6.5-stable review patch. If anyone has any objections, please let me know.
------------------
From: Sriram Yagnaraman <sriram.yagnaraman@xxxxxxxx>
[ Upstream commit 8423be8926aa82cd2e28bba5cc96ccb72c7ce6be ]
Route hints when the nexthop is part of a multipath group causes packets
in the same receive batch to be sent to the same nexthop irrespective of
the multipath hash of the packet. So, do not extract route hint for
packets whose destination is part of a multipath group.
A new SKB flag IP6SKB_MULTIPATH is introduced for this purpose, set the
flag when route is looked up in fib6_select_path() and use it in
ip6_can_use_hint() to check for the existence of the flag.
Fixes: 197dbf24e360 ("ipv6: introduce and uses route look hints for list input.")
Signed-off-by: Sriram Yagnaraman <sriram.yagnaraman@xxxxxxxx>
Reviewed-by: Ido Schimmel <idosch@xxxxxxxxxx>
Reviewed-by: David Ahern <dsahern@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
include/linux/ipv6.h | 1 +
net/ipv6/ip6_input.c | 3 ++-
net/ipv6/route.c | 3 +++
3 files changed, 6 insertions(+), 1 deletion(-)
diff --git a/include/linux/ipv6.h b/include/linux/ipv6.h
index 660012997f54c..644e69354cba6 100644
--- a/include/linux/ipv6.h
+++ b/include/linux/ipv6.h
@@ -146,6 +146,7 @@ struct inet6_skb_parm {
#define IP6SKB_JUMBOGRAM 128
#define IP6SKB_SEG6 256
#define IP6SKB_FAKEJUMBO 512
+#define IP6SKB_MULTIPATH 1024
};
#if defined(CONFIG_NET_L3_MASTER_DEV)
diff --git a/net/ipv6/ip6_input.c b/net/ipv6/ip6_input.c
index d94041bb42872..b8378814532ce 100644
--- a/net/ipv6/ip6_input.c
+++ b/net/ipv6/ip6_input.c
@@ -99,7 +99,8 @@ static bool ip6_can_use_hint(const struct sk_buff *skb,
static struct sk_buff *ip6_extract_route_hint(const struct net *net,
struct sk_buff *skb)
{
- if (fib6_routes_require_src(net) || fib6_has_custom_rules(net))
+ if (fib6_routes_require_src(net) || fib6_has_custom_rules(net) ||
+ IP6CB(skb)->flags & IP6SKB_MULTIPATH)
return NULL;
return skb;
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 56a55585eb798..a02328c93a537 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -424,6 +424,9 @@ void fib6_select_path(const struct net *net, struct fib6_result *res,
if (match->nh && have_oif_match && res->nh)
return;
+ 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.
*/
--
2.40.1
