patch-2.0.30 linux/net/ipv4/ip_masq_cuseeme.c

• Lines: 181
• Date: Tue Apr 8 08:47:47 1997
• Orig file: v2.0.29/linux/net/ipv4/ip_masq_cuseeme.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.0.29/linux/net/ipv4/ip_masq_cuseeme.c linux/net/ipv4/ip_masq_cuseeme.c
@@ -0,0 +1,180 @@
+/*
+ *		IP_MASQ_FTP CUSeeMe masquerading module
+ *
+ *
+ * Version:	@(#)ip_masq_cuseeme.c 0.02   07/23/96
+ *
+ * Author:	Richard Lynch
+ *		
+ *
+ * Fixes:
+ *	Richard Lynch     	:	Updated patch to conform to new module
+ *					specifications
+ *	Nigel Metheringham	:	Multiple port support
+ *	
+ *
+ *
+ *	This program 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.
+ *	
+ * Multiple Port Support
+ *	The helper can be made to handle up to MAX_MASQ_APP_PORTS (normally 12)
+ *	with the port numbers being defined at module load time.  The module
+ *	uses the symbol "ports" to define a list of monitored ports, which can
+ *	be specified on the insmod command line as
+ *		ports=x1,x2,x3...
+ *	where x[n] are integer port numbers.  This option can be put into
+ *	/etc/conf.modules (or /etc/modules.conf depending on your config)
+ *	where modload will pick it up should you use modload to load your
+ *	modules.
+ *	
+ */
+
+#include <linux/module.h>
+#include <asm/system.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/skbuff.h>
+#include <linux/in.h>
+#include <linux/ip.h>
+#include <net/protocol.h>
+#include <net/udp.h>
+#include <net/ip_masq.h>
+
+#ifndef DEBUG_CONFIG_IP_MASQ_CUSEEME
+#define DEBUG_CONFIG_IP_MASQ_CUSEEME 0
+#endif
+
+/* 
+ * List of ports (up to MAX_MASQ_APP_PORTS) to be handled by helper
+ * First port is set to the default port.
+ */
+int ports[MAX_MASQ_APP_PORTS] = {7648}; /* I rely on the trailing items being set to zero */
+struct ip_masq_app *masq_incarnations[MAX_MASQ_APP_PORTS];
+
+static int
+masq_cuseeme_init_1 (struct ip_masq_app *mapp, struct ip_masq *ms)
+{
+        MOD_INC_USE_COUNT;
+        return 0;
+}
+
+static int
+masq_cuseeme_done_1 (struct ip_masq_app *mapp, struct ip_masq *ms)
+{
+        MOD_DEC_USE_COUNT;
+        return 0;
+}
+
+int
+masq_cuseeme_out (struct ip_masq_app *mapp, struct ip_masq *ms, struct sk_buff **skb_p, struct device *dev)
+{
+	struct sk_buff *skb = *skb_p;
+	struct iphdr *iph = skb->h.iph;
+	struct udphdr *uh = (struct udphdr *)&(((char *)iph)[iph->ihl*4]);
+	struct cu_header {
+		char dest[8];
+		short family;
+		u_short port;
+		u_long addr;
+	} *cu_head;
+	char *data=(char *)&uh[1];
+	
+	if (skb->len - ((unsigned char *) data - skb->h.raw) > 16)
+	{
+		cu_head         = (struct cu_header *) data;
+/*		printk("CUSeeMe orig: %lX:%X\n",ntohl(cu_head->addr),ntohs(cu_head->port));*/
+		cu_head->port   = ms->mport;
+		cu_head->addr = (u_long) dev->pa_addr;
+	}
+	return 0;
+}
+
+struct ip_masq_app ip_masq_cuseeme = {
+        NULL,			/* next */
+        "cuseeme",
+        0,                      /* type */
+        0,                      /* n_attach */
+        masq_cuseeme_init_1,	/* ip_masq_init_1 */
+        masq_cuseeme_done_1,	/* ip_masq_done_1 */
+        masq_cuseeme_out,	/* pkt_out */
+        NULL                    /* pkt_in */
+};
+
+
+/*
+ * 	ip_masq_cuseeme initialization
+ */
+
+int ip_masq_cuseeme_init(void)
+{
+	int i, j;
+
+	for (i=0; (i<MAX_MASQ_APP_PORTS); i++) {
+		if (ports[i]) {
+			if ((masq_incarnations[i] = kmalloc(sizeof(struct ip_masq_app),
+							    GFP_KERNEL)) == NULL)
+				return -ENOMEM;
+			memcpy(masq_incarnations[i], &ip_masq_cuseeme, sizeof(struct ip_masq_app));
+			if ((j = register_ip_masq_app(masq_incarnations[i], 
+						      IPPROTO_TCP, 
+						      ports[i]))) {
+				return j;
+			}
+#if DEBUG_CONFIG_IP_MASQ_CUSEEME
+			printk("CuSeeMe: loaded support on port[%d] = %d\n",
+			       i, ports[i]);
+#endif
+		} else {
+			/* To be safe, force the incarnation table entry to NULL */
+			masq_incarnations[i] = NULL;
+		}
+	}
+	return 0;
+}
+
+/*
+ * 	ip_masq_cuseeme fin.
+ */
+
+int ip_masq_cuseeme_done(void)
+{
+	int i, j, k;
+
+	k=0;
+	for (i=0; (i<MAX_MASQ_APP_PORTS); i++) {
+		if (masq_incarnations[i]) {
+			if ((j = unregister_ip_masq_app(masq_incarnations[i]))) {
+				k = j;
+			} else {
+				kfree(masq_incarnations[i]);
+				masq_incarnations[i] = NULL;
+#if DEBUG_CONFIG_IP_MASQ_CUSEEME
+				printk("CuSeeMe: unloaded support on port[%d] = %d\n",
+				       i, ports[i]);
+#endif
+			}
+		}
+	}
+	return k;
+}
+
+#ifdef MODULE
+
+int init_module(void)
+{
+        if (ip_masq_cuseeme_init() != 0)
+                return -EIO;
+        register_symtab(0);
+        return 0;
+}
+
+void cleanup_module(void)
+{
+        if (ip_masq_cuseeme_done() != 0)
+                printk("ip_masq_cuseeme: can't remove module");
+}
+
+#endif /* MODULE */