Linux-2.6.12-rc2v2.6.12-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");
+                }
+        }
+}