Commit | Line | Data |
---|---|---|
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 */ | |
10 | ||
11 | #define IP_VS_VERSION_CODE 0x010201 | |
12 | #define NVERSION(version) \ | |
13 | (version >> 16) & 0xFF, \ | |
14 | (version >> 8) & 0xFF, \ | |
15 | version & 0xFF | |
16 | ||
17 | /* | |
18 | * Virtual Service Flags | |
19 | */ | |
20 | #define IP_VS_SVC_F_PERSISTENT 0x0001 /* persistent port */ | |
21 | #define IP_VS_SVC_F_HASHED 0x0002 /* hashed entry */ | |
22 | ||
23 | /* | |
24 | * Destination Server Flags | |
25 | */ | |
26 | #define IP_VS_DEST_F_AVAILABLE 0x0001 /* server is available */ | |
27 | #define IP_VS_DEST_F_OVERLOAD 0x0002 /* server is overloaded */ | |
28 | ||
29 | /* | |
30 | * IPVS sync daemon states | |
31 | */ | |
32 | #define IP_VS_STATE_NONE 0x0000 /* daemon is stopped */ | |
33 | #define IP_VS_STATE_MASTER 0x0001 /* started as master */ | |
34 | #define IP_VS_STATE_BACKUP 0x0002 /* started as backup */ | |
35 | ||
36 | /* | |
37 | * IPVS socket options | |
38 | */ | |
39 | #define IP_VS_BASE_CTL (64+1024+64) /* base */ | |
40 | ||
41 | #define IP_VS_SO_SET_NONE IP_VS_BASE_CTL /* just peek */ | |
42 | #define IP_VS_SO_SET_INSERT (IP_VS_BASE_CTL+1) | |
43 | #define IP_VS_SO_SET_ADD (IP_VS_BASE_CTL+2) | |
44 | #define IP_VS_SO_SET_EDIT (IP_VS_BASE_CTL+3) | |
45 | #define IP_VS_SO_SET_DEL (IP_VS_BASE_CTL+4) | |
46 | #define IP_VS_SO_SET_FLUSH (IP_VS_BASE_CTL+5) | |
47 | #define IP_VS_SO_SET_LIST (IP_VS_BASE_CTL+6) | |
48 | #define IP_VS_SO_SET_ADDDEST (IP_VS_BASE_CTL+7) | |
49 | #define IP_VS_SO_SET_DELDEST (IP_VS_BASE_CTL+8) | |
50 | #define IP_VS_SO_SET_EDITDEST (IP_VS_BASE_CTL+9) | |
51 | #define IP_VS_SO_SET_TIMEOUT (IP_VS_BASE_CTL+10) | |
52 | #define IP_VS_SO_SET_STARTDAEMON (IP_VS_BASE_CTL+11) | |
53 | #define IP_VS_SO_SET_STOPDAEMON (IP_VS_BASE_CTL+12) | |
54 | #define IP_VS_SO_SET_RESTORE (IP_VS_BASE_CTL+13) | |
55 | #define IP_VS_SO_SET_SAVE (IP_VS_BASE_CTL+14) | |
56 | #define IP_VS_SO_SET_ZERO (IP_VS_BASE_CTL+15) | |
57 | #define IP_VS_SO_SET_MAX IP_VS_SO_SET_ZERO | |
58 | ||
59 | #define IP_VS_SO_GET_VERSION IP_VS_BASE_CTL | |
60 | #define IP_VS_SO_GET_INFO (IP_VS_BASE_CTL+1) | |
61 | #define IP_VS_SO_GET_SERVICES (IP_VS_BASE_CTL+2) | |
62 | #define IP_VS_SO_GET_SERVICE (IP_VS_BASE_CTL+3) | |
63 | #define IP_VS_SO_GET_DESTS (IP_VS_BASE_CTL+4) | |
64 | #define IP_VS_SO_GET_DEST (IP_VS_BASE_CTL+5) /* not used now */ | |
65 | #define IP_VS_SO_GET_TIMEOUT (IP_VS_BASE_CTL+6) | |
66 | #define IP_VS_SO_GET_DAEMON (IP_VS_BASE_CTL+7) | |
67 | #define IP_VS_SO_GET_MAX IP_VS_SO_GET_DAEMON | |
68 | ||
69 | ||
70 | /* | |
71 | * IPVS Connection Flags | |
72 | */ | |
73 | #define IP_VS_CONN_F_FWD_MASK 0x0007 /* mask for the fwd methods */ | |
74 | #define IP_VS_CONN_F_MASQ 0x0000 /* masquerading/NAT */ | |
75 | #define IP_VS_CONN_F_LOCALNODE 0x0001 /* local node */ | |
76 | #define IP_VS_CONN_F_TUNNEL 0x0002 /* tunneling */ | |
77 | #define IP_VS_CONN_F_DROUTE 0x0003 /* direct routing */ | |
78 | #define IP_VS_CONN_F_BYPASS 0x0004 /* cache bypass */ | |
79 | #define IP_VS_CONN_F_SYNC 0x0020 /* entry created by sync */ | |
80 | #define IP_VS_CONN_F_HASHED 0x0040 /* hashed entry */ | |
81 | #define IP_VS_CONN_F_NOOUTPUT 0x0080 /* no output packets */ | |
82 | #define IP_VS_CONN_F_INACTIVE 0x0100 /* not established */ | |
83 | #define IP_VS_CONN_F_OUT_SEQ 0x0200 /* must do output seq adjust */ | |
84 | #define IP_VS_CONN_F_IN_SEQ 0x0400 /* must do input seq adjust */ | |
85 | #define IP_VS_CONN_F_SEQ_MASK 0x0600 /* in/out sequence mask */ | |
86 | #define IP_VS_CONN_F_NO_CPORT 0x0800 /* no client port set yet */ | |
87375ab4 | 87 | #define IP_VS_CONN_F_TEMPLATE 0x1000 /* template, not connection */ |
1da177e4 LT |
88 | |
89 | /* Move it to better place one day, for now keep it unique */ | |
90 | #define NFC_IPVS_PROPERTY 0x10000 | |
91 | ||
92 | #define IP_VS_SCHEDNAME_MAXLEN 16 | |
93 | #define IP_VS_IFNAME_MAXLEN 16 | |
94 | ||
95 | ||
96 | /* | |
97 | * The struct ip_vs_service_user and struct ip_vs_dest_user are | |
98 | * used to set IPVS rules through setsockopt. | |
99 | */ | |
100 | struct ip_vs_service_user { | |
101 | /* virtual service addresses */ | |
102 | u_int16_t protocol; | |
103 | u_int32_t addr; /* virtual ip address */ | |
104 | u_int16_t port; | |
105 | u_int32_t fwmark; /* firwall mark of service */ | |
106 | ||
107 | /* virtual service options */ | |
108 | char sched_name[IP_VS_SCHEDNAME_MAXLEN]; | |
109 | unsigned flags; /* virtual service flags */ | |
110 | unsigned timeout; /* persistent timeout in sec */ | |
111 | u_int32_t netmask; /* persistent netmask */ | |
112 | }; | |
113 | ||
114 | ||
115 | struct ip_vs_dest_user { | |
116 | /* destination server address */ | |
117 | u_int32_t addr; | |
118 | u_int16_t port; | |
119 | ||
120 | /* real server options */ | |
121 | unsigned conn_flags; /* connection flags */ | |
122 | int weight; /* destination weight */ | |
123 | ||
124 | /* thresholds for active connections */ | |
125 | u_int32_t u_threshold; /* upper threshold */ | |
126 | u_int32_t l_threshold; /* lower threshold */ | |
127 | }; | |
128 | ||
129 | ||
130 | /* | |
131 | * IPVS statistics object (for user space) | |
132 | */ | |
133 | struct ip_vs_stats_user | |
134 | { | |
135 | __u32 conns; /* connections scheduled */ | |
136 | __u32 inpkts; /* incoming packets */ | |
137 | __u32 outpkts; /* outgoing packets */ | |
138 | __u64 inbytes; /* incoming bytes */ | |
139 | __u64 outbytes; /* outgoing bytes */ | |
140 | ||
141 | __u32 cps; /* current connection rate */ | |
142 | __u32 inpps; /* current in packet rate */ | |
143 | __u32 outpps; /* current out packet rate */ | |
144 | __u32 inbps; /* current in byte rate */ | |
145 | __u32 outbps; /* current out byte rate */ | |
146 | }; | |
147 | ||
148 | ||
149 | /* The argument to IP_VS_SO_GET_INFO */ | |
150 | struct ip_vs_getinfo { | |
151 | /* version number */ | |
152 | unsigned int version; | |
153 | ||
154 | /* size of connection hash table */ | |
155 | unsigned int size; | |
156 | ||
157 | /* number of virtual services */ | |
158 | unsigned int num_services; | |
159 | }; | |
160 | ||
161 | ||
162 | /* The argument to IP_VS_SO_GET_SERVICE */ | |
163 | struct ip_vs_service_entry { | |
164 | /* which service: user fills in these */ | |
165 | u_int16_t protocol; | |
166 | u_int32_t addr; /* virtual address */ | |
167 | u_int16_t port; | |
168 | u_int32_t fwmark; /* firwall mark of service */ | |
169 | ||
170 | /* service options */ | |
171 | char sched_name[IP_VS_SCHEDNAME_MAXLEN]; | |
172 | unsigned flags; /* virtual service flags */ | |
173 | unsigned timeout; /* persistent timeout */ | |
174 | u_int32_t netmask; /* persistent netmask */ | |
175 | ||
176 | /* number of real servers */ | |
177 | unsigned int num_dests; | |
178 | ||
179 | /* statistics */ | |
180 | struct ip_vs_stats_user stats; | |
181 | }; | |
182 | ||
183 | ||
184 | struct ip_vs_dest_entry { | |
185 | u_int32_t addr; /* destination address */ | |
186 | u_int16_t port; | |
187 | unsigned conn_flags; /* connection flags */ | |
188 | int weight; /* destination weight */ | |
189 | ||
190 | u_int32_t u_threshold; /* upper threshold */ | |
191 | u_int32_t l_threshold; /* lower threshold */ | |
192 | ||
193 | u_int32_t activeconns; /* active connections */ | |
194 | u_int32_t inactconns; /* inactive connections */ | |
195 | u_int32_t persistconns; /* persistent connections */ | |
196 | ||
197 | /* statistics */ | |
198 | struct ip_vs_stats_user stats; | |
199 | }; | |
200 | ||
201 | ||
202 | /* The argument to IP_VS_SO_GET_DESTS */ | |
203 | struct ip_vs_get_dests { | |
204 | /* which service: user fills in these */ | |
205 | u_int16_t protocol; | |
206 | u_int32_t addr; /* virtual address */ | |
207 | u_int16_t port; | |
208 | u_int32_t fwmark; /* firwall mark of service */ | |
209 | ||
210 | /* number of real servers */ | |
211 | unsigned int num_dests; | |
212 | ||
213 | /* the real servers */ | |
214 | struct ip_vs_dest_entry entrytable[0]; | |
215 | }; | |
216 | ||
217 | ||
218 | /* The argument to IP_VS_SO_GET_SERVICES */ | |
219 | struct ip_vs_get_services { | |
220 | /* number of virtual services */ | |
221 | unsigned int num_services; | |
222 | ||
223 | /* service table */ | |
224 | struct ip_vs_service_entry entrytable[0]; | |
225 | }; | |
226 | ||
227 | ||
228 | /* The argument to IP_VS_SO_GET_TIMEOUT */ | |
229 | struct ip_vs_timeout_user { | |
230 | int tcp_timeout; | |
231 | int tcp_fin_timeout; | |
232 | int udp_timeout; | |
233 | }; | |
234 | ||
235 | ||
236 | /* The argument to IP_VS_SO_GET_DAEMON */ | |
237 | struct ip_vs_daemon_user { | |
238 | /* sync daemon state (master/backup) */ | |
239 | int state; | |
240 | ||
241 | /* multicast interface name */ | |
242 | char mcast_ifn[IP_VS_IFNAME_MAXLEN]; | |
243 | ||
244 | /* SyncID we belong to */ | |
245 | int syncid; | |
246 | }; | |
247 | ||
248 | ||
249 | #ifdef __KERNEL__ | |
250 | ||
251 | #include <linux/config.h> | |
252 | #include <linux/list.h> /* for struct list_head */ | |
253 | #include <linux/spinlock.h> /* for struct rwlock_t */ | |
254 | #include <linux/skbuff.h> /* for struct sk_buff */ | |
255 | #include <linux/ip.h> /* for struct iphdr */ | |
256 | #include <asm/atomic.h> /* for struct atomic_t */ | |
257 | #include <linux/netdevice.h> /* for struct neighbour */ | |
258 | #include <net/dst.h> /* for struct dst_entry */ | |
1da177e4 LT |
259 | #include <net/udp.h> |
260 | #include <linux/compiler.h> | |
261 | ||
262 | ||
263 | #ifdef CONFIG_IP_VS_DEBUG | |
264 | extern int ip_vs_get_debug_level(void); | |
265 | #define IP_VS_DBG(level, msg...) \ | |
266 | do { \ | |
267 | if (level <= ip_vs_get_debug_level()) \ | |
268 | printk(KERN_DEBUG "IPVS: " msg); \ | |
269 | } while (0) | |
270 | #define IP_VS_DBG_RL(msg...) \ | |
271 | do { \ | |
272 | if (net_ratelimit()) \ | |
273 | printk(KERN_DEBUG "IPVS: " msg); \ | |
274 | } while (0) | |
275 | #define IP_VS_DBG_PKT(level, pp, skb, ofs, msg) \ | |
276 | do { \ | |
277 | if (level <= ip_vs_get_debug_level()) \ | |
278 | pp->debug_packet(pp, skb, ofs, msg); \ | |
279 | } while (0) | |
280 | #define IP_VS_DBG_RL_PKT(level, pp, skb, ofs, msg) \ | |
281 | do { \ | |
282 | if (level <= ip_vs_get_debug_level() && \ | |
283 | net_ratelimit()) \ | |
284 | pp->debug_packet(pp, skb, ofs, msg); \ | |
285 | } while (0) | |
286 | #else /* NO DEBUGGING at ALL */ | |
287 | #define IP_VS_DBG(level, msg...) do {} while (0) | |
288 | #define IP_VS_DBG_RL(msg...) do {} while (0) | |
289 | #define IP_VS_DBG_PKT(level, pp, skb, ofs, msg) do {} while (0) | |
290 | #define IP_VS_DBG_RL_PKT(level, pp, skb, ofs, msg) do {} while (0) | |
291 | #endif | |
292 | ||
293 | #define IP_VS_BUG() BUG() | |
294 | #define IP_VS_ERR(msg...) printk(KERN_ERR "IPVS: " msg) | |
295 | #define IP_VS_INFO(msg...) printk(KERN_INFO "IPVS: " msg) | |
296 | #define IP_VS_WARNING(msg...) \ | |
297 | printk(KERN_WARNING "IPVS: " msg) | |
298 | #define IP_VS_ERR_RL(msg...) \ | |
299 | do { \ | |
300 | if (net_ratelimit()) \ | |
301 | printk(KERN_ERR "IPVS: " msg); \ | |
302 | } while (0) | |
303 | ||
304 | #ifdef CONFIG_IP_VS_DEBUG | |
305 | #define EnterFunction(level) \ | |
306 | do { \ | |
307 | if (level <= ip_vs_get_debug_level()) \ | |
308 | printk(KERN_DEBUG "Enter: %s, %s line %i\n", \ | |
309 | __FUNCTION__, __FILE__, __LINE__); \ | |
310 | } while (0) | |
311 | #define LeaveFunction(level) \ | |
312 | do { \ | |
313 | if (level <= ip_vs_get_debug_level()) \ | |
314 | printk(KERN_DEBUG "Leave: %s, %s line %i\n", \ | |
315 | __FUNCTION__, __FILE__, __LINE__); \ | |
316 | } while (0) | |
317 | #else | |
318 | #define EnterFunction(level) do {} while (0) | |
319 | #define LeaveFunction(level) do {} while (0) | |
320 | #endif | |
321 | ||
322 | #define IP_VS_WAIT_WHILE(expr) while (expr) { cpu_relax(); } | |
323 | ||
324 | ||
325 | /* | |
326 | * The port number of FTP service (in network order). | |
327 | */ | |
328 | #define FTPPORT __constant_htons(21) | |
329 | #define FTPDATA __constant_htons(20) | |
330 | ||
331 | /* | |
332 | * IPVS sysctl variables under the /proc/sys/net/ipv4/vs/ | |
333 | */ | |
334 | #define NET_IPV4_VS 21 | |
335 | ||
336 | enum { | |
337 | NET_IPV4_VS_DEBUG_LEVEL=1, | |
338 | NET_IPV4_VS_AMEMTHRESH=2, | |
339 | NET_IPV4_VS_AMDROPRATE=3, | |
340 | NET_IPV4_VS_DROP_ENTRY=4, | |
341 | NET_IPV4_VS_DROP_PACKET=5, | |
342 | NET_IPV4_VS_SECURE_TCP=6, | |
343 | NET_IPV4_VS_TO_ES=7, | |
344 | NET_IPV4_VS_TO_SS=8, | |
345 | NET_IPV4_VS_TO_SR=9, | |
346 | NET_IPV4_VS_TO_FW=10, | |
347 | NET_IPV4_VS_TO_TW=11, | |
348 | NET_IPV4_VS_TO_CL=12, | |
349 | NET_IPV4_VS_TO_CW=13, | |
350 | NET_IPV4_VS_TO_LA=14, | |
351 | NET_IPV4_VS_TO_LI=15, | |
352 | NET_IPV4_VS_TO_SA=16, | |
353 | NET_IPV4_VS_TO_UDP=17, | |
354 | NET_IPV4_VS_TO_ICMP=18, | |
355 | NET_IPV4_VS_LBLC_EXPIRE=19, | |
356 | NET_IPV4_VS_LBLCR_EXPIRE=20, | |
357 | NET_IPV4_VS_CACHE_BYPASS=22, | |
358 | NET_IPV4_VS_EXPIRE_NODEST_CONN=23, | |
359 | NET_IPV4_VS_SYNC_THRESHOLD=24, | |
360 | NET_IPV4_VS_NAT_ICMP_SEND=25, | |
361 | NET_IPV4_VS_EXPIRE_QUIESCENT_TEMPLATE=26, | |
362 | NET_IPV4_VS_LAST | |
363 | }; | |
364 | ||
365 | /* | |
366 | * TCP State Values | |
367 | */ | |
368 | enum { | |
369 | IP_VS_TCP_S_NONE = 0, | |
370 | IP_VS_TCP_S_ESTABLISHED, | |
371 | IP_VS_TCP_S_SYN_SENT, | |
372 | IP_VS_TCP_S_SYN_RECV, | |
373 | IP_VS_TCP_S_FIN_WAIT, | |
374 | IP_VS_TCP_S_TIME_WAIT, | |
375 | IP_VS_TCP_S_CLOSE, | |
376 | IP_VS_TCP_S_CLOSE_WAIT, | |
377 | IP_VS_TCP_S_LAST_ACK, | |
378 | IP_VS_TCP_S_LISTEN, | |
379 | IP_VS_TCP_S_SYNACK, | |
380 | IP_VS_TCP_S_LAST | |
381 | }; | |
382 | ||
383 | /* | |
384 | * UDP State Values | |
385 | */ | |
386 | enum { | |
387 | IP_VS_UDP_S_NORMAL, | |
388 | IP_VS_UDP_S_LAST, | |
389 | }; | |
390 | ||
391 | /* | |
392 | * ICMP State Values | |
393 | */ | |
394 | enum { | |
395 | IP_VS_ICMP_S_NORMAL, | |
396 | IP_VS_ICMP_S_LAST, | |
397 | }; | |
398 | ||
399 | /* | |
400 | * Delta sequence info structure | |
401 | * Each ip_vs_conn has 2 (output AND input seq. changes). | |
402 | * Only used in the VS/NAT. | |
403 | */ | |
404 | struct ip_vs_seq { | |
405 | __u32 init_seq; /* Add delta from this seq */ | |
406 | __u32 delta; /* Delta in sequence numbers */ | |
407 | __u32 previous_delta; /* Delta in sequence numbers | |
408 | before last resized pkt */ | |
409 | }; | |
410 | ||
411 | ||
412 | /* | |
413 | * IPVS statistics object | |
414 | */ | |
415 | struct ip_vs_stats | |
416 | { | |
417 | __u32 conns; /* connections scheduled */ | |
418 | __u32 inpkts; /* incoming packets */ | |
419 | __u32 outpkts; /* outgoing packets */ | |
420 | __u64 inbytes; /* incoming bytes */ | |
421 | __u64 outbytes; /* outgoing bytes */ | |
422 | ||
423 | __u32 cps; /* current connection rate */ | |
424 | __u32 inpps; /* current in packet rate */ | |
425 | __u32 outpps; /* current out packet rate */ | |
426 | __u32 inbps; /* current in byte rate */ | |
427 | __u32 outbps; /* current out byte rate */ | |
428 | ||
429 | spinlock_t lock; /* spin lock */ | |
430 | }; | |
431 | ||
432 | struct ip_vs_conn; | |
433 | struct ip_vs_app; | |
434 | ||
435 | struct ip_vs_protocol { | |
436 | struct ip_vs_protocol *next; | |
437 | char *name; | |
438 | __u16 protocol; | |
439 | int dont_defrag; | |
440 | atomic_t appcnt; /* counter of proto app incs */ | |
441 | int *timeout_table; /* protocol timeout table */ | |
442 | ||
443 | void (*init)(struct ip_vs_protocol *pp); | |
444 | ||
445 | void (*exit)(struct ip_vs_protocol *pp); | |
446 | ||
447 | int (*conn_schedule)(struct sk_buff *skb, | |
448 | struct ip_vs_protocol *pp, | |
449 | int *verdict, struct ip_vs_conn **cpp); | |
450 | ||
451 | struct ip_vs_conn * | |
452 | (*conn_in_get)(const struct sk_buff *skb, | |
453 | struct ip_vs_protocol *pp, | |
454 | const struct iphdr *iph, | |
455 | unsigned int proto_off, | |
456 | int inverse); | |
457 | ||
458 | struct ip_vs_conn * | |
459 | (*conn_out_get)(const struct sk_buff *skb, | |
460 | struct ip_vs_protocol *pp, | |
461 | const struct iphdr *iph, | |
462 | unsigned int proto_off, | |
463 | int inverse); | |
464 | ||
465 | int (*snat_handler)(struct sk_buff **pskb, | |
466 | struct ip_vs_protocol *pp, struct ip_vs_conn *cp); | |
467 | ||
468 | int (*dnat_handler)(struct sk_buff **pskb, | |
469 | struct ip_vs_protocol *pp, struct ip_vs_conn *cp); | |
470 | ||
471 | int (*csum_check)(struct sk_buff *skb, struct ip_vs_protocol *pp); | |
472 | ||
473 | const char *(*state_name)(int state); | |
474 | ||
475 | int (*state_transition)(struct ip_vs_conn *cp, int direction, | |
476 | const struct sk_buff *skb, | |
477 | struct ip_vs_protocol *pp); | |
478 | ||
479 | int (*register_app)(struct ip_vs_app *inc); | |
480 | ||
481 | void (*unregister_app)(struct ip_vs_app *inc); | |
482 | ||
483 | int (*app_conn_bind)(struct ip_vs_conn *cp); | |
484 | ||
485 | void (*debug_packet)(struct ip_vs_protocol *pp, | |
486 | const struct sk_buff *skb, | |
487 | int offset, | |
488 | const char *msg); | |
489 | ||
490 | void (*timeout_change)(struct ip_vs_protocol *pp, int flags); | |
491 | ||
492 | int (*set_state_timeout)(struct ip_vs_protocol *pp, char *sname, int to); | |
493 | }; | |
494 | ||
495 | extern struct ip_vs_protocol * ip_vs_proto_get(unsigned short proto); | |
496 | ||
497 | /* | |
498 | * IP_VS structure allocated for each dynamically scheduled connection | |
499 | */ | |
500 | struct ip_vs_conn { | |
501 | struct list_head c_list; /* hashed list heads */ | |
502 | ||
503 | /* Protocol, addresses and port numbers */ | |
504 | __u32 caddr; /* client address */ | |
505 | __u32 vaddr; /* virtual address */ | |
506 | __u32 daddr; /* destination address */ | |
507 | __u16 cport; | |
508 | __u16 vport; | |
509 | __u16 dport; | |
510 | __u16 protocol; /* Which protocol (TCP/UDP) */ | |
511 | ||
512 | /* counter and timer */ | |
513 | atomic_t refcnt; /* reference count */ | |
514 | struct timer_list timer; /* Expiration timer */ | |
515 | volatile unsigned long timeout; /* timeout */ | |
516 | ||
517 | /* Flags and state transition */ | |
518 | spinlock_t lock; /* lock for state transition */ | |
519 | volatile __u16 flags; /* status flags */ | |
520 | volatile __u16 state; /* state info */ | |
521 | ||
522 | /* Control members */ | |
523 | struct ip_vs_conn *control; /* Master control connection */ | |
524 | atomic_t n_control; /* Number of controlled ones */ | |
525 | struct ip_vs_dest *dest; /* real server */ | |
526 | atomic_t in_pkts; /* incoming packet counter */ | |
527 | ||
528 | /* packet transmitter for different forwarding methods. If it | |
529 | mangles the packet, it must return NF_DROP or better NF_STOLEN, | |
530 | otherwise this must be changed to a sk_buff **. | |
531 | */ | |
532 | int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp, | |
533 | struct ip_vs_protocol *pp); | |
534 | ||
535 | /* Note: we can group the following members into a structure, | |
536 | in order to save more space, and the following members are | |
537 | only used in VS/NAT anyway */ | |
538 | struct ip_vs_app *app; /* bound ip_vs_app object */ | |
539 | void *app_data; /* Application private data */ | |
540 | struct ip_vs_seq in_seq; /* incoming seq. struct */ | |
541 | struct ip_vs_seq out_seq; /* outgoing seq. struct */ | |
542 | }; | |
543 | ||
544 | ||
545 | /* | |
546 | * The information about the virtual service offered to the net | |
547 | * and the forwarding entries | |
548 | */ | |
549 | struct ip_vs_service { | |
550 | struct list_head s_list; /* for normal service table */ | |
551 | struct list_head f_list; /* for fwmark-based service table */ | |
552 | atomic_t refcnt; /* reference counter */ | |
553 | atomic_t usecnt; /* use counter */ | |
554 | ||
555 | __u16 protocol; /* which protocol (TCP/UDP) */ | |
556 | __u32 addr; /* IP address for virtual service */ | |
557 | __u16 port; /* port number for the service */ | |
558 | __u32 fwmark; /* firewall mark of the service */ | |
559 | unsigned flags; /* service status flags */ | |
560 | unsigned timeout; /* persistent timeout in ticks */ | |
561 | __u32 netmask; /* grouping granularity */ | |
562 | ||
563 | struct list_head destinations; /* real server d-linked list */ | |
564 | __u32 num_dests; /* number of servers */ | |
565 | struct ip_vs_stats stats; /* statistics for the service */ | |
566 | struct ip_vs_app *inc; /* bind conns to this app inc */ | |
567 | ||
568 | /* for scheduling */ | |
569 | struct ip_vs_scheduler *scheduler; /* bound scheduler object */ | |
570 | rwlock_t sched_lock; /* lock sched_data */ | |
571 | void *sched_data; /* scheduler application data */ | |
572 | }; | |
573 | ||
574 | ||
575 | /* | |
576 | * The real server destination forwarding entry | |
577 | * with ip address, port number, and so on. | |
578 | */ | |
579 | struct ip_vs_dest { | |
580 | struct list_head n_list; /* for the dests in the service */ | |
581 | struct list_head d_list; /* for table with all the dests */ | |
582 | ||
583 | __u32 addr; /* IP address of the server */ | |
584 | __u16 port; /* port number of the server */ | |
585 | volatile unsigned flags; /* dest status flags */ | |
586 | atomic_t conn_flags; /* flags to copy to conn */ | |
587 | atomic_t weight; /* server weight */ | |
588 | ||
589 | atomic_t refcnt; /* reference counter */ | |
590 | struct ip_vs_stats stats; /* statistics */ | |
591 | ||
592 | /* connection counters and thresholds */ | |
593 | atomic_t activeconns; /* active connections */ | |
594 | atomic_t inactconns; /* inactive connections */ | |
595 | atomic_t persistconns; /* persistent connections */ | |
596 | __u32 u_threshold; /* upper threshold */ | |
597 | __u32 l_threshold; /* lower threshold */ | |
598 | ||
599 | /* for destination cache */ | |
600 | spinlock_t dst_lock; /* lock of dst_cache */ | |
601 | struct dst_entry *dst_cache; /* destination cache entry */ | |
602 | u32 dst_rtos; /* RT_TOS(tos) for dst */ | |
603 | ||
604 | /* for virtual service */ | |
605 | struct ip_vs_service *svc; /* service it belongs to */ | |
606 | __u16 protocol; /* which protocol (TCP/UDP) */ | |
607 | __u32 vaddr; /* virtual IP address */ | |
608 | __u16 vport; /* virtual port number */ | |
609 | __u32 vfwmark; /* firewall mark of service */ | |
610 | }; | |
611 | ||
612 | ||
613 | /* | |
614 | * The scheduler object | |
615 | */ | |
616 | struct ip_vs_scheduler { | |
617 | struct list_head n_list; /* d-linked list head */ | |
618 | char *name; /* scheduler name */ | |
619 | atomic_t refcnt; /* reference counter */ | |
620 | struct module *module; /* THIS_MODULE/NULL */ | |
621 | ||
622 | /* scheduler initializing service */ | |
623 | int (*init_service)(struct ip_vs_service *svc); | |
624 | /* scheduling service finish */ | |
625 | int (*done_service)(struct ip_vs_service *svc); | |
626 | /* scheduler updating service */ | |
627 | int (*update_service)(struct ip_vs_service *svc); | |
628 | ||
629 | /* selecting a server from the given service */ | |
630 | struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc, | |
631 | const struct sk_buff *skb); | |
632 | }; | |
633 | ||
634 | ||
635 | /* | |
636 | * The application module object (a.k.a. app incarnation) | |
637 | */ | |
638 | struct ip_vs_app | |
639 | { | |
640 | struct list_head a_list; /* member in app list */ | |
641 | int type; /* IP_VS_APP_TYPE_xxx */ | |
642 | char *name; /* application module name */ | |
643 | __u16 protocol; | |
644 | struct module *module; /* THIS_MODULE/NULL */ | |
645 | struct list_head incs_list; /* list of incarnations */ | |
646 | ||
647 | /* members for application incarnations */ | |
648 | struct list_head p_list; /* member in proto app list */ | |
649 | struct ip_vs_app *app; /* its real application */ | |
650 | __u16 port; /* port number in net order */ | |
651 | atomic_t usecnt; /* usage counter */ | |
652 | ||
653 | /* output hook: return false if can't linearize. diff set for TCP. */ | |
654 | int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *, | |
655 | struct sk_buff **, int *diff); | |
656 | ||
657 | /* input hook: return false if can't linearize. diff set for TCP. */ | |
658 | int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *, | |
659 | struct sk_buff **, int *diff); | |
660 | ||
661 | /* ip_vs_app initializer */ | |
662 | int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *); | |
663 | ||
664 | /* ip_vs_app finish */ | |
665 | int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *); | |
666 | ||
667 | ||
668 | /* not used now */ | |
669 | int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *, | |
670 | struct ip_vs_protocol *); | |
671 | ||
672 | void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *); | |
673 | ||
674 | int * timeout_table; | |
675 | int * timeouts; | |
676 | int timeouts_size; | |
677 | ||
678 | int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app, | |
679 | int *verdict, struct ip_vs_conn **cpp); | |
680 | ||
681 | struct ip_vs_conn * | |
682 | (*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app, | |
683 | const struct iphdr *iph, unsigned int proto_off, | |
684 | int inverse); | |
685 | ||
686 | struct ip_vs_conn * | |
687 | (*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app, | |
688 | const struct iphdr *iph, unsigned int proto_off, | |
689 | int inverse); | |
690 | ||
691 | int (*state_transition)(struct ip_vs_conn *cp, int direction, | |
692 | const struct sk_buff *skb, | |
693 | struct ip_vs_app *app); | |
694 | ||
695 | void (*timeout_change)(struct ip_vs_app *app, int flags); | |
696 | }; | |
697 | ||
698 | ||
699 | /* | |
700 | * IPVS core functions | |
701 | * (from ip_vs_core.c) | |
702 | */ | |
703 | extern const char *ip_vs_proto_name(unsigned proto); | |
704 | extern void ip_vs_init_hash_table(struct list_head *table, int rows); | |
705 | #define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table(t, sizeof(t)/sizeof(t[0])) | |
706 | ||
707 | #define IP_VS_APP_TYPE_UNSPEC 0 | |
708 | #define IP_VS_APP_TYPE_FTP 1 | |
709 | ||
710 | /* | |
711 | * ip_vs_conn handling functions | |
712 | * (from ip_vs_conn.c) | |
713 | */ | |
714 | ||
715 | /* | |
716 | * IPVS connection entry hash table | |
717 | */ | |
718 | #ifndef CONFIG_IP_VS_TAB_BITS | |
719 | #define CONFIG_IP_VS_TAB_BITS 12 | |
720 | #endif | |
721 | /* make sure that IP_VS_CONN_TAB_BITS is located in [8, 20] */ | |
722 | #if CONFIG_IP_VS_TAB_BITS < 8 | |
723 | #define IP_VS_CONN_TAB_BITS 8 | |
724 | #endif | |
725 | #if CONFIG_IP_VS_TAB_BITS > 20 | |
726 | #define IP_VS_CONN_TAB_BITS 20 | |
727 | #endif | |
728 | #if 8 <= CONFIG_IP_VS_TAB_BITS && CONFIG_IP_VS_TAB_BITS <= 20 | |
729 | #define IP_VS_CONN_TAB_BITS CONFIG_IP_VS_TAB_BITS | |
730 | #endif | |
731 | #define IP_VS_CONN_TAB_SIZE (1 << IP_VS_CONN_TAB_BITS) | |
732 | #define IP_VS_CONN_TAB_MASK (IP_VS_CONN_TAB_SIZE - 1) | |
733 | ||
734 | enum { | |
735 | IP_VS_DIR_INPUT = 0, | |
736 | IP_VS_DIR_OUTPUT, | |
737 | IP_VS_DIR_INPUT_ONLY, | |
738 | IP_VS_DIR_LAST, | |
739 | }; | |
740 | ||
741 | extern struct ip_vs_conn *ip_vs_conn_in_get | |
742 | (int protocol, __u32 s_addr, __u16 s_port, __u32 d_addr, __u16 d_port); | |
87375ab4 JA |
743 | extern struct ip_vs_conn *ip_vs_ct_in_get |
744 | (int protocol, __u32 s_addr, __u16 s_port, __u32 d_addr, __u16 d_port); | |
1da177e4 LT |
745 | extern struct ip_vs_conn *ip_vs_conn_out_get |
746 | (int protocol, __u32 s_addr, __u16 s_port, __u32 d_addr, __u16 d_port); | |
747 | ||
748 | /* put back the conn without restarting its timer */ | |
749 | static inline void __ip_vs_conn_put(struct ip_vs_conn *cp) | |
750 | { | |
751 | atomic_dec(&cp->refcnt); | |
752 | } | |
753 | extern void ip_vs_conn_put(struct ip_vs_conn *cp); | |
754 | extern void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __u16 cport); | |
755 | ||
756 | extern struct ip_vs_conn * | |
757 | ip_vs_conn_new(int proto, __u32 caddr, __u16 cport, __u32 vaddr, __u16 vport, | |
758 | __u32 daddr, __u16 dport, unsigned flags, | |
759 | struct ip_vs_dest *dest); | |
760 | extern void ip_vs_conn_expire_now(struct ip_vs_conn *cp); | |
761 | ||
762 | extern const char * ip_vs_state_name(__u16 proto, int state); | |
763 | ||
764 | extern void ip_vs_tcp_conn_listen(struct ip_vs_conn *cp); | |
765 | extern int ip_vs_check_template(struct ip_vs_conn *ct); | |
766 | extern void ip_vs_secure_tcp_set(int on); | |
767 | extern void ip_vs_random_dropentry(void); | |
768 | extern int ip_vs_conn_init(void); | |
769 | extern void ip_vs_conn_cleanup(void); | |
770 | ||
771 | static inline void ip_vs_control_del(struct ip_vs_conn *cp) | |
772 | { | |
773 | struct ip_vs_conn *ctl_cp = cp->control; | |
774 | if (!ctl_cp) { | |
775 | IP_VS_ERR("request control DEL for uncontrolled: " | |
776 | "%d.%d.%d.%d:%d to %d.%d.%d.%d:%d\n", | |
777 | NIPQUAD(cp->caddr),ntohs(cp->cport), | |
778 | NIPQUAD(cp->vaddr),ntohs(cp->vport)); | |
779 | return; | |
780 | } | |
781 | ||
782 | IP_VS_DBG(7, "DELeting control for: " | |
783 | "cp.dst=%d.%d.%d.%d:%d ctl_cp.dst=%d.%d.%d.%d:%d\n", | |
784 | NIPQUAD(cp->caddr),ntohs(cp->cport), | |
785 | NIPQUAD(ctl_cp->caddr),ntohs(ctl_cp->cport)); | |
786 | ||
787 | cp->control = NULL; | |
788 | if (atomic_read(&ctl_cp->n_control) == 0) { | |
789 | IP_VS_ERR("BUG control DEL with n=0 : " | |
790 | "%d.%d.%d.%d:%d to %d.%d.%d.%d:%d\n", | |
791 | NIPQUAD(cp->caddr),ntohs(cp->cport), | |
792 | NIPQUAD(cp->vaddr),ntohs(cp->vport)); | |
793 | return; | |
794 | } | |
795 | atomic_dec(&ctl_cp->n_control); | |
796 | } | |
797 | ||
798 | static inline void | |
799 | ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp) | |
800 | { | |
801 | if (cp->control) { | |
802 | IP_VS_ERR("request control ADD for already controlled: " | |
803 | "%d.%d.%d.%d:%d to %d.%d.%d.%d:%d\n", | |
804 | NIPQUAD(cp->caddr),ntohs(cp->cport), | |
805 | NIPQUAD(cp->vaddr),ntohs(cp->vport)); | |
806 | ip_vs_control_del(cp); | |
807 | } | |
808 | ||
809 | IP_VS_DBG(7, "ADDing control for: " | |
810 | "cp.dst=%d.%d.%d.%d:%d ctl_cp.dst=%d.%d.%d.%d:%d\n", | |
811 | NIPQUAD(cp->caddr),ntohs(cp->cport), | |
812 | NIPQUAD(ctl_cp->caddr),ntohs(ctl_cp->cport)); | |
813 | ||
814 | cp->control = ctl_cp; | |
815 | atomic_inc(&ctl_cp->n_control); | |
816 | } | |
817 | ||
818 | ||
819 | /* | |
820 | * IPVS application functions | |
821 | * (from ip_vs_app.c) | |
822 | */ | |
823 | #define IP_VS_APP_MAX_PORTS 8 | |
824 | extern int register_ip_vs_app(struct ip_vs_app *app); | |
825 | extern void unregister_ip_vs_app(struct ip_vs_app *app); | |
826 | extern int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp); | |
827 | extern void ip_vs_unbind_app(struct ip_vs_conn *cp); | |
828 | extern int | |
829 | register_ip_vs_app_inc(struct ip_vs_app *app, __u16 proto, __u16 port); | |
830 | extern int ip_vs_app_inc_get(struct ip_vs_app *inc); | |
831 | extern void ip_vs_app_inc_put(struct ip_vs_app *inc); | |
832 | ||
833 | extern int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff **pskb); | |
834 | extern int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff **pskb); | |
8eea00a4 | 835 | extern int ip_vs_skb_replace(struct sk_buff *skb, unsigned int __nocast pri, |
1da177e4 LT |
836 | char *o_buf, int o_len, char *n_buf, int n_len); |
837 | extern int ip_vs_app_init(void); | |
838 | extern void ip_vs_app_cleanup(void); | |
839 | ||
840 | ||
841 | /* | |
842 | * IPVS protocol functions (from ip_vs_proto.c) | |
843 | */ | |
844 | extern int ip_vs_protocol_init(void); | |
845 | extern void ip_vs_protocol_cleanup(void); | |
846 | extern void ip_vs_protocol_timeout_change(int flags); | |
847 | extern int *ip_vs_create_timeout_table(int *table, int size); | |
848 | extern int | |
849 | ip_vs_set_state_timeout(int *table, int num, char **names, char *name, int to); | |
850 | extern void | |
851 | ip_vs_tcpudp_debug_packet(struct ip_vs_protocol *pp, const struct sk_buff *skb, | |
852 | int offset, const char *msg); | |
853 | ||
854 | extern struct ip_vs_protocol ip_vs_protocol_tcp; | |
855 | extern struct ip_vs_protocol ip_vs_protocol_udp; | |
856 | extern struct ip_vs_protocol ip_vs_protocol_icmp; | |
857 | extern struct ip_vs_protocol ip_vs_protocol_esp; | |
858 | extern struct ip_vs_protocol ip_vs_protocol_ah; | |
859 | ||
860 | ||
861 | /* | |
862 | * Registering/unregistering scheduler functions | |
863 | * (from ip_vs_sched.c) | |
864 | */ | |
865 | extern int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler); | |
866 | extern int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler); | |
867 | extern int ip_vs_bind_scheduler(struct ip_vs_service *svc, | |
868 | struct ip_vs_scheduler *scheduler); | |
869 | extern int ip_vs_unbind_scheduler(struct ip_vs_service *svc); | |
870 | extern struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name); | |
871 | extern void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler); | |
872 | extern struct ip_vs_conn * | |
873 | ip_vs_schedule(struct ip_vs_service *svc, const struct sk_buff *skb); | |
874 | extern int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb, | |
875 | struct ip_vs_protocol *pp); | |
876 | ||
877 | ||
878 | /* | |
879 | * IPVS control data and functions (from ip_vs_ctl.c) | |
880 | */ | |
881 | extern int sysctl_ip_vs_cache_bypass; | |
882 | extern int sysctl_ip_vs_expire_nodest_conn; | |
883 | extern int sysctl_ip_vs_expire_quiescent_template; | |
884 | extern int sysctl_ip_vs_sync_threshold[2]; | |
885 | extern int sysctl_ip_vs_nat_icmp_send; | |
886 | extern struct ip_vs_stats ip_vs_stats; | |
887 | ||
888 | extern struct ip_vs_service * | |
889 | ip_vs_service_get(__u32 fwmark, __u16 protocol, __u32 vaddr, __u16 vport); | |
890 | ||
891 | static inline void ip_vs_service_put(struct ip_vs_service *svc) | |
892 | { | |
893 | atomic_dec(&svc->usecnt); | |
894 | } | |
895 | ||
896 | extern struct ip_vs_dest * | |
897 | ip_vs_lookup_real_service(__u16 protocol, __u32 daddr, __u16 dport); | |
898 | extern int ip_vs_use_count_inc(void); | |
899 | extern void ip_vs_use_count_dec(void); | |
900 | extern int ip_vs_control_init(void); | |
901 | extern void ip_vs_control_cleanup(void); | |
902 | ||
903 | ||
904 | /* | |
905 | * IPVS sync daemon data and function prototypes | |
906 | * (from ip_vs_sync.c) | |
907 | */ | |
908 | extern volatile int ip_vs_sync_state; | |
909 | extern volatile int ip_vs_master_syncid; | |
910 | extern volatile int ip_vs_backup_syncid; | |
911 | extern char ip_vs_master_mcast_ifn[IP_VS_IFNAME_MAXLEN]; | |
912 | extern char ip_vs_backup_mcast_ifn[IP_VS_IFNAME_MAXLEN]; | |
913 | extern int start_sync_thread(int state, char *mcast_ifn, __u8 syncid); | |
914 | extern int stop_sync_thread(int state); | |
915 | extern void ip_vs_sync_conn(struct ip_vs_conn *cp); | |
916 | ||
917 | ||
918 | /* | |
919 | * IPVS rate estimator prototypes (from ip_vs_est.c) | |
920 | */ | |
921 | extern int ip_vs_new_estimator(struct ip_vs_stats *stats); | |
922 | extern void ip_vs_kill_estimator(struct ip_vs_stats *stats); | |
923 | extern void ip_vs_zero_estimator(struct ip_vs_stats *stats); | |
924 | ||
925 | /* | |
926 | * Various IPVS packet transmitters (from ip_vs_xmit.c) | |
927 | */ | |
928 | extern int ip_vs_null_xmit | |
929 | (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); | |
930 | extern int ip_vs_bypass_xmit | |
931 | (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); | |
932 | extern int ip_vs_nat_xmit | |
933 | (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); | |
934 | extern int ip_vs_tunnel_xmit | |
935 | (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); | |
936 | extern int ip_vs_dr_xmit | |
937 | (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); | |
938 | extern int ip_vs_icmp_xmit | |
939 | (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp, int offset); | |
940 | extern void ip_vs_dst_reset(struct ip_vs_dest *dest); | |
941 | ||
942 | ||
943 | /* | |
944 | * This is a simple mechanism to ignore packets when | |
945 | * we are loaded. Just set ip_vs_drop_rate to 'n' and | |
946 | * we start to drop 1/rate of the packets | |
947 | */ | |
948 | extern int ip_vs_drop_rate; | |
949 | extern int ip_vs_drop_counter; | |
950 | ||
951 | static __inline__ int ip_vs_todrop(void) | |
952 | { | |
953 | if (!ip_vs_drop_rate) return 0; | |
954 | if (--ip_vs_drop_counter > 0) return 0; | |
955 | ip_vs_drop_counter = ip_vs_drop_rate; | |
956 | return 1; | |
957 | } | |
958 | ||
959 | /* | |
960 | * ip_vs_fwd_tag returns the forwarding tag of the connection | |
961 | */ | |
962 | #define IP_VS_FWD_METHOD(cp) (cp->flags & IP_VS_CONN_F_FWD_MASK) | |
963 | ||
732db659 | 964 | static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp) |
1da177e4 LT |
965 | { |
966 | char fwd; | |
967 | ||
968 | switch (IP_VS_FWD_METHOD(cp)) { | |
969 | case IP_VS_CONN_F_MASQ: | |
970 | fwd = 'M'; break; | |
971 | case IP_VS_CONN_F_LOCALNODE: | |
972 | fwd = 'L'; break; | |
973 | case IP_VS_CONN_F_TUNNEL: | |
974 | fwd = 'T'; break; | |
975 | case IP_VS_CONN_F_DROUTE: | |
976 | fwd = 'R'; break; | |
977 | case IP_VS_CONN_F_BYPASS: | |
978 | fwd = 'B'; break; | |
979 | default: | |
980 | fwd = '?'; break; | |
981 | } | |
982 | return fwd; | |
983 | } | |
984 | ||
985 | extern int ip_vs_make_skb_writable(struct sk_buff **pskb, int len); | |
986 | extern void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp, | |
987 | struct ip_vs_conn *cp, int dir); | |
988 | ||
989 | extern u16 ip_vs_checksum_complete(struct sk_buff *skb, int offset); | |
990 | ||
991 | static inline u16 ip_vs_check_diff(u32 old, u32 new, u16 oldsum) | |
992 | { | |
993 | u32 diff[2] = { old, new }; | |
994 | ||
995 | return csum_fold(csum_partial((char *) diff, sizeof(diff), | |
996 | oldsum ^ 0xFFFF)); | |
997 | } | |
998 | ||
999 | #endif /* __KERNEL__ */ | |
1000 | ||
1001 | #endif /* _IP_VS_H */ |