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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * IP Virtual Server | |
3 | * data structure and functionality definitions | |
4 | */ | |
5 | ||
6 | #ifndef _IP_VS_H | |
7 | #define _IP_VS_H | |
8 | ||
9 | #include <asm/types.h> /* For __uXX types */ | |
da413908 | 10 | #include <linux/types.h> /* For __beXX types in userland */ |
1da177e4 LT |
11 | |
12 | #define IP_VS_VERSION_CODE 0x010201 | |
13 | #define NVERSION(version) \ | |
14 | (version >> 16) & 0xFF, \ | |
15 | (version >> 8) & 0xFF, \ | |
16 | version & 0xFF | |
17 | ||
18 | /* | |
19 | * Virtual Service Flags | |
20 | */ | |
21 | #define IP_VS_SVC_F_PERSISTENT 0x0001 /* persistent port */ | |
22 | #define IP_VS_SVC_F_HASHED 0x0002 /* hashed entry */ | |
23 | ||
24 | /* | |
25 | * Destination Server Flags | |
26 | */ | |
27 | #define IP_VS_DEST_F_AVAILABLE 0x0001 /* server is available */ | |
28 | #define IP_VS_DEST_F_OVERLOAD 0x0002 /* server is overloaded */ | |
29 | ||
30 | /* | |
31 | * IPVS sync daemon states | |
32 | */ | |
33 | #define IP_VS_STATE_NONE 0x0000 /* daemon is stopped */ | |
34 | #define IP_VS_STATE_MASTER 0x0001 /* started as master */ | |
35 | #define IP_VS_STATE_BACKUP 0x0002 /* started as backup */ | |
36 | ||
37 | /* | |
38 | * IPVS socket options | |
39 | */ | |
40 | #define IP_VS_BASE_CTL (64+1024+64) /* base */ | |
41 | ||
42 | #define IP_VS_SO_SET_NONE IP_VS_BASE_CTL /* just peek */ | |
43 | #define IP_VS_SO_SET_INSERT (IP_VS_BASE_CTL+1) | |
44 | #define IP_VS_SO_SET_ADD (IP_VS_BASE_CTL+2) | |
45 | #define IP_VS_SO_SET_EDIT (IP_VS_BASE_CTL+3) | |
46 | #define IP_VS_SO_SET_DEL (IP_VS_BASE_CTL+4) | |
47 | #define IP_VS_SO_SET_FLUSH (IP_VS_BASE_CTL+5) | |
48 | #define IP_VS_SO_SET_LIST (IP_VS_BASE_CTL+6) | |
49 | #define IP_VS_SO_SET_ADDDEST (IP_VS_BASE_CTL+7) | |
50 | #define IP_VS_SO_SET_DELDEST (IP_VS_BASE_CTL+8) | |
51 | #define IP_VS_SO_SET_EDITDEST (IP_VS_BASE_CTL+9) | |
52 | #define IP_VS_SO_SET_TIMEOUT (IP_VS_BASE_CTL+10) | |
53 | #define IP_VS_SO_SET_STARTDAEMON (IP_VS_BASE_CTL+11) | |
54 | #define IP_VS_SO_SET_STOPDAEMON (IP_VS_BASE_CTL+12) | |
55 | #define IP_VS_SO_SET_RESTORE (IP_VS_BASE_CTL+13) | |
56 | #define IP_VS_SO_SET_SAVE (IP_VS_BASE_CTL+14) | |
57 | #define IP_VS_SO_SET_ZERO (IP_VS_BASE_CTL+15) | |
58 | #define IP_VS_SO_SET_MAX IP_VS_SO_SET_ZERO | |
59 | ||
60 | #define IP_VS_SO_GET_VERSION IP_VS_BASE_CTL | |
61 | #define IP_VS_SO_GET_INFO (IP_VS_BASE_CTL+1) | |
62 | #define IP_VS_SO_GET_SERVICES (IP_VS_BASE_CTL+2) | |
63 | #define IP_VS_SO_GET_SERVICE (IP_VS_BASE_CTL+3) | |
64 | #define IP_VS_SO_GET_DESTS (IP_VS_BASE_CTL+4) | |
65 | #define IP_VS_SO_GET_DEST (IP_VS_BASE_CTL+5) /* not used now */ | |
66 | #define IP_VS_SO_GET_TIMEOUT (IP_VS_BASE_CTL+6) | |
67 | #define IP_VS_SO_GET_DAEMON (IP_VS_BASE_CTL+7) | |
68 | #define IP_VS_SO_GET_MAX IP_VS_SO_GET_DAEMON | |
69 | ||
70 | ||
71 | /* | |
72 | * IPVS Connection Flags | |
73 | */ | |
74 | #define IP_VS_CONN_F_FWD_MASK 0x0007 /* mask for the fwd methods */ | |
75 | #define IP_VS_CONN_F_MASQ 0x0000 /* masquerading/NAT */ | |
76 | #define IP_VS_CONN_F_LOCALNODE 0x0001 /* local node */ | |
77 | #define IP_VS_CONN_F_TUNNEL 0x0002 /* tunneling */ | |
78 | #define IP_VS_CONN_F_DROUTE 0x0003 /* direct routing */ | |
79 | #define IP_VS_CONN_F_BYPASS 0x0004 /* cache bypass */ | |
80 | #define IP_VS_CONN_F_SYNC 0x0020 /* entry created by sync */ | |
81 | #define IP_VS_CONN_F_HASHED 0x0040 /* hashed entry */ | |
82 | #define IP_VS_CONN_F_NOOUTPUT 0x0080 /* no output packets */ | |
83 | #define IP_VS_CONN_F_INACTIVE 0x0100 /* not established */ | |
84 | #define IP_VS_CONN_F_OUT_SEQ 0x0200 /* must do output seq adjust */ | |
85 | #define IP_VS_CONN_F_IN_SEQ 0x0400 /* must do input seq adjust */ | |
86 | #define IP_VS_CONN_F_SEQ_MASK 0x0600 /* in/out sequence mask */ | |
87 | #define IP_VS_CONN_F_NO_CPORT 0x0800 /* no client port set yet */ | |
87375ab4 | 88 | #define IP_VS_CONN_F_TEMPLATE 0x1000 /* template, not connection */ |
1da177e4 LT |
89 | |
90 | /* Move it to better place one day, for now keep it unique */ | |
91 | #define NFC_IPVS_PROPERTY 0x10000 | |
92 | ||
93 | #define IP_VS_SCHEDNAME_MAXLEN 16 | |
94 | #define IP_VS_IFNAME_MAXLEN 16 | |
95 | ||
96 | ||
97 | /* | |
98 | * The struct ip_vs_service_user and struct ip_vs_dest_user are | |
99 | * used to set IPVS rules through setsockopt. | |
100 | */ | |
101 | struct ip_vs_service_user { | |
102 | /* virtual service addresses */ | |
103 | u_int16_t protocol; | |
014d730d AV |
104 | __be32 addr; /* virtual ip address */ |
105 | __be16 port; | |
1da177e4 LT |
106 | u_int32_t fwmark; /* firwall mark of service */ |
107 | ||
108 | /* virtual service options */ | |
109 | char sched_name[IP_VS_SCHEDNAME_MAXLEN]; | |
110 | unsigned flags; /* virtual service flags */ | |
111 | unsigned timeout; /* persistent timeout in sec */ | |
014d730d | 112 | __be32 netmask; /* persistent netmask */ |
1da177e4 LT |
113 | }; |
114 | ||
115 | ||
116 | struct ip_vs_dest_user { | |
117 | /* destination server address */ | |
014d730d AV |
118 | __be32 addr; |
119 | __be16 port; | |
1da177e4 LT |
120 | |
121 | /* real server options */ | |
122 | unsigned conn_flags; /* connection flags */ | |
123 | int weight; /* destination weight */ | |
124 | ||
125 | /* thresholds for active connections */ | |
126 | u_int32_t u_threshold; /* upper threshold */ | |
127 | u_int32_t l_threshold; /* lower threshold */ | |
128 | }; | |
129 | ||
130 | ||
131 | /* | |
132 | * IPVS statistics object (for user space) | |
133 | */ | |
134 | struct ip_vs_stats_user | |
135 | { | |
136 | __u32 conns; /* connections scheduled */ | |
137 | __u32 inpkts; /* incoming packets */ | |
138 | __u32 outpkts; /* outgoing packets */ | |
139 | __u64 inbytes; /* incoming bytes */ | |
140 | __u64 outbytes; /* outgoing bytes */ | |
141 | ||
142 | __u32 cps; /* current connection rate */ | |
143 | __u32 inpps; /* current in packet rate */ | |
144 | __u32 outpps; /* current out packet rate */ | |
145 | __u32 inbps; /* current in byte rate */ | |
146 | __u32 outbps; /* current out byte rate */ | |
147 | }; | |
148 | ||
149 | ||
150 | /* The argument to IP_VS_SO_GET_INFO */ | |
151 | struct ip_vs_getinfo { | |
152 | /* version number */ | |
153 | unsigned int version; | |
154 | ||
155 | /* size of connection hash table */ | |
156 | unsigned int size; | |
157 | ||
158 | /* number of virtual services */ | |
159 | unsigned int num_services; | |
160 | }; | |
161 | ||
162 | ||
163 | /* The argument to IP_VS_SO_GET_SERVICE */ | |
164 | struct ip_vs_service_entry { | |
165 | /* which service: user fills in these */ | |
166 | u_int16_t protocol; | |
014d730d AV |
167 | __be32 addr; /* virtual address */ |
168 | __be16 port; | |
1da177e4 LT |
169 | u_int32_t fwmark; /* firwall mark of service */ |
170 | ||
171 | /* service options */ | |
172 | char sched_name[IP_VS_SCHEDNAME_MAXLEN]; | |
173 | unsigned flags; /* virtual service flags */ | |
174 | unsigned timeout; /* persistent timeout */ | |
014d730d | 175 | __be32 netmask; /* persistent netmask */ |
1da177e4 LT |
176 | |
177 | /* number of real servers */ | |
178 | unsigned int num_dests; | |
179 | ||
180 | /* statistics */ | |
181 | struct ip_vs_stats_user stats; | |
182 | }; | |
183 | ||
184 | ||
185 | struct ip_vs_dest_entry { | |
014d730d AV |
186 | __be32 addr; /* destination address */ |
187 | __be16 port; | |
1da177e4 LT |
188 | unsigned conn_flags; /* connection flags */ |
189 | int weight; /* destination weight */ | |
190 | ||
191 | u_int32_t u_threshold; /* upper threshold */ | |
192 | u_int32_t l_threshold; /* lower threshold */ | |
193 | ||
194 | u_int32_t activeconns; /* active connections */ | |
195 | u_int32_t inactconns; /* inactive connections */ | |
196 | u_int32_t persistconns; /* persistent connections */ | |
197 | ||
198 | /* statistics */ | |
199 | struct ip_vs_stats_user stats; | |
200 | }; | |
201 | ||
202 | ||
203 | /* The argument to IP_VS_SO_GET_DESTS */ | |
204 | struct ip_vs_get_dests { | |
205 | /* which service: user fills in these */ | |
206 | u_int16_t protocol; | |
014d730d AV |
207 | __be32 addr; /* virtual address */ |
208 | __be16 port; | |
1da177e4 LT |
209 | u_int32_t fwmark; /* firwall mark of service */ |
210 | ||
211 | /* number of real servers */ | |
212 | unsigned int num_dests; | |
213 | ||
214 | /* the real servers */ | |
215 | struct ip_vs_dest_entry entrytable[0]; | |
216 | }; | |
217 | ||
218 | ||
219 | /* The argument to IP_VS_SO_GET_SERVICES */ | |
220 | struct ip_vs_get_services { | |
221 | /* number of virtual services */ | |
222 | unsigned int num_services; | |
223 | ||
224 | /* service table */ | |
225 | struct ip_vs_service_entry entrytable[0]; | |
226 | }; | |
227 | ||
228 | ||
229 | /* The argument to IP_VS_SO_GET_TIMEOUT */ | |
230 | struct ip_vs_timeout_user { | |
231 | int tcp_timeout; | |
232 | int tcp_fin_timeout; | |
233 | int udp_timeout; | |
234 | }; | |
235 | ||
236 | ||
237 | /* The argument to IP_VS_SO_GET_DAEMON */ | |
238 | struct ip_vs_daemon_user { | |
239 | /* sync daemon state (master/backup) */ | |
240 | int state; | |
241 | ||
242 | /* multicast interface name */ | |
243 | char mcast_ifn[IP_VS_IFNAME_MAXLEN]; | |
244 | ||
245 | /* SyncID we belong to */ | |
246 | int syncid; | |
247 | }; | |
248 | ||
249 | ||
250 | #ifdef __KERNEL__ | |
251 | ||
1da177e4 LT |
252 | #include <linux/list.h> /* for struct list_head */ |
253 | #include <linux/spinlock.h> /* for struct rwlock_t */ | |
1da177e4 | 254 | #include <asm/atomic.h> /* for struct atomic_t */ |
1da177e4 | 255 | #include <linux/compiler.h> |
14c85021 | 256 | #include <linux/timer.h> |
1da177e4 | 257 | |
14c85021 | 258 | #include <net/checksum.h> |
1da177e4 LT |
259 | |
260 | #ifdef CONFIG_IP_VS_DEBUG | |
14c85021 ACM |
261 | #include <linux/net.h> |
262 | ||
1da177e4 LT |
263 | extern int ip_vs_get_debug_level(void); |
264 | #define IP_VS_DBG(level, msg...) \ | |
265 | do { \ | |
266 | if (level <= ip_vs_get_debug_level()) \ | |
267 | printk(KERN_DEBUG "IPVS: " msg); \ | |
268 | } while (0) | |
269 | #define IP_VS_DBG_RL(msg...) \ | |
270 | do { \ | |
271 | if (net_ratelimit()) \ | |
272 | printk(KERN_DEBUG "IPVS: " msg); \ | |
273 | } while (0) | |
274 | #define IP_VS_DBG_PKT(level, pp, skb, ofs, msg) \ | |
275 | do { \ | |
276 | if (level <= ip_vs_get_debug_level()) \ | |
277 | pp->debug_packet(pp, skb, ofs, msg); \ | |
278 | } while (0) | |
279 | #define IP_VS_DBG_RL_PKT(level, pp, skb, ofs, msg) \ | |
280 | do { \ | |
281 | if (level <= ip_vs_get_debug_level() && \ | |
282 | net_ratelimit()) \ | |
283 | pp->debug_packet(pp, skb, ofs, msg); \ | |
284 | } while (0) | |
285 | #else /* NO DEBUGGING at ALL */ | |
286 | #define IP_VS_DBG(level, msg...) do {} while (0) | |
287 | #define IP_VS_DBG_RL(msg...) do {} while (0) | |
288 | #define IP_VS_DBG_PKT(level, pp, skb, ofs, msg) do {} while (0) | |
289 | #define IP_VS_DBG_RL_PKT(level, pp, skb, ofs, msg) do {} while (0) | |
290 | #endif | |
291 | ||
292 | #define IP_VS_BUG() BUG() | |
293 | #define IP_VS_ERR(msg...) printk(KERN_ERR "IPVS: " msg) | |
294 | #define IP_VS_INFO(msg...) printk(KERN_INFO "IPVS: " msg) | |
295 | #define IP_VS_WARNING(msg...) \ | |
296 | printk(KERN_WARNING "IPVS: " msg) | |
297 | #define IP_VS_ERR_RL(msg...) \ | |
298 | do { \ | |
299 | if (net_ratelimit()) \ | |
300 | printk(KERN_ERR "IPVS: " msg); \ | |
301 | } while (0) | |
302 | ||
303 | #ifdef CONFIG_IP_VS_DEBUG | |
304 | #define EnterFunction(level) \ | |
305 | do { \ | |
306 | if (level <= ip_vs_get_debug_level()) \ | |
307 | printk(KERN_DEBUG "Enter: %s, %s line %i\n", \ | |
308 | __FUNCTION__, __FILE__, __LINE__); \ | |
309 | } while (0) | |
310 | #define LeaveFunction(level) \ | |
311 | do { \ | |
312 | if (level <= ip_vs_get_debug_level()) \ | |
313 | printk(KERN_DEBUG "Leave: %s, %s line %i\n", \ | |
314 | __FUNCTION__, __FILE__, __LINE__); \ | |
315 | } while (0) | |
316 | #else | |
317 | #define EnterFunction(level) do {} while (0) | |
318 | #define LeaveFunction(level) do {} while (0) | |
319 | #endif | |
320 | ||
321 | #define IP_VS_WAIT_WHILE(expr) while (expr) { cpu_relax(); } | |
322 | ||
323 | ||
324 | /* | |
325 | * The port number of FTP service (in network order). | |
326 | */ | |
327 | #define FTPPORT __constant_htons(21) | |
328 | #define FTPDATA __constant_htons(20) | |
329 | ||
330 | /* | |
331 | * IPVS sysctl variables under the /proc/sys/net/ipv4/vs/ | |
332 | */ | |
333 | #define NET_IPV4_VS 21 | |
334 | ||
335 | enum { | |
336 | NET_IPV4_VS_DEBUG_LEVEL=1, | |
337 | NET_IPV4_VS_AMEMTHRESH=2, | |
338 | NET_IPV4_VS_AMDROPRATE=3, | |
339 | NET_IPV4_VS_DROP_ENTRY=4, | |
340 | NET_IPV4_VS_DROP_PACKET=5, | |
341 | NET_IPV4_VS_SECURE_TCP=6, | |
342 | NET_IPV4_VS_TO_ES=7, | |
343 | NET_IPV4_VS_TO_SS=8, | |
344 | NET_IPV4_VS_TO_SR=9, | |
345 | NET_IPV4_VS_TO_FW=10, | |
346 | NET_IPV4_VS_TO_TW=11, | |
347 | NET_IPV4_VS_TO_CL=12, | |
348 | NET_IPV4_VS_TO_CW=13, | |
349 | NET_IPV4_VS_TO_LA=14, | |
350 | NET_IPV4_VS_TO_LI=15, | |
351 | NET_IPV4_VS_TO_SA=16, | |
352 | NET_IPV4_VS_TO_UDP=17, | |
353 | NET_IPV4_VS_TO_ICMP=18, | |
354 | NET_IPV4_VS_LBLC_EXPIRE=19, | |
355 | NET_IPV4_VS_LBLCR_EXPIRE=20, | |
356 | NET_IPV4_VS_CACHE_BYPASS=22, | |
357 | NET_IPV4_VS_EXPIRE_NODEST_CONN=23, | |
358 | NET_IPV4_VS_SYNC_THRESHOLD=24, | |
359 | NET_IPV4_VS_NAT_ICMP_SEND=25, | |
360 | NET_IPV4_VS_EXPIRE_QUIESCENT_TEMPLATE=26, | |
361 | NET_IPV4_VS_LAST | |
362 | }; | |
363 | ||
364 | /* | |
365 | * TCP State Values | |
366 | */ | |
367 | enum { | |
368 | IP_VS_TCP_S_NONE = 0, | |
369 | IP_VS_TCP_S_ESTABLISHED, | |
370 | IP_VS_TCP_S_SYN_SENT, | |
371 | IP_VS_TCP_S_SYN_RECV, | |
372 | IP_VS_TCP_S_FIN_WAIT, | |
373 | IP_VS_TCP_S_TIME_WAIT, | |
374 | IP_VS_TCP_S_CLOSE, | |
375 | IP_VS_TCP_S_CLOSE_WAIT, | |
376 | IP_VS_TCP_S_LAST_ACK, | |
377 | IP_VS_TCP_S_LISTEN, | |
378 | IP_VS_TCP_S_SYNACK, | |
379 | IP_VS_TCP_S_LAST | |
380 | }; | |
381 | ||
382 | /* | |
383 | * UDP State Values | |
384 | */ | |
385 | enum { | |
386 | IP_VS_UDP_S_NORMAL, | |
387 | IP_VS_UDP_S_LAST, | |
388 | }; | |
389 | ||
390 | /* | |
391 | * ICMP State Values | |
392 | */ | |
393 | enum { | |
394 | IP_VS_ICMP_S_NORMAL, | |
395 | IP_VS_ICMP_S_LAST, | |
396 | }; | |
397 | ||
398 | /* | |
399 | * Delta sequence info structure | |
400 | * Each ip_vs_conn has 2 (output AND input seq. changes). | |
401 | * Only used in the VS/NAT. | |
402 | */ | |
403 | struct ip_vs_seq { | |
404 | __u32 init_seq; /* Add delta from this seq */ | |
405 | __u32 delta; /* Delta in sequence numbers */ | |
406 | __u32 previous_delta; /* Delta in sequence numbers | |
407 | before last resized pkt */ | |
408 | }; | |
409 | ||
410 | ||
411 | /* | |
412 | * IPVS statistics object | |
413 | */ | |
414 | struct ip_vs_stats | |
415 | { | |
416 | __u32 conns; /* connections scheduled */ | |
417 | __u32 inpkts; /* incoming packets */ | |
418 | __u32 outpkts; /* outgoing packets */ | |
419 | __u64 inbytes; /* incoming bytes */ | |
420 | __u64 outbytes; /* outgoing bytes */ | |
421 | ||
422 | __u32 cps; /* current connection rate */ | |
423 | __u32 inpps; /* current in packet rate */ | |
424 | __u32 outpps; /* current out packet rate */ | |
425 | __u32 inbps; /* current in byte rate */ | |
426 | __u32 outbps; /* current out byte rate */ | |
427 | ||
428 | spinlock_t lock; /* spin lock */ | |
429 | }; | |
430 | ||
14c85021 ACM |
431 | struct dst_entry; |
432 | struct iphdr; | |
1da177e4 LT |
433 | struct ip_vs_conn; |
434 | struct ip_vs_app; | |
14c85021 | 435 | struct sk_buff; |
1da177e4 LT |
436 | |
437 | struct ip_vs_protocol { | |
438 | struct ip_vs_protocol *next; | |
439 | char *name; | |
440 | __u16 protocol; | |
441 | int dont_defrag; | |
442 | atomic_t appcnt; /* counter of proto app incs */ | |
443 | int *timeout_table; /* protocol timeout table */ | |
444 | ||
445 | void (*init)(struct ip_vs_protocol *pp); | |
446 | ||
447 | void (*exit)(struct ip_vs_protocol *pp); | |
448 | ||
449 | int (*conn_schedule)(struct sk_buff *skb, | |
450 | struct ip_vs_protocol *pp, | |
451 | int *verdict, struct ip_vs_conn **cpp); | |
452 | ||
453 | struct ip_vs_conn * | |
454 | (*conn_in_get)(const struct sk_buff *skb, | |
455 | struct ip_vs_protocol *pp, | |
456 | const struct iphdr *iph, | |
457 | unsigned int proto_off, | |
458 | int inverse); | |
459 | ||
460 | struct ip_vs_conn * | |
461 | (*conn_out_get)(const struct sk_buff *skb, | |
462 | struct ip_vs_protocol *pp, | |
463 | const struct iphdr *iph, | |
464 | unsigned int proto_off, | |
465 | int inverse); | |
466 | ||
3db05fea | 467 | int (*snat_handler)(struct sk_buff *skb, |
1da177e4 LT |
468 | struct ip_vs_protocol *pp, struct ip_vs_conn *cp); |
469 | ||
3db05fea | 470 | int (*dnat_handler)(struct sk_buff *skb, |
1da177e4 LT |
471 | struct ip_vs_protocol *pp, struct ip_vs_conn *cp); |
472 | ||
473 | int (*csum_check)(struct sk_buff *skb, struct ip_vs_protocol *pp); | |
474 | ||
475 | const char *(*state_name)(int state); | |
476 | ||
477 | int (*state_transition)(struct ip_vs_conn *cp, int direction, | |
478 | const struct sk_buff *skb, | |
479 | struct ip_vs_protocol *pp); | |
480 | ||
481 | int (*register_app)(struct ip_vs_app *inc); | |
482 | ||
483 | void (*unregister_app)(struct ip_vs_app *inc); | |
484 | ||
485 | int (*app_conn_bind)(struct ip_vs_conn *cp); | |
486 | ||
487 | void (*debug_packet)(struct ip_vs_protocol *pp, | |
488 | const struct sk_buff *skb, | |
489 | int offset, | |
490 | const char *msg); | |
491 | ||
492 | void (*timeout_change)(struct ip_vs_protocol *pp, int flags); | |
493 | ||
494 | int (*set_state_timeout)(struct ip_vs_protocol *pp, char *sname, int to); | |
495 | }; | |
496 | ||
497 | extern struct ip_vs_protocol * ip_vs_proto_get(unsigned short proto); | |
498 | ||
499 | /* | |
500 | * IP_VS structure allocated for each dynamically scheduled connection | |
501 | */ | |
502 | struct ip_vs_conn { | |
503 | struct list_head c_list; /* hashed list heads */ | |
504 | ||
505 | /* Protocol, addresses and port numbers */ | |
014d730d AV |
506 | __be32 caddr; /* client address */ |
507 | __be32 vaddr; /* virtual address */ | |
508 | __be32 daddr; /* destination address */ | |
509 | __be16 cport; | |
510 | __be16 vport; | |
511 | __be16 dport; | |
1da177e4 LT |
512 | __u16 protocol; /* Which protocol (TCP/UDP) */ |
513 | ||
514 | /* counter and timer */ | |
515 | atomic_t refcnt; /* reference count */ | |
516 | struct timer_list timer; /* Expiration timer */ | |
517 | volatile unsigned long timeout; /* timeout */ | |
518 | ||
519 | /* Flags and state transition */ | |
520 | spinlock_t lock; /* lock for state transition */ | |
521 | volatile __u16 flags; /* status flags */ | |
522 | volatile __u16 state; /* state info */ | |
efac5276 RB |
523 | volatile __u16 old_state; /* old state, to be used for |
524 | * state transition triggerd | |
525 | * synchronization | |
526 | */ | |
1da177e4 LT |
527 | |
528 | /* Control members */ | |
529 | struct ip_vs_conn *control; /* Master control connection */ | |
530 | atomic_t n_control; /* Number of controlled ones */ | |
531 | struct ip_vs_dest *dest; /* real server */ | |
532 | atomic_t in_pkts; /* incoming packet counter */ | |
533 | ||
534 | /* packet transmitter for different forwarding methods. If it | |
535 | mangles the packet, it must return NF_DROP or better NF_STOLEN, | |
536 | otherwise this must be changed to a sk_buff **. | |
537 | */ | |
538 | int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp, | |
539 | struct ip_vs_protocol *pp); | |
540 | ||
541 | /* Note: we can group the following members into a structure, | |
542 | in order to save more space, and the following members are | |
543 | only used in VS/NAT anyway */ | |
544 | struct ip_vs_app *app; /* bound ip_vs_app object */ | |
545 | void *app_data; /* Application private data */ | |
546 | struct ip_vs_seq in_seq; /* incoming seq. struct */ | |
547 | struct ip_vs_seq out_seq; /* outgoing seq. struct */ | |
548 | }; | |
549 | ||
550 | ||
551 | /* | |
552 | * The information about the virtual service offered to the net | |
553 | * and the forwarding entries | |
554 | */ | |
555 | struct ip_vs_service { | |
556 | struct list_head s_list; /* for normal service table */ | |
557 | struct list_head f_list; /* for fwmark-based service table */ | |
558 | atomic_t refcnt; /* reference counter */ | |
559 | atomic_t usecnt; /* use counter */ | |
560 | ||
561 | __u16 protocol; /* which protocol (TCP/UDP) */ | |
014d730d AV |
562 | __be32 addr; /* IP address for virtual service */ |
563 | __be16 port; /* port number for the service */ | |
1da177e4 LT |
564 | __u32 fwmark; /* firewall mark of the service */ |
565 | unsigned flags; /* service status flags */ | |
566 | unsigned timeout; /* persistent timeout in ticks */ | |
014d730d | 567 | __be32 netmask; /* grouping granularity */ |
1da177e4 LT |
568 | |
569 | struct list_head destinations; /* real server d-linked list */ | |
570 | __u32 num_dests; /* number of servers */ | |
571 | struct ip_vs_stats stats; /* statistics for the service */ | |
572 | struct ip_vs_app *inc; /* bind conns to this app inc */ | |
573 | ||
574 | /* for scheduling */ | |
575 | struct ip_vs_scheduler *scheduler; /* bound scheduler object */ | |
576 | rwlock_t sched_lock; /* lock sched_data */ | |
577 | void *sched_data; /* scheduler application data */ | |
578 | }; | |
579 | ||
580 | ||
581 | /* | |
582 | * The real server destination forwarding entry | |
583 | * with ip address, port number, and so on. | |
584 | */ | |
585 | struct ip_vs_dest { | |
586 | struct list_head n_list; /* for the dests in the service */ | |
587 | struct list_head d_list; /* for table with all the dests */ | |
588 | ||
014d730d AV |
589 | __be32 addr; /* IP address of the server */ |
590 | __be16 port; /* port number of the server */ | |
1da177e4 LT |
591 | volatile unsigned flags; /* dest status flags */ |
592 | atomic_t conn_flags; /* flags to copy to conn */ | |
593 | atomic_t weight; /* server weight */ | |
594 | ||
595 | atomic_t refcnt; /* reference counter */ | |
596 | struct ip_vs_stats stats; /* statistics */ | |
597 | ||
598 | /* connection counters and thresholds */ | |
599 | atomic_t activeconns; /* active connections */ | |
600 | atomic_t inactconns; /* inactive connections */ | |
601 | atomic_t persistconns; /* persistent connections */ | |
602 | __u32 u_threshold; /* upper threshold */ | |
603 | __u32 l_threshold; /* lower threshold */ | |
604 | ||
605 | /* for destination cache */ | |
606 | spinlock_t dst_lock; /* lock of dst_cache */ | |
607 | struct dst_entry *dst_cache; /* destination cache entry */ | |
608 | u32 dst_rtos; /* RT_TOS(tos) for dst */ | |
609 | ||
610 | /* for virtual service */ | |
611 | struct ip_vs_service *svc; /* service it belongs to */ | |
612 | __u16 protocol; /* which protocol (TCP/UDP) */ | |
014d730d AV |
613 | __be32 vaddr; /* virtual IP address */ |
614 | __be16 vport; /* virtual port number */ | |
1da177e4 LT |
615 | __u32 vfwmark; /* firewall mark of service */ |
616 | }; | |
617 | ||
618 | ||
619 | /* | |
620 | * The scheduler object | |
621 | */ | |
622 | struct ip_vs_scheduler { | |
623 | struct list_head n_list; /* d-linked list head */ | |
624 | char *name; /* scheduler name */ | |
625 | atomic_t refcnt; /* reference counter */ | |
626 | struct module *module; /* THIS_MODULE/NULL */ | |
627 | ||
628 | /* scheduler initializing service */ | |
629 | int (*init_service)(struct ip_vs_service *svc); | |
630 | /* scheduling service finish */ | |
631 | int (*done_service)(struct ip_vs_service *svc); | |
632 | /* scheduler updating service */ | |
633 | int (*update_service)(struct ip_vs_service *svc); | |
634 | ||
635 | /* selecting a server from the given service */ | |
636 | struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc, | |
637 | const struct sk_buff *skb); | |
638 | }; | |
639 | ||
640 | ||
641 | /* | |
642 | * The application module object (a.k.a. app incarnation) | |
643 | */ | |
644 | struct ip_vs_app | |
645 | { | |
646 | struct list_head a_list; /* member in app list */ | |
647 | int type; /* IP_VS_APP_TYPE_xxx */ | |
648 | char *name; /* application module name */ | |
649 | __u16 protocol; | |
650 | struct module *module; /* THIS_MODULE/NULL */ | |
651 | struct list_head incs_list; /* list of incarnations */ | |
652 | ||
653 | /* members for application incarnations */ | |
654 | struct list_head p_list; /* member in proto app list */ | |
655 | struct ip_vs_app *app; /* its real application */ | |
014d730d | 656 | __be16 port; /* port number in net order */ |
1da177e4 LT |
657 | atomic_t usecnt; /* usage counter */ |
658 | ||
659 | /* output hook: return false if can't linearize. diff set for TCP. */ | |
660 | int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *, | |
3db05fea | 661 | struct sk_buff *, int *diff); |
1da177e4 LT |
662 | |
663 | /* input hook: return false if can't linearize. diff set for TCP. */ | |
664 | int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *, | |
3db05fea | 665 | struct sk_buff *, int *diff); |
1da177e4 LT |
666 | |
667 | /* ip_vs_app initializer */ | |
668 | int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *); | |
669 | ||
670 | /* ip_vs_app finish */ | |
671 | int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *); | |
672 | ||
673 | ||
674 | /* not used now */ | |
675 | int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *, | |
676 | struct ip_vs_protocol *); | |
677 | ||
678 | void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *); | |
679 | ||
680 | int * timeout_table; | |
681 | int * timeouts; | |
682 | int timeouts_size; | |
683 | ||
684 | int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app, | |
685 | int *verdict, struct ip_vs_conn **cpp); | |
686 | ||
687 | struct ip_vs_conn * | |
688 | (*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app, | |
689 | const struct iphdr *iph, unsigned int proto_off, | |
690 | int inverse); | |
691 | ||
692 | struct ip_vs_conn * | |
693 | (*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app, | |
694 | const struct iphdr *iph, unsigned int proto_off, | |
695 | int inverse); | |
696 | ||
697 | int (*state_transition)(struct ip_vs_conn *cp, int direction, | |
698 | const struct sk_buff *skb, | |
699 | struct ip_vs_app *app); | |
700 | ||
701 | void (*timeout_change)(struct ip_vs_app *app, int flags); | |
702 | }; | |
703 | ||
704 | ||
705 | /* | |
706 | * IPVS core functions | |
707 | * (from ip_vs_core.c) | |
708 | */ | |
709 | extern const char *ip_vs_proto_name(unsigned proto); | |
710 | extern void ip_vs_init_hash_table(struct list_head *table, int rows); | |
711 | #define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table(t, sizeof(t)/sizeof(t[0])) | |
712 | ||
713 | #define IP_VS_APP_TYPE_UNSPEC 0 | |
714 | #define IP_VS_APP_TYPE_FTP 1 | |
715 | ||
716 | /* | |
717 | * ip_vs_conn handling functions | |
718 | * (from ip_vs_conn.c) | |
719 | */ | |
720 | ||
721 | /* | |
722 | * IPVS connection entry hash table | |
723 | */ | |
724 | #ifndef CONFIG_IP_VS_TAB_BITS | |
725 | #define CONFIG_IP_VS_TAB_BITS 12 | |
726 | #endif | |
727 | /* make sure that IP_VS_CONN_TAB_BITS is located in [8, 20] */ | |
728 | #if CONFIG_IP_VS_TAB_BITS < 8 | |
729 | #define IP_VS_CONN_TAB_BITS 8 | |
730 | #endif | |
731 | #if CONFIG_IP_VS_TAB_BITS > 20 | |
732 | #define IP_VS_CONN_TAB_BITS 20 | |
733 | #endif | |
734 | #if 8 <= CONFIG_IP_VS_TAB_BITS && CONFIG_IP_VS_TAB_BITS <= 20 | |
735 | #define IP_VS_CONN_TAB_BITS CONFIG_IP_VS_TAB_BITS | |
736 | #endif | |
737 | #define IP_VS_CONN_TAB_SIZE (1 << IP_VS_CONN_TAB_BITS) | |
738 | #define IP_VS_CONN_TAB_MASK (IP_VS_CONN_TAB_SIZE - 1) | |
739 | ||
740 | enum { | |
741 | IP_VS_DIR_INPUT = 0, | |
742 | IP_VS_DIR_OUTPUT, | |
743 | IP_VS_DIR_INPUT_ONLY, | |
744 | IP_VS_DIR_LAST, | |
745 | }; | |
746 | ||
747 | extern struct ip_vs_conn *ip_vs_conn_in_get | |
014d730d | 748 | (int protocol, __be32 s_addr, __be16 s_port, __be32 d_addr, __be16 d_port); |
87375ab4 | 749 | extern struct ip_vs_conn *ip_vs_ct_in_get |
014d730d | 750 | (int protocol, __be32 s_addr, __be16 s_port, __be32 d_addr, __be16 d_port); |
1da177e4 | 751 | extern struct ip_vs_conn *ip_vs_conn_out_get |
014d730d | 752 | (int protocol, __be32 s_addr, __be16 s_port, __be32 d_addr, __be16 d_port); |
1da177e4 LT |
753 | |
754 | /* put back the conn without restarting its timer */ | |
755 | static inline void __ip_vs_conn_put(struct ip_vs_conn *cp) | |
756 | { | |
757 | atomic_dec(&cp->refcnt); | |
758 | } | |
759 | extern void ip_vs_conn_put(struct ip_vs_conn *cp); | |
014d730d | 760 | extern void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport); |
1da177e4 LT |
761 | |
762 | extern struct ip_vs_conn * | |
014d730d AV |
763 | ip_vs_conn_new(int proto, __be32 caddr, __be16 cport, __be32 vaddr, __be16 vport, |
764 | __be32 daddr, __be16 dport, unsigned flags, | |
1da177e4 LT |
765 | struct ip_vs_dest *dest); |
766 | extern void ip_vs_conn_expire_now(struct ip_vs_conn *cp); | |
767 | ||
768 | extern const char * ip_vs_state_name(__u16 proto, int state); | |
769 | ||
770 | extern void ip_vs_tcp_conn_listen(struct ip_vs_conn *cp); | |
771 | extern int ip_vs_check_template(struct ip_vs_conn *ct); | |
772 | extern void ip_vs_secure_tcp_set(int on); | |
773 | extern void ip_vs_random_dropentry(void); | |
774 | extern int ip_vs_conn_init(void); | |
775 | extern void ip_vs_conn_cleanup(void); | |
776 | ||
777 | static inline void ip_vs_control_del(struct ip_vs_conn *cp) | |
778 | { | |
779 | struct ip_vs_conn *ctl_cp = cp->control; | |
780 | if (!ctl_cp) { | |
781 | IP_VS_ERR("request control DEL for uncontrolled: " | |
782 | "%d.%d.%d.%d:%d to %d.%d.%d.%d:%d\n", | |
783 | NIPQUAD(cp->caddr),ntohs(cp->cport), | |
784 | NIPQUAD(cp->vaddr),ntohs(cp->vport)); | |
785 | return; | |
786 | } | |
787 | ||
788 | IP_VS_DBG(7, "DELeting control for: " | |
789 | "cp.dst=%d.%d.%d.%d:%d ctl_cp.dst=%d.%d.%d.%d:%d\n", | |
790 | NIPQUAD(cp->caddr),ntohs(cp->cport), | |
791 | NIPQUAD(ctl_cp->caddr),ntohs(ctl_cp->cport)); | |
792 | ||
793 | cp->control = NULL; | |
794 | if (atomic_read(&ctl_cp->n_control) == 0) { | |
795 | IP_VS_ERR("BUG control DEL with n=0 : " | |
796 | "%d.%d.%d.%d:%d to %d.%d.%d.%d:%d\n", | |
797 | NIPQUAD(cp->caddr),ntohs(cp->cport), | |
798 | NIPQUAD(cp->vaddr),ntohs(cp->vport)); | |
799 | return; | |
800 | } | |
801 | atomic_dec(&ctl_cp->n_control); | |
802 | } | |
803 | ||
804 | static inline void | |
805 | ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp) | |
806 | { | |
807 | if (cp->control) { | |
808 | IP_VS_ERR("request control ADD for already controlled: " | |
809 | "%d.%d.%d.%d:%d to %d.%d.%d.%d:%d\n", | |
810 | NIPQUAD(cp->caddr),ntohs(cp->cport), | |
811 | NIPQUAD(cp->vaddr),ntohs(cp->vport)); | |
812 | ip_vs_control_del(cp); | |
813 | } | |
814 | ||
815 | IP_VS_DBG(7, "ADDing control for: " | |
816 | "cp.dst=%d.%d.%d.%d:%d ctl_cp.dst=%d.%d.%d.%d:%d\n", | |
817 | NIPQUAD(cp->caddr),ntohs(cp->cport), | |
818 | NIPQUAD(ctl_cp->caddr),ntohs(ctl_cp->cport)); | |
819 | ||
820 | cp->control = ctl_cp; | |
821 | atomic_inc(&ctl_cp->n_control); | |
822 | } | |
823 | ||
824 | ||
825 | /* | |
826 | * IPVS application functions | |
827 | * (from ip_vs_app.c) | |
828 | */ | |
829 | #define IP_VS_APP_MAX_PORTS 8 | |
830 | extern int register_ip_vs_app(struct ip_vs_app *app); | |
831 | extern void unregister_ip_vs_app(struct ip_vs_app *app); | |
832 | extern int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp); | |
833 | extern void ip_vs_unbind_app(struct ip_vs_conn *cp); | |
834 | extern int | |
835 | register_ip_vs_app_inc(struct ip_vs_app *app, __u16 proto, __u16 port); | |
836 | extern int ip_vs_app_inc_get(struct ip_vs_app *inc); | |
837 | extern void ip_vs_app_inc_put(struct ip_vs_app *inc); | |
838 | ||
3db05fea HX |
839 | extern int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb); |
840 | extern int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb); | |
dd0fc66f | 841 | extern int ip_vs_skb_replace(struct sk_buff *skb, gfp_t pri, |
1da177e4 LT |
842 | char *o_buf, int o_len, char *n_buf, int n_len); |
843 | extern int ip_vs_app_init(void); | |
844 | extern void ip_vs_app_cleanup(void); | |
845 | ||
846 | ||
847 | /* | |
848 | * IPVS protocol functions (from ip_vs_proto.c) | |
849 | */ | |
850 | extern int ip_vs_protocol_init(void); | |
851 | extern void ip_vs_protocol_cleanup(void); | |
852 | extern void ip_vs_protocol_timeout_change(int flags); | |
853 | extern int *ip_vs_create_timeout_table(int *table, int size); | |
854 | extern int | |
855 | ip_vs_set_state_timeout(int *table, int num, char **names, char *name, int to); | |
856 | extern void | |
857 | ip_vs_tcpudp_debug_packet(struct ip_vs_protocol *pp, const struct sk_buff *skb, | |
858 | int offset, const char *msg); | |
859 | ||
860 | extern struct ip_vs_protocol ip_vs_protocol_tcp; | |
861 | extern struct ip_vs_protocol ip_vs_protocol_udp; | |
862 | extern struct ip_vs_protocol ip_vs_protocol_icmp; | |
863 | extern struct ip_vs_protocol ip_vs_protocol_esp; | |
864 | extern struct ip_vs_protocol ip_vs_protocol_ah; | |
865 | ||
866 | ||
867 | /* | |
868 | * Registering/unregistering scheduler functions | |
869 | * (from ip_vs_sched.c) | |
870 | */ | |
871 | extern int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler); | |
872 | extern int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler); | |
873 | extern int ip_vs_bind_scheduler(struct ip_vs_service *svc, | |
874 | struct ip_vs_scheduler *scheduler); | |
875 | extern int ip_vs_unbind_scheduler(struct ip_vs_service *svc); | |
876 | extern struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name); | |
877 | extern void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler); | |
878 | extern struct ip_vs_conn * | |
879 | ip_vs_schedule(struct ip_vs_service *svc, const struct sk_buff *skb); | |
880 | extern int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb, | |
881 | struct ip_vs_protocol *pp); | |
882 | ||
883 | ||
884 | /* | |
885 | * IPVS control data and functions (from ip_vs_ctl.c) | |
886 | */ | |
887 | extern int sysctl_ip_vs_cache_bypass; | |
888 | extern int sysctl_ip_vs_expire_nodest_conn; | |
889 | extern int sysctl_ip_vs_expire_quiescent_template; | |
890 | extern int sysctl_ip_vs_sync_threshold[2]; | |
891 | extern int sysctl_ip_vs_nat_icmp_send; | |
892 | extern struct ip_vs_stats ip_vs_stats; | |
893 | ||
894 | extern struct ip_vs_service * | |
014d730d | 895 | ip_vs_service_get(__u32 fwmark, __u16 protocol, __be32 vaddr, __be16 vport); |
1da177e4 LT |
896 | |
897 | static inline void ip_vs_service_put(struct ip_vs_service *svc) | |
898 | { | |
899 | atomic_dec(&svc->usecnt); | |
900 | } | |
901 | ||
902 | extern struct ip_vs_dest * | |
014d730d | 903 | ip_vs_lookup_real_service(__u16 protocol, __be32 daddr, __be16 dport); |
1da177e4 LT |
904 | extern int ip_vs_use_count_inc(void); |
905 | extern void ip_vs_use_count_dec(void); | |
906 | extern int ip_vs_control_init(void); | |
907 | extern void ip_vs_control_cleanup(void); | |
1e356f9c RB |
908 | extern struct ip_vs_dest * |
909 | ip_vs_find_dest(__be32 daddr, __be16 dport, | |
910 | __be32 vaddr, __be16 vport, __u16 protocol); | |
911 | extern struct ip_vs_dest *ip_vs_try_bind_dest(struct ip_vs_conn *cp); | |
1da177e4 LT |
912 | |
913 | ||
914 | /* | |
915 | * IPVS sync daemon data and function prototypes | |
916 | * (from ip_vs_sync.c) | |
917 | */ | |
918 | extern volatile int ip_vs_sync_state; | |
919 | extern volatile int ip_vs_master_syncid; | |
920 | extern volatile int ip_vs_backup_syncid; | |
921 | extern char ip_vs_master_mcast_ifn[IP_VS_IFNAME_MAXLEN]; | |
922 | extern char ip_vs_backup_mcast_ifn[IP_VS_IFNAME_MAXLEN]; | |
923 | extern int start_sync_thread(int state, char *mcast_ifn, __u8 syncid); | |
924 | extern int stop_sync_thread(int state); | |
925 | extern void ip_vs_sync_conn(struct ip_vs_conn *cp); | |
926 | ||
927 | ||
928 | /* | |
929 | * IPVS rate estimator prototypes (from ip_vs_est.c) | |
930 | */ | |
931 | extern int ip_vs_new_estimator(struct ip_vs_stats *stats); | |
932 | extern void ip_vs_kill_estimator(struct ip_vs_stats *stats); | |
933 | extern void ip_vs_zero_estimator(struct ip_vs_stats *stats); | |
934 | ||
935 | /* | |
936 | * Various IPVS packet transmitters (from ip_vs_xmit.c) | |
937 | */ | |
938 | extern int ip_vs_null_xmit | |
939 | (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); | |
940 | extern int ip_vs_bypass_xmit | |
941 | (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); | |
942 | extern int ip_vs_nat_xmit | |
943 | (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); | |
944 | extern int ip_vs_tunnel_xmit | |
945 | (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); | |
946 | extern int ip_vs_dr_xmit | |
947 | (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); | |
948 | extern int ip_vs_icmp_xmit | |
949 | (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp, int offset); | |
950 | extern void ip_vs_dst_reset(struct ip_vs_dest *dest); | |
951 | ||
952 | ||
953 | /* | |
954 | * This is a simple mechanism to ignore packets when | |
955 | * we are loaded. Just set ip_vs_drop_rate to 'n' and | |
956 | * we start to drop 1/rate of the packets | |
957 | */ | |
958 | extern int ip_vs_drop_rate; | |
959 | extern int ip_vs_drop_counter; | |
960 | ||
961 | static __inline__ int ip_vs_todrop(void) | |
962 | { | |
963 | if (!ip_vs_drop_rate) return 0; | |
964 | if (--ip_vs_drop_counter > 0) return 0; | |
965 | ip_vs_drop_counter = ip_vs_drop_rate; | |
966 | return 1; | |
967 | } | |
968 | ||
969 | /* | |
970 | * ip_vs_fwd_tag returns the forwarding tag of the connection | |
971 | */ | |
972 | #define IP_VS_FWD_METHOD(cp) (cp->flags & IP_VS_CONN_F_FWD_MASK) | |
973 | ||
732db659 | 974 | static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp) |
1da177e4 LT |
975 | { |
976 | char fwd; | |
977 | ||
978 | switch (IP_VS_FWD_METHOD(cp)) { | |
979 | case IP_VS_CONN_F_MASQ: | |
980 | fwd = 'M'; break; | |
981 | case IP_VS_CONN_F_LOCALNODE: | |
982 | fwd = 'L'; break; | |
983 | case IP_VS_CONN_F_TUNNEL: | |
984 | fwd = 'T'; break; | |
985 | case IP_VS_CONN_F_DROUTE: | |
986 | fwd = 'R'; break; | |
987 | case IP_VS_CONN_F_BYPASS: | |
988 | fwd = 'B'; break; | |
989 | default: | |
990 | fwd = '?'; break; | |
991 | } | |
992 | return fwd; | |
993 | } | |
994 | ||
1da177e4 LT |
995 | extern void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp, |
996 | struct ip_vs_conn *cp, int dir); | |
997 | ||
b1550f22 | 998 | extern __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset); |
1da177e4 | 999 | |
f9214b26 | 1000 | static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum) |
1da177e4 | 1001 | { |
f9214b26 | 1002 | __be32 diff[2] = { ~old, new }; |
1da177e4 | 1003 | |
f9214b26 AV |
1004 | return csum_partial((char *) diff, sizeof(diff), oldsum); |
1005 | } | |
1006 | ||
1007 | static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum) | |
1008 | { | |
1009 | __be16 diff[2] = { ~old, new }; | |
1010 | ||
1011 | return csum_partial((char *) diff, sizeof(diff), oldsum); | |
1da177e4 LT |
1012 | } |
1013 | ||
1014 | #endif /* __KERNEL__ */ | |
1015 | ||
1016 | #endif /* _IP_VS_H */ |