1 /* 2 * ng_pppoe.c 3 */ 4 5 /*- 6 * Copyright (c) 1996-1999 Whistle Communications, Inc. 7 * All rights reserved. 8 * 9 * Subject to the following obligations and disclaimer of warranty, use and 10 * redistribution of this software, in source or object code forms, with or 11 * without modifications are expressly permitted by Whistle Communications; 12 * provided, however, that: 13 * 1. Any and all reproductions of the source or object code must include the 14 * copyright notice above and the following disclaimer of warranties; and 15 * 2. No rights are granted, in any manner or form, to use Whistle 16 * Communications, Inc. trademarks, including the mark "WHISTLE 17 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as 18 * such appears in the above copyright notice or in the software. 19 * 20 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND 21 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO 22 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, 23 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF 24 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. 25 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY 26 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS 27 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE. 28 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES 29 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING 30 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 31 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR 32 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY 33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 35 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY 36 * OF SUCH DAMAGE. 37 * 38 * Author: Julian Elischer <julian@freebsd.org> 39 * 40 * $FreeBSD$ 41 * $Whistle: ng_pppoe.c,v 1.10 1999/11/01 09:24:52 julian Exp $ 42 */ 43 44 #include <sys/param.h> 45 #include <sys/systm.h> 46 #include <sys/kernel.h> 47 #include <sys/ktr.h> 48 #include <sys/mbuf.h> 49 #include <sys/malloc.h> 50 #include <sys/errno.h> 51 #include <sys/epoch.h> 52 #include <sys/socket.h> 53 #include <sys/sysctl.h> 54 #include <sys/syslog.h> 55 #include <net/ethernet.h> 56 #include <net/if.h> 57 #include <net/if_vlan_var.h> 58 #include <net/vnet.h> 59 60 #include <netgraph/ng_message.h> 61 #include <netgraph/netgraph.h> 62 #include <netgraph/ng_parse.h> 63 #include <netgraph/ng_pppoe.h> 64 #include <netgraph/ng_ether.h> 65 66 #ifdef NG_SEPARATE_MALLOC 67 static MALLOC_DEFINE(M_NETGRAPH_PPPOE, "netgraph_pppoe", "netgraph pppoe node"); 68 #else 69 #define M_NETGRAPH_PPPOE M_NETGRAPH 70 #endif 71 72 /* Some PPP protocol numbers we're interested in */ 73 #define PROT_LCP 0xc021 74 75 #define SIGNOFF "session closed" 76 77 VNET_DEFINE_STATIC(u_int32_t, ng_pppoe_lcp_pcp) = 0; 78 #define V_ng_pppoe_lcp_pcp VNET(ng_pppoe_lcp_pcp) 79 80 SYSCTL_NODE(_net_graph, OID_AUTO, pppoe, CTLFLAG_RW, 0, "PPPoE"); 81 SYSCTL_UINT(_net_graph_pppoe, OID_AUTO, lcp_pcp, 82 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ng_pppoe_lcp_pcp), 0, 83 "Set PCP for LCP"); 84 85 /* 86 * This section contains the netgraph method declarations for the 87 * pppoe node. These methods define the netgraph pppoe 'type'. 88 */ 89 90 static ng_constructor_t ng_pppoe_constructor; 91 static ng_rcvmsg_t ng_pppoe_rcvmsg; 92 static ng_shutdown_t ng_pppoe_shutdown; 93 static ng_newhook_t ng_pppoe_newhook; 94 static ng_connect_t ng_pppoe_connect; 95 static ng_rcvdata_t ng_pppoe_rcvdata; 96 static ng_rcvdata_t ng_pppoe_rcvdata_ether; 97 static ng_rcvdata_t ng_pppoe_rcvdata_debug; 98 static ng_disconnect_t ng_pppoe_disconnect; 99 100 /* Parse type for struct ngpppoe_init_data */ 101 static const struct ng_parse_struct_field ngpppoe_init_data_type_fields[] 102 = NG_PPPOE_INIT_DATA_TYPE_INFO; 103 static const struct ng_parse_type ngpppoe_init_data_state_type = { 104 &ng_parse_struct_type, 105 &ngpppoe_init_data_type_fields 106 }; 107 108 /* Parse type for struct ngpppoe_sts */ 109 static const struct ng_parse_struct_field ng_pppoe_sts_type_fields[] 110 = NG_PPPOE_STS_TYPE_INFO; 111 static const struct ng_parse_type ng_pppoe_sts_state_type = { 112 &ng_parse_struct_type, 113 &ng_pppoe_sts_type_fields 114 }; 115 116 /* List of commands and how to convert arguments to/from ASCII */ 117 static const struct ng_cmdlist ng_pppoe_cmds[] = { 118 { 119 NGM_PPPOE_COOKIE, 120 NGM_PPPOE_CONNECT, 121 "pppoe_connect", 122 &ngpppoe_init_data_state_type, 123 NULL 124 }, 125 { 126 NGM_PPPOE_COOKIE, 127 NGM_PPPOE_LISTEN, 128 "pppoe_listen", 129 &ngpppoe_init_data_state_type, 130 NULL 131 }, 132 { 133 NGM_PPPOE_COOKIE, 134 NGM_PPPOE_OFFER, 135 "pppoe_offer", 136 &ngpppoe_init_data_state_type, 137 NULL 138 }, 139 { 140 NGM_PPPOE_COOKIE, 141 NGM_PPPOE_SERVICE, 142 "pppoe_service", 143 &ngpppoe_init_data_state_type, 144 NULL 145 }, 146 { 147 NGM_PPPOE_COOKIE, 148 NGM_PPPOE_SUCCESS, 149 "pppoe_success", 150 &ng_pppoe_sts_state_type, 151 NULL 152 }, 153 { 154 NGM_PPPOE_COOKIE, 155 NGM_PPPOE_FAIL, 156 "pppoe_fail", 157 &ng_pppoe_sts_state_type, 158 NULL 159 }, 160 { 161 NGM_PPPOE_COOKIE, 162 NGM_PPPOE_CLOSE, 163 "pppoe_close", 164 &ng_pppoe_sts_state_type, 165 NULL 166 }, 167 { 168 NGM_PPPOE_COOKIE, 169 NGM_PPPOE_SETMODE, 170 "pppoe_setmode", 171 &ng_parse_string_type, 172 NULL 173 }, 174 { 175 NGM_PPPOE_COOKIE, 176 NGM_PPPOE_GETMODE, 177 "pppoe_getmode", 178 NULL, 179 &ng_parse_string_type 180 }, 181 { 182 NGM_PPPOE_COOKIE, 183 NGM_PPPOE_SETENADDR, 184 "setenaddr", 185 &ng_parse_enaddr_type, 186 NULL 187 }, 188 { 189 NGM_PPPOE_COOKIE, 190 NGM_PPPOE_SETMAXP, 191 "setmaxp", 192 &ng_parse_uint16_type, 193 NULL 194 }, 195 { 196 NGM_PPPOE_COOKIE, 197 NGM_PPPOE_SEND_HURL, 198 "send_hurl", 199 &ngpppoe_init_data_state_type, 200 NULL 201 }, 202 { 203 NGM_PPPOE_COOKIE, 204 NGM_PPPOE_SEND_MOTM, 205 "send_motm", 206 &ngpppoe_init_data_state_type, 207 NULL 208 }, 209 { 0 } 210 }; 211 212 /* Netgraph node type descriptor */ 213 static struct ng_type typestruct = { 214 .version = NG_ABI_VERSION, 215 .name = NG_PPPOE_NODE_TYPE, 216 .constructor = ng_pppoe_constructor, 217 .rcvmsg = ng_pppoe_rcvmsg, 218 .shutdown = ng_pppoe_shutdown, 219 .newhook = ng_pppoe_newhook, 220 .connect = ng_pppoe_connect, 221 .rcvdata = ng_pppoe_rcvdata, 222 .disconnect = ng_pppoe_disconnect, 223 .cmdlist = ng_pppoe_cmds, 224 }; 225 NETGRAPH_INIT(pppoe, &typestruct); 226 227 /* 228 * States for the session state machine. 229 * These have no meaning if there is no hook attached yet. 230 */ 231 enum state { 232 PPPOE_SNONE=0, /* [both] Initial state */ 233 PPPOE_LISTENING, /* [Daemon] Listening for discover initiation pkt */ 234 PPPOE_SINIT, /* [Client] Sent discovery initiation */ 235 PPPOE_PRIMED, /* [Server] Awaiting PADI from daemon */ 236 PPPOE_SOFFER, /* [Server] Sent offer message (got PADI)*/ 237 PPPOE_SREQ, /* [Client] Sent a Request */ 238 PPPOE_NEWCONNECTED, /* [Server] Connection established, No data received */ 239 PPPOE_CONNECTED, /* [Both] Connection established, Data received */ 240 PPPOE_DEAD /* [Both] */ 241 }; 242 243 #define NUMTAGS 20 /* number of tags we are set up to work with */ 244 245 /* 246 * Information we store for each hook on each node for negotiating the 247 * session. The mbuf and cluster are freed once negotiation has completed. 248 * The whole negotiation block is then discarded. 249 */ 250 251 struct sess_neg { 252 struct mbuf *m; /* holds cluster with last sent packet */ 253 union packet *pkt; /* points within the above cluster */ 254 struct callout handle; /* see timeout(9) */ 255 u_int timeout; /* 0,1,2,4,8,16 etc. seconds */ 256 u_int numtags; 257 const struct pppoe_tag *tags[NUMTAGS]; 258 u_int service_len; 259 u_int ac_name_len; 260 u_int host_uniq_len; 261 262 struct datatag service; 263 struct datatag ac_name; 264 struct datatag host_uniq; 265 }; 266 typedef struct sess_neg *negp; 267 268 /* 269 * Session information that is needed after connection. 270 */ 271 struct sess_con { 272 hook_p hook; 273 uint16_t Session_ID; 274 enum state state; 275 ng_ID_t creator; /* who to notify */ 276 struct pppoe_full_hdr pkt_hdr; /* used when connected */ 277 negp neg; /* used when negotiating */ 278 LIST_ENTRY(sess_con) sessions; 279 }; 280 typedef struct sess_con *sessp; 281 282 #define SESSHASHSIZE 0x0100 283 #define SESSHASH(x) (((x) ^ ((x) >> 8)) & (SESSHASHSIZE - 1)) 284 285 struct sess_hash_entry { 286 struct mtx mtx; 287 LIST_HEAD(hhead, sess_con) head; 288 }; 289 290 /* 291 * Information we store for each node 292 */ 293 struct PPPoE { 294 node_p node; /* back pointer to node */ 295 hook_p ethernet_hook; 296 hook_p debug_hook; 297 u_int packets_in; /* packets in from ethernet */ 298 u_int packets_out; /* packets out towards ethernet */ 299 uint32_t flags; 300 #define COMPAT_3COM 0x00000001 301 #define COMPAT_DLINK 0x00000002 302 struct ether_header eh; 303 LIST_HEAD(, sess_con) listeners; 304 struct sess_hash_entry sesshash[SESSHASHSIZE]; 305 struct maxptag max_payload; /* PPP-Max-Payload (RFC4638) */ 306 }; 307 typedef struct PPPoE *priv_p; 308 309 union uniq { 310 char bytes[sizeof(void *)]; 311 void *pointer; 312 }; 313 314 #define LEAVE(x) do { error = x; goto quit; } while(0) 315 static void pppoe_start(sessp sp); 316 static void pppoe_ticker(node_p node, hook_p hook, void *arg1, int arg2); 317 static const struct pppoe_tag *scan_tags(sessp sp, 318 const struct pppoe_hdr* ph); 319 static int pppoe_send_event(sessp sp, enum cmd cmdid); 320 321 /************************************************************************* 322 * Some basic utilities from the Linux version with author's permission.* 323 * Author: Michal Ostrowski <mostrows@styx.uwaterloo.ca> * 324 ************************************************************************/ 325 326 /* 327 * Return the location where the next tag can be put 328 */ 329 static __inline const struct pppoe_tag* 330 next_tag(const struct pppoe_hdr* ph) 331 { 332 return (const struct pppoe_tag*)(((const char*)(ph + 1)) 333 + ntohs(ph->length)); 334 } 335 336 /* 337 * Look for a tag of a specific type. 338 * Don't trust any length the other end says, 339 * but assume we already sanity checked ph->length. 340 */ 341 static const struct pppoe_tag* 342 get_tag(const struct pppoe_hdr* ph, uint16_t idx) 343 { 344 const char *const end = (const char *)next_tag(ph); 345 const struct pppoe_tag *pt = (const void *)(ph + 1); 346 const char *ptn; 347 348 /* 349 * Keep processing tags while a tag header will still fit. 350 */ 351 while((const char*)(pt + 1) <= end) { 352 /* 353 * If the tag data would go past the end of the packet, abort. 354 */ 355 ptn = (((const char *)(pt + 1)) + ntohs(pt->tag_len)); 356 if (ptn > end) { 357 CTR2(KTR_NET, "%20s: invalid length for tag %d", 358 __func__, idx); 359 return (NULL); 360 } 361 if (pt->tag_type == idx) { 362 CTR2(KTR_NET, "%20s: found tag %d", __func__, idx); 363 return (pt); 364 } 365 366 pt = (const struct pppoe_tag*)ptn; 367 } 368 369 CTR2(KTR_NET, "%20s: not found tag %d", __func__, idx); 370 return (NULL); 371 } 372 373 /************************************************************************** 374 * Inlines to initialise or add tags to a session's tag list. 375 **************************************************************************/ 376 /* 377 * Initialise the session's tag list. 378 */ 379 static void 380 init_tags(sessp sp) 381 { 382 KASSERT(sp->neg != NULL, ("%s: no neg", __func__)); 383 sp->neg->numtags = 0; 384 } 385 386 static void 387 insert_tag(sessp sp, const struct pppoe_tag *tp) 388 { 389 negp neg = sp->neg; 390 int i; 391 392 KASSERT(neg != NULL, ("%s: no neg", __func__)); 393 if ((i = neg->numtags++) < NUMTAGS) { 394 neg->tags[i] = tp; 395 } else { 396 log(LOG_NOTICE, "ng_pppoe: asked to add too many tags to " 397 "packet\n"); 398 neg->numtags--; 399 } 400 } 401 402 /* 403 * Make up a packet, using the tags filled out for the session. 404 * 405 * Assume that the actual pppoe header and ethernet header 406 * are filled out externally to this routine. 407 * Also assume that neg->wh points to the correct 408 * location at the front of the buffer space. 409 */ 410 static void 411 make_packet(sessp sp) { 412 struct pppoe_full_hdr *wh = &sp->neg->pkt->pkt_header; 413 const struct pppoe_tag **tag; 414 char *dp; 415 int count; 416 int tlen; 417 uint16_t length = 0; 418 419 KASSERT((sp->neg != NULL) && (sp->neg->m != NULL), 420 ("%s: called from wrong state", __func__)); 421 CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID); 422 423 dp = (char *)(&wh->ph + 1); 424 for (count = 0, tag = sp->neg->tags; 425 ((count < sp->neg->numtags) && (count < NUMTAGS)); 426 tag++, count++) { 427 tlen = ntohs((*tag)->tag_len) + sizeof(**tag); 428 if ((length + tlen) > (ETHER_MAX_LEN - 4 - sizeof(*wh))) { 429 log(LOG_NOTICE, "ng_pppoe: tags too long\n"); 430 sp->neg->numtags = count; 431 break; /* XXX chop off what's too long */ 432 } 433 bcopy(*tag, (char *)dp, tlen); 434 length += tlen; 435 dp += tlen; 436 } 437 wh->ph.length = htons(length); 438 sp->neg->m->m_len = length + sizeof(*wh); 439 sp->neg->m->m_pkthdr.len = length + sizeof(*wh); 440 } 441 442 /************************************************************************** 443 * Routines to match a service. * 444 **************************************************************************/ 445 446 /* 447 * Find a hook that has a service string that matches that 448 * we are seeking. For now use a simple string. 449 * In the future we may need something like regexp(). 450 * 451 * Null string is a wildcard (ANY service), according to RFC2516. 452 * And historical FreeBSD wildcard is also "*". 453 */ 454 455 static hook_p 456 pppoe_match_svc(node_p node, const struct pppoe_tag *tag) 457 { 458 const priv_p privp = NG_NODE_PRIVATE(node); 459 sessp sp; 460 461 LIST_FOREACH(sp, &privp->listeners, sessions) { 462 negp neg = sp->neg; 463 464 /* Empty Service-Name matches any service. */ 465 if (neg->service_len == 0) 466 break; 467 468 /* Special case for a blank or "*" service name (wildcard). */ 469 if (neg->service_len == 1 && neg->service.data[0] == '*') 470 break; 471 472 /* If the lengths don't match, that aint it. */ 473 if (neg->service_len != ntohs(tag->tag_len)) 474 continue; 475 476 if (strncmp((const char *)(tag + 1), neg->service.data, 477 ntohs(tag->tag_len)) == 0) 478 break; 479 } 480 CTR3(KTR_NET, "%20s: matched %p for %s", __func__, 481 sp?sp->hook:NULL, (const char *)(tag + 1)); 482 483 return (sp?sp->hook:NULL); 484 } 485 486 /* 487 * Broadcast the PADI packet in m0 to all listening hooks. 488 * This routine is called when a PADI with empty Service-Name 489 * tag is received. Client should receive PADOs with all 490 * available services. 491 */ 492 static int 493 pppoe_broadcast_padi(node_p node, struct mbuf *m0) 494 { 495 const priv_p privp = NG_NODE_PRIVATE(node); 496 sessp sp; 497 int error = 0; 498 499 LIST_FOREACH(sp, &privp->listeners, sessions) { 500 struct mbuf *m; 501 502 m = m_dup(m0, M_NOWAIT); 503 if (m == NULL) 504 return (ENOMEM); 505 NG_SEND_DATA_ONLY(error, sp->hook, m); 506 if (error) 507 return (error); 508 } 509 510 return (0); 511 } 512 513 /* 514 * Find a hook, which name equals to given service. 515 */ 516 static hook_p 517 pppoe_find_svc(node_p node, const char *svc_name, int svc_len) 518 { 519 const priv_p privp = NG_NODE_PRIVATE(node); 520 sessp sp; 521 522 LIST_FOREACH(sp, &privp->listeners, sessions) { 523 negp neg = sp->neg; 524 525 if (neg->service_len == svc_len && 526 strncmp(svc_name, neg->service.data, svc_len) == 0) 527 return (sp->hook); 528 } 529 530 return (NULL); 531 } 532 533 /************************************************************************** 534 * Routines to find a particular session that matches an incoming packet. * 535 **************************************************************************/ 536 /* Find free session and add to hash. */ 537 static uint16_t 538 pppoe_getnewsession(sessp sp) 539 { 540 const priv_p privp = NG_NODE_PRIVATE(NG_HOOK_NODE(sp->hook)); 541 static uint16_t pppoe_sid = 1; 542 sessp tsp; 543 uint16_t val, hash; 544 545 restart: 546 /* Atomicity is not needed here as value will be checked. */ 547 val = pppoe_sid++; 548 /* Spec says 0xFFFF is reserved, also don't use 0x0000. */ 549 if (val == 0xffff || val == 0x0000) 550 val = pppoe_sid = 1; 551 552 /* Check it isn't already in use. */ 553 hash = SESSHASH(val); 554 mtx_lock(&privp->sesshash[hash].mtx); 555 LIST_FOREACH(tsp, &privp->sesshash[hash].head, sessions) { 556 if (tsp->Session_ID == val) 557 break; 558 } 559 if (!tsp) { 560 sp->Session_ID = val; 561 LIST_INSERT_HEAD(&privp->sesshash[hash].head, sp, sessions); 562 } 563 mtx_unlock(&privp->sesshash[hash].mtx); 564 if (tsp) 565 goto restart; 566 567 CTR2(KTR_NET, "%20s: new sid %d", __func__, val); 568 569 return (val); 570 } 571 572 /* Add specified session to hash. */ 573 static void 574 pppoe_addsession(sessp sp) 575 { 576 const priv_p privp = NG_NODE_PRIVATE(NG_HOOK_NODE(sp->hook)); 577 uint16_t hash = SESSHASH(sp->Session_ID); 578 579 mtx_lock(&privp->sesshash[hash].mtx); 580 LIST_INSERT_HEAD(&privp->sesshash[hash].head, sp, sessions); 581 mtx_unlock(&privp->sesshash[hash].mtx); 582 } 583 584 /* Delete specified session from hash. */ 585 static void 586 pppoe_delsession(sessp sp) 587 { 588 const priv_p privp = NG_NODE_PRIVATE(NG_HOOK_NODE(sp->hook)); 589 uint16_t hash = SESSHASH(sp->Session_ID); 590 591 mtx_lock(&privp->sesshash[hash].mtx); 592 LIST_REMOVE(sp, sessions); 593 mtx_unlock(&privp->sesshash[hash].mtx); 594 } 595 596 /* Find matching peer/session combination. */ 597 static sessp 598 pppoe_findsession(priv_p privp, const struct pppoe_full_hdr *wh) 599 { 600 uint16_t session = ntohs(wh->ph.sid); 601 uint16_t hash = SESSHASH(session); 602 sessp sp = NULL; 603 604 mtx_lock(&privp->sesshash[hash].mtx); 605 LIST_FOREACH(sp, &privp->sesshash[hash].head, sessions) { 606 if (sp->Session_ID == session && 607 bcmp(sp->pkt_hdr.eh.ether_dhost, 608 wh->eh.ether_shost, ETHER_ADDR_LEN) == 0) { 609 break; 610 } 611 } 612 mtx_unlock(&privp->sesshash[hash].mtx); 613 CTR3(KTR_NET, "%20s: matched %p for %d", __func__, sp?sp->hook:NULL, 614 session); 615 616 return (sp); 617 } 618 619 static hook_p 620 pppoe_finduniq(node_p node, const struct pppoe_tag *tag) 621 { 622 hook_p hook = NULL; 623 sessp sp; 624 625 /* Cycle through all known hooks. */ 626 LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) { 627 /* Skip any nonsession hook. */ 628 if (NG_HOOK_PRIVATE(hook) == NULL) 629 continue; 630 sp = NG_HOOK_PRIVATE(hook); 631 /* Skip already connected sessions. */ 632 if (sp->neg == NULL) 633 continue; 634 if (sp->neg->host_uniq_len == ntohs(tag->tag_len) && 635 bcmp(sp->neg->host_uniq.data, (const char *)(tag + 1), 636 sp->neg->host_uniq_len) == 0) 637 break; 638 } 639 CTR3(KTR_NET, "%20s: matched %p for %p", __func__, hook, sp); 640 641 return (hook); 642 } 643 644 static hook_p 645 pppoe_findcookie(node_p node, const struct pppoe_tag *tag) 646 { 647 hook_p hook = NULL; 648 union uniq cookie; 649 650 bcopy(tag + 1, cookie.bytes, sizeof(void *)); 651 /* Cycle through all known hooks. */ 652 LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) { 653 /* Skip any nonsession hook. */ 654 if (NG_HOOK_PRIVATE(hook) == NULL) 655 continue; 656 if (cookie.pointer == NG_HOOK_PRIVATE(hook)) 657 break; 658 } 659 CTR3(KTR_NET, "%20s: matched %p for %p", __func__, hook, cookie.pointer); 660 661 return (hook); 662 } 663 664 /************************************************************************** 665 * Start of Netgraph entrypoints. * 666 **************************************************************************/ 667 668 /* 669 * Allocate the private data structure and link it with node. 670 */ 671 static int 672 ng_pppoe_constructor(node_p node) 673 { 674 priv_p privp; 675 int i; 676 677 /* Initialize private descriptor. */ 678 privp = malloc(sizeof(*privp), M_NETGRAPH_PPPOE, M_WAITOK | M_ZERO); 679 680 /* Link structs together; this counts as our one reference to *node. */ 681 NG_NODE_SET_PRIVATE(node, privp); 682 privp->node = node; 683 684 /* Initialize to standard mode. */ 685 memset(&privp->eh.ether_dhost, 0xff, ETHER_ADDR_LEN); 686 privp->eh.ether_type = ETHERTYPE_PPPOE_DISC; 687 688 LIST_INIT(&privp->listeners); 689 for (i = 0; i < SESSHASHSIZE; i++) { 690 mtx_init(&privp->sesshash[i].mtx, "PPPoE hash mutex", NULL, MTX_DEF); 691 LIST_INIT(&privp->sesshash[i].head); 692 } 693 694 CTR3(KTR_NET, "%20s: created node [%x] (%p)", 695 __func__, node->nd_ID, node); 696 697 return (0); 698 } 699 700 /* 701 * Give our ok for a hook to be added... 702 * point the hook's private info to the hook structure. 703 * 704 * The following hook names are special: 705 * "ethernet": the hook that should be connected to a NIC. 706 * "debug": copies of data sent out here (when I write the code). 707 * All other hook names need only be unique. (the framework checks this). 708 */ 709 static int 710 ng_pppoe_newhook(node_p node, hook_p hook, const char *name) 711 { 712 const priv_p privp = NG_NODE_PRIVATE(node); 713 sessp sp; 714 715 if (strcmp(name, NG_PPPOE_HOOK_ETHERNET) == 0) { 716 privp->ethernet_hook = hook; 717 NG_HOOK_SET_RCVDATA(hook, ng_pppoe_rcvdata_ether); 718 } else if (strcmp(name, NG_PPPOE_HOOK_DEBUG) == 0) { 719 privp->debug_hook = hook; 720 NG_HOOK_SET_RCVDATA(hook, ng_pppoe_rcvdata_debug); 721 } else { 722 /* 723 * Any other unique name is OK. 724 * The infrastructure has already checked that it's unique, 725 * so just allocate it and hook it in. 726 */ 727 sp = malloc(sizeof(*sp), M_NETGRAPH_PPPOE, M_NOWAIT | M_ZERO); 728 if (sp == NULL) 729 return (ENOMEM); 730 731 NG_HOOK_SET_PRIVATE(hook, sp); 732 sp->hook = hook; 733 } 734 CTR5(KTR_NET, "%20s: node [%x] (%p) connected hook %s (%p)", 735 __func__, node->nd_ID, node, name, hook); 736 737 return(0); 738 } 739 740 /* 741 * Hook has been added successfully. Request the MAC address of 742 * the underlying Ethernet node. 743 */ 744 static int 745 ng_pppoe_connect(hook_p hook) 746 { 747 const priv_p privp = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 748 struct ng_mesg *msg; 749 int error; 750 751 if (hook != privp->ethernet_hook) 752 return (0); 753 754 /* 755 * If this is Ethernet hook, then request MAC address 756 * from our downstream. 757 */ 758 NG_MKMESSAGE(msg, NGM_ETHER_COOKIE, NGM_ETHER_GET_ENADDR, 0, M_NOWAIT); 759 if (msg == NULL) 760 return (ENOBUFS); 761 762 /* 763 * Our hook and peer hook have HK_INVALID flag set, 764 * so we can't use NG_SEND_MSG_HOOK() macro here. 765 */ 766 NG_SEND_MSG_ID(error, privp->node, msg, 767 NG_NODE_ID(NG_PEER_NODE(privp->ethernet_hook)), 768 NG_NODE_ID(privp->node)); 769 770 return (error); 771 } 772 /* 773 * Get a netgraph control message. 774 * Check it is one we understand. If needed, send a response. 775 * We sometimes save the address for an async action later. 776 * Always free the message. 777 */ 778 static int 779 ng_pppoe_rcvmsg(node_p node, item_p item, hook_p lasthook) 780 { 781 struct epoch_tracker et; 782 priv_p privp = NG_NODE_PRIVATE(node); 783 struct ngpppoe_init_data *ourmsg = NULL; 784 struct ng_mesg *resp = NULL; 785 int error = 0; 786 hook_p hook = NULL; 787 sessp sp = NULL; 788 negp neg = NULL; 789 struct ng_mesg *msg; 790 791 NGI_GET_MSG(item, msg); 792 CTR5(KTR_NET, "%20s: node [%x] (%p) got message %d with cookie %d", 793 __func__, node->nd_ID, node, msg->header.cmd, 794 msg->header.typecookie); 795 796 /* Deal with message according to cookie and command. */ 797 switch (msg->header.typecookie) { 798 case NGM_PPPOE_COOKIE: 799 switch (msg->header.cmd) { 800 case NGM_PPPOE_CONNECT: 801 case NGM_PPPOE_LISTEN: 802 case NGM_PPPOE_OFFER: 803 case NGM_PPPOE_SERVICE: 804 case NGM_PPPOE_SEND_HURL: 805 case NGM_PPPOE_SEND_MOTM: 806 ourmsg = (struct ngpppoe_init_data *)msg->data; 807 if (msg->header.arglen < sizeof(*ourmsg)) { 808 log(LOG_ERR, "ng_pppoe[%x]: init data too " 809 "small\n", node->nd_ID); 810 LEAVE(EMSGSIZE); 811 } 812 if (msg->header.cmd == NGM_PPPOE_SEND_HURL || 813 msg->header.cmd == NGM_PPPOE_SEND_MOTM) { 814 if (msg->header.arglen - sizeof(*ourmsg) > 815 PPPOE_PADM_VALUE_SIZE) { 816 log(LOG_ERR, "ng_pppoe[%x]: message " 817 "too big\n", node->nd_ID); 818 LEAVE(EMSGSIZE); 819 } 820 } else { 821 if (msg->header.arglen - sizeof(*ourmsg) > 822 PPPOE_SERVICE_NAME_SIZE) { 823 log(LOG_ERR, "ng_pppoe[%x]: service name " 824 "too big\n", node->nd_ID); 825 LEAVE(EMSGSIZE); 826 } 827 } 828 if (msg->header.arglen - sizeof(*ourmsg) < 829 ourmsg->data_len) { 830 log(LOG_ERR, "ng_pppoe[%x]: init data has bad " 831 "length, %d should be %zd\n", node->nd_ID, 832 ourmsg->data_len, 833 msg->header.arglen - sizeof (*ourmsg)); 834 LEAVE(EMSGSIZE); 835 } 836 837 /* Make sure strcmp will terminate safely. */ 838 ourmsg->hook[sizeof(ourmsg->hook) - 1] = '\0'; 839 840 /* Find hook by name. */ 841 hook = ng_findhook(node, ourmsg->hook); 842 if (hook == NULL) 843 LEAVE(ENOENT); 844 845 sp = NG_HOOK_PRIVATE(hook); 846 if (sp == NULL) 847 LEAVE(EINVAL); 848 849 if (msg->header.cmd == NGM_PPPOE_LISTEN) { 850 /* 851 * Ensure we aren't already listening for this 852 * service. 853 */ 854 if (pppoe_find_svc(node, ourmsg->data, 855 ourmsg->data_len) != NULL) 856 LEAVE(EEXIST); 857 } 858 859 /* 860 * PPPOE_SERVICE advertisements are set up 861 * on sessions that are in PRIMED state. 862 */ 863 if (msg->header.cmd == NGM_PPPOE_SERVICE) 864 break; 865 866 /* 867 * PADM messages are set up on active sessions. 868 */ 869 if (msg->header.cmd == NGM_PPPOE_SEND_HURL || 870 msg->header.cmd == NGM_PPPOE_SEND_MOTM) { 871 if (sp->state != PPPOE_NEWCONNECTED && 872 sp->state != PPPOE_CONNECTED) { 873 log(LOG_NOTICE, "ng_pppoe[%x]: session is not " 874 "active\n", node->nd_ID); 875 LEAVE(EISCONN); 876 } 877 break; 878 } 879 880 if (sp->state != PPPOE_SNONE) { 881 log(LOG_NOTICE, "ng_pppoe[%x]: Session already " 882 "active\n", node->nd_ID); 883 LEAVE(EISCONN); 884 } 885 886 /* 887 * Set up prototype header. 888 */ 889 neg = malloc(sizeof(*neg), M_NETGRAPH_PPPOE, 890 M_NOWAIT | M_ZERO); 891 892 if (neg == NULL) 893 LEAVE(ENOMEM); 894 895 neg->m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); 896 if (neg->m == NULL) { 897 free(neg, M_NETGRAPH_PPPOE); 898 LEAVE(ENOBUFS); 899 } 900 neg->m->m_pkthdr.rcvif = NULL; 901 sp->neg = neg; 902 ng_callout_init(&neg->handle); 903 neg->m->m_len = sizeof(struct pppoe_full_hdr); 904 neg->pkt = mtod(neg->m, union packet*); 905 memcpy((void *)&neg->pkt->pkt_header.eh, 906 &privp->eh, sizeof(struct ether_header)); 907 neg->pkt->pkt_header.ph.ver = 0x1; 908 neg->pkt->pkt_header.ph.type = 0x1; 909 neg->pkt->pkt_header.ph.sid = 0x0000; 910 neg->timeout = 0; 911 912 sp->creator = NGI_RETADDR(item); 913 } 914 switch (msg->header.cmd) { 915 case NGM_PPPOE_GET_STATUS: 916 { 917 struct ngpppoestat *stats; 918 919 NG_MKRESPONSE(resp, msg, sizeof(*stats), M_NOWAIT); 920 if (!resp) 921 LEAVE(ENOMEM); 922 923 stats = (struct ngpppoestat *) resp->data; 924 stats->packets_in = privp->packets_in; 925 stats->packets_out = privp->packets_out; 926 break; 927 } 928 case NGM_PPPOE_CONNECT: 929 { 930 /* 931 * Check the hook exists and is Uninitialised. 932 * Send a PADI request, and start the timeout logic. 933 * Store the originator of this message so we can send 934 * a success or fail message to them later. 935 * Move the session to SINIT. 936 * Set up the session to the correct state and 937 * start it. 938 */ 939 int acnpos, acnlen = 0, acnsep = 0; 940 int hupos, hulen = 0, husep = 0; 941 int i, srvpos, srvlen; 942 acnpos = 0; 943 for (i = 0; i < ourmsg->data_len; i++) { 944 if (ourmsg->data[i] == '\\') { 945 acnlen = i; 946 acnsep = 1; 947 break; 948 } 949 } 950 hupos = acnlen + acnsep; 951 for (i = hupos; i < ourmsg->data_len; i++) { 952 if (ourmsg->data[i] == '|') { 953 hulen = i - hupos; 954 husep = 1; 955 break; 956 } 957 } 958 srvpos = hupos + hulen + husep; 959 srvlen = ourmsg->data_len - srvpos; 960 961 bcopy(ourmsg->data + acnpos, neg->ac_name.data, acnlen); 962 neg->ac_name_len = acnlen; 963 964 neg->host_uniq.hdr.tag_type = PTT_HOST_UNIQ; 965 if (hulen == 0) { 966 /* Not provided, generate one */ 967 neg->host_uniq.hdr.tag_len = htons(sizeof(sp)); 968 bcopy(&sp, neg->host_uniq.data, sizeof(sp)); 969 neg->host_uniq_len = sizeof(sp); 970 } else if (hulen > 2 && ourmsg->data[hupos] == '0' && 971 ourmsg->data[hupos + 1] == 'x' && hulen % 2 == 0) { 972 /* Hex encoded */ 973 static const char hexdig[16] = "0123456789abcdef"; 974 int j; 975 976 neg->host_uniq.hdr.tag_len = htons((uint16_t)(hulen / 2 - 1)); 977 for (i = 0; i < hulen - 2; i++) { 978 for (j = 0; 979 j < 16 && 980 ourmsg->data[hupos + 2 + i] != hexdig[j]; 981 j++); 982 if (j == 16) 983 LEAVE(EINVAL); 984 if (i % 2 == 0) 985 neg->host_uniq.data[i / 2] = j << 4; 986 else 987 neg->host_uniq.data[i / 2] |= j; 988 } 989 neg->host_uniq_len = hulen / 2 - 1; 990 } else { 991 /* Plain string */ 992 neg->host_uniq.hdr.tag_len = htons((uint16_t)hulen); 993 bcopy(ourmsg->data + hupos, neg->host_uniq.data, hulen); 994 neg->host_uniq_len = hulen; 995 } 996 997 neg->service.hdr.tag_type = PTT_SRV_NAME; 998 neg->service.hdr.tag_len = htons((uint16_t)srvlen); 999 bcopy(ourmsg->data + srvpos, neg->service.data, srvlen); 1000 neg->service_len = srvlen; 1001 NET_EPOCH_ENTER(et); 1002 pppoe_start(sp); 1003 NET_EPOCH_EXIT(et); 1004 break; 1005 } 1006 case NGM_PPPOE_LISTEN: 1007 /* 1008 * Check the hook exists and is Uninitialised. 1009 * Install the service matching string. 1010 * Store the originator of this message so we can send 1011 * a success or fail message to them later. 1012 * Move the hook to 'LISTENING' 1013 */ 1014 neg->service.hdr.tag_type = PTT_SRV_NAME; 1015 neg->service.hdr.tag_len = 1016 htons((uint16_t)ourmsg->data_len); 1017 1018 if (ourmsg->data_len) 1019 bcopy(ourmsg->data, neg->service.data, 1020 ourmsg->data_len); 1021 neg->service_len = ourmsg->data_len; 1022 neg->pkt->pkt_header.ph.code = PADT_CODE; 1023 /* 1024 * Wait for PADI packet coming from Ethernet. 1025 */ 1026 sp->state = PPPOE_LISTENING; 1027 LIST_INSERT_HEAD(&privp->listeners, sp, sessions); 1028 break; 1029 case NGM_PPPOE_OFFER: 1030 /* 1031 * Check the hook exists and is Uninitialised. 1032 * Store the originator of this message so we can send 1033 * a success of fail message to them later. 1034 * Store the AC-Name given and go to PRIMED. 1035 */ 1036 neg->ac_name.hdr.tag_type = PTT_AC_NAME; 1037 neg->ac_name.hdr.tag_len = 1038 htons((uint16_t)ourmsg->data_len); 1039 if (ourmsg->data_len) 1040 bcopy(ourmsg->data, neg->ac_name.data, 1041 ourmsg->data_len); 1042 neg->ac_name_len = ourmsg->data_len; 1043 neg->pkt->pkt_header.ph.code = PADO_CODE; 1044 /* 1045 * Wait for PADI packet coming from hook. 1046 */ 1047 sp->state = PPPOE_PRIMED; 1048 break; 1049 case NGM_PPPOE_SERVICE: 1050 /* 1051 * Check the session is primed. 1052 * for now just allow ONE service to be advertised. 1053 * If you do it twice you just overwrite. 1054 */ 1055 if (sp->state != PPPOE_PRIMED) { 1056 log(LOG_NOTICE, "ng_pppoe[%x]: session not " 1057 "primed\n", node->nd_ID); 1058 LEAVE(EISCONN); 1059 } 1060 neg = sp->neg; 1061 neg->service.hdr.tag_type = PTT_SRV_NAME; 1062 neg->service.hdr.tag_len = 1063 htons((uint16_t)ourmsg->data_len); 1064 1065 if (ourmsg->data_len) 1066 bcopy(ourmsg->data, neg->service.data, 1067 ourmsg->data_len); 1068 neg->service_len = ourmsg->data_len; 1069 break; 1070 case NGM_PPPOE_SETMODE: 1071 { 1072 char *s; 1073 size_t len; 1074 1075 if (msg->header.arglen == 0) 1076 LEAVE(EINVAL); 1077 1078 s = (char *)msg->data; 1079 len = msg->header.arglen - 1; 1080 1081 /* Search for matching mode string. */ 1082 if (len == strlen(NG_PPPOE_STANDARD) && 1083 (strncmp(NG_PPPOE_STANDARD, s, len) == 0)) { 1084 privp->flags = 0; 1085 privp->eh.ether_type = ETHERTYPE_PPPOE_DISC; 1086 break; 1087 } 1088 if (len == strlen(NG_PPPOE_3COM) && 1089 (strncmp(NG_PPPOE_3COM, s, len) == 0)) { 1090 privp->flags |= COMPAT_3COM; 1091 privp->eh.ether_type = 1092 ETHERTYPE_PPPOE_3COM_DISC; 1093 break; 1094 } 1095 if (len == strlen(NG_PPPOE_DLINK) && 1096 (strncmp(NG_PPPOE_DLINK, s, len) == 0)) { 1097 privp->flags |= COMPAT_DLINK; 1098 break; 1099 } 1100 error = EINVAL; 1101 break; 1102 } 1103 case NGM_PPPOE_GETMODE: 1104 { 1105 char *s; 1106 size_t len = 0; 1107 1108 if (privp->flags == 0) 1109 len += strlen(NG_PPPOE_STANDARD) + 1; 1110 if (privp->flags & COMPAT_3COM) 1111 len += strlen(NG_PPPOE_3COM) + 1; 1112 if (privp->flags & COMPAT_DLINK) 1113 len += strlen(NG_PPPOE_DLINK) + 1; 1114 1115 NG_MKRESPONSE(resp, msg, len, M_NOWAIT); 1116 if (resp == NULL) 1117 LEAVE(ENOMEM); 1118 1119 s = (char *)resp->data; 1120 if (privp->flags == 0) { 1121 len = strlen(NG_PPPOE_STANDARD); 1122 strlcpy(s, NG_PPPOE_STANDARD, len + 1); 1123 break; 1124 } 1125 if (privp->flags & COMPAT_3COM) { 1126 len = strlen(NG_PPPOE_3COM); 1127 strlcpy(s, NG_PPPOE_3COM, len + 1); 1128 s += len; 1129 } 1130 if (privp->flags & COMPAT_DLINK) { 1131 if (s != resp->data) 1132 *s++ = '|'; 1133 len = strlen(NG_PPPOE_DLINK); 1134 strlcpy(s, NG_PPPOE_DLINK, len + 1); 1135 } 1136 break; 1137 } 1138 case NGM_PPPOE_SETENADDR: 1139 if (msg->header.arglen != ETHER_ADDR_LEN) 1140 LEAVE(EINVAL); 1141 bcopy(msg->data, &privp->eh.ether_shost, 1142 ETHER_ADDR_LEN); 1143 break; 1144 case NGM_PPPOE_SETMAXP: 1145 if (msg->header.arglen != sizeof(uint16_t)) 1146 LEAVE(EINVAL); 1147 privp->max_payload.hdr.tag_type = PTT_MAX_PAYL; 1148 privp->max_payload.hdr.tag_len = htons(sizeof(uint16_t)); 1149 privp->max_payload.data = htons(*((uint16_t *)msg->data)); 1150 break; 1151 case NGM_PPPOE_SEND_HURL: 1152 { 1153 struct mbuf *m; 1154 1155 /* Generate a packet of that type. */ 1156 m = m_gethdr(M_NOWAIT, MT_DATA); 1157 if (m == NULL) 1158 log(LOG_NOTICE, "ng_pppoe[%x]: session out of " 1159 "mbufs\n", node->nd_ID); 1160 else { 1161 struct pppoe_full_hdr *wh; 1162 struct pppoe_tag *tag; 1163 int error = 0; 1164 1165 wh = mtod(m, struct pppoe_full_hdr *); 1166 bcopy(&sp->pkt_hdr, wh, sizeof(*wh)); 1167 1168 /* Revert the stored header to DISC/PADM mode. */ 1169 wh->ph.code = PADM_CODE; 1170 /* 1171 * Configure ethertype depending on what 1172 * was used during sessions stage. 1173 */ 1174 if (wh->eh.ether_type == 1175 ETHERTYPE_PPPOE_3COM_SESS) 1176 wh->eh.ether_type = ETHERTYPE_PPPOE_3COM_DISC; 1177 else 1178 wh->eh.ether_type = ETHERTYPE_PPPOE_DISC; 1179 /* 1180 * Add PADM message and adjust sizes. 1181 */ 1182 tag = (void *)(&wh->ph + 1); 1183 tag->tag_type = PTT_HURL; 1184 tag->tag_len = htons(ourmsg->data_len); 1185 strncpy((char *)(tag + 1), ourmsg->data, ourmsg->data_len); 1186 m->m_pkthdr.len = m->m_len = sizeof(*wh) + sizeof(*tag) + 1187 ourmsg->data_len; 1188 wh->ph.length = htons(sizeof(*tag) + ourmsg->data_len); 1189 NET_EPOCH_ENTER(et); 1190 NG_SEND_DATA_ONLY(error, 1191 privp->ethernet_hook, m); 1192 NET_EPOCH_EXIT(et); 1193 } 1194 break; 1195 } 1196 case NGM_PPPOE_SEND_MOTM: 1197 { 1198 struct mbuf *m; 1199 1200 /* Generate a packet of that type. */ 1201 m = m_gethdr(M_NOWAIT, MT_DATA); 1202 if (m == NULL) 1203 log(LOG_NOTICE, "ng_pppoe[%x]: session out of " 1204 "mbufs\n", node->nd_ID); 1205 else { 1206 struct pppoe_full_hdr *wh; 1207 struct pppoe_tag *tag; 1208 int error = 0; 1209 1210 wh = mtod(m, struct pppoe_full_hdr *); 1211 bcopy(&sp->pkt_hdr, wh, sizeof(*wh)); 1212 1213 /* Revert the stored header to DISC/PADM mode. */ 1214 wh->ph.code = PADM_CODE; 1215 /* 1216 * Configure ethertype depending on what 1217 * was used during sessions stage. 1218 */ 1219 if (wh->eh.ether_type == 1220 ETHERTYPE_PPPOE_3COM_SESS) 1221 wh->eh.ether_type = ETHERTYPE_PPPOE_3COM_DISC; 1222 else 1223 wh->eh.ether_type = ETHERTYPE_PPPOE_DISC; 1224 /* 1225 * Add PADM message and adjust sizes. 1226 */ 1227 tag = (void *)(&wh->ph + 1); 1228 tag->tag_type = PTT_MOTM; 1229 tag->tag_len = htons(ourmsg->data_len); 1230 strncpy((char *)(tag + 1), ourmsg->data, ourmsg->data_len); 1231 m->m_pkthdr.len = m->m_len = sizeof(*wh) + sizeof(*tag) + 1232 ourmsg->data_len; 1233 wh->ph.length = htons(sizeof(*tag) + ourmsg->data_len); 1234 NET_EPOCH_ENTER(et); 1235 NG_SEND_DATA_ONLY(error, 1236 privp->ethernet_hook, m); 1237 NET_EPOCH_EXIT(et); 1238 } 1239 break; 1240 } 1241 default: 1242 LEAVE(EINVAL); 1243 } 1244 break; 1245 case NGM_ETHER_COOKIE: 1246 if (!(msg->header.flags & NGF_RESP)) 1247 LEAVE(EINVAL); 1248 switch (msg->header.cmd) { 1249 case NGM_ETHER_GET_ENADDR: 1250 if (msg->header.arglen != ETHER_ADDR_LEN) 1251 LEAVE(EINVAL); 1252 bcopy(msg->data, &privp->eh.ether_shost, 1253 ETHER_ADDR_LEN); 1254 break; 1255 default: 1256 LEAVE(EINVAL); 1257 } 1258 break; 1259 default: 1260 LEAVE(EINVAL); 1261 } 1262 1263 /* Take care of synchronous response, if any. */ 1264 quit: 1265 CTR2(KTR_NET, "%20s: returning %d", __func__, error); 1266 NG_RESPOND_MSG(error, node, item, resp); 1267 /* Free the message and return. */ 1268 NG_FREE_MSG(msg); 1269 return(error); 1270 } 1271 1272 /* 1273 * Start a client into the first state. A separate function because 1274 * it can be needed if the negotiation times out. 1275 */ 1276 static void 1277 pppoe_start(sessp sp) 1278 { 1279 hook_p hook = sp->hook; 1280 node_p node = NG_HOOK_NODE(hook); 1281 priv_p privp = NG_NODE_PRIVATE(node); 1282 negp neg = sp->neg; 1283 struct mbuf *m0; 1284 int error; 1285 1286 /* 1287 * Kick the state machine into starting up. 1288 */ 1289 CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID); 1290 sp->state = PPPOE_SINIT; 1291 /* 1292 * Reset the packet header to broadcast. Since we are 1293 * in a client mode use configured ethertype. 1294 */ 1295 memcpy((void *)&neg->pkt->pkt_header.eh, &privp->eh, 1296 sizeof(struct ether_header)); 1297 neg->pkt->pkt_header.ph.code = PADI_CODE; 1298 init_tags(sp); 1299 insert_tag(sp, &neg->host_uniq.hdr); 1300 insert_tag(sp, &neg->service.hdr); 1301 if (privp->max_payload.data != 0) 1302 insert_tag(sp, &privp->max_payload.hdr); 1303 make_packet(sp); 1304 /* 1305 * Send packet and prepare to retransmit it after timeout. 1306 */ 1307 ng_callout(&neg->handle, node, hook, PPPOE_INITIAL_TIMEOUT * hz, 1308 pppoe_ticker, NULL, 0); 1309 neg->timeout = PPPOE_INITIAL_TIMEOUT * 2; 1310 m0 = m_copypacket(neg->m, M_NOWAIT); 1311 NG_SEND_DATA_ONLY(error, privp->ethernet_hook, m0); 1312 } 1313 1314 static int 1315 send_acname(sessp sp, const struct pppoe_tag *tag) 1316 { 1317 int error, tlen; 1318 struct ng_mesg *msg; 1319 struct ngpppoe_sts *sts; 1320 1321 CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID); 1322 1323 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_ACNAME, 1324 sizeof(struct ngpppoe_sts), M_NOWAIT); 1325 if (msg == NULL) 1326 return (ENOMEM); 1327 1328 sts = (struct ngpppoe_sts *)msg->data; 1329 tlen = min(NG_HOOKSIZ - 1, ntohs(tag->tag_len)); 1330 strncpy(sts->hook, (const char *)(tag + 1), tlen); 1331 sts->hook[tlen] = '\0'; 1332 NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0); 1333 1334 return (error); 1335 } 1336 1337 static int 1338 send_sessionid(sessp sp) 1339 { 1340 int error; 1341 struct ng_mesg *msg; 1342 1343 CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID); 1344 1345 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_SESSIONID, 1346 sizeof(uint16_t), M_NOWAIT); 1347 if (msg == NULL) 1348 return (ENOMEM); 1349 1350 *(uint16_t *)msg->data = sp->Session_ID; 1351 NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0); 1352 1353 return (error); 1354 } 1355 1356 static int 1357 send_maxp(sessp sp, const struct pppoe_tag *tag) 1358 { 1359 int error; 1360 struct ng_mesg *msg; 1361 struct ngpppoe_maxp *maxp; 1362 1363 CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID); 1364 1365 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_SETMAXP, 1366 sizeof(struct ngpppoe_maxp), M_NOWAIT); 1367 if (msg == NULL) 1368 return (ENOMEM); 1369 1370 maxp = (struct ngpppoe_maxp *)msg->data; 1371 strncpy(maxp->hook, NG_HOOK_NAME(sp->hook), NG_HOOKSIZ); 1372 maxp->data = ntohs(((const struct maxptag *)tag)->data); 1373 NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0); 1374 1375 return (error); 1376 } 1377 1378 static int 1379 send_hurl(sessp sp, const struct pppoe_tag *tag) 1380 { 1381 int error, tlen; 1382 struct ng_mesg *msg; 1383 struct ngpppoe_padm *padm; 1384 1385 CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID); 1386 1387 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_HURL, 1388 sizeof(struct ngpppoe_padm), M_NOWAIT); 1389 if (msg == NULL) 1390 return (ENOMEM); 1391 1392 padm = (struct ngpppoe_padm *)msg->data; 1393 tlen = min(PPPOE_PADM_VALUE_SIZE - 1, ntohs(tag->tag_len)); 1394 strncpy(padm->msg, (const char *)(tag + 1), tlen); 1395 padm->msg[tlen] = '\0'; 1396 NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0); 1397 1398 return (error); 1399 } 1400 1401 static int 1402 send_motm(sessp sp, const struct pppoe_tag *tag) 1403 { 1404 int error, tlen; 1405 struct ng_mesg *msg; 1406 struct ngpppoe_padm *padm; 1407 1408 CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID); 1409 1410 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_MOTM, 1411 sizeof(struct ngpppoe_padm), M_NOWAIT); 1412 if (msg == NULL) 1413 return (ENOMEM); 1414 1415 padm = (struct ngpppoe_padm *)msg->data; 1416 tlen = min(PPPOE_PADM_VALUE_SIZE - 1, ntohs(tag->tag_len)); 1417 strncpy(padm->msg, (const char *)(tag + 1), tlen); 1418 padm->msg[tlen] = '\0'; 1419 NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0); 1420 1421 return (error); 1422 } 1423 1424 /* 1425 * Receive data from session hook and do something with it. 1426 */ 1427 static int 1428 ng_pppoe_rcvdata(hook_p hook, item_p item) 1429 { 1430 node_p node = NG_HOOK_NODE(hook); 1431 const priv_p privp = NG_NODE_PRIVATE(node); 1432 sessp sp = NG_HOOK_PRIVATE(hook); 1433 struct pppoe_full_hdr *wh; 1434 struct mbuf *m; 1435 int error; 1436 1437 CTR6(KTR_NET, "%20s: node [%x] (%p) received %p on \"%s\" (%p)", 1438 __func__, node->nd_ID, node, item, hook->hk_name, hook); 1439 1440 NGI_GET_M(item, m); 1441 switch (sp->state) { 1442 case PPPOE_NEWCONNECTED: 1443 case PPPOE_CONNECTED: { 1444 /* 1445 * Remove PPP address and control fields, if any. 1446 * For example, ng_ppp(4) always sends LCP packets 1447 * with address and control fields as required by 1448 * generic PPP. PPPoE is an exception to the rule. 1449 */ 1450 if (m->m_pkthdr.len >= 2) { 1451 if (m->m_len < 2 && !(m = m_pullup(m, 2))) 1452 LEAVE(ENOBUFS); 1453 if (mtod(m, u_char *)[0] == 0xff && 1454 mtod(m, u_char *)[1] == 0x03) 1455 m_adj(m, 2); 1456 } 1457 1458 if (V_ng_pppoe_lcp_pcp && m->m_pkthdr.len >= 2 && 1459 m->m_len >= 2 && (m = m_pullup(m, 2)) && 1460 mtod(m, uint16_t *)[0] == htons(PROT_LCP)) 1461 EVL_APPLY_PRI(m, (uint8_t)(V_ng_pppoe_lcp_pcp & 0x7)); 1462 1463 /* 1464 * Bang in a pre-made header, and set the length up 1465 * to be correct. Then send it to the ethernet driver. 1466 */ 1467 M_PREPEND(m, sizeof(*wh), M_NOWAIT); 1468 if (m == NULL) 1469 LEAVE(ENOBUFS); 1470 1471 wh = mtod(m, struct pppoe_full_hdr *); 1472 bcopy(&sp->pkt_hdr, wh, sizeof(*wh)); 1473 wh->ph.length = htons(m->m_pkthdr.len - sizeof(*wh)); 1474 NG_FWD_NEW_DATA(error, item, privp->ethernet_hook, m); 1475 privp->packets_out++; 1476 break; 1477 } 1478 case PPPOE_PRIMED: { 1479 struct { 1480 struct pppoe_tag hdr; 1481 union uniq data; 1482 } __packed uniqtag; 1483 const struct pppoe_tag *tag; 1484 struct mbuf *m0; 1485 const struct pppoe_hdr *ph; 1486 negp neg = sp->neg; 1487 uint8_t code; 1488 1489 /* 1490 * A PADI packet is being returned by the application 1491 * that has set up this hook. This indicates that it 1492 * wants us to offer service. 1493 */ 1494 if (m->m_len < sizeof(*wh)) { 1495 m = m_pullup(m, sizeof(*wh)); 1496 if (m == NULL) 1497 LEAVE(ENOBUFS); 1498 } 1499 wh = mtod(m, struct pppoe_full_hdr *); 1500 ph = &wh->ph; 1501 code = wh->ph.code; 1502 /* Use peers mode in session. */ 1503 neg->pkt->pkt_header.eh.ether_type = wh->eh.ether_type; 1504 if (code != PADI_CODE) 1505 LEAVE(EINVAL); 1506 ng_uncallout(&neg->handle, node); 1507 1508 /* 1509 * This is the first time we hear 1510 * from the client, so note it's 1511 * unicast address, replacing the 1512 * broadcast address. 1513 */ 1514 bcopy(wh->eh.ether_shost, 1515 neg->pkt->pkt_header.eh.ether_dhost, 1516 ETHER_ADDR_LEN); 1517 sp->state = PPPOE_SOFFER; 1518 neg->timeout = 0; 1519 neg->pkt->pkt_header.ph.code = PADO_CODE; 1520 1521 /* 1522 * Start working out the tags to respond with. 1523 */ 1524 uniqtag.hdr.tag_type = PTT_AC_COOKIE; 1525 uniqtag.hdr.tag_len = htons((u_int16_t)sizeof(sp)); 1526 uniqtag.data.pointer = sp; 1527 init_tags(sp); 1528 insert_tag(sp, &neg->ac_name.hdr); /* AC_NAME */ 1529 if ((tag = get_tag(ph, PTT_SRV_NAME))) 1530 insert_tag(sp, tag); /* return service */ 1531 /* 1532 * If we have a NULL service request 1533 * and have an extra service defined in this hook, 1534 * then also add a tag for the extra service. 1535 * XXX this is a hack. eventually we should be able 1536 * to support advertising many services, not just one 1537 */ 1538 if (((tag == NULL) || (tag->tag_len == 0)) && 1539 (neg->service.hdr.tag_len != 0)) { 1540 insert_tag(sp, &neg->service.hdr); /* SERVICE */ 1541 } 1542 if ((tag = get_tag(ph, PTT_HOST_UNIQ))) 1543 insert_tag(sp, tag); /* returned hostunique */ 1544 insert_tag(sp, &uniqtag.hdr); 1545 scan_tags(sp, ph); 1546 make_packet(sp); 1547 /* 1548 * Send the offer but if they don't respond 1549 * in PPPOE_OFFER_TIMEOUT seconds, forget about it. 1550 */ 1551 ng_callout(&neg->handle, node, hook, PPPOE_OFFER_TIMEOUT * hz, 1552 pppoe_ticker, NULL, 0); 1553 m0 = m_copypacket(sp->neg->m, M_NOWAIT); 1554 NG_FWD_NEW_DATA(error, item, privp->ethernet_hook, m0); 1555 privp->packets_out++; 1556 break; 1557 } 1558 1559 /* 1560 * Packets coming from the hook make no sense 1561 * to sessions in the rest of states. Throw them away. 1562 */ 1563 default: 1564 LEAVE(ENETUNREACH); 1565 } 1566 quit: 1567 if (item) 1568 NG_FREE_ITEM(item); 1569 NG_FREE_M(m); 1570 return (error); 1571 } 1572 1573 /* 1574 * Receive data from ether and do something with it. 1575 */ 1576 static int 1577 ng_pppoe_rcvdata_ether(hook_p hook, item_p item) 1578 { 1579 node_p node = NG_HOOK_NODE(hook); 1580 const priv_p privp = NG_NODE_PRIVATE(node); 1581 sessp sp; 1582 const struct pppoe_tag *utag = NULL, *tag = NULL; 1583 const struct pppoe_tag sntag = { PTT_SRV_NAME, 0 }; 1584 const struct pppoe_full_hdr *wh; 1585 const struct pppoe_hdr *ph; 1586 negp neg = NULL; 1587 struct mbuf *m; 1588 hook_p sendhook; 1589 int error = 0; 1590 uint16_t length; 1591 uint8_t code; 1592 struct mbuf *m0; 1593 1594 CTR6(KTR_NET, "%20s: node [%x] (%p) received %p on \"%s\" (%p)", 1595 __func__, node->nd_ID, node, item, hook->hk_name, hook); 1596 1597 NGI_GET_M(item, m); 1598 /* 1599 * Dig out various fields from the packet. 1600 * Use them to decide where to send it. 1601 */ 1602 privp->packets_in++; 1603 if( m->m_len < sizeof(*wh)) { 1604 m = m_pullup(m, sizeof(*wh)); /* Checks length */ 1605 if (m == NULL) { 1606 log(LOG_NOTICE, "ng_pppoe[%x]: couldn't " 1607 "m_pullup(wh)\n", node->nd_ID); 1608 LEAVE(ENOBUFS); 1609 } 1610 } 1611 wh = mtod(m, struct pppoe_full_hdr *); 1612 length = ntohs(wh->ph.length); 1613 switch(wh->eh.ether_type) { 1614 case ETHERTYPE_PPPOE_3COM_DISC: /* fall through */ 1615 case ETHERTYPE_PPPOE_DISC: 1616 /* 1617 * We need to try to make sure that the tag area 1618 * is contiguous, or we could wander off the end 1619 * of a buffer and make a mess. 1620 * (Linux wouldn't have this problem). 1621 */ 1622 if (m->m_pkthdr.len <= MHLEN) { 1623 if( m->m_len < m->m_pkthdr.len) { 1624 m = m_pullup(m, m->m_pkthdr.len); 1625 if (m == NULL) { 1626 log(LOG_NOTICE, "ng_pppoe[%x]: " 1627 "couldn't m_pullup(pkthdr)\n", 1628 node->nd_ID); 1629 LEAVE(ENOBUFS); 1630 } 1631 } 1632 } 1633 if (m->m_len != m->m_pkthdr.len) { 1634 /* 1635 * It's not all in one piece. 1636 * We need to do extra work. 1637 * Put it into a cluster. 1638 */ 1639 struct mbuf *n; 1640 n = m_dup(m, M_NOWAIT); 1641 m_freem(m); 1642 m = n; 1643 if (m) { 1644 /* just check we got a cluster */ 1645 if (m->m_len != m->m_pkthdr.len) { 1646 m_freem(m); 1647 m = NULL; 1648 } 1649 } 1650 if (m == NULL) { 1651 log(LOG_NOTICE, "ng_pppoe[%x]: packet " 1652 "fragmented\n", node->nd_ID); 1653 LEAVE(EMSGSIZE); 1654 } 1655 } 1656 wh = mtod(m, struct pppoe_full_hdr *); 1657 length = ntohs(wh->ph.length); 1658 ph = &wh->ph; 1659 code = wh->ph.code; 1660 1661 switch(code) { 1662 case PADI_CODE: 1663 /* 1664 * We are a server: 1665 * Look for a hook with the required service and send 1666 * the ENTIRE packet up there. It should come back to 1667 * a new hook in PRIMED state. Look there for further 1668 * processing. 1669 */ 1670 tag = get_tag(ph, PTT_SRV_NAME); 1671 if (tag == NULL) 1672 tag = &sntag; 1673 1674 /* 1675 * First, try to match Service-Name against our 1676 * listening hooks. If no success and we are in D-Link 1677 * compat mode and Service-Name is empty, then we 1678 * broadcast the PADI to all listening hooks. 1679 */ 1680 sendhook = pppoe_match_svc(node, tag); 1681 if (sendhook != NULL) 1682 NG_FWD_NEW_DATA(error, item, sendhook, m); 1683 else if (privp->flags & COMPAT_DLINK && 1684 ntohs(tag->tag_len) == 0) 1685 error = pppoe_broadcast_padi(node, m); 1686 else 1687 error = ENETUNREACH; 1688 break; 1689 case PADO_CODE: 1690 /* 1691 * We are a client: 1692 * Use the host_uniq tag to find the hook this is in 1693 * response to. Received #2, now send #3 1694 * For now simply accept the first we receive. 1695 */ 1696 utag = get_tag(ph, PTT_HOST_UNIQ); 1697 if (utag == NULL) { 1698 log(LOG_NOTICE, "ng_pppoe[%x]: no host " 1699 "unique field\n", node->nd_ID); 1700 LEAVE(ENETUNREACH); 1701 } 1702 1703 sendhook = pppoe_finduniq(node, utag); 1704 if (sendhook == NULL) { 1705 log(LOG_NOTICE, "ng_pppoe[%x]: no " 1706 "matching session\n", node->nd_ID); 1707 LEAVE(ENETUNREACH); 1708 } 1709 1710 /* 1711 * Check the session is in the right state. 1712 * It needs to be in PPPOE_SINIT. 1713 */ 1714 sp = NG_HOOK_PRIVATE(sendhook); 1715 if (sp->state == PPPOE_SREQ || 1716 sp->state == PPPOE_CONNECTED) { 1717 break; /* Multiple PADO is OK. */ 1718 } 1719 if (sp->state != PPPOE_SINIT) { 1720 log(LOG_NOTICE, "ng_pppoe[%x]: session " 1721 "in wrong state\n", node->nd_ID); 1722 LEAVE(ENETUNREACH); 1723 } 1724 neg = sp->neg; 1725 /* If requested specific AC-name, check it. */ 1726 if (neg->ac_name_len) { 1727 tag = get_tag(ph, PTT_AC_NAME); 1728 if (!tag) { 1729 /* No PTT_AC_NAME in PADO */ 1730 break; 1731 } 1732 if (neg->ac_name_len != htons(tag->tag_len) || 1733 strncmp(neg->ac_name.data, 1734 (const char *)(tag + 1), 1735 neg->ac_name_len) != 0) { 1736 break; 1737 } 1738 } 1739 sp->state = PPPOE_SREQ; 1740 ng_uncallout(&neg->handle, node); 1741 1742 /* 1743 * This is the first time we hear 1744 * from the server, so note it's 1745 * unicast address, replacing the 1746 * broadcast address . 1747 */ 1748 bcopy(wh->eh.ether_shost, 1749 neg->pkt->pkt_header.eh.ether_dhost, 1750 ETHER_ADDR_LEN); 1751 neg->timeout = 0; 1752 neg->pkt->pkt_header.ph.code = PADR_CODE; 1753 init_tags(sp); 1754 insert_tag(sp, utag); /* Host Unique */ 1755 if ((tag = get_tag(ph, PTT_AC_COOKIE))) 1756 insert_tag(sp, tag); /* return cookie */ 1757 if ((tag = get_tag(ph, PTT_AC_NAME))) { 1758 insert_tag(sp, tag); /* return it */ 1759 send_acname(sp, tag); 1760 } 1761 if ((tag = get_tag(ph, PTT_MAX_PAYL)) && 1762 (privp->max_payload.data != 0)) 1763 insert_tag(sp, tag); /* return it */ 1764 insert_tag(sp, &neg->service.hdr); /* Service */ 1765 scan_tags(sp, ph); 1766 make_packet(sp); 1767 sp->state = PPPOE_SREQ; 1768 ng_callout(&neg->handle, node, sp->hook, 1769 PPPOE_INITIAL_TIMEOUT * hz, 1770 pppoe_ticker, NULL, 0); 1771 neg->timeout = PPPOE_INITIAL_TIMEOUT * 2; 1772 m0 = m_copypacket(neg->m, M_NOWAIT); 1773 NG_FWD_NEW_DATA(error, item, privp->ethernet_hook, m0); 1774 break; 1775 case PADR_CODE: 1776 /* 1777 * We are a server: 1778 * Use the ac_cookie tag to find the 1779 * hook this is in response to. 1780 */ 1781 utag = get_tag(ph, PTT_AC_COOKIE); 1782 if ((utag == NULL) || 1783 (ntohs(utag->tag_len) != sizeof(sp))) { 1784 LEAVE(ENETUNREACH); 1785 } 1786 1787 sendhook = pppoe_findcookie(node, utag); 1788 if (sendhook == NULL) 1789 LEAVE(ENETUNREACH); 1790 1791 /* 1792 * Check the session is in the right state. 1793 * It needs to be in PPPOE_SOFFER or PPPOE_NEWCONNECTED. 1794 * If the latter, then this is a retry by the client, 1795 * so be nice, and resend. 1796 */ 1797 sp = NG_HOOK_PRIVATE(sendhook); 1798 if (sp->state == PPPOE_NEWCONNECTED) { 1799 /* 1800 * Whoa! drop back to resend that PADS packet. 1801 * We should still have a copy of it. 1802 */ 1803 sp->state = PPPOE_SOFFER; 1804 } else if (sp->state != PPPOE_SOFFER) 1805 LEAVE (ENETUNREACH); 1806 neg = sp->neg; 1807 ng_uncallout(&neg->handle, node); 1808 neg->pkt->pkt_header.ph.code = PADS_CODE; 1809 if (sp->Session_ID == 0) { 1810 neg->pkt->pkt_header.ph.sid = 1811 htons(pppoe_getnewsession(sp)); 1812 } 1813 send_sessionid(sp); 1814 neg->timeout = 0; 1815 /* 1816 * start working out the tags to respond with. 1817 */ 1818 init_tags(sp); 1819 insert_tag(sp, &neg->ac_name.hdr); /* AC_NAME */ 1820 if ((tag = get_tag(ph, PTT_SRV_NAME))) 1821 insert_tag(sp, tag);/* return service */ 1822 if ((tag = get_tag(ph, PTT_HOST_UNIQ))) 1823 insert_tag(sp, tag); /* return it */ 1824 insert_tag(sp, utag); /* ac_cookie */ 1825 scan_tags(sp, ph); 1826 make_packet(sp); 1827 sp->state = PPPOE_NEWCONNECTED; 1828 1829 /* Send the PADS without a timeout - we're now connected. */ 1830 m0 = m_copypacket(sp->neg->m, M_NOWAIT); 1831 NG_FWD_NEW_DATA(error, item, privp->ethernet_hook, m0); 1832 1833 /* 1834 * Having sent the last Negotiation header, 1835 * Set up the stored packet header to be correct for 1836 * the actual session. But keep the negotialtion stuff 1837 * around in case we need to resend this last packet. 1838 * We'll discard it when we move from NEWCONNECTED 1839 * to CONNECTED 1840 */ 1841 sp->pkt_hdr = neg->pkt->pkt_header; 1842 /* Configure ethertype depending on what 1843 * ethertype was used at discovery phase */ 1844 if (sp->pkt_hdr.eh.ether_type == 1845 ETHERTYPE_PPPOE_3COM_DISC) 1846 sp->pkt_hdr.eh.ether_type 1847 = ETHERTYPE_PPPOE_3COM_SESS; 1848 else 1849 sp->pkt_hdr.eh.ether_type 1850 = ETHERTYPE_PPPOE_SESS; 1851 sp->pkt_hdr.ph.code = 0; 1852 pppoe_send_event(sp, NGM_PPPOE_SUCCESS); 1853 break; 1854 case PADS_CODE: 1855 /* 1856 * We are a client: 1857 * Use the host_uniq tag to find the hook this is in 1858 * response to. Take the session ID and store it away. 1859 * Also make sure the pre-made header is correct and 1860 * set us into Session mode. 1861 */ 1862 utag = get_tag(ph, PTT_HOST_UNIQ); 1863 if (utag == NULL) { 1864 LEAVE (ENETUNREACH); 1865 } 1866 sendhook = pppoe_finduniq(node, utag); 1867 if (sendhook == NULL) 1868 LEAVE(ENETUNREACH); 1869 1870 /* 1871 * Check the session is in the right state. 1872 * It needs to be in PPPOE_SREQ. 1873 */ 1874 sp = NG_HOOK_PRIVATE(sendhook); 1875 if (sp->state != PPPOE_SREQ) 1876 LEAVE(ENETUNREACH); 1877 neg = sp->neg; 1878 ng_uncallout(&neg->handle, node); 1879 neg->pkt->pkt_header.ph.sid = wh->ph.sid; 1880 sp->Session_ID = ntohs(wh->ph.sid); 1881 pppoe_addsession(sp); 1882 send_sessionid(sp); 1883 neg->timeout = 0; 1884 sp->state = PPPOE_CONNECTED; 1885 /* 1886 * Now we have gone to Connected mode, 1887 * Free all resources needed for negotiation. 1888 * Keep a copy of the header we will be using. 1889 */ 1890 sp->pkt_hdr = neg->pkt->pkt_header; 1891 if (privp->flags & COMPAT_3COM) 1892 sp->pkt_hdr.eh.ether_type 1893 = ETHERTYPE_PPPOE_3COM_SESS; 1894 else 1895 sp->pkt_hdr.eh.ether_type 1896 = ETHERTYPE_PPPOE_SESS; 1897 sp->pkt_hdr.ph.code = 0; 1898 m_freem(neg->m); 1899 free(sp->neg, M_NETGRAPH_PPPOE); 1900 sp->neg = NULL; 1901 if ((tag = get_tag(ph, PTT_MAX_PAYL)) && 1902 (privp->max_payload.data != 0)) 1903 send_maxp(sp, tag); 1904 pppoe_send_event(sp, NGM_PPPOE_SUCCESS); 1905 break; 1906 case PADT_CODE: 1907 /* 1908 * Find matching peer/session combination. 1909 */ 1910 sp = pppoe_findsession(privp, wh); 1911 if (sp == NULL) 1912 LEAVE(ENETUNREACH); 1913 /* Disconnect that hook. */ 1914 ng_rmhook_self(sp->hook); 1915 break; 1916 case PADM_CODE: 1917 /* 1918 * We are a client: 1919 * find matching peer/session combination. 1920 */ 1921 sp = pppoe_findsession(privp, wh); 1922 if (sp == NULL) 1923 LEAVE (ENETUNREACH); 1924 if ((tag = get_tag(ph, PTT_HURL))) 1925 send_hurl(sp, tag); 1926 if ((tag = get_tag(ph, PTT_MOTM))) 1927 send_motm(sp, tag); 1928 break; 1929 default: 1930 LEAVE(EPFNOSUPPORT); 1931 } 1932 break; 1933 case ETHERTYPE_PPPOE_3COM_SESS: 1934 case ETHERTYPE_PPPOE_SESS: 1935 /* 1936 * Find matching peer/session combination. 1937 */ 1938 sp = pppoe_findsession(privp, wh); 1939 if (sp == NULL) 1940 LEAVE (ENETUNREACH); 1941 m_adj(m, sizeof(*wh)); 1942 1943 /* If packet too short, dump it. */ 1944 if (m->m_pkthdr.len < length) 1945 LEAVE(EMSGSIZE); 1946 /* Also need to trim excess at the end */ 1947 if (m->m_pkthdr.len > length) { 1948 m_adj(m, -((int)(m->m_pkthdr.len - length))); 1949 } 1950 if ( sp->state != PPPOE_CONNECTED) { 1951 if (sp->state == PPPOE_NEWCONNECTED) { 1952 sp->state = PPPOE_CONNECTED; 1953 /* 1954 * Now we have gone to Connected mode, 1955 * Free all resources needed for negotiation. 1956 * Be paranoid about whether there may be 1957 * a timeout. 1958 */ 1959 m_freem(sp->neg->m); 1960 ng_uncallout(&sp->neg->handle, node); 1961 free(sp->neg, M_NETGRAPH_PPPOE); 1962 sp->neg = NULL; 1963 } else { 1964 LEAVE (ENETUNREACH); 1965 } 1966 } 1967 NG_FWD_NEW_DATA(error, item, sp->hook, m); 1968 break; 1969 default: 1970 LEAVE(EPFNOSUPPORT); 1971 } 1972 quit: 1973 if (item) 1974 NG_FREE_ITEM(item); 1975 NG_FREE_M(m); 1976 return (error); 1977 } 1978 1979 /* 1980 * Receive data from debug hook and bypass it to ether. 1981 */ 1982 static int 1983 ng_pppoe_rcvdata_debug(hook_p hook, item_p item) 1984 { 1985 node_p node = NG_HOOK_NODE(hook); 1986 const priv_p privp = NG_NODE_PRIVATE(node); 1987 int error; 1988 1989 CTR6(KTR_NET, "%20s: node [%x] (%p) received %p on \"%s\" (%p)", 1990 __func__, node->nd_ID, node, item, hook->hk_name, hook); 1991 1992 NG_FWD_ITEM_HOOK(error, item, privp->ethernet_hook); 1993 privp->packets_out++; 1994 return (error); 1995 } 1996 1997 /* 1998 * Do local shutdown processing.. 1999 * If we are a persistent device, we might refuse to go away, and 2000 * we'd only remove our links and reset ourself. 2001 */ 2002 static int 2003 ng_pppoe_shutdown(node_p node) 2004 { 2005 const priv_p privp = NG_NODE_PRIVATE(node); 2006 int i; 2007 2008 for (i = 0; i < SESSHASHSIZE; i++) 2009 mtx_destroy(&privp->sesshash[i].mtx); 2010 NG_NODE_SET_PRIVATE(node, NULL); 2011 NG_NODE_UNREF(privp->node); 2012 free(privp, M_NETGRAPH_PPPOE); 2013 return (0); 2014 } 2015 2016 /* 2017 * Hook disconnection 2018 * 2019 * Clean up all dangling links and information about the session/hook. 2020 * For this type, removal of the last link destroys the node. 2021 */ 2022 static int 2023 ng_pppoe_disconnect(hook_p hook) 2024 { 2025 node_p node = NG_HOOK_NODE(hook); 2026 priv_p privp = NG_NODE_PRIVATE(node); 2027 sessp sp; 2028 2029 if (hook == privp->debug_hook) { 2030 privp->debug_hook = NULL; 2031 } else if (hook == privp->ethernet_hook) { 2032 privp->ethernet_hook = NULL; 2033 if (NG_NODE_IS_VALID(node)) 2034 ng_rmnode_self(node); 2035 } else { 2036 sp = NG_HOOK_PRIVATE(hook); 2037 if (sp->state != PPPOE_SNONE ) { 2038 pppoe_send_event(sp, NGM_PPPOE_CLOSE); 2039 } 2040 /* 2041 * According to the spec, if we are connected, 2042 * we should send a DISC packet if we are shutting down 2043 * a session. 2044 */ 2045 if ((privp->ethernet_hook) 2046 && ((sp->state == PPPOE_CONNECTED) 2047 || (sp->state == PPPOE_NEWCONNECTED))) { 2048 struct mbuf *m; 2049 2050 /* Generate a packet of that type. */ 2051 m = m_gethdr(M_NOWAIT, MT_DATA); 2052 if (m == NULL) 2053 log(LOG_NOTICE, "ng_pppoe[%x]: session out of " 2054 "mbufs\n", node->nd_ID); 2055 else { 2056 struct epoch_tracker et; 2057 struct pppoe_full_hdr *wh; 2058 struct pppoe_tag *tag; 2059 int msglen = strlen(SIGNOFF); 2060 int error = 0; 2061 2062 wh = mtod(m, struct pppoe_full_hdr *); 2063 bcopy(&sp->pkt_hdr, wh, sizeof(*wh)); 2064 2065 /* Revert the stored header to DISC/PADT mode. */ 2066 wh->ph.code = PADT_CODE; 2067 /* 2068 * Configure ethertype depending on what 2069 * was used during sessions stage. 2070 */ 2071 if (wh->eh.ether_type == 2072 ETHERTYPE_PPPOE_3COM_SESS) 2073 wh->eh.ether_type = ETHERTYPE_PPPOE_3COM_DISC; 2074 else 2075 wh->eh.ether_type = ETHERTYPE_PPPOE_DISC; 2076 /* 2077 * Add a General error message and adjust 2078 * sizes. 2079 */ 2080 tag = (void *)(&wh->ph + 1); 2081 tag->tag_type = PTT_GEN_ERR; 2082 tag->tag_len = htons((u_int16_t)msglen); 2083 strncpy((char *)(tag + 1), SIGNOFF, msglen); 2084 m->m_pkthdr.len = m->m_len = sizeof(*wh) + sizeof(*tag) + 2085 msglen; 2086 wh->ph.length = htons(sizeof(*tag) + msglen); 2087 2088 NET_EPOCH_ENTER(et); 2089 NG_SEND_DATA_ONLY(error, 2090 privp->ethernet_hook, m); 2091 NET_EPOCH_EXIT(et); 2092 } 2093 } 2094 if (sp->state == PPPOE_LISTENING) 2095 LIST_REMOVE(sp, sessions); 2096 else if (sp->Session_ID) 2097 pppoe_delsession(sp); 2098 /* 2099 * As long as we have somewhere to store the timeout handle, 2100 * we may have a timeout pending.. get rid of it. 2101 */ 2102 if (sp->neg) { 2103 ng_uncallout(&sp->neg->handle, node); 2104 if (sp->neg->m) 2105 m_freem(sp->neg->m); 2106 free(sp->neg, M_NETGRAPH_PPPOE); 2107 } 2108 free(sp, M_NETGRAPH_PPPOE); 2109 NG_HOOK_SET_PRIVATE(hook, NULL); 2110 } 2111 if ((NG_NODE_NUMHOOKS(node) == 0) && 2112 (NG_NODE_IS_VALID(node))) 2113 ng_rmnode_self(node); 2114 return (0); 2115 } 2116 2117 /* 2118 * Timeouts come here. 2119 */ 2120 static void 2121 pppoe_ticker(node_p node, hook_p hook, void *arg1, int arg2) 2122 { 2123 priv_p privp = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 2124 sessp sp = NG_HOOK_PRIVATE(hook); 2125 negp neg = sp->neg; 2126 struct mbuf *m0 = NULL; 2127 int error = 0; 2128 2129 CTR6(KTR_NET, "%20s: node [%x] (%p) hook \"%s\" (%p) session %d", 2130 __func__, node->nd_ID, node, hook->hk_name, hook, sp->Session_ID); 2131 switch(sp->state) { 2132 /* 2133 * Resend the last packet, using an exponential backoff. 2134 * After a period of time, stop growing the backoff, 2135 * And either leave it, or revert to the start. 2136 */ 2137 case PPPOE_SINIT: 2138 case PPPOE_SREQ: 2139 /* Timeouts on these produce resends. */ 2140 m0 = m_copypacket(sp->neg->m, M_NOWAIT); 2141 NG_SEND_DATA_ONLY( error, privp->ethernet_hook, m0); 2142 ng_callout(&neg->handle, node, hook, neg->timeout * hz, 2143 pppoe_ticker, NULL, 0); 2144 if ((neg->timeout <<= 1) > PPPOE_TIMEOUT_LIMIT) { 2145 if (sp->state == PPPOE_SREQ) { 2146 /* Revert to SINIT mode. */ 2147 pppoe_start(sp); 2148 } else { 2149 neg->timeout = PPPOE_TIMEOUT_LIMIT; 2150 } 2151 } 2152 break; 2153 case PPPOE_PRIMED: 2154 case PPPOE_SOFFER: 2155 /* A timeout on these says "give up" */ 2156 ng_rmhook_self(hook); 2157 break; 2158 default: 2159 /* Timeouts have no meaning in other states. */ 2160 log(LOG_NOTICE, "ng_pppoe[%x]: unexpected timeout\n", 2161 node->nd_ID); 2162 } 2163 } 2164 2165 /* 2166 * Parse an incoming packet to see if any tags should be copied to the 2167 * output packet. Don't do any tags that have been handled in the main 2168 * state machine. 2169 */ 2170 static const struct pppoe_tag* 2171 scan_tags(sessp sp, const struct pppoe_hdr* ph) 2172 { 2173 const char *const end = (const char *)next_tag(ph); 2174 const char *ptn; 2175 const struct pppoe_tag *pt = (const void *)(ph + 1); 2176 2177 /* 2178 * Keep processing tags while a tag header will still fit. 2179 */ 2180 CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID); 2181 2182 while((const char*)(pt + 1) <= end) { 2183 /* 2184 * If the tag data would go past the end of the packet, abort. 2185 */ 2186 ptn = (((const char *)(pt + 1)) + ntohs(pt->tag_len)); 2187 if(ptn > end) 2188 return NULL; 2189 2190 switch (pt->tag_type) { 2191 case PTT_RELAY_SID: 2192 insert_tag(sp, pt); 2193 break; 2194 case PTT_EOL: 2195 return NULL; 2196 case PTT_SRV_NAME: 2197 case PTT_AC_NAME: 2198 case PTT_HOST_UNIQ: 2199 case PTT_AC_COOKIE: 2200 case PTT_VENDOR: 2201 case PTT_SRV_ERR: 2202 case PTT_SYS_ERR: 2203 case PTT_GEN_ERR: 2204 case PTT_MAX_PAYL: 2205 case PTT_HURL: 2206 case PTT_MOTM: 2207 break; 2208 } 2209 pt = (const struct pppoe_tag*)ptn; 2210 } 2211 return NULL; 2212 } 2213 2214 static int 2215 pppoe_send_event(sessp sp, enum cmd cmdid) 2216 { 2217 int error; 2218 struct ng_mesg *msg; 2219 struct ngpppoe_sts *sts; 2220 2221 CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID); 2222 2223 NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, cmdid, 2224 sizeof(struct ngpppoe_sts), M_NOWAIT); 2225 if (msg == NULL) 2226 return (ENOMEM); 2227 sts = (struct ngpppoe_sts *)msg->data; 2228 strncpy(sts->hook, NG_HOOK_NAME(sp->hook), NG_HOOKSIZ); 2229 NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0); 2230 return (error); 2231 } 2232