1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * IPVS An implementation of the IP virtual server support for the
4 * LINUX operating system. IPVS is now implemented as a module
5 * over the Netfilter framework. IPVS can be used to build a
6 * high-performance and highly available server based on a
9 * Authors: Wensong Zhang <wensong@linuxvirtualserver.org>
10 * Peter Kese <peter.kese@ijs.si>
11 * Julian Anastasov <ja@ssi.bg>
13 * The IPVS code for kernel 2.2 was done by Wensong Zhang and Peter Kese,
14 * with changes/fixes from Julian Anastasov, Lars Marowsky-Bree, Horms
18 * Paul `Rusty' Russell properly handle non-linear skbs
19 * Harald Welte don't use nfcache
22 #define KMSG_COMPONENT "IPVS"
23 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
25 #include <linux/module.h>
26 #include <linux/kernel.h>
28 #include <linux/tcp.h>
29 #include <linux/sctp.h>
30 #include <linux/icmp.h>
31 #include <linux/slab.h>
36 #include <net/icmp.h> /* for icmp_send */
39 #include <net/route.h>
40 #include <net/ip6_checksum.h>
41 #include <net/netns/generic.h> /* net_generic() */
43 #include <linux/netfilter.h>
44 #include <linux/netfilter_ipv4.h>
46 #ifdef CONFIG_IP_VS_IPV6
48 #include <linux/netfilter_ipv6.h>
49 #include <net/ip6_route.h>
52 #include <net/ip_vs.h>
53 #include <linux/indirect_call_wrapper.h>
56 EXPORT_SYMBOL(register_ip_vs_scheduler);
57 EXPORT_SYMBOL(unregister_ip_vs_scheduler);
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);
69 EXPORT_SYMBOL(ip_vs_new_conn_out);
71 #if defined(CONFIG_IP_VS_PROTO_TCP) && defined(CONFIG_IP_VS_PROTO_UDP)
72 #define SNAT_CALL(f, ...) \
73 INDIRECT_CALL_2(f, tcp_snat_handler, udp_snat_handler, __VA_ARGS__)
74 #elif defined(CONFIG_IP_VS_PROTO_TCP)
75 #define SNAT_CALL(f, ...) INDIRECT_CALL_1(f, tcp_snat_handler, __VA_ARGS__)
76 #elif defined(CONFIG_IP_VS_PROTO_UDP)
77 #define SNAT_CALL(f, ...) INDIRECT_CALL_1(f, udp_snat_handler, __VA_ARGS__)
79 #define SNAT_CALL(f, ...) f(__VA_ARGS__)
82 static unsigned int ip_vs_net_id __read_mostly;
83 /* netns cnt used for uniqueness */
84 static atomic_t ipvs_netns_cnt = ATOMIC_INIT(0);
86 /* ID used in ICMP lookups */
87 #define icmp_id(icmph) (((icmph)->un).echo.id)
88 #define icmpv6_id(icmph) (icmph->icmp6_dataun.u_echo.identifier)
90 const char *ip_vs_proto_name(unsigned int proto)
105 #ifdef CONFIG_IP_VS_IPV6
110 sprintf(buf, "IP_%u", proto);
115 void ip_vs_init_hash_table(struct list_head *table, int rows)
118 INIT_LIST_HEAD(&table[rows]);
122 ip_vs_in_stats(struct ip_vs_conn *cp, struct sk_buff *skb)
124 struct ip_vs_dest *dest = cp->dest;
125 struct netns_ipvs *ipvs = cp->ipvs;
127 if (dest && (dest->flags & IP_VS_DEST_F_AVAILABLE)) {
128 struct ip_vs_cpu_stats *s;
129 struct ip_vs_service *svc;
133 s = this_cpu_ptr(dest->stats.cpustats);
134 u64_stats_update_begin(&s->syncp);
135 u64_stats_inc(&s->cnt.inpkts);
136 u64_stats_add(&s->cnt.inbytes, skb->len);
137 u64_stats_update_end(&s->syncp);
139 svc = rcu_dereference(dest->svc);
140 s = this_cpu_ptr(svc->stats.cpustats);
141 u64_stats_update_begin(&s->syncp);
142 u64_stats_inc(&s->cnt.inpkts);
143 u64_stats_add(&s->cnt.inbytes, skb->len);
144 u64_stats_update_end(&s->syncp);
146 s = this_cpu_ptr(ipvs->tot_stats->s.cpustats);
147 u64_stats_update_begin(&s->syncp);
148 u64_stats_inc(&s->cnt.inpkts);
149 u64_stats_add(&s->cnt.inbytes, skb->len);
150 u64_stats_update_end(&s->syncp);
158 ip_vs_out_stats(struct ip_vs_conn *cp, struct sk_buff *skb)
160 struct ip_vs_dest *dest = cp->dest;
161 struct netns_ipvs *ipvs = cp->ipvs;
163 if (dest && (dest->flags & IP_VS_DEST_F_AVAILABLE)) {
164 struct ip_vs_cpu_stats *s;
165 struct ip_vs_service *svc;
169 s = this_cpu_ptr(dest->stats.cpustats);
170 u64_stats_update_begin(&s->syncp);
171 u64_stats_inc(&s->cnt.outpkts);
172 u64_stats_add(&s->cnt.outbytes, skb->len);
173 u64_stats_update_end(&s->syncp);
175 svc = rcu_dereference(dest->svc);
176 s = this_cpu_ptr(svc->stats.cpustats);
177 u64_stats_update_begin(&s->syncp);
178 u64_stats_inc(&s->cnt.outpkts);
179 u64_stats_add(&s->cnt.outbytes, skb->len);
180 u64_stats_update_end(&s->syncp);
182 s = this_cpu_ptr(ipvs->tot_stats->s.cpustats);
183 u64_stats_update_begin(&s->syncp);
184 u64_stats_inc(&s->cnt.outpkts);
185 u64_stats_add(&s->cnt.outbytes, skb->len);
186 u64_stats_update_end(&s->syncp);
194 ip_vs_conn_stats(struct ip_vs_conn *cp, struct ip_vs_service *svc)
196 struct netns_ipvs *ipvs = svc->ipvs;
197 struct ip_vs_cpu_stats *s;
201 s = this_cpu_ptr(cp->dest->stats.cpustats);
202 u64_stats_update_begin(&s->syncp);
203 u64_stats_inc(&s->cnt.conns);
204 u64_stats_update_end(&s->syncp);
206 s = this_cpu_ptr(svc->stats.cpustats);
207 u64_stats_update_begin(&s->syncp);
208 u64_stats_inc(&s->cnt.conns);
209 u64_stats_update_end(&s->syncp);
211 s = this_cpu_ptr(ipvs->tot_stats->s.cpustats);
212 u64_stats_update_begin(&s->syncp);
213 u64_stats_inc(&s->cnt.conns);
214 u64_stats_update_end(&s->syncp);
221 ip_vs_set_state(struct ip_vs_conn *cp, int direction,
222 const struct sk_buff *skb,
223 struct ip_vs_proto_data *pd)
225 if (likely(pd->pp->state_transition))
226 pd->pp->state_transition(cp, direction, skb, pd);
230 ip_vs_conn_fill_param_persist(const struct ip_vs_service *svc,
231 struct sk_buff *skb, int protocol,
232 const union nf_inet_addr *caddr, __be16 cport,
233 const union nf_inet_addr *vaddr, __be16 vport,
234 struct ip_vs_conn_param *p)
236 ip_vs_conn_fill_param(svc->ipvs, svc->af, protocol, caddr, cport, vaddr,
238 p->pe = rcu_dereference(svc->pe);
239 if (p->pe && p->pe->fill_param)
240 return p->pe->fill_param(p, skb);
246 * IPVS persistent scheduling function
247 * It creates a connection entry according to its template if exists,
248 * or selects a server and creates a connection entry plus a template.
249 * Locking: we are svc user (svc->refcnt), so we hold all dests too
250 * Protocols supported: TCP, UDP
252 static struct ip_vs_conn *
253 ip_vs_sched_persist(struct ip_vs_service *svc,
254 struct sk_buff *skb, __be16 src_port, __be16 dst_port,
255 int *ignored, struct ip_vs_iphdr *iph)
257 struct ip_vs_conn *cp = NULL;
258 struct ip_vs_dest *dest;
259 struct ip_vs_conn *ct;
260 __be16 dport = 0; /* destination port to forward */
262 struct ip_vs_conn_param param;
263 const union nf_inet_addr fwmark = { .ip = htonl(svc->fwmark) };
264 union nf_inet_addr snet; /* source network of the client,
266 const union nf_inet_addr *src_addr, *dst_addr;
268 if (likely(!ip_vs_iph_inverse(iph))) {
269 src_addr = &iph->saddr;
270 dst_addr = &iph->daddr;
272 src_addr = &iph->daddr;
273 dst_addr = &iph->saddr;
277 /* Mask saddr with the netmask to adjust template granularity */
278 #ifdef CONFIG_IP_VS_IPV6
279 if (svc->af == AF_INET6)
280 ipv6_addr_prefix(&snet.in6, &src_addr->in6,
281 (__force __u32) svc->netmask);
284 snet.ip = src_addr->ip & svc->netmask;
286 IP_VS_DBG_BUF(6, "p-schedule: src %s:%u dest %s:%u "
288 IP_VS_DBG_ADDR(svc->af, src_addr), ntohs(src_port),
289 IP_VS_DBG_ADDR(svc->af, dst_addr), ntohs(dst_port),
290 IP_VS_DBG_ADDR(svc->af, &snet));
293 * As far as we know, FTP is a very complicated network protocol, and
294 * it uses control connection and data connections. For active FTP,
295 * FTP server initialize data connection to the client, its source port
296 * is often 20. For passive FTP, FTP server tells the clients the port
297 * that it passively listens to, and the client issues the data
298 * connection. In the tunneling or direct routing mode, the load
299 * balancer is on the client-to-server half of connection, the port
300 * number is unknown to the load balancer. So, a conn template like
301 * <caddr, 0, vaddr, 0, daddr, 0> is created for persistent FTP
302 * service, and a template like <caddr, 0, vaddr, vport, daddr, dport>
303 * is created for other persistent services.
306 int protocol = iph->protocol;
307 const union nf_inet_addr *vaddr = dst_addr;
310 if (dst_port == svc->port) {
312 * <protocol, caddr, 0, vaddr, vport, daddr, dport>
314 * <protocol, caddr, 0, vaddr, 0, daddr, 0>
316 if (svc->port != FTPPORT)
319 /* Note: persistent fwmark-based services and
320 * persistent port zero service are handled here.
322 * <IPPROTO_IP,caddr,0,fwmark,0,daddr,0>
323 * port zero template:
324 * <protocol,caddr,0,vaddr,0,daddr,0>
327 protocol = IPPROTO_IP;
331 /* return *ignored = -1 so NF_DROP can be used */
332 if (ip_vs_conn_fill_param_persist(svc, skb, protocol, &snet, 0,
333 vaddr, vport, ¶m) < 0) {
339 /* Check if a template already exists */
340 ct = ip_vs_ct_in_get(¶m);
341 if (!ct || !ip_vs_check_template(ct, NULL)) {
342 struct ip_vs_scheduler *sched;
345 * No template found or the dest of the connection
346 * template is not available.
347 * return *ignored=0 i.e. ICMP and NF_DROP
349 sched = rcu_dereference(svc->scheduler);
351 /* read svc->sched_data after svc->scheduler */
353 dest = sched->schedule(svc, skb, iph);
358 IP_VS_DBG(1, "p-schedule: no dest found.\n");
359 kfree(param.pe_data);
364 if (dst_port == svc->port && svc->port != FTPPORT)
368 * This adds param.pe_data to the template,
369 * and thus param.pe_data will be destroyed
370 * when the template expires */
371 ct = ip_vs_conn_new(¶m, dest->af, &dest->addr, dport,
372 IP_VS_CONN_F_TEMPLATE, dest, skb->mark);
374 kfree(param.pe_data);
379 ct->timeout = svc->timeout;
381 /* set destination with the found template */
383 kfree(param.pe_data);
387 if (dport == svc->port && dest->port)
390 flags = (svc->flags & IP_VS_SVC_F_ONEPACKET
391 && iph->protocol == IPPROTO_UDP) ?
392 IP_VS_CONN_F_ONE_PACKET : 0;
395 * Create a new connection according to the template
397 ip_vs_conn_fill_param(svc->ipvs, svc->af, iph->protocol, src_addr,
398 src_port, dst_addr, dst_port, ¶m);
400 cp = ip_vs_conn_new(¶m, dest->af, &dest->addr, dport, flags, dest,
411 ip_vs_control_add(cp, ct);
414 ip_vs_conn_stats(cp, svc);
420 * IPVS main scheduling function
421 * It selects a server according to the virtual service, and
422 * creates a connection entry.
423 * Protocols supported: TCP, UDP
427 * 1 : protocol tried to schedule (eg. on SYN), found svc but the
428 * svc/scheduler decides that this packet should be accepted with
429 * NF_ACCEPT because it must not be scheduled.
431 * 0 : scheduler can not find destination, so try bypass or
432 * return ICMP and then NF_DROP (ip_vs_leave).
434 * -1 : scheduler tried to schedule but fatal error occurred, eg.
435 * ip_vs_conn_new failure (ENOMEM) or ip_vs_sip_fill_param
436 * failure such as missing Call-ID, ENOMEM on skb_linearize
437 * or pe_data. In this case we should return NF_DROP without
438 * any attempts to send ICMP with ip_vs_leave.
441 ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb,
442 struct ip_vs_proto_data *pd, int *ignored,
443 struct ip_vs_iphdr *iph)
445 struct ip_vs_protocol *pp = pd->pp;
446 struct ip_vs_conn *cp = NULL;
447 struct ip_vs_scheduler *sched;
448 struct ip_vs_dest *dest;
449 __be16 _ports[2], *pptr, cport, vport;
450 const void *caddr, *vaddr;
455 * IPv6 frags, only the first hit here.
457 pptr = frag_safe_skb_hp(skb, iph->len, sizeof(_ports), _ports);
461 if (likely(!ip_vs_iph_inverse(iph))) {
474 * FTPDATA needs this check when using local real server.
475 * Never schedule Active FTPDATA connections from real server.
476 * For LVS-NAT they must be already created. For other methods
477 * with persistence the connection is created on SYN+ACK.
479 if (cport == FTPDATA) {
480 IP_VS_DBG_PKT(12, svc->af, pp, skb, iph->off,
481 "Not scheduling FTPDATA");
486 * Do not schedule replies from local real server.
488 if ((!skb->dev || skb->dev->flags & IFF_LOOPBACK)) {
489 iph->hdr_flags ^= IP_VS_HDR_INVERSE;
490 cp = INDIRECT_CALL_1(pp->conn_in_get,
491 ip_vs_conn_in_get_proto, svc->ipvs,
493 iph->hdr_flags ^= IP_VS_HDR_INVERSE;
496 IP_VS_DBG_PKT(12, svc->af, pp, skb, iph->off,
497 "Not scheduling reply for existing"
499 __ip_vs_conn_put(cp);
507 if (svc->flags & IP_VS_SVC_F_PERSISTENT)
508 return ip_vs_sched_persist(svc, skb, cport, vport, ignored,
514 * Non-persistent service
516 if (!svc->fwmark && vport != svc->port) {
518 pr_err("Schedule: port zero only supported "
519 "in persistent services, "
520 "check your ipvs configuration\n");
524 sched = rcu_dereference(svc->scheduler);
526 /* read svc->sched_data after svc->scheduler */
528 dest = sched->schedule(svc, skb, iph);
533 IP_VS_DBG(1, "Schedule: no dest found.\n");
537 flags = (svc->flags & IP_VS_SVC_F_ONEPACKET
538 && iph->protocol == IPPROTO_UDP) ?
539 IP_VS_CONN_F_ONE_PACKET : 0;
542 * Create a connection entry.
545 struct ip_vs_conn_param p;
547 ip_vs_conn_fill_param(svc->ipvs, svc->af, iph->protocol,
548 caddr, cport, vaddr, vport, &p);
549 cp = ip_vs_conn_new(&p, dest->af, &dest->addr,
550 dest->port ? dest->port : vport,
551 flags, dest, skb->mark);
558 IP_VS_DBG_BUF(6, "Schedule fwd:%c c:%s:%u v:%s:%u "
559 "d:%s:%u conn->flags:%X conn->refcnt:%d\n",
561 IP_VS_DBG_ADDR(cp->af, &cp->caddr), ntohs(cp->cport),
562 IP_VS_DBG_ADDR(cp->af, &cp->vaddr), ntohs(cp->vport),
563 IP_VS_DBG_ADDR(cp->daf, &cp->daddr), ntohs(cp->dport),
564 cp->flags, refcount_read(&cp->refcnt));
566 ip_vs_conn_stats(cp, svc);
570 static inline int ip_vs_addr_is_unicast(struct net *net, int af,
571 union nf_inet_addr *addr)
573 #ifdef CONFIG_IP_VS_IPV6
575 return ipv6_addr_type(&addr->in6) & IPV6_ADDR_UNICAST;
577 return (inet_addr_type(net, addr->ip) == RTN_UNICAST);
581 * Pass or drop the packet.
582 * Called by ip_vs_in, when the virtual service is available but
583 * no destination is available for a new connection.
585 int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
586 struct ip_vs_proto_data *pd, struct ip_vs_iphdr *iph)
588 __be16 _ports[2], *pptr, dport;
589 struct netns_ipvs *ipvs = svc->ipvs;
590 struct net *net = ipvs->net;
592 pptr = frag_safe_skb_hp(skb, iph->len, sizeof(_ports), _ports);
595 dport = likely(!ip_vs_iph_inverse(iph)) ? pptr[1] : pptr[0];
597 /* if it is fwmark-based service, the cache_bypass sysctl is up
598 and the destination is a non-local unicast, then create
599 a cache_bypass connection entry */
600 if (sysctl_cache_bypass(ipvs) && svc->fwmark &&
601 !(iph->hdr_flags & (IP_VS_HDR_INVERSE | IP_VS_HDR_ICMP)) &&
602 ip_vs_addr_is_unicast(net, svc->af, &iph->daddr)) {
604 struct ip_vs_conn *cp;
605 unsigned int flags = (svc->flags & IP_VS_SVC_F_ONEPACKET &&
606 iph->protocol == IPPROTO_UDP) ?
607 IP_VS_CONN_F_ONE_PACKET : 0;
608 union nf_inet_addr daddr = { .all = { 0, 0, 0, 0 } };
610 /* create a new connection entry */
611 IP_VS_DBG(6, "%s(): create a cache_bypass entry\n", __func__);
613 struct ip_vs_conn_param p;
614 ip_vs_conn_fill_param(svc->ipvs, svc->af, iph->protocol,
615 &iph->saddr, pptr[0],
616 &iph->daddr, pptr[1], &p);
617 cp = ip_vs_conn_new(&p, svc->af, &daddr, 0,
618 IP_VS_CONN_F_BYPASS | flags,
625 ip_vs_in_stats(cp, skb);
628 ip_vs_set_state(cp, IP_VS_DIR_INPUT, skb, pd);
630 /* transmit the first SYN packet */
631 ret = cp->packet_xmit(skb, cp, pd->pp, iph);
632 /* do not touch skb anymore */
634 if ((cp->flags & IP_VS_CONN_F_ONE_PACKET) && cp->control)
635 atomic_inc(&cp->control->in_pkts);
637 atomic_inc(&cp->in_pkts);
643 * When the virtual ftp service is presented, packets destined
644 * for other services on the VIP may get here (except services
645 * listed in the ipvs table), pass the packets, because it is
646 * not ipvs job to decide to drop the packets.
648 if (svc->port == FTPPORT && dport != FTPPORT)
651 if (unlikely(ip_vs_iph_icmp(iph)))
655 * Notify the client that the destination is unreachable, and
656 * release the socket buffer.
657 * Since it is in IP layer, the TCP socket is not actually
658 * created, the TCP RST packet cannot be sent, instead that
659 * ICMP_PORT_UNREACH is sent here no matter it is TCP/UDP. --WZ
661 #ifdef CONFIG_IP_VS_IPV6
662 if (svc->af == AF_INET6) {
664 skb->dev = net->loopback_dev;
665 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
668 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
675 static int sysctl_snat_reroute(struct netns_ipvs *ipvs)
677 return ipvs->sysctl_snat_reroute;
680 static int sysctl_nat_icmp_send(struct netns_ipvs *ipvs)
682 return ipvs->sysctl_nat_icmp_send;
687 static int sysctl_snat_reroute(struct netns_ipvs *ipvs) { return 0; }
688 static int sysctl_nat_icmp_send(struct netns_ipvs *ipvs) { return 0; }
692 __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset)
694 return csum_fold(skb_checksum(skb, offset, skb->len - offset, 0));
697 static inline enum ip_defrag_users ip_vs_defrag_user(unsigned int hooknum)
699 if (NF_INET_LOCAL_IN == hooknum)
700 return IP_DEFRAG_VS_IN;
701 if (NF_INET_FORWARD == hooknum)
702 return IP_DEFRAG_VS_FWD;
703 return IP_DEFRAG_VS_OUT;
706 static inline int ip_vs_gather_frags(struct netns_ipvs *ipvs,
707 struct sk_buff *skb, u_int32_t user)
712 err = ip_defrag(ipvs->net, skb, user);
715 ip_send_check(ip_hdr(skb));
720 static int ip_vs_route_me_harder(struct netns_ipvs *ipvs, int af,
721 struct sk_buff *skb, unsigned int hooknum)
723 if (!sysctl_snat_reroute(ipvs))
725 /* Reroute replies only to remote clients (FORWARD and LOCAL_OUT) */
726 if (NF_INET_LOCAL_IN == hooknum)
728 #ifdef CONFIG_IP_VS_IPV6
729 if (af == AF_INET6) {
730 struct dst_entry *dst = skb_dst(skb);
732 if (dst->dev && !(dst->dev->flags & IFF_LOOPBACK) &&
733 ip6_route_me_harder(ipvs->net, skb->sk, skb) != 0)
737 if (!(skb_rtable(skb)->rt_flags & RTCF_LOCAL) &&
738 ip_route_me_harder(ipvs->net, skb->sk, skb, RTN_LOCAL) != 0)
745 * Packet has been made sufficiently writable in caller
746 * - inout: 1=in->out, 0=out->in
748 void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp,
749 struct ip_vs_conn *cp, int inout)
751 struct iphdr *iph = ip_hdr(skb);
752 unsigned int icmp_offset = iph->ihl*4;
753 struct icmphdr *icmph = (struct icmphdr *)(skb_network_header(skb) +
755 struct iphdr *ciph = (struct iphdr *)(icmph + 1);
758 iph->saddr = cp->vaddr.ip;
760 ciph->daddr = cp->vaddr.ip;
763 iph->daddr = cp->daddr.ip;
765 ciph->saddr = cp->daddr.ip;
769 /* the TCP/UDP/SCTP port */
770 if (IPPROTO_TCP == ciph->protocol || IPPROTO_UDP == ciph->protocol ||
771 IPPROTO_SCTP == ciph->protocol) {
772 __be16 *ports = (void *)ciph + ciph->ihl*4;
775 ports[1] = cp->vport;
777 ports[0] = cp->dport;
780 /* And finally the ICMP checksum */
782 icmph->checksum = ip_vs_checksum_complete(skb, icmp_offset);
783 skb->ip_summed = CHECKSUM_UNNECESSARY;
786 IP_VS_DBG_PKT(11, AF_INET, pp, skb, (void *)ciph - (void *)iph,
787 "Forwarding altered outgoing ICMP");
789 IP_VS_DBG_PKT(11, AF_INET, pp, skb, (void *)ciph - (void *)iph,
790 "Forwarding altered incoming ICMP");
793 #ifdef CONFIG_IP_VS_IPV6
794 void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp,
795 struct ip_vs_conn *cp, int inout)
797 struct ipv6hdr *iph = ipv6_hdr(skb);
798 unsigned int icmp_offset = 0;
799 unsigned int offs = 0; /* header offset*/
801 struct icmp6hdr *icmph;
802 struct ipv6hdr *ciph;
803 unsigned short fragoffs;
805 ipv6_find_hdr(skb, &icmp_offset, IPPROTO_ICMPV6, &fragoffs, NULL);
806 icmph = (struct icmp6hdr *)(skb_network_header(skb) + icmp_offset);
807 offs = icmp_offset + sizeof(struct icmp6hdr);
808 ciph = (struct ipv6hdr *)(skb_network_header(skb) + offs);
810 protocol = ipv6_find_hdr(skb, &offs, -1, &fragoffs, NULL);
813 iph->saddr = cp->vaddr.in6;
814 ciph->daddr = cp->vaddr.in6;
816 iph->daddr = cp->daddr.in6;
817 ciph->saddr = cp->daddr.in6;
820 /* the TCP/UDP/SCTP port */
821 if (!fragoffs && (IPPROTO_TCP == protocol || IPPROTO_UDP == protocol ||
822 IPPROTO_SCTP == protocol)) {
823 __be16 *ports = (void *)(skb_network_header(skb) + offs);
825 IP_VS_DBG(11, "%s() changed port %d to %d\n", __func__,
826 ntohs(inout ? ports[1] : ports[0]),
827 ntohs(inout ? cp->vport : cp->dport));
829 ports[1] = cp->vport;
831 ports[0] = cp->dport;
834 /* And finally the ICMP checksum */
835 icmph->icmp6_cksum = ~csum_ipv6_magic(&iph->saddr, &iph->daddr,
836 skb->len - icmp_offset,
838 skb->csum_start = skb_network_header(skb) - skb->head + icmp_offset;
839 skb->csum_offset = offsetof(struct icmp6hdr, icmp6_cksum);
840 skb->ip_summed = CHECKSUM_PARTIAL;
843 IP_VS_DBG_PKT(11, AF_INET6, pp, skb,
844 (void *)ciph - (void *)iph,
845 "Forwarding altered outgoing ICMPv6");
847 IP_VS_DBG_PKT(11, AF_INET6, pp, skb,
848 (void *)ciph - (void *)iph,
849 "Forwarding altered incoming ICMPv6");
853 /* Handle relevant response ICMP messages - forward to the right
856 static int handle_response_icmp(int af, struct sk_buff *skb,
857 union nf_inet_addr *snet,
858 __u8 protocol, struct ip_vs_conn *cp,
859 struct ip_vs_protocol *pp,
860 unsigned int offset, unsigned int ihl,
861 unsigned int hooknum)
863 unsigned int verdict = NF_DROP;
865 if (IP_VS_FWD_METHOD(cp) != IP_VS_CONN_F_MASQ)
868 /* Ensure the checksum is correct */
869 if (!skb_csum_unnecessary(skb) && ip_vs_checksum_complete(skb, ihl)) {
870 /* Failed checksum! */
871 IP_VS_DBG_BUF(1, "Forward ICMP: failed checksum from %s!\n",
872 IP_VS_DBG_ADDR(af, snet));
876 if (IPPROTO_TCP == protocol || IPPROTO_UDP == protocol ||
877 IPPROTO_SCTP == protocol)
878 offset += 2 * sizeof(__u16);
879 if (skb_ensure_writable(skb, offset))
882 #ifdef CONFIG_IP_VS_IPV6
884 ip_vs_nat_icmp_v6(skb, pp, cp, 1);
887 ip_vs_nat_icmp(skb, pp, cp, 1);
889 if (ip_vs_route_me_harder(cp->ipvs, af, skb, hooknum))
893 /* do the statistics and put it back */
894 ip_vs_out_stats(cp, skb);
896 skb->ipvs_property = 1;
897 if (!(cp->flags & IP_VS_CONN_F_NFCT))
900 ip_vs_update_conntrack(skb, cp, 0);
904 __ip_vs_conn_put(cp);
910 * Handle ICMP messages in the inside-to-outside direction (outgoing).
911 * Find any that might be relevant, check against existing connections.
912 * Currently handles error types - unreachable, quench, ttl exceeded.
914 static int ip_vs_out_icmp(struct netns_ipvs *ipvs, struct sk_buff *skb,
915 int *related, unsigned int hooknum)
918 struct icmphdr _icmph, *ic;
919 struct iphdr _ciph, *cih; /* The ip header contained within the ICMP */
920 struct ip_vs_iphdr ciph;
921 struct ip_vs_conn *cp;
922 struct ip_vs_protocol *pp;
923 unsigned int offset, ihl;
924 union nf_inet_addr snet;
928 /* reassemble IP fragments */
929 if (ip_is_fragment(ip_hdr(skb))) {
930 if (ip_vs_gather_frags(ipvs, skb, ip_vs_defrag_user(hooknum)))
935 offset = ihl = iph->ihl * 4;
936 ic = skb_header_pointer(skb, offset, sizeof(_icmph), &_icmph);
940 IP_VS_DBG(12, "Outgoing ICMP (%d,%d) %pI4->%pI4\n",
941 ic->type, ntohs(icmp_id(ic)),
942 &iph->saddr, &iph->daddr);
945 * Work through seeing if this is for us.
946 * These checks are supposed to be in an order that means easy
947 * things are checked first to speed up processing.... however
948 * this means that some packets will manage to get a long way
949 * down this stack and then be rejected, but that's life.
951 if ((ic->type != ICMP_DEST_UNREACH) &&
952 (ic->type != ICMP_SOURCE_QUENCH) &&
953 (ic->type != ICMP_TIME_EXCEEDED)) {
958 /* Now find the contained IP header */
959 offset += sizeof(_icmph);
960 cih = skb_header_pointer(skb, offset, sizeof(_ciph), &_ciph);
962 return NF_ACCEPT; /* The packet looks wrong, ignore */
964 pp = ip_vs_proto_get(cih->protocol);
968 /* Is the embedded protocol header present? */
969 if (unlikely(cih->frag_off & htons(IP_OFFSET) &&
973 IP_VS_DBG_PKT(11, AF_INET, pp, skb, offset,
974 "Checking outgoing ICMP for");
976 ip_vs_fill_iph_skb_icmp(AF_INET, skb, offset, true, &ciph);
978 /* The embedded headers contain source and dest in reverse order */
979 cp = INDIRECT_CALL_1(pp->conn_out_get, ip_vs_conn_out_get_proto,
980 ipvs, AF_INET, skb, &ciph);
984 snet.ip = iph->saddr;
985 return handle_response_icmp(AF_INET, skb, &snet, cih->protocol, cp,
986 pp, ciph.len, ihl, hooknum);
989 #ifdef CONFIG_IP_VS_IPV6
990 static int ip_vs_out_icmp_v6(struct netns_ipvs *ipvs, struct sk_buff *skb,
991 int *related, unsigned int hooknum,
992 struct ip_vs_iphdr *ipvsh)
994 struct icmp6hdr _icmph, *ic;
995 struct ip_vs_iphdr ciph = {.flags = 0, .fragoffs = 0};/*Contained IP */
996 struct ip_vs_conn *cp;
997 struct ip_vs_protocol *pp;
998 union nf_inet_addr snet;
1002 ic = frag_safe_skb_hp(skb, ipvsh->len, sizeof(_icmph), &_icmph);
1007 * Work through seeing if this is for us.
1008 * These checks are supposed to be in an order that means easy
1009 * things are checked first to speed up processing.... however
1010 * this means that some packets will manage to get a long way
1011 * down this stack and then be rejected, but that's life.
1013 if (ic->icmp6_type & ICMPV6_INFOMSG_MASK) {
1017 /* Fragment header that is before ICMP header tells us that:
1018 * it's not an error message since they can't be fragmented.
1020 if (ipvsh->flags & IP6_FH_F_FRAG)
1023 IP_VS_DBG(8, "Outgoing ICMPv6 (%d,%d) %pI6c->%pI6c\n",
1024 ic->icmp6_type, ntohs(icmpv6_id(ic)),
1025 &ipvsh->saddr, &ipvsh->daddr);
1027 if (!ip_vs_fill_iph_skb_icmp(AF_INET6, skb, ipvsh->len + sizeof(_icmph),
1029 return NF_ACCEPT; /* The packet looks wrong, ignore */
1031 pp = ip_vs_proto_get(ciph.protocol);
1035 /* The embedded headers contain source and dest in reverse order */
1036 cp = INDIRECT_CALL_1(pp->conn_out_get, ip_vs_conn_out_get_proto,
1037 ipvs, AF_INET6, skb, &ciph);
1041 snet.in6 = ciph.saddr.in6;
1043 return handle_response_icmp(AF_INET6, skb, &snet, ciph.protocol, cp,
1044 pp, offset, sizeof(struct ipv6hdr),
1050 * Check if sctp chunc is ABORT chunk
1052 static inline int is_sctp_abort(const struct sk_buff *skb, int nh_len)
1054 struct sctp_chunkhdr *sch, schunk;
1055 sch = skb_header_pointer(skb, nh_len + sizeof(struct sctphdr),
1056 sizeof(schunk), &schunk);
1059 if (sch->type == SCTP_CID_ABORT)
1064 static inline int is_tcp_reset(const struct sk_buff *skb, int nh_len)
1066 struct tcphdr _tcph, *th;
1068 th = skb_header_pointer(skb, nh_len, sizeof(_tcph), &_tcph);
1074 static inline bool is_new_conn(const struct sk_buff *skb,
1075 struct ip_vs_iphdr *iph)
1077 switch (iph->protocol) {
1079 struct tcphdr _tcph, *th;
1081 th = skb_header_pointer(skb, iph->len, sizeof(_tcph), &_tcph);
1086 case IPPROTO_SCTP: {
1087 struct sctp_chunkhdr *sch, schunk;
1089 sch = skb_header_pointer(skb, iph->len + sizeof(struct sctphdr),
1090 sizeof(schunk), &schunk);
1093 return sch->type == SCTP_CID_INIT;
1100 static inline bool is_new_conn_expected(const struct ip_vs_conn *cp,
1101 int conn_reuse_mode)
1103 /* Controlled (FTP DATA or persistence)? */
1107 switch (cp->protocol) {
1109 return (cp->state == IP_VS_TCP_S_TIME_WAIT) ||
1110 (cp->state == IP_VS_TCP_S_CLOSE) ||
1111 ((conn_reuse_mode & 2) &&
1112 (cp->state == IP_VS_TCP_S_FIN_WAIT) &&
1113 (cp->flags & IP_VS_CONN_F_NOOUTPUT));
1115 return cp->state == IP_VS_SCTP_S_CLOSED;
1121 /* Generic function to create new connections for outgoing RS packets
1123 * Pre-requisites for successful connection creation:
1124 * 1) Virtual Service is NOT fwmark based:
1125 * In fwmark-VS actual vaddr and vport are unknown to IPVS
1126 * 2) Real Server and Virtual Service were NOT configured without port:
1127 * This is to allow match of different VS to the same RS ip-addr
1129 struct ip_vs_conn *ip_vs_new_conn_out(struct ip_vs_service *svc,
1130 struct ip_vs_dest *dest,
1131 struct sk_buff *skb,
1132 const struct ip_vs_iphdr *iph,
1136 struct ip_vs_conn_param param;
1137 struct ip_vs_conn *ct = NULL, *cp = NULL;
1138 const union nf_inet_addr *vaddr, *daddr, *caddr;
1139 union nf_inet_addr snet;
1145 daddr = &iph->saddr;
1146 caddr = &iph->daddr;
1148 /* check pre-requisites are satisfied */
1151 if (!vport || !dport)
1154 /* for persistent service first create connection template */
1155 if (svc->flags & IP_VS_SVC_F_PERSISTENT) {
1156 /* apply netmask the same way ingress-side does */
1157 #ifdef CONFIG_IP_VS_IPV6
1158 if (svc->af == AF_INET6)
1159 ipv6_addr_prefix(&snet.in6, &caddr->in6,
1160 (__force __u32)svc->netmask);
1163 snet.ip = caddr->ip & svc->netmask;
1164 /* fill params and create template if not existent */
1165 if (ip_vs_conn_fill_param_persist(svc, skb, iph->protocol,
1169 ct = ip_vs_ct_in_get(¶m);
1170 /* check if template exists and points to the same dest */
1171 if (!ct || !ip_vs_check_template(ct, dest)) {
1172 ct = ip_vs_conn_new(¶m, dest->af, daddr, dport,
1173 IP_VS_CONN_F_TEMPLATE, dest, 0);
1175 kfree(param.pe_data);
1178 ct->timeout = svc->timeout;
1180 kfree(param.pe_data);
1184 /* connection flags */
1185 flags = ((svc->flags & IP_VS_SVC_F_ONEPACKET) &&
1186 iph->protocol == IPPROTO_UDP) ? IP_VS_CONN_F_ONE_PACKET : 0;
1187 /* create connection */
1188 ip_vs_conn_fill_param(svc->ipvs, svc->af, iph->protocol,
1189 caddr, cport, vaddr, vport, ¶m);
1190 cp = ip_vs_conn_new(¶m, dest->af, daddr, dport, flags, dest, 0);
1197 ip_vs_control_add(cp, ct);
1200 ip_vs_conn_stats(cp, svc);
1202 /* return connection (will be used to handle outgoing packet) */
1203 IP_VS_DBG_BUF(6, "New connection RS-initiated:%c c:%s:%u v:%s:%u "
1204 "d:%s:%u conn->flags:%X conn->refcnt:%d\n",
1206 IP_VS_DBG_ADDR(cp->af, &cp->caddr), ntohs(cp->cport),
1207 IP_VS_DBG_ADDR(cp->af, &cp->vaddr), ntohs(cp->vport),
1208 IP_VS_DBG_ADDR(cp->af, &cp->daddr), ntohs(cp->dport),
1209 cp->flags, refcount_read(&cp->refcnt));
1213 /* Handle outgoing packets which are considered requests initiated by
1214 * real servers, so that subsequent responses from external client can be
1215 * routed to the right real server.
1216 * Used also for outgoing responses in OPS mode.
1218 * Connection management is handled by persistent-engine specific callback.
1220 static struct ip_vs_conn *__ip_vs_rs_conn_out(unsigned int hooknum,
1221 struct netns_ipvs *ipvs,
1222 int af, struct sk_buff *skb,
1223 const struct ip_vs_iphdr *iph)
1225 struct ip_vs_dest *dest;
1226 struct ip_vs_conn *cp = NULL;
1227 __be16 _ports[2], *pptr;
1229 if (hooknum == NF_INET_LOCAL_IN)
1232 pptr = frag_safe_skb_hp(skb, iph->len,
1233 sizeof(_ports), _ports);
1237 dest = ip_vs_find_real_service(ipvs, af, iph->protocol,
1238 &iph->saddr, pptr[0]);
1240 struct ip_vs_service *svc;
1241 struct ip_vs_pe *pe;
1243 svc = rcu_dereference(dest->svc);
1245 pe = rcu_dereference(svc->pe);
1246 if (pe && pe->conn_out)
1247 cp = pe->conn_out(svc, dest, skb, iph,
1255 /* Handle response packets: rewrite addresses and send away...
1258 handle_response(int af, struct sk_buff *skb, struct ip_vs_proto_data *pd,
1259 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph,
1260 unsigned int hooknum)
1262 struct ip_vs_protocol *pp = pd->pp;
1264 if (IP_VS_FWD_METHOD(cp) != IP_VS_CONN_F_MASQ)
1267 IP_VS_DBG_PKT(11, af, pp, skb, iph->off, "Outgoing packet");
1269 if (skb_ensure_writable(skb, iph->len))
1272 /* mangle the packet */
1273 if (pp->snat_handler &&
1274 !SNAT_CALL(pp->snat_handler, skb, pp, cp, iph))
1277 #ifdef CONFIG_IP_VS_IPV6
1279 ipv6_hdr(skb)->saddr = cp->vaddr.in6;
1283 ip_hdr(skb)->saddr = cp->vaddr.ip;
1284 ip_send_check(ip_hdr(skb));
1288 * nf_iterate does not expect change in the skb->dst->dev.
1289 * It looks like it is not fatal to enable this code for hooks
1290 * where our handlers are at the end of the chain list and
1291 * when all next handlers use skb->dst->dev and not outdev.
1292 * It will definitely route properly the inout NAT traffic
1293 * when multiple paths are used.
1296 /* For policy routing, packets originating from this
1297 * machine itself may be routed differently to packets
1298 * passing through. We want this packet to be routed as
1299 * if it came from this machine itself. So re-compute
1300 * the routing information.
1302 if (ip_vs_route_me_harder(cp->ipvs, af, skb, hooknum))
1305 IP_VS_DBG_PKT(10, af, pp, skb, iph->off, "After SNAT");
1308 ip_vs_out_stats(cp, skb);
1309 ip_vs_set_state(cp, IP_VS_DIR_OUTPUT, skb, pd);
1310 skb->ipvs_property = 1;
1311 if (!(cp->flags & IP_VS_CONN_F_NFCT))
1314 ip_vs_update_conntrack(skb, cp, 0);
1326 * Check if outgoing packet belongs to the established ip_vs_conn.
1329 ip_vs_out_hook(void *priv, struct sk_buff *skb, const struct nf_hook_state *state)
1331 struct netns_ipvs *ipvs = net_ipvs(state->net);
1332 unsigned int hooknum = state->hook;
1333 struct ip_vs_iphdr iph;
1334 struct ip_vs_protocol *pp;
1335 struct ip_vs_proto_data *pd;
1336 struct ip_vs_conn *cp;
1340 /* Already marked as IPVS request or reply? */
1341 if (skb->ipvs_property)
1344 sk = skb_to_full_sk(skb);
1345 /* Bad... Do not break raw sockets */
1346 if (unlikely(sk && hooknum == NF_INET_LOCAL_OUT &&
1349 if (sk->sk_family == PF_INET && inet_test_bit(NODEFRAG, sk))
1353 if (unlikely(!skb_dst(skb)))
1359 ip_vs_fill_iph_skb(af, skb, false, &iph);
1360 #ifdef CONFIG_IP_VS_IPV6
1361 if (af == AF_INET6) {
1362 if (unlikely(iph.protocol == IPPROTO_ICMPV6)) {
1364 int verdict = ip_vs_out_icmp_v6(ipvs, skb, &related,
1372 if (unlikely(iph.protocol == IPPROTO_ICMP)) {
1374 int verdict = ip_vs_out_icmp(ipvs, skb, &related, hooknum);
1380 pd = ip_vs_proto_data_get(ipvs, iph.protocol);
1385 /* reassemble IP fragments */
1386 #ifdef CONFIG_IP_VS_IPV6
1389 if (unlikely(ip_is_fragment(ip_hdr(skb)) && !pp->dont_defrag)) {
1390 if (ip_vs_gather_frags(ipvs, skb,
1391 ip_vs_defrag_user(hooknum)))
1394 ip_vs_fill_iph_skb(AF_INET, skb, false, &iph);
1398 * Check if the packet belongs to an existing entry
1400 cp = INDIRECT_CALL_1(pp->conn_out_get, ip_vs_conn_out_get_proto,
1401 ipvs, af, skb, &iph);
1404 return handle_response(af, skb, pd, cp, &iph, hooknum);
1406 /* Check for real-server-started requests */
1407 if (atomic_read(&ipvs->conn_out_counter)) {
1408 /* Currently only for UDP:
1409 * connection oriented protocols typically use
1410 * ephemeral ports for outgoing connections, so
1411 * related incoming responses would not match any VS
1413 if (pp->protocol == IPPROTO_UDP) {
1414 cp = __ip_vs_rs_conn_out(hooknum, ipvs, af, skb, &iph);
1416 return handle_response(af, skb, pd, cp, &iph,
1421 if (sysctl_nat_icmp_send(ipvs) &&
1422 (pp->protocol == IPPROTO_TCP ||
1423 pp->protocol == IPPROTO_UDP ||
1424 pp->protocol == IPPROTO_SCTP)) {
1425 __be16 _ports[2], *pptr;
1427 pptr = frag_safe_skb_hp(skb, iph.len,
1428 sizeof(_ports), _ports);
1430 return NF_ACCEPT; /* Not for me */
1431 if (ip_vs_has_real_service(ipvs, af, iph.protocol, &iph.saddr,
1434 * Notify the real server: there is no
1435 * existing entry if it is not RST
1436 * packet or not TCP packet.
1438 if ((iph.protocol != IPPROTO_TCP &&
1439 iph.protocol != IPPROTO_SCTP)
1440 || ((iph.protocol == IPPROTO_TCP
1441 && !is_tcp_reset(skb, iph.len))
1442 || (iph.protocol == IPPROTO_SCTP
1443 && !is_sctp_abort(skb,
1445 #ifdef CONFIG_IP_VS_IPV6
1446 if (af == AF_INET6) {
1448 skb->dev = ipvs->net->loopback_dev;
1450 ICMPV6_DEST_UNREACH,
1451 ICMPV6_PORT_UNREACH,
1457 ICMP_PORT_UNREACH, 0);
1463 IP_VS_DBG_PKT(12, af, pp, skb, iph.off,
1464 "ip_vs_out: packet continues traversal as normal");
1469 ip_vs_try_to_schedule(struct netns_ipvs *ipvs, int af, struct sk_buff *skb,
1470 struct ip_vs_proto_data *pd,
1471 int *verdict, struct ip_vs_conn **cpp,
1472 struct ip_vs_iphdr *iph)
1474 struct ip_vs_protocol *pp = pd->pp;
1476 if (!iph->fragoffs) {
1477 /* No (second) fragments need to enter here, as nf_defrag_ipv6
1478 * replayed fragment zero will already have created the cp
1481 /* Schedule and create new connection entry into cpp */
1482 if (!pp->conn_schedule(ipvs, af, skb, pd, verdict, cpp, iph))
1486 if (unlikely(!*cpp)) {
1487 /* sorry, all this trouble for a no-hit :) */
1488 IP_VS_DBG_PKT(12, af, pp, skb, iph->off,
1489 "ip_vs_in: packet continues traversal as normal");
1491 /* Fragment couldn't be mapped to a conn entry */
1493 IP_VS_DBG_PKT(7, af, pp, skb, iph->off,
1494 "unhandled fragment");
1496 *verdict = NF_ACCEPT;
1503 /* Check the UDP tunnel and return its header length */
1504 static int ipvs_udp_decap(struct netns_ipvs *ipvs, struct sk_buff *skb,
1505 unsigned int offset, __u16 af,
1506 const union nf_inet_addr *daddr, __u8 *proto)
1508 struct udphdr _udph, *udph;
1509 struct ip_vs_dest *dest;
1511 udph = skb_header_pointer(skb, offset, sizeof(_udph), &_udph);
1514 offset += sizeof(struct udphdr);
1515 dest = ip_vs_find_tunnel(ipvs, af, daddr, udph->dest);
1518 if (dest->tun_type == IP_VS_CONN_F_TUNNEL_TYPE_GUE) {
1519 struct guehdr _gueh, *gueh;
1521 gueh = skb_header_pointer(skb, offset, sizeof(_gueh), &_gueh);
1524 if (gueh->control != 0 || gueh->version != 0)
1526 /* Later we can support also IPPROTO_IPV6 */
1527 if (gueh->proto_ctype != IPPROTO_IPIP)
1529 *proto = gueh->proto_ctype;
1530 return sizeof(struct udphdr) + sizeof(struct guehdr) +
1538 /* Check the GRE tunnel and return its header length */
1539 static int ipvs_gre_decap(struct netns_ipvs *ipvs, struct sk_buff *skb,
1540 unsigned int offset, __u16 af,
1541 const union nf_inet_addr *daddr, __u8 *proto)
1543 struct gre_base_hdr _greh, *greh;
1544 struct ip_vs_dest *dest;
1546 greh = skb_header_pointer(skb, offset, sizeof(_greh), &_greh);
1549 dest = ip_vs_find_tunnel(ipvs, af, daddr, 0);
1552 if (dest->tun_type == IP_VS_CONN_F_TUNNEL_TYPE_GRE) {
1555 /* Only support version 0 and C (csum) */
1556 if ((greh->flags & ~GRE_CSUM) != 0)
1558 type = greh->protocol;
1559 /* Later we can support also IPPROTO_IPV6 */
1560 if (type != htons(ETH_P_IP))
1562 *proto = IPPROTO_IPIP;
1563 return gre_calc_hlen(gre_flags_to_tnl_flags(greh->flags));
1571 * Handle ICMP messages in the outside-to-inside direction (incoming).
1572 * Find any that might be relevant, check against existing connections,
1573 * forward to the right destination host if relevant.
1574 * Currently handles error types - unreachable, quench, ttl exceeded.
1577 ip_vs_in_icmp(struct netns_ipvs *ipvs, struct sk_buff *skb, int *related,
1578 unsigned int hooknum)
1581 struct icmphdr _icmph, *ic;
1582 struct iphdr _ciph, *cih; /* The ip header contained within the ICMP */
1583 struct ip_vs_iphdr ciph;
1584 struct ip_vs_conn *cp;
1585 struct ip_vs_protocol *pp;
1586 struct ip_vs_proto_data *pd;
1587 unsigned int offset, offset2, ihl, verdict;
1588 bool tunnel, new_cp = false;
1589 union nf_inet_addr *raddr;
1590 char *outer_proto = "IPIP";
1594 /* reassemble IP fragments */
1595 if (ip_is_fragment(ip_hdr(skb))) {
1596 if (ip_vs_gather_frags(ipvs, skb, ip_vs_defrag_user(hooknum)))
1601 offset = ihl = iph->ihl * 4;
1602 ic = skb_header_pointer(skb, offset, sizeof(_icmph), &_icmph);
1606 IP_VS_DBG(12, "Incoming ICMP (%d,%d) %pI4->%pI4\n",
1607 ic->type, ntohs(icmp_id(ic)),
1608 &iph->saddr, &iph->daddr);
1611 * Work through seeing if this is for us.
1612 * These checks are supposed to be in an order that means easy
1613 * things are checked first to speed up processing.... however
1614 * this means that some packets will manage to get a long way
1615 * down this stack and then be rejected, but that's life.
1617 if ((ic->type != ICMP_DEST_UNREACH) &&
1618 (ic->type != ICMP_SOURCE_QUENCH) &&
1619 (ic->type != ICMP_TIME_EXCEEDED)) {
1624 /* Now find the contained IP header */
1625 offset += sizeof(_icmph);
1626 cih = skb_header_pointer(skb, offset, sizeof(_ciph), &_ciph);
1628 return NF_ACCEPT; /* The packet looks wrong, ignore */
1629 raddr = (union nf_inet_addr *)&cih->daddr;
1631 /* Special case for errors for IPIP/UDP/GRE tunnel packets */
1633 if (cih->protocol == IPPROTO_IPIP) {
1634 struct ip_vs_dest *dest;
1636 if (unlikely(cih->frag_off & htons(IP_OFFSET)))
1638 /* Error for our IPIP must arrive at LOCAL_IN */
1639 if (!(skb_rtable(skb)->rt_flags & RTCF_LOCAL))
1641 dest = ip_vs_find_tunnel(ipvs, AF_INET, raddr, 0);
1642 /* Only for known tunnel */
1643 if (!dest || dest->tun_type != IP_VS_CONN_F_TUNNEL_TYPE_IPIP)
1645 offset += cih->ihl * 4;
1646 cih = skb_header_pointer(skb, offset, sizeof(_ciph), &_ciph);
1648 return NF_ACCEPT; /* The packet looks wrong, ignore */
1650 } else if ((cih->protocol == IPPROTO_UDP || /* Can be UDP encap */
1651 cih->protocol == IPPROTO_GRE) && /* Can be GRE encap */
1652 /* Error for our tunnel must arrive at LOCAL_IN */
1653 (skb_rtable(skb)->rt_flags & RTCF_LOCAL)) {
1657 /* Non-first fragment has no UDP/GRE header */
1658 if (unlikely(cih->frag_off & htons(IP_OFFSET)))
1660 offset2 = offset + cih->ihl * 4;
1661 if (cih->protocol == IPPROTO_UDP) {
1662 ulen = ipvs_udp_decap(ipvs, skb, offset2, AF_INET,
1664 outer_proto = "UDP";
1666 ulen = ipvs_gre_decap(ipvs, skb, offset2, AF_INET,
1668 outer_proto = "GRE";
1671 /* Skip IP and UDP/GRE tunnel headers */
1672 offset = offset2 + ulen;
1673 /* Now we should be at the original IP header */
1674 cih = skb_header_pointer(skb, offset, sizeof(_ciph),
1676 if (cih && cih->version == 4 && cih->ihl >= 5 &&
1677 iproto == IPPROTO_IPIP)
1684 pd = ip_vs_proto_data_get(ipvs, cih->protocol);
1689 /* Is the embedded protocol header present? */
1690 if (unlikely(cih->frag_off & htons(IP_OFFSET) &&
1694 IP_VS_DBG_PKT(11, AF_INET, pp, skb, offset,
1695 "Checking incoming ICMP for");
1698 ip_vs_fill_iph_skb_icmp(AF_INET, skb, offset, !tunnel, &ciph);
1701 /* The embedded headers contain source and dest in reverse order.
1702 * For IPIP/UDP/GRE tunnel this is error for request, not for reply.
1704 cp = INDIRECT_CALL_1(pp->conn_in_get, ip_vs_conn_in_get_proto,
1705 ipvs, AF_INET, skb, &ciph);
1710 if (tunnel || !sysctl_schedule_icmp(ipvs))
1713 if (!ip_vs_try_to_schedule(ipvs, AF_INET, skb, pd, &v, &cp, &ciph))
1720 /* Ensure the checksum is correct */
1721 if (!skb_csum_unnecessary(skb) && ip_vs_checksum_complete(skb, ihl)) {
1722 /* Failed checksum! */
1723 IP_VS_DBG(1, "Incoming ICMP: failed checksum from %pI4!\n",
1729 __be32 info = ic->un.gateway;
1730 __u8 type = ic->type;
1731 __u8 code = ic->code;
1733 /* Update the MTU */
1734 if (ic->type == ICMP_DEST_UNREACH &&
1735 ic->code == ICMP_FRAG_NEEDED) {
1736 struct ip_vs_dest *dest = cp->dest;
1737 u32 mtu = ntohs(ic->un.frag.mtu);
1738 __be16 frag_off = cih->frag_off;
1740 /* Strip outer IP and ICMP, go to IPIP/UDP/GRE header */
1741 if (pskb_pull(skb, ihl + sizeof(_icmph)) == NULL)
1743 offset2 -= ihl + sizeof(_icmph);
1744 skb_reset_network_header(skb);
1745 IP_VS_DBG(12, "ICMP for %s %pI4->%pI4: mtu=%u\n",
1746 outer_proto, &ip_hdr(skb)->saddr,
1747 &ip_hdr(skb)->daddr, mtu);
1748 ipv4_update_pmtu(skb, ipvs->net, mtu, 0, 0);
1749 /* Client uses PMTUD? */
1750 if (!(frag_off & htons(IP_DF)))
1752 /* Prefer the resulting PMTU */
1754 struct ip_vs_dest_dst *dest_dst;
1756 dest_dst = rcu_dereference(dest->dest_dst);
1758 mtu = dst_mtu(dest_dst->dst_cache);
1760 if (mtu > 68 + sizeof(struct iphdr))
1761 mtu -= sizeof(struct iphdr);
1764 /* Strip outer IP, ICMP and IPIP/UDP/GRE, go to IP header of
1767 if (pskb_pull(skb, offset2) == NULL)
1769 skb_reset_network_header(skb);
1770 IP_VS_DBG(12, "Sending ICMP for %pI4->%pI4: t=%u, c=%u, i=%u\n",
1771 &ip_hdr(skb)->saddr, &ip_hdr(skb)->daddr,
1772 type, code, ntohl(info));
1773 icmp_send(skb, type, code, info);
1774 /* ICMP can be shorter but anyways, account it */
1775 ip_vs_out_stats(cp, skb);
1779 verdict = NF_STOLEN;
1783 /* do the statistics and put it back */
1784 ip_vs_in_stats(cp, skb);
1785 if (IPPROTO_TCP == cih->protocol || IPPROTO_UDP == cih->protocol ||
1786 IPPROTO_SCTP == cih->protocol)
1787 offset += 2 * sizeof(__u16);
1788 verdict = ip_vs_icmp_xmit(skb, cp, pp, offset, hooknum, &ciph);
1791 if (likely(!new_cp))
1792 __ip_vs_conn_put(cp);
1799 #ifdef CONFIG_IP_VS_IPV6
1800 static int ip_vs_in_icmp_v6(struct netns_ipvs *ipvs, struct sk_buff *skb,
1801 int *related, unsigned int hooknum,
1802 struct ip_vs_iphdr *iph)
1804 struct icmp6hdr _icmph, *ic;
1805 struct ip_vs_iphdr ciph = {.flags = 0, .fragoffs = 0};/*Contained IP */
1806 struct ip_vs_conn *cp;
1807 struct ip_vs_protocol *pp;
1808 struct ip_vs_proto_data *pd;
1809 unsigned int offset, verdict;
1810 bool new_cp = false;
1814 ic = frag_safe_skb_hp(skb, iph->len, sizeof(_icmph), &_icmph);
1819 * Work through seeing if this is for us.
1820 * These checks are supposed to be in an order that means easy
1821 * things are checked first to speed up processing.... however
1822 * this means that some packets will manage to get a long way
1823 * down this stack and then be rejected, but that's life.
1825 if (ic->icmp6_type & ICMPV6_INFOMSG_MASK) {
1829 /* Fragment header that is before ICMP header tells us that:
1830 * it's not an error message since they can't be fragmented.
1832 if (iph->flags & IP6_FH_F_FRAG)
1835 IP_VS_DBG(8, "Incoming ICMPv6 (%d,%d) %pI6c->%pI6c\n",
1836 ic->icmp6_type, ntohs(icmpv6_id(ic)),
1837 &iph->saddr, &iph->daddr);
1839 offset = iph->len + sizeof(_icmph);
1840 if (!ip_vs_fill_iph_skb_icmp(AF_INET6, skb, offset, true, &ciph))
1843 pd = ip_vs_proto_data_get(ipvs, ciph.protocol);
1848 /* Cannot handle fragmented embedded protocol */
1852 IP_VS_DBG_PKT(11, AF_INET6, pp, skb, offset,
1853 "Checking incoming ICMPv6 for");
1855 /* The embedded headers contain source and dest in reverse order
1856 * if not from localhost
1858 cp = INDIRECT_CALL_1(pp->conn_in_get, ip_vs_conn_in_get_proto,
1859 ipvs, AF_INET6, skb, &ciph);
1864 if (!sysctl_schedule_icmp(ipvs))
1867 if (!ip_vs_try_to_schedule(ipvs, AF_INET6, skb, pd, &v, &cp, &ciph))
1873 /* VS/TUN, VS/DR and LOCALNODE just let it go */
1874 if ((hooknum == NF_INET_LOCAL_OUT) &&
1875 (IP_VS_FWD_METHOD(cp) != IP_VS_CONN_F_MASQ)) {
1876 verdict = NF_ACCEPT;
1880 /* do the statistics and put it back */
1881 ip_vs_in_stats(cp, skb);
1883 /* Need to mangle contained IPv6 header in ICMPv6 packet */
1885 if (IPPROTO_TCP == ciph.protocol || IPPROTO_UDP == ciph.protocol ||
1886 IPPROTO_SCTP == ciph.protocol)
1887 offset += 2 * sizeof(__u16); /* Also mangle ports */
1889 verdict = ip_vs_icmp_xmit_v6(skb, cp, pp, offset, hooknum, &ciph);
1892 if (likely(!new_cp))
1893 __ip_vs_conn_put(cp);
1903 * Check if it's for virtual services, look it up,
1904 * and send it on its way...
1907 ip_vs_in_hook(void *priv, struct sk_buff *skb, const struct nf_hook_state *state)
1909 struct netns_ipvs *ipvs = net_ipvs(state->net);
1910 unsigned int hooknum = state->hook;
1911 struct ip_vs_iphdr iph;
1912 struct ip_vs_protocol *pp;
1913 struct ip_vs_proto_data *pd;
1914 struct ip_vs_conn *cp;
1919 /* Already marked as IPVS request or reply? */
1920 if (skb->ipvs_property)
1925 * - remote client: only PACKET_HOST
1926 * - route: used for struct net when skb->dev is unset
1928 if (unlikely((skb->pkt_type != PACKET_HOST &&
1929 hooknum != NF_INET_LOCAL_OUT) ||
1931 ip_vs_fill_iph_skb(af, skb, false, &iph);
1932 IP_VS_DBG_BUF(12, "packet type=%d proto=%d daddr=%s"
1933 " ignored in hook %u\n",
1934 skb->pkt_type, iph.protocol,
1935 IP_VS_DBG_ADDR(af, &iph.daddr), hooknum);
1938 /* ipvs enabled in this netns ? */
1939 if (unlikely(sysctl_backup_only(ipvs) || !ipvs->enable))
1942 ip_vs_fill_iph_skb(af, skb, false, &iph);
1944 /* Bad... Do not break raw sockets */
1945 sk = skb_to_full_sk(skb);
1946 if (unlikely(sk && hooknum == NF_INET_LOCAL_OUT &&
1949 if (sk->sk_family == PF_INET && inet_test_bit(NODEFRAG, sk))
1953 #ifdef CONFIG_IP_VS_IPV6
1954 if (af == AF_INET6) {
1955 if (unlikely(iph.protocol == IPPROTO_ICMPV6)) {
1957 int verdict = ip_vs_in_icmp_v6(ipvs, skb, &related,
1965 if (unlikely(iph.protocol == IPPROTO_ICMP)) {
1967 int verdict = ip_vs_in_icmp(ipvs, skb, &related,
1974 /* Protocol supported? */
1975 pd = ip_vs_proto_data_get(ipvs, iph.protocol);
1976 if (unlikely(!pd)) {
1977 /* The only way we'll see this packet again is if it's
1978 * encapsulated, so mark it with ipvs_property=1 so we
1979 * skip it if we're ignoring tunneled packets
1981 if (sysctl_ignore_tunneled(ipvs))
1982 skb->ipvs_property = 1;
1988 * Check if the packet belongs to an existing connection entry
1990 cp = INDIRECT_CALL_1(pp->conn_in_get, ip_vs_conn_in_get_proto,
1991 ipvs, af, skb, &iph);
1993 if (!iph.fragoffs && is_new_conn(skb, &iph) && cp) {
1994 int conn_reuse_mode = sysctl_conn_reuse_mode(ipvs);
1995 bool old_ct = false, resched = false;
1997 if (unlikely(sysctl_expire_nodest_conn(ipvs)) && cp->dest &&
1998 unlikely(!atomic_read(&cp->dest->weight))) {
2000 old_ct = ip_vs_conn_uses_old_conntrack(cp, skb);
2001 } else if (conn_reuse_mode &&
2002 is_new_conn_expected(cp, conn_reuse_mode)) {
2003 old_ct = ip_vs_conn_uses_old_conntrack(cp, skb);
2004 if (!atomic_read(&cp->n_control)) {
2007 /* Do not reschedule controlling connection
2008 * that uses conntrack while it is still
2009 * referenced by controlled connection(s).
2017 cp->flags &= ~IP_VS_CONN_F_NFCT;
2018 if (!atomic_read(&cp->n_control))
2019 ip_vs_conn_expire_now(cp);
2020 __ip_vs_conn_put(cp);
2027 /* Check the server status */
2028 if (cp && cp->dest && !(cp->dest->flags & IP_VS_DEST_F_AVAILABLE)) {
2029 /* the destination server is not available */
2030 if (sysctl_expire_nodest_conn(ipvs)) {
2031 bool old_ct = ip_vs_conn_uses_old_conntrack(cp, skb);
2034 cp->flags &= ~IP_VS_CONN_F_NFCT;
2036 ip_vs_conn_expire_now(cp);
2037 __ip_vs_conn_put(cp);
2042 __ip_vs_conn_put(cp);
2047 if (unlikely(!cp)) {
2050 if (!ip_vs_try_to_schedule(ipvs, af, skb, pd, &v, &cp, &iph))
2054 IP_VS_DBG_PKT(11, af, pp, skb, iph.off, "Incoming packet");
2056 ip_vs_in_stats(cp, skb);
2057 ip_vs_set_state(cp, IP_VS_DIR_INPUT, skb, pd);
2058 if (cp->packet_xmit)
2059 ret = cp->packet_xmit(skb, cp, pp, &iph);
2060 /* do not touch skb anymore */
2062 IP_VS_DBG_RL("warning: packet_xmit is null");
2066 /* Increase its packet counter and check if it is needed
2067 * to be synchronized
2069 * Sync connection if it is about to close to
2070 * encorage the standby servers to update the connections timeout
2072 * For ONE_PKT let ip_vs_sync_conn() do the filter work.
2075 if (cp->flags & IP_VS_CONN_F_ONE_PACKET)
2076 pkts = sysctl_sync_threshold(ipvs);
2078 pkts = atomic_inc_return(&cp->in_pkts);
2080 if (ipvs->sync_state & IP_VS_STATE_MASTER)
2081 ip_vs_sync_conn(ipvs, cp, pkts);
2082 else if ((cp->flags & IP_VS_CONN_F_ONE_PACKET) && cp->control)
2083 /* increment is done inside ip_vs_sync_conn too */
2084 atomic_inc(&cp->control->in_pkts);
2091 * It is hooked at the NF_INET_FORWARD chain, in order to catch ICMP
2092 * related packets destined for 0.0.0.0/0.
2093 * When fwmark-based virtual service is used, such as transparent
2094 * cache cluster, TCP packets can be marked and routed to ip_vs_in,
2095 * but ICMP destined for 0.0.0.0/0 cannot not be easily marked and
2096 * sent to ip_vs_in_icmp. So, catch them at the NF_INET_FORWARD chain
2097 * and send them to ip_vs_in_icmp.
2100 ip_vs_forward_icmp(void *priv, struct sk_buff *skb,
2101 const struct nf_hook_state *state)
2103 struct netns_ipvs *ipvs = net_ipvs(state->net);
2106 /* ipvs enabled in this netns ? */
2107 if (unlikely(sysctl_backup_only(ipvs) || !ipvs->enable))
2110 if (state->pf == NFPROTO_IPV4) {
2111 if (ip_hdr(skb)->protocol != IPPROTO_ICMP)
2113 #ifdef CONFIG_IP_VS_IPV6
2115 struct ip_vs_iphdr iphdr;
2117 ip_vs_fill_iph_skb(AF_INET6, skb, false, &iphdr);
2119 if (iphdr.protocol != IPPROTO_ICMPV6)
2122 return ip_vs_in_icmp_v6(ipvs, skb, &r, state->hook, &iphdr);
2126 return ip_vs_in_icmp(ipvs, skb, &r, state->hook);
2129 static const struct nf_hook_ops ip_vs_ops4[] = {
2130 /* After packet filtering, change source only for VS/NAT */
2132 .hook = ip_vs_out_hook,
2134 .hooknum = NF_INET_LOCAL_IN,
2135 .priority = NF_IP_PRI_NAT_SRC - 2,
2137 /* After packet filtering, forward packet through VS/DR, VS/TUN,
2138 * or VS/NAT(change destination), so that filtering rules can be
2139 * applied to IPVS. */
2141 .hook = ip_vs_in_hook,
2143 .hooknum = NF_INET_LOCAL_IN,
2144 .priority = NF_IP_PRI_NAT_SRC - 1,
2146 /* Before ip_vs_in, change source only for VS/NAT */
2148 .hook = ip_vs_out_hook,
2150 .hooknum = NF_INET_LOCAL_OUT,
2151 .priority = NF_IP_PRI_NAT_DST + 1,
2153 /* After mangle, schedule and forward local requests */
2155 .hook = ip_vs_in_hook,
2157 .hooknum = NF_INET_LOCAL_OUT,
2158 .priority = NF_IP_PRI_NAT_DST + 2,
2160 /* After packet filtering (but before ip_vs_out_icmp), catch icmp
2161 * destined for 0.0.0.0/0, which is for incoming IPVS connections */
2163 .hook = ip_vs_forward_icmp,
2165 .hooknum = NF_INET_FORWARD,
2168 /* After packet filtering, change source only for VS/NAT */
2170 .hook = ip_vs_out_hook,
2172 .hooknum = NF_INET_FORWARD,
2177 #ifdef CONFIG_IP_VS_IPV6
2178 static const struct nf_hook_ops ip_vs_ops6[] = {
2179 /* After packet filtering, change source only for VS/NAT */
2181 .hook = ip_vs_out_hook,
2183 .hooknum = NF_INET_LOCAL_IN,
2184 .priority = NF_IP6_PRI_NAT_SRC - 2,
2186 /* After packet filtering, forward packet through VS/DR, VS/TUN,
2187 * or VS/NAT(change destination), so that filtering rules can be
2188 * applied to IPVS. */
2190 .hook = ip_vs_in_hook,
2192 .hooknum = NF_INET_LOCAL_IN,
2193 .priority = NF_IP6_PRI_NAT_SRC - 1,
2195 /* Before ip_vs_in, change source only for VS/NAT */
2197 .hook = ip_vs_out_hook,
2199 .hooknum = NF_INET_LOCAL_OUT,
2200 .priority = NF_IP6_PRI_NAT_DST + 1,
2202 /* After mangle, schedule and forward local requests */
2204 .hook = ip_vs_in_hook,
2206 .hooknum = NF_INET_LOCAL_OUT,
2207 .priority = NF_IP6_PRI_NAT_DST + 2,
2209 /* After packet filtering (but before ip_vs_out_icmp), catch icmp
2210 * destined for 0.0.0.0/0, which is for incoming IPVS connections */
2212 .hook = ip_vs_forward_icmp,
2214 .hooknum = NF_INET_FORWARD,
2217 /* After packet filtering, change source only for VS/NAT */
2219 .hook = ip_vs_out_hook,
2221 .hooknum = NF_INET_FORWARD,
2227 int ip_vs_register_hooks(struct netns_ipvs *ipvs, unsigned int af)
2229 const struct nf_hook_ops *ops;
2231 unsigned int afmask;
2234 if (af == AF_INET6) {
2235 #ifdef CONFIG_IP_VS_IPV6
2237 count = ARRAY_SIZE(ip_vs_ops6);
2244 count = ARRAY_SIZE(ip_vs_ops4);
2248 if (!(ipvs->hooks_afmask & afmask)) {
2249 ret = nf_register_net_hooks(ipvs->net, ops, count);
2251 ipvs->hooks_afmask |= afmask;
2256 void ip_vs_unregister_hooks(struct netns_ipvs *ipvs, unsigned int af)
2258 const struct nf_hook_ops *ops;
2260 unsigned int afmask;
2262 if (af == AF_INET6) {
2263 #ifdef CONFIG_IP_VS_IPV6
2265 count = ARRAY_SIZE(ip_vs_ops6);
2272 count = ARRAY_SIZE(ip_vs_ops4);
2276 if (ipvs->hooks_afmask & afmask) {
2277 nf_unregister_net_hooks(ipvs->net, ops, count);
2278 ipvs->hooks_afmask &= ~afmask;
2283 * Initialize IP Virtual Server netns mem.
2285 static int __net_init __ip_vs_init(struct net *net)
2287 struct netns_ipvs *ipvs;
2289 ipvs = net_generic(net, ip_vs_net_id);
2293 /* Hold the beast until a service is registered */
2296 /* Counters used for creating unique names */
2297 ipvs->gen = atomic_read(&ipvs_netns_cnt);
2298 atomic_inc(&ipvs_netns_cnt);
2301 if (ip_vs_estimator_net_init(ipvs) < 0)
2302 goto estimator_fail;
2304 if (ip_vs_control_net_init(ipvs) < 0)
2307 if (ip_vs_protocol_net_init(ipvs) < 0)
2310 if (ip_vs_app_net_init(ipvs) < 0)
2313 if (ip_vs_conn_net_init(ipvs) < 0)
2316 if (ip_vs_sync_net_init(ipvs) < 0)
2325 ip_vs_conn_net_cleanup(ipvs);
2327 ip_vs_app_net_cleanup(ipvs);
2329 ip_vs_protocol_net_cleanup(ipvs);
2331 ip_vs_control_net_cleanup(ipvs);
2333 ip_vs_estimator_net_cleanup(ipvs);
2339 static void __net_exit __ip_vs_cleanup_batch(struct list_head *net_list)
2341 struct netns_ipvs *ipvs;
2344 ip_vs_service_nets_cleanup(net_list); /* ip_vs_flush() with locks */
2345 list_for_each_entry(net, net_list, exit_list) {
2346 ipvs = net_ipvs(net);
2347 ip_vs_conn_net_cleanup(ipvs);
2348 ip_vs_app_net_cleanup(ipvs);
2349 ip_vs_protocol_net_cleanup(ipvs);
2350 ip_vs_control_net_cleanup(ipvs);
2351 ip_vs_estimator_net_cleanup(ipvs);
2352 IP_VS_DBG(2, "ipvs netns %d released\n", ipvs->gen);
2357 static void __net_exit __ip_vs_dev_cleanup_batch(struct list_head *net_list)
2359 struct netns_ipvs *ipvs;
2362 list_for_each_entry(net, net_list, exit_list) {
2363 ipvs = net_ipvs(net);
2364 ip_vs_unregister_hooks(ipvs, AF_INET);
2365 ip_vs_unregister_hooks(ipvs, AF_INET6);
2366 ipvs->enable = 0; /* Disable packet reception */
2368 ip_vs_sync_net_cleanup(ipvs);
2372 static struct pernet_operations ipvs_core_ops = {
2373 .init = __ip_vs_init,
2374 .exit_batch = __ip_vs_cleanup_batch,
2375 .id = &ip_vs_net_id,
2376 .size = sizeof(struct netns_ipvs),
2379 static struct pernet_operations ipvs_core_dev_ops = {
2380 .exit_batch = __ip_vs_dev_cleanup_batch,
2384 * Initialize IP Virtual Server
2386 static int __init ip_vs_init(void)
2390 ret = ip_vs_control_init();
2392 pr_err("can't setup control.\n");
2396 ip_vs_protocol_init();
2398 ret = ip_vs_conn_init();
2400 pr_err("can't setup connection table.\n");
2401 goto cleanup_protocol;
2404 ret = register_pernet_subsys(&ipvs_core_ops); /* Alloc ip_vs struct */
2408 ret = register_pernet_device(&ipvs_core_dev_ops);
2412 ret = ip_vs_register_nl_ioctl();
2414 pr_err("can't register netlink/ioctl.\n");
2418 pr_info("ipvs loaded.\n");
2423 unregister_pernet_device(&ipvs_core_dev_ops);
2425 unregister_pernet_subsys(&ipvs_core_ops);
2427 ip_vs_conn_cleanup();
2429 ip_vs_protocol_cleanup();
2430 ip_vs_control_cleanup();
2435 static void __exit ip_vs_cleanup(void)
2437 ip_vs_unregister_nl_ioctl();
2438 unregister_pernet_device(&ipvs_core_dev_ops);
2439 unregister_pernet_subsys(&ipvs_core_ops); /* free ip_vs struct */
2440 ip_vs_conn_cleanup();
2441 ip_vs_protocol_cleanup();
2442 ip_vs_control_cleanup();
2443 /* common rcu_barrier() used by:
2444 * - ip_vs_control_cleanup()
2447 pr_info("ipvs unloaded.\n");
2450 module_init(ip_vs_init);
2451 module_exit(ip_vs_cleanup);
2452 MODULE_LICENSE("GPL");
2453 MODULE_DESCRIPTION("IP Virtual Server");