diff options
| author | Tom Gundersen <teg@jklm.no> | 2014-08-01 15:42:08 +0200 |
|---|---|---|
| committer | Tom Gundersen <teg@jklm.no> | 2014-08-01 16:34:50 +0200 |
| commit | afe7fd56f5b5b81294dcb794214f97fc5e39dfea (patch) | |
| tree | cf575e778b793be3999ab51b918f43921df81473 /src | |
| parent | 324f818781a250b60f2fcfa74ff1c9101d2d1315 (diff) | |
networkd: track the MTU of each link
And inform the DHCPv4 clients about it.
Diffstat (limited to 'src')
| -rw-r--r-- | src/network/networkd-link.c | 27 | ||||
| -rw-r--r-- | src/network/networkd.h | 1 |
2 files changed, 24 insertions, 4 deletions
diff --git a/src/network/networkd-link.c b/src/network/networkd-link.c index ec1a97a7c..172be64a7 100644 --- a/src/network/networkd-link.c +++ b/src/network/networkd-link.c @@ -1835,6 +1835,12 @@ static int link_configure(Link *link) { if (r < 0) return r; + if (link->mtu) { + r = sd_dhcp_client_set_mtu(link->dhcp_client, link->mtu); + if (r < 0) + return r; + } + if (link->network->dhcp_mtu) { r = sd_dhcp_client_set_request_option(link->dhcp_client, DHCP_OPTION_INTERFACE_MTU); if (r < 0) @@ -2174,6 +2180,7 @@ int link_add(Manager *m, sd_rtnl_message *message, Link **ret) { int link_update(Link *link, sd_rtnl_message *m) { struct ether_addr mac; const char *ifname; + uint32_t mtu; int r; assert(link); @@ -2196,11 +2203,23 @@ int link_update(Link *link, sd_rtnl_message *m) { return -ENOMEM; } - if (!link->original_mtu) { - r = sd_rtnl_message_read_u16(m, IFLA_MTU, &link->original_mtu); - if (r >= 0) + r = sd_rtnl_message_read_u32(m, IFLA_MTU, &mtu); + if (r >= 0 && mtu > 0) { + link->mtu = mtu; + if (!link->original_mtu) { + link->original_mtu = mtu; log_debug_link(link, "saved original MTU: %" - PRIu16, link->original_mtu); + PRIu32, link->original_mtu); + } + + if (link->dhcp_client) { + r = sd_dhcp_client_set_mtu(link->dhcp_client, link->mtu); + if (r < 0) { + log_warning_link(link, "Could not update MTU in DHCP client: %s", + strerror(-r)); + return r; + } + } } /* The kernel may broadcast NEWLINK messages without the MAC address diff --git a/src/network/networkd.h b/src/network/networkd.h index 766297cff..5d7a08be0 100644 --- a/src/network/networkd.h +++ b/src/network/networkd.h @@ -174,6 +174,7 @@ struct Link { char *ifname; char *state_file; struct ether_addr mac; + uint32_t mtu; struct udev_device *udev_device; unsigned flags; |