Subject: [PATCH net-next 1/6] net: fib_rules: Add DSCP selector attribute

From: Ido Schimmel <[email-masked]>
Date: Wed, 11 Sep 2024 12:37:43 +0300

The FIB rule TOS selector is implemented differently between IPv4 and
IPv6. In IPv4 it is used to match on the three "Type of Services" bits
specified in RFC 791, while in IPv6 is it is used to match on the six
DSCP bits specified in RFC 2474.

Add a new FIB rule attribute to allow matching on DSCP. The attribute
will be used to implement a 'dscp' selector in ip-rule with a consistent
behavior between IPv4 and IPv6.

For now, set the type of the attribute to 'NLA_REJECT' so that user
space will not be able to configure it. This restriction will be lifted
once both IPv4 and IPv6 support the new attribute.

Signed-off-by: Ido Schimmel <[email-masked]>
---
 include/uapi/linux/fib_rules.h | 1 +
 net/core/fib_rules.c           | 3 ++-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/include/uapi/linux/fib_rules.h b/include/uapi/linux/fib_rules.h
index 232df14e1287..a6924dd3aff1 100644
--- a/include/uapi/linux/fib_rules.h
+++ b/include/uapi/linux/fib_rules.h
@@ -67,6 +67,7 @@ enum {
 	FRA_IP_PROTO,	/* ip proto */
 	FRA_SPORT_RANGE, /* sport */
 	FRA_DPORT_RANGE, /* dport */
+	FRA_DSCP,	/* dscp */
 	__FRA_MAX
 };
 
diff --git a/net/core/fib_rules.c b/net/core/fib_rules.c
index 5a4eb744758c..df41c05f7234 100644
--- a/net/core/fib_rules.c
+++ b/net/core/fib_rules.c
@@ -766,7 +766,8 @@ static const struct nla_policy fib_rule_policy[FRA_MAX + 1] = {
 	[FRA_PROTOCOL]  = { .type = NLA_U8 },
 	[FRA_IP_PROTO]  = { .type = NLA_U8 },
 	[FRA_SPORT_RANGE] = { .len = sizeof(struct fib_rule_port_range) },
-	[FRA_DPORT_RANGE] = { .len = sizeof(struct fib_rule_port_range) }
+	[FRA_DPORT_RANGE] = { .len = sizeof(struct fib_rule_port_range) },
+	[FRA_DSCP]	= { .type = NLA_REJECT },
 };
 
 int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr *nlh,
-- 
2.46.0