net: ipv4: use a dedicated counter for icmp_v4 redirect packets

[ Upstream commit c09551c6ff7fe16a79a42133bcecba5fc2fc3291 ]

According to the algorithm described in the comment block at the
beginning of ip_rt_send_redirect, the host should try to send
'ip_rt_redirect_number' ICMP redirect packets with an exponential
backoff and then stop sending them at all assuming that the destination
ignores redirects.
If the device has previously sent some ICMP error packets that are
rate-limited (e.g TTL expired) and continues to receive traffic,
the redirect packets will never be transmitted. This happens since
peer->rate_tokens will be typically greater than 'ip_rt_redirect_number'
and so it will never be reset even if the redirect silence timeout
(ip_rt_redirect_silence) has elapsed without receiving any packet
requiring redirects.

Fix it by using a dedicated counter for the number of ICMP redirect
packets that has been sent by the host

I have not been able to identify a given commit that introduced the
issue since ip_rt_send_redirect implements the same rate-limiting
algorithm from commit 1da177e4c3f4 ("Linux-2.6.12-rc2")

Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/include/net/inetpeer.h b/include/net/inetpeer.h
index 235c781..408d76f 100644 (file)
--- a/include/net/inetpeer.h
+++ b/include/net/inetpeer.h
@@ -40,6 +40,7 @@ struct inet_peer {
 
        u32                     metrics[RTAX_MAX];
        u32                     rate_tokens;    /* rate limiting for ICMP */
+       u32                     n_redirects;
        unsigned long           rate_last;
        union {
                struct list_head        gc_list;

diff --git a/net/ipv4/inetpeer.c b/net/ipv4/inetpeer.c
index 86fa458..0c58629 100644 (file)
--- a/net/ipv4/inetpeer.c
+++ b/net/ipv4/inetpeer.c
@@ -448,6 +448,7 @@ relookup:
                atomic_set(&p->rid, 0);
                p->metrics[RTAX_LOCK-1] = INETPEER_METRICS_NEW;
                p->rate_tokens = 0;
+               p->n_redirects = 0;
                /* 60*HZ is arbitrary, but chosen enough high so that the first
                 * calculation of tokens is at its maximum.
                 */

diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 3251ded..80ce6b0 100644 (file)
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -876,13 +876,15 @@ void ip_rt_send_redirect(struct sk_buff *skb)
        /* No redirected packets during ip_rt_redirect_silence;
         * reset the algorithm.
         */
-       if (time_after(jiffies, peer->rate_last + ip_rt_redirect_silence))
+       if (time_after(jiffies, peer->rate_last + ip_rt_redirect_silence)) {
                peer->rate_tokens = 0;
+               peer->n_redirects = 0;
+       }
 
        /* Too many ignored redirects; do not send anything
         * set dst.rate_last to the last seen redirected packet.
         */
-       if (peer->rate_tokens >= ip_rt_redirect_number) {
+       if (peer->n_redirects >= ip_rt_redirect_number) {
                peer->rate_last = jiffies;
                goto out_put_peer;
        }
@@ -899,6 +901,7 @@ void ip_rt_send_redirect(struct sk_buff *skb)
                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)