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 */ 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 */ 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. */ 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 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 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 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 } 106 107 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 } 115 116 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 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 } 131 132 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 } 145 146 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 } 151 152 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 158 159 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 * 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