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-rw-r--r--src/network/networkd-ipv4ll.c319
1 files changed, 319 insertions, 0 deletions
diff --git a/src/network/networkd-ipv4ll.c b/src/network/networkd-ipv4ll.c
new file mode 100644
index 0000000..c357382
--- /dev/null
+++ b/src/network/networkd-ipv4ll.c
@@ -0,0 +1,319 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <netinet/in.h>
+#include <linux/if.h>
+
+#include "netif-util.h"
+#include "networkd-address.h"
+#include "networkd-ipv4acd.h"
+#include "networkd-ipv4ll.h"
+#include "networkd-link.h"
+#include "networkd-manager.h"
+#include "networkd-queue.h"
+#include "parse-util.h"
+
+bool link_ipv4ll_enabled(Link *link) {
+ assert(link);
+
+ if (!link_ipv4acd_supported(link))
+ return false;
+
+ if (!link->network)
+ return false;
+
+ if (link->network->bond)
+ return false;
+
+ return link->network->link_local & ADDRESS_FAMILY_IPV4;
+}
+
+static int address_new_from_ipv4ll(Link *link, Address **ret) {
+ _cleanup_(address_freep) Address *address = NULL;
+ struct in_addr addr;
+ int r;
+
+ assert(link);
+ assert(link->ipv4ll);
+ assert(ret);
+
+ r = sd_ipv4ll_get_address(link->ipv4ll, &addr);
+ if (r < 0)
+ return r;
+
+ r = address_new(&address);
+ if (r < 0)
+ return -ENOMEM;
+
+ address->source = NETWORK_CONFIG_SOURCE_IPV4LL;
+ address->family = AF_INET;
+ address->in_addr.in = addr;
+ address->prefixlen = 16;
+ address->scope = RT_SCOPE_LINK;
+ address->route_metric = IPV4LL_ROUTE_METRIC;
+
+ *ret = TAKE_PTR(address);
+ return 0;
+}
+
+static int ipv4ll_address_lost(Link *link) {
+ _cleanup_(address_freep) Address *address = NULL;
+ Address *existing;
+ int r;
+
+ assert(link);
+
+ link->ipv4ll_address_configured = false;
+
+ r = address_new_from_ipv4ll(link, &address);
+ if (r == -ENOENT)
+ return 0;
+ if (r < 0)
+ return r;
+
+ if (address_get(link, address, &existing) < 0)
+ return 0;
+
+ if (existing->source != NETWORK_CONFIG_SOURCE_IPV4LL)
+ return 0;
+
+ if (!address_exists(existing))
+ return 0;
+
+ log_link_debug(link, "IPv4 link-local release "IPV4_ADDRESS_FMT_STR,
+ IPV4_ADDRESS_FMT_VAL(address->in_addr.in));
+
+ return address_remove(existing);
+}
+
+static int ipv4ll_address_handler(sd_netlink *rtnl, sd_netlink_message *m, Request *req, Link *link, Address *address) {
+ int r;
+
+ assert(link);
+ assert(!link->ipv4ll_address_configured);
+
+ r = address_configure_handler_internal(rtnl, m, link, "Could not set ipv4ll address");
+ if (r <= 0)
+ return r;
+
+ link->ipv4ll_address_configured = true;
+ link_check_ready(link);
+
+ return 1;
+}
+
+static int ipv4ll_address_claimed(sd_ipv4ll *ll, Link *link) {
+ _cleanup_(address_freep) Address *address = NULL;
+ int r;
+
+ assert(ll);
+ assert(link);
+
+ link->ipv4ll_address_configured = false;
+
+ r = address_new_from_ipv4ll(link, &address);
+ if (r == -ENOENT)
+ return 0;
+ if (r < 0)
+ return r;
+
+ log_link_debug(link, "IPv4 link-local claim "IPV4_ADDRESS_FMT_STR,
+ IPV4_ADDRESS_FMT_VAL(address->in_addr.in));
+
+ return link_request_address(link, address, NULL, ipv4ll_address_handler, NULL);
+}
+
+static void ipv4ll_handler(sd_ipv4ll *ll, int event, void *userdata) {
+ Link *link = ASSERT_PTR(userdata);
+ int r;
+
+ 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_errno(link, r, "Could not acquire IPv4 link-local address: %m");
+ link_enter_failed(link);
+ }
+ break;
+ case SD_IPV4LL_EVENT_BIND:
+ r = ipv4ll_address_claimed(ll, link);
+ if (r < 0) {
+ log_link_error(link, "Failed to configure ipv4ll address: %m");
+ link_enter_failed(link);
+ return;
+ }
+ break;
+ default:
+ log_link_warning(link, "IPv4 link-local unknown event: %d", event);
+ break;
+ }
+}
+
+static int ipv4ll_check_mac(sd_ipv4ll *ll, const struct ether_addr *mac, void *userdata) {
+ Manager *m = ASSERT_PTR(userdata);
+ struct hw_addr_data hw_addr;
+
+ assert(mac);
+
+ hw_addr = (struct hw_addr_data) {
+ .length = ETH_ALEN,
+ .ether = *mac,
+ };
+
+ return link_get_by_hw_addr(m, &hw_addr, NULL) >= 0;
+}
+
+int ipv4ll_configure(Link *link) {
+ uint64_t seed;
+ int r;
+
+ assert(link);
+
+ if (!link_ipv4ll_enabled(link))
+ return 0;
+
+ if (link->ipv4ll)
+ return -EBUSY;
+
+ r = sd_ipv4ll_new(&link->ipv4ll);
+ if (r < 0)
+ return r;
+
+ r = sd_ipv4ll_attach_event(link->ipv4ll, link->manager->event, 0);
+ if (r < 0)
+ return r;
+
+ if (link->dev &&
+ net_get_unique_predictable_data(link->dev, true, &seed) >= 0) {
+ r = sd_ipv4ll_set_address_seed(link->ipv4ll, seed);
+ if (r < 0)
+ return r;
+ }
+
+ r = sd_ipv4ll_set_mac(link->ipv4ll, &link->hw_addr.ether);
+ 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 sd_ipv4ll_set_check_mac_callback(link->ipv4ll, ipv4ll_check_mac, link->manager);
+}
+
+int ipv4ll_update_mac(Link *link) {
+ assert(link);
+
+ if (link->hw_addr.length != ETH_ALEN)
+ return 0;
+ if (ether_addr_is_null(&link->hw_addr.ether))
+ return 0;
+ if (!link->ipv4ll)
+ return 0;
+
+ return sd_ipv4ll_set_mac(link->ipv4ll, &link->hw_addr.ether);
+}
+
+int config_parse_ipv4ll(
+ const char* unit,
+ const char *filename,
+ unsigned line,
+ const char *section,
+ unsigned section_line,
+ const char *lvalue,
+ int ltype,
+ const char *rvalue,
+ void *data,
+ void *userdata) {
+
+ AddressFamily *link_local = ASSERT_PTR(data);
+ int r;
+
+ assert(filename);
+ assert(lvalue);
+ assert(rvalue);
+
+ /* Note that this is mostly like
+ * config_parse_address_family(), except that it
+ * applies only to IPv4 */
+
+ r = parse_boolean(rvalue);
+ if (r < 0) {
+ log_syntax(unit, LOG_WARNING, filename, line, r,
+ "Failed to parse %s=%s, ignoring assignment. "
+ "Note that the setting %s= is deprecated, please use LinkLocalAddressing= instead.",
+ lvalue, rvalue, lvalue);
+ return 0;
+ }
+
+ SET_FLAG(*link_local, ADDRESS_FAMILY_IPV4, r);
+
+ log_syntax(unit, LOG_WARNING, filename, line, 0,
+ "%s=%s is deprecated, please use LinkLocalAddressing=%s instead.",
+ lvalue, rvalue, address_family_to_string(*link_local));
+
+ return 0;
+}
+
+int config_parse_ipv4ll_address(
+ const char* unit,
+ const char *filename,
+ unsigned line,
+ const char *section,
+ unsigned section_line,
+ const char *lvalue,
+ int ltype,
+ const char *rvalue,
+ void *data,
+ void *userdata) {
+
+ union in_addr_union a;
+ struct in_addr *ipv4ll_address = ASSERT_PTR(data);
+ int r;
+
+ assert(filename);
+ assert(lvalue);
+ assert(rvalue);
+
+ if (isempty(rvalue)) {
+ *ipv4ll_address = (struct in_addr) {};
+ return 0;
+ }
+
+ r = in_addr_from_string(AF_INET, rvalue, &a);
+ if (r < 0) {
+ log_syntax(unit, LOG_WARNING, filename, line, r,
+ "Failed to parse %s=, ignoring assignment: %s", lvalue, rvalue);
+ return 0;
+ }
+ if (!in4_addr_is_link_local_dynamic(&a.in)) {
+ log_syntax(unit, LOG_WARNING, filename, line, 0,
+ "Specified address cannot be used as an IPv4 link local address, ignoring assignment: %s",
+ rvalue);
+ return 0;
+ }
+
+ *ipv4ll_address = a.in;
+ return 0;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-20 01:00:50 +0000