diff options
Diffstat (limited to 'net/ipv6/icmp.c')
| -rw-r--r-- | net/ipv6/icmp.c | 39 |
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); |