]>
Commit | Line | Data |
---|---|---|
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 | * | |
1da177e4 LT |
8 | * Authors: Wensong Zhang <wensong@linuxvirtualserver.org> |
9 | * Peter Kese <peter.kese@ijs.si> | |
10 | * Julian Anastasov <ja@ssi.bg> | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or | |
13 | * modify it under the terms of the GNU General Public License | |
14 | * as published by the Free Software Foundation; either version | |
15 | * 2 of the License, or (at your option) any later version. | |
16 | * | |
17 | * The IPVS code for kernel 2.2 was done by Wensong Zhang and Peter Kese, | |
18 | * with changes/fixes from Julian Anastasov, Lars Marowsky-Bree, Horms | |
19 | * and others. | |
20 | * | |
21 | * Changes: | |
22 | * Paul `Rusty' Russell properly handle non-linear skbs | |
6869c4d8 | 23 | * Harald Welte don't use nfcache |
1da177e4 LT |
24 | * |
25 | */ | |
26 | ||
9aada7ac HE |
27 | #define KMSG_COMPONENT "IPVS" |
28 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
29 | ||
1da177e4 LT |
30 | #include <linux/module.h> |
31 | #include <linux/kernel.h> | |
32 | #include <linux/ip.h> | |
33 | #include <linux/tcp.h> | |
2906f66a | 34 | #include <linux/sctp.h> |
1da177e4 | 35 | #include <linux/icmp.h> |
5a0e3ad6 | 36 | #include <linux/slab.h> |
1da177e4 LT |
37 | |
38 | #include <net/ip.h> | |
39 | #include <net/tcp.h> | |
40 | #include <net/udp.h> | |
41 | #include <net/icmp.h> /* for icmp_send */ | |
42 | #include <net/route.h> | |
43 | ||
44 | #include <linux/netfilter.h> | |
45 | #include <linux/netfilter_ipv4.h> | |
46 | ||
2a3b791e JV |
47 | #ifdef CONFIG_IP_VS_IPV6 |
48 | #include <net/ipv6.h> | |
49 | #include <linux/netfilter_ipv6.h> | |
50 | #endif | |
51 | ||
1da177e4 LT |
52 | #include <net/ip_vs.h> |
53 | ||
54 | ||
55 | EXPORT_SYMBOL(register_ip_vs_scheduler); | |
56 | EXPORT_SYMBOL(unregister_ip_vs_scheduler); | |
57 | EXPORT_SYMBOL(ip_vs_skb_replace); | |
58 | EXPORT_SYMBOL(ip_vs_proto_name); | |
59 | EXPORT_SYMBOL(ip_vs_conn_new); | |
60 | EXPORT_SYMBOL(ip_vs_conn_in_get); | |
61 | EXPORT_SYMBOL(ip_vs_conn_out_get); | |
62 | #ifdef CONFIG_IP_VS_PROTO_TCP | |
63 | EXPORT_SYMBOL(ip_vs_tcp_conn_listen); | |
64 | #endif | |
65 | EXPORT_SYMBOL(ip_vs_conn_put); | |
66 | #ifdef CONFIG_IP_VS_DEBUG | |
67 | EXPORT_SYMBOL(ip_vs_get_debug_level); | |
68 | #endif | |
1da177e4 LT |
69 | |
70 | ||
71 | /* ID used in ICMP lookups */ | |
72 | #define icmp_id(icmph) (((icmph)->un).echo.id) | |
2a3b791e | 73 | #define icmpv6_id(icmph) (icmph->icmp6_dataun.u_echo.identifier) |
1da177e4 LT |
74 | |
75 | const char *ip_vs_proto_name(unsigned proto) | |
76 | { | |
77 | static char buf[20]; | |
78 | ||
79 | switch (proto) { | |
80 | case IPPROTO_IP: | |
81 | return "IP"; | |
82 | case IPPROTO_UDP: | |
83 | return "UDP"; | |
84 | case IPPROTO_TCP: | |
85 | return "TCP"; | |
2906f66a VMR |
86 | case IPPROTO_SCTP: |
87 | return "SCTP"; | |
1da177e4 LT |
88 | case IPPROTO_ICMP: |
89 | return "ICMP"; | |
2a3b791e JV |
90 | #ifdef CONFIG_IP_VS_IPV6 |
91 | case IPPROTO_ICMPV6: | |
92 | return "ICMPv6"; | |
93 | #endif | |
1da177e4 LT |
94 | default: |
95 | sprintf(buf, "IP_%d", proto); | |
96 | return buf; | |
97 | } | |
98 | } | |
99 | ||
100 | void ip_vs_init_hash_table(struct list_head *table, int rows) | |
101 | { | |
102 | while (--rows >= 0) | |
103 | INIT_LIST_HEAD(&table[rows]); | |
104 | } | |
105 | ||
106 | static inline void | |
107 | ip_vs_in_stats(struct ip_vs_conn *cp, struct sk_buff *skb) | |
108 | { | |
109 | struct ip_vs_dest *dest = cp->dest; | |
110 | if (dest && (dest->flags & IP_VS_DEST_F_AVAILABLE)) { | |
111 | spin_lock(&dest->stats.lock); | |
e9c0ce23 SW |
112 | dest->stats.ustats.inpkts++; |
113 | dest->stats.ustats.inbytes += skb->len; | |
1da177e4 LT |
114 | spin_unlock(&dest->stats.lock); |
115 | ||
116 | spin_lock(&dest->svc->stats.lock); | |
e9c0ce23 SW |
117 | dest->svc->stats.ustats.inpkts++; |
118 | dest->svc->stats.ustats.inbytes += skb->len; | |
1da177e4 LT |
119 | spin_unlock(&dest->svc->stats.lock); |
120 | ||
121 | spin_lock(&ip_vs_stats.lock); | |
e9c0ce23 SW |
122 | ip_vs_stats.ustats.inpkts++; |
123 | ip_vs_stats.ustats.inbytes += skb->len; | |
1da177e4 LT |
124 | spin_unlock(&ip_vs_stats.lock); |
125 | } | |
126 | } | |
127 | ||
128 | ||
129 | static inline void | |
130 | ip_vs_out_stats(struct ip_vs_conn *cp, struct sk_buff *skb) | |
131 | { | |
132 | struct ip_vs_dest *dest = cp->dest; | |
133 | if (dest && (dest->flags & IP_VS_DEST_F_AVAILABLE)) { | |
134 | spin_lock(&dest->stats.lock); | |
e9c0ce23 SW |
135 | dest->stats.ustats.outpkts++; |
136 | dest->stats.ustats.outbytes += skb->len; | |
1da177e4 LT |
137 | spin_unlock(&dest->stats.lock); |
138 | ||
139 | spin_lock(&dest->svc->stats.lock); | |
e9c0ce23 SW |
140 | dest->svc->stats.ustats.outpkts++; |
141 | dest->svc->stats.ustats.outbytes += skb->len; | |
1da177e4 LT |
142 | spin_unlock(&dest->svc->stats.lock); |
143 | ||
144 | spin_lock(&ip_vs_stats.lock); | |
e9c0ce23 SW |
145 | ip_vs_stats.ustats.outpkts++; |
146 | ip_vs_stats.ustats.outbytes += skb->len; | |
1da177e4 LT |
147 | spin_unlock(&ip_vs_stats.lock); |
148 | } | |
149 | } | |
150 | ||
151 | ||
152 | static inline void | |
153 | ip_vs_conn_stats(struct ip_vs_conn *cp, struct ip_vs_service *svc) | |
154 | { | |
155 | spin_lock(&cp->dest->stats.lock); | |
e9c0ce23 | 156 | cp->dest->stats.ustats.conns++; |
1da177e4 LT |
157 | spin_unlock(&cp->dest->stats.lock); |
158 | ||
159 | spin_lock(&svc->stats.lock); | |
e9c0ce23 | 160 | svc->stats.ustats.conns++; |
1da177e4 LT |
161 | spin_unlock(&svc->stats.lock); |
162 | ||
163 | spin_lock(&ip_vs_stats.lock); | |
e9c0ce23 | 164 | ip_vs_stats.ustats.conns++; |
1da177e4 LT |
165 | spin_unlock(&ip_vs_stats.lock); |
166 | } | |
167 | ||
168 | ||
169 | static inline int | |
170 | ip_vs_set_state(struct ip_vs_conn *cp, int direction, | |
171 | const struct sk_buff *skb, | |
172 | struct ip_vs_protocol *pp) | |
173 | { | |
174 | if (unlikely(!pp->state_transition)) | |
175 | return 0; | |
176 | return pp->state_transition(cp, direction, skb, pp); | |
177 | } | |
178 | ||
179 | ||
1da177e4 LT |
180 | /* |
181 | * IPVS persistent scheduling function | |
182 | * It creates a connection entry according to its template if exists, | |
183 | * or selects a server and creates a connection entry plus a template. | |
184 | * Locking: we are svc user (svc->refcnt), so we hold all dests too | |
185 | * Protocols supported: TCP, UDP | |
186 | */ | |
187 | static struct ip_vs_conn * | |
188 | ip_vs_sched_persist(struct ip_vs_service *svc, | |
189 | const struct sk_buff *skb, | |
014d730d | 190 | __be16 ports[2]) |
1da177e4 LT |
191 | { |
192 | struct ip_vs_conn *cp = NULL; | |
28364a59 | 193 | struct ip_vs_iphdr iph; |
1da177e4 LT |
194 | struct ip_vs_dest *dest; |
195 | struct ip_vs_conn *ct; | |
cd17f9ed | 196 | __be16 dport; /* destination port to forward */ |
28364a59 JV |
197 | union nf_inet_addr snet; /* source network of the client, |
198 | after masking */ | |
cd17f9ed JV |
199 | |
200 | ip_vs_fill_iphdr(svc->af, skb_network_header(skb), &iph); | |
1da177e4 LT |
201 | |
202 | /* Mask saddr with the netmask to adjust template granularity */ | |
cd17f9ed JV |
203 | #ifdef CONFIG_IP_VS_IPV6 |
204 | if (svc->af == AF_INET6) | |
205 | ipv6_addr_prefix(&snet.in6, &iph.saddr.in6, svc->netmask); | |
206 | else | |
207 | #endif | |
208 | snet.ip = iph.saddr.ip & svc->netmask; | |
1da177e4 | 209 | |
cd17f9ed JV |
210 | IP_VS_DBG_BUF(6, "p-schedule: src %s:%u dest %s:%u " |
211 | "mnet %s\n", | |
212 | IP_VS_DBG_ADDR(svc->af, &iph.saddr), ntohs(ports[0]), | |
213 | IP_VS_DBG_ADDR(svc->af, &iph.daddr), ntohs(ports[1]), | |
214 | IP_VS_DBG_ADDR(svc->af, &snet)); | |
1da177e4 LT |
215 | |
216 | /* | |
217 | * As far as we know, FTP is a very complicated network protocol, and | |
218 | * it uses control connection and data connections. For active FTP, | |
219 | * FTP server initialize data connection to the client, its source port | |
220 | * is often 20. For passive FTP, FTP server tells the clients the port | |
221 | * that it passively listens to, and the client issues the data | |
222 | * connection. In the tunneling or direct routing mode, the load | |
223 | * balancer is on the client-to-server half of connection, the port | |
224 | * number is unknown to the load balancer. So, a conn template like | |
225 | * <caddr, 0, vaddr, 0, daddr, 0> is created for persistent FTP | |
226 | * service, and a template like <caddr, 0, vaddr, vport, daddr, dport> | |
227 | * is created for other persistent services. | |
228 | */ | |
229 | if (ports[1] == svc->port) { | |
230 | /* Check if a template already exists */ | |
231 | if (svc->port != FTPPORT) | |
cd17f9ed | 232 | ct = ip_vs_ct_in_get(svc->af, iph.protocol, &snet, 0, |
28364a59 | 233 | &iph.daddr, ports[1]); |
1da177e4 | 234 | else |
cd17f9ed | 235 | ct = ip_vs_ct_in_get(svc->af, iph.protocol, &snet, 0, |
28364a59 | 236 | &iph.daddr, 0); |
1da177e4 LT |
237 | |
238 | if (!ct || !ip_vs_check_template(ct)) { | |
239 | /* | |
240 | * No template found or the dest of the connection | |
241 | * template is not available. | |
242 | */ | |
243 | dest = svc->scheduler->schedule(svc, skb); | |
244 | if (dest == NULL) { | |
245 | IP_VS_DBG(1, "p-schedule: no dest found.\n"); | |
246 | return NULL; | |
247 | } | |
248 | ||
249 | /* | |
250 | * Create a template like <protocol,caddr,0, | |
251 | * vaddr,vport,daddr,dport> for non-ftp service, | |
252 | * and <protocol,caddr,0,vaddr,0,daddr,0> | |
253 | * for ftp service. | |
254 | */ | |
255 | if (svc->port != FTPPORT) | |
cd17f9ed | 256 | ct = ip_vs_conn_new(svc->af, iph.protocol, |
28364a59 JV |
257 | &snet, 0, |
258 | &iph.daddr, | |
1da177e4 | 259 | ports[1], |
28364a59 | 260 | &dest->addr, dest->port, |
87375ab4 | 261 | IP_VS_CONN_F_TEMPLATE, |
1da177e4 LT |
262 | dest); |
263 | else | |
cd17f9ed | 264 | ct = ip_vs_conn_new(svc->af, iph.protocol, |
28364a59 JV |
265 | &snet, 0, |
266 | &iph.daddr, 0, | |
267 | &dest->addr, 0, | |
87375ab4 | 268 | IP_VS_CONN_F_TEMPLATE, |
1da177e4 LT |
269 | dest); |
270 | if (ct == NULL) | |
271 | return NULL; | |
272 | ||
273 | ct->timeout = svc->timeout; | |
274 | } else { | |
275 | /* set destination with the found template */ | |
276 | dest = ct->dest; | |
277 | } | |
278 | dport = dest->port; | |
279 | } else { | |
280 | /* | |
281 | * Note: persistent fwmark-based services and persistent | |
282 | * port zero service are handled here. | |
283 | * fwmark template: <IPPROTO_IP,caddr,0,fwmark,0,daddr,0> | |
284 | * port zero template: <protocol,caddr,0,vaddr,0,daddr,0> | |
285 | */ | |
28364a59 JV |
286 | if (svc->fwmark) { |
287 | union nf_inet_addr fwmark = { | |
be8be9ec | 288 | .ip = htonl(svc->fwmark) |
28364a59 JV |
289 | }; |
290 | ||
cd17f9ed | 291 | ct = ip_vs_ct_in_get(svc->af, IPPROTO_IP, &snet, 0, |
28364a59 JV |
292 | &fwmark, 0); |
293 | } else | |
cd17f9ed | 294 | ct = ip_vs_ct_in_get(svc->af, iph.protocol, &snet, 0, |
28364a59 | 295 | &iph.daddr, 0); |
1da177e4 LT |
296 | |
297 | if (!ct || !ip_vs_check_template(ct)) { | |
298 | /* | |
299 | * If it is not persistent port zero, return NULL, | |
300 | * otherwise create a connection template. | |
301 | */ | |
302 | if (svc->port) | |
303 | return NULL; | |
304 | ||
305 | dest = svc->scheduler->schedule(svc, skb); | |
306 | if (dest == NULL) { | |
307 | IP_VS_DBG(1, "p-schedule: no dest found.\n"); | |
308 | return NULL; | |
309 | } | |
310 | ||
311 | /* | |
312 | * Create a template according to the service | |
313 | */ | |
28364a59 JV |
314 | if (svc->fwmark) { |
315 | union nf_inet_addr fwmark = { | |
be8be9ec | 316 | .ip = htonl(svc->fwmark) |
28364a59 JV |
317 | }; |
318 | ||
cd17f9ed | 319 | ct = ip_vs_conn_new(svc->af, IPPROTO_IP, |
28364a59 JV |
320 | &snet, 0, |
321 | &fwmark, 0, | |
322 | &dest->addr, 0, | |
87375ab4 | 323 | IP_VS_CONN_F_TEMPLATE, |
1da177e4 | 324 | dest); |
28364a59 | 325 | } else |
cd17f9ed | 326 | ct = ip_vs_conn_new(svc->af, iph.protocol, |
28364a59 JV |
327 | &snet, 0, |
328 | &iph.daddr, 0, | |
329 | &dest->addr, 0, | |
87375ab4 | 330 | IP_VS_CONN_F_TEMPLATE, |
1da177e4 LT |
331 | dest); |
332 | if (ct == NULL) | |
333 | return NULL; | |
334 | ||
335 | ct->timeout = svc->timeout; | |
336 | } else { | |
337 | /* set destination with the found template */ | |
338 | dest = ct->dest; | |
339 | } | |
340 | dport = ports[1]; | |
341 | } | |
342 | ||
343 | /* | |
344 | * Create a new connection according to the template | |
345 | */ | |
cd17f9ed | 346 | cp = ip_vs_conn_new(svc->af, iph.protocol, |
28364a59 JV |
347 | &iph.saddr, ports[0], |
348 | &iph.daddr, ports[1], | |
349 | &dest->addr, dport, | |
1da177e4 LT |
350 | 0, |
351 | dest); | |
352 | if (cp == NULL) { | |
353 | ip_vs_conn_put(ct); | |
354 | return NULL; | |
355 | } | |
356 | ||
357 | /* | |
358 | * Add its control | |
359 | */ | |
360 | ip_vs_control_add(cp, ct); | |
361 | ip_vs_conn_put(ct); | |
362 | ||
363 | ip_vs_conn_stats(cp, svc); | |
364 | return cp; | |
365 | } | |
366 | ||
367 | ||
368 | /* | |
369 | * IPVS main scheduling function | |
370 | * It selects a server according to the virtual service, and | |
371 | * creates a connection entry. | |
372 | * Protocols supported: TCP, UDP | |
373 | */ | |
374 | struct ip_vs_conn * | |
375 | ip_vs_schedule(struct ip_vs_service *svc, const struct sk_buff *skb) | |
376 | { | |
377 | struct ip_vs_conn *cp = NULL; | |
28364a59 | 378 | struct ip_vs_iphdr iph; |
1da177e4 | 379 | struct ip_vs_dest *dest; |
014d730d | 380 | __be16 _ports[2], *pptr; |
1da177e4 | 381 | |
28364a59 JV |
382 | ip_vs_fill_iphdr(svc->af, skb_network_header(skb), &iph); |
383 | pptr = skb_header_pointer(skb, iph.len, sizeof(_ports), _ports); | |
1da177e4 LT |
384 | if (pptr == NULL) |
385 | return NULL; | |
386 | ||
387 | /* | |
388 | * Persistent service | |
389 | */ | |
390 | if (svc->flags & IP_VS_SVC_F_PERSISTENT) | |
391 | return ip_vs_sched_persist(svc, skb, pptr); | |
392 | ||
393 | /* | |
394 | * Non-persistent service | |
395 | */ | |
396 | if (!svc->fwmark && pptr[1] != svc->port) { | |
397 | if (!svc->port) | |
1e3e238e HE |
398 | pr_err("Schedule: port zero only supported " |
399 | "in persistent services, " | |
400 | "check your ipvs configuration\n"); | |
1da177e4 LT |
401 | return NULL; |
402 | } | |
403 | ||
404 | dest = svc->scheduler->schedule(svc, skb); | |
405 | if (dest == NULL) { | |
406 | IP_VS_DBG(1, "Schedule: no dest found.\n"); | |
407 | return NULL; | |
408 | } | |
409 | ||
410 | /* | |
411 | * Create a connection entry. | |
412 | */ | |
cd17f9ed | 413 | cp = ip_vs_conn_new(svc->af, iph.protocol, |
28364a59 JV |
414 | &iph.saddr, pptr[0], |
415 | &iph.daddr, pptr[1], | |
416 | &dest->addr, dest->port ? dest->port : pptr[1], | |
1da177e4 LT |
417 | 0, |
418 | dest); | |
419 | if (cp == NULL) | |
420 | return NULL; | |
421 | ||
cd17f9ed JV |
422 | IP_VS_DBG_BUF(6, "Schedule fwd:%c c:%s:%u v:%s:%u " |
423 | "d:%s:%u conn->flags:%X conn->refcnt:%d\n", | |
424 | ip_vs_fwd_tag(cp), | |
425 | IP_VS_DBG_ADDR(svc->af, &cp->caddr), ntohs(cp->cport), | |
426 | IP_VS_DBG_ADDR(svc->af, &cp->vaddr), ntohs(cp->vport), | |
427 | IP_VS_DBG_ADDR(svc->af, &cp->daddr), ntohs(cp->dport), | |
428 | cp->flags, atomic_read(&cp->refcnt)); | |
1da177e4 LT |
429 | |
430 | ip_vs_conn_stats(cp, svc); | |
431 | return cp; | |
432 | } | |
433 | ||
434 | ||
435 | /* | |
436 | * Pass or drop the packet. | |
437 | * Called by ip_vs_in, when the virtual service is available but | |
438 | * no destination is available for a new connection. | |
439 | */ | |
440 | int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb, | |
441 | struct ip_vs_protocol *pp) | |
442 | { | |
014d730d | 443 | __be16 _ports[2], *pptr; |
28364a59 | 444 | struct ip_vs_iphdr iph; |
2a3b791e JV |
445 | int unicast; |
446 | ip_vs_fill_iphdr(svc->af, skb_network_header(skb), &iph); | |
1da177e4 | 447 | |
28364a59 | 448 | pptr = skb_header_pointer(skb, iph.len, sizeof(_ports), _ports); |
1da177e4 LT |
449 | if (pptr == NULL) { |
450 | ip_vs_service_put(svc); | |
451 | return NF_DROP; | |
452 | } | |
453 | ||
2a3b791e JV |
454 | #ifdef CONFIG_IP_VS_IPV6 |
455 | if (svc->af == AF_INET6) | |
456 | unicast = ipv6_addr_type(&iph.daddr.in6) & IPV6_ADDR_UNICAST; | |
457 | else | |
458 | #endif | |
459 | unicast = (inet_addr_type(&init_net, iph.daddr.ip) == RTN_UNICAST); | |
460 | ||
1da177e4 | 461 | /* if it is fwmark-based service, the cache_bypass sysctl is up |
2a3b791e | 462 | and the destination is a non-local unicast, then create |
1da177e4 | 463 | a cache_bypass connection entry */ |
2a3b791e | 464 | if (sysctl_ip_vs_cache_bypass && svc->fwmark && unicast) { |
1da177e4 LT |
465 | int ret, cs; |
466 | struct ip_vs_conn *cp; | |
dff630dd | 467 | union nf_inet_addr daddr = { .all = { 0, 0, 0, 0 } }; |
1da177e4 LT |
468 | |
469 | ip_vs_service_put(svc); | |
470 | ||
471 | /* create a new connection entry */ | |
1e3e238e | 472 | IP_VS_DBG(6, "%s(): create a cache_bypass entry\n", __func__); |
2a3b791e | 473 | cp = ip_vs_conn_new(svc->af, iph.protocol, |
28364a59 JV |
474 | &iph.saddr, pptr[0], |
475 | &iph.daddr, pptr[1], | |
dff630dd | 476 | &daddr, 0, |
1da177e4 LT |
477 | IP_VS_CONN_F_BYPASS, |
478 | NULL); | |
479 | if (cp == NULL) | |
480 | return NF_DROP; | |
481 | ||
482 | /* statistics */ | |
483 | ip_vs_in_stats(cp, skb); | |
484 | ||
485 | /* set state */ | |
486 | cs = ip_vs_set_state(cp, IP_VS_DIR_INPUT, skb, pp); | |
487 | ||
488 | /* transmit the first SYN packet */ | |
489 | ret = cp->packet_xmit(skb, cp, pp); | |
490 | /* do not touch skb anymore */ | |
491 | ||
492 | atomic_inc(&cp->in_pkts); | |
493 | ip_vs_conn_put(cp); | |
494 | return ret; | |
495 | } | |
496 | ||
497 | /* | |
498 | * When the virtual ftp service is presented, packets destined | |
499 | * for other services on the VIP may get here (except services | |
500 | * listed in the ipvs table), pass the packets, because it is | |
501 | * not ipvs job to decide to drop the packets. | |
502 | */ | |
503 | if ((svc->port == FTPPORT) && (pptr[1] != FTPPORT)) { | |
504 | ip_vs_service_put(svc); | |
505 | return NF_ACCEPT; | |
506 | } | |
507 | ||
508 | ip_vs_service_put(svc); | |
509 | ||
510 | /* | |
511 | * Notify the client that the destination is unreachable, and | |
512 | * release the socket buffer. | |
513 | * Since it is in IP layer, the TCP socket is not actually | |
514 | * created, the TCP RST packet cannot be sent, instead that | |
515 | * ICMP_PORT_UNREACH is sent here no matter it is TCP/UDP. --WZ | |
516 | */ | |
2a3b791e JV |
517 | #ifdef CONFIG_IP_VS_IPV6 |
518 | if (svc->af == AF_INET6) | |
3ffe533c | 519 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); |
2a3b791e JV |
520 | else |
521 | #endif | |
522 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); | |
523 | ||
1da177e4 LT |
524 | return NF_DROP; |
525 | } | |
526 | ||
527 | ||
528 | /* | |
6e23ae2a | 529 | * It is hooked before NF_IP_PRI_NAT_SRC at the NF_INET_POST_ROUTING |
1da177e4 LT |
530 | * chain, and is used for VS/NAT. |
531 | * It detects packets for VS/NAT connections and sends the packets | |
532 | * immediately. This can avoid that iptable_nat mangles the packets | |
533 | * for VS/NAT. | |
534 | */ | |
535 | static unsigned int ip_vs_post_routing(unsigned int hooknum, | |
3db05fea | 536 | struct sk_buff *skb, |
1da177e4 LT |
537 | const struct net_device *in, |
538 | const struct net_device *out, | |
539 | int (*okfn)(struct sk_buff *)) | |
540 | { | |
3db05fea | 541 | if (!skb->ipvs_property) |
1da177e4 | 542 | return NF_ACCEPT; |
1da177e4 | 543 | /* The packet was sent from IPVS, exit this chain */ |
abbcc739 | 544 | return NF_STOP; |
1da177e4 LT |
545 | } |
546 | ||
b1550f22 | 547 | __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset) |
1da177e4 | 548 | { |
d3bc23e7 | 549 | return csum_fold(skb_checksum(skb, offset, skb->len - offset, 0)); |
1da177e4 LT |
550 | } |
551 | ||
776c729e | 552 | static inline int ip_vs_gather_frags(struct sk_buff *skb, u_int32_t user) |
1da177e4 | 553 | { |
776c729e HX |
554 | int err = ip_defrag(skb, user); |
555 | ||
556 | if (!err) | |
eddc9ec5 | 557 | ip_send_check(ip_hdr(skb)); |
776c729e HX |
558 | |
559 | return err; | |
1da177e4 LT |
560 | } |
561 | ||
2a3b791e JV |
562 | #ifdef CONFIG_IP_VS_IPV6 |
563 | static inline int ip_vs_gather_frags_v6(struct sk_buff *skb, u_int32_t user) | |
564 | { | |
565 | /* TODO IPv6: Find out what to do here for IPv6 */ | |
566 | return 0; | |
567 | } | |
568 | #endif | |
569 | ||
1da177e4 LT |
570 | /* |
571 | * Packet has been made sufficiently writable in caller | |
572 | * - inout: 1=in->out, 0=out->in | |
573 | */ | |
574 | void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp, | |
575 | struct ip_vs_conn *cp, int inout) | |
576 | { | |
eddc9ec5 | 577 | struct iphdr *iph = ip_hdr(skb); |
1da177e4 | 578 | unsigned int icmp_offset = iph->ihl*4; |
d56f90a7 ACM |
579 | struct icmphdr *icmph = (struct icmphdr *)(skb_network_header(skb) + |
580 | icmp_offset); | |
1da177e4 LT |
581 | struct iphdr *ciph = (struct iphdr *)(icmph + 1); |
582 | ||
583 | if (inout) { | |
e7ade46a | 584 | iph->saddr = cp->vaddr.ip; |
1da177e4 | 585 | ip_send_check(iph); |
e7ade46a | 586 | ciph->daddr = cp->vaddr.ip; |
1da177e4 LT |
587 | ip_send_check(ciph); |
588 | } else { | |
e7ade46a | 589 | iph->daddr = cp->daddr.ip; |
1da177e4 | 590 | ip_send_check(iph); |
e7ade46a | 591 | ciph->saddr = cp->daddr.ip; |
1da177e4 LT |
592 | ip_send_check(ciph); |
593 | } | |
594 | ||
2906f66a VMR |
595 | /* the TCP/UDP/SCTP port */ |
596 | if (IPPROTO_TCP == ciph->protocol || IPPROTO_UDP == ciph->protocol || | |
597 | IPPROTO_SCTP == ciph->protocol) { | |
014d730d | 598 | __be16 *ports = (void *)ciph + ciph->ihl*4; |
1da177e4 LT |
599 | |
600 | if (inout) | |
601 | ports[1] = cp->vport; | |
602 | else | |
603 | ports[0] = cp->dport; | |
604 | } | |
605 | ||
606 | /* And finally the ICMP checksum */ | |
607 | icmph->checksum = 0; | |
608 | icmph->checksum = ip_vs_checksum_complete(skb, icmp_offset); | |
609 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
610 | ||
611 | if (inout) | |
612 | IP_VS_DBG_PKT(11, pp, skb, (void *)ciph - (void *)iph, | |
613 | "Forwarding altered outgoing ICMP"); | |
614 | else | |
615 | IP_VS_DBG_PKT(11, pp, skb, (void *)ciph - (void *)iph, | |
616 | "Forwarding altered incoming ICMP"); | |
617 | } | |
618 | ||
b3cdd2a7 JV |
619 | #ifdef CONFIG_IP_VS_IPV6 |
620 | void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp, | |
621 | struct ip_vs_conn *cp, int inout) | |
622 | { | |
623 | struct ipv6hdr *iph = ipv6_hdr(skb); | |
624 | unsigned int icmp_offset = sizeof(struct ipv6hdr); | |
625 | struct icmp6hdr *icmph = (struct icmp6hdr *)(skb_network_header(skb) + | |
626 | icmp_offset); | |
627 | struct ipv6hdr *ciph = (struct ipv6hdr *)(icmph + 1); | |
628 | ||
629 | if (inout) { | |
630 | iph->saddr = cp->vaddr.in6; | |
631 | ciph->daddr = cp->vaddr.in6; | |
632 | } else { | |
633 | iph->daddr = cp->daddr.in6; | |
634 | ciph->saddr = cp->daddr.in6; | |
635 | } | |
636 | ||
2906f66a VMR |
637 | /* the TCP/UDP/SCTP port */ |
638 | if (IPPROTO_TCP == ciph->nexthdr || IPPROTO_UDP == ciph->nexthdr || | |
639 | IPPROTO_SCTP == ciph->nexthdr) { | |
b3cdd2a7 JV |
640 | __be16 *ports = (void *)ciph + sizeof(struct ipv6hdr); |
641 | ||
642 | if (inout) | |
643 | ports[1] = cp->vport; | |
644 | else | |
645 | ports[0] = cp->dport; | |
646 | } | |
647 | ||
648 | /* And finally the ICMP checksum */ | |
649 | icmph->icmp6_cksum = 0; | |
650 | /* TODO IPv6: is this correct for ICMPv6? */ | |
651 | ip_vs_checksum_complete(skb, icmp_offset); | |
652 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
653 | ||
654 | if (inout) | |
655 | IP_VS_DBG_PKT(11, pp, skb, (void *)ciph - (void *)iph, | |
656 | "Forwarding altered outgoing ICMPv6"); | |
657 | else | |
658 | IP_VS_DBG_PKT(11, pp, skb, (void *)ciph - (void *)iph, | |
659 | "Forwarding altered incoming ICMPv6"); | |
660 | } | |
661 | #endif | |
662 | ||
4856c84c MT |
663 | /* Handle relevant response ICMP messages - forward to the right |
664 | * destination host. Used for NAT and local client. | |
665 | */ | |
f2428ed5 SH |
666 | static int handle_response_icmp(int af, struct sk_buff *skb, |
667 | union nf_inet_addr *snet, | |
668 | __u8 protocol, struct ip_vs_conn *cp, | |
4856c84c MT |
669 | struct ip_vs_protocol *pp, |
670 | unsigned int offset, unsigned int ihl) | |
671 | { | |
672 | unsigned int verdict = NF_DROP; | |
673 | ||
674 | if (IP_VS_FWD_METHOD(cp) != 0) { | |
1e3e238e HE |
675 | pr_err("shouldn't reach here, because the box is on the " |
676 | "half connection in the tun/dr module.\n"); | |
4856c84c MT |
677 | } |
678 | ||
679 | /* Ensure the checksum is correct */ | |
680 | if (!skb_csum_unnecessary(skb) && ip_vs_checksum_complete(skb, ihl)) { | |
681 | /* Failed checksum! */ | |
f2428ed5 SH |
682 | IP_VS_DBG_BUF(1, "Forward ICMP: failed checksum from %s!\n", |
683 | IP_VS_DBG_ADDR(af, snet)); | |
4856c84c MT |
684 | goto out; |
685 | } | |
686 | ||
2906f66a VMR |
687 | if (IPPROTO_TCP == protocol || IPPROTO_UDP == protocol || |
688 | IPPROTO_SCTP == protocol) | |
4856c84c MT |
689 | offset += 2 * sizeof(__u16); |
690 | if (!skb_make_writable(skb, offset)) | |
691 | goto out; | |
692 | ||
f2428ed5 SH |
693 | #ifdef CONFIG_IP_VS_IPV6 |
694 | if (af == AF_INET6) | |
695 | ip_vs_nat_icmp_v6(skb, pp, cp, 1); | |
696 | else | |
697 | #endif | |
698 | ip_vs_nat_icmp(skb, pp, cp, 1); | |
4856c84c MT |
699 | |
700 | /* do the statistics and put it back */ | |
701 | ip_vs_out_stats(cp, skb); | |
702 | ||
703 | skb->ipvs_property = 1; | |
704 | verdict = NF_ACCEPT; | |
705 | ||
706 | out: | |
707 | __ip_vs_conn_put(cp); | |
708 | ||
709 | return verdict; | |
710 | } | |
711 | ||
1da177e4 LT |
712 | /* |
713 | * Handle ICMP messages in the inside-to-outside direction (outgoing). | |
4856c84c | 714 | * Find any that might be relevant, check against existing connections. |
1da177e4 | 715 | * Currently handles error types - unreachable, quench, ttl exceeded. |
1da177e4 | 716 | */ |
3db05fea | 717 | static int ip_vs_out_icmp(struct sk_buff *skb, int *related) |
1da177e4 | 718 | { |
1da177e4 LT |
719 | struct iphdr *iph; |
720 | struct icmphdr _icmph, *ic; | |
721 | struct iphdr _ciph, *cih; /* The ip header contained within the ICMP */ | |
51ef348b | 722 | struct ip_vs_iphdr ciph; |
1da177e4 LT |
723 | struct ip_vs_conn *cp; |
724 | struct ip_vs_protocol *pp; | |
4856c84c | 725 | unsigned int offset, ihl; |
f2428ed5 | 726 | union nf_inet_addr snet; |
1da177e4 LT |
727 | |
728 | *related = 1; | |
729 | ||
730 | /* reassemble IP fragments */ | |
eddc9ec5 | 731 | if (ip_hdr(skb)->frag_off & htons(IP_MF | IP_OFFSET)) { |
776c729e | 732 | if (ip_vs_gather_frags(skb, IP_DEFRAG_VS_OUT)) |
1da177e4 | 733 | return NF_STOLEN; |
1da177e4 LT |
734 | } |
735 | ||
eddc9ec5 | 736 | iph = ip_hdr(skb); |
1da177e4 LT |
737 | offset = ihl = iph->ihl * 4; |
738 | ic = skb_header_pointer(skb, offset, sizeof(_icmph), &_icmph); | |
739 | if (ic == NULL) | |
740 | return NF_DROP; | |
741 | ||
14d5e834 | 742 | IP_VS_DBG(12, "Outgoing ICMP (%d,%d) %pI4->%pI4\n", |
1da177e4 | 743 | ic->type, ntohs(icmp_id(ic)), |
14d5e834 | 744 | &iph->saddr, &iph->daddr); |
1da177e4 LT |
745 | |
746 | /* | |
747 | * Work through seeing if this is for us. | |
748 | * These checks are supposed to be in an order that means easy | |
749 | * things are checked first to speed up processing.... however | |
750 | * this means that some packets will manage to get a long way | |
751 | * down this stack and then be rejected, but that's life. | |
752 | */ | |
753 | if ((ic->type != ICMP_DEST_UNREACH) && | |
754 | (ic->type != ICMP_SOURCE_QUENCH) && | |
755 | (ic->type != ICMP_TIME_EXCEEDED)) { | |
756 | *related = 0; | |
757 | return NF_ACCEPT; | |
758 | } | |
759 | ||
760 | /* Now find the contained IP header */ | |
761 | offset += sizeof(_icmph); | |
762 | cih = skb_header_pointer(skb, offset, sizeof(_ciph), &_ciph); | |
763 | if (cih == NULL) | |
764 | return NF_ACCEPT; /* The packet looks wrong, ignore */ | |
765 | ||
766 | pp = ip_vs_proto_get(cih->protocol); | |
767 | if (!pp) | |
768 | return NF_ACCEPT; | |
769 | ||
770 | /* Is the embedded protocol header present? */ | |
4412ec49 | 771 | if (unlikely(cih->frag_off & htons(IP_OFFSET) && |
1da177e4 LT |
772 | pp->dont_defrag)) |
773 | return NF_ACCEPT; | |
774 | ||
775 | IP_VS_DBG_PKT(11, pp, skb, offset, "Checking outgoing ICMP for"); | |
776 | ||
777 | offset += cih->ihl * 4; | |
778 | ||
51ef348b | 779 | ip_vs_fill_iphdr(AF_INET, cih, &ciph); |
1da177e4 | 780 | /* The embedded headers contain source and dest in reverse order */ |
51ef348b | 781 | cp = pp->conn_out_get(AF_INET, skb, pp, &ciph, offset, 1); |
1da177e4 LT |
782 | if (!cp) |
783 | return NF_ACCEPT; | |
784 | ||
f2428ed5 SH |
785 | snet.ip = iph->saddr; |
786 | return handle_response_icmp(AF_INET, skb, &snet, cih->protocol, cp, | |
787 | pp, offset, ihl); | |
1da177e4 LT |
788 | } |
789 | ||
2a3b791e JV |
790 | #ifdef CONFIG_IP_VS_IPV6 |
791 | static int ip_vs_out_icmp_v6(struct sk_buff *skb, int *related) | |
792 | { | |
793 | struct ipv6hdr *iph; | |
794 | struct icmp6hdr _icmph, *ic; | |
795 | struct ipv6hdr _ciph, *cih; /* The ip header contained | |
796 | within the ICMP */ | |
797 | struct ip_vs_iphdr ciph; | |
798 | struct ip_vs_conn *cp; | |
799 | struct ip_vs_protocol *pp; | |
f2428ed5 SH |
800 | unsigned int offset; |
801 | union nf_inet_addr snet; | |
2a3b791e JV |
802 | |
803 | *related = 1; | |
804 | ||
805 | /* reassemble IP fragments */ | |
806 | if (ipv6_hdr(skb)->nexthdr == IPPROTO_FRAGMENT) { | |
807 | if (ip_vs_gather_frags_v6(skb, IP_DEFRAG_VS_OUT)) | |
808 | return NF_STOLEN; | |
809 | } | |
810 | ||
811 | iph = ipv6_hdr(skb); | |
812 | offset = sizeof(struct ipv6hdr); | |
813 | ic = skb_header_pointer(skb, offset, sizeof(_icmph), &_icmph); | |
814 | if (ic == NULL) | |
815 | return NF_DROP; | |
816 | ||
5b095d98 | 817 | IP_VS_DBG(12, "Outgoing ICMPv6 (%d,%d) %pI6->%pI6\n", |
2a3b791e | 818 | ic->icmp6_type, ntohs(icmpv6_id(ic)), |
38ff4fa4 | 819 | &iph->saddr, &iph->daddr); |
2a3b791e JV |
820 | |
821 | /* | |
822 | * Work through seeing if this is for us. | |
823 | * These checks are supposed to be in an order that means easy | |
824 | * things are checked first to speed up processing.... however | |
825 | * this means that some packets will manage to get a long way | |
826 | * down this stack and then be rejected, but that's life. | |
827 | */ | |
828 | if ((ic->icmp6_type != ICMPV6_DEST_UNREACH) && | |
829 | (ic->icmp6_type != ICMPV6_PKT_TOOBIG) && | |
830 | (ic->icmp6_type != ICMPV6_TIME_EXCEED)) { | |
831 | *related = 0; | |
832 | return NF_ACCEPT; | |
833 | } | |
834 | ||
835 | /* Now find the contained IP header */ | |
836 | offset += sizeof(_icmph); | |
837 | cih = skb_header_pointer(skb, offset, sizeof(_ciph), &_ciph); | |
838 | if (cih == NULL) | |
839 | return NF_ACCEPT; /* The packet looks wrong, ignore */ | |
840 | ||
841 | pp = ip_vs_proto_get(cih->nexthdr); | |
842 | if (!pp) | |
843 | return NF_ACCEPT; | |
844 | ||
845 | /* Is the embedded protocol header present? */ | |
846 | /* TODO: we don't support fragmentation at the moment anyways */ | |
847 | if (unlikely(cih->nexthdr == IPPROTO_FRAGMENT && pp->dont_defrag)) | |
848 | return NF_ACCEPT; | |
849 | ||
850 | IP_VS_DBG_PKT(11, pp, skb, offset, "Checking outgoing ICMPv6 for"); | |
851 | ||
852 | offset += sizeof(struct ipv6hdr); | |
853 | ||
854 | ip_vs_fill_iphdr(AF_INET6, cih, &ciph); | |
855 | /* The embedded headers contain source and dest in reverse order */ | |
856 | cp = pp->conn_out_get(AF_INET6, skb, pp, &ciph, offset, 1); | |
857 | if (!cp) | |
858 | return NF_ACCEPT; | |
859 | ||
178f5e49 | 860 | ipv6_addr_copy(&snet.in6, &iph->saddr); |
f2428ed5 SH |
861 | return handle_response_icmp(AF_INET6, skb, &snet, cih->nexthdr, cp, |
862 | pp, offset, sizeof(struct ipv6hdr)); | |
2a3b791e JV |
863 | } |
864 | #endif | |
865 | ||
2906f66a VMR |
866 | /* |
867 | * Check if sctp chunc is ABORT chunk | |
868 | */ | |
869 | static inline int is_sctp_abort(const struct sk_buff *skb, int nh_len) | |
870 | { | |
871 | sctp_chunkhdr_t *sch, schunk; | |
872 | sch = skb_header_pointer(skb, nh_len + sizeof(sctp_sctphdr_t), | |
873 | sizeof(schunk), &schunk); | |
874 | if (sch == NULL) | |
875 | return 0; | |
876 | if (sch->type == SCTP_CID_ABORT) | |
877 | return 1; | |
878 | return 0; | |
879 | } | |
880 | ||
2a3b791e | 881 | static inline int is_tcp_reset(const struct sk_buff *skb, int nh_len) |
1da177e4 LT |
882 | { |
883 | struct tcphdr _tcph, *th; | |
884 | ||
2a3b791e | 885 | th = skb_header_pointer(skb, nh_len, sizeof(_tcph), &_tcph); |
1da177e4 LT |
886 | if (th == NULL) |
887 | return 0; | |
888 | return th->rst; | |
889 | } | |
890 | ||
4856c84c MT |
891 | /* Handle response packets: rewrite addresses and send away... |
892 | * Used for NAT and local client. | |
893 | */ | |
894 | static unsigned int | |
895 | handle_response(int af, struct sk_buff *skb, struct ip_vs_protocol *pp, | |
896 | struct ip_vs_conn *cp, int ihl) | |
897 | { | |
898 | IP_VS_DBG_PKT(11, pp, skb, 0, "Outgoing packet"); | |
899 | ||
900 | if (!skb_make_writable(skb, ihl)) | |
901 | goto drop; | |
902 | ||
903 | /* mangle the packet */ | |
904 | if (pp->snat_handler && !pp->snat_handler(skb, pp, cp)) | |
905 | goto drop; | |
906 | ||
907 | #ifdef CONFIG_IP_VS_IPV6 | |
908 | if (af == AF_INET6) | |
909 | ipv6_hdr(skb)->saddr = cp->vaddr.in6; | |
910 | else | |
911 | #endif | |
912 | { | |
913 | ip_hdr(skb)->saddr = cp->vaddr.ip; | |
914 | ip_send_check(ip_hdr(skb)); | |
915 | } | |
916 | ||
917 | /* For policy routing, packets originating from this | |
918 | * machine itself may be routed differently to packets | |
919 | * passing through. We want this packet to be routed as | |
920 | * if it came from this machine itself. So re-compute | |
921 | * the routing information. | |
922 | */ | |
923 | #ifdef CONFIG_IP_VS_IPV6 | |
924 | if (af == AF_INET6) { | |
925 | if (ip6_route_me_harder(skb) != 0) | |
926 | goto drop; | |
927 | } else | |
928 | #endif | |
929 | if (ip_route_me_harder(skb, RTN_LOCAL) != 0) | |
930 | goto drop; | |
931 | ||
4856c84c MT |
932 | IP_VS_DBG_PKT(10, pp, skb, 0, "After SNAT"); |
933 | ||
934 | ip_vs_out_stats(cp, skb); | |
935 | ip_vs_set_state(cp, IP_VS_DIR_OUTPUT, skb, pp); | |
936 | ip_vs_conn_put(cp); | |
937 | ||
938 | skb->ipvs_property = 1; | |
939 | ||
940 | LeaveFunction(11); | |
941 | return NF_ACCEPT; | |
942 | ||
943 | drop: | |
944 | ip_vs_conn_put(cp); | |
945 | kfree_skb(skb); | |
946 | return NF_STOLEN; | |
947 | } | |
948 | ||
1da177e4 | 949 | /* |
6e23ae2a | 950 | * It is hooked at the NF_INET_FORWARD chain, used only for VS/NAT. |
4856c84c | 951 | * Check if outgoing packet belongs to the established ip_vs_conn. |
1da177e4 LT |
952 | */ |
953 | static unsigned int | |
3db05fea | 954 | ip_vs_out(unsigned int hooknum, struct sk_buff *skb, |
1da177e4 LT |
955 | const struct net_device *in, const struct net_device *out, |
956 | int (*okfn)(struct sk_buff *)) | |
957 | { | |
51ef348b | 958 | struct ip_vs_iphdr iph; |
1da177e4 LT |
959 | struct ip_vs_protocol *pp; |
960 | struct ip_vs_conn *cp; | |
2a3b791e | 961 | int af; |
1da177e4 LT |
962 | |
963 | EnterFunction(11); | |
964 | ||
60678040 | 965 | af = (skb->protocol == htons(ETH_P_IP)) ? AF_INET : AF_INET6; |
2a3b791e | 966 | |
6869c4d8 | 967 | if (skb->ipvs_property) |
1da177e4 LT |
968 | return NF_ACCEPT; |
969 | ||
2a3b791e JV |
970 | ip_vs_fill_iphdr(af, skb_network_header(skb), &iph); |
971 | #ifdef CONFIG_IP_VS_IPV6 | |
972 | if (af == AF_INET6) { | |
973 | if (unlikely(iph.protocol == IPPROTO_ICMPV6)) { | |
974 | int related, verdict = ip_vs_out_icmp_v6(skb, &related); | |
1da177e4 | 975 | |
2a3b791e JV |
976 | if (related) |
977 | return verdict; | |
978 | ip_vs_fill_iphdr(af, skb_network_header(skb), &iph); | |
979 | } | |
980 | } else | |
981 | #endif | |
982 | if (unlikely(iph.protocol == IPPROTO_ICMP)) { | |
983 | int related, verdict = ip_vs_out_icmp(skb, &related); | |
984 | ||
985 | if (related) | |
986 | return verdict; | |
987 | ip_vs_fill_iphdr(af, skb_network_header(skb), &iph); | |
988 | } | |
1da177e4 | 989 | |
51ef348b | 990 | pp = ip_vs_proto_get(iph.protocol); |
1da177e4 LT |
991 | if (unlikely(!pp)) |
992 | return NF_ACCEPT; | |
993 | ||
994 | /* reassemble IP fragments */ | |
2a3b791e JV |
995 | #ifdef CONFIG_IP_VS_IPV6 |
996 | if (af == AF_INET6) { | |
997 | if (unlikely(iph.protocol == IPPROTO_ICMPV6)) { | |
998 | int related, verdict = ip_vs_out_icmp_v6(skb, &related); | |
1da177e4 | 999 | |
2a3b791e JV |
1000 | if (related) |
1001 | return verdict; | |
1002 | ||
1003 | ip_vs_fill_iphdr(af, skb_network_header(skb), &iph); | |
1004 | } | |
1005 | } else | |
1006 | #endif | |
1007 | if (unlikely(ip_hdr(skb)->frag_off & htons(IP_MF|IP_OFFSET) && | |
1008 | !pp->dont_defrag)) { | |
1009 | if (ip_vs_gather_frags(skb, IP_DEFRAG_VS_OUT)) | |
1010 | return NF_STOLEN; | |
1011 | ||
1012 | ip_vs_fill_iphdr(af, skb_network_header(skb), &iph); | |
1013 | } | |
1da177e4 LT |
1014 | |
1015 | /* | |
1016 | * Check if the packet belongs to an existing entry | |
1017 | */ | |
2a3b791e | 1018 | cp = pp->conn_out_get(af, skb, pp, &iph, iph.len, 0); |
1da177e4 LT |
1019 | |
1020 | if (unlikely(!cp)) { | |
1021 | if (sysctl_ip_vs_nat_icmp_send && | |
1022 | (pp->protocol == IPPROTO_TCP || | |
2906f66a VMR |
1023 | pp->protocol == IPPROTO_UDP || |
1024 | pp->protocol == IPPROTO_SCTP)) { | |
014d730d | 1025 | __be16 _ports[2], *pptr; |
1da177e4 | 1026 | |
51ef348b | 1027 | pptr = skb_header_pointer(skb, iph.len, |
1da177e4 LT |
1028 | sizeof(_ports), _ports); |
1029 | if (pptr == NULL) | |
1030 | return NF_ACCEPT; /* Not for me */ | |
7937df15 JV |
1031 | if (ip_vs_lookup_real_service(af, iph.protocol, |
1032 | &iph.saddr, | |
2a3b791e | 1033 | pptr[0])) { |
1da177e4 LT |
1034 | /* |
1035 | * Notify the real server: there is no | |
1036 | * existing entry if it is not RST | |
1037 | * packet or not TCP packet. | |
1038 | */ | |
2906f66a VMR |
1039 | if ((iph.protocol != IPPROTO_TCP && |
1040 | iph.protocol != IPPROTO_SCTP) | |
1041 | || ((iph.protocol == IPPROTO_TCP | |
1042 | && !is_tcp_reset(skb, iph.len)) | |
1043 | || (iph.protocol == IPPROTO_SCTP | |
1044 | && !is_sctp_abort(skb, | |
1045 | iph.len)))) { | |
2a3b791e JV |
1046 | #ifdef CONFIG_IP_VS_IPV6 |
1047 | if (af == AF_INET6) | |
1048 | icmpv6_send(skb, | |
1049 | ICMPV6_DEST_UNREACH, | |
1050 | ICMPV6_PORT_UNREACH, | |
3ffe533c | 1051 | 0); |
2a3b791e JV |
1052 | else |
1053 | #endif | |
1054 | icmp_send(skb, | |
1055 | ICMP_DEST_UNREACH, | |
1056 | ICMP_PORT_UNREACH, 0); | |
1da177e4 | 1057 | return NF_DROP; |
5af149cc | 1058 | } |
1da177e4 LT |
1059 | } |
1060 | } | |
1061 | IP_VS_DBG_PKT(12, pp, skb, 0, | |
1062 | "packet continues traversal as normal"); | |
1063 | return NF_ACCEPT; | |
1064 | } | |
1065 | ||
4856c84c | 1066 | return handle_response(af, skb, pp, cp, iph.len); |
1da177e4 LT |
1067 | } |
1068 | ||
1069 | ||
1070 | /* | |
1071 | * Handle ICMP messages in the outside-to-inside direction (incoming). | |
1072 | * Find any that might be relevant, check against existing connections, | |
1073 | * forward to the right destination host if relevant. | |
1074 | * Currently handles error types - unreachable, quench, ttl exceeded. | |
1075 | */ | |
e905a9ed | 1076 | static int |
3db05fea | 1077 | ip_vs_in_icmp(struct sk_buff *skb, int *related, unsigned int hooknum) |
1da177e4 | 1078 | { |
1da177e4 LT |
1079 | struct iphdr *iph; |
1080 | struct icmphdr _icmph, *ic; | |
1081 | struct iphdr _ciph, *cih; /* The ip header contained within the ICMP */ | |
51ef348b | 1082 | struct ip_vs_iphdr ciph; |
1da177e4 LT |
1083 | struct ip_vs_conn *cp; |
1084 | struct ip_vs_protocol *pp; | |
1085 | unsigned int offset, ihl, verdict; | |
f2428ed5 | 1086 | union nf_inet_addr snet; |
1da177e4 LT |
1087 | |
1088 | *related = 1; | |
1089 | ||
1090 | /* reassemble IP fragments */ | |
eddc9ec5 | 1091 | if (ip_hdr(skb)->frag_off & htons(IP_MF | IP_OFFSET)) { |
6e23ae2a | 1092 | if (ip_vs_gather_frags(skb, hooknum == NF_INET_LOCAL_IN ? |
776c729e | 1093 | IP_DEFRAG_VS_IN : IP_DEFRAG_VS_FWD)) |
1da177e4 | 1094 | return NF_STOLEN; |
1da177e4 LT |
1095 | } |
1096 | ||
eddc9ec5 | 1097 | iph = ip_hdr(skb); |
1da177e4 LT |
1098 | offset = ihl = iph->ihl * 4; |
1099 | ic = skb_header_pointer(skb, offset, sizeof(_icmph), &_icmph); | |
1100 | if (ic == NULL) | |
1101 | return NF_DROP; | |
1102 | ||
14d5e834 | 1103 | IP_VS_DBG(12, "Incoming ICMP (%d,%d) %pI4->%pI4\n", |
1da177e4 | 1104 | ic->type, ntohs(icmp_id(ic)), |
14d5e834 | 1105 | &iph->saddr, &iph->daddr); |
1da177e4 LT |
1106 | |
1107 | /* | |
1108 | * Work through seeing if this is for us. | |
1109 | * These checks are supposed to be in an order that means easy | |
1110 | * things are checked first to speed up processing.... however | |
1111 | * this means that some packets will manage to get a long way | |
1112 | * down this stack and then be rejected, but that's life. | |
1113 | */ | |
1114 | if ((ic->type != ICMP_DEST_UNREACH) && | |
1115 | (ic->type != ICMP_SOURCE_QUENCH) && | |
1116 | (ic->type != ICMP_TIME_EXCEEDED)) { | |
1117 | *related = 0; | |
1118 | return NF_ACCEPT; | |
1119 | } | |
1120 | ||
1121 | /* Now find the contained IP header */ | |
1122 | offset += sizeof(_icmph); | |
1123 | cih = skb_header_pointer(skb, offset, sizeof(_ciph), &_ciph); | |
1124 | if (cih == NULL) | |
1125 | return NF_ACCEPT; /* The packet looks wrong, ignore */ | |
1126 | ||
1127 | pp = ip_vs_proto_get(cih->protocol); | |
1128 | if (!pp) | |
1129 | return NF_ACCEPT; | |
1130 | ||
1131 | /* Is the embedded protocol header present? */ | |
4412ec49 | 1132 | if (unlikely(cih->frag_off & htons(IP_OFFSET) && |
1da177e4 LT |
1133 | pp->dont_defrag)) |
1134 | return NF_ACCEPT; | |
1135 | ||
1136 | IP_VS_DBG_PKT(11, pp, skb, offset, "Checking incoming ICMP for"); | |
1137 | ||
1138 | offset += cih->ihl * 4; | |
1139 | ||
51ef348b | 1140 | ip_vs_fill_iphdr(AF_INET, cih, &ciph); |
1da177e4 | 1141 | /* The embedded headers contain source and dest in reverse order */ |
51ef348b | 1142 | cp = pp->conn_in_get(AF_INET, skb, pp, &ciph, offset, 1); |
4856c84c MT |
1143 | if (!cp) { |
1144 | /* The packet could also belong to a local client */ | |
1145 | cp = pp->conn_out_get(AF_INET, skb, pp, &ciph, offset, 1); | |
f2428ed5 SH |
1146 | if (cp) { |
1147 | snet.ip = iph->saddr; | |
1148 | return handle_response_icmp(AF_INET, skb, &snet, | |
1149 | cih->protocol, cp, pp, | |
4856c84c | 1150 | offset, ihl); |
f2428ed5 | 1151 | } |
1da177e4 | 1152 | return NF_ACCEPT; |
4856c84c | 1153 | } |
1da177e4 LT |
1154 | |
1155 | verdict = NF_DROP; | |
1156 | ||
1157 | /* Ensure the checksum is correct */ | |
60476372 | 1158 | if (!skb_csum_unnecessary(skb) && ip_vs_checksum_complete(skb, ihl)) { |
1da177e4 | 1159 | /* Failed checksum! */ |
14d5e834 HH |
1160 | IP_VS_DBG(1, "Incoming ICMP: failed checksum from %pI4!\n", |
1161 | &iph->saddr); | |
1da177e4 LT |
1162 | goto out; |
1163 | } | |
1164 | ||
1165 | /* do the statistics and put it back */ | |
1166 | ip_vs_in_stats(cp, skb); | |
1167 | if (IPPROTO_TCP == cih->protocol || IPPROTO_UDP == cih->protocol) | |
1168 | offset += 2 * sizeof(__u16); | |
1169 | verdict = ip_vs_icmp_xmit(skb, cp, pp, offset); | |
1170 | /* do not touch skb anymore */ | |
1171 | ||
1172 | out: | |
1173 | __ip_vs_conn_put(cp); | |
1174 | ||
1175 | return verdict; | |
1176 | } | |
1177 | ||
2a3b791e JV |
1178 | #ifdef CONFIG_IP_VS_IPV6 |
1179 | static int | |
1180 | ip_vs_in_icmp_v6(struct sk_buff *skb, int *related, unsigned int hooknum) | |
1181 | { | |
1182 | struct ipv6hdr *iph; | |
1183 | struct icmp6hdr _icmph, *ic; | |
1184 | struct ipv6hdr _ciph, *cih; /* The ip header contained | |
1185 | within the ICMP */ | |
1186 | struct ip_vs_iphdr ciph; | |
1187 | struct ip_vs_conn *cp; | |
1188 | struct ip_vs_protocol *pp; | |
1189 | unsigned int offset, verdict; | |
f2428ed5 | 1190 | union nf_inet_addr snet; |
2a3b791e JV |
1191 | |
1192 | *related = 1; | |
1193 | ||
1194 | /* reassemble IP fragments */ | |
1195 | if (ipv6_hdr(skb)->nexthdr == IPPROTO_FRAGMENT) { | |
1196 | if (ip_vs_gather_frags_v6(skb, hooknum == NF_INET_LOCAL_IN ? | |
1197 | IP_DEFRAG_VS_IN : | |
1198 | IP_DEFRAG_VS_FWD)) | |
1199 | return NF_STOLEN; | |
1200 | } | |
1201 | ||
1202 | iph = ipv6_hdr(skb); | |
1203 | offset = sizeof(struct ipv6hdr); | |
1204 | ic = skb_header_pointer(skb, offset, sizeof(_icmph), &_icmph); | |
1205 | if (ic == NULL) | |
1206 | return NF_DROP; | |
1207 | ||
5b095d98 | 1208 | IP_VS_DBG(12, "Incoming ICMPv6 (%d,%d) %pI6->%pI6\n", |
2a3b791e | 1209 | ic->icmp6_type, ntohs(icmpv6_id(ic)), |
38ff4fa4 | 1210 | &iph->saddr, &iph->daddr); |
2a3b791e JV |
1211 | |
1212 | /* | |
1213 | * Work through seeing if this is for us. | |
1214 | * These checks are supposed to be in an order that means easy | |
1215 | * things are checked first to speed up processing.... however | |
1216 | * this means that some packets will manage to get a long way | |
1217 | * down this stack and then be rejected, but that's life. | |
1218 | */ | |
1219 | if ((ic->icmp6_type != ICMPV6_DEST_UNREACH) && | |
1220 | (ic->icmp6_type != ICMPV6_PKT_TOOBIG) && | |
1221 | (ic->icmp6_type != ICMPV6_TIME_EXCEED)) { | |
1222 | *related = 0; | |
1223 | return NF_ACCEPT; | |
1224 | } | |
1225 | ||
1226 | /* Now find the contained IP header */ | |
1227 | offset += sizeof(_icmph); | |
1228 | cih = skb_header_pointer(skb, offset, sizeof(_ciph), &_ciph); | |
1229 | if (cih == NULL) | |
1230 | return NF_ACCEPT; /* The packet looks wrong, ignore */ | |
1231 | ||
1232 | pp = ip_vs_proto_get(cih->nexthdr); | |
1233 | if (!pp) | |
1234 | return NF_ACCEPT; | |
1235 | ||
1236 | /* Is the embedded protocol header present? */ | |
1237 | /* TODO: we don't support fragmentation at the moment anyways */ | |
1238 | if (unlikely(cih->nexthdr == IPPROTO_FRAGMENT && pp->dont_defrag)) | |
1239 | return NF_ACCEPT; | |
1240 | ||
1241 | IP_VS_DBG_PKT(11, pp, skb, offset, "Checking incoming ICMPv6 for"); | |
1242 | ||
1243 | offset += sizeof(struct ipv6hdr); | |
1244 | ||
1245 | ip_vs_fill_iphdr(AF_INET6, cih, &ciph); | |
1246 | /* The embedded headers contain source and dest in reverse order */ | |
1247 | cp = pp->conn_in_get(AF_INET6, skb, pp, &ciph, offset, 1); | |
f2428ed5 SH |
1248 | if (!cp) { |
1249 | /* The packet could also belong to a local client */ | |
1250 | cp = pp->conn_out_get(AF_INET6, skb, pp, &ciph, offset, 1); | |
1251 | if (cp) { | |
178f5e49 | 1252 | ipv6_addr_copy(&snet.in6, &iph->saddr); |
f2428ed5 SH |
1253 | return handle_response_icmp(AF_INET6, skb, &snet, |
1254 | cih->nexthdr, | |
1255 | cp, pp, offset, | |
1256 | sizeof(struct ipv6hdr)); | |
1257 | } | |
2a3b791e | 1258 | return NF_ACCEPT; |
f2428ed5 | 1259 | } |
2a3b791e JV |
1260 | |
1261 | verdict = NF_DROP; | |
1262 | ||
1263 | /* do the statistics and put it back */ | |
1264 | ip_vs_in_stats(cp, skb); | |
2906f66a VMR |
1265 | if (IPPROTO_TCP == cih->nexthdr || IPPROTO_UDP == cih->nexthdr || |
1266 | IPPROTO_SCTP == cih->nexthdr) | |
2a3b791e JV |
1267 | offset += 2 * sizeof(__u16); |
1268 | verdict = ip_vs_icmp_xmit_v6(skb, cp, pp, offset); | |
1269 | /* do not touch skb anymore */ | |
1270 | ||
1271 | __ip_vs_conn_put(cp); | |
1272 | ||
1273 | return verdict; | |
1274 | } | |
1275 | #endif | |
1276 | ||
1277 | ||
1da177e4 LT |
1278 | /* |
1279 | * Check if it's for virtual services, look it up, | |
1280 | * and send it on its way... | |
1281 | */ | |
1282 | static unsigned int | |
3db05fea | 1283 | ip_vs_in(unsigned int hooknum, struct sk_buff *skb, |
1da177e4 LT |
1284 | const struct net_device *in, const struct net_device *out, |
1285 | int (*okfn)(struct sk_buff *)) | |
1286 | { | |
51ef348b | 1287 | struct ip_vs_iphdr iph; |
1da177e4 LT |
1288 | struct ip_vs_protocol *pp; |
1289 | struct ip_vs_conn *cp; | |
1e66dafc | 1290 | int ret, restart, af, pkts; |
2a3b791e | 1291 | |
60678040 | 1292 | af = (skb->protocol == htons(ETH_P_IP)) ? AF_INET : AF_INET6; |
51ef348b | 1293 | |
2a3b791e | 1294 | ip_vs_fill_iphdr(af, skb_network_header(skb), &iph); |
1da177e4 LT |
1295 | |
1296 | /* | |
4856c84c MT |
1297 | * Big tappo: only PACKET_HOST, including loopback for local client |
1298 | * Don't handle local packets on IPv6 for now | |
1da177e4 | 1299 | */ |
f2428ed5 | 1300 | if (unlikely(skb->pkt_type != PACKET_HOST)) { |
51ef348b JV |
1301 | IP_VS_DBG_BUF(12, "packet type=%d proto=%d daddr=%s ignored\n", |
1302 | skb->pkt_type, | |
1303 | iph.protocol, | |
2a3b791e | 1304 | IP_VS_DBG_ADDR(af, &iph.daddr)); |
1da177e4 LT |
1305 | return NF_ACCEPT; |
1306 | } | |
1307 | ||
94b26551 JV |
1308 | #ifdef CONFIG_IP_VS_IPV6 |
1309 | if (af == AF_INET6) { | |
1310 | if (unlikely(iph.protocol == IPPROTO_ICMPV6)) { | |
1311 | int related, verdict = ip_vs_in_icmp_v6(skb, &related, hooknum); | |
1da177e4 | 1312 | |
94b26551 JV |
1313 | if (related) |
1314 | return verdict; | |
1315 | ip_vs_fill_iphdr(af, skb_network_header(skb), &iph); | |
1316 | } | |
1317 | } else | |
1318 | #endif | |
1319 | if (unlikely(iph.protocol == IPPROTO_ICMP)) { | |
1320 | int related, verdict = ip_vs_in_icmp(skb, &related, hooknum); | |
1321 | ||
1322 | if (related) | |
1323 | return verdict; | |
1324 | ip_vs_fill_iphdr(af, skb_network_header(skb), &iph); | |
1325 | } | |
1da177e4 LT |
1326 | |
1327 | /* Protocol supported? */ | |
51ef348b | 1328 | pp = ip_vs_proto_get(iph.protocol); |
1da177e4 LT |
1329 | if (unlikely(!pp)) |
1330 | return NF_ACCEPT; | |
1331 | ||
1da177e4 LT |
1332 | /* |
1333 | * Check if the packet belongs to an existing connection entry | |
1334 | */ | |
2a3b791e | 1335 | cp = pp->conn_in_get(af, skb, pp, &iph, iph.len, 0); |
1da177e4 LT |
1336 | |
1337 | if (unlikely(!cp)) { | |
1338 | int v; | |
1339 | ||
4856c84c MT |
1340 | /* For local client packets, it could be a response */ |
1341 | cp = pp->conn_out_get(af, skb, pp, &iph, iph.len, 0); | |
1342 | if (cp) | |
1343 | return handle_response(af, skb, pp, cp, iph.len); | |
1344 | ||
2a3b791e | 1345 | if (!pp->conn_schedule(af, skb, pp, &v, &cp)) |
1da177e4 LT |
1346 | return v; |
1347 | } | |
1348 | ||
1349 | if (unlikely(!cp)) { | |
1350 | /* sorry, all this trouble for a no-hit :) */ | |
1351 | IP_VS_DBG_PKT(12, pp, skb, 0, | |
1352 | "packet continues traversal as normal"); | |
1353 | return NF_ACCEPT; | |
1354 | } | |
1355 | ||
1356 | IP_VS_DBG_PKT(11, pp, skb, 0, "Incoming packet"); | |
1357 | ||
1358 | /* Check the server status */ | |
1359 | if (cp->dest && !(cp->dest->flags & IP_VS_DEST_F_AVAILABLE)) { | |
1360 | /* the destination server is not available */ | |
1361 | ||
1362 | if (sysctl_ip_vs_expire_nodest_conn) { | |
1363 | /* try to expire the connection immediately */ | |
1364 | ip_vs_conn_expire_now(cp); | |
1da177e4 | 1365 | } |
dc8103f2 JA |
1366 | /* don't restart its timer, and silently |
1367 | drop the packet. */ | |
1368 | __ip_vs_conn_put(cp); | |
1da177e4 LT |
1369 | return NF_DROP; |
1370 | } | |
1371 | ||
1372 | ip_vs_in_stats(cp, skb); | |
1373 | restart = ip_vs_set_state(cp, IP_VS_DIR_INPUT, skb, pp); | |
1374 | if (cp->packet_xmit) | |
1375 | ret = cp->packet_xmit(skb, cp, pp); | |
1376 | /* do not touch skb anymore */ | |
1377 | else { | |
1378 | IP_VS_DBG_RL("warning: packet_xmit is null"); | |
1379 | ret = NF_ACCEPT; | |
1380 | } | |
1381 | ||
efac5276 RB |
1382 | /* Increase its packet counter and check if it is needed |
1383 | * to be synchronized | |
1384 | * | |
1385 | * Sync connection if it is about to close to | |
1386 | * encorage the standby servers to update the connections timeout | |
1387 | */ | |
1e66dafc | 1388 | pkts = atomic_add_return(1, &cp->in_pkts); |
2906f66a VMR |
1389 | if (af == AF_INET && (ip_vs_sync_state & IP_VS_STATE_MASTER) && |
1390 | cp->protocol == IPPROTO_SCTP) { | |
1391 | if ((cp->state == IP_VS_SCTP_S_ESTABLISHED && | |
1392 | (atomic_read(&cp->in_pkts) % | |
1393 | sysctl_ip_vs_sync_threshold[1] | |
1394 | == sysctl_ip_vs_sync_threshold[0])) || | |
1395 | (cp->old_state != cp->state && | |
1396 | ((cp->state == IP_VS_SCTP_S_CLOSED) || | |
1397 | (cp->state == IP_VS_SCTP_S_SHUT_ACK_CLI) || | |
1398 | (cp->state == IP_VS_SCTP_S_SHUT_ACK_SER)))) { | |
1399 | ip_vs_sync_conn(cp); | |
1400 | goto out; | |
1401 | } | |
1402 | } | |
1403 | ||
c6883f58 JV |
1404 | if (af == AF_INET && |
1405 | (ip_vs_sync_state & IP_VS_STATE_MASTER) && | |
efac5276 RB |
1406 | (((cp->protocol != IPPROTO_TCP || |
1407 | cp->state == IP_VS_TCP_S_ESTABLISHED) && | |
1e66dafc | 1408 | (pkts % sysctl_ip_vs_sync_threshold[1] |
efac5276 RB |
1409 | == sysctl_ip_vs_sync_threshold[0])) || |
1410 | ((cp->protocol == IPPROTO_TCP) && (cp->old_state != cp->state) && | |
1411 | ((cp->state == IP_VS_TCP_S_FIN_WAIT) || | |
9abfe315 | 1412 | (cp->state == IP_VS_TCP_S_CLOSE) || |
9d3a0de7 RB |
1413 | (cp->state == IP_VS_TCP_S_CLOSE_WAIT) || |
1414 | (cp->state == IP_VS_TCP_S_TIME_WAIT))))) | |
1da177e4 | 1415 | ip_vs_sync_conn(cp); |
2906f66a | 1416 | out: |
efac5276 | 1417 | cp->old_state = cp->state; |
1da177e4 LT |
1418 | |
1419 | ip_vs_conn_put(cp); | |
1420 | return ret; | |
1421 | } | |
1422 | ||
1423 | ||
1424 | /* | |
6e23ae2a | 1425 | * It is hooked at the NF_INET_FORWARD chain, in order to catch ICMP |
1da177e4 LT |
1426 | * related packets destined for 0.0.0.0/0. |
1427 | * When fwmark-based virtual service is used, such as transparent | |
1428 | * cache cluster, TCP packets can be marked and routed to ip_vs_in, | |
1429 | * but ICMP destined for 0.0.0.0/0 cannot not be easily marked and | |
6e23ae2a | 1430 | * sent to ip_vs_in_icmp. So, catch them at the NF_INET_FORWARD chain |
1da177e4 LT |
1431 | * and send them to ip_vs_in_icmp. |
1432 | */ | |
1433 | static unsigned int | |
3db05fea | 1434 | ip_vs_forward_icmp(unsigned int hooknum, struct sk_buff *skb, |
1da177e4 LT |
1435 | const struct net_device *in, const struct net_device *out, |
1436 | int (*okfn)(struct sk_buff *)) | |
1437 | { | |
1438 | int r; | |
1439 | ||
3db05fea | 1440 | if (ip_hdr(skb)->protocol != IPPROTO_ICMP) |
1da177e4 LT |
1441 | return NF_ACCEPT; |
1442 | ||
3db05fea | 1443 | return ip_vs_in_icmp(skb, &r, hooknum); |
1da177e4 LT |
1444 | } |
1445 | ||
2a3b791e JV |
1446 | #ifdef CONFIG_IP_VS_IPV6 |
1447 | static unsigned int | |
1448 | ip_vs_forward_icmp_v6(unsigned int hooknum, struct sk_buff *skb, | |
1449 | const struct net_device *in, const struct net_device *out, | |
1450 | int (*okfn)(struct sk_buff *)) | |
1451 | { | |
1452 | int r; | |
1453 | ||
1454 | if (ipv6_hdr(skb)->nexthdr != IPPROTO_ICMPV6) | |
1455 | return NF_ACCEPT; | |
1456 | ||
1457 | return ip_vs_in_icmp_v6(skb, &r, hooknum); | |
1458 | } | |
1459 | #endif | |
1460 | ||
1da177e4 | 1461 | |
1999414a | 1462 | static struct nf_hook_ops ip_vs_ops[] __read_mostly = { |
41c5b317 PM |
1463 | /* After packet filtering, forward packet through VS/DR, VS/TUN, |
1464 | * or VS/NAT(change destination), so that filtering rules can be | |
1465 | * applied to IPVS. */ | |
1466 | { | |
1467 | .hook = ip_vs_in, | |
1468 | .owner = THIS_MODULE, | |
1469 | .pf = PF_INET, | |
1470 | .hooknum = NF_INET_LOCAL_IN, | |
1471 | .priority = 100, | |
1472 | }, | |
1473 | /* After packet filtering, change source only for VS/NAT */ | |
1474 | { | |
1475 | .hook = ip_vs_out, | |
1476 | .owner = THIS_MODULE, | |
1477 | .pf = PF_INET, | |
1478 | .hooknum = NF_INET_FORWARD, | |
1479 | .priority = 100, | |
1480 | }, | |
1481 | /* After packet filtering (but before ip_vs_out_icmp), catch icmp | |
1482 | * destined for 0.0.0.0/0, which is for incoming IPVS connections */ | |
1483 | { | |
1484 | .hook = ip_vs_forward_icmp, | |
1485 | .owner = THIS_MODULE, | |
1486 | .pf = PF_INET, | |
1487 | .hooknum = NF_INET_FORWARD, | |
1488 | .priority = 99, | |
1489 | }, | |
1490 | /* Before the netfilter connection tracking, exit from POST_ROUTING */ | |
1491 | { | |
1492 | .hook = ip_vs_post_routing, | |
1493 | .owner = THIS_MODULE, | |
1494 | .pf = PF_INET, | |
1495 | .hooknum = NF_INET_POST_ROUTING, | |
1496 | .priority = NF_IP_PRI_NAT_SRC-1, | |
1497 | }, | |
473b23d3 JV |
1498 | #ifdef CONFIG_IP_VS_IPV6 |
1499 | /* After packet filtering, forward packet through VS/DR, VS/TUN, | |
1500 | * or VS/NAT(change destination), so that filtering rules can be | |
1501 | * applied to IPVS. */ | |
1502 | { | |
1503 | .hook = ip_vs_in, | |
1504 | .owner = THIS_MODULE, | |
1505 | .pf = PF_INET6, | |
1506 | .hooknum = NF_INET_LOCAL_IN, | |
1507 | .priority = 100, | |
1508 | }, | |
1509 | /* After packet filtering, change source only for VS/NAT */ | |
1510 | { | |
1511 | .hook = ip_vs_out, | |
1512 | .owner = THIS_MODULE, | |
1513 | .pf = PF_INET6, | |
1514 | .hooknum = NF_INET_FORWARD, | |
1515 | .priority = 100, | |
1516 | }, | |
1517 | /* After packet filtering (but before ip_vs_out_icmp), catch icmp | |
1518 | * destined for 0.0.0.0/0, which is for incoming IPVS connections */ | |
1519 | { | |
1520 | .hook = ip_vs_forward_icmp_v6, | |
1521 | .owner = THIS_MODULE, | |
1522 | .pf = PF_INET6, | |
1523 | .hooknum = NF_INET_FORWARD, | |
1524 | .priority = 99, | |
1525 | }, | |
1526 | /* Before the netfilter connection tracking, exit from POST_ROUTING */ | |
1527 | { | |
1528 | .hook = ip_vs_post_routing, | |
1529 | .owner = THIS_MODULE, | |
1530 | .pf = PF_INET6, | |
1531 | .hooknum = NF_INET_POST_ROUTING, | |
1532 | .priority = NF_IP6_PRI_NAT_SRC-1, | |
1533 | }, | |
1534 | #endif | |
1da177e4 LT |
1535 | }; |
1536 | ||
1537 | ||
1538 | /* | |
1539 | * Initialize IP Virtual Server | |
1540 | */ | |
1541 | static int __init ip_vs_init(void) | |
1542 | { | |
1543 | int ret; | |
1544 | ||
a919cf4b SW |
1545 | ip_vs_estimator_init(); |
1546 | ||
1da177e4 LT |
1547 | ret = ip_vs_control_init(); |
1548 | if (ret < 0) { | |
1e3e238e | 1549 | pr_err("can't setup control.\n"); |
a919cf4b | 1550 | goto cleanup_estimator; |
1da177e4 LT |
1551 | } |
1552 | ||
1553 | ip_vs_protocol_init(); | |
1554 | ||
1555 | ret = ip_vs_app_init(); | |
1556 | if (ret < 0) { | |
1e3e238e | 1557 | pr_err("can't setup application helper.\n"); |
1da177e4 LT |
1558 | goto cleanup_protocol; |
1559 | } | |
1560 | ||
1561 | ret = ip_vs_conn_init(); | |
1562 | if (ret < 0) { | |
1e3e238e | 1563 | pr_err("can't setup connection table.\n"); |
1da177e4 LT |
1564 | goto cleanup_app; |
1565 | } | |
1566 | ||
41c5b317 | 1567 | ret = nf_register_hooks(ip_vs_ops, ARRAY_SIZE(ip_vs_ops)); |
1da177e4 | 1568 | if (ret < 0) { |
1e3e238e | 1569 | pr_err("can't register hooks.\n"); |
1da177e4 LT |
1570 | goto cleanup_conn; |
1571 | } | |
1572 | ||
1e3e238e | 1573 | pr_info("ipvs loaded.\n"); |
1da177e4 LT |
1574 | return ret; |
1575 | ||
1da177e4 LT |
1576 | cleanup_conn: |
1577 | ip_vs_conn_cleanup(); | |
1578 | cleanup_app: | |
1579 | ip_vs_app_cleanup(); | |
1580 | cleanup_protocol: | |
1581 | ip_vs_protocol_cleanup(); | |
1582 | ip_vs_control_cleanup(); | |
a919cf4b SW |
1583 | cleanup_estimator: |
1584 | ip_vs_estimator_cleanup(); | |
1da177e4 LT |
1585 | return ret; |
1586 | } | |
1587 | ||
1588 | static void __exit ip_vs_cleanup(void) | |
1589 | { | |
41c5b317 | 1590 | nf_unregister_hooks(ip_vs_ops, ARRAY_SIZE(ip_vs_ops)); |
1da177e4 LT |
1591 | ip_vs_conn_cleanup(); |
1592 | ip_vs_app_cleanup(); | |
1593 | ip_vs_protocol_cleanup(); | |
1594 | ip_vs_control_cleanup(); | |
a919cf4b | 1595 | ip_vs_estimator_cleanup(); |
1e3e238e | 1596 | pr_info("ipvs unloaded.\n"); |
1da177e4 LT |
1597 | } |
1598 | ||
1599 | module_init(ip_vs_init); | |
1600 | module_exit(ip_vs_cleanup); | |
1601 | MODULE_LICENSE("GPL"); |