ipvs: fix sparse warnings for some parameters
[deliverable/linux.git] / net / netfilter / ipvs / ip_vs_core.c
CommitLineData
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>
2c70b519 43#include <net/ip6_checksum.h>
61b1ab45 44#include <net/netns/generic.h> /* net_generic() */
1da177e4
LT
45
46#include <linux/netfilter.h>
47#include <linux/netfilter_ipv4.h>
48
2a3b791e
JV
49#ifdef CONFIG_IP_VS_IPV6
50#include <net/ipv6.h>
51#include <linux/netfilter_ipv6.h>
489fdeda 52#include <net/ip6_route.h>
2a3b791e
JV
53#endif
54
1da177e4
LT
55#include <net/ip_vs.h>
56
57
58EXPORT_SYMBOL(register_ip_vs_scheduler);
59EXPORT_SYMBOL(unregister_ip_vs_scheduler);
1da177e4
LT
60EXPORT_SYMBOL(ip_vs_proto_name);
61EXPORT_SYMBOL(ip_vs_conn_new);
62EXPORT_SYMBOL(ip_vs_conn_in_get);
63EXPORT_SYMBOL(ip_vs_conn_out_get);
64#ifdef CONFIG_IP_VS_PROTO_TCP
65EXPORT_SYMBOL(ip_vs_tcp_conn_listen);
66#endif
67EXPORT_SYMBOL(ip_vs_conn_put);
68#ifdef CONFIG_IP_VS_DEBUG
69EXPORT_SYMBOL(ip_vs_get_debug_level);
70#endif
1da177e4 71
b962abdc 72static int ip_vs_net_id __read_mostly;
61b1ab45
HS
73/* netns cnt used for uniqueness */
74static atomic_t ipvs_netns_cnt = ATOMIC_INIT(0);
1da177e4
LT
75
76/* ID used in ICMP lookups */
77#define icmp_id(icmph) (((icmph)->un).echo.id)
2a3b791e 78#define icmpv6_id(icmph) (icmph->icmp6_dataun.u_echo.identifier)
1da177e4 79
95c96174 80const char *ip_vs_proto_name(unsigned int proto)
1da177e4
LT
81{
82 static char buf[20];
83
84 switch (proto) {
85 case IPPROTO_IP:
86 return "IP";
87 case IPPROTO_UDP:
88 return "UDP";
89 case IPPROTO_TCP:
90 return "TCP";
2906f66a
VMR
91 case IPPROTO_SCTP:
92 return "SCTP";
1da177e4
LT
93 case IPPROTO_ICMP:
94 return "ICMP";
2a3b791e
JV
95#ifdef CONFIG_IP_VS_IPV6
96 case IPPROTO_ICMPV6:
97 return "ICMPv6";
98#endif
1da177e4
LT
99 default:
100 sprintf(buf, "IP_%d", proto);
101 return buf;
102 }
103}
104
105void ip_vs_init_hash_table(struct list_head *table, int rows)
106{
107 while (--rows >= 0)
108 INIT_LIST_HEAD(&table[rows]);
109}
110
111static inline void
112ip_vs_in_stats(struct ip_vs_conn *cp, struct sk_buff *skb)
113{
114 struct ip_vs_dest *dest = cp->dest;
b17fc996
HS
115 struct netns_ipvs *ipvs = net_ipvs(skb_net(skb));
116
1da177e4 117 if (dest && (dest->flags & IP_VS_DEST_F_AVAILABLE)) {
b17fc996
HS
118 struct ip_vs_cpu_stats *s;
119
120 s = this_cpu_ptr(dest->stats.cpustats);
121 s->ustats.inpkts++;
122 u64_stats_update_begin(&s->syncp);
123 s->ustats.inbytes += skb->len;
124 u64_stats_update_end(&s->syncp);
125
126 s = this_cpu_ptr(dest->svc->stats.cpustats);
127 s->ustats.inpkts++;
128 u64_stats_update_begin(&s->syncp);
129 s->ustats.inbytes += skb->len;
130 u64_stats_update_end(&s->syncp);
131
2a0751af 132 s = this_cpu_ptr(ipvs->tot_stats.cpustats);
b17fc996
HS
133 s->ustats.inpkts++;
134 u64_stats_update_begin(&s->syncp);
135 s->ustats.inbytes += skb->len;
136 u64_stats_update_end(&s->syncp);
1da177e4
LT
137 }
138}
139
140
141static inline void
142ip_vs_out_stats(struct ip_vs_conn *cp, struct sk_buff *skb)
143{
144 struct ip_vs_dest *dest = cp->dest;
b17fc996
HS
145 struct netns_ipvs *ipvs = net_ipvs(skb_net(skb));
146
1da177e4 147 if (dest && (dest->flags & IP_VS_DEST_F_AVAILABLE)) {
b17fc996
HS
148 struct ip_vs_cpu_stats *s;
149
150 s = this_cpu_ptr(dest->stats.cpustats);
151 s->ustats.outpkts++;
152 u64_stats_update_begin(&s->syncp);
153 s->ustats.outbytes += skb->len;
154 u64_stats_update_end(&s->syncp);
155
156 s = this_cpu_ptr(dest->svc->stats.cpustats);
157 s->ustats.outpkts++;
158 u64_stats_update_begin(&s->syncp);
159 s->ustats.outbytes += skb->len;
160 u64_stats_update_end(&s->syncp);
161
2a0751af 162 s = this_cpu_ptr(ipvs->tot_stats.cpustats);
b17fc996
HS
163 s->ustats.outpkts++;
164 u64_stats_update_begin(&s->syncp);
165 s->ustats.outbytes += skb->len;
166 u64_stats_update_end(&s->syncp);
1da177e4
LT
167 }
168}
169
170
171static inline void
172ip_vs_conn_stats(struct ip_vs_conn *cp, struct ip_vs_service *svc)
173{
b17fc996
HS
174 struct netns_ipvs *ipvs = net_ipvs(svc->net);
175 struct ip_vs_cpu_stats *s;
1da177e4 176
b17fc996
HS
177 s = this_cpu_ptr(cp->dest->stats.cpustats);
178 s->ustats.conns++;
1da177e4 179
b17fc996
HS
180 s = this_cpu_ptr(svc->stats.cpustats);
181 s->ustats.conns++;
182
2a0751af 183 s = this_cpu_ptr(ipvs->tot_stats.cpustats);
b17fc996 184 s->ustats.conns++;
1da177e4
LT
185}
186
187
4a516f11 188static inline void
1da177e4
LT
189ip_vs_set_state(struct ip_vs_conn *cp, int direction,
190 const struct sk_buff *skb,
9330419d 191 struct ip_vs_proto_data *pd)
1da177e4 192{
4a516f11
SH
193 if (likely(pd->pp->state_transition))
194 pd->pp->state_transition(cp, direction, skb, pd);
1da177e4
LT
195}
196
a5959d53 197static inline int
85999283
SH
198ip_vs_conn_fill_param_persist(const struct ip_vs_service *svc,
199 struct sk_buff *skb, int protocol,
200 const union nf_inet_addr *caddr, __be16 cport,
201 const union nf_inet_addr *vaddr, __be16 vport,
202 struct ip_vs_conn_param *p)
203{
6e67e586
HS
204 ip_vs_conn_fill_param(svc->net, svc->af, protocol, caddr, cport, vaddr,
205 vport, p);
ceec4c38 206 p->pe = rcu_dereference(svc->pe);
85999283 207 if (p->pe && p->pe->fill_param)
a5959d53
HS
208 return p->pe->fill_param(p, skb);
209
210 return 0;
85999283 211}
1da177e4 212
1da177e4
LT
213/*
214 * IPVS persistent scheduling function
215 * It creates a connection entry according to its template if exists,
216 * or selects a server and creates a connection entry plus a template.
217 * Locking: we are svc user (svc->refcnt), so we hold all dests too
218 * Protocols supported: TCP, UDP
219 */
220static struct ip_vs_conn *
221ip_vs_sched_persist(struct ip_vs_service *svc,
d4383f04
JDB
222 struct sk_buff *skb, __be16 src_port, __be16 dst_port,
223 int *ignored, struct ip_vs_iphdr *iph)
1da177e4
LT
224{
225 struct ip_vs_conn *cp = NULL;
1da177e4
LT
226 struct ip_vs_dest *dest;
227 struct ip_vs_conn *ct;
5b57a98c 228 __be16 dport = 0; /* destination port to forward */
3575792e 229 unsigned int flags;
f11017ec 230 struct ip_vs_conn_param param;
e0aac52e 231 const union nf_inet_addr fwmark = { .ip = htonl(svc->fwmark) };
28364a59
JV
232 union nf_inet_addr snet; /* source network of the client,
233 after masking */
cd17f9ed 234
1da177e4 235 /* Mask saddr with the netmask to adjust template granularity */
cd17f9ed
JV
236#ifdef CONFIG_IP_VS_IPV6
237 if (svc->af == AF_INET6)
0a925864
JA
238 ipv6_addr_prefix(&snet.in6, &iph->saddr.in6,
239 (__force __u32) svc->netmask);
cd17f9ed
JV
240 else
241#endif
d4383f04 242 snet.ip = iph->saddr.ip & svc->netmask;
1da177e4 243
cd17f9ed
JV
244 IP_VS_DBG_BUF(6, "p-schedule: src %s:%u dest %s:%u "
245 "mnet %s\n",
d4383f04
JDB
246 IP_VS_DBG_ADDR(svc->af, &iph->saddr), ntohs(src_port),
247 IP_VS_DBG_ADDR(svc->af, &iph->daddr), ntohs(dst_port),
cd17f9ed 248 IP_VS_DBG_ADDR(svc->af, &snet));
1da177e4
LT
249
250 /*
251 * As far as we know, FTP is a very complicated network protocol, and
252 * it uses control connection and data connections. For active FTP,
253 * FTP server initialize data connection to the client, its source port
254 * is often 20. For passive FTP, FTP server tells the clients the port
255 * that it passively listens to, and the client issues the data
256 * connection. In the tunneling or direct routing mode, the load
257 * balancer is on the client-to-server half of connection, the port
258 * number is unknown to the load balancer. So, a conn template like
259 * <caddr, 0, vaddr, 0, daddr, 0> is created for persistent FTP
260 * service, and a template like <caddr, 0, vaddr, vport, daddr, dport>
261 * is created for other persistent services.
262 */
5b57a98c 263 {
d4383f04
JDB
264 int protocol = iph->protocol;
265 const union nf_inet_addr *vaddr = &iph->daddr;
f11017ec
SH
266 __be16 vport = 0;
267
ce144f24 268 if (dst_port == svc->port) {
5b57a98c
SH
269 /* non-FTP template:
270 * <protocol, caddr, 0, vaddr, vport, daddr, dport>
271 * FTP template:
272 * <protocol, caddr, 0, vaddr, 0, daddr, 0>
1da177e4
LT
273 */
274 if (svc->port != FTPPORT)
ce144f24 275 vport = dst_port;
1da177e4 276 } else {
5b57a98c
SH
277 /* Note: persistent fwmark-based services and
278 * persistent port zero service are handled here.
279 * fwmark template:
280 * <IPPROTO_IP,caddr,0,fwmark,0,daddr,0>
281 * port zero template:
282 * <protocol,caddr,0,vaddr,0,daddr,0>
1da177e4 283 */
28364a59 284 if (svc->fwmark) {
5b57a98c
SH
285 protocol = IPPROTO_IP;
286 vaddr = &fwmark;
287 }
1da177e4 288 }
a5959d53
HS
289 /* return *ignored = -1 so NF_DROP can be used */
290 if (ip_vs_conn_fill_param_persist(svc, skb, protocol, &snet, 0,
291 vaddr, vport, &param) < 0) {
292 *ignored = -1;
293 return NULL;
294 }
1da177e4
LT
295 }
296
5b57a98c 297 /* Check if a template already exists */
f11017ec 298 ct = ip_vs_ct_in_get(&param);
5b57a98c 299 if (!ct || !ip_vs_check_template(ct)) {
ceec4c38
JA
300 struct ip_vs_scheduler *sched;
301
a5959d53
HS
302 /*
303 * No template found or the dest of the connection
5b57a98c 304 * template is not available.
a5959d53 305 * return *ignored=0 i.e. ICMP and NF_DROP
5b57a98c 306 */
ceec4c38
JA
307 sched = rcu_dereference(svc->scheduler);
308 dest = sched->schedule(svc, skb);
5b57a98c
SH
309 if (!dest) {
310 IP_VS_DBG(1, "p-schedule: no dest found.\n");
85999283 311 kfree(param.pe_data);
a5959d53 312 *ignored = 0;
5b57a98c
SH
313 return NULL;
314 }
315
ce144f24 316 if (dst_port == svc->port && svc->port != FTPPORT)
5b57a98c
SH
317 dport = dest->port;
318
85999283
SH
319 /* Create a template
320 * This adds param.pe_data to the template,
321 * and thus param.pe_data will be destroyed
322 * when the template expires */
f11017ec 323 ct = ip_vs_conn_new(&param, &dest->addr, dport,
0e051e68 324 IP_VS_CONN_F_TEMPLATE, dest, skb->mark);
85999283
SH
325 if (ct == NULL) {
326 kfree(param.pe_data);
a5959d53 327 *ignored = -1;
5b57a98c 328 return NULL;
85999283 329 }
5b57a98c
SH
330
331 ct->timeout = svc->timeout;
85999283 332 } else {
5b57a98c
SH
333 /* set destination with the found template */
334 dest = ct->dest;
85999283
SH
335 kfree(param.pe_data);
336 }
5b57a98c 337
ce144f24 338 dport = dst_port;
5b57a98c
SH
339 if (dport == svc->port && dest->port)
340 dport = dest->port;
341
26ec037f 342 flags = (svc->flags & IP_VS_SVC_F_ONEPACKET
d4383f04 343 && iph->protocol == IPPROTO_UDP) ?
26ec037f
NC
344 IP_VS_CONN_F_ONE_PACKET : 0;
345
1da177e4
LT
346 /*
347 * Create a new connection according to the template
348 */
d4383f04
JDB
349 ip_vs_conn_fill_param(svc->net, svc->af, iph->protocol, &iph->saddr,
350 src_port, &iph->daddr, dst_port, &param);
ce144f24 351
0e051e68 352 cp = ip_vs_conn_new(&param, &dest->addr, dport, flags, dest, skb->mark);
1da177e4
LT
353 if (cp == NULL) {
354 ip_vs_conn_put(ct);
a5959d53 355 *ignored = -1;
1da177e4
LT
356 return NULL;
357 }
358
359 /*
360 * Add its control
361 */
362 ip_vs_control_add(cp, ct);
363 ip_vs_conn_put(ct);
364
365 ip_vs_conn_stats(cp, svc);
366 return cp;
367}
368
369
370/*
371 * IPVS main scheduling function
372 * It selects a server according to the virtual service, and
373 * creates a connection entry.
374 * Protocols supported: TCP, UDP
a5959d53
HS
375 *
376 * Usage of *ignored
377 *
378 * 1 : protocol tried to schedule (eg. on SYN), found svc but the
379 * svc/scheduler decides that this packet should be accepted with
380 * NF_ACCEPT because it must not be scheduled.
381 *
382 * 0 : scheduler can not find destination, so try bypass or
383 * return ICMP and then NF_DROP (ip_vs_leave).
384 *
385 * -1 : scheduler tried to schedule but fatal error occurred, eg.
386 * ip_vs_conn_new failure (ENOMEM) or ip_vs_sip_fill_param
387 * failure such as missing Call-ID, ENOMEM on skb_linearize
388 * or pe_data. In this case we should return NF_DROP without
389 * any attempts to send ICMP with ip_vs_leave.
1da177e4
LT
390 */
391struct ip_vs_conn *
190ecd27 392ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb,
d4383f04
JDB
393 struct ip_vs_proto_data *pd, int *ignored,
394 struct ip_vs_iphdr *iph)
1da177e4 395{
9330419d 396 struct ip_vs_protocol *pp = pd->pp;
1da177e4 397 struct ip_vs_conn *cp = NULL;
ceec4c38 398 struct ip_vs_scheduler *sched;
1da177e4 399 struct ip_vs_dest *dest;
3575792e
JA
400 __be16 _ports[2], *pptr;
401 unsigned int flags;
1da177e4 402
190ecd27 403 *ignored = 1;
2f74713d
JDB
404 /*
405 * IPv6 frags, only the first hit here.
406 */
d4383f04 407 pptr = frag_safe_skb_hp(skb, iph->len, sizeof(_ports), _ports, iph);
1da177e4
LT
408 if (pptr == NULL)
409 return NULL;
410
190ecd27
JA
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) {
0d79641a
JA
418 IP_VS_DBG_PKT(12, svc->af, pp, skb, 0,
419 "Not scheduling FTPDATA");
190ecd27
JA
420 return NULL;
421 }
422
423 /*
a5959d53 424 * Do not schedule replies from local real server.
190ecd27
JA
425 */
426 if ((!skb->dev || skb->dev->flags & IFF_LOOPBACK) &&
d4383f04 427 (cp = pp->conn_in_get(svc->af, skb, iph, 1))) {
0d79641a 428 IP_VS_DBG_PKT(12, svc->af, pp, skb, 0,
190ecd27
JA
429 "Not scheduling reply for existing connection");
430 __ip_vs_conn_put(cp);
431 return NULL;
432 }
433
1da177e4
LT
434 /*
435 * Persistent service
436 */
a5959d53 437 if (svc->flags & IP_VS_SVC_F_PERSISTENT)
d4383f04
JDB
438 return ip_vs_sched_persist(svc, skb, pptr[0], pptr[1], ignored,
439 iph);
a5959d53
HS
440
441 *ignored = 0;
1da177e4
LT
442
443 /*
444 * Non-persistent service
445 */
446 if (!svc->fwmark && pptr[1] != svc->port) {
447 if (!svc->port)
1e3e238e
HE
448 pr_err("Schedule: port zero only supported "
449 "in persistent services, "
450 "check your ipvs configuration\n");
1da177e4
LT
451 return NULL;
452 }
453
ceec4c38
JA
454 sched = rcu_dereference(svc->scheduler);
455 dest = sched->schedule(svc, skb);
1da177e4
LT
456 if (dest == NULL) {
457 IP_VS_DBG(1, "Schedule: no dest found.\n");
458 return NULL;
459 }
460
26ec037f 461 flags = (svc->flags & IP_VS_SVC_F_ONEPACKET
d4383f04 462 && iph->protocol == IPPROTO_UDP) ?
26ec037f
NC
463 IP_VS_CONN_F_ONE_PACKET : 0;
464
1da177e4
LT
465 /*
466 * Create a connection entry.
467 */
f11017ec
SH
468 {
469 struct ip_vs_conn_param p;
6e67e586 470
d4383f04
JDB
471 ip_vs_conn_fill_param(svc->net, svc->af, iph->protocol,
472 &iph->saddr, pptr[0], &iph->daddr,
473 pptr[1], &p);
f11017ec
SH
474 cp = ip_vs_conn_new(&p, &dest->addr,
475 dest->port ? dest->port : pptr[1],
0e051e68 476 flags, dest, skb->mark);
a5959d53
HS
477 if (!cp) {
478 *ignored = -1;
f11017ec 479 return NULL;
a5959d53 480 }
f11017ec 481 }
1da177e4 482
cd17f9ed
JV
483 IP_VS_DBG_BUF(6, "Schedule fwd:%c c:%s:%u v:%s:%u "
484 "d:%s:%u conn->flags:%X conn->refcnt:%d\n",
485 ip_vs_fwd_tag(cp),
486 IP_VS_DBG_ADDR(svc->af, &cp->caddr), ntohs(cp->cport),
487 IP_VS_DBG_ADDR(svc->af, &cp->vaddr), ntohs(cp->vport),
488 IP_VS_DBG_ADDR(svc->af, &cp->daddr), ntohs(cp->dport),
489 cp->flags, atomic_read(&cp->refcnt));
1da177e4
LT
490
491 ip_vs_conn_stats(cp, svc);
492 return cp;
493}
494
495
496/*
497 * Pass or drop the packet.
498 * Called by ip_vs_in, when the virtual service is available but
499 * no destination is available for a new connection.
500 */
501int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
d4383f04 502 struct ip_vs_proto_data *pd, struct ip_vs_iphdr *iph)
1da177e4 503{
014d730d 504 __be16 _ports[2], *pptr;
a7a86b86
SH
505#ifdef CONFIG_SYSCTL
506 struct net *net;
507 struct netns_ipvs *ipvs;
2a3b791e 508 int unicast;
a7a86b86 509#endif
9330419d 510
d4383f04 511 pptr = frag_safe_skb_hp(skb, iph->len, sizeof(_ports), _ports, iph);
1da177e4 512 if (pptr == NULL) {
1da177e4
LT
513 return NF_DROP;
514 }
a7a86b86
SH
515
516#ifdef CONFIG_SYSCTL
4a98480b 517 net = skb_net(skb);
1da177e4 518
2a3b791e
JV
519#ifdef CONFIG_IP_VS_IPV6
520 if (svc->af == AF_INET6)
d4383f04 521 unicast = ipv6_addr_type(&iph->daddr.in6) & IPV6_ADDR_UNICAST;
2a3b791e
JV
522 else
523#endif
d4383f04 524 unicast = (inet_addr_type(net, iph->daddr.ip) == RTN_UNICAST);
2a3b791e 525
1da177e4 526 /* if it is fwmark-based service, the cache_bypass sysctl is up
2a3b791e 527 and the destination is a non-local unicast, then create
1da177e4 528 a cache_bypass connection entry */
4a98480b 529 ipvs = net_ipvs(net);
a0840e2e 530 if (ipvs->sysctl_cache_bypass && svc->fwmark && unicast) {
ad542ced 531 int ret;
1da177e4 532 struct ip_vs_conn *cp;
3575792e 533 unsigned int flags = (svc->flags & IP_VS_SVC_F_ONEPACKET &&
d4383f04 534 iph->protocol == IPPROTO_UDP) ?
3575792e 535 IP_VS_CONN_F_ONE_PACKET : 0;
dff630dd 536 union nf_inet_addr daddr = { .all = { 0, 0, 0, 0 } };
1da177e4 537
1da177e4 538 /* create a new connection entry */
1e3e238e 539 IP_VS_DBG(6, "%s(): create a cache_bypass entry\n", __func__);
f11017ec
SH
540 {
541 struct ip_vs_conn_param p;
d4383f04
JDB
542 ip_vs_conn_fill_param(svc->net, svc->af, iph->protocol,
543 &iph->saddr, pptr[0],
544 &iph->daddr, pptr[1], &p);
f11017ec
SH
545 cp = ip_vs_conn_new(&p, &daddr, 0,
546 IP_VS_CONN_F_BYPASS | flags,
0e051e68 547 NULL, skb->mark);
f11017ec
SH
548 if (!cp)
549 return NF_DROP;
550 }
1da177e4
LT
551
552 /* statistics */
553 ip_vs_in_stats(cp, skb);
554
555 /* set state */
4a516f11 556 ip_vs_set_state(cp, IP_VS_DIR_INPUT, skb, pd);
1da177e4
LT
557
558 /* transmit the first SYN packet */
d4383f04 559 ret = cp->packet_xmit(skb, cp, pd->pp, iph);
1da177e4
LT
560 /* do not touch skb anymore */
561
562 atomic_inc(&cp->in_pkts);
563 ip_vs_conn_put(cp);
564 return ret;
565 }
a7a86b86 566#endif
1da177e4
LT
567
568 /*
569 * When the virtual ftp service is presented, packets destined
570 * for other services on the VIP may get here (except services
571 * listed in the ipvs table), pass the packets, because it is
572 * not ipvs job to decide to drop the packets.
573 */
ceec4c38 574 if ((svc->port == FTPPORT) && (pptr[1] != FTPPORT))
1da177e4 575 return NF_ACCEPT;
1da177e4
LT
576
577 /*
578 * Notify the client that the destination is unreachable, and
579 * release the socket buffer.
580 * Since it is in IP layer, the TCP socket is not actually
581 * created, the TCP RST packet cannot be sent, instead that
582 * ICMP_PORT_UNREACH is sent here no matter it is TCP/UDP. --WZ
583 */
2a3b791e 584#ifdef CONFIG_IP_VS_IPV6
cb59155f
JA
585 if (svc->af == AF_INET6) {
586 if (!skb->dev) {
587 struct net *net = dev_net(skb_dst(skb)->dev);
588
589 skb->dev = net->loopback_dev;
590 }
3ffe533c 591 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
cb59155f 592 } else
2a3b791e
JV
593#endif
594 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
595
1da177e4
LT
596 return NF_DROP;
597}
598
84b3cee3
SH
599#ifdef CONFIG_SYSCTL
600
601static int sysctl_snat_reroute(struct sk_buff *skb)
602{
603 struct netns_ipvs *ipvs = net_ipvs(skb_net(skb));
604 return ipvs->sysctl_snat_reroute;
605}
606
0cfa558e
SH
607static int sysctl_nat_icmp_send(struct net *net)
608{
609 struct netns_ipvs *ipvs = net_ipvs(net);
610 return ipvs->sysctl_nat_icmp_send;
611}
612
71a8ab6c
SH
613static int sysctl_expire_nodest_conn(struct netns_ipvs *ipvs)
614{
615 return ipvs->sysctl_expire_nodest_conn;
616}
617
84b3cee3
SH
618#else
619
620static int sysctl_snat_reroute(struct sk_buff *skb) { return 0; }
0cfa558e 621static int sysctl_nat_icmp_send(struct net *net) { return 0; }
71a8ab6c 622static int sysctl_expire_nodest_conn(struct netns_ipvs *ipvs) { return 0; }
84b3cee3
SH
623
624#endif
625
b1550f22 626__sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset)
1da177e4 627{
d3bc23e7 628 return csum_fold(skb_checksum(skb, offset, skb->len - offset, 0));
1da177e4
LT
629}
630
1ca5bb54
JA
631static inline enum ip_defrag_users ip_vs_defrag_user(unsigned int hooknum)
632{
633 if (NF_INET_LOCAL_IN == hooknum)
634 return IP_DEFRAG_VS_IN;
635 if (NF_INET_FORWARD == hooknum)
636 return IP_DEFRAG_VS_FWD;
637 return IP_DEFRAG_VS_OUT;
638}
639
776c729e 640static inline int ip_vs_gather_frags(struct sk_buff *skb, u_int32_t user)
1da177e4 641{
ac69269a 642 int err;
776c729e 643
ac69269a
JA
644 local_bh_disable();
645 err = ip_defrag(skb, user);
646 local_bh_enable();
776c729e 647 if (!err)
eddc9ec5 648 ip_send_check(ip_hdr(skb));
776c729e
HX
649
650 return err;
1da177e4
LT
651}
652
ba4fd7e9
SH
653static int ip_vs_route_me_harder(int af, struct sk_buff *skb)
654{
ba4fd7e9
SH
655#ifdef CONFIG_IP_VS_IPV6
656 if (af == AF_INET6) {
84b3cee3 657 if (sysctl_snat_reroute(skb) && ip6_route_me_harder(skb) != 0)
ba4fd7e9
SH
658 return 1;
659 } else
660#endif
84b3cee3 661 if ((sysctl_snat_reroute(skb) ||
ba4fd7e9
SH
662 skb_rtable(skb)->rt_flags & RTCF_LOCAL) &&
663 ip_route_me_harder(skb, RTN_LOCAL) != 0)
664 return 1;
665
666 return 0;
667}
668
1da177e4
LT
669/*
670 * Packet has been made sufficiently writable in caller
671 * - inout: 1=in->out, 0=out->in
672 */
673void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp,
674 struct ip_vs_conn *cp, int inout)
675{
eddc9ec5 676 struct iphdr *iph = ip_hdr(skb);
1da177e4 677 unsigned int icmp_offset = iph->ihl*4;
d56f90a7
ACM
678 struct icmphdr *icmph = (struct icmphdr *)(skb_network_header(skb) +
679 icmp_offset);
1da177e4
LT
680 struct iphdr *ciph = (struct iphdr *)(icmph + 1);
681
682 if (inout) {
e7ade46a 683 iph->saddr = cp->vaddr.ip;
1da177e4 684 ip_send_check(iph);
e7ade46a 685 ciph->daddr = cp->vaddr.ip;
1da177e4
LT
686 ip_send_check(ciph);
687 } else {
e7ade46a 688 iph->daddr = cp->daddr.ip;
1da177e4 689 ip_send_check(iph);
e7ade46a 690 ciph->saddr = cp->daddr.ip;
1da177e4
LT
691 ip_send_check(ciph);
692 }
693
2906f66a
VMR
694 /* the TCP/UDP/SCTP port */
695 if (IPPROTO_TCP == ciph->protocol || IPPROTO_UDP == ciph->protocol ||
696 IPPROTO_SCTP == ciph->protocol) {
014d730d 697 __be16 *ports = (void *)ciph + ciph->ihl*4;
1da177e4
LT
698
699 if (inout)
700 ports[1] = cp->vport;
701 else
702 ports[0] = cp->dport;
703 }
704
705 /* And finally the ICMP checksum */
706 icmph->checksum = 0;
707 icmph->checksum = ip_vs_checksum_complete(skb, icmp_offset);
708 skb->ip_summed = CHECKSUM_UNNECESSARY;
709
710 if (inout)
0d79641a 711 IP_VS_DBG_PKT(11, AF_INET, pp, skb, (void *)ciph - (void *)iph,
1da177e4
LT
712 "Forwarding altered outgoing ICMP");
713 else
0d79641a 714 IP_VS_DBG_PKT(11, AF_INET, pp, skb, (void *)ciph - (void *)iph,
1da177e4
LT
715 "Forwarding altered incoming ICMP");
716}
717
b3cdd2a7
JV
718#ifdef CONFIG_IP_VS_IPV6
719void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp,
720 struct ip_vs_conn *cp, int inout)
721{
722 struct ipv6hdr *iph = ipv6_hdr(skb);
63dca2c0
JDB
723 unsigned int icmp_offset = 0;
724 unsigned int offs = 0; /* header offset*/
725 int protocol;
726 struct icmp6hdr *icmph;
727 struct ipv6hdr *ciph;
728 unsigned short fragoffs;
729
730 ipv6_find_hdr(skb, &icmp_offset, IPPROTO_ICMPV6, &fragoffs, NULL);
731 icmph = (struct icmp6hdr *)(skb_network_header(skb) + icmp_offset);
732 offs = icmp_offset + sizeof(struct icmp6hdr);
733 ciph = (struct ipv6hdr *)(skb_network_header(skb) + offs);
734
735 protocol = ipv6_find_hdr(skb, &offs, -1, &fragoffs, NULL);
b3cdd2a7
JV
736
737 if (inout) {
738 iph->saddr = cp->vaddr.in6;
739 ciph->daddr = cp->vaddr.in6;
740 } else {
741 iph->daddr = cp->daddr.in6;
742 ciph->saddr = cp->daddr.in6;
743 }
744
2906f66a 745 /* the TCP/UDP/SCTP port */
63dca2c0
JDB
746 if (!fragoffs && (IPPROTO_TCP == protocol || IPPROTO_UDP == protocol ||
747 IPPROTO_SCTP == protocol)) {
748 __be16 *ports = (void *)(skb_network_header(skb) + offs);
b3cdd2a7 749
63dca2c0
JDB
750 IP_VS_DBG(11, "%s() changed port %d to %d\n", __func__,
751 ntohs(inout ? ports[1] : ports[0]),
752 ntohs(inout ? cp->vport : cp->dport));
b3cdd2a7
JV
753 if (inout)
754 ports[1] = cp->vport;
755 else
756 ports[0] = cp->dport;
757 }
758
759 /* And finally the ICMP checksum */
8870f842
SH
760 icmph->icmp6_cksum = ~csum_ipv6_magic(&iph->saddr, &iph->daddr,
761 skb->len - icmp_offset,
762 IPPROTO_ICMPV6, 0);
763 skb->csum_start = skb_network_header(skb) - skb->head + icmp_offset;
764 skb->csum_offset = offsetof(struct icmp6hdr, icmp6_cksum);
765 skb->ip_summed = CHECKSUM_PARTIAL;
b3cdd2a7
JV
766
767 if (inout)
0d79641a
JA
768 IP_VS_DBG_PKT(11, AF_INET6, pp, skb,
769 (void *)ciph - (void *)iph,
770 "Forwarding altered outgoing ICMPv6");
b3cdd2a7 771 else
0d79641a
JA
772 IP_VS_DBG_PKT(11, AF_INET6, pp, skb,
773 (void *)ciph - (void *)iph,
774 "Forwarding altered incoming ICMPv6");
b3cdd2a7
JV
775}
776#endif
777
4856c84c 778/* Handle relevant response ICMP messages - forward to the right
6cb90db5 779 * destination host.
4856c84c 780 */
f2428ed5
SH
781static int handle_response_icmp(int af, struct sk_buff *skb,
782 union nf_inet_addr *snet,
783 __u8 protocol, struct ip_vs_conn *cp,
4856c84c
MT
784 struct ip_vs_protocol *pp,
785 unsigned int offset, unsigned int ihl)
786{
787 unsigned int verdict = NF_DROP;
788
789 if (IP_VS_FWD_METHOD(cp) != 0) {
1e3e238e
HE
790 pr_err("shouldn't reach here, because the box is on the "
791 "half connection in the tun/dr module.\n");
4856c84c
MT
792 }
793
794 /* Ensure the checksum is correct */
795 if (!skb_csum_unnecessary(skb) && ip_vs_checksum_complete(skb, ihl)) {
796 /* Failed checksum! */
f2428ed5
SH
797 IP_VS_DBG_BUF(1, "Forward ICMP: failed checksum from %s!\n",
798 IP_VS_DBG_ADDR(af, snet));
4856c84c
MT
799 goto out;
800 }
801
2906f66a
VMR
802 if (IPPROTO_TCP == protocol || IPPROTO_UDP == protocol ||
803 IPPROTO_SCTP == protocol)
4856c84c
MT
804 offset += 2 * sizeof(__u16);
805 if (!skb_make_writable(skb, offset))
806 goto out;
807
f2428ed5
SH
808#ifdef CONFIG_IP_VS_IPV6
809 if (af == AF_INET6)
810 ip_vs_nat_icmp_v6(skb, pp, cp, 1);
811 else
812#endif
813 ip_vs_nat_icmp(skb, pp, cp, 1);
4856c84c 814
ba4fd7e9
SH
815 if (ip_vs_route_me_harder(af, skb))
816 goto out;
f5a41847 817
4856c84c
MT
818 /* do the statistics and put it back */
819 ip_vs_out_stats(cp, skb);
820
cf356d69 821 skb->ipvs_property = 1;
f4bc17cd 822 if (!(cp->flags & IP_VS_CONN_F_NFCT))
cf356d69 823 ip_vs_notrack(skb);
f4bc17cd
JA
824 else
825 ip_vs_update_conntrack(skb, cp, 0);
4856c84c
MT
826 verdict = NF_ACCEPT;
827
828out:
829 __ip_vs_conn_put(cp);
830
831 return verdict;
832}
833
1da177e4
LT
834/*
835 * Handle ICMP messages in the inside-to-outside direction (outgoing).
4856c84c 836 * Find any that might be relevant, check against existing connections.
1da177e4 837 * Currently handles error types - unreachable, quench, ttl exceeded.
1da177e4 838 */
1ca5bb54
JA
839static int ip_vs_out_icmp(struct sk_buff *skb, int *related,
840 unsigned int hooknum)
1da177e4 841{
1da177e4
LT
842 struct iphdr *iph;
843 struct icmphdr _icmph, *ic;
844 struct iphdr _ciph, *cih; /* The ip header contained within the ICMP */
51ef348b 845 struct ip_vs_iphdr ciph;
1da177e4
LT
846 struct ip_vs_conn *cp;
847 struct ip_vs_protocol *pp;
4856c84c 848 unsigned int offset, ihl;
f2428ed5 849 union nf_inet_addr snet;
1da177e4
LT
850
851 *related = 1;
852
853 /* reassemble IP fragments */
56f8a75c 854 if (ip_is_fragment(ip_hdr(skb))) {
1ca5bb54 855 if (ip_vs_gather_frags(skb, ip_vs_defrag_user(hooknum)))
1da177e4 856 return NF_STOLEN;
1da177e4
LT
857 }
858
eddc9ec5 859 iph = ip_hdr(skb);
1da177e4
LT
860 offset = ihl = iph->ihl * 4;
861 ic = skb_header_pointer(skb, offset, sizeof(_icmph), &_icmph);
862 if (ic == NULL)
863 return NF_DROP;
864
14d5e834 865 IP_VS_DBG(12, "Outgoing ICMP (%d,%d) %pI4->%pI4\n",
1da177e4 866 ic->type, ntohs(icmp_id(ic)),
14d5e834 867 &iph->saddr, &iph->daddr);
1da177e4
LT
868
869 /*
870 * Work through seeing if this is for us.
871 * These checks are supposed to be in an order that means easy
872 * things are checked first to speed up processing.... however
873 * this means that some packets will manage to get a long way
874 * down this stack and then be rejected, but that's life.
875 */
876 if ((ic->type != ICMP_DEST_UNREACH) &&
877 (ic->type != ICMP_SOURCE_QUENCH) &&
878 (ic->type != ICMP_TIME_EXCEEDED)) {
879 *related = 0;
880 return NF_ACCEPT;
881 }
882
883 /* Now find the contained IP header */
884 offset += sizeof(_icmph);
885 cih = skb_header_pointer(skb, offset, sizeof(_ciph), &_ciph);
886 if (cih == NULL)
887 return NF_ACCEPT; /* The packet looks wrong, ignore */
888
889 pp = ip_vs_proto_get(cih->protocol);
890 if (!pp)
891 return NF_ACCEPT;
892
893 /* Is the embedded protocol header present? */
4412ec49 894 if (unlikely(cih->frag_off & htons(IP_OFFSET) &&
1da177e4
LT
895 pp->dont_defrag))
896 return NF_ACCEPT;
897
0d79641a
JA
898 IP_VS_DBG_PKT(11, AF_INET, pp, skb, offset,
899 "Checking outgoing ICMP for");
1da177e4 900
63dca2c0
JDB
901 ip_vs_fill_ip4hdr(cih, &ciph);
902 ciph.len += offset;
1da177e4 903 /* The embedded headers contain source and dest in reverse order */
d4383f04 904 cp = pp->conn_out_get(AF_INET, skb, &ciph, 1);
1da177e4
LT
905 if (!cp)
906 return NF_ACCEPT;
907
f2428ed5
SH
908 snet.ip = iph->saddr;
909 return handle_response_icmp(AF_INET, skb, &snet, cih->protocol, cp,
63dca2c0 910 pp, ciph.len, ihl);
1da177e4
LT
911}
912
2a3b791e 913#ifdef CONFIG_IP_VS_IPV6
1ca5bb54 914static int ip_vs_out_icmp_v6(struct sk_buff *skb, int *related,
d4383f04 915 unsigned int hooknum, struct ip_vs_iphdr *ipvsh)
2a3b791e 916{
2a3b791e 917 struct icmp6hdr _icmph, *ic;
63dca2c0
JDB
918 struct ipv6hdr _ip6h, *ip6h; /* The ip header contained within ICMP */
919 struct ip_vs_iphdr ciph = {.flags = 0, .fragoffs = 0};/*Contained IP */
2a3b791e
JV
920 struct ip_vs_conn *cp;
921 struct ip_vs_protocol *pp;
f2428ed5 922 union nf_inet_addr snet;
63dca2c0 923 unsigned int writable;
2a3b791e 924
63dca2c0 925 *related = 1;
2f74713d 926 ic = frag_safe_skb_hp(skb, ipvsh->len, sizeof(_icmph), &_icmph, ipvsh);
2a3b791e
JV
927 if (ic == NULL)
928 return NF_DROP;
929
2a3b791e
JV
930 /*
931 * Work through seeing if this is for us.
932 * These checks are supposed to be in an order that means easy
933 * things are checked first to speed up processing.... however
934 * this means that some packets will manage to get a long way
935 * down this stack and then be rejected, but that's life.
936 */
2fab8917 937 if (ic->icmp6_type & ICMPV6_INFOMSG_MASK) {
2a3b791e
JV
938 *related = 0;
939 return NF_ACCEPT;
940 }
2f74713d
JDB
941 /* Fragment header that is before ICMP header tells us that:
942 * it's not an error message since they can't be fragmented.
943 */
e7165030 944 if (ipvsh->flags & IP6_FH_F_FRAG)
2f74713d 945 return NF_DROP;
2a3b791e 946
63dca2c0
JDB
947 IP_VS_DBG(8, "Outgoing ICMPv6 (%d,%d) %pI6c->%pI6c\n",
948 ic->icmp6_type, ntohs(icmpv6_id(ic)),
949 &ipvsh->saddr, &ipvsh->daddr);
950
2a3b791e 951 /* Now find the contained IP header */
63dca2c0
JDB
952 ciph.len = ipvsh->len + sizeof(_icmph);
953 ip6h = skb_header_pointer(skb, ciph.len, sizeof(_ip6h), &_ip6h);
954 if (ip6h == NULL)
2a3b791e 955 return NF_ACCEPT; /* The packet looks wrong, ignore */
63dca2c0
JDB
956 ciph.saddr.in6 = ip6h->saddr; /* conn_out_get() handles reverse order */
957 ciph.daddr.in6 = ip6h->daddr;
958 /* skip possible IPv6 exthdrs of contained IPv6 packet */
959 ciph.protocol = ipv6_find_hdr(skb, &ciph.len, -1, &ciph.fragoffs, NULL);
960 if (ciph.protocol < 0)
961 return NF_ACCEPT; /* Contained IPv6 hdr looks wrong, ignore */
962
963 pp = ip_vs_proto_get(ciph.protocol);
2a3b791e
JV
964 if (!pp)
965 return NF_ACCEPT;
966
2a3b791e 967 /* The embedded headers contain source and dest in reverse order */
d4383f04 968 cp = pp->conn_out_get(AF_INET6, skb, &ciph, 1);
2a3b791e
JV
969 if (!cp)
970 return NF_ACCEPT;
971
63dca2c0
JDB
972 snet.in6 = ciph.saddr.in6;
973 writable = ciph.len;
974 return handle_response_icmp(AF_INET6, skb, &snet, ciph.protocol, cp,
975 pp, writable, sizeof(struct ipv6hdr));
2a3b791e
JV
976}
977#endif
978
2906f66a
VMR
979/*
980 * Check if sctp chunc is ABORT chunk
981 */
982static inline int is_sctp_abort(const struct sk_buff *skb, int nh_len)
983{
984 sctp_chunkhdr_t *sch, schunk;
985 sch = skb_header_pointer(skb, nh_len + sizeof(sctp_sctphdr_t),
986 sizeof(schunk), &schunk);
987 if (sch == NULL)
988 return 0;
989 if (sch->type == SCTP_CID_ABORT)
990 return 1;
991 return 0;
992}
993
2a3b791e 994static inline int is_tcp_reset(const struct sk_buff *skb, int nh_len)
1da177e4
LT
995{
996 struct tcphdr _tcph, *th;
997
2a3b791e 998 th = skb_header_pointer(skb, nh_len, sizeof(_tcph), &_tcph);
1da177e4
LT
999 if (th == NULL)
1000 return 0;
1001 return th->rst;
1002}
1003
4856c84c 1004/* Handle response packets: rewrite addresses and send away...
4856c84c
MT
1005 */
1006static unsigned int
9330419d 1007handle_response(int af, struct sk_buff *skb, struct ip_vs_proto_data *pd,
d4383f04 1008 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph)
4856c84c 1009{
9330419d
HS
1010 struct ip_vs_protocol *pp = pd->pp;
1011
0d79641a 1012 IP_VS_DBG_PKT(11, af, pp, skb, 0, "Outgoing packet");
4856c84c 1013
d4383f04 1014 if (!skb_make_writable(skb, iph->len))
4856c84c
MT
1015 goto drop;
1016
1017 /* mangle the packet */
d4383f04 1018 if (pp->snat_handler && !pp->snat_handler(skb, pp, cp, iph))
4856c84c
MT
1019 goto drop;
1020
1021#ifdef CONFIG_IP_VS_IPV6
1022 if (af == AF_INET6)
1023 ipv6_hdr(skb)->saddr = cp->vaddr.in6;
1024 else
1025#endif
1026 {
1027 ip_hdr(skb)->saddr = cp->vaddr.ip;
1028 ip_send_check(ip_hdr(skb));
1029 }
1030
8a803040
JA
1031 /*
1032 * nf_iterate does not expect change in the skb->dst->dev.
1033 * It looks like it is not fatal to enable this code for hooks
1034 * where our handlers are at the end of the chain list and
1035 * when all next handlers use skb->dst->dev and not outdev.
1036 * It will definitely route properly the inout NAT traffic
1037 * when multiple paths are used.
1038 */
1039
4856c84c
MT
1040 /* For policy routing, packets originating from this
1041 * machine itself may be routed differently to packets
1042 * passing through. We want this packet to be routed as
1043 * if it came from this machine itself. So re-compute
1044 * the routing information.
1045 */
ba4fd7e9
SH
1046 if (ip_vs_route_me_harder(af, skb))
1047 goto drop;
4856c84c 1048
0d79641a 1049 IP_VS_DBG_PKT(10, af, pp, skb, 0, "After SNAT");
4856c84c
MT
1050
1051 ip_vs_out_stats(cp, skb);
9330419d 1052 ip_vs_set_state(cp, IP_VS_DIR_OUTPUT, skb, pd);
cf356d69 1053 skb->ipvs_property = 1;
f4bc17cd 1054 if (!(cp->flags & IP_VS_CONN_F_NFCT))
cf356d69 1055 ip_vs_notrack(skb);
f4bc17cd
JA
1056 else
1057 ip_vs_update_conntrack(skb, cp, 0);
4856c84c
MT
1058 ip_vs_conn_put(cp);
1059
4856c84c
MT
1060 LeaveFunction(11);
1061 return NF_ACCEPT;
1062
1063drop:
1064 ip_vs_conn_put(cp);
1065 kfree_skb(skb);
f4bc17cd 1066 LeaveFunction(11);
4856c84c
MT
1067 return NF_STOLEN;
1068}
1069
1da177e4 1070/*
4856c84c 1071 * Check if outgoing packet belongs to the established ip_vs_conn.
1da177e4
LT
1072 */
1073static unsigned int
fc604767 1074ip_vs_out(unsigned int hooknum, struct sk_buff *skb, int af)
1da177e4 1075{
fc723250 1076 struct net *net = NULL;
51ef348b 1077 struct ip_vs_iphdr iph;
1da177e4 1078 struct ip_vs_protocol *pp;
9330419d 1079 struct ip_vs_proto_data *pd;
1da177e4 1080 struct ip_vs_conn *cp;
1da177e4
LT
1081
1082 EnterFunction(11);
1083
fc604767 1084 /* Already marked as IPVS request or reply? */
6869c4d8 1085 if (skb->ipvs_property)
1da177e4
LT
1086 return NF_ACCEPT;
1087
fc604767
JA
1088 /* Bad... Do not break raw sockets */
1089 if (unlikely(skb->sk != NULL && hooknum == NF_INET_LOCAL_OUT &&
1090 af == AF_INET)) {
1091 struct sock *sk = skb->sk;
1092 struct inet_sock *inet = inet_sk(skb->sk);
1093
1094 if (inet && sk->sk_family == PF_INET && inet->nodefrag)
1095 return NF_ACCEPT;
1096 }
1097
1098 if (unlikely(!skb_dst(skb)))
1099 return NF_ACCEPT;
1100
fc723250 1101 net = skb_net(skb);
7a4f0761
HS
1102 if (!net_ipvs(net)->enable)
1103 return NF_ACCEPT;
1104
63dca2c0 1105 ip_vs_fill_iph_skb(af, skb, &iph);
2a3b791e
JV
1106#ifdef CONFIG_IP_VS_IPV6
1107 if (af == AF_INET6) {
2f74713d
JDB
1108 if (!iph.fragoffs && skb_nfct_reasm(skb)) {
1109 struct sk_buff *reasm = skb_nfct_reasm(skb);
1110 /* Save fw mark for coming frags */
1111 reasm->ipvs_property = 1;
1112 reasm->mark = skb->mark;
1113 }
2a3b791e 1114 if (unlikely(iph.protocol == IPPROTO_ICMPV6)) {
1ca5bb54
JA
1115 int related;
1116 int verdict = ip_vs_out_icmp_v6(skb, &related,
d4383f04 1117 hooknum, &iph);
1da177e4 1118
f5a41847 1119 if (related)
2a3b791e 1120 return verdict;
2a3b791e
JV
1121 }
1122 } else
1123#endif
1124 if (unlikely(iph.protocol == IPPROTO_ICMP)) {
1ca5bb54
JA
1125 int related;
1126 int verdict = ip_vs_out_icmp(skb, &related, hooknum);
2a3b791e 1127
f5a41847 1128 if (related)
2a3b791e 1129 return verdict;
2a3b791e 1130 }
1da177e4 1131
9330419d
HS
1132 pd = ip_vs_proto_data_get(net, iph.protocol);
1133 if (unlikely(!pd))
1da177e4 1134 return NF_ACCEPT;
9330419d 1135 pp = pd->pp;
1da177e4
LT
1136
1137 /* reassemble IP fragments */
2a3b791e 1138#ifdef CONFIG_IP_VS_IPV6
63dca2c0 1139 if (af == AF_INET)
2a3b791e 1140#endif
56f8a75c 1141 if (unlikely(ip_is_fragment(ip_hdr(skb)) && !pp->dont_defrag)) {
1ca5bb54
JA
1142 if (ip_vs_gather_frags(skb,
1143 ip_vs_defrag_user(hooknum)))
2a3b791e
JV
1144 return NF_STOLEN;
1145
63dca2c0 1146 ip_vs_fill_ip4hdr(skb_network_header(skb), &iph);
2a3b791e 1147 }
1da177e4
LT
1148
1149 /*
1150 * Check if the packet belongs to an existing entry
1151 */
d4383f04 1152 cp = pp->conn_out_get(af, skb, &iph, 0);
1da177e4 1153
cb59155f 1154 if (likely(cp))
d4383f04 1155 return handle_response(af, skb, pd, cp, &iph);
0cfa558e 1156 if (sysctl_nat_icmp_send(net) &&
cb59155f
JA
1157 (pp->protocol == IPPROTO_TCP ||
1158 pp->protocol == IPPROTO_UDP ||
1159 pp->protocol == IPPROTO_SCTP)) {
1160 __be16 _ports[2], *pptr;
1161
2f74713d
JDB
1162 pptr = frag_safe_skb_hp(skb, iph.len,
1163 sizeof(_ports), _ports, &iph);
cb59155f
JA
1164 if (pptr == NULL)
1165 return NF_ACCEPT; /* Not for me */
276472ea
JA
1166 if (ip_vs_has_real_service(net, af, iph.protocol, &iph.saddr,
1167 pptr[0])) {
cb59155f
JA
1168 /*
1169 * Notify the real server: there is no
1170 * existing entry if it is not RST
1171 * packet or not TCP packet.
1172 */
1173 if ((iph.protocol != IPPROTO_TCP &&
1174 iph.protocol != IPPROTO_SCTP)
1175 || ((iph.protocol == IPPROTO_TCP
1176 && !is_tcp_reset(skb, iph.len))
1177 || (iph.protocol == IPPROTO_SCTP
1178 && !is_sctp_abort(skb,
1179 iph.len)))) {
2a3b791e 1180#ifdef CONFIG_IP_VS_IPV6
cb59155f 1181 if (af == AF_INET6) {
cb59155f
JA
1182 if (!skb->dev)
1183 skb->dev = net->loopback_dev;
1184 icmpv6_send(skb,
1185 ICMPV6_DEST_UNREACH,
1186 ICMPV6_PORT_UNREACH,
1187 0);
1188 } else
2a3b791e 1189#endif
cb59155f
JA
1190 icmp_send(skb,
1191 ICMP_DEST_UNREACH,
1192 ICMP_PORT_UNREACH, 0);
1193 return NF_DROP;
1da177e4
LT
1194 }
1195 }
1da177e4 1196 }
0d79641a 1197 IP_VS_DBG_PKT(12, af, pp, skb, 0,
cb59155f
JA
1198 "ip_vs_out: packet continues traversal as normal");
1199 return NF_ACCEPT;
1da177e4
LT
1200}
1201
fc604767 1202/*
cb59155f
JA
1203 * It is hooked at the NF_INET_FORWARD and NF_INET_LOCAL_IN chain,
1204 * used only for VS/NAT.
fc604767
JA
1205 * Check if packet is reply for established ip_vs_conn.
1206 */
1207static unsigned int
1208ip_vs_reply4(unsigned int hooknum, struct sk_buff *skb,
1209 const struct net_device *in, const struct net_device *out,
1210 int (*okfn)(struct sk_buff *))
1211{
1212 return ip_vs_out(hooknum, skb, AF_INET);
1213}
1214
1215/*
1216 * It is hooked at the NF_INET_LOCAL_OUT chain, used only for VS/NAT.
1217 * Check if packet is reply for established ip_vs_conn.
1218 */
1219static unsigned int
1220ip_vs_local_reply4(unsigned int hooknum, struct sk_buff *skb,
1221 const struct net_device *in, const struct net_device *out,
1222 int (*okfn)(struct sk_buff *))
1223{
ac69269a 1224 return ip_vs_out(hooknum, skb, AF_INET);
fc604767
JA
1225}
1226
1227#ifdef CONFIG_IP_VS_IPV6
1228
1229/*
cb59155f
JA
1230 * It is hooked at the NF_INET_FORWARD and NF_INET_LOCAL_IN chain,
1231 * used only for VS/NAT.
fc604767
JA
1232 * Check if packet is reply for established ip_vs_conn.
1233 */
1234static unsigned int
1235ip_vs_reply6(unsigned int hooknum, struct sk_buff *skb,
1236 const struct net_device *in, const struct net_device *out,
1237 int (*okfn)(struct sk_buff *))
1238{
1239 return ip_vs_out(hooknum, skb, AF_INET6);
1240}
1241
1242/*
1243 * It is hooked at the NF_INET_LOCAL_OUT chain, used only for VS/NAT.
1244 * Check if packet is reply for established ip_vs_conn.
1245 */
1246static unsigned int
1247ip_vs_local_reply6(unsigned int hooknum, struct sk_buff *skb,
1248 const struct net_device *in, const struct net_device *out,
1249 int (*okfn)(struct sk_buff *))
1250{
ac69269a 1251 return ip_vs_out(hooknum, skb, AF_INET6);
fc604767
JA
1252}
1253
1254#endif
1da177e4
LT
1255
1256/*
1257 * Handle ICMP messages in the outside-to-inside direction (incoming).
1258 * Find any that might be relevant, check against existing connections,
1259 * forward to the right destination host if relevant.
1260 * Currently handles error types - unreachable, quench, ttl exceeded.
1261 */
e905a9ed 1262static int
3db05fea 1263ip_vs_in_icmp(struct sk_buff *skb, int *related, unsigned int hooknum)
1da177e4 1264{
9330419d 1265 struct net *net = NULL;
1da177e4
LT
1266 struct iphdr *iph;
1267 struct icmphdr _icmph, *ic;
1268 struct iphdr _ciph, *cih; /* The ip header contained within the ICMP */
51ef348b 1269 struct ip_vs_iphdr ciph;
1da177e4
LT
1270 struct ip_vs_conn *cp;
1271 struct ip_vs_protocol *pp;
9330419d 1272 struct ip_vs_proto_data *pd;
f2edb9f7
JA
1273 unsigned int offset, offset2, ihl, verdict;
1274 bool ipip;
1da177e4
LT
1275
1276 *related = 1;
1277
1278 /* reassemble IP fragments */
56f8a75c 1279 if (ip_is_fragment(ip_hdr(skb))) {
1ca5bb54 1280 if (ip_vs_gather_frags(skb, ip_vs_defrag_user(hooknum)))
1da177e4 1281 return NF_STOLEN;
1da177e4
LT
1282 }
1283
eddc9ec5 1284 iph = ip_hdr(skb);
1da177e4
LT
1285 offset = ihl = iph->ihl * 4;
1286 ic = skb_header_pointer(skb, offset, sizeof(_icmph), &_icmph);
1287 if (ic == NULL)
1288 return NF_DROP;
1289
14d5e834 1290 IP_VS_DBG(12, "Incoming ICMP (%d,%d) %pI4->%pI4\n",
1da177e4 1291 ic->type, ntohs(icmp_id(ic)),
14d5e834 1292 &iph->saddr, &iph->daddr);
1da177e4
LT
1293
1294 /*
1295 * Work through seeing if this is for us.
1296 * These checks are supposed to be in an order that means easy
1297 * things are checked first to speed up processing.... however
1298 * this means that some packets will manage to get a long way
1299 * down this stack and then be rejected, but that's life.
1300 */
1301 if ((ic->type != ICMP_DEST_UNREACH) &&
1302 (ic->type != ICMP_SOURCE_QUENCH) &&
1303 (ic->type != ICMP_TIME_EXCEEDED)) {
1304 *related = 0;
1305 return NF_ACCEPT;
1306 }
1307
1308 /* Now find the contained IP header */
1309 offset += sizeof(_icmph);
1310 cih = skb_header_pointer(skb, offset, sizeof(_ciph), &_ciph);
1311 if (cih == NULL)
1312 return NF_ACCEPT; /* The packet looks wrong, ignore */
1313
9330419d 1314 net = skb_net(skb);
7a4f0761 1315
f2edb9f7
JA
1316 /* Special case for errors for IPIP packets */
1317 ipip = false;
1318 if (cih->protocol == IPPROTO_IPIP) {
1319 if (unlikely(cih->frag_off & htons(IP_OFFSET)))
1320 return NF_ACCEPT;
1321 /* Error for our IPIP must arrive at LOCAL_IN */
1322 if (!(skb_rtable(skb)->rt_flags & RTCF_LOCAL))
1323 return NF_ACCEPT;
1324 offset += cih->ihl * 4;
1325 cih = skb_header_pointer(skb, offset, sizeof(_ciph), &_ciph);
1326 if (cih == NULL)
1327 return NF_ACCEPT; /* The packet looks wrong, ignore */
1328 ipip = true;
1329 }
1330
9330419d
HS
1331 pd = ip_vs_proto_data_get(net, cih->protocol);
1332 if (!pd)
1da177e4 1333 return NF_ACCEPT;
9330419d 1334 pp = pd->pp;
1da177e4
LT
1335
1336 /* Is the embedded protocol header present? */
4412ec49 1337 if (unlikely(cih->frag_off & htons(IP_OFFSET) &&
1da177e4
LT
1338 pp->dont_defrag))
1339 return NF_ACCEPT;
1340
0d79641a
JA
1341 IP_VS_DBG_PKT(11, AF_INET, pp, skb, offset,
1342 "Checking incoming ICMP for");
1da177e4 1343
f2edb9f7 1344 offset2 = offset;
63dca2c0
JDB
1345 ip_vs_fill_ip4hdr(cih, &ciph);
1346 ciph.len += offset;
1347 offset = ciph.len;
f2edb9f7
JA
1348 /* The embedded headers contain source and dest in reverse order.
1349 * For IPIP this is error for request, not for reply.
1350 */
d4383f04 1351 cp = pp->conn_in_get(AF_INET, skb, &ciph, ipip ? 0 : 1);
6cb90db5 1352 if (!cp)
1da177e4
LT
1353 return NF_ACCEPT;
1354
1355 verdict = NF_DROP;
1356
1357 /* Ensure the checksum is correct */
60476372 1358 if (!skb_csum_unnecessary(skb) && ip_vs_checksum_complete(skb, ihl)) {
1da177e4 1359 /* Failed checksum! */
14d5e834
HH
1360 IP_VS_DBG(1, "Incoming ICMP: failed checksum from %pI4!\n",
1361 &iph->saddr);
1da177e4
LT
1362 goto out;
1363 }
1364
f2edb9f7
JA
1365 if (ipip) {
1366 __be32 info = ic->un.gateway;
1367
1368 /* Update the MTU */
1369 if (ic->type == ICMP_DEST_UNREACH &&
1370 ic->code == ICMP_FRAG_NEEDED) {
1371 struct ip_vs_dest *dest = cp->dest;
1372 u32 mtu = ntohs(ic->un.frag.mtu);
1373
1374 /* Strip outer IP and ICMP, go to IPIP header */
1375 __skb_pull(skb, ihl + sizeof(_icmph));
1376 offset2 -= ihl + sizeof(_icmph);
1377 skb_reset_network_header(skb);
1378 IP_VS_DBG(12, "ICMP for IPIP %pI4->%pI4: mtu=%u\n",
1379 &ip_hdr(skb)->saddr, &ip_hdr(skb)->daddr, mtu);
f2edb9f7
JA
1380 ipv4_update_pmtu(skb, dev_net(skb->dev),
1381 mtu, 0, 0, 0, 0);
f2edb9f7
JA
1382 /* Client uses PMTUD? */
1383 if (!(cih->frag_off & htons(IP_DF)))
1384 goto ignore_ipip;
1385 /* Prefer the resulting PMTU */
1386 if (dest) {
026ace06
JA
1387 struct ip_vs_dest_dst *dest_dst;
1388
1389 rcu_read_lock();
1390 dest_dst = rcu_dereference(dest->dest_dst);
1391 if (dest_dst)
1392 mtu = dst_mtu(dest_dst->dst_cache);
1393 rcu_read_unlock();
f2edb9f7
JA
1394 }
1395 if (mtu > 68 + sizeof(struct iphdr))
1396 mtu -= sizeof(struct iphdr);
1397 info = htonl(mtu);
1398 }
1399 /* Strip outer IP, ICMP and IPIP, go to IP header of
1400 * original request.
1401 */
1402 __skb_pull(skb, offset2);
1403 skb_reset_network_header(skb);
1404 IP_VS_DBG(12, "Sending ICMP for %pI4->%pI4: t=%u, c=%u, i=%u\n",
1405 &ip_hdr(skb)->saddr, &ip_hdr(skb)->daddr,
1406 ic->type, ic->code, ntohl(info));
1407 icmp_send(skb, ic->type, ic->code, info);
1408 /* ICMP can be shorter but anyways, account it */
1409 ip_vs_out_stats(cp, skb);
1410
1411ignore_ipip:
1412 consume_skb(skb);
1413 verdict = NF_STOLEN;
1414 goto out;
1415 }
1416
1da177e4
LT
1417 /* do the statistics and put it back */
1418 ip_vs_in_stats(cp, skb);
1419 if (IPPROTO_TCP == cih->protocol || IPPROTO_UDP == cih->protocol)
1420 offset += 2 * sizeof(__u16);
d4383f04 1421 verdict = ip_vs_icmp_xmit(skb, cp, pp, offset, hooknum, &ciph);
1da177e4 1422
552ad65a 1423out:
1da177e4
LT
1424 __ip_vs_conn_put(cp);
1425
1426 return verdict;
1427}
1428
2a3b791e 1429#ifdef CONFIG_IP_VS_IPV6
d4383f04
JDB
1430static int ip_vs_in_icmp_v6(struct sk_buff *skb, int *related,
1431 unsigned int hooknum, struct ip_vs_iphdr *iph)
2a3b791e 1432{
9330419d 1433 struct net *net = NULL;
63dca2c0 1434 struct ipv6hdr _ip6h, *ip6h;
2a3b791e 1435 struct icmp6hdr _icmph, *ic;
63dca2c0 1436 struct ip_vs_iphdr ciph = {.flags = 0, .fragoffs = 0};/*Contained IP */
2a3b791e
JV
1437 struct ip_vs_conn *cp;
1438 struct ip_vs_protocol *pp;
9330419d 1439 struct ip_vs_proto_data *pd;
63dca2c0 1440 unsigned int offs_ciph, writable, verdict;
2a3b791e 1441
63dca2c0 1442 *related = 1;
2a3b791e 1443
2f74713d 1444 ic = frag_safe_skb_hp(skb, iph->len, sizeof(_icmph), &_icmph, iph);
2a3b791e
JV
1445 if (ic == NULL)
1446 return NF_DROP;
1447
2a3b791e
JV
1448 /*
1449 * Work through seeing if this is for us.
1450 * These checks are supposed to be in an order that means easy
1451 * things are checked first to speed up processing.... however
1452 * this means that some packets will manage to get a long way
1453 * down this stack and then be rejected, but that's life.
1454 */
2fab8917 1455 if (ic->icmp6_type & ICMPV6_INFOMSG_MASK) {
2a3b791e
JV
1456 *related = 0;
1457 return NF_ACCEPT;
1458 }
2f74713d
JDB
1459 /* Fragment header that is before ICMP header tells us that:
1460 * it's not an error message since they can't be fragmented.
1461 */
e7165030 1462 if (iph->flags & IP6_FH_F_FRAG)
2f74713d 1463 return NF_DROP;
2a3b791e 1464
63dca2c0
JDB
1465 IP_VS_DBG(8, "Incoming ICMPv6 (%d,%d) %pI6c->%pI6c\n",
1466 ic->icmp6_type, ntohs(icmpv6_id(ic)),
1467 &iph->saddr, &iph->daddr);
1468
2a3b791e 1469 /* Now find the contained IP header */
63dca2c0
JDB
1470 ciph.len = iph->len + sizeof(_icmph);
1471 offs_ciph = ciph.len; /* Save ip header offset */
1472 ip6h = skb_header_pointer(skb, ciph.len, sizeof(_ip6h), &_ip6h);
1473 if (ip6h == NULL)
2a3b791e 1474 return NF_ACCEPT; /* The packet looks wrong, ignore */
63dca2c0
JDB
1475 ciph.saddr.in6 = ip6h->saddr; /* conn_in_get() handles reverse order */
1476 ciph.daddr.in6 = ip6h->daddr;
1477 /* skip possible IPv6 exthdrs of contained IPv6 packet */
1478 ciph.protocol = ipv6_find_hdr(skb, &ciph.len, -1, &ciph.fragoffs, NULL);
1479 if (ciph.protocol < 0)
1480 return NF_ACCEPT; /* Contained IPv6 hdr looks wrong, ignore */
2a3b791e 1481
9330419d 1482 net = skb_net(skb);
63dca2c0 1483 pd = ip_vs_proto_data_get(net, ciph.protocol);
9330419d 1484 if (!pd)
2a3b791e 1485 return NF_ACCEPT;
9330419d 1486 pp = pd->pp;
2a3b791e 1487
63dca2c0
JDB
1488 /* Cannot handle fragmented embedded protocol */
1489 if (ciph.fragoffs)
2a3b791e
JV
1490 return NF_ACCEPT;
1491
63dca2c0 1492 IP_VS_DBG_PKT(11, AF_INET6, pp, skb, offs_ciph,
0d79641a 1493 "Checking incoming ICMPv6 for");
2a3b791e 1494
2f74713d
JDB
1495 /* The embedded headers contain source and dest in reverse order
1496 * if not from localhost
1497 */
d4383f04 1498 cp = pp->conn_in_get(AF_INET6, skb, &ciph,
2f74713d
JDB
1499 (hooknum == NF_INET_LOCAL_OUT) ? 0 : 1);
1500
6cb90db5 1501 if (!cp)
2a3b791e 1502 return NF_ACCEPT;
2f74713d
JDB
1503 /* VS/TUN, VS/DR and LOCALNODE just let it go */
1504 if ((hooknum == NF_INET_LOCAL_OUT) &&
1505 (IP_VS_FWD_METHOD(cp) != IP_VS_CONN_F_MASQ)) {
1506 __ip_vs_conn_put(cp);
1507 return NF_ACCEPT;
1508 }
2a3b791e 1509
2a3b791e
JV
1510 /* do the statistics and put it back */
1511 ip_vs_in_stats(cp, skb);
63dca2c0
JDB
1512
1513 /* Need to mangle contained IPv6 header in ICMPv6 packet */
1514 writable = ciph.len;
1515 if (IPPROTO_TCP == ciph.protocol || IPPROTO_UDP == ciph.protocol ||
1516 IPPROTO_SCTP == ciph.protocol)
1517 writable += 2 * sizeof(__u16); /* Also mangle ports */
1518
d4383f04 1519 verdict = ip_vs_icmp_xmit_v6(skb, cp, pp, writable, hooknum, &ciph);
2a3b791e
JV
1520
1521 __ip_vs_conn_put(cp);
1522
1523 return verdict;
1524}
1525#endif
1526
1527
1da177e4
LT
1528/*
1529 * Check if it's for virtual services, look it up,
1530 * and send it on its way...
1531 */
1532static unsigned int
cb59155f 1533ip_vs_in(unsigned int hooknum, struct sk_buff *skb, int af)
1da177e4 1534{
f131315f 1535 struct net *net;
51ef348b 1536 struct ip_vs_iphdr iph;
1da177e4 1537 struct ip_vs_protocol *pp;
9330419d 1538 struct ip_vs_proto_data *pd;
1da177e4 1539 struct ip_vs_conn *cp;
4a516f11 1540 int ret, pkts;
f131315f 1541 struct netns_ipvs *ipvs;
2a3b791e 1542
fc604767
JA
1543 /* Already marked as IPVS request or reply? */
1544 if (skb->ipvs_property)
1545 return NF_ACCEPT;
1546
1da177e4 1547 /*
cb59155f
JA
1548 * Big tappo:
1549 * - remote client: only PACKET_HOST
1550 * - route: used for struct net when skb->dev is unset
1da177e4 1551 */
cb59155f
JA
1552 if (unlikely((skb->pkt_type != PACKET_HOST &&
1553 hooknum != NF_INET_LOCAL_OUT) ||
1554 !skb_dst(skb))) {
63dca2c0 1555 ip_vs_fill_iph_skb(af, skb, &iph);
cb59155f
JA
1556 IP_VS_DBG_BUF(12, "packet type=%d proto=%d daddr=%s"
1557 " ignored in hook %u\n",
1558 skb->pkt_type, iph.protocol,
1559 IP_VS_DBG_ADDR(af, &iph.daddr), hooknum);
1da177e4
LT
1560 return NF_ACCEPT;
1561 }
7a4f0761
HS
1562 /* ipvs enabled in this netns ? */
1563 net = skb_net(skb);
0c12582f
JA
1564 ipvs = net_ipvs(net);
1565 if (unlikely(sysctl_backup_only(ipvs) || !ipvs->enable))
7a4f0761
HS
1566 return NF_ACCEPT;
1567
63dca2c0 1568 ip_vs_fill_iph_skb(af, skb, &iph);
cb59155f
JA
1569
1570 /* Bad... Do not break raw sockets */
1571 if (unlikely(skb->sk != NULL && hooknum == NF_INET_LOCAL_OUT &&
1572 af == AF_INET)) {
1573 struct sock *sk = skb->sk;
1574 struct inet_sock *inet = inet_sk(skb->sk);
1575
1576 if (inet && sk->sk_family == PF_INET && inet->nodefrag)
1577 return NF_ACCEPT;
1578 }
1da177e4 1579
94b26551
JV
1580#ifdef CONFIG_IP_VS_IPV6
1581 if (af == AF_INET6) {
2f74713d
JDB
1582 if (!iph.fragoffs && skb_nfct_reasm(skb)) {
1583 struct sk_buff *reasm = skb_nfct_reasm(skb);
1584 /* Save fw mark for coming frags. */
1585 reasm->ipvs_property = 1;
1586 reasm->mark = skb->mark;
1587 }
94b26551 1588 if (unlikely(iph.protocol == IPPROTO_ICMPV6)) {
1ca5bb54 1589 int related;
d4383f04
JDB
1590 int verdict = ip_vs_in_icmp_v6(skb, &related, hooknum,
1591 &iph);
1da177e4 1592
94b26551
JV
1593 if (related)
1594 return verdict;
94b26551
JV
1595 }
1596 } else
1597#endif
1598 if (unlikely(iph.protocol == IPPROTO_ICMP)) {
1ca5bb54
JA
1599 int related;
1600 int verdict = ip_vs_in_icmp(skb, &related, hooknum);
94b26551
JV
1601
1602 if (related)
1603 return verdict;
94b26551 1604 }
1da177e4
LT
1605
1606 /* Protocol supported? */
9330419d
HS
1607 pd = ip_vs_proto_data_get(net, iph.protocol);
1608 if (unlikely(!pd))
1da177e4 1609 return NF_ACCEPT;
9330419d 1610 pp = pd->pp;
1da177e4
LT
1611 /*
1612 * Check if the packet belongs to an existing connection entry
1613 */
d4383f04 1614 cp = pp->conn_in_get(af, skb, &iph, 0);
63dca2c0 1615 if (unlikely(!cp) && !iph.fragoffs) {
2f74713d
JDB
1616 /* No (second) fragments need to enter here, as nf_defrag_ipv6
1617 * replayed fragment zero will already have created the cp
1618 */
1da177e4
LT
1619 int v;
1620
2f74713d 1621 /* Schedule and create new connection entry into &cp */
d4383f04 1622 if (!pp->conn_schedule(af, skb, pd, &v, &cp, &iph))
1da177e4
LT
1623 return v;
1624 }
1625
1626 if (unlikely(!cp)) {
1627 /* sorry, all this trouble for a no-hit :) */
0d79641a 1628 IP_VS_DBG_PKT(12, af, pp, skb, 0,
cb59155f 1629 "ip_vs_in: packet continues traversal as normal");
2f74713d
JDB
1630 if (iph.fragoffs && !skb_nfct_reasm(skb)) {
1631 /* Fragment that couldn't be mapped to a conn entry
1632 * and don't have any pointer to a reasm skb
1633 * is missing module nf_defrag_ipv6
1634 */
1635 IP_VS_DBG_RL("Unhandled frag, load nf_defrag_ipv6\n");
1636 IP_VS_DBG_PKT(7, af, pp, skb, 0, "unhandled fragment");
1637 }
1da177e4
LT
1638 return NF_ACCEPT;
1639 }
1640
0d79641a 1641 IP_VS_DBG_PKT(11, af, pp, skb, 0, "Incoming packet");
1da177e4
LT
1642 /* Check the server status */
1643 if (cp->dest && !(cp->dest->flags & IP_VS_DEST_F_AVAILABLE)) {
1644 /* the destination server is not available */
1645
71a8ab6c 1646 if (sysctl_expire_nodest_conn(ipvs)) {
1da177e4
LT
1647 /* try to expire the connection immediately */
1648 ip_vs_conn_expire_now(cp);
1da177e4 1649 }
dc8103f2
JA
1650 /* don't restart its timer, and silently
1651 drop the packet. */
1652 __ip_vs_conn_put(cp);
1da177e4
LT
1653 return NF_DROP;
1654 }
1655
1656 ip_vs_in_stats(cp, skb);
4a516f11 1657 ip_vs_set_state(cp, IP_VS_DIR_INPUT, skb, pd);
1da177e4 1658 if (cp->packet_xmit)
d4383f04 1659 ret = cp->packet_xmit(skb, cp, pp, &iph);
1da177e4
LT
1660 /* do not touch skb anymore */
1661 else {
1662 IP_VS_DBG_RL("warning: packet_xmit is null");
1663 ret = NF_ACCEPT;
1664 }
1665
efac5276
RB
1666 /* Increase its packet counter and check if it is needed
1667 * to be synchronized
1668 *
1669 * Sync connection if it is about to close to
1670 * encorage the standby servers to update the connections timeout
986a0757
HS
1671 *
1672 * For ONE_PKT let ip_vs_sync_conn() do the filter work.
efac5276 1673 */
f131315f 1674
986a0757 1675 if (cp->flags & IP_VS_CONN_F_ONE_PACKET)
59e0350e 1676 pkts = sysctl_sync_threshold(ipvs);
986a0757
HS
1677 else
1678 pkts = atomic_add_return(1, &cp->in_pkts);
1679
749c42b6
JA
1680 if (ipvs->sync_state & IP_VS_STATE_MASTER)
1681 ip_vs_sync_conn(net, cp, pkts);
1da177e4
LT
1682
1683 ip_vs_conn_put(cp);
1684 return ret;
1685}
1686
cb59155f
JA
1687/*
1688 * AF_INET handler in NF_INET_LOCAL_IN chain
1689 * Schedule and forward packets from remote clients
1690 */
1691static unsigned int
1692ip_vs_remote_request4(unsigned int hooknum, struct sk_buff *skb,
1693 const struct net_device *in,
1694 const struct net_device *out,
1695 int (*okfn)(struct sk_buff *))
1696{
1697 return ip_vs_in(hooknum, skb, AF_INET);
1698}
1699
1700/*
1701 * AF_INET handler in NF_INET_LOCAL_OUT chain
1702 * Schedule and forward packets from local clients
1703 */
1704static unsigned int
1705ip_vs_local_request4(unsigned int hooknum, struct sk_buff *skb,
1706 const struct net_device *in, const struct net_device *out,
1707 int (*okfn)(struct sk_buff *))
1708{
ac69269a 1709 return ip_vs_in(hooknum, skb, AF_INET);
cb59155f
JA
1710}
1711
1712#ifdef CONFIG_IP_VS_IPV6
1713
2f74713d
JDB
1714/*
1715 * AF_INET6 fragment handling
1716 * Copy info from first fragment, to the rest of them.
1717 */
1718static unsigned int
1719ip_vs_preroute_frag6(unsigned int hooknum, struct sk_buff *skb,
1720 const struct net_device *in,
1721 const struct net_device *out,
1722 int (*okfn)(struct sk_buff *))
1723{
1724 struct sk_buff *reasm = skb_nfct_reasm(skb);
1725 struct net *net;
1726
1727 /* Skip if not a "replay" from nf_ct_frag6_output or first fragment.
1728 * ipvs_property is set when checking first fragment
1729 * in ip_vs_in() and ip_vs_out().
1730 */
1731 if (reasm)
1732 IP_VS_DBG(2, "Fragment recv prop:%d\n", reasm->ipvs_property);
1733 if (!reasm || !reasm->ipvs_property)
1734 return NF_ACCEPT;
1735
1736 net = skb_net(skb);
1737 if (!net_ipvs(net)->enable)
1738 return NF_ACCEPT;
1739
1740 /* Copy stored fw mark, saved in ip_vs_{in,out} */
1741 skb->mark = reasm->mark;
1742
1743 return NF_ACCEPT;
1744}
1745
cb59155f
JA
1746/*
1747 * AF_INET6 handler in NF_INET_LOCAL_IN chain
1748 * Schedule and forward packets from remote clients
1749 */
1750static unsigned int
1751ip_vs_remote_request6(unsigned int hooknum, struct sk_buff *skb,
1752 const struct net_device *in,
1753 const struct net_device *out,
1754 int (*okfn)(struct sk_buff *))
1755{
1756 return ip_vs_in(hooknum, skb, AF_INET6);
1757}
1758
1759/*
1760 * AF_INET6 handler in NF_INET_LOCAL_OUT chain
1761 * Schedule and forward packets from local clients
1762 */
1763static unsigned int
1764ip_vs_local_request6(unsigned int hooknum, struct sk_buff *skb,
1765 const struct net_device *in, const struct net_device *out,
1766 int (*okfn)(struct sk_buff *))
1767{
ac69269a 1768 return ip_vs_in(hooknum, skb, AF_INET6);
cb59155f
JA
1769}
1770
1771#endif
1772
1da177e4
LT
1773
1774/*
6e23ae2a 1775 * It is hooked at the NF_INET_FORWARD chain, in order to catch ICMP
1da177e4
LT
1776 * related packets destined for 0.0.0.0/0.
1777 * When fwmark-based virtual service is used, such as transparent
1778 * cache cluster, TCP packets can be marked and routed to ip_vs_in,
1779 * but ICMP destined for 0.0.0.0/0 cannot not be easily marked and
6e23ae2a 1780 * sent to ip_vs_in_icmp. So, catch them at the NF_INET_FORWARD chain
1da177e4
LT
1781 * and send them to ip_vs_in_icmp.
1782 */
1783static unsigned int
3db05fea 1784ip_vs_forward_icmp(unsigned int hooknum, struct sk_buff *skb,
1da177e4
LT
1785 const struct net_device *in, const struct net_device *out,
1786 int (*okfn)(struct sk_buff *))
1787{
1788 int r;
7a4f0761 1789 struct net *net;
0c12582f 1790 struct netns_ipvs *ipvs;
1da177e4 1791
3db05fea 1792 if (ip_hdr(skb)->protocol != IPPROTO_ICMP)
1da177e4
LT
1793 return NF_ACCEPT;
1794
7a4f0761
HS
1795 /* ipvs enabled in this netns ? */
1796 net = skb_net(skb);
0c12582f
JA
1797 ipvs = net_ipvs(net);
1798 if (unlikely(sysctl_backup_only(ipvs) || !ipvs->enable))
7a4f0761
HS
1799 return NF_ACCEPT;
1800
3db05fea 1801 return ip_vs_in_icmp(skb, &r, hooknum);
1da177e4
LT
1802}
1803
2a3b791e
JV
1804#ifdef CONFIG_IP_VS_IPV6
1805static unsigned int
1806ip_vs_forward_icmp_v6(unsigned int hooknum, struct sk_buff *skb,
1807 const struct net_device *in, const struct net_device *out,
1808 int (*okfn)(struct sk_buff *))
1809{
1810 int r;
7a4f0761 1811 struct net *net;
0c12582f 1812 struct netns_ipvs *ipvs;
63dca2c0 1813 struct ip_vs_iphdr iphdr;
2a3b791e 1814
63dca2c0
JDB
1815 ip_vs_fill_iph_skb(AF_INET6, skb, &iphdr);
1816 if (iphdr.protocol != IPPROTO_ICMPV6)
2a3b791e
JV
1817 return NF_ACCEPT;
1818
7a4f0761
HS
1819 /* ipvs enabled in this netns ? */
1820 net = skb_net(skb);
0c12582f
JA
1821 ipvs = net_ipvs(net);
1822 if (unlikely(sysctl_backup_only(ipvs) || !ipvs->enable))
7a4f0761
HS
1823 return NF_ACCEPT;
1824
d4383f04 1825 return ip_vs_in_icmp_v6(skb, &r, hooknum, &iphdr);
2a3b791e
JV
1826}
1827#endif
1828
1da177e4 1829
1999414a 1830static struct nf_hook_ops ip_vs_ops[] __read_mostly = {
cb59155f
JA
1831 /* After packet filtering, change source only for VS/NAT */
1832 {
1833 .hook = ip_vs_reply4,
1834 .owner = THIS_MODULE,
4c809d63 1835 .pf = NFPROTO_IPV4,
cb59155f 1836 .hooknum = NF_INET_LOCAL_IN,
afb523c5 1837 .priority = NF_IP_PRI_NAT_SRC - 2,
cb59155f 1838 },
41c5b317
PM
1839 /* After packet filtering, forward packet through VS/DR, VS/TUN,
1840 * or VS/NAT(change destination), so that filtering rules can be
1841 * applied to IPVS. */
1842 {
cb59155f 1843 .hook = ip_vs_remote_request4,
41c5b317 1844 .owner = THIS_MODULE,
4c809d63 1845 .pf = NFPROTO_IPV4,
cb59155f 1846 .hooknum = NF_INET_LOCAL_IN,
afb523c5 1847 .priority = NF_IP_PRI_NAT_SRC - 1,
41c5b317 1848 },
fc604767 1849 /* Before ip_vs_in, change source only for VS/NAT */
41c5b317 1850 {
fc604767 1851 .hook = ip_vs_local_reply4,
41c5b317 1852 .owner = THIS_MODULE,
4c809d63 1853 .pf = NFPROTO_IPV4,
fc604767 1854 .hooknum = NF_INET_LOCAL_OUT,
afb523c5 1855 .priority = NF_IP_PRI_NAT_DST + 1,
41c5b317 1856 },
cb59155f
JA
1857 /* After mangle, schedule and forward local requests */
1858 {
1859 .hook = ip_vs_local_request4,
1860 .owner = THIS_MODULE,
4c809d63 1861 .pf = NFPROTO_IPV4,
cb59155f 1862 .hooknum = NF_INET_LOCAL_OUT,
afb523c5 1863 .priority = NF_IP_PRI_NAT_DST + 2,
cb59155f 1864 },
41c5b317
PM
1865 /* After packet filtering (but before ip_vs_out_icmp), catch icmp
1866 * destined for 0.0.0.0/0, which is for incoming IPVS connections */
1867 {
1868 .hook = ip_vs_forward_icmp,
1869 .owner = THIS_MODULE,
4c809d63 1870 .pf = NFPROTO_IPV4,
cb59155f
JA
1871 .hooknum = NF_INET_FORWARD,
1872 .priority = 99,
41c5b317 1873 },
fc604767
JA
1874 /* After packet filtering, change source only for VS/NAT */
1875 {
1876 .hook = ip_vs_reply4,
1877 .owner = THIS_MODULE,
4c809d63 1878 .pf = NFPROTO_IPV4,
fc604767
JA
1879 .hooknum = NF_INET_FORWARD,
1880 .priority = 100,
1881 },
473b23d3 1882#ifdef CONFIG_IP_VS_IPV6
2f74713d
JDB
1883 /* After mangle & nat fetch 2:nd fragment and following */
1884 {
1885 .hook = ip_vs_preroute_frag6,
1886 .owner = THIS_MODULE,
1887 .pf = NFPROTO_IPV6,
1888 .hooknum = NF_INET_PRE_ROUTING,
1889 .priority = NF_IP6_PRI_NAT_DST + 1,
1890 },
cb59155f
JA
1891 /* After packet filtering, change source only for VS/NAT */
1892 {
1893 .hook = ip_vs_reply6,
1894 .owner = THIS_MODULE,
4c809d63 1895 .pf = NFPROTO_IPV6,
cb59155f 1896 .hooknum = NF_INET_LOCAL_IN,
afb523c5 1897 .priority = NF_IP6_PRI_NAT_SRC - 2,
cb59155f 1898 },
473b23d3
JV
1899 /* After packet filtering, forward packet through VS/DR, VS/TUN,
1900 * or VS/NAT(change destination), so that filtering rules can be
1901 * applied to IPVS. */
1902 {
cb59155f 1903 .hook = ip_vs_remote_request6,
473b23d3 1904 .owner = THIS_MODULE,
4c809d63 1905 .pf = NFPROTO_IPV6,
cb59155f 1906 .hooknum = NF_INET_LOCAL_IN,
afb523c5 1907 .priority = NF_IP6_PRI_NAT_SRC - 1,
473b23d3 1908 },
fc604767 1909 /* Before ip_vs_in, change source only for VS/NAT */
473b23d3 1910 {
fc604767 1911 .hook = ip_vs_local_reply6,
473b23d3 1912 .owner = THIS_MODULE,
4c809d63 1913 .pf = NFPROTO_IPV4,
fc604767 1914 .hooknum = NF_INET_LOCAL_OUT,
afb523c5 1915 .priority = NF_IP6_PRI_NAT_DST + 1,
473b23d3 1916 },
cb59155f
JA
1917 /* After mangle, schedule and forward local requests */
1918 {
1919 .hook = ip_vs_local_request6,
1920 .owner = THIS_MODULE,
4c809d63 1921 .pf = NFPROTO_IPV6,
cb59155f 1922 .hooknum = NF_INET_LOCAL_OUT,
afb523c5 1923 .priority = NF_IP6_PRI_NAT_DST + 2,
cb59155f 1924 },
473b23d3
JV
1925 /* After packet filtering (but before ip_vs_out_icmp), catch icmp
1926 * destined for 0.0.0.0/0, which is for incoming IPVS connections */
1927 {
1928 .hook = ip_vs_forward_icmp_v6,
1929 .owner = THIS_MODULE,
4c809d63 1930 .pf = NFPROTO_IPV6,
cb59155f
JA
1931 .hooknum = NF_INET_FORWARD,
1932 .priority = 99,
473b23d3 1933 },
fc604767
JA
1934 /* After packet filtering, change source only for VS/NAT */
1935 {
1936 .hook = ip_vs_reply6,
1937 .owner = THIS_MODULE,
4c809d63 1938 .pf = NFPROTO_IPV6,
fc604767
JA
1939 .hooknum = NF_INET_FORWARD,
1940 .priority = 100,
1941 },
473b23d3 1942#endif
1da177e4 1943};
61b1ab45
HS
1944/*
1945 * Initialize IP Virtual Server netns mem.
1946 */
1947static int __net_init __ip_vs_init(struct net *net)
1948{
1949 struct netns_ipvs *ipvs;
1950
61b1ab45 1951 ipvs = net_generic(net, ip_vs_net_id);
0a9ee813 1952 if (ipvs == NULL)
61b1ab45 1953 return -ENOMEM;
0a9ee813 1954
7a4f0761
HS
1955 /* Hold the beast until a service is registerd */
1956 ipvs->enable = 0;
f6340ee0 1957 ipvs->net = net;
61b1ab45
HS
1958 /* Counters used for creating unique names */
1959 ipvs->gen = atomic_read(&ipvs_netns_cnt);
1960 atomic_inc(&ipvs_netns_cnt);
1961 net->ipvs = ipvs;
7a4f0761 1962
503cf15a 1963 if (ip_vs_estimator_net_init(net) < 0)
7a4f0761
HS
1964 goto estimator_fail;
1965
503cf15a 1966 if (ip_vs_control_net_init(net) < 0)
7a4f0761
HS
1967 goto control_fail;
1968
503cf15a 1969 if (ip_vs_protocol_net_init(net) < 0)
7a4f0761
HS
1970 goto protocol_fail;
1971
503cf15a 1972 if (ip_vs_app_net_init(net) < 0)
7a4f0761
HS
1973 goto app_fail;
1974
503cf15a 1975 if (ip_vs_conn_net_init(net) < 0)
7a4f0761
HS
1976 goto conn_fail;
1977
503cf15a 1978 if (ip_vs_sync_net_init(net) < 0)
7a4f0761
HS
1979 goto sync_fail;
1980
a870c8c5 1981 printk(KERN_INFO "IPVS: Creating netns size=%zu id=%d\n",
61b1ab45
HS
1982 sizeof(struct netns_ipvs), ipvs->gen);
1983 return 0;
7a4f0761
HS
1984/*
1985 * Error handling
1986 */
1987
1988sync_fail:
503cf15a 1989 ip_vs_conn_net_cleanup(net);
7a4f0761 1990conn_fail:
503cf15a 1991 ip_vs_app_net_cleanup(net);
7a4f0761 1992app_fail:
503cf15a 1993 ip_vs_protocol_net_cleanup(net);
7a4f0761 1994protocol_fail:
503cf15a 1995 ip_vs_control_net_cleanup(net);
7a4f0761 1996control_fail:
503cf15a 1997 ip_vs_estimator_net_cleanup(net);
7a4f0761 1998estimator_fail:
39f618b4 1999 net->ipvs = NULL;
7a4f0761 2000 return -ENOMEM;
61b1ab45
HS
2001}
2002
2003static void __net_exit __ip_vs_cleanup(struct net *net)
2004{
503cf15a
HS
2005 ip_vs_service_net_cleanup(net); /* ip_vs_flush() with locks */
2006 ip_vs_conn_net_cleanup(net);
2007 ip_vs_app_net_cleanup(net);
2008 ip_vs_protocol_net_cleanup(net);
2009 ip_vs_control_net_cleanup(net);
2010 ip_vs_estimator_net_cleanup(net);
1ae132b0 2011 IP_VS_DBG(2, "ipvs netns %d released\n", net_ipvs(net)->gen);
39f618b4 2012 net->ipvs = NULL;
61b1ab45
HS
2013}
2014
7a4f0761
HS
2015static void __net_exit __ip_vs_dev_cleanup(struct net *net)
2016{
2017 EnterFunction(2);
2018 net_ipvs(net)->enable = 0; /* Disable packet reception */
8f4e0a18 2019 smp_wmb();
503cf15a 2020 ip_vs_sync_net_cleanup(net);
7a4f0761
HS
2021 LeaveFunction(2);
2022}
2023
61b1ab45
HS
2024static struct pernet_operations ipvs_core_ops = {
2025 .init = __ip_vs_init,
2026 .exit = __ip_vs_cleanup,
2027 .id = &ip_vs_net_id,
2028 .size = sizeof(struct netns_ipvs),
2029};
1da177e4 2030
7a4f0761
HS
2031static struct pernet_operations ipvs_core_dev_ops = {
2032 .exit = __ip_vs_dev_cleanup,
2033};
2034
1da177e4
LT
2035/*
2036 * Initialize IP Virtual Server
2037 */
2038static int __init ip_vs_init(void)
2039{
2040 int ret;
2041
2042 ret = ip_vs_control_init();
2043 if (ret < 0) {
1e3e238e 2044 pr_err("can't setup control.\n");
6c8f7949 2045 goto exit;
1da177e4
LT
2046 }
2047
2048 ip_vs_protocol_init();
2049
1da177e4
LT
2050 ret = ip_vs_conn_init();
2051 if (ret < 0) {
1e3e238e 2052 pr_err("can't setup connection table.\n");
6c8f7949 2053 goto cleanup_protocol;
61b1ab45
HS
2054 }
2055
7a4f0761
HS
2056 ret = register_pernet_subsys(&ipvs_core_ops); /* Alloc ip_vs struct */
2057 if (ret < 0)
6c8f7949 2058 goto cleanup_conn;
7a4f0761
HS
2059
2060 ret = register_pernet_device(&ipvs_core_dev_ops);
2061 if (ret < 0)
2062 goto cleanup_sub;
2063
41c5b317 2064 ret = nf_register_hooks(ip_vs_ops, ARRAY_SIZE(ip_vs_ops));
1da177e4 2065 if (ret < 0) {
1e3e238e 2066 pr_err("can't register hooks.\n");
7a4f0761 2067 goto cleanup_dev;
1da177e4
LT
2068 }
2069
8537de8a
HS
2070 ret = ip_vs_register_nl_ioctl();
2071 if (ret < 0) {
2072 pr_err("can't register netlink/ioctl.\n");
2073 goto cleanup_hooks;
2074 }
2075
1e3e238e 2076 pr_info("ipvs loaded.\n");
7a4f0761 2077
1da177e4
LT
2078 return ret;
2079
8537de8a
HS
2080cleanup_hooks:
2081 nf_unregister_hooks(ip_vs_ops, ARRAY_SIZE(ip_vs_ops));
7a4f0761
HS
2082cleanup_dev:
2083 unregister_pernet_device(&ipvs_core_dev_ops);
2084cleanup_sub:
2085 unregister_pernet_subsys(&ipvs_core_ops);
552ad65a 2086cleanup_conn:
1da177e4 2087 ip_vs_conn_cleanup();
552ad65a 2088cleanup_protocol:
1da177e4
LT
2089 ip_vs_protocol_cleanup();
2090 ip_vs_control_cleanup();
6c8f7949 2091exit:
1da177e4
LT
2092 return ret;
2093}
2094
2095static void __exit ip_vs_cleanup(void)
2096{
8537de8a 2097 ip_vs_unregister_nl_ioctl();
41c5b317 2098 nf_unregister_hooks(ip_vs_ops, ARRAY_SIZE(ip_vs_ops));
7a4f0761
HS
2099 unregister_pernet_device(&ipvs_core_dev_ops);
2100 unregister_pernet_subsys(&ipvs_core_ops); /* free ip_vs struct */
1da177e4 2101 ip_vs_conn_cleanup();
1da177e4
LT
2102 ip_vs_protocol_cleanup();
2103 ip_vs_control_cleanup();
1e3e238e 2104 pr_info("ipvs unloaded.\n");
1da177e4
LT
2105}
2106
2107module_init(ip_vs_init);
2108module_exit(ip_vs_cleanup);
2109MODULE_LICENSE("GPL");
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