diff options
Diffstat (limited to 'usr.sbin/ppp/mp.c')
-rw-r--r-- | usr.sbin/ppp/mp.c | 1209 |
1 files changed, 1209 insertions, 0 deletions
diff --git a/usr.sbin/ppp/mp.c b/usr.sbin/ppp/mp.c new file mode 100644 index 0000000..b2cb46c --- /dev/null +++ b/usr.sbin/ppp/mp.c @@ -0,0 +1,1209 @@ +/*- + * 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. + * + * $FreeBSD$ + */ + +#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); +} |