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   1 /*
   2  * NET          Generic infrastructure for Network protocols.
   3  *
   4  *              Definitions for request_sock
   5  *
   6  * Authors:     Arnaldo Carvalho de Melo <acme@conectiva.com.br>
   7  *
   8  *              From code originally in include/net/tcp.h
   9  *
  10  *              This program is free software; you can redistribute it and/or
  11  *              modify it under the terms of the GNU General Public License
  12  *              as published by the Free Software Foundation; either version
  13  *              2 of the License, or (at your option) any later version.
  14  */
  15 #ifndef _REQUEST_SOCK_H
  16 #define _REQUEST_SOCK_H
  17
  18 #include <linux/slab.h>
  19 #include <linux/types.h>
  20 #include <net/sock.h>
  21
  22 struct request_sock;
  23 struct sk_buff;
  24 struct dst_entry;
  25 struct proto;
  26
  27 struct request_sock_ops {
  28         int             family;
  29         kmem_cache_t    *slab;
  30         int             obj_size;
  31         int             (*rtx_syn_ack)(struct sock *sk,
  32                                        struct request_sock *req,
  33                                        struct dst_entry *dst);
  34         void            (*send_ack)(struct sk_buff *skb,
  35                                     struct request_sock *req);
  36         void            (*send_reset)(struct sk_buff *skb);
  37         void            (*destructor)(struct request_sock *req);
  38 };
  39
  40 /* struct request_sock - mini sock to represent a connection request
  41  */
  42 struct request_sock {
  43         struct request_sock             *dl_next; /* Must be first member! */
  44         u16                             mss;
  45         u8                              retrans;
  46         u8                              __pad;
  47         /* The following two fields can be easily recomputed I think -AK */
  48         u32                             window_clamp; /* window clamp at creation time */
  49         u32                             rcv_wnd;          /* rcv_wnd offered first time */
  50         u32                             ts_recent;
  51         unsigned long                   expires;
  52         struct request_sock_ops         *rsk_ops;
  53         struct sock                     *sk;
  54 };
  55
  56 static inline struct request_sock *reqsk_alloc(struct request_sock_ops *ops)
  57 {
  58         struct request_sock *req = kmem_cache_alloc(ops->slab, SLAB_ATOMIC);
  59
  60         if (req != NULL)
  61                 req->rsk_ops = ops;
  62
  63         return req;
  64 }
  65
  66 static inline void __reqsk_free(struct request_sock *req)
  67 {
  68         kmem_cache_free(req->rsk_ops->slab, req);
  69 }
  70
  71 static inline void reqsk_free(struct request_sock *req)
  72 {
  73         req->rsk_ops->destructor(req);
  74         __reqsk_free(req);
  75 }
  76
  77 #endif /* _REQUEST_SOCK_H */