388 lines
11 KiB
C
388 lines
11 KiB
C
|
#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/udp_tunnel.h>
|
||
|
|
|
||
|
|
/* 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))
|
||
|
|
|
||
|
|
/* VXLAN-GPE header Next Protocol. */
|
||
|
|
#define VXLAN_GPE_NP_IPV4 0x01
|
||
|
|
#define VXLAN_GPE_NP_IPV6 0x02
|
||
|
|
#define VXLAN_GPE_NP_ETHERNET 0x03
|
||
|
|
#define VXLAN_GPE_NP_NSH 0x04
|
||
|
|
|
||
|
|
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];
|
||
|
|
atomic_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;
|
||
|
|
__be32 remote_vni;
|
||
|
|
u32 remote_ifindex;
|
||
|
|
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;
|
||
|
|
};
|
||
|
|
|
||
|
|
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 */
|
||
|
|
u32 flags; /* VXLAN_F_* in vxlan.h */
|
||
|
|
|
||
|
|
struct timer_list age_timer;
|
||
|
|
spinlock_t hash_lock;
|
||
|
|
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
|
||
|
|
|
||
|
|
/* 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_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 __be16 vxlan_dev_dst_port(struct vxlan_dev *vxlan,
|
||
|
|
unsigned short family)
|
||
|
|
{
|
||
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
||
|
|
if (family == AF_INET6)
|
||
|
|
return inet_sk(vxlan->vn6_sock->sock->sk)->inet_sport;
|
||
|
|
#endif
|
||
|
|
return inet_sk(vxlan->vn4_sock->sock->sk)->inet_sport;
|
||
|
|
}
|
||
|
|
|
||
|
|
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;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* IP header + UDP + VXLAN + Ethernet header */
|
||
|
|
#define VXLAN_HEADROOM (20 + 8 + 8 + 14)
|
||
|
|
/* IPv6 header + UDP + VXLAN + Ethernet header */
|
||
|
|
#define VXLAN6_HEADROOM (40 + 8 + 8 + 14)
|
||
|
|
|
||
|
|
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;
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif
|