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| author | Hannes Frederic Sowa <hannes@stressinduktion.org> | 2013-08-14 15:05:23 +0400 |
|---|---|---|
| committer | Steffen Klassert <steffen.klassert@secunet.com> | 2013-08-14 15:07:12 +0400 |
| commit | 628e341f319f1a64a4639088faba952e4ec8f0a8 (patch) | |
| tree | 28fd4b1a02ca00a1abe0b1e71898ab8db6a81dad /net/ipv4/xfrm4_output.c | |
| parent | d9bf5f130946695063469749bfd190087b7fad39 (diff) | |
| download | linux-628e341f319f1a64a4639088faba952e4ec8f0a8.tar.xz | |
xfrm: make local error reporting more robust
In xfrm4 and xfrm6 we need to take care about sockets of the other
address family. This could happen because a 6in4 or 4in6 tunnel could
get protected by ipsec.
Because we don't want to have a run-time dependency on ipv6 when only
using ipv4 xfrm we have to embed a pointer to the correct local_error
function in xfrm_state_afinet and look it up when returning an error
depending on the socket address family.
Thanks to vi0ss for the great bug report:
<https://bugzilla.kernel.org/show_bug.cgi?id=58691>
v2:
a) fix two more unsafe interpretations of skb->sk as ipv6 socket
(xfrm6_local_dontfrag and __xfrm6_output)
v3:
a) add an EXPORT_SYMBOL_GPL(xfrm_local_error) to fix a link error when
building ipv6 as a module (thanks to Steffen Klassert)
Reported-by: <vi0oss@gmail.com>
Cc: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Diffstat (limited to 'net/ipv4/xfrm4_output.c')
| -rw-r--r-- | net/ipv4/xfrm4_output.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/net/ipv4/xfrm4_output.c b/net/ipv4/xfrm4_output.c index 327a617d594c..7a5491ffa4de 100644 --- a/net/ipv4/xfrm4_output.c +++ b/net/ipv4/xfrm4_output.c @@ -33,8 +33,7 @@ static int xfrm4_tunnel_check_size(struct sk_buff *skb) mtu = dst_mtu(dst); if (skb->len > mtu) { if (skb->sk) - ip_local_error(skb->sk, EMSGSIZE, ip_hdr(skb)->daddr, - inet_sk(skb->sk)->inet_dport, mtu); + xfrm_local_error(skb, mtu); else icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu)); @@ -99,3 +98,12 @@ int xfrm4_output(struct sk_buff *skb) x->outer_mode->afinfo->output_finish, !(IPCB(skb)->flags & IPSKB_REROUTED)); } + +void xfrm4_local_error(struct sk_buff *skb, u32 mtu) +{ + struct iphdr *hdr; + + hdr = skb->encapsulation ? inner_ip_hdr(skb) : ip_hdr(skb); + ip_local_error(skb->sk, EMSGSIZE, hdr->daddr, + inet_sk(skb->sk)->inet_dport, mtu); +} |