ppp_oe.c

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 "netif/ppp_oe.h"
00076 
00077 #include "ppp.h"
00078 #include "pppdebug.h"
00079 
00080 #include "lwip/timers.h"
00081 #include "lwip/memp.h"
00082 
00083 #include <string.h>
00084 #include <stdio.h>
00085 
00086 
00087 /* Add a 16 bit unsigned value to a buffer pointed to by PTR */
00088 #define PPPOE_ADD_16(PTR, VAL) \
00089     *(PTR)++ = (u8_t)((VAL) / 256);    \
00090     *(PTR)++ = (u8_t)((VAL) % 256)
00091 
00092 /* Add a complete PPPoE header to the buffer pointed to by PTR */
00093 #define PPPOE_ADD_HEADER(PTR, CODE, SESS, LEN)  \
00094     *(PTR)++ = PPPOE_VERTYPE;  \
00095     *(PTR)++ = (CODE);         \
00096     PPPOE_ADD_16(PTR, SESS);   \
00097     PPPOE_ADD_16(PTR, LEN)
00098 
00099 #define PPPOE_DISC_TIMEOUT (5*1000)  /* base for quick timeout calculation */
00100 #define PPPOE_SLOW_RETRY   (60*1000) /* persistent retry interval */
00101 #define PPPOE_DISC_MAXPADI  4        /* retry PADI four times (quickly) */
00102 #define PPPOE_DISC_MAXPADR  2        /* retry PADR twice */
00103 
00104 #ifdef PPPOE_SERVER
00105 #error "PPPOE_SERVER is not yet supported under lwIP!"
00106 /* from if_spppsubr.c */
00107 #define IFF_PASSIVE IFF_LINK0 /* wait passively for connection */
00108 #endif
00109 
00110 #ifndef PPPOE_ERRORSTRING_LEN
00111 #define PPPOE_ERRORSTRING_LEN     64
00112 #endif
00113 static char pppoe_error_tmp[PPPOE_ERRORSTRING_LEN];
00114 
00115 
00116 /* input routines */
00117 static void pppoe_dispatch_disc_pkt(struct netif *, struct pbuf *);
00118 
00119 /* management routines */
00120 static int pppoe_do_disconnect(struct pppoe_softc *);
00121 static void pppoe_abort_connect(struct pppoe_softc *);
00122 static void pppoe_clear_softc(struct pppoe_softc *, const char *);
00123 
00124 /* internal timeout handling */
00125 static void pppoe_timeout(void *);
00126 
00127 /* sending actual protocol controll packets */
00128 static err_t pppoe_send_padi(struct pppoe_softc *);
00129 static err_t pppoe_send_padr(struct pppoe_softc *);
00130 #ifdef PPPOE_SERVER
00131 static err_t pppoe_send_pado(struct pppoe_softc *);
00132 static err_t pppoe_send_pads(struct pppoe_softc *);
00133 #endif
00134 static err_t pppoe_send_padt(struct netif *, u_int, const u8_t *);
00135 
00136 /* internal helper functions */
00137 static struct pppoe_softc * pppoe_find_softc_by_session(u_int, struct netif *);
00138 static struct pppoe_softc * pppoe_find_softc_by_hunique(u8_t *, size_t, struct netif *);
00139 
00140 /** linked list of created pppoe interfaces */
00141 static struct pppoe_softc *pppoe_softc_list;
00142 
00143 err_t
00144 pppoe_create(struct netif *ethif, int pd, void (*linkStatusCB)(int pd, int up), struct pppoe_softc **scptr)
00145 {
00146   struct pppoe_softc *sc;
00147 
00148   sc = (struct pppoe_softc *)memp_malloc(MEMP_PPPOE_IF);
00149   if (sc == NULL) {
00150     *scptr = NULL;
00151     return ERR_MEM;
00152   }
00153   memset(sc, 0, sizeof(struct pppoe_softc));
00154 
00155   /* changed to real address later */
00156   MEMCPY(&sc->sc_dest, ethbroadcast.addr, sizeof(sc->sc_dest));
00157 
00158   sc->sc_pd = pd;
00159   sc->sc_linkStatusCB = linkStatusCB;
00160   sc->sc_ethif = ethif;
00161 
00162   /* put the new interface at the head of the list */
00163   sc->next = pppoe_softc_list;
00164   pppoe_softc_list = sc;
00165 
00166   *scptr = sc;
00167 
00168   return ERR_OK;
00169 }
00170 
00171 err_t
00172 pppoe_destroy(struct netif *ifp)
00173 {
00174   struct pppoe_softc *sc, *prev = NULL;
00175 
00176   for (sc = pppoe_softc_list; sc != NULL; prev = sc, sc = sc->next) {
00177     if (sc->sc_ethif == ifp) {
00178       break;
00179     }
00180   }
00181 
00182   if(!(sc && (sc->sc_ethif == ifp))) {
00183     return ERR_IF;
00184   }
00185 
00186   sys_untimeout(pppoe_timeout, sc);
00187   if (prev == NULL) {
00188     /* remove sc from the head of the list */
00189     pppoe_softc_list = sc->next;
00190   } else {
00191     /* remove sc from the list */
00192     prev->next = sc->next;
00193   }
00194 
00195 #ifdef PPPOE_TODO
00196   if (sc->sc_concentrator_name) {
00197     mem_free(sc->sc_concentrator_name);
00198   }
00199   if (sc->sc_service_name) {
00200     mem_free(sc->sc_service_name);
00201   }
00202 #endif /* PPPOE_TODO */
00203   memp_free(MEMP_PPPOE_IF, sc);
00204 
00205   return ERR_OK;
00206 }
00207 
00208 /*
00209  * Find the interface handling the specified session.
00210  * Note: O(number of sessions open), this is a client-side only, mean
00211  * and lean implementation, so number of open sessions typically should
00212  * be 1.
00213  */
00214 static struct pppoe_softc *
00215 pppoe_find_softc_by_session(u_int session, struct netif *rcvif)
00216 {
00217   struct pppoe_softc *sc;
00218 
00219   if (session == 0) {
00220     return NULL;
00221   }
00222 
00223   for (sc = pppoe_softc_list; sc != NULL; sc = sc->next) {
00224     if (sc->sc_state == PPPOE_STATE_SESSION
00225         && sc->sc_session == session) {
00226       if (sc->sc_ethif == rcvif) {
00227         return sc;
00228       } else {
00229         return NULL;
00230       }
00231     }
00232   }
00233   return NULL;
00234 }
00235 
00236 /* Check host unique token passed and return appropriate softc pointer,
00237  * or NULL if token is bogus. */
00238 static struct pppoe_softc *
00239 pppoe_find_softc_by_hunique(u8_t *token, size_t len, struct netif *rcvif)
00240 {
00241   struct pppoe_softc *sc, *t;
00242 
00243   if (pppoe_softc_list == NULL) {
00244     return NULL;
00245   }
00246 
00247   if (len != sizeof sc) {
00248     return NULL;
00249   }
00250   MEMCPY(&t, token, len);
00251 
00252   for (sc = pppoe_softc_list; sc != NULL; sc = sc->next) {
00253     if (sc == t) {
00254       break;
00255     }
00256   }
00257 
00258   if (sc == NULL) {
00259     PPPDEBUG(LOG_DEBUG, ("pppoe: alien host unique tag, no session found\n"));
00260     return NULL;
00261   }
00262 
00263   /* should be safe to access *sc now */
00264   if (sc->sc_state < PPPOE_STATE_PADI_SENT || sc->sc_state >= PPPOE_STATE_SESSION) {
00265     printf("%c%c%"U16_F": host unique tag found, but it belongs to a connection in state %d\n",
00266       sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num, sc->sc_state);
00267     return NULL;
00268   }
00269   if (sc->sc_ethif != rcvif) {
00270     printf("%c%c%"U16_F": wrong interface, not accepting host unique\n",
00271       sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num);
00272     return NULL;
00273   }
00274   return sc;
00275 }
00276 
00277 static void
00278 pppoe_linkstatus_up(struct pppoe_softc *sc)
00279 {
00280   sc->sc_linkStatusCB(sc->sc_pd, 1);
00281 }
00282 
00283 /* analyze and handle a single received packet while not in session state */
00284 static void
00285 pppoe_dispatch_disc_pkt(struct netif *netif, struct pbuf *pb)
00286 {
00287   u16_t tag, len;
00288   u16_t session, plen;
00289   struct pppoe_softc *sc;
00290   const char *err_msg;
00291   char devname[6];
00292   u8_t *ac_cookie;
00293   u16_t ac_cookie_len;
00294 #ifdef PPPOE_SERVER
00295   u8_t *hunique;
00296   size_t hunique_len;
00297 #endif
00298   struct pppoehdr *ph;
00299   struct pppoetag pt;
00300   int off, err, errortag;
00301   struct eth_hdr *ethhdr;
00302 
00303   pb = pppSingleBuf(pb);
00304 
00305   strcpy(devname, "pppoe");  /* as long as we don't know which instance */
00306   err_msg = NULL;
00307   errortag = 0;
00308   if (pb->len < sizeof(*ethhdr)) {
00309     goto done;
00310   }
00311   ethhdr = (struct eth_hdr *)pb->payload;
00312   off = sizeof(*ethhdr);
00313 
00314   ac_cookie = NULL;
00315   ac_cookie_len = 0;
00316 #ifdef PPPOE_SERVER
00317   hunique = NULL;
00318   hunique_len = 0;
00319 #endif
00320   session = 0;
00321   if (pb->len - off < PPPOE_HEADERLEN) {
00322     printf("pppoe: packet too short: %d\n", pb->len);
00323     goto done;
00324   }
00325 
00326   ph = (struct pppoehdr *) (ethhdr + 1);
00327   if (ph->vertype != PPPOE_VERTYPE) {
00328     printf("pppoe: unknown version/type packet: 0x%x\n", ph->vertype);
00329     goto done;
00330   }
00331   session = ntohs(ph->session);
00332   plen = ntohs(ph->plen);
00333   off += sizeof(*ph);
00334 
00335   if (plen + off > pb->len) {
00336     printf("pppoe: packet content does not fit: data available = %d, packet size = %u\n",
00337         pb->len - off, plen);
00338     goto done;
00339   }
00340   if(pb->tot_len == pb->len) {
00341     pb->tot_len = pb->len = (u16_t)off + plen; /* ignore trailing garbage */
00342   }
00343   tag = 0;
00344   len = 0;
00345   sc = NULL;
00346   while (off + sizeof(pt) <= pb->len) {
00347     MEMCPY(&pt, (u8_t*)pb->payload + off, sizeof(pt));
00348     tag = ntohs(pt.tag);
00349     len = ntohs(pt.len);
00350     if (off + sizeof(pt) + len > pb->len) {
00351       printf("pppoe: tag 0x%x len 0x%x is too long\n", tag, len);
00352       goto done;
00353     }
00354     switch (tag) {
00355       case PPPOE_TAG_EOL:
00356         goto breakbreak;
00357       case PPPOE_TAG_SNAME:
00358         break;  /* ignored */
00359       case PPPOE_TAG_ACNAME:
00360         break;  /* ignored */
00361       case PPPOE_TAG_HUNIQUE:
00362         if (sc != NULL) {
00363           break;
00364         }
00365 #ifdef PPPOE_SERVER
00366         hunique = (u8_t*)pb->payload + off + sizeof(pt);
00367         hunique_len = len;
00368 #endif
00369         sc = pppoe_find_softc_by_hunique((u8_t*)pb->payload + off + sizeof(pt), len, netif);
00370         if (sc != NULL) {
00371           snprintf(devname, sizeof(devname), "%c%c%"U16_F, sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num);
00372         }
00373         break;
00374       case PPPOE_TAG_ACCOOKIE:
00375         if (ac_cookie == NULL) {
00376           ac_cookie = (u8_t*)pb->payload + off + sizeof(pt);
00377           ac_cookie_len = len;
00378         }
00379         break;
00380       case PPPOE_TAG_SNAME_ERR:
00381         err_msg = "SERVICE NAME ERROR";
00382         errortag = 1;
00383         break;
00384       case PPPOE_TAG_ACSYS_ERR:
00385         err_msg = "AC SYSTEM ERROR";
00386         errortag = 1;
00387         break;
00388       case PPPOE_TAG_GENERIC_ERR:
00389         err_msg = "GENERIC ERROR";
00390         errortag = 1;
00391         break;
00392     }
00393     if (err_msg) {
00394       if (errortag && len) {
00395         u16_t error_len = LWIP_MIN(len, sizeof(pppoe_error_tmp)-1);
00396         strncpy(pppoe_error_tmp, (char*)pb->payload + off + sizeof(pt), error_len);
00397         pppoe_error_tmp[error_len-1] = '\0';
00398         printf("%s: %s: %s\n", devname, err_msg, pppoe_error_tmp);
00399       } else {
00400         printf("%s: %s\n", devname, err_msg);
00401       }
00402       if (errortag) {
00403         goto done;
00404       }
00405     }
00406     off += sizeof(pt) + len;
00407   }
00408 
00409 breakbreak:;
00410   switch (ph->code) {
00411     case PPPOE_CODE_PADI:
00412 #ifdef PPPOE_SERVER
00413       /*
00414        * got service name, concentrator name, and/or host unique.
00415        * ignore if we have no interfaces with IFF_PASSIVE|IFF_UP.
00416        */
00417       if (LIST_EMPTY(&pppoe_softc_list)) {
00418         goto done;
00419       }
00420       LIST_FOREACH(sc, &pppoe_softc_list, sc_list) {
00421         if (!(sc->sc_sppp.pp_if.if_flags & IFF_UP)) {
00422           continue;
00423         }
00424         if (!(sc->sc_sppp.pp_if.if_flags & IFF_PASSIVE)) {
00425           continue;
00426         }
00427         if (sc->sc_state == PPPOE_STATE_INITIAL) {
00428           break;
00429         }
00430       }
00431       if (sc == NULL) {
00432         /* printf("pppoe: free passive interface is not found\n"); */
00433         goto done;
00434       }
00435       if (hunique) {
00436         if (sc->sc_hunique) {
00437           mem_free(sc->sc_hunique);
00438         }
00439         sc->sc_hunique = mem_malloc(hunique_len);
00440         if (sc->sc_hunique == NULL) {
00441           goto done;
00442         }
00443         sc->sc_hunique_len = hunique_len;
00444         MEMCPY(sc->sc_hunique, hunique, hunique_len);
00445       }
00446       MEMCPY(&sc->sc_dest, eh->ether_shost, sizeof sc->sc_dest);
00447       sc->sc_state = PPPOE_STATE_PADO_SENT;
00448       pppoe_send_pado(sc);
00449       break;
00450 #endif /* PPPOE_SERVER */
00451     case PPPOE_CODE_PADR:
00452 #ifdef PPPOE_SERVER
00453       /*
00454        * get sc from ac_cookie if IFF_PASSIVE
00455        */
00456       if (ac_cookie == NULL) {
00457         /* be quiet if there is not a single pppoe instance */
00458         printf("pppoe: received PADR but not includes ac_cookie\n");
00459         goto done;
00460       }
00461       sc = pppoe_find_softc_by_hunique(ac_cookie, ac_cookie_len, netif);
00462       if (sc == NULL) {
00463         /* be quiet if there is not a single pppoe instance */
00464         if (!LIST_EMPTY(&pppoe_softc_list)) {
00465           printf("pppoe: received PADR but could not find request for it\n");
00466         }
00467         goto done;
00468       }
00469       if (sc->sc_state != PPPOE_STATE_PADO_SENT) {
00470         printf("%c%c%"U16_F": received unexpected PADR\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num);
00471         goto done;
00472       }
00473       if (hunique) {
00474         if (sc->sc_hunique) {
00475           mem_free(sc->sc_hunique);
00476         }
00477         sc->sc_hunique = mem_malloc(hunique_len);
00478         if (sc->sc_hunique == NULL) {
00479           goto done;
00480         }
00481         sc->sc_hunique_len = hunique_len;
00482         MEMCPY(sc->sc_hunique, hunique, hunique_len);
00483       }
00484       pppoe_send_pads(sc);
00485       sc->sc_state = PPPOE_STATE_SESSION;
00486       pppoe_linkstatus_up(sc); /* notify upper layers */
00487       break;
00488 #else
00489       /* ignore, we are no access concentrator */
00490       goto done;
00491 #endif /* PPPOE_SERVER */
00492     case PPPOE_CODE_PADO:
00493       if (sc == NULL) {
00494         /* be quiet if there is not a single pppoe instance */
00495         if (pppoe_softc_list != NULL) {
00496           printf("pppoe: received PADO but could not find request for it\n");
00497         }
00498         goto done;
00499       }
00500       if (sc->sc_state != PPPOE_STATE_PADI_SENT) {
00501         printf("%c%c%"U16_F": received unexpected PADO\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num);
00502         goto done;
00503       }
00504       if (ac_cookie) {
00505         sc->sc_ac_cookie_len = ac_cookie_len;
00506         MEMCPY(sc->sc_ac_cookie, ac_cookie, ac_cookie_len);
00507       }
00508       MEMCPY(&sc->sc_dest, ethhdr->src.addr, sizeof(sc->sc_dest.addr));
00509       sys_untimeout(pppoe_timeout, sc);
00510       sc->sc_padr_retried = 0;
00511       sc->sc_state = PPPOE_STATE_PADR_SENT;
00512       if ((err = pppoe_send_padr(sc)) != 0) {
00513         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));
00514       }
00515       sys_timeout(PPPOE_DISC_TIMEOUT * (1 + sc->sc_padr_retried), pppoe_timeout, sc);
00516       break;
00517     case PPPOE_CODE_PADS:
00518       if (sc == NULL) {
00519         goto done;
00520       }
00521       sc->sc_session = session;
00522       sys_untimeout(pppoe_timeout, sc);
00523       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));
00524       sc->sc_state = PPPOE_STATE_SESSION;
00525       pppoe_linkstatus_up(sc); /* notify upper layers */
00526       break;
00527     case PPPOE_CODE_PADT:
00528       if (sc == NULL) {
00529         goto done;
00530       }
00531       pppoe_clear_softc(sc, "received PADT");
00532       break;
00533     default:
00534       if(sc) {
00535         printf("%c%c%"U16_F": unknown code (0x%"X16_F") session = 0x%"X16_F"\n",
00536             sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num,
00537             (u16_t)ph->code, session);
00538       } else {
00539         printf("pppoe: unknown code (0x%"X16_F") session = 0x%"X16_F"\n", (u16_t)ph->code, session);
00540       }
00541       break;
00542   }
00543 
00544 done:
00545   pbuf_free(pb);
00546   return;
00547 }
00548 
00549 void
00550 pppoe_disc_input(struct netif *netif, struct pbuf *p)
00551 {
00552   /* avoid error messages if there is not a single pppoe instance */
00553   if (pppoe_softc_list != NULL) {
00554     pppoe_dispatch_disc_pkt(netif, p);
00555   } else {
00556     pbuf_free(p);
00557   }
00558 }
00559 
00560 void
00561 pppoe_data_input(struct netif *netif, struct pbuf *pb)
00562 {
00563   u16_t session, plen;
00564   struct pppoe_softc *sc;
00565   struct pppoehdr *ph;
00566 #ifdef PPPOE_TERM_UNKNOWN_SESSIONS
00567   u8_t shost[ETHER_ADDR_LEN];
00568 #endif
00569 
00570 #ifdef PPPOE_TERM_UNKNOWN_SESSIONS
00571   MEMCPY(shost, ((struct eth_hdr *)pb->payload)->src.addr, sizeof(shost));
00572 #endif
00573   if (pbuf_header(pb, -(int)sizeof(struct eth_hdr)) != 0) {
00574     /* bail out */
00575     PPPDEBUG(LOG_ERR, ("pppoe_data_input: pbuf_header failed\n"));
00576     LINK_STATS_INC(link.lenerr);
00577     goto drop;
00578   } 
00579 
00580   pb = pppSingleBuf (pb);
00581 
00582   if (pb->len <= PPPOE_HEADERLEN) {
00583     printf("pppoe (data): dropping too short packet: %d bytes\n", pb->len);
00584     goto drop;
00585   }
00586 
00587   if (pb->len < sizeof(*ph)) {
00588     printf("pppoe_data_input: could not get PPPoE header\n");
00589     goto drop;
00590   }
00591   ph = (struct pppoehdr *)pb->payload;
00592 
00593   if (ph->vertype != PPPOE_VERTYPE) {
00594     printf("pppoe (data): unknown version/type packet: 0x%x\n", ph->vertype);
00595     goto drop;
00596   }
00597   if (ph->code != 0) {
00598     goto drop;
00599   }
00600 
00601   session = ntohs(ph->session);
00602   sc = pppoe_find_softc_by_session(session, netif);
00603   if (sc == NULL) {
00604 #ifdef PPPOE_TERM_UNKNOWN_SESSIONS
00605     printf("pppoe: input for unknown session 0x%x, sending PADT\n", session);
00606     pppoe_send_padt(netif, session, shost);
00607 #endif
00608     goto drop;
00609   }
00610 
00611   plen = ntohs(ph->plen);
00612 
00613   if (pbuf_header(pb, -(int)(PPPOE_HEADERLEN)) != 0) {
00614     /* bail out */
00615     PPPDEBUG(LOG_ERR, ("pppoe_data_input: pbuf_header PPPOE_HEADERLEN failed\n"));
00616     LINK_STATS_INC(link.lenerr);
00617     goto drop;
00618   } 
00619 
00620   PPPDEBUG(LOG_DEBUG, ("pppoe_data_input: %c%c%"U16_F": pkthdr.len=%d, pppoe.len=%d\n",
00621         sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num,
00622         pb->len, plen));
00623 
00624   if (pb->len < plen) {
00625     goto drop;
00626   }
00627 
00628   pppInProcOverEthernet(sc->sc_pd, pb);
00629 
00630   return;
00631 
00632 drop:
00633   pbuf_free(pb);
00634 }
00635 
00636 static err_t
00637 pppoe_output(struct pppoe_softc *sc, struct pbuf *pb)
00638 {
00639   struct eth_hdr *ethhdr;
00640   u16_t etype;
00641   err_t res;
00642 
00643   if (!sc->sc_ethif) {
00644     pbuf_free(pb);
00645     return ERR_IF;
00646   }
00647 
00648   ethhdr = (struct eth_hdr *)pb->payload;
00649   etype = sc->sc_state == PPPOE_STATE_SESSION ? ETHTYPE_PPPOE : ETHTYPE_PPPOEDISC;
00650   ethhdr->type = htons(etype);
00651   MEMCPY(ethhdr->dest.addr, sc->sc_dest.addr, sizeof(ethhdr->dest.addr));
00652   MEMCPY(ethhdr->src.addr, ((struct eth_addr *)sc->sc_ethif->hwaddr)->addr, sizeof(ethhdr->src.addr));
00653 
00654   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",
00655       sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num, etype,
00656       sc->sc_state, sc->sc_session,
00657       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],
00658       pb->tot_len));
00659 
00660   res = sc->sc_ethif->linkoutput(sc->sc_ethif, pb);
00661 
00662   pbuf_free(pb);
00663 
00664   return res;
00665 }
00666 
00667 static err_t
00668 pppoe_send_padi(struct pppoe_softc *sc)
00669 {
00670   struct pbuf *pb;
00671   u8_t *p;
00672   int len;
00673 #ifdef PPPOE_TODO
00674   int l1 = 0, l2 = 0; /* XXX: gcc */
00675 #endif /* PPPOE_TODO */
00676 
00677   if (sc->sc_state >PPPOE_STATE_PADI_SENT) {
00678     PPPDEBUG(LOG_ERR, ("ERROR: pppoe_send_padi in state %d", sc->sc_state));
00679   }
00680 
00681   /* calculate length of frame (excluding ethernet header + pppoe header) */
00682   len = 2 + 2 + 2 + 2 + sizeof sc;  /* service name tag is required, host unique is send too */
00683 #ifdef PPPOE_TODO
00684   if (sc->sc_service_name != NULL) {
00685     l1 = (int)strlen(sc->sc_service_name);
00686     len += l1;
00687   }
00688   if (sc->sc_concentrator_name != NULL) {
00689     l2 = (int)strlen(sc->sc_concentrator_name);
00690     len += 2 + 2 + l2;
00691   }
00692 #endif /* PPPOE_TODO */
00693   LWIP_ASSERT("sizeof(struct eth_hdr) + PPPOE_HEADERLEN + len <= 0xffff",
00694     sizeof(struct eth_hdr) + PPPOE_HEADERLEN + len <= 0xffff);
00695 
00696   /* allocate a buffer */
00697   pb = pbuf_alloc(PBUF_LINK, (u16_t)(sizeof(struct eth_hdr) + PPPOE_HEADERLEN + len), PBUF_RAM);
00698   if (!pb) {
00699     return ERR_MEM;
00700   }
00701   LWIP_ASSERT("pb->tot_len == pb->len", pb->tot_len == pb->len);
00702 
00703   p = (u8_t*)pb->payload + sizeof (struct eth_hdr);
00704   /* fill in pkt */
00705   PPPOE_ADD_HEADER(p, PPPOE_CODE_PADI, 0, (u16_t)len);
00706   PPPOE_ADD_16(p, PPPOE_TAG_SNAME);
00707 #ifdef PPPOE_TODO
00708   if (sc->sc_service_name != NULL) {
00709     PPPOE_ADD_16(p, l1);
00710     MEMCPY(p, sc->sc_service_name, l1);
00711     p += l1;
00712   } else
00713 #endif /* PPPOE_TODO */
00714   {
00715     PPPOE_ADD_16(p, 0);
00716   }
00717 #ifdef PPPOE_TODO
00718   if (sc->sc_concentrator_name != NULL) {
00719     PPPOE_ADD_16(p, PPPOE_TAG_ACNAME);
00720     PPPOE_ADD_16(p, l2);
00721     MEMCPY(p, sc->sc_concentrator_name, l2);
00722     p += l2;
00723   }
00724 #endif /* PPPOE_TODO */
00725   PPPOE_ADD_16(p, PPPOE_TAG_HUNIQUE);
00726   PPPOE_ADD_16(p, sizeof(sc));
00727   MEMCPY(p, &sc, sizeof sc);
00728 
00729   /* send pkt */
00730   return pppoe_output(sc, pb);
00731 }
00732 
00733 static void
00734 pppoe_timeout(void *arg)
00735 {
00736   int retry_wait, err;
00737   struct pppoe_softc *sc = (struct pppoe_softc*)arg;
00738 
00739   PPPDEBUG(LOG_DEBUG, ("pppoe: %c%c%"U16_F": timeout\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num));
00740 
00741   switch (sc->sc_state) {
00742     case PPPOE_STATE_PADI_SENT:
00743       /*
00744        * We have two basic ways of retrying:
00745        *  - Quick retry mode: try a few times in short sequence
00746        *  - Slow retry mode: we already had a connection successfully
00747        *    established and will try infinitely (without user
00748        *    intervention)
00749        * We only enter slow retry mode if IFF_LINK1 (aka autodial)
00750        * is not set.
00751        */
00752 
00753       /* initialize for quick retry mode */
00754       retry_wait = PPPOE_DISC_TIMEOUT * (1 + sc->sc_padi_retried);
00755 
00756       sc->sc_padi_retried++;
00757       if (sc->sc_padi_retried >= PPPOE_DISC_MAXPADI) {
00758 #if 0
00759         if ((sc->sc_sppp.pp_if.if_flags & IFF_LINK1) == 0) {
00760           /* slow retry mode */
00761           retry_wait = PPPOE_SLOW_RETRY;
00762         } else
00763 #endif
00764         {
00765           pppoe_abort_connect(sc);
00766           return;
00767         }
00768       }
00769       if ((err = pppoe_send_padi(sc)) != 0) {
00770         sc->sc_padi_retried--;
00771         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));
00772       }
00773       sys_timeout(retry_wait, pppoe_timeout, sc);
00774       break;
00775 
00776     case PPPOE_STATE_PADR_SENT:
00777       sc->sc_padr_retried++;
00778       if (sc->sc_padr_retried >= PPPOE_DISC_MAXPADR) {
00779         MEMCPY(&sc->sc_dest, ethbroadcast.addr, sizeof(sc->sc_dest));
00780         sc->sc_state = PPPOE_STATE_PADI_SENT;
00781         sc->sc_padr_retried = 0;
00782         if ((err = pppoe_send_padi(sc)) != 0) {
00783           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));
00784         }
00785         sys_timeout(PPPOE_DISC_TIMEOUT * (1 + sc->sc_padi_retried), pppoe_timeout, sc);
00786         return;
00787       }
00788       if ((err = pppoe_send_padr(sc)) != 0) {
00789         sc->sc_padr_retried--;
00790         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));
00791       }
00792       sys_timeout(PPPOE_DISC_TIMEOUT * (1 + sc->sc_padr_retried), pppoe_timeout, sc);
00793       break;
00794     case PPPOE_STATE_CLOSING:
00795       pppoe_do_disconnect(sc);
00796       break;
00797     default:
00798       return;  /* all done, work in peace */
00799   }
00800 }
00801 
00802 /* Start a connection (i.e. initiate discovery phase) */
00803 int
00804 pppoe_connect(struct pppoe_softc *sc)
00805 {
00806   int err;
00807 
00808   if (sc->sc_state != PPPOE_STATE_INITIAL) {
00809     return EBUSY;
00810   }
00811 
00812 #ifdef PPPOE_SERVER
00813   /* wait PADI if IFF_PASSIVE */
00814   if ((sc->sc_sppp.pp_if.if_flags & IFF_PASSIVE)) {
00815     return 0;
00816   }
00817 #endif
00818   /* save state, in case we fail to send PADI */
00819   sc->sc_state = PPPOE_STATE_PADI_SENT;
00820   sc->sc_padr_retried = 0;
00821   err = pppoe_send_padi(sc);
00822   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));
00823   sys_timeout(PPPOE_DISC_TIMEOUT, pppoe_timeout, sc);
00824   return err;
00825 }
00826 
00827 /* disconnect */
00828 void
00829 pppoe_disconnect(struct pppoe_softc *sc)
00830 {
00831   if (sc->sc_state < PPPOE_STATE_SESSION) {
00832     return;
00833   }
00834   /*
00835    * Do not call pppoe_disconnect here, the upper layer state
00836    * machine gets confused by this. We must return from this
00837    * function and defer disconnecting to the timeout handler.
00838    */
00839   sc->sc_state = PPPOE_STATE_CLOSING;
00840   sys_timeout(20, pppoe_timeout, sc);
00841 }
00842 
00843 static int
00844 pppoe_do_disconnect(struct pppoe_softc *sc)
00845 {
00846   int err;
00847 
00848   if (sc->sc_state < PPPOE_STATE_SESSION) {
00849     err = EBUSY;
00850   } else {
00851     PPPDEBUG(LOG_DEBUG, ("pppoe: %c%c%"U16_F": disconnecting\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num));
00852     err = pppoe_send_padt(sc->sc_ethif, sc->sc_session, (const u8_t *)&sc->sc_dest);
00853   }
00854 
00855   /* cleanup softc */
00856   sc->sc_state = PPPOE_STATE_INITIAL;
00857   MEMCPY(&sc->sc_dest, ethbroadcast.addr, sizeof(sc->sc_dest));
00858   sc->sc_ac_cookie_len = 0;
00859 #ifdef PPPOE_SERVER
00860   if (sc->sc_hunique) {
00861     mem_free(sc->sc_hunique);
00862     sc->sc_hunique = NULL;
00863   }
00864   sc->sc_hunique_len = 0;
00865 #endif
00866   sc->sc_session = 0;
00867 
00868   sc->sc_linkStatusCB(sc->sc_pd, 0); /* notify upper layers */
00869 
00870   return err;
00871 }
00872 
00873 /* Connection attempt aborted */
00874 static void
00875 pppoe_abort_connect(struct pppoe_softc *sc)
00876 {
00877   printf("%c%c%"U16_F": could not establish connection\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num);
00878   sc->sc_state = PPPOE_STATE_CLOSING;
00879 
00880   sc->sc_linkStatusCB(sc->sc_pd, 0); /* notify upper layers */
00881 
00882   /* clear connection state */
00883   MEMCPY(&sc->sc_dest, ethbroadcast.addr, sizeof(sc->sc_dest));
00884   sc->sc_state = PPPOE_STATE_INITIAL;
00885 }
00886 
00887 /* Send a PADR packet */
00888 static err_t
00889 pppoe_send_padr(struct pppoe_softc *sc)
00890 {
00891   struct pbuf *pb;
00892   u8_t *p;
00893   size_t len;
00894 #ifdef PPPOE_TODO
00895   size_t l1 = 0; /* XXX: gcc */
00896 #endif /* PPPOE_TODO */
00897 
00898   if (sc->sc_state != PPPOE_STATE_PADR_SENT) {
00899     return ERR_CONN;
00900   }
00901 
00902   len = 2 + 2 + 2 + 2 + sizeof(sc);    /* service name, host unique */
00903 #ifdef PPPOE_TODO
00904   if (sc->sc_service_name != NULL) {    /* service name tag maybe empty */
00905     l1 = strlen(sc->sc_service_name);
00906     len += l1;
00907   }
00908 #endif /* PPPOE_TODO */
00909   if (sc->sc_ac_cookie_len > 0) {
00910     len += 2 + 2 + sc->sc_ac_cookie_len;  /* AC cookie */
00911   }
00912   LWIP_ASSERT("sizeof(struct eth_hdr) + PPPOE_HEADERLEN + len <= 0xffff",
00913     sizeof(struct eth_hdr) + PPPOE_HEADERLEN + len <= 0xffff);
00914   pb = pbuf_alloc(PBUF_LINK, (u16_t)(sizeof(struct eth_hdr) + PPPOE_HEADERLEN + len), PBUF_RAM);
00915   if (!pb) {
00916     return ERR_MEM;
00917   }
00918   LWIP_ASSERT("pb->tot_len == pb->len", pb->tot_len == pb->len);
00919   p = (u8_t*)pb->payload + sizeof (struct eth_hdr);
00920   PPPOE_ADD_HEADER(p, PPPOE_CODE_PADR, 0, len);
00921   PPPOE_ADD_16(p, PPPOE_TAG_SNAME);
00922 #ifdef PPPOE_TODO
00923   if (sc->sc_service_name != NULL) {
00924     PPPOE_ADD_16(p, l1);
00925     MEMCPY(p, sc->sc_service_name, l1);
00926     p += l1;
00927   } else
00928 #endif /* PPPOE_TODO */
00929   {
00930     PPPOE_ADD_16(p, 0);
00931   }
00932   if (sc->sc_ac_cookie_len > 0) {
00933     PPPOE_ADD_16(p, PPPOE_TAG_ACCOOKIE);
00934     PPPOE_ADD_16(p, sc->sc_ac_cookie_len);
00935     MEMCPY(p, sc->sc_ac_cookie, sc->sc_ac_cookie_len);
00936     p += sc->sc_ac_cookie_len;
00937   }
00938   PPPOE_ADD_16(p, PPPOE_TAG_HUNIQUE);
00939   PPPOE_ADD_16(p, sizeof(sc));
00940   MEMCPY(p, &sc, sizeof sc);
00941 
00942   return pppoe_output(sc, pb);
00943 }
00944 
00945 /* send a PADT packet */
00946 static err_t
00947 pppoe_send_padt(struct netif *outgoing_if, u_int session, const u8_t *dest)
00948 {
00949   struct pbuf *pb;
00950   struct eth_hdr *ethhdr;
00951   err_t res;
00952   u8_t *p;
00953 
00954   pb = pbuf_alloc(PBUF_LINK, sizeof(struct eth_hdr) + PPPOE_HEADERLEN, PBUF_RAM);
00955   if (!pb) {
00956     return ERR_MEM;
00957   }
00958   LWIP_ASSERT("pb->tot_len == pb->len", pb->tot_len == pb->len);
00959 
00960   ethhdr = (struct eth_hdr *)pb->payload;
00961   ethhdr->type = PP_HTONS(ETHTYPE_PPPOEDISC);
00962   MEMCPY(ethhdr->dest.addr, dest, sizeof(ethhdr->dest.addr));
00963   MEMCPY(ethhdr->src.addr, ((struct eth_addr *)outgoing_if->hwaddr)->addr, sizeof(ethhdr->src.addr));
00964 
00965   p = (u8_t*)(ethhdr + 1);
00966   PPPOE_ADD_HEADER(p, PPPOE_CODE_PADT, session, 0);
00967 
00968   res = outgoing_if->linkoutput(outgoing_if, pb);
00969 
00970   pbuf_free(pb);
00971 
00972   return res;
00973 }
00974 
00975 #ifdef PPPOE_SERVER
00976 static err_t
00977 pppoe_send_pado(struct pppoe_softc *sc)
00978 {
00979   struct pbuf *pb;
00980   u8_t *p;
00981   size_t len;
00982 
00983   if (sc->sc_state != PPPOE_STATE_PADO_SENT) {
00984     return ERR_CONN;
00985   }
00986 
00987   /* calc length */
00988   len = 0;
00989   /* include ac_cookie */
00990   len += 2 + 2 + sizeof(sc);
00991   /* include hunique */
00992   len += 2 + 2 + sc->sc_hunique_len;
00993   pb = pbuf_alloc(PBUF_LINK, sizeof(struct eth_hdr) + PPPOE_HEADERLEN + len, PBUF_RAM);
00994   if (!pb) {
00995     return ERR_MEM;
00996   }
00997   LWIP_ASSERT("pb->tot_len == pb->len", pb->tot_len == pb->len);
00998   p = (u8_t*)pb->payload + sizeof (struct eth_hdr);
00999   PPPOE_ADD_HEADER(p, PPPOE_CODE_PADO, 0, len);
01000   PPPOE_ADD_16(p, PPPOE_TAG_ACCOOKIE);
01001   PPPOE_ADD_16(p, sizeof(sc));
01002   MEMCPY(p, &sc, sizeof(sc));
01003   p += sizeof(sc);
01004   PPPOE_ADD_16(p, PPPOE_TAG_HUNIQUE);
01005   PPPOE_ADD_16(p, sc->sc_hunique_len);
01006   MEMCPY(p, sc->sc_hunique, sc->sc_hunique_len);
01007   return pppoe_output(sc, pb);
01008 }
01009 
01010 static err_t
01011 pppoe_send_pads(struct pppoe_softc *sc)
01012 {
01013   struct pbuf *pb;
01014   u8_t *p;
01015   size_t len, l1 = 0;  /* XXX: gcc */
01016 
01017   if (sc->sc_state != PPPOE_STATE_PADO_SENT) {
01018     return ERR_CONN;
01019   }
01020 
01021   sc->sc_session = mono_time.tv_sec % 0xff + 1;
01022   /* calc length */
01023   len = 0;
01024   /* include hunique */
01025   len += 2 + 2 + 2 + 2 + sc->sc_hunique_len;  /* service name, host unique*/
01026   if (sc->sc_service_name != NULL) {    /* service name tag maybe empty */
01027     l1 = strlen(sc->sc_service_name);
01028     len += l1;
01029   }
01030   pb = pbuf_alloc(PBUF_LINK, sizeof(struct eth_hdr) + PPPOE_HEADERLEN + len, PBUF_RAM);
01031   if (!pb) {
01032     return ERR_MEM;
01033   }
01034   LWIP_ASSERT("pb->tot_len == pb->len", pb->tot_len == pb->len);
01035   p = (u8_t*)pb->payload + sizeof (struct eth_hdr);
01036   PPPOE_ADD_HEADER(p, PPPOE_CODE_PADS, sc->sc_session, len);
01037   PPPOE_ADD_16(p, PPPOE_TAG_SNAME);
01038   if (sc->sc_service_name != NULL) {
01039     PPPOE_ADD_16(p, l1);
01040     MEMCPY(p, sc->sc_service_name, l1);
01041     p += l1;
01042   } else {
01043     PPPOE_ADD_16(p, 0);
01044   }
01045   PPPOE_ADD_16(p, PPPOE_TAG_HUNIQUE);
01046   PPPOE_ADD_16(p, sc->sc_hunique_len);
01047   MEMCPY(p, sc->sc_hunique, sc->sc_hunique_len);
01048   return pppoe_output(sc, pb);
01049 }
01050 #endif
01051 
01052 err_t
01053 pppoe_xmit(struct pppoe_softc *sc, struct pbuf *pb)
01054 {
01055   u8_t *p;
01056   size_t len;
01057 
01058   /* are we ready to process data yet? */
01059   if (sc->sc_state < PPPOE_STATE_SESSION) {
01060     /*sppp_flush(&sc->sc_sppp.pp_if);*/
01061     pbuf_free(pb);
01062     return ERR_CONN;
01063   }
01064 
01065   len = pb->tot_len;
01066 
01067   /* make room for Ethernet header - should not fail */
01068   if (pbuf_header(pb, sizeof(struct eth_hdr) + PPPOE_HEADERLEN) != 0) {
01069     /* bail out */
01070     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));
01071     LINK_STATS_INC(link.lenerr);
01072     pbuf_free(pb);
01073     return ERR_BUF;
01074   } 
01075 
01076   p = (u8_t*)pb->payload + sizeof(struct eth_hdr);
01077   PPPOE_ADD_HEADER(p, 0, sc->sc_session, len);
01078 
01079   return pppoe_output(sc, pb);
01080 }
01081 
01082 #if 0 /*def PFIL_HOOKS*/
01083 static int
01084 pppoe_ifattach_hook(void *arg, struct pbuf **mp, struct netif *ifp, int dir)
01085 {
01086   struct pppoe_softc *sc;
01087   int s;
01088 
01089   if (mp != (struct pbuf **)PFIL_IFNET_DETACH) {
01090     return 0;
01091   }
01092 
01093   LIST_FOREACH(sc, &pppoe_softc_list, sc_list) {
01094     if (sc->sc_ethif != ifp) {
01095       continue;
01096     }
01097     if (sc->sc_sppp.pp_if.if_flags & IFF_UP) {
01098       sc->sc_sppp.pp_if.if_flags &= ~(IFF_UP|IFF_RUNNING);
01099       printf("%c%c%"U16_F": ethernet interface detached, going down\n",
01100           sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num);
01101     }
01102     sc->sc_ethif = NULL;
01103     pppoe_clear_softc(sc, "ethernet interface detached");
01104   }
01105 
01106   return 0;
01107 }
01108 #endif
01109 
01110 static void
01111 pppoe_clear_softc(struct pppoe_softc *sc, const char *message)
01112 {
01113   LWIP_UNUSED_ARG(message);
01114 
01115   /* stop timer */
01116   sys_untimeout(pppoe_timeout, sc);
01117   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));
01118 
01119   /* fix our state */
01120   sc->sc_state = PPPOE_STATE_INITIAL;
01121 
01122   /* notify upper layers */
01123   sc->sc_linkStatusCB(sc->sc_pd, 0);
01124 
01125   /* clean up softc */
01126   MEMCPY(&sc->sc_dest, ethbroadcast.addr, sizeof(sc->sc_dest));
01127   sc->sc_ac_cookie_len = 0;
01128   sc->sc_session = 0;
01129 }
01130 
01131 #endif /* PPPOE_SUPPORT */
01132