diff options
Diffstat (limited to 'include/net/ip_vs.h')
| -rw-r--r-- | include/net/ip_vs.h | 1432 |
1 files changed, 1432 insertions, 0 deletions
diff --git a/include/net/ip_vs.h b/include/net/ip_vs.h new file mode 100644 index 00000000..481f856c --- /dev/null +++ b/include/net/ip_vs.h @@ -0,0 +1,1432 @@ +/* + * 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/sysctl.h> /* for ctl_path */ +#include <linux/list.h> /* for struct list_head */ +#include <linux/spinlock.h> /* for struct rwlock_t */ +#include <asm/atomic.h> /* for struct atomic_t */ +#include <linux/compiler.h> +#include <linux/timer.h> + +#include <net/checksum.h> +#include <linux/netfilter.h> /* for union nf_inet_addr */ +#include <linux/ip.h> +#include <linux/ipv6.h> /* for struct ipv6hdr */ +#include <net/ipv6.h> /* for ipv6_addr_copy */ +#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) +#include <net/netfilter/nf_conntrack.h> +#endif +#include <net/net_namespace.h> /* Netw namespace */ + +/* + * Generic access of ipvs struct + */ +static inline struct netns_ipvs *net_ipvs(struct net* net) +{ + return net->ipvs; +} +/* + * Get net ptr from skb in traffic cases + * use skb_sknet when call is from userland (ioctl or netlink) + */ +static inline struct net *skb_net(const struct sk_buff *skb) +{ +#ifdef CONFIG_NET_NS +#ifdef CONFIG_IP_VS_DEBUG + /* + * This is used for debug only. + * Start with the most likely hit + * End with BUG + */ + if (likely(skb->dev && skb->dev->nd_net)) + return dev_net(skb->dev); + if (skb_dst(skb) && skb_dst(skb)->dev) + return dev_net(skb_dst(skb)->dev); + WARN(skb->sk, "Maybe skb_sknet should be used in %s() at line:%d\n", + __func__, __LINE__); + if (likely(skb->sk && skb->sk->sk_net)) + return sock_net(skb->sk); + pr_err("There is no net ptr to find in the skb in %s() line:%d\n", + __func__, __LINE__); + BUG(); +#else + return dev_net(skb->dev ? : skb_dst(skb)->dev); +#endif +#else + return &init_net; +#endif +} + +static inline struct net *skb_sknet(const struct sk_buff *skb) +{ +#ifdef CONFIG_NET_NS +#ifdef CONFIG_IP_VS_DEBUG + /* Start with the most likely hit */ + if (likely(skb->sk && skb->sk->sk_net)) + return sock_net(skb->sk); + WARN(skb->dev, "Maybe skb_net should be used instead in %s() line:%d\n", + __func__, __LINE__); + if (likely(skb->dev && skb->dev->nd_net)) + return dev_net(skb->dev); + pr_err("There is no net ptr to find in the skb in %s() line:%d\n", + __func__, __LINE__); + BUG(); +#else + return sock_net(skb->sk); +#endif +#else + return &init_net; +#endif +} +/* + * 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 len; + __u8 protocol; + union nf_inet_addr saddr; + union nf_inet_addr daddr; +}; + +static inline void +ip_vs_fill_iphdr(int af, const void *nh, struct ip_vs_iphdr *iphdr) +{ +#ifdef CONFIG_IP_VS_IPV6 + if (af == AF_INET6) { + const struct ipv6hdr *iph = nh; + iphdr->len = sizeof(struct ipv6hdr); + iphdr->protocol = iph->nexthdr; + ipv6_addr_copy(&iphdr->saddr.in6, &iph->saddr); + ipv6_addr_copy(&iphdr->daddr.in6, &iph->daddr); + } else +#endif + { + const struct iphdr *iph = nh; + iphdr->len = iph->ihl * 4; + iphdr->protocol = iph->protocol; + iphdr->saddr.ip = iph->saddr; + iphdr->daddr.ip = iph->daddr; + } +} + +static inline void ip_vs_addr_copy(int af, union nf_inet_addr *dst, + const union nf_inet_addr *src) +{ +#ifdef CONFIG_IP_VS_IPV6 + if (af == AF_INET6) + ipv6_addr_copy(&dst->in6, &src->in6); + else +#endif + dst->ip = src->ip; +} + +static inline int ip_vs_addr_equal(int af, const union nf_inet_addr *a, + const union nf_inet_addr *b) +{ +#ifdef CONFIG_IP_VS_IPV6 + if (af == AF_INET6) + return ipv6_addr_equal(&a->in6, &b->in6); +#endif + return a->ip == b->ip; +} + +#ifdef CONFIG_IP_VS_DEBUG +#include <linux/net.h> + +extern int ip_vs_get_debug_level(void); + +static inline const char *ip_vs_dbg_addr(int af, char *buf, size_t buf_len, + const union nf_inet_addr *addr, + int *idx) +{ + int len; +#ifdef CONFIG_IP_VS_IPV6 + if (af == AF_INET6) + len = snprintf(&buf[*idx], buf_len - *idx, "[%pI6]", + &addr->in6) + 1; + else +#endif + len = snprintf(&buf[*idx], buf_len - *idx, "%pI4", + &addr->ip) + 1; + + *idx += len; + BUG_ON(*idx > buf_len + 1); + return &buf[*idx - len]; +} + +#define IP_VS_DBG_BUF(level, msg, ...) \ + do { \ + char ip_vs_dbg_buf[160]; \ + int ip_vs_dbg_idx = 0; \ + if (level <= ip_vs_get_debug_level()) \ + printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \ + } while (0) +#define IP_VS_ERR_BUF(msg...) \ + do { \ + char ip_vs_dbg_buf[160]; \ + int ip_vs_dbg_idx = 0; \ + pr_err(msg); \ + } while (0) + +/* Only use from within IP_VS_DBG_BUF() or IP_VS_ERR_BUF macros */ +#define IP_VS_DBG_ADDR(af, addr) \ + ip_vs_dbg_addr(af, ip_vs_dbg_buf, \ + sizeof(ip_vs_dbg_buf), addr, \ + &ip_vs_dbg_idx) + +#define IP_VS_DBG(level, msg, ...) \ + do { \ + if (level <= ip_vs_get_debug_level()) \ + printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \ + } while (0) +#define IP_VS_DBG_RL(msg, ...) \ + do { \ + if (net_ratelimit()) \ + printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \ + } while (0) +#define IP_VS_DBG_PKT(level, 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 + +#define IP_VS_WAIT_WHILE(expr) while (expr) { cpu_relax(); } + + +/* + * The port number of FTP service (in network order). + */ +#define FTPPORT cpu_to_be16(21) +#define FTPDATA cpu_to_be16(20) + +/* + * TCP State Values + */ +enum { + IP_VS_TCP_S_NONE = 0, + IP_VS_TCP_S_ESTABLISHED, + IP_VS_TCP_S_SYN_SENT, + IP_VS_TCP_S_SYN_RECV, + IP_VS_TCP_S_FIN_WAIT, + IP_VS_TCP_S_TIME_WAIT, + IP_VS_TCP_S_CLOSE, + IP_VS_TCP_S_CLOSE_WAIT, + IP_VS_TCP_S_LAST_ACK, + IP_VS_TCP_S_LISTEN, + IP_VS_TCP_S_SYNACK, + IP_VS_TCP_S_LAST +}; + +/* + * UDP State Values + */ +enum { + IP_VS_UDP_S_NORMAL, + IP_VS_UDP_S_LAST, +}; + +/* + * ICMP State Values + */ +enum { + IP_VS_ICMP_S_NORMAL, + IP_VS_ICMP_S_LAST, +}; + +/* + * SCTP State Values + */ +enum ip_vs_sctp_states { + IP_VS_SCTP_S_NONE, + IP_VS_SCTP_S_INIT_CLI, + IP_VS_SCTP_S_INIT_SER, + IP_VS_SCTP_S_INIT_ACK_CLI, + IP_VS_SCTP_S_INIT_ACK_SER, + IP_VS_SCTP_S_ECHO_CLI, + IP_VS_SCTP_S_ECHO_SER, + IP_VS_SCTP_S_ESTABLISHED, + IP_VS_SCTP_S_SHUT_CLI, + IP_VS_SCTP_S_SHUT_SER, + IP_VS_SCTP_S_SHUT_ACK_CLI, + IP_VS_SCTP_S_SHUT_ACK_SER, + 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 { + __u32 conns; /* connections scheduled */ + __u32 inpkts; /* incoming packets */ + __u32 outpkts; /* outgoing packets */ + __u64 inbytes; /* incoming bytes */ + __u64 outbytes; /* outgoing bytes */ +}; +/* + * Stats per cpu + */ +struct ip_vs_cpu_stats { + struct ip_vs_counters ustats; + struct u64_stats_sync syncp; +}; + +/* + * IPVS statistics objects + */ +struct ip_vs_estimator { + struct list_head list; + + u64 last_inbytes; + u64 last_outbytes; + u32 last_conns; + u32 last_inpkts; + u32 last_outpkts; + + u32 cps; + u32 inpps; + u32 outpps; + u32 inbps; + u32 outbps; +}; + +struct ip_vs_stats { + struct ip_vs_stats_user ustats; /* statistics */ + struct ip_vs_estimator est; /* estimator */ + struct ip_vs_cpu_stats *cpustats; /* per cpu counters */ + spinlock_t lock; /* spin lock */ + struct ip_vs_stats_user ustats0; /* 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); + + void (*init_netns)(struct net *net, struct ip_vs_proto_data *pd); + + void (*exit_netns)(struct net *net, struct ip_vs_proto_data *pd); + + int (*conn_schedule)(int af, struct sk_buff *skb, + struct ip_vs_proto_data *pd, + int *verdict, struct ip_vs_conn **cpp); + + struct ip_vs_conn * + (*conn_in_get)(int af, + const struct sk_buff *skb, + const struct ip_vs_iphdr *iph, + unsigned int proto_off, + int inverse); + + struct ip_vs_conn * + (*conn_out_get)(int af, + const struct sk_buff *skb, + const struct ip_vs_iphdr *iph, + unsigned int proto_off, + int inverse); + + int (*snat_handler)(struct sk_buff *skb, + struct ip_vs_protocol *pp, struct ip_vs_conn *cp); + + int (*dnat_handler)(struct sk_buff *skb, + struct ip_vs_protocol *pp, struct ip_vs_conn *cp); + + int (*csum_check)(int af, struct sk_buff *skb, + struct ip_vs_protocol *pp); + + const char *(*state_name)(int state); + + int (*state_transition)(struct ip_vs_conn *cp, int direction, + const struct sk_buff *skb, + struct ip_vs_proto_data *pd); + + int (*register_app)(struct net *net, struct ip_vs_app *inc); + + void (*unregister_app)(struct net *net, 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; +}; + +extern struct ip_vs_protocol *ip_vs_proto_get(unsigned short proto); +extern struct ip_vs_proto_data *ip_vs_proto_data_get(struct net *net, + unsigned short proto); + +struct ip_vs_conn_param { + struct net *net; + 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 */ +#ifdef CONFIG_NET_NS + struct net *net; /* Name space */ +#endif + /* Protocol, addresses and port numbers */ + u16 af; /* address family */ + __be16 cport; + __be16 vport; + __be16 dport; + __u32 fwmark; /* Fire wall mark from skb */ + 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) */ + + /* 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 + */ + + /* 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); + + /* 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; +}; + +/* + * To save some memory in conn table when name space is disabled. + */ +static inline struct net *ip_vs_conn_net(const struct ip_vs_conn *cp) +{ +#ifdef CONFIG_NET_NS + return cp->net; +#else + return &init_net; +#endif +} +static inline void ip_vs_conn_net_set(struct ip_vs_conn *cp, struct net *net) +{ +#ifdef CONFIG_NET_NS + cp->net = net; +#endif +} + +static inline int ip_vs_conn_net_eq(const struct ip_vs_conn *cp, + struct net *net) +{ +#ifdef CONFIG_NET_NS + return cp->net == net; +#else + return 1; +#endif +} + +/* + * Extended internal versions of struct ip_vs_service_user and + * ip_vs_dest_user for IPv6 support. + * + * We need these to conveniently pass around service and destination + * options, but unfortunately, we also need to keep the old definitions to + * maintain userspace backwards compatibility for the setsockopt interface. + */ +struct ip_vs_service_user_kern { + /* virtual service addresses */ + u16 af; + u16 protocol; + union nf_inet_addr addr; /* virtual ip address */ + u16 port; + u32 fwmark; /* firwall mark of service */ + + /* virtual service options */ + char *sched_name; + char *pe_name; + unsigned flags; /* virtual service flags */ + unsigned timeout; /* persistent timeout in sec */ + u32 netmask; /* persistent netmask */ +}; + + +struct ip_vs_dest_user_kern { + /* destination server address */ + union nf_inet_addr addr; + u16 port; + + /* real server options */ + unsigned conn_flags; /* connection flags */ + int weight; /* destination weight */ + + /* thresholds for active connections */ + u32 u_threshold; /* upper threshold */ + u32 l_threshold; /* lower threshold */ +}; + + +/* + * The information about the virtual service offered to the net + * and the forwarding entries + */ +struct ip_vs_service { + struct list_head s_list; /* for normal service table */ + struct list_head f_list; /* for fwmark-based service table */ + atomic_t refcnt; /* reference counter */ + atomic_t usecnt; /* use counter */ + + u16 af; /* address family */ + __u16 protocol; /* which protocol (TCP/UDP) */ + union nf_inet_addr addr; /* IP address for virtual service */ + __be16 port; /* port number for the service */ + __u32 fwmark; /* firewall mark of the service */ + unsigned flags; /* service status flags */ + unsigned timeout; /* persistent timeout in ticks */ + __be32 netmask; /* grouping granularity */ + struct net *net; + + struct list_head destinations; /* real server d-linked list */ + __u32 num_dests; /* number of servers */ + struct ip_vs_stats stats; /* statistics for the service */ + struct ip_vs_app *inc; /* bind conns to this app inc */ + + /* for scheduling */ + struct ip_vs_scheduler *scheduler; /* bound scheduler object */ + rwlock_t sched_lock; /* lock sched_data */ + void *sched_data; /* scheduler application data */ + + /* alternate persistence engine */ + struct ip_vs_pe *pe; +}; + + +/* + * The real server destination forwarding entry + * with ip address, port number, and so on. + */ +struct ip_vs_dest { + struct list_head n_list; /* for the dests in the service */ + struct list_head d_list; /* for table with all the dests */ + + u16 af; /* address family */ + __be16 port; /* port number of the server */ + union nf_inet_addr addr; /* IP address of the server */ + volatile unsigned flags; /* dest status flags */ + atomic_t conn_flags; /* flags to copy to conn */ + atomic_t weight; /* server weight */ + + atomic_t refcnt; /* reference counter */ + struct ip_vs_stats stats; /* statistics */ + + /* connection counters and thresholds */ + atomic_t activeconns; /* active connections */ + atomic_t inactconns; /* inactive connections */ + atomic_t persistconns; /* persistent connections */ + __u32 u_threshold; /* upper threshold */ + __u32 l_threshold; /* lower threshold */ + + /* for destination cache */ + spinlock_t dst_lock; /* lock of dst_cache */ + struct dst_entry *dst_cache; /* destination cache entry */ + u32 dst_rtos; /* RT_TOS(tos) for dst */ + u32 dst_cookie; + union nf_inet_addr dst_saddr; + + /* for virtual service */ + struct ip_vs_service *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 */ +}; + + +/* + * The scheduler object + */ +struct ip_vs_scheduler { + struct list_head n_list; /* d-linked list head */ + char *name; /* scheduler name */ + atomic_t refcnt; /* reference counter */ + struct module *module; /* THIS_MODULE/NULL */ + + /* scheduler initializing service */ + int (*init_service)(struct ip_vs_service *svc); + /* scheduling service finish */ + int (*done_service)(struct ip_vs_service *svc); + /* scheduler updating service */ + int (*update_service)(struct ip_vs_service *svc); + + /* selecting a server from the given service */ + struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc, + const struct sk_buff *skb); +}; + +/* The 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); +}; + +/* + * The application module object (a.k.a. app incarnation) + */ +struct ip_vs_app { + struct list_head a_list; /* member in app list */ + int type; /* IP_VS_APP_TYPE_xxx */ + char *name; /* application module name */ + __u16 protocol; + struct module *module; /* THIS_MODULE/NULL */ + struct list_head incs_list; /* list of incarnations */ + + /* members for application incarnations */ + struct list_head p_list; /* member in proto app list */ + struct ip_vs_app *app; /* its real application */ + __be16 port; /* port number in net order */ + atomic_t usecnt; /* usage counter */ + + /* + * output hook: 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, unsigned int proto_off, + int inverse); + + struct ip_vs_conn * + (*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app, + const struct iphdr *iph, unsigned int proto_off, + int inverse); + + int (*state_transition)(struct ip_vs_conn *cp, int direction, + const struct sk_buff *skb, + struct ip_vs_app *app); + + void (*timeout_change)(struct ip_vs_app *app, int flags); +}; + +/* IPVS 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 list_head rs_table[IP_VS_RTAB_SIZE]; + /* ip_vs_app */ + struct list_head app_list; + /* ip_vs_ftp */ + struct ip_vs_app *ftp_app; + /* 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]; + spinlock_t tcp_app_lock; +#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]; + spinlock_t udp_app_lock; +#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]; + spinlock_t sctp_app_lock; +#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 */ + + rwlock_t rs_lock; /* real services table */ + /* semaphore for IPVS sockopts. And, [gs]etsockopt may sleep. */ + struct lock_class_key ctl_key; /* ctl_mutex debuging */ + /* Trash for destinations */ + struct list_head dest_trash; + /* Service counters */ + atomic_t ftpsvc_counter; + atomic_t nullsvc_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_cache_bypass; + int sysctl_expire_nodest_conn; + int sysctl_expire_quiescent_template; + int sysctl_sync_threshold[2]; + int sysctl_nat_icmp_send; + + /* 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 */ + struct list_head sync_queue; + spinlock_t sync_lock; + struct ip_vs_sync_buff *sync_buff; + spinlock_t sync_buff_lock; + struct sockaddr_in sync_mcast_addr; + struct task_struct *master_thread; + struct task_struct *backup_thread; + int send_mesg_maxlen; + int recv_mesg_maxlen; + volatile int sync_state; + volatile int master_syncid; + volatile int backup_syncid; + /* multicast interface name */ + char master_mcast_ifn[IP_VS_IFNAME_MAXLEN]; + char backup_mcast_ifn[IP_VS_IFNAME_MAXLEN]; + /* net name space ptr */ + struct net *net; /* Needed by timer routines */ +}; + +#define DEFAULT_SYNC_THRESHOLD 3 +#define DEFAULT_SYNC_PERIOD 50 +#define DEFAULT_SYNC_VER 1 + +#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 ipvs->sysctl_sync_threshold[1]; +} + +static inline int sysctl_sync_ver(struct netns_ipvs *ipvs) +{ + return ipvs->sysctl_sync_ver; +} + +#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 int sysctl_sync_ver(struct netns_ipvs *ipvs) +{ + return DEFAULT_SYNC_VER; +} + +#endif + +/* + * IPVS core functions + * (from ip_vs_core.c) + */ +extern const char *ip_vs_proto_name(unsigned proto); +extern void ip_vs_init_hash_table(struct list_head *table, int rows); +#define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table((t), ARRAY_SIZE((t))) + +#define IP_VS_APP_TYPE_FTP 1 + +/* + * ip_vs_conn handling functions + * (from ip_vs_conn.c) + */ + +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 net *net, 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->net = net; + 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(int af, const struct sk_buff *skb, + const struct ip_vs_iphdr *iph, + unsigned int proto_off, + int inverse); + +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(int af, const struct sk_buff *skb, + const struct ip_vs_iphdr *iph, + unsigned int proto_off, + int inverse); + +/* put back the conn without restarting its timer */ +static inline void __ip_vs_conn_put(struct ip_vs_conn *cp) +{ + atomic_dec(&cp->refcnt); +} +extern void ip_vs_conn_put(struct ip_vs_conn *cp); +extern void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport); + +struct ip_vs_conn *ip_vs_conn_new(const struct ip_vs_conn_param *p, + const union nf_inet_addr *daddr, + __be16 dport, unsigned flags, + struct ip_vs_dest *dest, __u32 fwmark); +extern void ip_vs_conn_expire_now(struct ip_vs_conn *cp); + +extern const char * ip_vs_state_name(__u16 proto, int state); + +extern void ip_vs_tcp_conn_listen(struct net *net, struct ip_vs_conn *cp); +extern int ip_vs_check_template(struct ip_vs_conn *ct); +extern void ip_vs_random_dropentry(struct net *net); +extern int ip_vs_conn_init(void); +extern void ip_vs_conn_cleanup(void); + +static inline void ip_vs_control_del(struct ip_vs_conn *cp) +{ + struct ip_vs_conn *ctl_cp = cp->control; + if (!ctl_cp) { + IP_VS_ERR_BUF("request control DEL for uncontrolled: " + "%s:%d to %s:%d\n", + IP_VS_DBG_ADDR(cp->af, &cp->caddr), + ntohs(cp->cport), + IP_VS_DBG_ADDR(cp->af, &cp->vaddr), + ntohs(cp->vport)); + + return; + } + + IP_VS_DBG_BUF(7, "DELeting control for: " + "cp.dst=%s:%d ctl_cp.dst=%s:%d\n", + IP_VS_DBG_ADDR(cp->af, &cp->caddr), + ntohs(cp->cport), + IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr), + ntohs(ctl_cp->cport)); + + cp->control = NULL; + if (atomic_read(&ctl_cp->n_control) == 0) { + IP_VS_ERR_BUF("BUG control DEL with n=0 : " + "%s:%d to %s:%d\n", + IP_VS_DBG_ADDR(cp->af, &cp->caddr), + ntohs(cp->cport), + IP_VS_DBG_ADDR(cp->af, &cp->vaddr), + ntohs(cp->vport)); + + return; + } + atomic_dec(&ctl_cp->n_control); +} + +static inline void +ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp) +{ + if (cp->control) { + IP_VS_ERR_BUF("request control ADD for already controlled: " + "%s:%d to %s:%d\n", + IP_VS_DBG_ADDR(cp->af, &cp->caddr), + ntohs(cp->cport), + IP_VS_DBG_ADDR(cp->af, &cp->vaddr), + ntohs(cp->vport)); + + ip_vs_control_del(cp); + } + + IP_VS_DBG_BUF(7, "ADDing control for: " + "cp.dst=%s:%d ctl_cp.dst=%s:%d\n", + IP_VS_DBG_ADDR(cp->af, &cp->caddr), + ntohs(cp->cport), + IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr), + ntohs(ctl_cp->cport)); + + cp->control = ctl_cp; + atomic_inc(&ctl_cp->n_control); +} + +/* + * IPVS netns init & cleanup functions + */ +extern int __ip_vs_estimator_init(struct net *net); +extern int __ip_vs_control_init(struct net *net); +extern int __ip_vs_protocol_init(struct net *net); +extern int __ip_vs_app_init(struct net *net); +extern int __ip_vs_conn_init(struct net *net); +extern int __ip_vs_sync_init(struct net *net); +extern void __ip_vs_conn_cleanup(struct net *net); +extern void __ip_vs_app_cleanup(struct net *net); +extern void __ip_vs_protocol_cleanup(struct net *net); +extern void __ip_vs_control_cleanup(struct net *net); +extern void __ip_vs_estimator_cleanup(struct net *net); +extern void __ip_vs_sync_cleanup(struct net *net); +extern void __ip_vs_service_cleanup(struct net *net); + +/* + * IPVS application functions + * (from ip_vs_app.c) + */ +#define IP_VS_APP_MAX_PORTS 8 +extern int register_ip_vs_app(struct net *net, struct ip_vs_app *app); +extern void unregister_ip_vs_app(struct net *net, struct ip_vs_app *app); +extern int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp); +extern void ip_vs_unbind_app(struct ip_vs_conn *cp); +extern int register_ip_vs_app_inc(struct net *net, struct ip_vs_app *app, + __u16 proto, __u16 port); +extern int ip_vs_app_inc_get(struct ip_vs_app *inc); +extern void ip_vs_app_inc_put(struct ip_vs_app *inc); + +extern int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb); +extern int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb); +extern int ip_vs_app_init(void); +extern void ip_vs_app_cleanup(void); + +void ip_vs_bind_pe(struct ip_vs_service *svc, struct ip_vs_pe *pe); +void ip_vs_unbind_pe(struct ip_vs_service *svc); +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); + +static inline void ip_vs_pe_get(const struct ip_vs_pe *pe) +{ + if (pe && pe->module) + __module_get(pe->module); +} + +static inline void ip_vs_pe_put(const struct ip_vs_pe *pe) +{ + if (pe && pe->module) + module_put(pe->module); +} + +/* + * IPVS protocol functions (from ip_vs_proto.c) + */ +extern int ip_vs_protocol_init(void); +extern void ip_vs_protocol_cleanup(void); +extern void ip_vs_protocol_timeout_change(struct netns_ipvs *ipvs, int flags); +extern int *ip_vs_create_timeout_table(int *table, int size); +extern int +ip_vs_set_state_timeout(int *table, int num, const char *const *names, + const char *name, int to); +extern void +ip_vs_tcpudp_debug_packet(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) + */ +extern int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler); +extern int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler); +extern int ip_vs_bind_scheduler(struct ip_vs_service *svc, + struct ip_vs_scheduler *scheduler); +extern int ip_vs_unbind_scheduler(struct ip_vs_service *svc); +extern struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name); +extern void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler); +extern struct ip_vs_conn * +ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb, + struct ip_vs_proto_data *pd, int *ignored); +extern int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb, + struct ip_vs_proto_data *pd); + +extern 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 const struct ctl_path net_vs_ctl_path[]; +extern int sysctl_ip_vs_sync_ver; + +extern void ip_vs_sync_switch_mode(struct net *net, int mode); +extern struct ip_vs_service * +ip_vs_service_get(struct net *net, int af, __u32 fwmark, __u16 protocol, + const union nf_inet_addr *vaddr, __be16 vport); + +static inline void ip_vs_service_put(struct ip_vs_service *svc) +{ + atomic_dec(&svc->usecnt); +} + +extern struct ip_vs_dest * +ip_vs_lookup_real_service(struct net *net, int af, __u16 protocol, + const union nf_inet_addr *daddr, __be16 dport); + +extern int ip_vs_use_count_inc(void); +extern void ip_vs_use_count_dec(void); +extern int ip_vs_control_init(void); +extern void ip_vs_control_cleanup(void); +extern struct ip_vs_dest * +ip_vs_find_dest(struct net *net, int af, const union nf_inet_addr *daddr, + __be16 dport, const union nf_inet_addr *vaddr, __be16 vport, + __u16 protocol, __u32 fwmark); +extern struct ip_vs_dest *ip_vs_try_bind_dest(struct ip_vs_conn *cp); + + +/* + * IPVS sync daemon data and function prototypes + * (from ip_vs_sync.c) + */ +extern int start_sync_thread(struct net *net, int state, char *mcast_ifn, + __u8 syncid); +extern int stop_sync_thread(struct net *net, int state); +extern void ip_vs_sync_conn(struct net *net, struct ip_vs_conn *cp); +extern int ip_vs_sync_init(void); +extern void ip_vs_sync_cleanup(void); + + +/* + * IPVS rate estimator prototypes (from ip_vs_est.c) + */ +extern int ip_vs_estimator_init(void); +extern void ip_vs_estimator_cleanup(void); +extern void ip_vs_start_estimator(struct net *net, struct ip_vs_stats *stats); +extern void ip_vs_stop_estimator(struct net *net, struct ip_vs_stats *stats); +extern void ip_vs_zero_estimator(struct ip_vs_stats *stats); +extern void ip_vs_read_estimator(struct ip_vs_stats_user *dst, + struct ip_vs_stats *stats); + +/* + * Various IPVS packet transmitters (from ip_vs_xmit.c) + */ +extern int ip_vs_null_xmit +(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); +extern int ip_vs_bypass_xmit +(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); +extern int ip_vs_nat_xmit +(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); +extern int ip_vs_tunnel_xmit +(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); +extern int ip_vs_dr_xmit +(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); +extern int ip_vs_icmp_xmit +(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp, + int offset, unsigned int hooknum); +extern void ip_vs_dst_reset(struct ip_vs_dest *dest); + +#ifdef CONFIG_IP_VS_IPV6 +extern int ip_vs_bypass_xmit_v6 +(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); +extern int ip_vs_nat_xmit_v6 +(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); +extern int ip_vs_tunnel_xmit_v6 +(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); +extern int ip_vs_dr_xmit_v6 +(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); +extern int ip_vs_icmp_xmit_v6 +(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp, + int offset, unsigned int hooknum); +#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; +} + +extern void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp, + struct ip_vs_conn *cp, int dir); + +#ifdef CONFIG_IP_VS_IPV6 +extern void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp, + struct ip_vs_conn *cp, int dir); +#endif + +extern __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset); + +static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum) +{ + __be32 diff[2] = { ~old, new }; + + return csum_partial(diff, sizeof(diff), oldsum); +} + +#ifdef CONFIG_IP_VS_IPV6 +static inline __wsum ip_vs_check_diff16(const __be32 *old, const __be32 *new, + __wsum oldsum) +{ + __be32 diff[8] = { ~old[3], ~old[2], ~old[1], ~old[0], + new[3], new[2], new[1], new[0] }; + + return csum_partial(diff, sizeof(diff), oldsum); +} +#endif + +static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum) +{ + __be16 diff[2] = { ~old, new }; + + return csum_partial(diff, sizeof(diff), oldsum); +} + +/* + * 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_reset(skb); + 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 +} + +extern void ip_vs_update_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp, + int outin); +extern int ip_vs_confirm_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp); +extern 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); +extern 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, + struct ip_vs_conn *cp) +{ + return NF_ACCEPT; +} + +static inline void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp) +{ +} +/* CONFIG_IP_VS_NFCT */ +#endif + +static inline unsigned 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 */ |