1 files changed, 0 insertions, 436 deletions

diff --git a/net/ipv4/netfilter/ip_nat_helper.c b/net/ipv4/netfilter/ip_nat_helper.c
deleted file mode 100644
index dc778cfef58..00000000000
--- a/net/ipv4/netfilter/ip_nat_helper.c
+++ /dev/null
@@ -1,436 +0,0 @@
-/* ip_nat_helper.c - generic support functions for NAT helpers
- *
- * (C) 2000-2002 Harald Welte <laforge@netfilter.org>
- * (C) 2003-2004 Netfilter Core Team <coreteam@netfilter.org>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * 	14 Jan 2002 Harald Welte <laforge@gnumonks.org>:
- *		- add support for SACK adjustment
- *	14 Mar 2002 Harald Welte <laforge@gnumonks.org>:
- *		- merge SACK support into newnat API
- *	16 Aug 2002 Brian J. Murrell <netfilter@interlinx.bc.ca>:
- *		- make ip_nat_resize_packet more generic (TCP and UDP)
- *		- add ip_nat_mangle_udp_packet
- */
-#include <linux/module.h>
-#include <linux/kmod.h>
-#include <linux/types.h>
-#include <linux/timer.h>
-#include <linux/skbuff.h>
-#include <linux/netfilter_ipv4.h>
-#include <net/checksum.h>
-#include <net/icmp.h>
-#include <net/ip.h>
-#include <net/tcp.h>
-#include <net/udp.h>
-
-#include <linux/netfilter_ipv4/ip_conntrack.h>
-#include <linux/netfilter_ipv4/ip_conntrack_helper.h>
-#include <linux/netfilter_ipv4/ip_nat.h>
-#include <linux/netfilter_ipv4/ip_nat_protocol.h>
-#include <linux/netfilter_ipv4/ip_nat_core.h>
-#include <linux/netfilter_ipv4/ip_nat_helper.h>
-
-#if 0
-#define DEBUGP printk
-#define DUMP_OFFSET(x)	printk("offset_before=%d, offset_after=%d, correction_pos=%u\n", x->offset_before, x->offset_after, x->correction_pos);
-#else
-#define DEBUGP(format, args...)
-#define DUMP_OFFSET(x)
-#endif
-
-static DEFINE_SPINLOCK(ip_nat_seqofs_lock);
-
-/* Setup TCP sequence correction given this change at this sequence */
-static inline void
-adjust_tcp_sequence(u32 seq,
-		    int sizediff,
-		    struct ip_conntrack *ct,
-		    enum ip_conntrack_info ctinfo)
-{
-	int dir;
-	struct ip_nat_seq *this_way, *other_way;
-
-	DEBUGP("ip_nat_resize_packet: old_size = %u, new_size = %u\n",
-		(*skb)->len, new_size);
-
-	dir = CTINFO2DIR(ctinfo);
-
-	this_way = &ct->nat.info.seq[dir];
-	other_way = &ct->nat.info.seq[!dir];
-
-	DEBUGP("ip_nat_resize_packet: Seq_offset before: ");
-	DUMP_OFFSET(this_way);
-
-	spin_lock_bh(&ip_nat_seqofs_lock);
-
-	/* SYN adjust. If it's uninitialized, or this is after last
-	 * correction, record it: we don't handle more than one
-	 * adjustment in the window, but do deal with common case of a
-	 * retransmit */
-	if (this_way->offset_before == this_way->offset_after
-	    || before(this_way->correction_pos, seq)) {
-		    this_way->correction_pos = seq;
-		    this_way->offset_before = this_way->offset_after;
-		    this_way->offset_after += sizediff;
-	}
-	spin_unlock_bh(&ip_nat_seqofs_lock);
-
-	DEBUGP("ip_nat_resize_packet: Seq_offset after: ");
-	DUMP_OFFSET(this_way);
-}
-
-/* Frobs data inside this packet, which is linear. */
-static void mangle_contents(struct sk_buff *skb,
-			    unsigned int dataoff,
-			    unsigned int match_offset,
-			    unsigned int match_len,
-			    const char *rep_buffer,
-			    unsigned int rep_len)
-{
-	unsigned char *data;
-
-	BUG_ON(skb_is_nonlinear(skb));
-	data = (unsigned char *)skb->nh.iph + dataoff;
-
-	/* move post-replacement */
-	memmove(data + match_offset + rep_len,
-		data + match_offset + match_len,
-		skb->tail - (data + match_offset + match_len));
-
-	/* insert data from buffer */
-	memcpy(data + match_offset, rep_buffer, rep_len);
-
-	/* update skb info */
-	if (rep_len > match_len) {
-		DEBUGP("ip_nat_mangle_packet: Extending packet by "
-			"%u from %u bytes\n", rep_len - match_len,
-		       skb->len);
-		skb_put(skb, rep_len - match_len);
-	} else {
-		DEBUGP("ip_nat_mangle_packet: Shrinking packet from "
-			"%u from %u bytes\n", match_len - rep_len,
-		       skb->len);
-		__skb_trim(skb, skb->len + rep_len - match_len);
-	}
-
-	/* fix IP hdr checksum information */
-	skb->nh.iph->tot_len = htons(skb->len);
-	ip_send_check(skb->nh.iph);
-}
-
-/* Unusual, but possible case. */
-static int enlarge_skb(struct sk_buff **pskb, unsigned int extra)
-{
-	struct sk_buff *nskb;
-
-	if ((*pskb)->len + extra > 65535)
-		return 0;
-
-	nskb = skb_copy_expand(*pskb, skb_headroom(*pskb), extra, GFP_ATOMIC);
-	if (!nskb)
-		return 0;
-
-	/* Transfer socket to new skb. */
-	if ((*pskb)->sk)
-		skb_set_owner_w(nskb, (*pskb)->sk);
-	kfree_skb(*pskb);
-	*pskb = nskb;
-	return 1;
-}
-
-/* Generic function for mangling variable-length address changes inside
- * NATed TCP connections (like the PORT XXX,XXX,XXX,XXX,XXX,XXX
- * command in FTP).
- *
- * Takes care about all the nasty sequence number changes, checksumming,
- * skb enlargement, ...
- *
- * */
-int
-ip_nat_mangle_tcp_packet(struct sk_buff **pskb,
-			 struct ip_conntrack *ct,
-			 enum ip_conntrack_info ctinfo,
-			 unsigned int match_offset,
-			 unsigned int match_len,
-			 const char *rep_buffer,
-			 unsigned int rep_len)
-{
-	struct iphdr *iph;
-	struct tcphdr *tcph;
-	int oldlen, datalen;
-
-	if (!skb_make_writable(pskb, (*pskb)->len))
-		return 0;
-
-	if (rep_len > match_len
-	    && rep_len - match_len > skb_tailroom(*pskb)
-	    && !enlarge_skb(pskb, rep_len - match_len))
-		return 0;
-
-	SKB_LINEAR_ASSERT(*pskb);
-
-	iph = (*pskb)->nh.iph;
-	tcph = (void *)iph + iph->ihl*4;
-
-	oldlen = (*pskb)->len - iph->ihl*4;
-	mangle_contents(*pskb, iph->ihl*4 + tcph->doff*4,
-			match_offset, match_len, rep_buffer, rep_len);
-
-	datalen = (*pskb)->len - iph->ihl*4;
-	if ((*pskb)->ip_summed != CHECKSUM_PARTIAL) {
-		tcph->check = 0;
-		tcph->check = tcp_v4_check(datalen,
-					   iph->saddr, iph->daddr,
-					   csum_partial((char *)tcph,
-							datalen, 0));
-	} else
-		nf_proto_csum_replace2(&tcph->check, *pskb,
-					htons(oldlen), htons(datalen), 1);
-
-	if (rep_len != match_len) {
-		set_bit(IPS_SEQ_ADJUST_BIT, &ct->status);
-		adjust_tcp_sequence(ntohl(tcph->seq),
-				    (int)rep_len - (int)match_len,
-				    ct, ctinfo);
-		/* Tell TCP window tracking about seq change */
-		ip_conntrack_tcp_update(*pskb, ct, CTINFO2DIR(ctinfo));
-	}
-	return 1;
-}
-EXPORT_SYMBOL(ip_nat_mangle_tcp_packet);
-
-/* Generic function for mangling variable-length address changes inside
- * NATed UDP connections (like the CONNECT DATA XXXXX MESG XXXXX INDEX XXXXX
- * command in the Amanda protocol)
- *
- * Takes care about all the nasty sequence number changes, checksumming,
- * skb enlargement, ...
- *
- * XXX - This function could be merged with ip_nat_mangle_tcp_packet which
- *       should be fairly easy to do.
- */
-int
-ip_nat_mangle_udp_packet(struct sk_buff **pskb,
-			 struct ip_conntrack *ct,
-			 enum ip_conntrack_info ctinfo,
-			 unsigned int match_offset,
-			 unsigned int match_len,
-			 const char *rep_buffer,
-			 unsigned int rep_len)
-{
-	struct iphdr *iph;
-	struct udphdr *udph;
-	int datalen, oldlen;
-
-	/* UDP helpers might accidentally mangle the wrong packet */
-	iph = (*pskb)->nh.iph;
-	if ((*pskb)->len < iph->ihl*4 + sizeof(*udph) +
-			       match_offset + match_len)
-		return 0;
-
-	if (!skb_make_writable(pskb, (*pskb)->len))
-		return 0;
-
-	if (rep_len > match_len
-	    && rep_len - match_len > skb_tailroom(*pskb)
-	    && !enlarge_skb(pskb, rep_len - match_len))
-		return 0;
-
-	iph = (*pskb)->nh.iph;
-	udph = (void *)iph + iph->ihl*4;
-
-	oldlen = (*pskb)->len - iph->ihl*4;
-	mangle_contents(*pskb, iph->ihl*4 + sizeof(*udph),
-			match_offset, match_len, rep_buffer, rep_len);
-
-	/* update the length of the UDP packet */
-	datalen = (*pskb)->len - iph->ihl*4;
-	udph->len = htons(datalen);
-
-	/* fix udp checksum if udp checksum was previously calculated */
-	if (!udph->check && (*pskb)->ip_summed != CHECKSUM_PARTIAL)
-		return 1;
-
-	if ((*pskb)->ip_summed != CHECKSUM_PARTIAL) {
-		udph->check = 0;
-		udph->check = csum_tcpudp_magic(iph->saddr, iph->daddr,
-						datalen, IPPROTO_UDP,
-						csum_partial((char *)udph,
-							     datalen, 0));
-		if (!udph->check)
-			udph->check = CSUM_MANGLED_0;
-	} else
-		nf_proto_csum_replace2(&udph->check, *pskb,
-					htons(oldlen), htons(datalen), 1);
-	return 1;
-}
-EXPORT_SYMBOL(ip_nat_mangle_udp_packet);
-
-/* Adjust one found SACK option including checksum correction */
-static void
-sack_adjust(struct sk_buff *skb,
-	    struct tcphdr *tcph,
-	    unsigned int sackoff,
-	    unsigned int sackend,
-	    struct ip_nat_seq *natseq)
-{
-	while (sackoff < sackend) {
-		struct tcp_sack_block_wire *sack;
-		__be32 new_start_seq, new_end_seq;
-
-		sack = (void *)skb->data + sackoff;
-		if (after(ntohl(sack->start_seq) - natseq->offset_before,
-			  natseq->correction_pos))
-			new_start_seq = htonl(ntohl(sack->start_seq)
-					- natseq->offset_after);
-		else
-			new_start_seq = htonl(ntohl(sack->start_seq)
-					- natseq->offset_before);
-
-		if (after(ntohl(sack->end_seq) - natseq->offset_before,
-			  natseq->correction_pos))
-			new_end_seq = htonl(ntohl(sack->end_seq)
-				      - natseq->offset_after);
-		else
-			new_end_seq = htonl(ntohl(sack->end_seq)
-				      - natseq->offset_before);
-
-		DEBUGP("sack_adjust: start_seq: %d->%d, end_seq: %d->%d\n",
-			ntohl(sack->start_seq), new_start_seq,
-			ntohl(sack->end_seq), new_end_seq);
-
-		nf_proto_csum_replace4(&tcph->check, skb,
-					sack->start_seq, new_start_seq, 0);
-		nf_proto_csum_replace4(&tcph->check, skb,
-					sack->end_seq, new_end_seq, 0);
-		sack->start_seq = new_start_seq;
-		sack->end_seq = new_end_seq;
-		sackoff += sizeof(*sack);
-	}
-}
-
-/* TCP SACK sequence number adjustment */
-static inline unsigned int
-ip_nat_sack_adjust(struct sk_buff **pskb,
-		   struct tcphdr *tcph,
-		   struct ip_conntrack *ct,
-		   enum ip_conntrack_info ctinfo)
-{
-	unsigned int dir, optoff, optend;
-
-	optoff = (*pskb)->nh.iph->ihl*4 + sizeof(struct tcphdr);
-	optend = (*pskb)->nh.iph->ihl*4 + tcph->doff*4;
-
-	if (!skb_make_writable(pskb, optend))
-		return 0;
-
-	dir = CTINFO2DIR(ctinfo);
-
-	while (optoff < optend) {
-		/* Usually: option, length. */
-		unsigned char *op = (*pskb)->data + optoff;
-
-		switch (op[0]) {
-		case TCPOPT_EOL:
-			return 1;
-		case TCPOPT_NOP:
-			optoff++;
-			continue;
-		default:
-			/* no partial options */
-			if (optoff + 1 == optend
-			    || optoff + op[1] > optend
-			    || op[1] < 2)
-				return 0;
-			if (op[0] == TCPOPT_SACK
-			    && op[1] >= 2+TCPOLEN_SACK_PERBLOCK
-			    && ((op[1] - 2) % TCPOLEN_SACK_PERBLOCK) == 0)
-				sack_adjust(*pskb, tcph, optoff+2,
-					    optoff+op[1],
-					    &ct->nat.info.seq[!dir]);
-			optoff += op[1];
-		}
-	}
-	return 1;
-}
-
-/* TCP sequence number adjustment.  Returns 1 on success, 0 on failure */
-int
-ip_nat_seq_adjust(struct sk_buff **pskb,
-		  struct ip_conntrack *ct,
-		  enum ip_conntrack_info ctinfo)
-{
-	struct tcphdr *tcph;
-	int dir;
-	__be32 newseq, newack;
-	struct ip_nat_seq *this_way, *other_way;
-
-	dir = CTINFO2DIR(ctinfo);
-
-	this_way = &ct->nat.info.seq[dir];
-	other_way = &ct->nat.info.seq[!dir];
-
-	if (!skb_make_writable(pskb, (*pskb)->nh.iph->ihl*4+sizeof(*tcph)))
-		return 0;
-
-	tcph = (void *)(*pskb)->data + (*pskb)->nh.iph->ihl*4;
-	if (after(ntohl(tcph->seq), this_way->correction_pos))
-		newseq = htonl(ntohl(tcph->seq) + this_way->offset_after);
-	else
-		newseq = htonl(ntohl(tcph->seq) + this_way->offset_before);
-
-	if (after(ntohl(tcph->ack_seq) - other_way->offset_before,
-		  other_way->correction_pos))
-		newack = htonl(ntohl(tcph->ack_seq) - other_way->offset_after);
-	else
-		newack = htonl(ntohl(tcph->ack_seq) - other_way->offset_before);
-
-	nf_proto_csum_replace4(&tcph->check, *pskb, tcph->seq, newseq, 0);
-	nf_proto_csum_replace4(&tcph->check, *pskb, tcph->ack_seq, newack, 0);
-
-	DEBUGP("Adjusting sequence number from %u->%u, ack from %u->%u\n",
-		ntohl(tcph->seq), ntohl(newseq), ntohl(tcph->ack_seq),
-		ntohl(newack));
-
-	tcph->seq = newseq;
-	tcph->ack_seq = newack;
-
-	if (!ip_nat_sack_adjust(pskb, tcph, ct, ctinfo))
-		return 0;
-
-	ip_conntrack_tcp_update(*pskb, ct, dir);
-
-	return 1;
-}
-EXPORT_SYMBOL(ip_nat_seq_adjust);
-
-/* Setup NAT on this expected conntrack so it follows master. */
-/* If we fail to get a free NAT slot, we'll get dropped on confirm */
-void ip_nat_follow_master(struct ip_conntrack *ct,
-			  struct ip_conntrack_expect *exp)
-{
-	struct ip_nat_range range;
-
-	/* This must be a fresh one. */
-	BUG_ON(ct->status & IPS_NAT_DONE_MASK);
-
-	/* Change src to where master sends to */
-	range.flags = IP_NAT_RANGE_MAP_IPS;
-	range.min_ip = range.max_ip
-		= ct->master->tuplehash[!exp->dir].tuple.dst.ip;
-	/* hook doesn't matter, but it has to do source manip */
-	ip_nat_setup_info(ct, &range, NF_IP_POST_ROUTING);
-
-	/* For DST manip, map port here to where it's expected. */
-	range.flags = (IP_NAT_RANGE_MAP_IPS | IP_NAT_RANGE_PROTO_SPECIFIED);
-	range.min = range.max = exp->saved_proto;
-	range.min_ip = range.max_ip
-		= ct->master->tuplehash[!exp->dir].tuple.src.ip;
-	/* hook doesn't matter, but it has to do destination manip */
-	ip_nat_setup_info(ct, &range, NF_IP_PRE_ROUTING);
-}
-EXPORT_SYMBOL(ip_nat_follow_master);