Commit 5d150a98 authored by Florian Westphal's avatar Florian Westphal Committed by David S. Miller

ipv6: re-enable fragment header matching in ipv6_find_hdr

When ipv6_find_hdr is used to find a fragment header
(caller specifies target NEXTHDR_FRAGMENT) we erronously return
-ENOENT for all fragments with nonzero offset.

Before commit 9195bb8e, when target was specified, we did not
enter the exthdr walk loop as nexthdr == target so this used to work.

Now we do (so we can skip empty route headers). When we then stumble upon
a frag with nonzero frag_off we must return -ENOENT ("header not found")
only if the caller did not specifically request NEXTHDR_FRAGMENT.

This allows nfables exthdr expression to match ipv6 fragments, e.g. via

nft add rule ip6 filter input frag frag-off gt 0

Fixes: 9195bb8e ("ipv6: improve ipv6_find_hdr() to skip empty routing headers")
Signed-off-by: default avatarFlorian Westphal <fw@strlen.de>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent bf13c94c
...@@ -257,7 +257,11 @@ int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset, ...@@ -257,7 +257,11 @@ int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset,
*fragoff = _frag_off; *fragoff = _frag_off;
return hp->nexthdr; return hp->nexthdr;
} }
if (!found)
return -ENOENT; return -ENOENT;
if (fragoff)
*fragoff = _frag_off;
break;
} }
hdrlen = 8; hdrlen = 8;
} else if (nexthdr == NEXTHDR_AUTH) { } else if (nexthdr == NEXTHDR_AUTH) {
......
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