diff options
| author | Herbert Xu <herbert@gondor.apana.org.au> | 2015-09-04 13:21:06 +0800 |
|---|---|---|
| committer | Luis Henriques <luis.henriques@canonical.com> | 2015-11-16 11:27:17 +0000 |
| commit | e4e189d8fa58d9c57bdc80b3a971887d2376d91c (patch) | |
| tree | 1766d9f149cd17c03a620c9e059031012192f0d9 /net | |
| parent | 07b1307f41347a076258fcbbf8539293a48f8504 (diff) | |
ipv6: Fix IPsec pre-encap fragmentation check
commit 93efac3f2e03321129de67a3c0ba53048bb53e31 upstream.
The IPv6 IPsec pre-encap path performs fragmentation for tunnel-mode
packets. That is, we perform fragmentation pre-encap rather than
post-encap.
A check was added later to ensure that proper MTU information is
passed back for locally generated traffic. Unfortunately this
check was performed on all IPsec packets, including transport-mode
packets.
What's more, the check failed to take GSO into account.
The end result is that transport-mode GSO packets get dropped at
the check.
This patch fixes it by moving the tunnel mode check forward as well
as adding the GSO check.
Fixes: dd767856a36e ("xfrm6: Don't call icmpv6_send on local error")
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
[ luis: backported to 3.16: adjusted context ]
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
Diffstat (limited to 'net')
| -rw-r--r-- | net/ipv6/xfrm6_output.c | 17 |
1 files changed, 11 insertions, 6 deletions
diff --git a/net/ipv6/xfrm6_output.c b/net/ipv6/xfrm6_output.c index 433672d07d0b..0f8cd584cd3d 100644 --- a/net/ipv6/xfrm6_output.c +++ b/net/ipv6/xfrm6_output.c @@ -137,6 +137,7 @@ static int __xfrm6_output(struct sk_buff *skb) struct dst_entry *dst = skb_dst(skb); struct xfrm_state *x = dst->xfrm; int mtu; + bool toobig; #ifdef CONFIG_NETFILTER if (!x) { @@ -145,24 +146,28 @@ static int __xfrm6_output(struct sk_buff *skb) } #endif + if (x->props.mode != XFRM_MODE_TUNNEL) + goto skip_frag; + if (skb->protocol == htons(ETH_P_IPV6)) mtu = ip6_skb_dst_mtu(skb); else mtu = dst_mtu(skb_dst(skb)); - if (skb->len > mtu && xfrm6_local_dontfrag(skb)) { + toobig = skb->len > mtu && !skb_is_gso(skb); + + if (toobig && xfrm6_local_dontfrag(skb)) { xfrm6_local_rxpmtu(skb, mtu); return -EMSGSIZE; - } else if (!skb->ignore_df && skb->len > mtu && skb->sk) { + } else if (!skb->ignore_df && toobig && skb->sk) { xfrm_local_error(skb, mtu); return -EMSGSIZE; } - if (x->props.mode == XFRM_MODE_TUNNEL && - ((skb->len > mtu && !skb_is_gso(skb)) || - dst_allfrag(skb_dst(skb)))) { + if (toobig || dst_allfrag(skb_dst(skb))) return ip6_fragment(skb, x->outer_mode->afinfo->output_finish); - } + +skip_frag: return x->outer_mode->afinfo->output_finish(skb); } |