Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * IP Virtual Server | |
3 | * data structure and functionality definitions | |
4 | */ | |
5 | ||
bc4768eb JV |
6 | #ifndef _NET_IP_VS_H |
7 | #define _NET_IP_VS_H | |
1da177e4 | 8 | |
bc4768eb | 9 | #include <linux/ip_vs.h> /* definitions shared with userland */ |
1da177e4 | 10 | |
bc4768eb | 11 | /* old ipvsadm versions still include this file directly */ |
1da177e4 LT |
12 | #ifdef __KERNEL__ |
13 | ||
bc4768eb JV |
14 | #include <asm/types.h> /* for __uXX types */ |
15 | ||
16 | #include <linux/sysctl.h> /* for ctl_path */ | |
1da177e4 LT |
17 | #include <linux/list.h> /* for struct list_head */ |
18 | #include <linux/spinlock.h> /* for struct rwlock_t */ | |
1da177e4 | 19 | #include <asm/atomic.h> /* for struct atomic_t */ |
1da177e4 | 20 | #include <linux/compiler.h> |
14c85021 | 21 | #include <linux/timer.h> |
1da177e4 | 22 | |
14c85021 | 23 | #include <net/checksum.h> |
e7ade46a | 24 | #include <linux/netfilter.h> /* for union nf_inet_addr */ |
1668e010 | 25 | #include <linux/ip.h> |
e7ade46a JV |
26 | #include <linux/ipv6.h> /* for struct ipv6hdr */ |
27 | #include <net/ipv6.h> /* for ipv6_addr_copy */ | |
cf356d69 | 28 | #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) |
f4bc17cd JA |
29 | #include <net/netfilter/nf_conntrack.h> |
30 | #endif | |
6f7edb48 CB |
31 | |
32 | /* Connections' size value needed by ip_vs_ctl.c */ | |
33 | extern int ip_vs_conn_tab_size; | |
34 | ||
35 | ||
64aae3cb JV |
36 | struct ip_vs_iphdr { |
37 | int len; | |
38 | __u8 protocol; | |
39 | union nf_inet_addr saddr; | |
40 | union nf_inet_addr daddr; | |
41 | }; | |
42 | ||
43 | static inline void | |
44 | ip_vs_fill_iphdr(int af, const void *nh, struct ip_vs_iphdr *iphdr) | |
45 | { | |
46 | #ifdef CONFIG_IP_VS_IPV6 | |
47 | if (af == AF_INET6) { | |
48 | const struct ipv6hdr *iph = nh; | |
49 | iphdr->len = sizeof(struct ipv6hdr); | |
50 | iphdr->protocol = iph->nexthdr; | |
51 | ipv6_addr_copy(&iphdr->saddr.in6, &iph->saddr); | |
52 | ipv6_addr_copy(&iphdr->daddr.in6, &iph->daddr); | |
53 | } else | |
54 | #endif | |
55 | { | |
56 | const struct iphdr *iph = nh; | |
57 | iphdr->len = iph->ihl * 4; | |
58 | iphdr->protocol = iph->protocol; | |
59 | iphdr->saddr.ip = iph->saddr; | |
60 | iphdr->daddr.ip = iph->daddr; | |
61 | } | |
62 | } | |
63 | ||
64 | static inline void ip_vs_addr_copy(int af, union nf_inet_addr *dst, | |
65 | const union nf_inet_addr *src) | |
66 | { | |
67 | #ifdef CONFIG_IP_VS_IPV6 | |
68 | if (af == AF_INET6) | |
69 | ipv6_addr_copy(&dst->in6, &src->in6); | |
70 | else | |
71 | #endif | |
72 | dst->ip = src->ip; | |
73 | } | |
74 | ||
75 | static inline int ip_vs_addr_equal(int af, const union nf_inet_addr *a, | |
76 | const union nf_inet_addr *b) | |
77 | { | |
78 | #ifdef CONFIG_IP_VS_IPV6 | |
79 | if (af == AF_INET6) | |
80 | return ipv6_addr_equal(&a->in6, &b->in6); | |
81 | #endif | |
82 | return a->ip == b->ip; | |
83 | } | |
84 | ||
1da177e4 | 85 | #ifdef CONFIG_IP_VS_DEBUG |
14c85021 ACM |
86 | #include <linux/net.h> |
87 | ||
1da177e4 | 88 | extern int ip_vs_get_debug_level(void); |
c842a3ad JV |
89 | |
90 | static inline const char *ip_vs_dbg_addr(int af, char *buf, size_t buf_len, | |
91 | const union nf_inet_addr *addr, | |
92 | int *idx) | |
93 | { | |
94 | int len; | |
95 | #ifdef CONFIG_IP_VS_IPV6 | |
96 | if (af == AF_INET6) | |
5b095d98 | 97 | len = snprintf(&buf[*idx], buf_len - *idx, "[%pI6]", |
0c6ce78a | 98 | &addr->in6) + 1; |
c842a3ad JV |
99 | else |
100 | #endif | |
3685f25d HH |
101 | len = snprintf(&buf[*idx], buf_len - *idx, "%pI4", |
102 | &addr->ip) + 1; | |
c842a3ad JV |
103 | |
104 | *idx += len; | |
105 | BUG_ON(*idx > buf_len + 1); | |
106 | return &buf[*idx - len]; | |
107 | } | |
108 | ||
9aada7ac HE |
109 | #define IP_VS_DBG_BUF(level, msg, ...) \ |
110 | do { \ | |
111 | char ip_vs_dbg_buf[160]; \ | |
112 | int ip_vs_dbg_idx = 0; \ | |
113 | if (level <= ip_vs_get_debug_level()) \ | |
114 | printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \ | |
115 | } while (0) | |
116 | #define IP_VS_ERR_BUF(msg...) \ | |
117 | do { \ | |
118 | char ip_vs_dbg_buf[160]; \ | |
119 | int ip_vs_dbg_idx = 0; \ | |
120 | pr_err(msg); \ | |
121 | } while (0) | |
c842a3ad JV |
122 | |
123 | /* Only use from within IP_VS_DBG_BUF() or IP_VS_ERR_BUF macros */ | |
9aada7ac HE |
124 | #define IP_VS_DBG_ADDR(af, addr) \ |
125 | ip_vs_dbg_addr(af, ip_vs_dbg_buf, \ | |
126 | sizeof(ip_vs_dbg_buf), addr, \ | |
127 | &ip_vs_dbg_idx) | |
128 | ||
129 | #define IP_VS_DBG(level, msg, ...) \ | |
130 | do { \ | |
131 | if (level <= ip_vs_get_debug_level()) \ | |
132 | printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \ | |
133 | } while (0) | |
134 | #define IP_VS_DBG_RL(msg, ...) \ | |
135 | do { \ | |
136 | if (net_ratelimit()) \ | |
137 | printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \ | |
138 | } while (0) | |
0d79641a | 139 | #define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg) \ |
9aada7ac HE |
140 | do { \ |
141 | if (level <= ip_vs_get_debug_level()) \ | |
0d79641a | 142 | pp->debug_packet(af, pp, skb, ofs, msg); \ |
9aada7ac | 143 | } while (0) |
0d79641a | 144 | #define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) \ |
9aada7ac HE |
145 | do { \ |
146 | if (level <= ip_vs_get_debug_level() && \ | |
147 | net_ratelimit()) \ | |
0d79641a | 148 | pp->debug_packet(af, pp, skb, ofs, msg); \ |
9aada7ac | 149 | } while (0) |
1da177e4 | 150 | #else /* NO DEBUGGING at ALL */ |
c842a3ad JV |
151 | #define IP_VS_DBG_BUF(level, msg...) do {} while (0) |
152 | #define IP_VS_ERR_BUF(msg...) do {} while (0) | |
1da177e4 LT |
153 | #define IP_VS_DBG(level, msg...) do {} while (0) |
154 | #define IP_VS_DBG_RL(msg...) do {} while (0) | |
0d79641a JA |
155 | #define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg) do {} while (0) |
156 | #define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) do {} while (0) | |
1da177e4 LT |
157 | #endif |
158 | ||
159 | #define IP_VS_BUG() BUG() | |
1e3e238e | 160 | #define IP_VS_ERR_RL(msg, ...) \ |
9aada7ac HE |
161 | do { \ |
162 | if (net_ratelimit()) \ | |
1e3e238e | 163 | pr_err(msg, ##__VA_ARGS__); \ |
9aada7ac | 164 | } while (0) |
1da177e4 LT |
165 | |
166 | #ifdef CONFIG_IP_VS_DEBUG | |
167 | #define EnterFunction(level) \ | |
9aada7ac HE |
168 | do { \ |
169 | if (level <= ip_vs_get_debug_level()) \ | |
170 | printk(KERN_DEBUG \ | |
171 | pr_fmt("Enter: %s, %s line %i\n"), \ | |
172 | __func__, __FILE__, __LINE__); \ | |
173 | } while (0) | |
174 | #define LeaveFunction(level) \ | |
175 | do { \ | |
176 | if (level <= ip_vs_get_debug_level()) \ | |
177 | printk(KERN_DEBUG \ | |
178 | pr_fmt("Leave: %s, %s line %i\n"), \ | |
179 | __func__, __FILE__, __LINE__); \ | |
180 | } while (0) | |
1da177e4 LT |
181 | #else |
182 | #define EnterFunction(level) do {} while (0) | |
183 | #define LeaveFunction(level) do {} while (0) | |
184 | #endif | |
185 | ||
186 | #define IP_VS_WAIT_WHILE(expr) while (expr) { cpu_relax(); } | |
187 | ||
188 | ||
189 | /* | |
190 | * The port number of FTP service (in network order). | |
191 | */ | |
f3a7c66b HH |
192 | #define FTPPORT cpu_to_be16(21) |
193 | #define FTPDATA cpu_to_be16(20) | |
1da177e4 | 194 | |
1da177e4 LT |
195 | /* |
196 | * TCP State Values | |
197 | */ | |
198 | enum { | |
199 | IP_VS_TCP_S_NONE = 0, | |
200 | IP_VS_TCP_S_ESTABLISHED, | |
201 | IP_VS_TCP_S_SYN_SENT, | |
202 | IP_VS_TCP_S_SYN_RECV, | |
203 | IP_VS_TCP_S_FIN_WAIT, | |
204 | IP_VS_TCP_S_TIME_WAIT, | |
205 | IP_VS_TCP_S_CLOSE, | |
206 | IP_VS_TCP_S_CLOSE_WAIT, | |
207 | IP_VS_TCP_S_LAST_ACK, | |
208 | IP_VS_TCP_S_LISTEN, | |
209 | IP_VS_TCP_S_SYNACK, | |
210 | IP_VS_TCP_S_LAST | |
211 | }; | |
212 | ||
213 | /* | |
214 | * UDP State Values | |
215 | */ | |
216 | enum { | |
217 | IP_VS_UDP_S_NORMAL, | |
218 | IP_VS_UDP_S_LAST, | |
219 | }; | |
220 | ||
221 | /* | |
222 | * ICMP State Values | |
223 | */ | |
224 | enum { | |
225 | IP_VS_ICMP_S_NORMAL, | |
226 | IP_VS_ICMP_S_LAST, | |
227 | }; | |
228 | ||
2906f66a VMR |
229 | /* |
230 | * SCTP State Values | |
231 | */ | |
232 | enum ip_vs_sctp_states { | |
233 | IP_VS_SCTP_S_NONE, | |
234 | IP_VS_SCTP_S_INIT_CLI, | |
235 | IP_VS_SCTP_S_INIT_SER, | |
236 | IP_VS_SCTP_S_INIT_ACK_CLI, | |
237 | IP_VS_SCTP_S_INIT_ACK_SER, | |
238 | IP_VS_SCTP_S_ECHO_CLI, | |
239 | IP_VS_SCTP_S_ECHO_SER, | |
240 | IP_VS_SCTP_S_ESTABLISHED, | |
241 | IP_VS_SCTP_S_SHUT_CLI, | |
242 | IP_VS_SCTP_S_SHUT_SER, | |
243 | IP_VS_SCTP_S_SHUT_ACK_CLI, | |
244 | IP_VS_SCTP_S_SHUT_ACK_SER, | |
245 | IP_VS_SCTP_S_CLOSED, | |
246 | IP_VS_SCTP_S_LAST | |
247 | }; | |
248 | ||
1da177e4 LT |
249 | /* |
250 | * Delta sequence info structure | |
251 | * Each ip_vs_conn has 2 (output AND input seq. changes). | |
252 | * Only used in the VS/NAT. | |
253 | */ | |
254 | struct ip_vs_seq { | |
255 | __u32 init_seq; /* Add delta from this seq */ | |
256 | __u32 delta; /* Delta in sequence numbers */ | |
257 | __u32 previous_delta; /* Delta in sequence numbers | |
258 | before last resized pkt */ | |
259 | }; | |
260 | ||
261 | ||
262 | /* | |
3a14a313 | 263 | * IPVS statistics objects |
1da177e4 | 264 | */ |
3a14a313 SW |
265 | struct ip_vs_estimator { |
266 | struct list_head list; | |
267 | ||
268 | u64 last_inbytes; | |
269 | u64 last_outbytes; | |
270 | u32 last_conns; | |
271 | u32 last_inpkts; | |
272 | u32 last_outpkts; | |
273 | ||
274 | u32 cps; | |
275 | u32 inpps; | |
276 | u32 outpps; | |
277 | u32 inbps; | |
278 | u32 outbps; | |
279 | }; | |
280 | ||
fd2c3ef7 | 281 | struct ip_vs_stats { |
e9c0ce23 SW |
282 | struct ip_vs_stats_user ustats; /* statistics */ |
283 | struct ip_vs_estimator est; /* estimator */ | |
3a14a313 | 284 | |
1da177e4 LT |
285 | spinlock_t lock; /* spin lock */ |
286 | }; | |
287 | ||
14c85021 ACM |
288 | struct dst_entry; |
289 | struct iphdr; | |
1da177e4 LT |
290 | struct ip_vs_conn; |
291 | struct ip_vs_app; | |
14c85021 | 292 | struct sk_buff; |
1da177e4 LT |
293 | |
294 | struct ip_vs_protocol { | |
295 | struct ip_vs_protocol *next; | |
296 | char *name; | |
2ad17def JA |
297 | u16 protocol; |
298 | u16 num_states; | |
1da177e4 LT |
299 | int dont_defrag; |
300 | atomic_t appcnt; /* counter of proto app incs */ | |
301 | int *timeout_table; /* protocol timeout table */ | |
302 | ||
303 | void (*init)(struct ip_vs_protocol *pp); | |
304 | ||
305 | void (*exit)(struct ip_vs_protocol *pp); | |
306 | ||
51ef348b | 307 | int (*conn_schedule)(int af, struct sk_buff *skb, |
1da177e4 LT |
308 | struct ip_vs_protocol *pp, |
309 | int *verdict, struct ip_vs_conn **cpp); | |
310 | ||
311 | struct ip_vs_conn * | |
51ef348b JV |
312 | (*conn_in_get)(int af, |
313 | const struct sk_buff *skb, | |
1da177e4 | 314 | struct ip_vs_protocol *pp, |
51ef348b | 315 | const struct ip_vs_iphdr *iph, |
1da177e4 LT |
316 | unsigned int proto_off, |
317 | int inverse); | |
318 | ||
319 | struct ip_vs_conn * | |
51ef348b JV |
320 | (*conn_out_get)(int af, |
321 | const struct sk_buff *skb, | |
1da177e4 | 322 | struct ip_vs_protocol *pp, |
51ef348b | 323 | const struct ip_vs_iphdr *iph, |
1da177e4 LT |
324 | unsigned int proto_off, |
325 | int inverse); | |
326 | ||
3db05fea | 327 | int (*snat_handler)(struct sk_buff *skb, |
1da177e4 LT |
328 | struct ip_vs_protocol *pp, struct ip_vs_conn *cp); |
329 | ||
3db05fea | 330 | int (*dnat_handler)(struct sk_buff *skb, |
1da177e4 LT |
331 | struct ip_vs_protocol *pp, struct ip_vs_conn *cp); |
332 | ||
51ef348b JV |
333 | int (*csum_check)(int af, struct sk_buff *skb, |
334 | struct ip_vs_protocol *pp); | |
1da177e4 LT |
335 | |
336 | const char *(*state_name)(int state); | |
337 | ||
338 | int (*state_transition)(struct ip_vs_conn *cp, int direction, | |
339 | const struct sk_buff *skb, | |
340 | struct ip_vs_protocol *pp); | |
341 | ||
342 | int (*register_app)(struct ip_vs_app *inc); | |
343 | ||
344 | void (*unregister_app)(struct ip_vs_app *inc); | |
345 | ||
346 | int (*app_conn_bind)(struct ip_vs_conn *cp); | |
347 | ||
0d79641a | 348 | void (*debug_packet)(int af, struct ip_vs_protocol *pp, |
1da177e4 LT |
349 | const struct sk_buff *skb, |
350 | int offset, | |
351 | const char *msg); | |
352 | ||
353 | void (*timeout_change)(struct ip_vs_protocol *pp, int flags); | |
354 | ||
355 | int (*set_state_timeout)(struct ip_vs_protocol *pp, char *sname, int to); | |
356 | }; | |
357 | ||
358 | extern struct ip_vs_protocol * ip_vs_proto_get(unsigned short proto); | |
359 | ||
f11017ec SH |
360 | struct ip_vs_conn_param { |
361 | const union nf_inet_addr *caddr; | |
362 | const union nf_inet_addr *vaddr; | |
363 | __be16 cport; | |
364 | __be16 vport; | |
365 | __u16 protocol; | |
366 | u16 af; | |
85999283 SH |
367 | |
368 | const struct ip_vs_pe *pe; | |
369 | char *pe_data; | |
370 | __u8 pe_data_len; | |
f11017ec SH |
371 | }; |
372 | ||
1da177e4 LT |
373 | /* |
374 | * IP_VS structure allocated for each dynamically scheduled connection | |
375 | */ | |
376 | struct ip_vs_conn { | |
377 | struct list_head c_list; /* hashed list heads */ | |
378 | ||
379 | /* Protocol, addresses and port numbers */ | |
e7ade46a JV |
380 | u16 af; /* address family */ |
381 | union nf_inet_addr caddr; /* client address */ | |
382 | union nf_inet_addr vaddr; /* virtual address */ | |
383 | union nf_inet_addr daddr; /* destination address */ | |
3575792e | 384 | volatile __u32 flags; /* status flags */ |
014d730d AV |
385 | __be16 cport; |
386 | __be16 vport; | |
387 | __be16 dport; | |
1da177e4 LT |
388 | __u16 protocol; /* Which protocol (TCP/UDP) */ |
389 | ||
390 | /* counter and timer */ | |
391 | atomic_t refcnt; /* reference count */ | |
392 | struct timer_list timer; /* Expiration timer */ | |
393 | volatile unsigned long timeout; /* timeout */ | |
394 | ||
395 | /* Flags and state transition */ | |
396 | spinlock_t lock; /* lock for state transition */ | |
1da177e4 | 397 | volatile __u16 state; /* state info */ |
efac5276 RB |
398 | volatile __u16 old_state; /* old state, to be used for |
399 | * state transition triggerd | |
400 | * synchronization | |
401 | */ | |
1da177e4 LT |
402 | |
403 | /* Control members */ | |
404 | struct ip_vs_conn *control; /* Master control connection */ | |
405 | atomic_t n_control; /* Number of controlled ones */ | |
406 | struct ip_vs_dest *dest; /* real server */ | |
407 | atomic_t in_pkts; /* incoming packet counter */ | |
408 | ||
409 | /* packet transmitter for different forwarding methods. If it | |
410 | mangles the packet, it must return NF_DROP or better NF_STOLEN, | |
411 | otherwise this must be changed to a sk_buff **. | |
fc604767 | 412 | NF_ACCEPT can be returned when destination is local. |
1da177e4 LT |
413 | */ |
414 | int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp, | |
415 | struct ip_vs_protocol *pp); | |
416 | ||
417 | /* Note: we can group the following members into a structure, | |
418 | in order to save more space, and the following members are | |
419 | only used in VS/NAT anyway */ | |
420 | struct ip_vs_app *app; /* bound ip_vs_app object */ | |
421 | void *app_data; /* Application private data */ | |
422 | struct ip_vs_seq in_seq; /* incoming seq. struct */ | |
423 | struct ip_vs_seq out_seq; /* outgoing seq. struct */ | |
85999283 SH |
424 | |
425 | char *pe_data; | |
426 | __u8 pe_data_len; | |
1da177e4 LT |
427 | }; |
428 | ||
429 | ||
c860c6b1 JV |
430 | /* |
431 | * Extended internal versions of struct ip_vs_service_user and | |
432 | * ip_vs_dest_user for IPv6 support. | |
433 | * | |
434 | * We need these to conveniently pass around service and destination | |
435 | * options, but unfortunately, we also need to keep the old definitions to | |
436 | * maintain userspace backwards compatibility for the setsockopt interface. | |
437 | */ | |
438 | struct ip_vs_service_user_kern { | |
439 | /* virtual service addresses */ | |
440 | u16 af; | |
441 | u16 protocol; | |
442 | union nf_inet_addr addr; /* virtual ip address */ | |
443 | u16 port; | |
444 | u32 fwmark; /* firwall mark of service */ | |
445 | ||
446 | /* virtual service options */ | |
447 | char *sched_name; | |
0d1e71b0 | 448 | char *pe_name; |
c860c6b1 JV |
449 | unsigned flags; /* virtual service flags */ |
450 | unsigned timeout; /* persistent timeout in sec */ | |
451 | u32 netmask; /* persistent netmask */ | |
452 | }; | |
453 | ||
454 | ||
455 | struct ip_vs_dest_user_kern { | |
456 | /* destination server address */ | |
457 | union nf_inet_addr addr; | |
458 | u16 port; | |
459 | ||
460 | /* real server options */ | |
461 | unsigned conn_flags; /* connection flags */ | |
462 | int weight; /* destination weight */ | |
463 | ||
464 | /* thresholds for active connections */ | |
465 | u32 u_threshold; /* upper threshold */ | |
466 | u32 l_threshold; /* lower threshold */ | |
467 | }; | |
468 | ||
469 | ||
1da177e4 LT |
470 | /* |
471 | * The information about the virtual service offered to the net | |
472 | * and the forwarding entries | |
473 | */ | |
474 | struct ip_vs_service { | |
475 | struct list_head s_list; /* for normal service table */ | |
476 | struct list_head f_list; /* for fwmark-based service table */ | |
477 | atomic_t refcnt; /* reference counter */ | |
478 | atomic_t usecnt; /* use counter */ | |
479 | ||
e7ade46a | 480 | u16 af; /* address family */ |
1da177e4 | 481 | __u16 protocol; /* which protocol (TCP/UDP) */ |
e7ade46a | 482 | union nf_inet_addr addr; /* IP address for virtual service */ |
014d730d | 483 | __be16 port; /* port number for the service */ |
1da177e4 LT |
484 | __u32 fwmark; /* firewall mark of the service */ |
485 | unsigned flags; /* service status flags */ | |
486 | unsigned timeout; /* persistent timeout in ticks */ | |
014d730d | 487 | __be32 netmask; /* grouping granularity */ |
1da177e4 LT |
488 | |
489 | struct list_head destinations; /* real server d-linked list */ | |
490 | __u32 num_dests; /* number of servers */ | |
491 | struct ip_vs_stats stats; /* statistics for the service */ | |
492 | struct ip_vs_app *inc; /* bind conns to this app inc */ | |
493 | ||
494 | /* for scheduling */ | |
495 | struct ip_vs_scheduler *scheduler; /* bound scheduler object */ | |
496 | rwlock_t sched_lock; /* lock sched_data */ | |
497 | void *sched_data; /* scheduler application data */ | |
85999283 SH |
498 | |
499 | /* alternate persistence engine */ | |
500 | struct ip_vs_pe *pe; | |
1da177e4 LT |
501 | }; |
502 | ||
503 | ||
504 | /* | |
505 | * The real server destination forwarding entry | |
506 | * with ip address, port number, and so on. | |
507 | */ | |
508 | struct ip_vs_dest { | |
509 | struct list_head n_list; /* for the dests in the service */ | |
510 | struct list_head d_list; /* for table with all the dests */ | |
511 | ||
e7ade46a JV |
512 | u16 af; /* address family */ |
513 | union nf_inet_addr addr; /* IP address of the server */ | |
014d730d | 514 | __be16 port; /* port number of the server */ |
1da177e4 LT |
515 | volatile unsigned flags; /* dest status flags */ |
516 | atomic_t conn_flags; /* flags to copy to conn */ | |
517 | atomic_t weight; /* server weight */ | |
518 | ||
519 | atomic_t refcnt; /* reference counter */ | |
520 | struct ip_vs_stats stats; /* statistics */ | |
521 | ||
522 | /* connection counters and thresholds */ | |
523 | atomic_t activeconns; /* active connections */ | |
524 | atomic_t inactconns; /* inactive connections */ | |
525 | atomic_t persistconns; /* persistent connections */ | |
526 | __u32 u_threshold; /* upper threshold */ | |
527 | __u32 l_threshold; /* lower threshold */ | |
528 | ||
529 | /* for destination cache */ | |
530 | spinlock_t dst_lock; /* lock of dst_cache */ | |
531 | struct dst_entry *dst_cache; /* destination cache entry */ | |
532 | u32 dst_rtos; /* RT_TOS(tos) for dst */ | |
714f095f HS |
533 | u32 dst_cookie; |
534 | #ifdef CONFIG_IP_VS_IPV6 | |
535 | struct in6_addr dst_saddr; | |
536 | #endif | |
1da177e4 LT |
537 | |
538 | /* for virtual service */ | |
539 | struct ip_vs_service *svc; /* service it belongs to */ | |
540 | __u16 protocol; /* which protocol (TCP/UDP) */ | |
e7ade46a | 541 | union nf_inet_addr vaddr; /* virtual IP address */ |
014d730d | 542 | __be16 vport; /* virtual port number */ |
1da177e4 LT |
543 | __u32 vfwmark; /* firewall mark of service */ |
544 | }; | |
545 | ||
546 | ||
547 | /* | |
548 | * The scheduler object | |
549 | */ | |
550 | struct ip_vs_scheduler { | |
551 | struct list_head n_list; /* d-linked list head */ | |
552 | char *name; /* scheduler name */ | |
553 | atomic_t refcnt; /* reference counter */ | |
554 | struct module *module; /* THIS_MODULE/NULL */ | |
555 | ||
556 | /* scheduler initializing service */ | |
557 | int (*init_service)(struct ip_vs_service *svc); | |
558 | /* scheduling service finish */ | |
559 | int (*done_service)(struct ip_vs_service *svc); | |
560 | /* scheduler updating service */ | |
561 | int (*update_service)(struct ip_vs_service *svc); | |
562 | ||
563 | /* selecting a server from the given service */ | |
564 | struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc, | |
565 | const struct sk_buff *skb); | |
566 | }; | |
567 | ||
85999283 SH |
568 | /* The persistence engine object */ |
569 | struct ip_vs_pe { | |
570 | struct list_head n_list; /* d-linked list head */ | |
571 | char *name; /* scheduler name */ | |
572 | atomic_t refcnt; /* reference counter */ | |
573 | struct module *module; /* THIS_MODULE/NULL */ | |
574 | ||
575 | /* get the connection template, if any */ | |
576 | int (*fill_param)(struct ip_vs_conn_param *p, struct sk_buff *skb); | |
577 | bool (*ct_match)(const struct ip_vs_conn_param *p, | |
578 | struct ip_vs_conn *ct); | |
579 | u32 (*hashkey_raw)(const struct ip_vs_conn_param *p, u32 initval, | |
580 | bool inverse); | |
a3c918ac | 581 | int (*show_pe_data)(const struct ip_vs_conn *cp, char *buf); |
85999283 | 582 | }; |
1da177e4 LT |
583 | |
584 | /* | |
585 | * The application module object (a.k.a. app incarnation) | |
586 | */ | |
fd2c3ef7 | 587 | struct ip_vs_app { |
1da177e4 LT |
588 | struct list_head a_list; /* member in app list */ |
589 | int type; /* IP_VS_APP_TYPE_xxx */ | |
590 | char *name; /* application module name */ | |
591 | __u16 protocol; | |
592 | struct module *module; /* THIS_MODULE/NULL */ | |
593 | struct list_head incs_list; /* list of incarnations */ | |
594 | ||
595 | /* members for application incarnations */ | |
596 | struct list_head p_list; /* member in proto app list */ | |
597 | struct ip_vs_app *app; /* its real application */ | |
014d730d | 598 | __be16 port; /* port number in net order */ |
1da177e4 LT |
599 | atomic_t usecnt; /* usage counter */ |
600 | ||
8b27b10f JA |
601 | /* |
602 | * output hook: Process packet in inout direction, diff set for TCP. | |
603 | * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok, | |
604 | * 2=Mangled but checksum was not updated | |
605 | */ | |
1da177e4 | 606 | int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *, |
3db05fea | 607 | struct sk_buff *, int *diff); |
1da177e4 | 608 | |
8b27b10f JA |
609 | /* |
610 | * input hook: Process packet in outin direction, diff set for TCP. | |
611 | * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok, | |
612 | * 2=Mangled but checksum was not updated | |
613 | */ | |
1da177e4 | 614 | int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *, |
3db05fea | 615 | struct sk_buff *, int *diff); |
1da177e4 LT |
616 | |
617 | /* ip_vs_app initializer */ | |
618 | int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *); | |
619 | ||
620 | /* ip_vs_app finish */ | |
621 | int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *); | |
622 | ||
623 | ||
624 | /* not used now */ | |
625 | int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *, | |
626 | struct ip_vs_protocol *); | |
627 | ||
628 | void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *); | |
629 | ||
630 | int * timeout_table; | |
631 | int * timeouts; | |
632 | int timeouts_size; | |
633 | ||
634 | int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app, | |
635 | int *verdict, struct ip_vs_conn **cpp); | |
636 | ||
637 | struct ip_vs_conn * | |
638 | (*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app, | |
639 | const struct iphdr *iph, unsigned int proto_off, | |
640 | int inverse); | |
641 | ||
642 | struct ip_vs_conn * | |
643 | (*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app, | |
644 | const struct iphdr *iph, unsigned int proto_off, | |
645 | int inverse); | |
646 | ||
647 | int (*state_transition)(struct ip_vs_conn *cp, int direction, | |
648 | const struct sk_buff *skb, | |
649 | struct ip_vs_app *app); | |
650 | ||
651 | void (*timeout_change)(struct ip_vs_app *app, int flags); | |
652 | }; | |
653 | ||
654 | ||
655 | /* | |
656 | * IPVS core functions | |
657 | * (from ip_vs_core.c) | |
658 | */ | |
659 | extern const char *ip_vs_proto_name(unsigned proto); | |
660 | extern void ip_vs_init_hash_table(struct list_head *table, int rows); | |
afdd6140 | 661 | #define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table((t), ARRAY_SIZE((t))) |
1da177e4 | 662 | |
1da177e4 LT |
663 | #define IP_VS_APP_TYPE_FTP 1 |
664 | ||
665 | /* | |
666 | * ip_vs_conn handling functions | |
667 | * (from ip_vs_conn.c) | |
668 | */ | |
669 | ||
1da177e4 LT |
670 | enum { |
671 | IP_VS_DIR_INPUT = 0, | |
672 | IP_VS_DIR_OUTPUT, | |
673 | IP_VS_DIR_INPUT_ONLY, | |
674 | IP_VS_DIR_LAST, | |
675 | }; | |
676 | ||
f11017ec SH |
677 | static inline void ip_vs_conn_fill_param(int af, int protocol, |
678 | const union nf_inet_addr *caddr, | |
679 | __be16 cport, | |
680 | const union nf_inet_addr *vaddr, | |
681 | __be16 vport, | |
682 | struct ip_vs_conn_param *p) | |
683 | { | |
684 | p->af = af; | |
685 | p->protocol = protocol; | |
686 | p->caddr = caddr; | |
687 | p->cport = cport; | |
688 | p->vaddr = vaddr; | |
689 | p->vport = vport; | |
85999283 SH |
690 | p->pe = NULL; |
691 | p->pe_data = NULL; | |
f11017ec | 692 | } |
28364a59 | 693 | |
f11017ec SH |
694 | struct ip_vs_conn *ip_vs_conn_in_get(const struct ip_vs_conn_param *p); |
695 | struct ip_vs_conn *ip_vs_ct_in_get(const struct ip_vs_conn_param *p); | |
28364a59 | 696 | |
5c0d2374 SH |
697 | struct ip_vs_conn * ip_vs_conn_in_get_proto(int af, const struct sk_buff *skb, |
698 | struct ip_vs_protocol *pp, | |
699 | const struct ip_vs_iphdr *iph, | |
700 | unsigned int proto_off, | |
701 | int inverse); | |
702 | ||
f11017ec | 703 | struct ip_vs_conn *ip_vs_conn_out_get(const struct ip_vs_conn_param *p); |
1da177e4 | 704 | |
5c0d2374 SH |
705 | struct ip_vs_conn * ip_vs_conn_out_get_proto(int af, const struct sk_buff *skb, |
706 | struct ip_vs_protocol *pp, | |
707 | const struct ip_vs_iphdr *iph, | |
708 | unsigned int proto_off, | |
709 | int inverse); | |
710 | ||
1da177e4 LT |
711 | /* put back the conn without restarting its timer */ |
712 | static inline void __ip_vs_conn_put(struct ip_vs_conn *cp) | |
713 | { | |
714 | atomic_dec(&cp->refcnt); | |
715 | } | |
716 | extern void ip_vs_conn_put(struct ip_vs_conn *cp); | |
014d730d | 717 | extern void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport); |
1da177e4 | 718 | |
f11017ec SH |
719 | struct ip_vs_conn *ip_vs_conn_new(const struct ip_vs_conn_param *p, |
720 | const union nf_inet_addr *daddr, | |
721 | __be16 dport, unsigned flags, | |
722 | struct ip_vs_dest *dest); | |
1da177e4 LT |
723 | extern void ip_vs_conn_expire_now(struct ip_vs_conn *cp); |
724 | ||
725 | extern const char * ip_vs_state_name(__u16 proto, int state); | |
726 | ||
727 | extern void ip_vs_tcp_conn_listen(struct ip_vs_conn *cp); | |
728 | extern int ip_vs_check_template(struct ip_vs_conn *ct); | |
1da177e4 LT |
729 | extern void ip_vs_random_dropentry(void); |
730 | extern int ip_vs_conn_init(void); | |
731 | extern void ip_vs_conn_cleanup(void); | |
732 | ||
733 | static inline void ip_vs_control_del(struct ip_vs_conn *cp) | |
734 | { | |
735 | struct ip_vs_conn *ctl_cp = cp->control; | |
736 | if (!ctl_cp) { | |
cfc78c5a JV |
737 | IP_VS_ERR_BUF("request control DEL for uncontrolled: " |
738 | "%s:%d to %s:%d\n", | |
739 | IP_VS_DBG_ADDR(cp->af, &cp->caddr), | |
740 | ntohs(cp->cport), | |
741 | IP_VS_DBG_ADDR(cp->af, &cp->vaddr), | |
742 | ntohs(cp->vport)); | |
743 | ||
1da177e4 LT |
744 | return; |
745 | } | |
746 | ||
cfc78c5a JV |
747 | IP_VS_DBG_BUF(7, "DELeting control for: " |
748 | "cp.dst=%s:%d ctl_cp.dst=%s:%d\n", | |
749 | IP_VS_DBG_ADDR(cp->af, &cp->caddr), | |
750 | ntohs(cp->cport), | |
751 | IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr), | |
752 | ntohs(ctl_cp->cport)); | |
1da177e4 LT |
753 | |
754 | cp->control = NULL; | |
755 | if (atomic_read(&ctl_cp->n_control) == 0) { | |
cfc78c5a JV |
756 | IP_VS_ERR_BUF("BUG control DEL with n=0 : " |
757 | "%s:%d to %s:%d\n", | |
758 | IP_VS_DBG_ADDR(cp->af, &cp->caddr), | |
759 | ntohs(cp->cport), | |
760 | IP_VS_DBG_ADDR(cp->af, &cp->vaddr), | |
761 | ntohs(cp->vport)); | |
762 | ||
1da177e4 LT |
763 | return; |
764 | } | |
765 | atomic_dec(&ctl_cp->n_control); | |
766 | } | |
767 | ||
768 | static inline void | |
769 | ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp) | |
770 | { | |
771 | if (cp->control) { | |
cfc78c5a JV |
772 | IP_VS_ERR_BUF("request control ADD for already controlled: " |
773 | "%s:%d to %s:%d\n", | |
774 | IP_VS_DBG_ADDR(cp->af, &cp->caddr), | |
775 | ntohs(cp->cport), | |
776 | IP_VS_DBG_ADDR(cp->af, &cp->vaddr), | |
777 | ntohs(cp->vport)); | |
778 | ||
1da177e4 LT |
779 | ip_vs_control_del(cp); |
780 | } | |
781 | ||
cfc78c5a JV |
782 | IP_VS_DBG_BUF(7, "ADDing control for: " |
783 | "cp.dst=%s:%d ctl_cp.dst=%s:%d\n", | |
784 | IP_VS_DBG_ADDR(cp->af, &cp->caddr), | |
785 | ntohs(cp->cport), | |
786 | IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr), | |
787 | ntohs(ctl_cp->cport)); | |
1da177e4 LT |
788 | |
789 | cp->control = ctl_cp; | |
790 | atomic_inc(&ctl_cp->n_control); | |
791 | } | |
792 | ||
793 | ||
794 | /* | |
795 | * IPVS application functions | |
796 | * (from ip_vs_app.c) | |
797 | */ | |
798 | #define IP_VS_APP_MAX_PORTS 8 | |
799 | extern int register_ip_vs_app(struct ip_vs_app *app); | |
800 | extern void unregister_ip_vs_app(struct ip_vs_app *app); | |
801 | extern int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp); | |
802 | extern void ip_vs_unbind_app(struct ip_vs_conn *cp); | |
803 | extern int | |
804 | register_ip_vs_app_inc(struct ip_vs_app *app, __u16 proto, __u16 port); | |
805 | extern int ip_vs_app_inc_get(struct ip_vs_app *inc); | |
806 | extern void ip_vs_app_inc_put(struct ip_vs_app *inc); | |
807 | ||
3db05fea HX |
808 | extern int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb); |
809 | extern int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb); | |
1da177e4 LT |
810 | extern int ip_vs_app_init(void); |
811 | extern void ip_vs_app_cleanup(void); | |
812 | ||
8be67a66 SH |
813 | void ip_vs_bind_pe(struct ip_vs_service *svc, struct ip_vs_pe *pe); |
814 | void ip_vs_unbind_pe(struct ip_vs_service *svc); | |
815 | int register_ip_vs_pe(struct ip_vs_pe *pe); | |
816 | int unregister_ip_vs_pe(struct ip_vs_pe *pe); | |
817 | extern struct ip_vs_pe *ip_vs_pe_get(const char *name); | |
818 | extern void ip_vs_pe_put(struct ip_vs_pe *pe); | |
1da177e4 LT |
819 | |
820 | /* | |
821 | * IPVS protocol functions (from ip_vs_proto.c) | |
822 | */ | |
823 | extern int ip_vs_protocol_init(void); | |
824 | extern void ip_vs_protocol_cleanup(void); | |
825 | extern void ip_vs_protocol_timeout_change(int flags); | |
826 | extern int *ip_vs_create_timeout_table(int *table, int size); | |
827 | extern int | |
36cbd3dc JE |
828 | ip_vs_set_state_timeout(int *table, int num, const char *const *names, |
829 | const char *name, int to); | |
1da177e4 | 830 | extern void |
0d79641a JA |
831 | ip_vs_tcpudp_debug_packet(int af, struct ip_vs_protocol *pp, |
832 | const struct sk_buff *skb, | |
1da177e4 LT |
833 | int offset, const char *msg); |
834 | ||
835 | extern struct ip_vs_protocol ip_vs_protocol_tcp; | |
836 | extern struct ip_vs_protocol ip_vs_protocol_udp; | |
837 | extern struct ip_vs_protocol ip_vs_protocol_icmp; | |
838 | extern struct ip_vs_protocol ip_vs_protocol_esp; | |
839 | extern struct ip_vs_protocol ip_vs_protocol_ah; | |
2906f66a | 840 | extern struct ip_vs_protocol ip_vs_protocol_sctp; |
1da177e4 LT |
841 | |
842 | /* | |
843 | * Registering/unregistering scheduler functions | |
844 | * (from ip_vs_sched.c) | |
845 | */ | |
846 | extern int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler); | |
847 | extern int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler); | |
848 | extern int ip_vs_bind_scheduler(struct ip_vs_service *svc, | |
849 | struct ip_vs_scheduler *scheduler); | |
850 | extern int ip_vs_unbind_scheduler(struct ip_vs_service *svc); | |
851 | extern struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name); | |
852 | extern void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler); | |
853 | extern struct ip_vs_conn * | |
190ecd27 JA |
854 | ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb, |
855 | struct ip_vs_protocol *pp, int *ignored); | |
1da177e4 LT |
856 | extern int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb, |
857 | struct ip_vs_protocol *pp); | |
858 | ||
859 | ||
860 | /* | |
861 | * IPVS control data and functions (from ip_vs_ctl.c) | |
862 | */ | |
863 | extern int sysctl_ip_vs_cache_bypass; | |
864 | extern int sysctl_ip_vs_expire_nodest_conn; | |
865 | extern int sysctl_ip_vs_expire_quiescent_template; | |
866 | extern int sysctl_ip_vs_sync_threshold[2]; | |
867 | extern int sysctl_ip_vs_nat_icmp_send; | |
f4bc17cd | 868 | extern int sysctl_ip_vs_conntrack; |
8a803040 | 869 | extern int sysctl_ip_vs_snat_reroute; |
1da177e4 | 870 | extern struct ip_vs_stats ip_vs_stats; |
5587da55 | 871 | extern const struct ctl_path net_vs_ctl_path[]; |
1da177e4 LT |
872 | |
873 | extern struct ip_vs_service * | |
3c2e0505 JV |
874 | ip_vs_service_get(int af, __u32 fwmark, __u16 protocol, |
875 | const union nf_inet_addr *vaddr, __be16 vport); | |
1da177e4 LT |
876 | |
877 | static inline void ip_vs_service_put(struct ip_vs_service *svc) | |
878 | { | |
879 | atomic_dec(&svc->usecnt); | |
880 | } | |
881 | ||
882 | extern struct ip_vs_dest * | |
7937df15 JV |
883 | ip_vs_lookup_real_service(int af, __u16 protocol, |
884 | const union nf_inet_addr *daddr, __be16 dport); | |
885 | ||
1da177e4 LT |
886 | extern int ip_vs_use_count_inc(void); |
887 | extern void ip_vs_use_count_dec(void); | |
888 | extern int ip_vs_control_init(void); | |
889 | extern void ip_vs_control_cleanup(void); | |
1e356f9c | 890 | extern struct ip_vs_dest * |
7937df15 JV |
891 | ip_vs_find_dest(int af, const union nf_inet_addr *daddr, __be16 dport, |
892 | const union nf_inet_addr *vaddr, __be16 vport, __u16 protocol); | |
1e356f9c | 893 | extern struct ip_vs_dest *ip_vs_try_bind_dest(struct ip_vs_conn *cp); |
1da177e4 LT |
894 | |
895 | ||
896 | /* | |
897 | * IPVS sync daemon data and function prototypes | |
898 | * (from ip_vs_sync.c) | |
899 | */ | |
900 | extern volatile int ip_vs_sync_state; | |
901 | extern volatile int ip_vs_master_syncid; | |
902 | extern volatile int ip_vs_backup_syncid; | |
903 | extern char ip_vs_master_mcast_ifn[IP_VS_IFNAME_MAXLEN]; | |
904 | extern char ip_vs_backup_mcast_ifn[IP_VS_IFNAME_MAXLEN]; | |
905 | extern int start_sync_thread(int state, char *mcast_ifn, __u8 syncid); | |
906 | extern int stop_sync_thread(int state); | |
907 | extern void ip_vs_sync_conn(struct ip_vs_conn *cp); | |
908 | ||
909 | ||
910 | /* | |
911 | * IPVS rate estimator prototypes (from ip_vs_est.c) | |
912 | */ | |
a919cf4b SW |
913 | extern int ip_vs_estimator_init(void); |
914 | extern void ip_vs_estimator_cleanup(void); | |
3a14a313 | 915 | extern void ip_vs_new_estimator(struct ip_vs_stats *stats); |
1da177e4 LT |
916 | extern void ip_vs_kill_estimator(struct ip_vs_stats *stats); |
917 | extern void ip_vs_zero_estimator(struct ip_vs_stats *stats); | |
918 | ||
919 | /* | |
920 | * Various IPVS packet transmitters (from ip_vs_xmit.c) | |
921 | */ | |
922 | extern int ip_vs_null_xmit | |
923 | (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); | |
924 | extern int ip_vs_bypass_xmit | |
925 | (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); | |
926 | extern int ip_vs_nat_xmit | |
927 | (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); | |
928 | extern int ip_vs_tunnel_xmit | |
929 | (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); | |
930 | extern int ip_vs_dr_xmit | |
931 | (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); | |
932 | extern int ip_vs_icmp_xmit | |
933 | (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp, int offset); | |
934 | extern void ip_vs_dst_reset(struct ip_vs_dest *dest); | |
935 | ||
b3cdd2a7 JV |
936 | #ifdef CONFIG_IP_VS_IPV6 |
937 | extern int ip_vs_bypass_xmit_v6 | |
938 | (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); | |
939 | extern int ip_vs_nat_xmit_v6 | |
940 | (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); | |
941 | extern int ip_vs_tunnel_xmit_v6 | |
942 | (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); | |
943 | extern int ip_vs_dr_xmit_v6 | |
944 | (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); | |
945 | extern int ip_vs_icmp_xmit_v6 | |
946 | (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp, | |
947 | int offset); | |
948 | #endif | |
1da177e4 LT |
949 | |
950 | /* | |
951 | * This is a simple mechanism to ignore packets when | |
952 | * we are loaded. Just set ip_vs_drop_rate to 'n' and | |
953 | * we start to drop 1/rate of the packets | |
954 | */ | |
955 | extern int ip_vs_drop_rate; | |
956 | extern int ip_vs_drop_counter; | |
957 | ||
958 | static __inline__ int ip_vs_todrop(void) | |
959 | { | |
960 | if (!ip_vs_drop_rate) return 0; | |
961 | if (--ip_vs_drop_counter > 0) return 0; | |
962 | ip_vs_drop_counter = ip_vs_drop_rate; | |
963 | return 1; | |
964 | } | |
965 | ||
966 | /* | |
967 | * ip_vs_fwd_tag returns the forwarding tag of the connection | |
968 | */ | |
969 | #define IP_VS_FWD_METHOD(cp) (cp->flags & IP_VS_CONN_F_FWD_MASK) | |
970 | ||
732db659 | 971 | static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp) |
1da177e4 LT |
972 | { |
973 | char fwd; | |
974 | ||
975 | switch (IP_VS_FWD_METHOD(cp)) { | |
976 | case IP_VS_CONN_F_MASQ: | |
977 | fwd = 'M'; break; | |
978 | case IP_VS_CONN_F_LOCALNODE: | |
979 | fwd = 'L'; break; | |
980 | case IP_VS_CONN_F_TUNNEL: | |
981 | fwd = 'T'; break; | |
982 | case IP_VS_CONN_F_DROUTE: | |
983 | fwd = 'R'; break; | |
984 | case IP_VS_CONN_F_BYPASS: | |
985 | fwd = 'B'; break; | |
986 | default: | |
987 | fwd = '?'; break; | |
988 | } | |
989 | return fwd; | |
990 | } | |
991 | ||
1da177e4 | 992 | extern void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp, |
b3cdd2a7 JV |
993 | struct ip_vs_conn *cp, int dir); |
994 | ||
995 | #ifdef CONFIG_IP_VS_IPV6 | |
996 | extern void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp, | |
997 | struct ip_vs_conn *cp, int dir); | |
998 | #endif | |
1da177e4 | 999 | |
b1550f22 | 1000 | extern __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset); |
1da177e4 | 1001 | |
f9214b26 | 1002 | static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum) |
1da177e4 | 1003 | { |
f9214b26 | 1004 | __be32 diff[2] = { ~old, new }; |
1da177e4 | 1005 | |
07f0757a | 1006 | return csum_partial(diff, sizeof(diff), oldsum); |
f9214b26 AV |
1007 | } |
1008 | ||
0bbdd42b JV |
1009 | #ifdef CONFIG_IP_VS_IPV6 |
1010 | static inline __wsum ip_vs_check_diff16(const __be32 *old, const __be32 *new, | |
1011 | __wsum oldsum) | |
1012 | { | |
1013 | __be32 diff[8] = { ~old[3], ~old[2], ~old[1], ~old[0], | |
1014 | new[3], new[2], new[1], new[0] }; | |
1015 | ||
07f0757a | 1016 | return csum_partial(diff, sizeof(diff), oldsum); |
0bbdd42b JV |
1017 | } |
1018 | #endif | |
1019 | ||
f9214b26 AV |
1020 | static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum) |
1021 | { | |
1022 | __be16 diff[2] = { ~old, new }; | |
1023 | ||
07f0757a | 1024 | return csum_partial(diff, sizeof(diff), oldsum); |
1da177e4 LT |
1025 | } |
1026 | ||
cf356d69 JA |
1027 | /* |
1028 | * Forget current conntrack (unconfirmed) and attach notrack entry | |
1029 | */ | |
1030 | static inline void ip_vs_notrack(struct sk_buff *skb) | |
1031 | { | |
1032 | #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) | |
1033 | enum ip_conntrack_info ctinfo; | |
1034 | struct nf_conn *ct = ct = nf_ct_get(skb, &ctinfo); | |
1035 | ||
1036 | if (!ct || !nf_ct_is_untracked(ct)) { | |
1037 | nf_reset(skb); | |
1038 | skb->nfct = &nf_ct_untracked_get()->ct_general; | |
1039 | skb->nfctinfo = IP_CT_NEW; | |
1040 | nf_conntrack_get(skb->nfct); | |
1041 | } | |
1042 | #endif | |
1043 | } | |
1044 | ||
f4bc17cd JA |
1045 | #ifdef CONFIG_IP_VS_NFCT |
1046 | /* | |
1047 | * Netfilter connection tracking | |
1048 | * (from ip_vs_nfct.c) | |
1049 | */ | |
1050 | static inline int ip_vs_conntrack_enabled(void) | |
1051 | { | |
1052 | return sysctl_ip_vs_conntrack; | |
1053 | } | |
1054 | ||
6523ce15 JA |
1055 | extern void ip_vs_update_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp, |
1056 | int outin); | |
f4bc17cd JA |
1057 | extern int ip_vs_confirm_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp); |
1058 | extern void ip_vs_nfct_expect_related(struct sk_buff *skb, struct nf_conn *ct, | |
1059 | struct ip_vs_conn *cp, u_int8_t proto, | |
1060 | const __be16 port, int from_rs); | |
1061 | extern void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp); | |
1062 | ||
1063 | #else | |
1064 | ||
1065 | static inline int ip_vs_conntrack_enabled(void) | |
1066 | { | |
1067 | return 0; | |
1068 | } | |
1069 | ||
1070 | static inline void ip_vs_update_conntrack(struct sk_buff *skb, | |
1071 | struct ip_vs_conn *cp, int outin) | |
1072 | { | |
1073 | } | |
1074 | ||
1075 | static inline int ip_vs_confirm_conntrack(struct sk_buff *skb, | |
1076 | struct ip_vs_conn *cp) | |
1077 | { | |
1078 | return NF_ACCEPT; | |
1079 | } | |
1080 | ||
1081 | static inline void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp) | |
1082 | { | |
1083 | } | |
1084 | /* CONFIG_IP_VS_NFCT */ | |
1085 | #endif | |
6523ce15 | 1086 | |
1da177e4 LT |
1087 | #endif /* __KERNEL__ */ |
1088 | ||
bc4768eb | 1089 | #endif /* _NET_IP_VS_H */ |