linux/include/net/ip_vs.h
Marco Angaroni 3ec10d3a2b ipvs: update real-server binding of outgoing connections in SIP-pe
Previous patch that introduced handling of outgoing packets in SIP
persistent-engine did not call ip_vs_check_template() in case packet was
matching a connection template. Assumption was that real-server was
healthy, since it was sending a packet just in that moment.

There are however real-server fault conditions requiring that association
between call-id and real-server (represented by connection template)
gets updated. Here is an example of the sequence of events:
  1) RS1 is a back2back user agent that handled call-id1 and call-id2
  2) RS1 is down and was marked as unavailable
  3) new message from outside comes to IPVS with call-id1
  4) IPVS reschedules the message to RS2, which becomes new call handler
  5) RS2 forwards the message outside, translating call-id1 to call-id2
  6) inside pe->conn_out() IPVS matches call-id2 with existing template
  7) IPVS does not change association call-id2 <-> RS1
  8) new message comes from client with call-id2
  9) IPVS reschedules the message to a real-server potentially different
     from RS2, which is now the correct destination

This patch introduces ip_vs_check_template() call in the handling of
outgoing packets for SIP-pe. And also introduces a second optional
argument for ip_vs_check_template() that allows to check if dest
associated to a connection template is the same dest that was identified
as the source of the packet. This is to change the real-server bound to a
particular call-id independently from its availability status: the idea
is that it's more reliable, for in->out direction (where internal
network can be considered trusted), to always associate a call-id with
the last real-server that used it in one of its messages. Think about
above sequence of events where, just after step 5, RS1 returns instead
to be available.

Comparison of dests is done by simply comparing pointers to struct
ip_vs_dest; there should be no cases where struct ip_vs_dest keeps its
memory address, but represent a different real-server in terms of
ip-address / port.

Fixes: 39b9722315 ("ipvs: handle connections started by real-servers")
Signed-off-by: Marco Angaroni <marcoangaroni@gmail.com>
Acked-by: Julian Anastasov <ja@ssi.bg>
Signed-off-by: Simon Horman <horms@verge.net.au>
2016-06-06 09:47:25 +09:00

1639 lines
47 KiB
C

/* 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/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_IP_VS_IPV6)
#include <linux/netfilter_ipv6/ip6_tables.h>
#endif
#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;
}
/* This one needed for single_open_net since net is stored directly in
* private not as a struct i.e. seq_file_net can't be used.
*/
static inline struct net *seq_file_single_net(struct seq_file *seq)
{
#ifdef CONFIG_NET_NS
return (struct net *)seq->private;
#else
return &init_net;
#endif
}
/* 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,
const struct ip_vs_iphdr *ipvsh)
{
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
};
/* 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);
int (*csum_check)(int af, struct sk_buff *skb,
struct ip_vs_protocol *pp);
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 */
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 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;
};
/*
* 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;
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 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);
/* 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);
/* 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 task_struct *master_thread;
struct delayed_work master_wakeup_work;
struct netns_ipvs *ipvs;
};
/* 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 */
/* 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
/* 1/rate drop and drop-entry variables */
struct delayed_work defense_work; /* Work handler */
int drop_rate;
int drop_counter;
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;
/* 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 task_struct **backup_threads;
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;
};
#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 ACCESS_ONCE(ipvs->sysctl_sync_threshold[1]);
}
static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
{
return ACCESS_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 ACCESS_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_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;
}
#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_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;
}
#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 atomic_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();
atomic_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(__u16 proto, int state);
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);
}
/* 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_net_cleanup(struct netns_ipvs *ipvs);
/* 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);
int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb);
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);
int ip_vs_set_state_timeout(int *table, int num, const char *const *names,
const char *name, int to);
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);
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)
{
atomic_inc(&dest->refcnt);
}
static inline void ip_vs_dest_put(struct ip_vs_dest *dest)
{
smp_mb__before_atomic();
atomic_dec(&dest->refcnt);
}
static inline void ip_vs_dest_put_and_free(struct ip_vs_dest *dest)
{
if (atomic_dec_return(&dest->refcnt) < 0)
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
/* 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_ct_is_untracked(ct)) {
nf_conntrack_put(skb->nfct);
skb->nfct = &nf_ct_untracked_get()->ct_general;
skb->nfctinfo = IP_CT_NEW;
nf_conntrack_get(skb->nfct);
}
#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 */
/* Really using conntrack? */
static inline bool ip_vs_conn_uses_conntrack(struct ip_vs_conn *cp,
struct sk_buff *skb)
{
#ifdef CONFIG_IP_VS_NFCT
enum ip_conntrack_info ctinfo;
struct nf_conn *ct;
if (!(cp->flags & IP_VS_CONN_F_NFCT))
return false;
ct = nf_ct_get(skb, &ctinfo);
if (ct && !nf_ct_is_untracked(ct))
return true;
#endif
return false;
}
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);
}
#endif /* _NET_IP_VS_H */