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https://github.com/torvalds/linux
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8feaf0c0a5
This paves the way to generalise the rest of the sock ID lookup routines and saves some bytes in TCPv4 TIME_WAIT sockets on distro kernels (where IPv6 is always built as a module): [root@qemu ~]# grep tw_sock /proc/slabinfo tw_sock_TCPv6 0 0 128 31 1 tw_sock_TCP 0 0 96 41 1 [root@qemu ~]# Now if a protocol wants to use the TIME_WAIT generic infrastructure it only has to set the sk_prot->twsk_obj_size field with the size of its inet_timewait_sock derived sock and proto_register will create sk_prot->twsk_slab, for now its only for INET sockets, but we can introduce timewait_sock later if some non INET transport protocolo wants to use this stuff. Next changesets will take advantage of this new infrastructure to generalise even more TCP code. [acme@toy net-2.6.14]$ grep built-in /tmp/before.size /tmp/after.size /tmp/before.size: 188646 11764 5068 205478 322a6 net/ipv4/built-in.o /tmp/after.size: 188144 11764 5068 204976 320b0 net/ipv4/built-in.o [acme@toy net-2.6.14]$ Tested with both IPv4 & IPv6 (::1 (localhost) & ::ffff:172.20.0.1 (qemu host)). Signed-off-by: Arnaldo Carvalho de Melo <acme@ghostprotocols.net> Signed-off-by: David S. Miller <davem@davemloft.net>
143 lines
3.9 KiB
C
143 lines
3.9 KiB
C
/*
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* INET An implementation of the TCP/IP protocol suite for the LINUX
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* operating system. INET is implemented using the BSD Socket
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* interface as the means of communication with the user level.
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*
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* Definitions for a generic INET TIMEWAIT sock
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*
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* From code originally in net/tcp.h
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#ifndef _INET_TIMEWAIT_SOCK_
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#define _INET_TIMEWAIT_SOCK_
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#include <linux/config.h>
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#include <linux/list.h>
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#include <linux/types.h>
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#include <net/sock.h>
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#include <net/tcp_states.h>
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#include <asm/atomic.h>
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#if (BITS_PER_LONG == 64)
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#define INET_TIMEWAIT_ADDRCMP_ALIGN_BYTES 8
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#else
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#define INET_TIMEWAIT_ADDRCMP_ALIGN_BYTES 4
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#endif
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struct inet_bind_bucket;
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/*
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* This is a TIME_WAIT sock. It works around the memory consumption
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* problems of sockets in such a state on heavily loaded servers, but
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* without violating the protocol specification.
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*/
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struct inet_timewait_sock {
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/*
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* Now struct sock also uses sock_common, so please just
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* don't add nothing before this first member (__tw_common) --acme
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*/
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struct sock_common __tw_common;
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#define tw_family __tw_common.skc_family
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#define tw_state __tw_common.skc_state
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#define tw_reuse __tw_common.skc_reuse
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#define tw_bound_dev_if __tw_common.skc_bound_dev_if
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#define tw_node __tw_common.skc_node
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#define tw_bind_node __tw_common.skc_bind_node
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#define tw_refcnt __tw_common.skc_refcnt
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#define tw_prot __tw_common.skc_prot
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volatile unsigned char tw_substate;
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/* 3 bits hole, try to pack */
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unsigned char tw_rcv_wscale;
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/* Socket demultiplex comparisons on incoming packets. */
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/* these five are in inet_sock */
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__u16 tw_sport;
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__u32 tw_daddr __attribute__((aligned(INET_TIMEWAIT_ADDRCMP_ALIGN_BYTES)));
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__u32 tw_rcv_saddr;
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__u16 tw_dport;
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__u16 tw_num;
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/* And these are ours. */
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__u8 tw_ipv6only:1;
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/* 31 bits hole, try to pack */
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int tw_hashent;
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int tw_timeout;
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unsigned long tw_ttd;
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struct inet_bind_bucket *tw_tb;
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struct hlist_node tw_death_node;
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};
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static inline void inet_twsk_add_node(struct inet_timewait_sock *tw,
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struct hlist_head *list)
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{
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hlist_add_head(&tw->tw_node, list);
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}
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static inline void inet_twsk_add_bind_node(struct inet_timewait_sock *tw,
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struct hlist_head *list)
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{
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hlist_add_head(&tw->tw_bind_node, list);
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}
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static inline int inet_twsk_dead_hashed(const struct inet_timewait_sock *tw)
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{
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return tw->tw_death_node.pprev != NULL;
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}
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static inline void inet_twsk_dead_node_init(struct inet_timewait_sock *tw)
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{
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tw->tw_death_node.pprev = NULL;
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}
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static inline void __inet_twsk_del_dead_node(struct inet_timewait_sock *tw)
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{
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__hlist_del(&tw->tw_death_node);
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inet_twsk_dead_node_init(tw);
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}
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static inline int inet_twsk_del_dead_node(struct inet_timewait_sock *tw)
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{
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if (inet_twsk_dead_hashed(tw)) {
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__inet_twsk_del_dead_node(tw);
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return 1;
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}
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return 0;
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}
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#define inet_twsk_for_each(tw, node, head) \
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hlist_for_each_entry(tw, node, head, tw_node)
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#define inet_twsk_for_each_inmate(tw, node, jail) \
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hlist_for_each_entry(tw, node, jail, tw_death_node)
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#define inet_twsk_for_each_inmate_safe(tw, node, safe, jail) \
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hlist_for_each_entry_safe(tw, node, safe, jail, tw_death_node)
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static inline struct inet_timewait_sock *inet_twsk(const struct sock *sk)
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{
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return (struct inet_timewait_sock *)sk;
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}
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static inline u32 inet_rcv_saddr(const struct sock *sk)
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{
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return likely(sk->sk_state != TCP_TIME_WAIT) ?
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inet_sk(sk)->rcv_saddr : inet_twsk(sk)->tw_rcv_saddr;
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}
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static inline void inet_twsk_put(struct inet_timewait_sock *tw)
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{
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if (atomic_dec_and_test(&tw->tw_refcnt)) {
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#ifdef SOCK_REFCNT_DEBUG
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printk(KERN_DEBUG "%s timewait_sock %p released\n",
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tw->tw_prot->name, tw);
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#endif
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kmem_cache_free(tw->tw_prot->twsk_slab, tw);
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}
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}
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#endif /* _INET_TIMEWAIT_SOCK_ */
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