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
8 * Authors: Wensong Zhang <wensong@linuxvirtualserver.org>
9 * Peter Kese <peter.kese@ijs.si>
10 * Julian Anastasov <ja@ssi.bg>
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.
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
22 * Paul `Rusty' Russell properly handle non-linear skbs
23 * Harald Welte don't use nfcache
27 #define KMSG_COMPONENT "IPVS"
28 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
30 #include <linux/module.h>
31 #include <linux/kernel.h>
33 #include <linux/tcp.h>
34 #include <linux/sctp.h>
35 #include <linux/icmp.h>
36 #include <linux/slab.h>
41 #include <net/icmp.h> /* for icmp_send */
42 #include <net/route.h>
44 #include <linux/netfilter.h>
45 #include <linux/netfilter_ipv4.h>
47 #ifdef CONFIG_IP_VS_IPV6
49 #include <linux/netfilter_ipv6.h>
52 #include <net/ip_vs.h>
55 EXPORT_SYMBOL(register_ip_vs_scheduler
);
56 EXPORT_SYMBOL(unregister_ip_vs_scheduler
);
57 EXPORT_SYMBOL(ip_vs_skb_replace
);
58 EXPORT_SYMBOL(ip_vs_proto_name
);
59 EXPORT_SYMBOL(ip_vs_conn_new
);
60 EXPORT_SYMBOL(ip_vs_conn_in_get
);
61 EXPORT_SYMBOL(ip_vs_conn_out_get
);
62 #ifdef CONFIG_IP_VS_PROTO_TCP
63 EXPORT_SYMBOL(ip_vs_tcp_conn_listen
);
65 EXPORT_SYMBOL(ip_vs_conn_put
);
66 #ifdef CONFIG_IP_VS_DEBUG
67 EXPORT_SYMBOL(ip_vs_get_debug_level
);
71 /* ID used in ICMP lookups */
72 #define icmp_id(icmph) (((icmph)->un).echo.id)
73 #define icmpv6_id(icmph) (icmph->icmp6_dataun.u_echo.identifier)
75 const char *ip_vs_proto_name(unsigned proto
)
90 #ifdef CONFIG_IP_VS_IPV6
95 sprintf(buf
, "IP_%d", proto
);
100 void ip_vs_init_hash_table(struct list_head
*table
, int rows
)
103 INIT_LIST_HEAD(&table
[rows
]);
107 ip_vs_in_stats(struct ip_vs_conn
*cp
, struct sk_buff
*skb
)
109 struct ip_vs_dest
*dest
= cp
->dest
;
110 if (dest
&& (dest
->flags
& IP_VS_DEST_F_AVAILABLE
)) {
111 spin_lock(&dest
->stats
.lock
);
112 dest
->stats
.ustats
.inpkts
++;
113 dest
->stats
.ustats
.inbytes
+= skb
->len
;
114 spin_unlock(&dest
->stats
.lock
);
116 spin_lock(&dest
->svc
->stats
.lock
);
117 dest
->svc
->stats
.ustats
.inpkts
++;
118 dest
->svc
->stats
.ustats
.inbytes
+= skb
->len
;
119 spin_unlock(&dest
->svc
->stats
.lock
);
121 spin_lock(&ip_vs_stats
.lock
);
122 ip_vs_stats
.ustats
.inpkts
++;
123 ip_vs_stats
.ustats
.inbytes
+= skb
->len
;
124 spin_unlock(&ip_vs_stats
.lock
);
130 ip_vs_out_stats(struct ip_vs_conn
*cp
, struct sk_buff
*skb
)
132 struct ip_vs_dest
*dest
= cp
->dest
;
133 if (dest
&& (dest
->flags
& IP_VS_DEST_F_AVAILABLE
)) {
134 spin_lock(&dest
->stats
.lock
);
135 dest
->stats
.ustats
.outpkts
++;
136 dest
->stats
.ustats
.outbytes
+= skb
->len
;
137 spin_unlock(&dest
->stats
.lock
);
139 spin_lock(&dest
->svc
->stats
.lock
);
140 dest
->svc
->stats
.ustats
.outpkts
++;
141 dest
->svc
->stats
.ustats
.outbytes
+= skb
->len
;
142 spin_unlock(&dest
->svc
->stats
.lock
);
144 spin_lock(&ip_vs_stats
.lock
);
145 ip_vs_stats
.ustats
.outpkts
++;
146 ip_vs_stats
.ustats
.outbytes
+= skb
->len
;
147 spin_unlock(&ip_vs_stats
.lock
);
153 ip_vs_conn_stats(struct ip_vs_conn
*cp
, struct ip_vs_service
*svc
)
155 spin_lock(&cp
->dest
->stats
.lock
);
156 cp
->dest
->stats
.ustats
.conns
++;
157 spin_unlock(&cp
->dest
->stats
.lock
);
159 spin_lock(&svc
->stats
.lock
);
160 svc
->stats
.ustats
.conns
++;
161 spin_unlock(&svc
->stats
.lock
);
163 spin_lock(&ip_vs_stats
.lock
);
164 ip_vs_stats
.ustats
.conns
++;
165 spin_unlock(&ip_vs_stats
.lock
);
170 ip_vs_set_state(struct ip_vs_conn
*cp
, int direction
,
171 const struct sk_buff
*skb
,
172 struct ip_vs_protocol
*pp
)
174 if (unlikely(!pp
->state_transition
))
176 return pp
->state_transition(cp
, direction
, skb
, pp
);
181 * IPVS persistent scheduling function
182 * It creates a connection entry according to its template if exists,
183 * or selects a server and creates a connection entry plus a template.
184 * Locking: we are svc user (svc->refcnt), so we hold all dests too
185 * Protocols supported: TCP, UDP
187 static struct ip_vs_conn
*
188 ip_vs_sched_persist(struct ip_vs_service
*svc
,
189 const struct sk_buff
*skb
,
192 struct ip_vs_conn
*cp
= NULL
;
193 struct ip_vs_iphdr iph
;
194 struct ip_vs_dest
*dest
;
195 struct ip_vs_conn
*ct
;
196 __be16 dport
; /* destination port to forward */
197 union nf_inet_addr snet
; /* source network of the client,
200 ip_vs_fill_iphdr(svc
->af
, skb_network_header(skb
), &iph
);
202 /* Mask saddr with the netmask to adjust template granularity */
203 #ifdef CONFIG_IP_VS_IPV6
204 if (svc
->af
== AF_INET6
)
205 ipv6_addr_prefix(&snet
.in6
, &iph
.saddr
.in6
, svc
->netmask
);
208 snet
.ip
= iph
.saddr
.ip
& svc
->netmask
;
210 IP_VS_DBG_BUF(6, "p-schedule: src %s:%u dest %s:%u "
212 IP_VS_DBG_ADDR(svc
->af
, &iph
.saddr
), ntohs(ports
[0]),
213 IP_VS_DBG_ADDR(svc
->af
, &iph
.daddr
), ntohs(ports
[1]),
214 IP_VS_DBG_ADDR(svc
->af
, &snet
));
217 * As far as we know, FTP is a very complicated network protocol, and
218 * it uses control connection and data connections. For active FTP,
219 * FTP server initialize data connection to the client, its source port
220 * is often 20. For passive FTP, FTP server tells the clients the port
221 * that it passively listens to, and the client issues the data
222 * connection. In the tunneling or direct routing mode, the load
223 * balancer is on the client-to-server half of connection, the port
224 * number is unknown to the load balancer. So, a conn template like
225 * <caddr, 0, vaddr, 0, daddr, 0> is created for persistent FTP
226 * service, and a template like <caddr, 0, vaddr, vport, daddr, dport>
227 * is created for other persistent services.
229 if (ports
[1] == svc
->port
) {
230 /* Check if a template already exists */
231 if (svc
->port
!= FTPPORT
)
232 ct
= ip_vs_ct_in_get(svc
->af
, iph
.protocol
, &snet
, 0,
233 &iph
.daddr
, ports
[1]);
235 ct
= ip_vs_ct_in_get(svc
->af
, iph
.protocol
, &snet
, 0,
238 if (!ct
|| !ip_vs_check_template(ct
)) {
240 * No template found or the dest of the connection
241 * template is not available.
243 dest
= svc
->scheduler
->schedule(svc
, skb
);
245 IP_VS_DBG(1, "p-schedule: no dest found.\n");
250 * Create a template like <protocol,caddr,0,
251 * vaddr,vport,daddr,dport> for non-ftp service,
252 * and <protocol,caddr,0,vaddr,0,daddr,0>
255 if (svc
->port
!= FTPPORT
)
256 ct
= ip_vs_conn_new(svc
->af
, iph
.protocol
,
260 &dest
->addr
, dest
->port
,
261 IP_VS_CONN_F_TEMPLATE
,
264 ct
= ip_vs_conn_new(svc
->af
, iph
.protocol
,
268 IP_VS_CONN_F_TEMPLATE
,
273 ct
->timeout
= svc
->timeout
;
275 /* set destination with the found template */
281 * Note: persistent fwmark-based services and persistent
282 * port zero service are handled here.
283 * fwmark template: <IPPROTO_IP,caddr,0,fwmark,0,daddr,0>
284 * port zero template: <protocol,caddr,0,vaddr,0,daddr,0>
287 union nf_inet_addr fwmark
= {
288 .ip
= htonl(svc
->fwmark
)
291 ct
= ip_vs_ct_in_get(svc
->af
, IPPROTO_IP
, &snet
, 0,
294 ct
= ip_vs_ct_in_get(svc
->af
, iph
.protocol
, &snet
, 0,
297 if (!ct
|| !ip_vs_check_template(ct
)) {
299 * If it is not persistent port zero, return NULL,
300 * otherwise create a connection template.
305 dest
= svc
->scheduler
->schedule(svc
, skb
);
307 IP_VS_DBG(1, "p-schedule: no dest found.\n");
312 * Create a template according to the service
315 union nf_inet_addr fwmark
= {
316 .ip
= htonl(svc
->fwmark
)
319 ct
= ip_vs_conn_new(svc
->af
, IPPROTO_IP
,
323 IP_VS_CONN_F_TEMPLATE
,
326 ct
= ip_vs_conn_new(svc
->af
, iph
.protocol
,
330 IP_VS_CONN_F_TEMPLATE
,
335 ct
->timeout
= svc
->timeout
;
337 /* set destination with the found template */
344 * Create a new connection according to the template
346 cp
= ip_vs_conn_new(svc
->af
, iph
.protocol
,
347 &iph
.saddr
, ports
[0],
348 &iph
.daddr
, ports
[1],
360 ip_vs_control_add(cp
, ct
);
363 ip_vs_conn_stats(cp
, svc
);
369 * IPVS main scheduling function
370 * It selects a server according to the virtual service, and
371 * creates a connection entry.
372 * Protocols supported: TCP, UDP
375 ip_vs_schedule(struct ip_vs_service
*svc
, const struct sk_buff
*skb
)
377 struct ip_vs_conn
*cp
= NULL
;
378 struct ip_vs_iphdr iph
;
379 struct ip_vs_dest
*dest
;
380 __be16 _ports
[2], *pptr
;
382 ip_vs_fill_iphdr(svc
->af
, skb_network_header(skb
), &iph
);
383 pptr
= skb_header_pointer(skb
, iph
.len
, sizeof(_ports
), _ports
);
390 if (svc
->flags
& IP_VS_SVC_F_PERSISTENT
)
391 return ip_vs_sched_persist(svc
, skb
, pptr
);
394 * Non-persistent service
396 if (!svc
->fwmark
&& pptr
[1] != svc
->port
) {
398 pr_err("Schedule: port zero only supported "
399 "in persistent services, "
400 "check your ipvs configuration\n");
404 dest
= svc
->scheduler
->schedule(svc
, skb
);
406 IP_VS_DBG(1, "Schedule: no dest found.\n");
411 * Create a connection entry.
413 cp
= ip_vs_conn_new(svc
->af
, iph
.protocol
,
416 &dest
->addr
, dest
->port
? dest
->port
: pptr
[1],
422 IP_VS_DBG_BUF(6, "Schedule fwd:%c c:%s:%u v:%s:%u "
423 "d:%s:%u conn->flags:%X conn->refcnt:%d\n",
425 IP_VS_DBG_ADDR(svc
->af
, &cp
->caddr
), ntohs(cp
->cport
),
426 IP_VS_DBG_ADDR(svc
->af
, &cp
->vaddr
), ntohs(cp
->vport
),
427 IP_VS_DBG_ADDR(svc
->af
, &cp
->daddr
), ntohs(cp
->dport
),
428 cp
->flags
, atomic_read(&cp
->refcnt
));
430 ip_vs_conn_stats(cp
, svc
);
436 * Pass or drop the packet.
437 * Called by ip_vs_in, when the virtual service is available but
438 * no destination is available for a new connection.
440 int ip_vs_leave(struct ip_vs_service
*svc
, struct sk_buff
*skb
,
441 struct ip_vs_protocol
*pp
)
443 __be16 _ports
[2], *pptr
;
444 struct ip_vs_iphdr iph
;
446 ip_vs_fill_iphdr(svc
->af
, skb_network_header(skb
), &iph
);
448 pptr
= skb_header_pointer(skb
, iph
.len
, sizeof(_ports
), _ports
);
450 ip_vs_service_put(svc
);
454 #ifdef CONFIG_IP_VS_IPV6
455 if (svc
->af
== AF_INET6
)
456 unicast
= ipv6_addr_type(&iph
.daddr
.in6
) & IPV6_ADDR_UNICAST
;
459 unicast
= (inet_addr_type(&init_net
, iph
.daddr
.ip
) == RTN_UNICAST
);
461 /* if it is fwmark-based service, the cache_bypass sysctl is up
462 and the destination is a non-local unicast, then create
463 a cache_bypass connection entry */
464 if (sysctl_ip_vs_cache_bypass
&& svc
->fwmark
&& unicast
) {
466 struct ip_vs_conn
*cp
;
467 union nf_inet_addr daddr
= { .all
= { 0, 0, 0, 0 } };
469 ip_vs_service_put(svc
);
471 /* create a new connection entry */
472 IP_VS_DBG(6, "%s(): create a cache_bypass entry\n", __func__
);
473 cp
= ip_vs_conn_new(svc
->af
, iph
.protocol
,
483 ip_vs_in_stats(cp
, skb
);
486 cs
= ip_vs_set_state(cp
, IP_VS_DIR_INPUT
, skb
, pp
);
488 /* transmit the first SYN packet */
489 ret
= cp
->packet_xmit(skb
, cp
, pp
);
490 /* do not touch skb anymore */
492 atomic_inc(&cp
->in_pkts
);
498 * When the virtual ftp service is presented, packets destined
499 * for other services on the VIP may get here (except services
500 * listed in the ipvs table), pass the packets, because it is
501 * not ipvs job to decide to drop the packets.
503 if ((svc
->port
== FTPPORT
) && (pptr
[1] != FTPPORT
)) {
504 ip_vs_service_put(svc
);
508 ip_vs_service_put(svc
);
511 * Notify the client that the destination is unreachable, and
512 * release the socket buffer.
513 * Since it is in IP layer, the TCP socket is not actually
514 * created, the TCP RST packet cannot be sent, instead that
515 * ICMP_PORT_UNREACH is sent here no matter it is TCP/UDP. --WZ
517 #ifdef CONFIG_IP_VS_IPV6
518 if (svc
->af
== AF_INET6
)
519 icmpv6_send(skb
, ICMPV6_DEST_UNREACH
, ICMPV6_PORT_UNREACH
, 0);
522 icmp_send(skb
, ICMP_DEST_UNREACH
, ICMP_PORT_UNREACH
, 0);
529 * It is hooked before NF_IP_PRI_NAT_SRC at the NF_INET_POST_ROUTING
530 * chain, and is used for VS/NAT.
531 * It detects packets for VS/NAT connections and sends the packets
532 * immediately. This can avoid that iptable_nat mangles the packets
535 static unsigned int ip_vs_post_routing(unsigned int hooknum
,
537 const struct net_device
*in
,
538 const struct net_device
*out
,
539 int (*okfn
)(struct sk_buff
*))
541 if (!skb
->ipvs_property
)
543 /* The packet was sent from IPVS, exit this chain */
547 __sum16
ip_vs_checksum_complete(struct sk_buff
*skb
, int offset
)
549 return csum_fold(skb_checksum(skb
, offset
, skb
->len
- offset
, 0));
552 static inline int ip_vs_gather_frags(struct sk_buff
*skb
, u_int32_t user
)
554 int err
= ip_defrag(skb
, user
);
557 ip_send_check(ip_hdr(skb
));
562 #ifdef CONFIG_IP_VS_IPV6
563 static inline int ip_vs_gather_frags_v6(struct sk_buff
*skb
, u_int32_t user
)
565 /* TODO IPv6: Find out what to do here for IPv6 */
571 * Packet has been made sufficiently writable in caller
572 * - inout: 1=in->out, 0=out->in
574 void ip_vs_nat_icmp(struct sk_buff
*skb
, struct ip_vs_protocol
*pp
,
575 struct ip_vs_conn
*cp
, int inout
)
577 struct iphdr
*iph
= ip_hdr(skb
);
578 unsigned int icmp_offset
= iph
->ihl
*4;
579 struct icmphdr
*icmph
= (struct icmphdr
*)(skb_network_header(skb
) +
581 struct iphdr
*ciph
= (struct iphdr
*)(icmph
+ 1);
584 iph
->saddr
= cp
->vaddr
.ip
;
586 ciph
->daddr
= cp
->vaddr
.ip
;
589 iph
->daddr
= cp
->daddr
.ip
;
591 ciph
->saddr
= cp
->daddr
.ip
;
595 /* the TCP/UDP/SCTP port */
596 if (IPPROTO_TCP
== ciph
->protocol
|| IPPROTO_UDP
== ciph
->protocol
||
597 IPPROTO_SCTP
== ciph
->protocol
) {
598 __be16
*ports
= (void *)ciph
+ ciph
->ihl
*4;
601 ports
[1] = cp
->vport
;
603 ports
[0] = cp
->dport
;
606 /* And finally the ICMP checksum */
608 icmph
->checksum
= ip_vs_checksum_complete(skb
, icmp_offset
);
609 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
612 IP_VS_DBG_PKT(11, pp
, skb
, (void *)ciph
- (void *)iph
,
613 "Forwarding altered outgoing ICMP");
615 IP_VS_DBG_PKT(11, pp
, skb
, (void *)ciph
- (void *)iph
,
616 "Forwarding altered incoming ICMP");
619 #ifdef CONFIG_IP_VS_IPV6
620 void ip_vs_nat_icmp_v6(struct sk_buff
*skb
, struct ip_vs_protocol
*pp
,
621 struct ip_vs_conn
*cp
, int inout
)
623 struct ipv6hdr
*iph
= ipv6_hdr(skb
);
624 unsigned int icmp_offset
= sizeof(struct ipv6hdr
);
625 struct icmp6hdr
*icmph
= (struct icmp6hdr
*)(skb_network_header(skb
) +
627 struct ipv6hdr
*ciph
= (struct ipv6hdr
*)(icmph
+ 1);
630 iph
->saddr
= cp
->vaddr
.in6
;
631 ciph
->daddr
= cp
->vaddr
.in6
;
633 iph
->daddr
= cp
->daddr
.in6
;
634 ciph
->saddr
= cp
->daddr
.in6
;
637 /* the TCP/UDP/SCTP port */
638 if (IPPROTO_TCP
== ciph
->nexthdr
|| IPPROTO_UDP
== ciph
->nexthdr
||
639 IPPROTO_SCTP
== ciph
->nexthdr
) {
640 __be16
*ports
= (void *)ciph
+ sizeof(struct ipv6hdr
);
643 ports
[1] = cp
->vport
;
645 ports
[0] = cp
->dport
;
648 /* And finally the ICMP checksum */
649 icmph
->icmp6_cksum
= 0;
650 /* TODO IPv6: is this correct for ICMPv6? */
651 ip_vs_checksum_complete(skb
, icmp_offset
);
652 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
655 IP_VS_DBG_PKT(11, pp
, skb
, (void *)ciph
- (void *)iph
,
656 "Forwarding altered outgoing ICMPv6");
658 IP_VS_DBG_PKT(11, pp
, skb
, (void *)ciph
- (void *)iph
,
659 "Forwarding altered incoming ICMPv6");
663 /* Handle relevant response ICMP messages - forward to the right
664 * destination host. Used for NAT and local client.
666 static int handle_response_icmp(int af
, struct sk_buff
*skb
,
667 union nf_inet_addr
*snet
,
668 __u8 protocol
, struct ip_vs_conn
*cp
,
669 struct ip_vs_protocol
*pp
,
670 unsigned int offset
, unsigned int ihl
)
672 unsigned int verdict
= NF_DROP
;
674 if (IP_VS_FWD_METHOD(cp
) != 0) {
675 pr_err("shouldn't reach here, because the box is on the "
676 "half connection in the tun/dr module.\n");
679 /* Ensure the checksum is correct */
680 if (!skb_csum_unnecessary(skb
) && ip_vs_checksum_complete(skb
, ihl
)) {
681 /* Failed checksum! */
682 IP_VS_DBG_BUF(1, "Forward ICMP: failed checksum from %s!\n",
683 IP_VS_DBG_ADDR(af
, snet
));
687 if (IPPROTO_TCP
== protocol
|| IPPROTO_UDP
== protocol
||
688 IPPROTO_SCTP
== protocol
)
689 offset
+= 2 * sizeof(__u16
);
690 if (!skb_make_writable(skb
, offset
))
693 #ifdef CONFIG_IP_VS_IPV6
695 ip_vs_nat_icmp_v6(skb
, pp
, cp
, 1);
698 ip_vs_nat_icmp(skb
, pp
, cp
, 1);
700 /* do the statistics and put it back */
701 ip_vs_out_stats(cp
, skb
);
703 skb
->ipvs_property
= 1;
707 __ip_vs_conn_put(cp
);
713 * Handle ICMP messages in the inside-to-outside direction (outgoing).
714 * Find any that might be relevant, check against existing connections.
715 * Currently handles error types - unreachable, quench, ttl exceeded.
717 static int ip_vs_out_icmp(struct sk_buff
*skb
, int *related
)
720 struct icmphdr _icmph
, *ic
;
721 struct iphdr _ciph
, *cih
; /* The ip header contained within the ICMP */
722 struct ip_vs_iphdr ciph
;
723 struct ip_vs_conn
*cp
;
724 struct ip_vs_protocol
*pp
;
725 unsigned int offset
, ihl
;
726 union nf_inet_addr snet
;
730 /* reassemble IP fragments */
731 if (ip_hdr(skb
)->frag_off
& htons(IP_MF
| IP_OFFSET
)) {
732 if (ip_vs_gather_frags(skb
, IP_DEFRAG_VS_OUT
))
737 offset
= ihl
= iph
->ihl
* 4;
738 ic
= skb_header_pointer(skb
, offset
, sizeof(_icmph
), &_icmph
);
742 IP_VS_DBG(12, "Outgoing ICMP (%d,%d) %pI4->%pI4\n",
743 ic
->type
, ntohs(icmp_id(ic
)),
744 &iph
->saddr
, &iph
->daddr
);
747 * Work through seeing if this is for us.
748 * These checks are supposed to be in an order that means easy
749 * things are checked first to speed up processing.... however
750 * this means that some packets will manage to get a long way
751 * down this stack and then be rejected, but that's life.
753 if ((ic
->type
!= ICMP_DEST_UNREACH
) &&
754 (ic
->type
!= ICMP_SOURCE_QUENCH
) &&
755 (ic
->type
!= ICMP_TIME_EXCEEDED
)) {
760 /* Now find the contained IP header */
761 offset
+= sizeof(_icmph
);
762 cih
= skb_header_pointer(skb
, offset
, sizeof(_ciph
), &_ciph
);
764 return NF_ACCEPT
; /* The packet looks wrong, ignore */
766 pp
= ip_vs_proto_get(cih
->protocol
);
770 /* Is the embedded protocol header present? */
771 if (unlikely(cih
->frag_off
& htons(IP_OFFSET
) &&
775 IP_VS_DBG_PKT(11, pp
, skb
, offset
, "Checking outgoing ICMP for");
777 offset
+= cih
->ihl
* 4;
779 ip_vs_fill_iphdr(AF_INET
, cih
, &ciph
);
780 /* The embedded headers contain source and dest in reverse order */
781 cp
= pp
->conn_out_get(AF_INET
, skb
, pp
, &ciph
, offset
, 1);
785 snet
.ip
= iph
->saddr
;
786 return handle_response_icmp(AF_INET
, skb
, &snet
, cih
->protocol
, cp
,
790 #ifdef CONFIG_IP_VS_IPV6
791 static int ip_vs_out_icmp_v6(struct sk_buff
*skb
, int *related
)
794 struct icmp6hdr _icmph
, *ic
;
795 struct ipv6hdr _ciph
, *cih
; /* The ip header contained
797 struct ip_vs_iphdr ciph
;
798 struct ip_vs_conn
*cp
;
799 struct ip_vs_protocol
*pp
;
801 union nf_inet_addr snet
;
805 /* reassemble IP fragments */
806 if (ipv6_hdr(skb
)->nexthdr
== IPPROTO_FRAGMENT
) {
807 if (ip_vs_gather_frags_v6(skb
, IP_DEFRAG_VS_OUT
))
812 offset
= sizeof(struct ipv6hdr
);
813 ic
= skb_header_pointer(skb
, offset
, sizeof(_icmph
), &_icmph
);
817 IP_VS_DBG(12, "Outgoing ICMPv6 (%d,%d) %pI6->%pI6\n",
818 ic
->icmp6_type
, ntohs(icmpv6_id(ic
)),
819 &iph
->saddr
, &iph
->daddr
);
822 * Work through seeing if this is for us.
823 * These checks are supposed to be in an order that means easy
824 * things are checked first to speed up processing.... however
825 * this means that some packets will manage to get a long way
826 * down this stack and then be rejected, but that's life.
828 if ((ic
->icmp6_type
!= ICMPV6_DEST_UNREACH
) &&
829 (ic
->icmp6_type
!= ICMPV6_PKT_TOOBIG
) &&
830 (ic
->icmp6_type
!= ICMPV6_TIME_EXCEED
)) {
835 /* Now find the contained IP header */
836 offset
+= sizeof(_icmph
);
837 cih
= skb_header_pointer(skb
, offset
, sizeof(_ciph
), &_ciph
);
839 return NF_ACCEPT
; /* The packet looks wrong, ignore */
841 pp
= ip_vs_proto_get(cih
->nexthdr
);
845 /* Is the embedded protocol header present? */
846 /* TODO: we don't support fragmentation at the moment anyways */
847 if (unlikely(cih
->nexthdr
== IPPROTO_FRAGMENT
&& pp
->dont_defrag
))
850 IP_VS_DBG_PKT(11, pp
, skb
, offset
, "Checking outgoing ICMPv6 for");
852 offset
+= sizeof(struct ipv6hdr
);
854 ip_vs_fill_iphdr(AF_INET6
, cih
, &ciph
);
855 /* The embedded headers contain source and dest in reverse order */
856 cp
= pp
->conn_out_get(AF_INET6
, skb
, pp
, &ciph
, offset
, 1);
860 ipv6_addr_copy(&snet
.in6
, &iph
->saddr
);
861 return handle_response_icmp(AF_INET6
, skb
, &snet
, cih
->nexthdr
, cp
,
862 pp
, offset
, sizeof(struct ipv6hdr
));
867 * Check if sctp chunc is ABORT chunk
869 static inline int is_sctp_abort(const struct sk_buff
*skb
, int nh_len
)
871 sctp_chunkhdr_t
*sch
, schunk
;
872 sch
= skb_header_pointer(skb
, nh_len
+ sizeof(sctp_sctphdr_t
),
873 sizeof(schunk
), &schunk
);
876 if (sch
->type
== SCTP_CID_ABORT
)
881 static inline int is_tcp_reset(const struct sk_buff
*skb
, int nh_len
)
883 struct tcphdr _tcph
, *th
;
885 th
= skb_header_pointer(skb
, nh_len
, sizeof(_tcph
), &_tcph
);
891 /* Handle response packets: rewrite addresses and send away...
892 * Used for NAT and local client.
895 handle_response(int af
, struct sk_buff
*skb
, struct ip_vs_protocol
*pp
,
896 struct ip_vs_conn
*cp
, int ihl
)
898 IP_VS_DBG_PKT(11, pp
, skb
, 0, "Outgoing packet");
900 if (!skb_make_writable(skb
, ihl
))
903 /* mangle the packet */
904 if (pp
->snat_handler
&& !pp
->snat_handler(skb
, pp
, cp
))
907 #ifdef CONFIG_IP_VS_IPV6
909 ipv6_hdr(skb
)->saddr
= cp
->vaddr
.in6
;
913 ip_hdr(skb
)->saddr
= cp
->vaddr
.ip
;
914 ip_send_check(ip_hdr(skb
));
917 /* For policy routing, packets originating from this
918 * machine itself may be routed differently to packets
919 * passing through. We want this packet to be routed as
920 * if it came from this machine itself. So re-compute
921 * the routing information.
923 #ifdef CONFIG_IP_VS_IPV6
924 if (af
== AF_INET6
) {
925 if (ip6_route_me_harder(skb
) != 0)
929 if (ip_route_me_harder(skb
, RTN_LOCAL
) != 0)
932 IP_VS_DBG_PKT(10, pp
, skb
, 0, "After SNAT");
934 ip_vs_out_stats(cp
, skb
);
935 ip_vs_set_state(cp
, IP_VS_DIR_OUTPUT
, skb
, pp
);
938 skb
->ipvs_property
= 1;
950 * It is hooked at the NF_INET_FORWARD chain, used only for VS/NAT.
951 * Check if outgoing packet belongs to the established ip_vs_conn.
954 ip_vs_out(unsigned int hooknum
, struct sk_buff
*skb
,
955 const struct net_device
*in
, const struct net_device
*out
,
956 int (*okfn
)(struct sk_buff
*))
958 struct ip_vs_iphdr iph
;
959 struct ip_vs_protocol
*pp
;
960 struct ip_vs_conn
*cp
;
965 af
= (skb
->protocol
== htons(ETH_P_IP
)) ? AF_INET
: AF_INET6
;
967 if (skb
->ipvs_property
)
970 ip_vs_fill_iphdr(af
, skb_network_header(skb
), &iph
);
971 #ifdef CONFIG_IP_VS_IPV6
972 if (af
== AF_INET6
) {
973 if (unlikely(iph
.protocol
== IPPROTO_ICMPV6
)) {
974 int related
, verdict
= ip_vs_out_icmp_v6(skb
, &related
);
978 ip_vs_fill_iphdr(af
, skb_network_header(skb
), &iph
);
982 if (unlikely(iph
.protocol
== IPPROTO_ICMP
)) {
983 int related
, verdict
= ip_vs_out_icmp(skb
, &related
);
987 ip_vs_fill_iphdr(af
, skb_network_header(skb
), &iph
);
990 pp
= ip_vs_proto_get(iph
.protocol
);
994 /* reassemble IP fragments */
995 #ifdef CONFIG_IP_VS_IPV6
996 if (af
== AF_INET6
) {
997 if (unlikely(iph
.protocol
== IPPROTO_ICMPV6
)) {
998 int related
, verdict
= ip_vs_out_icmp_v6(skb
, &related
);
1003 ip_vs_fill_iphdr(af
, skb_network_header(skb
), &iph
);
1007 if (unlikely(ip_hdr(skb
)->frag_off
& htons(IP_MF
|IP_OFFSET
) &&
1008 !pp
->dont_defrag
)) {
1009 if (ip_vs_gather_frags(skb
, IP_DEFRAG_VS_OUT
))
1012 ip_vs_fill_iphdr(af
, skb_network_header(skb
), &iph
);
1016 * Check if the packet belongs to an existing entry
1018 cp
= pp
->conn_out_get(af
, skb
, pp
, &iph
, iph
.len
, 0);
1020 if (unlikely(!cp
)) {
1021 if (sysctl_ip_vs_nat_icmp_send
&&
1022 (pp
->protocol
== IPPROTO_TCP
||
1023 pp
->protocol
== IPPROTO_UDP
||
1024 pp
->protocol
== IPPROTO_SCTP
)) {
1025 __be16 _ports
[2], *pptr
;
1027 pptr
= skb_header_pointer(skb
, iph
.len
,
1028 sizeof(_ports
), _ports
);
1030 return NF_ACCEPT
; /* Not for me */
1031 if (ip_vs_lookup_real_service(af
, iph
.protocol
,
1035 * Notify the real server: there is no
1036 * existing entry if it is not RST
1037 * packet or not TCP packet.
1039 if ((iph
.protocol
!= IPPROTO_TCP
&&
1040 iph
.protocol
!= IPPROTO_SCTP
)
1041 || ((iph
.protocol
== IPPROTO_TCP
1042 && !is_tcp_reset(skb
, iph
.len
))
1043 || (iph
.protocol
== IPPROTO_SCTP
1044 && !is_sctp_abort(skb
,
1046 #ifdef CONFIG_IP_VS_IPV6
1049 ICMPV6_DEST_UNREACH
,
1050 ICMPV6_PORT_UNREACH
,
1056 ICMP_PORT_UNREACH
, 0);
1061 IP_VS_DBG_PKT(12, pp
, skb
, 0,
1062 "packet continues traversal as normal");
1066 return handle_response(af
, skb
, pp
, cp
, iph
.len
);
1071 * Handle ICMP messages in the outside-to-inside direction (incoming).
1072 * Find any that might be relevant, check against existing connections,
1073 * forward to the right destination host if relevant.
1074 * Currently handles error types - unreachable, quench, ttl exceeded.
1077 ip_vs_in_icmp(struct sk_buff
*skb
, int *related
, unsigned int hooknum
)
1080 struct icmphdr _icmph
, *ic
;
1081 struct iphdr _ciph
, *cih
; /* The ip header contained within the ICMP */
1082 struct ip_vs_iphdr ciph
;
1083 struct ip_vs_conn
*cp
;
1084 struct ip_vs_protocol
*pp
;
1085 unsigned int offset
, ihl
, verdict
;
1086 union nf_inet_addr snet
;
1090 /* reassemble IP fragments */
1091 if (ip_hdr(skb
)->frag_off
& htons(IP_MF
| IP_OFFSET
)) {
1092 if (ip_vs_gather_frags(skb
, hooknum
== NF_INET_LOCAL_IN
?
1093 IP_DEFRAG_VS_IN
: IP_DEFRAG_VS_FWD
))
1098 offset
= ihl
= iph
->ihl
* 4;
1099 ic
= skb_header_pointer(skb
, offset
, sizeof(_icmph
), &_icmph
);
1103 IP_VS_DBG(12, "Incoming ICMP (%d,%d) %pI4->%pI4\n",
1104 ic
->type
, ntohs(icmp_id(ic
)),
1105 &iph
->saddr
, &iph
->daddr
);
1108 * Work through seeing if this is for us.
1109 * These checks are supposed to be in an order that means easy
1110 * things are checked first to speed up processing.... however
1111 * this means that some packets will manage to get a long way
1112 * down this stack and then be rejected, but that's life.
1114 if ((ic
->type
!= ICMP_DEST_UNREACH
) &&
1115 (ic
->type
!= ICMP_SOURCE_QUENCH
) &&
1116 (ic
->type
!= ICMP_TIME_EXCEEDED
)) {
1121 /* Now find the contained IP header */
1122 offset
+= sizeof(_icmph
);
1123 cih
= skb_header_pointer(skb
, offset
, sizeof(_ciph
), &_ciph
);
1125 return NF_ACCEPT
; /* The packet looks wrong, ignore */
1127 pp
= ip_vs_proto_get(cih
->protocol
);
1131 /* Is the embedded protocol header present? */
1132 if (unlikely(cih
->frag_off
& htons(IP_OFFSET
) &&
1136 IP_VS_DBG_PKT(11, pp
, skb
, offset
, "Checking incoming ICMP for");
1138 offset
+= cih
->ihl
* 4;
1140 ip_vs_fill_iphdr(AF_INET
, cih
, &ciph
);
1141 /* The embedded headers contain source and dest in reverse order */
1142 cp
= pp
->conn_in_get(AF_INET
, skb
, pp
, &ciph
, offset
, 1);
1144 /* The packet could also belong to a local client */
1145 cp
= pp
->conn_out_get(AF_INET
, skb
, pp
, &ciph
, offset
, 1);
1147 snet
.ip
= iph
->saddr
;
1148 return handle_response_icmp(AF_INET
, skb
, &snet
,
1149 cih
->protocol
, cp
, pp
,
1157 /* Ensure the checksum is correct */
1158 if (!skb_csum_unnecessary(skb
) && ip_vs_checksum_complete(skb
, ihl
)) {
1159 /* Failed checksum! */
1160 IP_VS_DBG(1, "Incoming ICMP: failed checksum from %pI4!\n",
1165 /* do the statistics and put it back */
1166 ip_vs_in_stats(cp
, skb
);
1167 if (IPPROTO_TCP
== cih
->protocol
|| IPPROTO_UDP
== cih
->protocol
)
1168 offset
+= 2 * sizeof(__u16
);
1169 verdict
= ip_vs_icmp_xmit(skb
, cp
, pp
, offset
);
1170 /* do not touch skb anymore */
1173 __ip_vs_conn_put(cp
);
1178 #ifdef CONFIG_IP_VS_IPV6
1180 ip_vs_in_icmp_v6(struct sk_buff
*skb
, int *related
, unsigned int hooknum
)
1182 struct ipv6hdr
*iph
;
1183 struct icmp6hdr _icmph
, *ic
;
1184 struct ipv6hdr _ciph
, *cih
; /* The ip header contained
1186 struct ip_vs_iphdr ciph
;
1187 struct ip_vs_conn
*cp
;
1188 struct ip_vs_protocol
*pp
;
1189 unsigned int offset
, verdict
;
1190 union nf_inet_addr snet
;
1194 /* reassemble IP fragments */
1195 if (ipv6_hdr(skb
)->nexthdr
== IPPROTO_FRAGMENT
) {
1196 if (ip_vs_gather_frags_v6(skb
, hooknum
== NF_INET_LOCAL_IN
?
1202 iph
= ipv6_hdr(skb
);
1203 offset
= sizeof(struct ipv6hdr
);
1204 ic
= skb_header_pointer(skb
, offset
, sizeof(_icmph
), &_icmph
);
1208 IP_VS_DBG(12, "Incoming ICMPv6 (%d,%d) %pI6->%pI6\n",
1209 ic
->icmp6_type
, ntohs(icmpv6_id(ic
)),
1210 &iph
->saddr
, &iph
->daddr
);
1213 * Work through seeing if this is for us.
1214 * These checks are supposed to be in an order that means easy
1215 * things are checked first to speed up processing.... however
1216 * this means that some packets will manage to get a long way
1217 * down this stack and then be rejected, but that's life.
1219 if ((ic
->icmp6_type
!= ICMPV6_DEST_UNREACH
) &&
1220 (ic
->icmp6_type
!= ICMPV6_PKT_TOOBIG
) &&
1221 (ic
->icmp6_type
!= ICMPV6_TIME_EXCEED
)) {
1226 /* Now find the contained IP header */
1227 offset
+= sizeof(_icmph
);
1228 cih
= skb_header_pointer(skb
, offset
, sizeof(_ciph
), &_ciph
);
1230 return NF_ACCEPT
; /* The packet looks wrong, ignore */
1232 pp
= ip_vs_proto_get(cih
->nexthdr
);
1236 /* Is the embedded protocol header present? */
1237 /* TODO: we don't support fragmentation at the moment anyways */
1238 if (unlikely(cih
->nexthdr
== IPPROTO_FRAGMENT
&& pp
->dont_defrag
))
1241 IP_VS_DBG_PKT(11, pp
, skb
, offset
, "Checking incoming ICMPv6 for");
1243 offset
+= sizeof(struct ipv6hdr
);
1245 ip_vs_fill_iphdr(AF_INET6
, cih
, &ciph
);
1246 /* The embedded headers contain source and dest in reverse order */
1247 cp
= pp
->conn_in_get(AF_INET6
, skb
, pp
, &ciph
, offset
, 1);
1249 /* The packet could also belong to a local client */
1250 cp
= pp
->conn_out_get(AF_INET6
, skb
, pp
, &ciph
, offset
, 1);
1252 ipv6_addr_copy(&snet
.in6
, &iph
->saddr
);
1253 return handle_response_icmp(AF_INET6
, skb
, &snet
,
1256 sizeof(struct ipv6hdr
));
1263 /* do the statistics and put it back */
1264 ip_vs_in_stats(cp
, skb
);
1265 if (IPPROTO_TCP
== cih
->nexthdr
|| IPPROTO_UDP
== cih
->nexthdr
||
1266 IPPROTO_SCTP
== cih
->nexthdr
)
1267 offset
+= 2 * sizeof(__u16
);
1268 verdict
= ip_vs_icmp_xmit_v6(skb
, cp
, pp
, offset
);
1269 /* do not touch skb anymore */
1271 __ip_vs_conn_put(cp
);
1279 * Check if it's for virtual services, look it up,
1280 * and send it on its way...
1283 ip_vs_in(unsigned int hooknum
, struct sk_buff
*skb
,
1284 const struct net_device
*in
, const struct net_device
*out
,
1285 int (*okfn
)(struct sk_buff
*))
1287 struct ip_vs_iphdr iph
;
1288 struct ip_vs_protocol
*pp
;
1289 struct ip_vs_conn
*cp
;
1290 int ret
, restart
, af
, pkts
;
1292 af
= (skb
->protocol
== htons(ETH_P_IP
)) ? AF_INET
: AF_INET6
;
1294 ip_vs_fill_iphdr(af
, skb_network_header(skb
), &iph
);
1297 * Big tappo: only PACKET_HOST, including loopback for local client
1298 * Don't handle local packets on IPv6 for now
1300 if (unlikely(skb
->pkt_type
!= PACKET_HOST
)) {
1301 IP_VS_DBG_BUF(12, "packet type=%d proto=%d daddr=%s ignored\n",
1304 IP_VS_DBG_ADDR(af
, &iph
.daddr
));
1308 #ifdef CONFIG_IP_VS_IPV6
1309 if (af
== AF_INET6
) {
1310 if (unlikely(iph
.protocol
== IPPROTO_ICMPV6
)) {
1311 int related
, verdict
= ip_vs_in_icmp_v6(skb
, &related
, hooknum
);
1315 ip_vs_fill_iphdr(af
, skb_network_header(skb
), &iph
);
1319 if (unlikely(iph
.protocol
== IPPROTO_ICMP
)) {
1320 int related
, verdict
= ip_vs_in_icmp(skb
, &related
, hooknum
);
1324 ip_vs_fill_iphdr(af
, skb_network_header(skb
), &iph
);
1327 /* Protocol supported? */
1328 pp
= ip_vs_proto_get(iph
.protocol
);
1333 * Check if the packet belongs to an existing connection entry
1335 cp
= pp
->conn_in_get(af
, skb
, pp
, &iph
, iph
.len
, 0);
1337 if (unlikely(!cp
)) {
1340 /* For local client packets, it could be a response */
1341 cp
= pp
->conn_out_get(af
, skb
, pp
, &iph
, iph
.len
, 0);
1343 return handle_response(af
, skb
, pp
, cp
, iph
.len
);
1345 if (!pp
->conn_schedule(af
, skb
, pp
, &v
, &cp
))
1349 if (unlikely(!cp
)) {
1350 /* sorry, all this trouble for a no-hit :) */
1351 IP_VS_DBG_PKT(12, pp
, skb
, 0,
1352 "packet continues traversal as normal");
1356 IP_VS_DBG_PKT(11, pp
, skb
, 0, "Incoming packet");
1358 /* Check the server status */
1359 if (cp
->dest
&& !(cp
->dest
->flags
& IP_VS_DEST_F_AVAILABLE
)) {
1360 /* the destination server is not available */
1362 if (sysctl_ip_vs_expire_nodest_conn
) {
1363 /* try to expire the connection immediately */
1364 ip_vs_conn_expire_now(cp
);
1366 /* don't restart its timer, and silently
1368 __ip_vs_conn_put(cp
);
1372 ip_vs_in_stats(cp
, skb
);
1373 restart
= ip_vs_set_state(cp
, IP_VS_DIR_INPUT
, skb
, pp
);
1374 if (cp
->packet_xmit
)
1375 ret
= cp
->packet_xmit(skb
, cp
, pp
);
1376 /* do not touch skb anymore */
1378 IP_VS_DBG_RL("warning: packet_xmit is null");
1382 /* Increase its packet counter and check if it is needed
1383 * to be synchronized
1385 * Sync connection if it is about to close to
1386 * encorage the standby servers to update the connections timeout
1388 pkts
= atomic_add_return(1, &cp
->in_pkts
);
1389 if (af
== AF_INET
&& (ip_vs_sync_state
& IP_VS_STATE_MASTER
) &&
1390 cp
->protocol
== IPPROTO_SCTP
) {
1391 if ((cp
->state
== IP_VS_SCTP_S_ESTABLISHED
&&
1392 (atomic_read(&cp
->in_pkts
) %
1393 sysctl_ip_vs_sync_threshold
[1]
1394 == sysctl_ip_vs_sync_threshold
[0])) ||
1395 (cp
->old_state
!= cp
->state
&&
1396 ((cp
->state
== IP_VS_SCTP_S_CLOSED
) ||
1397 (cp
->state
== IP_VS_SCTP_S_SHUT_ACK_CLI
) ||
1398 (cp
->state
== IP_VS_SCTP_S_SHUT_ACK_SER
)))) {
1399 ip_vs_sync_conn(cp
);
1404 if (af
== AF_INET
&&
1405 (ip_vs_sync_state
& IP_VS_STATE_MASTER
) &&
1406 (((cp
->protocol
!= IPPROTO_TCP
||
1407 cp
->state
== IP_VS_TCP_S_ESTABLISHED
) &&
1408 (pkts
% sysctl_ip_vs_sync_threshold
[1]
1409 == sysctl_ip_vs_sync_threshold
[0])) ||
1410 ((cp
->protocol
== IPPROTO_TCP
) && (cp
->old_state
!= cp
->state
) &&
1411 ((cp
->state
== IP_VS_TCP_S_FIN_WAIT
) ||
1412 (cp
->state
== IP_VS_TCP_S_CLOSE
) ||
1413 (cp
->state
== IP_VS_TCP_S_CLOSE_WAIT
) ||
1414 (cp
->state
== IP_VS_TCP_S_TIME_WAIT
)))))
1415 ip_vs_sync_conn(cp
);
1417 cp
->old_state
= cp
->state
;
1425 * It is hooked at the NF_INET_FORWARD chain, in order to catch ICMP
1426 * related packets destined for 0.0.0.0/0.
1427 * When fwmark-based virtual service is used, such as transparent
1428 * cache cluster, TCP packets can be marked and routed to ip_vs_in,
1429 * but ICMP destined for 0.0.0.0/0 cannot not be easily marked and
1430 * sent to ip_vs_in_icmp. So, catch them at the NF_INET_FORWARD chain
1431 * and send them to ip_vs_in_icmp.
1434 ip_vs_forward_icmp(unsigned int hooknum
, struct sk_buff
*skb
,
1435 const struct net_device
*in
, const struct net_device
*out
,
1436 int (*okfn
)(struct sk_buff
*))
1440 if (ip_hdr(skb
)->protocol
!= IPPROTO_ICMP
)
1443 return ip_vs_in_icmp(skb
, &r
, hooknum
);
1446 #ifdef CONFIG_IP_VS_IPV6
1448 ip_vs_forward_icmp_v6(unsigned int hooknum
, struct sk_buff
*skb
,
1449 const struct net_device
*in
, const struct net_device
*out
,
1450 int (*okfn
)(struct sk_buff
*))
1454 if (ipv6_hdr(skb
)->nexthdr
!= IPPROTO_ICMPV6
)
1457 return ip_vs_in_icmp_v6(skb
, &r
, hooknum
);
1462 static struct nf_hook_ops ip_vs_ops
[] __read_mostly
= {
1463 /* After packet filtering, forward packet through VS/DR, VS/TUN,
1464 * or VS/NAT(change destination), so that filtering rules can be
1465 * applied to IPVS. */
1468 .owner
= THIS_MODULE
,
1470 .hooknum
= NF_INET_LOCAL_IN
,
1473 /* After packet filtering, change source only for VS/NAT */
1476 .owner
= THIS_MODULE
,
1478 .hooknum
= NF_INET_FORWARD
,
1481 /* After packet filtering (but before ip_vs_out_icmp), catch icmp
1482 * destined for 0.0.0.0/0, which is for incoming IPVS connections */
1484 .hook
= ip_vs_forward_icmp
,
1485 .owner
= THIS_MODULE
,
1487 .hooknum
= NF_INET_FORWARD
,
1490 /* Before the netfilter connection tracking, exit from POST_ROUTING */
1492 .hook
= ip_vs_post_routing
,
1493 .owner
= THIS_MODULE
,
1495 .hooknum
= NF_INET_POST_ROUTING
,
1496 .priority
= NF_IP_PRI_NAT_SRC
-1,
1498 #ifdef CONFIG_IP_VS_IPV6
1499 /* After packet filtering, forward packet through VS/DR, VS/TUN,
1500 * or VS/NAT(change destination), so that filtering rules can be
1501 * applied to IPVS. */
1504 .owner
= THIS_MODULE
,
1506 .hooknum
= NF_INET_LOCAL_IN
,
1509 /* After packet filtering, change source only for VS/NAT */
1512 .owner
= THIS_MODULE
,
1514 .hooknum
= NF_INET_FORWARD
,
1517 /* After packet filtering (but before ip_vs_out_icmp), catch icmp
1518 * destined for 0.0.0.0/0, which is for incoming IPVS connections */
1520 .hook
= ip_vs_forward_icmp_v6
,
1521 .owner
= THIS_MODULE
,
1523 .hooknum
= NF_INET_FORWARD
,
1526 /* Before the netfilter connection tracking, exit from POST_ROUTING */
1528 .hook
= ip_vs_post_routing
,
1529 .owner
= THIS_MODULE
,
1531 .hooknum
= NF_INET_POST_ROUTING
,
1532 .priority
= NF_IP6_PRI_NAT_SRC
-1,
1539 * Initialize IP Virtual Server
1541 static int __init
ip_vs_init(void)
1545 ip_vs_estimator_init();
1547 ret
= ip_vs_control_init();
1549 pr_err("can't setup control.\n");
1550 goto cleanup_estimator
;
1553 ip_vs_protocol_init();
1555 ret
= ip_vs_app_init();
1557 pr_err("can't setup application helper.\n");
1558 goto cleanup_protocol
;
1561 ret
= ip_vs_conn_init();
1563 pr_err("can't setup connection table.\n");
1567 ret
= nf_register_hooks(ip_vs_ops
, ARRAY_SIZE(ip_vs_ops
));
1569 pr_err("can't register hooks.\n");
1573 pr_info("ipvs loaded.\n");
1577 ip_vs_conn_cleanup();
1579 ip_vs_app_cleanup();
1581 ip_vs_protocol_cleanup();
1582 ip_vs_control_cleanup();
1584 ip_vs_estimator_cleanup();
1588 static void __exit
ip_vs_cleanup(void)
1590 nf_unregister_hooks(ip_vs_ops
, ARRAY_SIZE(ip_vs_ops
));
1591 ip_vs_conn_cleanup();
1592 ip_vs_app_cleanup();
1593 ip_vs_protocol_cleanup();
1594 ip_vs_control_cleanup();
1595 ip_vs_estimator_cleanup();
1596 pr_info("ipvs unloaded.\n");
1599 module_init(ip_vs_init
);
1600 module_exit(ip_vs_cleanup
);
1601 MODULE_LICENSE("GPL");