flow_dissector.h | Explore in Territory

/* 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>
#include <uapi/linux/pkt_cls.h>

struct bpf_prog;
struct net;
struct sk_buff;

/**
 * struct flow_dissector_key_control:
 * @thoff:     Transport header offset
 * @addr_type: Type of key. One of FLOW_DISSECTOR_KEY_*
 * @flags:     Key flags.
 *             Any of FLOW_DIS_(IS_FRAGMENT|FIRST_FRAG|ENCAPSULATION|F_*)
 */
struct flow_dissector_key_control { … };

/* The control flags are kept in sync with TCA_FLOWER_KEY_FLAGS_*, as those
 * flags are exposed to userspace in some error paths, ie. unsupported flags.
 */
enum flow_dissector_ctrl_flags { … };

enum flow_dissect_ret { … };

/**
 * struct flow_dissector_key_basic:
 * @n_proto:  Network header protocol (eg. IPv4/IPv6)
 * @ip_proto: Transport header protocol (eg. TCP/UDP)
 * @padding:  Unused
 */
struct flow_dissector_key_basic { … };

struct flow_dissector_key_tags { … };

struct flow_dissector_key_vlan { … };

struct flow_dissector_mpls_lse { … };

#define FLOW_DIS_MPLS_MAX …
struct flow_dissector_key_mpls { … };

static inline void dissector_set_mpls_lse(struct flow_dissector_key_mpls *mpls,
					  int lse_index)
{ … }

#define FLOW_DIS_TUN_OPTS_MAX …
/**
 * 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 { … };

struct flow_dissector_key_keyid { … };

/**
 * struct flow_dissector_key_ipv4_addrs:
 * @src: source ip address
 * @dst: destination ip address
 */
struct flow_dissector_key_ipv4_addrs { … };

/**
 * struct flow_dissector_key_ipv6_addrs:
 * @src: source ip address
 * @dst: destination ip address
 */
struct flow_dissector_key_ipv6_addrs { … };

/**
 * struct flow_dissector_key_tipc:
 * @key: source node address combined with selector
 */
struct flow_dissector_key_tipc { … };

/**
 * struct flow_dissector_key_addrs:
 * @v4addrs: IPv4 addresses
 * @v6addrs: IPv6 addresses
 * @tipckey: TIPC key
 */
struct flow_dissector_key_addrs { … };

/**
 * struct flow_dissector_key_arp:
 * @sip: Sender IP address
 * @tip: Target IP address
 * @op:  Operation
 * @sha: Sender hardware address
 * @tha: Target hardware address
 */
struct flow_dissector_key_arp { … };

/**
 * struct flow_dissector_key_ports:
 * @ports: port numbers of Transport header
 * @src: source port number
 * @dst: destination port number
 */
struct flow_dissector_key_ports { … };

/**
 * struct flow_dissector_key_ports_range
 * @tp: port number from packet
 * @tp_min: min port number in range
 * @tp_max: max port number in range
 */
struct flow_dissector_key_ports_range { … };

/**
 * struct flow_dissector_key_icmp:
 * @type: ICMP type
 * @code: ICMP code
 * @id:   Session identifier
 */
struct flow_dissector_key_icmp { … };

/**
 * struct flow_dissector_key_eth_addrs:
 * @src: source Ethernet address
 * @dst: destination Ethernet address
 */
struct flow_dissector_key_eth_addrs { … };

/**
 * struct flow_dissector_key_tcp:
 * @flags: flags
 */
struct flow_dissector_key_tcp { … };

/**
 * struct flow_dissector_key_ip:
 * @tos: tos
 * @ttl: ttl
 */
struct flow_dissector_key_ip { … };

/**
 * struct flow_dissector_key_meta:
 * @ingress_ifindex: ingress ifindex
 * @ingress_iftype: ingress interface type
 * @l2_miss: packet did not match an L2 entry during forwarding
 */
struct flow_dissector_key_meta { … };

/**
 * 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 { … };

/**
 * struct flow_dissector_key_hash:
 * @hash: hash value
 */
struct flow_dissector_key_hash { … };

/**
 * struct flow_dissector_key_num_of_vlans:
 * @num_of_vlans: num_of_vlans value
 */
struct flow_dissector_key_num_of_vlans { … };

/**
 * struct flow_dissector_key_pppoe:
 * @session_id: pppoe session id
 * @ppp_proto: ppp protocol
 * @type: pppoe eth type
 */
struct flow_dissector_key_pppoe { … };

/**
 * struct flow_dissector_key_l2tpv3:
 * @session_id: identifier for a l2tp session
 */
struct flow_dissector_key_l2tpv3 { … };

/**
 * struct flow_dissector_key_ipsec:
 * @spi: identifier for a ipsec connection
 */
struct flow_dissector_key_ipsec { … };

/**
 * struct flow_dissector_key_cfm
 * @mdl_ver: maintenance domain level (mdl) and cfm protocol version
 * @opcode: code specifying a type of cfm protocol packet
 *
 * See 802.1ag, ITU-T G.8013/Y.1731
 *         1               2
 * |7 6 5 4 3 2 1 0|7 6 5 4 3 2 1 0|
 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 * | mdl | version |     opcode    |
 * +-----+---------+-+-+-+-+-+-+-+-+
 */
struct flow_dissector_key_cfm { … };

#define FLOW_DIS_CFM_MDL_MASK …
#define FLOW_DIS_CFM_MDL_MAX …

enum flow_dissector_key_id { … };

#define FLOW_DISSECTOR_F_PARSE_1ST_FRAG …
#define FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL …
#define FLOW_DISSECTOR_F_STOP_AT_ENCAP …
#define FLOW_DISSECTOR_F_STOP_BEFORE_ENCAP …

struct flow_dissector_key { … };

struct flow_dissector { … };

struct flow_keys_basic { … };

struct flow_keys { … };

#define FLOW_KEYS_HASH_OFFSET …

__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 …
struct flow_keys_digest { … };

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)
{ … }

u32 flow_hash_from_keys(struct flow_keys *keys);
u32 flow_hash_from_keys_seed(struct flow_keys *keys,
			     const siphash_key_t *keyval);
void skb_flow_get_icmp_tci(const struct sk_buff *skb,
			   struct flow_dissector_key_icmp *key_icmp,
			   const 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)
{ … }

static inline void *skb_flow_dissector_target(struct flow_dissector *flow_dissector,
					      enum flow_dissector_key_id key_id,
					      void *target_container)
{ … }

struct bpf_flow_dissector { … };

static inline void
flow_dissector_init_keys(struct flow_dissector_key_control *key_control,
			 struct flow_dissector_key_basic *key_basic)
{ … }

#ifdef CONFIG_BPF_SYSCALL
int flow_dissector_bpf_prog_attach_check(struct net *net,
					 struct bpf_prog *prog);
#endif /* CONFIG_BPF_SYSCALL */

#endif
linux/include/net/flow_dissector.h
