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-rw-r--r--net/ipv4/ipvs/ip_vs_ctl.c2391
1 files changed, 2391 insertions, 0 deletions
diff --git a/net/ipv4/ipvs/ip_vs_ctl.c b/net/ipv4/ipvs/ip_vs_ctl.c
new file mode 100644
index 00000000000..218d9701036
--- /dev/null
+++ b/net/ipv4/ipvs/ip_vs_ctl.c
@@ -0,0 +1,2391 @@
+/*
+ * 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.
+ *
+ * Version: $Id: ip_vs_ctl.c,v 1.36 2003/06/08 09:31:19 wensong Exp $
+ *
+ * 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.
+ *
+ * Changes:
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/fs.h>
+#include <linux/sysctl.h>
+#include <linux/proc_fs.h>
+#include <linux/workqueue.h>
+#include <linux/swap.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+
+#include <linux/netfilter.h>
+#include <linux/netfilter_ipv4.h>
+
+#include <net/ip.h>
+#include <net/sock.h>
+
+#include <asm/uaccess.h>
+
+#include <net/ip_vs.h>
+
+/* semaphore for IPVS sockopts. And, [gs]etsockopt may sleep. */
+static DECLARE_MUTEX(__ip_vs_mutex);
+
+/* lock for service table */
+static DEFINE_RWLOCK(__ip_vs_svc_lock);
+
+/* lock for table with the real services */
+static DEFINE_RWLOCK(__ip_vs_rs_lock);
+
+/* lock for state and timeout tables */
+static DEFINE_RWLOCK(__ip_vs_securetcp_lock);
+
+/* lock for drop entry handling */
+static DEFINE_SPINLOCK(__ip_vs_dropentry_lock);
+
+/* lock for drop packet handling */
+static DEFINE_SPINLOCK(__ip_vs_droppacket_lock);
+
+/* 1/rate drop and drop-entry variables */
+int ip_vs_drop_rate = 0;
+int ip_vs_drop_counter = 0;
+static atomic_t ip_vs_dropentry = ATOMIC_INIT(0);
+
+/* number of virtual services */
+static int ip_vs_num_services = 0;
+
+/* sysctl variables */
+static int sysctl_ip_vs_drop_entry = 0;
+static int sysctl_ip_vs_drop_packet = 0;
+static int sysctl_ip_vs_secure_tcp = 0;
+static int sysctl_ip_vs_amemthresh = 1024;
+static int sysctl_ip_vs_am_droprate = 10;
+int sysctl_ip_vs_cache_bypass = 0;
+int sysctl_ip_vs_expire_nodest_conn = 0;
+int sysctl_ip_vs_expire_quiescent_template = 0;
+int sysctl_ip_vs_sync_threshold[2] = { 3, 50 };
+int sysctl_ip_vs_nat_icmp_send = 0;
+
+
+#ifdef CONFIG_IP_VS_DEBUG
+static int sysctl_ip_vs_debug_level = 0;
+
+int ip_vs_get_debug_level(void)
+{
+ return sysctl_ip_vs_debug_level;
+}
+#endif
+
+/*
+ * update_defense_level is called from keventd and from sysctl.
+ */
+static void update_defense_level(void)
+{
+ struct sysinfo i;
+ static int old_secure_tcp = 0;
+ int availmem;
+ int nomem;
+ int to_change = -1;
+
+ /* we only count free and buffered memory (in pages) */
+ si_meminfo(&i);
+ availmem = i.freeram + i.bufferram;
+ /* however in linux 2.5 the i.bufferram is total page cache size,
+ we need adjust it */
+ /* si_swapinfo(&i); */
+ /* availmem = availmem - (i.totalswap - i.freeswap); */
+
+ nomem = (availmem < sysctl_ip_vs_amemthresh);
+
+ /* drop_entry */
+ spin_lock(&__ip_vs_dropentry_lock);
+ switch (sysctl_ip_vs_drop_entry) {
+ case 0:
+ atomic_set(&ip_vs_dropentry, 0);
+ break;
+ case 1:
+ if (nomem) {
+ atomic_set(&ip_vs_dropentry, 1);
+ sysctl_ip_vs_drop_entry = 2;
+ } else {
+ atomic_set(&ip_vs_dropentry, 0);
+ }
+ break;
+ case 2:
+ if (nomem) {
+ atomic_set(&ip_vs_dropentry, 1);
+ } else {
+ atomic_set(&ip_vs_dropentry, 0);
+ sysctl_ip_vs_drop_entry = 1;
+ };
+ break;
+ case 3:
+ atomic_set(&ip_vs_dropentry, 1);
+ break;
+ }
+ spin_unlock(&__ip_vs_dropentry_lock);
+
+ /* drop_packet */
+ spin_lock(&__ip_vs_droppacket_lock);
+ switch (sysctl_ip_vs_drop_packet) {
+ case 0:
+ ip_vs_drop_rate = 0;
+ break;
+ case 1:
+ if (nomem) {
+ ip_vs_drop_rate = ip_vs_drop_counter
+ = sysctl_ip_vs_amemthresh /
+ (sysctl_ip_vs_amemthresh-availmem);
+ sysctl_ip_vs_drop_packet = 2;
+ } else {
+ ip_vs_drop_rate = 0;
+ }
+ break;
+ case 2:
+ if (nomem) {
+ ip_vs_drop_rate = ip_vs_drop_counter
+ = sysctl_ip_vs_amemthresh /
+ (sysctl_ip_vs_amemthresh-availmem);
+ } else {
+ ip_vs_drop_rate = 0;
+ sysctl_ip_vs_drop_packet = 1;
+ }
+ break;
+ case 3:
+ ip_vs_drop_rate = sysctl_ip_vs_am_droprate;
+ break;
+ }
+ spin_unlock(&__ip_vs_droppacket_lock);
+
+ /* secure_tcp */
+ write_lock(&__ip_vs_securetcp_lock);
+ switch (sysctl_ip_vs_secure_tcp) {
+ case 0:
+ if (old_secure_tcp >= 2)
+ to_change = 0;
+ break;
+ case 1:
+ if (nomem) {
+ if (old_secure_tcp < 2)
+ to_change = 1;
+ sysctl_ip_vs_secure_tcp = 2;
+ } else {
+ if (old_secure_tcp >= 2)
+ to_change = 0;
+ }
+ break;
+ case 2:
+ if (nomem) {
+ if (old_secure_tcp < 2)
+ to_change = 1;
+ } else {
+ if (old_secure_tcp >= 2)
+ to_change = 0;
+ sysctl_ip_vs_secure_tcp = 1;
+ }
+ break;
+ case 3:
+ if (old_secure_tcp < 2)
+ to_change = 1;
+ break;
+ }
+ old_secure_tcp = sysctl_ip_vs_secure_tcp;
+ if (to_change >= 0)
+ ip_vs_protocol_timeout_change(sysctl_ip_vs_secure_tcp>1);
+ write_unlock(&__ip_vs_securetcp_lock);
+}
+
+
+/*
+ * Timer for checking the defense
+ */
+#define DEFENSE_TIMER_PERIOD 1*HZ
+static void defense_work_handler(void *data);
+static DECLARE_WORK(defense_work, defense_work_handler, NULL);
+
+static void defense_work_handler(void *data)
+{
+ update_defense_level();
+ if (atomic_read(&ip_vs_dropentry))
+ ip_vs_random_dropentry();
+
+ schedule_delayed_work(&defense_work, DEFENSE_TIMER_PERIOD);
+}
+
+int
+ip_vs_use_count_inc(void)
+{
+ return try_module_get(THIS_MODULE);
+}
+
+void
+ip_vs_use_count_dec(void)
+{
+ module_put(THIS_MODULE);
+}
+
+
+/*
+ * Hash table: for virtual service lookups
+ */
+#define IP_VS_SVC_TAB_BITS 8
+#define IP_VS_SVC_TAB_SIZE (1 << IP_VS_SVC_TAB_BITS)
+#define IP_VS_SVC_TAB_MASK (IP_VS_SVC_TAB_SIZE - 1)
+
+/* the service table hashed by <protocol, addr, port> */
+static struct list_head ip_vs_svc_table[IP_VS_SVC_TAB_SIZE];
+/* the service table hashed by fwmark */
+static struct list_head ip_vs_svc_fwm_table[IP_VS_SVC_TAB_SIZE];
+
+/*
+ * Hash table: for real service lookups
+ */
+#define IP_VS_RTAB_BITS 4
+#define IP_VS_RTAB_SIZE (1 << IP_VS_RTAB_BITS)
+#define IP_VS_RTAB_MASK (IP_VS_RTAB_SIZE - 1)
+
+static struct list_head ip_vs_rtable[IP_VS_RTAB_SIZE];
+
+/*
+ * Trash for destinations
+ */
+static LIST_HEAD(ip_vs_dest_trash);
+
+/*
+ * FTP & NULL virtual service counters
+ */
+static atomic_t ip_vs_ftpsvc_counter = ATOMIC_INIT(0);
+static atomic_t ip_vs_nullsvc_counter = ATOMIC_INIT(0);
+
+
+/*
+ * Returns hash value for virtual service
+ */
+static __inline__ unsigned
+ip_vs_svc_hashkey(unsigned proto, __u32 addr, __u16 port)
+{
+ register unsigned porth = ntohs(port);
+
+ return (proto^ntohl(addr)^(porth>>IP_VS_SVC_TAB_BITS)^porth)
+ & IP_VS_SVC_TAB_MASK;
+}
+
+/*
+ * Returns hash value of fwmark for virtual service lookup
+ */
+static __inline__ unsigned ip_vs_svc_fwm_hashkey(__u32 fwmark)
+{
+ return fwmark & IP_VS_SVC_TAB_MASK;
+}
+
+/*
+ * Hashes a service in the ip_vs_svc_table by <proto,addr,port>
+ * or in the ip_vs_svc_fwm_table by fwmark.
+ * Should be called with locked tables.
+ */
+static int ip_vs_svc_hash(struct ip_vs_service *svc)
+{
+ unsigned hash;
+
+ if (svc->flags & IP_VS_SVC_F_HASHED) {
+ IP_VS_ERR("ip_vs_svc_hash(): request for already hashed, "
+ "called from %p\n", __builtin_return_address(0));
+ return 0;
+ }
+
+ if (svc->fwmark == 0) {
+ /*
+ * Hash it by <protocol,addr,port> in ip_vs_svc_table
+ */
+ hash = ip_vs_svc_hashkey(svc->protocol, svc->addr, svc->port);
+ list_add(&svc->s_list, &ip_vs_svc_table[hash]);
+ } else {
+ /*
+ * Hash it by fwmark in ip_vs_svc_fwm_table
+ */
+ hash = ip_vs_svc_fwm_hashkey(svc->fwmark);
+ list_add(&svc->f_list, &ip_vs_svc_fwm_table[hash]);
+ }
+
+ svc->flags |= IP_VS_SVC_F_HASHED;
+ /* increase its refcnt because it is referenced by the svc table */
+ atomic_inc(&svc->refcnt);
+ return 1;
+}
+
+
+/*
+ * Unhashes a service from ip_vs_svc_table/ip_vs_svc_fwm_table.
+ * Should be called with locked tables.
+ */
+static int ip_vs_svc_unhash(struct ip_vs_service *svc)
+{
+ if (!(svc->flags & IP_VS_SVC_F_HASHED)) {
+ IP_VS_ERR("ip_vs_svc_unhash(): request for unhash flagged, "
+ "called from %p\n", __builtin_return_address(0));
+ return 0;
+ }
+
+ if (svc->fwmark == 0) {
+ /* Remove it from the ip_vs_svc_table table */
+ list_del(&svc->s_list);
+ } else {
+ /* Remove it from the ip_vs_svc_fwm_table table */
+ list_del(&svc->f_list);
+ }
+
+ svc->flags &= ~IP_VS_SVC_F_HASHED;
+ atomic_dec(&svc->refcnt);
+ return 1;
+}
+
+
+/*
+ * Get service by {proto,addr,port} in the service table.
+ */
+static __inline__ struct ip_vs_service *
+__ip_vs_service_get(__u16 protocol, __u32 vaddr, __u16 vport)
+{
+ unsigned hash;
+ struct ip_vs_service *svc;
+
+ /* Check for "full" addressed entries */
+ hash = ip_vs_svc_hashkey(protocol, vaddr, vport);
+
+ list_for_each_entry(svc, &ip_vs_svc_table[hash], s_list){
+ if ((svc->addr == vaddr)
+ && (svc->port == vport)
+ && (svc->protocol == protocol)) {
+ /* HIT */
+ atomic_inc(&svc->usecnt);
+ return svc;
+ }
+ }
+
+ return NULL;
+}
+
+
+/*
+ * Get service by {fwmark} in the service table.
+ */
+static __inline__ struct ip_vs_service *__ip_vs_svc_fwm_get(__u32 fwmark)
+{
+ unsigned hash;
+ struct ip_vs_service *svc;
+
+ /* Check for fwmark addressed entries */
+ hash = ip_vs_svc_fwm_hashkey(fwmark);
+
+ list_for_each_entry(svc, &ip_vs_svc_fwm_table[hash], f_list) {
+ if (svc->fwmark == fwmark) {
+ /* HIT */
+ atomic_inc(&svc->usecnt);
+ return svc;
+ }
+ }
+
+ return NULL;
+}
+
+struct ip_vs_service *
+ip_vs_service_get(__u32 fwmark, __u16 protocol, __u32 vaddr, __u16 vport)
+{
+ struct ip_vs_service *svc;
+
+ read_lock(&__ip_vs_svc_lock);
+
+ /*
+ * Check the table hashed by fwmark first
+ */
+ if (fwmark && (svc = __ip_vs_svc_fwm_get(fwmark)))
+ goto out;
+
+ /*
+ * Check the table hashed by <protocol,addr,port>
+ * for "full" addressed entries
+ */
+ svc = __ip_vs_service_get(protocol, vaddr, vport);
+
+ if (svc == NULL
+ && protocol == IPPROTO_TCP
+ && atomic_read(&ip_vs_ftpsvc_counter)
+ && (vport == FTPDATA || ntohs(vport) >= PROT_SOCK)) {
+ /*
+ * Check if ftp service entry exists, the packet
+ * might belong to FTP data connections.
+ */
+ svc = __ip_vs_service_get(protocol, vaddr, FTPPORT);
+ }
+
+ if (svc == NULL
+ && atomic_read(&ip_vs_nullsvc_counter)) {
+ /*
+ * Check if the catch-all port (port zero) exists
+ */
+ svc = __ip_vs_service_get(protocol, vaddr, 0);
+ }
+
+ out:
+ read_unlock(&__ip_vs_svc_lock);
+
+ IP_VS_DBG(6, "lookup service: fwm %u %s %u.%u.%u.%u:%u %s\n",
+ fwmark, ip_vs_proto_name(protocol),
+ NIPQUAD(vaddr), ntohs(vport),
+ svc?"hit":"not hit");
+
+ return svc;
+}
+
+
+static inline void
+__ip_vs_bind_svc(struct ip_vs_dest *dest, struct ip_vs_service *svc)
+{
+ atomic_inc(&svc->refcnt);
+ dest->svc = svc;
+}
+
+static inline void
+__ip_vs_unbind_svc(struct ip_vs_dest *dest)
+{
+ struct ip_vs_service *svc = dest->svc;
+
+ dest->svc = NULL;
+ if (atomic_dec_and_test(&svc->refcnt))
+ kfree(svc);
+}
+
+
+/*
+ * Returns hash value for real service
+ */
+static __inline__ unsigned ip_vs_rs_hashkey(__u32 addr, __u16 port)
+{
+ register unsigned porth = ntohs(port);
+
+ return (ntohl(addr)^(porth>>IP_VS_RTAB_BITS)^porth)
+ & IP_VS_RTAB_MASK;
+}
+
+/*
+ * Hashes ip_vs_dest in ip_vs_rtable by <proto,addr,port>.
+ * should be called with locked tables.
+ */
+static int ip_vs_rs_hash(struct ip_vs_dest *dest)
+{
+ unsigned hash;
+
+ if (!list_empty(&dest->d_list)) {
+ return 0;
+ }
+
+ /*
+ * Hash by proto,addr,port,
+ * which are the parameters of the real service.
+ */
+ hash = ip_vs_rs_hashkey(dest->addr, dest->port);
+ list_add(&dest->d_list, &ip_vs_rtable[hash]);
+
+ return 1;
+}
+
+/*
+ * UNhashes ip_vs_dest from ip_vs_rtable.
+ * should be called with locked tables.
+ */
+static int ip_vs_rs_unhash(struct ip_vs_dest *dest)
+{
+ /*
+ * Remove it from the ip_vs_rtable table.
+ */
+ if (!list_empty(&dest->d_list)) {
+ list_del(&dest->d_list);
+ INIT_LIST_HEAD(&dest->d_list);
+ }
+
+ return 1;
+}
+
+/*
+ * Lookup real service by <proto,addr,port> in the real service table.
+ */
+struct ip_vs_dest *
+ip_vs_lookup_real_service(__u16 protocol, __u32 daddr, __u16 dport)
+{
+ unsigned hash;
+ struct ip_vs_dest *dest;
+
+ /*
+ * Check for "full" addressed entries
+ * Return the first found entry
+ */
+ hash = ip_vs_rs_hashkey(daddr, dport);
+
+ read_lock(&__ip_vs_rs_lock);
+ list_for_each_entry(dest, &ip_vs_rtable[hash], d_list) {
+ if ((dest->addr == daddr)
+ && (dest->port == dport)
+ && ((dest->protocol == protocol) ||
+ dest->vfwmark)) {
+ /* HIT */
+ read_unlock(&__ip_vs_rs_lock);
+ return dest;
+ }
+ }
+ read_unlock(&__ip_vs_rs_lock);
+
+ return NULL;
+}
+
+/*
+ * Lookup destination by {addr,port} in the given service
+ */
+static struct ip_vs_dest *
+ip_vs_lookup_dest(struct ip_vs_service *svc, __u32 daddr, __u16 dport)
+{
+ struct ip_vs_dest *dest;
+
+ /*
+ * Find the destination for the given service
+ */
+ list_for_each_entry(dest, &svc->destinations, n_list) {
+ if ((dest->addr == daddr) && (dest->port == dport)) {
+ /* HIT */
+ return dest;
+ }
+ }
+
+ return NULL;
+}
+
+
+/*
+ * Lookup dest by {svc,addr,port} in the destination trash.
+ * The destination trash is used to hold the destinations that are removed
+ * from the service table but are still referenced by some conn entries.
+ * The reason to add the destination trash is when the dest is temporary
+ * down (either by administrator or by monitor program), the dest can be
+ * picked back from the trash, the remaining connections to the dest can
+ * continue, and the counting information of the dest is also useful for
+ * scheduling.
+ */
+static struct ip_vs_dest *
+ip_vs_trash_get_dest(struct ip_vs_service *svc, __u32 daddr, __u16 dport)
+{
+ struct ip_vs_dest *dest, *nxt;
+
+ /*
+ * Find the destination in trash
+ */
+ list_for_each_entry_safe(dest, nxt, &ip_vs_dest_trash, n_list) {
+ IP_VS_DBG(3, "Destination %u/%u.%u.%u.%u:%u still in trash, "
+ "refcnt=%d\n",
+ dest->vfwmark,
+ NIPQUAD(dest->addr), ntohs(dest->port),
+ atomic_read(&dest->refcnt));
+ if (dest->addr == daddr &&
+ dest->port == dport &&
+ dest->vfwmark == svc->fwmark &&
+ dest->protocol == svc->protocol &&
+ (svc->fwmark ||
+ (dest->vaddr == svc->addr &&
+ dest->vport == svc->port))) {
+ /* HIT */
+ return dest;
+ }
+
+ /*
+ * Try to purge the destination from trash if not referenced
+ */
+ if (atomic_read(&dest->refcnt) == 1) {
+ IP_VS_DBG(3, "Removing destination %u/%u.%u.%u.%u:%u "
+ "from trash\n",
+ dest->vfwmark,
+ NIPQUAD(dest->addr), ntohs(dest->port));
+ list_del(&dest->n_list);
+ ip_vs_dst_reset(dest);
+ __ip_vs_unbind_svc(dest);
+ kfree(dest);
+ }
+ }
+
+ return NULL;
+}
+
+
+/*
+ * Clean up all the destinations in the trash
+ * Called by the ip_vs_control_cleanup()
+ *
+ * When the ip_vs_control_clearup is activated by ipvs module exit,
+ * the service tables must have been flushed and all the connections
+ * are expired, and the refcnt of each destination in the trash must
+ * be 1, so we simply release them here.
+ */
+static void ip_vs_trash_cleanup(void)
+{
+ struct ip_vs_dest *dest, *nxt;
+
+ list_for_each_entry_safe(dest, nxt, &ip_vs_dest_trash, n_list) {
+ list_del(&dest->n_list);
+ ip_vs_dst_reset(dest);
+ __ip_vs_unbind_svc(dest);
+ kfree(dest);
+ }
+}
+
+
+static void
+ip_vs_zero_stats(struct ip_vs_stats *stats)
+{
+ spin_lock_bh(&stats->lock);
+ memset(stats, 0, (char *)&stats->lock - (char *)stats);
+ spin_unlock_bh(&stats->lock);
+ ip_vs_zero_estimator(stats);
+}
+
+/*
+ * Update a destination in the given service
+ */
+static void
+__ip_vs_update_dest(struct ip_vs_service *svc,
+ struct ip_vs_dest *dest, struct ip_vs_dest_user *udest)
+{
+ int conn_flags;
+
+ /* set the weight and the flags */
+ atomic_set(&dest->weight, udest->weight);
+ conn_flags = udest->conn_flags | IP_VS_CONN_F_INACTIVE;
+
+ /* check if local node and update the flags */
+ if (inet_addr_type(udest->addr) == RTN_LOCAL) {
+ conn_flags = (conn_flags & ~IP_VS_CONN_F_FWD_MASK)
+ | IP_VS_CONN_F_LOCALNODE;
+ }
+
+ /* set the IP_VS_CONN_F_NOOUTPUT flag if not masquerading/NAT */
+ if ((conn_flags & IP_VS_CONN_F_FWD_MASK) != 0) {
+ conn_flags |= IP_VS_CONN_F_NOOUTPUT;
+ } else {
+ /*
+ * Put the real service in ip_vs_rtable if not present.
+ * For now only for NAT!
+ */
+ write_lock_bh(&__ip_vs_rs_lock);
+ ip_vs_rs_hash(dest);
+ write_unlock_bh(&__ip_vs_rs_lock);
+ }
+ atomic_set(&dest->conn_flags, conn_flags);
+
+ /* bind the service */
+ if (!dest->svc) {
+ __ip_vs_bind_svc(dest, svc);
+ } else {
+ if (dest->svc != svc) {
+ __ip_vs_unbind_svc(dest);
+ ip_vs_zero_stats(&dest->stats);
+ __ip_vs_bind_svc(dest, svc);
+ }
+ }
+
+ /* set the dest status flags */
+ dest->flags |= IP_VS_DEST_F_AVAILABLE;
+
+ if (udest->u_threshold == 0 || udest->u_threshold > dest->u_threshold)
+ dest->flags &= ~IP_VS_DEST_F_OVERLOAD;
+ dest->u_threshold = udest->u_threshold;
+ dest->l_threshold = udest->l_threshold;
+}
+
+
+/*
+ * Create a destination for the given service
+ */
+static int
+ip_vs_new_dest(struct ip_vs_service *svc, struct ip_vs_dest_user *udest,
+ struct ip_vs_dest **dest_p)
+{
+ struct ip_vs_dest *dest;
+ unsigned atype;
+
+ EnterFunction(2);
+
+ atype = inet_addr_type(udest->addr);
+ if (atype != RTN_LOCAL && atype != RTN_UNICAST)
+ return -EINVAL;
+
+ dest = kmalloc(sizeof(struct ip_vs_dest), GFP_ATOMIC);
+ if (dest == NULL) {
+ IP_VS_ERR("ip_vs_new_dest: kmalloc failed.\n");
+ return -ENOMEM;
+ }
+ memset(dest, 0, sizeof(struct ip_vs_dest));
+
+ dest->protocol = svc->protocol;
+ dest->vaddr = svc->addr;
+ dest->vport = svc->port;
+ dest->vfwmark = svc->fwmark;
+ dest->addr = udest->addr;
+ dest->port = udest->port;
+
+ atomic_set(&dest->activeconns, 0);
+ atomic_set(&dest->inactconns, 0);
+ atomic_set(&dest->persistconns, 0);
+ atomic_set(&dest->refcnt, 0);
+
+ INIT_LIST_HEAD(&dest->d_list);
+ spin_lock_init(&dest->dst_lock);
+ spin_lock_init(&dest->stats.lock);
+ __ip_vs_update_dest(svc, dest, udest);
+ ip_vs_new_estimator(&dest->stats);
+
+ *dest_p = dest;
+
+ LeaveFunction(2);
+ return 0;
+}
+
+
+/*
+ * Add a destination into an existing service
+ */
+static int
+ip_vs_add_dest(struct ip_vs_service *svc, struct ip_vs_dest_user *udest)
+{
+ struct ip_vs_dest *dest;
+ __u32 daddr = udest->addr;
+ __u16 dport = udest->port;
+ int ret;
+
+ EnterFunction(2);
+
+ if (udest->weight < 0) {
+ IP_VS_ERR("ip_vs_add_dest(): server weight less than zero\n");
+ return -ERANGE;
+ }
+
+ if (udest->l_threshold > udest->u_threshold) {
+ IP_VS_ERR("ip_vs_add_dest(): lower threshold is higher than "
+ "upper threshold\n");
+ return -ERANGE;
+ }
+
+ /*
+ * Check if the dest already exists in the list
+ */
+ dest = ip_vs_lookup_dest(svc, daddr, dport);
+ if (dest != NULL) {
+ IP_VS_DBG(1, "ip_vs_add_dest(): dest already exists\n");
+ return -EEXIST;
+ }
+
+ /*
+ * Check if the dest already exists in the trash and
+ * is from the same service
+ */
+ dest = ip_vs_trash_get_dest(svc, daddr, dport);
+ if (dest != NULL) {
+ IP_VS_DBG(3, "Get destination %u.%u.%u.%u:%u from trash, "
+ "refcnt=%d, service %u/%u.%u.%u.%u:%u\n",
+ NIPQUAD(daddr), ntohs(dport),
+ atomic_read(&dest->refcnt),
+ dest->vfwmark,
+ NIPQUAD(dest->vaddr),
+ ntohs(dest->vport));
+ __ip_vs_update_dest(svc, dest, udest);
+
+ /*
+ * Get the destination from the trash
+ */
+ list_del(&dest->n_list);
+
+ ip_vs_new_estimator(&dest->stats);
+
+ write_lock_bh(&__ip_vs_svc_lock);
+
+ /*
+ * Wait until all other svc users go away.
+ */
+ IP_VS_WAIT_WHILE(atomic_read(&svc->usecnt) > 1);
+
+ list_add(&dest->n_list, &svc->destinations);
+ svc->num_dests++;
+
+ /* call the update_service function of its scheduler */
+ svc->scheduler->update_service(svc);
+
+ write_unlock_bh(&__ip_vs_svc_lock);
+ return 0;
+ }
+
+ /*
+ * Allocate and initialize the dest structure
+ */
+ ret = ip_vs_new_dest(svc, udest, &dest);
+ if (ret) {
+ return ret;
+ }
+
+ /*
+ * Add the dest entry into the list
+ */
+ atomic_inc(&dest->refcnt);
+
+ write_lock_bh(&__ip_vs_svc_lock);
+
+ /*
+ * Wait until all other svc users go away.
+ */
+ IP_VS_WAIT_WHILE(atomic_read(&svc->usecnt) > 1);
+
+ list_add(&dest->n_list, &svc->destinations);
+ svc->num_dests++;
+
+ /* call the update_service function of its scheduler */
+ svc->scheduler->update_service(svc);
+
+ write_unlock_bh(&__ip_vs_svc_lock);
+
+ LeaveFunction(2);
+
+ return 0;
+}
+
+
+/*
+ * Edit a destination in the given service
+ */
+static int
+ip_vs_edit_dest(struct ip_vs_service *svc, struct ip_vs_dest_user *udest)
+{
+ struct ip_vs_dest *dest;
+ __u32 daddr = udest->addr;
+ __u16 dport = udest->port;
+
+ EnterFunction(2);
+
+ if (udest->weight < 0) {
+ IP_VS_ERR("ip_vs_edit_dest(): server weight less than zero\n");
+ return -ERANGE;
+ }
+
+ if (udest->l_threshold > udest->u_threshold) {
+ IP_VS_ERR("ip_vs_edit_dest(): lower threshold is higher than "
+ "upper threshold\n");
+ return -ERANGE;
+ }
+
+ /*
+ * Lookup the destination list
+ */
+ dest = ip_vs_lookup_dest(svc, daddr, dport);
+ if (dest == NULL) {
+ IP_VS_DBG(1, "ip_vs_edit_dest(): dest doesn't exist\n");
+ return -ENOENT;
+ }
+
+ __ip_vs_update_dest(svc, dest, udest);
+
+ write_lock_bh(&__ip_vs_svc_lock);
+
+ /* Wait until all other svc users go away */
+ while (atomic_read(&svc->usecnt) > 1) {};
+
+ /* call the update_service, because server weight may be changed */
+ svc->scheduler->update_service(svc);
+
+ write_unlock_bh(&__ip_vs_svc_lock);
+
+ LeaveFunction(2);
+
+ return 0;
+}
+
+
+/*
+ * Delete a destination (must be already unlinked from the service)
+ */
+static void __ip_vs_del_dest(struct ip_vs_dest *dest)
+{
+ ip_vs_kill_estimator(&dest->stats);
+
+ /*
+ * Remove it from the d-linked list with the real services.
+ */
+ write_lock_bh(&__ip_vs_rs_lock);
+ ip_vs_rs_unhash(dest);
+ write_unlock_bh(&__ip_vs_rs_lock);
+
+ /*
+ * Decrease the refcnt of the dest, and free the dest
+ * if nobody refers to it (refcnt=0). Otherwise, throw
+ * the destination into the trash.
+ */
+ if (atomic_dec_and_test(&dest->refcnt)) {
+ ip_vs_dst_reset(dest);
+ /* simply decrease svc->refcnt here, let the caller check
+ and release the service if nobody refers to it.
+ Only user context can release destination and service,
+ and only one user context can update virtual service at a
+ time, so the operation here is OK */
+ atomic_dec(&dest->svc->refcnt);
+ kfree(dest);
+ } else {
+ IP_VS_DBG(3, "Moving dest %u.%u.%u.%u:%u into trash, refcnt=%d\n",
+ NIPQUAD(dest->addr), ntohs(dest->port),
+ atomic_read(&dest->refcnt));
+ list_add(&dest->n_list, &ip_vs_dest_trash);
+ atomic_inc(&dest->refcnt);
+ }
+}
+
+
+/*
+ * Unlink a destination from the given service
+ */
+static void __ip_vs_unlink_dest(struct ip_vs_service *svc,
+ struct ip_vs_dest *dest,
+ int svcupd)
+{
+ dest->flags &= ~IP_VS_DEST_F_AVAILABLE;
+
+ /*
+ * Remove it from the d-linked destination list.
+ */
+ list_del(&dest->n_list);
+ svc->num_dests--;
+ if (svcupd) {
+ /*
+ * Call the update_service function of its scheduler
+ */
+ svc->scheduler->update_service(svc);
+ }
+}
+
+
+/*
+ * Delete a destination server in the given service
+ */
+static int
+ip_vs_del_dest(struct ip_vs_service *svc,struct ip_vs_dest_user *udest)
+{
+ struct ip_vs_dest *dest;
+ __u32 daddr = udest->addr;
+ __u16 dport = udest->port;
+
+ EnterFunction(2);
+
+ dest = ip_vs_lookup_dest(svc, daddr, dport);
+ if (dest == NULL) {
+ IP_VS_DBG(1, "ip_vs_del_dest(): destination not found!\n");
+ return -ENOENT;
+ }
+
+ write_lock_bh(&__ip_vs_svc_lock);
+
+ /*
+ * Wait until all other svc users go away.
+ */
+ IP_VS_WAIT_WHILE(atomic_read(&svc->usecnt) > 1);
+
+ /*
+ * Unlink dest from the service
+ */
+ __ip_vs_unlink_dest(svc, dest, 1);
+
+ write_unlock_bh(&__ip_vs_svc_lock);
+
+ /*
+ * Delete the destination
+ */
+ __ip_vs_del_dest(dest);
+
+ LeaveFunction(2);
+
+ return 0;
+}
+
+
+/*
+ * Add a service into the service hash table
+ */
+static int
+ip_vs_add_service(struct ip_vs_service_user *u, struct ip_vs_service **svc_p)
+{
+ int ret = 0;
+ struct ip_vs_scheduler *sched = NULL;
+ struct ip_vs_service *svc = NULL;
+
+ /* increase the module use count */
+ ip_vs_use_count_inc();
+
+ /* Lookup the scheduler by 'u->sched_name' */
+ sched = ip_vs_scheduler_get(u->sched_name);
+ if (sched == NULL) {
+ IP_VS_INFO("Scheduler module ip_vs_%s not found\n",
+ u->sched_name);
+ ret = -ENOENT;
+ goto out_mod_dec;
+ }
+
+ svc = (struct ip_vs_service *)
+ kmalloc(sizeof(struct ip_vs_service), GFP_ATOMIC);
+ if (svc == NULL) {
+ IP_VS_DBG(1, "ip_vs_add_service: kmalloc failed.\n");
+ ret = -ENOMEM;
+ goto out_err;
+ }
+ memset(svc, 0, sizeof(struct ip_vs_service));
+
+ /* I'm the first user of the service */
+ atomic_set(&svc->usecnt, 1);
+ atomic_set(&svc->refcnt, 0);
+
+ svc->protocol = u->protocol;
+ svc->addr = u->addr;
+ svc->port = u->port;
+ svc->fwmark = u->fwmark;
+ svc->flags = u->flags;
+ svc->timeout = u->timeout * HZ;
+ svc->netmask = u->netmask;
+
+ INIT_LIST_HEAD(&svc->destinations);
+ rwlock_init(&svc->sched_lock);
+ spin_lock_init(&svc->stats.lock);
+
+ /* Bind the scheduler */
+ ret = ip_vs_bind_scheduler(svc, sched);
+ if (ret)
+ goto out_err;
+ sched = NULL;
+
+ /* Update the virtual service counters */
+ if (svc->port == FTPPORT)
+ atomic_inc(&ip_vs_ftpsvc_counter);
+ else if (svc->port == 0)
+ atomic_inc(&ip_vs_nullsvc_counter);
+
+ ip_vs_new_estimator(&svc->stats);
+ ip_vs_num_services++;
+
+ /* Hash the service into the service table */
+ write_lock_bh(&__ip_vs_svc_lock);
+ ip_vs_svc_hash(svc);
+ write_unlock_bh(&__ip_vs_svc_lock);
+
+ *svc_p = svc;
+ return 0;
+
+ out_err:
+ if (svc != NULL) {
+ if (svc->scheduler)
+ ip_vs_unbind_scheduler(svc);
+ if (svc->inc) {
+ local_bh_disable();
+ ip_vs_app_inc_put(svc->inc);
+ local_bh_enable();
+ }
+ kfree(svc);
+ }
+ ip_vs_scheduler_put(sched);
+
+ out_mod_dec:
+ /* decrease the module use count */
+ ip_vs_use_count_dec();
+
+ return ret;
+}
+
+
+/*
+ * Edit a service and bind it with a new scheduler
+ */
+static int
+ip_vs_edit_service(struct ip_vs_service *svc, struct ip_vs_service_user *u)
+{
+ struct ip_vs_scheduler *sched, *old_sched;
+ int ret = 0;
+
+ /*
+ * Lookup the scheduler, by 'u->sched_name'
+ */
+ sched = ip_vs_scheduler_get(u->sched_name);
+ if (sched == NULL) {
+ IP_VS_INFO("Scheduler module ip_vs_%s not found\n",
+ u->sched_name);
+ return -ENOENT;
+ }
+ old_sched = sched;
+
+ write_lock_bh(&__ip_vs_svc_lock);
+
+ /*
+ * Wait until all other svc users go away.
+ */
+ IP_VS_WAIT_WHILE(atomic_read(&svc->usecnt) > 1);
+
+ /*
+ * Set the flags and timeout value
+ */
+ svc->flags = u->flags | IP_VS_SVC_F_HASHED;
+ svc->timeout = u->timeout * HZ;
+ svc->netmask = u->netmask;
+
+ old_sched = svc->scheduler;
+ if (sched != old_sched) {
+ /*
+ * Unbind the old scheduler
+ */
+ if ((ret = ip_vs_unbind_scheduler(svc))) {
+ old_sched = sched;
+ goto out;
+ }
+
+ /*
+ * Bind the new scheduler
+ */
+ if ((ret = ip_vs_bind_scheduler(svc, sched))) {
+ /*
+ * If ip_vs_bind_scheduler fails, restore the old
+ * scheduler.
+ * The main reason of failure is out of memory.
+ *
+ * The question is if the old scheduler can be
+ * restored all the time. TODO: if it cannot be
+ * restored some time, we must delete the service,
+ * otherwise the system may crash.
+ */
+ ip_vs_bind_scheduler(svc, old_sched);
+ old_sched = sched;
+ goto out;
+ }
+ }
+
+ out:
+ write_unlock_bh(&__ip_vs_svc_lock);
+
+ if (old_sched)
+ ip_vs_scheduler_put(old_sched);
+
+ return ret;
+}
+
+
+/*
+ * Delete a service from the service list
+ * - The service must be unlinked, unlocked and not referenced!
+ * - We are called under _bh lock
+ */
+static void __ip_vs_del_service(struct ip_vs_service *svc)
+{
+ struct ip_vs_dest *dest, *nxt;
+ struct ip_vs_scheduler *old_sched;
+
+ ip_vs_num_services--;
+ ip_vs_kill_estimator(&svc->stats);
+
+ /* Unbind scheduler */
+ old_sched = svc->scheduler;
+ ip_vs_unbind_scheduler(svc);
+ if (old_sched)
+ ip_vs_scheduler_put(old_sched);
+
+ /* Unbind app inc */
+ if (svc->inc) {
+ ip_vs_app_inc_put(svc->inc);
+ svc->inc = NULL;
+ }
+
+ /*
+ * Unlink the whole destination list
+ */
+ list_for_each_entry_safe(dest, nxt, &svc->destinations, n_list) {
+ __ip_vs_unlink_dest(svc, dest, 0);
+ __ip_vs_del_dest(dest);
+ }
+
+ /*
+ * Update the virtual service counters
+ */
+ if (svc->port == FTPPORT)
+ atomic_dec(&ip_vs_ftpsvc_counter);
+ else if (svc->port == 0)
+ atomic_dec(&ip_vs_nullsvc_counter);
+
+ /*
+ * Free the service if nobody refers to it
+ */
+ if (atomic_read(&svc->refcnt) == 0)
+ kfree(svc);
+
+ /* decrease the module use count */
+ ip_vs_use_count_dec();
+}
+
+/*
+ * Delete a service from the service list
+ */
+static int ip_vs_del_service(struct ip_vs_service *svc)
+{
+ if (svc == NULL)
+ return -EEXIST;
+
+ /*
+ * Unhash it from the service table
+ */
+ write_lock_bh(&__ip_vs_svc_lock);
+
+ ip_vs_svc_unhash(svc);
+
+ /*
+ * Wait until all the svc users go away.
+ */
+ IP_VS_WAIT_WHILE(atomic_read(&svc->usecnt) > 1);
+
+ __ip_vs_del_service(svc);
+
+ write_unlock_bh(&__ip_vs_svc_lock);
+
+ return 0;
+}
+
+
+/*
+ * Flush all the virtual services
+ */
+static int ip_vs_flush(void)
+{
+ int idx;
+ struct ip_vs_service *svc, *nxt;
+
+ /*
+ * Flush the service table hashed by <protocol,addr,port>
+ */
+ for(idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
+ list_for_each_entry_safe(svc, nxt, &ip_vs_svc_table[idx], s_list) {
+ write_lock_bh(&__ip_vs_svc_lock);
+ ip_vs_svc_unhash(svc);
+ /*
+ * Wait until all the svc users go away.
+ */
+ IP_VS_WAIT_WHILE(atomic_read(&svc->usecnt) > 0);
+ __ip_vs_del_service(svc);
+ write_unlock_bh(&__ip_vs_svc_lock);
+ }
+ }
+
+ /*
+ * Flush the service table hashed by fwmark
+ */
+ for(idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
+ list_for_each_entry_safe(svc, nxt,
+ &ip_vs_svc_fwm_table[idx], f_list) {
+ write_lock_bh(&__ip_vs_svc_lock);
+ ip_vs_svc_unhash(svc);
+ /*
+ * Wait until all the svc users go away.
+ */
+ IP_VS_WAIT_WHILE(atomic_read(&svc->usecnt) > 0);
+ __ip_vs_del_service(svc);
+ write_unlock_bh(&__ip_vs_svc_lock);
+ }
+ }
+
+ return 0;
+}
+
+
+/*
+ * Zero counters in a service or all services
+ */
+static int ip_vs_zero_service(struct ip_vs_service *svc)
+{
+ struct ip_vs_dest *dest;
+
+ write_lock_bh(&__ip_vs_svc_lock);
+ list_for_each_entry(dest, &svc->destinations, n_list) {
+ ip_vs_zero_stats(&dest->stats);
+ }
+ ip_vs_zero_stats(&svc->stats);
+ write_unlock_bh(&__ip_vs_svc_lock);
+ return 0;
+}
+
+static int ip_vs_zero_all(void)
+{
+ int idx;
+ struct ip_vs_service *svc;
+
+ for(idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
+ list_for_each_entry(svc, &ip_vs_svc_table[idx], s_list) {
+ ip_vs_zero_service(svc);
+ }
+ }
+
+ for(idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
+ list_for_each_entry(svc, &ip_vs_svc_fwm_table[idx], f_list) {
+ ip_vs_zero_service(svc);
+ }
+ }
+
+ ip_vs_zero_stats(&ip_vs_stats);
+ return 0;
+}
+
+
+static int
+proc_do_defense_mode(ctl_table *table, int write, struct file * filp,
+ void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+ int *valp = table->data;
+ int val = *valp;
+ int rc;
+
+ rc = proc_dointvec(table, write, filp, buffer, lenp, ppos);
+ if (write && (*valp != val)) {
+ if ((*valp < 0) || (*valp > 3)) {
+ /* Restore the correct value */
+ *valp = val;
+ } else {
+ local_bh_disable();
+ update_defense_level();
+ local_bh_enable();
+ }
+ }
+ return rc;
+}
+
+
+static int
+proc_do_sync_threshold(ctl_table *table, int write, struct file *filp,
+ void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+ int *valp = table->data;
+ int val[2];
+ int rc;
+
+ /* backup the value first */
+ memcpy(val, valp, sizeof(val));
+
+ rc = proc_dointvec(table, write, filp, buffer, lenp, ppos);
+ if (write && (valp[0] < 0 || valp[1] < 0 || valp[0] >= valp[1])) {
+ /* Restore the correct value */
+ memcpy(valp, val, sizeof(val));
+ }
+ return rc;
+}
+
+
+/*
+ * IPVS sysctl table (under the /proc/sys/net/ipv4/vs/)
+ */
+
+static struct ctl_table vs_vars[] = {
+ {
+ .ctl_name = NET_IPV4_VS_AMEMTHRESH,
+ .procname = "amemthresh",
+ .data = &sysctl_ip_vs_amemthresh,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec,
+ },
+#ifdef CONFIG_IP_VS_DEBUG
+ {
+ .ctl_name = NET_IPV4_VS_DEBUG_LEVEL,
+ .procname = "debug_level",
+ .data = &sysctl_ip_vs_debug_level,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec,
+ },
+#endif
+ {
+ .ctl_name = NET_IPV4_VS_AMDROPRATE,
+ .procname = "am_droprate",
+ .data = &sysctl_ip_vs_am_droprate,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec,
+ },
+ {
+ .ctl_name = NET_IPV4_VS_DROP_ENTRY,
+ .procname = "drop_entry",
+ .data = &sysctl_ip_vs_drop_entry,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_do_defense_mode,
+ },
+ {
+ .ctl_name = NET_IPV4_VS_DROP_PACKET,
+ .procname = "drop_packet",
+ .data = &sysctl_ip_vs_drop_packet,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_do_defense_mode,
+ },
+ {
+ .ctl_name = NET_IPV4_VS_SECURE_TCP,
+ .procname = "secure_tcp",
+ .data = &sysctl_ip_vs_secure_tcp,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_do_defense_mode,
+ },
+#if 0
+ {
+ .ctl_name = NET_IPV4_VS_TO_ES,
+ .procname = "timeout_established",
+ .data = &vs_timeout_table_dos.timeout[IP_VS_S_ESTABLISHED],
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec_jiffies,
+ },
+ {
+ .ctl_name = NET_IPV4_VS_TO_SS,
+ .procname = "timeout_synsent",
+ .data = &vs_timeout_table_dos.timeout[IP_VS_S_SYN_SENT],
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec_jiffies,
+ },
+ {
+ .ctl_name = NET_IPV4_VS_TO_SR,
+ .procname = "timeout_synrecv",
+ .data = &vs_timeout_table_dos.timeout[IP_VS_S_SYN_RECV],
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec_jiffies,
+ },
+ {
+ .ctl_name = NET_IPV4_VS_TO_FW,
+ .procname = "timeout_finwait",
+ .data = &vs_timeout_table_dos.timeout[IP_VS_S_FIN_WAIT],
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec_jiffies,
+ },
+ {
+ .ctl_name = NET_IPV4_VS_TO_TW,
+ .procname = "timeout_timewait",
+ .data = &vs_timeout_table_dos.timeout[IP_VS_S_TIME_WAIT],
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec_jiffies,
+ },
+ {
+ .ctl_name = NET_IPV4_VS_TO_CL,
+ .procname = "timeout_close",
+ .data = &vs_timeout_table_dos.timeout[IP_VS_S_CLOSE],
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec_jiffies,
+ },
+ {
+ .ctl_name = NET_IPV4_VS_TO_CW,
+ .procname = "timeout_closewait",
+ .data = &vs_timeout_table_dos.timeout[IP_VS_S_CLOSE_WAIT],
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec_jiffies,
+ },
+ {
+ .ctl_name = NET_IPV4_VS_TO_LA,
+ .procname = "timeout_lastack",
+ .data = &vs_timeout_table_dos.timeout[IP_VS_S_LAST_ACK],
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec_jiffies,
+ },
+ {
+ .ctl_name = NET_IPV4_VS_TO_LI,
+ .procname = "timeout_listen",
+ .data = &vs_timeout_table_dos.timeout[IP_VS_S_LISTEN],
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec_jiffies,
+ },
+ {
+ .ctl_name = NET_IPV4_VS_TO_SA,
+ .procname = "timeout_synack",
+ .data = &vs_timeout_table_dos.timeout[IP_VS_S_SYNACK],
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec_jiffies,
+ },
+ {
+ .ctl_name = NET_IPV4_VS_TO_UDP,
+ .procname = "timeout_udp",
+ .data = &vs_timeout_table_dos.timeout[IP_VS_S_UDP],
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec_jiffies,
+ },
+ {
+ .ctl_name = NET_IPV4_VS_TO_ICMP,
+ .procname = "timeout_icmp",
+ .data = &vs_timeout_table_dos.timeout[IP_VS_S_ICMP],
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec_jiffies,
+ },
+#endif
+ {
+ .ctl_name = NET_IPV4_VS_CACHE_BYPASS,
+ .procname = "cache_bypass",
+ .data = &sysctl_ip_vs_cache_bypass,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec,
+ },
+ {
+ .ctl_name = NET_IPV4_VS_EXPIRE_NODEST_CONN,
+ .procname = "expire_nodest_conn",
+ .data = &sysctl_ip_vs_expire_nodest_conn,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec,
+ },
+ {
+ .ctl_name = NET_IPV4_VS_EXPIRE_QUIESCENT_TEMPLATE,
+ .procname = "expire_quiescent_template",
+ .data = &sysctl_ip_vs_expire_quiescent_template,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec,
+ },
+ {
+ .ctl_name = NET_IPV4_VS_SYNC_THRESHOLD,
+ .procname = "sync_threshold",
+ .data = &sysctl_ip_vs_sync_threshold,
+ .maxlen = sizeof(sysctl_ip_vs_sync_threshold),
+ .mode = 0644,
+ .proc_handler = &proc_do_sync_threshold,
+ },
+ {
+ .ctl_name = NET_IPV4_VS_NAT_ICMP_SEND,
+ .procname = "nat_icmp_send",
+ .data = &sysctl_ip_vs_nat_icmp_send,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec,
+ },
+ { .ctl_name = 0 }
+};
+
+static ctl_table vs_table[] = {
+ {
+ .ctl_name = NET_IPV4_VS,
+ .procname = "vs",
+ .mode = 0555,
+ .child = vs_vars
+ },
+ { .ctl_name = 0 }
+};
+
+static ctl_table ipv4_table[] = {
+ {
+ .ctl_name = NET_IPV4,
+ .procname = "ipv4",
+ .mode = 0555,
+ .child = vs_table,
+ },
+ { .ctl_name = 0 }
+};
+
+static ctl_table vs_root_table[] = {
+ {
+ .ctl_name = CTL_NET,
+ .procname = "net",
+ .mode = 0555,
+ .child = ipv4_table,
+ },
+ { .ctl_name = 0 }
+};
+
+static struct ctl_table_header * sysctl_header;
+
+#ifdef CONFIG_PROC_FS
+
+struct ip_vs_iter {
+ struct list_head *table;
+ int bucket;
+};
+
+/*
+ * Write the contents of the VS rule table to a PROCfs file.
+ * (It is kept just for backward compatibility)
+ */
+static inline const char *ip_vs_fwd_name(unsigned flags)
+{
+ switch (flags & IP_VS_CONN_F_FWD_MASK) {
+ case IP_VS_CONN_F_LOCALNODE:
+ return "Local";
+ case IP_VS_CONN_F_TUNNEL:
+ return "Tunnel";
+ case IP_VS_CONN_F_DROUTE:
+ return "Route";
+ default:
+ return "Masq";
+ }
+}
+
+
+/* Get the Nth entry in the two lists */
+static struct ip_vs_service *ip_vs_info_array(struct seq_file *seq, loff_t pos)
+{
+ struct ip_vs_iter *iter = seq->private;
+ int idx;
+ struct ip_vs_service *svc;
+
+ /* look in hash by protocol */
+ for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
+ list_for_each_entry(svc, &ip_vs_svc_table[idx], s_list) {
+ if (pos-- == 0){
+ iter->table = ip_vs_svc_table;
+ iter->bucket = idx;
+ return svc;
+ }
+ }
+ }
+
+ /* keep looking in fwmark */
+ for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
+ list_for_each_entry(svc, &ip_vs_svc_fwm_table[idx], f_list) {
+ if (pos-- == 0) {
+ iter->table = ip_vs_svc_fwm_table;
+ iter->bucket = idx;
+ return svc;
+ }
+ }
+ }
+
+ return NULL;
+}
+
+static void *ip_vs_info_seq_start(struct seq_file *seq, loff_t *pos)
+{
+
+ read_lock_bh(&__ip_vs_svc_lock);
+ return *pos ? ip_vs_info_array(seq, *pos - 1) : SEQ_START_TOKEN;
+}
+
+
+static void *ip_vs_info_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+ struct list_head *e;
+ struct ip_vs_iter *iter;
+ struct ip_vs_service *svc;
+
+ ++*pos;
+ if (v == SEQ_START_TOKEN)
+ return ip_vs_info_array(seq,0);
+
+ svc = v;
+ iter = seq->private;
+
+ if (iter->table == ip_vs_svc_table) {
+ /* next service in table hashed by protocol */
+ if ((e = svc->s_list.next) != &ip_vs_svc_table[iter->bucket])
+ return list_entry(e, struct ip_vs_service, s_list);
+
+
+ while (++iter->bucket < IP_VS_SVC_TAB_SIZE) {
+ list_for_each_entry(svc,&ip_vs_svc_table[iter->bucket],
+ s_list) {
+ return svc;
+ }
+ }
+
+ iter->table = ip_vs_svc_fwm_table;
+ iter->bucket = -1;
+ goto scan_fwmark;
+ }
+
+ /* next service in hashed by fwmark */
+ if ((e = svc->f_list.next) != &ip_vs_svc_fwm_table[iter->bucket])
+ return list_entry(e, struct ip_vs_service, f_list);
+
+ scan_fwmark:
+ while (++iter->bucket < IP_VS_SVC_TAB_SIZE) {
+ list_for_each_entry(svc, &ip_vs_svc_fwm_table[iter->bucket],
+ f_list)
+ return svc;
+ }
+
+ return NULL;
+}
+
+static void ip_vs_info_seq_stop(struct seq_file *seq, void *v)
+{
+ read_unlock_bh(&__ip_vs_svc_lock);
+}
+
+
+static int ip_vs_info_seq_show(struct seq_file *seq, void *v)
+{
+ if (v == SEQ_START_TOKEN) {
+ seq_printf(seq,
+ "IP Virtual Server version %d.%d.%d (size=%d)\n",
+ NVERSION(IP_VS_VERSION_CODE), IP_VS_CONN_TAB_SIZE);
+ seq_puts(seq,
+ "Prot LocalAddress:Port Scheduler Flags\n");
+ seq_puts(seq,
+ " -> RemoteAddress:Port Forward Weight ActiveConn InActConn\n");
+ } else {
+ const struct ip_vs_service *svc = v;
+ const struct ip_vs_iter *iter = seq->private;
+ const struct ip_vs_dest *dest;
+
+ if (iter->table == ip_vs_svc_table)
+ seq_printf(seq, "%s %08X:%04X %s ",
+ ip_vs_proto_name(svc->protocol),
+ ntohl(svc->addr),
+ ntohs(svc->port),
+ svc->scheduler->name);
+ else
+ seq_printf(seq, "FWM %08X %s ",
+ svc->fwmark, svc->scheduler->name);
+
+ if (svc->flags & IP_VS_SVC_F_PERSISTENT)
+ seq_printf(seq, "persistent %d %08X\n",
+ svc->timeout,
+ ntohl(svc->netmask));
+ else
+ seq_putc(seq, '\n');
+
+ list_for_each_entry(dest, &svc->destinations, n_list) {
+ seq_printf(seq,
+ " -> %08X:%04X %-7s %-6d %-10d %-10d\n",
+ ntohl(dest->addr), ntohs(dest->port),
+ ip_vs_fwd_name(atomic_read(&dest->conn_flags)),
+ atomic_read(&dest->weight),
+ atomic_read(&dest->activeconns),
+ atomic_read(&dest->inactconns));
+ }
+ }
+ return 0;
+}
+
+static struct seq_operations ip_vs_info_seq_ops = {
+ .start = ip_vs_info_seq_start,
+ .next = ip_vs_info_seq_next,
+ .stop = ip_vs_info_seq_stop,
+ .show = ip_vs_info_seq_show,
+};
+
+static int ip_vs_info_open(struct inode *inode, struct file *file)
+{
+ struct seq_file *seq;
+ int rc = -ENOMEM;
+ struct ip_vs_iter *s = kmalloc(sizeof(*s), GFP_KERNEL);
+
+ if (!s)
+ goto out;
+
+ rc = seq_open(file, &ip_vs_info_seq_ops);
+ if (rc)
+ goto out_kfree;
+
+ seq = file->private_data;
+ seq->private = s;
+ memset(s, 0, sizeof(*s));
+out:
+ return rc;
+out_kfree:
+ kfree(s);
+ goto out;
+}
+
+static struct file_operations ip_vs_info_fops = {
+ .owner = THIS_MODULE,
+ .open = ip_vs_info_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release_private,
+};
+
+#endif
+
+struct ip_vs_stats ip_vs_stats;
+
+#ifdef CONFIG_PROC_FS
+static int ip_vs_stats_show(struct seq_file *seq, void *v)
+{
+
+/* 01234567 01234567 01234567 0123456701234567 0123456701234567 */
+ seq_puts(seq,
+ " Total Incoming Outgoing Incoming Outgoing\n");
+ seq_printf(seq,
+ " Conns Packets Packets Bytes Bytes\n");
+
+ spin_lock_bh(&ip_vs_stats.lock);
+ seq_printf(seq, "%8X %8X %8X %16LX %16LX\n\n", ip_vs_stats.conns,
+ ip_vs_stats.inpkts, ip_vs_stats.outpkts,
+ (unsigned long long) ip_vs_stats.inbytes,
+ (unsigned long long) ip_vs_stats.outbytes);
+
+/* 01234567 01234567 01234567 0123456701234567 0123456701234567 */
+ seq_puts(seq,
+ " Conns/s Pkts/s Pkts/s Bytes/s Bytes/s\n");
+ seq_printf(seq,"%8X %8X %8X %16X %16X\n",
+ ip_vs_stats.cps,
+ ip_vs_stats.inpps,
+ ip_vs_stats.outpps,
+ ip_vs_stats.inbps,
+ ip_vs_stats.outbps);
+ spin_unlock_bh(&ip_vs_stats.lock);
+
+ return 0;
+}
+
+static int ip_vs_stats_seq_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, ip_vs_stats_show, NULL);
+}
+
+static struct file_operations ip_vs_stats_fops = {
+ .owner = THIS_MODULE,
+ .open = ip_vs_stats_seq_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+#endif
+
+/*
+ * Set timeout values for tcp tcpfin udp in the timeout_table.
+ */
+static int ip_vs_set_timeout(struct ip_vs_timeout_user *u)
+{
+ IP_VS_DBG(2, "Setting timeout tcp:%d tcpfin:%d udp:%d\n",
+ u->tcp_timeout,
+ u->tcp_fin_timeout,
+ u->udp_timeout);
+
+#ifdef CONFIG_IP_VS_PROTO_TCP
+ if (u->tcp_timeout) {
+ ip_vs_protocol_tcp.timeout_table[IP_VS_TCP_S_ESTABLISHED]
+ = u->tcp_timeout * HZ;
+ }
+
+ if (u->tcp_fin_timeout) {
+ ip_vs_protocol_tcp.timeout_table[IP_VS_TCP_S_FIN_WAIT]
+ = u->tcp_fin_timeout * HZ;
+ }
+#endif
+
+#ifdef CONFIG_IP_VS_PROTO_UDP
+ if (u->udp_timeout) {
+ ip_vs_protocol_udp.timeout_table[IP_VS_UDP_S_NORMAL]
+ = u->udp_timeout * HZ;
+ }
+#endif
+ return 0;
+}
+
+
+#define SET_CMDID(cmd) (cmd - IP_VS_BASE_CTL)
+#define SERVICE_ARG_LEN (sizeof(struct ip_vs_service_user))
+#define SVCDEST_ARG_LEN (sizeof(struct ip_vs_service_user) + \
+ sizeof(struct ip_vs_dest_user))
+#define TIMEOUT_ARG_LEN (sizeof(struct ip_vs_timeout_user))
+#define DAEMON_ARG_LEN (sizeof(struct ip_vs_daemon_user))
+#define MAX_ARG_LEN SVCDEST_ARG_LEN
+
+static unsigned char set_arglen[SET_CMDID(IP_VS_SO_SET_MAX)+1] = {
+ [SET_CMDID(IP_VS_SO_SET_ADD)] = SERVICE_ARG_LEN,
+ [SET_CMDID(IP_VS_SO_SET_EDIT)] = SERVICE_ARG_LEN,
+ [SET_CMDID(IP_VS_SO_SET_DEL)] = SERVICE_ARG_LEN,
+ [SET_CMDID(IP_VS_SO_SET_FLUSH)] = 0,
+ [SET_CMDID(IP_VS_SO_SET_ADDDEST)] = SVCDEST_ARG_LEN,
+ [SET_CMDID(IP_VS_SO_SET_DELDEST)] = SVCDEST_ARG_LEN,
+ [SET_CMDID(IP_VS_SO_SET_EDITDEST)] = SVCDEST_ARG_LEN,
+ [SET_CMDID(IP_VS_SO_SET_TIMEOUT)] = TIMEOUT_ARG_LEN,
+ [SET_CMDID(IP_VS_SO_SET_STARTDAEMON)] = DAEMON_ARG_LEN,
+ [SET_CMDID(IP_VS_SO_SET_STOPDAEMON)] = DAEMON_ARG_LEN,
+ [SET_CMDID(IP_VS_SO_SET_ZERO)] = SERVICE_ARG_LEN,
+};
+
+static int
+do_ip_vs_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len)
+{
+ int ret;
+ unsigned char arg[MAX_ARG_LEN];
+ struct ip_vs_service_user *usvc;
+ struct ip_vs_service *svc;
+ struct ip_vs_dest_user *udest;
+
+ if (!capable(CAP_NET_ADMIN))
+ return -EPERM;
+
+ if (len != set_arglen[SET_CMDID(cmd)]) {
+ IP_VS_ERR("set_ctl: len %u != %u\n",
+ len, set_arglen[SET_CMDID(cmd)]);
+ return -EINVAL;
+ }
+
+ if (copy_from_user(arg, user, len) != 0)
+ return -EFAULT;
+
+ /* increase the module use count */
+ ip_vs_use_count_inc();
+
+ if (down_interruptible(&__ip_vs_mutex)) {
+ ret = -ERESTARTSYS;
+ goto out_dec;
+ }
+
+ if (cmd == IP_VS_SO_SET_FLUSH) {
+ /* Flush the virtual service */
+ ret = ip_vs_flush();
+ goto out_unlock;
+ } else if (cmd == IP_VS_SO_SET_TIMEOUT) {
+ /* Set timeout values for (tcp tcpfin udp) */
+ ret = ip_vs_set_timeout((struct ip_vs_timeout_user *)arg);
+ goto out_unlock;
+ } else if (cmd == IP_VS_SO_SET_STARTDAEMON) {
+ struct ip_vs_daemon_user *dm = (struct ip_vs_daemon_user *)arg;
+ ret = start_sync_thread(dm->state, dm->mcast_ifn, dm->syncid);
+ goto out_unlock;
+ } else if (cmd == IP_VS_SO_SET_STOPDAEMON) {
+ struct ip_vs_daemon_user *dm = (struct ip_vs_daemon_user *)arg;
+ ret = stop_sync_thread(dm->state);
+ goto out_unlock;
+ }
+
+ usvc = (struct ip_vs_service_user *)arg;
+ udest = (struct ip_vs_dest_user *)(usvc + 1);
+
+ if (cmd == IP_VS_SO_SET_ZERO) {
+ /* if no service address is set, zero counters in all */
+ if (!usvc->fwmark && !usvc->addr && !usvc->port) {
+ ret = ip_vs_zero_all();
+ goto out_unlock;
+ }
+ }
+
+ /* Check for valid protocol: TCP or UDP, even for fwmark!=0 */
+ if (usvc->protocol!=IPPROTO_TCP && usvc->protocol!=IPPROTO_UDP) {
+ IP_VS_ERR("set_ctl: invalid protocol: %d %d.%d.%d.%d:%d %s\n",
+ usvc->protocol, NIPQUAD(usvc->addr),
+ ntohs(usvc->port), usvc->sched_name);
+ ret = -EFAULT;
+ goto out_unlock;
+ }
+
+ /* Lookup the exact service by <protocol, addr, port> or fwmark */
+ if (usvc->fwmark == 0)
+ svc = __ip_vs_service_get(usvc->protocol,
+ usvc->addr, usvc->port);
+ else
+ svc = __ip_vs_svc_fwm_get(usvc->fwmark);
+
+ if (cmd != IP_VS_SO_SET_ADD
+ && (svc == NULL || svc->protocol != usvc->protocol)) {
+ ret = -ESRCH;
+ goto out_unlock;
+ }
+
+ switch (cmd) {
+ case IP_VS_SO_SET_ADD:
+ if (svc != NULL)
+ ret = -EEXIST;
+ else
+ ret = ip_vs_add_service(usvc, &svc);
+ break;
+ case IP_VS_SO_SET_EDIT:
+ ret = ip_vs_edit_service(svc, usvc);
+ break;
+ case IP_VS_SO_SET_DEL:
+ ret = ip_vs_del_service(svc);
+ if (!ret)
+ goto out_unlock;
+ break;
+ case IP_VS_SO_SET_ZERO:
+ ret = ip_vs_zero_service(svc);
+ break;
+ case IP_VS_SO_SET_ADDDEST:
+ ret = ip_vs_add_dest(svc, udest);
+ break;
+ case IP_VS_SO_SET_EDITDEST:
+ ret = ip_vs_edit_dest(svc, udest);
+ break;
+ case IP_VS_SO_SET_DELDEST:
+ ret = ip_vs_del_dest(svc, udest);
+ break;
+ default:
+ ret = -EINVAL;
+ }
+
+ if (svc)
+ ip_vs_service_put(svc);
+
+ out_unlock:
+ up(&__ip_vs_mutex);
+ out_dec:
+ /* decrease the module use count */
+ ip_vs_use_count_dec();
+
+ return ret;
+}
+
+
+static void
+ip_vs_copy_stats(struct ip_vs_stats_user *dst, struct ip_vs_stats *src)
+{
+ spin_lock_bh(&src->lock);
+ memcpy(dst, src, (char*)&src->lock - (char*)src);
+ spin_unlock_bh(&src->lock);
+}
+
+static void
+ip_vs_copy_service(struct ip_vs_service_entry *dst, struct ip_vs_service *src)
+{
+ dst->protocol = src->protocol;
+ dst->addr = src->addr;
+ dst->port = src->port;
+ dst->fwmark = src->fwmark;
+ strcpy(dst->sched_name, src->scheduler->name);
+ dst->flags = src->flags;
+ dst->timeout = src->timeout / HZ;
+ dst->netmask = src->netmask;
+ dst->num_dests = src->num_dests;
+ ip_vs_copy_stats(&dst->stats, &src->stats);
+}
+
+static inline int
+__ip_vs_get_service_entries(const struct ip_vs_get_services *get,
+ struct ip_vs_get_services __user *uptr)
+{
+ int idx, count=0;
+ struct ip_vs_service *svc;
+ struct ip_vs_service_entry entry;
+ int ret = 0;
+
+ for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
+ list_for_each_entry(svc, &ip_vs_svc_table[idx], s_list) {
+ if (count >= get->num_services)
+ goto out;
+ ip_vs_copy_service(&entry, svc);
+ if (copy_to_user(&uptr->entrytable[count],
+ &entry, sizeof(entry))) {
+ ret = -EFAULT;
+ goto out;
+ }
+ count++;
+ }
+ }
+
+ for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
+ list_for_each_entry(svc, &ip_vs_svc_fwm_table[idx], f_list) {
+ if (count >= get->num_services)
+ goto out;
+ ip_vs_copy_service(&entry, svc);
+ if (copy_to_user(&uptr->entrytable[count],
+ &entry, sizeof(entry))) {
+ ret = -EFAULT;
+ goto out;
+ }
+ count++;
+ }
+ }
+ out:
+ return ret;
+}
+
+static inline int
+__ip_vs_get_dest_entries(const struct ip_vs_get_dests *get,
+ struct ip_vs_get_dests __user *uptr)
+{
+ struct ip_vs_service *svc;
+ int ret = 0;
+
+ if (get->fwmark)
+ svc = __ip_vs_svc_fwm_get(get->fwmark);
+ else
+ svc = __ip_vs_service_get(get->protocol,
+ get->addr, get->port);
+ if (svc) {
+ int count = 0;
+ struct ip_vs_dest *dest;
+ struct ip_vs_dest_entry entry;
+
+ list_for_each_entry(dest, &svc->destinations, n_list) {
+ if (count >= get->num_dests)
+ break;
+
+ entry.addr = dest->addr;
+ entry.port = dest->port;
+ entry.conn_flags = atomic_read(&dest->conn_flags);
+ entry.weight = atomic_read(&dest->weight);
+ entry.u_threshold = dest->u_threshold;
+ entry.l_threshold = dest->l_threshold;
+ entry.activeconns = atomic_read(&dest->activeconns);
+ entry.inactconns = atomic_read(&dest->inactconns);
+ entry.persistconns = atomic_read(&dest->persistconns);
+ ip_vs_copy_stats(&entry.stats, &dest->stats);
+ if (copy_to_user(&uptr->entrytable[count],
+ &entry, sizeof(entry))) {
+ ret = -EFAULT;
+ break;
+ }
+ count++;
+ }
+ ip_vs_service_put(svc);
+ } else
+ ret = -ESRCH;
+ return ret;
+}
+
+static inline void
+__ip_vs_get_timeouts(struct ip_vs_timeout_user *u)
+{
+#ifdef CONFIG_IP_VS_PROTO_TCP
+ u->tcp_timeout =
+ ip_vs_protocol_tcp.timeout_table[IP_VS_TCP_S_ESTABLISHED] / HZ;
+ u->tcp_fin_timeout =
+ ip_vs_protocol_tcp.timeout_table[IP_VS_TCP_S_FIN_WAIT] / HZ;
+#endif
+#ifdef CONFIG_IP_VS_PROTO_UDP
+ u->udp_timeout =
+ ip_vs_protocol_udp.timeout_table[IP_VS_UDP_S_NORMAL] / HZ;
+#endif
+}
+
+
+#define GET_CMDID(cmd) (cmd - IP_VS_BASE_CTL)
+#define GET_INFO_ARG_LEN (sizeof(struct ip_vs_getinfo))
+#define GET_SERVICES_ARG_LEN (sizeof(struct ip_vs_get_services))
+#define GET_SERVICE_ARG_LEN (sizeof(struct ip_vs_service_entry))
+#define GET_DESTS_ARG_LEN (sizeof(struct ip_vs_get_dests))
+#define GET_TIMEOUT_ARG_LEN (sizeof(struct ip_vs_timeout_user))
+#define GET_DAEMON_ARG_LEN (sizeof(struct ip_vs_daemon_user) * 2)
+
+static unsigned char get_arglen[GET_CMDID(IP_VS_SO_GET_MAX)+1] = {
+ [GET_CMDID(IP_VS_SO_GET_VERSION)] = 64,
+ [GET_CMDID(IP_VS_SO_GET_INFO)] = GET_INFO_ARG_LEN,
+ [GET_CMDID(IP_VS_SO_GET_SERVICES)] = GET_SERVICES_ARG_LEN,
+ [GET_CMDID(IP_VS_SO_GET_SERVICE)] = GET_SERVICE_ARG_LEN,
+ [GET_CMDID(IP_VS_SO_GET_DESTS)] = GET_DESTS_ARG_LEN,
+ [GET_CMDID(IP_VS_SO_GET_TIMEOUT)] = GET_TIMEOUT_ARG_LEN,
+ [GET_CMDID(IP_VS_SO_GET_DAEMON)] = GET_DAEMON_ARG_LEN,
+};
+
+static int
+do_ip_vs_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
+{
+ unsigned char arg[128];
+ int ret = 0;
+
+ if (!capable(CAP_NET_ADMIN))
+ return -EPERM;
+
+ if (*len < get_arglen[GET_CMDID(cmd)]) {
+ IP_VS_ERR("get_ctl: len %u < %u\n",
+ *len, get_arglen[GET_CMDID(cmd)]);
+ return -EINVAL;
+ }
+
+ if (copy_from_user(arg, user, get_arglen[GET_CMDID(cmd)]) != 0)
+ return -EFAULT;
+
+ if (down_interruptible(&__ip_vs_mutex))
+ return -ERESTARTSYS;
+
+ switch (cmd) {
+ case IP_VS_SO_GET_VERSION:
+ {
+ char buf[64];
+
+ sprintf(buf, "IP Virtual Server version %d.%d.%d (size=%d)",
+ NVERSION(IP_VS_VERSION_CODE), IP_VS_CONN_TAB_SIZE);
+ if (copy_to_user(user, buf, strlen(buf)+1) != 0) {
+ ret = -EFAULT;
+ goto out;
+ }
+ *len = strlen(buf)+1;
+ }
+ break;
+
+ case IP_VS_SO_GET_INFO:
+ {
+ struct ip_vs_getinfo info;
+ info.version = IP_VS_VERSION_CODE;
+ info.size = IP_VS_CONN_TAB_SIZE;
+ info.num_services = ip_vs_num_services;
+ if (copy_to_user(user, &info, sizeof(info)) != 0)
+ ret = -EFAULT;
+ }
+ break;
+
+ case IP_VS_SO_GET_SERVICES:
+ {
+ struct ip_vs_get_services *get;
+ int size;
+
+ get = (struct ip_vs_get_services *)arg;
+ size = sizeof(*get) +
+ sizeof(struct ip_vs_service_entry) * get->num_services;
+ if (*len != size) {
+ IP_VS_ERR("length: %u != %u\n", *len, size);
+ ret = -EINVAL;
+ goto out;
+ }
+ ret = __ip_vs_get_service_entries(get, user);
+ }
+ break;
+
+ case IP_VS_SO_GET_SERVICE:
+ {
+ struct ip_vs_service_entry *entry;
+ struct ip_vs_service *svc;
+
+ entry = (struct ip_vs_service_entry *)arg;
+ if (entry->fwmark)
+ svc = __ip_vs_svc_fwm_get(entry->fwmark);
+ else
+ svc = __ip_vs_service_get(entry->protocol,
+ entry->addr, entry->port);
+ if (svc) {
+ ip_vs_copy_service(entry, svc);
+ if (copy_to_user(user, entry, sizeof(*entry)) != 0)
+ ret = -EFAULT;
+ ip_vs_service_put(svc);
+ } else
+ ret = -ESRCH;
+ }
+ break;
+
+ case IP_VS_SO_GET_DESTS:
+ {
+ struct ip_vs_get_dests *get;
+ int size;
+
+ get = (struct ip_vs_get_dests *)arg;
+ size = sizeof(*get) +
+ sizeof(struct ip_vs_dest_entry) * get->num_dests;
+ if (*len != size) {
+ IP_VS_ERR("length: %u != %u\n", *len, size);
+ ret = -EINVAL;
+ goto out;
+ }
+ ret = __ip_vs_get_dest_entries(get, user);
+ }
+ break;
+
+ case IP_VS_SO_GET_TIMEOUT:
+ {
+ struct ip_vs_timeout_user t;
+
+ __ip_vs_get_timeouts(&t);
+ if (copy_to_user(user, &t, sizeof(t)) != 0)
+ ret = -EFAULT;
+ }
+ break;
+
+ case IP_VS_SO_GET_DAEMON:
+ {
+ struct ip_vs_daemon_user d[2];
+
+ memset(&d, 0, sizeof(d));
+ if (ip_vs_sync_state & IP_VS_STATE_MASTER) {
+ d[0].state = IP_VS_STATE_MASTER;
+ strcpy(d[0].mcast_ifn, ip_vs_master_mcast_ifn);
+ d[0].syncid = ip_vs_master_syncid;
+ }
+ if (ip_vs_sync_state & IP_VS_STATE_BACKUP) {
+ d[1].state = IP_VS_STATE_BACKUP;
+ strcpy(d[1].mcast_ifn, ip_vs_backup_mcast_ifn);
+ d[1].syncid = ip_vs_backup_syncid;
+ }
+ if (copy_to_user(user, &d, sizeof(d)) != 0)
+ ret = -EFAULT;
+ }
+ break;
+
+ default:
+ ret = -EINVAL;
+ }
+
+ out:
+ up(&__ip_vs_mutex);
+ return ret;
+}
+
+
+static struct nf_sockopt_ops ip_vs_sockopts = {
+ .pf = PF_INET,
+ .set_optmin = IP_VS_BASE_CTL,
+ .set_optmax = IP_VS_SO_SET_MAX+1,
+ .set = do_ip_vs_set_ctl,
+ .get_optmin = IP_VS_BASE_CTL,
+ .get_optmax = IP_VS_SO_GET_MAX+1,
+ .get = do_ip_vs_get_ctl,
+};
+
+
+int ip_vs_control_init(void)
+{
+ int ret;
+ int idx;
+
+ EnterFunction(2);
+
+ ret = nf_register_sockopt(&ip_vs_sockopts);
+ if (ret) {
+ IP_VS_ERR("cannot register sockopt.\n");
+ return ret;
+ }
+
+ proc_net_fops_create("ip_vs", 0, &ip_vs_info_fops);
+ proc_net_fops_create("ip_vs_stats",0, &ip_vs_stats_fops);
+
+ sysctl_header = register_sysctl_table(vs_root_table, 0);
+
+ /* Initialize ip_vs_svc_table, ip_vs_svc_fwm_table, ip_vs_rtable */
+ for(idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
+ INIT_LIST_HEAD(&ip_vs_svc_table[idx]);
+ INIT_LIST_HEAD(&ip_vs_svc_fwm_table[idx]);
+ }
+ for(idx = 0; idx < IP_VS_RTAB_SIZE; idx++) {
+ INIT_LIST_HEAD(&ip_vs_rtable[idx]);
+ }
+
+ memset(&ip_vs_stats, 0, sizeof(ip_vs_stats));
+ spin_lock_init(&ip_vs_stats.lock);
+ ip_vs_new_estimator(&ip_vs_stats);
+
+ /* Hook the defense timer */
+ schedule_delayed_work(&defense_work, DEFENSE_TIMER_PERIOD);
+
+ LeaveFunction(2);
+ return 0;
+}
+
+
+void ip_vs_control_cleanup(void)
+{
+ EnterFunction(2);
+ ip_vs_trash_cleanup();
+ cancel_rearming_delayed_work(&defense_work);
+ ip_vs_kill_estimator(&ip_vs_stats);
+ unregister_sysctl_table(sysctl_header);
+ proc_net_remove("ip_vs_stats");
+ proc_net_remove("ip_vs");
+ nf_unregister_sockopt(&ip_vs_sockopts);
+ LeaveFunction(2);
+}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-02 07:22:42 +0000