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1 | /* | |
2 | * IPVS An implementation of the IP virtual server support for the | |
3 | * LINUX operating system. IPVS is now implemented as a module | |
4 | * over the Netfilter framework. IPVS can be used to build a | |
5 | * high-performance and highly available server based on a | |
6 | * cluster of servers. | |
7 | * | |
8 | * 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 | |
23 | * Harald Welte don't use nfcache | |
24 | * | |
25 | */ | |
26 | ||
27 | #define KMSG_COMPONENT "IPVS" | |
28 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
29 | ||
30 | #include <linux/module.h> | |
31 | #include <linux/kernel.h> | |
32 | #include <linux/ip.h> | |
33 | #include <linux/tcp.h> | |
34 | #include <linux/sctp.h> | |
35 | #include <linux/icmp.h> | |
36 | #include <linux/slab.h> | |
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 | #include <net/ip6_checksum.h> | |
44 | #include <net/netns/generic.h> /* net_generic() */ | |
45 | ||
46 | #include <linux/netfilter.h> | |
47 | #include <linux/netfilter_ipv4.h> | |
48 | ||
49 | #ifdef CONFIG_IP_VS_IPV6 | |
50 | #include <net/ipv6.h> | |
51 | #include <linux/netfilter_ipv6.h> | |
52 | #include <net/ip6_route.h> | |
53 | #endif | |
54 | ||
55 | #include <net/ip_vs.h> | |
56 | ||
57 | ||
58 | EXPORT_SYMBOL(register_ip_vs_scheduler); | |
59 | EXPORT_SYMBOL(unregister_ip_vs_scheduler); | |
60 | EXPORT_SYMBOL(ip_vs_proto_name); | |
61 | EXPORT_SYMBOL(ip_vs_conn_new); | |
62 | EXPORT_SYMBOL(ip_vs_conn_in_get); | |
63 | EXPORT_SYMBOL(ip_vs_conn_out_get); | |
64 | #ifdef CONFIG_IP_VS_PROTO_TCP | |
65 | EXPORT_SYMBOL(ip_vs_tcp_conn_listen); | |
66 | #endif | |
67 | EXPORT_SYMBOL(ip_vs_conn_put); | |
68 | #ifdef CONFIG_IP_VS_DEBUG | |
69 | EXPORT_SYMBOL(ip_vs_get_debug_level); | |
70 | #endif | |
71 | ||
72 | int ip_vs_net_id __read_mostly; | |
73 | #ifdef IP_VS_GENERIC_NETNS | |
74 | EXPORT_SYMBOL(ip_vs_net_id); | |
75 | #endif | |
76 | /* netns cnt used for uniqueness */ | |
77 | static atomic_t ipvs_netns_cnt = ATOMIC_INIT(0); | |
78 | ||
79 | /* ID used in ICMP lookups */ | |
80 | #define icmp_id(icmph) (((icmph)->un).echo.id) | |
81 | #define icmpv6_id(icmph) (icmph->icmp6_dataun.u_echo.identifier) | |
82 | ||
83 | const char *ip_vs_proto_name(unsigned proto) | |
84 | { | |
85 | static char buf[20]; | |
86 | ||
87 | switch (proto) { | |
88 | case IPPROTO_IP: | |
89 | return "IP"; | |
90 | case IPPROTO_UDP: | |
91 | return "UDP"; | |
92 | case IPPROTO_TCP: | |
93 | return "TCP"; | |
94 | case IPPROTO_SCTP: | |
95 | return "SCTP"; | |
96 | case IPPROTO_ICMP: | |
97 | return "ICMP"; | |
98 | #ifdef CONFIG_IP_VS_IPV6 | |
99 | case IPPROTO_ICMPV6: | |
100 | return "ICMPv6"; | |
101 | #endif | |
102 | default: | |
103 | sprintf(buf, "IP_%d", proto); | |
104 | return buf; | |
105 | } | |
106 | } | |
107 | ||
108 | void ip_vs_init_hash_table(struct list_head *table, int rows) | |
109 | { | |
110 | while (--rows >= 0) | |
111 | INIT_LIST_HEAD(&table[rows]); | |
112 | } | |
113 | ||
114 | static inline void | |
115 | ip_vs_in_stats(struct ip_vs_conn *cp, struct sk_buff *skb) | |
116 | { | |
117 | struct ip_vs_dest *dest = cp->dest; | |
118 | struct netns_ipvs *ipvs = net_ipvs(skb_net(skb)); | |
119 | ||
120 | if (dest && (dest->flags & IP_VS_DEST_F_AVAILABLE)) { | |
121 | struct ip_vs_cpu_stats *s; | |
122 | ||
123 | s = this_cpu_ptr(dest->stats.cpustats); | |
124 | s->ustats.inpkts++; | |
125 | u64_stats_update_begin(&s->syncp); | |
126 | s->ustats.inbytes += skb->len; | |
127 | u64_stats_update_end(&s->syncp); | |
128 | ||
129 | s = this_cpu_ptr(dest->svc->stats.cpustats); | |
130 | s->ustats.inpkts++; | |
131 | u64_stats_update_begin(&s->syncp); | |
132 | s->ustats.inbytes += skb->len; | |
133 | u64_stats_update_end(&s->syncp); | |
134 | ||
135 | s = this_cpu_ptr(ipvs->cpustats); | |
136 | s->ustats.inpkts++; | |
137 | u64_stats_update_begin(&s->syncp); | |
138 | s->ustats.inbytes += skb->len; | |
139 | u64_stats_update_end(&s->syncp); | |
140 | } | |
141 | } | |
142 | ||
143 | ||
144 | static inline void | |
145 | ip_vs_out_stats(struct ip_vs_conn *cp, struct sk_buff *skb) | |
146 | { | |
147 | struct ip_vs_dest *dest = cp->dest; | |
148 | struct netns_ipvs *ipvs = net_ipvs(skb_net(skb)); | |
149 | ||
150 | if (dest && (dest->flags & IP_VS_DEST_F_AVAILABLE)) { | |
151 | struct ip_vs_cpu_stats *s; | |
152 | ||
153 | s = this_cpu_ptr(dest->stats.cpustats); | |
154 | s->ustats.outpkts++; | |
155 | u64_stats_update_begin(&s->syncp); | |
156 | s->ustats.outbytes += skb->len; | |
157 | u64_stats_update_end(&s->syncp); | |
158 | ||
159 | s = this_cpu_ptr(dest->svc->stats.cpustats); | |
160 | s->ustats.outpkts++; | |
161 | u64_stats_update_begin(&s->syncp); | |
162 | s->ustats.outbytes += skb->len; | |
163 | u64_stats_update_end(&s->syncp); | |
164 | ||
165 | s = this_cpu_ptr(ipvs->cpustats); | |
166 | s->ustats.outpkts++; | |
167 | u64_stats_update_begin(&s->syncp); | |
168 | s->ustats.outbytes += skb->len; | |
169 | u64_stats_update_end(&s->syncp); | |
170 | } | |
171 | } | |
172 | ||
173 | ||
174 | static inline void | |
175 | ip_vs_conn_stats(struct ip_vs_conn *cp, struct ip_vs_service *svc) | |
176 | { | |
177 | struct netns_ipvs *ipvs = net_ipvs(svc->net); | |
178 | struct ip_vs_cpu_stats *s; | |
179 | ||
180 | s = this_cpu_ptr(cp->dest->stats.cpustats); | |
181 | s->ustats.conns++; | |
182 | ||
183 | s = this_cpu_ptr(svc->stats.cpustats); | |
184 | s->ustats.conns++; | |
185 | ||
186 | s = this_cpu_ptr(ipvs->cpustats); | |
187 | s->ustats.conns++; | |
188 | } | |
189 | ||
190 | ||
191 | static inline int | |
192 | ip_vs_set_state(struct ip_vs_conn *cp, int direction, | |
193 | const struct sk_buff *skb, | |
194 | struct ip_vs_proto_data *pd) | |
195 | { | |
196 | if (unlikely(!pd->pp->state_transition)) | |
197 | return 0; | |
198 | return pd->pp->state_transition(cp, direction, skb, pd); | |
199 | } | |
200 | ||
201 | static inline int | |
202 | ip_vs_conn_fill_param_persist(const struct ip_vs_service *svc, | |
203 | struct sk_buff *skb, int protocol, | |
204 | const union nf_inet_addr *caddr, __be16 cport, | |
205 | const union nf_inet_addr *vaddr, __be16 vport, | |
206 | struct ip_vs_conn_param *p) | |
207 | { | |
208 | ip_vs_conn_fill_param(svc->net, svc->af, protocol, caddr, cport, vaddr, | |
209 | vport, p); | |
210 | p->pe = svc->pe; | |
211 | if (p->pe && p->pe->fill_param) | |
212 | return p->pe->fill_param(p, skb); | |
213 | ||
214 | return 0; | |
215 | } | |
216 | ||
217 | /* | |
218 | * IPVS persistent scheduling function | |
219 | * It creates a connection entry according to its template if exists, | |
220 | * or selects a server and creates a connection entry plus a template. | |
221 | * Locking: we are svc user (svc->refcnt), so we hold all dests too | |
222 | * Protocols supported: TCP, UDP | |
223 | */ | |
224 | static struct ip_vs_conn * | |
225 | ip_vs_sched_persist(struct ip_vs_service *svc, | |
226 | struct sk_buff *skb, | |
227 | __be16 src_port, __be16 dst_port, int *ignored) | |
228 | { | |
229 | struct ip_vs_conn *cp = NULL; | |
230 | struct ip_vs_iphdr iph; | |
231 | struct ip_vs_dest *dest; | |
232 | struct ip_vs_conn *ct; | |
233 | __be16 dport = 0; /* destination port to forward */ | |
234 | unsigned int flags; | |
235 | struct ip_vs_conn_param param; | |
236 | union nf_inet_addr snet; /* source network of the client, | |
237 | after masking */ | |
238 | ||
239 | ip_vs_fill_iphdr(svc->af, skb_network_header(skb), &iph); | |
240 | ||
241 | /* Mask saddr with the netmask to adjust template granularity */ | |
242 | #ifdef CONFIG_IP_VS_IPV6 | |
243 | if (svc->af == AF_INET6) | |
244 | ipv6_addr_prefix(&snet.in6, &iph.saddr.in6, svc->netmask); | |
245 | else | |
246 | #endif | |
247 | snet.ip = iph.saddr.ip & svc->netmask; | |
248 | ||
249 | IP_VS_DBG_BUF(6, "p-schedule: src %s:%u dest %s:%u " | |
250 | "mnet %s\n", | |
251 | IP_VS_DBG_ADDR(svc->af, &iph.saddr), ntohs(src_port), | |
252 | IP_VS_DBG_ADDR(svc->af, &iph.daddr), ntohs(dst_port), | |
253 | IP_VS_DBG_ADDR(svc->af, &snet)); | |
254 | ||
255 | /* | |
256 | * As far as we know, FTP is a very complicated network protocol, and | |
257 | * it uses control connection and data connections. For active FTP, | |
258 | * FTP server initialize data connection to the client, its source port | |
259 | * is often 20. For passive FTP, FTP server tells the clients the port | |
260 | * that it passively listens to, and the client issues the data | |
261 | * connection. In the tunneling or direct routing mode, the load | |
262 | * balancer is on the client-to-server half of connection, the port | |
263 | * number is unknown to the load balancer. So, a conn template like | |
264 | * <caddr, 0, vaddr, 0, daddr, 0> is created for persistent FTP | |
265 | * service, and a template like <caddr, 0, vaddr, vport, daddr, dport> | |
266 | * is created for other persistent services. | |
267 | */ | |
268 | { | |
269 | int protocol = iph.protocol; | |
270 | const union nf_inet_addr *vaddr = &iph.daddr; | |
271 | const union nf_inet_addr fwmark = { .ip = htonl(svc->fwmark) }; | |
272 | __be16 vport = 0; | |
273 | ||
274 | if (dst_port == svc->port) { | |
275 | /* non-FTP template: | |
276 | * <protocol, caddr, 0, vaddr, vport, daddr, dport> | |
277 | * FTP template: | |
278 | * <protocol, caddr, 0, vaddr, 0, daddr, 0> | |
279 | */ | |
280 | if (svc->port != FTPPORT) | |
281 | vport = dst_port; | |
282 | } else { | |
283 | /* Note: persistent fwmark-based services and | |
284 | * persistent port zero service are handled here. | |
285 | * fwmark template: | |
286 | * <IPPROTO_IP,caddr,0,fwmark,0,daddr,0> | |
287 | * port zero template: | |
288 | * <protocol,caddr,0,vaddr,0,daddr,0> | |
289 | */ | |
290 | if (svc->fwmark) { | |
291 | protocol = IPPROTO_IP; | |
292 | vaddr = &fwmark; | |
293 | } | |
294 | } | |
295 | /* return *ignored = -1 so NF_DROP can be used */ | |
296 | if (ip_vs_conn_fill_param_persist(svc, skb, protocol, &snet, 0, | |
297 | vaddr, vport, ¶m) < 0) { | |
298 | *ignored = -1; | |
299 | return NULL; | |
300 | } | |
301 | } | |
302 | ||
303 | /* Check if a template already exists */ | |
304 | ct = ip_vs_ct_in_get(¶m); | |
305 | if (!ct || !ip_vs_check_template(ct)) { | |
306 | /* | |
307 | * No template found or the dest of the connection | |
308 | * template is not available. | |
309 | * return *ignored=0 i.e. ICMP and NF_DROP | |
310 | */ | |
311 | dest = svc->scheduler->schedule(svc, skb); | |
312 | if (!dest) { | |
313 | IP_VS_DBG(1, "p-schedule: no dest found.\n"); | |
314 | kfree(param.pe_data); | |
315 | *ignored = 0; | |
316 | return NULL; | |
317 | } | |
318 | ||
319 | if (dst_port == svc->port && svc->port != FTPPORT) | |
320 | dport = dest->port; | |
321 | ||
322 | /* Create a template | |
323 | * This adds param.pe_data to the template, | |
324 | * and thus param.pe_data will be destroyed | |
325 | * when the template expires */ | |
326 | ct = ip_vs_conn_new(¶m, &dest->addr, dport, | |
327 | IP_VS_CONN_F_TEMPLATE, dest, skb->mark); | |
328 | if (ct == NULL) { | |
329 | kfree(param.pe_data); | |
330 | *ignored = -1; | |
331 | return NULL; | |
332 | } | |
333 | ||
334 | ct->timeout = svc->timeout; | |
335 | } else { | |
336 | /* set destination with the found template */ | |
337 | dest = ct->dest; | |
338 | kfree(param.pe_data); | |
339 | } | |
340 | ||
341 | dport = dst_port; | |
342 | if (dport == svc->port && dest->port) | |
343 | dport = dest->port; | |
344 | ||
345 | flags = (svc->flags & IP_VS_SVC_F_ONEPACKET | |
346 | && iph.protocol == IPPROTO_UDP)? | |
347 | IP_VS_CONN_F_ONE_PACKET : 0; | |
348 | ||
349 | /* | |
350 | * Create a new connection according to the template | |
351 | */ | |
352 | ip_vs_conn_fill_param(svc->net, svc->af, iph.protocol, &iph.saddr, | |
353 | src_port, &iph.daddr, dst_port, ¶m); | |
354 | ||
355 | cp = ip_vs_conn_new(¶m, &dest->addr, dport, flags, dest, skb->mark); | |
356 | if (cp == NULL) { | |
357 | ip_vs_conn_put(ct); | |
358 | *ignored = -1; | |
359 | return NULL; | |
360 | } | |
361 | ||
362 | /* | |
363 | * Add its control | |
364 | */ | |
365 | ip_vs_control_add(cp, ct); | |
366 | ip_vs_conn_put(ct); | |
367 | ||
368 | ip_vs_conn_stats(cp, svc); | |
369 | return cp; | |
370 | } | |
371 | ||
372 | ||
373 | /* | |
374 | * IPVS main scheduling function | |
375 | * It selects a server according to the virtual service, and | |
376 | * creates a connection entry. | |
377 | * Protocols supported: TCP, UDP | |
378 | * | |
379 | * Usage of *ignored | |
380 | * | |
381 | * 1 : protocol tried to schedule (eg. on SYN), found svc but the | |
382 | * svc/scheduler decides that this packet should be accepted with | |
383 | * NF_ACCEPT because it must not be scheduled. | |
384 | * | |
385 | * 0 : scheduler can not find destination, so try bypass or | |
386 | * return ICMP and then NF_DROP (ip_vs_leave). | |
387 | * | |
388 | * -1 : scheduler tried to schedule but fatal error occurred, eg. | |
389 | * ip_vs_conn_new failure (ENOMEM) or ip_vs_sip_fill_param | |
390 | * failure such as missing Call-ID, ENOMEM on skb_linearize | |
391 | * or pe_data. In this case we should return NF_DROP without | |
392 | * any attempts to send ICMP with ip_vs_leave. | |
393 | */ | |
394 | struct ip_vs_conn * | |
395 | ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb, | |
396 | struct ip_vs_proto_data *pd, int *ignored) | |
397 | { | |
398 | struct ip_vs_protocol *pp = pd->pp; | |
399 | struct ip_vs_conn *cp = NULL; | |
400 | struct ip_vs_iphdr iph; | |
401 | struct ip_vs_dest *dest; | |
402 | __be16 _ports[2], *pptr; | |
403 | unsigned int flags; | |
404 | ||
405 | *ignored = 1; | |
406 | ip_vs_fill_iphdr(svc->af, skb_network_header(skb), &iph); | |
407 | pptr = skb_header_pointer(skb, iph.len, sizeof(_ports), _ports); | |
408 | if (pptr == NULL) | |
409 | return NULL; | |
410 | ||
411 | /* | |
412 | * FTPDATA needs this check when using local real server. | |
413 | * Never schedule Active FTPDATA connections from real server. | |
414 | * For LVS-NAT they must be already created. For other methods | |
415 | * with persistence the connection is created on SYN+ACK. | |
416 | */ | |
417 | if (pptr[0] == FTPDATA) { | |
418 | IP_VS_DBG_PKT(12, svc->af, pp, skb, 0, | |
419 | "Not scheduling FTPDATA"); | |
420 | return NULL; | |
421 | } | |
422 | ||
423 | /* | |
424 | * Do not schedule replies from local real server. | |
425 | */ | |
426 | if ((!skb->dev || skb->dev->flags & IFF_LOOPBACK) && | |
427 | (cp = pp->conn_in_get(svc->af, skb, &iph, iph.len, 1))) { | |
428 | IP_VS_DBG_PKT(12, svc->af, pp, skb, 0, | |
429 | "Not scheduling reply for existing connection"); | |
430 | __ip_vs_conn_put(cp); | |
431 | return NULL; | |
432 | } | |
433 | ||
434 | /* | |
435 | * Persistent service | |
436 | */ | |
437 | if (svc->flags & IP_VS_SVC_F_PERSISTENT) | |
438 | return ip_vs_sched_persist(svc, skb, pptr[0], pptr[1], ignored); | |
439 | ||
440 | *ignored = 0; | |
441 | ||
442 | /* | |
443 | * Non-persistent service | |
444 | */ | |
445 | if (!svc->fwmark && pptr[1] != svc->port) { | |
446 | if (!svc->port) | |
447 | pr_err("Schedule: port zero only supported " | |
448 | "in persistent services, " | |
449 | "check your ipvs configuration\n"); | |
450 | return NULL; | |
451 | } | |
452 | ||
453 | dest = svc->scheduler->schedule(svc, skb); | |
454 | if (dest == NULL) { | |
455 | IP_VS_DBG(1, "Schedule: no dest found.\n"); | |
456 | return NULL; | |
457 | } | |
458 | ||
459 | flags = (svc->flags & IP_VS_SVC_F_ONEPACKET | |
460 | && iph.protocol == IPPROTO_UDP)? | |
461 | IP_VS_CONN_F_ONE_PACKET : 0; | |
462 | ||
463 | /* | |
464 | * Create a connection entry. | |
465 | */ | |
466 | { | |
467 | struct ip_vs_conn_param p; | |
468 | ||
469 | ip_vs_conn_fill_param(svc->net, svc->af, iph.protocol, | |
470 | &iph.saddr, pptr[0], &iph.daddr, pptr[1], | |
471 | &p); | |
472 | cp = ip_vs_conn_new(&p, &dest->addr, | |
473 | dest->port ? dest->port : pptr[1], | |
474 | flags, dest, skb->mark); | |
475 | if (!cp) { | |
476 | *ignored = -1; | |
477 | return NULL; | |
478 | } | |
479 | } | |
480 | ||
481 | IP_VS_DBG_BUF(6, "Schedule fwd:%c c:%s:%u v:%s:%u " | |
482 | "d:%s:%u conn->flags:%X conn->refcnt:%d\n", | |
483 | ip_vs_fwd_tag(cp), | |
484 | IP_VS_DBG_ADDR(svc->af, &cp->caddr), ntohs(cp->cport), | |
485 | IP_VS_DBG_ADDR(svc->af, &cp->vaddr), ntohs(cp->vport), | |
486 | IP_VS_DBG_ADDR(svc->af, &cp->daddr), ntohs(cp->dport), | |
487 | cp->flags, atomic_read(&cp->refcnt)); | |
488 | ||
489 | ip_vs_conn_stats(cp, svc); | |
490 | return cp; | |
491 | } | |
492 | ||
493 | ||
494 | /* | |
495 | * Pass or drop the packet. | |
496 | * Called by ip_vs_in, when the virtual service is available but | |
497 | * no destination is available for a new connection. | |
498 | */ | |
499 | int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb, | |
500 | struct ip_vs_proto_data *pd) | |
501 | { | |
502 | struct net *net; | |
503 | struct netns_ipvs *ipvs; | |
504 | __be16 _ports[2], *pptr; | |
505 | struct ip_vs_iphdr iph; | |
506 | int unicast; | |
507 | ||
508 | ip_vs_fill_iphdr(svc->af, skb_network_header(skb), &iph); | |
509 | ||
510 | pptr = skb_header_pointer(skb, iph.len, sizeof(_ports), _ports); | |
511 | if (pptr == NULL) { | |
512 | ip_vs_service_put(svc); | |
513 | return NF_DROP; | |
514 | } | |
515 | net = skb_net(skb); | |
516 | ||
517 | #ifdef CONFIG_IP_VS_IPV6 | |
518 | if (svc->af == AF_INET6) | |
519 | unicast = ipv6_addr_type(&iph.daddr.in6) & IPV6_ADDR_UNICAST; | |
520 | else | |
521 | #endif | |
522 | unicast = (inet_addr_type(net, iph.daddr.ip) == RTN_UNICAST); | |
523 | ||
524 | /* if it is fwmark-based service, the cache_bypass sysctl is up | |
525 | and the destination is a non-local unicast, then create | |
526 | a cache_bypass connection entry */ | |
527 | ipvs = net_ipvs(net); | |
528 | if (ipvs->sysctl_cache_bypass && svc->fwmark && unicast) { | |
529 | int ret, cs; | |
530 | struct ip_vs_conn *cp; | |
531 | unsigned int flags = (svc->flags & IP_VS_SVC_F_ONEPACKET && | |
532 | iph.protocol == IPPROTO_UDP)? | |
533 | IP_VS_CONN_F_ONE_PACKET : 0; | |
534 | union nf_inet_addr daddr = { .all = { 0, 0, 0, 0 } }; | |
535 | ||
536 | ip_vs_service_put(svc); | |
537 | ||
538 | /* create a new connection entry */ | |
539 | IP_VS_DBG(6, "%s(): create a cache_bypass entry\n", __func__); | |
540 | { | |
541 | struct ip_vs_conn_param p; | |
542 | ip_vs_conn_fill_param(svc->net, svc->af, iph.protocol, | |
543 | &iph.saddr, pptr[0], | |
544 | &iph.daddr, pptr[1], &p); | |
545 | cp = ip_vs_conn_new(&p, &daddr, 0, | |
546 | IP_VS_CONN_F_BYPASS | flags, | |
547 | NULL, skb->mark); | |
548 | if (!cp) | |
549 | return NF_DROP; | |
550 | } | |
551 | ||
552 | /* statistics */ | |
553 | ip_vs_in_stats(cp, skb); | |
554 | ||
555 | /* set state */ | |
556 | cs = ip_vs_set_state(cp, IP_VS_DIR_INPUT, skb, pd); | |
557 | ||
558 | /* transmit the first SYN packet */ | |
559 | ret = cp->packet_xmit(skb, cp, pd->pp); | |
560 | /* do not touch skb anymore */ | |
561 | ||
562 | atomic_inc(&cp->in_pkts); | |
563 | ip_vs_conn_put(cp); | |
564 | return ret; | |
565 | } | |
566 | ||
567 | /* | |
568 | * When the virtual ftp service is presented, packets destined | |
569 | * for other services on the VIP may get here (except services | |
570 | * listed in the ipvs table), pass the packets, because it is | |
571 | * not ipvs job to decide to drop the packets. | |
572 | */ | |
573 | if ((svc->port == FTPPORT) && (pptr[1] != FTPPORT)) { | |
574 | ip_vs_service_put(svc); | |
575 | return NF_ACCEPT; | |
576 | } | |
577 | ||
578 | ip_vs_service_put(svc); | |
579 | ||
580 | /* | |
581 | * Notify the client that the destination is unreachable, and | |
582 | * release the socket buffer. | |
583 | * Since it is in IP layer, the TCP socket is not actually | |
584 | * created, the TCP RST packet cannot be sent, instead that | |
585 | * ICMP_PORT_UNREACH is sent here no matter it is TCP/UDP. --WZ | |
586 | */ | |
587 | #ifdef CONFIG_IP_VS_IPV6 | |
588 | if (svc->af == AF_INET6) { | |
589 | if (!skb->dev) { | |
590 | struct net *net = dev_net(skb_dst(skb)->dev); | |
591 | ||
592 | skb->dev = net->loopback_dev; | |
593 | } | |
594 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); | |
595 | } else | |
596 | #endif | |
597 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); | |
598 | ||
599 | return NF_DROP; | |
600 | } | |
601 | ||
602 | __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset) | |
603 | { | |
604 | return csum_fold(skb_checksum(skb, offset, skb->len - offset, 0)); | |
605 | } | |
606 | ||
607 | static inline enum ip_defrag_users ip_vs_defrag_user(unsigned int hooknum) | |
608 | { | |
609 | if (NF_INET_LOCAL_IN == hooknum) | |
610 | return IP_DEFRAG_VS_IN; | |
611 | if (NF_INET_FORWARD == hooknum) | |
612 | return IP_DEFRAG_VS_FWD; | |
613 | return IP_DEFRAG_VS_OUT; | |
614 | } | |
615 | ||
616 | static inline int ip_vs_gather_frags(struct sk_buff *skb, u_int32_t user) | |
617 | { | |
618 | int err = ip_defrag(skb, user); | |
619 | ||
620 | if (!err) | |
621 | ip_send_check(ip_hdr(skb)); | |
622 | ||
623 | return err; | |
624 | } | |
625 | ||
626 | #ifdef CONFIG_IP_VS_IPV6 | |
627 | static inline int ip_vs_gather_frags_v6(struct sk_buff *skb, u_int32_t user) | |
628 | { | |
629 | /* TODO IPv6: Find out what to do here for IPv6 */ | |
630 | return 0; | |
631 | } | |
632 | #endif | |
633 | ||
634 | /* | |
635 | * Packet has been made sufficiently writable in caller | |
636 | * - inout: 1=in->out, 0=out->in | |
637 | */ | |
638 | void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp, | |
639 | struct ip_vs_conn *cp, int inout) | |
640 | { | |
641 | struct iphdr *iph = ip_hdr(skb); | |
642 | unsigned int icmp_offset = iph->ihl*4; | |
643 | struct icmphdr *icmph = (struct icmphdr *)(skb_network_header(skb) + | |
644 | icmp_offset); | |
645 | struct iphdr *ciph = (struct iphdr *)(icmph + 1); | |
646 | ||
647 | if (inout) { | |
648 | iph->saddr = cp->vaddr.ip; | |
649 | ip_send_check(iph); | |
650 | ciph->daddr = cp->vaddr.ip; | |
651 | ip_send_check(ciph); | |
652 | } else { | |
653 | iph->daddr = cp->daddr.ip; | |
654 | ip_send_check(iph); | |
655 | ciph->saddr = cp->daddr.ip; | |
656 | ip_send_check(ciph); | |
657 | } | |
658 | ||
659 | /* the TCP/UDP/SCTP port */ | |
660 | if (IPPROTO_TCP == ciph->protocol || IPPROTO_UDP == ciph->protocol || | |
661 | IPPROTO_SCTP == ciph->protocol) { | |
662 | __be16 *ports = (void *)ciph + ciph->ihl*4; | |
663 | ||
664 | if (inout) | |
665 | ports[1] = cp->vport; | |
666 | else | |
667 | ports[0] = cp->dport; | |
668 | } | |
669 | ||
670 | /* And finally the ICMP checksum */ | |
671 | icmph->checksum = 0; | |
672 | icmph->checksum = ip_vs_checksum_complete(skb, icmp_offset); | |
673 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
674 | ||
675 | if (inout) | |
676 | IP_VS_DBG_PKT(11, AF_INET, pp, skb, (void *)ciph - (void *)iph, | |
677 | "Forwarding altered outgoing ICMP"); | |
678 | else | |
679 | IP_VS_DBG_PKT(11, AF_INET, pp, skb, (void *)ciph - (void *)iph, | |
680 | "Forwarding altered incoming ICMP"); | |
681 | } | |
682 | ||
683 | #ifdef CONFIG_IP_VS_IPV6 | |
684 | void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp, | |
685 | struct ip_vs_conn *cp, int inout) | |
686 | { | |
687 | struct ipv6hdr *iph = ipv6_hdr(skb); | |
688 | unsigned int icmp_offset = sizeof(struct ipv6hdr); | |
689 | struct icmp6hdr *icmph = (struct icmp6hdr *)(skb_network_header(skb) + | |
690 | icmp_offset); | |
691 | struct ipv6hdr *ciph = (struct ipv6hdr *)(icmph + 1); | |
692 | ||
693 | if (inout) { | |
694 | iph->saddr = cp->vaddr.in6; | |
695 | ciph->daddr = cp->vaddr.in6; | |
696 | } else { | |
697 | iph->daddr = cp->daddr.in6; | |
698 | ciph->saddr = cp->daddr.in6; | |
699 | } | |
700 | ||
701 | /* the TCP/UDP/SCTP port */ | |
702 | if (IPPROTO_TCP == ciph->nexthdr || IPPROTO_UDP == ciph->nexthdr || | |
703 | IPPROTO_SCTP == ciph->nexthdr) { | |
704 | __be16 *ports = (void *)ciph + sizeof(struct ipv6hdr); | |
705 | ||
706 | if (inout) | |
707 | ports[1] = cp->vport; | |
708 | else | |
709 | ports[0] = cp->dport; | |
710 | } | |
711 | ||
712 | /* And finally the ICMP checksum */ | |
713 | icmph->icmp6_cksum = ~csum_ipv6_magic(&iph->saddr, &iph->daddr, | |
714 | skb->len - icmp_offset, | |
715 | IPPROTO_ICMPV6, 0); | |
716 | skb->csum_start = skb_network_header(skb) - skb->head + icmp_offset; | |
717 | skb->csum_offset = offsetof(struct icmp6hdr, icmp6_cksum); | |
718 | skb->ip_summed = CHECKSUM_PARTIAL; | |
719 | ||
720 | if (inout) | |
721 | IP_VS_DBG_PKT(11, AF_INET6, pp, skb, | |
722 | (void *)ciph - (void *)iph, | |
723 | "Forwarding altered outgoing ICMPv6"); | |
724 | else | |
725 | IP_VS_DBG_PKT(11, AF_INET6, pp, skb, | |
726 | (void *)ciph - (void *)iph, | |
727 | "Forwarding altered incoming ICMPv6"); | |
728 | } | |
729 | #endif | |
730 | ||
731 | /* Handle relevant response ICMP messages - forward to the right | |
732 | * destination host. Used for NAT and local client. | |
733 | */ | |
734 | static int handle_response_icmp(int af, struct sk_buff *skb, | |
735 | union nf_inet_addr *snet, | |
736 | __u8 protocol, struct ip_vs_conn *cp, | |
737 | struct ip_vs_protocol *pp, | |
738 | unsigned int offset, unsigned int ihl) | |
739 | { | |
740 | struct netns_ipvs *ipvs; | |
741 | unsigned int verdict = NF_DROP; | |
742 | ||
743 | if (IP_VS_FWD_METHOD(cp) != 0) { | |
744 | pr_err("shouldn't reach here, because the box is on the " | |
745 | "half connection in the tun/dr module.\n"); | |
746 | } | |
747 | ||
748 | /* Ensure the checksum is correct */ | |
749 | if (!skb_csum_unnecessary(skb) && ip_vs_checksum_complete(skb, ihl)) { | |
750 | /* Failed checksum! */ | |
751 | IP_VS_DBG_BUF(1, "Forward ICMP: failed checksum from %s!\n", | |
752 | IP_VS_DBG_ADDR(af, snet)); | |
753 | goto out; | |
754 | } | |
755 | ||
756 | if (IPPROTO_TCP == protocol || IPPROTO_UDP == protocol || | |
757 | IPPROTO_SCTP == protocol) | |
758 | offset += 2 * sizeof(__u16); | |
759 | if (!skb_make_writable(skb, offset)) | |
760 | goto out; | |
761 | ||
762 | ipvs = net_ipvs(skb_net(skb)); | |
763 | ||
764 | #ifdef CONFIG_IP_VS_IPV6 | |
765 | if (af == AF_INET6) | |
766 | ip_vs_nat_icmp_v6(skb, pp, cp, 1); | |
767 | else | |
768 | #endif | |
769 | ip_vs_nat_icmp(skb, pp, cp, 1); | |
770 | ||
771 | #ifdef CONFIG_IP_VS_IPV6 | |
772 | if (af == AF_INET6) { | |
773 | if (ipvs->sysctl_snat_reroute && ip6_route_me_harder(skb) != 0) | |
774 | goto out; | |
775 | } else | |
776 | #endif | |
777 | if ((ipvs->sysctl_snat_reroute || | |
778 | skb_rtable(skb)->rt_flags & RTCF_LOCAL) && | |
779 | ip_route_me_harder(skb, RTN_LOCAL) != 0) | |
780 | goto out; | |
781 | ||
782 | /* do the statistics and put it back */ | |
783 | ip_vs_out_stats(cp, skb); | |
784 | ||
785 | skb->ipvs_property = 1; | |
786 | if (!(cp->flags & IP_VS_CONN_F_NFCT)) | |
787 | ip_vs_notrack(skb); | |
788 | else | |
789 | ip_vs_update_conntrack(skb, cp, 0); | |
790 | verdict = NF_ACCEPT; | |
791 | ||
792 | out: | |
793 | __ip_vs_conn_put(cp); | |
794 | ||
795 | return verdict; | |
796 | } | |
797 | ||
798 | /* | |
799 | * Handle ICMP messages in the inside-to-outside direction (outgoing). | |
800 | * Find any that might be relevant, check against existing connections. | |
801 | * Currently handles error types - unreachable, quench, ttl exceeded. | |
802 | */ | |
803 | static int ip_vs_out_icmp(struct sk_buff *skb, int *related, | |
804 | unsigned int hooknum) | |
805 | { | |
806 | struct iphdr *iph; | |
807 | struct icmphdr _icmph, *ic; | |
808 | struct iphdr _ciph, *cih; /* The ip header contained within the ICMP */ | |
809 | struct ip_vs_iphdr ciph; | |
810 | struct ip_vs_conn *cp; | |
811 | struct ip_vs_protocol *pp; | |
812 | unsigned int offset, ihl; | |
813 | union nf_inet_addr snet; | |
814 | ||
815 | *related = 1; | |
816 | ||
817 | /* reassemble IP fragments */ | |
818 | if (ip_hdr(skb)->frag_off & htons(IP_MF | IP_OFFSET)) { | |
819 | if (ip_vs_gather_frags(skb, ip_vs_defrag_user(hooknum))) | |
820 | return NF_STOLEN; | |
821 | } | |
822 | ||
823 | iph = ip_hdr(skb); | |
824 | offset = ihl = iph->ihl * 4; | |
825 | ic = skb_header_pointer(skb, offset, sizeof(_icmph), &_icmph); | |
826 | if (ic == NULL) | |
827 | return NF_DROP; | |
828 | ||
829 | IP_VS_DBG(12, "Outgoing ICMP (%d,%d) %pI4->%pI4\n", | |
830 | ic->type, ntohs(icmp_id(ic)), | |
831 | &iph->saddr, &iph->daddr); | |
832 | ||
833 | /* | |
834 | * Work through seeing if this is for us. | |
835 | * These checks are supposed to be in an order that means easy | |
836 | * things are checked first to speed up processing.... however | |
837 | * this means that some packets will manage to get a long way | |
838 | * down this stack and then be rejected, but that's life. | |
839 | */ | |
840 | if ((ic->type != ICMP_DEST_UNREACH) && | |
841 | (ic->type != ICMP_SOURCE_QUENCH) && | |
842 | (ic->type != ICMP_TIME_EXCEEDED)) { | |
843 | *related = 0; | |
844 | return NF_ACCEPT; | |
845 | } | |
846 | ||
847 | /* Now find the contained IP header */ | |
848 | offset += sizeof(_icmph); | |
849 | cih = skb_header_pointer(skb, offset, sizeof(_ciph), &_ciph); | |
850 | if (cih == NULL) | |
851 | return NF_ACCEPT; /* The packet looks wrong, ignore */ | |
852 | ||
853 | pp = ip_vs_proto_get(cih->protocol); | |
854 | if (!pp) | |
855 | return NF_ACCEPT; | |
856 | ||
857 | /* Is the embedded protocol header present? */ | |
858 | if (unlikely(cih->frag_off & htons(IP_OFFSET) && | |
859 | pp->dont_defrag)) | |
860 | return NF_ACCEPT; | |
861 | ||
862 | IP_VS_DBG_PKT(11, AF_INET, pp, skb, offset, | |
863 | "Checking outgoing ICMP for"); | |
864 | ||
865 | offset += cih->ihl * 4; | |
866 | ||
867 | ip_vs_fill_iphdr(AF_INET, cih, &ciph); | |
868 | /* The embedded headers contain source and dest in reverse order */ | |
869 | cp = pp->conn_out_get(AF_INET, skb, &ciph, offset, 1); | |
870 | if (!cp) | |
871 | return NF_ACCEPT; | |
872 | ||
873 | snet.ip = iph->saddr; | |
874 | return handle_response_icmp(AF_INET, skb, &snet, cih->protocol, cp, | |
875 | pp, offset, ihl); | |
876 | } | |
877 | ||
878 | #ifdef CONFIG_IP_VS_IPV6 | |
879 | static int ip_vs_out_icmp_v6(struct sk_buff *skb, int *related, | |
880 | unsigned int hooknum) | |
881 | { | |
882 | struct ipv6hdr *iph; | |
883 | struct icmp6hdr _icmph, *ic; | |
884 | struct ipv6hdr _ciph, *cih; /* The ip header contained | |
885 | within the ICMP */ | |
886 | struct ip_vs_iphdr ciph; | |
887 | struct ip_vs_conn *cp; | |
888 | struct ip_vs_protocol *pp; | |
889 | unsigned int offset; | |
890 | union nf_inet_addr snet; | |
891 | ||
892 | *related = 1; | |
893 | ||
894 | /* reassemble IP fragments */ | |
895 | if (ipv6_hdr(skb)->nexthdr == IPPROTO_FRAGMENT) { | |
896 | if (ip_vs_gather_frags_v6(skb, ip_vs_defrag_user(hooknum))) | |
897 | return NF_STOLEN; | |
898 | } | |
899 | ||
900 | iph = ipv6_hdr(skb); | |
901 | offset = sizeof(struct ipv6hdr); | |
902 | ic = skb_header_pointer(skb, offset, sizeof(_icmph), &_icmph); | |
903 | if (ic == NULL) | |
904 | return NF_DROP; | |
905 | ||
906 | IP_VS_DBG(12, "Outgoing ICMPv6 (%d,%d) %pI6->%pI6\n", | |
907 | ic->icmp6_type, ntohs(icmpv6_id(ic)), | |
908 | &iph->saddr, &iph->daddr); | |
909 | ||
910 | /* | |
911 | * Work through seeing if this is for us. | |
912 | * These checks are supposed to be in an order that means easy | |
913 | * things are checked first to speed up processing.... however | |
914 | * this means that some packets will manage to get a long way | |
915 | * down this stack and then be rejected, but that's life. | |
916 | */ | |
917 | if ((ic->icmp6_type != ICMPV6_DEST_UNREACH) && | |
918 | (ic->icmp6_type != ICMPV6_PKT_TOOBIG) && | |
919 | (ic->icmp6_type != ICMPV6_TIME_EXCEED)) { | |
920 | *related = 0; | |
921 | return NF_ACCEPT; | |
922 | } | |
923 | ||
924 | /* Now find the contained IP header */ | |
925 | offset += sizeof(_icmph); | |
926 | cih = skb_header_pointer(skb, offset, sizeof(_ciph), &_ciph); | |
927 | if (cih == NULL) | |
928 | return NF_ACCEPT; /* The packet looks wrong, ignore */ | |
929 | ||
930 | pp = ip_vs_proto_get(cih->nexthdr); | |
931 | if (!pp) | |
932 | return NF_ACCEPT; | |
933 | ||
934 | /* Is the embedded protocol header present? */ | |
935 | /* TODO: we don't support fragmentation at the moment anyways */ | |
936 | if (unlikely(cih->nexthdr == IPPROTO_FRAGMENT && pp->dont_defrag)) | |
937 | return NF_ACCEPT; | |
938 | ||
939 | IP_VS_DBG_PKT(11, AF_INET6, pp, skb, offset, | |
940 | "Checking outgoing ICMPv6 for"); | |
941 | ||
942 | offset += sizeof(struct ipv6hdr); | |
943 | ||
944 | ip_vs_fill_iphdr(AF_INET6, cih, &ciph); | |
945 | /* The embedded headers contain source and dest in reverse order */ | |
946 | cp = pp->conn_out_get(AF_INET6, skb, &ciph, offset, 1); | |
947 | if (!cp) | |
948 | return NF_ACCEPT; | |
949 | ||
950 | ipv6_addr_copy(&snet.in6, &iph->saddr); | |
951 | return handle_response_icmp(AF_INET6, skb, &snet, cih->nexthdr, cp, | |
952 | pp, offset, sizeof(struct ipv6hdr)); | |
953 | } | |
954 | #endif | |
955 | ||
956 | /* | |
957 | * Check if sctp chunc is ABORT chunk | |
958 | */ | |
959 | static inline int is_sctp_abort(const struct sk_buff *skb, int nh_len) | |
960 | { | |
961 | sctp_chunkhdr_t *sch, schunk; | |
962 | sch = skb_header_pointer(skb, nh_len + sizeof(sctp_sctphdr_t), | |
963 | sizeof(schunk), &schunk); | |
964 | if (sch == NULL) | |
965 | return 0; | |
966 | if (sch->type == SCTP_CID_ABORT) | |
967 | return 1; | |
968 | return 0; | |
969 | } | |
970 | ||
971 | static inline int is_tcp_reset(const struct sk_buff *skb, int nh_len) | |
972 | { | |
973 | struct tcphdr _tcph, *th; | |
974 | ||
975 | th = skb_header_pointer(skb, nh_len, sizeof(_tcph), &_tcph); | |
976 | if (th == NULL) | |
977 | return 0; | |
978 | return th->rst; | |
979 | } | |
980 | ||
981 | /* Handle response packets: rewrite addresses and send away... | |
982 | * Used for NAT and local client. | |
983 | */ | |
984 | static unsigned int | |
985 | handle_response(int af, struct sk_buff *skb, struct ip_vs_proto_data *pd, | |
986 | struct ip_vs_conn *cp, int ihl) | |
987 | { | |
988 | struct ip_vs_protocol *pp = pd->pp; | |
989 | struct netns_ipvs *ipvs; | |
990 | ||
991 | IP_VS_DBG_PKT(11, af, pp, skb, 0, "Outgoing packet"); | |
992 | ||
993 | if (!skb_make_writable(skb, ihl)) | |
994 | goto drop; | |
995 | ||
996 | /* mangle the packet */ | |
997 | if (pp->snat_handler && !pp->snat_handler(skb, pp, cp)) | |
998 | goto drop; | |
999 | ||
1000 | #ifdef CONFIG_IP_VS_IPV6 | |
1001 | if (af == AF_INET6) | |
1002 | ipv6_hdr(skb)->saddr = cp->vaddr.in6; | |
1003 | else | |
1004 | #endif | |
1005 | { | |
1006 | ip_hdr(skb)->saddr = cp->vaddr.ip; | |
1007 | ip_send_check(ip_hdr(skb)); | |
1008 | } | |
1009 | ||
1010 | /* | |
1011 | * nf_iterate does not expect change in the skb->dst->dev. | |
1012 | * It looks like it is not fatal to enable this code for hooks | |
1013 | * where our handlers are at the end of the chain list and | |
1014 | * when all next handlers use skb->dst->dev and not outdev. | |
1015 | * It will definitely route properly the inout NAT traffic | |
1016 | * when multiple paths are used. | |
1017 | */ | |
1018 | ||
1019 | /* For policy routing, packets originating from this | |
1020 | * machine itself may be routed differently to packets | |
1021 | * passing through. We want this packet to be routed as | |
1022 | * if it came from this machine itself. So re-compute | |
1023 | * the routing information. | |
1024 | */ | |
1025 | ipvs = net_ipvs(skb_net(skb)); | |
1026 | ||
1027 | #ifdef CONFIG_IP_VS_IPV6 | |
1028 | if (af == AF_INET6) { | |
1029 | if (ipvs->sysctl_snat_reroute && ip6_route_me_harder(skb) != 0) | |
1030 | goto drop; | |
1031 | } else | |
1032 | #endif | |
1033 | if ((ipvs->sysctl_snat_reroute || | |
1034 | skb_rtable(skb)->rt_flags & RTCF_LOCAL) && | |
1035 | ip_route_me_harder(skb, RTN_LOCAL) != 0) | |
1036 | goto drop; | |
1037 | ||
1038 | IP_VS_DBG_PKT(10, af, pp, skb, 0, "After SNAT"); | |
1039 | ||
1040 | ip_vs_out_stats(cp, skb); | |
1041 | ip_vs_set_state(cp, IP_VS_DIR_OUTPUT, skb, pd); | |
1042 | skb->ipvs_property = 1; | |
1043 | if (!(cp->flags & IP_VS_CONN_F_NFCT)) | |
1044 | ip_vs_notrack(skb); | |
1045 | else | |
1046 | ip_vs_update_conntrack(skb, cp, 0); | |
1047 | ip_vs_conn_put(cp); | |
1048 | ||
1049 | LeaveFunction(11); | |
1050 | return NF_ACCEPT; | |
1051 | ||
1052 | drop: | |
1053 | ip_vs_conn_put(cp); | |
1054 | kfree_skb(skb); | |
1055 | LeaveFunction(11); | |
1056 | return NF_STOLEN; | |
1057 | } | |
1058 | ||
1059 | /* | |
1060 | * Check if outgoing packet belongs to the established ip_vs_conn. | |
1061 | */ | |
1062 | static unsigned int | |
1063 | ip_vs_out(unsigned int hooknum, struct sk_buff *skb, int af) | |
1064 | { | |
1065 | struct net *net = NULL; | |
1066 | struct ip_vs_iphdr iph; | |
1067 | struct ip_vs_protocol *pp; | |
1068 | struct ip_vs_proto_data *pd; | |
1069 | struct ip_vs_conn *cp; | |
1070 | struct netns_ipvs *ipvs; | |
1071 | ||
1072 | EnterFunction(11); | |
1073 | ||
1074 | /* Already marked as IPVS request or reply? */ | |
1075 | if (skb->ipvs_property) | |
1076 | return NF_ACCEPT; | |
1077 | ||
1078 | /* Bad... Do not break raw sockets */ | |
1079 | if (unlikely(skb->sk != NULL && hooknum == NF_INET_LOCAL_OUT && | |
1080 | af == AF_INET)) { | |
1081 | struct sock *sk = skb->sk; | |
1082 | struct inet_sock *inet = inet_sk(skb->sk); | |
1083 | ||
1084 | if (inet && sk->sk_family == PF_INET && inet->nodefrag) | |
1085 | return NF_ACCEPT; | |
1086 | } | |
1087 | ||
1088 | if (unlikely(!skb_dst(skb))) | |
1089 | return NF_ACCEPT; | |
1090 | ||
1091 | net = skb_net(skb); | |
1092 | ip_vs_fill_iphdr(af, skb_network_header(skb), &iph); | |
1093 | #ifdef CONFIG_IP_VS_IPV6 | |
1094 | if (af == AF_INET6) { | |
1095 | if (unlikely(iph.protocol == IPPROTO_ICMPV6)) { | |
1096 | int related; | |
1097 | int verdict = ip_vs_out_icmp_v6(skb, &related, | |
1098 | hooknum); | |
1099 | ||
1100 | if (related) | |
1101 | return verdict; | |
1102 | ip_vs_fill_iphdr(af, skb_network_header(skb), &iph); | |
1103 | } | |
1104 | } else | |
1105 | #endif | |
1106 | if (unlikely(iph.protocol == IPPROTO_ICMP)) { | |
1107 | int related; | |
1108 | int verdict = ip_vs_out_icmp(skb, &related, hooknum); | |
1109 | ||
1110 | if (related) | |
1111 | return verdict; | |
1112 | ip_vs_fill_iphdr(af, skb_network_header(skb), &iph); | |
1113 | } | |
1114 | ||
1115 | pd = ip_vs_proto_data_get(net, iph.protocol); | |
1116 | if (unlikely(!pd)) | |
1117 | return NF_ACCEPT; | |
1118 | pp = pd->pp; | |
1119 | ||
1120 | /* reassemble IP fragments */ | |
1121 | #ifdef CONFIG_IP_VS_IPV6 | |
1122 | if (af == AF_INET6) { | |
1123 | if (ipv6_hdr(skb)->nexthdr == IPPROTO_FRAGMENT) { | |
1124 | if (ip_vs_gather_frags_v6(skb, | |
1125 | ip_vs_defrag_user(hooknum))) | |
1126 | return NF_STOLEN; | |
1127 | } | |
1128 | ||
1129 | ip_vs_fill_iphdr(af, skb_network_header(skb), &iph); | |
1130 | } else | |
1131 | #endif | |
1132 | if (unlikely(ip_hdr(skb)->frag_off & htons(IP_MF|IP_OFFSET) && | |
1133 | !pp->dont_defrag)) { | |
1134 | if (ip_vs_gather_frags(skb, | |
1135 | ip_vs_defrag_user(hooknum))) | |
1136 | return NF_STOLEN; | |
1137 | ||
1138 | ip_vs_fill_iphdr(af, skb_network_header(skb), &iph); | |
1139 | } | |
1140 | ||
1141 | /* | |
1142 | * Check if the packet belongs to an existing entry | |
1143 | */ | |
1144 | cp = pp->conn_out_get(af, skb, &iph, iph.len, 0); | |
1145 | ipvs = net_ipvs(net); | |
1146 | ||
1147 | if (likely(cp)) | |
1148 | return handle_response(af, skb, pd, cp, iph.len); | |
1149 | if (ipvs->sysctl_nat_icmp_send && | |
1150 | (pp->protocol == IPPROTO_TCP || | |
1151 | pp->protocol == IPPROTO_UDP || | |
1152 | pp->protocol == IPPROTO_SCTP)) { | |
1153 | __be16 _ports[2], *pptr; | |
1154 | ||
1155 | pptr = skb_header_pointer(skb, iph.len, | |
1156 | sizeof(_ports), _ports); | |
1157 | if (pptr == NULL) | |
1158 | return NF_ACCEPT; /* Not for me */ | |
1159 | if (ip_vs_lookup_real_service(net, af, iph.protocol, | |
1160 | &iph.saddr, | |
1161 | pptr[0])) { | |
1162 | /* | |
1163 | * Notify the real server: there is no | |
1164 | * existing entry if it is not RST | |
1165 | * packet or not TCP packet. | |
1166 | */ | |
1167 | if ((iph.protocol != IPPROTO_TCP && | |
1168 | iph.protocol != IPPROTO_SCTP) | |
1169 | || ((iph.protocol == IPPROTO_TCP | |
1170 | && !is_tcp_reset(skb, iph.len)) | |
1171 | || (iph.protocol == IPPROTO_SCTP | |
1172 | && !is_sctp_abort(skb, | |
1173 | iph.len)))) { | |
1174 | #ifdef CONFIG_IP_VS_IPV6 | |
1175 | if (af == AF_INET6) { | |
1176 | struct net *net = | |
1177 | dev_net(skb_dst(skb)->dev); | |
1178 | ||
1179 | if (!skb->dev) | |
1180 | skb->dev = net->loopback_dev; | |
1181 | icmpv6_send(skb, | |
1182 | ICMPV6_DEST_UNREACH, | |
1183 | ICMPV6_PORT_UNREACH, | |
1184 | 0); | |
1185 | } else | |
1186 | #endif | |
1187 | icmp_send(skb, | |
1188 | ICMP_DEST_UNREACH, | |
1189 | ICMP_PORT_UNREACH, 0); | |
1190 | return NF_DROP; | |
1191 | } | |
1192 | } | |
1193 | } | |
1194 | IP_VS_DBG_PKT(12, af, pp, skb, 0, | |
1195 | "ip_vs_out: packet continues traversal as normal"); | |
1196 | return NF_ACCEPT; | |
1197 | } | |
1198 | ||
1199 | /* | |
1200 | * It is hooked at the NF_INET_FORWARD and NF_INET_LOCAL_IN chain, | |
1201 | * used only for VS/NAT. | |
1202 | * Check if packet is reply for established ip_vs_conn. | |
1203 | */ | |
1204 | static unsigned int | |
1205 | ip_vs_reply4(unsigned int hooknum, struct sk_buff *skb, | |
1206 | const struct net_device *in, const struct net_device *out, | |
1207 | int (*okfn)(struct sk_buff *)) | |
1208 | { | |
1209 | return ip_vs_out(hooknum, skb, AF_INET); | |
1210 | } | |
1211 | ||
1212 | /* | |
1213 | * It is hooked at the NF_INET_LOCAL_OUT chain, used only for VS/NAT. | |
1214 | * Check if packet is reply for established ip_vs_conn. | |
1215 | */ | |
1216 | static unsigned int | |
1217 | ip_vs_local_reply4(unsigned int hooknum, struct sk_buff *skb, | |
1218 | const struct net_device *in, const struct net_device *out, | |
1219 | int (*okfn)(struct sk_buff *)) | |
1220 | { | |
1221 | unsigned int verdict; | |
1222 | ||
1223 | /* Disable BH in LOCAL_OUT until all places are fixed */ | |
1224 | local_bh_disable(); | |
1225 | verdict = ip_vs_out(hooknum, skb, AF_INET); | |
1226 | local_bh_enable(); | |
1227 | return verdict; | |
1228 | } | |
1229 | ||
1230 | #ifdef CONFIG_IP_VS_IPV6 | |
1231 | ||
1232 | /* | |
1233 | * It is hooked at the NF_INET_FORWARD and NF_INET_LOCAL_IN chain, | |
1234 | * used only for VS/NAT. | |
1235 | * Check if packet is reply for established ip_vs_conn. | |
1236 | */ | |
1237 | static unsigned int | |
1238 | ip_vs_reply6(unsigned int hooknum, struct sk_buff *skb, | |
1239 | const struct net_device *in, const struct net_device *out, | |
1240 | int (*okfn)(struct sk_buff *)) | |
1241 | { | |
1242 | return ip_vs_out(hooknum, skb, AF_INET6); | |
1243 | } | |
1244 | ||
1245 | /* | |
1246 | * It is hooked at the NF_INET_LOCAL_OUT chain, used only for VS/NAT. | |
1247 | * Check if packet is reply for established ip_vs_conn. | |
1248 | */ | |
1249 | static unsigned int | |
1250 | ip_vs_local_reply6(unsigned int hooknum, struct sk_buff *skb, | |
1251 | const struct net_device *in, const struct net_device *out, | |
1252 | int (*okfn)(struct sk_buff *)) | |
1253 | { | |
1254 | unsigned int verdict; | |
1255 | ||
1256 | /* Disable BH in LOCAL_OUT until all places are fixed */ | |
1257 | local_bh_disable(); | |
1258 | verdict = ip_vs_out(hooknum, skb, AF_INET6); | |
1259 | local_bh_enable(); | |
1260 | return verdict; | |
1261 | } | |
1262 | ||
1263 | #endif | |
1264 | ||
1265 | /* | |
1266 | * Handle ICMP messages in the outside-to-inside direction (incoming). | |
1267 | * Find any that might be relevant, check against existing connections, | |
1268 | * forward to the right destination host if relevant. | |
1269 | * Currently handles error types - unreachable, quench, ttl exceeded. | |
1270 | */ | |
1271 | static int | |
1272 | ip_vs_in_icmp(struct sk_buff *skb, int *related, unsigned int hooknum) | |
1273 | { | |
1274 | struct net *net = NULL; | |
1275 | struct iphdr *iph; | |
1276 | struct icmphdr _icmph, *ic; | |
1277 | struct iphdr _ciph, *cih; /* The ip header contained within the ICMP */ | |
1278 | struct ip_vs_iphdr ciph; | |
1279 | struct ip_vs_conn *cp; | |
1280 | struct ip_vs_protocol *pp; | |
1281 | struct ip_vs_proto_data *pd; | |
1282 | unsigned int offset, ihl, verdict; | |
1283 | union nf_inet_addr snet; | |
1284 | ||
1285 | *related = 1; | |
1286 | ||
1287 | /* reassemble IP fragments */ | |
1288 | if (ip_hdr(skb)->frag_off & htons(IP_MF | IP_OFFSET)) { | |
1289 | if (ip_vs_gather_frags(skb, ip_vs_defrag_user(hooknum))) | |
1290 | return NF_STOLEN; | |
1291 | } | |
1292 | ||
1293 | iph = ip_hdr(skb); | |
1294 | offset = ihl = iph->ihl * 4; | |
1295 | ic = skb_header_pointer(skb, offset, sizeof(_icmph), &_icmph); | |
1296 | if (ic == NULL) | |
1297 | return NF_DROP; | |
1298 | ||
1299 | IP_VS_DBG(12, "Incoming ICMP (%d,%d) %pI4->%pI4\n", | |
1300 | ic->type, ntohs(icmp_id(ic)), | |
1301 | &iph->saddr, &iph->daddr); | |
1302 | ||
1303 | /* | |
1304 | * Work through seeing if this is for us. | |
1305 | * These checks are supposed to be in an order that means easy | |
1306 | * things are checked first to speed up processing.... however | |
1307 | * this means that some packets will manage to get a long way | |
1308 | * down this stack and then be rejected, but that's life. | |
1309 | */ | |
1310 | if ((ic->type != ICMP_DEST_UNREACH) && | |
1311 | (ic->type != ICMP_SOURCE_QUENCH) && | |
1312 | (ic->type != ICMP_TIME_EXCEEDED)) { | |
1313 | *related = 0; | |
1314 | return NF_ACCEPT; | |
1315 | } | |
1316 | ||
1317 | /* Now find the contained IP header */ | |
1318 | offset += sizeof(_icmph); | |
1319 | cih = skb_header_pointer(skb, offset, sizeof(_ciph), &_ciph); | |
1320 | if (cih == NULL) | |
1321 | return NF_ACCEPT; /* The packet looks wrong, ignore */ | |
1322 | ||
1323 | net = skb_net(skb); | |
1324 | pd = ip_vs_proto_data_get(net, cih->protocol); | |
1325 | if (!pd) | |
1326 | return NF_ACCEPT; | |
1327 | pp = pd->pp; | |
1328 | ||
1329 | /* Is the embedded protocol header present? */ | |
1330 | if (unlikely(cih->frag_off & htons(IP_OFFSET) && | |
1331 | pp->dont_defrag)) | |
1332 | return NF_ACCEPT; | |
1333 | ||
1334 | IP_VS_DBG_PKT(11, AF_INET, pp, skb, offset, | |
1335 | "Checking incoming ICMP for"); | |
1336 | ||
1337 | offset += cih->ihl * 4; | |
1338 | ||
1339 | ip_vs_fill_iphdr(AF_INET, cih, &ciph); | |
1340 | /* The embedded headers contain source and dest in reverse order */ | |
1341 | cp = pp->conn_in_get(AF_INET, skb, &ciph, offset, 1); | |
1342 | if (!cp) { | |
1343 | /* The packet could also belong to a local client */ | |
1344 | cp = pp->conn_out_get(AF_INET, skb, &ciph, offset, 1); | |
1345 | if (cp) { | |
1346 | snet.ip = iph->saddr; | |
1347 | return handle_response_icmp(AF_INET, skb, &snet, | |
1348 | cih->protocol, cp, pp, | |
1349 | offset, ihl); | |
1350 | } | |
1351 | return NF_ACCEPT; | |
1352 | } | |
1353 | ||
1354 | verdict = NF_DROP; | |
1355 | ||
1356 | /* Ensure the checksum is correct */ | |
1357 | if (!skb_csum_unnecessary(skb) && ip_vs_checksum_complete(skb, ihl)) { | |
1358 | /* Failed checksum! */ | |
1359 | IP_VS_DBG(1, "Incoming ICMP: failed checksum from %pI4!\n", | |
1360 | &iph->saddr); | |
1361 | goto out; | |
1362 | } | |
1363 | ||
1364 | /* do the statistics and put it back */ | |
1365 | ip_vs_in_stats(cp, skb); | |
1366 | if (IPPROTO_TCP == cih->protocol || IPPROTO_UDP == cih->protocol) | |
1367 | offset += 2 * sizeof(__u16); | |
1368 | verdict = ip_vs_icmp_xmit(skb, cp, pp, offset); | |
1369 | /* LOCALNODE from FORWARD hook is not supported */ | |
1370 | if (verdict == NF_ACCEPT && hooknum == NF_INET_FORWARD && | |
1371 | skb_rtable(skb)->rt_flags & RTCF_LOCAL) { | |
1372 | IP_VS_DBG(1, "%s(): " | |
1373 | "local delivery to %pI4 but in FORWARD\n", | |
1374 | __func__, &skb_rtable(skb)->rt_dst); | |
1375 | verdict = NF_DROP; | |
1376 | } | |
1377 | ||
1378 | out: | |
1379 | __ip_vs_conn_put(cp); | |
1380 | ||
1381 | return verdict; | |
1382 | } | |
1383 | ||
1384 | #ifdef CONFIG_IP_VS_IPV6 | |
1385 | static int | |
1386 | ip_vs_in_icmp_v6(struct sk_buff *skb, int *related, unsigned int hooknum) | |
1387 | { | |
1388 | struct net *net = NULL; | |
1389 | struct ipv6hdr *iph; | |
1390 | struct icmp6hdr _icmph, *ic; | |
1391 | struct ipv6hdr _ciph, *cih; /* The ip header contained | |
1392 | within the ICMP */ | |
1393 | struct ip_vs_iphdr ciph; | |
1394 | struct ip_vs_conn *cp; | |
1395 | struct ip_vs_protocol *pp; | |
1396 | struct ip_vs_proto_data *pd; | |
1397 | unsigned int offset, verdict; | |
1398 | union nf_inet_addr snet; | |
1399 | struct rt6_info *rt; | |
1400 | ||
1401 | *related = 1; | |
1402 | ||
1403 | /* reassemble IP fragments */ | |
1404 | if (ipv6_hdr(skb)->nexthdr == IPPROTO_FRAGMENT) { | |
1405 | if (ip_vs_gather_frags_v6(skb, ip_vs_defrag_user(hooknum))) | |
1406 | return NF_STOLEN; | |
1407 | } | |
1408 | ||
1409 | iph = ipv6_hdr(skb); | |
1410 | offset = sizeof(struct ipv6hdr); | |
1411 | ic = skb_header_pointer(skb, offset, sizeof(_icmph), &_icmph); | |
1412 | if (ic == NULL) | |
1413 | return NF_DROP; | |
1414 | ||
1415 | IP_VS_DBG(12, "Incoming ICMPv6 (%d,%d) %pI6->%pI6\n", | |
1416 | ic->icmp6_type, ntohs(icmpv6_id(ic)), | |
1417 | &iph->saddr, &iph->daddr); | |
1418 | ||
1419 | /* | |
1420 | * Work through seeing if this is for us. | |
1421 | * These checks are supposed to be in an order that means easy | |
1422 | * things are checked first to speed up processing.... however | |
1423 | * this means that some packets will manage to get a long way | |
1424 | * down this stack and then be rejected, but that's life. | |
1425 | */ | |
1426 | if ((ic->icmp6_type != ICMPV6_DEST_UNREACH) && | |
1427 | (ic->icmp6_type != ICMPV6_PKT_TOOBIG) && | |
1428 | (ic->icmp6_type != ICMPV6_TIME_EXCEED)) { | |
1429 | *related = 0; | |
1430 | return NF_ACCEPT; | |
1431 | } | |
1432 | ||
1433 | /* Now find the contained IP header */ | |
1434 | offset += sizeof(_icmph); | |
1435 | cih = skb_header_pointer(skb, offset, sizeof(_ciph), &_ciph); | |
1436 | if (cih == NULL) | |
1437 | return NF_ACCEPT; /* The packet looks wrong, ignore */ | |
1438 | ||
1439 | net = skb_net(skb); | |
1440 | pd = ip_vs_proto_data_get(net, cih->nexthdr); | |
1441 | if (!pd) | |
1442 | return NF_ACCEPT; | |
1443 | pp = pd->pp; | |
1444 | ||
1445 | /* Is the embedded protocol header present? */ | |
1446 | /* TODO: we don't support fragmentation at the moment anyways */ | |
1447 | if (unlikely(cih->nexthdr == IPPROTO_FRAGMENT && pp->dont_defrag)) | |
1448 | return NF_ACCEPT; | |
1449 | ||
1450 | IP_VS_DBG_PKT(11, AF_INET6, pp, skb, offset, | |
1451 | "Checking incoming ICMPv6 for"); | |
1452 | ||
1453 | offset += sizeof(struct ipv6hdr); | |
1454 | ||
1455 | ip_vs_fill_iphdr(AF_INET6, cih, &ciph); | |
1456 | /* The embedded headers contain source and dest in reverse order */ | |
1457 | cp = pp->conn_in_get(AF_INET6, skb, &ciph, offset, 1); | |
1458 | if (!cp) { | |
1459 | /* The packet could also belong to a local client */ | |
1460 | cp = pp->conn_out_get(AF_INET6, skb, &ciph, offset, 1); | |
1461 | if (cp) { | |
1462 | ipv6_addr_copy(&snet.in6, &iph->saddr); | |
1463 | return handle_response_icmp(AF_INET6, skb, &snet, | |
1464 | cih->nexthdr, | |
1465 | cp, pp, offset, | |
1466 | sizeof(struct ipv6hdr)); | |
1467 | } | |
1468 | return NF_ACCEPT; | |
1469 | } | |
1470 | ||
1471 | verdict = NF_DROP; | |
1472 | ||
1473 | /* do the statistics and put it back */ | |
1474 | ip_vs_in_stats(cp, skb); | |
1475 | if (IPPROTO_TCP == cih->nexthdr || IPPROTO_UDP == cih->nexthdr || | |
1476 | IPPROTO_SCTP == cih->nexthdr) | |
1477 | offset += 2 * sizeof(__u16); | |
1478 | verdict = ip_vs_icmp_xmit_v6(skb, cp, pp, offset); | |
1479 | /* LOCALNODE from FORWARD hook is not supported */ | |
1480 | if (verdict == NF_ACCEPT && hooknum == NF_INET_FORWARD && | |
1481 | (rt = (struct rt6_info *) skb_dst(skb)) && | |
1482 | rt->rt6i_dev && rt->rt6i_dev->flags & IFF_LOOPBACK) { | |
1483 | IP_VS_DBG(1, "%s(): " | |
1484 | "local delivery to %pI6 but in FORWARD\n", | |
1485 | __func__, &rt->rt6i_dst); | |
1486 | verdict = NF_DROP; | |
1487 | } | |
1488 | ||
1489 | __ip_vs_conn_put(cp); | |
1490 | ||
1491 | return verdict; | |
1492 | } | |
1493 | #endif | |
1494 | ||
1495 | ||
1496 | /* | |
1497 | * Check if it's for virtual services, look it up, | |
1498 | * and send it on its way... | |
1499 | */ | |
1500 | static unsigned int | |
1501 | ip_vs_in(unsigned int hooknum, struct sk_buff *skb, int af) | |
1502 | { | |
1503 | struct net *net; | |
1504 | struct ip_vs_iphdr iph; | |
1505 | struct ip_vs_protocol *pp; | |
1506 | struct ip_vs_proto_data *pd; | |
1507 | struct ip_vs_conn *cp; | |
1508 | int ret, restart, pkts; | |
1509 | struct netns_ipvs *ipvs; | |
1510 | ||
1511 | /* Already marked as IPVS request or reply? */ | |
1512 | if (skb->ipvs_property) | |
1513 | return NF_ACCEPT; | |
1514 | ||
1515 | /* | |
1516 | * Big tappo: | |
1517 | * - remote client: only PACKET_HOST | |
1518 | * - route: used for struct net when skb->dev is unset | |
1519 | */ | |
1520 | if (unlikely((skb->pkt_type != PACKET_HOST && | |
1521 | hooknum != NF_INET_LOCAL_OUT) || | |
1522 | !skb_dst(skb))) { | |
1523 | ip_vs_fill_iphdr(af, skb_network_header(skb), &iph); | |
1524 | IP_VS_DBG_BUF(12, "packet type=%d proto=%d daddr=%s" | |
1525 | " ignored in hook %u\n", | |
1526 | skb->pkt_type, iph.protocol, | |
1527 | IP_VS_DBG_ADDR(af, &iph.daddr), hooknum); | |
1528 | return NF_ACCEPT; | |
1529 | } | |
1530 | ip_vs_fill_iphdr(af, skb_network_header(skb), &iph); | |
1531 | ||
1532 | /* Bad... Do not break raw sockets */ | |
1533 | if (unlikely(skb->sk != NULL && hooknum == NF_INET_LOCAL_OUT && | |
1534 | af == AF_INET)) { | |
1535 | struct sock *sk = skb->sk; | |
1536 | struct inet_sock *inet = inet_sk(skb->sk); | |
1537 | ||
1538 | if (inet && sk->sk_family == PF_INET && inet->nodefrag) | |
1539 | return NF_ACCEPT; | |
1540 | } | |
1541 | ||
1542 | #ifdef CONFIG_IP_VS_IPV6 | |
1543 | if (af == AF_INET6) { | |
1544 | if (unlikely(iph.protocol == IPPROTO_ICMPV6)) { | |
1545 | int related; | |
1546 | int verdict = ip_vs_in_icmp_v6(skb, &related, hooknum); | |
1547 | ||
1548 | if (related) | |
1549 | return verdict; | |
1550 | ip_vs_fill_iphdr(af, skb_network_header(skb), &iph); | |
1551 | } | |
1552 | } else | |
1553 | #endif | |
1554 | if (unlikely(iph.protocol == IPPROTO_ICMP)) { | |
1555 | int related; | |
1556 | int verdict = ip_vs_in_icmp(skb, &related, hooknum); | |
1557 | ||
1558 | if (related) | |
1559 | return verdict; | |
1560 | ip_vs_fill_iphdr(af, skb_network_header(skb), &iph); | |
1561 | } | |
1562 | ||
1563 | net = skb_net(skb); | |
1564 | /* Protocol supported? */ | |
1565 | pd = ip_vs_proto_data_get(net, iph.protocol); | |
1566 | if (unlikely(!pd)) | |
1567 | return NF_ACCEPT; | |
1568 | pp = pd->pp; | |
1569 | /* | |
1570 | * Check if the packet belongs to an existing connection entry | |
1571 | */ | |
1572 | cp = pp->conn_in_get(af, skb, &iph, iph.len, 0); | |
1573 | ||
1574 | if (unlikely(!cp)) { | |
1575 | int v; | |
1576 | ||
1577 | if (!pp->conn_schedule(af, skb, pd, &v, &cp)) | |
1578 | return v; | |
1579 | } | |
1580 | ||
1581 | if (unlikely(!cp)) { | |
1582 | /* sorry, all this trouble for a no-hit :) */ | |
1583 | IP_VS_DBG_PKT(12, af, pp, skb, 0, | |
1584 | "ip_vs_in: packet continues traversal as normal"); | |
1585 | return NF_ACCEPT; | |
1586 | } | |
1587 | ||
1588 | IP_VS_DBG_PKT(11, af, pp, skb, 0, "Incoming packet"); | |
1589 | net = skb_net(skb); | |
1590 | ipvs = net_ipvs(net); | |
1591 | /* Check the server status */ | |
1592 | if (cp->dest && !(cp->dest->flags & IP_VS_DEST_F_AVAILABLE)) { | |
1593 | /* the destination server is not available */ | |
1594 | ||
1595 | if (ipvs->sysctl_expire_nodest_conn) { | |
1596 | /* try to expire the connection immediately */ | |
1597 | ip_vs_conn_expire_now(cp); | |
1598 | } | |
1599 | /* don't restart its timer, and silently | |
1600 | drop the packet. */ | |
1601 | __ip_vs_conn_put(cp); | |
1602 | return NF_DROP; | |
1603 | } | |
1604 | ||
1605 | ip_vs_in_stats(cp, skb); | |
1606 | restart = ip_vs_set_state(cp, IP_VS_DIR_INPUT, skb, pd); | |
1607 | if (cp->packet_xmit) | |
1608 | ret = cp->packet_xmit(skb, cp, pp); | |
1609 | /* do not touch skb anymore */ | |
1610 | else { | |
1611 | IP_VS_DBG_RL("warning: packet_xmit is null"); | |
1612 | ret = NF_ACCEPT; | |
1613 | } | |
1614 | ||
1615 | /* Increase its packet counter and check if it is needed | |
1616 | * to be synchronized | |
1617 | * | |
1618 | * Sync connection if it is about to close to | |
1619 | * encorage the standby servers to update the connections timeout | |
1620 | * | |
1621 | * For ONE_PKT let ip_vs_sync_conn() do the filter work. | |
1622 | */ | |
1623 | ||
1624 | if (cp->flags & IP_VS_CONN_F_ONE_PACKET) | |
1625 | pkts = ipvs->sysctl_sync_threshold[0]; | |
1626 | else | |
1627 | pkts = atomic_add_return(1, &cp->in_pkts); | |
1628 | ||
1629 | if ((ipvs->sync_state & IP_VS_STATE_MASTER) && | |
1630 | cp->protocol == IPPROTO_SCTP) { | |
1631 | if ((cp->state == IP_VS_SCTP_S_ESTABLISHED && | |
1632 | (pkts % ipvs->sysctl_sync_threshold[1] | |
1633 | == ipvs->sysctl_sync_threshold[0])) || | |
1634 | (cp->old_state != cp->state && | |
1635 | ((cp->state == IP_VS_SCTP_S_CLOSED) || | |
1636 | (cp->state == IP_VS_SCTP_S_SHUT_ACK_CLI) || | |
1637 | (cp->state == IP_VS_SCTP_S_SHUT_ACK_SER)))) { | |
1638 | ip_vs_sync_conn(net, cp); | |
1639 | goto out; | |
1640 | } | |
1641 | } | |
1642 | ||
1643 | /* Keep this block last: TCP and others with pp->num_states <= 1 */ | |
1644 | else if ((ipvs->sync_state & IP_VS_STATE_MASTER) && | |
1645 | (((cp->protocol != IPPROTO_TCP || | |
1646 | cp->state == IP_VS_TCP_S_ESTABLISHED) && | |
1647 | (pkts % ipvs->sysctl_sync_threshold[1] | |
1648 | == ipvs->sysctl_sync_threshold[0])) || | |
1649 | ((cp->protocol == IPPROTO_TCP) && (cp->old_state != cp->state) && | |
1650 | ((cp->state == IP_VS_TCP_S_FIN_WAIT) || | |
1651 | (cp->state == IP_VS_TCP_S_CLOSE) || | |
1652 | (cp->state == IP_VS_TCP_S_CLOSE_WAIT) || | |
1653 | (cp->state == IP_VS_TCP_S_TIME_WAIT))))) | |
1654 | ip_vs_sync_conn(net, cp); | |
1655 | out: | |
1656 | cp->old_state = cp->state; | |
1657 | ||
1658 | ip_vs_conn_put(cp); | |
1659 | return ret; | |
1660 | } | |
1661 | ||
1662 | /* | |
1663 | * AF_INET handler in NF_INET_LOCAL_IN chain | |
1664 | * Schedule and forward packets from remote clients | |
1665 | */ | |
1666 | static unsigned int | |
1667 | ip_vs_remote_request4(unsigned int hooknum, struct sk_buff *skb, | |
1668 | const struct net_device *in, | |
1669 | const struct net_device *out, | |
1670 | int (*okfn)(struct sk_buff *)) | |
1671 | { | |
1672 | return ip_vs_in(hooknum, skb, AF_INET); | |
1673 | } | |
1674 | ||
1675 | /* | |
1676 | * AF_INET handler in NF_INET_LOCAL_OUT chain | |
1677 | * Schedule and forward packets from local clients | |
1678 | */ | |
1679 | static unsigned int | |
1680 | ip_vs_local_request4(unsigned int hooknum, struct sk_buff *skb, | |
1681 | const struct net_device *in, const struct net_device *out, | |
1682 | int (*okfn)(struct sk_buff *)) | |
1683 | { | |
1684 | unsigned int verdict; | |
1685 | ||
1686 | /* Disable BH in LOCAL_OUT until all places are fixed */ | |
1687 | local_bh_disable(); | |
1688 | verdict = ip_vs_in(hooknum, skb, AF_INET); | |
1689 | local_bh_enable(); | |
1690 | return verdict; | |
1691 | } | |
1692 | ||
1693 | #ifdef CONFIG_IP_VS_IPV6 | |
1694 | ||
1695 | /* | |
1696 | * AF_INET6 handler in NF_INET_LOCAL_IN chain | |
1697 | * Schedule and forward packets from remote clients | |
1698 | */ | |
1699 | static unsigned int | |
1700 | ip_vs_remote_request6(unsigned int hooknum, struct sk_buff *skb, | |
1701 | const struct net_device *in, | |
1702 | const struct net_device *out, | |
1703 | int (*okfn)(struct sk_buff *)) | |
1704 | { | |
1705 | return ip_vs_in(hooknum, skb, AF_INET6); | |
1706 | } | |
1707 | ||
1708 | /* | |
1709 | * AF_INET6 handler in NF_INET_LOCAL_OUT chain | |
1710 | * Schedule and forward packets from local clients | |
1711 | */ | |
1712 | static unsigned int | |
1713 | ip_vs_local_request6(unsigned int hooknum, struct sk_buff *skb, | |
1714 | const struct net_device *in, const struct net_device *out, | |
1715 | int (*okfn)(struct sk_buff *)) | |
1716 | { | |
1717 | unsigned int verdict; | |
1718 | ||
1719 | /* Disable BH in LOCAL_OUT until all places are fixed */ | |
1720 | local_bh_disable(); | |
1721 | verdict = ip_vs_in(hooknum, skb, AF_INET6); | |
1722 | local_bh_enable(); | |
1723 | return verdict; | |
1724 | } | |
1725 | ||
1726 | #endif | |
1727 | ||
1728 | ||
1729 | /* | |
1730 | * It is hooked at the NF_INET_FORWARD chain, in order to catch ICMP | |
1731 | * related packets destined for 0.0.0.0/0. | |
1732 | * When fwmark-based virtual service is used, such as transparent | |
1733 | * cache cluster, TCP packets can be marked and routed to ip_vs_in, | |
1734 | * but ICMP destined for 0.0.0.0/0 cannot not be easily marked and | |
1735 | * sent to ip_vs_in_icmp. So, catch them at the NF_INET_FORWARD chain | |
1736 | * and send them to ip_vs_in_icmp. | |
1737 | */ | |
1738 | static unsigned int | |
1739 | ip_vs_forward_icmp(unsigned int hooknum, struct sk_buff *skb, | |
1740 | const struct net_device *in, const struct net_device *out, | |
1741 | int (*okfn)(struct sk_buff *)) | |
1742 | { | |
1743 | int r; | |
1744 | ||
1745 | if (ip_hdr(skb)->protocol != IPPROTO_ICMP) | |
1746 | return NF_ACCEPT; | |
1747 | ||
1748 | return ip_vs_in_icmp(skb, &r, hooknum); | |
1749 | } | |
1750 | ||
1751 | #ifdef CONFIG_IP_VS_IPV6 | |
1752 | static unsigned int | |
1753 | ip_vs_forward_icmp_v6(unsigned int hooknum, struct sk_buff *skb, | |
1754 | const struct net_device *in, const struct net_device *out, | |
1755 | int (*okfn)(struct sk_buff *)) | |
1756 | { | |
1757 | int r; | |
1758 | ||
1759 | if (ipv6_hdr(skb)->nexthdr != IPPROTO_ICMPV6) | |
1760 | return NF_ACCEPT; | |
1761 | ||
1762 | return ip_vs_in_icmp_v6(skb, &r, hooknum); | |
1763 | } | |
1764 | #endif | |
1765 | ||
1766 | ||
1767 | static struct nf_hook_ops ip_vs_ops[] __read_mostly = { | |
1768 | /* After packet filtering, change source only for VS/NAT */ | |
1769 | { | |
1770 | .hook = ip_vs_reply4, | |
1771 | .owner = THIS_MODULE, | |
1772 | .pf = PF_INET, | |
1773 | .hooknum = NF_INET_LOCAL_IN, | |
1774 | .priority = 99, | |
1775 | }, | |
1776 | /* After packet filtering, forward packet through VS/DR, VS/TUN, | |
1777 | * or VS/NAT(change destination), so that filtering rules can be | |
1778 | * applied to IPVS. */ | |
1779 | { | |
1780 | .hook = ip_vs_remote_request4, | |
1781 | .owner = THIS_MODULE, | |
1782 | .pf = PF_INET, | |
1783 | .hooknum = NF_INET_LOCAL_IN, | |
1784 | .priority = 101, | |
1785 | }, | |
1786 | /* Before ip_vs_in, change source only for VS/NAT */ | |
1787 | { | |
1788 | .hook = ip_vs_local_reply4, | |
1789 | .owner = THIS_MODULE, | |
1790 | .pf = PF_INET, | |
1791 | .hooknum = NF_INET_LOCAL_OUT, | |
1792 | .priority = -99, | |
1793 | }, | |
1794 | /* After mangle, schedule and forward local requests */ | |
1795 | { | |
1796 | .hook = ip_vs_local_request4, | |
1797 | .owner = THIS_MODULE, | |
1798 | .pf = PF_INET, | |
1799 | .hooknum = NF_INET_LOCAL_OUT, | |
1800 | .priority = -98, | |
1801 | }, | |
1802 | /* After packet filtering (but before ip_vs_out_icmp), catch icmp | |
1803 | * destined for 0.0.0.0/0, which is for incoming IPVS connections */ | |
1804 | { | |
1805 | .hook = ip_vs_forward_icmp, | |
1806 | .owner = THIS_MODULE, | |
1807 | .pf = PF_INET, | |
1808 | .hooknum = NF_INET_FORWARD, | |
1809 | .priority = 99, | |
1810 | }, | |
1811 | /* After packet filtering, change source only for VS/NAT */ | |
1812 | { | |
1813 | .hook = ip_vs_reply4, | |
1814 | .owner = THIS_MODULE, | |
1815 | .pf = PF_INET, | |
1816 | .hooknum = NF_INET_FORWARD, | |
1817 | .priority = 100, | |
1818 | }, | |
1819 | #ifdef CONFIG_IP_VS_IPV6 | |
1820 | /* After packet filtering, change source only for VS/NAT */ | |
1821 | { | |
1822 | .hook = ip_vs_reply6, | |
1823 | .owner = THIS_MODULE, | |
1824 | .pf = PF_INET6, | |
1825 | .hooknum = NF_INET_LOCAL_IN, | |
1826 | .priority = 99, | |
1827 | }, | |
1828 | /* After packet filtering, forward packet through VS/DR, VS/TUN, | |
1829 | * or VS/NAT(change destination), so that filtering rules can be | |
1830 | * applied to IPVS. */ | |
1831 | { | |
1832 | .hook = ip_vs_remote_request6, | |
1833 | .owner = THIS_MODULE, | |
1834 | .pf = PF_INET6, | |
1835 | .hooknum = NF_INET_LOCAL_IN, | |
1836 | .priority = 101, | |
1837 | }, | |
1838 | /* Before ip_vs_in, change source only for VS/NAT */ | |
1839 | { | |
1840 | .hook = ip_vs_local_reply6, | |
1841 | .owner = THIS_MODULE, | |
1842 | .pf = PF_INET, | |
1843 | .hooknum = NF_INET_LOCAL_OUT, | |
1844 | .priority = -99, | |
1845 | }, | |
1846 | /* After mangle, schedule and forward local requests */ | |
1847 | { | |
1848 | .hook = ip_vs_local_request6, | |
1849 | .owner = THIS_MODULE, | |
1850 | .pf = PF_INET6, | |
1851 | .hooknum = NF_INET_LOCAL_OUT, | |
1852 | .priority = -98, | |
1853 | }, | |
1854 | /* After packet filtering (but before ip_vs_out_icmp), catch icmp | |
1855 | * destined for 0.0.0.0/0, which is for incoming IPVS connections */ | |
1856 | { | |
1857 | .hook = ip_vs_forward_icmp_v6, | |
1858 | .owner = THIS_MODULE, | |
1859 | .pf = PF_INET6, | |
1860 | .hooknum = NF_INET_FORWARD, | |
1861 | .priority = 99, | |
1862 | }, | |
1863 | /* After packet filtering, change source only for VS/NAT */ | |
1864 | { | |
1865 | .hook = ip_vs_reply6, | |
1866 | .owner = THIS_MODULE, | |
1867 | .pf = PF_INET6, | |
1868 | .hooknum = NF_INET_FORWARD, | |
1869 | .priority = 100, | |
1870 | }, | |
1871 | #endif | |
1872 | }; | |
1873 | /* | |
1874 | * Initialize IP Virtual Server netns mem. | |
1875 | */ | |
1876 | static int __net_init __ip_vs_init(struct net *net) | |
1877 | { | |
1878 | struct netns_ipvs *ipvs; | |
1879 | ||
1880 | ipvs = net_generic(net, ip_vs_net_id); | |
1881 | if (ipvs == NULL) { | |
1882 | pr_err("%s(): no memory.\n", __func__); | |
1883 | return -ENOMEM; | |
1884 | } | |
1885 | ipvs->net = net; | |
1886 | /* Counters used for creating unique names */ | |
1887 | ipvs->gen = atomic_read(&ipvs_netns_cnt); | |
1888 | atomic_inc(&ipvs_netns_cnt); | |
1889 | net->ipvs = ipvs; | |
1890 | printk(KERN_INFO "IPVS: Creating netns size=%lu id=%d\n", | |
1891 | sizeof(struct netns_ipvs), ipvs->gen); | |
1892 | return 0; | |
1893 | } | |
1894 | ||
1895 | static void __net_exit __ip_vs_cleanup(struct net *net) | |
1896 | { | |
1897 | IP_VS_DBG(10, "ipvs netns %d released\n", net_ipvs(net)->gen); | |
1898 | } | |
1899 | ||
1900 | static struct pernet_operations ipvs_core_ops = { | |
1901 | .init = __ip_vs_init, | |
1902 | .exit = __ip_vs_cleanup, | |
1903 | .id = &ip_vs_net_id, | |
1904 | .size = sizeof(struct netns_ipvs), | |
1905 | }; | |
1906 | ||
1907 | /* | |
1908 | * Initialize IP Virtual Server | |
1909 | */ | |
1910 | static int __init ip_vs_init(void) | |
1911 | { | |
1912 | int ret; | |
1913 | ||
1914 | ret = register_pernet_subsys(&ipvs_core_ops); /* Alloc ip_vs struct */ | |
1915 | if (ret < 0) | |
1916 | return ret; | |
1917 | ||
1918 | ip_vs_estimator_init(); | |
1919 | ret = ip_vs_control_init(); | |
1920 | if (ret < 0) { | |
1921 | pr_err("can't setup control.\n"); | |
1922 | goto cleanup_estimator; | |
1923 | } | |
1924 | ||
1925 | ip_vs_protocol_init(); | |
1926 | ||
1927 | ret = ip_vs_app_init(); | |
1928 | if (ret < 0) { | |
1929 | pr_err("can't setup application helper.\n"); | |
1930 | goto cleanup_protocol; | |
1931 | } | |
1932 | ||
1933 | ret = ip_vs_conn_init(); | |
1934 | if (ret < 0) { | |
1935 | pr_err("can't setup connection table.\n"); | |
1936 | goto cleanup_app; | |
1937 | } | |
1938 | ||
1939 | ret = ip_vs_sync_init(); | |
1940 | if (ret < 0) { | |
1941 | pr_err("can't setup sync data.\n"); | |
1942 | goto cleanup_conn; | |
1943 | } | |
1944 | ||
1945 | ret = nf_register_hooks(ip_vs_ops, ARRAY_SIZE(ip_vs_ops)); | |
1946 | if (ret < 0) { | |
1947 | pr_err("can't register hooks.\n"); | |
1948 | goto cleanup_sync; | |
1949 | } | |
1950 | ||
1951 | pr_info("ipvs loaded.\n"); | |
1952 | return ret; | |
1953 | ||
1954 | cleanup_sync: | |
1955 | ip_vs_sync_cleanup(); | |
1956 | cleanup_conn: | |
1957 | ip_vs_conn_cleanup(); | |
1958 | cleanup_app: | |
1959 | ip_vs_app_cleanup(); | |
1960 | cleanup_protocol: | |
1961 | ip_vs_protocol_cleanup(); | |
1962 | ip_vs_control_cleanup(); | |
1963 | cleanup_estimator: | |
1964 | ip_vs_estimator_cleanup(); | |
1965 | unregister_pernet_subsys(&ipvs_core_ops); /* free ip_vs struct */ | |
1966 | return ret; | |
1967 | } | |
1968 | ||
1969 | static void __exit ip_vs_cleanup(void) | |
1970 | { | |
1971 | nf_unregister_hooks(ip_vs_ops, ARRAY_SIZE(ip_vs_ops)); | |
1972 | ip_vs_sync_cleanup(); | |
1973 | ip_vs_conn_cleanup(); | |
1974 | ip_vs_app_cleanup(); | |
1975 | ip_vs_protocol_cleanup(); | |
1976 | ip_vs_control_cleanup(); | |
1977 | ip_vs_estimator_cleanup(); | |
1978 | unregister_pernet_subsys(&ipvs_core_ops); /* free ip_vs struct */ | |
1979 | pr_info("ipvs unloaded.\n"); | |
1980 | } | |
1981 | ||
1982 | module_init(ip_vs_init); | |
1983 | module_exit(ip_vs_cleanup); | |
1984 | MODULE_LICENSE("GPL"); |