ppp_oe.cpp

00001 /*****************************************************************************
00002 * ppp_oe.c - PPP Over Ethernet implementation for lwIP.
00003 *
00004 * Copyright (c) 2006 by Marc Boucher, Services Informatiques (MBSI) inc.
00005 *
00006 * The authors hereby grant permission to use, copy, modify, distribute,
00007 * and license this software and its documentation for any purpose, provided
00008 * that existing copyright notices are retained in all copies and that this
00009 * notice and the following disclaimer are included verbatim in any 
00010 * distributions. No written agreement, license, or royalty fee is required
00011 * for any of the authorized uses.
00012 *
00013 * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS *AS IS* AND ANY EXPRESS OR
00014 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
00015 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 
00016 * IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
00017 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
00018 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
00019 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
00020 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
00021 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
00022 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00023 *
00024 ******************************************************************************
00025 * REVISION HISTORY
00026 *
00027 * 06-01-01 Marc Boucher <marc@mbsi.ca>
00028 *   Ported to lwIP.
00029 *****************************************************************************/
00030 
00031 
00032 
00033 /* based on NetBSD: if_pppoe.c,v 1.64 2006/01/31 23:50:15 martin Exp */
00034 
00035 /*-
00036  * Copyright (c) 2002 The NetBSD Foundation, Inc.
00037  * All rights reserved.
00038  *
00039  * This code is derived from software contributed to The NetBSD Foundation
00040  * by Martin Husemann <martin@NetBSD.org>.
00041  *
00042  * Redistribution and use in source and binary forms, with or without
00043  * modification, are permitted provided that the following conditions
00044  * are met:
00045  * 1. Redistributions of source code must retain the above copyright
00046  *    notice, this list of conditions and the following disclaimer.
00047  * 2. Redistributions in binary form must reproduce the above copyright
00048  *    notice, this list of conditions and the following disclaimer in the
00049  *    documentation and/or other materials provided with the distribution.
00050  * 3. All advertising materials mentioning features or use of this software
00051  *    must display the following acknowledgement:
00052  *        This product includes software developed by the NetBSD
00053  *        Foundation, Inc. and its contributors.
00054  * 4. Neither the name of The NetBSD Foundation nor the names of its
00055  *    contributors may be used to endorse or promote products derived
00056  *    from this software without specific prior written permission.
00057  *
00058  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
00059  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
00060  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
00061  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
00062  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
00063  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
00064  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
00065  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
00066  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
00067  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
00068  * POSSIBILITY OF SUCH DAMAGE.
00069  */
00070 
00071 #include "lwip/opt.h"
00072 
00073 #if PPPOE_SUPPORT /* don't build if not configured for use in lwipopts.h */
00074 
00075 #include "ppp.h"
00076 #include "pppdebug.h"
00077 
00078 #include "lwip/timers.h"
00079 
00080 #include "netif/ppp_oe.h"
00081 
00082 #include <string.h>
00083 #include <stdio.h>
00084 
00085 /** @todo Replace this part with a simple list like other lwIP lists */
00086 #ifndef _SYS_QUEUE_H_
00087 #define _SYS_QUEUE_H_
00088 
00089 /*
00090  * A list is headed by a single forward pointer (or an array of forward
00091  * pointers for a hash table header). The elements are doubly linked
00092  * so that an arbitrary element can be removed without a need to
00093  * traverse the list. New elements can be added to the list before
00094  * or after an existing element or at the head of the list. A list
00095  * may only be traversed in the forward direction.
00096  *
00097  * For details on the use of these macros, see the queue(3) manual page.
00098  */
00099 
00100 /*
00101  * List declarations.
00102  */
00103 #define  LIST_HEAD(name, type)                                                 \
00104 struct name {                                                                  \
00105   struct type *lh_first;  /* first element */                                  \
00106 }
00107 
00108 #define  LIST_HEAD_INITIALIZER(head)                                           \
00109   { NULL }
00110 
00111 #define  LIST_ENTRY(type)                                                      \
00112 struct {                                                                       \
00113   struct type *le_next;  /* next element */                                    \
00114   struct type **le_prev; /* address of previous next element */                \
00115 }
00116 
00117 /*
00118  * List functions.
00119  */
00120 
00121 #define  LIST_EMPTY(head)  ((head)->lh_first == NULL)
00122 
00123 #define  LIST_FIRST(head)  ((head)->lh_first)
00124 
00125 #define  LIST_FOREACH(var, head, field)                                        \
00126   for ((var) = LIST_FIRST((head));                                             \
00127       (var);                                                                   \
00128       (var) = LIST_NEXT((var), field))
00129 
00130 #define  LIST_INIT(head) do {                                                  \
00131   LIST_FIRST((head)) = NULL;                                                   \
00132 } while (0)
00133 
00134 #define  LIST_INSERT_AFTER(listelm, elm, field) do {                           \
00135   if ((LIST_NEXT((elm), field) = LIST_NEXT((listelm), field)) != NULL)         \
00136     LIST_NEXT((listelm), field)->field.le_prev =                               \
00137         &LIST_NEXT((elm), field);                                              \
00138   LIST_NEXT((listelm), field) = (elm);                                         \
00139   (elm)->field.le_prev = &LIST_NEXT((listelm), field);                         \
00140 } while (0)
00141 
00142 #define  LIST_INSERT_BEFORE(listelm, elm, field) do {                          \
00143   (elm)->field.le_prev = (listelm)->field.le_prev;                             \
00144   LIST_NEXT((elm), field) = (listelm);                                         \
00145   *(listelm)->field.le_prev = (elm);                                           \
00146   (listelm)->field.le_prev = &LIST_NEXT((elm), field);                         \
00147 } while (0)
00148 
00149 #define  LIST_INSERT_HEAD(head, elm, field) do {                               \
00150   if ((LIST_NEXT((elm), field) = LIST_FIRST((head))) != NULL)                  \
00151     LIST_FIRST((head))->field.le_prev = &LIST_NEXT((elm), field);              \
00152   LIST_FIRST((head)) = (elm);                                                  \
00153   (elm)->field.le_prev = &LIST_FIRST((head));                                  \
00154 } while (0)
00155 
00156 #define  LIST_NEXT(elm, field)  ((elm)->field.le_next)
00157 
00158 #define  LIST_REMOVE(elm, field) do {                                          \
00159   if (LIST_NEXT((elm), field) != NULL)                                         \
00160     LIST_NEXT((elm), field)->field.le_prev =                                   \
00161         (elm)->field.le_prev;                                                  \
00162   *(elm)->field.le_prev = LIST_NEXT((elm), field);                             \
00163 } while (0)
00164 
00165 #endif /* !_SYS_QUEUE_H_ */
00166 
00167 
00168 /* Add a 16 bit unsigned value to a buffer pointed to by PTR */
00169 #define PPPOE_ADD_16(PTR, VAL) \
00170     *(PTR)++ = (u8_t)((VAL) / 256);    \
00171     *(PTR)++ = (u8_t)((VAL) % 256)
00172 
00173 /* Add a complete PPPoE header to the buffer pointed to by PTR */
00174 #define PPPOE_ADD_HEADER(PTR, CODE, SESS, LEN)  \
00175     *(PTR)++ = PPPOE_VERTYPE;  \
00176     *(PTR)++ = (CODE);         \
00177     PPPOE_ADD_16(PTR, SESS);   \
00178     PPPOE_ADD_16(PTR, LEN)
00179 
00180 #define PPPOE_DISC_TIMEOUT (5*1000)  /* base for quick timeout calculation */
00181 #define PPPOE_SLOW_RETRY   (60*1000) /* persistent retry interval */
00182 #define PPPOE_DISC_MAXPADI  4        /* retry PADI four times (quickly) */
00183 #define PPPOE_DISC_MAXPADR  2        /* retry PADR twice */
00184 
00185 #ifdef PPPOE_SERVER
00186 #error "PPPOE_SERVER is not yet supported under lwIP!"
00187 /* from if_spppsubr.c */
00188 #define IFF_PASSIVE IFF_LINK0 /* wait passively for connection */
00189 #endif
00190 
00191 struct pppoe_softc {
00192   LIST_ENTRY(pppoe_softc) sc_list;
00193   struct netif *sc_ethif;      /* ethernet interface we are using */
00194   int sc_pd;                   /* ppp unit number */
00195   void (*sc_linkStatusCB)(int pd, int up);
00196 
00197   int sc_state;                /* discovery phase or session connected */
00198   struct eth_addr sc_dest;     /* hardware address of concentrator */
00199   u16_t sc_session;            /* PPPoE session id */
00200 
00201   char *sc_service_name;       /* if != NULL: requested name of service */
00202   char *sc_concentrator_name;  /* if != NULL: requested concentrator id */
00203   u8_t *sc_ac_cookie;          /* content of AC cookie we must echo back */
00204   size_t sc_ac_cookie_len;     /* length of cookie data */
00205 #ifdef PPPOE_SERVER
00206   u8_t *sc_hunique;            /* content of host unique we must echo back */
00207   size_t sc_hunique_len;       /* length of host unique */
00208 #endif
00209   int sc_padi_retried;         /* number of PADI retries already done */
00210   int sc_padr_retried;         /* number of PADR retries already done */
00211 };
00212 
00213 /* input routines */
00214 static void pppoe_dispatch_disc_pkt(struct netif *, struct pbuf *);
00215 
00216 /* management routines */
00217 static int pppoe_do_disconnect(struct pppoe_softc *);
00218 static void pppoe_abort_connect(struct pppoe_softc *);
00219 static void pppoe_clear_softc(struct pppoe_softc *, const char *);
00220 
00221 /* internal timeout handling */
00222 static void pppoe_timeout(void *);
00223 
00224 /* sending actual protocol controll packets */
00225 static err_t pppoe_send_padi(struct pppoe_softc *);
00226 static err_t pppoe_send_padr(struct pppoe_softc *);
00227 #ifdef PPPOE_SERVER
00228 static err_t pppoe_send_pado(struct pppoe_softc *);
00229 static err_t pppoe_send_pads(struct pppoe_softc *);
00230 #endif
00231 static err_t pppoe_send_padt(struct netif *, u_int, const u8_t *);
00232 
00233 /* internal helper functions */
00234 static struct pppoe_softc * pppoe_find_softc_by_session(u_int, struct netif *);
00235 static struct pppoe_softc * pppoe_find_softc_by_hunique(u8_t *, size_t, struct netif *);
00236 
00237 static LIST_HEAD(pppoe_softc_head, pppoe_softc) pppoe_softc_list;
00238 
00239 void
00240 pppoe_init(void)
00241 {
00242   LIST_INIT(&pppoe_softc_list);
00243 }
00244 
00245 err_t
00246 pppoe_create(struct netif *ethif, int pd, void (*linkStatusCB)(int pd, int up), struct pppoe_softc **scptr)
00247 {
00248   struct pppoe_softc *sc;
00249 
00250   sc = mem_malloc(sizeof(struct pppoe_softc));
00251   if(!sc) {
00252     *scptr = NULL;
00253     return ERR_MEM;
00254   }
00255   memset(sc, 0, sizeof(struct pppoe_softc));
00256 
00257   /* changed to real address later */
00258   MEMCPY(&sc->sc_dest, ethbroadcast.addr, sizeof(sc->sc_dest));
00259 
00260   sc->sc_pd = pd;
00261   sc->sc_linkStatusCB = linkStatusCB;
00262   sc->sc_ethif = ethif;
00263 
00264   LIST_INSERT_HEAD(&pppoe_softc_list, sc, sc_list);
00265 
00266   *scptr = sc;
00267 
00268   return ERR_OK;
00269 }
00270 
00271 err_t
00272 pppoe_destroy(struct netif *ifp)
00273 {
00274   struct pppoe_softc * sc;
00275 
00276   LIST_FOREACH(sc, &pppoe_softc_list, sc_list) {
00277     if (sc->sc_ethif == ifp) {
00278       break;
00279     }
00280   }
00281 
00282   if(!(sc && (sc->sc_ethif == ifp))) {
00283     return ERR_IF;
00284   }
00285 
00286   sys_untimeout(pppoe_timeout, sc);
00287   LIST_REMOVE(sc, sc_list);
00288 
00289   if (sc->sc_concentrator_name) {
00290     mem_free(sc->sc_concentrator_name);
00291   }
00292   if (sc->sc_service_name) {
00293     mem_free(sc->sc_service_name);
00294   }
00295   if (sc->sc_ac_cookie) {
00296     mem_free(sc->sc_ac_cookie);
00297   }
00298   mem_free(sc);
00299 
00300   return ERR_OK;
00301 }
00302 
00303 /*
00304  * Find the interface handling the specified session.
00305  * Note: O(number of sessions open), this is a client-side only, mean
00306  * and lean implementation, so number of open sessions typically should
00307  * be 1.
00308  */
00309 static struct pppoe_softc *
00310 pppoe_find_softc_by_session(u_int session, struct netif *rcvif)
00311 {
00312   struct pppoe_softc *sc;
00313 
00314   if (session == 0) {
00315     return NULL;
00316   }
00317 
00318   LIST_FOREACH(sc, &pppoe_softc_list, sc_list) {
00319     if (sc->sc_state == PPPOE_STATE_SESSION
00320         && sc->sc_session == session) {
00321       if (sc->sc_ethif == rcvif) {
00322         return sc;
00323       } else {
00324         return NULL;
00325       }
00326     }
00327   }
00328   return NULL;
00329 }
00330 
00331 /* Check host unique token passed and return appropriate softc pointer,
00332  * or NULL if token is bogus. */
00333 static struct pppoe_softc *
00334 pppoe_find_softc_by_hunique(u8_t *token, size_t len, struct netif *rcvif)
00335 {
00336   struct pppoe_softc *sc, *t;
00337 
00338   if (LIST_EMPTY(&pppoe_softc_list)) {
00339     return NULL;
00340   }
00341 
00342   if (len != sizeof sc) {
00343     return NULL;
00344   }
00345   MEMCPY(&t, token, len);
00346 
00347   LIST_FOREACH(sc, &pppoe_softc_list, sc_list) {
00348     if (sc == t) {
00349       break;
00350     }
00351   }
00352 
00353   if (sc == NULL) {
00354     PPPDEBUG(LOG_DEBUG, ("pppoe: alien host unique tag, no session found\n"));
00355     return NULL;
00356   }
00357 
00358   /* should be safe to access *sc now */
00359   if (sc->sc_state < PPPOE_STATE_PADI_SENT || sc->sc_state >= PPPOE_STATE_SESSION) {
00360     printf("%c%c%"U16_F": host unique tag found, but it belongs to a connection in state %d\n",
00361       sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num, sc->sc_state);
00362     return NULL;
00363   }
00364   if (sc->sc_ethif != rcvif) {
00365     printf("%c%c%"U16_F": wrong interface, not accepting host unique\n",
00366       sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num);
00367     return NULL;
00368   }
00369   return sc;
00370 }
00371 
00372 static void
00373 pppoe_linkstatus_up(struct pppoe_softc *sc)
00374 {
00375   sc->sc_linkStatusCB(sc->sc_pd, 1);
00376 }
00377 
00378 /* analyze and handle a single received packet while not in session state */
00379 static void
00380 pppoe_dispatch_disc_pkt(struct netif *netif, struct pbuf *pb)
00381 {
00382   u16_t tag, len;
00383   u16_t session, plen;
00384   struct pppoe_softc *sc;
00385   const char *err_msg;
00386   char devname[6];
00387   char *error;
00388   u8_t *ac_cookie;
00389   u16_t ac_cookie_len;
00390 #ifdef PPPOE_SERVER
00391   u8_t *hunique;
00392   size_t hunique_len;
00393 #endif
00394   struct pppoehdr *ph;
00395   struct pppoetag pt;
00396   int off, err, errortag;
00397   struct eth_hdr *ethhdr;
00398 
00399   pb = pppSingleBuf(pb);
00400 
00401   strcpy(devname, "pppoe");  /* as long as we don't know which instance */
00402   err_msg = NULL;
00403   errortag = 0;
00404   if (pb->len < sizeof(*ethhdr)) {
00405     goto done;
00406   }
00407   ethhdr = (struct eth_hdr *)pb->payload;
00408   off = sizeof(*ethhdr);
00409 
00410   ac_cookie = NULL;
00411   ac_cookie_len = 0;
00412 #ifdef PPPOE_SERVER
00413   hunique = NULL;
00414   hunique_len = 0;
00415 #endif
00416   session = 0;
00417   if (pb->len - off < PPPOE_HEADERLEN) {
00418     printf("pppoe: packet too short: %d\n", pb->len);
00419     goto done;
00420   }
00421 
00422   ph = (struct pppoehdr *) (ethhdr + 1);
00423   if (ph->vertype != PPPOE_VERTYPE) {
00424     printf("pppoe: unknown version/type packet: 0x%x\n", ph->vertype);
00425     goto done;
00426   }
00427   session = ntohs(ph->session);
00428   plen = ntohs(ph->plen);
00429   off += sizeof(*ph);
00430 
00431   if (plen + off > pb->len) {
00432     printf("pppoe: packet content does not fit: data available = %d, packet size = %u\n",
00433         pb->len - off, plen);
00434     goto done;
00435   }
00436   if(pb->tot_len == pb->len) {
00437     pb->tot_len = pb->len = (u16_t)off + plen; /* ignore trailing garbage */
00438   }
00439   tag = 0;
00440   len = 0;
00441   sc = NULL;
00442   while (off + sizeof(pt) <= pb->len) {
00443     MEMCPY(&pt, (u8_t*)pb->payload + off, sizeof(pt));
00444     tag = ntohs(pt.tag);
00445     len = ntohs(pt.len);
00446     if (off + sizeof(pt) + len > pb->len) {
00447       printf("pppoe: tag 0x%x len 0x%x is too long\n", tag, len);
00448       goto done;
00449     }
00450     switch (tag) {
00451       case PPPOE_TAG_EOL:
00452         goto breakbreak;
00453       case PPPOE_TAG_SNAME:
00454         break;  /* ignored */
00455       case PPPOE_TAG_ACNAME:
00456         break;  /* ignored */
00457       case PPPOE_TAG_HUNIQUE:
00458         if (sc != NULL) {
00459           break;
00460         }
00461 #ifdef PPPOE_SERVER
00462         hunique = (u8_t*)pb->payload + off + sizeof(pt);
00463         hunique_len = len;
00464 #endif
00465         sc = pppoe_find_softc_by_hunique((u8_t*)pb->payload + off + sizeof(pt), len, netif);
00466         if (sc != NULL) {
00467           snprintf(devname, sizeof(devname), "%c%c%"U16_F, sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num);
00468         }
00469         break;
00470       case PPPOE_TAG_ACCOOKIE:
00471         if (ac_cookie == NULL) {
00472           ac_cookie = (u8_t*)pb->payload + off + sizeof(pt);
00473           ac_cookie_len = len;
00474         }
00475         break;
00476       case PPPOE_TAG_SNAME_ERR:
00477         err_msg = "SERVICE NAME ERROR";
00478         errortag = 1;
00479         break;
00480       case PPPOE_TAG_ACSYS_ERR:
00481         err_msg = "AC SYSTEM ERROR";
00482         errortag = 1;
00483         break;
00484       case PPPOE_TAG_GENERIC_ERR:
00485         err_msg = "GENERIC ERROR";
00486         errortag = 1;
00487         break;
00488     }
00489     if (err_msg) {
00490       error = NULL;
00491       if (errortag && len) {
00492         error = mem_malloc(len+1);
00493         if (error) {
00494           strncpy(error, (char*)pb->payload + off + sizeof(pt), len);
00495           error[len-1] = '\0';
00496         }
00497       }
00498       if (error) {
00499         printf("%s: %s: %s\n", devname, err_msg, error);
00500         mem_free(error);
00501       } else {
00502         printf("%s: %s\n", devname, err_msg);
00503       }
00504       if (errortag) {
00505         goto done;
00506       }
00507     }
00508     off += sizeof(pt) + len;
00509   }
00510 
00511 breakbreak:;
00512   switch (ph->code) {
00513     case PPPOE_CODE_PADI:
00514 #ifdef PPPOE_SERVER
00515       /*
00516        * got service name, concentrator name, and/or host unique.
00517        * ignore if we have no interfaces with IFF_PASSIVE|IFF_UP.
00518        */
00519       if (LIST_EMPTY(&pppoe_softc_list)) {
00520         goto done;
00521       }
00522       LIST_FOREACH(sc, &pppoe_softc_list, sc_list) {
00523         if (!(sc->sc_sppp.pp_if.if_flags & IFF_UP)) {
00524           continue;
00525         }
00526         if (!(sc->sc_sppp.pp_if.if_flags & IFF_PASSIVE)) {
00527           continue;
00528         }
00529         if (sc->sc_state == PPPOE_STATE_INITIAL) {
00530           break;
00531         }
00532       }
00533       if (sc == NULL) {
00534         /* printf("pppoe: free passive interface is not found\n"); */
00535         goto done;
00536       }
00537       if (hunique) {
00538         if (sc->sc_hunique) {
00539           mem_free(sc->sc_hunique);
00540         }
00541         sc->sc_hunique = mem_malloc(hunique_len);
00542         if (sc->sc_hunique == NULL) {
00543           goto done;
00544         }
00545         sc->sc_hunique_len = hunique_len;
00546         MEMCPY(sc->sc_hunique, hunique, hunique_len);
00547       }
00548       MEMCPY(&sc->sc_dest, eh->ether_shost, sizeof sc->sc_dest);
00549       sc->sc_state = PPPOE_STATE_PADO_SENT;
00550       pppoe_send_pado(sc);
00551       break;
00552 #endif /* PPPOE_SERVER */
00553     case PPPOE_CODE_PADR:
00554 #ifdef PPPOE_SERVER
00555       /*
00556        * get sc from ac_cookie if IFF_PASSIVE
00557        */
00558       if (ac_cookie == NULL) {
00559         /* be quiet if there is not a single pppoe instance */
00560         printf("pppoe: received PADR but not includes ac_cookie\n");
00561         goto done;
00562       }
00563       sc = pppoe_find_softc_by_hunique(ac_cookie, ac_cookie_len, netif);
00564       if (sc == NULL) {
00565         /* be quiet if there is not a single pppoe instance */
00566         if (!LIST_EMPTY(&pppoe_softc_list)) {
00567           printf("pppoe: received PADR but could not find request for it\n");
00568         }
00569         goto done;
00570       }
00571       if (sc->sc_state != PPPOE_STATE_PADO_SENT) {
00572         printf("%c%c%"U16_F": received unexpected PADR\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num);
00573         goto done;
00574       }
00575       if (hunique) {
00576         if (sc->sc_hunique) {
00577           mem_free(sc->sc_hunique);
00578         }
00579         sc->sc_hunique = mem_malloc(hunique_len);
00580         if (sc->sc_hunique == NULL) {
00581           goto done;
00582         }
00583         sc->sc_hunique_len = hunique_len;
00584         MEMCPY(sc->sc_hunique, hunique, hunique_len);
00585       }
00586       pppoe_send_pads(sc);
00587       sc->sc_state = PPPOE_STATE_SESSION;
00588       pppoe_linkstatus_up(sc); /* notify upper layers */
00589       break;
00590 #else
00591       /* ignore, we are no access concentrator */
00592       goto done;
00593 #endif /* PPPOE_SERVER */
00594     case PPPOE_CODE_PADO:
00595       if (sc == NULL) {
00596         /* be quiet if there is not a single pppoe instance */
00597         if (!LIST_EMPTY(&pppoe_softc_list)) {
00598           printf("pppoe: received PADO but could not find request for it\n");
00599         }
00600         goto done;
00601       }
00602       if (sc->sc_state != PPPOE_STATE_PADI_SENT) {
00603         printf("%c%c%"U16_F": received unexpected PADO\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num);
00604         goto done;
00605       }
00606       if (ac_cookie) {
00607         if (sc->sc_ac_cookie) {
00608           mem_free(sc->sc_ac_cookie);
00609         }
00610         sc->sc_ac_cookie = mem_malloc(ac_cookie_len);
00611         if (sc->sc_ac_cookie == NULL) {
00612           goto done;
00613         }
00614         sc->sc_ac_cookie_len = ac_cookie_len;
00615         MEMCPY(sc->sc_ac_cookie, ac_cookie, ac_cookie_len);
00616       }
00617       MEMCPY(&sc->sc_dest, ethhdr->src.addr, sizeof(sc->sc_dest.addr));
00618       sys_untimeout(pppoe_timeout, sc);
00619       sc->sc_padr_retried = 0;
00620       sc->sc_state = PPPOE_STATE_PADR_SENT;
00621       if ((err = pppoe_send_padr(sc)) != 0) {
00622         PPPDEBUG(LOG_DEBUG, ("pppoe: %c%c%"U16_F": failed to send PADR, error=%d\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num, err));
00623       }
00624       sys_timeout(PPPOE_DISC_TIMEOUT * (1 + sc->sc_padr_retried), pppoe_timeout, sc);
00625       break;
00626     case PPPOE_CODE_PADS:
00627       if (sc == NULL) {
00628         goto done;
00629       }
00630       sc->sc_session = session;
00631       sys_untimeout(pppoe_timeout, sc);
00632       PPPDEBUG(LOG_DEBUG, ("pppoe: %c%c%"U16_F": session 0x%x connected\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num, session));
00633       sc->sc_state = PPPOE_STATE_SESSION;
00634       pppoe_linkstatus_up(sc); /* notify upper layers */
00635       break;
00636     case PPPOE_CODE_PADT:
00637       if (sc == NULL) {
00638         goto done;
00639       }
00640       pppoe_clear_softc(sc, "received PADT");
00641       break;
00642     default:
00643       if(sc) {
00644         printf("%c%c%"U16_F": unknown code (0x%"X16_F") session = 0x%"X16_F"\n",
00645             sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num,
00646             (u16_t)ph->code, session);
00647       } else {
00648         printf("pppoe: unknown code (0x%"X16_F") session = 0x%"X16_F"\n", (u16_t)ph->code, session);
00649       }
00650       break;
00651   }
00652 
00653 done:
00654   pbuf_free(pb);
00655   return;
00656 }
00657 
00658 void
00659 pppoe_disc_input(struct netif *netif, struct pbuf *p)
00660 {
00661   /* avoid error messages if there is not a single pppoe instance */
00662   if (!LIST_EMPTY(&pppoe_softc_list)) {
00663     pppoe_dispatch_disc_pkt(netif, p);
00664   } else {
00665     pbuf_free(p);
00666   }
00667 }
00668 
00669 void
00670 pppoe_data_input(struct netif *netif, struct pbuf *pb)
00671 {
00672   u16_t session, plen;
00673   struct pppoe_softc *sc;
00674   struct pppoehdr *ph;
00675 #ifdef PPPOE_TERM_UNKNOWN_SESSIONS
00676   u8_t shost[ETHER_ADDR_LEN];
00677 #endif
00678 
00679 #ifdef PPPOE_TERM_UNKNOWN_SESSIONS
00680   MEMCPY(shost, ((struct eth_hdr *)pb->payload)->src.addr, sizeof(shost));
00681 #endif
00682   if (pbuf_header(pb, -(int)sizeof(struct eth_hdr)) != 0) {
00683     /* bail out */
00684     PPPDEBUG(LOG_ERR, ("pppoe_data_input: pbuf_header failed\n"));
00685     LINK_STATS_INC(link.lenerr);
00686     goto drop;
00687   } 
00688 
00689   pb = pppSingleBuf (pb);
00690 
00691   if (pb->len <= PPPOE_HEADERLEN) {
00692     printf("pppoe (data): dropping too short packet: %d bytes\n", pb->len);
00693     goto drop;
00694   }
00695 
00696   if (pb->len < sizeof(*ph)) {
00697     printf("pppoe_data_input: could not get PPPoE header\n");
00698     goto drop;
00699   }
00700   ph = (struct pppoehdr *)pb->payload;
00701 
00702   if (ph->vertype != PPPOE_VERTYPE) {
00703     printf("pppoe (data): unknown version/type packet: 0x%x\n", ph->vertype);
00704     goto drop;
00705   }
00706   if (ph->code != 0) {
00707     goto drop;
00708   }
00709 
00710   session = ntohs(ph->session);
00711   sc = pppoe_find_softc_by_session(session, netif);
00712   if (sc == NULL) {
00713 #ifdef PPPOE_TERM_UNKNOWN_SESSIONS
00714     printf("pppoe: input for unknown session 0x%x, sending PADT\n", session);
00715     pppoe_send_padt(netif, session, shost);
00716 #endif
00717     goto drop;
00718   }
00719 
00720   plen = ntohs(ph->plen);
00721 
00722   if (pbuf_header(pb, -(int)(PPPOE_HEADERLEN)) != 0) {
00723     /* bail out */
00724     PPPDEBUG(LOG_ERR, ("pppoe_data_input: pbuf_header PPPOE_HEADERLEN failed\n"));
00725     LINK_STATS_INC(link.lenerr);
00726     goto drop;
00727   } 
00728 
00729   PPPDEBUG(LOG_DEBUG, ("pppoe_data_input: %c%c%"U16_F": pkthdr.len=%d, pppoe.len=%d\n",
00730         sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num,
00731         pb->len, plen));
00732 
00733   if (pb->len < plen) {
00734     goto drop;
00735   }
00736 
00737   pppInProcOverEthernet(sc->sc_pd, pb);
00738 
00739   return;
00740 
00741 drop:
00742   pbuf_free(pb);
00743 }
00744 
00745 static err_t
00746 pppoe_output(struct pppoe_softc *sc, struct pbuf *pb)
00747 {
00748   struct eth_hdr *ethhdr;
00749   u16_t etype;
00750   err_t res;
00751 
00752   if (!sc->sc_ethif) {
00753     pbuf_free(pb);
00754     return ERR_IF;
00755   }
00756 
00757   ethhdr = (struct eth_hdr *)pb->payload;
00758   etype = sc->sc_state == PPPOE_STATE_SESSION ? ETHTYPE_PPPOE : ETHTYPE_PPPOEDISC;
00759   ethhdr->type = htons(etype);
00760   MEMCPY(ethhdr->dest.addr, sc->sc_dest.addr, sizeof(ethhdr->dest.addr));
00761   MEMCPY(ethhdr->src.addr, ((struct eth_addr *)sc->sc_ethif->hwaddr)->addr, sizeof(ethhdr->src.addr));
00762 
00763   PPPDEBUG(LOG_DEBUG, ("pppoe: %c%c%"U16_F" (%x) state=%d, session=0x%x output -> %02"X16_F":%02"X16_F":%02"X16_F":%02"X16_F":%02"X16_F":%02"X16_F", len=%d\n",
00764       sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num, etype,
00765       sc->sc_state, sc->sc_session,
00766       sc->sc_dest.addr[0], sc->sc_dest.addr[1], sc->sc_dest.addr[2], sc->sc_dest.addr[3], sc->sc_dest.addr[4], sc->sc_dest.addr[5],
00767       pb->tot_len));
00768 
00769   res = sc->sc_ethif->linkoutput(sc->sc_ethif, pb);
00770 
00771   pbuf_free(pb);
00772 
00773   return res;
00774 }
00775 
00776 static err_t
00777 pppoe_send_padi(struct pppoe_softc *sc)
00778 {
00779   struct pbuf *pb;
00780   u8_t *p;
00781   int len, l1 = 0, l2 = 0; /* XXX: gcc */
00782 
00783   if (sc->sc_state >PPPOE_STATE_PADI_SENT) {
00784     PPPDEBUG(LOG_ERR, ("ERROR: pppoe_send_padi in state %d", sc->sc_state));
00785   }
00786 
00787   /* calculate length of frame (excluding ethernet header + pppoe header) */
00788   len = 2 + 2 + 2 + 2 + sizeof sc;  /* service name tag is required, host unique is send too */
00789   if (sc->sc_service_name != NULL) {
00790     l1 = (int)strlen(sc->sc_service_name);
00791     len += l1;
00792   }
00793   if (sc->sc_concentrator_name != NULL) {
00794     l2 = (int)strlen(sc->sc_concentrator_name);
00795     len += 2 + 2 + l2;
00796   }
00797   LWIP_ASSERT("sizeof(struct eth_hdr) + PPPOE_HEADERLEN + len <= 0xffff",
00798     sizeof(struct eth_hdr) + PPPOE_HEADERLEN + len <= 0xffff);
00799 
00800   /* allocate a buffer */
00801   pb = pbuf_alloc(PBUF_LINK, (u16_t)(sizeof(struct eth_hdr) + PPPOE_HEADERLEN + len), PBUF_RAM);
00802   if (!pb) {
00803     return ERR_MEM;
00804   }
00805   LWIP_ASSERT("pb->tot_len == pb->len", pb->tot_len == pb->len);
00806 
00807   p = (u8_t*)pb->payload + sizeof (struct eth_hdr);
00808   /* fill in pkt */
00809   PPPOE_ADD_HEADER(p, PPPOE_CODE_PADI, 0, (u16_t)len);
00810   PPPOE_ADD_16(p, PPPOE_TAG_SNAME);
00811   if (sc->sc_service_name != NULL) {
00812     PPPOE_ADD_16(p, l1);
00813     MEMCPY(p, sc->sc_service_name, l1);
00814     p += l1;
00815   } else {
00816     PPPOE_ADD_16(p, 0);
00817   }
00818   if (sc->sc_concentrator_name != NULL) {
00819     PPPOE_ADD_16(p, PPPOE_TAG_ACNAME);
00820     PPPOE_ADD_16(p, l2);
00821     MEMCPY(p, sc->sc_concentrator_name, l2);
00822     p += l2;
00823   }
00824   PPPOE_ADD_16(p, PPPOE_TAG_HUNIQUE);
00825   PPPOE_ADD_16(p, sizeof(sc));
00826   MEMCPY(p, &sc, sizeof sc);
00827 
00828   /* send pkt */
00829   return pppoe_output(sc, pb);
00830 }
00831 
00832 static void
00833 pppoe_timeout(void *arg)
00834 {
00835   int retry_wait, err;
00836   struct pppoe_softc *sc = (struct pppoe_softc*)arg;
00837 
00838   PPPDEBUG(LOG_DEBUG, ("pppoe: %c%c%"U16_F": timeout\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num));
00839 
00840   switch (sc->sc_state) {
00841     case PPPOE_STATE_PADI_SENT:
00842       /*
00843        * We have two basic ways of retrying:
00844        *  - Quick retry mode: try a few times in short sequence
00845        *  - Slow retry mode: we already had a connection successfully
00846        *    established and will try infinitely (without user
00847        *    intervention)
00848        * We only enter slow retry mode if IFF_LINK1 (aka autodial)
00849        * is not set.
00850        */
00851 
00852       /* initialize for quick retry mode */
00853       retry_wait = PPPOE_DISC_TIMEOUT * (1 + sc->sc_padi_retried);
00854 
00855       sc->sc_padi_retried++;
00856       if (sc->sc_padi_retried >= PPPOE_DISC_MAXPADI) {
00857 #if 0
00858         if ((sc->sc_sppp.pp_if.if_flags & IFF_LINK1) == 0) {
00859           /* slow retry mode */
00860           retry_wait = PPPOE_SLOW_RETRY;
00861         } else
00862 #endif
00863         {
00864           pppoe_abort_connect(sc);
00865           return;
00866         }
00867       }
00868       if ((err = pppoe_send_padi(sc)) != 0) {
00869         sc->sc_padi_retried--;
00870         PPPDEBUG(LOG_DEBUG, ("pppoe: %c%c%"U16_F": failed to transmit PADI, error=%d\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num, err));
00871       }
00872       sys_timeout(retry_wait, pppoe_timeout, sc);
00873       break;
00874 
00875     case PPPOE_STATE_PADR_SENT:
00876       sc->sc_padr_retried++;
00877       if (sc->sc_padr_retried >= PPPOE_DISC_MAXPADR) {
00878         MEMCPY(&sc->sc_dest, ethbroadcast.addr, sizeof(sc->sc_dest));
00879         sc->sc_state = PPPOE_STATE_PADI_SENT;
00880         sc->sc_padr_retried = 0;
00881         if ((err = pppoe_send_padi(sc)) != 0) {
00882           PPPDEBUG(LOG_DEBUG, ("pppoe: %c%c%"U16_F": failed to send PADI, error=%d\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num, err));
00883         }
00884         sys_timeout(PPPOE_DISC_TIMEOUT * (1 + sc->sc_padi_retried), pppoe_timeout, sc);
00885         return;
00886       }
00887       if ((err = pppoe_send_padr(sc)) != 0) {
00888         sc->sc_padr_retried--;
00889         PPPDEBUG(LOG_DEBUG, ("pppoe: %c%c%"U16_F": failed to send PADR, error=%d\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num, err));
00890       }
00891       sys_timeout(PPPOE_DISC_TIMEOUT * (1 + sc->sc_padr_retried), pppoe_timeout, sc);
00892       break;
00893     case PPPOE_STATE_CLOSING:
00894       pppoe_do_disconnect(sc);
00895       break;
00896     default:
00897       return;  /* all done, work in peace */
00898   }
00899 }
00900 
00901 /* Start a connection (i.e. initiate discovery phase) */
00902 int
00903 pppoe_connect(struct pppoe_softc *sc)
00904 {
00905   int err;
00906 
00907   if (sc->sc_state != PPPOE_STATE_INITIAL) {
00908     return EBUSY;
00909   }
00910 
00911 #ifdef PPPOE_SERVER
00912   /* wait PADI if IFF_PASSIVE */
00913   if ((sc->sc_sppp.pp_if.if_flags & IFF_PASSIVE)) {
00914     return 0;
00915   }
00916 #endif
00917   /* save state, in case we fail to send PADI */
00918   sc->sc_state = PPPOE_STATE_PADI_SENT;
00919   sc->sc_padr_retried = 0;
00920   err = pppoe_send_padi(sc);
00921   PPPDEBUG(LOG_DEBUG, ("pppoe: %c%c%"U16_F": failed to send PADI, error=%d\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num, err));
00922   sys_timeout(PPPOE_DISC_TIMEOUT, pppoe_timeout, sc);
00923   return err;
00924 }
00925 
00926 /* disconnect */
00927 void
00928 pppoe_disconnect(struct pppoe_softc *sc)
00929 {
00930   if (sc->sc_state < PPPOE_STATE_SESSION) {
00931     return;
00932   }
00933   /*
00934    * Do not call pppoe_disconnect here, the upper layer state
00935    * machine gets confused by this. We must return from this
00936    * function and defer disconnecting to the timeout handler.
00937    */
00938   sc->sc_state = PPPOE_STATE_CLOSING;
00939   sys_timeout(20, pppoe_timeout, sc);
00940 }
00941 
00942 static int
00943 pppoe_do_disconnect(struct pppoe_softc *sc)
00944 {
00945   int err;
00946 
00947   if (sc->sc_state < PPPOE_STATE_SESSION) {
00948     err = EBUSY;
00949   } else {
00950     PPPDEBUG(LOG_DEBUG, ("pppoe: %c%c%"U16_F": disconnecting\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num));
00951     err = pppoe_send_padt(sc->sc_ethif, sc->sc_session, (const u8_t *)&sc->sc_dest);
00952   }
00953 
00954   /* cleanup softc */
00955   sc->sc_state = PPPOE_STATE_INITIAL;
00956   MEMCPY(&sc->sc_dest, ethbroadcast.addr, sizeof(sc->sc_dest));
00957   if (sc->sc_ac_cookie) {
00958     mem_free(sc->sc_ac_cookie);
00959     sc->sc_ac_cookie = NULL;
00960   }
00961   sc->sc_ac_cookie_len = 0;
00962 #ifdef PPPOE_SERVER
00963   if (sc->sc_hunique) {
00964     mem_free(sc->sc_hunique);
00965     sc->sc_hunique = NULL;
00966   }
00967   sc->sc_hunique_len = 0;
00968 #endif
00969   sc->sc_session = 0;
00970 
00971   sc->sc_linkStatusCB(sc->sc_pd, 0); /* notify upper layers */
00972 
00973   return err;
00974 }
00975 
00976 /* Connection attempt aborted */
00977 static void
00978 pppoe_abort_connect(struct pppoe_softc *sc)
00979 {
00980   printf("%c%c%"U16_F": could not establish connection\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num);
00981   sc->sc_state = PPPOE_STATE_CLOSING;
00982 
00983   sc->sc_linkStatusCB(sc->sc_pd, 0); /* notify upper layers */
00984 
00985   /* clear connection state */
00986   MEMCPY(&sc->sc_dest, ethbroadcast.addr, sizeof(sc->sc_dest));
00987   sc->sc_state = PPPOE_STATE_INITIAL;
00988 }
00989 
00990 /* Send a PADR packet */
00991 static err_t
00992 pppoe_send_padr(struct pppoe_softc *sc)
00993 {
00994   struct pbuf *pb;
00995   u8_t *p;
00996   size_t len, l1 = 0; /* XXX: gcc */
00997 
00998   if (sc->sc_state != PPPOE_STATE_PADR_SENT) {
00999     return ERR_CONN;
01000   }
01001 
01002   len = 2 + 2 + 2 + 2 + sizeof(sc);    /* service name, host unique */
01003   if (sc->sc_service_name != NULL) {    /* service name tag maybe empty */
01004     l1 = strlen(sc->sc_service_name);
01005     len += l1;
01006   }
01007   if (sc->sc_ac_cookie_len > 0) {
01008     len += 2 + 2 + sc->sc_ac_cookie_len;  /* AC cookie */
01009   }
01010   LWIP_ASSERT("sizeof(struct eth_hdr) + PPPOE_HEADERLEN + len <= 0xffff",
01011     sizeof(struct eth_hdr) + PPPOE_HEADERLEN + len <= 0xffff);
01012   pb = pbuf_alloc(PBUF_LINK, (u16_t)(sizeof(struct eth_hdr) + PPPOE_HEADERLEN + len), PBUF_RAM);
01013   if (!pb) {
01014     return ERR_MEM;
01015   }
01016   LWIP_ASSERT("pb->tot_len == pb->len", pb->tot_len == pb->len);
01017   p = (u8_t*)pb->payload + sizeof (struct eth_hdr);
01018   PPPOE_ADD_HEADER(p, PPPOE_CODE_PADR, 0, len);
01019   PPPOE_ADD_16(p, PPPOE_TAG_SNAME);
01020   if (sc->sc_service_name != NULL) {
01021     PPPOE_ADD_16(p, l1);
01022     MEMCPY(p, sc->sc_service_name, l1);
01023     p += l1;
01024   } else {
01025     PPPOE_ADD_16(p, 0);
01026   }
01027   if (sc->sc_ac_cookie_len > 0) {
01028     PPPOE_ADD_16(p, PPPOE_TAG_ACCOOKIE);
01029     PPPOE_ADD_16(p, sc->sc_ac_cookie_len);
01030     MEMCPY(p, sc->sc_ac_cookie, sc->sc_ac_cookie_len);
01031     p += sc->sc_ac_cookie_len;
01032   }
01033   PPPOE_ADD_16(p, PPPOE_TAG_HUNIQUE);
01034   PPPOE_ADD_16(p, sizeof(sc));
01035   MEMCPY(p, &sc, sizeof sc);
01036 
01037   return pppoe_output(sc, pb);
01038 }
01039 
01040 /* send a PADT packet */
01041 static err_t
01042 pppoe_send_padt(struct netif *outgoing_if, u_int session, const u8_t *dest)
01043 {
01044   struct pbuf *pb;
01045   struct eth_hdr *ethhdr;
01046   err_t res;
01047   u8_t *p;
01048 
01049   pb = pbuf_alloc(PBUF_LINK, sizeof(struct eth_hdr) + PPPOE_HEADERLEN, PBUF_RAM);
01050   if (!pb) {
01051     return ERR_MEM;
01052   }
01053   LWIP_ASSERT("pb->tot_len == pb->len", pb->tot_len == pb->len);
01054 
01055   ethhdr = (struct eth_hdr *)pb->payload;
01056   ethhdr->type = htons(ETHTYPE_PPPOEDISC);
01057   MEMCPY(ethhdr->dest.addr, dest, sizeof(ethhdr->dest.addr));
01058   MEMCPY(ethhdr->src.addr, ((struct eth_addr *)outgoing_if->hwaddr)->addr, sizeof(ethhdr->src.addr));
01059 
01060   p = (u8_t*)(ethhdr + 1);
01061   PPPOE_ADD_HEADER(p, PPPOE_CODE_PADT, session, 0);
01062 
01063   res = outgoing_if->linkoutput(outgoing_if, pb);
01064 
01065   pbuf_free(pb);
01066 
01067   return res;
01068 }
01069 
01070 #ifdef PPPOE_SERVER
01071 static err_t
01072 pppoe_send_pado(struct pppoe_softc *sc)
01073 {
01074   struct pbuf *pb;
01075   u8_t *p;
01076   size_t len;
01077 
01078   if (sc->sc_state != PPPOE_STATE_PADO_SENT) {
01079     return ERR_CONN;
01080   }
01081 
01082   /* calc length */
01083   len = 0;
01084   /* include ac_cookie */
01085   len += 2 + 2 + sizeof(sc);
01086   /* include hunique */
01087   len += 2 + 2 + sc->sc_hunique_len;
01088   pb = pbuf_alloc(PBUF_LINK, sizeof(struct eth_hdr) + PPPOE_HEADERLEN + len, PBUF_RAM);
01089   if (!pb) {
01090     return ERR_MEM;
01091   }
01092   LWIP_ASSERT("pb->tot_len == pb->len", pb->tot_len == pb->len);
01093   p = (u8_t*)pb->payload + sizeof (struct eth_hdr);
01094   PPPOE_ADD_HEADER(p, PPPOE_CODE_PADO, 0, len);
01095   PPPOE_ADD_16(p, PPPOE_TAG_ACCOOKIE);
01096   PPPOE_ADD_16(p, sizeof(sc));
01097   MEMCPY(p, &sc, sizeof(sc));
01098   p += sizeof(sc);
01099   PPPOE_ADD_16(p, PPPOE_TAG_HUNIQUE);
01100   PPPOE_ADD_16(p, sc->sc_hunique_len);
01101   MEMCPY(p, sc->sc_hunique, sc->sc_hunique_len);
01102   return pppoe_output(sc, pb);
01103 }
01104 
01105 static err_t
01106 pppoe_send_pads(struct pppoe_softc *sc)
01107 {
01108   struct pbuf *pb;
01109   u8_t *p;
01110   size_t len, l1 = 0;  /* XXX: gcc */
01111 
01112   if (sc->sc_state != PPPOE_STATE_PADO_SENT) {
01113     return ERR_CONN;
01114   }
01115 
01116   sc->sc_session = mono_time.tv_sec % 0xff + 1;
01117   /* calc length */
01118   len = 0;
01119   /* include hunique */
01120   len += 2 + 2 + 2 + 2 + sc->sc_hunique_len;  /* service name, host unique*/
01121   if (sc->sc_service_name != NULL) {    /* service name tag maybe empty */
01122     l1 = strlen(sc->sc_service_name);
01123     len += l1;
01124   }
01125   pb = pbuf_alloc(PBUF_LINK, sizeof(struct eth_hdr) + PPPOE_HEADERLEN + len, PBUF_RAM);
01126   if (!pb) {
01127     return ERR_MEM;
01128   }
01129   LWIP_ASSERT("pb->tot_len == pb->len", pb->tot_len == pb->len);
01130   p = (u8_t*)pb->payload + sizeof (struct eth_hdr);
01131   PPPOE_ADD_HEADER(p, PPPOE_CODE_PADS, sc->sc_session, len);
01132   PPPOE_ADD_16(p, PPPOE_TAG_SNAME);
01133   if (sc->sc_service_name != NULL) {
01134     PPPOE_ADD_16(p, l1);
01135     MEMCPY(p, sc->sc_service_name, l1);
01136     p += l1;
01137   } else {
01138     PPPOE_ADD_16(p, 0);
01139   }
01140   PPPOE_ADD_16(p, PPPOE_TAG_HUNIQUE);
01141   PPPOE_ADD_16(p, sc->sc_hunique_len);
01142   MEMCPY(p, sc->sc_hunique, sc->sc_hunique_len);
01143   return pppoe_output(sc, pb);
01144 }
01145 #endif
01146 
01147 err_t
01148 pppoe_xmit(struct pppoe_softc *sc, struct pbuf *pb)
01149 {
01150   u8_t *p;
01151   size_t len;
01152 
01153   /* are we ready to process data yet? */
01154   if (sc->sc_state < PPPOE_STATE_SESSION) {
01155     /*sppp_flush(&sc->sc_sppp.pp_if);*/
01156     pbuf_free(pb);
01157     return ERR_CONN;
01158   }
01159 
01160   len = pb->tot_len;
01161 
01162   /* make room for Ethernet header - should not fail */
01163   if (pbuf_header(pb, sizeof(struct eth_hdr) + PPPOE_HEADERLEN) != 0) {
01164     /* bail out */
01165     PPPDEBUG(LOG_ERR, ("pppoe: %c%c%"U16_F": pppoe_xmit: could not allocate room for header\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num));
01166     LINK_STATS_INC(link.lenerr);
01167     pbuf_free(pb);
01168     return ERR_BUF;
01169   } 
01170 
01171   p = (u8_t*)pb->payload + sizeof(struct eth_hdr);
01172   PPPOE_ADD_HEADER(p, 0, sc->sc_session, len);
01173 
01174   return pppoe_output(sc, pb);
01175 }
01176 
01177 #if 0 /*def PFIL_HOOKS*/
01178 static int
01179 pppoe_ifattach_hook(void *arg, struct pbuf **mp, struct netif *ifp, int dir)
01180 {
01181   struct pppoe_softc *sc;
01182   int s;
01183 
01184   if (mp != (struct pbuf **)PFIL_IFNET_DETACH) {
01185     return 0;
01186   }
01187 
01188   LIST_FOREACH(sc, &pppoe_softc_list, sc_list) {
01189     if (sc->sc_ethif != ifp) {
01190       continue;
01191     }
01192     if (sc->sc_sppp.pp_if.if_flags & IFF_UP) {
01193       sc->sc_sppp.pp_if.if_flags &= ~(IFF_UP|IFF_RUNNING);
01194       printf("%c%c%"U16_F": ethernet interface detached, going down\n",
01195           sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num);
01196     }
01197     sc->sc_ethif = NULL;
01198     pppoe_clear_softc(sc, "ethernet interface detached");
01199   }
01200 
01201   return 0;
01202 }
01203 #endif
01204 
01205 static void
01206 pppoe_clear_softc(struct pppoe_softc *sc, const char *message)
01207 {
01208   LWIP_UNUSED_ARG(message);
01209 
01210   /* stop timer */
01211   sys_untimeout(pppoe_timeout, sc);
01212   PPPDEBUG(LOG_DEBUG, ("pppoe: %c%c%"U16_F": session 0x%x terminated, %s\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num, sc->sc_session, message));
01213 
01214   /* fix our state */
01215   sc->sc_state = PPPOE_STATE_INITIAL;
01216 
01217   /* notify upper layers */
01218   sc->sc_linkStatusCB(sc->sc_pd, 0);
01219 
01220   /* clean up softc */
01221   MEMCPY(&sc->sc_dest, ethbroadcast.addr, sizeof(sc->sc_dest));
01222   if (sc->sc_ac_cookie) {
01223     mem_free(sc->sc_ac_cookie);
01224     sc->sc_ac_cookie = NULL;
01225   }
01226   sc->sc_ac_cookie_len = 0;
01227   sc->sc_session = 0;
01228 }
01229 
01230 #endif /* PPPOE_SUPPORT */
01231