ntohs((*tag)->tag_len) + sizeof(**tag);
371 if ((length + tlen) > (ETHER_MAX_LEN - 4 - sizeof(*wh))) {
372 kprintf("pppoe: tags too long\n");
373 sp->neg->numtags = count;
374 break; /* XXX chop off what's too long */
375 }
376 bcopy(*tag, dp, tlen);
377 length += tlen;
378 dp += tlen;
379 }
380 wh->ph.length = htons(length);
381 sp->neg->m->m_len = length + sizeof(*wh);
382 sp->neg->m->m_pkthdr.len = length + sizeof(*wh);
383 }
384
385 /**************************************************************************
386 * Routine to match a service offered *
387 **************************************************************************/
388 /*
389 * Find a hook that has a service string that matches that
390 * we are seeking. for now use a simple string.
391 * In the future we may need something like regexp().
392 * for testing allow a null string to match 1st found and a null service
393 * to match all requests. Also make '*' do the same.
394 */
395
396 #define NG_MATCH_EXACT 1
397 #define NG_MATCH_ANY 2
398
399 static hook_p
pppoe_match_svc(node_p node,const char * svc_name,int svc_len,int match)400 pppoe_match_svc(node_p node, const char *svc_name, int svc_len, int match)
401 {
402 sessp sp = NULL;
403 negp neg = NULL;
404 priv_p privp = node->private;
405 hook_p allhook = NULL;
406 hook_p hook;
407
408 AAA
409 LIST_FOREACH(hook, &node->hooks, hooks) {
410
411 /* skip any hook that is debug or ethernet */
412 if ((hook->private == &privp->debug_hook)
413 || (hook->private == &privp->ethernet_hook))
414 continue;
415 sp = hook->private;
416
417 /* Skip any sessions which are not in LISTEN mode. */
418 if ( sp->state != PPPOE_LISTENING)
419 continue;
420
421 neg = sp->neg;
422
423 /* Special case for a blank or "*" service name (wildcard) */
424 if (match == NG_MATCH_ANY && neg->service_len == 1 &&
425 neg->service.data[0] == '*') {
426 allhook = hook;
427 continue;
428 }
429
430 /* If the lengths don't match, that aint it. */
431 if (neg->service_len != svc_len)
432 continue;
433
434 /* An exact match? */
435 if (svc_len == 0)
436 break;
437
438 if (strncmp(svc_name, neg->service.data, svc_len) == 0)
439 break;
440 }
441 return (hook ? hook : allhook);
442 }
443 /**************************************************************************
444 * Routine to find a particular session that matches an incoming packet *
445 **************************************************************************/
446 static hook_p
pppoe_findsession(node_p node,const struct pppoe_full_hdr * wh)447 pppoe_findsession(node_p node, const struct pppoe_full_hdr *wh)
448 {
449 sessp sp = NULL;
450 hook_p hook = NULL;
451 priv_p privp = node->private;
452 u_int16_t session = ntohs(wh->ph.sid);
453
454 /*
455 * find matching peer/session combination.
456 */
457 AAA
458 LIST_FOREACH(hook, &node->hooks, hooks) {
459 /* don't check special hooks */
460 if ((hook->private == &privp->debug_hook)
461 || (hook->private == &privp->ethernet_hook)) {
462 continue;
463 }
464 sp = hook->private;
465 if ( ( (sp->state == PPPOE_CONNECTED)
466 || (sp->state == PPPOE_NEWCONNECTED) )
467 && (sp->Session_ID == session)
468 && (bcmp(sp->pkt_hdr.eh.ether_dhost,
469 wh->eh.ether_shost,
470 ETHER_ADDR_LEN)) == 0) {
471 break;
472 }
473 }
474 return (hook);
475 }
476
477 static hook_p
pppoe_finduniq(node_p node,const struct pppoe_tag * tag)478 pppoe_finduniq(node_p node, const struct pppoe_tag *tag)
479 {
480 hook_p hook = NULL;
481 priv_p privp = node->private;
482 union uniq uniq;
483
484 AAA
485 bcopy(tag->tag_data, uniq.bytes, sizeof(void *));
486 /* cycle through all known hooks */
487 LIST_FOREACH(hook, &node->hooks, hooks) {
488 /* don't check special hooks */
489 if ((hook->private == &privp->debug_hook)
490 || (hook->private == &privp->ethernet_hook))
491 continue;
492 if (uniq.pointer == hook->private)
493 break;
494 }
495 return (hook);
496 }
497
498 /**************************************************************************
499 * start of Netgraph entrypoints *
500 **************************************************************************/
501
502 /*
503 * Allocate the private data structure and the generic node
504 * and link them together.
505 *
506 * ng_make_node_common() returns with a generic node struct
507 * with a single reference for us.. we transfer it to the
508 * private structure.. when we free the private struct we must
509 * unref the node so it gets freed too.
510 */
511 static int
ng_pppoe_constructor(node_p * nodep)512 ng_pppoe_constructor(node_p *nodep)
513 {
514 priv_p privdata;
515 int error;
516
517 AAA
518 /* Initialize private descriptor */
519 privdata = kmalloc(sizeof(*privdata), M_NETGRAPH, M_NOWAIT | M_ZERO);
520 if (privdata == NULL)
521 return (ENOMEM);
522
523 /* Call the 'generic' (ie, superclass) node constructor */
524 if ((error = ng_make_node_common(&typestruct, nodep))) {
525 kfree(privdata, M_NETGRAPH);
526 return (error);
527 }
528
529 /* Link structs together; this counts as our one reference to *nodep */
530 (*nodep)->private = privdata;
531 privdata->node = *nodep;
532 return (0);
533 }
534
535 /*
536 * Give our ok for a hook to be added...
537 * point the hook's private info to the hook structure.
538 *
539 * The following hook names are special:
540 * Ethernet: the hook that should be connected to a NIC.
541 * debug: copies of data sent out here (when I write the code).
542 * All other hook names need only be unique. (the framework checks this).
543 */
544 static int
ng_pppoe_newhook(node_p node,hook_p hook,const char * name)545 ng_pppoe_newhook(node_p node, hook_p hook, const char *name)
546 {
547 const priv_p privp = node->private;
548 sessp sp;
549
550 AAA
551 if (strcmp(name, NG_PPPOE_HOOK_ETHERNET) == 0) {
552 privp->ethernet_hook = hook;
553 hook->private = &privp->ethernet_hook;
554 } else if (strcmp(name, NG_PPPOE_HOOK_DEBUG) == 0) {
555 privp->debug_hook = hook;
556 hook->private = &privp->debug_hook;
557 } else {
558 /*
559 * Any other unique name is OK.
560 * The infrastructure has already checked that it's unique,
561 * so just allocate it and hook it in.
562 */
563 sp = kmalloc(sizeof(*sp), M_NETGRAPH, M_NOWAIT | M_ZERO);
564 if (sp == NULL)
565 return (ENOMEM);
566
567 hook->private = sp;
568 sp->hook = hook;
569 }
570 return(0);
571 }
572
573 /*
574 * Get a netgraph control message.
575 * Check it is one we understand. If needed, send a response.
576 * We sometimes save the address for an async action later.
577 * Always free the message.
578 */
579 static int
ng_pppoe_rcvmsg(node_p node,struct ng_mesg * msg,const char * retaddr,struct ng_mesg ** rptr)580 ng_pppoe_rcvmsg(node_p node,
581 struct ng_mesg *msg, const char *retaddr, struct ng_mesg **rptr)
582 {
583 priv_p privp = node->private;
584 struct ngpppoe_init_data *ourmsg = NULL;
585 struct ng_mesg *resp = NULL;
586 int error = 0;
587 hook_p hook = NULL;
588 sessp sp = NULL;
589 negp neg = NULL;
590
591 AAA
592 /* Deal with message according to cookie and command */
593 switch (msg->header.typecookie) {
594 case NGM_PPPOE_COOKIE:
595 switch (msg->header.cmd) {
596 case NGM_PPPOE_CONNECT:
597 case NGM_PPPOE_LISTEN:
598 case NGM_PPPOE_OFFER:
599 case NGM_PPPOE_SERVICE:
600 ourmsg = (struct ngpppoe_init_data *)msg->data;
601 if (( sizeof(*ourmsg) > msg->header.arglen)
602 || ((sizeof(*ourmsg) + ourmsg->data_len)
603 > msg->header.arglen)) {
604 kprintf("pppoe_rcvmsg: bad arg size");
605 LEAVE(EMSGSIZE);
606 }
607 if (ourmsg->data_len > PPPOE_SERVICE_NAME_SIZE) {
608 kprintf("pppoe: init data too long (%d)\n",
609 ourmsg->data_len);
610 LEAVE(EMSGSIZE);
611 }
612 /* make sure strcmp will terminate safely */
613 ourmsg->hook[sizeof(ourmsg->hook) - 1] = '\0';
614
615 /* cycle through all known hooks */
616 LIST_FOREACH(hook, &node->hooks, hooks) {
617 if (hook->name
618 && strcmp(hook->name, ourmsg->hook) == 0)
619 break;
620 }
621 if (hook == NULL) {
622 LEAVE(ENOENT);
623 }
624 if ((hook->private == &privp->debug_hook)
625 || (hook->private == &privp->ethernet_hook)) {
626 LEAVE(EINVAL);
627 }
628 sp = hook->private;
629
630 if (msg->header.cmd == NGM_PPPOE_LISTEN) {
631 /*
632 * Ensure we aren't already listening for this
633 * service.
634 */
635 if (pppoe_match_svc(node, ourmsg->data,
636 ourmsg->data_len, NG_MATCH_EXACT) != NULL) {
637 LEAVE(EEXIST);
638 }
639 }
640
641 /*
642 * PPPOE_SERVICE advertisments are set up
643 * on sessions that are in PRIMED state.
644 */
645 if (msg->header.cmd == NGM_PPPOE_SERVICE) {
646 break;
647 }
648 if (sp->state != PPPOE_SNONE) {
649 kprintf("pppoe: Session already active\n");
650 LEAVE(EISCONN);
651 }
652
653 /*
654 * set up prototype header
655 */
656 neg = kmalloc(sizeof(*neg), M_NETGRAPH,
657 M_NOWAIT | M_ZERO);
658
659 if (neg == NULL) {
660 kprintf("pppoe: Session out of memory\n");
661 LEAVE(ENOMEM);
662 }
663 MGETHDR(neg->m, M_NOWAIT, MT_DATA);
664 if(neg->m == NULL) {
665 kprintf("pppoe: Session out of mbufs\n");
666 kfree(neg, M_NETGRAPH);
667 LEAVE(ENOBUFS);
668 }
669 neg->m->m_pkthdr.rcvif = NULL;
670 MCLGET(neg->m, M_NOWAIT);
671 if ((neg->m->m_flags & M_EXT) == 0) {
672 kprintf("pppoe: Session out of mcls\n");
673 m_freem(neg->m);
674 kfree(neg, M_NETGRAPH);
675 LEAVE(ENOBUFS);
676 }
677 sp->neg = neg;
678 callout_init(&neg->timeout_ch);
679 neg->m->m_len = sizeof(struct pppoe_full_hdr);
680 neg->pkt = mtod(neg->m, union packet*);
681 neg->pkt->pkt_header.eh = eh_prototype;
682 neg->pkt->pkt_header.ph.ver = 0x1;
683 neg->pkt->pkt_header.ph.type = 0x1;
684 neg->pkt->pkt_header.ph.sid = 0x0000;
685 neg->timeout = 0;
686
687 strlcpy(sp->creator, retaddr, NG_NODESIZ);
688 }
689 switch (msg->header.cmd) {
690 case NGM_PPPOE_GET_STATUS:
691 {
692 struct ngpppoestat *stats;
693
694 NG_MKRESPONSE(resp, msg, sizeof(*stats), M_NOWAIT);
695 if (!resp) {
696 LEAVE(ENOMEM);
697 }
698 stats = (struct ngpppoestat *) resp->data;
699 stats->packets_in = privp->packets_in;
700 stats->packets_out = privp->packets_out;
701 break;
702 }
703 case NGM_PPPOE_CONNECT:
704 /*
705 * Check the hook exists and is Uninitialised.
706 * Send a PADI request, and start the timeout logic.
707 * Store the originator of this message so we can send
708 * a success of fail message to them later.
709 * Move the session to SINIT
710 * Set up the session to the correct state and
711 * start it.
712 */
713 neg->service.hdr.tag_type = PTT_SRV_NAME;
714 neg->service.hdr.tag_len =
715 htons((u_int16_t)ourmsg->data_len);
716 if (ourmsg->data_len) {
717 bcopy(ourmsg->data,
718 neg->service.data, ourmsg->data_len);
719 }
720 neg->service_len = ourmsg->data_len;
721 pppoe_start(sp);
722 break;
723 case NGM_PPPOE_LISTEN:
724 /*
725 * Check the hook exists and is Uninitialised.
726 * Install the service matching string.
727 * Store the originator of this message so we can send
728 * a success of fail message to them later.
729 * Move the hook to 'LISTENING'
730 */
731 neg->service.hdr.tag_type = PTT_SRV_NAME;
732 neg->service.hdr.tag_len =
733 htons((u_int16_t)ourmsg->data_len);
734
735 if (ourmsg->data_len) {
736 bcopy(ourmsg->data,
737 neg->service.data, ourmsg->data_len);
738 }
739 neg->service_len = ourmsg->data_len;
740 neg->pkt->pkt_header.ph.code = PADT_CODE;
741 /*
742 * wait for PADI packet coming from ethernet
743 */
744 sp->state = PPPOE_LISTENING;
745 break;
746 case NGM_PPPOE_OFFER:
747 /*
748 * Check the hook exists and is Uninitialised.
749 * Store the originator of this message so we can send
750 * a success of fail message to them later.
751 * Store the AC-Name given and go to PRIMED.
752 */
753 neg->ac_name.hdr.tag_type = PTT_AC_NAME;
754 neg->ac_name.hdr.tag_len =
755 htons((u_int16_t)ourmsg->data_len);
756 if (ourmsg->data_len) {
757 bcopy(ourmsg->data,
758 neg->ac_name.data, ourmsg->data_len);
759 }
760 neg->ac_name_len = ourmsg->data_len;
761 neg->pkt->pkt_header.ph.code = PADO_CODE;
762 /*
763 * Wait for PADI packet coming from hook
764 */
765 sp->state = PPPOE_PRIMED;
766 break;
767 case NGM_PPPOE_SERVICE:
768 /*
769 * Check the session is primed.
770 * for now just allow ONE service to be advertised.
771 * If you do it twice you just overwrite.
772 */
773 if (sp->state != PPPOE_PRIMED) {
774 kprintf("pppoe: Session not primed\n");
775 LEAVE(EISCONN);
776 }
777 neg = sp->neg;
778 neg->service.hdr.tag_type = PTT_SRV_NAME;
779 neg->service.hdr.tag_len =
780 htons((u_int16_t)ourmsg->data_len);
781
782 if (ourmsg->data_len)
783 bcopy(ourmsg->data, neg->service.data,
784 ourmsg->data_len);
785 neg->service_len = ourmsg->data_len;
786 break;
787 default:
788 LEAVE(EINVAL);
789 }
790 break;
791 default:
792 LEAVE(EINVAL);
793 }
794
795 /* Take care of synchronous response, if any */
796 if (rptr)
797 *rptr = resp;
798 else if (resp)
799 kfree(resp, M_NETGRAPH);
800
801 /* Free the message and return */
802 quit:
803 kfree(msg, M_NETGRAPH);
804 return(error);
805 }
806
807 /*
808 * Start a client into the first state. A separate function because
809 * it can be needed if the negotiation times out.
810 */
811 static void
pppoe_start(sessp sp)812 pppoe_start(sessp sp)
813 {
814 struct {
815 struct pppoe_tag hdr;
816 union uniq data;
817 } __attribute ((packed)) uniqtag;
818
819 /*
820 * kick the state machine into starting up
821 */
822 AAA
823 sp->state = PPPOE_SINIT;
824 /* reset the packet header to broadcast */
825 sp->neg->pkt->pkt_header.eh = eh_prototype;
826 sp->neg->pkt->pkt_header.ph.code = PADI_CODE;
827 uniqtag.hdr.tag_type = PTT_HOST_UNIQ;
828 uniqtag.hdr.tag_len = htons((u_int16_t)sizeof(uniqtag.data));
829 uniqtag.data.pointer = sp;
830 init_tags(sp);
831 insert_tag(sp, &uniqtag.hdr);
832 insert_tag(sp, &sp->neg->service.hdr);
833 make_packet(sp);
834 sendpacket(sp);
835 }
836
837 static int
send_acname(sessp sp,const struct pppoe_tag * tag)838 send_acname(sessp sp, const struct pppoe_tag *tag)
839 {
840 int error, tlen;
841 struct ng_mesg *msg;
842 struct ngpppoe_sts *sts;
843
844 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_ACNAME,
845 sizeof(struct ngpppoe_sts), M_NOWAIT);
846 if (msg == NULL)
847 return (ENOMEM);
848
849 sts = (struct ngpppoe_sts *)msg->data;
850 tlen = min(NG_HOOKSIZ - 1, ntohs(tag->tag_len));
851 strncpy(sts->hook, tag->tag_data, tlen);
852 sts->hook[tlen] = '\0';
853 error = ng_send_msg(sp->hook->node, msg, sp->creator, NULL);
854
855 return (error);
856 }
857
858 static int
send_sessionid(sessp sp)859 send_sessionid(sessp sp)
860 {
861 int error;
862 struct ng_mesg *msg;
863
864 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_SESSIONID,
865 sizeof(u_int16_t), M_NOWAIT);
866 if (msg == NULL)
867 return (ENOMEM);
868
869 *(u_int16_t *)msg->data = sp->Session_ID;
870 error = ng_send_msg(sp->hook->node, msg, sp->creator, NULL);
871
872 return (error);
873 }
874
875 /*
876 * Receive data, and do something with it.
877 * The caller will never free m or meta, so
878 * if we use up this data or abort we must free BOTH of these.
879 */
880 static int
ng_pppoe_rcvdata(hook_p hook,struct mbuf * m,meta_p meta)881 ng_pppoe_rcvdata(hook_p hook, struct mbuf *m, meta_p meta)
882 {
883 node_p node = hook->node;
884 const priv_p privp = node->private;
885 sessp sp = hook->private;
886 const struct pppoe_full_hdr *wh;
887 const struct pppoe_hdr *ph;
888 int error = 0;
889 u_int16_t length;
890 u_int8_t code;
891 const struct pppoe_tag *utag = NULL, *tag = NULL;
892 hook_p sendhook;
893 struct {
894 struct pppoe_tag hdr;
895 union uniq data;
896 } __attribute ((packed)) uniqtag;
897 negp neg = NULL;
898 char ethstr[ETHER_ADDRSTRLEN + 1];
899
900 AAA
901 if (hook->private == &privp->debug_hook) {
902 /*
903 * Data from the debug hook gets sent without modification
904 * straight to the ethernet.
905 */
906 NG_SEND_DATA( error, privp->ethernet_hook, m, meta);
907 privp->packets_out++;
908 } else if (hook->private == &privp->ethernet_hook) {
909 /*
910 * Incoming data.
911 * Dig out various fields from the packet.
912 * use them to decide where to send it.
913 */
914
915 privp->packets_in++;
916 if( m->m_len < sizeof(*wh)) {
917 m = m_pullup(m, sizeof(*wh)); /* Checks length */
918 if (m == NULL) {
919 kprintf("couldn't m_pullup\n");
920 LEAVE(ENOBUFS);
921 }
922 }
923 wh = mtod(m, struct pppoe_full_hdr *);
924 ph = &wh->ph;
925 length = ntohs(wh->ph.length);
926 code = wh->ph.code;
927 switch(wh->eh.ether_type) {
928 case ETHERTYPE_PPPOE_STUPID_DISC:
929 if (pppoe_mode == PPPOE_STANDARD) {
930 pppoe_mode = PPPOE_NONSTANDARD;
931 eh_prototype.ether_type =
932 ETHERTYPE_PPPOE_STUPID_DISC;
933 log(LOG_NOTICE,
934 "Switched to nonstandard PPPoE mode due to "
935 "packet from %s\n",
936 kether_ntoa(wh->eh.ether_shost, ethstr));
937 } else if (pppoe_mode == PPPOE_KEEPSTANDARD)
938 log(LOG_NOTICE,
939 "Ignored nonstandard PPPoE packet "
940 "from %s\n",
941 kether_ntoa(wh->eh.ether_shost, ethstr));
942 /* fall through */
943 case ETHERTYPE_PPPOE_DISC:
944 /*
945 * We need to try to make sure that the tag area
946 * is contiguous, or we could wander off the end
947 * of a buffer and make a mess.
948 * (Linux wouldn't have this problem).
949 */
950 /*XXX fix this mess */
951
952 if (m->m_pkthdr.len <= MHLEN) {
953 if( m->m_len < m->m_pkthdr.len) {
954 m = m_pullup(m, m->m_pkthdr.len);
955 if (m == NULL) {
956 kprintf("couldn't m_pullup\n");
957 LEAVE(ENOBUFS);
958 }
959 }
960 }
961 if (m->m_len != m->m_pkthdr.len) {
962 /*
963 * It's not all in one piece.
964 * We need to do extra work.
965 */
966 kprintf("packet fragmented\n");
967 LEAVE(EMSGSIZE);
968 }
969
970 switch(code) {
971 case PADI_CODE:
972 /*
973 * We are a server:
974 * Look for a hook with the required service
975 * and send the ENTIRE packet up there.
976 * It should come back to a new hook in
977 * PRIMED state. Look there for further
978 * processing.
979 */
980 tag = get_tag(ph, PTT_SRV_NAME);
981 if (tag == NULL) {
982 kprintf("no service tag\n");
983 LEAVE(ENETUNREACH);
984 }
985 sendhook = pppoe_match_svc(hook->node,
986 tag->tag_data, ntohs(tag->tag_len),
987 NG_MATCH_ANY);
988 if (sendhook) {
989 NG_SEND_DATA(error, sendhook, m, meta);
990 } else {
991 LEAVE(ENETUNREACH);
992 }
993 break;
994 case PADO_CODE:
995 /*
996 * We are a client:
997 * Use the host_uniq tag to find the
998 * hook this is in response to.
999 * Received #2, now send #3
1000 * For now simply accept the first we receive.
1001 */
1002 utag = get_tag(ph, PTT_HOST_UNIQ);
1003 if ((utag == NULL)
1004 || (ntohs(utag->tag_len) != sizeof(sp))) {
1005 kprintf("no host unique field\n");
1006 LEAVE(ENETUNREACH);
1007 }
1008
1009 sendhook = pppoe_finduniq(node, utag);
1010 if (sendhook == NULL) {
1011 kprintf("no matching session\n");
1012 LEAVE(ENETUNREACH);
1013 }
1014
1015 /*
1016 * Check the session is in the right state.
1017 * It needs to be in PPPOE_SINIT.
1018 */
1019 sp = sendhook->private;
1020 if (sp->state != PPPOE_SINIT) {
1021 kprintf("session in wrong state\n");
1022 LEAVE(ENETUNREACH);
1023 }
1024 neg = sp->neg;
1025 callout_stop(&neg->timeout_ch);
1026
1027 /*
1028 * This is the first time we hear
1029 * from the server, so note it's
1030 * unicast address, replacing the
1031 * broadcast address .
1032 */
1033 bcopy(wh->eh.ether_shost,
1034 neg->pkt->pkt_header.eh.ether_dhost,
1035 ETHER_ADDR_LEN);
1036 neg->timeout = 0;
1037 neg->pkt->pkt_header.ph.code = PADR_CODE;
1038 init_tags(sp);
1039 insert_tag(sp, utag); /* Host Unique */
1040 if ((tag = get_tag(ph, PTT_AC_COOKIE)))
1041 insert_tag(sp, tag); /* return cookie */
1042 if ((tag = get_tag(ph, PTT_AC_NAME))) {
1043 insert_tag(sp, tag); /* return it */
1044 send_acname(sp, tag);
1045 }
1046 insert_tag(sp, &neg->service.hdr); /* Service */
1047 scan_tags(sp, ph);
1048 make_packet(sp);
1049 sp->state = PPPOE_SREQ;
1050 sendpacket(sp);
1051 break;
1052 case PADR_CODE:
1053
1054 /*
1055 * We are a server:
1056 * Use the ac_cookie tag to find the
1057 * hook this is in response to.
1058 */
1059 utag = get_tag(ph, PTT_AC_COOKIE);
1060 if ((utag == NULL)
1061 || (ntohs(utag->tag_len) != sizeof(sp))) {
1062 LEAVE(ENETUNREACH);
1063 }
1064
1065 sendhook = pppoe_finduniq(node, utag);
1066 if (sendhook == NULL) {
1067 LEAVE(ENETUNREACH);
1068 }
1069
1070 /*
1071 * Check the session is in the right state.
1072 * It needs to be in PPPOE_SOFFER
1073 * or PPPOE_NEWCONNECTED. If the latter,
1074 * then this is a retry by the client.
1075 * so be nice, and resend.
1076 */
1077 sp = sendhook->private;
1078 if (sp->state == PPPOE_NEWCONNECTED) {
1079 /*
1080 * Whoa! drop back to resend that
1081 * PADS packet.
1082 * We should still have a copy of it.
1083 */
1084 sp->state = PPPOE_SOFFER;
1085 }
1086 if (sp->state != PPPOE_SOFFER) {
1087 LEAVE (ENETUNREACH);
1088 break;
1089 }
1090 neg = sp->neg;
1091 callout_stop(&neg->timeout_ch);
1092 neg->pkt->pkt_header.ph.code = PADS_CODE;
1093 if (sp->Session_ID == 0)
1094 neg->pkt->pkt_header.ph.sid =
1095 htons(sp->Session_ID
1096 = get_new_sid(node));
1097 send_sessionid(sp);
1098 neg->timeout = 0;
1099 /*
1100 * start working out the tags to respond with.
1101 */
1102 init_tags(sp);
1103 insert_tag(sp, &neg->ac_name.hdr); /* AC_NAME */
1104 if ((tag = get_tag(ph, PTT_SRV_NAME)))
1105 insert_tag(sp, tag);/* return service */
1106 if ((tag = get_tag(ph, PTT_HOST_UNIQ)))
1107 insert_tag(sp, tag); /* return it */
1108 insert_tag(sp, utag); /* ac_cookie */
1109 scan_tags(sp, ph);
1110 make_packet(sp);
1111 sp->state = PPPOE_NEWCONNECTED;
1112 sendpacket(sp);
1113 /*
1114 * Having sent the last Negotiation header,
1115 * Set up the stored packet header to
1116 * be correct for the actual session.
1117 * But keep the negotialtion stuff
1118 * around in case we need to resend this last
1119 * packet. We'll discard it when we move
1120 * from NEWCONNECTED to CONNECTED
1121 */
1122 sp->pkt_hdr = neg->pkt->pkt_header;
1123 if (pppoe_mode == PPPOE_NONSTANDARD)
1124 sp->pkt_hdr.eh.ether_type
1125 = ETHERTYPE_PPPOE_STUPID_SESS;
1126 else
1127 sp->pkt_hdr.eh.ether_type
1128 = ETHERTYPE_PPPOE_SESS;
1129 sp->pkt_hdr.ph.code = 0;
1130 pppoe_send_event(sp, NGM_PPPOE_SUCCESS);
1131 break;
1132 case PADS_CODE:
1133 /*
1134 * We are a client:
1135 * Use the host_uniq tag to find the
1136 * hook this is in response to.
1137 * take the session ID and store it away.
1138 * Also make sure the pre-made header is
1139 * correct and set us into Session mode.
1140 */
1141 utag = get_tag(ph, PTT_HOST_UNIQ);
1142 if ((utag == NULL)
1143 || (ntohs(utag->tag_len) != sizeof(sp))) {
1144 LEAVE (ENETUNREACH);
1145 break;
1146 }
1147 sendhook = pppoe_finduniq(node, utag);
1148 if (sendhook == NULL) {
1149 LEAVE(ENETUNREACH);
1150 }
1151
1152 /*
1153 * Check the session is in the right state.
1154 * It needs to be in PPPOE_SREQ.
1155 */
1156 sp = sendhook->private;
1157 if (sp->state != PPPOE_SREQ) {
1158 LEAVE(ENETUNREACH);
1159 }
1160 neg = sp->neg;
1161 callout_stop(&neg->timeout_ch);
1162 neg->pkt->pkt_header.ph.sid = wh->ph.sid;
1163 sp->Session_ID = ntohs(wh->ph.sid);
1164 send_sessionid(sp);
1165 neg->timeout = 0;
1166 sp->state = PPPOE_CONNECTED;
1167 /*
1168 * Now we have gone to Connected mode,
1169 * Free all resources needed for
1170 * negotiation.
1171 * Keep a copy of the header we will be using.
1172 */
1173 sp->pkt_hdr = neg->pkt->pkt_header;
1174 if (pppoe_mode == PPPOE_NONSTANDARD)
1175 sp->pkt_hdr.eh.ether_type
1176 = ETHERTYPE_PPPOE_STUPID_SESS;
1177 else
1178 sp->pkt_hdr.eh.ether_type
1179 = ETHERTYPE_PPPOE_SESS;
1180 sp->pkt_hdr.ph.code = 0;
1181 m_freem(neg->m);
1182 kfree(sp->neg, M_NETGRAPH);
1183 sp->neg = NULL;
1184 pppoe_send_event(sp, NGM_PPPOE_SUCCESS);
1185 break;
1186 case PADT_CODE:
1187 /*
1188 * Send a 'close' message to the controlling
1189 * process (the one that set us up);
1190 * And then tear everything down.
1191 *
1192 * Find matching peer/session combination.
1193 */
1194 sendhook = pppoe_findsession(node, wh);
1195 NG_FREE_DATA(m, meta); /* no longer needed */
1196 if (sendhook == NULL) {
1197 LEAVE(ENETUNREACH);
1198 }
1199 /* send message to creator */
1200 /* close hook */
1201 if (sendhook) {
1202 ng_destroy_hook(sendhook);
1203 }
1204 break;
1205 default:
1206 LEAVE(EPFNOSUPPORT);
1207 }
1208 break;
1209 case ETHERTYPE_PPPOE_STUPID_SESS:
1210 case ETHERTYPE_PPPOE_SESS:
1211 /*
1212 * find matching peer/session combination.
1213 */
1214 sendhook = pppoe_findsession(node, wh);
1215 if (sendhook == NULL) {
1216 LEAVE (ENETUNREACH);
1217 break;
1218 }
1219 sp = sendhook->private;
1220 m_adj(m, sizeof(*wh));
1221 if (m->m_pkthdr.len < length) {
1222 /* Packet too short, dump it */
1223 LEAVE(EMSGSIZE);
1224 }
1225
1226 /* Also need to trim excess at the end */
1227 if (m->m_pkthdr.len > length) {
1228 m_adj(m, -((int)(m->m_pkthdr.len - length)));
1229 }
1230 if ( sp->state != PPPOE_CONNECTED) {
1231 if (sp->state == PPPOE_NEWCONNECTED) {
1232 sp->state = PPPOE_CONNECTED;
1233 /*
1234 * Now we have gone to Connected mode,
1235 * Free all resources needed for
1236 * negotiation. Be paranoid about
1237 * whether there may be a timeout.
1238 */
1239 m_freem(sp->neg->m);
1240 callout_stop(&sp->neg->timeout_ch);
1241 kfree(sp->neg, M_NETGRAPH);
1242 sp->neg = NULL;
1243 } else {
1244 LEAVE (ENETUNREACH);
1245 break;
1246 }
1247 }
1248 NG_SEND_DATA( error, sendhook, m, meta);
1249 break;
1250 default:
1251 LEAVE(EPFNOSUPPORT);
1252 }
1253 } else {
1254 /*
1255 * Not ethernet or debug hook..
1256 *
1257 * The packet has come in on a normal hook.
1258 * We need to find out what kind of hook,
1259 * So we can decide how to handle it.
1260 * Check the hook's state.
1261 */
1262 sp = hook->private;
1263 switch (sp->state) {
1264 case PPPOE_NEWCONNECTED:
1265 case PPPOE_CONNECTED: {
1266 static const u_char addrctrl[] = { 0xff, 0x03 };
1267 struct pppoe_full_hdr *wh;
1268
1269 /*
1270 * Remove PPP address and control fields, if any.
1271 * For example, ng_ppp(4) always sends LCP packets
1272 * with address and control fields as required by
1273 * generic PPP. PPPoE is an exception to the rule.
1274 */
1275 if (m->m_pkthdr.len >= 2) {
1276 if (m->m_len < 2 && !(m = m_pullup(m, 2)))
1277 LEAVE(ENOBUFS);
1278 if (bcmp(mtod(m, u_char *), addrctrl, 2) == 0)
1279 m_adj(m, 2);
1280 }
1281 /*
1282 * Bang in a pre-made header, and set the length up
1283 * to be correct. Then send it to the ethernet driver.
1284 * But first correct the length.
1285 */
1286 sp->pkt_hdr.ph.length = htons((short)(m->m_pkthdr.len));
1287 M_PREPEND(m, sizeof(*wh), M_NOWAIT);
1288 if (m == NULL) {
1289 LEAVE(ENOBUFS);
1290 }
1291 wh = mtod(m, struct pppoe_full_hdr *);
1292 bcopy(&sp->pkt_hdr, wh, sizeof(*wh));
1293 NG_SEND_DATA( error, privp->ethernet_hook, m, meta);
1294 privp->packets_out++;
1295 break;
1296 }
1297 case PPPOE_PRIMED:
1298 /*
1299 * A PADI packet is being returned by the application
1300 * that has set up this hook. This indicates that it
1301 * wants us to offer service.
1302 */
1303 neg = sp->neg;
1304 if (m->m_len < sizeof(*wh)) {
1305 m = m_pullup(m, sizeof(*wh));
1306 if (m == NULL) {
1307 LEAVE(ENOBUFS);
1308 }
1309 }
1310 wh = mtod(m, struct pppoe_full_hdr *);
1311 ph = &wh->ph;
1312 length = ntohs(wh->ph.length);
1313 code = wh->ph.code;
1314 if ( code != PADI_CODE) {
1315 LEAVE(EINVAL);
1316 }
1317 callout_stop(&neg->timeout_ch);
1318
1319 /*
1320 * This is the first time we hear
1321 * from the client, so note it's
1322 * unicast address, replacing the
1323 * broadcast address.
1324 */
1325 bcopy(wh->eh.ether_shost,
1326 neg->pkt->pkt_header.eh.ether_dhost,
1327 ETHER_ADDR_LEN);
1328 sp->state = PPPOE_SOFFER;
1329 neg->timeout = 0;
1330 neg->pkt->pkt_header.ph.code = PADO_CODE;
1331
1332 /*
1333 * start working out the tags to respond with.
1334 */
1335 uniqtag.hdr.tag_type = PTT_AC_COOKIE;
1336 uniqtag.hdr.tag_len = htons((u_int16_t)sizeof(sp));
1337 uniqtag.data.pointer = sp;
1338 init_tags(sp);
1339 insert_tag(sp, &neg->ac_name.hdr); /* AC_NAME */
1340 if ((tag = get_tag(ph, PTT_SRV_NAME)))
1341 insert_tag(sp, tag); /* return service */
1342 /*
1343 * If we have a NULL service request
1344 * and have an extra service defined in this hook,
1345 * then also add a tag for the extra service.
1346 * XXX this is a hack. eventually we should be able
1347 * to support advertising many services, not just one
1348 */
1349 if (((tag == NULL) || (tag->tag_len == 0))
1350 && (neg->service.hdr.tag_len != 0)) {
1351 insert_tag(sp, &neg->service.hdr); /* SERVICE */
1352 }
1353 if ((tag = get_tag(ph, PTT_HOST_UNIQ)))
1354 insert_tag(sp, tag); /* returned hostunique */
1355 insert_tag(sp, &uniqtag.hdr);
1356 scan_tags(sp, ph);
1357 make_packet(sp);
1358 sendpacket(sp);
1359 break;
1360
1361 /*
1362 * Packets coming from the hook make no sense
1363 * to sessions in these states. Throw them away.
1364 */
1365 case PPPOE_SINIT:
1366 case PPPOE_SREQ:
1367 case PPPOE_SOFFER:
1368 case PPPOE_SNONE:
1369 case PPPOE_LISTENING:
1370 case PPPOE_DEAD:
1371 default:
1372 LEAVE(ENETUNREACH);
1373 }
1374 }
1375 quit:
1376 NG_FREE_DATA(m, meta);
1377 return error;
1378 }
1379
1380 /*
1381 * Do local shutdown processing..
1382 * If we are a persistant device, we might refuse to go away, and
1383 * we'd only remove our links and reset ourself.
1384 */
1385 static int
ng_pppoe_rmnode(node_p node)1386 ng_pppoe_rmnode(node_p node)
1387 {
1388 const priv_p privdata = node->private;
1389
1390 AAA
1391 node->flags |= NG_INVALID;
1392 ng_cutlinks(node);
1393 ng_unname(node);
1394 node->private = NULL;
1395 ng_unref(privdata->node);
1396 kfree(privdata, M_NETGRAPH);
1397 return (0);
1398 }
1399
1400 /*
1401 * This is called once we've already connected a new hook to the other node.
1402 * It gives us a chance to balk at the last minute.
1403 */
1404 static int
ng_pppoe_connect(hook_p hook)1405 ng_pppoe_connect(hook_p hook)
1406 {
1407 /* be really amiable and just say "YUP that's OK by me! " */
1408 return (0);
1409 }
1410
1411 /*
1412 * Hook disconnection
1413 *
1414 * Clean up all dangling links and information about the session/hook.
1415 * For this type, removal of the last link destroys the node
1416 */
1417 static int
ng_pppoe_disconnect(hook_p hook)1418 ng_pppoe_disconnect(hook_p hook)
1419 {
1420 node_p node = hook->node;
1421 priv_p privp = node->private;
1422 sessp sp;
1423 int hooks;
1424
1425 AAA
1426 hooks = node->numhooks; /* this one already not counted */
1427 if (hook->private == &privp->debug_hook) {
1428 privp->debug_hook = NULL;
1429 } else if (hook->private == &privp->ethernet_hook) {
1430 privp->ethernet_hook = NULL;
1431 ng_rmnode(node);
1432 } else {
1433 sp = hook->private;
1434 if (sp->state != PPPOE_SNONE ) {
1435 pppoe_send_event(sp, NGM_PPPOE_CLOSE);
1436 }
1437 /*
1438 * According to the spec, if we are connected,
1439 * we should send a DISC packet if we are shutting down
1440 * a session.
1441 */
1442 if ((privp->ethernet_hook)
1443 && ((sp->state == PPPOE_CONNECTED)
1444 || (sp->state == PPPOE_NEWCONNECTED))) {
1445 struct mbuf *m;
1446 struct pppoe_full_hdr *wh;
1447 struct pppoe_tag *tag;
1448 int msglen = strlen(SIGNOFF);
1449 void *dummy = NULL;
1450 int error = 0;
1451
1452 /* revert the stored header to DISC/PADT mode */
1453 wh = &sp->pkt_hdr;
1454 wh->ph.code = PADT_CODE;
1455 if (pppoe_mode == PPPOE_NONSTANDARD)
1456 wh->eh.ether_type = ETHERTYPE_PPPOE_STUPID_DISC;
1457 else
1458 wh->eh.ether_type = ETHERTYPE_PPPOE_DISC;
1459
1460 /* generate a packet of that type */
1461 MGETHDR(m, M_NOWAIT, MT_DATA);
1462 if(m == NULL)
1463 kprintf("pppoe: Session out of mbufs\n");
1464 else {
1465 m->m_pkthdr.rcvif = NULL;
1466 m->m_pkthdr.len = m->m_len = sizeof(*wh);
1467 bcopy((caddr_t)wh, mtod(m, caddr_t),
1468 sizeof(*wh));
1469 /*
1470 * Add a General error message and adjust
1471 * sizes
1472 */
1473 wh = mtod(m, struct pppoe_full_hdr *);
1474 tag = wh->ph.tag;
1475 tag->tag_type = PTT_GEN_ERR;
1476 tag->tag_len = htons((u_int16_t)msglen);
1477 strncpy(tag->tag_data, SIGNOFF, msglen);
1478 m->m_pkthdr.len = (m->m_len += sizeof(*tag) +
1479 msglen);
1480 wh->ph.length = htons(sizeof(*tag) + msglen);
1481 NG_SEND_DATA(error, privp->ethernet_hook, m,
1482 dummy);
1483 }
1484 }
1485 /*
1486 * As long as we have somewhere to store the timeout handle,
1487 * we may have a timeout pending.. get rid of it.
1488 */
1489 if (sp->neg) {
1490 callout_stop(&sp->neg->timeout_ch);
1491 if (sp->neg->m)
1492 m_freem(sp->neg->m);
1493 kfree(sp->neg, M_NETGRAPH);
1494 }
1495 kfree(sp, M_NETGRAPH);
1496 hook->private = NULL;
1497 /* work out how many session hooks there are */
1498 /* Node goes away on last session hook removal */
1499 if (privp->ethernet_hook) hooks -= 1;
1500 if (privp->debug_hook) hooks -= 1;
1501 }
1502 if (node->numhooks == 0)
1503 ng_rmnode(node);
1504 return (0);
1505 }
1506
1507 /*
1508 * timeouts come here.
1509 */
1510 static void
pppoe_ticker(void * arg)1511 pppoe_ticker(void *arg)
1512 {
1513 hook_p hook = arg;
1514 sessp sp = hook->private;
1515 negp neg = sp->neg;
1516 int error = 0;
1517 struct mbuf *m0 = NULL;
1518 priv_p privp = hook->node->private;
1519 meta_p dummy = NULL;
1520
1521 crit_enter();
1522 AAA
1523 switch(sp->state) {
1524 /*
1525 * resend the last packet, using an exponential backoff.
1526 * After a period of time, stop growing the backoff,
1527 * and either leave it, or revert to the start.
1528 */
1529 case PPPOE_SINIT:
1530 case PPPOE_SREQ:
1531 /* timeouts on these produce resends */
1532 m0 = m_copypacket(sp->neg->m, M_NOWAIT);
1533 NG_SEND_DATA( error, privp->ethernet_hook, m0, dummy);
1534 callout_reset(&neg->timeout_ch, neg->timeout * hz,
1535 pppoe_ticker, hook);
1536 if ((neg->timeout <<= 1) > PPPOE_TIMEOUT_LIMIT) {
1537 if (sp->state == PPPOE_SREQ) {
1538 /* revert to SINIT mode */
1539 pppoe_start(sp);
1540 } else {
1541 neg->timeout = PPPOE_TIMEOUT_LIMIT;
1542 }
1543 }
1544 break;
1545 case PPPOE_PRIMED:
1546 case PPPOE_SOFFER:
1547 /* a timeout on these says "give up" */
1548 ng_destroy_hook(hook);
1549 break;
1550 default:
1551 /* timeouts have no meaning in other states */
1552 kprintf("pppoe: unexpected timeout\n");
1553 }
1554 crit_exit();
1555 }
1556
1557
1558 static void
sendpacket(sessp sp)1559 sendpacket(sessp sp)
1560 {
1561 int error = 0;
1562 struct mbuf *m0 = NULL;
1563 hook_p hook = sp->hook;
1564 negp neg = sp->neg;
1565 priv_p privp = hook->node->private;
1566 meta_p dummy = NULL;
1567
1568 AAA
1569 switch(sp->state) {
1570 case PPPOE_LISTENING:
1571 case PPPOE_DEAD:
1572 case PPPOE_SNONE:
1573 case PPPOE_CONNECTED:
1574 kprintf("pppoe: sendpacket: unexpected state\n");
1575 break;
1576
1577 case PPPOE_NEWCONNECTED:
1578 /* send the PADS without a timeout - we're now connected */
1579 m0 = m_copypacket(sp->neg->m, M_NOWAIT);
1580 NG_SEND_DATA( error, privp->ethernet_hook, m0, dummy);
1581 break;
1582
1583 case PPPOE_PRIMED:
1584 /* No packet to send, but set up the timeout */
1585 callout_reset(&neg->timeout_ch, PPPOE_OFFER_TIMEOUT * hz,
1586 pppoe_ticker, hook);
1587 break;
1588
1589 case PPPOE_SOFFER:
1590 /*
1591 * send the offer but if they don't respond
1592 * in PPPOE_OFFER_TIMEOUT seconds, forget about it.
1593 */
1594 m0 = m_copypacket(sp->neg->m, M_NOWAIT);
1595 NG_SEND_DATA( error, privp->ethernet_hook, m0, dummy);
1596 callout_reset(&neg->timeout_ch, PPPOE_OFFER_TIMEOUT * hz,
1597 pppoe_ticker, hook);
1598 break;
1599
1600 case PPPOE_SINIT:
1601 case PPPOE_SREQ:
1602 m0 = m_copypacket(sp->neg->m, M_NOWAIT);
1603 NG_SEND_DATA( error, privp->ethernet_hook, m0, dummy);
1604 callout_reset(&neg->timeout_ch, PPPOE_INITIAL_TIMEOUT * hz,
1605 pppoe_ticker, hook);
1606 neg->timeout = PPPOE_INITIAL_TIMEOUT * 2;
1607 break;
1608
1609 default:
1610 error = EINVAL;
1611 kprintf("pppoe: timeout: bad state\n");
1612 }
1613 /* return (error); */
1614 }
1615
1616 /*
1617 * Parse an incoming packet to see if any tags should be copied to the
1618 * output packet. Don't do any tags that have been handled in the main
1619 * state machine.
1620 */
1621 static const struct pppoe_tag*
scan_tags(sessp sp,const struct pppoe_hdr * ph)1622 scan_tags(sessp sp, const struct pppoe_hdr* ph)
1623 {
1624 const char *const end = (const char *)next_tag(ph);
1625 const char *ptn;
1626 const struct pppoe_tag *pt = &ph->tag[0];
1627 /*
1628 * Keep processing tags while a tag header will still fit.
1629 */
1630 AAA
1631 while((const char*)(pt + 1) <= end) {
1632 /*
1633 * If the tag data would go past the end of the packet, abort.
1634 */
1635 ptn = (((const char *)(pt + 1)) + ntohs(pt->tag_len));
1636 if(ptn > end)
1637 return NULL;
1638
1639 switch (pt->tag_type) {
1640 case PTT_RELAY_SID:
1641 insert_tag(sp, pt);
1642 break;
1643 case PTT_EOL:
1644 return NULL;
1645 case PTT_SRV_NAME:
1646 case PTT_AC_NAME:
1647 case PTT_HOST_UNIQ:
1648 case PTT_AC_COOKIE:
1649 case PTT_VENDOR:
1650 case PTT_SRV_ERR:
1651 case PTT_SYS_ERR:
1652 case PTT_GEN_ERR:
1653 break;
1654 }
1655 pt = (const struct pppoe_tag*)ptn;
1656 }
1657 return NULL;
1658 }
1659
1660 static int
pppoe_send_event(sessp sp,enum cmd cmdid)1661 pppoe_send_event(sessp sp, enum cmd cmdid)
1662 {
1663 int error;
1664 struct ng_mesg *msg;
1665 struct ngpppoe_sts *sts;
1666
1667 AAA
1668 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, cmdid,
1669 sizeof(struct ngpppoe_sts), M_NOWAIT);
1670 if (msg == NULL)
1671 return (ENOMEM);
1672 sts = (struct ngpppoe_sts *)msg->data;
1673 strlcpy(sts->hook, sp->hook->name, NG_HOOKSIZ);
1674 error = ng_send_msg(sp->hook->node, msg, sp->creator, NULL);
1675 return (error);
1676 }
1677