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Commit | Line | Data |
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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 | * | |
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); | |
1da177e4 LT |
57 | EXPORT_SYMBOL(ip_vs_proto_name); |
58 | EXPORT_SYMBOL(ip_vs_conn_new); | |
59 | EXPORT_SYMBOL(ip_vs_conn_in_get); | |
60 | EXPORT_SYMBOL(ip_vs_conn_out_get); | |
61 | #ifdef CONFIG_IP_VS_PROTO_TCP | |
62 | EXPORT_SYMBOL(ip_vs_tcp_conn_listen); | |
63 | #endif | |
64 | EXPORT_SYMBOL(ip_vs_conn_put); | |
65 | #ifdef CONFIG_IP_VS_DEBUG | |
66 | EXPORT_SYMBOL(ip_vs_get_debug_level); | |
67 | #endif | |
1da177e4 LT |
68 | |
69 | ||
70 | /* ID used in ICMP lookups */ | |
71 | #define icmp_id(icmph) (((icmph)->un).echo.id) | |
2a3b791e | 72 | #define icmpv6_id(icmph) (icmph->icmp6_dataun.u_echo.identifier) |
1da177e4 LT |
73 | |
74 | const char *ip_vs_proto_name(unsigned proto) | |
75 | { | |
76 | static char buf[20]; | |
77 | ||
78 | switch (proto) { | |
79 | case IPPROTO_IP: | |
80 | return "IP"; | |
81 | case IPPROTO_UDP: | |
82 | return "UDP"; | |
83 | case IPPROTO_TCP: | |
84 | return "TCP"; | |
2906f66a VMR |
85 | case IPPROTO_SCTP: |
86 | return "SCTP"; | |
1da177e4 LT |
87 | case IPPROTO_ICMP: |
88 | return "ICMP"; | |
2a3b791e JV |
89 | #ifdef CONFIG_IP_VS_IPV6 |
90 | case IPPROTO_ICMPV6: | |
91 | return "ICMPv6"; | |
92 | #endif | |
1da177e4 LT |
93 | default: |
94 | sprintf(buf, "IP_%d", proto); | |
95 | return buf; | |
96 | } | |
97 | } | |
98 | ||
99 | void ip_vs_init_hash_table(struct list_head *table, int rows) | |
100 | { | |
101 | while (--rows >= 0) | |
102 | INIT_LIST_HEAD(&table[rows]); | |
103 | } | |
104 | ||
105 | static inline void | |
106 | ip_vs_in_stats(struct ip_vs_conn *cp, struct sk_buff *skb) | |
107 | { | |
108 | struct ip_vs_dest *dest = cp->dest; | |
109 | if (dest && (dest->flags & IP_VS_DEST_F_AVAILABLE)) { | |
110 | spin_lock(&dest->stats.lock); | |
e9c0ce23 SW |
111 | dest->stats.ustats.inpkts++; |
112 | dest->stats.ustats.inbytes += skb->len; | |
1da177e4 LT |
113 | spin_unlock(&dest->stats.lock); |
114 | ||
115 | spin_lock(&dest->svc->stats.lock); | |
e9c0ce23 SW |
116 | dest->svc->stats.ustats.inpkts++; |
117 | dest->svc->stats.ustats.inbytes += skb->len; | |
1da177e4 LT |
118 | spin_unlock(&dest->svc->stats.lock); |
119 | ||
120 | spin_lock(&ip_vs_stats.lock); | |
e9c0ce23 SW |
121 | ip_vs_stats.ustats.inpkts++; |
122 | ip_vs_stats.ustats.inbytes += skb->len; | |
1da177e4 LT |
123 | spin_unlock(&ip_vs_stats.lock); |
124 | } | |
125 | } | |
126 | ||
127 | ||
128 | static inline void | |
129 | ip_vs_out_stats(struct ip_vs_conn *cp, struct sk_buff *skb) | |
130 | { | |
131 | struct ip_vs_dest *dest = cp->dest; | |
132 | if (dest && (dest->flags & IP_VS_DEST_F_AVAILABLE)) { | |
133 | spin_lock(&dest->stats.lock); | |
e9c0ce23 SW |
134 | dest->stats.ustats.outpkts++; |
135 | dest->stats.ustats.outbytes += skb->len; | |
1da177e4 LT |
136 | spin_unlock(&dest->stats.lock); |
137 | ||
138 | spin_lock(&dest->svc->stats.lock); | |
e9c0ce23 SW |
139 | dest->svc->stats.ustats.outpkts++; |
140 | dest->svc->stats.ustats.outbytes += skb->len; | |
1da177e4 LT |
141 | spin_unlock(&dest->svc->stats.lock); |
142 | ||
143 | spin_lock(&ip_vs_stats.lock); | |
e9c0ce23 SW |
144 | ip_vs_stats.ustats.outpkts++; |
145 | ip_vs_stats.ustats.outbytes += skb->len; | |
1da177e4 LT |
146 | spin_unlock(&ip_vs_stats.lock); |
147 | } | |
148 | } | |
149 | ||
150 | ||
151 | static inline void | |
152 | ip_vs_conn_stats(struct ip_vs_conn *cp, struct ip_vs_service *svc) | |
153 | { | |
154 | spin_lock(&cp->dest->stats.lock); | |
e9c0ce23 | 155 | cp->dest->stats.ustats.conns++; |
1da177e4 LT |
156 | spin_unlock(&cp->dest->stats.lock); |
157 | ||
158 | spin_lock(&svc->stats.lock); | |
e9c0ce23 | 159 | svc->stats.ustats.conns++; |
1da177e4 LT |
160 | spin_unlock(&svc->stats.lock); |
161 | ||
162 | spin_lock(&ip_vs_stats.lock); | |
e9c0ce23 | 163 | ip_vs_stats.ustats.conns++; |
1da177e4 LT |
164 | spin_unlock(&ip_vs_stats.lock); |
165 | } | |
166 | ||
167 | ||
168 | static inline int | |
169 | ip_vs_set_state(struct ip_vs_conn *cp, int direction, | |
170 | const struct sk_buff *skb, | |
171 | struct ip_vs_protocol *pp) | |
172 | { | |
173 | if (unlikely(!pp->state_transition)) | |
174 | return 0; | |
175 | return pp->state_transition(cp, direction, skb, pp); | |
176 | } | |
177 | ||
178 | ||
1da177e4 LT |
179 | /* |
180 | * IPVS persistent scheduling function | |
181 | * It creates a connection entry according to its template if exists, | |
182 | * or selects a server and creates a connection entry plus a template. | |
183 | * Locking: we are svc user (svc->refcnt), so we hold all dests too | |
184 | * Protocols supported: TCP, UDP | |
185 | */ | |
186 | static struct ip_vs_conn * | |
187 | ip_vs_sched_persist(struct ip_vs_service *svc, | |
188 | const struct sk_buff *skb, | |
014d730d | 189 | __be16 ports[2]) |
1da177e4 LT |
190 | { |
191 | struct ip_vs_conn *cp = NULL; | |
28364a59 | 192 | struct ip_vs_iphdr iph; |
1da177e4 LT |
193 | struct ip_vs_dest *dest; |
194 | struct ip_vs_conn *ct; | |
cd17f9ed | 195 | __be16 dport; /* destination port to forward */ |
26ec037f | 196 | __be16 flags; |
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 | ||
26ec037f NC |
343 | flags = (svc->flags & IP_VS_SVC_F_ONEPACKET |
344 | && iph.protocol == IPPROTO_UDP)? | |
345 | IP_VS_CONN_F_ONE_PACKET : 0; | |
346 | ||
1da177e4 LT |
347 | /* |
348 | * Create a new connection according to the template | |
349 | */ | |
cd17f9ed | 350 | cp = ip_vs_conn_new(svc->af, iph.protocol, |
28364a59 JV |
351 | &iph.saddr, ports[0], |
352 | &iph.daddr, ports[1], | |
353 | &dest->addr, dport, | |
26ec037f | 354 | flags, |
1da177e4 LT |
355 | dest); |
356 | if (cp == NULL) { | |
357 | ip_vs_conn_put(ct); | |
358 | return NULL; | |
359 | } | |
360 | ||
361 | /* | |
362 | * Add its control | |
363 | */ | |
364 | ip_vs_control_add(cp, ct); | |
365 | ip_vs_conn_put(ct); | |
366 | ||
367 | ip_vs_conn_stats(cp, svc); | |
368 | return cp; | |
369 | } | |
370 | ||
371 | ||
372 | /* | |
373 | * IPVS main scheduling function | |
374 | * It selects a server according to the virtual service, and | |
375 | * creates a connection entry. | |
376 | * Protocols supported: TCP, UDP | |
377 | */ | |
378 | struct ip_vs_conn * | |
379 | ip_vs_schedule(struct ip_vs_service *svc, const struct sk_buff *skb) | |
380 | { | |
381 | struct ip_vs_conn *cp = NULL; | |
28364a59 | 382 | struct ip_vs_iphdr iph; |
1da177e4 | 383 | struct ip_vs_dest *dest; |
26ec037f | 384 | __be16 _ports[2], *pptr, flags; |
1da177e4 | 385 | |
28364a59 JV |
386 | ip_vs_fill_iphdr(svc->af, skb_network_header(skb), &iph); |
387 | pptr = skb_header_pointer(skb, iph.len, sizeof(_ports), _ports); | |
1da177e4 LT |
388 | if (pptr == NULL) |
389 | return NULL; | |
390 | ||
391 | /* | |
392 | * Persistent service | |
393 | */ | |
394 | if (svc->flags & IP_VS_SVC_F_PERSISTENT) | |
395 | return ip_vs_sched_persist(svc, skb, pptr); | |
396 | ||
397 | /* | |
398 | * Non-persistent service | |
399 | */ | |
400 | if (!svc->fwmark && pptr[1] != svc->port) { | |
401 | if (!svc->port) | |
1e3e238e HE |
402 | pr_err("Schedule: port zero only supported " |
403 | "in persistent services, " | |
404 | "check your ipvs configuration\n"); | |
1da177e4 LT |
405 | return NULL; |
406 | } | |
407 | ||
408 | dest = svc->scheduler->schedule(svc, skb); | |
409 | if (dest == NULL) { | |
410 | IP_VS_DBG(1, "Schedule: no dest found.\n"); | |
411 | return NULL; | |
412 | } | |
413 | ||
26ec037f NC |
414 | flags = (svc->flags & IP_VS_SVC_F_ONEPACKET |
415 | && iph.protocol == IPPROTO_UDP)? | |
416 | IP_VS_CONN_F_ONE_PACKET : 0; | |
417 | ||
1da177e4 LT |
418 | /* |
419 | * Create a connection entry. | |
420 | */ | |
cd17f9ed | 421 | cp = ip_vs_conn_new(svc->af, iph.protocol, |
28364a59 JV |
422 | &iph.saddr, pptr[0], |
423 | &iph.daddr, pptr[1], | |
424 | &dest->addr, dest->port ? dest->port : pptr[1], | |
26ec037f | 425 | flags, |
1da177e4 LT |
426 | dest); |
427 | if (cp == NULL) | |
428 | return NULL; | |
429 | ||
cd17f9ed JV |
430 | IP_VS_DBG_BUF(6, "Schedule fwd:%c c:%s:%u v:%s:%u " |
431 | "d:%s:%u conn->flags:%X conn->refcnt:%d\n", | |
432 | ip_vs_fwd_tag(cp), | |
433 | IP_VS_DBG_ADDR(svc->af, &cp->caddr), ntohs(cp->cport), | |
434 | IP_VS_DBG_ADDR(svc->af, &cp->vaddr), ntohs(cp->vport), | |
435 | IP_VS_DBG_ADDR(svc->af, &cp->daddr), ntohs(cp->dport), | |
436 | cp->flags, atomic_read(&cp->refcnt)); | |
1da177e4 LT |
437 | |
438 | ip_vs_conn_stats(cp, svc); | |
439 | return cp; | |
440 | } | |
441 | ||
442 | ||
443 | /* | |
444 | * Pass or drop the packet. | |
445 | * Called by ip_vs_in, when the virtual service is available but | |
446 | * no destination is available for a new connection. | |
447 | */ | |
448 | int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb, | |
449 | struct ip_vs_protocol *pp) | |
450 | { | |
014d730d | 451 | __be16 _ports[2], *pptr; |
28364a59 | 452 | struct ip_vs_iphdr iph; |
2a3b791e JV |
453 | int unicast; |
454 | ip_vs_fill_iphdr(svc->af, skb_network_header(skb), &iph); | |
1da177e4 | 455 | |
28364a59 | 456 | pptr = skb_header_pointer(skb, iph.len, sizeof(_ports), _ports); |
1da177e4 LT |
457 | if (pptr == NULL) { |
458 | ip_vs_service_put(svc); | |
459 | return NF_DROP; | |
460 | } | |
461 | ||
2a3b791e JV |
462 | #ifdef CONFIG_IP_VS_IPV6 |
463 | if (svc->af == AF_INET6) | |
464 | unicast = ipv6_addr_type(&iph.daddr.in6) & IPV6_ADDR_UNICAST; | |
465 | else | |
466 | #endif | |
467 | unicast = (inet_addr_type(&init_net, iph.daddr.ip) == RTN_UNICAST); | |
468 | ||
1da177e4 | 469 | /* if it is fwmark-based service, the cache_bypass sysctl is up |
2a3b791e | 470 | and the destination is a non-local unicast, then create |
1da177e4 | 471 | a cache_bypass connection entry */ |
2a3b791e | 472 | if (sysctl_ip_vs_cache_bypass && svc->fwmark && unicast) { |
1da177e4 LT |
473 | int ret, cs; |
474 | struct ip_vs_conn *cp; | |
26ec037f NC |
475 | __u16 flags = (svc->flags & IP_VS_SVC_F_ONEPACKET && |
476 | iph.protocol == IPPROTO_UDP)? | |
477 | IP_VS_CONN_F_ONE_PACKET : 0; | |
dff630dd | 478 | union nf_inet_addr daddr = { .all = { 0, 0, 0, 0 } }; |
1da177e4 LT |
479 | |
480 | ip_vs_service_put(svc); | |
481 | ||
482 | /* create a new connection entry */ | |
1e3e238e | 483 | IP_VS_DBG(6, "%s(): create a cache_bypass entry\n", __func__); |
2a3b791e | 484 | cp = ip_vs_conn_new(svc->af, iph.protocol, |
28364a59 JV |
485 | &iph.saddr, pptr[0], |
486 | &iph.daddr, pptr[1], | |
dff630dd | 487 | &daddr, 0, |
26ec037f | 488 | IP_VS_CONN_F_BYPASS | flags, |
1da177e4 LT |
489 | NULL); |
490 | if (cp == NULL) | |
491 | return NF_DROP; | |
492 | ||
493 | /* statistics */ | |
494 | ip_vs_in_stats(cp, skb); | |
495 | ||
496 | /* set state */ | |
497 | cs = ip_vs_set_state(cp, IP_VS_DIR_INPUT, skb, pp); | |
498 | ||
499 | /* transmit the first SYN packet */ | |
500 | ret = cp->packet_xmit(skb, cp, pp); | |
501 | /* do not touch skb anymore */ | |
502 | ||
503 | atomic_inc(&cp->in_pkts); | |
504 | ip_vs_conn_put(cp); | |
505 | return ret; | |
506 | } | |
507 | ||
508 | /* | |
509 | * When the virtual ftp service is presented, packets destined | |
510 | * for other services on the VIP may get here (except services | |
511 | * listed in the ipvs table), pass the packets, because it is | |
512 | * not ipvs job to decide to drop the packets. | |
513 | */ | |
514 | if ((svc->port == FTPPORT) && (pptr[1] != FTPPORT)) { | |
515 | ip_vs_service_put(svc); | |
516 | return NF_ACCEPT; | |
517 | } | |
518 | ||
519 | ip_vs_service_put(svc); | |
520 | ||
521 | /* | |
522 | * Notify the client that the destination is unreachable, and | |
523 | * release the socket buffer. | |
524 | * Since it is in IP layer, the TCP socket is not actually | |
525 | * created, the TCP RST packet cannot be sent, instead that | |
526 | * ICMP_PORT_UNREACH is sent here no matter it is TCP/UDP. --WZ | |
527 | */ | |
2a3b791e JV |
528 | #ifdef CONFIG_IP_VS_IPV6 |
529 | if (svc->af == AF_INET6) | |
3ffe533c | 530 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); |
2a3b791e JV |
531 | else |
532 | #endif | |
533 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); | |
534 | ||
1da177e4 LT |
535 | return NF_DROP; |
536 | } | |
537 | ||
b1550f22 | 538 | __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset) |
1da177e4 | 539 | { |
d3bc23e7 | 540 | return csum_fold(skb_checksum(skb, offset, skb->len - offset, 0)); |
1da177e4 LT |
541 | } |
542 | ||
776c729e | 543 | static inline int ip_vs_gather_frags(struct sk_buff *skb, u_int32_t user) |
1da177e4 | 544 | { |
776c729e HX |
545 | int err = ip_defrag(skb, user); |
546 | ||
547 | if (!err) | |
eddc9ec5 | 548 | ip_send_check(ip_hdr(skb)); |
776c729e HX |
549 | |
550 | return err; | |
1da177e4 LT |
551 | } |
552 | ||
2a3b791e JV |
553 | #ifdef CONFIG_IP_VS_IPV6 |
554 | static inline int ip_vs_gather_frags_v6(struct sk_buff *skb, u_int32_t user) | |
555 | { | |
556 | /* TODO IPv6: Find out what to do here for IPv6 */ | |
557 | return 0; | |
558 | } | |
559 | #endif | |
560 | ||
1da177e4 LT |
561 | /* |
562 | * Packet has been made sufficiently writable in caller | |
563 | * - inout: 1=in->out, 0=out->in | |
564 | */ | |
565 | void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp, | |
566 | struct ip_vs_conn *cp, int inout) | |
567 | { | |
eddc9ec5 | 568 | struct iphdr *iph = ip_hdr(skb); |
1da177e4 | 569 | unsigned int icmp_offset = iph->ihl*4; |
d56f90a7 ACM |
570 | struct icmphdr *icmph = (struct icmphdr *)(skb_network_header(skb) + |
571 | icmp_offset); | |
1da177e4 LT |
572 | struct iphdr *ciph = (struct iphdr *)(icmph + 1); |
573 | ||
574 | if (inout) { | |
e7ade46a | 575 | iph->saddr = cp->vaddr.ip; |
1da177e4 | 576 | ip_send_check(iph); |
e7ade46a | 577 | ciph->daddr = cp->vaddr.ip; |
1da177e4 LT |
578 | ip_send_check(ciph); |
579 | } else { | |
e7ade46a | 580 | iph->daddr = cp->daddr.ip; |
1da177e4 | 581 | ip_send_check(iph); |
e7ade46a | 582 | ciph->saddr = cp->daddr.ip; |
1da177e4 LT |
583 | ip_send_check(ciph); |
584 | } | |
585 | ||
2906f66a VMR |
586 | /* the TCP/UDP/SCTP port */ |
587 | if (IPPROTO_TCP == ciph->protocol || IPPROTO_UDP == ciph->protocol || | |
588 | IPPROTO_SCTP == ciph->protocol) { | |
014d730d | 589 | __be16 *ports = (void *)ciph + ciph->ihl*4; |
1da177e4 LT |
590 | |
591 | if (inout) | |
592 | ports[1] = cp->vport; | |
593 | else | |
594 | ports[0] = cp->dport; | |
595 | } | |
596 | ||
597 | /* And finally the ICMP checksum */ | |
598 | icmph->checksum = 0; | |
599 | icmph->checksum = ip_vs_checksum_complete(skb, icmp_offset); | |
600 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
601 | ||
602 | if (inout) | |
603 | IP_VS_DBG_PKT(11, pp, skb, (void *)ciph - (void *)iph, | |
604 | "Forwarding altered outgoing ICMP"); | |
605 | else | |
606 | IP_VS_DBG_PKT(11, pp, skb, (void *)ciph - (void *)iph, | |
607 | "Forwarding altered incoming ICMP"); | |
608 | } | |
609 | ||
b3cdd2a7 JV |
610 | #ifdef CONFIG_IP_VS_IPV6 |
611 | void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp, | |
612 | struct ip_vs_conn *cp, int inout) | |
613 | { | |
614 | struct ipv6hdr *iph = ipv6_hdr(skb); | |
615 | unsigned int icmp_offset = sizeof(struct ipv6hdr); | |
616 | struct icmp6hdr *icmph = (struct icmp6hdr *)(skb_network_header(skb) + | |
617 | icmp_offset); | |
618 | struct ipv6hdr *ciph = (struct ipv6hdr *)(icmph + 1); | |
619 | ||
620 | if (inout) { | |
621 | iph->saddr = cp->vaddr.in6; | |
622 | ciph->daddr = cp->vaddr.in6; | |
623 | } else { | |
624 | iph->daddr = cp->daddr.in6; | |
625 | ciph->saddr = cp->daddr.in6; | |
626 | } | |
627 | ||
2906f66a VMR |
628 | /* the TCP/UDP/SCTP port */ |
629 | if (IPPROTO_TCP == ciph->nexthdr || IPPROTO_UDP == ciph->nexthdr || | |
630 | IPPROTO_SCTP == ciph->nexthdr) { | |
b3cdd2a7 JV |
631 | __be16 *ports = (void *)ciph + sizeof(struct ipv6hdr); |
632 | ||
633 | if (inout) | |
634 | ports[1] = cp->vport; | |
635 | else | |
636 | ports[0] = cp->dport; | |
637 | } | |
638 | ||
639 | /* And finally the ICMP checksum */ | |
640 | icmph->icmp6_cksum = 0; | |
641 | /* TODO IPv6: is this correct for ICMPv6? */ | |
642 | ip_vs_checksum_complete(skb, icmp_offset); | |
643 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
644 | ||
645 | if (inout) | |
646 | IP_VS_DBG_PKT(11, pp, skb, (void *)ciph - (void *)iph, | |
647 | "Forwarding altered outgoing ICMPv6"); | |
648 | else | |
649 | IP_VS_DBG_PKT(11, pp, skb, (void *)ciph - (void *)iph, | |
650 | "Forwarding altered incoming ICMPv6"); | |
651 | } | |
652 | #endif | |
653 | ||
4856c84c MT |
654 | /* Handle relevant response ICMP messages - forward to the right |
655 | * destination host. Used for NAT and local client. | |
656 | */ | |
f2428ed5 SH |
657 | static int handle_response_icmp(int af, struct sk_buff *skb, |
658 | union nf_inet_addr *snet, | |
659 | __u8 protocol, struct ip_vs_conn *cp, | |
4856c84c MT |
660 | struct ip_vs_protocol *pp, |
661 | unsigned int offset, unsigned int ihl) | |
662 | { | |
663 | unsigned int verdict = NF_DROP; | |
664 | ||
665 | if (IP_VS_FWD_METHOD(cp) != 0) { | |
1e3e238e HE |
666 | pr_err("shouldn't reach here, because the box is on the " |
667 | "half connection in the tun/dr module.\n"); | |
4856c84c MT |
668 | } |
669 | ||
670 | /* Ensure the checksum is correct */ | |
671 | if (!skb_csum_unnecessary(skb) && ip_vs_checksum_complete(skb, ihl)) { | |
672 | /* Failed checksum! */ | |
f2428ed5 SH |
673 | IP_VS_DBG_BUF(1, "Forward ICMP: failed checksum from %s!\n", |
674 | IP_VS_DBG_ADDR(af, snet)); | |
4856c84c MT |
675 | goto out; |
676 | } | |
677 | ||
2906f66a VMR |
678 | if (IPPROTO_TCP == protocol || IPPROTO_UDP == protocol || |
679 | IPPROTO_SCTP == protocol) | |
4856c84c MT |
680 | offset += 2 * sizeof(__u16); |
681 | if (!skb_make_writable(skb, offset)) | |
682 | goto out; | |
683 | ||
f2428ed5 SH |
684 | #ifdef CONFIG_IP_VS_IPV6 |
685 | if (af == AF_INET6) | |
686 | ip_vs_nat_icmp_v6(skb, pp, cp, 1); | |
687 | else | |
688 | #endif | |
689 | ip_vs_nat_icmp(skb, pp, cp, 1); | |
4856c84c MT |
690 | |
691 | /* do the statistics and put it back */ | |
692 | ip_vs_out_stats(cp, skb); | |
693 | ||
694 | skb->ipvs_property = 1; | |
695 | verdict = NF_ACCEPT; | |
696 | ||
697 | out: | |
698 | __ip_vs_conn_put(cp); | |
699 | ||
700 | return verdict; | |
701 | } | |
702 | ||
1da177e4 LT |
703 | /* |
704 | * Handle ICMP messages in the inside-to-outside direction (outgoing). | |
4856c84c | 705 | * Find any that might be relevant, check against existing connections. |
1da177e4 | 706 | * Currently handles error types - unreachable, quench, ttl exceeded. |
1da177e4 | 707 | */ |
3db05fea | 708 | static int ip_vs_out_icmp(struct sk_buff *skb, int *related) |
1da177e4 | 709 | { |
1da177e4 LT |
710 | struct iphdr *iph; |
711 | struct icmphdr _icmph, *ic; | |
712 | struct iphdr _ciph, *cih; /* The ip header contained within the ICMP */ | |
51ef348b | 713 | struct ip_vs_iphdr ciph; |
1da177e4 LT |
714 | struct ip_vs_conn *cp; |
715 | struct ip_vs_protocol *pp; | |
4856c84c | 716 | unsigned int offset, ihl; |
f2428ed5 | 717 | union nf_inet_addr snet; |
1da177e4 LT |
718 | |
719 | *related = 1; | |
720 | ||
721 | /* reassemble IP fragments */ | |
eddc9ec5 | 722 | if (ip_hdr(skb)->frag_off & htons(IP_MF | IP_OFFSET)) { |
776c729e | 723 | if (ip_vs_gather_frags(skb, IP_DEFRAG_VS_OUT)) |
1da177e4 | 724 | return NF_STOLEN; |
1da177e4 LT |
725 | } |
726 | ||
eddc9ec5 | 727 | iph = ip_hdr(skb); |
1da177e4 LT |
728 | offset = ihl = iph->ihl * 4; |
729 | ic = skb_header_pointer(skb, offset, sizeof(_icmph), &_icmph); | |
730 | if (ic == NULL) | |
731 | return NF_DROP; | |
732 | ||
14d5e834 | 733 | IP_VS_DBG(12, "Outgoing ICMP (%d,%d) %pI4->%pI4\n", |
1da177e4 | 734 | ic->type, ntohs(icmp_id(ic)), |
14d5e834 | 735 | &iph->saddr, &iph->daddr); |
1da177e4 LT |
736 | |
737 | /* | |
738 | * Work through seeing if this is for us. | |
739 | * These checks are supposed to be in an order that means easy | |
740 | * things are checked first to speed up processing.... however | |
741 | * this means that some packets will manage to get a long way | |
742 | * down this stack and then be rejected, but that's life. | |
743 | */ | |
744 | if ((ic->type != ICMP_DEST_UNREACH) && | |
745 | (ic->type != ICMP_SOURCE_QUENCH) && | |
746 | (ic->type != ICMP_TIME_EXCEEDED)) { | |
747 | *related = 0; | |
748 | return NF_ACCEPT; | |
749 | } | |
750 | ||
751 | /* Now find the contained IP header */ | |
752 | offset += sizeof(_icmph); | |
753 | cih = skb_header_pointer(skb, offset, sizeof(_ciph), &_ciph); | |
754 | if (cih == NULL) | |
755 | return NF_ACCEPT; /* The packet looks wrong, ignore */ | |
756 | ||
757 | pp = ip_vs_proto_get(cih->protocol); | |
758 | if (!pp) | |
759 | return NF_ACCEPT; | |
760 | ||
761 | /* Is the embedded protocol header present? */ | |
4412ec49 | 762 | if (unlikely(cih->frag_off & htons(IP_OFFSET) && |
1da177e4 LT |
763 | pp->dont_defrag)) |
764 | return NF_ACCEPT; | |
765 | ||
766 | IP_VS_DBG_PKT(11, pp, skb, offset, "Checking outgoing ICMP for"); | |
767 | ||
768 | offset += cih->ihl * 4; | |
769 | ||
51ef348b | 770 | ip_vs_fill_iphdr(AF_INET, cih, &ciph); |
1da177e4 | 771 | /* The embedded headers contain source and dest in reverse order */ |
51ef348b | 772 | cp = pp->conn_out_get(AF_INET, skb, pp, &ciph, offset, 1); |
1da177e4 LT |
773 | if (!cp) |
774 | return NF_ACCEPT; | |
775 | ||
f2428ed5 SH |
776 | snet.ip = iph->saddr; |
777 | return handle_response_icmp(AF_INET, skb, &snet, cih->protocol, cp, | |
778 | pp, offset, ihl); | |
1da177e4 LT |
779 | } |
780 | ||
2a3b791e JV |
781 | #ifdef CONFIG_IP_VS_IPV6 |
782 | static int ip_vs_out_icmp_v6(struct sk_buff *skb, int *related) | |
783 | { | |
784 | struct ipv6hdr *iph; | |
785 | struct icmp6hdr _icmph, *ic; | |
786 | struct ipv6hdr _ciph, *cih; /* The ip header contained | |
787 | within the ICMP */ | |
788 | struct ip_vs_iphdr ciph; | |
789 | struct ip_vs_conn *cp; | |
790 | struct ip_vs_protocol *pp; | |
f2428ed5 SH |
791 | unsigned int offset; |
792 | union nf_inet_addr snet; | |
2a3b791e JV |
793 | |
794 | *related = 1; | |
795 | ||
796 | /* reassemble IP fragments */ | |
797 | if (ipv6_hdr(skb)->nexthdr == IPPROTO_FRAGMENT) { | |
798 | if (ip_vs_gather_frags_v6(skb, IP_DEFRAG_VS_OUT)) | |
799 | return NF_STOLEN; | |
800 | } | |
801 | ||
802 | iph = ipv6_hdr(skb); | |
803 | offset = sizeof(struct ipv6hdr); | |
804 | ic = skb_header_pointer(skb, offset, sizeof(_icmph), &_icmph); | |
805 | if (ic == NULL) | |
806 | return NF_DROP; | |
807 | ||
5b095d98 | 808 | IP_VS_DBG(12, "Outgoing ICMPv6 (%d,%d) %pI6->%pI6\n", |
2a3b791e | 809 | ic->icmp6_type, ntohs(icmpv6_id(ic)), |
38ff4fa4 | 810 | &iph->saddr, &iph->daddr); |
2a3b791e JV |
811 | |
812 | /* | |
813 | * Work through seeing if this is for us. | |
814 | * These checks are supposed to be in an order that means easy | |
815 | * things are checked first to speed up processing.... however | |
816 | * this means that some packets will manage to get a long way | |
817 | * down this stack and then be rejected, but that's life. | |
818 | */ | |
819 | if ((ic->icmp6_type != ICMPV6_DEST_UNREACH) && | |
820 | (ic->icmp6_type != ICMPV6_PKT_TOOBIG) && | |
821 | (ic->icmp6_type != ICMPV6_TIME_EXCEED)) { | |
822 | *related = 0; | |
823 | return NF_ACCEPT; | |
824 | } | |
825 | ||
826 | /* Now find the contained IP header */ | |
827 | offset += sizeof(_icmph); | |
828 | cih = skb_header_pointer(skb, offset, sizeof(_ciph), &_ciph); | |
829 | if (cih == NULL) | |
830 | return NF_ACCEPT; /* The packet looks wrong, ignore */ | |
831 | ||
832 | pp = ip_vs_proto_get(cih->nexthdr); | |
833 | if (!pp) | |
834 | return NF_ACCEPT; | |
835 | ||
836 | /* Is the embedded protocol header present? */ | |
837 | /* TODO: we don't support fragmentation at the moment anyways */ | |
838 | if (unlikely(cih->nexthdr == IPPROTO_FRAGMENT && pp->dont_defrag)) | |
839 | return NF_ACCEPT; | |
840 | ||
841 | IP_VS_DBG_PKT(11, pp, skb, offset, "Checking outgoing ICMPv6 for"); | |
842 | ||
843 | offset += sizeof(struct ipv6hdr); | |
844 | ||
845 | ip_vs_fill_iphdr(AF_INET6, cih, &ciph); | |
846 | /* The embedded headers contain source and dest in reverse order */ | |
847 | cp = pp->conn_out_get(AF_INET6, skb, pp, &ciph, offset, 1); | |
848 | if (!cp) | |
849 | return NF_ACCEPT; | |
850 | ||
178f5e49 | 851 | ipv6_addr_copy(&snet.in6, &iph->saddr); |
f2428ed5 SH |
852 | return handle_response_icmp(AF_INET6, skb, &snet, cih->nexthdr, cp, |
853 | pp, offset, sizeof(struct ipv6hdr)); | |
2a3b791e JV |
854 | } |
855 | #endif | |
856 | ||
2906f66a VMR |
857 | /* |
858 | * Check if sctp chunc is ABORT chunk | |
859 | */ | |
860 | static inline int is_sctp_abort(const struct sk_buff *skb, int nh_len) | |
861 | { | |
862 | sctp_chunkhdr_t *sch, schunk; | |
863 | sch = skb_header_pointer(skb, nh_len + sizeof(sctp_sctphdr_t), | |
864 | sizeof(schunk), &schunk); | |
865 | if (sch == NULL) | |
866 | return 0; | |
867 | if (sch->type == SCTP_CID_ABORT) | |
868 | return 1; | |
869 | return 0; | |
870 | } | |
871 | ||
2a3b791e | 872 | static inline int is_tcp_reset(const struct sk_buff *skb, int nh_len) |
1da177e4 LT |
873 | { |
874 | struct tcphdr _tcph, *th; | |
875 | ||
2a3b791e | 876 | th = skb_header_pointer(skb, nh_len, sizeof(_tcph), &_tcph); |
1da177e4 LT |
877 | if (th == NULL) |
878 | return 0; | |
879 | return th->rst; | |
880 | } | |
881 | ||
4856c84c MT |
882 | /* Handle response packets: rewrite addresses and send away... |
883 | * Used for NAT and local client. | |
884 | */ | |
885 | static unsigned int | |
886 | handle_response(int af, struct sk_buff *skb, struct ip_vs_protocol *pp, | |
887 | struct ip_vs_conn *cp, int ihl) | |
888 | { | |
889 | IP_VS_DBG_PKT(11, pp, skb, 0, "Outgoing packet"); | |
890 | ||
891 | if (!skb_make_writable(skb, ihl)) | |
892 | goto drop; | |
893 | ||
894 | /* mangle the packet */ | |
895 | if (pp->snat_handler && !pp->snat_handler(skb, pp, cp)) | |
896 | goto drop; | |
897 | ||
898 | #ifdef CONFIG_IP_VS_IPV6 | |
899 | if (af == AF_INET6) | |
900 | ipv6_hdr(skb)->saddr = cp->vaddr.in6; | |
901 | else | |
902 | #endif | |
903 | { | |
904 | ip_hdr(skb)->saddr = cp->vaddr.ip; | |
905 | ip_send_check(ip_hdr(skb)); | |
906 | } | |
907 | ||
908 | /* For policy routing, packets originating from this | |
909 | * machine itself may be routed differently to packets | |
910 | * passing through. We want this packet to be routed as | |
911 | * if it came from this machine itself. So re-compute | |
912 | * the routing information. | |
913 | */ | |
914 | #ifdef CONFIG_IP_VS_IPV6 | |
915 | if (af == AF_INET6) { | |
916 | if (ip6_route_me_harder(skb) != 0) | |
917 | goto drop; | |
918 | } else | |
919 | #endif | |
920 | if (ip_route_me_harder(skb, RTN_LOCAL) != 0) | |
921 | goto drop; | |
922 | ||
4856c84c MT |
923 | IP_VS_DBG_PKT(10, pp, skb, 0, "After SNAT"); |
924 | ||
925 | ip_vs_out_stats(cp, skb); | |
926 | ip_vs_set_state(cp, IP_VS_DIR_OUTPUT, skb, pp); | |
6523ce15 | 927 | ip_vs_update_conntrack(skb, cp, 0); |
4856c84c MT |
928 | ip_vs_conn_put(cp); |
929 | ||
930 | skb->ipvs_property = 1; | |
931 | ||
932 | LeaveFunction(11); | |
933 | return NF_ACCEPT; | |
934 | ||
935 | drop: | |
936 | ip_vs_conn_put(cp); | |
937 | kfree_skb(skb); | |
938 | return NF_STOLEN; | |
939 | } | |
940 | ||
1da177e4 | 941 | /* |
6e23ae2a | 942 | * It is hooked at the NF_INET_FORWARD chain, used only for VS/NAT. |
4856c84c | 943 | * Check if outgoing packet belongs to the established ip_vs_conn. |
1da177e4 LT |
944 | */ |
945 | static unsigned int | |
3db05fea | 946 | ip_vs_out(unsigned int hooknum, struct sk_buff *skb, |
1da177e4 LT |
947 | const struct net_device *in, const struct net_device *out, |
948 | int (*okfn)(struct sk_buff *)) | |
949 | { | |
51ef348b | 950 | struct ip_vs_iphdr iph; |
1da177e4 LT |
951 | struct ip_vs_protocol *pp; |
952 | struct ip_vs_conn *cp; | |
2a3b791e | 953 | int af; |
1da177e4 LT |
954 | |
955 | EnterFunction(11); | |
956 | ||
60678040 | 957 | af = (skb->protocol == htons(ETH_P_IP)) ? AF_INET : AF_INET6; |
2a3b791e | 958 | |
6869c4d8 | 959 | if (skb->ipvs_property) |
1da177e4 LT |
960 | return NF_ACCEPT; |
961 | ||
2a3b791e JV |
962 | ip_vs_fill_iphdr(af, skb_network_header(skb), &iph); |
963 | #ifdef CONFIG_IP_VS_IPV6 | |
964 | if (af == AF_INET6) { | |
965 | if (unlikely(iph.protocol == IPPROTO_ICMPV6)) { | |
966 | int related, verdict = ip_vs_out_icmp_v6(skb, &related); | |
1da177e4 | 967 | |
2a3b791e JV |
968 | if (related) |
969 | return verdict; | |
970 | ip_vs_fill_iphdr(af, skb_network_header(skb), &iph); | |
971 | } | |
972 | } else | |
973 | #endif | |
974 | if (unlikely(iph.protocol == IPPROTO_ICMP)) { | |
975 | int related, verdict = ip_vs_out_icmp(skb, &related); | |
976 | ||
977 | if (related) | |
978 | return verdict; | |
979 | ip_vs_fill_iphdr(af, skb_network_header(skb), &iph); | |
980 | } | |
1da177e4 | 981 | |
51ef348b | 982 | pp = ip_vs_proto_get(iph.protocol); |
1da177e4 LT |
983 | if (unlikely(!pp)) |
984 | return NF_ACCEPT; | |
985 | ||
986 | /* reassemble IP fragments */ | |
2a3b791e JV |
987 | #ifdef CONFIG_IP_VS_IPV6 |
988 | if (af == AF_INET6) { | |
989 | if (unlikely(iph.protocol == IPPROTO_ICMPV6)) { | |
990 | int related, verdict = ip_vs_out_icmp_v6(skb, &related); | |
1da177e4 | 991 | |
2a3b791e JV |
992 | if (related) |
993 | return verdict; | |
994 | ||
995 | ip_vs_fill_iphdr(af, skb_network_header(skb), &iph); | |
996 | } | |
997 | } else | |
998 | #endif | |
999 | if (unlikely(ip_hdr(skb)->frag_off & htons(IP_MF|IP_OFFSET) && | |
1000 | !pp->dont_defrag)) { | |
1001 | if (ip_vs_gather_frags(skb, IP_DEFRAG_VS_OUT)) | |
1002 | return NF_STOLEN; | |
1003 | ||
1004 | ip_vs_fill_iphdr(af, skb_network_header(skb), &iph); | |
1005 | } | |
1da177e4 LT |
1006 | |
1007 | /* | |
1008 | * Check if the packet belongs to an existing entry | |
1009 | */ | |
2a3b791e | 1010 | cp = pp->conn_out_get(af, skb, pp, &iph, iph.len, 0); |
1da177e4 LT |
1011 | |
1012 | if (unlikely(!cp)) { | |
1013 | if (sysctl_ip_vs_nat_icmp_send && | |
1014 | (pp->protocol == IPPROTO_TCP || | |
2906f66a VMR |
1015 | pp->protocol == IPPROTO_UDP || |
1016 | pp->protocol == IPPROTO_SCTP)) { | |
014d730d | 1017 | __be16 _ports[2], *pptr; |
1da177e4 | 1018 | |
51ef348b | 1019 | pptr = skb_header_pointer(skb, iph.len, |
1da177e4 LT |
1020 | sizeof(_ports), _ports); |
1021 | if (pptr == NULL) | |
1022 | return NF_ACCEPT; /* Not for me */ | |
7937df15 JV |
1023 | if (ip_vs_lookup_real_service(af, iph.protocol, |
1024 | &iph.saddr, | |
2a3b791e | 1025 | pptr[0])) { |
1da177e4 LT |
1026 | /* |
1027 | * Notify the real server: there is no | |
1028 | * existing entry if it is not RST | |
1029 | * packet or not TCP packet. | |
1030 | */ | |
2906f66a VMR |
1031 | if ((iph.protocol != IPPROTO_TCP && |
1032 | iph.protocol != IPPROTO_SCTP) | |
1033 | || ((iph.protocol == IPPROTO_TCP | |
1034 | && !is_tcp_reset(skb, iph.len)) | |
1035 | || (iph.protocol == IPPROTO_SCTP | |
1036 | && !is_sctp_abort(skb, | |
1037 | iph.len)))) { | |
2a3b791e JV |
1038 | #ifdef CONFIG_IP_VS_IPV6 |
1039 | if (af == AF_INET6) | |
1040 | icmpv6_send(skb, | |
1041 | ICMPV6_DEST_UNREACH, | |
1042 | ICMPV6_PORT_UNREACH, | |
3ffe533c | 1043 | 0); |
2a3b791e JV |
1044 | else |
1045 | #endif | |
1046 | icmp_send(skb, | |
1047 | ICMP_DEST_UNREACH, | |
1048 | ICMP_PORT_UNREACH, 0); | |
1da177e4 | 1049 | return NF_DROP; |
5af149cc | 1050 | } |
1da177e4 LT |
1051 | } |
1052 | } | |
1053 | IP_VS_DBG_PKT(12, pp, skb, 0, | |
1054 | "packet continues traversal as normal"); | |
1055 | return NF_ACCEPT; | |
1056 | } | |
1057 | ||
4856c84c | 1058 | return handle_response(af, skb, pp, cp, iph.len); |
1da177e4 LT |
1059 | } |
1060 | ||
1061 | ||
1062 | /* | |
1063 | * Handle ICMP messages in the outside-to-inside direction (incoming). | |
1064 | * Find any that might be relevant, check against existing connections, | |
1065 | * forward to the right destination host if relevant. | |
1066 | * Currently handles error types - unreachable, quench, ttl exceeded. | |
1067 | */ | |
e905a9ed | 1068 | static int |
3db05fea | 1069 | ip_vs_in_icmp(struct sk_buff *skb, int *related, unsigned int hooknum) |
1da177e4 | 1070 | { |
1da177e4 LT |
1071 | struct iphdr *iph; |
1072 | struct icmphdr _icmph, *ic; | |
1073 | struct iphdr _ciph, *cih; /* The ip header contained within the ICMP */ | |
51ef348b | 1074 | struct ip_vs_iphdr ciph; |
1da177e4 LT |
1075 | struct ip_vs_conn *cp; |
1076 | struct ip_vs_protocol *pp; | |
1077 | unsigned int offset, ihl, verdict; | |
f2428ed5 | 1078 | union nf_inet_addr snet; |
1da177e4 LT |
1079 | |
1080 | *related = 1; | |
1081 | ||
1082 | /* reassemble IP fragments */ | |
eddc9ec5 | 1083 | if (ip_hdr(skb)->frag_off & htons(IP_MF | IP_OFFSET)) { |
6e23ae2a | 1084 | if (ip_vs_gather_frags(skb, hooknum == NF_INET_LOCAL_IN ? |
776c729e | 1085 | IP_DEFRAG_VS_IN : IP_DEFRAG_VS_FWD)) |
1da177e4 | 1086 | return NF_STOLEN; |
1da177e4 LT |
1087 | } |
1088 | ||
eddc9ec5 | 1089 | iph = ip_hdr(skb); |
1da177e4 LT |
1090 | offset = ihl = iph->ihl * 4; |
1091 | ic = skb_header_pointer(skb, offset, sizeof(_icmph), &_icmph); | |
1092 | if (ic == NULL) | |
1093 | return NF_DROP; | |
1094 | ||
14d5e834 | 1095 | IP_VS_DBG(12, "Incoming ICMP (%d,%d) %pI4->%pI4\n", |
1da177e4 | 1096 | ic->type, ntohs(icmp_id(ic)), |
14d5e834 | 1097 | &iph->saddr, &iph->daddr); |
1da177e4 LT |
1098 | |
1099 | /* | |
1100 | * Work through seeing if this is for us. | |
1101 | * These checks are supposed to be in an order that means easy | |
1102 | * things are checked first to speed up processing.... however | |
1103 | * this means that some packets will manage to get a long way | |
1104 | * down this stack and then be rejected, but that's life. | |
1105 | */ | |
1106 | if ((ic->type != ICMP_DEST_UNREACH) && | |
1107 | (ic->type != ICMP_SOURCE_QUENCH) && | |
1108 | (ic->type != ICMP_TIME_EXCEEDED)) { | |
1109 | *related = 0; | |
1110 | return NF_ACCEPT; | |
1111 | } | |
1112 | ||
1113 | /* Now find the contained IP header */ | |
1114 | offset += sizeof(_icmph); | |
1115 | cih = skb_header_pointer(skb, offset, sizeof(_ciph), &_ciph); | |
1116 | if (cih == NULL) | |
1117 | return NF_ACCEPT; /* The packet looks wrong, ignore */ | |
1118 | ||
1119 | pp = ip_vs_proto_get(cih->protocol); | |
1120 | if (!pp) | |
1121 | return NF_ACCEPT; | |
1122 | ||
1123 | /* Is the embedded protocol header present? */ | |
4412ec49 | 1124 | if (unlikely(cih->frag_off & htons(IP_OFFSET) && |
1da177e4 LT |
1125 | pp->dont_defrag)) |
1126 | return NF_ACCEPT; | |
1127 | ||
1128 | IP_VS_DBG_PKT(11, pp, skb, offset, "Checking incoming ICMP for"); | |
1129 | ||
1130 | offset += cih->ihl * 4; | |
1131 | ||
51ef348b | 1132 | ip_vs_fill_iphdr(AF_INET, cih, &ciph); |
1da177e4 | 1133 | /* The embedded headers contain source and dest in reverse order */ |
51ef348b | 1134 | cp = pp->conn_in_get(AF_INET, skb, pp, &ciph, offset, 1); |
4856c84c MT |
1135 | if (!cp) { |
1136 | /* The packet could also belong to a local client */ | |
1137 | cp = pp->conn_out_get(AF_INET, skb, pp, &ciph, offset, 1); | |
f2428ed5 SH |
1138 | if (cp) { |
1139 | snet.ip = iph->saddr; | |
1140 | return handle_response_icmp(AF_INET, skb, &snet, | |
1141 | cih->protocol, cp, pp, | |
4856c84c | 1142 | offset, ihl); |
f2428ed5 | 1143 | } |
1da177e4 | 1144 | return NF_ACCEPT; |
4856c84c | 1145 | } |
1da177e4 LT |
1146 | |
1147 | verdict = NF_DROP; | |
1148 | ||
1149 | /* Ensure the checksum is correct */ | |
60476372 | 1150 | if (!skb_csum_unnecessary(skb) && ip_vs_checksum_complete(skb, ihl)) { |
1da177e4 | 1151 | /* Failed checksum! */ |
14d5e834 HH |
1152 | IP_VS_DBG(1, "Incoming ICMP: failed checksum from %pI4!\n", |
1153 | &iph->saddr); | |
1da177e4 LT |
1154 | goto out; |
1155 | } | |
1156 | ||
1157 | /* do the statistics and put it back */ | |
1158 | ip_vs_in_stats(cp, skb); | |
1159 | if (IPPROTO_TCP == cih->protocol || IPPROTO_UDP == cih->protocol) | |
1160 | offset += 2 * sizeof(__u16); | |
1161 | verdict = ip_vs_icmp_xmit(skb, cp, pp, offset); | |
1162 | /* do not touch skb anymore */ | |
1163 | ||
1164 | out: | |
1165 | __ip_vs_conn_put(cp); | |
1166 | ||
1167 | return verdict; | |
1168 | } | |
1169 | ||
2a3b791e JV |
1170 | #ifdef CONFIG_IP_VS_IPV6 |
1171 | static int | |
1172 | ip_vs_in_icmp_v6(struct sk_buff *skb, int *related, unsigned int hooknum) | |
1173 | { | |
1174 | struct ipv6hdr *iph; | |
1175 | struct icmp6hdr _icmph, *ic; | |
1176 | struct ipv6hdr _ciph, *cih; /* The ip header contained | |
1177 | within the ICMP */ | |
1178 | struct ip_vs_iphdr ciph; | |
1179 | struct ip_vs_conn *cp; | |
1180 | struct ip_vs_protocol *pp; | |
1181 | unsigned int offset, verdict; | |
f2428ed5 | 1182 | union nf_inet_addr snet; |
2a3b791e JV |
1183 | |
1184 | *related = 1; | |
1185 | ||
1186 | /* reassemble IP fragments */ | |
1187 | if (ipv6_hdr(skb)->nexthdr == IPPROTO_FRAGMENT) { | |
1188 | if (ip_vs_gather_frags_v6(skb, hooknum == NF_INET_LOCAL_IN ? | |
1189 | IP_DEFRAG_VS_IN : | |
1190 | IP_DEFRAG_VS_FWD)) | |
1191 | return NF_STOLEN; | |
1192 | } | |
1193 | ||
1194 | iph = ipv6_hdr(skb); | |
1195 | offset = sizeof(struct ipv6hdr); | |
1196 | ic = skb_header_pointer(skb, offset, sizeof(_icmph), &_icmph); | |
1197 | if (ic == NULL) | |
1198 | return NF_DROP; | |
1199 | ||
5b095d98 | 1200 | IP_VS_DBG(12, "Incoming ICMPv6 (%d,%d) %pI6->%pI6\n", |
2a3b791e | 1201 | ic->icmp6_type, ntohs(icmpv6_id(ic)), |
38ff4fa4 | 1202 | &iph->saddr, &iph->daddr); |
2a3b791e JV |
1203 | |
1204 | /* | |
1205 | * Work through seeing if this is for us. | |
1206 | * These checks are supposed to be in an order that means easy | |
1207 | * things are checked first to speed up processing.... however | |
1208 | * this means that some packets will manage to get a long way | |
1209 | * down this stack and then be rejected, but that's life. | |
1210 | */ | |
1211 | if ((ic->icmp6_type != ICMPV6_DEST_UNREACH) && | |
1212 | (ic->icmp6_type != ICMPV6_PKT_TOOBIG) && | |
1213 | (ic->icmp6_type != ICMPV6_TIME_EXCEED)) { | |
1214 | *related = 0; | |
1215 | return NF_ACCEPT; | |
1216 | } | |
1217 | ||
1218 | /* Now find the contained IP header */ | |
1219 | offset += sizeof(_icmph); | |
1220 | cih = skb_header_pointer(skb, offset, sizeof(_ciph), &_ciph); | |
1221 | if (cih == NULL) | |
1222 | return NF_ACCEPT; /* The packet looks wrong, ignore */ | |
1223 | ||
1224 | pp = ip_vs_proto_get(cih->nexthdr); | |
1225 | if (!pp) | |
1226 | return NF_ACCEPT; | |
1227 | ||
1228 | /* Is the embedded protocol header present? */ | |
1229 | /* TODO: we don't support fragmentation at the moment anyways */ | |
1230 | if (unlikely(cih->nexthdr == IPPROTO_FRAGMENT && pp->dont_defrag)) | |
1231 | return NF_ACCEPT; | |
1232 | ||
1233 | IP_VS_DBG_PKT(11, pp, skb, offset, "Checking incoming ICMPv6 for"); | |
1234 | ||
1235 | offset += sizeof(struct ipv6hdr); | |
1236 | ||
1237 | ip_vs_fill_iphdr(AF_INET6, cih, &ciph); | |
1238 | /* The embedded headers contain source and dest in reverse order */ | |
1239 | cp = pp->conn_in_get(AF_INET6, skb, pp, &ciph, offset, 1); | |
f2428ed5 SH |
1240 | if (!cp) { |
1241 | /* The packet could also belong to a local client */ | |
1242 | cp = pp->conn_out_get(AF_INET6, skb, pp, &ciph, offset, 1); | |
1243 | if (cp) { | |
178f5e49 | 1244 | ipv6_addr_copy(&snet.in6, &iph->saddr); |
f2428ed5 SH |
1245 | return handle_response_icmp(AF_INET6, skb, &snet, |
1246 | cih->nexthdr, | |
1247 | cp, pp, offset, | |
1248 | sizeof(struct ipv6hdr)); | |
1249 | } | |
2a3b791e | 1250 | return NF_ACCEPT; |
f2428ed5 | 1251 | } |
2a3b791e JV |
1252 | |
1253 | verdict = NF_DROP; | |
1254 | ||
1255 | /* do the statistics and put it back */ | |
1256 | ip_vs_in_stats(cp, skb); | |
2906f66a VMR |
1257 | if (IPPROTO_TCP == cih->nexthdr || IPPROTO_UDP == cih->nexthdr || |
1258 | IPPROTO_SCTP == cih->nexthdr) | |
2a3b791e JV |
1259 | offset += 2 * sizeof(__u16); |
1260 | verdict = ip_vs_icmp_xmit_v6(skb, cp, pp, offset); | |
1261 | /* do not touch skb anymore */ | |
1262 | ||
1263 | __ip_vs_conn_put(cp); | |
1264 | ||
1265 | return verdict; | |
1266 | } | |
1267 | #endif | |
1268 | ||
1269 | ||
1da177e4 LT |
1270 | /* |
1271 | * Check if it's for virtual services, look it up, | |
1272 | * and send it on its way... | |
1273 | */ | |
1274 | static unsigned int | |
3db05fea | 1275 | ip_vs_in(unsigned int hooknum, struct sk_buff *skb, |
1da177e4 LT |
1276 | const struct net_device *in, const struct net_device *out, |
1277 | int (*okfn)(struct sk_buff *)) | |
1278 | { | |
51ef348b | 1279 | struct ip_vs_iphdr iph; |
1da177e4 LT |
1280 | struct ip_vs_protocol *pp; |
1281 | struct ip_vs_conn *cp; | |
1e66dafc | 1282 | int ret, restart, af, pkts; |
2a3b791e | 1283 | |
60678040 | 1284 | af = (skb->protocol == htons(ETH_P_IP)) ? AF_INET : AF_INET6; |
51ef348b | 1285 | |
2a3b791e | 1286 | ip_vs_fill_iphdr(af, skb_network_header(skb), &iph); |
1da177e4 LT |
1287 | |
1288 | /* | |
4856c84c MT |
1289 | * Big tappo: only PACKET_HOST, including loopback for local client |
1290 | * Don't handle local packets on IPv6 for now | |
1da177e4 | 1291 | */ |
f2428ed5 | 1292 | if (unlikely(skb->pkt_type != PACKET_HOST)) { |
51ef348b JV |
1293 | IP_VS_DBG_BUF(12, "packet type=%d proto=%d daddr=%s ignored\n", |
1294 | skb->pkt_type, | |
1295 | iph.protocol, | |
2a3b791e | 1296 | IP_VS_DBG_ADDR(af, &iph.daddr)); |
1da177e4 LT |
1297 | return NF_ACCEPT; |
1298 | } | |
1299 | ||
94b26551 JV |
1300 | #ifdef CONFIG_IP_VS_IPV6 |
1301 | if (af == AF_INET6) { | |
1302 | if (unlikely(iph.protocol == IPPROTO_ICMPV6)) { | |
1303 | int related, verdict = ip_vs_in_icmp_v6(skb, &related, hooknum); | |
1da177e4 | 1304 | |
94b26551 JV |
1305 | if (related) |
1306 | return verdict; | |
1307 | ip_vs_fill_iphdr(af, skb_network_header(skb), &iph); | |
1308 | } | |
1309 | } else | |
1310 | #endif | |
1311 | if (unlikely(iph.protocol == IPPROTO_ICMP)) { | |
1312 | int related, verdict = ip_vs_in_icmp(skb, &related, hooknum); | |
1313 | ||
1314 | if (related) | |
1315 | return verdict; | |
1316 | ip_vs_fill_iphdr(af, skb_network_header(skb), &iph); | |
1317 | } | |
1da177e4 LT |
1318 | |
1319 | /* Protocol supported? */ | |
51ef348b | 1320 | pp = ip_vs_proto_get(iph.protocol); |
1da177e4 LT |
1321 | if (unlikely(!pp)) |
1322 | return NF_ACCEPT; | |
1323 | ||
1da177e4 LT |
1324 | /* |
1325 | * Check if the packet belongs to an existing connection entry | |
1326 | */ | |
2a3b791e | 1327 | cp = pp->conn_in_get(af, skb, pp, &iph, iph.len, 0); |
1da177e4 LT |
1328 | |
1329 | if (unlikely(!cp)) { | |
1330 | int v; | |
1331 | ||
4856c84c MT |
1332 | /* For local client packets, it could be a response */ |
1333 | cp = pp->conn_out_get(af, skb, pp, &iph, iph.len, 0); | |
1334 | if (cp) | |
1335 | return handle_response(af, skb, pp, cp, iph.len); | |
1336 | ||
2a3b791e | 1337 | if (!pp->conn_schedule(af, skb, pp, &v, &cp)) |
1da177e4 LT |
1338 | return v; |
1339 | } | |
1340 | ||
1341 | if (unlikely(!cp)) { | |
1342 | /* sorry, all this trouble for a no-hit :) */ | |
1343 | IP_VS_DBG_PKT(12, pp, skb, 0, | |
1344 | "packet continues traversal as normal"); | |
1345 | return NF_ACCEPT; | |
1346 | } | |
1347 | ||
1348 | IP_VS_DBG_PKT(11, pp, skb, 0, "Incoming packet"); | |
1349 | ||
1350 | /* Check the server status */ | |
1351 | if (cp->dest && !(cp->dest->flags & IP_VS_DEST_F_AVAILABLE)) { | |
1352 | /* the destination server is not available */ | |
1353 | ||
1354 | if (sysctl_ip_vs_expire_nodest_conn) { | |
1355 | /* try to expire the connection immediately */ | |
1356 | ip_vs_conn_expire_now(cp); | |
1da177e4 | 1357 | } |
dc8103f2 JA |
1358 | /* don't restart its timer, and silently |
1359 | drop the packet. */ | |
1360 | __ip_vs_conn_put(cp); | |
1da177e4 LT |
1361 | return NF_DROP; |
1362 | } | |
1363 | ||
1364 | ip_vs_in_stats(cp, skb); | |
1365 | restart = ip_vs_set_state(cp, IP_VS_DIR_INPUT, skb, pp); | |
1366 | if (cp->packet_xmit) | |
1367 | ret = cp->packet_xmit(skb, cp, pp); | |
1368 | /* do not touch skb anymore */ | |
1369 | else { | |
1370 | IP_VS_DBG_RL("warning: packet_xmit is null"); | |
1371 | ret = NF_ACCEPT; | |
1372 | } | |
1373 | ||
efac5276 RB |
1374 | /* Increase its packet counter and check if it is needed |
1375 | * to be synchronized | |
1376 | * | |
1377 | * Sync connection if it is about to close to | |
1378 | * encorage the standby servers to update the connections timeout | |
1379 | */ | |
1e66dafc | 1380 | pkts = atomic_add_return(1, &cp->in_pkts); |
2906f66a VMR |
1381 | if (af == AF_INET && (ip_vs_sync_state & IP_VS_STATE_MASTER) && |
1382 | cp->protocol == IPPROTO_SCTP) { | |
1383 | if ((cp->state == IP_VS_SCTP_S_ESTABLISHED && | |
1384 | (atomic_read(&cp->in_pkts) % | |
1385 | sysctl_ip_vs_sync_threshold[1] | |
1386 | == sysctl_ip_vs_sync_threshold[0])) || | |
1387 | (cp->old_state != cp->state && | |
1388 | ((cp->state == IP_VS_SCTP_S_CLOSED) || | |
1389 | (cp->state == IP_VS_SCTP_S_SHUT_ACK_CLI) || | |
1390 | (cp->state == IP_VS_SCTP_S_SHUT_ACK_SER)))) { | |
1391 | ip_vs_sync_conn(cp); | |
1392 | goto out; | |
1393 | } | |
1394 | } | |
1395 | ||
c6883f58 JV |
1396 | if (af == AF_INET && |
1397 | (ip_vs_sync_state & IP_VS_STATE_MASTER) && | |
efac5276 RB |
1398 | (((cp->protocol != IPPROTO_TCP || |
1399 | cp->state == IP_VS_TCP_S_ESTABLISHED) && | |
1e66dafc | 1400 | (pkts % sysctl_ip_vs_sync_threshold[1] |
efac5276 RB |
1401 | == sysctl_ip_vs_sync_threshold[0])) || |
1402 | ((cp->protocol == IPPROTO_TCP) && (cp->old_state != cp->state) && | |
1403 | ((cp->state == IP_VS_TCP_S_FIN_WAIT) || | |
9abfe315 | 1404 | (cp->state == IP_VS_TCP_S_CLOSE) || |
9d3a0de7 RB |
1405 | (cp->state == IP_VS_TCP_S_CLOSE_WAIT) || |
1406 | (cp->state == IP_VS_TCP_S_TIME_WAIT))))) | |
1da177e4 | 1407 | ip_vs_sync_conn(cp); |
2906f66a | 1408 | out: |
efac5276 | 1409 | cp->old_state = cp->state; |
1da177e4 LT |
1410 | |
1411 | ip_vs_conn_put(cp); | |
1412 | return ret; | |
1413 | } | |
1414 | ||
1415 | ||
1416 | /* | |
6e23ae2a | 1417 | * It is hooked at the NF_INET_FORWARD chain, in order to catch ICMP |
1da177e4 LT |
1418 | * related packets destined for 0.0.0.0/0. |
1419 | * When fwmark-based virtual service is used, such as transparent | |
1420 | * cache cluster, TCP packets can be marked and routed to ip_vs_in, | |
1421 | * but ICMP destined for 0.0.0.0/0 cannot not be easily marked and | |
6e23ae2a | 1422 | * sent to ip_vs_in_icmp. So, catch them at the NF_INET_FORWARD chain |
1da177e4 LT |
1423 | * and send them to ip_vs_in_icmp. |
1424 | */ | |
1425 | static unsigned int | |
3db05fea | 1426 | ip_vs_forward_icmp(unsigned int hooknum, struct sk_buff *skb, |
1da177e4 LT |
1427 | const struct net_device *in, const struct net_device *out, |
1428 | int (*okfn)(struct sk_buff *)) | |
1429 | { | |
1430 | int r; | |
1431 | ||
3db05fea | 1432 | if (ip_hdr(skb)->protocol != IPPROTO_ICMP) |
1da177e4 LT |
1433 | return NF_ACCEPT; |
1434 | ||
3db05fea | 1435 | return ip_vs_in_icmp(skb, &r, hooknum); |
1da177e4 LT |
1436 | } |
1437 | ||
2a3b791e JV |
1438 | #ifdef CONFIG_IP_VS_IPV6 |
1439 | static unsigned int | |
1440 | ip_vs_forward_icmp_v6(unsigned int hooknum, struct sk_buff *skb, | |
1441 | const struct net_device *in, const struct net_device *out, | |
1442 | int (*okfn)(struct sk_buff *)) | |
1443 | { | |
1444 | int r; | |
1445 | ||
1446 | if (ipv6_hdr(skb)->nexthdr != IPPROTO_ICMPV6) | |
1447 | return NF_ACCEPT; | |
1448 | ||
1449 | return ip_vs_in_icmp_v6(skb, &r, hooknum); | |
1450 | } | |
1451 | #endif | |
1452 | ||
1da177e4 | 1453 | |
1999414a | 1454 | static struct nf_hook_ops ip_vs_ops[] __read_mostly = { |
41c5b317 PM |
1455 | /* After packet filtering, forward packet through VS/DR, VS/TUN, |
1456 | * or VS/NAT(change destination), so that filtering rules can be | |
1457 | * applied to IPVS. */ | |
1458 | { | |
1459 | .hook = ip_vs_in, | |
1460 | .owner = THIS_MODULE, | |
1461 | .pf = PF_INET, | |
1462 | .hooknum = NF_INET_LOCAL_IN, | |
1463 | .priority = 100, | |
1464 | }, | |
1465 | /* After packet filtering, change source only for VS/NAT */ | |
1466 | { | |
1467 | .hook = ip_vs_out, | |
1468 | .owner = THIS_MODULE, | |
1469 | .pf = PF_INET, | |
1470 | .hooknum = NF_INET_FORWARD, | |
1471 | .priority = 100, | |
1472 | }, | |
1473 | /* After packet filtering (but before ip_vs_out_icmp), catch icmp | |
1474 | * destined for 0.0.0.0/0, which is for incoming IPVS connections */ | |
1475 | { | |
1476 | .hook = ip_vs_forward_icmp, | |
1477 | .owner = THIS_MODULE, | |
1478 | .pf = PF_INET, | |
1479 | .hooknum = NF_INET_FORWARD, | |
1480 | .priority = 99, | |
1481 | }, | |
473b23d3 JV |
1482 | #ifdef CONFIG_IP_VS_IPV6 |
1483 | /* After packet filtering, forward packet through VS/DR, VS/TUN, | |
1484 | * or VS/NAT(change destination), so that filtering rules can be | |
1485 | * applied to IPVS. */ | |
1486 | { | |
1487 | .hook = ip_vs_in, | |
1488 | .owner = THIS_MODULE, | |
1489 | .pf = PF_INET6, | |
1490 | .hooknum = NF_INET_LOCAL_IN, | |
1491 | .priority = 100, | |
1492 | }, | |
1493 | /* After packet filtering, change source only for VS/NAT */ | |
1494 | { | |
1495 | .hook = ip_vs_out, | |
1496 | .owner = THIS_MODULE, | |
1497 | .pf = PF_INET6, | |
1498 | .hooknum = NF_INET_FORWARD, | |
1499 | .priority = 100, | |
1500 | }, | |
1501 | /* After packet filtering (but before ip_vs_out_icmp), catch icmp | |
1502 | * destined for 0.0.0.0/0, which is for incoming IPVS connections */ | |
1503 | { | |
1504 | .hook = ip_vs_forward_icmp_v6, | |
1505 | .owner = THIS_MODULE, | |
1506 | .pf = PF_INET6, | |
1507 | .hooknum = NF_INET_FORWARD, | |
1508 | .priority = 99, | |
1509 | }, | |
473b23d3 | 1510 | #endif |
1da177e4 LT |
1511 | }; |
1512 | ||
1513 | ||
1514 | /* | |
1515 | * Initialize IP Virtual Server | |
1516 | */ | |
1517 | static int __init ip_vs_init(void) | |
1518 | { | |
1519 | int ret; | |
1520 | ||
a919cf4b SW |
1521 | ip_vs_estimator_init(); |
1522 | ||
1da177e4 LT |
1523 | ret = ip_vs_control_init(); |
1524 | if (ret < 0) { | |
1e3e238e | 1525 | pr_err("can't setup control.\n"); |
a919cf4b | 1526 | goto cleanup_estimator; |
1da177e4 LT |
1527 | } |
1528 | ||
1529 | ip_vs_protocol_init(); | |
1530 | ||
1531 | ret = ip_vs_app_init(); | |
1532 | if (ret < 0) { | |
1e3e238e | 1533 | pr_err("can't setup application helper.\n"); |
1da177e4 LT |
1534 | goto cleanup_protocol; |
1535 | } | |
1536 | ||
1537 | ret = ip_vs_conn_init(); | |
1538 | if (ret < 0) { | |
1e3e238e | 1539 | pr_err("can't setup connection table.\n"); |
1da177e4 LT |
1540 | goto cleanup_app; |
1541 | } | |
1542 | ||
41c5b317 | 1543 | ret = nf_register_hooks(ip_vs_ops, ARRAY_SIZE(ip_vs_ops)); |
1da177e4 | 1544 | if (ret < 0) { |
1e3e238e | 1545 | pr_err("can't register hooks.\n"); |
1da177e4 LT |
1546 | goto cleanup_conn; |
1547 | } | |
1548 | ||
1e3e238e | 1549 | pr_info("ipvs loaded.\n"); |
1da177e4 LT |
1550 | return ret; |
1551 | ||
1da177e4 LT |
1552 | cleanup_conn: |
1553 | ip_vs_conn_cleanup(); | |
1554 | cleanup_app: | |
1555 | ip_vs_app_cleanup(); | |
1556 | cleanup_protocol: | |
1557 | ip_vs_protocol_cleanup(); | |
1558 | ip_vs_control_cleanup(); | |
a919cf4b SW |
1559 | cleanup_estimator: |
1560 | ip_vs_estimator_cleanup(); | |
1da177e4 LT |
1561 | return ret; |
1562 | } | |
1563 | ||
1564 | static void __exit ip_vs_cleanup(void) | |
1565 | { | |
41c5b317 | 1566 | nf_unregister_hooks(ip_vs_ops, ARRAY_SIZE(ip_vs_ops)); |
1da177e4 LT |
1567 | ip_vs_conn_cleanup(); |
1568 | ip_vs_app_cleanup(); | |
1569 | ip_vs_protocol_cleanup(); | |
1570 | ip_vs_control_cleanup(); | |
a919cf4b | 1571 | ip_vs_estimator_cleanup(); |
1e3e238e | 1572 | pr_info("ipvs unloaded.\n"); |
1da177e4 LT |
1573 | } |
1574 | ||
1575 | module_init(ip_vs_init); | |
1576 | module_exit(ip_vs_cleanup); | |
1577 | MODULE_LICENSE("GPL"); |