/* $NetBSD: if_ppp.c,v 1.30 1996/03/19 01:00:49 paulus Exp $ */ /* * if_ppp.c - Point-to-Point Protocol (PPP) Asynchronous driver. * * Copyright (c) 1989 Carnegie Mellon University. * All rights reserved. * * Redistribution and use in source and binary forms are permitted * provided that the above copyright notice and this paragraph are * duplicated in all such forms and that any documentation, * advertising materials, and other materials related to such * distribution and use acknowledge that the software was developed * by Carnegie Mellon University. The name of the * University may not be used to endorse or promote products derived * from this software without specific prior written permission. * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. * * Drew D. Perkins * Carnegie Mellon University * 4910 Forbes Ave. * Pittsburgh, PA 15213 * (412) 268-8576 * ddp@andrew.cmu.edu * * Based on: * @(#)if_sl.c 7.6.1.2 (Berkeley) 2/15/89 * * Copyright (c) 1987 Regents of the University of California. * All rights reserved. * * Redistribution and use in source and binary forms are permitted * provided that the above copyright notice and this paragraph are * duplicated in all such forms and that any documentation, * advertising materials, and other materials related to such * distribution and use acknowledge that the software was developed * by the University of California, Berkeley. The name of the * University may not be used to endorse or promote products derived * from this software without specific prior written permission. * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. * * Serial Line interface * * Rick Adams * Center for Seismic Studies * 1300 N 17th Street, Suite 1450 * Arlington, Virginia 22209 * (703)276-7900 * rick@seismo.ARPA * seismo!rick * * Pounded on heavily by Chris Torek (chris@mimsy.umd.edu, umcp-cs!chris). * Converted to 4.3BSD Beta by Chris Torek. * Other changes made at Berkeley, based in part on code by Kirk Smith. * * Converted to 4.3BSD+ 386BSD by Brad Parker (brad@cayman.com) * Added VJ tcp header compression; more unified ioctls * * Extensively modified by Paul Mackerras (paulus@cs.anu.edu.au). * Cleaned up a lot of the mbuf-related code to fix bugs that * caused system crashes and packet corruption. Changed pppstart * so that it doesn't just give up with a collision if the whole * packet doesn't fit in the output ring buffer. * * Added priority queueing for interactive IP packets, following * the model of if_sl.c, plus hooks for bpf. * Paul Mackerras (paulus@cs.anu.edu.au). */ /* from if_sl.c,v 1.11 84/10/04 12:54:47 rick Exp */ /* from NetBSD: if_ppp.c,v 1.15.2.2 1994/07/28 05:17:58 cgd Exp */ #include "ppp.h" #if NPPP > 0 #define VJC #define PPP_COMPRESS #include #include #include #include #include #include #include #include #include #include #include #include #include #include #if INET #include #include #include #include #endif #include "bpfilter.h" #if NBPFILTER > 0 #include #include #endif #ifdef VJC #include #endif #include #include #include #include #ifdef PPP_COMPRESS #define PACKETPTR struct mbuf * #include #endif static void ppp_requeue __P((struct ppp_softc *)); static void ppp_outpkt __P((struct ppp_softc *)); static void ppp_ccp __P((struct ppp_softc *, struct mbuf *m, int rcvd)); static void ppp_ccp_closed __P((struct ppp_softc *)); static void ppp_inproc __P((struct ppp_softc *, struct mbuf *)); static void pppdumpm __P((struct mbuf *m0)); /* * Some useful mbuf macros not in mbuf.h. */ #define M_IS_CLUSTER(m) ((m)->m_flags & M_EXT) #define M_DATASTART(m) \ (M_IS_CLUSTER(m) ? (m)->m_ext.ext_buf : \ (m)->m_flags & M_PKTHDR ? (m)->m_pktdat : (m)->m_dat) #define M_DATASIZE(m) \ (M_IS_CLUSTER(m) ? (m)->m_ext.ext_size : \ (m)->m_flags & M_PKTHDR ? MHLEN: MLEN) /* * We steal two bits in the mbuf m_flags, to mark high-priority packets * for output, and received packets following lost/corrupted packets. */ #define M_HIGHPRI 0x2000 /* output packet for sc_fastq */ #define M_ERRMARK 0x4000 /* steal a bit in mbuf m_flags */ #ifdef PPP_COMPRESS /* * List of compressors we know about. * We leave some space so maybe we can modload compressors. */ extern struct compressor ppp_bsd_compress; extern struct compressor ppp_deflate; struct compressor *ppp_compressors[8] = { #if DO_BSD_COMPRESS && defined(PPP_BSDCOMP) &ppp_bsd_compress, #endif #if DO_DEFLATE && defined(PPP_DEFLATE) &ppp_deflate, #endif NULL }; #endif /* PPP_COMPRESS */ /* * Called from boot code to establish ppp interfaces. */ void pppattach() { register struct ppp_softc *sc; register int i = 0; for (sc = ppp_softc; i < NPPP; sc++) { sc->sc_if.if_name = "ppp"; sc->sc_if.if_unit = i++; sc->sc_if.if_mtu = PPP_MTU; sc->sc_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST; sc->sc_if.if_type = IFT_PPP; sc->sc_if.if_hdrlen = PPP_HDRLEN; sc->sc_if.if_ioctl = pppsioctl; sc->sc_if.if_output = pppoutput; sc->sc_if.if_snd.ifq_maxlen = IFQ_MAXLEN; sc->sc_inq.ifq_maxlen = IFQ_MAXLEN; sc->sc_fastq.ifq_maxlen = IFQ_MAXLEN; sc->sc_rawq.ifq_maxlen = IFQ_MAXLEN; if_attach(&sc->sc_if); #if NBPFILTER > 0 bpfattach(&sc->sc_bpf, &sc->sc_if, DLT_PPP, PPP_HDRLEN); #endif } } /* * Allocate a ppp interface unit and initialize it. */ struct ppp_softc * pppalloc(pid) pid_t pid; { int nppp, i; struct ppp_softc *sc; for (nppp = 0, sc = ppp_softc; nppp < NPPP; nppp++, sc++) if (sc->sc_xfer == pid) { sc->sc_xfer = 0; return sc; } for (nppp = 0, sc = ppp_softc; nppp < NPPP; nppp++, sc++) if (sc->sc_devp == NULL) break; if (nppp >= NPPP) return NULL; sc->sc_flags = 0; sc->sc_mru = PPP_MRU; sc->sc_relinq = NULL; bzero((char *)&sc->sc_stats, sizeof(sc->sc_stats)); #ifdef VJC MALLOC(sc->sc_comp, struct slcompress *, sizeof(struct slcompress), M_DEVBUF, M_NOWAIT); if (sc->sc_comp) sl_compress_init(sc->sc_comp, -1); #endif #ifdef PPP_COMPRESS sc->sc_xc_state = NULL; sc->sc_rc_state = NULL; #endif /* PPP_COMPRESS */ for (i = 0; i < NUM_NP; ++i) sc->sc_npmode[i] = NPMODE_ERROR; sc->sc_npqueue = NULL; sc->sc_npqtail = &sc->sc_npqueue; sc->sc_last_sent = sc->sc_last_recv = time.tv_sec; return sc; } /* * Deallocate a ppp unit. Must be called at splsoftnet or higher. */ void pppdealloc(sc) struct ppp_softc *sc; { struct mbuf *m; if_down(&sc->sc_if); sc->sc_if.if_flags &= ~(IFF_UP|IFF_RUNNING); sc->sc_devp = NULL; sc->sc_xfer = 0; for (;;) { IF_DEQUEUE(&sc->sc_rawq, m); if (m == NULL) break; m_freem(m); } for (;;) { IF_DEQUEUE(&sc->sc_inq, m); if (m == NULL) break; m_freem(m); } for (;;) { IF_DEQUEUE(&sc->sc_fastq, m); if (m == NULL) break; m_freem(m); } while ((m = sc->sc_npqueue) != NULL) { sc->sc_npqueue = m->m_nextpkt; m_freem(m); } if (sc->sc_togo != NULL) { m_freem(sc->sc_togo); sc->sc_togo = NULL; } #ifdef PPP_COMPRESS ppp_ccp_closed(sc); sc->sc_xc_state = NULL; sc->sc_rc_state = NULL; #endif /* PPP_COMPRESS */ if (sc->sc_pass_filt.bf_insns != 0) { FREE(sc->sc_pass_filt.bf_insns, M_DEVBUF); sc->sc_pass_filt.bf_insns = 0; sc->sc_pass_filt.bf_len = 0; } if (sc->sc_active_filt.bf_insns != 0) { FREE(sc->sc_active_filt.bf_insns, M_DEVBUF); sc->sc_active_filt.bf_insns = 0; sc->sc_active_filt.bf_len = 0; } #ifdef VJC if (sc->sc_comp != 0) { FREE(sc->sc_comp, M_DEVBUF); sc->sc_comp = 0; } #endif } /* * Ioctl routine for generic ppp devices. */ int pppioctl(sc, cmd, data, flag, p) struct ppp_softc *sc; u_long cmd; caddr_t data; int flag; struct proc *p; { int s, error, flags, mru, nb, npx; struct ppp_option_data *odp; struct compressor **cp; struct npioctl *npi; time_t t; struct bpf_program *bp, *nbp; struct bpf_insn *newcode, *oldcode; int newcodelen; #ifdef PPP_COMPRESS u_char ccp_option[CCP_MAX_OPTION_LENGTH]; #endif switch (cmd) { case FIONREAD: *(int *)data = sc->sc_inq.ifq_len; break; case PPPIOCGUNIT: *(int *)data = sc->sc_if.if_unit; break; case PPPIOCGFLAGS: *(u_int *)data = sc->sc_flags; break; case PPPIOCSFLAGS: if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) return (error); flags = *(int *)data & SC_MASK; s = splsoftnet(); #ifdef PPP_COMPRESS if (sc->sc_flags & SC_CCP_OPEN && !(flags & SC_CCP_OPEN)) ppp_ccp_closed(sc); #endif splhigh(); sc->sc_flags = (sc->sc_flags & ~SC_MASK) | flags; splx(s); break; case PPPIOCSMRU: if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) return (error); mru = *(int *)data; if (mru >= PPP_MRU && mru <= PPP_MAXMRU) sc->sc_mru = mru; break; case PPPIOCGMRU: *(int *)data = sc->sc_mru; break; #ifdef VJC case PPPIOCSMAXCID: if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) return (error); if (sc->sc_comp) { s = splsoftnet(); sl_compress_init(sc->sc_comp, *(int *)data); splx(s); } break; #endif case PPPIOCXFERUNIT: if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) return (error); sc->sc_xfer = p->p_pid; break; #ifdef PPP_COMPRESS case PPPIOCSCOMPRESS: if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) return (error); odp = (struct ppp_option_data *) data; nb = odp->length; if (nb > sizeof(ccp_option)) nb = sizeof(ccp_option); if ((error = copyin(odp->ptr, ccp_option, nb)) != 0) return (error); if (ccp_option[1] < 2) /* preliminary check on the length byte */ return (EINVAL); for (cp = ppp_compressors; *cp != NULL; ++cp) if ((*cp)->compress_proto == ccp_option[0]) { /* * Found a handler for the protocol - try to allocate * a compressor or decompressor. */ error = 0; if (odp->transmit) { s = splsoftnet(); if (sc->sc_xc_state != NULL) (*sc->sc_xcomp->comp_free)(sc->sc_xc_state); sc->sc_xcomp = *cp; sc->sc_xc_state = (*cp)->comp_alloc(ccp_option, nb); if (sc->sc_xc_state == NULL) { if (sc->sc_flags & SC_DEBUG) printf("ppp%d: comp_alloc failed\n", sc->sc_if.if_unit); error = ENOBUFS; } splhigh(); sc->sc_flags &= ~SC_COMP_RUN; splx(s); } else { s = splsoftnet(); if (sc->sc_rc_state != NULL) (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state); sc->sc_rcomp = *cp; sc->sc_rc_state = (*cp)->decomp_alloc(ccp_option, nb); if (sc->sc_rc_state == NULL) { if (sc->sc_flags & SC_DEBUG) printf("ppp%d: decomp_alloc failed\n", sc->sc_if.if_unit); error = ENOBUFS; } splhigh(); sc->sc_flags &= ~SC_DECOMP_RUN; splx(s); } return (error); } if (sc->sc_flags & SC_DEBUG) printf("ppp%d: no compressor for [%x %x %x], %x\n", sc->sc_if.if_unit, ccp_option[0], ccp_option[1], ccp_option[2], nb); return (EINVAL); /* no handler found */ #endif /* PPP_COMPRESS */ case PPPIOCGNPMODE: case PPPIOCSNPMODE: npi = (struct npioctl *) data; switch (npi->protocol) { case PPP_IP: npx = NP_IP; break; default: return EINVAL; } if (cmd == PPPIOCGNPMODE) { npi->mode = sc->sc_npmode[npx]; } else { if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) return (error); if (npi->mode != sc->sc_npmode[npx]) { s = splsoftnet(); sc->sc_npmode[npx] = npi->mode; if (npi->mode != NPMODE_QUEUE) { ppp_requeue(sc); (*sc->sc_start)(sc); } splx(s); } } break; case PPPIOCGIDLE: s = splsoftnet(); t = time.tv_sec; ((struct ppp_idle *)data)->xmit_idle = t - sc->sc_last_sent; ((struct ppp_idle *)data)->recv_idle = t - sc->sc_last_recv; splx(s); break; case PPPIOCSPASS: case PPPIOCSACTIVE: nbp = (struct bpf_program *) data; if ((unsigned) nbp->bf_len > BPF_MAXINSNS) return EINVAL; newcodelen = nbp->bf_len * sizeof(struct bpf_insn); if (newcodelen != 0) { MALLOC(newcode, struct bpf_insn *, newcodelen, M_DEVBUF, M_WAITOK); if (newcode == 0) { return EINVAL; /* or sumpin */ } if ((error = copyin((caddr_t)nbp->bf_insns, (caddr_t)newcode, newcodelen)) != 0) { FREE(newcode, M_DEVBUF); return error; } if (!bpf_validate(newcode, nbp->bf_len)) { FREE(newcode, M_DEVBUF); return EINVAL; } } else newcode = 0; bp = (cmd == PPPIOCSPASS)? &sc->sc_pass_filt: &sc->sc_active_filt; oldcode = bp->bf_insns; s = splimp(); bp->bf_len = nbp->bf_len; bp->bf_insns = newcode; splx(s); if (oldcode != 0) FREE(oldcode, M_DEVBUF); break; default: return (-1); } return (0); } /* * Process an ioctl request to the ppp network interface. */ int pppsioctl(ifp, cmd, data) register struct ifnet *ifp; u_long cmd; caddr_t data; { struct proc *p = curproc; /* XXX */ register struct ppp_softc *sc = &ppp_softc[ifp->if_unit]; register struct ifaddr *ifa = (struct ifaddr *)data; register struct ifreq *ifr = (struct ifreq *)data; struct ppp_stats *psp; #ifdef PPP_COMPRESS struct ppp_comp_stats *pcp; #endif int s = splimp(), error = 0; switch (cmd) { case SIOCSIFFLAGS: if ((ifp->if_flags & IFF_RUNNING) == 0) ifp->if_flags &= ~IFF_UP; break; case SIOCSIFADDR: if (ifa->ifa_addr->sa_family != AF_INET) error = EAFNOSUPPORT; break; case SIOCSIFDSTADDR: if (ifa->ifa_addr->sa_family != AF_INET) error = EAFNOSUPPORT; break; case SIOCSIFMTU: if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) break; sc->sc_if.if_mtu = ifr->ifr_mtu; break; case SIOCGIFMTU: ifr->ifr_mtu = sc->sc_if.if_mtu; break; case SIOCADDMULTI: case SIOCDELMULTI: if (ifr == 0) { error = EAFNOSUPPORT; break; } switch(ifr->ifr_addr.sa_family) { #ifdef INET case AF_INET: break; #endif default: error = EAFNOSUPPORT; break; } break; case SIOCGPPPSTATS: psp = &((struct ifpppstatsreq *) data)->stats; bzero(psp, sizeof(*psp)); psp->p = sc->sc_stats; #if defined(VJC) && !defined(SL_NO_STATS) if (sc->sc_comp) { psp->vj.vjs_packets = sc->sc_comp->sls_packets; psp->vj.vjs_compressed = sc->sc_comp->sls_compressed; psp->vj.vjs_searches = sc->sc_comp->sls_searches; psp->vj.vjs_misses = sc->sc_comp->sls_misses; psp->vj.vjs_uncompressedin = sc->sc_comp->sls_uncompressedin; psp->vj.vjs_compressedin = sc->sc_comp->sls_compressedin; psp->vj.vjs_errorin = sc->sc_comp->sls_errorin; psp->vj.vjs_tossed = sc->sc_comp->sls_tossed; } #endif /* VJC */ break; #ifdef PPP_COMPRESS case SIOCGPPPCSTATS: pcp = &((struct ifpppcstatsreq *) data)->stats; bzero(pcp, sizeof(*pcp)); if (sc->sc_xc_state != NULL) (*sc->sc_xcomp->comp_stat)(sc->sc_xc_state, &pcp->c); if (sc->sc_rc_state != NULL) (*sc->sc_rcomp->decomp_stat)(sc->sc_rc_state, &pcp->d); break; #endif /* PPP_COMPRESS */ default: error = EINVAL; } splx(s); return (error); } /* * Queue a packet. Start transmission if not active. * Packet is placed in Information field of PPP frame. */ int pppoutput(ifp, m0, dst, rtp) struct ifnet *ifp; struct mbuf *m0; struct sockaddr *dst; struct rtentry *rtp; { register struct ppp_softc *sc = &ppp_softc[ifp->if_unit]; int protocol, address, control; u_char *cp; int s, error; struct ip *ip; struct ifqueue *ifq; enum NPmode mode; int active, len; struct mbuf *m; if (sc->sc_devp == NULL || (ifp->if_flags & IFF_RUNNING) == 0 || ((ifp->if_flags & IFF_UP) == 0 && dst->sa_family != AF_UNSPEC)) { error = ENETDOWN; /* sort of */ goto bad; } /* * Compute PPP header. */ m0->m_flags &= ~M_HIGHPRI; switch (dst->sa_family) { #ifdef INET case AF_INET: address = PPP_ALLSTATIONS; control = PPP_UI; protocol = PPP_IP; mode = sc->sc_npmode[NP_IP]; /* * If this packet has the "low delay" bit set in the IP header, * put it on the fastq instead. */ ip = mtod(m0, struct ip *); if (ip->ip_tos & IPTOS_LOWDELAY) m0->m_flags |= M_HIGHPRI; break; #endif case AF_UNSPEC: address = PPP_ADDRESS(dst->sa_data); control = PPP_CONTROL(dst->sa_data); protocol = PPP_PROTOCOL(dst->sa_data); mode = NPMODE_PASS; break; default: printf("ppp%d: af%d not supported\n", ifp->if_unit, dst->sa_family); error = EAFNOSUPPORT; goto bad; } /* * Drop this packet, or return an error, if necessary. */ if (mode == NPMODE_ERROR) { error = ENETDOWN; goto bad; } if (mode == NPMODE_DROP) { error = 0; goto bad; } /* * Add PPP header. If no space in first mbuf, allocate another. * (This assumes M_LEADINGSPACE is always 0 for a cluster mbuf.) */ if (M_LEADINGSPACE(m0) < PPP_HDRLEN) { m0 = m_prepend(m0, PPP_HDRLEN, M_DONTWAIT); if (m0 == 0) { error = ENOBUFS; goto bad; } m0->m_len = 0; } else m0->m_data -= PPP_HDRLEN; cp = mtod(m0, u_char *); *cp++ = address; *cp++ = control; *cp++ = protocol >> 8; *cp++ = protocol & 0xff; m0->m_len += PPP_HDRLEN; len = 0; for (m = m0; m != 0; m = m->m_next) len += m->m_len; if (sc->sc_flags & SC_LOG_OUTPKT) { printf("ppp%d output: ", ifp->if_unit); pppdumpm(m0); } /* * Apply the pass and active filters to the packet, * but only if it is a data packet. */ active = 0; if ((protocol & 0x8000) == 0) { *mtod(m0, u_char *) = 1; /* indicates outbound */ if (sc->sc_pass_filt.bf_insns != 0 && bpf_filter(sc->sc_pass_filt.bf_insns, (u_char *) m0, len, 0) == 0) { error = 0; /* drop this packet */ goto bad; } /* * Update the time we sent the most recent packet. */ if (sc->sc_active_filt.bf_insns == 0 || bpf_filter(sc->sc_active_filt.bf_insns, (u_char *) m0, len, 0)) sc->sc_last_sent = time.tv_sec; *mtod(m0, u_char *) = address; } #if NBPFILTER > 0 /* * See if bpf wants to look at the packet. */ if (sc->sc_bpf) bpf_mtap(sc->sc_bpf, m0); #endif /* * Put the packet on the appropriate queue. */ s = splsoftnet(); if (mode == NPMODE_QUEUE) { /* XXX we should limit the number of packets on this queue */ *sc->sc_npqtail = m0; m0->m_nextpkt = NULL; sc->sc_npqtail = &m0->m_nextpkt; } else { ifq = (m0->m_flags & M_HIGHPRI)? &sc->sc_fastq: &ifp->if_snd; if (IF_QFULL(ifq) && dst->sa_family != AF_UNSPEC) { IF_DROP(ifq); splx(s); sc->sc_if.if_oerrors++; sc->sc_stats.ppp_oerrors++; error = ENOBUFS; goto bad; } IF_ENQUEUE(ifq, m0); (*sc->sc_start)(sc); } ifp->if_lastchange = time; ifp->if_opackets++; ifp->if_obytes += len; splx(s); return (0); bad: m_freem(m0); return (error); } /* * After a change in the NPmode for some NP, move packets from the * npqueue to the send queue or the fast queue as appropriate. * Should be called at splsoftnet. */ static void ppp_requeue(sc) struct ppp_softc *sc; { struct mbuf *m, **mpp; struct ifqueue *ifq; enum NPmode mode; for (mpp = &sc->sc_npqueue; (m = *mpp) != NULL; ) { switch (PPP_PROTOCOL(mtod(m, u_char *))) { case PPP_IP: mode = sc->sc_npmode[NP_IP]; break; default: mode = NPMODE_PASS; } switch (mode) { case NPMODE_PASS: /* * This packet can now go on one of the queues to be sent. */ *mpp = m->m_nextpkt; m->m_nextpkt = NULL; ifq = (m->m_flags & M_HIGHPRI)? &sc->sc_fastq: &sc->sc_if.if_snd; if (IF_QFULL(ifq)) { IF_DROP(ifq); sc->sc_if.if_oerrors++; sc->sc_stats.ppp_oerrors++; } else IF_ENQUEUE(ifq, m); break; case NPMODE_DROP: case NPMODE_ERROR: *mpp = m->m_nextpkt; m_freem(m); break; case NPMODE_QUEUE: mpp = &m->m_nextpkt; break; } } sc->sc_npqtail = mpp; } /* * Get a packet to send. This procedure is intended to be called at * spltty or splimp, so it takes little time. If there isn't a packet * waiting to go out, it schedules a software interrupt to prepare a * new packet; the device start routine gets called again when a * packet is ready. */ struct mbuf * ppp_dequeue(sc) struct ppp_softc *sc; { struct mbuf *m; int s = splhigh(); m = sc->sc_togo; if (m) { /* * Had a packet waiting - send it. */ sc->sc_togo = NULL; sc->sc_flags |= SC_TBUSY; splx(s); return m; } /* * Remember we wanted a packet and schedule a software interrupt. */ sc->sc_flags &= ~SC_TBUSY; schednetisr(NETISR_PPP); splx(s); return NULL; } /* * Software interrupt routine, called at splsoftnet. */ void pppintr() { struct ppp_softc *sc; int i, s; struct mbuf *m; sc = ppp_softc; for (i = 0; i < NPPP; ++i, ++sc) { if (!(sc->sc_flags & SC_TBUSY) && sc->sc_togo == NULL && (sc->sc_if.if_snd.ifq_head || sc->sc_fastq.ifq_head)) ppp_outpkt(sc); for (;;) { s = splhigh(); IF_DEQUEUE(&sc->sc_rawq, m); splx(s); if (m == NULL) break; ppp_inproc(sc, m); } } } /* * Grab another packet off a queue and apply VJ compression, * packet compression, address/control and/or protocol compression * if enabled. Should be called at splsoftnet. */ static void ppp_outpkt(sc) struct ppp_softc *sc; { struct mbuf *m, *mp; u_char *cp; int address, control, protocol; /* * Grab a packet to send: first try the fast queue, then the * normal queue. */ IF_DEQUEUE(&sc->sc_fastq, m); if (m == NULL) IF_DEQUEUE(&sc->sc_if.if_snd, m); if (m == NULL) return; ++sc->sc_stats.ppp_opackets; /* * Extract the ppp header of the new packet. * The ppp header will be in one mbuf. */ cp = mtod(m, u_char *); address = PPP_ADDRESS(cp); control = PPP_CONTROL(cp); protocol = PPP_PROTOCOL(cp); switch (protocol) { case PPP_IP: #ifdef VJC /* * If the packet is a TCP/IP packet, see if we can compress it. */ if ((sc->sc_flags & SC_COMP_TCP) && sc->sc_comp != NULL) { struct ip *ip; int type; mp = m; ip = (struct ip *) (cp + PPP_HDRLEN); if (mp->m_len <= PPP_HDRLEN) { mp = mp->m_next; if (mp == NULL) break; ip = mtod(mp, struct ip *); } /* this code assumes the IP/TCP header is in one non-shared mbuf */ if (ip->ip_p == IPPROTO_TCP) { type = sl_compress_tcp(mp, ip, sc->sc_comp, !(sc->sc_flags & SC_NO_TCP_CCID)); switch (type) { case TYPE_UNCOMPRESSED_TCP: protocol = PPP_VJC_UNCOMP; break; case TYPE_COMPRESSED_TCP: protocol = PPP_VJC_COMP; cp = mtod(m, u_char *); cp[0] = address; /* header has moved */ cp[1] = control; cp[2] = 0; break; } cp[3] = protocol; /* update protocol in PPP header */ } } #endif /* VJC */ break; #ifdef PPP_COMPRESS case PPP_CCP: ppp_ccp(sc, m, 0); break; #endif /* PPP_COMPRESS */ } #ifdef PPP_COMPRESS if (protocol != PPP_LCP && protocol != PPP_CCP && sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) { struct mbuf *mcomp = NULL; int slen, clen; slen = 0; for (mp = m; mp != NULL; mp = mp->m_next) slen += mp->m_len; clen = (*sc->sc_xcomp->compress) (sc->sc_xc_state, &mcomp, m, slen, (sc->sc_flags & SC_CCP_UP? sc->sc_if.if_mtu: 0)); if (mcomp != NULL) { m_freem(m); m = mcomp; cp = mtod(m, u_char *); protocol = cp[3]; } } #endif /* PPP_COMPRESS */ /* * Compress the address/control and protocol, if possible. */ if (sc->sc_flags & SC_COMP_AC && address == PPP_ALLSTATIONS && control == PPP_UI && protocol != PPP_ALLSTATIONS && protocol != PPP_LCP) { /* can compress address/control */ m->m_data += 2; m->m_len -= 2; } if (sc->sc_flags & SC_COMP_PROT && protocol < 0xFF) { /* can compress protocol */ if (mtod(m, u_char *) == cp) { cp[2] = cp[1]; /* move address/control up */ cp[1] = cp[0]; } ++m->m_data; --m->m_len; } sc->sc_togo = m; (*sc->sc_start)(sc); } #ifdef PPP_COMPRESS /* * Handle a CCP packet. `rcvd' is 1 if the packet was received, * 0 if it is about to be transmitted. */ static void ppp_ccp(sc, m, rcvd) struct ppp_softc *sc; struct mbuf *m; int rcvd; { u_char *dp, *ep; struct mbuf *mp; int slen, s; /* * Get a pointer to the data after the PPP header. */ if (m->m_len <= PPP_HDRLEN) { mp = m->m_next; if (mp == NULL) return; dp = (mp != NULL)? mtod(mp, u_char *): NULL; } else { mp = m; dp = mtod(mp, u_char *) + PPP_HDRLEN; } ep = mtod(mp, u_char *) + mp->m_len; if (dp + CCP_HDRLEN > ep) return; slen = CCP_LENGTH(dp); if (dp + slen > ep) { if (sc->sc_flags & SC_DEBUG) printf("if_ppp/ccp: not enough data in mbuf (%p+%x > %p+%x)\n", dp, slen, mtod(mp, u_char *), mp->m_len); return; } switch (CCP_CODE(dp)) { case CCP_CONFREQ: case CCP_TERMREQ: case CCP_TERMACK: /* CCP must be going down - disable compression */ if (sc->sc_flags & SC_CCP_UP) { s = splhigh(); sc->sc_flags &= ~(SC_CCP_UP | SC_COMP_RUN | SC_DECOMP_RUN); splx(s); } break; case CCP_CONFACK: if (sc->sc_flags & SC_CCP_OPEN && !(sc->sc_flags & SC_CCP_UP) && slen >= CCP_HDRLEN + CCP_OPT_MINLEN && slen >= CCP_OPT_LENGTH(dp + CCP_HDRLEN) + CCP_HDRLEN) { if (!rcvd) { /* we're agreeing to send compressed packets. */ if (sc->sc_xc_state != NULL && (*sc->sc_xcomp->comp_init) (sc->sc_xc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN, sc->sc_if.if_unit, 0, sc->sc_flags & SC_DEBUG)) { s = splhigh(); sc->sc_flags |= SC_COMP_RUN; splx(s); } } else { /* peer is agreeing to send compressed packets. */ if (sc->sc_rc_state != NULL && (*sc->sc_rcomp->decomp_init) (sc->sc_rc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN, sc->sc_if.if_unit, 0, sc->sc_mru, sc->sc_flags & SC_DEBUG)) { s = splhigh(); sc->sc_flags |= SC_DECOMP_RUN; sc->sc_flags &= ~(SC_DC_ERROR | SC_DC_FERROR); splx(s); } } } break; case CCP_RESETACK: if (sc->sc_flags & SC_CCP_UP) { if (!rcvd) { if (sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) (*sc->sc_xcomp->comp_reset)(sc->sc_xc_state); } else { if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) { (*sc->sc_rcomp->decomp_reset)(sc->sc_rc_state); s = splhigh(); sc->sc_flags &= ~SC_DC_ERROR; splx(s); } } } break; } } /* * CCP is down; free (de)compressor state if necessary. */ static void ppp_ccp_closed(sc) struct ppp_softc *sc; { if (sc->sc_xc_state) { (*sc->sc_xcomp->comp_free)(sc->sc_xc_state); sc->sc_xc_state = NULL; } if (sc->sc_rc_state) { (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state); sc->sc_rc_state = NULL; } } #endif /* PPP_COMPRESS */ /* * PPP packet input routine. * The caller has checked and removed the FCS and has inserted * the address/control bytes and the protocol high byte if they * were omitted. */ void ppppktin(sc, m, lost) struct ppp_softc *sc; struct mbuf *m; int lost; { int s = splhigh(); if (lost) m->m_flags |= M_ERRMARK; IF_ENQUEUE(&sc->sc_rawq, m); schednetisr(NETISR_PPP); splx(s); } /* * Process a received PPP packet, doing decompression as necessary. * Should be called at splsoftnet. */ #define COMPTYPE(proto) ((proto) == PPP_VJC_COMP? TYPE_COMPRESSED_TCP: \ TYPE_UNCOMPRESSED_TCP) static void ppp_inproc(sc, m) struct ppp_softc *sc; struct mbuf *m; { struct ifnet *ifp = &sc->sc_if; struct ifqueue *inq; int s, ilen, xlen, proto, rv; u_char *cp, adrs, ctrl; struct mbuf *mp, *dmp = NULL; u_char *iphdr; u_int hlen; sc->sc_stats.ppp_ipackets++; if (sc->sc_flags & SC_LOG_INPKT) { ilen = 0; for (mp = m; mp != NULL; mp = mp->m_next) ilen += mp->m_len; printf("ppp%d: got %d bytes\n", ifp->if_unit, ilen); pppdumpm(m); } cp = mtod(m, u_char *); adrs = PPP_ADDRESS(cp); ctrl = PPP_CONTROL(cp); proto = PPP_PROTOCOL(cp); if (m->m_flags & M_ERRMARK) { m->m_flags &= ~M_ERRMARK; s = splhigh(); sc->sc_flags |= SC_VJ_RESET; splx(s); } #ifdef PPP_COMPRESS /* * Decompress this packet if necessary, update the receiver's * dictionary, or take appropriate action on a CCP packet. */ if (proto == PPP_COMP && sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN) && !(sc->sc_flags & SC_DC_ERROR) && !(sc->sc_flags & SC_DC_FERROR)) { /* decompress this packet */ rv = (*sc->sc_rcomp->decompress)(sc->sc_rc_state, m, &dmp); if (rv == DECOMP_OK) { m_freem(m); if (dmp == NULL) { /* no error, but no decompressed packet produced */ return; } m = dmp; cp = mtod(m, u_char *); proto = PPP_PROTOCOL(cp); } else { /* * An error has occurred in decompression. * Pass the compressed packet up to pppd, which may take * CCP down or issue a Reset-Req. */ if (sc->sc_flags & SC_DEBUG) printf("ppp%d: decompress failed %d\n", ifp->if_unit, rv); s = splhigh(); sc->sc_flags |= SC_VJ_RESET; if (rv == DECOMP_ERROR) sc->sc_flags |= SC_DC_ERROR; else sc->sc_flags |= SC_DC_FERROR; splx(s); } } else { if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) { (*sc->sc_rcomp->incomp)(sc->sc_rc_state, m); } if (proto == PPP_CCP) { ppp_ccp(sc, m, 1); } } #endif ilen = 0; for (mp = m; mp != NULL; mp = mp->m_next) ilen += mp->m_len; #ifdef VJC if (sc->sc_flags & SC_VJ_RESET) { /* * If we've missed a packet, we must toss subsequent compressed * packets which don't have an explicit connection ID. */ if (sc->sc_comp) sl_uncompress_tcp(NULL, 0, TYPE_ERROR, sc->sc_comp); s = splhigh(); sc->sc_flags &= ~SC_VJ_RESET; splx(s); } /* * See if we have a VJ-compressed packet to uncompress. */ if (proto == PPP_VJC_COMP) { if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) goto bad; xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN, ilen - PPP_HDRLEN, TYPE_COMPRESSED_TCP, sc->sc_comp, &iphdr, &hlen); if (xlen <= 0) { if (sc->sc_flags & SC_DEBUG) printf("ppp%d: VJ uncompress failed on type comp\n", ifp->if_unit); goto bad; } /* Copy the PPP and IP headers into a new mbuf. */ MGETHDR(mp, M_DONTWAIT, MT_DATA); if (mp == NULL) goto bad; mp->m_len = 0; mp->m_next = NULL; if (hlen + PPP_HDRLEN > MHLEN) { MCLGET(mp, M_DONTWAIT); if (M_TRAILINGSPACE(mp) < hlen + PPP_HDRLEN) { m_freem(mp); goto bad; /* lose if big headers and no clusters */ } } cp = mtod(mp, u_char *); cp[0] = adrs; cp[1] = ctrl; cp[2] = 0; cp[3] = PPP_IP; proto = PPP_IP; bcopy(iphdr, cp + PPP_HDRLEN, hlen); mp->m_len = hlen + PPP_HDRLEN; /* * Trim the PPP and VJ headers off the old mbuf * and stick the new and old mbufs together. */ m->m_data += PPP_HDRLEN + xlen; m->m_len -= PPP_HDRLEN + xlen; if (m->m_len <= M_TRAILINGSPACE(mp)) { bcopy(mtod(m, u_char *), mtod(mp, u_char *) + mp->m_len, m->m_len); mp->m_len += m->m_len; MFREE(m, mp->m_next); } else mp->m_next = m; m = mp; ilen += hlen - xlen; } else if (proto == PPP_VJC_UNCOMP) { if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) goto bad; xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN, ilen - PPP_HDRLEN, TYPE_UNCOMPRESSED_TCP, sc->sc_comp, &iphdr, &hlen); if (xlen < 0) { if (sc->sc_flags & SC_DEBUG) printf("ppp%d: VJ uncompress failed on type uncomp\n", ifp->if_unit); goto bad; } proto = PPP_IP; cp[3] = PPP_IP; } #endif /* VJC */ /* * If the packet will fit in a header mbuf, don't waste a * whole cluster on it. */ if (ilen <= MHLEN && M_IS_CLUSTER(m)) { MGETHDR(mp, M_DONTWAIT, MT_DATA); if (mp != NULL) { m_copydata(m, 0, ilen, mtod(mp, caddr_t)); m_freem(m); m = mp; m->m_len = ilen; } } m->m_pkthdr.len = ilen; m->m_pkthdr.rcvif = ifp; /* * See whether we want to pass this packet, and * if it counts as link activity. */ if ((proto & 0x8000) == 0) { adrs = *mtod(m, u_char *); /* save address field */ *mtod(m, u_char *) = 0; /* indicate inbound */ if (sc->sc_pass_filt.bf_insns != 0 && bpf_filter(sc->sc_pass_filt.bf_insns, (u_char *) m, ilen, 0) == 0) { /* drop this packet */ m_freem(m); return; } if (sc->sc_active_filt.bf_insns == 0 || bpf_filter(sc->sc_active_filt.bf_insns, (u_char *) m, ilen, 0)) sc->sc_last_recv = time.tv_sec; *mtod(m, u_char *) = adrs; } #if NBPFILTER > 0 /* See if bpf wants to look at the packet. */ if (sc->sc_bpf) bpf_mtap(sc->sc_bpf, m); #endif rv = 0; switch (proto) { #ifdef INET case PPP_IP: /* * IP packet - take off the ppp header and pass it up to IP. */ if ((ifp->if_flags & IFF_UP) == 0 || sc->sc_npmode[NP_IP] != NPMODE_PASS) { /* interface is down - drop the packet. */ m_freem(m); return; } m->m_pkthdr.len -= PPP_HDRLEN; m->m_data += PPP_HDRLEN; m->m_len -= PPP_HDRLEN; schednetisr(NETISR_IP); inq = &ipintrq; break; #endif default: /* * Some other protocol - place on input queue for read(). */ inq = &sc->sc_inq; rv = 1; break; } /* * Put the packet on the appropriate input queue. */ s = splhigh(); if (IF_QFULL(inq)) { IF_DROP(inq); splx(s); if (sc->sc_flags & SC_DEBUG) printf("ppp%d: input queue full\n", ifp->if_unit); ifp->if_iqdrops++; goto bad; } IF_ENQUEUE(inq, m); splx(s); ifp->if_ipackets++; ifp->if_ibytes += ilen; ifp->if_lastchange = time; if (rv) (*sc->sc_ctlp)(sc); return; bad: m_freem(m); sc->sc_if.if_ierrors++; sc->sc_stats.ppp_ierrors++; } #define MAX_DUMP_BYTES 128 static void pppdumpm(m0) struct mbuf *m0; { char buf[3*MAX_DUMP_BYTES+4]; char *bp = buf; struct mbuf *m; static char digits[] = "0123456789abcdef"; for (m = m0; m; m = m->m_next) { int l = m->m_len; u_char *rptr = (u_char *)m->m_data; while (l--) { if (bp > buf + sizeof(buf) - 4) goto done; *bp++ = digits[*rptr >> 4]; /* convert byte to ascii hex */ *bp++ = digits[*rptr++ & 0xf]; } if (m->m_next) { if (bp > buf + sizeof(buf) - 3) goto done; *bp++ = '|'; } else *bp++ = ' '; } done: if (m) *bp++ = '>'; *bp = 0; printf("%s\n", buf); } #endif /* NPPP > 0 */