[NETFILTER]: Rename skb_ip_make_writable() to skb_make_writable()

There is nothing IPv4-specific in it.  In fact, it was already used by
IPv6, too...  Upcoming nfnetlink_queue code will use it for any kind
of packet.

Signed-off-by: Harald Welte <laforge@netfilter.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/linux/netfilter.h

@@ -193,6 +193,11 @@ extern void nf_ct_attach(struct sk_buff *, struct sk_buff *);
 /* FIXME: Before cache is ever used, this must be implemented for real. */
 extern void nf_invalidate_cache(int pf);
 
+/* Call this before modifying an existing packet: ensures it is
+   modifiable and linear to the point you care about (writable_len).
+   Returns true or false. */
+extern int skb_make_writable(struct sk_buff **pskb, unsigned int writable_len);
+
 #else /* !CONFIG_NETFILTER */
 #define NF_HOOK(pf, hook, skb, indev, outdev, okfn) (okfn)(skb)
 static inline void nf_ct_attach(struct sk_buff *new, struct sk_buff *skb) {}

include/linux/netfilter_ipv4.h

@@ -80,11 +80,6 @@ enum nf_ip_hook_priorities {
 #ifdef __KERNEL__
 extern int ip_route_me_harder(struct sk_buff **pskb);
 
-/* 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 /*__KERNEL__*/
 
 #endif /*__LINUX_IP_NETFILTER_H*/

net/core/netfilter.c

@@ -512,8 +512,9 @@ int ip_route_me_harder(struct sk_buff **pskb)
 	return 0;
 }
 EXPORT_SYMBOL(ip_route_me_harder);
+#endif /*CONFIG_INET*/
 
-int skb_ip_make_writable(struct sk_buff **pskb, unsigned int writable_len)
+int skb_make_writable(struct sk_buff **pskb, unsigned int writable_len)
 {
 	struct sk_buff *nskb;
 
@@ -540,8 +541,7 @@ copy_skb:
 	*pskb = nskb;
 	return 1;
 }
-EXPORT_SYMBOL(skb_ip_make_writable);
-#endif /*CONFIG_INET*/
+EXPORT_SYMBOL(skb_make_writable);
 
 /* Internal logging interface, which relies on the real 
    LOG target modules */

net/ipv4/netfilter/ip_nat_core.c

@@ -359,7 +359,7 @@ manip_pkt(u_int16_t proto,
 	struct iphdr *iph;
 	struct ip_nat_protocol *p;
 
-	if (!skb_ip_make_writable(pskb, iphdroff + sizeof(*iph)))
+	if (!skb_make_writable(pskb, iphdroff + sizeof(*iph)))
 		return 0;
 
 	iph = (void *)(*pskb)->data + iphdroff;
@@ -431,7 +431,7 @@ int icmp_reply_translation(struct sk_buff **pskb,
 	struct ip_conntrack_tuple inner, target;
 	int hdrlen = (*pskb)->nh.iph->ihl * 4;
 
-	if (!skb_ip_make_writable(pskb, hdrlen + sizeof(*inside)))
+	if (!skb_make_writable(pskb, hdrlen + sizeof(*inside)))
 		return 0;
 
 	inside = (void *)(*pskb)->data + (*pskb)->nh.iph->ihl*4;

net/ipv4/netfilter/ip_nat_helper.c

@@ -168,7 +168,7 @@ ip_nat_mangle_tcp_packet(struct sk_buff **pskb,
 	struct tcphdr *tcph;
 	int datalen;
 
-	if (!skb_ip_make_writable(pskb, (*pskb)->len))
+	if (!skb_make_writable(pskb, (*pskb)->len))
 		return 0;
 
 	if (rep_len > match_len
@@ -228,7 +228,7 @@ ip_nat_mangle_udp_packet(struct sk_buff **pskb,
 	                       match_offset + match_len)
 		return 0;
 
-	if (!skb_ip_make_writable(pskb, (*pskb)->len))
+	if (!skb_make_writable(pskb, (*pskb)->len))
 		return 0;
 
 	if (rep_len > match_len
@@ -315,7 +315,7 @@ ip_nat_sack_adjust(struct sk_buff **pskb,
 	optoff = (*pskb)->nh.iph->ihl*4 + sizeof(struct tcphdr);
 	optend = (*pskb)->nh.iph->ihl*4 + tcph->doff*4;
 
-	if (!skb_ip_make_writable(pskb, optend))
+	if (!skb_make_writable(pskb, optend))
 		return 0;
 
 	dir = CTINFO2DIR(ctinfo);
@@ -363,7 +363,7 @@ ip_nat_seq_adjust(struct sk_buff **pskb,
 	this_way = &ct->nat.info.seq[dir];
 	other_way = &ct->nat.info.seq[!dir];
 
-	if (!skb_ip_make_writable(pskb, (*pskb)->nh.iph->ihl*4+sizeof(*tcph)))
+	if (!skb_make_writable(pskb, (*pskb)->nh.iph->ihl*4+sizeof(*tcph)))
 		return 0;
 
 	tcph = (void *)(*pskb)->data + (*pskb)->nh.iph->ihl*4;

net/ipv4/netfilter/ip_nat_proto_icmp.c

@@ -62,7 +62,7 @@ icmp_manip_pkt(struct sk_buff **pskb,
 	struct icmphdr *hdr;
 	unsigned int hdroff = iphdroff + iph->ihl*4;
 
-	if (!skb_ip_make_writable(pskb, hdroff + sizeof(*hdr)))
+	if (!skb_make_writable(pskb, hdroff + sizeof(*hdr)))
 		return 0;
 
 	hdr = (struct icmphdr *)((*pskb)->data + hdroff);

net/ipv4/netfilter/ip_nat_proto_tcp.c

@@ -103,7 +103,7 @@ tcp_manip_pkt(struct sk_buff **pskb,
 	if ((*pskb)->len >= hdroff + sizeof(struct tcphdr))
 		hdrsize = sizeof(struct tcphdr);
 
-	if (!skb_ip_make_writable(pskb, hdroff + hdrsize))
+	if (!skb_make_writable(pskb, hdroff + hdrsize))
 		return 0;
 
 	iph = (struct iphdr *)((*pskb)->data + iphdroff);

net/ipv4/netfilter/ip_nat_proto_udp.c

@@ -94,7 +94,7 @@ udp_manip_pkt(struct sk_buff **pskb,
 	u32 oldip, newip;
 	u16 *portptr, newport;
 
-	if (!skb_ip_make_writable(pskb, hdroff + sizeof(*hdr)))
+	if (!skb_make_writable(pskb, hdroff + sizeof(*hdr)))
 		return 0;
 
 	iph = (struct iphdr *)((*pskb)->data + iphdroff);

net/ipv4/netfilter/ip_nat_snmp_basic.c

@@ -1275,7 +1275,7 @@ static int help(struct sk_buff **pskb,
 		 return NF_DROP;
 	}
 
-	if (!skb_ip_make_writable(pskb, (*pskb)->len))
+	if (!skb_make_writable(pskb, (*pskb)->len))
 		return NF_DROP;
 
 	spin_lock_bh(&snmp_lock);

net/ipv4/netfilter/ip_queue.c

@@ -388,7 +388,7 @@ ipq_mangle_ipv4(ipq_verdict_msg_t *v, struct ipq_queue_entry *e)
 		}
 		skb_put(e->skb, diff);
 	}
-	if (!skb_ip_make_writable(&e->skb, v->data_len))
+	if (!skb_make_writable(&e->skb, v->data_len))
 		return -ENOMEM;
 	memcpy(e->skb->data, v->payload, v->data_len);
 	e->skb->ip_summed = CHECKSUM_NONE;

net/ipv4/netfilter/ipt_DSCP.c

@@ -39,7 +39,7 @@ target(struct sk_buff **pskb,
 	if (((*pskb)->nh.iph->tos & IPT_DSCP_MASK) != sh_dscp) {
 		u_int16_t diffs[2];
 
-		if (!skb_ip_make_writable(pskb, sizeof(struct iphdr)))
+		if (!skb_make_writable(pskb, sizeof(struct iphdr)))
 			return NF_DROP;
 
 		diffs[0] = htons((*pskb)->nh.iph->tos) ^ 0xFFFF;

net/ipv4/netfilter/ipt_ECN.c

@@ -31,7 +31,7 @@ set_ect_ip(struct sk_buff **pskb, const struct ipt_ECN_info *einfo)
 	    != (einfo->ip_ect & IPT_ECN_IP_MASK)) {
 		u_int16_t diffs[2];
 
-		if (!skb_ip_make_writable(pskb, sizeof(struct iphdr)))
+		if (!skb_make_writable(pskb, sizeof(struct iphdr)))
 			return 0;
 
 		diffs[0] = htons((*pskb)->nh.iph->tos) ^ 0xFFFF;
@@ -66,7 +66,7 @@ set_ect_tcp(struct sk_buff **pskb, const struct ipt_ECN_info *einfo, int inward)
 	     tcph->cwr == einfo->proto.tcp.cwr)))
 		return 1;
 
-	if (!skb_ip_make_writable(pskb, (*pskb)->nh.iph->ihl*4+sizeof(*tcph)))
+	if (!skb_make_writable(pskb, (*pskb)->nh.iph->ihl*4+sizeof(*tcph)))
 		return 0;
 	tcph = (void *)(*pskb)->nh.iph + (*pskb)->nh.iph->ihl*4;
 

net/ipv4/netfilter/ipt_TCPMSS.c

@@ -58,7 +58,7 @@ ipt_tcpmss_target(struct sk_buff **pskb,
 	unsigned int i;
 	u_int8_t *opt;
 
-	if (!skb_ip_make_writable(pskb, (*pskb)->len))
+	if (!skb_make_writable(pskb, (*pskb)->len))
 		return NF_DROP;
 
 	if ((*pskb)->ip_summed == CHECKSUM_HW &&

net/ipv4/netfilter/ipt_TOS.c

@@ -33,7 +33,7 @@ target(struct sk_buff **pskb,
 	if (((*pskb)->nh.iph->tos & IPTOS_TOS_MASK) != tosinfo->tos) {
 		u_int16_t diffs[2];
 
-		if (!skb_ip_make_writable(pskb, sizeof(struct iphdr)))
+		if (!skb_make_writable(pskb, sizeof(struct iphdr)))
 			return NF_DROP;
 
 		diffs[0] = htons((*pskb)->nh.iph->tos) ^ 0xFFFF;

net/ipv6/netfilter/ip6_queue.c

@@ -384,7 +384,7 @@ ipq_mangle_ipv6(ipq_verdict_msg_t *v, struct ipq_queue_entry *e)
 		}
 		skb_put(e->skb, diff);
 	}
-	if (!skb_ip_make_writable(&e->skb, v->data_len))
+	if (!skb_make_writable(&e->skb, v->data_len))
 		return -ENOMEM;
 	memcpy(e->skb->data, v->payload, v->data_len);
 	e->skb->ip_summed = CHECKSUM_NONE;