qemu/net/colo.h
Zhang Chen 3772cf0d1b net/colo.c: Fix the pointer issue reported by Coverity.
When enabled the virtio-net-pci, guest network packet will
load the vnet_hdr. In COLO status, the primary VM's network
packet maybe redirect to another VM, it needs filter-redirect
enable the vnet_hdr flag at the same time, COLO-proxy will
correctly parse the original network packet. If have any
misconfiguration here, the vnet_hdr_len is wrong for parse
the packet, the data+offset will point to wrong place.

Signed-off-by: Zhang Chen <chen.zhang@intel.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
2022-09-02 10:22:39 +08:00

110 lines
3.5 KiB
C

/*
* COarse-grain LOck-stepping Virtual Machines for Non-stop Service (COLO)
* (a.k.a. Fault Tolerance or Continuous Replication)
*
* Copyright (c) 2016 HUAWEI TECHNOLOGIES CO., LTD.
* Copyright (c) 2016 FUJITSU LIMITED
* Copyright (c) 2016 Intel Corporation
*
* Author: Zhang Chen <zhangchen.fnst@cn.fujitsu.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or
* later. See the COPYING file in the top-level directory.
*/
#ifndef NET_COLO_H
#define NET_COLO_H
#include "qemu/jhash.h"
#include "qemu/timer.h"
#include "net/eth.h"
#include "standard-headers/linux/virtio_net.h"
#define HASHTABLE_MAX_SIZE 16384
#ifndef IPPROTO_DCCP
#define IPPROTO_DCCP 33
#endif
#ifndef IPPROTO_SCTP
#define IPPROTO_SCTP 132
#endif
#ifndef IPPROTO_UDPLITE
#define IPPROTO_UDPLITE 136
#endif
typedef struct Packet {
void *data;
union {
uint8_t *network_header;
struct ip *ip;
};
uint8_t *transport_header;
int size;
/* Time of packet creation, in wall clock ms */
int64_t creation_ms;
/* Get vnet_hdr_len from filter */
uint32_t vnet_hdr_len;
uint32_t tcp_seq; /* sequence number */
uint32_t tcp_ack; /* acknowledgement number */
/* the sequence number of the last byte of the packet */
uint32_t seq_end;
uint8_t header_size; /* the header length */
uint16_t payload_size; /* the payload length */
/* record the payload offset(the length that has been compared) */
uint16_t offset;
uint8_t flags; /* Flags(aka Control bits) */
} Packet;
typedef struct ConnectionKey {
/* (src, dst) must be grouped, in the same way than in IP header */
struct in_addr src;
struct in_addr dst;
uint16_t src_port;
uint16_t dst_port;
uint8_t ip_proto;
} QEMU_PACKED ConnectionKey;
typedef struct Connection {
/* connection primary send queue: element type: Packet */
GQueue primary_list;
/* connection secondary send queue: element type: Packet */
GQueue secondary_list;
/* flag to enqueue unprocessed_connections */
bool processing;
uint8_t ip_proto;
/* record the sequence number that has been compared */
uint32_t compare_seq;
/* the maximum of acknowledgement number in primary_list queue */
uint32_t pack;
/* the maximum of acknowledgement number in secondary_list queue */
uint32_t sack;
/* offset = secondary_seq - primary_seq */
uint32_t offset;
int tcp_state; /* TCP FSM state */
uint32_t fin_ack_seq; /* the seq of 'fin=1,ack=1' */
} Connection;
uint32_t connection_key_hash(const void *opaque);
int connection_key_equal(const void *opaque1, const void *opaque2);
int parse_packet_early(Packet *pkt);
void extract_ip_and_port(uint32_t tmp_ports, ConnectionKey *key,
Packet *pkt, bool reverse);
void fill_connection_key(Packet *pkt, ConnectionKey *key, bool reverse);
Connection *connection_new(ConnectionKey *key);
void connection_destroy(void *opaque);
Connection *connection_get(GHashTable *connection_track_table,
ConnectionKey *key,
GQueue *conn_list);
bool connection_has_tracked(GHashTable *connection_track_table,
ConnectionKey *key);
void connection_hashtable_reset(GHashTable *connection_track_table);
Packet *packet_new(const void *data, int size, int vnet_hdr_len);
Packet *packet_new_nocopy(void *data, int size, int vnet_hdr_len);
void packet_destroy(void *opaque, void *user_data);
void packet_destroy_partial(void *opaque, void *user_data);
#endif /* NET_COLO_H */