diff options
Diffstat (limited to 'include/net/ip_vs.h')
| -rw-r--r-- | include/net/ip_vs.h | 999 |
1 files changed, 999 insertions, 0 deletions
diff --git a/include/net/ip_vs.h b/include/net/ip_vs.h new file mode 100644 index 000000000000..52da5d26617a --- /dev/null +++ b/include/net/ip_vs.h @@ -0,0 +1,999 @@ +/* + * 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 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 */ + +/* 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; + u_int32_t addr; /* virtual ip address */ + u_int16_t 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 */ + u_int32_t netmask; /* persistent netmask */ +}; + + +struct ip_vs_dest_user { + /* destination server address */ + u_int32_t addr; + u_int16_t 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; + u_int32_t addr; /* virtual address */ + u_int16_t 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 */ + 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_entry { + u_int32_t addr; /* destination address */ + u_int16_t 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; + u_int32_t addr; /* virtual address */ + u_int16_t 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/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/tcp.h> +#include <net/udp.h> +#include <linux/compiler.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) +#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) + +/* + * 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 +}; + +/* + * 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 ip_vs_conn; +struct ip_vs_app; + +struct ip_vs_protocol { + struct ip_vs_protocol *next; + char *name; + __u16 protocol; + 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 **pskb, + struct ip_vs_protocol *pp, struct ip_vs_conn *cp); + + int (*dnat_handler)(struct sk_buff **pskb, + 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 */ + __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 */ + + /* 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. 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) */ + __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 */ + 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 */ + + __u32 addr; /* IP address of the server */ + __u16 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) */ + __u32 vaddr; /* virtual IP address */ + __u16 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 */ + __u16 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_UNSPEC 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, __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 void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __u16 cport); + +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(__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_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 *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 **pskb); +extern int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff **pskb); +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); + + +/* + * 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 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 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); + + +/* + * 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) + +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; +} + +extern int ip_vs_make_skb_writable(struct sk_buff **pskb, int len); +extern void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp, + struct ip_vs_conn *cp, int dir); + +extern u16 ip_vs_checksum_complete(struct sk_buff *skb, int offset); + +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)); +} + +#endif /* __KERNEL__ */ + +#endif /* _IP_VS_H */ |