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Diffstat (limited to 'include/net/ip_vs.h')
| -rw-r--r-- | include/net/ip_vs.h | 1869 |
1 files changed, 1869 insertions, 0 deletions
diff --git a/include/net/ip_vs.h b/include/net/ip_vs.h new file mode 100644 index 000000000..ff406ef4f --- /dev/null +++ b/include/net/ip_vs.h @@ -0,0 +1,1869 @@ +/* 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 */ +#include <linux/sched/isolation.h> + +#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; + +extern struct mutex __ip_vs_mutex; + +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) + +/* 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_stats_t conns; /* connections scheduled */ + u64_stats_t inpkts; /* incoming packets */ + u64_stats_t outpkts; /* outgoing packets */ + u64_stats_t inbytes; /* incoming bytes */ + u64_stats_t outbytes; /* outgoing bytes */ +}; +/* Stats per cpu */ +struct ip_vs_cpu_stats { + struct ip_vs_counters cnt; + struct u64_stats_sync syncp; +}; + +/* Default nice for estimator kthreads */ +#define IPVS_EST_NICE 0 + +/* IPVS statistics objects */ +struct ip_vs_estimator { + struct hlist_node 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; + + s32 ktid:16, /* kthread ID, -1=temp list */ + ktrow:8, /* row/tick ID for kthread */ + ktcid:8; /* chain ID for kthread tick */ +}; + +/* + * 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 ip_vs_stats_rcu { + struct ip_vs_stats s; + struct rcu_head rcu_head; +}; + +int ip_vs_stats_init_alloc(struct ip_vs_stats *s); +struct ip_vs_stats *ip_vs_stats_alloc(void); +void ip_vs_stats_release(struct ip_vs_stats *stats); +void ip_vs_stats_free(struct ip_vs_stats *stats); + +/* Process estimators in multiple timer ticks (20/50/100, see ktrow) */ +#define IPVS_EST_NTICKS 50 +/* Estimation uses a 2-second period containing ticks (in jiffies) */ +#define IPVS_EST_TICK ((2 * HZ) / IPVS_EST_NTICKS) + +/* Limit of CPU load per kthread (8 for 12.5%), ratio of CPU capacity (1/C). + * Value of 4 and above ensures kthreads will take work without exceeding + * the CPU capacity under different circumstances. + */ +#define IPVS_EST_LOAD_DIVISOR 8 + +/* Kthreads should not have work that exceeds the CPU load above 50% */ +#define IPVS_EST_CPU_KTHREADS (IPVS_EST_LOAD_DIVISOR / 2) + +/* Desired number of chains per timer tick (chain load factor in 100us units), + * 48=4.8ms of 40ms tick (12% CPU usage): + * 2 sec * 1000 ms in sec * 10 (100us in ms) / 8 (12.5%) / 50 + */ +#define IPVS_EST_CHAIN_FACTOR \ + ALIGN_DOWN(2 * 1000 * 10 / IPVS_EST_LOAD_DIVISOR / IPVS_EST_NTICKS, 8) + +/* Compiled number of chains per tick + * The defines should match cond_resched_rcu + */ +#if defined(CONFIG_DEBUG_ATOMIC_SLEEP) || !defined(CONFIG_PREEMPT_RCU) +#define IPVS_EST_TICK_CHAINS IPVS_EST_CHAIN_FACTOR +#else +#define IPVS_EST_TICK_CHAINS 1 +#endif + +#if IPVS_EST_NTICKS > 127 +#error Too many timer ticks for ktrow +#endif + +/* Multiple chains processed in same tick */ +struct ip_vs_est_tick_data { + struct rcu_head rcu_head; + struct hlist_head chains[IPVS_EST_TICK_CHAINS]; + DECLARE_BITMAP(present, IPVS_EST_TICK_CHAINS); + DECLARE_BITMAP(full, IPVS_EST_TICK_CHAINS); + int chain_len[IPVS_EST_TICK_CHAINS]; +}; + +/* Context for estimation kthread */ +struct ip_vs_est_kt_data { + struct netns_ipvs *ipvs; + struct task_struct *task; /* task if running */ + struct ip_vs_est_tick_data __rcu *ticks[IPVS_EST_NTICKS]; + DECLARE_BITMAP(avail, IPVS_EST_NTICKS); /* tick has space for ests */ + unsigned long est_timer; /* estimation timer (jiffies) */ + struct ip_vs_stats *calc_stats; /* Used for calculation */ + int tick_len[IPVS_EST_NTICKS]; /* est count */ + int id; /* ktid per netns */ + int chain_max; /* max ests per tick chain */ + int tick_max; /* max ests per tick */ + int est_count; /* attached ests to kthread */ + int est_max_count; /* max ests per kthread */ + int add_row; /* row for new ests */ + int est_row; /* estimated row */ +}; + +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 triggered + * 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_group(sync_conn_opt, + 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; /* firewall 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 rcu_head rcu_head; + 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_rcu *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; +#ifdef CONFIG_SYSCTL + cpumask_var_t sysctl_est_cpulist; /* kthread cpumask */ + int est_cpulist_valid; /* cpulist set */ + int sysctl_est_nice; /* kthread nice */ + int est_stopped; /* stop tasks */ +#endif + + /* 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 delayed_work est_reload_work;/* Reload kthread tasks */ + struct mutex est_mutex; /* protect kthread tasks */ + struct hlist_head est_temp_list; /* Ests during calc phase */ + struct ip_vs_est_kt_data **est_kt_arr; /* Array of kthread data ptrs */ + unsigned long est_max_threads;/* Hard limit of kthreads */ + int est_calc_phase; /* Calculation phase */ + int est_chain_max; /* Calculated chain_max */ + int est_kt_count; /* Allocated ptrs */ + int est_add_ktid; /* ktid where to add ests */ + atomic_t est_genid; /* kthreads reload genid */ + atomic_t est_genid_done; /* applied genid */ + /* 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 because 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; +} + +static inline const struct cpumask *sysctl_est_cpulist(struct netns_ipvs *ipvs) +{ + if (ipvs->est_cpulist_valid) + return ipvs->sysctl_est_cpulist; + else + return housekeeping_cpumask(HK_TYPE_KTHREAD); +} + +static inline int sysctl_est_nice(struct netns_ipvs *ipvs) +{ + return ipvs->sysctl_est_nice; +} + +#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; +} + +static inline const struct cpumask *sysctl_est_cpulist(struct netns_ipvs *ipvs) +{ + return housekeeping_cpumask(HK_TYPE_KTHREAD); +} + +static inline int sysctl_est_nice(struct netns_ipvs *ipvs) +{ + return IPVS_EST_NICE; +} + +#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) */ +int 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); +void ip_vs_est_reload_start(struct netns_ipvs *ipvs); +int ip_vs_est_kthread_start(struct netns_ipvs *ipvs, + struct ip_vs_est_kt_data *kd); +void ip_vs_est_kthread_stop(struct ip_vs_est_kt_data *kd); + +static inline void ip_vs_est_stopped_recalc(struct netns_ipvs *ipvs) +{ +#ifdef CONFIG_SYSCTL + /* Stop tasks while cpulist is empty or if disabled with flag */ + ipvs->est_stopped = !sysctl_run_estimation(ipvs) || + (ipvs->est_cpulist_valid && + cpumask_empty(sysctl_est_cpulist(ipvs))); +#endif +} + +static inline bool ip_vs_est_stopped(struct netns_ipvs *ipvs) +{ +#ifdef CONFIG_SYSCTL + return ipvs->est_stopped; +#else + return false; +#endif +} + +static inline int ip_vs_est_max_threads(struct netns_ipvs *ipvs) +{ + unsigned int limit = IPVS_EST_CPU_KTHREADS * + cpumask_weight(sysctl_est_cpulist(ipvs)); + + return max(1U, limit); +} + +/* 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 */ |