Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 231 insertions, 0 deletions

diff --git a/net/x25/x25_facilities.c b/net/x25/x25_facilities.c
new file mode 100644
index 000000000000..a21bdb95f9a8
--- /dev/null
+++ b/net/x25/x25_facilities.c
@@ -0,0 +1,231 @@
+/*
+ *	X.25 Packet Layer release 002
+ *
+ *	This is ALPHA test software. This code may break your machine,
+ *	randomly fail to work with new releases, misbehave and/or generally
+ *	screw up. It might even work. 
+ *
+ *	This code REQUIRES 2.1.15 or higher
+ *
+ *	This module:
+ *		This module is free software; you can redistribute it and/or
+ *		modify it under the terms of the GNU General Public License
+ *		as published by the Free Software Foundation; either version
+ *		2 of the License, or (at your option) any later version.
+ *
+ *	History
+ *	X.25 001	Split from x25_subr.c
+ *	mar/20/00	Daniela Squassoni Disabling/enabling of facilities 
+ *					  negotiation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/skbuff.h>
+#include <net/sock.h>
+#include <net/x25.h>
+
+/*
+ *	Parse a set of facilities into the facilities structure. Unrecognised
+ *	facilities are written to the debug log file.
+ */
+int x25_parse_facilities(struct sk_buff *skb,
+			 struct x25_facilities *facilities,
+			 unsigned long *vc_fac_mask)
+{
+	unsigned char *p = skb->data;
+	unsigned int len = *p++;
+
+	*vc_fac_mask = 0;
+
+	while (len > 0) {
+		switch (*p & X25_FAC_CLASS_MASK) {
+		case X25_FAC_CLASS_A:
+			switch (*p) {
+			case X25_FAC_REVERSE:
+				facilities->reverse = p[1] & 0x01;
+				*vc_fac_mask |= X25_MASK_REVERSE;
+				break;
+			case X25_FAC_THROUGHPUT:
+				facilities->throughput = p[1];
+				*vc_fac_mask |= X25_MASK_THROUGHPUT;
+				break;
+			default:
+				printk(KERN_DEBUG "X.25: unknown facility "
+				       "%02X, value %02X\n",
+				       p[0], p[1]);
+				break;
+			}
+			p   += 2;
+			len -= 2;
+			break;
+		case X25_FAC_CLASS_B:
+			switch (*p) {
+			case X25_FAC_PACKET_SIZE:
+				facilities->pacsize_in  = p[1];
+				facilities->pacsize_out = p[2];
+				*vc_fac_mask |= X25_MASK_PACKET_SIZE;
+				break;
+			case X25_FAC_WINDOW_SIZE:
+				facilities->winsize_in  = p[1];
+				facilities->winsize_out = p[2];
+				*vc_fac_mask |= X25_MASK_WINDOW_SIZE;
+				break;
+			default:
+				printk(KERN_DEBUG "X.25: unknown facility "
+				       "%02X, values %02X, %02X\n",
+				       p[0], p[1], p[2]);
+				break;
+			}
+			p   += 3;
+			len -= 3;
+			break;
+		case X25_FAC_CLASS_C:
+			printk(KERN_DEBUG "X.25: unknown facility %02X, "
+			       "values %02X, %02X, %02X\n",
+			       p[0], p[1], p[2], p[3]);
+			p   += 4;
+			len -= 4;
+			break;
+		case X25_FAC_CLASS_D:
+			printk(KERN_DEBUG "X.25: unknown facility %02X, "
+			       "length %d, values %02X, %02X, %02X, %02X\n",
+			       p[0], p[1], p[2], p[3], p[4], p[5]);
+			len -= p[1] + 2;
+			p   += p[1] + 2;
+			break;
+		}
+	}
+
+	return p - skb->data;
+}
+
+/*
+ *	Create a set of facilities.
+ */
+int x25_create_facilities(unsigned char *buffer,
+			  struct x25_facilities *facilities,
+			  unsigned long facil_mask)
+{
+	unsigned char *p = buffer + 1;
+	int len;
+
+	if (!facil_mask) {
+		/*
+		 * Length of the facilities field in call_req or
+		 * call_accept packets
+		 */
+		buffer[0] = 0;
+		len = 1; /* 1 byte for the length field */
+		return len;
+	}
+
+	if (facilities->reverse && (facil_mask & X25_MASK_REVERSE)) {
+		*p++ = X25_FAC_REVERSE;
+		*p++ = !!facilities->reverse;
+	}
+
+	if (facilities->throughput && (facil_mask & X25_MASK_THROUGHPUT)) {
+		*p++ = X25_FAC_THROUGHPUT;
+		*p++ = facilities->throughput;
+	}
+
+	if ((facilities->pacsize_in || facilities->pacsize_out) &&
+	    (facil_mask & X25_MASK_PACKET_SIZE)) {
+		*p++ = X25_FAC_PACKET_SIZE;
+		*p++ = facilities->pacsize_in ? : facilities->pacsize_out;
+		*p++ = facilities->pacsize_out ? : facilities->pacsize_in;
+	}
+
+	if ((facilities->winsize_in || facilities->winsize_out) &&
+	    (facil_mask & X25_MASK_WINDOW_SIZE)) {
+		*p++ = X25_FAC_WINDOW_SIZE;
+		*p++ = facilities->winsize_in ? : facilities->winsize_out;
+		*p++ = facilities->winsize_out ? : facilities->winsize_in;
+	}
+
+	len       = p - buffer;
+	buffer[0] = len - 1;
+
+	return len;
+}
+
+/*
+ *	Try to reach a compromise on a set of facilities.
+ *
+ *	The only real problem is with reverse charging.
+ */
+int x25_negotiate_facilities(struct sk_buff *skb, struct sock *sk,
+			     struct x25_facilities *new)
+{
+	struct x25_sock *x25 = x25_sk(sk);
+	struct x25_facilities *ours = &x25->facilities;
+	struct x25_facilities theirs;
+	int len;
+
+	memset(&theirs, 0, sizeof(theirs));
+	memcpy(new, ours, sizeof(*new));
+
+	len = x25_parse_facilities(skb, &theirs, &x25->vc_facil_mask);
+
+	/*
+	 *	They want reverse charging, we won't accept it.
+	 */
+	if (theirs.reverse && ours->reverse) {
+		SOCK_DEBUG(sk, "X.25: rejecting reverse charging request");
+		return -1;
+	}
+
+	new->reverse = theirs.reverse;
+
+	if (theirs.throughput) {
+		if (theirs.throughput < ours->throughput) {
+			SOCK_DEBUG(sk, "X.25: throughput negotiated down");
+			new->throughput = theirs.throughput;
+		}
+	}
+
+	if (theirs.pacsize_in && theirs.pacsize_out) {
+		if (theirs.pacsize_in < ours->pacsize_in) {
+			SOCK_DEBUG(sk, "X.25: packet size inwards negotiated down");
+			new->pacsize_in = theirs.pacsize_in;
+		}
+		if (theirs.pacsize_out < ours->pacsize_out) {
+			SOCK_DEBUG(sk, "X.25: packet size outwards negotiated down");
+			new->pacsize_out = theirs.pacsize_out;
+		}
+	}
+
+	if (theirs.winsize_in && theirs.winsize_out) {
+		if (theirs.winsize_in < ours->winsize_in) {
+			SOCK_DEBUG(sk, "X.25: window size inwards negotiated down");
+			new->winsize_in = theirs.winsize_in;
+		}
+		if (theirs.winsize_out < ours->winsize_out) {
+			SOCK_DEBUG(sk, "X.25: window size outwards negotiated down");
+			new->winsize_out = theirs.winsize_out;
+		}
+	}
+
+	return len;
+}
+
+/*
+ *	Limit values of certain facilities according to the capability of the 
+ *      currently attached x25 link.
+ */
+void x25_limit_facilities(struct x25_facilities *facilities,
+			  struct x25_neigh *nb)
+{
+
+	if (!nb->extended) {
+		if (facilities->winsize_in  > 7) {
+			printk(KERN_DEBUG "X.25: incoming winsize limited to 7\n");
+			facilities->winsize_in = 7;
+		}
+		if (facilities->winsize_out > 7) {
+			facilities->winsize_out = 7;
+			printk( KERN_DEBUG "X.25: outgoing winsize limited to 7\n");
+		}
+	}
+}