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| author | Herbert Xu <herbert@gondor.apana.org.au> | 2015-09-04 07:21:06 +0200 |
|---|---|---|
| committer | Steffen Klassert <steffen.klassert@secunet.com> | 2015-09-04 09:02:59 +0200 |
| commit | 93efac3f2e03321129de67a3c0ba53048bb53e31 (patch) | |
| tree | 8c4656a196b9980fdf82788595c0324254b90a97 /net | |
| parent | Merge branch 'sctp-fixes' (diff) | |
| download | linux-93efac3f2e03321129de67a3c0ba53048bb53e31.tar.xz linux-93efac3f2e03321129de67a3c0ba53048bb53e31.zip | |
ipv6: Fix IPsec pre-encap fragmentation check
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>
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 09c76a7b474d..be033f22a3f3 100644 --- a/net/ipv6/xfrm6_output.c +++ b/net/ipv6/xfrm6_output.c @@ -136,6 +136,7 @@ static int __xfrm6_output(struct sock *sk, 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) { @@ -144,25 +145,29 @@ static int __xfrm6_output(struct sock *sk, 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(sk, skb, x->outer_mode->afinfo->output_finish); - } + +skip_frag: return x->outer_mode->afinfo->output_finish(sk, skb); } |