--- /dev/null
+#include <linux/skbuff.h>
+#include <linux/netdevice.h>
+#include <linux/if_vlan.h>
+#include <linux/netpoll.h>
+#include <linux/export.h>
+#include "vlan.h"
+
+bool vlan_do_receive(struct sk_buff **skbp)
+{
+ struct sk_buff *skb = *skbp;
+ __be16 vlan_proto = skb->vlan_proto;
+ u16 vlan_id = skb_vlan_tag_get_id(skb);
+ struct net_device *vlan_dev;
+ struct vlan_pcpu_stats *rx_stats;
+
+ vlan_dev = vlan_find_dev(skb->dev, vlan_proto, vlan_id);
+ if (!vlan_dev)
+ return false;
+
+ skb = *skbp = skb_share_check(skb, GFP_ATOMIC);
+ if (unlikely(!skb))
+ return false;
+
+ skb->dev = vlan_dev;
+ if (unlikely(skb->pkt_type == PACKET_OTHERHOST)) {
+ /* Our lower layer thinks this is not local, let's make sure.
+ * This allows the VLAN to have a different MAC than the
+ * underlying device, and still route correctly. */
+ if (ether_addr_equal_64bits(eth_hdr(skb)->h_dest, vlan_dev->dev_addr))
+ skb->pkt_type = PACKET_HOST;
+ }
+
+ if (!(vlan_dev_priv(vlan_dev)->flags & VLAN_FLAG_REORDER_HDR)) {
+ unsigned int offset = skb->data - skb_mac_header(skb);
+
+ /*
+ * vlan_insert_tag expect skb->data pointing to mac header.
+ * So change skb->data before calling it and change back to
+ * original position later
+ */
+ skb_push(skb, offset);
+ skb = *skbp = vlan_insert_tag(skb, skb->vlan_proto,
+ skb->vlan_tci);
+ if (!skb)
+ return false;
+ skb_pull(skb, offset + VLAN_HLEN);
+ skb_reset_mac_len(skb);
+ }
+
+ skb->priority = vlan_get_ingress_priority(vlan_dev, skb->vlan_tci);
+ skb->vlan_tci = 0;
+
+ rx_stats = this_cpu_ptr(vlan_dev_priv(vlan_dev)->vlan_pcpu_stats);
+
+ u64_stats_update_begin(&rx_stats->syncp);
+ rx_stats->rx_packets++;
+ rx_stats->rx_bytes += skb->len;
+ if (skb->pkt_type == PACKET_MULTICAST)
+ rx_stats->rx_multicast++;
+ u64_stats_update_end(&rx_stats->syncp);
+
+ return true;
+}
+
+/* Must be invoked with rcu_read_lock. */
+struct net_device *__vlan_find_dev_deep_rcu(struct net_device *dev,
+ __be16 vlan_proto, u16 vlan_id)
+{
+ struct vlan_info *vlan_info = rcu_dereference(dev->vlan_info);
+
+ if (vlan_info) {
+ return vlan_group_get_device(&vlan_info->grp,
+ vlan_proto, vlan_id);
+ } else {
+ /*
+ * Lower devices of master uppers (bonding, team) do not have
+ * grp assigned to themselves. Grp is assigned to upper device
+ * instead.
+ */
+ struct net_device *upper_dev;
+
+ upper_dev = netdev_master_upper_dev_get_rcu(dev);
+ if (upper_dev)
+ return __vlan_find_dev_deep_rcu(upper_dev,
+ vlan_proto, vlan_id);
+ }
+
+ return NULL;
+}
+EXPORT_SYMBOL(__vlan_find_dev_deep_rcu);
+
+struct net_device *vlan_dev_real_dev(const struct net_device *dev)
+{
+ struct net_device *ret = vlan_dev_priv(dev)->real_dev;
+
+ while (is_vlan_dev(ret))
+ ret = vlan_dev_priv(ret)->real_dev;
+
+ return ret;
+}
+EXPORT_SYMBOL(vlan_dev_real_dev);
+
+u16 vlan_dev_vlan_id(const struct net_device *dev)
+{
+ return vlan_dev_priv(dev)->vlan_id;
+}
+EXPORT_SYMBOL(vlan_dev_vlan_id);
+
+__be16 vlan_dev_vlan_proto(const struct net_device *dev)
+{
+ return vlan_dev_priv(dev)->vlan_proto;
+}
+EXPORT_SYMBOL(vlan_dev_vlan_proto);
+
+/*
+ * vlan info and vid list
+ */
+
+static void vlan_group_free(struct vlan_group *grp)
+{
+ int i, j;
+
+ for (i = 0; i < VLAN_PROTO_NUM; i++)
+ for (j = 0; j < VLAN_GROUP_ARRAY_SPLIT_PARTS; j++)
+ kfree(grp->vlan_devices_arrays[i][j]);
+}
+
+static void vlan_info_free(struct vlan_info *vlan_info)
+{
+ vlan_group_free(&vlan_info->grp);
+ kfree(vlan_info);
+}
+
+static void vlan_info_rcu_free(struct rcu_head *rcu)
+{
+ vlan_info_free(container_of(rcu, struct vlan_info, rcu));
+}
+
+static struct vlan_info *vlan_info_alloc(struct net_device *dev)
+{
+ struct vlan_info *vlan_info;
+
+ vlan_info = kzalloc(sizeof(struct vlan_info), GFP_KERNEL);
+ if (!vlan_info)
+ return NULL;
+
+ vlan_info->real_dev = dev;
+ INIT_LIST_HEAD(&vlan_info->vid_list);
+ return vlan_info;
+}
+
+struct vlan_vid_info {
+ struct list_head list;
+ __be16 proto;
+ u16 vid;
+ int refcount;
+};
+
+static bool vlan_hw_filter_capable(const struct net_device *dev,
+ const struct vlan_vid_info *vid_info)
+{
+ if (vid_info->proto == htons(ETH_P_8021Q) &&
+ dev->features & NETIF_F_HW_VLAN_CTAG_FILTER)
+ return true;
+ if (vid_info->proto == htons(ETH_P_8021AD) &&
+ dev->features & NETIF_F_HW_VLAN_STAG_FILTER)
+ return true;
+ return false;
+}
+
+static struct vlan_vid_info *vlan_vid_info_get(struct vlan_info *vlan_info,
+ __be16 proto, u16 vid)
+{
+ struct vlan_vid_info *vid_info;
+
+ list_for_each_entry(vid_info, &vlan_info->vid_list, list) {
+ if (vid_info->proto == proto && vid_info->vid == vid)
+ return vid_info;
+ }
+ return NULL;
+}
+
+static struct vlan_vid_info *vlan_vid_info_alloc(__be16 proto, u16 vid)
+{
+ struct vlan_vid_info *vid_info;
+
+ vid_info = kzalloc(sizeof(struct vlan_vid_info), GFP_KERNEL);
+ if (!vid_info)
+ return NULL;
+ vid_info->proto = proto;
+ vid_info->vid = vid;
+
+ return vid_info;
+}
+
+static int __vlan_vid_add(struct vlan_info *vlan_info, __be16 proto, u16 vid,
+ struct vlan_vid_info **pvid_info)
+{
+ struct net_device *dev = vlan_info->real_dev;
+ const struct net_device_ops *ops = dev->netdev_ops;
+ struct vlan_vid_info *vid_info;
+ int err;
+
+ vid_info = vlan_vid_info_alloc(proto, vid);
+ if (!vid_info)
+ return -ENOMEM;
+
+ if (vlan_hw_filter_capable(dev, vid_info)) {
+ err = ops->ndo_vlan_rx_add_vid(dev, proto, vid);
+ if (err) {
+ kfree(vid_info);
+ return err;
+ }
+ }
+ list_add(&vid_info->list, &vlan_info->vid_list);
+ vlan_info->nr_vids++;
+ *pvid_info = vid_info;
+ return 0;
+}
+
+int vlan_vid_add(struct net_device *dev, __be16 proto, u16 vid)
+{
+ struct vlan_info *vlan_info;
+ struct vlan_vid_info *vid_info;
+ bool vlan_info_created = false;
+ int err;
+
+ ASSERT_RTNL();
+
+ vlan_info = rtnl_dereference(dev->vlan_info);
+ if (!vlan_info) {
+ vlan_info = vlan_info_alloc(dev);
+ if (!vlan_info)
+ return -ENOMEM;
+ vlan_info_created = true;
+ }
+ vid_info = vlan_vid_info_get(vlan_info, proto, vid);
+ if (!vid_info) {
+ err = __vlan_vid_add(vlan_info, proto, vid, &vid_info);
+ if (err)
+ goto out_free_vlan_info;
+ }
+ vid_info->refcount++;
+
+ if (vlan_info_created)
+ rcu_assign_pointer(dev->vlan_info, vlan_info);
+
+ return 0;
+
+out_free_vlan_info:
+ if (vlan_info_created)
+ kfree(vlan_info);
+ return err;
+}
+EXPORT_SYMBOL(vlan_vid_add);
+
+static void __vlan_vid_del(struct vlan_info *vlan_info,
+ struct vlan_vid_info *vid_info)
+{
+ struct net_device *dev = vlan_info->real_dev;
+ const struct net_device_ops *ops = dev->netdev_ops;
+ __be16 proto = vid_info->proto;
+ u16 vid = vid_info->vid;
+ int err;
+
+ if (vlan_hw_filter_capable(dev, vid_info)) {
+ err = ops->ndo_vlan_rx_kill_vid(dev, proto, vid);
+ if (err) {
+ pr_warn("failed to kill vid %04x/%d for device %s\n",
+ proto, vid, dev->name);
+ }
+ }
+ list_del(&vid_info->list);
+ kfree(vid_info);
+ vlan_info->nr_vids--;
+}
+
+void vlan_vid_del(struct net_device *dev, __be16 proto, u16 vid)
+{
+ struct vlan_info *vlan_info;
+ struct vlan_vid_info *vid_info;
+
+ ASSERT_RTNL();
+
+ vlan_info = rtnl_dereference(dev->vlan_info);
+ if (!vlan_info)
+ return;
+
+ vid_info = vlan_vid_info_get(vlan_info, proto, vid);
+ if (!vid_info)
+ return;
+ vid_info->refcount--;
+ if (vid_info->refcount == 0) {
+ __vlan_vid_del(vlan_info, vid_info);
+ if (vlan_info->nr_vids == 0) {
+ RCU_INIT_POINTER(dev->vlan_info, NULL);
+ call_rcu(&vlan_info->rcu, vlan_info_rcu_free);
+ }
+ }
+}
+EXPORT_SYMBOL(vlan_vid_del);
+
+int vlan_vids_add_by_dev(struct net_device *dev,
+ const struct net_device *by_dev)
+{
+ struct vlan_vid_info *vid_info;
+ struct vlan_info *vlan_info;
+ int err;
+
+ ASSERT_RTNL();
+
+ vlan_info = rtnl_dereference(by_dev->vlan_info);
+ if (!vlan_info)
+ return 0;
+
+ list_for_each_entry(vid_info, &vlan_info->vid_list, list) {
+ err = vlan_vid_add(dev, vid_info->proto, vid_info->vid);
+ if (err)
+ goto unwind;
+ }
+ return 0;
+
+unwind:
+ list_for_each_entry_continue_reverse(vid_info,
+ &vlan_info->vid_list,
+ list) {
+ vlan_vid_del(dev, vid_info->proto, vid_info->vid);
+ }
+
+ return err;
+}
+EXPORT_SYMBOL(vlan_vids_add_by_dev);
+
+void vlan_vids_del_by_dev(struct net_device *dev,
+ const struct net_device *by_dev)
+{
+ struct vlan_vid_info *vid_info;
+ struct vlan_info *vlan_info;
+
+ ASSERT_RTNL();
+
+ vlan_info = rtnl_dereference(by_dev->vlan_info);
+ if (!vlan_info)
+ return;
+
+ list_for_each_entry(vid_info, &vlan_info->vid_list, list)
+ vlan_vid_del(dev, vid_info->proto, vid_info->vid);
+}
+EXPORT_SYMBOL(vlan_vids_del_by_dev);
+
+bool vlan_uses_dev(const struct net_device *dev)
+{
+ struct vlan_info *vlan_info;
+
+ ASSERT_RTNL();
+
+ vlan_info = rtnl_dereference(dev->vlan_info);
+ if (!vlan_info)
+ return false;
+ return vlan_info->grp.nr_vlan_devs ? true : false;
+}
+EXPORT_SYMBOL(vlan_uses_dev);
Code Review / kvmfornfv.git / blobdiff