Re: [PATCH net-next v5] ipv6: add IFLA_INET6_RA_MTU to expose mtu value
From: David Ahern <hidden>
Date: 2021-08-27 05:28:39
Also in:
linux-arm-kernel, linux-mediatek, lkml
On 8/25/21 11:46 PM, Rocco Yue wrote:
quoted hunk ↗ jump to hunk
@@ -5651,6 +5654,9 @@ static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev, if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode)) goto nla_put_failure; + if (nla_put_u32(skb, IFLA_INET6_RA_MTU, idev->ra_mtu))
I should have seen this earlier. The intent here is to only notify userspace if the RA contains an MTU in which case this should be if (idev->ra_mtu && nla_put_u32(skb, IFLA_INET6_RA_MTU, idev->ra_mtu)) and in which case idev->ra_mtu should be initialized to 0 explicitly, not U32_MIN.