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authorThomas Graf <tgraf@suug.ch>2007-12-10 16:53:29 -0800
committerDavid S. Miller <davem@sunset.davemloft.net>2007-12-11 02:45:27 -0800
commit95a02cfd4d33886c166d4a5f309120f8d32ced58 (patch)
treecae6142cca5d521db3f6471321cf31903eb2f7ba /net/ipv6/esp6.c
parent2017a72c070033830b460d31cd4703f9d2ec0d56 (diff)
downloadlinux-2.6.38-lt-ux500-95a02cfd4d33886c166d4a5f309120f8d32ced58.tar.gz
[IPv6] ESP: Discard dummy packets introduced in rfc4303
RFC4303 introduces dummy packets with a nexthdr value of 59 to implement traffic confidentiality. Such packets need to be dropped silently and the payload may not be attempted to be parsed as it consists of random chunk. Signed-off-by: Thomas Graf <tgraf@suug.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6/esp6.c')
-rw-r--r--net/ipv6/esp6.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/net/ipv6/esp6.c b/net/ipv6/esp6.c
index 7db66f10e00..44405325467 100644
--- a/net/ipv6/esp6.c
+++ b/net/ipv6/esp6.c
@@ -230,6 +230,12 @@ static int esp6_input(struct xfrm_state *x, struct sk_buff *skb)
}
/* ... check padding bits here. Silly. :-) */
+ /* RFC4303: Drop dummy packets without any error */
+ if (nexthdr[1] == IPPROTO_NONE) {
+ ret = -EINVAL;
+ goto out;
+ }
+
pskb_trim(skb, skb->len - alen - padlen - 2);
ret = nexthdr[1];
}