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 1.13 1997/03/04 03:45:17 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 int pppsioctl(struct ifnet *, int, caddr_t);
124 static int pppoutput(struct ifnet *, struct mbuf *, struct sockaddr *);
125 static void ppp_requeue __P((struct ppp_softc *));
126 static void ppp_outpkt __P((struct ppp_softc *));
127 static void ppp_ccp __P((struct ppp_softc *, struct mbuf *m, int rcvd));
128 static void ppp_ccp_closed __P((struct ppp_softc *));
129 static void ppp_inproc __P((struct ppp_softc *, struct mbuf *));
130 static void pppdumpm __P((struct mbuf *m0));
133 * Some useful mbuf macros not in mbuf.h.
135 #define M_IS_CLUSTER(m) ((m)->m_off > MMAXOFF)
137 #define M_TRAILINGSPACE(m) \
138 ((M_IS_CLUSTER(m) ? (u_int)(m)->m_clptr + M_CLUSTERSZ : MSIZE) \
139 - ((m)->m_off + (m)->m_len))
141 #define M_OFFSTART(m) \
142 (M_IS_CLUSTER(m) ? (u_int)(m)->m_clptr : MMINOFF)
144 #define M_DATASIZE(m) \
145 (M_IS_CLUSTER(m) ? M_CLUSTERSZ : MLEN)
148 * The following disgusting hack gets around the problem that IP TOS
149 * can't be set yet. We want to put "interactive" traffic on a high
150 * priority queue. To decide if traffic is interactive, we check that
151 * a) it is TCP and b) one of its ports is telnet, rlogin or ftp control.
153 static u_short interactive_ports[8] = {
157 #define INTERACTIVE(p) (interactive_ports[(p) & 7] == (p))
161 * List of compressors we know about.
164 extern struct compressor ppp_bsd_compress;
165 extern struct compressor ppp_deflate;
167 struct compressor *ppp_compressors[] = {
176 #endif /* PPP_COMPRESS */
180 * Called from boot code to establish ppp interfaces.
185 register struct ppp_softc *sc;
188 for (sc = ppp_softc; i < NPPP; sc++) {
189 sc->sc_if.if_name = "ppp";
190 sc->sc_if.if_unit = i++;
191 sc->sc_if.if_mtu = PPP_MTU;
192 sc->sc_if.if_flags = IFF_POINTOPOINT;
193 sc->sc_if.if_type = IFT_PPP;
194 sc->sc_if.if_ioctl = pppsioctl;
195 sc->sc_if.if_output = pppoutput;
196 sc->sc_if.if_snd.ifq_maxlen = IFQ_MAXLEN;
197 sc->sc_inq.ifq_maxlen = IFQ_MAXLEN;
198 sc->sc_fastq.ifq_maxlen = IFQ_MAXLEN;
199 sc->sc_rawq.ifq_maxlen = IFQ_MAXLEN;
200 if_attach(&sc->sc_if);
202 bpfattach(&sc->sc_bpf, &sc->sc_if, DLT_PPP, PPP_HDRLEN);
208 * Allocate a ppp interface unit and initialize it.
215 struct ppp_softc *sc;
217 for (nppp = 0, sc = ppp_softc; nppp < NPPP; nppp++, sc++)
218 if (sc->sc_xfer == pid) {
222 for (nppp = 0, sc = ppp_softc; nppp < NPPP; nppp++, sc++)
223 if (sc->sc_devp == NULL)
229 sc->sc_mru = PPP_MRU;
230 sc->sc_relinq = NULL;
231 bzero((char *)&sc->sc_stats, sizeof(sc->sc_stats));
233 KM_ALLOC(sc->sc_comp, struct slcompress *, sizeof(struct slcompress),
234 KM_DEVBUF, KM_NOARG);
236 sl_compress_init(sc->sc_comp);
239 sc->sc_xc_state = NULL;
240 sc->sc_rc_state = NULL;
241 #endif /* PPP_COMPRESS */
242 for (i = 0; i < NUM_NP; ++i)
243 sc->sc_npmode[i] = NPMODE_ERROR;
244 sc->sc_npqueue = NULL;
245 sc->sc_npqtail = &sc->sc_npqueue;
246 sc->sc_last_sent = sc->sc_last_recv = time.tv_sec;
252 * Deallocate a ppp unit. Must be called at splnet or higher.
256 struct ppp_softc *sc;
261 sc->sc_if.if_flags &= ~(IFF_UP|IFF_RUNNING);
265 IF_DEQUEUE(&sc->sc_rawq, m);
271 IF_DEQUEUE(&sc->sc_inq, m);
277 IF_DEQUEUE(&sc->sc_fastq, m);
282 while ((m = sc->sc_npqueue) != NULL) {
283 sc->sc_npqueue = m->m_act;
286 if (sc->sc_togo != NULL) {
287 m_freem(sc->sc_togo);
292 sc->sc_xc_state = NULL;
293 sc->sc_rc_state = NULL;
294 #endif /* PPP_COMPRESS */
296 if (sc->sc_comp != 0) {
297 KM_FREE(sc->sc_comp, KM_DEVBUF);
304 * Ioctl routine for generic ppp devices.
307 pppioctl(sc, cmd, data, flag)
308 struct ppp_softc *sc;
312 struct proc *p = u.u_procp;
313 int s, error, flags, mru, mtu, nb, npx;
314 struct ppp_option_data *odp;
315 struct compressor **cp;
319 u_char ccp_option[CCP_MAX_OPTION_LENGTH];
324 *(int *)data = sc->sc_inq.ifq_len;
328 *(int *)data = sc->sc_if.if_unit;
332 *(u_int *)data = sc->sc_flags;
338 flags = *(int *)data & SC_MASK;
341 if (sc->sc_flags & SC_CCP_OPEN && !(flags & SC_CCP_OPEN))
345 sc->sc_flags = (sc->sc_flags & ~SC_MASK) | flags;
353 if (mru >= PPP_MRU && mru <= PPP_MAXMRU)
358 *(int *)data = sc->sc_mru;
362 * PPPIOC[GS]MTU are implemented here, instead of supporting
363 * SIOC[GS]IFMTU in pppsioctl, because under Ultrix, we can't get an
364 * interface ioctl through to the interface until it has an IP
371 if (mtu <= 0 || mtu > PPP_MAXMRU)
374 sc->sc_if.if_mtu = mtu;
379 *(int *) data = sc->sc_if.if_mtu;
388 sl_compress_setup(sc->sc_comp, *(int *)data);
397 sc->sc_xfer = p->p_pid;
401 case PPPIOCSCOMPRESS:
404 odp = (struct ppp_option_data *) data;
406 if (nb > sizeof(ccp_option))
407 nb = sizeof(ccp_option);
408 if ((error = copyin(odp->ptr, ccp_option, nb)) != 0)
410 if (ccp_option[1] < 2) /* preliminary check on the length byte */
412 for (cp = ppp_compressors; *cp != NULL; ++cp)
413 if ((*cp)->compress_proto == ccp_option[0]) {
415 * Found a handler for the protocol - try to allocate
416 * a compressor or decompressor.
421 if (sc->sc_xc_state != NULL)
422 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state);
424 sc->sc_xc_state = (*cp)->comp_alloc(ccp_option, nb);
425 if (sc->sc_xc_state == NULL) {
426 if (sc->sc_flags & SC_DEBUG)
427 printf("ppp%d: comp_alloc failed\n",
432 sc->sc_flags &= ~SC_COMP_RUN;
436 if (sc->sc_rc_state != NULL)
437 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state);
439 sc->sc_rc_state = (*cp)->decomp_alloc(ccp_option, nb);
440 if (sc->sc_rc_state == NULL) {
441 if (sc->sc_flags & SC_DEBUG)
442 printf("ppp%d: decomp_alloc failed\n",
447 sc->sc_flags &= ~SC_DECOMP_RUN;
452 if (sc->sc_flags & SC_DEBUG)
453 printf("ppp%d: no compressor for [%x %x %x], %x\n",
454 sc->sc_if.if_unit, ccp_option[0], ccp_option[1],
456 return (EINVAL); /* no handler found */
457 #endif /* PPP_COMPRESS */
461 npi = (struct npioctl *) data;
462 switch (npi->protocol) {
469 if (cmd == PPPIOCGNPMODE) {
470 npi->mode = sc->sc_npmode[npx];
474 if (npi->mode != sc->sc_npmode[npx]) {
476 sc->sc_npmode[npx] = npi->mode;
477 if (npi->mode != NPMODE_QUEUE) {
489 ((struct ppp_idle *)data)->xmit_idle = t - sc->sc_last_sent;
490 ((struct ppp_idle *)data)->recv_idle = t - sc->sc_last_recv;
501 * Process an ioctl request to the ppp network interface.
504 pppsioctl(ifp, cmd, data)
505 register struct ifnet *ifp;
509 struct proc *p = u.u_procp;
510 register struct ppp_softc *sc = &ppp_softc[ifp->if_unit];
511 register struct ifaddr *ifa = (struct ifaddr *)data;
512 register struct ifreq *ifr = (struct ifreq *)data;
513 struct ppp_stats *psp;
515 struct ppp_comp_stats *pcp;
517 int s = splimp(), error = 0;
521 if ((ifp->if_flags & IFF_RUNNING) == 0)
522 ifp->if_flags &= ~IFF_UP;
526 if (ifa->ifa_addr.sa_family != AF_INET)
527 error = EAFNOSUPPORT;
531 if (ifa->ifa_addr.sa_family != AF_INET)
532 error = EAFNOSUPPORT;
536 * Ioctls other than the above don't get through until the
537 * interface has its IP addresses set :-(
544 sc->sc_if.if_mtu = ifr->ifr_mtu;
548 ifr->ifr_mtu = sc->sc_if.if_mtu;
553 psp = &((struct ifpppstatsreq *) data)->stats;
554 bzero(psp, sizeof(*psp));
555 psp->p = sc->sc_stats;
556 #if defined(VJC) && !defined(SL_NO_STATS)
558 psp->vj.vjs_packets = sc->sc_comp->sls_packets;
559 psp->vj.vjs_compressed = sc->sc_comp->sls_compressed;
560 psp->vj.vjs_searches = sc->sc_comp->sls_searches;
561 psp->vj.vjs_misses = sc->sc_comp->sls_misses;
562 psp->vj.vjs_uncompressedin = sc->sc_comp->sls_uncompressedin;
563 psp->vj.vjs_compressedin = sc->sc_comp->sls_compressedin;
564 psp->vj.vjs_errorin = sc->sc_comp->sls_errorin;
565 psp->vj.vjs_tossed = sc->sc_comp->sls_tossed;
572 pcp = &((struct ifpppcstatsreq *) data)->stats;
573 bzero(pcp, sizeof(*pcp));
574 if (sc->sc_xc_state != NULL)
575 (*sc->sc_xcomp->comp_stat)(sc->sc_xc_state, &pcp->c);
576 if (sc->sc_rc_state != NULL)
577 (*sc->sc_rcomp->decomp_stat)(sc->sc_rc_state, &pcp->d);
579 #endif /* PPP_COMPRESS */
589 * Queue a packet. Start transmission if not active.
590 * Packet is placed in Information field of PPP frame.
593 pppoutput(ifp, m0, dst)
596 struct sockaddr *dst;
598 register struct ppp_softc *sc = &ppp_softc[ifp->if_unit];
599 int protocol, address, control;
608 if (sc->sc_devp == NULL || (ifp->if_flags & IFF_RUNNING) == 0
609 || ((ifp->if_flags & IFF_UP) == 0 && dst->sa_family != AF_UNSPEC)) {
610 error = ENETDOWN; /* sort of */
615 * Compute PPP header.
616 * We use the m_context field of the mbuf to indicate whether
617 * the packet should go on the fast queue.
620 switch (dst->sa_family) {
623 address = PPP_ALLSTATIONS;
626 mode = sc->sc_npmode[NP_IP];
629 * If this is a TCP packet to or from an "interactive" port,
630 * put the packet on the fastq instead.
632 if ((ip = mtod(m0, struct ip *))->ip_p == IPPROTO_TCP) {
633 register int p = ntohl(((int *)ip)[ip->ip_hl]);
634 if (INTERACTIVE(p & 0xffff) || INTERACTIVE(p >> 16))
640 address = PPP_ADDRESS(dst->sa_data);
641 control = PPP_CONTROL(dst->sa_data);
642 protocol = PPP_PROTOCOL(dst->sa_data);
646 printf("ppp%d: af%d not supported\n", ifp->if_unit, dst->sa_family);
647 error = EAFNOSUPPORT;
652 * Drop this packet, or return an error, if necessary.
654 if (mode == NPMODE_ERROR) {
658 if (mode == NPMODE_DROP) {
664 * Add PPP header. If no space in first mbuf, allocate another.
666 if (M_IS_CLUSTER(m0) || m0->m_off < MMINOFF + PPP_HDRLEN) {
669 MGET(m, M_DONTWAIT, MT_DATA);
678 m0->m_off -= PPP_HDRLEN;
680 cp = mtod(m0, u_char *);
683 *cp++ = protocol >> 8;
684 *cp++ = protocol & 0xff;
685 m0->m_len += PPP_HDRLEN;
688 for (m = m0; m != 0; m = m->m_next)
691 if (sc->sc_flags & SC_LOG_OUTPKT) {
692 printf("ppp%d output: ", ifp->if_unit);
696 if ((protocol & 0x8000) == 0) {
698 * Update the time we sent the most recent data packet.
700 sc->sc_last_sent = time.tv_sec;
705 * See if bpf wants to look at the packet.
708 bpf_mtap(sc->sc_bpf, m0);
712 * Put the packet on the appropriate queue.
715 if (mode == NPMODE_QUEUE) {
716 /* XXX we should limit the number of packets on this queue */
717 *sc->sc_npqtail = m0;
719 sc->sc_npqtail = &m0->m_act;
721 ifq = m0->m_context? &sc->sc_fastq: &ifp->if_snd;
722 if (IF_QFULL(ifq) && dst->sa_family != AF_UNSPEC) {
725 sc->sc_if.if_oerrors++;
726 sc->sc_stats.ppp_oerrors++;
744 * After a change in the NPmode for some NP, move packets from the
745 * npqueue to the send queue or the fast queue as appropriate.
746 * Should be called at splnet.
750 struct ppp_softc *sc;
752 struct mbuf *m, **mpp;
756 for (mpp = &sc->sc_npqueue; (m = *mpp) != NULL; ) {
757 switch (PPP_PROTOCOL(mtod(m, u_char *))) {
759 mode = sc->sc_npmode[NP_IP];
768 * This packet can now go on one of the queues to be sent.
772 ifq = m->m_context? &sc->sc_fastq: &sc->sc_if.if_snd;
775 sc->sc_if.if_oerrors++;
776 sc->sc_stats.ppp_oerrors++;
792 sc->sc_npqtail = mpp;
796 * Transmitter has finished outputting some stuff;
797 * remember to call sc->sc_start later at splnet.
801 struct ppp_softc *sc;
805 sc->sc_flags &= ~SC_TBUSY;
806 schednetisr(NETISR_PPP);
811 * Get a packet to send. This procedure is intended to be called at
812 * splnet, since it may involve time-consuming operations such as
813 * applying VJ compression, packet compression, address/control and/or
814 * protocol field compression to the packet.
818 struct ppp_softc *sc;
822 int address, control, protocol;
826 * Grab a packet to send: first try the fast queue, then the
829 IF_DEQUEUE(&sc->sc_fastq, m);
831 IF_DEQUEUE(&sc->sc_if.if_snd, m);
835 ++sc->sc_stats.ppp_opackets;
838 * Extract the ppp header of the new packet.
839 * The ppp header will be in one mbuf.
841 cp = mtod(m, u_char *);
842 address = PPP_ADDRESS(cp);
843 control = PPP_CONTROL(cp);
844 protocol = PPP_PROTOCOL(cp);
850 * If the packet is a TCP/IP packet, see if we can compress it.
852 if ((sc->sc_flags & SC_COMP_TCP) && sc->sc_comp != NULL) {
857 ip = (struct ip *) (cp + PPP_HDRLEN);
858 if (mp->m_len <= PPP_HDRLEN) {
862 ip = mtod(mp, struct ip *);
864 /* this code assumes the IP/TCP header is in one non-shared mbuf */
865 if (ip->ip_p == IPPROTO_TCP) {
866 type = sl_compress_tcp(mp, ip, sc->sc_comp,
867 !(sc->sc_flags & SC_NO_TCP_CCID));
869 case TYPE_UNCOMPRESSED_TCP:
870 protocol = PPP_VJC_UNCOMP;
872 case TYPE_COMPRESSED_TCP:
873 protocol = PPP_VJC_COMP;
874 cp = mtod(m, u_char *);
875 cp[0] = address; /* header has moved */
880 cp[3] = protocol; /* update protocol in PPP header */
890 #endif /* PPP_COMPRESS */
894 if (protocol != PPP_LCP && protocol != PPP_CCP
895 && sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) {
896 struct mbuf *mcomp = NULL;
900 for (mp = m; mp != NULL; mp = mp->m_next)
902 clen = (*sc->sc_xcomp->compress)
903 (sc->sc_xc_state, &mcomp, m, slen, sc->sc_if.if_mtu + PPP_HDRLEN);
905 if (sc->sc_flags & SC_CCP_UP) {
906 /* Send the compressed packet instead of the original. */
909 cp = mtod(m, u_char *);
912 /* Can't transmit compressed packets until CCP is up. */
917 #endif /* PPP_COMPRESS */
920 * Compress the address/control and protocol, if possible.
922 if (sc->sc_flags & SC_COMP_AC && address == PPP_ALLSTATIONS &&
923 control == PPP_UI && protocol != PPP_ALLSTATIONS &&
924 protocol != PPP_LCP) {
925 /* can compress address/control */
929 if (sc->sc_flags & SC_COMP_PROT && protocol < 0xFF) {
930 /* can compress protocol */
931 if (mtod(m, u_char *) == cp) {
932 cp[2] = cp[1]; /* move address/control up */
943 * Software interrupt routine, called at splnet.
948 struct ppp_softc *sc;
954 for (i = 0; i < NPPP; ++i, ++sc) {
955 if (!(sc->sc_flags & SC_TBUSY)
956 && (sc->sc_if.if_snd.ifq_head || sc->sc_fastq.ifq_head)) {
958 sc->sc_flags |= SC_TBUSY;
964 IF_DEQUEUE(&sc->sc_rawq, m);
976 * Handle a CCP packet. `rcvd' is 1 if the packet was received,
977 * 0 if it is about to be transmitted.
981 struct ppp_softc *sc;
990 * Get a pointer to the data after the PPP header.
992 if (m->m_len <= PPP_HDRLEN) {
996 dp = (mp != NULL)? mtod(mp, u_char *): NULL;
999 dp = mtod(mp, u_char *) + PPP_HDRLEN;
1002 ep = mtod(mp, u_char *) + mp->m_len;
1003 if (dp + CCP_HDRLEN > ep)
1005 slen = CCP_LENGTH(dp);
1006 if (dp + slen > ep) {
1007 if (sc->sc_flags & SC_DEBUG)
1008 printf("if_ppp/ccp: not enough data in mbuf (%x+%x > %x+%x)\n",
1009 dp, slen, mtod(mp, u_char *), mp->m_len);
1013 switch (CCP_CODE(dp)) {
1017 /* CCP must be going down - disable compression */
1018 if (sc->sc_flags & SC_CCP_UP) {
1020 sc->sc_flags &= ~(SC_CCP_UP | SC_COMP_RUN | SC_DECOMP_RUN);
1026 if (sc->sc_flags & SC_CCP_OPEN && !(sc->sc_flags & SC_CCP_UP)
1027 && slen >= CCP_HDRLEN + CCP_OPT_MINLEN
1028 && slen >= CCP_OPT_LENGTH(dp + CCP_HDRLEN) + CCP_HDRLEN) {
1030 /* we're agreeing to send compressed packets. */
1031 if (sc->sc_xc_state != NULL
1032 && (*sc->sc_xcomp->comp_init)
1033 (sc->sc_xc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN,
1034 sc->sc_if.if_unit, 0, sc->sc_flags & SC_DEBUG)) {
1036 sc->sc_flags |= SC_COMP_RUN;
1040 /* peer is agreeing to send compressed packets. */
1041 if (sc->sc_rc_state != NULL
1042 && (*sc->sc_rcomp->decomp_init)
1043 (sc->sc_rc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN,
1044 sc->sc_if.if_unit, 0, sc->sc_mru,
1045 sc->sc_flags & SC_DEBUG)) {
1047 sc->sc_flags |= SC_DECOMP_RUN;
1048 sc->sc_flags &= ~(SC_DC_ERROR | SC_DC_FERROR);
1056 if (sc->sc_flags & SC_CCP_UP) {
1058 if (sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN))
1059 (*sc->sc_xcomp->comp_reset)(sc->sc_xc_state);
1061 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) {
1062 (*sc->sc_rcomp->decomp_reset)(sc->sc_rc_state);
1064 sc->sc_flags &= ~SC_DC_ERROR;
1074 * CCP is down; free (de)compressor state if necessary.
1078 struct ppp_softc *sc;
1080 if (sc->sc_xc_state) {
1081 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state);
1082 sc->sc_xc_state = NULL;
1084 if (sc->sc_rc_state) {
1085 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state);
1086 sc->sc_rc_state = NULL;
1089 #endif /* PPP_COMPRESS */
1092 * PPP packet input routine.
1093 * The caller has checked and removed the FCS and has inserted
1094 * the address/control bytes and the protocol high byte if they
1098 ppppktin(sc, m, lost)
1099 struct ppp_softc *sc;
1105 m->m_context = lost;
1106 IF_ENQUEUE(&sc->sc_rawq, m);
1107 schednetisr(NETISR_PPP);
1112 * Process a received PPP packet, doing decompression as necessary.
1113 * Should be called at splnet.
1115 #define COMPTYPE(proto) ((proto) == PPP_VJC_COMP? TYPE_COMPRESSED_TCP: \
1116 TYPE_UNCOMPRESSED_TCP)
1120 struct ppp_softc *sc;
1123 struct ifnet *ifp = &sc->sc_if;
1124 struct ifqueue *inq, *lock;
1125 int s, ilen, xlen, proto, rv;
1126 u_char *cp, adrs, ctrl;
1127 struct mbuf *mp, *dmp = NULL, *pc;
1131 sc->sc_stats.ppp_ipackets++;
1133 if (sc->sc_flags & SC_LOG_INPKT) {
1135 for (mp = m; mp != NULL; mp = mp->m_next)
1137 printf("ppp%d: got %d bytes\n", ifp->if_unit, ilen);
1141 cp = mtod(m, u_char *);
1142 adrs = PPP_ADDRESS(cp);
1143 ctrl = PPP_CONTROL(cp);
1144 proto = PPP_PROTOCOL(cp);
1148 sc->sc_flags |= SC_VJ_RESET;
1154 * Decompress this packet if necessary, update the receiver's
1155 * dictionary, or take appropriate action on a CCP packet.
1157 if (proto == PPP_COMP && sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)
1158 && !(sc->sc_flags & SC_DC_ERROR) && !(sc->sc_flags & SC_DC_FERROR)) {
1159 /* decompress this packet */
1160 rv = (*sc->sc_rcomp->decompress)(sc->sc_rc_state, m, &dmp);
1161 if (rv == DECOMP_OK) {
1164 /* no error, but no decompressed packet produced */
1168 cp = mtod(m, u_char *);
1169 proto = PPP_PROTOCOL(cp);
1173 * An error has occurred in decompression.
1174 * Pass the compressed packet up to pppd, which may take
1175 * CCP down or issue a Reset-Req.
1177 if (sc->sc_flags & SC_DEBUG)
1178 printf("ppp%d: decompress failed %d\n", ifp->if_unit, rv);
1180 sc->sc_flags |= SC_VJ_RESET;
1181 if (rv == DECOMP_ERROR)
1182 sc->sc_flags |= SC_DC_ERROR;
1184 sc->sc_flags |= SC_DC_FERROR;
1189 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) {
1190 (*sc->sc_rcomp->incomp)(sc->sc_rc_state, m);
1192 if (proto == PPP_CCP) {
1199 for (mp = m; mp != NULL; mp = mp->m_next)
1203 if (sc->sc_flags & SC_VJ_RESET) {
1205 * If we've missed a packet, we must toss subsequent compressed
1206 * packets which don't have an explicit connection ID.
1209 sl_uncompress_tcp(NULL, 0, TYPE_ERROR, sc->sc_comp);
1211 sc->sc_flags &= ~SC_VJ_RESET;
1216 * See if we have a VJ-compressed packet to uncompress.
1218 if (proto == PPP_VJC_COMP) {
1219 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0)
1222 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN,
1223 ilen - PPP_HDRLEN, TYPE_COMPRESSED_TCP,
1224 sc->sc_comp, &iphdr, &hlen);
1227 if (sc->sc_flags & SC_DEBUG)
1228 printf("ppp%d: VJ uncompress failed on type comp\n",
1233 /* Copy the PPP and IP headers into a new mbuf. */
1234 MGET(mp, M_DONTWAIT, MT_DATA);
1239 if (hlen + PPP_HDRLEN > MLEN) {
1241 if (M_TRAILINGSPACE(mp) < hlen + PPP_HDRLEN) {
1243 goto bad; /* lose if big headers and no clusters */
1246 cp = mtod(mp, u_char *);
1252 bcopy(iphdr, cp + PPP_HDRLEN, hlen);
1253 mp->m_len = hlen + PPP_HDRLEN;
1256 * Trim the PPP and VJ headers off the old mbuf
1257 * and stick the new and old mbufs together.
1259 m->m_off += PPP_HDRLEN + xlen;
1260 m->m_len -= PPP_HDRLEN + xlen;
1261 if (m->m_len <= M_TRAILINGSPACE(mp)) {
1262 bcopy(mtod(m, u_char *), mtod(mp, u_char *) + mp->m_len, m->m_len);
1263 mp->m_len += m->m_len;
1264 MFREE(m, mp->m_next);
1268 ilen += hlen - xlen;
1270 } else if (proto == PPP_VJC_UNCOMP) {
1271 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0)
1274 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN,
1275 ilen - PPP_HDRLEN, TYPE_UNCOMPRESSED_TCP,
1276 sc->sc_comp, &iphdr, &hlen);
1279 if (sc->sc_flags & SC_DEBUG)
1280 printf("ppp%d: VJ uncompress failed on type uncomp\n",
1291 * If the packet will fit in an ordinary mbuf, don't waste a
1292 * whole cluster on it.
1294 if (ilen <= MLEN && M_IS_CLUSTER(m)) {
1295 MGET(mp, M_DONTWAIT, MT_DATA);
1297 m_copydata(m, mtod(mp, caddr_t), ilen);
1305 * Record the time that we received this packet.
1307 if ((proto & 0x8000) == 0) {
1308 sc->sc_last_recv = time.tv_sec;
1312 /* See if bpf wants to look at the packet. */
1314 bpf_mtap(sc->sc_bpf, m);
1322 * IP packet - take off the ppp header and pass it up to IP.
1324 if ((ifp->if_flags & IFF_UP) == 0
1325 || sc->sc_npmode[NP_IP] != NPMODE_PASS) {
1326 /* interface is down - drop the packet. */
1330 m->m_off += PPP_HDRLEN;
1331 m->m_len -= PPP_HDRLEN;
1332 schednetisr(NETISR_IP);
1339 * Some other protocol - place on input queue for read().
1347 * Put the packet on the appropriate input queue.
1351 smp_lock(&lock->lk_ifqueue, LK_RETRY);
1352 if (IF_QFULL(inq)) {
1354 smp_unlock(&lock->lk_ifqueue);
1356 if (sc->sc_flags & SC_DEBUG)
1357 printf("ppp%d: input queue full\n", ifp->if_unit);
1360 IF_ENQUEUEIF(inq, m, &sc->sc_if);
1361 smp_unlock(&lock->lk_ifqueue);
1372 sc->sc_if.if_ierrors++;
1373 sc->sc_stats.ppp_ierrors++;
1376 #define MAX_DUMP_BYTES 128
1382 char buf[3*MAX_DUMP_BYTES+4];
1385 static char digits[] = "0123456789abcdef";
1387 for (m = m0; m; m = m->m_next) {
1389 u_char *rptr = mtod(m, u_char *);
1392 if (bp > buf + sizeof(buf) - 4)
1394 *bp++ = digits[*rptr >> 4]; /* convert byte to ascii hex */
1395 *bp++ = digits[*rptr++ & 0xf];
1399 if (bp > buf + sizeof(buf) - 3)
1409 printf("%s\n", buf);
1412 #endif /* NPPP > 0 */