patch-2.3.15 linux/net/ipv4/ip_masq_vdolive.c

• Lines: 299
• Date: Wed Dec 31 16:00:00 1969
• Orig file: v2.3.14/linux/net/ipv4/ip_masq_vdolive.c
• Orig date: Wed Jun 9 14:45:37 1999

diff -u --recursive --new-file v2.3.14/linux/net/ipv4/ip_masq_vdolive.c linux/net/ipv4/ip_masq_vdolive.c
@@ -1,298 +0,0 @@
-/*
- *		IP_MASQ_VDOLIVE  - VDO Live masquerading module
- *
- *
- * Version:	@(#)$Id: ip_masq_vdolive.c,v 1.6 1999/06/09 08:29:03 davem Exp $
- *
- * Author:	Nigel Metheringham <Nigel.Metheringham@ThePLAnet.net>
- *		PLAnet Online Ltd
- *
- * Fixes:	Minor changes for 2.1 by
- *		Steven Clarke <Steven.Clarke@ThePlanet.Net>, Planet Online Ltd
- *
- *              Add missing #include <linux/string.h>
- *              Horst von Brand <vonbrand@sleipnir.valparaiso.cl>
- *
- *	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.
- *
- * Thanks:
- *	Thank you to VDOnet Corporation for allowing me access to
- *	a protocol description without an NDA.  This means that
- *	this module can be distributed as source - a great help!
- *	
- */
-
-#include <linux/config.h>
-#include <linux/module.h>
-#include <linux/types.h>
-#include <linux/string.h>
-#include <linux/kernel.h>
-#include <asm/system.h>
-#include <linux/skbuff.h>
-#include <linux/in.h>
-#include <linux/ip.h>
-#include <linux/init.h>
-#include <net/protocol.h>
-#include <net/tcp.h>
-#include <net/ip_masq.h>
-
-struct vdolive_priv_data {
-	/* Ports used */
-	unsigned short	origport;
-	unsigned short	masqport;
-	/* State of decode */
-	unsigned short	state;
-};
-
-/* 
- * List of ports (up to MAX_MASQ_APP_PORTS) to be handled by helper
- * First port is set to the default port.
- */
-static int ports[MAX_MASQ_APP_PORTS] = {7000}; /* I rely on the trailing items being set to zero */
-struct ip_masq_app *masq_incarnations[MAX_MASQ_APP_PORTS];
-
-/*
- *     Debug level
- */
-#ifdef CONFIG_IP_MASQ_DEBUG
-static int debug=0;
-MODULE_PARM(debug, "i");
-#endif
-
-MODULE_PARM(ports, "1-" __MODULE_STRING(MAX_MASQ_APP_PORTS) "i");
-
-static int
-masq_vdolive_init_1 (struct ip_masq_app *mapp, struct ip_masq *ms)
-{
-	MOD_INC_USE_COUNT;
-	if ((ms->app_data = kmalloc(sizeof(struct vdolive_priv_data),
-				    GFP_ATOMIC)) == NULL) 
-		IP_MASQ_DEBUG(1-debug, "VDOlive: No memory for application data\n");
-	else 
-	{
-		struct vdolive_priv_data *priv = 
-			(struct vdolive_priv_data *)ms->app_data;
-		priv->origport = 0;
-		priv->masqport = 0;
-		priv->state = 0;
-	}
-        return 0;
-}
-
-static int
-masq_vdolive_done_1 (struct ip_masq_app *mapp, struct ip_masq *ms)
-{
-        MOD_DEC_USE_COUNT;
-	if (ms->app_data)
-		kfree_s(ms->app_data, sizeof(struct vdolive_priv_data));
-        return 0;
-}
-
-int
-masq_vdolive_out (struct ip_masq_app *mapp, struct ip_masq *ms, struct sk_buff **skb_p, __u32 maddr)
-{
-        struct sk_buff *skb;
-	struct iphdr *iph;
-	struct tcphdr *th;
-	char *data, *data_limit;
-	unsigned int tagval;	/* This should be a 32 bit quantity */
-	struct ip_masq *n_ms;
-	struct vdolive_priv_data *priv = 
-		(struct vdolive_priv_data *)ms->app_data;
-
-	/* This doesn't work at all if no priv data was allocated on startup */
-	if (!priv)
-		return 0;
-
-	/* Everything running correctly already */
-	if (priv->state == 3)
-		return 0;
-
-        skb = *skb_p;
-	iph = skb->nh.iph;
-        th = (struct tcphdr *)&(((char *)iph)[iph->ihl*4]);
-        data = (char *)&th[1];
-
-        data_limit = skb->h.raw + skb->len;
-
-	if (data+8 > data_limit) {
-		IP_MASQ_DEBUG(1-debug, "VDOlive: packet too short for ID %p %p\n", data, data_limit);
-		return 0;
-	}
-	memcpy(&tagval, data+4, 4);
-	IP_MASQ_DEBUG(1-debug, "VDOlive: packet seen, tag %ld, in initial state %d\n", ntohl(tagval), priv->state);
-
-	/* Check for leading packet ID */
-	if ((ntohl(tagval) != 6) && (ntohl(tagval) != 1)) {
-		IP_MASQ_DEBUG(1-debug, "VDOlive: unrecognised tag %ld, in initial state %d\n", ntohl(tagval), priv->state);
-		return 0;
-	}
-		
-
-	/* Check packet is long enough for data - ignore if not */
-	if ((ntohl(tagval) == 6) && (data+36 > data_limit)) {
-		IP_MASQ_DEBUG(1-debug, "VDOlive: initial packet too short %p %p\n", data, data_limit);
-		return 0;
-	} else if ((ntohl(tagval) == 1) && (data+20 > data_limit)) {
-		IP_MASQ_DEBUG(1-debug,"VDOlive: secondary packet too short %p %p\n", data, data_limit);
-		return 0;
-	}
-
-	/* Adjust data pointers */
-	/*
-	 * I could check the complete protocol version tag 
-	 * in here however I am just going to look for the
-	 * "VDO Live" tag in the hope that this part will
-	 * remain constant even if the version changes
-	 */
-	if (ntohl(tagval) == 6) {
-		data += 24;
-		IP_MASQ_DEBUG(1-debug, "VDOlive: initial packet found\n");
-	} else {
-		data += 8;
-		IP_MASQ_DEBUG(1-debug, "VDOlive: secondary packet found\n");
-	}
-
-	if (memcmp(data, "VDO Live", 8) != 0) {
-		IP_MASQ_DEBUG(1-debug,"VDOlive: did not find tag\n");
-		return 0;
-	}
-	/* 
-	 * The port number is the next word after the tag.
-	 * VDOlive encodes all of these values
-	 * in 32 bit words, so in this case I am
-	 * skipping the first 2 bytes of the next
-	 * word to get to the relevant 16 bits
-	 */
-	data += 10;
-
-	/*
-	 * If we have not seen the port already,
-	 * set the masquerading tunnel up
-	 */
-	if (!priv->origport) {
-		memcpy(&priv->origport, data, 2);
-		IP_MASQ_DEBUG(1-debug, "VDOlive: found port %d\n", ntohs(priv->origport));
-
-		/* Open up a tunnel */
-		n_ms = ip_masq_new(IPPROTO_UDP,
-				   maddr, 0,
-				   ms->saddr, priv->origport,
-				   ms->daddr, 0,
-				   IP_MASQ_F_NO_DPORT);
-					
-		if (n_ms==NULL) {
-		        ip_masq_put(n_ms);
-			IP_MASQ_DEBUG(1-debug, "VDOlive: unable to build UDP tunnel for %x:%x\n", ms->saddr, priv->origport);
-			/* Leave state as unset */
-			priv->origport = 0;
-			return 0;
-		}
-		ip_masq_listen(n_ms);
-
-		ip_masq_put(ms);
-		priv->masqport = n_ms->mport;
-	} else if (memcmp(data, &(priv->origport), 2)) {
-		IP_MASQ_DEBUG(1-debug, "VDOlive: ports do not match\n");
-		/* Write the port in anyhow!!! */
-	}
-
-	/*
-	 * Write masq port into packet
-	 */
-	memcpy(data, &(priv->masqport), 2);
-	IP_MASQ_DEBUG(1-debug, "VDOlive: rewrote port %d to %d, server %08X\n", ntohs(priv->origport), ntohs(priv->masqport), ms->saddr);
-
-	/*
-	 * Set state bit to make which bit has been done
-	 */
-
-	priv->state |= (ntohl(tagval) == 6) ? 1 : 2;
-
-	return 0;
-}
-
-
-struct ip_masq_app ip_masq_vdolive = {
-        NULL,			/* next */
-	"VDOlive",	       	/* name */
-        0,                      /* type */
-        0,                      /* n_attach */
-        masq_vdolive_init_1,	/* ip_masq_init_1 */
-        masq_vdolive_done_1,	/* ip_masq_done_1 */
-        masq_vdolive_out,	/* pkt_out */
-        NULL                    /* pkt_in */
-};
-
-/*
- * 	ip_masq_vdolive initialization
- */
-
-__initfunc(int ip_masq_vdolive_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_vdolive, sizeof(struct ip_masq_app));
-			if ((j = register_ip_masq_app(masq_incarnations[i], 
-						      IPPROTO_TCP, 
-						      ports[i]))) {
-				return j;
-			}
-			IP_MASQ_DEBUG(1-debug, "RealAudio: loaded support on port[%d] = %d\n", i, ports[i]);
-		} else {
-			/* To be safe, force the incarnation table entry to NULL */
-			masq_incarnations[i] = NULL;
-		}
-	}
-	return 0;
-}
-
-/*
- * 	ip_masq_vdolive fin.
- */
-
-int ip_masq_vdolive_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;
-				IP_MASQ_DEBUG(1-debug,"VDOlive: unloaded support on port[%d] = %d\n", i, ports[i]);
-			}
-		}
-	}
-	return k;
-}
-
-
-#ifdef MODULE
-EXPORT_NO_SYMBOLS;
-
-int init_module(void)
-{
-        if (ip_masq_vdolive_init() != 0)
-                return -EIO;
-        return 0;
-}
-
-void cleanup_module(void)
-{
-        if (ip_masq_vdolive_done() != 0)
-                IP_MASQ_DEBUG(1-debug, "ip_masq_vdolive: can't remove module");
-}
-
-#endif /* MODULE */