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37 * Author: Julian Elischer <julian@freebsd.org>
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 $
43 #define AAA kprintf("pppoe: %s\n", __func__ );
44 #define BBB kprintf("-%d-", __LINE__ );
50 #include <sys/param.h>
51 #include <sys/systm.h>
52 #include <sys/kernel.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>
61 #include <netgraph/ng_message.h>
62 #include <netgraph/netgraph.h>
65 #define SIGNOFF "session closed"
68 * This section contains the netgraph method declarations for the
69 * pppoe node. These methods define the netgraph pppoe 'type'.
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;
80 /* Netgraph node type descriptor */
81 static struct ng_type typestruct = {
96 NETGRAPH_INIT(pppoe, &typestruct);
99 * States for the session state machine.
100 * These have no meaning if there is no hook attached yet.
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] */
114 #define NUMTAGS 20 /* number of tags we are set up to work with */
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.
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 */
128 const struct pppoe_tag *tags[NUMTAGS];
132 struct datatag service;
133 struct datatag ac_name;
135 typedef struct sess_neg *negp;
138 * Session information that is needed after connection.
142 u_int16_t Session_ID;
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 */
149 typedef struct sess_con *sessp;
152 * Information we store for each node
155 node_p node; /* back pointer to node */
156 hook_p ethernet_hook;
158 u_int packets_in; /* packets in from ethernet */
159 u_int packets_out; /* packets out towards ethernet */
161 /*struct sess_con *buckets[HASH_SIZE];*/ /* not yet used */
163 typedef struct PPPOE *priv_p;
165 struct ether_header eh_prototype =
166 {{0xff,0xff,0xff,0xff,0xff,0xff},
167 {0x00,0x00,0x00,0x00,0x00,0x00},
168 ETHERTYPE_PPPOE_DISC};
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;
176 ngpppoe_set_ethertype(SYSCTL_HANDLER_ARGS)
182 error = sysctl_handle_int(oidp, &val, sizeof(int), req);
183 if (error != 0 || req->newptr == NULL)
186 case PPPOE_NONSTANDARD:
187 pppoe_mode = PPPOE_NONSTANDARD;
188 eh_prototype.ether_type = ETHERTYPE_PPPOE_STUPID_DISC;
191 pppoe_mode = PPPOE_STANDARD;
192 eh_prototype.ether_type = ETHERTYPE_PPPOE_DISC;
194 case PPPOE_KEEPSTANDARD:
195 pppoe_mode = PPPOE_KEEPSTANDARD;
196 eh_prototype.ether_type = ETHERTYPE_PPPOE_DISC;
204 SYSCTL_PROC(_net_graph, OID_AUTO, nonstandard_pppoe, CTLTYPE_INT | CTLFLAG_RW,
205 0, sizeof(int), ngpppoe_set_ethertype, "I", "nonstandard ethertype");
208 char bytes[sizeof(void *)];
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);
220 /*************************************************************************
221 * Some basic utilities from the Linux version with author's permission.*
222 * Author: Michal Ostrowski <mostrows@styx.uwaterloo.ca> *
223 ************************************************************************/
226 * Generate a new session id
227 * XXX find out the FreeBSD locking scheme.
230 get_new_sid(node_p node)
232 static int pppoe_sid = 10;
236 priv_p privp = node->private;
242 * Spec says 0xFFFF is reserved.
243 * Also don't use 0x0000
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))
257 if (sp->Session_ID == val)
266 * Return the location where the next tag can be put
268 static __inline const struct pppoe_tag*
269 next_tag(const struct pppoe_hdr* ph)
271 return (const struct pppoe_tag*)(((const char*)&ph->tag[0])
272 + ntohs(ph->length));
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.
280 static const struct pppoe_tag*
281 get_tag(const struct pppoe_hdr* ph, u_int16_t idx)
283 const char *const end = (const char *)next_tag(ph);
285 const struct pppoe_tag *pt = &ph->tag[0];
287 * Keep processing tags while a tag header will still fit.
290 while((const char*)(pt + 1) <= end) {
292 * If the tag data would go past the end of the packet, abort.
294 ptn = (((const char *)(pt + 1)) + ntohs(pt->tag_len));
298 if(pt->tag_type == idx)
301 pt = (const struct pppoe_tag*)ptn;
306 /**************************************************************************
307 * inlines to initialise or add tags to a session's tag list,
308 **************************************************************************/
310 * Initialise the session's tag list
316 if(sp->neg == NULL) {
317 kprintf("pppoe: asked to init NULL neg pointer\n");
320 sp->neg->numtags = 0;
324 insert_tag(sessp sp, const struct pppoe_tag *tp)
330 if((neg = sp->neg) == NULL) {
331 kprintf("pppoe: asked to use NULL neg pointer\n");
334 if ((i = neg->numtags++) < NUMTAGS) {
337 kprintf("pppoe: asked to add too many tags to packet\n");
343 * Make up a packet, using the tags filled out for the session.
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.
351 make_packet(sessp sp) {
352 struct pppoe_full_hdr *wh = &sp->neg->pkt->pkt_header;
353 const struct pppoe_tag **tag;
357 u_int16_t length = 0;
360 if ((sp->neg == NULL) || (sp->neg->m == NULL)) {
361 kprintf("pppoe: make_packet called from wrong state\n");
363 dp = (char *)wh->ph.tag;
364 for (count = 0, tag = sp->neg->tags;
365 ((count < sp->neg->numtags) && (count < NUMTAGS));
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 */
373 bcopy(*tag, (char *)dp, tlen);
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);
382 /**************************************************************************
383 * Routine to match a service offered *
384 **************************************************************************/
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.
393 #define NG_MATCH_EXACT 1
394 #define NG_MATCH_ANY 2
397 pppoe_match_svc(node_p node, const char *svc_name, int svc_len, int match)
401 priv_p privp = node->private;
402 hook_p allhook = NULL;
406 LIST_FOREACH(hook, &node->hooks, hooks) {
408 /* skip any hook that is debug or ethernet */
409 if ((hook->private == &privp->debug_hook)
410 || (hook->private == &privp->ethernet_hook))
414 /* Skip any sessions which are not in LISTEN mode. */
415 if ( sp->state != PPPOE_LISTENING)
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] == '*') {
427 /* If the lengths don't match, that aint it. */
428 if (neg->service_len != svc_len)
431 /* An exact match? */
435 if (strncmp(svc_name, neg->service.data, svc_len) == 0)
438 return (hook ? hook : allhook);
440 /**************************************************************************
441 * Routine to find a particular session that matches an incoming packet *
442 **************************************************************************/
444 pppoe_findsession(node_p node, const struct pppoe_full_hdr *wh)
448 priv_p privp = node->private;
449 u_int16_t session = ntohs(wh->ph.sid);
452 * find matching peer/session combination.
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)) {
462 if ( ( (sp->state == PPPOE_CONNECTED)
463 || (sp->state == PPPOE_NEWCONNECTED) )
464 && (sp->Session_ID == session)
465 && (bcmp(sp->pkt_hdr.eh.ether_dhost,
467 ETHER_ADDR_LEN)) == 0) {
475 pppoe_finduniq(node_p node, const struct pppoe_tag *tag)
478 priv_p privp = node->private;
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))
489 if (uniq.pointer == hook->private)
495 /**************************************************************************
496 * start of Netgraph entrypoints *
497 **************************************************************************/
500 * Allocate the private data structure and the generic node
501 * and link them together.
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.
509 ng_pppoe_constructor(node_p *nodep)
515 /* Initialize private descriptor */
516 privdata = kmalloc(sizeof(*privdata), M_NETGRAPH, M_NOWAIT | M_ZERO);
517 if (privdata == NULL)
520 /* Call the 'generic' (ie, superclass) node constructor */
521 if ((error = ng_make_node_common(&typestruct, nodep))) {
522 kfree(privdata, M_NETGRAPH);
526 /* Link structs together; this counts as our one reference to *nodep */
527 (*nodep)->private = privdata;
528 privdata->node = *nodep;
533 * Give our ok for a hook to be added...
534 * point the hook's private info to the hook structure.
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).
542 ng_pppoe_newhook(node_p node, hook_p hook, const char *name)
544 const priv_p privp = node->private;
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;
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.
560 sp = kmalloc(sizeof(*sp), M_NETGRAPH, M_NOWAIT | M_ZERO);
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.
577 ng_pppoe_rcvmsg(node_p node,
578 struct ng_mesg *msg, const char *retaddr, struct ng_mesg **rptr)
580 priv_p privp = node->private;
581 struct ngpppoe_init_data *ourmsg = NULL;
582 struct ng_mesg *resp = NULL;
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");
604 if (ourmsg->data_len > PPPOE_SERVICE_NAME_SIZE) {
605 kprintf("pppoe: init data too long (%d)\n",
609 /* make sure strcmp will terminate safely */
610 ourmsg->hook[sizeof(ourmsg->hook) - 1] = '\0';
612 /* cycle through all known hooks */
613 LIST_FOREACH(hook, &node->hooks, hooks) {
615 && strcmp(hook->name, ourmsg->hook) == 0)
621 if ((hook->private == &privp->debug_hook)
622 || (hook->private == &privp->ethernet_hook)) {
627 if (msg->header.cmd == NGM_PPPOE_LISTEN) {
629 * Ensure we aren't already listening for this
632 if (pppoe_match_svc(node, ourmsg->data,
633 ourmsg->data_len, NG_MATCH_EXACT) != NULL) {
639 * PPPOE_SERVICE advertisments are set up
640 * on sessions that are in PRIMED state.
642 if (msg->header.cmd == NGM_PPPOE_SERVICE) {
645 if (sp->state != PPPOE_SNONE) {
646 kprintf("pppoe: Session already active\n");
651 * set up prototype header
653 neg = kmalloc(sizeof(*neg), M_NETGRAPH,
657 kprintf("pppoe: Session out of memory\n");
660 MGETHDR(neg->m, MB_DONTWAIT, MT_DATA);
662 kprintf("pppoe: Session out of mbufs\n");
663 kfree(neg, M_NETGRAPH);
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");
671 kfree(neg, M_NETGRAPH);
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;
684 strlcpy(sp->creator, retaddr, NG_NODESIZ);
686 switch (msg->header.cmd) {
687 case NGM_PPPOE_GET_STATUS:
689 struct ngpppoestat *stats;
691 NG_MKRESPONSE(resp, msg, sizeof(*stats), M_NOWAIT);
695 stats = (struct ngpppoestat *) resp->data;
696 stats->packets_in = privp->packets_in;
697 stats->packets_out = privp->packets_out;
700 case NGM_PPPOE_CONNECT:
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
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) {
715 neg->service.data, ourmsg->data_len);
717 neg->service_len = ourmsg->data_len;
720 case NGM_PPPOE_LISTEN:
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'
728 neg->service.hdr.tag_type = PTT_SRV_NAME;
729 neg->service.hdr.tag_len =
730 htons((u_int16_t)ourmsg->data_len);
732 if (ourmsg->data_len) {
734 neg->service.data, ourmsg->data_len);
736 neg->service_len = ourmsg->data_len;
737 neg->pkt->pkt_header.ph.code = PADT_CODE;
739 * wait for PADI packet coming from ethernet
741 sp->state = PPPOE_LISTENING;
743 case NGM_PPPOE_OFFER:
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.
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) {
755 neg->ac_name.data, ourmsg->data_len);
757 neg->ac_name_len = ourmsg->data_len;
758 neg->pkt->pkt_header.ph.code = PADO_CODE;
760 * Wait for PADI packet coming from hook
762 sp->state = PPPOE_PRIMED;
764 case NGM_PPPOE_SERVICE:
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.
770 if (sp->state != PPPOE_PRIMED) {
771 kprintf("pppoe: Session not primed\n");
775 neg->service.hdr.tag_type = PTT_SRV_NAME;
776 neg->service.hdr.tag_len =
777 htons((u_int16_t)ourmsg->data_len);
779 if (ourmsg->data_len)
780 bcopy(ourmsg->data, neg->service.data,
782 neg->service_len = ourmsg->data_len;
792 /* Take care of synchronous response, if any */
796 kfree(resp, M_NETGRAPH);
798 /* Free the message and return */
800 kfree(msg, M_NETGRAPH);
805 * Start a client into the first state. A separate function because
806 * it can be needed if the negotiation times out.
809 pppoe_start(sessp sp)
812 struct pppoe_tag hdr;
814 } __attribute ((packed)) uniqtag;
817 * kick the state machine into starting up
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;
828 insert_tag(sp, &uniqtag.hdr);
829 insert_tag(sp, &sp->neg->service.hdr);
835 send_acname(sessp sp, const struct pppoe_tag *tag)
839 struct ngpppoe_sts *sts;
841 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_ACNAME,
842 sizeof(struct ngpppoe_sts), M_NOWAIT);
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);
856 send_sessionid(sessp sp)
861 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_SESSIONID,
862 sizeof(u_int16_t), M_NOWAIT);
866 *(u_int16_t *)msg->data = sp->Session_ID;
867 error = ng_send_msg(sp->hook->node, msg, sp->creator, NULL);
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.
878 ng_pppoe_rcvdata(hook_p hook, struct mbuf *m, meta_p meta)
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;
889 const struct pppoe_tag *utag = NULL, *tag = NULL;
892 struct pppoe_tag hdr;
894 } __attribute ((packed)) uniqtag;
898 if (hook->private == &privp->debug_hook) {
900 * Data from the debug hook gets sent without modification
901 * straight to the ethernet.
903 NG_SEND_DATA( error, privp->ethernet_hook, m, meta);
904 privp->packets_out++;
905 } else if (hook->private == &privp->ethernet_hook) {
908 * Dig out various fields from the packet.
909 * use them to decide where to send it.
913 if( m->m_len < sizeof(*wh)) {
914 m = m_pullup(m, sizeof(*wh)); /* Checks length */
916 kprintf("couldn't m_pullup\n");
920 wh = mtod(m, struct pppoe_full_hdr *);
922 session = ntohs(wh->ph.sid);
923 length = ntohs(wh->ph.length);
925 switch(wh->eh.ether_type) {
926 case ETHERTYPE_PPPOE_STUPID_DISC:
927 if (pppoe_mode == PPPOE_STANDARD) {
928 pppoe_mode = PPPOE_NONSTANDARD;
929 eh_prototype.ether_type =
930 ETHERTYPE_PPPOE_STUPID_DISC;
932 "Switched to nonstandard PPPoE mode due to "
935 wh->eh.ether_shost, ":");
936 } else if (pppoe_mode == PPPOE_KEEPSTANDARD)
938 "Ignored nonstandard PPPoE packet "
941 wh->eh.ether_shost, ":");
943 case ETHERTYPE_PPPOE_DISC:
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).
950 /*XXX fix this mess */
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);
956 kprintf("couldn't m_pullup\n");
961 if (m->m_len != m->m_pkthdr.len) {
963 * It's not all in one piece.
964 * We need to do extra work.
966 kprintf("packet fragmented\n");
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
980 tag = get_tag(ph, PTT_SRV_NAME);
982 kprintf("no service tag\n");
985 sendhook = pppoe_match_svc(hook->node,
986 tag->tag_data, ntohs(tag->tag_len),
989 NG_SEND_DATA(error, sendhook, m, meta);
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.
1002 utag = get_tag(ph, PTT_HOST_UNIQ);
1004 || (ntohs(utag->tag_len) != sizeof(sp))) {
1005 kprintf("no host unique field\n");
1009 sendhook = pppoe_finduniq(node, utag);
1010 if (sendhook == NULL) {
1011 kprintf("no matching session\n");
1016 * Check the session is in the right state.
1017 * It needs to be in PPPOE_SINIT.
1019 sp = sendhook->private;
1020 if (sp->state != PPPOE_SINIT) {
1021 kprintf("session in wrong state\n");
1025 callout_stop(&neg->timeout_ch);
1028 * This is the first time we hear
1029 * from the server, so note it's
1030 * unicast address, replacing the
1031 * broadcast address .
1033 bcopy(wh->eh.ether_shost,
1034 neg->pkt->pkt_header.eh.ether_dhost,
1037 neg->pkt->pkt_header.ph.code = PADR_CODE;
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);
1046 insert_tag(sp, &neg->service.hdr); /* Service */
1049 sp->state = PPPOE_SREQ;
1056 * Use the ac_cookie tag to find the
1057 * hook this is in response to.
1059 utag = get_tag(ph, PTT_AC_COOKIE);
1061 || (ntohs(utag->tag_len) != sizeof(sp))) {
1065 sendhook = pppoe_finduniq(node, utag);
1066 if (sendhook == NULL) {
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.
1077 sp = sendhook->private;
1078 if (sp->state == PPPOE_NEWCONNECTED) {
1080 * Whoa! drop back to resend that
1082 * We should still have a copy of it.
1084 sp->state = PPPOE_SOFFER;
1086 if (sp->state != PPPOE_SOFFER) {
1087 LEAVE (ENETUNREACH);
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));
1100 * start working out the tags to respond with.
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 */
1111 sp->state = PPPOE_NEWCONNECTED;
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
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;
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);
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.
1141 utag = get_tag(ph, PTT_HOST_UNIQ);
1143 || (ntohs(utag->tag_len) != sizeof(sp))) {
1144 LEAVE (ENETUNREACH);
1147 sendhook = pppoe_finduniq(node, utag);
1148 if (sendhook == NULL) {
1153 * Check the session is in the right state.
1154 * It needs to be in PPPOE_SREQ.
1156 sp = sendhook->private;
1157 if (sp->state != PPPOE_SREQ) {
1161 callout_stop(&neg->timeout_ch);
1162 neg->pkt->pkt_header.ph.sid = wh->ph.sid;
1163 sp->Session_ID = ntohs(wh->ph.sid);
1166 sp->state = PPPOE_CONNECTED;
1168 * Now we have gone to Connected mode,
1169 * Free all resources needed for
1171 * Keep a copy of the header we will be using.
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;
1178 sp->pkt_hdr.eh.ether_type
1179 = ETHERTYPE_PPPOE_SESS;
1180 sp->pkt_hdr.ph.code = 0;
1182 kfree(sp->neg, M_NETGRAPH);
1184 pppoe_send_event(sp, NGM_PPPOE_SUCCESS);
1188 * Send a 'close' message to the controlling
1189 * process (the one that set us up);
1190 * And then tear everything down.
1192 * Find matching peer/session combination.
1194 sendhook = pppoe_findsession(node, wh);
1195 NG_FREE_DATA(m, meta); /* no longer needed */
1196 if (sendhook == NULL) {
1199 /* send message to creator */
1202 ng_destroy_hook(sendhook);
1206 LEAVE(EPFNOSUPPORT);
1209 case ETHERTYPE_PPPOE_STUPID_SESS:
1210 case ETHERTYPE_PPPOE_SESS:
1212 * find matching peer/session combination.
1214 sendhook = pppoe_findsession(node, wh);
1215 if (sendhook == NULL) {
1216 LEAVE (ENETUNREACH);
1219 sp = sendhook->private;
1220 m_adj(m, sizeof(*wh));
1221 if (m->m_pkthdr.len < length) {
1222 /* Packet too short, dump it */
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)));
1230 if ( sp->state != PPPOE_CONNECTED) {
1231 if (sp->state == PPPOE_NEWCONNECTED) {
1232 sp->state = PPPOE_CONNECTED;
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.
1239 m_freem(sp->neg->m);
1240 callout_stop(&sp->neg->timeout_ch);
1241 kfree(sp->neg, M_NETGRAPH);
1244 LEAVE (ENETUNREACH);
1248 NG_SEND_DATA( error, sendhook, m, meta);
1251 LEAVE(EPFNOSUPPORT);
1255 * Not ethernet or debug hook..
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.
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;
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.
1275 if (m->m_pkthdr.len >= 2) {
1276 if (m->m_len < 2 && !(m = m_pullup(m, 2)))
1278 if (bcmp(mtod(m, u_char *), addrctrl, 2) == 0)
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.
1286 sp->pkt_hdr.ph.length = htons((short)(m->m_pkthdr.len));
1287 M_PREPEND(m, sizeof(*wh), MB_DONTWAIT);
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++;
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.
1304 if (m->m_len < sizeof(*wh)) {
1305 m = m_pullup(m, sizeof(*wh));
1310 wh = mtod(m, struct pppoe_full_hdr *);
1312 session = ntohs(wh->ph.sid);
1313 length = ntohs(wh->ph.length);
1315 if ( code != PADI_CODE) {
1318 callout_stop(&neg->timeout_ch);
1321 * This is the first time we hear
1322 * from the client, so note it's
1323 * unicast address, replacing the
1324 * broadcast address.
1326 bcopy(wh->eh.ether_shost,
1327 neg->pkt->pkt_header.eh.ether_dhost,
1329 sp->state = PPPOE_SOFFER;
1331 neg->pkt->pkt_header.ph.code = PADO_CODE;
1334 * start working out the tags to respond with.
1336 uniqtag.hdr.tag_type = PTT_AC_COOKIE;
1337 uniqtag.hdr.tag_len = htons((u_int16_t)sizeof(sp));
1338 uniqtag.data.pointer = sp;
1340 insert_tag(sp, &neg->ac_name.hdr); /* AC_NAME */
1341 if ((tag = get_tag(ph, PTT_SRV_NAME)))
1342 insert_tag(sp, tag); /* return service */
1344 * If we have a NULL service request
1345 * and have an extra service defined in this hook,
1346 * then also add a tag for the extra service.
1347 * XXX this is a hack. eventually we should be able
1348 * to support advertising many services, not just one
1350 if (((tag == NULL) || (tag->tag_len == 0))
1351 && (neg->service.hdr.tag_len != 0)) {
1352 insert_tag(sp, &neg->service.hdr); /* SERVICE */
1354 if ((tag = get_tag(ph, PTT_HOST_UNIQ)))
1355 insert_tag(sp, tag); /* returned hostunique */
1356 insert_tag(sp, &uniqtag.hdr);
1363 * Packets coming from the hook make no sense
1364 * to sessions in these states. Throw them away.
1370 case PPPOE_LISTENING:
1377 NG_FREE_DATA(m, meta);
1382 * Do local shutdown processing..
1383 * If we are a persistant device, we might refuse to go away, and
1384 * we'd only remove our links and reset ourself.
1387 ng_pppoe_rmnode(node_p node)
1389 const priv_p privdata = node->private;
1392 node->flags |= NG_INVALID;
1395 node->private = NULL;
1396 ng_unref(privdata->node);
1397 kfree(privdata, M_NETGRAPH);
1402 * This is called once we've already connected a new hook to the other node.
1403 * It gives us a chance to balk at the last minute.
1406 ng_pppoe_connect(hook_p hook)
1408 /* be really amiable and just say "YUP that's OK by me! " */
1413 * Hook disconnection
1415 * Clean up all dangling links and information about the session/hook.
1416 * For this type, removal of the last link destroys the node
1419 ng_pppoe_disconnect(hook_p hook)
1421 node_p node = hook->node;
1422 priv_p privp = node->private;
1427 hooks = node->numhooks; /* this one already not counted */
1428 if (hook->private == &privp->debug_hook) {
1429 privp->debug_hook = NULL;
1430 } else if (hook->private == &privp->ethernet_hook) {
1431 privp->ethernet_hook = NULL;
1435 if (sp->state != PPPOE_SNONE ) {
1436 pppoe_send_event(sp, NGM_PPPOE_CLOSE);
1439 * According to the spec, if we are connected,
1440 * we should send a DISC packet if we are shutting down
1443 if ((privp->ethernet_hook)
1444 && ((sp->state == PPPOE_CONNECTED)
1445 || (sp->state == PPPOE_NEWCONNECTED))) {
1447 struct pppoe_full_hdr *wh;
1448 struct pppoe_tag *tag;
1449 int msglen = strlen(SIGNOFF);
1453 /* revert the stored header to DISC/PADT mode */
1455 wh->ph.code = PADT_CODE;
1456 if (pppoe_mode == PPPOE_NONSTANDARD)
1457 wh->eh.ether_type = ETHERTYPE_PPPOE_STUPID_DISC;
1459 wh->eh.ether_type = ETHERTYPE_PPPOE_DISC;
1461 /* generate a packet of that type */
1462 MGETHDR(m, MB_DONTWAIT, MT_DATA);
1464 kprintf("pppoe: Session out of mbufs\n");
1466 m->m_pkthdr.rcvif = NULL;
1467 m->m_pkthdr.len = m->m_len = sizeof(*wh);
1468 bcopy((caddr_t)wh, mtod(m, caddr_t),
1471 * Add a General error message and adjust
1474 wh = mtod(m, struct pppoe_full_hdr *);
1476 tag->tag_type = PTT_GEN_ERR;
1477 tag->tag_len = htons((u_int16_t)msglen);
1478 strncpy(tag->tag_data, SIGNOFF, msglen);
1479 m->m_pkthdr.len = (m->m_len += sizeof(*tag) +
1481 wh->ph.length = htons(sizeof(*tag) + msglen);
1482 NG_SEND_DATA(error, privp->ethernet_hook, m,
1487 * As long as we have somewhere to store the timeout handle,
1488 * we may have a timeout pending.. get rid of it.
1491 callout_stop(&sp->neg->timeout_ch);
1493 m_freem(sp->neg->m);
1494 kfree(sp->neg, M_NETGRAPH);
1496 kfree(sp, M_NETGRAPH);
1497 hook->private = NULL;
1498 /* work out how many session hooks there are */
1499 /* Node goes away on last session hook removal */
1500 if (privp->ethernet_hook) hooks -= 1;
1501 if (privp->debug_hook) hooks -= 1;
1503 if (node->numhooks == 0)
1509 * timeouts come here.
1512 pppoe_ticker(void *arg)
1515 sessp sp = hook->private;
1518 struct mbuf *m0 = NULL;
1519 priv_p privp = hook->node->private;
1520 meta_p dummy = NULL;
1526 * resend the last packet, using an exponential backoff.
1527 * After a period of time, stop growing the backoff,
1528 * and either leave it, or revert to the start.
1532 /* timeouts on these produce resends */
1533 m0 = m_copypacket(sp->neg->m, MB_DONTWAIT);
1534 NG_SEND_DATA( error, privp->ethernet_hook, m0, dummy);
1535 callout_reset(&neg->timeout_ch, neg->timeout * hz,
1536 pppoe_ticker, hook);
1537 if ((neg->timeout <<= 1) > PPPOE_TIMEOUT_LIMIT) {
1538 if (sp->state == PPPOE_SREQ) {
1539 /* revert to SINIT mode */
1542 neg->timeout = PPPOE_TIMEOUT_LIMIT;
1548 /* a timeout on these says "give up" */
1549 ng_destroy_hook(hook);
1552 /* timeouts have no meaning in other states */
1553 kprintf("pppoe: unexpected timeout\n");
1560 sendpacket(sessp sp)
1563 struct mbuf *m0 = NULL;
1564 hook_p hook = sp->hook;
1566 priv_p privp = hook->node->private;
1567 meta_p dummy = NULL;
1571 case PPPOE_LISTENING:
1574 case PPPOE_CONNECTED:
1575 kprintf("pppoe: sendpacket: unexpected state\n");
1578 case PPPOE_NEWCONNECTED:
1579 /* send the PADS without a timeout - we're now connected */
1580 m0 = m_copypacket(sp->neg->m, MB_DONTWAIT);
1581 NG_SEND_DATA( error, privp->ethernet_hook, m0, dummy);
1585 /* No packet to send, but set up the timeout */
1586 callout_reset(&neg->timeout_ch, PPPOE_OFFER_TIMEOUT * hz,
1587 pppoe_ticker, hook);
1592 * send the offer but if they don't respond
1593 * in PPPOE_OFFER_TIMEOUT seconds, forget about it.
1595 m0 = m_copypacket(sp->neg->m, MB_DONTWAIT);
1596 NG_SEND_DATA( error, privp->ethernet_hook, m0, dummy);
1597 callout_reset(&neg->timeout_ch, PPPOE_OFFER_TIMEOUT * hz,
1598 pppoe_ticker, hook);
1603 m0 = m_copypacket(sp->neg->m, MB_DONTWAIT);
1604 NG_SEND_DATA( error, privp->ethernet_hook, m0, dummy);
1605 callout_reset(&neg->timeout_ch, PPPOE_INITIAL_TIMEOUT * hz,
1606 pppoe_ticker, hook);
1607 neg->timeout = PPPOE_INITIAL_TIMEOUT * 2;
1612 kprintf("pppoe: timeout: bad state\n");
1614 /* return (error); */
1618 * Parse an incoming packet to see if any tags should be copied to the
1619 * output packet. Don't do any tags that have been handled in the main
1622 static const struct pppoe_tag*
1623 scan_tags(sessp sp, const struct pppoe_hdr* ph)
1625 const char *const end = (const char *)next_tag(ph);
1627 const struct pppoe_tag *pt = &ph->tag[0];
1629 * Keep processing tags while a tag header will still fit.
1632 while((const char*)(pt + 1) <= end) {
1634 * If the tag data would go past the end of the packet, abort.
1636 ptn = (((const char *)(pt + 1)) + ntohs(pt->tag_len));
1640 switch (pt->tag_type) {
1656 pt = (const struct pppoe_tag*)ptn;
1662 pppoe_send_event(sessp sp, enum cmd cmdid)
1665 struct ng_mesg *msg;
1666 struct ngpppoe_sts *sts;
1669 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, cmdid,
1670 sizeof(struct ngpppoe_sts), M_NOWAIT);
1673 sts = (struct ngpppoe_sts *)msg->data;
1674 strlcpy(sts->hook, sp->hook->name, NG_HOOKSIZ);
1675 error = ng_send_msg(sp->hook->node, msg, sp->creator, NULL);