static int veth_newlink(struct net_device *dev, struct nlattr *tb[], struct nlattr *data[]) { int err; struct net_device *peer; struct veth_priv *priv; char ifname[IFNAMSIZ]; struct nlattr *peer_tb[IFLA_MAX + 1], **tbp; /* * create and register peer first * * struct ifinfomsg is at the head of VETH_INFO_PEER, but we * skip it since no info from it is useful yet */ if (data != NULL && data[VETH_INFO_PEER] != NULL) { struct nlattr *nla_peer; nla_peer = data[VETH_INFO_PEER]; err = nla_parse(peer_tb, IFLA_MAX, nla_data(nla_peer) + sizeof(struct ifinfomsg), nla_len(nla_peer) - sizeof(struct ifinfomsg), ifla_policy); if (err < 0) return err; err = veth_validate(peer_tb, NULL); if (err < 0) return err; tbp = peer_tb; } else tbp = tb; if (tbp[IFLA_IFNAME]) nla_strlcpy(ifname, tbp[IFLA_IFNAME], IFNAMSIZ); else snprintf(ifname, IFNAMSIZ, DRV_NAME "%%d"); peer = rtnl_create_link(dev->nd_net, ifname, &veth_link_ops, tbp); if (IS_ERR(peer)) return PTR_ERR(peer); if (tbp[IFLA_ADDRESS] == NULL) random_ether_addr(peer->dev_addr); err = register_netdevice(peer); if (err < 0) goto err_register_peer; netif_carrier_off(peer); /* * register dev last * * note, that since we've registered new device the dev's name * should be re-allocated */ if (tb[IFLA_ADDRESS] == NULL) random_ether_addr(dev->dev_addr); if (tb[IFLA_IFNAME]) nla_strlcpy(dev->name, tb[IFLA_IFNAME], IFNAMSIZ); else snprintf(dev->name, IFNAMSIZ, DRV_NAME "%%d"); if (strchr(dev->name, '%')) { err = dev_alloc_name(dev, dev->name); if (err < 0) goto err_alloc_name; } err = register_netdevice(dev); if (err < 0) goto err_register_dev; netif_carrier_off(dev); /* * tie the deviced together */ priv = netdev_priv(dev); priv->dev = dev; priv->peer = peer; list_add(&priv->list, &veth_list); priv = netdev_priv(peer); priv->dev = peer; priv->peer = dev; INIT_LIST_HEAD(&priv->list); return 0; err_register_dev: /* nothing to do */ err_alloc_name: unregister_netdevice(peer); return err; err_register_peer: free_netdev(peer); return err; }
static int veth_newlink(struct net *src_net, struct net_device *dev, struct nlattr *tb[], struct nlattr *data[]) { int err; struct net_device *peer; struct veth_priv *priv; char ifname[IFNAMSIZ]; struct nlattr *peer_tb[IFLA_MAX + 1], **tbp; struct ifinfomsg *ifmp; struct net *net; /* * create and register peer first */ if (data != NULL && data[VETH_INFO_PEER] != NULL) { struct nlattr *nla_peer; nla_peer = data[VETH_INFO_PEER]; ifmp = nla_data(nla_peer); err = nla_parse(peer_tb, IFLA_MAX, nla_data(nla_peer) + sizeof(struct ifinfomsg), nla_len(nla_peer) - sizeof(struct ifinfomsg), ifla_policy); if (err < 0) return err; err = veth_validate(peer_tb, NULL); if (err < 0) return err; tbp = peer_tb; } else { ifmp = NULL; tbp = tb; } if (tbp[IFLA_IFNAME]) nla_strlcpy(ifname, tbp[IFLA_IFNAME], IFNAMSIZ); else snprintf(ifname, IFNAMSIZ, DRV_NAME "%%d"); net = rtnl_link_get_net(src_net, tbp); if (IS_ERR(net)) return PTR_ERR(net); peer = rtnl_create_link(src_net, net, ifname, &veth_link_ops, tbp); if (IS_ERR(peer)) { put_net(net); return PTR_ERR(peer); } if (tbp[IFLA_ADDRESS] == NULL) random_ether_addr(peer->dev_addr); err = register_netdevice(peer); put_net(net); net = NULL; if (err < 0) goto err_register_peer; netif_carrier_off(peer); err = rtnl_configure_link(peer, ifmp); if (err < 0) goto err_configure_peer; /* * register dev last * * note, that since we've registered new device the dev's name * should be re-allocated */ if (tb[IFLA_ADDRESS] == NULL) random_ether_addr(dev->dev_addr); if (tb[IFLA_IFNAME]) nla_strlcpy(dev->name, tb[IFLA_IFNAME], IFNAMSIZ); else snprintf(dev->name, IFNAMSIZ, DRV_NAME "%%d"); if (strchr(dev->name, '%')) { err = dev_alloc_name(dev, dev->name); if (err < 0) goto err_alloc_name; } err = register_netdevice(dev); if (err < 0) goto err_register_dev; netif_carrier_off(dev); /* * tie the deviced together */ priv = netdev_priv(dev); priv->peer = peer; priv = netdev_priv(peer); priv->peer = dev; return 0; err_register_dev: /* nothing to do */ err_alloc_name: err_configure_peer: unregister_netdevice(peer); return err; err_register_peer: free_netdev(peer); return err; }