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).
72 /* $FreeBSD: src/sys/net/if_ppp.c,v 1.67.2.4 2002/04/14 21:41:48 luigi Exp $ */
73 /* $DragonFly: src/sys/net/ppp/if_ppp.c,v 1.34 2006/12/22 23:44:57 swildner Exp $ */
74 /* from if_sl.c,v 1.11 84/10/04 12:54:47 rick Exp */
75 /* from NetBSD: if_ppp.c,v 1.15.2.2 1994/07/28 05:17:58 cgd Exp */
88 #include <sys/param.h>
89 #include <sys/systm.h>
92 #include <sys/socket.h>
93 #include <sys/filio.h>
94 #include <sys/sockio.h>
95 #include <sys/kernel.h>
97 #include <sys/malloc.h>
99 #include <sys/msgport2.h>
102 #include <net/if_types.h>
103 #include <net/ifq_var.h>
104 #include <net/netisr.h>
108 #include <netinet/in.h>
109 #include <netinet/in_systm.h>
110 #include <netinet/in_var.h>
111 #include <netinet/ip.h>
115 #include <netproto/ipx/ipx.h>
116 #include <netproto/ipx/ipx_if.h>
120 #include <net/slcompress.h>
124 #include "if_pppvar.h"
128 #define splsoftnet splnet
132 #define PACKETPTR struct mbuf *
133 #include <net/ppp_layer/ppp_comp.h>
136 struct ppp_softc ppp_softc[NPPP];
138 /* XXX layering violation */
139 extern void pppasyncattach (void *);
141 static void pppattach (void *);
142 PSEUDO_SET(pppattach, if_ppp);
144 static int pppsioctl (struct ifnet *ifp, u_long cmd, caddr_t data,
147 static void ppp_requeue (struct ppp_softc *);
148 static void ppp_ccp (struct ppp_softc *, struct mbuf *m, int rcvd);
149 static void ppp_ccp_closed (struct ppp_softc *);
150 static void ppp_inproc (struct ppp_softc *, struct mbuf *);
151 static void pppdumpm (struct mbuf *m0);
152 static void ppp_ifstart(struct ifnet *ifp);
155 * Some useful mbuf macros not in mbuf.h.
157 #define M_IS_CLUSTER(m) ((m)->m_flags & M_EXT)
159 #define M_DATASTART(m) \
160 (M_IS_CLUSTER(m) ? (m)->m_ext.ext_buf : \
161 (m)->m_flags & M_PKTHDR ? (m)->m_pktdat : (m)->m_dat)
163 #define M_DATASIZE(m) \
164 (M_IS_CLUSTER(m) ? (m)->m_ext.ext_size : \
165 (m)->m_flags & M_PKTHDR ? MHLEN: MLEN)
168 * We steal two bits in the mbuf m_flags, to mark high-priority packets
169 * for output, and received packets following lost/corrupted packets.
171 #define M_HIGHPRI M_PROTO2 /* output packet for sc_fastq */
172 #define M_ERRMARK M_PROTO3 /* steal a bit in mbuf m_flags */
177 * List of compressors we know about.
178 * We leave some space so maybe we can modload compressors.
181 extern struct compressor ppp_bsd_compress;
182 extern struct compressor ppp_deflate, ppp_deflate_draft;
184 static struct compressor *ppp_compressors[8] = {
185 #if DO_BSD_COMPRESS && defined(PPP_BSDCOMP)
188 #if DO_DEFLATE && defined(PPP_DEFLATE)
194 #endif /* PPP_COMPRESS */
197 * Software interrupt routine, called at spl[soft]net.
200 pppintr(struct netmsg *msg)
203 struct ppp_softc *sc;
207 * Packets are never sent to this netisr so the message must always
208 * be replied. Interlock processing and notification by replying
211 lwkt_replymsg(&msg->nm_lmsg, 0);
214 for (i = 0; i < NPPP; ++i, ++sc) {
215 lwkt_serialize_enter(sc->sc_if.if_serializer);
216 if (!(sc->sc_flags & SC_TBUSY)
217 && (!ifq_is_empty(&sc->sc_if.if_snd) || !IF_QEMPTY(&sc->sc_fastq))) {
218 sc->sc_flags |= SC_TBUSY;
222 IF_DEQUEUE(&sc->sc_rawq, m);
227 lwkt_serialize_exit(sc->sc_if.if_serializer);
233 * Called from boot code to establish ppp interfaces.
236 pppattach(void *dummy)
238 struct ppp_softc *sc;
241 for (sc = ppp_softc; i < NPPP; sc++) {
242 if_initname(&(sc->sc_if), "ppp", i++);
243 sc->sc_if.if_mtu = PPP_MTU;
244 sc->sc_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST;
245 sc->sc_if.if_type = IFT_PPP;
246 sc->sc_if.if_hdrlen = PPP_HDRLEN;
247 sc->sc_if.if_ioctl = pppsioctl;
248 sc->sc_if.if_output = pppoutput;
249 sc->sc_if.if_start = ppp_ifstart;
250 ifq_set_maxlen(&sc->sc_if.if_snd, IFQ_MAXLEN);
251 ifq_set_ready(&sc->sc_if.if_snd);
252 sc->sc_inq.ifq_maxlen = IFQ_MAXLEN;
253 sc->sc_fastq.ifq_maxlen = IFQ_MAXLEN;
254 sc->sc_rawq.ifq_maxlen = IFQ_MAXLEN;
255 callout_init(&sc->sc_timeout);
256 if_attach(&sc->sc_if, NULL);
257 bpfattach(&sc->sc_if, DLT_PPP, PPP_HDRLEN);
259 netisr_register(NETISR_PPP, cpu0_portfn, pppintr);
261 * XXX layering violation - if_ppp can work over any lower level
262 * transport that cares to attach to it.
264 pppasyncattach(dummy);
268 * Allocate a ppp interface unit and initialize it.
271 pppalloc(struct thread *td)
274 struct ppp_softc *sc;
276 for (nppp = 0, sc = ppp_softc; nppp < NPPP; nppp++, sc++)
277 if (sc->sc_xfer == td) {
281 for (nppp = 0, sc = ppp_softc; nppp < NPPP; nppp++, sc++)
282 if (sc->sc_devp == NULL)
288 sc->sc_mru = PPP_MRU;
289 sc->sc_relinq = NULL;
290 bzero((char *)&sc->sc_stats, sizeof(sc->sc_stats));
292 MALLOC(sc->sc_comp, struct slcompress *, sizeof(struct slcompress),
294 sl_compress_init(sc->sc_comp, -1);
297 sc->sc_xc_state = NULL;
298 sc->sc_rc_state = NULL;
299 #endif /* PPP_COMPRESS */
300 for (i = 0; i < NUM_NP; ++i)
301 sc->sc_npmode[i] = NPMODE_ERROR;
302 sc->sc_npqueue = NULL;
303 sc->sc_npqtail = &sc->sc_npqueue;
304 sc->sc_last_sent = sc->sc_last_recv = time_second;
310 * Deallocate a ppp unit. Must be called at splsoftnet or higher.
313 pppdealloc(struct ppp_softc *sc)
318 sc->sc_if.if_flags &= ~(IFF_UP|IFF_RUNNING);
319 getmicrotime(&sc->sc_if.if_lastchange);
323 IF_DEQUEUE(&sc->sc_rawq, m);
329 IF_DEQUEUE(&sc->sc_inq, m);
335 IF_DEQUEUE(&sc->sc_fastq, m);
340 while ((m = sc->sc_npqueue) != NULL) {
341 sc->sc_npqueue = m->m_nextpkt;
346 sc->sc_xc_state = NULL;
347 sc->sc_rc_state = NULL;
348 #endif /* PPP_COMPRESS */
350 if (sc->sc_pass_filt.bf_insns != 0) {
351 kfree(sc->sc_pass_filt.bf_insns, M_DEVBUF);
352 sc->sc_pass_filt.bf_insns = 0;
353 sc->sc_pass_filt.bf_len = 0;
355 if (sc->sc_active_filt.bf_insns != 0) {
356 kfree(sc->sc_active_filt.bf_insns, M_DEVBUF);
357 sc->sc_active_filt.bf_insns = 0;
358 sc->sc_active_filt.bf_len = 0;
360 #endif /* PPP_FILTER */
362 if (sc->sc_comp != 0) {
363 kfree(sc->sc_comp, M_DEVBUF);
370 * Ioctl routine for generic ppp devices.
373 pppioctl(struct ppp_softc *sc, u_long cmd, caddr_t data,
374 int flag, struct ucred *cred)
376 int error, flags, mru, npx;
378 struct ppp_option_data *odp;
379 struct compressor **cp;
383 struct bpf_program *bp, *nbp;
384 struct bpf_insn *newcode, *oldcode;
386 #endif /* PPP_FILTER */
388 u_char ccp_option[CCP_MAX_OPTION_LENGTH];
393 *(int *)data = sc->sc_inq.ifq_len;
397 *(int *)data = sc->sc_if.if_dunit;
401 *(u_int *)data = sc->sc_flags;
405 if ((error = suser_cred(cred, 0)) != 0)
407 flags = *(int *)data & SC_MASK;
410 if (sc->sc_flags & SC_CCP_OPEN && !(flags & SC_CCP_OPEN))
413 sc->sc_flags = (sc->sc_flags & ~SC_MASK) | flags;
418 if ((error = suser_cred(cred, 0)) != 0)
421 if (mru >= PPP_MRU && mru <= PPP_MAXMRU)
426 *(int *)data = sc->sc_mru;
431 if ((error = suser_cred(cred, 0)) != 0)
435 sl_compress_init(sc->sc_comp, *(int *)data);
442 if ((error = suser_cred(cred, 0)) != 0)
444 sc->sc_xfer = curthread;
448 case PPPIOCSCOMPRESS:
449 if ((error = suser_cred(cred, 0)) != 0)
451 odp = (struct ppp_option_data *) data;
453 if (nb > sizeof(ccp_option))
454 nb = sizeof(ccp_option);
455 if ((error = copyin(odp->ptr, ccp_option, nb)) != 0)
457 if (ccp_option[1] < 2) /* preliminary check on the length byte */
459 for (cp = ppp_compressors; *cp != NULL; ++cp)
460 if ((*cp)->compress_proto == ccp_option[0]) {
462 * Found a handler for the protocol - try to allocate
463 * a compressor or decompressor.
468 if (sc->sc_xc_state != NULL)
469 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state);
471 sc->sc_xc_state = (*cp)->comp_alloc(ccp_option, nb);
472 if (sc->sc_xc_state == NULL) {
473 if (sc->sc_flags & SC_DEBUG)
474 kprintf("%s: comp_alloc failed\n",
478 sc->sc_flags &= ~SC_COMP_RUN;
482 if (sc->sc_rc_state != NULL)
483 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state);
485 sc->sc_rc_state = (*cp)->decomp_alloc(ccp_option, nb);
486 if (sc->sc_rc_state == NULL) {
487 if (sc->sc_flags & SC_DEBUG)
488 kprintf("%s: decomp_alloc failed\n",
492 sc->sc_flags &= ~SC_DECOMP_RUN;
497 if (sc->sc_flags & SC_DEBUG)
498 kprintf("%s: no compressor for [%x %x %x], %x\n",
499 sc->sc_if.if_xname, ccp_option[0], ccp_option[1],
501 return (EINVAL); /* no handler found */
502 #endif /* PPP_COMPRESS */
506 npi = (struct npioctl *) data;
507 switch (npi->protocol) {
514 if (cmd == PPPIOCGNPMODE) {
515 npi->mode = sc->sc_npmode[npx];
517 if ((error = suser_cred(cred, 0)) != 0)
519 if (npi->mode != sc->sc_npmode[npx]) {
521 sc->sc_npmode[npx] = npi->mode;
522 if (npi->mode != NPMODE_QUEUE) {
534 ((struct ppp_idle *)data)->xmit_idle = t - sc->sc_last_sent;
535 ((struct ppp_idle *)data)->recv_idle = t - sc->sc_last_recv;
542 nbp = (struct bpf_program *) data;
543 if ((unsigned) nbp->bf_len > BPF_MAXINSNS)
545 newcodelen = nbp->bf_len * sizeof(struct bpf_insn);
546 if (newcodelen != 0) {
547 MALLOC(newcode, struct bpf_insn *, newcodelen, M_DEVBUF, M_WAITOK);
549 return EINVAL; /* or sumpin */
551 if ((error = copyin((caddr_t)nbp->bf_insns, (caddr_t)newcode,
553 kfree(newcode, M_DEVBUF);
556 if (!bpf_validate(newcode, nbp->bf_len)) {
557 kfree(newcode, M_DEVBUF);
562 bp = (cmd == PPPIOCSPASS)? &sc->sc_pass_filt: &sc->sc_active_filt;
563 oldcode = bp->bf_insns;
565 bp->bf_len = nbp->bf_len;
566 bp->bf_insns = newcode;
569 kfree(oldcode, M_DEVBUF);
580 * Process an ioctl request to the ppp network interface.
583 pppsioctl(struct ifnet *ifp, u_long cmd, caddr_t data, struct ucred *cr)
585 struct ppp_softc *sc = &ppp_softc[ifp->if_dunit];
586 struct ifaddr *ifa = (struct ifaddr *)data;
587 struct ifreq *ifr = (struct ifreq *)data;
588 struct ppp_stats *psp;
590 struct ppp_comp_stats *pcp;
598 if ((ifp->if_flags & IFF_RUNNING) == 0)
599 ifp->if_flags &= ~IFF_UP;
604 switch(ifa->ifa_addr->sa_family) {
614 error = EAFNOSUPPORT;
620 switch(ifa->ifa_addr->sa_family) {
630 error = EAFNOSUPPORT;
636 if ((error = suser_cred(cr, 0)) != 0)
638 if (ifr->ifr_mtu > PPP_MAXMTU)
641 sc->sc_if.if_mtu = ifr->ifr_mtu;
643 (*sc->sc_setmtu)(sc);
648 ifr->ifr_mtu = sc->sc_if.if_mtu;
654 error = EAFNOSUPPORT;
657 switch(ifr->ifr_addr.sa_family) {
663 error = EAFNOSUPPORT;
669 psp = &((struct ifpppstatsreq *) data)->stats;
670 bzero(psp, sizeof(*psp));
671 psp->p = sc->sc_stats;
672 #if defined(VJC) && !defined(SL_NO_STATS)
674 psp->vj.vjs_packets = sc->sc_comp->sls_packets;
675 psp->vj.vjs_compressed = sc->sc_comp->sls_compressed;
676 psp->vj.vjs_searches = sc->sc_comp->sls_searches;
677 psp->vj.vjs_misses = sc->sc_comp->sls_misses;
678 psp->vj.vjs_uncompressedin = sc->sc_comp->sls_uncompressedin;
679 psp->vj.vjs_compressedin = sc->sc_comp->sls_compressedin;
680 psp->vj.vjs_errorin = sc->sc_comp->sls_errorin;
681 psp->vj.vjs_tossed = sc->sc_comp->sls_tossed;
688 pcp = &((struct ifpppcstatsreq *) data)->stats;
689 bzero(pcp, sizeof(*pcp));
690 if (sc->sc_xc_state != NULL)
691 (*sc->sc_xcomp->comp_stat)(sc->sc_xc_state, &pcp->c);
692 if (sc->sc_rc_state != NULL)
693 (*sc->sc_rcomp->decomp_stat)(sc->sc_rc_state, &pcp->d);
695 #endif /* PPP_COMPRESS */
705 * Queue a packet. Start transmission if not active.
706 * Packet is placed in Information field of PPP frame.
707 * Called at splnet as the if->if_output handler.
708 * Called at splnet from pppwrite().
711 pppoutput(struct ifnet *ifp, struct mbuf *m0, struct sockaddr *dst,
714 struct ppp_softc *sc = &ppp_softc[ifp->if_dunit];
715 int protocol, address, control;
723 struct altq_pktattr pktattr;
725 if (sc->sc_devp == NULL || (ifp->if_flags & IFF_RUNNING) == 0
726 || ((ifp->if_flags & IFF_UP) == 0 && dst->sa_family != AF_UNSPEC)) {
727 error = ENETDOWN; /* sort of */
731 ifq_classify(&ifp->if_snd, m0, dst->sa_family, &pktattr);
734 * Compute PPP header.
736 m0->m_flags &= ~M_HIGHPRI;
737 switch (dst->sa_family) {
740 address = PPP_ALLSTATIONS;
743 mode = sc->sc_npmode[NP_IP];
746 * If this packet has the "low delay" bit set in the IP header,
747 * put it on the fastq instead.
749 ip = mtod(m0, struct ip *);
750 if (ip->ip_tos & IPTOS_LOWDELAY)
751 m0->m_flags |= M_HIGHPRI;
757 * This is pretty bogus.. We dont have an ipxcp module in pppd
758 * yet to configure the link parameters. Sigh. I guess a
759 * manual ifconfig would do.... -Peter
761 address = PPP_ALLSTATIONS;
768 address = PPP_ADDRESS(dst->sa_data);
769 control = PPP_CONTROL(dst->sa_data);
770 protocol = PPP_PROTOCOL(dst->sa_data);
774 kprintf("%s: af%d not supported\n", ifp->if_xname, dst->sa_family);
775 error = EAFNOSUPPORT;
780 * Drop this packet, or return an error, if necessary.
782 if (mode == NPMODE_ERROR) {
786 if (mode == NPMODE_DROP) {
792 * Add PPP header. If no space in first mbuf, allocate another.
793 * (This assumes M_LEADINGSPACE is always 0 for a cluster mbuf.)
795 if (M_LEADINGSPACE(m0) < PPP_HDRLEN) {
796 m0 = m_prepend(m0, PPP_HDRLEN, MB_DONTWAIT);
803 m0->m_data -= PPP_HDRLEN;
805 cp = mtod(m0, u_char *);
808 *cp++ = protocol >> 8;
809 *cp++ = protocol & 0xff;
810 m0->m_len += PPP_HDRLEN;
813 for (m = m0; m != 0; m = m->m_next)
816 if (sc->sc_flags & SC_LOG_OUTPKT) {
817 kprintf("%s output: ", ifp->if_xname);
821 if ((protocol & 0x8000) == 0) {
824 * Apply the pass and active filters to the packet,
825 * but only if it is a data packet.
827 *mtod(m0, u_char *) = 1; /* indicates outbound */
828 if (sc->sc_pass_filt.bf_insns != 0
829 && bpf_filter(sc->sc_pass_filt.bf_insns, (u_char *) m0,
831 error = 0; /* drop this packet */
836 * Update the time we sent the most recent packet.
838 if (sc->sc_active_filt.bf_insns == 0
839 || bpf_filter(sc->sc_active_filt.bf_insns, (u_char *) m0, len, 0))
840 sc->sc_last_sent = time_second;
842 *mtod(m0, u_char *) = address;
845 * Update the time we sent the most recent data packet.
847 sc->sc_last_sent = time_second;
848 #endif /* PPP_FILTER */
854 * Put the packet on the appropriate queue.
857 if (mode == NPMODE_QUEUE) {
858 /* XXX we should limit the number of packets on this queue */
859 *sc->sc_npqtail = m0;
860 m0->m_nextpkt = NULL;
861 sc->sc_npqtail = &m0->m_nextpkt;
863 /* fastq and if_snd are emptied at spl[soft]net now */
864 if ((m0->m_flags & M_HIGHPRI) && !ifq_is_enabled(&sc->sc_if.if_snd)) {
866 if (IF_QFULL(ifq) && dst->sa_family != AF_UNSPEC) {
875 ASSERT_SERIALIZED(sc->sc_if.if_serializer);
876 error = ifq_enqueue(&sc->sc_if.if_snd, m0, &pktattr);
880 sc->sc_if.if_oerrors++;
881 sc->sc_stats.ppp_oerrors++;
886 getmicrotime(&ifp->if_lastchange);
888 ifp->if_obytes += len;
899 * After a change in the NPmode for some NP, move packets from the
900 * npqueue to the send queue or the fast queue as appropriate.
901 * Should be called at spl[soft]net.
904 ppp_requeue(struct ppp_softc *sc)
906 struct mbuf *m, **mpp;
911 for (mpp = &sc->sc_npqueue; (m = *mpp) != NULL; ) {
912 switch (PPP_PROTOCOL(mtod(m, u_char *))) {
914 mode = sc->sc_npmode[NP_IP];
923 * This packet can now go on one of the queues to be sent.
927 if ((m->m_flags & M_HIGHPRI) && !ifq_is_enabled(&sc->sc_if.if_snd)) {
937 lwkt_serialize_enter(sc->sc_if.if_serializer);
938 error = ifq_enqueue(&sc->sc_if.if_snd, m, NULL);
939 lwkt_serialize_exit(sc->sc_if.if_serializer);
942 sc->sc_if.if_oerrors++;
943 sc->sc_stats.ppp_oerrors++;
958 sc->sc_npqtail = mpp;
962 * Transmitter has finished outputting some stuff;
963 * remember to call sc->sc_start later at splsoftnet.
966 ppp_restart(struct ppp_softc *sc)
969 sc->sc_flags &= ~SC_TBUSY;
970 schednetisr(NETISR_PPP);
976 * Get a packet to send. This procedure is intended to be called at
977 * splsoftnet, since it may involve time-consuming operations such as
978 * applying VJ compression, packet compression, address/control and/or
979 * protocol field compression to the packet.
982 ppp_dequeue(struct ppp_softc *sc)
986 int address, control, protocol;
989 * Grab a packet to send: first try the fast queue, then the
992 IF_DEQUEUE(&sc->sc_fastq, m);
994 m = ifq_dequeue(&sc->sc_if.if_snd, NULL);
998 ++sc->sc_stats.ppp_opackets;
1001 * Extract the ppp header of the new packet.
1002 * The ppp header will be in one mbuf.
1004 cp = mtod(m, u_char *);
1005 address = PPP_ADDRESS(cp);
1006 control = PPP_CONTROL(cp);
1007 protocol = PPP_PROTOCOL(cp);
1013 * If the packet is a TCP/IP packet, see if we can compress it.
1015 if ((sc->sc_flags & SC_COMP_TCP) && sc->sc_comp != NULL) {
1020 ip = (struct ip *) (cp + PPP_HDRLEN);
1021 if (mp->m_len <= PPP_HDRLEN) {
1025 ip = mtod(mp, struct ip *);
1027 /* this code assumes the IP/TCP header is in one non-shared mbuf */
1028 if (ip->ip_p == IPPROTO_TCP) {
1029 type = sl_compress_tcp(mp, ip, sc->sc_comp,
1030 !(sc->sc_flags & SC_NO_TCP_CCID));
1032 case TYPE_UNCOMPRESSED_TCP:
1033 protocol = PPP_VJC_UNCOMP;
1035 case TYPE_COMPRESSED_TCP:
1036 protocol = PPP_VJC_COMP;
1037 cp = mtod(m, u_char *);
1038 cp[0] = address; /* header has moved */
1043 cp[3] = protocol; /* update protocol in PPP header */
1053 #endif /* PPP_COMPRESS */
1057 if (protocol != PPP_LCP && protocol != PPP_CCP
1058 && sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) {
1059 struct mbuf *mcomp = NULL;
1063 for (mp = m; mp != NULL; mp = mp->m_next)
1065 clen = (*sc->sc_xcomp->compress)
1066 (sc->sc_xc_state, &mcomp, m, slen, sc->sc_if.if_mtu + PPP_HDRLEN);
1067 if (mcomp != NULL) {
1068 if (sc->sc_flags & SC_CCP_UP) {
1069 /* Send the compressed packet instead of the original. */
1072 cp = mtod(m, u_char *);
1075 /* Can't transmit compressed packets until CCP is up. */
1080 #endif /* PPP_COMPRESS */
1083 * Compress the address/control and protocol, if possible.
1085 if (sc->sc_flags & SC_COMP_AC && address == PPP_ALLSTATIONS &&
1086 control == PPP_UI && protocol != PPP_ALLSTATIONS &&
1087 protocol != PPP_LCP) {
1088 /* can compress address/control */
1092 if (sc->sc_flags & SC_COMP_PROT && protocol < 0xFF) {
1093 /* can compress protocol */
1094 if (mtod(m, u_char *) == cp) {
1095 cp[2] = cp[1]; /* move address/control up */
1107 * Handle a CCP packet. `rcvd' is 1 if the packet was received,
1108 * 0 if it is about to be transmitted.
1111 ppp_ccp(struct ppp_softc *sc, struct mbuf *m, int rcvd)
1118 * Get a pointer to the data after the PPP header.
1120 if (m->m_len <= PPP_HDRLEN) {
1124 dp = (mp != NULL)? mtod(mp, u_char *): NULL;
1127 dp = mtod(mp, u_char *) + PPP_HDRLEN;
1130 ep = mtod(mp, u_char *) + mp->m_len;
1131 if (dp + CCP_HDRLEN > ep)
1133 slen = CCP_LENGTH(dp);
1134 if (dp + slen > ep) {
1135 if (sc->sc_flags & SC_DEBUG)
1136 kprintf("if_ppp/ccp: not enough data in mbuf (%p+%x > %p+%x)\n",
1137 dp, slen, mtod(mp, u_char *), mp->m_len);
1141 switch (CCP_CODE(dp)) {
1145 /* CCP must be going down - disable compression */
1146 if (sc->sc_flags & SC_CCP_UP) {
1148 sc->sc_flags &= ~(SC_CCP_UP | SC_COMP_RUN | SC_DECOMP_RUN);
1154 if (sc->sc_flags & SC_CCP_OPEN && !(sc->sc_flags & SC_CCP_UP)
1155 && slen >= CCP_HDRLEN + CCP_OPT_MINLEN
1156 && slen >= CCP_OPT_LENGTH(dp + CCP_HDRLEN) + CCP_HDRLEN) {
1158 /* we're agreeing to send compressed packets. */
1159 if (sc->sc_xc_state != NULL
1160 && (*sc->sc_xcomp->comp_init)
1161 (sc->sc_xc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN,
1162 sc->sc_if.if_dunit, 0, sc->sc_flags & SC_DEBUG)) {
1164 sc->sc_flags |= SC_COMP_RUN;
1168 /* peer is agreeing to send compressed packets. */
1169 if (sc->sc_rc_state != NULL
1170 && (*sc->sc_rcomp->decomp_init)
1171 (sc->sc_rc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN,
1172 sc->sc_if.if_dunit, 0, sc->sc_mru,
1173 sc->sc_flags & SC_DEBUG)) {
1175 sc->sc_flags |= SC_DECOMP_RUN;
1176 sc->sc_flags &= ~(SC_DC_ERROR | SC_DC_FERROR);
1184 if (sc->sc_flags & SC_CCP_UP) {
1186 if (sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN))
1187 (*sc->sc_xcomp->comp_reset)(sc->sc_xc_state);
1189 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) {
1190 (*sc->sc_rcomp->decomp_reset)(sc->sc_rc_state);
1192 sc->sc_flags &= ~SC_DC_ERROR;
1202 * CCP is down; free (de)compressor state if necessary.
1205 ppp_ccp_closed(struct ppp_softc *sc)
1207 if (sc->sc_xc_state) {
1208 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state);
1209 sc->sc_xc_state = NULL;
1211 if (sc->sc_rc_state) {
1212 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state);
1213 sc->sc_rc_state = NULL;
1216 #endif /* PPP_COMPRESS */
1219 * PPP packet input routine.
1220 * The caller has checked and removed the FCS and has inserted
1221 * the address/control bytes and the protocol high byte if they
1225 ppppktin(struct ppp_softc *sc, struct mbuf *m, int lost)
1230 m->m_flags |= M_ERRMARK;
1231 IF_ENQUEUE(&sc->sc_rawq, m);
1232 schednetisr(NETISR_PPP);
1238 * Process a received PPP packet, doing decompression as necessary.
1239 * Should be called at splsoftnet.
1241 #define COMPTYPE(proto) ((proto) == PPP_VJC_COMP? TYPE_COMPRESSED_TCP: \
1242 TYPE_UNCOMPRESSED_TCP)
1245 ppp_inproc(struct ppp_softc *sc, struct mbuf *m)
1247 struct ifnet *ifp = &sc->sc_if;
1249 int ilen = 0, xlen, proto, rv;
1250 u_char *cp, adrs, ctrl;
1251 struct mbuf *mp, *dmp = NULL;
1255 ASSERT_SERIALIZED(ifp->if_serializer);
1257 sc->sc_stats.ppp_ipackets++;
1259 if (sc->sc_flags & SC_LOG_INPKT) {
1261 for (mp = m; mp != NULL; mp = mp->m_next)
1263 kprintf("%s: got %d bytes\n", ifp->if_xname, ilen);
1267 cp = mtod(m, u_char *);
1268 adrs = PPP_ADDRESS(cp);
1269 ctrl = PPP_CONTROL(cp);
1270 proto = PPP_PROTOCOL(cp);
1272 if (m->m_flags & M_ERRMARK) {
1273 m->m_flags &= ~M_ERRMARK;
1275 sc->sc_flags |= SC_VJ_RESET;
1281 * Decompress this packet if necessary, update the receiver's
1282 * dictionary, or take appropriate action on a CCP packet.
1284 if (proto == PPP_COMP && sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)
1285 && !(sc->sc_flags & SC_DC_ERROR) && !(sc->sc_flags & SC_DC_FERROR)) {
1286 /* decompress this packet */
1287 rv = (*sc->sc_rcomp->decompress)(sc->sc_rc_state, m, &dmp);
1288 if (rv == DECOMP_OK) {
1291 /* no error, but no decompressed packet produced */
1295 cp = mtod(m, u_char *);
1296 proto = PPP_PROTOCOL(cp);
1300 * An error has occurred in decompression.
1301 * Pass the compressed packet up to pppd, which may take
1302 * CCP down or issue a Reset-Req.
1304 if (sc->sc_flags & SC_DEBUG)
1305 kprintf("%s: decompress failed %d\n", ifp->if_xname, rv);
1307 sc->sc_flags |= SC_VJ_RESET;
1308 if (rv == DECOMP_ERROR)
1309 sc->sc_flags |= SC_DC_ERROR;
1311 sc->sc_flags |= SC_DC_FERROR;
1316 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) {
1317 (*sc->sc_rcomp->incomp)(sc->sc_rc_state, m);
1319 if (proto == PPP_CCP) {
1326 for (mp = m; mp != NULL; mp = mp->m_next)
1330 if (sc->sc_flags & SC_VJ_RESET) {
1332 * If we've missed a packet, we must toss subsequent compressed
1333 * packets which don't have an explicit connection ID.
1336 sl_uncompress_tcp(NULL, 0, TYPE_ERROR, sc->sc_comp);
1338 sc->sc_flags &= ~SC_VJ_RESET;
1343 * See if we have a VJ-compressed packet to uncompress.
1345 if (proto == PPP_VJC_COMP) {
1346 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0)
1349 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN,
1350 ilen - PPP_HDRLEN, TYPE_COMPRESSED_TCP,
1351 sc->sc_comp, &iphdr, &hlen);
1354 if (sc->sc_flags & SC_DEBUG)
1355 kprintf("%s: VJ uncompress failed on type comp\n",
1360 /* Copy the PPP and IP headers into a new mbuf. */
1361 MGETHDR(mp, MB_DONTWAIT, MT_DATA);
1366 if (hlen + PPP_HDRLEN > MHLEN) {
1367 MCLGET(mp, MB_DONTWAIT);
1368 if (M_TRAILINGSPACE(mp) < hlen + PPP_HDRLEN) {
1370 goto bad; /* lose if big headers and no clusters */
1373 cp = mtod(mp, u_char *);
1379 bcopy(iphdr, cp + PPP_HDRLEN, hlen);
1380 mp->m_len = hlen + PPP_HDRLEN;
1383 * Trim the PPP and VJ headers off the old mbuf
1384 * and stick the new and old mbufs together.
1386 m->m_data += PPP_HDRLEN + xlen;
1387 m->m_len -= PPP_HDRLEN + xlen;
1388 if (m->m_len <= M_TRAILINGSPACE(mp)) {
1389 bcopy(mtod(m, u_char *), mtod(mp, u_char *) + mp->m_len, m->m_len);
1390 mp->m_len += m->m_len;
1391 mp->m_next = m_free(m);
1396 ilen += hlen - xlen;
1398 } else if (proto == PPP_VJC_UNCOMP) {
1399 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0)
1402 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN,
1403 ilen - PPP_HDRLEN, TYPE_UNCOMPRESSED_TCP,
1404 sc->sc_comp, &iphdr, &hlen);
1407 if (sc->sc_flags & SC_DEBUG)
1408 kprintf("%s: VJ uncompress failed on type uncomp\n",
1419 * If the packet will fit in a header mbuf, don't waste a
1420 * whole cluster on it.
1422 if (ilen <= MHLEN && M_IS_CLUSTER(m)) {
1423 MGETHDR(mp, MB_DONTWAIT, MT_DATA);
1425 m_copydata(m, 0, ilen, mtod(mp, caddr_t));
1431 m->m_pkthdr.len = ilen;
1432 m->m_pkthdr.rcvif = ifp;
1434 if ((proto & 0x8000) == 0) {
1437 * See whether we want to pass this packet, and
1438 * if it counts as link activity.
1440 adrs = *mtod(m, u_char *); /* save address field */
1441 *mtod(m, u_char *) = 0; /* indicate inbound */
1442 if (sc->sc_pass_filt.bf_insns != 0
1443 && bpf_filter(sc->sc_pass_filt.bf_insns, (u_char *) m,
1445 /* drop this packet */
1449 if (sc->sc_active_filt.bf_insns == 0
1450 || bpf_filter(sc->sc_active_filt.bf_insns, (u_char *) m, ilen, 0))
1451 sc->sc_last_recv = time_second;
1453 *mtod(m, u_char *) = adrs;
1456 * Record the time that we received this packet.
1458 sc->sc_last_recv = time_second;
1459 #endif /* PPP_FILTER */
1462 BPF_MTAP(&sc->sc_if, m);
1469 * IP packet - take off the ppp header and pass it up to IP.
1471 if ((ifp->if_flags & IFF_UP) == 0
1472 || sc->sc_npmode[NP_IP] != NPMODE_PASS) {
1473 /* interface is down - drop the packet. */
1477 m->m_pkthdr.len -= PPP_HDRLEN;
1478 m->m_data += PPP_HDRLEN;
1479 m->m_len -= PPP_HDRLEN;
1480 if (ipflow_fastforward(m, ifp->if_serializer))
1488 * IPX packet - take off the ppp header and pass it up to IPX.
1490 if ((sc->sc_if.if_flags & IFF_UP) == 0
1491 /* XXX: || sc->sc_npmode[NP_IPX] != NPMODE_PASS*/) {
1492 /* interface is down - drop the packet. */
1496 m->m_pkthdr.len -= PPP_HDRLEN;
1497 m->m_data += PPP_HDRLEN;
1498 m->m_len -= PPP_HDRLEN;
1500 sc->sc_last_recv = time_second; /* update time of last pkt rcvd */
1506 * Some other protocol - place on input queue for read().
1512 * If we found a netproto just pass it to the proto. Otherwise queue
1513 * the packet to the tty (e.g. pppd). Note that sc_ctlp() must be
1514 * called EXACTLY once per packet queued.
1517 rv = IF_HANDOFF(&sc->sc_inq, m, NULL);
1521 rv = (netisr_queue(isr, m) == 0);
1524 if (sc->sc_flags & SC_DEBUG)
1525 kprintf("%s: input queue full\n", ifp->if_xname);
1531 ifp->if_ibytes += ilen;
1532 getmicrotime(&ifp->if_lastchange);
1538 sc->sc_if.if_ierrors++;
1539 sc->sc_stats.ppp_ierrors++;
1542 #define MAX_DUMP_BYTES 128
1545 pppdumpm(struct mbuf *m0)
1547 char buf[3*MAX_DUMP_BYTES+4];
1551 for (m = m0; m; m = m->m_next) {
1553 u_char *rptr = (u_char *)m->m_data;
1556 if (bp > buf + sizeof(buf) - 4)
1558 *bp++ = hex2ascii(*rptr >> 4);
1559 *bp++ = hex2ascii(*rptr++ & 0xf);
1563 if (bp > buf + sizeof(buf) - 3)
1573 kprintf("%s\n", buf);
1577 * a wrapper to transmit a packet from if_start since ALTQ uses
1578 * if_start to send a packet.
1581 ppp_ifstart(struct ifnet *ifp)
1583 struct ppp_softc *sc;
1586 (*sc->sc_start)(sc);