2 * if_ppp.c - Point-to-Point Protocol (PPP) Asynchronous driver.
4 * Copyright (c) 1989 Carnegie Mellon University.
7 * Redistribution and use in source and binary forms are permitted
8 * provided that the above copyright notice and this paragraph are
9 * duplicated in all such forms and that any documentation,
10 * advertising materials, and other materials related to such
11 * distribution and use acknowledge that the software was developed
12 * by Carnegie Mellon University. The name of the
13 * University may not be used to endorse or promote products derived
14 * from this software without specific prior written permission.
15 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
17 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
20 * Carnegie Mellon University
22 * Pittsburgh, PA 15213
27 * @(#)if_sl.c 7.6.1.2 (Berkeley) 2/15/89
29 * Copyright (c) 1987 Regents of the University of California.
30 * All rights reserved.
32 * Redistribution and use in source and binary forms are permitted
33 * provided that the above copyright notice and this paragraph are
34 * duplicated in all such forms and that any documentation,
35 * advertising materials, and other materials related to such
36 * distribution and use acknowledge that the software was developed
37 * by the University of California, Berkeley. The name of the
38 * University may not be used to endorse or promote products derived
39 * from this software without specific prior written permission.
40 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
41 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
42 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
44 * Serial Line interface
47 * Center for Seismic Studies
48 * 1300 N 17th Street, Suite 1450
49 * Arlington, Virginia 22209
54 * Pounded on heavily by Chris Torek (chris@mimsy.umd.edu, umcp-cs!chris).
55 * Converted to 4.3BSD Beta by Chris Torek.
56 * Other changes made at Berkeley, based in part on code by Kirk Smith.
58 * Converted to 4.3BSD+ 386BSD by Brad Parker (brad@cayman.com)
59 * Added VJ tcp header compression; more unified ioctls
61 * Extensively modified by Paul Mackerras (paulus@cs.anu.edu.au).
62 * Cleaned up a lot of the mbuf-related code to fix bugs that
63 * caused system crashes and packet corruption. Changed pppstart
64 * so that it doesn't just give up with a collision if the whole
65 * packet doesn't fit in the output ring buffer.
67 * Added priority queueing for interactive IP packets, following
68 * the model of if_sl.c, plus hooks for bpf.
69 * Paul Mackerras (paulus@cs.anu.edu.au).
71 * Ultrix port by Per Sundstrom <sundstrom@stkhlm.enet.dec.com>,
72 * Robert Olsson <robert@robur.slu.se> and Paul Mackerras.
75 /* $Id: if_ppp.c,v 1.12 1996/09/26 06:18:37 paulus Exp $ */
76 /* from if_sl.c,v 1.11 84/10/04 12:54:47 rick Exp */
77 /* from NetBSD: if_ppp.c,v 1.15.2.2 1994/07/28 05:17:58 cgd Exp */
85 #include "../h/param.h"
86 #include "../h/user.h"
87 #include "../h/proc.h"
88 #include "../h/mbuf.h"
90 #include "../h/socket.h"
91 #include "../h/ioctl.h"
92 #include "../h/systm.h"
93 #include "../h/time.h"
95 #include "../net/net/if.h"
96 #include "../net/net/netisr.h"
97 #include "../net/net/route.h"
100 #include "../net/netinet/in.h"
101 #include "../net/netinet/in_systm.h"
102 #include "../net/netinet/in_var.h"
103 #include "../net/netinet/ip.h"
107 #include "../machine/mtpr.h"
111 #include "slcompress.h"
114 #include "ppp_defs.h"
116 #include "if_pppvar.h"
119 #define PACKETPTR struct mbuf *
120 #include "ppp-comp.h"
123 static void ppp_requeue __P((struct ppp_softc *));
124 static void ppp_outpkt __P((struct ppp_softc *));
125 static void ppp_ccp __P((struct ppp_softc *, struct mbuf *m, int rcvd));
126 static void ppp_ccp_closed __P((struct ppp_softc *));
127 static void ppp_inproc __P((struct ppp_softc *, struct mbuf *));
128 static void pppdumpm __P((struct mbuf *m0));
131 * Some useful mbuf macros not in mbuf.h.
133 #define M_IS_CLUSTER(m) ((m)->m_off > MMAXOFF)
135 #define M_TRAILINGSPACE(m) \
136 ((M_IS_CLUSTER(m) ? (u_int)(m)->m_clptr + M_CLUSTERSZ : MSIZE) \
137 - ((m)->m_off + (m)->m_len))
139 #define M_OFFSTART(m) \
140 (M_IS_CLUSTER(m) ? (u_int)(m)->m_clptr : MMINOFF)
142 #define M_DATASIZE(m) \
143 (M_IS_CLUSTER(m) ? M_CLUSTERSZ : MLEN)
146 * The following disgusting hack gets around the problem that IP TOS
147 * can't be set yet. We want to put "interactive" traffic on a high
148 * priority queue. To decide if traffic is interactive, we check that
149 * a) it is TCP and b) one of its ports is telnet, rlogin or ftp control.
151 static u_short interactive_ports[8] = {
155 #define INTERACTIVE(p) (interactive_ports[(p) & 7] == (p))
159 * List of compressors we know about.
162 extern struct compressor ppp_bsd_compress;
163 extern struct compressor ppp_deflate;
165 struct compressor *ppp_compressors[] = {
174 #endif /* PPP_COMPRESS */
178 * Called from boot code to establish ppp interfaces.
183 register struct ppp_softc *sc;
186 for (sc = ppp_softc; i < NPPP; sc++) {
187 sc->sc_if.if_name = "ppp";
188 sc->sc_if.if_unit = i++;
189 sc->sc_if.if_mtu = PPP_MTU;
190 sc->sc_if.if_flags = IFF_POINTOPOINT;
191 sc->sc_if.if_type = IFT_PPP;
192 sc->sc_if.if_ioctl = pppsioctl;
193 sc->sc_if.if_output = pppoutput;
194 sc->sc_if.if_snd.ifq_maxlen = IFQ_MAXLEN;
195 sc->sc_inq.ifq_maxlen = IFQ_MAXLEN;
196 sc->sc_fastq.ifq_maxlen = IFQ_MAXLEN;
197 sc->sc_rawq.ifq_maxlen = IFQ_MAXLEN;
198 if_attach(&sc->sc_if);
200 bpfattach(&sc->sc_bpf, &sc->sc_if, DLT_PPP, PPP_HDRLEN);
206 * Allocate a ppp interface unit and initialize it.
213 struct ppp_softc *sc;
215 for (nppp = 0, sc = ppp_softc; nppp < NPPP; nppp++, sc++)
216 if (sc->sc_xfer == pid) {
220 for (nppp = 0, sc = ppp_softc; nppp < NPPP; nppp++, sc++)
221 if (sc->sc_devp == NULL)
227 sc->sc_mru = PPP_MRU;
228 sc->sc_relinq = NULL;
229 bzero((char *)&sc->sc_stats, sizeof(sc->sc_stats));
231 KM_ALLOC(sc->sc_comp, struct slcompress *, sizeof(struct slcompress),
232 KM_DEVBUF, KM_NOARG);
234 sl_compress_init(sc->sc_comp);
237 sc->sc_xc_state = NULL;
238 sc->sc_rc_state = NULL;
239 #endif /* PPP_COMPRESS */
240 for (i = 0; i < NUM_NP; ++i)
241 sc->sc_npmode[i] = NPMODE_ERROR;
242 sc->sc_npqueue = NULL;
243 sc->sc_npqtail = &sc->sc_npqueue;
244 sc->sc_last_sent = sc->sc_last_recv = time.tv_sec;
250 * Deallocate a ppp unit. Must be called at splnet or higher.
254 struct ppp_softc *sc;
259 sc->sc_if.if_flags &= ~(IFF_UP|IFF_RUNNING);
263 IF_DEQUEUE(&sc->sc_rawq, m);
269 IF_DEQUEUE(&sc->sc_inq, m);
275 IF_DEQUEUE(&sc->sc_fastq, m);
280 while ((m = sc->sc_npqueue) != NULL) {
281 sc->sc_npqueue = m->m_act;
284 if (sc->sc_togo != NULL) {
285 m_freem(sc->sc_togo);
290 sc->sc_xc_state = NULL;
291 sc->sc_rc_state = NULL;
292 #endif /* PPP_COMPRESS */
294 if (sc->sc_comp != 0) {
295 KM_FREE(sc->sc_comp, KM_DEVBUF);
302 * Ioctl routine for generic ppp devices.
305 pppioctl(sc, cmd, data, flag)
306 struct ppp_softc *sc;
310 struct proc *p = u.u_procp;
311 int s, error, flags, mru, mtu, nb, npx;
312 struct ppp_option_data *odp;
313 struct compressor **cp;
317 u_char ccp_option[CCP_MAX_OPTION_LENGTH];
322 *(int *)data = sc->sc_inq.ifq_len;
326 *(int *)data = sc->sc_if.if_unit;
330 *(u_int *)data = sc->sc_flags;
336 flags = *(int *)data & SC_MASK;
339 if (sc->sc_flags & SC_CCP_OPEN && !(flags & SC_CCP_OPEN))
343 sc->sc_flags = (sc->sc_flags & ~SC_MASK) | flags;
351 if (mru >= PPP_MRU && mru <= PPP_MAXMRU)
356 *(int *)data = sc->sc_mru;
360 * PPPIOC[GS]MTU are implemented here, instead of supporting
361 * SIOC[GS]IFMTU in pppsioctl, because under Ultrix, we can't get an
362 * interface ioctl through to the interface until it has an IP
369 if (mtu <= 0 || mtu > PPP_MAXMRU)
372 sc->sc_if.if_mtu = mtu;
377 *(int *) data = sc->sc_if.if_mtu;
386 sl_compress_setup(sc->sc_comp, *(int *)data);
395 sc->sc_xfer = p->p_pid;
399 case PPPIOCSCOMPRESS:
402 odp = (struct ppp_option_data *) data;
404 if (nb > sizeof(ccp_option))
405 nb = sizeof(ccp_option);
406 if ((error = copyin(odp->ptr, ccp_option, nb)) != 0)
408 if (ccp_option[1] < 2) /* preliminary check on the length byte */
410 for (cp = ppp_compressors; *cp != NULL; ++cp)
411 if ((*cp)->compress_proto == ccp_option[0]) {
413 * Found a handler for the protocol - try to allocate
414 * a compressor or decompressor.
419 if (sc->sc_xc_state != NULL)
420 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state);
422 sc->sc_xc_state = (*cp)->comp_alloc(ccp_option, nb);
423 if (sc->sc_xc_state == NULL) {
424 if (sc->sc_flags & SC_DEBUG)
425 printf("ppp%d: comp_alloc failed\n",
430 sc->sc_flags &= ~SC_COMP_RUN;
434 if (sc->sc_rc_state != NULL)
435 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state);
437 sc->sc_rc_state = (*cp)->decomp_alloc(ccp_option, nb);
438 if (sc->sc_rc_state == NULL) {
439 if (sc->sc_flags & SC_DEBUG)
440 printf("ppp%d: decomp_alloc failed\n",
445 sc->sc_flags &= ~SC_DECOMP_RUN;
450 if (sc->sc_flags & SC_DEBUG)
451 printf("ppp%d: no compressor for [%x %x %x], %x\n",
452 sc->sc_if.if_unit, ccp_option[0], ccp_option[1],
454 return (EINVAL); /* no handler found */
455 #endif /* PPP_COMPRESS */
459 npi = (struct npioctl *) data;
460 switch (npi->protocol) {
467 if (cmd == PPPIOCGNPMODE) {
468 npi->mode = sc->sc_npmode[npx];
472 if (npi->mode != sc->sc_npmode[npx]) {
474 sc->sc_npmode[npx] = npi->mode;
475 if (npi->mode != NPMODE_QUEUE) {
487 ((struct ppp_idle *)data)->xmit_idle = t - sc->sc_last_sent;
488 ((struct ppp_idle *)data)->recv_idle = t - sc->sc_last_recv;
499 * Process an ioctl request to the ppp network interface.
502 pppsioctl(ifp, cmd, data)
503 register struct ifnet *ifp;
507 struct proc *p = u.u_procp;
508 register struct ppp_softc *sc = &ppp_softc[ifp->if_unit];
509 register struct ifaddr *ifa = (struct ifaddr *)data;
510 register struct ifreq *ifr = (struct ifreq *)data;
511 struct ppp_stats *psp;
513 struct ppp_comp_stats *pcp;
515 int s = splimp(), error = 0;
519 if ((ifp->if_flags & IFF_RUNNING) == 0)
520 ifp->if_flags &= ~IFF_UP;
524 if (ifa->ifa_addr.sa_family != AF_INET)
525 error = EAFNOSUPPORT;
529 if (ifa->ifa_addr.sa_family != AF_INET)
530 error = EAFNOSUPPORT;
534 * Ioctls other than the above don't get through until the
535 * interface has its IP addresses set :-(
542 sc->sc_if.if_mtu = ifr->ifr_mtu;
546 ifr->ifr_mtu = sc->sc_if.if_mtu;
551 psp = &((struct ifpppstatsreq *) data)->stats;
552 bzero(psp, sizeof(*psp));
553 psp->p = sc->sc_stats;
554 #if defined(VJC) && !defined(SL_NO_STATS)
556 psp->vj.vjs_packets = sc->sc_comp->sls_packets;
557 psp->vj.vjs_compressed = sc->sc_comp->sls_compressed;
558 psp->vj.vjs_searches = sc->sc_comp->sls_searches;
559 psp->vj.vjs_misses = sc->sc_comp->sls_misses;
560 psp->vj.vjs_uncompressedin = sc->sc_comp->sls_uncompressedin;
561 psp->vj.vjs_compressedin = sc->sc_comp->sls_compressedin;
562 psp->vj.vjs_errorin = sc->sc_comp->sls_errorin;
563 psp->vj.vjs_tossed = sc->sc_comp->sls_tossed;
570 pcp = &((struct ifpppcstatsreq *) data)->stats;
571 bzero(pcp, sizeof(*pcp));
572 if (sc->sc_xc_state != NULL)
573 (*sc->sc_xcomp->comp_stat)(sc->sc_xc_state, &pcp->c);
574 if (sc->sc_rc_state != NULL)
575 (*sc->sc_rcomp->decomp_stat)(sc->sc_rc_state, &pcp->d);
577 #endif /* PPP_COMPRESS */
587 * Queue a packet. Start transmission if not active.
588 * Packet is placed in Information field of PPP frame.
591 pppoutput(ifp, m0, dst)
594 struct sockaddr *dst;
596 register struct ppp_softc *sc = &ppp_softc[ifp->if_unit];
597 int protocol, address, control;
606 if (sc->sc_devp == NULL || (ifp->if_flags & IFF_RUNNING) == 0
607 || ((ifp->if_flags & IFF_UP) == 0 && dst->sa_family != AF_UNSPEC)) {
608 error = ENETDOWN; /* sort of */
613 * Compute PPP header.
614 * We use the m_context field of the mbuf to indicate whether
615 * the packet should go on the fast queue.
618 switch (dst->sa_family) {
621 address = PPP_ALLSTATIONS;
624 mode = sc->sc_npmode[NP_IP];
627 * If this is a TCP packet to or from an "interactive" port,
628 * put the packet on the fastq instead.
630 if ((ip = mtod(m0, struct ip *))->ip_p == IPPROTO_TCP) {
631 register int p = ntohl(((int *)ip)[ip->ip_hl]);
632 if (INTERACTIVE(p & 0xffff) || INTERACTIVE(p >> 16))
638 address = PPP_ADDRESS(dst->sa_data);
639 control = PPP_CONTROL(dst->sa_data);
640 protocol = PPP_PROTOCOL(dst->sa_data);
644 printf("ppp%d: af%d not supported\n", ifp->if_unit, dst->sa_family);
645 error = EAFNOSUPPORT;
650 * Drop this packet, or return an error, if necessary.
652 if (mode == NPMODE_ERROR) {
656 if (mode == NPMODE_DROP) {
662 * Add PPP header. If no space in first mbuf, allocate another.
664 if (M_IS_CLUSTER(m0) || m0->m_off < MMINOFF + PPP_HDRLEN) {
667 MGET(m, M_DONTWAIT, MT_DATA);
676 m0->m_off -= PPP_HDRLEN;
678 cp = mtod(m0, u_char *);
681 *cp++ = protocol >> 8;
682 *cp++ = protocol & 0xff;
683 m0->m_len += PPP_HDRLEN;
686 for (m = m0; m != 0; m = m->m_next)
689 if (sc->sc_flags & SC_LOG_OUTPKT) {
690 printf("ppp%d output: ", ifp->if_unit);
694 if ((protocol & 0x8000) == 0) {
696 * Update the time we sent the most recent data packet.
698 sc->sc_last_sent = time.tv_sec;
703 * See if bpf wants to look at the packet.
706 bpf_mtap(sc->sc_bpf, m0);
710 * Put the packet on the appropriate queue.
713 if (mode == NPMODE_QUEUE) {
714 /* XXX we should limit the number of packets on this queue */
715 *sc->sc_npqtail = m0;
717 sc->sc_npqtail = &m0->m_act;
719 ifq = m0->m_context? &sc->sc_fastq: &ifp->if_snd;
720 if (IF_QFULL(ifq) && dst->sa_family != AF_UNSPEC) {
723 sc->sc_if.if_oerrors++;
724 sc->sc_stats.ppp_oerrors++;
742 * After a change in the NPmode for some NP, move packets from the
743 * npqueue to the send queue or the fast queue as appropriate.
744 * Should be called at splnet.
748 struct ppp_softc *sc;
750 struct mbuf *m, **mpp;
754 for (mpp = &sc->sc_npqueue; (m = *mpp) != NULL; ) {
755 switch (PPP_PROTOCOL(mtod(m, u_char *))) {
757 mode = sc->sc_npmode[NP_IP];
766 * This packet can now go on one of the queues to be sent.
770 ifq = m->m_context? &sc->sc_fastq: &sc->sc_if.if_snd;
773 sc->sc_if.if_oerrors++;
774 sc->sc_stats.ppp_oerrors++;
790 sc->sc_npqtail = mpp;
794 * Transmitter has finished outputting some stuff;
795 * remember to call sc->sc_start later at splnet.
799 struct ppp_softc *sc;
803 sc->sc_flags &= ~SC_TBUSY;
804 schednetisr(NETISR_PPP);
809 * Get a packet to send. This procedure is intended to be called at
810 * splnet, since it may involve time-consuming operations such as
811 * applying VJ compression, packet compression, address/control and/or
812 * protocol field compression to the packet.
816 struct ppp_softc *sc;
820 int address, control, protocol;
824 * Grab a packet to send: first try the fast queue, then the
827 IF_DEQUEUE(&sc->sc_fastq, m);
829 IF_DEQUEUE(&sc->sc_if.if_snd, m);
833 ++sc->sc_stats.ppp_opackets;
836 * Extract the ppp header of the new packet.
837 * The ppp header will be in one mbuf.
839 cp = mtod(m, u_char *);
840 address = PPP_ADDRESS(cp);
841 control = PPP_CONTROL(cp);
842 protocol = PPP_PROTOCOL(cp);
848 * If the packet is a TCP/IP packet, see if we can compress it.
850 if ((sc->sc_flags & SC_COMP_TCP) && sc->sc_comp != NULL) {
855 ip = (struct ip *) (cp + PPP_HDRLEN);
856 if (mp->m_len <= PPP_HDRLEN) {
860 ip = mtod(mp, struct ip *);
862 /* this code assumes the IP/TCP header is in one non-shared mbuf */
863 if (ip->ip_p == IPPROTO_TCP) {
864 type = sl_compress_tcp(mp, ip, sc->sc_comp,
865 !(sc->sc_flags & SC_NO_TCP_CCID));
867 case TYPE_UNCOMPRESSED_TCP:
868 protocol = PPP_VJC_UNCOMP;
870 case TYPE_COMPRESSED_TCP:
871 protocol = PPP_VJC_COMP;
872 cp = mtod(m, u_char *);
873 cp[0] = address; /* header has moved */
878 cp[3] = protocol; /* update protocol in PPP header */
888 #endif /* PPP_COMPRESS */
892 if (protocol != PPP_LCP && protocol != PPP_CCP
893 && sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) {
894 struct mbuf *mcomp = NULL;
898 for (mp = m; mp != NULL; mp = mp->m_next)
900 clen = (*sc->sc_xcomp->compress)
901 (sc->sc_xc_state, &mcomp, m, slen, sc->sc_if.if_mtu + PPP_HDRLEN);
903 if (sc->sc_flags & SC_CCP_UP) {
904 /* Send the compressed packet instead of the original. */
907 cp = mtod(m, u_char *);
910 /* Can't transmit compressed packets until CCP is up. */
915 #endif /* PPP_COMPRESS */
918 * Compress the address/control and protocol, if possible.
920 if (sc->sc_flags & SC_COMP_AC && address == PPP_ALLSTATIONS &&
921 control == PPP_UI && protocol != PPP_ALLSTATIONS &&
922 protocol != PPP_LCP) {
923 /* can compress address/control */
927 if (sc->sc_flags & SC_COMP_PROT && protocol < 0xFF) {
928 /* can compress protocol */
929 if (mtod(m, u_char *) == cp) {
930 cp[2] = cp[1]; /* move address/control up */
941 * Software interrupt routine, called at splnet.
946 struct ppp_softc *sc;
952 for (i = 0; i < NPPP; ++i, ++sc) {
953 if (!(sc->sc_flags & SC_TBUSY)
954 && (sc->sc_if.if_snd.ifq_head || sc->sc_fastq.ifq_head)) {
956 sc->sc_flags |= SC_TBUSY;
962 IF_DEQUEUE(&sc->sc_rawq, m);
974 * Handle a CCP packet. `rcvd' is 1 if the packet was received,
975 * 0 if it is about to be transmitted.
979 struct ppp_softc *sc;
988 * Get a pointer to the data after the PPP header.
990 if (m->m_len <= PPP_HDRLEN) {
994 dp = (mp != NULL)? mtod(mp, u_char *): NULL;
997 dp = mtod(mp, u_char *) + PPP_HDRLEN;
1000 ep = mtod(mp, u_char *) + mp->m_len;
1001 if (dp + CCP_HDRLEN > ep)
1003 slen = CCP_LENGTH(dp);
1004 if (dp + slen > ep) {
1005 if (sc->sc_flags & SC_DEBUG)
1006 printf("if_ppp/ccp: not enough data in mbuf (%x+%x > %x+%x)\n",
1007 dp, slen, mtod(mp, u_char *), mp->m_len);
1011 switch (CCP_CODE(dp)) {
1015 /* CCP must be going down - disable compression */
1016 if (sc->sc_flags & SC_CCP_UP) {
1018 sc->sc_flags &= ~(SC_CCP_UP | SC_COMP_RUN | SC_DECOMP_RUN);
1024 if (sc->sc_flags & SC_CCP_OPEN && !(sc->sc_flags & SC_CCP_UP)
1025 && slen >= CCP_HDRLEN + CCP_OPT_MINLEN
1026 && slen >= CCP_OPT_LENGTH(dp + CCP_HDRLEN) + CCP_HDRLEN) {
1028 /* we're agreeing to send compressed packets. */
1029 if (sc->sc_xc_state != NULL
1030 && (*sc->sc_xcomp->comp_init)
1031 (sc->sc_xc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN,
1032 sc->sc_if.if_unit, 0, sc->sc_flags & SC_DEBUG)) {
1034 sc->sc_flags |= SC_COMP_RUN;
1038 /* peer is agreeing to send compressed packets. */
1039 if (sc->sc_rc_state != NULL
1040 && (*sc->sc_rcomp->decomp_init)
1041 (sc->sc_rc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN,
1042 sc->sc_if.if_unit, 0, sc->sc_mru,
1043 sc->sc_flags & SC_DEBUG)) {
1045 sc->sc_flags |= SC_DECOMP_RUN;
1046 sc->sc_flags &= ~(SC_DC_ERROR | SC_DC_FERROR);
1054 if (sc->sc_flags & SC_CCP_UP) {
1056 if (sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN))
1057 (*sc->sc_xcomp->comp_reset)(sc->sc_xc_state);
1059 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) {
1060 (*sc->sc_rcomp->decomp_reset)(sc->sc_rc_state);
1062 sc->sc_flags &= ~SC_DC_ERROR;
1072 * CCP is down; free (de)compressor state if necessary.
1076 struct ppp_softc *sc;
1078 if (sc->sc_xc_state) {
1079 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state);
1080 sc->sc_xc_state = NULL;
1082 if (sc->sc_rc_state) {
1083 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state);
1084 sc->sc_rc_state = NULL;
1087 #endif /* PPP_COMPRESS */
1090 * PPP packet input routine.
1091 * The caller has checked and removed the FCS and has inserted
1092 * the address/control bytes and the protocol high byte if they
1096 ppppktin(sc, m, lost)
1097 struct ppp_softc *sc;
1103 m->m_context = lost;
1104 IF_ENQUEUE(&sc->sc_rawq, m);
1105 schednetisr(NETISR_PPP);
1110 * Process a received PPP packet, doing decompression as necessary.
1111 * Should be called at splnet.
1113 #define COMPTYPE(proto) ((proto) == PPP_VJC_COMP? TYPE_COMPRESSED_TCP: \
1114 TYPE_UNCOMPRESSED_TCP)
1118 struct ppp_softc *sc;
1121 struct ifnet *ifp = &sc->sc_if;
1122 struct ifqueue *inq, *lock;
1123 int s, ilen, xlen, proto, rv;
1124 u_char *cp, adrs, ctrl;
1125 struct mbuf *mp, *dmp = NULL, *pc;
1129 sc->sc_stats.ppp_ipackets++;
1131 if (sc->sc_flags & SC_LOG_INPKT) {
1133 for (mp = m; mp != NULL; mp = mp->m_next)
1135 printf("ppp%d: got %d bytes\n", ifp->if_unit, ilen);
1139 cp = mtod(m, u_char *);
1140 adrs = PPP_ADDRESS(cp);
1141 ctrl = PPP_CONTROL(cp);
1142 proto = PPP_PROTOCOL(cp);
1146 sc->sc_flags |= SC_VJ_RESET;
1152 * Decompress this packet if necessary, update the receiver's
1153 * dictionary, or take appropriate action on a CCP packet.
1155 if (proto == PPP_COMP && sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)
1156 && !(sc->sc_flags & SC_DC_ERROR) && !(sc->sc_flags & SC_DC_FERROR)) {
1157 /* decompress this packet */
1158 rv = (*sc->sc_rcomp->decompress)(sc->sc_rc_state, m, &dmp);
1159 if (rv == DECOMP_OK) {
1162 /* no error, but no decompressed packet produced */
1166 cp = mtod(m, u_char *);
1167 proto = PPP_PROTOCOL(cp);
1171 * An error has occurred in decompression.
1172 * Pass the compressed packet up to pppd, which may take
1173 * CCP down or issue a Reset-Req.
1175 if (sc->sc_flags & SC_DEBUG)
1176 printf("ppp%d: decompress failed %d\n", ifp->if_unit, rv);
1178 sc->sc_flags |= SC_VJ_RESET;
1179 if (rv == DECOMP_ERROR)
1180 sc->sc_flags |= SC_DC_ERROR;
1182 sc->sc_flags |= SC_DC_FERROR;
1187 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) {
1188 (*sc->sc_rcomp->incomp)(sc->sc_rc_state, m);
1190 if (proto == PPP_CCP) {
1197 for (mp = m; mp != NULL; mp = mp->m_next)
1201 if (sc->sc_flags & SC_VJ_RESET) {
1203 * If we've missed a packet, we must toss subsequent compressed
1204 * packets which don't have an explicit connection ID.
1207 sl_uncompress_tcp(NULL, 0, TYPE_ERROR, sc->sc_comp);
1209 sc->sc_flags &= ~SC_VJ_RESET;
1214 * See if we have a VJ-compressed packet to uncompress.
1216 if (proto == PPP_VJC_COMP) {
1217 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0)
1220 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN,
1221 ilen - PPP_HDRLEN, TYPE_COMPRESSED_TCP,
1222 sc->sc_comp, &iphdr, &hlen);
1225 if (sc->sc_flags & SC_DEBUG)
1226 printf("ppp%d: VJ uncompress failed on type comp\n",
1231 /* Copy the PPP and IP headers into a new mbuf. */
1232 MGET(mp, M_DONTWAIT, MT_DATA);
1237 if (hlen + PPP_HDRLEN > MLEN) {
1239 if (M_TRAILINGSPACE(mp) < hlen + PPP_HDRLEN) {
1241 goto bad; /* lose if big headers and no clusters */
1244 cp = mtod(mp, u_char *);
1250 bcopy(iphdr, cp + PPP_HDRLEN, hlen);
1251 mp->m_len = hlen + PPP_HDRLEN;
1254 * Trim the PPP and VJ headers off the old mbuf
1255 * and stick the new and old mbufs together.
1257 m->m_off += PPP_HDRLEN + xlen;
1258 m->m_len -= PPP_HDRLEN + xlen;
1259 if (m->m_len <= M_TRAILINGSPACE(mp)) {
1260 bcopy(mtod(m, u_char *), mtod(mp, u_char *) + mp->m_len, m->m_len);
1261 mp->m_len += m->m_len;
1262 MFREE(m, mp->m_next);
1266 ilen += hlen - xlen;
1268 } else if (proto == PPP_VJC_UNCOMP) {
1269 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0)
1272 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN,
1273 ilen - PPP_HDRLEN, TYPE_UNCOMPRESSED_TCP,
1274 sc->sc_comp, &iphdr, &hlen);
1277 if (sc->sc_flags & SC_DEBUG)
1278 printf("ppp%d: VJ uncompress failed on type uncomp\n",
1289 * If the packet will fit in an ordinary mbuf, don't waste a
1290 * whole cluster on it.
1292 if (ilen <= MLEN && M_IS_CLUSTER(m)) {
1293 MGET(mp, M_DONTWAIT, MT_DATA);
1295 m_copydata(m, mtod(mp, caddr_t), ilen);
1303 * Record the time that we received this packet.
1305 if ((proto & 0x8000) == 0) {
1306 sc->sc_last_recv = time.tv_sec;
1310 /* See if bpf wants to look at the packet. */
1312 bpf_mtap(sc->sc_bpf, m);
1320 * IP packet - take off the ppp header and pass it up to IP.
1322 if ((ifp->if_flags & IFF_UP) == 0
1323 || sc->sc_npmode[NP_IP] != NPMODE_PASS) {
1324 /* interface is down - drop the packet. */
1328 m->m_off += PPP_HDRLEN;
1329 m->m_len -= PPP_HDRLEN;
1330 schednetisr(NETISR_IP);
1337 * Some other protocol - place on input queue for read().
1345 * Put the packet on the appropriate input queue.
1349 smp_lock(&lock->lk_ifqueue, LK_RETRY);
1350 if (IF_QFULL(inq)) {
1352 smp_unlock(&lock->lk_ifqueue);
1354 if (sc->sc_flags & SC_DEBUG)
1355 printf("ppp%d: input queue full\n", ifp->if_unit);
1358 IF_ENQUEUEIF(inq, m, &sc->sc_if);
1359 smp_unlock(&lock->lk_ifqueue);
1370 sc->sc_if.if_ierrors++;
1371 sc->sc_stats.ppp_ierrors++;
1374 #define MAX_DUMP_BYTES 128
1380 char buf[3*MAX_DUMP_BYTES+4];
1383 static char digits[] = "0123456789abcdef";
1385 for (m = m0; m; m = m->m_next) {
1387 u_char *rptr = mtod(m, u_char *);
1390 if (bp > buf + sizeof(buf) - 4)
1392 *bp++ = digits[*rptr >> 4]; /* convert byte to ascii hex */
1393 *bp++ = digits[*rptr++ & 0xf];
1397 if (bp > buf + sizeof(buf) - 3)
1407 printf("%s\n", buf);
1410 #endif /* NPPP > 0 */