1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* IP Virtual Server
3 * data structure and functionality definitions
4 */
5
6 #ifndef _NET_IP_VS_H
7 #define _NET_IP_VS_H
8
9 #include <linux/ip_vs.h> /* definitions shared with userland */
10
11 #include <asm/types.h> /* for __uXX types */
12
13 #include <linux/list.h> /* for struct list_head */
14 #include <linux/rculist_bl.h> /* for struct hlist_bl_head */
15 #include <linux/spinlock.h> /* for struct rwlock_t */
16 #include <linux/atomic.h> /* for struct atomic_t */
17 #include <linux/refcount.h> /* for struct refcount_t */
18 #include <linux/workqueue.h>
19
20 #include <linux/compiler.h>
21 #include <linux/timer.h>
22 #include <linux/bug.h>
23
24 #include <net/checksum.h>
25 #include <linux/netfilter.h> /* for union nf_inet_addr */
26 #include <linux/ip.h>
27 #include <linux/ipv6.h> /* for struct ipv6hdr */
28 #include <net/ipv6.h>
29 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
30 #include <net/netfilter/nf_conntrack.h>
31 #endif
32 #include <net/net_namespace.h> /* Netw namespace */
33 #include <linux/sched/isolation.h>
34 #include <linux/siphash.h>
35
36 #define IP_VS_HDR_INVERSE 1
37 #define IP_VS_HDR_ICMP 2
38
39 /* conn_tab limits (as per Kconfig) */
40 #define IP_VS_CONN_TAB_MIN_BITS 8
41 #if BITS_PER_LONG > 32
42 #define IP_VS_CONN_TAB_MAX_BITS 27
43 #else
44 #define IP_VS_CONN_TAB_MAX_BITS 20
45 #endif
46
47 /* svc_table limits */
48 #define IP_VS_SVC_TAB_MIN_BITS 4
49 #define IP_VS_SVC_TAB_MAX_BITS 20
50
51 /* Generic access of ipvs struct */
net_ipvs(struct net * net)52 static inline struct netns_ipvs *net_ipvs(struct net* net)
53 {
54 return net->ipvs;
55 }
56
57 /* Connections' size value needed by ip_vs_ctl.c */
58 extern int ip_vs_conn_tab_size;
59
60 struct ip_vs_iphdr {
61 int hdr_flags; /* ipvs flags */
62 __u32 off; /* Where IP or IPv4 header starts */
63 __u32 len; /* IPv4 simply where L4 starts
64 * IPv6 where L4 Transport Header starts */
65 __u16 fragoffs; /* IPv6 fragment offset, 0 if first frag (or not frag)*/
66 __s16 protocol;
67 __s32 flags;
68 union nf_inet_addr saddr;
69 union nf_inet_addr daddr;
70 };
71
frag_safe_skb_hp(const struct sk_buff * skb,int offset,int len,void * buffer)72 static inline void *frag_safe_skb_hp(const struct sk_buff *skb, int offset,
73 int len, void *buffer)
74 {
75 return skb_header_pointer(skb, offset, len, buffer);
76 }
77
78 /* This function handles filling *ip_vs_iphdr, both for IPv4 and IPv6.
79 * IPv6 requires some extra work, as finding proper header position,
80 * depend on the IPv6 extension headers.
81 */
82 static inline int
ip_vs_fill_iph_skb_off(int af,const struct sk_buff * skb,int offset,int hdr_flags,struct ip_vs_iphdr * iphdr)83 ip_vs_fill_iph_skb_off(int af, const struct sk_buff *skb, int offset,
84 int hdr_flags, struct ip_vs_iphdr *iphdr)
85 {
86 iphdr->hdr_flags = hdr_flags;
87 iphdr->off = offset;
88
89 #ifdef CONFIG_IP_VS_IPV6
90 if (af == AF_INET6) {
91 struct ipv6hdr _iph;
92 const struct ipv6hdr *iph = skb_header_pointer(
93 skb, offset, sizeof(_iph), &_iph);
94 if (!iph)
95 return 0;
96
97 iphdr->saddr.in6 = iph->saddr;
98 iphdr->daddr.in6 = iph->daddr;
99 /* ipv6_find_hdr() updates len, flags */
100 iphdr->len = offset;
101 iphdr->flags = 0;
102 iphdr->protocol = ipv6_find_hdr(skb, &iphdr->len, -1,
103 &iphdr->fragoffs,
104 &iphdr->flags);
105 if (iphdr->protocol < 0)
106 return 0;
107 } else
108 #endif
109 {
110 struct iphdr _iph;
111 const struct iphdr *iph = skb_header_pointer(
112 skb, offset, sizeof(_iph), &_iph);
113 if (!iph)
114 return 0;
115
116 iphdr->len = offset + iph->ihl * 4;
117 iphdr->fragoffs = 0;
118 iphdr->protocol = iph->protocol;
119 iphdr->saddr.ip = iph->saddr;
120 iphdr->daddr.ip = iph->daddr;
121 }
122
123 return 1;
124 }
125
126 static inline int
ip_vs_fill_iph_skb_icmp(int af,const struct sk_buff * skb,int offset,bool inverse,struct ip_vs_iphdr * iphdr)127 ip_vs_fill_iph_skb_icmp(int af, const struct sk_buff *skb, int offset,
128 bool inverse, struct ip_vs_iphdr *iphdr)
129 {
130 int hdr_flags = IP_VS_HDR_ICMP;
131
132 if (inverse)
133 hdr_flags |= IP_VS_HDR_INVERSE;
134
135 return ip_vs_fill_iph_skb_off(af, skb, offset, hdr_flags, iphdr);
136 }
137
138 static inline int
ip_vs_fill_iph_skb(int af,const struct sk_buff * skb,bool inverse,struct ip_vs_iphdr * iphdr)139 ip_vs_fill_iph_skb(int af, const struct sk_buff *skb, bool inverse,
140 struct ip_vs_iphdr *iphdr)
141 {
142 int hdr_flags = 0;
143
144 if (inverse)
145 hdr_flags |= IP_VS_HDR_INVERSE;
146
147 return ip_vs_fill_iph_skb_off(af, skb, skb_network_offset(skb),
148 hdr_flags, iphdr);
149 }
150
151 static inline bool
ip_vs_iph_inverse(const struct ip_vs_iphdr * iph)152 ip_vs_iph_inverse(const struct ip_vs_iphdr *iph)
153 {
154 return !!(iph->hdr_flags & IP_VS_HDR_INVERSE);
155 }
156
157 static inline bool
ip_vs_iph_icmp(const struct ip_vs_iphdr * iph)158 ip_vs_iph_icmp(const struct ip_vs_iphdr *iph)
159 {
160 return !!(iph->hdr_flags & IP_VS_HDR_ICMP);
161 }
162
ip_vs_addr_copy(int af,union nf_inet_addr * dst,const union nf_inet_addr * src)163 static inline void ip_vs_addr_copy(int af, union nf_inet_addr *dst,
164 const union nf_inet_addr *src)
165 {
166 #ifdef CONFIG_IP_VS_IPV6
167 if (af == AF_INET6)
168 dst->in6 = src->in6;
169 else
170 #endif
171 dst->ip = src->ip;
172 }
173
ip_vs_addr_set(int af,union nf_inet_addr * dst,const union nf_inet_addr * src)174 static inline void ip_vs_addr_set(int af, union nf_inet_addr *dst,
175 const union nf_inet_addr *src)
176 {
177 #ifdef CONFIG_IP_VS_IPV6
178 if (af == AF_INET6) {
179 dst->in6 = src->in6;
180 return;
181 }
182 #endif
183 dst->ip = src->ip;
184 dst->all[1] = 0;
185 dst->all[2] = 0;
186 dst->all[3] = 0;
187 }
188
ip_vs_addr_equal(int af,const union nf_inet_addr * a,const union nf_inet_addr * b)189 static inline int ip_vs_addr_equal(int af, const union nf_inet_addr *a,
190 const union nf_inet_addr *b)
191 {
192 #ifdef CONFIG_IP_VS_IPV6
193 if (af == AF_INET6)
194 return ipv6_addr_equal(&a->in6, &b->in6);
195 #endif
196 return a->ip == b->ip;
197 }
198
199 #ifdef CONFIG_IP_VS_DEBUG
200 #include <linux/net.h>
201
202 int ip_vs_get_debug_level(void);
203
ip_vs_dbg_addr(int af,char * buf,size_t buf_len,const union nf_inet_addr * addr,int * idx)204 static inline const char *ip_vs_dbg_addr(int af, char *buf, size_t buf_len,
205 const union nf_inet_addr *addr,
206 int *idx)
207 {
208 int len;
209 #ifdef CONFIG_IP_VS_IPV6
210 if (af == AF_INET6)
211 len = snprintf(&buf[*idx], buf_len - *idx, "[%pI6c]",
212 &addr->in6) + 1;
213 else
214 #endif
215 len = snprintf(&buf[*idx], buf_len - *idx, "%pI4",
216 &addr->ip) + 1;
217
218 *idx += len;
219 BUG_ON(*idx > buf_len + 1);
220 return &buf[*idx - len];
221 }
222
223 #define IP_VS_DBG_BUF(level, msg, ...) \
224 do { \
225 char ip_vs_dbg_buf[160]; \
226 int ip_vs_dbg_idx = 0; \
227 if (level <= ip_vs_get_debug_level()) \
228 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
229 } while (0)
230 #define IP_VS_ERR_BUF(msg...) \
231 do { \
232 char ip_vs_dbg_buf[160]; \
233 int ip_vs_dbg_idx = 0; \
234 pr_err(msg); \
235 } while (0)
236
237 /* Only use from within IP_VS_DBG_BUF() or IP_VS_ERR_BUF macros */
238 #define IP_VS_DBG_ADDR(af, addr) \
239 ip_vs_dbg_addr(af, ip_vs_dbg_buf, \
240 sizeof(ip_vs_dbg_buf), addr, \
241 &ip_vs_dbg_idx)
242
243 #define IP_VS_DBG(level, msg, ...) \
244 do { \
245 if (level <= ip_vs_get_debug_level()) \
246 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
247 } while (0)
248 #define IP_VS_DBG_RL(msg, ...) \
249 do { \
250 if (net_ratelimit()) \
251 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \
252 } while (0)
253 #define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg) \
254 do { \
255 if (level <= ip_vs_get_debug_level()) \
256 pp->debug_packet(af, pp, skb, ofs, msg); \
257 } while (0)
258 #define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) \
259 do { \
260 if (level <= ip_vs_get_debug_level() && \
261 net_ratelimit()) \
262 pp->debug_packet(af, pp, skb, ofs, msg); \
263 } while (0)
264 #else /* NO DEBUGGING at ALL */
265 #define IP_VS_DBG_BUF(level, msg...) do {} while (0)
266 #define IP_VS_ERR_BUF(msg...) do {} while (0)
267 #define IP_VS_DBG(level, msg...) do {} while (0)
268 #define IP_VS_DBG_RL(msg...) do {} while (0)
269 #define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg) do {} while (0)
270 #define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) do {} while (0)
271 #endif
272
273 #define IP_VS_BUG() BUG()
274 #define IP_VS_ERR_RL(msg, ...) \
275 do { \
276 if (net_ratelimit()) \
277 pr_err(msg, ##__VA_ARGS__); \
278 } while (0)
279
280 struct ip_vs_aligned_lock {
281 spinlock_t l; /* Protect buckets */
282 } ____cacheline_aligned_in_smp;
283
284 /* For arrays per family */
285 enum {
286 IP_VS_AF_INET,
287 IP_VS_AF_INET6,
288 IP_VS_AF_MAX
289 };
290
ip_vs_af_index(int af)291 static inline int ip_vs_af_index(int af)
292 {
293 return af == AF_INET6 ? IP_VS_AF_INET6 : IP_VS_AF_INET;
294 }
295
296 /* work_flags */
297 enum {
298 IP_VS_WORK_SVC_RESIZE, /* Schedule svc_resize_work */
299 IP_VS_WORK_SVC_NORESIZE, /* Stopping svc_resize_work */
300 IP_VS_WORK_CONN_RESIZE, /* Schedule conn_resize_work */
301 };
302
303 /* The port number of FTP service (in network order). */
304 #define FTPPORT cpu_to_be16(21)
305 #define FTPDATA cpu_to_be16(20)
306
307 /* TCP State Values */
308 enum {
309 IP_VS_TCP_S_NONE = 0,
310 IP_VS_TCP_S_ESTABLISHED,
311 IP_VS_TCP_S_SYN_SENT,
312 IP_VS_TCP_S_SYN_RECV,
313 IP_VS_TCP_S_FIN_WAIT,
314 IP_VS_TCP_S_TIME_WAIT,
315 IP_VS_TCP_S_CLOSE,
316 IP_VS_TCP_S_CLOSE_WAIT,
317 IP_VS_TCP_S_LAST_ACK,
318 IP_VS_TCP_S_LISTEN,
319 IP_VS_TCP_S_SYNACK,
320 IP_VS_TCP_S_LAST
321 };
322
323 /* UDP State Values */
324 enum {
325 IP_VS_UDP_S_NORMAL,
326 IP_VS_UDP_S_LAST,
327 };
328
329 /* ICMP State Values */
330 enum {
331 IP_VS_ICMP_S_NORMAL,
332 IP_VS_ICMP_S_LAST,
333 };
334
335 /* SCTP State Values */
336 enum ip_vs_sctp_states {
337 IP_VS_SCTP_S_NONE,
338 IP_VS_SCTP_S_INIT1,
339 IP_VS_SCTP_S_INIT,
340 IP_VS_SCTP_S_COOKIE_SENT,
341 IP_VS_SCTP_S_COOKIE_REPLIED,
342 IP_VS_SCTP_S_COOKIE_WAIT,
343 IP_VS_SCTP_S_COOKIE,
344 IP_VS_SCTP_S_COOKIE_ECHOED,
345 IP_VS_SCTP_S_ESTABLISHED,
346 IP_VS_SCTP_S_SHUTDOWN_SENT,
347 IP_VS_SCTP_S_SHUTDOWN_RECEIVED,
348 IP_VS_SCTP_S_SHUTDOWN_ACK_SENT,
349 IP_VS_SCTP_S_REJECTED,
350 IP_VS_SCTP_S_CLOSED,
351 IP_VS_SCTP_S_LAST
352 };
353
354 /* Connection templates use bits from state */
355 #define IP_VS_CTPL_S_NONE 0x0000
356 #define IP_VS_CTPL_S_ASSURED 0x0001
357 #define IP_VS_CTPL_S_LAST 0x0002
358
359 /* Delta sequence info structure
360 * Each ip_vs_conn has 2 (output AND input seq. changes).
361 * Only used in the VS/NAT.
362 */
363 struct ip_vs_seq {
364 __u32 init_seq; /* Add delta from this seq */
365 __u32 delta; /* Delta in sequence numbers */
366 __u32 previous_delta; /* Delta in sequence numbers
367 * before last resized pkt */
368 };
369
370 /* counters per cpu */
371 struct ip_vs_counters {
372 u64_stats_t conns; /* connections scheduled */
373 u64_stats_t inpkts; /* incoming packets */
374 u64_stats_t outpkts; /* outgoing packets */
375 u64_stats_t inbytes; /* incoming bytes */
376 u64_stats_t outbytes; /* outgoing bytes */
377 };
378 /* Stats per cpu */
379 struct ip_vs_cpu_stats {
380 struct ip_vs_counters cnt;
381 struct u64_stats_sync syncp;
382 };
383
384 /* Default nice for estimator kthreads */
385 #define IPVS_EST_NICE 0
386
387 /* IPVS statistics objects */
388 struct ip_vs_estimator {
389 struct hlist_node list;
390
391 u64 last_inbytes;
392 u64 last_outbytes;
393 u64 last_conns;
394 u64 last_inpkts;
395 u64 last_outpkts;
396
397 u64 cps;
398 u64 inpps;
399 u64 outpps;
400 u64 inbps;
401 u64 outbps;
402
403 s32 ktid:16, /* kthread ID, -1=temp list */
404 ktrow:8, /* row/tick ID for kthread */
405 ktcid:8; /* chain ID for kthread tick */
406 };
407
408 /*
409 * IPVS statistics object, 64-bit kernel version of struct ip_vs_stats_user
410 */
411 struct ip_vs_kstats {
412 u64 conns; /* connections scheduled */
413 u64 inpkts; /* incoming packets */
414 u64 outpkts; /* outgoing packets */
415 u64 inbytes; /* incoming bytes */
416 u64 outbytes; /* outgoing bytes */
417
418 u64 cps; /* current connection rate */
419 u64 inpps; /* current in packet rate */
420 u64 outpps; /* current out packet rate */
421 u64 inbps; /* current in byte rate */
422 u64 outbps; /* current out byte rate */
423 };
424
425 struct ip_vs_stats {
426 struct ip_vs_kstats kstats; /* kernel statistics */
427 struct ip_vs_estimator est; /* estimator */
428 struct ip_vs_cpu_stats __percpu *cpustats; /* per cpu counters */
429 spinlock_t lock; /* spin lock */
430 struct ip_vs_kstats kstats0; /* reset values */
431 };
432
433 struct ip_vs_stats_rcu {
434 struct ip_vs_stats s;
435 struct rcu_head rcu_head;
436 };
437
438 int ip_vs_stats_init_alloc(struct ip_vs_stats *s);
439 struct ip_vs_stats *ip_vs_stats_alloc(void);
440 void ip_vs_stats_release(struct ip_vs_stats *stats);
441 void ip_vs_stats_free(struct ip_vs_stats *stats);
442
443 /* Process estimators in multiple timer ticks (20/50/100, see ktrow) */
444 #define IPVS_EST_NTICKS 50
445 /* Estimation uses a 2-second period containing ticks (in jiffies) */
446 #define IPVS_EST_TICK ((2 * HZ) / IPVS_EST_NTICKS)
447
448 /* Limit of CPU load per kthread (8 for 12.5%), ratio of CPU capacity (1/C).
449 * Value of 4 and above ensures kthreads will take work without exceeding
450 * the CPU capacity under different circumstances.
451 */
452 #define IPVS_EST_LOAD_DIVISOR 8
453
454 /* Kthreads should not have work that exceeds the CPU load above 50% */
455 #define IPVS_EST_CPU_KTHREADS (IPVS_EST_LOAD_DIVISOR / 2)
456
457 /* Desired number of chains per timer tick (chain load factor in 100us units),
458 * 48=4.8ms of 40ms tick (12% CPU usage):
459 * 2 sec * 1000 ms in sec * 10 (100us in ms) / 8 (12.5%) / 50
460 */
461 #define IPVS_EST_CHAIN_FACTOR \
462 ALIGN_DOWN(2 * 1000 * 10 / IPVS_EST_LOAD_DIVISOR / IPVS_EST_NTICKS, 8)
463
464 /* Compiled number of chains per tick
465 * The defines should match cond_resched_rcu
466 */
467 #if defined(CONFIG_DEBUG_ATOMIC_SLEEP) || !defined(CONFIG_PREEMPT_RCU)
468 #define IPVS_EST_TICK_CHAINS IPVS_EST_CHAIN_FACTOR
469 #else
470 #define IPVS_EST_TICK_CHAINS 1
471 #endif
472
473 #if IPVS_EST_NTICKS > 127
474 #error Too many timer ticks for ktrow
475 #endif
476
477 /* Multiple chains processed in same tick */
478 struct ip_vs_est_tick_data {
479 struct rcu_head rcu_head;
480 struct hlist_head chains[IPVS_EST_TICK_CHAINS];
481 DECLARE_BITMAP(present, IPVS_EST_TICK_CHAINS);
482 DECLARE_BITMAP(full, IPVS_EST_TICK_CHAINS);
483 int chain_len[IPVS_EST_TICK_CHAINS];
484 };
485
486 /* Context for estimation kthread */
487 struct ip_vs_est_kt_data {
488 struct netns_ipvs *ipvs;
489 struct task_struct *task; /* task if running */
490 struct ip_vs_est_tick_data __rcu *ticks[IPVS_EST_NTICKS];
491 DECLARE_BITMAP(avail, IPVS_EST_NTICKS); /* tick has space for ests */
492 unsigned long est_timer; /* estimation timer (jiffies) */
493 struct ip_vs_stats *calc_stats; /* Used for calculation */
494 int needed; /* task is needed */
495 int tick_len[IPVS_EST_NTICKS]; /* est count */
496 int id; /* ktid per netns */
497 int chain_max; /* max ests per tick chain */
498 int tick_max; /* max ests per tick */
499 int est_count; /* attached ests to kthread */
500 int est_max_count; /* max ests per kthread */
501 int add_row; /* row for new ests */
502 int est_row; /* estimated row */
503 };
504
505 /* IPVS resizable hash tables */
506 struct ip_vs_rht {
507 struct hlist_bl_head *buckets;
508 struct ip_vs_rht __rcu *new_tbl; /* New/Same table */
509 seqcount_t *seqc; /* Protects moves */
510 struct ip_vs_aligned_lock *lock; /* Protect seqc */
511 int mask; /* Buckets mask */
512 int size; /* Buckets */
513 int seqc_mask; /* seqc mask */
514 int lock_mask; /* lock mask */
515 u32 table_id;
516 int u_thresh; /* upper threshold */
517 int l_thresh; /* lower threshold */
518 int lfactor; /* Load Factor (shift)*/
519 int bits; /* size = 1 << bits */
520 siphash_key_t hash_key;
521 struct rcu_head rcu_head;
522 };
523
524 /**
525 * ip_vs_rht_for_each_table() - Walk the hash tables
526 * @table: struct ip_vs_rht __rcu *table
527 * @t: current table, used as cursor, struct ip_vs_rht *var
528 * @p: previous table, temp struct ip_vs_rht *var
529 *
530 * Walk tables assuming others can not change the installed tables
531 */
532 #define ip_vs_rht_for_each_table(table, t, p) \
533 for (p = NULL, t = rcu_dereference_protected(table, 1); \
534 t != p; \
535 p = t, t = rcu_dereference_protected(t->new_tbl, 1))
536
537 /**
538 * ip_vs_rht_for_each_table_rcu() - Walk the hash tables under RCU reader lock
539 * @table: struct ip_vs_rht __rcu *table
540 * @t: current table, used as cursor, struct ip_vs_rht *var
541 * @p: previous table, temp struct ip_vs_rht *var
542 *
543 * We usually search in one table and also in second table on resizing
544 */
545 #define ip_vs_rht_for_each_table_rcu(table, t, p) \
546 for (p = NULL, t = rcu_dereference(table); \
547 t != p; \
548 p = t, t = rcu_dereference(t->new_tbl))
549
550 /**
551 * ip_vs_rht_for_each_bucket() - Walk all table buckets
552 * @t: current table, used as cursor, struct ip_vs_rht *var
553 * @bucket: bucket index, used as cursor, u32 var
554 * @head: bucket address, used as cursor, struct hlist_bl_head *var
555 */
556 #define ip_vs_rht_for_each_bucket(t, bucket, head) \
557 for (bucket = 0, head = (t)->buckets; \
558 bucket < t->size; bucket++, head++)
559
560 /**
561 * ip_vs_rht_for_bucket_retry() - Retry bucket if entries are moved
562 * @t: current table, used as cursor, struct ip_vs_rht *var
563 * @bucket: index of current bucket or hash key
564 * @sc: temp seqcount_t *var
565 * @seq: temp unsigned int var for sequence count
566 * @retry: temp int var
567 */
568 #define ip_vs_rht_for_bucket_retry(t, bucket, sc, seq, retry) \
569 for (retry = 1, sc = &(t)->seqc[(bucket) & (t)->seqc_mask]; \
570 retry && ({ seq = read_seqcount_begin(sc); 1; }); \
571 retry = read_seqcount_retry(sc, seq))
572
573 /**
574 * DECLARE_IP_VS_RHT_WALK_BUCKETS_RCU() - Declare variables
575 *
576 * Variables for ip_vs_rht_walk_buckets_rcu
577 */
578 #define DECLARE_IP_VS_RHT_WALK_BUCKETS_RCU() \
579 struct ip_vs_rht *_t, *_p; \
580 unsigned int _seq; \
581 seqcount_t *_sc; \
582 u32 _bucket; \
583 int _retry
584 /**
585 * ip_vs_rht_walk_buckets_rcu() - Walk all buckets under RCU read lock
586 * @table: struct ip_vs_rht __rcu *table
587 * @head: bucket address, used as cursor, struct hlist_bl_head *var
588 *
589 * Can be used while others add/delete/move entries
590 * Not suitable if duplicates are not desired
591 * Possible cases for reader that uses cond_resched_rcu() in the loop:
592 * - new table can not be installed, no need to repeat
593 * - new table can be installed => check and repeat if new table is
594 * installed, needed for !PREEMPT_RCU
595 */
596 #define ip_vs_rht_walk_buckets_rcu(table, head) \
597 ip_vs_rht_for_each_table_rcu(table, _t, _p) \
598 ip_vs_rht_for_each_bucket(_t, _bucket, head) \
599 ip_vs_rht_for_bucket_retry(_t, _bucket, _sc, \
600 _seq, _retry)
601
602 /**
603 * DECLARE_IP_VS_RHT_WALK_BUCKET_RCU() - Declare variables
604 *
605 * Variables for ip_vs_rht_walk_bucket_rcu
606 */
607 #define DECLARE_IP_VS_RHT_WALK_BUCKET_RCU() \
608 unsigned int _seq; \
609 seqcount_t *_sc; \
610 int _retry
611 /**
612 * ip_vs_rht_walk_bucket_rcu() - Walk bucket under RCU read lock
613 * @t: current table, struct ip_vs_rht *var
614 * @bucket: index of current bucket or hash key
615 * @head: bucket address, used as cursor, struct hlist_bl_head *var
616 *
617 * Can be used while others add/delete/move entries
618 * Not suitable if duplicates are not desired
619 * Possible cases for reader that uses cond_resched_rcu() in the loop:
620 * - new table can not be installed, no need to repeat
621 * - new table can be installed => check and repeat if new table is
622 * installed, needed for !PREEMPT_RCU
623 */
624 #define ip_vs_rht_walk_bucket_rcu(t, bucket, head) \
625 if (({ head = (t)->buckets + ((bucket) & (t)->mask); 0; })) \
626 {} \
627 else \
628 ip_vs_rht_for_bucket_retry(t, (bucket), _sc, _seq, _retry)
629
630 /**
631 * DECLARE_IP_VS_RHT_WALK_BUCKETS_SAFE_RCU() - Declare variables
632 *
633 * Variables for ip_vs_rht_walk_buckets_safe_rcu
634 */
635 #define DECLARE_IP_VS_RHT_WALK_BUCKETS_SAFE_RCU() \
636 struct ip_vs_rht *_t, *_p; \
637 u32 _bucket
638 /**
639 * ip_vs_rht_walk_buckets_safe_rcu() - Walk all buckets under RCU read lock
640 * @table: struct ip_vs_rht __rcu *table
641 * @head: bucket address, used as cursor, struct hlist_bl_head *var
642 *
643 * Can be used while others add/delete entries but moving is disabled
644 * Using cond_resched_rcu() should be safe if tables do not change
645 */
646 #define ip_vs_rht_walk_buckets_safe_rcu(table, head) \
647 ip_vs_rht_for_each_table_rcu(table, _t, _p) \
648 ip_vs_rht_for_each_bucket(_t, _bucket, head)
649
650 /**
651 * DECLARE_IP_VS_RHT_WALK_BUCKETS() - Declare variables
652 *
653 * Variables for ip_vs_rht_walk_buckets
654 */
655 #define DECLARE_IP_VS_RHT_WALK_BUCKETS() \
656 struct ip_vs_rht *_t, *_p; \
657 u32 _bucket
658
659 /**
660 * ip_vs_rht_walk_buckets() - Walk all buckets
661 * @table: struct ip_vs_rht __rcu *table
662 * @head: bucket address, used as cursor, struct hlist_bl_head *var
663 *
664 * Use if others can not add/delete/move entries
665 */
666 #define ip_vs_rht_walk_buckets(table, head) \
667 ip_vs_rht_for_each_table(table, _t, _p) \
668 ip_vs_rht_for_each_bucket(_t, _bucket, head)
669
670 /* Entries can be in one of two tables, so we flip bit when new table is
671 * created and store it as highest bit in hash keys
672 */
673 #define IP_VS_RHT_TABLE_ID_MASK BIT(31)
674
675 /* Check if hash key is from this table */
ip_vs_rht_same_table(struct ip_vs_rht * t,u32 hash_key)676 static inline bool ip_vs_rht_same_table(struct ip_vs_rht *t, u32 hash_key)
677 {
678 return !((t->table_id ^ hash_key) & IP_VS_RHT_TABLE_ID_MASK);
679 }
680
681 /* Build per-table hash key from hash value */
ip_vs_rht_build_hash_key(struct ip_vs_rht * t,u32 hash)682 static inline u32 ip_vs_rht_build_hash_key(struct ip_vs_rht *t, u32 hash)
683 {
684 return t->table_id | (hash & ~IP_VS_RHT_TABLE_ID_MASK);
685 }
686
687 void ip_vs_rht_free(struct ip_vs_rht *t);
688 void ip_vs_rht_rcu_free(struct rcu_head *head);
689 struct ip_vs_rht *ip_vs_rht_alloc(int buckets, int scounts, int locks);
690 int ip_vs_rht_desired_size(struct netns_ipvs *ipvs, struct ip_vs_rht *t, int n,
691 int lfactor, int min_bits, int max_bits);
692 void ip_vs_rht_set_thresholds(struct ip_vs_rht *t, int size, int lfactor,
693 int min_bits, int max_bits);
694 u32 ip_vs_rht_hash_linfo(struct ip_vs_rht *t, int af,
695 const union nf_inet_addr *addr, u32 v1, u32 v2);
696
697 struct dst_entry;
698 struct iphdr;
699 struct ip_vs_conn;
700 struct ip_vs_app;
701 struct sk_buff;
702 struct ip_vs_proto_data;
703
704 struct ip_vs_protocol {
705 struct ip_vs_protocol *next;
706 char *name;
707 u16 protocol;
708 u16 num_states;
709 int dont_defrag;
710
711 void (*init)(struct ip_vs_protocol *pp);
712
713 void (*exit)(struct ip_vs_protocol *pp);
714
715 int (*init_netns)(struct netns_ipvs *ipvs, struct ip_vs_proto_data *pd);
716
717 void (*exit_netns)(struct netns_ipvs *ipvs, struct ip_vs_proto_data *pd);
718
719 int (*conn_schedule)(struct netns_ipvs *ipvs,
720 int af, struct sk_buff *skb,
721 struct ip_vs_proto_data *pd,
722 int *verdict, struct ip_vs_conn **cpp,
723 struct ip_vs_iphdr *iph);
724
725 struct ip_vs_conn *
726 (*conn_in_get)(struct netns_ipvs *ipvs,
727 int af,
728 const struct sk_buff *skb,
729 const struct ip_vs_iphdr *iph);
730
731 struct ip_vs_conn *
732 (*conn_out_get)(struct netns_ipvs *ipvs,
733 int af,
734 const struct sk_buff *skb,
735 const struct ip_vs_iphdr *iph);
736
737 int (*snat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp,
738 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph);
739
740 int (*dnat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp,
741 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph);
742
743 const char *(*state_name)(int state);
744
745 void (*state_transition)(struct ip_vs_conn *cp, int direction,
746 const struct sk_buff *skb,
747 struct ip_vs_proto_data *pd);
748
749 int (*register_app)(struct netns_ipvs *ipvs, struct ip_vs_app *inc);
750
751 void (*unregister_app)(struct netns_ipvs *ipvs, struct ip_vs_app *inc);
752
753 int (*app_conn_bind)(struct ip_vs_conn *cp);
754
755 void (*debug_packet)(int af, struct ip_vs_protocol *pp,
756 const struct sk_buff *skb,
757 int offset,
758 const char *msg);
759
760 void (*timeout_change)(struct ip_vs_proto_data *pd, int flags);
761 };
762
763 /* protocol data per netns */
764 struct ip_vs_proto_data {
765 struct ip_vs_proto_data *next;
766 struct ip_vs_protocol *pp;
767 int *timeout_table; /* protocol timeout table */
768 atomic_t appcnt; /* counter of proto app incs. */
769 struct tcp_states_t *tcp_state_table;
770 };
771
772 struct ip_vs_protocol *ip_vs_proto_get(unsigned short proto);
773 struct ip_vs_proto_data *ip_vs_proto_data_get(struct netns_ipvs *ipvs,
774 unsigned short proto);
775
776 struct ip_vs_conn_param {
777 struct netns_ipvs *ipvs;
778 const union nf_inet_addr *caddr;
779 const union nf_inet_addr *vaddr;
780 __be16 cport;
781 __be16 vport;
782 __u16 protocol;
783 u16 af;
784
785 const struct ip_vs_pe *pe;
786 char *pe_data;
787 __u8 pe_data_len;
788 };
789
790 /* Hash node in conn_tab */
791 struct ip_vs_conn_hnode {
792 struct hlist_bl_node node; /* node in conn_tab */
793 u32 hash_key; /* Key for the hash table */
794 u8 dir; /* 0=out->in, 1=in->out */
795 } __packed;
796
797 /* IP_VS structure allocated for each dynamically scheduled connection */
798 struct ip_vs_conn {
799 /* Cacheline for hash table nodes - rarely modified */
800
801 struct ip_vs_conn_hnode hn0; /* Original direction */
802 u8 af; /* address family */
803 __be16 cport;
804 struct ip_vs_conn_hnode hn1; /* Reply direction */
805 u8 daf; /* Address family of the dest */
806 __be16 dport;
807 struct ip_vs_dest *dest; /* real server */
808 atomic_t n_control; /* Number of controlled ones */
809 volatile __u32 flags; /* status flags */
810 /* 44/64 */
811
812 struct ip_vs_conn *control; /* Master control connection */
813 const struct ip_vs_pe *pe;
814 char *pe_data;
815 __u8 pe_data_len;
816 volatile __u16 state; /* state info */
817 volatile __u16 old_state; /* old state, to be used for
818 * state transition triggered
819 * synchronization
820 */
821 /* 2-byte hole */
822 /* 64/96 */
823
824 union nf_inet_addr caddr; /* client address */
825 union nf_inet_addr vaddr; /* virtual address */
826 /* 96/128 */
827
828 union nf_inet_addr daddr; /* destination address */
829 __u32 fwmark; /* Fire wall mark from skb */
830 __be16 vport;
831 __u16 protocol; /* Which protocol (TCP/UDP) */
832
833 /* Note: we can group the following members into a structure,
834 * in order to save more space, and the following members are
835 * only used in VS/NAT anyway
836 */
837 struct ip_vs_app *app; /* bound ip_vs_app object */
838 void *app_data; /* Application private data */
839 /* 128/168 */
840 struct_group(sync_conn_opt,
841 struct ip_vs_seq in_seq; /* incoming seq. struct */
842 struct ip_vs_seq out_seq; /* outgoing seq. struct */
843 );
844 /* 152/192 */
845
846 struct timer_list timer; /* Expiration timer */
847 volatile unsigned long timeout; /* timeout */
848 spinlock_t lock; /* lock for state transition */
849 refcount_t refcnt; /* reference count */
850 atomic_t in_pkts; /* incoming packet counter */
851 /* 64-bit: 4-byte gap */
852
853 /* 188/256 */
854 unsigned long sync_endtime; /* jiffies + sent_retries */
855 struct netns_ipvs *ipvs;
856
857 /* Packet transmitter for different forwarding methods. If it
858 * mangles the packet, it must return NF_DROP or better NF_STOLEN,
859 * otherwise this must be changed to a sk_buff **.
860 * NF_ACCEPT can be returned when destination is local.
861 */
862 int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp,
863 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
864
865 struct rcu_head rcu_head;
866 };
867
868 /* Extended internal versions of struct ip_vs_service_user and ip_vs_dest_user
869 * for IPv6 support.
870 *
871 * We need these to conveniently pass around service and destination
872 * options, but unfortunately, we also need to keep the old definitions to
873 * maintain userspace backwards compatibility for the setsockopt interface.
874 */
875 struct ip_vs_service_user_kern {
876 /* virtual service addresses */
877 u16 af;
878 u16 protocol;
879 union nf_inet_addr addr; /* virtual ip address */
880 __be16 port;
881 u32 fwmark; /* firewall mark of service */
882
883 /* virtual service options */
884 char *sched_name;
885 char *pe_name;
886 unsigned int flags; /* virtual service flags */
887 unsigned int timeout; /* persistent timeout in sec */
888 __be32 netmask; /* persistent netmask or plen */
889 };
890
891
892 struct ip_vs_dest_user_kern {
893 /* destination server address */
894 union nf_inet_addr addr;
895 __be16 port;
896
897 /* real server options */
898 unsigned int conn_flags; /* connection flags */
899 int weight; /* destination weight */
900
901 /* thresholds for active connections */
902 u32 u_threshold; /* upper threshold */
903 u32 l_threshold; /* lower threshold */
904
905 /* Address family of addr */
906 u16 af;
907
908 u16 tun_type; /* tunnel type */
909 __be16 tun_port; /* tunnel port */
910 u16 tun_flags; /* tunnel flags */
911 };
912
913
914 /*
915 * The information about the virtual service offered to the net and the
916 * forwarding entries.
917 */
918 struct ip_vs_service {
919 struct hlist_bl_node s_list; /* node in service table */
920 u32 hash_key; /* Key for the hash table */
921 u16 af; /* address family */
922 __u16 protocol; /* which protocol (TCP/UDP) */
923
924 union nf_inet_addr addr; /* IP address for virtual service */
925 __u32 fwmark; /* firewall mark of the service */
926 atomic_t refcnt; /* reference counter */
927 __be16 port; /* port number for the service */
928 unsigned int flags; /* service status flags */
929 unsigned int timeout; /* persistent timeout in ticks */
930 __be32 netmask; /* grouping granularity, mask/plen */
931 struct netns_ipvs *ipvs;
932
933 struct list_head destinations; /* real server d-linked list */
934 __u32 num_dests; /* number of servers */
935 struct ip_vs_stats stats; /* statistics for the service */
936
937 /* for scheduling */
938 struct ip_vs_scheduler __rcu *scheduler; /* bound scheduler object */
939 spinlock_t sched_lock; /* lock sched_data */
940 void *sched_data; /* scheduler application data */
941
942 /* alternate persistence engine */
943 struct ip_vs_pe __rcu *pe;
944 int conntrack_afmask;
945
946 struct rcu_head rcu_head;
947 };
948
949 /* Information for cached dst */
950 struct ip_vs_dest_dst {
951 struct dst_entry *dst_cache; /* destination cache entry */
952 u32 dst_cookie;
953 union nf_inet_addr dst_saddr;
954 struct rcu_head rcu_head;
955 };
956
957 /* The real server destination forwarding entry with ip address, port number,
958 * and so on.
959 */
960 struct ip_vs_dest {
961 struct list_head n_list; /* for the dests in the service */
962 struct hlist_node d_list; /* for table with all the dests */
963
964 u16 af; /* address family */
965 __be16 port; /* port number of the server */
966 union nf_inet_addr addr; /* IP address of the server */
967 volatile unsigned int flags; /* dest status flags */
968 atomic_t conn_flags; /* flags to copy to conn */
969 atomic_t weight; /* server weight */
970 atomic_t last_weight; /* server latest weight */
971 __u16 tun_type; /* tunnel type */
972 __be16 tun_port; /* tunnel port */
973 __u16 tun_flags; /* tunnel flags */
974
975 refcount_t refcnt; /* reference counter */
976 struct ip_vs_stats stats; /* statistics */
977 unsigned long idle_start; /* start time, jiffies */
978
979 /* connection counters and thresholds */
980 atomic_t activeconns; /* active connections */
981 atomic_t inactconns; /* inactive connections */
982 atomic_t persistconns; /* persistent connections */
983 __u32 u_threshold; /* upper threshold */
984 __u32 l_threshold; /* lower threshold */
985
986 /* for destination cache */
987 spinlock_t dst_lock; /* lock of dst_cache */
988 struct ip_vs_dest_dst __rcu *dest_dst; /* cached dst info */
989
990 /* for virtual service */
991 struct ip_vs_service __rcu *svc; /* service it belongs to */
992 __u16 protocol; /* which protocol (TCP/UDP) */
993 __be16 vport; /* virtual port number */
994 union nf_inet_addr vaddr; /* virtual IP address */
995 __u32 vfwmark; /* firewall mark of service */
996
997 struct rcu_head rcu_head;
998 struct list_head t_list; /* in dest_trash */
999 unsigned int in_rs_table:1; /* we are in rs_table */
1000 };
1001
1002 /* The scheduler object */
1003 struct ip_vs_scheduler {
1004 struct list_head n_list; /* d-linked list head */
1005 char *name; /* scheduler name */
1006 atomic_t refcnt; /* reference counter */
1007 struct module *module; /* THIS_MODULE/NULL */
1008
1009 /* scheduler initializing service */
1010 int (*init_service)(struct ip_vs_service *svc);
1011 /* scheduling service finish */
1012 void (*done_service)(struct ip_vs_service *svc);
1013 /* dest is linked */
1014 int (*add_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
1015 /* dest is unlinked */
1016 int (*del_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
1017 /* dest is updated */
1018 int (*upd_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
1019
1020 /* selecting a server from the given service */
1021 struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc,
1022 const struct sk_buff *skb,
1023 struct ip_vs_iphdr *iph);
1024 };
1025
1026 /* The persistence engine object */
1027 struct ip_vs_pe {
1028 struct list_head n_list; /* d-linked list head */
1029 char *name; /* scheduler name */
1030 atomic_t refcnt; /* reference counter */
1031 struct module *module; /* THIS_MODULE/NULL */
1032
1033 /* get the connection template, if any */
1034 int (*fill_param)(struct ip_vs_conn_param *p, struct sk_buff *skb);
1035 bool (*ct_match)(const struct ip_vs_conn_param *p,
1036 struct ip_vs_conn *ct);
1037 u32 (*hashkey_raw)(const struct ip_vs_conn_param *p,
1038 struct ip_vs_rht *t, bool inverse);
1039 int (*show_pe_data)(const struct ip_vs_conn *cp, char *buf);
1040 /* create connections for real-server outgoing packets */
1041 struct ip_vs_conn* (*conn_out)(struct ip_vs_service *svc,
1042 struct ip_vs_dest *dest,
1043 struct sk_buff *skb,
1044 const struct ip_vs_iphdr *iph,
1045 __be16 dport, __be16 cport);
1046 };
1047
1048 /* The application module object (a.k.a. app incarnation) */
1049 struct ip_vs_app {
1050 struct list_head a_list; /* member in app list */
1051 int type; /* IP_VS_APP_TYPE_xxx */
1052 char *name; /* application module name */
1053 __u16 protocol;
1054 struct module *module; /* THIS_MODULE/NULL */
1055 struct list_head incs_list; /* list of incarnations */
1056
1057 /* members for application incarnations */
1058 struct list_head p_list; /* member in proto app list */
1059 struct ip_vs_app *app; /* its real application */
1060 __be16 port; /* port number in net order */
1061 atomic_t usecnt; /* usage counter */
1062 struct rcu_head rcu_head;
1063
1064 /* output hook: Process packet in inout direction, diff set for TCP.
1065 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
1066 * 2=Mangled but checksum was not updated
1067 */
1068 int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *,
1069 struct sk_buff *, int *diff, struct ip_vs_iphdr *ipvsh);
1070
1071 /* input hook: Process packet in outin direction, diff set for TCP.
1072 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
1073 * 2=Mangled but checksum was not updated
1074 */
1075 int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *,
1076 struct sk_buff *, int *diff, struct ip_vs_iphdr *ipvsh);
1077
1078 /* ip_vs_app initializer */
1079 int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *);
1080
1081 /* ip_vs_app finish */
1082 int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *);
1083
1084
1085 /* not used now */
1086 int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *,
1087 struct ip_vs_protocol *);
1088
1089 void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *);
1090
1091 int * timeout_table;
1092 int * timeouts;
1093 int timeouts_size;
1094
1095 int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app,
1096 int *verdict, struct ip_vs_conn **cpp);
1097
1098 struct ip_vs_conn *
1099 (*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app,
1100 const struct iphdr *iph, int inverse);
1101
1102 struct ip_vs_conn *
1103 (*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app,
1104 const struct iphdr *iph, int inverse);
1105
1106 int (*state_transition)(struct ip_vs_conn *cp, int direction,
1107 const struct sk_buff *skb,
1108 struct ip_vs_app *app);
1109
1110 void (*timeout_change)(struct ip_vs_app *app, int flags);
1111 };
1112
1113 struct ipvs_master_sync_state {
1114 struct list_head sync_queue;
1115 struct ip_vs_sync_buff *sync_buff;
1116 unsigned long sync_queue_len;
1117 unsigned int sync_queue_delay;
1118 struct delayed_work master_wakeup_work;
1119 struct netns_ipvs *ipvs;
1120 };
1121
1122 struct ip_vs_sync_thread_data;
1123
1124 /* How much time to keep dests in trash */
1125 #define IP_VS_DEST_TRASH_PERIOD (120 * HZ)
1126
1127 struct ipvs_sync_daemon_cfg {
1128 union nf_inet_addr mcast_group;
1129 int syncid;
1130 u16 sync_maxlen;
1131 u16 mcast_port;
1132 u8 mcast_af;
1133 u8 mcast_ttl;
1134 /* multicast interface name */
1135 char mcast_ifn[IP_VS_IFNAME_MAXLEN];
1136 };
1137
1138 /* IPVS in network namespace */
1139 struct netns_ipvs {
1140 int gen; /* Generation */
1141 int enable; /* enable like nf_hooks do */
1142 /* Hash table: for real service lookups */
1143 #define IP_VS_RTAB_BITS 4
1144 #define IP_VS_RTAB_SIZE (1 << IP_VS_RTAB_BITS)
1145 #define IP_VS_RTAB_MASK (IP_VS_RTAB_SIZE - 1)
1146
1147 struct hlist_head rs_table[IP_VS_RTAB_SIZE];
1148 /* ip_vs_app */
1149 struct list_head app_list;
1150 /* ip_vs_proto */
1151 #define IP_VS_PROTO_TAB_SIZE 32 /* must be power of 2 */
1152 struct ip_vs_proto_data *proto_data_table[IP_VS_PROTO_TAB_SIZE];
1153 /* ip_vs_proto_tcp */
1154 #ifdef CONFIG_IP_VS_PROTO_TCP
1155 #define TCP_APP_TAB_BITS 4
1156 #define TCP_APP_TAB_SIZE (1 << TCP_APP_TAB_BITS)
1157 #define TCP_APP_TAB_MASK (TCP_APP_TAB_SIZE - 1)
1158 struct list_head tcp_apps[TCP_APP_TAB_SIZE];
1159 #endif
1160 /* ip_vs_proto_udp */
1161 #ifdef CONFIG_IP_VS_PROTO_UDP
1162 #define UDP_APP_TAB_BITS 4
1163 #define UDP_APP_TAB_SIZE (1 << UDP_APP_TAB_BITS)
1164 #define UDP_APP_TAB_MASK (UDP_APP_TAB_SIZE - 1)
1165 struct list_head udp_apps[UDP_APP_TAB_SIZE];
1166 #endif
1167 /* ip_vs_proto_sctp */
1168 #ifdef CONFIG_IP_VS_PROTO_SCTP
1169 #define SCTP_APP_TAB_BITS 4
1170 #define SCTP_APP_TAB_SIZE (1 << SCTP_APP_TAB_BITS)
1171 #define SCTP_APP_TAB_MASK (SCTP_APP_TAB_SIZE - 1)
1172 /* Hash table for SCTP application incarnations */
1173 struct list_head sctp_apps[SCTP_APP_TAB_SIZE];
1174 #endif
1175 /* ip_vs_conn */
1176 atomic_t conn_count; /* connection counter */
1177 atomic_t no_cport_conns[IP_VS_AF_MAX];
1178 struct delayed_work conn_resize_work;/* resize conn_tab */
1179
1180 /* ip_vs_ctl */
1181 struct ip_vs_stats_rcu *tot_stats; /* Statistics & est. */
1182
1183 /* Trash for destinations */
1184 struct list_head dest_trash;
1185 spinlock_t dest_trash_lock;
1186 struct timer_list dest_trash_timer; /* expiration timer */
1187 struct mutex service_mutex; /* service reconfig */
1188 struct rw_semaphore svc_resize_sem; /* svc_table resizing */
1189 struct rw_semaphore svc_replace_sem; /* svc_table replace */
1190 struct delayed_work svc_resize_work; /* resize svc_table */
1191 atomic_t svc_table_changes;/* ++ on table changes */
1192 /* Service counters */
1193 atomic_t num_services[IP_VS_AF_MAX]; /* Services */
1194 atomic_t fwm_services[IP_VS_AF_MAX]; /* Services */
1195 atomic_t nonfwm_services[IP_VS_AF_MAX];/* Services */
1196 atomic_t ftpsvc_counter[IP_VS_AF_MAX]; /* FTPPORT */
1197 atomic_t nullsvc_counter[IP_VS_AF_MAX];/* Zero port */
1198 atomic_t conn_out_counter[IP_VS_AF_MAX];/* out conn */
1199
1200 #ifdef CONFIG_SYSCTL
1201 /* delayed work for expiring no dest connections */
1202 struct delayed_work expire_nodest_conn_work;
1203 /* 1/rate drop and drop-entry variables */
1204 struct delayed_work defense_work; /* Work handler */
1205 int drop_rate;
1206 int drop_counter;
1207 int old_secure_tcp;
1208 atomic_t dropentry;
1209 s8 dropentry_counters[8];
1210 /* locks in ctl.c */
1211 spinlock_t dropentry_lock; /* drop entry handling */
1212 spinlock_t droppacket_lock; /* drop packet handling */
1213 spinlock_t securetcp_lock; /* state and timeout tables */
1214
1215 /* sys-ctl struct */
1216 struct ctl_table_header *sysctl_hdr;
1217 struct ctl_table *sysctl_tbl;
1218 #endif
1219
1220 /* sysctl variables */
1221 int sysctl_amemthresh;
1222 int sysctl_am_droprate;
1223 int sysctl_drop_entry;
1224 int sysctl_drop_packet;
1225 int sysctl_secure_tcp;
1226 #ifdef CONFIG_IP_VS_NFCT
1227 int sysctl_conntrack;
1228 #endif
1229 int sysctl_snat_reroute;
1230 int sysctl_sync_ver;
1231 int sysctl_sync_ports;
1232 int sysctl_sync_persist_mode;
1233 unsigned long sysctl_sync_qlen_max;
1234 int sysctl_sync_sock_size;
1235 int sysctl_cache_bypass;
1236 int sysctl_expire_nodest_conn;
1237 int sysctl_sloppy_tcp;
1238 int sysctl_sloppy_sctp;
1239 int sysctl_expire_quiescent_template;
1240 int sysctl_sync_threshold[2];
1241 unsigned int sysctl_sync_refresh_period;
1242 int sysctl_sync_retries;
1243 int sysctl_nat_icmp_send;
1244 int sysctl_pmtu_disc;
1245 int sysctl_backup_only;
1246 int sysctl_conn_reuse_mode;
1247 int sysctl_schedule_icmp;
1248 int sysctl_ignore_tunneled;
1249 int sysctl_run_estimation;
1250 #ifdef CONFIG_SYSCTL
1251 cpumask_var_t sysctl_est_cpulist; /* kthread cpumask */
1252 int est_cpulist_valid; /* cpulist set */
1253 int sysctl_est_nice; /* kthread nice */
1254 int est_stopped; /* stop tasks */
1255 #endif
1256 int sysctl_conn_lfactor;
1257 int sysctl_svc_lfactor;
1258
1259 /* ip_vs_lblc */
1260 int sysctl_lblc_expiration;
1261 struct ctl_table_header *lblc_ctl_header;
1262 struct ctl_table *lblc_ctl_table;
1263 /* ip_vs_lblcr */
1264 int sysctl_lblcr_expiration;
1265 struct ctl_table_header *lblcr_ctl_header;
1266 struct ctl_table *lblcr_ctl_table;
1267 unsigned long work_flags; /* IP_VS_WORK_* flags */
1268 /* ip_vs_est */
1269 struct delayed_work est_reload_work;/* Reload kthread tasks */
1270 struct mutex est_mutex; /* protect kthread tasks */
1271 struct hlist_head est_temp_list; /* Ests during calc phase */
1272 struct ip_vs_est_kt_data **est_kt_arr; /* Array of kthread data ptrs */
1273 unsigned long est_max_threads;/* Hard limit of kthreads */
1274 int est_calc_phase; /* Calculation phase */
1275 int est_chain_max; /* Calculated chain_max */
1276 int est_kt_count; /* Allocated ptrs */
1277 int est_add_ktid; /* ktid where to add ests */
1278 atomic_t est_genid; /* kthreads reload genid */
1279 atomic_t est_genid_done; /* applied genid */
1280 /* ip_vs_sync */
1281 spinlock_t sync_lock;
1282 struct ipvs_master_sync_state *ms;
1283 spinlock_t sync_buff_lock;
1284 struct ip_vs_sync_thread_data *master_tinfo;
1285 struct ip_vs_sync_thread_data *backup_tinfo;
1286 int threads_mask;
1287 volatile int sync_state;
1288 struct mutex sync_mutex;
1289 struct ipvs_sync_daemon_cfg mcfg; /* Master Configuration */
1290 struct ipvs_sync_daemon_cfg bcfg; /* Backup Configuration */
1291 /* net name space ptr */
1292 struct net *net; /* Needed by timer routines */
1293 /* Number of heterogeneous destinations, needed because heterogeneous
1294 * are not supported when synchronization is enabled.
1295 */
1296 unsigned int mixed_address_family_dests;
1297 unsigned int hooks_afmask; /* &1=AF_INET, &2=AF_INET6 */
1298
1299 struct ip_vs_rht __rcu *svc_table; /* Services */
1300 struct ip_vs_rht __rcu *conn_tab; /* Connections */
1301 atomic_t conn_tab_changes;/* ++ on new table */
1302 };
1303
1304 #define DEFAULT_SYNC_THRESHOLD 3
1305 #define DEFAULT_SYNC_PERIOD 50
1306 #define DEFAULT_SYNC_VER 1
1307 #define DEFAULT_SLOPPY_TCP 0
1308 #define DEFAULT_SLOPPY_SCTP 0
1309 #define DEFAULT_SYNC_REFRESH_PERIOD (0U * HZ)
1310 #define DEFAULT_SYNC_RETRIES 0
1311 #define IPVS_SYNC_WAKEUP_RATE 8
1312 #define IPVS_SYNC_QLEN_MAX (IPVS_SYNC_WAKEUP_RATE * 4)
1313 #define IPVS_SYNC_SEND_DELAY (HZ / 50)
1314 #define IPVS_SYNC_CHECK_PERIOD HZ
1315 #define IPVS_SYNC_FLUSH_TIME (HZ * 2)
1316 #define IPVS_SYNC_PORTS_MAX (1 << 6)
1317
1318 #ifdef CONFIG_SYSCTL
1319
sysctl_sync_threshold(struct netns_ipvs * ipvs)1320 static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
1321 {
1322 return ipvs->sysctl_sync_threshold[0];
1323 }
1324
sysctl_sync_period(struct netns_ipvs * ipvs)1325 static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
1326 {
1327 return READ_ONCE(ipvs->sysctl_sync_threshold[1]);
1328 }
1329
sysctl_sync_refresh_period(struct netns_ipvs * ipvs)1330 static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
1331 {
1332 return READ_ONCE(ipvs->sysctl_sync_refresh_period);
1333 }
1334
sysctl_sync_retries(struct netns_ipvs * ipvs)1335 static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
1336 {
1337 return ipvs->sysctl_sync_retries;
1338 }
1339
sysctl_sync_ver(struct netns_ipvs * ipvs)1340 static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
1341 {
1342 return ipvs->sysctl_sync_ver;
1343 }
1344
sysctl_sloppy_tcp(struct netns_ipvs * ipvs)1345 static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs)
1346 {
1347 return ipvs->sysctl_sloppy_tcp;
1348 }
1349
sysctl_sloppy_sctp(struct netns_ipvs * ipvs)1350 static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs)
1351 {
1352 return ipvs->sysctl_sloppy_sctp;
1353 }
1354
sysctl_sync_ports(struct netns_ipvs * ipvs)1355 static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
1356 {
1357 return READ_ONCE(ipvs->sysctl_sync_ports);
1358 }
1359
sysctl_sync_persist_mode(struct netns_ipvs * ipvs)1360 static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs)
1361 {
1362 return ipvs->sysctl_sync_persist_mode;
1363 }
1364
sysctl_sync_qlen_max(struct netns_ipvs * ipvs)1365 static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
1366 {
1367 return ipvs->sysctl_sync_qlen_max;
1368 }
1369
sysctl_sync_sock_size(struct netns_ipvs * ipvs)1370 static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
1371 {
1372 return ipvs->sysctl_sync_sock_size;
1373 }
1374
sysctl_pmtu_disc(struct netns_ipvs * ipvs)1375 static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
1376 {
1377 return ipvs->sysctl_pmtu_disc;
1378 }
1379
sysctl_backup_only(struct netns_ipvs * ipvs)1380 static inline int sysctl_backup_only(struct netns_ipvs *ipvs)
1381 {
1382 return ipvs->sync_state & IP_VS_STATE_BACKUP &&
1383 ipvs->sysctl_backup_only;
1384 }
1385
sysctl_conn_reuse_mode(struct netns_ipvs * ipvs)1386 static inline int sysctl_conn_reuse_mode(struct netns_ipvs *ipvs)
1387 {
1388 return ipvs->sysctl_conn_reuse_mode;
1389 }
1390
sysctl_expire_nodest_conn(struct netns_ipvs * ipvs)1391 static inline int sysctl_expire_nodest_conn(struct netns_ipvs *ipvs)
1392 {
1393 return ipvs->sysctl_expire_nodest_conn;
1394 }
1395
sysctl_schedule_icmp(struct netns_ipvs * ipvs)1396 static inline int sysctl_schedule_icmp(struct netns_ipvs *ipvs)
1397 {
1398 return ipvs->sysctl_schedule_icmp;
1399 }
1400
sysctl_ignore_tunneled(struct netns_ipvs * ipvs)1401 static inline int sysctl_ignore_tunneled(struct netns_ipvs *ipvs)
1402 {
1403 return ipvs->sysctl_ignore_tunneled;
1404 }
1405
sysctl_cache_bypass(struct netns_ipvs * ipvs)1406 static inline int sysctl_cache_bypass(struct netns_ipvs *ipvs)
1407 {
1408 return ipvs->sysctl_cache_bypass;
1409 }
1410
sysctl_run_estimation(struct netns_ipvs * ipvs)1411 static inline int sysctl_run_estimation(struct netns_ipvs *ipvs)
1412 {
1413 return ipvs->sysctl_run_estimation;
1414 }
1415
__sysctl_est_cpulist(struct netns_ipvs * ipvs)1416 static inline const struct cpumask *__sysctl_est_cpulist(struct netns_ipvs *ipvs)
1417 {
1418 if (ipvs->est_cpulist_valid)
1419 return ipvs->sysctl_est_cpulist;
1420 else
1421 return housekeeping_cpumask(HK_TYPE_KTHREAD);
1422 }
1423
sysctl_est_preferred_cpulist(struct netns_ipvs * ipvs)1424 static inline const struct cpumask *sysctl_est_preferred_cpulist(struct netns_ipvs *ipvs)
1425 {
1426 if (ipvs->est_cpulist_valid)
1427 return ipvs->sysctl_est_cpulist;
1428 else
1429 return NULL;
1430 }
1431
sysctl_est_nice(struct netns_ipvs * ipvs)1432 static inline int sysctl_est_nice(struct netns_ipvs *ipvs)
1433 {
1434 return ipvs->sysctl_est_nice;
1435 }
1436
1437 #else
1438
sysctl_sync_threshold(struct netns_ipvs * ipvs)1439 static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
1440 {
1441 return DEFAULT_SYNC_THRESHOLD;
1442 }
1443
sysctl_sync_period(struct netns_ipvs * ipvs)1444 static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
1445 {
1446 return DEFAULT_SYNC_PERIOD;
1447 }
1448
sysctl_sync_refresh_period(struct netns_ipvs * ipvs)1449 static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
1450 {
1451 return DEFAULT_SYNC_REFRESH_PERIOD;
1452 }
1453
sysctl_sync_retries(struct netns_ipvs * ipvs)1454 static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
1455 {
1456 return DEFAULT_SYNC_RETRIES & 3;
1457 }
1458
sysctl_sync_ver(struct netns_ipvs * ipvs)1459 static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
1460 {
1461 return DEFAULT_SYNC_VER;
1462 }
1463
sysctl_sloppy_tcp(struct netns_ipvs * ipvs)1464 static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs)
1465 {
1466 return DEFAULT_SLOPPY_TCP;
1467 }
1468
sysctl_sloppy_sctp(struct netns_ipvs * ipvs)1469 static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs)
1470 {
1471 return DEFAULT_SLOPPY_SCTP;
1472 }
1473
sysctl_sync_ports(struct netns_ipvs * ipvs)1474 static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
1475 {
1476 return 1;
1477 }
1478
sysctl_sync_persist_mode(struct netns_ipvs * ipvs)1479 static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs)
1480 {
1481 return 0;
1482 }
1483
sysctl_sync_qlen_max(struct netns_ipvs * ipvs)1484 static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
1485 {
1486 return IPVS_SYNC_QLEN_MAX;
1487 }
1488
sysctl_sync_sock_size(struct netns_ipvs * ipvs)1489 static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
1490 {
1491 return 0;
1492 }
1493
sysctl_pmtu_disc(struct netns_ipvs * ipvs)1494 static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
1495 {
1496 return 1;
1497 }
1498
sysctl_backup_only(struct netns_ipvs * ipvs)1499 static inline int sysctl_backup_only(struct netns_ipvs *ipvs)
1500 {
1501 return 0;
1502 }
1503
sysctl_conn_reuse_mode(struct netns_ipvs * ipvs)1504 static inline int sysctl_conn_reuse_mode(struct netns_ipvs *ipvs)
1505 {
1506 return 1;
1507 }
1508
sysctl_expire_nodest_conn(struct netns_ipvs * ipvs)1509 static inline int sysctl_expire_nodest_conn(struct netns_ipvs *ipvs)
1510 {
1511 return 0;
1512 }
1513
sysctl_schedule_icmp(struct netns_ipvs * ipvs)1514 static inline int sysctl_schedule_icmp(struct netns_ipvs *ipvs)
1515 {
1516 return 0;
1517 }
1518
sysctl_ignore_tunneled(struct netns_ipvs * ipvs)1519 static inline int sysctl_ignore_tunneled(struct netns_ipvs *ipvs)
1520 {
1521 return 0;
1522 }
1523
sysctl_cache_bypass(struct netns_ipvs * ipvs)1524 static inline int sysctl_cache_bypass(struct netns_ipvs *ipvs)
1525 {
1526 return 0;
1527 }
1528
sysctl_run_estimation(struct netns_ipvs * ipvs)1529 static inline int sysctl_run_estimation(struct netns_ipvs *ipvs)
1530 {
1531 return 1;
1532 }
1533
__sysctl_est_cpulist(struct netns_ipvs * ipvs)1534 static inline const struct cpumask *__sysctl_est_cpulist(struct netns_ipvs *ipvs)
1535 {
1536 return housekeeping_cpumask(HK_TYPE_KTHREAD);
1537 }
1538
sysctl_est_preferred_cpulist(struct netns_ipvs * ipvs)1539 static inline const struct cpumask *sysctl_est_preferred_cpulist(struct netns_ipvs *ipvs)
1540 {
1541 return NULL;
1542 }
1543
sysctl_est_nice(struct netns_ipvs * ipvs)1544 static inline int sysctl_est_nice(struct netns_ipvs *ipvs)
1545 {
1546 return IPVS_EST_NICE;
1547 }
1548
1549 #endif
1550
1551 /* Get load factor to map conn_count/u_thresh to t->size */
sysctl_conn_lfactor(struct netns_ipvs * ipvs)1552 static inline int sysctl_conn_lfactor(struct netns_ipvs *ipvs)
1553 {
1554 return READ_ONCE(ipvs->sysctl_conn_lfactor);
1555 }
1556
1557 /* Get load factor to map num_services/u_thresh to t->size
1558 * Smaller value decreases u_thresh to reduce collisions but increases
1559 * the table size
1560 * Returns factor where:
1561 * - <0: u_thresh = size >> -factor, eg. lfactor -2 = 25% load
1562 * - >=0: u_thresh = size << factor, eg. lfactor 1 = 200% load
1563 */
sysctl_svc_lfactor(struct netns_ipvs * ipvs)1564 static inline int sysctl_svc_lfactor(struct netns_ipvs *ipvs)
1565 {
1566 return READ_ONCE(ipvs->sysctl_svc_lfactor);
1567 }
1568
sysctl_est_cpulist_empty(struct netns_ipvs * ipvs)1569 static inline bool sysctl_est_cpulist_empty(struct netns_ipvs *ipvs)
1570 {
1571 guard(rcu)();
1572 return cpumask_empty(__sysctl_est_cpulist(ipvs));
1573 }
1574
sysctl_est_cpulist_weight(struct netns_ipvs * ipvs)1575 static inline unsigned int sysctl_est_cpulist_weight(struct netns_ipvs *ipvs)
1576 {
1577 guard(rcu)();
1578 return cpumask_weight(__sysctl_est_cpulist(ipvs));
1579 }
1580
1581 /* IPVS core functions
1582 * (from ip_vs_core.c)
1583 */
1584 const char *ip_vs_proto_name(unsigned int proto);
1585 void ip_vs_init_hash_table(struct list_head *table, int rows);
1586 struct ip_vs_conn *ip_vs_new_conn_out(struct ip_vs_service *svc,
1587 struct ip_vs_dest *dest,
1588 struct sk_buff *skb,
1589 const struct ip_vs_iphdr *iph,
1590 __be16 dport,
1591 __be16 cport);
1592 #define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table((t), ARRAY_SIZE((t)))
1593
1594 #define IP_VS_APP_TYPE_FTP 1
1595
1596 /* ip_vs_conn handling functions
1597 * (from ip_vs_conn.c)
1598 */
1599 enum {
1600 IP_VS_DIR_INPUT = 0,
1601 IP_VS_DIR_OUTPUT,
1602 IP_VS_DIR_INPUT_ONLY,
1603 IP_VS_DIR_LAST,
1604 };
1605
ip_vs_conn_fill_param(struct netns_ipvs * ipvs,int af,int protocol,const union nf_inet_addr * caddr,__be16 cport,const union nf_inet_addr * vaddr,__be16 vport,struct ip_vs_conn_param * p)1606 static inline void ip_vs_conn_fill_param(struct netns_ipvs *ipvs, int af, int protocol,
1607 const union nf_inet_addr *caddr,
1608 __be16 cport,
1609 const union nf_inet_addr *vaddr,
1610 __be16 vport,
1611 struct ip_vs_conn_param *p)
1612 {
1613 p->ipvs = ipvs;
1614 p->af = af;
1615 p->protocol = protocol;
1616 p->caddr = caddr;
1617 p->cport = cport;
1618 p->vaddr = vaddr;
1619 p->vport = vport;
1620 p->pe = NULL;
1621 p->pe_data = NULL;
1622 }
1623
1624 struct ip_vs_conn *ip_vs_conn_in_get(const struct ip_vs_conn_param *p);
1625 struct ip_vs_conn *ip_vs_ct_in_get(const struct ip_vs_conn_param *p);
1626
1627 struct ip_vs_conn * ip_vs_conn_in_get_proto(struct netns_ipvs *ipvs, int af,
1628 const struct sk_buff *skb,
1629 const struct ip_vs_iphdr *iph);
1630
1631 struct ip_vs_conn *ip_vs_conn_out_get(const struct ip_vs_conn_param *p);
1632
1633 struct ip_vs_conn * ip_vs_conn_out_get_proto(struct netns_ipvs *ipvs, int af,
1634 const struct sk_buff *skb,
1635 const struct ip_vs_iphdr *iph);
1636
1637 /* Get reference to gain full access to conn.
1638 * By default, RCU read-side critical sections have access only to
1639 * conn fields and its PE data, see ip_vs_conn_rcu_free() for reference.
1640 */
__ip_vs_conn_get(struct ip_vs_conn * cp)1641 static inline bool __ip_vs_conn_get(struct ip_vs_conn *cp)
1642 {
1643 return refcount_inc_not_zero(&cp->refcnt);
1644 }
1645
1646 /* put back the conn without restarting its timer */
__ip_vs_conn_put(struct ip_vs_conn * cp)1647 static inline void __ip_vs_conn_put(struct ip_vs_conn *cp)
1648 {
1649 smp_mb__before_atomic();
1650 refcount_dec(&cp->refcnt);
1651 }
1652 void ip_vs_conn_put(struct ip_vs_conn *cp);
1653 void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport);
1654 int ip_vs_conn_desired_size(struct netns_ipvs *ipvs, struct ip_vs_rht *t,
1655 int lfactor);
1656 struct ip_vs_rht *ip_vs_conn_tab_alloc(struct netns_ipvs *ipvs, int buckets,
1657 int lfactor);
1658
1659 static inline struct ip_vs_conn *
ip_vs_hn0_to_conn(struct ip_vs_conn_hnode * hn)1660 ip_vs_hn0_to_conn(struct ip_vs_conn_hnode *hn)
1661 {
1662 return container_of(hn, struct ip_vs_conn, hn0);
1663 }
1664
1665 static inline struct ip_vs_conn *
ip_vs_hn_to_conn(struct ip_vs_conn_hnode * hn)1666 ip_vs_hn_to_conn(struct ip_vs_conn_hnode *hn)
1667 {
1668 return hn->dir ? container_of(hn, struct ip_vs_conn, hn1) :
1669 container_of(hn, struct ip_vs_conn, hn0);
1670 }
1671
1672 struct ip_vs_conn *ip_vs_conn_new(const struct ip_vs_conn_param *p, int dest_af,
1673 const union nf_inet_addr *daddr,
1674 __be16 dport, unsigned int flags,
1675 struct ip_vs_dest *dest, __u32 fwmark);
1676 void ip_vs_conn_expire_now(struct ip_vs_conn *cp);
1677
1678 const char *ip_vs_state_name(const struct ip_vs_conn *cp);
1679
1680 void ip_vs_tcp_conn_listen(struct ip_vs_conn *cp);
1681 int ip_vs_check_template(struct ip_vs_conn *ct, struct ip_vs_dest *cdest);
1682 void ip_vs_random_dropentry(struct netns_ipvs *ipvs);
1683 int ip_vs_conn_init(void);
1684 void ip_vs_conn_cleanup(void);
1685
ip_vs_control_del(struct ip_vs_conn * cp)1686 static inline void ip_vs_control_del(struct ip_vs_conn *cp)
1687 {
1688 struct ip_vs_conn *ctl_cp = cp->control;
1689 if (!ctl_cp) {
1690 IP_VS_ERR_BUF("request control DEL for uncontrolled: "
1691 "%s:%d to %s:%d\n",
1692 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1693 ntohs(cp->cport),
1694 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1695 ntohs(cp->vport));
1696
1697 return;
1698 }
1699
1700 IP_VS_DBG_BUF(7, "DELeting control for: "
1701 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1702 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1703 ntohs(cp->cport),
1704 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1705 ntohs(ctl_cp->cport));
1706
1707 cp->control = NULL;
1708 if (atomic_read(&ctl_cp->n_control) == 0) {
1709 IP_VS_ERR_BUF("BUG control DEL with n=0 : "
1710 "%s:%d to %s:%d\n",
1711 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1712 ntohs(cp->cport),
1713 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1714 ntohs(cp->vport));
1715
1716 return;
1717 }
1718 atomic_dec(&ctl_cp->n_control);
1719 }
1720
1721 static inline void
ip_vs_control_add(struct ip_vs_conn * cp,struct ip_vs_conn * ctl_cp)1722 ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp)
1723 {
1724 if (cp->control) {
1725 IP_VS_ERR_BUF("request control ADD for already controlled: "
1726 "%s:%d to %s:%d\n",
1727 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1728 ntohs(cp->cport),
1729 IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1730 ntohs(cp->vport));
1731
1732 ip_vs_control_del(cp);
1733 }
1734
1735 IP_VS_DBG_BUF(7, "ADDing control for: "
1736 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1737 IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1738 ntohs(cp->cport),
1739 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1740 ntohs(ctl_cp->cport));
1741
1742 cp->control = ctl_cp;
1743 atomic_inc(&ctl_cp->n_control);
1744 }
1745
1746 /* Mark our template as assured */
1747 static inline void
ip_vs_control_assure_ct(struct ip_vs_conn * cp)1748 ip_vs_control_assure_ct(struct ip_vs_conn *cp)
1749 {
1750 struct ip_vs_conn *ct = cp->control;
1751
1752 if (ct && !(ct->state & IP_VS_CTPL_S_ASSURED) &&
1753 (ct->flags & IP_VS_CONN_F_TEMPLATE))
1754 ct->state |= IP_VS_CTPL_S_ASSURED;
1755 }
1756
1757 /* IPVS netns init & cleanup functions */
1758 int ip_vs_estimator_net_init(struct netns_ipvs *ipvs);
1759 int ip_vs_control_net_init(struct netns_ipvs *ipvs);
1760 int ip_vs_protocol_net_init(struct netns_ipvs *ipvs);
1761 int ip_vs_app_net_init(struct netns_ipvs *ipvs);
1762 int ip_vs_conn_net_init(struct netns_ipvs *ipvs);
1763 int ip_vs_sync_net_init(struct netns_ipvs *ipvs);
1764 void ip_vs_conn_net_cleanup(struct netns_ipvs *ipvs);
1765 void ip_vs_app_net_cleanup(struct netns_ipvs *ipvs);
1766 void ip_vs_protocol_net_cleanup(struct netns_ipvs *ipvs);
1767 void ip_vs_control_net_cleanup(struct netns_ipvs *ipvs);
1768 void ip_vs_estimator_net_cleanup(struct netns_ipvs *ipvs);
1769 void ip_vs_sync_net_cleanup(struct netns_ipvs *ipvs);
1770 void ip_vs_service_nets_cleanup(struct list_head *net_list);
1771
1772 /* IPVS application functions
1773 * (from ip_vs_app.c)
1774 */
1775 #define IP_VS_APP_MAX_PORTS 8
1776 struct ip_vs_app *register_ip_vs_app(struct netns_ipvs *ipvs, struct ip_vs_app *app);
1777 void unregister_ip_vs_app(struct netns_ipvs *ipvs, struct ip_vs_app *app);
1778 int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1779 void ip_vs_unbind_app(struct ip_vs_conn *cp);
1780 int register_ip_vs_app_inc(struct netns_ipvs *ipvs, struct ip_vs_app *app, __u16 proto,
1781 __u16 port);
1782 int ip_vs_app_inc_get(struct ip_vs_app *inc);
1783 void ip_vs_app_inc_put(struct ip_vs_app *inc);
1784
1785 int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb,
1786 struct ip_vs_iphdr *ipvsh);
1787 int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb,
1788 struct ip_vs_iphdr *ipvsh);
1789
1790 int register_ip_vs_pe(struct ip_vs_pe *pe);
1791 int unregister_ip_vs_pe(struct ip_vs_pe *pe);
1792 struct ip_vs_pe *ip_vs_pe_getbyname(const char *name);
1793 struct ip_vs_pe *__ip_vs_pe_getbyname(const char *pe_name);
1794
1795 /* Use a #define to avoid all of module.h just for these trivial ops */
1796 #define ip_vs_pe_get(pe) \
1797 if (pe && pe->module) \
1798 __module_get(pe->module);
1799
1800 #define ip_vs_pe_put(pe) \
1801 if (pe && pe->module) \
1802 module_put(pe->module);
1803
1804 /* IPVS protocol functions (from ip_vs_proto.c) */
1805 int ip_vs_protocol_init(void);
1806 void ip_vs_protocol_cleanup(void);
1807 void ip_vs_protocol_timeout_change(struct netns_ipvs *ipvs, int flags);
1808 int *ip_vs_create_timeout_table(int *table, int size);
1809 void ip_vs_tcpudp_debug_packet(int af, struct ip_vs_protocol *pp,
1810 const struct sk_buff *skb, int offset,
1811 const char *msg);
1812
1813 extern struct ip_vs_protocol ip_vs_protocol_tcp;
1814 extern struct ip_vs_protocol ip_vs_protocol_udp;
1815 extern struct ip_vs_protocol ip_vs_protocol_icmp;
1816 extern struct ip_vs_protocol ip_vs_protocol_esp;
1817 extern struct ip_vs_protocol ip_vs_protocol_ah;
1818 extern struct ip_vs_protocol ip_vs_protocol_sctp;
1819
1820 /* Registering/unregistering scheduler functions
1821 * (from ip_vs_sched.c)
1822 */
1823 int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1824 int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1825 int ip_vs_bind_scheduler(struct ip_vs_service *svc,
1826 struct ip_vs_scheduler *scheduler);
1827 void ip_vs_unbind_scheduler(struct ip_vs_service *svc,
1828 struct ip_vs_scheduler *sched);
1829 struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name);
1830 void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler);
1831 struct ip_vs_conn *
1832 ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb,
1833 struct ip_vs_proto_data *pd, int *ignored,
1834 struct ip_vs_iphdr *iph);
1835 int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
1836 struct ip_vs_proto_data *pd, struct ip_vs_iphdr *iph);
1837
1838 void ip_vs_scheduler_err(struct ip_vs_service *svc, const char *msg);
1839
1840 /* IPVS control data and functions (from ip_vs_ctl.c) */
1841 extern struct ip_vs_stats ip_vs_stats;
1842 extern int sysctl_ip_vs_sync_ver;
1843
1844 struct ip_vs_service *
1845 ip_vs_service_find(struct netns_ipvs *ipvs, int af, __u32 fwmark, __u16 protocol,
1846 const union nf_inet_addr *vaddr, __be16 vport);
1847
1848 bool ip_vs_has_real_service(struct netns_ipvs *ipvs, int af, __u16 protocol,
1849 const union nf_inet_addr *daddr, __be16 dport);
1850
1851 struct ip_vs_dest *
1852 ip_vs_find_real_service(struct netns_ipvs *ipvs, int af, __u16 protocol,
1853 const union nf_inet_addr *daddr, __be16 dport);
1854 struct ip_vs_dest *ip_vs_find_tunnel(struct netns_ipvs *ipvs, int af,
1855 const union nf_inet_addr *daddr,
1856 __be16 tun_port);
1857
1858 int ip_vs_use_count_inc(void);
1859 void ip_vs_use_count_dec(void);
1860 int ip_vs_register_nl_ioctl(void);
1861 void ip_vs_unregister_nl_ioctl(void);
1862 int ip_vs_control_init(void);
1863 void ip_vs_control_cleanup(void);
1864 struct ip_vs_dest *
1865 ip_vs_find_dest(struct netns_ipvs *ipvs, int svc_af, int dest_af,
1866 const union nf_inet_addr *daddr, __be16 dport,
1867 const union nf_inet_addr *vaddr, __be16 vport,
1868 __u16 protocol, __u32 fwmark, __u32 flags);
1869 void ip_vs_try_bind_dest(struct ip_vs_conn *cp);
1870
ip_vs_dest_hold(struct ip_vs_dest * dest)1871 static inline void ip_vs_dest_hold(struct ip_vs_dest *dest)
1872 {
1873 refcount_inc(&dest->refcnt);
1874 }
1875
ip_vs_dest_put(struct ip_vs_dest * dest)1876 static inline void ip_vs_dest_put(struct ip_vs_dest *dest)
1877 {
1878 smp_mb__before_atomic();
1879 refcount_dec(&dest->refcnt);
1880 }
1881
ip_vs_dest_put_and_free(struct ip_vs_dest * dest)1882 static inline void ip_vs_dest_put_and_free(struct ip_vs_dest *dest)
1883 {
1884 if (refcount_dec_and_test(&dest->refcnt))
1885 kfree(dest);
1886 }
1887
1888 /* IPVS sync daemon data and function prototypes
1889 * (from ip_vs_sync.c)
1890 */
1891 int start_sync_thread(struct netns_ipvs *ipvs, struct ipvs_sync_daemon_cfg *cfg,
1892 int state);
1893 int stop_sync_thread(struct netns_ipvs *ipvs, int state);
1894 void ip_vs_sync_conn(struct netns_ipvs *ipvs, struct ip_vs_conn *cp, int pkts);
1895
1896 /* IPVS rate estimator prototypes (from ip_vs_est.c) */
1897 int ip_vs_start_estimator(struct netns_ipvs *ipvs, struct ip_vs_stats *stats);
1898 void ip_vs_stop_estimator(struct netns_ipvs *ipvs, struct ip_vs_stats *stats);
1899 void ip_vs_zero_estimator(struct ip_vs_stats *stats);
1900 void ip_vs_read_estimator(struct ip_vs_kstats *dst, struct ip_vs_stats *stats);
1901 void ip_vs_est_reload_start(struct netns_ipvs *ipvs, bool restart);
1902 int ip_vs_est_kthread_start(struct netns_ipvs *ipvs,
1903 struct ip_vs_est_kt_data *kd);
1904 void ip_vs_est_kthread_stop(struct ip_vs_est_kt_data *kd);
1905
ip_vs_stop_estimator_tot_stats(struct netns_ipvs * ipvs)1906 static inline void ip_vs_stop_estimator_tot_stats(struct netns_ipvs *ipvs)
1907 {
1908 #ifdef CONFIG_SYSCTL
1909 ip_vs_stop_estimator(ipvs, &ipvs->tot_stats->s);
1910 ipvs->tot_stats->s.est.ktid = -2;
1911 #endif
1912 }
1913
ip_vs_est_stopped_recalc(struct netns_ipvs * ipvs)1914 static inline void ip_vs_est_stopped_recalc(struct netns_ipvs *ipvs)
1915 {
1916 #ifdef CONFIG_SYSCTL
1917 /* Stop tasks while cpulist is empty or if disabled with flag */
1918 ipvs->est_stopped = !sysctl_run_estimation(ipvs) ||
1919 (ipvs->est_cpulist_valid &&
1920 sysctl_est_cpulist_empty(ipvs));
1921 #endif
1922 }
1923
ip_vs_est_stopped(struct netns_ipvs * ipvs)1924 static inline bool ip_vs_est_stopped(struct netns_ipvs *ipvs)
1925 {
1926 #ifdef CONFIG_SYSCTL
1927 return ipvs->est_stopped;
1928 #else
1929 return false;
1930 #endif
1931 }
1932
ip_vs_est_max_threads(struct netns_ipvs * ipvs)1933 static inline int ip_vs_est_max_threads(struct netns_ipvs *ipvs)
1934 {
1935 unsigned int limit = IPVS_EST_CPU_KTHREADS *
1936 sysctl_est_cpulist_weight(ipvs);
1937
1938 return max(1U, limit);
1939 }
1940
1941 /* Various IPVS packet transmitters (from ip_vs_xmit.c) */
1942 int ip_vs_null_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1943 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1944 int ip_vs_bypass_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1945 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1946 int ip_vs_nat_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1947 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1948 int ip_vs_tunnel_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1949 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1950 int ip_vs_dr_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1951 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1952 int ip_vs_icmp_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1953 struct ip_vs_protocol *pp, int offset,
1954 unsigned int hooknum, struct ip_vs_iphdr *iph);
1955 void ip_vs_dest_dst_rcu_free(struct rcu_head *head);
1956
1957 #ifdef CONFIG_IP_VS_IPV6
1958 int ip_vs_bypass_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1959 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1960 int ip_vs_nat_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1961 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1962 int ip_vs_tunnel_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1963 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1964 int ip_vs_dr_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1965 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1966 int ip_vs_icmp_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1967 struct ip_vs_protocol *pp, int offset,
1968 unsigned int hooknum, struct ip_vs_iphdr *iph);
1969 #endif
1970
1971 #ifdef CONFIG_SYSCTL
1972 /* This is a simple mechanism to ignore packets when
1973 * we are loaded. Just set ip_vs_drop_rate to 'n' and
1974 * we start to drop 1/rate of the packets
1975 */
ip_vs_todrop(struct netns_ipvs * ipvs)1976 static inline int ip_vs_todrop(struct netns_ipvs *ipvs)
1977 {
1978 if (!ipvs->drop_rate)
1979 return 0;
1980 if (--ipvs->drop_counter > 0)
1981 return 0;
1982 ipvs->drop_counter = ipvs->drop_rate;
1983 return 1;
1984 }
1985 #else
ip_vs_todrop(struct netns_ipvs * ipvs)1986 static inline int ip_vs_todrop(struct netns_ipvs *ipvs) { return 0; }
1987 #endif
1988
1989 #ifdef CONFIG_SYSCTL
1990 /* Enqueue delayed work for expiring no dest connections
1991 * Only run when sysctl_expire_nodest=1
1992 */
ip_vs_enqueue_expire_nodest_conns(struct netns_ipvs * ipvs)1993 static inline void ip_vs_enqueue_expire_nodest_conns(struct netns_ipvs *ipvs)
1994 {
1995 if (sysctl_expire_nodest_conn(ipvs))
1996 queue_delayed_work(system_long_wq,
1997 &ipvs->expire_nodest_conn_work, 1);
1998 }
1999
2000 void ip_vs_expire_nodest_conn_flush(struct netns_ipvs *ipvs);
2001 #else
ip_vs_enqueue_expire_nodest_conns(struct netns_ipvs * ipvs)2002 static inline void ip_vs_enqueue_expire_nodest_conns(struct netns_ipvs *ipvs) {}
2003 #endif
2004
2005 #define IP_VS_DFWD_METHOD(dest) (atomic_read(&(dest)->conn_flags) & \
2006 IP_VS_CONN_F_FWD_MASK)
2007
2008 /* ip_vs_fwd_tag returns the forwarding tag of the connection */
2009 #define IP_VS_FWD_METHOD(cp) (cp->flags & IP_VS_CONN_F_FWD_MASK)
2010
ip_vs_fwd_tag(struct ip_vs_conn * cp)2011 static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp)
2012 {
2013 char fwd;
2014
2015 switch (IP_VS_FWD_METHOD(cp)) {
2016 case IP_VS_CONN_F_MASQ:
2017 fwd = 'M'; break;
2018 case IP_VS_CONN_F_LOCALNODE:
2019 fwd = 'L'; break;
2020 case IP_VS_CONN_F_TUNNEL:
2021 fwd = 'T'; break;
2022 case IP_VS_CONN_F_DROUTE:
2023 fwd = 'R'; break;
2024 case IP_VS_CONN_F_BYPASS:
2025 fwd = 'B'; break;
2026 default:
2027 fwd = '?'; break;
2028 }
2029 return fwd;
2030 }
2031
2032 /* Check if connection uses double hashing */
ip_vs_conn_use_hash2(struct ip_vs_conn * cp)2033 static inline bool ip_vs_conn_use_hash2(struct ip_vs_conn *cp)
2034 {
2035 return IP_VS_FWD_METHOD(cp) == IP_VS_CONN_F_MASQ &&
2036 !(cp->flags & IP_VS_CONN_F_TEMPLATE);
2037 }
2038
2039 void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp,
2040 struct ip_vs_conn *cp, int dir);
2041
2042 #ifdef CONFIG_IP_VS_IPV6
2043 void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp,
2044 struct ip_vs_conn *cp, int dir);
2045 #endif
2046
2047 __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset);
2048
ip_vs_check_diff4(__be32 old,__be32 new,__wsum oldsum)2049 static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum)
2050 {
2051 __be32 diff[2] = { ~old, new };
2052
2053 return csum_partial(diff, sizeof(diff), oldsum);
2054 }
2055
2056 #ifdef CONFIG_IP_VS_IPV6
ip_vs_check_diff16(const __be32 * old,const __be32 * new,__wsum oldsum)2057 static inline __wsum ip_vs_check_diff16(const __be32 *old, const __be32 *new,
2058 __wsum oldsum)
2059 {
2060 __be32 diff[8] = { ~old[3], ~old[2], ~old[1], ~old[0],
2061 new[3], new[2], new[1], new[0] };
2062
2063 return csum_partial(diff, sizeof(diff), oldsum);
2064 }
2065 #endif
2066
ip_vs_check_diff2(__be16 old,__be16 new,__wsum oldsum)2067 static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum)
2068 {
2069 __be16 diff[2] = { ~old, new };
2070
2071 return csum_partial(diff, sizeof(diff), oldsum);
2072 }
2073
2074 /* Forget current conntrack (unconfirmed) and attach notrack entry */
ip_vs_notrack(struct sk_buff * skb)2075 static inline void ip_vs_notrack(struct sk_buff *skb)
2076 {
2077 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
2078 enum ip_conntrack_info ctinfo;
2079 struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
2080
2081 if (ct) {
2082 nf_conntrack_put(&ct->ct_general);
2083 nf_ct_set(skb, NULL, IP_CT_UNTRACKED);
2084 }
2085 #endif
2086 }
2087
2088 #ifdef CONFIG_IP_VS_NFCT
2089 /* Netfilter connection tracking
2090 * (from ip_vs_nfct.c)
2091 */
ip_vs_conntrack_enabled(struct netns_ipvs * ipvs)2092 static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
2093 {
2094 #ifdef CONFIG_SYSCTL
2095 return ipvs->sysctl_conntrack;
2096 #else
2097 return 0;
2098 #endif
2099 }
2100
2101 void ip_vs_update_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp,
2102 int outin);
2103 int ip_vs_confirm_conntrack(struct sk_buff *skb);
2104 void ip_vs_nfct_expect_related(struct sk_buff *skb, struct nf_conn *ct,
2105 struct ip_vs_conn *cp, u_int8_t proto,
2106 const __be16 port, int from_rs);
2107 void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp);
2108
2109 #else
2110
ip_vs_conntrack_enabled(struct netns_ipvs * ipvs)2111 static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
2112 {
2113 return 0;
2114 }
2115
ip_vs_update_conntrack(struct sk_buff * skb,struct ip_vs_conn * cp,int outin)2116 static inline void ip_vs_update_conntrack(struct sk_buff *skb,
2117 struct ip_vs_conn *cp, int outin)
2118 {
2119 }
2120
ip_vs_confirm_conntrack(struct sk_buff * skb)2121 static inline int ip_vs_confirm_conntrack(struct sk_buff *skb)
2122 {
2123 return NF_ACCEPT;
2124 }
2125
ip_vs_conn_drop_conntrack(struct ip_vs_conn * cp)2126 static inline void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp)
2127 {
2128 }
2129 #endif /* CONFIG_IP_VS_NFCT */
2130
2131 /* Using old conntrack that can not be redirected to another real server? */
ip_vs_conn_uses_old_conntrack(struct ip_vs_conn * cp,struct sk_buff * skb)2132 static inline bool ip_vs_conn_uses_old_conntrack(struct ip_vs_conn *cp,
2133 struct sk_buff *skb)
2134 {
2135 #ifdef CONFIG_IP_VS_NFCT
2136 enum ip_conntrack_info ctinfo;
2137 struct nf_conn *ct;
2138
2139 ct = nf_ct_get(skb, &ctinfo);
2140 if (ct && nf_ct_is_confirmed(ct))
2141 return true;
2142 #endif
2143 return false;
2144 }
2145
ip_vs_register_conntrack(struct ip_vs_service * svc)2146 static inline int ip_vs_register_conntrack(struct ip_vs_service *svc)
2147 {
2148 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
2149 int afmask = (svc->af == AF_INET6) ? 2 : 1;
2150 int ret = 0;
2151
2152 if (!(svc->conntrack_afmask & afmask)) {
2153 ret = nf_ct_netns_get(svc->ipvs->net, svc->af);
2154 if (ret >= 0)
2155 svc->conntrack_afmask |= afmask;
2156 }
2157 return ret;
2158 #else
2159 return 0;
2160 #endif
2161 }
2162
ip_vs_unregister_conntrack(struct ip_vs_service * svc)2163 static inline void ip_vs_unregister_conntrack(struct ip_vs_service *svc)
2164 {
2165 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
2166 int afmask = (svc->af == AF_INET6) ? 2 : 1;
2167
2168 if (svc->conntrack_afmask & afmask) {
2169 nf_ct_netns_put(svc->ipvs->net, svc->af);
2170 svc->conntrack_afmask &= ~afmask;
2171 }
2172 #endif
2173 }
2174
2175 int ip_vs_register_hooks(struct netns_ipvs *ipvs, unsigned int af);
2176 void ip_vs_unregister_hooks(struct netns_ipvs *ipvs, unsigned int af);
2177
2178 static inline int
ip_vs_dest_conn_overhead(struct ip_vs_dest * dest)2179 ip_vs_dest_conn_overhead(struct ip_vs_dest *dest)
2180 {
2181 /* We think the overhead of processing active connections is 256
2182 * times higher than that of inactive connections in average. (This
2183 * 256 times might not be accurate, we will change it later) We
2184 * use the following formula to estimate the overhead now:
2185 * dest->activeconns*256 + dest->inactconns
2186 */
2187 return (atomic_read(&dest->activeconns) << 8) +
2188 atomic_read(&dest->inactconns);
2189 }
2190
2191 #ifdef CONFIG_IP_VS_PROTO_TCP
2192 INDIRECT_CALLABLE_DECLARE(int
2193 tcp_snat_handler(struct sk_buff *skb, struct ip_vs_protocol *pp,
2194 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph));
2195 #endif
2196
2197 #ifdef CONFIG_IP_VS_PROTO_UDP
2198 INDIRECT_CALLABLE_DECLARE(int
2199 udp_snat_handler(struct sk_buff *skb, struct ip_vs_protocol *pp,
2200 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph));
2201 #endif
2202 #endif /* _NET_IP_VS_H */
2203