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 /* from if_sl.c,v 1.11 84/10/04 12:54:47 rick Exp */
74 /* from NetBSD: if_ppp.c,v 1.15.2.2 1994/07/28 05:17:58 cgd Exp */
87 #include <sys/param.h>
88 #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>
100 #include <sys/mplock2.h>
103 #include <net/if_types.h>
104 #include <net/ifq_var.h>
105 #include <net/netisr.h>
109 #include <netinet/in.h>
110 #include <netinet/in_systm.h>
111 #include <netinet/in_var.h>
112 #include <netinet/ip.h>
116 #include <netproto/ipx/ipx.h>
117 #include <netproto/ipx/ipx_if.h>
121 #include <net/slcompress.h>
125 #include "if_pppvar.h"
129 #define splsoftnet splnet
133 #define PACKETPTR struct mbuf *
134 #include <net/ppp_layer/ppp_comp.h>
137 struct ppp_softc ppp_softc[NPPP];
139 /* XXX layering violation */
140 extern void pppasyncattach (void *);
142 static void pppattach (void *);
143 PSEUDO_SET(pppattach, if_ppp);
145 static int pppsioctl (struct ifnet *ifp, u_long cmd, caddr_t data,
148 static void ppp_requeue (struct ppp_softc *);
149 static void ppp_ccp (struct ppp_softc *, struct mbuf *m, int rcvd);
150 static void ppp_ccp_closed (struct ppp_softc *);
151 static void ppp_inproc (struct ppp_softc *, struct mbuf *);
152 static void pppdumpm (struct mbuf *m0);
153 static void ppp_ifstart(struct ifnet *ifp, struct ifaltq_subque *ifsq);
156 * Some useful mbuf macros not in mbuf.h.
158 #define M_IS_CLUSTER(m) ((m)->m_flags & M_EXT)
160 #define M_DATASTART(m) \
161 (M_IS_CLUSTER(m) ? (m)->m_ext.ext_buf : \
162 (m)->m_flags & M_PKTHDR ? (m)->m_pktdat : (m)->m_dat)
164 #define M_DATASIZE(m) \
165 (M_IS_CLUSTER(m) ? (m)->m_ext.ext_size : \
166 (m)->m_flags & M_PKTHDR ? MHLEN: MLEN)
169 * We steal two bits in the mbuf m_flags, to mark high-priority packets
170 * for output, and received packets following lost/corrupted packets.
172 #define M_HIGHPRI M_PROTO2 /* output packet for sc_fastq */
173 #define M_ERRMARK M_PROTO3 /* steal a bit in mbuf m_flags */
178 * List of compressors we know about.
179 * We leave some space so maybe we can modload compressors.
182 extern struct compressor ppp_bsd_compress;
183 extern struct compressor ppp_deflate, ppp_deflate_draft;
185 static struct compressor *ppp_compressors[8] = {
186 #if DO_BSD_COMPRESS && defined(PPP_BSDCOMP)
189 #if DO_DEFLATE && defined(PPP_DEFLATE)
195 #endif /* PPP_COMPRESS */
198 * Software interrupt routine, called at spl[soft]net.
201 pppintr(netmsg_t msg)
204 struct ppp_softc *sc;
205 struct ifaltq_subque *ifsq;
209 * Packets are never sent to this netisr so the message must always
210 * be replied. Interlock processing and notification by replying
213 lwkt_replymsg(&msg->lmsg, 0);
218 ifsq = ifq_get_subq_default(&sc->sc_if.if_snd);
220 for (i = 0; i < NPPP; ++i, ++sc) {
221 ifnet_serialize_all(&sc->sc_if);
222 if (!(sc->sc_flags & SC_TBUSY)
223 && (!ifsq_is_empty(ifsq) || !IF_QEMPTY(&sc->sc_fastq))) {
224 sc->sc_flags |= SC_TBUSY;
228 IF_DEQUEUE(&sc->sc_rawq, m);
233 ifnet_deserialize_all(&sc->sc_if);
239 * Called from boot code to establish ppp interfaces.
242 pppattach(void *dummy)
244 struct ppp_softc *sc;
247 for (sc = ppp_softc; i < NPPP; sc++) {
248 if_initname(&(sc->sc_if), "ppp", i++);
249 sc->sc_if.if_softc = sc;
250 sc->sc_if.if_mtu = PPP_MTU;
251 sc->sc_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST;
252 sc->sc_if.if_type = IFT_PPP;
253 sc->sc_if.if_hdrlen = PPP_HDRLEN;
254 sc->sc_if.if_ioctl = pppsioctl;
255 sc->sc_if.if_output = pppoutput;
256 sc->sc_if.if_start = ppp_ifstart;
257 ifq_set_maxlen(&sc->sc_if.if_snd, IFQ_MAXLEN);
258 ifq_set_ready(&sc->sc_if.if_snd);
259 sc->sc_inq.ifq_maxlen = IFQ_MAXLEN;
260 sc->sc_fastq.ifq_maxlen = IFQ_MAXLEN;
261 sc->sc_rawq.ifq_maxlen = IFQ_MAXLEN;
262 callout_init(&sc->sc_timeout);
263 if_attach(&sc->sc_if, NULL);
264 bpfattach(&sc->sc_if, DLT_PPP, PPP_HDRLEN);
266 netisr_register(NETISR_PPP, pppintr, NULL);
268 * XXX layering violation - if_ppp can work over any lower level
269 * transport that cares to attach to it.
271 pppasyncattach(dummy);
275 * Allocate a ppp interface unit and initialize it.
278 pppalloc(struct thread *td)
281 struct ppp_softc *sc;
283 for (nppp = 0, sc = ppp_softc; nppp < NPPP; nppp++, sc++)
284 if (sc->sc_xfer == td) {
288 for (nppp = 0, sc = ppp_softc; nppp < NPPP; nppp++, sc++)
289 if (sc->sc_devp == NULL)
295 sc->sc_mru = PPP_MRU;
296 sc->sc_relinq = NULL;
297 bzero((char *)&sc->sc_stats, sizeof(sc->sc_stats));
299 sc->sc_comp = kmalloc(sizeof(struct slcompress), M_DEVBUF, M_WAITOK);
300 sl_compress_init(sc->sc_comp, -1);
303 sc->sc_xc_state = NULL;
304 sc->sc_rc_state = NULL;
305 #endif /* PPP_COMPRESS */
306 for (i = 0; i < NUM_NP; ++i)
307 sc->sc_npmode[i] = NPMODE_ERROR;
308 sc->sc_npqueue = NULL;
309 sc->sc_npqtail = &sc->sc_npqueue;
310 sc->sc_last_sent = sc->sc_last_recv = time_second;
316 * Deallocate a ppp unit. Must be called at splsoftnet or higher.
319 pppdealloc(struct ppp_softc *sc)
324 sc->sc_if.if_flags &= ~(IFF_UP|IFF_RUNNING);
325 getmicrotime(&sc->sc_if.if_lastchange);
329 IF_DEQUEUE(&sc->sc_rawq, m);
335 IF_DEQUEUE(&sc->sc_inq, m);
341 IF_DEQUEUE(&sc->sc_fastq, m);
346 while ((m = sc->sc_npqueue) != NULL) {
347 sc->sc_npqueue = m->m_nextpkt;
352 sc->sc_xc_state = NULL;
353 sc->sc_rc_state = NULL;
354 #endif /* PPP_COMPRESS */
356 if (sc->sc_pass_filt.bf_insns != NULL) {
357 kfree(sc->sc_pass_filt.bf_insns, M_DEVBUF);
358 sc->sc_pass_filt.bf_insns = NULL;
359 sc->sc_pass_filt.bf_len = 0;
361 if (sc->sc_active_filt.bf_insns != NULL) {
362 kfree(sc->sc_active_filt.bf_insns, M_DEVBUF);
363 sc->sc_active_filt.bf_insns = NULL;
364 sc->sc_active_filt.bf_len = 0;
366 #endif /* PPP_FILTER */
368 if (sc->sc_comp != NULL) {
369 kfree(sc->sc_comp, M_DEVBUF);
376 * Ioctl routine for generic ppp devices.
379 pppioctl(struct ppp_softc *sc, u_long cmd, caddr_t data,
380 int flag, struct ucred *cred)
382 int error, flags, mru, npx;
384 struct ppp_option_data *odp;
385 struct compressor **cp;
389 struct bpf_program *bp, *nbp;
390 struct bpf_insn *newcode, *oldcode;
392 #endif /* PPP_FILTER */
394 u_char ccp_option[CCP_MAX_OPTION_LENGTH];
399 *(int *)data = sc->sc_inq.ifq_len;
403 *(int *)data = sc->sc_if.if_dunit;
407 *(u_int *)data = sc->sc_flags;
411 if ((error = priv_check_cred(cred, PRIV_ROOT, 0)) != 0)
413 flags = *(int *)data & SC_MASK;
416 if (sc->sc_flags & SC_CCP_OPEN && !(flags & SC_CCP_OPEN))
419 sc->sc_flags = (sc->sc_flags & ~SC_MASK) | flags;
424 if ((error = priv_check_cred(cred, PRIV_ROOT, 0)) != 0)
427 if (mru >= PPP_MRU && mru <= PPP_MAXMRU)
432 *(int *)data = sc->sc_mru;
437 if ((error = priv_check_cred(cred, PRIV_ROOT, 0)) != 0)
441 sl_compress_init(sc->sc_comp, *(int *)data);
448 if ((error = priv_check_cred(cred, PRIV_ROOT, 0)) != 0)
450 sc->sc_xfer = curthread;
454 case PPPIOCSCOMPRESS:
455 if ((error = priv_check_cred(cred, PRIV_ROOT, 0)) != 0)
457 odp = (struct ppp_option_data *) data;
459 if (nb > sizeof(ccp_option))
460 nb = sizeof(ccp_option);
461 if ((error = copyin(odp->ptr, ccp_option, nb)) != 0)
463 if (ccp_option[1] < 2) /* preliminary check on the length byte */
465 for (cp = ppp_compressors; *cp != NULL; ++cp)
466 if ((*cp)->compress_proto == ccp_option[0]) {
468 * Found a handler for the protocol - try to allocate
469 * a compressor or decompressor.
474 if (sc->sc_xc_state != NULL)
475 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state);
477 sc->sc_xc_state = (*cp)->comp_alloc(ccp_option, nb);
478 if (sc->sc_xc_state == NULL) {
479 if (sc->sc_flags & SC_DEBUG)
480 kprintf("%s: comp_alloc failed\n",
484 sc->sc_flags &= ~SC_COMP_RUN;
488 if (sc->sc_rc_state != NULL)
489 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state);
491 sc->sc_rc_state = (*cp)->decomp_alloc(ccp_option, nb);
492 if (sc->sc_rc_state == NULL) {
493 if (sc->sc_flags & SC_DEBUG)
494 kprintf("%s: decomp_alloc failed\n",
498 sc->sc_flags &= ~SC_DECOMP_RUN;
503 if (sc->sc_flags & SC_DEBUG)
504 kprintf("%s: no compressor for [%x %x %x], %x\n",
505 sc->sc_if.if_xname, ccp_option[0], ccp_option[1],
507 return (EINVAL); /* no handler found */
508 #endif /* PPP_COMPRESS */
512 npi = (struct npioctl *) data;
513 switch (npi->protocol) {
520 if (cmd == PPPIOCGNPMODE) {
521 npi->mode = sc->sc_npmode[npx];
523 if ((error = priv_check_cred(cred, PRIV_ROOT, 0)) != 0)
525 if (npi->mode != sc->sc_npmode[npx]) {
527 sc->sc_npmode[npx] = npi->mode;
528 if (npi->mode != NPMODE_QUEUE) {
540 ((struct ppp_idle *)data)->xmit_idle = t - sc->sc_last_sent;
541 ((struct ppp_idle *)data)->recv_idle = t - sc->sc_last_recv;
548 nbp = (struct bpf_program *) data;
549 if ((unsigned) nbp->bf_len > BPF_MAXINSNS)
551 newcodelen = nbp->bf_len * sizeof(struct bpf_insn);
552 if (newcodelen != 0) {
553 newcode = kmalloc(newcodelen, M_DEVBUF, M_WAITOK);
554 if ((error = copyin((caddr_t)nbp->bf_insns, (caddr_t)newcode,
556 kfree(newcode, M_DEVBUF);
559 if (!bpf_validate(newcode, nbp->bf_len)) {
560 kfree(newcode, M_DEVBUF);
565 bp = (cmd == PPPIOCSPASS)? &sc->sc_pass_filt: &sc->sc_active_filt;
566 oldcode = bp->bf_insns;
568 bp->bf_len = nbp->bf_len;
569 bp->bf_insns = newcode;
572 kfree(oldcode, M_DEVBUF);
583 * Process an ioctl request to the ppp network interface.
586 pppsioctl(struct ifnet *ifp, u_long cmd, caddr_t data, struct ucred *cr)
588 struct ppp_softc *sc = &ppp_softc[ifp->if_dunit];
589 struct ifaddr *ifa = (struct ifaddr *)data;
590 struct ifreq *ifr = (struct ifreq *)data;
591 struct ppp_stats *psp;
593 struct ppp_comp_stats *pcp;
601 if ((ifp->if_flags & IFF_RUNNING) == 0)
602 ifp->if_flags &= ~IFF_UP;
607 switch(ifa->ifa_addr->sa_family) {
617 error = EAFNOSUPPORT;
623 switch(ifa->ifa_addr->sa_family) {
633 error = EAFNOSUPPORT;
639 if ((error = priv_check_cred(cr, PRIV_ROOT, 0)) != 0)
641 if (ifr->ifr_mtu > PPP_MAXMTU)
644 sc->sc_if.if_mtu = ifr->ifr_mtu;
646 (*sc->sc_setmtu)(sc);
651 ifr->ifr_mtu = sc->sc_if.if_mtu;
657 error = EAFNOSUPPORT;
660 switch(ifr->ifr_addr.sa_family) {
666 error = EAFNOSUPPORT;
672 psp = &((struct ifpppstatsreq *) data)->stats;
673 bzero(psp, sizeof(*psp));
674 psp->p = sc->sc_stats;
675 #if defined(VJC) && !defined(SL_NO_STATS)
677 psp->vj.vjs_packets = sc->sc_comp->sls_packets;
678 psp->vj.vjs_compressed = sc->sc_comp->sls_compressed;
679 psp->vj.vjs_searches = sc->sc_comp->sls_searches;
680 psp->vj.vjs_misses = sc->sc_comp->sls_misses;
681 psp->vj.vjs_uncompressedin = sc->sc_comp->sls_uncompressedin;
682 psp->vj.vjs_compressedin = sc->sc_comp->sls_compressedin;
683 psp->vj.vjs_errorin = sc->sc_comp->sls_errorin;
684 psp->vj.vjs_tossed = sc->sc_comp->sls_tossed;
691 pcp = &((struct ifpppcstatsreq *) data)->stats;
692 bzero(pcp, sizeof(*pcp));
693 if (sc->sc_xc_state != NULL)
694 (*sc->sc_xcomp->comp_stat)(sc->sc_xc_state, &pcp->c);
695 if (sc->sc_rc_state != NULL)
696 (*sc->sc_rcomp->decomp_stat)(sc->sc_rc_state, &pcp->d);
698 #endif /* PPP_COMPRESS */
708 * Queue a packet. Start transmission if not active.
709 * Packet is placed in Information field of PPP frame.
710 * Called at splnet as the if->if_output handler.
711 * Called at splnet from pppwrite().
714 pppoutput_serialized(struct ifnet *ifp, struct ifaltq_subque *ifsq,
715 struct mbuf *m0, struct sockaddr *dst, struct rtentry *rtp)
717 struct ppp_softc *sc = &ppp_softc[ifp->if_dunit];
718 int protocol, address, control;
728 struct altq_pktattr pktattr;
730 if (sc->sc_devp == NULL || (ifp->if_flags & IFF_RUNNING) == 0
731 || ((ifp->if_flags & IFF_UP) == 0 && dst->sa_family != AF_UNSPEC)) {
732 error = ENETDOWN; /* sort of */
736 ifq_classify(&ifp->if_snd, m0, dst->sa_family, &pktattr);
739 * Compute PPP header.
741 m0->m_flags &= ~M_HIGHPRI;
742 switch (dst->sa_family) {
745 address = PPP_ALLSTATIONS;
748 mode = sc->sc_npmode[NP_IP];
751 * If this packet has the "low delay" bit set in the IP header,
752 * put it on the fastq instead.
754 ip = mtod(m0, struct ip *);
755 if (ip->ip_tos & IPTOS_LOWDELAY)
756 m0->m_flags |= M_HIGHPRI;
762 * This is pretty bogus.. We dont have an ipxcp module in pppd
763 * yet to configure the link parameters. Sigh. I guess a
764 * manual ifconfig would do.... -Peter
766 address = PPP_ALLSTATIONS;
773 address = PPP_ADDRESS(dst->sa_data);
774 control = PPP_CONTROL(dst->sa_data);
775 protocol = PPP_PROTOCOL(dst->sa_data);
779 kprintf("%s: af%d not supported\n", ifp->if_xname, dst->sa_family);
780 error = EAFNOSUPPORT;
785 * Drop this packet, or return an error, if necessary.
787 if (mode == NPMODE_ERROR) {
791 if (mode == NPMODE_DROP) {
797 * Add PPP header. If no space in first mbuf, allocate another.
798 * (This assumes M_LEADINGSPACE is always 0 for a cluster mbuf.)
800 if (M_LEADINGSPACE(m0) < PPP_HDRLEN) {
801 m0 = m_prepend(m0, PPP_HDRLEN, MB_DONTWAIT);
808 m0->m_data -= PPP_HDRLEN;
810 cp = mtod(m0, u_char *);
813 *cp++ = protocol >> 8;
814 *cp++ = protocol & 0xff;
815 m0->m_len += PPP_HDRLEN;
818 for (m = m0; m != NULL; m = m->m_next)
821 if (sc->sc_flags & SC_LOG_OUTPKT) {
822 kprintf("%s output: ", ifp->if_xname);
826 if ((protocol & 0x8000) == 0) {
829 * Apply the pass and active filters to the packet,
830 * but only if it is a data packet.
832 *mtod(m0, u_char *) = 1; /* indicates outbound */
833 if (sc->sc_pass_filt.bf_insns != NULL
834 && bpf_filter(sc->sc_pass_filt.bf_insns, (u_char *) m0,
836 error = 0; /* drop this packet */
841 * Update the time we sent the most recent packet.
843 if (sc->sc_active_filt.bf_insns == NULL
844 || bpf_filter(sc->sc_active_filt.bf_insns, (u_char *) m0, len, 0))
845 sc->sc_last_sent = time_second;
847 *mtod(m0, u_char *) = address;
850 * Update the time we sent the most recent data packet.
852 sc->sc_last_sent = time_second;
853 #endif /* PPP_FILTER */
859 * Put the packet on the appropriate queue.
862 if (mode == NPMODE_QUEUE) {
863 /* XXX we should limit the number of packets on this queue */
864 *sc->sc_npqtail = m0;
865 m0->m_nextpkt = NULL;
866 sc->sc_npqtail = &m0->m_nextpkt;
868 /* fastq and if_snd are emptied at spl[soft]net now */
869 if ((m0->m_flags & M_HIGHPRI) && !ifq_is_enabled(&sc->sc_if.if_snd)) {
871 if (IF_QFULL(ifq) && dst->sa_family != AF_UNSPEC) {
880 ASSERT_IFNET_SERIALIZED_TX(&sc->sc_if, ifsq);
881 error = ifsq_enqueue(ifsq, m0, &pktattr);
885 sc->sc_if.if_oerrors++;
886 sc->sc_stats.ppp_oerrors++;
891 getmicrotime(&ifp->if_lastchange);
893 ifp->if_obytes += len;
904 pppoutput(struct ifnet *ifp, struct mbuf *m0, struct sockaddr *dst,
907 struct ifaltq_subque *ifsq = ifq_get_subq_default(&ifp->if_snd);
910 ifnet_serialize_tx(ifp, ifsq);
911 error = pppoutput_serialized(ifp, ifsq, m0, dst, rtp);
912 ifnet_deserialize_tx(ifp, ifsq);
918 * After a change in the NPmode for some NP, move packets from the
919 * npqueue to the send queue or the fast queue as appropriate.
920 * Should be called at spl[soft]net.
923 ppp_requeue(struct ppp_softc *sc)
925 struct mbuf *m, **mpp;
927 struct ifaltq_subque *ifsq;
931 ifsq = ifq_get_subq_default(&sc->sc_if.if_snd);
932 for (mpp = &sc->sc_npqueue; (m = *mpp) != NULL; ) {
933 switch (PPP_PROTOCOL(mtod(m, u_char *))) {
935 mode = sc->sc_npmode[NP_IP];
944 * This packet can now go on one of the queues to be sent.
948 if ((m->m_flags & M_HIGHPRI) && !ifq_is_enabled(&sc->sc_if.if_snd)) {
958 error = ifsq_enqueue(ifsq, m, NULL);
961 sc->sc_if.if_oerrors++;
962 sc->sc_stats.ppp_oerrors++;
977 sc->sc_npqtail = mpp;
981 * Transmitter has finished outputting some stuff;
982 * remember to call sc->sc_start later at splsoftnet.
985 ppp_restart(struct ppp_softc *sc)
988 sc->sc_flags &= ~SC_TBUSY;
989 schednetisr(NETISR_PPP);
995 * Get a packet to send. This procedure is intended to be called at
996 * splsoftnet, since it may involve time-consuming operations such as
997 * applying VJ compression, packet compression, address/control and/or
998 * protocol field compression to the packet.
1001 ppp_dequeue(struct ppp_softc *sc)
1003 struct mbuf *m, *mp;
1005 int address, control, protocol;
1008 * Grab a packet to send: first try the fast queue, then the
1011 IF_DEQUEUE(&sc->sc_fastq, m);
1013 m = ifsq_dequeue(ifq_get_subq_default(&sc->sc_if.if_snd), NULL);
1017 ++sc->sc_stats.ppp_opackets;
1020 * Extract the ppp header of the new packet.
1021 * The ppp header will be in one mbuf.
1023 cp = mtod(m, u_char *);
1024 address = PPP_ADDRESS(cp);
1025 control = PPP_CONTROL(cp);
1026 protocol = PPP_PROTOCOL(cp);
1032 * If the packet is a TCP/IP packet, see if we can compress it.
1034 if ((sc->sc_flags & SC_COMP_TCP) && sc->sc_comp != NULL) {
1039 ip = (struct ip *) (cp + PPP_HDRLEN);
1040 if (mp->m_len <= PPP_HDRLEN) {
1044 ip = mtod(mp, struct ip *);
1046 /* this code assumes the IP/TCP header is in one non-shared mbuf */
1047 if (ip->ip_p == IPPROTO_TCP) {
1048 type = sl_compress_tcp(mp, ip, sc->sc_comp,
1049 !(sc->sc_flags & SC_NO_TCP_CCID));
1051 case TYPE_UNCOMPRESSED_TCP:
1052 protocol = PPP_VJC_UNCOMP;
1054 case TYPE_COMPRESSED_TCP:
1055 protocol = PPP_VJC_COMP;
1056 cp = mtod(m, u_char *);
1057 cp[0] = address; /* header has moved */
1062 cp[3] = protocol; /* update protocol in PPP header */
1072 #endif /* PPP_COMPRESS */
1076 if (protocol != PPP_LCP && protocol != PPP_CCP
1077 && sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) {
1078 struct mbuf *mcomp = NULL;
1082 for (mp = m; mp != NULL; mp = mp->m_next)
1084 (*sc->sc_xcomp->compress)
1085 (sc->sc_xc_state, &mcomp, m, slen, sc->sc_if.if_mtu + PPP_HDRLEN);
1086 if (mcomp != NULL) {
1087 if (sc->sc_flags & SC_CCP_UP) {
1088 /* Send the compressed packet instead of the original. */
1091 cp = mtod(m, u_char *);
1094 /* Can't transmit compressed packets until CCP is up. */
1099 #endif /* PPP_COMPRESS */
1102 * Compress the address/control and protocol, if possible.
1104 if (sc->sc_flags & SC_COMP_AC && address == PPP_ALLSTATIONS &&
1105 control == PPP_UI && protocol != PPP_ALLSTATIONS &&
1106 protocol != PPP_LCP) {
1107 /* can compress address/control */
1111 if (sc->sc_flags & SC_COMP_PROT && protocol < 0xFF) {
1112 /* can compress protocol */
1113 if (mtod(m, u_char *) == cp) {
1114 cp[2] = cp[1]; /* move address/control up */
1126 * Handle a CCP packet. `rcvd' is 1 if the packet was received,
1127 * 0 if it is about to be transmitted.
1130 ppp_ccp(struct ppp_softc *sc, struct mbuf *m, int rcvd)
1137 * Get a pointer to the data after the PPP header.
1139 if (m->m_len <= PPP_HDRLEN) {
1143 dp = (mp != NULL)? mtod(mp, u_char *): NULL;
1146 dp = mtod(mp, u_char *) + PPP_HDRLEN;
1149 ep = mtod(mp, u_char *) + mp->m_len;
1150 if (dp + CCP_HDRLEN > ep)
1152 slen = CCP_LENGTH(dp);
1153 if (dp + slen > ep) {
1154 if (sc->sc_flags & SC_DEBUG)
1155 kprintf("if_ppp/ccp: not enough data in mbuf (%p+%x > %p+%x)\n",
1156 dp, slen, mtod(mp, u_char *), mp->m_len);
1160 switch (CCP_CODE(dp)) {
1164 /* CCP must be going down - disable compression */
1165 if (sc->sc_flags & SC_CCP_UP) {
1167 sc->sc_flags &= ~(SC_CCP_UP | SC_COMP_RUN | SC_DECOMP_RUN);
1173 if (sc->sc_flags & SC_CCP_OPEN && !(sc->sc_flags & SC_CCP_UP)
1174 && slen >= CCP_HDRLEN + CCP_OPT_MINLEN
1175 && slen >= CCP_OPT_LENGTH(dp + CCP_HDRLEN) + CCP_HDRLEN) {
1177 /* we're agreeing to send compressed packets. */
1178 if (sc->sc_xc_state != NULL
1179 && (*sc->sc_xcomp->comp_init)
1180 (sc->sc_xc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN,
1181 sc->sc_if.if_dunit, 0, sc->sc_flags & SC_DEBUG)) {
1183 sc->sc_flags |= SC_COMP_RUN;
1187 /* peer is agreeing to send compressed packets. */
1188 if (sc->sc_rc_state != NULL
1189 && (*sc->sc_rcomp->decomp_init)
1190 (sc->sc_rc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN,
1191 sc->sc_if.if_dunit, 0, sc->sc_mru,
1192 sc->sc_flags & SC_DEBUG)) {
1194 sc->sc_flags |= SC_DECOMP_RUN;
1195 sc->sc_flags &= ~(SC_DC_ERROR | SC_DC_FERROR);
1203 if (sc->sc_flags & SC_CCP_UP) {
1205 if (sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN))
1206 (*sc->sc_xcomp->comp_reset)(sc->sc_xc_state);
1208 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) {
1209 (*sc->sc_rcomp->decomp_reset)(sc->sc_rc_state);
1211 sc->sc_flags &= ~SC_DC_ERROR;
1221 * CCP is down; free (de)compressor state if necessary.
1224 ppp_ccp_closed(struct ppp_softc *sc)
1226 if (sc->sc_xc_state) {
1227 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state);
1228 sc->sc_xc_state = NULL;
1230 if (sc->sc_rc_state) {
1231 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state);
1232 sc->sc_rc_state = NULL;
1235 #endif /* PPP_COMPRESS */
1238 * PPP packet input routine.
1239 * The caller has checked and removed the FCS and has inserted
1240 * the address/control bytes and the protocol high byte if they
1244 ppppktin(struct ppp_softc *sc, struct mbuf *m, int lost)
1249 m->m_flags |= M_ERRMARK;
1250 IF_ENQUEUE(&sc->sc_rawq, m);
1251 schednetisr(NETISR_PPP);
1257 * Process a received PPP packet, doing decompression as necessary.
1258 * Should be called at splsoftnet.
1260 #define COMPTYPE(proto) ((proto) == PPP_VJC_COMP? TYPE_COMPRESSED_TCP: \
1261 TYPE_UNCOMPRESSED_TCP)
1264 ppp_inproc(struct ppp_softc *sc, struct mbuf *m)
1266 struct ifnet *ifp = &sc->sc_if;
1268 int ilen = 0, proto, rv;
1269 u_char *cp, adrs, ctrl;
1270 struct mbuf *mp, *dmp = NULL;
1277 ASSERT_IFNET_SERIALIZED_ALL(ifp);
1279 sc->sc_stats.ppp_ipackets++;
1281 if (sc->sc_flags & SC_LOG_INPKT) {
1283 for (mp = m; mp != NULL; mp = mp->m_next)
1285 kprintf("%s: got %d bytes\n", ifp->if_xname, ilen);
1289 cp = mtod(m, u_char *);
1290 adrs = PPP_ADDRESS(cp);
1291 ctrl = PPP_CONTROL(cp);
1292 proto = PPP_PROTOCOL(cp);
1294 if (m->m_flags & M_ERRMARK) {
1295 m->m_flags &= ~M_ERRMARK;
1297 sc->sc_flags |= SC_VJ_RESET;
1303 * Decompress this packet if necessary, update the receiver's
1304 * dictionary, or take appropriate action on a CCP packet.
1306 if (proto == PPP_COMP && sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)
1307 && !(sc->sc_flags & SC_DC_ERROR) && !(sc->sc_flags & SC_DC_FERROR)) {
1308 /* decompress this packet */
1309 rv = (*sc->sc_rcomp->decompress)(sc->sc_rc_state, m, &dmp);
1310 if (rv == DECOMP_OK) {
1313 /* no error, but no decompressed packet produced */
1317 cp = mtod(m, u_char *);
1318 proto = PPP_PROTOCOL(cp);
1322 * An error has occurred in decompression.
1323 * Pass the compressed packet up to pppd, which may take
1324 * CCP down or issue a Reset-Req.
1326 if (sc->sc_flags & SC_DEBUG)
1327 kprintf("%s: decompress failed %d\n", ifp->if_xname, rv);
1329 sc->sc_flags |= SC_VJ_RESET;
1330 if (rv == DECOMP_ERROR)
1331 sc->sc_flags |= SC_DC_ERROR;
1333 sc->sc_flags |= SC_DC_FERROR;
1338 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) {
1339 (*sc->sc_rcomp->incomp)(sc->sc_rc_state, m);
1341 if (proto == PPP_CCP) {
1348 for (mp = m; mp != NULL; mp = mp->m_next)
1352 if (sc->sc_flags & SC_VJ_RESET) {
1354 * If we've missed a packet, we must toss subsequent compressed
1355 * packets which don't have an explicit connection ID.
1358 sl_uncompress_tcp(NULL, 0, TYPE_ERROR, sc->sc_comp);
1360 sc->sc_flags &= ~SC_VJ_RESET;
1365 * See if we have a VJ-compressed packet to uncompress.
1367 if (proto == PPP_VJC_COMP) {
1368 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == NULL)
1371 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN,
1372 ilen - PPP_HDRLEN, TYPE_COMPRESSED_TCP,
1373 sc->sc_comp, &iphdr, &hlen);
1376 if (sc->sc_flags & SC_DEBUG)
1377 kprintf("%s: VJ uncompress failed on type comp\n",
1382 /* Copy the PPP and IP headers into a new mbuf. */
1383 MGETHDR(mp, MB_DONTWAIT, MT_DATA);
1388 if (hlen + PPP_HDRLEN > MHLEN) {
1389 MCLGET(mp, MB_DONTWAIT);
1390 if (M_TRAILINGSPACE(mp) < hlen + PPP_HDRLEN) {
1392 goto bad; /* lose if big headers and no clusters */
1395 cp = mtod(mp, u_char *);
1401 bcopy(iphdr, cp + PPP_HDRLEN, hlen);
1402 mp->m_len = hlen + PPP_HDRLEN;
1405 * Trim the PPP and VJ headers off the old mbuf
1406 * and stick the new and old mbufs together.
1408 m->m_data += PPP_HDRLEN + xlen;
1409 m->m_len -= PPP_HDRLEN + xlen;
1410 if (m->m_len <= M_TRAILINGSPACE(mp)) {
1411 bcopy(mtod(m, u_char *), mtod(mp, u_char *) + mp->m_len, m->m_len);
1412 mp->m_len += m->m_len;
1413 mp->m_next = m_free(m);
1418 ilen += hlen - xlen;
1420 } else if (proto == PPP_VJC_UNCOMP) {
1421 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == NULL)
1424 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN,
1425 ilen - PPP_HDRLEN, TYPE_UNCOMPRESSED_TCP,
1426 sc->sc_comp, &iphdr, &hlen);
1429 if (sc->sc_flags & SC_DEBUG)
1430 kprintf("%s: VJ uncompress failed on type uncomp\n",
1441 * If the packet will fit in a header mbuf, don't waste a
1442 * whole cluster on it.
1444 if (ilen <= MHLEN && M_IS_CLUSTER(m)) {
1445 MGETHDR(mp, MB_DONTWAIT, MT_DATA);
1447 m_copydata(m, 0, ilen, mtod(mp, caddr_t));
1453 m->m_pkthdr.len = ilen;
1454 m->m_pkthdr.rcvif = ifp;
1456 if ((proto & 0x8000) == 0) {
1459 * See whether we want to pass this packet, and
1460 * if it counts as link activity.
1462 adrs = *mtod(m, u_char *); /* save address field */
1463 *mtod(m, u_char *) = 0; /* indicate inbound */
1464 if (sc->sc_pass_filt.bf_insns != NULL
1465 && bpf_filter(sc->sc_pass_filt.bf_insns, (u_char *) m,
1467 /* drop this packet */
1471 if (sc->sc_active_filt.bf_insns == NULL
1472 || bpf_filter(sc->sc_active_filt.bf_insns, (u_char *) m, ilen, 0))
1473 sc->sc_last_recv = time_second;
1475 *mtod(m, u_char *) = adrs;
1478 * Record the time that we received this packet.
1480 sc->sc_last_recv = time_second;
1481 #endif /* PPP_FILTER */
1484 BPF_MTAP(&sc->sc_if, m);
1491 * IP packet - take off the ppp header and pass it up to IP.
1493 if ((ifp->if_flags & IFF_UP) == 0
1494 || sc->sc_npmode[NP_IP] != NPMODE_PASS) {
1495 /* interface is down - drop the packet. */
1499 m->m_pkthdr.len -= PPP_HDRLEN;
1500 m->m_data += PPP_HDRLEN;
1501 m->m_len -= PPP_HDRLEN;
1503 if (ipflow_fastforward(m))
1512 * IPX packet - take off the ppp header and pass it up to IPX.
1514 if ((sc->sc_if.if_flags & IFF_UP) == 0
1515 /* XXX: || sc->sc_npmode[NP_IPX] != NPMODE_PASS*/) {
1516 /* interface is down - drop the packet. */
1520 m->m_pkthdr.len -= PPP_HDRLEN;
1521 m->m_data += PPP_HDRLEN;
1522 m->m_len -= PPP_HDRLEN;
1524 sc->sc_last_recv = time_second; /* update time of last pkt rcvd */
1530 * Some other protocol - place on input queue for read().
1536 * If we found a netproto just pass it to the proto. Otherwise queue
1537 * the packet to the tty (e.g. pppd). Note that sc_ctlp() must be
1538 * called EXACTLY once per packet queued.
1541 struct ifqueue *inq = &sc->sc_inq;
1543 if (IF_QFULL(inq)) {
1552 rv = (netisr_queue(isr, m) == 0);
1556 if (sc->sc_flags & SC_DEBUG)
1557 kprintf("%s: input queue full\n", ifp->if_xname);
1563 ifp->if_ibytes += ilen;
1564 getmicrotime(&ifp->if_lastchange);
1571 sc->sc_if.if_ierrors++;
1572 sc->sc_stats.ppp_ierrors++;
1575 #define MAX_DUMP_BYTES 128
1578 pppdumpm(struct mbuf *m0)
1580 char buf[3*MAX_DUMP_BYTES+4];
1584 for (m = m0; m; m = m->m_next) {
1586 u_char *rptr = (u_char *)m->m_data;
1589 if (bp > buf + sizeof(buf) - 4)
1591 *bp++ = hex2ascii(*rptr >> 4);
1592 *bp++ = hex2ascii(*rptr++ & 0xf);
1596 if (bp > buf + sizeof(buf) - 3)
1606 kprintf("%s\n", buf);
1610 * a wrapper to transmit a packet from if_start since ALTQ uses
1611 * if_start to send a packet.
1614 ppp_ifstart(struct ifnet *ifp, struct ifaltq_subque *ifsq __unused)
1616 struct ppp_softc *sc;
1619 (*sc->sc_start)(sc);