1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef __BEN_VLAN_802_1Q_INC__ 3 #define __BEN_VLAN_802_1Q_INC__ 4 5 #include <linux/if_vlan.h> 6 #include <linux/u64_stats_sync.h> 7 #include <linux/list.h> 8 9 /* if this changes, algorithm will have to be reworked because this 10 * depends on completely exhausting the VLAN identifier space. Thus 11 * it gives constant time look-up, but in many cases it wastes memory. 12 */ 13 #define VLAN_GROUP_ARRAY_SPLIT_PARTS 8 14 #define VLAN_GROUP_ARRAY_PART_LEN (VLAN_N_VID/VLAN_GROUP_ARRAY_SPLIT_PARTS) 15 16 enum vlan_protos { 17 VLAN_PROTO_8021Q = 0, 18 VLAN_PROTO_8021AD, 19 VLAN_PROTO_NUM, 20 }; 21 22 struct vlan_group { 23 unsigned int nr_vlan_devs; 24 struct hlist_node hlist; /* linked list */ 25 struct net_device **vlan_devices_arrays[VLAN_PROTO_NUM] 26 [VLAN_GROUP_ARRAY_SPLIT_PARTS]; 27 }; 28 29 struct vlan_info { 30 struct net_device *real_dev; /* The ethernet(like) device 31 * the vlan is attached to. 32 */ 33 struct vlan_group grp; 34 struct list_head vid_list; 35 unsigned int nr_vids; 36 bool auto_vid0; 37 struct rcu_head rcu; 38 }; 39 40 static inline int vlan_proto_idx(__be16 proto) 41 { 42 switch (proto) { 43 case htons(ETH_P_8021Q): 44 return VLAN_PROTO_8021Q; 45 case htons(ETH_P_8021AD): 46 return VLAN_PROTO_8021AD; 47 default: 48 WARN(1, "invalid VLAN protocol: 0x%04x\n", ntohs(proto)); 49 return -EINVAL; 50 } 51 } 52 53 static inline struct net_device *__vlan_group_get_device(struct vlan_group *vg, 54 unsigned int pidx, 55 u16 vlan_id) 56 { 57 struct net_device **array; 58 59 array = vg->vlan_devices_arrays[pidx] 60 [vlan_id / VLAN_GROUP_ARRAY_PART_LEN]; 61 62 /* paired with smp_wmb() in vlan_group_prealloc_vid() */ 63 smp_rmb(); 64 65 return array ? array[vlan_id % VLAN_GROUP_ARRAY_PART_LEN] : NULL; 66 } 67 68 static inline struct net_device *vlan_group_get_device(struct vlan_group *vg, 69 __be16 vlan_proto, 70 u16 vlan_id) 71 { 72 int pidx = vlan_proto_idx(vlan_proto); 73 74 if (pidx < 0) 75 return NULL; 76 77 return __vlan_group_get_device(vg, pidx, vlan_id); 78 } 79 80 static inline void vlan_group_set_device(struct vlan_group *vg, 81 __be16 vlan_proto, u16 vlan_id, 82 struct net_device *dev) 83 { 84 int pidx = vlan_proto_idx(vlan_proto); 85 struct net_device **array; 86 87 if (!vg || pidx < 0) 88 return; 89 array = vg->vlan_devices_arrays[pidx] 90 [vlan_id / VLAN_GROUP_ARRAY_PART_LEN]; 91 array[vlan_id % VLAN_GROUP_ARRAY_PART_LEN] = dev; 92 } 93 94 /* Must be invoked with rcu_read_lock or with RTNL. */ 95 static inline struct net_device *vlan_find_dev(struct net_device *real_dev, 96 __be16 vlan_proto, u16 vlan_id) 97 { 98 struct vlan_info *vlan_info = rcu_dereference_rtnl(real_dev->vlan_info); 99 100 if (vlan_info) 101 return vlan_group_get_device(&vlan_info->grp, 102 vlan_proto, vlan_id); 103 104 return NULL; 105 } 106 107 static inline netdev_features_t vlan_tnl_features(struct net_device *real_dev) 108 { 109 netdev_features_t ret; 110 111 ret = real_dev->hw_enc_features & 112 (NETIF_F_CSUM_MASK | NETIF_F_GSO_SOFTWARE | 113 NETIF_F_GSO_ENCAP_ALL); 114 115 if ((ret & NETIF_F_GSO_ENCAP_ALL) && (ret & NETIF_F_CSUM_MASK)) 116 return (ret & ~NETIF_F_CSUM_MASK) | NETIF_F_HW_CSUM; 117 return 0; 118 } 119 120 #define vlan_group_for_each_dev(grp, i, dev) \ 121 for ((i) = 0; i < VLAN_PROTO_NUM * VLAN_N_VID; i++) \ 122 if (((dev) = __vlan_group_get_device((grp), (i) / VLAN_N_VID, \ 123 (i) % VLAN_N_VID))) 124 125 int vlan_filter_push_vids(struct vlan_info *vlan_info, __be16 proto); 126 void vlan_filter_drop_vids(struct vlan_info *vlan_info, __be16 proto); 127 128 /* netdev_work events propagated from the real device, see vlan_dev_work(). */ 129 enum { 130 VLAN_WORK_LINK_STATE = BIT(0), /* sync up/down with real_dev */ 131 VLAN_WORK_MTU = BIT(1), /* clamp mtu to real_dev's */ 132 VLAN_WORK_FEATURES = BIT(2), /* re-inherit real_dev features */ 133 }; 134 135 void vlan_stacked_transfer_operstate(const struct net_device *rootdev, 136 struct net_device *dev, 137 struct vlan_dev_priv *vlan); 138 139 /* found in vlan_dev.c */ 140 void vlan_dev_set_ingress_priority(const struct net_device *dev, 141 u32 skb_prio, u16 vlan_prio); 142 int vlan_dev_set_egress_priority(const struct net_device *dev, 143 u32 skb_prio, u16 vlan_prio); 144 void vlan_dev_free_egress_priority(const struct net_device *dev); 145 int vlan_dev_change_flags(const struct net_device *dev, u32 flag, u32 mask); 146 void vlan_dev_get_realdev_name(const struct net_device *dev, char *result, 147 size_t size); 148 149 int vlan_check_real_dev(struct net_device *real_dev, 150 __be16 protocol, u16 vlan_id, 151 struct netlink_ext_ack *extack); 152 void vlan_setup(struct net_device *dev); 153 int register_vlan_dev(struct net_device *dev, struct netlink_ext_ack *extack); 154 void unregister_vlan_dev(struct net_device *dev, struct list_head *head); 155 bool vlan_dev_inherit_address(struct net_device *dev, 156 struct net_device *real_dev); 157 158 static inline u32 vlan_get_ingress_priority(struct net_device *dev, 159 u16 vlan_tci) 160 { 161 struct vlan_dev_priv *vip = vlan_dev_priv(dev); 162 163 return vip->ingress_priority_map[(vlan_tci >> VLAN_PRIO_SHIFT) & 0x7]; 164 } 165 166 #ifdef CONFIG_VLAN_8021Q_GVRP 167 int vlan_gvrp_request_join(const struct net_device *dev); 168 void vlan_gvrp_request_leave(const struct net_device *dev); 169 int vlan_gvrp_init_applicant(struct net_device *dev); 170 void vlan_gvrp_uninit_applicant(struct net_device *dev); 171 int vlan_gvrp_init(void); 172 void vlan_gvrp_uninit(void); 173 #else 174 static inline int vlan_gvrp_request_join(const struct net_device *dev) { return 0; } 175 static inline void vlan_gvrp_request_leave(const struct net_device *dev) {} 176 static inline int vlan_gvrp_init_applicant(struct net_device *dev) { return 0; } 177 static inline void vlan_gvrp_uninit_applicant(struct net_device *dev) {} 178 static inline int vlan_gvrp_init(void) { return 0; } 179 static inline void vlan_gvrp_uninit(void) {} 180 #endif 181 182 #ifdef CONFIG_VLAN_8021Q_MVRP 183 int vlan_mvrp_request_join(const struct net_device *dev); 184 void vlan_mvrp_request_leave(const struct net_device *dev); 185 int vlan_mvrp_init_applicant(struct net_device *dev); 186 void vlan_mvrp_uninit_applicant(struct net_device *dev); 187 int vlan_mvrp_init(void); 188 void vlan_mvrp_uninit(void); 189 #else 190 static inline int vlan_mvrp_request_join(const struct net_device *dev) { return 0; } 191 static inline void vlan_mvrp_request_leave(const struct net_device *dev) {} 192 static inline int vlan_mvrp_init_applicant(struct net_device *dev) { return 0; } 193 static inline void vlan_mvrp_uninit_applicant(struct net_device *dev) {} 194 static inline int vlan_mvrp_init(void) { return 0; } 195 static inline void vlan_mvrp_uninit(void) {} 196 #endif 197 198 extern const char vlan_fullname[]; 199 extern const char vlan_version[]; 200 int vlan_netlink_init(void); 201 void vlan_netlink_fini(void); 202 203 extern struct rtnl_link_ops vlan_link_ops; 204 205 extern unsigned int vlan_net_id; 206 207 struct proc_dir_entry; 208 209 struct vlan_net { 210 /* /proc/net/vlan */ 211 struct proc_dir_entry *proc_vlan_dir; 212 /* /proc/net/vlan/config */ 213 struct proc_dir_entry *proc_vlan_conf; 214 /* Determines interface naming scheme. */ 215 unsigned short name_type; 216 }; 217 218 #endif /* !(__BEN_VLAN_802_1Q_INC__) */ 219