ipv6: fix omitted netlink attributes when using RTEXT_FILTER_SKIP_STATS

[ Upstream commit 7ac6ea4a3e0898db76aecccd68fb2c403eb7d24e ]

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: d5566fd72ec1 ("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: Sasha Levin <sashal@kernel.org>

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 8360939acf85ad428d57aa2114b7502a179e8f95..bb9add46e382a6109dadf8e26d419d2e6ed6330b 100644 (file)
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -5750,6 +5750,27 @@ 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)
 {
@@ -5771,18 +5792,10 @@ 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)