summaryrefslogtreecommitdiff
path: root/net/ipv6/reassembly.c
diff options
context:
space:
mode:
authorFlorian Westphal <fw@strlen.de>2018-08-03 03:22:20 +0300
committerDavid S. Miller <davem@davemloft.net>2018-08-06 03:21:14 +0300
commit0ed4229b08c13c84a3c301a08defdc9e7f4467e6 (patch)
tree25ed6930db15e9d4150afaaf7ad46467c496feb1 /net/ipv6/reassembly.c
parentc30f1fc041b74ecdb072dd44f858750414b8b19f (diff)
downloadlinux-0ed4229b08c13c84a3c301a08defdc9e7f4467e6.tar.xz
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 'net/ipv6/reassembly.c')
-rw-r--r--net/ipv6/reassembly.c4
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) {