summaryrefslogtreecommitdiffstats
path: root/src/network/networkd-dhcp-server-static-lease.c
diff options
context:
space:
mode:
authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-10 20:49:52 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-10 20:49:52 +0000
commit55944e5e40b1be2afc4855d8d2baf4b73d1876b5 (patch)
tree33f869f55a1b149e9b7c2b7e201867ca5dd52992 /src/network/networkd-dhcp-server-static-lease.c
parentInitial commit. (diff)
downloadsystemd-55944e5e40b1be2afc4855d8d2baf4b73d1876b5.tar.xz
systemd-55944e5e40b1be2afc4855d8d2baf4b73d1876b5.zip
Adding upstream version 255.4.upstream/255.4
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/network/networkd-dhcp-server-static-lease.c')
-rw-r--r--src/network/networkd-dhcp-server-static-lease.c210
1 files changed, 210 insertions, 0 deletions
diff --git a/src/network/networkd-dhcp-server-static-lease.c b/src/network/networkd-dhcp-server-static-lease.c
new file mode 100644
index 0000000..8e7eec6
--- /dev/null
+++ b/src/network/networkd-dhcp-server-static-lease.c
@@ -0,0 +1,210 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include "alloc-util.h"
+#include "ether-addr-util.h"
+#include "hashmap.h"
+#include "networkd-dhcp-server-static-lease.h"
+#include "networkd-network.h"
+#include "networkd-util.h"
+
+DEFINE_SECTION_CLEANUP_FUNCTIONS(DHCPStaticLease, dhcp_static_lease_free);
+
+DHCPStaticLease *dhcp_static_lease_free(DHCPStaticLease *static_lease) {
+ if (!static_lease)
+ return NULL;
+
+ if (static_lease->network && static_lease->section)
+ hashmap_remove(static_lease->network->dhcp_static_leases_by_section, static_lease->section);
+
+ config_section_free(static_lease->section);
+ free(static_lease->client_id);
+ return mfree(static_lease);
+}
+
+static int dhcp_static_lease_new(DHCPStaticLease **ret) {
+ DHCPStaticLease *p;
+
+ assert(ret);
+
+ p = new0(DHCPStaticLease, 1);
+ if (!p)
+ return -ENOMEM;
+
+ *ret = TAKE_PTR(p);
+ return 0;
+}
+
+static int lease_new_static(Network *network, const char *filename, unsigned section_line, DHCPStaticLease **ret) {
+ _cleanup_(config_section_freep) ConfigSection *n = NULL;
+ _cleanup_(dhcp_static_lease_freep) DHCPStaticLease *static_lease = NULL;
+ int r;
+
+ assert(network);
+ assert(filename);
+ assert(section_line > 0);
+ assert(ret);
+
+ r = config_section_new(filename, section_line, &n);
+ if (r < 0)
+ return r;
+
+ static_lease = hashmap_get(network->dhcp_static_leases_by_section, n);
+ if (static_lease) {
+ *ret = TAKE_PTR(static_lease);
+ return 0;
+ }
+
+ r = dhcp_static_lease_new(&static_lease);
+ if (r < 0)
+ return r;
+
+ static_lease->network = network;
+ static_lease->section = TAKE_PTR(n);
+ r = hashmap_ensure_put(&network->dhcp_static_leases_by_section, &config_section_hash_ops, static_lease->section, static_lease);
+ if (r < 0)
+ return r;
+
+ *ret = TAKE_PTR(static_lease);
+ return 0;
+}
+
+static int static_lease_verify(DHCPStaticLease *static_lease) {
+ if (section_is_invalid(static_lease->section))
+ return -EINVAL;
+
+ if (in4_addr_is_null(&static_lease->address))
+ return log_warning_errno(SYNTHETIC_ERRNO(EINVAL),
+ "%s: DHCP static lease without Address= field configured. "
+ "Ignoring [DHCPServerStaticLease] section from line %u.",
+ static_lease->section->filename, static_lease->section->line);
+
+ /* TODO: check that the address is in the pool. */
+
+ if (static_lease->client_id_size == 0 || !static_lease->client_id)
+ return log_warning_errno(SYNTHETIC_ERRNO(EINVAL),
+ "%s: DHCP static lease without MACAddress= field configured. "
+ "Ignoring [DHCPServerStaticLease] section from line %u.",
+ static_lease->section->filename, static_lease->section->line);
+
+ assert(static_lease->client_id_size == ETH_ALEN + 1);
+
+ return 0;
+}
+
+void network_drop_invalid_static_leases(Network *network) {
+ DHCPStaticLease *static_lease;
+
+ assert(network);
+
+ HASHMAP_FOREACH(static_lease, network->dhcp_static_leases_by_section)
+ if (static_lease_verify(static_lease) < 0)
+ dhcp_static_lease_free(static_lease);
+}
+
+int config_parse_dhcp_static_lease_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) {
+
+ _cleanup_(dhcp_static_lease_free_or_set_invalidp) DHCPStaticLease *lease = NULL;
+ Network *network = ASSERT_PTR(userdata);
+ union in_addr_union addr;
+ int r;
+
+ assert(filename);
+ assert(lvalue);
+ assert(rvalue);
+
+ r = lease_new_static(network, filename, section_line, &lease);
+ if (r < 0)
+ return log_oom();
+
+ if (isempty(rvalue)) {
+ lease->address.s_addr = 0;
+ TAKE_PTR(lease);
+ return 0;
+ }
+
+ r = in_addr_from_string(AF_INET, rvalue, &addr);
+ if (r < 0) {
+ log_syntax(unit, LOG_WARNING, filename, line, r,
+ "Failed to parse IPv4 address for DHCPv4 static lease, ignoring assignment: %s", rvalue);
+ return 0;
+ }
+ if (in4_addr_is_null(&addr.in)) {
+ log_syntax(unit, LOG_WARNING, filename, line, 0,
+ "IPv4 address for DHCPv4 static lease cannot be the ANY address, ignoring assignment: %s", rvalue);
+ return 0;
+ }
+
+ lease->address = addr.in;
+
+ TAKE_PTR(lease);
+ return 0;
+}
+
+int config_parse_dhcp_static_lease_hwaddr(
+ 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) {
+
+ _cleanup_(dhcp_static_lease_free_or_set_invalidp) DHCPStaticLease *lease = NULL;
+ Network *network = ASSERT_PTR(userdata);
+ struct ether_addr hwaddr;
+ uint8_t *c;
+ int r;
+
+ assert(filename);
+ assert(lvalue);
+ assert(rvalue);
+
+ r = lease_new_static(network, filename, section_line, &lease);
+ if (r < 0)
+ return log_oom();
+
+ if (isempty(rvalue)) {
+ lease->client_id = mfree(lease->client_id);
+ lease->client_id_size = 0;
+ return 0;
+ }
+
+ r = parse_ether_addr(rvalue, &hwaddr);
+ if (r < 0) {
+ log_syntax(unit, LOG_WARNING, filename, line, r,
+ "Failed to parse MAC address for DHCPv4 static lease, ignoring assignment: %s", rvalue);
+ return 0;
+ }
+ if (ether_addr_is_null(&hwaddr) || (hwaddr.ether_addr_octet[0] & 0x01)) {
+ log_syntax(unit, LOG_WARNING, filename, line, 0,
+ "MAC address for DHCPv4 static lease cannot be null or multicast, ignoring assignment: %s", rvalue);
+ return 0;
+ }
+
+ c = new(uint8_t, ETH_ALEN + 1);
+ if (!c)
+ return log_oom();
+
+ /* set client id type to 1: Ethernet Link-Layer (RFC 2132) */
+ c[0] = 0x01;
+ memcpy(c + 1, &hwaddr, ETH_ALEN);
+
+ free_and_replace(lease->client_id, c);
+ lease->client_id_size = ETH_ALEN + 1;
+
+ TAKE_PTR(lease);
+ return 0;
+}