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

• Lines: 449
• Date: Wed Dec 31 16:00:00 1969
• Orig file: v2.3.14/linux/net/ipv4/ip_masq_autofw.c
• Orig date: Sun Oct 4 10:21:45 1998

diff -u --recursive --new-file v2.3.14/linux/net/ipv4/ip_masq_autofw.c linux/net/ipv4/ip_masq_autofw.c
@@ -1,448 +0,0 @@
-/*
- *		IP_MASQ_AUTOFW auto forwarding module
- *
- *
- * 	$Id: ip_masq_autofw.c,v 1.3 1998/08/29 23:51:10 davem Exp $
- *
- * Author:	Richard Lynch
- *
- *	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.
- *
- *
- * Fixes:
- *	Juan Jose Ciarlante	: created this new file from ip_masq.c and ip_fw.c
- *	Juan Jose Ciarlante	: modularized 
- *	Juan Jose Ciarlante	: use GFP_KERNEL when creating entries
- *	Juan Jose Ciarlante	: call del_timer() when freeing entries (!)
- *  FIXME:
- *	- implement refcnt
- *
- */
-
-#include <linux/config.h>
-#include <linux/module.h>
-#include <linux/types.h>
-#include <linux/kernel.h>
-#include <linux/slab.h>
-#include <linux/errno.h>
-#include <asm/system.h>
-#include <linux/stat.h>
-#include <linux/proc_fs.h>
-#include <linux/if.h>
-#include <linux/init.h>
-#include <linux/ip_fw.h>
-#include <net/ip_masq.h>
-#include <net/ip_masq_mod.h>
-#include <linux/ip_masq.h>
-
-#define IP_AUTOFW_EXPIRE	     15*HZ
-
-/* WARNING: bitwise equal to ip_autofw_user  in linux/ip_masq.h */
-struct ip_autofw {
-	struct ip_autofw * next;
-	__u16 type;
-	__u16 low;
-	__u16 hidden;
-	__u16 high;
-	__u16 visible;
-	__u16 protocol;
-	__u32 lastcontact;
-	__u32 where;
-	__u16 ctlproto;
-	__u16 ctlport;
-	__u16 flags;
-	struct timer_list timer;
-};
-
-/*
- *	Debug level
- */
-#ifdef CONFIG_IP_MASQ_DEBUG
-static int debug=0;
-MODULE_PARM(debug, "i");
-#endif
-
-/*
- *	Auto-forwarding table
- */
-
-static struct ip_autofw * ip_autofw_hosts = NULL;
-static struct ip_masq_mod * mmod_self = NULL;
-
-/*
- *	Check if a masq entry should be created for a packet
- */
-
-static __inline__ struct ip_autofw * ip_autofw_check_range (__u32 where, __u16 port, __u16 protocol, int reqact)
-{
-	struct ip_autofw *af;
-	af=ip_autofw_hosts;
-	port=ntohs(port);
-	while (af) {
-		if (af->type==IP_FWD_RANGE && 
-		     port>=af->low && 
-		     port<=af->high && 
-		     protocol==af->protocol && 
-
-		     /*
-		      *		It's ok to create masq entries after 
-		      *		the timeout if we're in insecure mode 
-		      */
-		     (af->flags & IP_AUTOFW_ACTIVE || !reqact || !(af->flags & IP_AUTOFW_SECURE)) &&  
-		     (!(af->flags & IP_AUTOFW_SECURE) || af->lastcontact==where || !reqact))
-			return(af);
-		af=af->next;
-	}
-	return(NULL);
-}
-
-static __inline__ struct ip_autofw * ip_autofw_check_port (__u16 port, __u16 protocol)
-{
-	struct ip_autofw *af;
-	af=ip_autofw_hosts;
-	port=ntohs(port);
-	while (af)
-	{
-		if (af->type==IP_FWD_PORT && port==af->visible && protocol==af->protocol)
-			return(af);
-		af=af->next;
-	}
-	return(NULL);
-}
-
-static __inline__ struct ip_autofw * ip_autofw_check_direct (__u16 port, __u16 protocol)
-{
-	struct ip_autofw *af;
-	af=ip_autofw_hosts;
-	port=ntohs(port);
-	while (af)
-	{
-		if (af->type==IP_FWD_DIRECT && af->low<=port && af->high>=port)
-			return(af);
-		af=af->next;
-	}
-	return(NULL);
-}
-
-static __inline__ void ip_autofw_update_out (__u32 who, __u32 where, __u16 port, __u16 protocol)
-{
-	struct ip_autofw *af;
-	af=ip_autofw_hosts;
-	port=ntohs(port);
-	while (af)
-	{
-		if (af->type==IP_FWD_RANGE && af->ctlport==port && af->ctlproto==protocol)
-		{
-			if (af->flags & IP_AUTOFW_USETIME)
-			{
-				mod_timer(&af->timer,
-					  jiffies+IP_AUTOFW_EXPIRE);
-			}
-			af->flags|=IP_AUTOFW_ACTIVE;
-			af->lastcontact=where;
-			af->where=who;
-		}
-		af=af->next;
-	}
-}
-
-#if 0
-static __inline__ void ip_autofw_update_in (__u32 where, __u16 port, __u16 protocol)
-{
-	struct ip_autofw *af;
-	af=ip_autofw_check_range(where, port,protocol);
-	if (af)
-	{
-		mod_timer(&af->timer, jiffies+IP_AUTOFW_EXPIRE);
-	}
-}
-#endif
-
-
-static __inline__ void ip_autofw_expire(unsigned long data)
-{
-	struct ip_autofw * af;
-	af=(struct ip_autofw *) data;
-	af->flags &= ~IP_AUTOFW_ACTIVE;
-	af->timer.expires=0;
-	af->lastcontact=0;
-	if (af->flags & IP_AUTOFW_SECURE)
-		af->where=0;
-}
-
-
-
-static __inline__ int ip_autofw_add(struct ip_autofw_user * af)
-{
-	struct ip_autofw * newaf;
-	newaf = kmalloc( sizeof(struct ip_autofw), GFP_KERNEL );
-	init_timer(&newaf->timer);
-	if ( newaf == NULL ) 
-	{
-		printk("ip_autofw_add:  malloc said no\n");
-		return( ENOMEM );
-	}
-
-	MOD_INC_USE_COUNT;
-
-	memcpy(newaf, af, sizeof(struct ip_autofw_user));
-	newaf->timer.data = (unsigned long) newaf;
-	newaf->timer.function = ip_autofw_expire;
-	newaf->timer.expires = 0;
-	newaf->lastcontact=0;
-	newaf->next=ip_autofw_hosts;
-	ip_autofw_hosts=newaf;
-	ip_masq_mod_inc_nent(mmod_self);
-	return(0);
-}
-
-static __inline__ int ip_autofw_del(struct ip_autofw_user * af)
-{
-	struct ip_autofw ** af_p, *curr;
-
-	for (af_p=&ip_autofw_hosts, curr=*af_p; (curr=*af_p); af_p = &(*af_p)->next) {
-		if (af->type     == curr->type &&
-		    af->low      == curr->low &&
-		    af->high     == curr->high &&
-		    af->hidden   == curr->hidden &&
-		    af->visible  == curr->visible &&
-		    af->protocol == curr->protocol &&
-		    af->where    == curr->where &&
-		    af->ctlproto == curr->ctlproto &&
-		    af->ctlport  == curr->ctlport)
-		{
-			ip_masq_mod_dec_nent(mmod_self);
-			*af_p = curr->next;
-			if (af->flags&IP_AUTOFW_ACTIVE)
-				del_timer(&curr->timer);
-			kfree_s(curr,sizeof(struct ip_autofw));
-			MOD_DEC_USE_COUNT;
-			return 0;
-		}
-		curr=curr->next;
-	}
-	return EINVAL;
-}
-
-static __inline__ int ip_autofw_flush(void)
-{
-	struct ip_autofw * af;
-
-	while (ip_autofw_hosts)
-	{
-		af=ip_autofw_hosts;
-		ip_masq_mod_dec_nent(mmod_self);
-		ip_autofw_hosts=ip_autofw_hosts->next;
-		if (af->flags&IP_AUTOFW_ACTIVE)
-			del_timer(&af->timer);
-		kfree_s(af,sizeof(struct ip_autofw));
-		MOD_DEC_USE_COUNT;
-	}
-	return(0);
-}
-
-/*
- *	Methods for registered object
- */
-
-static int autofw_ctl(int optname, struct ip_masq_ctl *mctl, int optlen)
-{
-	struct ip_autofw_user *af = &mctl->u.autofw_user;
-
-	switch (mctl->m_cmd) {
-		case IP_MASQ_CMD_ADD:
-		case IP_MASQ_CMD_INSERT:
-			if (optlen<sizeof(*af))
-				return EINVAL;
-			return ip_autofw_add(af);
-		case IP_MASQ_CMD_DEL:
-			if (optlen<sizeof(*af))
-				return EINVAL;
-			return ip_autofw_del(af);
-		case IP_MASQ_CMD_FLUSH:
-			return ip_autofw_flush();
-
-	}
-	return EINVAL;
-}
-
-
-static int autofw_out_update(const struct sk_buff *skb, const struct iphdr *iph, struct ip_masq *ms)
-{
-	const __u16 *portp = (__u16 *)&(((char *)iph)[iph->ihl*4]);
-	/* 
-	 *	Update any ipautofw entries ...
-	 */
-
-	ip_autofw_update_out(iph->saddr, iph->daddr, portp[1], iph->protocol);
-	return IP_MASQ_MOD_NOP;
-}
-
-static struct ip_masq * autofw_out_create(const struct sk_buff *skb, const struct iphdr *iph, __u32 maddr)
-{
-	const __u16 *portp = (__u16 *)&(((char *)iph)[iph->ihl*4]);
-	/*
-	 *	If the source port is supposed to match the masq port, then
-	 *  	make it so 
-	 */
-
-	if (ip_autofw_check_direct(portp[1],iph->protocol)) {
-		return ip_masq_new(iph->protocol,
-					maddr, portp[0],
-					iph->saddr, portp[0],
-					iph->daddr, portp[1],
-					0);
-	}
-	return NULL;
-}
-
-#if 0
-static int autofw_in_update(const struct sk_buff *skb, const struct iphdr *iph, __u16 *portp, struct ip_masq *ms)
-{
-	const __u16 *portp = (__u16 *)&(((char *)iph)[iph->ihl*4]);
-	ip_autofw_update_in(iph->saddr, portp[1], iph->protocol);
-	return IP_MASQ_MOD_NOP;
-}
-#endif
-
-static int autofw_in_rule(const struct sk_buff *skb, const struct iphdr *iph)
-{
-	const __u16 *portp = (__u16 *)&(((char *)iph)[iph->ihl*4]);
-	return (ip_autofw_check_range(iph->saddr, portp[1], iph->protocol, 0)
-		|| ip_autofw_check_direct(portp[1], iph->protocol)
-		|| ip_autofw_check_port(portp[1], iph->protocol));
-}
-
-static struct ip_masq * autofw_in_create(const struct sk_buff *skb, const struct iphdr *iph, __u32 maddr)
-{
-	const __u16 *portp = (__u16 *)&(((char *)iph)[iph->ihl*4]);
-	struct ip_autofw *af;
-
-        if ((af=ip_autofw_check_range(iph->saddr, portp[1], iph->protocol, 0))) {
-		IP_MASQ_DEBUG(1-debug, "autofw_check_range HIT\n");
-		return ip_masq_new(iph->protocol,
-					maddr, portp[1],
-					af->where, portp[1],
-					iph->saddr, portp[0],
-					0);
-        } 
-        if ((af=ip_autofw_check_port(portp[1], iph->protocol)) ) {
-		IP_MASQ_DEBUG(1-debug, "autofw_check_port HIT\n");
-		return ip_masq_new(iph->protocol,
-					maddr, htons(af->visible),
-					af->where, htons(af->hidden),
-					iph->saddr, portp[0],
-					0);
-        }
-	return NULL;
-}
-
-#ifdef CONFIG_PROC_FS
-static int autofw_procinfo(char *buffer, char **start, off_t offset,
-			      int length, int unused)
-{
-	off_t pos=0, begin=0;
-	struct ip_autofw * af;
-	int len=0;
-	
-	len=sprintf(buffer,"Type Prot Low  High Vis  Hid  Where    Last     CPto CPrt Timer Flags\n"); 
-        
-        for(af = ip_autofw_hosts; af ; af = af->next)
-	{
-		len+=sprintf(buffer+len,"%4X %4X %04X-%04X/%04X %04X %08lX %08lX %04X %04X %6lu %4X\n",
-					af->type,
-					af->protocol,
-					af->low,
-					af->high,
-					af->visible,
-					af->hidden,
-					ntohl(af->where),
-					ntohl(af->lastcontact),
-					af->ctlproto,
-					af->ctlport,
-					(af->timer.expires<jiffies ? 0 : af->timer.expires-jiffies), 
-					af->flags);
-
-		pos=begin+len;
-		if(pos<offset) 
-		{
- 			len=0;
-			begin=pos;
-		}
-		if(pos>offset+length)
-			break;
-        }
-	*start=buffer+(offset-begin);
-	len-=(offset-begin);
-	if(len>length)
-		len=length;
-	return len;
-}
-
-static struct proc_dir_entry autofw_proc_entry = {
-		0, 0, NULL,
-		S_IFREG | S_IRUGO, 1, 0, 0,
-		0, &proc_net_inode_operations,
-		autofw_procinfo
-};
-
-#define proc_ent &autofw_proc_entry
-#else /* !CONFIG_PROC_FS */
-
-#define proc_ent NULL
-#endif
-
-
-#define	autofw_in_update NULL
-#define autofw_out_rule NULL
-#define autofw_mod_init NULL
-#define autofw_mod_done NULL
-
-static struct ip_masq_mod autofw_mod = {
-	NULL,			/* next */
-	NULL,			/* next_reg */
-	"autofw",		/* name */
-	ATOMIC_INIT(0),		/* nent */
-	ATOMIC_INIT(0),		/* refcnt */
-	proc_ent,
-	autofw_ctl,
-	autofw_mod_init,
-	autofw_mod_done,
-	autofw_in_rule,
-	autofw_in_update,
-	autofw_in_create,
-	autofw_out_rule,
-	autofw_out_update,
-	autofw_out_create,
-};
-
-__initfunc(int ip_autofw_init(void))
-{
-	return register_ip_masq_mod ((mmod_self=&autofw_mod));
-}
-
-int ip_autofw_done(void)
-{
-	return unregister_ip_masq_mod(&autofw_mod);
-}
-
-#ifdef MODULE
-EXPORT_NO_SYMBOLS;
-
-int init_module(void)
-{
-	if (ip_autofw_init() != 0)
-		return -EIO;
-	return 0;
-}
-
-void cleanup_module(void)
-{
-	if (ip_autofw_done() != 0)
-		printk(KERN_INFO "ip_autofw_done(): can't remove module");
-}
-
-#endif /* MODULE */