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linux/include/net/vxlan.h
Vladimir Nikishkin 69474a8a58 net: vxlan: Add nolocalbypass option to vxlan. 
If a packet needs to be encapsulated towards a local destination IP, the
packet will undergo a "local bypass" and be injected into the Rx path as
if it was received by the target VXLAN device without undergoing
encapsulation. If such a device does not exist, the packet will be
dropped.

There are scenarios where we do not want to perform such a bypass, but
instead want the packet to be encapsulated and locally received by a
user space program for post-processing.

To that end, add a new VXLAN device attribute that controls whether a
"local bypass" is performed or not. Default to performing a bypass to
maintain existing behavior.

Signed-off-by: Vladimir Nikishkin <vladimir@nikishkin.pw>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2023-05-13 17:02:33 +01:00

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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __NET_VXLAN_H
#define __NET_VXLAN_H 1
#include <linux/if_vlan.h>
#include <linux/rhashtable-types.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
#define IANA_VXLAN_GPE_UDP_PORT 4790
/* 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;
};
enum {
VXLAN_VNI_STATS_RX,
VXLAN_VNI_STATS_RX_DROPS,
VXLAN_VNI_STATS_RX_ERRORS,
VXLAN_VNI_STATS_TX,
VXLAN_VNI_STATS_TX_DROPS,
VXLAN_VNI_STATS_TX_ERRORS,
};
struct vxlan_vni_stats {
u64 rx_packets;
u64 rx_bytes;
u64 rx_drops;
u64 rx_errors;
u64 tx_packets;
u64 tx_bytes;
u64 tx_drops;
u64 tx_errors;
};
struct vxlan_vni_stats_pcpu {
struct vxlan_vni_stats stats;
struct u64_stats_sync syncp;
};
struct vxlan_dev_node {
struct hlist_node hlist;
struct vxlan_dev *vxlan;
};
struct vxlan_vni_node {
struct rhash_head vnode;
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 vlist;
__be32 vni;
union vxlan_addr remote_ip; /* default remote ip for this vni */
struct vxlan_vni_stats_pcpu __percpu *stats;
struct rcu_head rcu;
};
struct vxlan_vni_group {
struct rhashtable vni_hash;
struct list_head vni_list;
u32 num_vnis;
};
/* 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 vxlan_vni_group __rcu *vnigrp;
struct hlist_head fdb_head[FDB_HASH_SIZE];
struct rhashtable mdb_tbl;
struct hlist_head mdb_list;
unsigned int mdb_seq;
};
#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
#define VXLAN_F_VNIFILTER 0x20000
#define VXLAN_F_MDB 0x40000
#define VXLAN_F_LOCALBYPASS 0x80000
/* 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 | \
VXLAN_F_VNIFILTER)
/* 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 | \
VXLAN_F_VNIFILTER | \
VXLAN_F_LOCALBYPASS)
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;
}
/* 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;
}
#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,
int hash,
struct vxlan_rdst *rdst)
{
struct fib_nh_common *nhc;
nhc = nexthop_path_fdb_result(nh, hash);
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;
}
static inline void vxlan_build_gbp_hdr(struct vxlanhdr *vxh, const struct vxlan_metadata *md)
{
struct vxlanhdr_gbp *gbp;
if (!md->gbp)
return;
gbp = (struct vxlanhdr_gbp *)vxh;
vxh->vx_flags |= VXLAN_HF_GBP;
if (md->gbp & VXLAN_GBP_DONT_LEARN)
gbp->dont_learn = 1;
if (md->gbp & VXLAN_GBP_POLICY_APPLIED)
gbp->policy_applied = 1;
gbp->policy_id = htons(md->gbp & VXLAN_GBP_ID_MASK);
}
#endif
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