Adding upstream version 252.22.upstream/252.22upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 320 insertions, 0 deletions

diff --git a/src/network/networkd-ipv4ll.c b/src/network/networkd-ipv4ll.c
new file mode 100644
index 0000000..8450b34
--- /dev/null
+++ b/src/network/networkd-ipv4ll.c
@@ -0,0 +1,320 @@
+/* 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;
+        address_set_broadcast(address, link);
+
+        *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, TAKE_PTR(address), true, 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;
+}