248 строки
6.5 KiB
C
248 строки
6.5 KiB
C
#ifndef _NET_FLOW_DISSECTOR_H
|
|
#define _NET_FLOW_DISSECTOR_H
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/in6.h>
|
|
#include <uapi/linux/if_ether.h>
|
|
|
|
/**
|
|
* 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)
|
|
|
|
/**
|
|
* struct flow_dissector_key_basic:
|
|
* @thoff: Transport header offset
|
|
* @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 {
|
|
u16 vlan_id:12,
|
|
vlan_priority:3;
|
|
u16 padding;
|
|
};
|
|
|
|
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_addrs:
|
|
* @srcnode: source node address
|
|
*/
|
|
struct flow_dissector_key_tipc_addrs {
|
|
__be32 srcnode;
|
|
};
|
|
|
|
/**
|
|
* 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_addrs tipcaddrs;
|
|
};
|
|
};
|
|
|
|
/**
|
|
* 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:
|
|
* @ports: type and code of ICMP header
|
|
* icmp: ICMP type (high) and code (low)
|
|
* type: ICMP type
|
|
* code: ICMP code
|
|
*/
|
|
struct flow_dissector_key_icmp {
|
|
union {
|
|
__be16 icmp;
|
|
struct {
|
|
u8 type;
|
|
u8 code;
|
|
};
|
|
};
|
|
};
|
|
|
|
/**
|
|
* 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];
|
|
};
|
|
|
|
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_ICMP, /* struct flow_dissector_key_icmp */
|
|
FLOW_DISSECTOR_KEY_ETH_ADDRS, /* struct flow_dissector_key_eth_addrs */
|
|
FLOW_DISSECTOR_KEY_TIPC_ADDRS, /* struct flow_dissector_key_tipc_addrs */
|
|
FLOW_DISSECTOR_KEY_ARP, /* struct flow_dissector_key_arp */
|
|
FLOW_DISSECTOR_KEY_VLAN, /* struct flow_dissector_key_flow_vlan */
|
|
FLOW_DISSECTOR_KEY_FLOW_LABEL, /* struct flow_dissector_key_flow_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_MAX,
|
|
};
|
|
|
|
#define FLOW_DISSECTOR_F_PARSE_1ST_FRAG BIT(0)
|
|
#define FLOW_DISSECTOR_F_STOP_AT_L3 BIT(1)
|
|
#define FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL BIT(2)
|
|
#define FLOW_DISSECTOR_F_STOP_AT_ENCAP BIT(3)
|
|
|
|
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 {
|
|
struct flow_dissector_key_control control;
|
|
#define FLOW_KEYS_HASH_START_FIELD basic
|
|
struct flow_dissector_key_basic basic;
|
|
struct flow_dissector_key_tags tags;
|
|
struct flow_dissector_key_vlan vlan;
|
|
struct flow_dissector_key_keyid keyid;
|
|
struct flow_dissector_key_ports ports;
|
|
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_buf_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 by 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);
|
|
|
|
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];
|
|
}
|
|
|
|
#endif
|