linux-kernel - [PATCH] ipv4: fix fib metrics

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Date:	Thu, 24 Mar 2011 18:01:24 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Alessandro Suardi <alessandro.suardi@...il.com>,
	David Miller <davem@...emloft.net>
Cc:	linux-kernel@...r.kernel.org, netdev <netdev@...r.kernel.org>
Subject: [PATCH] ipv4: fix fib metrics

Le jeudi 24 mars 2011 à 17:15 +0100, Eric Dumazet a écrit :

> I am testing following patch :
> 
> diff --git a/net/ipv4/fib_semantics.c b/net/ipv4/fib_semantics.c
> index 622ac4c..654ef5b 100644
> --- a/net/ipv4/fib_semantics.c
> +++ b/net/ipv4/fib_semantics.c
> @@ -251,7 +251,7 @@ static struct fib_info *fib_find_info(const struct fib_info *nfi)
>  		    nfi->fib_prefsrc == fi->fib_prefsrc &&
>  		    nfi->fib_priority == fi->fib_priority &&
>  		    memcmp(nfi->fib_metrics, fi->fib_metrics,
> -			   sizeof(fi->fib_metrics)) == 0 &&
> +			   sizeof(u32) * RTAX_MAX) == 0 &&
>  		    ((nfi->fib_flags ^ fi->fib_flags) & ~RTNH_F_DEAD) == 0 &&
>  		    (nfi->fib_nhs == 0 || nh_comp(fi, nfi) == 0))
>  			return fi;
> 
> 

This works. Here is the formal submission :

Thanks !

[PATCH] ipv4: fix fib metrics

Alessandro Suardi reported that we could not change route metrics :

ip ro change default .... advmss 1400

This regression came with commit 9c150e82ac50 (Allocate fib metrics
dynamically). fib_metrics is no longer an array, but a pointer to an
array.

Reported-by: Alessandro Suardi <alessandro.suardi@...il.com>
Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
---
 net/ipv4/fib_semantics.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/ipv4/fib_semantics.c b/net/ipv4/fib_semantics.c
index 622ac4c..75b9fb5 100644
--- a/net/ipv4/fib_semantics.c
+++ b/net/ipv4/fib_semantics.c
@@ -251,7 +251,7 @@ static struct fib_info *fib_find_info(const struct fib_info *nfi)
 		    nfi->fib_prefsrc == fi->fib_prefsrc &&
 		    nfi->fib_priority == fi->fib_priority &&
 		    memcmp(nfi->fib_metrics, fi->fib_metrics,
-			   sizeof(fi->fib_metrics)) == 0 &&
+			   sizeof(u32) * RTAX_MAX) == 0 &&
 		    ((nfi->fib_flags ^ fi->fib_flags) & ~RTNH_F_DEAD) == 0 &&
 		    (nfi->fib_nhs == 0 || nh_comp(fi, nfi) == 0))
 			return fi;


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