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src/sys/net/if_ppp.c

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/* $OpenBSD: if_ppp.c,v 1.118 2024/02/28 16:08:34 denis Exp $ */
/* $NetBSD: if_ppp.c,v 1.39 1997/05/17 21:11:59 christos Exp $ */
/*
* if_ppp.c - Point-to-Point Protocol (PPP) Asynchronous driver.
*
* Copyright (c) 1984-2000 Carnegie Mellon University. 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 "Carnegie Mellon University" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For permission or any legal
* details, please contact
* Office of Technology Transfer
* Carnegie Mellon University
* 5000 Forbes Avenue
* Pittsburgh, PA 15213-3890
* (412) 268-4387, fax: (412) 268-7395
* tech-transfer@andrew.cmu.edu
*
* 4. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by Computing Services
* at Carnegie Mellon University (http://www.cmu.edu/computing/)."
*
* CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
* THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY 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.
*
* Based on:
* @(#)if_sl.c 7.6.1.2 (Berkeley) 2/15/89
*
* Copyright (c) 1987, 1989, 1992, 1993
* The Regents of the University of California. 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. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
*
* Serial Line interface
*
* Rick Adams
* Center for Seismic Studies
* 1300 N 17th Street, Suite 1450
* Arlington, Virginia 22209
* (703)276-7900
* rick@seismo.ARPA
* seismo!rick
*
* Pounded on heavily by Chris Torek (chris@mimsy.umd.edu, umcp-cs!chris).
* Converted to 4.3BSD Beta by Chris Torek.
* Other changes made at Berkeley, based in part on code by Kirk Smith.
*
* Converted to 4.3BSD+ 386BSD by Brad Parker (brad@cayman.com)
* Added VJ tcp header compression; more unified ioctls
*
* Extensively modified by Paul Mackerras (paulus@cs.anu.edu.au).
* Cleaned up a lot of the mbuf-related code to fix bugs that
* caused system crashes and packet corruption. Changed pppstart
* so that it doesn't just give up with a collision if the whole
* packet doesn't fit in the output ring buffer.
*
* Added priority queueing for interactive IP packets, following
* the model of if_sl.c, plus hooks for bpf.
* Paul Mackerras (paulus@cs.anu.edu.au).
*/
/* from if_sl.c,v 1.11 84/10/04 12:54:47 rick Exp */
/* from NetBSD: if_ppp.c,v 1.15.2.2 1994/07/28 05:17:58 cgd Exp */
#include "ppp.h"
#if NPPP > 0
#define VJC
#define PPP_COMPRESS
#include <sys/param.h>
#include <sys/proc.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/time.h>
#include <sys/malloc.h>
#include <net/if.h>
#include <net/if_var.h>
#include <net/if_types.h>
#include <net/netisr.h>
#include <net/route.h>
#include <net/bpf.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include "bpfilter.h"
#ifdef VJC
#include <net/slcompress.h>
#endif
#include <net/ppp_defs.h>
#include <net/if_ppp.h>
#include <net/if_pppvar.h>
#ifdef PPP_COMPRESS
#define PACKETPTR struct mbuf *
#include <net/ppp-comp.h>
#endif
static int pppsioctl(struct ifnet *, u_long, caddr_t);
static void ppp_requeue(struct ppp_softc *);
static void ppp_ccp(struct ppp_softc *, struct mbuf *m, int rcvd);
static void ppp_ccp_closed(struct ppp_softc *);
static void ppp_inproc(struct ppp_softc *, struct mbuf *);
static void pppdumpm(struct mbuf *m0);
static void ppp_ifstart(struct ifnet *ifp);
int ppp_clone_create(struct if_clone *, int);
int ppp_clone_destroy(struct ifnet *);
void ppp_pkt_list_init(struct ppp_pkt_list *, u_int);
int ppp_pkt_enqueue(struct ppp_pkt_list *, struct ppp_pkt *);
struct ppp_pkt *ppp_pkt_dequeue(struct ppp_pkt_list *);
struct mbuf *ppp_pkt_mbuf(struct ppp_pkt *);
/*
* We steal two bits in the mbuf m_flags, to mark high-priority packets
* for output, and received packets following lost/corrupted packets.
*/
#define M_ERRMARK M_LINK0 /* steal a bit in mbuf m_flags */
#ifdef PPP_COMPRESS
/*
* List of compressors we know about.
*/
extern struct compressor ppp_bsd_compress;
extern struct compressor ppp_deflate, ppp_deflate_draft;
struct compressor *ppp_compressors[] = {
#if DO_BSD_COMPRESS && defined(PPP_BSDCOMP)
&ppp_bsd_compress,
#endif
#if DO_DEFLATE && defined(PPP_DEFLATE)
&ppp_deflate,
&ppp_deflate_draft,
#endif
NULL
};
#endif /* PPP_COMPRESS */
LIST_HEAD(, ppp_softc) ppp_softc_list;
struct if_clone ppp_cloner =
IF_CLONE_INITIALIZER("ppp", ppp_clone_create, ppp_clone_destroy);
/*
* Called from boot code to establish ppp interfaces.
*/
void
pppattach(void)
{
LIST_INIT(&ppp_softc_list);
if_clone_attach(&ppp_cloner);
}
int
ppp_clone_create(struct if_clone *ifc, int unit)
{
struct ppp_softc *sc;
struct ifnet *ifp;
sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO);
sc->sc_unit = unit;
ifp = &sc->sc_if;
snprintf(sc->sc_if.if_xname, sizeof sc->sc_if.if_xname, "%s%d",
ifc->ifc_name, unit);
sc->sc_if.if_softc = sc;
sc->sc_if.if_mtu = PPP_MTU;
sc->sc_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST;
sc->sc_if.if_type = IFT_PPP;
sc->sc_if.if_hdrlen = PPP_HDRLEN;
sc->sc_if.if_ioctl = pppsioctl;
sc->sc_if.if_output = pppoutput;
sc->sc_if.if_start = ppp_ifstart;
sc->sc_if.if_rtrequest = p2p_rtrequest;
mq_init(&sc->sc_inq, IFQ_MAXLEN, IPL_NET);
ppp_pkt_list_init(&sc->sc_rawq, IFQ_MAXLEN);
if_attach(&sc->sc_if);
if_alloc_sadl(&sc->sc_if);
#if NBPFILTER > 0
bpfattach(&ifp->if_bpf, ifp, DLT_PPP, PPP_HDRLEN);
#endif
NET_LOCK();
LIST_INSERT_HEAD(&ppp_softc_list, sc, sc_list);
NET_UNLOCK();
return (0);
}
int
ppp_clone_destroy(struct ifnet *ifp)
{
struct ppp_softc *sc = ifp->if_softc;
if (sc->sc_devp != NULL)
return (EBUSY);
NET_LOCK();
LIST_REMOVE(sc, sc_list);
NET_UNLOCK();
if_detach(ifp);
free(sc, M_DEVBUF, 0);
return (0);
}
/*
* Allocate a ppp interface unit and initialize it.
*/
struct ppp_softc *
pppalloc(pid_t pid)
{
int i;
struct ppp_softc *sc;
NET_LOCK();
LIST_FOREACH(sc, &ppp_softc_list, sc_list) {
if (sc->sc_xfer == pid) {
sc->sc_xfer = 0;
NET_UNLOCK();
return sc;
}
}
LIST_FOREACH(sc, &ppp_softc_list, sc_list) {
if (sc->sc_devp == NULL)
break;
}
NET_UNLOCK();
if (sc == NULL)
return NULL;
sc->sc_flags = 0;
sc->sc_mru = PPP_MRU;
sc->sc_relinq = NULL;
bzero((char *)&sc->sc_stats, sizeof(sc->sc_stats));
#ifdef VJC
sc->sc_comp = malloc(sizeof(struct slcompress), M_DEVBUF, M_NOWAIT);
if (sc->sc_comp)
sl_compress_init(sc->sc_comp);
#endif
#ifdef PPP_COMPRESS
sc->sc_xc_state = NULL;
sc->sc_rc_state = NULL;
#endif /* PPP_COMPRESS */
for (i = 0; i < NUM_NP; ++i)
sc->sc_npmode[i] = NPMODE_ERROR;
ml_init(&sc->sc_npqueue);
sc->sc_last_sent = sc->sc_last_recv = getuptime();
return sc;
}
/*
* Deallocate a ppp unit.
*/
void
pppdealloc(struct ppp_softc *sc)
{
struct ppp_pkt *pkt;
NET_LOCK();
if_down(&sc->sc_if);
sc->sc_if.if_flags &= ~IFF_RUNNING;
sc->sc_devp = NULL;
sc->sc_xfer = 0;
while ((pkt = ppp_pkt_dequeue(&sc->sc_rawq)) != NULL)
ppp_pkt_free(pkt);
mq_purge(&sc->sc_inq);
ml_purge(&sc->sc_npqueue);
m_freem(sc->sc_togo);
sc->sc_togo = NULL;
#ifdef PPP_COMPRESS
ppp_ccp_closed(sc);
sc->sc_xc_state = NULL;
sc->sc_rc_state = NULL;
#endif /* PPP_COMPRESS */
#if NBPFILTER > 0
if (sc->sc_pass_filt.bf_insns != 0) {
free(sc->sc_pass_filt.bf_insns, M_DEVBUF, 0);
sc->sc_pass_filt.bf_insns = 0;
sc->sc_pass_filt.bf_len = 0;
}
if (sc->sc_active_filt.bf_insns != 0) {
free(sc->sc_active_filt.bf_insns, M_DEVBUF, 0);
sc->sc_active_filt.bf_insns = 0;
sc->sc_active_filt.bf_len = 0;
}
#endif
#ifdef VJC
if (sc->sc_comp != 0) {
free(sc->sc_comp, M_DEVBUF, 0);
sc->sc_comp = 0;
}
#endif
NET_UNLOCK();
}
/*
* Ioctl routine for generic ppp devices.
*/
int
pppioctl(struct ppp_softc *sc, u_long cmd, caddr_t data, int flag,
struct proc *p)
{
int s, error, flags, mru, npx;
u_int nb;
struct ppp_option_data *odp;
struct compressor **cp;
struct npioctl *npi;
time_t t;
#if NBPFILTER > 0
struct bpf_program *bp, *nbp;
struct bpf_insn *newcode, *oldcode;
int newcodelen;
#endif
#ifdef PPP_COMPRESS
u_char ccp_option[CCP_MAX_OPTION_LENGTH];
#endif
switch (cmd) {
case FIONREAD:
*(int *)data = mq_len(&sc->sc_inq);
break;
case PPPIOCGUNIT:
*(int *)data = sc->sc_unit; /* XXX */
break;
case PPPIOCGFLAGS:
*(u_int *)data = sc->sc_flags;
break;
case PPPIOCSFLAGS:
if ((error = suser(p)) != 0)
return (error);
flags = *(int *)data & SC_MASK;
#ifdef PPP_COMPRESS
if (sc->sc_flags & SC_CCP_OPEN && !(flags & SC_CCP_OPEN))
ppp_ccp_closed(sc);
#endif
s = splnet();
sc->sc_flags = (sc->sc_flags & ~SC_MASK) | flags;
splx(s);
break;
case PPPIOCSMRU:
if ((error = suser(p)) != 0)
return (error);
mru = *(int *)data;
if (mru >= PPP_MRU && mru <= PPP_MAXMRU)
sc->sc_mru = mru;
break;
case PPPIOCGMRU:
*(int *)data = sc->sc_mru;
break;
#ifdef VJC
case PPPIOCSMAXCID:
if ((error = suser(p)) != 0)
return (error);
if (sc->sc_comp)
sl_compress_setup(sc->sc_comp, *(int *)data);
break;
#endif
case PPPIOCXFERUNIT:
if ((error = suser(p)) != 0)
return (error);
sc->sc_xfer = p->p_p->ps_pid;
break;
#ifdef PPP_COMPRESS
case PPPIOCSCOMPRESS:
if ((error = suser(p)) != 0)
return (error);
odp = (struct ppp_option_data *) data;
nb = odp->length;
if (nb > sizeof(ccp_option))
nb = sizeof(ccp_option);
if ((error = copyin(odp->ptr, ccp_option, nb)) != 0)
return (error);
/* preliminary check on the length byte */
if (ccp_option[1] < 2)
return (EINVAL);
for (cp = ppp_compressors; *cp != NULL; ++cp)
if ((*cp)->compress_proto == ccp_option[0]) {
/*
* Found a handler for the protocol - try to allocate
* a compressor or decompressor.
*/
error = 0;
if (odp->transmit) {
if (sc->sc_xc_state != NULL) {
(*sc->sc_xcomp->comp_free)(
sc->sc_xc_state);
}
sc->sc_xcomp = *cp;
sc->sc_xc_state = (*cp)->comp_alloc(ccp_option,
nb);
if (sc->sc_xc_state == NULL) {
if (sc->sc_flags & SC_DEBUG)
printf(
"%s: comp_alloc failed\n",
sc->sc_if.if_xname);
error = ENOBUFS;
}
s = splnet();
sc->sc_flags &= ~SC_COMP_RUN;
splx(s);
} else {
if (sc->sc_rc_state != NULL) {
(*sc->sc_rcomp->decomp_free)(
sc->sc_rc_state);
}
sc->sc_rcomp = *cp;
sc->sc_rc_state = (*cp)->decomp_alloc(
ccp_option, nb);
if (sc->sc_rc_state == NULL) {
if (sc->sc_flags & SC_DEBUG) {
printf(
"%s: decomp_alloc failed\n",
sc->sc_if.if_xname);
}
error = ENOBUFS;
}
s = splnet();
sc->sc_flags &= ~SC_DECOMP_RUN;
splx(s);
}
return (error);
}
if (sc->sc_flags & SC_DEBUG) {
printf("%s: no compressor for [%x %x %x], %x\n",
sc->sc_if.if_xname, ccp_option[0], ccp_option[1],
ccp_option[2], nb);
}
return (EINVAL); /* no handler found */
#endif /* PPP_COMPRESS */
case PPPIOCGNPMODE:
case PPPIOCSNPMODE:
npi = (struct npioctl *)data;
switch (npi->protocol) {
case PPP_IP:
npx = NP_IP;
break;
#ifdef INET6
case PPP_IPV6:
npx = NP_IPV6;
break;
#endif
default:
return EINVAL;
}
if (cmd == PPPIOCGNPMODE) {
npi->mode = sc->sc_npmode[npx];
} else {
if ((error = suser(p)) != 0)
return (error);
if (npi->mode != sc->sc_npmode[npx]) {
sc->sc_npmode[npx] = npi->mode;
if (npi->mode != NPMODE_QUEUE) {
ppp_requeue(sc);
(*sc->sc_start)(sc);
}
}
}
break;
case PPPIOCGIDLE:
t = getuptime();
((struct ppp_idle *)data)->xmit_idle = t - sc->sc_last_sent;
((struct ppp_idle *)data)->recv_idle = t - sc->sc_last_recv;
break;
#if NBPFILTER > 0
case PPPIOCSPASS:
case PPPIOCSACTIVE:
nbp = (struct bpf_program *) data;
if ((unsigned) nbp->bf_len > BPF_MAXINSNS)
return EINVAL;
newcodelen = nbp->bf_len * sizeof(struct bpf_insn);
if (nbp->bf_len != 0) {
newcode = mallocarray(nbp->bf_len,
sizeof(struct bpf_insn), M_DEVBUF, M_WAITOK);
if ((error = copyin((caddr_t)nbp->bf_insns,
(caddr_t)newcode, newcodelen)) != 0) {
free(newcode, M_DEVBUF, 0);
return error;
}
if (!bpf_validate(newcode, nbp->bf_len)) {
free(newcode, M_DEVBUF, 0);
return EINVAL;
}
} else
newcode = 0;
bp = (cmd == PPPIOCSPASS) ?
&sc->sc_pass_filt : &sc->sc_active_filt;
oldcode = bp->bf_insns;
s = splnet();
bp->bf_len = nbp->bf_len;
bp->bf_insns = newcode;
splx(s);
if (oldcode != 0)
free(oldcode, M_DEVBUF, 0);
break;
#endif
default:
return (-1);
}
return (0);
}
/*
* Process an ioctl request to the ppp network interface.
*/
static int
pppsioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
{
struct ppp_softc *sc = ifp->if_softc;
struct ifaddr *ifa = (struct ifaddr *)data;
struct ifreq *ifr = (struct ifreq *)data;
struct ppp_stats *psp;
#ifdef PPP_COMPRESS
struct ppp_comp_stats *pcp;
#endif
int s = splnet(), error = 0;
switch (cmd) {
case SIOCSIFFLAGS:
if ((ifp->if_flags & IFF_RUNNING) == 0)
ifp->if_flags &= ~IFF_UP;
break;
case SIOCSIFADDR:
case SIOCSIFDSTADDR:
switch (ifa->ifa_addr->sa_family) {
case AF_INET:
break;
#ifdef INET6
case AF_INET6:
break;
#endif
default:
error = EAFNOSUPPORT;
break;
}
break;
case SIOCSIFMTU:
sc->sc_if.if_mtu = ifr->ifr_mtu;
break;
case SIOCADDMULTI:
case SIOCDELMULTI:
break;
case SIOCGPPPSTATS:
psp = &((struct ifpppstatsreq *) data)->stats;
bzero(psp, sizeof(*psp));
psp->p = sc->sc_stats;
#if defined(VJC) && !defined(SL_NO_STATS)
if (sc->sc_comp) {
psp->vj.vjs_packets = sc->sc_comp->sls_packets;
psp->vj.vjs_compressed = sc->sc_comp->sls_compressed;
psp->vj.vjs_searches = sc->sc_comp->sls_searches;
psp->vj.vjs_misses = sc->sc_comp->sls_misses;
psp->vj.vjs_uncompressedin =
sc->sc_comp->sls_uncompressedin;
psp->vj.vjs_compressedin =
sc->sc_comp->sls_compressedin;
psp->vj.vjs_errorin = sc->sc_comp->sls_errorin;
psp->vj.vjs_tossed = sc->sc_comp->sls_tossed;
}
#endif /* VJC */
break;
#ifdef PPP_COMPRESS
case SIOCGPPPCSTATS:
pcp = &((struct ifpppcstatsreq *) data)->stats;
bzero(pcp, sizeof(*pcp));
if (sc->sc_xc_state != NULL)
(*sc->sc_xcomp->comp_stat)(sc->sc_xc_state, &pcp->c);
if (sc->sc_rc_state != NULL)
(*sc->sc_rcomp->decomp_stat)(sc->sc_rc_state, &pcp->d);
break;
#endif /* PPP_COMPRESS */
default:
error = ENOTTY;
}
splx(s);
return (error);
}
/*
* Queue a packet. Start transmission if not active.
* Packet is placed in Information field of PPP frame.
*/
int
pppoutput(struct ifnet *ifp, struct mbuf *m0, struct sockaddr *dst,
struct rtentry *rtp)
{
struct ppp_softc *sc = ifp->if_softc;
int protocol, address, control;
u_char *cp;
int error;
enum NPmode mode;
int len;
if (sc->sc_devp == NULL || (ifp->if_flags & IFF_RUNNING) == 0
|| ((ifp->if_flags & IFF_UP) == 0 && dst->sa_family != AF_UNSPEC)) {
error = ENETDOWN; /* sort of */
goto bad;
}
#ifdef DIAGNOSTIC
if (ifp->if_rdomain != rtable_l2(m0->m_pkthdr.ph_rtableid)) {
printf("%s: trying to send packet on wrong domain. "
"if %d vs. mbuf %d, AF %d\n", ifp->if_xname,
ifp->if_rdomain, rtable_l2(m0->m_pkthdr.ph_rtableid),
dst->sa_family);
}
#endif
/*
* Compute PPP header.
*/
switch (dst->sa_family) {
case AF_INET:
address = PPP_ALLSTATIONS;
control = PPP_UI;
protocol = PPP_IP;
mode = sc->sc_npmode[NP_IP];
break;
#ifdef INET6
case AF_INET6:
address = PPP_ALLSTATIONS;
control = PPP_UI;
protocol = PPP_IPV6;
mode = sc->sc_npmode[NP_IPV6];
break;
#endif
case AF_UNSPEC:
address = PPP_ADDRESS(dst->sa_data);
control = PPP_CONTROL(dst->sa_data);
protocol = PPP_PROTOCOL(dst->sa_data);
mode = NPMODE_PASS;
break;
default:
printf("%s: af%d not supported\n", ifp->if_xname,
dst->sa_family);
error = EAFNOSUPPORT;
goto bad;
}
/*
* Drop this packet, or return an error, if necessary.
*/
if (mode == NPMODE_ERROR) {
error = ENETDOWN;
goto bad;
}
if (mode == NPMODE_DROP) {
error = 0;
goto bad;
}
/*
* Add PPP header. If no space in first mbuf, allocate another.
*/
M_PREPEND(m0, PPP_HDRLEN, M_DONTWAIT);
if (m0 == NULL) {
error = ENOBUFS;
goto bad;
}
cp = mtod(m0, u_char *);
*cp++ = address;
*cp++ = control;
*cp++ = protocol >> 8;
*cp++ = protocol & 0xff;
if ((m0->m_flags & M_PKTHDR) == 0)
panic("mbuf packet without packet header!");
len = m0->m_pkthdr.len;
if (sc->sc_flags & SC_LOG_OUTPKT) {
printf("%s output: ", ifp->if_xname);
pppdumpm(m0);
}
if ((protocol & 0x8000) == 0) {
#if NBPFILTER > 0
/*
* Apply the pass and active filters to the packet,
* but only if it is a data packet.
*/
*mtod(m0, u_char *) = 1; /* indicates outbound */
if (sc->sc_pass_filt.bf_insns != 0 &&
bpf_filter(sc->sc_pass_filt.bf_insns, (u_char *)m0,
len, 0) == 0) {
error = 0; /* drop this packet */
goto bad;
}
/*
* Update the time we sent the most recent packet.
*/
if (sc->sc_active_filt.bf_insns == 0 ||
bpf_filter(sc->sc_active_filt.bf_insns, (u_char *)m0,
len, 0))
sc->sc_last_sent = getuptime();
*mtod(m0, u_char *) = address;
#else
/*
* Update the time we sent the most recent packet.
*/
sc->sc_last_sent = getuptime();
#endif
}
#if NBPFILTER > 0
/* See if bpf wants to look at the packet. */
if (ifp->if_bpf)
bpf_mtap(ifp->if_bpf, m0, BPF_DIRECTION_OUT);
#endif
/*
* Put the packet on the appropriate queue.
*/
if (mode == NPMODE_QUEUE) {
/* XXX we should limit the number of packets on this queue */
ml_enqueue(&sc->sc_npqueue, m0);
} else {
error = ifq_enqueue(&sc->sc_if.if_snd, m0);
if (error) {
sc->sc_if.if_oerrors++;
sc->sc_stats.ppp_oerrors++;
return (error);
}
(*sc->sc_start)(sc);
}
ifp->if_opackets++;
ifp->if_obytes += len;
return (0);
bad:
m_freem(m0);
return (error);
}
/*
* After a change in the NPmode for some NP, move packets from the
* npqueue to the send queue or the fast queue as appropriate.
*/
static void
ppp_requeue(struct ppp_softc *sc)
{
struct mbuf_list ml = MBUF_LIST_INITIALIZER();
struct mbuf *m;
enum NPmode mode;
int error;
while ((m = ml_dequeue(&sc->sc_npqueue)) != NULL) {
switch (PPP_PROTOCOL(mtod(m, u_char *))) {
case PPP_IP:
mode = sc->sc_npmode[NP_IP];
break;
#ifdef INET6
case PPP_IPV6:
mode = sc->sc_npmode[NP_IPV6];
break;
#endif
default:
mode = NPMODE_PASS;
}
switch (mode) {
case NPMODE_PASS:
error = ifq_enqueue(&sc->sc_if.if_snd, m);
if (error) {
sc->sc_if.if_oerrors++;
sc->sc_stats.ppp_oerrors++;
}
break;
case NPMODE_DROP:
case NPMODE_ERROR:
m_freem(m);
break;
case NPMODE_QUEUE:
ml_enqueue(&ml, m);
break;
}
}
sc->sc_npqueue = ml;
}
/*
* Transmitter has finished outputting some stuff;
*/
void
ppp_restart(struct ppp_softc *sc)
{
int s = splnet();
sc->sc_flags &= ~SC_TBUSY;
schednetisr(NETISR_PPP);
splx(s);
}
/*
* Get a packet to send.
*/
struct mbuf *
ppp_dequeue(struct ppp_softc *sc)
{
struct mbuf *m, *mp;
u_char *cp;
int address, control, protocol;
/*
* Grab a packet to send: first try the fast queue, then the
* normal queue.
*/
m = ifq_dequeue(&sc->sc_if.if_snd);
if (m == NULL)
return NULL;
++sc->sc_stats.ppp_opackets;
/*
* Extract the ppp header of the new packet.
* The ppp header will be in one mbuf.
*/
cp = mtod(m, u_char *);
address = PPP_ADDRESS(cp);
control = PPP_CONTROL(cp);
protocol = PPP_PROTOCOL(cp);
switch (protocol) {
case PPP_IP:
#ifdef VJC
/*
* If the packet is a TCP/IP packet, see if we can compress it.
*/
if ((sc->sc_flags & SC_COMP_TCP) && sc->sc_comp != NULL) {
struct ip *ip;
int type;
mp = m;
ip = (struct ip *)(cp + PPP_HDRLEN);
if (mp->m_len <= PPP_HDRLEN) {
mp = mp->m_next;
if (mp == NULL)
break;
ip = mtod(mp, struct ip *);
}
/*
* this code assumes the IP/TCP header is in one
* non-shared mbuf.
*/
if (ip->ip_p == IPPROTO_TCP) {
type = sl_compress_tcp(mp, ip, sc->sc_comp,
!(sc->sc_flags & SC_NO_TCP_CCID));
switch (type) {
case TYPE_UNCOMPRESSED_TCP:
protocol = PPP_VJC_UNCOMP;
break;
case TYPE_COMPRESSED_TCP:
protocol = PPP_VJC_COMP;
cp = mtod(m, u_char *);
cp[0] = address; /* header has moved */
cp[1] = control;
cp[2] = 0;
break;
}
/* update protocol in PPP header */
cp[3] = protocol;
}
}
#endif /* VJC */
break;
#ifdef PPP_COMPRESS
case PPP_CCP:
ppp_ccp(sc, m, 0);
break;
#endif /* PPP_COMPRESS */
}
#ifdef PPP_COMPRESS
if (protocol != PPP_LCP && protocol != PPP_CCP &&
sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) {
struct mbuf *mcomp = NULL;
int slen;
slen = 0;
for (mp = m; mp != NULL; mp = mp->m_next)
slen += mp->m_len;
(*sc->sc_xcomp->compress)(sc->sc_xc_state, &mcomp, m, slen,
(sc->sc_flags & SC_CCP_UP ?
sc->sc_if.if_mtu + PPP_HDRLEN : 0));
if (mcomp != NULL) {
if (sc->sc_flags & SC_CCP_UP) {
/* Send the compressed packet instead. */
m_freem(m);
m = mcomp;
cp = mtod(m, u_char *);
protocol = cp[3];
} else {
/*
* Can't transmit compressed packets until
* CCP is up.
*/
m_freem(mcomp);
}
}
}
#endif /* PPP_COMPRESS */
/*
* Compress the address/control and protocol, if possible.
*/
if (sc->sc_flags & SC_COMP_AC && address == PPP_ALLSTATIONS &&
control == PPP_UI && protocol != PPP_ALLSTATIONS &&
protocol != PPP_LCP) {
/* can compress address/control */
m->m_data += 2;
m->m_len -= 2;
}
if (sc->sc_flags & SC_COMP_PROT && protocol < 0xFF) {
/* can compress protocol */
if (mtod(m, u_char *) == cp) {
cp[2] = cp[1]; /* move address/control up */
cp[1] = cp[0];
}
++m->m_data;
--m->m_len;
}
return m;
}
/*
* Software interrupt routine.
*/
void
pppintr(void)
{
struct ppp_softc *sc;
int s;
struct ppp_pkt *pkt;
struct mbuf *m;
NET_ASSERT_LOCKED();
LIST_FOREACH(sc, &ppp_softc_list, sc_list) {
if (!(sc->sc_flags & SC_TBUSY) &&
(!ifq_empty(&sc->sc_if.if_snd))) {
s = splnet();
sc->sc_flags |= SC_TBUSY;
splx(s);
(*sc->sc_start)(sc);
}
while ((pkt = ppp_pkt_dequeue(&sc->sc_rawq)) != NULL) {
m = ppp_pkt_mbuf(pkt);
if (m == NULL)
continue;
ppp_inproc(sc, m);
}
}
}
#ifdef PPP_COMPRESS
/*
* Handle a CCP packet. `rcvd' is 1 if the packet was received,
* 0 if it is about to be transmitted.
*/
static void
ppp_ccp(struct ppp_softc *sc, struct mbuf *m, int rcvd)
{
u_char *dp, *ep;
struct mbuf *mp;
int slen, s;
/*
* Get a pointer to the data after the PPP header.
*/
if (m->m_len <= PPP_HDRLEN) {
mp = m->m_next;
if (mp == NULL)
return;
dp = mtod(mp, u_char *);
} else {
mp = m;
dp = mtod(mp, u_char *) + PPP_HDRLEN;
}
ep = mtod(mp, u_char *) + mp->m_len;
if (dp + CCP_HDRLEN > ep)
return;
slen = CCP_LENGTH(dp);
if (dp + slen > ep) {
if (sc->sc_flags & SC_DEBUG) {
printf("if_ppp/ccp: not enough data in mbuf"
" (%p+%x > %p+%x)\n", dp, slen,
mtod(mp, u_char *), mp->m_len);
}
return;
}
switch (CCP_CODE(dp)) {
case CCP_CONFREQ:
case CCP_TERMREQ:
case CCP_TERMACK:
/* CCP must be going down - disable compression */
if (sc->sc_flags & SC_CCP_UP) {
s = splnet();
sc->sc_flags &=
~(SC_CCP_UP | SC_COMP_RUN | SC_DECOMP_RUN);
splx(s);
}
break;
case CCP_CONFACK:
if (sc->sc_flags & SC_CCP_OPEN &&
!(sc->sc_flags & SC_CCP_UP) &&
slen >= CCP_HDRLEN + CCP_OPT_MINLEN &&
slen >= CCP_OPT_LENGTH(dp + CCP_HDRLEN) + CCP_HDRLEN) {
if (!rcvd) {
/* we're agreeing to send compressed packets. */
if (sc->sc_xc_state != NULL &&
(*sc->sc_xcomp->comp_init)(sc->sc_xc_state,
dp + CCP_HDRLEN, slen - CCP_HDRLEN,
sc->sc_unit, 0, sc->sc_flags & SC_DEBUG)) {
s = splnet();
sc->sc_flags |= SC_COMP_RUN;
splx(s);
}
} else {
/* peer agrees to send compressed packets */
if (sc->sc_rc_state != NULL &&
(*sc->sc_rcomp->decomp_init)(
sc->sc_rc_state, dp + CCP_HDRLEN,
slen - CCP_HDRLEN, sc->sc_unit, 0,
sc->sc_mru, sc->sc_flags & SC_DEBUG)) {
s = splnet();
sc->sc_flags |= SC_DECOMP_RUN;
sc->sc_flags &=
~(SC_DC_ERROR | SC_DC_FERROR);
splx(s);
}
}
}
break;
case CCP_RESETACK:
if (sc->sc_flags & SC_CCP_UP) {
if (!rcvd) {
if (sc->sc_xc_state &&
(sc->sc_flags & SC_COMP_RUN)) {
(*sc->sc_xcomp->comp_reset)(
sc->sc_xc_state);
}
} else {
if (sc->sc_rc_state &&
(sc->sc_flags & SC_DECOMP_RUN)) {
(*sc->sc_rcomp->decomp_reset)(
sc->sc_rc_state);
s = splnet();
sc->sc_flags &= ~SC_DC_ERROR;
splx(s);
}
}
}
break;
}
}
/*
* CCP is down; free (de)compressor state if necessary.
*/
static void
ppp_ccp_closed(struct ppp_softc *sc)
{
if (sc->sc_xc_state) {
(*sc->sc_xcomp->comp_free)(sc->sc_xc_state);
sc->sc_xc_state = NULL;
}
if (sc->sc_rc_state) {
(*sc->sc_rcomp->decomp_free)(sc->sc_rc_state);
sc->sc_rc_state = NULL;
}
}
#endif /* PPP_COMPRESS */
/*
* PPP packet input routine.
* The caller has checked and removed the FCS and has inserted
* the address/control bytes and the protocol high byte if they
* were omitted.
*/
void
ppppktin(struct ppp_softc *sc, struct ppp_pkt *pkt, int lost)
{
pkt->p_hdr.ph_errmark = lost;
if (ppp_pkt_enqueue(&sc->sc_rawq, pkt) == 0)
schednetisr(NETISR_PPP);
}
/*
* Process a received PPP packet, doing decompression as necessary.
*/
#define COMPTYPE(proto) ((proto) == PPP_VJC_COMP? TYPE_COMPRESSED_TCP: \
TYPE_UNCOMPRESSED_TCP)
static void
ppp_inproc(struct ppp_softc *sc, struct mbuf *m)
{
struct ifnet *ifp = &sc->sc_if;
int s, ilen, xlen, proto, rv;
u_char *cp, adrs, ctrl;
struct mbuf *mp, *dmp = NULL;
u_char *iphdr;
u_int hlen;
sc->sc_stats.ppp_ipackets++;
if (sc->sc_flags & SC_LOG_INPKT) {
ilen = 0;
for (mp = m; mp != NULL; mp = mp->m_next)
ilen += mp->m_len;
printf("%s: got %d bytes\n", ifp->if_xname, ilen);
pppdumpm(m);
}
cp = mtod(m, u_char *);
adrs = PPP_ADDRESS(cp);
ctrl = PPP_CONTROL(cp);
proto = PPP_PROTOCOL(cp);
if (m->m_flags & M_ERRMARK) {
m->m_flags &= ~M_ERRMARK;
s = splnet();
sc->sc_flags |= SC_VJ_RESET;
splx(s);
}
#ifdef PPP_COMPRESS
/*
* Decompress this packet if necessary, update the receiver's
* dictionary, or take appropriate action on a CCP packet.
*/
if (proto == PPP_COMP && sc->sc_rc_state &&
(sc->sc_flags & SC_DECOMP_RUN) && !(sc->sc_flags & SC_DC_ERROR) &&
!(sc->sc_flags & SC_DC_FERROR)) {
/* decompress this packet */
rv = (*sc->sc_rcomp->decompress)(sc->sc_rc_state, m, &dmp);
if (rv == DECOMP_OK) {
m_freem(m);
if (dmp == NULL) {
/*
* no error, but no decompressed packet
* produced
*/
return;
}
m = dmp;
cp = mtod(m, u_char *);
proto = PPP_PROTOCOL(cp);
} else {
/*
* An error has occurred in decompression.
* Pass the compressed packet up to pppd, which may
* take CCP down or issue a Reset-Req.
*/
if (sc->sc_flags & SC_DEBUG) {
printf("%s: decompress failed %d\n",
ifp->if_xname, rv);
}
s = splnet();
sc->sc_flags |= SC_VJ_RESET;
if (rv == DECOMP_ERROR)
sc->sc_flags |= SC_DC_ERROR;
else
sc->sc_flags |= SC_DC_FERROR;
splx(s);
}
} else {
if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) {
(*sc->sc_rcomp->incomp)(sc->sc_rc_state, m);
}
if (proto == PPP_CCP) {
ppp_ccp(sc, m, 1);
}
}
#endif
ilen = 0;
for (mp = m; mp != NULL; mp = mp->m_next)
ilen += mp->m_len;
#ifdef VJC
if (sc->sc_flags & SC_VJ_RESET) {
/*
* If we've missed a packet, we must toss subsequent compressed
* packets which don't have an explicit connection ID.
*/
if (sc->sc_comp)
sl_uncompress_tcp(NULL, 0, TYPE_ERROR, sc->sc_comp);
s = splnet();
sc->sc_flags &= ~SC_VJ_RESET;
splx(s);
}
/*
* See if we have a VJ-compressed packet to uncompress.
*/
if (proto == PPP_VJC_COMP) {
if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0)
goto bad;
xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN,
m->m_len - PPP_HDRLEN, ilen - PPP_HDRLEN,
TYPE_COMPRESSED_TCP, sc->sc_comp, &iphdr, &hlen);
if (xlen <= 0) {
if (sc->sc_flags & SC_DEBUG) {
printf("%s: VJ uncompress failed "
"on type comp\n", ifp->if_xname);
}
goto bad;
}
/* Copy the PPP and IP headers into a new mbuf. */
MGETHDR(mp, M_DONTWAIT, MT_DATA);
if (mp == NULL)
goto bad;
mp->m_len = 0;
mp->m_next = NULL;
if (hlen + PPP_HDRLEN > MHLEN) {
MCLGET(mp, M_DONTWAIT);
if (m_trailingspace(mp) < hlen + PPP_HDRLEN) {
m_freem(mp);
/* lose if big headers and no clusters */
goto bad;
}
}
if (m->m_flags & M_PKTHDR)
M_MOVE_HDR(mp, m);
cp = mtod(mp, u_char *);
cp[0] = adrs;
cp[1] = ctrl;
cp[2] = 0;
cp[3] = PPP_IP;
proto = PPP_IP;
bcopy(iphdr, cp + PPP_HDRLEN, hlen);
mp->m_len = hlen + PPP_HDRLEN;
/*
* Trim the PPP and VJ headers off the old mbuf
* and stick the new and old mbufs together.
*/
m->m_data += PPP_HDRLEN + xlen;
m->m_len -= PPP_HDRLEN + xlen;
if (m->m_len <= m_trailingspace(mp)) {
bcopy(mtod(m, u_char *),
mtod(mp, u_char *) + mp->m_len, m->m_len);
mp->m_len += m->m_len;
mp->m_next = m_free(m);
} else
mp->m_next = m;
m = mp;
ilen += hlen - xlen;
} else if (proto == PPP_VJC_UNCOMP) {
if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0)
goto bad;
xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN,
m->m_len - PPP_HDRLEN, ilen - PPP_HDRLEN,
TYPE_UNCOMPRESSED_TCP, sc->sc_comp, &iphdr, &hlen);
if (xlen < 0) {
if (sc->sc_flags & SC_DEBUG) {
printf("%s: VJ uncompress failed "
"on type uncomp\n", ifp->if_xname);
}
goto bad;
}
proto = PPP_IP;
cp[3] = PPP_IP;
}
#endif /* VJC */
m->m_pkthdr.len = ilen;
m->m_pkthdr.ph_ifidx = ifp->if_index;
/* mark incoming routing table */
m->m_pkthdr.ph_rtableid = ifp->if_rdomain;
if ((proto & 0x8000) == 0) {
#if NBPFILTER > 0
/*
* See whether we want to pass this packet, and
* if it counts as link activity.
*/
adrs = *mtod(m, u_char *); /* save address field */
*mtod(m, u_char *) = 0; /* indicate inbound */
if (sc->sc_pass_filt.bf_insns != 0 &&
bpf_filter(sc->sc_pass_filt.bf_insns, (u_char *) m,
ilen, 0) == 0) {
/* drop this packet */
m_freem(m);
return;
}
if (sc->sc_active_filt.bf_insns == 0 ||
bpf_filter(sc->sc_active_filt.bf_insns, (u_char *)m,
ilen, 0))
sc->sc_last_recv = getuptime();
*mtod(m, u_char *) = adrs;
#else
/*
* Record the time that we received this packet.
*/
sc->sc_last_recv = getuptime();
#endif
}
#if NBPFILTER > 0
/* See if bpf wants to look at the packet. */
if (ifp->if_bpf)
bpf_mtap(ifp->if_bpf, m, BPF_DIRECTION_IN);
#endif
rv = 0;
switch (proto) {
case PPP_IP:
/*
* IP packet - take off the ppp header and pass it up to IP.
*/
if ((ifp->if_flags & IFF_UP) == 0 ||
sc->sc_npmode[NP_IP] != NPMODE_PASS) {
/* interface is down - drop the packet. */
m_freem(m);
return;
}
m->m_pkthdr.len -= PPP_HDRLEN;
m->m_data += PPP_HDRLEN;
m->m_len -= PPP_HDRLEN;
ipv4_input(ifp, m);
rv = 1;
break;
#ifdef INET6
case PPP_IPV6:
/*
* IPv6 packet - take off the ppp header and pass it up to IPv6.
*/
if ((ifp->if_flags & IFF_UP) == 0 ||
sc->sc_npmode[NP_IPV6] != NPMODE_PASS) {
/* interface is down - drop the packet. */
m_freem(m);
return;
}
m->m_pkthdr.len -= PPP_HDRLEN;
m->m_data += PPP_HDRLEN;
m->m_len -= PPP_HDRLEN;
ipv6_input(ifp, m);
rv = 1;
break;
#endif
default:
/*
* Some other protocol - place on input queue for read().
*/
if (mq_enqueue(&sc->sc_inq, m) != 0) {
if_congestion();
rv = 0; /* failure */
} else
rv = 2; /* input queue */
break;
}
if (rv == 0) {
/* failure */
if (sc->sc_flags & SC_DEBUG)
printf("%s: input queue full\n", ifp->if_xname);
ifp->if_iqdrops++;
goto dropped;
}
ifp->if_ipackets++;
ifp->if_ibytes += ilen;
if (rv == 2)
(*sc->sc_ctlp)(sc);
return;
bad:
m_freem(m);
dropped:
sc->sc_if.if_ierrors++;
sc->sc_stats.ppp_ierrors++;
}
#define MAX_DUMP_BYTES 128
static void
pppdumpm(struct mbuf *m0)
{
char buf[3*MAX_DUMP_BYTES+4];
char *bp = buf;
struct mbuf *m;
static char digits[] = "0123456789abcdef";
for (m = m0; m; m = m->m_next) {
int l = m->m_len;
u_char *rptr = mtod(m, u_char *);
while (l--) {
if (bp > buf + sizeof(buf) - 4)
goto done;
/* convert byte to ascii hex */
*bp++ = digits[*rptr >> 4];
*bp++ = digits[*rptr++ & 0xf];
}
if (m->m_next) {
if (bp > buf + sizeof(buf) - 3)
goto done;
*bp++ = '|';
} else
*bp++ = ' ';
}
done:
if (m)
*bp++ = '>';
*bp = 0;
printf("%s\n", buf);
}
static void
ppp_ifstart(struct ifnet *ifp)
{
struct ppp_softc *sc;
sc = ifp->if_softc;
(*sc->sc_start)(sc);
}
void
ppp_pkt_list_init(struct ppp_pkt_list *pl, u_int limit)
{
mtx_init(&pl->pl_mtx, IPL_TTY);
pl->pl_head = pl->pl_tail = NULL;
pl->pl_count = 0;
pl->pl_limit = limit;
}
int
ppp_pkt_enqueue(struct ppp_pkt_list *pl, struct ppp_pkt *pkt)
{
int drop = 0;
mtx_enter(&pl->pl_mtx);
if (pl->pl_count < pl->pl_limit) {
if (pl->pl_tail == NULL)
pl->pl_head = pl->pl_tail = pkt;
else {
PKT_NEXTPKT(pl->pl_tail) = pkt;
pl->pl_tail = pkt;
}
PKT_NEXTPKT(pkt) = NULL;
pl->pl_count++;
} else
drop = 1;
mtx_leave(&pl->pl_mtx);
if (drop)
ppp_pkt_free(pkt);
return (drop);
}
struct ppp_pkt *
ppp_pkt_dequeue(struct ppp_pkt_list *pl)
{
struct ppp_pkt *pkt;
mtx_enter(&pl->pl_mtx);
pkt = pl->pl_head;
if (pkt != NULL) {
pl->pl_head = PKT_NEXTPKT(pkt);
if (pl->pl_head == NULL)
pl->pl_tail = NULL;
pl->pl_count--;
}
mtx_leave(&pl->pl_mtx);
return (pkt);
}
struct mbuf *
ppp_pkt_mbuf(struct ppp_pkt *pkt0)
{
extern struct pool ppp_pkts;
struct mbuf *m0 = NULL, **mp = &m0, *m;
struct ppp_pkt *pkt = pkt0;
size_t len = 0;
do {
MGETHDR(m, M_DONTWAIT, MT_DATA);
if (m == NULL)
goto fail;
MEXTADD(m, pkt, sizeof(*pkt), M_EXTWR,
MEXTFREE_POOL, &ppp_pkts);
m->m_data += sizeof(pkt->p_hdr);
m->m_len = PKT_LEN(pkt);
len += m->m_len;
*mp = m;
mp = &m->m_next;
pkt = PKT_NEXT(pkt);
} while (pkt != NULL);
m0->m_pkthdr.len = len;
if (pkt0->p_hdr.ph_errmark)
m0->m_flags |= M_ERRMARK;
return (m0);
fail:
m_freem(m0);
ppp_pkt_free(pkt0);
return (NULL);
}
#endif /* NPPP > 0 */
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