netdev - Re: [PATCH v2] Implement IP_UNICAST

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Date:	Fri, 03 Feb 2012 11:01:18 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	"Erich E. Hoover" <ehoover@...es.edu>
Cc:	Linux Netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH v2] Implement IP_UNICAST_IF socket option.

Le jeudi 02 février 2012 à 18:22 -0700, Erich E. Hoover a écrit :

> I though I should double check this, and apparently I missed that
> there's an equivalent IPV6_UNICAST_IF on "other OS".  Should that be a
> patch 2 or should it be included in this one?

Do as you prefer.

BTW, do we really want the htonl() thing, and force device indexes in
2^24 range ? This seems odd anyway.

If yes, following patch is needed :

diff --git a/net/core/dev.c b/net/core/dev.c
index f124947..ce7ebde 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -5193,7 +5193,10 @@ static int dev_new_index(struct net *net)
 {
 	static int ifindex;
 	for (;;) {
-		if (++ifindex <= 0)
+		/* Because of IP_UNICAST_IF support, we must limit indexes
+		 * to 24 bits. Zero value is also reserved.
+		 */
+		if (++ifindex >= (1<<24))
 			ifindex = 1;
 		if (!__dev_get_by_index(net, ifindex))
 			return ifindex;


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