#include <net/if.h>

#include "networkd-netdev.h"

#include "networkd-link.h"

#include "network-internal.h"

#include "path-util.h"

#include "conf-files.h"

#include "conf-parser.h"

#include "list.h"

#include "siphash24.h"

const NetDevVTable * const netdev_vtable[_NETDEV_KIND_MAX] = {

[NETDEV_KIND_BRIDGE] = &bridge_vtable,

[NETDEV_KIND_BOND] = &bond_vtable,

[NETDEV_KIND_VLAN] = &vlan_vtable,

[NETDEV_KIND_MACVLAN] = &macvlan_vtable,

[NETDEV_KIND_VXLAN] = &vxlan_vtable,

[NETDEV_KIND_IPIP] = &ipip_vtable,

[NETDEV_KIND_GRE] = &gre_vtable,

[NETDEV_KIND_SIT] = &sit_vtable,

[NETDEV_KIND_VTI] = &vti_vtable,

[NETDEV_KIND_VETH] = &veth_vtable,

[NETDEV_KIND_DUMMY] = &dummy_vtable,

[NETDEV_KIND_TUN] = &tun_vtable,

[NETDEV_KIND_TAP] = &tap_vtable,

};

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->mac);

condition_free_list(netdev->match_host);

condition_free_list(netdev->match_virt);

condition_free_list(netdev->match_kernel);

condition_free_list(netdev->match_arch);

if (NETDEV_VTABLE(netdev) &&

NETDEV_VTABLE(netdev)->done)

NETDEV_VTABLE(netdev)->done(netdev);

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_netdev_debug(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_netdev_error(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_netdev_error(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_netdev_error(netdev,

"Could not send rtnetlink message: %s",

strerror(-r));

return r;

}

link_ref(link);

log_netdev_debug(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

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;

}

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_netdev_debug(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;

}

log_netdev_debug(netdev, "created");

return 1;

}

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);

log_netdev_debug(netdev, "will enslave '%s', when reday",

link->ifname);

}

return 0;

}

int netdev_set_ifindex(NetDev *netdev, sd_rtnl_message *message) {

uint16_t type;

const char *kind;

const char *received_kind;

const char *received_name;

int r, ifindex;

assert(netdev);

assert(message);

r = sd_rtnl_message_get_type(message, &type);

if (r < 0) {

log_netdev_error(netdev, "Could not get rtnl message type");

return r;

}

if (type != RTM_NEWLINK) {

log_netdev_error(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_netdev_error(netdev, "Could not get ifindex: %s", strerror(-r));

netdev_enter_failed(netdev);

return r;

} else if (ifindex <= 0) {

log_netdev_error(netdev, "Got invalid ifindex: %d", ifindex);

netdev_enter_failed(netdev);

return r;

}

if (netdev->ifindex > 0) {

if (netdev->ifindex != ifindex) {

log_netdev_error(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_netdev_error(netdev, "Could not get IFNAME");

return r;

}

if (!streq(netdev->ifname, received_name)) {

log_netdev_error(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_netdev_error(netdev, "Could not get LINKINFO");

return r;

}

r = sd_rtnl_message_read_string(message, IFLA_INFO_KIND, &received_kind);

if (r < 0) {

log_netdev_error(netdev, "Could not get KIND");

return r;

}

r = sd_rtnl_message_exit_container(message);

if (r < 0) {

log_netdev_error(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_netdev_error(netdev, "Could not get kind");

netdev_enter_failed(netdev);

return -EINVAL;

}

}

if (!streq(kind, received_kind)) {

log_netdev_error(netdev,

"Received newlink with wrong KIND %s, "

"expected %s", received_kind, kind);

netdev_enter_failed(netdev);

return r;

}

netdev->ifindex = ifindex;

log_netdev_debug(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)

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

memcpy(v + sizeof(sd_id128_t), ifname, l);

/* Let's hash the host machine ID plus the container name. We

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_create(NetDev *netdev, Link *link,

sd_rtnl_message_handler_t callback) {

int r;

assert(netdev);

assert(!link || callback);

/* create netdev */

if (NETDEV_VTABLE(netdev)->create) {

assert(!link);

r = NETDEV_VTABLE(netdev)->create(netdev);

if (r < 0)

return r;

log_netdev_debug(netdev, "created");

} else {

_cleanup_rtnl_message_unref_ sd_rtnl_message *m = NULL;

r = sd_rtnl_message_new_link(netdev->manager->rtnl, &m, RTM_NEWLINK, 0);

if (r < 0) {

log_netdev_error(netdev,

"Could not allocate RTM_NEWLINK message: %s",

strerror(-r));

return r;

}

r = sd_rtnl_message_append_string(m, IFLA_IFNAME, netdev->ifname);

if (r < 0) {

log_netdev_error(netdev,

"Could not append IFLA_IFNAME, attribute: %s",

strerror(-r));

return r;

}

if (netdev->mac) {

r = sd_rtnl_message_append_ether_addr(m, IFLA_ADDRESS, netdev->mac);

if (r < 0) {

log_netdev_error(netdev,

"Could not append IFLA_ADDRESS attribute: %s",

strerror(-r));

return r;

}

}

if (netdev->mtu) {

r = sd_rtnl_message_append_u32(m, IFLA_MTU, netdev->mtu);

if (r < 0) {

log_netdev_error(netdev,

"Could not append IFLA_MTU attribute: %s",

strerror(-r));

return r;

}

}

if (link) {

r = sd_rtnl_message_append_u32(m, IFLA_LINK, link->ifindex);

if (r < 0) {

log_netdev_error(netdev,

"Could not append IFLA_LINK attribute: %s",

strerror(-r));

return r;

}

}

r = sd_rtnl_message_open_container(m, IFLA_LINKINFO);

if (r < 0) {

log_netdev_error(netdev,

"Could not append IFLA_LINKINFO attribute: %s",

strerror(-r));

return r;

}

r = sd_rtnl_message_open_container_union(m, IFLA_INFO_DATA,

netdev_kind_to_string(netdev->kind));

if (r < 0) {

log_netdev_error(netdev,

"Could not append IFLA_INFO_DATA attribute: %s",

strerror(-r));

return r;

}

if (NETDEV_VTABLE(netdev)->fill_message_create) {

r = NETDEV_VTABLE(netdev)->fill_message_create(netdev, link, m);

if (r < 0)

return r;

}

r = sd_rtnl_message_close_container(m);

if (r < 0) {

log_netdev_error(netdev,

"Could not append IFLA_LINKINFO attribute: %s",

strerror(-r));

return r;

}

r = sd_rtnl_message_close_container(m);

if (r < 0) {

log_netdev_error(netdev,

"Could not append IFLA_LINKINFO attribute: %s",

strerror(-r));

return r;

}

if (link) {

r = sd_rtnl_call_async(netdev->manager->rtnl, m,

callback, link, 0, NULL);

if (r < 0) {

log_netdev_error(netdev,

"Could not send rtnetlink message: %s",

strerror(-r));

return r;

}

link_ref(link);

} else {

r = sd_rtnl_call_async(netdev->manager->rtnl, m,

netdev_create_handler, netdev, 0,

NULL);

if (r < 0) {

log_netdev_error(netdev,

"Could not send rtnetlink message: %s",

strerror(-r));

return r;

}

netdev_ref(netdev);

}

netdev->state = NETDEV_STATE_CREATING;

log_netdev_debug(netdev, "creating");

}

return 0;

}

int netdev_join(NetDev *netdev, Link *link, sd_rtnl_message_handler_t callback) {

int r;

assert(netdev);

assert(netdev->manager);

assert(netdev->manager->rtnl);

assert(NETDEV_VTABLE(netdev));

switch (NETDEV_VTABLE(netdev)->create_type) {

case NETDEV_CREATE_MASTER:

r = netdev_enslave(netdev, link, callback);

if (r < 0)

return r;

break;

case NETDEV_CREATE_STACKED:

r = netdev_create(netdev, link, callback);

if (r < 0)

return r;

break;

default:

assert_not_reached("Can not join independent netdev");

}

return 0;

}

static int netdev_load_one(Manager *manager, const char *filename) {

_cleanup_netdev_unref_ NetDev *netdev = NULL;

_cleanup_free_ NetDev *netdev_raw = NULL;

_cleanup_fclose_ FILE *file = NULL;

int r;

assert(manager);

assert(filename);

file = fopen(filename, "re");

if (!file) {

if (errno == ENOENT)

return 0;

else

return -errno;

}

if (null_or_empty_fd(fileno(file))) {

log_debug("Skipping empty file: %s", filename);

return 0;

}

netdev_raw = new0(NetDev, 1);

if (!netdev_raw)

return log_oom();

netdev_raw->kind = _NETDEV_KIND_INVALID;

r = config_parse(NULL, filename, file,

"Match\0NetDev\0",

config_item_perf_lookup, network_netdev_gperf_lookup,

true, false, true, netdev_raw);

if (r < 0)

return r;

r = fseek(file, 0, SEEK_SET);

if (r < 0)

return -errno;

/* skip out early if configuration does not match the environment */

if (net_match_config(NULL, NULL, NULL, NULL, NULL,

netdev_raw->match_host, netdev_raw->match_virt,

netdev_raw->match_kernel, netdev_raw->match_arch,

NULL, NULL, NULL, NULL, NULL, NULL) <= 0)

return 0;

if (!NETDEV_VTABLE(netdev_raw)) {

log_warning("NetDev with invalid Kind configured in %s. Ignoring", filename);

return 0;

}

if (!netdev_raw->ifname) {

log_warning("NetDev without Name configured in %s. Ignoring", filename);

return 0;

}

netdev = malloc0(NETDEV_VTABLE(netdev_raw)->object_size);

if (!netdev)

return log_oom();

netdev->n_ref = 1;

netdev->manager = manager;

netdev->state = _NETDEV_STATE_INVALID;

netdev->kind = netdev_raw->kind;

netdev->ifname = netdev_raw->ifname;

if (NETDEV_VTABLE(netdev)->init)

NETDEV_VTABLE(netdev)->init(netdev);

r = config_parse(NULL, filename, file,

NETDEV_VTABLE(netdev)->sections,

config_item_perf_lookup, network_netdev_gperf_lookup,

false, false, false, netdev);

if (r < 0)

return r;

/* verify configuration */

if (NETDEV_VTABLE(netdev)->config_verify) {

r = NETDEV_VTABLE(netdev)->config_verify(netdev, filename);

if (r < 0)

return 0;

}

netdev->filename = strdup(filename);

if (!netdev->filename)

return log_oom();

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);

log_netdev_debug(netdev, "loaded %s", netdev_kind_to_string(netdev->kind));

switch (NETDEV_VTABLE(netdev)->create_type) {

case NETDEV_CREATE_MASTER:

case NETDEV_CREATE_INDEPENDENT:

r = netdev_create(netdev, NULL, NULL);

if (r < 0)

return 0;

break;

default:

break;

}

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)

return log_error_errno(r, "Failed to enumerate netdev files: %m");

STRV_FOREACH_BACKWARDS(f, files) {

r = netdev_load_one(manager, *f);

if (r < 0)

return r;

}

strv_free(files);

return 0;

}