File: [local] / src / sys / net / if_pppoe.c (download)
Revision 1.83, Thu Jul 14 11:03:15 2022 UTC (22 months, 4 weeks ago) by mvs
Branch: MAIN
CVS Tags: OPENBSD_7_5_BASE, OPENBSD_7_5, OPENBSD_7_4_BASE, OPENBSD_7_4, OPENBSD_7_3_BASE, OPENBSD_7_3, OPENBSD_7_2_BASE, OPENBSD_7_2, HEAD
Changes since 1.82: +18 -18 lines
Turn pppoe(4) back to kernel lock. We can't predict netlock state within
pppoe_start(), so we can't use it for pppoe(4) data protection. Except
input path, pppoe(4) always accessed with kernel lock held, so grab it
around pppoeintr() too.
Interfaces should not use netlock for their data protection. They should
rely on kernel lock or implement their own.
ok bluhm@ bket@
|
/* $OpenBSD: if_pppoe.c,v 1.83 2022/07/14 11:03:15 mvs Exp $ */
/* $NetBSD: if_pppoe.c,v 1.51 2003/11/28 08:56:48 keihan 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.
*
* 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 "pppoe.h"
#include "bpfilter.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/timeout.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/syslog.h>
#include <sys/ioctl.h>
#include <net/if.h>
#include <net/if_var.h>
#include <net/if_types.h>
#include <net/if_sppp.h>
#include <net/if_pppoe.h>
#include <net/netisr.h>
#include <netinet/in.h>
#include <netinet/if_ether.h>
#if NBPFILTER > 0
#include <net/bpf.h>
#endif
#undef PPPOE_DEBUG /* XXX - remove this or make it an option */
#define PPPOEDEBUG(a) ((sc->sc_sppp.pp_if.if_flags & IFF_DEBUG) ? printf a : 0)
struct pppoehdr {
u_int8_t vertype;
u_int8_t code;
u_int16_t session;
u_int16_t plen;
} __packed;
struct pppoetag {
u_int16_t tag;
u_int16_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 /* RFC 4638 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_MTU (ETHERMTU - PPPOE_OVERHEAD)
#define PPPOE_MAXMTU PP_MAX_MRU
/* 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 5 /* base for quick timeout calculation (seconds) */
#define PPPOE_SLOW_RETRY 60 /* persistent retry interval (seconds) */
#define PPPOE_DISC_MAXPADI 4 /* retry PADI four times (quickly) */
#define PPPOE_DISC_MAXPADR 2 /* retry PADR twice */
/*
* Locks used to protect struct members and global data
* I immutable after creation
* K kernel lock
*/
struct pppoe_softc {
struct sppp sc_sppp; /* contains a struct ifnet as first element */
LIST_ENTRY(pppoe_softc) sc_list;/* [K] */
unsigned int sc_eth_ifidx; /* [K] */
int sc_state; /* [K] discovery phase or session connected */
struct ether_addr sc_dest; /* [K] hardware address of concentrator */
u_int16_t sc_session; /* [K] PPPoE session id */
char *sc_service_name; /* [K] if != NULL: requested name of service */
char *sc_concentrator_name; /* [K] if != NULL: requested concentrator id */
u_int8_t *sc_ac_cookie; /* [K] content of AC cookie we must echo back */
size_t sc_ac_cookie_len; /* [K] length of cookie data */
u_int8_t *sc_relay_sid; /* [K] content of relay SID we must echo back */
size_t sc_relay_sid_len; /* [K] length of relay SID data */
u_int32_t sc_unique; /* [I] our unique id */
struct timeout sc_timeout; /* [K] timeout while not in session state */
int sc_padi_retried; /* [K] number of PADI retries already done */
int sc_padr_retried; /* [K] number of PADR retries already done */
struct timeval sc_session_time; /* [K] time the session was established */
};
/* input routines */
void pppoe_disc_input(struct mbuf *);
void pppoe_data_input(struct mbuf *);
static void pppoe_dispatch_disc_pkt(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, caddr_t);
static void pppoe_tls(struct sppp *);
static void pppoe_tlf(struct sppp *);
static void pppoe_start(struct ifnet *);
/* internal timeout handling */
static void pppoe_timeout(void *);
/* sending actual protocol control packets */
static int pppoe_send_padi(struct pppoe_softc *);
static int pppoe_send_padr(struct pppoe_softc *);
static int pppoe_send_padt(unsigned int, u_int, const u_int8_t *, u_int8_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, u_int);
static struct pppoe_softc *pppoe_find_softc_by_hunique(u_int8_t *, size_t, u_int);
static struct mbuf *pppoe_get_mbuf(size_t len);
LIST_HEAD(pppoe_softc_head, pppoe_softc) pppoe_softc_list;
/* interface cloning */
int pppoe_clone_create(struct if_clone *, int);
int pppoe_clone_destroy(struct ifnet *);
struct if_clone pppoe_cloner =
IF_CLONE_INITIALIZER("pppoe", pppoe_clone_create, pppoe_clone_destroy);
struct mbuf_queue pppoediscinq = MBUF_QUEUE_INITIALIZER(
IFQ_MAXLEN, IPL_SOFTNET);
struct mbuf_queue pppoeinq = MBUF_QUEUE_INITIALIZER(
IFQ_MAXLEN, IPL_SOFTNET);
void pppoeintr(void)
{
struct mbuf_list ml;
struct mbuf *m;
NET_ASSERT_LOCKED();
mq_delist(&pppoediscinq, &ml);
while ((m = ml_dequeue(&ml)) != NULL)
pppoe_disc_input(m);
mq_delist(&pppoeinq, &ml);
while ((m = ml_dequeue(&ml)) != NULL)
pppoe_data_input(m);
}
void
pppoeattach(int count)
{
LIST_INIT(&pppoe_softc_list);
if_clone_attach(&pppoe_cloner);
}
/* Create a new interface. */
int
pppoe_clone_create(struct if_clone *ifc, int unit)
{
struct pppoe_softc *sc, *tmpsc;
u_int32_t unique;
sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO);
snprintf(sc->sc_sppp.pp_if.if_xname,
sizeof(sc->sc_sppp.pp_if.if_xname),
"pppoe%d", unit);
sc->sc_sppp.pp_if.if_softc = sc;
sc->sc_sppp.pp_if.if_mtu = PPPOE_MTU;
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_flags |= PP_KEEPALIVE; /* use LCP keepalive */
sc->sc_sppp.pp_framebytes = PPPOE_HEADERLEN; /* framing added to ppp packets */
sc->sc_sppp.pp_if.if_ioctl = pppoe_ioctl;
sc->sc_sppp.pp_if.if_start = pppoe_start;
sc->sc_sppp.pp_if.if_rtrequest = p2p_rtrequest;
sc->sc_sppp.pp_if.if_xflags = IFXF_CLONED;
sc->sc_sppp.pp_tls = pppoe_tls;
sc->sc_sppp.pp_tlf = pppoe_tlf;
/* changed to real address later */
memcpy(&sc->sc_dest, etherbroadcastaddr, sizeof(sc->sc_dest));
/* init timer for interface watchdog */
timeout_set_proc(&sc->sc_timeout, pppoe_timeout, sc);
if_attach(&sc->sc_sppp.pp_if);
if_alloc_sadl(&sc->sc_sppp.pp_if);
sppp_attach(&sc->sc_sppp.pp_if);
#if NBPFILTER > 0
bpfattach(&sc->sc_sppp.pp_if.if_bpf, &sc->sc_sppp.pp_if, DLT_PPP_ETHER, 0);
#endif
NET_LOCK();
retry:
unique = arc4random();
LIST_FOREACH(tmpsc, &pppoe_softc_list, sc_list)
if (tmpsc->sc_unique == unique)
goto retry;
sc->sc_unique = unique;
LIST_INSERT_HEAD(&pppoe_softc_list, sc, sc_list);
NET_UNLOCK();
return (0);
}
/* Destroy a given interface. */
int
pppoe_clone_destroy(struct ifnet *ifp)
{
struct pppoe_softc *sc = ifp->if_softc;
NET_LOCK();
LIST_REMOVE(sc, sc_list);
NET_UNLOCK();
timeout_del(&sc->sc_timeout);
sppp_detach(&sc->sc_sppp.pp_if);
if_detach(ifp);
if (sc->sc_concentrator_name)
free(sc->sc_concentrator_name, M_DEVBUF,
strlen(sc->sc_concentrator_name) + 1);
if (sc->sc_service_name)
free(sc->sc_service_name, M_DEVBUF,
strlen(sc->sc_service_name) + 1);
if (sc->sc_ac_cookie)
free(sc->sc_ac_cookie, M_DEVBUF, sc->sc_ac_cookie_len);
if (sc->sc_relay_sid)
free(sc->sc_relay_sid, M_DEVBUF, sc->sc_relay_sid_len);
free(sc, M_DEVBUF, sizeof(*sc));
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, u_int ifidx)
{
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_ifidx == ifidx) {
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(u_int8_t *token, size_t len, u_int ifidx)
{
struct pppoe_softc *sc;
u_int32_t hunique;
if (LIST_EMPTY(&pppoe_softc_list))
return (NULL);
if (len != sizeof(hunique))
return (NULL);
memcpy(&hunique, token, len);
LIST_FOREACH(sc, &pppoe_softc_list, sc_list)
if (sc->sc_unique == hunique)
break;
if (sc == NULL) {
printf("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("%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_ifidx != ifidx) {
printf("%s: wrong interface, not accepting host unique\n",
sc->sc_sppp.pp_if.if_xname);
return (NULL);
}
return (sc);
}
/* Analyze and handle a single received packet while not in session state. */
static void
pppoe_dispatch_disc_pkt(struct mbuf *m)
{
struct pppoe_softc *sc;
struct pppoehdr *ph;
struct pppoetag *pt;
struct mbuf *n;
struct ether_header *eh;
const char *err_msg, *devname;
size_t ac_cookie_len;
size_t relay_sid_len;
int off, noff, err, errortag, max_payloadtag;
u_int16_t max_payload;
u_int16_t tag, len;
u_int16_t session, plen;
u_int8_t *ac_cookie;
u_int8_t *relay_sid;
u_int8_t code;
err_msg = NULL;
devname = "pppoe";
off = 0;
errortag = 0;
max_payloadtag = 0;
if (m->m_len < sizeof(*eh)) {
m = m_pullup(m, sizeof(*eh));
if (m == NULL)
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;
max_payload = 0;
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 == NULL) {
printf("pppoe: could not get PPPoE header\n");
m = NULL;
goto done;
}
ph = (struct pppoehdr *)(mtod(n, caddr_t) + 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);
code = ph->code;
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;
}
/* ignore trailing garbage */
m_adj(m, off + plen - m->m_pkthdr.len);
tag = 0;
len = 0;
sc = NULL;
while (off + sizeof(*pt) <= m->m_pkthdr.len) {
n = m_pulldown(m, off, sizeof(*pt), &noff);
if (n == NULL) {
printf("%s: parse error\n", devname);
m = NULL;
goto done;
}
pt = (struct pppoetag *)(mtod(n, caddr_t) + noff);
tag = ntohs(pt->tag);
len = ntohs(pt->len);
off += sizeof(*pt);
if (off + len > m->m_pkthdr.len) {
printf("%s: tag 0x%x len 0x%x is too long\n",
devname, 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;
n = m_pulldown(m, off, len, &noff);
if (n == NULL) {
m = NULL;
err_msg = "TAG HUNIQUE ERROR";
break;
}
sc = pppoe_find_softc_by_hunique(mtod(n, caddr_t) + noff,
len, m->m_pkthdr.ph_ifidx);
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, len,
&noff);
if (n == NULL) {
err_msg = "TAG ACCOOKIE ERROR";
m = NULL;
break;
}
ac_cookie = mtod(n, caddr_t) + noff;
ac_cookie_len = len;
}
break;
case PPPOE_TAG_RELAYSID:
if (relay_sid == NULL) {
n = m_pulldown(m, off, len,
&noff);
if (n == NULL) {
err_msg = "TAG RELAYSID ERROR";
m = NULL;
break;
}
relay_sid = mtod(n, caddr_t) + noff;
relay_sid_len = len;
}
break;
case PPPOE_TAG_MAX_PAYLOAD:
if (!max_payloadtag) {
n = m_pulldown(m, off, len,
&noff);
if (n == NULL || len != sizeof(max_payload)) {
err_msg = "TAG MAX_PAYLOAD ERROR";
m = NULL;
break;
}
memcpy(&max_payload, mtod(n, caddr_t) + noff,
sizeof(max_payload));
max_payloadtag = 1;
}
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) {
log(LOG_INFO, "%s: %s: ", devname, err_msg);
if (errortag && len) {
n = m_pulldown(m, off, len,
&noff);
if (n == NULL) {
m = NULL;
} else {
u_int8_t *et = mtod(n, caddr_t) + noff;
while (len--)
addlog("%c", *et++);
}
}
addlog("\n");
goto done;
}
off += len;
}
breakbreak:
switch (code) {
case PPPOE_CODE_PADI:
case PPPOE_CODE_PADR:
/* ignore, we are no access concentrator */
goto done;
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_len);
sc->sc_ac_cookie = malloc(ac_cookie_len, M_DEVBUF,
M_DONTWAIT);
if (sc->sc_ac_cookie == NULL) {
sc->sc_ac_cookie_len = 0;
goto done;
}
sc->sc_ac_cookie_len = ac_cookie_len;
memcpy(sc->sc_ac_cookie, ac_cookie, ac_cookie_len);
} else if (sc->sc_ac_cookie) {
free(sc->sc_ac_cookie, M_DEVBUF, sc->sc_ac_cookie_len);
sc->sc_ac_cookie = NULL;
sc->sc_ac_cookie_len = 0;
}
if (relay_sid) {
if (sc->sc_relay_sid)
free(sc->sc_relay_sid, M_DEVBUF,
sc->sc_relay_sid_len);
sc->sc_relay_sid = malloc(relay_sid_len, M_DEVBUF,
M_DONTWAIT);
if (sc->sc_relay_sid == NULL) {
sc->sc_relay_sid_len = 0;
goto done;
}
sc->sc_relay_sid_len = relay_sid_len;
memcpy(sc->sc_relay_sid, relay_sid, relay_sid_len);
} else if (sc->sc_relay_sid) {
free(sc->sc_relay_sid, M_DEVBUF, sc->sc_relay_sid_len);
sc->sc_relay_sid = NULL;
sc->sc_relay_sid_len = 0;
}
if (sc->sc_sppp.pp_if.if_mtu > PPPOE_MTU &&
(!max_payloadtag ||
ntohs(max_payload) != sc->sc_sppp.pp_if.if_mtu)) {
printf("%s: No valid PPP-Max-Payload tag received in PADO\n",
sc->sc_sppp.pp_if.if_xname);
sc->sc_sppp.pp_if.if_mtu = PPPOE_MTU;
}
memcpy(&sc->sc_dest, eh->ether_shost, sizeof(sc->sc_dest));
sc->sc_padr_retried = 0;
sc->sc_state = PPPOE_STATE_PADR_SENT;
if ((err = pppoe_send_padr(sc)) != 0) {
PPPOEDEBUG(("%s: failed to send PADR, error=%d\n",
sc->sc_sppp.pp_if.if_xname, err));
}
timeout_add_sec(&sc->sc_timeout,
PPPOE_DISC_TIMEOUT * (1 + sc->sc_padr_retried));
break;
case PPPOE_CODE_PADS:
if (sc == NULL)
goto done;
sc->sc_session = session;
timeout_del(&sc->sc_timeout);
PPPOEDEBUG(("%s: session 0x%x connected\n",
sc->sc_sppp.pp_if.if_xname, session));
sc->sc_state = PPPOE_STATE_SESSION;
getmicrouptime(&sc->sc_session_time);
sc->sc_sppp.pp_up(&sc->sc_sppp); /* notify upper layers */
break;
case PPPOE_CODE_PADT:
if (sc == NULL)
goto done;
/* stop timer (we might be about to transmit a PADT ourself) */
timeout_del(&sc->sc_timeout);
PPPOEDEBUG(("%s: session 0x%x terminated, received PADT\n",
sc->sc_sppp.pp_if.if_xname, session));
/* clean up 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_len);
sc->sc_ac_cookie = NULL;
}
if (sc->sc_relay_sid) {
free(sc->sc_relay_sid, M_DEVBUF, sc->sc_relay_sid_len);
sc->sc_relay_sid = NULL;
}
sc->sc_ac_cookie_len = 0;
sc->sc_relay_sid_len = 0;
sc->sc_session = 0;
sc->sc_session_time.tv_sec = 0;
sc->sc_session_time.tv_usec = 0;
sc->sc_sppp.pp_down(&sc->sc_sppp); /* signal upper layer */
break;
default:
printf("%s: unknown code (0x%04x) session = 0x%04x\n",
sc ? sc->sc_sppp.pp_if.if_xname : "pppoe",
code, session);
break;
}
done:
m_freem(m);
}
/* Input function for discovery packets. */
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);
} else
m_freem(m);
}
/* Input function for data packets */
void
pppoe_data_input(struct mbuf *m)
{
struct pppoe_softc *sc;
struct pppoehdr *ph;
u_int16_t session, plen;
#ifdef PPPOE_TERM_UNKNOWN_SESSIONS
u_int8_t shost[ETHER_ADDR_LEN];
#endif
if (LIST_EMPTY(&pppoe_softc_list))
goto drop;
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 == NULL) {
printf("pppoe (data): 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.ph_ifidx);
if (sc == NULL) {
#ifdef PPPOE_TERM_UNKNOWN_SESSIONS
printf("pppoe (data): input for unknown session 0x%x, sending PADT\n",
session);
pppoe_send_padt(m->m_pkthdr.ph_ifidx, session, shost, 0);
#endif
goto drop;
}
plen = ntohs(ph->plen);
#if NBPFILTER > 0
if(sc->sc_sppp.pp_if.if_bpf)
bpf_mtap(sc->sc_sppp.pp_if.if_bpf, m, BPF_DIRECTION_IN);
#endif
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.ph_ifidx = sc->sc_sppp.pp_if.if_index;
/* 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;
struct ifnet *eth_if;
u_int16_t etype;
int ret;
if ((eth_if = if_get(sc->sc_eth_ifidx)) == NULL) {
m_freem(m);
return (EIO);
}
if ((eth_if->if_flags & (IFF_UP|IFF_RUNNING))
!= (IFF_UP|IFF_RUNNING)) {
if_put(eth_if);
m_freem(m);
return (ENETDOWN);
}
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);
PPPOEDEBUG(("%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((unsigned char *)&sc->sc_dest), m->m_pkthdr.len));
m->m_flags &= ~(M_BCAST|M_MCAST);
/* encapsulated packet is forced into rdomain of physical interface */
m->m_pkthdr.ph_rtableid = eth_if->if_rdomain;
ret = eth_if->if_output(eth_if, m, &dst, NULL);
if_put(eth_if);
return (ret);
}
/* The ioctl routine. */
static int
pppoe_ioctl(struct ifnet *ifp, unsigned long cmd, caddr_t data)
{
struct proc *p = curproc; /* XXX */
struct pppoe_softc *sc = (struct pppoe_softc *)ifp;
struct ifnet *eth_if;
int error = 0;
switch (cmd) {
case PPPOESETPARMS:
{
struct pppoediscparms *parms = (struct pppoediscparms *)data;
int len;
if ((error = suser(p)) != 0)
return (error);
if (parms->eth_ifname[0] != '\0') {
struct ifnet *eth_if;
eth_if = if_unit(parms->eth_ifname);
if (eth_if == NULL || eth_if->if_type != IFT_ETHER) {
if_put(eth_if);
sc->sc_eth_ifidx = 0;
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_ifidx = eth_if->if_index;
if_put(eth_if);
}
if (sc->sc_concentrator_name)
free(sc->sc_concentrator_name, M_DEVBUF,
strlen(sc->sc_concentrator_name) + 1);
sc->sc_concentrator_name = NULL;
len = strlen(parms->ac_name);
if (len > 0 && len < sizeof(parms->ac_name)) {
char *p = malloc(len + 1, M_DEVBUF, M_WAITOK|M_CANFAIL);
if (p == NULL)
return (ENOMEM);
strlcpy(p, parms->ac_name, len + 1);
sc->sc_concentrator_name = p;
}
if (sc->sc_service_name)
free(sc->sc_service_name, M_DEVBUF,
strlen(sc->sc_service_name) + 1);
sc->sc_service_name = NULL;
len = strlen(parms->service_name);
if (len > 0 && len < sizeof(parms->service_name)) {
char *p = malloc(len + 1, M_DEVBUF, M_WAITOK|M_CANFAIL);
if (p == NULL)
return (ENOMEM);
strlcpy(p, parms->service_name, len + 1);
sc->sc_service_name = p;
}
return (0);
}
break;
case PPPOEGETPARMS:
{
struct pppoediscparms *parms = (struct pppoediscparms *)data;
if ((eth_if = if_get(sc->sc_eth_ifidx)) != NULL) {
strlcpy(parms->eth_ifname, eth_if->if_xname,
IFNAMSIZ);
if_put(eth_if);
} else
parms->eth_ifname[0] = '\0';
if (sc->sc_concentrator_name)
strlcpy(parms->ac_name, sc->sc_concentrator_name,
sizeof(parms->ac_name));
else
parms->ac_name[0] = '\0';
if (sc->sc_service_name)
strlcpy(parms->service_name, sc->sc_service_name,
sizeof(parms->service_name));
else
parms->service_name[0] = '\0';
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;
state->session_time.tv_sec = sc->sc_session_time.tv_sec;
state->session_time.tv_usec = sc->sc_session_time.tv_usec;
return (0);
}
break;
case SIOCSIFFLAGS:
{
struct ifreq *ifr = (struct ifreq *)data;
/*
* 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) {
timeout_del(&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:
{
struct ifreq *ifr = (struct ifreq *)data;
eth_if = if_get(sc->sc_eth_ifidx);
if (ifr->ifr_mtu > MIN(PPPOE_MAXMTU,
(eth_if == NULL ? PPPOE_MAXMTU :
(eth_if->if_mtu - PPPOE_OVERHEAD))))
error = EINVAL;
else
error = 0;
if_put(eth_if);
if (error != 0)
return (error);
return (sppp_ioctl(ifp, cmd, data));
}
default:
error = sppp_ioctl(ifp, cmd, data);
if (error == ENETRESET) {
error = 0;
if ((ifp->if_flags & (IFF_UP | IFF_RUNNING)) ==
(IFF_UP | IFF_RUNNING)) {
if_down(ifp);
if (sc->sc_state >= PPPOE_STATE_PADI_SENT &&
sc->sc_state < PPPOE_STATE_SESSION) {
timeout_del(&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));
}
error = sppp_ioctl(ifp, SIOCSIFFLAGS, NULL);
if (error)
return (error);
if_up(ifp);
return (sppp_ioctl(ifp, SIOCSIFFLAGS, NULL));
}
}
return (error);
}
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;
if (len + sizeof(struct ether_header) > MCLBYTES)
return NULL;
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.ph_ifidx = 0;
return (m);
}
/* Send PADI. */
static int
pppoe_send_padi(struct pppoe_softc *sc)
{
struct mbuf *m0;
int len, l1 = 0, l2 = 0; /* XXX: gcc */
u_int8_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->sc_unique); /* service name tag is required, host unique is sent 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_MTU)
len += 2 + 2 + 2;
/* allocate a buffer */
m0 = pppoe_get_mbuf(len + PPPOE_HEADERLEN); /* header len + payload len */
if (m0 == NULL)
return (ENOBUFS);
m0->m_pkthdr.pf.prio = sc->sc_sppp.pp_if.if_llprio;
/* fill in pkt */
p = mtod(m0, u_int8_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->sc_unique));
memcpy(p, &sc->sc_unique, sizeof(sc->sc_unique));
p += sizeof(sc->sc_unique);
if (sc->sc_sppp.pp_if.if_mtu > PPPOE_MTU) {
PPPOE_ADD_16(p, PPPOE_TAG_MAX_PAYLOAD);
PPPOE_ADD_16(p, 2);
PPPOE_ADD_16(p, (u_int16_t)sc->sc_sppp.pp_if.if_mtu);
}
#ifdef PPPOE_DEBUG
if (p - mtod(m0, u_int8_t *) != len + PPPOE_HEADERLEN)
panic("pppoe_send_padi: garbled output len, should be %ld, is %ld",
(long)(len + PPPOE_HEADERLEN), (long)(p - mtod(m0, u_int8_t *)));
#endif
/* send pkt */
return (pppoe_output(sc, m0));
}
/* Watchdog function. */
static void
pppoe_timeout(void *arg)
{
struct pppoe_softc *sc = (struct pppoe_softc *)arg;
int x, retry_wait, err;
PPPOEDEBUG(("%s: timeout\n", sc->sc_sppp.pp_if.if_xname));
NET_LOCK();
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);
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);
break;
}
}
if ((err = pppoe_send_padi(sc)) != 0) {
sc->sc_padi_retried--;
PPPOEDEBUG(("%s: failed to transmit PADI, error=%d\n",
sc->sc_sppp.pp_if.if_xname, err));
}
timeout_add_sec(&sc->sc_timeout, retry_wait);
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) {
PPPOEDEBUG(("%s: failed to send PADI, error=%d\n",
sc->sc_sppp.pp_if.if_xname, err));
}
timeout_add_sec(&sc->sc_timeout,
PPPOE_DISC_TIMEOUT * (1 + sc->sc_padi_retried));
splx(x);
break;
}
if ((err = pppoe_send_padr(sc)) != 0) {
sc->sc_padr_retried--;
PPPOEDEBUG(("%s: failed to send PADR, error=%d\n",
sc->sc_sppp.pp_if.if_xname, err));
}
timeout_add_sec(&sc->sc_timeout,
PPPOE_DISC_TIMEOUT * (1 + sc->sc_padr_retried));
splx(x);
break;
case PPPOE_STATE_CLOSING:
pppoe_disconnect(sc);
break;
default:
break; /* all done, work in peace */
}
NET_UNLOCK();
}
/* 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);
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)
PPPOEDEBUG(("%s: failed to send PADI, error=%d\n",
sc->sc_sppp.pp_if.if_xname, err));
timeout_add_sec(&sc->sc_timeout, PPPOE_DISC_TIMEOUT);
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 {
PPPOEDEBUG(("%s: disconnecting\n",
sc->sc_sppp.pp_if.if_xname));
err = pppoe_send_padt(sc->sc_eth_ifidx,
sc->sc_session, (const u_int8_t *)&sc->sc_dest,
sc->sc_sppp.pp_if.if_llprio);
}
/* 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_len);
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_len);
sc->sc_relay_sid = NULL;
}
sc->sc_relay_sid_len = 0;
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;
u_int8_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->sc_unique); /* 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_MTU)
len += 2 + 2 + 2;
m0 = pppoe_get_mbuf(len + PPPOE_HEADERLEN);
if (m0 == NULL)
return (ENOBUFS);
m0->m_pkthdr.pf.prio = sc->sc_sppp.pp_if.if_llprio;
p = mtod(m0, u_int8_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->sc_unique));
memcpy(p, &sc->sc_unique, sizeof(sc->sc_unique));
p += sizeof(sc->sc_unique);
if (sc->sc_sppp.pp_if.if_mtu > PPPOE_MTU) {
PPPOE_ADD_16(p, PPPOE_TAG_MAX_PAYLOAD);
PPPOE_ADD_16(p, 2);
PPPOE_ADD_16(p, (u_int16_t)sc->sc_sppp.pp_if.if_mtu);
}
#ifdef PPPOE_DEBUG
if (p - mtod(m0, u_int8_t *) != len + PPPOE_HEADERLEN)
panic("pppoe_send_padr: garbled output len, should be %ld, is %ld",
(long)(len + PPPOE_HEADERLEN), (long)(p - mtod(m0, u_int8_t *)));
#endif
return (pppoe_output(sc, m0));
}
/* Send a PADT packet. */
static int
pppoe_send_padt(unsigned int ifidx, u_int session, const u_int8_t *dest, u_int8_t prio)
{
struct ether_header *eh;
struct sockaddr dst;
struct ifnet *eth_if;
struct mbuf *m0;
u_int8_t *p;
int ret;
if ((eth_if = if_get(ifidx)) == NULL)
return (EINVAL);
m0 = pppoe_get_mbuf(PPPOE_HEADERLEN);
if (m0 == NULL) {
if_put(eth_if);
return (ENOBUFS);
}
m0->m_pkthdr.pf.prio = prio;
p = mtod(m0, u_int8_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);
/* encapsulated packet is forced into rdomain of physical interface */
m0->m_pkthdr.ph_rtableid = eth_if->if_rdomain;
ret = eth_if->if_output(eth_if, m0, &dst, NULL);
if_put(eth_if);
return (ret);
}
/* this-layer-start function */
static void
pppoe_tls(struct sppp *sp)
{
struct pppoe_softc *sc = (void *)sp;
if (sc->sc_state != PPPOE_STATE_INITIAL)
return;
pppoe_connect(sc);
}
/* this-layer-finish function */
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;
timeout_add_msec(&sc->sc_timeout, 20);
}
static void
pppoe_start(struct ifnet *ifp)
{
struct pppoe_softc *sc = (void *)ifp;
struct mbuf *m;
size_t len;
u_int8_t *p;
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, u_int8_t *);
PPPOE_ADD_HEADER(p, 0, sc->sc_session, len);
#if NBPFILTER > 0
if(sc->sc_sppp.pp_if.if_bpf)
bpf_mtap(sc->sc_sppp.pp_if.if_bpf, m,
BPF_DIRECTION_OUT);
#endif
pppoe_output(sc, m);
}
}
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