--- /dev/null
+/*
+ * IPVS An implementation of the IP virtual server support for the
+ * LINUX operating system. IPVS is now implemented as a module
+ * over the Netfilter framework. IPVS can be used to build a
+ * high-performance and highly available server based on a
+ * cluster of servers.
+ *
+ * Authors: Wensong Zhang <wensong@linuxvirtualserver.org>
+ * Peter Kese <peter.kese@ijs.si>
+ * Julian Anastasov <ja@ssi.bg>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ * The IPVS code for kernel 2.2 was done by Wensong Zhang and Peter Kese,
+ * with changes/fixes from Julian Anastasov, Lars Marowsky-Bree, Horms
+ * and others.
+ *
+ * Changes:
+ * Paul `Rusty' Russell properly handle non-linear skbs
+ * Harald Welte don't use nfcache
+ *
+ */
+
+#define KMSG_COMPONENT "IPVS"
+#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/ip.h>
+#include <linux/tcp.h>
+#include <linux/sctp.h>
+#include <linux/icmp.h>
+#include <linux/slab.h>
+
+#include <net/ip.h>
+#include <net/tcp.h>
+#include <net/udp.h>
+#include <net/icmp.h> /* for icmp_send */
+#include <net/route.h>
+#include <net/ip6_checksum.h>
+#include <net/netns/generic.h> /* net_generic() */
+
+#include <linux/netfilter.h>
+#include <linux/netfilter_ipv4.h>
+
+#ifdef CONFIG_IP_VS_IPV6
+#include <net/ipv6.h>
+#include <linux/netfilter_ipv6.h>
+#include <net/ip6_route.h>
+#endif
+
+#include <net/ip_vs.h>
+
+
+EXPORT_SYMBOL(register_ip_vs_scheduler);
+EXPORT_SYMBOL(unregister_ip_vs_scheduler);
+EXPORT_SYMBOL(ip_vs_proto_name);
+EXPORT_SYMBOL(ip_vs_conn_new);
+EXPORT_SYMBOL(ip_vs_conn_in_get);
+EXPORT_SYMBOL(ip_vs_conn_out_get);
+#ifdef CONFIG_IP_VS_PROTO_TCP
+EXPORT_SYMBOL(ip_vs_tcp_conn_listen);
+#endif
+EXPORT_SYMBOL(ip_vs_conn_put);
+#ifdef CONFIG_IP_VS_DEBUG
+EXPORT_SYMBOL(ip_vs_get_debug_level);
+#endif
+
+static int ip_vs_net_id __read_mostly;
+/* netns cnt used for uniqueness */
+static atomic_t ipvs_netns_cnt = ATOMIC_INIT(0);
+
+/* ID used in ICMP lookups */
+#define icmp_id(icmph) (((icmph)->un).echo.id)
+#define icmpv6_id(icmph) (icmph->icmp6_dataun.u_echo.identifier)
+
+const char *ip_vs_proto_name(unsigned int proto)
+{
+ static char buf[20];
+
+ switch (proto) {
+ case IPPROTO_IP:
+ return "IP";
+ case IPPROTO_UDP:
+ return "UDP";
+ case IPPROTO_TCP:
+ return "TCP";
+ case IPPROTO_SCTP:
+ return "SCTP";
+ case IPPROTO_ICMP:
+ return "ICMP";
+#ifdef CONFIG_IP_VS_IPV6
+ case IPPROTO_ICMPV6:
+ return "ICMPv6";
+#endif
+ default:
+ sprintf(buf, "IP_%u", proto);
+ return buf;
+ }
+}
+
+void ip_vs_init_hash_table(struct list_head *table, int rows)
+{
+ while (--rows >= 0)
+ INIT_LIST_HEAD(&table[rows]);
+}
+
+static inline void
+ip_vs_in_stats(struct ip_vs_conn *cp, struct sk_buff *skb)
+{
+ struct ip_vs_dest *dest = cp->dest;
+ struct netns_ipvs *ipvs = net_ipvs(skb_net(skb));
+
+ if (dest && (dest->flags & IP_VS_DEST_F_AVAILABLE)) {
+ struct ip_vs_cpu_stats *s;
+ struct ip_vs_service *svc;
+
+ s = this_cpu_ptr(dest->stats.cpustats);
+ u64_stats_update_begin(&s->syncp);
+ s->cnt.inpkts++;
+ s->cnt.inbytes += skb->len;
+ u64_stats_update_end(&s->syncp);
+
+ rcu_read_lock();
+ svc = rcu_dereference(dest->svc);
+ s = this_cpu_ptr(svc->stats.cpustats);
+ u64_stats_update_begin(&s->syncp);
+ s->cnt.inpkts++;
+ s->cnt.inbytes += skb->len;
+ u64_stats_update_end(&s->syncp);
+ rcu_read_unlock();
+
+ s = this_cpu_ptr(ipvs->tot_stats.cpustats);
+ u64_stats_update_begin(&s->syncp);
+ s->cnt.inpkts++;
+ s->cnt.inbytes += skb->len;
+ u64_stats_update_end(&s->syncp);
+ }
+}
+
+
+static inline void
+ip_vs_out_stats(struct ip_vs_conn *cp, struct sk_buff *skb)
+{
+ struct ip_vs_dest *dest = cp->dest;
+ struct netns_ipvs *ipvs = net_ipvs(skb_net(skb));
+
+ if (dest && (dest->flags & IP_VS_DEST_F_AVAILABLE)) {
+ struct ip_vs_cpu_stats *s;
+ struct ip_vs_service *svc;
+
+ s = this_cpu_ptr(dest->stats.cpustats);
+ u64_stats_update_begin(&s->syncp);
+ s->cnt.outpkts++;
+ s->cnt.outbytes += skb->len;
+ u64_stats_update_end(&s->syncp);
+
+ rcu_read_lock();
+ svc = rcu_dereference(dest->svc);
+ s = this_cpu_ptr(svc->stats.cpustats);
+ u64_stats_update_begin(&s->syncp);
+ s->cnt.outpkts++;
+ s->cnt.outbytes += skb->len;
+ u64_stats_update_end(&s->syncp);
+ rcu_read_unlock();
+
+ s = this_cpu_ptr(ipvs->tot_stats.cpustats);
+ u64_stats_update_begin(&s->syncp);
+ s->cnt.outpkts++;
+ s->cnt.outbytes += skb->len;
+ u64_stats_update_end(&s->syncp);
+ }
+}
+
+
+static inline void
+ip_vs_conn_stats(struct ip_vs_conn *cp, struct ip_vs_service *svc)
+{
+ struct netns_ipvs *ipvs = net_ipvs(svc->net);
+ struct ip_vs_cpu_stats *s;
+
+ s = this_cpu_ptr(cp->dest->stats.cpustats);
+ u64_stats_update_begin(&s->syncp);
+ s->cnt.conns++;
+ u64_stats_update_end(&s->syncp);
+
+ s = this_cpu_ptr(svc->stats.cpustats);
+ u64_stats_update_begin(&s->syncp);
+ s->cnt.conns++;
+ u64_stats_update_end(&s->syncp);
+
+ s = this_cpu_ptr(ipvs->tot_stats.cpustats);
+ u64_stats_update_begin(&s->syncp);
+ s->cnt.conns++;
+ u64_stats_update_end(&s->syncp);
+}
+
+
+static inline void
+ip_vs_set_state(struct ip_vs_conn *cp, int direction,
+ const struct sk_buff *skb,
+ struct ip_vs_proto_data *pd)
+{
+ if (likely(pd->pp->state_transition))
+ pd->pp->state_transition(cp, direction, skb, pd);
+}
+
+static inline int
+ip_vs_conn_fill_param_persist(const struct ip_vs_service *svc,
+ struct sk_buff *skb, int protocol,
+ const union nf_inet_addr *caddr, __be16 cport,
+ const union nf_inet_addr *vaddr, __be16 vport,
+ struct ip_vs_conn_param *p)
+{
+ ip_vs_conn_fill_param(svc->net, svc->af, protocol, caddr, cport, vaddr,
+ vport, p);
+ p->pe = rcu_dereference(svc->pe);
+ if (p->pe && p->pe->fill_param)
+ return p->pe->fill_param(p, skb);
+
+ return 0;
+}
+
+/*
+ * IPVS persistent scheduling function
+ * It creates a connection entry according to its template if exists,
+ * or selects a server and creates a connection entry plus a template.
+ * Locking: we are svc user (svc->refcnt), so we hold all dests too
+ * Protocols supported: TCP, UDP
+ */
+static struct ip_vs_conn *
+ip_vs_sched_persist(struct ip_vs_service *svc,
+ struct sk_buff *skb, __be16 src_port, __be16 dst_port,
+ int *ignored, struct ip_vs_iphdr *iph)
+{
+ struct ip_vs_conn *cp = NULL;
+ struct ip_vs_dest *dest;
+ struct ip_vs_conn *ct;
+ __be16 dport = 0; /* destination port to forward */
+ unsigned int flags;
+ struct ip_vs_conn_param param;
+ const union nf_inet_addr fwmark = { .ip = htonl(svc->fwmark) };
+ union nf_inet_addr snet; /* source network of the client,
+ after masking */
+
+ /* Mask saddr with the netmask to adjust template granularity */
+#ifdef CONFIG_IP_VS_IPV6
+ if (svc->af == AF_INET6)
+ ipv6_addr_prefix(&snet.in6, &iph->saddr.in6,
+ (__force __u32) svc->netmask);
+ else
+#endif
+ snet.ip = iph->saddr.ip & svc->netmask;
+
+ IP_VS_DBG_BUF(6, "p-schedule: src %s:%u dest %s:%u "
+ "mnet %s\n",
+ IP_VS_DBG_ADDR(svc->af, &iph->saddr), ntohs(src_port),
+ IP_VS_DBG_ADDR(svc->af, &iph->daddr), ntohs(dst_port),
+ IP_VS_DBG_ADDR(svc->af, &snet));
+
+ /*
+ * As far as we know, FTP is a very complicated network protocol, and
+ * it uses control connection and data connections. For active FTP,
+ * FTP server initialize data connection to the client, its source port
+ * is often 20. For passive FTP, FTP server tells the clients the port
+ * that it passively listens to, and the client issues the data
+ * connection. In the tunneling or direct routing mode, the load
+ * balancer is on the client-to-server half of connection, the port
+ * number is unknown to the load balancer. So, a conn template like
+ * <caddr, 0, vaddr, 0, daddr, 0> is created for persistent FTP
+ * service, and a template like <caddr, 0, vaddr, vport, daddr, dport>
+ * is created for other persistent services.
+ */
+ {
+ int protocol = iph->protocol;
+ const union nf_inet_addr *vaddr = &iph->daddr;
+ __be16 vport = 0;
+
+ if (dst_port == svc->port) {
+ /* non-FTP template:
+ * <protocol, caddr, 0, vaddr, vport, daddr, dport>
+ * FTP template:
+ * <protocol, caddr, 0, vaddr, 0, daddr, 0>
+ */
+ if (svc->port != FTPPORT)
+ vport = dst_port;
+ } else {
+ /* Note: persistent fwmark-based services and
+ * persistent port zero service are handled here.
+ * fwmark template:
+ * <IPPROTO_IP,caddr,0,fwmark,0,daddr,0>
+ * port zero template:
+ * <protocol,caddr,0,vaddr,0,daddr,0>
+ */
+ if (svc->fwmark) {
+ protocol = IPPROTO_IP;
+ vaddr = &fwmark;
+ }
+ }
+ /* return *ignored = -1 so NF_DROP can be used */
+ if (ip_vs_conn_fill_param_persist(svc, skb, protocol, &snet, 0,
+ vaddr, vport, ¶m) < 0) {
+ *ignored = -1;
+ return NULL;
+ }
+ }
+
+ /* Check if a template already exists */
+ ct = ip_vs_ct_in_get(¶m);
+ if (!ct || !ip_vs_check_template(ct)) {
+ struct ip_vs_scheduler *sched;
+
+ /*
+ * No template found or the dest of the connection
+ * template is not available.
+ * return *ignored=0 i.e. ICMP and NF_DROP
+ */
+ sched = rcu_dereference(svc->scheduler);
+ dest = sched->schedule(svc, skb, iph);
+ if (!dest) {
+ IP_VS_DBG(1, "p-schedule: no dest found.\n");
+ kfree(param.pe_data);
+ *ignored = 0;
+ return NULL;
+ }
+
+ if (dst_port == svc->port && svc->port != FTPPORT)
+ dport = dest->port;
+
+ /* Create a template
+ * This adds param.pe_data to the template,
+ * and thus param.pe_data will be destroyed
+ * when the template expires */
+ ct = ip_vs_conn_new(¶m, dest->af, &dest->addr, dport,
+ IP_VS_CONN_F_TEMPLATE, dest, skb->mark);
+ if (ct == NULL) {
+ kfree(param.pe_data);
+ *ignored = -1;
+ return NULL;
+ }
+
+ ct->timeout = svc->timeout;
+ } else {
+ /* set destination with the found template */
+ dest = ct->dest;
+ kfree(param.pe_data);
+ }
+
+ dport = dst_port;
+ if (dport == svc->port && dest->port)
+ dport = dest->port;
+
+ flags = (svc->flags & IP_VS_SVC_F_ONEPACKET
+ && iph->protocol == IPPROTO_UDP) ?
+ IP_VS_CONN_F_ONE_PACKET : 0;
+
+ /*
+ * Create a new connection according to the template
+ */
+ ip_vs_conn_fill_param(svc->net, svc->af, iph->protocol, &iph->saddr,
+ src_port, &iph->daddr, dst_port, ¶m);
+
+ cp = ip_vs_conn_new(¶m, dest->af, &dest->addr, dport, flags, dest,
+ skb->mark);
+ if (cp == NULL) {
+ ip_vs_conn_put(ct);
+ *ignored = -1;
+ return NULL;
+ }
+
+ /*
+ * Add its control
+ */
+ ip_vs_control_add(cp, ct);
+ ip_vs_conn_put(ct);
+
+ ip_vs_conn_stats(cp, svc);
+ return cp;
+}
+
+
+/*
+ * IPVS main scheduling function
+ * It selects a server according to the virtual service, and
+ * creates a connection entry.
+ * Protocols supported: TCP, UDP
+ *
+ * Usage of *ignored
+ *
+ * 1 : protocol tried to schedule (eg. on SYN), found svc but the
+ * svc/scheduler decides that this packet should be accepted with
+ * NF_ACCEPT because it must not be scheduled.
+ *
+ * 0 : scheduler can not find destination, so try bypass or
+ * return ICMP and then NF_DROP (ip_vs_leave).
+ *
+ * -1 : scheduler tried to schedule but fatal error occurred, eg.
+ * ip_vs_conn_new failure (ENOMEM) or ip_vs_sip_fill_param
+ * failure such as missing Call-ID, ENOMEM on skb_linearize
+ * or pe_data. In this case we should return NF_DROP without
+ * any attempts to send ICMP with ip_vs_leave.
+ */
+struct ip_vs_conn *
+ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb,
+ struct ip_vs_proto_data *pd, int *ignored,
+ struct ip_vs_iphdr *iph)
+{
+ struct ip_vs_protocol *pp = pd->pp;
+ struct ip_vs_conn *cp = NULL;
+ struct ip_vs_scheduler *sched;
+ struct ip_vs_dest *dest;
+ __be16 _ports[2], *pptr;
+ unsigned int flags;
+
+ *ignored = 1;
+ /*
+ * IPv6 frags, only the first hit here.
+ */
+ pptr = frag_safe_skb_hp(skb, iph->len, sizeof(_ports), _ports, iph);
+ if (pptr == NULL)
+ return NULL;
+
+ /*
+ * FTPDATA needs this check when using local real server.
+ * Never schedule Active FTPDATA connections from real server.
+ * For LVS-NAT they must be already created. For other methods
+ * with persistence the connection is created on SYN+ACK.
+ */
+ if (pptr[0] == FTPDATA) {
+ IP_VS_DBG_PKT(12, svc->af, pp, skb, 0,
+ "Not scheduling FTPDATA");
+ return NULL;
+ }
+
+ /*
+ * Do not schedule replies from local real server.
+ */
+ if ((!skb->dev || skb->dev->flags & IFF_LOOPBACK) &&
+ (cp = pp->conn_in_get(svc->af, skb, iph, 1))) {
+ IP_VS_DBG_PKT(12, svc->af, pp, skb, 0,
+ "Not scheduling reply for existing connection");
+ __ip_vs_conn_put(cp);
+ return NULL;
+ }
+
+ /*
+ * Persistent service
+ */
+ if (svc->flags & IP_VS_SVC_F_PERSISTENT)
+ return ip_vs_sched_persist(svc, skb, pptr[0], pptr[1], ignored,
+ iph);
+
+ *ignored = 0;
+
+ /*
+ * Non-persistent service
+ */
+ if (!svc->fwmark && pptr[1] != svc->port) {
+ if (!svc->port)
+ pr_err("Schedule: port zero only supported "
+ "in persistent services, "
+ "check your ipvs configuration\n");
+ return NULL;
+ }
+
+ sched = rcu_dereference(svc->scheduler);
+ dest = sched->schedule(svc, skb, iph);
+ if (dest == NULL) {
+ IP_VS_DBG(1, "Schedule: no dest found.\n");
+ return NULL;
+ }
+
+ flags = (svc->flags & IP_VS_SVC_F_ONEPACKET
+ && iph->protocol == IPPROTO_UDP) ?
+ IP_VS_CONN_F_ONE_PACKET : 0;
+
+ /*
+ * Create a connection entry.
+ */
+ {
+ struct ip_vs_conn_param p;
+
+ ip_vs_conn_fill_param(svc->net, svc->af, iph->protocol,
+ &iph->saddr, pptr[0], &iph->daddr,
+ pptr[1], &p);
+ cp = ip_vs_conn_new(&p, dest->af, &dest->addr,
+ dest->port ? dest->port : pptr[1],
+ flags, dest, skb->mark);
+ if (!cp) {
+ *ignored = -1;
+ return NULL;
+ }
+ }
+
+ IP_VS_DBG_BUF(6, "Schedule fwd:%c c:%s:%u v:%s:%u "
+ "d:%s:%u conn->flags:%X conn->refcnt:%d\n",
+ ip_vs_fwd_tag(cp),
+ IP_VS_DBG_ADDR(cp->af, &cp->caddr), ntohs(cp->cport),
+ IP_VS_DBG_ADDR(cp->af, &cp->vaddr), ntohs(cp->vport),
+ IP_VS_DBG_ADDR(cp->daf, &cp->daddr), ntohs(cp->dport),
+ cp->flags, atomic_read(&cp->refcnt));
+
+ ip_vs_conn_stats(cp, svc);
+ return cp;
+}
+
+
+/*
+ * Pass or drop the packet.
+ * Called by ip_vs_in, when the virtual service is available but
+ * no destination is available for a new connection.
+ */
+int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
+ struct ip_vs_proto_data *pd, struct ip_vs_iphdr *iph)
+{
+ __be16 _ports[2], *pptr;
+#ifdef CONFIG_SYSCTL
+ struct net *net;
+ struct netns_ipvs *ipvs;
+ int unicast;
+#endif
+
+ pptr = frag_safe_skb_hp(skb, iph->len, sizeof(_ports), _ports, iph);
+ if (pptr == NULL) {
+ return NF_DROP;
+ }
+
+#ifdef CONFIG_SYSCTL
+ net = skb_net(skb);
+
+#ifdef CONFIG_IP_VS_IPV6
+ if (svc->af == AF_INET6)
+ unicast = ipv6_addr_type(&iph->daddr.in6) & IPV6_ADDR_UNICAST;
+ else
+#endif
+ unicast = (inet_addr_type(net, iph->daddr.ip) == RTN_UNICAST);
+
+ /* if it is fwmark-based service, the cache_bypass sysctl is up
+ and the destination is a non-local unicast, then create
+ a cache_bypass connection entry */
+ ipvs = net_ipvs(net);
+ if (ipvs->sysctl_cache_bypass && svc->fwmark && unicast) {
+ int ret;
+ struct ip_vs_conn *cp;
+ unsigned int flags = (svc->flags & IP_VS_SVC_F_ONEPACKET &&
+ iph->protocol == IPPROTO_UDP) ?
+ IP_VS_CONN_F_ONE_PACKET : 0;
+ union nf_inet_addr daddr = { .all = { 0, 0, 0, 0 } };
+
+ /* create a new connection entry */
+ IP_VS_DBG(6, "%s(): create a cache_bypass entry\n", __func__);
+ {
+ struct ip_vs_conn_param p;
+ ip_vs_conn_fill_param(svc->net, svc->af, iph->protocol,
+ &iph->saddr, pptr[0],
+ &iph->daddr, pptr[1], &p);
+ cp = ip_vs_conn_new(&p, svc->af, &daddr, 0,
+ IP_VS_CONN_F_BYPASS | flags,
+ NULL, skb->mark);
+ if (!cp)
+ return NF_DROP;
+ }
+
+ /* statistics */
+ ip_vs_in_stats(cp, skb);
+
+ /* set state */
+ ip_vs_set_state(cp, IP_VS_DIR_INPUT, skb, pd);
+
+ /* transmit the first SYN packet */
+ ret = cp->packet_xmit(skb, cp, pd->pp, iph);
+ /* do not touch skb anymore */
+
+ atomic_inc(&cp->in_pkts);
+ ip_vs_conn_put(cp);
+ return ret;
+ }
+#endif
+
+ /*
+ * When the virtual ftp service is presented, packets destined
+ * for other services on the VIP may get here (except services
+ * listed in the ipvs table), pass the packets, because it is
+ * not ipvs job to decide to drop the packets.
+ */
+ if ((svc->port == FTPPORT) && (pptr[1] != FTPPORT))
+ return NF_ACCEPT;
+
+ /*
+ * Notify the client that the destination is unreachable, and
+ * release the socket buffer.
+ * Since it is in IP layer, the TCP socket is not actually
+ * created, the TCP RST packet cannot be sent, instead that
+ * ICMP_PORT_UNREACH is sent here no matter it is TCP/UDP. --WZ
+ */
+#ifdef CONFIG_IP_VS_IPV6
+ if (svc->af == AF_INET6) {
+ if (!skb->dev) {
+ struct net *net_ = dev_net(skb_dst(skb)->dev);
+
+ skb->dev = net_->loopback_dev;
+ }
+ icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
+ } else
+#endif
+ icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
+
+ return NF_DROP;
+}
+
+#ifdef CONFIG_SYSCTL
+
+static int sysctl_snat_reroute(struct sk_buff *skb)
+{
+ struct netns_ipvs *ipvs = net_ipvs(skb_net(skb));
+ return ipvs->sysctl_snat_reroute;
+}
+
+static int sysctl_nat_icmp_send(struct net *net)
+{
+ struct netns_ipvs *ipvs = net_ipvs(net);
+ return ipvs->sysctl_nat_icmp_send;
+}
+
+static int sysctl_expire_nodest_conn(struct netns_ipvs *ipvs)
+{
+ return ipvs->sysctl_expire_nodest_conn;
+}
+
+#else
+
+static int sysctl_snat_reroute(struct sk_buff *skb) { return 0; }
+static int sysctl_nat_icmp_send(struct net *net) { return 0; }
+static int sysctl_expire_nodest_conn(struct netns_ipvs *ipvs) { return 0; }
+
+#endif
+
+__sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset)
+{
+ return csum_fold(skb_checksum(skb, offset, skb->len - offset, 0));
+}
+
+static inline enum ip_defrag_users ip_vs_defrag_user(unsigned int hooknum)
+{
+ if (NF_INET_LOCAL_IN == hooknum)
+ return IP_DEFRAG_VS_IN;
+ if (NF_INET_FORWARD == hooknum)
+ return IP_DEFRAG_VS_FWD;
+ return IP_DEFRAG_VS_OUT;
+}
+
+static inline int ip_vs_gather_frags(struct sk_buff *skb, u_int32_t user)
+{
+ int err;
+
+ local_bh_disable();
+ err = ip_defrag(skb, user);
+ local_bh_enable();
+ if (!err)
+ ip_send_check(ip_hdr(skb));
+
+ return err;
+}
+
+static int ip_vs_route_me_harder(int af, struct sk_buff *skb,
+ unsigned int hooknum)
+{
+ if (!sysctl_snat_reroute(skb))
+ return 0;
+ /* Reroute replies only to remote clients (FORWARD and LOCAL_OUT) */
+ if (NF_INET_LOCAL_IN == hooknum)
+ return 0;
+#ifdef CONFIG_IP_VS_IPV6
+ if (af == AF_INET6) {
+ struct dst_entry *dst = skb_dst(skb);
+
+ if (dst->dev && !(dst->dev->flags & IFF_LOOPBACK) &&
+ ip6_route_me_harder(skb) != 0)
+ return 1;
+ } else
+#endif
+ if (!(skb_rtable(skb)->rt_flags & RTCF_LOCAL) &&
+ ip_route_me_harder(skb, RTN_LOCAL) != 0)
+ return 1;
+
+ return 0;
+}
+
+/*
+ * Packet has been made sufficiently writable in caller
+ * - inout: 1=in->out, 0=out->in
+ */
+void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp,
+ struct ip_vs_conn *cp, int inout)
+{
+ struct iphdr *iph = ip_hdr(skb);
+ unsigned int icmp_offset = iph->ihl*4;
+ struct icmphdr *icmph = (struct icmphdr *)(skb_network_header(skb) +
+ icmp_offset);
+ struct iphdr *ciph = (struct iphdr *)(icmph + 1);
+
+ if (inout) {
+ iph->saddr = cp->vaddr.ip;
+ ip_send_check(iph);
+ ciph->daddr = cp->vaddr.ip;
+ ip_send_check(ciph);
+ } else {
+ iph->daddr = cp->daddr.ip;
+ ip_send_check(iph);
+ ciph->saddr = cp->daddr.ip;
+ ip_send_check(ciph);
+ }
+
+ /* the TCP/UDP/SCTP port */
+ if (IPPROTO_TCP == ciph->protocol || IPPROTO_UDP == ciph->protocol ||
+ IPPROTO_SCTP == ciph->protocol) {
+ __be16 *ports = (void *)ciph + ciph->ihl*4;
+
+ if (inout)
+ ports[1] = cp->vport;
+ else
+ ports[0] = cp->dport;
+ }
+
+ /* And finally the ICMP checksum */
+ icmph->checksum = 0;
+ icmph->checksum = ip_vs_checksum_complete(skb, icmp_offset);
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+
+ if (inout)
+ IP_VS_DBG_PKT(11, AF_INET, pp, skb, (void *)ciph - (void *)iph,
+ "Forwarding altered outgoing ICMP");
+ else
+ IP_VS_DBG_PKT(11, AF_INET, pp, skb, (void *)ciph - (void *)iph,
+ "Forwarding altered incoming ICMP");
+}
+
+#ifdef CONFIG_IP_VS_IPV6
+void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp,
+ struct ip_vs_conn *cp, int inout)
+{
+ struct ipv6hdr *iph = ipv6_hdr(skb);
+ unsigned int icmp_offset = 0;
+ unsigned int offs = 0; /* header offset*/
+ int protocol;
+ struct icmp6hdr *icmph;
+ struct ipv6hdr *ciph;
+ unsigned short fragoffs;
+
+ ipv6_find_hdr(skb, &icmp_offset, IPPROTO_ICMPV6, &fragoffs, NULL);
+ icmph = (struct icmp6hdr *)(skb_network_header(skb) + icmp_offset);
+ offs = icmp_offset + sizeof(struct icmp6hdr);
+ ciph = (struct ipv6hdr *)(skb_network_header(skb) + offs);
+
+ protocol = ipv6_find_hdr(skb, &offs, -1, &fragoffs, NULL);
+
+ if (inout) {
+ iph->saddr = cp->vaddr.in6;
+ ciph->daddr = cp->vaddr.in6;
+ } else {
+ iph->daddr = cp->daddr.in6;
+ ciph->saddr = cp->daddr.in6;
+ }
+
+ /* the TCP/UDP/SCTP port */
+ if (!fragoffs && (IPPROTO_TCP == protocol || IPPROTO_UDP == protocol ||
+ IPPROTO_SCTP == protocol)) {
+ __be16 *ports = (void *)(skb_network_header(skb) + offs);
+
+ IP_VS_DBG(11, "%s() changed port %d to %d\n", __func__,
+ ntohs(inout ? ports[1] : ports[0]),
+ ntohs(inout ? cp->vport : cp->dport));
+ if (inout)
+ ports[1] = cp->vport;
+ else
+ ports[0] = cp->dport;
+ }
+
+ /* And finally the ICMP checksum */
+ icmph->icmp6_cksum = ~csum_ipv6_magic(&iph->saddr, &iph->daddr,
+ skb->len - icmp_offset,
+ IPPROTO_ICMPV6, 0);
+ skb->csum_start = skb_network_header(skb) - skb->head + icmp_offset;
+ skb->csum_offset = offsetof(struct icmp6hdr, icmp6_cksum);
+ skb->ip_summed = CHECKSUM_PARTIAL;
+
+ if (inout)
+ IP_VS_DBG_PKT(11, AF_INET6, pp, skb,
+ (void *)ciph - (void *)iph,
+ "Forwarding altered outgoing ICMPv6");
+ else
+ IP_VS_DBG_PKT(11, AF_INET6, pp, skb,
+ (void *)ciph - (void *)iph,
+ "Forwarding altered incoming ICMPv6");
+}
+#endif
+
+/* Handle relevant response ICMP messages - forward to the right
+ * destination host.
+ */
+static int handle_response_icmp(int af, struct sk_buff *skb,
+ union nf_inet_addr *snet,
+ __u8 protocol, struct ip_vs_conn *cp,
+ struct ip_vs_protocol *pp,
+ unsigned int offset, unsigned int ihl,
+ unsigned int hooknum)
+{
+ unsigned int verdict = NF_DROP;
+
+ if (IP_VS_FWD_METHOD(cp) != 0) {
+ pr_err("shouldn't reach here, because the box is on the "
+ "half connection in the tun/dr module.\n");
+ }
+
+ /* Ensure the checksum is correct */
+ if (!skb_csum_unnecessary(skb) && ip_vs_checksum_complete(skb, ihl)) {
+ /* Failed checksum! */
+ IP_VS_DBG_BUF(1, "Forward ICMP: failed checksum from %s!\n",
+ IP_VS_DBG_ADDR(af, snet));
+ goto out;
+ }
+
+ if (IPPROTO_TCP == protocol || IPPROTO_UDP == protocol ||
+ IPPROTO_SCTP == protocol)
+ offset += 2 * sizeof(__u16);
+ if (!skb_make_writable(skb, offset))
+ goto out;
+
+#ifdef CONFIG_IP_VS_IPV6
+ if (af == AF_INET6)
+ ip_vs_nat_icmp_v6(skb, pp, cp, 1);
+ else
+#endif
+ ip_vs_nat_icmp(skb, pp, cp, 1);
+
+ if (ip_vs_route_me_harder(af, skb, hooknum))
+ goto out;
+
+ /* do the statistics and put it back */
+ ip_vs_out_stats(cp, skb);
+
+ skb->ipvs_property = 1;
+ if (!(cp->flags & IP_VS_CONN_F_NFCT))
+ ip_vs_notrack(skb);
+ else
+ ip_vs_update_conntrack(skb, cp, 0);
+ verdict = NF_ACCEPT;
+
+out:
+ __ip_vs_conn_put(cp);
+
+ return verdict;
+}
+
+/*
+ * Handle ICMP messages in the inside-to-outside direction (outgoing).
+ * Find any that might be relevant, check against existing connections.
+ * Currently handles error types - unreachable, quench, ttl exceeded.
+ */
+static int ip_vs_out_icmp(struct sk_buff *skb, int *related,
+ unsigned int hooknum)
+{
+ struct iphdr *iph;
+ struct icmphdr _icmph, *ic;
+ struct iphdr _ciph, *cih; /* The ip header contained within the ICMP */
+ struct ip_vs_iphdr ciph;
+ struct ip_vs_conn *cp;
+ struct ip_vs_protocol *pp;
+ unsigned int offset, ihl;
+ union nf_inet_addr snet;
+
+ *related = 1;
+
+ /* reassemble IP fragments */
+ if (ip_is_fragment(ip_hdr(skb))) {
+ if (ip_vs_gather_frags(skb, ip_vs_defrag_user(hooknum)))
+ return NF_STOLEN;
+ }
+
+ iph = ip_hdr(skb);
+ offset = ihl = iph->ihl * 4;
+ ic = skb_header_pointer(skb, offset, sizeof(_icmph), &_icmph);
+ if (ic == NULL)
+ return NF_DROP;
+
+ IP_VS_DBG(12, "Outgoing ICMP (%d,%d) %pI4->%pI4\n",
+ ic->type, ntohs(icmp_id(ic)),
+ &iph->saddr, &iph->daddr);
+
+ /*
+ * Work through seeing if this is for us.
+ * These checks are supposed to be in an order that means easy
+ * things are checked first to speed up processing.... however
+ * this means that some packets will manage to get a long way
+ * down this stack and then be rejected, but that's life.
+ */
+ if ((ic->type != ICMP_DEST_UNREACH) &&
+ (ic->type != ICMP_SOURCE_QUENCH) &&
+ (ic->type != ICMP_TIME_EXCEEDED)) {
+ *related = 0;
+ return NF_ACCEPT;
+ }
+
+ /* Now find the contained IP header */
+ offset += sizeof(_icmph);
+ cih = skb_header_pointer(skb, offset, sizeof(_ciph), &_ciph);
+ if (cih == NULL)
+ return NF_ACCEPT; /* The packet looks wrong, ignore */
+
+ pp = ip_vs_proto_get(cih->protocol);
+ if (!pp)
+ return NF_ACCEPT;
+
+ /* Is the embedded protocol header present? */
+ if (unlikely(cih->frag_off & htons(IP_OFFSET) &&
+ pp->dont_defrag))
+ return NF_ACCEPT;
+
+ IP_VS_DBG_PKT(11, AF_INET, pp, skb, offset,
+ "Checking outgoing ICMP for");
+
+ ip_vs_fill_ip4hdr(cih, &ciph);
+ ciph.len += offset;
+ /* The embedded headers contain source and dest in reverse order */
+ cp = pp->conn_out_get(AF_INET, skb, &ciph, 1);
+ if (!cp)
+ return NF_ACCEPT;
+
+ snet.ip = iph->saddr;
+ return handle_response_icmp(AF_INET, skb, &snet, cih->protocol, cp,
+ pp, ciph.len, ihl, hooknum);
+}
+
+#ifdef CONFIG_IP_VS_IPV6
+static int ip_vs_out_icmp_v6(struct sk_buff *skb, int *related,
+ unsigned int hooknum, struct ip_vs_iphdr *ipvsh)
+{
+ struct icmp6hdr _icmph, *ic;
+ struct ipv6hdr _ip6h, *ip6h; /* The ip header contained within ICMP */
+ struct ip_vs_iphdr ciph = {.flags = 0, .fragoffs = 0};/*Contained IP */
+ struct ip_vs_conn *cp;
+ struct ip_vs_protocol *pp;
+ union nf_inet_addr snet;
+ unsigned int writable;
+
+ *related = 1;
+ ic = frag_safe_skb_hp(skb, ipvsh->len, sizeof(_icmph), &_icmph, ipvsh);
+ if (ic == NULL)
+ return NF_DROP;
+
+ /*
+ * Work through seeing if this is for us.
+ * These checks are supposed to be in an order that means easy
+ * things are checked first to speed up processing.... however
+ * this means that some packets will manage to get a long way
+ * down this stack and then be rejected, but that's life.
+ */
+ if (ic->icmp6_type & ICMPV6_INFOMSG_MASK) {
+ *related = 0;
+ return NF_ACCEPT;
+ }
+ /* Fragment header that is before ICMP header tells us that:
+ * it's not an error message since they can't be fragmented.
+ */
+ if (ipvsh->flags & IP6_FH_F_FRAG)
+ return NF_DROP;
+
+ IP_VS_DBG(8, "Outgoing ICMPv6 (%d,%d) %pI6c->%pI6c\n",
+ ic->icmp6_type, ntohs(icmpv6_id(ic)),
+ &ipvsh->saddr, &ipvsh->daddr);
+
+ /* Now find the contained IP header */
+ ciph.len = ipvsh->len + sizeof(_icmph);
+ ip6h = skb_header_pointer(skb, ciph.len, sizeof(_ip6h), &_ip6h);
+ if (ip6h == NULL)
+ return NF_ACCEPT; /* The packet looks wrong, ignore */
+ ciph.saddr.in6 = ip6h->saddr; /* conn_out_get() handles reverse order */
+ ciph.daddr.in6 = ip6h->daddr;
+ /* skip possible IPv6 exthdrs of contained IPv6 packet */
+ ciph.protocol = ipv6_find_hdr(skb, &ciph.len, -1, &ciph.fragoffs, NULL);
+ if (ciph.protocol < 0)
+ return NF_ACCEPT; /* Contained IPv6 hdr looks wrong, ignore */
+
+ pp = ip_vs_proto_get(ciph.protocol);
+ if (!pp)
+ return NF_ACCEPT;
+
+ /* The embedded headers contain source and dest in reverse order */
+ cp = pp->conn_out_get(AF_INET6, skb, &ciph, 1);
+ if (!cp)
+ return NF_ACCEPT;
+
+ snet.in6 = ciph.saddr.in6;
+ writable = ciph.len;
+ return handle_response_icmp(AF_INET6, skb, &snet, ciph.protocol, cp,
+ pp, writable, sizeof(struct ipv6hdr),
+ hooknum);
+}
+#endif
+
+/*
+ * Check if sctp chunc is ABORT chunk
+ */
+static inline int is_sctp_abort(const struct sk_buff *skb, int nh_len)
+{
+ sctp_chunkhdr_t *sch, schunk;
+ sch = skb_header_pointer(skb, nh_len + sizeof(sctp_sctphdr_t),
+ sizeof(schunk), &schunk);
+ if (sch == NULL)
+ return 0;
+ if (sch->type == SCTP_CID_ABORT)
+ return 1;
+ return 0;
+}
+
+static inline int is_tcp_reset(const struct sk_buff *skb, int nh_len)
+{
+ struct tcphdr _tcph, *th;
+
+ th = skb_header_pointer(skb, nh_len, sizeof(_tcph), &_tcph);
+ if (th == NULL)
+ return 0;
+ return th->rst;
+}
+
+static inline bool is_new_conn(const struct sk_buff *skb,
+ struct ip_vs_iphdr *iph)
+{
+ switch (iph->protocol) {
+ case IPPROTO_TCP: {
+ struct tcphdr _tcph, *th;
+
+ th = skb_header_pointer(skb, iph->len, sizeof(_tcph), &_tcph);
+ if (th == NULL)
+ return false;
+ return th->syn;
+ }
+ case IPPROTO_SCTP: {
+ sctp_chunkhdr_t *sch, schunk;
+
+ sch = skb_header_pointer(skb, iph->len + sizeof(sctp_sctphdr_t),
+ sizeof(schunk), &schunk);
+ if (sch == NULL)
+ return false;
+ return sch->type == SCTP_CID_INIT;
+ }
+ default:
+ return false;
+ }
+}
+
+static inline bool is_new_conn_expected(const struct ip_vs_conn *cp,
+ int conn_reuse_mode)
+{
+ /* Controlled (FTP DATA or persistence)? */
+ if (cp->control)
+ return false;
+
+ switch (cp->protocol) {
+ case IPPROTO_TCP:
+ return (cp->state == IP_VS_TCP_S_TIME_WAIT) ||
+ ((conn_reuse_mode & 2) &&
+ (cp->state == IP_VS_TCP_S_FIN_WAIT) &&
+ (cp->flags & IP_VS_CONN_F_NOOUTPUT));
+ case IPPROTO_SCTP:
+ return cp->state == IP_VS_SCTP_S_CLOSED;
+ default:
+ return false;
+ }
+}
+
+/* Handle response packets: rewrite addresses and send away...
+ */
+static unsigned int
+handle_response(int af, struct sk_buff *skb, struct ip_vs_proto_data *pd,
+ struct ip_vs_conn *cp, struct ip_vs_iphdr *iph,
+ unsigned int hooknum)
+{
+ struct ip_vs_protocol *pp = pd->pp;
+
+ IP_VS_DBG_PKT(11, af, pp, skb, 0, "Outgoing packet");
+
+ if (!skb_make_writable(skb, iph->len))
+ goto drop;
+
+ /* mangle the packet */
+ if (pp->snat_handler && !pp->snat_handler(skb, pp, cp, iph))
+ goto drop;
+
+#ifdef CONFIG_IP_VS_IPV6
+ if (af == AF_INET6)
+ ipv6_hdr(skb)->saddr = cp->vaddr.in6;
+ else
+#endif
+ {
+ ip_hdr(skb)->saddr = cp->vaddr.ip;
+ ip_send_check(ip_hdr(skb));
+ }
+
+ /*
+ * nf_iterate does not expect change in the skb->dst->dev.
+ * It looks like it is not fatal to enable this code for hooks
+ * where our handlers are at the end of the chain list and
+ * when all next handlers use skb->dst->dev and not outdev.
+ * It will definitely route properly the inout NAT traffic
+ * when multiple paths are used.
+ */
+
+ /* For policy routing, packets originating from this
+ * machine itself may be routed differently to packets
+ * passing through. We want this packet to be routed as
+ * if it came from this machine itself. So re-compute
+ * the routing information.
+ */
+ if (ip_vs_route_me_harder(af, skb, hooknum))
+ goto drop;
+
+ IP_VS_DBG_PKT(10, af, pp, skb, 0, "After SNAT");
+
+ ip_vs_out_stats(cp, skb);
+ ip_vs_set_state(cp, IP_VS_DIR_OUTPUT, skb, pd);
+ skb->ipvs_property = 1;
+ if (!(cp->flags & IP_VS_CONN_F_NFCT))
+ ip_vs_notrack(skb);
+ else
+ ip_vs_update_conntrack(skb, cp, 0);
+ ip_vs_conn_put(cp);
+
+ LeaveFunction(11);
+ return NF_ACCEPT;
+
+drop:
+ ip_vs_conn_put(cp);
+ kfree_skb(skb);
+ LeaveFunction(11);
+ return NF_STOLEN;
+}
+
+/*
+ * Check if outgoing packet belongs to the established ip_vs_conn.
+ */
+static unsigned int
+ip_vs_out(unsigned int hooknum, struct sk_buff *skb, int af)
+{
+ struct net *net = NULL;
+ struct ip_vs_iphdr iph;
+ struct ip_vs_protocol *pp;
+ struct ip_vs_proto_data *pd;
+ struct ip_vs_conn *cp;
+
+ EnterFunction(11);
+
+ /* Already marked as IPVS request or reply? */
+ if (skb->ipvs_property)
+ return NF_ACCEPT;
+
+ /* Bad... Do not break raw sockets */
+ if (unlikely(skb->sk != NULL && hooknum == NF_INET_LOCAL_OUT &&
+ af == AF_INET)) {
+ struct sock *sk = skb->sk;
+ struct inet_sock *inet = inet_sk(skb->sk);
+
+ if (inet && sk->sk_family == PF_INET && inet->nodefrag)
+ return NF_ACCEPT;
+ }
+
+ if (unlikely(!skb_dst(skb)))
+ return NF_ACCEPT;
+
+ net = skb_net(skb);
+ if (!net_ipvs(net)->enable)
+ return NF_ACCEPT;
+
+ ip_vs_fill_iph_skb(af, skb, &iph);
+#ifdef CONFIG_IP_VS_IPV6
+ if (af == AF_INET6) {
+ if (unlikely(iph.protocol == IPPROTO_ICMPV6)) {
+ int related;
+ int verdict = ip_vs_out_icmp_v6(skb, &related,
+ hooknum, &iph);
+
+ if (related)
+ return verdict;
+ }
+ } else
+#endif
+ if (unlikely(iph.protocol == IPPROTO_ICMP)) {
+ int related;
+ int verdict = ip_vs_out_icmp(skb, &related, hooknum);
+
+ if (related)
+ return verdict;
+ }
+
+ pd = ip_vs_proto_data_get(net, iph.protocol);
+ if (unlikely(!pd))
+ return NF_ACCEPT;
+ pp = pd->pp;
+
+ /* reassemble IP fragments */
+#ifdef CONFIG_IP_VS_IPV6
+ if (af == AF_INET)
+#endif
+ if (unlikely(ip_is_fragment(ip_hdr(skb)) && !pp->dont_defrag)) {
+ if (ip_vs_gather_frags(skb,
+ ip_vs_defrag_user(hooknum)))
+ return NF_STOLEN;
+
+ ip_vs_fill_ip4hdr(skb_network_header(skb), &iph);
+ }
+
+ /*
+ * Check if the packet belongs to an existing entry
+ */
+ cp = pp->conn_out_get(af, skb, &iph, 0);
+
+ if (likely(cp))
+ return handle_response(af, skb, pd, cp, &iph, hooknum);
+ if (sysctl_nat_icmp_send(net) &&
+ (pp->protocol == IPPROTO_TCP ||
+ pp->protocol == IPPROTO_UDP ||
+ pp->protocol == IPPROTO_SCTP)) {
+ __be16 _ports[2], *pptr;
+
+ pptr = frag_safe_skb_hp(skb, iph.len,
+ sizeof(_ports), _ports, &iph);
+ if (pptr == NULL)
+ return NF_ACCEPT; /* Not for me */
+ if (ip_vs_has_real_service(net, af, iph.protocol, &iph.saddr,
+ pptr[0])) {
+ /*
+ * Notify the real server: there is no
+ * existing entry if it is not RST
+ * packet or not TCP packet.
+ */
+ if ((iph.protocol != IPPROTO_TCP &&
+ iph.protocol != IPPROTO_SCTP)
+ || ((iph.protocol == IPPROTO_TCP
+ && !is_tcp_reset(skb, iph.len))
+ || (iph.protocol == IPPROTO_SCTP
+ && !is_sctp_abort(skb,
+ iph.len)))) {
+#ifdef CONFIG_IP_VS_IPV6
+ if (af == AF_INET6) {
+ if (!skb->dev)
+ skb->dev = net->loopback_dev;
+ icmpv6_send(skb,
+ ICMPV6_DEST_UNREACH,
+ ICMPV6_PORT_UNREACH,
+ 0);
+ } else
+#endif
+ icmp_send(skb,
+ ICMP_DEST_UNREACH,
+ ICMP_PORT_UNREACH, 0);
+ return NF_DROP;
+ }
+ }
+ }
+ IP_VS_DBG_PKT(12, af, pp, skb, 0,
+ "ip_vs_out: packet continues traversal as normal");
+ return NF_ACCEPT;
+}
+
+/*
+ * It is hooked at the NF_INET_FORWARD and NF_INET_LOCAL_IN chain,
+ * used only for VS/NAT.
+ * Check if packet is reply for established ip_vs_conn.
+ */
+static unsigned int
+ip_vs_reply4(const struct nf_hook_ops *ops, struct sk_buff *skb,
+ const struct nf_hook_state *state)
+{
+ return ip_vs_out(ops->hooknum, skb, AF_INET);
+}
+
+/*
+ * It is hooked at the NF_INET_LOCAL_OUT chain, used only for VS/NAT.
+ * Check if packet is reply for established ip_vs_conn.
+ */
+static unsigned int
+ip_vs_local_reply4(const struct nf_hook_ops *ops, struct sk_buff *skb,
+ const struct nf_hook_state *state)
+{
+ return ip_vs_out(ops->hooknum, skb, AF_INET);
+}
+
+#ifdef CONFIG_IP_VS_IPV6
+
+/*
+ * It is hooked at the NF_INET_FORWARD and NF_INET_LOCAL_IN chain,
+ * used only for VS/NAT.
+ * Check if packet is reply for established ip_vs_conn.
+ */
+static unsigned int
+ip_vs_reply6(const struct nf_hook_ops *ops, struct sk_buff *skb,
+ const struct nf_hook_state *state)
+{
+ return ip_vs_out(ops->hooknum, skb, AF_INET6);
+}
+
+/*
+ * It is hooked at the NF_INET_LOCAL_OUT chain, used only for VS/NAT.
+ * Check if packet is reply for established ip_vs_conn.
+ */
+static unsigned int
+ip_vs_local_reply6(const struct nf_hook_ops *ops, struct sk_buff *skb,
+ const struct nf_hook_state *state)
+{
+ return ip_vs_out(ops->hooknum, skb, AF_INET6);
+}
+
+#endif
+
+/*
+ * Handle ICMP messages in the outside-to-inside direction (incoming).
+ * Find any that might be relevant, check against existing connections,
+ * forward to the right destination host if relevant.
+ * Currently handles error types - unreachable, quench, ttl exceeded.
+ */
+static int
+ip_vs_in_icmp(struct sk_buff *skb, int *related, unsigned int hooknum)
+{
+ struct net *net = NULL;
+ struct iphdr *iph;
+ struct icmphdr _icmph, *ic;
+ struct iphdr _ciph, *cih; /* The ip header contained within the ICMP */
+ struct ip_vs_iphdr ciph;
+ struct ip_vs_conn *cp;
+ struct ip_vs_protocol *pp;
+ struct ip_vs_proto_data *pd;
+ unsigned int offset, offset2, ihl, verdict;
+ bool ipip;
+
+ *related = 1;
+
+ /* reassemble IP fragments */
+ if (ip_is_fragment(ip_hdr(skb))) {
+ if (ip_vs_gather_frags(skb, ip_vs_defrag_user(hooknum)))
+ return NF_STOLEN;
+ }
+
+ iph = ip_hdr(skb);
+ offset = ihl = iph->ihl * 4;
+ ic = skb_header_pointer(skb, offset, sizeof(_icmph), &_icmph);
+ if (ic == NULL)
+ return NF_DROP;
+
+ IP_VS_DBG(12, "Incoming ICMP (%d,%d) %pI4->%pI4\n",
+ ic->type, ntohs(icmp_id(ic)),
+ &iph->saddr, &iph->daddr);
+
+ /*
+ * Work through seeing if this is for us.
+ * These checks are supposed to be in an order that means easy
+ * things are checked first to speed up processing.... however
+ * this means that some packets will manage to get a long way
+ * down this stack and then be rejected, but that's life.
+ */
+ if ((ic->type != ICMP_DEST_UNREACH) &&
+ (ic->type != ICMP_SOURCE_QUENCH) &&
+ (ic->type != ICMP_TIME_EXCEEDED)) {
+ *related = 0;
+ return NF_ACCEPT;
+ }
+
+ /* Now find the contained IP header */
+ offset += sizeof(_icmph);
+ cih = skb_header_pointer(skb, offset, sizeof(_ciph), &_ciph);
+ if (cih == NULL)
+ return NF_ACCEPT; /* The packet looks wrong, ignore */
+
+ net = skb_net(skb);
+
+ /* Special case for errors for IPIP packets */
+ ipip = false;
+ if (cih->protocol == IPPROTO_IPIP) {
+ if (unlikely(cih->frag_off & htons(IP_OFFSET)))
+ return NF_ACCEPT;
+ /* Error for our IPIP must arrive at LOCAL_IN */
+ if (!(skb_rtable(skb)->rt_flags & RTCF_LOCAL))
+ return NF_ACCEPT;
+ offset += cih->ihl * 4;
+ cih = skb_header_pointer(skb, offset, sizeof(_ciph), &_ciph);
+ if (cih == NULL)
+ return NF_ACCEPT; /* The packet looks wrong, ignore */
+ ipip = true;
+ }
+
+ pd = ip_vs_proto_data_get(net, cih->protocol);
+ if (!pd)
+ return NF_ACCEPT;
+ pp = pd->pp;
+
+ /* Is the embedded protocol header present? */
+ if (unlikely(cih->frag_off & htons(IP_OFFSET) &&
+ pp->dont_defrag))
+ return NF_ACCEPT;
+
+ IP_VS_DBG_PKT(11, AF_INET, pp, skb, offset,
+ "Checking incoming ICMP for");
+
+ offset2 = offset;
+ ip_vs_fill_ip4hdr(cih, &ciph);
+ ciph.len += offset;
+ offset = ciph.len;
+ /* The embedded headers contain source and dest in reverse order.
+ * For IPIP this is error for request, not for reply.
+ */
+ cp = pp->conn_in_get(AF_INET, skb, &ciph, ipip ? 0 : 1);
+ if (!cp)
+ return NF_ACCEPT;
+
+ verdict = NF_DROP;
+
+ /* Ensure the checksum is correct */
+ if (!skb_csum_unnecessary(skb) && ip_vs_checksum_complete(skb, ihl)) {
+ /* Failed checksum! */
+ IP_VS_DBG(1, "Incoming ICMP: failed checksum from %pI4!\n",
+ &iph->saddr);
+ goto out;
+ }
+
+ if (ipip) {
+ __be32 info = ic->un.gateway;
+ __u8 type = ic->type;
+ __u8 code = ic->code;
+
+ /* Update the MTU */
+ if (ic->type == ICMP_DEST_UNREACH &&
+ ic->code == ICMP_FRAG_NEEDED) {
+ struct ip_vs_dest *dest = cp->dest;
+ u32 mtu = ntohs(ic->un.frag.mtu);
+ __be16 frag_off = cih->frag_off;
+
+ /* Strip outer IP and ICMP, go to IPIP header */
+ if (pskb_pull(skb, ihl + sizeof(_icmph)) == NULL)
+ goto ignore_ipip;
+ offset2 -= ihl + sizeof(_icmph);
+ skb_reset_network_header(skb);
+ IP_VS_DBG(12, "ICMP for IPIP %pI4->%pI4: mtu=%u\n",
+ &ip_hdr(skb)->saddr, &ip_hdr(skb)->daddr, mtu);
+ ipv4_update_pmtu(skb, dev_net(skb->dev),
+ mtu, 0, 0, 0, 0);
+ /* Client uses PMTUD? */
+ if (!(frag_off & htons(IP_DF)))
+ goto ignore_ipip;
+ /* Prefer the resulting PMTU */
+ if (dest) {
+ struct ip_vs_dest_dst *dest_dst;
+
+ rcu_read_lock();
+ dest_dst = rcu_dereference(dest->dest_dst);
+ if (dest_dst)
+ mtu = dst_mtu(dest_dst->dst_cache);
+ rcu_read_unlock();
+ }
+ if (mtu > 68 + sizeof(struct iphdr))
+ mtu -= sizeof(struct iphdr);
+ info = htonl(mtu);
+ }
+ /* Strip outer IP, ICMP and IPIP, go to IP header of
+ * original request.
+ */
+ if (pskb_pull(skb, offset2) == NULL)
+ goto ignore_ipip;
+ skb_reset_network_header(skb);
+ IP_VS_DBG(12, "Sending ICMP for %pI4->%pI4: t=%u, c=%u, i=%u\n",
+ &ip_hdr(skb)->saddr, &ip_hdr(skb)->daddr,
+ type, code, ntohl(info));
+ icmp_send(skb, type, code, info);
+ /* ICMP can be shorter but anyways, account it */
+ ip_vs_out_stats(cp, skb);
+
+ignore_ipip:
+ consume_skb(skb);
+ verdict = NF_STOLEN;
+ goto out;
+ }
+
+ /* do the statistics and put it back */
+ ip_vs_in_stats(cp, skb);
+ if (IPPROTO_TCP == cih->protocol || IPPROTO_UDP == cih->protocol ||
+ IPPROTO_SCTP == cih->protocol)
+ offset += 2 * sizeof(__u16);
+ verdict = ip_vs_icmp_xmit(skb, cp, pp, offset, hooknum, &ciph);
+
+out:
+ __ip_vs_conn_put(cp);
+
+ return verdict;
+}
+
+#ifdef CONFIG_IP_VS_IPV6
+static int ip_vs_in_icmp_v6(struct sk_buff *skb, int *related,
+ unsigned int hooknum, struct ip_vs_iphdr *iph)
+{
+ struct net *net = NULL;
+ struct ipv6hdr _ip6h, *ip6h;
+ struct icmp6hdr _icmph, *ic;
+ struct ip_vs_iphdr ciph = {.flags = 0, .fragoffs = 0};/*Contained IP */
+ struct ip_vs_conn *cp;
+ struct ip_vs_protocol *pp;
+ struct ip_vs_proto_data *pd;
+ unsigned int offs_ciph, writable, verdict;
+
+ *related = 1;
+
+ ic = frag_safe_skb_hp(skb, iph->len, sizeof(_icmph), &_icmph, iph);
+ if (ic == NULL)
+ return NF_DROP;
+
+ /*
+ * Work through seeing if this is for us.
+ * These checks are supposed to be in an order that means easy
+ * things are checked first to speed up processing.... however
+ * this means that some packets will manage to get a long way
+ * down this stack and then be rejected, but that's life.
+ */
+ if (ic->icmp6_type & ICMPV6_INFOMSG_MASK) {
+ *related = 0;
+ return NF_ACCEPT;
+ }
+ /* Fragment header that is before ICMP header tells us that:
+ * it's not an error message since they can't be fragmented.
+ */
+ if (iph->flags & IP6_FH_F_FRAG)
+ return NF_DROP;
+
+ IP_VS_DBG(8, "Incoming ICMPv6 (%d,%d) %pI6c->%pI6c\n",
+ ic->icmp6_type, ntohs(icmpv6_id(ic)),
+ &iph->saddr, &iph->daddr);
+
+ /* Now find the contained IP header */
+ ciph.len = iph->len + sizeof(_icmph);
+ offs_ciph = ciph.len; /* Save ip header offset */
+ ip6h = skb_header_pointer(skb, ciph.len, sizeof(_ip6h), &_ip6h);
+ if (ip6h == NULL)
+ return NF_ACCEPT; /* The packet looks wrong, ignore */
+ ciph.saddr.in6 = ip6h->saddr; /* conn_in_get() handles reverse order */
+ ciph.daddr.in6 = ip6h->daddr;
+ /* skip possible IPv6 exthdrs of contained IPv6 packet */
+ ciph.protocol = ipv6_find_hdr(skb, &ciph.len, -1, &ciph.fragoffs, NULL);
+ if (ciph.protocol < 0)
+ return NF_ACCEPT; /* Contained IPv6 hdr looks wrong, ignore */
+
+ net = skb_net(skb);
+ pd = ip_vs_proto_data_get(net, ciph.protocol);
+ if (!pd)
+ return NF_ACCEPT;
+ pp = pd->pp;
+
+ /* Cannot handle fragmented embedded protocol */
+ if (ciph.fragoffs)
+ return NF_ACCEPT;
+
+ IP_VS_DBG_PKT(11, AF_INET6, pp, skb, offs_ciph,
+ "Checking incoming ICMPv6 for");
+
+ /* The embedded headers contain source and dest in reverse order
+ * if not from localhost
+ */
+ cp = pp->conn_in_get(AF_INET6, skb, &ciph,
+ (hooknum == NF_INET_LOCAL_OUT) ? 0 : 1);
+
+ if (!cp)
+ return NF_ACCEPT;
+ /* VS/TUN, VS/DR and LOCALNODE just let it go */
+ if ((hooknum == NF_INET_LOCAL_OUT) &&
+ (IP_VS_FWD_METHOD(cp) != IP_VS_CONN_F_MASQ)) {
+ __ip_vs_conn_put(cp);
+ return NF_ACCEPT;
+ }
+
+ /* do the statistics and put it back */
+ ip_vs_in_stats(cp, skb);
+
+ /* Need to mangle contained IPv6 header in ICMPv6 packet */
+ writable = ciph.len;
+ if (IPPROTO_TCP == ciph.protocol || IPPROTO_UDP == ciph.protocol ||
+ IPPROTO_SCTP == ciph.protocol)
+ writable += 2 * sizeof(__u16); /* Also mangle ports */
+
+ verdict = ip_vs_icmp_xmit_v6(skb, cp, pp, writable, hooknum, &ciph);
+
+ __ip_vs_conn_put(cp);
+
+ return verdict;
+}
+#endif
+
+
+/*
+ * Check if it's for virtual services, look it up,
+ * and send it on its way...
+ */
+static unsigned int
+ip_vs_in(unsigned int hooknum, struct sk_buff *skb, int af)
+{
+ struct net *net;
+ struct ip_vs_iphdr iph;
+ struct ip_vs_protocol *pp;
+ struct ip_vs_proto_data *pd;
+ struct ip_vs_conn *cp;
+ int ret, pkts;
+ struct netns_ipvs *ipvs;
+ int conn_reuse_mode;
+
+ /* Already marked as IPVS request or reply? */
+ if (skb->ipvs_property)
+ return NF_ACCEPT;
+
+ /*
+ * Big tappo:
+ * - remote client: only PACKET_HOST
+ * - route: used for struct net when skb->dev is unset
+ */
+ if (unlikely((skb->pkt_type != PACKET_HOST &&
+ hooknum != NF_INET_LOCAL_OUT) ||
+ !skb_dst(skb))) {
+ ip_vs_fill_iph_skb(af, skb, &iph);
+ IP_VS_DBG_BUF(12, "packet type=%d proto=%d daddr=%s"
+ " ignored in hook %u\n",
+ skb->pkt_type, iph.protocol,
+ IP_VS_DBG_ADDR(af, &iph.daddr), hooknum);
+ return NF_ACCEPT;
+ }
+ /* ipvs enabled in this netns ? */
+ net = skb_net(skb);
+ ipvs = net_ipvs(net);
+ if (unlikely(sysctl_backup_only(ipvs) || !ipvs->enable))
+ return NF_ACCEPT;
+
+ ip_vs_fill_iph_skb(af, skb, &iph);
+
+ /* Bad... Do not break raw sockets */
+ if (unlikely(skb->sk != NULL && hooknum == NF_INET_LOCAL_OUT &&
+ af == AF_INET)) {
+ struct sock *sk = skb->sk;
+ struct inet_sock *inet = inet_sk(skb->sk);
+
+ if (inet && sk->sk_family == PF_INET && inet->nodefrag)
+ return NF_ACCEPT;
+ }
+
+#ifdef CONFIG_IP_VS_IPV6
+ if (af == AF_INET6) {
+ if (unlikely(iph.protocol == IPPROTO_ICMPV6)) {
+ int related;
+ int verdict = ip_vs_in_icmp_v6(skb, &related, hooknum,
+ &iph);
+
+ if (related)
+ return verdict;
+ }
+ } else
+#endif
+ if (unlikely(iph.protocol == IPPROTO_ICMP)) {
+ int related;
+ int verdict = ip_vs_in_icmp(skb, &related, hooknum);
+
+ if (related)
+ return verdict;
+ }
+
+ /* Protocol supported? */
+ pd = ip_vs_proto_data_get(net, iph.protocol);
+ if (unlikely(!pd))
+ return NF_ACCEPT;
+ pp = pd->pp;
+ /*
+ * Check if the packet belongs to an existing connection entry
+ */
+ cp = pp->conn_in_get(af, skb, &iph, 0);
+
+ conn_reuse_mode = sysctl_conn_reuse_mode(ipvs);
+ if (conn_reuse_mode && !iph.fragoffs &&
+ is_new_conn(skb, &iph) && cp &&
+ ((unlikely(sysctl_expire_nodest_conn(ipvs)) && cp->dest &&
+ unlikely(!atomic_read(&cp->dest->weight))) ||
+ unlikely(is_new_conn_expected(cp, conn_reuse_mode)))) {
+ if (!atomic_read(&cp->n_control))
+ ip_vs_conn_expire_now(cp);
+ __ip_vs_conn_put(cp);
+ cp = NULL;
+ }
+
+ if (unlikely(!cp) && !iph.fragoffs) {
+ /* No (second) fragments need to enter here, as nf_defrag_ipv6
+ * replayed fragment zero will already have created the cp
+ */
+ int v;
+
+ /* Schedule and create new connection entry into &cp */
+ if (!pp->conn_schedule(af, skb, pd, &v, &cp, &iph))
+ return v;
+ }
+
+ if (unlikely(!cp)) {
+ /* sorry, all this trouble for a no-hit :) */
+ IP_VS_DBG_PKT(12, af, pp, skb, 0,
+ "ip_vs_in: packet continues traversal as normal");
+ if (iph.fragoffs) {
+ /* Fragment that couldn't be mapped to a conn entry
+ * is missing module nf_defrag_ipv6
+ */
+ IP_VS_DBG_RL("Unhandled frag, load nf_defrag_ipv6\n");
+ IP_VS_DBG_PKT(7, af, pp, skb, 0, "unhandled fragment");
+ }
+ return NF_ACCEPT;
+ }
+
+ IP_VS_DBG_PKT(11, af, pp, skb, 0, "Incoming packet");
+ /* Check the server status */
+ if (cp->dest && !(cp->dest->flags & IP_VS_DEST_F_AVAILABLE)) {
+ /* the destination server is not available */
+
+ if (sysctl_expire_nodest_conn(ipvs)) {
+ /* try to expire the connection immediately */
+ ip_vs_conn_expire_now(cp);
+ }
+ /* don't restart its timer, and silently
+ drop the packet. */
+ __ip_vs_conn_put(cp);
+ return NF_DROP;
+ }
+
+ ip_vs_in_stats(cp, skb);
+ ip_vs_set_state(cp, IP_VS_DIR_INPUT, skb, pd);
+ if (cp->packet_xmit)
+ ret = cp->packet_xmit(skb, cp, pp, &iph);
+ /* do not touch skb anymore */
+ else {
+ IP_VS_DBG_RL("warning: packet_xmit is null");
+ ret = NF_ACCEPT;
+ }
+
+ /* Increase its packet counter and check if it is needed
+ * to be synchronized
+ *
+ * Sync connection if it is about to close to
+ * encorage the standby servers to update the connections timeout
+ *
+ * For ONE_PKT let ip_vs_sync_conn() do the filter work.
+ */
+
+ if (cp->flags & IP_VS_CONN_F_ONE_PACKET)
+ pkts = sysctl_sync_threshold(ipvs);
+ else
+ pkts = atomic_add_return(1, &cp->in_pkts);
+
+ if (ipvs->sync_state & IP_VS_STATE_MASTER)
+ ip_vs_sync_conn(net, cp, pkts);
+
+ ip_vs_conn_put(cp);
+ return ret;
+}
+
+/*
+ * AF_INET handler in NF_INET_LOCAL_IN chain
+ * Schedule and forward packets from remote clients
+ */
+static unsigned int
+ip_vs_remote_request4(const struct nf_hook_ops *ops, struct sk_buff *skb,
+ const struct nf_hook_state *state)
+{
+ return ip_vs_in(ops->hooknum, skb, AF_INET);
+}
+
+/*
+ * AF_INET handler in NF_INET_LOCAL_OUT chain
+ * Schedule and forward packets from local clients
+ */
+static unsigned int
+ip_vs_local_request4(const struct nf_hook_ops *ops, struct sk_buff *skb,
+ const struct nf_hook_state *state)
+{
+ return ip_vs_in(ops->hooknum, skb, AF_INET);
+}
+
+#ifdef CONFIG_IP_VS_IPV6
+
+/*
+ * AF_INET6 handler in NF_INET_LOCAL_IN chain
+ * Schedule and forward packets from remote clients
+ */
+static unsigned int
+ip_vs_remote_request6(const struct nf_hook_ops *ops, struct sk_buff *skb,
+ const struct nf_hook_state *state)
+{
+ return ip_vs_in(ops->hooknum, skb, AF_INET6);
+}
+
+/*
+ * AF_INET6 handler in NF_INET_LOCAL_OUT chain
+ * Schedule and forward packets from local clients
+ */
+static unsigned int
+ip_vs_local_request6(const struct nf_hook_ops *ops, struct sk_buff *skb,
+ const struct nf_hook_state *state)
+{
+ return ip_vs_in(ops->hooknum, skb, AF_INET6);
+}
+
+#endif
+
+
+/*
+ * It is hooked at the NF_INET_FORWARD chain, in order to catch ICMP
+ * related packets destined for 0.0.0.0/0.
+ * When fwmark-based virtual service is used, such as transparent
+ * cache cluster, TCP packets can be marked and routed to ip_vs_in,
+ * but ICMP destined for 0.0.0.0/0 cannot not be easily marked and
+ * sent to ip_vs_in_icmp. So, catch them at the NF_INET_FORWARD chain
+ * and send them to ip_vs_in_icmp.
+ */
+static unsigned int
+ip_vs_forward_icmp(const struct nf_hook_ops *ops, struct sk_buff *skb,
+ const struct nf_hook_state *state)
+{
+ int r;
+ struct net *net;
+ struct netns_ipvs *ipvs;
+
+ if (ip_hdr(skb)->protocol != IPPROTO_ICMP)
+ return NF_ACCEPT;
+
+ /* ipvs enabled in this netns ? */
+ net = skb_net(skb);
+ ipvs = net_ipvs(net);
+ if (unlikely(sysctl_backup_only(ipvs) || !ipvs->enable))
+ return NF_ACCEPT;
+
+ return ip_vs_in_icmp(skb, &r, ops->hooknum);
+}
+
+#ifdef CONFIG_IP_VS_IPV6
+static unsigned int
+ip_vs_forward_icmp_v6(const struct nf_hook_ops *ops, struct sk_buff *skb,
+ const struct nf_hook_state *state)
+{
+ int r;
+ struct net *net;
+ struct netns_ipvs *ipvs;
+ struct ip_vs_iphdr iphdr;
+
+ ip_vs_fill_iph_skb(AF_INET6, skb, &iphdr);
+ if (iphdr.protocol != IPPROTO_ICMPV6)
+ return NF_ACCEPT;
+
+ /* ipvs enabled in this netns ? */
+ net = skb_net(skb);
+ ipvs = net_ipvs(net);
+ if (unlikely(sysctl_backup_only(ipvs) || !ipvs->enable))
+ return NF_ACCEPT;
+
+ return ip_vs_in_icmp_v6(skb, &r, ops->hooknum, &iphdr);
+}
+#endif
+
+
+static struct nf_hook_ops ip_vs_ops[] __read_mostly = {
+ /* After packet filtering, change source only for VS/NAT */
+ {
+ .hook = ip_vs_reply4,
+ .owner = THIS_MODULE,
+ .pf = NFPROTO_IPV4,
+ .hooknum = NF_INET_LOCAL_IN,
+ .priority = NF_IP_PRI_NAT_SRC - 2,
+ },
+ /* After packet filtering, forward packet through VS/DR, VS/TUN,
+ * or VS/NAT(change destination), so that filtering rules can be
+ * applied to IPVS. */
+ {
+ .hook = ip_vs_remote_request4,
+ .owner = THIS_MODULE,
+ .pf = NFPROTO_IPV4,
+ .hooknum = NF_INET_LOCAL_IN,
+ .priority = NF_IP_PRI_NAT_SRC - 1,
+ },
+ /* Before ip_vs_in, change source only for VS/NAT */
+ {
+ .hook = ip_vs_local_reply4,
+ .owner = THIS_MODULE,
+ .pf = NFPROTO_IPV4,
+ .hooknum = NF_INET_LOCAL_OUT,
+ .priority = NF_IP_PRI_NAT_DST + 1,
+ },
+ /* After mangle, schedule and forward local requests */
+ {
+ .hook = ip_vs_local_request4,
+ .owner = THIS_MODULE,
+ .pf = NFPROTO_IPV4,
+ .hooknum = NF_INET_LOCAL_OUT,
+ .priority = NF_IP_PRI_NAT_DST + 2,
+ },
+ /* After packet filtering (but before ip_vs_out_icmp), catch icmp
+ * destined for 0.0.0.0/0, which is for incoming IPVS connections */
+ {
+ .hook = ip_vs_forward_icmp,
+ .owner = THIS_MODULE,
+ .pf = NFPROTO_IPV4,
+ .hooknum = NF_INET_FORWARD,
+ .priority = 99,
+ },
+ /* After packet filtering, change source only for VS/NAT */
+ {
+ .hook = ip_vs_reply4,
+ .owner = THIS_MODULE,
+ .pf = NFPROTO_IPV4,
+ .hooknum = NF_INET_FORWARD,
+ .priority = 100,
+ },
+#ifdef CONFIG_IP_VS_IPV6
+ /* After packet filtering, change source only for VS/NAT */
+ {
+ .hook = ip_vs_reply6,
+ .owner = THIS_MODULE,
+ .pf = NFPROTO_IPV6,
+ .hooknum = NF_INET_LOCAL_IN,
+ .priority = NF_IP6_PRI_NAT_SRC - 2,
+ },
+ /* After packet filtering, forward packet through VS/DR, VS/TUN,
+ * or VS/NAT(change destination), so that filtering rules can be
+ * applied to IPVS. */
+ {
+ .hook = ip_vs_remote_request6,
+ .owner = THIS_MODULE,
+ .pf = NFPROTO_IPV6,
+ .hooknum = NF_INET_LOCAL_IN,
+ .priority = NF_IP6_PRI_NAT_SRC - 1,
+ },
+ /* Before ip_vs_in, change source only for VS/NAT */
+ {
+ .hook = ip_vs_local_reply6,
+ .owner = THIS_MODULE,
+ .pf = NFPROTO_IPV6,
+ .hooknum = NF_INET_LOCAL_OUT,
+ .priority = NF_IP6_PRI_NAT_DST + 1,
+ },
+ /* After mangle, schedule and forward local requests */
+ {
+ .hook = ip_vs_local_request6,
+ .owner = THIS_MODULE,
+ .pf = NFPROTO_IPV6,
+ .hooknum = NF_INET_LOCAL_OUT,
+ .priority = NF_IP6_PRI_NAT_DST + 2,
+ },
+ /* After packet filtering (but before ip_vs_out_icmp), catch icmp
+ * destined for 0.0.0.0/0, which is for incoming IPVS connections */
+ {
+ .hook = ip_vs_forward_icmp_v6,
+ .owner = THIS_MODULE,
+ .pf = NFPROTO_IPV6,
+ .hooknum = NF_INET_FORWARD,
+ .priority = 99,
+ },
+ /* After packet filtering, change source only for VS/NAT */
+ {
+ .hook = ip_vs_reply6,
+ .owner = THIS_MODULE,
+ .pf = NFPROTO_IPV6,
+ .hooknum = NF_INET_FORWARD,
+ .priority = 100,
+ },
+#endif
+};
+/*
+ * Initialize IP Virtual Server netns mem.
+ */
+static int __net_init __ip_vs_init(struct net *net)
+{
+ struct netns_ipvs *ipvs;
+
+ ipvs = net_generic(net, ip_vs_net_id);
+ if (ipvs == NULL)
+ return -ENOMEM;
+
+ /* Hold the beast until a service is registerd */
+ ipvs->enable = 0;
+ ipvs->net = net;
+ /* Counters used for creating unique names */
+ ipvs->gen = atomic_read(&ipvs_netns_cnt);
+ atomic_inc(&ipvs_netns_cnt);
+ net->ipvs = ipvs;
+
+ if (ip_vs_estimator_net_init(net) < 0)
+ goto estimator_fail;
+
+ if (ip_vs_control_net_init(net) < 0)
+ goto control_fail;
+
+ if (ip_vs_protocol_net_init(net) < 0)
+ goto protocol_fail;
+
+ if (ip_vs_app_net_init(net) < 0)
+ goto app_fail;
+
+ if (ip_vs_conn_net_init(net) < 0)
+ goto conn_fail;
+
+ if (ip_vs_sync_net_init(net) < 0)
+ goto sync_fail;
+
+ printk(KERN_INFO "IPVS: Creating netns size=%zu id=%d\n",
+ sizeof(struct netns_ipvs), ipvs->gen);
+ return 0;
+/*
+ * Error handling
+ */
+
+sync_fail:
+ ip_vs_conn_net_cleanup(net);
+conn_fail:
+ ip_vs_app_net_cleanup(net);
+app_fail:
+ ip_vs_protocol_net_cleanup(net);
+protocol_fail:
+ ip_vs_control_net_cleanup(net);
+control_fail:
+ ip_vs_estimator_net_cleanup(net);
+estimator_fail:
+ net->ipvs = NULL;
+ return -ENOMEM;
+}
+
+static void __net_exit __ip_vs_cleanup(struct net *net)
+{
+ ip_vs_service_net_cleanup(net); /* ip_vs_flush() with locks */
+ ip_vs_conn_net_cleanup(net);
+ ip_vs_app_net_cleanup(net);
+ ip_vs_protocol_net_cleanup(net);
+ ip_vs_control_net_cleanup(net);
+ ip_vs_estimator_net_cleanup(net);
+ IP_VS_DBG(2, "ipvs netns %d released\n", net_ipvs(net)->gen);
+ net->ipvs = NULL;
+}
+
+static void __net_exit __ip_vs_dev_cleanup(struct net *net)
+{
+ EnterFunction(2);
+ net_ipvs(net)->enable = 0; /* Disable packet reception */
+ smp_wmb();
+ ip_vs_sync_net_cleanup(net);
+ LeaveFunction(2);
+}
+
+static struct pernet_operations ipvs_core_ops = {
+ .init = __ip_vs_init,
+ .exit = __ip_vs_cleanup,
+ .id = &ip_vs_net_id,
+ .size = sizeof(struct netns_ipvs),
+};
+
+static struct pernet_operations ipvs_core_dev_ops = {
+ .exit = __ip_vs_dev_cleanup,
+};
+
+/*
+ * Initialize IP Virtual Server
+ */
+static int __init ip_vs_init(void)
+{
+ int ret;
+
+ ret = ip_vs_control_init();
+ if (ret < 0) {
+ pr_err("can't setup control.\n");
+ goto exit;
+ }
+
+ ip_vs_protocol_init();
+
+ ret = ip_vs_conn_init();
+ if (ret < 0) {
+ pr_err("can't setup connection table.\n");
+ goto cleanup_protocol;
+ }
+
+ ret = register_pernet_subsys(&ipvs_core_ops); /* Alloc ip_vs struct */
+ if (ret < 0)
+ goto cleanup_conn;
+
+ ret = register_pernet_device(&ipvs_core_dev_ops);
+ if (ret < 0)
+ goto cleanup_sub;
+
+ ret = nf_register_hooks(ip_vs_ops, ARRAY_SIZE(ip_vs_ops));
+ if (ret < 0) {
+ pr_err("can't register hooks.\n");
+ goto cleanup_dev;
+ }
+
+ ret = ip_vs_register_nl_ioctl();
+ if (ret < 0) {
+ pr_err("can't register netlink/ioctl.\n");
+ goto cleanup_hooks;
+ }
+
+ pr_info("ipvs loaded.\n");
+
+ return ret;
+
+cleanup_hooks:
+ nf_unregister_hooks(ip_vs_ops, ARRAY_SIZE(ip_vs_ops));
+cleanup_dev:
+ unregister_pernet_device(&ipvs_core_dev_ops);
+cleanup_sub:
+ unregister_pernet_subsys(&ipvs_core_ops);
+cleanup_conn:
+ ip_vs_conn_cleanup();
+cleanup_protocol:
+ ip_vs_protocol_cleanup();
+ ip_vs_control_cleanup();
+exit:
+ return ret;
+}
+
+static void __exit ip_vs_cleanup(void)
+{
+ ip_vs_unregister_nl_ioctl();
+ nf_unregister_hooks(ip_vs_ops, ARRAY_SIZE(ip_vs_ops));
+ unregister_pernet_device(&ipvs_core_dev_ops);
+ unregister_pernet_subsys(&ipvs_core_ops); /* free ip_vs struct */
+ ip_vs_conn_cleanup();
+ ip_vs_protocol_cleanup();
+ ip_vs_control_cleanup();
+ pr_info("ipvs unloaded.\n");
+}
+
+module_init(ip_vs_init);
+module_exit(ip_vs_cleanup);
+MODULE_LICENSE("GPL");
Code Review / kvmfornfv.git / blobdiff