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518 lines
14 KiB
518 lines
14 KiB
/* 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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|
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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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#include <net/rtnetlink.h> |
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#include <net/switchdev.h> |
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#include <net/nexthop.h> |
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|
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#define IANA_VXLAN_UDP_PORT 4789 |
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|
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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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|
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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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#define VXLAN_GBP_MASK (VXLAN_GBP_DONT_LEARN | VXLAN_GBP_POLICY_APPLIED | \ |
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VXLAN_GBP_ID_MASK) |
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|
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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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u8 offloaded:1; |
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__be32 remote_vni; |
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u32 remote_ifindex; |
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struct net_device *remote_dev; |
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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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enum ifla_vxlan_df df; |
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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[FDB_HASH_SIZE]; |
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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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#if IS_ENABLED(CONFIG_IPV6) |
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static inline bool vxlan_addr_any(const union vxlan_addr *ipa) |
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{ |
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if (ipa->sa.sa_family == AF_INET6) |
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return ipv6_addr_any(&ipa->sin6.sin6_addr); |
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else |
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return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY); |
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} |
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static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa) |
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{ |
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if (ipa->sa.sa_family == AF_INET6) |
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return ipv6_addr_is_multicast(&ipa->sin6.sin6_addr); |
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else |
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return ipv4_is_multicast(ipa->sin.sin_addr.s_addr); |
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} |
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#else /* !IS_ENABLED(CONFIG_IPV6) */ |
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static inline bool vxlan_addr_any(const union vxlan_addr *ipa) |
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{ |
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return ipa->sin.sin_addr.s_addr == htonl(INADDR_ANY); |
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} |
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static inline bool vxlan_addr_multicast(const union vxlan_addr *ipa) |
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{ |
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return ipv4_is_multicast(ipa->sin.sin_addr.s_addr); |
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} |
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#endif /* IS_ENABLED(CONFIG_IPV6) */ |
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static inline bool netif_is_vxlan(const struct net_device *dev) |
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{ |
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return dev->rtnl_link_ops && |
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!strcmp(dev->rtnl_link_ops->kind, "vxlan"); |
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} |
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struct switchdev_notifier_vxlan_fdb_info { |
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struct switchdev_notifier_info info; /* must be first */ |
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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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u8 eth_addr[ETH_ALEN]; |
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__be32 vni; |
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bool offloaded; |
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bool added_by_user; |
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}; |
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#if IS_ENABLED(CONFIG_VXLAN) |
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int vxlan_fdb_find_uc(struct net_device *dev, const u8 *mac, __be32 vni, |
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struct switchdev_notifier_vxlan_fdb_info *fdb_info); |
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int vxlan_fdb_replay(const struct net_device *dev, __be32 vni, |
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struct notifier_block *nb, |
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struct netlink_ext_ack *extack); |
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void vxlan_fdb_clear_offload(const struct net_device *dev, __be32 vni); |
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|
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#else |
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static inline int |
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vxlan_fdb_find_uc(struct net_device *dev, const u8 *mac, __be32 vni, |
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struct switchdev_notifier_vxlan_fdb_info *fdb_info) |
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{ |
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return -ENOENT; |
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} |
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static inline int vxlan_fdb_replay(const struct net_device *dev, __be32 vni, |
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struct notifier_block *nb, |
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struct netlink_ext_ack *extack) |
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{ |
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return -EOPNOTSUPP; |
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} |
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static inline void |
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vxlan_fdb_clear_offload(const struct net_device *dev, __be32 vni) |
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{ |
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} |
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#endif |
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static inline void vxlan_flag_attr_error(int attrtype, |
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struct netlink_ext_ack *extack) |
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{ |
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#define VXLAN_FLAG(flg) \ |
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case IFLA_VXLAN_##flg: \ |
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NL_SET_ERR_MSG_MOD(extack, \ |
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"cannot change " #flg " flag"); \ |
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break |
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switch (attrtype) { |
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VXLAN_FLAG(TTL_INHERIT); |
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VXLAN_FLAG(LEARNING); |
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VXLAN_FLAG(PROXY); |
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VXLAN_FLAG(RSC); |
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VXLAN_FLAG(L2MISS); |
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VXLAN_FLAG(L3MISS); |
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VXLAN_FLAG(COLLECT_METADATA); |
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VXLAN_FLAG(UDP_ZERO_CSUM6_TX); |
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VXLAN_FLAG(UDP_ZERO_CSUM6_RX); |
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VXLAN_FLAG(REMCSUM_TX); |
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VXLAN_FLAG(REMCSUM_RX); |
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VXLAN_FLAG(GBP); |
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VXLAN_FLAG(GPE); |
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VXLAN_FLAG(REMCSUM_NOPARTIAL); |
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default: |
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NL_SET_ERR_MSG_MOD(extack, \ |
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"cannot change flag"); |
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break; |
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} |
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#undef VXLAN_FLAG |
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} |
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static inline bool vxlan_fdb_nh_path_select(struct nexthop *nh, |
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int hash, |
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struct vxlan_rdst *rdst) |
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{ |
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struct fib_nh_common *nhc; |
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nhc = nexthop_path_fdb_result(nh, hash); |
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if (unlikely(!nhc)) |
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return false; |
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switch (nhc->nhc_gw_family) { |
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case AF_INET: |
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rdst->remote_ip.sin.sin_addr.s_addr = nhc->nhc_gw.ipv4; |
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rdst->remote_ip.sa.sa_family = AF_INET; |
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break; |
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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
|
|
|