lwip_pppoe.c

00001 /*****************************************************************************
00002 * pppoe.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 "netif/ppp/ppp_opts.h"
00072 #if PPP_SUPPORT && PPPOE_SUPPORT /* don't build if not configured for use in lwipopts.h */
00073 
00074 #if 0 /* UNUSED */
00075 #include <string.h>
00076 #include <stdio.h>
00077 #endif /* UNUSED */
00078 
00079 #include "lwip/timeouts.h"
00080 #include "lwip/memp.h"
00081 #include "lwip/stats.h"
00082 #include "lwip/snmp.h"
00083 
00084 #include "netif/lwip_ethernet.h"
00085 #include "netif/ppp/ppp_impl.h"
00086 #include "netif/ppp/lcp.h"
00087 #include "netif/ppp/ipcp.h"
00088 #include "netif/ppp/pppoe.h"
00089 
00090 /* Memory pool */
00091 LWIP_MEMPOOL_DECLARE(PPPOE_IF, MEMP_NUM_PPPOE_INTERFACES, sizeof(struct pppoe_softc), "PPPOE_IF")
00092 
00093 /* Add a 16 bit unsigned value to a buffer pointed to by PTR */
00094 #define PPPOE_ADD_16(PTR, VAL) \
00095     *(PTR)++ = (u8_t)((VAL) / 256);    \
00096     *(PTR)++ = (u8_t)((VAL) % 256)
00097 
00098 /* Add a complete PPPoE header to the buffer pointed to by PTR */
00099 #define PPPOE_ADD_HEADER(PTR, CODE, SESS, LEN)  \
00100     *(PTR)++ = PPPOE_VERTYPE;  \
00101     *(PTR)++ = (CODE);         \
00102     PPPOE_ADD_16(PTR, SESS);   \
00103     PPPOE_ADD_16(PTR, LEN)
00104 
00105 #define PPPOE_DISC_TIMEOUT (5*1000)  /* base for quick timeout calculation */
00106 #define PPPOE_SLOW_RETRY   (60*1000) /* persistent retry interval */
00107 #define PPPOE_DISC_MAXPADI  4        /* retry PADI four times (quickly) */
00108 #define PPPOE_DISC_MAXPADR  2        /* retry PADR twice */
00109 
00110 #ifdef PPPOE_SERVER
00111 #error "PPPOE_SERVER is not yet supported under lwIP!"
00112 /* from if_spppsubr.c */
00113 #define IFF_PASSIVE IFF_LINK0 /* wait passively for connection */
00114 #endif
00115 
00116 #define PPPOE_ERRORSTRING_LEN     64
00117 
00118 
00119 /* callbacks called from PPP core */
00120 static err_t pppoe_write(ppp_pcb *ppp, void *ctx, struct pbuf *p);
00121 static err_t pppoe_netif_output(ppp_pcb *ppp, void *ctx, struct pbuf *p, u_short protocol);
00122 static void pppoe_connect(ppp_pcb *ppp, void *ctx);
00123 static void pppoe_disconnect(ppp_pcb *ppp, void *ctx);
00124 static err_t pppoe_destroy(ppp_pcb *ppp, void *ctx);
00125 
00126 /* management routines */
00127 static void pppoe_abort_connect(struct pppoe_softc *);
00128 #if 0 /* UNUSED */
00129 static void pppoe_clear_softc(struct pppoe_softc *, const char *);
00130 #endif /* UNUSED */
00131 
00132 /* internal timeout handling */
00133 static void pppoe_timeout(void *);
00134 
00135 /* sending actual protocol controll packets */
00136 static err_t pppoe_send_padi(struct pppoe_softc *);
00137 static err_t pppoe_send_padr(struct pppoe_softc *);
00138 #ifdef PPPOE_SERVER
00139 static err_t pppoe_send_pado(struct pppoe_softc *);
00140 static err_t pppoe_send_pads(struct pppoe_softc *);
00141 #endif
00142 static err_t pppoe_send_padt(struct netif *, u_int, const u8_t *);
00143 
00144 /* internal helper functions */
00145 static err_t pppoe_xmit(struct pppoe_softc *sc, struct pbuf *pb);
00146 static struct pppoe_softc* pppoe_find_softc_by_session(u_int session, struct netif *rcvif);
00147 static struct pppoe_softc* pppoe_find_softc_by_hunique(u8_t *token, size_t len, struct netif *rcvif);
00148 
00149 /** linked list of created pppoe interfaces */
00150 static struct pppoe_softc *pppoe_softc_list;
00151 
00152 /* Callbacks structure for PPP core */
00153 static const struct link_callbacks pppoe_callbacks = {
00154   pppoe_connect,
00155 #if PPP_SERVER
00156   NULL,
00157 #endif /* PPP_SERVER */
00158   pppoe_disconnect,
00159   pppoe_destroy,
00160   pppoe_write,
00161   pppoe_netif_output,
00162   NULL,
00163   NULL
00164 };
00165 
00166 /*
00167  * Create a new PPP Over Ethernet (PPPoE) connection.
00168  *
00169  * Return 0 on success, an error code on failure.
00170  */
00171 ppp_pcb *pppoe_create(struct netif *pppif,
00172        struct netif *ethif,
00173        const char *service_name, const char *concentrator_name,
00174        ppp_link_status_cb_fn link_status_cb, void *ctx_cb)
00175 {
00176   ppp_pcb *ppp;
00177   struct pppoe_softc *sc;
00178   LWIP_UNUSED_ARG(service_name);
00179   LWIP_UNUSED_ARG(concentrator_name);
00180 
00181   sc = (struct pppoe_softc *)LWIP_MEMPOOL_ALLOC(PPPOE_IF);
00182   if (sc == NULL) {
00183     return NULL;
00184   }
00185 
00186   ppp = ppp_new(pppif, &pppoe_callbacks, sc, link_status_cb, ctx_cb);
00187   if (ppp == NULL) {
00188     LWIP_MEMPOOL_FREE(PPPOE_IF, sc);
00189     return NULL;
00190   }
00191 
00192   memset(sc, 0, sizeof(struct pppoe_softc));
00193   sc->pcb = ppp;
00194   sc->sc_ethif = ethif;
00195   /* put the new interface at the head of the list */
00196   sc->next = pppoe_softc_list;
00197   pppoe_softc_list = sc;
00198   return ppp;
00199 }
00200 
00201 /* Called by PPP core */
00202 static err_t pppoe_write(ppp_pcb *ppp, void *ctx, struct pbuf *p) {
00203   struct pppoe_softc *sc = (struct pppoe_softc *)ctx;
00204   struct pbuf *ph; /* Ethernet + PPPoE header */
00205   err_t ret;
00206 #if MIB2_STATS
00207   u16_t tot_len;
00208 #else /* MIB2_STATS */
00209   LWIP_UNUSED_ARG(ppp);
00210 #endif /* MIB2_STATS */
00211 
00212   /* skip address & flags */
00213   pbuf_header(p, -(s16_t)2);
00214 
00215   ph = pbuf_alloc(PBUF_LINK, (u16_t)(PPPOE_HEADERLEN), PBUF_RAM);
00216   if(!ph) {
00217     LINK_STATS_INC(link.memerr);
00218     LINK_STATS_INC(link.proterr);
00219     MIB2_STATS_NETIF_INC(ppp->netif, ifoutdiscards);
00220     pbuf_free(p);
00221     return ERR_MEM;
00222   }
00223 
00224   pbuf_header(ph, -(s16_t)PPPOE_HEADERLEN); /* hide PPPoE header */
00225   pbuf_cat(ph, p);
00226 #if MIB2_STATS
00227   tot_len = ph->tot_len;
00228 #endif /* MIB2_STATS */
00229 
00230   ret = pppoe_xmit(sc, ph);
00231   if (ret != ERR_OK) {
00232     LINK_STATS_INC(link.err);
00233     MIB2_STATS_NETIF_INC(ppp->netif, ifoutdiscards);
00234     return ret;
00235   }
00236 
00237   MIB2_STATS_NETIF_ADD(ppp->netif, ifoutoctets, (u16_t)tot_len);
00238   MIB2_STATS_NETIF_INC(ppp->netif, ifoutucastpkts);
00239   LINK_STATS_INC(link.xmit);
00240   return ERR_OK;
00241 }
00242 
00243 /* Called by PPP core */
00244 static err_t pppoe_netif_output(ppp_pcb *ppp, void *ctx, struct pbuf *p, u_short protocol) {
00245   struct pppoe_softc *sc = (struct pppoe_softc *)ctx;
00246   struct pbuf *pb;
00247   u8_t *pl;
00248   err_t err;
00249 #if MIB2_STATS
00250   u16_t tot_len;
00251 #else /* MIB2_STATS */
00252   LWIP_UNUSED_ARG(ppp);
00253 #endif /* MIB2_STATS */
00254 
00255   /* @todo: try to use pbuf_header() here! */
00256   pb = pbuf_alloc(PBUF_LINK, PPPOE_HEADERLEN + sizeof(protocol), PBUF_RAM);
00257   if(!pb) {
00258     LINK_STATS_INC(link.memerr);
00259     LINK_STATS_INC(link.proterr);
00260     MIB2_STATS_NETIF_INC(ppp->netif, ifoutdiscards);
00261     return ERR_MEM;
00262   }
00263 
00264   pbuf_header(pb, -(s16_t)PPPOE_HEADERLEN);
00265 
00266   pl = (u8_t*)pb->payload;
00267   PUTSHORT(protocol, pl);
00268 
00269   pbuf_chain(pb, p);
00270 #if MIB2_STATS
00271   tot_len = pb->tot_len;
00272 #endif /* MIB2_STATS */
00273 
00274   if( (err = pppoe_xmit(sc, pb)) != ERR_OK) {
00275     LINK_STATS_INC(link.err);
00276     MIB2_STATS_NETIF_INC(ppp->netif, ifoutdiscards);
00277     return err;
00278   }
00279 
00280   MIB2_STATS_NETIF_ADD(ppp->netif, ifoutoctets, tot_len);
00281   MIB2_STATS_NETIF_INC(ppp->netif, ifoutucastpkts);
00282   LINK_STATS_INC(link.xmit);
00283   return ERR_OK;
00284 }
00285 
00286 static err_t
00287 pppoe_destroy(ppp_pcb *ppp, void *ctx)
00288 {
00289   struct pppoe_softc *sc = (struct pppoe_softc *)ctx;
00290   struct pppoe_softc **copp, *freep;
00291   LWIP_UNUSED_ARG(ppp);
00292 
00293   sys_untimeout(pppoe_timeout, sc);
00294 
00295   /* remove interface from list */
00296   for (copp = &pppoe_softc_list; (freep = *copp); copp = &freep->next) {
00297     if (freep == sc) {
00298        *copp = freep->next;
00299        break;
00300     }
00301   }
00302 
00303 #ifdef PPPOE_TODO
00304   if (sc->sc_concentrator_name) {
00305     mem_free(sc->sc_concentrator_name);
00306   }
00307   if (sc->sc_service_name) {
00308     mem_free(sc->sc_service_name);
00309   }
00310 #endif /* PPPOE_TODO */
00311   LWIP_MEMPOOL_FREE(PPPOE_IF, sc);
00312 
00313   return ERR_OK;
00314 }
00315 
00316 /*
00317  * Find the interface handling the specified session.
00318  * Note: O(number of sessions open), this is a client-side only, mean
00319  * and lean implementation, so number of open sessions typically should
00320  * be 1.
00321  */
00322 static struct pppoe_softc* pppoe_find_softc_by_session(u_int session, struct netif *rcvif) {
00323   struct pppoe_softc *sc;
00324 
00325   for (sc = pppoe_softc_list; sc != NULL; sc = sc->next) {
00326     if (sc->sc_state == PPPOE_STATE_SESSION
00327         && sc->sc_session == session
00328          && sc->sc_ethif == rcvif) {
00329            return sc;
00330       }
00331   }
00332   return NULL;
00333 }
00334 
00335 /* Check host unique token passed and return appropriate softc pointer,
00336  * or NULL if token is bogus. */
00337 static struct pppoe_softc* pppoe_find_softc_by_hunique(u8_t *token, size_t len, struct netif *rcvif) {
00338   struct pppoe_softc *sc, *t;
00339 
00340   if (len != sizeof sc) {
00341     return NULL;
00342   }
00343   MEMCPY(&t, token, len);
00344 
00345   for (sc = pppoe_softc_list; sc != NULL; sc = sc->next) {
00346     if (sc == t) {
00347       break;
00348     }
00349   }
00350 
00351   if (sc == NULL) {
00352     PPPDEBUG(LOG_DEBUG, ("pppoe: alien host unique tag, no session found\n"));
00353     return NULL;
00354   }
00355 
00356   /* should be safe to access *sc now */
00357   if (sc->sc_state < PPPOE_STATE_PADI_SENT || sc->sc_state >= PPPOE_STATE_SESSION) {
00358     PPPDEBUG(LOG_DEBUG, ("%c%c%"U16_F": host unique tag found, but it belongs to a connection in state %d\n",
00359       sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num, sc->sc_state));
00360     return NULL;
00361   }
00362   if (sc->sc_ethif != rcvif) {
00363     PPPDEBUG(LOG_DEBUG, ("%c%c%"U16_F": wrong interface, not accepting host unique\n",
00364       sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num));
00365     return NULL;
00366   }
00367   return sc;
00368 }
00369 
00370 /* analyze and handle a single received packet while not in session state */
00371 void
00372 pppoe_disc_input(struct netif *netif, struct pbuf *pb)
00373 {
00374   u16_t tag, len;
00375   u16_t session, plen;
00376   struct pppoe_softc *sc;
00377 #if PPP_DEBUG
00378   const char *err_msg = NULL;
00379 #endif /* PPP_DEBUG */
00380   u8_t *ac_cookie;
00381   u16_t ac_cookie_len;
00382 #ifdef PPPOE_SERVER
00383   u8_t *hunique;
00384   size_t hunique_len;
00385 #endif
00386   struct pppoehdr *ph;
00387   struct pppoetag pt;
00388   int off, err;
00389   struct eth_hdr *ethhdr;
00390 
00391   /* don't do anything if there is not a single PPPoE instance */
00392   if (pppoe_softc_list == NULL) {
00393     pbuf_free(pb);
00394     return;
00395   }
00396 
00397   pb = ppp_singlebuf(pb);
00398 
00399   if (pb->len < sizeof(*ethhdr)) {
00400     goto done;
00401   }
00402   ethhdr = (struct eth_hdr *)pb->payload;
00403   off = sizeof(*ethhdr);
00404 
00405   ac_cookie = NULL;
00406   ac_cookie_len = 0;
00407 #ifdef PPPOE_SERVER
00408   hunique = NULL;
00409   hunique_len = 0;
00410 #endif
00411   session = 0;
00412   if (pb->len - off < (u16_t)PPPOE_HEADERLEN) {
00413     PPPDEBUG(LOG_DEBUG, ("pppoe: packet too short: %d\n", pb->len));
00414     goto done;
00415   }
00416 
00417   ph = (struct pppoehdr *) (ethhdr + 1);
00418   if (ph->vertype != PPPOE_VERTYPE) {
00419     PPPDEBUG(LOG_DEBUG, ("pppoe: unknown version/type packet: 0x%x\n", ph->vertype));
00420     goto done;
00421   }
00422   session = lwip_ntohs(ph->session);
00423   plen = lwip_ntohs(ph->plen);
00424   off += sizeof(*ph);
00425 
00426   if (plen + off > pb->len) {
00427     PPPDEBUG(LOG_DEBUG, ("pppoe: packet content does not fit: data available = %d, packet size = %u\n",
00428         pb->len - off, plen));
00429     goto done;
00430   }
00431   if(pb->tot_len == pb->len) {
00432     pb->tot_len = pb->len = (u16_t)off + plen; /* ignore trailing garbage */
00433   }
00434   tag = 0;
00435   len = 0;
00436   sc = NULL;
00437   while (off + sizeof(pt) <= pb->len) {
00438     MEMCPY(&pt, (u8_t*)pb->payload + off, sizeof(pt));
00439     tag = lwip_ntohs(pt.tag);
00440     len = lwip_ntohs(pt.len);
00441     if (off + sizeof(pt) + len > pb->len) {
00442       PPPDEBUG(LOG_DEBUG, ("pppoe: tag 0x%x len 0x%x is too long\n", tag, len));
00443       goto done;
00444     }
00445     switch (tag) {
00446       case PPPOE_TAG_EOL:
00447         goto breakbreak;
00448       case PPPOE_TAG_SNAME:
00449         break;  /* ignored */
00450       case PPPOE_TAG_ACNAME:
00451         break;  /* ignored */
00452       case PPPOE_TAG_HUNIQUE:
00453         if (sc != NULL) {
00454           break;
00455         }
00456 #ifdef PPPOE_SERVER
00457         hunique = (u8_t*)pb->payload + off + sizeof(pt);
00458         hunique_len = len;
00459 #endif
00460         sc = pppoe_find_softc_by_hunique((u8_t*)pb->payload + off + sizeof(pt), len, netif);
00461         break;
00462       case PPPOE_TAG_ACCOOKIE:
00463         if (ac_cookie == NULL) {
00464           if (len > PPPOE_MAX_AC_COOKIE_LEN) {
00465             PPPDEBUG(LOG_DEBUG, ("pppoe: AC cookie is too long: len = %d, max = %d\n", len, PPPOE_MAX_AC_COOKIE_LEN));
00466             goto done;
00467           }
00468           ac_cookie = (u8_t*)pb->payload + off + sizeof(pt);
00469           ac_cookie_len = len;
00470         }
00471         break;
00472 #if PPP_DEBUG
00473       case PPPOE_TAG_SNAME_ERR:
00474         err_msg = "SERVICE NAME ERROR";
00475         break;
00476       case PPPOE_TAG_ACSYS_ERR:
00477         err_msg = "AC SYSTEM ERROR";
00478         break;
00479       case PPPOE_TAG_GENERIC_ERR:
00480         err_msg = "GENERIC ERROR";
00481         break;
00482 #endif /* PPP_DEBUG */
00483       default:
00484         break;
00485     }
00486 #if PPP_DEBUG
00487     if (err_msg != NULL) {
00488       char error_tmp[PPPOE_ERRORSTRING_LEN];
00489       u16_t error_len = LWIP_MIN(len, sizeof(error_tmp)-1);
00490       strncpy(error_tmp, (char*)pb->payload + off + sizeof(pt), error_len);
00491       error_tmp[error_len] = '\0';
00492       if (sc) {
00493         PPPDEBUG(LOG_DEBUG, ("pppoe: %c%c%"U16_F": %s: %s\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num, err_msg, error_tmp));
00494       } else {
00495         PPPDEBUG(LOG_DEBUG, ("pppoe: %s: %s\n", err_msg, error_tmp));
00496       }
00497     }
00498 #endif /* PPP_DEBUG */
00499     off += sizeof(pt) + len;
00500   }
00501 
00502 breakbreak:;
00503   switch (ph->code) {
00504     case PPPOE_CODE_PADI:
00505 #ifdef PPPOE_SERVER
00506       /*
00507        * got service name, concentrator name, and/or host unique.
00508        * ignore if we have no interfaces with IFF_PASSIVE|IFF_UP.
00509        */
00510       if (LIST_EMPTY(&pppoe_softc_list)) {
00511         goto done;
00512       }
00513       LIST_FOREACH(sc, &pppoe_softc_list, sc_list) {
00514         if (!(sc->sc_sppp.pp_if.if_flags & IFF_UP)) {
00515           continue;
00516         }
00517         if (!(sc->sc_sppp.pp_if.if_flags & IFF_PASSIVE)) {
00518           continue;
00519         }
00520         if (sc->sc_state == PPPOE_STATE_INITIAL) {
00521           break;
00522         }
00523       }
00524       if (sc == NULL) {
00525         /* PPPDEBUG(LOG_DEBUG, ("pppoe: free passive interface is not found\n")); */
00526         goto done;
00527       }
00528       if (hunique) {
00529         if (sc->sc_hunique) {
00530           mem_free(sc->sc_hunique);
00531         }
00532         sc->sc_hunique = mem_malloc(hunique_len);
00533         if (sc->sc_hunique == NULL) {
00534           goto done;
00535         }
00536         sc->sc_hunique_len = hunique_len;
00537         MEMCPY(sc->sc_hunique, hunique, hunique_len);
00538       }
00539       MEMCPY(&sc->sc_dest, eh->ether_shost, sizeof sc->sc_dest);
00540       sc->sc_state = PPPOE_STATE_PADO_SENT;
00541       pppoe_send_pado(sc);
00542       break;
00543 #endif /* PPPOE_SERVER */
00544     case PPPOE_CODE_PADR:
00545 #ifdef PPPOE_SERVER
00546       /*
00547        * get sc from ac_cookie if IFF_PASSIVE
00548        */
00549       if (ac_cookie == NULL) {
00550         /* be quiet if there is not a single pppoe instance */
00551         PPPDEBUG(LOG_DEBUG, ("pppoe: received PADR but not includes ac_cookie\n"));
00552         goto done;
00553       }
00554       sc = pppoe_find_softc_by_hunique(ac_cookie, ac_cookie_len, netif);
00555       if (sc == NULL) {
00556         /* be quiet if there is not a single pppoe instance */
00557         if (!LIST_EMPTY(&pppoe_softc_list)) {
00558           PPPDEBUG(LOG_DEBUG, ("pppoe: received PADR but could not find request for it\n"));
00559         }
00560         goto done;
00561       }
00562       if (sc->sc_state != PPPOE_STATE_PADO_SENT) {
00563         PPPDEBUG(LOG_DEBUG, ("%c%c%"U16_F": received unexpected PADR\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num));
00564         goto done;
00565       }
00566       if (hunique) {
00567         if (sc->sc_hunique) {
00568           mem_free(sc->sc_hunique);
00569         }
00570         sc->sc_hunique = mem_malloc(hunique_len);
00571         if (sc->sc_hunique == NULL) {
00572           goto done;
00573         }
00574         sc->sc_hunique_len = hunique_len;
00575         MEMCPY(sc->sc_hunique, hunique, hunique_len);
00576       }
00577       pppoe_send_pads(sc);
00578       sc->sc_state = PPPOE_STATE_SESSION;
00579       ppp_start(sc->pcb); /* notify upper layers */
00580       break;
00581 #else
00582       /* ignore, we are no access concentrator */
00583       goto done;
00584 #endif /* PPPOE_SERVER */
00585     case PPPOE_CODE_PADO:
00586       if (sc == NULL) {
00587         /* be quiet if there is not a single pppoe instance */
00588         if (pppoe_softc_list != NULL) {
00589           PPPDEBUG(LOG_DEBUG, ("pppoe: received PADO but could not find request for it\n"));
00590         }
00591         goto done;
00592       }
00593       if (sc->sc_state != PPPOE_STATE_PADI_SENT) {
00594         PPPDEBUG(LOG_DEBUG, ("%c%c%"U16_F": received unexpected PADO\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num));
00595         goto done;
00596       }
00597       if (ac_cookie) {
00598         sc->sc_ac_cookie_len = ac_cookie_len;
00599         MEMCPY(sc->sc_ac_cookie, ac_cookie, ac_cookie_len);
00600       }
00601       MEMCPY(&sc->sc_dest, ethhdr->src.addr, sizeof(sc->sc_dest.addr));
00602       sys_untimeout(pppoe_timeout, sc);
00603       sc->sc_padr_retried = 0;
00604       sc->sc_state = PPPOE_STATE_PADR_SENT;
00605       if ((err = pppoe_send_padr(sc)) != 0) {
00606         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));
00607       }
00608       sys_timeout(PPPOE_DISC_TIMEOUT * (1 + sc->sc_padr_retried), pppoe_timeout, sc);
00609       break;
00610     case PPPOE_CODE_PADS:
00611       if (sc == NULL) {
00612         goto done;
00613       }
00614       sc->sc_session = session;
00615       sys_untimeout(pppoe_timeout, sc);
00616       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));
00617       sc->sc_state = PPPOE_STATE_SESSION;
00618       ppp_start(sc->pcb); /* notify upper layers */
00619       break;
00620     case PPPOE_CODE_PADT:
00621       /* Don't disconnect here, we let the LCP Echo/Reply find the fact
00622        * that PPP session is down. Asking the PPP stack to end the session
00623        * require strict checking about the PPP phase to prevent endless
00624        * disconnection loops.
00625        */
00626 #if 0 /* UNUSED */
00627       if (sc == NULL) { /* PADT frames are rarely sent with a hunique tag, this is actually almost always true */
00628         goto done;
00629       }
00630       pppoe_clear_softc(sc, "received PADT");
00631 #endif /* UNUSED */
00632       break;
00633     default:
00634       if(sc) {
00635         PPPDEBUG(LOG_DEBUG, ("%c%c%"U16_F": unknown code (0x%"X16_F") session = 0x%"X16_F"\n",
00636             sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num,
00637             (u16_t)ph->code, session));
00638       } else {
00639         PPPDEBUG(LOG_DEBUG, ("pppoe: unknown code (0x%"X16_F") session = 0x%"X16_F"\n", (u16_t)ph->code, session));
00640       }
00641       break;
00642   }
00643 
00644 done:
00645   pbuf_free(pb);
00646   return;
00647 }
00648 
00649 void
00650 pppoe_data_input(struct netif *netif, struct pbuf *pb)
00651 {
00652   u16_t session, plen;
00653   struct pppoe_softc *sc;
00654   struct pppoehdr *ph;
00655 #ifdef PPPOE_TERM_UNKNOWN_SESSIONS
00656   u8_t shost[ETHER_ADDR_LEN];
00657 #endif
00658 
00659 #ifdef PPPOE_TERM_UNKNOWN_SESSIONS
00660   MEMCPY(shost, ((struct eth_hdr *)pb->payload)->src.addr, sizeof(shost));
00661 #endif
00662   if (pbuf_header(pb, -(s16_t)sizeof(struct eth_hdr)) != 0) {
00663     /* bail out */
00664     PPPDEBUG(LOG_ERR, ("pppoe_data_input: pbuf_header failed\n"));
00665     LINK_STATS_INC(link.lenerr);
00666     goto drop;
00667   } 
00668 
00669   if (pb->len < sizeof(*ph)) {
00670     PPPDEBUG(LOG_DEBUG, ("pppoe_data_input: could not get PPPoE header\n"));
00671     goto drop;
00672   }
00673   ph = (struct pppoehdr *)pb->payload;
00674 
00675   if (ph->vertype != PPPOE_VERTYPE) {
00676     PPPDEBUG(LOG_DEBUG, ("pppoe (data): unknown version/type packet: 0x%x\n", ph->vertype));
00677     goto drop;
00678   }
00679   if (ph->code != 0) {
00680     goto drop;
00681   }
00682 
00683   session = lwip_ntohs(ph->session);
00684   sc = pppoe_find_softc_by_session(session, netif);
00685   if (sc == NULL) {
00686 #ifdef PPPOE_TERM_UNKNOWN_SESSIONS
00687     PPPDEBUG(LOG_DEBUG, ("pppoe: input for unknown session 0x%x, sending PADT\n", session));
00688     pppoe_send_padt(netif, session, shost);
00689 #endif
00690     goto drop;
00691   }
00692 
00693   plen = lwip_ntohs(ph->plen);
00694 
00695   if (pbuf_header(pb, -(s16_t)(PPPOE_HEADERLEN)) != 0) {
00696     /* bail out */
00697     PPPDEBUG(LOG_ERR, ("pppoe_data_input: pbuf_header PPPOE_HEADERLEN failed\n"));
00698     LINK_STATS_INC(link.lenerr);
00699     goto drop;
00700   } 
00701 
00702   PPPDEBUG(LOG_DEBUG, ("pppoe_data_input: %c%c%"U16_F": pkthdr.len=%d, pppoe.len=%d\n",
00703         sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num,
00704         pb->len, plen));
00705 
00706   if (pb->tot_len < plen) {
00707     goto drop;
00708   }
00709 
00710   /* Dispatch the packet thereby consuming it. */
00711   ppp_input(sc->pcb, pb);
00712   return;
00713 
00714 drop:
00715   pbuf_free(pb);
00716 }
00717 
00718 static err_t
00719 pppoe_output(struct pppoe_softc *sc, struct pbuf *pb)
00720 {
00721   struct eth_hdr *ethhdr;
00722   u16_t etype;
00723   err_t res;
00724 
00725   /* make room for Ethernet header - should not fail */
00726   if (pbuf_header(pb, (s16_t)(sizeof(struct eth_hdr))) != 0) {
00727     /* bail out */
00728     PPPDEBUG(LOG_ERR, ("pppoe: %c%c%"U16_F": pppoe_output: could not allocate room for Ethernet header\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num));
00729     LINK_STATS_INC(link.lenerr);
00730     pbuf_free(pb);
00731     return ERR_BUF;
00732   }
00733   ethhdr = (struct eth_hdr *)pb->payload;
00734   etype = sc->sc_state == PPPOE_STATE_SESSION ? ETHTYPE_PPPOE : ETHTYPE_PPPOEDISC;
00735   ethhdr->type = lwip_htons(etype);
00736   MEMCPY(&ethhdr->dest.addr, &sc->sc_dest.addr, sizeof(ethhdr->dest.addr));
00737   MEMCPY(&ethhdr->src.addr, &sc->sc_ethif->hwaddr, sizeof(ethhdr->src.addr));
00738 
00739   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",
00740       sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num, etype,
00741       sc->sc_state, sc->sc_session,
00742       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],
00743       pb->tot_len));
00744 
00745   res = sc->sc_ethif->linkoutput(sc->sc_ethif, pb);
00746 
00747   pbuf_free(pb);
00748 
00749   return res;
00750 }
00751 
00752 static err_t
00753 pppoe_send_padi(struct pppoe_softc *sc)
00754 {
00755   struct pbuf *pb;
00756   u8_t *p;
00757   int len;
00758 #ifdef PPPOE_TODO
00759   int l1 = 0, l2 = 0; /* XXX: gcc */
00760 #endif /* PPPOE_TODO */
00761 
00762   /* calculate length of frame (excluding ethernet header + pppoe header) */
00763   len = 2 + 2 + 2 + 2 + sizeof sc;  /* service name tag is required, host unique is send too */
00764 #ifdef PPPOE_TODO
00765   if (sc->sc_service_name != NULL) {
00766     l1 = (int)strlen(sc->sc_service_name);
00767     len += l1;
00768   }
00769   if (sc->sc_concentrator_name != NULL) {
00770     l2 = (int)strlen(sc->sc_concentrator_name);
00771     len += 2 + 2 + l2;
00772   }
00773 #endif /* PPPOE_TODO */
00774   LWIP_ASSERT("sizeof(struct eth_hdr) + PPPOE_HEADERLEN + len <= 0xffff",
00775     sizeof(struct eth_hdr) + PPPOE_HEADERLEN + len <= 0xffff);
00776 
00777   /* allocate a buffer */
00778   pb = pbuf_alloc(PBUF_LINK, (u16_t)(PPPOE_HEADERLEN + len), PBUF_RAM);
00779   if (!pb) {
00780     return ERR_MEM;
00781   }
00782   LWIP_ASSERT("pb->tot_len == pb->len", pb->tot_len == pb->len);
00783 
00784   p = (u8_t*)pb->payload;
00785   /* fill in pkt */
00786   PPPOE_ADD_HEADER(p, PPPOE_CODE_PADI, 0, (u16_t)len);
00787   PPPOE_ADD_16(p, PPPOE_TAG_SNAME);
00788 #ifdef PPPOE_TODO
00789   if (sc->sc_service_name != NULL) {
00790     PPPOE_ADD_16(p, l1);
00791     MEMCPY(p, sc->sc_service_name, l1);
00792     p += l1;
00793   } else
00794 #endif /* PPPOE_TODO */
00795   {
00796     PPPOE_ADD_16(p, 0);
00797   }
00798 #ifdef PPPOE_TODO
00799   if (sc->sc_concentrator_name != NULL) {
00800     PPPOE_ADD_16(p, PPPOE_TAG_ACNAME);
00801     PPPOE_ADD_16(p, l2);
00802     MEMCPY(p, sc->sc_concentrator_name, l2);
00803     p += l2;
00804   }
00805 #endif /* PPPOE_TODO */
00806   PPPOE_ADD_16(p, PPPOE_TAG_HUNIQUE);
00807   PPPOE_ADD_16(p, sizeof(sc));
00808   MEMCPY(p, &sc, sizeof sc);
00809 
00810   /* send pkt */
00811   return pppoe_output(sc, pb);
00812 }
00813 
00814 static void
00815 pppoe_timeout(void *arg)
00816 {
00817   u32_t retry_wait;
00818   int err;
00819   struct pppoe_softc *sc = (struct pppoe_softc*)arg;
00820 
00821   PPPDEBUG(LOG_DEBUG, ("pppoe: %c%c%"U16_F": timeout\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num));
00822 
00823   switch (sc->sc_state) {
00824     case PPPOE_STATE_PADI_SENT:
00825       /*
00826        * We have two basic ways of retrying:
00827        *  - Quick retry mode: try a few times in short sequence
00828        *  - Slow retry mode: we already had a connection successfully
00829        *    established and will try infinitely (without user
00830        *    intervention)
00831        * We only enter slow retry mode if IFF_LINK1 (aka autodial)
00832        * is not set.
00833        */
00834       if (sc->sc_padi_retried < 0xff) {
00835         sc->sc_padi_retried++;
00836       }
00837       if (!sc->pcb->settings.persist && sc->sc_padi_retried >= PPPOE_DISC_MAXPADI) {
00838 #if 0
00839         if ((sc->sc_sppp.pp_if.if_flags & IFF_LINK1) == 0) {
00840           /* slow retry mode */
00841           retry_wait = PPPOE_SLOW_RETRY;
00842         } else
00843 #endif
00844         {
00845           pppoe_abort_connect(sc);
00846           return;
00847         }
00848       }
00849       /* initialize for quick retry mode */
00850       retry_wait = LWIP_MIN(PPPOE_DISC_TIMEOUT * sc->sc_padi_retried, PPPOE_SLOW_RETRY);
00851       if ((err = pppoe_send_padi(sc)) != 0) {
00852         sc->sc_padi_retried--;
00853         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));
00854       }
00855       sys_timeout(retry_wait, pppoe_timeout, sc);
00856       break;
00857 
00858     case PPPOE_STATE_PADR_SENT:
00859       sc->sc_padr_retried++;
00860       if (sc->sc_padr_retried >= PPPOE_DISC_MAXPADR) {
00861         MEMCPY(&sc->sc_dest, ethbroadcast.addr, sizeof(sc->sc_dest));
00862         sc->sc_state = PPPOE_STATE_PADI_SENT;
00863         sc->sc_padr_retried = 0;
00864         if ((err = pppoe_send_padi(sc)) != 0) {
00865           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));
00866         }
00867         sys_timeout(PPPOE_DISC_TIMEOUT * (1 + sc->sc_padi_retried), pppoe_timeout, sc);
00868         return;
00869       }
00870       if ((err = pppoe_send_padr(sc)) != 0) {
00871         sc->sc_padr_retried--;
00872         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));
00873       }
00874       sys_timeout(PPPOE_DISC_TIMEOUT * (1 + sc->sc_padr_retried), pppoe_timeout, sc);
00875       break;
00876     default:
00877       return;  /* all done, work in peace */
00878   }
00879 }
00880 
00881 /* Start a connection (i.e. initiate discovery phase) */
00882 static void
00883 pppoe_connect(ppp_pcb *ppp, void *ctx)
00884 {
00885   err_t err;
00886   struct pppoe_softc *sc = (struct pppoe_softc *)ctx;
00887   lcp_options *lcp_wo;
00888   lcp_options *lcp_ao;
00889 #if PPP_IPV4_SUPPORT && VJ_SUPPORT
00890   ipcp_options *ipcp_wo;
00891   ipcp_options *ipcp_ao;
00892 #endif /* PPP_IPV4_SUPPORT && VJ_SUPPORT */
00893 
00894   sc->sc_session = 0;
00895   sc->sc_ac_cookie_len = 0;
00896   sc->sc_padi_retried = 0;
00897   sc->sc_padr_retried = 0;
00898   /* changed to real address later */
00899   MEMCPY(&sc->sc_dest, ethbroadcast.addr, sizeof(sc->sc_dest));
00900 #ifdef PPPOE_SERVER
00901   /* wait PADI if IFF_PASSIVE */
00902   if ((sc->sc_sppp.pp_if.if_flags & IFF_PASSIVE)) {
00903     return 0;
00904   }
00905 #endif
00906 
00907   lcp_wo = &ppp->lcp_wantoptions;
00908   lcp_wo->mru = sc->sc_ethif->mtu-PPPOE_HEADERLEN-2; /* two byte PPP protocol discriminator, then IP data */
00909   lcp_wo->neg_asyncmap = 0;
00910   lcp_wo->neg_pcompression = 0;
00911   lcp_wo->neg_accompression = 0;
00912   lcp_wo->passive = 0;
00913   lcp_wo->silent = 0;
00914 
00915   lcp_ao = &ppp->lcp_allowoptions;
00916   lcp_ao->mru = sc->sc_ethif->mtu-PPPOE_HEADERLEN-2; /* two byte PPP protocol discriminator, then IP data */
00917   lcp_ao->neg_asyncmap = 0;
00918   lcp_ao->neg_pcompression = 0;
00919   lcp_ao->neg_accompression = 0;
00920 
00921 #if PPP_IPV4_SUPPORT && VJ_SUPPORT
00922   ipcp_wo = &ppp->ipcp_wantoptions;
00923   ipcp_wo->neg_vj = 0;
00924   ipcp_wo->old_vj = 0;
00925 
00926   ipcp_ao = &ppp->ipcp_allowoptions;
00927   ipcp_ao->neg_vj = 0;
00928   ipcp_ao->old_vj = 0;
00929 #endif /* PPP_IPV4_SUPPORT && VJ_SUPPORT */
00930 
00931   /* save state, in case we fail to send PADI */
00932   sc->sc_state = PPPOE_STATE_PADI_SENT;
00933   if ((err = pppoe_send_padi(sc)) != 0) {
00934     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));
00935   }
00936   sys_timeout(PPPOE_DISC_TIMEOUT, pppoe_timeout, sc);
00937 }
00938 
00939 /* disconnect */
00940 static void
00941 pppoe_disconnect(ppp_pcb *ppp, void *ctx)
00942 {
00943   struct pppoe_softc *sc = (struct pppoe_softc *)ctx;
00944 
00945   PPPDEBUG(LOG_DEBUG, ("pppoe: %c%c%"U16_F": disconnecting\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num));
00946   if (sc->sc_state == PPPOE_STATE_SESSION) {
00947     pppoe_send_padt(sc->sc_ethif, sc->sc_session, (const u8_t *)&sc->sc_dest);
00948   }
00949 
00950   /* stop any timer, disconnect can be called while initiating is in progress */
00951   sys_untimeout(pppoe_timeout, sc);
00952   sc->sc_state = PPPOE_STATE_INITIAL;
00953 #ifdef PPPOE_SERVER
00954   if (sc->sc_hunique) {
00955     mem_free(sc->sc_hunique);
00956     sc->sc_hunique = NULL; /* probably not necessary, if state is initial we shouldn't have to access hunique anyway  */
00957   }
00958   sc->sc_hunique_len = 0; /* probably not necessary, if state is initial we shouldn't have to access hunique anyway  */
00959 #endif
00960   ppp_link_end(ppp); /* notify upper layers */
00961   return;
00962 }
00963 
00964 /* Connection attempt aborted */
00965 static void
00966 pppoe_abort_connect(struct pppoe_softc *sc)
00967 {
00968   PPPDEBUG(LOG_DEBUG, ("%c%c%"U16_F": could not establish connection\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num));
00969   sc->sc_state = PPPOE_STATE_INITIAL;
00970   ppp_link_failed(sc->pcb); /* notify upper layers */
00971 }
00972 
00973 /* Send a PADR packet */
00974 static err_t
00975 pppoe_send_padr(struct pppoe_softc *sc)
00976 {
00977   struct pbuf *pb;
00978   u8_t *p;
00979   size_t len;
00980 #ifdef PPPOE_TODO
00981   size_t l1 = 0; /* XXX: gcc */
00982 #endif /* PPPOE_TODO */
00983 
00984   len = 2 + 2 + 2 + 2 + sizeof(sc);    /* service name, host unique */
00985 #ifdef PPPOE_TODO
00986   if (sc->sc_service_name != NULL) {    /* service name tag maybe empty */
00987     l1 = strlen(sc->sc_service_name);
00988     len += l1;
00989   }
00990 #endif /* PPPOE_TODO */
00991   if (sc->sc_ac_cookie_len > 0) {
00992     len += 2 + 2 + sc->sc_ac_cookie_len;  /* AC cookie */
00993   }
00994   LWIP_ASSERT("sizeof(struct eth_hdr) + PPPOE_HEADERLEN + len <= 0xffff",
00995     sizeof(struct eth_hdr) + PPPOE_HEADERLEN + len <= 0xffff);
00996   pb = pbuf_alloc(PBUF_LINK, (u16_t)(PPPOE_HEADERLEN + len), PBUF_RAM);
00997   if (!pb) {
00998     return ERR_MEM;
00999   }
01000   LWIP_ASSERT("pb->tot_len == pb->len", pb->tot_len == pb->len);
01001   p = (u8_t*)pb->payload;
01002   PPPOE_ADD_HEADER(p, PPPOE_CODE_PADR, 0, len);
01003   PPPOE_ADD_16(p, PPPOE_TAG_SNAME);
01004 #ifdef PPPOE_TODO
01005   if (sc->sc_service_name != NULL) {
01006     PPPOE_ADD_16(p, l1);
01007     MEMCPY(p, sc->sc_service_name, l1);
01008     p += l1;
01009   } else
01010 #endif /* PPPOE_TODO */
01011   {
01012     PPPOE_ADD_16(p, 0);
01013   }
01014   if (sc->sc_ac_cookie_len > 0) {
01015     PPPOE_ADD_16(p, PPPOE_TAG_ACCOOKIE);
01016     PPPOE_ADD_16(p, sc->sc_ac_cookie_len);
01017     MEMCPY(p, sc->sc_ac_cookie, sc->sc_ac_cookie_len);
01018     p += sc->sc_ac_cookie_len;
01019   }
01020   PPPOE_ADD_16(p, PPPOE_TAG_HUNIQUE);
01021   PPPOE_ADD_16(p, sizeof(sc));
01022   MEMCPY(p, &sc, sizeof sc);
01023 
01024   return pppoe_output(sc, pb);
01025 }
01026 
01027 /* send a PADT packet */
01028 static err_t
01029 pppoe_send_padt(struct netif *outgoing_if, u_int session, const u8_t *dest)
01030 {
01031   struct pbuf *pb;
01032   struct eth_hdr *ethhdr;
01033   err_t res;
01034   u8_t *p;
01035 
01036   pb = pbuf_alloc(PBUF_LINK, (u16_t)(PPPOE_HEADERLEN), PBUF_RAM);
01037   if (!pb) {
01038     return ERR_MEM;
01039   }
01040   LWIP_ASSERT("pb->tot_len == pb->len", pb->tot_len == pb->len);
01041 
01042   pbuf_header(pb, (s16_t)sizeof(struct eth_hdr));
01043   ethhdr = (struct eth_hdr *)pb->payload;
01044   ethhdr->type = PP_HTONS(ETHTYPE_PPPOEDISC);
01045   MEMCPY(&ethhdr->dest.addr, dest, sizeof(ethhdr->dest.addr));
01046   MEMCPY(&ethhdr->src.addr, &outgoing_if->hwaddr, sizeof(ethhdr->src.addr));
01047 
01048   p = (u8_t*)(ethhdr + 1);
01049   PPPOE_ADD_HEADER(p, PPPOE_CODE_PADT, session, 0);
01050 
01051   res = outgoing_if->linkoutput(outgoing_if, pb);
01052 
01053   pbuf_free(pb);
01054 
01055   return res;
01056 }
01057 
01058 #ifdef PPPOE_SERVER
01059 static err_t
01060 pppoe_send_pado(struct pppoe_softc *sc)
01061 {
01062   struct pbuf *pb;
01063   u8_t *p;
01064   size_t len;
01065 
01066   /* calc length */
01067   len = 0;
01068   /* include ac_cookie */
01069   len += 2 + 2 + sizeof(sc);
01070   /* include hunique */
01071   len += 2 + 2 + sc->sc_hunique_len;
01072   pb = pbuf_alloc(PBUF_LINK, (u16_t)(PPPOE_HEADERLEN + len), PBUF_RAM);
01073   if (!pb) {
01074     return ERR_MEM;
01075   }
01076   LWIP_ASSERT("pb->tot_len == pb->len", pb->tot_len == pb->len);
01077   p = (u8_t*)pb->payload;
01078   PPPOE_ADD_HEADER(p, PPPOE_CODE_PADO, 0, len);
01079   PPPOE_ADD_16(p, PPPOE_TAG_ACCOOKIE);
01080   PPPOE_ADD_16(p, sizeof(sc));
01081   MEMCPY(p, &sc, sizeof(sc));
01082   p += sizeof(sc);
01083   PPPOE_ADD_16(p, PPPOE_TAG_HUNIQUE);
01084   PPPOE_ADD_16(p, sc->sc_hunique_len);
01085   MEMCPY(p, sc->sc_hunique, sc->sc_hunique_len);
01086   return pppoe_output(sc, pb);
01087 }
01088 
01089 static err_t
01090 pppoe_send_pads(struct pppoe_softc *sc)
01091 {
01092   struct pbuf *pb;
01093   u8_t *p;
01094   size_t len, l1 = 0;  /* XXX: gcc */
01095 
01096   sc->sc_session = mono_time.tv_sec % 0xff + 1;
01097   /* calc length */
01098   len = 0;
01099   /* include hunique */
01100   len += 2 + 2 + 2 + 2 + sc->sc_hunique_len;  /* service name, host unique*/
01101   if (sc->sc_service_name != NULL) {    /* service name tag maybe empty */
01102     l1 = strlen(sc->sc_service_name);
01103     len += l1;
01104   }
01105   pb = pbuf_alloc(PBUF_LINK, (u16_t)(PPPOE_HEADERLEN + len), PBUF_RAM);
01106   if (!pb) {
01107     return ERR_MEM;
01108   }
01109   LWIP_ASSERT("pb->tot_len == pb->len", pb->tot_len == pb->len);
01110   p = (u8_t*)pb->payload;
01111   PPPOE_ADD_HEADER(p, PPPOE_CODE_PADS, sc->sc_session, len);
01112   PPPOE_ADD_16(p, PPPOE_TAG_SNAME);
01113   if (sc->sc_service_name != NULL) {
01114     PPPOE_ADD_16(p, l1);
01115     MEMCPY(p, sc->sc_service_name, l1);
01116     p += l1;
01117   } else {
01118     PPPOE_ADD_16(p, 0);
01119   }
01120   PPPOE_ADD_16(p, PPPOE_TAG_HUNIQUE);
01121   PPPOE_ADD_16(p, sc->sc_hunique_len);
01122   MEMCPY(p, sc->sc_hunique, sc->sc_hunique_len);
01123   return pppoe_output(sc, pb);
01124 }
01125 #endif
01126 
01127 static err_t
01128 pppoe_xmit(struct pppoe_softc *sc, struct pbuf *pb)
01129 {
01130   u8_t *p;
01131   size_t len;
01132 
01133   len = pb->tot_len;
01134 
01135   /* make room for PPPoE header - should not fail */
01136   if (pbuf_header(pb, (s16_t)(PPPOE_HEADERLEN)) != 0) {
01137     /* bail out */
01138     PPPDEBUG(LOG_ERR, ("pppoe: %c%c%"U16_F": pppoe_xmit: could not allocate room for PPPoE header\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num));
01139     LINK_STATS_INC(link.lenerr);
01140     pbuf_free(pb);
01141     return ERR_BUF;
01142   }
01143 
01144   p = (u8_t*)pb->payload;
01145   PPPOE_ADD_HEADER(p, 0, sc->sc_session, len);
01146 
01147   return pppoe_output(sc, pb);
01148 }
01149 
01150 #if 0 /*def PFIL_HOOKS*/
01151 static int
01152 pppoe_ifattach_hook(void *arg, struct pbuf **mp, struct netif *ifp, int dir)
01153 {
01154   struct pppoe_softc *sc;
01155   int s;
01156 
01157   if (mp != (struct pbuf **)PFIL_IFNET_DETACH) {
01158     return 0;
01159   }
01160 
01161   LIST_FOREACH(sc, &pppoe_softc_list, sc_list) {
01162     if (sc->sc_ethif != ifp) {
01163       continue;
01164     }
01165     if (sc->sc_sppp.pp_if.if_flags & IFF_UP) {
01166       sc->sc_sppp.pp_if.if_flags &= ~(IFF_UP|IFF_RUNNING);
01167       PPPDEBUG(LOG_DEBUG, ("%c%c%"U16_F": ethernet interface detached, going down\n",
01168           sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num));
01169     }
01170     sc->sc_ethif = NULL;
01171     pppoe_clear_softc(sc, "ethernet interface detached");
01172   }
01173 
01174   return 0;
01175 }
01176 #endif
01177 
01178 #if 0 /* UNUSED */
01179 static void
01180 pppoe_clear_softc(struct pppoe_softc *sc, const char *message)
01181 {
01182   LWIP_UNUSED_ARG(message);
01183 
01184   /* stop timer */
01185   sys_untimeout(pppoe_timeout, sc);
01186   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));
01187   sc->sc_state = PPPOE_STATE_INITIAL;
01188   ppp_link_end(sc->pcb);  /* notify upper layers - /!\ dangerous /!\ - see pppoe_disc_input() */
01189 }
01190 #endif /* UNUSED */
01191 #endif /* PPP_SUPPORT && PPPOE_SUPPORT */