include/net/sctp/ulpevent.h

   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 void sctp_ulpevent_notify_peer_addr_change(struct sctp_transport *transport,
  84                                            int state, int error);
  85
  86 struct sctp_ulpevent *sctp_ulpevent_make_remote_error(
  87         const struct sctp_association *asoc,
  88         struct sctp_chunk *chunk,
  89         __u16 flags,
  90         gfp_t gfp);
  91 struct sctp_ulpevent *sctp_ulpevent_make_send_failed(
  92         const struct sctp_association *asoc,
  93         struct sctp_chunk *chunk,
  94         __u16 flags,
  95         __u32 error,
  96         gfp_t gfp);
  97
  98 struct sctp_ulpevent *sctp_ulpevent_make_send_failed_event(
  99         const struct sctp_association *asoc,
 100         struct sctp_chunk *chunk,
 101         __u16 flags,
 102         __u32 error,
 103         gfp_t gfp);
 104
 105 struct sctp_ulpevent *sctp_ulpevent_make_shutdown_event(
 106         const struct sctp_association *asoc,
 107         __u16 flags,
 108         gfp_t gfp);
 109
 110 struct sctp_ulpevent *sctp_ulpevent_make_pdapi(
 111         const struct sctp_association *asoc,
 112         __u32 indication, __u32 sid, __u32 seq,
 113         __u32 flags, gfp_t gfp);
 114
 115 struct sctp_ulpevent *sctp_ulpevent_make_adaptation_indication(
 116         const struct sctp_association *asoc, gfp_t gfp);
 117
 118 struct sctp_ulpevent *sctp_ulpevent_make_rcvmsg(struct sctp_association *asoc,
 119         struct sctp_chunk *chunk,
 120         gfp_t gfp);
 121
 122 struct sctp_ulpevent *sctp_ulpevent_make_authkey(
 123         const struct sctp_association *asoc, __u16 key_id,
 124         __u32 indication, gfp_t gfp);
 125
 126 struct sctp_ulpevent *sctp_ulpevent_make_sender_dry_event(
 127         const struct sctp_association *asoc, gfp_t gfp);
 128
 129 struct sctp_ulpevent *sctp_ulpevent_make_stream_reset_event(
 130         const struct sctp_association *asoc, __u16 flags,
 131         __u16 stream_num, __be16 *stream_list, gfp_t gfp);
 132
 133 struct sctp_ulpevent *sctp_ulpevent_make_assoc_reset_event(
 134         const struct sctp_association *asoc, __u16 flags,
 135          __u32 local_tsn, __u32 remote_tsn, gfp_t gfp);
 136
 137 struct sctp_ulpevent *sctp_ulpevent_make_stream_change_event(
 138         const struct sctp_association *asoc, __u16 flags,
 139         __u32 strchange_instrms, __u32 strchange_outstrms, gfp_t gfp);
 140
 141 struct sctp_ulpevent *sctp_make_reassembled_event(
 142         struct net *net, struct sk_buff_head *queue,
 143         struct sk_buff *f_frag, struct sk_buff *l_frag);
 144
 145 void sctp_ulpevent_read_sndrcvinfo(const struct sctp_ulpevent *event,
 146                                    struct msghdr *);
 147 void sctp_ulpevent_read_rcvinfo(const struct sctp_ulpevent *event,
 148                                 struct msghdr *);
 149 void sctp_ulpevent_read_nxtinfo(const struct sctp_ulpevent *event,
 150                                 struct msghdr *, struct sock *sk);
 151
 152 __u16 sctp_ulpevent_get_notification_type(const struct sctp_ulpevent *event);
 153
 154 static inline void sctp_ulpevent_type_set(__u16 *subscribe,
 155                                           __u16 sn_type, __u8 on)
 156 {
 157         if (sn_type > SCTP_SN_TYPE_MAX)
 158                 return;
 159
 160         if (on)
 161                 *subscribe |=  (1 << (sn_type - SCTP_SN_TYPE_BASE));
 162         else
 163                 *subscribe &= ~(1 << (sn_type - SCTP_SN_TYPE_BASE));
 164 }
 165
 166 /* Is this event type enabled? */
 167 static inline bool sctp_ulpevent_type_enabled(__u16 subscribe, __u16 sn_type)
 168 {
 169         if (sn_type > SCTP_SN_TYPE_MAX)
 170                 return false;
 171
 172         return subscribe & (1 << (sn_type - SCTP_SN_TYPE_BASE));
 173 }
 174
 175 /* Given an event subscription, is this event enabled? */
 176 static inline bool sctp_ulpevent_is_enabled(const struct sctp_ulpevent *event,
 177                                             __u16 subscribe)
 178 {
 179         __u16 sn_type;
 180
 181         if (!sctp_ulpevent_is_notification(event))
 182                 return true;
 183
 184         sn_type = sctp_ulpevent_get_notification_type(event);
 185
 186         return sctp_ulpevent_type_enabled(subscribe, sn_type);
 187 }
 188
 189 #endif /* __sctp_ulpevent_h__ */