netdev - [PATCH net-next] ipv4: Remove RTO

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Message-ID: <57de760565cab55df7b129f523530ac6475865b2.1712754146.git.gnault@redhat.com>
Date: Wed, 10 Apr 2024 15:14:29 +0200
From: Guillaume Nault <gnault@...hat.com>
To: David Miller <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>, Eric Dumazet <edumazet@...gle.com>
Cc: netdev@...r.kernel.org, David Ahern <dsahern@...nel.org>
Subject: [PATCH net-next] ipv4: Remove RTO_ONLINK.

RTO_ONLINK was a flag used in ->flowi4_tos that allowed to alter the
scope of an IPv4 route lookup. Setting this flag was equivalent to
specifying RT_SCOPE_LINK in ->flowi4_scope.

With commit ec20b2830093 ("ipv4: Set scope explicitly in
ip_route_output()."), the last users of RTO_ONLINK have been removed.
Therefore, we can now drop the code that checked this bit and stop
modifying ->flowi4_scope in ip_route_output_key_hash().

Signed-off-by: Guillaume Nault <gnault@...hat.com>
---
 include/net/route.h |  2 --
 net/ipv4/route.c    | 14 +-------------
 2 files changed, 1 insertion(+), 15 deletions(-)

diff --git a/include/net/route.h b/include/net/route.h
index 315a8acee6c6..630d1ef6868a 100644
--- a/include/net/route.h
+++ b/include/net/route.h
@@ -35,8 +35,6 @@
 #include <linux/cache.h>
 #include <linux/security.h>
 
-#define RTO_ONLINK	0x01
-
 static inline __u8 ip_sock_rt_scope(const struct sock *sk)
 {
 	if (sock_flag(sk, SOCK_LOCALROUTE))
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index c8f76f56dc16..bc6759e07a6f 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -106,9 +106,6 @@
 
 #include "fib_lookup.h"
 
-#define RT_FL_TOS(oldflp4) \
-	((oldflp4)->flowi4_tos & (IPTOS_RT_MASK | RTO_ONLINK))
-
 #define RT_GC_TIMEOUT (300*HZ)
 
 #define DEFAULT_MIN_PMTU (512 + 20 + 20)
@@ -498,15 +495,6 @@ void __ip_select_ident(struct net *net, struct iphdr *iph, int segs)
 }
 EXPORT_SYMBOL(__ip_select_ident);
 
-static void ip_rt_fix_tos(struct flowi4 *fl4)
-{
-	__u8 tos = RT_FL_TOS(fl4);
-
-	fl4->flowi4_tos = tos & IPTOS_RT_MASK;
-	if (tos & RTO_ONLINK)
-		fl4->flowi4_scope = RT_SCOPE_LINK;
-}
-
 static void __build_flow_key(const struct net *net, struct flowi4 *fl4,
 			     const struct sock *sk, const struct iphdr *iph,
 			     int oif, __u8 tos, u8 prot, u32 mark,
@@ -2638,7 +2626,7 @@ struct rtable *ip_route_output_key_hash(struct net *net, struct flowi4 *fl4,
 	struct rtable *rth;
 
 	fl4->flowi4_iif = LOOPBACK_IFINDEX;
-	ip_rt_fix_tos(fl4);
+	fl4->flowi4_tos &= IPTOS_RT_MASK;
 
 	rcu_read_lock();
 	rth = ip_route_output_key_hash_rcu(net, fl4, &res, skb);
-- 
2.39.2