/**
* Allocate link object of type veth
*
* @return Allocated link object or NULL.
*/
struct rtnl_link *rtnl_link_veth_alloc(void)
{
struct rtnl_link *link, *peer;
int err;
if (!(link = rtnl_link_alloc()))
return NULL;
if (!(peer = rtnl_link_alloc())) {
rtnl_link_put(link);
return NULL;
}
if ((err = rtnl_link_set_type(link, "veth")) < 0) {
rtnl_link_put(peer);
rtnl_link_put(link);
return NULL;
}
if ((err = rtnl_link_set_type(peer, "veth")) < 0) {
rtnl_link_put(peer);
rtnl_link_put(link);
return NULL;
}
link->l_info = peer;
peer->l_info = link;
return link;
}
int main(int argc, char *argv[])
{
struct rtnl_link *link;
struct nl_sock *sk;
int err;
sk = nl_socket_alloc();
if ((err = nl_connect(sk, NETLINK_ROUTE)) < 0) {
nl_perror(err, "Unable to connect socket");
return err;
}
link = rtnl_link_alloc();
rtnl_link_set_name(link, "my_bond");
if ((err = rtnl_link_set_type(link, "bond")) < 0) {
nl_perror(err, "Unable to set link info type");
return err;
}
if ((err = rtnl_link_add(sk, link, NLM_F_CREATE)) < 0) {
nl_perror(err, "Unable to add link");
return err;
}
rtnl_link_put(link);
nl_close(sk);
return 0;
}
/**
* Create a new kernel bonding device
* @arg sock netlink socket
* @arg name name of bonding device or NULL
* @arg opts bonding options (currently unused)
*
* Creates a new bonding device in the kernel. If no name is
* provided, the kernel will automatically pick a name of the
* form "type%d" (e.g. bond0, vlan1, etc.)
*
* The \a opts argument is currently unused. In the future, it
* may be used to carry additional bonding options to be set
* when creating the bonding device.
*
* @note When letting the kernel assign a name, it will become
* difficult to retrieve the interface afterwards because
* you have to guess the name the kernel has chosen. It is
* therefore not recommended to not provide a device name.
*
* @see rtnl_link_bond_enslave()
* @see rtnl_link_bond_release()
*
* @return 0 on success or a negative error code
*/
int rtnl_link_bond_add(struct nl_sock *sock, const char *name,
struct rtnl_link *opts)
{
struct rtnl_link *link;
int err;
if (!(link = rtnl_link_alloc()))
return -NLE_NOMEM;
if (!name) {
if (opts)
name = rtnl_link_get_name(opts);
if (!name)
return -NLE_MISSING_ATTR;
}
if ((err = rtnl_link_set_type(link, "bond")) < 0)
goto errout;
rtnl_link_set_name(link, name);
err = rtnl_link_add(sock, link, NLM_F_CREATE);
errout:
rtnl_link_put(link);
return err;
}
/**
* Allocate link object of type VLAN
*
* @return Allocated link object or NULL.
*/
struct rtnl_link *rtnl_link_vlan_alloc(void)
{
struct rtnl_link *link;
int err;
if (!(link = rtnl_link_alloc()))
return NULL;
if ((err = rtnl_link_set_type(link, "vlan")) < 0) {
rtnl_link_put(link);
return NULL;
}
return link;
}
static int veth_clone(struct rtnl_link *dst, struct rtnl_link *src)
{
struct rtnl_link *dst_peer , *src_peer = src->l_info;
int err;
dst_peer = dst->l_info = rtnl_link_alloc();
if (!dst_peer || !src_peer)
return -NLE_NOMEM;
if ((err = rtnl_link_set_type(dst, "veth")) < 0) {
rtnl_link_put(dst_peer);
return err;
}
memcpy(dst_peer, src_peer, sizeof(struct rtnl_link));
return 0;
}
int create_bridge(struct nl_sock *sk, struct nl_cache *link_cache, const char *name) {
struct rtnl_link *link;
int err;
link = rtnl_link_alloc();
if ((err = rtnl_link_set_type(link, "bridge")) < 0) {
rtnl_link_put(link);
return err;
}
rtnl_link_set_name(link, name);
if ((err = rtnl_link_add(sk, link, NLM_F_CREATE)) < 0) {
return err;
}
rtnl_link_put(link);
return 0;
}
static int vlan_clone(struct rtnl_link *dst, struct rtnl_link *src)
{
struct vlan_info *vdst, *vsrc = src->l_info;
int err;
dst->l_info = NULL;
if ((err = rtnl_link_set_type(dst, "vlan")) < 0)
return err;
vdst = dst->l_info;
vdst->vi_egress_qos = calloc(vsrc->vi_egress_size,
sizeof(struct vlan_map));
if (!vdst->vi_egress_qos)
return -NLE_NOMEM;
memcpy(vdst->vi_egress_qos, vsrc->vi_egress_qos,
vsrc->vi_egress_size * sizeof(struct vlan_map));
return 0;
}
/**
* Add a link to a bond (enslave)
* @arg sock netlink socket
* @arg master ifindex of bonding master
* @arg slave ifindex of slave link to add to bond
*
* This function is identical to rtnl_link_bond_enslave() except that
* it takes interface indices instead of rtnl_link objcets.
*
* @see rtnl_link_bond_enslave()
*
* @return 0 on success or a negative error code.
*/
int rtnl_link_bond_enslave_ifindex(struct nl_sock *sock, int master,
int slave)
{
struct rtnl_link *link;
int err;
if (!(link = rtnl_link_alloc()))
return -NLE_NOMEM;
if ((err = rtnl_link_set_type(link, "bond")) < 0)
goto errout;
rtnl_link_set_ifindex(link, slave);
rtnl_link_set_master(link, master);
if ((err = rtnl_link_change(sock, link, link, 0)) < 0)
goto errout;
rtnl_link_put(link);
/*
* Due to the kernel not signaling whether this opertion is
* supported or not, we will retrieve the attribute to see if the
* request was successful. If the master assigned remains unchanged
* we will return NLE_OPNOTSUPP to allow performing backwards
* compatibility of some sort.
*/
if ((err = rtnl_link_get_kernel(sock, slave, NULL, &link)) < 0)
return err;
if (rtnl_link_get_master(link) != master)
err = -NLE_OPNOTSUPP;
errout:
rtnl_link_put(link);
return err;
}
/*
* Add a vlan interface with name 'vlan_if_name', VLAN ID 'vid' and
* tagged interface 'if_name'.
*
* returns -1 on error
* returns 1 if the interface already exists
* returns 0 otherwise
*/
int vlan_add(const char *if_name, int vid, const char *vlan_if_name)
{
int ret = -1;
struct nl_sock *handle = NULL;
struct nl_cache *cache = NULL;
struct rtnl_link *rlink = NULL;
int if_idx = 0;
wpa_printf(MSG_DEBUG, "VLAN: vlan_add(if_name=%s, vid=%d, "
"vlan_if_name=%s)", if_name, vid, vlan_if_name);
if ((os_strlen(if_name) + 1) > IFNAMSIZ) {
wpa_printf(MSG_ERROR, "VLAN: Interface name too long: '%s'",
if_name);
return -1;
}
if ((os_strlen(vlan_if_name) + 1) > IFNAMSIZ) {
wpa_printf(MSG_ERROR, "VLAN: Interface name too long: '%s'",
vlan_if_name);
return -1;
}
handle = nl_socket_alloc();
if (!handle) {
wpa_printf(MSG_ERROR, "VLAN: failed to open netlink socket");
goto vlan_add_error;
}
if (nl_connect(handle, NETLINK_ROUTE) < 0) {
wpa_printf(MSG_ERROR, "VLAN: failed to connect to netlink");
goto vlan_add_error;
}
if (rtnl_link_alloc_cache(handle, AF_UNSPEC, &cache) < 0) {
cache = NULL;
wpa_printf(MSG_ERROR, "VLAN: failed to alloc cache");
goto vlan_add_error;
}
if (!(if_idx = rtnl_link_name2i(cache, if_name))) {
/* link does not exist */
wpa_printf(MSG_ERROR, "VLAN: interface %s does not exist",
if_name);
goto vlan_add_error;
}
if ((rlink = rtnl_link_get_by_name(cache, vlan_if_name))) {
/* link does exist */
rtnl_link_put(rlink);
rlink = NULL;
wpa_printf(MSG_ERROR, "VLAN: interface %s already exists",
vlan_if_name);
ret = 1;
goto vlan_add_error;
}
rlink = rtnl_link_alloc();
if (!rlink) {
wpa_printf(MSG_ERROR, "VLAN: failed to allocate new link");
goto vlan_add_error;
}
if (rtnl_link_set_type(rlink, "vlan") < 0) {
wpa_printf(MSG_ERROR, "VLAN: failed to set link type");
goto vlan_add_error;
}
rtnl_link_set_link(rlink, if_idx);
rtnl_link_set_name(rlink, vlan_if_name);
if (rtnl_link_vlan_set_id(rlink, vid) < 0) {
wpa_printf(MSG_ERROR, "VLAN: failed to set link vlan id");
goto vlan_add_error;
}
if (rtnl_link_add(handle, rlink, NLM_F_CREATE) < 0) {
wpa_printf(MSG_ERROR, "VLAN: failed to create link %s for "
"vlan %d on %s (%d)",
vlan_if_name, vid, if_name, if_idx);
goto vlan_add_error;
}
ret = 0;
vlan_add_error:
if (rlink)
rtnl_link_put(rlink);
if (cache)
nl_cache_free(cache);
if (handle)
nl_socket_free(handle);
return ret;
}
