patch-2.4.23 linux-2.4.23/include/net/ip_vs.h
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- Lines: 933
- Date:
2003-11-28 10:26:21.000000000 -0800
- Orig file:
linux-2.4.22/include/net/ip_vs.h
- Orig date:
1969-12-31 16:00:00.000000000 -0800
diff -urN linux-2.4.22/include/net/ip_vs.h linux-2.4.23/include/net/ip_vs.h
@@ -0,0 +1,932 @@
+/*
+ * 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 0x01000A
+#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 */
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)