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WSL2-Linux-Kernel
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WSL2-Linux-Kernel/include/net/ip_vs.h

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/* SPDX-License-Identifier: GPL-2.0 */
/* 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 */
#include <asm/types.h> /* for __uXX types */
#include <linux/list.h> /* for struct list_head */
#include <linux/spinlock.h> /* for struct rwlock_t */
#include <linux/atomic.h> /* for struct atomic_t */
#include <linux/refcount.h> /* for struct refcount_t */
#include <linux/workqueue.h>
#include <linux/compiler.h>
#include <linux/timer.h>
#include <linux/bug.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>
#if IS_ENABLED(CONFIG_NF_CONNTRACK)
#include <net/netfilter/nf_conntrack.h>
#endif
#include <net/net_namespace.h> /* Netw namespace */
#define IP_VS_HDR_INVERSE 1
#define IP_VS_HDR_ICMP 2
/* Generic access of ipvs struct */
static inline struct netns_ipvs *net_ipvs(struct net* net)
{
return net->ipvs;
}
/* Connections' size value needed by ip_vs_ctl.c */
extern int ip_vs_conn_tab_size;
struct ip_vs_iphdr {
int hdr_flags; /* ipvs flags */
__u32 off; /* Where IP or IPv4 header starts */
__u32 len; /* IPv4 simply where L4 starts
* IPv6 where L4 Transport Header starts */
__u16 fragoffs; /* IPv6 fragment offset, 0 if first frag (or not frag)*/
__s16 protocol;
__s32 flags;
union nf_inet_addr saddr;
union nf_inet_addr daddr;
};
static inline void *frag_safe_skb_hp(const struct sk_buff *skb, int offset,
int len, void *buffer)
{
return skb_header_pointer(skb, offset, len, buffer);
}
/* This function handles filling *ip_vs_iphdr, both for IPv4 and IPv6.
* IPv6 requires some extra work, as finding proper header position,
* depend on the IPv6 extension headers.
*/
static inline int
ip_vs_fill_iph_skb_off(int af, const struct sk_buff *skb, int offset,
int hdr_flags, struct ip_vs_iphdr *iphdr)
{
iphdr->hdr_flags = hdr_flags;
iphdr->off = offset;
#ifdef CONFIG_IP_VS_IPV6
if (af == AF_INET6) {
struct ipv6hdr _iph;
const struct ipv6hdr *iph = skb_header_pointer(
skb, offset, sizeof(_iph), &_iph);
if (!iph)
return 0;
iphdr->saddr.in6 = iph->saddr;
iphdr->daddr.in6 = iph->daddr;
/* ipv6_find_hdr() updates len, flags */
iphdr->len = offset;
iphdr->flags = 0;
iphdr->protocol = ipv6_find_hdr(skb, &iphdr->len, -1,
&iphdr->fragoffs,
&iphdr->flags);
if (iphdr->protocol < 0)
return 0;
} else
#endif
{
struct iphdr _iph;
const struct iphdr *iph = skb_header_pointer(
skb, offset, sizeof(_iph), &_iph);
if (!iph)
return 0;
iphdr->len = offset + iph->ihl * 4;
iphdr->fragoffs = 0;
iphdr->protocol = iph->protocol;
iphdr->saddr.ip = iph->saddr;
iphdr->daddr.ip = iph->daddr;
}
return 1;
}
static inline int
ip_vs_fill_iph_skb_icmp(int af, const struct sk_buff *skb, int offset,
bool inverse, struct ip_vs_iphdr *iphdr)
{
int hdr_flags = IP_VS_HDR_ICMP;
if (inverse)
hdr_flags |= IP_VS_HDR_INVERSE;
return ip_vs_fill_iph_skb_off(af, skb, offset, hdr_flags, iphdr);
}
static inline int
ip_vs_fill_iph_skb(int af, const struct sk_buff *skb, bool inverse,
struct ip_vs_iphdr *iphdr)
{
int hdr_flags = 0;
if (inverse)
hdr_flags |= IP_VS_HDR_INVERSE;
return ip_vs_fill_iph_skb_off(af, skb, skb_network_offset(skb),
hdr_flags, iphdr);
}
static inline bool
ip_vs_iph_inverse(const struct ip_vs_iphdr *iph)
{
return !!(iph->hdr_flags & IP_VS_HDR_INVERSE);
}
static inline bool
ip_vs_iph_icmp(const struct ip_vs_iphdr *iph)
{
return !!(iph->hdr_flags & IP_VS_HDR_ICMP);
}
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)
dst->in6 = src->in6;
else
#endif
dst->ip = src->ip;
}
static inline void ip_vs_addr_set(int af, union nf_inet_addr *dst,
const union nf_inet_addr *src)
{
#ifdef CONFIG_IP_VS_IPV6
if (af == AF_INET6) {
dst->in6 = src->in6;
return;
}
#endif
dst->ip = src->ip;
dst->all[1] = 0;
dst->all[2] = 0;
dst->all[3] = 0;
}
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>
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, "[%pI6c]",
&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, af, pp, skb, ofs, msg) \
do { \
if (level <= ip_vs_get_debug_level()) \
pp->debug_packet(af, pp, skb, ofs, msg); \
} while (0)
#define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) \
do { \
if (level <= ip_vs_get_debug_level() && \
net_ratelimit()) \
pp->debug_packet(af, 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, af, pp, skb, ofs, msg) do {} while (0)
#define IP_VS_DBG_RL_PKT(level, af, 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
/* 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,
};
/* SCTP State Values */
enum ip_vs_sctp_states {
IP_VS_SCTP_S_NONE,
IP_VS_SCTP_S_INIT1,
IP_VS_SCTP_S_INIT,
IP_VS_SCTP_S_COOKIE_SENT,
IP_VS_SCTP_S_COOKIE_REPLIED,
IP_VS_SCTP_S_COOKIE_WAIT,
IP_VS_SCTP_S_COOKIE,
IP_VS_SCTP_S_COOKIE_ECHOED,
IP_VS_SCTP_S_ESTABLISHED,
IP_VS_SCTP_S_SHUTDOWN_SENT,
IP_VS_SCTP_S_SHUTDOWN_RECEIVED,
IP_VS_SCTP_S_SHUTDOWN_ACK_SENT,
IP_VS_SCTP_S_REJECTED,
IP_VS_SCTP_S_CLOSED,
IP_VS_SCTP_S_LAST
};
/* Connection templates use bits from state */
#define IP_VS_CTPL_S_NONE 0x0000
#define IP_VS_CTPL_S_ASSURED 0x0001
#define IP_VS_CTPL_S_LAST 0x0002
/* 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 */
};
/* counters per cpu */
struct ip_vs_counters {
__u64 conns; /* connections scheduled */
__u64 inpkts; /* incoming packets */
__u64 outpkts; /* outgoing packets */
__u64 inbytes; /* incoming bytes */
__u64 outbytes; /* outgoing bytes */
};
/* Stats per cpu */
struct ip_vs_cpu_stats {
struct ip_vs_counters cnt;
struct u64_stats_sync syncp;
};
/* IPVS statistics objects */
struct ip_vs_estimator {
struct list_head list;
u64 last_inbytes;
u64 last_outbytes;
u64 last_conns;
u64 last_inpkts;
u64 last_outpkts;
u64 cps;
u64 inpps;
u64 outpps;
u64 inbps;
u64 outbps;
};
/*
* IPVS statistics object, 64-bit kernel version of struct ip_vs_stats_user
*/
struct ip_vs_kstats {
u64 conns; /* connections scheduled */
u64 inpkts; /* incoming packets */
u64 outpkts; /* outgoing packets */
u64 inbytes; /* incoming bytes */
u64 outbytes; /* outgoing bytes */
u64 cps; /* current connection rate */
u64 inpps; /* current in packet rate */
u64 outpps; /* current out packet rate */
u64 inbps; /* current in byte rate */
u64 outbps; /* current out byte rate */
};
struct ip_vs_stats {
struct ip_vs_kstats kstats; /* kernel statistics */
struct ip_vs_estimator est; /* estimator */
struct ip_vs_cpu_stats __percpu *cpustats; /* per cpu counters */
spinlock_t lock; /* spin lock */
struct ip_vs_kstats kstats0; /* reset values */
};
struct dst_entry;
struct iphdr;
struct ip_vs_conn;
struct ip_vs_app;
struct sk_buff;
struct ip_vs_proto_data;
struct ip_vs_protocol {
struct ip_vs_protocol *next;
char *name;
u16 protocol;
u16 num_states;
int dont_defrag;
void (*init)(struct ip_vs_protocol *pp);
void (*exit)(struct ip_vs_protocol *pp);
int (*init_netns)(struct netns_ipvs *ipvs, struct ip_vs_proto_data *pd);
void (*exit_netns)(struct netns_ipvs *ipvs, struct ip_vs_proto_data *pd);
int (*conn_schedule)(struct netns_ipvs *ipvs,
int af, struct sk_buff *skb,
struct ip_vs_proto_data *pd,
int *verdict, struct ip_vs_conn **cpp,
struct ip_vs_iphdr *iph);
struct ip_vs_conn *
(*conn_in_get)(struct netns_ipvs *ipvs,
int af,
const struct sk_buff *skb,
const struct ip_vs_iphdr *iph);
struct ip_vs_conn *
(*conn_out_get)(struct netns_ipvs *ipvs,
int af,
const struct sk_buff *skb,
const struct ip_vs_iphdr *iph);
int (*snat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp,
struct ip_vs_conn *cp, struct ip_vs_iphdr *iph);
int (*dnat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp,
struct ip_vs_conn *cp, struct ip_vs_iphdr *iph);
const char *(*state_name)(int state);
void (*state_transition)(struct ip_vs_conn *cp, int direction,
const struct sk_buff *skb,
struct ip_vs_proto_data *pd);
int (*register_app)(struct netns_ipvs *ipvs, struct ip_vs_app *inc);
void (*unregister_app)(struct netns_ipvs *ipvs, struct ip_vs_app *inc);
int (*app_conn_bind)(struct ip_vs_conn *cp);
void (*debug_packet)(int af, struct ip_vs_protocol *pp,
const struct sk_buff *skb,
int offset,
const char *msg);
void (*timeout_change)(struct ip_vs_proto_data *pd, int flags);
};
/* protocol data per netns */
struct ip_vs_proto_data {
struct ip_vs_proto_data *next;
struct ip_vs_protocol *pp;
int *timeout_table; /* protocol timeout table */
atomic_t appcnt; /* counter of proto app incs. */
struct tcp_states_t *tcp_state_table;
};
struct ip_vs_protocol *ip_vs_proto_get(unsigned short proto);
struct ip_vs_proto_data *ip_vs_proto_data_get(struct netns_ipvs *ipvs,
unsigned short proto);
struct ip_vs_conn_param {
struct netns_ipvs *ipvs;
const union nf_inet_addr *caddr;
const union nf_inet_addr *vaddr;
__be16 cport;
__be16 vport;
__u16 protocol;
u16 af;
const struct ip_vs_pe *pe;
char *pe_data;
__u8 pe_data_len;
};
/* IP_VS structure allocated for each dynamically scheduled connection */
struct ip_vs_conn {
struct hlist_node c_list; /* hashed list heads */
/* Protocol, addresses and port numbers */
__be16 cport;
__be16 dport;
__be16 vport;
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 */
volatile __u32 flags; /* status flags */
__u16 protocol; /* Which protocol (TCP/UDP) */
__u16 daf; /* Address family of the dest */
struct netns_ipvs *ipvs;
/* counter and timer */
refcount_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 state; /* state info */
volatile __u16 old_state; /* old state, to be used for
* state transition triggerd
* synchronization
*/
__u32 fwmark; /* Fire wall mark from skb */
unsigned long sync_endtime; /* jiffies + sent_retries */
/* 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 **.
* NF_ACCEPT can be returned when destination is local.
*/
int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp,
struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
/* 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 */
const struct ip_vs_pe *pe;
char *pe_data;
__u8 pe_data_len;
struct rcu_head rcu_head;
};
/* 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 */
__be16 port;
u32 fwmark; /* firwall mark of service */
/* virtual service options */
char *sched_name;
char *pe_name;
unsigned int flags; /* virtual service flags */
unsigned int timeout; /* persistent timeout in sec */
__be32 netmask; /* persistent netmask or plen */
};
struct ip_vs_dest_user_kern {
/* destination server address */
union nf_inet_addr addr;
__be16 port;
/* real server options */
unsigned int conn_flags; /* connection flags */
int weight; /* destination weight */
/* thresholds for active connections */
u32 u_threshold; /* upper threshold */
u32 l_threshold; /* lower threshold */
/* Address family of addr */
u16 af;
u16 tun_type; /* tunnel type */
__be16 tun_port; /* tunnel port */
u16 tun_flags; /* tunnel flags */
};
/*
* The information about the virtual service offered to the net and the
* forwarding entries.
*/
struct ip_vs_service {
struct hlist_node s_list; /* for normal service table */
struct hlist_node f_list; /* for fwmark-based service table */
atomic_t refcnt; /* reference 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 int flags; /* service status flags */
unsigned int timeout; /* persistent timeout in ticks */
__be32 netmask; /* grouping granularity, mask/plen */
struct netns_ipvs *ipvs;
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 __rcu *scheduler; /* bound scheduler object */
spinlock_t sched_lock; /* lock sched_data */
void *sched_data; /* scheduler application data */
/* alternate persistence engine */
struct ip_vs_pe __rcu *pe;
int conntrack_afmask;
struct rcu_head rcu_head;
};
/* Information for cached dst */
struct ip_vs_dest_dst {
struct dst_entry *dst_cache; /* destination cache entry */
u32 dst_cookie;
union nf_inet_addr dst_saddr;
struct rcu_head rcu_head;
};
/* 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 hlist_node d_list; /* for table with all the dests */
u16 af; /* address family */
__be16 port; /* port number of the server */
union nf_inet_addr addr; /* IP address of the server */
volatile unsigned int flags; /* dest status flags */
atomic_t conn_flags; /* flags to copy to conn */
atomic_t weight; /* server weight */
atomic_t last_weight; /* server latest weight */
__u16 tun_type; /* tunnel type */
__be16 tun_port; /* tunnel port */
__u16 tun_flags; /* tunnel flags */
refcount_t refcnt; /* reference counter */
struct ip_vs_stats stats; /* statistics */
unsigned long idle_start; /* start time, jiffies */
/* 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 ip_vs_dest_dst __rcu *dest_dst; /* cached dst info */
/* for virtual service */
struct ip_vs_service __rcu *svc; /* service it belongs to */
__u16 protocol; /* which protocol (TCP/UDP) */
__be16 vport; /* virtual port number */
union nf_inet_addr vaddr; /* virtual IP address */
__u32 vfwmark; /* firewall mark of service */
struct list_head t_list; /* in dest_trash */
unsigned int in_rs_table:1; /* we are in rs_table */
};
/* 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 */
void (*done_service)(struct ip_vs_service *svc);
/* dest is linked */
int (*add_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
/* dest is unlinked */
int (*del_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
/* dest is updated */
int (*upd_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
/* selecting a server from the given service */
struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc,
const struct sk_buff *skb,
struct ip_vs_iphdr *iph);
};
/* The persistence engine object */
struct ip_vs_pe {
struct list_head n_list; /* d-linked list head */
char *name; /* scheduler name */
atomic_t refcnt; /* reference counter */
struct module *module; /* THIS_MODULE/NULL */
/* get the connection template, if any */
int (*fill_param)(struct ip_vs_conn_param *p, struct sk_buff *skb);
bool (*ct_match)(const struct ip_vs_conn_param *p,
struct ip_vs_conn *ct);
u32 (*hashkey_raw)(const struct ip_vs_conn_param *p, u32 initval,
bool inverse);
int (*show_pe_data)(const struct ip_vs_conn *cp, char *buf);
/* create connections for real-server outgoing packets */
struct ip_vs_conn* (*conn_out)(struct ip_vs_service *svc,
struct ip_vs_dest *dest,
struct sk_buff *skb,
const struct ip_vs_iphdr *iph,
__be16 dport, __be16 cport);
};
/* 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 */
struct rcu_head rcu_head;
/* output hook: Process packet in inout direction, diff set for TCP.
* Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
* 2=Mangled but checksum was not updated
*/
int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *,
struct sk_buff *, int *diff, struct ip_vs_iphdr *ipvsh);
/* input hook: Process packet in outin direction, diff set for TCP.
* Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
* 2=Mangled but checksum was not updated
*/
int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *,
struct sk_buff *, int *diff, struct ip_vs_iphdr *ipvsh);
/* 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, int inverse);
struct ip_vs_conn *
(*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app,
const struct iphdr *iph, 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);
};
struct ipvs_master_sync_state {
struct list_head sync_queue;
struct ip_vs_sync_buff *sync_buff;
unsigned long sync_queue_len;
unsigned int sync_queue_delay;
struct delayed_work master_wakeup_work;
struct netns_ipvs *ipvs;
};
struct ip_vs_sync_thread_data;
/* How much time to keep dests in trash */
#define IP_VS_DEST_TRASH_PERIOD (120 * HZ)
struct ipvs_sync_daemon_cfg {
union nf_inet_addr mcast_group;
int syncid;
u16 sync_maxlen;
u16 mcast_port;
u8 mcast_af;
u8 mcast_ttl;
/* multicast interface name */
char mcast_ifn[IP_VS_IFNAME_MAXLEN];
};
/* IPVS in network namespace */
struct netns_ipvs {
int gen; /* Generation */
int enable; /* enable like nf_hooks do */
/* Hash table: for real service lookups */
#define IP_VS_RTAB_BITS 4
#define IP_VS_RTAB_SIZE (1 << IP_VS_RTAB_BITS)
#define IP_VS_RTAB_MASK (IP_VS_RTAB_SIZE - 1)
struct hlist_head rs_table[IP_VS_RTAB_SIZE];
/* ip_vs_app */
struct list_head app_list;
/* ip_vs_proto */
#define IP_VS_PROTO_TAB_SIZE 32 /* must be power of 2 */
struct ip_vs_proto_data *proto_data_table[IP_VS_PROTO_TAB_SIZE];
/* ip_vs_proto_tcp */
#ifdef CONFIG_IP_VS_PROTO_TCP
#define TCP_APP_TAB_BITS 4
#define TCP_APP_TAB_SIZE (1 << TCP_APP_TAB_BITS)
#define TCP_APP_TAB_MASK (TCP_APP_TAB_SIZE - 1)
struct list_head tcp_apps[TCP_APP_TAB_SIZE];
#endif
/* ip_vs_proto_udp */
#ifdef CONFIG_IP_VS_PROTO_UDP
#define UDP_APP_TAB_BITS 4
#define UDP_APP_TAB_SIZE (1 << UDP_APP_TAB_BITS)
#define UDP_APP_TAB_MASK (UDP_APP_TAB_SIZE - 1)
struct list_head udp_apps[UDP_APP_TAB_SIZE];
#endif
/* ip_vs_proto_sctp */
#ifdef CONFIG_IP_VS_PROTO_SCTP
#define SCTP_APP_TAB_BITS 4
#define SCTP_APP_TAB_SIZE (1 << SCTP_APP_TAB_BITS)
#define SCTP_APP_TAB_MASK (SCTP_APP_TAB_SIZE - 1)
/* Hash table for SCTP application incarnations */
struct list_head sctp_apps[SCTP_APP_TAB_SIZE];
#endif
/* ip_vs_conn */
atomic_t conn_count; /* connection counter */
/* ip_vs_ctl */
struct ip_vs_stats tot_stats; /* Statistics & est. */
int num_services; /* no of virtual services */
int num_services6; /* IPv6 virtual services */
/* Trash for destinations */
struct list_head dest_trash;
spinlock_t dest_trash_lock;
struct timer_list dest_trash_timer; /* expiration timer */
/* Service counters */
atomic_t ftpsvc_counter;
atomic_t nullsvc_counter;
atomic_t conn_out_counter;
#ifdef CONFIG_SYSCTL
/* delayed work for expiring no dest connections */
struct delayed_work expire_nodest_conn_work;
/* 1/rate drop and drop-entry variables */
struct delayed_work defense_work; /* Work handler */
int drop_rate;
int drop_counter;
int old_secure_tcp;
atomic_t dropentry;
/* locks in ctl.c */
spinlock_t dropentry_lock; /* drop entry handling */
spinlock_t droppacket_lock; /* drop packet handling */
spinlock_t securetcp_lock; /* state and timeout tables */
/* sys-ctl struct */
struct ctl_table_header *sysctl_hdr;
struct ctl_table *sysctl_tbl;
#endif
/* sysctl variables */
int sysctl_amemthresh;
int sysctl_am_droprate;
int sysctl_drop_entry;
int sysctl_drop_packet;
int sysctl_secure_tcp;
#ifdef CONFIG_IP_VS_NFCT
int sysctl_conntrack;
#endif
int sysctl_snat_reroute;
int sysctl_sync_ver;
int sysctl_sync_ports;
int sysctl_sync_persist_mode;
unsigned long sysctl_sync_qlen_max;
int sysctl_sync_sock_size;
int sysctl_cache_bypass;
int sysctl_expire_nodest_conn;
int sysctl_sloppy_tcp;
int sysctl_sloppy_sctp;
int sysctl_expire_quiescent_template;
int sysctl_sync_threshold[2];
unsigned int sysctl_sync_refresh_period;
int sysctl_sync_retries;
int sysctl_nat_icmp_send;
int sysctl_pmtu_disc;
int sysctl_backup_only;
int sysctl_conn_reuse_mode;
int sysctl_schedule_icmp;
int sysctl_ignore_tunneled;
int sysctl_run_estimation;
/* ip_vs_lblc */
int sysctl_lblc_expiration;
struct ctl_table_header *lblc_ctl_header;
struct ctl_table *lblc_ctl_table;
/* ip_vs_lblcr */
int sysctl_lblcr_expiration;
struct ctl_table_header *lblcr_ctl_header;
struct ctl_table *lblcr_ctl_table;
/* ip_vs_est */
struct list_head est_list; /* estimator list */
spinlock_t est_lock;
struct timer_list est_timer; /* Estimation timer */
/* ip_vs_sync */
spinlock_t sync_lock;
struct ipvs_master_sync_state *ms;
spinlock_t sync_buff_lock;
struct ip_vs_sync_thread_data *master_tinfo;
struct ip_vs_sync_thread_data *backup_tinfo;
int threads_mask;
volatile int sync_state;
struct mutex sync_mutex;
struct ipvs_sync_daemon_cfg mcfg; /* Master Configuration */
struct ipvs_sync_daemon_cfg bcfg; /* Backup Configuration */
/* net name space ptr */
struct net *net; /* Needed by timer routines */
/* Number of heterogeneous destinations, needed becaus heterogeneous
* are not supported when synchronization is enabled.
*/
unsigned int mixed_address_family_dests;
unsigned int hooks_afmask; /* &1=AF_INET, &2=AF_INET6 */
};
#define DEFAULT_SYNC_THRESHOLD 3
#define DEFAULT_SYNC_PERIOD 50
#define DEFAULT_SYNC_VER 1
#define DEFAULT_SLOPPY_TCP 0
#define DEFAULT_SLOPPY_SCTP 0
#define DEFAULT_SYNC_REFRESH_PERIOD (0U * HZ)
#define DEFAULT_SYNC_RETRIES 0
#define IPVS_SYNC_WAKEUP_RATE 8
#define IPVS_SYNC_QLEN_MAX (IPVS_SYNC_WAKEUP_RATE * 4)
#define IPVS_SYNC_SEND_DELAY (HZ / 50)
#define IPVS_SYNC_CHECK_PERIOD HZ
#define IPVS_SYNC_FLUSH_TIME (HZ * 2)
#define IPVS_SYNC_PORTS_MAX (1 << 6)
#ifdef CONFIG_SYSCTL
static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
{
return ipvs->sysctl_sync_threshold[0];
}
static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
{
return READ_ONCE(ipvs->sysctl_sync_threshold[1]);
}
static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
{
return READ_ONCE(ipvs->sysctl_sync_refresh_period);
}
static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
{
return ipvs->sysctl_sync_retries;
}
static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
{
return ipvs->sysctl_sync_ver;
}
static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs)
{
return ipvs->sysctl_sloppy_tcp;
}
static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs)
{
return ipvs->sysctl_sloppy_sctp;
}
static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
{
return READ_ONCE(ipvs->sysctl_sync_ports);
}
static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs)
{
return ipvs->sysctl_sync_persist_mode;
}
static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
{
return ipvs->sysctl_sync_qlen_max;
}
static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
{
return ipvs->sysctl_sync_sock_size;
}
static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
{
return ipvs->sysctl_pmtu_disc;
}
static inline int sysctl_backup_only(struct netns_ipvs *ipvs)
{
return ipvs->sync_state & IP_VS_STATE_BACKUP &&
ipvs->sysctl_backup_only;
}
static inline int sysctl_conn_reuse_mode(struct netns_ipvs *ipvs)
{
return ipvs->sysctl_conn_reuse_mode;
}
static inline int sysctl_expire_nodest_conn(struct netns_ipvs *ipvs)
{
return ipvs->sysctl_expire_nodest_conn;
}
static inline int sysctl_schedule_icmp(struct netns_ipvs *ipvs)
{
return ipvs->sysctl_schedule_icmp;
}
static inline int sysctl_ignore_tunneled(struct netns_ipvs *ipvs)
{
return ipvs->sysctl_ignore_tunneled;
}
static inline int sysctl_cache_bypass(struct netns_ipvs *ipvs)
{
return ipvs->sysctl_cache_bypass;
}
static inline int sysctl_run_estimation(struct netns_ipvs *ipvs)
{
return ipvs->sysctl_run_estimation;
}
#else
static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
{
return DEFAULT_SYNC_THRESHOLD;
}
static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
{
return DEFAULT_SYNC_PERIOD;
}
static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
{
return DEFAULT_SYNC_REFRESH_PERIOD;
}
static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
{
return DEFAULT_SYNC_RETRIES & 3;
}
static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
{
return DEFAULT_SYNC_VER;
}
static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs)
{
return DEFAULT_SLOPPY_TCP;
}
static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs)
{
return DEFAULT_SLOPPY_SCTP;
}
static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
{
return 1;
}
static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs)
{
return 0;
}
static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
{
return IPVS_SYNC_QLEN_MAX;
}
static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
{
return 0;
}
static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
{
return 1;
}
static inline int sysctl_backup_only(struct netns_ipvs *ipvs)
{
return 0;
}
static inline int sysctl_conn_reuse_mode(struct netns_ipvs *ipvs)
{
return 1;
}
static inline int sysctl_expire_nodest_conn(struct netns_ipvs *ipvs)
{
return 0;
}
static inline int sysctl_schedule_icmp(struct netns_ipvs *ipvs)
{
return 0;
}
static inline int sysctl_ignore_tunneled(struct netns_ipvs *ipvs)
{
return 0;
}
static inline int sysctl_cache_bypass(struct netns_ipvs *ipvs)
{
return 0;
}
static inline int sysctl_run_estimation(struct netns_ipvs *ipvs)
{
return 1;
}
#endif
/* IPVS core functions
* (from ip_vs_core.c)
*/
const char *ip_vs_proto_name(unsigned int proto);
void ip_vs_init_hash_table(struct list_head *table, int rows);
struct ip_vs_conn *ip_vs_new_conn_out(struct ip_vs_service *svc,
struct ip_vs_dest *dest,
struct sk_buff *skb,
const struct ip_vs_iphdr *iph,
__be16 dport,
__be16 cport);
#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)
*/
enum {
IP_VS_DIR_INPUT = 0,
IP_VS_DIR_OUTPUT,
IP_VS_DIR_INPUT_ONLY,
IP_VS_DIR_LAST,
};
static inline void ip_vs_conn_fill_param(struct netns_ipvs *ipvs, int af, int protocol,
const union nf_inet_addr *caddr,
__be16 cport,
const union nf_inet_addr *vaddr,
__be16 vport,
struct ip_vs_conn_param *p)
{
p->ipvs = ipvs;
p->af = af;
p->protocol = protocol;
p->caddr = caddr;
p->cport = cport;
p->vaddr = vaddr;
p->vport = vport;
p->pe = NULL;
p->pe_data = NULL;
}
struct ip_vs_conn *ip_vs_conn_in_get(const struct ip_vs_conn_param *p);
struct ip_vs_conn *ip_vs_ct_in_get(const struct ip_vs_conn_param *p);
struct ip_vs_conn * ip_vs_conn_in_get_proto(struct netns_ipvs *ipvs, int af,
const struct sk_buff *skb,
const struct ip_vs_iphdr *iph);
struct ip_vs_conn *ip_vs_conn_out_get(const struct ip_vs_conn_param *p);
struct ip_vs_conn * ip_vs_conn_out_get_proto(struct netns_ipvs *ipvs, int af,
const struct sk_buff *skb,
const struct ip_vs_iphdr *iph);
/* Get reference to gain full access to conn.
* By default, RCU read-side critical sections have access only to
* conn fields and its PE data, see ip_vs_conn_rcu_free() for reference.
*/
static inline bool __ip_vs_conn_get(struct ip_vs_conn *cp)
{
return refcount_inc_not_zero(&cp->refcnt);
}
/* put back the conn without restarting its timer */
static inline void __ip_vs_conn_put(struct ip_vs_conn *cp)
{
smp_mb__before_atomic();
refcount_dec(&cp->refcnt);
}
void ip_vs_conn_put(struct ip_vs_conn *cp);
void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport);
struct ip_vs_conn *ip_vs_conn_new(const struct ip_vs_conn_param *p, int dest_af,
const union nf_inet_addr *daddr,
__be16 dport, unsigned int flags,
struct ip_vs_dest *dest, __u32 fwmark);
void ip_vs_conn_expire_now(struct ip_vs_conn *cp);
const char *ip_vs_state_name(const struct ip_vs_conn *cp);
void ip_vs_tcp_conn_listen(struct ip_vs_conn *cp);
int ip_vs_check_template(struct ip_vs_conn *ct, struct ip_vs_dest *cdest);
void ip_vs_random_dropentry(struct netns_ipvs *ipvs);
int ip_vs_conn_init(void);
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);
}
/* Mark our template as assured */
static inline void
ip_vs_control_assure_ct(struct ip_vs_conn *cp)
{
struct ip_vs_conn *ct = cp->control;
if (ct && !(ct->state & IP_VS_CTPL_S_ASSURED) &&
(ct->flags & IP_VS_CONN_F_TEMPLATE))
ct->state |= IP_VS_CTPL_S_ASSURED;
}
/* IPVS netns init & cleanup functions */
int ip_vs_estimator_net_init(struct netns_ipvs *ipvs);
int ip_vs_control_net_init(struct netns_ipvs *ipvs);
int ip_vs_protocol_net_init(struct netns_ipvs *ipvs);
int ip_vs_app_net_init(struct netns_ipvs *ipvs);
int ip_vs_conn_net_init(struct netns_ipvs *ipvs);
int ip_vs_sync_net_init(struct netns_ipvs *ipvs);
void ip_vs_conn_net_cleanup(struct netns_ipvs *ipvs);
void ip_vs_app_net_cleanup(struct netns_ipvs *ipvs);
void ip_vs_protocol_net_cleanup(struct netns_ipvs *ipvs);
void ip_vs_control_net_cleanup(struct netns_ipvs *ipvs);
void ip_vs_estimator_net_cleanup(struct netns_ipvs *ipvs);
void ip_vs_sync_net_cleanup(struct netns_ipvs *ipvs);
void ip_vs_service_nets_cleanup(struct list_head *net_list);
/* IPVS application functions
* (from ip_vs_app.c)
*/
#define IP_VS_APP_MAX_PORTS 8
struct ip_vs_app *register_ip_vs_app(struct netns_ipvs *ipvs, struct ip_vs_app *app);
void unregister_ip_vs_app(struct netns_ipvs *ipvs, struct ip_vs_app *app);
int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
void ip_vs_unbind_app(struct ip_vs_conn *cp);
int register_ip_vs_app_inc(struct netns_ipvs *ipvs, struct ip_vs_app *app, __u16 proto,
__u16 port);
int ip_vs_app_inc_get(struct ip_vs_app *inc);
void ip_vs_app_inc_put(struct ip_vs_app *inc);
int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb,
struct ip_vs_iphdr *ipvsh);
int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb,
struct ip_vs_iphdr *ipvsh);
int register_ip_vs_pe(struct ip_vs_pe *pe);
int unregister_ip_vs_pe(struct ip_vs_pe *pe);
struct ip_vs_pe *ip_vs_pe_getbyname(const char *name);
struct ip_vs_pe *__ip_vs_pe_getbyname(const char *pe_name);
/* Use a #define to avoid all of module.h just for these trivial ops */
#define ip_vs_pe_get(pe) \
if (pe && pe->module) \
__module_get(pe->module);
#define ip_vs_pe_put(pe) \
if (pe && pe->module) \
module_put(pe->module);
/* IPVS protocol functions (from ip_vs_proto.c) */
int ip_vs_protocol_init(void);
void ip_vs_protocol_cleanup(void);
void ip_vs_protocol_timeout_change(struct netns_ipvs *ipvs, int flags);
int *ip_vs_create_timeout_table(int *table, int size);
void ip_vs_tcpudp_debug_packet(int af, 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;
extern struct ip_vs_protocol ip_vs_protocol_sctp;
/* Registering/unregistering scheduler functions
* (from ip_vs_sched.c)
*/
int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
int ip_vs_bind_scheduler(struct ip_vs_service *svc,
struct ip_vs_scheduler *scheduler);
void ip_vs_unbind_scheduler(struct ip_vs_service *svc,
struct ip_vs_scheduler *sched);
struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name);
void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler);
struct ip_vs_conn *
ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb,
struct ip_vs_proto_data *pd, int *ignored,
struct ip_vs_iphdr *iph);
int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
struct ip_vs_proto_data *pd, struct ip_vs_iphdr *iph);
void ip_vs_scheduler_err(struct ip_vs_service *svc, const char *msg);
/* IPVS control data and functions (from ip_vs_ctl.c) */
extern struct ip_vs_stats ip_vs_stats;
extern int sysctl_ip_vs_sync_ver;
struct ip_vs_service *
ip_vs_service_find(struct netns_ipvs *ipvs, int af, __u32 fwmark, __u16 protocol,
const union nf_inet_addr *vaddr, __be16 vport);
bool ip_vs_has_real_service(struct netns_ipvs *ipvs, int af, __u16 protocol,
const union nf_inet_addr *daddr, __be16 dport);
struct ip_vs_dest *
ip_vs_find_real_service(struct netns_ipvs *ipvs, int af, __u16 protocol,
const union nf_inet_addr *daddr, __be16 dport);
struct ip_vs_dest *ip_vs_find_tunnel(struct netns_ipvs *ipvs, int af,
const union nf_inet_addr *daddr,
__be16 tun_port);
int ip_vs_use_count_inc(void);
void ip_vs_use_count_dec(void);
int ip_vs_register_nl_ioctl(void);
void ip_vs_unregister_nl_ioctl(void);
int ip_vs_control_init(void);
void ip_vs_control_cleanup(void);
struct ip_vs_dest *
ip_vs_find_dest(struct netns_ipvs *ipvs, int svc_af, int dest_af,
const union nf_inet_addr *daddr, __be16 dport,
const union nf_inet_addr *vaddr, __be16 vport,
__u16 protocol, __u32 fwmark, __u32 flags);
void ip_vs_try_bind_dest(struct ip_vs_conn *cp);
static inline void ip_vs_dest_hold(struct ip_vs_dest *dest)
{
refcount_inc(&dest->refcnt);
}
static inline void ip_vs_dest_put(struct ip_vs_dest *dest)
{
smp_mb__before_atomic();
refcount_dec(&dest->refcnt);
}
static inline void ip_vs_dest_put_and_free(struct ip_vs_dest *dest)
{
if (refcount_dec_and_test(&dest->refcnt))
kfree(dest);
}
/* IPVS sync daemon data and function prototypes
* (from ip_vs_sync.c)
*/
int start_sync_thread(struct netns_ipvs *ipvs, struct ipvs_sync_daemon_cfg *cfg,
int state);
int stop_sync_thread(struct netns_ipvs *ipvs, int state);
void ip_vs_sync_conn(struct netns_ipvs *ipvs, struct ip_vs_conn *cp, int pkts);
/* IPVS rate estimator prototypes (from ip_vs_est.c) */
void ip_vs_start_estimator(struct netns_ipvs *ipvs, struct ip_vs_stats *stats);
void ip_vs_stop_estimator(struct netns_ipvs *ipvs, struct ip_vs_stats *stats);
void ip_vs_zero_estimator(struct ip_vs_stats *stats);
void ip_vs_read_estimator(struct ip_vs_kstats *dst, struct ip_vs_stats *stats);
/* Various IPVS packet transmitters (from ip_vs_xmit.c) */
int ip_vs_null_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
int ip_vs_bypass_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
int ip_vs_nat_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
int ip_vs_tunnel_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
int ip_vs_dr_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
int ip_vs_icmp_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
struct ip_vs_protocol *pp, int offset,
unsigned int hooknum, struct ip_vs_iphdr *iph);
void ip_vs_dest_dst_rcu_free(struct rcu_head *head);
#ifdef CONFIG_IP_VS_IPV6
int ip_vs_bypass_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
int ip_vs_nat_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
int ip_vs_tunnel_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
int ip_vs_dr_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
int ip_vs_icmp_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
struct ip_vs_protocol *pp, int offset,
unsigned int hooknum, struct ip_vs_iphdr *iph);
#endif
#ifdef CONFIG_SYSCTL
/* 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
*/
static inline int ip_vs_todrop(struct netns_ipvs *ipvs)
{
if (!ipvs->drop_rate)
return 0;
if (--ipvs->drop_counter > 0)
return 0;
ipvs->drop_counter = ipvs->drop_rate;
return 1;
}
#else
static inline int ip_vs_todrop(struct netns_ipvs *ipvs) { return 0; }
#endif
#ifdef CONFIG_SYSCTL
/* Enqueue delayed work for expiring no dest connections
* Only run when sysctl_expire_nodest=1
*/
static inline void ip_vs_enqueue_expire_nodest_conns(struct netns_ipvs *ipvs)
{
if (sysctl_expire_nodest_conn(ipvs))
queue_delayed_work(system_long_wq,
&ipvs->expire_nodest_conn_work, 1);
}
void ip_vs_expire_nodest_conn_flush(struct netns_ipvs *ipvs);
#else
static inline void ip_vs_enqueue_expire_nodest_conns(struct netns_ipvs *ipvs) {}
#endif
#define IP_VS_DFWD_METHOD(dest) (atomic_read(&(dest)->conn_flags) & \
IP_VS_CONN_F_FWD_MASK)
/* 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;
}
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
void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp,
struct ip_vs_conn *cp, int dir);
#endif
__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);
}
/* Forget current conntrack (unconfirmed) and attach notrack entry */
static inline void ip_vs_notrack(struct sk_buff *skb)
{
#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
enum ip_conntrack_info ctinfo;
struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
if (ct) {
nf_conntrack_put(&ct->ct_general);
nf_ct_set(skb, NULL, IP_CT_UNTRACKED);
}
#endif
}
#ifdef CONFIG_IP_VS_NFCT
/* Netfilter connection tracking
* (from ip_vs_nfct.c)
*/
static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
{
#ifdef CONFIG_SYSCTL
return ipvs->sysctl_conntrack;
#else
return 0;
#endif
}
void ip_vs_update_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp,
int outin);
int ip_vs_confirm_conntrack(struct sk_buff *skb);
void ip_vs_nfct_expect_related(struct sk_buff *skb, struct nf_conn *ct,
struct ip_vs_conn *cp, u_int8_t proto,
const __be16 port, int from_rs);
void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp);
#else
static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
{
return 0;
}
static inline void ip_vs_update_conntrack(struct sk_buff *skb,
struct ip_vs_conn *cp, int outin)
{
}
static inline int ip_vs_confirm_conntrack(struct sk_buff *skb)
{
return NF_ACCEPT;
}
static inline void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp)
{
}
#endif /* CONFIG_IP_VS_NFCT */
/* Using old conntrack that can not be redirected to another real server? */
static inline bool ip_vs_conn_uses_old_conntrack(struct ip_vs_conn *cp,
struct sk_buff *skb)
{
#ifdef CONFIG_IP_VS_NFCT
enum ip_conntrack_info ctinfo;
struct nf_conn *ct;
ct = nf_ct_get(skb, &ctinfo);
if (ct && nf_ct_is_confirmed(ct))
return true;
#endif
return false;
}
static inline int ip_vs_register_conntrack(struct ip_vs_service *svc)
{
#if IS_ENABLED(CONFIG_NF_CONNTRACK)
int afmask = (svc->af == AF_INET6) ? 2 : 1;
int ret = 0;
if (!(svc->conntrack_afmask & afmask)) {
ret = nf_ct_netns_get(svc->ipvs->net, svc->af);
if (ret >= 0)
svc->conntrack_afmask |= afmask;
}
return ret;
#else
return 0;
#endif
}
static inline void ip_vs_unregister_conntrack(struct ip_vs_service *svc)
{
#if IS_ENABLED(CONFIG_NF_CONNTRACK)
int afmask = (svc->af == AF_INET6) ? 2 : 1;
if (svc->conntrack_afmask & afmask) {
nf_ct_netns_put(svc->ipvs->net, svc->af);
svc->conntrack_afmask &= ~afmask;
}
#endif
}
int ip_vs_register_hooks(struct netns_ipvs *ipvs, unsigned int af);
void ip_vs_unregister_hooks(struct netns_ipvs *ipvs, unsigned int af);
static inline int
ip_vs_dest_conn_overhead(struct ip_vs_dest *dest)
{
/* We think the overhead of processing active connections is 256
* times higher than that of inactive connections in average. (This
* 256 times might not be accurate, we will change it later) We
* use the following formula to estimate the overhead now:
* dest->activeconns*256 + dest->inactconns
*/
return (atomic_read(&dest->activeconns) << 8) +
atomic_read(&dest->inactconns);
}
#ifdef CONFIG_IP_VS_PROTO_TCP
INDIRECT_CALLABLE_DECLARE(int
tcp_snat_handler(struct sk_buff *skb, struct ip_vs_protocol *pp,
struct ip_vs_conn *cp, struct ip_vs_iphdr *iph));
#endif
#ifdef CONFIG_IP_VS_PROTO_UDP
INDIRECT_CALLABLE_DECLARE(int
udp_snat_handler(struct sk_buff *skb, struct ip_vs_protocol *pp,
struct ip_vs_conn *cp, struct ip_vs_iphdr *iph));
#endif
#endif /* _NET_IP_VS_H */
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