| /* |
| * 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/capability.h> |
| #include <linux/fs.h> |
| #include <linux/sysctl.h> |
| #include <linux/proc_fs.h> |
| #include <linux/workqueue.h> |
| #include <linux/swap.h> |
| #include <linux/seq_file.h> |
| |
| #include <linux/netfilter.h> |
| #include <linux/netfilter_ipv4.h> |
| #include <linux/mutex.h> |
| |
| #include <net/net_namespace.h> |
| #include <net/ip.h> |
| #include <net/route.h> |
| #include <net/sock.h> |
| |
| #include <asm/uaccess.h> |
| |
| #include <net/ip_vs.h> |
| |
| /* semaphore for IPVS sockopts. And, [gs]etsockopt may sleep. */ |
| static DEFINE_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, |
| * so it needs to protect itself from softirqs |
| */ |
| 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); |
| |
| local_bh_disable(); |
| |
| /* 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); |
| |
| local_bh_enable(); |
| } |
| |
| |
| /* |
| * Timer for checking the defense |
| */ |
| #define DEFENSE_TIMER_PERIOD 1*HZ |
| static void defense_work_handler(struct work_struct *work); |
| static DECLARE_DELAYED_WORK(defense_work, defense_work_handler); |
| |
| static void defense_work_handler(struct work_struct *work) |
| { |
| 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, __be32 addr, __be16 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, __be32 vaddr, __be16 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, __be32 vaddr, __be16 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(9, "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(__be32 addr, __be16 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, __be32 daddr, __be16 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, __be32 daddr, __be16 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; |
| } |
| |
| /* |
| * Find destination by {daddr,dport,vaddr,protocol} |
| * Cretaed to be used in ip_vs_process_message() in |
| * the backup synchronization daemon. It finds the |
| * destination to be bound to the received connection |
| * on the backup. |
| * |
| * ip_vs_lookup_real_service() looked promissing, but |
| * seems not working as expected. |
| */ |
| struct ip_vs_dest *ip_vs_find_dest(__be32 daddr, __be16 dport, |
| __be32 vaddr, __be16 vport, __u16 protocol) |
| { |
| struct ip_vs_dest *dest; |
| struct ip_vs_service *svc; |
| |
| svc = ip_vs_service_get(0, protocol, vaddr, vport); |
| if (!svc) |
| return NULL; |
| dest = ip_vs_lookup_dest(svc, daddr, dport); |
| if (dest) |
| atomic_inc(&dest->refcnt); |
| ip_vs_service_put(svc); |
| return dest; |
| } |
| |
| /* |
| * 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, __be32 daddr, __be16 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, " |
| "dest->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 = kzalloc(sizeof(struct ip_vs_dest), GFP_ATOMIC); |
| if (dest == NULL) { |
| IP_VS_ERR("ip_vs_new_dest: kmalloc failed.\n"); |
| return -ENOMEM; |
| } |
| |
| 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; |
| __be32 daddr = udest->addr; |
| __be16 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, " |
| "dest->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; |
| __be32 daddr = udest->addr; |
| __be16 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 */ |
| IP_VS_WAIT_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, " |
| "dest->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; |
| __be32 daddr = udest->addr; |
| __be16 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 = kzalloc(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; |
| } |
| |
| /* 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 { |
| update_defense_level(); |
| } |
| } |
| 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[] = { |
| { |
| .procname = "amemthresh", |
| .data = &sysctl_ip_vs_amemthresh, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec, |
| }, |
| #ifdef CONFIG_IP_VS_DEBUG |
| { |
| .procname = "debug_level", |
| .data = &sysctl_ip_vs_debug_level, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec, |
| }, |
| #endif |
| { |
| .procname = "am_droprate", |
| .data = &sysctl_ip_vs_am_droprate, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec, |
| }, |
| { |
| .procname = "drop_entry", |
| .data = &sysctl_ip_vs_drop_entry, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = &proc_do_defense_mode, |
| }, |
| { |
| .procname = "drop_packet", |
| .data = &sysctl_ip_vs_drop_packet, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = &proc_do_defense_mode, |
| }, |
| { |
| .procname = "secure_tcp", |
| .data = &sysctl_ip_vs_secure_tcp, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = &proc_do_defense_mode, |
| }, |
| #if 0 |
| { |
| .procname = "timeout_established", |
| .data = &vs_timeout_table_dos.timeout[IP_VS_S_ESTABLISHED], |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec_jiffies, |
| }, |
| { |
| .procname = "timeout_synsent", |
| .data = &vs_timeout_table_dos.timeout[IP_VS_S_SYN_SENT], |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec_jiffies, |
| }, |
| { |
| .procname = "timeout_synrecv", |
| .data = &vs_timeout_table_dos.timeout[IP_VS_S_SYN_RECV], |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec_jiffies, |
| }, |
| { |
| .procname = "timeout_finwait", |
| .data = &vs_timeout_table_dos.timeout[IP_VS_S_FIN_WAIT], |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec_jiffies, |
| }, |
| { |
| .procname = "timeout_timewait", |
| .data = &vs_timeout_table_dos.timeout[IP_VS_S_TIME_WAIT], |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec_jiffies, |
| }, |
| { |
| .procname = "timeout_close", |
| .data = &vs_timeout_table_dos.timeout[IP_VS_S_CLOSE], |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec_jiffies, |
| }, |
| { |
| .procname = "timeout_closewait", |
| .data = &vs_timeout_table_dos.timeout[IP_VS_S_CLOSE_WAIT], |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec_jiffies, |
| }, |
| { |
| .procname = "timeout_lastack", |
| .data = &vs_timeout_table_dos.timeout[IP_VS_S_LAST_ACK], |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec_jiffies, |
| }, |
| { |
| .procname = "timeout_listen", |
| .data = &vs_timeout_table_dos.timeout[IP_VS_S_LISTEN], |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec_jiffies, |
| }, |
| { |
| .procname = "timeout_synack", |
| .data = &vs_timeout_table_dos.timeout[IP_VS_S_SYNACK], |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec_jiffies, |
| }, |
| { |
| .procname = "timeout_udp", |
| .data = &vs_timeout_table_dos.timeout[IP_VS_S_UDP], |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec_jiffies, |
| }, |
| { |
| .procname = "timeout_icmp", |
| .data = &vs_timeout_table_dos.timeout[IP_VS_S_ICMP], |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec_jiffies, |
| }, |
| #endif |
| { |
| .procname = "cache_bypass", |
| .data = &sysctl_ip_vs_cache_bypass, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec, |
| }, |
| { |
| .procname = "expire_nodest_conn", |
| .data = &sysctl_ip_vs_expire_nodest_conn, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec, |
| }, |
| { |
| .procname = "expire_quiescent_template", |
| .data = &sysctl_ip_vs_expire_quiescent_template, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec, |
| }, |
| { |
| .procname = "sync_threshold", |
| .data = &sysctl_ip_vs_sync_threshold, |
| .maxlen = sizeof(sysctl_ip_vs_sync_threshold), |
| .mode = 0644, |
| .proc_handler = &proc_do_sync_threshold, |
| }, |
| { |
| .procname = "nat_icmp_send", |
| .data = &sysctl_ip_vs_nat_icmp_send, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = &proc_dointvec, |
| }, |
| { .ctl_name = 0 } |
| }; |
| |
| struct ctl_path net_vs_ctl_path[] = { |
| { .procname = "net", .ctl_name = CTL_NET, }, |
| { .procname = "ipv4", .ctl_name = NET_IPV4, }, |
| { .procname = "vs", }, |
| { } |
| }; |
| EXPORT_SYMBOL_GPL(net_vs_ctl_path); |
| |
| 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 const 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) |
| { |
| return seq_open_private(file, &ip_vs_info_seq_ops, |
| sizeof(struct ip_vs_iter)); |
| } |
| |
| static const 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 const 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 const 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 (mutex_lock_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: |
| mutex_unlock(&__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; |
| strlcpy(dst->sched_name, src->scheduler->name, sizeof(dst->sched_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; |
| memset(&entry, 0, sizeof(entry)); |
| 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; |
| memset(&entry, 0, sizeof(entry)); |
| 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 const 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 (mutex_lock_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; |
| strlcpy(d[0].mcast_ifn, ip_vs_master_mcast_ifn, sizeof(d[0].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; |
| strlcpy(d[1].mcast_ifn, ip_vs_backup_mcast_ifn, sizeof(d[1].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: |
| mutex_unlock(&__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, |
| .owner = THIS_MODULE, |
| }; |
| |
| |
| 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(&init_net, "ip_vs", 0, &ip_vs_info_fops); |
| proc_net_fops_create(&init_net, "ip_vs_stats",0, &ip_vs_stats_fops); |
| |
| sysctl_header = register_sysctl_paths(net_vs_ctl_path, vs_vars); |
| |
| /* 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); |
| cancel_work_sync(&defense_work.work); |
| ip_vs_kill_estimator(&ip_vs_stats); |
| unregister_sysctl_table(sysctl_header); |
| proc_net_remove(&init_net, "ip_vs_stats"); |
| proc_net_remove(&init_net, "ip_vs"); |
| nf_unregister_sockopt(&ip_vs_sockopts); |
| LeaveFunction(2); |
| } |