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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/* Make sure the net/if.h header is included before any linux/ one */
#include <net/if.h>
#include <linux/fou.h>
#include <netinet/in.h>
#include <linux/ip.h>
#include "conf-parser.h"
#include "fou-tunnel.h"
#include "ip-protocol-list.h"
#include "netlink-util.h"
#include "networkd-manager.h"
#include "parse-util.h"
#include "string-table.h"
#include "string-util.h"
static const char* const fou_encap_type_table[_NETDEV_FOO_OVER_UDP_ENCAP_MAX] = {
[NETDEV_FOO_OVER_UDP_ENCAP_DIRECT] = "FooOverUDP",
[NETDEV_FOO_OVER_UDP_ENCAP_GUE] = "GenericUDPEncapsulation",
};
DEFINE_STRING_TABLE_LOOKUP(fou_encap_type, FooOverUDPEncapType);
DEFINE_CONFIG_PARSE_ENUM(config_parse_fou_encap_type, fou_encap_type, FooOverUDPEncapType);
static int netdev_fill_fou_tunnel_message(NetDev *netdev, sd_netlink_message *m) {
FouTunnel *t = FOU(netdev);
uint8_t encap_type;
int r;
r = sd_netlink_message_append_u16(m, FOU_ATTR_PORT, htobe16(t->port));
if (r < 0)
return r;
if (IN_SET(t->peer_family, AF_INET, AF_INET6)) {
r = sd_netlink_message_append_u16(m, FOU_ATTR_PEER_PORT, htobe16(t->peer_port));
if (r < 0)
return r;
}
switch (t->fou_encap_type) {
case NETDEV_FOO_OVER_UDP_ENCAP_DIRECT:
encap_type = FOU_ENCAP_DIRECT;
break;
case NETDEV_FOO_OVER_UDP_ENCAP_GUE:
encap_type = FOU_ENCAP_GUE;
break;
default:
assert_not_reached();
}
r = sd_netlink_message_append_u8(m, FOU_ATTR_TYPE, encap_type);
if (r < 0)
return r;
r = sd_netlink_message_append_u8(m, FOU_ATTR_AF, AF_INET);
if (r < 0)
return r;
r = sd_netlink_message_append_u8(m, FOU_ATTR_IPPROTO, t->fou_protocol);
if (r < 0)
return r;
if (t->local_family == AF_INET) {
r = sd_netlink_message_append_in_addr(m, FOU_ATTR_LOCAL_V4, &t->local.in);
if (r < 0)
return r;
} else if (t->local_family == AF_INET6) {
r = sd_netlink_message_append_in6_addr(m, FOU_ATTR_LOCAL_V6, &t->local.in6);
if (r < 0)
return r;
}
if (t->peer_family == AF_INET) {
r = sd_netlink_message_append_in_addr(m, FOU_ATTR_PEER_V4, &t->peer.in);
if (r < 0)
return r;
} else if (t->peer_family == AF_INET6){
r = sd_netlink_message_append_in6_addr(m, FOU_ATTR_PEER_V6, &t->peer.in6);
if (r < 0)
return r;
}
return 0;
}
static int netdev_create_fou_tunnel_message(NetDev *netdev, sd_netlink_message **ret) {
_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
int r;
assert(netdev);
assert(netdev->manager);
r = sd_genl_message_new(netdev->manager->genl, FOU_GENL_NAME, FOU_CMD_ADD, &m);
if (r < 0)
return log_netdev_error_errno(netdev, r, "Could not allocate netlink message: %m");
r = netdev_fill_fou_tunnel_message(netdev, m);
if (r < 0)
return log_netdev_error_errno(netdev, r, "Could not create netlink message: %m");
*ret = TAKE_PTR(m);
return 0;
}
static int fou_tunnel_create_handler(sd_netlink *rtnl, sd_netlink_message *m, NetDev *netdev) {
int r;
assert(netdev);
assert(netdev->state != _NETDEV_STATE_INVALID);
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_enter_failed(netdev);
return 1;
}
log_netdev_debug(netdev, "FooOverUDP tunnel is created");
return 1;
}
static int netdev_fou_tunnel_create(NetDev *netdev) {
_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
int r;
assert(FOU(netdev));
if (!netdev_is_managed(netdev))
return 0; /* Already detached, due to e.g. reloading .netdev files. */
r = netdev_create_fou_tunnel_message(netdev, &m);
if (r < 0)
return r;
r = netlink_call_async(netdev->manager->genl, NULL, m, fou_tunnel_create_handler,
netdev_destroy_callback, netdev);
if (r < 0)
return log_netdev_error_errno(netdev, r, "Failed to create FooOverUDP tunnel: %m");
netdev_ref(netdev);
return 0;
}
int config_parse_fou_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) {
union in_addr_union *addr = ASSERT_PTR(data);
FouTunnel *t = userdata;
int r, *f;
assert(filename);
assert(lvalue);
assert(rvalue);
if (streq(lvalue, "Local"))
f = &t->local_family;
else
f = &t->peer_family;
r = in_addr_from_string_auto(rvalue, f, addr);
if (r < 0)
log_syntax(unit, LOG_WARNING, filename, line, r,
"FooOverUDP tunnel '%s' address is invalid, ignoring assignment: %s",
lvalue, rvalue);
return 0;
}
static int netdev_fou_tunnel_verify(NetDev *netdev, const char *filename) {
assert(filename);
FouTunnel *t = FOU(netdev);
switch (t->fou_encap_type) {
case NETDEV_FOO_OVER_UDP_ENCAP_DIRECT:
if (t->fou_protocol <= 0)
return log_netdev_error_errno(netdev, SYNTHETIC_ERRNO(EINVAL),
"FooOverUDP protocol not configured in %s. Rejecting configuration.",
filename);
break;
case NETDEV_FOO_OVER_UDP_ENCAP_GUE:
if (t->fou_protocol > 0)
return log_netdev_error_errno(netdev, SYNTHETIC_ERRNO(EINVAL),
"FooOverUDP GUE can't be set with protocol configured in %s. Rejecting configuration.",
filename);
break;
default:
assert_not_reached();
}
if (t->peer_family == AF_UNSPEC && t->peer_port > 0)
return log_netdev_error_errno(netdev, SYNTHETIC_ERRNO(EINVAL),
"FooOverUDP peer port is set but peer address not configured in %s. Rejecting configuration.",
filename);
else if (t->peer_family != AF_UNSPEC && t->peer_port == 0)
return log_netdev_error_errno(netdev, SYNTHETIC_ERRNO(EINVAL),
"FooOverUDP peer port not set but peer address is configured in %s. Rejecting configuration.",
filename);
return 0;
}
static void fou_tunnel_init(NetDev *netdev) {
FouTunnel *t = FOU(netdev);
t->fou_encap_type = NETDEV_FOO_OVER_UDP_ENCAP_DIRECT;
}
const NetDevVTable foutnl_vtable = {
.object_size = sizeof(FouTunnel),
.init = fou_tunnel_init,
.sections = NETDEV_COMMON_SECTIONS "FooOverUDP\0",
.create = netdev_fou_tunnel_create,
.create_type = NETDEV_CREATE_INDEPENDENT,
.config_verify = netdev_fou_tunnel_verify,
};
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