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TOMOYO Linux Cross Reference
Linux/include/net/ip_vs.h

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  1 /* IP Virtual Server
  2  * data structure and functionality definitions
  3  */
  4 
  5 #ifndef _NET_IP_VS_H
  6 #define _NET_IP_VS_H
  7 
  8 #include <linux/ip_vs.h>                /* definitions shared with userland */
  9 
 10 #include <asm/types.h>                  /* for __uXX types */
 11 
 12 #include <linux/list.h>                 /* for struct list_head */
 13 #include <linux/spinlock.h>             /* for struct rwlock_t */
 14 #include <linux/atomic.h>               /* for struct atomic_t */
 15 #include <linux/compiler.h>
 16 #include <linux/timer.h>
 17 #include <linux/bug.h>
 18 
 19 #include <net/checksum.h>
 20 #include <linux/netfilter.h>            /* for union nf_inet_addr */
 21 #include <linux/ip.h>
 22 #include <linux/ipv6.h>                 /* for struct ipv6hdr */
 23 #include <net/ipv6.h>
 24 #if IS_ENABLED(CONFIG_IP_VS_IPV6)
 25 #include <linux/netfilter_ipv6/ip6_tables.h>
 26 #endif
 27 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
 28 #include <net/netfilter/nf_conntrack.h>
 29 #endif
 30 #include <net/net_namespace.h>          /* Netw namespace */
 31 
 32 /* Generic access of ipvs struct */
 33 static inline struct netns_ipvs *net_ipvs(struct net* net)
 34 {
 35         return net->ipvs;
 36 }
 37 
 38 /* Get net ptr from skb in traffic cases
 39  * use skb_sknet when call is from userland (ioctl or netlink)
 40  */
 41 static inline struct net *skb_net(const struct sk_buff *skb)
 42 {
 43 #ifdef CONFIG_NET_NS
 44 #ifdef CONFIG_IP_VS_DEBUG
 45         /*
 46          * This is used for debug only.
 47          * Start with the most likely hit
 48          * End with BUG
 49          */
 50         if (likely(skb->dev && skb->dev->nd_net))
 51                 return dev_net(skb->dev);
 52         if (skb_dst(skb) && skb_dst(skb)->dev)
 53                 return dev_net(skb_dst(skb)->dev);
 54         WARN(skb->sk, "Maybe skb_sknet should be used in %s() at line:%d\n",
 55                       __func__, __LINE__);
 56         if (likely(skb->sk && skb->sk->sk_net))
 57                 return sock_net(skb->sk);
 58         pr_err("There is no net ptr to find in the skb in %s() line:%d\n",
 59                 __func__, __LINE__);
 60         BUG();
 61 #else
 62         return dev_net(skb->dev ? : skb_dst(skb)->dev);
 63 #endif
 64 #else
 65         return &init_net;
 66 #endif
 67 }
 68 
 69 static inline struct net *skb_sknet(const struct sk_buff *skb)
 70 {
 71 #ifdef CONFIG_NET_NS
 72 #ifdef CONFIG_IP_VS_DEBUG
 73         /* Start with the most likely hit */
 74         if (likely(skb->sk && skb->sk->sk_net))
 75                 return sock_net(skb->sk);
 76         WARN(skb->dev, "Maybe skb_net should be used instead in %s() line:%d\n",
 77                        __func__, __LINE__);
 78         if (likely(skb->dev && skb->dev->nd_net))
 79                 return dev_net(skb->dev);
 80         pr_err("There is no net ptr to find in the skb in %s() line:%d\n",
 81                 __func__, __LINE__);
 82         BUG();
 83 #else
 84         return sock_net(skb->sk);
 85 #endif
 86 #else
 87         return &init_net;
 88 #endif
 89 }
 90 
 91 /* This one needed for single_open_net since net is stored directly in
 92  * private not as a struct i.e. seq_file_net can't be used.
 93  */
 94 static inline struct net *seq_file_single_net(struct seq_file *seq)
 95 {
 96 #ifdef CONFIG_NET_NS
 97         return (struct net *)seq->private;
 98 #else
 99         return &init_net;
100 #endif
101 }
102 
103 /* Connections' size value needed by ip_vs_ctl.c */
104 extern int ip_vs_conn_tab_size;
105 
106 struct ip_vs_iphdr {
107         __u32 len;      /* IPv4 simply where L4 starts
108                          * IPv6 where L4 Transport Header starts */
109         __u16 fragoffs; /* IPv6 fragment offset, 0 if first frag (or not frag)*/
110         __s16 protocol;
111         __s32 flags;
112         union nf_inet_addr saddr;
113         union nf_inet_addr daddr;
114 };
115 
116 static inline void *frag_safe_skb_hp(const struct sk_buff *skb, int offset,
117                                       int len, void *buffer,
118                                       const struct ip_vs_iphdr *ipvsh)
119 {
120         return skb_header_pointer(skb, offset, len, buffer);
121 }
122 
123 static inline void
124 ip_vs_fill_ip4hdr(const void *nh, struct ip_vs_iphdr *iphdr)
125 {
126         const struct iphdr *iph = nh;
127 
128         iphdr->len      = iph->ihl * 4;
129         iphdr->fragoffs = 0;
130         iphdr->protocol = iph->protocol;
131         iphdr->saddr.ip = iph->saddr;
132         iphdr->daddr.ip = iph->daddr;
133 }
134 
135 /* This function handles filling *ip_vs_iphdr, both for IPv4 and IPv6.
136  * IPv6 requires some extra work, as finding proper header position,
137  * depend on the IPv6 extension headers.
138  */
139 static inline void
140 ip_vs_fill_iph_skb(int af, const struct sk_buff *skb, struct ip_vs_iphdr *iphdr)
141 {
142 #ifdef CONFIG_IP_VS_IPV6
143         if (af == AF_INET6) {
144                 const struct ipv6hdr *iph =
145                         (struct ipv6hdr *)skb_network_header(skb);
146                 iphdr->saddr.in6 = iph->saddr;
147                 iphdr->daddr.in6 = iph->daddr;
148                 /* ipv6_find_hdr() updates len, flags */
149                 iphdr->len       = 0;
150                 iphdr->flags     = 0;
151                 iphdr->protocol  = ipv6_find_hdr(skb, &iphdr->len, -1,
152                                                  &iphdr->fragoffs,
153                                                  &iphdr->flags);
154         } else
155 #endif
156         {
157                 const struct iphdr *iph =
158                         (struct iphdr *)skb_network_header(skb);
159                 iphdr->len      = iph->ihl * 4;
160                 iphdr->fragoffs = 0;
161                 iphdr->protocol = iph->protocol;
162                 iphdr->saddr.ip = iph->saddr;
163                 iphdr->daddr.ip = iph->daddr;
164         }
165 }
166 
167 static inline void ip_vs_addr_copy(int af, union nf_inet_addr *dst,
168                                    const union nf_inet_addr *src)
169 {
170 #ifdef CONFIG_IP_VS_IPV6
171         if (af == AF_INET6)
172                 dst->in6 = src->in6;
173         else
174 #endif
175         dst->ip = src->ip;
176 }
177 
178 static inline void ip_vs_addr_set(int af, union nf_inet_addr *dst,
179                                   const union nf_inet_addr *src)
180 {
181 #ifdef CONFIG_IP_VS_IPV6
182         if (af == AF_INET6) {
183                 dst->in6 = src->in6;
184                 return;
185         }
186 #endif
187         dst->ip = src->ip;
188         dst->all[1] = 0;
189         dst->all[2] = 0;
190         dst->all[3] = 0;
191 }
192 
193 static inline int ip_vs_addr_equal(int af, const union nf_inet_addr *a,
194                                    const union nf_inet_addr *b)
195 {
196 #ifdef CONFIG_IP_VS_IPV6
197         if (af == AF_INET6)
198                 return ipv6_addr_equal(&a->in6, &b->in6);
199 #endif
200         return a->ip == b->ip;
201 }
202 
203 #ifdef CONFIG_IP_VS_DEBUG
204 #include <linux/net.h>
205 
206 int ip_vs_get_debug_level(void);
207 
208 static inline const char *ip_vs_dbg_addr(int af, char *buf, size_t buf_len,
209                                          const union nf_inet_addr *addr,
210                                          int *idx)
211 {
212         int len;
213 #ifdef CONFIG_IP_VS_IPV6
214         if (af == AF_INET6)
215                 len = snprintf(&buf[*idx], buf_len - *idx, "[%pI6c]",
216                                &addr->in6) + 1;
217         else
218 #endif
219                 len = snprintf(&buf[*idx], buf_len - *idx, "%pI4",
220                                &addr->ip) + 1;
221 
222         *idx += len;
223         BUG_ON(*idx > buf_len + 1);
224         return &buf[*idx - len];
225 }
226 
227 #define IP_VS_DBG_BUF(level, msg, ...)                                  \
228         do {                                                            \
229                 char ip_vs_dbg_buf[160];                                \
230                 int ip_vs_dbg_idx = 0;                                  \
231                 if (level <= ip_vs_get_debug_level())                   \
232                         printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__);  \
233         } while (0)
234 #define IP_VS_ERR_BUF(msg...)                                           \
235         do {                                                            \
236                 char ip_vs_dbg_buf[160];                                \
237                 int ip_vs_dbg_idx = 0;                                  \
238                 pr_err(msg);                                            \
239         } while (0)
240 
241 /* Only use from within IP_VS_DBG_BUF() or IP_VS_ERR_BUF macros */
242 #define IP_VS_DBG_ADDR(af, addr)                                        \
243         ip_vs_dbg_addr(af, ip_vs_dbg_buf,                               \
244                        sizeof(ip_vs_dbg_buf), addr,                     \
245                        &ip_vs_dbg_idx)
246 
247 #define IP_VS_DBG(level, msg, ...)                                      \
248         do {                                                            \
249                 if (level <= ip_vs_get_debug_level())                   \
250                         printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__);  \
251         } while (0)
252 #define IP_VS_DBG_RL(msg, ...)                                          \
253         do {                                                            \
254                 if (net_ratelimit())                                    \
255                         printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__);  \
256         } while (0)
257 #define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg)                     \
258         do {                                                            \
259                 if (level <= ip_vs_get_debug_level())                   \
260                         pp->debug_packet(af, pp, skb, ofs, msg);        \
261         } while (0)
262 #define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg)                  \
263         do {                                                            \
264                 if (level <= ip_vs_get_debug_level() &&                 \
265                     net_ratelimit())                                    \
266                         pp->debug_packet(af, pp, skb, ofs, msg);        \
267         } while (0)
268 #else   /* NO DEBUGGING at ALL */
269 #define IP_VS_DBG_BUF(level, msg...)  do {} while (0)
270 #define IP_VS_ERR_BUF(msg...)  do {} while (0)
271 #define IP_VS_DBG(level, msg...)  do {} while (0)
272 #define IP_VS_DBG_RL(msg...)  do {} while (0)
273 #define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg)     do {} while (0)
274 #define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg)  do {} while (0)
275 #endif
276 
277 #define IP_VS_BUG() BUG()
278 #define IP_VS_ERR_RL(msg, ...)                                          \
279         do {                                                            \
280                 if (net_ratelimit())                                    \
281                         pr_err(msg, ##__VA_ARGS__);                     \
282         } while (0)
283 
284 #ifdef CONFIG_IP_VS_DEBUG
285 #define EnterFunction(level)                                            \
286         do {                                                            \
287                 if (level <= ip_vs_get_debug_level())                   \
288                         printk(KERN_DEBUG                               \
289                                pr_fmt("Enter: %s, %s line %i\n"),       \
290                                __func__, __FILE__, __LINE__);           \
291         } while (0)
292 #define LeaveFunction(level)                                            \
293         do {                                                            \
294                 if (level <= ip_vs_get_debug_level())                   \
295                         printk(KERN_DEBUG                               \
296                                pr_fmt("Leave: %s, %s line %i\n"),       \
297                                __func__, __FILE__, __LINE__);           \
298         } while (0)
299 #else
300 #define EnterFunction(level)   do {} while (0)
301 #define LeaveFunction(level)   do {} while (0)
302 #endif
303 
304 /* The port number of FTP service (in network order). */
305 #define FTPPORT  cpu_to_be16(21)
306 #define FTPDATA  cpu_to_be16(20)
307 
308 /* TCP State Values */
309 enum {
310         IP_VS_TCP_S_NONE = 0,
311         IP_VS_TCP_S_ESTABLISHED,
312         IP_VS_TCP_S_SYN_SENT,
313         IP_VS_TCP_S_SYN_RECV,
314         IP_VS_TCP_S_FIN_WAIT,
315         IP_VS_TCP_S_TIME_WAIT,
316         IP_VS_TCP_S_CLOSE,
317         IP_VS_TCP_S_CLOSE_WAIT,
318         IP_VS_TCP_S_LAST_ACK,
319         IP_VS_TCP_S_LISTEN,
320         IP_VS_TCP_S_SYNACK,
321         IP_VS_TCP_S_LAST
322 };
323 
324 /* UDP State Values */
325 enum {
326         IP_VS_UDP_S_NORMAL,
327         IP_VS_UDP_S_LAST,
328 };
329 
330 /* ICMP State Values */
331 enum {
332         IP_VS_ICMP_S_NORMAL,
333         IP_VS_ICMP_S_LAST,
334 };
335 
336 /* SCTP State Values */
337 enum ip_vs_sctp_states {
338         IP_VS_SCTP_S_NONE,
339         IP_VS_SCTP_S_INIT1,
340         IP_VS_SCTP_S_INIT,
341         IP_VS_SCTP_S_COOKIE_SENT,
342         IP_VS_SCTP_S_COOKIE_REPLIED,
343         IP_VS_SCTP_S_COOKIE_WAIT,
344         IP_VS_SCTP_S_COOKIE,
345         IP_VS_SCTP_S_COOKIE_ECHOED,
346         IP_VS_SCTP_S_ESTABLISHED,
347         IP_VS_SCTP_S_SHUTDOWN_SENT,
348         IP_VS_SCTP_S_SHUTDOWN_RECEIVED,
349         IP_VS_SCTP_S_SHUTDOWN_ACK_SENT,
350         IP_VS_SCTP_S_REJECTED,
351         IP_VS_SCTP_S_CLOSED,
352         IP_VS_SCTP_S_LAST
353 };
354 
355 /* Delta sequence info structure
356  * Each ip_vs_conn has 2 (output AND input seq. changes).
357  * Only used in the VS/NAT.
358  */
359 struct ip_vs_seq {
360         __u32                   init_seq;       /* Add delta from this seq */
361         __u32                   delta;          /* Delta in sequence numbers */
362         __u32                   previous_delta; /* Delta in sequence numbers
363                                                  * before last resized pkt */
364 };
365 
366 /* counters per cpu */
367 struct ip_vs_counters {
368         __u32           conns;          /* connections scheduled */
369         __u32           inpkts;         /* incoming packets */
370         __u32           outpkts;        /* outgoing packets */
371         __u64           inbytes;        /* incoming bytes */
372         __u64           outbytes;       /* outgoing bytes */
373 };
374 /* Stats per cpu */
375 struct ip_vs_cpu_stats {
376         struct ip_vs_counters   ustats;
377         struct u64_stats_sync   syncp;
378 };
379 
380 /* IPVS statistics objects */
381 struct ip_vs_estimator {
382         struct list_head        list;
383 
384         u64                     last_inbytes;
385         u64                     last_outbytes;
386         u32                     last_conns;
387         u32                     last_inpkts;
388         u32                     last_outpkts;
389 
390         u32                     cps;
391         u32                     inpps;
392         u32                     outpps;
393         u32                     inbps;
394         u32                     outbps;
395 };
396 
397 struct ip_vs_stats {
398         struct ip_vs_stats_user ustats;         /* statistics */
399         struct ip_vs_estimator  est;            /* estimator */
400         struct ip_vs_cpu_stats __percpu *cpustats;      /* per cpu counters */
401         spinlock_t              lock;           /* spin lock */
402         struct ip_vs_stats_user ustats0;        /* reset values */
403 };
404 
405 struct dst_entry;
406 struct iphdr;
407 struct ip_vs_conn;
408 struct ip_vs_app;
409 struct sk_buff;
410 struct ip_vs_proto_data;
411 
412 struct ip_vs_protocol {
413         struct ip_vs_protocol   *next;
414         char                    *name;
415         u16                     protocol;
416         u16                     num_states;
417         int                     dont_defrag;
418 
419         void (*init)(struct ip_vs_protocol *pp);
420 
421         void (*exit)(struct ip_vs_protocol *pp);
422 
423         int (*init_netns)(struct net *net, struct ip_vs_proto_data *pd);
424 
425         void (*exit_netns)(struct net *net, struct ip_vs_proto_data *pd);
426 
427         int (*conn_schedule)(int af, struct sk_buff *skb,
428                              struct ip_vs_proto_data *pd,
429                              int *verdict, struct ip_vs_conn **cpp,
430                              struct ip_vs_iphdr *iph);
431 
432         struct ip_vs_conn *
433         (*conn_in_get)(int af,
434                        const struct sk_buff *skb,
435                        const struct ip_vs_iphdr *iph,
436                        int inverse);
437 
438         struct ip_vs_conn *
439         (*conn_out_get)(int af,
440                         const struct sk_buff *skb,
441                         const struct ip_vs_iphdr *iph,
442                         int inverse);
443 
444         int (*snat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp,
445                             struct ip_vs_conn *cp, struct ip_vs_iphdr *iph);
446 
447         int (*dnat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp,
448                             struct ip_vs_conn *cp, struct ip_vs_iphdr *iph);
449 
450         int (*csum_check)(int af, struct sk_buff *skb,
451                           struct ip_vs_protocol *pp);
452 
453         const char *(*state_name)(int state);
454 
455         void (*state_transition)(struct ip_vs_conn *cp, int direction,
456                                  const struct sk_buff *skb,
457                                  struct ip_vs_proto_data *pd);
458 
459         int (*register_app)(struct net *net, struct ip_vs_app *inc);
460 
461         void (*unregister_app)(struct net *net, struct ip_vs_app *inc);
462 
463         int (*app_conn_bind)(struct ip_vs_conn *cp);
464 
465         void (*debug_packet)(int af, struct ip_vs_protocol *pp,
466                              const struct sk_buff *skb,
467                              int offset,
468                              const char *msg);
469 
470         void (*timeout_change)(struct ip_vs_proto_data *pd, int flags);
471 };
472 
473 /* protocol data per netns */
474 struct ip_vs_proto_data {
475         struct ip_vs_proto_data *next;
476         struct ip_vs_protocol   *pp;
477         int                     *timeout_table; /* protocol timeout table */
478         atomic_t                appcnt;         /* counter of proto app incs. */
479         struct tcp_states_t     *tcp_state_table;
480 };
481 
482 struct ip_vs_protocol   *ip_vs_proto_get(unsigned short proto);
483 struct ip_vs_proto_data *ip_vs_proto_data_get(struct net *net,
484                                               unsigned short proto);
485 
486 struct ip_vs_conn_param {
487         struct net                      *net;
488         const union nf_inet_addr        *caddr;
489         const union nf_inet_addr        *vaddr;
490         __be16                          cport;
491         __be16                          vport;
492         __u16                           protocol;
493         u16                             af;
494 
495         const struct ip_vs_pe           *pe;
496         char                            *pe_data;
497         __u8                            pe_data_len;
498 };
499 
500 /* IP_VS structure allocated for each dynamically scheduled connection */
501 struct ip_vs_conn {
502         struct hlist_node       c_list;         /* hashed list heads */
503         /* Protocol, addresses and port numbers */
504         __be16                  cport;
505         __be16                  dport;
506         __be16                  vport;
507         u16                     af;             /* address family */
508         union nf_inet_addr      caddr;          /* client address */
509         union nf_inet_addr      vaddr;          /* virtual address */
510         union nf_inet_addr      daddr;          /* destination address */
511         volatile __u32          flags;          /* status flags */
512         __u16                   protocol;       /* Which protocol (TCP/UDP) */
513         __u16                   daf;            /* Address family of the dest */
514 #ifdef CONFIG_NET_NS
515         struct net              *net;           /* Name space */
516 #endif
517 
518         /* counter and timer */
519         atomic_t                refcnt;         /* reference count */
520         struct timer_list       timer;          /* Expiration timer */
521         volatile unsigned long  timeout;        /* timeout */
522 
523         /* Flags and state transition */
524         spinlock_t              lock;           /* lock for state transition */
525         volatile __u16          state;          /* state info */
526         volatile __u16          old_state;      /* old state, to be used for
527                                                  * state transition triggerd
528                                                  * synchronization
529                                                  */
530         __u32                   fwmark;         /* Fire wall mark from skb */
531         unsigned long           sync_endtime;   /* jiffies + sent_retries */
532 
533         /* Control members */
534         struct ip_vs_conn       *control;       /* Master control connection */
535         atomic_t                n_control;      /* Number of controlled ones */
536         struct ip_vs_dest       *dest;          /* real server */
537         atomic_t                in_pkts;        /* incoming packet counter */
538 
539         /* Packet transmitter for different forwarding methods.  If it
540          * mangles the packet, it must return NF_DROP or better NF_STOLEN,
541          * otherwise this must be changed to a sk_buff **.
542          * NF_ACCEPT can be returned when destination is local.
543          */
544         int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp,
545                            struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
546 
547         /* Note: we can group the following members into a structure,
548          * in order to save more space, and the following members are
549          * only used in VS/NAT anyway
550          */
551         struct ip_vs_app        *app;           /* bound ip_vs_app object */
552         void                    *app_data;      /* Application private data */
553         struct ip_vs_seq        in_seq;         /* incoming seq. struct */
554         struct ip_vs_seq        out_seq;        /* outgoing seq. struct */
555 
556         const struct ip_vs_pe   *pe;
557         char                    *pe_data;
558         __u8                    pe_data_len;
559 
560         struct rcu_head         rcu_head;
561 };
562 
563 /* To save some memory in conn table when name space is disabled. */
564 static inline struct net *ip_vs_conn_net(const struct ip_vs_conn *cp)
565 {
566 #ifdef CONFIG_NET_NS
567         return cp->net;
568 #else
569         return &init_net;
570 #endif
571 }
572 
573 static inline void ip_vs_conn_net_set(struct ip_vs_conn *cp, struct net *net)
574 {
575 #ifdef CONFIG_NET_NS
576         cp->net = net;
577 #endif
578 }
579 
580 static inline int ip_vs_conn_net_eq(const struct ip_vs_conn *cp,
581                                     struct net *net)
582 {
583 #ifdef CONFIG_NET_NS
584         return cp->net == net;
585 #else
586         return 1;
587 #endif
588 }
589 
590 /* Extended internal versions of struct ip_vs_service_user and ip_vs_dest_user
591  * for IPv6 support.
592  *
593  * We need these to conveniently pass around service and destination
594  * options, but unfortunately, we also need to keep the old definitions to
595  * maintain userspace backwards compatibility for the setsockopt interface.
596  */
597 struct ip_vs_service_user_kern {
598         /* virtual service addresses */
599         u16                     af;
600         u16                     protocol;
601         union nf_inet_addr      addr;           /* virtual ip address */
602         __be16                  port;
603         u32                     fwmark;         /* firwall mark of service */
604 
605         /* virtual service options */
606         char                    *sched_name;
607         char                    *pe_name;
608         unsigned int            flags;          /* virtual service flags */
609         unsigned int            timeout;        /* persistent timeout in sec */
610         __be32                  netmask;        /* persistent netmask or plen */
611 };
612 
613 
614 struct ip_vs_dest_user_kern {
615         /* destination server address */
616         union nf_inet_addr      addr;
617         __be16                  port;
618 
619         /* real server options */
620         unsigned int            conn_flags;     /* connection flags */
621         int                     weight;         /* destination weight */
622 
623         /* thresholds for active connections */
624         u32                     u_threshold;    /* upper threshold */
625         u32                     l_threshold;    /* lower threshold */
626 
627         /* Address family of addr */
628         u16                     af;
629 };
630 
631 
632 /*
633  * The information about the virtual service offered to the net and the
634  * forwarding entries.
635  */
636 struct ip_vs_service {
637         struct hlist_node       s_list;   /* for normal service table */
638         struct hlist_node       f_list;   /* for fwmark-based service table */
639         atomic_t                refcnt;   /* reference counter */
640 
641         u16                     af;       /* address family */
642         __u16                   protocol; /* which protocol (TCP/UDP) */
643         union nf_inet_addr      addr;     /* IP address for virtual service */
644         __be16                  port;     /* port number for the service */
645         __u32                   fwmark;   /* firewall mark of the service */
646         unsigned int            flags;    /* service status flags */
647         unsigned int            timeout;  /* persistent timeout in ticks */
648         __be32                  netmask;  /* grouping granularity, mask/plen */
649         struct net              *net;
650 
651         struct list_head        destinations;  /* real server d-linked list */
652         __u32                   num_dests;     /* number of servers */
653         struct ip_vs_stats      stats;         /* statistics for the service */
654 
655         /* for scheduling */
656         struct ip_vs_scheduler __rcu *scheduler; /* bound scheduler object */
657         spinlock_t              sched_lock;    /* lock sched_data */
658         void                    *sched_data;   /* scheduler application data */
659 
660         /* alternate persistence engine */
661         struct ip_vs_pe __rcu   *pe;
662 
663         struct rcu_head         rcu_head;
664 };
665 
666 /* Information for cached dst */
667 struct ip_vs_dest_dst {
668         struct dst_entry        *dst_cache;     /* destination cache entry */
669         u32                     dst_cookie;
670         union nf_inet_addr      dst_saddr;
671         struct rcu_head         rcu_head;
672 };
673 
674 /* The real server destination forwarding entry with ip address, port number,
675  * and so on.
676  */
677 struct ip_vs_dest {
678         struct list_head        n_list;   /* for the dests in the service */
679         struct hlist_node       d_list;   /* for table with all the dests */
680 
681         u16                     af;             /* address family */
682         __be16                  port;           /* port number of the server */
683         union nf_inet_addr      addr;           /* IP address of the server */
684         volatile unsigned int   flags;          /* dest status flags */
685         atomic_t                conn_flags;     /* flags to copy to conn */
686         atomic_t                weight;         /* server weight */
687 
688         atomic_t                refcnt;         /* reference counter */
689         struct ip_vs_stats      stats;          /* statistics */
690         unsigned long           idle_start;     /* start time, jiffies */
691 
692         /* connection counters and thresholds */
693         atomic_t                activeconns;    /* active connections */
694         atomic_t                inactconns;     /* inactive connections */
695         atomic_t                persistconns;   /* persistent connections */
696         __u32                   u_threshold;    /* upper threshold */
697         __u32                   l_threshold;    /* lower threshold */
698 
699         /* for destination cache */
700         spinlock_t              dst_lock;       /* lock of dst_cache */
701         struct ip_vs_dest_dst __rcu *dest_dst;  /* cached dst info */
702 
703         /* for virtual service */
704         struct ip_vs_service __rcu *svc;        /* service it belongs to */
705         __u16                   protocol;       /* which protocol (TCP/UDP) */
706         __be16                  vport;          /* virtual port number */
707         union nf_inet_addr      vaddr;          /* virtual IP address */
708         __u32                   vfwmark;        /* firewall mark of service */
709 
710         struct list_head        t_list;         /* in dest_trash */
711         unsigned int            in_rs_table:1;  /* we are in rs_table */
712 };
713 
714 /* The scheduler object */
715 struct ip_vs_scheduler {
716         struct list_head        n_list;         /* d-linked list head */
717         char                    *name;          /* scheduler name */
718         atomic_t                refcnt;         /* reference counter */
719         struct module           *module;        /* THIS_MODULE/NULL */
720 
721         /* scheduler initializing service */
722         int (*init_service)(struct ip_vs_service *svc);
723         /* scheduling service finish */
724         void (*done_service)(struct ip_vs_service *svc);
725         /* dest is linked */
726         int (*add_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
727         /* dest is unlinked */
728         int (*del_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
729         /* dest is updated */
730         int (*upd_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
731 
732         /* selecting a server from the given service */
733         struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc,
734                                        const struct sk_buff *skb,
735                                        struct ip_vs_iphdr *iph);
736 };
737 
738 /* The persistence engine object */
739 struct ip_vs_pe {
740         struct list_head        n_list;         /* d-linked list head */
741         char                    *name;          /* scheduler name */
742         atomic_t                refcnt;         /* reference counter */
743         struct module           *module;        /* THIS_MODULE/NULL */
744 
745         /* get the connection template, if any */
746         int (*fill_param)(struct ip_vs_conn_param *p, struct sk_buff *skb);
747         bool (*ct_match)(const struct ip_vs_conn_param *p,
748                          struct ip_vs_conn *ct);
749         u32 (*hashkey_raw)(const struct ip_vs_conn_param *p, u32 initval,
750                            bool inverse);
751         int (*show_pe_data)(const struct ip_vs_conn *cp, char *buf);
752 };
753 
754 /* The application module object (a.k.a. app incarnation) */
755 struct ip_vs_app {
756         struct list_head        a_list;         /* member in app list */
757         int                     type;           /* IP_VS_APP_TYPE_xxx */
758         char                    *name;          /* application module name */
759         __u16                   protocol;
760         struct module           *module;        /* THIS_MODULE/NULL */
761         struct list_head        incs_list;      /* list of incarnations */
762 
763         /* members for application incarnations */
764         struct list_head        p_list;         /* member in proto app list */
765         struct ip_vs_app        *app;           /* its real application */
766         __be16                  port;           /* port number in net order */
767         atomic_t                usecnt;         /* usage counter */
768         struct rcu_head         rcu_head;
769 
770         /* output hook: Process packet in inout direction, diff set for TCP.
771          * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
772          *         2=Mangled but checksum was not updated
773          */
774         int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *,
775                        struct sk_buff *, int *diff);
776 
777         /* input hook: Process packet in outin direction, diff set for TCP.
778          * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
779          *         2=Mangled but checksum was not updated
780          */
781         int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *,
782                       struct sk_buff *, int *diff);
783 
784         /* ip_vs_app initializer */
785         int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *);
786 
787         /* ip_vs_app finish */
788         int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *);
789 
790 
791         /* not used now */
792         int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *,
793                          struct ip_vs_protocol *);
794 
795         void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *);
796 
797         int *                   timeout_table;
798         int *                   timeouts;
799         int                     timeouts_size;
800 
801         int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app,
802                              int *verdict, struct ip_vs_conn **cpp);
803 
804         struct ip_vs_conn *
805         (*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app,
806                        const struct iphdr *iph, int inverse);
807 
808         struct ip_vs_conn *
809         (*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app,
810                         const struct iphdr *iph, int inverse);
811 
812         int (*state_transition)(struct ip_vs_conn *cp, int direction,
813                                 const struct sk_buff *skb,
814                                 struct ip_vs_app *app);
815 
816         void (*timeout_change)(struct ip_vs_app *app, int flags);
817 };
818 
819 struct ipvs_master_sync_state {
820         struct list_head        sync_queue;
821         struct ip_vs_sync_buff  *sync_buff;
822         unsigned long           sync_queue_len;
823         unsigned int            sync_queue_delay;
824         struct task_struct      *master_thread;
825         struct delayed_work     master_wakeup_work;
826         struct netns_ipvs       *ipvs;
827 };
828 
829 /* How much time to keep dests in trash */
830 #define IP_VS_DEST_TRASH_PERIOD         (120 * HZ)
831 
832 /* IPVS in network namespace */
833 struct netns_ipvs {
834         int                     gen;            /* Generation */
835         int                     enable;         /* enable like nf_hooks do */
836         /* Hash table: for real service lookups */
837         #define IP_VS_RTAB_BITS 4
838         #define IP_VS_RTAB_SIZE (1 << IP_VS_RTAB_BITS)
839         #define IP_VS_RTAB_MASK (IP_VS_RTAB_SIZE - 1)
840 
841         struct hlist_head       rs_table[IP_VS_RTAB_SIZE];
842         /* ip_vs_app */
843         struct list_head        app_list;
844         /* ip_vs_proto */
845         #define IP_VS_PROTO_TAB_SIZE    32      /* must be power of 2 */
846         struct ip_vs_proto_data *proto_data_table[IP_VS_PROTO_TAB_SIZE];
847         /* ip_vs_proto_tcp */
848 #ifdef CONFIG_IP_VS_PROTO_TCP
849         #define TCP_APP_TAB_BITS        4
850         #define TCP_APP_TAB_SIZE        (1 << TCP_APP_TAB_BITS)
851         #define TCP_APP_TAB_MASK        (TCP_APP_TAB_SIZE - 1)
852         struct list_head        tcp_apps[TCP_APP_TAB_SIZE];
853 #endif
854         /* ip_vs_proto_udp */
855 #ifdef CONFIG_IP_VS_PROTO_UDP
856         #define UDP_APP_TAB_BITS        4
857         #define UDP_APP_TAB_SIZE        (1 << UDP_APP_TAB_BITS)
858         #define UDP_APP_TAB_MASK        (UDP_APP_TAB_SIZE - 1)
859         struct list_head        udp_apps[UDP_APP_TAB_SIZE];
860 #endif
861         /* ip_vs_proto_sctp */
862 #ifdef CONFIG_IP_VS_PROTO_SCTP
863         #define SCTP_APP_TAB_BITS       4
864         #define SCTP_APP_TAB_SIZE       (1 << SCTP_APP_TAB_BITS)
865         #define SCTP_APP_TAB_MASK       (SCTP_APP_TAB_SIZE - 1)
866         /* Hash table for SCTP application incarnations  */
867         struct list_head        sctp_apps[SCTP_APP_TAB_SIZE];
868 #endif
869         /* ip_vs_conn */
870         atomic_t                conn_count;      /* connection counter */
871 
872         /* ip_vs_ctl */
873         struct ip_vs_stats              tot_stats;  /* Statistics & est. */
874 
875         int                     num_services;    /* no of virtual services */
876 
877         /* Trash for destinations */
878         struct list_head        dest_trash;
879         spinlock_t              dest_trash_lock;
880         struct timer_list       dest_trash_timer; /* expiration timer */
881         /* Service counters */
882         atomic_t                ftpsvc_counter;
883         atomic_t                nullsvc_counter;
884 
885 #ifdef CONFIG_SYSCTL
886         /* 1/rate drop and drop-entry variables */
887         struct delayed_work     defense_work;   /* Work handler */
888         int                     drop_rate;
889         int                     drop_counter;
890         atomic_t                dropentry;
891         /* locks in ctl.c */
892         spinlock_t              dropentry_lock;  /* drop entry handling */
893         spinlock_t              droppacket_lock; /* drop packet handling */
894         spinlock_t              securetcp_lock;  /* state and timeout tables */
895 
896         /* sys-ctl struct */
897         struct ctl_table_header *sysctl_hdr;
898         struct ctl_table        *sysctl_tbl;
899 #endif
900 
901         /* sysctl variables */
902         int                     sysctl_amemthresh;
903         int                     sysctl_am_droprate;
904         int                     sysctl_drop_entry;
905         int                     sysctl_drop_packet;
906         int                     sysctl_secure_tcp;
907 #ifdef CONFIG_IP_VS_NFCT
908         int                     sysctl_conntrack;
909 #endif
910         int                     sysctl_snat_reroute;
911         int                     sysctl_sync_ver;
912         int                     sysctl_sync_ports;
913         int                     sysctl_sync_persist_mode;
914         unsigned long           sysctl_sync_qlen_max;
915         int                     sysctl_sync_sock_size;
916         int                     sysctl_cache_bypass;
917         int                     sysctl_expire_nodest_conn;
918         int                     sysctl_sloppy_tcp;
919         int                     sysctl_sloppy_sctp;
920         int                     sysctl_expire_quiescent_template;
921         int                     sysctl_sync_threshold[2];
922         unsigned int            sysctl_sync_refresh_period;
923         int                     sysctl_sync_retries;
924         int                     sysctl_nat_icmp_send;
925         int                     sysctl_pmtu_disc;
926         int                     sysctl_backup_only;
927 
928         /* ip_vs_lblc */
929         int                     sysctl_lblc_expiration;
930         struct ctl_table_header *lblc_ctl_header;
931         struct ctl_table        *lblc_ctl_table;
932         /* ip_vs_lblcr */
933         int                     sysctl_lblcr_expiration;
934         struct ctl_table_header *lblcr_ctl_header;
935         struct ctl_table        *lblcr_ctl_table;
936         /* ip_vs_est */
937         struct list_head        est_list;       /* estimator list */
938         spinlock_t              est_lock;
939         struct timer_list       est_timer;      /* Estimation timer */
940         /* ip_vs_sync */
941         spinlock_t              sync_lock;
942         struct ipvs_master_sync_state *ms;
943         spinlock_t              sync_buff_lock;
944         struct task_struct      **backup_threads;
945         int                     threads_mask;
946         int                     send_mesg_maxlen;
947         int                     recv_mesg_maxlen;
948         volatile int            sync_state;
949         volatile int            master_syncid;
950         volatile int            backup_syncid;
951         struct mutex            sync_mutex;
952         /* multicast interface name */
953         char                    master_mcast_ifn[IP_VS_IFNAME_MAXLEN];
954         char                    backup_mcast_ifn[IP_VS_IFNAME_MAXLEN];
955         /* net name space ptr */
956         struct net              *net;            /* Needed by timer routines */
957         /* Number of heterogeneous destinations, needed becaus heterogeneous
958          * are not supported when synchronization is enabled.
959          */
960         unsigned int            mixed_address_family_dests;
961 };
962 
963 #define DEFAULT_SYNC_THRESHOLD  3
964 #define DEFAULT_SYNC_PERIOD     50
965 #define DEFAULT_SYNC_VER        1
966 #define DEFAULT_SLOPPY_TCP      0
967 #define DEFAULT_SLOPPY_SCTP     0
968 #define DEFAULT_SYNC_REFRESH_PERIOD     (0U * HZ)
969 #define DEFAULT_SYNC_RETRIES            0
970 #define IPVS_SYNC_WAKEUP_RATE   8
971 #define IPVS_SYNC_QLEN_MAX      (IPVS_SYNC_WAKEUP_RATE * 4)
972 #define IPVS_SYNC_SEND_DELAY    (HZ / 50)
973 #define IPVS_SYNC_CHECK_PERIOD  HZ
974 #define IPVS_SYNC_FLUSH_TIME    (HZ * 2)
975 #define IPVS_SYNC_PORTS_MAX     (1 << 6)
976 
977 #ifdef CONFIG_SYSCTL
978 
979 static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
980 {
981         return ipvs->sysctl_sync_threshold[0];
982 }
983 
984 static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
985 {
986         return ACCESS_ONCE(ipvs->sysctl_sync_threshold[1]);
987 }
988 
989 static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
990 {
991         return ACCESS_ONCE(ipvs->sysctl_sync_refresh_period);
992 }
993 
994 static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
995 {
996         return ipvs->sysctl_sync_retries;
997 }
998 
999 static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
1000 {
1001         return ipvs->sysctl_sync_ver;
1002 }
1003 
1004 static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs)
1005 {
1006         return ipvs->sysctl_sloppy_tcp;
1007 }
1008 
1009 static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs)
1010 {
1011         return ipvs->sysctl_sloppy_sctp;
1012 }
1013 
1014 static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
1015 {
1016         return ACCESS_ONCE(ipvs->sysctl_sync_ports);
1017 }
1018 
1019 static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs)
1020 {
1021         return ipvs->sysctl_sync_persist_mode;
1022 }
1023 
1024 static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
1025 {
1026         return ipvs->sysctl_sync_qlen_max;
1027 }
1028 
1029 static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
1030 {
1031         return ipvs->sysctl_sync_sock_size;
1032 }
1033 
1034 static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
1035 {
1036         return ipvs->sysctl_pmtu_disc;
1037 }
1038 
1039 static inline int sysctl_backup_only(struct netns_ipvs *ipvs)
1040 {
1041         return ipvs->sync_state & IP_VS_STATE_BACKUP &&
1042                ipvs->sysctl_backup_only;
1043 }
1044 
1045 #else
1046 
1047 static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
1048 {
1049         return DEFAULT_SYNC_THRESHOLD;
1050 }
1051 
1052 static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
1053 {
1054         return DEFAULT_SYNC_PERIOD;
1055 }
1056 
1057 static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
1058 {
1059         return DEFAULT_SYNC_REFRESH_PERIOD;
1060 }
1061 
1062 static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
1063 {
1064         return DEFAULT_SYNC_RETRIES & 3;
1065 }
1066 
1067 static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
1068 {
1069         return DEFAULT_SYNC_VER;
1070 }
1071 
1072 static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs)
1073 {
1074         return DEFAULT_SLOPPY_TCP;
1075 }
1076 
1077 static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs)
1078 {
1079         return DEFAULT_SLOPPY_SCTP;
1080 }
1081 
1082 static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
1083 {
1084         return 1;
1085 }
1086 
1087 static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs)
1088 {
1089         return 0;
1090 }
1091 
1092 static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
1093 {
1094         return IPVS_SYNC_QLEN_MAX;
1095 }
1096 
1097 static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
1098 {
1099         return 0;
1100 }
1101 
1102 static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
1103 {
1104         return 1;
1105 }
1106 
1107 static inline int sysctl_backup_only(struct netns_ipvs *ipvs)
1108 {
1109         return 0;
1110 }
1111 
1112 #endif
1113 
1114 /* IPVS core functions
1115  * (from ip_vs_core.c)
1116  */
1117 const char *ip_vs_proto_name(unsigned int proto);
1118 void ip_vs_init_hash_table(struct list_head *table, int rows);
1119 #define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table((t), ARRAY_SIZE((t)))
1120 
1121 #define IP_VS_APP_TYPE_FTP      1
1122 
1123 /* ip_vs_conn handling functions
1124  * (from ip_vs_conn.c)
1125  */
1126 enum {
1127         IP_VS_DIR_INPUT = 0,
1128         IP_VS_DIR_OUTPUT,
1129         IP_VS_DIR_INPUT_ONLY,
1130         IP_VS_DIR_LAST,
1131 };
1132 
1133 static inline void ip_vs_conn_fill_param(struct net *net, int af, int protocol,
1134                                          const union nf_inet_addr *caddr,
1135                                          __be16 cport,
1136                                          const union nf_inet_addr *vaddr,
1137                                          __be16 vport,
1138                                          struct ip_vs_conn_param *p)
1139 {
1140         p->net = net;
1141         p->af = af;
1142         p->protocol = protocol;
1143         p->caddr = caddr;
1144         p->cport = cport;
1145         p->vaddr = vaddr;
1146         p->vport = vport;
1147         p->pe = NULL;
1148         p->pe_data = NULL;
1149 }
1150 
1151 struct ip_vs_conn *ip_vs_conn_in_get(const struct ip_vs_conn_param *p);
1152 struct ip_vs_conn *ip_vs_ct_in_get(const struct ip_vs_conn_param *p);
1153 
1154 struct ip_vs_conn * ip_vs_conn_in_get_proto(int af, const struct sk_buff *skb,
1155                                             const struct ip_vs_iphdr *iph,
1156                                             int inverse);
1157 
1158 struct ip_vs_conn *ip_vs_conn_out_get(const struct ip_vs_conn_param *p);
1159 
1160 struct ip_vs_conn * ip_vs_conn_out_get_proto(int af, const struct sk_buff *skb,
1161                                              const struct ip_vs_iphdr *iph,
1162                                              int inverse);
1163 
1164 /* Get reference to gain full access to conn.
1165  * By default, RCU read-side critical sections have access only to
1166  * conn fields and its PE data, see ip_vs_conn_rcu_free() for reference.
1167  */
1168 static inline bool __ip_vs_conn_get(struct ip_vs_conn *cp)
1169 {
1170         return atomic_inc_not_zero(&cp->refcnt);
1171 }
1172 
1173 /* put back the conn without restarting its timer */
1174 static inline void __ip_vs_conn_put(struct ip_vs_conn *cp)
1175 {
1176         smp_mb__before_atomic();
1177         atomic_dec(&cp->refcnt);
1178 }
1179 void ip_vs_conn_put(struct ip_vs_conn *cp);
1180 void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport);
1181 
1182 struct ip_vs_conn *ip_vs_conn_new(const struct ip_vs_conn_param *p, int dest_af,
1183                                   const union nf_inet_addr *daddr,
1184                                   __be16 dport, unsigned int flags,
1185                                   struct ip_vs_dest *dest, __u32 fwmark);
1186 void ip_vs_conn_expire_now(struct ip_vs_conn *cp);
1187 
1188 const char *ip_vs_state_name(__u16 proto, int state);
1189 
1190 void ip_vs_tcp_conn_listen(struct net *net, struct ip_vs_conn *cp);
1191 int ip_vs_check_template(struct ip_vs_conn *ct);
1192 void ip_vs_random_dropentry(struct net *net);
1193 int ip_vs_conn_init(void);
1194 void ip_vs_conn_cleanup(void);
1195 
1196 static inline void ip_vs_control_del(struct ip_vs_conn *cp)
1197 {
1198         struct ip_vs_conn *ctl_cp = cp->control;
1199         if (!ctl_cp) {
1200                 IP_VS_ERR_BUF("request control DEL for uncontrolled: "
1201                               "%s:%d to %s:%d\n",
1202                               IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1203                               ntohs(cp->cport),
1204                               IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1205                               ntohs(cp->vport));
1206 
1207                 return;
1208         }
1209 
1210         IP_VS_DBG_BUF(7, "DELeting control for: "
1211                       "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1212                       IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1213                       ntohs(cp->cport),
1214                       IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1215                       ntohs(ctl_cp->cport));
1216 
1217         cp->control = NULL;
1218         if (atomic_read(&ctl_cp->n_control) == 0) {
1219                 IP_VS_ERR_BUF("BUG control DEL with n=0 : "
1220                               "%s:%d to %s:%d\n",
1221                               IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1222                               ntohs(cp->cport),
1223                               IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1224                               ntohs(cp->vport));
1225 
1226                 return;
1227         }
1228         atomic_dec(&ctl_cp->n_control);
1229 }
1230 
1231 static inline void
1232 ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp)
1233 {
1234         if (cp->control) {
1235                 IP_VS_ERR_BUF("request control ADD for already controlled: "
1236                               "%s:%d to %s:%d\n",
1237                               IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1238                               ntohs(cp->cport),
1239                               IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1240                               ntohs(cp->vport));
1241 
1242                 ip_vs_control_del(cp);
1243         }
1244 
1245         IP_VS_DBG_BUF(7, "ADDing control for: "
1246                       "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1247                       IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1248                       ntohs(cp->cport),
1249                       IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1250                       ntohs(ctl_cp->cport));
1251 
1252         cp->control = ctl_cp;
1253         atomic_inc(&ctl_cp->n_control);
1254 }
1255 
1256 /* IPVS netns init & cleanup functions */
1257 int ip_vs_estimator_net_init(struct net *net);
1258 int ip_vs_control_net_init(struct net *net);
1259 int ip_vs_protocol_net_init(struct net *net);
1260 int ip_vs_app_net_init(struct net *net);
1261 int ip_vs_conn_net_init(struct net *net);
1262 int ip_vs_sync_net_init(struct net *net);
1263 void ip_vs_conn_net_cleanup(struct net *net);
1264 void ip_vs_app_net_cleanup(struct net *net);
1265 void ip_vs_protocol_net_cleanup(struct net *net);
1266 void ip_vs_control_net_cleanup(struct net *net);
1267 void ip_vs_estimator_net_cleanup(struct net *net);
1268 void ip_vs_sync_net_cleanup(struct net *net);
1269 void ip_vs_service_net_cleanup(struct net *net);
1270 
1271 /* IPVS application functions
1272  * (from ip_vs_app.c)
1273  */
1274 #define IP_VS_APP_MAX_PORTS  8
1275 struct ip_vs_app *register_ip_vs_app(struct net *net, struct ip_vs_app *app);
1276 void unregister_ip_vs_app(struct net *net, struct ip_vs_app *app);
1277 int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1278 void ip_vs_unbind_app(struct ip_vs_conn *cp);
1279 int register_ip_vs_app_inc(struct net *net, struct ip_vs_app *app, __u16 proto,
1280                            __u16 port);
1281 int ip_vs_app_inc_get(struct ip_vs_app *inc);
1282 void ip_vs_app_inc_put(struct ip_vs_app *inc);
1283 
1284 int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb);
1285 int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb);
1286 
1287 int register_ip_vs_pe(struct ip_vs_pe *pe);
1288 int unregister_ip_vs_pe(struct ip_vs_pe *pe);
1289 struct ip_vs_pe *ip_vs_pe_getbyname(const char *name);
1290 struct ip_vs_pe *__ip_vs_pe_getbyname(const char *pe_name);
1291 
1292 /* Use a #define to avoid all of module.h just for these trivial ops */
1293 #define ip_vs_pe_get(pe)                        \
1294         if (pe && pe->module)                   \
1295                 __module_get(pe->module);
1296 
1297 #define ip_vs_pe_put(pe)                        \
1298         if (pe && pe->module)                   \
1299                 module_put(pe->module);
1300 
1301 /* IPVS protocol functions (from ip_vs_proto.c) */
1302 int ip_vs_protocol_init(void);
1303 void ip_vs_protocol_cleanup(void);
1304 void ip_vs_protocol_timeout_change(struct netns_ipvs *ipvs, int flags);
1305 int *ip_vs_create_timeout_table(int *table, int size);
1306 int ip_vs_set_state_timeout(int *table, int num, const char *const *names,
1307                             const char *name, int to);
1308 void ip_vs_tcpudp_debug_packet(int af, struct ip_vs_protocol *pp,
1309                                const struct sk_buff *skb, int offset,
1310                                const char *msg);
1311 
1312 extern struct ip_vs_protocol ip_vs_protocol_tcp;
1313 extern struct ip_vs_protocol ip_vs_protocol_udp;
1314 extern struct ip_vs_protocol ip_vs_protocol_icmp;
1315 extern struct ip_vs_protocol ip_vs_protocol_esp;
1316 extern struct ip_vs_protocol ip_vs_protocol_ah;
1317 extern struct ip_vs_protocol ip_vs_protocol_sctp;
1318 
1319 /* Registering/unregistering scheduler functions
1320  * (from ip_vs_sched.c)
1321  */
1322 int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1323 int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1324 int ip_vs_bind_scheduler(struct ip_vs_service *svc,
1325                          struct ip_vs_scheduler *scheduler);
1326 void ip_vs_unbind_scheduler(struct ip_vs_service *svc,
1327                             struct ip_vs_scheduler *sched);
1328 struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name);
1329 void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler);
1330 struct ip_vs_conn *
1331 ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb,
1332                struct ip_vs_proto_data *pd, int *ignored,
1333                struct ip_vs_iphdr *iph);
1334 int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
1335                 struct ip_vs_proto_data *pd, struct ip_vs_iphdr *iph);
1336 
1337 void ip_vs_scheduler_err(struct ip_vs_service *svc, const char *msg);
1338 
1339 /* IPVS control data and functions (from ip_vs_ctl.c) */
1340 extern struct ip_vs_stats ip_vs_stats;
1341 extern int sysctl_ip_vs_sync_ver;
1342 
1343 struct ip_vs_service *
1344 ip_vs_service_find(struct net *net, int af, __u32 fwmark, __u16 protocol,
1345                   const union nf_inet_addr *vaddr, __be16 vport);
1346 
1347 bool ip_vs_has_real_service(struct net *net, int af, __u16 protocol,
1348                             const union nf_inet_addr *daddr, __be16 dport);
1349 
1350 int ip_vs_use_count_inc(void);
1351 void ip_vs_use_count_dec(void);
1352 int ip_vs_register_nl_ioctl(void);
1353 void ip_vs_unregister_nl_ioctl(void);
1354 int ip_vs_control_init(void);
1355 void ip_vs_control_cleanup(void);
1356 struct ip_vs_dest *
1357 ip_vs_find_dest(struct net *net, int svc_af, int dest_af,
1358                 const union nf_inet_addr *daddr, __be16 dport,
1359                 const union nf_inet_addr *vaddr, __be16 vport,
1360                 __u16 protocol, __u32 fwmark, __u32 flags);
1361 void ip_vs_try_bind_dest(struct ip_vs_conn *cp);
1362 
1363 static inline void ip_vs_dest_hold(struct ip_vs_dest *dest)
1364 {
1365         atomic_inc(&dest->refcnt);
1366 }
1367 
1368 static inline void ip_vs_dest_put(struct ip_vs_dest *dest)
1369 {
1370         smp_mb__before_atomic();
1371         atomic_dec(&dest->refcnt);
1372 }
1373 
1374 static inline void ip_vs_dest_put_and_free(struct ip_vs_dest *dest)
1375 {
1376         if (atomic_dec_return(&dest->refcnt) < 0)
1377                 kfree(dest);
1378 }
1379 
1380 /* IPVS sync daemon data and function prototypes
1381  * (from ip_vs_sync.c)
1382  */
1383 int start_sync_thread(struct net *net, int state, char *mcast_ifn, __u8 syncid);
1384 int stop_sync_thread(struct net *net, int state);
1385 void ip_vs_sync_conn(struct net *net, struct ip_vs_conn *cp, int pkts);
1386 
1387 /* IPVS rate estimator prototypes (from ip_vs_est.c) */
1388 void ip_vs_start_estimator(struct net *net, struct ip_vs_stats *stats);
1389 void ip_vs_stop_estimator(struct net *net, struct ip_vs_stats *stats);
1390 void ip_vs_zero_estimator(struct ip_vs_stats *stats);
1391 void ip_vs_read_estimator(struct ip_vs_stats_user *dst,
1392                           struct ip_vs_stats *stats);
1393 
1394 /* Various IPVS packet transmitters (from ip_vs_xmit.c) */
1395 int ip_vs_null_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1396                     struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1397 int ip_vs_bypass_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1398                       struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1399 int ip_vs_nat_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1400                    struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1401 int ip_vs_tunnel_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1402                       struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1403 int ip_vs_dr_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1404                   struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1405 int ip_vs_icmp_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1406                     struct ip_vs_protocol *pp, int offset,
1407                     unsigned int hooknum, struct ip_vs_iphdr *iph);
1408 void ip_vs_dest_dst_rcu_free(struct rcu_head *head);
1409 
1410 #ifdef CONFIG_IP_VS_IPV6
1411 int ip_vs_bypass_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1412                          struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1413 int ip_vs_nat_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1414                       struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1415 int ip_vs_tunnel_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1416                          struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1417 int ip_vs_dr_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1418                      struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1419 int ip_vs_icmp_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1420                        struct ip_vs_protocol *pp, int offset,
1421                        unsigned int hooknum, struct ip_vs_iphdr *iph);
1422 #endif
1423 
1424 #ifdef CONFIG_SYSCTL
1425 /* This is a simple mechanism to ignore packets when
1426  * we are loaded. Just set ip_vs_drop_rate to 'n' and
1427  * we start to drop 1/rate of the packets
1428  */
1429 static inline int ip_vs_todrop(struct netns_ipvs *ipvs)
1430 {
1431         if (!ipvs->drop_rate)
1432                 return 0;
1433         if (--ipvs->drop_counter > 0)
1434                 return 0;
1435         ipvs->drop_counter = ipvs->drop_rate;
1436         return 1;
1437 }
1438 #else
1439 static inline int ip_vs_todrop(struct netns_ipvs *ipvs) { return 0; }
1440 #endif
1441 
1442 /* ip_vs_fwd_tag returns the forwarding tag of the connection */
1443 #define IP_VS_FWD_METHOD(cp)  (cp->flags & IP_VS_CONN_F_FWD_MASK)
1444 
1445 static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp)
1446 {
1447         char fwd;
1448 
1449         switch (IP_VS_FWD_METHOD(cp)) {
1450         case IP_VS_CONN_F_MASQ:
1451                 fwd = 'M'; break;
1452         case IP_VS_CONN_F_LOCALNODE:
1453                 fwd = 'L'; break;
1454         case IP_VS_CONN_F_TUNNEL:
1455                 fwd = 'T'; break;
1456         case IP_VS_CONN_F_DROUTE:
1457                 fwd = 'R'; break;
1458         case IP_VS_CONN_F_BYPASS:
1459                 fwd = 'B'; break;
1460         default:
1461                 fwd = '?'; break;
1462         }
1463         return fwd;
1464 }
1465 
1466 void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp,
1467                     struct ip_vs_conn *cp, int dir);
1468 
1469 #ifdef CONFIG_IP_VS_IPV6
1470 void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp,
1471                        struct ip_vs_conn *cp, int dir);
1472 #endif
1473 
1474 __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset);
1475 
1476 static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum)
1477 {
1478         __be32 diff[2] = { ~old, new };
1479 
1480         return csum_partial(diff, sizeof(diff), oldsum);
1481 }
1482 
1483 #ifdef CONFIG_IP_VS_IPV6
1484 static inline __wsum ip_vs_check_diff16(const __be32 *old, const __be32 *new,
1485                                         __wsum oldsum)
1486 {
1487         __be32 diff[8] = { ~old[3], ~old[2], ~old[1], ~old[0],
1488                             new[3],  new[2],  new[1],  new[0] };
1489 
1490         return csum_partial(diff, sizeof(diff), oldsum);
1491 }
1492 #endif
1493 
1494 static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum)
1495 {
1496         __be16 diff[2] = { ~old, new };
1497 
1498         return csum_partial(diff, sizeof(diff), oldsum);
1499 }
1500 
1501 /* Forget current conntrack (unconfirmed) and attach notrack entry */
1502 static inline void ip_vs_notrack(struct sk_buff *skb)
1503 {
1504 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
1505         enum ip_conntrack_info ctinfo;
1506         struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
1507 
1508         if (!ct || !nf_ct_is_untracked(ct)) {
1509                 nf_conntrack_put(skb->nfct);
1510                 skb->nfct = &nf_ct_untracked_get()->ct_general;
1511                 skb->nfctinfo = IP_CT_NEW;
1512                 nf_conntrack_get(skb->nfct);
1513         }
1514 #endif
1515 }
1516 
1517 #ifdef CONFIG_IP_VS_NFCT
1518 /* Netfilter connection tracking
1519  * (from ip_vs_nfct.c)
1520  */
1521 static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1522 {
1523 #ifdef CONFIG_SYSCTL
1524         return ipvs->sysctl_conntrack;
1525 #else
1526         return 0;
1527 #endif
1528 }
1529 
1530 void ip_vs_update_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp,
1531                             int outin);
1532 int ip_vs_confirm_conntrack(struct sk_buff *skb);
1533 void ip_vs_nfct_expect_related(struct sk_buff *skb, struct nf_conn *ct,
1534                                struct ip_vs_conn *cp, u_int8_t proto,
1535                                const __be16 port, int from_rs);
1536 void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp);
1537 
1538 #else
1539 
1540 static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1541 {
1542         return 0;
1543 }
1544 
1545 static inline void ip_vs_update_conntrack(struct sk_buff *skb,
1546                                           struct ip_vs_conn *cp, int outin)
1547 {
1548 }
1549 
1550 static inline int ip_vs_confirm_conntrack(struct sk_buff *skb)
1551 {
1552         return NF_ACCEPT;
1553 }
1554 
1555 static inline void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp)
1556 {
1557 }
1558 #endif /* CONFIG_IP_VS_NFCT */
1559 
1560 static inline int
1561 ip_vs_dest_conn_overhead(struct ip_vs_dest *dest)
1562 {
1563         /* We think the overhead of processing active connections is 256
1564          * times higher than that of inactive connections in average. (This
1565          * 256 times might not be accurate, we will change it later) We
1566          * use the following formula to estimate the overhead now:
1567          *                dest->activeconns*256 + dest->inactconns
1568          */
1569         return (atomic_read(&dest->activeconns) << 8) +
1570                 atomic_read(&dest->inactconns);
1571 }
1572 
1573 #endif  /* _NET_IP_VS_H */
1574 

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