diff --git a/man/systemd.netdev.xml b/man/systemd.netdev.xml index 9d8f045da6..173b5f4104 100644 --- a/man/systemd.netdev.xml +++ b/man/systemd.netdev.xml @@ -153,6 +153,9 @@ geneve A GEneric NEtwork Virtualization Encapsulation (GENEVE) netdev driver. + l2tp + A Layer 2 Tunneling Protocol (L2TP) is a tunneling protocol used to support virtual private networks (VPNs) or as part of the delivery of services by ISPs. It does not provide any encryption or confidentiality by itself + vrf A Virtual Routing and Forwarding (VRF) interface to create separate routing and forwarding domains. @@ -739,6 +742,113 @@ + + [L2TP] Section Options + The [L2TP] section only applies for + netdevs of kind l2tp, and accepts the + following keys: + + + + TunnelId= + + Specifies the tunnel id. The value used must match the PeerTunnelId= value being used at the peer. + Ranges a number between 1 and 4294967295). This option is compulsory. + + + + PeerTunnelId= + + Specifies the peer tunnel id. The value used must match the PeerTunnelId= value being used at the peer. + Ranges a number between 1 and 4294967295). This option is compulsory. + + + + Remote= + + Specifies the IP address of the remote peer. This option is compulsory. + + + + Local= + + Specifies the IP address of the local interface. This address must be the address of a local interface. This option is compulsory. + + + + EncapsulationType= + + Specifies the encapsulation type of the tunnel. Takes one of udp or ip. + + + + UDPSourcePort= + + Specifies the UDP source port to be used for the tunnel. When UDP encapsulation is selected it's mandotory. Ignored when ip + encapsulation is selected. + + + + DestinationPort= + + Specifies destination port. When UDP encapsulation is selected it's mandotory. Ignored when ip + encapsulation is selected. + + + + UDPChecksum= + + Takes a boolean. When true, specifies if UDP checksum is calculated for transmitted packets over IPv4. + + + + UDP6ZeroChecksumTx= + + Takes a boolean. When true, skip UDP checksum calculation for transmitted packets over IPv6. + + + + UDP6ZeroChecksumRx= + + Takes a boolean. When true, allows incoming UDP packets over IPv6 with zero checksum field. + + + + + + [L2TPSession] Section Options + The [L2TPSession] section only applies for + netdevs of kind l2tp, and accepts the + following keys: + + + Name= + + Specifies the name of the sesssion. This option is compulsory. + + + + SessionId= + + Specifies the sesssion id. The value used must match the SessionId= value being used at the peer. + Ranges a number between 1 and 4294967295). This option is compulsory. + + + + PeerSessionId= + + Specifies the peer session id. The value used must match the PeerSessionId= value being used at the peer. + Ranges a number between 1 and 4294967295). This option is compulsory. + + + + Layer2SpecificHeader= + + Specifies layer2specific header type of the session. One of none or default. Defaults to default. + + + + [Tunnel] Section Options diff --git a/src/libsystemd/sd-netlink/generic-netlink.c b/src/libsystemd/sd-netlink/generic-netlink.c index 3445757da9..384072e881 100644 --- a/src/libsystemd/sd-netlink/generic-netlink.c +++ b/src/libsystemd/sd-netlink/generic-netlink.c @@ -10,9 +10,10 @@ typedef struct { } genl_family; static const genl_family genl_families[] = { - [SD_GENL_ID_CTRL] = { .name = "", .version = 1 }, + [SD_GENL_ID_CTRL] = { .name = "", .version = 1 }, [SD_GENL_WIREGUARD] = { .name = "wireguard", .version = 1 }, [SD_GENL_FOU] = { .name = "fou", .version = 1 }, + [SD_GENL_L2TP] = { .name = "l2tp", .version = 1}, }; int sd_genl_socket_open(sd_netlink **ret) { diff --git a/src/libsystemd/sd-netlink/netlink-types.c b/src/libsystemd/sd-netlink/netlink-types.c index 803de54712..92b044d5aa 100644 --- a/src/libsystemd/sd-netlink/netlink-types.c +++ b/src/libsystemd/sd-netlink/netlink-types.c @@ -15,6 +15,7 @@ #include #include #include +#include #include #if HAVE_LINUX_FOU_H @@ -797,10 +798,62 @@ static const NLTypeSystem genl_fou_cmds_type_system = { .types = genl_fou_cmds, }; +static const NLType genl_l2tp_types[] = { + [L2TP_ATTR_PW_TYPE] = { .type = NETLINK_TYPE_U16 }, + [L2TP_ATTR_ENCAP_TYPE] = { .type = NETLINK_TYPE_U16 }, + [L2TP_ATTR_OFFSET] = { .type = NETLINK_TYPE_U16 }, + [L2TP_ATTR_DATA_SEQ] = { .type = NETLINK_TYPE_U16 }, + [L2TP_ATTR_L2SPEC_TYPE] = { .type = NETLINK_TYPE_U8 }, + [L2TP_ATTR_L2SPEC_LEN] = { .type = NETLINK_TYPE_U8 }, + [L2TP_ATTR_PROTO_VERSION] = { .type = NETLINK_TYPE_U8 }, + [L2TP_ATTR_IFNAME] = { .type = NETLINK_TYPE_STRING }, + [L2TP_ATTR_CONN_ID] = { .type = NETLINK_TYPE_U32 }, + [L2TP_ATTR_PEER_CONN_ID] = { .type = NETLINK_TYPE_U32 }, + [L2TP_ATTR_SESSION_ID] = { .type = NETLINK_TYPE_U32 }, + [L2TP_ATTR_PEER_SESSION_ID] = { .type = NETLINK_TYPE_U32 }, + [L2TP_ATTR_UDP_CSUM] = { .type = NETLINK_TYPE_U8 }, + [L2TP_ATTR_VLAN_ID] = { .type = NETLINK_TYPE_U16 }, + [L2TP_ATTR_RECV_SEQ] = { .type = NETLINK_TYPE_U8 }, + [L2TP_ATTR_SEND_SEQ] = { .type = NETLINK_TYPE_U8 }, + [L2TP_ATTR_LNS_MODE] = { .type = NETLINK_TYPE_U8 }, + [L2TP_ATTR_USING_IPSEC] = { .type = NETLINK_TYPE_U8 }, + [L2TP_ATTR_FD] = { .type = NETLINK_TYPE_U32 }, + [L2TP_ATTR_IP_SADDR] = { .type = NETLINK_TYPE_IN_ADDR }, + [L2TP_ATTR_IP_DADDR] = { .type = NETLINK_TYPE_IN_ADDR }, + [L2TP_ATTR_UDP_SPORT] = { .type = NETLINK_TYPE_U16 }, + [L2TP_ATTR_UDP_DPORT] = { .type = NETLINK_TYPE_U16 }, + [L2TP_ATTR_IP6_SADDR] = { .type = NETLINK_TYPE_IN_ADDR }, + [L2TP_ATTR_IP6_DADDR] = { .type = NETLINK_TYPE_IN_ADDR }, + [L2TP_ATTR_UDP_ZERO_CSUM6_TX] = { .type = NETLINK_TYPE_FLAG }, + [L2TP_ATTR_UDP_ZERO_CSUM6_RX] = { .type = NETLINK_TYPE_FLAG }, +}; + +static const NLTypeSystem genl_l2tp_type_system = { + .count = ELEMENTSOF(genl_l2tp_types), + .types = genl_l2tp_types, +}; + +static const NLType genl_l2tp[] = { + [L2TP_CMD_TUNNEL_CREATE] = { .type = NETLINK_TYPE_NESTED, .type_system = &genl_l2tp_type_system }, + [L2TP_CMD_TUNNEL_DELETE] = { .type = NETLINK_TYPE_NESTED, .type_system = &genl_l2tp_type_system }, + [L2TP_CMD_TUNNEL_MODIFY] = { .type = NETLINK_TYPE_NESTED, .type_system = &genl_l2tp_type_system }, + [L2TP_CMD_TUNNEL_GET] = { .type = NETLINK_TYPE_NESTED, .type_system = &genl_l2tp_type_system }, + [L2TP_CMD_SESSION_CREATE] = { .type = NETLINK_TYPE_NESTED, .type_system = &genl_l2tp_type_system }, + [L2TP_CMD_SESSION_DELETE] = { .type = NETLINK_TYPE_NESTED, .type_system = &genl_l2tp_type_system }, + [L2TP_CMD_SESSION_MODIFY] = { .type = NETLINK_TYPE_NESTED, .type_system = &genl_l2tp_type_system }, + [L2TP_CMD_SESSION_GET] = { .type = NETLINK_TYPE_NESTED, .type_system = &genl_l2tp_type_system }, +}; + +static const NLTypeSystem genl_l2tp_tunnel_session_type_system = { + .count = ELEMENTSOF(genl_l2tp), + .types = genl_l2tp, +}; + static const NLType genl_families[] = { [SD_GENL_ID_CTRL] = { .type = NETLINK_TYPE_NESTED, .type_system = &genl_ctrl_id_ctrl_type_system }, [SD_GENL_WIREGUARD] = { .type = NETLINK_TYPE_NESTED, .type_system = &genl_wireguard_type_system }, [SD_GENL_FOU] = { .type = NETLINK_TYPE_NESTED, .type_system = &genl_fou_cmds_type_system}, + [SD_GENL_L2TP] = { .type = NETLINK_TYPE_NESTED, .type_system = &genl_l2tp_tunnel_session_type_system }, }; const NLTypeSystem genl_family_type_system_root = { diff --git a/src/network/meson.build b/src/network/meson.build index 8fe4854424..c95e750306 100644 --- a/src/network/meson.build +++ b/src/network/meson.build @@ -37,6 +37,8 @@ sources = files(''' netdev/netdevsim.h netdev/fou-tunnel.c netdev/fou-tunnel.h + netdev/l2tp-tunnel.c + netdev/l2tp-tunnel.h networkd-address-label.c networkd-address-label.h networkd-address-pool.c diff --git a/src/network/netdev/l2tp-tunnel.c b/src/network/netdev/l2tp-tunnel.c new file mode 100644 index 0000000000..16c7c108b8 --- /dev/null +++ b/src/network/netdev/l2tp-tunnel.c @@ -0,0 +1,586 @@ +/* SPDX-License-Identifier: LGPL-2.1+ */ + +#include +#include +#include + +#include "sd-netlink.h" + +#include "conf-parser.h" +#include "hashmap.h" +#include "l2tp-tunnel.h" +#include "missing.h" +#include "netlink-util.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 void l2tp_session_free(L2tpSession *s) { + if (!s) + return; + + if (s->tunnel && s->section) + ordered_hashmap_remove(s->tunnel->sessions_by_section, s); + + 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, sd_netlink_message **ret) { + _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL; + uint16_t encap_type; + L2tpTunnel *t; + int r; + + assert(netdev); + + 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, &t->local.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, &t->local.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 netdev_l2tp_tunnel_create(NetDev *netdev, Link *link) { + _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL; + L2tpTunnel *t; + L2tpSession *session; + uint32_t serial; + Iterator i; + int r; + + assert(netdev); + + t = L2TP(netdev); + + assert(t); + + r = netdev_l2tp_fill_message_tunnel(netdev, &m); + if (r < 0) + return r; + + r = sd_netlink_send(netdev->manager->genl, m, &serial); + if (r < 0) + return log_netdev_error_errno(netdev, r, "Failed to create L2TP tunnel: %m"); + + log_netdev_debug(netdev, "L2TP tunnel created"); + + ORDERED_HASHMAP_FOREACH(session, t->sessions_by_section, i) { + _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *n = NULL; + + r = netdev_l2tp_fill_message_session(netdev, session, &n); + if (r < 0) + continue; + + r = sd_netlink_send(netdev->manager->genl, n, &serial); + if (r < 0) + log_netdev_error_errno(netdev, r, "Failed to create L2TP session %s: %m", session->name); + + log_netdev_debug(netdev, "L2TP session %s created", session->name); + } + + 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 (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_ERR, 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_ERR, filename, line, r, + "Failed to parse L2TP tunnel id. Ignoring assignment: %s", rvalue); + return 0; + } + + if (k == 0) { + log_syntax(unit, LOG_ERR, filename, line, r, + "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 r; + + r = safe_atou32(rvalue, &k); + if (r < 0) { + log_syntax(unit, LOG_ERR, filename, line, r, + "Failed to parse L2TP session id. Ignoring assignment: %s", rvalue); + return 0; + } + + if (k == 0) { + log_syntax(unit, LOG_ERR, filename, line, r, + "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 r; + + spec = l2tp_l2spec_type_from_string(rvalue); + if (spec < 0) { + log_syntax(unit, LOG_ERR, 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 r; + + if (!ifname_valid(rvalue)) { + log_syntax(unit, LOG_ERR, filename, line, 0, + "Failed to parse L2TP tunnel session name. Ignoring assignment: %s", rvalue); + return 0; + } + + session->name = strdup(rvalue); + if (!session->name) + return -ENOMEM; + + 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; + Iterator i; + + 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->local) || in_addr_is_null(t->family, &t->remote)) + return log_netdev_error_errno(netdev, SYNTHETIC_ERRNO(EINVAL), + "%s: L2TP tunnel without a local or 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, i) + 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 = "Match\0NetDev\0L2TP\0L2TPSession", + .create_after_configured = netdev_l2tp_tunnel_create, + .done = l2tp_tunnel_done, + .create_type = NETDEV_CREATE_AFTER_CONFIGURED, + .config_verify = netdev_l2tp_tunnel_verify, +}; diff --git a/src/network/netdev/l2tp-tunnel.h b/src/network/netdev/l2tp-tunnel.h new file mode 100644 index 0000000000..e5fda4b973 --- /dev/null +++ b/src/network/netdev/l2tp-tunnel.h @@ -0,0 +1,68 @@ +/* SPDX-License-Identifier: LGPL-2.1+ */ +#pragma once + +#include + +#include "in-addr-util.h" +#include "netdev.h" +#include "networkd-util.h" + +typedef enum L2tpL2specType { + NETDEV_L2TP_L2SPECTYPE_NONE = L2TP_L2SPECTYPE_NONE, + NETDEV_L2TP_L2SPECTYPE_DEFAULT = L2TP_L2SPECTYPE_DEFAULT, + _NETDEV_L2TP_L2SPECTYPE_MAX, + _NETDEV_L2TP_L2SPECTYPE_INVALID = -1, +} L2tpL2specType; + +typedef enum L2tpEncapType { + NETDEV_L2TP_ENCAPTYPE_UDP = L2TP_ENCAPTYPE_UDP, + NETDEV_L2TP_ENCAPTYPE_IP = L2TP_ENCAPTYPE_IP, + _NETDEV_L2TP_ENCAPTYPE_MAX, + _NETDEV_L2TP_ENCAPTYPE_INVALID = -1, +} L2tpEncapType; + +typedef struct L2tpTunnel L2tpTunnel; + +typedef struct L2tpSession { + L2tpTunnel *tunnel; + NetworkConfigSection *section; + + char *name; + + uint32_t session_id; + uint32_t peer_session_id; + L2tpL2specType l2tp_l2spec_type; +} L2tpSession; + +struct L2tpTunnel { + NetDev meta; + + uint16_t l2tp_udp_sport; + uint16_t l2tp_udp_dport; + + uint32_t tunnel_id; + uint32_t peer_tunnel_id; + + int family; + + bool udp_csum; + bool udp6_csum_rx; + bool udp6_csum_tx; + + union in_addr_union local; + union in_addr_union remote; + + L2tpEncapType l2tp_encap_type; + + OrderedHashmap *sessions_by_section; +}; + +DEFINE_NETDEV_CAST(L2TP, L2tpTunnel); +extern const NetDevVTable l2tptnl_vtable; + +CONFIG_PARSER_PROTOTYPE(config_parse_l2tp_tunnel_address); +CONFIG_PARSER_PROTOTYPE(config_parse_l2tp_tunnel_id); +CONFIG_PARSER_PROTOTYPE(config_parse_l2tp_encap_type); +CONFIG_PARSER_PROTOTYPE(config_parse_l2tp_session_l2spec); +CONFIG_PARSER_PROTOTYPE(config_parse_l2tp_session_id); +CONFIG_PARSER_PROTOTYPE(config_parse_l2tp_session_name); diff --git a/src/network/netdev/netdev-gperf.gperf b/src/network/netdev/netdev-gperf.gperf index 29bdc65a21..3365023b32 100644 --- a/src/network/netdev/netdev-gperf.gperf +++ b/src/network/netdev/netdev-gperf.gperf @@ -20,6 +20,7 @@ _Pragma("GCC diagnostic ignored \"-Wimplicit-fallthrough\"") #include "netdev/vxcan.h" #include "netdev/wireguard.h" #include "netdev/fou-tunnel.h" +#include "netdev/l2tp-tunnel.h" #include "vlan-util.h" %} struct ConfigPerfItem; @@ -77,6 +78,20 @@ Tunnel.ISATAP, config_parse_tristate, 0, FooOverUDP.Protocol, config_parse_uint8, 0, offsetof(FouTunnel, fou_protocol) FooOverUDP.Encapsulation, config_parse_fou_encap_type, 0, offsetof(FouTunnel, fou_encap_type) FooOverUDP.Port, config_parse_ip_port, 0, offsetof(FouTunnel, port) +L2TP.TunnelId, config_parse_l2tp_tunnel_id, 0, offsetof(L2tpTunnel, tunnel_id) +L2TP.PeerTunnelId, config_parse_l2tp_tunnel_id, 0, offsetof(L2tpTunnel, peer_tunnel_id) +L2TP.UDPSourcePort, config_parse_ip_port, 0, offsetof(L2tpTunnel, l2tp_udp_sport) +L2TP.UDPDestinationPort, config_parse_ip_port, 0, offsetof(L2tpTunnel, l2tp_udp_dport) +L2TP.Local, config_parse_l2tp_tunnel_address, 0, offsetof(L2tpTunnel, local) +L2TP.Remote, config_parse_l2tp_tunnel_address, 0, offsetof(L2tpTunnel, remote) +L2TP.EncapsulationType, config_parse_l2tp_encap_type, 0, offsetof(L2tpTunnel, l2tp_encap_type) +L2TP.UDPCheckSum, config_parse_bool, 0, offsetof(L2tpTunnel, udp_csum) +L2TP.UDP6CheckSumRx, config_parse_bool, 0, offsetof(L2tpTunnel, udp6_csum_rx) +L2TP.UDP6CheckSumTx, config_parse_bool, 0, offsetof(L2tpTunnel, udp6_csum_tx) +L2TPSession.SessionId, config_parse_l2tp_session_id, 0, 0 +L2TPSession.PeerSessionId, config_parse_l2tp_session_id, 0, 0 +L2TPSession.Layer2SpecificHeader, config_parse_l2tp_session_l2spec, 0, 0 +L2TPSession.Name, config_parse_l2tp_session_name, 0, 0 Peer.Name, config_parse_ifname, 0, offsetof(Veth, ifname_peer) Peer.MACAddress, config_parse_hwaddr, 0, offsetof(Veth, mac_peer) VXCAN.Peer, config_parse_ifname, 0, offsetof(VxCan, ifname_peer) diff --git a/src/network/netdev/netdev.c b/src/network/netdev/netdev.c index c14ee91fe3..f60214ae11 100644 --- a/src/network/netdev/netdev.c +++ b/src/network/netdev/netdev.c @@ -7,35 +7,35 @@ #include "conf-parser.h" #include "fd-util.h" #include "list.h" +#include "netdev/bond.h" +#include "netdev/bridge.h" +#include "netdev/dummy.h" +#include "netdev/fou-tunnel.h" +#include "netdev/geneve.h" +#include "netdev/ipvlan.h" +#include "netdev/l2tp-tunnel.h" +#include "netdev/macvlan.h" +#include "netdev/netdev.h" +#include "netdev/netdevsim.h" +#include "netdev/tunnel.h" +#include "netdev/tuntap.h" +#include "netdev/vcan.h" +#include "netdev/veth.h" +#include "netdev/vlan.h" +#include "netdev/vrf.h" +#include "netdev/vxcan.h" +#include "netdev/vxlan.h" +#include "netdev/wireguard.h" #include "netlink-util.h" #include "network-internal.h" -#include "netdev/netdev.h" -#include "networkd-manager.h" #include "networkd-link.h" +#include "networkd-manager.h" #include "siphash24.h" #include "stat-util.h" #include "string-table.h" #include "string-util.h" #include "strv.h" -#include "netdev/bridge.h" -#include "netdev/bond.h" -#include "netdev/geneve.h" -#include "netdev/vlan.h" -#include "netdev/macvlan.h" -#include "netdev/ipvlan.h" -#include "netdev/vxlan.h" -#include "netdev/tunnel.h" -#include "netdev/tuntap.h" -#include "netdev/veth.h" -#include "netdev/dummy.h" -#include "netdev/vrf.h" -#include "netdev/vcan.h" -#include "netdev/vxcan.h" -#include "netdev/wireguard.h" -#include "netdev/netdevsim.h" -#include "netdev/fou-tunnel.h" - const NetDevVTable * const netdev_vtable[_NETDEV_KIND_MAX] = { [NETDEV_KIND_BRIDGE] = &bridge_vtable, [NETDEV_KIND_BOND] = &bond_vtable, @@ -65,6 +65,7 @@ const NetDevVTable * const netdev_vtable[_NETDEV_KIND_MAX] = { [NETDEV_KIND_NETDEVSIM] = &netdevsim_vtable, [NETDEV_KIND_FOU] = &foutnl_vtable, [NETDEV_KIND_ERSPAN] = &erspan_vtable, + [NETDEV_KIND_L2TP] = &l2tptnl_vtable, }; static const char* const netdev_kind_table[_NETDEV_KIND_MAX] = { @@ -96,6 +97,7 @@ static const char* const netdev_kind_table[_NETDEV_KIND_MAX] = { [NETDEV_KIND_NETDEVSIM] = "netdevsim", [NETDEV_KIND_FOU] = "fou", [NETDEV_KIND_ERSPAN] = "erspan", + [NETDEV_KIND_L2TP] = "l2tp", }; DEFINE_STRING_TABLE_LOOKUP(netdev_kind, NetDevKind); diff --git a/src/network/netdev/netdev.h b/src/network/netdev/netdev.h index 40f6b04f27..c46ed4d719 100644 --- a/src/network/netdev/netdev.h +++ b/src/network/netdev/netdev.h @@ -46,6 +46,7 @@ typedef enum NetDevKind { NETDEV_KIND_NETDEVSIM, NETDEV_KIND_FOU, NETDEV_KIND_ERSPAN, + NETDEV_KIND_L2TP, _NETDEV_KIND_MAX, _NETDEV_KIND_TUNNEL, /* Used by config_parse_stacked_netdev() */ _NETDEV_KIND_INVALID = -1 diff --git a/src/network/networkd-network-gperf.gperf b/src/network/networkd-network-gperf.gperf index cff81ff278..2db8299b13 100644 --- a/src/network/networkd-network-gperf.gperf +++ b/src/network/networkd-network-gperf.gperf @@ -45,6 +45,7 @@ Network.MACVLAN, config_parse_stacked_netdev, Network.MACVTAP, config_parse_stacked_netdev, NETDEV_KIND_MACVTAP, offsetof(Network, stacked_netdev_names) Network.IPVLAN, config_parse_stacked_netdev, NETDEV_KIND_IPVLAN, offsetof(Network, stacked_netdev_names) Network.VXLAN, config_parse_stacked_netdev, NETDEV_KIND_VXLAN, offsetof(Network, stacked_netdev_names) +Network.L2TP, config_parse_stacked_netdev, NETDEV_KIND_L2TP, offsetof(Network, stacked_netdev_names) Network.Tunnel, config_parse_stacked_netdev, _NETDEV_KIND_TUNNEL, offsetof(Network, stacked_netdev_names) Network.VRF, config_parse_ifname, 0, offsetof(Network, vrf_name) Network.DHCP, config_parse_dhcp, 0, offsetof(Network, dhcp) diff --git a/src/network/networkd-network.c b/src/network/networkd-network.c index 80f7a41cad..33055d9e3d 100644 --- a/src/network/networkd-network.c +++ b/src/network/networkd-network.c @@ -697,7 +697,8 @@ int config_parse_stacked_netdev(const char *unit, assert(data); assert(IN_SET(kind, NETDEV_KIND_VLAN, NETDEV_KIND_MACVLAN, NETDEV_KIND_MACVTAP, - NETDEV_KIND_IPVLAN, NETDEV_KIND_VXLAN, _NETDEV_KIND_TUNNEL)); + NETDEV_KIND_IPVLAN, NETDEV_KIND_VXLAN, NETDEV_KIND_L2TP, + _NETDEV_KIND_TUNNEL)); if (!ifname_valid(rvalue)) { log_syntax(unit, LOG_ERR, filename, line, 0, diff --git a/src/systemd/sd-netlink.h b/src/systemd/sd-netlink.h index 9e6e437bab..804fe9f03e 100644 --- a/src/systemd/sd-netlink.h +++ b/src/systemd/sd-netlink.h @@ -34,7 +34,13 @@ typedef struct sd_netlink sd_netlink; typedef struct sd_genl_socket sd_genl_socket; typedef struct sd_netlink_message sd_netlink_message; typedef struct sd_netlink_slot sd_netlink_slot; -typedef enum {SD_GENL_ID_CTRL, SD_GENL_WIREGUARD, SD_GENL_FOU} sd_genl_family; + +typedef enum sd_gen_family { + SD_GENL_ID_CTRL, + SD_GENL_WIREGUARD, + SD_GENL_FOU, + SD_GENL_L2TP, +} sd_genl_family; /* callback */ diff --git a/test/fuzz/fuzz-netdev-parser/directives.netdev b/test/fuzz/fuzz-netdev-parser/directives.netdev index 419ccda7dc..e0756dc755 100644 --- a/test/fuzz/fuzz-netdev-parser/directives.netdev +++ b/test/fuzz/fuzz-netdev-parser/directives.netdev @@ -157,3 +157,19 @@ MACAddress= MTUBytes= Description= Name= +[L2TP] +TunnelId= +PeerTunnelId= +UDPSourcePort= +UDPDestinationPort= +Local= +Remote= +EncapsulationType= +UDPCheckSum= +UDP6CheckSumRx= +UDP6CheckSumTx= +[L2TPSession] +SessionId= +PeerSessionId= +Layer2SpecificHeader= +Name= diff --git a/test/fuzz/fuzz-network-parser/directives.network b/test/fuzz/fuzz-network-parser/directives.network index 7d78081504..ddc60a9cbb 100644 --- a/test/fuzz/fuzz-network-parser/directives.network +++ b/test/fuzz/fuzz-network-parser/directives.network @@ -110,6 +110,7 @@ IPForward= IPv6Token= Description= VXLAN= +L2TP= LinkLocalAddressing= ConfigureWithoutCarrier= NTP=