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-rw-r--r--src/network/netdev/l2tp-tunnel.c728
1 files changed, 728 insertions, 0 deletions
diff --git a/src/network/netdev/l2tp-tunnel.c b/src/network/netdev/l2tp-tunnel.c
new file mode 100644
index 0000000..eeea197
--- /dev/null
+++ b/src/network/netdev/l2tp-tunnel.c
@@ -0,0 +1,728 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <netinet/in.h>
+#include <linux/l2tp.h>
+#include <linux/genetlink.h>
+
+#include "conf-parser.h"
+#include "hashmap.h"
+#include "l2tp-tunnel.h"
+#include "netlink-util.h"
+#include "networkd-address.h"
+#include "networkd-manager.h"
+#include "parse-util.h"
+#include "socket-util.h"
+#include "string-table.h"
+#include "string-util.h"
+#include "util.h"
+
+static const char* const l2tp_l2spec_type_table[_NETDEV_L2TP_L2SPECTYPE_MAX] = {
+ [NETDEV_L2TP_L2SPECTYPE_NONE] = "none",
+ [NETDEV_L2TP_L2SPECTYPE_DEFAULT] = "default",
+};
+
+DEFINE_PRIVATE_STRING_TABLE_LOOKUP_FROM_STRING(l2tp_l2spec_type, L2tpL2specType);
+
+static const char* const l2tp_encap_type_table[_NETDEV_L2TP_ENCAPTYPE_MAX] = {
+ [NETDEV_L2TP_ENCAPTYPE_UDP] = "udp",
+ [NETDEV_L2TP_ENCAPTYPE_IP] = "ip",
+};
+
+DEFINE_PRIVATE_STRING_TABLE_LOOKUP_FROM_STRING(l2tp_encap_type, L2tpEncapType);
+DEFINE_CONFIG_PARSE_ENUM(config_parse_l2tp_encap_type, l2tp_encap_type, L2tpEncapType, "Failed to parse L2TP Encapsulation Type");
+
+static const char* const l2tp_local_address_type_table[_NETDEV_L2TP_LOCAL_ADDRESS_MAX] = {
+ [NETDEV_L2TP_LOCAL_ADDRESS_AUTO] = "auto",
+ [NETDEV_L2TP_LOCAL_ADDRESS_STATIC] = "static",
+ [NETDEV_L2TP_LOCAL_ADDRESS_DYNAMIC] = "dynamic",
+};
+
+DEFINE_PRIVATE_STRING_TABLE_LOOKUP_FROM_STRING(l2tp_local_address_type, L2tpLocalAddressType);
+
+static void l2tp_session_free(L2tpSession *s) {
+ if (!s)
+ return;
+
+ if (s->tunnel && s->section)
+ ordered_hashmap_remove(s->tunnel->sessions_by_section, s->section);
+
+ network_config_section_free(s->section);
+
+ free(s->name);
+
+ free(s);
+}
+
+DEFINE_NETWORK_SECTION_FUNCTIONS(L2tpSession, l2tp_session_free);
+
+static int l2tp_session_new_static(L2tpTunnel *t, const char *filename, unsigned section_line, L2tpSession **ret) {
+ _cleanup_(network_config_section_freep) NetworkConfigSection *n = NULL;
+ _cleanup_(l2tp_session_freep) L2tpSession *s = NULL;
+ int r;
+
+ assert(t);
+ assert(ret);
+ assert(filename);
+ assert(section_line > 0);
+
+ r = network_config_section_new(filename, section_line, &n);
+ if (r < 0)
+ return r;
+
+ s = ordered_hashmap_get(t->sessions_by_section, n);
+ if (s) {
+ *ret = TAKE_PTR(s);
+ return 0;
+ }
+
+ s = new(L2tpSession, 1);
+ if (!s)
+ return -ENOMEM;
+
+ *s = (L2tpSession) {
+ .l2tp_l2spec_type = NETDEV_L2TP_L2SPECTYPE_DEFAULT,
+ .tunnel = t,
+ .section = TAKE_PTR(n),
+ };
+
+ r = ordered_hashmap_ensure_allocated(&t->sessions_by_section, &network_config_hash_ops);
+ if (r < 0)
+ return r;
+
+ r = ordered_hashmap_put(t->sessions_by_section, s->section, s);
+ if (r < 0)
+ return r;
+
+ *ret = TAKE_PTR(s);
+ return 0;
+}
+
+static int netdev_l2tp_fill_message_tunnel(NetDev *netdev, union in_addr_union *local_address, sd_netlink_message **ret) {
+ _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
+ uint16_t encap_type;
+ L2tpTunnel *t;
+ int r;
+
+ assert(netdev);
+ assert(local_address);
+
+ t = L2TP(netdev);
+
+ assert(t);
+
+ r = sd_genl_message_new(netdev->manager->genl, SD_GENL_L2TP, L2TP_CMD_TUNNEL_CREATE, &m);
+ if (r < 0)
+ return log_netdev_error_errno(netdev, r, "Failed to create generic netlink message: %m");
+
+ r = sd_netlink_message_append_u32(m, L2TP_ATTR_CONN_ID, t->tunnel_id);
+ if (r < 0)
+ return log_netdev_error_errno(netdev, r, "Could not append L2TP_ATTR_CONN_ID attribute: %m");
+
+ r = sd_netlink_message_append_u32(m, L2TP_ATTR_PEER_CONN_ID, t->peer_tunnel_id);
+ if (r < 0)
+ return log_netdev_error_errno(netdev, r, "Could not append L2TP_ATTR_PEER_CONN_ID attribute: %m");
+
+ r = sd_netlink_message_append_u8(m, L2TP_ATTR_PROTO_VERSION, 3);
+ if (r < 0)
+ return log_netdev_error_errno(netdev, r, "Could not append L2TP_ATTR_PROTO_VERSION attribute: %m");
+
+ switch(t->l2tp_encap_type) {
+ case NETDEV_L2TP_ENCAPTYPE_IP:
+ encap_type = L2TP_ENCAPTYPE_IP;
+ break;
+ case NETDEV_L2TP_ENCAPTYPE_UDP:
+ default:
+ encap_type = L2TP_ENCAPTYPE_UDP;
+ break;
+ }
+
+ r = sd_netlink_message_append_u16(m, L2TP_ATTR_ENCAP_TYPE, encap_type);
+ if (r < 0)
+ return log_netdev_error_errno(netdev, r, "Could not append L2TP_ATTR_ENCAP_TYPE attribute: %m");
+
+ if (t->family == AF_INET) {
+ r = sd_netlink_message_append_in_addr(m, L2TP_ATTR_IP_SADDR, &local_address->in);
+ if (r < 0)
+ return log_netdev_error_errno(netdev, r, "Could not append L2TP_ATTR_IP_SADDR attribute: %m");
+
+ r = sd_netlink_message_append_in_addr(m, L2TP_ATTR_IP_DADDR, &t->remote.in);
+ if (r < 0)
+ return log_netdev_error_errno(netdev, r, "Could not append L2TP_ATTR_IP_DADDR attribute: %m");
+ } else {
+ r = sd_netlink_message_append_in6_addr(m, L2TP_ATTR_IP6_SADDR, &local_address->in6);
+ if (r < 0)
+ return log_netdev_error_errno(netdev, r, "Could not append L2TP_ATTR_IP6_SADDR attribute: %m");
+
+ r = sd_netlink_message_append_in6_addr(m, L2TP_ATTR_IP6_DADDR, &t->remote.in6);
+ if (r < 0)
+ return log_netdev_error_errno(netdev, r, "Could not append L2TP_ATTR_IP6_DADDR attribute: %m");
+ }
+
+ if (encap_type == L2TP_ENCAPTYPE_UDP) {
+ r = sd_netlink_message_append_u16(m, L2TP_ATTR_UDP_SPORT, t->l2tp_udp_sport);
+ if (r < 0)
+ return log_netdev_error_errno(netdev, r, "Could not append L2TP_ATTR_UDP_SPORT, attribute: %m");
+
+ r = sd_netlink_message_append_u16(m, L2TP_ATTR_UDP_DPORT, t->l2tp_udp_dport);
+ if (r < 0)
+ return log_netdev_error_errno(netdev, r, "Could not append L2TP_ATTR_UDP_DPORT attribute: %m");
+
+ if (t->udp_csum) {
+ r = sd_netlink_message_append_u8(m, L2TP_ATTR_UDP_CSUM, t->udp_csum);
+ if (r < 0)
+ return log_netdev_error_errno(netdev, r, "Could not append L2TP_ATTR_UDP_CSUM attribute: %m");
+ }
+
+ if (t->udp6_csum_tx) {
+ r = sd_netlink_message_append_flag(m, L2TP_ATTR_UDP_ZERO_CSUM6_TX);
+ if (r < 0)
+ return log_netdev_error_errno(netdev, r, "Could not append L2TP_ATTR_UDP_ZERO_CSUM6_TX attribute: %m");
+ }
+
+ if (t->udp6_csum_rx) {
+ r = sd_netlink_message_append_flag(m, L2TP_ATTR_UDP_ZERO_CSUM6_RX);
+ if (r < 0)
+ return log_netdev_error_errno(netdev, r, "Could not append L2TP_ATTR_UDP_ZERO_CSUM6_RX attribute: %m");
+ }
+ }
+
+ *ret = TAKE_PTR(m);
+
+ return 0;
+}
+
+static int netdev_l2tp_fill_message_session(NetDev *netdev, L2tpSession *session, sd_netlink_message **ret) {
+ _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
+ uint16_t l2_spec_len;
+ uint8_t l2_spec_type;
+ int r;
+
+ assert(netdev);
+ assert(session);
+ assert(session->tunnel);
+
+ r = sd_genl_message_new(netdev->manager->genl, SD_GENL_L2TP, L2TP_CMD_SESSION_CREATE, &m);
+ if (r < 0)
+ return log_netdev_error_errno(netdev, r, "Failed to create generic netlink message: %m");
+
+ r = sd_netlink_message_append_u32(m, L2TP_ATTR_CONN_ID, session->tunnel->tunnel_id);
+ if (r < 0)
+ return log_netdev_error_errno(netdev, r, "Could not append L2TP_ATTR_CONN_ID attribute: %m");
+
+ r = sd_netlink_message_append_u32(m, L2TP_ATTR_PEER_CONN_ID, session->tunnel->peer_tunnel_id);
+ if (r < 0)
+ return log_netdev_error_errno(netdev, r, "Could not append L2TP_ATTR_PEER_CONN_ID attribute: %m");
+
+ r = sd_netlink_message_append_u32(m, L2TP_ATTR_SESSION_ID, session->session_id);
+ if (r < 0)
+ return log_netdev_error_errno(netdev, r, "Could not append L2TP_ATTR_SESSION_ID attribute: %m");
+
+ r = sd_netlink_message_append_u32(m, L2TP_ATTR_PEER_SESSION_ID, session->peer_session_id);
+ if (r < 0)
+ return log_netdev_error_errno(netdev, r, "Could not append L2TP_ATTR_PEER_SESSION_ID attribute: %m");
+
+ r = sd_netlink_message_append_u16(m, L2TP_ATTR_PW_TYPE, L2TP_PWTYPE_ETH);
+ if (r < 0)
+ return log_netdev_error_errno(netdev, r, "Could not append L2TP_ATTR_PW_TYPE attribute: %m");
+
+ switch (session->l2tp_l2spec_type) {
+ case NETDEV_L2TP_L2SPECTYPE_NONE:
+ l2_spec_type = L2TP_L2SPECTYPE_NONE;
+ l2_spec_len = 0;
+ break;
+ case NETDEV_L2TP_L2SPECTYPE_DEFAULT:
+ default:
+ l2_spec_type = L2TP_L2SPECTYPE_DEFAULT;
+ l2_spec_len = 4;
+ break;
+ }
+
+ r = sd_netlink_message_append_u8(m, L2TP_ATTR_L2SPEC_TYPE, l2_spec_type);
+ if (r < 0)
+ return log_netdev_error_errno(netdev, r, "Could not append L2TP_ATTR_L2SPEC_TYPE attribute: %m");
+
+ r = sd_netlink_message_append_u8(m, L2TP_ATTR_L2SPEC_LEN, l2_spec_len);
+ if (r < 0)
+ return log_netdev_error_errno(netdev, r, "Could not append L2TP_ATTR_L2SPEC_LEN attribute: %m");
+
+ r = sd_netlink_message_append_string(m, L2TP_ATTR_IFNAME, session->name);
+ if (r < 0)
+ return log_netdev_error_errno(netdev, r, "Could not append L2TP_ATTR_IFNAME attribute: %m");
+
+ *ret = TAKE_PTR(m);
+
+ return 0;
+}
+
+static int l2tp_acquire_local_address_one(L2tpTunnel *t, Address *a, union in_addr_union *ret) {
+ if (a->family != t->family)
+ return -EINVAL;
+
+ if (in_addr_is_null(a->family, &a->in_addr_peer) <= 0)
+ return -EINVAL;
+
+ if (t->local_address_type == NETDEV_L2TP_LOCAL_ADDRESS_STATIC &&
+ !FLAGS_SET(a->flags, IFA_F_PERMANENT))
+ return -EINVAL;
+
+ if (t->local_address_type == NETDEV_L2TP_LOCAL_ADDRESS_DYNAMIC &&
+ FLAGS_SET(a->flags, IFA_F_PERMANENT))
+ return -EINVAL;
+
+ *ret = a->in_addr;
+ return 0;
+}
+
+static int l2tp_acquire_local_address(L2tpTunnel *t, Link *link, union in_addr_union *ret) {
+ Address *a;
+
+ assert(t);
+ assert(link);
+ assert(ret);
+ assert(IN_SET(t->family, AF_INET, AF_INET6));
+
+ if (!in_addr_is_null(t->family, &t->local)) {
+ /* local address is explicitly specified. */
+ *ret = t->local;
+ return 0;
+ }
+
+ SET_FOREACH(a, link->addresses)
+ if (l2tp_acquire_local_address_one(t, a, ret) >= 0)
+ return 1;
+
+ SET_FOREACH(a, link->addresses_foreign)
+ if (l2tp_acquire_local_address_one(t, a, ret) >= 0)
+ return 1;
+
+ return -ENODATA;
+}
+
+static void l2tp_session_destroy_callback(L2tpSession *session) {
+ if (!session)
+ return;
+
+ netdev_unref(NETDEV(session->tunnel));
+}
+
+static int l2tp_create_session_handler(sd_netlink *rtnl, sd_netlink_message *m, L2tpSession *session) {
+ NetDev *netdev;
+ int r;
+
+ assert(session);
+ assert(session->tunnel);
+
+ netdev = NETDEV(session->tunnel);
+
+ r = sd_netlink_message_get_errno(m);
+ if (r == -EEXIST)
+ log_netdev_info(netdev, "L2TP session %s exists, using existing without changing its parameters",
+ session->name);
+ else if (r < 0) {
+ log_netdev_warning_errno(netdev, r, "L2TP session %s could not be created: %m", session->name);
+ return 1;
+ }
+
+ log_netdev_debug(netdev, "L2TP session %s created", session->name);
+ return 1;
+}
+
+static int l2tp_create_session(NetDev *netdev, L2tpSession *session) {
+ _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *n = NULL;
+ int r;
+
+ r = netdev_l2tp_fill_message_session(netdev, session, &n);
+ if (r < 0)
+ return r;
+
+ r = netlink_call_async(netdev->manager->genl, NULL, n, l2tp_create_session_handler,
+ l2tp_session_destroy_callback, session);
+ if (r < 0)
+ return log_netdev_error_errno(netdev, r, "Failed to create L2TP session %s: %m", session->name);
+
+ netdev_ref(netdev);
+ return 0;
+}
+
+static int l2tp_create_tunnel_handler(sd_netlink *rtnl, sd_netlink_message *m, NetDev *netdev) {
+ L2tpSession *session;
+ L2tpTunnel *t;
+ int r;
+
+ assert(netdev);
+ assert(netdev->state != _NETDEV_STATE_INVALID);
+
+ t = L2TP(netdev);
+
+ assert(t);
+
+ r = sd_netlink_message_get_errno(m);
+ if (r == -EEXIST)
+ log_netdev_info(netdev, "netdev exists, using existing without changing its parameters");
+ else if (r < 0) {
+ log_netdev_warning_errno(netdev, r, "netdev could not be created: %m");
+ netdev_drop(netdev);
+
+ return 1;
+ }
+
+ log_netdev_debug(netdev, "L2TP tunnel is created");
+
+ ORDERED_HASHMAP_FOREACH(session, t->sessions_by_section)
+ (void) l2tp_create_session(netdev, session);
+
+ return 1;
+}
+
+static int l2tp_create_tunnel(NetDev *netdev, Link *link) {
+ _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
+ union in_addr_union local_address;
+ L2tpTunnel *t;
+ int r;
+
+ assert(netdev);
+
+ t = L2TP(netdev);
+
+ assert(t);
+
+ r = l2tp_acquire_local_address(t, link, &local_address);
+ if (r < 0)
+ return log_netdev_error_errno(netdev, r, "Could not find local address.");
+
+ if (r > 0 && DEBUG_LOGGING) {
+ _cleanup_free_ char *str = NULL;
+
+ (void) in_addr_to_string(t->family, &local_address, &str);
+ log_netdev_debug(netdev, "Local address %s acquired.", strna(str));
+ }
+
+ r = netdev_l2tp_fill_message_tunnel(netdev, &local_address, &m);
+ if (r < 0)
+ return r;
+
+ r = netlink_call_async(netdev->manager->genl, NULL, m, l2tp_create_tunnel_handler,
+ netdev_destroy_callback, netdev);
+ if (r < 0)
+ return log_netdev_error_errno(netdev, r, "Failed to create L2TP tunnel: %m");
+
+ netdev_ref(netdev);
+
+ return 0;
+}
+
+int config_parse_l2tp_tunnel_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) {
+
+ L2tpTunnel *t = userdata;
+ union in_addr_union *addr = data;
+ int r;
+
+ assert(filename);
+ assert(lvalue);
+ assert(rvalue);
+ assert(data);
+
+ if (streq(lvalue, "Local")) {
+ L2tpLocalAddressType addr_type;
+
+ if (isempty(rvalue))
+ addr_type = NETDEV_L2TP_LOCAL_ADDRESS_AUTO;
+ else
+ addr_type = l2tp_local_address_type_from_string(rvalue);
+
+ if (addr_type >= 0) {
+ if (in_addr_is_null(t->family, &t->remote) != 0)
+ /* If Remote= is not specified yet, then also clear family. */
+ t->family = AF_UNSPEC;
+
+ t->local = IN_ADDR_NULL;
+ t->local_address_type = addr_type;
+
+ return 0;
+ }
+ }
+
+ if (t->family == AF_UNSPEC)
+ r = in_addr_from_string_auto(rvalue, &t->family, addr);
+ else
+ r = in_addr_from_string(t->family, rvalue, addr);
+ if (r < 0) {
+ log_syntax(unit, LOG_WARNING, filename, line, r,
+ "Invalid L2TP Tunnel address specified in %s='%s', ignoring assignment: %m", lvalue, rvalue);
+ return 0;
+ }
+
+ return 0;
+}
+
+int config_parse_l2tp_tunnel_id(
+ 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) {
+
+ uint32_t *id = data, k;
+ int r;
+
+ assert(filename);
+ assert(lvalue);
+ assert(rvalue);
+ assert(data);
+
+ r = safe_atou32(rvalue, &k);
+ if (r < 0) {
+ log_syntax(unit, LOG_WARNING, filename, line, r,
+ "Failed to parse L2TP tunnel id. Ignoring assignment: %s", rvalue);
+ return 0;
+ }
+
+ if (k == 0) {
+ log_syntax(unit, LOG_WARNING, filename, line, 0,
+ "Invalid L2TP tunnel id. Ignoring assignment: %s", rvalue);
+ return 0;
+ }
+
+ *id = k;
+
+ return 0;
+}
+
+int config_parse_l2tp_session_id(
+ 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_(l2tp_session_free_or_set_invalidp) L2tpSession *session = NULL;
+ L2tpTunnel *t = userdata;
+ uint32_t k;
+ int r;
+
+ assert(filename);
+ assert(section);
+ assert(lvalue);
+ assert(rvalue);
+ assert(data);
+
+ r = l2tp_session_new_static(t, filename, section_line, &session);
+ if (r < 0)
+ return log_oom();
+
+ r = safe_atou32(rvalue, &k);
+ if (r < 0) {
+ log_syntax(unit, LOG_WARNING, filename, line, r,
+ "Failed to parse L2TP session id. Ignoring assignment: %s", rvalue);
+ return 0;
+ }
+
+ if (k == 0) {
+ log_syntax(unit, LOG_WARNING, filename, line, 0,
+ "Invalid L2TP session id. Ignoring assignment: %s", rvalue);
+ return 0;
+ }
+
+ if (streq(lvalue, "SessionId"))
+ session->session_id = k;
+ else
+ session->peer_session_id = k;
+
+ session = NULL;
+ return 0;
+}
+
+int config_parse_l2tp_session_l2spec(
+ 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_(l2tp_session_free_or_set_invalidp) L2tpSession *session = NULL;
+ L2tpTunnel *t = userdata;
+ L2tpL2specType spec;
+ int r;
+
+ assert(filename);
+ assert(section);
+ assert(lvalue);
+ assert(rvalue);
+ assert(data);
+
+ r = l2tp_session_new_static(t, filename, section_line, &session);
+ if (r < 0)
+ return log_oom();
+
+ spec = l2tp_l2spec_type_from_string(rvalue);
+ if (spec < 0) {
+ log_syntax(unit, LOG_WARNING, filename, line, 0,
+ "Failed to parse layer2 specific header type. Ignoring assignment: %s", rvalue);
+ return 0;
+ }
+
+ session->l2tp_l2spec_type = spec;
+
+ session = NULL;
+ return 0;
+}
+
+int config_parse_l2tp_session_name(
+ 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_(l2tp_session_free_or_set_invalidp) L2tpSession *session = NULL;
+ L2tpTunnel *t = userdata;
+ int r;
+
+ assert(filename);
+ assert(section);
+ assert(lvalue);
+ assert(rvalue);
+ assert(data);
+
+ r = l2tp_session_new_static(t, filename, section_line, &session);
+ if (r < 0)
+ return log_oom();
+
+ if (!ifname_valid(rvalue)) {
+ log_syntax(unit, LOG_WARNING, filename, line, 0,
+ "Failed to parse L2TP tunnel session name. Ignoring assignment: %s", rvalue);
+ return 0;
+ }
+
+ r = free_and_strdup(&session->name, rvalue);
+ if (r < 0)
+ return log_oom();
+
+ session = NULL;
+ return 0;
+}
+
+static void l2tp_tunnel_init(NetDev *netdev) {
+ L2tpTunnel *t;
+
+ assert(netdev);
+
+ t = L2TP(netdev);
+
+ assert(t);
+
+ t->l2tp_encap_type = NETDEV_L2TP_ENCAPTYPE_UDP;
+ t->udp6_csum_rx = true;
+ t->udp6_csum_tx = true;
+}
+
+static int l2tp_session_verify(L2tpSession *session) {
+ NetDev *netdev;
+
+ assert(session);
+ assert(session->tunnel);
+
+ netdev = NETDEV(session->tunnel);
+
+ if (section_is_invalid(session->section))
+ return -EINVAL;
+
+ if (!session->name)
+ return log_netdev_error_errno(netdev, SYNTHETIC_ERRNO(EINVAL),
+ "%s: L2TP session without name configured. "
+ "Ignoring [L2TPSession] section from line %u",
+ session->section->filename, session->section->line);
+
+ if (session->session_id == 0 || session->peer_session_id == 0)
+ return log_netdev_error_errno(netdev, SYNTHETIC_ERRNO(EINVAL),
+ "%s: L2TP session without session IDs configured. "
+ "Ignoring [L2TPSession] section from line %u",
+ session->section->filename, session->section->line);
+
+ return 0;
+}
+
+static int netdev_l2tp_tunnel_verify(NetDev *netdev, const char *filename) {
+ L2tpTunnel *t;
+ L2tpSession *session;
+
+ assert(netdev);
+ assert(filename);
+
+ t = L2TP(netdev);
+
+ assert(t);
+
+ if (!IN_SET(t->family, AF_INET, AF_INET6))
+ return log_netdev_error_errno(netdev, SYNTHETIC_ERRNO(EINVAL),
+ "%s: L2TP tunnel with invalid address family configured. Ignoring",
+ filename);
+
+ if (in_addr_is_null(t->family, &t->remote))
+ return log_netdev_error_errno(netdev, SYNTHETIC_ERRNO(EINVAL),
+ "%s: L2TP tunnel without a remote address configured. Ignoring",
+ filename);
+
+ if (t->tunnel_id == 0 || t->peer_tunnel_id == 0)
+ return log_netdev_error_errno(netdev, SYNTHETIC_ERRNO(EINVAL),
+ "%s: L2TP tunnel without tunnel IDs configured. Ignoring",
+ filename);
+
+ ORDERED_HASHMAP_FOREACH(session, t->sessions_by_section)
+ if (l2tp_session_verify(session) < 0)
+ l2tp_session_free(session);
+
+ return 0;
+}
+
+static void l2tp_tunnel_done(NetDev *netdev) {
+ L2tpTunnel *t;
+
+ assert(netdev);
+
+ t = L2TP(netdev);
+
+ assert(t);
+
+ ordered_hashmap_free_with_destructor(t->sessions_by_section, l2tp_session_free);
+}
+
+const NetDevVTable l2tptnl_vtable = {
+ .object_size = sizeof(L2tpTunnel),
+ .init = l2tp_tunnel_init,
+ .sections = NETDEV_COMMON_SECTIONS "L2TP\0L2TPSession\0",
+ .create_after_configured = l2tp_create_tunnel,
+ .done = l2tp_tunnel_done,
+ .create_type = NETDEV_CREATE_AFTER_CONFIGURED,
+ .config_verify = netdev_l2tp_tunnel_verify,
+};