#include <linux/slab.h>
#include <linux/cache.h>
#include <linux/percpu.h>
+#include <net/inet_hashtables.h>
#include <net/checksum.h>
#include <net/request_sock.h>
#include <net/sock.h>
#endif
#include <linux/seq_file.h>
-/* This is for all connections with a full identity, no wildcards.
- * New scheme, half the table is for TIME_WAIT, the other half is
- * for the rest. I'll experiment with dynamic table growth later.
- */
-struct inet_ehash_bucket {
- rwlock_t lock;
- struct hlist_head chain;
-} __attribute__((__aligned__(8)));
-
-/* This is for listening sockets, thus all sockets which possess wildcards. */
-#define INET_LHTABLE_SIZE 32 /* Yes, really, this is all you need. */
-
-/* There are a few simple rules, which allow for local port reuse by
- * an application. In essence:
- *
- * 1) Sockets bound to different interfaces may share a local port.
- * Failing that, goto test 2.
- * 2) If all sockets have sk->sk_reuse set, and none of them are in
- * TCP_LISTEN state, the port may be shared.
- * Failing that, goto test 3.
- * 3) If all sockets are bound to a specific inet_sk(sk)->rcv_saddr local
- * address, and none of them are the same, the port may be
- * shared.
- * Failing this, the port cannot be shared.
- *
- * The interesting point, is test #2. This is what an FTP server does
- * all day. To optimize this case we use a specific flag bit defined
- * below. As we add sockets to a bind bucket list, we perform a
- * check of: (newsk->sk_reuse && (newsk->sk_state != TCP_LISTEN))
- * As long as all sockets added to a bind bucket pass this test,
- * the flag bit will be set.
- * The resulting situation is that tcp_v[46]_verify_bind() can just check
- * for this flag bit, if it is set and the socket trying to bind has
- * sk->sk_reuse set, we don't even have to walk the owners list at all,
- * we return that it is ok to bind this socket to the requested local port.
- *
- * Sounds like a lot of work, but it is worth it. In a more naive
- * implementation (ie. current FreeBSD etc.) the entire list of ports
- * must be walked for each data port opened by an ftp server. Needless
- * to say, this does not scale at all. With a couple thousand FTP
- * users logged onto your box, isn't it nice to know that new data
- * ports are created in O(1) time? I thought so. ;-) -DaveM
- */
-struct inet_bind_bucket {
- unsigned short port;
- signed short fastreuse;
- struct hlist_node node;
- struct hlist_head owners;
-};
-
-#define inet_bind_bucket_for_each(tb, node, head) \
- hlist_for_each_entry(tb, node, head, node)
-
-struct inet_bind_hashbucket {
- spinlock_t lock;
- struct hlist_head chain;
-};
-
-struct inet_hashinfo {
- /* This is for sockets with full identity only. Sockets here will
- * always be without wildcards and will have the following invariant:
- *
- * TCP_ESTABLISHED <= sk->sk_state < TCP_CLOSE
- *
- * First half of the table is for sockets not in TIME_WAIT, second half
- * is for TIME_WAIT sockets only.
- */
- struct inet_ehash_bucket *ehash;
-
- /* Ok, let's try this, I give up, we do need a local binding
- * TCP hash as well as the others for fast bind/connect.
- */
- struct inet_bind_hashbucket *bhash;
-
- int bhash_size;
- int ehash_size;
-
- /* All sockets in TCP_LISTEN state will be in here. This is the only
- * table where wildcard'd TCP sockets can exist. Hash function here
- * is just local port number.
- */
- struct hlist_head listening_hash[INET_LHTABLE_SIZE];
-
- /* All the above members are written once at bootup and
- * never written again _or_ are predominantly read-access.
- *
- * Now align to a new cache line as all the following members
- * are often dirty.
- */
- rwlock_t lhash_lock ____cacheline_aligned;
- atomic_t lhash_users;
- wait_queue_head_t lhash_wait;
- spinlock_t portalloc_lock;
-};
-
extern struct inet_hashinfo tcp_hashinfo;
#define tcp_ehash (tcp_hashinfo.ehash)
#define tcp_bhash (tcp_hashinfo.bhash)
#define tcp_portalloc_lock (tcp_hashinfo.portalloc_lock)
extern kmem_cache_t *tcp_bucket_cachep;
-extern struct inet_bind_bucket *
- inet_bind_bucket_create(kmem_cache_t *cachep,
- struct inet_bind_hashbucket *head,
- const unsigned short snum);
-extern void inet_bind_bucket_destroy(kmem_cache_t *cachep,
- struct inet_bind_bucket *tb);
-extern int tcp_port_rover;
-/* These are AF independent. */
-static inline int inet_bhashfn(const __u16 lport, const int bhash_size)
-{
- return lport & (bhash_size - 1);
-}
+extern int tcp_port_rover;
extern void tcp_bind_hash(struct sock *sk, struct inet_bind_bucket *tb,
unsigned short snum);
ipv6_addr_equal(&inet6_sk(__sk)->rcv_saddr, (__daddr)) && \
(!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
-/* These can have wildcards, don't try too hard. */
-static inline int inet_lhashfn(const unsigned short num)
-{
- return num & (INET_LHTABLE_SIZE - 1);
-}
-
-static inline int inet_sk_listen_hashfn(const struct sock *sk)
-{
- return inet_lhashfn(inet_sk(sk)->num);
-}
-
#define MAX_TCP_HEADER (128 + MAX_HEADER)
/*
projects / deliverable / linux.git / blobdiff