include/net/sctp/ulpevent.h

   1 /* SCTP kernel 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 implementation
  14  *
  15  * This SCTP 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  * This SCTP 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, see
  29  * <http://www.gnu.org/licenses/>.
  30  *
  31  * Please send any bug reports or fixes you make to the
  32  * email address(es):
  33  *    lksctp developers <linux-sctp@vger.kernel.org>
  34  *
  35  * Written or modified by:
  36  *   Jon Grimm             <jgrimm@us.ibm.com>
  37  *   La Monte H.P. Yarroll <piggy@acm.org>
  38  *   Karl Knutson          <karl@athena.chicago.il.us>
  39  *   Sridhar Samudrala     <sri@us.ibm.com>
  40  */
  41
  42 #ifndef __sctp_ulpevent_h__
  43 #define __sctp_ulpevent_h__
  44
  45 /* A structure to carry information to the ULP (e.g. Sockets API) */
  46 /* Warning: This sits inside an skb.cb[] area.  Be very careful of
  47  * growing this structure as it is at the maximum limit now.
  48  */
  49 struct sctp_ulpevent {
  50         struct sctp_association *asoc;
  51         __u16 stream;
  52         __u16 ssn;
  53         __u16 flags;
  54         __u32 ppid;
  55         __u32 tsn;
  56         __u32 cumtsn;
  57         int msg_flags;
  58         int iif;
  59         unsigned int rmem_len;
  60 };
  61
  62 /* Retrieve the skb this event sits inside of. */
  63 static inline struct sk_buff *sctp_event2skb(const struct sctp_ulpevent *ev)
  64 {
  65         return container_of((void *)ev, struct sk_buff, cb);
  66 }
  67
  68 /* Retrieve & cast the event sitting inside the skb. */
  69 static inline struct sctp_ulpevent *sctp_skb2event(struct sk_buff *skb)
  70 {
  71         return (struct sctp_ulpevent *)skb->cb;
  72 }
  73
  74 void sctp_ulpevent_free(struct sctp_ulpevent *);
  75 int sctp_ulpevent_is_notification(const struct sctp_ulpevent *);
  76 unsigned int sctp_queue_purge_ulpevents(struct sk_buff_head *list);
  77
  78 struct sctp_ulpevent *sctp_ulpevent_make_assoc_change(
  79         const struct sctp_association *asoc,
  80         __u16 flags,
  81         __u16 state,
  82         __u16 error,
  83         __u16 outbound,
  84         __u16 inbound,
  85         struct sctp_chunk *chunk,
  86         gfp_t gfp);
  87
  88 struct sctp_ulpevent *sctp_ulpevent_make_peer_addr_change(
  89         const struct sctp_association *asoc,
  90         const struct sockaddr_storage *aaddr,
  91         int flags,
  92         int state,
  93         int error,
  94         gfp_t gfp);
  95
  96 struct sctp_ulpevent *sctp_ulpevent_make_remote_error(
  97         const struct sctp_association *asoc,
  98         struct sctp_chunk *chunk,
  99         __u16 flags,
 100         gfp_t gfp);
 101 struct sctp_ulpevent *sctp_ulpevent_make_send_failed(
 102         const struct sctp_association *asoc,
 103         struct sctp_chunk *chunk,
 104         __u16 flags,
 105         __u32 error,
 106         gfp_t gfp);
 107
 108 struct sctp_ulpevent *sctp_ulpevent_make_shutdown_event(
 109         const struct sctp_association *asoc,
 110         __u16 flags,
 111         gfp_t gfp);
 112
 113 struct sctp_ulpevent *sctp_ulpevent_make_pdapi(
 114         const struct sctp_association *asoc,
 115         __u32 indication, gfp_t gfp);
 116
 117 struct sctp_ulpevent *sctp_ulpevent_make_adaptation_indication(
 118         const struct sctp_association *asoc, gfp_t gfp);
 119
 120 struct sctp_ulpevent *sctp_ulpevent_make_rcvmsg(struct sctp_association *asoc,
 121         struct sctp_chunk *chunk,
 122         gfp_t gfp);
 123
 124 struct sctp_ulpevent *sctp_ulpevent_make_authkey(
 125         const struct sctp_association *asoc, __u16 key_id,
 126         __u32 indication, gfp_t gfp);
 127
 128 struct sctp_ulpevent *sctp_ulpevent_make_sender_dry_event(
 129         const struct sctp_association *asoc, gfp_t gfp);
 130
 131 void sctp_ulpevent_read_sndrcvinfo(const struct sctp_ulpevent *event,
 132                                    struct msghdr *);
 133 void sctp_ulpevent_read_rcvinfo(const struct sctp_ulpevent *event,
 134                                 struct msghdr *);
 135 void sctp_ulpevent_read_nxtinfo(const struct sctp_ulpevent *event,
 136                                 struct msghdr *, struct sock *sk);
 137
 138 __u16 sctp_ulpevent_get_notification_type(const struct sctp_ulpevent *event);
 139
 140 /* Is this event type enabled? */
 141 static inline int sctp_ulpevent_type_enabled(__u16 sn_type,
 142                                              struct sctp_event_subscribe *mask)
 143 {
 144         char *amask = (char *) mask;
 145         return amask[sn_type - SCTP_SN_TYPE_BASE];
 146 }
 147
 148 /* Given an event subscription, is this event enabled? */
 149 static inline int sctp_ulpevent_is_enabled(const struct sctp_ulpevent *event,
 150                                            struct sctp_event_subscribe *mask)
 151 {
 152         __u16 sn_type;
 153         int enabled = 1;
 154
 155         if (sctp_ulpevent_is_notification(event)) {
 156                 sn_type = sctp_ulpevent_get_notification_type(event);
 157                 enabled = sctp_ulpevent_type_enabled(sn_type, mask);
 158         }
 159         return enabled;
 160 }
 161
 162 #endif /* __sctp_ulpevent_h__ */