ipv4: tcp: send zero IPID in SYNACK messages

In commit a8bd9f47a19a ("ipv4: tcp: send zero IPID for RST and
ACK sent in SYN-RECV and TIME-WAIT state") we took care of some
ctl packets sent by TCP.

It turns out we need to use a similar strategy for SYNACK packets.

By default, they carry IP_DF and IPID==0, but there are ways
to ask them to use the hashed IP ident generator and thus
be used to build off-path attacks.
(Ref: Off-Path TCP Exploits of the Mixed IPID Assignment)

One of this way is to force (before listener is started)
echo 1 >/proc/sys/net/ipv4/ip_no_pmtu_disc

Another way is using forged ICMP ICMP_FRAG_NEEDED
with a very small MTU (like 68) to force a false return from
ip_dont_fragment()

In this patch, ip_build_and_send_pkt() uses the following
heuristics.

1) Most SYNACK packets are smaller than IPV4_MIN_MTU and therefore
can use IP_DF regardless of the listener or route pmtu setting.

2) In case the SYNACK packet is bigger than IPV4_MIN_MTU,
we use prandom_u32() generator instead of the IPv4 hashed ident one.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Ray Che <xijiache@gmail.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Cc: Geoff Alexander <alexandg@cs.unm.edu>
Cc: Willy Tarreau <w@1wt.eu>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c
index e331c8d4e6cfc4f2199a7877d8257b3b3b519561..139cec29ed06cd092ebdfd2bf0d13aaf67c5359d 100644 (file)
--- a/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -162,12 +162,19 @@ int ip_build_and_send_pkt(struct sk_buff *skb, const struct sock *sk,
        iph->daddr    = (opt && opt->opt.srr ? opt->opt.faddr : daddr);
        iph->saddr    = saddr;
        iph->protocol = sk->sk_protocol;
-       if (ip_dont_fragment(sk, &rt->dst)) {
+       /* Do not bother generating IPID for small packets (eg SYNACK) */
+       if (skb->len <= IPV4_MIN_MTU || ip_dont_fragment(sk, &rt->dst)) {
                iph->frag_off = htons(IP_DF);
                iph->id = 0;
        } else {
                iph->frag_off = 0;
-               __ip_select_ident(net, iph, 1);
+               /* TCP packets here are SYNACK with fat IPv4/TCP options.
+                * Avoid using the hashed IP ident generator.
+                */
+               if (sk->sk_protocol == IPPROTO_TCP)
+                       iph->id = (__force __be16)prandom_u32();
+               else
+                       __ip_select_ident(net, iph, 1);
        }
 
        if (opt && opt->opt.optlen) {