[VLAN]: Use rtnl_link API

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

4 files changed, 266 insertions, 11 deletions

diff --git a/net/8021q/Makefile b/net/8021q/Makefile
index 97feb44dbdce..10ca7f486c3a 100644
--- a/net/8021q/Makefile
+++ b/net/8021q/Makefile
@@ -4,7 +4,7 @@
 
 obj-$(CONFIG_VLAN_8021Q) += 8021q.o
 
-8021q-objs := vlan.o vlan_dev.o
+8021q-objs := vlan.o vlan_dev.o vlan_netlink.o
 
 ifeq ($(CONFIG_PROC_FS),y)
 8021q-objs += vlanproc.o
diff --git a/net/8021q/vlan.c b/net/8021q/vlan.c
index f12f914edf02..e7583eea6fda 100644
--- a/net/8021q/vlan.c
+++ b/net/8021q/vlan.c
@@ -97,15 +97,22 @@ static int __init vlan_proto_init(void)
 
         /* Register us to receive netdevice events */
         err = register_netdevice_notifier(&vlan_notifier_block);
-        if (err < 0) {
-                dev_remove_pack(&vlan_packet_type);
-                vlan_proc_cleanup();
-                return err;
-        }
+        if (err < 0)
+                goto err1;
 
-        vlan_ioctl_set(vlan_ioctl_handler);
+        err = vlan_netlink_init();
+        if (err < 0)
+                goto err2;
 
+        vlan_ioctl_set(vlan_ioctl_handler);
         return 0;
+
+err2:
+        unregister_netdevice_notifier(&vlan_notifier_block);
+err1:
+        vlan_proc_cleanup();
+        dev_remove_pack(&vlan_packet_type);
+        return err;
 }
 
 /* Cleanup all vlan devices
@@ -136,6 +143,7 @@ static void __exit vlan_cleanup_module(void)
 {
         int i;
 
+        vlan_netlink_fini();
         vlan_ioctl_set(NULL);
 
         /* Un-register us from receiving netdevice events */
@@ -306,7 +314,7 @@ static int unregister_vlan_dev(struct net_device *real_dev,
         return ret;
 }
 
-static int unregister_vlan_device(struct net_device *dev)
+int unregister_vlan_device(struct net_device *dev)
 {
         int ret;
 
@@ -361,7 +369,7 @@ static int vlan_dev_init(struct net_device *dev)
         return 0;
 }
 
-static void vlan_setup(struct net_device *new_dev)
+void vlan_setup(struct net_device *new_dev)
 {
         SET_MODULE_OWNER(new_dev);
 
@@ -410,7 +418,7 @@ static void vlan_transfer_operstate(const struct net_device *dev, struct net_dev
         }
 }
 
-static int vlan_check_real_dev(struct net_device *real_dev, unsigned short vlan_id)
+int vlan_check_real_dev(struct net_device *real_dev, unsigned short vlan_id)
 {
         if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
                 printk(VLAN_DBG "%s: VLANs not supported on %s.\n",
@@ -447,7 +455,7 @@ static int vlan_check_real_dev(struct net_device *real_dev, unsigned short vlan_
         return 0;
 }
 
-static int register_vlan_dev(struct net_device *dev)
+int register_vlan_dev(struct net_device *dev)
 {
         struct vlan_dev_info *vlan = VLAN_DEV_INFO(dev);
         struct net_device *real_dev = vlan->real_dev;
@@ -567,6 +575,7 @@ static int register_vlan_device(struct net_device *real_dev,
         VLAN_DEV_INFO(new_dev)->dent = NULL;
         VLAN_DEV_INFO(new_dev)->flags = VLAN_FLAG_REORDER_HDR;
 
+        new_dev->rtnl_link_ops = &vlan_link_ops;
         err = register_vlan_dev(new_dev);
         if (err < 0)
                 goto out_free_newdev;
diff --git a/net/8021q/vlan.h b/net/8021q/vlan.h
index b83739017e9d..fe6bb0f7d275 100644
--- a/net/8021q/vlan.h
+++ b/net/8021q/vlan.h
@@ -72,4 +72,14 @@ void vlan_dev_get_realdev_name(const struct net_device *dev, char *result);
 void vlan_dev_get_vid(const struct net_device *dev, unsigned short *result);
 void vlan_dev_set_multicast_list(struct net_device *vlan_dev);
 
+int vlan_check_real_dev(struct net_device *real_dev, unsigned short vlan_id);
+void vlan_setup(struct net_device *dev);
+int register_vlan_dev(struct net_device *dev);
+int unregister_vlan_device(struct net_device *dev);
+
+int vlan_netlink_init(void);
+void vlan_netlink_fini(void);
+
+extern struct rtnl_link_ops vlan_link_ops;
+
 #endif /* !(__BEN_VLAN_802_1Q_INC__) */
diff --git a/net/8021q/vlan_netlink.c b/net/8021q/vlan_netlink.c
new file mode 100644
index 000000000000..844c7e43d0fa
--- /dev/null
+++ b/net/8021q/vlan_netlink.c
@@ -0,0 +1,236 @@
+/*
+ *      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 <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 },
+};
+
+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);
+}
+
+static int vlan_validate(struct nlattr *tb[], struct nlattr *data[])
+{
+        struct ifla_vlan_flags *flags;
+        u16 id;
+        int err;
+
+        if (!data)
+                return -EINVAL;
+
+        if (data[IFLA_VLAN_ID]) {
+                id = nla_get_u16(data[IFLA_VLAN_ID]);
+                if (id >= VLAN_VID_MASK)
+                        return -ERANGE;
+        }
+        if (data[IFLA_VLAN_FLAGS]) {
+                flags = nla_data(data[IFLA_VLAN_FLAGS]);
+                if ((flags->flags & flags->mask) & ~VLAN_FLAG_REORDER_HDR)
+                        return -EINVAL;
+        }
+
+        err = vlan_validate_qos_map(data[IFLA_VLAN_INGRESS_QOS]);
+        if (err < 0)
+                return err;
+        err = vlan_validate_qos_map(data[IFLA_VLAN_EGRESS_QOS]);
+        if (err < 0)
+                return err;
+        return 0;
+}
+
+static int vlan_changelink(struct net_device *dev,
+                           struct nlattr *tb[], struct nlattr *data[])
+{
+        struct vlan_dev_info *vlan = VLAN_DEV_INFO(dev);
+        struct ifla_vlan_flags *flags;
+        struct ifla_vlan_qos_mapping *m;
+        struct nlattr *attr;
+        int rem;
+
+        if (data[IFLA_VLAN_FLAGS]) {
+                flags = nla_data(data[IFLA_VLAN_FLAGS]);
+                vlan->flags = (vlan->flags & ~flags->mask) |
+                              (flags->flags & flags->mask);
+        }
+        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);
+                        vlan_dev_set_egress_priority(dev, m->from, m->to);
+                }
+        }
+        return 0;
+}
+
+static int vlan_newlink(struct net_device *dev,
+                        struct nlattr *tb[], struct nlattr *data[])
+{
+        struct vlan_dev_info *vlan = VLAN_DEV_INFO(dev);
+        struct net_device *real_dev;
+        int err;
+
+        if (!data[IFLA_VLAN_ID])
+                return -EINVAL;
+
+        if (!tb[IFLA_LINK])
+                return -EINVAL;
+        real_dev = __dev_get_by_index(nla_get_u32(tb[IFLA_LINK]));
+        if (!real_dev)
+                return -ENODEV;
+
+        vlan->vlan_id  = nla_get_u16(data[IFLA_VLAN_ID]);
+        vlan->real_dev = real_dev;
+        vlan->flags    = VLAN_FLAG_REORDER_HDR;
+
+        err = vlan_check_real_dev(real_dev, vlan->vlan_id);
+        if (err < 0)
+                return err;
+
+        if (!tb[IFLA_MTU])
+                dev->mtu = real_dev->mtu;
+        else if (dev->mtu > real_dev->mtu)
+                return -EINVAL;
+
+        err = vlan_changelink(dev, tb, data);
+        if (err < 0)
+                return err;
+
+        return register_vlan_dev(dev);
+}
+
+static void vlan_dellink(struct net_device *dev)
+{
+        unregister_vlan_device(dev);
+}
+
+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_info *vlan = VLAN_DEV_INFO(dev);
+
+        return nla_total_size(2) +      /* IFLA_VLAN_ID */
+               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_info *vlan = VLAN_DEV_INFO(dev);
+        struct vlan_priority_tci_mapping *pm;
+        struct ifla_vlan_flags f;
+        struct ifla_vlan_qos_mapping m;
+        struct nlattr *nest;
+        unsigned int i;
+
+        NLA_PUT_U16(skb, IFLA_VLAN_ID, VLAN_DEV_INFO(dev)->vlan_id);
+        if (vlan->flags) {
+                f.flags = vlan->flags;
+                f.mask  = ~0;
+                NLA_PUT(skb, IFLA_VLAN_FLAGS, sizeof(f), &f);
+        }
+        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];
+                        NLA_PUT(skb, IFLA_VLAN_QOS_MAPPING,
+                                sizeof(m), &m);
+                }
+                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;
+                                NLA_PUT(skb, IFLA_VLAN_QOS_MAPPING,
+                                        sizeof(m), &m);
+                        }
+                }
+                nla_nest_end(skb, nest);
+        }
+        return 0;
+
+nla_put_failure:
+        return -EMSGSIZE;
+}
+
+struct rtnl_link_ops vlan_link_ops __read_mostly = {
+        .kind           = "vlan",
+        .maxtype        = IFLA_VLAN_MAX,
+        .policy         = vlan_policy,
+        .priv_size      = sizeof(struct vlan_dev_info),
+        .setup          = vlan_setup,
+        .validate       = vlan_validate,
+        .newlink        = vlan_newlink,
+        .changelink     = vlan_changelink,
+        .dellink        = vlan_dellink,
+        .get_size       = vlan_get_size,
+        .fill_info      = vlan_fill_info,
+};
+
+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");