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| author | Yu Watanabe <watanabe.yu+github@gmail.com> | 2021-06-06 15:18:43 +0900 |
|---|---|---|
| committer | Yu Watanabe <watanabe.yu+github@gmail.com> | 2021-06-09 04:59:23 +0900 |
| commit | e56e1a15b50e55789347d420facb004baaa9b4b6 (patch) | |
| tree | be68bfec1a72771eccc748e81af60d0a69ed6186 /src/network/networkd-sysctl.c | |
| parent | 717ba5fc90159a09d27d2893f12984ee647e11ab (diff) | |
| download | systemd-e56e1a15b50e55789347d420facb004baaa9b4b6.tar.gz | |
network: also adjust IPv6 MTU by the maximum MTU of the interface
Diffstat (limited to 'src/network/networkd-sysctl.c')
| -rw-r--r-- | src/network/networkd-sysctl.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/src/network/networkd-sysctl.c b/src/network/networkd-sysctl.c index ee5fe5f93d..a67e10e812 100644 --- a/src/network/networkd-sysctl.c +++ b/src/network/networkd-sysctl.c @@ -184,6 +184,8 @@ static int link_set_ipv6_proxy_ndp(Link *link) { } int link_set_ipv6_mtu(Link *link) { + uint32_t mtu; + assert(link); /* Make this a NOP if IPv6 is not available */ @@ -199,7 +201,14 @@ int link_set_ipv6_mtu(Link *link) { if (link->network->ipv6_mtu == 0) return 0; - return sysctl_write_ip_property_uint32(AF_INET6, link->ifname, "mtu", link->network->ipv6_mtu); + mtu = link->network->ipv6_mtu; + if (mtu > link->max_mtu) { + log_link_warning(link, "Reducing requested IPv6 MTU %"PRIu32" to the interface's maximum MTU %"PRIu32".", + mtu, link->max_mtu); + mtu = link->max_mtu; + } + + return sysctl_write_ip_property_uint32(AF_INET6, link->ifname, "mtu", mtu); } static int link_set_ipv4_accept_local(Link *link) { |