Linux-2.6.33.2/include/net/ip_vs.h
/*
* IP Virtual Server
* data structure and functionality definitions
*/
#ifndef _NET_IP_VS_H
#define _NET_IP_VS_H
#include <linux/ip_vs.h> /* definitions shared with userland */
/* old ipvsadm versions still include this file directly */
#ifdef __KERNEL__
#include <asm/types.h> /* for __uXX types */
#include <linux/sysctl.h> /* for ctl_path */
#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>
#include <linux/netfilter.h> /* for union nf_inet_addr */
#include <linux/ip.h>
#include <linux/ipv6.h> /* for struct ipv6hdr */
#include <net/ipv6.h> /* for ipv6_addr_copy */
struct ip_vs_iphdr {
int len;
__u8 protocol;
union nf_inet_addr saddr;
union nf_inet_addr daddr;
};
static inline void
ip_vs_fill_iphdr(int af, const void *nh, struct ip_vs_iphdr *iphdr)
{
#ifdef CONFIG_IP_VS_IPV6
if (af == AF_INET6) {
const struct ipv6hdr *iph = nh;
iphdr->len = sizeof(struct ipv6hdr);
iphdr->protocol = iph->nexthdr;
ipv6_addr_copy(&iphdr->saddr.in6, &iph->saddr);
ipv6_addr_copy(&iphdr->daddr.in6, &iph->daddr);
} else
#endif
{
const struct iphdr *iph = nh;
iphdr->len = iph->ihl * 4;
iphdr->protocol = iph->protocol;
iphdr->saddr.ip = iph->saddr;
iphdr->daddr.ip = iph->daddr;
}
}
static inline void ip_vs_addr_copy(int af, union nf_inet_addr *dst,
const union nf_inet_addr *src)
{
#ifdef CONFIG_IP_VS_IPV6
if (af == AF_INET6)
ipv6_addr_copy(&dst->in6, &src->in6);
else
#endif
dst->ip = src->ip;
}
static inline int ip_vs_addr_equal(int af, const union nf_inet_addr *a,
const union nf_inet_addr *b)
{
#ifdef CONFIG_IP_VS_IPV6
if (af == AF_INET6)
return ipv6_addr_equal(&a->in6, &b->in6);
#endif
return a->ip == b->ip;
}
#ifdef CONFIG_IP_VS_DEBUG
#include <linux/net.h>
extern int ip_vs_get_debug_level(void);
static inline const char *ip_vs_dbg_addr(int af, char *buf, size_t buf_len,
const union nf_inet_addr *addr,
int *idx)
{
int len;
#ifdef CONFIG_IP_VS_IPV6
if (af == AF_INET6)
len = snprintf(&buf[*idx], buf_len - *idx, "[%pI6]",
&addr->in6) + 1;
else
#endif
len = snprintf(&buf[*idx], buf_len - *idx, "%pI4",
&addr->ip) + 1;
*idx += len;
BUG_ON(*idx > buf_len + 1);
return &buf[*idx - len];
}
#define IP_VS_DBG_BUF(level, msg, ...) \
do { \
char ip_vs_dbg_buf[160]; \
int ip_vs_dbg_idx = 0; \
if (level <= ip_vs_get_debug_level()) \
printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
} while (0)
#define IP_VS_ERR_BUF(msg...) \
do { \
char ip_vs_dbg_buf[160]; \
int ip_vs_dbg_idx = 0; \
pr_err(msg); \
} while (0)
/* Only use from within IP_VS_DBG_BUF() or IP_VS_ERR_BUF macros */
#define IP_VS_DBG_ADDR(af, addr) \
ip_vs_dbg_addr(af, ip_vs_dbg_buf, \
sizeof(ip_vs_dbg_buf), addr, \
&ip_vs_dbg_idx)
#define IP_VS_DBG(level, msg, ...) \
do { \
if (level <= ip_vs_get_debug_level()) \
printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
} while (0)
#define IP_VS_DBG_RL(msg, ...) \
do { \
if (net_ratelimit()) \
printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
} 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_BUF(level, msg...) do {} while (0)
#define IP_VS_ERR_BUF(msg...) do {} while (0)
#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_RL(msg, ...) \
do { \
if (net_ratelimit()) \
pr_err(msg, ##__VA_ARGS__); \
} while (0)
#ifdef CONFIG_IP_VS_DEBUG
#define EnterFunction(level) \
do { \
if (level <= ip_vs_get_debug_level()) \
printk(KERN_DEBUG \
pr_fmt("Enter: %s, %s line %i\n"), \
__func__, __FILE__, __LINE__); \
} while (0)
#define LeaveFunction(level) \
do { \
if (level <= ip_vs_get_debug_level()) \
printk(KERN_DEBUG \
pr_fmt("Leave: %s, %s line %i\n"), \
__func__, __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 cpu_to_be16(21)
#define FTPDATA cpu_to_be16(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 objects
*/
struct ip_vs_estimator {
struct list_head list;
u64 last_inbytes;
u64 last_outbytes;
u32 last_conns;
u32 last_inpkts;
u32 last_outpkts;
u32 cps;
u32 inpps;
u32 outpps;
u32 inbps;
u32 outbps;
};
struct ip_vs_stats {
struct ip_vs_stats_user ustats; /* statistics */
struct ip_vs_estimator est; /* estimator */
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)(int af, struct sk_buff *skb,
struct ip_vs_protocol *pp,
int *verdict, struct ip_vs_conn **cpp);
struct ip_vs_conn *
(*conn_in_get)(int af,
const struct sk_buff *skb,
struct ip_vs_protocol *pp,
const struct ip_vs_iphdr *iph,
unsigned int proto_off,
int inverse);
struct ip_vs_conn *
(*conn_out_get)(int af,
const struct sk_buff *skb,
struct ip_vs_protocol *pp,
const struct ip_vs_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)(int af, 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 */
u16 af; /* address family */
union nf_inet_addr caddr; /* client address */
union nf_inet_addr vaddr; /* virtual address */
union nf_inet_addr 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 */
};
/*
* Extended internal versions of struct ip_vs_service_user and
* ip_vs_dest_user for IPv6 support.
*
* We need these to conveniently pass around service and destination
* options, but unfortunately, we also need to keep the old definitions to
* maintain userspace backwards compatibility for the setsockopt interface.
*/
struct ip_vs_service_user_kern {
/* virtual service addresses */
u16 af;
u16 protocol;
union nf_inet_addr addr; /* virtual ip address */
u16 port;
u32 fwmark; /* firwall mark of service */
/* virtual service options */
char *sched_name;
unsigned flags; /* virtual service flags */
unsigned timeout; /* persistent timeout in sec */
u32 netmask; /* persistent netmask */
};
struct ip_vs_dest_user_kern {
/* destination server address */
union nf_inet_addr addr;
u16 port;
/* real server options */
unsigned conn_flags; /* connection flags */
int weight; /* destination weight */
/* thresholds for active connections */
u32 u_threshold; /* upper threshold */
u32 l_threshold; /* lower threshold */
};
/*
* 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 af; /* address family */
__u16 protocol; /* which protocol (TCP/UDP) */
union nf_inet_addr 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 */
u16 af; /* address family */
union nf_inet_addr 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) */
union nf_inet_addr 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), ARRAY_SIZE((t)))
#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
#define IP_VS_CONN_TAB_BITS CONFIG_IP_VS_TAB_BITS
#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 af, int protocol, const union nf_inet_addr *s_addr, __be16 s_port,
const union nf_inet_addr *d_addr, __be16 d_port);
extern struct ip_vs_conn *ip_vs_ct_in_get
(int af, int protocol, const union nf_inet_addr *s_addr, __be16 s_port,
const union nf_inet_addr *d_addr, __be16 d_port);
extern struct ip_vs_conn *ip_vs_conn_out_get
(int af, int protocol, const union nf_inet_addr *s_addr, __be16 s_port,
const union nf_inet_addr *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 af, int proto, const union nf_inet_addr *caddr, __be16 cport,
const union nf_inet_addr *vaddr, __be16 vport,
const union nf_inet_addr *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_BUF("request control DEL for uncontrolled: "
"%s:%d to %s:%d\n",
IP_VS_DBG_ADDR(cp->af, &cp->caddr),
ntohs(cp->cport),
IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
ntohs(cp->vport));
return;
}
IP_VS_DBG_BUF(7, "DELeting control for: "
"cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
IP_VS_DBG_ADDR(cp->af, &cp->caddr),
ntohs(cp->cport),
IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
ntohs(ctl_cp->cport));
cp->control = NULL;
if (atomic_read(&ctl_cp->n_control) == 0) {
IP_VS_ERR_BUF("BUG control DEL with n=0 : "
"%s:%d to %s:%d\n",
IP_VS_DBG_ADDR(cp->af, &cp->caddr),
ntohs(cp->cport),
IP_VS_DBG_ADDR(cp->af, &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_BUF("request control ADD for already controlled: "
"%s:%d to %s:%d\n",
IP_VS_DBG_ADDR(cp->af, &cp->caddr),
ntohs(cp->cport),
IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
ntohs(cp->vport));
ip_vs_control_del(cp);
}
IP_VS_DBG_BUF(7, "ADDing control for: "
"cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
IP_VS_DBG_ADDR(cp->af, &cp->caddr),
ntohs(cp->cport),
IP_VS_DBG_ADDR(cp->af, &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, const char *const *names,
const 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 const struct ctl_path net_vs_ctl_path[];
extern struct ip_vs_service *
ip_vs_service_get(int af, __u32 fwmark, __u16 protocol,
const union nf_inet_addr *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(int af, __u16 protocol,
const union nf_inet_addr *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(int af, const union nf_inet_addr *daddr, __be16 dport,
const union nf_inet_addr *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_estimator_init(void);
extern void ip_vs_estimator_cleanup(void);
extern void 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);
#ifdef CONFIG_IP_VS_IPV6
extern int ip_vs_bypass_xmit_v6
(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
extern int ip_vs_nat_xmit_v6
(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
extern int ip_vs_tunnel_xmit_v6
(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
extern int ip_vs_dr_xmit_v6
(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
extern int ip_vs_icmp_xmit_v6
(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp,
int offset);
#endif
/*
* 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);
#ifdef CONFIG_IP_VS_IPV6
extern void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp,
struct ip_vs_conn *cp, int dir);
#endif
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(diff, sizeof(diff), oldsum);
}
#ifdef CONFIG_IP_VS_IPV6
static inline __wsum ip_vs_check_diff16(const __be32 *old, const __be32 *new,
__wsum oldsum)
{
__be32 diff[8] = { ~old[3], ~old[2], ~old[1], ~old[0],
new[3], new[2], new[1], new[0] };
return csum_partial(diff, sizeof(diff), oldsum);
}
#endif
static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum)
{
__be16 diff[2] = { ~old, new };
return csum_partial(diff, sizeof(diff), oldsum);
}
#endif /* __KERNEL__ */
#endif /* _NET_IP_VS_H */