diff options
Diffstat (limited to 'usr.sbin/ppp/acf.c')
-rw-r--r-- | usr.sbin/ppp/acf.c | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/usr.sbin/ppp/acf.c b/usr.sbin/ppp/acf.c new file mode 100644 index 0000000..2839ca2 --- /dev/null +++ b/usr.sbin/ppp/acf.c @@ -0,0 +1,111 @@ +/*- + * Copyright (c) 1999 Brian Somers <brian@Awfulhak.org> + * 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. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * $Id:$ + */ + +#include <sys/types.h> + +#include <stdio.h> +#include <termios.h> + +#include "defs.h" +#include "layer.h" +#include "timer.h" +#include "fsm.h" +#include "log.h" +#include "mbuf.h" +#include "acf.h" +#include "proto.h" +#include "lcp.h" +#include "throughput.h" +#include "lqr.h" +#include "hdlc.h" +#include "ccp.h" +#include "link.h" +#include "descriptor.h" +#include "async.h" +#include "physical.h" + +int +acf_WrapperOctets(struct lcp *lcp, u_short proto) +{ + return (proto == PROTO_LCP || lcp->his_acfcomp == 0) ? 2 : 0; +} + +static struct mbuf * +acf_LayerPush(struct bundle *b, struct link *l, struct mbuf *bp, + int pri, u_short *proto) +{ + const u_char cp[2] = { HDLC_ADDR, HDLC_UI }; + + if (*proto == PROTO_LCP || l->lcp.his_acfcomp == 0) + bp = mbuf_Prepend(bp, cp, 2, 0); + + return bp; +} + +static struct mbuf * +acf_LayerPull(struct bundle *b, struct link *l, struct mbuf *bp, u_short *proto) +{ + struct physical *p = link2physical(l); + u_char cp[2]; + + if (!p) { + log_Printf(LogERROR, "Can't Pull an acf packet from a logical link\n"); + return bp; + } + + if (mbuf_View(bp, cp, 2) == 2) { + if (!p->link.lcp.want_acfcomp) { + /* We expect the packet not to be compressed */ + bp = mbuf_Read(bp, cp, 2); + if (cp[0] != HDLC_ADDR) { + p->hdlc.lqm.SaveInErrors++; + p->hdlc.stats.badaddr++; + log_Printf(LogDEBUG, "acf_LayerPull: addr 0x%02x\n", cp[0]); + mbuf_Free(bp); + return NULL; + } + if (cp[1] != HDLC_UI) { + p->hdlc.lqm.SaveInErrors++; + p->hdlc.stats.badcommand++; + log_Printf(LogDEBUG, "acf_LayerPull: control 0x%02x\n", cp[1]); + mbuf_Free(bp); + return NULL; + } + } else if (cp[0] == HDLC_ADDR && cp[1] == HDLC_UI) { + /* + * We can receive compressed packets, but the peer still sends + * uncompressed packets (or maybe this is a PROTO_LCP packet) ! + */ + bp = mbuf_Read(bp, cp, 2); + } + } + + return bp; +} + +struct layer acflayer = { LAYER_ACF, "acf", acf_LayerPush, acf_LayerPull }; |