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

• Lines: 323
• Date: Wed Dec 31 16:00:00 1969
• Orig file: v2.3.14/linux/net/ipv4/ip_masq_mod.c
• Orig date: Tue Jun 29 09:22:08 1999

diff -u --recursive --new-file v2.3.14/linux/net/ipv4/ip_masq_mod.c linux/net/ipv4/ip_masq_mod.c
@@ -1,322 +0,0 @@
-/*
- *		IP_MASQ_MOD masq modules support
- *
- *
- * Author:	Juan Jose Ciarlante, <jjciarla@raiz.uncu.edu.ar>
- *
- * 	$Id: ip_masq_mod.c,v 1.6 1999/06/29 12:35:51 davem Exp $
- *
- *	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.
- *
- * Changes:
- *		Cyrus Durgin:		fixed kerneld stuff for kmod.
- */
-
-#include <linux/config.h>
-#include <linux/module.h>
-#include <linux/types.h>
-#include <linux/kernel.h>
-#include <linux/errno.h>
-#include <net/ip_masq.h>
-#include <net/ip_masq_mod.h>
-
-#include <linux/ip_masq.h>
-#ifdef CONFIG_KMOD
-#include <linux/kmod.h>
-#endif
-
-EXPORT_SYMBOL(register_ip_masq_mod);
-EXPORT_SYMBOL(unregister_ip_masq_mod);
-EXPORT_SYMBOL(ip_masq_mod_lkp_link);
-EXPORT_SYMBOL(ip_masq_mod_lkp_unlink);
-
-static spinlock_t masq_mod_lock = SPIN_LOCK_UNLOCKED;
-
-/*
- *	Base pointer for registered modules
- */
-struct ip_masq_mod * ip_masq_mod_reg_base = NULL;
-
-/*
- *	Base pointer for lookup (subset of above, a module could be
- *	registered, but it could have no active rule); will avoid
- *	unnecessary lookups.
- */
-struct ip_masq_mod * ip_masq_mod_lkp_base = NULL;
-
-int ip_masq_mod_register_proc(struct ip_masq_mod *mmod)
-{
-#ifdef CONFIG_PROC_FS        
-	int ret;
-
-	struct proc_dir_entry *ent = mmod->mmod_proc_ent;
-
-	if (!ent) 
-		return 0;
-	if (!ent->name) {
-		ent->name = mmod->mmod_name;
-		ent->namelen = strlen (mmod->mmod_name);
-	}
-	ret = ip_masq_proc_register(ent);
-	if (ret) mmod->mmod_proc_ent = NULL;
-
-	return ret;
-#else
-	return 0;
-#endif
-}
-
-void ip_masq_mod_unregister_proc(struct ip_masq_mod *mmod)
-{
-#ifdef CONFIG_PROC_FS        
-	struct proc_dir_entry *ent = mmod->mmod_proc_ent;
-	if (!ent)
-		return;
-	ip_masq_proc_unregister(ent);
-#endif
-}
-
-/*
- *	Link/unlink object for lookups
- */
-
-int ip_masq_mod_lkp_unlink(struct ip_masq_mod *mmod)
-{
-	struct ip_masq_mod **mmod_p;
-
-	write_lock_bh(&masq_mod_lock);
-
-	for (mmod_p = &ip_masq_mod_lkp_base; *mmod_p ; mmod_p = &(*mmod_p)->next)
-		if (mmod == (*mmod_p))  {
-			*mmod_p = mmod->next;
-			mmod->next = NULL;
-			write_unlock_bh(&masq_mod_lock);
-			return 0;
-		}
-
-	write_unlock_bh(&masq_mod_lock);
-	return -EINVAL;
-}
-
-int ip_masq_mod_lkp_link(struct ip_masq_mod *mmod)
-{
-	write_lock_bh(&masq_mod_lock);
-
-	mmod->next = ip_masq_mod_lkp_base;
-	ip_masq_mod_lkp_base=mmod;
-
-	write_unlock_bh(&masq_mod_lock);
-	return 0;
-}
-
-int register_ip_masq_mod(struct ip_masq_mod *mmod)
-{
-	if (!mmod) {
-		IP_MASQ_ERR("register_ip_masq_mod(): NULL arg\n");
-		return -EINVAL;
-	}
-	if (!mmod->mmod_name) {
-		IP_MASQ_ERR("register_ip_masq_mod(): NULL mmod_name\n");
-		return -EINVAL;
-	}
-	ip_masq_mod_register_proc(mmod);
-
-	mmod->next_reg = ip_masq_mod_reg_base;
-	ip_masq_mod_reg_base=mmod;
-
-	return 0;
-}
-
-int unregister_ip_masq_mod(struct ip_masq_mod *mmod)
-{
-	struct ip_masq_mod **mmod_p;
-
-	if (!mmod) {
-		IP_MASQ_ERR( "unregister_ip_masq_mod(): NULL arg\n");
-		return -EINVAL;
-	}
-
-	/*
-	 * 	Only allow unregistration if it is not referenced
-	 */
-	if (atomic_read(&mmod->refcnt))  {
-		IP_MASQ_ERR( "unregister_ip_masq_mod(): is in use by %d guys. failed\n",
-				atomic_read(&mmod->refcnt));
-		return -EINVAL;
-	}
-
-	/*	
-	 *	Must be already unlinked from lookup list
-	 */
-	if (mmod->next) {
-		IP_MASQ_WARNING("MASQ: unregistering \"%s\" while in lookup list.fixed.",
-			mmod->mmod_name);
-		ip_masq_mod_lkp_unlink(mmod);
-	}
-
-	for (mmod_p = &ip_masq_mod_reg_base; *mmod_p ; mmod_p = &(*mmod_p)->next_reg)
-		if (mmod == (*mmod_p))  {
-			ip_masq_mod_unregister_proc(mmod);
-			*mmod_p = mmod->next_reg;
-			return 0;
-		}
-
-	IP_MASQ_ERR("unregister_ip_masq_mod(%s): not linked \n", mmod->mmod_name);
-	return -EINVAL;
-}
-
-int ip_masq_mod_in_rule(const struct sk_buff *skb, const struct iphdr *iph)
-{
-	struct ip_masq_mod *mmod;
-	int ret = IP_MASQ_MOD_NOP;
-
-	for (mmod=ip_masq_mod_lkp_base;mmod;mmod=mmod->next) {
-		if (!mmod->mmod_in_rule) continue;
-		switch (ret=mmod->mmod_in_rule(skb, iph)) {
-			case IP_MASQ_MOD_NOP:
-				continue;
-			case IP_MASQ_MOD_ACCEPT:
-			case IP_MASQ_MOD_REJECT:
-				goto out;
-		}
-	}
-out:
-	return ret;
-}
-
-int ip_masq_mod_out_rule(const struct sk_buff *skb, const struct iphdr *iph)
-{
-	struct ip_masq_mod *mmod;
-	int ret = IP_MASQ_MOD_NOP;
-
-	for (mmod=ip_masq_mod_lkp_base;mmod;mmod=mmod->next) {
-		if (!mmod->mmod_out_rule) continue;
-		switch (ret=mmod->mmod_out_rule(skb, iph)) {
-			case IP_MASQ_MOD_NOP:
-				continue;
-			case IP_MASQ_MOD_ACCEPT:
-			case IP_MASQ_MOD_REJECT:
-				goto out;
-		}
-	}
-out:
-	return ret;
-}
-
-struct ip_masq * ip_masq_mod_in_create(const struct sk_buff *skb, const struct iphdr *iph, __u32 maddr)
-{
-	struct ip_masq_mod *mmod;
-	struct ip_masq *ms = NULL;
-
-	for (mmod=ip_masq_mod_lkp_base;mmod;mmod=mmod->next) {
-		if (!mmod->mmod_in_create) continue;
-		if ((ms=mmod->mmod_in_create(skb, iph, maddr))) {
-			goto out;
-		}
-	}
-out:
-	return ms;
-}
-
-struct ip_masq * ip_masq_mod_out_create(const struct sk_buff *skb, const struct iphdr *iph,  __u32 maddr)
-{
-	struct ip_masq_mod *mmod;
-	struct ip_masq *ms = NULL;
-
-	for (mmod=ip_masq_mod_lkp_base;mmod;mmod=mmod->next) {
-		if (!mmod->mmod_out_create) continue;
-		if ((ms=mmod->mmod_out_create(skb, iph, maddr))) {
-			goto out;
-		}
-	}
-out:
-	return ms;
-}
-
-int ip_masq_mod_in_update(const struct sk_buff *skb, const struct iphdr *iph, struct ip_masq *ms)
-{
-	struct ip_masq_mod *mmod;
-	int ret = IP_MASQ_MOD_NOP;
-
-	for (mmod=ip_masq_mod_lkp_base;mmod;mmod=mmod->next) {
-		if (!mmod->mmod_in_update) continue;
-		switch (ret=mmod->mmod_in_update(skb, iph, ms)) {
-			case IP_MASQ_MOD_NOP:
-				continue;
-			case IP_MASQ_MOD_ACCEPT:
-			case IP_MASQ_MOD_REJECT:
-				goto out;
-		}
-	}
-out:
-	return ret;
-}
-
-int ip_masq_mod_out_update(const struct sk_buff *skb, const struct iphdr *iph, struct ip_masq *ms)
-{
-	struct ip_masq_mod *mmod;
-	int ret = IP_MASQ_MOD_NOP;
-
-	for (mmod=ip_masq_mod_lkp_base;mmod;mmod=mmod->next) {
-		if (!mmod->mmod_out_update) continue;
-		switch (ret=mmod->mmod_out_update(skb, iph, ms)) {
-			case IP_MASQ_MOD_NOP:
-				continue;
-			case IP_MASQ_MOD_ACCEPT:
-			case IP_MASQ_MOD_REJECT:
-				goto out;
-		}
-	}
-out:
-	return ret;
-}
-
-struct ip_masq_mod * ip_masq_mod_getbyname(const char *mmod_name)
-{
-	struct ip_masq_mod * mmod;
-
-	IP_MASQ_DEBUG(1, "searching mmod_name \"%s\"\n", mmod_name);
-	
-	for (mmod=ip_masq_mod_reg_base; mmod ; mmod=mmod->next_reg) {
-		if (mmod->mmod_ctl && *(mmod_name)
-				&& (strcmp(mmod_name, mmod->mmod_name)==0)) {
-			/* HIT */
-			return mmod;
-		}
-	}
-	return NULL;
-}
-
-/*
- *	Module control entry
- */
-int ip_masq_mod_ctl(int optname, struct ip_masq_ctl *mctl, int optlen)
-{
-	struct ip_masq_mod * mmod;
-#ifdef CONFIG_KMOD
-	char kmod_name[IP_MASQ_TNAME_MAX+8];
-#endif
-	/* tappo */
-	mctl->m_tname[IP_MASQ_TNAME_MAX-1] = 0;
-
-	mmod = ip_masq_mod_getbyname(mctl->m_tname);
-	if (mmod)
-		return mmod->mmod_ctl(optname, mctl, optlen);
-#ifdef CONFIG_KMOD
-	sprintf(kmod_name,"ip_masq_%s", mctl->m_tname);
-
-	IP_MASQ_DEBUG(1, "About to request \"%s\" module\n", kmod_name);
-
-	/* 
-	 *	Let sleep for a while ...
-	 */
-	request_module(kmod_name);
-	mmod = ip_masq_mod_getbyname(mctl->m_tname);
-	if (mmod)
-		return mmod->mmod_ctl(optname, mctl, optlen);
-#endif
-	return ESRCH;
-}