+++ /dev/null
-/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
-
-/***
- This file is part of systemd.
-
- Copyright 2013-2014 Tom Gundersen <teg@jklm.no>
-
- systemd is free software; you can redistribute it and/or modify it
- under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 2.1 of the License, or
- (at your option) any later version.
-
- systemd is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public License
- along with systemd; If not, see <http://www.gnu.org/licenses/>.
-***/
-
-#include <netinet/ether.h>
-#include <linux/if.h>
-
-#include "networkd-link.h"
-#include "network-internal.h"
-#include "dhcp-lease-internal.h"
-
-static int dhcp4_route_handler(sd_rtnl *rtnl, sd_rtnl_message *m,
- void *userdata) {
- _cleanup_link_unref_ Link *link = userdata;
- int r;
-
- assert(link);
- assert(link->dhcp4_messages);
-
- link->dhcp4_messages --;
-
- r = sd_rtnl_message_get_errno(m);
- if (r < 0 && r != -EEXIST) {
- log_link_error(link, "could not set DHCPv4 route: %s",
- strerror(-r));
- link_enter_failed(link);
- }
-
- if (!link->dhcp4_messages) {
- link->dhcp4_configured = true;
- link_client_handler(link);
- }
-
- return 1;
-}
-
-static int link_set_dhcp_routes(Link *link) {
- struct in_addr gateway;
- struct sd_dhcp_route *static_routes;
- int r, n, i;
-
- assert(link);
- assert(link->dhcp_lease);
-
- r = sd_dhcp_lease_get_router(link->dhcp_lease, &gateway);
- if (r < 0 && r != -ENOENT) {
- log_link_warning(link,
- "DHCP error: could not get gateway: %s",
- strerror(-r));
- return r;
- }
- if (r >= 0) {
- struct in_addr address;
- _cleanup_route_free_ Route *route = NULL;
- _cleanup_route_free_ Route *route_gw = NULL;
-
- r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
- if (r < 0) {
- log_link_warning(link,
- "DHCP error: could not get address: %s",
- strerror(-r));
- return r;
- }
-
- r = route_new_dynamic(&route, RTPROT_DHCP);
- if (r < 0) {
- log_link_error(link,
- "Could not allocate route: %s",
- strerror(-r));
- return r;
- }
-
- r = route_new_dynamic(&route_gw, RTPROT_DHCP);
- if (r < 0) {
- log_link_error(link,
- "Could not allocate route: %s",
- strerror(-r));
- return r;
- }
-
- /* The dhcp netmask may mask out the gateway. Add an explicit
- * route for the gw host so that we can route no matter the
- * netmask or existing kernel route tables. */
- route_gw->family = AF_INET;
- route_gw->dst_addr.in = gateway;
- route_gw->dst_prefixlen = 32;
- route_gw->prefsrc_addr.in = address;
- route_gw->scope = RT_SCOPE_LINK;
- route_gw->metrics = link->network->dhcp_route_metric;
-
- r = route_configure(route_gw, link, &dhcp4_route_handler);
- if (r < 0) {
- log_link_warning(link,
- "could not set host route: %s",
- strerror(-r));
- return r;
- }
-
- link->dhcp4_messages ++;
-
- route->family = AF_INET;
- route->in_addr.in = gateway;
- route->prefsrc_addr.in = address;
- route->metrics = link->network->dhcp_route_metric;
-
- r = route_configure(route, link, &dhcp4_route_handler);
- if (r < 0) {
- log_link_warning(link,
- "could not set routes: %s",
- strerror(-r));
- link_enter_failed(link);
- return r;
- }
-
- link->dhcp4_messages ++;
- }
-
- n = sd_dhcp_lease_get_routes(link->dhcp_lease, &static_routes);
- if (n == -ENOENT)
- return 0;
- if (n < 0) {
- log_link_warning(link,
- "DHCP error: could not get routes: %s",
- strerror(-n));
-
- return n;
- }
-
- for (i = 0; i < n; i++) {
- _cleanup_route_free_ Route *route = NULL;
-
- r = route_new_dynamic(&route, RTPROT_DHCP);
- if (r < 0) {
- log_link_error(link, "Could not allocate route: %s",
- strerror(-r));
- return r;
- }
-
- route->family = AF_INET;
- route->in_addr.in = static_routes[i].gw_addr;
- route->dst_addr.in = static_routes[i].dst_addr;
- route->dst_prefixlen = static_routes[i].dst_prefixlen;
- route->metrics = link->network->dhcp_route_metric;
-
- r = route_configure(route, link, &dhcp4_route_handler);
- if (r < 0) {
- log_link_warning(link,
- "could not set host route: %s",
- strerror(-r));
- return r;
- }
-
- link->dhcp4_messages ++;
- }
-
- return 0;
-}
-
-static int dhcp_lease_lost(Link *link) {
- _cleanup_address_free_ Address *address = NULL;
- struct in_addr addr;
- struct in_addr netmask;
- struct in_addr gateway;
- unsigned prefixlen = 0;
- int r;
-
- assert(link);
- assert(link->dhcp_lease);
-
- log_link_warning(link, "DHCP lease lost");
-
- if (link->network->dhcp_routes) {
- struct sd_dhcp_route *routes;
- int n, i;
-
- n = sd_dhcp_lease_get_routes(link->dhcp_lease, &routes);
- if (n >= 0) {
- for (i = 0; i < n; i++) {
- _cleanup_route_free_ Route *route = NULL;
-
- r = route_new_dynamic(&route, RTPROT_UNSPEC);
- if (r >= 0) {
- route->family = AF_INET;
- route->in_addr.in = routes[i].gw_addr;
- route->dst_addr.in = routes[i].dst_addr;
- route->dst_prefixlen = routes[i].dst_prefixlen;
-
- route_drop(route, link,
- &link_route_drop_handler);
- }
- }
- }
- }
-
- r = address_new_dynamic(&address);
- if (r >= 0) {
- r = sd_dhcp_lease_get_router(link->dhcp_lease, &gateway);
- if (r >= 0) {
- _cleanup_route_free_ Route *route_gw = NULL;
- _cleanup_route_free_ Route *route = NULL;
-
- r = route_new_dynamic(&route_gw, RTPROT_UNSPEC);
- if (r >= 0) {
- route_gw->family = AF_INET;
- route_gw->dst_addr.in = gateway;
- route_gw->dst_prefixlen = 32;
- route_gw->scope = RT_SCOPE_LINK;
-
- route_drop(route_gw, link,
- &link_route_drop_handler);
- }
-
- r = route_new_dynamic(&route, RTPROT_UNSPEC);
- if (r >= 0) {
- route->family = AF_INET;
- route->in_addr.in = gateway;
-
- route_drop(route, link,
- &link_route_drop_handler);
- }
- }
-
- r = sd_dhcp_lease_get_address(link->dhcp_lease, &addr);
- if (r >= 0) {
- r = sd_dhcp_lease_get_netmask(link->dhcp_lease, &netmask);
- if (r >= 0)
- prefixlen = in_addr_netmask_to_prefixlen(&netmask);
-
- address->family = AF_INET;
- address->in_addr.in = addr;
- address->prefixlen = prefixlen;
-
- address_drop(address, link, &link_address_drop_handler);
- }
- }
-
- if (link->network->dhcp_mtu) {
- uint16_t mtu;
-
- r = sd_dhcp_lease_get_mtu(link->dhcp_lease, &mtu);
- if (r >= 0 && link->original_mtu != mtu) {
- r = link_set_mtu(link, link->original_mtu);
- if (r < 0) {
- log_link_warning(link,
- "DHCP error: could not reset MTU");
- link_enter_failed(link);
- return r;
- }
- }
- }
-
- if (link->network->dhcp_hostname) {
- const char *hostname = NULL;
-
- r = sd_dhcp_lease_get_hostname(link->dhcp_lease, &hostname);
- if (r >= 0 && hostname) {
- r = link_set_hostname(link, "");
- if (r < 0)
- log_link_error(link,
- "Failed to reset transient hostname");
- }
- }
-
- link->dhcp_lease = sd_dhcp_lease_unref(link->dhcp_lease);
- link->dhcp4_configured = false;
-
- return 0;
-}
-
-static int dhcp4_address_handler(sd_rtnl *rtnl, sd_rtnl_message *m,
- void *userdata) {
- _cleanup_link_unref_ Link *link = userdata;
- int r;
-
- assert(link);
-
- r = sd_rtnl_message_get_errno(m);
- if (r < 0 && r != -EEXIST) {
- log_link_error(link, "could not set DHCPv4 address: %s",
- strerror(-r));
- link_enter_failed(link);
- } else if (r >= 0)
- link_rtnl_process_address(rtnl, m, link->manager);
-
- link_set_dhcp_routes(link);
-
- return 1;
-}
-
-static int dhcp4_update_address(Link *link,
- struct in_addr *address,
- struct in_addr *netmask,
- uint32_t lifetime) {
- _cleanup_address_free_ Address *addr = NULL;
- unsigned prefixlen;
- int r;
-
- assert(address);
- assert(netmask);
- assert(lifetime);
-
- prefixlen = in_addr_netmask_to_prefixlen(netmask);
-
- r = address_new_dynamic(&addr);
- if (r < 0)
- return r;
-
- addr->family = AF_INET;
- addr->in_addr.in.s_addr = address->s_addr;
- addr->cinfo.ifa_prefered = lifetime;
- addr->cinfo.ifa_valid = lifetime;
- addr->prefixlen = prefixlen;
- addr->broadcast.s_addr = address->s_addr | ~netmask->s_addr;
-
- /* use update rather than configure so that we will update the
- * lifetime of an existing address if it has already been configured */
- r = address_update(addr, link, &dhcp4_address_handler);
- if (r < 0)
- return r;
-
- return 0;
-}
-
-static int dhcp_lease_renew(sd_dhcp_client *client, Link *link) {
- sd_dhcp_lease *lease;
- struct in_addr address;
- struct in_addr netmask;
- uint32_t lifetime = CACHE_INFO_INFINITY_LIFE_TIME;
- int r;
-
- assert(link);
- assert(client);
- assert(link->network);
-
- r = sd_dhcp_client_get_lease(client, &lease);
- if (r < 0) {
- log_link_warning(link, "DHCP error: no lease %s",
- strerror(-r));
- return r;
- }
-
- sd_dhcp_lease_unref(link->dhcp_lease);
- link->dhcp4_configured = false;
- link->dhcp_lease = lease;
-
- r = sd_dhcp_lease_get_address(lease, &address);
- if (r < 0) {
- log_link_warning(link, "DHCP error: no address: %s",
- strerror(-r));
- return r;
- }
-
- r = sd_dhcp_lease_get_netmask(lease, &netmask);
- if (r < 0) {
- log_link_warning(link, "DHCP error: no netmask: %s",
- strerror(-r));
- return r;
- }
-
- if (!link->network->dhcp_critical) {
- r = sd_dhcp_lease_get_lifetime(link->dhcp_lease,
- &lifetime);
- if (r < 0) {
- log_link_warning(link,
- "DHCP error: no lifetime: %s",
- strerror(-r));
- return r;
- }
- }
-
- r = dhcp4_update_address(link, &address, &netmask, lifetime);
- if (r < 0) {
- log_link_warning(link, "could not update IP address: %s",
- strerror(-r));
- link_enter_failed(link);
- return r;
- }
-
- return 0;
-}
-
-static int dhcp_lease_acquired(sd_dhcp_client *client, Link *link) {
- sd_dhcp_lease *lease;
- struct in_addr address;
- struct in_addr netmask;
- struct in_addr gateway;
- unsigned prefixlen;
- uint32_t lifetime = CACHE_INFO_INFINITY_LIFE_TIME;
- int r;
-
- assert(client);
- assert(link);
-
- r = sd_dhcp_client_get_lease(client, &lease);
- if (r < 0) {
- log_link_warning(link, "DHCP error: no lease: %s",
- strerror(-r));
- return r;
- }
-
- r = sd_dhcp_lease_get_address(lease, &address);
- if (r < 0) {
- log_link_warning(link, "DHCP error: no address: %s",
- strerror(-r));
- return r;
- }
-
- r = sd_dhcp_lease_get_netmask(lease, &netmask);
- if (r < 0) {
- log_link_warning(link, "DHCP error: no netmask: %s",
- strerror(-r));
- return r;
- }
-
- prefixlen = in_addr_netmask_to_prefixlen(&netmask);
-
- r = sd_dhcp_lease_get_router(lease, &gateway);
- if (r < 0 && r != -ENOENT) {
- log_link_warning(link, "DHCP error: could not get gateway: %s",
- strerror(-r));
- return r;
- }
-
- if (r >= 0)
- log_link_struct(link, LOG_INFO,
- "MESSAGE=%-*s: DHCPv4 address %u.%u.%u.%u/%u via %u.%u.%u.%u",
- IFNAMSIZ,
- link->ifname,
- ADDRESS_FMT_VAL(address),
- prefixlen,
- ADDRESS_FMT_VAL(gateway),
- "ADDRESS=%u.%u.%u.%u",
- ADDRESS_FMT_VAL(address),
- "PREFIXLEN=%u",
- prefixlen,
- "GATEWAY=%u.%u.%u.%u",
- ADDRESS_FMT_VAL(gateway),
- NULL);
- else
- log_link_struct(link, LOG_INFO,
- "MESSAGE=%-*s: DHCPv4 address %u.%u.%u.%u/%u",
- IFNAMSIZ,
- link->ifname,
- ADDRESS_FMT_VAL(address),
- prefixlen,
- "ADDRESS=%u.%u.%u.%u",
- ADDRESS_FMT_VAL(address),
- "PREFIXLEN=%u",
- prefixlen,
- NULL);
-
- link->dhcp_lease = lease;
-
- if (link->network->dhcp_mtu) {
- uint16_t mtu;
-
- r = sd_dhcp_lease_get_mtu(lease, &mtu);
- if (r >= 0) {
- r = link_set_mtu(link, mtu);
- if (r < 0)
- log_link_error(link, "Failed to set MTU "
- "to %" PRIu16, mtu);
- }
- }
-
- if (link->network->dhcp_hostname) {
- const char *hostname;
-
- r = sd_dhcp_lease_get_hostname(lease, &hostname);
- if (r >= 0) {
- r = link_set_hostname(link, hostname);
- if (r < 0)
- log_link_error(link,
- "Failed to set transient hostname to '%s'",
- hostname);
- }
- }
-
- if (!link->network->dhcp_critical) {
- r = sd_dhcp_lease_get_lifetime(link->dhcp_lease,
- &lifetime);
- if (r < 0) {
- log_link_warning(link,
- "DHCP error: no lifetime: %s",
- strerror(-r));
- return r;
- }
- }
-
- r = dhcp4_update_address(link, &address, &netmask, lifetime);
- if (r < 0) {
- log_link_warning(link, "could not update IP address: %s",
- strerror(-r));
- link_enter_failed(link);
- return r;
- }
-
- return 0;
-}
-static void dhcp4_handler(sd_dhcp_client *client, int event, void *userdata) {
- Link *link = userdata;
- int r = 0;
-
- assert(link);
- assert(link->network);
- assert(link->manager);
-
- if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
- return;
-
- switch (event) {
- case DHCP_EVENT_EXPIRED:
- case DHCP_EVENT_STOP:
- case DHCP_EVENT_IP_CHANGE:
- if (link->network->dhcp_critical) {
- log_link_error(link,
- "DHCPv4 connection considered system critical, ignoring request to reconfigure it.");
- return;
- }
-
- if (link->dhcp_lease) {
- r = dhcp_lease_lost(link);
- if (r < 0) {
- link_enter_failed(link);
- return;
- }
- }
-
- if (event == DHCP_EVENT_IP_CHANGE) {
- r = dhcp_lease_acquired(client, link);
- if (r < 0) {
- link_enter_failed(link);
- return;
- }
- }
-
- break;
- case DHCP_EVENT_RENEW:
- r = dhcp_lease_renew(client, link);
- if (r < 0) {
- link_enter_failed(link);
- return;
- }
- break;
- case DHCP_EVENT_IP_ACQUIRE:
- r = dhcp_lease_acquired(client, link);
- if (r < 0) {
- link_enter_failed(link);
- return;
- }
- break;
- default:
- if (event < 0)
- log_link_warning(link,
- "DHCP error: client failed: %s",
- strerror(-event));
- else
- log_link_warning(link,
- "DHCP unknown event: %d",
- event);
- break;
- }
-
- return;
-}
-
-int dhcp4_configure(Link *link) {
- int r;
-
- assert(link);
- assert(link->network);
- assert(IN_SET(link->network->dhcp, ADDRESS_FAMILY_YES, ADDRESS_FAMILY_IPV4));
-
- r = sd_dhcp_client_new(&link->dhcp_client);
- if (r < 0)
- return r;
-
- r = sd_dhcp_client_attach_event(link->dhcp_client, NULL, 0);
- if (r < 0)
- return r;
-
- r = sd_dhcp_client_set_mac(link->dhcp_client,
- (const uint8_t *) &link->mac,
- sizeof (link->mac), ARPHRD_ETHER);
- if (r < 0)
- return r;
-
- r = sd_dhcp_client_set_index(link->dhcp_client, link->ifindex);
- if (r < 0)
- return r;
-
- r = sd_dhcp_client_set_callback(link->dhcp_client, dhcp4_handler, link);
- if (r < 0)
- return r;
-
- r = sd_dhcp_client_set_request_broadcast(link->dhcp_client,
- link->network->dhcp_broadcast);
- 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)
- return r;
- }
-
- if (link->network->dhcp_routes) {
- r = sd_dhcp_client_set_request_option(link->dhcp_client,
- DHCP_OPTION_STATIC_ROUTE);
- if (r < 0)
- return r;
- r = sd_dhcp_client_set_request_option(link->dhcp_client,
- DHCP_OPTION_CLASSLESS_STATIC_ROUTE);
- if (r < 0)
- return r;
- }
-
- if (link->network->dhcp_sendhost) {
- _cleanup_free_ char *hostname = NULL;
-
- hostname = gethostname_malloc();
- if (!hostname)
- return -ENOMEM;
-
- if (!is_localhost(hostname)) {
- r = sd_dhcp_client_set_hostname(link->dhcp_client,
- hostname);
- if (r < 0)
- return r;
- }
- }
-
- if (link->network->dhcp_vendor_class_identifier) {
- r = sd_dhcp_client_set_vendor_class_identifier(link->dhcp_client,
- link->network->dhcp_vendor_class_identifier);
- if (r < 0)
- return r;
- }
-
- switch (link->network->dhcp_client_identifier) {
- case DHCP_CLIENT_ID_DUID:
- /* Library defaults to this. */
- break;
- case DHCP_CLIENT_ID_MAC:
- r = sd_dhcp_client_set_client_id(link->dhcp_client,
- ARPHRD_ETHER,
- (const uint8_t *) &link->mac,
- sizeof (link->mac));
- if (r < 0)
- return r;
- break;
- default:
- assert_not_reached("Unknown client identifier type.");
- }
-
- return 0;
-}
~ianmdlvl / elogind.git / blobdiff