diff options
| author | Hannes Frederic Sowa <hannes@stressinduktion.org> | 2013-08-27 01:36:51 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-08-29 15:32:08 -0400 |
| commit | b800c3b966bcf004bd8592293a49ed5cb7ea67a9 (patch) | |
| tree | e10eef87a5dc18bc16745adde12dae6ff104240b /net/ipv6/ndisc.c | |
| parent | a3a975b1dfe999f3e5d38d38f2387894c4332d96 (diff) | |
ipv6: drop fragmented ndisc packets by default (RFC 6980)
This patch implements RFC6980: Drop fragmented ndisc packets by
default. If a fragmented ndisc packet is received the user is informed
that it is possible to disable the check.
Cc: Fernando Gont <fernando@gont.com.ar>
Cc: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6/ndisc.c')
| -rw-r--r-- | net/ipv6/ndisc.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c index 04d31c2fbef1..41720feeaa64 100644 --- a/net/ipv6/ndisc.c +++ b/net/ipv6/ndisc.c @@ -1519,10 +1519,27 @@ static void pndisc_redo(struct sk_buff *skb) kfree_skb(skb); } +static bool ndisc_suppress_frag_ndisc(struct sk_buff *skb) +{ + struct inet6_dev *idev = __in6_dev_get(skb->dev); + + if (!idev) + return true; + if (IP6CB(skb)->flags & IP6SKB_FRAGMENTED && + idev->cnf.suppress_frag_ndisc) { + net_warn_ratelimited("Received fragmented ndisc packet. Carefully consider disabling suppress_frag_ndisc.\n"); + return true; + } + return false; +} + int ndisc_rcv(struct sk_buff *skb) { struct nd_msg *msg; + if (ndisc_suppress_frag_ndisc(skb)) + return 0; + if (skb_linearize(skb)) return 0; |