diff options
Diffstat (limited to 'net/ipv4/ipvs/ip_vs_conn.c')
| -rw-r--r-- | net/ipv4/ipvs/ip_vs_conn.c | 1023 |
1 files changed, 0 insertions, 1023 deletions
diff --git a/net/ipv4/ipvs/ip_vs_conn.c b/net/ipv4/ipvs/ip_vs_conn.c deleted file mode 100644 index 44a6872dc24..00000000000 --- a/net/ipv4/ipvs/ip_vs_conn.c +++ /dev/null @@ -1,1023 +0,0 @@ -/* - * IPVS An implementation of the IP virtual server support for the - * LINUX operating system. IPVS is now implemented as a module - * over the Netfilter framework. IPVS can be used to build a - * high-performance and highly available server based on a - * cluster of servers. - * - * Authors: Wensong Zhang <wensong@linuxvirtualserver.org> - * Peter Kese <peter.kese@ijs.si> - * Julian Anastasov <ja@ssi.bg> - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation; either version - * 2 of the License, or (at your option) any later version. - * - * The IPVS code for kernel 2.2 was done by Wensong Zhang and Peter Kese, - * with changes/fixes from Julian Anastasov, Lars Marowsky-Bree, Horms - * and others. Many code here is taken from IP MASQ code of kernel 2.2. - * - * Changes: - * - */ - -#include <linux/interrupt.h> -#include <linux/in.h> -#include <linux/net.h> -#include <linux/kernel.h> -#include <linux/module.h> -#include <linux/vmalloc.h> -#include <linux/proc_fs.h> /* for proc_net_* */ -#include <linux/seq_file.h> -#include <linux/jhash.h> -#include <linux/random.h> - -#include <net/net_namespace.h> -#include <net/ip_vs.h> - - -/* - * Connection hash table: for input and output packets lookups of IPVS - */ -static struct list_head *ip_vs_conn_tab; - -/* SLAB cache for IPVS connections */ -static struct kmem_cache *ip_vs_conn_cachep __read_mostly; - -/* counter for current IPVS connections */ -static atomic_t ip_vs_conn_count = ATOMIC_INIT(0); - -/* counter for no client port connections */ -static atomic_t ip_vs_conn_no_cport_cnt = ATOMIC_INIT(0); - -/* random value for IPVS connection hash */ -static unsigned int ip_vs_conn_rnd; - -/* - * Fine locking granularity for big connection hash table - */ -#define CT_LOCKARRAY_BITS 4 -#define CT_LOCKARRAY_SIZE (1<<CT_LOCKARRAY_BITS) -#define CT_LOCKARRAY_MASK (CT_LOCKARRAY_SIZE-1) - -struct ip_vs_aligned_lock -{ - rwlock_t l; -} __attribute__((__aligned__(SMP_CACHE_BYTES))); - -/* lock array for conn table */ -static struct ip_vs_aligned_lock -__ip_vs_conntbl_lock_array[CT_LOCKARRAY_SIZE] __cacheline_aligned; - -static inline void ct_read_lock(unsigned key) -{ - read_lock(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l); -} - -static inline void ct_read_unlock(unsigned key) -{ - read_unlock(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l); -} - -static inline void ct_write_lock(unsigned key) -{ - write_lock(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l); -} - -static inline void ct_write_unlock(unsigned key) -{ - write_unlock(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l); -} - -static inline void ct_read_lock_bh(unsigned key) -{ - read_lock_bh(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l); -} - -static inline void ct_read_unlock_bh(unsigned key) -{ - read_unlock_bh(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l); -} - -static inline void ct_write_lock_bh(unsigned key) -{ - write_lock_bh(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l); -} - -static inline void ct_write_unlock_bh(unsigned key) -{ - write_unlock_bh(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l); -} - - -/* - * Returns hash value for IPVS connection entry - */ -static unsigned int ip_vs_conn_hashkey(unsigned proto, __be32 addr, __be16 port) -{ - return jhash_3words((__force u32)addr, (__force u32)port, proto, ip_vs_conn_rnd) - & IP_VS_CONN_TAB_MASK; -} - - -/* - * Hashes ip_vs_conn in ip_vs_conn_tab by proto,addr,port. - * returns bool success. - */ -static inline int ip_vs_conn_hash(struct ip_vs_conn *cp) -{ - unsigned hash; - int ret; - - /* Hash by protocol, client address and port */ - hash = ip_vs_conn_hashkey(cp->protocol, cp->caddr, cp->cport); - - ct_write_lock(hash); - - if (!(cp->flags & IP_VS_CONN_F_HASHED)) { - list_add(&cp->c_list, &ip_vs_conn_tab[hash]); - cp->flags |= IP_VS_CONN_F_HASHED; - atomic_inc(&cp->refcnt); - ret = 1; - } else { - IP_VS_ERR("ip_vs_conn_hash(): request for already hashed, " - "called from %p\n", __builtin_return_address(0)); - ret = 0; - } - - ct_write_unlock(hash); - - return ret; -} - - -/* - * UNhashes ip_vs_conn from ip_vs_conn_tab. - * returns bool success. - */ -static inline int ip_vs_conn_unhash(struct ip_vs_conn *cp) -{ - unsigned hash; - int ret; - - /* unhash it and decrease its reference counter */ - hash = ip_vs_conn_hashkey(cp->protocol, cp->caddr, cp->cport); - - ct_write_lock(hash); - - if (cp->flags & IP_VS_CONN_F_HASHED) { - list_del(&cp->c_list); - cp->flags &= ~IP_VS_CONN_F_HASHED; - atomic_dec(&cp->refcnt); - ret = 1; - } else - ret = 0; - - ct_write_unlock(hash); - - return ret; -} - - -/* - * Gets ip_vs_conn associated with supplied parameters in the ip_vs_conn_tab. - * Called for pkts coming from OUTside-to-INside. - * s_addr, s_port: pkt source address (foreign host) - * d_addr, d_port: pkt dest address (load balancer) - */ -static inline struct ip_vs_conn *__ip_vs_conn_in_get -(int protocol, __be32 s_addr, __be16 s_port, __be32 d_addr, __be16 d_port) -{ - unsigned hash; - struct ip_vs_conn *cp; - - hash = ip_vs_conn_hashkey(protocol, s_addr, s_port); - - ct_read_lock(hash); - - list_for_each_entry(cp, &ip_vs_conn_tab[hash], c_list) { - if (s_addr==cp->caddr && s_port==cp->cport && - d_port==cp->vport && d_addr==cp->vaddr && - ((!s_port) ^ (!(cp->flags & IP_VS_CONN_F_NO_CPORT))) && - protocol==cp->protocol) { - /* HIT */ - atomic_inc(&cp->refcnt); - ct_read_unlock(hash); - return cp; - } - } - - ct_read_unlock(hash); - - return NULL; -} - -struct ip_vs_conn *ip_vs_conn_in_get -(int protocol, __be32 s_addr, __be16 s_port, __be32 d_addr, __be16 d_port) -{ - struct ip_vs_conn *cp; - - cp = __ip_vs_conn_in_get(protocol, s_addr, s_port, d_addr, d_port); - if (!cp && atomic_read(&ip_vs_conn_no_cport_cnt)) - cp = __ip_vs_conn_in_get(protocol, s_addr, 0, d_addr, d_port); - - IP_VS_DBG(9, "lookup/in %s %u.%u.%u.%u:%d->%u.%u.%u.%u:%d %s\n", - ip_vs_proto_name(protocol), - NIPQUAD(s_addr), ntohs(s_port), - NIPQUAD(d_addr), ntohs(d_port), - cp?"hit":"not hit"); - - return cp; -} - -/* Get reference to connection template */ -struct ip_vs_conn *ip_vs_ct_in_get -(int protocol, __be32 s_addr, __be16 s_port, __be32 d_addr, __be16 d_port) -{ - unsigned hash; - struct ip_vs_conn *cp; - - hash = ip_vs_conn_hashkey(protocol, s_addr, s_port); - - ct_read_lock(hash); - - list_for_each_entry(cp, &ip_vs_conn_tab[hash], c_list) { - if (s_addr==cp->caddr && s_port==cp->cport && - d_port==cp->vport && d_addr==cp->vaddr && - cp->flags & IP_VS_CONN_F_TEMPLATE && - protocol==cp->protocol) { - /* HIT */ - atomic_inc(&cp->refcnt); - goto out; - } - } - cp = NULL; - - out: - ct_read_unlock(hash); - - IP_VS_DBG(9, "template lookup/in %s %u.%u.%u.%u:%d->%u.%u.%u.%u:%d %s\n", - ip_vs_proto_name(protocol), - NIPQUAD(s_addr), ntohs(s_port), - NIPQUAD(d_addr), ntohs(d_port), - cp?"hit":"not hit"); - - return cp; -} - -/* - * Gets ip_vs_conn associated with supplied parameters in the ip_vs_conn_tab. - * Called for pkts coming from inside-to-OUTside. - * s_addr, s_port: pkt source address (inside host) - * d_addr, d_port: pkt dest address (foreign host) - */ -struct ip_vs_conn *ip_vs_conn_out_get -(int protocol, __be32 s_addr, __be16 s_port, __be32 d_addr, __be16 d_port) -{ - unsigned hash; - struct ip_vs_conn *cp, *ret=NULL; - - /* - * Check for "full" addressed entries - */ - hash = ip_vs_conn_hashkey(protocol, d_addr, d_port); - - ct_read_lock(hash); - - list_for_each_entry(cp, &ip_vs_conn_tab[hash], c_list) { - if (d_addr == cp->caddr && d_port == cp->cport && - s_port == cp->dport && s_addr == cp->daddr && - protocol == cp->protocol) { - /* HIT */ - atomic_inc(&cp->refcnt); - ret = cp; - break; - } - } - - ct_read_unlock(hash); - - IP_VS_DBG(9, "lookup/out %s %u.%u.%u.%u:%d->%u.%u.%u.%u:%d %s\n", - ip_vs_proto_name(protocol), - NIPQUAD(s_addr), ntohs(s_port), - NIPQUAD(d_addr), ntohs(d_port), - ret?"hit":"not hit"); - - return ret; -} - - -/* - * Put back the conn and restart its timer with its timeout - */ -void ip_vs_conn_put(struct ip_vs_conn *cp) -{ - /* reset it expire in its timeout */ - mod_timer(&cp->timer, jiffies+cp->timeout); - - __ip_vs_conn_put(cp); -} - - -/* - * Fill a no_client_port connection with a client port number - */ -void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport) -{ - if (ip_vs_conn_unhash(cp)) { - spin_lock(&cp->lock); - if (cp->flags & IP_VS_CONN_F_NO_CPORT) { - atomic_dec(&ip_vs_conn_no_cport_cnt); - cp->flags &= ~IP_VS_CONN_F_NO_CPORT; - cp->cport = cport; - } - spin_unlock(&cp->lock); - - /* hash on new dport */ - ip_vs_conn_hash(cp); - } -} - - -/* - * Bind a connection entry with the corresponding packet_xmit. - * Called by ip_vs_conn_new. - */ -static inline void ip_vs_bind_xmit(struct ip_vs_conn *cp) -{ - switch (IP_VS_FWD_METHOD(cp)) { - case IP_VS_CONN_F_MASQ: - cp->packet_xmit = ip_vs_nat_xmit; - break; - - case IP_VS_CONN_F_TUNNEL: - cp->packet_xmit = ip_vs_tunnel_xmit; - break; - - case IP_VS_CONN_F_DROUTE: - cp->packet_xmit = ip_vs_dr_xmit; - break; - - case IP_VS_CONN_F_LOCALNODE: - cp->packet_xmit = ip_vs_null_xmit; - break; - - case IP_VS_CONN_F_BYPASS: - cp->packet_xmit = ip_vs_bypass_xmit; - break; - } -} - - -static inline int ip_vs_dest_totalconns(struct ip_vs_dest *dest) -{ - return atomic_read(&dest->activeconns) - + atomic_read(&dest->inactconns); -} - -/* - * Bind a connection entry with a virtual service destination - * Called just after a new connection entry is created. - */ -static inline void -ip_vs_bind_dest(struct ip_vs_conn *cp, struct ip_vs_dest *dest) -{ - /* if dest is NULL, then return directly */ - if (!dest) - return; - - /* Increase the refcnt counter of the dest */ - atomic_inc(&dest->refcnt); - - /* Bind with the destination and its corresponding transmitter */ - if ((cp->flags & IP_VS_CONN_F_SYNC) && - (!(cp->flags & IP_VS_CONN_F_TEMPLATE))) - /* if the connection is not template and is created - * by sync, preserve the activity flag. - */ - cp->flags |= atomic_read(&dest->conn_flags) & - (~IP_VS_CONN_F_INACTIVE); - else - cp->flags |= atomic_read(&dest->conn_flags); - cp->dest = dest; - - IP_VS_DBG(7, "Bind-dest %s c:%u.%u.%u.%u:%d v:%u.%u.%u.%u:%d " - "d:%u.%u.%u.%u:%d fwd:%c s:%u conn->flags:%X conn->refcnt:%d " - "dest->refcnt:%d\n", - ip_vs_proto_name(cp->protocol), - NIPQUAD(cp->caddr), ntohs(cp->cport), - NIPQUAD(cp->vaddr), ntohs(cp->vport), - NIPQUAD(cp->daddr), ntohs(cp->dport), - ip_vs_fwd_tag(cp), cp->state, - cp->flags, atomic_read(&cp->refcnt), - atomic_read(&dest->refcnt)); - - /* Update the connection counters */ - if (!(cp->flags & IP_VS_CONN_F_TEMPLATE)) { - /* It is a normal connection, so increase the inactive - connection counter because it is in TCP SYNRECV - state (inactive) or other protocol inacive state */ - if ((cp->flags & IP_VS_CONN_F_SYNC) && - (!(cp->flags & IP_VS_CONN_F_INACTIVE))) - atomic_inc(&dest->activeconns); - else - atomic_inc(&dest->inactconns); - } else { - /* It is a persistent connection/template, so increase - the peristent connection counter */ - atomic_inc(&dest->persistconns); - } - - if (dest->u_threshold != 0 && - ip_vs_dest_totalconns(dest) >= dest->u_threshold) - dest->flags |= IP_VS_DEST_F_OVERLOAD; -} - - -/* - * Check if there is a destination for the connection, if so - * bind the connection to the destination. - */ -struct ip_vs_dest *ip_vs_try_bind_dest(struct ip_vs_conn *cp) -{ - struct ip_vs_dest *dest; - - if ((cp) && (!cp->dest)) { - dest = ip_vs_find_dest(cp->daddr, cp->dport, - cp->vaddr, cp->vport, cp->protocol); - ip_vs_bind_dest(cp, dest); - return dest; - } else - return NULL; -} - - -/* - * Unbind a connection entry with its VS destination - * Called by the ip_vs_conn_expire function. - */ -static inline void ip_vs_unbind_dest(struct ip_vs_conn *cp) -{ - struct ip_vs_dest *dest = cp->dest; - - if (!dest) - return; - - IP_VS_DBG(7, "Unbind-dest %s c:%u.%u.%u.%u:%d v:%u.%u.%u.%u:%d " - "d:%u.%u.%u.%u:%d fwd:%c s:%u conn->flags:%X conn->refcnt:%d " - "dest->refcnt:%d\n", - ip_vs_proto_name(cp->protocol), - NIPQUAD(cp->caddr), ntohs(cp->cport), - NIPQUAD(cp->vaddr), ntohs(cp->vport), - NIPQUAD(cp->daddr), ntohs(cp->dport), - ip_vs_fwd_tag(cp), cp->state, - cp->flags, atomic_read(&cp->refcnt), - atomic_read(&dest->refcnt)); - - /* Update the connection counters */ - if (!(cp->flags & IP_VS_CONN_F_TEMPLATE)) { - /* It is a normal connection, so decrease the inactconns - or activeconns counter */ - if (cp->flags & IP_VS_CONN_F_INACTIVE) { - atomic_dec(&dest->inactconns); - } else { - atomic_dec(&dest->activeconns); - } - } else { - /* It is a persistent connection/template, so decrease - the peristent connection counter */ - atomic_dec(&dest->persistconns); - } - - if (dest->l_threshold != 0) { - if (ip_vs_dest_totalconns(dest) < dest->l_threshold) - dest->flags &= ~IP_VS_DEST_F_OVERLOAD; - } else if (dest->u_threshold != 0) { - if (ip_vs_dest_totalconns(dest) * 4 < dest->u_threshold * 3) - dest->flags &= ~IP_VS_DEST_F_OVERLOAD; - } else { - if (dest->flags & IP_VS_DEST_F_OVERLOAD) - dest->flags &= ~IP_VS_DEST_F_OVERLOAD; - } - - /* - * Simply decrease the refcnt of the dest, because the - * dest will be either in service's destination list - * or in the trash. - */ - atomic_dec(&dest->refcnt); -} - - -/* - * Checking if the destination of a connection template is available. - * If available, return 1, otherwise invalidate this connection - * template and return 0. - */ -int ip_vs_check_template(struct ip_vs_conn *ct) -{ - struct ip_vs_dest *dest = ct->dest; - - /* - * Checking the dest server status. - */ - if ((dest == NULL) || - !(dest->flags & IP_VS_DEST_F_AVAILABLE) || - (sysctl_ip_vs_expire_quiescent_template && - (atomic_read(&dest->weight) == 0))) { - IP_VS_DBG(9, "check_template: dest not available for " - "protocol %s s:%u.%u.%u.%u:%d v:%u.%u.%u.%u:%d " - "-> d:%u.%u.%u.%u:%d\n", - ip_vs_proto_name(ct->protocol), - NIPQUAD(ct->caddr), ntohs(ct->cport), - NIPQUAD(ct->vaddr), ntohs(ct->vport), - NIPQUAD(ct->daddr), ntohs(ct->dport)); - - /* - * Invalidate the connection template - */ - if (ct->vport != htons(0xffff)) { - if (ip_vs_conn_unhash(ct)) { - ct->dport = htons(0xffff); - ct->vport = htons(0xffff); - ct->cport = 0; - ip_vs_conn_hash(ct); - } - } - - /* - * Simply decrease the refcnt of the template, - * don't restart its timer. - */ - atomic_dec(&ct->refcnt); - return 0; - } - return 1; -} - -static void ip_vs_conn_expire(unsigned long data) -{ - struct ip_vs_conn *cp = (struct ip_vs_conn *)data; - - cp->timeout = 60*HZ; - - /* - * hey, I'm using it - */ - atomic_inc(&cp->refcnt); - - /* - * do I control anybody? - */ - if (atomic_read(&cp->n_control)) - goto expire_later; - - /* - * unhash it if it is hashed in the conn table - */ - if (!ip_vs_conn_unhash(cp)) - goto expire_later; - - /* - * refcnt==1 implies I'm the only one referrer - */ - if (likely(atomic_read(&cp->refcnt) == 1)) { - /* delete the timer if it is activated by other users */ - if (timer_pending(&cp->timer)) - del_timer(&cp->timer); - - /* does anybody control me? */ - if (cp->control) - ip_vs_control_del(cp); - - if (unlikely(cp->app != NULL)) - ip_vs_unbind_app(cp); - ip_vs_unbind_dest(cp); - if (cp->flags & IP_VS_CONN_F_NO_CPORT) - atomic_dec(&ip_vs_conn_no_cport_cnt); - atomic_dec(&ip_vs_conn_count); - - kmem_cache_free(ip_vs_conn_cachep, cp); - return; - } - - /* hash it back to the table */ - ip_vs_conn_hash(cp); - - expire_later: - IP_VS_DBG(7, "delayed: conn->refcnt-1=%d conn->n_control=%d\n", - atomic_read(&cp->refcnt)-1, - atomic_read(&cp->n_control)); - - ip_vs_conn_put(cp); -} - - -void ip_vs_conn_expire_now(struct ip_vs_conn *cp) -{ - if (del_timer(&cp->timer)) - mod_timer(&cp->timer, jiffies); -} - - -/* - * Create a new connection entry and hash it into the ip_vs_conn_tab - */ -struct ip_vs_conn * -ip_vs_conn_new(int proto, __be32 caddr, __be16 cport, __be32 vaddr, __be16 vport, - __be32 daddr, __be16 dport, unsigned flags, - struct ip_vs_dest *dest) -{ - struct ip_vs_conn *cp; - struct ip_vs_protocol *pp = ip_vs_proto_get(proto); - - cp = kmem_cache_zalloc(ip_vs_conn_cachep, GFP_ATOMIC); - if (cp == NULL) { - IP_VS_ERR_RL("ip_vs_conn_new: no memory available.\n"); - return NULL; - } - - INIT_LIST_HEAD(&cp->c_list); - setup_timer(&cp->timer, ip_vs_conn_expire, (unsigned long)cp); - cp->protocol = proto; - cp->caddr = caddr; - cp->cport = cport; - cp->vaddr = vaddr; - cp->vport = vport; - cp->daddr = daddr; - cp->dport = dport; - cp->flags = flags; - spin_lock_init(&cp->lock); - - /* - * Set the entry is referenced by the current thread before hashing - * it in the table, so that other thread run ip_vs_random_dropentry - * but cannot drop this entry. - */ - atomic_set(&cp->refcnt, 1); - - atomic_set(&cp->n_control, 0); - atomic_set(&cp->in_pkts, 0); - - atomic_inc(&ip_vs_conn_count); - if (flags & IP_VS_CONN_F_NO_CPORT) - atomic_inc(&ip_vs_conn_no_cport_cnt); - - /* Bind the connection with a destination server */ - ip_vs_bind_dest(cp, dest); - - /* Set its state and timeout */ - cp->state = 0; - cp->timeout = 3*HZ; - - /* Bind its packet transmitter */ - ip_vs_bind_xmit(cp); - - if (unlikely(pp && atomic_read(&pp->appcnt))) - ip_vs_bind_app(cp, pp); - - /* Hash it in the ip_vs_conn_tab finally */ - ip_vs_conn_hash(cp); - - return cp; -} - - -/* - * /proc/net/ip_vs_conn entries - */ -#ifdef CONFIG_PROC_FS - -static void *ip_vs_conn_array(struct seq_file *seq, loff_t pos) -{ - int idx; - struct ip_vs_conn *cp; - - for(idx = 0; idx < IP_VS_CONN_TAB_SIZE; idx++) { - ct_read_lock_bh(idx); - list_for_each_entry(cp, &ip_vs_conn_tab[idx], c_list) { - if (pos-- == 0) { - seq->private = &ip_vs_conn_tab[idx]; - return cp; - } - } - ct_read_unlock_bh(idx); - } - - return NULL; -} - -static void *ip_vs_conn_seq_start(struct seq_file *seq, loff_t *pos) -{ - seq->private = NULL; - return *pos ? ip_vs_conn_array(seq, *pos - 1) :SEQ_START_TOKEN; -} - -static void *ip_vs_conn_seq_next(struct seq_file *seq, void *v, loff_t *pos) -{ - struct ip_vs_conn *cp = v; - struct list_head *e, *l = seq->private; - int idx; - - ++*pos; - if (v == SEQ_START_TOKEN) - return ip_vs_conn_array(seq, 0); - - /* more on same hash chain? */ - if ((e = cp->c_list.next) != l) - return list_entry(e, struct ip_vs_conn, c_list); - - idx = l - ip_vs_conn_tab; - ct_read_unlock_bh(idx); - - while (++idx < IP_VS_CONN_TAB_SIZE) { - ct_read_lock_bh(idx); - list_for_each_entry(cp, &ip_vs_conn_tab[idx], c_list) { - seq->private = &ip_vs_conn_tab[idx]; - return cp; - } - ct_read_unlock_bh(idx); - } - seq->private = NULL; - return NULL; -} - -static void ip_vs_conn_seq_stop(struct seq_file *seq, void *v) -{ - struct list_head *l = seq->private; - - if (l) - ct_read_unlock_bh(l - ip_vs_conn_tab); -} - -static int ip_vs_conn_seq_show(struct seq_file *seq, void *v) -{ - - if (v == SEQ_START_TOKEN) - seq_puts(seq, - "Pro FromIP FPrt ToIP TPrt DestIP DPrt State Expires\n"); - else { - const struct ip_vs_conn *cp = v; - - seq_printf(seq, - "%-3s %08X %04X %08X %04X %08X %04X %-11s %7lu\n", - ip_vs_proto_name(cp->protocol), - ntohl(cp->caddr), ntohs(cp->cport), - ntohl(cp->vaddr), ntohs(cp->vport), - ntohl(cp->daddr), ntohs(cp->dport), - ip_vs_state_name(cp->protocol, cp->state), - (cp->timer.expires-jiffies)/HZ); - } - return 0; -} - -static const struct seq_operations ip_vs_conn_seq_ops = { - .start = ip_vs_conn_seq_start, - .next = ip_vs_conn_seq_next, - .stop = ip_vs_conn_seq_stop, - .show = ip_vs_conn_seq_show, -}; - -static int ip_vs_conn_open(struct inode *inode, struct file *file) -{ - return seq_open(file, &ip_vs_conn_seq_ops); -} - -static const struct file_operations ip_vs_conn_fops = { - .owner = THIS_MODULE, - .open = ip_vs_conn_open, - .read = seq_read, - .llseek = seq_lseek, - .release = seq_release, -}; - -static const char *ip_vs_origin_name(unsigned flags) -{ - if (flags & IP_VS_CONN_F_SYNC) - return "SYNC"; - else - return "LOCAL"; -} - -static int ip_vs_conn_sync_seq_show(struct seq_file *seq, void *v) -{ - - if (v == SEQ_START_TOKEN) - seq_puts(seq, - "Pro FromIP FPrt ToIP TPrt DestIP DPrt State Origin Expires\n"); - else { - const struct ip_vs_conn *cp = v; - - seq_printf(seq, - "%-3s %08X %04X %08X %04X %08X %04X %-11s %-6s %7lu\n", - ip_vs_proto_name(cp->protocol), - ntohl(cp->caddr), ntohs(cp->cport), - ntohl(cp->vaddr), ntohs(cp->vport), - ntohl(cp->daddr), ntohs(cp->dport), - ip_vs_state_name(cp->protocol, cp->state), - ip_vs_origin_name(cp->flags), - (cp->timer.expires-jiffies)/HZ); - } - return 0; -} - -static const struct seq_operations ip_vs_conn_sync_seq_ops = { - .start = ip_vs_conn_seq_start, - .next = ip_vs_conn_seq_next, - .stop = ip_vs_conn_seq_stop, - .show = ip_vs_conn_sync_seq_show, -}; - -static int ip_vs_conn_sync_open(struct inode *inode, struct file *file) -{ - return seq_open(file, &ip_vs_conn_sync_seq_ops); -} - -static const struct file_operations ip_vs_conn_sync_fops = { - .owner = THIS_MODULE, - .open = ip_vs_conn_sync_open, - .read = seq_read, - .llseek = seq_lseek, - .release = seq_release, -}; - -#endif - - -/* - * Randomly drop connection entries before running out of memory - */ -static inline int todrop_entry(struct ip_vs_conn *cp) -{ - /* - * The drop rate array needs tuning for real environments. - * Called from timer bh only => no locking - */ - static const char todrop_rate[9] = {0, 1, 2, 3, 4, 5, 6, 7, 8}; - static char todrop_counter[9] = {0}; - int i; - - /* if the conn entry hasn't lasted for 60 seconds, don't drop it. - This will leave enough time for normal connection to get - through. */ - if (time_before(cp->timeout + jiffies, cp->timer.expires + 60*HZ)) - return 0; - - /* Don't drop the entry if its number of incoming packets is not - located in [0, 8] */ - i = atomic_read(&cp->in_pkts); - if (i > 8 || i < 0) return 0; - - if (!todrop_rate[i]) return 0; - if (--todrop_counter[i] > 0) return 0; - - todrop_counter[i] = todrop_rate[i]; - return 1; -} - -/* Called from keventd and must protect itself from softirqs */ -void ip_vs_random_dropentry(void) -{ - int idx; - struct ip_vs_conn *cp; - - /* - * Randomly scan 1/32 of the whole table every second - */ - for (idx = 0; idx < (IP_VS_CONN_TAB_SIZE>>5); idx++) { - unsigned hash = net_random() & IP_VS_CONN_TAB_MASK; - - /* - * Lock is actually needed in this loop. - */ - ct_write_lock_bh(hash); - - list_for_each_entry(cp, &ip_vs_conn_tab[hash], c_list) { - if (cp->flags & IP_VS_CONN_F_TEMPLATE) - /* connection template */ - continue; - - if (cp->protocol == IPPROTO_TCP) { - switch(cp->state) { - case IP_VS_TCP_S_SYN_RECV: - case IP_VS_TCP_S_SYNACK: - break; - - case IP_VS_TCP_S_ESTABLISHED: - if (todrop_entry(cp)) - break; - continue; - - default: - continue; - } - } else { - if (!todrop_entry(cp)) - continue; - } - - IP_VS_DBG(4, "del connection\n"); - ip_vs_conn_expire_now(cp); - if (cp->control) { - IP_VS_DBG(4, "del conn template\n"); - ip_vs_conn_expire_now(cp->control); - } - } - ct_write_unlock_bh(hash); - } -} - - -/* - * Flush all the connection entries in the ip_vs_conn_tab - */ -static void ip_vs_conn_flush(void) -{ - int idx; - struct ip_vs_conn *cp; - - flush_again: - for (idx=0; idx<IP_VS_CONN_TAB_SIZE; idx++) { - /* - * Lock is actually needed in this loop. - */ - ct_write_lock_bh(idx); - - list_for_each_entry(cp, &ip_vs_conn_tab[idx], c_list) { - - IP_VS_DBG(4, "del connection\n"); - ip_vs_conn_expire_now(cp); - if (cp->control) { - IP_VS_DBG(4, "del conn template\n"); - ip_vs_conn_expire_now(cp->control); - } - } - ct_write_unlock_bh(idx); - } - - /* the counter may be not NULL, because maybe some conn entries - are run by slow timer handler or unhashed but still referred */ - if (atomic_read(&ip_vs_conn_count) != 0) { - schedule(); - goto flush_again; - } -} - - -int __init ip_vs_conn_init(void) -{ - int idx; - - /* - * Allocate the connection hash table and initialize its list heads - */ - ip_vs_conn_tab = vmalloc(IP_VS_CONN_TAB_SIZE*sizeof(struct list_head)); - if (!ip_vs_conn_tab) - return -ENOMEM; - - /* Allocate ip_vs_conn slab cache */ - ip_vs_conn_cachep = kmem_cache_create("ip_vs_conn", - sizeof(struct ip_vs_conn), 0, - SLAB_HWCACHE_ALIGN, NULL); - if (!ip_vs_conn_cachep) { - vfree(ip_vs_conn_tab); - return -ENOMEM; - } - - IP_VS_INFO("Connection hash table configured " - "(size=%d, memory=%ldKbytes)\n", - IP_VS_CONN_TAB_SIZE, - (long)(IP_VS_CONN_TAB_SIZE*sizeof(struct list_head))/1024); - IP_VS_DBG(0, "Each connection entry needs %Zd bytes at least\n", - sizeof(struct ip_vs_conn)); - - for (idx = 0; idx < IP_VS_CONN_TAB_SIZE; idx++) { - INIT_LIST_HEAD(&ip_vs_conn_tab[idx]); - } - - for (idx = 0; idx < CT_LOCKARRAY_SIZE; idx++) { - rwlock_init(&__ip_vs_conntbl_lock_array[idx].l); - } - - proc_net_fops_create(&init_net, "ip_vs_conn", 0, &ip_vs_conn_fops); - proc_net_fops_create(&init_net, "ip_vs_conn_sync", 0, &ip_vs_conn_sync_fops); - - /* calculate the random value for connection hash */ - get_random_bytes(&ip_vs_conn_rnd, sizeof(ip_vs_conn_rnd)); - - return 0; -} - - -void ip_vs_conn_cleanup(void) -{ - /* flush all the connection entries first */ - ip_vs_conn_flush(); - - /* Release the empty cache */ - kmem_cache_destroy(ip_vs_conn_cachep); - proc_net_remove(&init_net, "ip_vs_conn"); - proc_net_remove(&init_net, "ip_vs_conn_sync"); - vfree(ip_vs_conn_tab); -} |