ipv6: fix omitted netlink attributes when using RTEXT_FILTER_SKIP_STATS

JIRA: https://issues.redhat.com/browse/RHEL-96599

commit 7ac6ea4
Author: Fernando Fernandez Mancera <ffmancera@riseup.net>
Date:   Wed Apr 2 14:17:51 2025 +0200

    ipv6: fix omitted netlink attributes when using RTEXT_FILTER_SKIP_STATS

    Using RTEXT_FILTER_SKIP_STATS is incorrectly skipping non-stats IPv6
    netlink attributes on link dump. This causes issues on userspace tools,
    e.g iproute2 is not rendering address generation mode as it should due
    to missing netlink attribute.

    Move the filling of IFLA_INET6_STATS and IFLA_INET6_ICMP6STATS to a
    helper function guarded by a flag check to avoid hitting the same
    situation in the future.

    Fixes: d5566fd ("rtnetlink: RTEXT_FILTER_SKIP_STATS support to avoid dumping inet/inet6 stats")
    Signed-off-by: Fernando Fernandez Mancera <ffmancera@riseup.net>
    Reviewed-by: Simon Horman <horms@kernel.org>
    Link: https://patch.msgid.link/20250402121751.3108-1-ffmancera@riseup.net
    Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Signed-off-by: CKI Backport Bot <cki-ci-bot+cki-gitlab-backport-bot@redhat.com>

Author: CKI Backport Bot

net/ipv6/addrconf.c

@@ -5798,6 +5798,27 @@ static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
 	}
 }
 
+static int inet6_fill_ifla6_stats_attrs(struct sk_buff *skb,
+					struct inet6_dev *idev)
+{
+	struct nlattr *nla;
+
+	nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
+	if (!nla)
+		goto nla_put_failure;
+	snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
+
+	nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
+	if (!nla)
+		goto nla_put_failure;
+	snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
+
+	return 0;
+
+nla_put_failure:
+	return -EMSGSIZE;
+}
+
 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
 				  u32 ext_filter_mask)
 {
@@ -5820,18 +5841,10 @@ static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
 
 	/* XXX - MC not implemented */
 
-	if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
-		return 0;
-
-	nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
-	if (!nla)
-		goto nla_put_failure;
-	snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
-
-	nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
-	if (!nla)
-		goto nla_put_failure;
-	snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
+	if (!(ext_filter_mask & RTEXT_FILTER_SKIP_STATS)) {
+		if (inet6_fill_ifla6_stats_attrs(skb, idev) < 0)
+			goto nla_put_failure;
+	}
 
 	nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
 	if (!nla)