374 строки
10 KiB
C
374 строки
10 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __NET_VXLAN_H
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#define __NET_VXLAN_H 1
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#include <linux/if_vlan.h>
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#include <net/udp_tunnel.h>
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#include <net/dst_metadata.h>
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/* VXLAN protocol (RFC 7348) header:
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* |R|R|R|R|I|R|R|R| Reserved |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | VXLAN Network Identifier (VNI) | Reserved |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*
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* I = VXLAN Network Identifier (VNI) present.
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*/
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struct vxlanhdr {
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__be32 vx_flags;
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__be32 vx_vni;
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};
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/* VXLAN header flags. */
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#define VXLAN_HF_VNI cpu_to_be32(BIT(27))
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#define VXLAN_N_VID (1u << 24)
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#define VXLAN_VID_MASK (VXLAN_N_VID - 1)
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#define VXLAN_VNI_MASK cpu_to_be32(VXLAN_VID_MASK << 8)
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#define VXLAN_HLEN (sizeof(struct udphdr) + sizeof(struct vxlanhdr))
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#define VNI_HASH_BITS 10
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#define VNI_HASH_SIZE (1<<VNI_HASH_BITS)
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#define FDB_HASH_BITS 8
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#define FDB_HASH_SIZE (1<<FDB_HASH_BITS)
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/* Remote checksum offload for VXLAN (VXLAN_F_REMCSUM_[RT]X):
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* |R|R|R|R|I|R|R|R|R|R|C| Reserved |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | VXLAN Network Identifier (VNI) |O| Csum start |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*
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* C = Remote checksum offload bit. When set indicates that the
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* remote checksum offload data is present.
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*
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* O = Offset bit. Indicates the checksum offset relative to
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* checksum start.
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*
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* Csum start = Checksum start divided by two.
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*
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* http://tools.ietf.org/html/draft-herbert-vxlan-rco
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*/
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/* VXLAN-RCO header flags. */
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#define VXLAN_HF_RCO cpu_to_be32(BIT(21))
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/* Remote checksum offload header option */
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#define VXLAN_RCO_MASK cpu_to_be32(0x7f) /* Last byte of vni field */
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#define VXLAN_RCO_UDP cpu_to_be32(0x80) /* Indicate UDP RCO (TCP when not set *) */
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#define VXLAN_RCO_SHIFT 1 /* Left shift of start */
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#define VXLAN_RCO_SHIFT_MASK ((1 << VXLAN_RCO_SHIFT) - 1)
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#define VXLAN_MAX_REMCSUM_START (0x7f << VXLAN_RCO_SHIFT)
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/*
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* VXLAN Group Based Policy Extension (VXLAN_F_GBP):
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* |G|R|R|R|I|R|R|R|R|D|R|R|A|R|R|R| Group Policy ID |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | VXLAN Network Identifier (VNI) | Reserved |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*
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* G = Group Policy ID present.
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*
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* D = Don't Learn bit. When set, this bit indicates that the egress
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* VTEP MUST NOT learn the source address of the encapsulated frame.
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*
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* A = Indicates that the group policy has already been applied to
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* this packet. Policies MUST NOT be applied by devices when the
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* A bit is set.
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*
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* https://tools.ietf.org/html/draft-smith-vxlan-group-policy
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*/
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struct vxlanhdr_gbp {
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u8 vx_flags;
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#ifdef __LITTLE_ENDIAN_BITFIELD
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u8 reserved_flags1:3,
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policy_applied:1,
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reserved_flags2:2,
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dont_learn:1,
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reserved_flags3:1;
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#elif defined(__BIG_ENDIAN_BITFIELD)
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u8 reserved_flags1:1,
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dont_learn:1,
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reserved_flags2:2,
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policy_applied:1,
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reserved_flags3:3;
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#else
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#error "Please fix <asm/byteorder.h>"
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#endif
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__be16 policy_id;
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__be32 vx_vni;
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};
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/* VXLAN-GBP header flags. */
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#define VXLAN_HF_GBP cpu_to_be32(BIT(31))
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#define VXLAN_GBP_USED_BITS (VXLAN_HF_GBP | cpu_to_be32(0xFFFFFF))
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/* skb->mark mapping
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*
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* |R|R|R|R|R|R|R|R|R|D|R|R|A|R|R|R| Group Policy ID |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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#define VXLAN_GBP_DONT_LEARN (BIT(6) << 16)
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#define VXLAN_GBP_POLICY_APPLIED (BIT(3) << 16)
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#define VXLAN_GBP_ID_MASK (0xFFFF)
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/*
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* VXLAN Generic Protocol Extension (VXLAN_F_GPE):
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* |R|R|Ver|I|P|R|O| Reserved |Next Protocol |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | VXLAN Network Identifier (VNI) | Reserved |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*
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* Ver = Version. Indicates VXLAN GPE protocol version.
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*
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* P = Next Protocol Bit. The P bit is set to indicate that the
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* Next Protocol field is present.
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*
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* O = OAM Flag Bit. The O bit is set to indicate that the packet
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* is an OAM packet.
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*
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* Next Protocol = This 8 bit field indicates the protocol header
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* immediately following the VXLAN GPE header.
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*
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* https://tools.ietf.org/html/draft-ietf-nvo3-vxlan-gpe-01
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*/
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struct vxlanhdr_gpe {
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#if defined(__LITTLE_ENDIAN_BITFIELD)
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u8 oam_flag:1,
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reserved_flags1:1,
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np_applied:1,
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instance_applied:1,
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version:2,
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reserved_flags2:2;
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#elif defined(__BIG_ENDIAN_BITFIELD)
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u8 reserved_flags2:2,
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version:2,
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instance_applied:1,
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np_applied:1,
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reserved_flags1:1,
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oam_flag:1;
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#endif
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u8 reserved_flags3;
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u8 reserved_flags4;
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u8 next_protocol;
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__be32 vx_vni;
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};
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/* VXLAN-GPE header flags. */
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#define VXLAN_HF_VER cpu_to_be32(BIT(29) | BIT(28))
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#define VXLAN_HF_NP cpu_to_be32(BIT(26))
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#define VXLAN_HF_OAM cpu_to_be32(BIT(24))
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#define VXLAN_GPE_USED_BITS (VXLAN_HF_VER | VXLAN_HF_NP | VXLAN_HF_OAM | \
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cpu_to_be32(0xff))
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struct vxlan_metadata {
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u32 gbp;
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};
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/* per UDP socket information */
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struct vxlan_sock {
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struct hlist_node hlist;
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struct socket *sock;
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struct hlist_head vni_list[VNI_HASH_SIZE];
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refcount_t refcnt;
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u32 flags;
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};
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union vxlan_addr {
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struct sockaddr_in sin;
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struct sockaddr_in6 sin6;
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struct sockaddr sa;
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};
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struct vxlan_rdst {
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union vxlan_addr remote_ip;
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__be16 remote_port;
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__be32 remote_vni;
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u32 remote_ifindex;
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struct list_head list;
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struct rcu_head rcu;
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struct dst_cache dst_cache;
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};
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struct vxlan_config {
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union vxlan_addr remote_ip;
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union vxlan_addr saddr;
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__be32 vni;
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int remote_ifindex;
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int mtu;
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__be16 dst_port;
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u16 port_min;
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u16 port_max;
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u8 tos;
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u8 ttl;
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__be32 label;
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u32 flags;
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unsigned long age_interval;
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unsigned int addrmax;
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bool no_share;
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};
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struct vxlan_dev_node {
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struct hlist_node hlist;
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struct vxlan_dev *vxlan;
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};
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/* Pseudo network device */
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struct vxlan_dev {
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struct vxlan_dev_node hlist4; /* vni hash table for IPv4 socket */
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#if IS_ENABLED(CONFIG_IPV6)
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struct vxlan_dev_node hlist6; /* vni hash table for IPv6 socket */
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#endif
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struct list_head next; /* vxlan's per namespace list */
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struct vxlan_sock __rcu *vn4_sock; /* listening socket for IPv4 */
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#if IS_ENABLED(CONFIG_IPV6)
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struct vxlan_sock __rcu *vn6_sock; /* listening socket for IPv6 */
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#endif
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struct net_device *dev;
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struct net *net; /* netns for packet i/o */
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struct vxlan_rdst default_dst; /* default destination */
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struct timer_list age_timer;
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spinlock_t hash_lock;
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unsigned int addrcnt;
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struct gro_cells gro_cells;
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struct vxlan_config cfg;
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struct hlist_head fdb_head[FDB_HASH_SIZE];
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};
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#define VXLAN_F_LEARN 0x01
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#define VXLAN_F_PROXY 0x02
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#define VXLAN_F_RSC 0x04
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#define VXLAN_F_L2MISS 0x08
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#define VXLAN_F_L3MISS 0x10
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#define VXLAN_F_IPV6 0x20
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#define VXLAN_F_UDP_ZERO_CSUM_TX 0x40
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#define VXLAN_F_UDP_ZERO_CSUM6_TX 0x80
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#define VXLAN_F_UDP_ZERO_CSUM6_RX 0x100
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#define VXLAN_F_REMCSUM_TX 0x200
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#define VXLAN_F_REMCSUM_RX 0x400
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#define VXLAN_F_GBP 0x800
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#define VXLAN_F_REMCSUM_NOPARTIAL 0x1000
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#define VXLAN_F_COLLECT_METADATA 0x2000
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#define VXLAN_F_GPE 0x4000
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#define VXLAN_F_IPV6_LINKLOCAL 0x8000
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#define VXLAN_F_TTL_INHERIT 0x10000
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/* Flags that are used in the receive path. These flags must match in
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* order for a socket to be shareable
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*/
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#define VXLAN_F_RCV_FLAGS (VXLAN_F_GBP | \
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VXLAN_F_GPE | \
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VXLAN_F_UDP_ZERO_CSUM6_RX | \
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VXLAN_F_REMCSUM_RX | \
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VXLAN_F_REMCSUM_NOPARTIAL | \
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VXLAN_F_COLLECT_METADATA)
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/* Flags that can be set together with VXLAN_F_GPE. */
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#define VXLAN_F_ALLOWED_GPE (VXLAN_F_GPE | \
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VXLAN_F_IPV6 | \
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VXLAN_F_IPV6_LINKLOCAL | \
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VXLAN_F_UDP_ZERO_CSUM_TX | \
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VXLAN_F_UDP_ZERO_CSUM6_TX | \
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VXLAN_F_UDP_ZERO_CSUM6_RX | \
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VXLAN_F_COLLECT_METADATA)
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struct net_device *vxlan_dev_create(struct net *net, const char *name,
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u8 name_assign_type, struct vxlan_config *conf);
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static inline netdev_features_t vxlan_features_check(struct sk_buff *skb,
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netdev_features_t features)
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{
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u8 l4_hdr = 0;
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if (!skb->encapsulation)
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return features;
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switch (vlan_get_protocol(skb)) {
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case htons(ETH_P_IP):
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l4_hdr = ip_hdr(skb)->protocol;
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break;
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case htons(ETH_P_IPV6):
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l4_hdr = ipv6_hdr(skb)->nexthdr;
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break;
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default:
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return features;
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}
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if ((l4_hdr == IPPROTO_UDP) &&
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(skb->inner_protocol_type != ENCAP_TYPE_ETHER ||
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skb->inner_protocol != htons(ETH_P_TEB) ||
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(skb_inner_mac_header(skb) - skb_transport_header(skb) !=
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sizeof(struct udphdr) + sizeof(struct vxlanhdr)) ||
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(skb->ip_summed != CHECKSUM_NONE &&
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!can_checksum_protocol(features, inner_eth_hdr(skb)->h_proto))))
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return features & ~(NETIF_F_CSUM_MASK | NETIF_F_GSO_MASK);
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return features;
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}
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/* IP header + UDP + VXLAN + Ethernet header */
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#define VXLAN_HEADROOM (20 + 8 + 8 + 14)
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/* IPv6 header + UDP + VXLAN + Ethernet header */
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#define VXLAN6_HEADROOM (40 + 8 + 8 + 14)
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static inline struct vxlanhdr *vxlan_hdr(struct sk_buff *skb)
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{
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return (struct vxlanhdr *)(udp_hdr(skb) + 1);
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}
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static inline __be32 vxlan_vni(__be32 vni_field)
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{
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#if defined(__BIG_ENDIAN)
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return (__force __be32)((__force u32)vni_field >> 8);
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#else
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return (__force __be32)((__force u32)(vni_field & VXLAN_VNI_MASK) << 8);
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#endif
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}
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static inline __be32 vxlan_vni_field(__be32 vni)
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{
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#if defined(__BIG_ENDIAN)
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return (__force __be32)((__force u32)vni << 8);
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#else
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return (__force __be32)((__force u32)vni >> 8);
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#endif
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}
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static inline size_t vxlan_rco_start(__be32 vni_field)
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{
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return be32_to_cpu(vni_field & VXLAN_RCO_MASK) << VXLAN_RCO_SHIFT;
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}
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static inline size_t vxlan_rco_offset(__be32 vni_field)
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{
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return (vni_field & VXLAN_RCO_UDP) ?
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offsetof(struct udphdr, check) :
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offsetof(struct tcphdr, check);
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}
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static inline __be32 vxlan_compute_rco(unsigned int start, unsigned int offset)
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{
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__be32 vni_field = cpu_to_be32(start >> VXLAN_RCO_SHIFT);
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if (offset == offsetof(struct udphdr, check))
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vni_field |= VXLAN_RCO_UDP;
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return vni_field;
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}
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static inline unsigned short vxlan_get_sk_family(struct vxlan_sock *vs)
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{
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return vs->sock->sk->sk_family;
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}
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#endif
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