include/net/sctp/ulpevent.h

   1 /* SCTP kernel reference Implementation
   2  * (C) Copyright IBM Corp. 2001, 2004
   3  * Copyright (c) 1999-2000 Cisco, Inc.
   4  * Copyright (c) 1999-2001 Motorola, Inc.
   5  * Copyright (c) 2001 Intel Corp.
   6  * Copyright (c) 2001 Nokia, Inc.
   7  * Copyright (c) 2001 La Monte H.P. Yarroll
   8  *
   9  * These are the definitions needed for the sctp_ulpevent type.  The
  10  * sctp_ulpevent type is used to carry information from the state machine
  11  * upwards to the ULP.
  12  *
  13  * This file is part of the SCTP kernel reference Implementation
  14  *
  15  * The SCTP reference implementation is free software;
  16  * you can redistribute it and/or modify it under the terms of
  17  * the GNU General Public License as published by
  18  * the Free Software Foundation; either version 2, or (at your option)
  19  * any later version.
  20  *
  21  * The SCTP reference implementation is distributed in the hope that it
  22  * will be useful, but WITHOUT ANY WARRANTY; without even the implied
  23  *                 ************************
  24  * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  25  * See the GNU General Public License for more details.
  26  *
  27  * You should have received a copy of the GNU General Public License
  28  * along with GNU CC; see the file COPYING.  If not, write to
  29  * the Free Software Foundation, 59 Temple Place - Suite 330,
  30  * Boston, MA 02111-1307, USA.
  31  *
  32  * Please send any bug reports or fixes you make to the
  33  * email address(es):
  34  *    lksctp developers <lksctp-developers@lists.sourceforge.net>
  35  *
  36  * Or submit a bug report through the following website:
  37  *    http://www.sf.net/projects/lksctp
  38  *
  39  * Written or modified by:
  40  *   Jon Grimm             <jgrimm@us.ibm.com>
  41  *   La Monte H.P. Yarroll <piggy@acm.org>
  42  *   Karl Knutson          <karl@athena.chicago.il.us>
  43  *   Sridhar Samudrala     <sri@us.ibm.com>
  44  *
  45  * Any bugs reported given to us we will try to fix... any fixes shared will
  46  * be incorporated into the next SCTP release.
  47  */
  48
  49 #ifndef __sctp_ulpevent_h__
  50 #define __sctp_ulpevent_h__
  51
  52 /* A structure to carry information to the ULP (e.g. Sockets API) */
  53 /* Warning: This sits inside an skb.cb[] area.  Be very careful of
  54  * growing this structure as it is at the maximum limit now.
  55  */
  56 struct sctp_ulpevent {
  57         struct sctp_association *asoc;
  58         __u16 stream;
  59         __u16 ssn;
  60         __u16 flags;
  61         __u32 ppid;
  62         __u32 tsn;
  63         __u32 cumtsn;
  64         int msg_flags;
  65         int iif;
  66         unsigned int rmem_len;
  67 };
  68
  69 /* Retrieve the skb this event sits inside of. */
  70 static inline struct sk_buff *sctp_event2skb(struct sctp_ulpevent *ev)
  71 {
  72         return container_of((void *)ev, struct sk_buff, cb);
  73 }
  74
  75 /* Retrieve & cast the event sitting inside the skb. */
  76 static inline struct sctp_ulpevent *sctp_skb2event(struct sk_buff *skb)
  77 {
  78         return (struct sctp_ulpevent *)skb->cb;
  79 }
  80
  81 void sctp_ulpevent_free(struct sctp_ulpevent *);
  82 int sctp_ulpevent_is_notification(const struct sctp_ulpevent *);
  83 void sctp_queue_purge_ulpevents(struct sk_buff_head *list);
  84
  85 struct sctp_ulpevent *sctp_ulpevent_make_assoc_change(
  86         const struct sctp_association *asoc,
  87         __u16 flags,
  88         __u16 state,
  89         __u16 error,
  90         __u16 outbound,
  91         __u16 inbound,
  92         struct sctp_chunk *chunk,
  93         gfp_t gfp);
  94
  95 struct sctp_ulpevent *sctp_ulpevent_make_peer_addr_change(
  96         const struct sctp_association *asoc,
  97         const struct sockaddr_storage *aaddr,
  98         int flags,
  99         int state,
 100         int error,
 101         gfp_t gfp);
 102
 103 struct sctp_ulpevent *sctp_ulpevent_make_remote_error(
 104         const struct sctp_association *asoc,
 105         struct sctp_chunk *chunk,
 106         __u16 flags,
 107         gfp_t gfp);
 108 struct sctp_ulpevent *sctp_ulpevent_make_send_failed(
 109         const struct sctp_association *asoc,
 110         struct sctp_chunk *chunk,
 111         __u16 flags,
 112         __u32 error,
 113         gfp_t gfp);
 114
 115 struct sctp_ulpevent *sctp_ulpevent_make_shutdown_event(
 116         const struct sctp_association *asoc,
 117         __u16 flags,
 118         gfp_t gfp);
 119
 120 struct sctp_ulpevent *sctp_ulpevent_make_pdapi(
 121         const struct sctp_association *asoc,
 122         __u32 indication, gfp_t gfp);
 123
 124 struct sctp_ulpevent *sctp_ulpevent_make_adaptation_indication(
 125         const struct sctp_association *asoc, gfp_t gfp);
 126
 127 struct sctp_ulpevent *sctp_ulpevent_make_rcvmsg(struct sctp_association *asoc,
 128         struct sctp_chunk *chunk,
 129         gfp_t gfp);
 130
 131 void sctp_ulpevent_read_sndrcvinfo(const struct sctp_ulpevent *event,
 132         struct msghdr *);
 133 __u16 sctp_ulpevent_get_notification_type(const struct sctp_ulpevent *event);
 134
 135 /* Is this event type enabled? */
 136 static inline int sctp_ulpevent_type_enabled(__u16 sn_type,
 137                                              struct sctp_event_subscribe *mask)
 138 {
 139         char *amask = (char *) mask;
 140         return amask[sn_type - SCTP_SN_TYPE_BASE];
 141 }
 142
 143 /* Given an event subscription, is this event enabled? */
 144 static inline int sctp_ulpevent_is_enabled(const struct sctp_ulpevent *event,
 145                                            struct sctp_event_subscribe *mask)
 146 {
 147         __u16 sn_type;
 148         int enabled = 1;
 149
 150         if (sctp_ulpevent_is_notification(event)) {
 151                 sn_type = sctp_ulpevent_get_notification_type(event);
 152                 enabled = sctp_ulpevent_type_enabled(sn_type, mask);
 153         }
 154         return enabled;
 155 }
 156
 157 #endif /* __sctp_ulpevent_h__ */
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