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| author | Eric Dumazet <eric.dumazet@gmail.com> | 2011-07-21 21:25:58 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2011-07-21 21:25:58 -0700 |
| commit | 87c48fa3b4630905f98268dde838ee43626a060c (patch) | |
| tree | 1374b52ed0514682f836cfa0a6a683eb549c9613 /net/ipv6/udp.c | |
| parent | 21efcfa0ff27776902a8a15e810147be4d937d69 (diff) | |
| download | lwn-87c48fa3b4630905f98268dde838ee43626a060c.tar.gz lwn-87c48fa3b4630905f98268dde838ee43626a060c.zip | |
ipv6: make fragment identifications less predictable
IPv6 fragment identification generation is way beyond what we use for
IPv4 : It uses a single generator. Its not scalable and allows DOS
attacks.
Now inetpeer is IPv6 aware, we can use it to provide a more secure and
scalable frag ident generator (per destination, instead of system wide)
This patch :
1) defines a new secure_ipv6_id() helper
2) extends inet_getid() to provide 32bit results
3) extends ipv6_select_ident() with a new dest parameter
Reported-by: Fernando Gont <fernando@gont.com.ar>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6/udp.c')
| -rw-r--r-- | net/ipv6/udp.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c index 328985c40883..29213b51c499 100644 --- a/net/ipv6/udp.c +++ b/net/ipv6/udp.c @@ -1359,7 +1359,7 @@ static struct sk_buff *udp6_ufo_fragment(struct sk_buff *skb, u32 features) fptr = (struct frag_hdr *)(skb_network_header(skb) + unfrag_ip6hlen); fptr->nexthdr = nexthdr; fptr->reserved = 0; - ipv6_select_ident(fptr); + ipv6_select_ident(fptr, (struct rt6_info *)skb_dst(skb)); /* Fragment the skb. ipv6 header and the remaining fields of the * fragment header are updated in ipv6_gso_segment() |