246 lines
6.0 KiB
C
246 lines
6.0 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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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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};
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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(attr, IFLA_VLAN_QOS_MAX, vlan_map_policy);
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}
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static int vlan_validate(struct nlattr *tb[], struct nlattr *data[])
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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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return -EINVAL;
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if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
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return -EADDRNOTAVAIL;
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}
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if (!data)
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return -EINVAL;
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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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return -ERANGE;
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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))
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return -EINVAL;
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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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return err;
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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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return err;
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return 0;
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}
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static int vlan_changelink(struct net_device *dev,
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struct nlattr *tb[], struct nlattr *data[])
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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;
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if (data[IFLA_VLAN_FLAGS]) {
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flags = nla_data(data[IFLA_VLAN_FLAGS]);
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vlan_dev_change_flags(dev, flags->flags, flags->mask);
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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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vlan_dev_set_egress_priority(dev, m->from, m->to);
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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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{
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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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int err;
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if (!data[IFLA_VLAN_ID])
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return -EINVAL;
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if (!tb[IFLA_LINK])
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return -EINVAL;
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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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return -ENODEV;
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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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vlan->flags = VLAN_FLAG_REORDER_HDR;
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err = vlan_check_real_dev(real_dev, vlan->vlan_id);
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if (err < 0)
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return err;
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if (!tb[IFLA_MTU])
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dev->mtu = real_dev->mtu;
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else if (dev->mtu > real_dev->mtu)
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return -EINVAL;
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err = vlan_changelink(dev, tb, data);
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if (err < 0)
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return err;
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return register_vlan_dev(dev);
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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_ID */
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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_u16(skb, IFLA_VLAN_ID, vlan_dev_priv(dev)->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(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(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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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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};
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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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