Sam Walsh
Forked from the DieterGraef Library
Fork of
F7_Ethernet
by 
Dieter Graef
Diff: lwip/netif/ppp/ppp_oe.c
- Revision:
- 0:d26c1b55cfca
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/lwip/netif/ppp/ppp_oe.c Sun Jun 19 16:23:40 2016 +0000
@@ -0,0 +1,1132 @@
+/*****************************************************************************
+* ppp_oe.c - PPP Over Ethernet implementation for lwIP.
+*
+* Copyright (c) 2006 by Marc Boucher, Services Informatiques (MBSI) inc.
+*
+* The authors hereby grant permission to use, copy, modify, distribute,
+* and license this software and its documentation for any purpose, provided
+* that existing copyright notices are retained in all copies and that this
+* notice and the following disclaimer are included verbatim in any
+* distributions. No written agreement, license, or royalty fee is required
+* for any of the authorized uses.
+*
+* THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS *AS IS* AND ANY EXPRESS OR
+* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+* IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*
+******************************************************************************
+* REVISION HISTORY
+*
+* 06-01-01 Marc Boucher <marc@mbsi.ca>
+* Ported to lwIP.
+*****************************************************************************/
+
+
+
+/* based on NetBSD: if_pppoe.c,v 1.64 2006/01/31 23:50:15 martin Exp */
+
+/*-
+ * Copyright (c) 2002 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Martin Husemann <martin@NetBSD.org>.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the NetBSD
+ * Foundation, Inc. and its contributors.
+ * 4. Neither the name of The NetBSD Foundation nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "lwip/opt.h"
+
+#if PPPOE_SUPPORT /* don't build if not configured for use in lwipopts.h */
+
+#include "netif/ppp_oe.h"
+
+#include "ppp_impl.h"
+#include "pppdebug.h"
+
+#include "lwip/timers.h"
+#include "lwip/memp.h"
+
+#include <string.h>
+#include <stdio.h>
+
+
+/* Add a 16 bit unsigned value to a buffer pointed to by PTR */
+#define PPPOE_ADD_16(PTR, VAL) \
+ *(PTR)++ = (u8_t)((VAL) / 256); \
+ *(PTR)++ = (u8_t)((VAL) % 256)
+
+/* Add a complete PPPoE header to the buffer pointed to by PTR */
+#define PPPOE_ADD_HEADER(PTR, CODE, SESS, LEN) \
+ *(PTR)++ = PPPOE_VERTYPE; \
+ *(PTR)++ = (CODE); \
+ PPPOE_ADD_16(PTR, SESS); \
+ PPPOE_ADD_16(PTR, LEN)
+
+#define PPPOE_DISC_TIMEOUT (5*1000) /* base for quick timeout calculation */
+#define PPPOE_SLOW_RETRY (60*1000) /* persistent retry interval */
+#define PPPOE_DISC_MAXPADI 4 /* retry PADI four times (quickly) */
+#define PPPOE_DISC_MAXPADR 2 /* retry PADR twice */
+
+#ifdef PPPOE_SERVER
+#error "PPPOE_SERVER is not yet supported under lwIP!"
+/* from if_spppsubr.c */
+#define IFF_PASSIVE IFF_LINK0 /* wait passively for connection */
+#endif
+
+#ifndef PPPOE_ERRORSTRING_LEN
+#define PPPOE_ERRORSTRING_LEN 64
+#endif
+static char pppoe_error_tmp[PPPOE_ERRORSTRING_LEN];
+
+
+/* input routines */
+static void pppoe_dispatch_disc_pkt(struct netif *, struct pbuf *);
+
+/* management routines */
+static int pppoe_do_disconnect(struct pppoe_softc *);
+static void pppoe_abort_connect(struct pppoe_softc *);
+static void pppoe_clear_softc(struct pppoe_softc *, const char *);
+
+/* internal timeout handling */
+static void pppoe_timeout(void *);
+
+/* sending actual protocol controll packets */
+static err_t pppoe_send_padi(struct pppoe_softc *);
+static err_t pppoe_send_padr(struct pppoe_softc *);
+#ifdef PPPOE_SERVER
+static err_t pppoe_send_pado(struct pppoe_softc *);
+static err_t pppoe_send_pads(struct pppoe_softc *);
+#endif
+static err_t pppoe_send_padt(struct netif *, u_int, const u8_t *);
+
+/* internal helper functions */
+static struct pppoe_softc * pppoe_find_softc_by_session(u_int, struct netif *);
+static struct pppoe_softc * pppoe_find_softc_by_hunique(u8_t *, size_t, struct netif *);
+
+/** linked list of created pppoe interfaces */
+static struct pppoe_softc *pppoe_softc_list;
+
+err_t
+pppoe_create(struct netif *ethif, int pd, void (*linkStatusCB)(int pd, int up), struct pppoe_softc **scptr)
+{
+ struct pppoe_softc *sc;
+
+ sc = (struct pppoe_softc *)memp_malloc(MEMP_PPPOE_IF);
+ if (sc == NULL) {
+ *scptr = NULL;
+ return ERR_MEM;
+ }
+ memset(sc, 0, sizeof(struct pppoe_softc));
+
+ /* changed to real address later */
+ MEMCPY(&sc->sc_dest, ethbroadcast.addr, sizeof(sc->sc_dest));
+
+ sc->sc_pd = pd;
+ sc->sc_linkStatusCB = linkStatusCB;
+ sc->sc_ethif = ethif;
+
+ /* put the new interface at the head of the list */
+ sc->next = pppoe_softc_list;
+ pppoe_softc_list = sc;
+
+ *scptr = sc;
+
+ return ERR_OK;
+}
+
+err_t
+pppoe_destroy(struct netif *ifp)
+{
+ struct pppoe_softc *sc, *prev = NULL;
+
+ for (sc = pppoe_softc_list; sc != NULL; prev = sc, sc = sc->next) {
+ if (sc->sc_ethif == ifp) {
+ break;
+ }
+ }
+
+ if(!(sc && (sc->sc_ethif == ifp))) {
+ return ERR_IF;
+ }
+
+ sys_untimeout(pppoe_timeout, sc);
+ if (prev == NULL) {
+ /* remove sc from the head of the list */
+ pppoe_softc_list = sc->next;
+ } else {
+ /* remove sc from the list */
+ prev->next = sc->next;
+ }
+
+#ifdef PPPOE_TODO
+ if (sc->sc_concentrator_name) {
+ mem_free(sc->sc_concentrator_name);
+ }
+ if (sc->sc_service_name) {
+ mem_free(sc->sc_service_name);
+ }
+#endif /* PPPOE_TODO */
+ memp_free(MEMP_PPPOE_IF, sc);
+
+ return ERR_OK;
+}
+
+/*
+ * Find the interface handling the specified session.
+ * Note: O(number of sessions open), this is a client-side only, mean
+ * and lean implementation, so number of open sessions typically should
+ * be 1.
+ */
+static struct pppoe_softc *
+pppoe_find_softc_by_session(u_int session, struct netif *rcvif)
+{
+ struct pppoe_softc *sc;
+
+ if (session == 0) {
+ return NULL;
+ }
+
+ for (sc = pppoe_softc_list; sc != NULL; sc = sc->next) {
+ if (sc->sc_state == PPPOE_STATE_SESSION
+ && sc->sc_session == session) {
+ if (sc->sc_ethif == rcvif) {
+ return sc;
+ } else {
+ return NULL;
+ }
+ }
+ }
+ return NULL;
+}
+
+/* Check host unique token passed and return appropriate softc pointer,
+ * or NULL if token is bogus. */
+static struct pppoe_softc *
+pppoe_find_softc_by_hunique(u8_t *token, size_t len, struct netif *rcvif)
+{
+ struct pppoe_softc *sc, *t;
+
+ if (pppoe_softc_list == NULL) {
+ return NULL;
+ }
+
+ if (len != sizeof sc) {
+ return NULL;
+ }
+ MEMCPY(&t, token, len);
+
+ for (sc = pppoe_softc_list; sc != NULL; sc = sc->next) {
+ if (sc == t) {
+ break;
+ }
+ }
+
+ if (sc == NULL) {
+ PPPDEBUG(LOG_DEBUG, ("pppoe: alien host unique tag, no session found\n"));
+ return NULL;
+ }
+
+ /* should be safe to access *sc now */
+ if (sc->sc_state < PPPOE_STATE_PADI_SENT || sc->sc_state >= PPPOE_STATE_SESSION) {
+ printf("%c%c%"U16_F": host unique tag found, but it belongs to a connection in state %d\n",
+ sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num, sc->sc_state);
+ return NULL;
+ }
+ if (sc->sc_ethif != rcvif) {
+ printf("%c%c%"U16_F": wrong interface, not accepting host unique\n",
+ sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num);
+ return NULL;
+ }
+ return sc;
+}
+
+static void
+pppoe_linkstatus_up(struct pppoe_softc *sc)
+{
+ sc->sc_linkStatusCB(sc->sc_pd, 1);
+}
+
+/* analyze and handle a single received packet while not in session state */
+static void
+pppoe_dispatch_disc_pkt(struct netif *netif, struct pbuf *pb)
+{
+ u16_t tag, len;
+ u16_t session, plen;
+ struct pppoe_softc *sc;
+ const char *err_msg;
+ char devname[6];
+ u8_t *ac_cookie;
+ u16_t ac_cookie_len;
+#ifdef PPPOE_SERVER
+ u8_t *hunique;
+ size_t hunique_len;
+#endif
+ struct pppoehdr *ph;
+ struct pppoetag pt;
+ int off, err, errortag;
+ struct eth_hdr *ethhdr;
+
+ pb = pppSingleBuf(pb);
+
+ strcpy(devname, "pppoe"); /* as long as we don't know which instance */
+ err_msg = NULL;
+ errortag = 0;
+ if (pb->len < sizeof(*ethhdr)) {
+ goto done;
+ }
+ ethhdr = (struct eth_hdr *)pb->payload;
+ off = sizeof(*ethhdr);
+
+ ac_cookie = NULL;
+ ac_cookie_len = 0;
+#ifdef PPPOE_SERVER
+ hunique = NULL;
+ hunique_len = 0;
+#endif
+ session = 0;
+ if (pb->len - off < PPPOE_HEADERLEN) {
+ printf("pppoe: packet too short: %d\n", pb->len);
+ goto done;
+ }
+
+ ph = (struct pppoehdr *) (ethhdr + 1);
+ if (ph->vertype != PPPOE_VERTYPE) {
+ printf("pppoe: unknown version/type packet: 0x%x\n", ph->vertype);
+ goto done;
+ }
+ session = ntohs(ph->session);
+ plen = ntohs(ph->plen);
+ off += sizeof(*ph);
+
+ if (plen + off > pb->len) {
+ printf("pppoe: packet content does not fit: data available = %d, packet size = %u\n",
+ pb->len - off, plen);
+ goto done;
+ }
+ if(pb->tot_len == pb->len) {
+ pb->tot_len = pb->len = (u16_t)off + plen; /* ignore trailing garbage */
+ }
+ tag = 0;
+ len = 0;
+ sc = NULL;
+ while (off + sizeof(pt) <= pb->len) {
+ MEMCPY(&pt, (u8_t*)pb->payload + off, sizeof(pt));
+ tag = ntohs(pt.tag);
+ len = ntohs(pt.len);
+ if (off + sizeof(pt) + len > pb->len) {
+ printf("pppoe: tag 0x%x len 0x%x is too long\n", tag, len);
+ goto done;
+ }
+ switch (tag) {
+ case PPPOE_TAG_EOL:
+ goto breakbreak;
+ case PPPOE_TAG_SNAME:
+ break; /* ignored */
+ case PPPOE_TAG_ACNAME:
+ break; /* ignored */
+ case PPPOE_TAG_HUNIQUE:
+ if (sc != NULL) {
+ break;
+ }
+#ifdef PPPOE_SERVER
+ hunique = (u8_t*)pb->payload + off + sizeof(pt);
+ hunique_len = len;
+#endif
+ sc = pppoe_find_softc_by_hunique((u8_t*)pb->payload + off + sizeof(pt), len, netif);
+ if (sc != NULL) {
+ snprintf(devname, sizeof(devname), "%c%c%"U16_F, sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num);
+ }
+ break;
+ case PPPOE_TAG_ACCOOKIE:
+ if (ac_cookie == NULL) {
+ ac_cookie = (u8_t*)pb->payload + off + sizeof(pt);
+ ac_cookie_len = len;
+ }
+ break;
+ case PPPOE_TAG_SNAME_ERR:
+ err_msg = "SERVICE NAME ERROR";
+ errortag = 1;
+ break;
+ case PPPOE_TAG_ACSYS_ERR:
+ err_msg = "AC SYSTEM ERROR";
+ errortag = 1;
+ break;
+ case PPPOE_TAG_GENERIC_ERR:
+ err_msg = "GENERIC ERROR";
+ errortag = 1;
+ break;
+ }
+ if (err_msg) {
+ if (errortag && len) {
+ u16_t error_len = LWIP_MIN(len, sizeof(pppoe_error_tmp)-1);
+ strncpy(pppoe_error_tmp, (char*)pb->payload + off + sizeof(pt), error_len);
+ pppoe_error_tmp[error_len-1] = '\0';
+ printf("%s: %s: %s\n", devname, err_msg, pppoe_error_tmp);
+ } else {
+ printf("%s: %s\n", devname, err_msg);
+ }
+ if (errortag) {
+ goto done;
+ }
+ }
+ off += sizeof(pt) + len;
+ }
+
+breakbreak:;
+ switch (ph->code) {
+ case PPPOE_CODE_PADI:
+#ifdef PPPOE_SERVER
+ /*
+ * got service name, concentrator name, and/or host unique.
+ * ignore if we have no interfaces with IFF_PASSIVE|IFF_UP.
+ */
+ if (LIST_EMPTY(&pppoe_softc_list)) {
+ goto done;
+ }
+ LIST_FOREACH(sc, &pppoe_softc_list, sc_list) {
+ if (!(sc->sc_sppp.pp_if.if_flags & IFF_UP)) {
+ continue;
+ }
+ if (!(sc->sc_sppp.pp_if.if_flags & IFF_PASSIVE)) {
+ continue;
+ }
+ if (sc->sc_state == PPPOE_STATE_INITIAL) {
+ break;
+ }
+ }
+ if (sc == NULL) {
+ /* printf("pppoe: free passive interface is not found\n"); */
+ goto done;
+ }
+ if (hunique) {
+ if (sc->sc_hunique) {
+ mem_free(sc->sc_hunique);
+ }
+ sc->sc_hunique = mem_malloc(hunique_len);
+ if (sc->sc_hunique == NULL) {
+ goto done;
+ }
+ sc->sc_hunique_len = hunique_len;
+ MEMCPY(sc->sc_hunique, hunique, hunique_len);
+ }
+ MEMCPY(&sc->sc_dest, eh->ether_shost, sizeof sc->sc_dest);
+ sc->sc_state = PPPOE_STATE_PADO_SENT;
+ pppoe_send_pado(sc);
+ break;
+#endif /* PPPOE_SERVER */
+ case PPPOE_CODE_PADR:
+#ifdef PPPOE_SERVER
+ /*
+ * get sc from ac_cookie if IFF_PASSIVE
+ */
+ if (ac_cookie == NULL) {
+ /* be quiet if there is not a single pppoe instance */
+ printf("pppoe: received PADR but not includes ac_cookie\n");
+ goto done;
+ }
+ sc = pppoe_find_softc_by_hunique(ac_cookie, ac_cookie_len, netif);
+ if (sc == NULL) {
+ /* be quiet if there is not a single pppoe instance */
+ if (!LIST_EMPTY(&pppoe_softc_list)) {
+ printf("pppoe: received PADR but could not find request for it\n");
+ }
+ goto done;
+ }
+ if (sc->sc_state != PPPOE_STATE_PADO_SENT) {
+ printf("%c%c%"U16_F": received unexpected PADR\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num);
+ goto done;
+ }
+ if (hunique) {
+ if (sc->sc_hunique) {
+ mem_free(sc->sc_hunique);
+ }
+ sc->sc_hunique = mem_malloc(hunique_len);
+ if (sc->sc_hunique == NULL) {
+ goto done;
+ }
+ sc->sc_hunique_len = hunique_len;
+ MEMCPY(sc->sc_hunique, hunique, hunique_len);
+ }
+ pppoe_send_pads(sc);
+ sc->sc_state = PPPOE_STATE_SESSION;
+ pppoe_linkstatus_up(sc); /* notify upper layers */
+ break;
+#else
+ /* ignore, we are no access concentrator */
+ goto done;
+#endif /* PPPOE_SERVER */
+ case PPPOE_CODE_PADO:
+ if (sc == NULL) {
+ /* be quiet if there is not a single pppoe instance */
+ if (pppoe_softc_list != NULL) {
+ printf("pppoe: received PADO but could not find request for it\n");
+ }
+ goto done;
+ }
+ if (sc->sc_state != PPPOE_STATE_PADI_SENT) {
+ printf("%c%c%"U16_F": received unexpected PADO\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num);
+ goto done;
+ }
+ if (ac_cookie) {
+ sc->sc_ac_cookie_len = ac_cookie_len;
+ MEMCPY(sc->sc_ac_cookie, ac_cookie, ac_cookie_len);
+ }
+ MEMCPY(&sc->sc_dest, ethhdr->src.addr, sizeof(sc->sc_dest.addr));
+ sys_untimeout(pppoe_timeout, sc);
+ sc->sc_padr_retried = 0;
+ sc->sc_state = PPPOE_STATE_PADR_SENT;
+ if ((err = pppoe_send_padr(sc)) != 0) {
+ 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));
+ }
+ sys_timeout(PPPOE_DISC_TIMEOUT * (1 + sc->sc_padr_retried), pppoe_timeout, sc);
+ break;
+ case PPPOE_CODE_PADS:
+ if (sc == NULL) {
+ goto done;
+ }
+ sc->sc_session = session;
+ sys_untimeout(pppoe_timeout, sc);
+ 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));
+ sc->sc_state = PPPOE_STATE_SESSION;
+ pppoe_linkstatus_up(sc); /* notify upper layers */
+ break;
+ case PPPOE_CODE_PADT:
+ if (sc == NULL) {
+ goto done;
+ }
+ pppoe_clear_softc(sc, "received PADT");
+ break;
+ default:
+ if(sc) {
+ printf("%c%c%"U16_F": unknown code (0x%"X16_F") session = 0x%"X16_F"\n",
+ sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num,
+ (u16_t)ph->code, session);
+ } else {
+ printf("pppoe: unknown code (0x%"X16_F") session = 0x%"X16_F"\n", (u16_t)ph->code, session);
+ }
+ break;
+ }
+
+done:
+ pbuf_free(pb);
+ return;
+}
+
+void
+pppoe_disc_input(struct netif *netif, struct pbuf *p)
+{
+ /* avoid error messages if there is not a single pppoe instance */
+ if (pppoe_softc_list != NULL) {
+ pppoe_dispatch_disc_pkt(netif, p);
+ } else {
+ pbuf_free(p);
+ }
+}
+
+void
+pppoe_data_input(struct netif *netif, struct pbuf *pb)
+{
+ u16_t session, plen;
+ struct pppoe_softc *sc;
+ struct pppoehdr *ph;
+#ifdef PPPOE_TERM_UNKNOWN_SESSIONS
+ u8_t shost[ETHER_ADDR_LEN];
+#endif
+
+#ifdef PPPOE_TERM_UNKNOWN_SESSIONS
+ MEMCPY(shost, ((struct eth_hdr *)pb->payload)->src.addr, sizeof(shost));
+#endif
+ if (pbuf_header(pb, -(int)sizeof(struct eth_hdr)) != 0) {
+ /* bail out */
+ PPPDEBUG(LOG_ERR, ("pppoe_data_input: pbuf_header failed\n"));
+ LINK_STATS_INC(link.lenerr);
+ goto drop;
+ }
+
+ pb = pppSingleBuf (pb);
+
+ if (pb->len <= PPPOE_HEADERLEN) {
+ printf("pppoe (data): dropping too short packet: %d bytes\n", pb->len);
+ goto drop;
+ }
+
+ if (pb->len < sizeof(*ph)) {
+ printf("pppoe_data_input: could not get PPPoE header\n");
+ goto drop;
+ }
+ ph = (struct pppoehdr *)pb->payload;
+
+ if (ph->vertype != PPPOE_VERTYPE) {
+ printf("pppoe (data): unknown version/type packet: 0x%x\n", ph->vertype);
+ goto drop;
+ }
+ if (ph->code != 0) {
+ goto drop;
+ }
+
+ session = ntohs(ph->session);
+ sc = pppoe_find_softc_by_session(session, netif);
+ if (sc == NULL) {
+#ifdef PPPOE_TERM_UNKNOWN_SESSIONS
+ printf("pppoe: input for unknown session 0x%x, sending PADT\n", session);
+ pppoe_send_padt(netif, session, shost);
+#endif
+ goto drop;
+ }
+
+ plen = ntohs(ph->plen);
+
+ if (pbuf_header(pb, -(int)(PPPOE_HEADERLEN)) != 0) {
+ /* bail out */
+ PPPDEBUG(LOG_ERR, ("pppoe_data_input: pbuf_header PPPOE_HEADERLEN failed\n"));
+ LINK_STATS_INC(link.lenerr);
+ goto drop;
+ }
+
+ PPPDEBUG(LOG_DEBUG, ("pppoe_data_input: %c%c%"U16_F": pkthdr.len=%d, pppoe.len=%d\n",
+ sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num,
+ pb->len, plen));
+
+ if (pb->len < plen) {
+ goto drop;
+ }
+
+ pppInProcOverEthernet(sc->sc_pd, pb);
+
+ return;
+
+drop:
+ pbuf_free(pb);
+}
+
+static err_t
+pppoe_output(struct pppoe_softc *sc, struct pbuf *pb)
+{
+ struct eth_hdr *ethhdr;
+ u16_t etype;
+ err_t res;
+
+ if (!sc->sc_ethif) {
+ pbuf_free(pb);
+ return ERR_IF;
+ }
+
+ ethhdr = (struct eth_hdr *)pb->payload;
+ etype = sc->sc_state == PPPOE_STATE_SESSION ? ETHTYPE_PPPOE : ETHTYPE_PPPOEDISC;
+ ethhdr->type = htons(etype);
+ MEMCPY(ethhdr->dest.addr, sc->sc_dest.addr, sizeof(ethhdr->dest.addr));
+ MEMCPY(ethhdr->src.addr, ((struct eth_addr *)sc->sc_ethif->hwaddr)->addr, sizeof(ethhdr->src.addr));
+
+ 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",
+ sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num, etype,
+ sc->sc_state, sc->sc_session,
+ 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],
+ pb->tot_len));
+
+ res = sc->sc_ethif->linkoutput(sc->sc_ethif, pb);
+
+ pbuf_free(pb);
+
+ return res;
+}
+
+static err_t
+pppoe_send_padi(struct pppoe_softc *sc)
+{
+ struct pbuf *pb;
+ u8_t *p;
+ int len;
+#ifdef PPPOE_TODO
+ int l1 = 0, l2 = 0; /* XXX: gcc */
+#endif /* PPPOE_TODO */
+
+ if (sc->sc_state >PPPOE_STATE_PADI_SENT) {
+ PPPDEBUG(LOG_ERR, ("ERROR: pppoe_send_padi in state %d", sc->sc_state));
+ }
+
+ /* calculate length of frame (excluding ethernet header + pppoe header) */
+ len = 2 + 2 + 2 + 2 + sizeof sc; /* service name tag is required, host unique is send too */
+#ifdef PPPOE_TODO
+ if (sc->sc_service_name != NULL) {
+ l1 = (int)strlen(sc->sc_service_name);
+ len += l1;
+ }
+ if (sc->sc_concentrator_name != NULL) {
+ l2 = (int)strlen(sc->sc_concentrator_name);
+ len += 2 + 2 + l2;
+ }
+#endif /* PPPOE_TODO */
+ LWIP_ASSERT("sizeof(struct eth_hdr) + PPPOE_HEADERLEN + len <= 0xffff",
+ sizeof(struct eth_hdr) + PPPOE_HEADERLEN + len <= 0xffff);
+
+ /* allocate a buffer */
+ pb = pbuf_alloc(PBUF_LINK, (u16_t)(sizeof(struct eth_hdr) + PPPOE_HEADERLEN + len), PBUF_RAM);
+ if (!pb) {
+ return ERR_MEM;
+ }
+ LWIP_ASSERT("pb->tot_len == pb->len", pb->tot_len == pb->len);
+
+ p = (u8_t*)pb->payload + sizeof (struct eth_hdr);
+ /* fill in pkt */
+ PPPOE_ADD_HEADER(p, PPPOE_CODE_PADI, 0, (u16_t)len);
+ PPPOE_ADD_16(p, PPPOE_TAG_SNAME);
+#ifdef PPPOE_TODO
+ if (sc->sc_service_name != NULL) {
+ PPPOE_ADD_16(p, l1);
+ MEMCPY(p, sc->sc_service_name, l1);
+ p += l1;
+ } else
+#endif /* PPPOE_TODO */
+ {
+ PPPOE_ADD_16(p, 0);
+ }
+#ifdef PPPOE_TODO
+ if (sc->sc_concentrator_name != NULL) {
+ PPPOE_ADD_16(p, PPPOE_TAG_ACNAME);
+ PPPOE_ADD_16(p, l2);
+ MEMCPY(p, sc->sc_concentrator_name, l2);
+ p += l2;
+ }
+#endif /* PPPOE_TODO */
+ PPPOE_ADD_16(p, PPPOE_TAG_HUNIQUE);
+ PPPOE_ADD_16(p, sizeof(sc));
+ MEMCPY(p, &sc, sizeof sc);
+
+ /* send pkt */
+ return pppoe_output(sc, pb);
+}
+
+static void
+pppoe_timeout(void *arg)
+{
+ int retry_wait, err;
+ struct pppoe_softc *sc = (struct pppoe_softc*)arg;
+
+ PPPDEBUG(LOG_DEBUG, ("pppoe: %c%c%"U16_F": timeout\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num));
+
+ switch (sc->sc_state) {
+ case PPPOE_STATE_PADI_SENT:
+ /*
+ * We have two basic ways of retrying:
+ * - Quick retry mode: try a few times in short sequence
+ * - Slow retry mode: we already had a connection successfully
+ * established and will try infinitely (without user
+ * intervention)
+ * We only enter slow retry mode if IFF_LINK1 (aka autodial)
+ * is not set.
+ */
+
+ /* initialize for quick retry mode */
+ retry_wait = PPPOE_DISC_TIMEOUT * (1 + sc->sc_padi_retried);
+
+ sc->sc_padi_retried++;
+ if (sc->sc_padi_retried >= PPPOE_DISC_MAXPADI) {
+#if 0
+ if ((sc->sc_sppp.pp_if.if_flags & IFF_LINK1) == 0) {
+ /* slow retry mode */
+ retry_wait = PPPOE_SLOW_RETRY;
+ } else
+#endif
+ {
+ pppoe_abort_connect(sc);
+ return;
+ }
+ }
+ if ((err = pppoe_send_padi(sc)) != 0) {
+ sc->sc_padi_retried--;
+ 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));
+ }
+ sys_timeout(retry_wait, pppoe_timeout, sc);
+ break;
+
+ case PPPOE_STATE_PADR_SENT:
+ sc->sc_padr_retried++;
+ if (sc->sc_padr_retried >= PPPOE_DISC_MAXPADR) {
+ MEMCPY(&sc->sc_dest, ethbroadcast.addr, sizeof(sc->sc_dest));
+ sc->sc_state = PPPOE_STATE_PADI_SENT;
+ sc->sc_padr_retried = 0;
+ if ((err = pppoe_send_padi(sc)) != 0) {
+ 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));
+ }
+ sys_timeout(PPPOE_DISC_TIMEOUT * (1 + sc->sc_padi_retried), pppoe_timeout, sc);
+ return;
+ }
+ if ((err = pppoe_send_padr(sc)) != 0) {
+ sc->sc_padr_retried--;
+ 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));
+ }
+ sys_timeout(PPPOE_DISC_TIMEOUT * (1 + sc->sc_padr_retried), pppoe_timeout, sc);
+ break;
+ case PPPOE_STATE_CLOSING:
+ pppoe_do_disconnect(sc);
+ break;
+ default:
+ return; /* all done, work in peace */
+ }
+}
+
+/* Start a connection (i.e. initiate discovery phase) */
+int
+pppoe_connect(struct pppoe_softc *sc)
+{
+ int err;
+
+ if (sc->sc_state != PPPOE_STATE_INITIAL) {
+ return EBUSY;
+ }
+
+#ifdef PPPOE_SERVER
+ /* wait PADI if IFF_PASSIVE */
+ if ((sc->sc_sppp.pp_if.if_flags & IFF_PASSIVE)) {
+ return 0;
+ }
+#endif
+ /* save state, in case we fail to send PADI */
+ sc->sc_state = PPPOE_STATE_PADI_SENT;
+ sc->sc_padr_retried = 0;
+ err = pppoe_send_padi(sc);
+ 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));
+ sys_timeout(PPPOE_DISC_TIMEOUT, pppoe_timeout, sc);
+ return err;
+}
+
+/* disconnect */
+void
+pppoe_disconnect(struct pppoe_softc *sc)
+{
+ if (sc->sc_state < PPPOE_STATE_SESSION) {
+ return;
+ }
+ /*
+ * Do not call pppoe_disconnect here, the upper layer state
+ * machine gets confused by this. We must return from this
+ * function and defer disconnecting to the timeout handler.
+ */
+ sc->sc_state = PPPOE_STATE_CLOSING;
+ sys_timeout(20, pppoe_timeout, sc);
+}
+
+static int
+pppoe_do_disconnect(struct pppoe_softc *sc)
+{
+ int err;
+
+ if (sc->sc_state < PPPOE_STATE_SESSION) {
+ err = EBUSY;
+ } else {
+ PPPDEBUG(LOG_DEBUG, ("pppoe: %c%c%"U16_F": disconnecting\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num));
+ err = pppoe_send_padt(sc->sc_ethif, sc->sc_session, (const u8_t *)&sc->sc_dest);
+ }
+
+ /* cleanup softc */
+ sc->sc_state = PPPOE_STATE_INITIAL;
+ MEMCPY(&sc->sc_dest, ethbroadcast.addr, sizeof(sc->sc_dest));
+ sc->sc_ac_cookie_len = 0;
+#ifdef PPPOE_SERVER
+ if (sc->sc_hunique) {
+ mem_free(sc->sc_hunique);
+ sc->sc_hunique = NULL;
+ }
+ sc->sc_hunique_len = 0;
+#endif
+ sc->sc_session = 0;
+
+ sc->sc_linkStatusCB(sc->sc_pd, 0); /* notify upper layers */
+
+ return err;
+}
+
+/* Connection attempt aborted */
+static void
+pppoe_abort_connect(struct pppoe_softc *sc)
+{
+ printf("%c%c%"U16_F": could not establish connection\n", sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num);
+ sc->sc_state = PPPOE_STATE_CLOSING;
+
+ sc->sc_linkStatusCB(sc->sc_pd, 0); /* notify upper layers */
+
+ /* clear connection state */
+ MEMCPY(&sc->sc_dest, ethbroadcast.addr, sizeof(sc->sc_dest));
+ sc->sc_state = PPPOE_STATE_INITIAL;
+}
+
+/* Send a PADR packet */
+static err_t
+pppoe_send_padr(struct pppoe_softc *sc)
+{
+ struct pbuf *pb;
+ u8_t *p;
+ size_t len;
+#ifdef PPPOE_TODO
+ size_t l1 = 0; /* XXX: gcc */
+#endif /* PPPOE_TODO */
+
+ if (sc->sc_state != PPPOE_STATE_PADR_SENT) {
+ return ERR_CONN;
+ }
+
+ len = 2 + 2 + 2 + 2 + sizeof(sc); /* service name, host unique */
+#ifdef PPPOE_TODO
+ if (sc->sc_service_name != NULL) { /* service name tag maybe empty */
+ l1 = strlen(sc->sc_service_name);
+ len += l1;
+ }
+#endif /* PPPOE_TODO */
+ if (sc->sc_ac_cookie_len > 0) {
+ len += 2 + 2 + sc->sc_ac_cookie_len; /* AC cookie */
+ }
+ LWIP_ASSERT("sizeof(struct eth_hdr) + PPPOE_HEADERLEN + len <= 0xffff",
+ sizeof(struct eth_hdr) + PPPOE_HEADERLEN + len <= 0xffff);
+ pb = pbuf_alloc(PBUF_LINK, (u16_t)(sizeof(struct eth_hdr) + PPPOE_HEADERLEN + len), PBUF_RAM);
+ if (!pb) {
+ return ERR_MEM;
+ }
+ LWIP_ASSERT("pb->tot_len == pb->len", pb->tot_len == pb->len);
+ p = (u8_t*)pb->payload + sizeof (struct eth_hdr);
+ PPPOE_ADD_HEADER(p, PPPOE_CODE_PADR, 0, len);
+ PPPOE_ADD_16(p, PPPOE_TAG_SNAME);
+#ifdef PPPOE_TODO
+ if (sc->sc_service_name != NULL) {
+ PPPOE_ADD_16(p, l1);
+ MEMCPY(p, sc->sc_service_name, l1);
+ p += l1;
+ } else
+#endif /* PPPOE_TODO */
+ {
+ PPPOE_ADD_16(p, 0);
+ }
+ if (sc->sc_ac_cookie_len > 0) {
+ PPPOE_ADD_16(p, PPPOE_TAG_ACCOOKIE);
+ PPPOE_ADD_16(p, sc->sc_ac_cookie_len);
+ MEMCPY(p, sc->sc_ac_cookie, sc->sc_ac_cookie_len);
+ p += sc->sc_ac_cookie_len;
+ }
+ PPPOE_ADD_16(p, PPPOE_TAG_HUNIQUE);
+ PPPOE_ADD_16(p, sizeof(sc));
+ MEMCPY(p, &sc, sizeof sc);
+
+ return pppoe_output(sc, pb);
+}
+
+/* send a PADT packet */
+static err_t
+pppoe_send_padt(struct netif *outgoing_if, u_int session, const u8_t *dest)
+{
+ struct pbuf *pb;
+ struct eth_hdr *ethhdr;
+ err_t res;
+ u8_t *p;
+
+ pb = pbuf_alloc(PBUF_LINK, sizeof(struct eth_hdr) + PPPOE_HEADERLEN, PBUF_RAM);
+ if (!pb) {
+ return ERR_MEM;
+ }
+ LWIP_ASSERT("pb->tot_len == pb->len", pb->tot_len == pb->len);
+
+ ethhdr = (struct eth_hdr *)pb->payload;
+ ethhdr->type = PP_HTONS(ETHTYPE_PPPOEDISC);
+ MEMCPY(ethhdr->dest.addr, dest, sizeof(ethhdr->dest.addr));
+ MEMCPY(ethhdr->src.addr, ((struct eth_addr *)outgoing_if->hwaddr)->addr, sizeof(ethhdr->src.addr));
+
+ p = (u8_t*)(ethhdr + 1);
+ PPPOE_ADD_HEADER(p, PPPOE_CODE_PADT, session, 0);
+
+ res = outgoing_if->linkoutput(outgoing_if, pb);
+
+ pbuf_free(pb);
+
+ return res;
+}
+
+#ifdef PPPOE_SERVER
+static err_t
+pppoe_send_pado(struct pppoe_softc *sc)
+{
+ struct pbuf *pb;
+ u8_t *p;
+ size_t len;
+
+ if (sc->sc_state != PPPOE_STATE_PADO_SENT) {
+ return ERR_CONN;
+ }
+
+ /* calc length */
+ len = 0;
+ /* include ac_cookie */
+ len += 2 + 2 + sizeof(sc);
+ /* include hunique */
+ len += 2 + 2 + sc->sc_hunique_len;
+ pb = pbuf_alloc(PBUF_LINK, sizeof(struct eth_hdr) + PPPOE_HEADERLEN + len, PBUF_RAM);
+ if (!pb) {
+ return ERR_MEM;
+ }
+ LWIP_ASSERT("pb->tot_len == pb->len", pb->tot_len == pb->len);
+ p = (u8_t*)pb->payload + sizeof (struct eth_hdr);
+ PPPOE_ADD_HEADER(p, PPPOE_CODE_PADO, 0, len);
+ PPPOE_ADD_16(p, PPPOE_TAG_ACCOOKIE);
+ PPPOE_ADD_16(p, sizeof(sc));
+ MEMCPY(p, &sc, sizeof(sc));
+ p += sizeof(sc);
+ PPPOE_ADD_16(p, PPPOE_TAG_HUNIQUE);
+ PPPOE_ADD_16(p, sc->sc_hunique_len);
+ MEMCPY(p, sc->sc_hunique, sc->sc_hunique_len);
+ return pppoe_output(sc, pb);
+}
+
+static err_t
+pppoe_send_pads(struct pppoe_softc *sc)
+{
+ struct pbuf *pb;
+ u8_t *p;
+ size_t len, l1 = 0; /* XXX: gcc */
+
+ if (sc->sc_state != PPPOE_STATE_PADO_SENT) {
+ return ERR_CONN;
+ }
+
+ sc->sc_session = mono_time.tv_sec % 0xff + 1;
+ /* calc length */
+ len = 0;
+ /* include hunique */
+ len += 2 + 2 + 2 + 2 + sc->sc_hunique_len; /* service name, host unique*/
+ if (sc->sc_service_name != NULL) { /* service name tag maybe empty */
+ l1 = strlen(sc->sc_service_name);
+ len += l1;
+ }
+ pb = pbuf_alloc(PBUF_LINK, sizeof(struct eth_hdr) + PPPOE_HEADERLEN + len, PBUF_RAM);
+ if (!pb) {
+ return ERR_MEM;
+ }
+ LWIP_ASSERT("pb->tot_len == pb->len", pb->tot_len == pb->len);
+ p = (u8_t*)pb->payload + sizeof (struct eth_hdr);
+ PPPOE_ADD_HEADER(p, PPPOE_CODE_PADS, sc->sc_session, len);
+ PPPOE_ADD_16(p, PPPOE_TAG_SNAME);
+ if (sc->sc_service_name != NULL) {
+ PPPOE_ADD_16(p, l1);
+ MEMCPY(p, sc->sc_service_name, l1);
+ p += l1;
+ } else {
+ PPPOE_ADD_16(p, 0);
+ }
+ PPPOE_ADD_16(p, PPPOE_TAG_HUNIQUE);
+ PPPOE_ADD_16(p, sc->sc_hunique_len);
+ MEMCPY(p, sc->sc_hunique, sc->sc_hunique_len);
+ return pppoe_output(sc, pb);
+}
+#endif
+
+err_t
+pppoe_xmit(struct pppoe_softc *sc, struct pbuf *pb)
+{
+ u8_t *p;
+ size_t len;
+
+ /* are we ready to process data yet? */
+ if (sc->sc_state < PPPOE_STATE_SESSION) {
+ /*sppp_flush(&sc->sc_sppp.pp_if);*/
+ pbuf_free(pb);
+ return ERR_CONN;
+ }
+
+ len = pb->tot_len;
+
+ /* make room for Ethernet header - should not fail */
+ if (pbuf_header(pb, sizeof(struct eth_hdr) + PPPOE_HEADERLEN) != 0) {
+ /* bail out */
+ 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));
+ LINK_STATS_INC(link.lenerr);
+ pbuf_free(pb);
+ return ERR_BUF;
+ }
+
+ p = (u8_t*)pb->payload + sizeof(struct eth_hdr);
+ PPPOE_ADD_HEADER(p, 0, sc->sc_session, len);
+
+ return pppoe_output(sc, pb);
+}
+
+#if 0 /*def PFIL_HOOKS*/
+static int
+pppoe_ifattach_hook(void *arg, struct pbuf **mp, struct netif *ifp, int dir)
+{
+ struct pppoe_softc *sc;
+ int s;
+
+ if (mp != (struct pbuf **)PFIL_IFNET_DETACH) {
+ return 0;
+ }
+
+ LIST_FOREACH(sc, &pppoe_softc_list, sc_list) {
+ if (sc->sc_ethif != ifp) {
+ continue;
+ }
+ if (sc->sc_sppp.pp_if.if_flags & IFF_UP) {
+ sc->sc_sppp.pp_if.if_flags &= ~(IFF_UP|IFF_RUNNING);
+ printf("%c%c%"U16_F": ethernet interface detached, going down\n",
+ sc->sc_ethif->name[0], sc->sc_ethif->name[1], sc->sc_ethif->num);
+ }
+ sc->sc_ethif = NULL;
+ pppoe_clear_softc(sc, "ethernet interface detached");
+ }
+
+ return 0;
+}
+#endif
+
+static void
+pppoe_clear_softc(struct pppoe_softc *sc, const char *message)
+{
+ LWIP_UNUSED_ARG(message);
+
+ /* stop timer */
+ sys_untimeout(pppoe_timeout, sc);
+ 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));
+
+ /* fix our state */
+ sc->sc_state = PPPOE_STATE_INITIAL;
+
+ /* notify upper layers */
+ sc->sc_linkStatusCB(sc->sc_pd, 0);
+
+ /* clean up softc */
+ MEMCPY(&sc->sc_dest, ethbroadcast.addr, sizeof(sc->sc_dest));
+ sc->sc_ac_cookie_len = 0;
+ sc->sc_session = 0;
+}
+
+#endif /* PPPOE_SUPPORT */
+