| /* |
| * VLAN netlink control interface |
| * |
| * Copyright (c) 2007 Patrick McHardy <kaber@trash.net> |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * version 2 as published by the Free Software Foundation. |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/netdevice.h> |
| #include <linux/if_vlan.h> |
| #include <linux/module.h> |
| #include <net/net_namespace.h> |
| #include <net/netlink.h> |
| #include <net/rtnetlink.h> |
| #include "vlan.h" |
| |
| |
| static const struct nla_policy vlan_policy[IFLA_VLAN_MAX + 1] = { |
| [IFLA_VLAN_ID] = { .type = NLA_U16 }, |
| [IFLA_VLAN_FLAGS] = { .len = sizeof(struct ifla_vlan_flags) }, |
| [IFLA_VLAN_EGRESS_QOS] = { .type = NLA_NESTED }, |
| [IFLA_VLAN_INGRESS_QOS] = { .type = NLA_NESTED }, |
| [IFLA_VLAN_PROTOCOL] = { .type = NLA_U16 }, |
| }; |
| |
| static const struct nla_policy vlan_map_policy[IFLA_VLAN_QOS_MAX + 1] = { |
| [IFLA_VLAN_QOS_MAPPING] = { .len = sizeof(struct ifla_vlan_qos_mapping) }, |
| }; |
| |
| |
| static inline int vlan_validate_qos_map(struct nlattr *attr) |
| { |
| if (!attr) |
| return 0; |
| return nla_validate_nested(attr, IFLA_VLAN_QOS_MAX, vlan_map_policy, |
| NULL); |
| } |
| |
| static int vlan_validate(struct nlattr *tb[], struct nlattr *data[], |
| struct netlink_ext_ack *extack) |
| { |
| struct ifla_vlan_flags *flags; |
| u16 id; |
| int err; |
| |
| if (tb[IFLA_ADDRESS]) { |
| if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) { |
| NL_SET_ERR_MSG_MOD(extack, "Invalid link address"); |
| return -EINVAL; |
| } |
| if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) { |
| NL_SET_ERR_MSG_MOD(extack, "Invalid link address"); |
| return -EADDRNOTAVAIL; |
| } |
| } |
| |
| if (!data) { |
| NL_SET_ERR_MSG_MOD(extack, "VLAN properties not specified"); |
| return -EINVAL; |
| } |
| |
| if (data[IFLA_VLAN_PROTOCOL]) { |
| switch (nla_get_be16(data[IFLA_VLAN_PROTOCOL])) { |
| case htons(ETH_P_8021Q): |
| case htons(ETH_P_8021AD): |
| break; |
| default: |
| NL_SET_ERR_MSG_MOD(extack, "Invalid VLAN protocol"); |
| return -EPROTONOSUPPORT; |
| } |
| } |
| |
| if (data[IFLA_VLAN_ID]) { |
| id = nla_get_u16(data[IFLA_VLAN_ID]); |
| if (id >= VLAN_VID_MASK) { |
| NL_SET_ERR_MSG_MOD(extack, "Invalid VLAN id"); |
| return -ERANGE; |
| } |
| } |
| if (data[IFLA_VLAN_FLAGS]) { |
| flags = nla_data(data[IFLA_VLAN_FLAGS]); |
| if ((flags->flags & flags->mask) & |
| ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP | |
| VLAN_FLAG_LOOSE_BINDING | VLAN_FLAG_MVRP)) { |
| NL_SET_ERR_MSG_MOD(extack, "Invalid VLAN flags"); |
| return -EINVAL; |
| } |
| } |
| |
| err = vlan_validate_qos_map(data[IFLA_VLAN_INGRESS_QOS]); |
| if (err < 0) { |
| NL_SET_ERR_MSG_MOD(extack, "Invalid ingress QOS map"); |
| return err; |
| } |
| err = vlan_validate_qos_map(data[IFLA_VLAN_EGRESS_QOS]); |
| if (err < 0) { |
| NL_SET_ERR_MSG_MOD(extack, "Invalid egress QOS map"); |
| return err; |
| } |
| return 0; |
| } |
| |
| static int vlan_changelink(struct net_device *dev, struct nlattr *tb[], |
| struct nlattr *data[], |
| struct netlink_ext_ack *extack) |
| { |
| struct ifla_vlan_flags *flags; |
| struct ifla_vlan_qos_mapping *m; |
| struct nlattr *attr; |
| int rem, err; |
| |
| if (data[IFLA_VLAN_FLAGS]) { |
| flags = nla_data(data[IFLA_VLAN_FLAGS]); |
| err = vlan_dev_change_flags(dev, flags->flags, flags->mask); |
| if (err) |
| return err; |
| } |
| if (data[IFLA_VLAN_INGRESS_QOS]) { |
| nla_for_each_nested(attr, data[IFLA_VLAN_INGRESS_QOS], rem) { |
| m = nla_data(attr); |
| vlan_dev_set_ingress_priority(dev, m->to, m->from); |
| } |
| } |
| if (data[IFLA_VLAN_EGRESS_QOS]) { |
| nla_for_each_nested(attr, data[IFLA_VLAN_EGRESS_QOS], rem) { |
| m = nla_data(attr); |
| err = vlan_dev_set_egress_priority(dev, m->from, m->to); |
| if (err) |
| return err; |
| } |
| } |
| return 0; |
| } |
| |
| static int vlan_newlink(struct net *src_net, struct net_device *dev, |
| struct nlattr *tb[], struct nlattr *data[], |
| struct netlink_ext_ack *extack) |
| { |
| struct vlan_dev_priv *vlan = vlan_dev_priv(dev); |
| struct net_device *real_dev; |
| unsigned int max_mtu; |
| __be16 proto; |
| int err; |
| |
| if (!data[IFLA_VLAN_ID]) { |
| NL_SET_ERR_MSG_MOD(extack, "VLAN id not specified"); |
| return -EINVAL; |
| } |
| |
| if (!tb[IFLA_LINK]) { |
| NL_SET_ERR_MSG_MOD(extack, "link not specified"); |
| return -EINVAL; |
| } |
| |
| real_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK])); |
| if (!real_dev) { |
| NL_SET_ERR_MSG_MOD(extack, "link does not exist"); |
| return -ENODEV; |
| } |
| |
| if (data[IFLA_VLAN_PROTOCOL]) |
| proto = nla_get_be16(data[IFLA_VLAN_PROTOCOL]); |
| else |
| proto = htons(ETH_P_8021Q); |
| |
| vlan->vlan_proto = proto; |
| vlan->vlan_id = nla_get_u16(data[IFLA_VLAN_ID]); |
| vlan->real_dev = real_dev; |
| dev->priv_flags |= (real_dev->priv_flags & IFF_XMIT_DST_RELEASE); |
| vlan->flags = VLAN_FLAG_REORDER_HDR; |
| |
| err = vlan_check_real_dev(real_dev, vlan->vlan_proto, vlan->vlan_id, |
| extack); |
| if (err < 0) |
| return err; |
| |
| max_mtu = netif_reduces_vlan_mtu(real_dev) ? real_dev->mtu - VLAN_HLEN : |
| real_dev->mtu; |
| if (!tb[IFLA_MTU]) |
| dev->mtu = max_mtu; |
| else if (dev->mtu > max_mtu) |
| return -EINVAL; |
| |
| err = vlan_changelink(dev, tb, data, extack); |
| if (!err) |
| err = register_vlan_dev(dev, extack); |
| if (err) |
| vlan_dev_uninit(dev); |
| return err; |
| } |
| |
| static inline size_t vlan_qos_map_size(unsigned int n) |
| { |
| if (n == 0) |
| return 0; |
| /* IFLA_VLAN_{EGRESS,INGRESS}_QOS + n * IFLA_VLAN_QOS_MAPPING */ |
| return nla_total_size(sizeof(struct nlattr)) + |
| nla_total_size(sizeof(struct ifla_vlan_qos_mapping)) * n; |
| } |
| |
| static size_t vlan_get_size(const struct net_device *dev) |
| { |
| struct vlan_dev_priv *vlan = vlan_dev_priv(dev); |
| |
| return nla_total_size(2) + /* IFLA_VLAN_PROTOCOL */ |
| nla_total_size(2) + /* IFLA_VLAN_ID */ |
| nla_total_size(sizeof(struct ifla_vlan_flags)) + /* IFLA_VLAN_FLAGS */ |
| vlan_qos_map_size(vlan->nr_ingress_mappings) + |
| vlan_qos_map_size(vlan->nr_egress_mappings); |
| } |
| |
| static int vlan_fill_info(struct sk_buff *skb, const struct net_device *dev) |
| { |
| struct vlan_dev_priv *vlan = vlan_dev_priv(dev); |
| struct vlan_priority_tci_mapping *pm; |
| struct ifla_vlan_flags f; |
| struct ifla_vlan_qos_mapping m; |
| struct nlattr *nest; |
| unsigned int i; |
| |
| if (nla_put_be16(skb, IFLA_VLAN_PROTOCOL, vlan->vlan_proto) || |
| nla_put_u16(skb, IFLA_VLAN_ID, vlan->vlan_id)) |
| goto nla_put_failure; |
| if (vlan->flags) { |
| f.flags = vlan->flags; |
| f.mask = ~0; |
| if (nla_put(skb, IFLA_VLAN_FLAGS, sizeof(f), &f)) |
| goto nla_put_failure; |
| } |
| if (vlan->nr_ingress_mappings) { |
| nest = nla_nest_start(skb, IFLA_VLAN_INGRESS_QOS); |
| if (nest == NULL) |
| goto nla_put_failure; |
| |
| for (i = 0; i < ARRAY_SIZE(vlan->ingress_priority_map); i++) { |
| if (!vlan->ingress_priority_map[i]) |
| continue; |
| |
| m.from = i; |
| m.to = vlan->ingress_priority_map[i]; |
| if (nla_put(skb, IFLA_VLAN_QOS_MAPPING, |
| sizeof(m), &m)) |
| goto nla_put_failure; |
| } |
| nla_nest_end(skb, nest); |
| } |
| |
| if (vlan->nr_egress_mappings) { |
| nest = nla_nest_start(skb, IFLA_VLAN_EGRESS_QOS); |
| if (nest == NULL) |
| goto nla_put_failure; |
| |
| for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) { |
| for (pm = vlan->egress_priority_map[i]; pm; |
| pm = pm->next) { |
| if (!pm->vlan_qos) |
| continue; |
| |
| m.from = pm->priority; |
| m.to = (pm->vlan_qos >> 13) & 0x7; |
| if (nla_put(skb, IFLA_VLAN_QOS_MAPPING, |
| sizeof(m), &m)) |
| goto nla_put_failure; |
| } |
| } |
| nla_nest_end(skb, nest); |
| } |
| return 0; |
| |
| nla_put_failure: |
| return -EMSGSIZE; |
| } |
| |
| static struct net *vlan_get_link_net(const struct net_device *dev) |
| { |
| struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; |
| |
| return dev_net(real_dev); |
| } |
| |
| struct rtnl_link_ops vlan_link_ops __read_mostly = { |
| .kind = "vlan", |
| .maxtype = IFLA_VLAN_MAX, |
| .policy = vlan_policy, |
| .priv_size = sizeof(struct vlan_dev_priv), |
| .setup = vlan_setup, |
| .validate = vlan_validate, |
| .newlink = vlan_newlink, |
| .changelink = vlan_changelink, |
| .dellink = unregister_vlan_dev, |
| .get_size = vlan_get_size, |
| .fill_info = vlan_fill_info, |
| .get_link_net = vlan_get_link_net, |
| }; |
| |
| int __init vlan_netlink_init(void) |
| { |
| return rtnl_link_register(&vlan_link_ops); |
| } |
| |
| void __exit vlan_netlink_fini(void) |
| { |
| rtnl_link_unregister(&vlan_link_ops); |
| } |
| |
| MODULE_ALIAS_RTNL_LINK("vlan"); |