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authorEric Dumazet <edumazet@google.com>2016-06-18 21:52:03 -0700
committerDavid S. Miller <davem@davemloft.net>2016-06-18 22:11:39 -0700
commit5fbba8ac9358f1e796c8aedcccc3487364643723 (patch)
tree2b96725dff29857dad4a6aca7a94d06322339ac5 /net/ipv6/icmp.c
parentb1cadc1a0949c82ff7fcb15603e3caf2d32ff9f6 (diff)
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>
Diffstat (limited to 'net/ipv6/icmp.c')
-rw-r--r--net/ipv6/icmp.c39
1 files changed, 39 insertions, 0 deletions
diff --git a/net/ipv6/icmp.c b/net/ipv6/icmp.c
index 6c57e6e90301..07bc63c23712 100644
--- a/net/ipv6/icmp.c
+++ b/net/ipv6/icmp.c
@@ -558,6 +558,45 @@ void icmpv6_param_prob(struct sk_buff *skb, u8 code, int pos)
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);