TError TNlLink::AddVeth(const std::string &name,
const std::string &hw,
int mtu, int nsFd) {
struct rtnl_link *veth, *peer;
int ret;
peer = rtnl_link_veth_alloc();
if (!peer)
return TError(EError::Unknown, "Unable to allocate veth");
rtnl_link_set_name(peer, rtnl_link_get_name(Link));
veth = rtnl_link_veth_get_peer(peer);
rtnl_link_set_name(veth, name.c_str());
if (nsFd >= 0)
rtnl_link_set_ns_fd(veth, nsFd);
if (mtu > 0) {
rtnl_link_set_mtu(peer, mtu);
rtnl_link_set_mtu(veth, mtu);
}
if (!hw.empty()) {
TNlAddr addr;
TError error = addr.Parse(AF_LLC, hw.c_str());
if (error)
return error;
rtnl_link_set_addr(veth, addr.Addr);
}
rtnl_link_set_flags(peer, IFF_UP);
Dump("add", veth);
rtnl_link_put(veth);
Dump("add", peer);
ret = rtnl_link_add(GetSock(), peer, NLM_F_CREATE | NLM_F_EXCL);
if (ret < 0) {
rtnl_link_put(peer);
return Error(ret, "Cannot add veth");
}
rtnl_link_put(peer);
return Load();
}
/**
* Create a new kernel veth device
* @arg sock netlink socket
* @arg name name of the veth device or NULL
* @arg peer_name name of its peer or NULL
* @arg pid pid of the process in the new netns
*
* Creates a new veth device pair in the kernel and move the peer
* to the network namespace where the process is. If no name is
* provided, the kernel will automatically pick a name of the
* form "veth%d" (e.g. veth0, veth1, etc.)
*
* @return 0 on success or a negative error code
*/
int rtnl_link_veth_add(struct nl_sock *sock, const char *name,
const char *peer_name, pid_t pid)
{
struct rtnl_link *link, *peer;
int err = -NLE_NOMEM;
if (!(link = rtnl_link_veth_alloc()))
return -NLE_NOMEM;
peer = rtnl_link_veth_get_peer(link);
if (name && peer_name) {
rtnl_link_set_name(link, name);
rtnl_link_set_name(peer, peer_name);
}
rtnl_link_set_ns_pid(peer, pid);
err = rtnl_link_add(sock, link, NLM_F_CREATE);
rtnl_link_put(peer);
rtnl_link_put(link);
return err;
}
/**
* Release a veth link and its peer
*
*/
void rtnl_link_veth_release(struct rtnl_link *link)
{
struct rtnl_link *peer = rtnl_link_veth_get_peer(link);
rtnl_link_put(peer);
rtnl_link_put(link);
}
