--- /dev/null
+/*
+ * INET An implementation of the TCP/IP protocol suite for the LINUX
+ * operating system. INET is implemented using the BSD Socket
+ * interface as the means of communication with the user level.
+ *
+ * Definitions for a generic INET TIMEWAIT sock
+ *
+ * From code originally in net/tcp.h
+ *
+ * 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.
+ */
+#ifndef _INET_TIMEWAIT_SOCK_
+#define _INET_TIMEWAIT_SOCK_
+
+#include <linux/config.h>
+
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/timer.h>
+#include <linux/types.h>
+#include <linux/workqueue.h>
+
+#include <net/inet_sock.h>
+#include <net/sock.h>
+#include <net/tcp_states.h>
+#include <net/timewait_sock.h>
+
+#include <asm/atomic.h>
+
+struct inet_hashinfo;
+
+#define INET_TWDR_RECYCLE_SLOTS_LOG 5
+#define INET_TWDR_RECYCLE_SLOTS (1 << INET_TWDR_RECYCLE_SLOTS_LOG)
+
+/*
+ * If time > 4sec, it is "slow" path, no recycling is required,
+ * so that we select tick to get range about 4 seconds.
+ */
+#if HZ <= 16 || HZ > 4096
+# error Unsupported: HZ <= 16 or HZ > 4096
+#elif HZ <= 32
+# define INET_TWDR_RECYCLE_TICK (5 + 2 - INET_TWDR_RECYCLE_SLOTS_LOG)
+#elif HZ <= 64
+# define INET_TWDR_RECYCLE_TICK (6 + 2 - INET_TWDR_RECYCLE_SLOTS_LOG)
+#elif HZ <= 128
+# define INET_TWDR_RECYCLE_TICK (7 + 2 - INET_TWDR_RECYCLE_SLOTS_LOG)
+#elif HZ <= 256
+# define INET_TWDR_RECYCLE_TICK (8 + 2 - INET_TWDR_RECYCLE_SLOTS_LOG)
+#elif HZ <= 512
+# define INET_TWDR_RECYCLE_TICK (9 + 2 - INET_TWDR_RECYCLE_SLOTS_LOG)
+#elif HZ <= 1024
+# define INET_TWDR_RECYCLE_TICK (10 + 2 - INET_TWDR_RECYCLE_SLOTS_LOG)
+#elif HZ <= 2048
+# define INET_TWDR_RECYCLE_TICK (11 + 2 - INET_TWDR_RECYCLE_SLOTS_LOG)
+#else
+# define INET_TWDR_RECYCLE_TICK (12 + 2 - INET_TWDR_RECYCLE_SLOTS_LOG)
+#endif
+
+/* TIME_WAIT reaping mechanism. */
+#define INET_TWDR_TWKILL_SLOTS 8 /* Please keep this a power of 2. */
+
+#define INET_TWDR_TWKILL_QUOTA 100
+
+struct inet_timewait_death_row {
+ /* Short-time timewait calendar */
+ int twcal_hand;
+ int twcal_jiffie;
+ struct timer_list twcal_timer;
+ struct hlist_head twcal_row[INET_TWDR_RECYCLE_SLOTS];
+
+ spinlock_t death_lock;
+ int tw_count;
+ int period;
+ u32 thread_slots;
+ struct work_struct twkill_work;
+ struct timer_list tw_timer;
+ int slot;
+ struct hlist_head cells[INET_TWDR_TWKILL_SLOTS];
+ struct inet_hashinfo *hashinfo;
+ int sysctl_tw_recycle;
+ int sysctl_max_tw_buckets;
+};
+
+extern void inet_twdr_hangman(unsigned long data);
+extern void inet_twdr_twkill_work(void *data);
+extern void inet_twdr_twcal_tick(unsigned long data);
+
+#if (BITS_PER_LONG == 64)
+#define INET_TIMEWAIT_ADDRCMP_ALIGN_BYTES 8
+#else
+#define INET_TIMEWAIT_ADDRCMP_ALIGN_BYTES 4
+#endif
+
+struct inet_bind_bucket;
+
+/*
+ * This is a TIME_WAIT sock. It works around the memory consumption
+ * problems of sockets in such a state on heavily loaded servers, but
+ * without violating the protocol specification.
+ */
+struct inet_timewait_sock {
+ /*
+ * Now struct sock also uses sock_common, so please just
+ * don't add nothing before this first member (__tw_common) --acme
+ */
+ struct sock_common __tw_common;
+#define tw_family __tw_common.skc_family
+#define tw_state __tw_common.skc_state
+#define tw_reuse __tw_common.skc_reuse
+#define tw_bound_dev_if __tw_common.skc_bound_dev_if
+#define tw_node __tw_common.skc_node
+#define tw_bind_node __tw_common.skc_bind_node
+#define tw_refcnt __tw_common.skc_refcnt
+#define tw_hash __tw_common.skc_hash
+#define tw_prot __tw_common.skc_prot
+ volatile unsigned char tw_substate;
+ /* 3 bits hole, try to pack */
+ unsigned char tw_rcv_wscale;
+ /* Socket demultiplex comparisons on incoming packets. */
+ /* these five are in inet_sock */
+ __u16 tw_sport;
+ __u32 tw_daddr __attribute__((aligned(INET_TIMEWAIT_ADDRCMP_ALIGN_BYTES)));
+ __u32 tw_rcv_saddr;
+ __u16 tw_dport;
+ __u16 tw_num;
+ /* And these are ours. */
+ __u8 tw_ipv6only:1;
+ /* 15 bits hole, try to pack */
+ __u16 tw_ipv6_offset;
+ int tw_timeout;
+ unsigned long tw_ttd;
+ struct inet_bind_bucket *tw_tb;
+ struct hlist_node tw_death_node;
+};
+
+static inline void inet_twsk_add_node(struct inet_timewait_sock *tw,
+ struct hlist_head *list)
+{
+ hlist_add_head(&tw->tw_node, list);
+}
+
+static inline void inet_twsk_add_bind_node(struct inet_timewait_sock *tw,
+ struct hlist_head *list)
+{
+ hlist_add_head(&tw->tw_bind_node, list);
+}
+
+static inline int inet_twsk_dead_hashed(const struct inet_timewait_sock *tw)
+{
+ return !hlist_unhashed(&tw->tw_death_node);
+}
+
+static inline void inet_twsk_dead_node_init(struct inet_timewait_sock *tw)
+{
+ tw->tw_death_node.pprev = NULL;
+}
+
+static inline void __inet_twsk_del_dead_node(struct inet_timewait_sock *tw)
+{
+ __hlist_del(&tw->tw_death_node);
+ inet_twsk_dead_node_init(tw);
+}
+
+static inline int inet_twsk_del_dead_node(struct inet_timewait_sock *tw)
+{
+ if (inet_twsk_dead_hashed(tw)) {
+ __inet_twsk_del_dead_node(tw);
+ return 1;
+ }
+ return 0;
+}
+
+#define inet_twsk_for_each(tw, node, head) \
+ hlist_for_each_entry(tw, node, head, tw_node)
+
+#define inet_twsk_for_each_inmate(tw, node, jail) \
+ hlist_for_each_entry(tw, node, jail, tw_death_node)
+
+#define inet_twsk_for_each_inmate_safe(tw, node, safe, jail) \
+ hlist_for_each_entry_safe(tw, node, safe, jail, tw_death_node)
+
+static inline struct inet_timewait_sock *inet_twsk(const struct sock *sk)
+{
+ return (struct inet_timewait_sock *)sk;
+}
+
+static inline u32 inet_rcv_saddr(const struct sock *sk)
+{
+ return likely(sk->sk_state != TCP_TIME_WAIT) ?
+ inet_sk(sk)->rcv_saddr : inet_twsk(sk)->tw_rcv_saddr;
+}
+
+static inline void inet_twsk_put(struct inet_timewait_sock *tw)
+{
+ if (atomic_dec_and_test(&tw->tw_refcnt)) {
+ struct module *owner = tw->tw_prot->owner;
+#ifdef SOCK_REFCNT_DEBUG
+ printk(KERN_DEBUG "%s timewait_sock %p released\n",
+ tw->tw_prot->name, tw);
+#endif
+ kmem_cache_free(tw->tw_prot->twsk_prot->twsk_slab, tw);
+ module_put(owner);
+ }
+}
+
+extern struct inet_timewait_sock *inet_twsk_alloc(const struct sock *sk,
+ const int state);
+
+extern void __inet_twsk_kill(struct inet_timewait_sock *tw,
+ struct inet_hashinfo *hashinfo);
+
+extern void __inet_twsk_hashdance(struct inet_timewait_sock *tw,
+ struct sock *sk,
+ struct inet_hashinfo *hashinfo);
+
+extern void inet_twsk_schedule(struct inet_timewait_sock *tw,
+ struct inet_timewait_death_row *twdr,
+ const int timeo, const int timewait_len);
+extern void inet_twsk_deschedule(struct inet_timewait_sock *tw,
+ struct inet_timewait_death_row *twdr);
+#endif /* _INET_TIMEWAIT_SOCK_ */
git://git.onelab.eu / linux-2.6.git / blobdiff