networkd-netdev-tunnel.c revision 8b43440b7ef4b81c69c31de7ff820dc07a780254
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
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 htonl(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(t->family == AF_INET);
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(t->family == AF_INET);
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(t->family == AF_INET);
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_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 = 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 = 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->remote.in.s_addr == INADDR_ANY) {
log_warning("Tunnel without remote address configured in %s. Ignoring", filename);
return -EINVAL;
}
if (t->family != AF_INET && t->family != AF_INET6) {
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);
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_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 = htonl(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;
}
static void sit_init(NetDev *n) {
Tunnel *t = SIT(n);
assert(n);
assert(t);
t->pmtudisc = true;
}
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;
}
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,
};