Adding upstream version 252.22.upstream/252.22upstream

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

1 files changed, 327 insertions, 0 deletions

diff --git a/src/network/networkd-ipv4acd.c b/src/network/networkd-ipv4acd.c
new file mode 100644
index 0000000..877dee0
--- /dev/null
+++ b/src/network/networkd-ipv4acd.c
@@ -0,0 +1,327 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <net/if.h> /* IFF_LOOPBACK */
+#include <net/if_arp.h> /* ARPHRD_ETHER */
+
+#include "sd-dhcp-client.h"
+#include "sd-ipv4acd.h"
+
+#include "ipvlan.h"
+#include "networkd-address.h"
+#include "networkd-dhcp4.h"
+#include "networkd-ipv4acd.h"
+#include "networkd-link.h"
+#include "networkd-manager.h"
+
+bool link_ipv4acd_supported(Link *link) {
+        assert(link);
+
+        if (link->flags & IFF_LOOPBACK)
+                return false;
+
+        /* ARPHRD_INFINIBAND seems to potentially support IPv4ACD.
+         * But currently sd-ipv4acd only supports ARPHRD_ETHER. */
+        if (link->iftype != ARPHRD_ETHER)
+                return false;
+
+        if (link->hw_addr.length != ETH_ALEN)
+                return false;
+
+        if (ether_addr_is_null(&link->hw_addr.ether))
+                return false;
+
+        if (streq_ptr(link->kind, "vrf"))
+                return false;
+
+        /* L3 or L3S mode do not support ARP. */
+        if (IN_SET(link_get_ipvlan_mode(link), NETDEV_IPVLAN_MODE_L3, NETDEV_IPVLAN_MODE_L3S))
+                return false;
+
+        return true;
+}
+
+static bool address_ipv4acd_enabled(Address *address) {
+        assert(address);
+        assert(address->link);
+
+        if (address->family != AF_INET)
+                return false;
+
+        if (!FLAGS_SET(address->duplicate_address_detection, ADDRESS_FAMILY_IPV4))
+                return false;
+
+        /* Currently, only static and DHCP4 addresses are supported. */
+        if (!IN_SET(address->source, NETWORK_CONFIG_SOURCE_STATIC, NETWORK_CONFIG_SOURCE_DHCP4))
+                return false;
+
+        if (!link_ipv4acd_supported(address->link))
+                return false;
+
+        return true;
+}
+
+bool ipv4acd_bound(const Address *address) {
+        assert(address);
+
+        if (!address->acd)
+                return true;
+
+        return address->acd_bound;
+}
+
+static int static_ipv4acd_address_remove(Link *link, Address *address, bool on_conflict) {
+        int r;
+
+        assert(link);
+        assert(address);
+
+        if (!address_exists(address))
+                return 0; /* Not assigned. */
+
+        if (on_conflict)
+                log_link_warning(link, "Dropping address "IPV4_ADDRESS_FMT_STR", as an address conflict was detected.",
+                                 IPV4_ADDRESS_FMT_VAL(address->in_addr.in));
+        else
+                log_link_debug(link, "Removing address "IPV4_ADDRESS_FMT_STR", as the ACD client is stopped.",
+                               IPV4_ADDRESS_FMT_VAL(address->in_addr.in));
+
+        r = address_remove(address);
+        if (r < 0)
+                return log_link_warning_errno(link, r, "Failed to remove address "IPV4_ADDRESS_FMT_STR": %m",
+                                              IPV4_ADDRESS_FMT_VAL(address->in_addr.in));
+
+        return 0;
+}
+
+static int dhcp4_address_on_conflict(Link *link, Address *address) {
+        int r;
+
+        assert(link);
+        assert(link->dhcp_client);
+
+        r = sd_dhcp_client_send_decline(link->dhcp_client);
+        if (r < 0)
+                log_link_warning_errno(link, r, "Failed to send DHCP DECLINE, ignoring: %m");
+
+        if (!link->dhcp_lease)
+                /* Unlikely, but during probing the address, the lease may be lost. */
+                return 0;
+
+        log_link_warning(link, "Dropping DHCPv4 lease, as an address conflict was detected.");
+        r = dhcp4_lease_lost(link);
+        if (r < 0)
+                return log_link_warning_errno(link, r, "Failed to drop DHCPv4 lease: %m");
+
+        /* It is not necessary to call address_remove() here, as dhcp4_lease_lost() removes it. */
+        return 0;
+}
+
+static void on_acd(sd_ipv4acd *acd, int event, void *userdata) {
+        Address *address = ASSERT_PTR(userdata);
+        Link *link;
+        int r;
+
+        assert(acd);
+        assert(address->acd == acd);
+        assert(address->link);
+        assert(address->family == AF_INET);
+        assert(IN_SET(address->source, NETWORK_CONFIG_SOURCE_STATIC, NETWORK_CONFIG_SOURCE_DHCP4));
+
+        link = address->link;
+
+        switch (event) {
+        case SD_IPV4ACD_EVENT_STOP:
+                address->acd_bound = false;
+
+                if (address->source == NETWORK_CONFIG_SOURCE_STATIC) {
+                        r = static_ipv4acd_address_remove(link, address, /* on_conflict = */ false);
+                        if (r < 0)
+                                link_enter_failed(link);
+                }
+
+                /* We have nothing to do for DHCPv4 lease here, as the dhcp client is already stopped
+                 * when stopping the ipv4acd client. See link_stop_engines(). */
+                break;
+
+        case SD_IPV4ACD_EVENT_BIND:
+                address->acd_bound = true;
+
+                log_link_debug(link, "Successfully claimed address "IPV4_ADDRESS_FMT_STR,
+                               IPV4_ADDRESS_FMT_VAL(address->in_addr.in));
+                break;
+
+        case SD_IPV4ACD_EVENT_CONFLICT:
+                address->acd_bound = false;
+
+                log_link_warning(link, "Dropping address "IPV4_ADDRESS_FMT_STR", as an address conflict was detected.",
+                                 IPV4_ADDRESS_FMT_VAL(address->in_addr.in));
+
+                if (address->source == NETWORK_CONFIG_SOURCE_STATIC)
+                        r = static_ipv4acd_address_remove(link, address, /* on_conflict = */ true);
+                else
+                        r = dhcp4_address_on_conflict(link, address);
+                if (r < 0)
+                        link_enter_failed(link);
+                break;
+
+        default:
+                assert_not_reached();
+        }
+}
+
+static int ipv4acd_check_mac(sd_ipv4acd *acd, 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;
+}
+
+static int address_ipv4acd_start(Address *address) {
+        assert(address);
+        assert(address->link);
+
+        if (!address->acd)
+                return 0;
+
+        if (sd_ipv4acd_is_running(address->acd))
+                return 0;
+
+        if (!link_has_carrier(address->link))
+                return 0;
+
+        return sd_ipv4acd_start(address->acd, true);
+}
+
+int ipv4acd_configure(Address *address) {
+        Link *link;
+        int r;
+
+        assert(address);
+
+        link = ASSERT_PTR(address->link);
+
+        if (!address_ipv4acd_enabled(address)) {
+                address->acd = sd_ipv4acd_unref(address->acd);
+                address->acd_bound = false;
+                return 0;
+        }
+
+        if (address->acd)
+                return address_ipv4acd_start(address);
+
+        log_link_debug(link, "Configuring IPv4ACD for address "IPV4_ADDRESS_FMT_STR,
+                       IPV4_ADDRESS_FMT_VAL(address->in_addr.in));
+
+        r = sd_ipv4acd_new(&address->acd);
+        if (r < 0)
+                return r;
+
+        r = sd_ipv4acd_attach_event(address->acd, link->manager->event, 0);
+        if (r < 0)
+                return r;
+
+        r = sd_ipv4acd_set_ifindex(address->acd, link->ifindex);
+        if (r < 0)
+                return r;
+
+        r = sd_ipv4acd_set_mac(address->acd, &link->hw_addr.ether);
+        if (r < 0)
+                return r;
+
+        r = sd_ipv4acd_set_address(address->acd, &address->in_addr.in);
+        if (r < 0)
+                return r;
+
+        r = sd_ipv4acd_set_callback(address->acd, on_acd, address);
+        if (r < 0)
+                return r;
+
+        r = sd_ipv4acd_set_check_mac_callback(address->acd, ipv4acd_check_mac, link->manager);
+        if (r < 0)
+                return r;
+
+        return address_ipv4acd_start(address);
+}
+
+int ipv4acd_update_mac(Link *link) {
+        Address *address;
+        int k, r = 0;
+
+        assert(link);
+
+        if (link->hw_addr.length != ETH_ALEN)
+                return 0;
+        if (ether_addr_is_null(&link->hw_addr.ether))
+                return 0;
+
+        SET_FOREACH(address, link->addresses) {
+                if (!address->acd)
+                        continue;
+
+                k = sd_ipv4acd_set_mac(address->acd, &link->hw_addr.ether);
+                if (k < 0)
+                        r = k;
+        }
+        if (r < 0)
+                link_enter_failed(link);
+
+        return r;
+}
+
+int ipv4acd_start(Link *link) {
+        Address *address;
+        int r;
+
+        assert(link);
+
+        SET_FOREACH(address, link->addresses) {
+                r = address_ipv4acd_start(address);
+                if (r < 0)
+                        return r;
+        }
+
+        return 0;
+}
+
+int ipv4acd_stop(Link *link) {
+        Address *address;
+        int k, r = 0;
+
+        assert(link);
+
+        SET_FOREACH(address, link->addresses) {
+                if (!address->acd)
+                        continue;
+
+                k = sd_ipv4acd_stop(address->acd);
+                if (k < 0)
+                        r = k;
+        }
+
+        return r;
+}
+
+int ipv4acd_set_ifname(Link *link) {
+        Address *address;
+        int r;
+
+        assert(link);
+
+        SET_FOREACH(address, link->addresses) {
+                if (!address->acd)
+                        continue;
+
+                r = sd_ipv4acd_set_ifname(address->acd, link->ifname);
+                if (r < 0)
+                        return r;
+        }
+
+        return 0;
+}