netdev - Re: Fix "ipOutNoRoutes" counter error for TCP and UDP

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Message-ID: <465E2202.3000607@cn.fujitsu.com>
Date:	Thu, 31 May 2007 09:16:50 +0800
From:	Wei Dong <weidong@...fujitsu.com>
To:	davem@...emloft.net
CC:	netdev@...r.kernel.org
Subject: Re: Fix "ipOutNoRoutes" counter error for TCP and UDP

Hi Mr. David
  I have modified my patch according to you advice. I think -
EHOSTUNREACH is only for "input path". In "output" path, we can just
simply check-ENETUNREACH  (^_^), the patch is shown in the end of this mail.

 I send this patch to you several weeks ago, but you have not replied to me.
This patch is not correctly?


>>>> >> >> Function need to fix:
>>>> >> >> tcp_v4_connect(); ip4_datagram_connect(); udp_sendmsg();
>> >>

>> > > I think we need to make these checks more carefully.
>> > >
>> > > Route lookup can fail for several reasons other than
>> > > no route being available.  Two examples are:
>> > >
>> > > 1) Out of memory error while creating route
>> > > 2) IPSEC disallows communication to that flow ID
>> > >
>> > > As a result, we'll probably best limiting the counter
>> > > increment when the error is either -EHOSTUNREACH or
>> > > -ENETUNREACH.
> >

signed-off-by: Wei Dong <weidong@...fujitsu.com>


diff -ruNp a/net/ipv4/datagram.c b/net/ipv4/datagram.c
--- a/net/ipv4/datagram.c    2007-04-25 15:20:19.000000000 +0800
+++ b/net/ipv4/datagram.c    2007-04-25 15:21:42.000000000 +0800
@@ -50,8 +50,12 @@ int ip4_datagram_connect(struct sock *sk
                    RT_CONN_FLAGS(sk), oif,
                    sk->sk_protocol,
                    inet->sport, usin->sin_port, sk);
-    if (err)
+    if (err) {
+        if (err == -ENETUNREACH)
+            IP_INC_STATS_BH(IPSTATS_MIB_OUTNOROUTES);
         return err;
+    }
+
     if ((rt->rt_flags & RTCF_BROADCAST) && !sock_flag(sk, SOCK_BROADCAST)) {
         ip_rt_put(rt);
         return -EACCES;
diff -ruNp a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
--- a/net/ipv4/tcp_ipv4.c    2007-04-25 15:20:19.000000000 +0800
+++ b/net/ipv4/tcp_ipv4.c    2007-04-25 15:21:42.000000000 +0800
@@ -192,8 +192,11 @@ int tcp_v4_connect(struct sock *sk, stru
                    RT_CONN_FLAGS(sk), sk->sk_bound_dev_if,
                    IPPROTO_TCP,
                    inet->sport, usin->sin_port, sk);
-    if (tmp < 0)
+    if (tmp < 0) {
+        if (tmp == -ENETUNREACH)
+            IP_INC_STATS_BH(IPSTATS_MIB_OUTNOROUTES);
         return tmp;
+    }

     if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) {
         ip_rt_put(rt);
diff -ruNp a/net/ipv4/udp.c b/net/ipv4/udp.c
--- a/net/ipv4/udp.c    2007-04-25 15:20:19.000000000 +0800
+++ b/net/ipv4/udp.c    2007-04-25 15:21:42.000000000 +0800
@@ -630,8 +630,11 @@ int udp_sendmsg(struct kiocb *iocb, stru
                          .dport = dport } } };
         security_sk_classify_flow(sk, &fl);
         err = ip_route_output_flow(&rt, &fl, sk,
!(msg->msg_flags&MSG_DONTWAIT));
-        if (err)
+        if (err) {
+            if (err == -ENETUNREACH)
+                IP_INC_STATS_BH(IPSTATS_MIB_OUTNOROUTES);
             goto out;
+        }

         err = -EACCES;
         if ((rt->rt_flags & RTCF_BROADCAST) &&
-
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