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 1.15 1998/03/25 03:11:35 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 void ppp_requeue __P((struct ppp_softc *));
125 static void ppp_outpkt __P((struct ppp_softc *));
126 static void ppp_ccp __P((struct ppp_softc *, struct mbuf *m, int rcvd));
127 static void ppp_ccp_closed __P((struct ppp_softc *));
128 static void ppp_inproc __P((struct ppp_softc *, struct mbuf *));
129 static void pppdumpm __P((struct mbuf *m0));
132 * Some useful mbuf macros not in mbuf.h.
134 #define M_IS_CLUSTER(m) ((m)->m_off > MMAXOFF)
136 #define M_TRAILINGSPACE(m) \
137 ((M_IS_CLUSTER(m) ? (u_int)(m)->m_clptr + M_CLUSTERSZ : MSIZE) \
138 - ((m)->m_off + (m)->m_len))
140 #define M_OFFSTART(m) \
141 (M_IS_CLUSTER(m) ? (u_int)(m)->m_clptr : MMINOFF)
143 #define M_DATASIZE(m) \
144 (M_IS_CLUSTER(m) ? M_CLUSTERSZ : MLEN)
147 * The following disgusting hack gets around the problem that IP TOS
148 * can't be set yet. We want to put "interactive" traffic on a high
149 * priority queue. To decide if traffic is interactive, we check that
150 * a) it is TCP and b) one of its ports is telnet, rlogin or ftp control.
152 static u_short interactive_ports[8] = {
156 #define INTERACTIVE(p) (interactive_ports[(p) & 7] == (p))
160 * List of compressors we know about.
163 extern struct compressor ppp_bsd_compress;
164 extern struct compressor ppp_deflate;
165 extern struct compressor ppp_deflate_draft;
167 struct compressor *ppp_compressors[] = {
177 #endif /* PPP_COMPRESS */
181 * Called from boot code to establish ppp interfaces.
186 register struct ppp_softc *sc;
189 for (sc = ppp_softc; i < NPPP; sc++) {
190 sc->sc_if.if_name = "ppp";
191 sc->sc_if.if_unit = i++;
192 sc->sc_if.if_mtu = PPP_MTU;
193 sc->sc_if.if_flags = IFF_POINTOPOINT;
194 sc->sc_if.if_type = IFT_PPP;
195 sc->sc_if.if_ioctl = pppsioctl;
196 sc->sc_if.if_output = pppoutput;
197 sc->sc_if.if_snd.ifq_maxlen = IFQ_MAXLEN;
198 sc->sc_inq.ifq_maxlen = IFQ_MAXLEN;
199 sc->sc_fastq.ifq_maxlen = IFQ_MAXLEN;
200 sc->sc_rawq.ifq_maxlen = IFQ_MAXLEN;
201 if_attach(&sc->sc_if);
203 bpfattach(&sc->sc_bpf, &sc->sc_if, DLT_PPP, PPP_HDRLEN);
209 * Allocate a ppp interface unit and initialize it.
216 struct ppp_softc *sc;
218 for (nppp = 0, sc = ppp_softc; nppp < NPPP; nppp++, sc++)
219 if (sc->sc_xfer == pid) {
223 for (nppp = 0, sc = ppp_softc; nppp < NPPP; nppp++, sc++)
224 if (sc->sc_devp == NULL)
230 sc->sc_mru = PPP_MRU;
231 sc->sc_relinq = NULL;
232 bzero((char *)&sc->sc_stats, sizeof(sc->sc_stats));
234 KM_ALLOC(sc->sc_comp, struct slcompress *, sizeof(struct slcompress),
235 KM_DEVBUF, KM_NOARG);
237 sl_compress_init(sc->sc_comp);
240 sc->sc_xc_state = NULL;
241 sc->sc_rc_state = NULL;
242 #endif /* PPP_COMPRESS */
243 for (i = 0; i < NUM_NP; ++i)
244 sc->sc_npmode[i] = NPMODE_ERROR;
245 sc->sc_npqueue = NULL;
246 sc->sc_npqtail = &sc->sc_npqueue;
247 sc->sc_last_sent = sc->sc_last_recv = time.tv_sec;
253 * Deallocate a ppp unit. Must be called at splnet or higher.
257 struct ppp_softc *sc;
262 sc->sc_if.if_flags &= ~(IFF_UP|IFF_RUNNING);
266 IF_DEQUEUE(&sc->sc_rawq, m);
272 IF_DEQUEUE(&sc->sc_inq, m);
278 IF_DEQUEUE(&sc->sc_fastq, m);
283 while ((m = sc->sc_npqueue) != NULL) {
284 sc->sc_npqueue = m->m_act;
287 if (sc->sc_togo != NULL) {
288 m_freem(sc->sc_togo);
293 sc->sc_xc_state = NULL;
294 sc->sc_rc_state = NULL;
295 #endif /* PPP_COMPRESS */
297 if (sc->sc_comp != 0) {
298 KM_FREE(sc->sc_comp, KM_DEVBUF);
305 * Ioctl routine for generic ppp devices.
308 pppioctl(sc, cmd, data, flag)
309 struct ppp_softc *sc;
313 struct proc *p = u.u_procp;
314 int s, error, flags, mru, mtu, nb, npx;
315 struct ppp_option_data *odp;
316 struct compressor **cp;
320 u_char ccp_option[CCP_MAX_OPTION_LENGTH];
325 *(int *)data = sc->sc_inq.ifq_len;
329 *(int *)data = sc->sc_if.if_unit;
333 *(u_int *)data = sc->sc_flags;
339 flags = *(int *)data & SC_MASK;
342 if (sc->sc_flags & SC_CCP_OPEN && !(flags & SC_CCP_OPEN))
346 sc->sc_flags = (sc->sc_flags & ~SC_MASK) | flags;
354 if (mru >= PPP_MRU && mru <= PPP_MAXMRU)
359 *(int *)data = sc->sc_mru;
363 * PPPIOC[GS]MTU are implemented here, instead of supporting
364 * SIOC[GS]IFMTU in pppsioctl, because under Ultrix, we can't get an
365 * interface ioctl through to the interface until it has an IP
372 if (mtu <= 0 || mtu > PPP_MAXMRU)
375 sc->sc_if.if_mtu = mtu;
380 *(int *) data = sc->sc_if.if_mtu;
389 sl_compress_setup(sc->sc_comp, *(int *)data);
398 sc->sc_xfer = p->p_pid;
402 case PPPIOCSCOMPRESS:
405 odp = (struct ppp_option_data *) data;
407 if (nb > sizeof(ccp_option))
408 nb = sizeof(ccp_option);
409 if ((error = copyin(odp->ptr, ccp_option, nb)) != 0)
411 if (ccp_option[1] < 2) /* preliminary check on the length byte */
413 for (cp = ppp_compressors; *cp != NULL; ++cp)
414 if ((*cp)->compress_proto == ccp_option[0]) {
416 * Found a handler for the protocol - try to allocate
417 * a compressor or decompressor.
422 if (sc->sc_xc_state != NULL)
423 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state);
425 sc->sc_xc_state = (*cp)->comp_alloc(ccp_option, nb);
426 if (sc->sc_xc_state == NULL) {
427 if (sc->sc_flags & SC_DEBUG)
428 printf("ppp%d: comp_alloc failed\n",
433 sc->sc_flags &= ~SC_COMP_RUN;
437 if (sc->sc_rc_state != NULL)
438 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state);
440 sc->sc_rc_state = (*cp)->decomp_alloc(ccp_option, nb);
441 if (sc->sc_rc_state == NULL) {
442 if (sc->sc_flags & SC_DEBUG)
443 printf("ppp%d: decomp_alloc failed\n",
448 sc->sc_flags &= ~SC_DECOMP_RUN;
453 if (sc->sc_flags & SC_DEBUG)
454 printf("ppp%d: no compressor for [%x %x %x], %x\n",
455 sc->sc_if.if_unit, ccp_option[0], ccp_option[1],
457 return (EINVAL); /* no handler found */
458 #endif /* PPP_COMPRESS */
462 npi = (struct npioctl *) data;
463 switch (npi->protocol) {
470 if (cmd == PPPIOCGNPMODE) {
471 npi->mode = sc->sc_npmode[npx];
475 if (npi->mode != sc->sc_npmode[npx]) {
477 sc->sc_npmode[npx] = npi->mode;
478 if (npi->mode != NPMODE_QUEUE) {
490 ((struct ppp_idle *)data)->xmit_idle = t - sc->sc_last_sent;
491 ((struct ppp_idle *)data)->recv_idle = t - sc->sc_last_recv;
502 * Process an ioctl request to the ppp network interface.
505 pppsioctl(ifp, cmd, data)
506 register struct ifnet *ifp;
510 struct proc *p = u.u_procp;
511 register struct ppp_softc *sc = &ppp_softc[ifp->if_unit];
512 register struct ifaddr *ifa = (struct ifaddr *)data;
513 register struct ifreq *ifr = (struct ifreq *)data;
514 struct ppp_stats *psp;
516 struct ppp_comp_stats *pcp;
518 int s = splimp(), error = 0;
522 if ((ifp->if_flags & IFF_RUNNING) == 0)
523 ifp->if_flags &= ~IFF_UP;
527 if (ifa->ifa_addr.sa_family != AF_INET)
528 error = EAFNOSUPPORT;
532 if (ifa->ifa_addr.sa_family != AF_INET)
533 error = EAFNOSUPPORT;
537 * Ioctls other than the above don't get through until the
538 * interface has its IP addresses set :-(
545 sc->sc_if.if_mtu = ifr->ifr_mtu;
549 ifr->ifr_mtu = sc->sc_if.if_mtu;
554 psp = &((struct ifpppstatsreq *) data)->stats;
555 bzero(psp, sizeof(*psp));
556 psp->p = sc->sc_stats;
557 #if defined(VJC) && !defined(SL_NO_STATS)
559 psp->vj.vjs_packets = sc->sc_comp->sls_packets;
560 psp->vj.vjs_compressed = sc->sc_comp->sls_compressed;
561 psp->vj.vjs_searches = sc->sc_comp->sls_searches;
562 psp->vj.vjs_misses = sc->sc_comp->sls_misses;
563 psp->vj.vjs_uncompressedin = sc->sc_comp->sls_uncompressedin;
564 psp->vj.vjs_compressedin = sc->sc_comp->sls_compressedin;
565 psp->vj.vjs_errorin = sc->sc_comp->sls_errorin;
566 psp->vj.vjs_tossed = sc->sc_comp->sls_tossed;
573 pcp = &((struct ifpppcstatsreq *) data)->stats;
574 bzero(pcp, sizeof(*pcp));
575 if (sc->sc_xc_state != NULL)
576 (*sc->sc_xcomp->comp_stat)(sc->sc_xc_state, &pcp->c);
577 if (sc->sc_rc_state != NULL)
578 (*sc->sc_rcomp->decomp_stat)(sc->sc_rc_state, &pcp->d);
580 #endif /* PPP_COMPRESS */
590 * Queue a packet. Start transmission if not active.
591 * Packet is placed in Information field of PPP frame.
594 pppoutput(ifp, m0, dst)
597 struct sockaddr *dst;
599 register struct ppp_softc *sc = &ppp_softc[ifp->if_unit];
600 int protocol, address, control;
609 if (sc->sc_devp == NULL || (ifp->if_flags & IFF_RUNNING) == 0
610 || ((ifp->if_flags & IFF_UP) == 0 && dst->sa_family != AF_UNSPEC)) {
611 error = ENETDOWN; /* sort of */
616 * Compute PPP header.
617 * We use the m_context field of the mbuf to indicate whether
618 * the packet should go on the fast queue.
621 switch (dst->sa_family) {
624 address = PPP_ALLSTATIONS;
627 mode = sc->sc_npmode[NP_IP];
630 * If this is a TCP packet to or from an "interactive" port,
631 * put the packet on the fastq instead.
633 if ((ip = mtod(m0, struct ip *))->ip_p == IPPROTO_TCP) {
634 register int p = ntohl(((int *)ip)[ip->ip_hl]);
635 if (INTERACTIVE(p & 0xffff) || INTERACTIVE(p >> 16))
641 address = PPP_ADDRESS(dst->sa_data);
642 control = PPP_CONTROL(dst->sa_data);
643 protocol = PPP_PROTOCOL(dst->sa_data);
647 printf("ppp%d: af%d not supported\n", ifp->if_unit, dst->sa_family);
648 error = EAFNOSUPPORT;
653 * Drop this packet, or return an error, if necessary.
655 if (mode == NPMODE_ERROR) {
659 if (mode == NPMODE_DROP) {
665 * Add PPP header. If no space in first mbuf, allocate another.
667 if (M_IS_CLUSTER(m0) || m0->m_off < MMINOFF + PPP_HDRLEN) {
670 MGET(m, M_DONTWAIT, MT_DATA);
679 m0->m_off -= PPP_HDRLEN;
681 cp = mtod(m0, u_char *);
684 *cp++ = protocol >> 8;
685 *cp++ = protocol & 0xff;
686 m0->m_len += PPP_HDRLEN;
689 for (m = m0; m != 0; m = m->m_next)
692 if (sc->sc_flags & SC_LOG_OUTPKT) {
693 printf("ppp%d output: ", ifp->if_unit);
697 if ((protocol & 0x8000) == 0) {
699 * Update the time we sent the most recent data packet.
701 sc->sc_last_sent = time.tv_sec;
706 * See if bpf wants to look at the packet.
709 bpf_mtap(sc->sc_bpf, m0);
713 * Put the packet on the appropriate queue.
716 if (mode == NPMODE_QUEUE) {
717 /* XXX we should limit the number of packets on this queue */
718 *sc->sc_npqtail = m0;
720 sc->sc_npqtail = &m0->m_act;
722 ifq = m0->m_context? &sc->sc_fastq: &ifp->if_snd;
723 if (IF_QFULL(ifq) && dst->sa_family != AF_UNSPEC) {
726 sc->sc_if.if_oerrors++;
727 sc->sc_stats.ppp_oerrors++;
745 * After a change in the NPmode for some NP, move packets from the
746 * npqueue to the send queue or the fast queue as appropriate.
747 * Should be called at splnet.
751 struct ppp_softc *sc;
753 struct mbuf *m, **mpp;
757 for (mpp = &sc->sc_npqueue; (m = *mpp) != NULL; ) {
758 switch (PPP_PROTOCOL(mtod(m, u_char *))) {
760 mode = sc->sc_npmode[NP_IP];
769 * This packet can now go on one of the queues to be sent.
773 ifq = m->m_context? &sc->sc_fastq: &sc->sc_if.if_snd;
776 sc->sc_if.if_oerrors++;
777 sc->sc_stats.ppp_oerrors++;
793 sc->sc_npqtail = mpp;
797 * Transmitter has finished outputting some stuff;
798 * remember to call sc->sc_start later at splnet.
802 struct ppp_softc *sc;
806 sc->sc_flags &= ~SC_TBUSY;
807 schednetisr(NETISR_PPP);
812 * Get a packet to send. This procedure is intended to be called at
813 * splnet, since it may involve time-consuming operations such as
814 * applying VJ compression, packet compression, address/control and/or
815 * protocol field compression to the packet.
819 struct ppp_softc *sc;
823 int address, control, protocol;
827 * Grab a packet to send: first try the fast queue, then the
830 IF_DEQUEUE(&sc->sc_fastq, m);
832 IF_DEQUEUE(&sc->sc_if.if_snd, m);
836 ++sc->sc_stats.ppp_opackets;
839 * Extract the ppp header of the new packet.
840 * The ppp header will be in one mbuf.
842 cp = mtod(m, u_char *);
843 address = PPP_ADDRESS(cp);
844 control = PPP_CONTROL(cp);
845 protocol = PPP_PROTOCOL(cp);
851 * If the packet is a TCP/IP packet, see if we can compress it.
853 if ((sc->sc_flags & SC_COMP_TCP) && sc->sc_comp != NULL) {
858 ip = (struct ip *) (cp + PPP_HDRLEN);
859 if (mp->m_len <= PPP_HDRLEN) {
863 ip = mtod(mp, struct ip *);
865 /* this code assumes the IP/TCP header is in one non-shared mbuf */
866 if (ip->ip_p == IPPROTO_TCP) {
867 type = sl_compress_tcp(mp, ip, sc->sc_comp,
868 !(sc->sc_flags & SC_NO_TCP_CCID));
870 case TYPE_UNCOMPRESSED_TCP:
871 protocol = PPP_VJC_UNCOMP;
873 case TYPE_COMPRESSED_TCP:
874 protocol = PPP_VJC_COMP;
875 cp = mtod(m, u_char *);
876 cp[0] = address; /* header has moved */
881 cp[3] = protocol; /* update protocol in PPP header */
891 #endif /* PPP_COMPRESS */
895 if (protocol != PPP_LCP && protocol != PPP_CCP
896 && sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) {
897 struct mbuf *mcomp = NULL;
901 for (mp = m; mp != NULL; mp = mp->m_next)
903 clen = (*sc->sc_xcomp->compress)
904 (sc->sc_xc_state, &mcomp, m, slen, sc->sc_if.if_mtu + PPP_HDRLEN);
906 if (sc->sc_flags & SC_CCP_UP) {
907 /* Send the compressed packet instead of the original. */
910 cp = mtod(m, u_char *);
913 /* Can't transmit compressed packets until CCP is up. */
918 #endif /* PPP_COMPRESS */
921 * Compress the address/control and protocol, if possible.
923 if (sc->sc_flags & SC_COMP_AC && address == PPP_ALLSTATIONS &&
924 control == PPP_UI && protocol != PPP_ALLSTATIONS &&
925 protocol != PPP_LCP) {
926 /* can compress address/control */
930 if (sc->sc_flags & SC_COMP_PROT && protocol < 0xFF) {
931 /* can compress protocol */
932 if (mtod(m, u_char *) == cp) {
933 cp[2] = cp[1]; /* move address/control up */
944 * Software interrupt routine, called at splnet.
949 struct ppp_softc *sc;
955 for (i = 0; i < NPPP; ++i, ++sc) {
956 if (!(sc->sc_flags & SC_TBUSY)
957 && (sc->sc_if.if_snd.ifq_head || sc->sc_fastq.ifq_head)) {
959 sc->sc_flags |= SC_TBUSY;
965 IF_DEQUEUE(&sc->sc_rawq, m);
977 * Handle a CCP packet. `rcvd' is 1 if the packet was received,
978 * 0 if it is about to be transmitted.
982 struct ppp_softc *sc;
991 * Get a pointer to the data after the PPP header.
993 if (m->m_len <= PPP_HDRLEN) {
997 dp = (mp != NULL)? mtod(mp, u_char *): NULL;
1000 dp = mtod(mp, u_char *) + PPP_HDRLEN;
1003 ep = mtod(mp, u_char *) + mp->m_len;
1004 if (dp + CCP_HDRLEN > ep)
1006 slen = CCP_LENGTH(dp);
1007 if (dp + slen > ep) {
1008 if (sc->sc_flags & SC_DEBUG)
1009 printf("if_ppp/ccp: not enough data in mbuf (%x+%x > %x+%x)\n",
1010 dp, slen, mtod(mp, u_char *), mp->m_len);
1014 switch (CCP_CODE(dp)) {
1018 /* CCP must be going down - disable compression */
1019 if (sc->sc_flags & SC_CCP_UP) {
1021 sc->sc_flags &= ~(SC_CCP_UP | SC_COMP_RUN | SC_DECOMP_RUN);
1027 if (sc->sc_flags & SC_CCP_OPEN && !(sc->sc_flags & SC_CCP_UP)
1028 && slen >= CCP_HDRLEN + CCP_OPT_MINLEN
1029 && slen >= CCP_OPT_LENGTH(dp + CCP_HDRLEN) + CCP_HDRLEN) {
1031 /* we're agreeing to send compressed packets. */
1032 if (sc->sc_xc_state != NULL
1033 && (*sc->sc_xcomp->comp_init)
1034 (sc->sc_xc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN,
1035 sc->sc_if.if_unit, 0, sc->sc_flags & SC_DEBUG)) {
1037 sc->sc_flags |= SC_COMP_RUN;
1041 /* peer is agreeing to send compressed packets. */
1042 if (sc->sc_rc_state != NULL
1043 && (*sc->sc_rcomp->decomp_init)
1044 (sc->sc_rc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN,
1045 sc->sc_if.if_unit, 0, sc->sc_mru,
1046 sc->sc_flags & SC_DEBUG)) {
1048 sc->sc_flags |= SC_DECOMP_RUN;
1049 sc->sc_flags &= ~(SC_DC_ERROR | SC_DC_FERROR);
1057 if (sc->sc_flags & SC_CCP_UP) {
1059 if (sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN))
1060 (*sc->sc_xcomp->comp_reset)(sc->sc_xc_state);
1062 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) {
1063 (*sc->sc_rcomp->decomp_reset)(sc->sc_rc_state);
1065 sc->sc_flags &= ~SC_DC_ERROR;
1075 * CCP is down; free (de)compressor state if necessary.
1079 struct ppp_softc *sc;
1081 if (sc->sc_xc_state) {
1082 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state);
1083 sc->sc_xc_state = NULL;
1085 if (sc->sc_rc_state) {
1086 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state);
1087 sc->sc_rc_state = NULL;
1090 #endif /* PPP_COMPRESS */
1093 * PPP packet input routine.
1094 * The caller has checked and removed the FCS and has inserted
1095 * the address/control bytes and the protocol high byte if they
1099 ppppktin(sc, m, lost)
1100 struct ppp_softc *sc;
1106 m->m_context = lost;
1107 IF_ENQUEUE(&sc->sc_rawq, m);
1108 schednetisr(NETISR_PPP);
1113 * Process a received PPP packet, doing decompression as necessary.
1114 * Should be called at splnet.
1116 #define COMPTYPE(proto) ((proto) == PPP_VJC_COMP? TYPE_COMPRESSED_TCP: \
1117 TYPE_UNCOMPRESSED_TCP)
1121 struct ppp_softc *sc;
1124 struct ifnet *ifp = &sc->sc_if;
1125 struct ifqueue *inq, *lock;
1126 int s, ilen, xlen, proto, rv;
1127 u_char *cp, adrs, ctrl;
1128 struct mbuf *mp, *dmp = NULL, *pc;
1132 sc->sc_stats.ppp_ipackets++;
1134 if (sc->sc_flags & SC_LOG_INPKT) {
1136 for (mp = m; mp != NULL; mp = mp->m_next)
1138 printf("ppp%d: got %d bytes\n", ifp->if_unit, ilen);
1142 cp = mtod(m, u_char *);
1143 adrs = PPP_ADDRESS(cp);
1144 ctrl = PPP_CONTROL(cp);
1145 proto = PPP_PROTOCOL(cp);
1149 sc->sc_flags |= SC_VJ_RESET;
1155 * Decompress this packet if necessary, update the receiver's
1156 * dictionary, or take appropriate action on a CCP packet.
1158 if (proto == PPP_COMP && sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)
1159 && !(sc->sc_flags & SC_DC_ERROR) && !(sc->sc_flags & SC_DC_FERROR)) {
1160 /* decompress this packet */
1161 rv = (*sc->sc_rcomp->decompress)(sc->sc_rc_state, m, &dmp);
1162 if (rv == DECOMP_OK) {
1165 /* no error, but no decompressed packet produced */
1169 cp = mtod(m, u_char *);
1170 proto = PPP_PROTOCOL(cp);
1174 * An error has occurred in decompression.
1175 * Pass the compressed packet up to pppd, which may take
1176 * CCP down or issue a Reset-Req.
1178 if (sc->sc_flags & SC_DEBUG)
1179 printf("ppp%d: decompress failed %d\n", ifp->if_unit, rv);
1181 sc->sc_flags |= SC_VJ_RESET;
1182 if (rv == DECOMP_ERROR)
1183 sc->sc_flags |= SC_DC_ERROR;
1185 sc->sc_flags |= SC_DC_FERROR;
1190 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) {
1191 (*sc->sc_rcomp->incomp)(sc->sc_rc_state, m);
1193 if (proto == PPP_CCP) {
1200 for (mp = m; mp != NULL; mp = mp->m_next)
1204 if (sc->sc_flags & SC_VJ_RESET) {
1206 * If we've missed a packet, we must toss subsequent compressed
1207 * packets which don't have an explicit connection ID.
1210 sl_uncompress_tcp(NULL, 0, TYPE_ERROR, sc->sc_comp);
1212 sc->sc_flags &= ~SC_VJ_RESET;
1217 * See if we have a VJ-compressed packet to uncompress.
1219 if (proto == PPP_VJC_COMP) {
1220 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0)
1223 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN,
1224 ilen - PPP_HDRLEN, TYPE_COMPRESSED_TCP,
1225 sc->sc_comp, &iphdr, &hlen);
1228 if (sc->sc_flags & SC_DEBUG)
1229 printf("ppp%d: VJ uncompress failed on type comp\n",
1234 /* Copy the PPP and IP headers into a new mbuf. */
1235 MGET(mp, M_DONTWAIT, MT_DATA);
1240 if (hlen + PPP_HDRLEN > MLEN) {
1242 if (M_TRAILINGSPACE(mp) < hlen + PPP_HDRLEN) {
1244 goto bad; /* lose if big headers and no clusters */
1247 cp = mtod(mp, u_char *);
1253 bcopy(iphdr, cp + PPP_HDRLEN, hlen);
1254 mp->m_len = hlen + PPP_HDRLEN;
1257 * Trim the PPP and VJ headers off the old mbuf
1258 * and stick the new and old mbufs together.
1260 m->m_off += PPP_HDRLEN + xlen;
1261 m->m_len -= PPP_HDRLEN + xlen;
1262 if (m->m_len <= M_TRAILINGSPACE(mp)) {
1263 bcopy(mtod(m, u_char *), mtod(mp, u_char *) + mp->m_len, m->m_len);
1264 mp->m_len += m->m_len;
1265 MFREE(m, mp->m_next);
1269 ilen += hlen - xlen;
1271 } else if (proto == PPP_VJC_UNCOMP) {
1272 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0)
1275 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN,
1276 ilen - PPP_HDRLEN, TYPE_UNCOMPRESSED_TCP,
1277 sc->sc_comp, &iphdr, &hlen);
1280 if (sc->sc_flags & SC_DEBUG)
1281 printf("ppp%d: VJ uncompress failed on type uncomp\n",
1292 * If the packet will fit in an ordinary mbuf, don't waste a
1293 * whole cluster on it.
1295 if (ilen <= MLEN && M_IS_CLUSTER(m)) {
1296 MGET(mp, M_DONTWAIT, MT_DATA);
1298 m_copydata(m, mtod(mp, caddr_t), ilen);
1306 * Record the time that we received this packet.
1308 if ((proto & 0x8000) == 0) {
1309 sc->sc_last_recv = time.tv_sec;
1313 /* See if bpf wants to look at the packet. */
1315 bpf_mtap(sc->sc_bpf, m);
1323 * IP packet - take off the ppp header and pass it up to IP.
1325 if ((ifp->if_flags & IFF_UP) == 0
1326 || sc->sc_npmode[NP_IP] != NPMODE_PASS) {
1327 /* interface is down - drop the packet. */
1331 m->m_off += PPP_HDRLEN;
1332 m->m_len -= PPP_HDRLEN;
1333 schednetisr(NETISR_IP);
1340 * Some other protocol - place on input queue for read().
1348 * Put the packet on the appropriate input queue.
1352 smp_lock(&lock->lk_ifqueue, LK_RETRY);
1353 if (IF_QFULL(inq)) {
1355 smp_unlock(&lock->lk_ifqueue);
1357 if (sc->sc_flags & SC_DEBUG)
1358 printf("ppp%d: input queue full\n", ifp->if_unit);
1361 IF_ENQUEUEIF(inq, m, &sc->sc_if);
1362 smp_unlock(&lock->lk_ifqueue);
1373 sc->sc_if.if_ierrors++;
1374 sc->sc_stats.ppp_ierrors++;
1377 #define MAX_DUMP_BYTES 128
1383 char buf[3*MAX_DUMP_BYTES+4];
1386 static char digits[] = "0123456789abcdef";
1388 for (m = m0; m; m = m->m_next) {
1390 u_char *rptr = mtod(m, u_char *);
1393 if (bp > buf + sizeof(buf) - 4)
1395 *bp++ = digits[*rptr >> 4]; /* convert byte to ascii hex */
1396 *bp++ = digits[*rptr++ & 0xf];
1400 if (bp > buf + sizeof(buf) - 3)
1410 printf("%s\n", buf);
1413 #endif /* NPPP > 0 */