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 /* Generation counter for RTM_GETTUNNEL dumps */ 26 atomic_t vnifilter_seq; 27 }; 28 29 struct vxlan_fdb_key { 30 u8 eth_addr[ETH_ALEN]; 31 __be32 vni; 32 }; 33 34 /* Forwarding table entry */ 35 struct vxlan_fdb { 36 struct rhash_head rhnode; 37 struct rcu_head rcu; 38 unsigned long updated; /* jiffies */ 39 unsigned long used; 40 struct list_head remotes; 41 struct vxlan_fdb_key key; 42 u16 state; /* see ndm_state */ 43 u16 flags; /* see ndm_flags and below */ 44 struct list_head nh_list; 45 struct hlist_node fdb_node; 46 struct nexthop __rcu *nh; 47 struct vxlan_dev __rcu *vdev; 48 }; 49 50 #define NTF_VXLAN_ADDED_BY_USER 0x100 51 52 /* Virtual Network hash table head */ 53 static inline struct hlist_head *vni_head(struct vxlan_sock *vs, __be32 vni) 54 { 55 return &vs->vni_list[hash_32((__force u32)vni, VNI_HASH_BITS)]; 56 } 57 58 /* Socket hash table head */ 59 static inline struct hlist_head *vs_head(struct net *net, __be16 port) 60 { 61 struct vxlan_net *vn = net_generic(net, vxlan_net_id); 62 63 return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)]; 64 } 65 66 /* First remote destination for a forwarding entry. */ 67 static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb) 68 { 69 if (rcu_access_pointer(fdb->nh)) 70 return NULL; 71 return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list); 72 } 73 74 static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb) 75 { 76 if (rcu_access_pointer(fdb->nh)) 77 return NULL; 78 return list_first_entry(&fdb->remotes, struct vxlan_rdst, list); 79 } 80 81 #if IS_ENABLED(CONFIG_IPV6) 82 static inline 83 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b) 84 { 85 if (a->sa.sa_family != b->sa.sa_family) 86 return false; 87 if (a->sa.sa_family == AF_INET6) 88 return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr); 89 else 90 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr; 91 } 92 93 static inline int vxlan_nla_get_addr(union vxlan_addr *ip, 94 const struct nlattr *nla) 95 { 96 if (nla_len(nla) >= sizeof(struct in6_addr)) { 97 ip->sin6.sin6_addr = nla_get_in6_addr(nla); 98 ip->sa.sa_family = AF_INET6; 99 return 0; 100 } else if (nla_len(nla) >= sizeof(__be32)) { 101 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla); 102 ip->sa.sa_family = AF_INET; 103 return 0; 104 } else { 105 return -EAFNOSUPPORT; 106 } 107 } 108 109 static inline int vxlan_nla_put_addr(struct sk_buff *skb, int attr, 110 const union vxlan_addr *ip) 111 { 112 if (ip->sa.sa_family == AF_INET6) 113 return nla_put_in6_addr(skb, attr, &ip->sin6.sin6_addr); 114 else 115 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr); 116 } 117 118 static inline bool vxlan_addr_is_multicast(const union vxlan_addr *ip) 119 { 120 if (ip->sa.sa_family == AF_INET6) 121 return ipv6_addr_is_multicast(&ip->sin6.sin6_addr); 122 else 123 return ipv4_is_multicast(ip->sin.sin_addr.s_addr); 124 } 125 126 #else /* !CONFIG_IPV6 */ 127 128 static inline 129 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b) 130 { 131 return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr; 132 } 133 134 static inline int vxlan_nla_get_addr(union vxlan_addr *ip, 135 const struct nlattr *nla) 136 { 137 if (nla_len(nla) >= sizeof(struct in6_addr)) { 138 return -EAFNOSUPPORT; 139 } else if (nla_len(nla) >= sizeof(__be32)) { 140 ip->sin.sin_addr.s_addr = nla_get_in_addr(nla); 141 ip->sa.sa_family = AF_INET; 142 return 0; 143 } else { 144 return -EAFNOSUPPORT; 145 } 146 } 147 148 static inline int vxlan_nla_put_addr(struct sk_buff *skb, int attr, 149 const union vxlan_addr *ip) 150 { 151 return nla_put_in_addr(skb, attr, ip->sin.sin_addr.s_addr); 152 } 153 154 static inline bool vxlan_addr_is_multicast(const union vxlan_addr *ip) 155 { 156 return ipv4_is_multicast(ip->sin.sin_addr.s_addr); 157 } 158 159 #endif 160 161 static inline size_t vxlan_addr_size(const union vxlan_addr *ip) 162 { 163 if (ip->sa.sa_family == AF_INET6) 164 return sizeof(struct in6_addr); 165 else 166 return sizeof(__be32); 167 } 168 169 static inline struct vxlan_vni_node * 170 vxlan_vnifilter_lookup(struct vxlan_dev *vxlan, __be32 vni) 171 { 172 struct vxlan_vni_group *vg; 173 174 vg = rcu_dereference_rtnl(vxlan->vnigrp); 175 if (!vg) 176 return NULL; 177 178 return rhashtable_lookup_fast(&vg->vni_hash, &vni, 179 vxlan_vni_rht_params); 180 } 181 182 static inline void vxlan_vnifilter_seq_inc(const struct net *net) 183 { 184 struct vxlan_net *vn = net_generic(net, vxlan_net_id); 185 186 atomic_inc(&vn->vnifilter_seq); 187 } 188 189 /* vxlan_core.c */ 190 int vxlan_fdb_create(struct vxlan_dev *vxlan, 191 const u8 *mac, union vxlan_addr *ip, 192 __u16 state, __be16 port, __be32 src_vni, 193 __be32 vni, __u32 ifindex, __u16 ndm_flags, 194 u32 nhid, struct vxlan_fdb **fdb, 195 struct netlink_ext_ack *extack); 196 int __vxlan_fdb_delete(struct vxlan_dev *vxlan, 197 const unsigned char *addr, union vxlan_addr ip, 198 __be16 port, __be32 src_vni, __be32 vni, 199 u32 ifindex, bool swdev_notify); 200 int vxlan_fdb_update(struct vxlan_dev *vxlan, 201 const u8 *mac, union vxlan_addr *ip, 202 __u16 state, __u16 flags, 203 __be16 port, __be32 src_vni, __be32 vni, 204 __u32 ifindex, __u16 ndm_flags, u32 nhid, 205 bool swdev_notify, struct netlink_ext_ack *extack); 206 void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev, 207 const struct vxlan_config *cfg, 208 __be32 default_vni, struct vxlan_rdst *rdst, bool did_rsc); 209 int vxlan_vni_in_use(struct net *src_net, struct vxlan_dev *vxlan, 210 const struct vxlan_config *conf, __be32 vni); 211 212 /* vxlan_vnifilter.c */ 213 int vxlan_vnigroup_init(struct vxlan_dev *vxlan); 214 void vxlan_vnigroup_uninit(struct vxlan_dev *vxlan); 215 216 int vxlan_vnifilter_init(void); 217 void vxlan_vnifilter_uninit(void); 218 void vxlan_vnifilter_count(struct vxlan_dev *vxlan, 219 const struct vxlan_config *cfg, __be32 vni, 220 struct vxlan_vni_node *vninode, 221 int type, unsigned int len); 222 223 void vxlan_vs_add_vnigrp(struct vxlan_dev *vxlan, 224 struct vxlan_sock *vs, 225 bool ipv6); 226 void vxlan_vs_del_vnigrp(struct vxlan_dev *vxlan); 227 bool vxlan_vnifilter_has_multicast(const struct vxlan_dev *vxlan); 228 int vxlan_update_default_fdb_entry(struct vxlan_dev *vxlan, __be32 vni, 229 const union vxlan_addr *old_remote_ip, 230 const union vxlan_addr *remote_ip, 231 u32 old_ifindex, u32 new_ifindex, 232 struct netlink_ext_ack *extack); 233 int vxlan_vnilist_update_group(struct vxlan_dev *vxlan, 234 const union vxlan_addr *old_remote_ip, 235 const union vxlan_addr *new_remote_ip, 236 u32 old_ifindex, u32 new_ifindex, 237 struct netlink_ext_ack *extack); 238 239 240 /* vxlan_multicast.c */ 241 int vxlan_multicast_join(struct vxlan_dev *vxlan); 242 int vxlan_multicast_leave(struct vxlan_dev *vxlan); 243 bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev, 244 __be32 vni, const union vxlan_addr *rip, int rifindex); 245 int vxlan_igmp_join(struct vxlan_dev *vxlan, const union vxlan_addr *rip, 246 int rifindex); 247 int vxlan_igmp_leave(struct vxlan_dev *vxlan, const union vxlan_addr *rip, 248 int rifindex); 249 250 /* vxlan_mdb.c */ 251 int vxlan_mdb_dump(struct net_device *dev, struct sk_buff *skb, 252 struct netlink_callback *cb); 253 int vxlan_mdb_add(struct net_device *dev, struct nlattr *tb[], u16 nlmsg_flags, 254 struct netlink_ext_ack *extack); 255 int vxlan_mdb_del(struct net_device *dev, struct nlattr *tb[], 256 struct netlink_ext_ack *extack); 257 int vxlan_mdb_del_bulk(struct net_device *dev, struct nlattr *tb[], 258 struct netlink_ext_ack *extack); 259 int vxlan_mdb_get(struct net_device *dev, struct nlattr *tb[], u32 portid, 260 u32 seq, struct netlink_ext_ack *extack); 261 struct vxlan_mdb_entry *vxlan_mdb_entry_skb_get(struct vxlan_dev *vxlan, 262 const struct vxlan_config *cfg, 263 struct sk_buff *skb, 264 __be32 src_vni); 265 netdev_tx_t vxlan_mdb_xmit(struct vxlan_dev *vxlan, 266 const struct vxlan_config *cfg, 267 const struct vxlan_mdb_entry *mdb_entry, 268 struct sk_buff *skb); 269 int vxlan_mdb_init(struct vxlan_dev *vxlan); 270 void vxlan_mdb_fini(struct vxlan_dev *vxlan); 271 #endif 272