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xianfeng |
/* SCTP kernel reference Implementation
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* (C) Copyright IBM Corp. 2001, 2004
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* Copyright (c) 1999-2000 Cisco, Inc.
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* Copyright (c) 1999-2001 Motorola, Inc.
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* Copyright (c) 2001 Intel Corp.
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* Copyright (c) 2001 Nokia, Inc.
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* Copyright (c) 2001 La Monte H.P. Yarroll
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*
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* These functions manipulate an sctp event. The struct ulpevent is used
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* to carry notifications and data to the ULP (sockets).
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* The SCTP reference implementation is free software;
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* you can redistribute it and/or modify it under the terms of
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* the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* The SCTP reference implementation is distributed in the hope that it
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* will be useful, but WITHOUT ANY WARRANTY; without even the implied
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* ************************
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* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNU CC; see the file COPYING. If not, write to
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* the Free Software Foundation, 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*
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* Please send any bug reports or fixes you make to the
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* email address(es):
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* lksctp developers <lksctp-developers@lists.sourceforge.net>
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*
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* Or submit a bug report through the following website:
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* http://www.sf.net/projects/lksctp
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*
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* Written or modified by:
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* Jon Grimm <jgrimm@us.ibm.com>
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* La Monte H.P. Yarroll <piggy@acm.org>
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* Ardelle Fan <ardelle.fan@intel.com>
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* Sridhar Samudrala <sri@us.ibm.com>
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*
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* Any bugs reported given to us we will try to fix... any fixes shared will
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* be incorporated into the next SCTP release.
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*/
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#include <linux/types.h>
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#include <linux/skbuff.h>
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#include <net/sctp/structs.h>
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48 |
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#include <net/sctp/sctp.h>
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#include <net/sctp/sm.h>
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static void sctp_ulpevent_receive_data(struct sctp_ulpevent *event,
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struct sctp_association *asoc);
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static void sctp_ulpevent_release_data(struct sctp_ulpevent *event);
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static void sctp_ulpevent_release_frag_data(struct sctp_ulpevent *event);
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57 |
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/* Initialize an ULP event from an given skb. */
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SCTP_STATIC void sctp_ulpevent_init(struct sctp_ulpevent *event,
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int msg_flags,
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unsigned int len)
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{
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62 |
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memset(event, 0, sizeof(struct sctp_ulpevent));
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event->msg_flags = msg_flags;
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event->rmem_len = len;
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}
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/* Create a new sctp_ulpevent. */
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SCTP_STATIC struct sctp_ulpevent *sctp_ulpevent_new(int size, int msg_flags,
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gfp_t gfp)
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{
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struct sctp_ulpevent *event;
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struct sk_buff *skb;
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skb = alloc_skb(size, gfp);
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if (!skb)
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goto fail;
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event = sctp_skb2event(skb);
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sctp_ulpevent_init(event, msg_flags, skb->truesize);
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return event;
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fail:
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return NULL;
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}
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/* Is this a MSG_NOTIFICATION? */
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int sctp_ulpevent_is_notification(const struct sctp_ulpevent *event)
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{
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return MSG_NOTIFICATION == (event->msg_flags & MSG_NOTIFICATION);
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}
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/* Hold the association in case the msg_name needs read out of
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* the association.
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*/
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static inline void sctp_ulpevent_set_owner(struct sctp_ulpevent *event,
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const struct sctp_association *asoc)
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{
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struct sk_buff *skb;
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/* Cast away the const, as we are just wanting to
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* bump the reference count.
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*/
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sctp_association_hold((struct sctp_association *)asoc);
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skb = sctp_event2skb(event);
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event->asoc = (struct sctp_association *)asoc;
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atomic_add(event->rmem_len, &event->asoc->rmem_alloc);
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sctp_skb_set_owner_r(skb, asoc->base.sk);
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}
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/* A simple destructor to give up the reference to the association. */
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static inline void sctp_ulpevent_release_owner(struct sctp_ulpevent *event)
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{
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struct sctp_association *asoc = event->asoc;
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atomic_sub(event->rmem_len, &asoc->rmem_alloc);
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sctp_association_put(asoc);
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}
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/* Create and initialize an SCTP_ASSOC_CHANGE event.
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*
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* 5.3.1.1 SCTP_ASSOC_CHANGE
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*
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* Communication notifications inform the ULP that an SCTP association
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125 |
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* has either begun or ended. The identifier for a new association is
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126 |
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* provided by this notification.
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*
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128 |
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* Note: There is no field checking here. If a field is unused it will be
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* zero'd out.
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130 |
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*/
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131 |
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struct sctp_ulpevent *sctp_ulpevent_make_assoc_change(
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const struct sctp_association *asoc,
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__u16 flags, __u16 state, __u16 error, __u16 outbound,
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__u16 inbound, struct sctp_chunk *chunk, gfp_t gfp)
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{
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136 |
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struct sctp_ulpevent *event;
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137 |
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struct sctp_assoc_change *sac;
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138 |
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struct sk_buff *skb;
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139 |
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140 |
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/* If the lower layer passed in the chunk, it will be
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* an ABORT, so we need to include it in the sac_info.
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142 |
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*/
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143 |
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if (chunk) {
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/* Copy the chunk data to a new skb and reserve enough
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* head room to use as notification.
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*/
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skb = skb_copy_expand(chunk->skb,
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sizeof(struct sctp_assoc_change), 0, gfp);
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if (!skb)
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goto fail;
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/* Embed the event fields inside the cloned skb. */
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event = sctp_skb2event(skb);
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sctp_ulpevent_init(event, MSG_NOTIFICATION, skb->truesize);
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/* Include the notification structure */
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sac = (struct sctp_assoc_change *)
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skb_push(skb, sizeof(struct sctp_assoc_change));
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160 |
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/* Trim the buffer to the right length. */
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skb_trim(skb, sizeof(struct sctp_assoc_change) +
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ntohs(chunk->chunk_hdr->length) -
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sizeof(sctp_chunkhdr_t));
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} else {
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event = sctp_ulpevent_new(sizeof(struct sctp_assoc_change),
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MSG_NOTIFICATION, gfp);
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if (!event)
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goto fail;
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170 |
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171 |
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skb = sctp_event2skb(event);
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sac = (struct sctp_assoc_change *) skb_put(skb,
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sizeof(struct sctp_assoc_change));
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174 |
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}
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175 |
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176 |
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/* Socket Extensions for SCTP
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177 |
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* 5.3.1.1 SCTP_ASSOC_CHANGE
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178 |
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*
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179 |
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* sac_type:
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180 |
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* It should be SCTP_ASSOC_CHANGE.
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181 |
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*/
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182 |
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sac->sac_type = SCTP_ASSOC_CHANGE;
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183 |
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184 |
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/* Socket Extensions for SCTP
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185 |
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* 5.3.1.1 SCTP_ASSOC_CHANGE
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186 |
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*
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187 |
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* sac_state: 32 bits (signed integer)
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188 |
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* This field holds one of a number of values that communicate the
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189 |
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* event that happened to the association.
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190 |
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*/
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191 |
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sac->sac_state = state;
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192 |
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193 |
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/* Socket Extensions for SCTP
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194 |
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* 5.3.1.1 SCTP_ASSOC_CHANGE
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195 |
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*
|
196 |
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* sac_flags: 16 bits (unsigned integer)
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197 |
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* Currently unused.
|
198 |
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*/
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199 |
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sac->sac_flags = 0;
|
200 |
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|
201 |
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/* Socket Extensions for SCTP
|
202 |
|
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* 5.3.1.1 SCTP_ASSOC_CHANGE
|
203 |
|
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*
|
204 |
|
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* sac_length: sizeof (__u32)
|
205 |
|
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* This field is the total length of the notification data, including
|
206 |
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* the notification header.
|
207 |
|
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*/
|
208 |
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sac->sac_length = sizeof(struct sctp_assoc_change);
|
209 |
|
|
|
210 |
|
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/* Socket Extensions for SCTP
|
211 |
|
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* 5.3.1.1 SCTP_ASSOC_CHANGE
|
212 |
|
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*
|
213 |
|
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* sac_error: 32 bits (signed integer)
|
214 |
|
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*
|
215 |
|
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* If the state was reached due to a error condition (e.g.
|
216 |
|
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* COMMUNICATION_LOST) any relevant error information is available in
|
217 |
|
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* this field. This corresponds to the protocol error codes defined in
|
218 |
|
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* [SCTP].
|
219 |
|
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*/
|
220 |
|
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sac->sac_error = error;
|
221 |
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|
222 |
|
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/* Socket Extensions for SCTP
|
223 |
|
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* 5.3.1.1 SCTP_ASSOC_CHANGE
|
224 |
|
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*
|
225 |
|
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* sac_outbound_streams: 16 bits (unsigned integer)
|
226 |
|
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* sac_inbound_streams: 16 bits (unsigned integer)
|
227 |
|
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*
|
228 |
|
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* The maximum number of streams allowed in each direction are
|
229 |
|
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* available in sac_outbound_streams and sac_inbound streams.
|
230 |
|
|
*/
|
231 |
|
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sac->sac_outbound_streams = outbound;
|
232 |
|
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sac->sac_inbound_streams = inbound;
|
233 |
|
|
|
234 |
|
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/* Socket Extensions for SCTP
|
235 |
|
|
* 5.3.1.1 SCTP_ASSOC_CHANGE
|
236 |
|
|
*
|
237 |
|
|
* sac_assoc_id: sizeof (sctp_assoc_t)
|
238 |
|
|
*
|
239 |
|
|
* The association id field, holds the identifier for the association.
|
240 |
|
|
* All notifications for a given association have the same association
|
241 |
|
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* identifier. For TCP style socket, this field is ignored.
|
242 |
|
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*/
|
243 |
|
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sctp_ulpevent_set_owner(event, asoc);
|
244 |
|
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sac->sac_assoc_id = sctp_assoc2id(asoc);
|
245 |
|
|
|
246 |
|
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return event;
|
247 |
|
|
|
248 |
|
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fail:
|
249 |
|
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return NULL;
|
250 |
|
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}
|
251 |
|
|
|
252 |
|
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/* Create and initialize an SCTP_PEER_ADDR_CHANGE event.
|
253 |
|
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*
|
254 |
|
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* Socket Extensions for SCTP - draft-01
|
255 |
|
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* 5.3.1.2 SCTP_PEER_ADDR_CHANGE
|
256 |
|
|
*
|
257 |
|
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* When a destination address on a multi-homed peer encounters a change
|
258 |
|
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* an interface details event is sent.
|
259 |
|
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*/
|
260 |
|
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struct sctp_ulpevent *sctp_ulpevent_make_peer_addr_change(
|
261 |
|
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const struct sctp_association *asoc,
|
262 |
|
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const struct sockaddr_storage *aaddr,
|
263 |
|
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int flags, int state, int error, gfp_t gfp)
|
264 |
|
|
{
|
265 |
|
|
struct sctp_ulpevent *event;
|
266 |
|
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struct sctp_paddr_change *spc;
|
267 |
|
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struct sk_buff *skb;
|
268 |
|
|
|
269 |
|
|
event = sctp_ulpevent_new(sizeof(struct sctp_paddr_change),
|
270 |
|
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MSG_NOTIFICATION, gfp);
|
271 |
|
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if (!event)
|
272 |
|
|
goto fail;
|
273 |
|
|
|
274 |
|
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skb = sctp_event2skb(event);
|
275 |
|
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spc = (struct sctp_paddr_change *)
|
276 |
|
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skb_put(skb, sizeof(struct sctp_paddr_change));
|
277 |
|
|
|
278 |
|
|
/* Sockets API Extensions for SCTP
|
279 |
|
|
* Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE
|
280 |
|
|
*
|
281 |
|
|
* spc_type:
|
282 |
|
|
*
|
283 |
|
|
* It should be SCTP_PEER_ADDR_CHANGE.
|
284 |
|
|
*/
|
285 |
|
|
spc->spc_type = SCTP_PEER_ADDR_CHANGE;
|
286 |
|
|
|
287 |
|
|
/* Sockets API Extensions for SCTP
|
288 |
|
|
* Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE
|
289 |
|
|
*
|
290 |
|
|
* spc_length: sizeof (__u32)
|
291 |
|
|
*
|
292 |
|
|
* This field is the total length of the notification data, including
|
293 |
|
|
* the notification header.
|
294 |
|
|
*/
|
295 |
|
|
spc->spc_length = sizeof(struct sctp_paddr_change);
|
296 |
|
|
|
297 |
|
|
/* Sockets API Extensions for SCTP
|
298 |
|
|
* Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE
|
299 |
|
|
*
|
300 |
|
|
* spc_flags: 16 bits (unsigned integer)
|
301 |
|
|
* Currently unused.
|
302 |
|
|
*/
|
303 |
|
|
spc->spc_flags = 0;
|
304 |
|
|
|
305 |
|
|
/* Sockets API Extensions for SCTP
|
306 |
|
|
* Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE
|
307 |
|
|
*
|
308 |
|
|
* spc_state: 32 bits (signed integer)
|
309 |
|
|
*
|
310 |
|
|
* This field holds one of a number of values that communicate the
|
311 |
|
|
* event that happened to the address.
|
312 |
|
|
*/
|
313 |
|
|
spc->spc_state = state;
|
314 |
|
|
|
315 |
|
|
/* Sockets API Extensions for SCTP
|
316 |
|
|
* Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE
|
317 |
|
|
*
|
318 |
|
|
* spc_error: 32 bits (signed integer)
|
319 |
|
|
*
|
320 |
|
|
* If the state was reached due to any error condition (e.g.
|
321 |
|
|
* ADDRESS_UNREACHABLE) any relevant error information is available in
|
322 |
|
|
* this field.
|
323 |
|
|
*/
|
324 |
|
|
spc->spc_error = error;
|
325 |
|
|
|
326 |
|
|
/* Socket Extensions for SCTP
|
327 |
|
|
* 5.3.1.1 SCTP_ASSOC_CHANGE
|
328 |
|
|
*
|
329 |
|
|
* spc_assoc_id: sizeof (sctp_assoc_t)
|
330 |
|
|
*
|
331 |
|
|
* The association id field, holds the identifier for the association.
|
332 |
|
|
* All notifications for a given association have the same association
|
333 |
|
|
* identifier. For TCP style socket, this field is ignored.
|
334 |
|
|
*/
|
335 |
|
|
sctp_ulpevent_set_owner(event, asoc);
|
336 |
|
|
spc->spc_assoc_id = sctp_assoc2id(asoc);
|
337 |
|
|
|
338 |
|
|
/* Sockets API Extensions for SCTP
|
339 |
|
|
* Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE
|
340 |
|
|
*
|
341 |
|
|
* spc_aaddr: sizeof (struct sockaddr_storage)
|
342 |
|
|
*
|
343 |
|
|
* The affected address field, holds the remote peer's address that is
|
344 |
|
|
* encountering the change of state.
|
345 |
|
|
*/
|
346 |
|
|
memcpy(&spc->spc_aaddr, aaddr, sizeof(struct sockaddr_storage));
|
347 |
|
|
|
348 |
|
|
/* Map ipv4 address into v4-mapped-on-v6 address. */
|
349 |
|
|
sctp_get_pf_specific(asoc->base.sk->sk_family)->addr_v4map(
|
350 |
|
|
sctp_sk(asoc->base.sk),
|
351 |
|
|
(union sctp_addr *)&spc->spc_aaddr);
|
352 |
|
|
|
353 |
|
|
return event;
|
354 |
|
|
|
355 |
|
|
fail:
|
356 |
|
|
return NULL;
|
357 |
|
|
}
|
358 |
|
|
|
359 |
|
|
/* Create and initialize an SCTP_REMOTE_ERROR notification.
|
360 |
|
|
*
|
361 |
|
|
* Note: This assumes that the chunk->skb->data already points to the
|
362 |
|
|
* operation error payload.
|
363 |
|
|
*
|
364 |
|
|
* Socket Extensions for SCTP - draft-01
|
365 |
|
|
* 5.3.1.3 SCTP_REMOTE_ERROR
|
366 |
|
|
*
|
367 |
|
|
* A remote peer may send an Operational Error message to its peer.
|
368 |
|
|
* This message indicates a variety of error conditions on an
|
369 |
|
|
* association. The entire error TLV as it appears on the wire is
|
370 |
|
|
* included in a SCTP_REMOTE_ERROR event. Please refer to the SCTP
|
371 |
|
|
* specification [SCTP] and any extensions for a list of possible
|
372 |
|
|
* error formats.
|
373 |
|
|
*/
|
374 |
|
|
struct sctp_ulpevent *sctp_ulpevent_make_remote_error(
|
375 |
|
|
const struct sctp_association *asoc, struct sctp_chunk *chunk,
|
376 |
|
|
__u16 flags, gfp_t gfp)
|
377 |
|
|
{
|
378 |
|
|
struct sctp_ulpevent *event;
|
379 |
|
|
struct sctp_remote_error *sre;
|
380 |
|
|
struct sk_buff *skb;
|
381 |
|
|
sctp_errhdr_t *ch;
|
382 |
|
|
__be16 cause;
|
383 |
|
|
int elen;
|
384 |
|
|
|
385 |
|
|
ch = (sctp_errhdr_t *)(chunk->skb->data);
|
386 |
|
|
cause = ch->cause;
|
387 |
|
|
elen = WORD_ROUND(ntohs(ch->length)) - sizeof(sctp_errhdr_t);
|
388 |
|
|
|
389 |
|
|
/* Pull off the ERROR header. */
|
390 |
|
|
skb_pull(chunk->skb, sizeof(sctp_errhdr_t));
|
391 |
|
|
|
392 |
|
|
/* Copy the skb to a new skb with room for us to prepend
|
393 |
|
|
* notification with.
|
394 |
|
|
*/
|
395 |
|
|
skb = skb_copy_expand(chunk->skb, sizeof(struct sctp_remote_error),
|
396 |
|
|
0, gfp);
|
397 |
|
|
|
398 |
|
|
/* Pull off the rest of the cause TLV from the chunk. */
|
399 |
|
|
skb_pull(chunk->skb, elen);
|
400 |
|
|
if (!skb)
|
401 |
|
|
goto fail;
|
402 |
|
|
|
403 |
|
|
/* Embed the event fields inside the cloned skb. */
|
404 |
|
|
event = sctp_skb2event(skb);
|
405 |
|
|
sctp_ulpevent_init(event, MSG_NOTIFICATION, skb->truesize);
|
406 |
|
|
|
407 |
|
|
sre = (struct sctp_remote_error *)
|
408 |
|
|
skb_push(skb, sizeof(struct sctp_remote_error));
|
409 |
|
|
|
410 |
|
|
/* Trim the buffer to the right length. */
|
411 |
|
|
skb_trim(skb, sizeof(struct sctp_remote_error) + elen);
|
412 |
|
|
|
413 |
|
|
/* Socket Extensions for SCTP
|
414 |
|
|
* 5.3.1.3 SCTP_REMOTE_ERROR
|
415 |
|
|
*
|
416 |
|
|
* sre_type:
|
417 |
|
|
* It should be SCTP_REMOTE_ERROR.
|
418 |
|
|
*/
|
419 |
|
|
sre->sre_type = SCTP_REMOTE_ERROR;
|
420 |
|
|
|
421 |
|
|
/*
|
422 |
|
|
* Socket Extensions for SCTP
|
423 |
|
|
* 5.3.1.3 SCTP_REMOTE_ERROR
|
424 |
|
|
*
|
425 |
|
|
* sre_flags: 16 bits (unsigned integer)
|
426 |
|
|
* Currently unused.
|
427 |
|
|
*/
|
428 |
|
|
sre->sre_flags = 0;
|
429 |
|
|
|
430 |
|
|
/* Socket Extensions for SCTP
|
431 |
|
|
* 5.3.1.3 SCTP_REMOTE_ERROR
|
432 |
|
|
*
|
433 |
|
|
* sre_length: sizeof (__u32)
|
434 |
|
|
*
|
435 |
|
|
* This field is the total length of the notification data,
|
436 |
|
|
* including the notification header.
|
437 |
|
|
*/
|
438 |
|
|
sre->sre_length = skb->len;
|
439 |
|
|
|
440 |
|
|
/* Socket Extensions for SCTP
|
441 |
|
|
* 5.3.1.3 SCTP_REMOTE_ERROR
|
442 |
|
|
*
|
443 |
|
|
* sre_error: 16 bits (unsigned integer)
|
444 |
|
|
* This value represents one of the Operational Error causes defined in
|
445 |
|
|
* the SCTP specification, in network byte order.
|
446 |
|
|
*/
|
447 |
|
|
sre->sre_error = cause;
|
448 |
|
|
|
449 |
|
|
/* Socket Extensions for SCTP
|
450 |
|
|
* 5.3.1.3 SCTP_REMOTE_ERROR
|
451 |
|
|
*
|
452 |
|
|
* sre_assoc_id: sizeof (sctp_assoc_t)
|
453 |
|
|
*
|
454 |
|
|
* The association id field, holds the identifier for the association.
|
455 |
|
|
* All notifications for a given association have the same association
|
456 |
|
|
* identifier. For TCP style socket, this field is ignored.
|
457 |
|
|
*/
|
458 |
|
|
sctp_ulpevent_set_owner(event, asoc);
|
459 |
|
|
sre->sre_assoc_id = sctp_assoc2id(asoc);
|
460 |
|
|
|
461 |
|
|
return event;
|
462 |
|
|
|
463 |
|
|
fail:
|
464 |
|
|
return NULL;
|
465 |
|
|
}
|
466 |
|
|
|
467 |
|
|
/* Create and initialize a SCTP_SEND_FAILED notification.
|
468 |
|
|
*
|
469 |
|
|
* Socket Extensions for SCTP - draft-01
|
470 |
|
|
* 5.3.1.4 SCTP_SEND_FAILED
|
471 |
|
|
*/
|
472 |
|
|
struct sctp_ulpevent *sctp_ulpevent_make_send_failed(
|
473 |
|
|
const struct sctp_association *asoc, struct sctp_chunk *chunk,
|
474 |
|
|
__u16 flags, __u32 error, gfp_t gfp)
|
475 |
|
|
{
|
476 |
|
|
struct sctp_ulpevent *event;
|
477 |
|
|
struct sctp_send_failed *ssf;
|
478 |
|
|
struct sk_buff *skb;
|
479 |
|
|
|
480 |
|
|
/* Pull off any padding. */
|
481 |
|
|
int len = ntohs(chunk->chunk_hdr->length);
|
482 |
|
|
|
483 |
|
|
/* Make skb with more room so we can prepend notification. */
|
484 |
|
|
skb = skb_copy_expand(chunk->skb,
|
485 |
|
|
sizeof(struct sctp_send_failed), /* headroom */
|
486 |
|
|
0, /* tailroom */
|
487 |
|
|
gfp);
|
488 |
|
|
if (!skb)
|
489 |
|
|
goto fail;
|
490 |
|
|
|
491 |
|
|
/* Pull off the common chunk header and DATA header. */
|
492 |
|
|
skb_pull(skb, sizeof(struct sctp_data_chunk));
|
493 |
|
|
len -= sizeof(struct sctp_data_chunk);
|
494 |
|
|
|
495 |
|
|
/* Embed the event fields inside the cloned skb. */
|
496 |
|
|
event = sctp_skb2event(skb);
|
497 |
|
|
sctp_ulpevent_init(event, MSG_NOTIFICATION, skb->truesize);
|
498 |
|
|
|
499 |
|
|
ssf = (struct sctp_send_failed *)
|
500 |
|
|
skb_push(skb, sizeof(struct sctp_send_failed));
|
501 |
|
|
|
502 |
|
|
/* Socket Extensions for SCTP
|
503 |
|
|
* 5.3.1.4 SCTP_SEND_FAILED
|
504 |
|
|
*
|
505 |
|
|
* ssf_type:
|
506 |
|
|
* It should be SCTP_SEND_FAILED.
|
507 |
|
|
*/
|
508 |
|
|
ssf->ssf_type = SCTP_SEND_FAILED;
|
509 |
|
|
|
510 |
|
|
/* Socket Extensions for SCTP
|
511 |
|
|
* 5.3.1.4 SCTP_SEND_FAILED
|
512 |
|
|
*
|
513 |
|
|
* ssf_flags: 16 bits (unsigned integer)
|
514 |
|
|
* The flag value will take one of the following values
|
515 |
|
|
*
|
516 |
|
|
* SCTP_DATA_UNSENT - Indicates that the data was never put on
|
517 |
|
|
* the wire.
|
518 |
|
|
*
|
519 |
|
|
* SCTP_DATA_SENT - Indicates that the data was put on the wire.
|
520 |
|
|
* Note that this does not necessarily mean that the
|
521 |
|
|
* data was (or was not) successfully delivered.
|
522 |
|
|
*/
|
523 |
|
|
ssf->ssf_flags = flags;
|
524 |
|
|
|
525 |
|
|
/* Socket Extensions for SCTP
|
526 |
|
|
* 5.3.1.4 SCTP_SEND_FAILED
|
527 |
|
|
*
|
528 |
|
|
* ssf_length: sizeof (__u32)
|
529 |
|
|
* This field is the total length of the notification data, including
|
530 |
|
|
* the notification header.
|
531 |
|
|
*/
|
532 |
|
|
ssf->ssf_length = sizeof(struct sctp_send_failed) + len;
|
533 |
|
|
skb_trim(skb, ssf->ssf_length);
|
534 |
|
|
|
535 |
|
|
/* Socket Extensions for SCTP
|
536 |
|
|
* 5.3.1.4 SCTP_SEND_FAILED
|
537 |
|
|
*
|
538 |
|
|
* ssf_error: 16 bits (unsigned integer)
|
539 |
|
|
* This value represents the reason why the send failed, and if set,
|
540 |
|
|
* will be a SCTP protocol error code as defined in [SCTP] section
|
541 |
|
|
* 3.3.10.
|
542 |
|
|
*/
|
543 |
|
|
ssf->ssf_error = error;
|
544 |
|
|
|
545 |
|
|
/* Socket Extensions for SCTP
|
546 |
|
|
* 5.3.1.4 SCTP_SEND_FAILED
|
547 |
|
|
*
|
548 |
|
|
* ssf_info: sizeof (struct sctp_sndrcvinfo)
|
549 |
|
|
* The original send information associated with the undelivered
|
550 |
|
|
* message.
|
551 |
|
|
*/
|
552 |
|
|
memcpy(&ssf->ssf_info, &chunk->sinfo, sizeof(struct sctp_sndrcvinfo));
|
553 |
|
|
|
554 |
|
|
/* Per TSVWG discussion with Randy. Allow the application to
|
555 |
|
|
* ressemble a fragmented message.
|
556 |
|
|
*/
|
557 |
|
|
ssf->ssf_info.sinfo_flags = chunk->chunk_hdr->flags;
|
558 |
|
|
|
559 |
|
|
/* Socket Extensions for SCTP
|
560 |
|
|
* 5.3.1.4 SCTP_SEND_FAILED
|
561 |
|
|
*
|
562 |
|
|
* ssf_assoc_id: sizeof (sctp_assoc_t)
|
563 |
|
|
* The association id field, sf_assoc_id, holds the identifier for the
|
564 |
|
|
* association. All notifications for a given association have the
|
565 |
|
|
* same association identifier. For TCP style socket, this field is
|
566 |
|
|
* ignored.
|
567 |
|
|
*/
|
568 |
|
|
sctp_ulpevent_set_owner(event, asoc);
|
569 |
|
|
ssf->ssf_assoc_id = sctp_assoc2id(asoc);
|
570 |
|
|
return event;
|
571 |
|
|
|
572 |
|
|
fail:
|
573 |
|
|
return NULL;
|
574 |
|
|
}
|
575 |
|
|
|
576 |
|
|
/* Create and initialize a SCTP_SHUTDOWN_EVENT notification.
|
577 |
|
|
*
|
578 |
|
|
* Socket Extensions for SCTP - draft-01
|
579 |
|
|
* 5.3.1.5 SCTP_SHUTDOWN_EVENT
|
580 |
|
|
*/
|
581 |
|
|
struct sctp_ulpevent *sctp_ulpevent_make_shutdown_event(
|
582 |
|
|
const struct sctp_association *asoc,
|
583 |
|
|
__u16 flags, gfp_t gfp)
|
584 |
|
|
{
|
585 |
|
|
struct sctp_ulpevent *event;
|
586 |
|
|
struct sctp_shutdown_event *sse;
|
587 |
|
|
struct sk_buff *skb;
|
588 |
|
|
|
589 |
|
|
event = sctp_ulpevent_new(sizeof(struct sctp_shutdown_event),
|
590 |
|
|
MSG_NOTIFICATION, gfp);
|
591 |
|
|
if (!event)
|
592 |
|
|
goto fail;
|
593 |
|
|
|
594 |
|
|
skb = sctp_event2skb(event);
|
595 |
|
|
sse = (struct sctp_shutdown_event *)
|
596 |
|
|
skb_put(skb, sizeof(struct sctp_shutdown_event));
|
597 |
|
|
|
598 |
|
|
/* Socket Extensions for SCTP
|
599 |
|
|
* 5.3.1.5 SCTP_SHUTDOWN_EVENT
|
600 |
|
|
*
|
601 |
|
|
* sse_type
|
602 |
|
|
* It should be SCTP_SHUTDOWN_EVENT
|
603 |
|
|
*/
|
604 |
|
|
sse->sse_type = SCTP_SHUTDOWN_EVENT;
|
605 |
|
|
|
606 |
|
|
/* Socket Extensions for SCTP
|
607 |
|
|
* 5.3.1.5 SCTP_SHUTDOWN_EVENT
|
608 |
|
|
*
|
609 |
|
|
* sse_flags: 16 bits (unsigned integer)
|
610 |
|
|
* Currently unused.
|
611 |
|
|
*/
|
612 |
|
|
sse->sse_flags = 0;
|
613 |
|
|
|
614 |
|
|
/* Socket Extensions for SCTP
|
615 |
|
|
* 5.3.1.5 SCTP_SHUTDOWN_EVENT
|
616 |
|
|
*
|
617 |
|
|
* sse_length: sizeof (__u32)
|
618 |
|
|
* This field is the total length of the notification data, including
|
619 |
|
|
* the notification header.
|
620 |
|
|
*/
|
621 |
|
|
sse->sse_length = sizeof(struct sctp_shutdown_event);
|
622 |
|
|
|
623 |
|
|
/* Socket Extensions for SCTP
|
624 |
|
|
* 5.3.1.5 SCTP_SHUTDOWN_EVENT
|
625 |
|
|
*
|
626 |
|
|
* sse_assoc_id: sizeof (sctp_assoc_t)
|
627 |
|
|
* The association id field, holds the identifier for the association.
|
628 |
|
|
* All notifications for a given association have the same association
|
629 |
|
|
* identifier. For TCP style socket, this field is ignored.
|
630 |
|
|
*/
|
631 |
|
|
sctp_ulpevent_set_owner(event, asoc);
|
632 |
|
|
sse->sse_assoc_id = sctp_assoc2id(asoc);
|
633 |
|
|
|
634 |
|
|
return event;
|
635 |
|
|
|
636 |
|
|
fail:
|
637 |
|
|
return NULL;
|
638 |
|
|
}
|
639 |
|
|
|
640 |
|
|
/* Create and initialize a SCTP_ADAPTATION_INDICATION notification.
|
641 |
|
|
*
|
642 |
|
|
* Socket Extensions for SCTP
|
643 |
|
|
* 5.3.1.6 SCTP_ADAPTATION_INDICATION
|
644 |
|
|
*/
|
645 |
|
|
struct sctp_ulpevent *sctp_ulpevent_make_adaptation_indication(
|
646 |
|
|
const struct sctp_association *asoc, gfp_t gfp)
|
647 |
|
|
{
|
648 |
|
|
struct sctp_ulpevent *event;
|
649 |
|
|
struct sctp_adaptation_event *sai;
|
650 |
|
|
struct sk_buff *skb;
|
651 |
|
|
|
652 |
|
|
event = sctp_ulpevent_new(sizeof(struct sctp_adaptation_event),
|
653 |
|
|
MSG_NOTIFICATION, gfp);
|
654 |
|
|
if (!event)
|
655 |
|
|
goto fail;
|
656 |
|
|
|
657 |
|
|
skb = sctp_event2skb(event);
|
658 |
|
|
sai = (struct sctp_adaptation_event *)
|
659 |
|
|
skb_put(skb, sizeof(struct sctp_adaptation_event));
|
660 |
|
|
|
661 |
|
|
sai->sai_type = SCTP_ADAPTATION_INDICATION;
|
662 |
|
|
sai->sai_flags = 0;
|
663 |
|
|
sai->sai_length = sizeof(struct sctp_adaptation_event);
|
664 |
|
|
sai->sai_adaptation_ind = asoc->peer.adaptation_ind;
|
665 |
|
|
sctp_ulpevent_set_owner(event, asoc);
|
666 |
|
|
sai->sai_assoc_id = sctp_assoc2id(asoc);
|
667 |
|
|
|
668 |
|
|
return event;
|
669 |
|
|
|
670 |
|
|
fail:
|
671 |
|
|
return NULL;
|
672 |
|
|
}
|
673 |
|
|
|
674 |
|
|
/* A message has been received. Package this message as a notification
|
675 |
|
|
* to pass it to the upper layers. Go ahead and calculate the sndrcvinfo
|
676 |
|
|
* even if filtered out later.
|
677 |
|
|
*
|
678 |
|
|
* Socket Extensions for SCTP
|
679 |
|
|
* 5.2.2 SCTP Header Information Structure (SCTP_SNDRCV)
|
680 |
|
|
*/
|
681 |
|
|
struct sctp_ulpevent *sctp_ulpevent_make_rcvmsg(struct sctp_association *asoc,
|
682 |
|
|
struct sctp_chunk *chunk,
|
683 |
|
|
gfp_t gfp)
|
684 |
|
|
{
|
685 |
|
|
struct sctp_ulpevent *event = NULL;
|
686 |
|
|
struct sk_buff *skb;
|
687 |
|
|
size_t padding, len;
|
688 |
|
|
int rx_count;
|
689 |
|
|
|
690 |
|
|
/*
|
691 |
|
|
* check to see if we need to make space for this
|
692 |
|
|
* new skb, expand the rcvbuffer if needed, or drop
|
693 |
|
|
* the frame
|
694 |
|
|
*/
|
695 |
|
|
if (asoc->ep->rcvbuf_policy)
|
696 |
|
|
rx_count = atomic_read(&asoc->rmem_alloc);
|
697 |
|
|
else
|
698 |
|
|
rx_count = atomic_read(&asoc->base.sk->sk_rmem_alloc);
|
699 |
|
|
|
700 |
|
|
if (rx_count >= asoc->base.sk->sk_rcvbuf) {
|
701 |
|
|
|
702 |
|
|
if ((asoc->base.sk->sk_userlocks & SOCK_RCVBUF_LOCK) ||
|
703 |
|
|
(!sk_stream_rmem_schedule(asoc->base.sk, chunk->skb)))
|
704 |
|
|
goto fail;
|
705 |
|
|
}
|
706 |
|
|
|
707 |
|
|
/* Clone the original skb, sharing the data. */
|
708 |
|
|
skb = skb_clone(chunk->skb, gfp);
|
709 |
|
|
if (!skb)
|
710 |
|
|
goto fail;
|
711 |
|
|
|
712 |
|
|
/* First calculate the padding, so we don't inadvertently
|
713 |
|
|
* pass up the wrong length to the user.
|
714 |
|
|
*
|
715 |
|
|
* RFC 2960 - Section 3.2 Chunk Field Descriptions
|
716 |
|
|
*
|
717 |
|
|
* The total length of a chunk(including Type, Length and Value fields)
|
718 |
|
|
* MUST be a multiple of 4 bytes. If the length of the chunk is not a
|
719 |
|
|
* multiple of 4 bytes, the sender MUST pad the chunk with all zero
|
720 |
|
|
* bytes and this padding is not included in the chunk length field.
|
721 |
|
|
* The sender should never pad with more than 3 bytes. The receiver
|
722 |
|
|
* MUST ignore the padding bytes.
|
723 |
|
|
*/
|
724 |
|
|
len = ntohs(chunk->chunk_hdr->length);
|
725 |
|
|
padding = WORD_ROUND(len) - len;
|
726 |
|
|
|
727 |
|
|
/* Fixup cloned skb with just this chunks data. */
|
728 |
|
|
skb_trim(skb, chunk->chunk_end - padding - skb->data);
|
729 |
|
|
|
730 |
|
|
/* Embed the event fields inside the cloned skb. */
|
731 |
|
|
event = sctp_skb2event(skb);
|
732 |
|
|
|
733 |
|
|
/* Initialize event with flags 0 and correct length
|
734 |
|
|
* Since this is a clone of the original skb, only account for
|
735 |
|
|
* the data of this chunk as other chunks will be accounted separately.
|
736 |
|
|
*/
|
737 |
|
|
sctp_ulpevent_init(event, 0, skb->len + sizeof(struct sk_buff));
|
738 |
|
|
|
739 |
|
|
sctp_ulpevent_receive_data(event, asoc);
|
740 |
|
|
|
741 |
|
|
event->stream = ntohs(chunk->subh.data_hdr->stream);
|
742 |
|
|
event->ssn = ntohs(chunk->subh.data_hdr->ssn);
|
743 |
|
|
event->ppid = chunk->subh.data_hdr->ppid;
|
744 |
|
|
if (chunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) {
|
745 |
|
|
event->flags |= SCTP_UNORDERED;
|
746 |
|
|
event->cumtsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map);
|
747 |
|
|
}
|
748 |
|
|
event->tsn = ntohl(chunk->subh.data_hdr->tsn);
|
749 |
|
|
event->msg_flags |= chunk->chunk_hdr->flags;
|
750 |
|
|
event->iif = sctp_chunk_iif(chunk);
|
751 |
|
|
|
752 |
|
|
fail:
|
753 |
|
|
return event;
|
754 |
|
|
}
|
755 |
|
|
|
756 |
|
|
/* Create a partial delivery related event.
|
757 |
|
|
*
|
758 |
|
|
* 5.3.1.7 SCTP_PARTIAL_DELIVERY_EVENT
|
759 |
|
|
*
|
760 |
|
|
* When a receiver is engaged in a partial delivery of a
|
761 |
|
|
* message this notification will be used to indicate
|
762 |
|
|
* various events.
|
763 |
|
|
*/
|
764 |
|
|
struct sctp_ulpevent *sctp_ulpevent_make_pdapi(
|
765 |
|
|
const struct sctp_association *asoc, __u32 indication,
|
766 |
|
|
gfp_t gfp)
|
767 |
|
|
{
|
768 |
|
|
struct sctp_ulpevent *event;
|
769 |
|
|
struct sctp_pdapi_event *pd;
|
770 |
|
|
struct sk_buff *skb;
|
771 |
|
|
|
772 |
|
|
event = sctp_ulpevent_new(sizeof(struct sctp_pdapi_event),
|
773 |
|
|
MSG_NOTIFICATION, gfp);
|
774 |
|
|
if (!event)
|
775 |
|
|
goto fail;
|
776 |
|
|
|
777 |
|
|
skb = sctp_event2skb(event);
|
778 |
|
|
pd = (struct sctp_pdapi_event *)
|
779 |
|
|
skb_put(skb, sizeof(struct sctp_pdapi_event));
|
780 |
|
|
|
781 |
|
|
/* pdapi_type
|
782 |
|
|
* It should be SCTP_PARTIAL_DELIVERY_EVENT
|
783 |
|
|
*
|
784 |
|
|
* pdapi_flags: 16 bits (unsigned integer)
|
785 |
|
|
* Currently unused.
|
786 |
|
|
*/
|
787 |
|
|
pd->pdapi_type = SCTP_PARTIAL_DELIVERY_EVENT;
|
788 |
|
|
pd->pdapi_flags = 0;
|
789 |
|
|
|
790 |
|
|
/* pdapi_length: 32 bits (unsigned integer)
|
791 |
|
|
*
|
792 |
|
|
* This field is the total length of the notification data, including
|
793 |
|
|
* the notification header. It will generally be sizeof (struct
|
794 |
|
|
* sctp_pdapi_event).
|
795 |
|
|
*/
|
796 |
|
|
pd->pdapi_length = sizeof(struct sctp_pdapi_event);
|
797 |
|
|
|
798 |
|
|
/* pdapi_indication: 32 bits (unsigned integer)
|
799 |
|
|
*
|
800 |
|
|
* This field holds the indication being sent to the application.
|
801 |
|
|
*/
|
802 |
|
|
pd->pdapi_indication = indication;
|
803 |
|
|
|
804 |
|
|
/* pdapi_assoc_id: sizeof (sctp_assoc_t)
|
805 |
|
|
*
|
806 |
|
|
* The association id field, holds the identifier for the association.
|
807 |
|
|
*/
|
808 |
|
|
sctp_ulpevent_set_owner(event, asoc);
|
809 |
|
|
pd->pdapi_assoc_id = sctp_assoc2id(asoc);
|
810 |
|
|
|
811 |
|
|
return event;
|
812 |
|
|
fail:
|
813 |
|
|
return NULL;
|
814 |
|
|
}
|
815 |
|
|
|
816 |
|
|
struct sctp_ulpevent *sctp_ulpevent_make_authkey(
|
817 |
|
|
const struct sctp_association *asoc, __u16 key_id,
|
818 |
|
|
__u32 indication, gfp_t gfp)
|
819 |
|
|
{
|
820 |
|
|
struct sctp_ulpevent *event;
|
821 |
|
|
struct sctp_authkey_event *ak;
|
822 |
|
|
struct sk_buff *skb;
|
823 |
|
|
|
824 |
|
|
event = sctp_ulpevent_new(sizeof(struct sctp_authkey_event),
|
825 |
|
|
MSG_NOTIFICATION, gfp);
|
826 |
|
|
if (!event)
|
827 |
|
|
goto fail;
|
828 |
|
|
|
829 |
|
|
skb = sctp_event2skb(event);
|
830 |
|
|
ak = (struct sctp_authkey_event *)
|
831 |
|
|
skb_put(skb, sizeof(struct sctp_authkey_event));
|
832 |
|
|
|
833 |
|
|
ak->auth_type = SCTP_AUTHENTICATION_INDICATION;
|
834 |
|
|
ak->auth_flags = 0;
|
835 |
|
|
ak->auth_length = sizeof(struct sctp_authkey_event);
|
836 |
|
|
|
837 |
|
|
ak->auth_keynumber = key_id;
|
838 |
|
|
ak->auth_altkeynumber = 0;
|
839 |
|
|
ak->auth_indication = indication;
|
840 |
|
|
|
841 |
|
|
/*
|
842 |
|
|
* The association id field, holds the identifier for the association.
|
843 |
|
|
*/
|
844 |
|
|
sctp_ulpevent_set_owner(event, asoc);
|
845 |
|
|
ak->auth_assoc_id = sctp_assoc2id(asoc);
|
846 |
|
|
|
847 |
|
|
return event;
|
848 |
|
|
fail:
|
849 |
|
|
return NULL;
|
850 |
|
|
}
|
851 |
|
|
|
852 |
|
|
|
853 |
|
|
/* Return the notification type, assuming this is a notification
|
854 |
|
|
* event.
|
855 |
|
|
*/
|
856 |
|
|
__u16 sctp_ulpevent_get_notification_type(const struct sctp_ulpevent *event)
|
857 |
|
|
{
|
858 |
|
|
union sctp_notification *notification;
|
859 |
|
|
struct sk_buff *skb;
|
860 |
|
|
|
861 |
|
|
skb = sctp_event2skb((struct sctp_ulpevent *)event);
|
862 |
|
|
notification = (union sctp_notification *) skb->data;
|
863 |
|
|
return notification->sn_header.sn_type;
|
864 |
|
|
}
|
865 |
|
|
|
866 |
|
|
/* Copy out the sndrcvinfo into a msghdr. */
|
867 |
|
|
void sctp_ulpevent_read_sndrcvinfo(const struct sctp_ulpevent *event,
|
868 |
|
|
struct msghdr *msghdr)
|
869 |
|
|
{
|
870 |
|
|
struct sctp_sndrcvinfo sinfo;
|
871 |
|
|
|
872 |
|
|
if (sctp_ulpevent_is_notification(event))
|
873 |
|
|
return;
|
874 |
|
|
|
875 |
|
|
/* Sockets API Extensions for SCTP
|
876 |
|
|
* Section 5.2.2 SCTP Header Information Structure (SCTP_SNDRCV)
|
877 |
|
|
*
|
878 |
|
|
* sinfo_stream: 16 bits (unsigned integer)
|
879 |
|
|
*
|
880 |
|
|
* For recvmsg() the SCTP stack places the message's stream number in
|
881 |
|
|
* this value.
|
882 |
|
|
*/
|
883 |
|
|
sinfo.sinfo_stream = event->stream;
|
884 |
|
|
/* sinfo_ssn: 16 bits (unsigned integer)
|
885 |
|
|
*
|
886 |
|
|
* For recvmsg() this value contains the stream sequence number that
|
887 |
|
|
* the remote endpoint placed in the DATA chunk. For fragmented
|
888 |
|
|
* messages this is the same number for all deliveries of the message
|
889 |
|
|
* (if more than one recvmsg() is needed to read the message).
|
890 |
|
|
*/
|
891 |
|
|
sinfo.sinfo_ssn = event->ssn;
|
892 |
|
|
/* sinfo_ppid: 32 bits (unsigned integer)
|
893 |
|
|
*
|
894 |
|
|
* In recvmsg() this value is
|
895 |
|
|
* the same information that was passed by the upper layer in the peer
|
896 |
|
|
* application. Please note that byte order issues are NOT accounted
|
897 |
|
|
* for and this information is passed opaquely by the SCTP stack from
|
898 |
|
|
* one end to the other.
|
899 |
|
|
*/
|
900 |
|
|
sinfo.sinfo_ppid = event->ppid;
|
901 |
|
|
/* sinfo_flags: 16 bits (unsigned integer)
|
902 |
|
|
*
|
903 |
|
|
* This field may contain any of the following flags and is composed of
|
904 |
|
|
* a bitwise OR of these values.
|
905 |
|
|
*
|
906 |
|
|
* recvmsg() flags:
|
907 |
|
|
*
|
908 |
|
|
* SCTP_UNORDERED - This flag is present when the message was sent
|
909 |
|
|
* non-ordered.
|
910 |
|
|
*/
|
911 |
|
|
sinfo.sinfo_flags = event->flags;
|
912 |
|
|
/* sinfo_tsn: 32 bit (unsigned integer)
|
913 |
|
|
*
|
914 |
|
|
* For the receiving side, this field holds a TSN that was
|
915 |
|
|
* assigned to one of the SCTP Data Chunks.
|
916 |
|
|
*/
|
917 |
|
|
sinfo.sinfo_tsn = event->tsn;
|
918 |
|
|
/* sinfo_cumtsn: 32 bit (unsigned integer)
|
919 |
|
|
*
|
920 |
|
|
* This field will hold the current cumulative TSN as
|
921 |
|
|
* known by the underlying SCTP layer. Note this field is
|
922 |
|
|
* ignored when sending and only valid for a receive
|
923 |
|
|
* operation when sinfo_flags are set to SCTP_UNORDERED.
|
924 |
|
|
*/
|
925 |
|
|
sinfo.sinfo_cumtsn = event->cumtsn;
|
926 |
|
|
/* sinfo_assoc_id: sizeof (sctp_assoc_t)
|
927 |
|
|
*
|
928 |
|
|
* The association handle field, sinfo_assoc_id, holds the identifier
|
929 |
|
|
* for the association announced in the COMMUNICATION_UP notification.
|
930 |
|
|
* All notifications for a given association have the same identifier.
|
931 |
|
|
* Ignored for one-to-one style sockets.
|
932 |
|
|
*/
|
933 |
|
|
sinfo.sinfo_assoc_id = sctp_assoc2id(event->asoc);
|
934 |
|
|
|
935 |
|
|
/* context value that is set via SCTP_CONTEXT socket option. */
|
936 |
|
|
sinfo.sinfo_context = event->asoc->default_rcv_context;
|
937 |
|
|
|
938 |
|
|
/* These fields are not used while receiving. */
|
939 |
|
|
sinfo.sinfo_timetolive = 0;
|
940 |
|
|
|
941 |
|
|
put_cmsg(msghdr, IPPROTO_SCTP, SCTP_SNDRCV,
|
942 |
|
|
sizeof(struct sctp_sndrcvinfo), (void *)&sinfo);
|
943 |
|
|
}
|
944 |
|
|
|
945 |
|
|
/* Do accounting for bytes received and hold a reference to the association
|
946 |
|
|
* for each skb.
|
947 |
|
|
*/
|
948 |
|
|
static void sctp_ulpevent_receive_data(struct sctp_ulpevent *event,
|
949 |
|
|
struct sctp_association *asoc)
|
950 |
|
|
{
|
951 |
|
|
struct sk_buff *skb, *frag;
|
952 |
|
|
|
953 |
|
|
skb = sctp_event2skb(event);
|
954 |
|
|
/* Set the owner and charge rwnd for bytes received. */
|
955 |
|
|
sctp_ulpevent_set_owner(event, asoc);
|
956 |
|
|
sctp_assoc_rwnd_decrease(asoc, skb_headlen(skb));
|
957 |
|
|
|
958 |
|
|
if (!skb->data_len)
|
959 |
|
|
return;
|
960 |
|
|
|
961 |
|
|
/* Note: Not clearing the entire event struct as this is just a
|
962 |
|
|
* fragment of the real event. However, we still need to do rwnd
|
963 |
|
|
* accounting.
|
964 |
|
|
* In general, the skb passed from IP can have only 1 level of
|
965 |
|
|
* fragments. But we allow multiple levels of fragments.
|
966 |
|
|
*/
|
967 |
|
|
for (frag = skb_shinfo(skb)->frag_list; frag; frag = frag->next) {
|
968 |
|
|
sctp_ulpevent_receive_data(sctp_skb2event(frag), asoc);
|
969 |
|
|
}
|
970 |
|
|
}
|
971 |
|
|
|
972 |
|
|
/* Do accounting for bytes just read by user and release the references to
|
973 |
|
|
* the association.
|
974 |
|
|
*/
|
975 |
|
|
static void sctp_ulpevent_release_data(struct sctp_ulpevent *event)
|
976 |
|
|
{
|
977 |
|
|
struct sk_buff *skb, *frag;
|
978 |
|
|
unsigned int len;
|
979 |
|
|
|
980 |
|
|
/* Current stack structures assume that the rcv buffer is
|
981 |
|
|
* per socket. For UDP style sockets this is not true as
|
982 |
|
|
* multiple associations may be on a single UDP-style socket.
|
983 |
|
|
* Use the local private area of the skb to track the owning
|
984 |
|
|
* association.
|
985 |
|
|
*/
|
986 |
|
|
|
987 |
|
|
skb = sctp_event2skb(event);
|
988 |
|
|
len = skb->len;
|
989 |
|
|
|
990 |
|
|
if (!skb->data_len)
|
991 |
|
|
goto done;
|
992 |
|
|
|
993 |
|
|
/* Don't forget the fragments. */
|
994 |
|
|
for (frag = skb_shinfo(skb)->frag_list; frag; frag = frag->next) {
|
995 |
|
|
/* NOTE: skb_shinfos are recursive. Although IP returns
|
996 |
|
|
* skb's with only 1 level of fragments, SCTP reassembly can
|
997 |
|
|
* increase the levels.
|
998 |
|
|
*/
|
999 |
|
|
sctp_ulpevent_release_frag_data(sctp_skb2event(frag));
|
1000 |
|
|
}
|
1001 |
|
|
|
1002 |
|
|
done:
|
1003 |
|
|
sctp_assoc_rwnd_increase(event->asoc, len);
|
1004 |
|
|
sctp_ulpevent_release_owner(event);
|
1005 |
|
|
}
|
1006 |
|
|
|
1007 |
|
|
static void sctp_ulpevent_release_frag_data(struct sctp_ulpevent *event)
|
1008 |
|
|
{
|
1009 |
|
|
struct sk_buff *skb, *frag;
|
1010 |
|
|
|
1011 |
|
|
skb = sctp_event2skb(event);
|
1012 |
|
|
|
1013 |
|
|
if (!skb->data_len)
|
1014 |
|
|
goto done;
|
1015 |
|
|
|
1016 |
|
|
/* Don't forget the fragments. */
|
1017 |
|
|
for (frag = skb_shinfo(skb)->frag_list; frag; frag = frag->next) {
|
1018 |
|
|
/* NOTE: skb_shinfos are recursive. Although IP returns
|
1019 |
|
|
* skb's with only 1 level of fragments, SCTP reassembly can
|
1020 |
|
|
* increase the levels.
|
1021 |
|
|
*/
|
1022 |
|
|
sctp_ulpevent_release_frag_data(sctp_skb2event(frag));
|
1023 |
|
|
}
|
1024 |
|
|
|
1025 |
|
|
done:
|
1026 |
|
|
sctp_ulpevent_release_owner(event);
|
1027 |
|
|
}
|
1028 |
|
|
|
1029 |
|
|
/* Free a ulpevent that has an owner. It includes releasing the reference
|
1030 |
|
|
* to the owner, updating the rwnd in case of a DATA event and freeing the
|
1031 |
|
|
* skb.
|
1032 |
|
|
*/
|
1033 |
|
|
void sctp_ulpevent_free(struct sctp_ulpevent *event)
|
1034 |
|
|
{
|
1035 |
|
|
if (sctp_ulpevent_is_notification(event))
|
1036 |
|
|
sctp_ulpevent_release_owner(event);
|
1037 |
|
|
else
|
1038 |
|
|
sctp_ulpevent_release_data(event);
|
1039 |
|
|
|
1040 |
|
|
kfree_skb(sctp_event2skb(event));
|
1041 |
|
|
}
|
1042 |
|
|
|
1043 |
|
|
/* Purge the skb lists holding ulpevents. */
|
1044 |
|
|
void sctp_queue_purge_ulpevents(struct sk_buff_head *list)
|
1045 |
|
|
{
|
1046 |
|
|
struct sk_buff *skb;
|
1047 |
|
|
while ((skb = skb_dequeue(list)) != NULL)
|
1048 |
|
|
sctp_ulpevent_free(sctp_skb2event(skb));
|
1049 |
|
|
}
|