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TP-Link_Archer-XR500v/EN7526G_3.18Kernel_SDK/apps/public/ppp-2.4.5/solaris/ppp.c
Matheus Sampaio Queiroga aaca98136a
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2024-07-22 01:58:46 -03:00

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/*
* ppp.c - STREAMS multiplexing pseudo-device driver for PPP.
*
* Copyright (c) 1994 Paul Mackerras. 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.
*
* 3. The name(s) of the authors of this software must not be used to
* endorse or promote products derived from this software without
* prior written permission.
*
* 4. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by Paul Mackerras
* <paulus@samba.org>".
*
* THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO
* THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
* SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
* AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* $Id: //BBN_Linux/Branch/Branch_for_Rel_TP_ASEAN_20161216/tclinux_phoenix/apps/public/ppp-2.4.5/solaris/ppp.c#1 $
*/
/*
* This file is used under Solaris 2, SVR4, SunOS 4, and Digital UNIX.
*/
#include <sys/types.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/stream.h>
#include <sys/stropts.h>
#include <sys/errno.h>
#ifdef __osf__
#include <sys/ioctl.h>
#include <sys/cmn_err.h>
#define queclass(mp) ((mp)->b_band & QPCTL)
#else
#include <sys/ioccom.h>
#endif
#include <sys/time.h>
#ifdef SVR4
#include <sys/cmn_err.h>
#include <sys/conf.h>
#include <sys/dlpi.h>
#include <sys/ddi.h>
#ifdef SOL2
#include <sys/ksynch.h>
#include <sys/kstat.h>
#include <sys/sunddi.h>
#include <sys/ethernet.h>
#else
#include <sys/socket.h>
#include <sys/sockio.h>
#include <net/if.h>
#include <netinet/in.h>
#endif /* SOL2 */
#else /* not SVR4 */
#include <sys/user.h>
#endif /* SVR4 */
#include <net/ppp_defs.h>
#include <net/pppio.h>
#include "ppp_mod.h"
/*
* Modifications marked with #ifdef PRIOQ are for priority queueing of
* interactive traffic, and are due to Marko Zec <zec@japa.tel.fer.hr>.
*/
#ifdef PRIOQ
#endif /* PRIOQ */
#include <netinet/in.h> /* leave this outside of PRIOQ for htons */
#ifdef __STDC__
#define __P(x) x
#else
#define __P(x) ()
#endif
/*
* The IP module may use this SAP value for IP packets.
*/
#ifndef ETHERTYPE_IP
#define ETHERTYPE_IP 0x800
#endif
#if !defined(ETHERTYPE_IPV6)
#define ETHERTYPE_IPV6 0x86dd
#endif /* !defined(ETHERTYPE_IPV6) */
#if !defined(ETHERTYPE_ALLSAP) && defined(SOL2)
#define ETHERTYPE_ALLSAP 0
#endif /* !defined(ETHERTYPE_ALLSAP) && defined(SOL2) */
#if !defined(PPP_ALLSAP) && defined(SOL2)
#define PPP_ALLSAP PPP_ALLSTATIONS
#endif /* !defined(PPP_ALLSAP) && defined(SOL2) */
extern time_t time;
#ifdef SOL2
/*
* We use this reader-writer lock to ensure that the lower streams
* stay connected to the upper streams while the lower-side put and
* service procedures are running. Essentially it is an existence
* lock for the upper stream associated with each lower stream.
*/
krwlock_t ppp_lower_lock;
#define LOCK_LOWER_W rw_enter(&ppp_lower_lock, RW_WRITER)
#define LOCK_LOWER_R rw_enter(&ppp_lower_lock, RW_READER)
#define TRYLOCK_LOWER_R rw_tryenter(&ppp_lower_lock, RW_READER)
#define UNLOCK_LOWER rw_exit(&ppp_lower_lock)
#define MT_ENTER(x) mutex_enter(x)
#define MT_EXIT(x) mutex_exit(x)
/*
* Notes on multithreaded implementation for Solaris 2:
*
* We use an inner perimeter around each queue pair and an outer
* perimeter around the whole driver. The inner perimeter is
* entered exclusively for all entry points (open, close, put,
* service). The outer perimeter is entered exclusively for open
* and close and shared for put and service. This is all done for
* us by the streams framework.
*
* I used to think that the perimeters were entered for the lower
* streams' put and service routines as well as for the upper streams'.
* Because of problems experienced by people, and after reading the
* documentation more closely, I now don't think that is true. So we
* now use ppp_lower_lock to give us an existence guarantee on the
* upper stream controlling each lower stream.
*
* Shared entry to the outer perimeter protects the existence of all
* the upper streams and their upperstr_t structures, and guarantees
* that the following fields of any upperstr_t won't change:
* nextmn, next, nextppa. It guarantees that the lowerq field of an
* upperstr_t won't go from non-zero to zero, that the global `ppas'
* won't change and that the no lower stream will get unlinked.
*
* Shared (reader) access to ppa_lower_lock guarantees that no lower
* stream will be unlinked and that the lowerq field of all upperstr_t
* structures won't change.
*/
#else /* SOL2 */
#define LOCK_LOWER_W 0
#define LOCK_LOWER_R 0
#define TRYLOCK_LOWER_R 1
#define UNLOCK_LOWER 0
#define MT_ENTER(x) 0
#define MT_EXIT(x) 0
#endif /* SOL2 */
/*
* Private information; one per upper stream.
*/
typedef struct upperstr {
minor_t mn; /* minor device number */
struct upperstr *nextmn; /* next minor device */
queue_t *q; /* read q associated with this upper stream */
int flags; /* flag bits, see below */
int state; /* current DLPI state */
int sap; /* service access point */
int req_sap; /* which SAP the DLPI client requested */
struct upperstr *ppa; /* control stream for our ppa */
struct upperstr *next; /* next stream for this ppa */
uint ioc_id; /* last ioctl ID for this stream */
enum NPmode npmode; /* what to do with packets on this SAP */
unsigned char rblocked; /* flow control has blocked upper read strm */
/* N.B. rblocked is only changed by control stream's put/srv procs */
/*
* There is exactly one control stream for each PPA.
* The following fields are only used for control streams.
*/
int ppa_id;
queue_t *lowerq; /* write queue attached below this PPA */
struct upperstr *nextppa; /* next control stream */
int mru;
int mtu;
struct pppstat stats; /* statistics */
time_t last_sent; /* time last NP packet sent */
time_t last_recv; /* time last NP packet rcvd */
#ifdef SOL2
kmutex_t stats_lock; /* lock for stats updates */
kstat_t *kstats; /* stats for netstat */
#endif /* SOL2 */
#ifdef LACHTCP
int ifflags;
char ifname[IFNAMSIZ];
struct ifstats ifstats;
#endif /* LACHTCP */
} upperstr_t;
/* Values for flags */
#define US_PRIV 1 /* stream was opened by superuser */
#define US_CONTROL 2 /* stream is a control stream */
#define US_BLOCKED 4 /* flow ctrl has blocked lower write stream */
#define US_LASTMOD 8 /* no PPP modules below us */
#define US_DBGLOG 0x10 /* log various occurrences */
#define US_RBLOCKED 0x20 /* flow ctrl has blocked upper read stream */
#if defined(SOL2)
#if DL_CURRENT_VERSION >= 2
#define US_PROMISC 0x40 /* stream is promiscuous */
#endif /* DL_CURRENT_VERSION >= 2 */
#define US_RAWDATA 0x80 /* raw M_DATA, no DLPI header */
#endif /* defined(SOL2) */
#ifdef PRIOQ
static u_char max_band=0;
static u_char def_band=0;
#define IPPORT_DEFAULT 65535
/*
* Port priority table
* Highest priority ports are listed first, lowest are listed last.
* ICMP & packets using unlisted ports will be treated as "default".
* If IPPORT_DEFAULT is not listed here, "default" packets will be
* assigned lowest priority.
* Each line should be terminated with "0".
* Line containing only "0" marks the end of the list.
*/
static u_short prioq_table[]= {
113, 53, 0,
22, 23, 513, 517, 518, 0,
514, 21, 79, 111, 0,
25, 109, 110, 0,
IPPORT_DEFAULT, 0,
20, 70, 80, 8001, 8008, 8080, 0, /* 8001,8008,8080 - common proxy ports */
0 };
#endif /* PRIOQ */
static upperstr_t *minor_devs = NULL;
static upperstr_t *ppas = NULL;
#ifdef SVR4
static int pppopen __P((queue_t *, dev_t *, int, int, cred_t *));
static int pppclose __P((queue_t *, int, cred_t *));
#else
static int pppopen __P((queue_t *, int, int, int));
static int pppclose __P((queue_t *, int));
#endif /* SVR4 */
static int pppurput __P((queue_t *, mblk_t *));
static int pppuwput __P((queue_t *, mblk_t *));
static int pppursrv __P((queue_t *));
static int pppuwsrv __P((queue_t *));
static int ppplrput __P((queue_t *, mblk_t *));
static int ppplwput __P((queue_t *, mblk_t *));
static int ppplrsrv __P((queue_t *));
static int ppplwsrv __P((queue_t *));
#ifndef NO_DLPI
static void dlpi_request __P((queue_t *, mblk_t *, upperstr_t *));
static void dlpi_error __P((queue_t *, upperstr_t *, int, int, int));
static void dlpi_ok __P((queue_t *, int));
#endif
static int send_data __P((mblk_t *, upperstr_t *));
static void new_ppa __P((queue_t *, mblk_t *));
static void attach_ppa __P((queue_t *, mblk_t *));
#ifndef NO_DLPI
static void detach_ppa __P((queue_t *, mblk_t *));
#endif
static void detach_lower __P((queue_t *, mblk_t *));
static void debug_dump __P((queue_t *, mblk_t *));
static upperstr_t *find_dest __P((upperstr_t *, int));
#if defined(SOL2)
static upperstr_t *find_promisc __P((upperstr_t *, int));
static mblk_t *prepend_ether __P((upperstr_t *, mblk_t *, int));
static mblk_t *prepend_udind __P((upperstr_t *, mblk_t *, int));
static void promisc_sendup __P((upperstr_t *, mblk_t *, int, int));
#endif /* defined(SOL2) */
static int putctl2 __P((queue_t *, int, int, int));
static int putctl4 __P((queue_t *, int, int, int));
static int pass_packet __P((upperstr_t *ppa, mblk_t *mp, int outbound));
#ifdef FILTER_PACKETS
static int ip_hard_filter __P((upperstr_t *ppa, mblk_t *mp, int outbound));
#endif /* FILTER_PACKETS */
#define PPP_ID 0xb1a6
static struct module_info ppp_info = {
#ifdef PRIOQ
PPP_ID, "ppp", 0, 512, 512, 384
#else
PPP_ID, "ppp", 0, 512, 512, 128
#endif /* PRIOQ */
};
static struct qinit pppurint = {
pppurput, pppursrv, pppopen, pppclose, NULL, &ppp_info, NULL
};
static struct qinit pppuwint = {
pppuwput, pppuwsrv, NULL, NULL, NULL, &ppp_info, NULL
};
static struct qinit ppplrint = {
ppplrput, ppplrsrv, NULL, NULL, NULL, &ppp_info, NULL
};
static struct qinit ppplwint = {
ppplwput, ppplwsrv, NULL, NULL, NULL, &ppp_info, NULL
};
#ifdef LACHTCP
extern struct ifstats *ifstats;
int pppdevflag = 0;
#endif
struct streamtab pppinfo = {
&pppurint, &pppuwint,
&ppplrint, &ppplwint
};
int ppp_count;
/*
* How we maintain statistics.
*/
#ifdef SOL2
#define INCR_IPACKETS(ppa) \
if (ppa->kstats != 0) { \
KSTAT_NAMED_PTR(ppa->kstats)[0].value.ul++; \
}
#define INCR_IERRORS(ppa) \
if (ppa->kstats != 0) { \
KSTAT_NAMED_PTR(ppa->kstats)[1].value.ul++; \
}
#define INCR_OPACKETS(ppa) \
if (ppa->kstats != 0) { \
KSTAT_NAMED_PTR(ppa->kstats)[2].value.ul++; \
}
#define INCR_OERRORS(ppa) \
if (ppa->kstats != 0) { \
KSTAT_NAMED_PTR(ppa->kstats)[3].value.ul++; \
}
#endif
#ifdef LACHTCP
#define INCR_IPACKETS(ppa) ppa->ifstats.ifs_ipackets++;
#define INCR_IERRORS(ppa) ppa->ifstats.ifs_ierrors++;
#define INCR_OPACKETS(ppa) ppa->ifstats.ifs_opackets++;
#define INCR_OERRORS(ppa) ppa->ifstats.ifs_oerrors++;
#endif
/*
* STREAMS driver entry points.
*/
static int
#ifdef SVR4
pppopen(q, devp, oflag, sflag, credp)
queue_t *q;
dev_t *devp;
int oflag, sflag;
cred_t *credp;
#else
pppopen(q, dev, oflag, sflag)
queue_t *q;
int dev; /* really dev_t */
int oflag, sflag;
#endif
{
upperstr_t *up;
upperstr_t **prevp;
minor_t mn;
#ifdef PRIOQ
u_short *ptr;
u_char new_band;
#endif /* PRIOQ */
if (q->q_ptr)
DRV_OPEN_OK(dev); /* device is already open */
#ifdef PRIOQ
/* Calculate max_bband & def_band from definitions in prioq.h
This colud be done at some more approtiate time (less often)
but this way it works well so I'll just leave it here */
max_band = 1;
def_band = 0;
ptr = prioq_table;
while (*ptr) {
new_band = 1;
while (*ptr)
if (*ptr++ == IPPORT_DEFAULT) {
new_band = 0;
def_band = max_band;
}
max_band += new_band;
ptr++;
}
if (def_band)
def_band = max_band - def_band;
--max_band;
#endif /* PRIOQ */
if (sflag == CLONEOPEN) {
mn = 0;
for (prevp = &minor_devs; (up = *prevp) != 0; prevp = &up->nextmn) {
if (up->mn != mn)
break;
++mn;
}
} else {
#ifdef SVR4
mn = getminor(*devp);
#else
mn = minor(dev);
#endif
for (prevp = &minor_devs; (up = *prevp) != 0; prevp = &up->nextmn) {
if (up->mn >= mn)
break;
}
if (up->mn == mn) {
/* this can't happen */
q->q_ptr = WR(q)->q_ptr = (caddr_t) up;
DRV_OPEN_OK(dev);
}
}
/*
* Construct a new minor node.
*/
up = (upperstr_t *) ALLOC_SLEEP(sizeof(upperstr_t));
bzero((caddr_t) up, sizeof(upperstr_t));
if (up == 0) {
DPRINT("pppopen: out of kernel memory\n");
OPEN_ERROR(ENXIO);
}
up->nextmn = *prevp;
*prevp = up;
up->mn = mn;
#ifdef SVR4
*devp = makedevice(getmajor(*devp), mn);
#endif
up->q = q;
if (NOTSUSER() == 0)
up->flags |= US_PRIV;
#ifndef NO_DLPI
up->state = DL_UNATTACHED;
#endif
#ifdef LACHTCP
up->ifflags = IFF_UP | IFF_POINTOPOINT;
#endif
up->sap = -1;
up->last_sent = up->last_recv = time;
up->npmode = NPMODE_DROP;
q->q_ptr = (caddr_t) up;
WR(q)->q_ptr = (caddr_t) up;
noenable(WR(q));
#ifdef SOL2
mutex_init(&up->stats_lock, NULL, MUTEX_DRIVER, NULL);
#endif
++ppp_count;
qprocson(q);
DRV_OPEN_OK(makedev(major(dev), mn));
}
static int
#ifdef SVR4
pppclose(q, flag, credp)
queue_t *q;
int flag;
cred_t *credp;
#else
pppclose(q, flag)
queue_t *q;
int flag;
#endif
{
upperstr_t *up, **upp;
upperstr_t *as, *asnext;
upperstr_t **prevp;
qprocsoff(q);
up = (upperstr_t *) q->q_ptr;
if (up == 0) {
DPRINT("pppclose: q_ptr = 0\n");
return 0;
}
if (up->flags & US_DBGLOG)
DPRINT2("ppp/%d: close, flags=%x\n", up->mn, up->flags);
if (up->flags & US_CONTROL) {
#ifdef LACHTCP
struct ifstats *ifp, *pifp;
#endif
if (up->lowerq != 0) {
/* Gack! the lower stream should have be unlinked earlier! */
DPRINT1("ppp%d: lower stream still connected on close?\n",
up->mn);
LOCK_LOWER_W;
up->lowerq->q_ptr = 0;
RD(up->lowerq)->q_ptr = 0;
up->lowerq = 0;
UNLOCK_LOWER;
}
/*
* This stream represents a PPA:
* For all streams attached to the PPA, clear their
* references to this PPA.
* Then remove this PPA from the list of PPAs.
*/
for (as = up->next; as != 0; as = asnext) {
asnext = as->next;
as->next = 0;
as->ppa = 0;
if (as->flags & US_BLOCKED) {
as->flags &= ~US_BLOCKED;
flushq(WR(as->q), FLUSHDATA);
}
}
for (upp = &ppas; *upp != 0; upp = &(*upp)->nextppa)
if (*upp == up) {
*upp = up->nextppa;
break;
}
#ifdef LACHTCP
/* Remove the statistics from the active list. */
for (ifp = ifstats, pifp = 0; ifp; ifp = ifp->ifs_next) {
if (ifp == &up->ifstats) {
if (pifp)
pifp->ifs_next = ifp->ifs_next;
else
ifstats = ifp->ifs_next;
break;
}
pifp = ifp;
}
#endif
} else {
/*
* If this stream is attached to a PPA,
* remove it from the PPA's list.
*/
if ((as = up->ppa) != 0) {
for (; as->next != 0; as = as->next)
if (as->next == up) {
as->next = up->next;
break;
}
}
}
#ifdef SOL2
if (up->kstats)
kstat_delete(up->kstats);
mutex_destroy(&up->stats_lock);
#endif
q->q_ptr = NULL;
WR(q)->q_ptr = NULL;
for (prevp = &minor_devs; *prevp != 0; prevp = &(*prevp)->nextmn) {
if (*prevp == up) {
*prevp = up->nextmn;
break;
}
}
FREE(up, sizeof(upperstr_t));
--ppp_count;
return 0;
}
/*
* A message from on high. We do one of three things:
* - qreply()
* - put the message on the lower write stream
* - queue it for our service routine
*/
static int
pppuwput(q, mp)
queue_t *q;
mblk_t *mp;
{
upperstr_t *us, *ppa, *nps;
struct iocblk *iop;
struct linkblk *lb;
#ifdef LACHTCP
struct ifreq *ifr;
int i;
#endif
queue_t *lq;
int error, n, sap;
mblk_t *mq;
struct ppp_idle *pip;
#ifdef PRIOQ
queue_t *tlq;
#endif /* PRIOQ */
#ifdef NO_DLPI
upperstr_t *os;
#endif
us = (upperstr_t *) q->q_ptr;
if (us == 0) {
DPRINT("pppuwput: q_ptr = 0!\n");
return 0;
}
if (mp == 0) {
DPRINT1("pppuwput/%d: mp = 0!\n", us->mn);
return 0;
}
if (mp->b_datap == 0) {
DPRINT1("pppuwput/%d: mp->b_datap = 0!\n", us->mn);
return 0;
}
switch (mp->b_datap->db_type) {
#ifndef NO_DLPI
case M_PCPROTO:
case M_PROTO:
dlpi_request(q, mp, us);
break;
#endif /* NO_DLPI */
case M_DATA:
if (us->flags & US_DBGLOG)
DPRINT3("ppp/%d: uwput M_DATA len=%d flags=%x\n",
us->mn, msgdsize(mp), us->flags);
if (us->ppa == 0 || msgdsize(mp) > us->ppa->mtu + PPP_HDRLEN
#ifndef NO_DLPI
|| (us->flags & US_CONTROL) == 0
#endif /* NO_DLPI */
) {
DPRINT1("pppuwput: junk data len=%d\n", msgdsize(mp));
freemsg(mp);
break;
}
#ifdef NO_DLPI
/* pass_packet frees the packet on returning 0 */
if ((us->flags & US_CONTROL) == 0 && !pass_packet(us, mp, 1))
break;
#endif
if (!send_data(mp, us) && !putq(q, mp))
freemsg(mp);
break;
case M_IOCTL:
iop = (struct iocblk *) mp->b_rptr;
error = EINVAL;
if (us->flags & US_DBGLOG)
DPRINT3("ppp/%d: ioctl %x count=%d\n",
us->mn, iop->ioc_cmd, iop->ioc_count);
switch (iop->ioc_cmd) {
#if defined(SOL2)
case DLIOCRAW: /* raw M_DATA mode */
us->flags |= US_RAWDATA;
error = 0;
break;
#endif /* defined(SOL2) */
case I_LINK:
if ((us->flags & US_CONTROL) == 0 || us->lowerq != 0)
break;
if (mp->b_cont == 0) {
DPRINT1("pppuwput/%d: ioctl I_LINK b_cont = 0!\n", us->mn);
break;
}
lb = (struct linkblk *) mp->b_cont->b_rptr;
lq = lb->l_qbot;
if (lq == 0) {
DPRINT1("pppuwput/%d: ioctl I_LINK l_qbot = 0!\n", us->mn);
break;
}
LOCK_LOWER_W;
us->lowerq = lq;
lq->q_ptr = (caddr_t) q;
RD(lq)->q_ptr = (caddr_t) us->q;
UNLOCK_LOWER;
iop->ioc_count = 0;
error = 0;
us->flags &= ~US_LASTMOD;
/* Unblock upper streams which now feed this lower stream. */
qenable(q);
/* Send useful information down to the modules which
are now linked below us. */
putctl2(lq, M_CTL, PPPCTL_UNIT, us->ppa_id);
putctl4(lq, M_CTL, PPPCTL_MRU, us->mru);
putctl4(lq, M_CTL, PPPCTL_MTU, us->mtu);
#ifdef PRIOQ
/* Lower tty driver's queue hiwat/lowat from default 4096/128
to 256/128 since we don't want queueing of data on
output to physical device */
freezestr(lq);
for (tlq = lq; tlq->q_next != NULL; tlq = tlq->q_next)
;
strqset(tlq, QHIWAT, 0, 256);
strqset(tlq, QLOWAT, 0, 128);
unfreezestr(lq);
#endif /* PRIOQ */
break;
case I_UNLINK:
if (mp->b_cont == 0) {
DPRINT1("pppuwput/%d: ioctl I_UNLINK b_cont = 0!\n", us->mn);
break;
}
lb = (struct linkblk *) mp->b_cont->b_rptr;
#if DEBUG
if (us->lowerq != lb->l_qbot) {
DPRINT2("ppp unlink: lowerq=%x qbot=%x\n",
us->lowerq, lb->l_qbot);
break;
}
#endif
iop->ioc_count = 0;
qwriter(q, mp, detach_lower, PERIM_OUTER);
/* mp is now gone */
error = -1;
break;
case PPPIO_NEWPPA:
if (us->flags & US_CONTROL)
break;
if ((us->flags & US_PRIV) == 0) {
error = EPERM;
break;
}
/* Arrange to return an int */
if ((mq = mp->b_cont) == 0
|| mq->b_datap->db_lim - mq->b_rptr < sizeof(int)) {
mq = allocb(sizeof(int), BPRI_HI);
if (mq == 0) {
error = ENOSR;
break;
}
if (mp->b_cont != 0)
freemsg(mp->b_cont);
mp->b_cont = mq;
mq->b_cont = 0;
}
iop->ioc_count = sizeof(int);
mq->b_wptr = mq->b_rptr + sizeof(int);
qwriter(q, mp, new_ppa, PERIM_OUTER);
/* mp is now gone */
error = -1;
break;
case PPPIO_ATTACH:
/* like dlpi_attach, for programs which can't write to
the stream (like pppstats) */
if (iop->ioc_count != sizeof(int) || us->ppa != 0)
break;
if (mp->b_cont == 0) {
DPRINT1("pppuwput/%d: ioctl PPPIO_ATTACH b_cont = 0!\n", us->mn);
break;
}
n = *(int *)mp->b_cont->b_rptr;
for (ppa = ppas; ppa != 0; ppa = ppa->nextppa)
if (ppa->ppa_id == n)
break;
if (ppa == 0)
break;
us->ppa = ppa;
iop->ioc_count = 0;
qwriter(q, mp, attach_ppa, PERIM_OUTER);
/* mp is now gone */
error = -1;
break;
#ifdef NO_DLPI
case PPPIO_BIND:
/* Attach to a given SAP. */
if (iop->ioc_count != sizeof(int) || us->ppa == 0)
break;
if (mp->b_cont == 0) {
DPRINT1("pppuwput/%d: ioctl PPPIO_BIND b_cont = 0!\n", us->mn);
break;
}
n = *(int *)mp->b_cont->b_rptr;
/* n must be a valid PPP network protocol number. */
if (n < 0x21 || n > 0x3fff || (n & 0x101) != 1)
break;
/* check that no other stream is bound to this sap already. */
for (os = us->ppa; os != 0; os = os->next)
if (os->sap == n)
break;
if (os != 0)
break;
us->sap = n;
iop->ioc_count = 0;
error = 0;
break;
#endif /* NO_DLPI */
case PPPIO_MRU:
if (iop->ioc_count != sizeof(int) || (us->flags & US_CONTROL) == 0)
break;
if (mp->b_cont == 0) {
DPRINT1("pppuwput/%d: ioctl PPPIO_MRU b_cont = 0!\n", us->mn);
break;
}
n = *(int *)mp->b_cont->b_rptr;
if (n <= 0 || n > PPP_MAXMRU)
break;
if (n < PPP_MRU)
n = PPP_MRU;
us->mru = n;
if (us->lowerq)
putctl4(us->lowerq, M_CTL, PPPCTL_MRU, n);
error = 0;
iop->ioc_count = 0;
break;
case PPPIO_MTU:
if (iop->ioc_count != sizeof(int) || (us->flags & US_CONTROL) == 0)
break;
if (mp->b_cont == 0) {
DPRINT1("pppuwput/%d: ioctl PPPIO_MTU b_cont = 0!\n", us->mn);
break;
}
n = *(int *)mp->b_cont->b_rptr;
if (n <= 0 || n > PPP_MAXMTU)
break;
us->mtu = n;
#ifdef LACHTCP
/* The MTU reported in netstat, not used as IP max packet size! */
us->ifstats.ifs_mtu = n;
#endif
if (us->lowerq)
putctl4(us->lowerq, M_CTL, PPPCTL_MTU, n);
error = 0;
iop->ioc_count = 0;
break;
case PPPIO_LASTMOD:
us->flags |= US_LASTMOD;
error = 0;
break;
case PPPIO_DEBUG:
if (iop->ioc_count != sizeof(int))
break;
if (mp->b_cont == 0) {
DPRINT1("pppuwput/%d: ioctl PPPIO_DEBUG b_cont = 0!\n", us->mn);
break;
}
n = *(int *)mp->b_cont->b_rptr;
if (n == PPPDBG_DUMP + PPPDBG_DRIVER) {
qwriter(q, mp, debug_dump, PERIM_OUTER);
/* mp is now gone */
error = -1;
} else if (n == PPPDBG_LOG + PPPDBG_DRIVER) {
DPRINT1("ppp/%d: debug log enabled\n", us->mn);
us->flags |= US_DBGLOG;
iop->ioc_count = 0;
error = 0;
} else {
if (us->ppa == 0 || us->ppa->lowerq == 0)
break;
putnext(us->ppa->lowerq, mp);
/* mp is now gone */
error = -1;
}
break;
case PPPIO_NPMODE:
if (iop->ioc_count != 2 * sizeof(int))
break;
if ((us->flags & US_CONTROL) == 0)
break;
if (mp->b_cont == 0) {
DPRINT1("pppuwput/%d: ioctl PPPIO_NPMODE b_cont = 0!\n", us->mn);
break;
}
sap = ((int *)mp->b_cont->b_rptr)[0];
for (nps = us->next; nps != 0; nps = nps->next) {
if (us->flags & US_DBGLOG)
DPRINT2("us = 0x%x, us->next->sap = 0x%x\n", nps, nps->sap);
if (nps->sap == sap)
break;
}
if (nps == 0) {
if (us->flags & US_DBGLOG)
DPRINT2("ppp/%d: no stream for sap %x\n", us->mn, sap);
break;
}
/* XXX possibly should use qwriter here */
nps->npmode = (enum NPmode) ((int *)mp->b_cont->b_rptr)[1];
if (nps->npmode != NPMODE_QUEUE && (nps->flags & US_BLOCKED) != 0)
qenable(WR(nps->q));
iop->ioc_count = 0;
error = 0;
break;
case PPPIO_GIDLE:
if ((ppa = us->ppa) == 0)
break;
mq = allocb(sizeof(struct ppp_idle), BPRI_HI);
if (mq == 0) {
error = ENOSR;
break;
}
if (mp->b_cont != 0)
freemsg(mp->b_cont);
mp->b_cont = mq;
mq->b_cont = 0;
pip = (struct ppp_idle *) mq->b_wptr;
pip->xmit_idle = time - ppa->last_sent;
pip->recv_idle = time - ppa->last_recv;
mq->b_wptr += sizeof(struct ppp_idle);
iop->ioc_count = sizeof(struct ppp_idle);
error = 0;
break;
#ifdef LACHTCP
case SIOCSIFNAME:
/* Sent from IP down to us. Attach the ifstats structure. */
if (iop->ioc_count != sizeof(struct ifreq) || us->ppa == 0)
break;
ifr = (struct ifreq *)mp->b_cont->b_rptr;
/* Find the unit number in the interface name. */
for (i = 0; i < IFNAMSIZ; i++) {
if (ifr->ifr_name[i] == 0 ||
(ifr->ifr_name[i] >= '0' &&
ifr->ifr_name[i] <= '9'))
break;
else
us->ifname[i] = ifr->ifr_name[i];
}
us->ifname[i] = 0;
/* Convert the unit number to binary. */
for (n = 0; i < IFNAMSIZ; i++) {
if (ifr->ifr_name[i] == 0) {
break;
}
else {
n = n * 10 + ifr->ifr_name[i] - '0';
}
}
/* Verify the ppa. */
if (us->ppa->ppa_id != n)
break;
ppa = us->ppa;
/* Set up the netstat block. */
strncpy (ppa->ifname, us->ifname, IFNAMSIZ);
ppa->ifstats.ifs_name = ppa->ifname;
ppa->ifstats.ifs_unit = n;
ppa->ifstats.ifs_active = us->state != DL_UNBOUND;
ppa->ifstats.ifs_mtu = ppa->mtu;
/* Link in statistics used by netstat. */
ppa->ifstats.ifs_next = ifstats;
ifstats = &ppa->ifstats;
iop->ioc_count = 0;
error = 0;
break;
case SIOCGIFFLAGS:
if (!(us->flags & US_CONTROL)) {
if (us->ppa)
us = us->ppa;
else
break;
}
((struct iocblk_in *)iop)->ioc_ifflags = us->ifflags;
error = 0;
break;
case SIOCSIFFLAGS:
if (!(us->flags & US_CONTROL)) {
if (us->ppa)
us = us->ppa;
else
break;
}
us->ifflags = ((struct iocblk_in *)iop)->ioc_ifflags;
error = 0;
break;
case SIOCSIFADDR:
if (!(us->flags & US_CONTROL)) {
if (us->ppa)
us = us->ppa;
else
break;
}
us->ifflags |= IFF_RUNNING;
((struct iocblk_in *)iop)->ioc_ifflags |= IFF_RUNNING;
error = 0;
break;
case SIOCSIFMTU:
/*
* Vanilla SVR4 systems don't handle SIOCSIFMTU, rather
* they take the MTU from the DL_INFO_ACK we sent in response
* to their DL_INFO_REQ. Fortunately, they will update the
* MTU if we send an unsolicited DL_INFO_ACK up.
*/
if ((mq = allocb(sizeof(dl_info_req_t), BPRI_HI)) == 0)
break; /* should do bufcall */
((union DL_primitives *)mq->b_rptr)->dl_primitive = DL_INFO_REQ;
mq->b_wptr = mq->b_rptr + sizeof(dl_info_req_t);
dlpi_request(q, mq, us);
/* mp is now gone */
error = -1;
break;
case SIOCGIFNETMASK:
case SIOCSIFNETMASK:
case SIOCGIFADDR:
case SIOCGIFDSTADDR:
case SIOCSIFDSTADDR:
case SIOCGIFMETRIC:
error = 0;
break;
#endif /* LACHTCP */
default:
if (us->ppa == 0 || us->ppa->lowerq == 0)
break;
us->ioc_id = iop->ioc_id;
error = -1;
switch (iop->ioc_cmd) {
case PPPIO_GETSTAT:
case PPPIO_GETCSTAT:
if (us->flags & US_LASTMOD) {
error = EINVAL;
break;
}
putnext(us->ppa->lowerq, mp);
break;
default:
if (us->flags & US_PRIV)
putnext(us->ppa->lowerq, mp);
else {
DPRINT1("ppp ioctl %x rejected\n", iop->ioc_cmd);
error = EPERM;
}
break;
}
break;
}
if (error > 0) {
iop->ioc_error = error;
mp->b_datap->db_type = M_IOCNAK;
qreply(q, mp);
} else if (error == 0) {
mp->b_datap->db_type = M_IOCACK;
qreply(q, mp);
}
break;
case M_FLUSH:
if (us->flags & US_DBGLOG)
DPRINT2("ppp/%d: flush %x\n", us->mn, *mp->b_rptr);
if (*mp->b_rptr & FLUSHW)
flushq(q, FLUSHDATA);
if (*mp->b_rptr & FLUSHR) {
*mp->b_rptr &= ~FLUSHW;
qreply(q, mp);
} else
freemsg(mp);
break;
default:
freemsg(mp);
break;
}
return 0;
}
#ifndef NO_DLPI
static void
dlpi_request(q, mp, us)
queue_t *q;
mblk_t *mp;
upperstr_t *us;
{
union DL_primitives *d = (union DL_primitives *) mp->b_rptr;
int size = mp->b_wptr - mp->b_rptr;
mblk_t *reply, *np;
upperstr_t *ppa, *os;
int sap, len;
dl_info_ack_t *info;
dl_bind_ack_t *ackp;
#if DL_CURRENT_VERSION >= 2
dl_phys_addr_ack_t *paddrack;
static struct ether_addr eaddr = {0};
#endif
if (us->flags & US_DBGLOG)
DPRINT3("ppp/%d: dlpi prim %x len=%d\n", us->mn,
d->dl_primitive, size);
switch (d->dl_primitive) {
case DL_INFO_REQ:
if (size < sizeof(dl_info_req_t))
goto badprim;
if ((reply = allocb(sizeof(dl_info_ack_t), BPRI_HI)) == 0)
break; /* should do bufcall */
reply->b_datap->db_type = M_PCPROTO;
info = (dl_info_ack_t *) reply->b_wptr;
reply->b_wptr += sizeof(dl_info_ack_t);
bzero((caddr_t) info, sizeof(dl_info_ack_t));
info->dl_primitive = DL_INFO_ACK;
info->dl_max_sdu = us->ppa? us->ppa->mtu: PPP_MAXMTU;
info->dl_min_sdu = 1;
info->dl_addr_length = sizeof(uint);
info->dl_mac_type = DL_ETHER; /* a bigger lie */
info->dl_current_state = us->state;
info->dl_service_mode = DL_CLDLS;
info->dl_provider_style = DL_STYLE2;
#if DL_CURRENT_VERSION >= 2
info->dl_sap_length = sizeof(uint);
info->dl_version = DL_CURRENT_VERSION;
#endif
qreply(q, reply);
break;
case DL_ATTACH_REQ:
if (size < sizeof(dl_attach_req_t))
goto badprim;
if (us->state != DL_UNATTACHED || us->ppa != 0) {
dlpi_error(q, us, DL_ATTACH_REQ, DL_OUTSTATE, 0);
break;
}
for (ppa = ppas; ppa != 0; ppa = ppa->nextppa)
if (ppa->ppa_id == d->attach_req.dl_ppa)
break;
if (ppa == 0) {
dlpi_error(q, us, DL_ATTACH_REQ, DL_BADPPA, 0);
break;
}
us->ppa = ppa;
qwriter(q, mp, attach_ppa, PERIM_OUTER);
return;
case DL_DETACH_REQ:
if (size < sizeof(dl_detach_req_t))
goto badprim;
if (us->state != DL_UNBOUND || us->ppa == 0) {
dlpi_error(q, us, DL_DETACH_REQ, DL_OUTSTATE, 0);
break;
}
qwriter(q, mp, detach_ppa, PERIM_OUTER);
return;
case DL_BIND_REQ:
if (size < sizeof(dl_bind_req_t))
goto badprim;
if (us->state != DL_UNBOUND || us->ppa == 0) {
dlpi_error(q, us, DL_BIND_REQ, DL_OUTSTATE, 0);
break;
}
#if 0
/* apparently this test fails (unnecessarily?) on some systems */
if (d->bind_req.dl_service_mode != DL_CLDLS) {
dlpi_error(q, us, DL_BIND_REQ, DL_UNSUPPORTED, 0);
break;
}
#endif
/* saps must be valid PPP network protocol numbers,
except that we accept ETHERTYPE_IP in place of PPP_IP. */
sap = d->bind_req.dl_sap;
us->req_sap = sap;
#if defined(SOL2)
if (us->flags & US_DBGLOG)
DPRINT2("DL_BIND_REQ: ip gives sap = 0x%x, us = 0x%x", sap, us);
if (sap == ETHERTYPE_IP) /* normal IFF_IPV4 */
sap = PPP_IP;
else if (sap == ETHERTYPE_IPV6) /* when IFF_IPV6 is set */
sap = PPP_IPV6;
else if (sap == ETHERTYPE_ALLSAP) /* snoop gives sap of 0 */
sap = PPP_ALLSAP;
else {
DPRINT2("DL_BIND_REQ: unrecognized sap = 0x%x, us = 0x%x", sap, us);
dlpi_error(q, us, DL_BIND_REQ, DL_BADADDR, 0);
break;
}
#else
if (sap == ETHERTYPE_IP)
sap = PPP_IP;
if (sap < 0x21 || sap > 0x3fff || (sap & 0x101) != 1) {
dlpi_error(q, us, DL_BIND_REQ, DL_BADADDR, 0);
break;
}
#endif /* defined(SOL2) */
/* check that no other stream is bound to this sap already. */
for (os = us->ppa; os != 0; os = os->next)
if (os->sap == sap)
break;
if (os != 0) {
dlpi_error(q, us, DL_BIND_REQ, DL_NOADDR, 0);
break;
}
us->sap = sap;
us->state = DL_IDLE;
if ((reply = allocb(sizeof(dl_bind_ack_t) + sizeof(uint),
BPRI_HI)) == 0)
break; /* should do bufcall */
ackp = (dl_bind_ack_t *) reply->b_wptr;
reply->b_wptr += sizeof(dl_bind_ack_t) + sizeof(uint);
reply->b_datap->db_type = M_PCPROTO;
bzero((caddr_t) ackp, sizeof(dl_bind_ack_t));
ackp->dl_primitive = DL_BIND_ACK;
ackp->dl_sap = sap;
ackp->dl_addr_length = sizeof(uint);
ackp->dl_addr_offset = sizeof(dl_bind_ack_t);
*(uint *)(ackp+1) = sap;
qreply(q, reply);
break;
case DL_UNBIND_REQ:
if (size < sizeof(dl_unbind_req_t))
goto badprim;
if (us->state != DL_IDLE) {
dlpi_error(q, us, DL_UNBIND_REQ, DL_OUTSTATE, 0);
break;
}
us->sap = -1;
us->state = DL_UNBOUND;
#ifdef LACHTCP
us->ppa->ifstats.ifs_active = 0;
#endif
dlpi_ok(q, DL_UNBIND_REQ);
break;
case DL_UNITDATA_REQ:
if (size < sizeof(dl_unitdata_req_t))
goto badprim;
if (us->state != DL_IDLE) {
dlpi_error(q, us, DL_UNITDATA_REQ, DL_OUTSTATE, 0);
break;
}
if ((ppa = us->ppa) == 0) {
cmn_err(CE_CONT, "ppp: in state dl_idle but ppa == 0?\n");
break;
}
len = mp->b_cont == 0? 0: msgdsize(mp->b_cont);
if (len > ppa->mtu) {
DPRINT2("dlpi data too large (%d > %d)\n", len, ppa->mtu);
break;
}
#if defined(SOL2)
/*
* Should there be any promiscuous stream(s), send the data
* up for each promiscuous stream that we recognize.
*/
if (mp->b_cont)
promisc_sendup(ppa, mp->b_cont, us->sap, 0);
#endif /* defined(SOL2) */
mp->b_band = 0;
#ifdef PRIOQ
/* Extract s_port & d_port from IP-packet, the code is a bit
dirty here, but so am I, too... */
if (mp->b_datap->db_type == M_PROTO && us->sap == PPP_IP
&& mp->b_cont != 0) {
u_char *bb, *tlh;
int iphlen, len;
u_short *ptr;
u_char band_unset, cur_band, syn;
u_short s_port, d_port;
bb = mp->b_cont->b_rptr; /* bb points to IP-header*/
len = mp->b_cont->b_wptr - mp->b_cont->b_rptr;
syn = 0;
s_port = IPPORT_DEFAULT;
d_port = IPPORT_DEFAULT;
if (len >= 20) { /* 20 = minimum length of IP header */
iphlen = (bb[0] & 0x0f) * 4;
tlh = bb + iphlen;
len -= iphlen;
switch (bb[9]) {
case IPPROTO_TCP:
if (len >= 20) { /* min length of TCP header */
s_port = (tlh[0] << 8) + tlh[1];
d_port = (tlh[2] << 8) + tlh[3];
syn = tlh[13] & 0x02;
}
break;
case IPPROTO_UDP:
if (len >= 8) { /* min length of UDP header */
s_port = (tlh[0] << 8) + tlh[1];
d_port = (tlh[2] << 8) + tlh[3];
}
break;
}
}
/*
* Now calculate b_band for this packet from the
* port-priority table.
*/
ptr = prioq_table;
cur_band = max_band;
band_unset = 1;
while (*ptr) {
while (*ptr && band_unset)
if (s_port == *ptr || d_port == *ptr++) {
mp->b_band = cur_band;
band_unset = 0;
break;
}
ptr++;
cur_band--;
}
if (band_unset)
mp->b_band = def_band;
/* It may be usable to urge SYN packets a bit */
if (syn)
mp->b_band++;
}
#endif /* PRIOQ */
/* this assumes PPP_HDRLEN <= sizeof(dl_unitdata_req_t) */
if (mp->b_datap->db_ref > 1) {
np = allocb(PPP_HDRLEN, BPRI_HI);
if (np == 0)
break; /* gak! */
np->b_cont = mp->b_cont;
mp->b_cont = 0;
freeb(mp);
mp = np;
} else
mp->b_datap->db_type = M_DATA;
/* XXX should use dl_dest_addr_offset/length here,
but we would have to translate ETHERTYPE_IP -> PPP_IP */
mp->b_wptr = mp->b_rptr + PPP_HDRLEN;
mp->b_rptr[0] = PPP_ALLSTATIONS;
mp->b_rptr[1] = PPP_UI;
mp->b_rptr[2] = us->sap >> 8;
mp->b_rptr[3] = us->sap;
/* pass_packet frees the packet on returning 0 */
if (pass_packet(us, mp, 1)) {
if (!send_data(mp, us) && !putq(q, mp))
freemsg(mp);
}
return;
#if DL_CURRENT_VERSION >= 2
case DL_PHYS_ADDR_REQ:
if (size < sizeof(dl_phys_addr_req_t))
goto badprim;
/*
* Don't check state because ifconfig sends this one down too
*/
if ((reply = allocb(sizeof(dl_phys_addr_ack_t)+ETHERADDRL,
BPRI_HI)) == 0)
break; /* should do bufcall */
reply->b_datap->db_type = M_PCPROTO;
paddrack = (dl_phys_addr_ack_t *) reply->b_wptr;
reply->b_wptr += sizeof(dl_phys_addr_ack_t);
bzero((caddr_t) paddrack, sizeof(dl_phys_addr_ack_t)+ETHERADDRL);
paddrack->dl_primitive = DL_PHYS_ADDR_ACK;
paddrack->dl_addr_length = ETHERADDRL;
paddrack->dl_addr_offset = sizeof(dl_phys_addr_ack_t);
bcopy(&eaddr, reply->b_wptr, ETHERADDRL);
reply->b_wptr += ETHERADDRL;
qreply(q, reply);
break;
#if defined(SOL2)
case DL_PROMISCON_REQ:
if (size < sizeof(dl_promiscon_req_t))
goto badprim;
us->flags |= US_PROMISC;
dlpi_ok(q, DL_PROMISCON_REQ);
break;
case DL_PROMISCOFF_REQ:
if (size < sizeof(dl_promiscoff_req_t))
goto badprim;
us->flags &= ~US_PROMISC;
dlpi_ok(q, DL_PROMISCOFF_REQ);
break;
#else
case DL_PROMISCON_REQ: /* fall thru */
case DL_PROMISCOFF_REQ: /* fall thru */
#endif /* defined(SOL2) */
#endif /* DL_CURRENT_VERSION >= 2 */
#if DL_CURRENT_VERSION >= 2
case DL_SET_PHYS_ADDR_REQ:
case DL_SUBS_BIND_REQ:
case DL_SUBS_UNBIND_REQ:
case DL_ENABMULTI_REQ:
case DL_DISABMULTI_REQ:
case DL_XID_REQ:
case DL_TEST_REQ:
case DL_REPLY_UPDATE_REQ:
case DL_REPLY_REQ:
case DL_DATA_ACK_REQ:
#endif
case DL_CONNECT_REQ:
case DL_TOKEN_REQ:
dlpi_error(q, us, d->dl_primitive, DL_NOTSUPPORTED, 0);
break;
case DL_CONNECT_RES:
case DL_DISCONNECT_REQ:
case DL_RESET_REQ:
case DL_RESET_RES:
dlpi_error(q, us, d->dl_primitive, DL_OUTSTATE, 0);
break;
case DL_UDQOS_REQ:
dlpi_error(q, us, d->dl_primitive, DL_BADQOSTYPE, 0);
break;
#if DL_CURRENT_VERSION >= 2
case DL_TEST_RES:
case DL_XID_RES:
break;
#endif
default:
if (us->flags & US_DBGLOG)
DPRINT1("ppp: unknown dlpi prim 0x%x\n", d->dl_primitive);
/* fall through */
badprim:
dlpi_error(q, us, d->dl_primitive, DL_BADPRIM, 0);
break;
}
freemsg(mp);
}
static void
dlpi_error(q, us, prim, err, uerr)
queue_t *q;
upperstr_t *us;
int prim, err, uerr;
{
mblk_t *reply;
dl_error_ack_t *errp;
if (us->flags & US_DBGLOG)
DPRINT3("ppp/%d: dlpi error, prim=%x, err=%x\n", us->mn, prim, err);
reply = allocb(sizeof(dl_error_ack_t), BPRI_HI);
if (reply == 0)
return; /* XXX should do bufcall */
reply->b_datap->db_type = M_PCPROTO;
errp = (dl_error_ack_t *) reply->b_wptr;
reply->b_wptr += sizeof(dl_error_ack_t);
errp->dl_primitive = DL_ERROR_ACK;
errp->dl_error_primitive = prim;
errp->dl_errno = err;
errp->dl_unix_errno = uerr;
qreply(q, reply);
}
static void
dlpi_ok(q, prim)
queue_t *q;
int prim;
{
mblk_t *reply;
dl_ok_ack_t *okp;
reply = allocb(sizeof(dl_ok_ack_t), BPRI_HI);
if (reply == 0)
return; /* XXX should do bufcall */
reply->b_datap->db_type = M_PCPROTO;
okp = (dl_ok_ack_t *) reply->b_wptr;
reply->b_wptr += sizeof(dl_ok_ack_t);
okp->dl_primitive = DL_OK_ACK;
okp->dl_correct_primitive = prim;
qreply(q, reply);
}
#endif /* NO_DLPI */
/*
* If return value is 0, then the packet has already been freed.
*/
static int
pass_packet(us, mp, outbound)
upperstr_t *us;
mblk_t *mp;
int outbound;
{
int pass;
upperstr_t *ppa;
if ((ppa = us->ppa) == 0) {
freemsg(mp);
return 0;
}
#ifdef FILTER_PACKETS
pass = ip_hard_filter(us, mp, outbound);
#else
/*
* Here is where we might, in future, decide whether to pass
* or drop the packet, and whether it counts as link activity.
*/
pass = 1;
#endif /* FILTER_PACKETS */
if (pass < 0) {
/* pass only if link already up, and don't update time */
if (ppa->lowerq == 0) {
freemsg(mp);
return 0;
}
pass = 1;
} else if (pass) {
if (outbound)
ppa->last_sent = time;
else
ppa->last_recv = time;
}
return pass;
}
/*
* We have some data to send down to the lower stream (or up the
* control stream, if we don't have a lower stream attached).
* Returns 1 if the message was dealt with, 0 if it wasn't able
* to be sent on and should therefore be queued up.
*/
static int
send_data(mp, us)
mblk_t *mp;
upperstr_t *us;
{
upperstr_t *ppa;
if ((us->flags & US_BLOCKED) || us->npmode == NPMODE_QUEUE)
return 0;
ppa = us->ppa;
if (ppa == 0 || us->npmode == NPMODE_DROP || us->npmode == NPMODE_ERROR) {
if (us->flags & US_DBGLOG)
DPRINT2("ppp/%d: dropping pkt (npmode=%d)\n", us->mn, us->npmode);
freemsg(mp);
return 1;
}
if (ppa->lowerq == 0) {
/* try to send it up the control stream */
if (bcanputnext(ppa->q, mp->b_band)) {
/*
* The message seems to get corrupted for some reason if
* we just send the message up as it is, so we send a copy.
*/
mblk_t *np = copymsg(mp);
freemsg(mp);
if (np != 0)
putnext(ppa->q, np);
return 1;
}
} else {
if (bcanputnext(ppa->lowerq, mp->b_band)) {
MT_ENTER(&ppa->stats_lock);
ppa->stats.ppp_opackets++;
ppa->stats.ppp_obytes += msgdsize(mp);
#ifdef INCR_OPACKETS
INCR_OPACKETS(ppa);
#endif
MT_EXIT(&ppa->stats_lock);
/*
* The lower queue is only ever detached while holding an
* exclusive lock on the whole driver. So we can be confident
* that the lower queue is still there.
*/
putnext(ppa->lowerq, mp);
return 1;
}
}
us->flags |= US_BLOCKED;
return 0;
}
/*
* Allocate a new PPA id and link this stream into the list of PPAs.
* This procedure is called with an exclusive lock on all queues in
* this driver.
*/
static void
new_ppa(q, mp)
queue_t *q;
mblk_t *mp;
{
upperstr_t *us, *up, **usp;
int ppa_id;
us = (upperstr_t *) q->q_ptr;
if (us == 0) {
DPRINT("new_ppa: q_ptr = 0!\n");
return;
}
usp = &ppas;
ppa_id = 0;
while ((up = *usp) != 0 && ppa_id == up->ppa_id) {
++ppa_id;
usp = &up->nextppa;
}
us->ppa_id = ppa_id;
us->ppa = us;
us->next = 0;
us->nextppa = *usp;
*usp = us;
us->flags |= US_CONTROL;
us->npmode = NPMODE_PASS;
us->mtu = PPP_MTU;
us->mru = PPP_MRU;
#ifdef SOL2
/*
* Create a kstats record for our statistics, so netstat -i works.
*/
if (us->kstats == 0) {
char unit[32];
sprintf(unit, "ppp%d", us->ppa->ppa_id);
us->kstats = kstat_create("ppp", us->ppa->ppa_id, unit,
"net", KSTAT_TYPE_NAMED, 4, 0);
if (us->kstats != 0) {
kstat_named_t *kn = KSTAT_NAMED_PTR(us->kstats);
strcpy(kn[0].name, "ipackets");
kn[0].data_type = KSTAT_DATA_ULONG;
strcpy(kn[1].name, "ierrors");
kn[1].data_type = KSTAT_DATA_ULONG;
strcpy(kn[2].name, "opackets");
kn[2].data_type = KSTAT_DATA_ULONG;
strcpy(kn[3].name, "oerrors");
kn[3].data_type = KSTAT_DATA_ULONG;
kstat_install(us->kstats);
}
}
#endif /* SOL2 */
*(int *)mp->b_cont->b_rptr = ppa_id;
mp->b_datap->db_type = M_IOCACK;
qreply(q, mp);
}
static void
attach_ppa(q, mp)
queue_t *q;
mblk_t *mp;
{
upperstr_t *us, *t;
us = (upperstr_t *) q->q_ptr;
if (us == 0) {
DPRINT("attach_ppa: q_ptr = 0!\n");
return;
}
#ifndef NO_DLPI
us->state = DL_UNBOUND;
#endif
for (t = us->ppa; t->next != 0; t = t->next)
;
t->next = us;
us->next = 0;
if (mp->b_datap->db_type == M_IOCTL) {
mp->b_datap->db_type = M_IOCACK;
qreply(q, mp);
} else {
#ifndef NO_DLPI
dlpi_ok(q, DL_ATTACH_REQ);
#endif
freemsg(mp);
}
}
#ifndef NO_DLPI
static void
detach_ppa(q, mp)
queue_t *q;
mblk_t *mp;
{
upperstr_t *us, *t;
us = (upperstr_t *) q->q_ptr;
if (us == 0) {
DPRINT("detach_ppa: q_ptr = 0!\n");
return;
}
for (t = us->ppa; t->next != 0; t = t->next)
if (t->next == us) {
t->next = us->next;
break;
}
us->next = 0;
us->ppa = 0;
us->state = DL_UNATTACHED;
dlpi_ok(q, DL_DETACH_REQ);
freemsg(mp);
}
#endif
/*
* We call this with qwriter in order to give the upper queue procedures
* the guarantee that the lower queue is not going to go away while
* they are executing.
*/
static void
detach_lower(q, mp)
queue_t *q;
mblk_t *mp;
{
upperstr_t *us;
us = (upperstr_t *) q->q_ptr;
if (us == 0) {
DPRINT("detach_lower: q_ptr = 0!\n");
return;
}
LOCK_LOWER_W;
us->lowerq->q_ptr = 0;
RD(us->lowerq)->q_ptr = 0;
us->lowerq = 0;
UNLOCK_LOWER;
/* Unblock streams which now feed back up the control stream. */
qenable(us->q);
mp->b_datap->db_type = M_IOCACK;
qreply(q, mp);
}
static int
pppuwsrv(q)
queue_t *q;
{
upperstr_t *us, *as;
mblk_t *mp;
us = (upperstr_t *) q->q_ptr;
if (us == 0) {
DPRINT("pppuwsrv: q_ptr = 0!\n");
return 0;
}
/*
* If this is a control stream, then this service procedure
* probably got enabled because of flow control in the lower
* stream being enabled (or because of the lower stream going
* away). Therefore we enable the service procedure of all
* attached upper streams.
*/
if (us->flags & US_CONTROL) {
for (as = us->next; as != 0; as = as->next)
qenable(WR(as->q));
}
/* Try to send on any data queued here. */
us->flags &= ~US_BLOCKED;
while ((mp = getq(q)) != 0) {
if (!send_data(mp, us)) {
putbq(q, mp);
break;
}
}
return 0;
}
/* should never get called... */
static int
ppplwput(q, mp)
queue_t *q;
mblk_t *mp;
{
putnext(q, mp);
return 0;
}
static int
ppplwsrv(q)
queue_t *q;
{
queue_t *uq;
/*
* Flow control has back-enabled this stream:
* enable the upper write service procedure for
* the upper control stream for this lower stream.
*/
LOCK_LOWER_R;
uq = (queue_t *) q->q_ptr;
if (uq != 0)
qenable(uq);
UNLOCK_LOWER;
return 0;
}
/*
* This should only get called for control streams.
*/
static int
pppurput(q, mp)
queue_t *q;
mblk_t *mp;
{
upperstr_t *ppa, *us;
int proto, len;
struct iocblk *iop;
ppa = (upperstr_t *) q->q_ptr;
if (ppa == 0) {
DPRINT("pppurput: q_ptr = 0!\n");
return 0;
}
switch (mp->b_datap->db_type) {
case M_CTL:
MT_ENTER(&ppa->stats_lock);
switch (*mp->b_rptr) {
case PPPCTL_IERROR:
#ifdef INCR_IERRORS
INCR_IERRORS(ppa);
#endif
ppa->stats.ppp_ierrors++;
break;
case PPPCTL_OERROR:
#ifdef INCR_OERRORS
INCR_OERRORS(ppa);
#endif
ppa->stats.ppp_oerrors++;
break;
}
MT_EXIT(&ppa->stats_lock);
freemsg(mp);
break;
case M_IOCACK:
case M_IOCNAK:
/*
* Attempt to match up the response with the stream
* that the request came from.
*/
iop = (struct iocblk *) mp->b_rptr;
for (us = ppa; us != 0; us = us->next)
if (us->ioc_id == iop->ioc_id)
break;
if (us == 0)
freemsg(mp);
else
putnext(us->q, mp);
break;
case M_HANGUP:
/*
* The serial device has hung up. We don't want to send
* the M_HANGUP message up to pppd because that will stop
* us from using the control stream any more. Instead we
* send a zero-length message as an end-of-file indication.
*/
freemsg(mp);
mp = allocb(1, BPRI_HI);
if (mp == 0) {
DPRINT1("ppp/%d: couldn't allocate eof message!\n", ppa->mn);
break;
}
putnext(ppa->q, mp);
break;
case M_DATA:
len = msgdsize(mp);
if (mp->b_wptr - mp->b_rptr < PPP_HDRLEN) {
PULLUP(mp, PPP_HDRLEN);
if (mp == 0) {
DPRINT1("ppp_urput: msgpullup failed (len=%d)\n", len);
break;
}
}
MT_ENTER(&ppa->stats_lock);
ppa->stats.ppp_ipackets++;
ppa->stats.ppp_ibytes += len;
#ifdef INCR_IPACKETS
INCR_IPACKETS(ppa);
#endif
MT_EXIT(&ppa->stats_lock);
proto = PPP_PROTOCOL(mp->b_rptr);
#if defined(SOL2)
/*
* Should there be any promiscuous stream(s), send the data
* up for each promiscuous stream that we recognize.
*/
promisc_sendup(ppa, mp, proto, 1);
#endif /* defined(SOL2) */
if (proto < 0x8000 && (us = find_dest(ppa, proto)) != 0) {
/*
* A data packet for some network protocol.
* Queue it on the upper stream for that protocol.
* XXX could we just putnext it? (would require thought)
* The rblocked flag is there to ensure that we keep
* messages in order for each network protocol.
*/
/* pass_packet frees the packet on returning 0 */
if (!pass_packet(us, mp, 0))
break;
if (!us->rblocked && !canput(us->q))
us->rblocked = 1;
if (!putq(us->rblocked ? q : us->q, mp))
freemsg(mp);
break;
}
/* FALLTHROUGH */
default:
/*
* A control frame, a frame for an unknown protocol,
* or some other message type.
* Send it up to pppd via the control stream.
*/
if (queclass(mp) == QPCTL || canputnext(ppa->q))
putnext(ppa->q, mp);
else if (!putq(q, mp))
freemsg(mp);
break;
}
return 0;
}
static int
pppursrv(q)
queue_t *q;
{
upperstr_t *us, *as;
mblk_t *mp, *hdr;
#ifndef NO_DLPI
dl_unitdata_ind_t *ud;
#endif
int proto;
us = (upperstr_t *) q->q_ptr;
if (us == 0) {
DPRINT("pppursrv: q_ptr = 0!\n");
return 0;
}
if (us->flags & US_CONTROL) {
/*
* A control stream.
* If there is no lower queue attached, run the write service
* routines of other upper streams attached to this PPA.
*/
if (us->lowerq == 0) {
as = us;
do {
if (as->flags & US_BLOCKED)
qenable(WR(as->q));
as = as->next;
} while (as != 0);
}
/*
* Messages get queued on this stream's read queue if they
* can't be queued on the read queue of the attached stream
* that they are destined for. This is for flow control -
* when this queue fills up, the lower read put procedure will
* queue messages there and the flow control will propagate
* down from there.
*/
while ((mp = getq(q)) != 0) {
proto = PPP_PROTOCOL(mp->b_rptr);
if (proto < 0x8000 && (as = find_dest(us, proto)) != 0) {
if (!canput(as->q))
break;
if (!putq(as->q, mp))
freemsg(mp);
} else {
if (!canputnext(q))
break;
putnext(q, mp);
}
}
if (mp) {
putbq(q, mp);
} else {
/* can now put stuff directly on network protocol streams again */
for (as = us->next; as != 0; as = as->next)
as->rblocked = 0;
}
/*
* If this stream has a lower stream attached,
* enable the read queue's service routine.
* XXX we should really only do this if the queue length
* has dropped below the low-water mark.
*/
if (us->lowerq != 0)
qenable(RD(us->lowerq));
} else {
/*
* A network protocol stream. Put a DLPI header on each
* packet and send it on.
* (Actually, it seems that the IP module will happily
* accept M_DATA messages without the DL_UNITDATA_IND header.)
*/
while ((mp = getq(q)) != 0) {
if (!canputnext(q)) {
putbq(q, mp);
break;
}
#ifndef NO_DLPI
proto = PPP_PROTOCOL(mp->b_rptr);
mp->b_rptr += PPP_HDRLEN;
hdr = allocb(sizeof(dl_unitdata_ind_t) + 2 * sizeof(uint),
BPRI_MED);
if (hdr == 0) {
/* XXX should put it back and use bufcall */
freemsg(mp);
continue;
}
hdr->b_datap->db_type = M_PROTO;
ud = (dl_unitdata_ind_t *) hdr->b_wptr;
hdr->b_wptr += sizeof(dl_unitdata_ind_t) + 2 * sizeof(uint);
hdr->b_cont = mp;
ud->dl_primitive = DL_UNITDATA_IND;
ud->dl_dest_addr_length = sizeof(uint);
ud->dl_dest_addr_offset = sizeof(dl_unitdata_ind_t);
ud->dl_src_addr_length = sizeof(uint);
ud->dl_src_addr_offset = ud->dl_dest_addr_offset + sizeof(uint);
#if DL_CURRENT_VERSION >= 2
ud->dl_group_address = 0;
#endif
/* Send the DLPI client the data with the SAP they requested,
(e.g. ETHERTYPE_IP) rather than the PPP protocol number
(e.g. PPP_IP) */
((uint *)(ud + 1))[0] = us->req_sap; /* dest SAP */
((uint *)(ud + 1))[1] = us->req_sap; /* src SAP */
putnext(q, hdr);
#else /* NO_DLPI */
putnext(q, mp);
#endif /* NO_DLPI */
}
/*
* Now that we have consumed some packets from this queue,
* enable the control stream's read service routine so that we
* can process any packets for us that might have got queued
* there for flow control reasons.
*/
if (us->ppa)
qenable(us->ppa->q);
}
return 0;
}
static upperstr_t *
find_dest(ppa, proto)
upperstr_t *ppa;
int proto;
{
upperstr_t *us;
for (us = ppa->next; us != 0; us = us->next)
if (proto == us->sap)
break;
return us;
}
#if defined (SOL2)
/*
* Test upstream promiscuous conditions. As of now, only pass IPv4 and
* Ipv6 packets upstream (let PPP packets be decoded elsewhere).
*/
static upperstr_t *
find_promisc(us, proto)
upperstr_t *us;
int proto;
{
if ((proto != PPP_IP) && (proto != PPP_IPV6))
return (upperstr_t *)0;
for ( ; us; us = us->next) {
if ((us->flags & US_PROMISC) && (us->state == DL_IDLE))
return us;
}
return (upperstr_t *)0;
}
/*
* Prepend an empty Ethernet header to msg for snoop, et al.
*/
static mblk_t *
prepend_ether(us, mp, proto)
upperstr_t *us;
mblk_t *mp;
int proto;
{
mblk_t *eh;
int type;
if ((eh = allocb(sizeof(struct ether_header), BPRI_HI)) == 0) {
freemsg(mp);
return (mblk_t *)0;
}
if (proto == PPP_IP)
type = ETHERTYPE_IP;
else if (proto == PPP_IPV6)
type = ETHERTYPE_IPV6;
else
type = proto; /* What else? Let decoder decide */
eh->b_wptr += sizeof(struct ether_header);
bzero((caddr_t)eh->b_rptr, sizeof(struct ether_header));
((struct ether_header *)eh->b_rptr)->ether_type = htons((short)type);
eh->b_cont = mp;
return (eh);
}
/*
* Prepend DL_UNITDATA_IND mblk to msg
*/
static mblk_t *
prepend_udind(us, mp, proto)
upperstr_t *us;
mblk_t *mp;
int proto;
{
dl_unitdata_ind_t *dlu;
mblk_t *dh;
size_t size;
size = sizeof(dl_unitdata_ind_t);
if ((dh = allocb(size, BPRI_MED)) == 0) {
freemsg(mp);
return (mblk_t *)0;
}
dh->b_datap->db_type = M_PROTO;
dh->b_wptr = dh->b_datap->db_lim;
dh->b_rptr = dh->b_wptr - size;
dlu = (dl_unitdata_ind_t *)dh->b_rptr;
dlu->dl_primitive = DL_UNITDATA_IND;
dlu->dl_dest_addr_length = 0;
dlu->dl_dest_addr_offset = sizeof(dl_unitdata_ind_t);
dlu->dl_src_addr_length = 0;
dlu->dl_src_addr_offset = sizeof(dl_unitdata_ind_t);
dlu->dl_group_address = 0;
dh->b_cont = mp;
return (dh);
}
/*
* For any recognized promiscuous streams, send data upstream
*/
static void
promisc_sendup(ppa, mp, proto, skip)
upperstr_t *ppa;
mblk_t *mp;
int proto, skip;
{
mblk_t *dup_mp, *dup_dup_mp;
upperstr_t *prus, *nprus;
if ((prus = find_promisc(ppa, proto)) != 0) {
if (dup_mp = dupmsg(mp)) {
if (skip)
dup_mp->b_rptr += PPP_HDRLEN;
for ( ; nprus = find_promisc(prus->next, proto);
prus = nprus) {
if (dup_dup_mp = dupmsg(dup_mp)) {
if (canputnext(prus->q)) {
if (prus->flags & US_RAWDATA) {
dup_dup_mp = prepend_ether(prus, dup_dup_mp, proto);
} else {
dup_dup_mp = prepend_udind(prus, dup_dup_mp, proto);
}
if (dup_dup_mp == 0)
continue;
putnext(prus->q, dup_dup_mp);
} else {
DPRINT("ppp_urput: data to promisc q dropped\n");
freemsg(dup_dup_mp);
}
}
}
if (canputnext(prus->q)) {
if (prus->flags & US_RAWDATA) {
dup_mp = prepend_ether(prus, dup_mp, proto);
} else {
dup_mp = prepend_udind(prus, dup_mp, proto);
}
if (dup_mp != 0)
putnext(prus->q, dup_mp);
} else {
DPRINT("ppp_urput: data to promisc q dropped\n");
freemsg(dup_mp);
}
}
}
}
#endif /* defined(SOL2) */
/*
* We simply put the message on to the associated upper control stream
* (either here or in ppplrsrv). That way we enter the perimeters
* before looking through the list of attached streams to decide which
* stream it should go up.
*/
static int
ppplrput(q, mp)
queue_t *q;
mblk_t *mp;
{
queue_t *uq;
struct iocblk *iop;
switch (mp->b_datap->db_type) {
case M_IOCTL:
iop = (struct iocblk *) mp->b_rptr;
iop->ioc_error = EINVAL;
mp->b_datap->db_type = M_IOCNAK;
qreply(q, mp);
return 0;
case M_FLUSH:
if (*mp->b_rptr & FLUSHR)
flushq(q, FLUSHDATA);
if (*mp->b_rptr & FLUSHW) {
*mp->b_rptr &= ~FLUSHR;
qreply(q, mp);
} else
freemsg(mp);
return 0;
}
/*
* If we can't get the lower lock straight away, queue this one
* rather than blocking, to avoid the possibility of deadlock.
*/
if (!TRYLOCK_LOWER_R) {
if (!putq(q, mp))
freemsg(mp);
return 0;
}
/*
* Check that we're still connected to the driver.
*/
uq = (queue_t *) q->q_ptr;
if (uq == 0) {
UNLOCK_LOWER;
DPRINT1("ppplrput: q = %x, uq = 0??\n", q);
freemsg(mp);
return 0;
}
/*
* Try to forward the message to the put routine for the upper
* control stream for this lower stream.
* If there are already messages queued here, queue this one so
* they don't get out of order.
*/
if (queclass(mp) == QPCTL || (qsize(q) == 0 && canput(uq)))
put(uq, mp);
else if (!putq(q, mp))
freemsg(mp);
UNLOCK_LOWER;
return 0;
}
static int
ppplrsrv(q)
queue_t *q;
{
mblk_t *mp;
queue_t *uq;
/*
* Packets get queued here for flow control reasons
* or if the lrput routine couldn't get the lower lock
* without blocking.
*/
LOCK_LOWER_R;
uq = (queue_t *) q->q_ptr;
if (uq == 0) {
UNLOCK_LOWER;
flushq(q, FLUSHALL);
DPRINT1("ppplrsrv: q = %x, uq = 0??\n", q);
return 0;
}
while ((mp = getq(q)) != 0) {
if (queclass(mp) == QPCTL || canput(uq))
put(uq, mp);
else {
putbq(q, mp);
break;
}
}
UNLOCK_LOWER;
return 0;
}
static int
putctl2(q, type, code, val)
queue_t *q;
int type, code, val;
{
mblk_t *mp;
mp = allocb(2, BPRI_HI);
if (mp == 0)
return 0;
mp->b_datap->db_type = type;
mp->b_wptr[0] = code;
mp->b_wptr[1] = val;
mp->b_wptr += 2;
putnext(q, mp);
return 1;
}
static int
putctl4(q, type, code, val)
queue_t *q;
int type, code, val;
{
mblk_t *mp;
mp = allocb(4, BPRI_HI);
if (mp == 0)
return 0;
mp->b_datap->db_type = type;
mp->b_wptr[0] = code;
((short *)mp->b_wptr)[1] = val;
mp->b_wptr += 4;
putnext(q, mp);
return 1;
}
static void
debug_dump(q, mp)
queue_t *q;
mblk_t *mp;
{
upperstr_t *us;
queue_t *uq, *lq;
DPRINT("ppp upper streams:\n");
for (us = minor_devs; us != 0; us = us->nextmn) {
uq = us->q;
DPRINT3(" %d: q=%x rlev=%d",
us->mn, uq, (uq? qsize(uq): 0));
DPRINT3(" wlev=%d flags=0x%b", (uq? qsize(WR(uq)): 0),
us->flags, "\020\1priv\2control\3blocked\4last");
DPRINT3(" state=%x sap=%x req_sap=%x", us->state, us->sap,
us->req_sap);
if (us->ppa == 0)
DPRINT(" ppa=?\n");
else
DPRINT1(" ppa=%d\n", us->ppa->ppa_id);
if (us->flags & US_CONTROL) {
lq = us->lowerq;
DPRINT3(" control for %d lq=%x rlev=%d",
us->ppa_id, lq, (lq? qsize(RD(lq)): 0));
DPRINT3(" wlev=%d mru=%d mtu=%d\n",
(lq? qsize(lq): 0), us->mru, us->mtu);
}
}
mp->b_datap->db_type = M_IOCACK;
qreply(q, mp);
}
#ifdef FILTER_PACKETS
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/udp.h>
#include <netinet/tcp.h>
#define MAX_IPHDR 128 /* max TCP/IP header size */
/* The following table contains a hard-coded list of protocol/port pairs.
* Any matching packets are either discarded unconditionally, or,
* if ok_if_link_up is non-zero when a connection does not currently exist
* (i.e., they go through if the connection is present, but never initiate
* a dial-out).
* This idea came from a post by dm@garage.uun.org (David Mazieres)
*/
static struct pktfilt_tab {
int proto;
u_short port;
u_short ok_if_link_up;
} pktfilt_tab[] = {
{ IPPROTO_UDP, 520, 1 }, /* RIP, ok to pass if link is up */
{ IPPROTO_UDP, 123, 1 }, /* NTP, don't keep up the link for it */
{ -1, 0, 0 } /* terminator entry has port == -1 */
};
/*
* Packet has already been freed if return value is 0.
*/
static int
ip_hard_filter(us, mp, outbound)
upperstr_t *us;
mblk_t *mp;
int outbound;
{
struct ip *ip;
struct pktfilt_tab *pft;
mblk_t *temp_mp;
int proto;
int len, hlen;
/* Note, the PPP header has already been pulled up in all cases */
proto = PPP_PROTOCOL(mp->b_rptr);
if (us->flags & US_DBGLOG)
DPRINT3("ppp/%d: filter, proto=0x%x, out=%d\n", us->mn, proto, outbound);
switch (proto)
{
case PPP_IP:
if ((mp->b_wptr - mp->b_rptr) == PPP_HDRLEN && mp->b_cont != 0) {
temp_mp = mp->b_cont;
len = msgdsize(temp_mp);
hlen = (len < MAX_IPHDR) ? len : MAX_IPHDR;
PULLUP(temp_mp, hlen);
if (temp_mp == 0) {
DPRINT2("ppp/%d: filter, pullup next failed, len=%d\n",
us->mn, hlen);
mp->b_cont = 0; /* PULLUP() freed the rest */
freemsg(mp);
return 0;
}
ip = (struct ip *)mp->b_cont->b_rptr;
}
else {
len = msgdsize(mp);
hlen = (len < (PPP_HDRLEN+MAX_IPHDR)) ? len : (PPP_HDRLEN+MAX_IPHDR);
PULLUP(mp, hlen);
if (mp == 0) {
DPRINT2("ppp/%d: filter, pullup failed, len=%d\n",
us->mn, hlen);
return 0;
}
ip = (struct ip *)(mp->b_rptr + PPP_HDRLEN);
}
/* For IP traffic, certain packets (e.g., RIP) may be either
* 1. ignored - dropped completely
* 2. will not initiate a connection, but
* will be passed if a connection is currently up.
*/
for (pft=pktfilt_tab; pft->proto != -1; pft++) {
if (ip->ip_p == pft->proto) {
switch(pft->proto) {
case IPPROTO_UDP:
if (((struct udphdr *) &((int *)ip)[ip->ip_hl])->uh_dport
== htons(pft->port)) goto endfor;
break;
case IPPROTO_TCP:
if (((struct tcphdr *) &((int *)ip)[ip->ip_hl])->th_dport
== htons(pft->port)) goto endfor;
break;
}
}
}
endfor:
if (pft->proto != -1) {
if (us->flags & US_DBGLOG)
DPRINT3("ppp/%d: found IP pkt, proto=0x%x (%d)\n",
us->mn, pft->proto, pft->port);
/* Discard if not connected, or if not pass_with_link_up */
/* else, if link is up let go by, but don't update time */
if (pft->ok_if_link_up)
return -1;
freemsg(mp);
return 0;
}
break;
} /* end switch (proto) */
return 1;
}
#endif /* FILTER_PACKETS */
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