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37 * Author: Julian Elischer <julian@freebsd.org>
40 * $Whistle: ng_pppoe.c,v 1.10 1999/11/01 09:24:52 julian Exp $
43 #define AAA printf("pppoe: %s\n", __func__ );
44 #define BBB printf("-%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 <net/ethernet.h>
59 #include <netgraph/ng_message.h>
60 #include <netgraph/netgraph.h>
61 #include <netgraph/ng_parse.h>
62 #include <netgraph/ng_pppoe.h>
64 #ifdef NG_SEPARATE_MALLOC
65 MALLOC_DEFINE(M_NETGRAPH_PPPOE, "netgraph_pppoe", "netgraph pppoe node");
67 #define M_NETGRAPH_PPPOE M_NETGRAPH
70 #define SIGNOFF "session closed"
71 #define OFFSETOF(s, e) ((char *)&((s *)0)->e - (char *)((s *)0))
74 * This section contains the netgraph method declarations for the
75 * pppoe node. These methods define the netgraph pppoe 'type'.
78 static ng_constructor_t ng_pppoe_constructor;
79 static ng_rcvmsg_t ng_pppoe_rcvmsg;
80 static ng_shutdown_t ng_pppoe_shutdown;
81 static ng_newhook_t ng_pppoe_newhook;
82 static ng_connect_t ng_pppoe_connect;
83 static ng_rcvdata_t ng_pppoe_rcvdata;
84 static ng_disconnect_t ng_pppoe_disconnect;
86 /* Parse type for struct ngpppoe_init_data */
87 static const struct ng_parse_struct_field ngpppoe_init_data_type_fields[]
88 = NG_PPPOE_INIT_DATA_TYPE_INFO;
89 static const struct ng_parse_type ngpppoe_init_data_state_type = {
90 &ng_parse_struct_type,
91 &ngpppoe_init_data_type_fields
94 /* Parse type for struct ngpppoe_sts */
95 static const struct ng_parse_struct_field ng_pppoe_sts_type_fields[]
96 = NG_PPPOE_STS_TYPE_INFO;
97 static const struct ng_parse_type ng_pppoe_sts_state_type = {
98 &ng_parse_struct_type,
99 &ng_pppoe_sts_type_fields
102 /* List of commands and how to convert arguments to/from ASCII */
103 static const struct ng_cmdlist ng_pppoe_cmds[] = {
108 &ngpppoe_init_data_state_type,
115 &ngpppoe_init_data_state_type,
122 &ngpppoe_init_data_state_type,
129 &ngpppoe_init_data_state_type,
136 &ng_pppoe_sts_state_type,
143 &ng_pppoe_sts_state_type,
150 &ng_pppoe_sts_state_type,
156 /* Netgraph node type descriptor */
157 static struct ng_type typestruct = {
161 ng_pppoe_constructor,
171 NETGRAPH_INIT(pppoe, &typestruct);
172 /* Depend on ng_ether so we can use the Ethernet parse type */
173 MODULE_DEPEND(ng_pppoe, ng_ether, 1, 1, 1);
176 * States for the session state machine.
177 * These have no meaning if there is no hook attached yet.
180 PPPOE_SNONE=0, /* [both] Initial state */
181 PPPOE_LISTENING, /* [Daemon] Listening for discover initiation pkt */
182 PPPOE_SINIT, /* [Client] Sent discovery initiation */
183 PPPOE_PRIMED, /* [Server] Awaiting PADI from daemon */
184 PPPOE_SOFFER, /* [Server] Sent offer message (got PADI)*/
185 PPPOE_SREQ, /* [Client] Sent a Request */
186 PPPOE_NEWCONNECTED, /* [Server] Connection established, No data received */
187 PPPOE_CONNECTED, /* [Both] Connection established, Data received */
188 PPPOE_DEAD /* [Both] */
191 #define NUMTAGS 20 /* number of tags we are set up to work with */
194 * Information we store for each hook on each node for negotiating the
195 * session. The mbuf and cluster are freed once negotiation has completed.
196 * The whole negotiation block is then discarded.
200 struct mbuf *m; /* holds cluster with last sent packet */
201 union packet *pkt; /* points within the above cluster */
202 struct callout_handle timeout_handle; /* see timeout(9) */
203 u_int timeout; /* 0,1,2,4,8,16 etc. seconds */
205 const struct pppoe_tag *tags[NUMTAGS];
209 struct datatag service;
210 struct datatag ac_name;
212 typedef struct sess_neg *negp;
215 * Session information that is needed after connection.
219 u_int16_t Session_ID;
221 ng_ID_t creator; /* who to notify */
222 struct pppoe_full_hdr pkt_hdr; /* used when connected */
223 negp neg; /* used when negotiating */
224 /*struct sess_con *hash_next;*/ /* not yet used */
226 typedef struct sess_con *sessp;
229 * Information we store for each node
232 node_p node; /* back pointer to node */
233 hook_p ethernet_hook;
235 u_int packets_in; /* packets in from ethernet */
236 u_int packets_out; /* packets out towards ethernet */
238 /*struct sess_con *buckets[HASH_SIZE];*/ /* not yet used */
240 typedef struct PPPOE *priv_p;
242 struct ether_header eh_prototype =
243 {{0xff,0xff,0xff,0xff,0xff,0xff},
244 {0x00,0x00,0x00,0x00,0x00,0x00},
245 ETHERTYPE_PPPOE_DISC};
247 static int nonstandard;
249 ngpppoe_set_ethertype(SYSCTL_HANDLER_ARGS)
255 error = sysctl_handle_int(oidp, &val, sizeof(int), req);
256 if (error != 0 || req->newptr == NULL)
260 eh_prototype.ether_type = ETHERTYPE_PPPOE_STUPID_DISC;
263 eh_prototype.ether_type = ETHERTYPE_PPPOE_DISC;
268 SYSCTL_PROC(_net_graph, OID_AUTO, nonstandard_pppoe, CTLTYPE_INT | CTLFLAG_RW,
269 0, sizeof(int), ngpppoe_set_ethertype, "I", "select normal or stupid ISP");
272 char bytes[sizeof(void *)];
276 #define LEAVE(x) do { error = x; goto quit; } while(0)
277 static void pppoe_start(sessp sp);
278 static void sendpacket(sessp sp);
279 static void pppoe_ticker(void *arg);
280 static const struct pppoe_tag *scan_tags(sessp sp,
281 const struct pppoe_hdr* ph);
282 static int pppoe_send_event(sessp sp, enum cmd cmdid);
284 /*************************************************************************
285 * Some basic utilities from the Linux version with author's permission.*
286 * Author: Michal Ostrowski <mostrows@styx.uwaterloo.ca> *
287 ************************************************************************/
290 * Generate a new session id
291 * XXX find out the FreeBSD locking scheme.
294 get_new_sid(node_p node)
296 static int pppoe_sid = 10;
300 priv_p privp = NG_NODE_PRIVATE(node);
306 * Spec says 0xFFFF is reserved.
307 * Also don't use 0x0000
314 /* Check it isn't already in use */
315 LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) {
316 /* don't check special hooks */
317 if ((NG_HOOK_PRIVATE(hook) == &privp->debug_hook)
318 || (NG_HOOK_PRIVATE(hook) == &privp->ethernet_hook))
320 sp = NG_HOOK_PRIVATE(hook);
321 if (sp->Session_ID == val)
330 * Return the location where the next tag can be put
332 static __inline const struct pppoe_tag*
333 next_tag(const struct pppoe_hdr* ph)
335 return (const struct pppoe_tag*)(((const char*)&ph->tag[0])
336 + ntohs(ph->length));
340 * Look for a tag of a specific type
341 * Don't trust any length the other end says.
342 * but assume we already sanity checked ph->length.
344 static const struct pppoe_tag*
345 get_tag(const struct pppoe_hdr* ph, u_int16_t idx)
347 const char *const end = (const char *)next_tag(ph);
349 const struct pppoe_tag *pt = &ph->tag[0];
351 * Keep processing tags while a tag header will still fit.
354 while((const char*)(pt + 1) <= end) {
356 * If the tag data would go past the end of the packet, abort.
358 ptn = (((const char *)(pt + 1)) + ntohs(pt->tag_len));
362 if(pt->tag_type == idx)
365 pt = (const struct pppoe_tag*)ptn;
370 /**************************************************************************
371 * inlines to initialise or add tags to a session's tag list,
372 **************************************************************************/
374 * Initialise the session's tag list
380 if(sp->neg == NULL) {
381 printf("pppoe: asked to init NULL neg pointer\n");
384 sp->neg->numtags = 0;
388 insert_tag(sessp sp, const struct pppoe_tag *tp)
394 if((neg = sp->neg) == NULL) {
395 printf("pppoe: asked to use NULL neg pointer\n");
398 if ((i = neg->numtags++) < NUMTAGS) {
401 printf("pppoe: asked to add too many tags to packet\n");
407 * Make up a packet, using the tags filled out for the session.
409 * Assume that the actual pppoe header and ethernet header
410 * are filled out externally to this routine.
411 * Also assume that neg->wh points to the correct
412 * location at the front of the buffer space.
415 make_packet(sessp sp) {
416 struct pppoe_full_hdr *wh = &sp->neg->pkt->pkt_header;
417 const struct pppoe_tag **tag;
421 u_int16_t length = 0;
424 if ((sp->neg == NULL) || (sp->neg->m == NULL)) {
425 printf("pppoe: make_packet called from wrong state\n");
427 dp = (char *)wh->ph.tag;
428 for (count = 0, tag = sp->neg->tags;
429 ((count < sp->neg->numtags) && (count < NUMTAGS));
431 tlen = ntohs((*tag)->tag_len) + sizeof(**tag);
432 if ((length + tlen) > (ETHER_MAX_LEN - 4 - sizeof(*wh))) {
433 printf("pppoe: tags too long\n");
434 sp->neg->numtags = count;
435 break; /* XXX chop off what's too long */
437 bcopy(*tag, (char *)dp, tlen);
441 wh->ph.length = htons(length);
442 sp->neg->m->m_len = length + sizeof(*wh);
443 sp->neg->m->m_pkthdr.len = length + sizeof(*wh);
446 /**************************************************************************
447 * Routine to match a service offered *
448 **************************************************************************/
450 * Find a hook that has a service string that matches that
451 * we are seeking. for now use a simple string.
452 * In the future we may need something like regexp().
453 * for testing allow a null string to match 1st found and a null service
454 * to match all requests. Also make '*' do the same.
457 #define NG_MATCH_EXACT 1
458 #define NG_MATCH_ANY 2
461 pppoe_match_svc(node_p node, const char *svc_name, int svc_len, int match)
465 priv_p privp = NG_NODE_PRIVATE(node);
466 hook_p allhook = NULL;
470 LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) {
472 /* skip any hook that is debug or ethernet */
473 if ((NG_HOOK_PRIVATE(hook) == &privp->debug_hook)
474 || (NG_HOOK_PRIVATE(hook) == &privp->ethernet_hook))
476 sp = NG_HOOK_PRIVATE(hook);
478 /* Skip any sessions which are not in LISTEN mode. */
479 if ( sp->state != PPPOE_LISTENING)
484 /* Special case for a blank or "*" service name (wildcard) */
485 if (match == NG_MATCH_ANY && neg->service_len == 1 &&
486 neg->service.data[0] == '*') {
491 /* If the lengths don't match, that aint it. */
492 if (neg->service_len != svc_len)
495 /* An exact match? */
499 if (strncmp(svc_name, neg->service.data, svc_len) == 0)
502 return (hook ? hook : allhook);
504 /**************************************************************************
505 * Routine to find a particular session that matches an incoming packet *
506 **************************************************************************/
508 pppoe_findsession(node_p node, const struct pppoe_full_hdr *wh)
512 priv_p privp = NG_NODE_PRIVATE(node);
513 u_int16_t session = ntohs(wh->ph.sid);
516 * find matching peer/session combination.
519 LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) {
520 /* don't check special hooks */
521 if ((NG_HOOK_PRIVATE(hook) == &privp->debug_hook)
522 || (NG_HOOK_PRIVATE(hook) == &privp->ethernet_hook)) {
525 sp = NG_HOOK_PRIVATE(hook);
526 if ( ( (sp->state == PPPOE_CONNECTED)
527 || (sp->state == PPPOE_NEWCONNECTED) )
528 && (sp->Session_ID == session)
529 && (bcmp(sp->pkt_hdr.eh.ether_dhost,
531 ETHER_ADDR_LEN)) == 0) {
539 pppoe_finduniq(node_p node, const struct pppoe_tag *tag)
542 priv_p privp = NG_NODE_PRIVATE(node);
546 bcopy(tag->tag_data, uniq.bytes, sizeof(void *));
547 /* cycle through all known hooks */
548 LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) {
549 /* don't check special hooks */
550 if ((NG_HOOK_PRIVATE(hook) == &privp->debug_hook)
551 || (NG_HOOK_PRIVATE(hook) == &privp->ethernet_hook))
553 if (uniq.pointer == NG_HOOK_PRIVATE(hook))
559 /**************************************************************************
560 * start of Netgraph entrypoints *
561 **************************************************************************/
564 * Allocate the private data structure and the generic node
565 * and link them together.
567 * ng_make_node_common() returns with a generic node struct
568 * with a single reference for us.. we transfer it to the
569 * private structure.. when we free the private struct we must
570 * unref the node so it gets freed too.
573 ng_pppoe_constructor(node_p node)
578 /* Initialize private descriptor */
579 MALLOC(privdata, priv_p, sizeof(*privdata), M_NETGRAPH_PPPOE,
581 if (privdata == NULL)
584 /* Link structs together; this counts as our one reference to *nodep */
585 NG_NODE_SET_PRIVATE(node, privdata);
586 privdata->node = node;
591 * Give our ok for a hook to be added...
592 * point the hook's private info to the hook structure.
594 * The following hook names are special:
595 * Ethernet: the hook that should be connected to a NIC.
596 * debug: copies of data sent out here (when I write the code).
597 * All other hook names need only be unique. (the framework checks this).
600 ng_pppoe_newhook(node_p node, hook_p hook, const char *name)
602 const priv_p privp = NG_NODE_PRIVATE(node);
606 if (strcmp(name, NG_PPPOE_HOOK_ETHERNET) == 0) {
607 privp->ethernet_hook = hook;
608 NG_HOOK_SET_PRIVATE(hook, &privp->ethernet_hook);
609 } else if (strcmp(name, NG_PPPOE_HOOK_DEBUG) == 0) {
610 privp->debug_hook = hook;
611 NG_HOOK_SET_PRIVATE(hook, &privp->debug_hook);
614 * Any other unique name is OK.
615 * The infrastructure has already checked that it's unique,
616 * so just allocate it and hook it in.
618 MALLOC(sp, sessp, sizeof(*sp), M_NETGRAPH_PPPOE, M_NOWAIT | M_ZERO);
623 NG_HOOK_SET_PRIVATE(hook, sp);
630 * Get a netgraph control message.
631 * Check it is one we understand. If needed, send a response.
632 * We sometimes save the address for an async action later.
633 * Always free the message.
636 ng_pppoe_rcvmsg(node_p node, item_p item, hook_p lasthook)
638 priv_p privp = NG_NODE_PRIVATE(node);
639 struct ngpppoe_init_data *ourmsg = NULL;
640 struct ng_mesg *resp = NULL;
648 NGI_GET_MSG(item, msg);
649 /* Deal with message according to cookie and command */
650 switch (msg->header.typecookie) {
651 case NGM_PPPOE_COOKIE:
652 switch (msg->header.cmd) {
653 case NGM_PPPOE_CONNECT:
654 case NGM_PPPOE_LISTEN:
655 case NGM_PPPOE_OFFER:
656 case NGM_PPPOE_SERVICE:
657 ourmsg = (struct ngpppoe_init_data *)msg->data;
658 if (msg->header.arglen < sizeof(*ourmsg)) {
659 printf("pppoe: init data too small\n");
662 if (msg->header.arglen - sizeof(*ourmsg) >
663 PPPOE_SERVICE_NAME_SIZE) {
664 printf("pppoe_rcvmsg: service name too big");
667 if (msg->header.arglen - sizeof(*ourmsg) <
669 printf("pppoe: init data has bad length,"
670 " %d should be %d\n", ourmsg->data_len,
671 msg->header.arglen - sizeof (*ourmsg));
675 /* make sure strcmp will terminate safely */
676 ourmsg->hook[sizeof(ourmsg->hook) - 1] = '\0';
678 /* cycle through all known hooks */
679 LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) {
680 if (NG_HOOK_NAME(hook)
681 && strcmp(NG_HOOK_NAME(hook), ourmsg->hook) == 0)
687 if ((NG_HOOK_PRIVATE(hook) == &privp->debug_hook)
688 || (NG_HOOK_PRIVATE(hook) == &privp->ethernet_hook)) {
691 sp = NG_HOOK_PRIVATE(hook);
693 if (msg->header.cmd == NGM_PPPOE_LISTEN) {
695 * Ensure we aren't already listening for this
698 if (pppoe_match_svc(node, ourmsg->data,
699 ourmsg->data_len, NG_MATCH_EXACT) != NULL) {
705 * PPPOE_SERVICE advertisments are set up
706 * on sessions that are in PRIMED state.
708 if (msg->header.cmd == NGM_PPPOE_SERVICE) {
711 if (sp->state |= PPPOE_SNONE) {
712 printf("pppoe: Session already active\n");
717 * set up prototype header
719 MALLOC(neg, negp, sizeof(*neg), M_NETGRAPH_PPPOE,
723 printf("pppoe: Session out of memory\n");
726 MGETHDR(neg->m, M_DONTWAIT, MT_DATA);
728 printf("pppoe: Session out of mbufs\n");
729 FREE(neg, M_NETGRAPH_PPPOE);
732 neg->m->m_pkthdr.rcvif = NULL;
733 MCLGET(neg->m, M_DONTWAIT);
734 if ((neg->m->m_flags & M_EXT) == 0) {
735 printf("pppoe: Session out of mcls\n");
737 FREE(neg, M_NETGRAPH_PPPOE);
741 callout_handle_init( &neg->timeout_handle);
742 neg->m->m_len = sizeof(struct pppoe_full_hdr);
743 neg->pkt = mtod(neg->m, union packet*);
744 neg->pkt->pkt_header.eh = eh_prototype;
745 neg->pkt->pkt_header.ph.ver = 0x1;
746 neg->pkt->pkt_header.ph.type = 0x1;
747 neg->pkt->pkt_header.ph.sid = 0x0000;
750 sp->creator = NGI_RETADDR(item);
752 switch (msg->header.cmd) {
753 case NGM_PPPOE_GET_STATUS:
755 struct ngpppoestat *stats;
757 NG_MKRESPONSE(resp, msg, sizeof(*stats), M_NOWAIT);
761 stats = (struct ngpppoestat *) resp->data;
762 stats->packets_in = privp->packets_in;
763 stats->packets_out = privp->packets_out;
766 case NGM_PPPOE_CONNECT:
768 * Check the hook exists and is Uninitialised.
769 * Send a PADI request, and start the timeout logic.
770 * Store the originator of this message so we can send
771 * a success of fail message to them later.
772 * Move the session to SINIT
773 * Set up the session to the correct state and
776 neg->service.hdr.tag_type = PTT_SRV_NAME;
777 neg->service.hdr.tag_len =
778 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;
785 case NGM_PPPOE_LISTEN:
787 * Check the hook exists and is Uninitialised.
788 * Install the service matching string.
789 * Store the originator of this message so we can send
790 * a success of fail message to them later.
791 * Move the hook to 'LISTENING'
793 neg->service.hdr.tag_type = PTT_SRV_NAME;
794 neg->service.hdr.tag_len =
795 htons((u_int16_t)ourmsg->data_len);
797 if (ourmsg->data_len)
798 bcopy(ourmsg->data, neg->service.data,
800 neg->service_len = ourmsg->data_len;
801 neg->pkt->pkt_header.ph.code = PADT_CODE;
803 * wait for PADI packet coming from ethernet
805 sp->state = PPPOE_LISTENING;
807 case NGM_PPPOE_OFFER:
809 * Check the hook exists and is Uninitialised.
810 * Store the originator of this message so we can send
811 * a success of fail message to them later.
812 * Store the AC-Name given and go to PRIMED.
814 neg->ac_name.hdr.tag_type = PTT_AC_NAME;
815 neg->ac_name.hdr.tag_len =
816 htons((u_int16_t)ourmsg->data_len);
817 if (ourmsg->data_len)
818 bcopy(ourmsg->data, neg->ac_name.data,
820 neg->ac_name_len = ourmsg->data_len;
821 neg->pkt->pkt_header.ph.code = PADO_CODE;
823 * Wait for PADI packet coming from hook
825 sp->state = PPPOE_PRIMED;
827 case NGM_PPPOE_SERVICE:
829 * Check the session is primed.
830 * for now just allow ONE service to be advertised.
831 * If you do it twice you just overwrite.
833 if (sp->state != PPPOE_PRIMED) {
834 printf("pppoe: Session not primed\n");
838 neg->service.hdr.tag_type = PTT_SRV_NAME;
839 neg->service.hdr.tag_len =
840 htons((u_int16_t)ourmsg->data_len);
842 if (ourmsg->data_len)
843 bcopy(ourmsg->data, neg->service.data,
845 neg->service_len = ourmsg->data_len;
855 /* Take care of synchronous response, if any */
857 NG_RESPOND_MSG(error, node, item, resp);
858 /* Free the message and return */
864 * Start a client into the first state. A separate function because
865 * it can be needed if the negotiation times out.
868 pppoe_start(sessp sp)
871 struct pppoe_tag hdr;
873 } __attribute ((packed)) uniqtag;
876 * kick the state machine into starting up
879 sp->state = PPPOE_SINIT;
880 /* reset the packet header to broadcast */
881 sp->neg->pkt->pkt_header.eh = eh_prototype;
882 sp->neg->pkt->pkt_header.ph.code = PADI_CODE;
883 uniqtag.hdr.tag_type = PTT_HOST_UNIQ;
884 uniqtag.hdr.tag_len = htons((u_int16_t)sizeof(uniqtag.data));
885 uniqtag.data.pointer = sp;
887 insert_tag(sp, &uniqtag.hdr);
888 insert_tag(sp, &sp->neg->service.hdr);
894 send_acname(sessp sp, const struct pppoe_tag *tag)
898 struct ngpppoe_sts *sts;
900 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_ACNAME,
901 sizeof(struct ngpppoe_sts), M_NOWAIT);
905 sts = (struct ngpppoe_sts *)msg->data;
906 strncpy(sts->hook, tag->tag_data,
907 min(NG_HOOKLEN + 1, ntohs(tag->tag_len)));
908 NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, NULL);
914 send_sessionid(sessp sp)
919 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_SESSIONID,
920 sizeof(u_int16_t), M_NOWAIT);
924 *(u_int16_t *)msg->data = sp->Session_ID;
925 NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, NULL);
931 * Receive data, and do something with it.
932 * The caller will never free m or meta, so
933 * if we use up this data or abort we must free BOTH of these.
936 ng_pppoe_rcvdata(hook_p hook, item_p item)
938 node_p node = NG_HOOK_NODE(hook);
939 const priv_p privp = NG_NODE_PRIVATE(node);
940 sessp sp = NG_HOOK_PRIVATE(hook);
941 const struct pppoe_full_hdr *wh;
942 const struct pppoe_hdr *ph;
947 const struct pppoe_tag *utag = NULL, *tag = NULL;
950 struct pppoe_tag hdr;
952 } __attribute ((packed)) uniqtag;
958 if (NG_HOOK_PRIVATE(hook) == &privp->debug_hook) {
960 * Data from the debug hook gets sent without modification
961 * straight to the ethernet.
963 NG_FWD_ITEM_HOOK( error, item, privp->ethernet_hook);
964 privp->packets_out++;
965 } else if (NG_HOOK_PRIVATE(hook) == &privp->ethernet_hook) {
968 * Dig out various fields from the packet.
969 * use them to decide where to send it.
973 if( m->m_len < sizeof(*wh)) {
974 m = m_pullup(m, sizeof(*wh)); /* Checks length */
976 printf("couldn't m_pullup\n");
980 wh = mtod(m, struct pppoe_full_hdr *);
981 length = ntohs(wh->ph.length);
982 switch(wh->eh.ether_type) {
983 case ETHERTYPE_PPPOE_STUPID_DISC:
985 eh_prototype.ether_type = ETHERTYPE_PPPOE_STUPID_DISC;
987 case ETHERTYPE_PPPOE_DISC:
989 * We need to try to make sure that the tag area
990 * is contiguous, or we could wander off the end
991 * of a buffer and make a mess.
992 * (Linux wouldn't have this problem).
994 if (m->m_pkthdr.len <= MHLEN) {
995 if( m->m_len < m->m_pkthdr.len) {
996 m = m_pullup(m, m->m_pkthdr.len);
998 printf("couldn't m_pullup\n");
1003 if (m->m_len != m->m_pkthdr.len) {
1005 * It's not all in one piece.
1006 * We need to do extra work.
1007 * Put it into a cluster.
1010 n = m_dup(m, M_DONTWAIT);
1014 /* just check we got a cluster */
1015 if (m->m_len != m->m_pkthdr.len) {
1021 printf("packet fragmented\n");
1025 wh = mtod(m, struct pppoe_full_hdr *);
1026 length = ntohs(wh->ph.length);
1028 session = ntohs(wh->ph.sid);
1035 * Look for a hook with the required service
1036 * and send the ENTIRE packet up there.
1037 * It should come back to a new hook in
1038 * PRIMED state. Look there for further
1041 tag = get_tag(ph, PTT_SRV_NAME);
1043 printf("no service tag\n");
1046 sendhook = pppoe_match_svc(NG_HOOK_NODE(hook),
1047 tag->tag_data, ntohs(tag->tag_len),
1050 NG_FWD_NEW_DATA(error, item,
1059 * Use the host_uniq tag to find the
1060 * hook this is in response to.
1061 * Received #2, now send #3
1062 * For now simply accept the first we receive.
1064 utag = get_tag(ph, PTT_HOST_UNIQ);
1066 || (ntohs(utag->tag_len) != sizeof(sp))) {
1067 printf("no host unique field\n");
1071 sendhook = pppoe_finduniq(node, utag);
1072 if (sendhook == NULL) {
1073 printf("no matching session\n");
1078 * Check the session is in the right state.
1079 * It needs to be in PPPOE_SINIT.
1081 sp = NG_HOOK_PRIVATE(sendhook);
1082 if (sp->state != PPPOE_SINIT) {
1083 printf("session in wrong state\n");
1087 untimeout(pppoe_ticker, sendhook,
1088 neg->timeout_handle);
1091 * This is the first time we hear
1092 * from the server, so note it's
1093 * unicast address, replacing the
1094 * broadcast address .
1096 bcopy(wh->eh.ether_shost,
1097 neg->pkt->pkt_header.eh.ether_dhost,
1100 neg->pkt->pkt_header.ph.code = PADR_CODE;
1102 insert_tag(sp, utag); /* Host Unique */
1103 if ((tag = get_tag(ph, PTT_AC_COOKIE)))
1104 insert_tag(sp, tag); /* return cookie */
1105 if ((tag = get_tag(ph, PTT_AC_NAME))) {
1106 insert_tag(sp, tag); /* return it */
1107 send_acname(sp, tag);
1109 insert_tag(sp, &neg->service.hdr); /* Service */
1112 sp->state = PPPOE_SREQ;
1119 * Use the ac_cookie tag to find the
1120 * hook this is in response to.
1122 utag = get_tag(ph, PTT_AC_COOKIE);
1124 || (ntohs(utag->tag_len) != sizeof(sp))) {
1128 sendhook = pppoe_finduniq(node, utag);
1129 if (sendhook == NULL) {
1134 * Check the session is in the right state.
1135 * It needs to be in PPPOE_SOFFER
1136 * or PPPOE_NEWCONNECTED. If the latter,
1137 * then this is a retry by the client.
1138 * so be nice, and resend.
1140 sp = NG_HOOK_PRIVATE(sendhook);
1141 if (sp->state == PPPOE_NEWCONNECTED) {
1143 * Whoa! drop back to resend that
1145 * We should still have a copy of it.
1147 sp->state = PPPOE_SOFFER;
1149 if (sp->state != PPPOE_SOFFER) {
1150 LEAVE (ENETUNREACH);
1154 untimeout(pppoe_ticker, sendhook,
1155 neg->timeout_handle);
1156 neg->pkt->pkt_header.ph.code = PADS_CODE;
1157 if (sp->Session_ID == 0)
1158 neg->pkt->pkt_header.ph.sid =
1159 htons(sp->Session_ID
1160 = get_new_sid(node));
1164 * start working out the tags to respond with.
1167 insert_tag(sp, &neg->ac_name.hdr); /* AC_NAME */
1168 if ((tag = get_tag(ph, PTT_SRV_NAME)))
1169 insert_tag(sp, tag);/* return service */
1170 if ((tag = get_tag(ph, PTT_HOST_UNIQ)))
1171 insert_tag(sp, tag); /* return it */
1172 insert_tag(sp, utag); /* ac_cookie */
1175 sp->state = PPPOE_NEWCONNECTED;
1178 * Having sent the last Negotiation header,
1179 * Set up the stored packet header to
1180 * be correct for the actual session.
1181 * But keep the negotialtion stuff
1182 * around in case we need to resend this last
1183 * packet. We'll discard it when we move
1184 * from NEWCONNECTED to CONNECTED
1186 sp->pkt_hdr = neg->pkt->pkt_header;
1188 sp->pkt_hdr.eh.ether_type
1189 = ETHERTYPE_PPPOE_STUPID_SESS;
1191 sp->pkt_hdr.eh.ether_type
1192 = ETHERTYPE_PPPOE_SESS;
1193 sp->pkt_hdr.ph.code = 0;
1194 pppoe_send_event(sp, NGM_PPPOE_SUCCESS);
1199 * Use the host_uniq tag to find the
1200 * hook this is in response to.
1201 * take the session ID and store it away.
1202 * Also make sure the pre-made header is
1203 * correct and set us into Session mode.
1205 utag = get_tag(ph, PTT_HOST_UNIQ);
1207 || (ntohs(utag->tag_len) != sizeof(sp))) {
1208 LEAVE (ENETUNREACH);
1211 sendhook = pppoe_finduniq(node, utag);
1212 if (sendhook == NULL) {
1217 * Check the session is in the right state.
1218 * It needs to be in PPPOE_SREQ.
1220 sp = NG_HOOK_PRIVATE(sendhook);
1221 if (sp->state != PPPOE_SREQ) {
1225 untimeout(pppoe_ticker, sendhook,
1226 neg->timeout_handle);
1227 neg->pkt->pkt_header.ph.sid = wh->ph.sid;
1228 sp->Session_ID = ntohs(wh->ph.sid);
1231 sp->state = PPPOE_CONNECTED;
1233 * Now we have gone to Connected mode,
1234 * Free all resources needed for
1236 * Keep a copy of the header we will be using.
1238 sp->pkt_hdr = neg->pkt->pkt_header;
1240 sp->pkt_hdr.eh.ether_type
1241 = ETHERTYPE_PPPOE_STUPID_SESS;
1243 sp->pkt_hdr.eh.ether_type
1244 = ETHERTYPE_PPPOE_SESS;
1245 sp->pkt_hdr.ph.code = 0;
1247 FREE(sp->neg, M_NETGRAPH_PPPOE);
1249 pppoe_send_event(sp, NGM_PPPOE_SUCCESS);
1253 * Send a 'close' message to the controlling
1254 * process (the one that set us up);
1255 * And then tear everything down.
1257 * Find matching peer/session combination.
1259 sendhook = pppoe_findsession(node, wh);
1260 if (sendhook == NULL) {
1263 /* send message to creator */
1266 ng_rmhook_self(sendhook);
1270 LEAVE(EPFNOSUPPORT);
1273 case ETHERTYPE_PPPOE_STUPID_SESS:
1274 case ETHERTYPE_PPPOE_SESS:
1276 * find matching peer/session combination.
1278 sendhook = pppoe_findsession(node, wh);
1279 if (sendhook == NULL) {
1280 LEAVE (ENETUNREACH);
1283 sp = NG_HOOK_PRIVATE(sendhook);
1284 m_adj(m, sizeof(*wh));
1285 if (m->m_pkthdr.len < length) {
1286 /* Packet too short, dump it */
1290 /* Also need to trim excess at the end */
1291 if (m->m_pkthdr.len > length) {
1292 m_adj(m, -((int)(m->m_pkthdr.len - length)));
1294 if ( sp->state != PPPOE_CONNECTED) {
1295 if (sp->state == PPPOE_NEWCONNECTED) {
1296 sp->state = PPPOE_CONNECTED;
1298 * Now we have gone to Connected mode,
1299 * Free all resources needed for
1300 * negotiation. Be paranoid about
1301 * whether there may be a timeout.
1303 m_freem(sp->neg->m);
1304 untimeout(pppoe_ticker, sendhook,
1305 sp->neg->timeout_handle);
1306 FREE(sp->neg, M_NETGRAPH_PPPOE);
1309 LEAVE (ENETUNREACH);
1313 NG_FWD_NEW_DATA( error, item, sendhook, m);
1316 LEAVE(EPFNOSUPPORT);
1320 * Not ethernet or debug hook..
1322 * The packet has come in on a normal hook.
1323 * We need to find out what kind of hook,
1324 * So we can decide how to handle it.
1325 * Check the hook's state.
1327 sp = NG_HOOK_PRIVATE(hook);
1328 switch (sp->state) {
1329 case PPPOE_NEWCONNECTED:
1330 case PPPOE_CONNECTED: {
1331 static const u_char addrctrl[] = { 0xff, 0x03 };
1332 struct pppoe_full_hdr *wh;
1335 * Remove PPP address and control fields, if any.
1336 * For example, ng_ppp(4) always sends LCP packets
1337 * with address and control fields as required by
1338 * generic PPP. PPPoE is an exception to the rule.
1340 if (m->m_pkthdr.len >= 2) {
1341 if (m->m_len < 2 && !(m = m_pullup(m, 2)))
1343 if (bcmp(mtod(m, u_char *), addrctrl, 2) == 0)
1347 * Bang in a pre-made header, and set the length up
1348 * to be correct. Then send it to the ethernet driver.
1349 * But first correct the length.
1351 sp->pkt_hdr.ph.length = htons((short)(m->m_pkthdr.len));
1352 M_PREPEND(m, sizeof(*wh), M_DONTWAIT);
1356 wh = mtod(m, struct pppoe_full_hdr *);
1357 bcopy(&sp->pkt_hdr, wh, sizeof(*wh));
1358 NG_FWD_NEW_DATA( error, item, privp->ethernet_hook, m);
1359 privp->packets_out++;
1364 * A PADI packet is being returned by the application
1365 * that has set up this hook. This indicates that it
1366 * wants us to offer service.
1369 if (m->m_len < sizeof(*wh)) {
1370 m = m_pullup(m, sizeof(*wh));
1375 wh = mtod(m, struct pppoe_full_hdr *);
1377 session = ntohs(wh->ph.sid);
1378 length = ntohs(wh->ph.length);
1380 if ( code != PADI_CODE) {
1383 untimeout(pppoe_ticker, hook,
1384 neg->timeout_handle);
1387 * This is the first time we hear
1388 * from the client, so note it's
1389 * unicast address, replacing the
1390 * broadcast address.
1392 bcopy(wh->eh.ether_shost,
1393 neg->pkt->pkt_header.eh.ether_dhost,
1395 sp->state = PPPOE_SOFFER;
1397 neg->pkt->pkt_header.ph.code = PADO_CODE;
1400 * start working out the tags to respond with.
1402 uniqtag.hdr.tag_type = PTT_AC_COOKIE;
1403 uniqtag.hdr.tag_len = htons((u_int16_t)sizeof(sp));
1404 uniqtag.data.pointer = sp;
1406 insert_tag(sp, &neg->ac_name.hdr); /* AC_NAME */
1407 if ((tag = get_tag(ph, PTT_SRV_NAME)))
1408 insert_tag(sp, tag); /* return service */
1410 * If we have a NULL service request
1411 * and have an extra service defined in this hook,
1412 * then also add a tag for the extra service.
1413 * XXX this is a hack. eventually we should be able
1414 * to support advertising many services, not just one
1416 if (((tag == NULL) || (tag->tag_len == 0))
1417 && (neg->service.hdr.tag_len != 0)) {
1418 insert_tag(sp, &neg->service.hdr); /* SERVICE */
1420 if ((tag = get_tag(ph, PTT_HOST_UNIQ)))
1421 insert_tag(sp, tag); /* returned hostunique */
1422 insert_tag(sp, &uniqtag.hdr);
1429 * Packets coming from the hook make no sense
1430 * to sessions in these states. Throw them away.
1436 case PPPOE_LISTENING:
1450 * Do local shutdown processing..
1451 * If we are a persistant device, we might refuse to go away, and
1452 * we'd only remove our links and reset ourself.
1455 ng_pppoe_shutdown(node_p node)
1457 const priv_p privdata = NG_NODE_PRIVATE(node);
1460 NG_NODE_SET_PRIVATE(node, NULL);
1461 NG_NODE_UNREF(privdata->node);
1462 FREE(privdata, M_NETGRAPH_PPPOE);
1467 * This is called once we've already connected a new hook to the other node.
1468 * It gives us a chance to balk at the last minute.
1471 ng_pppoe_connect(hook_p hook)
1473 /* be really amiable and just say "YUP that's OK by me! " */
1478 * Hook disconnection
1480 * Clean up all dangling links and information about the session/hook.
1481 * For this type, removal of the last link destroys the node
1484 ng_pppoe_disconnect(hook_p hook)
1486 node_p node = NG_HOOK_NODE(hook);
1487 priv_p privp = NG_NODE_PRIVATE(node);
1492 hooks = NG_NODE_NUMHOOKS(node); /* this one already not counted */
1493 if (NG_HOOK_PRIVATE(hook) == &privp->debug_hook) {
1494 privp->debug_hook = NULL;
1495 } else if (NG_HOOK_PRIVATE(hook) == &privp->ethernet_hook) {
1496 privp->ethernet_hook = NULL;
1497 if (NG_NODE_IS_VALID(node))
1498 ng_rmnode_self(node);
1500 sp = NG_HOOK_PRIVATE(hook);
1501 if (sp->state != PPPOE_SNONE ) {
1502 pppoe_send_event(sp, NGM_PPPOE_CLOSE);
1505 * According to the spec, if we are connected,
1506 * we should send a DISC packet if we are shutting down
1509 if ((privp->ethernet_hook)
1510 && ((sp->state == PPPOE_CONNECTED)
1511 || (sp->state == PPPOE_NEWCONNECTED))) {
1513 struct pppoe_full_hdr *wh;
1514 struct pppoe_tag *tag;
1515 int msglen = strlen(SIGNOFF);
1518 /* revert the stored header to DISC/PADT mode */
1520 wh->ph.code = PADT_CODE;
1522 wh->eh.ether_type = ETHERTYPE_PPPOE_STUPID_DISC;
1524 wh->eh.ether_type = ETHERTYPE_PPPOE_DISC;
1526 /* generate a packet of that type */
1527 MGETHDR(m, M_DONTWAIT, MT_DATA);
1529 printf("pppoe: Session out of mbufs\n");
1531 m->m_pkthdr.rcvif = NULL;
1532 m->m_pkthdr.len = m->m_len = sizeof(*wh);
1533 bcopy((caddr_t)wh, mtod(m, caddr_t),
1536 * Add a General error message and adjust
1539 wh = mtod(m, struct pppoe_full_hdr *);
1541 tag->tag_type = PTT_GEN_ERR;
1542 tag->tag_len = htons((u_int16_t)msglen);
1543 strncpy(tag->tag_data, SIGNOFF, msglen);
1544 m->m_pkthdr.len = (m->m_len += sizeof(*tag) +
1546 wh->ph.length = htons(sizeof(*tag) + msglen);
1547 NG_SEND_DATA_ONLY(error,
1548 privp->ethernet_hook, m);
1552 * As long as we have somewhere to store the timeout handle,
1553 * we may have a timeout pending.. get rid of it.
1556 untimeout(pppoe_ticker, hook, sp->neg->timeout_handle);
1558 m_freem(sp->neg->m);
1559 FREE(sp->neg, M_NETGRAPH_PPPOE);
1561 FREE(sp, M_NETGRAPH_PPPOE);
1562 NG_HOOK_SET_PRIVATE(hook, NULL);
1563 /* work out how many session hooks there are */
1564 /* Node goes away on last session hook removal */
1565 if (privp->ethernet_hook) hooks -= 1;
1566 if (privp->debug_hook) hooks -= 1;
1568 if ((NG_NODE_NUMHOOKS(node) == 0)
1569 && (NG_NODE_IS_VALID(node)))
1570 ng_rmnode_self(node);
1575 * timeouts come here.
1578 pppoe_ticker(void *arg)
1582 sessp sp = NG_HOOK_PRIVATE(hook);
1585 struct mbuf *m0 = NULL;
1586 priv_p privp = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
1591 * resend the last packet, using an exponential backoff.
1592 * After a period of time, stop growing the backoff,
1593 * and either leave it, or revert to the start.
1597 /* timeouts on these produce resends */
1598 m0 = m_copypacket(sp->neg->m, M_DONTWAIT);
1599 NG_SEND_DATA_ONLY( error, privp->ethernet_hook, m0);
1600 neg->timeout_handle = timeout(pppoe_ticker,
1601 hook, neg->timeout * hz);
1602 if ((neg->timeout <<= 1) > PPPOE_TIMEOUT_LIMIT) {
1603 if (sp->state == PPPOE_SREQ) {
1604 /* revert to SINIT mode */
1607 neg->timeout = PPPOE_TIMEOUT_LIMIT;
1613 /* a timeout on these says "give up" */
1614 ng_rmhook_self(hook);
1617 /* timeouts have no meaning in other states */
1618 printf("pppoe: unexpected timeout\n");
1625 sendpacket(sessp sp)
1628 struct mbuf *m0 = NULL;
1629 hook_p hook = sp->hook;
1631 priv_p privp = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
1635 case PPPOE_LISTENING:
1638 case PPPOE_CONNECTED:
1639 printf("pppoe: sendpacket: unexpected state\n");
1642 case PPPOE_NEWCONNECTED:
1643 /* send the PADS without a timeout - we're now connected */
1644 m0 = m_copypacket(sp->neg->m, M_DONTWAIT);
1645 NG_SEND_DATA_ONLY( error, privp->ethernet_hook, m0);
1649 /* No packet to send, but set up the timeout */
1650 neg->timeout_handle = timeout(pppoe_ticker,
1651 hook, PPPOE_OFFER_TIMEOUT * hz);
1656 * send the offer but if they don't respond
1657 * in PPPOE_OFFER_TIMEOUT seconds, forget about it.
1659 m0 = m_copypacket(sp->neg->m, M_DONTWAIT);
1660 NG_SEND_DATA_ONLY( error, privp->ethernet_hook, m0);
1661 neg->timeout_handle = timeout(pppoe_ticker,
1662 hook, PPPOE_OFFER_TIMEOUT * hz);
1667 m0 = m_copypacket(sp->neg->m, M_DONTWAIT);
1668 NG_SEND_DATA_ONLY( error, privp->ethernet_hook, m0);
1669 neg->timeout_handle = timeout(pppoe_ticker, hook,
1670 (hz * PPPOE_INITIAL_TIMEOUT));
1671 neg->timeout = PPPOE_INITIAL_TIMEOUT * 2;
1676 printf("pppoe: timeout: bad state\n");
1678 /* return (error); */
1682 * Parse an incoming packet to see if any tags should be copied to the
1683 * output packet. Don't do any tags that have been handled in the main
1686 static const struct pppoe_tag*
1687 scan_tags(sessp sp, const struct pppoe_hdr* ph)
1689 const char *const end = (const char *)next_tag(ph);
1691 const struct pppoe_tag *pt = &ph->tag[0];
1693 * Keep processing tags while a tag header will still fit.
1696 while((const char*)(pt + 1) <= end) {
1698 * If the tag data would go past the end of the packet, abort.
1700 ptn = (((const char *)(pt + 1)) + ntohs(pt->tag_len));
1704 switch (pt->tag_type) {
1720 pt = (const struct pppoe_tag*)ptn;
1726 pppoe_send_event(sessp sp, enum cmd cmdid)
1729 struct ng_mesg *msg;
1730 struct ngpppoe_sts *sts;
1733 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, cmdid,
1734 sizeof(struct ngpppoe_sts), M_NOWAIT);
1737 sts = (struct ngpppoe_sts *)msg->data;
1738 strncpy(sts->hook, NG_HOOK_NAME(sp->hook), NG_HOOKLEN + 1);
1739 NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, NULL);