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networkd: track the MTU of each link

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And inform the DHCPv4 clients about it.
This commit is contained in:
Tom Gundersen 2014-08-01 15:42:08 +02:00
parent 324f818781
commit afe7fd56f5
2 changed files with 24 additions and 4 deletions
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27
src/network/networkd-link.c
View File

@ -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

1
src/network/networkd.h
View File

@ -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;