/* $NetBSD: if_ppp.c,v 1.141 2013/09/18 23:34:55 rmind Exp $ */ /* Id: if_ppp.c,v 1.6 1997/03/04 03:33:00 paulus Exp */ /* * if_ppp.c - Point-to-Point Protocol (PPP) Asynchronous driver. * * Copyright (c) 1984-2000 Carnegie Mellon University. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * * 3. The name "Carnegie Mellon University" must not be used to * endorse or promote products derived from this software without * prior written permission. For permission or any legal * details, please contact * Office of Technology Transfer * Carnegie Mellon University * 5000 Forbes Avenue * Pittsburgh, PA 15213-3890 * (412) 268-4387, fax: (412) 268-7395 * tech-transfer@andrew.cmu.edu * * 4. Redistributions of any form whatsoever must retain the following * acknowledgment: * "This product includes software developed by Computing Services * at Carnegie Mellon University (http://www.cmu.edu/computing/)." * * CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY * AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE * FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. * * 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 */ /* * XXX IMP ME HARDER * * This is an explanation of that comment. This code used to use * splimp() to block both network and tty interrupts. However, * that call is deprecated. So, we have replaced the uses of * splimp() with splhigh() in order to applomplish what it needs * to accomplish, and added that happy little comment. */ #include __KERNEL_RCSID(0, "$NetBSD: if_ppp.c,v 1.141 2013/09/18 23:34:55 rmind Exp $"); #include "ppp.h" #include "opt_inet.h" #include "opt_gateway.h" #include "opt_ppp.h" #ifdef INET #define VJC #endif #define PPP_COMPRESS #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef PPP_FILTER #include #endif #include #include #include #ifdef INET #include #endif #include #include #ifdef VJC #include #endif #include #include #include #include #ifdef PPP_COMPRESS #define PACKETPTR struct mbuf * #include #endif static int pppsioctl(struct ifnet *, u_long, void *); static void ppp_requeue(struct ppp_softc *); static void ppp_ccp(struct ppp_softc *, struct mbuf *m, int rcvd); static void ppp_ccp_closed(struct ppp_softc *); static void ppp_inproc(struct ppp_softc *, struct mbuf *); static void pppdumpm(struct mbuf *m0); #ifdef ALTQ static void ppp_ifstart(struct ifnet *ifp); #endif static void pppintr(void *); /* * 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 define two link layer specific mbuf flags, to mark high-priority * packets for output, and received packets following lost/corrupted * packets. */ #define M_HIGHPRI M_LINK0 /* output packet for sc_fastq */ #define M_ERRMARK M_LINK1 /* rx packet following lost/corrupted pkt */ static int ppp_clone_create(struct if_clone *, int); static int ppp_clone_destroy(struct ifnet *); static struct ppp_softc *ppp_create(const char *, int); static LIST_HEAD(, ppp_softc) ppp_softc_list; static kmutex_t ppp_list_lock; struct if_clone ppp_cloner = IF_CLONE_INITIALIZER("ppp", ppp_clone_create, ppp_clone_destroy); #ifdef PPP_COMPRESS ONCE_DECL(ppp_compressor_mtx_init); static LIST_HEAD(, compressor) ppp_compressors = { NULL }; static kmutex_t ppp_compressors_mtx; static int ppp_compressor_init(void); static struct compressor *ppp_get_compressor(uint8_t); static void ppp_compressor_rele(struct compressor *); #endif /* PPP_COMPRESS */ /* * Called from boot code to establish ppp interfaces. */ void pppattach(void) { extern struct linesw ppp_disc; if (ttyldisc_attach(&ppp_disc) != 0) panic("pppattach"); mutex_init(&ppp_list_lock, MUTEX_DEFAULT, IPL_NONE); LIST_INIT(&ppp_softc_list); if_clone_attach(&ppp_cloner); RUN_ONCE(&ppp_compressor_mtx_init, ppp_compressor_init); } static struct ppp_softc * ppp_create(const char *name, int unit) { struct ppp_softc *sc, *sci, *scl = NULL; sc = malloc(sizeof(*sc), M_DEVBUF, M_WAIT|M_ZERO); mutex_enter(&ppp_list_lock); if (unit == -1) { int i = 0; LIST_FOREACH(sci, &ppp_softc_list, sc_iflist) { scl = sci; if (i < sci->sc_unit) { unit = i; break; } else { #ifdef DIAGNOSTIC KASSERT(i == sci->sc_unit); #endif i++; } } if (unit == -1) unit = i; } else { LIST_FOREACH(sci, &ppp_softc_list, sc_iflist) { scl = sci; if (unit < sci->sc_unit) break; else if (unit == sci->sc_unit) { free(sc, M_DEVBUF); return NULL; } } } if (sci != NULL) LIST_INSERT_BEFORE(sci, sc, sc_iflist); else if (scl != NULL) LIST_INSERT_AFTER(scl, sc, sc_iflist); else LIST_INSERT_HEAD(&ppp_softc_list, sc, sc_iflist); mutex_exit(&ppp_list_lock); if_initname(&sc->sc_if, name, sc->sc_unit = unit); callout_init(&sc->sc_timo_ch, 0); sc->sc_if.if_softc = sc; 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_dlt = DLT_NULL; sc->sc_if.if_ioctl = pppsioctl; sc->sc_if.if_output = pppoutput; #ifdef ALTQ sc->sc_if.if_start = ppp_ifstart; #endif IFQ_SET_MAXLEN(&sc->sc_if.if_snd, IFQ_MAXLEN); sc->sc_inq.ifq_maxlen = IFQ_MAXLEN; sc->sc_fastq.ifq_maxlen = IFQ_MAXLEN; sc->sc_rawq.ifq_maxlen = IFQ_MAXLEN; /* Ratio of 1:2 packets between the regular and the fast queue */ sc->sc_maxfastq = 2; IFQ_SET_READY(&sc->sc_if.if_snd); if_attach(&sc->sc_if); if_alloc_sadl(&sc->sc_if); bpf_attach(&sc->sc_if, DLT_NULL, 0); return sc; } static int ppp_clone_create(struct if_clone *ifc, int unit) { return ppp_create(ifc->ifc_name, unit) == NULL ? EEXIST : 0; } static int ppp_clone_destroy(struct ifnet *ifp) { struct ppp_softc *sc = (struct ppp_softc *)ifp->if_softc; if (sc->sc_devp != NULL) return EBUSY; /* Not removing it */ mutex_enter(&ppp_list_lock); LIST_REMOVE(sc, sc_iflist); mutex_exit(&ppp_list_lock); bpf_detach(ifp); if_detach(ifp); free(sc, M_DEVBUF); return 0; } /* * Allocate a ppp interface unit and initialize it. */ struct ppp_softc * pppalloc(pid_t pid) { struct ppp_softc *sc = NULL, *scf; int i; mutex_enter(&ppp_list_lock); LIST_FOREACH(scf, &ppp_softc_list, sc_iflist) { if (scf->sc_xfer == pid) { scf->sc_xfer = 0; mutex_exit(&ppp_list_lock); return scf; } if (scf->sc_devp == NULL && sc == NULL) sc = scf; } mutex_exit(&ppp_list_lock); if (sc == NULL) sc = ppp_create(ppp_cloner.ifc_name, -1); sc->sc_si = softint_establish(SOFTINT_NET, pppintr, sc); if (sc->sc_si == NULL) { printf("%s: unable to establish softintr\n", sc->sc_if.if_xname); return (NULL); } sc->sc_flags = 0; sc->sc_mru = PPP_MRU; sc->sc_relinq = NULL; (void)memset(&sc->sc_stats, 0, sizeof(sc->sc_stats)); #ifdef VJC sc->sc_comp = malloc(sizeof(struct slcompress), M_DEVBUF, M_NOWAIT); if (sc->sc_comp) sl_compress_init(sc->sc_comp); #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_second; return sc; } /* * Deallocate a ppp unit. Must be called at splsoftnet or higher. */ void pppdealloc(struct ppp_softc *sc) { struct mbuf *m; softint_disestablish(sc->sc_si); 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 */ #ifdef PPP_FILTER if (sc->sc_pass_filt_in.bf_insns != 0) { free(sc->sc_pass_filt_in.bf_insns, M_DEVBUF); sc->sc_pass_filt_in.bf_insns = 0; sc->sc_pass_filt_in.bf_len = 0; } if (sc->sc_pass_filt_out.bf_insns != 0) { free(sc->sc_pass_filt_out.bf_insns, M_DEVBUF); sc->sc_pass_filt_out.bf_insns = 0; sc->sc_pass_filt_out.bf_len = 0; } if (sc->sc_active_filt_in.bf_insns != 0) { free(sc->sc_active_filt_in.bf_insns, M_DEVBUF); sc->sc_active_filt_in.bf_insns = 0; sc->sc_active_filt_in.bf_len = 0; } if (sc->sc_active_filt_out.bf_insns != 0) { free(sc->sc_active_filt_out.bf_insns, M_DEVBUF); sc->sc_active_filt_out.bf_insns = 0; sc->sc_active_filt_out.bf_len = 0; } #endif /* PPP_FILTER */ #ifdef VJC if (sc->sc_comp != 0) { free(sc->sc_comp, M_DEVBUF); sc->sc_comp = 0; } #endif (void)ppp_clone_destroy(&sc->sc_if); } /* * Ioctl routine for generic ppp devices. */ int pppioctl(struct ppp_softc *sc, u_long cmd, void *data, int flag, struct lwp *l) { int s, error, flags, mru, npx; u_int nb; struct ppp_option_data *odp; struct compressor *cp; struct npioctl *npi; time_t t; #ifdef PPP_FILTER struct bpf_program *bp, *nbp; struct bpf_insn *newcode, *oldcode; int newcodelen; #endif /* PPP_FILTER */ #ifdef PPP_COMPRESS u_char ccp_option[CCP_MAX_OPTION_LENGTH]; #endif switch (cmd) { case PPPIOCSFLAGS: case PPPIOCSMRU: case PPPIOCSMAXCID: case PPPIOCSCOMPRESS: case PPPIOCSNPMODE: if (kauth_authorize_network(l->l_cred, KAUTH_NETWORK_INTERFACE, KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, &sc->sc_if, KAUTH_ARG(cmd), NULL) != 0) return (EPERM); break; case PPPIOCXFERUNIT: /* XXX: Why is this privileged?! */ if (kauth_authorize_network(l->l_cred, KAUTH_NETWORK_INTERFACE, KAUTH_REQ_NETWORK_INTERFACE_GETPRIV, &sc->sc_if, KAUTH_ARG(cmd), NULL) != 0) return (EPERM); break; default: break; } switch (cmd) { case FIONREAD: *(int *)data = sc->sc_inq.ifq_len; break; case PPPIOCGUNIT: *(int *)data = sc->sc_unit; break; case PPPIOCGFLAGS: *(u_int *)data = sc->sc_flags; break; case PPPIOCGRAWIN: { struct ppp_rawin *rwin = (struct ppp_rawin *)data; u_char c, q = 0; for (c = sc->sc_rawin_start; c < sizeof(sc->sc_rawin.buf);) rwin->buf[q++] = sc->sc_rawin.buf[c++]; for (c = 0; c < sc->sc_rawin_start;) rwin->buf[q++] = sc->sc_rawin.buf[c++]; rwin->count = sc->sc_rawin.count; } break; case PPPIOCSFLAGS: 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(); /* XXX IMP ME HARDER */ sc->sc_flags = (sc->sc_flags & ~SC_MASK) | flags; splx(s); break; case PPPIOCSMRU: mru = *(int *)data; if (mru >= PPP_MINMRU && mru <= PPP_MAXMRU) sc->sc_mru = mru; break; case PPPIOCGMRU: *(int *)data = sc->sc_mru; break; #ifdef VJC case PPPIOCSMAXCID: if (sc->sc_comp) { s = splsoftnet(); sl_compress_setup(sc->sc_comp, *(int *)data); splx(s); } break; #endif case PPPIOCXFERUNIT: sc->sc_xfer = l->l_proc->p_pid; break; #ifdef PPP_COMPRESS case PPPIOCSCOMPRESS: 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); cp = ppp_get_compressor(ccp_option[0]); if (cp == NULL) { if (sc->sc_flags & SC_DEBUG) printf("%s: no compressor for [%x %x %x], %x\n", sc->sc_if.if_xname, ccp_option[0], ccp_option[1], ccp_option[2], nb); return (EINVAL); /* no handler found */ } /* * 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); ppp_compressor_rele(sc->sc_xcomp); } 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("%s: comp_alloc failed\n", sc->sc_if.if_xname); error = ENOBUFS; } splhigh(); /* XXX IMP ME HARDER */ 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); ppp_compressor_rele(sc->sc_rcomp); } 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("%s: decomp_alloc failed\n", sc->sc_if.if_xname); error = ENOBUFS; } splhigh(); /* XXX IMP ME HARDER */ sc->sc_flags &= ~SC_DECOMP_RUN; splx(s); } return (error); #endif /* PPP_COMPRESS */ case PPPIOCGNPMODE: case PPPIOCSNPMODE: npi = (struct npioctl *) data; switch (npi->protocol) { case PPP_IP: npx = NP_IP; break; case PPP_IPV6: npx = NP_IPV6; break; default: return EINVAL; } if (cmd == PPPIOCGNPMODE) { npi->mode = sc->sc_npmode[npx]; } else { if (npi->mode != sc->sc_npmode[npx]) { s = splnet(); sc->sc_npmode[npx] = npi->mode; if (npi->mode != NPMODE_QUEUE) { ppp_requeue(sc); ppp_restart(sc); } splx(s); } } break; case PPPIOCGIDLE: s = splsoftnet(); t = time_second; ((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; #ifdef PPP_FILTER case PPPIOCSPASS: case PPPIOCSACTIVE: /* These are no longer supported. */ return EOPNOTSUPP; case PPPIOCSIPASS: case PPPIOCSOPASS: case PPPIOCSIACTIVE: case PPPIOCSOACTIVE: 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) { newcode = malloc(newcodelen, M_DEVBUF, M_WAITOK); /* WAITOK -- malloc() never fails. */ if ((error = copyin((void *)nbp->bf_insns, (void *)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; switch (cmd) { case PPPIOCSIPASS: bp = &sc->sc_pass_filt_in; break; case PPPIOCSOPASS: bp = &sc->sc_pass_filt_out; break; case PPPIOCSIACTIVE: bp = &sc->sc_active_filt_in; break; case PPPIOCSOACTIVE: bp = &sc->sc_active_filt_out; break; default: free(newcode, M_DEVBUF); return (EPASSTHROUGH); } oldcode = bp->bf_insns; s = splnet(); bp->bf_len = nbp->bf_len; bp->bf_insns = newcode; splx(s); if (oldcode != 0) free(oldcode, M_DEVBUF); break; #endif /* PPP_FILTER */ default: return (EPASSTHROUGH); } return (0); } /* * Process an ioctl request to the ppp network interface. */ static int pppsioctl(struct ifnet *ifp, u_long cmd, void *data) { struct ppp_softc *sc = ifp->if_softc; struct ifaddr *ifa = (struct ifaddr *)data; struct ifreq *ifr = (struct ifreq *)data; struct ppp_stats *psp; #ifdef PPP_COMPRESS struct ppp_comp_stats *pcp; #endif int s = splnet(), error = 0; switch (cmd) { case SIOCSIFFLAGS: if ((error = ifioctl_common(ifp, cmd, data)) != 0) break; if ((ifp->if_flags & IFF_RUNNING) == 0) ifp->if_flags &= ~IFF_UP; break; case SIOCINITIFADDR: switch (ifa->ifa_addr->sa_family) { #ifdef INET case AF_INET: break; #endif #ifdef INET6 case AF_INET6: break; #endif default: error = EAFNOSUPPORT; break; } break; case SIOCADDMULTI: case SIOCDELMULTI: if (ifr == NULL) { error = EAFNOSUPPORT; break; } switch (ifreq_getaddr(cmd, ifr)->sa_family) { #ifdef INET case AF_INET: break; #endif #ifdef INET6 case AF_INET6: break; #endif default: error = EAFNOSUPPORT; break; } break; case SIOCGPPPSTATS: psp = &((struct ifpppstatsreq *) data)->stats; memset(psp, 0, 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; memset(pcp, 0, 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: if ((error = ifioctl_common(&sc->sc_if, cmd, data)) == ENETRESET) error = 0; break; } splx(s); return (error); } /* * Queue a packet. Start transmission if not active. * Packet is placed in Information field of PPP frame. */ int pppoutput(struct ifnet *ifp, struct mbuf *m0, const struct sockaddr *dst, struct rtentry *rtp) { struct ppp_softc *sc = ifp->if_softc; int protocol, address, control; u_char *cp; int s, error; #ifdef INET struct ip *ip; #endif struct ifqueue *ifq; enum NPmode mode; int len; ALTQ_DECL(struct altq_pktattr pktattr;) 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; } IFQ_CLASSIFY(&ifp->if_snd, m0, dst->sa_family, &pktattr); /* * 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 #ifdef INET6 case AF_INET6: address = PPP_ALLSTATIONS; /*XXX*/ control = PPP_UI; /*XXX*/ protocol = PPP_IPV6; mode = sc->sc_npmode[NP_IPV6]; #if 0 /* XXX flowinfo/traffic class, maybe? */ /* * 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; #endif 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("%s: af%d not supported\n", ifp->if_xname, 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. */ M_PREPEND(m0, PPP_HDRLEN, M_DONTWAIT); if (m0 == NULL) { error = ENOBUFS; goto bad; } cp = mtod(m0, u_char *); *cp++ = address; *cp++ = control; *cp++ = protocol >> 8; *cp++ = protocol & 0xff; len = m_length(m0); if (sc->sc_flags & SC_LOG_OUTPKT) { printf("%s output: ", ifp->if_xname); pppdumpm(m0); } if ((protocol & 0x8000) == 0) { #ifdef PPP_FILTER /* * Apply the pass and active filters to the packet, * but only if it is a data packet. */ if (sc->sc_pass_filt_out.bf_insns != 0 && bpf_filter(sc->sc_pass_filt_out.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_out.bf_insns == 0 || bpf_filter(sc->sc_active_filt_out.bf_insns, (u_char *)m0, len, 0)) sc->sc_last_sent = time_second; #else /* * Update the time we sent the most recent packet. */ sc->sc_last_sent = time_second; #endif /* PPP_FILTER */ } /* * See if bpf wants to look at the packet. */ bpf_mtap(&sc->sc_if, m0); /* * Put the packet on the appropriate queue. */ s = splnet(); 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 : NULL; if ((error = ifq_enqueue2(&sc->sc_if, ifq, m0 ALTQ_COMMA ALTQ_DECL(&pktattr))) != 0) { splx(s); sc->sc_if.if_oerrors++; sc->sc_stats.ppp_oerrors++; return (error); } ppp_restart(sc); } 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 splnet, since we muck with the queues. */ static void ppp_requeue(struct ppp_softc *sc) { struct mbuf *m, **mpp; struct ifqueue *ifq; enum NPmode mode; int error; 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; case PPP_IPV6: mode = sc->sc_npmode[NP_IPV6]; 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 : NULL; if ((error = ifq_enqueue2(&sc->sc_if, ifq, m ALTQ_COMMA ALTQ_DECL(NULL))) != 0) { sc->sc_if.if_oerrors++; sc->sc_stats.ppp_oerrors++; } 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; } /* * Transmitter has finished outputting some stuff; * remember to call sc->sc_start later at splsoftnet. */ void ppp_restart(struct ppp_softc *sc) { int s = splhigh(); /* XXX IMP ME HARDER */ sc->sc_flags &= ~SC_TBUSY; softint_schedule(sc->sc_si); splx(s); } /* * Get a packet to send. This procedure is intended to be called at * splsoftnet, since it may involve time-consuming operations such as * applying VJ compression, packet compression, address/control and/or * protocol field compression to the packet. */ struct mbuf * ppp_dequeue(struct ppp_softc *sc) { struct mbuf *m, *mp; u_char *cp; int address, control, protocol; int s; /* * Grab a packet to send: first try the fast queue, then the * normal queue. */ s = splnet(); if (sc->sc_nfastq < sc->sc_maxfastq) { IF_DEQUEUE(&sc->sc_fastq, m); if (m != NULL) sc->sc_nfastq++; else IFQ_DEQUEUE(&sc->sc_if.if_snd, m); } else { sc->sc_nfastq = 0; IFQ_DEQUEUE(&sc->sc_if.if_snd, m); if (m == NULL) { IF_DEQUEUE(&sc->sc_fastq, m); if (m != NULL) sc->sc_nfastq++; } } splx(s); if (m == NULL) return NULL; ++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; slen = 0; for (mp = m; mp != NULL; mp = mp->m_next) slen += mp->m_len; (*sc->sc_xcomp->compress) (sc->sc_xc_state, &mcomp, m, slen, sc->sc_if.if_mtu + PPP_HDRLEN); if (mcomp != NULL) { if (sc->sc_flags & SC_CCP_UP) { /* Send the compressed packet instead of the original. */ m_freem(m); m = mcomp; cp = mtod(m, u_char *); protocol = cp[3]; } else { /* Can't transmit compressed packets until CCP is up. */ m_freem(mcomp); } } } #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; } return m; } /* * Software interrupt routine, called at splsoftnet. */ static void pppintr(void *arg) { struct ppp_softc *sc = arg; struct mbuf *m; int s; mutex_enter(softnet_lock); if (!(sc->sc_flags & SC_TBUSY) && (IFQ_IS_EMPTY(&sc->sc_if.if_snd) == 0 || sc->sc_fastq.ifq_head || sc->sc_outm)) { s = splhigh(); /* XXX IMP ME HARDER */ sc->sc_flags |= SC_TBUSY; splx(s); (*sc->sc_start)(sc); } for (;;) { s = splnet(); IF_DEQUEUE(&sc->sc_rawq, m); splx(s); if (m == NULL) break; ppp_inproc(sc, m); } mutex_exit(softnet_lock); } #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(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 = mtod(mp, u_char *); } 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(); /* XXX IMP ME HARDER */ 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_unit, 0, sc->sc_flags & SC_DEBUG)) { s = splhigh(); /* XXX IMP ME HARDER */ 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_unit, 0, sc->sc_mru, sc->sc_flags & SC_DEBUG)) { s = splhigh(); /* XXX IMP ME HARDER */ 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(); /* XXX IMP ME HARDER */ sc->sc_flags &= ~SC_DC_ERROR; splx(s); } } } break; } } /* * CCP is down; free (de)compressor state if necessary. */ static void ppp_ccp_closed(struct ppp_softc *sc) { if (sc->sc_xc_state) { (*sc->sc_xcomp->comp_free)(sc->sc_xc_state); ppp_compressor_rele(sc->sc_xcomp); sc->sc_xc_state = NULL; } if (sc->sc_rc_state) { (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state); ppp_compressor_rele(sc->sc_rcomp); 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(struct ppp_softc *sc, struct mbuf *m, int lost) { int s = splhigh(); /* XXX IMP ME HARDER */ if (lost) m->m_flags |= M_ERRMARK; IF_ENQUEUE(&sc->sc_rawq, m); softint_schedule(sc->sc_si); 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(struct ppp_softc *sc, struct mbuf *m) { struct ifnet *ifp = &sc->sc_if; struct ifqueue *inq; int s, ilen, proto, rv; u_char *cp, adrs, ctrl; struct mbuf *mp, *dmp = NULL; #ifdef VJC int xlen; u_char *iphdr; u_int hlen; #endif 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("%s: got %d bytes\n", ifp->if_xname, 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(); /* XXX IMP ME HARDER */ 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("%s: decompress failed %d\n", ifp->if_xname, rv); s = splhigh(); /* XXX IMP ME HARDER */ 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(); /* XXX IMP ME HARDER */ 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("%s: VJ uncompress failed on type comp\n", ifp->if_xname); 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("%s: VJ uncompress failed on type uncomp\n", ifp->if_xname); 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, void *)); m_freem(m); m = mp; m->m_len = ilen; } } m->m_pkthdr.len = ilen; m->m_pkthdr.rcvif = ifp; if ((proto & 0x8000) == 0) { #ifdef PPP_FILTER /* * See whether we want to pass this packet, and * if it counts as link activity. */ if (sc->sc_pass_filt_in.bf_insns != 0 && bpf_filter(sc->sc_pass_filt_in.bf_insns, (u_char *)m, ilen, 0) == 0) { /* drop this packet */ m_freem(m); return; } if (sc->sc_active_filt_in.bf_insns == 0 || bpf_filter(sc->sc_active_filt_in.bf_insns, (u_char *)m, ilen, 0)) sc->sc_last_recv = time_second; #else /* * Record the time that we received this packet. */ sc->sc_last_recv = time_second; #endif /* PPP_FILTER */ } /* See if bpf wants to look at the packet. */ bpf_mtap(&sc->sc_if, m); 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; #ifdef GATEWAY if (ipflow_fastforward(m)) return; #endif schednetisr(NETISR_IP); inq = &ipintrq; break; #endif #ifdef INET6 case PPP_IPV6: /* * IPv6 packet - take off the ppp header and pass it up to IPv6. */ if ((ifp->if_flags & IFF_UP) == 0 || sc->sc_npmode[NP_IPV6] != 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; #ifdef GATEWAY if (ip6flow_fastforward(&m)) return; #endif schednetisr(NETISR_IPV6); inq = &ip6intrq; 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 = splnet(); if (IF_QFULL(inq)) { IF_DROP(inq); splx(s); if (sc->sc_flags & SC_DEBUG) printf("%s: input queue full\n", ifp->if_xname); ifp->if_iqdrops++; goto bad; } IF_ENQUEUE(inq, m); splx(s); ifp->if_ipackets++; ifp->if_ibytes += ilen; 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(struct mbuf *m0) { char buf[3*MAX_DUMP_BYTES+4]; char *bp = buf; struct mbuf *m; 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++ = hexdigits[*rptr >> 4]; /* convert byte to ascii hex */ *bp++ = hexdigits[*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); } #ifdef ALTQ /* * a wrapper to transmit a packet from if_start since ALTQ uses * if_start to send a packet. */ static void ppp_ifstart(struct ifnet *ifp) { struct ppp_softc *sc; sc = ifp->if_softc; (*sc->sc_start)(sc); } #endif static const struct ppp_known_compressor { uint8_t code; const char *module; } ppp_known_compressors[] = { { CI_DEFLATE, "ppp_deflate" }, { CI_DEFLATE_DRAFT, "ppp_deflate" }, { CI_BSD_COMPRESS, "ppp_bsdcomp" }, { CI_MPPE, "ppp_mppe" }, { 0, NULL } }; static int ppp_compressor_init(void) { mutex_init(&ppp_compressors_mtx, MUTEX_DEFAULT, IPL_NONE); return 0; } static void ppp_compressor_rele(struct compressor *cp) { mutex_enter(&ppp_compressors_mtx); --cp->comp_refcnt; mutex_exit(&ppp_compressors_mtx); } static struct compressor * ppp_get_compressor_noload(uint8_t ci, bool hold) { struct compressor *cp; KASSERT(mutex_owned(&ppp_compressors_mtx)); LIST_FOREACH(cp, &ppp_compressors, comp_list) { if (cp->compress_proto == ci) { if (hold) ++cp->comp_refcnt; return cp; } } return NULL; } static struct compressor * ppp_get_compressor(uint8_t ci) { struct compressor *cp = NULL; const struct ppp_known_compressor *pkc; mutex_enter(&ppp_compressors_mtx); cp = ppp_get_compressor_noload(ci, true); mutex_exit(&ppp_compressors_mtx); if (cp != NULL) return cp; kernconfig_lock(); mutex_enter(&ppp_compressors_mtx); cp = ppp_get_compressor_noload(ci, true); mutex_exit(&ppp_compressors_mtx); if (cp == NULL) { /* Not found, so try to autoload a module */ for (pkc = ppp_known_compressors; pkc->module != NULL; pkc++) { if (pkc->code == ci) { if (module_autoload(pkc->module, MODULE_CLASS_MISC) != 0) break; mutex_enter(&ppp_compressors_mtx); cp = ppp_get_compressor_noload(ci, true); mutex_exit(&ppp_compressors_mtx); break; } } } kernconfig_unlock(); return cp; } int ppp_register_compressor(struct compressor *pc, size_t ncomp) { int error = 0; size_t i; RUN_ONCE(&ppp_compressor_mtx_init, ppp_compressor_init); mutex_enter(&ppp_compressors_mtx); for (i = 0; i < ncomp; i++) { if (ppp_get_compressor_noload(pc[i].compress_proto, false) != NULL) error = EEXIST; } if (!error) { for (i = 0; i < ncomp; i++) { pc[i].comp_refcnt = 0; LIST_INSERT_HEAD(&ppp_compressors, &pc[i], comp_list); } } mutex_exit(&ppp_compressors_mtx); return error; } int ppp_unregister_compressor(struct compressor *pc, size_t ncomp) { int error = 0; size_t i; mutex_enter(&ppp_compressors_mtx); for (i = 0; i < ncomp; i++) { if (ppp_get_compressor_noload(pc[i].compress_proto, false) != &pc[i]) error = ENOENT; else if (pc[i].comp_refcnt != 0) error = EBUSY; } if (!error) { for (i = 0; i < ncomp; i++) { LIST_REMOVE(&pc[i], comp_list); } } mutex_exit(&ppp_compressors_mtx); return error; }