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 *
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39 * $FreeBSD: head/sys/netgraph/ng_pppoe.c 68876 2000-11-18 15:17:43Z dwmalone $
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39 * $FreeBSD: head/sys/netgraph/ng_pppoe.c 69922 2000-12-12 18:52:14Z julian $ |
40 * $Whistle: ng_pppoe.c,v 1.10 1999/11/01 09:24:52 julian Exp $ 41 */ 42#if 0 43#define AAA printf("pppoe: %s\n", __FUNCTION__ ); 44#define BBB printf("-%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 <net/ethernet.h> 57 58#include <netgraph/ng_message.h> 59#include <netgraph/netgraph.h> 60#include <netgraph/ng_parse.h> 61#include <netgraph/ng_pppoe.h> 62 63#define SIGNOFF "session closed" 64#define OFFSETOF(s, e) ((char *)&((s *)0)->e - (char *)((s *)0)) 65 66/* 67 * This section contains the netgraph method declarations for the 68 * sample node. These methods define the netgraph 'type'. 69 */ 70 71static ng_constructor_t ng_pppoe_constructor; 72static ng_rcvmsg_t ng_pppoe_rcvmsg; 73static ng_shutdown_t ng_pppoe_rmnode; 74static ng_newhook_t ng_pppoe_newhook; 75static ng_connect_t ng_pppoe_connect; 76static ng_rcvdata_t ng_pppoe_rcvdata; 77static ng_disconnect_t ng_pppoe_disconnect; 78 79/* Parse type for struct ngpppoe_init_data */ 80static const struct ng_parse_struct_info ngpppoe_init_data_type_info 81 = NG_PPPOE_INIT_DATA_TYPE_INFO; 82static const struct ng_parse_type ngpppoe_init_data_state_type = { 83 &ng_parse_struct_type, 84 &ngpppoe_init_data_type_info 85}; 86 87/* Parse type for struct ngpppoe_sts */ 88static const struct ng_parse_struct_info ng_pppoe_sts_type_info 89 = NG_PPPOE_STS_TYPE_INFO; 90static const struct ng_parse_type ng_pppoe_sts_state_type = { 91 &ng_parse_struct_type, 92 &ng_pppoe_sts_type_info 93}; 94 95/* List of commands and how to convert arguments to/from ASCII */ 96static const struct ng_cmdlist ng_pppoe_cmds[] = { 97 { 98 NGM_PPPOE_COOKIE, 99 NGM_PPPOE_CONNECT, 100 "pppoe_connect", 101 &ngpppoe_init_data_state_type, 102 NULL 103 }, 104 { 105 NGM_PPPOE_COOKIE, 106 NGM_PPPOE_LISTEN, 107 "pppoe_listen", 108 &ngpppoe_init_data_state_type, 109 NULL 110 }, 111 { 112 NGM_PPPOE_COOKIE, 113 NGM_PPPOE_OFFER, 114 "pppoe_offer", 115 &ngpppoe_init_data_state_type, 116 NULL 117 }, 118 { 119 NGM_PPPOE_COOKIE,
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120 NGM_PPPOE_SERVICE, 121 "pppoe_service", 122 &ngpppoe_init_data_state_type, 123 NULL 124 }, 125 { 126 NGM_PPPOE_COOKIE, |
127 NGM_PPPOE_SUCCESS, 128 "pppoe_success", 129 &ng_pppoe_sts_state_type, 130 NULL 131 }, 132 { 133 NGM_PPPOE_COOKIE, 134 NGM_PPPOE_FAIL, 135 "pppoe_fail", 136 &ng_pppoe_sts_state_type, 137 NULL 138 }, 139 { 140 NGM_PPPOE_COOKIE, 141 NGM_PPPOE_CLOSE, 142 "pppoe_close", 143 &ng_pppoe_sts_state_type, 144 NULL 145 }, 146 { 0 } 147}; 148 149/* Netgraph node type descriptor */ 150static struct ng_type typestruct = { 151 NG_VERSION, 152 NG_PPPOE_NODE_TYPE, 153 NULL, 154 ng_pppoe_constructor, 155 ng_pppoe_rcvmsg, 156 ng_pppoe_rmnode, 157 ng_pppoe_newhook, 158 NULL, 159 ng_pppoe_connect, 160 ng_pppoe_rcvdata,
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154 ng_pppoe_rcvdata,
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161 ng_pppoe_disconnect, 162 ng_pppoe_cmds 163}; 164NETGRAPH_INIT(pppoe, &typestruct); 165 166/* 167 * States for the session state machine. 168 * These have no meaning if there is no hook attached yet. 169 */ 170enum state { 171 PPPOE_SNONE=0, /* [both] Initial state */ 172 PPPOE_LISTENING, /* [Daemon] Listening for discover initiation pkt */ 173 PPPOE_SINIT, /* [Client] Sent discovery initiation */ 174 PPPOE_PRIMED, /* [Server] Awaiting PADI from daemon */ 175 PPPOE_SOFFER, /* [Server] Sent offer message (got PADI)*/ 176 PPPOE_SREQ, /* [Client] Sent a Request */ 177 PPPOE_NEWCONNECTED, /* [Server] Connection established, No data received */ 178 PPPOE_CONNECTED, /* [Both] Connection established, Data received */ 179 PPPOE_DEAD /* [Both] */ 180}; 181 182#define NUMTAGS 20 /* number of tags we are set up to work with */ 183 184/* 185 * Information we store for each hook on each node for negotiating the 186 * session. The mbuf and cluster are freed once negotiation has completed. 187 * The whole negotiation block is then discarded. 188 */ 189 190struct sess_neg { 191 struct mbuf *m; /* holds cluster with last sent packet */ 192 union packet *pkt; /* points within the above cluster */ 193 struct callout_handle timeout_handle; /* see timeout(9) */ 194 u_int timeout; /* 0,1,2,4,8,16 etc. seconds */ 195 u_int numtags; 196 struct pppoe_tag *tags[NUMTAGS]; 197 u_int service_len; 198 u_int ac_name_len; 199 200 struct datatag service; 201 struct datatag ac_name; 202}; 203typedef struct sess_neg *negp; 204 205/* 206 * Session information that is needed after connection. 207 */ 208struct sess_con { 209 hook_p hook; 210 u_int16_t Session_ID; 211 enum state state; 212 char creator[NG_NODELEN + 1]; /* who to notify */ 213 struct pppoe_full_hdr pkt_hdr; /* used when connected */ 214 negp neg; /* used when negotiating */ 215 /*struct sess_con *hash_next;*/ /* not yet used */ 216}; 217typedef struct sess_con *sessp; 218 219/* 220 * Information we store for each node 221 */ 222struct PPPOE { 223 node_p node; /* back pointer to node */ 224 hook_p ethernet_hook; 225 hook_p debug_hook; 226 u_int packets_in; /* packets in from ethernet */ 227 u_int packets_out; /* packets out towards ethernet */ 228 u_int32_t flags; 229 /*struct sess_con *buckets[HASH_SIZE];*/ /* not yet used */ 230}; 231typedef struct PPPOE *priv_p; 232 233const struct ether_header eh_prototype = 234 {{0xff,0xff,0xff,0xff,0xff,0xff}, 235 {0x00,0x00,0x00,0x00,0x00,0x00}, 236 ETHERTYPE_PPPOE_DISC}; 237 238union uniq { 239 char bytes[sizeof(void *)]; 240 void * pointer; 241 }; 242 243#define LEAVE(x) do { error = x; goto quit; } while(0) 244static void pppoe_start(sessp sp); 245static void sendpacket(sessp sp); 246static void pppoe_ticker(void *arg); 247static struct pppoe_tag* scan_tags(sessp sp, struct pppoe_hdr* ph); 248static int pppoe_send_event(sessp sp, enum cmd cmdid); 249 250/************************************************************************* 251 * Some basic utilities from the Linux version with author's permission.* 252 * Author: Michal Ostrowski <mostrows@styx.uwaterloo.ca> * 253 ************************************************************************/ 254 255/* 256 * Generate a new session id 257 * XXX find out the FreeBSD locking scheme. 258 */ 259static u_int16_t 260get_new_sid(node_p node) 261{ 262 static int pppoe_sid = 10; 263 sessp sp; 264 hook_p hook; 265 u_int16_t val; 266 priv_p privp = node->private; 267 268AAA 269restart: 270 val = pppoe_sid++; 271 /* 272 * Spec says 0xFFFF is reserved. 273 * Also don't use 0x0000 274 */ 275 if (val == 0xffff) { 276 pppoe_sid = 20; 277 goto restart; 278 } 279 280 /* Check it isn't already in use */ 281 LIST_FOREACH(hook, &node->hooks, hooks) { 282 /* don't check special hooks */ 283 if ((hook->private == &privp->debug_hook) 284 || (hook->private == &privp->ethernet_hook)) 285 continue; 286 sp = hook->private; 287 if (sp->Session_ID == val) 288 goto restart; 289 } 290 291 return val; 292} 293 294 295/* 296 * Return the location where the next tag can be put 297 */ 298static __inline struct pppoe_tag* 299next_tag(struct pppoe_hdr* ph) 300{ 301 return (struct pppoe_tag*)(((char*)&ph->tag[0]) + ntohs(ph->length)); 302} 303 304/* 305 * Look for a tag of a specific type 306 * Don't trust any length the other end says. 307 * but assume we already sanity checked ph->length. 308 */ 309static struct pppoe_tag* 310get_tag(struct pppoe_hdr* ph, u_int16_t idx) 311{ 312 char *end = (char *)next_tag(ph); 313 char *ptn; 314 struct pppoe_tag *pt = &ph->tag[0]; 315 /* 316 * Keep processing tags while a tag header will still fit. 317 */ 318AAA 319 while((char*)(pt + 1) <= end) { 320 /* 321 * If the tag data would go past the end of the packet, abort. 322 */ 323 ptn = (((char *)(pt + 1)) + ntohs(pt->tag_len)); 324 if(ptn > end) 325 return NULL; 326 327 if(pt->tag_type == idx) 328 return pt; 329 330 pt = (struct pppoe_tag*)ptn; 331 } 332 return NULL; 333} 334 335/************************************************************************** 336 * inlines to initialise or add tags to a session's tag list, 337 **************************************************************************/ 338/* 339 * Initialise the session's tag list 340 */ 341static void 342init_tags(sessp sp) 343{ 344AAA 345 if(sp->neg == NULL) { 346 printf("pppoe: asked to init NULL neg pointer\n"); 347 return; 348 } 349 sp->neg->numtags = 0; 350} 351 352static void 353insert_tag(sessp sp, struct pppoe_tag *tp) 354{ 355 int i; 356 negp neg; 357 358AAA 359 if((neg = sp->neg) == NULL) { 360 printf("pppoe: asked to use NULL neg pointer\n"); 361 return; 362 } 363 if ((i = neg->numtags++) < NUMTAGS) { 364 neg->tags[i] = tp; 365 } else { 366 printf("pppoe: asked to add too many tags to packet\n"); 367 neg->numtags--; 368 } 369} 370 371/* 372 * Make up a packet, using the tags filled out for the session. 373 * 374 * Assume that the actual pppoe header and ethernet header 375 * are filled out externally to this routine. 376 * Also assume that neg->wh points to the correct 377 * location at the front of the buffer space. 378 */ 379static void 380make_packet(sessp sp) { 381 struct pppoe_full_hdr *wh = &sp->neg->pkt->pkt_header; 382 struct pppoe_tag **tag; 383 char *dp; 384 int count; 385 int tlen; 386 u_int16_t length = 0; 387 388AAA 389 if ((sp->neg == NULL) || (sp->neg->m == NULL)) { 390 printf("pppoe: make_packet called from wrong state\n"); 391 } 392 dp = (char *)wh->ph.tag; 393 for (count = 0, tag = sp->neg->tags; 394 ((count < sp->neg->numtags) && (count < NUMTAGS)); 395 tag++, count++) { 396 tlen = ntohs((*tag)->tag_len) + sizeof(**tag); 397 if ((length + tlen) > (ETHER_MAX_LEN - 4 - sizeof(*wh))) { 398 printf("pppoe: tags too long\n"); 399 sp->neg->numtags = count; 400 break; /* XXX chop off what's too long */ 401 } 402 bcopy((char *)*tag, (char *)dp, tlen); 403 length += tlen; 404 dp += tlen; 405 } 406 wh->ph.length = htons(length); 407 sp->neg->m->m_len = length + sizeof(*wh); 408 sp->neg->m->m_pkthdr.len = length + sizeof(*wh); 409} 410 411/************************************************************************** 412 * Routine to match a service offered * 413 **************************************************************************/ 414/* 415 * Find a hook that has a service string that matches that 416 * we are seeking. for now use a simple string. 417 * In the future we may need something like regexp(). 418 * for testing allow a null string to match 1st found and a null service 419 * to match all requests. Also make '*' do the same. 420 */ 421static hook_p 422pppoe_match_svc(node_p node, char *svc_name, int svc_len) 423{ 424 sessp sp = NULL; 425 negp neg = NULL; 426 priv_p privp = node->private; 427 hook_p hook; 428 429AAA 430 LIST_FOREACH(hook, &node->hooks, hooks) { 431 432 /* skip any hook that is debug or ethernet */ 433 if ((hook->private == &privp->debug_hook) 434 || (hook->private == &privp->ethernet_hook)) 435 continue; 436 sp = hook->private; 437 438 /* Skip any sessions which are not in LISTEN mode. */ 439 if ( sp->state != PPPOE_LISTENING) 440 continue; 441 442 neg = sp->neg; 443 /* XXX check validity of this */ 444 /* special case, NULL request. match 1st found. */ 445 if (svc_len == 0) 446 break; 447 448 /* XXX check validity of this */ 449 /* Special case for a blank or "*" service name (wildcard) */ 450 if ((neg->service_len == 0) 451 || ((neg->service_len == 1) 452 && (neg->service.data[0] == '*'))) { 453 break; 454 } 455 456 /* If the lengths don't match, that aint it. */ 457 if (neg->service_len != svc_len) 458 continue; 459 460 /* An exact match? */ 461 if (strncmp(svc_name, neg->service.data, svc_len) == 0) 462 break; 463 } 464 return (hook); 465} 466/************************************************************************** 467 * Routine to find a particular session that matches an incoming packet * 468 **************************************************************************/ 469static hook_p 470pppoe_findsession(node_p node, struct pppoe_full_hdr *wh) 471{ 472 sessp sp = NULL; 473 hook_p hook = NULL; 474 priv_p privp = node->private; 475 u_int16_t session = ntohs(wh->ph.sid); 476 477 /* 478 * find matching peer/session combination. 479 */ 480AAA 481 LIST_FOREACH(hook, &node->hooks, hooks) { 482 /* don't check special hooks */ 483 if ((hook->private == &privp->debug_hook) 484 || (hook->private == &privp->ethernet_hook)) { 485 continue; 486 } 487 sp = hook->private; 488 if ( ( (sp->state == PPPOE_CONNECTED) 489 || (sp->state == PPPOE_NEWCONNECTED) ) 490 && (sp->Session_ID == session) 491 && (bcmp(sp->pkt_hdr.eh.ether_dhost, 492 wh->eh.ether_shost, 493 ETHER_ADDR_LEN)) == 0) { 494 break; 495 } 496 } 497 return (hook); 498} 499 500static hook_p 501pppoe_finduniq(node_p node, struct pppoe_tag *tag) 502{ 503 hook_p hook = NULL; 504 priv_p privp = node->private; 505 union uniq uniq; 506 507AAA 508 bcopy(tag->tag_data, uniq.bytes, sizeof(void *)); 509 /* cycle through all known hooks */ 510 LIST_FOREACH(hook, &node->hooks, hooks) { 511 /* don't check special hooks */ 512 if ((hook->private == &privp->debug_hook) 513 || (hook->private == &privp->ethernet_hook)) 514 continue; 515 if (uniq.pointer == hook->private) 516 break; 517 } 518 return (hook); 519} 520 521/************************************************************************** 522 * start of Netgraph entrypoints * 523 **************************************************************************/ 524 525/* 526 * Allocate the private data structure and the generic node 527 * and link them together. 528 * 529 * ng_make_node_common() returns with a generic node struct 530 * with a single reference for us.. we transfer it to the 531 * private structure.. when we free the private struct we must 532 * unref the node so it gets freed too.
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527 *
528 * If this were a device node than this work would be done in the attach()
529 * routine and the constructor would return EINVAL as you should not be able
530 * to creatednodes that depend on hardware (unless you can add the hardware :)
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533 */ 534static int 535ng_pppoe_constructor(node_p *nodep) 536{ 537 priv_p privdata; 538 int error; 539 540AAA 541 /* Initialize private descriptor */ 542 MALLOC(privdata, priv_p, sizeof(*privdata), M_NETGRAPH, 543 M_NOWAIT | M_ZERO); 544 if (privdata == NULL) 545 return (ENOMEM); 546 547 /* Call the 'generic' (ie, superclass) node constructor */ 548 if ((error = ng_make_node_common(&typestruct, nodep))) { 549 FREE(privdata, M_NETGRAPH); 550 return (error); 551 } 552 553 /* Link structs together; this counts as our one reference to *nodep */ 554 (*nodep)->private = privdata; 555 privdata->node = *nodep; 556 return (0); 557} 558 559/* 560 * Give our ok for a hook to be added... 561 * point the hook's private info to the hook structure. 562 * 563 * The following hook names are special: 564 * Ethernet: the hook that should be connected to a NIC. 565 * debug: copies of data sent out here (when I write the code).
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566 * All other hook names need only be unique. (the framework checks this). |
567 */ 568static int 569ng_pppoe_newhook(node_p node, hook_p hook, const char *name) 570{ 571 const priv_p privp = node->private; 572 sessp sp; 573 574AAA 575 if (strcmp(name, NG_PPPOE_HOOK_ETHERNET) == 0) { 576 privp->ethernet_hook = hook; 577 hook->private = &privp->ethernet_hook; 578 } else if (strcmp(name, NG_PPPOE_HOOK_DEBUG) == 0) { 579 privp->debug_hook = hook; 580 hook->private = &privp->debug_hook; 581 } else { 582 /* 583 * Any other unique name is OK. 584 * The infrastructure has already checked that it's unique, 585 * so just allocate it and hook it in. 586 */ 587 MALLOC(sp, sessp, sizeof(*sp), M_NETGRAPH, M_NOWAIT | M_ZERO); 588 if (sp == NULL) { 589 return (ENOMEM); 590 } 591 592 hook->private = sp; 593 sp->hook = hook; 594 } 595 return(0); 596} 597 598/* 599 * Get a netgraph control message. 600 * Check it is one we understand. If needed, send a response. 601 * We sometimes save the address for an async action later. 602 * Always free the message. 603 */ 604static int 605ng_pppoe_rcvmsg(node_p node, struct ng_mesg *msg, const char *retaddr, 606 struct ng_mesg **rptr, hook_p lasthook) 607{ 608 priv_p privp = node->private; 609 struct ngpppoe_init_data *ourmsg = NULL; 610 struct ng_mesg *resp = NULL; 611 int error = 0; 612 hook_p hook = NULL; 613 sessp sp = NULL; 614 negp neg = NULL; 615 616AAA 617 /* Deal with message according to cookie and command */ 618 switch (msg->header.typecookie) { 619 case NGM_PPPOE_COOKIE: 620 switch (msg->header.cmd) { 621 case NGM_PPPOE_CONNECT: 622 case NGM_PPPOE_LISTEN: 623 case NGM_PPPOE_OFFER:
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624 case NGM_PPPOE_SERVICE: |
625 ourmsg = (struct ngpppoe_init_data *)msg->data; 626 if (msg->header.arglen < sizeof(*ourmsg)) { 627 printf("pppoe: init data too small\n"); 628 LEAVE(EMSGSIZE); 629 } 630 if (msg->header.arglen - sizeof(*ourmsg) > 631 PPPOE_SERVICE_NAME_SIZE) { 632 printf("pppoe_rcvmsg: service name too big"); 633 LEAVE(EMSGSIZE); 634 } 635 if (msg->header.arglen - sizeof(*ourmsg) < 636 ourmsg->data_len) { 637 printf("pppoe: init data has bad length," 638 " %d should be %d\n", ourmsg->data_len, 639 msg->header.arglen - sizeof (*ourmsg)); 640 LEAVE(EMSGSIZE); 641 } 642 643 /* make sure strcmp will terminate safely */ 644 ourmsg->hook[sizeof(ourmsg->hook) - 1] = '\0'; 645 646 /* cycle through all known hooks */ 647 LIST_FOREACH(hook, &node->hooks, hooks) { 648 if (hook->name 649 && strcmp(hook->name, ourmsg->hook) == 0) 650 break; 651 } 652 if (hook == NULL) { 653 LEAVE(ENOENT); 654 } 655 if ((hook->private == &privp->debug_hook) 656 || (hook->private == &privp->ethernet_hook)) { 657 LEAVE(EINVAL); 658 } 659 sp = hook->private;
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660 661 /* 662 * PPPOE_SERVICE advertisments are set up 663 * on sessions that are in PRIMED state. 664 */ 665 if (msg->header.cmd == NGM_PPPOE_SERVICE) { 666 break; 667 } |
668 if (sp->state |= PPPOE_SNONE) { 669 printf("pppoe: Session already active\n"); 670 LEAVE(EISCONN); 671 } 672 673 /* 674 * set up prototype header 675 */ 676 MALLOC(neg, negp, sizeof(*neg), M_NETGRAPH, 677 M_NOWAIT | M_ZERO); 678 679 if (neg == NULL) { 680 printf("pppoe: Session out of memory\n"); 681 LEAVE(ENOMEM); 682 } 683 MGETHDR(neg->m, M_DONTWAIT, MT_DATA); 684 if(neg->m == NULL) { 685 printf("pppoe: Session out of mbufs\n"); 686 FREE(neg, M_NETGRAPH); 687 LEAVE(ENOBUFS); 688 } 689 neg->m->m_pkthdr.rcvif = NULL; 690 MCLGET(neg->m, M_DONTWAIT); 691 if ((neg->m->m_flags & M_EXT) == 0) { 692 printf("pppoe: Session out of mcls\n"); 693 m_freem(neg->m); 694 FREE(neg, M_NETGRAPH); 695 LEAVE(ENOBUFS); 696 } 697 sp->neg = neg; 698 callout_handle_init( &neg->timeout_handle); 699 neg->m->m_len = sizeof(struct pppoe_full_hdr); 700 neg->pkt = mtod(neg->m, union packet*); 701 neg->pkt->pkt_header.eh = eh_prototype; 702 neg->pkt->pkt_header.ph.ver = 0x1; 703 neg->pkt->pkt_header.ph.type = 0x1; 704 neg->pkt->pkt_header.ph.sid = 0x0000; 705 neg->timeout = 0; 706 707 strncpy(sp->creator, retaddr, NG_NODELEN); 708 sp->creator[NG_NODELEN] = '\0'; 709 } 710 switch (msg->header.cmd) { 711 case NGM_PPPOE_GET_STATUS: 712 { 713 struct ngpppoestat *stats; 714 715 NG_MKRESPONSE(resp, msg, sizeof(*stats), M_NOWAIT); 716 if (!resp) { 717 LEAVE(ENOMEM); 718 } 719 stats = (struct ngpppoestat *) resp->data; 720 stats->packets_in = privp->packets_in; 721 stats->packets_out = privp->packets_out; 722 break; 723 } 724 case NGM_PPPOE_CONNECT: 725 /* 726 * Check the hook exists and is Uninitialised. 727 * Send a PADI request, and start the timeout logic. 728 * Store the originator of this message so we can send 729 * a success of fail message to them later. 730 * Move the session to SINIT 731 * Set up the session to the correct state and 732 * start it. 733 */ 734 neg->service.hdr.tag_type = PTT_SRV_NAME; 735 neg->service.hdr.tag_len = 736 htons((u_int16_t)ourmsg->data_len); 737 if (ourmsg->data_len) 738 bcopy(ourmsg->data, neg->service.data, 739 ourmsg->data_len); 740 neg->service_len = ourmsg->data_len; 741 pppoe_start(sp); 742 break; 743 case NGM_PPPOE_LISTEN: 744 /* 745 * Check the hook exists and is Uninitialised. 746 * Install the service matching string. 747 * Store the originator of this message so we can send 748 * a success of fail message to them later. 749 * Move the hook to 'LISTENING'
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738
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750 */ 751 neg->service.hdr.tag_type = PTT_SRV_NAME; 752 neg->service.hdr.tag_len = 753 htons((u_int16_t)ourmsg->data_len); 754 755 if (ourmsg->data_len) 756 bcopy(ourmsg->data, neg->service.data, 757 ourmsg->data_len); 758 neg->service_len = ourmsg->data_len; 759 neg->pkt->pkt_header.ph.code = PADT_CODE; 760 /* 761 * wait for PADI packet coming from ethernet 762 */ 763 sp->state = PPPOE_LISTENING; 764 break; 765 case NGM_PPPOE_OFFER: 766 /* 767 * Check the hook exists and is Uninitialised. 768 * Store the originator of this message so we can send 769 * a success of fail message to them later. 770 * Store the AC-Name given and go to PRIMED. 771 */ 772 neg->ac_name.hdr.tag_type = PTT_AC_NAME; 773 neg->ac_name.hdr.tag_len = 774 htons((u_int16_t)ourmsg->data_len); 775 if (ourmsg->data_len) 776 bcopy(ourmsg->data, neg->ac_name.data, 777 ourmsg->data_len); 778 neg->ac_name_len = ourmsg->data_len; 779 neg->pkt->pkt_header.ph.code = PADO_CODE; 780 /* 781 * Wait for PADI packet coming from hook 782 */ 783 sp->state = PPPOE_PRIMED; 784 break;
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785 case NGM_PPPOE_SERVICE: 786 /* 787 * Check the session is primed. 788 * for now just allow ONE service to be advertised. 789 * If you do it twice you just overwrite. 790 */ 791 if (sp->state |= PPPOE_PRIMED) { 792 printf("pppoe: Session not primed\n"); 793 LEAVE(EISCONN); 794 } 795 neg->service.hdr.tag_type = PTT_SRV_NAME; 796 neg->service.hdr.tag_len = 797 htons((u_int16_t)ourmsg->data_len); 798 799 if (ourmsg->data_len) 800 bcopy(ourmsg->data, neg->service.data, 801 ourmsg->data_len); 802 neg->service_len = ourmsg->data_len; 803 break; |
804 default: 805 LEAVE(EINVAL); 806 } 807 break; 808 default: 809 LEAVE(EINVAL); 810 } 811 812 /* Take care of synchronous response, if any */ 813 if (rptr) 814 *rptr = resp; 815 else if (resp) 816 FREE(resp, M_NETGRAPH); 817 818 /* Free the message and return */ 819quit: 820 FREE(msg, M_NETGRAPH); 821 return(error); 822} 823 824/* 825 * Start a client into the first state. A separate function because 826 * it can be needed if the negotiation times out. 827 */ 828static void 829pppoe_start(sessp sp) 830{ 831 struct { 832 struct pppoe_tag hdr; 833 union uniq data; 834 } uniqtag; 835 836 /* 837 * kick the state machine into starting up 838 */ 839AAA 840 sp->state = PPPOE_SINIT; 841 /* reset the packet header to broadcast */ 842 sp->neg->pkt->pkt_header.eh = eh_prototype; 843 sp->neg->pkt->pkt_header.ph.code = PADI_CODE; 844 uniqtag.hdr.tag_type = PTT_HOST_UNIQ; 845 uniqtag.hdr.tag_len = htons((u_int16_t)sizeof(uniqtag.data)); 846 uniqtag.data.pointer = sp; 847 init_tags(sp); 848 insert_tag(sp, &uniqtag.hdr); 849 insert_tag(sp, &sp->neg->service.hdr); 850 make_packet(sp); 851 sendpacket(sp); 852} 853 854/* 855 * Receive data, and do something with it. 856 * The caller will never free m or meta, so 857 * if we use up this data or abort we must free BOTH of these. 858 */ 859static int 860ng_pppoe_rcvdata(hook_p hook, struct mbuf *m, meta_p meta,
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831 struct mbuf **ret_m, meta_p *ret_meta)
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861 struct mbuf **ret_m, meta_p *ret_meta, struct ng_mesg **resp) |
862{ 863 node_p node = hook->node; 864 const priv_p privp = node->private; 865 sessp sp = hook->private; 866 struct pppoe_full_hdr *wh; 867 struct pppoe_hdr *ph; 868 int error = 0; 869 u_int16_t session; 870 u_int16_t length; 871 u_int8_t code; 872 struct pppoe_tag *utag = NULL, *tag = NULL; 873 hook_p sendhook; 874 struct { 875 struct pppoe_tag hdr; 876 union uniq data; 877 } uniqtag; 878 negp neg = NULL; 879 880AAA 881 if (hook->private == &privp->debug_hook) { 882 /* 883 * Data from the debug hook gets sent without modification 884 * straight to the ethernet. 885 */ 886 NG_SEND_DATA( error, privp->ethernet_hook, m, meta); 887 privp->packets_out++; 888 } else if (hook->private == &privp->ethernet_hook) { 889 /* 890 * Incoming data. 891 * Dig out various fields from the packet. 892 * use them to decide where to send it. 893 */ 894 895 privp->packets_in++; 896 if( m->m_len < sizeof(*wh)) { 897 m = m_pullup(m, sizeof(*wh)); /* Checks length */ 898 if (m == NULL) { 899 printf("couldn't m_pullup\n"); 900 LEAVE(ENOBUFS); 901 } 902 } 903 wh = mtod(m, struct pppoe_full_hdr *); 904 ph = &wh->ph; 905 session = ntohs(wh->ph.sid); 906 length = ntohs(wh->ph.length); 907 code = wh->ph.code; 908 switch(wh->eh.ether_type) { 909 case ETHERTYPE_PPPOE_DISC: 910 /* 911 * We need to try to make sure that the tag area 912 * is contiguous, or we could wander off the end 913 * of a buffer and make a mess. 914 * (Linux wouldn't have this problem). 915 */ 916/*XXX fix this mess */ 917 918 if (m->m_pkthdr.len <= MHLEN) { 919 if( m->m_len < m->m_pkthdr.len) { 920 m = m_pullup(m, m->m_pkthdr.len); 921 if (m == NULL) { 922 printf("couldn't m_pullup\n"); 923 LEAVE(ENOBUFS); 924 } 925 } 926 } 927 if (m->m_len != m->m_pkthdr.len) { 928 /* 929 * It's not all in one piece. 930 * We need to do extra work. 931 */ 932 printf("packet fragmented\n"); 933 LEAVE(EMSGSIZE); 934 } 935 936 switch(code) { 937 case PADI_CODE: 938 /* 939 * We are a server: 940 * Look for a hook with the required service 941 * and send the ENTIRE packet up there. 942 * It should come back to a new hook in 943 * PRIMED state. Look there for further 944 * processing. 945 */ 946 tag = get_tag(ph, PTT_SRV_NAME); 947 if (tag == NULL) { 948 printf("no service tag\n"); 949 LEAVE(ENETUNREACH); 950 } 951 sendhook = pppoe_match_svc(hook->node, 952 tag->tag_data, ntohs(tag->tag_len)); 953 if (sendhook) { 954 NG_SEND_DATA(error, sendhook, m, meta); 955 } else { 956 printf("no such service\n"); 957 LEAVE(ENETUNREACH); 958 } 959 break; 960 case PADO_CODE: 961 /* 962 * We are a client: 963 * Use the host_uniq tag to find the 964 * hook this is in response to. 965 * Received #2, now send #3 966 * For now simply accept the first we receive. 967 */ 968 utag = get_tag(ph, PTT_HOST_UNIQ); 969 if ((utag == NULL) 970 || (ntohs(utag->tag_len) != sizeof(sp))) { 971 printf("no host unique field\n"); 972 LEAVE(ENETUNREACH); 973 } 974 975 sendhook = pppoe_finduniq(node, utag); 976 if (sendhook == NULL) { 977 printf("no matching session\n"); 978 LEAVE(ENETUNREACH); 979 } 980 981 /* 982 * Check the session is in the right state. 983 * It needs to be in PPPOE_SINIT. 984 */ 985 sp = sendhook->private; 986 if (sp->state != PPPOE_SINIT) { 987 printf("session in wrong state\n"); 988 LEAVE(ENETUNREACH); 989 } 990 neg = sp->neg; 991 untimeout(pppoe_ticker, sendhook, 992 neg->timeout_handle); 993 994 /* 995 * This is the first time we hear 996 * from the server, so note it's 997 * unicast address, replacing the 998 * broadcast address . 999 */ 1000 bcopy(wh->eh.ether_shost, 1001 neg->pkt->pkt_header.eh.ether_dhost, 1002 ETHER_ADDR_LEN); 1003 neg->timeout = 0; 1004 neg->pkt->pkt_header.ph.code = PADR_CODE; 1005 init_tags(sp); 1006 insert_tag(sp, utag); /* Host Unique */ 1007 if ((tag = get_tag(ph, PTT_AC_COOKIE))) 1008 insert_tag(sp, tag); /* return cookie */ 1009 if ((tag = get_tag(ph, PTT_AC_NAME))) 1010 insert_tag(sp, tag); /* return it */ 1011 insert_tag(sp, &neg->service.hdr); /* Service */ 1012 scan_tags(sp, ph); 1013 make_packet(sp); 1014 sp->state = PPPOE_SREQ; 1015 sendpacket(sp); 1016 break; 1017 case PADR_CODE: 1018 1019 /* 1020 * We are a server: 1021 * Use the ac_cookie tag to find the 1022 * hook this is in response to. 1023 */ 1024 utag = get_tag(ph, PTT_AC_COOKIE); 1025 if ((utag == NULL) 1026 || (ntohs(utag->tag_len) != sizeof(sp))) { 1027 LEAVE(ENETUNREACH); 1028 } 1029 1030 sendhook = pppoe_finduniq(node, utag); 1031 if (sendhook == NULL) { 1032 LEAVE(ENETUNREACH); 1033 } 1034 1035 /* 1036 * Check the session is in the right state. 1037 * It needs to be in PPPOE_SOFFER 1038 * or PPPOE_NEWCONNECTED. If the latter, 1039 * then this is a retry by the client. 1040 * so be nice, and resend. 1041 */ 1042 sp = sendhook->private; 1043 if (sp->state == PPPOE_NEWCONNECTED) { 1044 /* 1045 * Whoa! drop back to resend that 1046 * PADS packet. 1047 * We should still have a copy of it. 1048 */ 1049 sp->state = PPPOE_SOFFER; 1050 } 1051 if (sp->state != PPPOE_SOFFER) { 1052 LEAVE (ENETUNREACH); 1053 break; 1054 } 1055 neg = sp->neg; 1056 untimeout(pppoe_ticker, sendhook, 1057 neg->timeout_handle); 1058 neg->pkt->pkt_header.ph.code = PADS_CODE; 1059 if (sp->Session_ID == 0) 1060 neg->pkt->pkt_header.ph.sid = 1061 htons(sp->Session_ID 1062 = get_new_sid(node)); 1063 neg->timeout = 0; 1064 /* 1065 * start working out the tags to respond with. 1066 */ 1067 init_tags(sp); 1068 insert_tag(sp, &neg->ac_name.hdr); /* AC_NAME */ 1069 if ((tag = get_tag(ph, PTT_SRV_NAME))) 1070 insert_tag(sp, tag);/* return service */ 1071 if ((tag = get_tag(ph, PTT_HOST_UNIQ))) 1072 insert_tag(sp, tag); /* return it */ 1073 insert_tag(sp, utag); /* ac_cookie */ 1074 scan_tags(sp, ph); 1075 make_packet(sp); 1076 sp->state = PPPOE_NEWCONNECTED; 1077 sendpacket(sp); 1078 /* 1079 * Having sent the last Negotiation header, 1080 * Set up the stored packet header to 1081 * be correct for the actual session. 1082 * But keep the negotialtion stuff 1083 * around in case we need to resend this last 1084 * packet. We'll discard it when we move 1085 * from NEWCONNECTED to CONNECTED 1086 */ 1087 sp->pkt_hdr = neg->pkt->pkt_header; 1088 sp->pkt_hdr.eh.ether_type 1089 = ETHERTYPE_PPPOE_SESS; 1090 sp->pkt_hdr.ph.code = 0; 1091 pppoe_send_event(sp, NGM_PPPOE_SUCCESS); 1092 break; 1093 case PADS_CODE: 1094 /* 1095 * We are a client: 1096 * Use the host_uniq tag to find the 1097 * hook this is in response to. 1098 * take the session ID and store it away. 1099 * Also make sure the pre-made header is 1100 * correct and set us into Session mode. 1101 */ 1102 utag = get_tag(ph, PTT_HOST_UNIQ); 1103 if ((utag == NULL) 1104 || (ntohs(utag->tag_len) != sizeof(sp))) { 1105 LEAVE (ENETUNREACH); 1106 break; 1107 } 1108 sendhook = pppoe_finduniq(node, utag); 1109 if (sendhook == NULL) { 1110 LEAVE(ENETUNREACH); 1111 } 1112 1113 /* 1114 * Check the session is in the right state. 1115 * It needs to be in PPPOE_SREQ. 1116 */ 1117 sp = sendhook->private; 1118 if (sp->state != PPPOE_SREQ) { 1119 LEAVE(ENETUNREACH); 1120 } 1121 neg = sp->neg; 1122 untimeout(pppoe_ticker, sendhook, 1123 neg->timeout_handle); 1124 neg->pkt->pkt_header.ph.sid = wh->ph.sid; 1125 sp->Session_ID = ntohs(wh->ph.sid); 1126 neg->timeout = 0; 1127 sp->state = PPPOE_CONNECTED; 1128 /* 1129 * Now we have gone to Connected mode, 1130 * Free all resources needed for 1131 * negotiation. 1132 * Keep a copy of the header we will be using. 1133 */ 1134 sp->pkt_hdr = neg->pkt->pkt_header; 1135 sp->pkt_hdr.eh.ether_type 1136 = ETHERTYPE_PPPOE_SESS; 1137 sp->pkt_hdr.ph.code = 0; 1138 m_freem(neg->m); 1139 FREE(sp->neg, M_NETGRAPH); 1140 sp->neg = NULL; 1141 pppoe_send_event(sp, NGM_PPPOE_SUCCESS); 1142 break; 1143 case PADT_CODE: 1144 /* 1145 * Send a 'close' message to the controlling 1146 * process (the one that set us up); 1147 * And then tear everything down. 1148 * 1149 * Find matching peer/session combination. 1150 */ 1151 sendhook = pppoe_findsession(node, wh); 1152 NG_FREE_DATA(m, meta); /* no longer needed */ 1153 if (sendhook == NULL) { 1154 LEAVE(ENETUNREACH); 1155 } 1156 /* send message to creator */ 1157 /* close hook */ 1158 if (sendhook) { 1159 ng_destroy_hook(sendhook); 1160 } 1161 break; 1162 default: 1163 LEAVE(EPFNOSUPPORT); 1164 } 1165 break; 1166 case ETHERTYPE_PPPOE_SESS: 1167 /* 1168 * find matching peer/session combination. 1169 */ 1170 sendhook = pppoe_findsession(node, wh); 1171 if (sendhook == NULL) { 1172 LEAVE (ENETUNREACH); 1173 break; 1174 } 1175 sp = sendhook->private; 1176 m_adj(m, sizeof(*wh)); 1177 if (m->m_pkthdr.len < length) { 1178 /* Packet too short, dump it */ 1179 LEAVE(EMSGSIZE); 1180 } 1181 1182 /* Also need to trim excess at the end */ 1183 if (m->m_pkthdr.len > length) { 1184 m_adj(m, -((int)(m->m_pkthdr.len - length))); 1185 } 1186 if ( sp->state != PPPOE_CONNECTED) { 1187 if (sp->state == PPPOE_NEWCONNECTED) { 1188 sp->state = PPPOE_CONNECTED; 1189 /* 1190 * Now we have gone to Connected mode, 1191 * Free all resources needed for 1192 * negotiation. Be paranoid about 1193 * whether there may be a timeout. 1194 */ 1195 m_freem(sp->neg->m); 1196 untimeout(pppoe_ticker, sendhook, 1197 sp->neg->timeout_handle); 1198 FREE(sp->neg, M_NETGRAPH); 1199 sp->neg = NULL; 1200 } else { 1201 LEAVE (ENETUNREACH); 1202 break; 1203 } 1204 } 1205 NG_SEND_DATA( error, sendhook, m, meta); 1206 break; 1207 default: 1208 LEAVE(EPFNOSUPPORT); 1209 } 1210 } else { 1211 /* 1212 * Not ethernet or debug hook.. 1213 * 1214 * The packet has come in on a normal hook. 1215 * We need to find out what kind of hook, 1216 * So we can decide how to handle it. 1217 * Check the hook's state. 1218 */ 1219 sp = hook->private; 1220 switch (sp->state) { 1221 case PPPOE_NEWCONNECTED: 1222 case PPPOE_CONNECTED: { 1223 static const u_char addrctrl[] = { 0xff, 0x03 }; 1224 struct pppoe_full_hdr *wh; 1225 1226 /* 1227 * Remove PPP address and control fields, if any. 1228 * For example, ng_ppp(4) always sends LCP packets 1229 * with address and control fields as required by 1230 * generic PPP. PPPoE is an exception to the rule. 1231 */ 1232 if (m->m_pkthdr.len >= 2) { 1233 if (m->m_len < 2 && !(m = m_pullup(m, 2))) 1234 LEAVE(ENOBUFS); 1235 if (bcmp(mtod(m, u_char *), addrctrl, 2) == 0) 1236 m_adj(m, 2); 1237 } 1238 /* 1239 * Bang in a pre-made header, and set the length up 1240 * to be correct. Then send it to the ethernet driver. 1241 * But first correct the length. 1242 */ 1243 sp->pkt_hdr.ph.length = htons((short)(m->m_pkthdr.len)); 1244 M_PREPEND(m, sizeof(*wh), M_DONTWAIT); 1245 if (m == NULL) { 1246 LEAVE(ENOBUFS); 1247 } 1248 wh = mtod(m, struct pppoe_full_hdr *); 1249 bcopy(&sp->pkt_hdr, wh, sizeof(*wh)); 1250 NG_SEND_DATA( error, privp->ethernet_hook, m, meta); 1251 privp->packets_out++; 1252 break; 1253 } 1254 case PPPOE_PRIMED: 1255 /* 1256 * A PADI packet is being returned by the application 1257 * that has set up this hook. This indicates that it 1258 * wants us to offer service. 1259 */ 1260 neg = sp->neg; 1261 if (m->m_len < sizeof(*wh)) { 1262 m = m_pullup(m, sizeof(*wh)); 1263 if (m == NULL) { 1264 LEAVE(ENOBUFS); 1265 } 1266 } 1267 wh = mtod(m, struct pppoe_full_hdr *); 1268 ph = &wh->ph; 1269 session = ntohs(wh->ph.sid); 1270 length = ntohs(wh->ph.length); 1271 code = wh->ph.code; 1272 if ( code != PADI_CODE) { 1273 LEAVE(EINVAL); 1274 }; 1275 untimeout(pppoe_ticker, hook, 1276 neg->timeout_handle); 1277 1278 /* 1279 * This is the first time we hear 1280 * from the client, so note it's 1281 * unicast address, replacing the 1282 * broadcast address. 1283 */ 1284 bcopy(wh->eh.ether_shost, 1285 neg->pkt->pkt_header.eh.ether_dhost, 1286 ETHER_ADDR_LEN); 1287 sp->state = PPPOE_SOFFER; 1288 neg->timeout = 0; 1289 neg->pkt->pkt_header.ph.code = PADO_CODE; 1290 1291 /* 1292 * start working out the tags to respond with. 1293 */ 1294 uniqtag.hdr.tag_type = PTT_AC_COOKIE; 1295 uniqtag.hdr.tag_len = htons((u_int16_t)sizeof(sp)); 1296 uniqtag.data.pointer = sp; 1297 init_tags(sp); 1298 insert_tag(sp, &neg->ac_name.hdr); /* AC_NAME */ 1299 if ((tag = get_tag(ph, PTT_SRV_NAME))) 1300 insert_tag(sp, tag); /* return service */
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1301 /* 1302 * If we have a NULL service request 1303 * and have an extra service defined in this hook, 1304 * then also add a tag for the extra service. 1305 * XXX this is a hack. eventually we should be able 1306 * to support advertising many services, not just one 1307 */ 1308 if (((tag == NULL) || (tag->tag_len == 0)) 1309 && (neg->service.hdr.tag_len != 0)) { 1310 insert_tag(sp, &neg->service.hdr); /* SERVICE */ 1311 } |
1312 if ((tag = get_tag(ph, PTT_HOST_UNIQ))) 1313 insert_tag(sp, tag); /* returned hostunique */ 1314 insert_tag(sp, &uniqtag.hdr);
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1274 /* XXX maybe put the tag in the session store */
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1315 scan_tags(sp, ph); 1316 make_packet(sp); 1317 sendpacket(sp); 1318 break; 1319 1320 /* 1321 * Packets coming from the hook make no sense 1322 * to sessions in these states. Throw them away. 1323 */ 1324 case PPPOE_SINIT: 1325 case PPPOE_SREQ: 1326 case PPPOE_SOFFER: 1327 case PPPOE_SNONE: 1328 case PPPOE_LISTENING: 1329 case PPPOE_DEAD: 1330 default: 1331 LEAVE(ENETUNREACH); 1332 } 1333 } 1334quit: 1335 NG_FREE_DATA(m, meta); 1336 return error; 1337} 1338 1339/* 1340 * Do local shutdown processing.. 1341 * If we are a persistant device, we might refuse to go away, and 1342 * we'd only remove our links and reset ourself. 1343 */ 1344static int 1345ng_pppoe_rmnode(node_p node) 1346{ 1347 const priv_p privdata = node->private; 1348 1349AAA 1350 node->flags |= NG_INVALID; 1351 ng_cutlinks(node); 1352 ng_unname(node); 1353 node->private = NULL; 1354 ng_unref(privdata->node); 1355 FREE(privdata, M_NETGRAPH); 1356 return (0); 1357} 1358 1359/* 1360 * This is called once we've already connected a new hook to the other node. 1361 * It gives us a chance to balk at the last minute. 1362 */ 1363static int 1364ng_pppoe_connect(hook_p hook) 1365{ 1366 /* be really amiable and just say "YUP that's OK by me! " */ 1367 return (0); 1368} 1369 1370/* 1371 * Hook disconnection 1372 * 1373 * Clean up all dangling links and information about the session/hook. 1374 * For this type, removal of the last link destroys the node 1375 */ 1376static int 1377ng_pppoe_disconnect(hook_p hook) 1378{ 1379 node_p node = hook->node; 1380 priv_p privp = node->private; 1381 sessp sp; 1382 int hooks; 1383 1384AAA 1385 hooks = node->numhooks; /* this one already not counted */ 1386 if (hook->private == &privp->debug_hook) { 1387 privp->debug_hook = NULL; 1388 } else if (hook->private == &privp->ethernet_hook) { 1389 privp->ethernet_hook = NULL; 1390 ng_rmnode(node); 1391 } else { 1392 sp = hook->private; 1393 if (sp->state != PPPOE_SNONE ) { 1394 pppoe_send_event(sp, NGM_PPPOE_CLOSE); 1395 } 1396 /* 1397 * According to the spec, if we are connected, 1398 * we should send a DISC packet if we are shutting down 1399 * a session. 1400 */ 1401 if ((privp->ethernet_hook) 1402 && ((sp->state == PPPOE_CONNECTED) 1403 || (sp->state == PPPOE_NEWCONNECTED))) { 1404 struct mbuf *m; 1405 struct pppoe_full_hdr *wh; 1406 struct pppoe_tag *tag; 1407 int msglen = strlen(SIGNOFF); 1408 void *dummy = NULL; 1409 int error = 0; 1410 1411 /* revert the stored header to DISC/PADT mode */ 1412 wh = &sp->pkt_hdr; 1413 wh->ph.code = PADT_CODE; 1414 wh->eh.ether_type = ETHERTYPE_PPPOE_DISC; 1415 1416 /* generate a packet of that type */ 1417 MGETHDR(m, M_DONTWAIT, MT_DATA); 1418 if(m == NULL) 1419 printf("pppoe: Session out of mbufs\n"); 1420 else { 1421 m->m_pkthdr.rcvif = NULL; 1422 m->m_pkthdr.len = m->m_len = sizeof(*wh); 1423 bcopy((caddr_t)wh, mtod(m, caddr_t), 1424 sizeof(*wh)); 1425 /* 1426 * Add a General error message and adjust 1427 * sizes 1428 */ 1429 wh = mtod(m, struct pppoe_full_hdr *); 1430 tag = wh->ph.tag; 1431 tag->tag_type = PTT_GEN_ERR; 1432 tag->tag_len = htons((u_int16_t)msglen); 1433 strncpy(tag->tag_data, SIGNOFF, msglen); 1434 m->m_pkthdr.len = (m->m_len += sizeof(*tag) + 1435 msglen); 1436 wh->ph.length = htons(sizeof(*tag) + msglen); 1437 NG_SEND_DATA(error, privp->ethernet_hook, m, 1438 dummy); 1439 } 1440 } 1441 /* 1442 * As long as we have somewhere to store the timeout handle, 1443 * we may have a timeout pending.. get rid of it. 1444 */ 1445 if (sp->neg) { 1446 untimeout(pppoe_ticker, hook, sp->neg->timeout_handle); 1447 if (sp->neg->m) 1448 m_freem(sp->neg->m); 1449 FREE(sp->neg, M_NETGRAPH); 1450 } 1451 FREE(sp, M_NETGRAPH); 1452 hook->private = NULL; 1453 /* work out how many session hooks there are */ 1454 /* Node goes away on last session hook removal */ 1455 if (privp->ethernet_hook) hooks -= 1; 1456 if (privp->debug_hook) hooks -= 1; 1457 } 1458 if (node->numhooks == 0) 1459 ng_rmnode(node); 1460 return (0); 1461} 1462 1463/* 1464 * timeouts come here. 1465 */ 1466static void 1467pppoe_ticker(void *arg) 1468{ 1469 int s = splnet(); 1470 hook_p hook = arg; 1471 sessp sp = hook->private; 1472 negp neg = sp->neg; 1473 int error = 0; 1474 struct mbuf *m0 = NULL; 1475 priv_p privp = hook->node->private; 1476 meta_p dummy = NULL; 1477 1478AAA 1479 switch(sp->state) { 1480 /* 1481 * resend the last packet, using an exponential backoff. 1482 * After a period of time, stop growing the backoff, 1483 * and either leave it, or revert to the start. 1484 */ 1485 case PPPOE_SINIT: 1486 case PPPOE_SREQ: 1487 /* timeouts on these produce resends */ 1488 m0 = m_copypacket(sp->neg->m, M_DONTWAIT); 1489 NG_SEND_DATA( error, privp->ethernet_hook, m0, dummy); 1490 neg->timeout_handle = timeout(pppoe_ticker, 1491 hook, neg->timeout * hz); 1492 if ((neg->timeout <<= 1) > PPPOE_TIMEOUT_LIMIT) { 1493 if (sp->state == PPPOE_SREQ) { 1494 /* revert to SINIT mode */ 1495 pppoe_start(sp); 1496 } else { 1497 neg->timeout = PPPOE_TIMEOUT_LIMIT; 1498 } 1499 } 1500 break; 1501 case PPPOE_PRIMED: 1502 case PPPOE_SOFFER: 1503 /* a timeout on these says "give up" */ 1504 ng_destroy_hook(hook); 1505 break; 1506 default: 1507 /* timeouts have no meaning in other states */ 1508 printf("pppoe: unexpected timeout\n"); 1509 } 1510 splx(s); 1511} 1512 1513 1514static void 1515sendpacket(sessp sp) 1516{ 1517 int error = 0; 1518 struct mbuf *m0 = NULL; 1519 hook_p hook = sp->hook; 1520 negp neg = sp->neg; 1521 priv_p privp = hook->node->private; 1522 meta_p dummy = NULL; 1523 1524AAA 1525 switch(sp->state) { 1526 case PPPOE_LISTENING: 1527 case PPPOE_DEAD: 1528 case PPPOE_SNONE: 1529 case PPPOE_CONNECTED: 1530 printf("pppoe: sendpacket: unexpected state\n"); 1531 break; 1532 1533 case PPPOE_NEWCONNECTED: 1534 /* send the PADS without a timeout - we're now connected */ 1535 m0 = m_copypacket(sp->neg->m, M_DONTWAIT); 1536 NG_SEND_DATA( error, privp->ethernet_hook, m0, dummy); 1537 break; 1538 1539 case PPPOE_PRIMED: 1540 /* No packet to send, but set up the timeout */ 1541 neg->timeout_handle = timeout(pppoe_ticker, 1542 hook, PPPOE_OFFER_TIMEOUT * hz); 1543 break; 1544 1545 case PPPOE_SOFFER: 1546 /* 1547 * send the offer but if they don't respond 1548 * in PPPOE_OFFER_TIMEOUT seconds, forget about it. 1549 */ 1550 m0 = m_copypacket(sp->neg->m, M_DONTWAIT); 1551 NG_SEND_DATA( error, privp->ethernet_hook, m0, dummy); 1552 neg->timeout_handle = timeout(pppoe_ticker, 1553 hook, PPPOE_OFFER_TIMEOUT * hz); 1554 break; 1555 1556 case PPPOE_SINIT: 1557 case PPPOE_SREQ: 1558 m0 = m_copypacket(sp->neg->m, M_DONTWAIT); 1559 NG_SEND_DATA( error, privp->ethernet_hook, m0, dummy); 1560 neg->timeout_handle = timeout(pppoe_ticker, hook, 1561 (hz * PPPOE_INITIAL_TIMEOUT)); 1562 neg->timeout = PPPOE_INITIAL_TIMEOUT * 2; 1563 break; 1564 1565 default: 1566 error = EINVAL; 1567 printf("pppoe: timeout: bad state\n"); 1568 } 1569 /* return (error); */ 1570} 1571 1572/* 1573 * Parse an incoming packet to see if any tags should be copied to the 1574 * output packet. Don't do any tags that have been handled in the main 1575 * state machine. 1576 */ 1577static struct pppoe_tag* 1578scan_tags(sessp sp, struct pppoe_hdr* ph) 1579{ 1580 char *end = (char *)next_tag(ph); 1581 char *ptn; 1582 struct pppoe_tag *pt = &ph->tag[0]; 1583 /* 1584 * Keep processing tags while a tag header will still fit. 1585 */ 1586AAA 1587 while((char*)(pt + 1) <= end) { 1588 /* 1589 * If the tag data would go past the end of the packet, abort. 1590 */ 1591 ptn = (((char *)(pt + 1)) + ntohs(pt->tag_len)); 1592 if(ptn > end) 1593 return NULL; 1594 1595 switch (pt->tag_type) { 1596 case PTT_RELAY_SID: 1597 insert_tag(sp, pt); 1598 break; 1599 case PTT_EOL: 1600 return NULL; 1601 case PTT_SRV_NAME: 1602 case PTT_AC_NAME: 1603 case PTT_HOST_UNIQ: 1604 case PTT_AC_COOKIE: 1605 case PTT_VENDOR: 1606 case PTT_SRV_ERR: 1607 case PTT_SYS_ERR: 1608 case PTT_GEN_ERR: 1609 break; 1610 } 1611 pt = (struct pppoe_tag*)ptn; 1612 } 1613 return NULL; 1614} 1615 1616static int 1617pppoe_send_event(sessp sp, enum cmd cmdid) 1618{ 1619 int error; 1620 struct ng_mesg *msg; 1621 struct ngpppoe_sts *sts; 1622 1623AAA 1624 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, cmdid, 1625 sizeof(struct ngpppoe_sts), M_NOWAIT);
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1626 if (msg == NULL) 1627 return (ENOMEM); |
1628 sts = (struct ngpppoe_sts *)msg->data; 1629 strncpy(sts->hook, sp->hook->name, NG_HOOKLEN + 1);
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1588 error = ng_send_msg(sp->hook->node, msg, sp->creator, NULL);
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1630 error = ng_send_msg(sp->hook->node, msg, sp->creator, NULL, NULL, NULL); |
1631 return (error); 1632}
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