cregit-Linux how code gets into the kernel

Release 4.12 include/net/vxlan.h

Directory: include/net
#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;
};

/* Pseudo network device */

struct vxlan_dev {
	
struct hlist_node hlist;	/* vni hash table */
	
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 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; }

Contributors

PersonTokensPropCommitsCommitProp
Jesse Gross7446.54%120.00%
Joe Stringer6339.62%240.00%
Alexander Duyck2113.21%120.00%
Tom Herbert10.63%120.00%
Total159100.00%5100.00%

/* 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); }

Contributors

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Jiri Benc29100.00%1100.00%
Total29100.00%1100.00%


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 }

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Jiri Benc54100.00%2100.00%
Total54100.00%2100.00%


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 }

Contributors

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Jiri Benc50100.00%2100.00%
Total50100.00%2100.00%


static inline size_t vxlan_rco_start(__be32 vni_field) { return be32_to_cpu(vni_field & VXLAN_RCO_MASK) << VXLAN_RCO_SHIFT; }

Contributors

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Jiri Benc20100.00%1100.00%
Total20100.00%1100.00%


static inline size_t vxlan_rco_offset(__be32 vni_field) { return (vni_field & VXLAN_RCO_UDP) ? offsetof(struct udphdr, check) : offsetof(struct tcphdr, check); }

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Jiri Benc33100.00%1100.00%
Total33100.00%1100.00%


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; }

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Jiri Benc44100.00%1100.00%
Total44100.00%1100.00%


static inline unsigned short vxlan_get_sk_family(struct vxlan_sock *vs) { return vs->sock->sk->sk_family; }

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Jiri Benc22100.00%1100.00%
Total22100.00%1100.00%

#endif

Overall Contributors

PersonTokensPropCommitsCommitProp
Jiri Benc52249.86%927.27%
Thomas Graf22121.11%412.12%
Tom Herbert837.93%721.21%
Jesse Gross777.35%13.03%
Joe Stringer636.02%26.06%
Pravin B Shelar353.34%13.03%
Alexander Duyck262.48%412.12%
Joseph Gasparakis100.96%13.03%
Paolo Abeni40.38%13.03%
Daniel Borkmann30.29%13.03%
pravin shelar20.19%13.03%
Simon Horman10.10%13.03%
Total1047100.00%33100.00%
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