commit ba8fd2d277fcc06905a45380a2203c4bd9d8d025
Author: Herbert Xu <[EMAIL PROTECTED]>
Date: Wed Mar 5 14:46:35 2008 -0800
IPV6: Fix IPsec datagram fragmentation
Upstream commits: 28a89453b1e8de8d777ad96fa1eef27b5d1ce074
b5c15fc004ac83b7ad280acbe0fd4bbed7e2c8d4
This is a long-standing bug in the IPsec IPv6 code that breaks
when we emit a IPsec tunnel-mode datagram packet. The problem
is that the code the emits the packet assumes the IPv6 stack
will fragment it later, but the IPv6 stack assumes that whoever
is emitting the packet is going to pre-fragment the packet.
In the long term we need to fix both sides, e.g., to get the
datagram code to pre-fragment as well as to get the IPv6 stack
to fragment locally generated tunnel-mode packet.
For now this patch does the second part which should make it
work for the IPsec host case.
Signed-off-by: Herbert Xu <[EMAIL PROTECTED]>
Signed-off-by: David S. Miller <[EMAIL PROTECTED]>
Signed-off-by: Greg Kroah-Hartman <[EMAIL PROTECTED]>
Signed-off-by: Chris Wright <[EMAIL PROTECTED]>
diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index 2f59baa..5b4095b 100644
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -593,7 +593,7 @@ static int ip6_fragment(struct sk_buff *skb, int
(*output)(struct sk_buff *))
* or if the skb it not generated by a local socket. (This last
* check should be redundant, but it's free.)
*/
- if (!np || np->pmtudisc >= IPV6_PMTUDISC_DO) {
+ if (!skb->local_df) {
skb->dev = skb->dst->dev;
icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, skb->dev);
IP6_INC_STATS(ip6_dst_idev(skb->dst), IPSTATS_MIB_FRAGFAILS);
@@ -1389,6 +1389,10 @@ int ip6_push_pending_frames(struct sock *sk)
tmp_skb->sk = NULL;
}
+ /* Allow local fragmentation. */
+ if (np->pmtudisc < IPV6_PMTUDISC_DO)
+ skb->local_df = 1;
+
ipv6_addr_copy(final_dst, &fl->fl6_dst);
__skb_pull(skb, skb_network_header_len(skb));
if (opt && opt->opt_flen)
diff --git a/net/ipv6/xfrm6_output.c b/net/ipv6/xfrm6_output.c
index 6569767..dc22909 100644
--- a/net/ipv6/xfrm6_output.c
+++ b/net/ipv6/xfrm6_output.c
@@ -34,7 +34,7 @@ static int xfrm6_tunnel_check_size(struct sk_buff *skb)
if (mtu < IPV6_MIN_MTU)
mtu = IPV6_MIN_MTU;
- if (skb->len > mtu) {
+ if (!skb->local_df && skb->len > mtu) {
skb->dev = dst->dev;
icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, skb->dev);
ret = -EMSGSIZE;
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