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HardenedBSD/usr.sbin/ppp/mp.c
Warner Losh b3e7694832 Remove $FreeBSD$: two-line .h pattern 
Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/
2023-08-16 11:54:16 -06:00

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/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 1998 Brian Somers <brian@Awfulhak.org>
* 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/param.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <arpa/inet.h>
#include <net/if_dl.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <errno.h>
#include <paths.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <termios.h>
#include <unistd.h>
#include "layer.h"
#ifndef NONAT
#include "nat_cmd.h"
#endif
#include "vjcomp.h"
#include "ua.h"
#include "defs.h"
#include "command.h"
#include "mbuf.h"
#include "log.h"
#include "timer.h"
#include "fsm.h"
#include "iplist.h"
#include "throughput.h"
#include "slcompress.h"
#include "lqr.h"
#include "hdlc.h"
#include "ncpaddr.h"
#include "ipcp.h"
#include "auth.h"
#include "lcp.h"
#include "async.h"
#include "ccp.h"
#include "link.h"
#include "descriptor.h"
#include "physical.h"
#include "chat.h"
#include "proto.h"
#include "filter.h"
#include "mp.h"
#include "chap.h"
#include "cbcp.h"
#include "datalink.h"
#ifndef NORADIUS
#include "radius.h"
#endif
#include "ipv6cp.h"
#include "ncp.h"
#include "bundle.h"
#include "prompt.h"
#include "id.h"
#include "arp.h"
void
peerid_Init(struct peerid *peer)
{
peer->enddisc.class = 0;
*peer->enddisc.address = '\0';
peer->enddisc.len = 0;
*peer->authname = '\0';
}
int
peerid_Equal(const struct peerid *p1, const struct peerid *p2)
{
return !strcmp(p1->authname, p2->authname) &&
p1->enddisc.class == p2->enddisc.class &&
p1->enddisc.len == p2->enddisc.len &&
!memcmp(p1->enddisc.address, p2->enddisc.address, p1->enddisc.len);
}
static u_int32_t
inc_seq(unsigned is12bit, u_int32_t seq)
{
seq++;
if (is12bit) {
if (seq & 0xfffff000)
seq = 0;
} else if (seq & 0xff000000)
seq = 0;
return seq;
}
static int
isbefore(unsigned is12bit, u_int32_t seq1, u_int32_t seq2)
{
u_int32_t max = (is12bit ? 0xfff : 0xffffff) - 0x200;
if (seq1 > max) {
if (seq2 < 0x200 || seq2 > seq1)
return 1;
} else if ((seq1 > 0x200 || seq2 <= max) && seq1 < seq2)
return 1;
return 0;
}
static int
mp_ReadHeader(struct mp *mp, struct mbuf *m, struct mp_header *header)
{
if (mp->local_is12bit) {
u_int16_t val;
ua_ntohs(MBUF_CTOP(m), &val);
if (val & 0x3000) {
log_Printf(LogWARN, "Oops - MP header without required zero bits\n");
return 0;
}
header->begin = val & 0x8000 ? 1 : 0;
header->end = val & 0x4000 ? 1 : 0;
header->seq = val & 0x0fff;
return 2;
} else {
ua_ntohl(MBUF_CTOP(m), &header->seq);
if (header->seq & 0x3f000000) {
log_Printf(LogWARN, "Oops - MP header without required zero bits\n");
return 0;
}
header->begin = header->seq & 0x80000000 ? 1 : 0;
header->end = header->seq & 0x40000000 ? 1 : 0;
header->seq &= 0x00ffffff;
return 4;
}
}
static void
mp_LayerStart(void *v __unused, struct fsm *fp __unused)
{
/* The given FSM (ccp) is about to start up ! */
}
static void
mp_LayerUp(void *v __unused, struct fsm *fp)
{
/* The given fsm (ccp) is now up */
bundle_CalculateBandwidth(fp->bundle); /* Against ccp_MTUOverhead */
}
static void
mp_LayerDown(void *v __unused, struct fsm *fp __unused)
{
/* The given FSM (ccp) has been told to come down */
}
static void
mp_LayerFinish(void *v __unused, struct fsm *fp)
{
/* The given fsm (ccp) is now down */
if (fp->state == ST_CLOSED && fp->open_mode == OPEN_PASSIVE)
fsm_Open(fp); /* CCP goes to ST_STOPPED */
}
static void
mp_UpDown(void *v)
{
struct mp *mp = (struct mp *)v;
int percent;
percent = MAX(mp->link.stats.total.in.OctetsPerSecond,
mp->link.stats.total.out.OctetsPerSecond) * 800 /
mp->bundle->bandwidth;
if (percent >= mp->cfg.autoload.max) {
log_Printf(LogDEBUG, "%d%% saturation - bring a link up ?\n", percent);
bundle_AutoAdjust(mp->bundle, percent, AUTO_UP);
} else if (percent <= mp->cfg.autoload.min) {
log_Printf(LogDEBUG, "%d%% saturation - bring a link down ?\n", percent);
bundle_AutoAdjust(mp->bundle, percent, AUTO_DOWN);
}
}
void
mp_StopAutoloadTimer(struct mp *mp)
{
throughput_stop(&mp->link.stats.total);
}
void
mp_CheckAutoloadTimer(struct mp *mp)
{
if (mp->link.stats.total.SamplePeriod != mp->cfg.autoload.period) {
throughput_destroy(&mp->link.stats.total);
throughput_init(&mp->link.stats.total, mp->cfg.autoload.period);
throughput_callback(&mp->link.stats.total, mp_UpDown, mp);
}
if (bundle_WantAutoloadTimer(mp->bundle))
throughput_start(&mp->link.stats.total, "MP throughput", 1);
else
mp_StopAutoloadTimer(mp);
}
void
mp_RestartAutoloadTimer(struct mp *mp)
{
if (mp->link.stats.total.SamplePeriod != mp->cfg.autoload.period)
mp_CheckAutoloadTimer(mp);
else
throughput_clear(&mp->link.stats.total, THROUGHPUT_OVERALL, NULL);
}
void
mp_Init(struct mp *mp, struct bundle *bundle)
{
mp->peer_is12bit = mp->local_is12bit = 0;
mp->peer_mrru = mp->local_mrru = 0;
peerid_Init(&mp->peer);
mp->out.seq = 0;
mp->out.link = 0;
mp->out.af = AF_INET;
mp->seq.min_in = 0;
mp->seq.next_in = 0;
mp->inbufs = NULL;
mp->bundle = bundle;
mp->link.type = LOGICAL_LINK;
mp->link.name = "mp";
mp->link.len = sizeof *mp;
mp->cfg.autoload.period = SAMPLE_PERIOD;
mp->cfg.autoload.min = mp->cfg.autoload.max = 0;
throughput_init(&mp->link.stats.total, mp->cfg.autoload.period);
throughput_callback(&mp->link.stats.total, mp_UpDown, mp);
mp->link.stats.parent = NULL;
mp->link.stats.gather = 0; /* Let the physical links gather stats */
memset(mp->link.Queue, '\0', sizeof mp->link.Queue);
memset(mp->link.proto_in, '\0', sizeof mp->link.proto_in);
memset(mp->link.proto_out, '\0', sizeof mp->link.proto_out);
mp->fsmp.LayerStart = mp_LayerStart;
mp->fsmp.LayerUp = mp_LayerUp;
mp->fsmp.LayerDown = mp_LayerDown;
mp->fsmp.LayerFinish = mp_LayerFinish;
mp->fsmp.object = mp;
mpserver_Init(&mp->server);
mp->cfg.mrru = 0;
mp->cfg.shortseq = NEG_ENABLED|NEG_ACCEPTED;
mp->cfg.negenddisc = NEG_ENABLED|NEG_ACCEPTED;
mp->cfg.enddisc.class = 0;
*mp->cfg.enddisc.address = '\0';
mp->cfg.enddisc.len = 0;
lcp_Init(&mp->link.lcp, mp->bundle, &mp->link, NULL);
ccp_Init(&mp->link.ccp, mp->bundle, &mp->link, &mp->fsmp);
link_EmptyStack(&mp->link);
link_Stack(&mp->link, &protolayer);
link_Stack(&mp->link, &ccplayer);
link_Stack(&mp->link, &vjlayer);
#ifndef NONAT
link_Stack(&mp->link, &natlayer);
#endif
}
int
mp_Up(struct mp *mp, struct datalink *dl)
{
struct lcp *lcp = &dl->physical->link.lcp;
if (mp->active) {
/* We're adding a link - do a last validation on our parameters */
if (!peerid_Equal(&dl->peer, &mp->peer)) {
log_Printf(LogPHASE, "%s: Inappropriate peer !\n", dl->name);
log_Printf(LogPHASE, " Attached to peer %s/%s\n", mp->peer.authname,
mp_Enddisc(mp->peer.enddisc.class, mp->peer.enddisc.address,
mp->peer.enddisc.len));
log_Printf(LogPHASE, " New link is peer %s/%s\n", dl->peer.authname,
mp_Enddisc(dl->peer.enddisc.class, dl->peer.enddisc.address,
dl->peer.enddisc.len));
return MP_FAILED;
}
if (mp->local_mrru != lcp->want_mrru ||
mp->peer_mrru != lcp->his_mrru ||
mp->local_is12bit != lcp->want_shortseq ||
mp->peer_is12bit != lcp->his_shortseq) {
log_Printf(LogPHASE, "%s: Invalid MRRU/SHORTSEQ MP parameters !\n",
dl->name);
return MP_FAILED;
}
return MP_ADDED;
} else {
/* First link in multilink mode */
mp->local_mrru = lcp->want_mrru;
mp->peer_mrru = lcp->his_mrru;
mp->local_is12bit = lcp->want_shortseq;
mp->peer_is12bit = lcp->his_shortseq;
mp->peer = dl->peer;
throughput_destroy(&mp->link.stats.total);
throughput_init(&mp->link.stats.total, mp->cfg.autoload.period);
throughput_callback(&mp->link.stats.total, mp_UpDown, mp);
memset(mp->link.Queue, '\0', sizeof mp->link.Queue);
memset(mp->link.proto_in, '\0', sizeof mp->link.proto_in);
memset(mp->link.proto_out, '\0', sizeof mp->link.proto_out);
/* Tell the link who it belongs to */
dl->physical->link.stats.parent = &mp->link.stats.total;
mp->out.seq = 0;
mp->out.link = 0;
mp->out.af = AF_INET;
mp->seq.min_in = 0;
mp->seq.next_in = 0;
/*
* Now we create our server socket.
* If it already exists, join it. Otherwise, create and own it
*/
switch (mpserver_Open(&mp->server, &mp->peer)) {
case MPSERVER_CONNECTED:
log_Printf(LogPHASE, "mp: Transfer link on %s\n",
mp->server.socket.sun_path);
mp->server.send.dl = dl; /* Defer 'till it's safe to send */
return MP_LINKSENT;
case MPSERVER_FAILED:
return MP_FAILED;
case MPSERVER_LISTENING:
log_Printf(LogPHASE, "mp: Listening on %s\n", mp->server.socket.sun_path);
log_Printf(LogPHASE, " First link: %s\n", dl->name);
/* Re-point our NCP layers at our MP link */
ncp_SetLink(&mp->bundle->ncp, &mp->link);
/* Our lcp's already up 'cos of the NULL parent */
if (ccp_SetOpenMode(&mp->link.ccp)) {
fsm_Up(&mp->link.ccp.fsm);
fsm_Open(&mp->link.ccp.fsm);
}
mp->active = 1;
break;
}
}
return MP_UP;
}
void
mp_Down(struct mp *mp)
{
if (mp->active) {
struct mbuf *next;
/* Stop that ! */
mp_StopAutoloadTimer(mp);
/* Don't want any more of these */
mpserver_Close(&mp->server);
/* CCP goes down with a bang */
fsm2initial(&mp->link.ccp.fsm);
/* Received fragments go in the bit-bucket */
while (mp->inbufs) {
next = mp->inbufs->m_nextpkt;
m_freem(mp->inbufs);
mp->inbufs = next;
}
peerid_Init(&mp->peer);
mp->active = 0;
}
}
void
mp_linkInit(struct mp_link *mplink)
{
mplink->seq = 0;
mplink->bandwidth = 0;
}
static void
mp_Assemble(struct mp *mp, struct mbuf *m, struct physical *p)
{
struct mp_header mh, h;
struct mbuf *q, *last;
u_int32_t seq;
/*
* When `m' and `p' are NULL, it means our oldest link has gone down.
* We want to determine a new min, and process any intermediate stuff
* as normal
*/
if (m && mp_ReadHeader(mp, m, &mh) == 0) {
m_freem(m);
return;
}
if (p) {
seq = p->dl->mp.seq;
p->dl->mp.seq = mh.seq;
} else
seq = mp->seq.min_in;
if (mp->seq.min_in == seq) {
/*
* We've received new data on the link that has our min (oldest) seq.
* Figure out which link now has the smallest (oldest) seq.
*/
struct datalink *dl;
mp->seq.min_in = (u_int32_t)-1;
for (dl = mp->bundle->links; dl; dl = dl->next)
if (dl->state == DATALINK_OPEN &&
(mp->seq.min_in == (u_int32_t)-1 ||
isbefore(mp->local_is12bit, dl->mp.seq, mp->seq.min_in)))
mp->seq.min_in = dl->mp.seq;
}
/*
* Now process as many of our fragments as we can, adding our new
* fragment in as we go, and ordering with the oldest at the top of
* the queue.
*/
last = NULL;
seq = mp->seq.next_in;
q = mp->inbufs;
while (q || m) {
if (!q) {
if (last)
last->m_nextpkt = m;
else
mp->inbufs = m;
q = m;
m = NULL;
h = mh;
} else {
mp_ReadHeader(mp, q, &h);
if (m && isbefore(mp->local_is12bit, mh.seq, h.seq)) {
/* Our received fragment fits in before this one, so link it in */
if (last)
last->m_nextpkt = m;
else
mp->inbufs = m;
m->m_nextpkt = q;
q = m;
h = mh;
m = NULL;
}
}
if (h.seq != seq) {
/* we're missing something :-( */
if (isbefore(mp->local_is12bit, seq, mp->seq.min_in)) {
/* we're never gonna get it */
struct mbuf *next;
/* Zap all older fragments */
while (mp->inbufs != q) {
log_Printf(LogDEBUG, "Drop frag\n");
next = mp->inbufs->m_nextpkt;
m_freem(mp->inbufs);
mp->inbufs = next;
}
/*
* Zap everything until the next `end' fragment OR just before
* the next `begin' fragment OR 'till seq.min_in - whichever
* comes first.
*/
do {
mp_ReadHeader(mp, mp->inbufs, &h);
if (h.begin) {
/* We might be able to process this ! */
h.seq--; /* We're gonna look for fragment with h.seq+1 */
break;
}
next = mp->inbufs->m_nextpkt;
log_Printf(LogDEBUG, "Drop frag %u\n", h.seq);
m_freem(mp->inbufs);
mp->inbufs = next;
} while (mp->inbufs && (isbefore(mp->local_is12bit, mp->seq.min_in,
h.seq) || h.end));
/*
* Continue processing things from here.
* This deals with the possibility that we received a fragment
* on the slowest link that invalidates some of our data (because
* of the hole at `q'), but where there are subsequent `whole'
* packets that have already been received.
*/
mp->seq.next_in = seq = inc_seq(mp->local_is12bit, h.seq);
last = NULL;
q = mp->inbufs;
} else
/* we may still receive the missing fragment */
break;
} else if (h.end) {
/* We've got something, reassemble */
struct mbuf **frag = &q;
int len;
long long first = -1;
do {
*frag = mp->inbufs;
mp->inbufs = mp->inbufs->m_nextpkt;
len = mp_ReadHeader(mp, *frag, &h);
if (first == -1)
first = h.seq;
if (frag == &q && !h.begin) {
log_Printf(LogWARN, "Oops - MP frag %lu should have a begin flag\n",
(u_long)h.seq);
m_freem(q);
q = NULL;
} else if (frag != &q && h.begin) {
log_Printf(LogWARN, "Oops - MP frag %lu should have an end flag\n",
(u_long)h.seq - 1);
/*
* Stuff our fragment back at the front of the queue and zap
* our half-assembled packet.
*/
(*frag)->m_nextpkt = mp->inbufs;
mp->inbufs = *frag;
*frag = NULL;
m_freem(q);
q = NULL;
frag = &q;
h.end = 0; /* just in case it's a whole packet */
} else {
(*frag)->m_offset += len;
(*frag)->m_len -= len;
(*frag)->m_nextpkt = NULL;
do
frag = &(*frag)->m_next;
while (*frag != NULL);
}
} while (!h.end);
if (q) {
q = m_pullup(q);
log_Printf(LogDEBUG, "MP: Reassembled frags %lu-%lu, length %zd\n",
(u_long)first, (u_long)h.seq, m_length(q));
link_PullPacket(&mp->link, MBUF_CTOP(q), q->m_len, mp->bundle);
m_freem(q);
}
mp->seq.next_in = seq = inc_seq(mp->local_is12bit, h.seq);
last = NULL;
q = mp->inbufs;
} else {
/* Look for the next fragment */
seq = inc_seq(mp->local_is12bit, seq);
last = q;
q = q->m_nextpkt;
}
}
if (m) {
/* We still have to find a home for our new fragment */
last = NULL;
for (q = mp->inbufs; q; last = q, q = q->m_nextpkt) {
mp_ReadHeader(mp, q, &h);
if (isbefore(mp->local_is12bit, mh.seq, h.seq))
break;
}
/* Our received fragment fits in here */
if (last)
last->m_nextpkt = m;
else
mp->inbufs = m;
m->m_nextpkt = q;
}
}
struct mbuf *
mp_Input(struct bundle *bundle, struct link *l, struct mbuf *bp)
{
struct physical *p = link2physical(l);
if (!bundle->ncp.mp.active)
/* Let someone else deal with it ! */
return bp;
if (p == NULL) {
log_Printf(LogWARN, "DecodePacket: Can't do MP inside MP !\n");
m_freem(bp);
} else {
m_settype(bp, MB_MPIN);
mp_Assemble(&bundle->ncp.mp, bp, p);
}
return NULL;
}
static void
mp_Output(struct mp *mp, struct bundle *bundle, struct link *l,
struct mbuf *m, u_int32_t begin, u_int32_t end)
{
char prepend[4];
/* Stuff an MP header on the front of our packet and send it */
if (mp->peer_is12bit) {
u_int16_t val;
val = (begin << 15) | (end << 14) | (u_int16_t)mp->out.seq;
ua_htons(&val, prepend);
m = m_prepend(m, prepend, 2, 0);
} else {
u_int32_t val;
val = (begin << 31) | (end << 30) | (u_int32_t)mp->out.seq;
ua_htonl(&val, prepend);
m = m_prepend(m, prepend, 4, 0);
}
if (log_IsKept(LogDEBUG))
log_Printf(LogDEBUG, "MP[frag %d]: Send %zd bytes on link `%s'\n",
mp->out.seq, m_length(m), l->name);
mp->out.seq = inc_seq(mp->peer_is12bit, mp->out.seq);
if (l->ccp.fsm.state != ST_OPENED && ccp_Required(&l->ccp)) {
log_Printf(LogPHASE, "%s: Not transmitting... waiting for CCP\n", l->name);
return;
}
link_PushPacket(l, m, bundle, LINK_QUEUES(l) - 1, PROTO_MP);
}
int
mp_FillPhysicalQueues(struct bundle *bundle)
{
struct mp *mp = &bundle->ncp.mp;
struct datalink *dl, *fdl;
size_t total, add, len;
int thislink, nlinks, nopenlinks, sendasip;
u_int32_t begin, end;
struct mbuf *m, *mo;
struct link *bestlink;
thislink = nlinks = nopenlinks = 0;
for (fdl = NULL, dl = bundle->links; dl; dl = dl->next) {
/* Include non-open links here as mp->out.link will stay more correct */
if (!fdl) {
if (thislink == mp->out.link)
fdl = dl;
else
thislink++;
}
nlinks++;
if (dl->state == DATALINK_OPEN)
nopenlinks++;
}
if (!fdl) {
fdl = bundle->links;
if (!fdl)
return 0;
thislink = 0;
}
total = 0;
for (dl = fdl; nlinks > 0; dl = dl->next, nlinks--, thislink++) {
if (!dl) {
dl = bundle->links;
thislink = 0;
}
if (dl->state != DATALINK_OPEN)
continue;
if (dl->physical->out)
/* this link has suffered a short write. Let it continue */
continue;
add = link_QueueLen(&dl->physical->link);
if (add) {
/* this link has got stuff already queued. Let it continue */
total += add;
continue;
}
if (!mp_QueueLen(mp)) {
int mrutoosmall;
/*
* If there's only a single open link in our bundle and we haven't got
* MP level link compression, queue outbound traffic directly via that
* link's protocol stack rather than using the MP link. This results
* in the outbound traffic going out as PROTO_IP or PROTO_IPV6 rather
* than PROTO_MP.
*/
mrutoosmall = 0;
sendasip = nopenlinks < 2;
if (sendasip) {
if (dl->physical->link.lcp.his_mru < mp->peer_mrru) {
/*
* Actually, forget it. This test is done against the MRRU rather
* than the packet size so that we don't end up sending some data
* in MP fragments and some data in PROTO_IP packets. That's just
* too likely to upset some ppp implementations.
*/
mrutoosmall = 1;
sendasip = 0;
}
}
bestlink = sendasip ? &dl->physical->link : &mp->link;
if (!ncp_PushPacket(&bundle->ncp, &mp->out.af, bestlink))
break; /* Nothing else to send */
if (mrutoosmall)
log_Printf(LogDEBUG, "Don't send data as PROTO_IP, MRU < MRRU\n");
else if (sendasip)
log_Printf(LogDEBUG, "Sending data as PROTO_IP, not PROTO_MP\n");
if (sendasip) {
add = link_QueueLen(&dl->physical->link);
if (add) {
/* this link has got stuff already queued. Let it continue */
total += add;
continue;
}
}
}
m = link_Dequeue(&mp->link);
if (m) {
len = m_length(m);
begin = 1;
end = 0;
while (!end) {
if (dl->state == DATALINK_OPEN) {
/* Write at most his_mru bytes to the physical link */
if (len <= dl->physical->link.lcp.his_mru) {
mo = m;
end = 1;
m_settype(mo, MB_MPOUT);
} else {
/* It's > his_mru, chop the packet (`m') into bits */
mo = m_get(dl->physical->link.lcp.his_mru, MB_MPOUT);
len -= mo->m_len;
m = mbuf_Read(m, MBUF_CTOP(mo), mo->m_len);
}
mp_Output(mp, bundle, &dl->physical->link, mo, begin, end);
begin = 0;
}
if (!end) {
nlinks--;
dl = dl->next;
if (!dl) {
dl = bundle->links;
thislink = 0;
} else
thislink++;
}
}
}
}
mp->out.link = thislink; /* Start here next time */
return total;
}
int
mp_SetDatalinkBandwidth(struct cmdargs const *arg)
{
int val;
if (arg->argc != arg->argn+1)
return -1;
val = atoi(arg->argv[arg->argn]);
if (val <= 0) {
log_Printf(LogWARN, "The link bandwidth must be greater than zero\n");
return 1;
}
arg->cx->mp.bandwidth = val;
if (arg->cx->state == DATALINK_OPEN)
bundle_CalculateBandwidth(arg->bundle);
return 0;
}
int
mp_ShowStatus(struct cmdargs const *arg)
{
struct mp *mp = &arg->bundle->ncp.mp;
prompt_Printf(arg->prompt, "Multilink is %sactive\n", mp->active ? "" : "in");
if (mp->active) {
struct mbuf *m, *lm;
int bufs = 0;
lm = NULL;
prompt_Printf(arg->prompt, "Socket: %s\n",
mp->server.socket.sun_path);
for (m = mp->inbufs; m; m = m->m_nextpkt) {
bufs++;
lm = m;
}
prompt_Printf(arg->prompt, "Pending frags: %d", bufs);
if (bufs) {
struct mp_header mh;
unsigned long first, last;
first = mp_ReadHeader(mp, mp->inbufs, &mh) ? mh.seq : 0;
last = mp_ReadHeader(mp, lm, &mh) ? mh.seq : 0;
prompt_Printf(arg->prompt, " (Have %lu - %lu, want %lu, lowest %lu)\n",
first, last, (unsigned long)mp->seq.next_in,
(unsigned long)mp->seq.min_in);
prompt_Printf(arg->prompt, " First has %sbegin bit and "
"%send bit", mh.begin ? "" : "no ", mh.end ? "" : "no ");
}
prompt_Printf(arg->prompt, "\n");
}
prompt_Printf(arg->prompt, "\nMy Side:\n");
if (mp->active) {
prompt_Printf(arg->prompt, " Output SEQ: %u\n", mp->out.seq);
prompt_Printf(arg->prompt, " MRRU: %u\n", mp->local_mrru);
prompt_Printf(arg->prompt, " Short Seq: %s\n",
mp->local_is12bit ? "on" : "off");
}
prompt_Printf(arg->prompt, " Discriminator: %s\n",
mp_Enddisc(mp->cfg.enddisc.class, mp->cfg.enddisc.address,
mp->cfg.enddisc.len));
prompt_Printf(arg->prompt, "\nHis Side:\n");
if (mp->active) {
prompt_Printf(arg->prompt, " Auth Name: %s\n", mp->peer.authname);
prompt_Printf(arg->prompt, " Input SEQ: %u\n", mp->seq.next_in);
prompt_Printf(arg->prompt, " MRRU: %u\n", mp->peer_mrru);
prompt_Printf(arg->prompt, " Short Seq: %s\n",
mp->peer_is12bit ? "on" : "off");
}
prompt_Printf(arg->prompt, " Discriminator: %s\n",
mp_Enddisc(mp->peer.enddisc.class, mp->peer.enddisc.address,
mp->peer.enddisc.len));
prompt_Printf(arg->prompt, "\nDefaults:\n");
prompt_Printf(arg->prompt, " MRRU: ");
if (mp->cfg.mrru)
prompt_Printf(arg->prompt, "%d (multilink enabled)\n", mp->cfg.mrru);
else
prompt_Printf(arg->prompt, "disabled\n");
prompt_Printf(arg->prompt, " Short Seq: %s\n",
command_ShowNegval(mp->cfg.shortseq));
prompt_Printf(arg->prompt, " Discriminator: %s\n",
command_ShowNegval(mp->cfg.negenddisc));
prompt_Printf(arg->prompt, " AutoLoad: min %d%%, max %d%%,"
" period %d secs\n", mp->cfg.autoload.min,
mp->cfg.autoload.max, mp->cfg.autoload.period);
return 0;
}
const char *
mp_Enddisc(u_char c, const char *address, size_t len)
{
static char result[100]; /* Used immediately after it's returned */
unsigned f, header;
switch (c) {
case ENDDISC_NULL:
sprintf(result, "Null Class");
break;
case ENDDISC_LOCAL:
snprintf(result, sizeof result, "Local Addr: %.*s", (int)len,
address);
break;
case ENDDISC_IP:
if (len == 4)
snprintf(result, sizeof result, "IP %s",
inet_ntoa(*(const struct in_addr *)address));
else
sprintf(result, "IP[%zd] ???", len);
break;
case ENDDISC_MAC:
if (len == 6) {
const u_char *m = (const u_char *)address;
snprintf(result, sizeof result, "MAC %02x:%02x:%02x:%02x:%02x:%02x",
m[0], m[1], m[2], m[3], m[4], m[5]);
} else
sprintf(result, "MAC[%zd] ???", len);
break;
case ENDDISC_MAGIC:
sprintf(result, "Magic: 0x");
header = strlen(result);
if (len + header + 1 > sizeof result)
len = sizeof result - header - 1;
for (f = 0; f < len; f++)
sprintf(result + header + 2 * f, "%02x", address[f]);
break;
case ENDDISC_PSN:
snprintf(result, sizeof result, "PSN: %.*s", (int)len, address);
break;
default:
sprintf(result, "%d: ", (int)c);
header = strlen(result);
if (len + header + 1 > sizeof result)
len = sizeof result - header - 1;
for (f = 0; f < len; f++)
sprintf(result + header + 2 * f, "%02x", address[f]);
break;
}
return result;
}
int
mp_SetEnddisc(struct cmdargs const *arg)
{
struct mp *mp = &arg->bundle->ncp.mp;
struct in_addr addr;
switch (bundle_Phase(arg->bundle)) {
case PHASE_DEAD:
break;
case PHASE_ESTABLISH:
/* Make sure none of our links are DATALINK_LCP or greater */
if (bundle_HighestState(arg->bundle) >= DATALINK_LCP) {
log_Printf(LogWARN, "enddisc: Only changeable before"
" LCP negotiations\n");
return 1;
}
break;
default:
log_Printf(LogWARN, "enddisc: Only changeable at phase DEAD/ESTABLISH\n");
return 1;
}
if (arg->argc == arg->argn) {
mp->cfg.enddisc.class = 0;
*mp->cfg.enddisc.address = '\0';
mp->cfg.enddisc.len = 0;
} else if (arg->argc > arg->argn) {
if (!strcasecmp(arg->argv[arg->argn], "label")) {
mp->cfg.enddisc.class = ENDDISC_LOCAL;
strcpy(mp->cfg.enddisc.address, arg->bundle->cfg.label);
mp->cfg.enddisc.len = strlen(mp->cfg.enddisc.address);
} else if (!strcasecmp(arg->argv[arg->argn], "ip")) {
if (arg->bundle->ncp.ipcp.my_ip.s_addr == INADDR_ANY)
ncprange_getip4addr(&arg->bundle->ncp.ipcp.cfg.my_range, &addr);
else
addr = arg->bundle->ncp.ipcp.my_ip;
memcpy(mp->cfg.enddisc.address, &addr.s_addr, sizeof addr.s_addr);
mp->cfg.enddisc.class = ENDDISC_IP;
mp->cfg.enddisc.len = sizeof arg->bundle->ncp.ipcp.my_ip.s_addr;
} else if (!strcasecmp(arg->argv[arg->argn], "mac")) {
struct sockaddr_dl hwaddr;
if (arg->bundle->ncp.ipcp.my_ip.s_addr == INADDR_ANY)
ncprange_getip4addr(&arg->bundle->ncp.ipcp.cfg.my_range, &addr);
else
addr = arg->bundle->ncp.ipcp.my_ip;
if (arp_EtherAddr(addr, &hwaddr, 1)) {
mp->cfg.enddisc.class = ENDDISC_MAC;
memcpy(mp->cfg.enddisc.address, hwaddr.sdl_data + hwaddr.sdl_nlen,
hwaddr.sdl_alen);
mp->cfg.enddisc.len = hwaddr.sdl_alen;
} else {
log_Printf(LogWARN, "set enddisc: Can't locate MAC address for %s\n",
inet_ntoa(addr));
return 4;
}
} else if (!strcasecmp(arg->argv[arg->argn], "magic")) {
int f;
randinit();
for (f = 0; f < 20; f += sizeof(long))
*(long *)(mp->cfg.enddisc.address + f) = random();
mp->cfg.enddisc.class = ENDDISC_MAGIC;
mp->cfg.enddisc.len = 20;
} else if (!strcasecmp(arg->argv[arg->argn], "psn")) {
if (arg->argc > arg->argn+1) {
mp->cfg.enddisc.class = ENDDISC_PSN;
strcpy(mp->cfg.enddisc.address, arg->argv[arg->argn+1]);
mp->cfg.enddisc.len = strlen(mp->cfg.enddisc.address);
} else {
log_Printf(LogWARN, "PSN endpoint requires additional data\n");
return 5;
}
} else {
log_Printf(LogWARN, "%s: Unrecognised endpoint type\n",
arg->argv[arg->argn]);
return 6;
}
}
return 0;
}
static int
mpserver_UpdateSet(struct fdescriptor *d, fd_set *r, fd_set *w, fd_set *e,
int *n)
{
struct mpserver *s = descriptor2mpserver(d);
int result;
result = 0;
if (s->send.dl != NULL) {
/* We've connect()ed */
if (!link_QueueLen(&s->send.dl->physical->link) &&
!s->send.dl->physical->out) {
/* Only send if we've transmitted all our data (i.e. the ConfigAck) */
result -= datalink_RemoveFromSet(s->send.dl, r, w, e);
bundle_SendDatalink(s->send.dl, s->fd, &s->socket);
s->send.dl = NULL;
s->fd = -1;
} else
/* Never read from a datalink that's on death row ! */
result -= datalink_RemoveFromSet(s->send.dl, r, NULL, NULL);
} else if (r && s->fd >= 0) {
if (*n < s->fd + 1)
*n = s->fd + 1;
FD_SET(s->fd, r);
log_Printf(LogTIMER, "mp: fdset(r) %d\n", s->fd);
result++;
}
return result;
}
static int
mpserver_IsSet(struct fdescriptor *d, const fd_set *fdset)
{
struct mpserver *s = descriptor2mpserver(d);
return s->fd >= 0 && FD_ISSET(s->fd, fdset);
}
static void
mpserver_Read(struct fdescriptor *d, struct bundle *bundle,
const fd_set *fdset __unused)
{
struct mpserver *s = descriptor2mpserver(d);
bundle_ReceiveDatalink(bundle, s->fd);
}
static int
mpserver_Write(struct fdescriptor *d __unused, struct bundle *bundle __unused,
const fd_set *fdset __unused)
{
/* We never want to write here ! */
log_Printf(LogALERT, "mpserver_Write: Internal error: Bad call !\n");
return 0;
}
void
mpserver_Init(struct mpserver *s)
{
s->desc.type = MPSERVER_DESCRIPTOR;
s->desc.UpdateSet = mpserver_UpdateSet;
s->desc.IsSet = mpserver_IsSet;
s->desc.Read = mpserver_Read;
s->desc.Write = mpserver_Write;
s->send.dl = NULL;
s->fd = -1;
memset(&s->socket, '\0', sizeof s->socket);
}
int
mpserver_Open(struct mpserver *s, struct peerid *peer)
{
int f, l;
mode_t mask;
if (s->fd != -1) {
log_Printf(LogALERT, "Internal error ! mpserver already open\n");
mpserver_Close(s);
}
l = snprintf(s->socket.sun_path, sizeof s->socket.sun_path, "%sppp-%s-%02x-",
_PATH_VARRUN, peer->authname, peer->enddisc.class);
if (l < 0) {
log_Printf(LogERROR, "mpserver: snprintf(): %s\n", strerror(errno));
return MPSERVER_FAILED;
}
for (f = 0;
f < peer->enddisc.len && (size_t)l < sizeof s->socket.sun_path - 2;
f++) {
snprintf(s->socket.sun_path + l, sizeof s->socket.sun_path - l,
"%02x", *(u_char *)(peer->enddisc.address+f));
l += 2;
}
s->socket.sun_family = AF_LOCAL;
s->socket.sun_len = sizeof s->socket;
s->fd = ID0socket(PF_LOCAL, SOCK_DGRAM, 0);
if (s->fd < 0) {
log_Printf(LogERROR, "mpserver: socket(): %s\n", strerror(errno));
return MPSERVER_FAILED;
}
setsockopt(s->fd, SOL_SOCKET, SO_REUSEADDR, (struct sockaddr *)&s->socket,
sizeof s->socket);
mask = umask(0177);
/*
* Try to bind the socket. If we succeed we play server, if we fail
* we connect() and hand the link off.
*/
if (ID0bind_un(s->fd, &s->socket) < 0) {
if (errno != EADDRINUSE) {
log_Printf(LogPHASE, "mpserver: can't create bundle socket %s (%s)\n",
s->socket.sun_path, strerror(errno));
umask(mask);
close(s->fd);
s->fd = -1;
return MPSERVER_FAILED;
}
/* So we're the sender */
umask(mask);
if (ID0connect_un(s->fd, &s->socket) < 0) {
log_Printf(LogPHASE, "mpserver: can't connect to bundle socket %s (%s)\n",
s->socket.sun_path, strerror(errno));
if (errno == ECONNREFUSED)
log_Printf(LogPHASE, " The previous server died badly !\n");
close(s->fd);
s->fd = -1;
return MPSERVER_FAILED;
}
/* Donate our link to the other guy */
return MPSERVER_CONNECTED;
}
return MPSERVER_LISTENING;
}
void
mpserver_Close(struct mpserver *s)
{
if (s->send.dl != NULL) {
bundle_SendDatalink(s->send.dl, s->fd, &s->socket);
s->send.dl = NULL;
s->fd = -1;
} else if (s->fd >= 0) {
close(s->fd);
if (ID0unlink(s->socket.sun_path) == -1)
log_Printf(LogERROR, "%s: Failed to remove: %s\n", s->socket.sun_path,
strerror(errno));
memset(&s->socket, '\0', sizeof s->socket);
s->fd = -1;
}
}
void
mp_LinkLost(struct mp *mp, struct datalink *dl)
{
if (mp->seq.min_in == dl->mp.seq)
/* We've lost the link that's holding everything up ! */
mp_Assemble(mp, NULL, NULL);
}
size_t
mp_QueueLen(struct mp *mp)
{
return link_QueueLen(&mp->link);
}
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