379 lines
8.4 KiB
C
379 lines
8.4 KiB
C
#include <linux/skbuff.h>
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#include <linux/netdevice.h>
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#include <linux/if_vlan.h>
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#include <linux/netpoll.h>
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#include <linux/export.h>
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#include "vlan.h"
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bool vlan_do_receive(struct sk_buff **skbp)
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{
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struct sk_buff *skb = *skbp;
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u16 vlan_id = skb->vlan_tci & VLAN_VID_MASK;
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struct net_device *vlan_dev;
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struct vlan_pcpu_stats *rx_stats;
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vlan_dev = vlan_find_dev(skb->dev, vlan_id);
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if (!vlan_dev)
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return false;
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skb = *skbp = skb_share_check(skb, GFP_ATOMIC);
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if (unlikely(!skb))
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return false;
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skb->dev = vlan_dev;
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if (skb->pkt_type == PACKET_OTHERHOST) {
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/* Our lower layer thinks this is not local, let's make sure.
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* This allows the VLAN to have a different MAC than the
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* underlying device, and still route correctly. */
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if (ether_addr_equal(eth_hdr(skb)->h_dest, vlan_dev->dev_addr))
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skb->pkt_type = PACKET_HOST;
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}
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if (!(vlan_dev_priv(vlan_dev)->flags & VLAN_FLAG_REORDER_HDR)) {
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unsigned int offset = skb->data - skb_mac_header(skb);
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/*
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* vlan_insert_tag expect skb->data pointing to mac header.
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* So change skb->data before calling it and change back to
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* original position later
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*/
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skb_push(skb, offset);
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skb = *skbp = vlan_insert_tag(skb, skb->vlan_tci);
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if (!skb)
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return false;
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skb_pull(skb, offset + VLAN_HLEN);
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skb_reset_mac_len(skb);
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}
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skb->priority = vlan_get_ingress_priority(vlan_dev, skb->vlan_tci);
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skb->vlan_tci = 0;
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rx_stats = this_cpu_ptr(vlan_dev_priv(vlan_dev)->vlan_pcpu_stats);
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u64_stats_update_begin(&rx_stats->syncp);
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rx_stats->rx_packets++;
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rx_stats->rx_bytes += skb->len;
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if (skb->pkt_type == PACKET_MULTICAST)
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rx_stats->rx_multicast++;
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u64_stats_update_end(&rx_stats->syncp);
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return true;
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}
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/* Must be invoked with rcu_read_lock or with RTNL. */
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struct net_device *__vlan_find_dev_deep(struct net_device *real_dev,
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u16 vlan_id)
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{
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struct vlan_info *vlan_info = rcu_dereference_rtnl(real_dev->vlan_info);
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if (vlan_info) {
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return vlan_group_get_device(&vlan_info->grp, vlan_id);
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} else {
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/*
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* Bonding slaves do not have grp assigned to themselves.
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* Grp is assigned to bonding master instead.
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*/
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if (netif_is_bond_slave(real_dev))
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return __vlan_find_dev_deep(real_dev->master, vlan_id);
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}
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return NULL;
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}
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EXPORT_SYMBOL(__vlan_find_dev_deep);
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struct net_device *vlan_dev_real_dev(const struct net_device *dev)
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{
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return vlan_dev_priv(dev)->real_dev;
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}
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EXPORT_SYMBOL(vlan_dev_real_dev);
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u16 vlan_dev_vlan_id(const struct net_device *dev)
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{
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return vlan_dev_priv(dev)->vlan_id;
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}
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EXPORT_SYMBOL(vlan_dev_vlan_id);
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static struct sk_buff *vlan_reorder_header(struct sk_buff *skb)
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{
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if (skb_cow(skb, skb_headroom(skb)) < 0)
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return NULL;
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memmove(skb->data - ETH_HLEN, skb->data - VLAN_ETH_HLEN, 2 * ETH_ALEN);
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skb->mac_header += VLAN_HLEN;
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return skb;
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}
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struct sk_buff *vlan_untag(struct sk_buff *skb)
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{
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struct vlan_hdr *vhdr;
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u16 vlan_tci;
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if (unlikely(vlan_tx_tag_present(skb))) {
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/* vlan_tci is already set-up so leave this for another time */
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return skb;
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}
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skb = skb_share_check(skb, GFP_ATOMIC);
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if (unlikely(!skb))
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goto err_free;
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if (unlikely(!pskb_may_pull(skb, VLAN_HLEN)))
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goto err_free;
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vhdr = (struct vlan_hdr *) skb->data;
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vlan_tci = ntohs(vhdr->h_vlan_TCI);
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__vlan_hwaccel_put_tag(skb, vlan_tci);
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skb_pull_rcsum(skb, VLAN_HLEN);
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vlan_set_encap_proto(skb, vhdr);
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skb = vlan_reorder_header(skb);
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if (unlikely(!skb))
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goto err_free;
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skb_reset_network_header(skb);
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skb_reset_transport_header(skb);
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skb_reset_mac_len(skb);
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return skb;
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err_free:
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kfree_skb(skb);
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return NULL;
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}
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/*
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* vlan info and vid list
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*/
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static void vlan_group_free(struct vlan_group *grp)
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{
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int i;
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for (i = 0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++)
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kfree(grp->vlan_devices_arrays[i]);
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}
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static void vlan_info_free(struct vlan_info *vlan_info)
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{
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vlan_group_free(&vlan_info->grp);
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kfree(vlan_info);
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}
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static void vlan_info_rcu_free(struct rcu_head *rcu)
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{
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vlan_info_free(container_of(rcu, struct vlan_info, rcu));
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}
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static struct vlan_info *vlan_info_alloc(struct net_device *dev)
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{
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struct vlan_info *vlan_info;
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vlan_info = kzalloc(sizeof(struct vlan_info), GFP_KERNEL);
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if (!vlan_info)
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return NULL;
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vlan_info->real_dev = dev;
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INIT_LIST_HEAD(&vlan_info->vid_list);
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return vlan_info;
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}
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struct vlan_vid_info {
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struct list_head list;
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unsigned short vid;
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int refcount;
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};
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static struct vlan_vid_info *vlan_vid_info_get(struct vlan_info *vlan_info,
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unsigned short vid)
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{
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struct vlan_vid_info *vid_info;
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list_for_each_entry(vid_info, &vlan_info->vid_list, list) {
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if (vid_info->vid == vid)
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return vid_info;
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}
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return NULL;
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}
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static struct vlan_vid_info *vlan_vid_info_alloc(unsigned short vid)
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{
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struct vlan_vid_info *vid_info;
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vid_info = kzalloc(sizeof(struct vlan_vid_info), GFP_KERNEL);
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if (!vid_info)
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return NULL;
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vid_info->vid = vid;
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return vid_info;
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}
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static int __vlan_vid_add(struct vlan_info *vlan_info, unsigned short vid,
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struct vlan_vid_info **pvid_info)
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{
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struct net_device *dev = vlan_info->real_dev;
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const struct net_device_ops *ops = dev->netdev_ops;
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struct vlan_vid_info *vid_info;
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int err;
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vid_info = vlan_vid_info_alloc(vid);
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if (!vid_info)
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return -ENOMEM;
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if ((dev->features & NETIF_F_HW_VLAN_FILTER) &&
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ops->ndo_vlan_rx_add_vid) {
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err = ops->ndo_vlan_rx_add_vid(dev, vid);
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if (err) {
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kfree(vid_info);
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return err;
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}
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}
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list_add(&vid_info->list, &vlan_info->vid_list);
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vlan_info->nr_vids++;
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*pvid_info = vid_info;
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return 0;
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}
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int vlan_vid_add(struct net_device *dev, unsigned short vid)
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{
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struct vlan_info *vlan_info;
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struct vlan_vid_info *vid_info;
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bool vlan_info_created = false;
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int err;
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ASSERT_RTNL();
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vlan_info = rtnl_dereference(dev->vlan_info);
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if (!vlan_info) {
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vlan_info = vlan_info_alloc(dev);
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if (!vlan_info)
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return -ENOMEM;
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vlan_info_created = true;
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}
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vid_info = vlan_vid_info_get(vlan_info, vid);
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if (!vid_info) {
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err = __vlan_vid_add(vlan_info, vid, &vid_info);
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if (err)
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goto out_free_vlan_info;
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}
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vid_info->refcount++;
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if (vlan_info_created)
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rcu_assign_pointer(dev->vlan_info, vlan_info);
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return 0;
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out_free_vlan_info:
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if (vlan_info_created)
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kfree(vlan_info);
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return err;
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}
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EXPORT_SYMBOL(vlan_vid_add);
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static void __vlan_vid_del(struct vlan_info *vlan_info,
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struct vlan_vid_info *vid_info)
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{
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struct net_device *dev = vlan_info->real_dev;
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const struct net_device_ops *ops = dev->netdev_ops;
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unsigned short vid = vid_info->vid;
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int err;
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if ((dev->features & NETIF_F_HW_VLAN_FILTER) &&
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ops->ndo_vlan_rx_kill_vid) {
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err = ops->ndo_vlan_rx_kill_vid(dev, vid);
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if (err) {
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pr_warn("failed to kill vid %d for device %s\n",
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vid, dev->name);
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}
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}
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list_del(&vid_info->list);
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kfree(vid_info);
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vlan_info->nr_vids--;
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}
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void vlan_vid_del(struct net_device *dev, unsigned short vid)
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{
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struct vlan_info *vlan_info;
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struct vlan_vid_info *vid_info;
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ASSERT_RTNL();
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vlan_info = rtnl_dereference(dev->vlan_info);
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if (!vlan_info)
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return;
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vid_info = vlan_vid_info_get(vlan_info, vid);
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if (!vid_info)
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return;
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vid_info->refcount--;
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if (vid_info->refcount == 0) {
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__vlan_vid_del(vlan_info, vid_info);
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if (vlan_info->nr_vids == 0) {
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RCU_INIT_POINTER(dev->vlan_info, NULL);
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call_rcu(&vlan_info->rcu, vlan_info_rcu_free);
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}
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}
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}
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EXPORT_SYMBOL(vlan_vid_del);
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int vlan_vids_add_by_dev(struct net_device *dev,
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const struct net_device *by_dev)
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{
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struct vlan_vid_info *vid_info;
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struct vlan_info *vlan_info;
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int err;
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ASSERT_RTNL();
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vlan_info = rtnl_dereference(by_dev->vlan_info);
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if (!vlan_info)
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return 0;
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list_for_each_entry(vid_info, &vlan_info->vid_list, list) {
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err = vlan_vid_add(dev, vid_info->vid);
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if (err)
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goto unwind;
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}
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return 0;
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unwind:
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list_for_each_entry_continue_reverse(vid_info,
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&vlan_info->vid_list,
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list) {
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vlan_vid_del(dev, vid_info->vid);
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}
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return err;
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}
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EXPORT_SYMBOL(vlan_vids_add_by_dev);
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void vlan_vids_del_by_dev(struct net_device *dev,
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const struct net_device *by_dev)
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{
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struct vlan_vid_info *vid_info;
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struct vlan_info *vlan_info;
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ASSERT_RTNL();
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vlan_info = rtnl_dereference(by_dev->vlan_info);
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if (!vlan_info)
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return;
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list_for_each_entry(vid_info, &vlan_info->vid_list, list)
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vlan_vid_del(dev, vid_info->vid);
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}
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EXPORT_SYMBOL(vlan_vids_del_by_dev);
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bool vlan_uses_dev(const struct net_device *dev)
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{
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struct vlan_info *vlan_info;
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ASSERT_RTNL();
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vlan_info = rtnl_dereference(dev->vlan_info);
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if (!vlan_info)
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return false;
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return vlan_info->grp.nr_vlan_devs ? true : false;
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}
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EXPORT_SYMBOL(vlan_uses_dev);
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