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kernel: Remove some unused variables in netgraph/netgraph7.
[dragonfly.git] / sys / netgraph / pppoe / ng_pppoe.c
blobabfaf72df45d9033e7698661a6e9af56e1a5ff60
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 #include <net/ethernet.h>
60
61 #include <netgraph/ng_message.h>
62 #include <netgraph/netgraph.h>
63 #include "ng_pppoe.h"
64
65 #define SIGNOFF "session closed"
66
67 /*
68 * This section contains the netgraph method declarations for the
69 * pppoe node. These methods define the netgraph pppoe 'type'.
70 */
71
72 static ng_constructor_t ng_pppoe_constructor;
73 static ng_rcvmsg_t ng_pppoe_rcvmsg;
74 static ng_shutdown_t ng_pppoe_rmnode;
75 static ng_newhook_t ng_pppoe_newhook;
76 static ng_connect_t ng_pppoe_connect;
77 static ng_rcvdata_t ng_pppoe_rcvdata;
78 static ng_disconnect_t ng_pppoe_disconnect;
79
80 /* Netgraph node type descriptor */
81 static struct ng_type typestruct = {
82 NG_VERSION,
83 NG_PPPOE_NODE_TYPE,
84 NULL,
85 ng_pppoe_constructor,
86 ng_pppoe_rcvmsg,
87 ng_pppoe_rmnode,
88 ng_pppoe_newhook,
89 NULL,
90 ng_pppoe_connect,
91 ng_pppoe_rcvdata,
92 ng_pppoe_rcvdata,
93 ng_pppoe_disconnect,
94 NULL
95 };
96 NETGRAPH_INIT(pppoe, &typestruct);
97
98 /*
99 * States for the session state machine.
100 * These have no meaning if there is no hook attached yet.
101 */
102 enum state {
103 PPPOE_SNONE=0, /* [both] Initial state */
104 PPPOE_LISTENING, /* [Daemon] Listening for discover initiation pkt */
105 PPPOE_SINIT, /* [Client] Sent discovery initiation */
106 PPPOE_PRIMED, /* [Server] Awaiting PADI from daemon */
107 PPPOE_SOFFER, /* [Server] Sent offer message (got PADI)*/
108 PPPOE_SREQ, /* [Client] Sent a Request */
109 PPPOE_NEWCONNECTED, /* [Server] Connection established, No data received */
110 PPPOE_CONNECTED, /* [Both] Connection established, Data received */
111 PPPOE_DEAD /* [Both] */
112 };
113
114 #define NUMTAGS 20 /* number of tags we are set up to work with */
115
116 /*
117 * Information we store for each hook on each node for negotiating the
118 * session. The mbuf and cluster are freed once negotiation has completed.
119 * The whole negotiation block is then discarded.
120 */
121
122 struct sess_neg {
123 struct mbuf *m; /* holds cluster with last sent packet */
124 union packet *pkt; /* points within the above cluster */
125 struct callout timeout_ch;
126 u_int timeout; /* 0,1,2,4,8,16 etc. seconds */
127 u_int numtags;
128 const struct pppoe_tag *tags[NUMTAGS];
129 u_int service_len;
130 u_int ac_name_len;
131
132 struct datatag service;
133 struct datatag ac_name;
134 };
135 typedef struct sess_neg *negp;
136
137 /*
138 * Session information that is needed after connection.
139 */
140 struct sess_con {
141 hook_p hook;
142 u_int16_t Session_ID;
143 enum state state;
144 char creator[NG_NODESIZ]; /* who to notify */
145 struct pppoe_full_hdr pkt_hdr; /* used when connected */
146 negp neg; /* used when negotiating */
147 /*struct sess_con *hash_next;*/ /* not yet used */
148 };
149 typedef struct sess_con *sessp;
150
151 /*
152 * Information we store for each node
153 */
154 struct PPPOE {
155 node_p node; /* back pointer to node */
156 hook_p ethernet_hook;
157 hook_p debug_hook;
158 u_int packets_in; /* packets in from ethernet */
159 u_int packets_out; /* packets out towards ethernet */
160 u_int32_t flags;
161 /*struct sess_con *buckets[HASH_SIZE];*/ /* not yet used */
162 };
163 typedef struct PPPOE *priv_p;
164
165 struct ether_header eh_prototype =
166 {{0xff,0xff,0xff,0xff,0xff,0xff},
167 {0x00,0x00,0x00,0x00,0x00,0x00},
168 ETHERTYPE_PPPOE_DISC};
169
170 #define PPPOE_KEEPSTANDARD -1 /* never switch to nonstandard mode */
171 #define PPPOE_STANDARD 0 /* try standard mode (dangerous!) */
172 #define PPPOE_NONSTANDARD 1 /* just be in nonstandard mode */
173 static int pppoe_mode = PPPOE_KEEPSTANDARD;
174
175 static int
176 ngpppoe_set_ethertype(SYSCTL_HANDLER_ARGS)
177 {
178 int error;
179 int val;
180
181 val = pppoe_mode;
182 error = sysctl_handle_int(oidp, &val, sizeof(int), req);
183 if (error != 0 || req->newptr == NULL)
184 return (error);
185 switch (val) {
186 case PPPOE_NONSTANDARD:
187 pppoe_mode = PPPOE_NONSTANDARD;
188 eh_prototype.ether_type = ETHERTYPE_PPPOE_STUPID_DISC;
189 break;
190 case PPPOE_STANDARD:
191 pppoe_mode = PPPOE_STANDARD;
192 eh_prototype.ether_type = ETHERTYPE_PPPOE_DISC;
193 break;
194 case PPPOE_KEEPSTANDARD:
195 pppoe_mode = PPPOE_KEEPSTANDARD;
196 eh_prototype.ether_type = ETHERTYPE_PPPOE_DISC;
197 break;
198 default:
199 return (EINVAL);
200 }
201 return (0);
202 }
203
204 SYSCTL_PROC(_net_graph, OID_AUTO, nonstandard_pppoe, CTLTYPE_INT | CTLFLAG_RW,
205 0, sizeof(int), ngpppoe_set_ethertype, "I", "nonstandard ethertype");
206
207 union uniq {
208 char bytes[sizeof(void *)];
209 void * pointer;
210 };
211
212 #define LEAVE(x) do { error = x; goto quit; } while(0)
213 static void pppoe_start(sessp sp);
214 static void sendpacket(sessp sp);
215 static void pppoe_ticker(void *arg);
216 static const struct pppoe_tag *scan_tags(sessp sp,
217 const struct pppoe_hdr* ph);
218 static int pppoe_send_event(sessp sp, enum cmd cmdid);
219
220 /*************************************************************************
221 * Some basic utilities from the Linux version with author's permission.*
222 * Author: Michal Ostrowski <mostrows@styx.uwaterloo.ca> *
223 ************************************************************************/
224
225 /*
226 * Generate a new session id
227 * XXX find out the FreeBSD locking scheme.
228 */
229 static u_int16_t
230 get_new_sid(node_p node)
231 {
232 static int pppoe_sid = 10;
233 sessp sp;
234 hook_p hook;
235 u_int16_t val;
236 priv_p privp = node->private;
237
238 AAA
239 restart:
240 val = pppoe_sid++;
241 /*
242 * Spec says 0xFFFF is reserved.
243 * Also don't use 0x0000
244 */
245 if (val == 0xffff) {
246 pppoe_sid = 20;
247 goto restart;
248 }
249
250 /* Check it isn't already in use */
251 LIST_FOREACH(hook, &node->hooks, hooks) {
252 /* don't check special hooks */
253 if ((hook->private == &privp->debug_hook)
254 || (hook->private == &privp->ethernet_hook))
255 continue;
256 sp = hook->private;
257 if (sp->Session_ID == val)
258 goto restart;
259 }
260
261 return val;
262 }
263
264
265 /*
266 * Return the location where the next tag can be put
267 */
268 static __inline const struct pppoe_tag*
269 next_tag(const struct pppoe_hdr* ph)
270 {
271 return (const struct pppoe_tag*)(((const char*)&ph->tag[0])
272 + ntohs(ph->length));
273 }
274
275 /*
276 * Look for a tag of a specific type
277 * Don't trust any length the other end says.
278 * but assume we already sanity checked ph->length.
279 */
280 static const struct pppoe_tag*
281 get_tag(const struct pppoe_hdr* ph, u_int16_t idx)
282 {
283 const char *const end = (const char *)next_tag(ph);
284 const char *ptn;
285 const struct pppoe_tag *pt = &ph->tag[0];
286 /*
287 * Keep processing tags while a tag header will still fit.
288 */
289 AAA
290 while((const char*)(pt + 1) <= end) {
291 /*
292 * If the tag data would go past the end of the packet, abort.
293 */
294 ptn = (((const char *)(pt + 1)) + ntohs(pt->tag_len));
295 if(ptn > end)
296 return NULL;
297
298 if(pt->tag_type == idx)
299 return pt;
300
301 pt = (const struct pppoe_tag*)ptn;
302 }
303 return NULL;
304 }
305
306 /**************************************************************************
307 * inlines to initialise or add tags to a session's tag list,
308 **************************************************************************/
309 /*
310 * Initialise the session's tag list
311 */
312 static void
313 init_tags(sessp sp)
314 {
315 AAA
316 if(sp->neg == NULL) {
317 kprintf("pppoe: asked to init NULL neg pointer\n");
318 return;
319 }
320 sp->neg->numtags = 0;
321 }
322
323 static void
324 insert_tag(sessp sp, const struct pppoe_tag *tp)
325 {
326 int i;
327 negp neg;
328
329 AAA
330 if((neg = sp->neg) == NULL) {
331 kprintf("pppoe: asked to use NULL neg pointer\n");
332 return;
333 }
334 if ((i = neg->numtags++) < NUMTAGS) {
335 neg->tags[i] = tp;
336 } else {
337 kprintf("pppoe: asked to add too many tags to packet\n");
338 neg->numtags--;
339 }
340 }
341
342 /*
343 * Make up a packet, using the tags filled out for the session.
344 *
345 * Assume that the actual pppoe header and ethernet header
346 * are filled out externally to this routine.
347 * Also assume that neg->wh points to the correct
348 * location at the front of the buffer space.
349 */
350 static void
351 make_packet(sessp sp) {
352 struct pppoe_full_hdr *wh = &sp->neg->pkt->pkt_header;
353 const struct pppoe_tag **tag;
354 char *dp;
355 int count;
356 int tlen;
357 u_int16_t length = 0;
358
359 AAA
360 if ((sp->neg == NULL) || (sp->neg->m == NULL)) {
361 kprintf("pppoe: make_packet called from wrong state\n");
362 }
363 dp = (char *)wh->ph.tag;
364 for (count = 0, tag = sp->neg->tags;
365 ((count < sp->neg->numtags) && (count < NUMTAGS));
366 tag++, count++) {
367 tlen = ntohs((*tag)->tag_len) + sizeof(**tag);
368 if ((length + tlen) > (ETHER_MAX_LEN - 4 - sizeof(*wh))) {
369 kprintf("pppoe: tags too long\n");
370 sp->neg->numtags = count;
371 break; /* XXX chop off what's too long */
372 }
373 bcopy(*tag, dp, tlen);
374 length += tlen;
375 dp += tlen;
376 }
377 wh->ph.length = htons(length);
378 sp->neg->m->m_len = length + sizeof(*wh);
379 sp->neg->m->m_pkthdr.len = length + sizeof(*wh);
380 }
381
382 /**************************************************************************
383 * Routine to match a service offered *
384 **************************************************************************/
385 /*
386 * Find a hook that has a service string that matches that
387 * we are seeking. for now use a simple string.
388 * In the future we may need something like regexp().
389 * for testing allow a null string to match 1st found and a null service
390 * to match all requests. Also make '*' do the same.
391 */
392
393 #define NG_MATCH_EXACT 1
394 #define NG_MATCH_ANY 2
395
396 static hook_p
397 pppoe_match_svc(node_p node, const char *svc_name, int svc_len, int match)
398 {
399 sessp sp = NULL;
400 negp neg = NULL;
401 priv_p privp = node->private;
402 hook_p allhook = NULL;
403 hook_p hook;
404
405 AAA
406 LIST_FOREACH(hook, &node->hooks, hooks) {
407
408 /* skip any hook that is debug or ethernet */
409 if ((hook->private == &privp->debug_hook)
410 || (hook->private == &privp->ethernet_hook))
411 continue;
412 sp = hook->private;
413
414 /* Skip any sessions which are not in LISTEN mode. */
415 if ( sp->state != PPPOE_LISTENING)
416 continue;
417
418 neg = sp->neg;
419
420 /* Special case for a blank or "*" service name (wildcard) */
421 if (match == NG_MATCH_ANY && neg->service_len == 1 &&
422 neg->service.data[0] == '*') {
423 allhook = hook;
424 continue;
425 }
426
427 /* If the lengths don't match, that aint it. */
428 if (neg->service_len != svc_len)
429 continue;
430
431 /* An exact match? */
432 if (svc_len == 0)
433 break;
434
435 if (strncmp(svc_name, neg->service.data, svc_len) == 0)
436 break;
437 }
438 return (hook ? hook : allhook);
439 }
440 /**************************************************************************
441 * Routine to find a particular session that matches an incoming packet *
442 **************************************************************************/
443 static hook_p
444 pppoe_findsession(node_p node, const struct pppoe_full_hdr *wh)
445 {
446 sessp sp = NULL;
447 hook_p hook = NULL;
448 priv_p privp = node->private;
449 u_int16_t session = ntohs(wh->ph.sid);
450
451 /*
452 * find matching peer/session combination.
453 */
454 AAA
455 LIST_FOREACH(hook, &node->hooks, hooks) {
456 /* don't check special hooks */
457 if ((hook->private == &privp->debug_hook)
458 || (hook->private == &privp->ethernet_hook)) {
459 continue;
460 }
461 sp = hook->private;
462 if ( ( (sp->state == PPPOE_CONNECTED)
463 || (sp->state == PPPOE_NEWCONNECTED) )
464 && (sp->Session_ID == session)
465 && (bcmp(sp->pkt_hdr.eh.ether_dhost,
466 wh->eh.ether_shost,
467 ETHER_ADDR_LEN)) == 0) {
468 break;
469 }
470 }
471 return (hook);
472 }
473
474 static hook_p
475 pppoe_finduniq(node_p node, const struct pppoe_tag *tag)
476 {
477 hook_p hook = NULL;
478 priv_p privp = node->private;
479 union uniq uniq;
480
481 AAA
482 bcopy(tag->tag_data, uniq.bytes, sizeof(void *));
483 /* cycle through all known hooks */
484 LIST_FOREACH(hook, &node->hooks, hooks) {
485 /* don't check special hooks */
486 if ((hook->private == &privp->debug_hook)
487 || (hook->private == &privp->ethernet_hook))
488 continue;
489 if (uniq.pointer == hook->private)
490 break;
491 }
492 return (hook);
493 }
494
495 /**************************************************************************
496 * start of Netgraph entrypoints *
497 **************************************************************************/
498
499 /*
500 * Allocate the private data structure and the generic node
501 * and link them together.
502 *
503 * ng_make_node_common() returns with a generic node struct
504 * with a single reference for us.. we transfer it to the
505 * private structure.. when we free the private struct we must
506 * unref the node so it gets freed too.
507 */
508 static int
509 ng_pppoe_constructor(node_p *nodep)
510 {
511 priv_p privdata;
512 int error;
513
514 AAA
515 /* Initialize private descriptor */
516 privdata = kmalloc(sizeof(*privdata), M_NETGRAPH, M_NOWAIT | M_ZERO);
517 if (privdata == NULL)
518 return (ENOMEM);
519
520 /* Call the 'generic' (ie, superclass) node constructor */
521 if ((error = ng_make_node_common(&typestruct, nodep))) {
522 kfree(privdata, M_NETGRAPH);
523 return (error);
524 }
525
526 /* Link structs together; this counts as our one reference to *nodep */
527 (*nodep)->private = privdata;
528 privdata->node = *nodep;
529 return (0);
530 }
531
532 /*
533 * Give our ok for a hook to be added...
534 * point the hook's private info to the hook structure.
535 *
536 * The following hook names are special:
537 * Ethernet: the hook that should be connected to a NIC.
538 * debug: copies of data sent out here (when I write the code).
539 * All other hook names need only be unique. (the framework checks this).
540 */
541 static int
542 ng_pppoe_newhook(node_p node, hook_p hook, const char *name)
543 {
544 const priv_p privp = node->private;
545 sessp sp;
546
547 AAA
548 if (strcmp(name, NG_PPPOE_HOOK_ETHERNET) == 0) {
549 privp->ethernet_hook = hook;
550 hook->private = &privp->ethernet_hook;
551 } else if (strcmp(name, NG_PPPOE_HOOK_DEBUG) == 0) {
552 privp->debug_hook = hook;
553 hook->private = &privp->debug_hook;
554 } else {
555 /*
556 * Any other unique name is OK.
557 * The infrastructure has already checked that it's unique,
558 * so just allocate it and hook it in.
559 */
560 sp = kmalloc(sizeof(*sp), M_NETGRAPH, M_NOWAIT | M_ZERO);
561 if (sp == NULL)
562 return (ENOMEM);
563
564 hook->private = sp;
565 sp->hook = hook;
566 }
567 return(0);
568 }
569
570 /*
571 * Get a netgraph control message.
572 * Check it is one we understand. If needed, send a response.
573 * We sometimes save the address for an async action later.
574 * Always free the message.
575 */
576 static int
577 ng_pppoe_rcvmsg(node_p node,
578 struct ng_mesg *msg, const char *retaddr, struct ng_mesg **rptr)
579 {
580 priv_p privp = node->private;
581 struct ngpppoe_init_data *ourmsg = NULL;
582 struct ng_mesg *resp = NULL;
583 int error = 0;
584 hook_p hook = NULL;
585 sessp sp = NULL;
586 negp neg = NULL;
587
588 AAA
589 /* Deal with message according to cookie and command */
590 switch (msg->header.typecookie) {
591 case NGM_PPPOE_COOKIE:
592 switch (msg->header.cmd) {
593 case NGM_PPPOE_CONNECT:
594 case NGM_PPPOE_LISTEN:
595 case NGM_PPPOE_OFFER:
596 case NGM_PPPOE_SERVICE:
597 ourmsg = (struct ngpppoe_init_data *)msg->data;
598 if (( sizeof(*ourmsg) > msg->header.arglen)
599 || ((sizeof(*ourmsg) + ourmsg->data_len)
600 > msg->header.arglen)) {
601 kprintf("pppoe_rcvmsg: bad arg size");
602 LEAVE(EMSGSIZE);
603 }
604 if (ourmsg->data_len > PPPOE_SERVICE_NAME_SIZE) {
605 kprintf("pppoe: init data too long (%d)\n",
606 ourmsg->data_len);
607 LEAVE(EMSGSIZE);
608 }
609 /* make sure strcmp will terminate safely */
610 ourmsg->hook[sizeof(ourmsg->hook) - 1] = '\0';
611
612 /* cycle through all known hooks */
613 LIST_FOREACH(hook, &node->hooks, hooks) {
614 if (hook->name
615 && strcmp(hook->name, ourmsg->hook) == 0)
616 break;
617 }
618 if (hook == NULL) {
619 LEAVE(ENOENT);
620 }
621 if ((hook->private == &privp->debug_hook)
622 || (hook->private == &privp->ethernet_hook)) {
623 LEAVE(EINVAL);
624 }
625 sp = hook->private;
626
627 if (msg->header.cmd == NGM_PPPOE_LISTEN) {
628 /*
629 * Ensure we aren't already listening for this
630 * service.
631 */
632 if (pppoe_match_svc(node, ourmsg->data,
633 ourmsg->data_len, NG_MATCH_EXACT) != NULL) {
634 LEAVE(EEXIST);
635 }
636 }
637
638 /*
639 * PPPOE_SERVICE advertisments are set up
640 * on sessions that are in PRIMED state.
641 */
642 if (msg->header.cmd == NGM_PPPOE_SERVICE) {
643 break;
644 }
645 if (sp->state != PPPOE_SNONE) {
646 kprintf("pppoe: Session already active\n");
647 LEAVE(EISCONN);
648 }
649
650 /*
651 * set up prototype header
652 */
653 neg = kmalloc(sizeof(*neg), M_NETGRAPH,
654 M_NOWAIT | M_ZERO);
655
656 if (neg == NULL) {
657 kprintf("pppoe: Session out of memory\n");
658 LEAVE(ENOMEM);
659 }
660 MGETHDR(neg->m, MB_DONTWAIT, MT_DATA);
661 if(neg->m == NULL) {
662 kprintf("pppoe: Session out of mbufs\n");
663 kfree(neg, M_NETGRAPH);
664 LEAVE(ENOBUFS);
665 }
666 neg->m->m_pkthdr.rcvif = NULL;
667 MCLGET(neg->m, MB_DONTWAIT);
668 if ((neg->m->m_flags & M_EXT) == 0) {
669 kprintf("pppoe: Session out of mcls\n");
670 m_freem(neg->m);
671 kfree(neg, M_NETGRAPH);
672 LEAVE(ENOBUFS);
673 }
674 sp->neg = neg;
675 callout_init(&neg->timeout_ch);
676 neg->m->m_len = sizeof(struct pppoe_full_hdr);
677 neg->pkt = mtod(neg->m, union packet*);
678 neg->pkt->pkt_header.eh = eh_prototype;
679 neg->pkt->pkt_header.ph.ver = 0x1;
680 neg->pkt->pkt_header.ph.type = 0x1;
681 neg->pkt->pkt_header.ph.sid = 0x0000;
682 neg->timeout = 0;
683
684 strlcpy(sp->creator, retaddr, NG_NODESIZ);
685 }
686 switch (msg->header.cmd) {
687 case NGM_PPPOE_GET_STATUS:
688 {
689 struct ngpppoestat *stats;
690
691 NG_MKRESPONSE(resp, msg, sizeof(*stats), M_NOWAIT);
692 if (!resp) {
693 LEAVE(ENOMEM);
694 }
695 stats = (struct ngpppoestat *) resp->data;
696 stats->packets_in = privp->packets_in;
697 stats->packets_out = privp->packets_out;
698 break;
699 }
700 case NGM_PPPOE_CONNECT:
701 /*
702 * Check the hook exists and is Uninitialised.
703 * Send a PADI request, and start the timeout logic.
704 * Store the originator of this message so we can send
705 * a success of fail message to them later.
706 * Move the session to SINIT
707 * Set up the session to the correct state and
708 * start it.
709 */
710 neg->service.hdr.tag_type = PTT_SRV_NAME;
711 neg->service.hdr.tag_len =
712 htons((u_int16_t)ourmsg->data_len);
713 if (ourmsg->data_len) {
714 bcopy(ourmsg->data,
715 neg->service.data, ourmsg->data_len);
716 }
717 neg->service_len = ourmsg->data_len;
718 pppoe_start(sp);
719 break;
720 case NGM_PPPOE_LISTEN:
721 /*
722 * Check the hook exists and is Uninitialised.
723 * Install the service matching string.
724 * Store the originator of this message so we can send
725 * a success of fail message to them later.
726 * Move the hook to 'LISTENING'
727 */
728 neg->service.hdr.tag_type = PTT_SRV_NAME;
729 neg->service.hdr.tag_len =
730 htons((u_int16_t)ourmsg->data_len);
731
732 if (ourmsg->data_len) {
733 bcopy(ourmsg->data,
734 neg->service.data, ourmsg->data_len);
735 }
736 neg->service_len = ourmsg->data_len;
737 neg->pkt->pkt_header.ph.code = PADT_CODE;
738 /*
739 * wait for PADI packet coming from ethernet
740 */
741 sp->state = PPPOE_LISTENING;
742 break;
743 case NGM_PPPOE_OFFER:
744 /*
745 * Check the hook exists and is Uninitialised.
746 * Store the originator of this message so we can send
747 * a success of fail message to them later.
748 * Store the AC-Name given and go to PRIMED.
749 */
750 neg->ac_name.hdr.tag_type = PTT_AC_NAME;
751 neg->ac_name.hdr.tag_len =
752 htons((u_int16_t)ourmsg->data_len);
753 if (ourmsg->data_len) {
754 bcopy(ourmsg->data,
755 neg->ac_name.data, ourmsg->data_len);
756 }
757 neg->ac_name_len = ourmsg->data_len;
758 neg->pkt->pkt_header.ph.code = PADO_CODE;
759 /*
760 * Wait for PADI packet coming from hook
761 */
762 sp->state = PPPOE_PRIMED;
763 break;
764 case NGM_PPPOE_SERVICE:
765 /*
766 * Check the session is primed.
767 * for now just allow ONE service to be advertised.
768 * If you do it twice you just overwrite.
769 */
770 if (sp->state != PPPOE_PRIMED) {
771 kprintf("pppoe: Session not primed\n");
772 LEAVE(EISCONN);
773 }
774 neg = sp->neg;
775 neg->service.hdr.tag_type = PTT_SRV_NAME;
776 neg->service.hdr.tag_len =
777 htons((u_int16_t)ourmsg->data_len);
778
779 if (ourmsg->data_len)
780 bcopy(ourmsg->data, neg->service.data,
781 ourmsg->data_len);
782 neg->service_len = ourmsg->data_len;
783 break;
784 default:
785 LEAVE(EINVAL);
786 }
787 break;
788 default:
789 LEAVE(EINVAL);
790 }
791
792 /* Take care of synchronous response, if any */
793 if (rptr)
794 *rptr = resp;
795 else if (resp)
796 kfree(resp, M_NETGRAPH);
797
798 /* Free the message and return */
799 quit:
800 kfree(msg, M_NETGRAPH);
801 return(error);
802 }
803
804 /*
805 * Start a client into the first state. A separate function because
806 * it can be needed if the negotiation times out.
807 */
808 static void
809 pppoe_start(sessp sp)
810 {
811 struct {
812 struct pppoe_tag hdr;
813 union uniq data;
814 } __attribute ((packed)) uniqtag;
815
816 /*
817 * kick the state machine into starting up
818 */
819 AAA
820 sp->state = PPPOE_SINIT;
821 /* reset the packet header to broadcast */
822 sp->neg->pkt->pkt_header.eh = eh_prototype;
823 sp->neg->pkt->pkt_header.ph.code = PADI_CODE;
824 uniqtag.hdr.tag_type = PTT_HOST_UNIQ;
825 uniqtag.hdr.tag_len = htons((u_int16_t)sizeof(uniqtag.data));
826 uniqtag.data.pointer = sp;
827 init_tags(sp);
828 insert_tag(sp, &uniqtag.hdr);
829 insert_tag(sp, &sp->neg->service.hdr);
830 make_packet(sp);
831 sendpacket(sp);
832 }
833
834 static int
835 send_acname(sessp sp, const struct pppoe_tag *tag)
836 {
837 int error, tlen;
838 struct ng_mesg *msg;
839 struct ngpppoe_sts *sts;
840
841 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_ACNAME,
842 sizeof(struct ngpppoe_sts), M_NOWAIT);
843 if (msg == NULL)
844 return (ENOMEM);
845
846 sts = (struct ngpppoe_sts *)msg->data;
847 tlen = min(NG_HOOKSIZ - 1, ntohs(tag->tag_len));
848 strncpy(sts->hook, tag->tag_data, tlen);
849 sts->hook[tlen] = '\0';
850 error = ng_send_msg(sp->hook->node, msg, sp->creator, NULL);
851
852 return (error);
853 }
854
855 static int
856 send_sessionid(sessp sp)
857 {
858 int error;
859 struct ng_mesg *msg;
860
861 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_SESSIONID,
862 sizeof(u_int16_t), M_NOWAIT);
863 if (msg == NULL)
864 return (ENOMEM);
865
866 *(u_int16_t *)msg->data = sp->Session_ID;
867 error = ng_send_msg(sp->hook->node, msg, sp->creator, NULL);
868
869 return (error);
870 }
871
872 /*
873 * Receive data, and do something with it.
874 * The caller will never free m or meta, so
875 * if we use up this data or abort we must free BOTH of these.
876 */
877 static int
878 ng_pppoe_rcvdata(hook_p hook, struct mbuf *m, meta_p meta)
879 {
880 node_p node = hook->node;
881 const priv_p privp = node->private;
882 sessp sp = hook->private;
883 const struct pppoe_full_hdr *wh;
884 const struct pppoe_hdr *ph;
885 int error = 0;
886 u_int16_t length;
887 u_int8_t code;
888 const struct pppoe_tag *utag = NULL, *tag = NULL;
889 hook_p sendhook;
890 struct {
891 struct pppoe_tag hdr;
892 union uniq data;
893 } __attribute ((packed)) uniqtag;
894 negp neg = NULL;
895
896 AAA
897 if (hook->private == &privp->debug_hook) {
898 /*
899 * Data from the debug hook gets sent without modification
900 * straight to the ethernet.
901 */
902 NG_SEND_DATA( error, privp->ethernet_hook, m, meta);
903 privp->packets_out++;
904 } else if (hook->private == &privp->ethernet_hook) {
905 /*
906 * Incoming data.
907 * Dig out various fields from the packet.
908 * use them to decide where to send it.
909 */
910
911 privp->packets_in++;
912 if( m->m_len < sizeof(*wh)) {
913 m = m_pullup(m, sizeof(*wh)); /* Checks length */
914 if (m == NULL) {
915 kprintf("couldn't m_pullup\n");
916 LEAVE(ENOBUFS);
917 }
918 }
919 wh = mtod(m, struct pppoe_full_hdr *);
920 ph = &wh->ph;
921 length = ntohs(wh->ph.length);
922 code = wh->ph.code;
923 switch(wh->eh.ether_type) {
924 case ETHERTYPE_PPPOE_STUPID_DISC:
925 if (pppoe_mode == PPPOE_STANDARD) {
926 pppoe_mode = PPPOE_NONSTANDARD;
927 eh_prototype.ether_type =
928 ETHERTYPE_PPPOE_STUPID_DISC;
929 log(LOG_NOTICE,
930 "Switched to nonstandard PPPoE mode due to "
931 "packet from %*D\n",
932 ETHER_ADDR_LEN,
933 wh->eh.ether_shost, ":");
934 } else if (pppoe_mode == PPPOE_KEEPSTANDARD)
935 log(LOG_NOTICE,
936 "Ignored nonstandard PPPoE packet "
937 "from %*D\n",
938 ETHER_ADDR_LEN,
939 wh->eh.ether_shost, ":");
940 /* fall through */
941 case ETHERTYPE_PPPOE_DISC:
942 /*
943 * We need to try to make sure that the tag area
944 * is contiguous, or we could wander off the end
945 * of a buffer and make a mess.
946 * (Linux wouldn't have this problem).
947 */
948 /*XXX fix this mess */
949
950 if (m->m_pkthdr.len <= MHLEN) {
951 if( m->m_len < m->m_pkthdr.len) {
952 m = m_pullup(m, m->m_pkthdr.len);
953 if (m == NULL) {
954 kprintf("couldn't m_pullup\n");
955 LEAVE(ENOBUFS);
956 }
957 }
958 }
959 if (m->m_len != m->m_pkthdr.len) {
960 /*
961 * It's not all in one piece.
962 * We need to do extra work.
963 */
964 kprintf("packet fragmented\n");
965 LEAVE(EMSGSIZE);
966 }
967
968 switch(code) {
969 case PADI_CODE:
970 /*
971 * We are a server:
972 * Look for a hook with the required service
973 * and send the ENTIRE packet up there.
974 * It should come back to a new hook in
975 * PRIMED state. Look there for further
976 * processing.
977 */
978 tag = get_tag(ph, PTT_SRV_NAME);
979 if (tag == NULL) {
980 kprintf("no service tag\n");
981 LEAVE(ENETUNREACH);
982 }
983 sendhook = pppoe_match_svc(hook->node,
984 tag->tag_data, ntohs(tag->tag_len),
985 NG_MATCH_ANY);
986 if (sendhook) {
987 NG_SEND_DATA(error, sendhook, m, meta);
988 } else {
989 LEAVE(ENETUNREACH);
990 }
991 break;
992 case PADO_CODE:
993 /*
994 * We are a client:
995 * Use the host_uniq tag to find the
996 * hook this is in response to.
997 * Received #2, now send #3
998 * For now simply accept the first we receive.
999 */
1000 utag = get_tag(ph, PTT_HOST_UNIQ);
1001 if ((utag == NULL)
1002 || (ntohs(utag->tag_len) != sizeof(sp))) {
1003 kprintf("no host unique field\n");
1004 LEAVE(ENETUNREACH);
1005 }
1006
1007 sendhook = pppoe_finduniq(node, utag);
1008 if (sendhook == NULL) {
1009 kprintf("no matching session\n");
1010 LEAVE(ENETUNREACH);
1011 }
1012
1013 /*
1014 * Check the session is in the right state.
1015 * It needs to be in PPPOE_SINIT.
1016 */
1017 sp = sendhook->private;
1018 if (sp->state != PPPOE_SINIT) {
1019 kprintf("session in wrong state\n");
1020 LEAVE(ENETUNREACH);
1021 }
1022 neg = sp->neg;
1023 callout_stop(&neg->timeout_ch);
1024
1025 /*
1026 * This is the first time we hear
1027 * from the server, so note it's
1028 * unicast address, replacing the
1029 * broadcast address .
1030 */
1031 bcopy(wh->eh.ether_shost,
1032 neg->pkt->pkt_header.eh.ether_dhost,
1033 ETHER_ADDR_LEN);
1034 neg->timeout = 0;
1035 neg->pkt->pkt_header.ph.code = PADR_CODE;
1036 init_tags(sp);
1037 insert_tag(sp, utag); /* Host Unique */
1038 if ((tag = get_tag(ph, PTT_AC_COOKIE)))
1039 insert_tag(sp, tag); /* return cookie */
1040 if ((tag = get_tag(ph, PTT_AC_NAME))) {
1041 insert_tag(sp, tag); /* return it */
1042 send_acname(sp, tag);
1043 }
1044 insert_tag(sp, &neg->service.hdr); /* Service */
1045 scan_tags(sp, ph);
1046 make_packet(sp);
1047 sp->state = PPPOE_SREQ;
1048 sendpacket(sp);
1049 break;
1050 case PADR_CODE:
1051
1052 /*
1053 * We are a server:
1054 * Use the ac_cookie tag to find the
1055 * hook this is in response to.
1056 */
1057 utag = get_tag(ph, PTT_AC_COOKIE);
1058 if ((utag == NULL)
1059 || (ntohs(utag->tag_len) != sizeof(sp))) {
1060 LEAVE(ENETUNREACH);
1061 }
1062
1063 sendhook = pppoe_finduniq(node, utag);
1064 if (sendhook == NULL) {
1065 LEAVE(ENETUNREACH);
1066 }
1067
1068 /*
1069 * Check the session is in the right state.
1070 * It needs to be in PPPOE_SOFFER
1071 * or PPPOE_NEWCONNECTED. If the latter,
1072 * then this is a retry by the client.
1073 * so be nice, and resend.
1074 */
1075 sp = sendhook->private;
1076 if (sp->state == PPPOE_NEWCONNECTED) {
1077 /*
1078 * Whoa! drop back to resend that
1079 * PADS packet.
1080 * We should still have a copy of it.
1081 */
1082 sp->state = PPPOE_SOFFER;
1083 }
1084 if (sp->state != PPPOE_SOFFER) {
1085 LEAVE (ENETUNREACH);
1086 break;
1087 }
1088 neg = sp->neg;
1089 callout_stop(&neg->timeout_ch);
1090 neg->pkt->pkt_header.ph.code = PADS_CODE;
1091 if (sp->Session_ID == 0)
1092 neg->pkt->pkt_header.ph.sid =
1093 htons(sp->Session_ID
1094 = get_new_sid(node));
1095 send_sessionid(sp);
1096 neg->timeout = 0;
1097 /*
1098 * start working out the tags to respond with.
1099 */
1100 init_tags(sp);
1101 insert_tag(sp, &neg->ac_name.hdr); /* AC_NAME */
1102 if ((tag = get_tag(ph, PTT_SRV_NAME)))
1103 insert_tag(sp, tag);/* return service */
1104 if ((tag = get_tag(ph, PTT_HOST_UNIQ)))
1105 insert_tag(sp, tag); /* return it */
1106 insert_tag(sp, utag); /* ac_cookie */
1107 scan_tags(sp, ph);
1108 make_packet(sp);
1109 sp->state = PPPOE_NEWCONNECTED;
1110 sendpacket(sp);
1111 /*
1112 * Having sent the last Negotiation header,
1113 * Set up the stored packet header to
1114 * be correct for the actual session.
1115 * But keep the negotialtion stuff
1116 * around in case we need to resend this last
1117 * packet. We'll discard it when we move
1118 * from NEWCONNECTED to CONNECTED
1119 */
1120 sp->pkt_hdr = neg->pkt->pkt_header;
1121 if (pppoe_mode == PPPOE_NONSTANDARD)
1122 sp->pkt_hdr.eh.ether_type
1123 = ETHERTYPE_PPPOE_STUPID_SESS;
1124 else
1125 sp->pkt_hdr.eh.ether_type
1126 = ETHERTYPE_PPPOE_SESS;
1127 sp->pkt_hdr.ph.code = 0;
1128 pppoe_send_event(sp, NGM_PPPOE_SUCCESS);
1129 break;
1130 case PADS_CODE:
1131 /*
1132 * We are a client:
1133 * Use the host_uniq tag to find the
1134 * hook this is in response to.
1135 * take the session ID and store it away.
1136 * Also make sure the pre-made header is
1137 * correct and set us into Session mode.
1138 */
1139 utag = get_tag(ph, PTT_HOST_UNIQ);
1140 if ((utag == NULL)
1141 || (ntohs(utag->tag_len) != sizeof(sp))) {
1142 LEAVE (ENETUNREACH);
1143 break;
1144 }
1145 sendhook = pppoe_finduniq(node, utag);
1146 if (sendhook == NULL) {
1147 LEAVE(ENETUNREACH);
1148 }
1149
1150 /*
1151 * Check the session is in the right state.
1152 * It needs to be in PPPOE_SREQ.
1153 */
1154 sp = sendhook->private;
1155 if (sp->state != PPPOE_SREQ) {
1156 LEAVE(ENETUNREACH);
1157 }
1158 neg = sp->neg;
1159 callout_stop(&neg->timeout_ch);
1160 neg->pkt->pkt_header.ph.sid = wh->ph.sid;
1161 sp->Session_ID = ntohs(wh->ph.sid);
1162 send_sessionid(sp);
1163 neg->timeout = 0;
1164 sp->state = PPPOE_CONNECTED;
1165 /*
1166 * Now we have gone to Connected mode,
1167 * Free all resources needed for
1168 * negotiation.
1169 * Keep a copy of the header we will be using.
1170 */
1171 sp->pkt_hdr = neg->pkt->pkt_header;
1172 if (pppoe_mode == PPPOE_NONSTANDARD)
1173 sp->pkt_hdr.eh.ether_type
1174 = ETHERTYPE_PPPOE_STUPID_SESS;
1175 else
1176 sp->pkt_hdr.eh.ether_type
1177 = ETHERTYPE_PPPOE_SESS;
1178 sp->pkt_hdr.ph.code = 0;
1179 m_freem(neg->m);
1180 kfree(sp->neg, M_NETGRAPH);
1181 sp->neg = NULL;
1182 pppoe_send_event(sp, NGM_PPPOE_SUCCESS);
1183 break;
1184 case PADT_CODE:
1185 /*
1186 * Send a 'close' message to the controlling
1187 * process (the one that set us up);
1188 * And then tear everything down.
1189 *
1190 * Find matching peer/session combination.
1191 */
1192 sendhook = pppoe_findsession(node, wh);
1193 NG_FREE_DATA(m, meta); /* no longer needed */
1194 if (sendhook == NULL) {
1195 LEAVE(ENETUNREACH);
1196 }
1197 /* send message to creator */
1198 /* close hook */
1199 if (sendhook) {
1200 ng_destroy_hook(sendhook);
1201 }
1202 break;
1203 default:
1204 LEAVE(EPFNOSUPPORT);
1205 }
1206 break;
1207 case ETHERTYPE_PPPOE_STUPID_SESS:
1208 case ETHERTYPE_PPPOE_SESS:
1209 /*
1210 * find matching peer/session combination.
1211 */
1212 sendhook = pppoe_findsession(node, wh);
1213 if (sendhook == NULL) {
1214 LEAVE (ENETUNREACH);
1215 break;
1216 }
1217 sp = sendhook->private;
1218 m_adj(m, sizeof(*wh));
1219 if (m->m_pkthdr.len < length) {
1220 /* Packet too short, dump it */
1221 LEAVE(EMSGSIZE);
1222 }
1223
1224 /* Also need to trim excess at the end */
1225 if (m->m_pkthdr.len > length) {
1226 m_adj(m, -((int)(m->m_pkthdr.len - length)));
1227 }
1228 if ( sp->state != PPPOE_CONNECTED) {
1229 if (sp->state == PPPOE_NEWCONNECTED) {
1230 sp->state = PPPOE_CONNECTED;
1231 /*
1232 * Now we have gone to Connected mode,
1233 * Free all resources needed for
1234 * negotiation. Be paranoid about
1235 * whether there may be a timeout.
1236 */
1237 m_freem(sp->neg->m);
1238 callout_stop(&sp->neg->timeout_ch);
1239 kfree(sp->neg, M_NETGRAPH);
1240 sp->neg = NULL;
1241 } else {
1242 LEAVE (ENETUNREACH);
1243 break;
1244 }
1245 }
1246 NG_SEND_DATA( error, sendhook, m, meta);
1247 break;
1248 default:
1249 LEAVE(EPFNOSUPPORT);
1250 }
1251 } else {
1252 /*
1253 * Not ethernet or debug hook..
1254 *
1255 * The packet has come in on a normal hook.
1256 * We need to find out what kind of hook,
1257 * So we can decide how to handle it.
1258 * Check the hook's state.
1259 */
1260 sp = hook->private;
1261 switch (sp->state) {
1262 case PPPOE_NEWCONNECTED:
1263 case PPPOE_CONNECTED: {
1264 static const u_char addrctrl[] = { 0xff, 0x03 };
1265 struct pppoe_full_hdr *wh;
1266
1267 /*
1268 * Remove PPP address and control fields, if any.
1269 * For example, ng_ppp(4) always sends LCP packets
1270 * with address and control fields as required by
1271 * generic PPP. PPPoE is an exception to the rule.
1272 */
1273 if (m->m_pkthdr.len >= 2) {
1274 if (m->m_len < 2 && !(m = m_pullup(m, 2)))
1275 LEAVE(ENOBUFS);
1276 if (bcmp(mtod(m, u_char *), addrctrl, 2) == 0)
1277 m_adj(m, 2);
1278 }
1279 /*
1280 * Bang in a pre-made header, and set the length up
1281 * to be correct. Then send it to the ethernet driver.
1282 * But first correct the length.
1283 */
1284 sp->pkt_hdr.ph.length = htons((short)(m->m_pkthdr.len));
1285 M_PREPEND(m, sizeof(*wh), MB_DONTWAIT);
1286 if (m == NULL) {
1287 LEAVE(ENOBUFS);
1288 }
1289 wh = mtod(m, struct pppoe_full_hdr *);
1290 bcopy(&sp->pkt_hdr, wh, sizeof(*wh));
1291 NG_SEND_DATA( error, privp->ethernet_hook, m, meta);
1292 privp->packets_out++;
1293 break;
1294 }
1295 case PPPOE_PRIMED:
1296 /*
1297 * A PADI packet is being returned by the application
1298 * that has set up this hook. This indicates that it
1299 * wants us to offer service.
1300 */
1301 neg = sp->neg;
1302 if (m->m_len < sizeof(*wh)) {
1303 m = m_pullup(m, sizeof(*wh));
1304 if (m == NULL) {
1305 LEAVE(ENOBUFS);
1306 }
1307 }
1308 wh = mtod(m, struct pppoe_full_hdr *);
1309 ph = &wh->ph;
1310 length = ntohs(wh->ph.length);
1311 code = wh->ph.code;
1312 if ( code != PADI_CODE) {
1313 LEAVE(EINVAL);
1314 };
1315 callout_stop(&neg->timeout_ch);
1316
1317 /*
1318 * This is the first time we hear
1319 * from the client, so note it's
1320 * unicast address, replacing the
1321 * broadcast address.
1322 */
1323 bcopy(wh->eh.ether_shost,
1324 neg->pkt->pkt_header.eh.ether_dhost,
1325 ETHER_ADDR_LEN);
1326 sp->state = PPPOE_SOFFER;
1327 neg->timeout = 0;
1328 neg->pkt->pkt_header.ph.code = PADO_CODE;
1329
1330 /*
1331 * start working out the tags to respond with.
1332 */
1333 uniqtag.hdr.tag_type = PTT_AC_COOKIE;
1334 uniqtag.hdr.tag_len = htons((u_int16_t)sizeof(sp));
1335 uniqtag.data.pointer = sp;
1336 init_tags(sp);
1337 insert_tag(sp, &neg->ac_name.hdr); /* AC_NAME */
1338 if ((tag = get_tag(ph, PTT_SRV_NAME)))
1339 insert_tag(sp, tag); /* return service */
1340 /*
1341 * If we have a NULL service request
1342 * and have an extra service defined in this hook,
1343 * then also add a tag for the extra service.
1344 * XXX this is a hack. eventually we should be able
1345 * to support advertising many services, not just one
1346 */
1347 if (((tag == NULL) || (tag->tag_len == 0))
1348 && (neg->service.hdr.tag_len != 0)) {
1349 insert_tag(sp, &neg->service.hdr); /* SERVICE */
1350 }
1351 if ((tag = get_tag(ph, PTT_HOST_UNIQ)))
1352 insert_tag(sp, tag); /* returned hostunique */
1353 insert_tag(sp, &uniqtag.hdr);
1354 scan_tags(sp, ph);
1355 make_packet(sp);
1356 sendpacket(sp);
1357 break;
1358
1359 /*
1360 * Packets coming from the hook make no sense
1361 * to sessions in these states. Throw them away.
1362 */
1363 case PPPOE_SINIT:
1364 case PPPOE_SREQ:
1365 case PPPOE_SOFFER:
1366 case PPPOE_SNONE:
1367 case PPPOE_LISTENING:
1368 case PPPOE_DEAD:
1369 default:
1370 LEAVE(ENETUNREACH);
1371 }
1372 }
1373 quit:
1374 NG_FREE_DATA(m, meta);
1375 return error;
1376 }
1377
1378 /*
1379 * Do local shutdown processing..
1380 * If we are a persistant device, we might refuse to go away, and
1381 * we'd only remove our links and reset ourself.
1382 */
1383 static int
1384 ng_pppoe_rmnode(node_p node)
1385 {
1386 const priv_p privdata = node->private;
1387
1388 AAA
1389 node->flags |= NG_INVALID;
1390 ng_cutlinks(node);
1391 ng_unname(node);
1392 node->private = NULL;
1393 ng_unref(privdata->node);
1394 kfree(privdata, M_NETGRAPH);
1395 return (0);
1396 }
1397
1398 /*
1399 * This is called once we've already connected a new hook to the other node.
1400 * It gives us a chance to balk at the last minute.
1401 */
1402 static int
1403 ng_pppoe_connect(hook_p hook)
1404 {
1405 /* be really amiable and just say "YUP that's OK by me! " */
1406 return (0);
1407 }
1408
1409 /*
1410 * Hook disconnection
1411 *
1412 * Clean up all dangling links and information about the session/hook.
1413 * For this type, removal of the last link destroys the node
1414 */
1415 static int
1416 ng_pppoe_disconnect(hook_p hook)
1417 {
1418 node_p node = hook->node;
1419 priv_p privp = node->private;
1420 sessp sp;
1421 int hooks;
1422
1423 AAA
1424 hooks = node->numhooks; /* this one already not counted */
1425 if (hook->private == &privp->debug_hook) {
1426 privp->debug_hook = NULL;
1427 } else if (hook->private == &privp->ethernet_hook) {
1428 privp->ethernet_hook = NULL;
1429 ng_rmnode(node);
1430 } else {
1431 sp = hook->private;
1432 if (sp->state != PPPOE_SNONE ) {
1433 pppoe_send_event(sp, NGM_PPPOE_CLOSE);
1434 }
1435 /*
1436 * According to the spec, if we are connected,
1437 * we should send a DISC packet if we are shutting down
1438 * a session.
1439 */
1440 if ((privp->ethernet_hook)
1441 && ((sp->state == PPPOE_CONNECTED)
1442 || (sp->state == PPPOE_NEWCONNECTED))) {
1443 struct mbuf *m;
1444 struct pppoe_full_hdr *wh;
1445 struct pppoe_tag *tag;
1446 int msglen = strlen(SIGNOFF);
1447 void *dummy = NULL;
1448 int error = 0;
1449
1450 /* revert the stored header to DISC/PADT mode */
1451 wh = &sp->pkt_hdr;
1452 wh->ph.code = PADT_CODE;
1453 if (pppoe_mode == PPPOE_NONSTANDARD)
1454 wh->eh.ether_type = ETHERTYPE_PPPOE_STUPID_DISC;
1455 else
1456 wh->eh.ether_type = ETHERTYPE_PPPOE_DISC;
1457
1458 /* generate a packet of that type */
1459 MGETHDR(m, MB_DONTWAIT, MT_DATA);
1460 if(m == NULL)
1461 kprintf("pppoe: Session out of mbufs\n");
1462 else {
1463 m->m_pkthdr.rcvif = NULL;
1464 m->m_pkthdr.len = m->m_len = sizeof(*wh);
1465 bcopy((caddr_t)wh, mtod(m, caddr_t),
1466 sizeof(*wh));
1467 /*
1468 * Add a General error message and adjust
1469 * sizes
1470 */
1471 wh = mtod(m, struct pppoe_full_hdr *);
1472 tag = wh->ph.tag;
1473 tag->tag_type = PTT_GEN_ERR;
1474 tag->tag_len = htons((u_int16_t)msglen);
1475 strncpy(tag->tag_data, SIGNOFF, msglen);
1476 m->m_pkthdr.len = (m->m_len += sizeof(*tag) +
1477 msglen);
1478 wh->ph.length = htons(sizeof(*tag) + msglen);
1479 NG_SEND_DATA(error, privp->ethernet_hook, m,
1480 dummy);
1481 }
1482 }
1483 /*
1484 * As long as we have somewhere to store the timeout handle,
1485 * we may have a timeout pending.. get rid of it.
1486 */
1487 if (sp->neg) {
1488 callout_stop(&sp->neg->timeout_ch);
1489 if (sp->neg->m)
1490 m_freem(sp->neg->m);
1491 kfree(sp->neg, M_NETGRAPH);
1492 }
1493 kfree(sp, M_NETGRAPH);
1494 hook->private = NULL;
1495 /* work out how many session hooks there are */
1496 /* Node goes away on last session hook removal */
1497 if (privp->ethernet_hook) hooks -= 1;
1498 if (privp->debug_hook) hooks -= 1;
1499 }
1500 if (node->numhooks == 0)
1501 ng_rmnode(node);
1502 return (0);
1503 }
1504
1505 /*
1506 * timeouts come here.
1507 */
1508 static void
1509 pppoe_ticker(void *arg)
1510 {
1511 hook_p hook = arg;
1512 sessp sp = hook->private;
1513 negp neg = sp->neg;
1514 int error = 0;
1515 struct mbuf *m0 = NULL;
1516 priv_p privp = hook->node->private;
1517 meta_p dummy = NULL;
1518
1519 crit_enter();
1520 AAA
1521 switch(sp->state) {
1522 /*
1523 * resend the last packet, using an exponential backoff.
1524 * After a period of time, stop growing the backoff,
1525 * and either leave it, or revert to the start.
1526 */
1527 case PPPOE_SINIT:
1528 case PPPOE_SREQ:
1529 /* timeouts on these produce resends */
1530 m0 = m_copypacket(sp->neg->m, MB_DONTWAIT);
1531 NG_SEND_DATA( error, privp->ethernet_hook, m0, dummy);
1532 callout_reset(&neg->timeout_ch, neg->timeout * hz,
1533 pppoe_ticker, hook);
1534 if ((neg->timeout <<= 1) > PPPOE_TIMEOUT_LIMIT) {
1535 if (sp->state == PPPOE_SREQ) {
1536 /* revert to SINIT mode */
1537 pppoe_start(sp);
1538 } else {
1539 neg->timeout = PPPOE_TIMEOUT_LIMIT;
1540 }
1541 }
1542 break;
1543 case PPPOE_PRIMED:
1544 case PPPOE_SOFFER:
1545 /* a timeout on these says "give up" */
1546 ng_destroy_hook(hook);
1547 break;
1548 default:
1549 /* timeouts have no meaning in other states */
1550 kprintf("pppoe: unexpected timeout\n");
1551 }
1552 crit_exit();
1553 }
1554
1555
1556 static void
1557 sendpacket(sessp sp)
1558 {
1559 int error = 0;
1560 struct mbuf *m0 = NULL;
1561 hook_p hook = sp->hook;
1562 negp neg = sp->neg;
1563 priv_p privp = hook->node->private;
1564 meta_p dummy = NULL;
1565
1566 AAA
1567 switch(sp->state) {
1568 case PPPOE_LISTENING:
1569 case PPPOE_DEAD:
1570 case PPPOE_SNONE:
1571 case PPPOE_CONNECTED:
1572 kprintf("pppoe: sendpacket: unexpected state\n");
1573 break;
1574
1575 case PPPOE_NEWCONNECTED:
1576 /* send the PADS without a timeout - we're now connected */
1577 m0 = m_copypacket(sp->neg->m, MB_DONTWAIT);
1578 NG_SEND_DATA( error, privp->ethernet_hook, m0, dummy);
1579 break;
1580
1581 case PPPOE_PRIMED:
1582 /* No packet to send, but set up the timeout */
1583 callout_reset(&neg->timeout_ch, PPPOE_OFFER_TIMEOUT * hz,
1584 pppoe_ticker, hook);
1585 break;
1586
1587 case PPPOE_SOFFER:
1588 /*
1589 * send the offer but if they don't respond
1590 * in PPPOE_OFFER_TIMEOUT seconds, forget about it.
1591 */
1592 m0 = m_copypacket(sp->neg->m, MB_DONTWAIT);
1593 NG_SEND_DATA( error, privp->ethernet_hook, m0, dummy);
1594 callout_reset(&neg->timeout_ch, PPPOE_OFFER_TIMEOUT * hz,
1595 pppoe_ticker, hook);
1596 break;
1597
1598 case PPPOE_SINIT:
1599 case PPPOE_SREQ:
1600 m0 = m_copypacket(sp->neg->m, MB_DONTWAIT);
1601 NG_SEND_DATA( error, privp->ethernet_hook, m0, dummy);
1602 callout_reset(&neg->timeout_ch, PPPOE_INITIAL_TIMEOUT * hz,
1603 pppoe_ticker, hook);
1604 neg->timeout = PPPOE_INITIAL_TIMEOUT * 2;
1605 break;
1606
1607 default:
1608 error = EINVAL;
1609 kprintf("pppoe: timeout: bad state\n");
1610 }
1611 /* return (error); */
1612 }
1613
1614 /*
1615 * Parse an incoming packet to see if any tags should be copied to the
1616 * output packet. Don't do any tags that have been handled in the main
1617 * state machine.
1618 */
1619 static const struct pppoe_tag*
1620 scan_tags(sessp sp, const struct pppoe_hdr* ph)
1621 {
1622 const char *const end = (const char *)next_tag(ph);
1623 const char *ptn;
1624 const struct pppoe_tag *pt = &ph->tag[0];
1625 /*
1626 * Keep processing tags while a tag header will still fit.
1627 */
1628 AAA
1629 while((const char*)(pt + 1) <= end) {
1630 /*
1631 * If the tag data would go past the end of the packet, abort.
1632 */
1633 ptn = (((const char *)(pt + 1)) + ntohs(pt->tag_len));
1634 if(ptn > end)
1635 return NULL;
1636
1637 switch (pt->tag_type) {
1638 case PTT_RELAY_SID:
1639 insert_tag(sp, pt);
1640 break;
1641 case PTT_EOL:
1642 return NULL;
1643 case PTT_SRV_NAME:
1644 case PTT_AC_NAME:
1645 case PTT_HOST_UNIQ:
1646 case PTT_AC_COOKIE:
1647 case PTT_VENDOR:
1648 case PTT_SRV_ERR:
1649 case PTT_SYS_ERR:
1650 case PTT_GEN_ERR:
1651 break;
1652 }
1653 pt = (const struct pppoe_tag*)ptn;
1654 }
1655 return NULL;
1656 }
1657
1658 static int
1659 pppoe_send_event(sessp sp, enum cmd cmdid)
1660 {
1661 int error;
1662 struct ng_mesg *msg;
1663 struct ngpppoe_sts *sts;
1664
1665 AAA
1666 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, cmdid,
1667 sizeof(struct ngpppoe_sts), M_NOWAIT);
1668 if (msg == NULL)
1669 return (ENOMEM);
1670 sts = (struct ngpppoe_sts *)msg->data;
1671 strlcpy(sts->hook, sp->hook->name, NG_HOOKSIZ);
1672 error = ng_send_msg(sp->hook->node, msg, sp->creator, NULL);
1673 return (error);
1674 }
DragonFly BSD