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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 | 11 | |
90754f8e PE |
12 | #include <linux/sysctl.h> /* For ctl_path */ |
13 | ||
1da177e4 LT |
14 | #define IP_VS_VERSION_CODE 0x010201 |
15 | #define NVERSION(version) \ | |
16 | (version >> 16) & 0xFF, \ | |
17 | (version >> 8) & 0xFF, \ | |
18 | version & 0xFF | |
19 | ||
20 | /* | |
21 | * Virtual Service Flags | |
22 | */ | |
23 | #define IP_VS_SVC_F_PERSISTENT 0x0001 /* persistent port */ | |
24 | #define IP_VS_SVC_F_HASHED 0x0002 /* hashed entry */ | |
25 | ||
26 | /* | |
27 | * Destination Server Flags | |
28 | */ | |
29 | #define IP_VS_DEST_F_AVAILABLE 0x0001 /* server is available */ | |
30 | #define IP_VS_DEST_F_OVERLOAD 0x0002 /* server is overloaded */ | |
31 | ||
32 | /* | |
33 | * IPVS sync daemon states | |
34 | */ | |
35 | #define IP_VS_STATE_NONE 0x0000 /* daemon is stopped */ | |
36 | #define IP_VS_STATE_MASTER 0x0001 /* started as master */ | |
37 | #define IP_VS_STATE_BACKUP 0x0002 /* started as backup */ | |
38 | ||
39 | /* | |
40 | * IPVS socket options | |
41 | */ | |
42 | #define IP_VS_BASE_CTL (64+1024+64) /* base */ | |
43 | ||
44 | #define IP_VS_SO_SET_NONE IP_VS_BASE_CTL /* just peek */ | |
45 | #define IP_VS_SO_SET_INSERT (IP_VS_BASE_CTL+1) | |
46 | #define IP_VS_SO_SET_ADD (IP_VS_BASE_CTL+2) | |
47 | #define IP_VS_SO_SET_EDIT (IP_VS_BASE_CTL+3) | |
48 | #define IP_VS_SO_SET_DEL (IP_VS_BASE_CTL+4) | |
49 | #define IP_VS_SO_SET_FLUSH (IP_VS_BASE_CTL+5) | |
50 | #define IP_VS_SO_SET_LIST (IP_VS_BASE_CTL+6) | |
51 | #define IP_VS_SO_SET_ADDDEST (IP_VS_BASE_CTL+7) | |
52 | #define IP_VS_SO_SET_DELDEST (IP_VS_BASE_CTL+8) | |
53 | #define IP_VS_SO_SET_EDITDEST (IP_VS_BASE_CTL+9) | |
54 | #define IP_VS_SO_SET_TIMEOUT (IP_VS_BASE_CTL+10) | |
55 | #define IP_VS_SO_SET_STARTDAEMON (IP_VS_BASE_CTL+11) | |
56 | #define IP_VS_SO_SET_STOPDAEMON (IP_VS_BASE_CTL+12) | |
57 | #define IP_VS_SO_SET_RESTORE (IP_VS_BASE_CTL+13) | |
58 | #define IP_VS_SO_SET_SAVE (IP_VS_BASE_CTL+14) | |
59 | #define IP_VS_SO_SET_ZERO (IP_VS_BASE_CTL+15) | |
60 | #define IP_VS_SO_SET_MAX IP_VS_SO_SET_ZERO | |
61 | ||
62 | #define IP_VS_SO_GET_VERSION IP_VS_BASE_CTL | |
63 | #define IP_VS_SO_GET_INFO (IP_VS_BASE_CTL+1) | |
64 | #define IP_VS_SO_GET_SERVICES (IP_VS_BASE_CTL+2) | |
65 | #define IP_VS_SO_GET_SERVICE (IP_VS_BASE_CTL+3) | |
66 | #define IP_VS_SO_GET_DESTS (IP_VS_BASE_CTL+4) | |
67 | #define IP_VS_SO_GET_DEST (IP_VS_BASE_CTL+5) /* not used now */ | |
68 | #define IP_VS_SO_GET_TIMEOUT (IP_VS_BASE_CTL+6) | |
69 | #define IP_VS_SO_GET_DAEMON (IP_VS_BASE_CTL+7) | |
70 | #define IP_VS_SO_GET_MAX IP_VS_SO_GET_DAEMON | |
71 | ||
72 | ||
73 | /* | |
74 | * IPVS Connection Flags | |
75 | */ | |
76 | #define IP_VS_CONN_F_FWD_MASK 0x0007 /* mask for the fwd methods */ | |
77 | #define IP_VS_CONN_F_MASQ 0x0000 /* masquerading/NAT */ | |
78 | #define IP_VS_CONN_F_LOCALNODE 0x0001 /* local node */ | |
79 | #define IP_VS_CONN_F_TUNNEL 0x0002 /* tunneling */ | |
80 | #define IP_VS_CONN_F_DROUTE 0x0003 /* direct routing */ | |
81 | #define IP_VS_CONN_F_BYPASS 0x0004 /* cache bypass */ | |
82 | #define IP_VS_CONN_F_SYNC 0x0020 /* entry created by sync */ | |
83 | #define IP_VS_CONN_F_HASHED 0x0040 /* hashed entry */ | |
84 | #define IP_VS_CONN_F_NOOUTPUT 0x0080 /* no output packets */ | |
85 | #define IP_VS_CONN_F_INACTIVE 0x0100 /* not established */ | |
86 | #define IP_VS_CONN_F_OUT_SEQ 0x0200 /* must do output seq adjust */ | |
87 | #define IP_VS_CONN_F_IN_SEQ 0x0400 /* must do input seq adjust */ | |
88 | #define IP_VS_CONN_F_SEQ_MASK 0x0600 /* in/out sequence mask */ | |
89 | #define IP_VS_CONN_F_NO_CPORT 0x0800 /* no client port set yet */ | |
87375ab4 | 90 | #define IP_VS_CONN_F_TEMPLATE 0x1000 /* template, not connection */ |
1da177e4 LT |
91 | |
92 | /* Move it to better place one day, for now keep it unique */ | |
93 | #define NFC_IPVS_PROPERTY 0x10000 | |
94 | ||
95 | #define IP_VS_SCHEDNAME_MAXLEN 16 | |
96 | #define IP_VS_IFNAME_MAXLEN 16 | |
97 | ||
98 | ||
99 | /* | |
100 | * The struct ip_vs_service_user and struct ip_vs_dest_user are | |
101 | * used to set IPVS rules through setsockopt. | |
102 | */ | |
103 | struct ip_vs_service_user { | |
104 | /* virtual service addresses */ | |
105 | u_int16_t protocol; | |
014d730d AV |
106 | __be32 addr; /* virtual ip address */ |
107 | __be16 port; | |
1da177e4 LT |
108 | u_int32_t fwmark; /* firwall mark of service */ |
109 | ||
110 | /* virtual service options */ | |
111 | char sched_name[IP_VS_SCHEDNAME_MAXLEN]; | |
112 | unsigned flags; /* virtual service flags */ | |
113 | unsigned timeout; /* persistent timeout in sec */ | |
014d730d | 114 | __be32 netmask; /* persistent netmask */ |
1da177e4 LT |
115 | }; |
116 | ||
117 | ||
118 | struct ip_vs_dest_user { | |
119 | /* destination server address */ | |
014d730d AV |
120 | __be32 addr; |
121 | __be16 port; | |
1da177e4 LT |
122 | |
123 | /* real server options */ | |
124 | unsigned conn_flags; /* connection flags */ | |
125 | int weight; /* destination weight */ | |
126 | ||
127 | /* thresholds for active connections */ | |
128 | u_int32_t u_threshold; /* upper threshold */ | |
129 | u_int32_t l_threshold; /* lower threshold */ | |
130 | }; | |
131 | ||
132 | ||
133 | /* | |
134 | * IPVS statistics object (for user space) | |
135 | */ | |
136 | struct ip_vs_stats_user | |
137 | { | |
138 | __u32 conns; /* connections scheduled */ | |
139 | __u32 inpkts; /* incoming packets */ | |
140 | __u32 outpkts; /* outgoing packets */ | |
141 | __u64 inbytes; /* incoming bytes */ | |
142 | __u64 outbytes; /* outgoing bytes */ | |
143 | ||
144 | __u32 cps; /* current connection rate */ | |
145 | __u32 inpps; /* current in packet rate */ | |
146 | __u32 outpps; /* current out packet rate */ | |
147 | __u32 inbps; /* current in byte rate */ | |
148 | __u32 outbps; /* current out byte rate */ | |
149 | }; | |
150 | ||
151 | ||
152 | /* The argument to IP_VS_SO_GET_INFO */ | |
153 | struct ip_vs_getinfo { | |
154 | /* version number */ | |
155 | unsigned int version; | |
156 | ||
157 | /* size of connection hash table */ | |
158 | unsigned int size; | |
159 | ||
160 | /* number of virtual services */ | |
161 | unsigned int num_services; | |
162 | }; | |
163 | ||
164 | ||
165 | /* The argument to IP_VS_SO_GET_SERVICE */ | |
166 | struct ip_vs_service_entry { | |
167 | /* which service: user fills in these */ | |
168 | u_int16_t protocol; | |
014d730d AV |
169 | __be32 addr; /* virtual address */ |
170 | __be16 port; | |
1da177e4 LT |
171 | u_int32_t fwmark; /* firwall mark of service */ |
172 | ||
173 | /* service options */ | |
174 | char sched_name[IP_VS_SCHEDNAME_MAXLEN]; | |
175 | unsigned flags; /* virtual service flags */ | |
176 | unsigned timeout; /* persistent timeout */ | |
014d730d | 177 | __be32 netmask; /* persistent netmask */ |
1da177e4 LT |
178 | |
179 | /* number of real servers */ | |
180 | unsigned int num_dests; | |
181 | ||
182 | /* statistics */ | |
183 | struct ip_vs_stats_user stats; | |
184 | }; | |
185 | ||
186 | ||
187 | struct ip_vs_dest_entry { | |
014d730d AV |
188 | __be32 addr; /* destination address */ |
189 | __be16 port; | |
1da177e4 LT |
190 | unsigned conn_flags; /* connection flags */ |
191 | int weight; /* destination weight */ | |
192 | ||
193 | u_int32_t u_threshold; /* upper threshold */ | |
194 | u_int32_t l_threshold; /* lower threshold */ | |
195 | ||
196 | u_int32_t activeconns; /* active connections */ | |
197 | u_int32_t inactconns; /* inactive connections */ | |
198 | u_int32_t persistconns; /* persistent connections */ | |
199 | ||
200 | /* statistics */ | |
201 | struct ip_vs_stats_user stats; | |
202 | }; | |
203 | ||
204 | ||
205 | /* The argument to IP_VS_SO_GET_DESTS */ | |
206 | struct ip_vs_get_dests { | |
207 | /* which service: user fills in these */ | |
208 | u_int16_t protocol; | |
014d730d AV |
209 | __be32 addr; /* virtual address */ |
210 | __be16 port; | |
1da177e4 LT |
211 | u_int32_t fwmark; /* firwall mark of service */ |
212 | ||
213 | /* number of real servers */ | |
214 | unsigned int num_dests; | |
215 | ||
216 | /* the real servers */ | |
217 | struct ip_vs_dest_entry entrytable[0]; | |
218 | }; | |
219 | ||
220 | ||
221 | /* The argument to IP_VS_SO_GET_SERVICES */ | |
222 | struct ip_vs_get_services { | |
223 | /* number of virtual services */ | |
224 | unsigned int num_services; | |
225 | ||
226 | /* service table */ | |
227 | struct ip_vs_service_entry entrytable[0]; | |
228 | }; | |
229 | ||
230 | ||
231 | /* The argument to IP_VS_SO_GET_TIMEOUT */ | |
232 | struct ip_vs_timeout_user { | |
233 | int tcp_timeout; | |
234 | int tcp_fin_timeout; | |
235 | int udp_timeout; | |
236 | }; | |
237 | ||
238 | ||
239 | /* The argument to IP_VS_SO_GET_DAEMON */ | |
240 | struct ip_vs_daemon_user { | |
241 | /* sync daemon state (master/backup) */ | |
242 | int state; | |
243 | ||
244 | /* multicast interface name */ | |
245 | char mcast_ifn[IP_VS_IFNAME_MAXLEN]; | |
246 | ||
247 | /* SyncID we belong to */ | |
248 | int syncid; | |
249 | }; | |
250 | ||
251 | ||
252 | #ifdef __KERNEL__ | |
253 | ||
1da177e4 LT |
254 | #include <linux/list.h> /* for struct list_head */ |
255 | #include <linux/spinlock.h> /* for struct rwlock_t */ | |
1da177e4 | 256 | #include <asm/atomic.h> /* for struct atomic_t */ |
1da177e4 | 257 | #include <linux/compiler.h> |
14c85021 | 258 | #include <linux/timer.h> |
1da177e4 | 259 | |
14c85021 | 260 | #include <net/checksum.h> |
1da177e4 LT |
261 | |
262 | #ifdef CONFIG_IP_VS_DEBUG | |
14c85021 ACM |
263 | #include <linux/net.h> |
264 | ||
1da177e4 LT |
265 | extern int ip_vs_get_debug_level(void); |
266 | #define IP_VS_DBG(level, msg...) \ | |
267 | do { \ | |
268 | if (level <= ip_vs_get_debug_level()) \ | |
269 | printk(KERN_DEBUG "IPVS: " msg); \ | |
270 | } while (0) | |
271 | #define IP_VS_DBG_RL(msg...) \ | |
272 | do { \ | |
273 | if (net_ratelimit()) \ | |
274 | printk(KERN_DEBUG "IPVS: " msg); \ | |
275 | } while (0) | |
276 | #define IP_VS_DBG_PKT(level, pp, skb, ofs, msg) \ | |
277 | do { \ | |
278 | if (level <= ip_vs_get_debug_level()) \ | |
279 | pp->debug_packet(pp, skb, ofs, msg); \ | |
280 | } while (0) | |
281 | #define IP_VS_DBG_RL_PKT(level, pp, skb, ofs, msg) \ | |
282 | do { \ | |
283 | if (level <= ip_vs_get_debug_level() && \ | |
284 | net_ratelimit()) \ | |
285 | pp->debug_packet(pp, skb, ofs, msg); \ | |
286 | } while (0) | |
287 | #else /* NO DEBUGGING at ALL */ | |
288 | #define IP_VS_DBG(level, msg...) do {} while (0) | |
289 | #define IP_VS_DBG_RL(msg...) do {} while (0) | |
290 | #define IP_VS_DBG_PKT(level, pp, skb, ofs, msg) do {} while (0) | |
291 | #define IP_VS_DBG_RL_PKT(level, pp, skb, ofs, msg) do {} while (0) | |
292 | #endif | |
293 | ||
294 | #define IP_VS_BUG() BUG() | |
295 | #define IP_VS_ERR(msg...) printk(KERN_ERR "IPVS: " msg) | |
296 | #define IP_VS_INFO(msg...) printk(KERN_INFO "IPVS: " msg) | |
297 | #define IP_VS_WARNING(msg...) \ | |
298 | printk(KERN_WARNING "IPVS: " msg) | |
299 | #define IP_VS_ERR_RL(msg...) \ | |
300 | do { \ | |
301 | if (net_ratelimit()) \ | |
302 | printk(KERN_ERR "IPVS: " msg); \ | |
303 | } while (0) | |
304 | ||
305 | #ifdef CONFIG_IP_VS_DEBUG | |
306 | #define EnterFunction(level) \ | |
307 | do { \ | |
308 | if (level <= ip_vs_get_debug_level()) \ | |
309 | printk(KERN_DEBUG "Enter: %s, %s line %i\n", \ | |
310 | __FUNCTION__, __FILE__, __LINE__); \ | |
311 | } while (0) | |
312 | #define LeaveFunction(level) \ | |
313 | do { \ | |
314 | if (level <= ip_vs_get_debug_level()) \ | |
315 | printk(KERN_DEBUG "Leave: %s, %s line %i\n", \ | |
316 | __FUNCTION__, __FILE__, __LINE__); \ | |
317 | } while (0) | |
318 | #else | |
319 | #define EnterFunction(level) do {} while (0) | |
320 | #define LeaveFunction(level) do {} while (0) | |
321 | #endif | |
322 | ||
323 | #define IP_VS_WAIT_WHILE(expr) while (expr) { cpu_relax(); } | |
324 | ||
325 | ||
326 | /* | |
327 | * The port number of FTP service (in network order). | |
328 | */ | |
329 | #define FTPPORT __constant_htons(21) | |
330 | #define FTPDATA __constant_htons(20) | |
331 | ||
1da177e4 LT |
332 | /* |
333 | * TCP State Values | |
334 | */ | |
335 | enum { | |
336 | IP_VS_TCP_S_NONE = 0, | |
337 | IP_VS_TCP_S_ESTABLISHED, | |
338 | IP_VS_TCP_S_SYN_SENT, | |
339 | IP_VS_TCP_S_SYN_RECV, | |
340 | IP_VS_TCP_S_FIN_WAIT, | |
341 | IP_VS_TCP_S_TIME_WAIT, | |
342 | IP_VS_TCP_S_CLOSE, | |
343 | IP_VS_TCP_S_CLOSE_WAIT, | |
344 | IP_VS_TCP_S_LAST_ACK, | |
345 | IP_VS_TCP_S_LISTEN, | |
346 | IP_VS_TCP_S_SYNACK, | |
347 | IP_VS_TCP_S_LAST | |
348 | }; | |
349 | ||
350 | /* | |
351 | * UDP State Values | |
352 | */ | |
353 | enum { | |
354 | IP_VS_UDP_S_NORMAL, | |
355 | IP_VS_UDP_S_LAST, | |
356 | }; | |
357 | ||
358 | /* | |
359 | * ICMP State Values | |
360 | */ | |
361 | enum { | |
362 | IP_VS_ICMP_S_NORMAL, | |
363 | IP_VS_ICMP_S_LAST, | |
364 | }; | |
365 | ||
366 | /* | |
367 | * Delta sequence info structure | |
368 | * Each ip_vs_conn has 2 (output AND input seq. changes). | |
369 | * Only used in the VS/NAT. | |
370 | */ | |
371 | struct ip_vs_seq { | |
372 | __u32 init_seq; /* Add delta from this seq */ | |
373 | __u32 delta; /* Delta in sequence numbers */ | |
374 | __u32 previous_delta; /* Delta in sequence numbers | |
375 | before last resized pkt */ | |
376 | }; | |
377 | ||
378 | ||
379 | /* | |
380 | * IPVS statistics object | |
381 | */ | |
382 | struct ip_vs_stats | |
383 | { | |
384 | __u32 conns; /* connections scheduled */ | |
385 | __u32 inpkts; /* incoming packets */ | |
386 | __u32 outpkts; /* outgoing packets */ | |
387 | __u64 inbytes; /* incoming bytes */ | |
388 | __u64 outbytes; /* outgoing bytes */ | |
389 | ||
390 | __u32 cps; /* current connection rate */ | |
391 | __u32 inpps; /* current in packet rate */ | |
392 | __u32 outpps; /* current out packet rate */ | |
393 | __u32 inbps; /* current in byte rate */ | |
394 | __u32 outbps; /* current out byte rate */ | |
395 | ||
396 | spinlock_t lock; /* spin lock */ | |
397 | }; | |
398 | ||
14c85021 ACM |
399 | struct dst_entry; |
400 | struct iphdr; | |
1da177e4 LT |
401 | struct ip_vs_conn; |
402 | struct ip_vs_app; | |
14c85021 | 403 | struct sk_buff; |
1da177e4 LT |
404 | |
405 | struct ip_vs_protocol { | |
406 | struct ip_vs_protocol *next; | |
407 | char *name; | |
2ad17def JA |
408 | u16 protocol; |
409 | u16 num_states; | |
1da177e4 LT |
410 | int dont_defrag; |
411 | atomic_t appcnt; /* counter of proto app incs */ | |
412 | int *timeout_table; /* protocol timeout table */ | |
413 | ||
414 | void (*init)(struct ip_vs_protocol *pp); | |
415 | ||
416 | void (*exit)(struct ip_vs_protocol *pp); | |
417 | ||
418 | int (*conn_schedule)(struct sk_buff *skb, | |
419 | struct ip_vs_protocol *pp, | |
420 | int *verdict, struct ip_vs_conn **cpp); | |
421 | ||
422 | struct ip_vs_conn * | |
423 | (*conn_in_get)(const struct sk_buff *skb, | |
424 | struct ip_vs_protocol *pp, | |
425 | const struct iphdr *iph, | |
426 | unsigned int proto_off, | |
427 | int inverse); | |
428 | ||
429 | struct ip_vs_conn * | |
430 | (*conn_out_get)(const struct sk_buff *skb, | |
431 | struct ip_vs_protocol *pp, | |
432 | const struct iphdr *iph, | |
433 | unsigned int proto_off, | |
434 | int inverse); | |
435 | ||
3db05fea | 436 | int (*snat_handler)(struct sk_buff *skb, |
1da177e4 LT |
437 | struct ip_vs_protocol *pp, struct ip_vs_conn *cp); |
438 | ||
3db05fea | 439 | int (*dnat_handler)(struct sk_buff *skb, |
1da177e4 LT |
440 | struct ip_vs_protocol *pp, struct ip_vs_conn *cp); |
441 | ||
442 | int (*csum_check)(struct sk_buff *skb, struct ip_vs_protocol *pp); | |
443 | ||
444 | const char *(*state_name)(int state); | |
445 | ||
446 | int (*state_transition)(struct ip_vs_conn *cp, int direction, | |
447 | const struct sk_buff *skb, | |
448 | struct ip_vs_protocol *pp); | |
449 | ||
450 | int (*register_app)(struct ip_vs_app *inc); | |
451 | ||
452 | void (*unregister_app)(struct ip_vs_app *inc); | |
453 | ||
454 | int (*app_conn_bind)(struct ip_vs_conn *cp); | |
455 | ||
456 | void (*debug_packet)(struct ip_vs_protocol *pp, | |
457 | const struct sk_buff *skb, | |
458 | int offset, | |
459 | const char *msg); | |
460 | ||
461 | void (*timeout_change)(struct ip_vs_protocol *pp, int flags); | |
462 | ||
463 | int (*set_state_timeout)(struct ip_vs_protocol *pp, char *sname, int to); | |
464 | }; | |
465 | ||
466 | extern struct ip_vs_protocol * ip_vs_proto_get(unsigned short proto); | |
467 | ||
468 | /* | |
469 | * IP_VS structure allocated for each dynamically scheduled connection | |
470 | */ | |
471 | struct ip_vs_conn { | |
472 | struct list_head c_list; /* hashed list heads */ | |
473 | ||
474 | /* Protocol, addresses and port numbers */ | |
014d730d AV |
475 | __be32 caddr; /* client address */ |
476 | __be32 vaddr; /* virtual address */ | |
477 | __be32 daddr; /* destination address */ | |
478 | __be16 cport; | |
479 | __be16 vport; | |
480 | __be16 dport; | |
1da177e4 LT |
481 | __u16 protocol; /* Which protocol (TCP/UDP) */ |
482 | ||
483 | /* counter and timer */ | |
484 | atomic_t refcnt; /* reference count */ | |
485 | struct timer_list timer; /* Expiration timer */ | |
486 | volatile unsigned long timeout; /* timeout */ | |
487 | ||
488 | /* Flags and state transition */ | |
489 | spinlock_t lock; /* lock for state transition */ | |
490 | volatile __u16 flags; /* status flags */ | |
491 | volatile __u16 state; /* state info */ | |
efac5276 RB |
492 | volatile __u16 old_state; /* old state, to be used for |
493 | * state transition triggerd | |
494 | * synchronization | |
495 | */ | |
1da177e4 LT |
496 | |
497 | /* Control members */ | |
498 | struct ip_vs_conn *control; /* Master control connection */ | |
499 | atomic_t n_control; /* Number of controlled ones */ | |
500 | struct ip_vs_dest *dest; /* real server */ | |
501 | atomic_t in_pkts; /* incoming packet counter */ | |
502 | ||
503 | /* packet transmitter for different forwarding methods. If it | |
504 | mangles the packet, it must return NF_DROP or better NF_STOLEN, | |
505 | otherwise this must be changed to a sk_buff **. | |
506 | */ | |
507 | int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp, | |
508 | struct ip_vs_protocol *pp); | |
509 | ||
510 | /* Note: we can group the following members into a structure, | |
511 | in order to save more space, and the following members are | |
512 | only used in VS/NAT anyway */ | |
513 | struct ip_vs_app *app; /* bound ip_vs_app object */ | |
514 | void *app_data; /* Application private data */ | |
515 | struct ip_vs_seq in_seq; /* incoming seq. struct */ | |
516 | struct ip_vs_seq out_seq; /* outgoing seq. struct */ | |
517 | }; | |
518 | ||
519 | ||
520 | /* | |
521 | * The information about the virtual service offered to the net | |
522 | * and the forwarding entries | |
523 | */ | |
524 | struct ip_vs_service { | |
525 | struct list_head s_list; /* for normal service table */ | |
526 | struct list_head f_list; /* for fwmark-based service table */ | |
527 | atomic_t refcnt; /* reference counter */ | |
528 | atomic_t usecnt; /* use counter */ | |
529 | ||
530 | __u16 protocol; /* which protocol (TCP/UDP) */ | |
014d730d AV |
531 | __be32 addr; /* IP address for virtual service */ |
532 | __be16 port; /* port number for the service */ | |
1da177e4 LT |
533 | __u32 fwmark; /* firewall mark of the service */ |
534 | unsigned flags; /* service status flags */ | |
535 | unsigned timeout; /* persistent timeout in ticks */ | |
014d730d | 536 | __be32 netmask; /* grouping granularity */ |
1da177e4 LT |
537 | |
538 | struct list_head destinations; /* real server d-linked list */ | |
539 | __u32 num_dests; /* number of servers */ | |
540 | struct ip_vs_stats stats; /* statistics for the service */ | |
541 | struct ip_vs_app *inc; /* bind conns to this app inc */ | |
542 | ||
543 | /* for scheduling */ | |
544 | struct ip_vs_scheduler *scheduler; /* bound scheduler object */ | |
545 | rwlock_t sched_lock; /* lock sched_data */ | |
546 | void *sched_data; /* scheduler application data */ | |
547 | }; | |
548 | ||
549 | ||
550 | /* | |
551 | * The real server destination forwarding entry | |
552 | * with ip address, port number, and so on. | |
553 | */ | |
554 | struct ip_vs_dest { | |
555 | struct list_head n_list; /* for the dests in the service */ | |
556 | struct list_head d_list; /* for table with all the dests */ | |
557 | ||
014d730d AV |
558 | __be32 addr; /* IP address of the server */ |
559 | __be16 port; /* port number of the server */ | |
1da177e4 LT |
560 | volatile unsigned flags; /* dest status flags */ |
561 | atomic_t conn_flags; /* flags to copy to conn */ | |
562 | atomic_t weight; /* server weight */ | |
563 | ||
564 | atomic_t refcnt; /* reference counter */ | |
565 | struct ip_vs_stats stats; /* statistics */ | |
566 | ||
567 | /* connection counters and thresholds */ | |
568 | atomic_t activeconns; /* active connections */ | |
569 | atomic_t inactconns; /* inactive connections */ | |
570 | atomic_t persistconns; /* persistent connections */ | |
571 | __u32 u_threshold; /* upper threshold */ | |
572 | __u32 l_threshold; /* lower threshold */ | |
573 | ||
574 | /* for destination cache */ | |
575 | spinlock_t dst_lock; /* lock of dst_cache */ | |
576 | struct dst_entry *dst_cache; /* destination cache entry */ | |
577 | u32 dst_rtos; /* RT_TOS(tos) for dst */ | |
578 | ||
579 | /* for virtual service */ | |
580 | struct ip_vs_service *svc; /* service it belongs to */ | |
581 | __u16 protocol; /* which protocol (TCP/UDP) */ | |
014d730d AV |
582 | __be32 vaddr; /* virtual IP address */ |
583 | __be16 vport; /* virtual port number */ | |
1da177e4 LT |
584 | __u32 vfwmark; /* firewall mark of service */ |
585 | }; | |
586 | ||
587 | ||
588 | /* | |
589 | * The scheduler object | |
590 | */ | |
591 | struct ip_vs_scheduler { | |
592 | struct list_head n_list; /* d-linked list head */ | |
593 | char *name; /* scheduler name */ | |
594 | atomic_t refcnt; /* reference counter */ | |
595 | struct module *module; /* THIS_MODULE/NULL */ | |
596 | ||
597 | /* scheduler initializing service */ | |
598 | int (*init_service)(struct ip_vs_service *svc); | |
599 | /* scheduling service finish */ | |
600 | int (*done_service)(struct ip_vs_service *svc); | |
601 | /* scheduler updating service */ | |
602 | int (*update_service)(struct ip_vs_service *svc); | |
603 | ||
604 | /* selecting a server from the given service */ | |
605 | struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc, | |
606 | const struct sk_buff *skb); | |
607 | }; | |
608 | ||
609 | ||
610 | /* | |
611 | * The application module object (a.k.a. app incarnation) | |
612 | */ | |
613 | struct ip_vs_app | |
614 | { | |
615 | struct list_head a_list; /* member in app list */ | |
616 | int type; /* IP_VS_APP_TYPE_xxx */ | |
617 | char *name; /* application module name */ | |
618 | __u16 protocol; | |
619 | struct module *module; /* THIS_MODULE/NULL */ | |
620 | struct list_head incs_list; /* list of incarnations */ | |
621 | ||
622 | /* members for application incarnations */ | |
623 | struct list_head p_list; /* member in proto app list */ | |
624 | struct ip_vs_app *app; /* its real application */ | |
014d730d | 625 | __be16 port; /* port number in net order */ |
1da177e4 LT |
626 | atomic_t usecnt; /* usage counter */ |
627 | ||
628 | /* output hook: return false if can't linearize. diff set for TCP. */ | |
629 | int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *, | |
3db05fea | 630 | struct sk_buff *, int *diff); |
1da177e4 LT |
631 | |
632 | /* input hook: return false if can't linearize. diff set for TCP. */ | |
633 | int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *, | |
3db05fea | 634 | struct sk_buff *, int *diff); |
1da177e4 LT |
635 | |
636 | /* ip_vs_app initializer */ | |
637 | int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *); | |
638 | ||
639 | /* ip_vs_app finish */ | |
640 | int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *); | |
641 | ||
642 | ||
643 | /* not used now */ | |
644 | int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *, | |
645 | struct ip_vs_protocol *); | |
646 | ||
647 | void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *); | |
648 | ||
649 | int * timeout_table; | |
650 | int * timeouts; | |
651 | int timeouts_size; | |
652 | ||
653 | int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app, | |
654 | int *verdict, struct ip_vs_conn **cpp); | |
655 | ||
656 | struct ip_vs_conn * | |
657 | (*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app, | |
658 | const struct iphdr *iph, unsigned int proto_off, | |
659 | int inverse); | |
660 | ||
661 | struct ip_vs_conn * | |
662 | (*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app, | |
663 | const struct iphdr *iph, unsigned int proto_off, | |
664 | int inverse); | |
665 | ||
666 | int (*state_transition)(struct ip_vs_conn *cp, int direction, | |
667 | const struct sk_buff *skb, | |
668 | struct ip_vs_app *app); | |
669 | ||
670 | void (*timeout_change)(struct ip_vs_app *app, int flags); | |
671 | }; | |
672 | ||
673 | ||
674 | /* | |
675 | * IPVS core functions | |
676 | * (from ip_vs_core.c) | |
677 | */ | |
678 | extern const char *ip_vs_proto_name(unsigned proto); | |
679 | extern void ip_vs_init_hash_table(struct list_head *table, int rows); | |
680 | #define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table(t, sizeof(t)/sizeof(t[0])) | |
681 | ||
1da177e4 LT |
682 | #define IP_VS_APP_TYPE_FTP 1 |
683 | ||
684 | /* | |
685 | * ip_vs_conn handling functions | |
686 | * (from ip_vs_conn.c) | |
687 | */ | |
688 | ||
689 | /* | |
690 | * IPVS connection entry hash table | |
691 | */ | |
692 | #ifndef CONFIG_IP_VS_TAB_BITS | |
693 | #define CONFIG_IP_VS_TAB_BITS 12 | |
694 | #endif | |
695 | /* make sure that IP_VS_CONN_TAB_BITS is located in [8, 20] */ | |
696 | #if CONFIG_IP_VS_TAB_BITS < 8 | |
697 | #define IP_VS_CONN_TAB_BITS 8 | |
698 | #endif | |
699 | #if CONFIG_IP_VS_TAB_BITS > 20 | |
700 | #define IP_VS_CONN_TAB_BITS 20 | |
701 | #endif | |
702 | #if 8 <= CONFIG_IP_VS_TAB_BITS && CONFIG_IP_VS_TAB_BITS <= 20 | |
703 | #define IP_VS_CONN_TAB_BITS CONFIG_IP_VS_TAB_BITS | |
704 | #endif | |
705 | #define IP_VS_CONN_TAB_SIZE (1 << IP_VS_CONN_TAB_BITS) | |
706 | #define IP_VS_CONN_TAB_MASK (IP_VS_CONN_TAB_SIZE - 1) | |
707 | ||
708 | enum { | |
709 | IP_VS_DIR_INPUT = 0, | |
710 | IP_VS_DIR_OUTPUT, | |
711 | IP_VS_DIR_INPUT_ONLY, | |
712 | IP_VS_DIR_LAST, | |
713 | }; | |
714 | ||
715 | extern struct ip_vs_conn *ip_vs_conn_in_get | |
014d730d | 716 | (int protocol, __be32 s_addr, __be16 s_port, __be32 d_addr, __be16 d_port); |
87375ab4 | 717 | extern struct ip_vs_conn *ip_vs_ct_in_get |
014d730d | 718 | (int protocol, __be32 s_addr, __be16 s_port, __be32 d_addr, __be16 d_port); |
1da177e4 | 719 | extern struct ip_vs_conn *ip_vs_conn_out_get |
014d730d | 720 | (int protocol, __be32 s_addr, __be16 s_port, __be32 d_addr, __be16 d_port); |
1da177e4 LT |
721 | |
722 | /* put back the conn without restarting its timer */ | |
723 | static inline void __ip_vs_conn_put(struct ip_vs_conn *cp) | |
724 | { | |
725 | atomic_dec(&cp->refcnt); | |
726 | } | |
727 | extern void ip_vs_conn_put(struct ip_vs_conn *cp); | |
014d730d | 728 | extern void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport); |
1da177e4 LT |
729 | |
730 | extern struct ip_vs_conn * | |
014d730d AV |
731 | ip_vs_conn_new(int proto, __be32 caddr, __be16 cport, __be32 vaddr, __be16 vport, |
732 | __be32 daddr, __be16 dport, unsigned flags, | |
1da177e4 LT |
733 | struct ip_vs_dest *dest); |
734 | extern void ip_vs_conn_expire_now(struct ip_vs_conn *cp); | |
735 | ||
736 | extern const char * ip_vs_state_name(__u16 proto, int state); | |
737 | ||
738 | extern void ip_vs_tcp_conn_listen(struct ip_vs_conn *cp); | |
739 | extern int ip_vs_check_template(struct ip_vs_conn *ct); | |
1da177e4 LT |
740 | extern void ip_vs_random_dropentry(void); |
741 | extern int ip_vs_conn_init(void); | |
742 | extern void ip_vs_conn_cleanup(void); | |
743 | ||
744 | static inline void ip_vs_control_del(struct ip_vs_conn *cp) | |
745 | { | |
746 | struct ip_vs_conn *ctl_cp = cp->control; | |
747 | if (!ctl_cp) { | |
748 | IP_VS_ERR("request control DEL for uncontrolled: " | |
749 | "%d.%d.%d.%d:%d to %d.%d.%d.%d:%d\n", | |
750 | NIPQUAD(cp->caddr),ntohs(cp->cport), | |
751 | NIPQUAD(cp->vaddr),ntohs(cp->vport)); | |
752 | return; | |
753 | } | |
754 | ||
755 | IP_VS_DBG(7, "DELeting control for: " | |
756 | "cp.dst=%d.%d.%d.%d:%d ctl_cp.dst=%d.%d.%d.%d:%d\n", | |
757 | NIPQUAD(cp->caddr),ntohs(cp->cport), | |
758 | NIPQUAD(ctl_cp->caddr),ntohs(ctl_cp->cport)); | |
759 | ||
760 | cp->control = NULL; | |
761 | if (atomic_read(&ctl_cp->n_control) == 0) { | |
762 | IP_VS_ERR("BUG control DEL with n=0 : " | |
763 | "%d.%d.%d.%d:%d to %d.%d.%d.%d:%d\n", | |
764 | NIPQUAD(cp->caddr),ntohs(cp->cport), | |
765 | NIPQUAD(cp->vaddr),ntohs(cp->vport)); | |
766 | return; | |
767 | } | |
768 | atomic_dec(&ctl_cp->n_control); | |
769 | } | |
770 | ||
771 | static inline void | |
772 | ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp) | |
773 | { | |
774 | if (cp->control) { | |
775 | IP_VS_ERR("request control ADD for already controlled: " | |
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 | ip_vs_control_del(cp); | |
780 | } | |
781 | ||
782 | IP_VS_DBG(7, "ADDing 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 = ctl_cp; | |
788 | atomic_inc(&ctl_cp->n_control); | |
789 | } | |
790 | ||
791 | ||
792 | /* | |
793 | * IPVS application functions | |
794 | * (from ip_vs_app.c) | |
795 | */ | |
796 | #define IP_VS_APP_MAX_PORTS 8 | |
797 | extern int register_ip_vs_app(struct ip_vs_app *app); | |
798 | extern void unregister_ip_vs_app(struct ip_vs_app *app); | |
799 | extern int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp); | |
800 | extern void ip_vs_unbind_app(struct ip_vs_conn *cp); | |
801 | extern int | |
802 | register_ip_vs_app_inc(struct ip_vs_app *app, __u16 proto, __u16 port); | |
803 | extern int ip_vs_app_inc_get(struct ip_vs_app *inc); | |
804 | extern void ip_vs_app_inc_put(struct ip_vs_app *inc); | |
805 | ||
3db05fea HX |
806 | extern int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb); |
807 | extern int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb); | |
dd0fc66f | 808 | extern int ip_vs_skb_replace(struct sk_buff *skb, gfp_t pri, |
1da177e4 LT |
809 | char *o_buf, int o_len, char *n_buf, int n_len); |
810 | extern int ip_vs_app_init(void); | |
811 | extern void ip_vs_app_cleanup(void); | |
812 | ||
813 | ||
814 | /* | |
815 | * IPVS protocol functions (from ip_vs_proto.c) | |
816 | */ | |
817 | extern int ip_vs_protocol_init(void); | |
818 | extern void ip_vs_protocol_cleanup(void); | |
819 | extern void ip_vs_protocol_timeout_change(int flags); | |
820 | extern int *ip_vs_create_timeout_table(int *table, int size); | |
821 | extern int | |
822 | ip_vs_set_state_timeout(int *table, int num, char **names, char *name, int to); | |
823 | extern void | |
824 | ip_vs_tcpudp_debug_packet(struct ip_vs_protocol *pp, const struct sk_buff *skb, | |
825 | int offset, const char *msg); | |
826 | ||
827 | extern struct ip_vs_protocol ip_vs_protocol_tcp; | |
828 | extern struct ip_vs_protocol ip_vs_protocol_udp; | |
829 | extern struct ip_vs_protocol ip_vs_protocol_icmp; | |
830 | extern struct ip_vs_protocol ip_vs_protocol_esp; | |
831 | extern struct ip_vs_protocol ip_vs_protocol_ah; | |
832 | ||
833 | ||
834 | /* | |
835 | * Registering/unregistering scheduler functions | |
836 | * (from ip_vs_sched.c) | |
837 | */ | |
838 | extern int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler); | |
839 | extern int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler); | |
840 | extern int ip_vs_bind_scheduler(struct ip_vs_service *svc, | |
841 | struct ip_vs_scheduler *scheduler); | |
842 | extern int ip_vs_unbind_scheduler(struct ip_vs_service *svc); | |
843 | extern struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name); | |
844 | extern void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler); | |
845 | extern struct ip_vs_conn * | |
846 | ip_vs_schedule(struct ip_vs_service *svc, const struct sk_buff *skb); | |
847 | extern int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb, | |
848 | struct ip_vs_protocol *pp); | |
849 | ||
850 | ||
851 | /* | |
852 | * IPVS control data and functions (from ip_vs_ctl.c) | |
853 | */ | |
854 | extern int sysctl_ip_vs_cache_bypass; | |
855 | extern int sysctl_ip_vs_expire_nodest_conn; | |
856 | extern int sysctl_ip_vs_expire_quiescent_template; | |
857 | extern int sysctl_ip_vs_sync_threshold[2]; | |
858 | extern int sysctl_ip_vs_nat_icmp_send; | |
859 | extern struct ip_vs_stats ip_vs_stats; | |
90754f8e | 860 | extern struct ctl_path net_vs_ctl_path[]; |
1da177e4 LT |
861 | |
862 | extern struct ip_vs_service * | |
014d730d | 863 | ip_vs_service_get(__u32 fwmark, __u16 protocol, __be32 vaddr, __be16 vport); |
1da177e4 LT |
864 | |
865 | static inline void ip_vs_service_put(struct ip_vs_service *svc) | |
866 | { | |
867 | atomic_dec(&svc->usecnt); | |
868 | } | |
869 | ||
870 | extern struct ip_vs_dest * | |
014d730d | 871 | ip_vs_lookup_real_service(__u16 protocol, __be32 daddr, __be16 dport); |
1da177e4 LT |
872 | extern int ip_vs_use_count_inc(void); |
873 | extern void ip_vs_use_count_dec(void); | |
874 | extern int ip_vs_control_init(void); | |
875 | extern void ip_vs_control_cleanup(void); | |
1e356f9c RB |
876 | extern struct ip_vs_dest * |
877 | ip_vs_find_dest(__be32 daddr, __be16 dport, | |
878 | __be32 vaddr, __be16 vport, __u16 protocol); | |
879 | extern struct ip_vs_dest *ip_vs_try_bind_dest(struct ip_vs_conn *cp); | |
1da177e4 LT |
880 | |
881 | ||
882 | /* | |
883 | * IPVS sync daemon data and function prototypes | |
884 | * (from ip_vs_sync.c) | |
885 | */ | |
886 | extern volatile int ip_vs_sync_state; | |
887 | extern volatile int ip_vs_master_syncid; | |
888 | extern volatile int ip_vs_backup_syncid; | |
889 | extern char ip_vs_master_mcast_ifn[IP_VS_IFNAME_MAXLEN]; | |
890 | extern char ip_vs_backup_mcast_ifn[IP_VS_IFNAME_MAXLEN]; | |
891 | extern int start_sync_thread(int state, char *mcast_ifn, __u8 syncid); | |
892 | extern int stop_sync_thread(int state); | |
893 | extern void ip_vs_sync_conn(struct ip_vs_conn *cp); | |
894 | ||
895 | ||
896 | /* | |
897 | * IPVS rate estimator prototypes (from ip_vs_est.c) | |
898 | */ | |
899 | extern int ip_vs_new_estimator(struct ip_vs_stats *stats); | |
900 | extern void ip_vs_kill_estimator(struct ip_vs_stats *stats); | |
901 | extern void ip_vs_zero_estimator(struct ip_vs_stats *stats); | |
902 | ||
903 | /* | |
904 | * Various IPVS packet transmitters (from ip_vs_xmit.c) | |
905 | */ | |
906 | extern int ip_vs_null_xmit | |
907 | (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); | |
908 | extern int ip_vs_bypass_xmit | |
909 | (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); | |
910 | extern int ip_vs_nat_xmit | |
911 | (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); | |
912 | extern int ip_vs_tunnel_xmit | |
913 | (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); | |
914 | extern int ip_vs_dr_xmit | |
915 | (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); | |
916 | extern int ip_vs_icmp_xmit | |
917 | (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp, int offset); | |
918 | extern void ip_vs_dst_reset(struct ip_vs_dest *dest); | |
919 | ||
920 | ||
921 | /* | |
922 | * This is a simple mechanism to ignore packets when | |
923 | * we are loaded. Just set ip_vs_drop_rate to 'n' and | |
924 | * we start to drop 1/rate of the packets | |
925 | */ | |
926 | extern int ip_vs_drop_rate; | |
927 | extern int ip_vs_drop_counter; | |
928 | ||
929 | static __inline__ int ip_vs_todrop(void) | |
930 | { | |
931 | if (!ip_vs_drop_rate) return 0; | |
932 | if (--ip_vs_drop_counter > 0) return 0; | |
933 | ip_vs_drop_counter = ip_vs_drop_rate; | |
934 | return 1; | |
935 | } | |
936 | ||
937 | /* | |
938 | * ip_vs_fwd_tag returns the forwarding tag of the connection | |
939 | */ | |
940 | #define IP_VS_FWD_METHOD(cp) (cp->flags & IP_VS_CONN_F_FWD_MASK) | |
941 | ||
732db659 | 942 | static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp) |
1da177e4 LT |
943 | { |
944 | char fwd; | |
945 | ||
946 | switch (IP_VS_FWD_METHOD(cp)) { | |
947 | case IP_VS_CONN_F_MASQ: | |
948 | fwd = 'M'; break; | |
949 | case IP_VS_CONN_F_LOCALNODE: | |
950 | fwd = 'L'; break; | |
951 | case IP_VS_CONN_F_TUNNEL: | |
952 | fwd = 'T'; break; | |
953 | case IP_VS_CONN_F_DROUTE: | |
954 | fwd = 'R'; break; | |
955 | case IP_VS_CONN_F_BYPASS: | |
956 | fwd = 'B'; break; | |
957 | default: | |
958 | fwd = '?'; break; | |
959 | } | |
960 | return fwd; | |
961 | } | |
962 | ||
1da177e4 LT |
963 | extern void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp, |
964 | struct ip_vs_conn *cp, int dir); | |
965 | ||
b1550f22 | 966 | extern __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset); |
1da177e4 | 967 | |
f9214b26 | 968 | static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum) |
1da177e4 | 969 | { |
f9214b26 | 970 | __be32 diff[2] = { ~old, new }; |
1da177e4 | 971 | |
f9214b26 AV |
972 | return csum_partial((char *) diff, sizeof(diff), oldsum); |
973 | } | |
974 | ||
975 | static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum) | |
976 | { | |
977 | __be16 diff[2] = { ~old, new }; | |
978 | ||
979 | return csum_partial((char *) diff, sizeof(diff), oldsum); | |
1da177e4 LT |
980 | } |
981 | ||
982 | #endif /* __KERNEL__ */ | |
983 | ||
984 | #endif /* _IP_VS_H */ |