root/include/net/sctp/ulpevent.h

INCLUDED FROM

DEFINITIONS

1. sctp_event2skb
2. sctp_skb2event
3. sctp_ulpevent_type_set
4. sctp_ulpevent_type_enabled
5. sctp_ulpevent_is_enabled

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /* SCTP kernel implementation
   3  * (C) Copyright IBM Corp. 2001, 2004
   4  * Copyright (c) 1999-2000 Cisco, Inc.
   5  * Copyright (c) 1999-2001 Motorola, Inc.
   6  * Copyright (c) 2001 Intel Corp.
   7  * Copyright (c) 2001 Nokia, Inc.
   8  * Copyright (c) 2001 La Monte H.P. Yarroll
   9  *
  10  * These are the definitions needed for the sctp_ulpevent type.  The
  11  * sctp_ulpevent type is used to carry information from the state machine
  12  * upwards to the ULP.
  13  *
  14  * This file is part of the SCTP kernel implementation
  15  *
  16  * Please send any bug reports or fixes you make to the
  17  * email address(es):
  18  *    lksctp developers <linux-sctp@vger.kernel.org>
  19  *
  20  * Written or modified by:
  21  *   Jon Grimm             <jgrimm@us.ibm.com>
  22  *   La Monte H.P. Yarroll <piggy@acm.org>
  23  *   Karl Knutson          <karl@athena.chicago.il.us>
  24  *   Sridhar Samudrala     <sri@us.ibm.com>
  25  */
  26 
  27 #ifndef __sctp_ulpevent_h__
  28 #define __sctp_ulpevent_h__
  29 
  30 /* A structure to carry information to the ULP (e.g. Sockets API) */
  31 /* Warning: This sits inside an skb.cb[] area.  Be very careful of
  32  * growing this structure as it is at the maximum limit now.
  33  *
  34  * sctp_ulpevent is saved in sk->cb(48 bytes), whose last 4 bytes
  35  * have been taken by sock_skb_cb, So here it has to use 'packed'
  36  * to make sctp_ulpevent fit into the rest 44 bytes.
  37  */
  38 struct sctp_ulpevent {
  39         struct sctp_association *asoc;
  40         struct sctp_chunk *chunk;
  41         unsigned int rmem_len;
  42         union {
  43                 __u32 mid;
  44                 __u16 ssn;
  45         };
  46         union {
  47                 __u32 ppid;
  48                 __u32 fsn;
  49         };
  50         __u32 tsn;
  51         __u32 cumtsn;
  52         __u16 stream;
  53         __u16 flags;
  54         __u16 msg_flags;
  55 } __packed;
  56 
  57 /* Retrieve the skb this event sits inside of. */
  58 static inline struct sk_buff *sctp_event2skb(const struct sctp_ulpevent *ev)
  59 {
  60         return container_of((void *)ev, struct sk_buff, cb);
  61 }
  62 
  63 /* Retrieve & cast the event sitting inside the skb. */
  64 static inline struct sctp_ulpevent *sctp_skb2event(struct sk_buff *skb)
  65 {
  66         return (struct sctp_ulpevent *)skb->cb;
  67 }
  68 
  69 void sctp_ulpevent_free(struct sctp_ulpevent *);
  70 int sctp_ulpevent_is_notification(const struct sctp_ulpevent *);
  71 unsigned int sctp_queue_purge_ulpevents(struct sk_buff_head *list);
  72 
  73 struct sctp_ulpevent *sctp_ulpevent_make_assoc_change(
  74         const struct sctp_association *asoc,
  75         __u16 flags,
  76         __u16 state,
  77         __u16 error,
  78         __u16 outbound,
  79         __u16 inbound,
  80         struct sctp_chunk *chunk,
  81         gfp_t gfp);
  82 
  83 struct sctp_ulpevent *sctp_ulpevent_make_peer_addr_change(
  84         const struct sctp_association *asoc,
  85         const struct sockaddr_storage *aaddr,
  86         int flags,
  87         int state,
  88         int error,
  89         gfp_t gfp);
  90 
  91 struct sctp_ulpevent *sctp_ulpevent_make_remote_error(
  92         const struct sctp_association *asoc,
  93         struct sctp_chunk *chunk,
  94         __u16 flags,
  95         gfp_t gfp);
  96 struct sctp_ulpevent *sctp_ulpevent_make_send_failed(
  97         const struct sctp_association *asoc,
  98         struct sctp_chunk *chunk,
  99         __u16 flags,
 100         __u32 error,
 101         gfp_t gfp);
 102 
 103 struct sctp_ulpevent *sctp_ulpevent_make_shutdown_event(
 104         const struct sctp_association *asoc,
 105         __u16 flags,
 106         gfp_t gfp);
 107 
 108 struct sctp_ulpevent *sctp_ulpevent_make_pdapi(
 109         const struct sctp_association *asoc,
 110         __u32 indication, __u32 sid, __u32 seq,
 111         __u32 flags, gfp_t gfp);
 112 
 113 struct sctp_ulpevent *sctp_ulpevent_make_adaptation_indication(
 114         const struct sctp_association *asoc, gfp_t gfp);
 115 
 116 struct sctp_ulpevent *sctp_ulpevent_make_rcvmsg(struct sctp_association *asoc,
 117         struct sctp_chunk *chunk,
 118         gfp_t gfp);
 119 
 120 struct sctp_ulpevent *sctp_ulpevent_make_authkey(
 121         const struct sctp_association *asoc, __u16 key_id,
 122         __u32 indication, gfp_t gfp);
 123 
 124 struct sctp_ulpevent *sctp_ulpevent_make_sender_dry_event(
 125         const struct sctp_association *asoc, gfp_t gfp);
 126 
 127 struct sctp_ulpevent *sctp_ulpevent_make_stream_reset_event(
 128         const struct sctp_association *asoc, __u16 flags,
 129         __u16 stream_num, __be16 *stream_list, gfp_t gfp);
 130 
 131 struct sctp_ulpevent *sctp_ulpevent_make_assoc_reset_event(
 132         const struct sctp_association *asoc, __u16 flags,
 133          __u32 local_tsn, __u32 remote_tsn, gfp_t gfp);
 134 
 135 struct sctp_ulpevent *sctp_ulpevent_make_stream_change_event(
 136         const struct sctp_association *asoc, __u16 flags,
 137         __u32 strchange_instrms, __u32 strchange_outstrms, gfp_t gfp);
 138 
 139 struct sctp_ulpevent *sctp_make_reassembled_event(
 140         struct net *net, struct sk_buff_head *queue,
 141         struct sk_buff *f_frag, struct sk_buff *l_frag);
 142 
 143 void sctp_ulpevent_read_sndrcvinfo(const struct sctp_ulpevent *event,
 144                                    struct msghdr *);
 145 void sctp_ulpevent_read_rcvinfo(const struct sctp_ulpevent *event,
 146                                 struct msghdr *);
 147 void sctp_ulpevent_read_nxtinfo(const struct sctp_ulpevent *event,
 148                                 struct msghdr *, struct sock *sk);
 149 
 150 __u16 sctp_ulpevent_get_notification_type(const struct sctp_ulpevent *event);
 151 
 152 static inline void sctp_ulpevent_type_set(__u16 *subscribe,
 153                                           __u16 sn_type, __u8 on)
 154 {
 155         if (sn_type > SCTP_SN_TYPE_MAX)
 156                 return;
 157 
 158         if (on)
 159                 *subscribe |=  (1 << (sn_type - SCTP_SN_TYPE_BASE));
 160         else
 161                 *subscribe &= ~(1 << (sn_type - SCTP_SN_TYPE_BASE));
 162 }
 163 
 164 /* Is this event type enabled? */
 165 static inline bool sctp_ulpevent_type_enabled(__u16 subscribe, __u16 sn_type)
 166 {
 167         if (sn_type > SCTP_SN_TYPE_MAX)
 168                 return false;
 169 
 170         return subscribe & (1 << (sn_type - SCTP_SN_TYPE_BASE));
 171 }
 172 
 173 /* Given an event subscription, is this event enabled? */
 174 static inline bool sctp_ulpevent_is_enabled(const struct sctp_ulpevent *event,
 175                                             __u16 subscribe)
 176 {
 177         __u16 sn_type;
 178 
 179         if (!sctp_ulpevent_is_notification(event))
 180                 return true;
 181 
 182         sn_type = sctp_ulpevent_get_notification_type(event);
 183 
 184         return sctp_ulpevent_type_enabled(subscribe, sn_type);
 185 }
 186 
 187 #endif /* __sctp_ulpevent_h__ */