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  * sctp_ulpevent is saved in sk->cb(48 bytes), whose last 4 bytes
  50  * have been taken by sock_skb_cb, So here it has to use 'packed'
  51  * to make sctp_ulpevent fit into the rest 44 bytes.
  52  */
  53 struct sctp_ulpevent {
  54         struct sctp_association *asoc;
  55         struct sctp_chunk *chunk;
  56         unsigned int rmem_len;
  57         union {
  58                 __u32 mid;
  59                 __u16 ssn;
  60         };
  61         union {
  62                 __u32 ppid;
  63                 __u32 fsn;
  64         };
  65         __u32 tsn;
  66         __u32 cumtsn;
  67         __u16 stream;
  68         __u16 flags;
  69         __u16 msg_flags;
  70 } __packed;
  71
  72 /* Retrieve the skb this event sits inside of. */
  73 static inline struct sk_buff *sctp_event2skb(const struct sctp_ulpevent *ev)
  74 {
  75         return container_of((void *)ev, struct sk_buff, cb);
  76 }
  77
  78 /* Retrieve & cast the event sitting inside the skb. */
  79 static inline struct sctp_ulpevent *sctp_skb2event(struct sk_buff *skb)
  80 {
  81         return (struct sctp_ulpevent *)skb->cb;
  82 }
  83
  84 void sctp_ulpevent_free(struct sctp_ulpevent *);
  85 int sctp_ulpevent_is_notification(const struct sctp_ulpevent *);
  86 unsigned int sctp_queue_purge_ulpevents(struct sk_buff_head *list);
  87
  88 struct sctp_ulpevent *sctp_ulpevent_make_assoc_change(
  89         const struct sctp_association *asoc,
  90         __u16 flags,
  91         __u16 state,
  92         __u16 error,
  93         __u16 outbound,
  94         __u16 inbound,
  95         struct sctp_chunk *chunk,
  96         gfp_t gfp);
  97
  98 struct sctp_ulpevent *sctp_ulpevent_make_peer_addr_change(
  99         const struct sctp_association *asoc,
 100         const struct sockaddr_storage *aaddr,
 101         int flags,
 102         int state,
 103         int error,
 104         gfp_t gfp);
 105
 106 struct sctp_ulpevent *sctp_ulpevent_make_remote_error(
 107         const struct sctp_association *asoc,
 108         struct sctp_chunk *chunk,
 109         __u16 flags,
 110         gfp_t gfp);
 111 struct sctp_ulpevent *sctp_ulpevent_make_send_failed(
 112         const struct sctp_association *asoc,
 113         struct sctp_chunk *chunk,
 114         __u16 flags,
 115         __u32 error,
 116         gfp_t gfp);
 117
 118 struct sctp_ulpevent *sctp_ulpevent_make_shutdown_event(
 119         const struct sctp_association *asoc,
 120         __u16 flags,
 121         gfp_t gfp);
 122
 123 struct sctp_ulpevent *sctp_ulpevent_make_pdapi(
 124         const struct sctp_association *asoc,
 125         __u32 indication, __u32 sid, __u32 seq,
 126         __u32 flags, gfp_t gfp);
 127
 128 struct sctp_ulpevent *sctp_ulpevent_make_adaptation_indication(
 129         const struct sctp_association *asoc, gfp_t gfp);
 130
 131 struct sctp_ulpevent *sctp_ulpevent_make_rcvmsg(struct sctp_association *asoc,
 132         struct sctp_chunk *chunk,
 133         gfp_t gfp);
 134
 135 struct sctp_ulpevent *sctp_ulpevent_make_authkey(
 136         const struct sctp_association *asoc, __u16 key_id,
 137         __u32 indication, gfp_t gfp);
 138
 139 struct sctp_ulpevent *sctp_ulpevent_make_sender_dry_event(
 140         const struct sctp_association *asoc, gfp_t gfp);
 141
 142 struct sctp_ulpevent *sctp_ulpevent_make_stream_reset_event(
 143         const struct sctp_association *asoc, __u16 flags,
 144         __u16 stream_num, __be16 *stream_list, gfp_t gfp);
 145
 146 struct sctp_ulpevent *sctp_ulpevent_make_assoc_reset_event(
 147         const struct sctp_association *asoc, __u16 flags,
 148          __u32 local_tsn, __u32 remote_tsn, gfp_t gfp);
 149
 150 struct sctp_ulpevent *sctp_ulpevent_make_stream_change_event(
 151         const struct sctp_association *asoc, __u16 flags,
 152         __u32 strchange_instrms, __u32 strchange_outstrms, gfp_t gfp);
 153
 154 struct sctp_ulpevent *sctp_make_reassembled_event(
 155         struct net *net, struct sk_buff_head *queue,
 156         struct sk_buff *f_frag, struct sk_buff *l_frag);
 157
 158 void sctp_ulpevent_read_sndrcvinfo(const struct sctp_ulpevent *event,
 159                                    struct msghdr *);
 160 void sctp_ulpevent_read_rcvinfo(const struct sctp_ulpevent *event,
 161                                 struct msghdr *);
 162 void sctp_ulpevent_read_nxtinfo(const struct sctp_ulpevent *event,
 163                                 struct msghdr *, struct sock *sk);
 164
 165 __u16 sctp_ulpevent_get_notification_type(const struct sctp_ulpevent *event);
 166
 167 /* Is this event type enabled? */
 168 static inline int sctp_ulpevent_type_enabled(__u16 sn_type,
 169                                              struct sctp_event_subscribe *mask)
 170 {
 171         int offset = sn_type - SCTP_SN_TYPE_BASE;
 172         char *amask = (char *) mask;
 173
 174         if (offset >= sizeof(struct sctp_event_subscribe))
 175                 return 0;
 176         return amask[offset];
 177 }
 178
 179 /* Given an event subscription, is this event enabled? */
 180 static inline int sctp_ulpevent_is_enabled(const struct sctp_ulpevent *event,
 181                                            struct sctp_event_subscribe *mask)
 182 {
 183         __u16 sn_type;
 184         int enabled = 1;
 185
 186         if (sctp_ulpevent_is_notification(event)) {
 187                 sn_type = sctp_ulpevent_get_notification_type(event);
 188                 enabled = sctp_ulpevent_type_enabled(sn_type, mask);
 189         }
 190         return enabled;
 191 }
 192
 193 #endif /* __sctp_ulpevent_h__ */