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-rw-r--r--src/network/networkd-ipv4ll.c227
1 files changed, 227 insertions, 0 deletions
diff --git a/src/network/networkd-ipv4ll.c b/src/network/networkd-ipv4ll.c
new file mode 100644
index 0000000..3562e90
--- /dev/null
+++ b/src/network/networkd-ipv4ll.c
@@ -0,0 +1,227 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+
+#include <netinet/ether.h>
+#include <linux/if.h>
+
+#include "network-internal.h"
+#include "networkd-address.h"
+#include "networkd-manager.h"
+#include "networkd-link.h"
+
+static int ipv4ll_address_lost(Link *link) {
+ _cleanup_(address_freep) Address *address = NULL;
+ _cleanup_(route_freep) Route *route = NULL;
+ struct in_addr addr;
+ int r;
+
+ assert(link);
+
+ link->ipv4ll_route = false;
+ link->ipv4ll_address = false;
+
+ r = sd_ipv4ll_get_address(link->ipv4ll, &addr);
+ if (r < 0)
+ return 0;
+
+ log_link_debug(link, "IPv4 link-local release %u.%u.%u.%u", ADDRESS_FMT_VAL(addr));
+
+ r = address_new(&address);
+ if (r < 0)
+ return log_link_error_errno(link, r, "Could not allocate address: %m");
+
+ address->family = AF_INET;
+ address->in_addr.in = addr;
+ address->prefixlen = 16;
+ address->scope = RT_SCOPE_LINK;
+
+ address_remove(address, link, NULL);
+
+ r = route_new(&route);
+ if (r < 0)
+ return log_link_error_errno(link, r, "Could not allocate route: %m");
+
+ route->family = AF_INET;
+ route->scope = RT_SCOPE_LINK;
+ route->priority = IPV4LL_ROUTE_METRIC;
+
+ route_remove(route, link, NULL);
+
+ link_check_ready(link);
+
+ return 0;
+}
+
+static int ipv4ll_route_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
+ int r;
+
+ assert(link);
+ assert(!link->ipv4ll_route);
+
+ r = sd_netlink_message_get_errno(m);
+ if (r < 0 && r != -EEXIST) {
+ log_link_error_errno(link, r, "could not set ipv4ll route: %m");
+ link_enter_failed(link);
+ }
+
+ link->ipv4ll_route = true;
+
+ if (link->ipv4ll_address == true)
+ link_check_ready(link);
+
+ return 1;
+}
+
+static int ipv4ll_address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
+ int r;
+
+ assert(link);
+ assert(!link->ipv4ll_address);
+
+ r = sd_netlink_message_get_errno(m);
+ if (r < 0 && r != -EEXIST) {
+ log_link_error_errno(link, r, "could not set ipv4ll address: %m");
+ link_enter_failed(link);
+ } else if (r >= 0)
+ manager_rtnl_process_address(rtnl, m, link->manager);
+
+ link->ipv4ll_address = true;
+
+ if (link->ipv4ll_route)
+ link_check_ready(link);
+
+ return 1;
+}
+
+static int ipv4ll_address_claimed(sd_ipv4ll *ll, Link *link) {
+ _cleanup_(address_freep) Address *ll_addr = NULL;
+ _cleanup_(route_freep) Route *route = NULL;
+ struct in_addr address;
+ int r;
+
+ assert(ll);
+ assert(link);
+
+ r = sd_ipv4ll_get_address(ll, &address);
+ if (r == -ENOENT)
+ return 0;
+ else if (r < 0)
+ return r;
+
+ log_link_debug(link, "IPv4 link-local claim %u.%u.%u.%u",
+ ADDRESS_FMT_VAL(address));
+
+ r = address_new(&ll_addr);
+ if (r < 0)
+ return r;
+
+ ll_addr->family = AF_INET;
+ ll_addr->in_addr.in = address;
+ ll_addr->prefixlen = 16;
+ ll_addr->broadcast.s_addr = ll_addr->in_addr.in.s_addr | htobe32(0xfffffffflu >> ll_addr->prefixlen);
+ ll_addr->scope = RT_SCOPE_LINK;
+
+ r = address_configure(ll_addr, link, ipv4ll_address_handler, false);
+ if (r < 0)
+ return r;
+
+ link->ipv4ll_address = false;
+
+ r = route_new(&route);
+ if (r < 0)
+ return r;
+
+ route->family = AF_INET;
+ route->scope = RT_SCOPE_LINK;
+ route->protocol = RTPROT_STATIC;
+ route->priority = IPV4LL_ROUTE_METRIC;
+
+ r = route_configure(route, link, ipv4ll_route_handler);
+ if (r < 0)
+ return r;
+
+ link->ipv4ll_route = false;
+
+ return 0;
+}
+
+static void ipv4ll_handler(sd_ipv4ll *ll, int event, void *userdata) {
+ Link *link = userdata;
+ int r;
+
+ assert(link);
+ assert(link->network);
+
+ if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
+ return;
+
+ switch(event) {
+ case SD_IPV4LL_EVENT_STOP:
+ r = ipv4ll_address_lost(link);
+ if (r < 0) {
+ link_enter_failed(link);
+ return;
+ }
+ break;
+ case SD_IPV4LL_EVENT_CONFLICT:
+ r = ipv4ll_address_lost(link);
+ if (r < 0) {
+ link_enter_failed(link);
+ return;
+ }
+
+ r = sd_ipv4ll_restart(ll);
+ if (r < 0)
+ log_link_warning(link, "Could not acquire IPv4 link-local address");
+ break;
+ case SD_IPV4LL_EVENT_BIND:
+ r = ipv4ll_address_claimed(ll, link);
+ if (r < 0) {
+ link_enter_failed(link);
+ return;
+ }
+ break;
+ default:
+ log_link_warning(link, "IPv4 link-local unknown event: %d", event);
+ break;
+ }
+}
+
+int ipv4ll_configure(Link *link) {
+ uint64_t seed;
+ int r;
+
+ assert(link);
+ assert(link->network);
+ assert(link->network->link_local & ADDRESS_FAMILY_IPV4);
+
+ if (!link->ipv4ll) {
+ r = sd_ipv4ll_new(&link->ipv4ll);
+ if (r < 0)
+ return r;
+ }
+
+ if (link->sd_device &&
+ net_get_unique_predictable_data(link->sd_device, &seed) >= 0) {
+ r = sd_ipv4ll_set_address_seed(link->ipv4ll, seed);
+ if (r < 0)
+ return r;
+ }
+
+ r = sd_ipv4ll_attach_event(link->ipv4ll, NULL, 0);
+ if (r < 0)
+ return r;
+
+ r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
+ if (r < 0)
+ return r;
+
+ r = sd_ipv4ll_set_ifindex(link->ipv4ll, link->ifindex);
+ if (r < 0)
+ return r;
+
+ r = sd_ipv4ll_set_callback(link->ipv4ll, ipv4ll_handler, link);
+ if (r < 0)
+ return r;
+
+ return 0;
+}