1591 lines
37 KiB
C
1591 lines
37 KiB
C
/*
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* if_ppp.c - Point-to-Point Protocol (PPP) Asynchronous driver.
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*
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* Copyright (c) 1989 Carnegie Mellon University.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that the above copyright notice and this paragraph are
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* duplicated in all such forms and that any documentation,
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* advertising materials, and other materials related to such
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* distribution and use acknowledge that the software was developed
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* by Carnegie Mellon University. The name of the
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* University may not be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*
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* Drew D. Perkins
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* Carnegie Mellon University
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* 4910 Forbes Ave.
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* Pittsburgh, PA 15213
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* (412) 268-8576
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* ddp@andrew.cmu.edu
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*
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* Based on:
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* @(#)if_sl.c 7.6.1.2 (Berkeley) 2/15/89
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*
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* Copyright (c) 1987 Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that the above copyright notice and this paragraph are
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* duplicated in all such forms and that any documentation,
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* advertising materials, and other materials related to such
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* distribution and use acknowledge that the software was developed
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* by the University of California, Berkeley. The name of the
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* University may not be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*
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* Serial Line interface
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*
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* Rick Adams
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* Center for Seismic Studies
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* 1300 N 17th Street, Suite 1450
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* Arlington, Virginia 22209
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* (703)276-7900
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* rick@seismo.ARPA
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* seismo!rick
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*
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* Pounded on heavily by Chris Torek (chris@mimsy.umd.edu, umcp-cs!chris).
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* Converted to 4.3BSD Beta by Chris Torek.
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* Other changes made at Berkeley, based in part on code by Kirk Smith.
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*
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* Converted to 4.3BSD+ 386BSD by Brad Parker (brad@cayman.com)
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* Added VJ tcp header compression; more unified ioctls
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*
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* Extensively modified by Paul Mackerras (paulus@cs.anu.edu.au).
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* Cleaned up a lot of the mbuf-related code to fix bugs that
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* caused system crashes and packet corruption. Changed pppstart
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* so that it doesn't just give up with a collision if the whole
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* packet doesn't fit in the output ring buffer.
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*
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* Added priority queueing for interactive IP packets, following
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* the model of if_sl.c, plus hooks for bpf.
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* Paul Mackerras (paulus@cs.anu.edu.au).
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*/
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/* $Id: if_ppp.c,v 1.58 1998/06/07 17:12:03 dfr Exp $ */
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/* from if_sl.c,v 1.11 84/10/04 12:54:47 rick Exp */
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/* from NetBSD: if_ppp.c,v 1.15.2.2 1994/07/28 05:17:58 cgd Exp */
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#include "ppp.h"
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#if NPPP > 0
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#include "opt_inet.h"
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#include "opt_ipx.h"
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#include "opt_ppp.h"
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#ifdef INET
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#define VJC
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#endif
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#define PPP_COMPRESS
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/proc.h>
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#include <sys/filio.h>
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#include <sys/sockio.h>
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#include <sys/kernel.h>
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#include <sys/time.h>
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#include <sys/malloc.h>
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#include <net/if.h>
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#include <net/if_types.h>
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#include <net/netisr.h>
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#if INET
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/in_var.h>
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#include <netinet/ip.h>
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#endif
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#if IPX
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#include <netipx/ipx.h>
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#include <netipx/ipx_if.h>
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#endif
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#include "bpfilter.h"
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#if NBPFILTER > 0
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#include <net/bpf.h>
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#endif
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#if defined(PPP_FILTER) && NBPFILTER == 0
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#error "PPP_FILTER requires bpf"
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#endif
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#ifdef VJC
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#include <net/slcompress.h>
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#endif
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#include <net/if_ppp.h>
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#include <net/if_pppvar.h>
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/* minimise diffs */
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#ifndef splsoftnet
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#define splsoftnet splnet
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#endif
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#ifdef PPP_COMPRESS
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#define PACKETPTR struct mbuf *
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#include <net/ppp_comp.h>
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#endif
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struct ppp_softc ppp_softc[NPPP];
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/* XXX layering violation */
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extern void pppasyncattach __P((void *));
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static void pppattach __P((void *));
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PSEUDO_SET(pppattach, if_ppp);
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static int pppsioctl __P((struct ifnet *ifp, u_long cmd, caddr_t data));
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static void pppintr __P((void));
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static void ppp_requeue __P((struct ppp_softc *));
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static void ppp_ccp __P((struct ppp_softc *, struct mbuf *m, int rcvd));
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static void ppp_ccp_closed __P((struct ppp_softc *));
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static void ppp_inproc __P((struct ppp_softc *, struct mbuf *));
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static void pppdumpm __P((struct mbuf *m0));
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/*
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* Some useful mbuf macros not in mbuf.h.
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*/
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#define M_IS_CLUSTER(m) ((m)->m_flags & M_EXT)
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#define M_DATASTART(m) \
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(M_IS_CLUSTER(m) ? (m)->m_ext.ext_buf : \
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(m)->m_flags & M_PKTHDR ? (m)->m_pktdat : (m)->m_dat)
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#define M_DATASIZE(m) \
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(M_IS_CLUSTER(m) ? (m)->m_ext.ext_size : \
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(m)->m_flags & M_PKTHDR ? MHLEN: MLEN)
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/*
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* We steal two bits in the mbuf m_flags, to mark high-priority packets
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* for output, and received packets following lost/corrupted packets.
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*/
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#define M_HIGHPRI 0x2000 /* output packet for sc_fastq */
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#define M_ERRMARK 0x4000 /* steal a bit in mbuf m_flags */
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#ifdef PPP_COMPRESS
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/*
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* List of compressors we know about.
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* We leave some space so maybe we can modload compressors.
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*/
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extern struct compressor ppp_bsd_compress;
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extern struct compressor ppp_deflate, ppp_deflate_draft;
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static struct compressor *ppp_compressors[8] = {
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#if DO_BSD_COMPRESS && defined(PPP_BSDCOMP)
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&ppp_bsd_compress,
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#endif
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#if DO_DEFLATE && defined(PPP_DEFLATE)
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&ppp_deflate,
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&ppp_deflate_draft,
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#endif
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NULL
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};
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#endif /* PPP_COMPRESS */
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/*
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* Called from boot code to establish ppp interfaces.
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*/
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static void
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pppattach(dummy)
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void *dummy;
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{
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register struct ppp_softc *sc;
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register int i = 0;
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for (sc = ppp_softc; i < NPPP; sc++) {
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sc->sc_if.if_name = "ppp";
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sc->sc_if.if_unit = i++;
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sc->sc_if.if_mtu = PPP_MTU;
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sc->sc_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST;
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sc->sc_if.if_type = IFT_PPP;
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sc->sc_if.if_hdrlen = PPP_HDRLEN;
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sc->sc_if.if_ioctl = pppsioctl;
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sc->sc_if.if_output = pppoutput;
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sc->sc_if.if_snd.ifq_maxlen = IFQ_MAXLEN;
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sc->sc_inq.ifq_maxlen = IFQ_MAXLEN;
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sc->sc_fastq.ifq_maxlen = IFQ_MAXLEN;
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sc->sc_rawq.ifq_maxlen = IFQ_MAXLEN;
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if_attach(&sc->sc_if);
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#if NBPFILTER > 0
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bpfattach(&sc->sc_if, DLT_PPP, PPP_HDRLEN);
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#endif
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}
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register_netisr(NETISR_PPP, pppintr);
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/*
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* XXX layering violation - if_ppp can work over any lower level
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* transport that cares to attach to it.
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*/
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pppasyncattach(dummy);
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}
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/*
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* Allocate a ppp interface unit and initialize it.
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*/
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struct ppp_softc *
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pppalloc(pid)
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pid_t pid;
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{
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int nppp, i;
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struct ppp_softc *sc;
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for (nppp = 0, sc = ppp_softc; nppp < NPPP; nppp++, sc++)
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if (sc->sc_xfer == pid) {
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sc->sc_xfer = 0;
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return sc;
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}
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for (nppp = 0, sc = ppp_softc; nppp < NPPP; nppp++, sc++)
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if (sc->sc_devp == NULL)
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break;
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if (nppp >= NPPP)
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return NULL;
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sc->sc_flags = 0;
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sc->sc_mru = PPP_MRU;
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sc->sc_relinq = NULL;
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bzero((char *)&sc->sc_stats, sizeof(sc->sc_stats));
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#ifdef VJC
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MALLOC(sc->sc_comp, struct slcompress *, sizeof(struct slcompress),
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M_DEVBUF, M_NOWAIT);
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if (sc->sc_comp)
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sl_compress_init(sc->sc_comp, -1);
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#endif
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#ifdef PPP_COMPRESS
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sc->sc_xc_state = NULL;
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sc->sc_rc_state = NULL;
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#endif /* PPP_COMPRESS */
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for (i = 0; i < NUM_NP; ++i)
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sc->sc_npmode[i] = NPMODE_ERROR;
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sc->sc_npqueue = NULL;
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sc->sc_npqtail = &sc->sc_npqueue;
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sc->sc_last_sent = sc->sc_last_recv = time_second;
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return sc;
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}
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/*
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* Deallocate a ppp unit. Must be called at splsoftnet or higher.
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*/
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void
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pppdealloc(sc)
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struct ppp_softc *sc;
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{
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struct mbuf *m;
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if_down(&sc->sc_if);
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sc->sc_if.if_flags &= ~(IFF_UP|IFF_RUNNING);
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getmicrotime(&sc->sc_if.if_lastchange);
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sc->sc_devp = NULL;
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sc->sc_xfer = 0;
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for (;;) {
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IF_DEQUEUE(&sc->sc_rawq, m);
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if (m == NULL)
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break;
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m_freem(m);
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}
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for (;;) {
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IF_DEQUEUE(&sc->sc_inq, m);
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if (m == NULL)
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break;
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m_freem(m);
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}
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for (;;) {
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IF_DEQUEUE(&sc->sc_fastq, m);
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if (m == NULL)
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break;
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m_freem(m);
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}
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while ((m = sc->sc_npqueue) != NULL) {
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sc->sc_npqueue = m->m_nextpkt;
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m_freem(m);
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}
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#ifdef PPP_COMPRESS
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ppp_ccp_closed(sc);
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sc->sc_xc_state = NULL;
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sc->sc_rc_state = NULL;
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#endif /* PPP_COMPRESS */
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#ifdef PPP_FILTER
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if (sc->sc_pass_filt.bf_insns != 0) {
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FREE(sc->sc_pass_filt.bf_insns, M_DEVBUF);
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sc->sc_pass_filt.bf_insns = 0;
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sc->sc_pass_filt.bf_len = 0;
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}
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if (sc->sc_active_filt.bf_insns != 0) {
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FREE(sc->sc_active_filt.bf_insns, M_DEVBUF);
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sc->sc_active_filt.bf_insns = 0;
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sc->sc_active_filt.bf_len = 0;
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}
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#endif /* PPP_FILTER */
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#ifdef VJC
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if (sc->sc_comp != 0) {
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FREE(sc->sc_comp, M_DEVBUF);
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sc->sc_comp = 0;
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}
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#endif
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}
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/*
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* Ioctl routine for generic ppp devices.
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*/
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int
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pppioctl(sc, cmd, data, flag, p)
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struct ppp_softc *sc;
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u_long cmd;
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caddr_t data;
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int flag;
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struct proc *p;
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{
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int s, error, flags, mru, nb, npx;
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struct ppp_option_data *odp;
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struct compressor **cp;
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struct npioctl *npi;
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time_t t;
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#ifdef PPP_FILTER
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struct bpf_program *bp, *nbp;
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struct bpf_insn *newcode, *oldcode;
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int newcodelen;
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#endif /* PPP_FILTER */
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#ifdef PPP_COMPRESS
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u_char ccp_option[CCP_MAX_OPTION_LENGTH];
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#endif
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switch (cmd) {
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case FIONREAD:
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*(int *)data = sc->sc_inq.ifq_len;
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break;
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case PPPIOCGUNIT:
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*(int *)data = sc->sc_if.if_unit;
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break;
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case PPPIOCGFLAGS:
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*(u_int *)data = sc->sc_flags;
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break;
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case PPPIOCSFLAGS:
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if ((error = suser(p->p_ucred, &p->p_acflag)) != 0)
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return (error);
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flags = *(int *)data & SC_MASK;
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s = splsoftnet();
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#ifdef PPP_COMPRESS
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if (sc->sc_flags & SC_CCP_OPEN && !(flags & SC_CCP_OPEN))
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ppp_ccp_closed(sc);
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#endif
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splimp();
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sc->sc_flags = (sc->sc_flags & ~SC_MASK) | flags;
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splx(s);
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break;
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case PPPIOCSMRU:
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if ((error = suser(p->p_ucred, &p->p_acflag)) != 0)
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return (error);
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mru = *(int *)data;
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if (mru >= PPP_MRU && mru <= PPP_MAXMRU)
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sc->sc_mru = mru;
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break;
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case PPPIOCGMRU:
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*(int *)data = sc->sc_mru;
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break;
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#ifdef VJC
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case PPPIOCSMAXCID:
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if ((error = suser(p->p_ucred, &p->p_acflag)) != 0)
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return (error);
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if (sc->sc_comp) {
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s = splsoftnet();
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sl_compress_init(sc->sc_comp, *(int *)data);
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splx(s);
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}
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break;
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#endif
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case PPPIOCXFERUNIT:
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if ((error = suser(p->p_ucred, &p->p_acflag)) != 0)
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return (error);
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sc->sc_xfer = p->p_pid;
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break;
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#ifdef PPP_COMPRESS
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case PPPIOCSCOMPRESS:
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if ((error = suser(p->p_ucred, &p->p_acflag)) != 0)
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return (error);
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odp = (struct ppp_option_data *) data;
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nb = odp->length;
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if (nb > sizeof(ccp_option))
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nb = sizeof(ccp_option);
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if ((error = copyin(odp->ptr, ccp_option, nb)) != 0)
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return (error);
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if (ccp_option[1] < 2) /* preliminary check on the length byte */
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return (EINVAL);
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for (cp = ppp_compressors; *cp != NULL; ++cp)
|
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if ((*cp)->compress_proto == ccp_option[0]) {
|
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/*
|
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* Found a handler for the protocol - try to allocate
|
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* a compressor or decompressor.
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*/
|
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error = 0;
|
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if (odp->transmit) {
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s = splsoftnet();
|
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if (sc->sc_xc_state != NULL)
|
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(*sc->sc_xcomp->comp_free)(sc->sc_xc_state);
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sc->sc_xcomp = *cp;
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sc->sc_xc_state = (*cp)->comp_alloc(ccp_option, nb);
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if (sc->sc_xc_state == NULL) {
|
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if (sc->sc_flags & SC_DEBUG)
|
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printf("ppp%d: comp_alloc failed\n",
|
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sc->sc_if.if_unit);
|
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error = ENOBUFS;
|
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}
|
|
splimp();
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sc->sc_flags &= ~SC_COMP_RUN;
|
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splx(s);
|
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} else {
|
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s = splsoftnet();
|
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if (sc->sc_rc_state != NULL)
|
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(*sc->sc_rcomp->decomp_free)(sc->sc_rc_state);
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sc->sc_rcomp = *cp;
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sc->sc_rc_state = (*cp)->decomp_alloc(ccp_option, nb);
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if (sc->sc_rc_state == NULL) {
|
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if (sc->sc_flags & SC_DEBUG)
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printf("ppp%d: decomp_alloc failed\n",
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sc->sc_if.if_unit);
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error = ENOBUFS;
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}
|
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splimp();
|
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sc->sc_flags &= ~SC_DECOMP_RUN;
|
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splx(s);
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}
|
|
return (error);
|
|
}
|
|
if (sc->sc_flags & SC_DEBUG)
|
|
printf("ppp%d: no compressor for [%x %x %x], %x\n",
|
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sc->sc_if.if_unit, ccp_option[0], ccp_option[1],
|
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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_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:
|
|
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;
|
|
#endif
|
|
|
|
default:
|
|
return (ENOIOCTL);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Process an ioctl request to the ppp network interface.
|
|
*/
|
|
static 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:
|
|
case SIOCAIFADDR:
|
|
switch(ifa->ifa_addr->sa_family) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
break;
|
|
#endif
|
|
#ifdef IPX
|
|
case AF_IPX:
|
|
break;
|
|
#endif
|
|
default:
|
|
error = EAFNOSUPPORT;
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case SIOCSIFDSTADDR:
|
|
switch(ifa->ifa_addr->sa_family) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
break;
|
|
#endif
|
|
#ifdef IPX
|
|
case AF_IPX:
|
|
break;
|
|
#endif
|
|
default:
|
|
error = EAFNOSUPPORT;
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case SIOCSIFMTU:
|
|
if ((error = suser(p->p_ucred, &p->p_acflag)) != 0)
|
|
break;
|
|
if (ifr->ifr_mtu > PPP_MAXMTU)
|
|
error = EINVAL;
|
|
else {
|
|
sc->sc_if.if_mtu = ifr->ifr_mtu;
|
|
if (sc->sc_setmtu)
|
|
(*sc->sc_setmtu)(sc);
|
|
}
|
|
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 = ENOTTY;
|
|
}
|
|
splx(s);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Queue a packet. Start transmission if not active.
|
|
* Packet is placed in Information field of PPP frame.
|
|
* Called at splnet as the if->if_output handler.
|
|
* Called at splnet from pppwrite().
|
|
*/
|
|
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 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
|
|
#ifdef IPX
|
|
case AF_IPX:
|
|
/*
|
|
* This is pretty bogus.. We dont have an ipxcp module in pppd
|
|
* yet to configure the link parameters. Sigh. I guess a
|
|
* manual ifconfig would do.... -Peter
|
|
*/
|
|
address = PPP_ALLSTATIONS;
|
|
control = PPP_UI;
|
|
protocol = PPP_IPX;
|
|
mode = NPMODE_PASS;
|
|
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);
|
|
}
|
|
|
|
if ((protocol & 0x8000) == 0) {
|
|
#ifdef PPP_FILTER
|
|
/*
|
|
* Apply the pass and active filters to the packet,
|
|
* but only if it is a data packet.
|
|
*/
|
|
*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_second;
|
|
|
|
*mtod(m0, u_char *) = address;
|
|
#else
|
|
/*
|
|
* Update the time we sent the most recent data packet.
|
|
*/
|
|
sc->sc_last_sent = time_second;
|
|
#endif /* PPP_FILTER */
|
|
}
|
|
|
|
#if NBPFILTER > 0
|
|
/*
|
|
* See if bpf wants to look at the packet.
|
|
*/
|
|
if (ifp->if_bpf)
|
|
bpf_mtap(ifp, m0);
|
|
#endif
|
|
|
|
/*
|
|
* Put the packet on the appropriate queue.
|
|
*/
|
|
s = splsoftnet(); /* redundant */
|
|
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 {
|
|
/* fastq and if_snd are emptied at spl[soft]net now */
|
|
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);
|
|
}
|
|
getmicrotime(&ifp->if_lastchange);
|
|
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 spl[soft]net.
|
|
*/
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* Transmitter has finished outputting some stuff;
|
|
* remember to call sc->sc_start later at splsoftnet.
|
|
*/
|
|
void
|
|
ppp_restart(sc)
|
|
struct ppp_softc *sc;
|
|
{
|
|
int s = splimp();
|
|
|
|
sc->sc_flags &= ~SC_TBUSY;
|
|
schednetisr(NETISR_PPP);
|
|
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(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 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, 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_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 spl[soft]net.
|
|
*/
|
|
static void
|
|
pppintr()
|
|
{
|
|
struct ppp_softc *sc;
|
|
int i, s;
|
|
struct mbuf *m;
|
|
|
|
sc = ppp_softc;
|
|
for (i = 0; i < NPPP; ++i, ++sc) {
|
|
s = splimp();
|
|
if (!(sc->sc_flags & SC_TBUSY)
|
|
&& (sc->sc_if.if_snd.ifq_head || sc->sc_fastq.ifq_head)) {
|
|
sc->sc_flags |= SC_TBUSY;
|
|
splx(s);
|
|
(*sc->sc_start)(sc);
|
|
} else
|
|
splx(s);
|
|
for (;;) {
|
|
s = splimp();
|
|
IF_DEQUEUE(&sc->sc_rawq, m);
|
|
splx(s);
|
|
if (m == NULL)
|
|
break;
|
|
ppp_inproc(sc, m);
|
|
}
|
|
}
|
|
}
|
|
|
|
#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 = splimp();
|
|
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 = splimp();
|
|
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 = splimp();
|
|
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 = splimp();
|
|
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 = splimp();
|
|
|
|
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 = 0, 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 = splimp();
|
|
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 = splimp();
|
|
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 = splimp();
|
|
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;
|
|
|
|
if ((proto & 0x8000) == 0) {
|
|
#ifdef PPP_FILTER
|
|
/*
|
|
* See whether we want to pass this packet, and
|
|
* if it counts as link activity.
|
|
*/
|
|
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_second;
|
|
|
|
*mtod(m, u_char *) = adrs;
|
|
#else
|
|
/*
|
|
* Record the time that we received this packet.
|
|
*/
|
|
sc->sc_last_recv = time_second;
|
|
#endif /* PPP_FILTER */
|
|
}
|
|
|
|
#if NBPFILTER > 0
|
|
/* See if bpf wants to look at the packet. */
|
|
if (sc->sc_if.if_bpf)
|
|
bpf_mtap(&sc->sc_if, 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;
|
|
if (ipflow_fastforward(m)) {
|
|
sc->sc_last_recv = time_second;
|
|
return;
|
|
}
|
|
schednetisr(NETISR_IP);
|
|
inq = &ipintrq;
|
|
sc->sc_last_recv = time_second; /* update time of last pkt rcvd */
|
|
break;
|
|
#endif
|
|
#ifdef IPX
|
|
case PPP_IPX:
|
|
/*
|
|
* IPX packet - take off the ppp header and pass it up to IPX.
|
|
*/
|
|
if ((sc->sc_if.if_flags & IFF_UP) == 0
|
|
/* XXX: || sc->sc_npmode[NP_IPX] != 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_IPX);
|
|
inq = &ipxintrq;
|
|
sc->sc_last_recv = time_second; /* update time of last pkt rcvd */
|
|
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 = splimp();
|
|
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;
|
|
getmicrotime(&ifp->if_lastchange);
|
|
|
|
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;
|
|
|
|
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++ = hex2ascii(*rptr >> 4);
|
|
*bp++ = hex2ascii(*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 */
|