ipip/rtnl: add IFLA_IPTUN_PMTUDISC on dump

This parameter was missing in the dump.
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/uapi/linux/if_tunnel.h

@@ -48,6 +48,7 @@ enum {
 	IFLA_IPTUN_FLOWINFO,
 	IFLA_IPTUN_FLAGS,
 	IFLA_IPTUN_PROTO,
+	IFLA_IPTUN_PMTUDISC,
 	__IFLA_IPTUN_MAX,
 };
 #define IFLA_IPTUN_MAX	(__IFLA_IPTUN_MAX - 1)

net/ipv4/ipip.c

@@ -835,6 +835,8 @@ static size_t ipip_get_size(const struct net_device *dev)
 		nla_total_size(1) +
 		/* IFLA_IPTUN_TOS */
 		nla_total_size(1) +
+		/* IFLA_IPTUN_PMTUDISC */
+		nla_total_size(1) +
 		0;
 }
 
@@ -847,7 +849,9 @@ static int ipip_fill_info(struct sk_buff *skb, const struct net_device *dev)
 	    nla_put_be32(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) ||
 	    nla_put_be32(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) ||
 	    nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) ||
-	    nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos))
+	    nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos) ||
+	    nla_put_u8(skb, IFLA_IPTUN_PMTUDISC,
+		       !!(parm->iph.frag_off & htons(IP_DF))))
 		goto nla_put_failure;
 	return 0;