2408 lines
63 KiB
C
2408 lines
63 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* IPVS An implementation of the IP virtual server support for the
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* LINUX operating system. IPVS is now implemented as a module
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* over the Netfilter framework. IPVS can be used to build a
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* high-performance and highly available server based on a
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* cluster of servers.
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*
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* Authors: Wensong Zhang <wensong@linuxvirtualserver.org>
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* Peter Kese <peter.kese@ijs.si>
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* Julian Anastasov <ja@ssi.bg>
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*
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* The IPVS code for kernel 2.2 was done by Wensong Zhang and Peter Kese,
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* with changes/fixes from Julian Anastasov, Lars Marowsky-Bree, Horms
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* and others.
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*
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* Changes:
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* Paul `Rusty' Russell properly handle non-linear skbs
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* Harald Welte don't use nfcache
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*/
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#define KMSG_COMPONENT "IPVS"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/ip.h>
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#include <linux/tcp.h>
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#include <linux/sctp.h>
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#include <linux/icmp.h>
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#include <linux/slab.h>
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#include <net/ip.h>
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#include <net/tcp.h>
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#include <net/udp.h>
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#include <net/icmp.h> /* for icmp_send */
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#include <net/route.h>
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#include <net/ip6_checksum.h>
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#include <net/netns/generic.h> /* net_generic() */
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#include <linux/netfilter.h>
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#include <linux/netfilter_ipv4.h>
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#ifdef CONFIG_IP_VS_IPV6
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#include <net/ipv6.h>
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#include <linux/netfilter_ipv6.h>
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#include <net/ip6_route.h>
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#endif
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#include <net/ip_vs.h>
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#include <linux/indirect_call_wrapper.h>
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EXPORT_SYMBOL(register_ip_vs_scheduler);
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EXPORT_SYMBOL(unregister_ip_vs_scheduler);
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EXPORT_SYMBOL(ip_vs_proto_name);
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EXPORT_SYMBOL(ip_vs_conn_new);
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EXPORT_SYMBOL(ip_vs_conn_in_get);
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EXPORT_SYMBOL(ip_vs_conn_out_get);
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#ifdef CONFIG_IP_VS_PROTO_TCP
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EXPORT_SYMBOL(ip_vs_tcp_conn_listen);
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#endif
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EXPORT_SYMBOL(ip_vs_conn_put);
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#ifdef CONFIG_IP_VS_DEBUG
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EXPORT_SYMBOL(ip_vs_get_debug_level);
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#endif
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EXPORT_SYMBOL(ip_vs_new_conn_out);
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#ifdef CONFIG_IP_VS_PROTO_TCP
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INDIRECT_CALLABLE_DECLARE(int
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tcp_snat_handler(struct sk_buff *skb, struct ip_vs_protocol *pp,
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struct ip_vs_conn *cp, struct ip_vs_iphdr *iph));
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#endif
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#ifdef CONFIG_IP_VS_PROTO_UDP
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INDIRECT_CALLABLE_DECLARE(int
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udp_snat_handler(struct sk_buff *skb, struct ip_vs_protocol *pp,
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struct ip_vs_conn *cp, struct ip_vs_iphdr *iph));
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#endif
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#if defined(CONFIG_IP_VS_PROTO_TCP) && defined(CONFIG_IP_VS_PROTO_UDP)
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#define SNAT_CALL(f, ...) \
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INDIRECT_CALL_2(f, tcp_snat_handler, udp_snat_handler, __VA_ARGS__)
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#elif defined(CONFIG_IP_VS_PROTO_TCP)
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#define SNAT_CALL(f, ...) INDIRECT_CALL_1(f, tcp_snat_handler, __VA_ARGS__)
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#elif defined(CONFIG_IP_VS_PROTO_UDP)
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#define SNAT_CALL(f, ...) INDIRECT_CALL_1(f, udp_snat_handler, __VA_ARGS__)
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#else
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#define SNAT_CALL(f, ...) f(__VA_ARGS__)
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#endif
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static unsigned int ip_vs_net_id __read_mostly;
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/* netns cnt used for uniqueness */
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static atomic_t ipvs_netns_cnt = ATOMIC_INIT(0);
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/* ID used in ICMP lookups */
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#define icmp_id(icmph) (((icmph)->un).echo.id)
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#define icmpv6_id(icmph) (icmph->icmp6_dataun.u_echo.identifier)
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const char *ip_vs_proto_name(unsigned int proto)
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{
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static char buf[20];
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switch (proto) {
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case IPPROTO_IP:
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return "IP";
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case IPPROTO_UDP:
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return "UDP";
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case IPPROTO_TCP:
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return "TCP";
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case IPPROTO_SCTP:
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return "SCTP";
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case IPPROTO_ICMP:
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return "ICMP";
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#ifdef CONFIG_IP_VS_IPV6
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case IPPROTO_ICMPV6:
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return "ICMPv6";
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#endif
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default:
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sprintf(buf, "IP_%u", proto);
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return buf;
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}
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}
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void ip_vs_init_hash_table(struct list_head *table, int rows)
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{
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while (--rows >= 0)
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INIT_LIST_HEAD(&table[rows]);
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}
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static inline void
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ip_vs_in_stats(struct ip_vs_conn *cp, struct sk_buff *skb)
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{
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struct ip_vs_dest *dest = cp->dest;
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struct netns_ipvs *ipvs = cp->ipvs;
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if (dest && (dest->flags & IP_VS_DEST_F_AVAILABLE)) {
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struct ip_vs_cpu_stats *s;
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struct ip_vs_service *svc;
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local_bh_disable();
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s = this_cpu_ptr(dest->stats.cpustats);
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u64_stats_update_begin(&s->syncp);
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s->cnt.inpkts++;
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s->cnt.inbytes += skb->len;
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u64_stats_update_end(&s->syncp);
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svc = rcu_dereference(dest->svc);
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s = this_cpu_ptr(svc->stats.cpustats);
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u64_stats_update_begin(&s->syncp);
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s->cnt.inpkts++;
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s->cnt.inbytes += skb->len;
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u64_stats_update_end(&s->syncp);
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s = this_cpu_ptr(ipvs->tot_stats.cpustats);
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u64_stats_update_begin(&s->syncp);
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s->cnt.inpkts++;
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s->cnt.inbytes += skb->len;
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u64_stats_update_end(&s->syncp);
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local_bh_enable();
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}
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}
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static inline void
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ip_vs_out_stats(struct ip_vs_conn *cp, struct sk_buff *skb)
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{
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struct ip_vs_dest *dest = cp->dest;
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struct netns_ipvs *ipvs = cp->ipvs;
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if (dest && (dest->flags & IP_VS_DEST_F_AVAILABLE)) {
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struct ip_vs_cpu_stats *s;
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struct ip_vs_service *svc;
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local_bh_disable();
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s = this_cpu_ptr(dest->stats.cpustats);
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u64_stats_update_begin(&s->syncp);
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s->cnt.outpkts++;
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s->cnt.outbytes += skb->len;
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u64_stats_update_end(&s->syncp);
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svc = rcu_dereference(dest->svc);
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s = this_cpu_ptr(svc->stats.cpustats);
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u64_stats_update_begin(&s->syncp);
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s->cnt.outpkts++;
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s->cnt.outbytes += skb->len;
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u64_stats_update_end(&s->syncp);
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s = this_cpu_ptr(ipvs->tot_stats.cpustats);
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u64_stats_update_begin(&s->syncp);
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s->cnt.outpkts++;
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s->cnt.outbytes += skb->len;
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u64_stats_update_end(&s->syncp);
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local_bh_enable();
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}
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}
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static inline void
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ip_vs_conn_stats(struct ip_vs_conn *cp, struct ip_vs_service *svc)
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{
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struct netns_ipvs *ipvs = svc->ipvs;
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struct ip_vs_cpu_stats *s;
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local_bh_disable();
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s = this_cpu_ptr(cp->dest->stats.cpustats);
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u64_stats_update_begin(&s->syncp);
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s->cnt.conns++;
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u64_stats_update_end(&s->syncp);
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s = this_cpu_ptr(svc->stats.cpustats);
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u64_stats_update_begin(&s->syncp);
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s->cnt.conns++;
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u64_stats_update_end(&s->syncp);
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s = this_cpu_ptr(ipvs->tot_stats.cpustats);
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u64_stats_update_begin(&s->syncp);
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s->cnt.conns++;
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u64_stats_update_end(&s->syncp);
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local_bh_enable();
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}
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static inline void
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ip_vs_set_state(struct ip_vs_conn *cp, int direction,
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const struct sk_buff *skb,
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struct ip_vs_proto_data *pd)
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{
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if (likely(pd->pp->state_transition))
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pd->pp->state_transition(cp, direction, skb, pd);
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}
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static inline int
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ip_vs_conn_fill_param_persist(const struct ip_vs_service *svc,
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struct sk_buff *skb, int protocol,
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const union nf_inet_addr *caddr, __be16 cport,
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const union nf_inet_addr *vaddr, __be16 vport,
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struct ip_vs_conn_param *p)
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{
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ip_vs_conn_fill_param(svc->ipvs, svc->af, protocol, caddr, cport, vaddr,
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vport, p);
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p->pe = rcu_dereference(svc->pe);
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if (p->pe && p->pe->fill_param)
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return p->pe->fill_param(p, skb);
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return 0;
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}
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/*
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* IPVS persistent scheduling function
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* It creates a connection entry according to its template if exists,
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* or selects a server and creates a connection entry plus a template.
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* Locking: we are svc user (svc->refcnt), so we hold all dests too
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* Protocols supported: TCP, UDP
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*/
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static struct ip_vs_conn *
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ip_vs_sched_persist(struct ip_vs_service *svc,
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struct sk_buff *skb, __be16 src_port, __be16 dst_port,
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int *ignored, struct ip_vs_iphdr *iph)
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{
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struct ip_vs_conn *cp = NULL;
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struct ip_vs_dest *dest;
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struct ip_vs_conn *ct;
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__be16 dport = 0; /* destination port to forward */
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unsigned int flags;
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struct ip_vs_conn_param param;
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const union nf_inet_addr fwmark = { .ip = htonl(svc->fwmark) };
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union nf_inet_addr snet; /* source network of the client,
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after masking */
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const union nf_inet_addr *src_addr, *dst_addr;
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if (likely(!ip_vs_iph_inverse(iph))) {
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src_addr = &iph->saddr;
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dst_addr = &iph->daddr;
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} else {
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src_addr = &iph->daddr;
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dst_addr = &iph->saddr;
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}
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/* Mask saddr with the netmask to adjust template granularity */
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#ifdef CONFIG_IP_VS_IPV6
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if (svc->af == AF_INET6)
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ipv6_addr_prefix(&snet.in6, &src_addr->in6,
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(__force __u32) svc->netmask);
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else
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#endif
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snet.ip = src_addr->ip & svc->netmask;
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IP_VS_DBG_BUF(6, "p-schedule: src %s:%u dest %s:%u "
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"mnet %s\n",
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IP_VS_DBG_ADDR(svc->af, src_addr), ntohs(src_port),
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IP_VS_DBG_ADDR(svc->af, dst_addr), ntohs(dst_port),
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IP_VS_DBG_ADDR(svc->af, &snet));
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/*
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* As far as we know, FTP is a very complicated network protocol, and
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* it uses control connection and data connections. For active FTP,
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* FTP server initialize data connection to the client, its source port
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* is often 20. For passive FTP, FTP server tells the clients the port
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* that it passively listens to, and the client issues the data
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* connection. In the tunneling or direct routing mode, the load
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* balancer is on the client-to-server half of connection, the port
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* number is unknown to the load balancer. So, a conn template like
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* <caddr, 0, vaddr, 0, daddr, 0> is created for persistent FTP
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* service, and a template like <caddr, 0, vaddr, vport, daddr, dport>
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* is created for other persistent services.
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*/
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{
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int protocol = iph->protocol;
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const union nf_inet_addr *vaddr = dst_addr;
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__be16 vport = 0;
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if (dst_port == svc->port) {
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/* non-FTP template:
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* <protocol, caddr, 0, vaddr, vport, daddr, dport>
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* FTP template:
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* <protocol, caddr, 0, vaddr, 0, daddr, 0>
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*/
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if (svc->port != FTPPORT)
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vport = dst_port;
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} else {
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/* Note: persistent fwmark-based services and
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* persistent port zero service are handled here.
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* fwmark template:
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* <IPPROTO_IP,caddr,0,fwmark,0,daddr,0>
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* port zero template:
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* <protocol,caddr,0,vaddr,0,daddr,0>
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*/
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if (svc->fwmark) {
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protocol = IPPROTO_IP;
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vaddr = &fwmark;
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}
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}
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/* return *ignored = -1 so NF_DROP can be used */
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if (ip_vs_conn_fill_param_persist(svc, skb, protocol, &snet, 0,
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vaddr, vport, ¶m) < 0) {
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*ignored = -1;
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return NULL;
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}
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}
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/* Check if a template already exists */
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ct = ip_vs_ct_in_get(¶m);
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if (!ct || !ip_vs_check_template(ct, NULL)) {
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struct ip_vs_scheduler *sched;
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/*
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* No template found or the dest of the connection
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* template is not available.
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* return *ignored=0 i.e. ICMP and NF_DROP
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*/
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sched = rcu_dereference(svc->scheduler);
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if (sched) {
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/* read svc->sched_data after svc->scheduler */
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smp_rmb();
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dest = sched->schedule(svc, skb, iph);
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} else {
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dest = NULL;
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}
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if (!dest) {
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IP_VS_DBG(1, "p-schedule: no dest found.\n");
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kfree(param.pe_data);
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*ignored = 0;
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return NULL;
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}
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if (dst_port == svc->port && svc->port != FTPPORT)
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dport = dest->port;
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/* Create a template
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* This adds param.pe_data to the template,
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* and thus param.pe_data will be destroyed
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* when the template expires */
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ct = ip_vs_conn_new(¶m, dest->af, &dest->addr, dport,
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IP_VS_CONN_F_TEMPLATE, dest, skb->mark);
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if (ct == NULL) {
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kfree(param.pe_data);
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*ignored = -1;
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return NULL;
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}
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ct->timeout = svc->timeout;
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} else {
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/* set destination with the found template */
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dest = ct->dest;
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kfree(param.pe_data);
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}
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dport = dst_port;
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if (dport == svc->port && dest->port)
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dport = dest->port;
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flags = (svc->flags & IP_VS_SVC_F_ONEPACKET
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&& iph->protocol == IPPROTO_UDP) ?
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IP_VS_CONN_F_ONE_PACKET : 0;
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/*
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* Create a new connection according to the template
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*/
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ip_vs_conn_fill_param(svc->ipvs, svc->af, iph->protocol, src_addr,
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src_port, dst_addr, dst_port, ¶m);
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cp = ip_vs_conn_new(¶m, dest->af, &dest->addr, dport, flags, dest,
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skb->mark);
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if (cp == NULL) {
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ip_vs_conn_put(ct);
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*ignored = -1;
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return NULL;
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}
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/*
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* Add its control
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*/
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ip_vs_control_add(cp, ct);
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ip_vs_conn_put(ct);
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ip_vs_conn_stats(cp, svc);
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return cp;
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}
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/*
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* IPVS main scheduling function
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* It selects a server according to the virtual service, and
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* creates a connection entry.
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* Protocols supported: TCP, UDP
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*
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* Usage of *ignored
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*
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* 1 : protocol tried to schedule (eg. on SYN), found svc but the
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* svc/scheduler decides that this packet should be accepted with
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* NF_ACCEPT because it must not be scheduled.
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*
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* 0 : scheduler can not find destination, so try bypass or
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* return ICMP and then NF_DROP (ip_vs_leave).
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*
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* -1 : scheduler tried to schedule but fatal error occurred, eg.
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* ip_vs_conn_new failure (ENOMEM) or ip_vs_sip_fill_param
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* failure such as missing Call-ID, ENOMEM on skb_linearize
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* or pe_data. In this case we should return NF_DROP without
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* any attempts to send ICMP with ip_vs_leave.
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*/
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struct ip_vs_conn *
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ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb,
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struct ip_vs_proto_data *pd, int *ignored,
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struct ip_vs_iphdr *iph)
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{
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struct ip_vs_protocol *pp = pd->pp;
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struct ip_vs_conn *cp = NULL;
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struct ip_vs_scheduler *sched;
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struct ip_vs_dest *dest;
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__be16 _ports[2], *pptr, cport, vport;
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const void *caddr, *vaddr;
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unsigned int flags;
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*ignored = 1;
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/*
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* IPv6 frags, only the first hit here.
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*/
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pptr = frag_safe_skb_hp(skb, iph->len, sizeof(_ports), _ports);
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if (pptr == NULL)
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return NULL;
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if (likely(!ip_vs_iph_inverse(iph))) {
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cport = pptr[0];
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caddr = &iph->saddr;
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vport = pptr[1];
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vaddr = &iph->daddr;
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} else {
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cport = pptr[1];
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caddr = &iph->daddr;
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vport = pptr[0];
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vaddr = &iph->saddr;
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}
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/*
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* 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 (cport == FTPDATA) {
|
|
IP_VS_DBG_PKT(12, svc->af, pp, skb, iph->off,
|
|
"Not scheduling FTPDATA");
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Do not schedule replies from local real server.
|
|
*/
|
|
if ((!skb->dev || skb->dev->flags & IFF_LOOPBACK)) {
|
|
iph->hdr_flags ^= IP_VS_HDR_INVERSE;
|
|
cp = INDIRECT_CALL_1(pp->conn_in_get,
|
|
ip_vs_conn_in_get_proto, svc->ipvs,
|
|
svc->af, skb, iph);
|
|
iph->hdr_flags ^= IP_VS_HDR_INVERSE;
|
|
|
|
if (cp) {
|
|
IP_VS_DBG_PKT(12, svc->af, pp, skb, iph->off,
|
|
"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, cport, vport, ignored,
|
|
iph);
|
|
|
|
*ignored = 0;
|
|
|
|
/*
|
|
* Non-persistent service
|
|
*/
|
|
if (!svc->fwmark && vport != 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);
|
|
if (sched) {
|
|
/* read svc->sched_data after svc->scheduler */
|
|
smp_rmb();
|
|
dest = sched->schedule(svc, skb, iph);
|
|
} else {
|
|
dest = NULL;
|
|
}
|
|
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->ipvs, svc->af, iph->protocol,
|
|
caddr, cport, vaddr, vport, &p);
|
|
cp = ip_vs_conn_new(&p, dest->af, &dest->addr,
|
|
dest->port ? dest->port : vport,
|
|
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, refcount_read(&cp->refcnt));
|
|
|
|
ip_vs_conn_stats(cp, svc);
|
|
return cp;
|
|
}
|
|
|
|
static inline int ip_vs_addr_is_unicast(struct net *net, int af,
|
|
union nf_inet_addr *addr)
|
|
{
|
|
#ifdef CONFIG_IP_VS_IPV6
|
|
if (af == AF_INET6)
|
|
return ipv6_addr_type(&addr->in6) & IPV6_ADDR_UNICAST;
|
|
#endif
|
|
return (inet_addr_type(net, addr->ip) == RTN_UNICAST);
|
|
}
|
|
|
|
/*
|
|
* 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, dport;
|
|
struct netns_ipvs *ipvs = svc->ipvs;
|
|
struct net *net = ipvs->net;
|
|
|
|
pptr = frag_safe_skb_hp(skb, iph->len, sizeof(_ports), _ports);
|
|
if (!pptr)
|
|
return NF_DROP;
|
|
dport = likely(!ip_vs_iph_inverse(iph)) ? pptr[1] : pptr[0];
|
|
|
|
/* 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 */
|
|
if (sysctl_cache_bypass(ipvs) && svc->fwmark &&
|
|
!(iph->hdr_flags & (IP_VS_HDR_INVERSE | IP_VS_HDR_ICMP)) &&
|
|
ip_vs_addr_is_unicast(net, svc->af, &iph->daddr)) {
|
|
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->ipvs, 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 */
|
|
|
|
if ((cp->flags & IP_VS_CONN_F_ONE_PACKET) && cp->control)
|
|
atomic_inc(&cp->control->in_pkts);
|
|
else
|
|
atomic_inc(&cp->in_pkts);
|
|
ip_vs_conn_put(cp);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* 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 && dport != FTPPORT)
|
|
return NF_ACCEPT;
|
|
|
|
if (unlikely(ip_vs_iph_icmp(iph)))
|
|
return NF_DROP;
|
|
|
|
/*
|
|
* 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)
|
|
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 netns_ipvs *ipvs)
|
|
{
|
|
return ipvs->sysctl_snat_reroute;
|
|
}
|
|
|
|
static int sysctl_nat_icmp_send(struct netns_ipvs *ipvs)
|
|
{
|
|
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 netns_ipvs *ipvs) { return 0; }
|
|
static int sysctl_nat_icmp_send(struct netns_ipvs *ipvs) { 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 netns_ipvs *ipvs,
|
|
struct sk_buff *skb, u_int32_t user)
|
|
{
|
|
int err;
|
|
|
|
local_bh_disable();
|
|
err = ip_defrag(ipvs->net, skb, user);
|
|
local_bh_enable();
|
|
if (!err)
|
|
ip_send_check(ip_hdr(skb));
|
|
|
|
return err;
|
|
}
|
|
|
|
static int ip_vs_route_me_harder(struct netns_ipvs *ipvs, int af,
|
|
struct sk_buff *skb, unsigned int hooknum)
|
|
{
|
|
if (!sysctl_snat_reroute(ipvs))
|
|
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(ipvs->net, skb) != 0)
|
|
return 1;
|
|
} else
|
|
#endif
|
|
if (!(skb_rtable(skb)->rt_flags & RTCF_LOCAL) &&
|
|
ip_route_me_harder(ipvs->net, 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) != IP_VS_CONN_F_MASQ)
|
|
goto ignore_cp;
|
|
|
|
/* 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(cp->ipvs, 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);
|
|
|
|
ignore_cp:
|
|
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 netns_ipvs *ipvs, 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(ipvs, 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_iph_skb_icmp(AF_INET, skb, offset, true, &ciph);
|
|
|
|
/* The embedded headers contain source and dest in reverse order */
|
|
cp = INDIRECT_CALL_1(pp->conn_out_get, ip_vs_conn_out_get_proto,
|
|
ipvs, AF_INET, skb, &ciph);
|
|
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 netns_ipvs *ipvs, struct sk_buff *skb,
|
|
int *related, unsigned int hooknum,
|
|
struct ip_vs_iphdr *ipvsh)
|
|
{
|
|
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;
|
|
union nf_inet_addr snet;
|
|
unsigned int offset;
|
|
|
|
*related = 1;
|
|
ic = frag_safe_skb_hp(skb, ipvsh->len, sizeof(_icmph), &_icmph);
|
|
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);
|
|
|
|
if (!ip_vs_fill_iph_skb_icmp(AF_INET6, skb, ipvsh->len + sizeof(_icmph),
|
|
true, &ciph))
|
|
return NF_ACCEPT; /* The packet 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 = INDIRECT_CALL_1(pp->conn_out_get, ip_vs_conn_out_get_proto,
|
|
ipvs, AF_INET6, skb, &ciph);
|
|
if (!cp)
|
|
return NF_ACCEPT;
|
|
|
|
snet.in6 = ciph.saddr.in6;
|
|
offset = ciph.len;
|
|
return handle_response_icmp(AF_INET6, skb, &snet, ciph.protocol, cp,
|
|
pp, offset, 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)
|
|
{
|
|
struct sctp_chunkhdr *sch, schunk;
|
|
sch = skb_header_pointer(skb, nh_len + sizeof(struct sctphdr),
|
|
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: {
|
|
struct sctp_chunkhdr *sch, schunk;
|
|
|
|
sch = skb_header_pointer(skb, iph->len + sizeof(struct sctphdr),
|
|
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) ||
|
|
(cp->state == IP_VS_TCP_S_CLOSE) ||
|
|
((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;
|
|
}
|
|
}
|
|
|
|
/* Generic function to create new connections for outgoing RS packets
|
|
*
|
|
* Pre-requisites for successful connection creation:
|
|
* 1) Virtual Service is NOT fwmark based:
|
|
* In fwmark-VS actual vaddr and vport are unknown to IPVS
|
|
* 2) Real Server and Virtual Service were NOT configured without port:
|
|
* This is to allow match of different VS to the same RS ip-addr
|
|
*/
|
|
struct ip_vs_conn *ip_vs_new_conn_out(struct ip_vs_service *svc,
|
|
struct ip_vs_dest *dest,
|
|
struct sk_buff *skb,
|
|
const struct ip_vs_iphdr *iph,
|
|
__be16 dport,
|
|
__be16 cport)
|
|
{
|
|
struct ip_vs_conn_param param;
|
|
struct ip_vs_conn *ct = NULL, *cp = NULL;
|
|
const union nf_inet_addr *vaddr, *daddr, *caddr;
|
|
union nf_inet_addr snet;
|
|
__be16 vport;
|
|
unsigned int flags;
|
|
|
|
EnterFunction(12);
|
|
vaddr = &svc->addr;
|
|
vport = svc->port;
|
|
daddr = &iph->saddr;
|
|
caddr = &iph->daddr;
|
|
|
|
/* check pre-requisites are satisfied */
|
|
if (svc->fwmark)
|
|
return NULL;
|
|
if (!vport || !dport)
|
|
return NULL;
|
|
|
|
/* for persistent service first create connection template */
|
|
if (svc->flags & IP_VS_SVC_F_PERSISTENT) {
|
|
/* apply netmask the same way ingress-side does */
|
|
#ifdef CONFIG_IP_VS_IPV6
|
|
if (svc->af == AF_INET6)
|
|
ipv6_addr_prefix(&snet.in6, &caddr->in6,
|
|
(__force __u32)svc->netmask);
|
|
else
|
|
#endif
|
|
snet.ip = caddr->ip & svc->netmask;
|
|
/* fill params and create template if not existent */
|
|
if (ip_vs_conn_fill_param_persist(svc, skb, iph->protocol,
|
|
&snet, 0, vaddr,
|
|
vport, ¶m) < 0)
|
|
return NULL;
|
|
ct = ip_vs_ct_in_get(¶m);
|
|
/* check if template exists and points to the same dest */
|
|
if (!ct || !ip_vs_check_template(ct, dest)) {
|
|
ct = ip_vs_conn_new(¶m, dest->af, daddr, dport,
|
|
IP_VS_CONN_F_TEMPLATE, dest, 0);
|
|
if (!ct) {
|
|
kfree(param.pe_data);
|
|
return NULL;
|
|
}
|
|
ct->timeout = svc->timeout;
|
|
} else {
|
|
kfree(param.pe_data);
|
|
}
|
|
}
|
|
|
|
/* connection flags */
|
|
flags = ((svc->flags & IP_VS_SVC_F_ONEPACKET) &&
|
|
iph->protocol == IPPROTO_UDP) ? IP_VS_CONN_F_ONE_PACKET : 0;
|
|
/* create connection */
|
|
ip_vs_conn_fill_param(svc->ipvs, svc->af, iph->protocol,
|
|
caddr, cport, vaddr, vport, ¶m);
|
|
cp = ip_vs_conn_new(¶m, dest->af, daddr, dport, flags, dest, 0);
|
|
if (!cp) {
|
|
if (ct)
|
|
ip_vs_conn_put(ct);
|
|
return NULL;
|
|
}
|
|
if (ct) {
|
|
ip_vs_control_add(cp, ct);
|
|
ip_vs_conn_put(ct);
|
|
}
|
|
ip_vs_conn_stats(cp, svc);
|
|
|
|
/* return connection (will be used to handle outgoing packet) */
|
|
IP_VS_DBG_BUF(6, "New connection RS-initiated:%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->af, &cp->daddr), ntohs(cp->dport),
|
|
cp->flags, refcount_read(&cp->refcnt));
|
|
LeaveFunction(12);
|
|
return cp;
|
|
}
|
|
|
|
/* Handle outgoing packets which are considered requests initiated by
|
|
* real servers, so that subsequent responses from external client can be
|
|
* routed to the right real server.
|
|
* Used also for outgoing responses in OPS mode.
|
|
*
|
|
* Connection management is handled by persistent-engine specific callback.
|
|
*/
|
|
static struct ip_vs_conn *__ip_vs_rs_conn_out(unsigned int hooknum,
|
|
struct netns_ipvs *ipvs,
|
|
int af, struct sk_buff *skb,
|
|
const struct ip_vs_iphdr *iph)
|
|
{
|
|
struct ip_vs_dest *dest;
|
|
struct ip_vs_conn *cp = NULL;
|
|
__be16 _ports[2], *pptr;
|
|
|
|
if (hooknum == NF_INET_LOCAL_IN)
|
|
return NULL;
|
|
|
|
pptr = frag_safe_skb_hp(skb, iph->len,
|
|
sizeof(_ports), _ports);
|
|
if (!pptr)
|
|
return NULL;
|
|
|
|
dest = ip_vs_find_real_service(ipvs, af, iph->protocol,
|
|
&iph->saddr, pptr[0]);
|
|
if (dest) {
|
|
struct ip_vs_service *svc;
|
|
struct ip_vs_pe *pe;
|
|
|
|
svc = rcu_dereference(dest->svc);
|
|
if (svc) {
|
|
pe = rcu_dereference(svc->pe);
|
|
if (pe && pe->conn_out)
|
|
cp = pe->conn_out(svc, dest, skb, iph,
|
|
pptr[0], pptr[1]);
|
|
}
|
|
}
|
|
|
|
return cp;
|
|
}
|
|
|
|
/* 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, iph->off, "Outgoing packet");
|
|
|
|
if (!skb_make_writable(skb, iph->len))
|
|
goto drop;
|
|
|
|
/* mangle the packet */
|
|
if (pp->snat_handler &&
|
|
!SNAT_CALL(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(cp->ipvs, af, skb, hooknum))
|
|
goto drop;
|
|
|
|
IP_VS_DBG_PKT(10, af, pp, skb, iph->off, "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(struct netns_ipvs *ipvs, unsigned int hooknum, struct sk_buff *skb, int af)
|
|
{
|
|
struct ip_vs_iphdr iph;
|
|
struct ip_vs_protocol *pp;
|
|
struct ip_vs_proto_data *pd;
|
|
struct ip_vs_conn *cp;
|
|
struct sock *sk;
|
|
|
|
EnterFunction(11);
|
|
|
|
/* Already marked as IPVS request or reply? */
|
|
if (skb->ipvs_property)
|
|
return NF_ACCEPT;
|
|
|
|
sk = skb_to_full_sk(skb);
|
|
/* Bad... Do not break raw sockets */
|
|
if (unlikely(sk && hooknum == NF_INET_LOCAL_OUT &&
|
|
af == AF_INET)) {
|
|
|
|
if (sk->sk_family == PF_INET && inet_sk(sk)->nodefrag)
|
|
return NF_ACCEPT;
|
|
}
|
|
|
|
if (unlikely(!skb_dst(skb)))
|
|
return NF_ACCEPT;
|
|
|
|
if (!ipvs->enable)
|
|
return NF_ACCEPT;
|
|
|
|
ip_vs_fill_iph_skb(af, skb, false, &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(ipvs, skb, &related,
|
|
hooknum, &iph);
|
|
|
|
if (related)
|
|
return verdict;
|
|
}
|
|
} else
|
|
#endif
|
|
if (unlikely(iph.protocol == IPPROTO_ICMP)) {
|
|
int related;
|
|
int verdict = ip_vs_out_icmp(ipvs, skb, &related, hooknum);
|
|
|
|
if (related)
|
|
return verdict;
|
|
}
|
|
|
|
pd = ip_vs_proto_data_get(ipvs, 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(ipvs, skb,
|
|
ip_vs_defrag_user(hooknum)))
|
|
return NF_STOLEN;
|
|
|
|
ip_vs_fill_iph_skb(AF_INET, skb, false, &iph);
|
|
}
|
|
|
|
/*
|
|
* Check if the packet belongs to an existing entry
|
|
*/
|
|
cp = INDIRECT_CALL_1(pp->conn_out_get, ip_vs_conn_out_get_proto,
|
|
ipvs, af, skb, &iph);
|
|
|
|
if (likely(cp)) {
|
|
if (IP_VS_FWD_METHOD(cp) != IP_VS_CONN_F_MASQ)
|
|
goto ignore_cp;
|
|
return handle_response(af, skb, pd, cp, &iph, hooknum);
|
|
}
|
|
|
|
/* Check for real-server-started requests */
|
|
if (atomic_read(&ipvs->conn_out_counter)) {
|
|
/* Currently only for UDP:
|
|
* connection oriented protocols typically use
|
|
* ephemeral ports for outgoing connections, so
|
|
* related incoming responses would not match any VS
|
|
*/
|
|
if (pp->protocol == IPPROTO_UDP) {
|
|
cp = __ip_vs_rs_conn_out(hooknum, ipvs, af, skb, &iph);
|
|
if (likely(cp))
|
|
return handle_response(af, skb, pd, cp, &iph,
|
|
hooknum);
|
|
}
|
|
}
|
|
|
|
if (sysctl_nat_icmp_send(ipvs) &&
|
|
(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);
|
|
if (pptr == NULL)
|
|
return NF_ACCEPT; /* Not for me */
|
|
if (ip_vs_has_real_service(ipvs, 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 = ipvs->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;
|
|
}
|
|
}
|
|
}
|
|
|
|
out:
|
|
IP_VS_DBG_PKT(12, af, pp, skb, iph.off,
|
|
"ip_vs_out: packet continues traversal as normal");
|
|
return NF_ACCEPT;
|
|
|
|
ignore_cp:
|
|
__ip_vs_conn_put(cp);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* 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(void *priv, struct sk_buff *skb,
|
|
const struct nf_hook_state *state)
|
|
{
|
|
return ip_vs_out(net_ipvs(state->net), state->hook, 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(void *priv, struct sk_buff *skb,
|
|
const struct nf_hook_state *state)
|
|
{
|
|
return ip_vs_out(net_ipvs(state->net), state->hook, 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(void *priv, struct sk_buff *skb,
|
|
const struct nf_hook_state *state)
|
|
{
|
|
return ip_vs_out(net_ipvs(state->net), state->hook, 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(void *priv, struct sk_buff *skb,
|
|
const struct nf_hook_state *state)
|
|
{
|
|
return ip_vs_out(net_ipvs(state->net), state->hook, skb, AF_INET6);
|
|
}
|
|
|
|
#endif
|
|
|
|
static unsigned int
|
|
ip_vs_try_to_schedule(struct netns_ipvs *ipvs, int af, struct sk_buff *skb,
|
|
struct ip_vs_proto_data *pd,
|
|
int *verdict, struct ip_vs_conn **cpp,
|
|
struct ip_vs_iphdr *iph)
|
|
{
|
|
struct ip_vs_protocol *pp = pd->pp;
|
|
|
|
if (!iph->fragoffs) {
|
|
/* No (second) fragments need to enter here, as nf_defrag_ipv6
|
|
* replayed fragment zero will already have created the cp
|
|
*/
|
|
|
|
/* Schedule and create new connection entry into cpp */
|
|
if (!pp->conn_schedule(ipvs, af, skb, pd, verdict, cpp, iph))
|
|
return 0;
|
|
}
|
|
|
|
if (unlikely(!*cpp)) {
|
|
/* sorry, all this trouble for a no-hit :) */
|
|
IP_VS_DBG_PKT(12, af, pp, skb, iph->off,
|
|
"ip_vs_in: packet continues traversal as normal");
|
|
|
|
/* Fragment couldn't be mapped to a conn entry */
|
|
if (iph->fragoffs)
|
|
IP_VS_DBG_PKT(7, af, pp, skb, iph->off,
|
|
"unhandled fragment");
|
|
|
|
*verdict = NF_ACCEPT;
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* 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 netns_ipvs *ipvs, 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;
|
|
struct ip_vs_proto_data *pd;
|
|
unsigned int offset, offset2, ihl, verdict;
|
|
bool ipip, new_cp = false;
|
|
|
|
*related = 1;
|
|
|
|
/* reassemble IP fragments */
|
|
if (ip_is_fragment(ip_hdr(skb))) {
|
|
if (ip_vs_gather_frags(ipvs, 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 */
|
|
|
|
/* 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(ipvs, 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_iph_skb_icmp(AF_INET, skb, offset, !ipip, &ciph);
|
|
offset = ciph.len;
|
|
|
|
/* The embedded headers contain source and dest in reverse order.
|
|
* For IPIP this is error for request, not for reply.
|
|
*/
|
|
cp = INDIRECT_CALL_1(pp->conn_in_get, ip_vs_conn_in_get_proto,
|
|
ipvs, AF_INET, skb, &ciph);
|
|
|
|
if (!cp) {
|
|
int v;
|
|
|
|
if (ipip || !sysctl_schedule_icmp(ipvs))
|
|
return NF_ACCEPT;
|
|
|
|
if (!ip_vs_try_to_schedule(ipvs, AF_INET, skb, pd, &v, &cp, &ciph))
|
|
return v;
|
|
new_cp = true;
|
|
}
|
|
|
|
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, ipvs->net, mtu, 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;
|
|
|
|
dest_dst = rcu_dereference(dest->dest_dst);
|
|
if (dest_dst)
|
|
mtu = dst_mtu(dest_dst->dst_cache);
|
|
}
|
|
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:
|
|
if (likely(!new_cp))
|
|
__ip_vs_conn_put(cp);
|
|
else
|
|
ip_vs_conn_put(cp);
|
|
|
|
return verdict;
|
|
}
|
|
|
|
#ifdef CONFIG_IP_VS_IPV6
|
|
static int ip_vs_in_icmp_v6(struct netns_ipvs *ipvs, struct sk_buff *skb,
|
|
int *related, unsigned int hooknum,
|
|
struct ip_vs_iphdr *iph)
|
|
{
|
|
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 offset, verdict;
|
|
bool new_cp = false;
|
|
|
|
*related = 1;
|
|
|
|
ic = frag_safe_skb_hp(skb, iph->len, sizeof(_icmph), &_icmph);
|
|
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);
|
|
|
|
offset = iph->len + sizeof(_icmph);
|
|
if (!ip_vs_fill_iph_skb_icmp(AF_INET6, skb, offset, true, &ciph))
|
|
return NF_ACCEPT;
|
|
|
|
pd = ip_vs_proto_data_get(ipvs, 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, offset,
|
|
"Checking incoming ICMPv6 for");
|
|
|
|
/* The embedded headers contain source and dest in reverse order
|
|
* if not from localhost
|
|
*/
|
|
cp = INDIRECT_CALL_1(pp->conn_in_get, ip_vs_conn_in_get_proto,
|
|
ipvs, AF_INET6, skb, &ciph);
|
|
|
|
if (!cp) {
|
|
int v;
|
|
|
|
if (!sysctl_schedule_icmp(ipvs))
|
|
return NF_ACCEPT;
|
|
|
|
if (!ip_vs_try_to_schedule(ipvs, AF_INET6, skb, pd, &v, &cp, &ciph))
|
|
return v;
|
|
|
|
new_cp = true;
|
|
}
|
|
|
|
/* 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)) {
|
|
verdict = NF_ACCEPT;
|
|
goto out;
|
|
}
|
|
|
|
/* do the statistics and put it back */
|
|
ip_vs_in_stats(cp, skb);
|
|
|
|
/* Need to mangle contained IPv6 header in ICMPv6 packet */
|
|
offset = ciph.len;
|
|
if (IPPROTO_TCP == ciph.protocol || IPPROTO_UDP == ciph.protocol ||
|
|
IPPROTO_SCTP == ciph.protocol)
|
|
offset += 2 * sizeof(__u16); /* Also mangle ports */
|
|
|
|
verdict = ip_vs_icmp_xmit_v6(skb, cp, pp, offset, hooknum, &ciph);
|
|
|
|
out:
|
|
if (likely(!new_cp))
|
|
__ip_vs_conn_put(cp);
|
|
else
|
|
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(struct netns_ipvs *ipvs, unsigned int hooknum, struct sk_buff *skb, int af)
|
|
{
|
|
struct ip_vs_iphdr iph;
|
|
struct ip_vs_protocol *pp;
|
|
struct ip_vs_proto_data *pd;
|
|
struct ip_vs_conn *cp;
|
|
int ret, pkts;
|
|
int conn_reuse_mode;
|
|
struct sock *sk;
|
|
|
|
/* 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, false, &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 ? */
|
|
if (unlikely(sysctl_backup_only(ipvs) || !ipvs->enable))
|
|
return NF_ACCEPT;
|
|
|
|
ip_vs_fill_iph_skb(af, skb, false, &iph);
|
|
|
|
/* Bad... Do not break raw sockets */
|
|
sk = skb_to_full_sk(skb);
|
|
if (unlikely(sk && hooknum == NF_INET_LOCAL_OUT &&
|
|
af == AF_INET)) {
|
|
|
|
if (sk->sk_family == PF_INET && inet_sk(sk)->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(ipvs, skb, &related,
|
|
hooknum, &iph);
|
|
|
|
if (related)
|
|
return verdict;
|
|
}
|
|
} else
|
|
#endif
|
|
if (unlikely(iph.protocol == IPPROTO_ICMP)) {
|
|
int related;
|
|
int verdict = ip_vs_in_icmp(ipvs, skb, &related,
|
|
hooknum);
|
|
|
|
if (related)
|
|
return verdict;
|
|
}
|
|
|
|
/* Protocol supported? */
|
|
pd = ip_vs_proto_data_get(ipvs, iph.protocol);
|
|
if (unlikely(!pd)) {
|
|
/* The only way we'll see this packet again is if it's
|
|
* encapsulated, so mark it with ipvs_property=1 so we
|
|
* skip it if we're ignoring tunneled packets
|
|
*/
|
|
if (sysctl_ignore_tunneled(ipvs))
|
|
skb->ipvs_property = 1;
|
|
|
|
return NF_ACCEPT;
|
|
}
|
|
pp = pd->pp;
|
|
/*
|
|
* Check if the packet belongs to an existing connection entry
|
|
*/
|
|
cp = INDIRECT_CALL_1(pp->conn_in_get, ip_vs_conn_in_get_proto,
|
|
ipvs, af, skb, &iph);
|
|
|
|
conn_reuse_mode = sysctl_conn_reuse_mode(ipvs);
|
|
if (conn_reuse_mode && !iph.fragoffs && is_new_conn(skb, &iph) && cp) {
|
|
bool uses_ct = false, resched = false;
|
|
|
|
if (unlikely(sysctl_expire_nodest_conn(ipvs)) && cp->dest &&
|
|
unlikely(!atomic_read(&cp->dest->weight))) {
|
|
resched = true;
|
|
uses_ct = ip_vs_conn_uses_conntrack(cp, skb);
|
|
} else if (is_new_conn_expected(cp, conn_reuse_mode)) {
|
|
uses_ct = ip_vs_conn_uses_conntrack(cp, skb);
|
|
if (!atomic_read(&cp->n_control)) {
|
|
resched = true;
|
|
} else {
|
|
/* Do not reschedule controlling connection
|
|
* that uses conntrack while it is still
|
|
* referenced by controlled connection(s).
|
|
*/
|
|
resched = !uses_ct;
|
|
}
|
|
}
|
|
|
|
if (resched) {
|
|
if (!atomic_read(&cp->n_control))
|
|
ip_vs_conn_expire_now(cp);
|
|
__ip_vs_conn_put(cp);
|
|
if (uses_ct)
|
|
return NF_DROP;
|
|
cp = NULL;
|
|
}
|
|
}
|
|
|
|
if (unlikely(!cp)) {
|
|
int v;
|
|
|
|
if (!ip_vs_try_to_schedule(ipvs, af, skb, pd, &v, &cp, &iph))
|
|
return v;
|
|
}
|
|
|
|
IP_VS_DBG_PKT(11, af, pp, skb, iph.off, "Incoming packet");
|
|
|
|
/* Check the server status */
|
|
if (cp->dest && !(cp->dest->flags & IP_VS_DEST_F_AVAILABLE)) {
|
|
/* the destination server is not available */
|
|
|
|
__u32 flags = cp->flags;
|
|
|
|
/* when timer already started, silently drop the packet.*/
|
|
if (timer_pending(&cp->timer))
|
|
__ip_vs_conn_put(cp);
|
|
else
|
|
ip_vs_conn_put(cp);
|
|
|
|
if (sysctl_expire_nodest_conn(ipvs) &&
|
|
!(flags & IP_VS_CONN_F_ONE_PACKET)) {
|
|
/* try to expire the connection immediately */
|
|
ip_vs_conn_expire_now(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(ipvs, cp, pkts);
|
|
else if ((cp->flags & IP_VS_CONN_F_ONE_PACKET) && cp->control)
|
|
/* increment is done inside ip_vs_sync_conn too */
|
|
atomic_inc(&cp->control->in_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(void *priv, struct sk_buff *skb,
|
|
const struct nf_hook_state *state)
|
|
{
|
|
return ip_vs_in(net_ipvs(state->net), state->hook, 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(void *priv, struct sk_buff *skb,
|
|
const struct nf_hook_state *state)
|
|
{
|
|
return ip_vs_in(net_ipvs(state->net), state->hook, 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(void *priv, struct sk_buff *skb,
|
|
const struct nf_hook_state *state)
|
|
{
|
|
return ip_vs_in(net_ipvs(state->net), state->hook, 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(void *priv, struct sk_buff *skb,
|
|
const struct nf_hook_state *state)
|
|
{
|
|
return ip_vs_in(net_ipvs(state->net), state->hook, 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(void *priv, struct sk_buff *skb,
|
|
const struct nf_hook_state *state)
|
|
{
|
|
int r;
|
|
struct netns_ipvs *ipvs = net_ipvs(state->net);
|
|
|
|
if (ip_hdr(skb)->protocol != IPPROTO_ICMP)
|
|
return NF_ACCEPT;
|
|
|
|
/* ipvs enabled in this netns ? */
|
|
if (unlikely(sysctl_backup_only(ipvs) || !ipvs->enable))
|
|
return NF_ACCEPT;
|
|
|
|
return ip_vs_in_icmp(ipvs, skb, &r, state->hook);
|
|
}
|
|
|
|
#ifdef CONFIG_IP_VS_IPV6
|
|
static unsigned int
|
|
ip_vs_forward_icmp_v6(void *priv, struct sk_buff *skb,
|
|
const struct nf_hook_state *state)
|
|
{
|
|
int r;
|
|
struct netns_ipvs *ipvs = net_ipvs(state->net);
|
|
struct ip_vs_iphdr iphdr;
|
|
|
|
ip_vs_fill_iph_skb(AF_INET6, skb, false, &iphdr);
|
|
if (iphdr.protocol != IPPROTO_ICMPV6)
|
|
return NF_ACCEPT;
|
|
|
|
/* ipvs enabled in this netns ? */
|
|
if (unlikely(sysctl_backup_only(ipvs) || !ipvs->enable))
|
|
return NF_ACCEPT;
|
|
|
|
return ip_vs_in_icmp_v6(ipvs, skb, &r, state->hook, &iphdr);
|
|
}
|
|
#endif
|
|
|
|
|
|
static const struct nf_hook_ops ip_vs_ops[] = {
|
|
/* After packet filtering, change source only for VS/NAT */
|
|
{
|
|
.hook = ip_vs_reply4,
|
|
.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,
|
|
.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,
|
|
.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,
|
|
.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,
|
|
.pf = NFPROTO_IPV4,
|
|
.hooknum = NF_INET_FORWARD,
|
|
.priority = 99,
|
|
},
|
|
/* After packet filtering, change source only for VS/NAT */
|
|
{
|
|
.hook = ip_vs_reply4,
|
|
.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,
|
|
.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,
|
|
.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,
|
|
.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,
|
|
.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,
|
|
.pf = NFPROTO_IPV6,
|
|
.hooknum = NF_INET_FORWARD,
|
|
.priority = 99,
|
|
},
|
|
/* After packet filtering, change source only for VS/NAT */
|
|
{
|
|
.hook = ip_vs_reply6,
|
|
.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;
|
|
int ret;
|
|
|
|
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(ipvs) < 0)
|
|
goto estimator_fail;
|
|
|
|
if (ip_vs_control_net_init(ipvs) < 0)
|
|
goto control_fail;
|
|
|
|
if (ip_vs_protocol_net_init(ipvs) < 0)
|
|
goto protocol_fail;
|
|
|
|
if (ip_vs_app_net_init(ipvs) < 0)
|
|
goto app_fail;
|
|
|
|
if (ip_vs_conn_net_init(ipvs) < 0)
|
|
goto conn_fail;
|
|
|
|
if (ip_vs_sync_net_init(ipvs) < 0)
|
|
goto sync_fail;
|
|
|
|
ret = nf_register_net_hooks(net, ip_vs_ops, ARRAY_SIZE(ip_vs_ops));
|
|
if (ret < 0)
|
|
goto hook_fail;
|
|
|
|
return 0;
|
|
/*
|
|
* Error handling
|
|
*/
|
|
|
|
hook_fail:
|
|
ip_vs_sync_net_cleanup(ipvs);
|
|
sync_fail:
|
|
ip_vs_conn_net_cleanup(ipvs);
|
|
conn_fail:
|
|
ip_vs_app_net_cleanup(ipvs);
|
|
app_fail:
|
|
ip_vs_protocol_net_cleanup(ipvs);
|
|
protocol_fail:
|
|
ip_vs_control_net_cleanup(ipvs);
|
|
control_fail:
|
|
ip_vs_estimator_net_cleanup(ipvs);
|
|
estimator_fail:
|
|
net->ipvs = NULL;
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static void __net_exit __ip_vs_cleanup(struct net *net)
|
|
{
|
|
struct netns_ipvs *ipvs = net_ipvs(net);
|
|
|
|
ip_vs_service_net_cleanup(ipvs); /* ip_vs_flush() with locks */
|
|
ip_vs_conn_net_cleanup(ipvs);
|
|
ip_vs_app_net_cleanup(ipvs);
|
|
ip_vs_protocol_net_cleanup(ipvs);
|
|
ip_vs_control_net_cleanup(ipvs);
|
|
ip_vs_estimator_net_cleanup(ipvs);
|
|
IP_VS_DBG(2, "ipvs netns %d released\n", ipvs->gen);
|
|
net->ipvs = NULL;
|
|
}
|
|
|
|
static void __net_exit __ip_vs_dev_cleanup(struct net *net)
|
|
{
|
|
struct netns_ipvs *ipvs = net_ipvs(net);
|
|
EnterFunction(2);
|
|
nf_unregister_net_hooks(net, ip_vs_ops, ARRAY_SIZE(ip_vs_ops));
|
|
ipvs->enable = 0; /* Disable packet reception */
|
|
smp_wmb();
|
|
ip_vs_sync_net_cleanup(ipvs);
|
|
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 = ip_vs_register_nl_ioctl();
|
|
if (ret < 0) {
|
|
pr_err("can't register netlink/ioctl.\n");
|
|
goto cleanup_dev;
|
|
}
|
|
|
|
pr_info("ipvs loaded.\n");
|
|
|
|
return ret;
|
|
|
|
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();
|
|
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");
|