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minix3/lib/liblwip/netif/ppp/ppp_oe.c

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/*****************************************************************************
* 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 */
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