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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 && dev_net(skb->dev)))
 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 && sock_net(skb->sk)))
 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 && sock_net(skb->sk)))
 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 && dev_net(skb->dev)))
 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         __u64           conns;          /* connections scheduled */
369         __u64           inpkts;         /* incoming packets */
370         __u64           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   cnt;
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         u64                     last_conns;
387         u64                     last_inpkts;
388         u64                     last_outpkts;
389 
390         u64                     cps;
391         u64                     inpps;
392         u64                     outpps;
393         u64                     inbps;
394         u64                     outbps;
395 };
396 
397 /*
398  * IPVS statistics object, 64-bit kernel version of struct ip_vs_stats_user
399  */
400 struct ip_vs_kstats {
401         u64                     conns;          /* connections scheduled */
402         u64                     inpkts;         /* incoming packets */
403         u64                     outpkts;        /* outgoing packets */
404         u64                     inbytes;        /* incoming bytes */
405         u64                     outbytes;       /* outgoing bytes */
406 
407         u64                     cps;            /* current connection rate */
408         u64                     inpps;          /* current in packet rate */
409         u64                     outpps;         /* current out packet rate */
410         u64                     inbps;          /* current in byte rate */
411         u64                     outbps;         /* current out byte rate */
412 };
413 
414 struct ip_vs_stats {
415         struct ip_vs_kstats     kstats;         /* kernel statistics */
416         struct ip_vs_estimator  est;            /* estimator */
417         struct ip_vs_cpu_stats __percpu *cpustats;      /* per cpu counters */
418         spinlock_t              lock;           /* spin lock */
419         struct ip_vs_kstats     kstats0;        /* reset values */
420 };
421 
422 struct dst_entry;
423 struct iphdr;
424 struct ip_vs_conn;
425 struct ip_vs_app;
426 struct sk_buff;
427 struct ip_vs_proto_data;
428 
429 struct ip_vs_protocol {
430         struct ip_vs_protocol   *next;
431         char                    *name;
432         u16                     protocol;
433         u16                     num_states;
434         int                     dont_defrag;
435 
436         void (*init)(struct ip_vs_protocol *pp);
437 
438         void (*exit)(struct ip_vs_protocol *pp);
439 
440         int (*init_netns)(struct net *net, struct ip_vs_proto_data *pd);
441 
442         void (*exit_netns)(struct net *net, struct ip_vs_proto_data *pd);
443 
444         int (*conn_schedule)(int af, struct sk_buff *skb,
445                              struct ip_vs_proto_data *pd,
446                              int *verdict, struct ip_vs_conn **cpp,
447                              struct ip_vs_iphdr *iph);
448 
449         struct ip_vs_conn *
450         (*conn_in_get)(int af,
451                        const struct sk_buff *skb,
452                        const struct ip_vs_iphdr *iph,
453                        int inverse);
454 
455         struct ip_vs_conn *
456         (*conn_out_get)(int af,
457                         const struct sk_buff *skb,
458                         const struct ip_vs_iphdr *iph,
459                         int inverse);
460 
461         int (*snat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp,
462                             struct ip_vs_conn *cp, struct ip_vs_iphdr *iph);
463 
464         int (*dnat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp,
465                             struct ip_vs_conn *cp, struct ip_vs_iphdr *iph);
466 
467         int (*csum_check)(int af, struct sk_buff *skb,
468                           struct ip_vs_protocol *pp);
469 
470         const char *(*state_name)(int state);
471 
472         void (*state_transition)(struct ip_vs_conn *cp, int direction,
473                                  const struct sk_buff *skb,
474                                  struct ip_vs_proto_data *pd);
475 
476         int (*register_app)(struct net *net, struct ip_vs_app *inc);
477 
478         void (*unregister_app)(struct net *net, struct ip_vs_app *inc);
479 
480         int (*app_conn_bind)(struct ip_vs_conn *cp);
481 
482         void (*debug_packet)(int af, struct ip_vs_protocol *pp,
483                              const struct sk_buff *skb,
484                              int offset,
485                              const char *msg);
486 
487         void (*timeout_change)(struct ip_vs_proto_data *pd, int flags);
488 };
489 
490 /* protocol data per netns */
491 struct ip_vs_proto_data {
492         struct ip_vs_proto_data *next;
493         struct ip_vs_protocol   *pp;
494         int                     *timeout_table; /* protocol timeout table */
495         atomic_t                appcnt;         /* counter of proto app incs. */
496         struct tcp_states_t     *tcp_state_table;
497 };
498 
499 struct ip_vs_protocol   *ip_vs_proto_get(unsigned short proto);
500 struct ip_vs_proto_data *ip_vs_proto_data_get(struct net *net,
501                                               unsigned short proto);
502 
503 struct ip_vs_conn_param {
504         struct net                      *net;
505         const union nf_inet_addr        *caddr;
506         const union nf_inet_addr        *vaddr;
507         __be16                          cport;
508         __be16                          vport;
509         __u16                           protocol;
510         u16                             af;
511 
512         const struct ip_vs_pe           *pe;
513         char                            *pe_data;
514         __u8                            pe_data_len;
515 };
516 
517 /* IP_VS structure allocated for each dynamically scheduled connection */
518 struct ip_vs_conn {
519         struct hlist_node       c_list;         /* hashed list heads */
520         /* Protocol, addresses and port numbers */
521         __be16                  cport;
522         __be16                  dport;
523         __be16                  vport;
524         u16                     af;             /* address family */
525         union nf_inet_addr      caddr;          /* client address */
526         union nf_inet_addr      vaddr;          /* virtual address */
527         union nf_inet_addr      daddr;          /* destination address */
528         volatile __u32          flags;          /* status flags */
529         __u16                   protocol;       /* Which protocol (TCP/UDP) */
530         __u16                   daf;            /* Address family of the dest */
531 #ifdef CONFIG_NET_NS
532         struct net              *net;           /* Name space */
533 #endif
534 
535         /* counter and timer */
536         atomic_t                refcnt;         /* reference count */
537         struct timer_list       timer;          /* Expiration timer */
538         volatile unsigned long  timeout;        /* timeout */
539 
540         /* Flags and state transition */
541         spinlock_t              lock;           /* lock for state transition */
542         volatile __u16          state;          /* state info */
543         volatile __u16          old_state;      /* old state, to be used for
544                                                  * state transition triggerd
545                                                  * synchronization
546                                                  */
547         __u32                   fwmark;         /* Fire wall mark from skb */
548         unsigned long           sync_endtime;   /* jiffies + sent_retries */
549 
550         /* Control members */
551         struct ip_vs_conn       *control;       /* Master control connection */
552         atomic_t                n_control;      /* Number of controlled ones */
553         struct ip_vs_dest       *dest;          /* real server */
554         atomic_t                in_pkts;        /* incoming packet counter */
555 
556         /* Packet transmitter for different forwarding methods.  If it
557          * mangles the packet, it must return NF_DROP or better NF_STOLEN,
558          * otherwise this must be changed to a sk_buff **.
559          * NF_ACCEPT can be returned when destination is local.
560          */
561         int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp,
562                            struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
563 
564         /* Note: we can group the following members into a structure,
565          * in order to save more space, and the following members are
566          * only used in VS/NAT anyway
567          */
568         struct ip_vs_app        *app;           /* bound ip_vs_app object */
569         void                    *app_data;      /* Application private data */
570         struct ip_vs_seq        in_seq;         /* incoming seq. struct */
571         struct ip_vs_seq        out_seq;        /* outgoing seq. struct */
572 
573         const struct ip_vs_pe   *pe;
574         char                    *pe_data;
575         __u8                    pe_data_len;
576 
577         struct rcu_head         rcu_head;
578 };
579 
580 /* To save some memory in conn table when name space is disabled. */
581 static inline struct net *ip_vs_conn_net(const struct ip_vs_conn *cp)
582 {
583 #ifdef CONFIG_NET_NS
584         return cp->net;
585 #else
586         return &init_net;
587 #endif
588 }
589 
590 static inline void ip_vs_conn_net_set(struct ip_vs_conn *cp, struct net *net)
591 {
592 #ifdef CONFIG_NET_NS
593         cp->net = net;
594 #endif
595 }
596 
597 static inline int ip_vs_conn_net_eq(const struct ip_vs_conn *cp,
598                                     struct net *net)
599 {
600 #ifdef CONFIG_NET_NS
601         return cp->net == net;
602 #else
603         return 1;
604 #endif
605 }
606 
607 /* Extended internal versions of struct ip_vs_service_user and ip_vs_dest_user
608  * for IPv6 support.
609  *
610  * We need these to conveniently pass around service and destination
611  * options, but unfortunately, we also need to keep the old definitions to
612  * maintain userspace backwards compatibility for the setsockopt interface.
613  */
614 struct ip_vs_service_user_kern {
615         /* virtual service addresses */
616         u16                     af;
617         u16                     protocol;
618         union nf_inet_addr      addr;           /* virtual ip address */
619         __be16                  port;
620         u32                     fwmark;         /* firwall mark of service */
621 
622         /* virtual service options */
623         char                    *sched_name;
624         char                    *pe_name;
625         unsigned int            flags;          /* virtual service flags */
626         unsigned int            timeout;        /* persistent timeout in sec */
627         __be32                  netmask;        /* persistent netmask or plen */
628 };
629 
630 
631 struct ip_vs_dest_user_kern {
632         /* destination server address */
633         union nf_inet_addr      addr;
634         __be16                  port;
635 
636         /* real server options */
637         unsigned int            conn_flags;     /* connection flags */
638         int                     weight;         /* destination weight */
639 
640         /* thresholds for active connections */
641         u32                     u_threshold;    /* upper threshold */
642         u32                     l_threshold;    /* lower threshold */
643 
644         /* Address family of addr */
645         u16                     af;
646 };
647 
648 
649 /*
650  * The information about the virtual service offered to the net and the
651  * forwarding entries.
652  */
653 struct ip_vs_service {
654         struct hlist_node       s_list;   /* for normal service table */
655         struct hlist_node       f_list;   /* for fwmark-based service table */
656         atomic_t                refcnt;   /* reference counter */
657 
658         u16                     af;       /* address family */
659         __u16                   protocol; /* which protocol (TCP/UDP) */
660         union nf_inet_addr      addr;     /* IP address for virtual service */
661         __be16                  port;     /* port number for the service */
662         __u32                   fwmark;   /* firewall mark of the service */
663         unsigned int            flags;    /* service status flags */
664         unsigned int            timeout;  /* persistent timeout in ticks */
665         __be32                  netmask;  /* grouping granularity, mask/plen */
666         struct net              *net;
667 
668         struct list_head        destinations;  /* real server d-linked list */
669         __u32                   num_dests;     /* number of servers */
670         struct ip_vs_stats      stats;         /* statistics for the service */
671 
672         /* for scheduling */
673         struct ip_vs_scheduler __rcu *scheduler; /* bound scheduler object */
674         spinlock_t              sched_lock;    /* lock sched_data */
675         void                    *sched_data;   /* scheduler application data */
676 
677         /* alternate persistence engine */
678         struct ip_vs_pe __rcu   *pe;
679 
680         struct rcu_head         rcu_head;
681 };
682 
683 /* Information for cached dst */
684 struct ip_vs_dest_dst {
685         struct dst_entry        *dst_cache;     /* destination cache entry */
686         u32                     dst_cookie;
687         union nf_inet_addr      dst_saddr;
688         struct rcu_head         rcu_head;
689 };
690 
691 /* The real server destination forwarding entry with ip address, port number,
692  * and so on.
693  */
694 struct ip_vs_dest {
695         struct list_head        n_list;   /* for the dests in the service */
696         struct hlist_node       d_list;   /* for table with all the dests */
697 
698         u16                     af;             /* address family */
699         __be16                  port;           /* port number of the server */
700         union nf_inet_addr      addr;           /* IP address of the server */
701         volatile unsigned int   flags;          /* dest status flags */
702         atomic_t                conn_flags;     /* flags to copy to conn */
703         atomic_t                weight;         /* server weight */
704 
705         atomic_t                refcnt;         /* reference counter */
706         struct ip_vs_stats      stats;          /* statistics */
707         unsigned long           idle_start;     /* start time, jiffies */
708 
709         /* connection counters and thresholds */
710         atomic_t                activeconns;    /* active connections */
711         atomic_t                inactconns;     /* inactive connections */
712         atomic_t                persistconns;   /* persistent connections */
713         __u32                   u_threshold;    /* upper threshold */
714         __u32                   l_threshold;    /* lower threshold */
715 
716         /* for destination cache */
717         spinlock_t              dst_lock;       /* lock of dst_cache */
718         struct ip_vs_dest_dst __rcu *dest_dst;  /* cached dst info */
719 
720         /* for virtual service */
721         struct ip_vs_service __rcu *svc;        /* service it belongs to */
722         __u16                   protocol;       /* which protocol (TCP/UDP) */
723         __be16                  vport;          /* virtual port number */
724         union nf_inet_addr      vaddr;          /* virtual IP address */
725         __u32                   vfwmark;        /* firewall mark of service */
726 
727         struct list_head        t_list;         /* in dest_trash */
728         unsigned int            in_rs_table:1;  /* we are in rs_table */
729 };
730 
731 /* The scheduler object */
732 struct ip_vs_scheduler {
733         struct list_head        n_list;         /* d-linked list head */
734         char                    *name;          /* scheduler name */
735         atomic_t                refcnt;         /* reference counter */
736         struct module           *module;        /* THIS_MODULE/NULL */
737 
738         /* scheduler initializing service */
739         int (*init_service)(struct ip_vs_service *svc);
740         /* scheduling service finish */
741         void (*done_service)(struct ip_vs_service *svc);
742         /* dest is linked */
743         int (*add_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
744         /* dest is unlinked */
745         int (*del_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
746         /* dest is updated */
747         int (*upd_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
748 
749         /* selecting a server from the given service */
750         struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc,
751                                        const struct sk_buff *skb,
752                                        struct ip_vs_iphdr *iph);
753 };
754 
755 /* The persistence engine object */
756 struct ip_vs_pe {
757         struct list_head        n_list;         /* d-linked list head */
758         char                    *name;          /* scheduler name */
759         atomic_t                refcnt;         /* reference counter */
760         struct module           *module;        /* THIS_MODULE/NULL */
761 
762         /* get the connection template, if any */
763         int (*fill_param)(struct ip_vs_conn_param *p, struct sk_buff *skb);
764         bool (*ct_match)(const struct ip_vs_conn_param *p,
765                          struct ip_vs_conn *ct);
766         u32 (*hashkey_raw)(const struct ip_vs_conn_param *p, u32 initval,
767                            bool inverse);
768         int (*show_pe_data)(const struct ip_vs_conn *cp, char *buf);
769 };
770 
771 /* The application module object (a.k.a. app incarnation) */
772 struct ip_vs_app {
773         struct list_head        a_list;         /* member in app list */
774         int                     type;           /* IP_VS_APP_TYPE_xxx */
775         char                    *name;          /* application module name */
776         __u16                   protocol;
777         struct module           *module;        /* THIS_MODULE/NULL */
778         struct list_head        incs_list;      /* list of incarnations */
779 
780         /* members for application incarnations */
781         struct list_head        p_list;         /* member in proto app list */
782         struct ip_vs_app        *app;           /* its real application */
783         __be16                  port;           /* port number in net order */
784         atomic_t                usecnt;         /* usage counter */
785         struct rcu_head         rcu_head;
786 
787         /* output hook: Process packet in inout direction, diff set for TCP.
788          * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
789          *         2=Mangled but checksum was not updated
790          */
791         int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *,
792                        struct sk_buff *, int *diff);
793 
794         /* input hook: Process packet in outin direction, diff set for TCP.
795          * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
796          *         2=Mangled but checksum was not updated
797          */
798         int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *,
799                       struct sk_buff *, int *diff);
800 
801         /* ip_vs_app initializer */
802         int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *);
803 
804         /* ip_vs_app finish */
805         int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *);
806 
807 
808         /* not used now */
809         int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *,
810                          struct ip_vs_protocol *);
811 
812         void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *);
813 
814         int *                   timeout_table;
815         int *                   timeouts;
816         int                     timeouts_size;
817 
818         int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app,
819                              int *verdict, struct ip_vs_conn **cpp);
820 
821         struct ip_vs_conn *
822         (*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app,
823                        const struct iphdr *iph, int inverse);
824 
825         struct ip_vs_conn *
826         (*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app,
827                         const struct iphdr *iph, int inverse);
828 
829         int (*state_transition)(struct ip_vs_conn *cp, int direction,
830                                 const struct sk_buff *skb,
831                                 struct ip_vs_app *app);
832 
833         void (*timeout_change)(struct ip_vs_app *app, int flags);
834 };
835 
836 struct ipvs_master_sync_state {
837         struct list_head        sync_queue;
838         struct ip_vs_sync_buff  *sync_buff;
839         unsigned long           sync_queue_len;
840         unsigned int            sync_queue_delay;
841         struct task_struct      *master_thread;
842         struct delayed_work     master_wakeup_work;
843         struct netns_ipvs       *ipvs;
844 };
845 
846 /* How much time to keep dests in trash */
847 #define IP_VS_DEST_TRASH_PERIOD         (120 * HZ)
848 
849 /* IPVS in network namespace */
850 struct netns_ipvs {
851         int                     gen;            /* Generation */
852         int                     enable;         /* enable like nf_hooks do */
853         /* Hash table: for real service lookups */
854         #define IP_VS_RTAB_BITS 4
855         #define IP_VS_RTAB_SIZE (1 << IP_VS_RTAB_BITS)
856         #define IP_VS_RTAB_MASK (IP_VS_RTAB_SIZE - 1)
857 
858         struct hlist_head       rs_table[IP_VS_RTAB_SIZE];
859         /* ip_vs_app */
860         struct list_head        app_list;
861         /* ip_vs_proto */
862         #define IP_VS_PROTO_TAB_SIZE    32      /* must be power of 2 */
863         struct ip_vs_proto_data *proto_data_table[IP_VS_PROTO_TAB_SIZE];
864         /* ip_vs_proto_tcp */
865 #ifdef CONFIG_IP_VS_PROTO_TCP
866         #define TCP_APP_TAB_BITS        4
867         #define TCP_APP_TAB_SIZE        (1 << TCP_APP_TAB_BITS)
868         #define TCP_APP_TAB_MASK        (TCP_APP_TAB_SIZE - 1)
869         struct list_head        tcp_apps[TCP_APP_TAB_SIZE];
870 #endif
871         /* ip_vs_proto_udp */
872 #ifdef CONFIG_IP_VS_PROTO_UDP
873         #define UDP_APP_TAB_BITS        4
874         #define UDP_APP_TAB_SIZE        (1 << UDP_APP_TAB_BITS)
875         #define UDP_APP_TAB_MASK        (UDP_APP_TAB_SIZE - 1)
876         struct list_head        udp_apps[UDP_APP_TAB_SIZE];
877 #endif
878         /* ip_vs_proto_sctp */
879 #ifdef CONFIG_IP_VS_PROTO_SCTP
880         #define SCTP_APP_TAB_BITS       4
881         #define SCTP_APP_TAB_SIZE       (1 << SCTP_APP_TAB_BITS)
882         #define SCTP_APP_TAB_MASK       (SCTP_APP_TAB_SIZE - 1)
883         /* Hash table for SCTP application incarnations  */
884         struct list_head        sctp_apps[SCTP_APP_TAB_SIZE];
885 #endif
886         /* ip_vs_conn */
887         atomic_t                conn_count;      /* connection counter */
888 
889         /* ip_vs_ctl */
890         struct ip_vs_stats              tot_stats;  /* Statistics & est. */
891 
892         int                     num_services;    /* no of virtual services */
893 
894         /* Trash for destinations */
895         struct list_head        dest_trash;
896         spinlock_t              dest_trash_lock;
897         struct timer_list       dest_trash_timer; /* expiration timer */
898         /* Service counters */
899         atomic_t                ftpsvc_counter;
900         atomic_t                nullsvc_counter;
901 
902 #ifdef CONFIG_SYSCTL
903         /* 1/rate drop and drop-entry variables */
904         struct delayed_work     defense_work;   /* Work handler */
905         int                     drop_rate;
906         int                     drop_counter;
907         atomic_t                dropentry;
908         /* locks in ctl.c */
909         spinlock_t              dropentry_lock;  /* drop entry handling */
910         spinlock_t              droppacket_lock; /* drop packet handling */
911         spinlock_t              securetcp_lock;  /* state and timeout tables */
912 
913         /* sys-ctl struct */
914         struct ctl_table_header *sysctl_hdr;
915         struct ctl_table        *sysctl_tbl;
916 #endif
917 
918         /* sysctl variables */
919         int                     sysctl_amemthresh;
920         int                     sysctl_am_droprate;
921         int                     sysctl_drop_entry;
922         int                     sysctl_drop_packet;
923         int                     sysctl_secure_tcp;
924 #ifdef CONFIG_IP_VS_NFCT
925         int                     sysctl_conntrack;
926 #endif
927         int                     sysctl_snat_reroute;
928         int                     sysctl_sync_ver;
929         int                     sysctl_sync_ports;
930         int                     sysctl_sync_persist_mode;
931         unsigned long           sysctl_sync_qlen_max;
932         int                     sysctl_sync_sock_size;
933         int                     sysctl_cache_bypass;
934         int                     sysctl_expire_nodest_conn;
935         int                     sysctl_sloppy_tcp;
936         int                     sysctl_sloppy_sctp;
937         int                     sysctl_expire_quiescent_template;
938         int                     sysctl_sync_threshold[2];
939         unsigned int            sysctl_sync_refresh_period;
940         int                     sysctl_sync_retries;
941         int                     sysctl_nat_icmp_send;
942         int                     sysctl_pmtu_disc;
943         int                     sysctl_backup_only;
944         int                     sysctl_conn_reuse_mode;
945 
946         /* ip_vs_lblc */
947         int                     sysctl_lblc_expiration;
948         struct ctl_table_header *lblc_ctl_header;
949         struct ctl_table        *lblc_ctl_table;
950         /* ip_vs_lblcr */
951         int                     sysctl_lblcr_expiration;
952         struct ctl_table_header *lblcr_ctl_header;
953         struct ctl_table        *lblcr_ctl_table;
954         /* ip_vs_est */
955         struct list_head        est_list;       /* estimator list */
956         spinlock_t              est_lock;
957         struct timer_list       est_timer;      /* Estimation timer */
958         /* ip_vs_sync */
959         spinlock_t              sync_lock;
960         struct ipvs_master_sync_state *ms;
961         spinlock_t              sync_buff_lock;
962         struct task_struct      **backup_threads;
963         int                     threads_mask;
964         int                     send_mesg_maxlen;
965         int                     recv_mesg_maxlen;
966         volatile int            sync_state;
967         volatile int            master_syncid;
968         volatile int            backup_syncid;
969         struct mutex            sync_mutex;
970         /* multicast interface name */
971         char                    master_mcast_ifn[IP_VS_IFNAME_MAXLEN];
972         char                    backup_mcast_ifn[IP_VS_IFNAME_MAXLEN];
973         /* net name space ptr */
974         struct net              *net;            /* Needed by timer routines */
975         /* Number of heterogeneous destinations, needed becaus heterogeneous
976          * are not supported when synchronization is enabled.
977          */
978         unsigned int            mixed_address_family_dests;
979 };
980 
981 #define DEFAULT_SYNC_THRESHOLD  3
982 #define DEFAULT_SYNC_PERIOD     50
983 #define DEFAULT_SYNC_VER        1
984 #define DEFAULT_SLOPPY_TCP      0
985 #define DEFAULT_SLOPPY_SCTP     0
986 #define DEFAULT_SYNC_REFRESH_PERIOD     (0U * HZ)
987 #define DEFAULT_SYNC_RETRIES            0
988 #define IPVS_SYNC_WAKEUP_RATE   8
989 #define IPVS_SYNC_QLEN_MAX      (IPVS_SYNC_WAKEUP_RATE * 4)
990 #define IPVS_SYNC_SEND_DELAY    (HZ / 50)
991 #define IPVS_SYNC_CHECK_PERIOD  HZ
992 #define IPVS_SYNC_FLUSH_TIME    (HZ * 2)
993 #define IPVS_SYNC_PORTS_MAX     (1 << 6)
994 
995 #ifdef CONFIG_SYSCTL
996 
997 static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
998 {
999         return ipvs->sysctl_sync_threshold[0];
1000 }
1001 
1002 static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
1003 {
1004         return ACCESS_ONCE(ipvs->sysctl_sync_threshold[1]);
1005 }
1006 
1007 static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
1008 {
1009         return ACCESS_ONCE(ipvs->sysctl_sync_refresh_period);
1010 }
1011 
1012 static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
1013 {
1014         return ipvs->sysctl_sync_retries;
1015 }
1016 
1017 static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
1018 {
1019         return ipvs->sysctl_sync_ver;
1020 }
1021 
1022 static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs)
1023 {
1024         return ipvs->sysctl_sloppy_tcp;
1025 }
1026 
1027 static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs)
1028 {
1029         return ipvs->sysctl_sloppy_sctp;
1030 }
1031 
1032 static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
1033 {
1034         return ACCESS_ONCE(ipvs->sysctl_sync_ports);
1035 }
1036 
1037 static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs)
1038 {
1039         return ipvs->sysctl_sync_persist_mode;
1040 }
1041 
1042 static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
1043 {
1044         return ipvs->sysctl_sync_qlen_max;
1045 }
1046 
1047 static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
1048 {
1049         return ipvs->sysctl_sync_sock_size;
1050 }
1051 
1052 static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
1053 {
1054         return ipvs->sysctl_pmtu_disc;
1055 }
1056 
1057 static inline int sysctl_backup_only(struct netns_ipvs *ipvs)
1058 {
1059         return ipvs->sync_state & IP_VS_STATE_BACKUP &&
1060                ipvs->sysctl_backup_only;
1061 }
1062 
1063 static inline int sysctl_conn_reuse_mode(struct netns_ipvs *ipvs)
1064 {
1065         return ipvs->sysctl_conn_reuse_mode;
1066 }
1067 
1068 #else
1069 
1070 static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
1071 {
1072         return DEFAULT_SYNC_THRESHOLD;
1073 }
1074 
1075 static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
1076 {
1077         return DEFAULT_SYNC_PERIOD;
1078 }
1079 
1080 static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
1081 {
1082         return DEFAULT_SYNC_REFRESH_PERIOD;
1083 }
1084 
1085 static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
1086 {
1087         return DEFAULT_SYNC_RETRIES & 3;
1088 }
1089 
1090 static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
1091 {
1092         return DEFAULT_SYNC_VER;
1093 }
1094 
1095 static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs)
1096 {
1097         return DEFAULT_SLOPPY_TCP;
1098 }
1099 
1100 static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs)
1101 {
1102         return DEFAULT_SLOPPY_SCTP;
1103 }
1104 
1105 static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
1106 {
1107         return 1;
1108 }
1109 
1110 static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs)
1111 {
1112         return 0;
1113 }
1114 
1115 static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
1116 {
1117         return IPVS_SYNC_QLEN_MAX;
1118 }
1119 
1120 static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
1121 {
1122         return 0;
1123 }
1124 
1125 static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
1126 {
1127         return 1;
1128 }
1129 
1130 static inline int sysctl_backup_only(struct netns_ipvs *ipvs)
1131 {
1132         return 0;
1133 }
1134 
1135 static inline int sysctl_conn_reuse_mode(struct netns_ipvs *ipvs)
1136 {
1137         return 1;
1138 }
1139 
1140 #endif
1141 
1142 /* IPVS core functions
1143  * (from ip_vs_core.c)
1144  */
1145 const char *ip_vs_proto_name(unsigned int proto);
1146 void ip_vs_init_hash_table(struct list_head *table, int rows);
1147 #define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table((t), ARRAY_SIZE((t)))
1148 
1149 #define IP_VS_APP_TYPE_FTP      1
1150 
1151 /* ip_vs_conn handling functions
1152  * (from ip_vs_conn.c)
1153  */
1154 enum {
1155         IP_VS_DIR_INPUT = 0,
1156         IP_VS_DIR_OUTPUT,
1157         IP_VS_DIR_INPUT_ONLY,
1158         IP_VS_DIR_LAST,
1159 };
1160 
1161 static inline void ip_vs_conn_fill_param(struct net *net, int af, int protocol,
1162                                          const union nf_inet_addr *caddr,
1163                                          __be16 cport,
1164                                          const union nf_inet_addr *vaddr,
1165                                          __be16 vport,
1166                                          struct ip_vs_conn_param *p)
1167 {
1168         p->net = net;
1169         p->af = af;
1170         p->protocol = protocol;
1171         p->caddr = caddr;
1172         p->cport = cport;
1173         p->vaddr = vaddr;
1174         p->vport = vport;
1175         p->pe = NULL;
1176         p->pe_data = NULL;
1177 }
1178 
1179 struct ip_vs_conn *ip_vs_conn_in_get(const struct ip_vs_conn_param *p);
1180 struct ip_vs_conn *ip_vs_ct_in_get(const struct ip_vs_conn_param *p);
1181 
1182 struct ip_vs_conn * ip_vs_conn_in_get_proto(int af, const struct sk_buff *skb,
1183                                             const struct ip_vs_iphdr *iph,
1184                                             int inverse);
1185 
1186 struct ip_vs_conn *ip_vs_conn_out_get(const struct ip_vs_conn_param *p);
1187 
1188 struct ip_vs_conn * ip_vs_conn_out_get_proto(int af, const struct sk_buff *skb,
1189                                              const struct ip_vs_iphdr *iph,
1190                                              int inverse);
1191 
1192 /* Get reference to gain full access to conn.
1193  * By default, RCU read-side critical sections have access only to
1194  * conn fields and its PE data, see ip_vs_conn_rcu_free() for reference.
1195  */
1196 static inline bool __ip_vs_conn_get(struct ip_vs_conn *cp)
1197 {
1198         return atomic_inc_not_zero(&cp->refcnt);
1199 }
1200 
1201 /* put back the conn without restarting its timer */
1202 static inline void __ip_vs_conn_put(struct ip_vs_conn *cp)
1203 {
1204         smp_mb__before_atomic();
1205         atomic_dec(&cp->refcnt);
1206 }
1207 void ip_vs_conn_put(struct ip_vs_conn *cp);
1208 void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport);
1209 
1210 struct ip_vs_conn *ip_vs_conn_new(const struct ip_vs_conn_param *p, int dest_af,
1211                                   const union nf_inet_addr *daddr,
1212                                   __be16 dport, unsigned int flags,
1213                                   struct ip_vs_dest *dest, __u32 fwmark);
1214 void ip_vs_conn_expire_now(struct ip_vs_conn *cp);
1215 
1216 const char *ip_vs_state_name(__u16 proto, int state);
1217 
1218 void ip_vs_tcp_conn_listen(struct net *net, struct ip_vs_conn *cp);
1219 int ip_vs_check_template(struct ip_vs_conn *ct);
1220 void ip_vs_random_dropentry(struct net *net);
1221 int ip_vs_conn_init(void);
1222 void ip_vs_conn_cleanup(void);
1223 
1224 static inline void ip_vs_control_del(struct ip_vs_conn *cp)
1225 {
1226         struct ip_vs_conn *ctl_cp = cp->control;
1227         if (!ctl_cp) {
1228                 IP_VS_ERR_BUF("request control DEL for uncontrolled: "
1229                               "%s:%d to %s:%d\n",
1230                               IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1231                               ntohs(cp->cport),
1232                               IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1233                               ntohs(cp->vport));
1234 
1235                 return;
1236         }
1237 
1238         IP_VS_DBG_BUF(7, "DELeting control for: "
1239                       "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1240                       IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1241                       ntohs(cp->cport),
1242                       IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1243                       ntohs(ctl_cp->cport));
1244 
1245         cp->control = NULL;
1246         if (atomic_read(&ctl_cp->n_control) == 0) {
1247                 IP_VS_ERR_BUF("BUG control DEL with n=0 : "
1248                               "%s:%d to %s:%d\n",
1249                               IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1250                               ntohs(cp->cport),
1251                               IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1252                               ntohs(cp->vport));
1253 
1254                 return;
1255         }
1256         atomic_dec(&ctl_cp->n_control);
1257 }
1258 
1259 static inline void
1260 ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp)
1261 {
1262         if (cp->control) {
1263                 IP_VS_ERR_BUF("request control ADD for already controlled: "
1264                               "%s:%d to %s:%d\n",
1265                               IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1266                               ntohs(cp->cport),
1267                               IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1268                               ntohs(cp->vport));
1269 
1270                 ip_vs_control_del(cp);
1271         }
1272 
1273         IP_VS_DBG_BUF(7, "ADDing control for: "
1274                       "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1275                       IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1276                       ntohs(cp->cport),
1277                       IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1278                       ntohs(ctl_cp->cport));
1279 
1280         cp->control = ctl_cp;
1281         atomic_inc(&ctl_cp->n_control);
1282 }
1283 
1284 /* IPVS netns init & cleanup functions */
1285 int ip_vs_estimator_net_init(struct net *net);
1286 int ip_vs_control_net_init(struct net *net);
1287 int ip_vs_protocol_net_init(struct net *net);
1288 int ip_vs_app_net_init(struct net *net);
1289 int ip_vs_conn_net_init(struct net *net);
1290 int ip_vs_sync_net_init(struct net *net);
1291 void ip_vs_conn_net_cleanup(struct net *net);
1292 void ip_vs_app_net_cleanup(struct net *net);
1293 void ip_vs_protocol_net_cleanup(struct net *net);
1294 void ip_vs_control_net_cleanup(struct net *net);
1295 void ip_vs_estimator_net_cleanup(struct net *net);
1296 void ip_vs_sync_net_cleanup(struct net *net);
1297 void ip_vs_service_net_cleanup(struct net *net);
1298 
1299 /* IPVS application functions
1300  * (from ip_vs_app.c)
1301  */
1302 #define IP_VS_APP_MAX_PORTS  8
1303 struct ip_vs_app *register_ip_vs_app(struct net *net, struct ip_vs_app *app);
1304 void unregister_ip_vs_app(struct net *net, struct ip_vs_app *app);
1305 int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1306 void ip_vs_unbind_app(struct ip_vs_conn *cp);
1307 int register_ip_vs_app_inc(struct net *net, struct ip_vs_app *app, __u16 proto,
1308                            __u16 port);
1309 int ip_vs_app_inc_get(struct ip_vs_app *inc);
1310 void ip_vs_app_inc_put(struct ip_vs_app *inc);
1311 
1312 int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb);
1313 int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb);
1314 
1315 int register_ip_vs_pe(struct ip_vs_pe *pe);
1316 int unregister_ip_vs_pe(struct ip_vs_pe *pe);
1317 struct ip_vs_pe *ip_vs_pe_getbyname(const char *name);
1318 struct ip_vs_pe *__ip_vs_pe_getbyname(const char *pe_name);
1319 
1320 /* Use a #define to avoid all of module.h just for these trivial ops */
1321 #define ip_vs_pe_get(pe)                        \
1322         if (pe && pe->module)                   \
1323                 __module_get(pe->module);
1324 
1325 #define ip_vs_pe_put(pe)                        \
1326         if (pe && pe->module)                   \
1327                 module_put(pe->module);
1328 
1329 /* IPVS protocol functions (from ip_vs_proto.c) */
1330 int ip_vs_protocol_init(void);
1331 void ip_vs_protocol_cleanup(void);
1332 void ip_vs_protocol_timeout_change(struct netns_ipvs *ipvs, int flags);
1333 int *ip_vs_create_timeout_table(int *table, int size);
1334 int ip_vs_set_state_timeout(int *table, int num, const char *const *names,
1335                             const char *name, int to);
1336 void ip_vs_tcpudp_debug_packet(int af, struct ip_vs_protocol *pp,
1337                                const struct sk_buff *skb, int offset,
1338                                const char *msg);
1339 
1340 extern struct ip_vs_protocol ip_vs_protocol_tcp;
1341 extern struct ip_vs_protocol ip_vs_protocol_udp;
1342 extern struct ip_vs_protocol ip_vs_protocol_icmp;
1343 extern struct ip_vs_protocol ip_vs_protocol_esp;
1344 extern struct ip_vs_protocol ip_vs_protocol_ah;
1345 extern struct ip_vs_protocol ip_vs_protocol_sctp;
1346 
1347 /* Registering/unregistering scheduler functions
1348  * (from ip_vs_sched.c)
1349  */
1350 int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1351 int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1352 int ip_vs_bind_scheduler(struct ip_vs_service *svc,
1353                          struct ip_vs_scheduler *scheduler);
1354 void ip_vs_unbind_scheduler(struct ip_vs_service *svc,
1355                             struct ip_vs_scheduler *sched);
1356 struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name);
1357 void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler);
1358 struct ip_vs_conn *
1359 ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb,
1360                struct ip_vs_proto_data *pd, int *ignored,
1361                struct ip_vs_iphdr *iph);
1362 int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
1363                 struct ip_vs_proto_data *pd, struct ip_vs_iphdr *iph);
1364 
1365 void ip_vs_scheduler_err(struct ip_vs_service *svc, const char *msg);
1366 
1367 /* IPVS control data and functions (from ip_vs_ctl.c) */
1368 extern struct ip_vs_stats ip_vs_stats;
1369 extern int sysctl_ip_vs_sync_ver;
1370 
1371 struct ip_vs_service *
1372 ip_vs_service_find(struct net *net, int af, __u32 fwmark, __u16 protocol,
1373                   const union nf_inet_addr *vaddr, __be16 vport);
1374 
1375 bool ip_vs_has_real_service(struct net *net, int af, __u16 protocol,
1376                             const union nf_inet_addr *daddr, __be16 dport);
1377 
1378 int ip_vs_use_count_inc(void);
1379 void ip_vs_use_count_dec(void);
1380 int ip_vs_register_nl_ioctl(void);
1381 void ip_vs_unregister_nl_ioctl(void);
1382 int ip_vs_control_init(void);
1383 void ip_vs_control_cleanup(void);
1384 struct ip_vs_dest *
1385 ip_vs_find_dest(struct net *net, int svc_af, int dest_af,
1386                 const union nf_inet_addr *daddr, __be16 dport,
1387                 const union nf_inet_addr *vaddr, __be16 vport,
1388                 __u16 protocol, __u32 fwmark, __u32 flags);
1389 void ip_vs_try_bind_dest(struct ip_vs_conn *cp);
1390 
1391 static inline void ip_vs_dest_hold(struct ip_vs_dest *dest)
1392 {
1393         atomic_inc(&dest->refcnt);
1394 }
1395 
1396 static inline void ip_vs_dest_put(struct ip_vs_dest *dest)
1397 {
1398         smp_mb__before_atomic();
1399         atomic_dec(&dest->refcnt);
1400 }
1401 
1402 static inline void ip_vs_dest_put_and_free(struct ip_vs_dest *dest)
1403 {
1404         if (atomic_dec_return(&dest->refcnt) < 0)
1405                 kfree(dest);
1406 }
1407 
1408 /* IPVS sync daemon data and function prototypes
1409  * (from ip_vs_sync.c)
1410  */
1411 int start_sync_thread(struct net *net, int state, char *mcast_ifn, __u8 syncid);
1412 int stop_sync_thread(struct net *net, int state);
1413 void ip_vs_sync_conn(struct net *net, struct ip_vs_conn *cp, int pkts);
1414 
1415 /* IPVS rate estimator prototypes (from ip_vs_est.c) */
1416 void ip_vs_start_estimator(struct net *net, struct ip_vs_stats *stats);
1417 void ip_vs_stop_estimator(struct net *net, struct ip_vs_stats *stats);
1418 void ip_vs_zero_estimator(struct ip_vs_stats *stats);
1419 void ip_vs_read_estimator(struct ip_vs_kstats *dst, struct ip_vs_stats *stats);
1420 
1421 /* Various IPVS packet transmitters (from ip_vs_xmit.c) */
1422 int ip_vs_null_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1423                     struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1424 int ip_vs_bypass_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1425                       struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1426 int ip_vs_nat_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1427                    struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1428 int ip_vs_tunnel_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1429                       struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1430 int ip_vs_dr_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1431                   struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1432 int ip_vs_icmp_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1433                     struct ip_vs_protocol *pp, int offset,
1434                     unsigned int hooknum, struct ip_vs_iphdr *iph);
1435 void ip_vs_dest_dst_rcu_free(struct rcu_head *head);
1436 
1437 #ifdef CONFIG_IP_VS_IPV6
1438 int ip_vs_bypass_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1439                          struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1440 int ip_vs_nat_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1441                       struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1442 int ip_vs_tunnel_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1443                          struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1444 int ip_vs_dr_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1445                      struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1446 int ip_vs_icmp_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1447                        struct ip_vs_protocol *pp, int offset,
1448                        unsigned int hooknum, struct ip_vs_iphdr *iph);
1449 #endif
1450 
1451 #ifdef CONFIG_SYSCTL
1452 /* This is a simple mechanism to ignore packets when
1453  * we are loaded. Just set ip_vs_drop_rate to 'n' and
1454  * we start to drop 1/rate of the packets
1455  */
1456 static inline int ip_vs_todrop(struct netns_ipvs *ipvs)
1457 {
1458         if (!ipvs->drop_rate)
1459                 return 0;
1460         if (--ipvs->drop_counter > 0)
1461                 return 0;
1462         ipvs->drop_counter = ipvs->drop_rate;
1463         return 1;
1464 }
1465 #else
1466 static inline int ip_vs_todrop(struct netns_ipvs *ipvs) { return 0; }
1467 #endif
1468 
1469 /* ip_vs_fwd_tag returns the forwarding tag of the connection */
1470 #define IP_VS_FWD_METHOD(cp)  (cp->flags & IP_VS_CONN_F_FWD_MASK)
1471 
1472 static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp)
1473 {
1474         char fwd;
1475 
1476         switch (IP_VS_FWD_METHOD(cp)) {
1477         case IP_VS_CONN_F_MASQ:
1478                 fwd = 'M'; break;
1479         case IP_VS_CONN_F_LOCALNODE:
1480                 fwd = 'L'; break;
1481         case IP_VS_CONN_F_TUNNEL:
1482                 fwd = 'T'; break;
1483         case IP_VS_CONN_F_DROUTE:
1484                 fwd = 'R'; break;
1485         case IP_VS_CONN_F_BYPASS:
1486                 fwd = 'B'; break;
1487         default:
1488                 fwd = '?'; break;
1489         }
1490         return fwd;
1491 }
1492 
1493 void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp,
1494                     struct ip_vs_conn *cp, int dir);
1495 
1496 #ifdef CONFIG_IP_VS_IPV6
1497 void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp,
1498                        struct ip_vs_conn *cp, int dir);
1499 #endif
1500 
1501 __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset);
1502 
1503 static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum)
1504 {
1505         __be32 diff[2] = { ~old, new };
1506 
1507         return csum_partial(diff, sizeof(diff), oldsum);
1508 }
1509 
1510 #ifdef CONFIG_IP_VS_IPV6
1511 static inline __wsum ip_vs_check_diff16(const __be32 *old, const __be32 *new,
1512                                         __wsum oldsum)
1513 {
1514         __be32 diff[8] = { ~old[3], ~old[2], ~old[1], ~old[0],
1515                             new[3],  new[2],  new[1],  new[0] };
1516 
1517         return csum_partial(diff, sizeof(diff), oldsum);
1518 }
1519 #endif
1520 
1521 static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum)
1522 {
1523         __be16 diff[2] = { ~old, new };
1524 
1525         return csum_partial(diff, sizeof(diff), oldsum);
1526 }
1527 
1528 /* Forget current conntrack (unconfirmed) and attach notrack entry */
1529 static inline void ip_vs_notrack(struct sk_buff *skb)
1530 {
1531 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
1532         enum ip_conntrack_info ctinfo;
1533         struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
1534 
1535         if (!ct || !nf_ct_is_untracked(ct)) {
1536                 nf_conntrack_put(skb->nfct);
1537                 skb->nfct = &nf_ct_untracked_get()->ct_general;
1538                 skb->nfctinfo = IP_CT_NEW;
1539                 nf_conntrack_get(skb->nfct);
1540         }
1541 #endif
1542 }
1543 
1544 #ifdef CONFIG_IP_VS_NFCT
1545 /* Netfilter connection tracking
1546  * (from ip_vs_nfct.c)
1547  */
1548 static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1549 {
1550 #ifdef CONFIG_SYSCTL
1551         return ipvs->sysctl_conntrack;
1552 #else
1553         return 0;
1554 #endif
1555 }
1556 
1557 void ip_vs_update_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp,
1558                             int outin);
1559 int ip_vs_confirm_conntrack(struct sk_buff *skb);
1560 void ip_vs_nfct_expect_related(struct sk_buff *skb, struct nf_conn *ct,
1561                                struct ip_vs_conn *cp, u_int8_t proto,
1562                                const __be16 port, int from_rs);
1563 void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp);
1564 
1565 #else
1566 
1567 static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1568 {
1569         return 0;
1570 }
1571 
1572 static inline void ip_vs_update_conntrack(struct sk_buff *skb,
1573                                           struct ip_vs_conn *cp, int outin)
1574 {
1575 }
1576 
1577 static inline int ip_vs_confirm_conntrack(struct sk_buff *skb)
1578 {
1579         return NF_ACCEPT;
1580 }
1581 
1582 static inline void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp)
1583 {
1584 }
1585 #endif /* CONFIG_IP_VS_NFCT */
1586 
1587 /* Really using conntrack? */
1588 static inline bool ip_vs_conn_uses_conntrack(struct ip_vs_conn *cp,
1589                                              struct sk_buff *skb)
1590 {
1591 #ifdef CONFIG_IP_VS_NFCT
1592         enum ip_conntrack_info ctinfo;
1593         struct nf_conn *ct;
1594 
1595         if (!(cp->flags & IP_VS_CONN_F_NFCT))
1596                 return false;
1597         ct = nf_ct_get(skb, &ctinfo);
1598         if (ct && !nf_ct_is_untracked(ct))
1599                 return true;
1600 #endif
1601         return false;
1602 }
1603 
1604 static inline int
1605 ip_vs_dest_conn_overhead(struct ip_vs_dest *dest)
1606 {
1607         /* We think the overhead of processing active connections is 256
1608          * times higher than that of inactive connections in average. (This
1609          * 256 times might not be accurate, we will change it later) We
1610          * use the following formula to estimate the overhead now:
1611          *                dest->activeconns*256 + dest->inactconns
1612          */
1613         return (atomic_read(&dest->activeconns) << 8) +
1614                 atomic_read(&dest->inactconns);
1615 }
1616 
1617 #endif  /* _NET_IP_VS_H */
1618 

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