mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
synced 2024-12-05 06:04:04 +02:00
1885 lines
61 KiB
Diff
1885 lines
61 KiB
Diff
|
diff -ruN linux-2.4.21.orig/drivers/net/Config.in linux-2.4.21/drivers/net/Config.in
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|||
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--- linux-2.4.21.orig/drivers/net/Config.in 2003-06-13 16:51:34.000000000 +0200
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+++ linux-2.4.21/drivers/net/Config.in 2003-07-08 07:27:10.000000000 +0200
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@@ -301,6 +301,7 @@
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dep_tristate ' PPP support for sync tty ports' CONFIG_PPP_SYNC_TTY $CONFIG_PPP
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dep_tristate ' PPP Deflate compression' CONFIG_PPP_DEFLATE $CONFIG_PPP
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dep_tristate ' PPP BSD-Compress compression' CONFIG_PPP_BSDCOMP $CONFIG_PPP
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+ dep_tristate ' Microsoft PPP compression/encryption (MPPC/MPPE)' CONFIG_PPP_MPPE $CONFIG_PPP
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if [ "$CONFIG_EXPERIMENTAL" = "y" ]; then
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dep_tristate ' PPP over Ethernet (EXPERIMENTAL)' CONFIG_PPPOE $CONFIG_PPP
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fi
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diff -ruN linux-2.4.21.orig/drivers/net/Makefile linux-2.4.21/drivers/net/Makefile
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--- linux-2.4.21.orig/drivers/net/Makefile 2003-06-13 16:51:34.000000000 +0200
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+++ linux-2.4.21/drivers/net/Makefile 2003-07-14 23:53:15.000000000 +0200
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@@ -18,8 +18,9 @@
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export-objs := 8390.o arlan.o aironet4500_core.o aironet4500_card.o \
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ppp_async.o ppp_generic.o slhc.o pppox.o auto_irq.o \
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net_init.o mii.o
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-list-multi := rcpci.o
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+list-multi := rcpci.o ppp_mppe_mppc.o
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rcpci-objs := rcpci45.o rclanmtl.o
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+ppp_mppe_c-objs := ppp_mppe_mppc_comp.o ppp_mppe_crypto.o
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ifeq ($(CONFIG_TULIP),y)
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obj-y += tulip/tulip.o
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@@ -149,6 +150,15 @@
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obj-$(CONFIG_PPP_SYNC_TTY) += ppp_synctty.o
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obj-$(CONFIG_PPP_DEFLATE) += ppp_deflate.o
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obj-$(CONFIG_PPP_BSDCOMP) += bsd_comp.o
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+
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+ifeq ($(CONFIG_PPP_MPPE),y)
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+ obj-y += $(ppp_mppe_c-objs)
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+else
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+ ifeq ($(CONFIG_PPP_MPPE),m)
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+ obj-m += ppp_mppe_mppc.o
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+ endif
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+endif
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+
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obj-$(CONFIG_PPPOE) += pppox.o pppoe.o
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obj-$(CONFIG_SLIP) += slip.o
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@@ -258,3 +268,5 @@
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rcpci.o: $(rcpci-objs)
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$(LD) -r -o $@ $(rcpci-objs)
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+ppp_mppe_mppc.o: $(ppp_mppe_c-objs)
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+ $(LD) -r -o $@ $(ppp_mppe_c-objs)
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diff -ruN linux-2.4.21.orig/drivers/net/ppp_generic.c linux-2.4.21/drivers/net/ppp_generic.c
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--- linux-2.4.21.orig/drivers/net/ppp_generic.c 2003-06-13 16:51:35.000000000 +0200
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+++ linux-2.4.21/drivers/net/ppp_generic.c 2003-07-12 04:39:03.000000000 +0200
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@@ -19,7 +19,7 @@
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* PPP driver, written by Michael Callahan and Al Longyear, and
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* subsequently hacked by Paul Mackerras.
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*
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- * ==FILEVERSION 20020217==
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+ * ==FILEVERSION 20030706==
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*/
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#include <linux/config.h>
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@@ -102,6 +102,7 @@
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spinlock_t rlock; /* lock for receive side 58 */
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spinlock_t wlock; /* lock for transmit side 5c */
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int mru; /* max receive unit 60 */
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+ int mru_alloc; /* MAX(1500,MRU) for dev_alloc_skb() */
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unsigned int flags; /* control bits 64 */
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unsigned int xstate; /* transmit state bits 68 */
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unsigned int rstate; /* receive state bits 6c */
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@@ -129,6 +130,7 @@
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struct sock_fprog pass_filter; /* filter for packets to pass */
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struct sock_fprog active_filter;/* filter for pkts to reset idle */
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#endif /* CONFIG_PPP_FILTER */
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+ int xpad; /* ECP or CCP (MPPE) transmit padding */
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};
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/*
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@@ -552,7 +554,9 @@
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case PPPIOCSMRU:
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if (get_user(val, (int *) arg))
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break;
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- ppp->mru = val;
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+ ppp->mru_alloc = ppp->mru = val;
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+ if (ppp->mru_alloc < PPP_MRU)
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+ ppp->mru_alloc = PPP_MRU; /* increase for broken peers */
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err = 0;
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break;
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@@ -1023,14 +1027,35 @@
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case PPP_CCP:
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/* peek at outbound CCP frames */
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ppp_ccp_peek(ppp, skb, 0);
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+ /*
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+ * When LZS or MPPE/MPPC is negotiated we don't send
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+ * CCP_RESETACK after receiving CCP_RESETREQ; in fact pppd
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+ * sends such a packet but we silently discard it here
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+ */
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+ if (CCP_CODE(skb->data+2) == CCP_RESETACK
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+ && (ppp->xcomp->compress_proto == CI_MPPE
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+ || ppp->xcomp->compress_proto == CI_LZS)) {
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+ --ppp->stats.tx_packets;
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+ ppp->stats.tx_bytes -= skb->len - 2;
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+ kfree_skb(skb);
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+ return;
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+ }
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break;
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}
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/* try to do packet compression */
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if ((ppp->xstate & SC_COMP_RUN) && ppp->xc_state != 0
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&& proto != PPP_LCP && proto != PPP_CCP) {
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- new_skb = alloc_skb(ppp->dev->mtu + ppp->dev->hard_header_len,
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- GFP_ATOMIC);
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+ int comp_ovhd = 0;
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+ /* because of possible data expansion when MPPC or LZS
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+ is used, allocate compressor's buffer about 12.5% bigger
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+ than MTU */
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+ if (ppp->xcomp->compress_proto == CI_MPPE)
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+ comp_ovhd = (((ppp->dev->mtu * 9) / 8) + 1);
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+ else if (ppp->xcomp->compress_proto == CI_LZS)
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+ comp_ovhd = (((ppp->dev->mtu * 9) / 8) + 1) + LZS_OVHD;
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+ new_skb = alloc_skb(ppp->dev->mtu + ppp->dev->hard_header_len
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+ + ppp->xpad + comp_ovhd, GFP_ATOMIC);
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if (new_skb == 0) {
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printk(KERN_ERR "PPP: no memory (comp pkt)\n");
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goto drop;
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@@ -1042,15 +1067,28 @@
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/* compressor still expects A/C bytes in hdr */
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len = ppp->xcomp->compress(ppp->xc_state, skb->data - 2,
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new_skb->data, skb->len + 2,
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- ppp->dev->mtu + PPP_HDRLEN);
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+ ppp->dev->mtu + ppp->xpad
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+ + PPP_HDRLEN);
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if (len > 0 && (ppp->flags & SC_CCP_UP)) {
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kfree_skb(skb);
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skb = new_skb;
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skb_put(skb, len);
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skb_pull(skb, 2); /* pull off A/C bytes */
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- } else {
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+ } else if (len == 0) {
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/* didn't compress, or CCP not up yet */
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kfree_skb(new_skb);
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+ } else {
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+ /*
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+ * (len < 0)
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+ * MPPE requires that we do not send unencrypted
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+ * frames. The compressor will return -1 if we
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+ * should drop the frame. We cannot simply test
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+ * the compress_proto because MPPE and MPPC share
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+ * the same number.
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+ */
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+ printk(KERN_ERR "ppp: compressor dropped pkt\n");
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+ kfree_skb(new_skb);
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+ goto drop;
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}
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}
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@@ -1538,14 +1576,15 @@
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int len;
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if (proto == PPP_COMP) {
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- ns = dev_alloc_skb(ppp->mru + PPP_HDRLEN);
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+ ns = dev_alloc_skb(ppp->mru_alloc + PPP_HDRLEN);
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if (ns == 0) {
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printk(KERN_ERR "ppp_decompress_frame: no memory\n");
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goto err;
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}
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/* the decompressor still expects the A/C bytes in the hdr */
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len = ppp->rcomp->decompress(ppp->rc_state, skb->data - 2,
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- skb->len + 2, ns->data, ppp->mru + PPP_HDRLEN);
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+ skb->len + 2, ns->data,
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+ ppp->mru_alloc + PPP_HDRLEN);
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if (len < 0) {
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/* Pass the compressed frame to pppd as an
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error indication. */
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@@ -1571,7 +1610,12 @@
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return skb;
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err:
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- ppp->rstate |= SC_DC_ERROR;
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+ if (ppp->rcomp->compress_proto != CI_MPPE
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+ && ppp->rcomp->compress_proto != CI_LZS) {
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+ /* If decompression protocol isn't MPPE/MPPC or LZS, we set
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+ SC_DC_ERROR flag and wait for CCP_RESETACK */
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+ ppp->rstate |= SC_DC_ERROR;
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+ }
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ppp_receive_error(ppp);
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return skb;
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}
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@@ -1980,6 +2024,20 @@
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ocomp->comp_free(ostate);
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err = 0;
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}
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+ if (ccp_option[0] == CI_MPPE)
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+ /*
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+ * pppd (userland) has reduced the MTU by MPPE_PAD,
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+ * to accomodate "compressor" growth. We must
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+ * increase the space allocated for compressor
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+ * output in ppp_send_frame() accordingly. Note
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+ * that from a purist's view, it may be more correct
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+ * to require multilink and fragment large packets,
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+ * but that seems inefficient compared to this
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+ * little trick.
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+ */
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+ ppp->xpad = MPPE_PAD;
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+ else
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+ ppp->xpad = 0;
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|
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} else {
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state = cp->decomp_alloc(ccp_option, data.length);
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@@ -2251,6 +2309,7 @@
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|
/* Initialize the new ppp unit */
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ppp->file.index = unit;
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ppp->mru = PPP_MRU;
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+ ppp->mru_alloc = PPP_MRU;
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init_ppp_file(&ppp->file, INTERFACE);
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ppp->file.hdrlen = PPP_HDRLEN - 2; /* don't count proto bytes */
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for (i = 0; i < NUM_NP; ++i)
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diff -ruN linux-2.4.21.orig/drivers/net/ppp_mppe_crypto.c linux-2.4.21/drivers/net/ppp_mppe_crypto.c
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--- linux-2.4.21.orig/drivers/net/ppp_mppe_crypto.c 1970-01-01 01:00:00.000000000 +0100
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|
+++ linux-2.4.21/drivers/net/ppp_mppe_crypto.c 2003-07-08 19:07:18.000000000 +0200
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|
@@ -0,0 +1,257 @@
|
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|
+/*
|
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+ * ppp_mppe_crypto.c - cryptografic funtions for MPPE
|
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|
+ *
|
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+ * This code is Public Domain. Please see comments below.
|
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|
+ *
|
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|
+ * I have just put SHA1 and ARCFOUR implementations into one file
|
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|
+ * in order to not pollute kernel namespace.
|
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|
+ *
|
|||
|
+ * Jan Dubiec <jdx@slackware.pl>, 2003-07-08
|
|||
|
+ */
|
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|
+
|
|||
|
+/*
|
|||
|
+ * ftp://ftp.funet.fi/pub/crypt/hash/sha/sha1.c
|
|||
|
+ *
|
|||
|
+ * SHA-1 in C
|
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|
+ * By Steve Reid <steve@edmweb.com>
|
|||
|
+ * 100% Public Domain
|
|||
|
+ *
|
|||
|
+ * Test Vectors (from FIPS PUB 180-1)
|
|||
|
+ * "abc"
|
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|
+ * A9993E36 4706816A BA3E2571 7850C26C 9CD0D89D
|
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|
+ * "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq"
|
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|
+ * 84983E44 1C3BD26E BAAE4AA1 F95129E5 E54670F1
|
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|
+ * A million repetitions of "a"
|
|||
|
+ * 34AA973C D4C4DAA4 F61EEB2B DBAD2731 6534016F
|
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|
+ */
|
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|
+
|
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|
+/* #define SHA1HANDSOFF * Copies data before messing with it. */
|
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|
+
|
|||
|
+#if defined(__linux__)
|
|||
|
+#include <asm/byteorder.h>
|
|||
|
+#include <linux/string.h>
|
|||
|
+#elif defined(__solaris__)
|
|||
|
+#include <sys/isa_defs.h>
|
|||
|
+#include <sys/ddi.h>
|
|||
|
+#include <sys/sunddi.h>
|
|||
|
+#define memcpy(d, s, c) bcopy(s, d, c)
|
|||
|
+#define memset(d, b, c) bzero(d, c)
|
|||
|
+#endif
|
|||
|
+
|
|||
|
+#include "ppp_mppe_crypto.h"
|
|||
|
+
|
|||
|
+static void SHA1_Transform(unsigned long[5], const unsigned char[64]);
|
|||
|
+
|
|||
|
+#define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))
|
|||
|
+
|
|||
|
+/* blk0() and blk() perform the initial expand. */
|
|||
|
+/* I got the idea of expanding during the round function from SSLeay */
|
|||
|
+#if defined(__LITTLE_ENDIAN) || defined(_LITTLE_ENDIAN)
|
|||
|
+#define blk0(i) (block->l[i] = (rol(block->l[i],24)&0xFF00FF00) \
|
|||
|
+ |(rol(block->l[i],8)&0x00FF00FF))
|
|||
|
+#elif defined(__BIG_ENDIAN) || defined(_BIG_ENDIAN)
|
|||
|
+#define blk0(i) block->l[i]
|
|||
|
+#else
|
|||
|
+#error Endianness not defined
|
|||
|
+#endif
|
|||
|
+#define blk(i) (block->l[i&15] = rol(block->l[(i+13)&15]^block->l[(i+8)&15] \
|
|||
|
+ ^block->l[(i+2)&15]^block->l[i&15],1))
|
|||
|
+
|
|||
|
+/* (R0+R1), R2, R3, R4 are the different operations used in SHA1 */
|
|||
|
+#define R0(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk0(i)+0x5A827999+rol(v,5);w=rol(w,30);
|
|||
|
+#define R1(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk(i)+0x5A827999+rol(v,5);w=rol(w,30);
|
|||
|
+#define R2(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0x6ED9EBA1+rol(v,5);w=rol(w,30);
|
|||
|
+#define R3(v,w,x,y,z,i) z+=(((w|x)&y)|(w&x))+blk(i)+0x8F1BBCDC+rol(v,5);w=rol(w,30);
|
|||
|
+#define R4(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0xCA62C1D6+rol(v,5);w=rol(w,30);
|
|||
|
+
|
|||
|
+/* Hash a single 512-bit block. This is the core of the algorithm. */
|
|||
|
+static void
|
|||
|
+SHA1_Transform(unsigned long state[5], const unsigned char buffer[64])
|
|||
|
+{
|
|||
|
+ unsigned long a, b, c, d, e;
|
|||
|
+ typedef union {
|
|||
|
+ unsigned char c[64];
|
|||
|
+ unsigned long l[16];
|
|||
|
+ } CHAR64LONG16;
|
|||
|
+ CHAR64LONG16 *block;
|
|||
|
+
|
|||
|
+#ifdef SHA1HANDSOFF
|
|||
|
+ static unsigned char workspace[64];
|
|||
|
+ block = (CHAR64LONG16 *) workspace;
|
|||
|
+ memcpy(block, buffer, 64);
|
|||
|
+#else
|
|||
|
+ block = (CHAR64LONG16 *) buffer;
|
|||
|
+#endif
|
|||
|
+ /* Copy context->state[] to working vars */
|
|||
|
+ a = state[0];
|
|||
|
+ b = state[1];
|
|||
|
+ c = state[2];
|
|||
|
+ d = state[3];
|
|||
|
+ e = state[4];
|
|||
|
+ /* 4 rounds of 20 operations each. Loop unrolled. */
|
|||
|
+ R0(a,b,c,d,e, 0); R0(e,a,b,c,d, 1); R0(d,e,a,b,c, 2); R0(c,d,e,a,b, 3);
|
|||
|
+ R0(b,c,d,e,a, 4); R0(a,b,c,d,e, 5); R0(e,a,b,c,d, 6); R0(d,e,a,b,c, 7);
|
|||
|
+ R0(c,d,e,a,b, 8); R0(b,c,d,e,a, 9); R0(a,b,c,d,e,10); R0(e,a,b,c,d,11);
|
|||
|
+ R0(d,e,a,b,c,12); R0(c,d,e,a,b,13); R0(b,c,d,e,a,14); R0(a,b,c,d,e,15);
|
|||
|
+ R1(e,a,b,c,d,16); R1(d,e,a,b,c,17); R1(c,d,e,a,b,18); R1(b,c,d,e,a,19);
|
|||
|
+ R2(a,b,c,d,e,20); R2(e,a,b,c,d,21); R2(d,e,a,b,c,22); R2(c,d,e,a,b,23);
|
|||
|
+ R2(b,c,d,e,a,24); R2(a,b,c,d,e,25); R2(e,a,b,c,d,26); R2(d,e,a,b,c,27);
|
|||
|
+ R2(c,d,e,a,b,28); R2(b,c,d,e,a,29); R2(a,b,c,d,e,30); R2(e,a,b,c,d,31);
|
|||
|
+ R2(d,e,a,b,c,32); R2(c,d,e,a,b,33); R2(b,c,d,e,a,34); R2(a,b,c,d,e,35);
|
|||
|
+ R2(e,a,b,c,d,36); R2(d,e,a,b,c,37); R2(c,d,e,a,b,38); R2(b,c,d,e,a,39);
|
|||
|
+ R3(a,b,c,d,e,40); R3(e,a,b,c,d,41); R3(d,e,a,b,c,42); R3(c,d,e,a,b,43);
|
|||
|
+ R3(b,c,d,e,a,44); R3(a,b,c,d,e,45); R3(e,a,b,c,d,46); R3(d,e,a,b,c,47);
|
|||
|
+ R3(c,d,e,a,b,48); R3(b,c,d,e,a,49); R3(a,b,c,d,e,50); R3(e,a,b,c,d,51);
|
|||
|
+ R3(d,e,a,b,c,52); R3(c,d,e,a,b,53); R3(b,c,d,e,a,54); R3(a,b,c,d,e,55);
|
|||
|
+ R3(e,a,b,c,d,56); R3(d,e,a,b,c,57); R3(c,d,e,a,b,58); R3(b,c,d,e,a,59);
|
|||
|
+ R4(a,b,c,d,e,60); R4(e,a,b,c,d,61); R4(d,e,a,b,c,62); R4(c,d,e,a,b,63);
|
|||
|
+ R4(b,c,d,e,a,64); R4(a,b,c,d,e,65); R4(e,a,b,c,d,66); R4(d,e,a,b,c,67);
|
|||
|
+ R4(c,d,e,a,b,68); R4(b,c,d,e,a,69); R4(a,b,c,d,e,70); R4(e,a,b,c,d,71);
|
|||
|
+ R4(d,e,a,b,c,72); R4(c,d,e,a,b,73); R4(b,c,d,e,a,74); R4(a,b,c,d,e,75);
|
|||
|
+ R4(e,a,b,c,d,76); R4(d,e,a,b,c,77); R4(c,d,e,a,b,78); R4(b,c,d,e,a,79);
|
|||
|
+ /* Add the working vars back into context.state[] */
|
|||
|
+ state[0] += a;
|
|||
|
+ state[1] += b;
|
|||
|
+ state[2] += c;
|
|||
|
+ state[3] += d;
|
|||
|
+ state[4] += e;
|
|||
|
+ /* Wipe variables */
|
|||
|
+ a = b = c = d = e = 0;
|
|||
|
+}
|
|||
|
+
|
|||
|
+/* SHA1Init - Initialize new context */
|
|||
|
+void
|
|||
|
+SHA1_Init(SHA1_CTX *context)
|
|||
|
+{
|
|||
|
+ /* SHA1 initialization constants */
|
|||
|
+ context->state[0] = 0x67452301;
|
|||
|
+ context->state[1] = 0xEFCDAB89;
|
|||
|
+ context->state[2] = 0x98BADCFE;
|
|||
|
+ context->state[3] = 0x10325476;
|
|||
|
+ context->state[4] = 0xC3D2E1F0;
|
|||
|
+ context->count[0] = context->count[1] = 0;
|
|||
|
+}
|
|||
|
+
|
|||
|
+/* Run your data through this. */
|
|||
|
+void
|
|||
|
+SHA1_Update(SHA1_CTX *context, const unsigned char *data, unsigned int len)
|
|||
|
+{
|
|||
|
+ unsigned int i, j;
|
|||
|
+
|
|||
|
+ j = (context->count[0] >> 3) & 63;
|
|||
|
+ if ((context->count[0] += len << 3) < (len << 3)) context->count[1]++;
|
|||
|
+ context->count[1] += (len >> 29);
|
|||
|
+ if ((j + len) > 63) {
|
|||
|
+ memcpy(&context->buffer[j], data, (i = 64-j));
|
|||
|
+ SHA1_Transform(context->state, context->buffer);
|
|||
|
+ for ( ; i + 63 < len; i += 64) {
|
|||
|
+ SHA1_Transform(context->state, &data[i]);
|
|||
|
+ }
|
|||
|
+ j = 0;
|
|||
|
+ }
|
|||
|
+ else
|
|||
|
+ i = 0;
|
|||
|
+
|
|||
|
+ memcpy(&context->buffer[j], &data[i], len - i);
|
|||
|
+}
|
|||
|
+
|
|||
|
+/* Add padding and return the message digest. */
|
|||
|
+void
|
|||
|
+SHA1_Final(unsigned char digest[20], SHA1_CTX *context)
|
|||
|
+{
|
|||
|
+ unsigned long i, j;
|
|||
|
+ unsigned char finalcount[8];
|
|||
|
+
|
|||
|
+ for (i = 0; i < 8; i++) {
|
|||
|
+ finalcount[i] = (unsigned char)((context->count[(i >= 4 ? 0 : 1)]
|
|||
|
+ >> ((3-(i & 3)) * 8) ) & 255); /* Endian independent */
|
|||
|
+ }
|
|||
|
+ SHA1_Update(context, (unsigned char *) "\200", 1);
|
|||
|
+ while ((context->count[0] & 504) != 448) {
|
|||
|
+ SHA1_Update(context, (unsigned char *) "\0", 1);
|
|||
|
+ }
|
|||
|
+ SHA1_Update(context, finalcount, 8); /* Should cause a SHA1Transform() */
|
|||
|
+ for (i = 0; i < 20; i++) {
|
|||
|
+ digest[i] = (unsigned char)
|
|||
|
+ ((context->state[i>>2] >> ((3-(i & 3)) * 8) ) & 255);
|
|||
|
+ }
|
|||
|
+ /* Wipe variables */
|
|||
|
+ i = j = 0;
|
|||
|
+ memset(context->buffer, 0, 64);
|
|||
|
+ memset(context->state, 0, 20);
|
|||
|
+ memset(context->count, 0, 8);
|
|||
|
+ memset(&finalcount, 0, 8);
|
|||
|
+#ifdef SHA1HANDSOFF /* make SHA1Transform overwrite it's own static vars */
|
|||
|
+ SHA1Transform(context->state, context->buffer);
|
|||
|
+#endif
|
|||
|
+}
|
|||
|
+
|
|||
|
+/*
|
|||
|
+ * arcfour.c
|
|||
|
+ * by Frank Cusack <frank@google.com>
|
|||
|
+ * 100% public domain
|
|||
|
+ *
|
|||
|
+ * Implemented from the description in _Applied Cryptography_, 2nd ed.
|
|||
|
+ *
|
|||
|
+ * ** Distribution ** of this software is unlimited and unrestricted.
|
|||
|
+ *
|
|||
|
+ * ** Use ** of this software is almost certainly legal; however, refer
|
|||
|
+ * to <http://theory.lcs.mit.edu/~rivest/faq.html>.
|
|||
|
+ */
|
|||
|
+
|
|||
|
+#define swap(a, b) \
|
|||
|
+{ \
|
|||
|
+ unsigned char t = b; \
|
|||
|
+ b = a; \
|
|||
|
+ a = t; \
|
|||
|
+}
|
|||
|
+
|
|||
|
+/*
|
|||
|
+ * Initialize arcfour from a key.
|
|||
|
+ */
|
|||
|
+void
|
|||
|
+arcfour_setkey(arcfour_context *context, const unsigned char *key,
|
|||
|
+ unsigned keylen)
|
|||
|
+{
|
|||
|
+ unsigned i, j;
|
|||
|
+ unsigned char K[256];
|
|||
|
+
|
|||
|
+ context->i = context->j = 0;
|
|||
|
+
|
|||
|
+ for (i = 0; i < 256; i++) {
|
|||
|
+ context->S[i] = i;
|
|||
|
+ K[i] = key[i % keylen];
|
|||
|
+ }
|
|||
|
+
|
|||
|
+ j = 0;
|
|||
|
+ for (i = 0; i < 256; i++) {
|
|||
|
+ j = (j + context->S[i] + K[i]) % 256;
|
|||
|
+ swap(context->S[i], context->S[j]);
|
|||
|
+ }
|
|||
|
+
|
|||
|
+ memset(K, 0, sizeof(K));
|
|||
|
+}
|
|||
|
+
|
|||
|
+/*
|
|||
|
+ * plaintext -> ciphertext (or vice versa)
|
|||
|
+ */
|
|||
|
+void
|
|||
|
+arcfour_encrypt(arcfour_context *context, const unsigned char *in, unsigned len,
|
|||
|
+ unsigned char *out)
|
|||
|
+{
|
|||
|
+ unsigned i = context->i;
|
|||
|
+ unsigned j = context->j;
|
|||
|
+ unsigned char *S = context->S;
|
|||
|
+ unsigned char K;
|
|||
|
+
|
|||
|
+ while (len--) {
|
|||
|
+ i = (i + 1) % 256;
|
|||
|
+ j = (j + S[i]) % 256;
|
|||
|
+ swap(S[i], S[j]);
|
|||
|
+ K = S[(S[i] + S[j]) % 256];
|
|||
|
+ *out++ = *in++ ^ K;
|
|||
|
+ }
|
|||
|
+
|
|||
|
+ context->i = i;
|
|||
|
+ context->j = j;
|
|||
|
+}
|
|||
|
diff -ruN linux-2.4.21.orig/drivers/net/ppp_mppe_crypto.h linux-2.4.21/drivers/net/ppp_mppe_crypto.h
|
|||
|
--- linux-2.4.21.orig/drivers/net/ppp_mppe_crypto.h 1970-01-01 01:00:00.000000000 +0100
|
|||
|
+++ linux-2.4.21/drivers/net/ppp_mppe_crypto.h 2003-07-08 19:07:25.000000000 +0200
|
|||
|
@@ -0,0 +1,40 @@
|
|||
|
+/*
|
|||
|
+ * ppp_mppe_crypto.h - cryptografic funtion prototypes for MPPE
|
|||
|
+ *
|
|||
|
+ * This code is Public Domain. Please see comments below.
|
|||
|
+ *
|
|||
|
+ * I have just put SHA1 and ARCFOUR declarations into one file
|
|||
|
+ * in order to not pollute kernel namespace.
|
|||
|
+ *
|
|||
|
+ * Jan Dubiec <jdx@slackware.pl>, 2003-07-08
|
|||
|
+ */
|
|||
|
+
|
|||
|
+#ifndef _PPP_MPPE_CRYPTO_
|
|||
|
+#define _PPP_MPPE_CRYPTO_
|
|||
|
+
|
|||
|
+/* SHA1 definitions and prototypes */
|
|||
|
+typedef struct {
|
|||
|
+ unsigned long state[5];
|
|||
|
+ unsigned long count[2];
|
|||
|
+ unsigned char buffer[64];
|
|||
|
+} SHA1_CTX;
|
|||
|
+
|
|||
|
+#define SHA1_SIGNATURE_SIZE 20
|
|||
|
+
|
|||
|
+extern void SHA1_Init(SHA1_CTX *);
|
|||
|
+extern void SHA1_Update(SHA1_CTX *, const unsigned char *, unsigned int);
|
|||
|
+extern void SHA1_Final(unsigned char[SHA1_SIGNATURE_SIZE], SHA1_CTX *);
|
|||
|
+
|
|||
|
+/* ARCFOUR (aka RC4) definitions and prototypes */
|
|||
|
+typedef struct {
|
|||
|
+ unsigned i;
|
|||
|
+ unsigned j;
|
|||
|
+ unsigned char S[256];
|
|||
|
+} arcfour_context;
|
|||
|
+
|
|||
|
+extern void arcfour_setkey(arcfour_context *, const unsigned char *, unsigned);
|
|||
|
+extern void arcfour_encrypt(arcfour_context *, const unsigned char *, unsigned,
|
|||
|
+ unsigned char *);
|
|||
|
+#define arcfour_decrypt arcfour_encrypt
|
|||
|
+
|
|||
|
+#endif /* _PPP_MPPE_CRYPTO_ */
|
|||
|
diff -ruN linux-2.4.21.orig/drivers/net/ppp_mppe_mppc_comp.c linux-2.4.21/drivers/net/ppp_mppe_mppc_comp.c
|
|||
|
--- linux-2.4.21.orig/drivers/net/ppp_mppe_mppc_comp.c 1970-01-01 01:00:00.000000000 +0100
|
|||
|
+++ linux-2.4.21/drivers/net/ppp_mppe_mppc_comp.c 2003-08-07 22:36:59.000000000 +0200
|
|||
|
@@ -0,0 +1,1144 @@
|
|||
|
+/*
|
|||
|
+ * ppp_mppe_mppc_comp.c - MPPC/MPPE "compressor/decompressor" module.
|
|||
|
+ *
|
|||
|
+ * Copyright (c) 1994 <20>rp<72>d Magos<6F>nyi <mag@bunuel.tii.matav.hu>
|
|||
|
+ * Copyright (c) 1999 Tim Hockin, Cobalt Networks Inc. <thockin@cobaltnet.com>
|
|||
|
+ * Copyright (c) 2002, 2003 Jan Dubiec <jdx@slackware.pl>
|
|||
|
+ *
|
|||
|
+ * Permission to use, copy, modify, and distribute this software and its
|
|||
|
+ * documentation is hereby granted, provided that the above copyright
|
|||
|
+ * notice appears in all copies. This software is provided without any
|
|||
|
+ * warranty, express or implied.
|
|||
|
+ *
|
|||
|
+ * The code is based on MPPE kernel module written by <20>rp<72>d Magos<6F>nyi and
|
|||
|
+ * Tim Hockin which can be found on http://planetmirror.com/pub/mppe/.
|
|||
|
+ * I have added MPPC and 56 bit session keys support in MPPE.
|
|||
|
+ *
|
|||
|
+ * WARNING! Although this is open source code, its usage in some countries
|
|||
|
+ * (in particular in the USA) may violate Stac Inc. patent for MPPC.
|
|||
|
+ *
|
|||
|
+ * Compile command:
|
|||
|
+ * gcc -O2 -Wall -I/usr/src/linux/include -D__KERNEL__ -DMODULE -c ppp_mppe_mppc_comp.c
|
|||
|
+ *
|
|||
|
+ * ==FILEVERSION 20030807==
|
|||
|
+ *
|
|||
|
+ */
|
|||
|
+
|
|||
|
+#include <linux/module.h>
|
|||
|
+#include <linux/slab.h>
|
|||
|
+#include <linux/vmalloc.h>
|
|||
|
+#include <linux/init.h>
|
|||
|
+
|
|||
|
+#include <linux/ppp_defs.h>
|
|||
|
+#include <linux/ppp-comp.h>
|
|||
|
+
|
|||
|
+#include "ppp_mppe_crypto.h"
|
|||
|
+
|
|||
|
+/*
|
|||
|
+ * State for a mppc/mppe "(de)compressor".
|
|||
|
+ */
|
|||
|
+struct ppp_mppe_state {
|
|||
|
+ arcfour_context arcfour_context;
|
|||
|
+ u8 master_key[MPPE_MAX_KEY_LEN];
|
|||
|
+ u8 session_key[MPPE_MAX_KEY_LEN];
|
|||
|
+ u8 mppc; /* do we use compression (MPPC)? */
|
|||
|
+ u8 mppe; /* do we use encryption (MPPE)? */
|
|||
|
+ u8 keylen; /* key length in bytes */
|
|||
|
+ u8 bitkeylen; /* key length in bits */
|
|||
|
+ u16 ccount; /* coherency counter */
|
|||
|
+ u16 bits; /* MPPC/MPPE control bits */
|
|||
|
+ u8 stateless; /* do we use stateless mode? */
|
|||
|
+ u8 nextflushed; /* set A bit in the next outgoing packet;
|
|||
|
+ used only by compressor*/
|
|||
|
+ u8 flushexpected; /* drop packets until A bit is received;
|
|||
|
+ used only by decompressor*/
|
|||
|
+ u8 *hist; /* MPPC history */
|
|||
|
+ u16 *hash; /* Hash table; used only by compressor */
|
|||
|
+ u16 histptr; /* history "cursor" */
|
|||
|
+ int unit;
|
|||
|
+ int debug;
|
|||
|
+ int mru;
|
|||
|
+ struct compstat stats;
|
|||
|
+};
|
|||
|
+
|
|||
|
+#define MPPE_OVHD 2 /* MPPE overhead */
|
|||
|
+#define MPPE_HIST_LEN 8192 /* MPPC history size */
|
|||
|
+#define MPPE_MAX_CCOUNT 0x0FFF /* max. coherency counter value */
|
|||
|
+
|
|||
|
+#define MPPE_BIT_FLUSHED 0x80 /* bit A */
|
|||
|
+#define MPPE_BIT_RESET 0x40 /* bit B */
|
|||
|
+#define MPPE_BIT_COMP 0x20 /* bit C */
|
|||
|
+#define MPPE_BIT_ENCRYPTED 0x10 /* bit D */
|
|||
|
+
|
|||
|
+#define MPPE_SALT0 0xD1 /* values used in MPPE key derivation */
|
|||
|
+#define MPPE_SALT1 0x26 /* according to RFC3079 */
|
|||
|
+#define MPPE_SALT2 0x9E
|
|||
|
+
|
|||
|
+#define MPPE_CCOUNT(x) ((((x)[4] & 0x0f) << 8) + (x)[5])
|
|||
|
+#define MPPE_BITS(x) ((x)[4] & 0xf0)
|
|||
|
+#define MPPE_CTRLHI(x) ((((x)->ccount & 0xf00)>>8)|((x)->bits))
|
|||
|
+#define MPPE_CTRLLO(x) ((x)->ccount & 0xff)
|
|||
|
+
|
|||
|
+/*
|
|||
|
+ * Key Derivation, from RFC 3078, RFC 3079.
|
|||
|
+ * Equivalent to Get_Key() for MS-CHAP as described in RFC 3079.
|
|||
|
+ */
|
|||
|
+static void
|
|||
|
+GetNewKeyFromSHA(unsigned char *MasterKey, unsigned char *SessionKey,
|
|||
|
+ unsigned long SessionKeyLength, unsigned char *InterimKey)
|
|||
|
+{
|
|||
|
+ /*Pads used in key derivation */
|
|||
|
+ static unsigned char SHAPad1[40] =
|
|||
|
+ { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
|||
|
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
|||
|
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
|||
|
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
|
|||
|
+
|
|||
|
+ static unsigned char SHAPad2[40] =
|
|||
|
+ { 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2,
|
|||
|
+ 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2,
|
|||
|
+ 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2,
|
|||
|
+ 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2, 0xF2 };
|
|||
|
+
|
|||
|
+ SHA1_CTX Context;
|
|||
|
+ unsigned char Digest[SHA1_SIGNATURE_SIZE];
|
|||
|
+
|
|||
|
+ SHA1_Init(&Context);
|
|||
|
+ SHA1_Update(&Context, MasterKey, SessionKeyLength);
|
|||
|
+ SHA1_Update(&Context, SHAPad1, sizeof(SHAPad1));
|
|||
|
+ SHA1_Update(&Context, SessionKey, SessionKeyLength);
|
|||
|
+ SHA1_Update(&Context, SHAPad2, sizeof(SHAPad2));
|
|||
|
+ SHA1_Final(Digest,&Context);
|
|||
|
+ memcpy(InterimKey, Digest, SessionKeyLength);
|
|||
|
+}
|
|||
|
+
|
|||
|
+static void
|
|||
|
+mppe_change_key(struct ppp_mppe_state *state, int initialize)
|
|||
|
+{
|
|||
|
+ unsigned char InterimKey[MPPE_MAX_KEY_LEN];
|
|||
|
+
|
|||
|
+ GetNewKeyFromSHA(state->master_key, state->session_key,
|
|||
|
+ state->keylen, InterimKey);
|
|||
|
+ if (initialize) {
|
|||
|
+ memcpy(state->session_key, InterimKey, state->keylen);
|
|||
|
+ } else {
|
|||
|
+ arcfour_setkey(&state->arcfour_context, InterimKey, state->keylen);
|
|||
|
+ arcfour_encrypt(&state->arcfour_context, InterimKey, state->keylen,
|
|||
|
+ state->session_key);
|
|||
|
+ }
|
|||
|
+ if (state->keylen == 8) {
|
|||
|
+ if (state->bitkeylen == 40) {
|
|||
|
+ state->session_key[0] = MPPE_SALT0;
|
|||
|
+ state->session_key[1] = MPPE_SALT1;
|
|||
|
+ state->session_key[2] = MPPE_SALT2;
|
|||
|
+ } else {
|
|||
|
+ state->session_key[0] = MPPE_SALT0;
|
|||
|
+ }
|
|||
|
+ }
|
|||
|
+ arcfour_setkey(&state->arcfour_context, state->session_key, state->keylen);
|
|||
|
+}
|
|||
|
+
|
|||
|
+/* increase 12-bit coherency counter */
|
|||
|
+static inline void
|
|||
|
+mppe_increase_ccount(struct ppp_mppe_state *state)
|
|||
|
+{
|
|||
|
+ state->ccount = (state->ccount + 1) & MPPE_MAX_CCOUNT;
|
|||
|
+ if (state->mppe) {
|
|||
|
+ if (state->stateless) {
|
|||
|
+ mppe_change_key(state, 0);
|
|||
|
+ state->nextflushed = 1;
|
|||
|
+ } else {
|
|||
|
+ if ((state->ccount & 0xff) == 0xff) {
|
|||
|
+ mppe_change_key(state, 0);
|
|||
|
+ state->nextflushed = 1;
|
|||
|
+ }
|
|||
|
+ }
|
|||
|
+ }
|
|||
|
+}
|
|||
|
+
|
|||
|
+/* allocate space for a MPPE/MPPC (de)compressor. */
|
|||
|
+/* comp != 0 -> init compressor */
|
|||
|
+/* comp = 0 -> init decompressor */
|
|||
|
+static void *
|
|||
|
+mppe_alloc(unsigned char *options, int opt_len, int comp)
|
|||
|
+{
|
|||
|
+ struct ppp_mppe_state *state;
|
|||
|
+ u8* fname;
|
|||
|
+
|
|||
|
+ fname = comp ? "mppe_comp_alloc" : "mppe_decomp_alloc";
|
|||
|
+
|
|||
|
+ /*
|
|||
|
+ Hack warning - additionally to the standard MPPC/MPPE configuration
|
|||
|
+ options, pppd passes to the (de)copressor 8 or 16 byte session key.
|
|||
|
+ Therefore options[1] contains MPPC/MPPE configuration option length
|
|||
|
+ (CILEN_MPPE = 6), but the real options length, depending on the key
|
|||
|
+ length, is 6+8 or 6+16.
|
|||
|
+ */
|
|||
|
+ if (opt_len < CILEN_MPPE) {
|
|||
|
+ printk(KERN_WARNING "%s: wrong options length: %u\n", fname, opt_len);
|
|||
|
+ return NULL;
|
|||
|
+ }
|
|||
|
+
|
|||
|
+ if (options[0] != CI_MPPE || options[1] != CILEN_MPPE ||
|
|||
|
+ (options[2] & ~MPPE_STATELESS) != 0 ||
|
|||
|
+ options[3] != 0 || options[4] != 0 ||
|
|||
|
+ (options[5] & ~(MPPE_128BIT|MPPE_56BIT|MPPE_40BIT|MPPE_MPPC)) != 0 ||
|
|||
|
+ (options[5] & (MPPE_128BIT|MPPE_56BIT|MPPE_40BIT|MPPE_MPPC)) == 0) {
|
|||
|
+ printk(KERN_WARNING "%s: options rejected: o[0]=%02x, o[1]=%02x, "
|
|||
|
+ "o[2]=%02x, o[3]=%02x, o[4]=%02x, o[5]=%02x\n", fname, options[0],
|
|||
|
+ options[1], options[2], options[3], options[4], options[5]);
|
|||
|
+ return NULL;
|
|||
|
+ }
|
|||
|
+
|
|||
|
+ state = (struct ppp_mppe_state *)kmalloc(sizeof(*state), GFP_KERNEL);
|
|||
|
+ if (state == NULL) {
|
|||
|
+ printk(KERN_ERR "%s: cannot allocate space for %scompressor\n", fname,
|
|||
|
+ comp ? "" : "de");
|
|||
|
+ return NULL;
|
|||
|
+ }
|
|||
|
+ memset(state, 0, sizeof(struct ppp_mppe_state));
|
|||
|
+
|
|||
|
+ state->mppc = options[5] & MPPE_MPPC; /* Do we use MPPC? */
|
|||
|
+ state->mppe = options[5] & (MPPE_128BIT | MPPE_56BIT |
|
|||
|
+ MPPE_40BIT); /* Do we use MPPE? */
|
|||
|
+
|
|||
|
+ if (state->mppc) {
|
|||
|
+ /* allocate MPPC history */
|
|||
|
+ state->hist = (u8*)vmalloc(2*MPPE_HIST_LEN*sizeof(u8));
|
|||
|
+ if (state->hist == NULL) {
|
|||
|
+ kfree(state);
|
|||
|
+ printk(KERN_ERR "%s: cannot allocate space for MPPC history\n",
|
|||
|
+ fname);
|
|||
|
+ return NULL;
|
|||
|
+ }
|
|||
|
+
|
|||
|
+ /* allocate hashtable for MPPC compressor */
|
|||
|
+ if (comp) {
|
|||
|
+ state->hash = (u16*)vmalloc(MPPE_HIST_LEN*sizeof(u16));
|
|||
|
+ if (state->hash == NULL) {
|
|||
|
+ vfree(state->hist);
|
|||
|
+ kfree(state);
|
|||
|
+ printk(KERN_ERR "%s: cannot allocate space for MPPC history\n",
|
|||
|
+ fname);
|
|||
|
+ return NULL;
|
|||
|
+ }
|
|||
|
+ }
|
|||
|
+ }
|
|||
|
+
|
|||
|
+ MOD_INC_USE_COUNT;
|
|||
|
+
|
|||
|
+ if (state->mppe) { /* specific for MPPE */
|
|||
|
+ memcpy(state->master_key, options+CILEN_MPPE, MPPE_MAX_KEY_LEN);
|
|||
|
+ memcpy(state->session_key, state->master_key, MPPE_MAX_KEY_LEN);
|
|||
|
+ /* initial key generation is done in mppe_init() */
|
|||
|
+ }
|
|||
|
+
|
|||
|
+ return (void *) state;
|
|||
|
+}
|
|||
|
+
|
|||
|
+static void *
|
|||
|
+mppe_comp_alloc(unsigned char *options, int opt_len)
|
|||
|
+{
|
|||
|
+ return mppe_alloc(options, opt_len, 1);
|
|||
|
+}
|
|||
|
+
|
|||
|
+static void *
|
|||
|
+mppe_decomp_alloc(unsigned char *options, int opt_len)
|
|||
|
+{
|
|||
|
+ return mppe_alloc(options, opt_len, 0);
|
|||
|
+}
|
|||
|
+
|
|||
|
+/* cleanup the (de)compressor */
|
|||
|
+static void
|
|||
|
+mppe_comp_free(void *arg)
|
|||
|
+{
|
|||
|
+ struct ppp_mppe_state *state = (struct ppp_mppe_state *) arg;
|
|||
|
+
|
|||
|
+ if (state != NULL) {
|
|||
|
+ if (state->hist != NULL)
|
|||
|
+ vfree(state->hist);
|
|||
|
+ if (state->hash != NULL)
|
|||
|
+ vfree(state->hash);
|
|||
|
+ kfree(state);
|
|||
|
+ }
|
|||
|
+ MOD_DEC_USE_COUNT;
|
|||
|
+}
|
|||
|
+
|
|||
|
+/* init MPPC/MPPE (de)compresor */
|
|||
|
+/* comp != 0 -> init compressor */
|
|||
|
+/* comp = 0 -> init decompressor */
|
|||
|
+static int
|
|||
|
+mppe_init(void *arg, unsigned char *options, int opt_len, int unit,
|
|||
|
+ int hdrlen, int mru, int debug, int comp)
|
|||
|
+{
|
|||
|
+ struct ppp_mppe_state *state = (struct ppp_mppe_state *) arg;
|
|||
|
+ u8* fname;
|
|||
|
+
|
|||
|
+ fname = comp ? "mppe_comp_init" : "mppe_decomp_init";
|
|||
|
+
|
|||
|
+ if (opt_len < CILEN_MPPE) {
|
|||
|
+ if (debug)
|
|||
|
+ printk(KERN_WARNING "%s: wrong options length: %u\n",
|
|||
|
+ fname, opt_len);
|
|||
|
+ return 0;
|
|||
|
+ }
|
|||
|
+
|
|||
|
+ if (options[0] != CI_MPPE || options[1] != CILEN_MPPE ||
|
|||
|
+ (options[2] & ~MPPE_STATELESS) != 0 ||
|
|||
|
+ options[3] != 0 || options[4] != 0 ||
|
|||
|
+ (options[5] & ~(MPPE_56BIT|MPPE_128BIT|MPPE_40BIT|MPPE_MPPC)) != 0 ||
|
|||
|
+ (options[5] & (MPPE_56BIT|MPPE_128BIT|MPPE_40BIT|MPPE_MPPC)) == 0) {
|
|||
|
+ if (debug)
|
|||
|
+ printk(KERN_WARNING "%s: options rejected: o[0]=%02x, o[1]=%02x, "
|
|||
|
+ "o[2]=%02x, o[3]=%02x, o[4]=%02x, o[5]=%02x\n", fname,
|
|||
|
+ options[0], options[1], options[2], options[3], options[4],
|
|||
|
+ options[5]);
|
|||
|
+ return 0;
|
|||
|
+ }
|
|||
|
+
|
|||
|
+ if ((options[5] & ~MPPE_MPPC) != MPPE_128BIT &&
|
|||
|
+ (options[5] & ~MPPE_MPPC) != MPPE_56BIT &&
|
|||
|
+ (options[5] & ~MPPE_MPPC) != MPPE_40BIT &&
|
|||
|
+ (options[5] & MPPE_MPPC) != MPPE_MPPC) {
|
|||
|
+ if (debug)
|
|||
|
+ printk(KERN_WARNING "%s: don't know what to do: o[5]=%02x\n",
|
|||
|
+ fname, options[5]);
|
|||
|
+ return 0;
|
|||
|
+ }
|
|||
|
+
|
|||
|
+ state->mppc = options[5] & MPPE_MPPC; /* Do we use MPPC? */
|
|||
|
+ state->mppe = options[5] & (MPPE_128BIT | MPPE_56BIT |
|
|||
|
+ MPPE_40BIT); /* Do we use MPPE? */
|
|||
|
+ state->stateless = options[2] & MPPE_STATELESS; /* Do we use stateless mode? */
|
|||
|
+
|
|||
|
+ switch (state->mppe) {
|
|||
|
+ case MPPE_40BIT: /* 40 bit key */
|
|||
|
+ state->keylen = 8;
|
|||
|
+ state->bitkeylen = 40;
|
|||
|
+ break;
|
|||
|
+ case MPPE_56BIT: /* 56 bit key */
|
|||
|
+ state->keylen = 8;
|
|||
|
+ state->bitkeylen = 56;
|
|||
|
+ break;
|
|||
|
+ case MPPE_128BIT: /* 128 bit key */
|
|||
|
+ state->keylen = 16;
|
|||
|
+ state->bitkeylen = 128;
|
|||
|
+ break;
|
|||
|
+ default:
|
|||
|
+ state->keylen = 0;
|
|||
|
+ state->bitkeylen = 0;
|
|||
|
+ }
|
|||
|
+
|
|||
|
+ state->ccount = MPPE_MAX_CCOUNT;
|
|||
|
+ state->bits = 0;
|
|||
|
+ state->unit = unit;
|
|||
|
+ state->debug = debug;
|
|||
|
+ state->histptr = MPPE_HIST_LEN;
|
|||
|
+ if (state->mppc) { /* reset history if MPPC was negotiated */
|
|||
|
+ memset(state->hist, 0, 2*MPPE_HIST_LEN*sizeof(u8));
|
|||
|
+ }
|
|||
|
+
|
|||
|
+ if (state->mppe) { /* generate initial session keys */
|
|||
|
+ mppe_change_key(state, 1);
|
|||
|
+ }
|
|||
|
+
|
|||
|
+ if (comp) { /* specific for compressor */
|
|||
|
+ state->nextflushed = 1;
|
|||
|
+ } else { /* specific for decompressor */
|
|||
|
+ state->mru = mru;
|
|||
|
+ state->flushexpected = 1;
|
|||
|
+ }
|
|||
|
+
|
|||
|
+ return 1;
|
|||
|
+}
|
|||
|
+
|
|||
|
+static int
|
|||
|
+mppe_comp_init(void *arg, unsigned char *options, int opt_len, int unit,
|
|||
|
+ int hdrlen, int debug)
|
|||
|
+{
|
|||
|
+ return mppe_init(arg, options, opt_len, unit, hdrlen, 0, debug, 1);
|
|||
|
+}
|
|||
|
+
|
|||
|
+
|
|||
|
+static int
|
|||
|
+mppe_decomp_init(void *arg, unsigned char *options, int opt_len, int unit,
|
|||
|
+ int hdrlen, int mru, int debug)
|
|||
|
+{
|
|||
|
+ return mppe_init(arg, options, opt_len, unit, hdrlen, mru, debug, 0);
|
|||
|
+}
|
|||
|
+
|
|||
|
+static void
|
|||
|
+mppe_comp_reset(void *arg)
|
|||
|
+{
|
|||
|
+ struct ppp_mppe_state *state = (struct ppp_mppe_state *)arg;
|
|||
|
+
|
|||
|
+ if (state->debug)
|
|||
|
+ printk(KERN_DEBUG "%s%d: resetting MPPC/MPPE compressor\n",
|
|||
|
+ __FUNCTION__, state->unit);
|
|||
|
+
|
|||
|
+ state->nextflushed = 1;
|
|||
|
+ if (state->mppe)
|
|||
|
+ arcfour_setkey(&state->arcfour_context, state->session_key,
|
|||
|
+ state->keylen);
|
|||
|
+}
|
|||
|
+
|
|||
|
+static void
|
|||
|
+mppe_decomp_reset(void *arg)
|
|||
|
+{
|
|||
|
+ /* When MPPC/MPPE is in use, we shouldn't receive any CCP Reset-Ack.
|
|||
|
+ But when we receive such a packet, we just ignore it. */
|
|||
|
+ return;
|
|||
|
+}
|
|||
|
+
|
|||
|
+static void
|
|||
|
+mppe_stats(void *arg, struct compstat *stats)
|
|||
|
+{
|
|||
|
+ struct ppp_mppe_state *state = (struct ppp_mppe_state *)arg;
|
|||
|
+
|
|||
|
+ *stats = state->stats;
|
|||
|
+}
|
|||
|
+
|
|||
|
+/***************************/
|
|||
|
+/**** Compression stuff ****/
|
|||
|
+/***************************/
|
|||
|
+/* inserts 1 to max. 8 bits into the output buffer */
|
|||
|
+static inline void putbits8(u8 *buf, u32 val, const u32 n, u32 *i, u32 *l)
|
|||
|
+{
|
|||
|
+ buf += *i;
|
|||
|
+ if (*l >= n) {
|
|||
|
+ *l = (*l) - n;
|
|||
|
+ val <<= *l;
|
|||
|
+ *buf = *buf | (val & 0xff);
|
|||
|
+ if (*l == 0) {
|
|||
|
+ *l = 8;
|
|||
|
+ (*i)++;
|
|||
|
+ *(++buf) = 0;
|
|||
|
+ }
|
|||
|
+ } else {
|
|||
|
+ (*i)++;
|
|||
|
+ *l = 8 - n + (*l);
|
|||
|
+ val <<= *l;
|
|||
|
+ *buf = *buf | ((val >> 8) & 0xff);
|
|||
|
+ *(++buf) = val & 0xff;
|
|||
|
+ }
|
|||
|
+}
|
|||
|
+
|
|||
|
+/* inserts 9 to max. 16 bits into the output buffer */
|
|||
|
+static inline void putbits16(u8 *buf, u32 val, const u32 n, u32 *i, u32 *l)
|
|||
|
+{
|
|||
|
+ buf += *i;
|
|||
|
+ if (*l >= n - 8) {
|
|||
|
+ (*i)++;
|
|||
|
+ *l = 8 - n + (*l);
|
|||
|
+ val <<= *l;
|
|||
|
+ *buf = *buf | ((val >> 8) & 0xff);
|
|||
|
+ *(++buf) = val & 0xff;
|
|||
|
+ if (*l == 0) {
|
|||
|
+ *l = 8;
|
|||
|
+ (*i)++;
|
|||
|
+ *(++buf) = 0;
|
|||
|
+ }
|
|||
|
+ } else {
|
|||
|
+ (*i)++; (*i)++;
|
|||
|
+ *l = 16 - n + (*l);
|
|||
|
+ val <<= *l;
|
|||
|
+ *buf = *buf | ((val >> 16) & 0xff);
|
|||
|
+ *(++buf) = (val >> 8) & 0xff;
|
|||
|
+ *(++buf) = val & 0xff;
|
|||
|
+ }
|
|||
|
+}
|
|||
|
+
|
|||
|
+/* inserts 17 to max. 24 bits into the output buffer */
|
|||
|
+static inline void putbits24(u8 *buf, u32 val, const u32 n, u32 *i, u32 *l)
|
|||
|
+{
|
|||
|
+ buf += *i;
|
|||
|
+ if (*l >= n - 16) {
|
|||
|
+ (*i)++; (*i)++;
|
|||
|
+ *l = 16 - n + (*l);
|
|||
|
+ val <<= *l;
|
|||
|
+ *buf = *buf | ((val >> 16) & 0xff);
|
|||
|
+ *(++buf) = (val >> 8) & 0xff;
|
|||
|
+ *(++buf) = val & 0xff;
|
|||
|
+ if (*l == 0) {
|
|||
|
+ *l = 8;
|
|||
|
+ (*i)++;
|
|||
|
+ *(++buf) = 0;
|
|||
|
+ }
|
|||
|
+ } else {
|
|||
|
+ (*i)++; (*i)++; (*i)++;
|
|||
|
+ *l = 24 - n + (*l);
|
|||
|
+ val <<= *l;
|
|||
|
+ *buf = *buf | ((val >> 24) & 0xff);
|
|||
|
+ *(++buf) = (val >> 16) & 0xff;
|
|||
|
+ *(++buf) = (val >> 8) & 0xff;
|
|||
|
+ *(++buf) = val & 0xff;
|
|||
|
+ }
|
|||
|
+}
|
|||
|
+
|
|||
|
+static int
|
|||
|
+mppc_compress(struct ppp_mppe_state *state, unsigned char *ibuf,
|
|||
|
+ unsigned char *obuf, int isize, int osize)
|
|||
|
+{
|
|||
|
+ u32 olen, off, len, idx, i, l;
|
|||
|
+ u8 *hist, *sbuf, *p, *q, *r, *s;
|
|||
|
+
|
|||
|
+ /*
|
|||
|
+ At this point, to avoid possible buffer overflow caused by packet
|
|||
|
+ expansion during/after compression, we should make sure that
|
|||
|
+ osize >= (((isize*9)/8)+1)+2, but we don't do that because in
|
|||
|
+ ppp_generic.c we just allocate bigger obuf.
|
|||
|
+
|
|||
|
+ Maximum MPPC packet expansion is 12.5%. This is the worst case when
|
|||
|
+ all octets in the input buffer are >= 0x80 and we cannot find any
|
|||
|
+ repeated tokens. Additionally we have to reserve 2 bytes for MPPE/MPPC
|
|||
|
+ status bits and coherency counter.
|
|||
|
+ */
|
|||
|
+
|
|||
|
+ hist = state->hist + MPPE_HIST_LEN;
|
|||
|
+ /* check if there is enough room at the end of the history */
|
|||
|
+ if (state->histptr + isize >= 2*MPPE_HIST_LEN) {
|
|||
|
+ state->bits |= MPPE_BIT_RESET;
|
|||
|
+ state->histptr = MPPE_HIST_LEN;
|
|||
|
+ memcpy(state->hist, hist, MPPE_HIST_LEN);
|
|||
|
+ }
|
|||
|
+ /* add packet to the history; isize must be <= MPPE_HIST_LEN */
|
|||
|
+ sbuf = state->hist + state->histptr;
|
|||
|
+ memcpy(sbuf, ibuf, isize);
|
|||
|
+ state->histptr += isize;
|
|||
|
+
|
|||
|
+ /* compress data */
|
|||
|
+ r = sbuf + isize;
|
|||
|
+ *obuf = olen = i = 0;
|
|||
|
+ l = 8;
|
|||
|
+ while (i < isize - 2) {
|
|||
|
+ s = q = sbuf + i;
|
|||
|
+ idx = ((40542*((((s[0]<<4)^s[1])<<4)^s[2]))>>4) & 0x1FFF;
|
|||
|
+ p = hist + state->hash[idx];
|
|||
|
+ state->hash[idx] = (u16) (s - hist);
|
|||
|
+ off = s - p;
|
|||
|
+ if (off > 8191 || off < 1 || *p++ != *s++ || *p++ != *s++ || *p++ != *s++)
|
|||
|
+ goto literal;
|
|||
|
+ if (r - q >= 64) {
|
|||
|
+ *p++ != *s++ || *p++ != *s++ || *p++ != *s++ || *p++ != *s++ ||
|
|||
|
+ *p++ != *s++ || *p++ != *s++ || *p++ != *s++ || *p++ != *s++ ||
|
|||
|
+ *p++ != *s++ || *p++ != *s++ || *p++ != *s++ || *p++ != *s++ ||
|
|||
|
+ *p++ != *s++ || *p++ != *s++ || *p++ != *s++ || *p++ != *s++ ||
|
|||
|
+ *p++ != *s++ || *p++ != *s++ || *p++ != *s++ || *p++ != *s++ ||
|
|||
|
+ *p++ != *s++ || *p++ != *s++ || *p++ != *s++ || *p++ != *s++ ||
|
|||
|
+ *p++ != *s++ || *p++ != *s++ || *p++ != *s++ || *p++ != *s++ ||
|
|||
|
+ *p++ != *s++ || *p++ != *s++ || *p++ != *s++ || *p++ != *s++ ||
|
|||
|
+ *p++ != *s++ || *p++ != *s++ || *p++ != *s++ || *p++ != *s++ ||
|
|||
|
+ *p++ != *s++ || *p++ != *s++ || *p++ != *s++ || *p++ != *s++ ||
|
|||
|
+ *p++ != *s++ || *p++ != *s++ || *p++ != *s++ || *p++ != *s++ ||
|
|||
|
+ *p++ != *s++ || *p++ != *s++ || *p++ != *s++ || *p++ != *s++ ||
|
|||
|
+ *p++ != *s++ || *p++ != *s++ || *p++ != *s++ || *p++ != *s++ ||
|
|||
|
+ *p++ != *s++ || *p++ != *s++ || *p++ != *s++ || *p++ != *s++ ||
|
|||
|
+ *p++ != *s++ || *p++ != *s++ || *p++ != *s++ || *p++ != *s++ ||
|
|||
|
+ *p++ != *s++;
|
|||
|
+ if (s - q == 64) {
|
|||
|
+ p--; s--;
|
|||
|
+ while((*p++ == *s++) && (s < r));
|
|||
|
+ }
|
|||
|
+ } else {
|
|||
|
+ while((*p++ == *s++) && (s < r));
|
|||
|
+ }
|
|||
|
+ len = s - q - 1;
|
|||
|
+ i += len;
|
|||
|
+
|
|||
|
+ /* at least 3 character match found; code data */
|
|||
|
+ /* encode offset */
|
|||
|
+ if (off < 64) { /* 10-bit offset; 0 <= offset < 64 */
|
|||
|
+ putbits16(obuf, 0x3c0|off, 10, &olen, &l);
|
|||
|
+ } else if (off < 320) { /* 12-bit offset; 64 <= offset < 320 */
|
|||
|
+ putbits16(obuf, 0xe00|(off-64), 12, &olen, &l);
|
|||
|
+ } else if (off < 8192) { /* 16-bit offset; 320 <= offset < 8192 */
|
|||
|
+ putbits16(obuf, 0xc000|(off-320), 16, &olen, &l);
|
|||
|
+ } else {
|
|||
|
+ /* This shouldn't happen; we return 0 what means "packet expands",
|
|||
|
+ and we send packet uncompressed. */
|
|||
|
+ if (state->debug)
|
|||
|
+ printk(KERN_DEBUG "%s%d: wrong offset value: %d\n",
|
|||
|
+ __FUNCTION__, state->unit, off);
|
|||
|
+ return 0;
|
|||
|
+ }
|
|||
|
+ /* encode length of match */
|
|||
|
+ if (len < 4) { /* length = 3 */
|
|||
|
+ putbits8(obuf, 0, 1, &olen, &l);
|
|||
|
+ } else if (len < 8) { /* 4 <= length < 8 */
|
|||
|
+ putbits8(obuf, 0x08|(len&0x03), 4, &olen, &l);
|
|||
|
+ } else if (len < 16) { /* 8 <= length < 16 */
|
|||
|
+ putbits8(obuf, 0x30|(len&0x07), 6, &olen, &l);
|
|||
|
+ } else if (len < 32) { /* 16 <= length < 32 */
|
|||
|
+ putbits8(obuf, 0xe0|(len&0x0f), 8, &olen, &l);
|
|||
|
+ } else if (len < 64) { /* 32 <= length < 64 */
|
|||
|
+ putbits16(obuf, 0x3c0|(len&0x1f), 10, &olen, &l);
|
|||
|
+ } else if (len < 128) { /* 64 <= length < 128 */
|
|||
|
+ putbits16(obuf, 0xf80|(len&0x3f), 12, &olen, &l);
|
|||
|
+ } else if (len < 256) { /* 128 <= length < 256 */
|
|||
|
+ putbits16(obuf, 0x3f00|(len&0x7f), 14, &olen, &l);
|
|||
|
+ } else if (len < 512) { /* 256 <= length < 512 */
|
|||
|
+ putbits16(obuf, 0xfe00|(len&0xff), 16, &olen, &l);
|
|||
|
+ } else if (len < 1024) { /* 512 <= length < 1024 */
|
|||
|
+ putbits24(obuf, 0x3fc00|(len&0x1ff), 18, &olen, &l);
|
|||
|
+ } else if (len < 2048) { /* 1024 <= length < 2048 */
|
|||
|
+ putbits24(obuf, 0xff800|(len&0x3ff), 20, &olen, &l);
|
|||
|
+ } else if (len < 4096) { /* 2048 <= length < 4096 */
|
|||
|
+ putbits24(obuf, 0x3ff000|(len&0x7ff), 22, &olen, &l);
|
|||
|
+ } else if (len < 8192) { /* 4096 <= length < 8192 */
|
|||
|
+ putbits24(obuf, 0xffe000|(len&0xfff), 24, &olen, &l);
|
|||
|
+ } else {
|
|||
|
+ /* This shouldn't happen; we return 0 what means "packet expands",
|
|||
|
+ and send packet uncompressed. */
|
|||
|
+ if (state->debug)
|
|||
|
+ printk(KERN_DEBUG "%s%d: wrong length of match value: %d\n",
|
|||
|
+ __FUNCTION__, state->unit, len);
|
|||
|
+ return 0;
|
|||
|
+ }
|
|||
|
+ continue;
|
|||
|
+
|
|||
|
+ literal:
|
|||
|
+ /* no match found; encode literal byte */
|
|||
|
+ if (ibuf[i] < 0x80) { /* literal byte < 0x80 */
|
|||
|
+ putbits8(obuf, (u32) ibuf[i++], 8, &olen, &l);
|
|||
|
+ } else { /* literal byte >= 0x80 */
|
|||
|
+ putbits16(obuf, (u32) (0x100|(ibuf[i++]&0x7f)), 9, &olen, &l);
|
|||
|
+ }
|
|||
|
+ }
|
|||
|
+
|
|||
|
+ /* Add remaining octets to the output */
|
|||
|
+ while(isize - i > 0) {
|
|||
|
+ if (ibuf[i] < 0x80) { /* literal byte < 0x80 */
|
|||
|
+ putbits8(obuf, (u32) ibuf[i++], 8, &olen, &l);
|
|||
|
+ } else { /* literal byte >= 0x80 */
|
|||
|
+ putbits16(obuf, (u32) (0x100|(ibuf[i++]&0x7f)), 9, &olen, &l);
|
|||
|
+ }
|
|||
|
+ }
|
|||
|
+ /* Reset unused bits of the last output octet */
|
|||
|
+ if ((l != 0) && (l != 8)) {
|
|||
|
+ putbits8(obuf, 0, l, &olen, &l);
|
|||
|
+ }
|
|||
|
+
|
|||
|
+ return (int) olen;
|
|||
|
+}
|
|||
|
+
|
|||
|
+int
|
|||
|
+mppe_compress(void *arg, unsigned char *ibuf, unsigned char *obuf,
|
|||
|
+ int isize, int osize)
|
|||
|
+{
|
|||
|
+ struct ppp_mppe_state *state = (struct ppp_mppe_state *) arg;
|
|||
|
+ int proto, olen, complen;
|
|||
|
+ unsigned char *wptr;
|
|||
|
+
|
|||
|
+ /* Check that the protocol is in the range we handle. */
|
|||
|
+ proto = PPP_PROTOCOL(ibuf);
|
|||
|
+ if (proto < 0x0021 || proto > 0x00fa)
|
|||
|
+ return 0;
|
|||
|
+
|
|||
|
+ wptr = obuf;
|
|||
|
+ /* Copy over the PPP header */
|
|||
|
+ wptr[0] = PPP_ADDRESS(ibuf);
|
|||
|
+ wptr[1] = PPP_CONTROL(ibuf);
|
|||
|
+ wptr[2] = PPP_COMP >> 8;
|
|||
|
+ wptr[3] = PPP_COMP;
|
|||
|
+ wptr += PPP_HDRLEN + MPPE_OVHD; /* Leave two octets for MPPE/MPPC bits */
|
|||
|
+
|
|||
|
+ mppe_increase_ccount(state);
|
|||
|
+
|
|||
|
+ if (state->nextflushed) {
|
|||
|
+ if (!state->stateless) {
|
|||
|
+ state->nextflushed = 0;
|
|||
|
+ }
|
|||
|
+ state->bits |= MPPE_BIT_FLUSHED;
|
|||
|
+ if (state->mppc) { /* reset history */
|
|||
|
+ state->bits |= MPPE_BIT_RESET;
|
|||
|
+ state->histptr = MPPE_HIST_LEN;
|
|||
|
+ memset(state->hist + MPPE_HIST_LEN, 0, MPPE_HIST_LEN*sizeof(u8));
|
|||
|
+ }
|
|||
|
+ }
|
|||
|
+
|
|||
|
+ if (state->mppc && !state->mppe) { /* Do only compression */
|
|||
|
+ complen = mppc_compress(state, ibuf+2, wptr, isize-2,
|
|||
|
+ osize-PPP_HDRLEN-MPPE_OVHD);
|
|||
|
+ if ((complen > isize) || (complen == 0)) {
|
|||
|
+ /* packet expands */
|
|||
|
+ state->nextflushed = 1;
|
|||
|
+ memcpy(wptr, ibuf+2, isize-2);
|
|||
|
+ olen = isize + (PPP_HDRLEN / 2) + MPPE_OVHD;
|
|||
|
+ (state->stats).inc_bytes += olen;
|
|||
|
+ (state->stats).inc_packets++;
|
|||
|
+ } else {
|
|||
|
+ state->bits |= MPPE_BIT_COMP;
|
|||
|
+ olen = complen + PPP_HDRLEN + MPPE_OVHD;
|
|||
|
+ (state->stats).comp_bytes += olen;
|
|||
|
+ (state->stats).comp_packets++;
|
|||
|
+ }
|
|||
|
+ } else {
|
|||
|
+ if (!state->mppc && state->mppe) { /* Do only encryption */
|
|||
|
+ /* read from ibuf, write to wptr, adjust for PPP_HDRLEN */
|
|||
|
+ arcfour_encrypt(&state->arcfour_context, ibuf+2, isize-2, wptr);
|
|||
|
+ state->bits |= MPPE_BIT_ENCRYPTED;
|
|||
|
+ olen = isize + (PPP_HDRLEN / 2) + MPPE_OVHD;
|
|||
|
+ (state->stats).inc_bytes += olen;
|
|||
|
+ (state->stats).inc_packets++;
|
|||
|
+ } else { /* Do compression and then encryption - RFC3078 */
|
|||
|
+ complen = mppc_compress(state, ibuf+2, wptr, isize-2,
|
|||
|
+ osize-PPP_HDRLEN-MPPE_OVHD);
|
|||
|
+ if ((complen > isize) || (complen == 0)) {
|
|||
|
+ /* packet expands */
|
|||
|
+ memcpy(wptr, ibuf+2, isize-2);
|
|||
|
+ state->nextflushed = 1;
|
|||
|
+ arcfour_encrypt(&state->arcfour_context, ibuf+2, isize-2, wptr);
|
|||
|
+ olen = isize + (PPP_HDRLEN / 2) + MPPE_OVHD;
|
|||
|
+ (state->stats).inc_bytes += olen;
|
|||
|
+ (state->stats).inc_packets++;
|
|||
|
+ } else {
|
|||
|
+ state->bits |= MPPE_BIT_COMP;
|
|||
|
+ /* Hack warning !!! RC4 implementation which we use does
|
|||
|
+ encryption "in place" - it means that input and output
|
|||
|
+ buffers can be *the same* memory area. Therefore we don't
|
|||
|
+ need to use a temporary buffer. But be careful - other
|
|||
|
+ implementations don't have to be so nice.
|
|||
|
+ I used to use ibuf as temporary buffer here, but it led
|
|||
|
+ packet sniffers into error. Thanks to Wilfried Weissmann
|
|||
|
+ for pointing that. */
|
|||
|
+ arcfour_encrypt(&state->arcfour_context, wptr, complen, wptr);
|
|||
|
+ olen = complen + PPP_HDRLEN + MPPE_OVHD;
|
|||
|
+ (state->stats).comp_bytes += olen;
|
|||
|
+ (state->stats).comp_packets++;
|
|||
|
+ }
|
|||
|
+ state->bits |= MPPE_BIT_ENCRYPTED;
|
|||
|
+ }
|
|||
|
+ }
|
|||
|
+
|
|||
|
+ /* write status bits and coherency counter into the output buffer */
|
|||
|
+ wptr = obuf + PPP_HDRLEN;
|
|||
|
+ wptr[0] = MPPE_CTRLHI(state);
|
|||
|
+ wptr[1] = MPPE_CTRLLO(state);
|
|||
|
+
|
|||
|
+ state->bits = 0;
|
|||
|
+
|
|||
|
+ (state->stats).unc_bytes += isize;
|
|||
|
+ (state->stats).unc_packets++;
|
|||
|
+
|
|||
|
+ return olen;
|
|||
|
+}
|
|||
|
+
|
|||
|
+/***************************/
|
|||
|
+/*** Decompression stuff ***/
|
|||
|
+/***************************/
|
|||
|
+static inline u32 getbits(const u8 *buf, const u32 n, u32 *i, u32 *l)
|
|||
|
+{
|
|||
|
+ static u32 m[] = {0x00, 0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f, 0x7f, 0xff};
|
|||
|
+ u32 res, ol;
|
|||
|
+
|
|||
|
+ ol = *l;
|
|||
|
+ if (*l >= n) {
|
|||
|
+ *l = (*l) - n;
|
|||
|
+ res = (buf[*i] & m[ol]) >> (*l);
|
|||
|
+ if (*l == 0) {
|
|||
|
+ *l = 8;
|
|||
|
+ (*i)++;
|
|||
|
+ }
|
|||
|
+ } else {
|
|||
|
+ *l = 8 - n + (*l);
|
|||
|
+ res = (buf[(*i)++] & m[ol]) << 8;
|
|||
|
+ res = (res | buf[*i]) >> (*l);
|
|||
|
+ }
|
|||
|
+
|
|||
|
+ return res;
|
|||
|
+}
|
|||
|
+
|
|||
|
+static inline u32 getbyte(const u8 *buf, const u32 i, const u32 l)
|
|||
|
+{
|
|||
|
+ if (l == 8) {
|
|||
|
+ return buf[i];
|
|||
|
+ } else {
|
|||
|
+ return (((buf[i] << 8) | buf[i+1]) >> l) & 0xff;
|
|||
|
+ }
|
|||
|
+}
|
|||
|
+
|
|||
|
+static inline void lamecopy(u8 *dst, u8 *src, u32 len)
|
|||
|
+{
|
|||
|
+ while (len--)
|
|||
|
+ *dst++ = *src++;
|
|||
|
+}
|
|||
|
+
|
|||
|
+static int
|
|||
|
+mppc_decompress(struct ppp_mppe_state *state, unsigned char *ibuf,
|
|||
|
+ unsigned char *obuf, int isize, int osize)
|
|||
|
+{
|
|||
|
+ u32 olen, off, len, bits, val, sig, i, l;
|
|||
|
+ u8 *history, *s;
|
|||
|
+
|
|||
|
+ history = state->hist + state->histptr;
|
|||
|
+ olen = len = i = 0;
|
|||
|
+ l = 8;
|
|||
|
+ bits = isize * 8;
|
|||
|
+ while (bits >= 8) {
|
|||
|
+ val = getbyte(ibuf, i++, l);
|
|||
|
+ if (val < 0x80) { /* literal byte < 0x80 */
|
|||
|
+ if (state->histptr < 2*MPPE_HIST_LEN) {
|
|||
|
+ /* copy uncompressed byte to the history */
|
|||
|
+ (state->hist)[(state->histptr)++] = (u8) val;
|
|||
|
+ } else {
|
|||
|
+ /* buffer overflow; drop packet */
|
|||
|
+ if (state->debug)
|
|||
|
+ printk(KERN_ERR "%s%d: trying to write outside history "
|
|||
|
+ "buffer\n", __FUNCTION__, state->unit);
|
|||
|
+ return DECOMP_ERROR;
|
|||
|
+ }
|
|||
|
+ olen++;
|
|||
|
+ bits -= 8;
|
|||
|
+ continue;
|
|||
|
+ }
|
|||
|
+
|
|||
|
+ sig = val & 0xc0;
|
|||
|
+ if (sig == 0x80) { /* literal byte >= 0x80 */
|
|||
|
+ if (state->histptr < 2*MPPE_HIST_LEN) {
|
|||
|
+ /* copy uncompressed byte to the history */
|
|||
|
+ (state->hist)[(state->histptr)++] =
|
|||
|
+ (u8) (0x80|((val&0x3f)<<1)|getbits(ibuf, 1 , &i ,&l));
|
|||
|
+ } else {
|
|||
|
+ /* buffer overflow; drop packet */
|
|||
|
+ if (state->debug)
|
|||
|
+ printk(KERN_ERR "%s%d: trying to write outside history "
|
|||
|
+ "buffer\n", __FUNCTION__, state->unit);
|
|||
|
+ return DECOMP_ERROR;
|
|||
|
+ }
|
|||
|
+ olen++;
|
|||
|
+ bits -= 9;
|
|||
|
+ continue;
|
|||
|
+ }
|
|||
|
+
|
|||
|
+ /* Not a literal byte so it must be an (offset,length) pair */
|
|||
|
+ /* decode offset */
|
|||
|
+ sig = val & 0xf0;
|
|||
|
+ if (sig == 0xf0) { /* 10-bit offset; 0 <= offset < 64 */
|
|||
|
+ off = (((val&0x0f)<<2)|getbits(ibuf, 2 , &i ,&l));
|
|||
|
+ bits -= 10;
|
|||
|
+ } else {
|
|||
|
+ if (sig == 0xe0) { /* 12-bit offset; 64 <= offset < 320 */
|
|||
|
+ off = ((((val&0x0f)<<4)|getbits(ibuf, 4 , &i ,&l))+64);
|
|||
|
+ bits -= 12;
|
|||
|
+ } else {
|
|||
|
+ if ((sig&0xe0) == 0xc0) {/* 16-bit offset; 320 <= offset < 8192 */
|
|||
|
+ off = ((((val&0x1f)<<8)|getbyte(ibuf, i++, l))+320);
|
|||
|
+ bits -= 16;
|
|||
|
+ if (off > MPPE_HIST_LEN - 1) {
|
|||
|
+ if (state->debug)
|
|||
|
+ printk(KERN_DEBUG "%s%d: too big offset value: %d\n",
|
|||
|
+ __FUNCTION__, state->unit, off);
|
|||
|
+ return DECOMP_ERROR;
|
|||
|
+ }
|
|||
|
+ } else { /* this shouldn't happen */
|
|||
|
+ if (state->debug)
|
|||
|
+ printk(KERN_DEBUG "%s%d: cannot decode offset value\n",
|
|||
|
+ __FUNCTION__, state->unit);
|
|||
|
+ return DECOMP_ERROR;
|
|||
|
+ }
|
|||
|
+ }
|
|||
|
+ }
|
|||
|
+ /* decode length of match */
|
|||
|
+ val = getbyte(ibuf, i, l);
|
|||
|
+ if ((val & 0x80) == 0x00) { /* len = 3 */
|
|||
|
+ len = 3;
|
|||
|
+ bits--;
|
|||
|
+ getbits(ibuf, 1 , &i ,&l);
|
|||
|
+ } else if ((val & 0xc0) == 0x80) { /* 4 <= len < 8 */
|
|||
|
+ len = 0x04 | ((val>>4) & 0x03);
|
|||
|
+ bits -= 4;
|
|||
|
+ getbits(ibuf, 4 , &i ,&l);
|
|||
|
+ } else if ((val & 0xe0) == 0xc0) { /* 8 <= len < 16 */
|
|||
|
+ len = 0x08 | ((val>>2) & 0x07);
|
|||
|
+ bits -= 6;
|
|||
|
+ getbits(ibuf, 6 , &i ,&l);
|
|||
|
+ } else if ((val & 0xf0) == 0xe0) { /* 16 <= len < 32 */
|
|||
|
+ len = 0x10 | (val & 0x0f);
|
|||
|
+ bits -= 8;
|
|||
|
+ i++;
|
|||
|
+ } else {
|
|||
|
+ bits -= 8;
|
|||
|
+ val = (val << 8) | getbyte(ibuf, ++i, l);
|
|||
|
+ if ((val & 0xf800) == 0xf000) { /* 32 <= len < 64 */
|
|||
|
+ len = 0x0020 | ((val >> 6) & 0x001f);
|
|||
|
+ bits -= 2;
|
|||
|
+ getbits(ibuf, 2 , &i ,&l);
|
|||
|
+ } else if ((val & 0xfc00) == 0xf800) { /* 64 <= len < 128 */
|
|||
|
+ len = 0x0040 | ((val >> 4) & 0x003f);
|
|||
|
+ bits -= 4;
|
|||
|
+ getbits(ibuf, 4 , &i ,&l);
|
|||
|
+ } else if ((val & 0xfe00) == 0xfc00) { /* 128 <= len < 256 */
|
|||
|
+ len = 0x0080 | ((val >> 2) & 0x007f);
|
|||
|
+ bits -= 6;
|
|||
|
+ getbits(ibuf, 6 , &i ,&l);
|
|||
|
+ } else if ((val & 0xff00) == 0xfe00) { /* 256 <= len < 512 */
|
|||
|
+ len = 0x0100 | (val & 0x00ff);
|
|||
|
+ bits -= 8;
|
|||
|
+ i++;
|
|||
|
+ } else {
|
|||
|
+ bits -= 8;
|
|||
|
+ val = (val << 8) | getbyte(ibuf, ++i, l);
|
|||
|
+ if ((val & 0xff8000) == 0xff0000) { /* 512 <= len < 1024 */
|
|||
|
+ len = 0x000200 | ((val >> 6) & 0x0001ff);
|
|||
|
+ bits -= 2;
|
|||
|
+ getbits(ibuf, 2 , &i ,&l);
|
|||
|
+ } else if ((val & 0xffc000) == 0xff8000) {/* 1024 <= len < 2048 */
|
|||
|
+ len = 0x000400 | ((val >> 4) & 0x0003ff);
|
|||
|
+ bits -= 4;
|
|||
|
+ getbits(ibuf, 4 , &i ,&l);
|
|||
|
+ } else if ((val & 0xffe000) == 0xffc000) {/* 2048 <= len < 4096 */
|
|||
|
+ len = 0x000800 | ((val >> 2) & 0x0007ff);
|
|||
|
+ bits -= 6;
|
|||
|
+ getbits(ibuf, 6 , &i ,&l);
|
|||
|
+ } else if ((val & 0xfff000) == 0xffe000) {/* 4096 <= len < 8192 */
|
|||
|
+ len = 0x001000 | (val & 0x000fff);
|
|||
|
+ bits -= 8;
|
|||
|
+ i++;
|
|||
|
+ } else { /* this shouldn't happen */
|
|||
|
+ if (state->debug)
|
|||
|
+ printk(KERN_DEBUG "%s%d: wrong length code: 0x%X\n",
|
|||
|
+ __FUNCTION__, state->unit, val);
|
|||
|
+ return DECOMP_ERROR;
|
|||
|
+ }
|
|||
|
+ }
|
|||
|
+ }
|
|||
|
+ s = state->hist + state->histptr;
|
|||
|
+ state->histptr += len;
|
|||
|
+ olen += len;
|
|||
|
+ if (state->histptr < 2*MPPE_HIST_LEN) {
|
|||
|
+ /* copy uncompressed bytes to the history */
|
|||
|
+
|
|||
|
+ /* In some cases len may be greater than off. It means that memory
|
|||
|
+ * areas pointed by s and s-off overlap. I used to use memmove()
|
|||
|
+ * here, because I thought that it acts as libc's version. But
|
|||
|
+ * I was wrong. I got strange errors sometimes. Wilfried suggested
|
|||
|
+ * using of byte by byte copying here and strange errors disappeared.
|
|||
|
+ */
|
|||
|
+ lamecopy(s, s-off, len);
|
|||
|
+ } else {
|
|||
|
+ /* buffer overflow; drop packet */
|
|||
|
+ if (state->debug)
|
|||
|
+ printk(KERN_ERR "%s%d: trying to write outside history "
|
|||
|
+ "buffer\n", __FUNCTION__, state->unit);
|
|||
|
+ return DECOMP_ERROR;
|
|||
|
+ }
|
|||
|
+ }
|
|||
|
+
|
|||
|
+ if (olen <= osize) {
|
|||
|
+ /* copy uncompressed packet to the output buffer */
|
|||
|
+ memcpy(obuf, history, olen);
|
|||
|
+ } else {
|
|||
|
+ /* buffer overflow; drop packet */
|
|||
|
+ if (state->debug)
|
|||
|
+ printk(KERN_ERR "%s%d: too big uncompressed packet: %d\n",
|
|||
|
+ __FUNCTION__, state->unit, olen+(PPP_HDRLEN/2));
|
|||
|
+ return DECOMP_ERROR;
|
|||
|
+ }
|
|||
|
+
|
|||
|
+ return (int) olen;
|
|||
|
+}
|
|||
|
+
|
|||
|
+int
|
|||
|
+mppe_decompress(void *arg, unsigned char *ibuf, int isize,
|
|||
|
+ unsigned char *obuf, int osize)
|
|||
|
+{
|
|||
|
+ struct ppp_mppe_state *state = (struct ppp_mppe_state *)arg;
|
|||
|
+ int seq, bits, uncomplen;
|
|||
|
+
|
|||
|
+ if (isize <= PPP_HDRLEN + MPPE_OVHD) {
|
|||
|
+ if (state->debug) {
|
|||
|
+ printk(KERN_DEBUG "%s%d: short packet (len=%d)\n", __FUNCTION__,
|
|||
|
+ state->unit, isize);
|
|||
|
+ }
|
|||
|
+ return DECOMP_ERROR;
|
|||
|
+ }
|
|||
|
+
|
|||
|
+ /* Get coherency counter and control bits from input buffer */
|
|||
|
+ seq = MPPE_CCOUNT(ibuf);
|
|||
|
+ bits = MPPE_BITS(ibuf);
|
|||
|
+
|
|||
|
+ if (state->stateless) {
|
|||
|
+ /* RFC 3078, sec 8.1. */
|
|||
|
+ mppe_increase_ccount(state);
|
|||
|
+ if ((seq != state->ccount) && state->debug)
|
|||
|
+ printk(KERN_DEBUG "%s%d: bad sequence number: %d, expected: %d\n",
|
|||
|
+ __FUNCTION__, state->unit, seq, state->ccount);
|
|||
|
+ while (seq != state->ccount)
|
|||
|
+ mppe_increase_ccount(state);
|
|||
|
+ } else {
|
|||
|
+ /* RFC 3078, sec 8.2. */
|
|||
|
+ if (state->flushexpected) { /* discard state */
|
|||
|
+ if ((bits & MPPE_BIT_FLUSHED)) { /* we received expected FLUSH bit */
|
|||
|
+ while (seq != state->ccount)
|
|||
|
+ mppe_increase_ccount(state);
|
|||
|
+ state->flushexpected = 0;
|
|||
|
+ } else /* drop packet*/
|
|||
|
+ return DECOMP_ERROR;
|
|||
|
+ } else { /* normal state */
|
|||
|
+ mppe_increase_ccount(state);
|
|||
|
+ if (seq != state->ccount) {
|
|||
|
+ /* Packet loss detected, enter the discard state. */
|
|||
|
+ if (state->debug)
|
|||
|
+ printk(KERN_DEBUG "%s%d: bad sequence number: %d, expected: %d\n",
|
|||
|
+ __FUNCTION__, state->unit, seq, state->ccount);
|
|||
|
+ state->flushexpected = 1;
|
|||
|
+ return DECOMP_ERROR;
|
|||
|
+ }
|
|||
|
+ }
|
|||
|
+ if (state->mppe && (bits & MPPE_BIT_FLUSHED)) {
|
|||
|
+ arcfour_setkey(&state->arcfour_context, state->session_key,
|
|||
|
+ state->keylen);
|
|||
|
+ }
|
|||
|
+ }
|
|||
|
+
|
|||
|
+ if (state->mppc && (bits & (MPPE_BIT_FLUSHED | MPPE_BIT_RESET))) {
|
|||
|
+ state->histptr = MPPE_HIST_LEN;
|
|||
|
+ if ((bits & MPPE_BIT_FLUSHED)) {
|
|||
|
+ memset(state->hist + MPPE_HIST_LEN, 0, MPPE_HIST_LEN*sizeof(u8));
|
|||
|
+ } else
|
|||
|
+ if ((bits & MPPE_BIT_RESET)) {
|
|||
|
+ memcpy(state->hist, state->hist+MPPE_HIST_LEN, MPPE_HIST_LEN);
|
|||
|
+ }
|
|||
|
+ }
|
|||
|
+
|
|||
|
+ /* Fill in the first part of the PPP header. The protocol field
|
|||
|
+ comes from the decompressed data. */
|
|||
|
+ obuf[0] = PPP_ADDRESS(ibuf);
|
|||
|
+ obuf[1] = PPP_CONTROL(ibuf);
|
|||
|
+ obuf += PPP_HDRLEN / 2;
|
|||
|
+
|
|||
|
+ if (state->mppe) { /* process encrypted packet */
|
|||
|
+ if ((bits & MPPE_BIT_ENCRYPTED)) {
|
|||
|
+ /* OK, packet encrypted, so decrypt it */
|
|||
|
+ if (state->mppc && (bits & MPPE_BIT_COMP)) {
|
|||
|
+ /* Hack warning !!! RC4 implementation which we use does
|
|||
|
+ decryption "in place" - it means that input and output
|
|||
|
+ buffers can be *the same* memory area. Therefore we don't
|
|||
|
+ need to use a temporary buffer. But be careful - other
|
|||
|
+ implementations don't have to be so nice. */
|
|||
|
+ arcfour_decrypt(&state->arcfour_context, ibuf+PPP_HDRLEN+MPPE_OVHD,
|
|||
|
+ isize-PPP_HDRLEN-MPPE_OVHD, ibuf+PPP_HDRLEN+MPPE_OVHD);
|
|||
|
+ uncomplen = mppc_decompress(state, ibuf+PPP_HDRLEN+MPPE_OVHD,
|
|||
|
+ obuf, isize-PPP_HDRLEN-MPPE_OVHD,
|
|||
|
+ osize-(PPP_HDRLEN/2));
|
|||
|
+ if (uncomplen == DECOMP_ERROR) {
|
|||
|
+ state->flushexpected = 1;
|
|||
|
+ return DECOMP_ERROR;
|
|||
|
+ }
|
|||
|
+ uncomplen += PPP_HDRLEN / 2;
|
|||
|
+ (state->stats).comp_bytes += isize;
|
|||
|
+ (state->stats).comp_packets++;
|
|||
|
+ } else {
|
|||
|
+ arcfour_decrypt(&state->arcfour_context, ibuf+PPP_HDRLEN+MPPE_OVHD,
|
|||
|
+ isize-PPP_HDRLEN-MPPE_OVHD, obuf);
|
|||
|
+ uncomplen = isize - (PPP_HDRLEN / 2) - MPPE_OVHD;
|
|||
|
+ (state->stats).inc_bytes += isize;
|
|||
|
+ (state->stats).inc_packets++;
|
|||
|
+ }
|
|||
|
+ } else { /* this shouldn't happen */
|
|||
|
+ if (state->debug)
|
|||
|
+ printk(KERN_ERR "%s%d: encryption negotiated but not an "
|
|||
|
+ "encrypted packet received\n", __FUNCTION__, state->unit);
|
|||
|
+ mppe_change_key(state, 0);
|
|||
|
+ state->flushexpected = 1;
|
|||
|
+ return DECOMP_ERROR;
|
|||
|
+ }
|
|||
|
+ } else {
|
|||
|
+ if (state->mppc) { /* no MPPE, only MPPC */
|
|||
|
+ if ((bits & MPPE_BIT_COMP)) {
|
|||
|
+ uncomplen = mppc_decompress(state, ibuf+PPP_HDRLEN+MPPE_OVHD,
|
|||
|
+ obuf, isize-PPP_HDRLEN-MPPE_OVHD,
|
|||
|
+ osize-(PPP_HDRLEN/2));
|
|||
|
+ if (uncomplen == DECOMP_ERROR) {
|
|||
|
+ state->flushexpected = 1;
|
|||
|
+ return DECOMP_ERROR;
|
|||
|
+ }
|
|||
|
+ uncomplen += PPP_HDRLEN / 2;
|
|||
|
+ (state->stats).comp_bytes += isize;
|
|||
|
+ (state->stats).comp_packets++;
|
|||
|
+ } else {
|
|||
|
+ memcpy(obuf, ibuf+PPP_HDRLEN+MPPE_OVHD,
|
|||
|
+ isize-PPP_HDRLEN-MPPE_OVHD);
|
|||
|
+ uncomplen = isize - (PPP_HDRLEN / 2) - MPPE_OVHD;
|
|||
|
+ (state->stats).inc_bytes += isize;
|
|||
|
+ (state->stats).inc_packets++;
|
|||
|
+ }
|
|||
|
+ } else { /* this shouldn't happen */
|
|||
|
+ if (state->debug)
|
|||
|
+ printk(KERN_ERR "%s%d: error - no MPPC nor MPPE negotiated\n",
|
|||
|
+ __FUNCTION__, state->unit);
|
|||
|
+ state->flushexpected = 1;
|
|||
|
+ return DECOMP_ERROR;
|
|||
|
+ }
|
|||
|
+ }
|
|||
|
+
|
|||
|
+ (state->stats).unc_bytes += uncomplen;
|
|||
|
+ (state->stats).unc_packets++;
|
|||
|
+
|
|||
|
+ return uncomplen;
|
|||
|
+}
|
|||
|
+
|
|||
|
+
|
|||
|
+/************************************************************
|
|||
|
+ * Module interface table
|
|||
|
+ ************************************************************/
|
|||
|
+
|
|||
|
+/* These are in ppp_generic.c */
|
|||
|
+extern int ppp_register_compressor (struct compressor *cp);
|
|||
|
+extern void ppp_unregister_compressor (struct compressor *cp);
|
|||
|
+
|
|||
|
+/*
|
|||
|
+ * Functions exported to ppp_generic.c.
|
|||
|
+ */
|
|||
|
+struct compressor ppp_mppe = {
|
|||
|
+ CI_MPPE, /* compress_proto */
|
|||
|
+ mppe_comp_alloc, /* comp_alloc */
|
|||
|
+ mppe_comp_free, /* comp_free */
|
|||
|
+ mppe_comp_init, /* comp_init */
|
|||
|
+ mppe_comp_reset, /* comp_reset */
|
|||
|
+ mppe_compress, /* compress */
|
|||
|
+ mppe_stats, /* comp_stat */
|
|||
|
+ mppe_decomp_alloc, /* decomp_alloc */
|
|||
|
+ mppe_comp_free, /* decomp_free */
|
|||
|
+ mppe_decomp_init, /* decomp_init */
|
|||
|
+ mppe_decomp_reset, /* decomp_reset */
|
|||
|
+ mppe_decompress, /* decompress */
|
|||
|
+ NULL, /* incomp */
|
|||
|
+ mppe_stats, /* decomp_stat */
|
|||
|
+};
|
|||
|
+
|
|||
|
+/*
|
|||
|
+ In case of MPPC/MPPE there is no need to process incompressible data
|
|||
|
+ because such a data is sent in MPPC/MPPE frame. Therefore the (*incomp)
|
|||
|
+ callback function isn't needed.
|
|||
|
+*/
|
|||
|
+
|
|||
|
+/************************************************************
|
|||
|
+ * Module support routines
|
|||
|
+ ************************************************************/
|
|||
|
+
|
|||
|
+int __init mppe_module_init(void)
|
|||
|
+{
|
|||
|
+ int answer = ppp_register_compressor(&ppp_mppe);
|
|||
|
+ if (answer == 0) {
|
|||
|
+ printk(KERN_INFO "MPPE/MPPC encryption/compression module registered\n");
|
|||
|
+ }
|
|||
|
+ return answer;
|
|||
|
+}
|
|||
|
+
|
|||
|
+void __exit mppe_module_cleanup(void)
|
|||
|
+{
|
|||
|
+ if (MOD_IN_USE) {
|
|||
|
+ printk (KERN_INFO "MPPE/MPPC module busy, removing delayed\n");
|
|||
|
+ } else {
|
|||
|
+ ppp_unregister_compressor (&ppp_mppe);
|
|||
|
+ printk(KERN_INFO "MPPE/MPPC encryption/compression module unregistered\n");
|
|||
|
+ }
|
|||
|
+}
|
|||
|
+
|
|||
|
+module_init(mppe_module_init);
|
|||
|
+module_exit(mppe_module_cleanup);
|
|||
|
+
|
|||
|
+MODULE_AUTHOR("Jan Dubiec <jdx@slackware.pl>");
|
|||
|
+MODULE_DESCRIPTION("MPPE/MPPC encryption/compression module for Linux");
|
|||
|
+MODULE_LICENSE("Dual BSD/GPL");
|
|||
|
diff -ruN linux-2.4.21.orig/include/linux/ppp-comp.h linux-2.4.21/include/linux/ppp-comp.h
|
|||
|
--- linux-2.4.21.orig/include/linux/ppp-comp.h 1999-08-06 19:44:11.000000000 +0200
|
|||
|
+++ linux-2.4.21/include/linux/ppp-comp.h 2003-07-15 01:45:22.000000000 +0200
|
|||
|
@@ -1,34 +1,42 @@
|
|||
|
/*
|
|||
|
* ppp-comp.h - Definitions for doing PPP packet compression.
|
|||
|
*
|
|||
|
- * Copyright (c) 1994 The Australian National University.
|
|||
|
- * All rights reserved.
|
|||
|
+ * Copyright (c) 1984 Paul Mackerras. All rights reserved.
|
|||
|
*
|
|||
|
- * Permission to use, copy, modify, and distribute this software and its
|
|||
|
- * documentation is hereby granted, provided that the above copyright
|
|||
|
- * notice appears in all copies. This software is provided without any
|
|||
|
- * warranty, express or implied. The Australian National University
|
|||
|
- * makes no representations about the suitability of this software for
|
|||
|
- * any purpose.
|
|||
|
- *
|
|||
|
- * IN NO EVENT SHALL THE AUSTRALIAN NATIONAL UNIVERSITY BE LIABLE TO ANY
|
|||
|
- * PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
|
|||
|
- * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF
|
|||
|
- * THE AUSTRALIAN NATIONAL UNIVERSITY HAVE BEEN ADVISED OF THE POSSIBILITY
|
|||
|
- * OF SUCH DAMAGE.
|
|||
|
- *
|
|||
|
- * THE AUSTRALIAN NATIONAL UNIVERSITY SPECIFICALLY DISCLAIMS ANY WARRANTIES,
|
|||
|
- * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
|
|||
|
- * AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
|
|||
|
- * ON AN "AS IS" BASIS, AND THE AUSTRALIAN NATIONAL UNIVERSITY HAS NO
|
|||
|
- * OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS,
|
|||
|
- * OR MODIFICATIONS.
|
|||
|
+ * Redistribution and use in source and binary forms, with or without
|
|||
|
+ * modification, are permitted provided that the following conditions
|
|||
|
+ * are met:
|
|||
|
*
|
|||
|
- * $Id: ppp-comp.h,v 1.6 1997/11/27 06:04:44 paulus Exp $
|
|||
|
+ * 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(s) of the authors of this software must not be used to
|
|||
|
+ * endorse or promote products derived from this software without
|
|||
|
+ * prior written permission.
|
|||
|
+ *
|
|||
|
+ * 4. Redistributions of any form whatsoever must retain the following
|
|||
|
+ * acknowledgment:
|
|||
|
+ * "This product includes software developed by Paul Mackerras
|
|||
|
+ * <paulus@samba.org>".
|
|||
|
+ *
|
|||
|
+ * THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO
|
|||
|
+ * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
|
|||
|
+ * AND FITNESS, IN NO EVENT SHALL THE AUTHORS 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.
|
|||
|
+ *
|
|||
|
+ * $Id: ppp-comp.h,v 1.10 2002/12/06 09:49:15 paulus Exp $
|
|||
|
*/
|
|||
|
|
|||
|
/*
|
|||
|
- * ==FILEVERSION 980319==
|
|||
|
+ * ==FILEVERSION 20020715==
|
|||
|
*
|
|||
|
* NOTE TO MAINTAINERS:
|
|||
|
* If you modify this file at all, please set the above date.
|
|||
|
@@ -78,7 +86,7 @@
|
|||
|
|
|||
|
/* Compress a packet */
|
|||
|
int (*compress) (void *state, unsigned char *rptr,
|
|||
|
- unsigned char *obuf, int isize, int osize);
|
|||
|
+ unsigned char *obuf, int isize, int osize);
|
|||
|
|
|||
|
/* Return compression statistics */
|
|||
|
void (*comp_stat) (void *state, struct compstat *stats);
|
|||
|
@@ -99,7 +107,7 @@
|
|||
|
|
|||
|
/* Decompress a packet. */
|
|||
|
int (*decompress) (void *state, unsigned char *ibuf, int isize,
|
|||
|
- unsigned char *obuf, int osize);
|
|||
|
+ unsigned char *obuf, int osize);
|
|||
|
|
|||
|
/* Update state for an incompressible packet received */
|
|||
|
void (*incomp) (void *state, unsigned char *ibuf, int icnt);
|
|||
|
@@ -187,6 +195,127 @@
|
|||
|
#define DEFLATE_CHK_SEQUENCE 0
|
|||
|
|
|||
|
/*
|
|||
|
+ * Definitions for MPPE.
|
|||
|
+ */
|
|||
|
+
|
|||
|
+#define CI_MPPE 18 /* config option for MPPE */
|
|||
|
+#define CILEN_MPPE 6 /* length of config option */
|
|||
|
+
|
|||
|
+#define MPPE_PAD 4 /* MPPE growth per frame */
|
|||
|
+#define MPPE_MAX_KEY_LEN 16 /* largest key length (128-bit) */
|
|||
|
+
|
|||
|
+/* option bits for ccp_options.mppe */
|
|||
|
+#define MPPE_OPT_40 0x01 /* 40 bit */
|
|||
|
+#define MPPE_OPT_128 0x02 /* 128 bit */
|
|||
|
+#define MPPE_OPT_STATEFUL 0x04 /* stateful mode */
|
|||
|
+/* unsupported opts */
|
|||
|
+#define MPPE_OPT_56 0x08 /* 56 bit */
|
|||
|
+#define MPPE_OPT_MPPC 0x10 /* MPPC compression */
|
|||
|
+#define MPPE_OPT_D 0x20 /* Unknown */
|
|||
|
+#define MPPE_OPT_UNSUPPORTED (MPPE_OPT_56|MPPE_OPT_MPPC|MPPE_OPT_D)
|
|||
|
+#define MPPE_OPT_UNKNOWN 0x40 /* Bits !defined in RFC 3078 were set */
|
|||
|
+
|
|||
|
+/*
|
|||
|
+ * This is not nice ... the alternative is a bitfield struct though.
|
|||
|
+ * And unfortunately, we cannot share the same bits for the option
|
|||
|
+ * names above since C and H are the same bit. We could do a u_int32
|
|||
|
+ * but then we have to do a htonl() all the time and/or we still need
|
|||
|
+ * to know which octet is which.
|
|||
|
+ */
|
|||
|
+#define MPPE_C_BIT 0x01 /* MPPC */
|
|||
|
+#define MPPE_D_BIT 0x10 /* Obsolete, usage unknown */
|
|||
|
+#define MPPE_L_BIT 0x20 /* 40-bit */
|
|||
|
+#define MPPE_S_BIT 0x40 /* 128-bit */
|
|||
|
+#define MPPE_M_BIT 0x80 /* 56-bit, not supported */
|
|||
|
+#define MPPE_H_BIT 0x01 /* Stateless (in a different byte) */
|
|||
|
+
|
|||
|
+/* Does not include H bit; used for least significant octet only. */
|
|||
|
+#define MPPE_ALL_BITS (MPPE_D_BIT|MPPE_L_BIT|MPPE_S_BIT|MPPE_M_BIT|MPPE_H_BIT)
|
|||
|
+
|
|||
|
+/* Build a CI from mppe opts (see RFC 3078) */
|
|||
|
+#define MPPE_OPTS_TO_CI(opts, ci) \
|
|||
|
+ do { \
|
|||
|
+ u_char *ptr = ci; /* u_char[4] */ \
|
|||
|
+ \
|
|||
|
+ /* H bit */ \
|
|||
|
+ if (opts & MPPE_OPT_STATEFUL) \
|
|||
|
+ *ptr++ = 0x0; \
|
|||
|
+ else \
|
|||
|
+ *ptr++ = MPPE_H_BIT; \
|
|||
|
+ *ptr++ = 0; \
|
|||
|
+ *ptr++ = 0; \
|
|||
|
+ \
|
|||
|
+ /* S,L bits */ \
|
|||
|
+ *ptr = 0; \
|
|||
|
+ if (opts & MPPE_OPT_128) \
|
|||
|
+ *ptr |= MPPE_S_BIT; \
|
|||
|
+ if (opts & MPPE_OPT_40) \
|
|||
|
+ *ptr |= MPPE_L_BIT; \
|
|||
|
+ /* M,D,C bits not supported */ \
|
|||
|
+ } while (/* CONSTCOND */ 0)
|
|||
|
+
|
|||
|
+/* The reverse of the above */
|
|||
|
+#define MPPE_CI_TO_OPTS(ci, opts) \
|
|||
|
+ do { \
|
|||
|
+ u_char *ptr = ci; /* u_char[4] */ \
|
|||
|
+ \
|
|||
|
+ opts = 0; \
|
|||
|
+ \
|
|||
|
+ /* H bit */ \
|
|||
|
+ if (!(ptr[0] & MPPE_H_BIT)) \
|
|||
|
+ opts |= MPPE_OPT_STATEFUL; \
|
|||
|
+ \
|
|||
|
+ /* S,L bits */ \
|
|||
|
+ if (ptr[3] & MPPE_S_BIT) \
|
|||
|
+ opts |= MPPE_OPT_128; \
|
|||
|
+ if (ptr[3] & MPPE_L_BIT) \
|
|||
|
+ opts |= MPPE_OPT_40; \
|
|||
|
+ \
|
|||
|
+ /* M,D,C bits */ \
|
|||
|
+ if (ptr[3] & MPPE_M_BIT) \
|
|||
|
+ opts |= MPPE_OPT_56; \
|
|||
|
+ if (ptr[3] & MPPE_D_BIT) \
|
|||
|
+ opts |= MPPE_OPT_D; \
|
|||
|
+ if (ptr[3] & MPPE_C_BIT) \
|
|||
|
+ opts |= MPPE_OPT_MPPC; \
|
|||
|
+ \
|
|||
|
+ /* Other bits */ \
|
|||
|
+ if (ptr[0] & ~MPPE_H_BIT) \
|
|||
|
+ opts |= MPPE_OPT_UNKNOWN; \
|
|||
|
+ if (ptr[1] || ptr[2]) \
|
|||
|
+ opts |= MPPE_OPT_UNKNOWN; \
|
|||
|
+ if (ptr[3] & ~MPPE_ALL_BITS) \
|
|||
|
+ opts |= MPPE_OPT_UNKNOWN; \
|
|||
|
+ } while (/* CONSTCOND */ 0)
|
|||
|
+
|
|||
|
+/* MPPE/MPPC definitions by J.D.*/
|
|||
|
+#define MPPE_STATELESS MPPE_H_BIT /* configuration bit H */
|
|||
|
+#define MPPE_40BIT MPPE_L_BIT /* configuration bit L */
|
|||
|
+#define MPPE_56BIT MPPE_M_BIT /* configuration bit M */
|
|||
|
+#define MPPE_128BIT MPPE_S_BIT /* configuration bit S */
|
|||
|
+#define MPPE_MPPC MPPE_C_BIT /* configuration bit C */
|
|||
|
+
|
|||
|
+/*
|
|||
|
+ * Definitions for Stac LZS.
|
|||
|
+ */
|
|||
|
+
|
|||
|
+#define CI_LZS 17 /* config option for Stac LZS */
|
|||
|
+#define CILEN_LZS 5 /* length of config option */
|
|||
|
+
|
|||
|
+#define LZS_OVHD 4 /* max. LZS overhead */
|
|||
|
+#define LZS_HIST_LEN 2048 /* LZS history size */
|
|||
|
+#define LZS_MAX_CCOUNT 0x0FFF /* max. coherency counter value */
|
|||
|
+
|
|||
|
+#define LZS_MODE_NONE 0
|
|||
|
+#define LZS_MODE_LCB 1
|
|||
|
+#define LZS_MODE_CRC 2
|
|||
|
+#define LZS_MODE_SEQ 3
|
|||
|
+#define LZS_MODE_EXT 4
|
|||
|
+
|
|||
|
+#define LZS_EXT_BIT_FLUSHED 0x80 /* bit A */
|
|||
|
+#define LZS_EXT_BIT_COMP 0x20 /* bit C */
|
|||
|
+
|
|||
|
+/*
|
|||
|
* Definitions for other, as yet unsupported, compression methods.
|
|||
|
*/
|
|||
|
|