/* SPDX-License-Identifier: GPL-2.0 */#ifndef _NET_FLOW_DISSECTOR_H#define _NET_FLOW_DISSECTOR_H #include <linux/types.h>#include <linux/in6.h>#include <linux/siphash.h>#include <linux/string.h>#include <uapi/linux/if_ether.h> struct bpf_prog;struct net;struct sk_buff; /** * struct flow_dissector_key_control: * @thoff: Transport header offset */struct flow_dissector_key_control {	u16	thoff;	u16	addr_type;	u32	flags;}; #define FLOW_DIS_IS_FRAGMENT	BIT(0)#define FLOW_DIS_FIRST_FRAG	BIT(1)#define FLOW_DIS_ENCAPSULATION	BIT(2) enum flow_dissect_ret {	FLOW_DISSECT_RET_OUT_GOOD,	FLOW_DISSECT_RET_OUT_BAD,	FLOW_DISSECT_RET_PROTO_AGAIN,	FLOW_DISSECT_RET_IPPROTO_AGAIN,	FLOW_DISSECT_RET_CONTINUE,}; /** * struct flow_dissector_key_basic: * @n_proto: Network header protocol (eg. IPv4/IPv6) * @ip_proto: Transport header protocol (eg. TCP/UDP) */struct flow_dissector_key_basic {	__be16	n_proto;	u8	ip_proto;	u8	padding;}; struct flow_dissector_key_tags {	u32	flow_label;}; struct flow_dissector_key_vlan {	union {		struct {			u16	vlan_id:12,				vlan_dei:1,				vlan_priority:3;		};		__be16	vlan_tci;	};	__be16	vlan_tpid;}; struct flow_dissector_mpls_lse {	u32	mpls_ttl:8,		mpls_bos:1,		mpls_tc:3,		mpls_label:20;}; #define FLOW_DIS_MPLS_MAX 7struct flow_dissector_key_mpls {	struct flow_dissector_mpls_lse ls[FLOW_DIS_MPLS_MAX]; /* Label Stack */	u8 used_lses; /* One bit set for each Label Stack Entry in use */}; static inline void dissector_set_mpls_lse(struct flow_dissector_key_mpls *mpls,					  int lse_index){	mpls->used_lses |= 1 << lse_index;} #define FLOW_DIS_TUN_OPTS_MAX 255/** * struct flow_dissector_key_enc_opts: * @data: tunnel option data * @len: length of tunnel option data * @dst_opt_type: tunnel option type */struct flow_dissector_key_enc_opts {	u8 data[FLOW_DIS_TUN_OPTS_MAX];	/* Using IP_TUNNEL_OPTS_MAX is desired					 * here but seems difficult to #include					 */	u8 len;	__be16 dst_opt_type;}; struct flow_dissector_key_keyid {	__be32	keyid;}; /** * struct flow_dissector_key_ipv4_addrs: * @src: source ip address * @dst: destination ip address */struct flow_dissector_key_ipv4_addrs {	/* (src,dst) must be grouped, in the same way than in IP header */	__be32 src;	__be32 dst;}; /** * struct flow_dissector_key_ipv6_addrs: * @src: source ip address * @dst: destination ip address */struct flow_dissector_key_ipv6_addrs {	/* (src,dst) must be grouped, in the same way than in IP header */	struct in6_addr src;	struct in6_addr dst;}; /** * struct flow_dissector_key_tipc: * @key: source node address combined with selector */struct flow_dissector_key_tipc {	__be32 key;}; /** * struct flow_dissector_key_addrs: * @v4addrs: IPv4 addresses * @v6addrs: IPv6 addresses */struct flow_dissector_key_addrs {	union {		struct flow_dissector_key_ipv4_addrs v4addrs;		struct flow_dissector_key_ipv6_addrs v6addrs;		struct flow_dissector_key_tipc tipckey;	};}; /** * flow_dissector_key_arp: *	@ports: Operation, source and target addresses for an ARP header *              for Ethernet hardware addresses and IPv4 protocol addresses *		sip: Sender IP address *		tip: Target IP address *		op:  Operation *		sha: Sender hardware address *		tpa: Target hardware address */struct flow_dissector_key_arp {	__u32 sip;	__u32 tip;	__u8 op;	unsigned char sha[ETH_ALEN];	unsigned char tha[ETH_ALEN];}; /** * flow_dissector_key_tp_ports: *	@ports: port numbers of Transport header *		src: source port number *		dst: destination port number */struct flow_dissector_key_ports {	union {		__be32 ports;		struct {			__be16 src;			__be16 dst;		};	};}; /** * flow_dissector_key_icmp: *		type: ICMP type *		code: ICMP code *		id:   session identifier */struct flow_dissector_key_icmp {	struct {		u8 type;		u8 code;	};	u16 id;}; /** * struct flow_dissector_key_eth_addrs: * @src: source Ethernet address * @dst: destination Ethernet address */struct flow_dissector_key_eth_addrs {	/* (dst,src) must be grouped, in the same way than in ETH header */	unsigned char dst[ETH_ALEN];	unsigned char src[ETH_ALEN];}; /** * struct flow_dissector_key_tcp: * @flags: flags */struct flow_dissector_key_tcp {	__be16 flags;}; /** * struct flow_dissector_key_ip: * @tos: tos * @ttl: ttl */struct flow_dissector_key_ip {	__u8	tos;	__u8	ttl;}; /** * struct flow_dissector_key_meta: * @ingress_ifindex: ingress ifindex * @ingress_iftype: ingress interface type */struct flow_dissector_key_meta {	int ingress_ifindex;	u16 ingress_iftype;}; /** * struct flow_dissector_key_ct: * @ct_state: conntrack state after converting with map * @ct_mark: conttrack mark * @ct_zone: conntrack zone * @ct_labels: conntrack labels */struct flow_dissector_key_ct {	u16	ct_state;	u16	ct_zone;	u32	ct_mark;	u32	ct_labels[4];}; /** * struct flow_dissector_key_hash: * @hash: hash value */struct flow_dissector_key_hash {	u32 hash;}; enum flow_dissector_key_id {	FLOW_DISSECTOR_KEY_CONTROL, /* struct flow_dissector_key_control */	FLOW_DISSECTOR_KEY_BASIC, /* struct flow_dissector_key_basic */	FLOW_DISSECTOR_KEY_IPV4_ADDRS, /* struct flow_dissector_key_ipv4_addrs */	FLOW_DISSECTOR_KEY_IPV6_ADDRS, /* struct flow_dissector_key_ipv6_addrs */	FLOW_DISSECTOR_KEY_PORTS, /* struct flow_dissector_key_ports */	FLOW_DISSECTOR_KEY_PORTS_RANGE, /* struct flow_dissector_key_ports */	FLOW_DISSECTOR_KEY_ICMP, /* struct flow_dissector_key_icmp */	FLOW_DISSECTOR_KEY_ETH_ADDRS, /* struct flow_dissector_key_eth_addrs */	FLOW_DISSECTOR_KEY_TIPC, /* struct flow_dissector_key_tipc */	FLOW_DISSECTOR_KEY_ARP, /* struct flow_dissector_key_arp */	FLOW_DISSECTOR_KEY_VLAN, /* struct flow_dissector_key_vlan */	FLOW_DISSECTOR_KEY_FLOW_LABEL, /* struct flow_dissector_key_tags */	FLOW_DISSECTOR_KEY_GRE_KEYID, /* struct flow_dissector_key_keyid */	FLOW_DISSECTOR_KEY_MPLS_ENTROPY, /* struct flow_dissector_key_keyid */	FLOW_DISSECTOR_KEY_ENC_KEYID, /* struct flow_dissector_key_keyid */	FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS, /* struct flow_dissector_key_ipv4_addrs */	FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS, /* struct flow_dissector_key_ipv6_addrs */	FLOW_DISSECTOR_KEY_ENC_CONTROL, /* struct flow_dissector_key_control */	FLOW_DISSECTOR_KEY_ENC_PORTS, /* struct flow_dissector_key_ports */	FLOW_DISSECTOR_KEY_MPLS, /* struct flow_dissector_key_mpls */	FLOW_DISSECTOR_KEY_TCP, /* struct flow_dissector_key_tcp */	FLOW_DISSECTOR_KEY_IP, /* struct flow_dissector_key_ip */	FLOW_DISSECTOR_KEY_CVLAN, /* struct flow_dissector_key_vlan */	FLOW_DISSECTOR_KEY_ENC_IP, /* struct flow_dissector_key_ip */	FLOW_DISSECTOR_KEY_ENC_OPTS, /* struct flow_dissector_key_enc_opts */	FLOW_DISSECTOR_KEY_META, /* struct flow_dissector_key_meta */	FLOW_DISSECTOR_KEY_CT, /* struct flow_dissector_key_ct */	FLOW_DISSECTOR_KEY_HASH, /* struct flow_dissector_key_hash */ 	FLOW_DISSECTOR_KEY_MAX,}; #define FLOW_DISSECTOR_F_PARSE_1ST_FRAG		BIT(0)#define FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL	BIT(1)#define FLOW_DISSECTOR_F_STOP_AT_ENCAP		BIT(2) struct flow_dissector_key {	enum flow_dissector_key_id key_id;	size_t offset; /* offset of struct flow_dissector_key_*			  in target the struct */}; struct flow_dissector {	unsigned int used_keys; /* each bit repesents presence of one key id */	unsigned short int offset[FLOW_DISSECTOR_KEY_MAX];}; struct flow_keys_basic {	struct flow_dissector_key_control control;	struct flow_dissector_key_basic basic;}; struct flow_keys {	struct flow_dissector_key_control control;#define FLOW_KEYS_HASH_START_FIELD basic	struct flow_dissector_key_basic basic __aligned(SIPHASH_ALIGNMENT);	struct flow_dissector_key_tags tags;	struct flow_dissector_key_vlan vlan;	struct flow_dissector_key_vlan cvlan;	struct flow_dissector_key_keyid keyid;	struct flow_dissector_key_ports ports;	struct flow_dissector_key_icmp icmp;	/* 'addrs' must be the last member */	struct flow_dissector_key_addrs addrs;}; #define FLOW_KEYS_HASH_OFFSET		\	offsetof(struct flow_keys, FLOW_KEYS_HASH_START_FIELD) __be32 flow_get_u32_src(const struct flow_keys *flow);__be32 flow_get_u32_dst(const struct flow_keys *flow); extern struct flow_dissector flow_keys_dissector;extern struct flow_dissector flow_keys_basic_dissector; /* struct flow_keys_digest: * * This structure is used to hold a digest of the full flow keys. This is a * larger "hash" of a flow to allow definitively matching specific flows where * the 32 bit skb->hash is not large enough. The size is limited to 16 bytes so * that it can be used in CB of skb (see sch_choke for an example). */#define FLOW_KEYS_DIGEST_LEN	16struct flow_keys_digest {	u8	data[FLOW_KEYS_DIGEST_LEN];}; void make_flow_keys_digest(struct flow_keys_digest *digest,			   const struct flow_keys *flow); static inline bool flow_keys_have_l4(const struct flow_keys *keys){	return (keys->ports.ports || keys->tags.flow_label);} u32 flow_hash_from_keys(struct flow_keys *keys);void skb_flow_get_icmp_tci(const struct sk_buff *skb,			   struct flow_dissector_key_icmp *key_icmp,			   void *data, int thoff, int hlen); static inline bool dissector_uses_key(const struct flow_dissector *flow_dissector,				      enum flow_dissector_key_id key_id){	return flow_dissector->used_keys & (1 << key_id);} static inline void *skb_flow_dissector_target(struct flow_dissector *flow_dissector,					      enum flow_dissector_key_id key_id,					      void *target_container){	return ((char *)target_container) + flow_dissector->offset[key_id];} struct bpf_flow_dissector {	struct bpf_flow_keys	*flow_keys;	const struct sk_buff	*skb;	void			*data;	void			*data_end;}; static inline voidflow_dissector_init_keys(struct flow_dissector_key_control *key_control,			 struct flow_dissector_key_basic *key_basic){	memset(key_control, 0, sizeof(*key_control));	memset(key_basic, 0, sizeof(*key_basic));} #ifdef CONFIG_BPF_SYSCALLint flow_dissector_bpf_prog_attach_check(struct net *net,					 struct bpf_prog *prog);#endif /* CONFIG_BPF_SYSCALL */ #endif