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+/*-
+ * 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.
+ *
+ * $FreeBSD: src/usr.sbin/ppp/mp.c,v 1.55.26.1 2010/12/21 17:10:29 kensmith Exp $
+ */
+
+#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 changable before"
+ " LCP negotiations\n");
+ return 1;
+ }
+ break;
+ default:
+ log_Printf(LogWARN, "enddisc: Only changable 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);
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-03 02:04:53 +0000