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 struct rcu_head rcu;
37 };
38
39 static inline int vlan_proto_idx(__be16 proto)
40 {
41 switch (proto) {
42 case htons(ETH_P_8021Q):
43 return VLAN_PROTO_8021Q;
44 case htons(ETH_P_8021AD):
45 return VLAN_PROTO_8021AD;
46 default:
47 WARN(1, "invalid VLAN protocol: 0x%04x\n", ntohs(proto));
48 return -EINVAL;
49 }
50 }
51
52 static inline struct net_device *__vlan_group_get_device(struct vlan_group *vg,
53 unsigned int pidx,
54 u16 vlan_id)
55 {
56 struct net_device **array;
57
58 array = vg->vlan_devices_arrays[pidx]
59 [vlan_id / VLAN_GROUP_ARRAY_PART_LEN];
60
61 /* paired with smp_wmb() in vlan_group_prealloc_vid() */
62 smp_rmb();
63
64 return array ? array[vlan_id % VLAN_GROUP_ARRAY_PART_LEN] : NULL;
65 }
66
67 static inline struct net_device *vlan_group_get_device(struct vlan_group *vg,
68 __be16 vlan_proto,
69 u16 vlan_id)
70 {
71 int pidx = vlan_proto_idx(vlan_proto);
72
73 if (pidx < 0)
74 return NULL;
75
76 return __vlan_group_get_device(vg, pidx, vlan_id);
77 }
78
79 static inline void vlan_group_set_device(struct vlan_group *vg,
80 __be16 vlan_proto, u16 vlan_id,
81 struct net_device *dev)
82 {
83 int pidx = vlan_proto_idx(vlan_proto);
84 struct net_device **array;
85
86 if (!vg || pidx < 0)
87 return;
88 array = vg->vlan_devices_arrays[pidx]
89 [vlan_id / VLAN_GROUP_ARRAY_PART_LEN];
90 array[vlan_id % VLAN_GROUP_ARRAY_PART_LEN] = dev;
91 }
92
93 /* Must be invoked with rcu_read_lock or with RTNL. */
94 static inline struct net_device *vlan_find_dev(struct net_device *real_dev,
95 __be16 vlan_proto, u16 vlan_id)
96 {
97 struct vlan_info *vlan_info = rcu_dereference_rtnl(real_dev->vlan_info);
98
99 if (vlan_info)
100 return vlan_group_get_device(&vlan_info->grp,
101 vlan_proto, vlan_id);
102
103 return NULL;
104 }
105
106 static inline netdev_features_t vlan_tnl_features(struct net_device *real_dev)
107 {
108 netdev_features_t ret;
109
110 ret = real_dev->hw_enc_features &
111 (NETIF_F_CSUM_MASK | NETIF_F_GSO_SOFTWARE |
112 NETIF_F_GSO_ENCAP_ALL);
113
114 if ((ret & NETIF_F_GSO_ENCAP_ALL) && (ret & NETIF_F_CSUM_MASK))
115 return (ret & ~NETIF_F_CSUM_MASK) | NETIF_F_HW_CSUM;
116 return 0;
117 }
118
119 #define vlan_group_for_each_dev(grp, i, dev) \
120 for ((i) = 0; i < VLAN_PROTO_NUM * VLAN_N_VID; i++) \
121 if (((dev) = __vlan_group_get_device((grp), (i) / VLAN_N_VID, \
122 (i) % VLAN_N_VID)))
123
124 int vlan_filter_push_vids(struct vlan_info *vlan_info, __be16 proto);
125 void vlan_filter_drop_vids(struct vlan_info *vlan_info, __be16 proto);
126
127 /* found in vlan_dev.c */
128 void vlan_dev_set_ingress_priority(const struct net_device *dev,
129 u32 skb_prio, u16 vlan_prio);
130 int vlan_dev_set_egress_priority(const struct net_device *dev,
131 u32 skb_prio, u16 vlan_prio);
132 void vlan_dev_free_egress_priority(const struct net_device *dev);
133 int vlan_dev_change_flags(const struct net_device *dev, u32 flag, u32 mask);
134 void vlan_dev_get_realdev_name(const struct net_device *dev, char *result,
135 size_t size);
136
137 int vlan_check_real_dev(struct net_device *real_dev,
138 __be16 protocol, u16 vlan_id,
139 struct netlink_ext_ack *extack);
140 void vlan_setup(struct net_device *dev);
141 int register_vlan_dev(struct net_device *dev, struct netlink_ext_ack *extack);
142 void unregister_vlan_dev(struct net_device *dev, struct list_head *head);
143 bool vlan_dev_inherit_address(struct net_device *dev,
144 struct net_device *real_dev);
145
146 static inline u32 vlan_get_ingress_priority(struct net_device *dev,
147 u16 vlan_tci)
148 {
149 struct vlan_dev_priv *vip = vlan_dev_priv(dev);
150
151 return vip->ingress_priority_map[(vlan_tci >> VLAN_PRIO_SHIFT) & 0x7];
152 }
153
154 #ifdef CONFIG_VLAN_8021Q_GVRP
155 int vlan_gvrp_request_join(const struct net_device *dev);
156 void vlan_gvrp_request_leave(const struct net_device *dev);
157 int vlan_gvrp_init_applicant(struct net_device *dev);
158 void vlan_gvrp_uninit_applicant(struct net_device *dev);
159 int vlan_gvrp_init(void);
160 void vlan_gvrp_uninit(void);
161 #else
162 static inline int vlan_gvrp_request_join(const struct net_device *dev) { return 0; }
163 static inline void vlan_gvrp_request_leave(const struct net_device *dev) {}
164 static inline int vlan_gvrp_init_applicant(struct net_device *dev) { return 0; }
165 static inline void vlan_gvrp_uninit_applicant(struct net_device *dev) {}
166 static inline int vlan_gvrp_init(void) { return 0; }
167 static inline void vlan_gvrp_uninit(void) {}
168 #endif
169
170 #ifdef CONFIG_VLAN_8021Q_MVRP
171 int vlan_mvrp_request_join(const struct net_device *dev);
172 void vlan_mvrp_request_leave(const struct net_device *dev);
173 int vlan_mvrp_init_applicant(struct net_device *dev);
174 void vlan_mvrp_uninit_applicant(struct net_device *dev);
175 int vlan_mvrp_init(void);
176 void vlan_mvrp_uninit(void);
177 #else
178 static inline int vlan_mvrp_request_join(const struct net_device *dev) { return 0; }
179 static inline void vlan_mvrp_request_leave(const struct net_device *dev) {}
180 static inline int vlan_mvrp_init_applicant(struct net_device *dev) { return 0; }
181 static inline void vlan_mvrp_uninit_applicant(struct net_device *dev) {}
182 static inline int vlan_mvrp_init(void) { return 0; }
183 static inline void vlan_mvrp_uninit(void) {}
184 #endif
185
186 extern const char vlan_fullname[];
187 extern const char vlan_version[];
188 int vlan_netlink_init(void);
189 void vlan_netlink_fini(void);
190
191 extern struct rtnl_link_ops vlan_link_ops;
192
193 extern unsigned int vlan_net_id;
194
195 struct proc_dir_entry;
196
197 struct vlan_net {
198 /* /proc/net/vlan */
199 struct proc_dir_entry *proc_vlan_dir;
200 /* /proc/net/vlan/config */
201 struct proc_dir_entry *proc_vlan_conf;
202 /* Determines interface naming scheme. */
203 unsigned short name_type;
204 };
205
206 #endif /* !(__BEN_VLAN_802_1Q_INC__) */
207
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.