net/vxlan/vxlan_private.h

0001 /* SPDX-License-Identifier: GPL-2.0 */
0002 /*
0003  *  Vxlan private header file
0004  *
0005  */
0006
0007 #ifndef _VXLAN_PRIVATE_H
0008 #define _VXLAN_PRIVATE_H
0009
0010 #include <linux/rhashtable.h>
0011
0012 extern unsigned int vxlan_net_id;
0013 extern const u8 all_zeros_mac[ETH_ALEN + 2];
0014 extern const struct rhashtable_params vxlan_vni_rht_params;
0015
0016 #define PORT_HASH_BITS  8
0017 #define PORT_HASH_SIZE  (1 << PORT_HASH_BITS)
0018
0019 /* per-network namespace private data for this module */
0020 struct vxlan_net {
0021     struct list_head  vxlan_list;
0022     struct hlist_head sock_list[PORT_HASH_SIZE];
0023     spinlock_t    sock_lock;
0024     struct notifier_block nexthop_notifier_block;
0025 };
0026
0027 /* Forwarding table entry */
0028 struct vxlan_fdb {
0029     struct hlist_node hlist;    /* linked list of entries */
0030     struct rcu_head   rcu;
0031     unsigned long     updated;  /* jiffies */
0032     unsigned long     used;
0033     struct list_head  remotes;
0034     u8        eth_addr[ETH_ALEN];
0035     u16       state;    /* see ndm_state */
0036     __be32        vni;
0037     u16       flags;    /* see ndm_flags and below */
0038     struct list_head  nh_list;
0039     struct nexthop __rcu *nh;
0040     struct vxlan_dev  __rcu *vdev;
0041 };
0042
0043 #define NTF_VXLAN_ADDED_BY_USER 0x100
0044
0045 /* Virtual Network hash table head */
0046 static inline struct hlist_head *vni_head(struct vxlan_sock *vs, __be32 vni)
0047 {
0048     return &vs->vni_list[hash_32((__force u32)vni, VNI_HASH_BITS)];
0049 }
0050
0051 /* Socket hash table head */
0052 static inline struct hlist_head *vs_head(struct net *net, __be16 port)
0053 {
0054     struct vxlan_net *vn = net_generic(net, vxlan_net_id);
0055
0056     return &vn->sock_list[hash_32(ntohs(port), PORT_HASH_BITS)];
0057 }
0058
0059 /* First remote destination for a forwarding entry.
0060  * Guaranteed to be non-NULL because remotes are never deleted.
0061  */
0062 static inline struct vxlan_rdst *first_remote_rcu(struct vxlan_fdb *fdb)
0063 {
0064     if (rcu_access_pointer(fdb->nh))
0065         return NULL;
0066     return list_entry_rcu(fdb->remotes.next, struct vxlan_rdst, list);
0067 }
0068
0069 static inline struct vxlan_rdst *first_remote_rtnl(struct vxlan_fdb *fdb)
0070 {
0071     if (rcu_access_pointer(fdb->nh))
0072         return NULL;
0073     return list_first_entry(&fdb->remotes, struct vxlan_rdst, list);
0074 }
0075
0076 #if IS_ENABLED(CONFIG_IPV6)
0077 static inline
0078 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
0079 {
0080     if (a->sa.sa_family != b->sa.sa_family)
0081         return false;
0082     if (a->sa.sa_family == AF_INET6)
0083         return ipv6_addr_equal(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
0084     else
0085         return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
0086 }
0087
0088 #else /* !CONFIG_IPV6 */
0089
0090 static inline
0091 bool vxlan_addr_equal(const union vxlan_addr *a, const union vxlan_addr *b)
0092 {
0093     return a->sin.sin_addr.s_addr == b->sin.sin_addr.s_addr;
0094 }
0095
0096 #endif
0097
0098 static inline struct vxlan_vni_node *
0099 vxlan_vnifilter_lookup(struct vxlan_dev *vxlan, __be32 vni)
0100 {
0101     struct vxlan_vni_group *vg;
0102
0103     vg = rcu_dereference_rtnl(vxlan->vnigrp);
0104     if (!vg)
0105         return NULL;
0106
0107     return rhashtable_lookup_fast(&vg->vni_hash, &vni,
0108                       vxlan_vni_rht_params);
0109 }
0110
0111 /* vxlan_core.c */
0112 int vxlan_fdb_create(struct vxlan_dev *vxlan,
0113              const u8 *mac, union vxlan_addr *ip,
0114              __u16 state, __be16 port, __be32 src_vni,
0115              __be32 vni, __u32 ifindex, __u16 ndm_flags,
0116              u32 nhid, struct vxlan_fdb **fdb,
0117              struct netlink_ext_ack *extack);
0118 int __vxlan_fdb_delete(struct vxlan_dev *vxlan,
0119                const unsigned char *addr, union vxlan_addr ip,
0120                __be16 port, __be32 src_vni, __be32 vni,
0121                u32 ifindex, bool swdev_notify);
0122 u32 eth_vni_hash(const unsigned char *addr, __be32 vni);
0123 u32 fdb_head_index(struct vxlan_dev *vxlan, const u8 *mac, __be32 vni);
0124 int vxlan_fdb_update(struct vxlan_dev *vxlan,
0125              const u8 *mac, union vxlan_addr *ip,
0126              __u16 state, __u16 flags,
0127              __be16 port, __be32 src_vni, __be32 vni,
0128              __u32 ifindex, __u16 ndm_flags, u32 nhid,
0129              bool swdev_notify, struct netlink_ext_ack *extack);
0130 int vxlan_vni_in_use(struct net *src_net, struct vxlan_dev *vxlan,
0131              struct vxlan_config *conf, __be32 vni);
0132
0133 /* vxlan_vnifilter.c */
0134 int vxlan_vnigroup_init(struct vxlan_dev *vxlan);
0135 void vxlan_vnigroup_uninit(struct vxlan_dev *vxlan);
0136
0137 void vxlan_vnifilter_init(void);
0138 void vxlan_vnifilter_uninit(void);
0139 void vxlan_vnifilter_count(struct vxlan_dev *vxlan, __be32 vni,
0140                struct vxlan_vni_node *vninode,
0141                int type, unsigned int len);
0142
0143 void vxlan_vs_add_vnigrp(struct vxlan_dev *vxlan,
0144              struct vxlan_sock *vs,
0145              bool ipv6);
0146 void vxlan_vs_del_vnigrp(struct vxlan_dev *vxlan);
0147 int vxlan_vnilist_update_group(struct vxlan_dev *vxlan,
0148                    union vxlan_addr *old_remote_ip,
0149                    union vxlan_addr *new_remote_ip,
0150                    struct netlink_ext_ack *extack);
0151
0152
0153 /* vxlan_multicast.c */
0154 int vxlan_multicast_join(struct vxlan_dev *vxlan);
0155 int vxlan_multicast_leave(struct vxlan_dev *vxlan);
0156 bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev,
0157               __be32 vni, union vxlan_addr *rip, int rifindex);
0158 int vxlan_igmp_join(struct vxlan_dev *vxlan, union vxlan_addr *rip,
0159             int rifindex);
0160 int vxlan_igmp_leave(struct vxlan_dev *vxlan, union vxlan_addr *rip,
0161              int rifindex);
0162 #endif