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| author |   Florian Westphal <fw@strlen.de> | 2018-08-03 02:22:20 +0200 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2018-08-05 17:21:14 -0700 |
| commit | 0ed4229b08c13c84a3c301a08defdc9e7f4467e6 (patch) | |
| tree | 25ed6930db15e9d4150afaaf7ad46467c496feb1 /net/ipv6/reassembly.c | |
| parent | Merge branch 'ip-Use-rb-trees-for-IP-frag-queue' (diff) | |
| download | linux-dev-0ed4229b08c13c84a3c301a08defdc9e7f4467e6.tar.xz linux-dev-0ed4229b08c13c84a3c301a08defdc9e7f4467e6.zip | |
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>
Diffstat (limited to '')
| -rw-r--r-- | net/ipv6/reassembly.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/net/ipv6/reassembly.c b/net/ipv6/reassembly.c index b4e558ab39fa..5c5b4f79296e 100644 --- a/net/ipv6/reassembly.c +++ b/net/ipv6/reassembly.c @@ -456,6 +456,10 @@ static int ipv6_frag_rcv(struct sk_buff *skb) return 1; } + if (skb->len - skb_network_offset(skb) < IPV6_MIN_MTU && + fhdr->frag_off & htons(IP6_MF)) + goto fail_hdr; + iif = skb->dev ? skb->dev->ifindex : 0; fq = fq_find(net, fhdr->identification, hdr, iif); if (fq) { |