networkd-netdev.c revision 6235b3def8f58afe5777f1f5b4e7951f9396c32c
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2013 Tom Gundersen <teg@jklm.no>
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 <net/if.h>
#include "networkd.h"
#include "network-internal.h"
#include "path-util.h"
#include "conf-files.h"
#include "conf-parser.h"
#include "list.h"
#include "siphash24.h"
static const char* const netdev_kind_table[_NETDEV_KIND_MAX] = {
[NETDEV_KIND_BRIDGE] = "bridge",
[NETDEV_KIND_BOND] = "bond",
[NETDEV_KIND_VLAN] = "vlan",
[NETDEV_KIND_MACVLAN] = "macvlan",
[NETDEV_KIND_VXLAN] = "vxlan",
[NETDEV_KIND_IPIP] = "ipip",
[NETDEV_KIND_GRE] = "gre",
[NETDEV_KIND_SIT] = "sit",
[NETDEV_KIND_VETH] = "veth",
[NETDEV_KIND_VTI] = "vti",
[NETDEV_KIND_DUMMY] = "dummy",
[NETDEV_KIND_TUN] = "tun",
[NETDEV_KIND_TAP] = "tap",
};
DEFINE_STRING_TABLE_LOOKUP(netdev_kind, NetDevKind);
DEFINE_CONFIG_PARSE_ENUM(config_parse_netdev_kind, netdev_kind, NetDevKind, "Failed to parse netdev kind");
static void netdev_cancel_callbacks(NetDev *netdev) {
_cleanup_rtnl_message_unref_ sd_rtnl_message *m = NULL;
netdev_join_callback *callback;
if (!netdev)
return;
rtnl_message_new_synthetic_error(-ENODEV, 0, &m);
while ((callback = netdev->callbacks)) {
if (m) {
assert(callback->link);
assert(callback->callback);
assert(netdev->manager);
assert(netdev->manager->rtnl);
callback->callback(netdev->manager->rtnl, m, link);
}
LIST_REMOVE(callbacks, netdev->callbacks, callback);
free(callback);
}
}
static void netdev_free(NetDev *netdev) {
if (!netdev)
return;
netdev_cancel_callbacks(netdev);
if (netdev->ifname)
hashmap_remove(netdev->manager->netdevs, netdev->ifname);
free(netdev->filename);
free(netdev->description);
free(netdev->ifname);
free(netdev->ifname_peer);
free(netdev->mac);
free(netdev->mac_peer);
free(netdev->user_name);
free(netdev->group_name);
condition_free_list(netdev->match_host);
condition_free_list(netdev->match_virt);
condition_free_list(netdev->match_kernel);
condition_free_list(netdev->match_arch);
free(netdev);
}
NetDev *netdev_unref(NetDev *netdev) {
if (netdev && (-- netdev->n_ref <= 0))
netdev_free(netdev);
return NULL;
}
NetDev *netdev_ref(NetDev *netdev) {
if (netdev)
assert_se(++ netdev->n_ref >= 2);
return netdev;
}
void netdev_drop(NetDev *netdev) {
if (!netdev || netdev->state == NETDEV_STATE_LINGER)
return;
netdev->state = NETDEV_STATE_LINGER;
log_debug_netdev(netdev, "netdev removed");
netdev_cancel_callbacks(netdev);
netdev_unref(netdev);
return;
}
int netdev_get(Manager *manager, const char *name, NetDev **ret) {
NetDev *netdev;
assert(manager);
assert(name);
assert(ret);
netdev = hashmap_get(manager->netdevs, name);
if (!netdev) {
*ret = NULL;
return -ENOENT;
}
*ret = netdev;
return 0;
}
static int netdev_enter_failed(NetDev *netdev) {
netdev->state = NETDEV_STATE_FAILED;
return 0;
}
static int netdev_enslave_ready(NetDev *netdev, Link* link, sd_rtnl_message_handler_t callback) {
_cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL;
int r;
assert(netdev);
assert(netdev->state == NETDEV_STATE_READY);
assert(netdev->manager);
assert(netdev->manager->rtnl);
assert(IN_SET(netdev->kind, NETDEV_KIND_BRIDGE, NETDEV_KIND_BOND));
assert(link);
assert(callback);
r = sd_rtnl_message_new_link(netdev->manager->rtnl, &req,
RTM_SETLINK, link->ifindex);
if (r < 0) {
log_error_netdev(netdev,
"Could not allocate RTM_SETLINK message: %s",
strerror(-r));
return r;
}
r = sd_rtnl_message_append_u32(req, IFLA_MASTER, netdev->ifindex);
if (r < 0) {
log_error_netdev(netdev,
"Could not append IFLA_MASTER attribute: %s",
strerror(-r));
return r;
}
r = sd_rtnl_call_async(netdev->manager->rtnl, req, callback, link, 0, NULL);
if (r < 0) {
log_error_netdev(netdev,
"Could not send rtnetlink message: %s",
strerror(-r));
return r;
}
link_ref(link);
log_debug_netdev(netdev, "enslaving link '%s'", link->ifname);
return 0;
}
static int netdev_enter_ready(NetDev *netdev) {
netdev_join_callback *callback, *callback_next;
int r;
assert(netdev);
assert(netdev->ifname);
if (netdev->state != NETDEV_STATE_CREATING)
return 0;
netdev->state = NETDEV_STATE_READY;
log_info_netdev(netdev, "netdev ready");
LIST_FOREACH_SAFE(callbacks, callback, callback_next, netdev->callbacks) {
/* enslave the links that were attempted to be enslaved before the
* link was ready */
r = netdev_enslave_ready(netdev, callback->link, callback->callback);
if (r < 0)
return r;
LIST_REMOVE(callbacks, netdev->callbacks, callback);
link_unref(callback->link);
free(callback);
}
return 0;
}
/* callback for netdev's created without a backing Link */
static int netdev_create_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
_cleanup_netdev_unref_ NetDev *netdev = userdata;
int r;
assert(netdev->state != _NETDEV_STATE_INVALID);
r = sd_rtnl_message_get_errno(m);
if (r == -EEXIST)
log_debug_netdev(netdev, "netdev exists, using existing");
else if (r < 0) {
log_warning_netdev(netdev, "netdev could not be created: %s", strerror(-r));
netdev_drop(netdev);
return 1;
}
return 1;
}
static int netdev_enslave(NetDev *netdev, Link *link, sd_rtnl_message_handler_t callback) {
int r;
assert(netdev);
assert(IN_SET(netdev->kind, NETDEV_KIND_BRIDGE, NETDEV_KIND_BOND));
if (netdev->state == NETDEV_STATE_READY) {
r = netdev_enslave_ready(netdev, link, callback);
if (r < 0)
return r;
} else {
/* the netdev is not yet read, save this request for when it is*/
netdev_join_callback *cb;
cb = new0(netdev_join_callback, 1);
if (!cb)
return log_oom();
cb->callback = callback;
cb->link = link;
link_ref(link);
LIST_PREPEND(callbacks, netdev->callbacks, cb);
}
return 0;
}
/* the callback must be called, possibly after a timeout, as otherwise the Link will hang */
int netdev_join(NetDev *netdev, Link *link, sd_rtnl_message_handler_t callback) {
assert(netdev);
switch(netdev->kind) {
case NETDEV_KIND_VLAN:
return netdev_create_vlan(netdev, link, callback);
case NETDEV_KIND_MACVLAN:
return netdev_create_macvlan(netdev, link, callback);
case NETDEV_KIND_VXLAN:
return netdev_create_vxlan(netdev, link, callback);
case NETDEV_KIND_IPIP:
case NETDEV_KIND_GRE:
case NETDEV_KIND_SIT:
case NETDEV_KIND_VTI:
return netdev_create_tunnel(netdev, link, callback);
case NETDEV_KIND_BRIDGE:
case NETDEV_KIND_BOND:
return netdev_enslave(netdev, link, callback);
default:
assert_not_reached("Enslaving by invalid netdev kind");
}
return 0;
}
int netdev_set_ifindex(NetDev *netdev, sd_rtnl_message *message) {
uint16_t type;
const char *kind;
char *received_kind;
char *received_name;
int r, ifindex;
assert(netdev);
assert(message);
r = sd_rtnl_message_get_type(message, &type);
if (r < 0) {
log_error_netdev(netdev, "Could not get rtnl message type");
return r;
}
if (type != RTM_NEWLINK) {
log_error_netdev(netdev, "Can not set ifindex from unexpected rtnl message type");
return -EINVAL;
}
r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
if (r < 0) {
log_error_netdev(netdev, "Could not get ifindex: %s", strerror(-r));
netdev_enter_failed(netdev);
return r;
} else if (ifindex <= 0) {
log_error_netdev(netdev, "Got invalid ifindex: %d", ifindex);
netdev_enter_failed(netdev);
return r;
}
if (netdev->ifindex > 0) {
if (netdev->ifindex != ifindex) {
log_error_netdev(netdev, "Could not set ifindex to %d, already set to %d",
ifindex, netdev->ifindex);
netdev_enter_failed(netdev);
return -EEXIST;
} else
/* ifindex already set to the same for this netdev */
return 0;
}
r = sd_rtnl_message_read_string(message, IFLA_IFNAME, &received_name);
if (r < 0) {
log_error_netdev(netdev, "Could not get IFNAME");
return r;
}
if (!streq(netdev->ifname, received_name)) {
log_error_netdev(netdev, "Received newlink with wrong IFNAME %s",
received_name);
netdev_enter_failed(netdev);
return r;
}
r = sd_rtnl_message_enter_container(message, IFLA_LINKINFO);
if (r < 0) {
log_error_netdev(netdev, "Could not get LINKINFO");
return r;
}
r = sd_rtnl_message_read_string(message, IFLA_INFO_KIND, &received_kind);
if (r < 0) {
log_error_netdev(netdev, "Could not get KIND");
return r;
}
r = sd_rtnl_message_exit_container(message);
if (r < 0) {
log_error_netdev(netdev, "Could not exit container");
return r;
}
if (netdev->kind == NETDEV_KIND_TAP)
/* the kernel does not distinguish between tun and tap */
kind = "tun";
else {
kind = netdev_kind_to_string(netdev->kind);
if (!kind) {
log_error_netdev(netdev, "Could not get kind");
netdev_enter_failed(netdev);
return -EINVAL;
}
}
if (!streq(kind, received_kind)) {
log_error_netdev(netdev,
"Received newlink with wrong KIND %s, "
"expected %s", received_kind, kind);
netdev_enter_failed(netdev);
return r;
}
netdev->ifindex = ifindex;
log_debug_netdev(netdev, "netdev has index %d", netdev->ifindex);
netdev_enter_ready(netdev);
return 0;
}
#define HASH_KEY SD_ID128_MAKE(52,e1,45,bd,00,6f,29,96,21,c6,30,6d,83,71,04,48)
static int netdev_get_mac(const char *ifname, struct ether_addr **ret) {
_cleanup_free_ struct ether_addr *mac = NULL;
uint8_t result[8];
size_t l, sz;
uint8_t *v;
int r;
assert(ifname);
assert(ret);
mac = new0(struct ether_addr, 1);
if (!mac)
return -ENOMEM;
l = strlen(ifname);
sz = sizeof(sd_id128_t) + l;
v = alloca(sz);
/* fetch some persistent data unique to the machine */
r = sd_id128_get_machine((sd_id128_t*) v);
if (r < 0)
return r;
/* combine with some data unique (on this machine) to this
* netdev */
memcpy(v + sizeof(sd_id128_t), ifname, l);
/* Let's hash the host machine ID plus the container name. We
* use a fixed, but originally randomly created hash key here. */
siphash24(result, v, sz, HASH_KEY.bytes);
assert_cc(ETH_ALEN <= sizeof(result));
memcpy(mac->ether_addr_octet, result, ETH_ALEN);
/* see eth_random_addr in the kernel */
mac->ether_addr_octet[0] &= 0xfe; /* clear multicast bit */
mac->ether_addr_octet[0] |= 0x02; /* set local assignment bit (IEEE802) */
*ret = mac;
mac = NULL;
return 0;
}
static int netdev_load_one(Manager *manager, const char *filename) {
_cleanup_netdev_unref_ NetDev *netdev = NULL;
_cleanup_fclose_ FILE *file = NULL;
int r;
assert(manager);
assert(filename);
if (null_or_empty_path(filename)) {
log_debug("skipping empty file: %s", filename);
return 0;
}
file = fopen(filename, "re");
if (!file) {
if (errno == ENOENT)
return 0;
else
return -errno;
}
netdev = new0(NetDev, 1);
if (!netdev)
return log_oom();
netdev->n_ref = 1;
netdev->manager = manager;
netdev->state = _NETDEV_STATE_INVALID;
netdev->kind = _NETDEV_KIND_INVALID;
netdev->macvlan_mode = _NETDEV_MACVLAN_MODE_INVALID;
netdev->bond_mode = _NETDEV_BOND_MODE_INVALID;
netdev->vlanid = VLANID_MAX + 1;
netdev->vxlanid = VXLAN_VID_MAX + 1;
netdev->tunnel_pmtudisc = true;
netdev->learning = true;
r = config_parse(NULL, filename, file,
"Match\0NetDev\0VLAN\0MACVLAN\0VXLAN\0Tunnel\0Peer\0Tun\0Tap\0Bond\0",
config_item_perf_lookup, (void*) network_netdev_gperf_lookup,
false, false, netdev);
if (r < 0) {
log_warning("Could not parse config file %s: %s", filename, strerror(-r));
return r;
}
switch (netdev->kind) {
case _NETDEV_KIND_INVALID:
log_warning("NetDev without Kind configured in %s. Ignoring", filename);
return 0;
case NETDEV_KIND_VLAN:
if (netdev->vlanid > VLANID_MAX) {
log_warning("VLAN without valid Id configured in %s. Ignoring", filename);
return 0;
}
break;
case NETDEV_KIND_VXLAN:
if (netdev->vxlanid > VXLAN_VID_MAX) {
log_warning("VXLAN without valid Id configured in %s. Ignoring", filename);
return 0;
}
break;
case NETDEV_KIND_IPIP:
case NETDEV_KIND_GRE:
case NETDEV_KIND_SIT:
case NETDEV_KIND_VTI:
if (netdev->local.in.s_addr == INADDR_ANY) {
log_warning("Tunnel without local address configured in %s. Ignoring", filename);
return 0;
}
if (netdev->remote.in.s_addr == INADDR_ANY) {
log_warning("Tunnel without remote address configured in %s. Ignoring", filename);
return 0;
}
if (netdev->family != AF_INET) {
log_warning("Tunnel with invalid address family configured in %s. Ignoring", filename);
return 0;
}
break;
default:
break;
}
if (!netdev->ifname) {
log_warning("NetDev without Name configured in %s. Ignoring", filename);
return 0;
}
if (netdev->kind != NETDEV_KIND_VLAN && netdev->vlanid <= VLANID_MAX) {
log_warning("VLAN Id configured for a %s in %s. Ignoring",
netdev_kind_to_string(netdev->kind), filename);
return 0;
}
if (netdev->kind != NETDEV_KIND_VXLAN && netdev->vxlanid <= VXLAN_VID_MAX) {
log_warning("VXLAN Id configured for a %s in %s. Ignoring",
netdev_kind_to_string(netdev->kind), filename);
return 0;
}
if (netdev->kind != NETDEV_KIND_MACVLAN &&
netdev->macvlan_mode != _NETDEV_MACVLAN_MODE_INVALID) {
log_warning("MACVLAN Mode configured for a %s in %s. Ignoring",
netdev_kind_to_string(netdev->kind), filename);
return 0;
}
netdev->filename = strdup(filename);
if (!netdev->filename)
return log_oom();
if (net_match_config(NULL, NULL, NULL, NULL, NULL,
netdev->match_host, netdev->match_virt,
netdev->match_kernel, netdev->match_arch,
NULL, NULL, NULL, NULL, NULL, NULL) <= 0)
return 0;
if (!netdev->mac) {
r = netdev_get_mac(netdev->ifname, &netdev->mac);
if (r < 0) {
log_error("Failed to generate predictable MAC address for %s",
netdev->ifname);
return r;
}
}
r = hashmap_put(netdev->manager->netdevs, netdev->ifname, netdev);
if (r < 0)
return r;
LIST_HEAD_INIT(netdev->callbacks);
switch (netdev->kind) {
case NETDEV_KIND_VETH:
if (!netdev->ifname_peer) {
log_warning("Veth NetDev without peer name configured "
"in %s. Ignoring", filename);
return 0;
}
if (!netdev->mac) {
r = netdev_get_mac(netdev->ifname_peer, &netdev->mac_peer);
if (r < 0) {
log_error("Failed to generate predictable MAC address for %s",
netdev->ifname_peer);
return r;
}
}
r = netdev_create_veth(netdev, netdev_create_handler);
if (r < 0)
return r;
break;
case NETDEV_KIND_DUMMY:
r = netdev_create_dummy(netdev, netdev_create_handler);
if (r < 0)
return r;
break;
case NETDEV_KIND_BRIDGE:
r = netdev_create_bridge(netdev, netdev_create_handler);
if (r < 0)
return r;
break;
case NETDEV_KIND_BOND:
r = netdev_create_bond(netdev, netdev_create_handler);
if (r < 0)
return r;
break;
default:
break;
}
log_debug_netdev(netdev, "loaded %s", netdev_kind_to_string(netdev->kind));
netdev = NULL;
return 0;
}
int netdev_load(Manager *manager) {
NetDev *netdev;
char **files, **f;
int r;
assert(manager);
while ((netdev = hashmap_first(manager->netdevs)))
netdev_unref(netdev);
r = conf_files_list_strv(&files, ".netdev", NULL, network_dirs);
if (r < 0) {
log_error("Failed to enumerate netdev files: %s", strerror(-r));
return r;
}
STRV_FOREACH_BACKWARDS(f, files) {
r = netdev_load_one(manager, *f);
if (r < 0)
return r;
}
strv_free(files);
return 0;
}