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ipv6: defrag: drop non-last frags smaller than min mtu
don't bother with pathological cases, they only waste cycles.
IPv6 requires a minimum MTU of 1280 so we should never see fragments
smaller than this (except last frag).
v3: don't use awkward "-offset + len"
v2: drop IPv4 part, which added same check w. IPV4_MIN_MTU (68).
There were concerns that there could be even smaller frags
generated by intermediate nodes, e.g. on radio networks.
Cc: Peter Oskolkov <posk@google.com>
Cc: Eric Dumazet <edumazet@google.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
(cherry picked from commit 0ed4229b08
)
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
parent
3bde783eca
commit
5123ffdad6
2 changed files with 8 additions and 0 deletions
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@ -565,6 +565,10 @@ int nf_ct_frag6_gather(struct net *net, struct sk_buff *skb, u32 user)
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hdr = ipv6_hdr(skb);
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fhdr = (struct frag_hdr *)skb_transport_header(skb);
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if (skb->len - skb_network_offset(skb) < IPV6_MIN_MTU &&
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fhdr->frag_off & htons(IP6_MF))
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return -EINVAL;
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skb_orphan(skb);
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fq = fq_find(net, fhdr->identification, user, hdr,
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skb->dev ? skb->dev->ifindex : 0);
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@ -522,6 +522,10 @@ static int ipv6_frag_rcv(struct sk_buff *skb)
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return 1;
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}
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if (skb->len - skb_network_offset(skb) < IPV6_MIN_MTU &&
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fhdr->frag_off & htons(IP6_MF))
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goto fail_hdr;
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iif = skb->dev ? skb->dev->ifindex : 0;
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fq = fq_find(net, fhdr->identification, hdr, iif);
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if (fq) {
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