From 386e89083fb0deee943935c6981dc41af62bf457 Mon Sep 17 00:00:00 2001
From: Yu Watanabe <watanabe.yu+github@gmail.com>
Date: Fri, 8 Jan 2021 23:56:13 +0900
Subject: [PATCH] network: read RTAX_ADVMSS in received route message

---
 src/network/networkd-route.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/network/networkd-route.c b/src/network/networkd-route.c
index 7d7f8758ca..d23d74d5c8 100644
--- a/src/network/networkd-route.c
+++ b/src/network/networkd-route.c
@@ -1497,6 +1497,12 @@ int manager_rtnl_process_route(sd_netlink *rtnl, sd_netlink_message *message, Ma
                         return 0;
                 }
 
+                r = sd_netlink_message_read_u32(message, RTAX_ADVMSS, &tmp->advmss);
+                if (r < 0 && r != -ENODATA) {
+                        log_link_warning_errno(link, r, "rtnl: received route message with invalid advmss, ignoring: %m");
+                        return 0;
+                }
+
                 r = sd_netlink_message_exit_container(message);
                 if (r < 0) {
                         log_link_error_errno(link, r, "rtnl: Could not exit from RTA_METRICS container: %m");