From 0e3cde3c8778256b8830c9314cf0d954330fba68 Mon Sep 17 00:00:00 2001 From: Paul Mackerras Date: Wed, 30 Apr 1997 05:42:08 +0000 Subject: [PATCH] optionally include filtering stuff --- freebsd-2.0/if_ppp.c | 110 +++++++++++++++++++++++++++++++++++++--- freebsd-2.0/if_pppvar.h | 6 ++- freebsd-2.0/ppp_tty.c | 5 +- 3 files changed, 112 insertions(+), 9 deletions(-) diff --git a/freebsd-2.0/if_ppp.c b/freebsd-2.0/if_ppp.c index 6e450ea..d9369d6 100644 --- a/freebsd-2.0/if_ppp.c +++ b/freebsd-2.0/if_ppp.c @@ -69,7 +69,7 @@ * Paul Mackerras (paulus@cs.anu.edu.au). */ -/* $Id: if_ppp.c,v 1.11 1997/03/04 03:27:28 paulus Exp $ */ +/* $Id: if_ppp.c,v 1.12 1997/04/30 05:42:07 paulus Exp $ */ /* 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 */ @@ -93,6 +93,9 @@ #include #include #include +#ifdef PPP_FILTER +#include +#endif #if INET #include @@ -131,7 +134,6 @@ static int pppsioctl __P((struct ifnet *, int, caddr_t)); static int pppoutput __P((struct ifnet *, struct mbuf *, struct sockaddr *, struct rtentry *)); static void ppp_requeue __P((struct ppp_softc *)); -static void ppp_outpkt __P((struct ppp_softc *)); static void ppp_ccp __P((struct ppp_softc *, struct mbuf *m, int rcvd)); static void ppp_ccp_closed __P((struct ppp_softc *)); static void ppp_inproc __P((struct ppp_softc *, struct mbuf *)); @@ -299,6 +301,18 @@ pppdealloc(sc) sc->sc_xc_state = NULL; sc->sc_rc_state = NULL; #endif /* PPP_COMPRESS */ +#ifdef PPP_FILTER + if (sc->sc_pass_filt.bf_insns != 0) { + FREE(sc->sc_pass_filt.bf_insns, M_DEVBUF); + sc->sc_pass_filt.bf_insns = 0; + sc->sc_pass_filt.bf_len = 0; + } + if (sc->sc_active_filt.bf_insns != 0) { + FREE(sc->sc_active_filt.bf_insns, M_DEVBUF); + sc->sc_active_filt.bf_insns = 0; + sc->sc_active_filt.bf_len = 0; + } +#endif /* PPP_FILTER */ #ifdef VJC if (sc->sc_comp != 0) { FREE(sc->sc_comp, M_DEVBUF); @@ -323,6 +337,11 @@ pppioctl(sc, cmd, data, flag, p) 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 @@ -478,6 +497,40 @@ pppioctl(sc, cmd, data, flag, p) 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 (-1); } @@ -487,7 +540,7 @@ pppioctl(sc, cmd, data, flag, p) /* * Process an ioctl request to the ppp network interface. */ -int +static int pppsioctl(ifp, cmd, data) register struct ifnet *ifp; int cmd; @@ -685,10 +738,33 @@ pppoutput(ifp, m0, dst, rtp) } 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.tv_sec; + + *mtod(m0, u_char *) = address; +#else /* * Update the time we sent the most recent data packet. */ sc->sc_last_sent = time.tv_sec; +#endif /* PPP_FILTER */ } #if NBPFILTER > 0 @@ -813,7 +889,6 @@ ppp_dequeue(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 @@ -1298,11 +1373,32 @@ ppp_inproc(sc, m) m->m_pkthdr.len = ilen; m->m_pkthdr.rcvif = ifp; - /* - * Record the time that we received this packet. - */ 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.tv_sec; + + *mtod(m, u_char *) = adrs; +#else + /* + * Record the time that we received this packet. + */ sc->sc_last_recv = time.tv_sec; +#endif /* PPP_FILTER */ } #if NBPFILTER > 0 diff --git a/freebsd-2.0/if_pppvar.h b/freebsd-2.0/if_pppvar.h index e91e889..91e8e4e 100644 --- a/freebsd-2.0/if_pppvar.h +++ b/freebsd-2.0/if_pppvar.h @@ -1,4 +1,4 @@ -/* $Id: if_pppvar.h,v 1.4 1997/03/04 03:27:28 paulus Exp $ */ +/* $Id: if_pppvar.h,v 1.5 1997/04/30 05:42:08 paulus Exp $ */ /* * if_pppvar.h - private structures and declarations for PPP. * @@ -75,6 +75,10 @@ struct ppp_softc { void *sc_rc_state; /* receive decompressor state */ time_t sc_last_sent; /* time (secs) last NP pkt sent */ time_t sc_last_recv; /* time (secs) last NP pkt rcvd */ +#ifdef PPP_FILTER + struct bpf_program sc_pass_filt; /* filter for packets to pass */ + struct bpf_program sc_active_filt; /* filter for "non-idle" packets */ +#endif /* PPP_FILTER */ #ifdef VJC struct vjcompress *sc_comp; /* vjc control buffer */ #endif diff --git a/freebsd-2.0/ppp_tty.c b/freebsd-2.0/ppp_tty.c index f06c4d7..912f083 100644 --- a/freebsd-2.0/ppp_tty.c +++ b/freebsd-2.0/ppp_tty.c @@ -70,7 +70,7 @@ * Paul Mackerras (paulus@cs.anu.edu.au). */ -/* $Id: ppp_tty.c,v 1.7 1997/03/04 03:27:28 paulus Exp $ */ +/* $Id: ppp_tty.c,v 1.8 1997/04/30 05:42:08 paulus Exp $ */ /* 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 */ @@ -103,6 +103,9 @@ #include #endif +#ifdef PPP_FILTER +#include +#endif #include #include #include -- 2.39.2