389 строки
9.9 KiB
C
389 строки
9.9 KiB
C
/* 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 7
|
|
struct 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 16
|
|
struct 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 void
|
|
flow_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_SYSCALL
|
|
int flow_dissector_bpf_prog_attach_check(struct net *net,
|
|
struct bpf_prog *prog);
|
|
#endif /* CONFIG_BPF_SYSCALL */
|
|
|
|
#endif
|