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258 lines
7.0 KiB
258 lines
7.0 KiB
#ifndef __NET_VXLAN_H |
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#define __NET_VXLAN_H 1 |
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#include <linux/ip.h> |
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#include <linux/ipv6.h> |
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#include <linux/if_vlan.h> |
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#include <linux/skbuff.h> |
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#include <linux/netdevice.h> |
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#include <linux/udp.h> |
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#include <net/dst_metadata.h> |
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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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/* |
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* VXLAN Group Based Policy Extension: |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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* |1|-|-|-|1|-|-|-|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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* 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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* [0] 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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#define VXLAN_GBP_USED_BITS (VXLAN_HF_GBP | 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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/* VXLAN protocol header: |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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* |G|R|R|R|I|R|R|C| 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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* G = 1 Group Policy (VXLAN-GBP) |
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* I = 1 VXLAN Network Identifier (VNI) present |
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* C = 1 Remote checksum offload (RCO) |
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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_RCO BIT(21) |
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#define VXLAN_HF_VNI BIT(27) |
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#define VXLAN_HF_GBP BIT(31) |
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/* Remote checksum offload header option */ |
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#define VXLAN_RCO_MASK 0x7f /* Last byte of vni field */ |
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#define VXLAN_RCO_UDP 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 (VXLAN_RCO_MASK << VXLAN_RCO_SHIFT) |
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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 (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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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 work_struct del_work; |
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struct socket *sock; |
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struct rcu_head rcu; |
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struct hlist_head vni_list[VNI_HASH_SIZE]; |
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atomic_t refcnt; |
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struct udp_offload udp_offloads; |
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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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u32 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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}; |
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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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u32 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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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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/* Pseudo network device */ |
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struct vxlan_dev { |
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struct hlist_node hlist; /* vni hash table */ |
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struct list_head next; /* vxlan's per namespace list */ |
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struct vxlan_sock *vn4_sock; /* listening socket for IPv4 */ |
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#if IS_ENABLED(CONFIG_IPV6) |
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struct vxlan_sock *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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u32 flags; /* VXLAN_F_* in vxlan.h */ |
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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_CSUM 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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/* 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_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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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 __be16 vxlan_dev_dst_port(struct vxlan_dev *vxlan, |
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unsigned short family) |
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{ |
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#if IS_ENABLED(CONFIG_IPV6) |
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if (family == AF_INET6) |
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return inet_sk(vxlan->vn6_sock->sock->sk)->inet_sport; |
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#endif |
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return inet_sk(vxlan->vn4_sock->sock->sk)->inet_sport; |
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} |
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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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return features & ~(NETIF_F_ALL_CSUM | 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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#if IS_ENABLED(CONFIG_VXLAN) |
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void vxlan_get_rx_port(struct net_device *netdev); |
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#else |
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static inline void vxlan_get_rx_port(struct net_device *netdev) |
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{ |
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} |
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#endif |
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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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