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sd-dhcp-client/networkd: add interface MTU support
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eb2f9b1802
commit
4f882b2a50
@ -253,6 +253,13 @@
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be used, and take precedence over any statically configured ones.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>UseMTU</varname></term>
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<listitem>
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<para>When true (the default) the interface maximum transmission unit
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from the DHCP server will be used on the current link.</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect2>
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@ -104,6 +104,7 @@ enum {
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DHCP_OPTION_DOMAIN_NAME_SERVER = 6,
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DHCP_OPTION_HOST_NAME = 12,
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DHCP_OPTION_DOMAIN_NAME = 15,
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DHCP_OPTION_INTERFACE_MTU = 26,
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DHCP_OPTION_NTP_SERVER = 42,
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DHCP_OPTION_REQUESTED_IP_ADDRESS = 50,
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DHCP_OPTION_IP_ADDRESS_LEASE_TIME = 51,
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@ -42,6 +42,7 @@ struct DHCPLease {
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be32_t subnet_mask;
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be32_t router;
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struct in_addr **dns;
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uint16_t mtu;
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};
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typedef struct DHCPLease DHCPLease;
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@ -186,10 +187,10 @@ int sd_dhcp_client_get_address(sd_dhcp_client *client, struct in_addr *addr)
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return 0;
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}
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int sd_dhcp_client_get_netmask(sd_dhcp_client *client, struct in_addr *addr)
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int sd_dhcp_client_get_mtu(sd_dhcp_client *client, uint16_t *mtu)
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{
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assert_return(client, -EINVAL);
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assert_return(addr, -EINVAL);
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assert_return(mtu, -EINVAL);
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switch (client->state) {
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case DHCP_STATE_INIT:
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@ -202,7 +203,10 @@ int sd_dhcp_client_get_netmask(sd_dhcp_client *client, struct in_addr *addr)
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case DHCP_STATE_BOUND:
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case DHCP_STATE_RENEWING:
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case DHCP_STATE_REBINDING:
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addr->s_addr = client->lease->subnet_mask;
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if (client->lease->mtu)
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*mtu = client->lease->mtu;
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else
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return -ENOENT;
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break;
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}
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@ -277,6 +281,30 @@ int sd_dhcp_client_get_router(sd_dhcp_client *client, struct in_addr *addr)
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return 0;
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}
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int sd_dhcp_client_get_netmask(sd_dhcp_client *client, struct in_addr *addr)
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{
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assert_return(client, -EINVAL);
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assert_return(addr, -EINVAL);
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switch (client->state) {
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case DHCP_STATE_INIT:
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case DHCP_STATE_SELECTING:
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case DHCP_STATE_INIT_REBOOT:
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case DHCP_STATE_REBOOTING:
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case DHCP_STATE_REQUESTING:
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return -EADDRNOTAVAIL;
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case DHCP_STATE_BOUND:
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case DHCP_STATE_RENEWING:
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case DHCP_STATE_REBINDING:
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addr->s_addr = client->lease->subnet_mask;
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break;
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}
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return 0;
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}
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static int client_notify(sd_dhcp_client *client, int event)
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{
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if (client->cb)
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@ -788,6 +816,19 @@ static int client_parse_offer(uint8_t code, uint8_t len, const uint8_t *option,
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break;
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case DHCP_OPTION_INTERFACE_MTU:
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if (len >= 2) {
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be16_t mtu;
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memcpy(&mtu, option, 2);
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lease->mtu = be16toh(mtu);
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if (lease->mtu < 68)
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lease->mtu = 0;
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}
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break;
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case DHCP_OPTION_RENEWAL_T1_TIME:
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if (len == 4) {
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memcpy(&val, option, 4);
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@ -31,5 +31,6 @@ Address.Label, config_parse_label, 0, 0
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Route.Gateway, config_parse_gateway, 0, 0
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Route.Destination, config_parse_destination, 0, 0
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DHCPv4.UseDNS, config_parse_bool, 0, offsetof(Network, dhcp_dns)
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DHCPv4.UseMTU, config_parse_bool, 0, offsetof(Network, dhcp_mtu)
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Bridge.Description, config_parse_string, 0, offsetof(Bridge, description)
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Bridge.Name, config_parse_ifname, 0, offsetof(Bridge, name)
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@ -310,6 +310,56 @@ static int address_drop_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdat
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return 1;
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}
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static int set_mtu_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
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Link *link = userdata;
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int r;
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assert(m);
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assert(link);
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assert(link->ifname);
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if (link->state == LINK_STATE_FAILED)
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return 1;
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r = sd_rtnl_message_get_errno(m);
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if (r < 0 && r != -EEXIST)
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log_warning_link(link, "Could not set MTU: %s", strerror(-r));
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return 1;
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}
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static int link_set_mtu(Link *link, uint32_t mtu) {
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_cleanup_sd_rtnl_message_unref_ sd_rtnl_message *req = NULL;
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int r;
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assert(link);
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assert(link->manager);
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assert(link->manager->rtnl);
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log_debug_link(link, "setting MTU: %" PRIu32, mtu);
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r = sd_rtnl_message_link_new(RTM_SETLINK, link->ifindex, &req);
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if (r < 0) {
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log_error_link(link, "Could not allocate RTM_SETLINK message");
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return r;
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}
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r = sd_rtnl_message_append_u32(req, IFLA_MTU, mtu);
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if (r < 0) {
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log_error_link(link, "Could not append MTU: %s", strerror(-r));
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return r;
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}
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r = sd_rtnl_call_async(link->manager->rtnl, req, set_mtu_handler, link, 0, NULL);
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if (r < 0) {
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log_error_link(link,
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"Could not send rtnetlink message: %s", strerror(-r));
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return r;
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}
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return 0;
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}
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static void dhcp_handler(sd_dhcp_client *client, int event, void *userdata) {
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Link *link = userdata;
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struct in_addr address;
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@ -346,6 +396,20 @@ static void dhcp_handler(sd_dhcp_client *client, int event, void *userdata) {
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route_free(link->dhcp_route);
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link->dhcp_route = NULL;
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}
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if (link->network->dhcp_mtu) {
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uint16_t mtu;
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r = sd_dhcp_client_get_mtu(client, &mtu);
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if (r >= 0 && link->original_mtu != mtu) {
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r = link_set_mtu(link, link->original_mtu);
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if (r < 0) {
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log_warning_link(link, "DHCP error: could not reset MTU");
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link_enter_failed(link);
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return;
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}
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}
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}
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}
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r = sd_dhcp_client_get_address(client, &address);
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@ -431,6 +495,18 @@ static void dhcp_handler(sd_dhcp_client *client, int event, void *userdata) {
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}
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}
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if (link->network->dhcp_mtu) {
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uint16_t mtu;
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r = sd_dhcp_client_get_mtu(client, &mtu);
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if (r >= 0) {
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r = link_set_mtu(link, mtu);
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if (r < 0)
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log_error_link(link, "Failed to set MTU "
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"to %" PRIu16, mtu);
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}
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}
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link_enter_set_addresses(link);
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}
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@ -466,6 +542,12 @@ static int link_acquire_conf(Link *link) {
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log_debug_link(link, "acquiring DHCPv4 lease");
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if (link->network->dhcp_mtu) {
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r = sd_dhcp_client_set_request_option(link->dhcp, 26);
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if (r < 0)
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return r;
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}
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r = sd_dhcp_client_start(link->dhcp);
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if (r < 0)
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return r;
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@ -727,6 +809,8 @@ int link_configure(Link *link) {
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int link_update(Link *link, sd_rtnl_message *m) {
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unsigned flags;
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void *data;
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uint16_t type;
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int r;
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assert(link);
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@ -737,9 +821,16 @@ int link_update(Link *link, sd_rtnl_message *m) {
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r = sd_rtnl_message_link_get_flags(m, &flags);
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if (r < 0) {
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log_warning_link(link, "could not get link flags");
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log_warning_link(link, "Could not get link flags");
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return r;
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}
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while (sd_rtnl_message_read(m, &type, &data) > 0) {
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if (type == IFLA_MTU && link->network->dhcp_mtu && !link->original_mtu) {
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link->original_mtu = *(uint16_t *) data;
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log_debug_link(link, "saved original MTU: %" PRIu16, link->original_mtu);
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}
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}
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return link_update_flags(link, flags);
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}
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@ -66,6 +66,7 @@ static int network_load_one(Manager *manager, const char *filename) {
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return log_oom();
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network->dhcp_dns = true;
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network->dhcp_mtu = true;
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r = config_parse(NULL, filename, file, "Match\0Network\0Address\0Route\0DHCPv4\0", config_item_perf_lookup,
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(void*) network_gperf_lookup, false, false, network);
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@ -86,6 +86,7 @@ struct Network {
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Bridge *bridge;
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bool dhcp;
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bool dhcp_dns;
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bool dhcp_mtu;
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LIST_HEAD(Address, static_addresses);
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LIST_HEAD(Route, static_routes);
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@ -160,6 +161,7 @@ struct Link {
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Route *dhcp_route;
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Address *dhcp_address;
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Address *dns;
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uint16_t original_mtu;
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LinkState state;
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@ -55,6 +55,7 @@ int sd_dhcp_client_get_netmask(sd_dhcp_client *client, struct in_addr *addr);
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int sd_dhcp_client_prefixlen(const struct in_addr *addr);
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int sd_dhcp_client_get_router(sd_dhcp_client *client, struct in_addr *addr);
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int sd_dhcp_client_get_dns(sd_dhcp_client *client, struct in_addr ***addr);
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int sd_dhcp_client_get_mtu(sd_dhcp_client *client, uint16_t *mtu);
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int sd_dhcp_client_stop(sd_dhcp_client *client);
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int sd_dhcp_client_start(sd_dhcp_client *client);
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