1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * Vxlan private header file
4 *
5 */
6
7 #ifndef _VXLAN_PRIVATE_H
8 #define _VXLAN_PRIVATE_H
9
10 #include <linux/rhashtable.h>
11
12 extern unsigned int vxlan_net_id;
13 extern const u8 all_zeros_mac[ETH_ALEN + 2];
14 extern const struct rhashtable_params vxlan_vni_rht_params;
15
16 #define PORT_HASH_BITS 8
17 #define PORT_HASH_SIZE (1 << PORT_HASH_BITS)
18
19 /* per-network namespace private data for this module */
20 struct vxlan_net {
21 struct list_head vxlan_list;
22 /* sock_list is protected by rtnl lock */
23 struct hlist_head sock_list[PORT_HASH_SIZE];
24 struct notifier_block nexthop_notifier_block;
25 };
26
27 struct vxlan_fdb_key {
28 u8 eth_addr[ETH_ALEN];
29 __be32 vni;
30 };
31
32 /* Forwarding table entry */
33 struct vxlan_fdb {
34 struct rhash_head rhnode;
35 struct rcu_head rcu;
36 unsigned long updated; /* jiffies */
37 unsigned long used;
38 struct list_head remotes;
39 struct vxlan_fdb_key key;
40 u16 state; /* see ndm_state */
41 u16 flags; /* see ndm_flags and below */
42 struct list_head nh_list;
43 struct hlist_node fdb_node;
44 struct nexthop __rcu *nh;
45 struct vxlan_dev __rcu *vdev;
46 };
47
48 #define NTF_VXLAN_ADDED_BY_USER 0x100
49
50 /* Virtual Network hash table head */
vni_head(struct vxlan_sock * vs,__be32 vni)51 static inline struct hlist_head *vni_head(struct vxlan_sock *vs, __be32 vni)
52 {
53 return &vs->vni_list[hash_32((__force u32)vni, VNI_HASH_BITS)];
54 }
55
56 /* Socket hash table head */
vs_head(struct net * net,__be16 port)57 static inline struct hlist_head *vs_head(struct net *net, __be16 port)
58 {
59 struct vxlan_net *vn = net_generic(net, vxlan_net_id);
60
61 return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
62 }
63
64 /* First remote destination for a forwarding entry. */
first_remote_rcu(struct vxlan_fdb * fdb)65 static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
66 {
67 if (rcu_access_pointer(fdb->nh))
68 return NULL;
69 return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
70 }
71
first_remote_rtnl(struct vxlan_fdb * fdb)72 static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
73 {
74 if (rcu_access_pointer(fdb->nh))
75 return NULL;
76 return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
77 }
78
79 #if IS_ENABLED(CONFIG_IPV6)
80 static inline
vxlan_addr_equal(const union vxlan_addr * a,const union vxlan_addr * b)81 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
82 {
83 if (a->sa.sa_family != b->sa.sa_family)
84 return false;
85 if (a->sa.sa_family == AF_INET6)
86 return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
87 else
88 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
89 }
90
vxlan_nla_get_addr(union vxlan_addr * ip,const struct nlattr * nla)91 static inline int vxlan_nla_get_addr(union vxlan_addr *ip,
92 const struct nlattr *nla)
93 {
94 if (nla_len(nla) >= sizeof(struct in6_addr)) {
95 ip->sin6.sin6_addr = nla_get_in6_addr(nla);
96 ip->sa.sa_family = AF_INET6;
97 return 0;
98 } else if (nla_len(nla) >= sizeof(__be32)) {
99 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
100 ip->sa.sa_family = AF_INET;
101 return 0;
102 } else {
103 return -EAFNOSUPPORT;
104 }
105 }
106
vxlan_nla_put_addr(struct sk_buff * skb,int attr,const union vxlan_addr * ip)107 static inline int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
108 const union vxlan_addr *ip)
109 {
110 if (ip->sa.sa_family == AF_INET6)
111 return nla_put_in6_addr(skb, attr, &ip->sin6.sin6_addr);
112 else
113 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
114 }
115
vxlan_addr_is_multicast(const union vxlan_addr * ip)116 static inline bool vxlan_addr_is_multicast(const union vxlan_addr *ip)
117 {
118 if (ip->sa.sa_family == AF_INET6)
119 return ipv6_addr_is_multicast(&ip->sin6.sin6_addr);
120 else
121 return ipv4_is_multicast(ip->sin.sin_addr.s_addr);
122 }
123
124 #else /* !CONFIG_IPV6 */
125
126 static inline
vxlan_addr_equal(const union vxlan_addr * a,const union vxlan_addr * b)127 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
128 {
129 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
130 }
131
vxlan_nla_get_addr(union vxlan_addr * ip,const struct nlattr * nla)132 static inline int vxlan_nla_get_addr(union vxlan_addr *ip,
133 const struct nlattr *nla)
134 {
135 if (nla_len(nla) >= sizeof(struct in6_addr)) {
136 return -EAFNOSUPPORT;
137 } else if (nla_len(nla) >= sizeof(__be32)) {
138 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla);
139 ip->sa.sa_family = AF_INET;
140 return 0;
141 } else {
142 return -EAFNOSUPPORT;
143 }
144 }
145
vxlan_nla_put_addr(struct sk_buff * skb,int attr,const union vxlan_addr * ip)146 static inline int vxlan_nla_put_addr(struct sk_buff *skb, int attr,
147 const union vxlan_addr *ip)
148 {
149 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr);
150 }
151
vxlan_addr_is_multicast(const union vxlan_addr * ip)152 static inline bool vxlan_addr_is_multicast(const union vxlan_addr *ip)
153 {
154 return ipv4_is_multicast(ip->sin.sin_addr.s_addr);
155 }
156
157 #endif
158
vxlan_addr_size(const union vxlan_addr * ip)159 static inline size_t vxlan_addr_size(const union vxlan_addr *ip)
160 {
161 if (ip->sa.sa_family == AF_INET6)
162 return sizeof(struct in6_addr);
163 else
164 return sizeof(__be32);
165 }
166
167 static inline struct vxlan_vni_node *
vxlan_vnifilter_lookup(struct vxlan_dev * vxlan,__be32 vni)168 vxlan_vnifilter_lookup(struct vxlan_dev *vxlan, __be32 vni)
169 {
170 struct vxlan_vni_group *vg;
171
172 vg = rcu_dereference_rtnl(vxlan->vnigrp);
173 if (!vg)
174 return NULL;
175
176 return rhashtable_lookup_fast(&vg->vni_hash, &vni,
177 vxlan_vni_rht_params);
178 }
179
180 /* vxlan_core.c */
181 int vxlan_fdb_create(struct vxlan_dev *vxlan,
182 const u8 *mac, union vxlan_addr *ip,
183 __u16 state, __be16 port, __be32 src_vni,
184 __be32 vni, __u32 ifindex, __u16 ndm_flags,
185 u32 nhid, struct vxlan_fdb **fdb,
186 struct netlink_ext_ack *extack);
187 int __vxlan_fdb_delete(struct vxlan_dev *vxlan,
188 const unsigned char *addr, union vxlan_addr ip,
189 __be16 port, __be32 src_vni, __be32 vni,
190 u32 ifindex, bool swdev_notify);
191 u32 eth_vni_hash(const unsigned char *addr, __be32 vni);
192 u32 fdb_head_index(struct vxlan_dev *vxlan, const u8 *mac, __be32 vni);
193 int vxlan_fdb_update(struct vxlan_dev *vxlan,
194 const u8 *mac, union vxlan_addr *ip,
195 __u16 state, __u16 flags,
196 __be16 port, __be32 src_vni, __be32 vni,
197 __u32 ifindex, __u16 ndm_flags, u32 nhid,
198 bool swdev_notify, struct netlink_ext_ack *extack);
199 void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
200 __be32 default_vni, struct vxlan_rdst *rdst, bool did_rsc);
201 int vxlan_vni_in_use(struct net *src_net, struct vxlan_dev *vxlan,
202 struct vxlan_config *conf, __be32 vni);
203
204 /* vxlan_vnifilter.c */
205 int vxlan_vnigroup_init(struct vxlan_dev *vxlan);
206 void vxlan_vnigroup_uninit(struct vxlan_dev *vxlan);
207
208 int vxlan_vnifilter_init(void);
209 void vxlan_vnifilter_uninit(void);
210 void vxlan_vnifilter_count(struct vxlan_dev *vxlan, __be32 vni,
211 struct vxlan_vni_node *vninode,
212 int type, unsigned int len);
213
214 void vxlan_vs_add_vnigrp(struct vxlan_dev *vxlan,
215 struct vxlan_sock *vs,
216 bool ipv6);
217 void vxlan_vs_del_vnigrp(struct vxlan_dev *vxlan);
218 int vxlan_vnilist_update_group(struct vxlan_dev *vxlan,
219 union vxlan_addr *old_remote_ip,
220 union vxlan_addr *new_remote_ip,
221 struct netlink_ext_ack *extack);
222
223
224 /* vxlan_multicast.c */
225 int vxlan_multicast_join(struct vxlan_dev *vxlan);
226 int vxlan_multicast_leave(struct vxlan_dev *vxlan);
227 bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev,
228 __be32 vni, union vxlan_addr *rip, int rifindex);
229 int vxlan_igmp_join(struct vxlan_dev *vxlan, union vxlan_addr *rip,
230 int rifindex);
231 int vxlan_igmp_leave(struct vxlan_dev *vxlan, union vxlan_addr *rip,
232 int rifindex);
233
234 /* vxlan_mdb.c */
235 int vxlan_mdb_dump(struct net_device *dev, struct sk_buff *skb,
236 struct netlink_callback *cb);
237 int vxlan_mdb_add(struct net_device *dev, struct nlattr *tb[], u16 nlmsg_flags,
238 struct netlink_ext_ack *extack);
239 int vxlan_mdb_del(struct net_device *dev, struct nlattr *tb[],
240 struct netlink_ext_ack *extack);
241 int vxlan_mdb_del_bulk(struct net_device *dev, struct nlattr *tb[],
242 struct netlink_ext_ack *extack);
243 int vxlan_mdb_get(struct net_device *dev, struct nlattr *tb[], u32 portid,
244 u32 seq, struct netlink_ext_ack *extack);
245 struct vxlan_mdb_entry *vxlan_mdb_entry_skb_get(struct vxlan_dev *vxlan,
246 struct sk_buff *skb,
247 __be32 src_vni);
248 netdev_tx_t vxlan_mdb_xmit(struct vxlan_dev *vxlan,
249 const struct vxlan_mdb_entry *mdb_entry,
250 struct sk_buff *skb);
251 int vxlan_mdb_init(struct vxlan_dev *vxlan);
252 void vxlan_mdb_fini(struct vxlan_dev *vxlan);
253 #endif
254