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NetBSD/sys/net/if_pppoe.c

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/* $NetBSD: if_pppoe.c,v 1.9 2001/12/01 18:25:23 martin Exp $ */
/*
* Copyright (c) 2001 Martin Husemann. All rights reserved.
*
* 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 AUTHOR 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 AUTHOR 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 1.9 2001/12/01 18:25:23 martin Exp $");
#include "pppoe.h"
#include "bpfilter.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 <net/if.h>
#include <net/if_types.h>
#include <net/if_ether.h>
#include <net/if_sppp.h>
#include <net/if_pppoe.h>
#if NBPFILTER > 0
#include <net/bpf.h>
#endif
#undef PPPOE_DEBUG /* XXX - remove this or make it an option */
/* #define PPPOE_DEBUG 1 */
#define PPPOE_HEADERLEN 6
#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_SNAME_ERR 0x0201 /* service name error */
#define PPPOE_TAG_ACSYS_ERR 0x0202 /* AC system error */
#define PPPOE_TAG_GENERIC_ERR 0x0203 /* gerneric 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 */
/* Read a 16 bit unsigned value from a buffer */
#define PPPOE_READ_16(PTR, VAL) \
(VAL) = ((PTR)[0] << 8) | (PTR)[1]; \
(PTR)+=2
/* 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)
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 */
#define PPPOE_DISC_TIMEOUT hz/5
#define PPPOE_DISC_MAXPADI 4 /* retry PADI four times */
#define PPPOE_DISC_MAXPADR 2 /* retry PADR twice */
#define PPPOE_STATE_INITIAL 0
#define PPPOE_STATE_PADI_SENT 1
#define PPPOE_STATE_PADR_SENT 2
#define PPPOE_STATE_SESSION 3
#define PPPOE_STATE_CLOSING 4
int sc_state; /* discovery phase or session connected */
struct ether_addr sc_dest; /* hardware address of concentrator */
u_int16_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 */
u_int8_t *sc_ac_cookie; /* content of AC cookie we must echo back */
size_t sc_ac_cookie_len; /* length of cookie data */
struct callout 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 = { NULL };
struct ifqueue ppoeinq = { NULL };
#ifdef __HAVE_GENERIC_SOFT_INTERRUPTS
void * pppoe_softintr = NULL;
static void pppoe_softintr_handler(void *);
#else
struct callout pppoe_softintr = CALLOUT_INITIALIZER;
void pppoe_softintr_handler(void*);
#endif
extern int sppp_ioctl(struct ifnet *ifp, unsigned long cmd, void *data);
/* input routines */
static void pppoe_input(void);
static void pppoe_disc_input(struct mbuf *m);
static void pppoe_dispatch_disc_pkt(u_int8_t *p, size_t size, struct ifnet *rcvif, struct ether_header *eh);
static void pppoe_data_input(struct mbuf *m);
/* management routines */
void pppoeattach(int count);
static int pppoe_connect(struct pppoe_softc *sc);
static int pppoe_disconnect(struct pppoe_softc *sc);
static void pppoe_abort_connect(struct pppoe_softc *sc);
static int pppoe_ioctl(struct ifnet *ifp, unsigned long cmd, caddr_t data);
static void pppoe_tls(struct sppp *sp);
static void pppoe_tlf(struct sppp *sp);
static void pppoe_start(struct ifnet *ifp);
/* internal timeout handling */
static void pppoe_timeout(void*);
/* sending actual protocol controll packets */
static int pppoe_send_padi(struct pppoe_softc *sc);
static int pppoe_send_padr(struct pppoe_softc *sc);
static int pppoe_send_padt(struct pppoe_softc *sc);
/* raw output */
static int pppoe_output(struct pppoe_softc *sc, struct mbuf *m);
/* internal helper functions */
static struct pppoe_softc * pppoe_find_softc_by_session(u_int session, struct ifnet *rcvif);
static struct pppoe_softc * pppoe_find_softc_by_hunique(u_int8_t *token, size_t len, struct ifnet *rcvif);
LIST_HEAD(pppoe_softc_head, pppoe_softc) pppoe_softc_list;
int pppoe_clone_create __P((struct if_clone *, int));
void pppoe_clone_destroy __P((struct ifnet *));
struct if_clone pppoe_cloner =
IF_CLONE_INITIALIZER("pppoe", pppoe_clone_create, pppoe_clone_destroy);
/* ARGSUSED */
void
pppoeattach(count)
int count;
{
LIST_INIT(&pppoe_softc_list);
if_clone_attach(&pppoe_cloner);
ppoediscinq.ifq_maxlen = IFQ_MAXLEN;
ppoeinq.ifq_maxlen = IFQ_MAXLEN;
#ifdef __HAVE_GENERIC_SOFT_INTERRUPTS
pppoe_softintr = softintr_establish(IPL_SOFTNET, pppoe_softintr_handler, NULL);
#endif
}
int
pppoe_clone_create(ifc, unit)
struct if_clone *ifc;
int unit;
{
struct pppoe_softc *sc;
sc = malloc(sizeof(struct pppoe_softc), M_DEVBUF, M_WAITOK);
memset(sc, 0, sizeof(struct pppoe_softc));
sprintf(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 = ETHERMTU - PPPOE_HEADERLEN - 2; /* two byte PPP protocol discriminator, then IP data */
sc->sc_sppp.pp_if.if_flags = IFF_SIMPLEX | IFF_POINTOPOINT
| IFF_MULTICAST | IFF_LINK1; /* auto "dial" */
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_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);
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);
#if NBPFILTER > 0
bpfattach(&sc->sc_sppp.pp_if, DLT_PPP_ETHER, 0);
#endif
LIST_INSERT_HEAD(&pppoe_softc_list, sc, sc_list);
return 0;
}
void
pppoe_clone_destroy(ifp)
struct ifnet *ifp;
{
struct pppoe_softc * sc = ifp->if_softc;
LIST_REMOVE(sc, sc_list);
#if NBPFILTER > 0
bpfdetach(ifp);
#endif
sppp_detach(&sc->sc_sppp.pp_if);
if_detach(ifp);
free(sc, M_DEVBUF);
}
/*
* 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) {
if (sc->sc_eth_if == 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(u_int8_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 != t) {
#ifdef PPPOE_DEBUG
printf("pppoe: invalid host unique value\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) {
#ifdef PPPOE_DEBUG
printf("%s: state=%d, not accepting host unique\n",
sc->sc_sppp.pp_if.if_xname, sc->sc_state);
#endif
return NULL;
}
if (sc->sc_eth_if != rcvif) {
#ifdef PPPOE_DEBUG
printf("%s: wrong interface, not accepting host unique\n",
sc->sc_sppp.pp_if.if_xname);
#endif
return NULL;
}
return sc;
}
#ifdef __HAVE_GENERIC_SOFT_INTERRUPTS
static void pppoe_softintr_handler(void *dummy)
{
/* called at splsoftnet() */
pppoe_input();
}
#else
void pppoe_softintr_handler(void *dummy)
{
int s = splnet();
pppoe_input();
callout_deactivate(&pppoe_softintr);
splx(s);
}
#endif
/* called at appropriate protection level */
static void
pppoe_input()
{
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(u_int8_t *p, size_t size, struct ifnet *rcvif, struct ether_header *eh)
{
u_int16_t tag, len;
u_int8_t vertype, code;
u_int16_t session, plen;
struct pppoe_softc *sc;
const char *err_msg = NULL;
u_int8_t * ac_cookie;
size_t ac_cookie_len;
ac_cookie = NULL;
ac_cookie_len = 0;
session = 0;
if (size <= PPPOE_HEADERLEN) {
printf("pppoe: packet too short: %ld\n", (long)size);
return;
}
vertype = *p++;
if (vertype != PPPOE_VERTYPE) {
printf("pppoe: unknown version/type packet: 0x%x\n", vertype);
return;
}
code = *p++;
PPPOE_READ_16(p, session);
PPPOE_READ_16(p, plen);
size -= PPPOE_HEADERLEN;
if (plen > size) {
printf("pppoe: packet content does not fit: data available = %ld, packet size = %ld\n",
(long)size, (long)plen);
return;
}
size = plen; /* ignore trailing garbage */
tag = 0;
len = 0;
sc = NULL;
while (size > 4) {
PPPOE_READ_16(p, tag);
PPPOE_READ_16(p, len);
if (len > size) {
printf("pppoe: tag 0x%x len 0x%x is too long\n", tag, len);
return;
}
switch (tag) {
case PPPOE_TAG_EOL:
size = 0; break;
case PPPOE_TAG_SNAME:
break; /* ignored */
case PPPOE_TAG_ACNAME:
break; /* ignored */
case PPPOE_TAG_HUNIQUE:
if (sc == NULL)
sc = pppoe_find_softc_by_hunique(p, len, rcvif);
break;
case PPPOE_TAG_ACCOOKIE:
if (ac_cookie == NULL) {
ac_cookie = p;
ac_cookie_len = len;
}
break;
case PPPOE_TAG_SNAME_ERR:
err_msg = "SERVICE NAME ERROR";
break;
case PPPOE_TAG_ACSYS_ERR:
err_msg = "AC SYSTEM ERROR";
break;
case PPPOE_TAG_GENERIC_ERR:
err_msg = "GENERIC ERROR";
break;
}
if (err_msg) {
printf("%s: %s\n", sc? sc->sc_sppp.pp_if.if_xname : "pppoe",
err_msg);
return;
}
if (size >= 0) {
size -= 4 + len;
if (len > 0)
p += len;
}
}
switch (code) {
case PPPOE_CODE_PADI:
case PPPOE_CODE_PADR:
/* ignore, we are no access concentrator */
return;
case PPPOE_CODE_PADO:
if (sc == NULL) {
printf("pppoe: received PADO but could not find request for it\n");
return;
}
if (sc->sc_state != PPPOE_STATE_PADI_SENT) {
printf("%s: received unexpected PADO\n", sc->sc_sppp.pp_if.if_xname);
return;
}
if (ac_cookie) {
sc->sc_ac_cookie = malloc(ac_cookie_len, M_DEVBUF, M_DONTWAIT);
if (sc->sc_ac_cookie == NULL)
return;
sc->sc_ac_cookie_len = ac_cookie_len;
memcpy(sc->sc_ac_cookie, ac_cookie, ac_cookie_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 (pppoe_send_padr(sc) == 0)
callout_reset(&sc->sc_timeout, PPPOE_DISC_TIMEOUT*(1+sc->sc_padr_retried), pppoe_timeout, sc);
else
pppoe_abort_connect(sc);
break;
case PPPOE_CODE_PADS:
if (sc == NULL)
return;
sc->sc_session = session;
callout_stop(&sc->sc_timeout);
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:
if (sc == NULL)
return;
/* stop timer (we might be about to transmit a PADT ourself) */
callout_stop(&sc->sc_timeout);
/* signal upper layer */
printf("%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_MBUF);
sc->sc_ac_cookie = NULL;
}
sc->sc_ac_cookie_len = 0;
sc->sc_session = 0;
sc->sc_sppp.pp_down(&sc->sc_sppp);
break;
default:
printf("%s: unknown code (0x%04x) session = 0x%04x\n",
sc? sc->sc_sppp.pp_if.if_xname : "pppoe",
code, session);
break;
}
}
static void
pppoe_disc_input(struct mbuf *m)
{
u_int8_t *p;
struct ether_header *eh;
eh = mtod(m, struct ether_header*);
m_adj(m, sizeof(struct ether_header));
p = mtod(m, u_int8_t*);
KASSERT(m->m_flags & M_PKTHDR);
pppoe_dispatch_disc_pkt(p, m->m_len, m->m_pkthdr.rcvif, eh);
m_free(m);
}
static void
pppoe_data_input(struct mbuf *m)
{
u_int8_t *p, vertype;
u_int16_t session, plen, code;
struct pppoe_softc *sc;
KASSERT(m->m_flags & M_PKTHDR);
m_adj(m, sizeof(struct ether_header));
if (m->m_pkthdr.len <= PPPOE_HEADERLEN) {
printf("pppoe (data): dropping too short packet: %ld bytes\n", (long)m->m_pkthdr.len);
goto drop;
}
p = mtod(m, u_int8_t*);
vertype = *p++;
if (vertype != PPPOE_VERTYPE) {
printf("pppoe (data): unknown version/type packet: 0x%x\n", vertype);
goto drop;
}
code = *p++;
if (code != 0)
goto drop;
PPPOE_READ_16(p, session);
sc = pppoe_find_softc_by_session(session, m->m_pkthdr.rcvif);
if (sc == NULL)
goto drop;
PPPOE_READ_16(p, plen);
#if NBPFILTER > 0
if(sc->sc_sppp.pp_if.if_bpf)
bpf_mtap(sc->sc_sppp.pp_if.if_bpf, m);
#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.rcvif = &sc->sc_sppp.pp_if;
/* pass packet up */
sppp_input(&sc->sc_sppp.pp_if, m);
return;
drop:
m_free(m);
}
static int
pppoe_output(struct pppoe_softc *sc, struct mbuf *m)
{
struct sockaddr dst;
struct ether_header *eh;
u_int16_t etype;
if (sc->sc_eth_if == NULL)
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
return sc->sc_eth_if->if_output(sc->sc_eth_if, m, &dst, NULL);
}
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;
int error = 0;
switch (cmd) {
case PPPOESETPARMS:
{
struct pppoediscparms *parms = (struct pppoediscparms*)data;
if ((error = suser(p->p_ucred, &p->p_acflag)) != 0)
return error;
if (parms->eth_ifname[0] != 0) {
sc->sc_eth_if = ifunit(parms->eth_ifname);
if (sc->sc_eth_if == NULL)
return ENXIO;
}
if (parms->ac_name) {
size_t s;
char * p = malloc(parms->ac_name_len + 1, M_DEVBUF, M_WAITOK);
copyinstr(parms->ac_name, p, parms->ac_name_len, &s);
if (sc->sc_concentrator_name)
free(sc->sc_concentrator_name, M_DEVBUF);
sc->sc_concentrator_name = p;
}
if (parms->service_name) {
size_t s;
char * p = malloc(parms->service_name_len + 1, M_DEVBUF, M_WAITOK);
copyinstr(parms->service_name, p, parms->service_name_len, &s);
if (sc->sc_service_name)
free(sc->sc_service_name, M_DEVBUF);
sc->sc_service_name = p;
}
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;
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) {
struct mbuf *n;
MFREE(m, n);
return 0;
}
}
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, l2;
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; /* 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;
}
/* allocate a buffer */
m0 = pppoe_get_mbuf(len+PPPOE_HEADERLEN); /* header len + payload len */
if (!m0) return ENOBUFS;
/* 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));
memcpy(p, &sc, sizeof sc);
#ifdef PPPOE_DEBUG
p += sizeof sc;
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);
}
static void
pppoe_timeout(void *arg)
{
int x;
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_PADI_SENT:
x = splnet();
sc->sc_padi_retried++;
if (sc->sc_padi_retried >= PPPOE_DISC_MAXPADI) {
pppoe_abort_connect(sc);
splx(x);
return;
}
if (pppoe_send_padi(sc) == 0)
callout_reset(&sc->sc_timeout, PPPOE_DISC_TIMEOUT*(1+sc->sc_padi_retried), pppoe_timeout, sc);
else
pppoe_abort_connect(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 (pppoe_send_padi(sc) == 0)
callout_reset(&sc->sc_timeout, PPPOE_DISC_TIMEOUT*(1+sc->sc_padi_retried), pppoe_timeout, sc);
else
pppoe_abort_connect(sc);
splx(x);
return;
}
if (pppoe_send_padr(sc) == 0)
callout_reset(&sc->sc_timeout, PPPOE_DISC_TIMEOUT*(1+sc->sc_padr_retried), pppoe_timeout, sc);
else
pppoe_abort_connect(sc);
splx(x);
break;
case PPPOE_STATE_CLOSING:
x = splnet();
pppoe_disconnect(sc);
splx(x);
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;
x = splnet();
sc->sc_state = PPPOE_STATE_PADI_SENT;
sc->sc_padr_retried = 0;
err = pppoe_send_padi(sc);
if (err == 0)
callout_reset(&sc->sc_timeout, PPPOE_DISC_TIMEOUT, pppoe_timeout, sc);
else
pppoe_abort_connect(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 {
printf("%s: disconnecting\n", sc->sc_sppp.pp_if.if_xname);
err = pppoe_send_padt(sc);
}
/* 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_MBUF);
sc->sc_ac_cookie = NULL;
}
sc->sc_ac_cookie_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_INITIAL;
memcpy(&sc->sc_dest, etherbroadcastaddr, sizeof(sc->sc_dest));
/* notify upper layer */
sc->sc_sppp.pp_down(&sc->sc_sppp);
}
/* Send a PADR packet */
static int
pppoe_send_padr(struct pppoe_softc *sc)
{
struct mbuf *m0;
u_int8_t *p;
size_t len, l1;
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 */
m0 = pppoe_get_mbuf(len+PPPOE_HEADERLEN);
if (!m0) return ENOBUFS;
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;
}
PPPOE_ADD_16(p, PPPOE_TAG_HUNIQUE);
PPPOE_ADD_16(p, sizeof(sc));
memcpy(p, &sc, sizeof sc);
#ifdef PPPOE_DEBUG
p += sizeof sc;
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(struct pppoe_softc *sc)
{
struct mbuf *m0;
u_int8_t *p;
if (sc->sc_state < PPPOE_STATE_SESSION)
return EIO;
#ifdef PPPOE_DEBUG
printf("%s: sending PADT\n", sc->sc_sppp.pp_if.if_xname);
#endif
m0 = pppoe_get_mbuf(PPPOE_HEADERLEN);
if (!m0) return ENOBUFS;
p = mtod(m0, u_int8_t*);
PPPOE_ADD_HEADER(p, PPPOE_CODE_PADT, sc->sc_session, 0);
return pppoe_output(sc, m0);
}
static void
pppoe_tls(struct sppp *sp)
{
struct pppoe_softc *sc = (void*)sp;
if (sc->sc_state != PPPOE_STATE_INITIAL)
return;
pppoe_connect(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/100, pppoe_timeout, sc);
}
static void
pppoe_start(struct ifnet *ifp)
{
struct pppoe_softc *sc = (void*)ifp;
struct mbuf *m;
u_int8_t *p;
size_t len;
if (sppp_isempty(ifp))
return;
/* are we read to proccess 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) {
m_free(m);
break;
}
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);
#endif
pppoe_output(sc, m);
}
}
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