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

• Lines: 468
• Date: Wed Dec 31 16:00:00 1969
• Orig file: v2.3.14/linux/net/ipv4/ip_masq_user.c
• Orig date: Wed Aug 18 11:38:49 1999

diff -u --recursive --new-file v2.3.14/linux/net/ipv4/ip_masq_user.c linux/net/ipv4/ip_masq_user.c
@@ -1,467 +0,0 @@
-/*
- *	IP_MASQ_USER user space control module
- *
- *
- *	$Id: ip_masq_user.c,v 1.1 1998/08/29 23:51:08 davem Exp $
- */
-
-#include <linux/config.h>
-#include <linux/module.h>
-#include <linux/types.h>
-#include <linux/kernel.h>
-#include <linux/errno.h>
-#include <linux/skbuff.h>
-#include <asm/system.h>
-#include <linux/stat.h>
-#include <linux/proc_fs.h>
-#include <linux/in.h>
-#include <linux/ip.h>
-#include <linux/inet.h>
-#include <linux/init.h>
-#include <net/protocol.h>
-#include <net/icmp.h>
-#include <net/tcp.h>
-#include <net/udp.h>
-#include <net/checksum.h>
-#include <net/ip_masq.h>
-#include <net/ip_masq_mod.h>
-#include <linux/sysctl.h>
-#include <linux/ip_fw.h>
-
-#include <linux/ip_masq.h>
-
-/*
- *	Debug level
- */
-static int debug=0;
-
-MODULE_PARM(ports, "1-" __MODULE_STRING(MAX_MASQ_APP_PORTS) "i");
-MODULE_PARM(debug, "i");
-
-/*
-static int check_5uple (struct ip_masq_user *ums) {
-	return 0;
-}
-*/
-static void masq_user_k2u(const struct ip_masq *ms, struct ip_masq_user *ums)
-{
-	ums->protocol = ms->protocol;
-	ums->daddr = ms->daddr;
-	ums->dport = ms->dport;
-	ums->maddr = ms->maddr;
-	ums->mport = ms->mport;
-	ums->saddr = ms->saddr;
-	ums->sport = ms->sport;
-	ums->timeout = ms->timeout;
-}
-
-
-static int ip_masq_user_maddr(struct ip_masq_user *ums)
-{
-	struct net_device *dev;
-	struct rtable *rt;
-	int ret = -EINVAL;
-	u32 rt_daddr, rt_saddr;
-	u32 tos;
-
-	/*
-	 *	Did specify masq address.
-	 */
-	if (ums->maddr)
-		return 0;
-
-	/*
-	 *	Select address to use for routing query
-	 */
-
-	rt_daddr = ums->rt_daddr? ums->rt_daddr : ums->daddr;
-	rt_saddr = ums->rt_saddr? ums->rt_saddr : ums->saddr;
-
-
-	/*
-	 *	No address for routing, cannot continue
-	 */
-	if (rt_daddr == 0) {
-		IP_MASQ_DEBUG(1-debug, "cannot setup maddr with daddr=%lX, rt_addr=%lX\n",
-			     ntohl(ums->daddr), ntohl(ums->rt_daddr));
-		return -EINVAL;
-	}
-
-	/*
-	 *	Find out rt device 
-	 */
-
-	rt_saddr = 0; 
-	tos = RT_TOS(ums->ip_tos) | RTO_CONN;
-
-	if ((ret=ip_route_output(&rt, rt_daddr, rt_saddr, tos, 0 /* dev */))) {
-		IP_MASQ_DEBUG(0-debug, "could not setup maddr for routing daddr=%lX, saddr=%lX\n",
-			     ntohl(rt_daddr), ntohl(rt_saddr));
-		return ret;
-	}
-	dev = rt->u.dst.dev;
-	ums->maddr = ip_masq_select_addr(dev, rt->rt_gateway, RT_SCOPE_UNIVERSE);
-
-	IP_MASQ_DEBUG(1-debug, "did setup maddr=%lX\n", ntohl(ums->maddr));
-	ip_rt_put(rt);
-	return 0;
-}
-
-/*
- *	Create new entry (from uspace)
- */
-static int ip_masq_user_new(struct ip_masq_user *ums)
-{
-	struct ip_masq *ms = NULL;
-	unsigned mflags = 0;
-	int ret;
-
-	if (masq_proto_num (ums->protocol) == -1) {
-		return EPROTONOSUPPORT;
-	}
-
-	if (ums->dport == 0) {
-		ums->flags |= IP_MASQ_USER_F_LISTEN;
-	}
-
-	if (ums->flags | IP_MASQ_USER_F_LISTEN) {
-		if ((ums->saddr == 0) || (ums->sport == 0)) {
-			return EINVAL;
-		}
-		mflags |= (IP_MASQ_F_NO_DPORT|IP_MASQ_F_NO_DADDR);
-
-	}
-
-	if ((ret = ip_masq_user_maddr(ums)) < 0) {
-		return -ret;
-	}
-
-	mflags |= IP_MASQ_F_USER;
-	ms = ip_masq_new(ums->protocol, 
-			ums->maddr, ums->mport, 
-			ums->saddr, ums->sport,
-			ums->daddr, ums->dport,
-			mflags);
-	
-	if (ms == NULL) {
-		/*
-		 *	FIXME: ip_masq_new() should return errno
-		 */
-		return EBUSY;
-	}
-
-	/*
-	 *	Setup timeouts for this new entry
-	 */
-
-	if (ums->timeout) {
-		ms->timeout = ums->timeout;
-	} else if (ums->flags | IP_MASQ_USER_F_LISTEN) {
-		ip_masq_listen(ms);
-	}
-
-	masq_user_k2u(ms, ums);
-	ip_masq_put(ms);
-	return 0;
-}
-
-/* 
- *	Delete existing entry
- */
-static int ip_masq_user_del(struct ip_masq_user *ums)
-{
-	struct ip_masq *ms=NULL;
-
-	if (masq_proto_num (ums->protocol) == -1) {
-		return EPROTONOSUPPORT;
-	}
-	start_bh_atomic();
-	if (ums->mport && ums->maddr) {
-		ms = ip_masq_in_get(ums->protocol, 
-				ums->daddr, ums->dport, 
-				ums->maddr, ums->mport);
-		end_bh_atomic();
-	} else if (ums->sport && ums->saddr) {
-		ms = ip_masq_out_get(ums->protocol,
-				ums->saddr, ums->sport,
-				ums->daddr, ums->dport);
-		end_bh_atomic();
-	} else
-		return EINVAL;	
-	
-	if (ms == NULL) {
-		return ESRCH;
-	}
-
-	/*
-	 *	got (locked) entry, setup almost tiny timeout :) and  
-	 *	give away
-	 *
-	 *	FIXME: should use something better than S_CLOSE
-	 */
-	ms->timeout = IP_MASQ_S_CLOSE;
-
-	masq_user_k2u(ms, ums);
-	ip_masq_put(ms);
-	return 0;
-}
-
-static struct ip_masq * ip_masq_user_locked_get (struct ip_masq_user *ums, int *err)
-{
-	struct ip_masq *ms=NULL;
-	if (masq_proto_num (ums->protocol) == -1) {
-		*err = EPROTONOSUPPORT;
-	}
-
-	start_bh_atomic();
-	if (ums->mport && ums->maddr) {
-		ms = ip_masq_in_get(ums->protocol, 
-				ums->daddr, ums->dport, 
-				ums->maddr, ums->mport);
-		end_bh_atomic();
-	} else if (ums->sport && ums->saddr) {
-		ms = ip_masq_out_get(ums->protocol,
-				ums->saddr, ums->sport,
-				ums->daddr, ums->dport);
-		end_bh_atomic();
-	} else
-		*err = EINVAL;	
-	
-	if (ms == NULL) *err = ESRCH;
-	return ms;
-}
-
-/*
- * 	Get existing entry (complete full tunnel info)
- */
-static int ip_masq_user_get(struct ip_masq_user *ums)
-{
-	struct ip_masq *ms=NULL;
-	int err;
-
-	ms = ip_masq_user_locked_get(ums, &err);
-	if (ms == NULL)
-		return err;
-
-	masq_user_k2u(ms, ums);
-
-	ip_masq_put(ms);
-	return 0;
-}
-
-/* 
- *	Set (some, valid) entry parameters
- */
-static int ip_masq_user_set(struct ip_masq_user *ums)
-{
-	struct ip_masq *ms = NULL;
-	int err;
-
-	ms = ip_masq_user_locked_get(ums, &err);
-	if (ms == NULL)
-		return err;
-	
-	/*
-	 *	FIXME: must allow selecting what you want to set
-	 */
-	ms->timeout = ums->timeout;
-
-	masq_user_k2u(ms, ums);
-	
-	ip_masq_put(ms);
-	return 0;
-}
-
-
-/*
- *	Entry point
- *	ret value:
- *		<0   err
- *		==0  ok
- *		>0   ok, copy to user
- */
-static int ip_masq_user_ctl(int optname, struct ip_masq_ctl *mctl, int optlen)
-{
-	struct ip_masq_user *ums = &mctl->u.user;
-	int ret = EINVAL;
-	int arglen = optlen - IP_MASQ_CTL_BSIZE;
-	int cmd;
-
-	IP_MASQ_DEBUG(1-debug, "ip_masq_user_ctl(len=%d/%d|%d/%d)\n",
-		arglen,
-		sizeof (*ums),
-		optlen,
-		sizeof (*mctl));
-
-	/*
-	 *	Yes, I'm a bad guy ...
-	 */
-	if (arglen != sizeof(*ums) && optlen != sizeof(*mctl)) 
-		return EINVAL;
-
-	MOD_INC_USE_COUNT;
-
-	/* 
-	 *	Don't trust the lusers - plenty of error checking! 
-	 */
-	cmd = mctl->m_cmd;
-	IP_MASQ_DEBUG(1-debug, "ip_masq_user_ctl(cmd=%d)\n", cmd);
-
-	switch (mctl->m_cmd) {
-		case IP_MASQ_CMD_ADD:
-		case IP_MASQ_CMD_INSERT:
-			ret = ip_masq_user_new(ums);
-			break;
-		case IP_MASQ_CMD_DEL:
-			ret = ip_masq_user_del(ums);
-			break;
-		case IP_MASQ_CMD_SET:
-			ret = ip_masq_user_set(ums);
-			break;
-		case IP_MASQ_CMD_GET:
-			ret = ip_masq_user_get(ums);
-			break;
-	}
-
-	/*
-	 *	For all of the above, return masq tunnel info
-	 */
-
-	ret = -ret;
-
-	if (ret == 0) {
-		ret = sizeof (*ums) + IP_MASQ_CTL_BSIZE;
-		IP_MASQ_DEBUG(1-debug, "will return %d bytes to user\n", ret);
-	}
-
-	MOD_DEC_USE_COUNT;
-	return ret;
-}
-
-
-#ifdef CONFIG_PROC_FS
-static int ip_masq_user_info(char *buffer, char **start, off_t offset,
-			      int length, int proto)
-{
-	off_t pos=0, begin;
-	struct ip_masq *ms;
-	char temp[129];
-        int idx = 0;
-	int len=0;
-	int magic_control;
-
-	MOD_INC_USE_COUNT;
-
-	IP_MASQ_DEBUG(1-debug, "Entered user_info with proto=%d\n", proto);
-
-	if (offset < 128)
-	{
-		sprintf(temp,
-			"Prot SrcIP    SPrt DstIP    DPrt MAddr    MPrt State        Flgs Ref Ctl Expires (free=%d,%d,%d)",
-			atomic_read(ip_masq_free_ports), 
-			atomic_read(ip_masq_free_ports+1), 
-			atomic_read(ip_masq_free_ports+2));
-		len = sprintf(buffer, "%-127s\n", temp);
-	}
-	pos = 128;
-
-        for(idx = 0; idx < IP_MASQ_TAB_SIZE; idx++)
-	{
-	/*
-	 *	Lock is actually only need in next loop 
-	 *	we are called from uspace: must stop bh.
-	 */
-	read_lock_bh(&__ip_masq_lock);
-        for(ms = ip_masq_m_tab[idx]; ms ; ms = ms->m_link)
-	{
-		if (ms->protocol != proto) {
-			continue;
-		}
-
-		pos += 128;
-		if (pos <= offset) {
-			len = 0;
-			continue;
-		}
-
-		/*
-		 *	We have locked the tables, no need to del/add timers
-		 *	nor cli()  8)
-		 */
-		
-
-		magic_control = atomic_read(&ms->n_control);
-		if (!magic_control && ms->control) magic_control = -1;
-		sprintf(temp,"%-4s %08lX:%04X %08lX:%04X %08lX:%04X %-12s %3X %4d %3d %7lu",
-			masq_proto_name(ms->protocol),
-			ntohl(ms->saddr), ntohs(ms->sport),
-			ntohl(ms->daddr), ntohs(ms->dport),
-			ntohl(ms->maddr), ntohs(ms->mport),
-			ip_masq_state_name(ms->state),
-			ms->flags,
-			atomic_read(&ms->refcnt),
-			magic_control,
-			(ms->timer.expires-jiffies)/HZ);
-		len += sprintf(buffer+len, "%-127s\n", temp);
-
-		if(len >= length) {
-			read_unlock_bh(&__ip_masq_lock);
-			goto done;
-		}
-	}
-	read_unlock_bh(&__ip_masq_lock);
-	}
-
-done:
-
-	if (len) {
-		begin = len - (pos - offset);
-		*start = buffer + begin;
-		len -= begin;
-	}
-	if(len>length)
-		len = length;
-	MOD_DEC_USE_COUNT;
-	return len;
-}
-#else
-#define ip_masq_user_info	NULL
-#endif
-
-static struct ip_masq_hook ip_masq_user = {
-	ip_masq_user_ctl,
-	ip_masq_user_info
-};
-
-int ip_masq_user_init(void)
-{
-	if (ip_masq_user_hook != NULL) 
-		return -EEXIST;
-	ip_masq_user_hook = &ip_masq_user;
-	return 0;
-}
-
-int ip_masq_user_done(void)
-{
-	if (ip_masq_user_hook == NULL) 
-		return ENOENT;
-	ip_masq_user_hook = NULL;
-	return 0;
-}
-
-#ifdef MODULE
-EXPORT_NO_SYMBOLS;
-int init_module(void)
-{
-	if (ip_masq_user_init() != 0)
-		return -EIO;
-	return 0;
-}
-
-void cleanup_module(void)
-{
-	if (ip_masq_user_done() != 0)
-		printk(KERN_INFO "ip_masq_user_done(): can't remove module");
-}
-
-#endif /* MODULE */