File: [Development] / linux-2.4-xfs / include / net / ip_vs.h (download)
Revision 1.5, Wed Dec 21 14:32:30 2005 UTC (11 years, 9 months ago) by nathans.longdrop.melbourne.sgi.com
Branch: MAIN
CVS Tags: HEAD
Changes since 1.4: +3 -0
lines
Merge up to 2.4.32.
Merge of 2.4.x-xfs-melb:linux:24898a by kenmcd.
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/*
* IP Virtual Server
* data structure and functionality definitions
*/
#ifndef _IP_VS_H
#define _IP_VS_H
#include <asm/types.h> /* For __uXX types */
#define IP_VS_VERSION_CODE 0x01000C
#define NVERSION(version) \
(version >> 16) & 0xFF, \
(version >> 8) & 0xFF, \
version & 0xFF
/*
* Virtual Service Flags
*/
#define IP_VS_SVC_F_PERSISTENT 0x0001 /* persistent port */
#define IP_VS_SVC_F_HASHED 0x0002 /* hashed entry */
/*
* Destination Server Flags
*/
#define IP_VS_DEST_F_AVAILABLE 0x0001 /* Available tag */
/*
* IPVS sync daemon states
*/
#define IP_VS_STATE_NONE 0 /* daemon is stopped */
#define IP_VS_STATE_MASTER 1 /* started as master */
#define IP_VS_STATE_BACKUP 2 /* started as backup */
/*
* IPVS socket options
*/
#define IP_VS_BASE_CTL (64+1024+64) /* base */
#define IP_VS_SO_SET_NONE IP_VS_BASE_CTL /* just peek */
#define IP_VS_SO_SET_INSERT (IP_VS_BASE_CTL+1)
#define IP_VS_SO_SET_ADD (IP_VS_BASE_CTL+2)
#define IP_VS_SO_SET_EDIT (IP_VS_BASE_CTL+3)
#define IP_VS_SO_SET_DEL (IP_VS_BASE_CTL+4)
#define IP_VS_SO_SET_FLUSH (IP_VS_BASE_CTL+5)
#define IP_VS_SO_SET_LIST (IP_VS_BASE_CTL+6)
#define IP_VS_SO_SET_ADDDEST (IP_VS_BASE_CTL+7)
#define IP_VS_SO_SET_DELDEST (IP_VS_BASE_CTL+8)
#define IP_VS_SO_SET_EDITDEST (IP_VS_BASE_CTL+9)
#define IP_VS_SO_SET_TIMEOUTS (IP_VS_BASE_CTL+10)
#define IP_VS_SO_SET_STARTDAEMON (IP_VS_BASE_CTL+11)
#define IP_VS_SO_SET_STOPDAEMON (IP_VS_BASE_CTL+12)
#define IP_VS_SO_SET_RESTORE (IP_VS_BASE_CTL+13)
#define IP_VS_SO_SET_SAVE (IP_VS_BASE_CTL+14)
#define IP_VS_SO_SET_ZERO (IP_VS_BASE_CTL+15)
#define IP_VS_SO_SET_MAX IP_VS_SO_SET_ZERO
#define IP_VS_SO_GET_VERSION IP_VS_BASE_CTL
#define IP_VS_SO_GET_INFO (IP_VS_BASE_CTL+1)
#define IP_VS_SO_GET_SERVICES (IP_VS_BASE_CTL+2)
#define IP_VS_SO_GET_SERVICE (IP_VS_BASE_CTL+3)
#define IP_VS_SO_GET_DESTS (IP_VS_BASE_CTL+4)
#define IP_VS_SO_GET_DEST (IP_VS_BASE_CTL+5) /* not used now */
#define IP_VS_SO_GET_TIMEOUTS (IP_VS_BASE_CTL+6)
#define IP_VS_SO_GET_DAEMON (IP_VS_BASE_CTL+7)
#define IP_VS_SO_GET_MAX IP_VS_SO_GET_DAEMON
/*
* IPVS Connection Flags
*/
#define IP_VS_CONN_F_FWD_MASK 0x0007 /* mask for the fwd methods */
#define IP_VS_CONN_F_MASQ 0x0000 /* masquerading */
#define IP_VS_CONN_F_LOCALNODE 0x0001 /* local node */
#define IP_VS_CONN_F_TUNNEL 0x0002 /* tunneling */
#define IP_VS_CONN_F_DROUTE 0x0003 /* direct routing */
#define IP_VS_CONN_F_BYPASS 0x0004 /* cache bypass */
#define IP_VS_CONN_F_HASHED 0x0040 /* hashed entry */
#define IP_VS_CONN_F_NOOUTPUT 0x0080 /* no output packets */
#define IP_VS_CONN_F_INACTIVE 0x0100 /* not established */
#define IP_VS_CONN_F_OUT_SEQ 0x0200 /* must do output seq adjust */
#define IP_VS_CONN_F_IN_SEQ 0x0400 /* must do input seq adjust */
#define IP_VS_CONN_F_SEQ_MASK 0x0600 /* in/out sequence mask */
#define IP_VS_CONN_F_NO_CPORT 0x0800 /* no client port set yet */
#define IP_VS_CONN_F_TEMPLATE 0x1000 /* template, not connection */
/* Move it to better place one day, for now keep it unique */
#define NFC_IPVS_PROPERTY 0x10000
#define IP_VS_SCHEDNAME_MAXLEN 16
#define IP_VS_IFNAME_MAXLEN 16
struct ip_vs_rule_user {
/* global options */
int tcp_timeout; /* timeout values */
int tcp_fin_timeout;
int udp_timeout;
int state; /* sync daemon state */
char mcast_ifn[IP_VS_IFNAME_MAXLEN];
/* multicast interface name */
int syncid;
/* virtual service options */
u_int16_t protocol;
u_int32_t vaddr; /* virtual address */
u_int16_t vport;
u_int32_t vfwmark; /* firwall mark of virtual service*/
char sched_name[IP_VS_SCHEDNAME_MAXLEN];
unsigned vs_flags; /* virtual service flags */
unsigned timeout; /* persistent timeout in ticks */
u_int32_t netmask; /* persistent netmask */
/* destination specific options */
u_int32_t daddr; /* destination address */
u_int16_t dport;
unsigned conn_flags; /* destination flags */
int weight; /* destination weight */
};
/*
* IPVS statistics object (for user space)
*/
struct ip_vs_stats_user
{
__u32 conns; /* connections scheduled */
__u32 inpkts; /* incoming packets */
__u32 outpkts; /* outgoing packets */
__u64 inbytes; /* incoming bytes */
__u64 outbytes; /* outgoing bytes */
__u32 cps; /* current connection rate */
__u32 inpps; /* current in packet rate */
__u32 outpps; /* current out packet rate */
__u32 inbps; /* current in byte rate */
__u32 outbps; /* current out byte rate */
};
/* The argument to IP_VS_SO_GET_INFO */
struct ip_vs_getinfo {
/* version number */
unsigned int version;
/* size of connection hash table */
unsigned int size;
/* number of virtual services */
unsigned int num_services;
};
/* The argument to IP_VS_SO_GET_SERVICE */
struct ip_vs_service_user {
/* which service: user fills this in */
u_int16_t protocol;
u_int32_t addr; /* virtual address */
u_int16_t port;
u_int32_t fwmark; /* firwall mark of virtual service */
/* service options */
char sched_name[IP_VS_SCHEDNAME_MAXLEN];
unsigned flags; /* virtual service flags */
unsigned timeout; /* persistent timeout in ticks */
u_int32_t netmask; /* persistent netmask */
/* number of real servers */
unsigned int num_dests;
/* statistics */
struct ip_vs_stats_user stats;
};
struct ip_vs_dest_user {
u_int32_t addr; /* destination address */
u_int16_t port;
unsigned flags; /* destination flags */
int weight; /* destination weight */
u_int32_t activeconns; /* active connections */
u_int32_t inactconns; /* inactive connections */
/* statistics */
struct ip_vs_stats_user stats;
};
/* The argument to IP_VS_SO_GET_DESTS */
struct ip_vs_get_dests {
/* which service: user fills this in */
u_int16_t protocol;
u_int32_t addr; /* virtual address */
u_int16_t port;
u_int32_t fwmark; /* firwall mark of virtual service */
/* number of real servers */
unsigned int num_dests;
/* the real servers */
struct ip_vs_dest_user entrytable[0];
};
/* The argument to IP_VS_SO_GET_SERVICES */
struct ip_vs_get_services {
/* number of virtual services */
unsigned int num_services;
/* service table */
struct ip_vs_service_user entrytable[0];
};
/* The argument to IP_VS_SO_GET_TIMEOUTS */
struct ip_vs_timeout_user {
int tcp_timeout;
int tcp_fin_timeout;
int udp_timeout;
};
/* The argument to IP_VS_SO_GET_DAEMON */
struct ip_vs_daemon_user {
int state; /* sync daemon state */
char mcast_master_ifn[IP_VS_IFNAME_MAXLEN]; /* mcast master interface name */
char mcast_backup_ifn[IP_VS_IFNAME_MAXLEN]; /* mcast backup interface name */
};
#ifdef __KERNEL__
#include <linux/config.h>
#include <linux/list.h> /* for struct list_head */
#include <linux/spinlock.h> /* for struct rwlock_t */
#include <linux/skbuff.h> /* for struct sk_buff */
#include <linux/ip.h> /* for struct iphdr */
#include <asm/atomic.h> /* for struct atomic_t */
#include <linux/netdevice.h> /* for struct neighbour; */
#include <net/dst.h> /* for struct dst_entry */
#include <net/route.h> /* for ip_route_output */
#include <net/tcp.h>
#include <net/udp.h>
#ifdef CONFIG_IP_VS_DEBUG
extern int ip_vs_get_debug_level(void);
#define IP_VS_DBG(level, msg...) \
do { \
if (level <= ip_vs_get_debug_level()) \
printk(KERN_DEBUG "IPVS: " msg); \
} while (0)
#define IP_VS_DBG_RL(msg...) \
do { \
if (net_ratelimit()) \
printk(KERN_DEBUG "IPVS: " msg); \
} while (0)
#else /* NO DEBUGGING at ALL */
#define IP_VS_DBG(level, msg...) do {} while (0)
#define IP_VS_DBG_RL(msg...) do {} while (0)
#endif
#define IP_VS_BUG() BUG()
#define IP_VS_ERR(msg...) printk(KERN_ERR "IPVS: " msg)
#define IP_VS_INFO(msg...) printk(KERN_INFO "IPVS: " msg)
#define IP_VS_WARNING(msg...) \
printk(KERN_WARNING "IPVS: " msg)
#define IP_VS_ERR_RL(msg...) \
do { \
if (net_ratelimit()) \
printk(KERN_ERR "IPVS: " msg); \
} while (0)
#ifdef CONFIG_IP_VS_DEBUG
#define EnterFunction(level) \
do { \
if (level <= ip_vs_get_debug_level()) \
printk(KERN_DEBUG "Enter: %s, %s line %i\n", \
__FUNCTION__, __FILE__, __LINE__); \
} while (0)
#define LeaveFunction(level) \
do { \
if (level <= ip_vs_get_debug_level()) \
printk(KERN_DEBUG "Leave: %s, %s line %i\n", \
__FUNCTION__, __FILE__, __LINE__); \
} while (0)
#else
#define EnterFunction(level) do {} while (0)
#define LeaveFunction(level) do {} while (0)
#endif
/*
* The port number of FTP service (in network order).
*/
#define FTPPORT __constant_htons(21)
#define FTPDATA __constant_htons(20)
/*
* IPVS sysctl variables under the /proc/sys/net/ipv4/vs/
*/
#define NET_IPV4_VS 21
enum {
NET_IPV4_VS_DEBUG_LEVEL=1,
NET_IPV4_VS_AMEMTHRESH=2,
NET_IPV4_VS_AMDROPRATE=3,
NET_IPV4_VS_DROP_ENTRY=4,
NET_IPV4_VS_DROP_PACKET=5,
NET_IPV4_VS_SECURE_TCP=6,
NET_IPV4_VS_TO_ES=7,
NET_IPV4_VS_TO_SS=8,
NET_IPV4_VS_TO_SR=9,
NET_IPV4_VS_TO_FW=10,
NET_IPV4_VS_TO_TW=11,
NET_IPV4_VS_TO_CL=12,
NET_IPV4_VS_TO_CW=13,
NET_IPV4_VS_TO_LA=14,
NET_IPV4_VS_TO_LI=15,
NET_IPV4_VS_TO_SA=16,
NET_IPV4_VS_TO_UDP=17,
NET_IPV4_VS_TO_ICMP=18,
NET_IPV4_VS_LBLC_EXPIRE=19,
NET_IPV4_VS_LBLCR_EXPIRE=20,
NET_IPV4_VS_CACHE_BYPASS=22,
NET_IPV4_VS_EXPIRE_NODEST_CONN=23,
NET_IPV4_VS_SYNC_THRESHOLD=24,
NET_IPV4_VS_NAT_ICMP_SEND=25,
NET_IPV4_VS_EXPIRE_QUIESCENT_TEMPLATE=26,
NET_IPV4_VS_LAST
};
/*
* IPVS State Values
*/
enum {
IP_VS_S_NONE = 0,
IP_VS_S_ESTABLISHED,
IP_VS_S_SYN_SENT,
IP_VS_S_SYN_RECV,
IP_VS_S_FIN_WAIT,
IP_VS_S_TIME_WAIT,
IP_VS_S_CLOSE,
IP_VS_S_CLOSE_WAIT,
IP_VS_S_LAST_ACK,
IP_VS_S_LISTEN,
IP_VS_S_SYNACK,
IP_VS_S_UDP,
IP_VS_S_ICMP,
IP_VS_S_LAST
};
struct ip_vs_timeout_table {
atomic_t refcnt;
int scale;
int timeout[IP_VS_S_LAST+1];
};
/*
* Transport protocol header
*/
union ip_vs_tphdr {
unsigned char *raw;
struct udphdr *uh;
struct tcphdr *th;
struct icmphdr *icmph;
__u16 *portp;
};
/*
* Delta sequence info structure
* Each ip_vs_conn has 2 (output AND input seq. changes).
* Only used in the VS/NAT.
*/
struct ip_vs_seq {
__u32 init_seq; /* Add delta from this seq */
__u32 delta; /* Delta in sequence numbers */
__u32 previous_delta; /* Delta in sequence numbers
before last resized pkt */
};
/*
* IPVS statistics object
*/
struct ip_vs_stats
{
__u32 conns; /* connections scheduled */
__u32 inpkts; /* incoming packets */
__u32 outpkts; /* outgoing packets */
__u64 inbytes; /* incoming bytes */
__u64 outbytes; /* outgoing bytes */
__u32 cps; /* current connection rate */
__u32 inpps; /* current in packet rate */
__u32 outpps; /* current out packet rate */
__u32 inbps; /* current in byte rate */
__u32 outbps; /* current out byte rate */
spinlock_t lock; /* spin lock */
};
/*
* IP_VS structure allocated for each dynamically scheduled connection
*/
struct ip_vs_conn {
struct list_head c_list; /* hashed list heads */
/* Protocol, addresses and port numbers */
__u32 caddr; /* client address */
__u32 vaddr; /* virtual address */
__u32 daddr; /* destination address */
__u16 cport;
__u16 vport;
__u16 dport;
__u16 protocol; /* Which protocol (TCP/UDP) */
/* counter and timer */
atomic_t refcnt; /* reference count */
struct timer_list timer; /* Expiration timer */
volatile unsigned long timeout; /* timeout */
struct ip_vs_timeout_table *timeout_table;
/* Flags and state transition */
spinlock_t lock; /* lock for state transition */
volatile __u16 flags; /* status flags */
volatile __u16 state; /* state info */
/* Control members */
struct ip_vs_conn *control; /* Master control connection */
atomic_t n_control; /* Number of controlled ones */
struct ip_vs_dest *dest; /* real server */
atomic_t in_pkts; /* incoming packet counter */
/* packet transmitter for different forwarding methods */
int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp);
/* Note: we can group the following members into a structure,
in order to save more space, and the following members are
only used in VS/NAT anyway */
struct ip_vs_app *app; /* bound ip_vs_app object */
void *app_data; /* Application private data */
struct ip_vs_seq in_seq; /* incoming seq. struct */
struct ip_vs_seq out_seq; /* outgoing seq. struct */
};
/*
* The information about the virtual service offered to the net
* and the forwarding entries
*/
struct ip_vs_service {
struct list_head s_list; /* for normal service table */
struct list_head f_list; /* for fwmark-based service table */
atomic_t refcnt; /* reference counter */
atomic_t usecnt; /* use counter */
__u16 protocol; /* which protocol (TCP/UDP) */
__u32 addr; /* IP address for virtual service */
__u16 port; /* port number for the service */
__u32 fwmark; /* firewall mark of the service */
unsigned flags; /* service status flags */
unsigned timeout; /* persistent timeout in ticks */
__u32 netmask; /* grouping granularity */
struct list_head destinations; /* real server d-linked list */
__u32 num_dests; /* number of servers */
struct ip_vs_stats stats; /* statistics for the service */
/* for scheduling */
struct ip_vs_scheduler *scheduler; /* bound scheduler object */
rwlock_t sched_lock; /* lock sched_data */
void *sched_data; /* scheduler application data */
};
/*
* The real server destination forwarding entry
* with ip address, port number, and so on.
*/
struct ip_vs_dest {
struct list_head n_list; /* for the dests in the service */
struct list_head d_list; /* for table with all the dests */
__u32 addr; /* IP address of real server */
__u16 port; /* port number of the service */
unsigned flags; /* dest status flags */
atomic_t weight; /* server weight */
atomic_t conn_flags; /* flags to copy to conn */
atomic_t activeconns; /* active connections */
atomic_t inactconns; /* inactive connections */
atomic_t refcnt; /* reference counter */
struct ip_vs_stats stats; /* statistics */
/* for destination cache */
spinlock_t dst_lock; /* lock dst_cache */
struct dst_entry *dst_cache; /* destination cache entry */
u32 dst_rtos; /* RT_TOS(tos) for dst */
/* for virtual service */
struct ip_vs_service *svc; /* service that it belongs to */
__u16 protocol; /* which protocol (TCP/UDP) */
__u32 vaddr; /* IP address for virtual service */
__u16 vport; /* port number for the service */
__u32 vfwmark; /* firewall mark of the service */
};
/*
* The scheduler object
*/
struct ip_vs_scheduler {
struct list_head n_list; /* d-linked list head */
char *name; /* scheduler name */
atomic_t refcnt; /* reference counter */
struct module *module; /* THIS_MODULE/NULL */
/* scheduler initializing service */
int (*init_service)(struct ip_vs_service *svc);
/* scheduling service finish */
int (*done_service)(struct ip_vs_service *svc);
/* scheduler updating service */
int (*update_service)(struct ip_vs_service *svc);
/* selecting a server from the given service */
struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc,
struct iphdr *iph);
};
/*
* The application module object
*/
struct ip_vs_app
{
struct list_head n_list; /* d-linked list head */
char *name; /* name of application module */
unsigned type; /* type = proto<<16 | port
(host byte order)*/
struct module *module; /* THIS_MODULE/NULL */
/* ip_vs_app initializer */
int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *);
/* ip_vs_app finish */
int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *);
/* output hook */
int (*pkt_out)(struct ip_vs_app *,
struct ip_vs_conn *, struct sk_buff *);
/* input hook */
int (*pkt_in)(struct ip_vs_app *,
struct ip_vs_conn *, struct sk_buff *);
};
/*
* IPVS core functions
* (from ip_vs_core.c)
*/
extern const char *ip_vs_proto_name(unsigned proto);
extern unsigned int check_for_ip_vs_out(struct sk_buff **skb_p,
int (*okfn)(struct sk_buff *));
/*
* ip_vs_conn handling functions
* (from ip_vs_conn.c)
*/
/*
* IPVS connection entry hash table
*/
#ifndef CONFIG_IP_VS_TAB_BITS
#define CONFIG_IP_VS_TAB_BITS 12
#endif
/* make sure that IP_VS_CONN_TAB_BITS is located in [8, 20] */
#if CONFIG_IP_VS_TAB_BITS < 8
#define IP_VS_CONN_TAB_BITS 8
#endif
#if CONFIG_IP_VS_TAB_BITS > 20
#define IP_VS_CONN_TAB_BITS 20
#endif
#if 8 <= CONFIG_IP_VS_TAB_BITS && CONFIG_IP_VS_TAB_BITS <= 20
#define IP_VS_CONN_TAB_BITS CONFIG_IP_VS_TAB_BITS
#endif
#define IP_VS_CONN_TAB_SIZE (1 << IP_VS_CONN_TAB_BITS)
#define IP_VS_CONN_TAB_MASK (IP_VS_CONN_TAB_SIZE - 1)
#define VS_STATE_INPUT 0
#define VS_STATE_OUTPUT 4
#define VS_STATE_INPUT_ONLY 8
extern struct ip_vs_timeout_table vs_timeout_table;
extern struct ip_vs_timeout_table vs_timeout_table_dos;
extern struct ip_vs_conn *ip_vs_conn_in_get
(int protocol, __u32 s_addr, __u16 s_port, __u32 d_addr, __u16 d_port);
extern struct ip_vs_conn *ip_vs_ct_in_get
(int protocol, __u32 s_addr, __u16 s_port, __u32 d_addr, __u16 d_port);
extern struct ip_vs_conn *ip_vs_conn_out_get
(int protocol, __u32 s_addr, __u16 s_port, __u32 d_addr, __u16 d_port);
/* put back the conn without restarting its timer */
static inline void __ip_vs_conn_put(struct ip_vs_conn *cp)
{
atomic_dec(&cp->refcnt);
}
extern void ip_vs_conn_put(struct ip_vs_conn *cp);
extern struct ip_vs_conn *
ip_vs_conn_new(int proto, __u32 caddr, __u16 cport, __u32 vaddr, __u16 vport,
__u32 daddr, __u16 dport, unsigned flags,
struct ip_vs_dest *dest);
extern void ip_vs_conn_expire_now(struct ip_vs_conn *cp);
extern const char * ip_vs_state_name(int state);
extern int ip_vs_set_state(struct ip_vs_conn *cp, int state_off,
struct iphdr *iph, void *tp);
extern int ip_vs_conn_listen(struct ip_vs_conn *cp);
extern int ip_vs_check_template(struct ip_vs_conn *ct);
extern void ip_vs_secure_tcp_set(int on);
extern void ip_vs_random_dropentry(void);
extern int ip_vs_conn_init(void);
extern void ip_vs_conn_cleanup(void);
static inline void ip_vs_control_del(struct ip_vs_conn *cp)
{
struct ip_vs_conn *ctl_cp = cp->control;
if (!ctl_cp) {
IP_VS_ERR("request control DEL for uncontrolled: "
"%d.%d.%d.%d:%d to %d.%d.%d.%d:%d\n",
NIPQUAD(cp->caddr),ntohs(cp->cport),
NIPQUAD(cp->vaddr),ntohs(cp->vport));
return;
}
IP_VS_DBG(7, "DELeting control for: "
"cp.dst=%d.%d.%d.%d:%d ctl_cp.dst=%d.%d.%d.%d:%d\n",
NIPQUAD(cp->caddr),ntohs(cp->cport),
NIPQUAD(ctl_cp->caddr),ntohs(ctl_cp->cport));
cp->control = NULL;
if (atomic_read(&ctl_cp->n_control) == 0) {
IP_VS_ERR("BUG control DEL with n=0 : "
"%d.%d.%d.%d:%d to %d.%d.%d.%d:%d\n",
NIPQUAD(cp->caddr),ntohs(cp->cport),
NIPQUAD(cp->vaddr),ntohs(cp->vport));
return;
}
atomic_dec(&ctl_cp->n_control);
}
static inline void
ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp)
{
if (cp->control) {
IP_VS_ERR("request control ADD for already controlled: "
"%d.%d.%d.%d:%d to %d.%d.%d.%d:%d\n",
NIPQUAD(cp->caddr),ntohs(cp->cport),
NIPQUAD(cp->vaddr),ntohs(cp->vport));
ip_vs_control_del(cp);
}
IP_VS_DBG(7, "ADDing control for: "
"cp.dst=%d.%d.%d.%d:%d ctl_cp.dst=%d.%d.%d.%d:%d\n",
NIPQUAD(cp->caddr),ntohs(cp->cport),
NIPQUAD(ctl_cp->caddr),ntohs(ctl_cp->cport));
cp->control = ctl_cp;
atomic_inc(&ctl_cp->n_control);
}
/*
* IPVS application functions
* (from ip_vs_app.c)
*/
#define IP_VS_APP_MAX_PORTS 8
extern int register_ip_vs_app(struct ip_vs_app *mapp,
unsigned short proto, __u16 port);
extern int unregister_ip_vs_app(struct ip_vs_app *mapp);
extern struct ip_vs_app * ip_vs_bind_app(struct ip_vs_conn *cp);
extern int ip_vs_unbind_app(struct ip_vs_conn *cp);
extern int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb);
extern int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb);
extern int ip_vs_skb_replace(struct sk_buff *skb, int pri,
char *o_buf, int o_len, char *n_buf, int n_len);
extern int ip_vs_app_init(void);
extern void ip_vs_app_cleanup(void);
/*
* Registering/unregistering scheduler functions
* (from ip_vs_sched.c)
*/
extern int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
extern int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
extern int ip_vs_bind_scheduler(struct ip_vs_service *svc,
struct ip_vs_scheduler *scheduler);
extern int ip_vs_unbind_scheduler(struct ip_vs_service *svc);
extern struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name);
extern void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler);
/*
* IPVS control data and functions
* (from ip_vs_ctl.c)
*/
extern int sysctl_ip_vs_cache_bypass;
extern int sysctl_ip_vs_expire_nodest_conn;
extern int sysctl_ip_vs_expire_quiescent_template;
extern int sysctl_ip_vs_sync_threshold;
extern int sysctl_ip_vs_nat_icmp_send;
extern struct ip_vs_stats ip_vs_stats;
extern struct ip_vs_service *ip_vs_service_get(__u32 fwmark,
__u16 protocol,
__u32 vaddr, __u16 vport);
static inline void ip_vs_service_put(struct ip_vs_service *svc)
{
atomic_dec(&svc->usecnt);
}
extern struct ip_vs_dest *
ip_vs_lookup_real_service(__u16 protocol, __u32 daddr, __u16 dport);
extern void ip_vs_random_dropentry(void);
extern int ip_vs_control_init(void);
extern void ip_vs_control_cleanup(void);
/*
* IPVS sync daemon data and function prototypes
* (from ip_vs_sync.c)
*/
extern volatile int ip_vs_sync_state;
extern char ip_vs_mcast_master_ifn[IP_VS_IFNAME_MAXLEN];
extern char ip_vs_mcast_backup_ifn[IP_VS_IFNAME_MAXLEN];
extern int start_sync_thread(int state, char *mcast_ifn, __u8 syncid);
extern int stop_sync_thread(int state);
extern void ip_vs_sync_conn(struct ip_vs_conn *cp);
/*
* IPVS rate estimator prototypes (from ip_vs_est.c)
*/
extern int ip_vs_new_estimator(struct ip_vs_stats *stats);
extern void ip_vs_kill_estimator(struct ip_vs_stats *stats);
extern void ip_vs_zero_estimator(struct ip_vs_stats *stats);
/*
* This is a simple mechanism to ignore packets when
* we are loaded. Just set ip_vs_drop_rate to 'n' and
* we start to drop 1/rate of the packets
*/
extern int ip_vs_drop_rate;
extern int ip_vs_drop_counter;
static __inline__ int ip_vs_todrop(void)
{
if (!ip_vs_drop_rate) return 0;
if (--ip_vs_drop_counter > 0) return 0;
ip_vs_drop_counter = ip_vs_drop_rate;
return 1;
}
/*
* ip_vs_fwd_tag returns the forwarding tag of the connection
*/
#define IP_VS_FWD_METHOD(cp) (cp->flags & IP_VS_CONN_F_FWD_MASK)
extern __inline__ char ip_vs_fwd_tag(struct ip_vs_conn *cp)
{
char fwd;
switch (IP_VS_FWD_METHOD(cp)) {
case IP_VS_CONN_F_MASQ:
fwd = 'M'; break;
case IP_VS_CONN_F_LOCALNODE:
fwd = 'L'; break;
case IP_VS_CONN_F_TUNNEL:
fwd = 'T'; break;
case IP_VS_CONN_F_DROUTE:
fwd = 'R'; break;
case IP_VS_CONN_F_BYPASS:
fwd = 'B'; break;
default:
fwd = '?'; break;
}
return fwd;
}
/*
* transport layer header checking
*/
extern inline int ip_vs_header_check(struct sk_buff *skb, int proto, int ihl)
{
int len;
switch (proto) {
case IPPROTO_TCP:
len = ihl + sizeof(struct tcphdr);
/* we don't care about TCP options */
break;
case IPPROTO_UDP:
len = ihl + sizeof(struct udphdr);
break;
default:
len = 0;
}
/* guarantee protocol header available in skb data area */
if (!pskb_may_pull(skb, len))
return -1;
else
return 0;
}
/*
* Destination cache
*/
static inline void
__ip_vs_dst_set(struct ip_vs_dest *dest, u32 rtos, struct dst_entry *dst)
{
struct dst_entry *old_dst;
old_dst = dest->dst_cache;
dest->dst_cache = dst;
dest->dst_rtos = rtos;
dst_release(old_dst);
}
static inline void
__ip_vs_dst_reset(struct ip_vs_dest *dest)
{
struct dst_entry *old_dst;
old_dst = dest->dst_cache;
dest->dst_cache = NULL;
dst_release(old_dst);
}
static inline struct dst_entry *
__ip_vs_dst_check(struct ip_vs_dest *dest, u32 rtos, u32 cookie)
{
struct dst_entry *dst = dest->dst_cache;
if (!dst)
return NULL;
if ((dst->obsolete || rtos != dest->dst_rtos) &&
dst->ops->check(dst, cookie) == NULL) {
dest->dst_cache = 0;
return NULL;
}
dst_hold(dst);
return dst;
}
static inline struct rtable *
__ip_vs_get_out_rt(struct ip_vs_conn *cp, u32 rtos)
{
struct rtable *rt; /* Route to the other host */
struct ip_vs_dest *dest = cp->dest;
if (dest) {
spin_lock(&dest->dst_lock);
if (!(rt = (struct rtable *)
__ip_vs_dst_check(dest, rtos, 0))) {
if (ip_route_output(&rt, dest->addr, 0, rtos, 0)) {
spin_unlock(&dest->dst_lock);
IP_VS_DBG_RL("ip_route_output error, "
"dest: %u.%u.%u.%u\n",
NIPQUAD(dest->addr));
return NULL;
}
__ip_vs_dst_set(dest, rtos, dst_clone(&rt->u.dst));
IP_VS_DBG(10, "new dst %u.%u.%u.%u, refcnt=%d, rtos=%X\n",
NIPQUAD(dest->addr),
atomic_read(&rt->u.dst.__refcnt), rtos);
}
spin_unlock(&dest->dst_lock);
} else {
if (ip_route_output(&rt, cp->daddr, 0, rtos, 0)) {
IP_VS_DBG_RL("ip_route_output error, dest: "
"%u.%u.%u.%u\n", NIPQUAD(cp->daddr));
return NULL;
}
}
return rt;
}
static inline u16 ip_vs_check_diff(u32 old, u32 new, u16 oldsum)
{
u32 diff[2] = { old, new };
return csum_fold(csum_partial((char *) diff, sizeof(diff),
oldsum ^ 0xFFFF));
}
static inline void ip_vs_fast_check_update(union ip_vs_tphdr *h,
u32 oldip, u32 newip, u16 oldport, u16 newport, u8 protocol)
{
u16 *checkp;
if (protocol == IPPROTO_TCP)
checkp = &h->th->check;
else
checkp = &h->uh->check;
*checkp = ip_vs_check_diff(~oldip, newip,
ip_vs_check_diff(oldport ^ 0xFFFF,
newport, *checkp));
if (!*checkp && protocol == IPPROTO_UDP)
*checkp = 0xFFFF;
}
static inline int
ip_vs_skb_cow(struct sk_buff *skb, unsigned int headroom,
struct iphdr **iph_p, unsigned char **t_p)
{
int delta = (headroom > 16 ? headroom : 16) - skb_headroom(skb);
if (delta < 0)
delta = 0;
if (delta || skb_cloned(skb)) {
if (pskb_expand_head(skb, (delta+15)&~15, 0, GFP_ATOMIC))
return -ENOMEM;
/* skb data changed, update pointers */
*iph_p = skb->nh.iph;
*t_p = (char*) (*iph_p) + (*iph_p)->ihl * 4;
}
return 0;
}
#endif /* __KERNEL__ */
#endif /* _IP_VS_H */
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