netdev - Re: [PATCH net v2 2/3] ipv6: ignore dst hint for multipath routes

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Date: Sun, 27 Aug 2023 18:45:38 +0300
From: Ido Schimmel <idosch@...sch.org>
To: Sriram Yagnaraman <sriram.yagnaraman@....tech>
Cc: netdev@...r.kernel.org, linux-kselftest@...r.kernel.org,
	"David S . Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	David Ahern <dsahern@...nel.org>, Ido Schimmel <idosch@...dia.com>,
	Shuah Khan <shuah@...nel.org>, Petr Machata <petrm@...dia.com>
Subject: Re: [PATCH net v2 2/3] ipv6: ignore dst hint for multipath routes

On Fri, Aug 25, 2023 at 11:08:29AM +0200, Sriram Yagnaraman wrote:
> diff --git a/net/ipv6/route.c b/net/ipv6/route.c
> index 56a55585eb79..4631e03c84b4 100644
> --- a/net/ipv6/route.c
> +++ b/net/ipv6/route.c
> @@ -424,6 +424,8 @@ void fib6_select_path(const struct net *net, struct fib6_result *res,
>  	if (match->nh && have_oif_match && res->nh)
>  		return;
>  
> +	IP6CB(skb)->flags |= IP6SKB_MULTIPATH;

skb can be NULL here in case this is called as part of route query from
user space, so we need:

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 4631e03c84b4..a02328c93a53 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -424,7 +424,8 @@ void fib6_select_path(const struct net *net, struct fib6_result *res,
        if (match->nh && have_oif_match && res->nh)
                return;
 
-       IP6CB(skb)->flags |= IP6SKB_MULTIPATH;
+       if (skb)
+               IP6CB(skb)->flags |= IP6SKB_MULTIPATH;
 
        /* We might have already computed the hash for ICMPv6 errors. In such
         * case it will always be non-zero. Otherwise now is the time to do it.