net: ipv4: avoid mixed n_redirects and rate_tokens usage

Since commit ab7c72331696 ("net: ipv4: use a dedicated counter
for icmp_v4 redirect packets") we use 'n_redirects' to account
for redirect packets, but we still use 'rate_tokens' to compute
the redirect packets exponential backoff.

If the device sent to the relevant peer any ICMP error packet
after sending a redirect, it will also update 'rate_token' according
to the leaking bucket schema; typically 'rate_token' will raise
above BITS_PER_LONG and the redirect packets backoff algorithm
will produce undefined behavior.

Fix the issue using 'n_redirects' to compute the exponential backoff
in ip_rt_send_redirect().

Note that we still clear rate_tokens after a redirect silence period,
to avoid changing an established behaviour.

The root cause predates git history; before the mentioned commit in
the critical scenario, the kernel stopped sending redirects, after
the mentioned commit the behavior more randomic.

Reported-by: Xiumei Mu <xmu@redhat.com>
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Fixes: ab7c72331696 ("net: ipv4: use a dedicated counter for icmp_v4 redirect packets")
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Acked-by: Lorenzo Bianconi <lorenzo.bianconi@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 7dcce724c78bd6bfbffb66671d594803031b13b6..14654876127e4f166d14b19975d707eae8637279 100644 (file)
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -916,16 +916,15 @@ void ip_rt_send_redirect(struct sk_buff *skb)
        if (peer->rate_tokens == 0 ||
            time_after(jiffies,
                       (peer->rate_last +
-                       (ip_rt_redirect_load << peer->rate_tokens)))) {
+                       (ip_rt_redirect_load << peer->n_redirects)))) {
                __be32 gw = rt_nexthop(rt, ip_hdr(skb)->daddr);
 
                icmp_send(skb, ICMP_REDIRECT, ICMP_REDIR_HOST, gw);
                peer->rate_last = jiffies;
-               ++peer->rate_tokens;
                ++peer->n_redirects;
 #ifdef CONFIG_IP_ROUTE_VERBOSE
                if (log_martians &&
-                   peer->rate_tokens == ip_rt_redirect_number)
+                   peer->n_redirects == ip_rt_redirect_number)
                        net_warn_ratelimited("host %pI4/if%d ignores redirects for %pI4 to %pI4\n",
                                             &ip_hdr(skb)->saddr, inet_iif(skb),
                                             &ip_hdr(skb)->daddr, &gw);