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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [include/] [net/] [ip_vs.h] - Blame information for rev 1774

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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            0x01000B
#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 */
 
/* 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 */
 
        /* 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_ifn[IP_VS_IFNAME_MAXLEN]; /* multicast 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_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_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_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_ifn[IP_VS_IFNAME_MAXLEN];
extern int start_sync_thread(int state, char *mcast_ifn);
extern int stop_sync_thread(void);
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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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [include/] [net/] [ip_vs.h] - Blame information for rev 1774

Line No.	Rev	Author	Line
1	1275	phoenix	`/*`
2			`* IP Virtual Server`
3			`* data structure and functionality definitions`
4			`*/`
5
6			`#ifndef _IP_VS_H`
7			`#define _IP_VS_H`
8
9			`#include <asm/types.h> /* For __uXX types */`
10
11			`#define IP_VS_VERSION_CODE 0x01000B`
12			`#define NVERSION(version) \`
13			`(version >> 16) & 0xFF, \`
14			`(version >> 8) & 0xFF, \`
15			`version & 0xFF`
16
17			`/*`
18			`* Virtual Service Flags`
19			`*/`
20			`#define IP_VS_SVC_F_PERSISTENT 0x0001 /* persistent port */`
21			`#define IP_VS_SVC_F_HASHED 0x0002 /* hashed entry */`
22
23			`/*`
24			`* Destination Server Flags`
25			`*/`
26			`#define IP_VS_DEST_F_AVAILABLE 0x0001 /* Available tag */`
27
28			`/*`
29			`* IPVS sync daemon states`
30			`*/`
31			`#define IP_VS_STATE_NONE 0 /* daemon is stopped */`
32			`#define IP_VS_STATE_MASTER 1 /* started as master */`
33			`#define IP_VS_STATE_BACKUP 2 /* started as backup */`
34
35			`/*`
36			`* IPVS socket options`
37			`*/`
38			`#define IP_VS_BASE_CTL (64+1024+64) /* base */`
39
40			`#define IP_VS_SO_SET_NONE IP_VS_BASE_CTL /* just peek */`