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/* $NetBSD: if_pppoe.c,v 1.101 2013/09/13 21:09:40 martin Exp $ */

/*-
* Copyright (c) 2002, 2008 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.
*
* 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 <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: if_pppoe.c,v 1.101 2013/09/13 21:09:40 martin Exp $");

#include "pppoe.h"
#include "opt_pppoe.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/callout.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/proc.h>
#include <sys/ioctl.h>
#include <sys/kauth.h>
#include <sys/intr.h>
#include <sys/socketvar.h>

#include <net/if.h>
#include <net/if_types.h>
#include <net/if_ether.h>
#include <net/if_sppp.h>
#include <net/if_spppvar.h>
#include <net/if_pppoe.h>

#include <net/bpf.h>


#undef PPPOE_DEBUG /* XXX - remove this or make it an option */
/* #define PPPOE_DEBUG 1 */

struct pppoehdr {
uint8_t vertype;
uint8_t code;
uint16_t session;
uint16_t plen;
} __packed;

struct pppoetag {
uint16_t tag;
uint16_t len;
} __packed;

#define PPPOE_HEADERLEN sizeof(struct pppoehdr)
#define PPPOE_OVERHEAD (PPPOE_HEADERLEN + 2)
#define PPPOE_VERTYPE 0x11 /* VER=1, TYPE = 1 */

#define PPPOE_TAG_EOL 0x0000 /* end of list */
#define PPPOE_TAG_SNAME 0x0101 /* service name */
#define PPPOE_TAG_ACNAME 0x0102 /* access concentrator name */
#define PPPOE_TAG_HUNIQUE 0x0103 /* host unique */
#define PPPOE_TAG_ACCOOKIE 0x0104 /* AC cookie */
#define PPPOE_TAG_VENDOR 0x0105 /* vendor specific */
#define PPPOE_TAG_RELAYSID 0x0110 /* relay session id */
#define PPPOE_TAG_MAX_PAYLOAD 0x0120 /* max payload */
#define PPPOE_TAG_SNAME_ERR 0x0201 /* service name error */
#define PPPOE_TAG_ACSYS_ERR 0x0202 /* AC system error */
#define PPPOE_TAG_GENERIC_ERR 0x0203 /* generic error */

#define PPPOE_CODE_PADI 0x09 /* Active Discovery Initiation */
#define PPPOE_CODE_PADO 0x07 /* Active Discovery Offer */
#define PPPOE_CODE_PADR 0x19 /* Active Discovery Request */
#define PPPOE_CODE_PADS 0x65 /* Active Discovery Session confirmation */
#define PPPOE_CODE_PADT 0xA7 /* Active Discovery Terminate */

/* two byte PPP protocol discriminator, then IP data */
#define PPPOE_MAXMTU (ETHERMTU - PPPOE_OVERHEAD)

/* Add a 16 bit unsigned value to a buffer pointed to by PTR */
#define PPPOE_ADD_16(PTR, VAL) \
*(PTR)++ = (VAL) / 256; \
*(PTR)++ = (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 (hz*5) /* base for quick timeout calculation */
#define PPPOE_SLOW_RETRY (hz*60) /* persistent retry interval */
#define PPPOE_RECON_FAST (hz*15) /* first retry after auth failure */
#define PPPOE_RECON_IMMEDIATE (hz/10) /* "no delay" reconnect */
#define PPPOE_DISC_MAXPADI 4 /* retry PADI four times (quickly) */
#define PPPOE_DISC_MAXPADR 2 /* retry PADR twice */

#ifdef PPPOE_SERVER
/* from if_spppsubr.c */
#define IFF_PASSIVE IFF_LINK0 /* wait passively for connection */
#endif

struct pppoe_softc {
struct sppp sc_sppp; /* contains a struct ifnet as first element */
LIST_ENTRY(pppoe_softc) sc_list;
struct ifnet *sc_eth_if; /* ethernet interface we are using */

int sc_state; /* discovery phase or session connected */
struct ether_addr sc_dest; /* hardware address of concentrator */
uint16_t sc_session; /* PPPoE session id */

char *sc_service_name; /* if != NULL: requested name of service */
char *sc_concentrator_name; /* if != NULL: requested concentrator id */
uint8_t *sc_ac_cookie; /* content of AC cookie we must echo back */
size_t sc_ac_cookie_len; /* length of cookie data */
uint8_t *sc_relay_sid; /* content of relay SID we must echo back */
size_t sc_relay_sid_len; /* length of relay SID data */
#ifdef PPPOE_SERVER
uint8_t *sc_hunique; /* content of host unique we must echo back */
size_t sc_hunique_len; /* length of host unique */
#endif
callout_t sc_timeout; /* timeout while not in session state */
int sc_padi_retried; /* number of PADI retries already done */
int sc_padr_retried; /* number of PADR retries already done */
};

/* incoming traffic will be queued here */
struct ifqueue ppoediscinq = { .ifq_maxlen = IFQ_MAXLEN };
struct ifqueue ppoeinq = { .ifq_maxlen = IFQ_MAXLEN };

void *pppoe_softintr = NULL;
static void pppoe_softintr_handler(void *);

extern int sppp_ioctl(struct ifnet *, unsigned long, void *);

/* input routines */
static void pppoe_input(void);
static void pppoe_disc_input(struct mbuf *);
static void pppoe_dispatch_disc_pkt(struct mbuf *, int);
static void pppoe_data_input(struct mbuf *);

/* management routines */
void pppoeattach(int);
static int pppoe_connect(struct pppoe_softc *);
static int pppoe_disconnect(struct pppoe_softc *);
static void pppoe_abort_connect(struct pppoe_softc *);
static int pppoe_ioctl(struct ifnet *, unsigned long, void *);
static void pppoe_tls(struct sppp *);
static void pppoe_tlf(struct sppp *);
static void pppoe_start(struct ifnet *);
static void pppoe_clear_softc(struct pppoe_softc *, const char *);

/* internal timeout handling */
static void pppoe_timeout(void *);

/* sending actual protocol controll packets */
static int pppoe_send_padi(struct pppoe_softc *);
static int pppoe_send_padr(struct pppoe_softc *);
#ifdef PPPOE_SERVER
static int pppoe_send_pado(struct pppoe_softc *);
static int pppoe_send_pads(struct pppoe_softc *);
#endif
static int pppoe_send_padt(struct ifnet *, u_int, const uint8_t *);

/* raw output */
static int pppoe_output(struct pppoe_softc *, struct mbuf *);

/* internal helper functions */
static struct pppoe_softc * pppoe_find_softc_by_session(u_int, struct ifnet *);
static struct pppoe_softc * pppoe_find_softc_by_hunique(uint8_t *, size_t, struct ifnet *);
static struct mbuf *pppoe_get_mbuf(size_t len);

static int pppoe_ifattach_hook(void *, struct mbuf **, struct ifnet *, int);

static LIST_HEAD(pppoe_softc_head, pppoe_softc) pppoe_softc_list;

static int pppoe_clone_create(struct if_clone *, int);
static int pppoe_clone_destroy(struct ifnet *);

static struct if_clone pppoe_cloner =
    IF_CLONE_INITIALIZER("pppoe", pppoe_clone_create, pppoe_clone_destroy);

/* ARGSUSED */
void
pppoeattach(int count)
{
LIST_INIT(&pppoe_softc_list);
if_clone_attach(&pppoe_cloner);

pppoe_softintr = softint_establish(SOFTINT_NET, pppoe_softintr_handler, NULL);
}

static int
pppoe_clone_create(struct if_clone *ifc, int unit)
{
struct pppoe_softc *sc;

sc = malloc(sizeof(struct pppoe_softc), M_DEVBUF, M_WAITOK|M_ZERO);

if_initname(&sc->sc_sppp.pp_if, "pppoe", unit);
sc->sc_sppp.pp_if.if_softc = sc;
sc->sc_sppp.pp_if.if_mtu = PPPOE_MAXMTU;
sc->sc_sppp.pp_if.if_flags = IFF_SIMPLEX|IFF_POINTOPOINT|IFF_MULTICAST;
sc->sc_sppp.pp_if.if_type = IFT_PPP;
sc->sc_sppp.pp_if.if_hdrlen = sizeof(struct ether_header) + PPPOE_HEADERLEN;
sc->sc_sppp.pp_if.if_dlt = DLT_PPP_ETHER;
sc->sc_sppp.pp_flags |= PP_KEEPALIVE | /* use LCP keepalive */
PP_NOFRAMING; /* no serial encapsulation */
sc->sc_sppp.pp_if.if_ioctl = pppoe_ioctl;
IFQ_SET_MAXLEN(&sc->sc_sppp.pp_if.if_snd, IFQ_MAXLEN);
IFQ_SET_READY(&sc->sc_sppp.pp_if.if_snd);

/* changed to real address later */
memcpy(&sc->sc_dest, etherbroadcastaddr, sizeof(sc->sc_dest));

callout_init(&sc->sc_timeout, 0);

sc->sc_sppp.pp_if.if_start = pppoe_start;
sc->sc_sppp.pp_tls = pppoe_tls;
sc->sc_sppp.pp_tlf = pppoe_tlf;
sc->sc_sppp.pp_framebytes = PPPOE_HEADERLEN; /* framing added to ppp packets */

if_attach(&sc->sc_sppp.pp_if);
sppp_attach(&sc->sc_sppp.pp_if);

bpf_attach(&sc->sc_sppp.pp_if, DLT_PPP_ETHER, 0);
if (LIST_EMPTY(&pppoe_softc_list)) {
pfil_add_hook(pppoe_ifattach_hook, NULL, PFIL_IFNET, if_pfil);
}
LIST_INSERT_HEAD(&pppoe_softc_list, sc, sc_list);
return 0;
}

static int
pppoe_clone_destroy(struct ifnet *ifp)
{
struct pppoe_softc * sc = ifp->if_softc;

callout_stop(&sc->sc_timeout);
LIST_REMOVE(sc, sc_list);
if (LIST_EMPTY(&pppoe_softc_list)) {
pfil_remove_hook(pppoe_ifattach_hook, NULL, PFIL_IFNET, if_pfil);
}
bpf_detach(ifp);
sppp_detach(&sc->sc_sppp.pp_if);
if_detach(ifp);
if (sc->sc_concentrator_name)
free(sc->sc_concentrator_name, M_DEVBUF);
if (sc->sc_service_name)
free(sc->sc_service_name, M_DEVBUF);
if (sc->sc_ac_cookie)
free(sc->sc_ac_cookie, M_DEVBUF);
if (sc->sc_relay_sid)
free(sc->sc_relay_sid, M_DEVBUF);
callout_destroy(&sc->sc_timeout);
free(sc, M_DEVBUF);

return (0);
}

/*
* 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 ifnet *rcvif)
{
struct pppoe_softc *sc;

if (session == 0)
return NULL;

LIST_FOREACH(sc, &pppoe_softc_list, sc_list) {
if (sc->sc_state == PPPOE_STATE_SESSION
&& sc->sc_session == session
&& sc->sc_eth_if == rcvif)
return sc;
}
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(uint8_t *token, size_t len, struct ifnet *rcvif)
{
struct pppoe_softc *sc, *t;

if (LIST_EMPTY(&pppoe_softc_list))
return NULL;

if (len != sizeof sc)
return NULL;
memcpy(&t, token, len);

LIST_FOREACH(sc, &pppoe_softc_list, sc_list)
if (sc == t) break;

if (sc == NULL) {
#ifdef PPPOE_DEBUG
printf("pppoe: alien host unique tag, no session found\n");
#endif
return NULL;
}

/* should be safe to access *sc now */
if (sc->sc_state < PPPOE_STATE_PADI_SENT || sc->sc_state >= PPPOE_STATE_SESSION) {
printf("%s: host unique tag found, but it belongs to a connection in state %d\n",
sc->sc_sppp.pp_if.if_xname, sc->sc_state);
return NULL;
}
if (sc->sc_eth_if != rcvif) {
printf("%s: wrong interface, not accepting host unique\n",
sc->sc_sppp.pp_if.if_xname);
return NULL;
}
return sc;
}

static void
pppoe_softintr_handler(void *dummy)
{
/* called at splsoftnet() */
mutex_enter(softnet_lock);
pppoe_input();
mutex_exit(softnet_lock);
}

/* called at appropriate protection level */
static void
pppoe_input(void)
{
struct mbuf *m;
int s, disc_done, data_done;

do {
disc_done = 0;
data_done = 0;
for (;;) {
s = splnet();
IF_DEQUEUE(&ppoediscinq, m);
splx(s);
if (m == NULL) break;
disc_done = 1;
pppoe_disc_input(m);
}

for (;;) {
s = splnet();
IF_DEQUEUE(&ppoeinq, m);
splx(s);
if (m == NULL) break;
data_done = 1;
pppoe_data_input(m);
}
} while (disc_done || data_done);
}

/* analyze and handle a single received packet while not in session state */
static void
pppoe_dispatch_disc_pkt(struct mbuf *m, int off)
{
uint16_t tag, len;
uint16_t session, plen;
struct pppoe_softc *sc;
const char *err_msg, *devname;
char *error;
uint8_t *ac_cookie;
size_t ac_cookie_len;
uint8_t *relay_sid;
size_t relay_sid_len;
#ifdef PPPOE_SERVER
uint8_t *hunique;
size_t hunique_len;
#endif
struct pppoehdr *ph;
struct pppoetag *pt;
struct mbuf *n;
int noff, err, errortag;
struct ether_header *eh;

devname = "pppoe"; /* as long as we don't know which instance */
err_msg = NULL;
errortag = 0;
if (m->m_len < sizeof(*eh)) {
m = m_pullup(m, sizeof(*eh));
if (!m)
goto done;
}
eh = mtod(m, struct ether_header *);
off += sizeof(*eh);

ac_cookie = NULL;
ac_cookie_len = 0;
relay_sid = NULL;
relay_sid_len = 0;
#ifdef PPPOE_SERVER
hunique = NULL;
hunique_len = 0;
#endif
session = 0;
if (m->m_pkthdr.len - off <= PPPOE_HEADERLEN) {
printf("pppoe: packet too short: %d\n", m->m_pkthdr.len);
goto done;
}

n = m_pulldown(m, off, sizeof(*ph), &noff);
if (!n) {
printf("pppoe: could not get PPPoE header\n");
m = NULL;
goto done;
}
ph = (struct pppoehdr *)(mtod(n, char *) + noff);
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 > m->m_pkthdr.len) {
printf("pppoe: packet content does not fit: data available = %d, packet size = %u\n",
m->m_pkthdr.len - off, plen);
goto done;
}
m_adj(m, off + plen - m->m_pkthdr.len); /* ignore trailing garbage */
tag = 0;
len = 0;
sc = NULL;
while (off + sizeof(*pt) <= m->m_pkthdr.len) {
n = m_pulldown(m, off, sizeof(*pt), &noff);
if (!n) {
printf("%s: parse error\n", devname);
m = NULL;
goto done;
}
pt = (struct pppoetag *)(mtod(n, char *) + noff);
tag = ntohs(pt->tag);
len = ntohs(pt->len);
if (off + len + sizeof(*pt) > m->m_pkthdr.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:
error = NULL;
if (sc != NULL && len > 0) {
error = malloc(len+1, M_TEMP, M_NOWAIT);
if (error) {
n = m_pulldown(m, off + sizeof(*pt),
len, &noff);
if (n) {
strncpy(error,
mtod(n, char*) + noff,
len);
error[len] = '\0';
}
printf("%s: connected to %s\n",
devname, error);
free(error, M_TEMP);
}
}
break; /* ignored */
case PPPOE_TAG_HUNIQUE:
if (sc != NULL)
break;
n = m_pulldown(m, off + sizeof(*pt), len, &noff);
if (!n) {
m = NULL;
err_msg = "TAG HUNIQUE ERROR";
break;
}
#ifdef PPPOE_SERVER
hunique = mtod(n, uint8_t *) + noff;
hunique_len = len;
#endif
sc = pppoe_find_softc_by_hunique(mtod(n, char *) + noff,
len, m->m_pkthdr.rcvif);
if (sc != NULL)
devname = sc->sc_sppp.pp_if.if_xname;
break;
case PPPOE_TAG_ACCOOKIE:
if (ac_cookie == NULL) {
n = m_pulldown(m, off + sizeof(*pt), len,
&noff);
if (!n) {
err_msg = "TAG ACCOOKIE ERROR";
m = NULL;
break;
}
ac_cookie = mtod(n, char *) + noff;
ac_cookie_len = len;
}
break;
case PPPOE_TAG_RELAYSID:
if (relay_sid == NULL) {
n = m_pulldown(m, off + sizeof(*pt), len,
&noff);
if (!n) {
err_msg = "TAG RELAYSID ERROR";
m = NULL;
break;
}
relay_sid = mtod(n, char *) + noff;
relay_sid_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) {
error = NULL;
if (errortag && len) {
error = malloc(len+1, M_TEMP, M_NOWAIT);
n = m_pulldown(m, off + sizeof(*pt), len,
&noff);
if (n && error) {
strncpy(error,
mtod(n, char *) + noff, len);
error[len] = '\0';
}
}
if (error) {
printf("%s: %s: %s\n", devname,
err_msg, error);
free(error, M_TEMP);
} else
printf("%s: %s\n", devname, err_msg);
if (errortag || m == NULL)
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)
free(sc->sc_hunique, M_DEVBUF);
sc->sc_hunique = malloc(hunique_len, M_DEVBUF,
M_DONTWAIT);
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,
m->m_pkthdr.rcvif);
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("%s: received unexpected PADR\n",
sc->sc_sppp.pp_if.if_xname);
goto done;
}
if (hunique) {
if (sc->sc_hunique)
free(sc->sc_hunique, M_DEVBUF);
sc->sc_hunique = malloc(hunique_len, M_DEVBUF,
M_DONTWAIT);
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;
sc->sc_sppp.pp_up(&sc->sc_sppp);
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 (!LIST_EMPTY(&pppoe_softc_list))
printf("pppoe: received PADO but could not find request for it\n");
goto done;
}
if (sc->sc_state != PPPOE_STATE_PADI_SENT) {
printf("%s: received unexpected PADO\n",
sc->sc_sppp.pp_if.if_xname);
goto done;
}
if (ac_cookie) {
if (sc->sc_ac_cookie)
free(sc->sc_ac_cookie, M_DEVBUF);
sc->sc_ac_cookie = malloc(ac_cookie_len, M_DEVBUF,
M_DONTWAIT);
if (sc->sc_ac_cookie == NULL) {
printf("%s: FATAL: could not allocate memory "
"for AC cookie\n",
sc->sc_sppp.pp_if.if_xname);
goto done;
}
sc->sc_ac_cookie_len = ac_cookie_len;
memcpy(sc->sc_ac_cookie, ac_cookie, ac_cookie_len);
}
if (relay_sid) {
if (sc->sc_relay_sid)
free(sc->sc_relay_sid, M_DEVBUF);
sc->sc_relay_sid = malloc(relay_sid_len, M_DEVBUF,
M_DONTWAIT);
if (sc->sc_relay_sid == NULL) {
printf("%s: FATAL: could not allocate memory "
"for relay SID\n",
sc->sc_sppp.pp_if.if_xname);
goto done;
}
sc->sc_relay_sid_len = relay_sid_len;
memcpy(sc->sc_relay_sid, relay_sid, relay_sid_len);
}
memcpy(&sc->sc_dest, eh->ether_shost, sizeof sc->sc_dest);
callout_stop(&sc->sc_timeout);
sc->sc_padr_retried = 0;
sc->sc_state = PPPOE_STATE_PADR_SENT;
if ((err = pppoe_send_padr(sc)) != 0) {
if (sc->sc_sppp.pp_if.if_flags & IFF_DEBUG)
printf("%s: failed to send PADR, "
"error=%d\n", sc->sc_sppp.pp_if.if_xname,
err);
}
callout_reset(&sc->sc_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;
callout_stop(&sc->sc_timeout);
if (sc->sc_sppp.pp_if.if_flags & IFF_DEBUG)
printf("%s: session 0x%x connected\n",
sc->sc_sppp.pp_if.if_xname, session);
sc->sc_state = PPPOE_STATE_SESSION;
sc->sc_sppp.pp_up(&sc->sc_sppp); /* notify upper layers */
break;
case PPPOE_CODE_PADT:
sc = pppoe_find_softc_by_session(session, m->m_pkthdr.rcvif);
if (sc == NULL)
goto done;
pppoe_clear_softc(sc, "received PADT");
break;
default:
printf("%s: unknown code (0x%04x) session = 0x%04x\n",
sc? sc->sc_sppp.pp_if.if_xname : "pppoe",
ph->code, session);
break;
}

done:
if (m)
m_freem(m);
return;
}

static void
pppoe_disc_input(struct mbuf *m)
{

/* avoid error messages if there is not a single pppoe instance */
if (!LIST_EMPTY(&pppoe_softc_list)) {
KASSERT(m->m_flags & M_PKTHDR);
pppoe_dispatch_disc_pkt(m, 0);
} else
m_freem(m);
}

static void
pppoe_data_input(struct mbuf *m)
{
uint16_t session, plen;
struct pppoe_softc *sc;
struct pppoehdr *ph;
#ifdef PPPOE_TERM_UNKNOWN_SESSIONS
uint8_t shost[ETHER_ADDR_LEN];
#endif

KASSERT(m->m_flags & M_PKTHDR);

#ifdef PPPOE_TERM_UNKNOWN_SESSIONS
memcpy(shost, mtod(m, struct ether_header*)->ether_shost, ETHER_ADDR_LEN);
#endif
m_adj(m, sizeof(struct ether_header));
if (m->m_pkthdr.len <= PPPOE_HEADERLEN) {
printf("pppoe (data): dropping too short packet: %d bytes\n",
m->m_pkthdr.len);
goto drop;
}

if (m->m_len < sizeof(*ph)) {
m = m_pullup(m, sizeof(*ph));
if (!m) {
printf("pppoe: could not get PPPoE header\n");
return;
}
}
ph = mtod(m, struct pppoehdr *);

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, m->m_pkthdr.rcvif);
if (sc == NULL) {
#ifdef PPPOE_TERM_UNKNOWN_SESSIONS
printf("pppoe: input for unknown session 0x%x, sending PADT\n",
session);
pppoe_send_padt(m->m_pkthdr.rcvif, session, shost);
#endif
goto drop;
}

plen = ntohs(ph->plen);

bpf_mtap(&sc->sc_sppp.pp_if, m);

m_adj(m, PPPOE_HEADERLEN);

#ifdef PPPOE_DEBUG
{
struct mbuf *p;

printf("%s: pkthdr.len=%d, pppoe.len=%d",
sc->sc_sppp.pp_if.if_xname,
m->m_pkthdr.len, plen);
p = m;
while (p) {
printf(" l=%d", p->m_len);
p = p->m_next;
}
printf("\n");
}
#endif

if (m->m_pkthdr.len < plen)
goto drop;

/* fix incoming interface pointer (not the raw ethernet interface anymore) */
m->m_pkthdr.rcvif = &sc->sc_sppp.pp_if;

/* pass packet up and account for it */
sc->sc_sppp.pp_if.if_ipackets++;
sppp_input(&sc->sc_sppp.pp_if, m);
return;

drop:
m_freem(m);
}

static int
pppoe_output(struct pppoe_softc *sc, struct mbuf *m)
{
struct sockaddr dst;
struct ether_header *eh;
uint16_t etype;

if (sc->sc_eth_if == NULL) {
m_freem(m);
return EIO;
}

memset(&dst, 0, sizeof dst);
dst.sa_family = AF_UNSPEC;
eh = (struct ether_header*)&dst.sa_data;
etype = sc->sc_state == PPPOE_STATE_SESSION ? ETHERTYPE_PPPOE : ETHERTYPE_PPPOEDISC;
eh->ether_type = htons(etype);
memcpy(&eh->ether_dhost, &sc->sc_dest, sizeof sc->sc_dest);

#ifdef PPPOE_DEBUG
printf("%s (%x) state=%d, session=0x%x output -> %s, len=%d\n",
sc->sc_sppp.pp_if.if_xname, etype,
sc->sc_state, sc->sc_session,
ether_sprintf((const unsigned char *)&sc->sc_dest), m->m_pkthdr.len);
#endif

m->m_flags &= ~(M_BCAST|M_MCAST);
sc->sc_sppp.pp_if.if_opackets++;
return sc->sc_eth_if->if_output(sc->sc_eth_if, m, &dst, NULL);
}

static int
pppoe_ioctl(struct ifnet *ifp, unsigned long cmd, void *data)
{
struct lwp *l = curlwp; /* XXX */
struct pppoe_softc *sc = (struct pppoe_softc*)ifp;
struct ifreq *ifr = data;
int error = 0;

switch (cmd) {
case PPPOESETPARMS:
{
struct pppoediscparms *parms = (struct pppoediscparms*)data;
if (kauth_authorize_network(l->l_cred, KAUTH_NETWORK_INTERFACE,
KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, ifp, (void *)cmd,
NULL) != 0)
return (EPERM);
if (parms->eth_ifname[0] != 0) {
struct ifnet *eth_if;

eth_if = ifunit(parms->eth_ifname);
if (eth_if == NULL || eth_if->if_dlt != DLT_EN10MB) {
sc->sc_eth_if = NULL;
return ENXIO;
}

if (sc->sc_sppp.pp_if.if_mtu !=
eth_if->if_mtu - PPPOE_OVERHEAD) {
sc->sc_sppp.pp_if.if_mtu = eth_if->if_mtu -
PPPOE_OVERHEAD;
}
sc->sc_eth_if = eth_if;
}
if (parms->ac_name != NULL) {
size_t s;
char *b = malloc(parms->ac_name_len + 1, M_DEVBUF,
M_WAITOK);
if (b == NULL)
return ENOMEM;
error = copyinstr(parms->ac_name, b,
parms->ac_name_len+1, &s);
if (error != 0) {
free(b, M_DEVBUF);
return error;
}
if (s != parms->ac_name_len+1) {
free(b, M_DEVBUF);
return EINVAL;
}
if (sc->sc_concentrator_name)
free(sc->sc_concentrator_name, M_DEVBUF);
sc->sc_concentrator_name = b;
}
if (parms->service_name != NULL) {
size_t s;
char *b = malloc(parms->service_name_len + 1, M_DEVBUF,
M_WAITOK);
if (b == NULL)
return ENOMEM;
error = copyinstr(parms->service_name, b,
parms->service_name_len+1, &s);
if (error != 0) {
free(b, M_DEVBUF);
return error;
}
if (s != parms->service_name_len+1) {
free(b, M_DEVBUF);
return EINVAL;
}
if (sc->sc_service_name)
free(sc->sc_service_name, M_DEVBUF);
sc->sc_service_name = b;
}
return 0;
}
break;
case PPPOEGETPARMS:
{
struct pppoediscparms *parms = (struct pppoediscparms*)data;
memset(parms, 0, sizeof *parms);
if (sc->sc_eth_if)
strncpy(parms->ifname, sc->sc_eth_if->if_xname, IFNAMSIZ);
return 0;
}
break;
case PPPOEGETSESSION:
{
struct pppoeconnectionstate *state = (struct pppoeconnectionstate*)data;
state->state = sc->sc_state;
state->session_id = sc->sc_session;
state->padi_retry_no = sc->sc_padi_retried;
state->padr_retry_no = sc->sc_padr_retried;
return 0;
}
break;
case SIOCSIFFLAGS:
/*
* Prevent running re-establishment timers overriding
* administrators choice.
*/
if ((ifr->ifr_flags & IFF_UP) == 0
&& sc->sc_state >= PPPOE_STATE_PADI_SENT
&& sc->sc_state < PPPOE_STATE_SESSION) {
callout_stop(&sc->sc_timeout);
sc->sc_state = PPPOE_STATE_INITIAL;
sc->sc_padi_retried = 0;
sc->sc_padr_retried = 0;
memcpy(&sc->sc_dest, etherbroadcastaddr,
sizeof(sc->sc_dest));
}
return sppp_ioctl(ifp, cmd, data);
case SIOCSIFMTU:
if (ifr->ifr_mtu > (sc->sc_eth_if == NULL ?
PPPOE_MAXMTU : (sc->sc_eth_if->if_mtu - PPPOE_OVERHEAD))) {
return EINVAL;
}
/*FALLTHROUGH*/
default:
return sppp_ioctl(ifp, cmd, data);
}
return 0;
}

/*
* Allocate a mbuf/cluster with space to store the given data length
* of payload, leaving space for prepending an ethernet header
* in front.
*/
static struct mbuf *
pppoe_get_mbuf(size_t len)
{
struct mbuf *m;

MGETHDR(m, M_DONTWAIT, MT_DATA);
if (m == NULL)
return NULL;
if (len + sizeof(struct ether_header) > MHLEN) {
MCLGET(m, M_DONTWAIT);
if ((m->m_flags & M_EXT) == 0) {
m_free(m);
return NULL;
}
}
m->m_data += sizeof(struct ether_header);
m->m_len = len;
m->m_pkthdr.len = len;
m->m_pkthdr.rcvif = NULL;

return m;
}

static int
pppoe_send_padi(struct pppoe_softc *sc)
{
struct mbuf *m0;
int len, l1 = 0, l2 = 0; /* XXX: gcc */
uint8_t *p;

if (sc->sc_state >PPPOE_STATE_PADI_SENT)
panic("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 */
if (sc->sc_service_name != NULL) {
l1 = strlen(sc->sc_service_name);
len += l1;
}
if (sc->sc_concentrator_name != NULL) {
l2 = strlen(sc->sc_concentrator_name);
len += 2 + 2 + l2;
}
if (sc->sc_sppp.pp_if.if_mtu > PPPOE_MAXMTU) {
len += 2 + 2 + 2;
}

/* allocate a buffer */
m0 = pppoe_get_mbuf(len + PPPOE_HEADERLEN); /* header len + payload len */
if (!m0)
return ENOBUFS;

/* fill in pkt */
p = mtod(m0, uint8_t *);
PPPOE_ADD_HEADER(p, PPPOE_CODE_PADI, 0, 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);
}
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;
}
PPPOE_ADD_16(p, PPPOE_TAG_HUNIQUE);
PPPOE_ADD_16(p, sizeof(sc));
memcpy(p, &sc, sizeof sc);
p += sizeof(sc);

if (sc->sc_sppp.pp_if.if_mtu > PPPOE_MAXMTU) {
PPPOE_ADD_16(p, PPPOE_TAG_MAX_PAYLOAD);
PPPOE_ADD_16(p, 2);
PPPOE_ADD_16(p, (uint16_t)sc->sc_sppp.pp_if.if_mtu);
}

#ifdef PPPOE_DEBUG
p += sizeof sc;
if (p - mtod(m0, uint8_t *) != len + PPPOE_HEADERLEN)
panic("pppoe_send_padi: garbled output len, should be %ld, is %ld",
(long)(len + PPPOE_HEADERLEN), (long)(p - mtod(m0, uint8_t *)));
#endif

/* send pkt */
return pppoe_output(sc, m0);
}

static void
pppoe_timeout(void *arg)
{
int x, retry_wait, err;
struct pppoe_softc *sc = (struct pppoe_softc*)arg;

#ifdef PPPOE_DEBUG
printf("%s: timeout\n", sc->sc_sppp.pp_if.if_xname);
#endif

switch (sc->sc_state) {
case PPPOE_STATE_INITIAL:
/* delayed connect from pppoe_tls() */
pppoe_connect(sc);
break;
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);

x = splnet();
sc->sc_padi_retried++;
if (sc->sc_padi_retried >= PPPOE_DISC_MAXPADI) {
if ((sc->sc_sppp.pp_if.if_flags & IFF_LINK1) == 0) {
/* slow retry mode */
retry_wait = PPPOE_SLOW_RETRY;
} else {
pppoe_abort_connect(sc);
splx(x);
return;
}
}
if ((err = pppoe_send_padi(sc)) != 0) {
sc->sc_padi_retried--;
if (sc->sc_sppp.pp_if.if_flags & IFF_DEBUG)
printf("%s: failed to transmit PADI, "
"error=%d\n",
sc->sc_sppp.pp_if.if_xname, err);
}
callout_reset(&sc->sc_timeout, retry_wait,
pppoe_timeout, sc);
splx(x);
break;

case PPPOE_STATE_PADR_SENT:
x = splnet();
sc->sc_padr_retried++;
if (sc->sc_padr_retried >= PPPOE_DISC_MAXPADR) {
memcpy(&sc->sc_dest, etherbroadcastaddr,
sizeof(sc->sc_dest));
sc->sc_state = PPPOE_STATE_PADI_SENT;
sc->sc_padr_retried = 0;
if ((err = pppoe_send_padi(sc)) != 0) {
if (sc->sc_sppp.pp_if.if_flags & IFF_DEBUG)
printf("%s: failed to send PADI"
", error=%d\n",
sc->sc_sppp.pp_if.if_xname,
err);
}
callout_reset(&sc->sc_timeout,
PPPOE_DISC_TIMEOUT * (1 + sc->sc_padi_retried),
pppoe_timeout, sc);
splx(x);
return;
}
if ((err = pppoe_send_padr(sc)) != 0) {
sc->sc_padr_retried--;
if (sc->sc_sppp.pp_if.if_flags & IFF_DEBUG)
printf("%s: failed to send PADR, "
"error=%d\n", sc->sc_sppp.pp_if.if_xname,
err);
}
callout_reset(&sc->sc_timeout,
PPPOE_DISC_TIMEOUT * (1 + sc->sc_padr_retried),
pppoe_timeout, sc);
splx(x);
break;
case PPPOE_STATE_CLOSING:
pppoe_disconnect(sc);
break;
default:
return; /* all done, work in peace */
}
}

/* Start a connection (i.e. initiate discovery phase) */
static int
pppoe_connect(struct pppoe_softc *sc)
{
int x, 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
x = splnet();
/* 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);
if (err != 0 && sc->sc_sppp.pp_if.if_flags & IFF_DEBUG)
printf("%s: failed to send PADI, error=%d\n",
sc->sc_sppp.pp_if.if_xname, err);
callout_reset(&sc->sc_timeout, PPPOE_DISC_TIMEOUT, pppoe_timeout, sc);
splx(x);
return err;
}

/* disconnect */
static int
pppoe_disconnect(struct pppoe_softc *sc)
{
int err, x;

x = splnet();

if (sc->sc_state < PPPOE_STATE_SESSION)
err = EBUSY;
else {
if (sc->sc_sppp.pp_if.if_flags & IFF_DEBUG)
printf("%s: disconnecting\n",
sc->sc_sppp.pp_if.if_xname);
err = pppoe_send_padt(sc->sc_eth_if, sc->sc_session, (const uint8_t *)&sc->sc_dest);
}

/* cleanup softc */
sc->sc_state = PPPOE_STATE_INITIAL;
memcpy(&sc->sc_dest, etherbroadcastaddr, sizeof(sc->sc_dest));
if (sc->sc_ac_cookie) {
free(sc->sc_ac_cookie, M_DEVBUF);
sc->sc_ac_cookie = NULL;
}
sc->sc_ac_cookie_len = 0;
if (sc->sc_relay_sid) {
free(sc->sc_relay_sid, M_DEVBUF);
sc->sc_relay_sid = NULL;
}
sc->sc_relay_sid_len = 0;
#ifdef PPPOE_SERVER
if (sc->sc_hunique) {
free(sc->sc_hunique, M_DEVBUF);
sc->sc_hunique = NULL;
}
sc->sc_hunique_len = 0;
#endif
sc->sc_session = 0;

/* notify upper layer */
sc->sc_sppp.pp_down(&sc->sc_sppp);

splx(x);

return err;
}

/* Connection attempt aborted */
static void
pppoe_abort_connect(struct pppoe_softc *sc)
{
printf("%s: could not establish connection\n",
sc->sc_sppp.pp_if.if_xname);
sc->sc_state = PPPOE_STATE_CLOSING;

/* notify upper layer */
sc->sc_sppp.pp_down(&sc->sc_sppp);

/* clear connection state */
memcpy(&sc->sc_dest, etherbroadcastaddr, sizeof(sc->sc_dest));
sc->sc_state = PPPOE_STATE_INITIAL;
}

/* Send a PADR packet */
static int
pppoe_send_padr(struct pppoe_softc *sc)
{
struct mbuf *m0;
uint8_t *p;
size_t len, l1 = 0; /* XXX: gcc */

if (sc->sc_state != PPPOE_STATE_PADR_SENT)
return EIO;

len = 2 + 2 + 2 + 2 + sizeof(sc); /* service name, host unique */
if (sc->sc_service_name != NULL) { /* service name tag maybe empty */
l1 = strlen(sc->sc_service_name);
len += l1;
}
if (sc->sc_ac_cookie_len > 0)
len += 2 + 2 + sc->sc_ac_cookie_len; /* AC cookie */
if (sc->sc_relay_sid_len > 0)
len += 2 + 2 + sc->sc_relay_sid_len; /* Relay SID */
if (sc->sc_sppp.pp_if.if_mtu > PPPOE_MAXMTU) {
len += 2 + 2 + 2;
}
m0 = pppoe_get_mbuf(len + PPPOE_HEADERLEN);
if (!m0)
return ENOBUFS;
p = mtod(m0, uint8_t *);
PPPOE_ADD_HEADER(p, PPPOE_CODE_PADR, 0, 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);
}
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;
}
if (sc->sc_relay_sid_len > 0) {
PPPOE_ADD_16(p, PPPOE_TAG_RELAYSID);
PPPOE_ADD_16(p, sc->sc_relay_sid_len);
memcpy(p, sc->sc_relay_sid, sc->sc_relay_sid_len);
p += sc->sc_relay_sid_len;
}
PPPOE_ADD_16(p, PPPOE_TAG_HUNIQUE);
PPPOE_ADD_16(p, sizeof(sc));
memcpy(p, &sc, sizeof sc);
p += sizeof(sc);

if (sc->sc_sppp.pp_if.if_mtu > PPPOE_MAXMTU) {
PPPOE_ADD_16(p, PPPOE_TAG_MAX_PAYLOAD);
PPPOE_ADD_16(p, 2);
PPPOE_ADD_16(p, (uint16_t)sc->sc_sppp.pp_if.if_mtu);
}

#ifdef PPPOE_DEBUG
p += sizeof sc;
if (p - mtod(m0, uint8_t *) != len + PPPOE_HEADERLEN)
panic("pppoe_send_padr: garbled output len, should be %ld, is %ld",
(long)(len + PPPOE_HEADERLEN), (long)(p - mtod(m0, uint8_t *)));
#endif

return pppoe_output(sc, m0);
}

/* send a PADT packet */
static int
pppoe_send_padt(struct ifnet *outgoing_if, u_int session, const uint8_t *dest)
{
struct ether_header *eh;
struct sockaddr dst;
struct mbuf *m0;
uint8_t *p;

m0 = pppoe_get_mbuf(PPPOE_HEADERLEN);
if (!m0)
return EIO;
p = mtod(m0, uint8_t *);
PPPOE_ADD_HEADER(p, PPPOE_CODE_PADT, session, 0);

memset(&dst, 0, sizeof dst);
dst.sa_family = AF_UNSPEC;
eh = (struct ether_header*)&dst.sa_data;
eh->ether_type = htons(ETHERTYPE_PPPOEDISC);
memcpy(&eh->ether_dhost, dest, ETHER_ADDR_LEN);

m0->m_flags &= ~(M_BCAST|M_MCAST);
return outgoing_if->if_output(outgoing_if, m0, &dst, NULL);
}

#ifdef PPPOE_SERVER
static int
pppoe_send_pado(struct pppoe_softc *sc)
{
struct mbuf *m0;
uint8_t *p;
size_t len;

if (sc->sc_state != PPPOE_STATE_PADO_SENT)
return EIO;

/* calc length */
len = 0;
/* include ac_cookie */
len += 2 + 2 + sizeof(sc);
/* include hunique */
len += 2 + 2 + sc->sc_hunique_len;
m0 = pppoe_get_mbuf(len + PPPOE_HEADERLEN);
if (!m0)
return EIO;
p = mtod(m0, uint8_t *);
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, m0);
}

static int
pppoe_send_pads(struct pppoe_softc *sc)
{
struct bintime bt;
struct mbuf *m0;
uint8_t *p;
size_t len, l1 = 0; /* XXX: gcc */

if (sc->sc_state != PPPOE_STATE_PADO_SENT)
return EIO;

getbinuptime(&bt);
sc->sc_session = bt.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;
}
m0 = pppoe_get_mbuf(len + PPPOE_HEADERLEN);
if (!m0)
return ENOBUFS;
p = mtod(m0, uint8_t *);
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, m0);
}
#endif

static void
pppoe_tls(struct sppp *sp)
{
struct pppoe_softc *sc = (void *)sp;
int wtime;

if (sc->sc_state != PPPOE_STATE_INITIAL)
return;

if (sc->sc_sppp.pp_phase == SPPP_PHASE_ESTABLISH &&
sc->sc_sppp.pp_auth_failures > 0) {
/*
* Delay trying to reconnect a bit more - the peer
* might have failed to contact it's radius server.
*/
wtime = PPPOE_RECON_FAST * sc->sc_sppp.pp_auth_failures;
if (wtime > PPPOE_SLOW_RETRY)
wtime = PPPOE_SLOW_RETRY;
} else {
wtime = PPPOE_RECON_IMMEDIATE;
}
callout_reset(&sc->sc_timeout, wtime, pppoe_timeout, sc);
}

static void
pppoe_tlf(struct sppp *sp)
{
struct pppoe_softc *sc = (void *)sp;
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;
callout_reset(&sc->sc_timeout, hz/50, pppoe_timeout, sc);
}

static void
pppoe_start(struct ifnet *ifp)
{
struct pppoe_softc *sc = (void *)ifp;
struct mbuf *m;
uint8_t *p;
size_t len;

if (sppp_isempty(ifp))
return;

/* are we ready to process data yet? */
if (sc->sc_state < PPPOE_STATE_SESSION) {
sppp_flush(&sc->sc_sppp.pp_if);
return;
}

while ((m = sppp_dequeue(ifp)) != NULL) {
len = m->m_pkthdr.len;
M_PREPEND(m, PPPOE_HEADERLEN, M_DONTWAIT);
if (m == NULL) {
ifp->if_oerrors++;
continue;
}
p = mtod(m, uint8_t *);
PPPOE_ADD_HEADER(p, 0, sc->sc_session, len);

bpf_mtap(&sc->sc_sppp.pp_if, m);

pppoe_output(sc, m);
}
}


static int
pppoe_ifattach_hook(void *arg, struct mbuf **mp, struct ifnet *ifp, int dir)
{
struct pppoe_softc *sc;
int s;

if (mp != (struct mbuf **)PFIL_IFNET_DETACH)
return 0;

s = splnet();
LIST_FOREACH(sc, &pppoe_softc_list, sc_list) {
if (sc->sc_eth_if != ifp)
continue;
if (sc->sc_sppp.pp_if.if_flags & IFF_UP) {
sc->sc_sppp.pp_if.if_flags &= ~(IFF_UP|IFF_RUNNING);
printf("%s: ethernet interface detached, going down\n",
sc->sc_sppp.pp_if.if_xname);
}
sc->sc_eth_if = NULL;
pppoe_clear_softc(sc, "ethernet interface detached");
}
splx(s);

return 0;
}

static void
pppoe_clear_softc(struct pppoe_softc *sc, const char *message)
{
/* stop timer */
callout_stop(&sc->sc_timeout);
if (sc->sc_sppp.pp_if.if_flags & IFF_DEBUG)
printf("%s: session 0x%x terminated, %s\n",
sc->sc_sppp.pp_if.if_xname, sc->sc_session, message);

/* fix our state */
sc->sc_state = PPPOE_STATE_INITIAL;

/* signal upper layer */
sc->sc_sppp.pp_down(&sc->sc_sppp);

/* clean up softc */
memcpy(&sc->sc_dest, etherbroadcastaddr, sizeof(sc->sc_dest));
if (sc->sc_ac_cookie) {
free(sc->sc_ac_cookie, M_DEVBUF);
sc->sc_ac_cookie = NULL;
}
if (sc->sc_relay_sid) {
free(sc->sc_relay_sid, M_DEVBUF);
sc->sc_relay_sid = NULL;
}
sc->sc_ac_cookie_len = 0;
sc->sc_session = 0;
}
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