ip6: move ipip6_err_gen_icmpv6_unreach()
We want to use this helper from GRE as well, so this is
the time to move it in net/ipv6/icmp.c
Also add a @nhs parameter, since SIT and GRE have different
values for the header(s) to skip.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/icmpv6.h b/include/linux/icmpv6.h
index 432611a..9796481 100644
--- a/include/linux/icmpv6.h
+++ b/include/linux/icmpv6.h
@@ -18,6 +18,7 @@
const struct in6_addr *force_saddr);
extern int inet6_register_icmp_sender(ip6_icmp_send_t *fn);
extern int inet6_unregister_icmp_sender(ip6_icmp_send_t *fn);
+int ip6_err_gen_icmpv6_unreach(struct sk_buff *skb, int nhs);
#else
diff --git a/net/ipv6/icmp.c b/net/ipv6/icmp.c
index 6c57e6e..07bc63c 100644
--- a/net/ipv6/icmp.c
+++ b/net/ipv6/icmp.c
@@ -558,6 +558,45 @@
kfree_skb(skb);
}
+/* Generate icmpv6 with type/code ICMPV6_DEST_UNREACH/ICMPV6_ADDR_UNREACH
+ * if sufficient data bytes are available
+ * @nhs is the size of the tunnel header(s) :
+ * Either an IPv4 header for SIT encap
+ * an IPv4 header + GRE header for GRE encap
+ */
+int ip6_err_gen_icmpv6_unreach(struct sk_buff *skb, int nhs)
+{
+ struct rt6_info *rt;
+ struct sk_buff *skb2;
+
+ if (!pskb_may_pull(skb, nhs + sizeof(struct ipv6hdr) + 8))
+ return 1;
+
+ skb2 = skb_clone(skb, GFP_ATOMIC);
+
+ if (!skb2)
+ return 1;
+
+ skb_dst_drop(skb2);
+ skb_pull(skb2, nhs);
+ skb_reset_network_header(skb2);
+
+ rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr, NULL, 0, 0);
+
+ if (rt && rt->dst.dev)
+ skb2->dev = rt->dst.dev;
+
+ icmpv6_send(skb2, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);
+
+ if (rt)
+ ip6_rt_put(rt);
+
+ kfree_skb(skb2);
+
+ return 0;
+}
+EXPORT_SYMBOL(ip6_err_gen_icmpv6_unreach);
+
static void icmpv6_echo_reply(struct sk_buff *skb)
{
struct net *net = dev_net(skb->dev);
diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c
index d9f2bd6..78e84d6 100644
--- a/net/ipv6/sit.c
+++ b/net/ipv6/sit.c
@@ -479,42 +479,6 @@
dev_put(dev);
}
-/* Generate icmpv6 with type/code ICMPV6_DEST_UNREACH/ICMPV6_ADDR_UNREACH
- * if sufficient data bytes are available
- */
-static int ipip6_err_gen_icmpv6_unreach(struct sk_buff *skb)
-{
- int ihl = ((const struct iphdr *)skb->data)->ihl*4;
- struct rt6_info *rt;
- struct sk_buff *skb2;
-
- if (!pskb_may_pull(skb, ihl + sizeof(struct ipv6hdr) + 8))
- return 1;
-
- skb2 = skb_clone(skb, GFP_ATOMIC);
-
- if (!skb2)
- return 1;
-
- skb_dst_drop(skb2);
- skb_pull(skb2, ihl);
- skb_reset_network_header(skb2);
-
- rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr, NULL, 0, 0);
-
- if (rt && rt->dst.dev)
- skb2->dev = rt->dst.dev;
-
- icmpv6_send(skb2, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);
-
- if (rt)
- ip6_rt_put(rt);
-
- kfree_skb(skb2);
-
- return 0;
-}
-
static int ipip6_err(struct sk_buff *skb, u32 info)
{
const struct iphdr *iph = (const struct iphdr *)skb->data;
@@ -575,7 +539,7 @@
goto out;
err = 0;
- if (!ipip6_err_gen_icmpv6_unreach(skb))
+ if (!ip6_err_gen_icmpv6_unreach(skb, iph->ihl * 4))
goto out;
if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED)