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/* SPDX-License-Identifier: GPL-2.0 / #ifndef __NET_VXLAN_H #define __NET_VXLAN_H 1 #include <linux/if_vlan.h> #include <net/udp_tunnel.h> #include <net/dst_metadata.h> #include <net/rtnetlink.h> #include <net/switchdev.h> #define IANA_VXLAN_UDP_PORT 4789 / VXLAN protocol (RFC 7348) header: * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * \|R\|R\|R\|R\|I\|R\|R\|R\| Reserved \| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * \| VXLAN Network Identifier (VNI) \| Reserved \| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * * I = VXLAN Network Identifier (VNI) present. / struct vxlanhdr { __be32 vx_flags; __be32 vx_vni; }; / VXLAN header flags. / #define VXLAN_HF_VNI cpu_to_be32(BIT(27)) #define VXLAN_N_VID (1u << 24) #define VXLAN_VID_MASK (VXLAN_N_VID - 1) #define VXLAN_VNI_MASK cpu_to_be32(VXLAN_VID_MASK << 8) #define VXLAN_HLEN (sizeof(struct udphdr) + sizeof(struct vxlanhdr)) #define VNI_HASH_BITS 10 #define VNI_HASH_SIZE (1<<VNI_HASH_BITS) #define FDB_HASH_BITS 8 #define FDB_HASH_SIZE (1<<FDB_HASH_BITS) / Remote checksum offload for VXLAN (VXLAN_F_REMCSUM_[RT]X): * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * \|R\|R\|R\|R\|I\|R\|R\|R\|R\|R\|C\| Reserved \| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * \| VXLAN Network Identifier (VNI) \|O\| Csum start \| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * * C = Remote checksum offload bit. When set indicates that the * remote checksum offload data is present. * * O = Offset bit. Indicates the checksum offset relative to * checksum start. * * Csum start = Checksum start divided by two. * * http://tools.ietf.org/html/draft-herbert-vxlan-rco / / VXLAN-RCO header flags. / #define VXLAN_HF_RCO cpu_to_be32(BIT(21)) / Remote checksum offload header option / #define VXLAN_RCO_MASK cpu_to_be32(0x7f) / Last byte of vni field / #define VXLAN_RCO_UDP cpu_to_be32(0x80) / Indicate UDP RCO (TCP when not set ) / #define VXLAN_RCO_SHIFT 1 /* Left shift of start / #define VXLAN_RCO_SHIFT_MASK ((1 << VXLAN_RCO_SHIFT) - 1) #define VXLAN_MAX_REMCSUM_START (0x7f << VXLAN_RCO_SHIFT) / * VXLAN Group Based Policy Extension (VXLAN_F_GBP): * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * \|G\|R\|R\|R\|I\|R\|R\|R\|R\|D\|R\|R\|A\|R\|R\|R\| Group Policy ID \| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * \| VXLAN Network Identifier (VNI) \| Reserved \| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * * G = Group Policy ID present. * * D = Don't Learn bit. When set, this bit indicates that the egress * VTEP MUST NOT learn the source address of the encapsulated frame. * * A = Indicates that the group policy has already been applied to * this packet. Policies MUST NOT be applied by devices when the * A bit is set. * * https://tools.ietf.org/html/draft-smith-vxlan-group-policy / struct vxlanhdr_gbp { u8 vx_flags; #ifdef __LITTLE_ENDIAN_BITFIELD u8 reserved_flags1:3, policy_applied:1, reserved_flags2:2, dont_learn:1, reserved_flags3:1; #elif defined(__BIG_ENDIAN_BITFIELD) u8 reserved_flags1:1, dont_learn:1, reserved_flags2:2, policy_applied:1, reserved_flags3:3; #else #error "Please fix <asm/byteorder.h>" #endif __be16 policy_id; __be32 vx_vni; }; / VXLAN-GBP header flags. / #define VXLAN_HF_GBP cpu_to_be32(BIT(31)) #define VXLAN_GBP_USED_BITS (VXLAN_HF_GBP \| cpu_to_be32(0xFFFFFF)) / skb->mark mapping * * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * \|R\|R\|R\|R\|R\|R\|R\|R\|R\|D\|R\|R\|A\|R\|R\|R\| Group Policy ID \| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ / #define VXLAN_GBP_DONT_LEARN (BIT(6) << 16) #define VXLAN_GBP_POLICY_APPLIED (BIT(3) << 16) #define VXLAN_GBP_ID_MASK (0xFFFF) / * VXLAN Generic Protocol Extension (VXLAN_F_GPE): * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * \|R\|R\|Ver\|I\|P\|R\|O\| Reserved \|Next Protocol \| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * \| VXLAN Network Identifier (VNI) \| Reserved \| * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * * Ver = Version. Indicates VXLAN GPE protocol version. * * P = Next Protocol Bit. The P bit is set to indicate that the * Next Protocol field is present. * * O = OAM Flag Bit. The O bit is set to indicate that the packet * is an OAM packet. * * Next Protocol = This 8 bit field indicates the protocol header * immediately following the VXLAN GPE header. * * https://tools.ietf.org/html/draft-ietf-nvo3-vxlan-gpe-01 / struct vxlanhdr_gpe { #if defined(__LITTLE_ENDIAN_BITFIELD) u8 oam_flag:1, reserved_flags1:1, np_applied:1, instance_applied:1, version:2, reserved_flags2:2; #elif defined(__BIG_ENDIAN_BITFIELD) u8 reserved_flags2:2, version:2, instance_applied:1, np_applied:1, reserved_flags1:1, oam_flag:1; #endif u8 reserved_flags3; u8 reserved_flags4; u8 next_protocol; __be32 vx_vni; }; / VXLAN-GPE header flags. / #define VXLAN_HF_VER cpu_to_be32(BIT(29) \| BIT(28)) #define VXLAN_HF_NP cpu_to_be32(BIT(26)) #define VXLAN_HF_OAM cpu_to_be32(BIT(24)) #define VXLAN_GPE_USED_BITS (VXLAN_HF_VER \| VXLAN_HF_NP \| VXLAN_HF_OAM \| \ cpu_to_be32(0xff)) struct vxlan_metadata { u32 gbp; }; / per UDP socket information / struct vxlan_sock { struct hlist_node hlist; struct socket sock; struct hlist_head vni_list[VNI_HASH_SIZE]; refcount_t refcnt; u32 flags; }; union vxlan_addr { struct sockaddr_in sin; struct sockaddr_in6 sin6; struct sockaddr sa; }; struct vxlan_rdst { union vxlan_addr remote_ip; __be16 remote_port; u8 offloaded:1; __be32 remote_vni; u32 remote_ifindex; struct net_device remote_dev; struct list_head list; struct rcu_head rcu; struct dst_cache dst_cache; }; struct vxlan_config { union vxlan_addr remote_ip; union vxlan_addr saddr; __be32 vni; int remote_ifindex; int mtu; __be16 dst_port; u16 port_min; u16 port_max; u8 tos; u8 ttl; __be32 label; u32 flags; unsigned long age_interval; unsigned int addrmax; bool no_share; enum ifla_vxlan_df df; }; struct vxlan_dev_node { struct hlist_node hlist; struct vxlan_dev vxlan; }; /* Pseudo network device / struct vxlan_dev { struct vxlan_dev_node hlist4; / vni hash table for IPv4 socket / #if IS_ENABLED(CONFIG_IPV6) struct vxlan_dev_node hlist6; / vni hash table for IPv6 socket / #endif struct list_head next; / vxlan's per namespace list / struct vxlan_sock __rcu vn4_sock; /* listening socket for IPv4 / #if IS_ENABLED(CONFIG_IPV6) struct vxlan_sock __rcu vn6_sock; /* listening socket for IPv6 / #endif struct net_device dev; struct net net; / netns for packet i/o / struct vxlan_rdst default_dst; / default destination / struct ip_tunnel_fan fan; struct timer_list age_timer; spinlock_t hash_lock[FDB_HASH_SIZE]; unsigned int addrcnt; struct gro_cells gro_cells; struct vxlan_config cfg; struct hlist_head fdb_head[FDB_HASH_SIZE]; }; #define VXLAN_F_LEARN 0x01 #define VXLAN_F_PROXY 0x02 #define VXLAN_F_RSC 0x04 #define VXLAN_F_L2MISS 0x08 #define VXLAN_F_L3MISS 0x10 #define VXLAN_F_IPV6 0x20 #define VXLAN_F_UDP_ZERO_CSUM_TX 0x40 #define VXLAN_F_UDP_ZERO_CSUM6_TX 0x80 #define VXLAN_F_UDP_ZERO_CSUM6_RX 0x100 #define VXLAN_F_REMCSUM_TX 0x200 #define VXLAN_F_REMCSUM_RX 0x400 #define VXLAN_F_GBP 0x800 #define VXLAN_F_REMCSUM_NOPARTIAL 0x1000 #define VXLAN_F_COLLECT_METADATA 0x2000 #define VXLAN_F_GPE 0x4000 #define VXLAN_F_IPV6_LINKLOCAL 0x8000 #define VXLAN_F_TTL_INHERIT 0x10000 / Flags that are used in the receive path. These flags must match in * order for a socket to be shareable / #define VXLAN_F_RCV_FLAGS (VXLAN_F_GBP \| \ VXLAN_F_GPE \| \ VXLAN_F_UDP_ZERO_CSUM6_RX \| \ VXLAN_F_REMCSUM_RX \| \ VXLAN_F_REMCSUM_NOPARTIAL \| \ VXLAN_F_COLLECT_METADATA) / Flags that can be set together with VXLAN_F_GPE. / #define VXLAN_F_ALLOWED_GPE (VXLAN_F_GPE \| \ VXLAN_F_IPV6 \| \ VXLAN_F_IPV6_LINKLOCAL \| \ VXLAN_F_UDP_ZERO_CSUM_TX \| \ VXLAN_F_UDP_ZERO_CSUM6_TX \| \ VXLAN_F_UDP_ZERO_CSUM6_RX \| \ VXLAN_F_COLLECT_METADATA) struct net_device vxlan_dev_create(struct net net, const char name, u8 name_assign_type, struct vxlan_config conf); static inline netdev_features_t vxlan_features_check(struct sk_buff skb, netdev_features_t features) { u8 l4_hdr = 0; if (!skb->encapsulation) return features; switch (vlan_get_protocol(skb)) { case htons(ETH_P_IP): l4_hdr = ip_hdr(skb)->protocol; break; case htons(ETH_P_IPV6): l4_hdr = ipv6_hdr(skb)->nexthdr; break; default: return features; } if ((l4_hdr == IPPROTO_UDP) && (skb->inner_protocol_type != ENCAP_TYPE_ETHER \|\| skb->inner_protocol != htons(ETH_P_TEB) \|\| (skb_inner_mac_header(skb) - skb_transport_header(skb) != sizeof(struct udphdr) + sizeof(struct vxlanhdr)) \|\| (skb->ip_summed != CHECKSUM_NONE && !can_checksum_protocol(features, inner_eth_hdr(skb)->h_proto)))) return features & ~(NETIF_F_CSUM_MASK \| NETIF_F_GSO_MASK); return features; } static inline int vxlan_headroom(u32 flags) { /* VXLAN: IP4/6 header + UDP + VXLAN + Ethernet header / / VXLAN-GPE: IP4/6 header + UDP + VXLAN / return (flags & VXLAN_F_IPV6 ? sizeof(struct ipv6hdr) : sizeof(struct iphdr)) + sizeof(struct udphdr) + sizeof(struct vxlanhdr) + (flags & VXLAN_F_GPE ? 0 : ETH_HLEN); } static inline struct vxlanhdr vxlan_hdr(struct sk_buff skb) { return (struct vxlanhdr )(udp_hdr(skb) + 1); } static inline __be32 vxlan_vni(__be32 vni_field) { #if defined(__BIG_ENDIAN) return (__force __be32)((__force u32)vni_field >> 8); #else return (__force __be32)((__force u32)(vni_field & VXLAN_VNI_MASK) << 8); #endif } static inline __be32 vxlan_vni_field(__be32 vni) { #if defined(__BIG_ENDIAN) return (__force __be32)((__force u32)vni << 8); #else return (__force __be32)((__force u32)vni >> 8); #endif } static inline size_t vxlan_rco_start(__be32 vni_field) { return be32_to_cpu(vni_field & VXLAN_RCO_MASK) << VXLAN_RCO_SHIFT; } static inline size_t vxlan_rco_offset(__be32 vni_field) { return (vni_field & VXLAN_RCO_UDP) ? offsetof(struct udphdr, check) : offsetof(struct tcphdr, check); } static inline __be32 vxlan_compute_rco(unsigned int start, unsigned int offset) { __be32 vni_field = cpu_to_be32(start >> VXLAN_RCO_SHIFT); if (offset == offsetof(struct udphdr, check)) vni_field \|= VXLAN_RCO_UDP; return vni_field; } static inline unsigned short vxlan_get_sk_family(struct vxlan_sock vs) { return vs->sock->sk->sk_family; } #if IS_ENABLED(CONFIG_IPV6) static inline bool vxlan_addr_any(const union vxlan_addr ipa) { if (ipa->sa.sa_family == AF_INET6) return ipv6_addr_any(&ipa->sin6.sin6_addr); else return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY); } static inline bool vxlan_addr_multicast(const union vxlan_addr ipa) { if (ipa->sa.sa_family == AF_INET6) return ipv6_addr_is_multicast(&ipa->sin6.sin6_addr); else return ipv4_is_multicast(ipa->sin.sin_addr.s_addr); } #else / !IS_ENABLED(CONFIG_IPV6) / static inline bool vxlan_addr_any(const union vxlan_addr ipa) { return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY); } static inline bool vxlan_addr_multicast(const union vxlan_addr ipa) { return ipv4_is_multicast(ipa->sin.sin_addr.s_addr); } #endif / IS_ENABLED(CONFIG_IPV6) / static inline bool netif_is_vxlan(const struct net_device dev) { return dev->rtnl_link_ops && !strcmp(dev->rtnl_link_ops->kind, "vxlan"); } struct switchdev_notifier_vxlan_fdb_info { struct switchdev_notifier_info info; /* must be first / union vxlan_addr remote_ip; __be16 remote_port; __be32 remote_vni; u32 remote_ifindex; u8 eth_addr[ETH_ALEN]; __be32 vni; bool offloaded; bool added_by_user; }; #if IS_ENABLED(CONFIG_VXLAN) int vxlan_fdb_find_uc(struct net_device dev, const u8 mac, __be32 vni, struct switchdev_notifier_vxlan_fdb_info fdb_info); int vxlan_fdb_replay(const struct net_device dev, __be32 vni, struct notifier_block nb, struct netlink_ext_ack extack); void vxlan_fdb_clear_offload(const struct net_device dev, __be32 vni); #else static inline int vxlan_fdb_find_uc(struct net_device dev, const u8 mac, __be32 vni, struct switchdev_notifier_vxlan_fdb_info fdb_info) { return -ENOENT; } static inline int vxlan_fdb_replay(const struct net_device dev, __be32 vni, struct notifier_block nb, struct netlink_ext_ack extack) { return -EOPNOTSUPP; } static inline void vxlan_fdb_clear_offload(const struct net_device dev, __be32 vni) { } #endif static inline void vxlan_flag_attr_error(int attrtype, struct netlink_ext_ack extack) { #define VXLAN_FLAG(flg) \ case IFLA_VXLAN_##flg: \ NL_SET_ERR_MSG_MOD(extack, \ "cannot change " #flg " flag"); \ break switch (attrtype) { VXLAN_FLAG(TTL_INHERIT); VXLAN_FLAG(LEARNING); VXLAN_FLAG(PROXY); VXLAN_FLAG(RSC); VXLAN_FLAG(L2MISS); VXLAN_FLAG(L3MISS); VXLAN_FLAG(COLLECT_METADATA); VXLAN_FLAG(UDP_ZERO_CSUM6_TX); VXLAN_FLAG(UDP_ZERO_CSUM6_RX); VXLAN_FLAG(REMCSUM_TX); VXLAN_FLAG(REMCSUM_RX); VXLAN_FLAG(GBP); VXLAN_FLAG(GPE); VXLAN_FLAG(REMCSUM_NOPARTIAL); default: NL_SET_ERR_MSG_MOD(extack, \ "cannot change flag"); break; } #undef VXLAN_FLAG } #endif

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