[NETFILTER]: Make NAT code handle non-linear skbs.

Makes the NAT code and all NAT helpers handle non-linear skbs.
Main trick is to introduce skb_ip_make_writable which handles all
the decloning, linearizing, etc.

include/linux/netfilter_ipv4/ip_nat_core.h

@@ -16,7 +16,7 @@ extern unsigned int do_bindings(struct ip_conntrack *ct,
 
 extern struct list_head protos;
 
-extern unsigned int icmp_reply_translation(struct sk_buff *skb,
+extern int icmp_reply_translation(struct sk_buff **pskb,
 				  struct ip_conntrack *conntrack,
 				  unsigned int hooknum,
 				  int dir);
@@ -30,4 +30,10 @@ extern void place_in_hashes(struct ip_conntrack *conntrack,
 extern struct ip_nat_protocol ip_nat_protocol_tcp;
 extern struct ip_nat_protocol ip_nat_protocol_udp;
 extern struct ip_nat_protocol ip_nat_protocol_icmp;
+
+/* Call this before modifying an existing IP packet: ensures it is
+   modifiable and linear to the point you care about (writable_len).
+   Returns true or false. */
+extern int skb_ip_make_writable(struct sk_buff **pskb,
+				unsigned int writable_len);
 #endif /* _IP_NAT_CORE_H */

include/linux/netfilter_ipv4/ip_nat_helper.h

@@ -43,22 +43,23 @@ extern struct list_head helpers;
 
 extern int ip_nat_helper_register(struct ip_nat_helper *me);
 extern void ip_nat_helper_unregister(struct ip_nat_helper *me);
+
+/* These return true or false. */
 extern int ip_nat_mangle_tcp_packet(struct sk_buff **skb,
 				struct ip_conntrack *ct,
 				enum ip_conntrack_info ctinfo,
 				unsigned int match_offset,
 				unsigned int match_len,
-				char *rep_buffer,
+				const char *rep_buffer,
 				unsigned int rep_len);
 extern int ip_nat_mangle_udp_packet(struct sk_buff **skb,
 				struct ip_conntrack *ct,
 				enum ip_conntrack_info ctinfo,
 				unsigned int match_offset,
 				unsigned int match_len,
-				char *rep_buffer,
+				const char *rep_buffer,
 				unsigned int rep_len);
-extern int ip_nat_seq_adjust(struct sk_buff *skb,
+extern int ip_nat_seq_adjust(struct sk_buff **pskb, 
 			     struct ip_conntrack *ct, 
 			     enum ip_conntrack_info ctinfo);
-extern void ip_nat_delete_sack(struct sk_buff *skb);
 #endif

include/linux/netfilter_ipv4/ip_nat_protocol.h

@@ -18,8 +18,9 @@ struct ip_nat_protocol
 	unsigned int protonum;
 
 	/* Do a packet translation according to the ip_nat_proto_manip
-	 * and manip type. */
-	void (*manip_pkt)(struct iphdr *iph, size_t len,
+	 * and manip type.  Return true if succeeded. */
+	int (*manip_pkt)(struct sk_buff **pskb,
+			 unsigned int hdroff,
 			 const struct ip_conntrack_manip *manip,
 			 enum ip_nat_manip_type maniptype);
 

net/ipv4/netfilter/ip_nat_core.c

@@ -13,6 +13,8 @@
 #include <net/icmp.h>
 #include <net/ip.h>
 #include <net/tcp.h>  /* For tcp_prot in getorigdst */
+#include <linux/icmp.h>
+#include <linux/udp.h>
 
 #define ASSERT_READ_LOCK(x) MUST_BE_READ_LOCKED(&ip_nat_lock)
 #define ASSERT_WRITE_LOCK(x) MUST_BE_WRITE_LOCKED(&ip_nat_lock)
@@ -698,14 +700,26 @@ void place_in_hashes(struct ip_conntrack *conntrack,
 	list_prepend(&byipsproto[ipsprotohash], &info->byipsproto);
 }
 
-static void
-manip_pkt(u_int16_t proto, struct iphdr *iph, size_t len,
+/* Returns true if succeeded. */
+static int
+manip_pkt(u_int16_t proto,
+	  struct sk_buff **pskb,
+	  unsigned int iphdroff,
 	  const struct ip_conntrack_manip *manip,
-	  enum ip_nat_manip_type maniptype,
-	  __u32 *nfcache)
+	  enum ip_nat_manip_type maniptype)
 {
-	*nfcache |= NFC_ALTERED;
-	find_nat_proto(proto)->manip_pkt(iph, len, manip, maniptype);
+	struct iphdr *iph;
+
+	(*pskb)->nfcache |= NFC_ALTERED;
+	if (!skb_ip_make_writable(pskb, iphdroff+sizeof(iph)))
+		return 0;
+
+	iph = (void *)(*pskb)->data + iphdroff;
+
+	/* Manipulate protcol part. */
+	if (!find_nat_proto(proto)->manip_pkt(pskb, iphdroff + iph->ihl*4,
+					      manip, maniptype))
+		return 0;
 
 	if (maniptype == IP_NAT_MANIP_SRC) {
 		iph->check = ip_nat_cheat_check(~iph->saddr, manip->ip,
@@ -716,17 +730,7 @@ manip_pkt(u_int16_t proto, struct iphdr *iph, size_t len,
 						iph->check);
 		iph->daddr = manip->ip;
 	}
-#if 0
-	if (ip_fast_csum((u8 *)iph, iph->ihl) != 0)
-		DEBUGP("IP: checksum on packet bad.\n");
-
-	if (proto == IPPROTO_TCP) {
-		void *th = (u_int32_t *)iph + iph->ihl;
-		if (tcp_v4_check(th, len - 4*iph->ihl, iph->saddr, iph->daddr,
-				 csum_partial((char *)th, len-4*iph->ihl, 0)))
-			DEBUGP("TCP: checksum on packet bad\n");
-	}
-#endif
+	return 1;
 }
 
 static inline int exp_for_packet(struct ip_conntrack_expect *exp,
@@ -754,25 +758,13 @@ do_bindings(struct ip_conntrack *ct,
 	unsigned int i;
 	struct ip_nat_helper *helper;
 	enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
-	int is_tcp = (*pskb)->nh.iph->protocol == IPPROTO_TCP;
+	int proto = (*pskb)->nh.iph->protocol;
 
 	/* Need nat lock to protect against modification, but neither
 	   conntrack (referenced) and helper (deleted with
 	   synchronize_bh()) can vanish. */
 	READ_LOCK(&ip_nat_lock);
 	for (i = 0; i < info->num_manips; i++) {
-		/* raw socket (tcpdump) may have clone of incoming
-                   skb: don't disturb it --RR */
-		if (skb_cloned(*pskb) && !(*pskb)->sk) {
-			struct sk_buff *nskb = skb_copy(*pskb, GFP_ATOMIC);
-			if (!nskb) {
-				READ_UNLOCK(&ip_nat_lock);
-				return NF_DROP;
-			}
-			kfree_skb(*pskb);
-			*pskb = nskb;
-		}
-
 		if (info->manips[i].direction == dir
 		    && info->manips[i].hooknum == hooknum) {
 			DEBUGP("Mangling %p: %s to %u.%u.%u.%u %u\n",
@@ -781,12 +773,12 @@ do_bindings(struct ip_conntrack *ct,
 			       ? "SRC" : "DST",
 			       NIPQUAD(info->manips[i].manip.ip),
 			       htons(info->manips[i].manip.u.all));
-			manip_pkt((*pskb)->nh.iph->protocol,
-				  (*pskb)->nh.iph,
-				  (*pskb)->len,
+			if (manip_pkt(proto, pskb, 0,
 				      &info->manips[i].manip,
-				  info->manips[i].maniptype,
-				  &(*pskb)->nfcache);
+				      info->manips[i].maniptype) < 0) {
+				READ_UNLOCK(&ip_nat_lock);
+				return NF_DROP;
+			}
 		}
 	}
 	helper = info->helper;
@@ -839,12 +831,14 @@ do_bindings(struct ip_conntrack *ct,
 		
 		/* Adjust sequence number only once per packet 
 		 * (helper is called at all hooks) */
-		if (is_tcp && (hooknum == NF_IP_POST_ROUTING
+		if (proto == IPPROTO_TCP
+		    && (hooknum == NF_IP_POST_ROUTING
 			|| hooknum == NF_IP_LOCAL_IN)) {
 			DEBUGP("ip_nat_core: adjusting sequence number\n");
 			/* future: put this in a l4-proto specific function,
 			 * and call this function here. */
-			ip_nat_seq_adjust(*pskb, ct, ctinfo);
+			if (!ip_nat_seq_adjust(pskb, ct, ctinfo))
+				ret = NF_DROP;
 		}
 
 		return ret;
@@ -855,39 +849,51 @@ do_bindings(struct ip_conntrack *ct,
 	/* not reached */
 }
 
-unsigned int
-icmp_reply_translation(struct sk_buff *skb,
+int
+icmp_reply_translation(struct sk_buff **pskb,
 		       struct ip_conntrack *conntrack,
 		       unsigned int hooknum,
 		       int dir)
 {
-	struct iphdr *iph = skb->nh.iph;
-	struct icmphdr *hdr = (struct icmphdr *)((u_int32_t *)iph + iph->ihl);
-	struct iphdr *inner = (struct iphdr *)(hdr + 1);
-	size_t datalen = skb->len - ((void *)inner - (void *)iph);
+	struct {
+		struct icmphdr icmp;
+		struct iphdr ip;
+	} *inside;
 	unsigned int i;
 	struct ip_nat_info *info = &conntrack->nat.info;
 
-	IP_NF_ASSERT(skb->len >= iph->ihl*4 + sizeof(struct icmphdr));
+	if (!skb_ip_make_writable(pskb,(*pskb)->nh.iph->ihl*4+sizeof(*inside)))
+		return 0;
+	inside = (void *)(*pskb)->data + (*pskb)->nh.iph->ihl*4;
+
+	/* We're actually going to mangle it beyond trivial checksum
+	   adjustment, so make sure the current checksum is correct. */
+	if ((*pskb)->ip_summed != CHECKSUM_UNNECESSARY
+	    && (u16)csum_fold(skb_checksum(*pskb, (*pskb)->nh.iph->ihl*4,
+					   (*pskb)->len, 0)))
+		return 0;
+
 	/* Must be RELATED */
-	IP_NF_ASSERT(skb->nfct - (struct ip_conntrack *)skb->nfct->master
+	IP_NF_ASSERT((*pskb)->nfct
+		     - (struct ip_conntrack *)(*pskb)->nfct->master
 		     == IP_CT_RELATED
-		     || skb->nfct - (struct ip_conntrack *)skb->nfct->master
+		     || (*pskb)->nfct
+		     - (struct ip_conntrack *)(*pskb)->nfct->master
 		     == IP_CT_RELATED+IP_CT_IS_REPLY);
 
 	/* Redirects on non-null nats must be dropped, else they'll
            start talking to each other without our translation, and be
            confused... --RR */
-	if (hdr->type == ICMP_REDIRECT) {
+	if (inside->icmp.type == ICMP_REDIRECT) {
 		/* Don't care about races here. */
 		if (info->initialized
 		    != ((1 << IP_NAT_MANIP_SRC) | (1 << IP_NAT_MANIP_DST))
 		    || info->num_manips != 0)
-			return NF_DROP;
+			return 0;
 	}
 
 	DEBUGP("icmp_reply_translation: translating error %p hook %u dir %s\n",
-	       skb, hooknum, dir == IP_CT_DIR_ORIGINAL ? "ORIG" : "REPLY");
+	       *pskb, hooknum, dir == IP_CT_DIR_ORIGINAL ? "ORIG" : "REPLY");
 	/* Note: May not be from a NAT'd host, but probably safest to
 	   do translation always as if it came from the host itself
 	   (even though a "host unreachable" coming from the host
@@ -918,11 +924,13 @@ icmp_reply_translation(struct sk_buff *skb,
 			       ? "DST" : "SRC",
 			       NIPQUAD(info->manips[i].manip.ip),
 			       ntohs(info->manips[i].manip.u.udp.port));
-			manip_pkt(inner->protocol, inner,
-				  skb->len - ((void *)inner - (void *)iph),
+			if (manip_pkt(inside->ip.protocol, pskb,
+				      (*pskb)->nh.iph->ihl*4
+				      + sizeof(inside->icmp),
 				      &info->manips[i].manip,
-				  !info->manips[i].maniptype,
-				  &skb->nfcache);
+				      !info->manips[i].maniptype) < 0)
+				goto unlock_fail;
+
 			/* Outer packet needs to have IP header NATed like
 	                   it's a reply. */
 
@@ -932,22 +940,82 @@ icmp_reply_translation(struct sk_buff *skb,
 			       info->manips[i].maniptype == IP_NAT_MANIP_SRC
 			       ? "SRC" : "DST",
 			       NIPQUAD(info->manips[i].manip.ip));
-			manip_pkt(0, iph, skb->len,
+			if (manip_pkt(0, pskb, 0,
 				      &info->manips[i].manip,
-				  info->manips[i].maniptype,
-				  &skb->nfcache);
+				      info->manips[i].maniptype) < 0)
+				goto unlock_fail;
 		}
 	}
 	READ_UNLOCK(&ip_nat_lock);
 
-	/* Since we mangled inside ICMP packet, recalculate its
-	   checksum from scratch.  (Hence the handling of incorrect
-	   checksums in conntrack, so we don't accidentally fix one.)  */
-	hdr->checksum = 0;
-	hdr->checksum = ip_compute_csum((unsigned char *)hdr,
-					sizeof(*hdr) + datalen);
+	inside->icmp.checksum = 0;
+	inside->icmp.checksum = csum_fold(skb_checksum(*pskb,
+						       (*pskb)->nh.iph->ihl*4,
+						       (*pskb)->len, 0));
+	return 1;
 
-	return NF_ACCEPT;
+ unlock_fail:
+	READ_UNLOCK(&ip_nat_lock);
+	return 0;
+}
+
+int skb_ip_make_writable(struct sk_buff **pskb, unsigned int writable_len)
+{
+	struct sk_buff *nskb;
+	unsigned int iplen;
+
+	if (writable_len > (*pskb)->len)
+		return 0;
+
+	/* Not exclusive use of packet?  Must copy. */
+	if (skb_shared(*pskb) || skb_cloned(*pskb))
+		goto copy_skb;
+
+	/* Alexey says IP hdr is always modifiable and linear, so ok. */
+	if (writable_len <= (*pskb)->nh.iph->ihl*4)
+		return 1;
+
+	iplen = writable_len - (*pskb)->nh.iph->ihl*4;
+
+	/* DaveM says protocol headers are also modifiable. */
+	switch ((*pskb)->nh.iph->protocol) {
+	case IPPROTO_TCP: {
+		struct tcphdr hdr;
+		if (skb_copy_bits(*pskb, (*pskb)->nh.iph->ihl*4,
+				  &hdr, sizeof(hdr)) != 0)
+			goto copy_skb;
+		if (writable_len <= (*pskb)->nh.iph->ihl*4 + hdr.doff*4)
+			goto pull_skb;
+		goto copy_skb;
+	}
+	case IPPROTO_UDP:
+		if (writable_len<=(*pskb)->nh.iph->ihl*4+sizeof(struct udphdr))
+			goto pull_skb;
+		goto copy_skb;
+	case IPPROTO_ICMP:
+		if (writable_len
+		    <= (*pskb)->nh.iph->ihl*4 + sizeof(struct icmphdr))
+			goto pull_skb;
+		goto copy_skb;
+	/* Insert other cases here as desired */
+	}
+
+copy_skb:
+	nskb = skb_copy(*pskb, GFP_ATOMIC);
+	if (!nskb)
+		return 0;
+	BUG_ON(skb_is_nonlinear(nskb));
+
+	/* Rest of kernel will get very unhappy if we pass it a
+	   suddenly-orphaned skbuff */
+	if ((*pskb)->sk)
+		skb_set_owner_w(nskb, (*pskb)->sk);
+	kfree_skb(*pskb);
+	*pskb = nskb;
+	return 1;
+
+pull_skb:
+	return pskb_may_pull(*pskb, writable_len);
 }
 
 int __init ip_nat_init(void)

net/ipv4/netfilter/ip_nat_proto_icmp.c

@@ -42,17 +42,24 @@ icmp_unique_tuple(struct ip_conntrack_tuple *tuple,
 	return 0;
 }
 
-static void
-icmp_manip_pkt(struct iphdr *iph, size_t len,
+static int
+icmp_manip_pkt(struct sk_buff **pskb,
+	       unsigned int hdroff,
 	       const struct ip_conntrack_manip *manip,
 	       enum ip_nat_manip_type maniptype)
 {
-	struct icmphdr *hdr = (struct icmphdr *)((u_int32_t *)iph + iph->ihl);
+	struct icmphdr *hdr;
+
+	if (!skb_ip_make_writable(pskb, hdroff + sizeof(*hdr)))
+		return 0;
+
+	hdr = (void *)(*pskb)->data + hdroff;
 
 	hdr->checksum = ip_nat_cheat_check(hdr->un.echo.id ^ 0xFFFF,
 					    manip->u.icmp.id,
 					    hdr->checksum);
 	hdr->un.echo.id = manip->u.icmp.id;
+	return 1;
 }
 
 static unsigned int

net/ipv4/netfilter/ip_nat_proto_tcp.c

@@ -7,6 +7,7 @@
 #include <linux/netfilter_ipv4/ip_nat.h>
 #include <linux/netfilter_ipv4/ip_nat_rule.h>
 #include <linux/netfilter_ipv4/ip_nat_protocol.h>
+#include <linux/netfilter_ipv4/ip_nat_core.h>
 
 static int
 tcp_in_range(const struct ip_conntrack_tuple *tuple,
@@ -73,36 +74,49 @@ tcp_unique_tuple(struct ip_conntrack_tuple *tuple,
 	return 0;
 }
 
-static void
-tcp_manip_pkt(struct iphdr *iph, size_t len,
+static int
+tcp_manip_pkt(struct sk_buff **pskb,
+	      unsigned int hdroff,
 	      const struct ip_conntrack_manip *manip,
 	      enum ip_nat_manip_type maniptype)
 {
-	struct tcphdr *hdr = (struct tcphdr *)((u_int32_t *)iph + iph->ihl);
+	struct tcphdr *hdr;
 	u_int32_t oldip;
-	u_int16_t *portptr;
+	u_int16_t *portptr, oldport;
+	int hdrsize = 8; /* TCP connection tracking guarantees this much */
+
+	/* this could be a inner header returned in icmp packet; in such
+	   cases we cannot update the checksum field since it is outside of
+	   the 8 bytes of transport layer headers we are guaranteed */
+	if ((*pskb)->len >= hdroff + sizeof(struct tcphdr))
+		hdrsize = sizeof(struct tcphdr);
+
+	if (!skb_ip_make_writable(pskb, hdroff + hdrsize))
+		return 0;
+
+	hdr = (void *)(*pskb)->data + hdroff;
 
 	if (maniptype == IP_NAT_MANIP_SRC) {
 		/* Get rid of src ip and src pt */
-		oldip = iph->saddr;
+		oldip = (*pskb)->nh.iph->saddr;
 		portptr = &hdr->source;
 	} else {
 		/* Get rid of dst ip and dst pt */
-		oldip = iph->daddr;
+		oldip = (*pskb)->nh.iph->daddr;
 		portptr = &hdr->dest;
 	}
 
-	/* this could be a inner header returned in icmp packet; in such
-	   cases we cannot update the checksum field since it is outside of
-	   the 8 bytes of transport layer headers we are guaranteed */
-	if(((void *)&hdr->check + sizeof(hdr->check) - (void *)iph) <= len) {
+	oldport = *portptr;
+	*portptr = manip->u.tcp.port;
+
+	if (hdrsize < sizeof(*hdr))
+		return 1;
+
 	hdr->check = ip_nat_cheat_check(~oldip, manip->ip,
-					ip_nat_cheat_check(*portptr ^ 0xFFFF,
+					ip_nat_cheat_check(oldport ^ 0xFFFF,
 							   manip->u.tcp.port,
 							   hdr->check));
-	}
-
-	*portptr = manip->u.tcp.port;
+	return 1;
 }
 
 static unsigned int

net/ipv4/netfilter/ip_nat_proto_udp.c

@@ -72,22 +72,27 @@ udp_unique_tuple(struct ip_conntrack_tuple *tuple,
 	return 0;
 }
 
-static void
-udp_manip_pkt(struct iphdr *iph, size_t len,
+static int
+udp_manip_pkt(struct sk_buff **pskb,
+	      unsigned int hdroff,
 	      const struct ip_conntrack_manip *manip,
 	      enum ip_nat_manip_type maniptype)
 {
-	struct udphdr *hdr = (struct udphdr *)((u_int32_t *)iph + iph->ihl);
+	struct udphdr *hdr;
 	u_int32_t oldip;
 	u_int16_t *portptr;
 
+	if (!skb_ip_make_writable(pskb, hdroff + sizeof(hdr)))
+		return 0;
+
+	hdr = (void *)(*pskb)->data + hdroff;
 	if (maniptype == IP_NAT_MANIP_SRC) {
 		/* Get rid of src ip and src pt */
-		oldip = iph->saddr;
+		oldip = (*pskb)->nh.iph->saddr;
 		portptr = &hdr->source;
 	} else {
 		/* Get rid of dst ip and dst pt */
-		oldip = iph->daddr;
+		oldip = (*pskb)->nh.iph->daddr;
 		portptr = &hdr->dest;
 	}
 	if (hdr->check) /* 0 is a special case meaning no checksum */
@@ -96,6 +101,7 @@ udp_manip_pkt(struct iphdr *iph, size_t len,
 							   manip->u.udp.port,
 							   hdr->check));
 	*portptr = manip->u.udp.port;
+	return 1;
 }
 
 static unsigned int

net/ipv4/netfilter/ip_nat_proto_unknown.c

@@ -29,12 +29,13 @@ static int unknown_unique_tuple(struct ip_conntrack_tuple *tuple,
 	return 0;
 }
 
-static void
-unknown_manip_pkt(struct iphdr *iph, size_t len,
+static int
+unknown_manip_pkt(struct sk_buff **pskb,
+		  unsigned int hdroff,
 		  const struct ip_conntrack_manip *manip,
 		  enum ip_nat_manip_type maniptype)
 {
-	return;
+	return 1;
 }
 
 static unsigned int

net/ipv4/netfilter/ip_nat_standalone.c

@@ -71,10 +71,6 @@ ip_nat_fn(unsigned int hooknum,
 	/* maniptype == SRC for postrouting. */
 	enum ip_nat_manip_type maniptype = HOOK2MANIP(hooknum);
 
-	/* FIXME: Push down to extensions --RR */
-	if (skb_is_nonlinear(*pskb) && skb_linearize(*pskb, GFP_ATOMIC) != 0)
-		return NF_DROP;
-
 	/* We never see fragments: conntrack defrags on pre-routing
 	   and local-out, and ip_nat_out protects post-routing. */
 	IP_NF_ASSERT(!((*pskb)->nh.iph->frag_off
@@ -95,12 +91,14 @@ ip_nat_fn(unsigned int hooknum,
 		/* Exception: ICMP redirect to new connection (not in
                    hash table yet).  We must not let this through, in
                    case we're doing NAT to the same network. */
-		struct iphdr *iph = (*pskb)->nh.iph;
-		struct icmphdr *hdr = (struct icmphdr *)
-			((u_int32_t *)iph + iph->ihl);
-		if (iph->protocol == IPPROTO_ICMP
-		    && hdr->type == ICMP_REDIRECT)
+		if ((*pskb)->nh.iph->protocol == IPPROTO_ICMP) {
+			struct icmphdr hdr;
+
+			if (skb_copy_bits(*pskb, (*pskb)->nh.iph->ihl*4,
+					  &hdr, sizeof(hdr)) == 0
+			    && hdr.type == ICMP_REDIRECT)
 				return NF_DROP;
+		}
 		return NF_ACCEPT;
 	}
 
@@ -108,8 +106,11 @@ ip_nat_fn(unsigned int hooknum,
 	case IP_CT_RELATED:
 	case IP_CT_RELATED+IP_CT_IS_REPLY:
 		if ((*pskb)->nh.iph->protocol == IPPROTO_ICMP) {
-			return icmp_reply_translation(*pskb, ct, hooknum,
-						      CTINFO2DIR(ctinfo));
+			if (!icmp_reply_translation(pskb, ct, hooknum,
+						    CTINFO2DIR(ctinfo)))
+				return NF_DROP;
+			else
+				return NF_ACCEPT;
 		}
 		/* Fall thru... (Only ICMPs can be IP_CT_IS_REPLY) */
 	case IP_CT_NEW:
@@ -174,10 +175,6 @@ ip_nat_out(unsigned int hooknum,
 	   const struct net_device *out,
 	   int (*okfn)(struct sk_buff *))
 {
-	/* FIXME: Push down to extensions --RR */
-	if (skb_is_nonlinear(*pskb) && skb_linearize(*pskb, GFP_ATOMIC) != 0)
-		return NF_DROP;
-
 	/* root is playing with raw sockets. */
 	if ((*pskb)->len < sizeof(struct iphdr)
 	    || (*pskb)->nh.iph->ihl * 4 < sizeof(struct iphdr))
@@ -213,10 +210,6 @@ ip_nat_local_fn(unsigned int hooknum,
 	u_int32_t saddr, daddr;
 	unsigned int ret;
 
-	/* FIXME: Push down to extensions --RR */
-	if (skb_is_nonlinear(*pskb) && skb_linearize(*pskb, GFP_ATOMIC) != 0)
-		return NF_DROP;
-
 	/* root is playing with raw sockets. */
 	if ((*pskb)->len < sizeof(struct iphdr)
 	    || (*pskb)->nh.iph->ihl * 4 < sizeof(struct iphdr))
@@ -387,4 +380,5 @@ EXPORT_SYMBOL(ip_nat_cheat_check);
 EXPORT_SYMBOL(ip_nat_mangle_tcp_packet);
 EXPORT_SYMBOL(ip_nat_mangle_udp_packet);
 EXPORT_SYMBOL(ip_nat_used_tuple);
+EXPORT_SYMBOL(skb_ip_make_writable);
 MODULE_LICENSE("GPL");

net/ipv4/netfilter/ip_nat_tftp.c

@@ -57,9 +57,7 @@ tftp_nat_help(struct ip_conntrack *ct,
 	      struct sk_buff **pskb)
 {
 	int dir = CTINFO2DIR(ctinfo);
-	struct iphdr *iph = (*pskb)->nh.iph;
-	struct udphdr *udph = (void *)iph + iph->ihl * 4;
-	struct tftphdr *tftph = (void *)udph + 8;
+	struct tftphdr tftph;
 	struct ip_conntrack_tuple repl;
 
 	if (!((hooknum == NF_IP_POST_ROUTING && dir == IP_CT_DIR_ORIGINAL)
@@ -71,7 +69,11 @@ tftp_nat_help(struct ip_conntrack *ct,
 		return NF_ACCEPT;
 	}
 
-	switch (ntohs(tftph->opcode)) {
+	if (skb_copy_bits(*pskb, (*pskb)->nh.iph->ihl*4+sizeof(struct udphdr),
+			  &tftph, sizeof(tftph)) != 0)
+		return NF_DROP;
+
+	switch (ntohs(tftph.opcode)) {
 	/* RRQ and WRQ works the same way */
 	case TFTP_OPCODE_READ:
 	case TFTP_OPCODE_WRITE:
@@ -104,8 +106,10 @@ tftp_nat_expected(struct sk_buff **pskb,
 #if 0
 	const struct ip_conntrack_tuple *repl =
 			&master->tuplehash[IP_CT_DIR_REPLY].tuple;
-	struct iphdr *iph = (*pskb)->nh.iph;
-	struct udphdr *udph = (void *)iph + iph->ihl*4;
+	struct udphdr udph;
+
+	if (skb_copy_bits(*pskb,(*pskb)->nh.iph->ihl*4,&udph,sizeof(udph))!=0)
+		return NF_DROP;
 #endif
 
 	IP_NF_ASSERT(info);
@@ -119,8 +123,8 @@ tftp_nat_expected(struct sk_buff **pskb,
 		mr.range[0].min_ip = mr.range[0].max_ip = orig->dst.ip; 
 		DEBUGP("orig: %u.%u.%u.%u:%u <-> %u.%u.%u.%u:%u "
 			"newsrc: %u.%u.%u.%u\n",
-                        NIPQUAD((*pskb)->nh.iph->saddr), ntohs(udph->source),
-			NIPQUAD((*pskb)->nh.iph->daddr), ntohs(udph->dest),
+                        NIPQUAD((*pskb)->nh.iph->saddr), ntohs(udph.source),
+ 			NIPQUAD((*pskb)->nh.iph->daddr), ntohs(udph.dest),
 			NIPQUAD(orig->dst.ip));
 	} else {
 		mr.range[0].min_ip = mr.range[0].max_ip = orig->src.ip;
@@ -130,8 +134,8 @@ tftp_nat_expected(struct sk_buff **pskb,
 
 		DEBUGP("orig: %u.%u.%u.%u:%u <-> %u.%u.%u.%u:%u "
 			"newdst: %u.%u.%u.%u:%u\n",
-                        NIPQUAD((*pskb)->nh.iph->saddr), ntohs(udph->source),
-                        NIPQUAD((*pskb)->nh.iph->daddr), ntohs(udph->dest),
+                        NIPQUAD((*pskb)->nh.iph->saddr), ntohs(udph.source),
+                        NIPQUAD((*pskb)->nh.iph->daddr), ntohs(udph.dest),
                         NIPQUAD(orig->src.ip), ntohs(orig->src.u.udp.port));
 	}