net/8021q/vlan.h

   1 #ifndef __BEN_VLAN_802_1Q_INC__
   2 #define __BEN_VLAN_802_1Q_INC__
   3
   4 #include <linux/if_vlan.h>
   5 #include <linux/u64_stats_sync.h>
   6 #include <linux/list.h>
   7
   8 /* if this changes, algorithm will have to be reworked because this
   9  * depends on completely exhausting the VLAN identifier space.  Thus
  10  * it gives constant time look-up, but in many cases it wastes memory.
  11  */
  12 #define VLAN_GROUP_ARRAY_SPLIT_PARTS  8
  13 #define VLAN_GROUP_ARRAY_PART_LEN     (VLAN_N_VID/VLAN_GROUP_ARRAY_SPLIT_PARTS)
  14
  15 enum vlan_protos {
  16         VLAN_PROTO_8021Q        = 0,
  17         VLAN_PROTO_8021AD,
  18         VLAN_PROTO_NUM,
  19 };
  20
  21 struct vlan_group {
  22         unsigned int            nr_vlan_devs;
  23         struct hlist_node       hlist;  /* linked list */
  24         struct net_device **vlan_devices_arrays[VLAN_PROTO_NUM]
  25                                                [VLAN_GROUP_ARRAY_SPLIT_PARTS];
  26 };
  27
  28 struct vlan_info {
  29         struct net_device       *real_dev; /* The ethernet(like) device
  30                                             * the vlan is attached to.
  31                                             */
  32         struct vlan_group       grp;
  33         struct list_head        vid_list;
  34         unsigned int            nr_vids;
  35         struct rcu_head         rcu;
  36 };
  37
  38 static inline unsigned int vlan_proto_idx(__be16 proto)
  39 {
  40         switch (proto) {
  41         case htons(ETH_P_8021Q):
  42                 return VLAN_PROTO_8021Q;
  43         case htons(ETH_P_8021AD):
  44                 return VLAN_PROTO_8021AD;
  45         default:
  46                 BUG();
  47                 return 0;
  48         }
  49 }
  50
  51 static inline struct net_device *__vlan_group_get_device(struct vlan_group *vg,
  52                                                          unsigned int pidx,
  53                                                          u16 vlan_id)
  54 {
  55         struct net_device **array;
  56
  57         array = vg->vlan_devices_arrays[pidx]
  58                                        [vlan_id / VLAN_GROUP_ARRAY_PART_LEN];
  59         return array ? array[vlan_id % VLAN_GROUP_ARRAY_PART_LEN] : NULL;
  60 }
  61
  62 static inline struct net_device *vlan_group_get_device(struct vlan_group *vg,
  63                                                        __be16 vlan_proto,
  64                                                        u16 vlan_id)
  65 {
  66         return __vlan_group_get_device(vg, vlan_proto_idx(vlan_proto), vlan_id);
  67 }
  68
  69 static inline void vlan_group_set_device(struct vlan_group *vg,
  70                                          __be16 vlan_proto, u16 vlan_id,
  71                                          struct net_device *dev)
  72 {
  73         struct net_device **array;
  74         if (!vg)
  75                 return;
  76         array = vg->vlan_devices_arrays[vlan_proto_idx(vlan_proto)]
  77                                        [vlan_id / VLAN_GROUP_ARRAY_PART_LEN];
  78         array[vlan_id % VLAN_GROUP_ARRAY_PART_LEN] = dev;
  79 }
  80
  81 /* Must be invoked with rcu_read_lock or with RTNL. */
  82 static inline struct net_device *vlan_find_dev(struct net_device *real_dev,
  83                                                __be16 vlan_proto, u16 vlan_id)
  84 {
  85         struct vlan_info *vlan_info = rcu_dereference_rtnl(real_dev->vlan_info);
  86
  87         if (vlan_info)
  88                 return vlan_group_get_device(&vlan_info->grp,
  89                                              vlan_proto, vlan_id);
  90
  91         return NULL;
  92 }
  93
  94 #define vlan_group_for_each_dev(grp, i, dev) \
  95         for ((i) = 0; i < VLAN_PROTO_NUM * VLAN_N_VID; i++) \
  96                 if (((dev) = __vlan_group_get_device((grp), (i) / VLAN_N_VID, \
  97                                                             (i) % VLAN_N_VID)))
  98
  99 /* found in vlan_dev.c */
 100 void vlan_dev_set_ingress_priority(const struct net_device *dev,
 101                                    u32 skb_prio, u16 vlan_prio);
 102 int vlan_dev_set_egress_priority(const struct net_device *dev,
 103                                  u32 skb_prio, u16 vlan_prio);
 104 int vlan_dev_change_flags(const struct net_device *dev, u32 flag, u32 mask);
 105 void vlan_dev_get_realdev_name(const struct net_device *dev, char *result);
 106
 107 int vlan_check_real_dev(struct net_device *real_dev,
 108                         __be16 protocol, u16 vlan_id);
 109 void vlan_setup(struct net_device *dev);
 110 int register_vlan_dev(struct net_device *dev);
 111 void unregister_vlan_dev(struct net_device *dev, struct list_head *head);
 112 bool vlan_dev_inherit_address(struct net_device *dev,
 113                               struct net_device *real_dev);
 114
 115 static inline u32 vlan_get_ingress_priority(struct net_device *dev,
 116                                             u16 vlan_tci)
 117 {
 118         struct vlan_dev_priv *vip = vlan_dev_priv(dev);
 119
 120         return vip->ingress_priority_map[(vlan_tci >> VLAN_PRIO_SHIFT) & 0x7];
 121 }
 122
 123 #ifdef CONFIG_VLAN_8021Q_GVRP
 124 int vlan_gvrp_request_join(const struct net_device *dev);
 125 void vlan_gvrp_request_leave(const struct net_device *dev);
 126 int vlan_gvrp_init_applicant(struct net_device *dev);
 127 void vlan_gvrp_uninit_applicant(struct net_device *dev);
 128 int vlan_gvrp_init(void);
 129 void vlan_gvrp_uninit(void);
 130 #else
 131 static inline int vlan_gvrp_request_join(const struct net_device *dev) { return 0; }
 132 static inline void vlan_gvrp_request_leave(const struct net_device *dev) {}
 133 static inline int vlan_gvrp_init_applicant(struct net_device *dev) { return 0; }
 134 static inline void vlan_gvrp_uninit_applicant(struct net_device *dev) {}
 135 static inline int vlan_gvrp_init(void) { return 0; }
 136 static inline void vlan_gvrp_uninit(void) {}
 137 #endif
 138
 139 #ifdef CONFIG_VLAN_8021Q_MVRP
 140 int vlan_mvrp_request_join(const struct net_device *dev);
 141 void vlan_mvrp_request_leave(const struct net_device *dev);
 142 int vlan_mvrp_init_applicant(struct net_device *dev);
 143 void vlan_mvrp_uninit_applicant(struct net_device *dev);
 144 int vlan_mvrp_init(void);
 145 void vlan_mvrp_uninit(void);
 146 #else
 147 static inline int vlan_mvrp_request_join(const struct net_device *dev) { return 0; }
 148 static inline void vlan_mvrp_request_leave(const struct net_device *dev) {}
 149 static inline int vlan_mvrp_init_applicant(struct net_device *dev) { return 0; }
 150 static inline void vlan_mvrp_uninit_applicant(struct net_device *dev) {}
 151 static inline int vlan_mvrp_init(void) { return 0; }
 152 static inline void vlan_mvrp_uninit(void) {}
 153 #endif
 154
 155 extern const char vlan_fullname[];
 156 extern const char vlan_version[];
 157 int vlan_netlink_init(void);
 158 void vlan_netlink_fini(void);
 159
 160 extern struct rtnl_link_ops vlan_link_ops;
 161
 162 extern int vlan_net_id;
 163
 164 struct proc_dir_entry;
 165
 166 struct vlan_net {
 167         /* /proc/net/vlan */
 168         struct proc_dir_entry *proc_vlan_dir;
 169         /* /proc/net/vlan/config */
 170         struct proc_dir_entry *proc_vlan_conf;
 171         /* Determines interface naming scheme. */
 172         unsigned short name_type;
 173 };
 174
 175 #endif /* !(__BEN_VLAN_802_1Q_INC__) */