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1da177e4 LT |
1 | /* |
2 | * IPVS An implementation of the IP virtual server support for the | |
3 | * LINUX operating system. IPVS is now implemented as a module | |
4 | * over the Netfilter framework. IPVS can be used to build a | |
5 | * high-performance and highly available server based on a | |
6 | * cluster of servers. | |
7 | * | |
8 | * Version: $Id: ip_vs_core.c,v 1.34 2003/05/10 03:05:23 wensong Exp $ | |
9 | * | |
10 | * Authors: Wensong Zhang <wensong@linuxvirtualserver.org> | |
11 | * Peter Kese <peter.kese@ijs.si> | |
12 | * Julian Anastasov <ja@ssi.bg> | |
13 | * | |
14 | * This program is free software; you can redistribute it and/or | |
15 | * modify it under the terms of the GNU General Public License | |
16 | * as published by the Free Software Foundation; either version | |
17 | * 2 of the License, or (at your option) any later version. | |
18 | * | |
19 | * The IPVS code for kernel 2.2 was done by Wensong Zhang and Peter Kese, | |
20 | * with changes/fixes from Julian Anastasov, Lars Marowsky-Bree, Horms | |
21 | * and others. | |
22 | * | |
23 | * Changes: | |
24 | * Paul `Rusty' Russell properly handle non-linear skbs | |
6869c4d8 | 25 | * Harald Welte don't use nfcache |
1da177e4 LT |
26 | * |
27 | */ | |
28 | ||
29 | #include <linux/module.h> | |
30 | #include <linux/kernel.h> | |
31 | #include <linux/ip.h> | |
32 | #include <linux/tcp.h> | |
33 | #include <linux/icmp.h> | |
34 | ||
35 | #include <net/ip.h> | |
36 | #include <net/tcp.h> | |
37 | #include <net/udp.h> | |
38 | #include <net/icmp.h> /* for icmp_send */ | |
39 | #include <net/route.h> | |
40 | ||
41 | #include <linux/netfilter.h> | |
42 | #include <linux/netfilter_ipv4.h> | |
43 | ||
44 | #include <net/ip_vs.h> | |
45 | ||
46 | ||
47 | EXPORT_SYMBOL(register_ip_vs_scheduler); | |
48 | EXPORT_SYMBOL(unregister_ip_vs_scheduler); | |
49 | EXPORT_SYMBOL(ip_vs_skb_replace); | |
50 | EXPORT_SYMBOL(ip_vs_proto_name); | |
51 | EXPORT_SYMBOL(ip_vs_conn_new); | |
52 | EXPORT_SYMBOL(ip_vs_conn_in_get); | |
53 | EXPORT_SYMBOL(ip_vs_conn_out_get); | |
54 | #ifdef CONFIG_IP_VS_PROTO_TCP | |
55 | EXPORT_SYMBOL(ip_vs_tcp_conn_listen); | |
56 | #endif | |
57 | EXPORT_SYMBOL(ip_vs_conn_put); | |
58 | #ifdef CONFIG_IP_VS_DEBUG | |
59 | EXPORT_SYMBOL(ip_vs_get_debug_level); | |
60 | #endif | |
1da177e4 LT |
61 | |
62 | ||
63 | /* ID used in ICMP lookups */ | |
64 | #define icmp_id(icmph) (((icmph)->un).echo.id) | |
65 | ||
66 | const char *ip_vs_proto_name(unsigned proto) | |
67 | { | |
68 | static char buf[20]; | |
69 | ||
70 | switch (proto) { | |
71 | case IPPROTO_IP: | |
72 | return "IP"; | |
73 | case IPPROTO_UDP: | |
74 | return "UDP"; | |
75 | case IPPROTO_TCP: | |
76 | return "TCP"; | |
77 | case IPPROTO_ICMP: | |
78 | return "ICMP"; | |
79 | default: | |
80 | sprintf(buf, "IP_%d", proto); | |
81 | return buf; | |
82 | } | |
83 | } | |
84 | ||
85 | void ip_vs_init_hash_table(struct list_head *table, int rows) | |
86 | { | |
87 | while (--rows >= 0) | |
88 | INIT_LIST_HEAD(&table[rows]); | |
89 | } | |
90 | ||
91 | static inline void | |
92 | ip_vs_in_stats(struct ip_vs_conn *cp, struct sk_buff *skb) | |
93 | { | |
94 | struct ip_vs_dest *dest = cp->dest; | |
95 | if (dest && (dest->flags & IP_VS_DEST_F_AVAILABLE)) { | |
96 | spin_lock(&dest->stats.lock); | |
97 | dest->stats.inpkts++; | |
98 | dest->stats.inbytes += skb->len; | |
99 | spin_unlock(&dest->stats.lock); | |
100 | ||
101 | spin_lock(&dest->svc->stats.lock); | |
102 | dest->svc->stats.inpkts++; | |
103 | dest->svc->stats.inbytes += skb->len; | |
104 | spin_unlock(&dest->svc->stats.lock); | |
105 | ||
106 | spin_lock(&ip_vs_stats.lock); | |
107 | ip_vs_stats.inpkts++; | |
108 | ip_vs_stats.inbytes += skb->len; | |
109 | spin_unlock(&ip_vs_stats.lock); | |
110 | } | |
111 | } | |
112 | ||
113 | ||
114 | static inline void | |
115 | ip_vs_out_stats(struct ip_vs_conn *cp, struct sk_buff *skb) | |
116 | { | |
117 | struct ip_vs_dest *dest = cp->dest; | |
118 | if (dest && (dest->flags & IP_VS_DEST_F_AVAILABLE)) { | |
119 | spin_lock(&dest->stats.lock); | |
120 | dest->stats.outpkts++; | |
121 | dest->stats.outbytes += skb->len; | |
122 | spin_unlock(&dest->stats.lock); | |
123 | ||
124 | spin_lock(&dest->svc->stats.lock); | |
125 | dest->svc->stats.outpkts++; | |
126 | dest->svc->stats.outbytes += skb->len; | |
127 | spin_unlock(&dest->svc->stats.lock); | |
128 | ||
129 | spin_lock(&ip_vs_stats.lock); | |
130 | ip_vs_stats.outpkts++; | |
131 | ip_vs_stats.outbytes += skb->len; | |
132 | spin_unlock(&ip_vs_stats.lock); | |
133 | } | |
134 | } | |
135 | ||
136 | ||
137 | static inline void | |
138 | ip_vs_conn_stats(struct ip_vs_conn *cp, struct ip_vs_service *svc) | |
139 | { | |
140 | spin_lock(&cp->dest->stats.lock); | |
141 | cp->dest->stats.conns++; | |
142 | spin_unlock(&cp->dest->stats.lock); | |
143 | ||
144 | spin_lock(&svc->stats.lock); | |
145 | svc->stats.conns++; | |
146 | spin_unlock(&svc->stats.lock); | |
147 | ||
148 | spin_lock(&ip_vs_stats.lock); | |
149 | ip_vs_stats.conns++; | |
150 | spin_unlock(&ip_vs_stats.lock); | |
151 | } | |
152 | ||
153 | ||
154 | static inline int | |
155 | ip_vs_set_state(struct ip_vs_conn *cp, int direction, | |
156 | const struct sk_buff *skb, | |
157 | struct ip_vs_protocol *pp) | |
158 | { | |
159 | if (unlikely(!pp->state_transition)) | |
160 | return 0; | |
161 | return pp->state_transition(cp, direction, skb, pp); | |
162 | } | |
163 | ||
164 | ||
1da177e4 LT |
165 | /* |
166 | * IPVS persistent scheduling function | |
167 | * It creates a connection entry according to its template if exists, | |
168 | * or selects a server and creates a connection entry plus a template. | |
169 | * Locking: we are svc user (svc->refcnt), so we hold all dests too | |
170 | * Protocols supported: TCP, UDP | |
171 | */ | |
172 | static struct ip_vs_conn * | |
173 | ip_vs_sched_persist(struct ip_vs_service *svc, | |
174 | const struct sk_buff *skb, | |
014d730d | 175 | __be16 ports[2]) |
1da177e4 LT |
176 | { |
177 | struct ip_vs_conn *cp = NULL; | |
eddc9ec5 | 178 | struct iphdr *iph = ip_hdr(skb); |
1da177e4 LT |
179 | struct ip_vs_dest *dest; |
180 | struct ip_vs_conn *ct; | |
014d730d AV |
181 | __be16 dport; /* destination port to forward */ |
182 | __be32 snet; /* source network of the client, after masking */ | |
1da177e4 LT |
183 | |
184 | /* Mask saddr with the netmask to adjust template granularity */ | |
185 | snet = iph->saddr & svc->netmask; | |
186 | ||
187 | IP_VS_DBG(6, "p-schedule: src %u.%u.%u.%u:%u dest %u.%u.%u.%u:%u " | |
188 | "mnet %u.%u.%u.%u\n", | |
189 | NIPQUAD(iph->saddr), ntohs(ports[0]), | |
190 | NIPQUAD(iph->daddr), ntohs(ports[1]), | |
191 | NIPQUAD(snet)); | |
192 | ||
193 | /* | |
194 | * As far as we know, FTP is a very complicated network protocol, and | |
195 | * it uses control connection and data connections. For active FTP, | |
196 | * FTP server initialize data connection to the client, its source port | |
197 | * is often 20. For passive FTP, FTP server tells the clients the port | |
198 | * that it passively listens to, and the client issues the data | |
199 | * connection. In the tunneling or direct routing mode, the load | |
200 | * balancer is on the client-to-server half of connection, the port | |
201 | * number is unknown to the load balancer. So, a conn template like | |
202 | * <caddr, 0, vaddr, 0, daddr, 0> is created for persistent FTP | |
203 | * service, and a template like <caddr, 0, vaddr, vport, daddr, dport> | |
204 | * is created for other persistent services. | |
205 | */ | |
206 | if (ports[1] == svc->port) { | |
207 | /* Check if a template already exists */ | |
208 | if (svc->port != FTPPORT) | |
87375ab4 | 209 | ct = ip_vs_ct_in_get(iph->protocol, snet, 0, |
1da177e4 LT |
210 | iph->daddr, ports[1]); |
211 | else | |
87375ab4 | 212 | ct = ip_vs_ct_in_get(iph->protocol, snet, 0, |
1da177e4 LT |
213 | iph->daddr, 0); |
214 | ||
215 | if (!ct || !ip_vs_check_template(ct)) { | |
216 | /* | |
217 | * No template found or the dest of the connection | |
218 | * template is not available. | |
219 | */ | |
220 | dest = svc->scheduler->schedule(svc, skb); | |
221 | if (dest == NULL) { | |
222 | IP_VS_DBG(1, "p-schedule: no dest found.\n"); | |
223 | return NULL; | |
224 | } | |
225 | ||
226 | /* | |
227 | * Create a template like <protocol,caddr,0, | |
228 | * vaddr,vport,daddr,dport> for non-ftp service, | |
229 | * and <protocol,caddr,0,vaddr,0,daddr,0> | |
230 | * for ftp service. | |
231 | */ | |
232 | if (svc->port != FTPPORT) | |
233 | ct = ip_vs_conn_new(iph->protocol, | |
234 | snet, 0, | |
235 | iph->daddr, | |
236 | ports[1], | |
237 | dest->addr, dest->port, | |
87375ab4 | 238 | IP_VS_CONN_F_TEMPLATE, |
1da177e4 LT |
239 | dest); |
240 | else | |
241 | ct = ip_vs_conn_new(iph->protocol, | |
242 | snet, 0, | |
243 | iph->daddr, 0, | |
244 | dest->addr, 0, | |
87375ab4 | 245 | IP_VS_CONN_F_TEMPLATE, |
1da177e4 LT |
246 | dest); |
247 | if (ct == NULL) | |
248 | return NULL; | |
249 | ||
250 | ct->timeout = svc->timeout; | |
251 | } else { | |
252 | /* set destination with the found template */ | |
253 | dest = ct->dest; | |
254 | } | |
255 | dport = dest->port; | |
256 | } else { | |
257 | /* | |
258 | * Note: persistent fwmark-based services and persistent | |
259 | * port zero service are handled here. | |
260 | * fwmark template: <IPPROTO_IP,caddr,0,fwmark,0,daddr,0> | |
261 | * port zero template: <protocol,caddr,0,vaddr,0,daddr,0> | |
262 | */ | |
263 | if (svc->fwmark) | |
87375ab4 | 264 | ct = ip_vs_ct_in_get(IPPROTO_IP, snet, 0, |
1da177e4 LT |
265 | htonl(svc->fwmark), 0); |
266 | else | |
87375ab4 | 267 | ct = ip_vs_ct_in_get(iph->protocol, snet, 0, |
1da177e4 LT |
268 | iph->daddr, 0); |
269 | ||
270 | if (!ct || !ip_vs_check_template(ct)) { | |
271 | /* | |
272 | * If it is not persistent port zero, return NULL, | |
273 | * otherwise create a connection template. | |
274 | */ | |
275 | if (svc->port) | |
276 | return NULL; | |
277 | ||
278 | dest = svc->scheduler->schedule(svc, skb); | |
279 | if (dest == NULL) { | |
280 | IP_VS_DBG(1, "p-schedule: no dest found.\n"); | |
281 | return NULL; | |
282 | } | |
283 | ||
284 | /* | |
285 | * Create a template according to the service | |
286 | */ | |
287 | if (svc->fwmark) | |
288 | ct = ip_vs_conn_new(IPPROTO_IP, | |
289 | snet, 0, | |
290 | htonl(svc->fwmark), 0, | |
291 | dest->addr, 0, | |
87375ab4 | 292 | IP_VS_CONN_F_TEMPLATE, |
1da177e4 LT |
293 | dest); |
294 | else | |
295 | ct = ip_vs_conn_new(iph->protocol, | |
296 | snet, 0, | |
297 | iph->daddr, 0, | |
298 | dest->addr, 0, | |
87375ab4 | 299 | IP_VS_CONN_F_TEMPLATE, |
1da177e4 LT |
300 | dest); |
301 | if (ct == NULL) | |
302 | return NULL; | |
303 | ||
304 | ct->timeout = svc->timeout; | |
305 | } else { | |
306 | /* set destination with the found template */ | |
307 | dest = ct->dest; | |
308 | } | |
309 | dport = ports[1]; | |
310 | } | |
311 | ||
312 | /* | |
313 | * Create a new connection according to the template | |
314 | */ | |
315 | cp = ip_vs_conn_new(iph->protocol, | |
316 | iph->saddr, ports[0], | |
317 | iph->daddr, ports[1], | |
318 | dest->addr, dport, | |
319 | 0, | |
320 | dest); | |
321 | if (cp == NULL) { | |
322 | ip_vs_conn_put(ct); | |
323 | return NULL; | |
324 | } | |
325 | ||
326 | /* | |
327 | * Add its control | |
328 | */ | |
329 | ip_vs_control_add(cp, ct); | |
330 | ip_vs_conn_put(ct); | |
331 | ||
332 | ip_vs_conn_stats(cp, svc); | |
333 | return cp; | |
334 | } | |
335 | ||
336 | ||
337 | /* | |
338 | * IPVS main scheduling function | |
339 | * It selects a server according to the virtual service, and | |
340 | * creates a connection entry. | |
341 | * Protocols supported: TCP, UDP | |
342 | */ | |
343 | struct ip_vs_conn * | |
344 | ip_vs_schedule(struct ip_vs_service *svc, const struct sk_buff *skb) | |
345 | { | |
346 | struct ip_vs_conn *cp = NULL; | |
eddc9ec5 | 347 | struct iphdr *iph = ip_hdr(skb); |
1da177e4 | 348 | struct ip_vs_dest *dest; |
014d730d | 349 | __be16 _ports[2], *pptr; |
1da177e4 LT |
350 | |
351 | pptr = skb_header_pointer(skb, iph->ihl*4, | |
352 | sizeof(_ports), _ports); | |
353 | if (pptr == NULL) | |
354 | return NULL; | |
355 | ||
356 | /* | |
357 | * Persistent service | |
358 | */ | |
359 | if (svc->flags & IP_VS_SVC_F_PERSISTENT) | |
360 | return ip_vs_sched_persist(svc, skb, pptr); | |
361 | ||
362 | /* | |
363 | * Non-persistent service | |
364 | */ | |
365 | if (!svc->fwmark && pptr[1] != svc->port) { | |
366 | if (!svc->port) | |
367 | IP_VS_ERR("Schedule: port zero only supported " | |
368 | "in persistent services, " | |
369 | "check your ipvs configuration\n"); | |
370 | return NULL; | |
371 | } | |
372 | ||
373 | dest = svc->scheduler->schedule(svc, skb); | |
374 | if (dest == NULL) { | |
375 | IP_VS_DBG(1, "Schedule: no dest found.\n"); | |
376 | return NULL; | |
377 | } | |
378 | ||
379 | /* | |
380 | * Create a connection entry. | |
381 | */ | |
382 | cp = ip_vs_conn_new(iph->protocol, | |
383 | iph->saddr, pptr[0], | |
384 | iph->daddr, pptr[1], | |
385 | dest->addr, dest->port?dest->port:pptr[1], | |
386 | 0, | |
387 | dest); | |
388 | if (cp == NULL) | |
389 | return NULL; | |
390 | ||
391 | IP_VS_DBG(6, "Schedule fwd:%c c:%u.%u.%u.%u:%u v:%u.%u.%u.%u:%u " | |
4b5bdf5c | 392 | "d:%u.%u.%u.%u:%u conn->flags:%X conn->refcnt:%d\n", |
1da177e4 LT |
393 | ip_vs_fwd_tag(cp), |
394 | NIPQUAD(cp->caddr), ntohs(cp->cport), | |
395 | NIPQUAD(cp->vaddr), ntohs(cp->vport), | |
396 | NIPQUAD(cp->daddr), ntohs(cp->dport), | |
397 | cp->flags, atomic_read(&cp->refcnt)); | |
398 | ||
399 | ip_vs_conn_stats(cp, svc); | |
400 | return cp; | |
401 | } | |
402 | ||
403 | ||
404 | /* | |
405 | * Pass or drop the packet. | |
406 | * Called by ip_vs_in, when the virtual service is available but | |
407 | * no destination is available for a new connection. | |
408 | */ | |
409 | int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb, | |
410 | struct ip_vs_protocol *pp) | |
411 | { | |
014d730d | 412 | __be16 _ports[2], *pptr; |
eddc9ec5 | 413 | struct iphdr *iph = ip_hdr(skb); |
1da177e4 LT |
414 | |
415 | pptr = skb_header_pointer(skb, iph->ihl*4, | |
416 | sizeof(_ports), _ports); | |
417 | if (pptr == NULL) { | |
418 | ip_vs_service_put(svc); | |
419 | return NF_DROP; | |
420 | } | |
421 | ||
422 | /* if it is fwmark-based service, the cache_bypass sysctl is up | |
423 | and the destination is RTN_UNICAST (and not local), then create | |
424 | a cache_bypass connection entry */ | |
425 | if (sysctl_ip_vs_cache_bypass && svc->fwmark | |
426 | && (inet_addr_type(iph->daddr) == RTN_UNICAST)) { | |
427 | int ret, cs; | |
428 | struct ip_vs_conn *cp; | |
429 | ||
430 | ip_vs_service_put(svc); | |
431 | ||
432 | /* create a new connection entry */ | |
433 | IP_VS_DBG(6, "ip_vs_leave: create a cache_bypass entry\n"); | |
434 | cp = ip_vs_conn_new(iph->protocol, | |
435 | iph->saddr, pptr[0], | |
436 | iph->daddr, pptr[1], | |
437 | 0, 0, | |
438 | IP_VS_CONN_F_BYPASS, | |
439 | NULL); | |
440 | if (cp == NULL) | |
441 | return NF_DROP; | |
442 | ||
443 | /* statistics */ | |
444 | ip_vs_in_stats(cp, skb); | |
445 | ||
446 | /* set state */ | |
447 | cs = ip_vs_set_state(cp, IP_VS_DIR_INPUT, skb, pp); | |
448 | ||
449 | /* transmit the first SYN packet */ | |
450 | ret = cp->packet_xmit(skb, cp, pp); | |
451 | /* do not touch skb anymore */ | |
452 | ||
453 | atomic_inc(&cp->in_pkts); | |
454 | ip_vs_conn_put(cp); | |
455 | return ret; | |
456 | } | |
457 | ||
458 | /* | |
459 | * When the virtual ftp service is presented, packets destined | |
460 | * for other services on the VIP may get here (except services | |
461 | * listed in the ipvs table), pass the packets, because it is | |
462 | * not ipvs job to decide to drop the packets. | |
463 | */ | |
464 | if ((svc->port == FTPPORT) && (pptr[1] != FTPPORT)) { | |
465 | ip_vs_service_put(svc); | |
466 | return NF_ACCEPT; | |
467 | } | |
468 | ||
469 | ip_vs_service_put(svc); | |
470 | ||
471 | /* | |
472 | * Notify the client that the destination is unreachable, and | |
473 | * release the socket buffer. | |
474 | * Since it is in IP layer, the TCP socket is not actually | |
475 | * created, the TCP RST packet cannot be sent, instead that | |
476 | * ICMP_PORT_UNREACH is sent here no matter it is TCP/UDP. --WZ | |
477 | */ | |
478 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); | |
479 | return NF_DROP; | |
480 | } | |
481 | ||
482 | ||
483 | /* | |
6e23ae2a | 484 | * It is hooked before NF_IP_PRI_NAT_SRC at the NF_INET_POST_ROUTING |
1da177e4 LT |
485 | * chain, and is used for VS/NAT. |
486 | * It detects packets for VS/NAT connections and sends the packets | |
487 | * immediately. This can avoid that iptable_nat mangles the packets | |
488 | * for VS/NAT. | |
489 | */ | |
490 | static unsigned int ip_vs_post_routing(unsigned int hooknum, | |
3db05fea | 491 | struct sk_buff *skb, |
1da177e4 LT |
492 | const struct net_device *in, |
493 | const struct net_device *out, | |
494 | int (*okfn)(struct sk_buff *)) | |
495 | { | |
3db05fea | 496 | if (!skb->ipvs_property) |
1da177e4 | 497 | return NF_ACCEPT; |
1da177e4 | 498 | /* The packet was sent from IPVS, exit this chain */ |
abbcc739 | 499 | return NF_STOP; |
1da177e4 LT |
500 | } |
501 | ||
b1550f22 | 502 | __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset) |
1da177e4 | 503 | { |
d3bc23e7 | 504 | return csum_fold(skb_checksum(skb, offset, skb->len - offset, 0)); |
1da177e4 LT |
505 | } |
506 | ||
776c729e | 507 | static inline int ip_vs_gather_frags(struct sk_buff *skb, u_int32_t user) |
1da177e4 | 508 | { |
776c729e HX |
509 | int err = ip_defrag(skb, user); |
510 | ||
511 | if (!err) | |
eddc9ec5 | 512 | ip_send_check(ip_hdr(skb)); |
776c729e HX |
513 | |
514 | return err; | |
1da177e4 LT |
515 | } |
516 | ||
517 | /* | |
518 | * Packet has been made sufficiently writable in caller | |
519 | * - inout: 1=in->out, 0=out->in | |
520 | */ | |
521 | void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp, | |
522 | struct ip_vs_conn *cp, int inout) | |
523 | { | |
eddc9ec5 | 524 | struct iphdr *iph = ip_hdr(skb); |
1da177e4 | 525 | unsigned int icmp_offset = iph->ihl*4; |
d56f90a7 ACM |
526 | struct icmphdr *icmph = (struct icmphdr *)(skb_network_header(skb) + |
527 | icmp_offset); | |
1da177e4 LT |
528 | struct iphdr *ciph = (struct iphdr *)(icmph + 1); |
529 | ||
530 | if (inout) { | |
531 | iph->saddr = cp->vaddr; | |
532 | ip_send_check(iph); | |
533 | ciph->daddr = cp->vaddr; | |
534 | ip_send_check(ciph); | |
535 | } else { | |
536 | iph->daddr = cp->daddr; | |
537 | ip_send_check(iph); | |
538 | ciph->saddr = cp->daddr; | |
539 | ip_send_check(ciph); | |
540 | } | |
541 | ||
542 | /* the TCP/UDP port */ | |
543 | if (IPPROTO_TCP == ciph->protocol || IPPROTO_UDP == ciph->protocol) { | |
014d730d | 544 | __be16 *ports = (void *)ciph + ciph->ihl*4; |
1da177e4 LT |
545 | |
546 | if (inout) | |
547 | ports[1] = cp->vport; | |
548 | else | |
549 | ports[0] = cp->dport; | |
550 | } | |
551 | ||
552 | /* And finally the ICMP checksum */ | |
553 | icmph->checksum = 0; | |
554 | icmph->checksum = ip_vs_checksum_complete(skb, icmp_offset); | |
555 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
556 | ||
557 | if (inout) | |
558 | IP_VS_DBG_PKT(11, pp, skb, (void *)ciph - (void *)iph, | |
559 | "Forwarding altered outgoing ICMP"); | |
560 | else | |
561 | IP_VS_DBG_PKT(11, pp, skb, (void *)ciph - (void *)iph, | |
562 | "Forwarding altered incoming ICMP"); | |
563 | } | |
564 | ||
565 | /* | |
566 | * Handle ICMP messages in the inside-to-outside direction (outgoing). | |
567 | * Find any that might be relevant, check against existing connections, | |
568 | * forward to the right destination host if relevant. | |
569 | * Currently handles error types - unreachable, quench, ttl exceeded. | |
570 | * (Only used in VS/NAT) | |
571 | */ | |
3db05fea | 572 | static int ip_vs_out_icmp(struct sk_buff *skb, int *related) |
1da177e4 | 573 | { |
1da177e4 LT |
574 | struct iphdr *iph; |
575 | struct icmphdr _icmph, *ic; | |
576 | struct iphdr _ciph, *cih; /* The ip header contained within the ICMP */ | |
577 | struct ip_vs_conn *cp; | |
578 | struct ip_vs_protocol *pp; | |
579 | unsigned int offset, ihl, verdict; | |
580 | ||
581 | *related = 1; | |
582 | ||
583 | /* reassemble IP fragments */ | |
eddc9ec5 | 584 | if (ip_hdr(skb)->frag_off & htons(IP_MF | IP_OFFSET)) { |
776c729e | 585 | if (ip_vs_gather_frags(skb, IP_DEFRAG_VS_OUT)) |
1da177e4 | 586 | return NF_STOLEN; |
1da177e4 LT |
587 | } |
588 | ||
eddc9ec5 | 589 | iph = ip_hdr(skb); |
1da177e4 LT |
590 | offset = ihl = iph->ihl * 4; |
591 | ic = skb_header_pointer(skb, offset, sizeof(_icmph), &_icmph); | |
592 | if (ic == NULL) | |
593 | return NF_DROP; | |
594 | ||
595 | IP_VS_DBG(12, "Outgoing ICMP (%d,%d) %u.%u.%u.%u->%u.%u.%u.%u\n", | |
596 | ic->type, ntohs(icmp_id(ic)), | |
597 | NIPQUAD(iph->saddr), NIPQUAD(iph->daddr)); | |
598 | ||
599 | /* | |
600 | * Work through seeing if this is for us. | |
601 | * These checks are supposed to be in an order that means easy | |
602 | * things are checked first to speed up processing.... however | |
603 | * this means that some packets will manage to get a long way | |
604 | * down this stack and then be rejected, but that's life. | |
605 | */ | |
606 | if ((ic->type != ICMP_DEST_UNREACH) && | |
607 | (ic->type != ICMP_SOURCE_QUENCH) && | |
608 | (ic->type != ICMP_TIME_EXCEEDED)) { | |
609 | *related = 0; | |
610 | return NF_ACCEPT; | |
611 | } | |
612 | ||
613 | /* Now find the contained IP header */ | |
614 | offset += sizeof(_icmph); | |
615 | cih = skb_header_pointer(skb, offset, sizeof(_ciph), &_ciph); | |
616 | if (cih == NULL) | |
617 | return NF_ACCEPT; /* The packet looks wrong, ignore */ | |
618 | ||
619 | pp = ip_vs_proto_get(cih->protocol); | |
620 | if (!pp) | |
621 | return NF_ACCEPT; | |
622 | ||
623 | /* Is the embedded protocol header present? */ | |
4412ec49 | 624 | if (unlikely(cih->frag_off & htons(IP_OFFSET) && |
1da177e4 LT |
625 | pp->dont_defrag)) |
626 | return NF_ACCEPT; | |
627 | ||
628 | IP_VS_DBG_PKT(11, pp, skb, offset, "Checking outgoing ICMP for"); | |
629 | ||
630 | offset += cih->ihl * 4; | |
631 | ||
632 | /* The embedded headers contain source and dest in reverse order */ | |
633 | cp = pp->conn_out_get(skb, pp, cih, offset, 1); | |
634 | if (!cp) | |
635 | return NF_ACCEPT; | |
636 | ||
637 | verdict = NF_DROP; | |
638 | ||
639 | if (IP_VS_FWD_METHOD(cp) != 0) { | |
464c4f18 | 640 | IP_VS_ERR("shouldn't reach here, because the box is on the " |
1da177e4 LT |
641 | "half connection in the tun/dr module.\n"); |
642 | } | |
643 | ||
644 | /* Ensure the checksum is correct */ | |
60476372 | 645 | if (!skb_csum_unnecessary(skb) && ip_vs_checksum_complete(skb, ihl)) { |
1da177e4 LT |
646 | /* Failed checksum! */ |
647 | IP_VS_DBG(1, "Forward ICMP: failed checksum from %d.%d.%d.%d!\n", | |
648 | NIPQUAD(iph->saddr)); | |
649 | goto out; | |
650 | } | |
651 | ||
652 | if (IPPROTO_TCP == cih->protocol || IPPROTO_UDP == cih->protocol) | |
653 | offset += 2 * sizeof(__u16); | |
af1e1cf0 | 654 | if (!skb_make_writable(skb, offset)) |
1da177e4 | 655 | goto out; |
1da177e4 LT |
656 | |
657 | ip_vs_nat_icmp(skb, pp, cp, 1); | |
658 | ||
659 | /* do the statistics and put it back */ | |
660 | ip_vs_out_stats(cp, skb); | |
661 | ||
6869c4d8 | 662 | skb->ipvs_property = 1; |
1da177e4 LT |
663 | verdict = NF_ACCEPT; |
664 | ||
665 | out: | |
666 | __ip_vs_conn_put(cp); | |
667 | ||
668 | return verdict; | |
669 | } | |
670 | ||
671 | static inline int is_tcp_reset(const struct sk_buff *skb) | |
672 | { | |
673 | struct tcphdr _tcph, *th; | |
674 | ||
c9bdd4b5 | 675 | th = skb_header_pointer(skb, ip_hdrlen(skb), sizeof(_tcph), &_tcph); |
1da177e4 LT |
676 | if (th == NULL) |
677 | return 0; | |
678 | return th->rst; | |
679 | } | |
680 | ||
681 | /* | |
6e23ae2a | 682 | * It is hooked at the NF_INET_FORWARD chain, used only for VS/NAT. |
1da177e4 LT |
683 | * Check if outgoing packet belongs to the established ip_vs_conn, |
684 | * rewrite addresses of the packet and send it on its way... | |
685 | */ | |
686 | static unsigned int | |
3db05fea | 687 | ip_vs_out(unsigned int hooknum, struct sk_buff *skb, |
1da177e4 LT |
688 | const struct net_device *in, const struct net_device *out, |
689 | int (*okfn)(struct sk_buff *)) | |
690 | { | |
1da177e4 LT |
691 | struct iphdr *iph; |
692 | struct ip_vs_protocol *pp; | |
693 | struct ip_vs_conn *cp; | |
694 | int ihl; | |
695 | ||
696 | EnterFunction(11); | |
697 | ||
6869c4d8 | 698 | if (skb->ipvs_property) |
1da177e4 LT |
699 | return NF_ACCEPT; |
700 | ||
eddc9ec5 | 701 | iph = ip_hdr(skb); |
1da177e4 | 702 | if (unlikely(iph->protocol == IPPROTO_ICMP)) { |
3db05fea | 703 | int related, verdict = ip_vs_out_icmp(skb, &related); |
1da177e4 LT |
704 | |
705 | if (related) | |
706 | return verdict; | |
eddc9ec5 | 707 | iph = ip_hdr(skb); |
1da177e4 LT |
708 | } |
709 | ||
710 | pp = ip_vs_proto_get(iph->protocol); | |
711 | if (unlikely(!pp)) | |
712 | return NF_ACCEPT; | |
713 | ||
714 | /* reassemble IP fragments */ | |
4412ec49 | 715 | if (unlikely(iph->frag_off & htons(IP_MF|IP_OFFSET) && |
1da177e4 | 716 | !pp->dont_defrag)) { |
776c729e | 717 | if (ip_vs_gather_frags(skb, IP_DEFRAG_VS_OUT)) |
1da177e4 | 718 | return NF_STOLEN; |
eddc9ec5 | 719 | iph = ip_hdr(skb); |
1da177e4 LT |
720 | } |
721 | ||
722 | ihl = iph->ihl << 2; | |
723 | ||
724 | /* | |
725 | * Check if the packet belongs to an existing entry | |
726 | */ | |
727 | cp = pp->conn_out_get(skb, pp, iph, ihl, 0); | |
728 | ||
729 | if (unlikely(!cp)) { | |
730 | if (sysctl_ip_vs_nat_icmp_send && | |
731 | (pp->protocol == IPPROTO_TCP || | |
732 | pp->protocol == IPPROTO_UDP)) { | |
014d730d | 733 | __be16 _ports[2], *pptr; |
1da177e4 LT |
734 | |
735 | pptr = skb_header_pointer(skb, ihl, | |
736 | sizeof(_ports), _ports); | |
737 | if (pptr == NULL) | |
738 | return NF_ACCEPT; /* Not for me */ | |
739 | if (ip_vs_lookup_real_service(iph->protocol, | |
740 | iph->saddr, pptr[0])) { | |
741 | /* | |
742 | * Notify the real server: there is no | |
743 | * existing entry if it is not RST | |
744 | * packet or not TCP packet. | |
745 | */ | |
746 | if (iph->protocol != IPPROTO_TCP | |
747 | || !is_tcp_reset(skb)) { | |
748 | icmp_send(skb,ICMP_DEST_UNREACH, | |
749 | ICMP_PORT_UNREACH, 0); | |
750 | return NF_DROP; | |
751 | } | |
752 | } | |
753 | } | |
754 | IP_VS_DBG_PKT(12, pp, skb, 0, | |
755 | "packet continues traversal as normal"); | |
756 | return NF_ACCEPT; | |
757 | } | |
758 | ||
759 | IP_VS_DBG_PKT(11, pp, skb, 0, "Outgoing packet"); | |
760 | ||
af1e1cf0 | 761 | if (!skb_make_writable(skb, ihl)) |
1da177e4 LT |
762 | goto drop; |
763 | ||
764 | /* mangle the packet */ | |
3db05fea | 765 | if (pp->snat_handler && !pp->snat_handler(skb, pp, cp)) |
1da177e4 | 766 | goto drop; |
eddc9ec5 ACM |
767 | ip_hdr(skb)->saddr = cp->vaddr; |
768 | ip_send_check(ip_hdr(skb)); | |
1da177e4 | 769 | |
e905a9ed YH |
770 | /* For policy routing, packets originating from this |
771 | * machine itself may be routed differently to packets | |
772 | * passing through. We want this packet to be routed as | |
773 | * if it came from this machine itself. So re-compute | |
774 | * the routing information. | |
775 | */ | |
3db05fea | 776 | if (ip_route_me_harder(skb, RTN_LOCAL) != 0) |
e905a9ed | 777 | goto drop; |
901eaf6c | 778 | |
1da177e4 LT |
779 | IP_VS_DBG_PKT(10, pp, skb, 0, "After SNAT"); |
780 | ||
781 | ip_vs_out_stats(cp, skb); | |
782 | ip_vs_set_state(cp, IP_VS_DIR_OUTPUT, skb, pp); | |
783 | ip_vs_conn_put(cp); | |
784 | ||
6869c4d8 | 785 | skb->ipvs_property = 1; |
1da177e4 LT |
786 | |
787 | LeaveFunction(11); | |
788 | return NF_ACCEPT; | |
789 | ||
790 | drop: | |
791 | ip_vs_conn_put(cp); | |
3db05fea | 792 | kfree_skb(skb); |
1da177e4 LT |
793 | return NF_STOLEN; |
794 | } | |
795 | ||
796 | ||
797 | /* | |
798 | * Handle ICMP messages in the outside-to-inside direction (incoming). | |
799 | * Find any that might be relevant, check against existing connections, | |
800 | * forward to the right destination host if relevant. | |
801 | * Currently handles error types - unreachable, quench, ttl exceeded. | |
802 | */ | |
e905a9ed | 803 | static int |
3db05fea | 804 | ip_vs_in_icmp(struct sk_buff *skb, int *related, unsigned int hooknum) |
1da177e4 | 805 | { |
1da177e4 LT |
806 | struct iphdr *iph; |
807 | struct icmphdr _icmph, *ic; | |
808 | struct iphdr _ciph, *cih; /* The ip header contained within the ICMP */ | |
809 | struct ip_vs_conn *cp; | |
810 | struct ip_vs_protocol *pp; | |
811 | unsigned int offset, ihl, verdict; | |
812 | ||
813 | *related = 1; | |
814 | ||
815 | /* reassemble IP fragments */ | |
eddc9ec5 | 816 | if (ip_hdr(skb)->frag_off & htons(IP_MF | IP_OFFSET)) { |
6e23ae2a | 817 | if (ip_vs_gather_frags(skb, hooknum == NF_INET_LOCAL_IN ? |
776c729e | 818 | IP_DEFRAG_VS_IN : IP_DEFRAG_VS_FWD)) |
1da177e4 | 819 | return NF_STOLEN; |
1da177e4 LT |
820 | } |
821 | ||
eddc9ec5 | 822 | iph = ip_hdr(skb); |
1da177e4 LT |
823 | offset = ihl = iph->ihl * 4; |
824 | ic = skb_header_pointer(skb, offset, sizeof(_icmph), &_icmph); | |
825 | if (ic == NULL) | |
826 | return NF_DROP; | |
827 | ||
828 | IP_VS_DBG(12, "Incoming ICMP (%d,%d) %u.%u.%u.%u->%u.%u.%u.%u\n", | |
829 | ic->type, ntohs(icmp_id(ic)), | |
830 | NIPQUAD(iph->saddr), NIPQUAD(iph->daddr)); | |
831 | ||
832 | /* | |
833 | * Work through seeing if this is for us. | |
834 | * These checks are supposed to be in an order that means easy | |
835 | * things are checked first to speed up processing.... however | |
836 | * this means that some packets will manage to get a long way | |
837 | * down this stack and then be rejected, but that's life. | |
838 | */ | |
839 | if ((ic->type != ICMP_DEST_UNREACH) && | |
840 | (ic->type != ICMP_SOURCE_QUENCH) && | |
841 | (ic->type != ICMP_TIME_EXCEEDED)) { | |
842 | *related = 0; | |
843 | return NF_ACCEPT; | |
844 | } | |
845 | ||
846 | /* Now find the contained IP header */ | |
847 | offset += sizeof(_icmph); | |
848 | cih = skb_header_pointer(skb, offset, sizeof(_ciph), &_ciph); | |
849 | if (cih == NULL) | |
850 | return NF_ACCEPT; /* The packet looks wrong, ignore */ | |
851 | ||
852 | pp = ip_vs_proto_get(cih->protocol); | |
853 | if (!pp) | |
854 | return NF_ACCEPT; | |
855 | ||
856 | /* Is the embedded protocol header present? */ | |
4412ec49 | 857 | if (unlikely(cih->frag_off & htons(IP_OFFSET) && |
1da177e4 LT |
858 | pp->dont_defrag)) |
859 | return NF_ACCEPT; | |
860 | ||
861 | IP_VS_DBG_PKT(11, pp, skb, offset, "Checking incoming ICMP for"); | |
862 | ||
863 | offset += cih->ihl * 4; | |
864 | ||
865 | /* The embedded headers contain source and dest in reverse order */ | |
866 | cp = pp->conn_in_get(skb, pp, cih, offset, 1); | |
867 | if (!cp) | |
868 | return NF_ACCEPT; | |
869 | ||
870 | verdict = NF_DROP; | |
871 | ||
872 | /* Ensure the checksum is correct */ | |
60476372 | 873 | if (!skb_csum_unnecessary(skb) && ip_vs_checksum_complete(skb, ihl)) { |
1da177e4 LT |
874 | /* Failed checksum! */ |
875 | IP_VS_DBG(1, "Incoming ICMP: failed checksum from %d.%d.%d.%d!\n", | |
876 | NIPQUAD(iph->saddr)); | |
877 | goto out; | |
878 | } | |
879 | ||
880 | /* do the statistics and put it back */ | |
881 | ip_vs_in_stats(cp, skb); | |
882 | if (IPPROTO_TCP == cih->protocol || IPPROTO_UDP == cih->protocol) | |
883 | offset += 2 * sizeof(__u16); | |
884 | verdict = ip_vs_icmp_xmit(skb, cp, pp, offset); | |
885 | /* do not touch skb anymore */ | |
886 | ||
887 | out: | |
888 | __ip_vs_conn_put(cp); | |
889 | ||
890 | return verdict; | |
891 | } | |
892 | ||
893 | /* | |
894 | * Check if it's for virtual services, look it up, | |
895 | * and send it on its way... | |
896 | */ | |
897 | static unsigned int | |
3db05fea | 898 | ip_vs_in(unsigned int hooknum, struct sk_buff *skb, |
1da177e4 LT |
899 | const struct net_device *in, const struct net_device *out, |
900 | int (*okfn)(struct sk_buff *)) | |
901 | { | |
1da177e4 LT |
902 | struct iphdr *iph; |
903 | struct ip_vs_protocol *pp; | |
904 | struct ip_vs_conn *cp; | |
905 | int ret, restart; | |
906 | int ihl; | |
907 | ||
908 | /* | |
909 | * Big tappo: only PACKET_HOST (neither loopback nor mcasts) | |
910 | * ... don't know why 1st test DOES NOT include 2nd (?) | |
911 | */ | |
912 | if (unlikely(skb->pkt_type != PACKET_HOST | |
0cc217e1 | 913 | || skb->dev->flags & IFF_LOOPBACK || skb->sk)) { |
1da177e4 LT |
914 | IP_VS_DBG(12, "packet type=%d proto=%d daddr=%d.%d.%d.%d ignored\n", |
915 | skb->pkt_type, | |
eddc9ec5 ACM |
916 | ip_hdr(skb)->protocol, |
917 | NIPQUAD(ip_hdr(skb)->daddr)); | |
1da177e4 LT |
918 | return NF_ACCEPT; |
919 | } | |
920 | ||
eddc9ec5 | 921 | iph = ip_hdr(skb); |
1da177e4 | 922 | if (unlikely(iph->protocol == IPPROTO_ICMP)) { |
3db05fea | 923 | int related, verdict = ip_vs_in_icmp(skb, &related, hooknum); |
1da177e4 LT |
924 | |
925 | if (related) | |
926 | return verdict; | |
eddc9ec5 | 927 | iph = ip_hdr(skb); |
1da177e4 LT |
928 | } |
929 | ||
930 | /* Protocol supported? */ | |
931 | pp = ip_vs_proto_get(iph->protocol); | |
932 | if (unlikely(!pp)) | |
933 | return NF_ACCEPT; | |
934 | ||
935 | ihl = iph->ihl << 2; | |
936 | ||
937 | /* | |
938 | * Check if the packet belongs to an existing connection entry | |
939 | */ | |
940 | cp = pp->conn_in_get(skb, pp, iph, ihl, 0); | |
941 | ||
942 | if (unlikely(!cp)) { | |
943 | int v; | |
944 | ||
945 | if (!pp->conn_schedule(skb, pp, &v, &cp)) | |
946 | return v; | |
947 | } | |
948 | ||
949 | if (unlikely(!cp)) { | |
950 | /* sorry, all this trouble for a no-hit :) */ | |
951 | IP_VS_DBG_PKT(12, pp, skb, 0, | |
952 | "packet continues traversal as normal"); | |
953 | return NF_ACCEPT; | |
954 | } | |
955 | ||
956 | IP_VS_DBG_PKT(11, pp, skb, 0, "Incoming packet"); | |
957 | ||
958 | /* Check the server status */ | |
959 | if (cp->dest && !(cp->dest->flags & IP_VS_DEST_F_AVAILABLE)) { | |
960 | /* the destination server is not available */ | |
961 | ||
962 | if (sysctl_ip_vs_expire_nodest_conn) { | |
963 | /* try to expire the connection immediately */ | |
964 | ip_vs_conn_expire_now(cp); | |
1da177e4 | 965 | } |
dc8103f2 JA |
966 | /* don't restart its timer, and silently |
967 | drop the packet. */ | |
968 | __ip_vs_conn_put(cp); | |
1da177e4 LT |
969 | return NF_DROP; |
970 | } | |
971 | ||
972 | ip_vs_in_stats(cp, skb); | |
973 | restart = ip_vs_set_state(cp, IP_VS_DIR_INPUT, skb, pp); | |
974 | if (cp->packet_xmit) | |
975 | ret = cp->packet_xmit(skb, cp, pp); | |
976 | /* do not touch skb anymore */ | |
977 | else { | |
978 | IP_VS_DBG_RL("warning: packet_xmit is null"); | |
979 | ret = NF_ACCEPT; | |
980 | } | |
981 | ||
efac5276 RB |
982 | /* Increase its packet counter and check if it is needed |
983 | * to be synchronized | |
984 | * | |
985 | * Sync connection if it is about to close to | |
986 | * encorage the standby servers to update the connections timeout | |
987 | */ | |
1da177e4 LT |
988 | atomic_inc(&cp->in_pkts); |
989 | if ((ip_vs_sync_state & IP_VS_STATE_MASTER) && | |
efac5276 RB |
990 | (((cp->protocol != IPPROTO_TCP || |
991 | cp->state == IP_VS_TCP_S_ESTABLISHED) && | |
992 | (atomic_read(&cp->in_pkts) % sysctl_ip_vs_sync_threshold[1] | |
993 | == sysctl_ip_vs_sync_threshold[0])) || | |
994 | ((cp->protocol == IPPROTO_TCP) && (cp->old_state != cp->state) && | |
995 | ((cp->state == IP_VS_TCP_S_FIN_WAIT) || | |
996 | (cp->state == IP_VS_TCP_S_CLOSE))))) | |
1da177e4 | 997 | ip_vs_sync_conn(cp); |
efac5276 | 998 | cp->old_state = cp->state; |
1da177e4 LT |
999 | |
1000 | ip_vs_conn_put(cp); | |
1001 | return ret; | |
1002 | } | |
1003 | ||
1004 | ||
1005 | /* | |
6e23ae2a | 1006 | * It is hooked at the NF_INET_FORWARD chain, in order to catch ICMP |
1da177e4 LT |
1007 | * related packets destined for 0.0.0.0/0. |
1008 | * When fwmark-based virtual service is used, such as transparent | |
1009 | * cache cluster, TCP packets can be marked and routed to ip_vs_in, | |
1010 | * but ICMP destined for 0.0.0.0/0 cannot not be easily marked and | |
6e23ae2a | 1011 | * sent to ip_vs_in_icmp. So, catch them at the NF_INET_FORWARD chain |
1da177e4 LT |
1012 | * and send them to ip_vs_in_icmp. |
1013 | */ | |
1014 | static unsigned int | |
3db05fea | 1015 | ip_vs_forward_icmp(unsigned int hooknum, struct sk_buff *skb, |
1da177e4 LT |
1016 | const struct net_device *in, const struct net_device *out, |
1017 | int (*okfn)(struct sk_buff *)) | |
1018 | { | |
1019 | int r; | |
1020 | ||
3db05fea | 1021 | if (ip_hdr(skb)->protocol != IPPROTO_ICMP) |
1da177e4 LT |
1022 | return NF_ACCEPT; |
1023 | ||
3db05fea | 1024 | return ip_vs_in_icmp(skb, &r, hooknum); |
1da177e4 LT |
1025 | } |
1026 | ||
1027 | ||
41c5b317 PM |
1028 | static struct nf_hook_ops ip_vs_ops[] = { |
1029 | /* After packet filtering, forward packet through VS/DR, VS/TUN, | |
1030 | * or VS/NAT(change destination), so that filtering rules can be | |
1031 | * applied to IPVS. */ | |
1032 | { | |
1033 | .hook = ip_vs_in, | |
1034 | .owner = THIS_MODULE, | |
1035 | .pf = PF_INET, | |
1036 | .hooknum = NF_INET_LOCAL_IN, | |
1037 | .priority = 100, | |
1038 | }, | |
1039 | /* After packet filtering, change source only for VS/NAT */ | |
1040 | { | |
1041 | .hook = ip_vs_out, | |
1042 | .owner = THIS_MODULE, | |
1043 | .pf = PF_INET, | |
1044 | .hooknum = NF_INET_FORWARD, | |
1045 | .priority = 100, | |
1046 | }, | |
1047 | /* After packet filtering (but before ip_vs_out_icmp), catch icmp | |
1048 | * destined for 0.0.0.0/0, which is for incoming IPVS connections */ | |
1049 | { | |
1050 | .hook = ip_vs_forward_icmp, | |
1051 | .owner = THIS_MODULE, | |
1052 | .pf = PF_INET, | |
1053 | .hooknum = NF_INET_FORWARD, | |
1054 | .priority = 99, | |
1055 | }, | |
1056 | /* Before the netfilter connection tracking, exit from POST_ROUTING */ | |
1057 | { | |
1058 | .hook = ip_vs_post_routing, | |
1059 | .owner = THIS_MODULE, | |
1060 | .pf = PF_INET, | |
1061 | .hooknum = NF_INET_POST_ROUTING, | |
1062 | .priority = NF_IP_PRI_NAT_SRC-1, | |
1063 | }, | |
1da177e4 LT |
1064 | }; |
1065 | ||
1066 | ||
1067 | /* | |
1068 | * Initialize IP Virtual Server | |
1069 | */ | |
1070 | static int __init ip_vs_init(void) | |
1071 | { | |
1072 | int ret; | |
1073 | ||
1074 | ret = ip_vs_control_init(); | |
1075 | if (ret < 0) { | |
1076 | IP_VS_ERR("can't setup control.\n"); | |
1077 | goto cleanup_nothing; | |
1078 | } | |
1079 | ||
1080 | ip_vs_protocol_init(); | |
1081 | ||
1082 | ret = ip_vs_app_init(); | |
1083 | if (ret < 0) { | |
1084 | IP_VS_ERR("can't setup application helper.\n"); | |
1085 | goto cleanup_protocol; | |
1086 | } | |
1087 | ||
1088 | ret = ip_vs_conn_init(); | |
1089 | if (ret < 0) { | |
1090 | IP_VS_ERR("can't setup connection table.\n"); | |
1091 | goto cleanup_app; | |
1092 | } | |
1093 | ||
41c5b317 | 1094 | ret = nf_register_hooks(ip_vs_ops, ARRAY_SIZE(ip_vs_ops)); |
1da177e4 | 1095 | if (ret < 0) { |
41c5b317 | 1096 | IP_VS_ERR("can't register hooks.\n"); |
1da177e4 LT |
1097 | goto cleanup_conn; |
1098 | } | |
1099 | ||
1da177e4 LT |
1100 | IP_VS_INFO("ipvs loaded.\n"); |
1101 | return ret; | |
1102 | ||
1da177e4 LT |
1103 | cleanup_conn: |
1104 | ip_vs_conn_cleanup(); | |
1105 | cleanup_app: | |
1106 | ip_vs_app_cleanup(); | |
1107 | cleanup_protocol: | |
1108 | ip_vs_protocol_cleanup(); | |
1109 | ip_vs_control_cleanup(); | |
1110 | cleanup_nothing: | |
1111 | return ret; | |
1112 | } | |
1113 | ||
1114 | static void __exit ip_vs_cleanup(void) | |
1115 | { | |
41c5b317 | 1116 | nf_unregister_hooks(ip_vs_ops, ARRAY_SIZE(ip_vs_ops)); |
1da177e4 LT |
1117 | ip_vs_conn_cleanup(); |
1118 | ip_vs_app_cleanup(); | |
1119 | ip_vs_protocol_cleanup(); | |
1120 | ip_vs_control_cleanup(); | |
1121 | IP_VS_INFO("ipvs unloaded.\n"); | |
1122 | } | |
1123 | ||
1124 | module_init(ip_vs_init); | |
1125 | module_exit(ip_vs_cleanup); | |
1126 | MODULE_LICENSE("GPL"); |