mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-06 02:16:39 +07:00
d808ad9ab8
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org> Signed-off-by: David S. Miller <davem@davemloft.net>
967 lines
27 KiB
C
967 lines
27 KiB
C
/* 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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#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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/* 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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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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* has either begun or ended. The identifier for a new association is
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* provided by this notification.
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*
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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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*/
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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, gfp_t gfp)
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{
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struct sctp_ulpevent *event;
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struct sctp_assoc_change *sac;
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struct sk_buff *skb;
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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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skb = sctp_event2skb(event);
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sac = (struct sctp_assoc_change *)
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skb_put(skb, sizeof(struct sctp_assoc_change));
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/* Socket Extensions for SCTP
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* 5.3.1.1 SCTP_ASSOC_CHANGE
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*
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* sac_type:
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* It should be SCTP_ASSOC_CHANGE.
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*/
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sac->sac_type = SCTP_ASSOC_CHANGE;
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/* Socket Extensions for SCTP
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* 5.3.1.1 SCTP_ASSOC_CHANGE
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*
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* sac_state: 32 bits (signed integer)
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* This field holds one of a number of values that communicate the
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* event that happened to the association.
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*/
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sac->sac_state = state;
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/* Socket Extensions for SCTP
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* 5.3.1.1 SCTP_ASSOC_CHANGE
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*
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* sac_flags: 16 bits (unsigned integer)
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* Currently unused.
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*/
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sac->sac_flags = 0;
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/* Socket Extensions for SCTP
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* 5.3.1.1 SCTP_ASSOC_CHANGE
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*
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* sac_length: sizeof (__u32)
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* This field is the total length of the notification data, including
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* the notification header.
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*/
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sac->sac_length = sizeof(struct sctp_assoc_change);
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/* Socket Extensions for SCTP
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* 5.3.1.1 SCTP_ASSOC_CHANGE
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*
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* sac_error: 32 bits (signed integer)
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*
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* If the state was reached due to a error condition (e.g.
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* COMMUNICATION_LOST) any relevant error information is available in
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* this field. This corresponds to the protocol error codes defined in
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* [SCTP].
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*/
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sac->sac_error = error;
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/* Socket Extensions for SCTP
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* 5.3.1.1 SCTP_ASSOC_CHANGE
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*
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* sac_outbound_streams: 16 bits (unsigned integer)
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* sac_inbound_streams: 16 bits (unsigned integer)
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*
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* The maximum number of streams allowed in each direction are
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* available in sac_outbound_streams and sac_inbound streams.
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*/
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sac->sac_outbound_streams = outbound;
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sac->sac_inbound_streams = inbound;
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/* Socket Extensions for SCTP
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* 5.3.1.1 SCTP_ASSOC_CHANGE
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*
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* sac_assoc_id: sizeof (sctp_assoc_t)
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*
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* The association id field, holds the identifier for the association.
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* All notifications for a given association have the same association
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* identifier. For TCP style socket, this field is ignored.
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*/
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sctp_ulpevent_set_owner(event, asoc);
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sac->sac_assoc_id = sctp_assoc2id(asoc);
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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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/* Create and initialize an SCTP_PEER_ADDR_CHANGE event.
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*
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* Socket Extensions for SCTP - draft-01
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* 5.3.1.2 SCTP_PEER_ADDR_CHANGE
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*
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* When a destination address on a multi-homed peer encounters a change
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* an interface details event is sent.
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*/
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struct sctp_ulpevent *sctp_ulpevent_make_peer_addr_change(
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const struct sctp_association *asoc,
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const struct sockaddr_storage *aaddr,
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int flags, int state, int error, gfp_t gfp)
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{
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struct sctp_ulpevent *event;
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struct sctp_paddr_change *spc;
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struct sk_buff *skb;
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event = sctp_ulpevent_new(sizeof(struct sctp_paddr_change),
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MSG_NOTIFICATION, gfp);
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if (!event)
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goto fail;
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skb = sctp_event2skb(event);
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spc = (struct sctp_paddr_change *)
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skb_put(skb, sizeof(struct sctp_paddr_change));
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/* Sockets API Extensions for SCTP
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* Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE
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*
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* spc_type:
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*
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* It should be SCTP_PEER_ADDR_CHANGE.
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*/
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spc->spc_type = SCTP_PEER_ADDR_CHANGE;
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/* Sockets API Extensions for SCTP
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* Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE
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*
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* spc_length: sizeof (__u32)
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*
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* This field is the total length of the notification data, including
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* the notification header.
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*/
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spc->spc_length = sizeof(struct sctp_paddr_change);
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/* Sockets API Extensions for SCTP
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* Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE
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*
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* spc_flags: 16 bits (unsigned integer)
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* Currently unused.
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*/
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spc->spc_flags = 0;
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/* Sockets API Extensions for SCTP
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* Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE
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*
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* spc_state: 32 bits (signed integer)
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*
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* This field holds one of a number of values that communicate the
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* event that happened to the address.
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*/
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spc->spc_state = state;
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/* Sockets API Extensions for SCTP
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* Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE
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*
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* spc_error: 32 bits (signed integer)
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*
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* If the state was reached due to any error condition (e.g.
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* ADDRESS_UNREACHABLE) any relevant error information is available in
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* this field.
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*/
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spc->spc_error = error;
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/* Socket Extensions for SCTP
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* 5.3.1.1 SCTP_ASSOC_CHANGE
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*
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* spc_assoc_id: sizeof (sctp_assoc_t)
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*
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* The association id field, holds the identifier for the association.
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* All notifications for a given association have the same association
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* identifier. For TCP style socket, this field is ignored.
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*/
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sctp_ulpevent_set_owner(event, asoc);
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spc->spc_assoc_id = sctp_assoc2id(asoc);
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/* Sockets API Extensions for SCTP
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* Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE
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*
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* spc_aaddr: sizeof (struct sockaddr_storage)
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*
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* The affected address field, holds the remote peer's address that is
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* encountering the change of state.
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*/
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memcpy(&spc->spc_aaddr, aaddr, sizeof(struct sockaddr_storage));
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/* Map ipv4 address into v4-mapped-on-v6 address. */
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sctp_get_pf_specific(asoc->base.sk->sk_family)->addr_v4map(
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sctp_sk(asoc->base.sk),
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(union sctp_addr *)&spc->spc_aaddr);
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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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/* Create and initialize an SCTP_REMOTE_ERROR notification.
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*
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* Note: This assumes that the chunk->skb->data already points to the
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* operation error payload.
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*
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* Socket Extensions for SCTP - draft-01
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* 5.3.1.3 SCTP_REMOTE_ERROR
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*
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* A remote peer may send an Operational Error message to its peer.
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* This message indicates a variety of error conditions on an
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* association. The entire error TLV as it appears on the wire is
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* included in a SCTP_REMOTE_ERROR event. Please refer to the SCTP
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* specification [SCTP] and any extensions for a list of possible
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* error formats.
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*/
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struct sctp_ulpevent *sctp_ulpevent_make_remote_error(
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const struct sctp_association *asoc, struct sctp_chunk *chunk,
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__u16 flags, gfp_t gfp)
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{
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struct sctp_ulpevent *event;
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struct sctp_remote_error *sre;
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struct sk_buff *skb;
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sctp_errhdr_t *ch;
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__be16 cause;
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int elen;
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ch = (sctp_errhdr_t *)(chunk->skb->data);
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cause = ch->cause;
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elen = WORD_ROUND(ntohs(ch->length)) - sizeof(sctp_errhdr_t);
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/* Pull off the ERROR header. */
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skb_pull(chunk->skb, sizeof(sctp_errhdr_t));
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/* Copy the skb to a new skb with room for us to prepend
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* notification with.
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*/
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skb = skb_copy_expand(chunk->skb, sizeof(struct sctp_remote_error),
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0, gfp);
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/* Pull off the rest of the cause TLV from the chunk. */
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skb_pull(chunk->skb, elen);
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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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sre = (struct sctp_remote_error *)
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skb_push(skb, sizeof(struct sctp_remote_error));
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/* Trim the buffer to the right length. */
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skb_trim(skb, sizeof(struct sctp_remote_error) + elen);
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/* Socket Extensions for SCTP
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* 5.3.1.3 SCTP_REMOTE_ERROR
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*
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* sre_type:
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* It should be SCTP_REMOTE_ERROR.
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*/
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sre->sre_type = SCTP_REMOTE_ERROR;
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/*
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* Socket Extensions for SCTP
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* 5.3.1.3 SCTP_REMOTE_ERROR
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*
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* sre_flags: 16 bits (unsigned integer)
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* Currently unused.
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*/
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sre->sre_flags = 0;
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/* Socket Extensions for SCTP
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* 5.3.1.3 SCTP_REMOTE_ERROR
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*
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* sre_length: sizeof (__u32)
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*
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* This field is the total length of the notification data,
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* including the notification header.
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*/
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sre->sre_length = skb->len;
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/* Socket Extensions for SCTP
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* 5.3.1.3 SCTP_REMOTE_ERROR
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*
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* sre_error: 16 bits (unsigned integer)
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* This value represents one of the Operational Error causes defined in
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* the SCTP specification, in network byte order.
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*/
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sre->sre_error = cause;
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/* Socket Extensions for SCTP
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* 5.3.1.3 SCTP_REMOTE_ERROR
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*
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* sre_assoc_id: sizeof (sctp_assoc_t)
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*
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* The association id field, holds the identifier for the association.
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* All notifications for a given association have the same association
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* identifier. For TCP style socket, this field is ignored.
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*/
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sctp_ulpevent_set_owner(event, asoc);
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sre->sre_assoc_id = sctp_assoc2id(asoc);
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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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/* Create and initialize a SCTP_SEND_FAILED notification.
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*
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* Socket Extensions for SCTP - draft-01
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* 5.3.1.4 SCTP_SEND_FAILED
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*/
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struct sctp_ulpevent *sctp_ulpevent_make_send_failed(
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const struct sctp_association *asoc, struct sctp_chunk *chunk,
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__u16 flags, __u32 error, gfp_t gfp)
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{
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struct sctp_ulpevent *event;
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struct sctp_send_failed *ssf;
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struct sk_buff *skb;
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/* Pull off any padding. */
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int len = ntohs(chunk->chunk_hdr->length);
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/* Make skb with more room so we can prepend notification. */
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skb = skb_copy_expand(chunk->skb,
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sizeof(struct sctp_send_failed), /* headroom */
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0, /* tailroom */
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gfp);
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if (!skb)
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goto fail;
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/* Pull off the common chunk header and DATA header. */
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skb_pull(skb, sizeof(struct sctp_data_chunk));
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len -= sizeof(struct sctp_data_chunk);
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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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ssf = (struct sctp_send_failed *)
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skb_push(skb, sizeof(struct sctp_send_failed));
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/* Socket Extensions for SCTP
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* 5.3.1.4 SCTP_SEND_FAILED
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*
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* ssf_type:
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* It should be SCTP_SEND_FAILED.
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*/
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ssf->ssf_type = SCTP_SEND_FAILED;
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/* Socket Extensions for SCTP
|
|
* 5.3.1.4 SCTP_SEND_FAILED
|
|
*
|
|
* ssf_flags: 16 bits (unsigned integer)
|
|
* The flag value will take one of the following values
|
|
*
|
|
* SCTP_DATA_UNSENT - Indicates that the data was never put on
|
|
* the wire.
|
|
*
|
|
* SCTP_DATA_SENT - Indicates that the data was put on the wire.
|
|
* Note that this does not necessarily mean that the
|
|
* data was (or was not) successfully delivered.
|
|
*/
|
|
ssf->ssf_flags = flags;
|
|
|
|
/* Socket Extensions for SCTP
|
|
* 5.3.1.4 SCTP_SEND_FAILED
|
|
*
|
|
* ssf_length: sizeof (__u32)
|
|
* This field is the total length of the notification data, including
|
|
* the notification header.
|
|
*/
|
|
ssf->ssf_length = sizeof(struct sctp_send_failed) + len;
|
|
skb_trim(skb, ssf->ssf_length);
|
|
|
|
/* Socket Extensions for SCTP
|
|
* 5.3.1.4 SCTP_SEND_FAILED
|
|
*
|
|
* ssf_error: 16 bits (unsigned integer)
|
|
* This value represents the reason why the send failed, and if set,
|
|
* will be a SCTP protocol error code as defined in [SCTP] section
|
|
* 3.3.10.
|
|
*/
|
|
ssf->ssf_error = error;
|
|
|
|
/* Socket Extensions for SCTP
|
|
* 5.3.1.4 SCTP_SEND_FAILED
|
|
*
|
|
* ssf_info: sizeof (struct sctp_sndrcvinfo)
|
|
* The original send information associated with the undelivered
|
|
* message.
|
|
*/
|
|
memcpy(&ssf->ssf_info, &chunk->sinfo, sizeof(struct sctp_sndrcvinfo));
|
|
|
|
/* Per TSVWG discussion with Randy. Allow the application to
|
|
* ressemble a fragmented message.
|
|
*/
|
|
ssf->ssf_info.sinfo_flags = chunk->chunk_hdr->flags;
|
|
|
|
/* Socket Extensions for SCTP
|
|
* 5.3.1.4 SCTP_SEND_FAILED
|
|
*
|
|
* ssf_assoc_id: sizeof (sctp_assoc_t)
|
|
* The association id field, sf_assoc_id, holds the identifier for the
|
|
* association. All notifications for a given association have the
|
|
* same association identifier. For TCP style socket, this field is
|
|
* ignored.
|
|
*/
|
|
sctp_ulpevent_set_owner(event, asoc);
|
|
ssf->ssf_assoc_id = sctp_assoc2id(asoc);
|
|
return event;
|
|
|
|
fail:
|
|
return NULL;
|
|
}
|
|
|
|
/* Create and initialize a SCTP_SHUTDOWN_EVENT notification.
|
|
*
|
|
* Socket Extensions for SCTP - draft-01
|
|
* 5.3.1.5 SCTP_SHUTDOWN_EVENT
|
|
*/
|
|
struct sctp_ulpevent *sctp_ulpevent_make_shutdown_event(
|
|
const struct sctp_association *asoc,
|
|
__u16 flags, gfp_t gfp)
|
|
{
|
|
struct sctp_ulpevent *event;
|
|
struct sctp_shutdown_event *sse;
|
|
struct sk_buff *skb;
|
|
|
|
event = sctp_ulpevent_new(sizeof(struct sctp_shutdown_event),
|
|
MSG_NOTIFICATION, gfp);
|
|
if (!event)
|
|
goto fail;
|
|
|
|
skb = sctp_event2skb(event);
|
|
sse = (struct sctp_shutdown_event *)
|
|
skb_put(skb, sizeof(struct sctp_shutdown_event));
|
|
|
|
/* Socket Extensions for SCTP
|
|
* 5.3.1.5 SCTP_SHUTDOWN_EVENT
|
|
*
|
|
* sse_type
|
|
* It should be SCTP_SHUTDOWN_EVENT
|
|
*/
|
|
sse->sse_type = SCTP_SHUTDOWN_EVENT;
|
|
|
|
/* Socket Extensions for SCTP
|
|
* 5.3.1.5 SCTP_SHUTDOWN_EVENT
|
|
*
|
|
* sse_flags: 16 bits (unsigned integer)
|
|
* Currently unused.
|
|
*/
|
|
sse->sse_flags = 0;
|
|
|
|
/* Socket Extensions for SCTP
|
|
* 5.3.1.5 SCTP_SHUTDOWN_EVENT
|
|
*
|
|
* sse_length: sizeof (__u32)
|
|
* This field is the total length of the notification data, including
|
|
* the notification header.
|
|
*/
|
|
sse->sse_length = sizeof(struct sctp_shutdown_event);
|
|
|
|
/* Socket Extensions for SCTP
|
|
* 5.3.1.5 SCTP_SHUTDOWN_EVENT
|
|
*
|
|
* sse_assoc_id: sizeof (sctp_assoc_t)
|
|
* The association id field, holds the identifier for the association.
|
|
* All notifications for a given association have the same association
|
|
* identifier. For TCP style socket, this field is ignored.
|
|
*/
|
|
sctp_ulpevent_set_owner(event, asoc);
|
|
sse->sse_assoc_id = sctp_assoc2id(asoc);
|
|
|
|
return event;
|
|
|
|
fail:
|
|
return NULL;
|
|
}
|
|
|
|
/* Create and initialize a SCTP_ADAPTATION_INDICATION notification.
|
|
*
|
|
* Socket Extensions for SCTP
|
|
* 5.3.1.6 SCTP_ADAPTATION_INDICATION
|
|
*/
|
|
struct sctp_ulpevent *sctp_ulpevent_make_adaptation_indication(
|
|
const struct sctp_association *asoc, gfp_t gfp)
|
|
{
|
|
struct sctp_ulpevent *event;
|
|
struct sctp_adaptation_event *sai;
|
|
struct sk_buff *skb;
|
|
|
|
event = sctp_ulpevent_new(sizeof(struct sctp_adaptation_event),
|
|
MSG_NOTIFICATION, gfp);
|
|
if (!event)
|
|
goto fail;
|
|
|
|
skb = sctp_event2skb(event);
|
|
sai = (struct sctp_adaptation_event *)
|
|
skb_put(skb, sizeof(struct sctp_adaptation_event));
|
|
|
|
sai->sai_type = SCTP_ADAPTATION_INDICATION;
|
|
sai->sai_flags = 0;
|
|
sai->sai_length = sizeof(struct sctp_adaptation_event);
|
|
sai->sai_adaptation_ind = asoc->peer.adaptation_ind;
|
|
sctp_ulpevent_set_owner(event, asoc);
|
|
sai->sai_assoc_id = sctp_assoc2id(asoc);
|
|
|
|
return event;
|
|
|
|
fail:
|
|
return NULL;
|
|
}
|
|
|
|
/* A message has been received. Package this message as a notification
|
|
* to pass it to the upper layers. Go ahead and calculate the sndrcvinfo
|
|
* even if filtered out later.
|
|
*
|
|
* Socket Extensions for SCTP
|
|
* 5.2.2 SCTP Header Information Structure (SCTP_SNDRCV)
|
|
*/
|
|
struct sctp_ulpevent *sctp_ulpevent_make_rcvmsg(struct sctp_association *asoc,
|
|
struct sctp_chunk *chunk,
|
|
gfp_t gfp)
|
|
{
|
|
struct sctp_ulpevent *event = NULL;
|
|
struct sk_buff *skb;
|
|
size_t padding, len;
|
|
|
|
/* Clone the original skb, sharing the data. */
|
|
skb = skb_clone(chunk->skb, gfp);
|
|
if (!skb)
|
|
goto fail;
|
|
|
|
/* First calculate the padding, so we don't inadvertently
|
|
* pass up the wrong length to the user.
|
|
*
|
|
* RFC 2960 - Section 3.2 Chunk Field Descriptions
|
|
*
|
|
* The total length of a chunk(including Type, Length and Value fields)
|
|
* MUST be a multiple of 4 bytes. If the length of the chunk is not a
|
|
* multiple of 4 bytes, the sender MUST pad the chunk with all zero
|
|
* bytes and this padding is not included in the chunk length field.
|
|
* The sender should never pad with more than 3 bytes. The receiver
|
|
* MUST ignore the padding bytes.
|
|
*/
|
|
len = ntohs(chunk->chunk_hdr->length);
|
|
padding = WORD_ROUND(len) - len;
|
|
|
|
/* Fixup cloned skb with just this chunks data. */
|
|
skb_trim(skb, chunk->chunk_end - padding - skb->data);
|
|
|
|
/* Embed the event fields inside the cloned skb. */
|
|
event = sctp_skb2event(skb);
|
|
|
|
/* Initialize event with flags 0 and correct length
|
|
* Since this is a clone of the original skb, only account for
|
|
* the data of this chunk as other chunks will be accounted separately.
|
|
*/
|
|
sctp_ulpevent_init(event, 0, skb->len + sizeof(struct sk_buff));
|
|
|
|
sctp_ulpevent_receive_data(event, asoc);
|
|
|
|
event->stream = ntohs(chunk->subh.data_hdr->stream);
|
|
event->ssn = ntohs(chunk->subh.data_hdr->ssn);
|
|
event->ppid = chunk->subh.data_hdr->ppid;
|
|
if (chunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) {
|
|
event->flags |= SCTP_UNORDERED;
|
|
event->cumtsn = sctp_tsnmap_get_ctsn(&asoc->peer.tsn_map);
|
|
}
|
|
event->tsn = ntohl(chunk->subh.data_hdr->tsn);
|
|
event->msg_flags |= chunk->chunk_hdr->flags;
|
|
event->iif = sctp_chunk_iif(chunk);
|
|
|
|
fail:
|
|
return event;
|
|
}
|
|
|
|
/* Create a partial delivery related event.
|
|
*
|
|
* 5.3.1.7 SCTP_PARTIAL_DELIVERY_EVENT
|
|
*
|
|
* When a receiver is engaged in a partial delivery of a
|
|
* message this notification will be used to indicate
|
|
* various events.
|
|
*/
|
|
struct sctp_ulpevent *sctp_ulpevent_make_pdapi(
|
|
const struct sctp_association *asoc, __u32 indication,
|
|
gfp_t gfp)
|
|
{
|
|
struct sctp_ulpevent *event;
|
|
struct sctp_pdapi_event *pd;
|
|
struct sk_buff *skb;
|
|
|
|
event = sctp_ulpevent_new(sizeof(struct sctp_pdapi_event),
|
|
MSG_NOTIFICATION, gfp);
|
|
if (!event)
|
|
goto fail;
|
|
|
|
skb = sctp_event2skb(event);
|
|
pd = (struct sctp_pdapi_event *)
|
|
skb_put(skb, sizeof(struct sctp_pdapi_event));
|
|
|
|
/* pdapi_type
|
|
* It should be SCTP_PARTIAL_DELIVERY_EVENT
|
|
*
|
|
* pdapi_flags: 16 bits (unsigned integer)
|
|
* Currently unused.
|
|
*/
|
|
pd->pdapi_type = SCTP_PARTIAL_DELIVERY_EVENT;
|
|
pd->pdapi_flags = 0;
|
|
|
|
/* pdapi_length: 32 bits (unsigned integer)
|
|
*
|
|
* This field is the total length of the notification data, including
|
|
* the notification header. It will generally be sizeof (struct
|
|
* sctp_pdapi_event).
|
|
*/
|
|
pd->pdapi_length = sizeof(struct sctp_pdapi_event);
|
|
|
|
/* pdapi_indication: 32 bits (unsigned integer)
|
|
*
|
|
* This field holds the indication being sent to the application.
|
|
*/
|
|
pd->pdapi_indication = indication;
|
|
|
|
/* pdapi_assoc_id: sizeof (sctp_assoc_t)
|
|
*
|
|
* The association id field, holds the identifier for the association.
|
|
*/
|
|
sctp_ulpevent_set_owner(event, asoc);
|
|
pd->pdapi_assoc_id = sctp_assoc2id(asoc);
|
|
|
|
return event;
|
|
fail:
|
|
return NULL;
|
|
}
|
|
|
|
/* Return the notification type, assuming this is a notification
|
|
* event.
|
|
*/
|
|
__u16 sctp_ulpevent_get_notification_type(const struct sctp_ulpevent *event)
|
|
{
|
|
union sctp_notification *notification;
|
|
struct sk_buff *skb;
|
|
|
|
skb = sctp_event2skb((struct sctp_ulpevent *)event);
|
|
notification = (union sctp_notification *) skb->data;
|
|
return notification->sn_header.sn_type;
|
|
}
|
|
|
|
/* Copy out the sndrcvinfo into a msghdr. */
|
|
void sctp_ulpevent_read_sndrcvinfo(const struct sctp_ulpevent *event,
|
|
struct msghdr *msghdr)
|
|
{
|
|
struct sctp_sndrcvinfo sinfo;
|
|
|
|
if (sctp_ulpevent_is_notification(event))
|
|
return;
|
|
|
|
/* Sockets API Extensions for SCTP
|
|
* Section 5.2.2 SCTP Header Information Structure (SCTP_SNDRCV)
|
|
*
|
|
* sinfo_stream: 16 bits (unsigned integer)
|
|
*
|
|
* For recvmsg() the SCTP stack places the message's stream number in
|
|
* this value.
|
|
*/
|
|
sinfo.sinfo_stream = event->stream;
|
|
/* sinfo_ssn: 16 bits (unsigned integer)
|
|
*
|
|
* For recvmsg() this value contains the stream sequence number that
|
|
* the remote endpoint placed in the DATA chunk. For fragmented
|
|
* messages this is the same number for all deliveries of the message
|
|
* (if more than one recvmsg() is needed to read the message).
|
|
*/
|
|
sinfo.sinfo_ssn = event->ssn;
|
|
/* sinfo_ppid: 32 bits (unsigned integer)
|
|
*
|
|
* In recvmsg() this value is
|
|
* the same information that was passed by the upper layer in the peer
|
|
* application. Please note that byte order issues are NOT accounted
|
|
* for and this information is passed opaquely by the SCTP stack from
|
|
* one end to the other.
|
|
*/
|
|
sinfo.sinfo_ppid = event->ppid;
|
|
/* sinfo_flags: 16 bits (unsigned integer)
|
|
*
|
|
* This field may contain any of the following flags and is composed of
|
|
* a bitwise OR of these values.
|
|
*
|
|
* recvmsg() flags:
|
|
*
|
|
* SCTP_UNORDERED - This flag is present when the message was sent
|
|
* non-ordered.
|
|
*/
|
|
sinfo.sinfo_flags = event->flags;
|
|
/* sinfo_tsn: 32 bit (unsigned integer)
|
|
*
|
|
* For the receiving side, this field holds a TSN that was
|
|
* assigned to one of the SCTP Data Chunks.
|
|
*/
|
|
sinfo.sinfo_tsn = event->tsn;
|
|
/* sinfo_cumtsn: 32 bit (unsigned integer)
|
|
*
|
|
* This field will hold the current cumulative TSN as
|
|
* known by the underlying SCTP layer. Note this field is
|
|
* ignored when sending and only valid for a receive
|
|
* operation when sinfo_flags are set to SCTP_UNORDERED.
|
|
*/
|
|
sinfo.sinfo_cumtsn = event->cumtsn;
|
|
/* sinfo_assoc_id: sizeof (sctp_assoc_t)
|
|
*
|
|
* The association handle field, sinfo_assoc_id, holds the identifier
|
|
* for the association announced in the COMMUNICATION_UP notification.
|
|
* All notifications for a given association have the same identifier.
|
|
* Ignored for one-to-one style sockets.
|
|
*/
|
|
sinfo.sinfo_assoc_id = sctp_assoc2id(event->asoc);
|
|
|
|
/* context value that is set via SCTP_CONTEXT socket option. */
|
|
sinfo.sinfo_context = event->asoc->default_rcv_context;
|
|
|
|
/* These fields are not used while receiving. */
|
|
sinfo.sinfo_timetolive = 0;
|
|
|
|
put_cmsg(msghdr, IPPROTO_SCTP, SCTP_SNDRCV,
|
|
sizeof(struct sctp_sndrcvinfo), (void *)&sinfo);
|
|
}
|
|
|
|
/* Do accounting for bytes received and hold a reference to the association
|
|
* for each skb.
|
|
*/
|
|
static void sctp_ulpevent_receive_data(struct sctp_ulpevent *event,
|
|
struct sctp_association *asoc)
|
|
{
|
|
struct sk_buff *skb, *frag;
|
|
|
|
skb = sctp_event2skb(event);
|
|
/* Set the owner and charge rwnd for bytes received. */
|
|
sctp_ulpevent_set_owner(event, asoc);
|
|
sctp_assoc_rwnd_decrease(asoc, skb_headlen(skb));
|
|
|
|
if (!skb->data_len)
|
|
return;
|
|
|
|
/* Note: Not clearing the entire event struct as this is just a
|
|
* fragment of the real event. However, we still need to do rwnd
|
|
* accounting.
|
|
* In general, the skb passed from IP can have only 1 level of
|
|
* fragments. But we allow multiple levels of fragments.
|
|
*/
|
|
for (frag = skb_shinfo(skb)->frag_list; frag; frag = frag->next) {
|
|
sctp_ulpevent_receive_data(sctp_skb2event(frag), asoc);
|
|
}
|
|
}
|
|
|
|
/* Do accounting for bytes just read by user and release the references to
|
|
* the association.
|
|
*/
|
|
static void sctp_ulpevent_release_data(struct sctp_ulpevent *event)
|
|
{
|
|
struct sk_buff *skb, *frag;
|
|
unsigned int len;
|
|
|
|
/* Current stack structures assume that the rcv buffer is
|
|
* per socket. For UDP style sockets this is not true as
|
|
* multiple associations may be on a single UDP-style socket.
|
|
* Use the local private area of the skb to track the owning
|
|
* association.
|
|
*/
|
|
|
|
skb = sctp_event2skb(event);
|
|
len = skb->len;
|
|
|
|
if (!skb->data_len)
|
|
goto done;
|
|
|
|
/* Don't forget the fragments. */
|
|
for (frag = skb_shinfo(skb)->frag_list; frag; frag = frag->next) {
|
|
/* NOTE: skb_shinfos are recursive. Although IP returns
|
|
* skb's with only 1 level of fragments, SCTP reassembly can
|
|
* increase the levels.
|
|
*/
|
|
sctp_ulpevent_release_frag_data(sctp_skb2event(frag));
|
|
}
|
|
|
|
done:
|
|
sctp_assoc_rwnd_increase(event->asoc, len);
|
|
sctp_ulpevent_release_owner(event);
|
|
}
|
|
|
|
static void sctp_ulpevent_release_frag_data(struct sctp_ulpevent *event)
|
|
{
|
|
struct sk_buff *skb, *frag;
|
|
|
|
skb = sctp_event2skb(event);
|
|
|
|
if (!skb->data_len)
|
|
goto done;
|
|
|
|
/* Don't forget the fragments. */
|
|
for (frag = skb_shinfo(skb)->frag_list; frag; frag = frag->next) {
|
|
/* NOTE: skb_shinfos are recursive. Although IP returns
|
|
* skb's with only 1 level of fragments, SCTP reassembly can
|
|
* increase the levels.
|
|
*/
|
|
sctp_ulpevent_release_frag_data(sctp_skb2event(frag));
|
|
}
|
|
|
|
done:
|
|
sctp_ulpevent_release_owner(event);
|
|
}
|
|
|
|
/* Free a ulpevent that has an owner. It includes releasing the reference
|
|
* to the owner, updating the rwnd in case of a DATA event and freeing the
|
|
* skb.
|
|
*/
|
|
void sctp_ulpevent_free(struct sctp_ulpevent *event)
|
|
{
|
|
if (sctp_ulpevent_is_notification(event))
|
|
sctp_ulpevent_release_owner(event);
|
|
else
|
|
sctp_ulpevent_release_data(event);
|
|
|
|
kfree_skb(sctp_event2skb(event));
|
|
}
|
|
|
|
/* Purge the skb lists holding ulpevents. */
|
|
void sctp_queue_purge_ulpevents(struct sk_buff_head *list)
|
|
{
|
|
struct sk_buff *skb;
|
|
while ((skb = skb_dequeue(list)) != NULL)
|
|
sctp_ulpevent_free(sctp_skb2event(skb));
|
|
}
|