313 lines
7.8 KiB
C
313 lines
7.8 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* VLAN netlink control interface
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*
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* Copyright (c) 2007 Patrick McHardy <kaber@trash.net>
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*/
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#include <linux/kernel.h>
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#include <linux/netdevice.h>
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#include <linux/if_vlan.h>
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#include <linux/module.h>
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#include <net/net_namespace.h>
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#include <net/netlink.h>
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#include <net/rtnetlink.h>
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#include "vlan.h"
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static const struct nla_policy vlan_policy[IFLA_VLAN_MAX + 1] = {
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[IFLA_VLAN_ID] = { .type = NLA_U16 },
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[IFLA_VLAN_FLAGS] = { .len = sizeof(struct ifla_vlan_flags) },
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[IFLA_VLAN_EGRESS_QOS] = { .type = NLA_NESTED },
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[IFLA_VLAN_INGRESS_QOS] = { .type = NLA_NESTED },
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[IFLA_VLAN_PROTOCOL] = { .type = NLA_U16 },
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};
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static const struct nla_policy vlan_map_policy[IFLA_VLAN_QOS_MAX + 1] = {
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[IFLA_VLAN_QOS_MAPPING] = { .len = sizeof(struct ifla_vlan_qos_mapping) },
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};
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static inline int vlan_validate_qos_map(struct nlattr *attr)
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{
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if (!attr)
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return 0;
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return nla_validate_nested_deprecated(attr, IFLA_VLAN_QOS_MAX,
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vlan_map_policy, NULL);
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}
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static int vlan_validate(struct nlattr *tb[], struct nlattr *data[],
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struct netlink_ext_ack *extack)
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{
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struct ifla_vlan_flags *flags;
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u16 id;
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int err;
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if (tb[IFLA_ADDRESS]) {
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if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
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NL_SET_ERR_MSG_MOD(extack, "Invalid link address");
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return -EINVAL;
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}
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if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
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NL_SET_ERR_MSG_MOD(extack, "Invalid link address");
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return -EADDRNOTAVAIL;
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}
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}
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if (!data) {
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NL_SET_ERR_MSG_MOD(extack, "VLAN properties not specified");
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return -EINVAL;
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}
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if (data[IFLA_VLAN_PROTOCOL]) {
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switch (nla_get_be16(data[IFLA_VLAN_PROTOCOL])) {
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case htons(ETH_P_8021Q):
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case htons(ETH_P_8021AD):
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break;
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default:
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NL_SET_ERR_MSG_MOD(extack, "Invalid VLAN protocol");
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return -EPROTONOSUPPORT;
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}
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}
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if (data[IFLA_VLAN_ID]) {
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id = nla_get_u16(data[IFLA_VLAN_ID]);
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if (id >= VLAN_VID_MASK) {
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NL_SET_ERR_MSG_MOD(extack, "Invalid VLAN id");
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return -ERANGE;
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}
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}
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if (data[IFLA_VLAN_FLAGS]) {
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flags = nla_data(data[IFLA_VLAN_FLAGS]);
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if ((flags->flags & flags->mask) &
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~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP |
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VLAN_FLAG_LOOSE_BINDING | VLAN_FLAG_MVRP |
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VLAN_FLAG_BRIDGE_BINDING)) {
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NL_SET_ERR_MSG_MOD(extack, "Invalid VLAN flags");
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return -EINVAL;
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}
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}
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err = vlan_validate_qos_map(data[IFLA_VLAN_INGRESS_QOS]);
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if (err < 0) {
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NL_SET_ERR_MSG_MOD(extack, "Invalid ingress QOS map");
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return err;
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}
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err = vlan_validate_qos_map(data[IFLA_VLAN_EGRESS_QOS]);
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if (err < 0) {
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NL_SET_ERR_MSG_MOD(extack, "Invalid egress QOS map");
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return err;
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}
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return 0;
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}
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static int vlan_changelink(struct net_device *dev, struct nlattr *tb[],
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struct nlattr *data[],
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struct netlink_ext_ack *extack)
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{
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struct ifla_vlan_flags *flags;
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struct ifla_vlan_qos_mapping *m;
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struct nlattr *attr;
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int rem, err;
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if (data[IFLA_VLAN_FLAGS]) {
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flags = nla_data(data[IFLA_VLAN_FLAGS]);
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err = vlan_dev_change_flags(dev, flags->flags, flags->mask);
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if (err)
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return err;
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}
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if (data[IFLA_VLAN_INGRESS_QOS]) {
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nla_for_each_nested(attr, data[IFLA_VLAN_INGRESS_QOS], rem) {
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m = nla_data(attr);
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vlan_dev_set_ingress_priority(dev, m->to, m->from);
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}
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}
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if (data[IFLA_VLAN_EGRESS_QOS]) {
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nla_for_each_nested(attr, data[IFLA_VLAN_EGRESS_QOS], rem) {
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m = nla_data(attr);
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err = vlan_dev_set_egress_priority(dev, m->from, m->to);
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if (err)
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return err;
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}
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}
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return 0;
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}
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static int vlan_newlink(struct net *src_net, struct net_device *dev,
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struct nlattr *tb[], struct nlattr *data[],
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struct netlink_ext_ack *extack)
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{
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struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
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struct net_device *real_dev;
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unsigned int max_mtu;
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__be16 proto;
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int err;
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if (!data[IFLA_VLAN_ID]) {
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NL_SET_ERR_MSG_MOD(extack, "VLAN id not specified");
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return -EINVAL;
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}
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if (!tb[IFLA_LINK]) {
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NL_SET_ERR_MSG_MOD(extack, "link not specified");
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return -EINVAL;
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}
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real_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
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if (!real_dev) {
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NL_SET_ERR_MSG_MOD(extack, "link does not exist");
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return -ENODEV;
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}
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if (data[IFLA_VLAN_PROTOCOL])
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proto = nla_get_be16(data[IFLA_VLAN_PROTOCOL]);
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else
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proto = htons(ETH_P_8021Q);
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vlan->vlan_proto = proto;
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vlan->vlan_id = nla_get_u16(data[IFLA_VLAN_ID]);
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vlan->real_dev = real_dev;
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dev->priv_flags |= (real_dev->priv_flags & IFF_XMIT_DST_RELEASE);
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vlan->flags = VLAN_FLAG_REORDER_HDR;
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err = vlan_check_real_dev(real_dev, vlan->vlan_proto, vlan->vlan_id,
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extack);
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if (err < 0)
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return err;
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max_mtu = netif_reduces_vlan_mtu(real_dev) ? real_dev->mtu - VLAN_HLEN :
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real_dev->mtu;
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if (!tb[IFLA_MTU])
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dev->mtu = max_mtu;
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else if (dev->mtu > max_mtu)
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return -EINVAL;
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/* Note: If this initial vlan_changelink() fails, we need
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* to call vlan_dev_free_egress_priority() to free memory.
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*/
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err = vlan_changelink(dev, tb, data, extack);
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if (!err)
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err = register_vlan_dev(dev, extack);
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if (err)
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vlan_dev_free_egress_priority(dev);
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return err;
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}
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static inline size_t vlan_qos_map_size(unsigned int n)
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{
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if (n == 0)
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return 0;
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/* IFLA_VLAN_{EGRESS,INGRESS}_QOS + n * IFLA_VLAN_QOS_MAPPING */
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return nla_total_size(sizeof(struct nlattr)) +
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nla_total_size(sizeof(struct ifla_vlan_qos_mapping)) * n;
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}
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static size_t vlan_get_size(const struct net_device *dev)
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{
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struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
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return nla_total_size(2) + /* IFLA_VLAN_PROTOCOL */
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nla_total_size(2) + /* IFLA_VLAN_ID */
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nla_total_size(sizeof(struct ifla_vlan_flags)) + /* IFLA_VLAN_FLAGS */
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vlan_qos_map_size(vlan->nr_ingress_mappings) +
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vlan_qos_map_size(vlan->nr_egress_mappings);
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}
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static int vlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
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{
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struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
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struct vlan_priority_tci_mapping *pm;
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struct ifla_vlan_flags f;
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struct ifla_vlan_qos_mapping m;
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struct nlattr *nest;
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unsigned int i;
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if (nla_put_be16(skb, IFLA_VLAN_PROTOCOL, vlan->vlan_proto) ||
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nla_put_u16(skb, IFLA_VLAN_ID, vlan->vlan_id))
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goto nla_put_failure;
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if (vlan->flags) {
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f.flags = vlan->flags;
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f.mask = ~0;
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if (nla_put(skb, IFLA_VLAN_FLAGS, sizeof(f), &f))
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goto nla_put_failure;
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}
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if (vlan->nr_ingress_mappings) {
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nest = nla_nest_start_noflag(skb, IFLA_VLAN_INGRESS_QOS);
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if (nest == NULL)
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goto nla_put_failure;
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for (i = 0; i < ARRAY_SIZE(vlan->ingress_priority_map); i++) {
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if (!vlan->ingress_priority_map[i])
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continue;
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m.from = i;
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m.to = vlan->ingress_priority_map[i];
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if (nla_put(skb, IFLA_VLAN_QOS_MAPPING,
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sizeof(m), &m))
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goto nla_put_failure;
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}
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nla_nest_end(skb, nest);
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}
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if (vlan->nr_egress_mappings) {
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nest = nla_nest_start_noflag(skb, IFLA_VLAN_EGRESS_QOS);
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if (nest == NULL)
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goto nla_put_failure;
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for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
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for (pm = vlan->egress_priority_map[i]; pm;
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pm = pm->next) {
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if (!pm->vlan_qos)
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continue;
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m.from = pm->priority;
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m.to = (pm->vlan_qos >> 13) & 0x7;
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if (nla_put(skb, IFLA_VLAN_QOS_MAPPING,
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sizeof(m), &m))
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goto nla_put_failure;
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}
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}
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nla_nest_end(skb, nest);
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}
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return 0;
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nla_put_failure:
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return -EMSGSIZE;
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}
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static struct net *vlan_get_link_net(const struct net_device *dev)
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{
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struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
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return dev_net(real_dev);
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}
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struct rtnl_link_ops vlan_link_ops __read_mostly = {
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.kind = "vlan",
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.maxtype = IFLA_VLAN_MAX,
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.policy = vlan_policy,
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.priv_size = sizeof(struct vlan_dev_priv),
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.setup = vlan_setup,
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.validate = vlan_validate,
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.newlink = vlan_newlink,
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.changelink = vlan_changelink,
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.dellink = unregister_vlan_dev,
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.get_size = vlan_get_size,
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.fill_info = vlan_fill_info,
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.get_link_net = vlan_get_link_net,
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};
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int __init vlan_netlink_init(void)
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{
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return rtnl_link_register(&vlan_link_ops);
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}
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void __exit vlan_netlink_fini(void)
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{
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rtnl_link_unregister(&vlan_link_ops);
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}
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MODULE_ALIAS_RTNL_LINK("vlan");
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