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 struct hlist_head sock_list[PORT_HASH_SIZE]; 23 spinlock_t sock_lock; 24 struct notifier_block nexthop_notifier_block; 25 }; 26 27 /* Forwarding table entry */ 28 struct vxlan_fdb { 29 struct hlist_node hlist; /* linked list of entries */ 30 struct rcu_head rcu; 31 unsigned long updated; /* jiffies */ 32 unsigned long used; 33 struct list_head remotes; 34 u8 eth_addr[ETH_ALEN]; 35 u16 state; /* see ndm_state */ 36 __be32 vni; 37 u16 flags; /* see ndm_flags and below */ 38 struct list_head nh_list; 39 struct nexthop __rcu *nh; 40 struct vxlan_dev __rcu *vdev; 41 }; 42 43 #define NTF_VXLAN_ADDED_BY_USER 0x100 44 45 /* Virtual Network hash table head */ 46 static inline struct hlist_head *vni_head(struct vxlan_sock *vs, __be32 vni) 47 { 48 return &vs->vni_list[hash_32((__force u32)vni, VNI_HASH_BITS)]; 49 } 50 51 /* Socket hash table head */ 52 static inline struct hlist_head *vs_head(struct net *net, __be16 port) 53 { 54 struct vxlan_net *vn = net_generic(net, vxlan_net_id); 55 56 return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)]; 57 } 58 59 /* First remote destination for a forwarding entry. 60 * Guaranteed to be non-NULL because remotes are never deleted. 61 */ 62 static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb) 63 { 64 if (rcu_access_pointer(fdb->nh)) 65 return NULL; 66 return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list); 67 } 68 69 static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb) 70 { 71 if (rcu_access_pointer(fdb->nh)) 72 return NULL; 73 return list_first_entry(&fdb->remotes, struct vxlan_rdst, list); 74 } 75 76 #if IS_ENABLED(CONFIG_IPV6) 77 static inline 78 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b) 79 { 80 if (a->sa.sa_family != b->sa.sa_family) 81 return false; 82 if (a->sa.sa_family == AF_INET6) 83 return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr); 84 else 85 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr; 86 } 87 88 static inline int vxlan_nla_get_addr(union vxlan_addr *ip, 89 const struct nlattr *nla) 90 { 91 if (nla_len(nla) >= sizeof(struct in6_addr)) { 92 ip->sin6.sin6_addr = nla_get_in6_addr(nla); 93 ip->sa.sa_family = AF_INET6; 94 return 0; 95 } else if (nla_len(nla) >= sizeof(__be32)) { 96 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla); 97 ip->sa.sa_family = AF_INET; 98 return 0; 99 } else { 100 return -EAFNOSUPPORT; 101 } 102 } 103 104 static inline int vxlan_nla_put_addr(struct sk_buff *skb, int attr, 105 const union vxlan_addr *ip) 106 { 107 if (ip->sa.sa_family == AF_INET6) 108 return nla_put_in6_addr(skb, attr, &ip->sin6.sin6_addr); 109 else 110 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr); 111 } 112 113 static inline bool vxlan_addr_is_multicast(const union vxlan_addr *ip) 114 { 115 if (ip->sa.sa_family == AF_INET6) 116 return ipv6_addr_is_multicast(&ip->sin6.sin6_addr); 117 else 118 return ipv4_is_multicast(ip->sin.sin_addr.s_addr); 119 } 120 121 #else /* !CONFIG_IPV6 */ 122 123 static inline 124 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b) 125 { 126 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr; 127 } 128 129 static inline int vxlan_nla_get_addr(union vxlan_addr *ip, 130 const struct nlattr *nla) 131 { 132 if (nla_len(nla) >= sizeof(struct in6_addr)) { 133 return -EAFNOSUPPORT; 134 } else if (nla_len(nla) >= sizeof(__be32)) { 135 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla); 136 ip->sa.sa_family = AF_INET; 137 return 0; 138 } else { 139 return -EAFNOSUPPORT; 140 } 141 } 142 143 static inline int vxlan_nla_put_addr(struct sk_buff *skb, int attr, 144 const union vxlan_addr *ip) 145 { 146 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr); 147 } 148 149 static inline bool vxlan_addr_is_multicast(const union vxlan_addr *ip) 150 { 151 return ipv4_is_multicast(ip->sin.sin_addr.s_addr); 152 } 153 154 #endif 155 156 static inline size_t vxlan_addr_size(const union vxlan_addr *ip) 157 { 158 if (ip->sa.sa_family == AF_INET6) 159 return sizeof(struct in6_addr); 160 else 161 return sizeof(__be32); 162 } 163 164 static inline struct vxlan_vni_node * 165 vxlan_vnifilter_lookup(struct vxlan_dev *vxlan, __be32 vni) 166 { 167 struct vxlan_vni_group *vg; 168 169 vg = rcu_dereference_rtnl(vxlan->vnigrp); 170 if (!vg) 171 return NULL; 172 173 return rhashtable_lookup_fast(&vg->vni_hash, &vni, 174 vxlan_vni_rht_params); 175 } 176 177 /* vxlan_core.c */ 178 int vxlan_fdb_create(struct vxlan_dev *vxlan, 179 const u8 *mac, union vxlan_addr *ip, 180 __u16 state, __be16 port, __be32 src_vni, 181 __be32 vni, __u32 ifindex, __u16 ndm_flags, 182 u32 nhid, struct vxlan_fdb **fdb, 183 struct netlink_ext_ack *extack); 184 int __vxlan_fdb_delete(struct vxlan_dev *vxlan, 185 const unsigned char *addr, union vxlan_addr ip, 186 __be16 port, __be32 src_vni, __be32 vni, 187 u32 ifindex, bool swdev_notify); 188 u32 eth_vni_hash(const unsigned char *addr, __be32 vni); 189 u32 fdb_head_index(struct vxlan_dev *vxlan, const u8 *mac, __be32 vni); 190 int vxlan_fdb_update(struct vxlan_dev *vxlan, 191 const u8 *mac, union vxlan_addr *ip, 192 __u16 state, __u16 flags, 193 __be16 port, __be32 src_vni, __be32 vni, 194 __u32 ifindex, __u16 ndm_flags, u32 nhid, 195 bool swdev_notify, struct netlink_ext_ack *extack); 196 void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev, 197 __be32 default_vni, struct vxlan_rdst *rdst, bool did_rsc); 198 int vxlan_vni_in_use(struct net *src_net, struct vxlan_dev *vxlan, 199 struct vxlan_config *conf, __be32 vni); 200 201 /* vxlan_vnifilter.c */ 202 int vxlan_vnigroup_init(struct vxlan_dev *vxlan); 203 void vxlan_vnigroup_uninit(struct vxlan_dev *vxlan); 204 205 void vxlan_vnifilter_init(void); 206 void vxlan_vnifilter_uninit(void); 207 void vxlan_vnifilter_count(struct vxlan_dev *vxlan, __be32 vni, 208 struct vxlan_vni_node *vninode, 209 int type, unsigned int len); 210 211 void vxlan_vs_add_vnigrp(struct vxlan_dev *vxlan, 212 struct vxlan_sock *vs, 213 bool ipv6); 214 void vxlan_vs_del_vnigrp(struct vxlan_dev *vxlan); 215 int vxlan_vnilist_update_group(struct vxlan_dev *vxlan, 216 union vxlan_addr *old_remote_ip, 217 union vxlan_addr *new_remote_ip, 218 struct netlink_ext_ack *extack); 219 220 221 /* vxlan_multicast.c */ 222 int vxlan_multicast_join(struct vxlan_dev *vxlan); 223 int vxlan_multicast_leave(struct vxlan_dev *vxlan); 224 bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev, 225 __be32 vni, union vxlan_addr *rip, int rifindex); 226 int vxlan_igmp_join(struct vxlan_dev *vxlan, union vxlan_addr *rip, 227 int rifindex); 228 int vxlan_igmp_leave(struct vxlan_dev *vxlan, union vxlan_addr *rip, 229 int rifindex); 230 231 /* vxlan_mdb.c */ 232 int vxlan_mdb_dump(struct net_device *dev, struct sk_buff *skb, 233 struct netlink_callback *cb); 234 int vxlan_mdb_add(struct net_device *dev, struct nlattr *tb[], u16 nlmsg_flags, 235 struct netlink_ext_ack *extack); 236 int vxlan_mdb_del(struct net_device *dev, struct nlattr *tb[], 237 struct netlink_ext_ack *extack); 238 int vxlan_mdb_get(struct net_device *dev, struct nlattr *tb[], u32 portid, 239 u32 seq, struct netlink_ext_ack *extack); 240 struct vxlan_mdb_entry *vxlan_mdb_entry_skb_get(struct vxlan_dev *vxlan, 241 struct sk_buff *skb, 242 __be32 src_vni); 243 netdev_tx_t vxlan_mdb_xmit(struct vxlan_dev *vxlan, 244 const struct vxlan_mdb_entry *mdb_entry, 245 struct sk_buff *skb); 246 int vxlan_mdb_init(struct vxlan_dev *vxlan); 247 void vxlan_mdb_fini(struct vxlan_dev *vxlan); 248 #endif 249