/* * IP Virtual Server * data structure and functionality definitions */ #ifndef _IP_VS_H #define _IP_VS_H #include <asm/types.h> /* For __uXX types */ #include <linux/types.h> /* For __beXX types in userland */ #include <linux/sysctl.h> /* For ctl_path */ #define IP_VS_VERSION_CODE 0x010201 #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 /* server is available */ #define IP_VS_DEST_F_OVERLOAD 0x0002 /* server is overloaded */ /* * IPVS sync daemon states */ #define IP_VS_STATE_NONE 0x0000 /* daemon is stopped */ #define IP_VS_STATE_MASTER 0x0001 /* started as master */ #define IP_VS_STATE_BACKUP 0x0002 /* 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_TIMEOUT (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_TIMEOUT (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/NAT */ #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_SYNC 0x0020 /* entry created by sync */ #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 /* * The struct ip_vs_service_user and struct ip_vs_dest_user are * used to set IPVS rules through setsockopt. */ struct ip_vs_service_user { /* virtual service addresses */ u_int16_t protocol; __be32 addr; /* virtual ip address */ __be16 port; u_int32_t fwmark; /* firwall mark of service */ /* virtual service options */ char sched_name[IP_VS_SCHEDNAME_MAXLEN]; unsigned flags; /* virtual service flags */ unsigned timeout; /* persistent timeout in sec */ __be32 netmask; /* persistent netmask */ }; struct ip_vs_dest_user { /* destination server address */ __be32 addr; __be16 port; /* real server options */ unsigned conn_flags; /* connection flags */ int weight; /* destination weight */ /* thresholds for active connections */ u_int32_t u_threshold; /* upper threshold */ u_int32_t l_threshold; /* lower threshold */ }; /* * 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_entry { /* which service: user fills in these */ u_int16_t protocol; __be32 addr; /* virtual address */ __be16 port; u_int32_t fwmark; /* firwall mark of service */ /* service options */ char sched_name[IP_VS_SCHEDNAME_MAXLEN]; unsigned flags; /* virtual service flags */ unsigned timeout; /* persistent timeout */ __be32 netmask; /* persistent netmask */ /* number of real servers */ unsigned int num_dests; /* statistics */ struct ip_vs_stats_user stats; }; struct ip_vs_dest_entry { __be32 addr; /* destination address */ __be16 port; unsigned conn_flags; /* connection flags */ int weight; /* destination weight */ u_int32_t u_threshold; /* upper threshold */ u_int32_t l_threshold; /* lower threshold */ u_int32_t activeconns; /* active connections */ u_int32_t inactconns; /* inactive connections */ u_int32_t persistconns; /* persistent 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 in these */ u_int16_t protocol; __be32 addr; /* virtual address */ __be16 port; u_int32_t fwmark; /* firwall mark of service */ /* number of real servers */ unsigned int num_dests; /* the real servers */ struct ip_vs_dest_entry 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_entry entrytable[0]; }; /* The argument to IP_VS_SO_GET_TIMEOUT */ 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 { /* sync daemon state (master/backup) */ int state; /* multicast interface name */ char mcast_ifn[IP_VS_IFNAME_MAXLEN]; /* SyncID we belong to */ int syncid; }; #ifdef __KERNEL__ #include <linux/list.h> /* for struct list_head */ #include <linux/spinlock.h> /* for struct rwlock_t */ #include <asm/atomic.h> /* for struct atomic_t */ #include <linux/compiler.h> #include <linux/timer.h> #include <net/checksum.h> #ifdef CONFIG_IP_VS_DEBUG #include <linux/net.h> 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) #define IP_VS_DBG_PKT(level, pp, skb, ofs, msg) \ do { \ if (level <= ip_vs_get_debug_level()) \ pp->debug_packet(pp, skb, ofs, msg); \ } while (0) #define IP_VS_DBG_RL_PKT(level, pp, skb, ofs, msg) \ do { \ if (level <= ip_vs_get_debug_level() && \ net_ratelimit()) \ pp->debug_packet(pp, skb, ofs, 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) #define IP_VS_DBG_PKT(level, pp, skb, ofs, msg) do {} while (0) #define IP_VS_DBG_RL_PKT(level, pp, skb, ofs, 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 #define IP_VS_WAIT_WHILE(expr) while (expr) { cpu_relax(); } /* * The port number of FTP service (in network order). */ #define FTPPORT __constant_htons(21) #define FTPDATA __constant_htons(20) /* * TCP State Values */ enum { IP_VS_TCP_S_NONE = 0, IP_VS_TCP_S_ESTABLISHED, IP_VS_TCP_S_SYN_SENT, IP_VS_TCP_S_SYN_RECV, IP_VS_TCP_S_FIN_WAIT, IP_VS_TCP_S_TIME_WAIT, IP_VS_TCP_S_CLOSE, IP_VS_TCP_S_CLOSE_WAIT, IP_VS_TCP_S_LAST_ACK, IP_VS_TCP_S_LISTEN, IP_VS_TCP_S_SYNACK, IP_VS_TCP_S_LAST }; /* * UDP State Values */ enum { IP_VS_UDP_S_NORMAL, IP_VS_UDP_S_LAST, }; /* * ICMP State Values */ enum { IP_VS_ICMP_S_NORMAL, IP_VS_ICMP_S_LAST, }; /* * 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 */ }; struct dst_entry; struct iphdr; struct ip_vs_conn; struct ip_vs_app; struct sk_buff; struct ip_vs_protocol { struct ip_vs_protocol *next; char *name; u16 protocol; u16 num_states; int dont_defrag; atomic_t appcnt; /* counter of proto app incs */ int *timeout_table; /* protocol timeout table */ void (*init)(struct ip_vs_protocol *pp); void (*exit)(struct ip_vs_protocol *pp); int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_protocol *pp, int *verdict, struct ip_vs_conn **cpp); struct ip_vs_conn * (*conn_in_get)(const struct sk_buff *skb, struct ip_vs_protocol *pp, const struct iphdr *iph, unsigned int proto_off, int inverse); struct ip_vs_conn * (*conn_out_get)(const struct sk_buff *skb, struct ip_vs_protocol *pp, const struct iphdr *iph, unsigned int proto_off, int inverse); int (*snat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp, struct ip_vs_conn *cp); int (*dnat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp, struct ip_vs_conn *cp); int (*csum_check)(struct sk_buff *skb, struct ip_vs_protocol *pp); const char *(*state_name)(int state); int (*state_transition)(struct ip_vs_conn *cp, int direction, const struct sk_buff *skb, struct ip_vs_protocol *pp); int (*register_app)(struct ip_vs_app *inc); void (*unregister_app)(struct ip_vs_app *inc); int (*app_conn_bind)(struct ip_vs_conn *cp); void (*debug_packet)(struct ip_vs_protocol *pp, const struct sk_buff *skb, int offset, const char *msg); void (*timeout_change)(struct ip_vs_protocol *pp, int flags); int (*set_state_timeout)(struct ip_vs_protocol *pp, char *sname, int to); }; extern struct ip_vs_protocol * ip_vs_proto_get(unsigned short proto); /* * 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 */ __be32 caddr; /* client address */ __be32 vaddr; /* virtual address */ __be32 daddr; /* destination address */ __be16 cport; __be16 vport; __be16 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 */ /* Flags and state transition */ spinlock_t lock; /* lock for state transition */ volatile __u16 flags; /* status flags */ volatile __u16 state; /* state info */ volatile __u16 old_state; /* old state, to be used for * state transition triggerd * synchronization */ /* 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. If it mangles the packet, it must return NF_DROP or better NF_STOLEN, otherwise this must be changed to a sk_buff **. */ int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); /* 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) */ __be32 addr; /* IP address for virtual service */ __be16 port; /* port number for the service */ __u32 fwmark; /* firewall mark of the service */ unsigned flags; /* service status flags */ unsigned timeout; /* persistent timeout in ticks */ __be32 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 */ struct ip_vs_app *inc; /* bind conns to this app inc */ /* 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 */ __be32 addr; /* IP address of the server */ __be16 port; /* port number of the server */ volatile unsigned flags; /* dest status flags */ atomic_t conn_flags; /* flags to copy to conn */ atomic_t weight; /* server weight */ atomic_t refcnt; /* reference counter */ struct ip_vs_stats stats; /* statistics */ /* connection counters and thresholds */ atomic_t activeconns; /* active connections */ atomic_t inactconns; /* inactive connections */ atomic_t persistconns; /* persistent connections */ __u32 u_threshold; /* upper threshold */ __u32 l_threshold; /* lower threshold */ /* for destination cache */ spinlock_t dst_lock; /* lock of 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 it belongs to */ __u16 protocol; /* which protocol (TCP/UDP) */ __be32 vaddr; /* virtual IP address */ __be16 vport; /* virtual port number */ __u32 vfwmark; /* firewall mark of 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, const struct sk_buff *skb); }; /* * The application module object (a.k.a. app incarnation) */ struct ip_vs_app { struct list_head a_list; /* member in app list */ int type; /* IP_VS_APP_TYPE_xxx */ char *name; /* application module name */ __u16 protocol; struct module *module; /* THIS_MODULE/NULL */ struct list_head incs_list; /* list of incarnations */ /* members for application incarnations */ struct list_head p_list; /* member in proto app list */ struct ip_vs_app *app; /* its real application */ __be16 port; /* port number in net order */ atomic_t usecnt; /* usage counter */ /* output hook: return false if can't linearize. diff set for TCP. */ int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *, struct sk_buff *, int *diff); /* input hook: return false if can't linearize. diff set for TCP. */ int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *, struct sk_buff *, int *diff); /* 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 *); /* not used now */ int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *, struct ip_vs_protocol *); void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *); int * timeout_table; int * timeouts; int timeouts_size; int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app, int *verdict, struct ip_vs_conn **cpp); struct ip_vs_conn * (*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app, const struct iphdr *iph, unsigned int proto_off, int inverse); struct ip_vs_conn * (*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app, const struct iphdr *iph, unsigned int proto_off, int inverse); int (*state_transition)(struct ip_vs_conn *cp, int direction, const struct sk_buff *skb, struct ip_vs_app *app); void (*timeout_change)(struct ip_vs_app *app, int flags); }; /* * IPVS core functions * (from ip_vs_core.c) */ extern const char *ip_vs_proto_name(unsigned proto); extern void ip_vs_init_hash_table(struct list_head *table, int rows); #define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table(t, sizeof(t)/sizeof(t[0])) #define IP_VS_APP_TYPE_FTP 1 /* * 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) enum { IP_VS_DIR_INPUT = 0, IP_VS_DIR_OUTPUT, IP_VS_DIR_INPUT_ONLY, IP_VS_DIR_LAST, }; extern struct ip_vs_conn *ip_vs_conn_in_get (int protocol, __be32 s_addr, __be16 s_port, __be32 d_addr, __be16 d_port); extern struct ip_vs_conn *ip_vs_ct_in_get (int protocol, __be32 s_addr, __be16 s_port, __be32 d_addr, __be16 d_port); extern struct ip_vs_conn *ip_vs_conn_out_get (int protocol, __be32 s_addr, __be16 s_port, __be32 d_addr, __be16 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 void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport); extern struct ip_vs_conn * ip_vs_conn_new(int proto, __be32 caddr, __be16 cport, __be32 vaddr, __be16 vport, __be32 daddr, __be16 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(__u16 proto, int state); extern void ip_vs_tcp_conn_listen(struct ip_vs_conn *cp); extern int ip_vs_check_template(struct ip_vs_conn *ct); 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 *app); extern void unregister_ip_vs_app(struct ip_vs_app *app); extern int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp); extern void ip_vs_unbind_app(struct ip_vs_conn *cp); extern int register_ip_vs_app_inc(struct ip_vs_app *app, __u16 proto, __u16 port); extern int ip_vs_app_inc_get(struct ip_vs_app *inc); extern void ip_vs_app_inc_put(struct ip_vs_app *inc); 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, gfp_t 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); /* * IPVS protocol functions (from ip_vs_proto.c) */ extern int ip_vs_protocol_init(void); extern void ip_vs_protocol_cleanup(void); extern void ip_vs_protocol_timeout_change(int flags); extern int *ip_vs_create_timeout_table(int *table, int size); extern int ip_vs_set_state_timeout(int *table, int num, char **names, char *name, int to); extern void ip_vs_tcpudp_debug_packet(struct ip_vs_protocol *pp, const struct sk_buff *skb, int offset, const char *msg); extern struct ip_vs_protocol ip_vs_protocol_tcp; extern struct ip_vs_protocol ip_vs_protocol_udp; extern struct ip_vs_protocol ip_vs_protocol_icmp; extern struct ip_vs_protocol ip_vs_protocol_esp; extern struct ip_vs_protocol ip_vs_protocol_ah; /* * 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); extern struct ip_vs_conn * ip_vs_schedule(struct ip_vs_service *svc, const struct sk_buff *skb); extern int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb, struct ip_vs_protocol *pp); /* * 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[2]; extern int sysctl_ip_vs_nat_icmp_send; extern struct ip_vs_stats ip_vs_stats; extern struct ctl_path net_vs_ctl_path[]; extern struct ip_vs_service * ip_vs_service_get(__u32 fwmark, __u16 protocol, __be32 vaddr, __be16 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, __be32 daddr, __be16 dport); extern int ip_vs_use_count_inc(void); extern void ip_vs_use_count_dec(void); extern int ip_vs_control_init(void); extern void ip_vs_control_cleanup(void); extern struct ip_vs_dest * ip_vs_find_dest(__be32 daddr, __be16 dport, __be32 vaddr, __be16 vport, __u16 protocol); extern struct ip_vs_dest *ip_vs_try_bind_dest(struct ip_vs_conn *cp); /* * IPVS sync daemon data and function prototypes * (from ip_vs_sync.c) */ extern volatile int ip_vs_sync_state; extern volatile int ip_vs_master_syncid; extern volatile int ip_vs_backup_syncid; extern char ip_vs_master_mcast_ifn[IP_VS_IFNAME_MAXLEN]; extern char ip_vs_backup_mcast_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); /* * Various IPVS packet transmitters (from ip_vs_xmit.c) */ extern int ip_vs_null_xmit (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); extern int ip_vs_bypass_xmit (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); extern int ip_vs_nat_xmit (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); extern int ip_vs_tunnel_xmit (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); extern int ip_vs_dr_xmit (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); extern int ip_vs_icmp_xmit (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp, int offset); extern void ip_vs_dst_reset(struct ip_vs_dest *dest); /* * 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) static 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; } extern void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp, struct ip_vs_conn *cp, int dir); extern __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset); static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum) { __be32 diff[2] = { ~old, new }; return csum_partial((char *) diff, sizeof(diff), oldsum); } static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum) { __be16 diff[2] = { ~old, new }; return csum_partial((char *) diff, sizeof(diff), oldsum); } #endif /* __KERNEL__ */ #endif /* _IP_VS_H */