diff options
Diffstat (limited to 'src/network/netdev/tunnel.c')
| -rw-r--r-- | src/network/netdev/tunnel.c | 1318 |
1 files changed, 1318 insertions, 0 deletions
diff --git a/src/network/netdev/tunnel.c b/src/network/netdev/tunnel.c new file mode 100644 index 0000000..db414a8 --- /dev/null +++ b/src/network/netdev/tunnel.c @@ -0,0 +1,1318 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ + +#include <netinet/in.h> +#include <linux/fou.h> +#include <linux/if_arp.h> +#include <linux/if_tunnel.h> +#include <linux/ip.h> +#include <linux/ip6_tunnel.h> + +#include "af-list.h" +#include "conf-parser.h" +#include "hexdecoct.h" +#include "missing_network.h" +#include "netlink-util.h" +#include "networkd-manager.h" +#include "parse-util.h" +#include "siphash24.h" +#include "string-table.h" +#include "string-util.h" +#include "tunnel.h" +#include "util.h" + +#define DEFAULT_IPV6_TTL 64 +#define IP6_FLOWINFO_FLOWLABEL htobe32(0x000FFFFF) +#define IP6_TNL_F_ALLOW_LOCAL_REMOTE 0x40 + +static const char* const ip6tnl_mode_table[_NETDEV_IP6_TNL_MODE_MAX] = { + [NETDEV_IP6_TNL_MODE_IP6IP6] = "ip6ip6", + [NETDEV_IP6_TNL_MODE_IPIP6] = "ipip6", + [NETDEV_IP6_TNL_MODE_ANYIP6] = "any", +}; + +DEFINE_STRING_TABLE_LOOKUP(ip6tnl_mode, Ip6TnlMode); +DEFINE_CONFIG_PARSE_ENUM(config_parse_ip6tnl_mode, ip6tnl_mode, Ip6TnlMode, "Failed to parse ip6 tunnel Mode"); + +#define HASH_KEY SD_ID128_MAKE(74,c4,de,12,f3,d9,41,34,bb,3d,c1,a4,42,93,50,87) + +int dhcp4_pd_create_6rd_tunnel_name(Link *link, char **ret) { + _cleanup_free_ char *ifname_alloc = NULL; + uint8_t ipv4masklen, sixrd_prefixlen, *buf, *p; + struct in_addr ipv4address; + struct in6_addr sixrd_prefix; + char ifname[IFNAMSIZ]; + uint64_t result; + size_t sz; + int r; + + assert(link); + assert(link->dhcp_lease); + + r = sd_dhcp_lease_get_address(link->dhcp_lease, &ipv4address); + if (r < 0) + return log_link_debug_errno(link, r, "Failed to get DHCPv4 address: %m"); + + r = sd_dhcp_lease_get_6rd(link->dhcp_lease, &ipv4masklen, &sixrd_prefixlen, &sixrd_prefix, NULL, NULL); + if (r < 0) + return log_link_debug_errno(link, r, "Failed to get 6rd option: %m"); + + sz = sizeof(uint8_t) * 2 + sizeof(struct in6_addr) + sizeof(struct in_addr); + buf = newa(uint8_t, sz); + p = buf; + p = mempcpy(p, &ipv4masklen, sizeof(uint8_t)); + p = mempcpy(p, &ipv4address, sizeof(struct in_addr)); + p = mempcpy(p, &sixrd_prefixlen, sizeof(uint8_t)); + p = mempcpy(p, &sixrd_prefix, sizeof(struct in6_addr)); + + result = siphash24(buf, sz, HASH_KEY.bytes); + memcpy(ifname, "6rd-", STRLEN("6rd-")); + ifname[STRLEN("6rd-") ] = urlsafe_base64char(result >> 54); + ifname[STRLEN("6rd-") + 1] = urlsafe_base64char(result >> 48); + ifname[STRLEN("6rd-") + 2] = urlsafe_base64char(result >> 42); + ifname[STRLEN("6rd-") + 3] = urlsafe_base64char(result >> 36); + ifname[STRLEN("6rd-") + 4] = urlsafe_base64char(result >> 30); + ifname[STRLEN("6rd-") + 5] = urlsafe_base64char(result >> 24); + ifname[STRLEN("6rd-") + 6] = urlsafe_base64char(result >> 18); + ifname[STRLEN("6rd-") + 7] = urlsafe_base64char(result >> 12); + ifname[STRLEN("6rd-") + 8] = urlsafe_base64char(result >> 6); + ifname[STRLEN("6rd-") + 9] = urlsafe_base64char(result); + ifname[STRLEN("6rd-") + 10] = '\0'; + assert_cc(STRLEN("6rd-") + 10 <= IFNAMSIZ); + + ifname_alloc = strdup(ifname); + if (!ifname_alloc) + return log_oom_debug(); + + *ret = TAKE_PTR(ifname_alloc); + return 0; +} + +static int dhcp4_pd_create_6rd_tunnel_message( + Link *link, + sd_netlink_message *m, + const struct in_addr *ipv4address, + uint8_t ipv4masklen, + const struct in6_addr *sixrd_prefix, + uint8_t sixrd_prefixlen) { + int r; + + r = sd_netlink_message_append_string(m, IFLA_IFNAME, link->dhcp4_6rd_tunnel_name); + if (r < 0) + return r; + + r = sd_netlink_message_open_container(m, IFLA_LINKINFO); + if (r < 0) + return r; + + r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, "sit"); + if (r < 0) + return r; + + r = sd_netlink_message_append_in_addr(m, IFLA_IPTUN_LOCAL, ipv4address); + if (r < 0) + return r; + + r = sd_netlink_message_append_u8(m, IFLA_IPTUN_TTL, 64); + if (r < 0) + return r; + + r = sd_netlink_message_append_in6_addr(m, IFLA_IPTUN_6RD_PREFIX, sixrd_prefix); + if (r < 0) + return r; + + r = sd_netlink_message_append_u16(m, IFLA_IPTUN_6RD_PREFIXLEN, sixrd_prefixlen); + if (r < 0) + return r; + + struct in_addr relay_prefix = *ipv4address; + (void) in4_addr_mask(&relay_prefix, ipv4masklen); + r = sd_netlink_message_append_u32(m, IFLA_IPTUN_6RD_RELAY_PREFIX, relay_prefix.s_addr); + if (r < 0) + return r; + + r = sd_netlink_message_append_u16(m, IFLA_IPTUN_6RD_RELAY_PREFIXLEN, ipv4masklen); + if (r < 0) + return r; + + r = sd_netlink_message_close_container(m); + if (r < 0) + return r; + + r = sd_netlink_message_close_container(m); + if (r < 0) + return r; + + return 0; +} + +int dhcp4_pd_create_6rd_tunnel(Link *link, link_netlink_message_handler_t callback) { + _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL; + uint8_t ipv4masklen, sixrd_prefixlen; + struct in_addr ipv4address; + struct in6_addr sixrd_prefix; + int r; + + assert(link); + assert(link->ifindex > 0); + assert(link->manager); + assert(link->dhcp_lease); + assert(link->dhcp4_6rd_tunnel_name); + assert(callback); + + r = sd_dhcp_lease_get_address(link->dhcp_lease, &ipv4address); + if (r < 0) + return log_link_debug_errno(link, r, "Failed to get DHCPv4 address: %m"); + + r = sd_dhcp_lease_get_6rd(link->dhcp_lease, &ipv4masklen, &sixrd_prefixlen, &sixrd_prefix, NULL, NULL); + if (r < 0) + return log_link_debug_errno(link, r, "Failed to get 6rd option: %m"); + + r = sd_rtnl_message_new_link(link->manager->rtnl, &m, RTM_NEWLINK, 0); + if (r < 0) + return log_link_debug_errno(link, r, "Failed to create netlink message: %m"); + + r = dhcp4_pd_create_6rd_tunnel_message(link, m, + &ipv4address, ipv4masklen, + &sixrd_prefix, sixrd_prefixlen); + if (r < 0) + return log_link_debug_errno(link, r, "Failed to fill netlink message: %m"); + + r = netlink_call_async(link->manager->rtnl, NULL, m, callback, + link_netlink_destroy_callback, link); + if (r < 0) + return log_link_debug_errno(link, r, "Could not send netlink message: %m"); + + link_ref(link); + + return 0; +} + +static int tunnel_get_local_address(Tunnel *t, Link *link, union in_addr_union *ret) { + assert(t); + + if (t->local_type < 0) { + if (ret) + *ret = t->local; + return 0; + } + + return link_get_local_address(link, t->local_type, t->family, NULL, ret); +} + +static int netdev_ipip_sit_fill_message_create(NetDev *netdev, Link *link, sd_netlink_message *m) { + union in_addr_union local; + Tunnel *t; + int r; + + assert(netdev); + assert(m); + + if (netdev->kind == NETDEV_KIND_IPIP) + t = IPIP(netdev); + else + t = SIT(netdev); + + assert(t); + + if (t->external) { + r = sd_netlink_message_append_flag(m, IFLA_IPTUN_COLLECT_METADATA); + if (r < 0) + return r; + + /* If external mode is enabled, then the following settings should not be appended. */ + return 0; + } + + if (link || t->assign_to_loopback) { + r = sd_netlink_message_append_u32(m, IFLA_IPTUN_LINK, link ? link->ifindex : LOOPBACK_IFINDEX); + if (r < 0) + return r; + } + + r = tunnel_get_local_address(t, link, &local); + if (r < 0) + return log_netdev_error_errno(netdev, r, "Could not find local address: %m"); + + r = sd_netlink_message_append_in_addr(m, IFLA_IPTUN_LOCAL, &local.in); + if (r < 0) + return r; + + r = sd_netlink_message_append_in_addr(m, IFLA_IPTUN_REMOTE, &t->remote.in); + if (r < 0) + return r; + + r = sd_netlink_message_append_u8(m, IFLA_IPTUN_TTL, t->ttl); + if (r < 0) + return r; + + r = sd_netlink_message_append_u8(m, IFLA_IPTUN_PMTUDISC, t->pmtudisc); + if (r < 0) + return r; + + if (t->fou_tunnel) { + r = sd_netlink_message_append_u16(m, IFLA_IPTUN_ENCAP_TYPE, t->fou_encap_type); + if (r < 0) + return r; + + r = sd_netlink_message_append_u16(m, IFLA_IPTUN_ENCAP_SPORT, htobe16(t->encap_src_port)); + if (r < 0) + return r; + + r = sd_netlink_message_append_u16(m, IFLA_IPTUN_ENCAP_DPORT, htobe16(t->fou_destination_port)); + if (r < 0) + return r; + } + + if (netdev->kind == NETDEV_KIND_SIT) { + if (t->sixrd_prefixlen > 0) { + r = sd_netlink_message_append_in6_addr(m, IFLA_IPTUN_6RD_PREFIX, &t->sixrd_prefix); + if (r < 0) + return r; + + /* u16 is deliberate here, even though we're passing a netmask that can never be >128. The kernel is + * expecting to receive the prefixlen as a u16. + */ + r = sd_netlink_message_append_u16(m, IFLA_IPTUN_6RD_PREFIXLEN, t->sixrd_prefixlen); + if (r < 0) + return r; + } + + if (t->isatap >= 0) { + uint16_t flags = 0; + + SET_FLAG(flags, SIT_ISATAP, t->isatap); + + r = sd_netlink_message_append_u16(m, IFLA_IPTUN_FLAGS, flags); + if (r < 0) + return r; + } + } + + return 0; +} + +static int netdev_gre_erspan_fill_message_create(NetDev *netdev, Link *link, sd_netlink_message *m) { + union in_addr_union local; + uint32_t ikey = 0; + uint32_t okey = 0; + uint16_t iflags = 0; + uint16_t oflags = 0; + Tunnel *t; + int r; + + assert(netdev); + assert(m); + + switch (netdev->kind) { + case NETDEV_KIND_GRE: + t = GRE(netdev); + break; + case NETDEV_KIND_ERSPAN: + t = ERSPAN(netdev); + break; + case NETDEV_KIND_GRETAP: + t = GRETAP(netdev); + break; + default: + assert_not_reached(); + } + + assert(t); + + if (t->external) { + r = sd_netlink_message_append_flag(m, IFLA_GRE_COLLECT_METADATA); + if (r < 0) + return r; + + /* If external mode is enabled, then the following settings should not be appended. */ + return 0; + } + + if (link || t->assign_to_loopback) { + r = sd_netlink_message_append_u32(m, IFLA_GRE_LINK, link ? link->ifindex : LOOPBACK_IFINDEX); + if (r < 0) + return r; + } + + if (netdev->kind == NETDEV_KIND_ERSPAN) { + r = sd_netlink_message_append_u8(m, IFLA_GRE_ERSPAN_VER, t->erspan_version); + if (r < 0) + return r; + + if (t->erspan_version == 1) { + r = sd_netlink_message_append_u32(m, IFLA_GRE_ERSPAN_INDEX, t->erspan_index); + if (r < 0) + return r; + + } else if (t->erspan_version == 2) { + r = sd_netlink_message_append_u8(m, IFLA_GRE_ERSPAN_DIR, t->erspan_direction); + if (r < 0) + return r; + + r = sd_netlink_message_append_u16(m, IFLA_GRE_ERSPAN_HWID, t->erspan_hwid); + if (r < 0) + return r; + } + } + + r = tunnel_get_local_address(t, link, &local); + if (r < 0) + return log_netdev_error_errno(netdev, r, "Could not find local address: %m"); + + r = sd_netlink_message_append_in_addr(m, IFLA_GRE_LOCAL, &local.in); + if (r < 0) + return r; + + r = sd_netlink_message_append_in_addr(m, IFLA_GRE_REMOTE, &t->remote.in); + if (r < 0) + return r; + + r = sd_netlink_message_append_u8(m, IFLA_GRE_TTL, t->ttl); + if (r < 0) + return r; + + r = sd_netlink_message_append_u8(m, IFLA_GRE_TOS, t->tos); + if (r < 0) + return r; + + r = sd_netlink_message_append_u8(m, IFLA_GRE_PMTUDISC, t->pmtudisc); + if (r < 0) + return r; + + if (t->key != 0) { + ikey = okey = htobe32(t->key); + iflags |= GRE_KEY; + oflags |= GRE_KEY; + } + + if (t->ikey != 0) { + ikey = htobe32(t->ikey); + iflags |= GRE_KEY; + } + + if (t->okey != 0) { + okey = htobe32(t->okey); + oflags |= GRE_KEY; + } + + if (t->gre_erspan_sequence > 0) { + iflags |= GRE_SEQ; + oflags |= GRE_SEQ; + } else if (t->gre_erspan_sequence == 0) { + iflags &= ~GRE_SEQ; + oflags &= ~GRE_SEQ; + } + + r = sd_netlink_message_append_u32(m, IFLA_GRE_IKEY, ikey); + if (r < 0) + return r; + + r = sd_netlink_message_append_u32(m, IFLA_GRE_OKEY, okey); + if (r < 0) + return r; + + r = sd_netlink_message_append_u16(m, IFLA_GRE_IFLAGS, iflags); + if (r < 0) + return r; + + r = sd_netlink_message_append_u16(m, IFLA_GRE_OFLAGS, oflags); + if (r < 0) + return r; + + if (t->fou_tunnel) { + r = sd_netlink_message_append_u16(m, IFLA_GRE_ENCAP_TYPE, t->fou_encap_type); + if (r < 0) + return r; + + r = sd_netlink_message_append_u16(m, IFLA_GRE_ENCAP_SPORT, htobe16(t->encap_src_port)); + if (r < 0) + return r; + + r = sd_netlink_message_append_u16(m, IFLA_GRE_ENCAP_DPORT, htobe16(t->fou_destination_port)); + if (r < 0) + return r; + } + + return 0; +} + +static int netdev_ip6gre_fill_message_create(NetDev *netdev, Link *link, sd_netlink_message *m) { + union in_addr_union local; + uint32_t ikey = 0; + uint32_t okey = 0; + uint16_t iflags = 0; + uint16_t oflags = 0; + Tunnel *t; + int r; + + assert(netdev); + assert(m); + + if (netdev->kind == NETDEV_KIND_IP6GRE) + t = IP6GRE(netdev); + else + t = IP6GRETAP(netdev); + + assert(t); + + if (t->external) { + r = sd_netlink_message_append_flag(m, IFLA_GRE_COLLECT_METADATA); + if (r < 0) + return r; + + /* If external mode is enabled, then the following settings should not be appended. */ + return 0; + } + + if (link || t->assign_to_loopback) { + r = sd_netlink_message_append_u32(m, IFLA_GRE_LINK, link ? link->ifindex : LOOPBACK_IFINDEX); + if (r < 0) + return r; + } + + r = tunnel_get_local_address(t, link, &local); + if (r < 0) + return log_netdev_error_errno(netdev, r, "Could not find local address: %m"); + + r = sd_netlink_message_append_in6_addr(m, IFLA_GRE_LOCAL, &local.in6); + if (r < 0) + return r; + + r = sd_netlink_message_append_in6_addr(m, IFLA_GRE_REMOTE, &t->remote.in6); + if (r < 0) + return r; + + r = sd_netlink_message_append_u8(m, IFLA_GRE_TTL, t->ttl); + if (r < 0) + return r; + + if (t->ipv6_flowlabel != _NETDEV_IPV6_FLOWLABEL_INVALID) { + r = sd_netlink_message_append_u32(m, IFLA_GRE_FLOWINFO, t->ipv6_flowlabel); + if (r < 0) + return r; + } + + r = sd_netlink_message_append_u32(m, IFLA_GRE_FLAGS, t->flags); + if (r < 0) + return r; + + if (t->key != 0) { + ikey = okey = htobe32(t->key); + iflags |= GRE_KEY; + oflags |= GRE_KEY; + } + + if (t->ikey != 0) { + ikey = htobe32(t->ikey); + iflags |= GRE_KEY; + } + + if (t->okey != 0) { + okey = htobe32(t->okey); + oflags |= GRE_KEY; + } + + r = sd_netlink_message_append_u32(m, IFLA_GRE_IKEY, ikey); + if (r < 0) + return r; + + r = sd_netlink_message_append_u32(m, IFLA_GRE_OKEY, okey); + if (r < 0) + return r; + + r = sd_netlink_message_append_u16(m, IFLA_GRE_IFLAGS, iflags); + if (r < 0) + return r; + + r = sd_netlink_message_append_u16(m, IFLA_GRE_OFLAGS, oflags); + if (r < 0) + return r; + + return 0; +} + +static int netdev_vti_fill_message_create(NetDev *netdev, Link *link, sd_netlink_message *m) { + union in_addr_union local; + uint32_t ikey, okey; + Tunnel *t; + int r; + + assert(netdev); + assert(m); + + if (netdev->kind == NETDEV_KIND_VTI) + t = VTI(netdev); + else + t = VTI6(netdev); + + assert(t); + + if (link || t->assign_to_loopback) { + r = sd_netlink_message_append_u32(m, IFLA_VTI_LINK, link ? link->ifindex : LOOPBACK_IFINDEX); + if (r < 0) + return r; + } + + if (t->key != 0) + ikey = okey = htobe32(t->key); + else { + ikey = htobe32(t->ikey); + okey = htobe32(t->okey); + } + + r = sd_netlink_message_append_u32(m, IFLA_VTI_IKEY, ikey); + if (r < 0) + return r; + + r = sd_netlink_message_append_u32(m, IFLA_VTI_OKEY, okey); + if (r < 0) + return r; + + r = tunnel_get_local_address(t, link, &local); + if (r < 0) + return log_netdev_error_errno(netdev, r, "Could not find local address: %m"); + + r = netlink_message_append_in_addr_union(m, IFLA_VTI_LOCAL, t->family, &local); + if (r < 0) + return r; + + r = netlink_message_append_in_addr_union(m, IFLA_VTI_REMOTE, t->family, &t->remote); + if (r < 0) + return r; + + return 0; +} + +static int netdev_ip6tnl_fill_message_create(NetDev *netdev, Link *link, sd_netlink_message *m) { + union in_addr_union local; + uint8_t proto; + Tunnel *t; + int r; + + assert(netdev); + assert(m); + + t = IP6TNL(netdev); + + assert(t); + + switch (t->ip6tnl_mode) { + case NETDEV_IP6_TNL_MODE_IP6IP6: + proto = IPPROTO_IPV6; + break; + case NETDEV_IP6_TNL_MODE_IPIP6: + proto = IPPROTO_IPIP; + break; + case NETDEV_IP6_TNL_MODE_ANYIP6: + default: + proto = 0; + break; + } + + r = sd_netlink_message_append_u8(m, IFLA_IPTUN_PROTO, proto); + if (r < 0) + return r; + + if (t->external) { + r = sd_netlink_message_append_flag(m, IFLA_IPTUN_COLLECT_METADATA); + if (r < 0) + return r; + + /* If external mode is enabled, then the following settings should not be appended. */ + return 0; + } + + if (link || t->assign_to_loopback) { + r = sd_netlink_message_append_u32(m, IFLA_IPTUN_LINK, link ? link->ifindex : LOOPBACK_IFINDEX); + if (r < 0) + return r; + } + + r = tunnel_get_local_address(t, link, &local); + if (r < 0) + return log_netdev_error_errno(netdev, r, "Could not find local address: %m"); + + r = sd_netlink_message_append_in6_addr(m, IFLA_IPTUN_LOCAL, &local.in6); + if (r < 0) + return r; + + r = sd_netlink_message_append_in6_addr(m, IFLA_IPTUN_REMOTE, &t->remote.in6); + if (r < 0) + return r; + + r = sd_netlink_message_append_u8(m, IFLA_IPTUN_TTL, t->ttl); + if (r < 0) + return r; + + if (t->ipv6_flowlabel != _NETDEV_IPV6_FLOWLABEL_INVALID) { + r = sd_netlink_message_append_u32(m, IFLA_IPTUN_FLOWINFO, t->ipv6_flowlabel); + if (r < 0) + return r; + } + + if (t->copy_dscp) + t->flags |= IP6_TNL_F_RCV_DSCP_COPY; + + if (t->allow_localremote >= 0) + SET_FLAG(t->flags, IP6_TNL_F_ALLOW_LOCAL_REMOTE, t->allow_localremote); + + r = sd_netlink_message_append_u32(m, IFLA_IPTUN_FLAGS, t->flags); + if (r < 0) + return r; + + if (t->encap_limit != 0) { + r = sd_netlink_message_append_u8(m, IFLA_IPTUN_ENCAP_LIMIT, t->encap_limit); + if (r < 0) + return r; + } + + return 0; +} + +static int netdev_tunnel_is_ready_to_create(NetDev *netdev, Link *link) { + Tunnel *t; + + assert(netdev); + + t = TUNNEL(netdev); + + assert(t); + + if (t->independent) + return true; + + return tunnel_get_local_address(t, link, NULL) >= 0; +} + +static int netdev_tunnel_verify(NetDev *netdev, const char *filename) { + Tunnel *t; + + assert(netdev); + assert(filename); + + t = TUNNEL(netdev); + + assert(t); + + if (netdev->kind == NETDEV_KIND_IP6TNL && + t->ip6tnl_mode == _NETDEV_IP6_TNL_MODE_INVALID) + return log_netdev_error_errno(netdev, SYNTHETIC_ERRNO(EINVAL), + "ip6tnl without mode configured in %s. Ignoring", filename); + + if (t->external) { + if (IN_SET(netdev->kind, NETDEV_KIND_VTI, NETDEV_KIND_VTI6)) + log_netdev_debug(netdev, "vti/vti6 tunnel do not support external mode, ignoring."); + else { + /* tunnel with external mode does not require underlying interface. */ + t->independent = true; + + /* tunnel with external mode does not require any settings checked below. */ + return 0; + } + } + + if (IN_SET(netdev->kind, NETDEV_KIND_VTI, NETDEV_KIND_IPIP, NETDEV_KIND_SIT, NETDEV_KIND_GRE) && + !IN_SET(t->family, AF_UNSPEC, AF_INET)) + return log_netdev_error_errno(netdev, SYNTHETIC_ERRNO(EINVAL), + "vti/ipip/sit/gre tunnel without a local/remote IPv4 address configured in %s. Ignoring", filename); + + if (IN_SET(netdev->kind, NETDEV_KIND_GRETAP, NETDEV_KIND_ERSPAN) && + (t->family != AF_INET || !in_addr_is_set(t->family, &t->remote))) + return log_netdev_error_errno(netdev, SYNTHETIC_ERRNO(EINVAL), + "gretap/erspan tunnel without a remote IPv4 address configured in %s. Ignoring", filename); + + if ((IN_SET(netdev->kind, NETDEV_KIND_VTI6, NETDEV_KIND_IP6TNL) && t->family != AF_INET6) || + (netdev->kind == NETDEV_KIND_IP6GRE && !IN_SET(t->family, AF_UNSPEC, AF_INET6))) + return log_netdev_error_errno(netdev, SYNTHETIC_ERRNO(EINVAL), + "vti6/ip6tnl/ip6gre tunnel without a local/remote IPv6 address configured in %s. Ignoring", filename); + + if (netdev->kind == NETDEV_KIND_IP6GRETAP && + (t->family != AF_INET6 || !in_addr_is_set(t->family, &t->remote))) + return log_netdev_error_errno(netdev, SYNTHETIC_ERRNO(EINVAL), + "ip6gretap tunnel without a remote IPv6 address configured in %s. Ignoring", filename); + + if (t->fou_tunnel && t->fou_destination_port <= 0) + return log_netdev_error_errno(netdev, SYNTHETIC_ERRNO(EINVAL), + "FooOverUDP missing port configured in %s. Ignoring", filename); + + /* netlink_message_append_in_addr_union() is used for vti/vti6. So, t->family cannot be AF_UNSPEC. */ + if (netdev->kind == NETDEV_KIND_VTI) + t->family = AF_INET; + + if (t->assign_to_loopback) + t->independent = true; + + if (t->independent && t->local_type >= 0) + return log_netdev_error_errno(netdev, SYNTHETIC_ERRNO(EINVAL), + "The local address cannot be '%s' when Independent= or AssignToLoopback= is enabled, ignoring.", + strna(netdev_local_address_type_to_string(t->local_type))); + + return 0; +} + +static int unset_local(Tunnel *t) { + assert(t); + + /* Unset the previous assignment. */ + t->local = IN_ADDR_NULL; + t->local_type = _NETDEV_LOCAL_ADDRESS_TYPE_INVALID; + + /* If the remote address is not specified, also clear the address family. */ + if (!in_addr_is_set(t->family, &t->remote)) + t->family = AF_UNSPEC; + + return 0; +} + +int config_parse_tunnel_local_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 buffer = IN_ADDR_NULL; + NetDevLocalAddressType type; + Tunnel *t = ASSERT_PTR(userdata); + int r, f; + + assert(filename); + assert(lvalue); + assert(rvalue); + + if (isempty(rvalue) || streq(rvalue, "any")) + return unset_local(t); + + type = netdev_local_address_type_from_string(rvalue); + if (IN_SET(type, NETDEV_LOCAL_ADDRESS_IPV4LL, NETDEV_LOCAL_ADDRESS_DHCP4)) + f = AF_INET; + else if (IN_SET(type, NETDEV_LOCAL_ADDRESS_IPV6LL, NETDEV_LOCAL_ADDRESS_DHCP6, NETDEV_LOCAL_ADDRESS_SLAAC)) + f = AF_INET6; + else { + type = _NETDEV_LOCAL_ADDRESS_TYPE_INVALID; + r = in_addr_from_string_auto(rvalue, &f, &buffer); + if (r < 0) { + log_syntax(unit, LOG_WARNING, filename, line, r, + "Tunnel address \"%s\" invalid, ignoring assignment: %m", rvalue); + return 0; + } + + if (in_addr_is_null(f, &buffer)) + return unset_local(t); + } + + if (t->family != AF_UNSPEC && t->family != f) { + log_syntax(unit, LOG_WARNING, filename, line, 0, + "Address family does not match the previous assignment, ignoring assignment: %s", rvalue); + return 0; + } + + t->family = f; + t->local = buffer; + t->local_type = type; + return 0; +} + +static int unset_remote(Tunnel *t) { + assert(t); + + /* Unset the previous assignment. */ + t->remote = IN_ADDR_NULL; + + /* If the local address is not specified, also clear the address family. */ + if (t->local_type == _NETDEV_LOCAL_ADDRESS_TYPE_INVALID && + !in_addr_is_set(t->family, &t->local)) + t->family = AF_UNSPEC; + + return 0; +} + +int config_parse_tunnel_remote_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 buffer; + Tunnel *t = ASSERT_PTR(userdata); + int r, f; + + assert(filename); + assert(lvalue); + assert(rvalue); + + if (isempty(rvalue) || streq(rvalue, "any")) + return unset_remote(t); + + r = in_addr_from_string_auto(rvalue, &f, &buffer); + if (r < 0) { + log_syntax(unit, LOG_WARNING, filename, line, r, + "Tunnel address \"%s\" invalid, ignoring assignment: %m", rvalue); + return 0; + } + + if (in_addr_is_null(f, &buffer)) + return unset_remote(t); + + if (t->family != AF_UNSPEC && t->family != f) { + log_syntax(unit, LOG_WARNING, filename, line, 0, + "Address family does not match the previous assignment, ignoring assignment: %s", rvalue); + return 0; + } + + t->family = f; + t->remote = buffer; + return 0; +} + +int config_parse_tunnel_key( + 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 *dest = ASSERT_PTR(data), k; + union in_addr_union buffer; + int r; + + assert(filename); + assert(rvalue); + + r = in_addr_from_string(AF_INET, rvalue, &buffer); + if (r < 0) { + r = safe_atou32(rvalue, &k); + if (r < 0) { + log_syntax(unit, LOG_WARNING, filename, line, r, + "Failed to parse tunnel key ignoring assignment: %s", rvalue); + return 0; + } + } else + k = be32toh(buffer.in.s_addr); + + *dest = k; + return 0; +} + +int config_parse_ipv6_flowlabel( + 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) { + + Tunnel *t = ASSERT_PTR(userdata); + int k, r; + + assert(filename); + assert(rvalue); + + if (streq(rvalue, "inherit")) { + t->ipv6_flowlabel = IP6_FLOWINFO_FLOWLABEL; + t->flags |= IP6_TNL_F_USE_ORIG_FLOWLABEL; + return 0; + } + + r = safe_atoi(rvalue, &k); + if (r < 0) { + log_syntax(unit, LOG_WARNING, filename, line, r, + "Failed to parse tunnel IPv6 flowlabel, ignoring assignment: %s", rvalue); + return 0; + } + + if (k > 0xFFFFF) { + log_syntax(unit, LOG_WARNING, filename, line, 0, + "Invalid tunnel IPv6 flowlabel, ignoring assignment: %s", rvalue); + return 0; + } + + t->ipv6_flowlabel = htobe32(k) & IP6_FLOWINFO_FLOWLABEL; + t->flags &= ~IP6_TNL_F_USE_ORIG_FLOWLABEL; + return 0; +} + +int config_parse_encap_limit( + 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) { + + Tunnel *t = ASSERT_PTR(userdata); + int k, r; + + assert(filename); + assert(rvalue); + + if (streq(rvalue, "none")) { + t->flags |= IP6_TNL_F_IGN_ENCAP_LIMIT; + t->encap_limit = 0; + return 0; + } + + r = safe_atoi(rvalue, &k); + if (r < 0) { + log_syntax(unit, LOG_WARNING, filename, line, r, + "Failed to parse Tunnel Encapsulation Limit option, ignoring assignment: %s", rvalue); + return 0; + } + + if (k > 255 || k < 0) { + log_syntax(unit, LOG_WARNING, filename, line, 0, + "Invalid Tunnel Encapsulation value, ignoring assignment: %d", k); + return 0; + } + + t->encap_limit = k; + t->flags &= ~IP6_TNL_F_IGN_ENCAP_LIMIT; + return 0; +} + +int config_parse_6rd_prefix( + 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) { + + Tunnel *t = userdata; + union in_addr_union p; + uint8_t l; + int r; + + assert(filename); + assert(lvalue); + assert(rvalue); + + r = in_addr_prefix_from_string(rvalue, AF_INET6, &p, &l); + if (r < 0) { + log_syntax(unit, LOG_WARNING, filename, line, r, "Failed to parse 6rd prefix \"%s\", ignoring: %m", rvalue); + return 0; + } + if (l == 0) { + log_syntax(unit, LOG_WARNING, filename, line, 0, "6rd prefix length of \"%s\" must be greater than zero, ignoring", rvalue); + return 0; + } + + t->sixrd_prefix = p.in6; + t->sixrd_prefixlen = l; + + return 0; +} + +int config_parse_erspan_version( + 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) { + + uint8_t n, *v = ASSERT_PTR(data); + int r; + + assert(filename); + assert(lvalue); + assert(rvalue); + + if (isempty(rvalue)) { + *v = 1; /* defaults to 1 */ + return 0; + } + + r = safe_atou8(rvalue, &n); + if (r < 0) { + log_syntax(unit, LOG_WARNING, filename, line, r, + "Failed to parse erspan version \"%s\", ignoring: %m", rvalue); + return 0; + } + if (!IN_SET(n, 0, 1, 2)) { + log_syntax(unit, LOG_WARNING, filename, line, 0, + "Invalid erspan version \"%s\", which must be 0, 1 or 2, ignoring.", rvalue); + return 0; + } + + *v = n; + return 0; +} + +int config_parse_erspan_index( + 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 n, *v = ASSERT_PTR(data); + int r; + + assert(filename); + assert(lvalue); + assert(rvalue); + + if (isempty(rvalue)) { + *v = 0; /* defaults to 0 */ + return 0; + } + + r = safe_atou32(rvalue, &n); + if (r < 0) { + log_syntax(unit, LOG_WARNING, filename, line, r, + "Failed to parse erspan index \"%s\", ignoring: %m", rvalue); + return 0; + } + if (n >= 0x100000) { + log_syntax(unit, LOG_WARNING, filename, line, 0, + "Invalid erspan index \"%s\", which must be less than 0x100000, ignoring.", rvalue); + return 0; + } + + *v = n; + return 0; +} + +int config_parse_erspan_direction( + 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) { + + uint8_t *v = ASSERT_PTR(data); + + assert(filename); + assert(lvalue); + assert(rvalue); + + if (isempty(rvalue) || streq(rvalue, "ingress")) + *v = 0; /* defaults to ingress */ + else if (streq(rvalue, "egress")) + *v = 1; + else + log_syntax(unit, LOG_WARNING, filename, line, 0, + "Invalid erspan direction \"%s\", which must be \"ingress\" or \"egress\", ignoring.", rvalue); + + return 0; +} + +int config_parse_erspan_hwid( + 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) { + + uint16_t n, *v = ASSERT_PTR(data); + int r; + + assert(filename); + assert(lvalue); + assert(rvalue); + + if (isempty(rvalue)) { + *v = 0; /* defaults to 0 */ + return 0; + } + + r = safe_atou16(rvalue, &n); + if (r < 0) { + log_syntax(unit, LOG_WARNING, filename, line, r, + "Failed to parse erspan hwid \"%s\", ignoring: %m", rvalue); + return 0; + } + if (n >= 64) { + log_syntax(unit, LOG_WARNING, filename, line, 0, + "Invalid erspan index \"%s\", which must be less than 64, ignoring.", rvalue); + return 0; + } + + *v = n; + return 0; +} + +static void netdev_tunnel_init(NetDev *netdev) { + Tunnel *t; + + assert(netdev); + + t = TUNNEL(netdev); + + assert(t); + + t->local_type = _NETDEV_LOCAL_ADDRESS_TYPE_INVALID; + t->pmtudisc = true; + t->fou_encap_type = NETDEV_FOO_OVER_UDP_ENCAP_DIRECT; + t->isatap = -1; + t->gre_erspan_sequence = -1; + t->encap_limit = IPV6_DEFAULT_TNL_ENCAP_LIMIT; + t->ip6tnl_mode = _NETDEV_IP6_TNL_MODE_INVALID; + t->ipv6_flowlabel = _NETDEV_IPV6_FLOWLABEL_INVALID; + t->allow_localremote = -1; + t->erspan_version = 1; + + if (IN_SET(netdev->kind, NETDEV_KIND_IP6GRE, NETDEV_KIND_IP6GRETAP, NETDEV_KIND_IP6TNL)) + t->ttl = DEFAULT_IPV6_TTL; +} + +const NetDevVTable ipip_vtable = { + .object_size = sizeof(Tunnel), + .init = netdev_tunnel_init, + .sections = NETDEV_COMMON_SECTIONS "Tunnel\0", + .fill_message_create = netdev_ipip_sit_fill_message_create, + .create_type = NETDEV_CREATE_STACKED, + .is_ready_to_create = netdev_tunnel_is_ready_to_create, + .config_verify = netdev_tunnel_verify, + .iftype = ARPHRD_TUNNEL, +}; + +const NetDevVTable sit_vtable = { + .object_size = sizeof(Tunnel), + .init = netdev_tunnel_init, + .sections = NETDEV_COMMON_SECTIONS "Tunnel\0", + .fill_message_create = netdev_ipip_sit_fill_message_create, + .create_type = NETDEV_CREATE_STACKED, + .is_ready_to_create = netdev_tunnel_is_ready_to_create, + .config_verify = netdev_tunnel_verify, + .iftype = ARPHRD_SIT, +}; + +const NetDevVTable vti_vtable = { + .object_size = sizeof(Tunnel), + .init = netdev_tunnel_init, + .sections = NETDEV_COMMON_SECTIONS "Tunnel\0", + .fill_message_create = netdev_vti_fill_message_create, + .create_type = NETDEV_CREATE_STACKED, + .is_ready_to_create = netdev_tunnel_is_ready_to_create, + .config_verify = netdev_tunnel_verify, + .iftype = ARPHRD_TUNNEL, +}; + +const NetDevVTable vti6_vtable = { + .object_size = sizeof(Tunnel), + .init = netdev_tunnel_init, + .sections = NETDEV_COMMON_SECTIONS "Tunnel\0", + .fill_message_create = netdev_vti_fill_message_create, + .create_type = NETDEV_CREATE_STACKED, + .is_ready_to_create = netdev_tunnel_is_ready_to_create, + .config_verify = netdev_tunnel_verify, + .iftype = ARPHRD_TUNNEL6, +}; + +const NetDevVTable gre_vtable = { + .object_size = sizeof(Tunnel), + .init = netdev_tunnel_init, + .sections = NETDEV_COMMON_SECTIONS "Tunnel\0", + .fill_message_create = netdev_gre_erspan_fill_message_create, + .create_type = NETDEV_CREATE_STACKED, + .is_ready_to_create = netdev_tunnel_is_ready_to_create, + .config_verify = netdev_tunnel_verify, + .iftype = ARPHRD_IPGRE, +}; + +const NetDevVTable gretap_vtable = { + .object_size = sizeof(Tunnel), + .init = netdev_tunnel_init, + .sections = NETDEV_COMMON_SECTIONS "Tunnel\0", + .fill_message_create = netdev_gre_erspan_fill_message_create, + .create_type = NETDEV_CREATE_STACKED, + .is_ready_to_create = netdev_tunnel_is_ready_to_create, + .config_verify = netdev_tunnel_verify, + .iftype = ARPHRD_ETHER, + .generate_mac = true, +}; + +const NetDevVTable ip6gre_vtable = { + .object_size = sizeof(Tunnel), + .init = netdev_tunnel_init, + .sections = NETDEV_COMMON_SECTIONS "Tunnel\0", + .fill_message_create = netdev_ip6gre_fill_message_create, + .create_type = NETDEV_CREATE_STACKED, + .is_ready_to_create = netdev_tunnel_is_ready_to_create, + .config_verify = netdev_tunnel_verify, + .iftype = ARPHRD_IP6GRE, +}; + +const NetDevVTable ip6gretap_vtable = { + .object_size = sizeof(Tunnel), + .init = netdev_tunnel_init, + .sections = NETDEV_COMMON_SECTIONS "Tunnel\0", + .fill_message_create = netdev_ip6gre_fill_message_create, + .create_type = NETDEV_CREATE_STACKED, + .is_ready_to_create = netdev_tunnel_is_ready_to_create, + .config_verify = netdev_tunnel_verify, + .iftype = ARPHRD_ETHER, + .generate_mac = true, +}; + +const NetDevVTable ip6tnl_vtable = { + .object_size = sizeof(Tunnel), + .init = netdev_tunnel_init, + .sections = NETDEV_COMMON_SECTIONS "Tunnel\0", + .fill_message_create = netdev_ip6tnl_fill_message_create, + .create_type = NETDEV_CREATE_STACKED, + .is_ready_to_create = netdev_tunnel_is_ready_to_create, + .config_verify = netdev_tunnel_verify, + .iftype = ARPHRD_TUNNEL6, +}; + +const NetDevVTable erspan_vtable = { + .object_size = sizeof(Tunnel), + .init = netdev_tunnel_init, + .sections = NETDEV_COMMON_SECTIONS "Tunnel\0", + .fill_message_create = netdev_gre_erspan_fill_message_create, + .create_type = NETDEV_CREATE_STACKED, + .is_ready_to_create = netdev_tunnel_is_ready_to_create, + .config_verify = netdev_tunnel_verify, + .iftype = ARPHRD_ETHER, + .generate_mac = true, +}; 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