/*** This file is part of systemd. Copyright 2014 Susant Sahani systemd is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. systemd is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with systemd; If not, see <http://www.gnu.org/licenses/>. ***/ #include <arpa/inet.h> #include <net/if.h> #include <linux/ip.h> #include <linux/if_tunnel.h> #include <linux/ip6_tunnel.h> #include "sd-netlink.h" #include "conf-parser.h" #include "missing.h" #include "networkd-link.h" #include "networkd-netdev-tunnel.h" #include "parse-util.h" #include "string-table.h" #include "string-util.h" #include "util.h" #define DEFAULT_TNL_HOP_LIMIT 64 #define IP6_FLOWINFO_FLOWLABEL htobe32(0x000FFFFF) 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"); static int netdev_ipip_fill_message_create(NetDev *netdev, Link *link, sd_netlink_message *m) { Tunnel *t = IPIP(netdev); int r; assert(netdev); assert(link); assert(m); assert(t); assert(IN_SET(t->family, AF_INET, AF_UNSPEC)); r = sd_netlink_message_append_u32(m, IFLA_IPTUN_LINK, link->ifindex); if (r < 0) return log_netdev_error_errno(netdev, r, "Could not append IFLA_IPTUN_LINK attribute: %m"); r = sd_netlink_message_append_in_addr(m, IFLA_IPTUN_LOCAL, &t->local.in); if (r < 0) return log_netdev_error_errno(netdev, r, "Could not append IFLA_IPTUN_LOCAL attribute: %m"); r = sd_netlink_message_append_in_addr(m, IFLA_IPTUN_REMOTE, &t->remote.in); if (r < 0) return log_netdev_error_errno(netdev, r, "Could not append IFLA_IPTUN_REMOTE attribute: %m"); r = sd_netlink_message_append_u8(m, IFLA_IPTUN_TTL, t->ttl); if (r < 0) return log_netdev_error_errno(netdev, r, "Could not append IFLA_IPTUN_TTL attribute: %m"); r = sd_netlink_message_append_u8(m, IFLA_IPTUN_PMTUDISC, t->pmtudisc); if (r < 0) return log_netdev_error_errno(netdev, r, "Could not append IFLA_IPTUN_PMTUDISC attribute: %m"); return r; } static int netdev_sit_fill_message_create(NetDev *netdev, Link *link, sd_netlink_message *m) { Tunnel *t = SIT(netdev); int r; assert(netdev); assert(link); assert(m); assert(t); assert(IN_SET(t->family, AF_INET, AF_UNSPEC)); r = sd_netlink_message_append_u32(m, IFLA_IPTUN_LINK, link->ifindex); if (r < 0) return log_netdev_error_errno(netdev, r, "Could not append IFLA_IPTUN_LINK attribute: %m"); r = sd_netlink_message_append_in_addr(m, IFLA_IPTUN_LOCAL, &t->local.in); if (r < 0) return log_netdev_error_errno(netdev, r, "Could not append IFLA_IPTUN_LOCAL attribute: %m"); r = sd_netlink_message_append_in_addr(m, IFLA_IPTUN_REMOTE, &t->remote.in); if (r < 0) return log_netdev_error_errno(netdev, r, "Could not append IFLA_IPTUN_REMOTE attribute: %m"); r = sd_netlink_message_append_u8(m, IFLA_IPTUN_TTL, t->ttl); if (r < 0) return log_netdev_error_errno(netdev, r, "Could not append IFLA_IPTUN_TTL attribute: %m"); r = sd_netlink_message_append_u8(m, IFLA_IPTUN_PMTUDISC, t->pmtudisc); if (r < 0) return log_netdev_error_errno(netdev, r, "Could not append IFLA_IPTUN_PMTUDISC attribute: %m"); return r; } static int netdev_gre_fill_message_create(NetDev *netdev, Link *link, sd_netlink_message *m) { Tunnel *t; int r; assert(netdev); if (netdev->kind == NETDEV_KIND_GRE) t = GRE(netdev); else t = GRETAP(netdev); assert(t); assert(IN_SET(t->family, AF_INET, AF_UNSPEC)); assert(link); assert(m); r = sd_netlink_message_append_u32(m, IFLA_GRE_LINK, link->ifindex); if (r < 0) return log_netdev_error_errno(netdev, r, "Could not append IFLA_GRE_LINK attribute: %m"); r = sd_netlink_message_append_in_addr(m, IFLA_GRE_LOCAL, &t->local.in); if (r < 0) return log_netdev_error_errno(netdev, r, "Could not append IFLA_GRE_LOCAL attribute: %m"); r = sd_netlink_message_append_in_addr(m, IFLA_GRE_REMOTE, &t->remote.in); if (r < 0) log_netdev_error_errno(netdev, r, "Could not append IFLA_GRE_REMOTE attribute: %m"); r = sd_netlink_message_append_u8(m, IFLA_GRE_TTL, t->ttl); if (r < 0) return log_netdev_error_errno(netdev, r, "Could not append IFLA_GRE_TTL attribute: %m"); r = sd_netlink_message_append_u8(m, IFLA_GRE_TOS, t->tos); if (r < 0) log_netdev_error_errno(netdev, r, "Could not append IFLA_GRE_TOS attribute: %m"); r = sd_netlink_message_append_u8(m, IFLA_GRE_PMTUDISC, t->pmtudisc); if (r < 0) return log_netdev_error_errno(netdev, r, "Could not append IFLA_GRE_PMTUDISC attribute: %m"); return r; } static int netdev_ip6gre_fill_message_create(NetDev *netdev, Link *link, sd_netlink_message *m) { Tunnel *t; int r; assert(netdev); if (netdev->kind == NETDEV_KIND_IP6GRE) t = IP6GRE(netdev); else t = IP6GRETAP(netdev); assert(t); assert(t->family == AF_INET6); assert(link); assert(m); r = sd_netlink_message_append_u32(m, IFLA_GRE_LINK, link->ifindex); if (r < 0) return log_netdev_error_errno(netdev, r, "Could not append IFLA_GRE_LINK attribute: %m"); r = sd_netlink_message_append_in6_addr(m, IFLA_GRE_LOCAL, &t->local.in6); if (r < 0) return log_netdev_error_errno(netdev, r, "Could not append IFLA_GRE_LOCAL attribute: %m"); r = sd_netlink_message_append_in6_addr(m, IFLA_GRE_REMOTE, &t->remote.in6); if (r < 0) return log_netdev_error_errno(netdev, r, "Could not append IFLA_GRE_REMOTE attribute: %m"); r = sd_netlink_message_append_u8(m, IFLA_GRE_TTL, t->ttl); if (r < 0) return log_netdev_error_errno(netdev, r, "Could not append IFLA_GRE_TTL attribute: %m"); 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 log_netdev_error_errno(netdev, r, "Could not append IFLA_GRE_FLOWINFO attribute: %m"); } r = sd_netlink_message_append_u32(m, IFLA_GRE_FLAGS, t->flags); if (r < 0) return log_netdev_error_errno(netdev, r, "Could not append IFLA_GRE_FLAGS attribute: %m"); return r; } static int netdev_vti_fill_message_key(NetDev *netdev, Link *link, sd_netlink_message *m) { Tunnel *t = VTI(netdev); uint32_t ikey, okey; int r; assert(link); assert(m); assert(t); 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 log_netdev_error_errno(netdev, r, "Could not append IFLA_VTI_IKEY attribute: %m"); r = sd_netlink_message_append_u32(m, IFLA_VTI_OKEY, okey); if (r < 0) return log_netdev_error_errno(netdev, r, "Could not append IFLA_VTI_OKEY attribute: %m"); return 0; } static int netdev_vti_fill_message_create(NetDev *netdev, Link *link, sd_netlink_message *m) { Tunnel *t = VTI(netdev); int r; assert(netdev); assert(link); assert(m); assert(t); assert(t->family == AF_INET); r = sd_netlink_message_append_u32(m, IFLA_VTI_LINK, link->ifindex); if (r < 0) return log_netdev_error_errno(netdev, r, "Could not append IFLA_IPTUN_LINK attribute: %m"); r = netdev_vti_fill_message_key(netdev, link, m); if (r < 0) return r; r = sd_netlink_message_append_in_addr(m, IFLA_VTI_LOCAL, &t->local.in); if (r < 0) return log_netdev_error_errno(netdev, r, "Could not append IFLA_IPTUN_LOCAL attribute: %m"); r = sd_netlink_message_append_in_addr(m, IFLA_VTI_REMOTE, &t->remote.in); if (r < 0) return log_netdev_error_errno(netdev, r, "Could not append IFLA_IPTUN_REMOTE attribute: %m"); return r; } static int netdev_vti6_fill_message_create(NetDev *netdev, Link *link, sd_netlink_message *m) { Tunnel *t = VTI6(netdev); int r; assert(netdev); assert(link); assert(m); assert(t); assert(t->family == AF_INET6); r = sd_netlink_message_append_u32(m, IFLA_VTI_LINK, link->ifindex); if (r < 0) return log_netdev_error_errno(netdev, r, "Could not append IFLA_IPTUN_LINK attribute: %m"); r = netdev_vti_fill_message_key(netdev, link, m); if (r < 0) return r; r = sd_netlink_message_append_in6_addr(m, IFLA_VTI_LOCAL, &t->local.in6); if (r < 0) return log_netdev_error_errno(netdev, r, "Could not append IFLA_IPTUN_LOCAL attribute: %m"); r = sd_netlink_message_append_in6_addr(m, IFLA_VTI_REMOTE, &t->remote.in6); if (r < 0) return log_netdev_error_errno(netdev, r, "Could not append IFLA_IPTUN_REMOTE attribute: %m"); return r; } static int netdev_ip6tnl_fill_message_create(NetDev *netdev, Link *link, sd_netlink_message *m) { Tunnel *t = IP6TNL(netdev); uint8_t proto; int r; assert(netdev); assert(link); assert(m); assert(t); assert(t->family == AF_INET6); r = sd_netlink_message_append_u32(m, IFLA_IPTUN_LINK, link->ifindex); if (r < 0) return log_netdev_error_errno(netdev, r, "Could not append IFLA_IPTUN_LINK attribute: %m"); r = sd_netlink_message_append_in6_addr(m, IFLA_IPTUN_LOCAL, &t->local.in6); if (r < 0) return log_netdev_error_errno(netdev, r, "Could not append IFLA_IPTUN_LOCAL attribute: %m"); r = sd_netlink_message_append_in6_addr(m, IFLA_IPTUN_REMOTE, &t->remote.in6); if (r < 0) return log_netdev_error_errno(netdev, r, "Could not append IFLA_IPTUN_REMOTE attribute: %m"); r = sd_netlink_message_append_u8(m, IFLA_IPTUN_TTL, t->ttl); if (r < 0) return log_netdev_error_errno(netdev, r, "Could not append IFLA_IPTUN_TTL attribute: %m"); 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 log_netdev_error_errno(netdev, r, "Could not append IFLA_IPTUN_FLOWINFO attribute: %m"); } if (t->copy_dscp) t->flags |= IP6_TNL_F_RCV_DSCP_COPY; if (t->encap_limit != IPV6_DEFAULT_TNL_ENCAP_LIMIT) { r = sd_netlink_message_append_u8(m, IFLA_IPTUN_ENCAP_LIMIT, t->encap_limit); if (r < 0) return log_netdev_error_errno(netdev, r, "Could not append IFLA_IPTUN_ENCAP_LIMIT attribute: %m"); } r = sd_netlink_message_append_u32(m, IFLA_IPTUN_FLAGS, t->flags); if (r < 0) return log_netdev_error_errno(netdev, r, "Could not append IFLA_IPTUN_FLAGS attribute: %m"); 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 log_netdev_error_errno(netdev, r, "Could not append IFLA_IPTUN_MODE attribute: %m"); return r; } static int netdev_tunnel_verify(NetDev *netdev, const char *filename) { Tunnel *t = NULL; assert(netdev); assert(filename); switch (netdev->kind) { case NETDEV_KIND_IPIP: t = IPIP(netdev); break; case NETDEV_KIND_SIT: t = SIT(netdev); break; case NETDEV_KIND_GRE: t = GRE(netdev); break; case NETDEV_KIND_GRETAP: t = GRETAP(netdev); break; case NETDEV_KIND_IP6GRE: t = IP6GRE(netdev); break; case NETDEV_KIND_IP6GRETAP: t = IP6GRETAP(netdev); break; case NETDEV_KIND_VTI: t = VTI(netdev); break; case NETDEV_KIND_VTI6: t = VTI6(netdev); break; case NETDEV_KIND_IP6TNL: t = IP6TNL(netdev); break; default: assert_not_reached("Invalid tunnel kind"); } assert(t); if (t->family != AF_INET && t->family != AF_INET6 && t->family != 0) { log_warning("Tunnel with invalid address family configured in %s. Ignoring", filename); return -EINVAL; } if (netdev->kind == NETDEV_KIND_IP6TNL) { if (t->ip6tnl_mode == _NETDEV_IP6_TNL_MODE_INVALID) { log_warning("IP6 Tunnel without mode configured in %s. Ignoring", filename); return -EINVAL; } } return 0; } int config_parse_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) { Tunnel *t = userdata; union in_addr_union *addr = data, buffer; int r, f; assert(filename); assert(lvalue); assert(rvalue); assert(data); if (streq(rvalue, "any")) { t->family = 0; return 0; } else { r = in_addr_from_string_auto(rvalue, &f, &buffer); if (r < 0) { log_syntax(unit, LOG_ERR, filename, line, r, "Tunnel address is invalid, ignoring assignment: %s", rvalue); return 0; } if (t->family != AF_UNSPEC && t->family != f) { log_syntax(unit, LOG_ERR, filename, line, 0, "Tunnel addresses incompatible, ignoring assignment: %s", rvalue); return 0; } } t->family = f; *addr = 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) { union in_addr_union buffer; Tunnel *t = userdata; uint32_t k; int r; assert(filename); assert(lvalue); assert(rvalue); assert(data); r = in_addr_from_string(AF_INET, rvalue, &buffer); if (r < 0) { r = safe_atou32(rvalue, &k); if (r < 0) { log_syntax(unit, LOG_ERR, filename, line, 0, "Failed to parse tunnel key ignoring assignment: %s", rvalue); return 0; } } else k = be32toh(buffer.in.s_addr); if (streq(lvalue, "Key")) t->key = k; else if (streq(lvalue, "InputKey")) t->ikey = k; else t->okey = 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) { IPv6FlowLabel *ipv6_flowlabel = data; Tunnel *t = userdata; int k = 0; int r; assert(filename); assert(lvalue); assert(rvalue); assert(ipv6_flowlabel); if (streq(rvalue, "inherit")) { *ipv6_flowlabel = IP6_FLOWINFO_FLOWLABEL; t->flags |= IP6_TNL_F_USE_ORIG_FLOWLABEL; } else { r = config_parse_int(unit, filename, line, section, section_line, lvalue, ltype, rvalue, &k, userdata); if (r < 0) return r; if (k > 0xFFFFF) log_syntax(unit, LOG_ERR, filename, line, 0, "Failed to parse IPv6 flowlabel option, ignoring: %s", rvalue); else { *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 = userdata; int k = 0; int r; assert(filename); assert(lvalue); assert(rvalue); if (streq(rvalue, "none")) t->flags |= IP6_TNL_F_IGN_ENCAP_LIMIT; else { r = safe_atoi(rvalue, &k); if (r < 0) { log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse Tunnel Encapsulation Limit option, ignoring: %s", rvalue); return 0; } if (k > 255 || k < 0) log_syntax(unit, LOG_ERR, filename, line, 0, "Invalid Tunnel Encapsulation value, ignoring: %d", k); else { t->encap_limit = k; t->flags &= ~IP6_TNL_F_IGN_ENCAP_LIMIT; } } return 0; } static void ipip_init(NetDev *n) { Tunnel *t = IPIP(n); assert(n); assert(t); t->pmtudisc = true; t->family = AF_UNSPEC; } static void sit_init(NetDev *n) { Tunnel *t = SIT(n); assert(n); assert(t); t->pmtudisc = true; t->family = AF_UNSPEC; } static void vti_init(NetDev *n) { Tunnel *t; assert(n); if (n->kind == NETDEV_KIND_VTI) t = VTI(n); else t = VTI6(n); assert(t); t->pmtudisc = true; } static void gre_init(NetDev *n) { Tunnel *t; assert(n); if (n->kind == NETDEV_KIND_GRE) t = GRE(n); else t = GRETAP(n); assert(t); t->pmtudisc = true; t->family = AF_UNSPEC; } static void ip6gre_init(NetDev *n) { Tunnel *t; assert(n); if (n->kind == NETDEV_KIND_IP6GRE) t = IP6GRE(n); else t = IP6GRETAP(n); assert(t); t->ttl = DEFAULT_TNL_HOP_LIMIT; } static void ip6tnl_init(NetDev *n) { Tunnel *t = IP6TNL(n); assert(n); assert(t); t->ttl = DEFAULT_TNL_HOP_LIMIT; t->encap_limit = IPV6_DEFAULT_TNL_ENCAP_LIMIT; t->ip6tnl_mode = _NETDEV_IP6_TNL_MODE_INVALID; t->ipv6_flowlabel = _NETDEV_IPV6_FLOWLABEL_INVALID; } const NetDevVTable ipip_vtable = { .object_size = sizeof(Tunnel), .init = ipip_init, .sections = "Match\0NetDev\0Tunnel\0", .fill_message_create = netdev_ipip_fill_message_create, .create_type = NETDEV_CREATE_STACKED, .config_verify = netdev_tunnel_verify, }; const NetDevVTable sit_vtable = { .object_size = sizeof(Tunnel), .init = sit_init, .sections = "Match\0NetDev\0Tunnel\0", .fill_message_create = netdev_sit_fill_message_create, .create_type = NETDEV_CREATE_STACKED, .config_verify = netdev_tunnel_verify, }; const NetDevVTable vti_vtable = { .object_size = sizeof(Tunnel), .init = vti_init, .sections = "Match\0NetDev\0Tunnel\0", .fill_message_create = netdev_vti_fill_message_create, .create_type = NETDEV_CREATE_STACKED, .config_verify = netdev_tunnel_verify, }; const NetDevVTable vti6_vtable = { .object_size = sizeof(Tunnel), .init = vti_init, .sections = "Match\0NetDev\0Tunnel\0", .fill_message_create = netdev_vti6_fill_message_create, .create_type = NETDEV_CREATE_STACKED, .config_verify = netdev_tunnel_verify, }; const NetDevVTable gre_vtable = { .object_size = sizeof(Tunnel), .init = gre_init, .sections = "Match\0NetDev\0Tunnel\0", .fill_message_create = netdev_gre_fill_message_create, .create_type = NETDEV_CREATE_STACKED, .config_verify = netdev_tunnel_verify, }; const NetDevVTable gretap_vtable = { .object_size = sizeof(Tunnel), .init = gre_init, .sections = "Match\0NetDev\0Tunnel\0", .fill_message_create = netdev_gre_fill_message_create, .create_type = NETDEV_CREATE_STACKED, .config_verify = netdev_tunnel_verify, }; const NetDevVTable ip6gre_vtable = { .object_size = sizeof(Tunnel), .init = ip6gre_init, .sections = "Match\0NetDev\0Tunnel\0", .fill_message_create = netdev_ip6gre_fill_message_create, .create_type = NETDEV_CREATE_STACKED, .config_verify = netdev_tunnel_verify, }; const NetDevVTable ip6gretap_vtable = { .object_size = sizeof(Tunnel), .init = ip6gre_init, .sections = "Match\0NetDev\0Tunnel\0", .fill_message_create = netdev_ip6gre_fill_message_create, .create_type = NETDEV_CREATE_STACKED, .config_verify = netdev_tunnel_verify, }; const NetDevVTable ip6tnl_vtable = { .object_size = sizeof(Tunnel), .init = ip6tnl_init, .sections = "Match\0NetDev\0Tunnel\0", .fill_message_create = netdev_ip6tnl_fill_message_create, .create_type = NETDEV_CREATE_STACKED, .config_verify = netdev_tunnel_verify, };