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-rw-r--r--include/net/vxlan.h523
1 files changed, 523 insertions, 0 deletions
diff --git a/include/net/vxlan.h b/include/net/vxlan.h
new file mode 100644
index 000000000..e149a0b6f
--- /dev/null
+++ b/include/net/vxlan.h
@@ -0,0 +1,523 @@
+/* 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>
+#include <net/nexthop.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)
+
+#define VXLAN_GBP_MASK (VXLAN_GBP_DONT_LEARN | VXLAN_GBP_POLICY_APPLIED | \
+ VXLAN_GBP_ID_MASK)
+
+/*
+ * 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 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
+}
+
+static inline bool vxlan_fdb_nh_path_select(struct nexthop *nh,
+ u32 hash,
+ struct vxlan_rdst *rdst)
+{
+ struct fib_nh_common *nhc;
+
+ nhc = nexthop_path_fdb_result(nh, hash >> 1);
+ if (unlikely(!nhc))
+ return false;
+
+ switch (nhc->nhc_gw_family) {
+ case AF_INET:
+ rdst->remote_ip.sin.sin_addr.s_addr = nhc->nhc_gw.ipv4;
+ rdst->remote_ip.sa.sa_family = AF_INET;
+ break;
+ case AF_INET6:
+ rdst->remote_ip.sin6.sin6_addr = nhc->nhc_gw.ipv6;
+ rdst->remote_ip.sa.sa_family = AF_INET6;
+ break;
+ }
+
+ return true;
+}
+
+#endif
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