mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 09:19:51 +00:00
![Oliver Hartkopp](/assets/img/avatar_default.png)
The internal recvmsg() functions have two parameters 'flags' and 'noblock'
that were merged inside skb_recv_datagram(). As a follow up patch to commit
f4b41f062c
("net: remove noblock parameter from skb_recv_datagram()")
this patch removes the separate 'noblock' parameter for recvmsg().
Analogue to the referenced patch for skb_recv_datagram() the 'flags' and
'noblock' parameters are unnecessarily split up with e.g.
err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT,
flags & ~MSG_DONTWAIT, &addr_len);
or in
err = INDIRECT_CALL_2(sk->sk_prot->recvmsg, tcp_recvmsg, udp_recvmsg,
sk, msg, size, flags & MSG_DONTWAIT,
flags & ~MSG_DONTWAIT, &addr_len);
instead of simply using only flags all the time and check for MSG_DONTWAIT
where needed (to preserve for the formerly separated no(n)block condition).
Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
Link: https://lore.kernel.org/r/20220411124955.154876-1-socketcan@hartkopp.net
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
1190 lines
32 KiB
C
1190 lines
32 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/* SCTP kernel implementation
|
|
* (C) Copyright IBM Corp. 2001, 2004
|
|
* Copyright (c) 1999-2000 Cisco, Inc.
|
|
* Copyright (c) 1999-2001 Motorola, Inc.
|
|
* Copyright (c) 2001 Intel Corp.
|
|
* Copyright (c) 2001 Nokia, Inc.
|
|
* Copyright (c) 2001 La Monte H.P. Yarroll
|
|
*
|
|
* These functions manipulate an sctp event. The struct ulpevent is used
|
|
* to carry notifications and data to the ULP (sockets).
|
|
*
|
|
* Please send any bug reports or fixes you make to the
|
|
* email address(es):
|
|
* lksctp developers <linux-sctp@vger.kernel.org>
|
|
*
|
|
* Written or modified by:
|
|
* Jon Grimm <jgrimm@us.ibm.com>
|
|
* La Monte H.P. Yarroll <piggy@acm.org>
|
|
* Ardelle Fan <ardelle.fan@intel.com>
|
|
* Sridhar Samudrala <sri@us.ibm.com>
|
|
*/
|
|
|
|
#include <linux/slab.h>
|
|
#include <linux/types.h>
|
|
#include <linux/skbuff.h>
|
|
#include <net/sctp/structs.h>
|
|
#include <net/sctp/sctp.h>
|
|
#include <net/sctp/sm.h>
|
|
|
|
static void sctp_ulpevent_receive_data(struct sctp_ulpevent *event,
|
|
struct sctp_association *asoc);
|
|
static void sctp_ulpevent_release_data(struct sctp_ulpevent *event);
|
|
static void sctp_ulpevent_release_frag_data(struct sctp_ulpevent *event);
|
|
|
|
|
|
/* Initialize an ULP event from an given skb. */
|
|
static void sctp_ulpevent_init(struct sctp_ulpevent *event,
|
|
__u16 msg_flags,
|
|
unsigned int len)
|
|
{
|
|
memset(event, 0, sizeof(struct sctp_ulpevent));
|
|
event->msg_flags = msg_flags;
|
|
event->rmem_len = len;
|
|
}
|
|
|
|
/* Create a new sctp_ulpevent. */
|
|
static struct sctp_ulpevent *sctp_ulpevent_new(int size, __u16 msg_flags,
|
|
gfp_t gfp)
|
|
{
|
|
struct sctp_ulpevent *event;
|
|
struct sk_buff *skb;
|
|
|
|
skb = alloc_skb(size, gfp);
|
|
if (!skb)
|
|
goto fail;
|
|
|
|
event = sctp_skb2event(skb);
|
|
sctp_ulpevent_init(event, msg_flags, skb->truesize);
|
|
|
|
return event;
|
|
|
|
fail:
|
|
return NULL;
|
|
}
|
|
|
|
/* Is this a MSG_NOTIFICATION? */
|
|
int sctp_ulpevent_is_notification(const struct sctp_ulpevent *event)
|
|
{
|
|
return MSG_NOTIFICATION == (event->msg_flags & MSG_NOTIFICATION);
|
|
}
|
|
|
|
/* Hold the association in case the msg_name needs read out of
|
|
* the association.
|
|
*/
|
|
static inline void sctp_ulpevent_set_owner(struct sctp_ulpevent *event,
|
|
const struct sctp_association *asoc)
|
|
{
|
|
struct sctp_chunk *chunk = event->chunk;
|
|
struct sk_buff *skb;
|
|
|
|
/* Cast away the const, as we are just wanting to
|
|
* bump the reference count.
|
|
*/
|
|
sctp_association_hold((struct sctp_association *)asoc);
|
|
skb = sctp_event2skb(event);
|
|
event->asoc = (struct sctp_association *)asoc;
|
|
atomic_add(event->rmem_len, &event->asoc->rmem_alloc);
|
|
sctp_skb_set_owner_r(skb, asoc->base.sk);
|
|
if (chunk && chunk->head_skb && !chunk->head_skb->sk)
|
|
chunk->head_skb->sk = asoc->base.sk;
|
|
}
|
|
|
|
/* A simple destructor to give up the reference to the association. */
|
|
static inline void sctp_ulpevent_release_owner(struct sctp_ulpevent *event)
|
|
{
|
|
struct sctp_association *asoc = event->asoc;
|
|
|
|
atomic_sub(event->rmem_len, &asoc->rmem_alloc);
|
|
sctp_association_put(asoc);
|
|
}
|
|
|
|
/* Create and initialize an SCTP_ASSOC_CHANGE event.
|
|
*
|
|
* 5.3.1.1 SCTP_ASSOC_CHANGE
|
|
*
|
|
* Communication notifications inform the ULP that an SCTP association
|
|
* has either begun or ended. The identifier for a new association is
|
|
* provided by this notification.
|
|
*
|
|
* Note: There is no field checking here. If a field is unused it will be
|
|
* zero'd out.
|
|
*/
|
|
struct sctp_ulpevent *sctp_ulpevent_make_assoc_change(
|
|
const struct sctp_association *asoc,
|
|
__u16 flags, __u16 state, __u16 error, __u16 outbound,
|
|
__u16 inbound, struct sctp_chunk *chunk, gfp_t gfp)
|
|
{
|
|
struct sctp_ulpevent *event;
|
|
struct sctp_assoc_change *sac;
|
|
struct sk_buff *skb;
|
|
|
|
/* If the lower layer passed in the chunk, it will be
|
|
* an ABORT, so we need to include it in the sac_info.
|
|
*/
|
|
if (chunk) {
|
|
/* Copy the chunk data to a new skb and reserve enough
|
|
* head room to use as notification.
|
|
*/
|
|
skb = skb_copy_expand(chunk->skb,
|
|
sizeof(struct sctp_assoc_change), 0, gfp);
|
|
|
|
if (!skb)
|
|
goto fail;
|
|
|
|
/* Embed the event fields inside the cloned skb. */
|
|
event = sctp_skb2event(skb);
|
|
sctp_ulpevent_init(event, MSG_NOTIFICATION, skb->truesize);
|
|
|
|
/* Include the notification structure */
|
|
sac = skb_push(skb, sizeof(struct sctp_assoc_change));
|
|
|
|
/* Trim the buffer to the right length. */
|
|
skb_trim(skb, sizeof(struct sctp_assoc_change) +
|
|
ntohs(chunk->chunk_hdr->length) -
|
|
sizeof(struct sctp_chunkhdr));
|
|
} else {
|
|
event = sctp_ulpevent_new(sizeof(struct sctp_assoc_change),
|
|
MSG_NOTIFICATION, gfp);
|
|
if (!event)
|
|
goto fail;
|
|
|
|
skb = sctp_event2skb(event);
|
|
sac = skb_put(skb, sizeof(struct sctp_assoc_change));
|
|
}
|
|
|
|
/* Socket Extensions for SCTP
|
|
* 5.3.1.1 SCTP_ASSOC_CHANGE
|
|
*
|
|
* sac_type:
|
|
* It should be SCTP_ASSOC_CHANGE.
|
|
*/
|
|
sac->sac_type = SCTP_ASSOC_CHANGE;
|
|
|
|
/* Socket Extensions for SCTP
|
|
* 5.3.1.1 SCTP_ASSOC_CHANGE
|
|
*
|
|
* sac_state: 32 bits (signed integer)
|
|
* This field holds one of a number of values that communicate the
|
|
* event that happened to the association.
|
|
*/
|
|
sac->sac_state = state;
|
|
|
|
/* Socket Extensions for SCTP
|
|
* 5.3.1.1 SCTP_ASSOC_CHANGE
|
|
*
|
|
* sac_flags: 16 bits (unsigned integer)
|
|
* Currently unused.
|
|
*/
|
|
sac->sac_flags = 0;
|
|
|
|
/* Socket Extensions for SCTP
|
|
* 5.3.1.1 SCTP_ASSOC_CHANGE
|
|
*
|
|
* sac_length: sizeof (__u32)
|
|
* This field is the total length of the notification data, including
|
|
* the notification header.
|
|
*/
|
|
sac->sac_length = skb->len;
|
|
|
|
/* Socket Extensions for SCTP
|
|
* 5.3.1.1 SCTP_ASSOC_CHANGE
|
|
*
|
|
* sac_error: 32 bits (signed integer)
|
|
*
|
|
* If the state was reached due to a error condition (e.g.
|
|
* COMMUNICATION_LOST) any relevant error information is available in
|
|
* this field. This corresponds to the protocol error codes defined in
|
|
* [SCTP].
|
|
*/
|
|
sac->sac_error = error;
|
|
|
|
/* Socket Extensions for SCTP
|
|
* 5.3.1.1 SCTP_ASSOC_CHANGE
|
|
*
|
|
* sac_outbound_streams: 16 bits (unsigned integer)
|
|
* sac_inbound_streams: 16 bits (unsigned integer)
|
|
*
|
|
* The maximum number of streams allowed in each direction are
|
|
* available in sac_outbound_streams and sac_inbound streams.
|
|
*/
|
|
sac->sac_outbound_streams = outbound;
|
|
sac->sac_inbound_streams = inbound;
|
|
|
|
/* Socket Extensions for SCTP
|
|
* 5.3.1.1 SCTP_ASSOC_CHANGE
|
|
*
|
|
* sac_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);
|
|
sac->sac_assoc_id = sctp_assoc2id(asoc);
|
|
|
|
return event;
|
|
|
|
fail:
|
|
return NULL;
|
|
}
|
|
|
|
/* Create and initialize an SCTP_PEER_ADDR_CHANGE event.
|
|
*
|
|
* Socket Extensions for SCTP - draft-01
|
|
* 5.3.1.2 SCTP_PEER_ADDR_CHANGE
|
|
*
|
|
* When a destination address on a multi-homed peer encounters a change
|
|
* an interface details event is sent.
|
|
*/
|
|
static struct sctp_ulpevent *sctp_ulpevent_make_peer_addr_change(
|
|
const struct sctp_association *asoc,
|
|
const struct sockaddr_storage *aaddr,
|
|
int flags, int state, int error, gfp_t gfp)
|
|
{
|
|
struct sctp_ulpevent *event;
|
|
struct sctp_paddr_change *spc;
|
|
struct sk_buff *skb;
|
|
|
|
event = sctp_ulpevent_new(sizeof(struct sctp_paddr_change),
|
|
MSG_NOTIFICATION, gfp);
|
|
if (!event)
|
|
goto fail;
|
|
|
|
skb = sctp_event2skb(event);
|
|
spc = skb_put(skb, sizeof(struct sctp_paddr_change));
|
|
|
|
/* Sockets API Extensions for SCTP
|
|
* Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE
|
|
*
|
|
* spc_type:
|
|
*
|
|
* It should be SCTP_PEER_ADDR_CHANGE.
|
|
*/
|
|
spc->spc_type = SCTP_PEER_ADDR_CHANGE;
|
|
|
|
/* Sockets API Extensions for SCTP
|
|
* Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE
|
|
*
|
|
* spc_length: sizeof (__u32)
|
|
*
|
|
* This field is the total length of the notification data, including
|
|
* the notification header.
|
|
*/
|
|
spc->spc_length = sizeof(struct sctp_paddr_change);
|
|
|
|
/* Sockets API Extensions for SCTP
|
|
* Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE
|
|
*
|
|
* spc_flags: 16 bits (unsigned integer)
|
|
* Currently unused.
|
|
*/
|
|
spc->spc_flags = 0;
|
|
|
|
/* Sockets API Extensions for SCTP
|
|
* Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE
|
|
*
|
|
* spc_state: 32 bits (signed integer)
|
|
*
|
|
* This field holds one of a number of values that communicate the
|
|
* event that happened to the address.
|
|
*/
|
|
spc->spc_state = state;
|
|
|
|
/* Sockets API Extensions for SCTP
|
|
* Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE
|
|
*
|
|
* spc_error: 32 bits (signed integer)
|
|
*
|
|
* If the state was reached due to any error condition (e.g.
|
|
* ADDRESS_UNREACHABLE) any relevant error information is available in
|
|
* this field.
|
|
*/
|
|
spc->spc_error = error;
|
|
|
|
/* Socket Extensions for SCTP
|
|
* 5.3.1.1 SCTP_ASSOC_CHANGE
|
|
*
|
|
* spc_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);
|
|
spc->spc_assoc_id = sctp_assoc2id(asoc);
|
|
|
|
/* Sockets API Extensions for SCTP
|
|
* Section 5.3.1.2 SCTP_PEER_ADDR_CHANGE
|
|
*
|
|
* spc_aaddr: sizeof (struct sockaddr_storage)
|
|
*
|
|
* The affected address field, holds the remote peer's address that is
|
|
* encountering the change of state.
|
|
*/
|
|
memcpy(&spc->spc_aaddr, aaddr, sizeof(struct sockaddr_storage));
|
|
|
|
/* Map ipv4 address into v4-mapped-on-v6 address. */
|
|
sctp_get_pf_specific(asoc->base.sk->sk_family)->addr_to_user(
|
|
sctp_sk(asoc->base.sk),
|
|
(union sctp_addr *)&spc->spc_aaddr);
|
|
|
|
return event;
|
|
|
|
fail:
|
|
return NULL;
|
|
}
|
|
|
|
void sctp_ulpevent_notify_peer_addr_change(struct sctp_transport *transport,
|
|
int state, int error)
|
|
{
|
|
struct sctp_association *asoc = transport->asoc;
|
|
struct sockaddr_storage addr;
|
|
struct sctp_ulpevent *event;
|
|
|
|
if (asoc->state < SCTP_STATE_ESTABLISHED)
|
|
return;
|
|
|
|
memset(&addr, 0, sizeof(struct sockaddr_storage));
|
|
memcpy(&addr, &transport->ipaddr, transport->af_specific->sockaddr_len);
|
|
|
|
event = sctp_ulpevent_make_peer_addr_change(asoc, &addr, 0, state,
|
|
error, GFP_ATOMIC);
|
|
if (event)
|
|
asoc->stream.si->enqueue_event(&asoc->ulpq, event);
|
|
}
|
|
|
|
/* Create and initialize an SCTP_REMOTE_ERROR notification.
|
|
*
|
|
* Note: This assumes that the chunk->skb->data already points to the
|
|
* operation error payload.
|
|
*
|
|
* Socket Extensions for SCTP - draft-01
|
|
* 5.3.1.3 SCTP_REMOTE_ERROR
|
|
*
|
|
* A remote peer may send an Operational Error message to its peer.
|
|
* This message indicates a variety of error conditions on an
|
|
* association. The entire error TLV as it appears on the wire is
|
|
* included in a SCTP_REMOTE_ERROR event. Please refer to the SCTP
|
|
* specification [SCTP] and any extensions for a list of possible
|
|
* error formats.
|
|
*/
|
|
struct sctp_ulpevent *
|
|
sctp_ulpevent_make_remote_error(const struct sctp_association *asoc,
|
|
struct sctp_chunk *chunk, __u16 flags,
|
|
gfp_t gfp)
|
|
{
|
|
struct sctp_remote_error *sre;
|
|
struct sctp_ulpevent *event;
|
|
struct sctp_errhdr *ch;
|
|
struct sk_buff *skb;
|
|
__be16 cause;
|
|
int elen;
|
|
|
|
ch = (struct sctp_errhdr *)(chunk->skb->data);
|
|
cause = ch->cause;
|
|
elen = SCTP_PAD4(ntohs(ch->length)) - sizeof(*ch);
|
|
|
|
/* Pull off the ERROR header. */
|
|
skb_pull(chunk->skb, sizeof(*ch));
|
|
|
|
/* Copy the skb to a new skb with room for us to prepend
|
|
* notification with.
|
|
*/
|
|
skb = skb_copy_expand(chunk->skb, sizeof(*sre), 0, gfp);
|
|
|
|
/* Pull off the rest of the cause TLV from the chunk. */
|
|
skb_pull(chunk->skb, elen);
|
|
if (!skb)
|
|
goto fail;
|
|
|
|
/* Embed the event fields inside the cloned skb. */
|
|
event = sctp_skb2event(skb);
|
|
sctp_ulpevent_init(event, MSG_NOTIFICATION, skb->truesize);
|
|
|
|
sre = skb_push(skb, sizeof(*sre));
|
|
|
|
/* Trim the buffer to the right length. */
|
|
skb_trim(skb, sizeof(*sre) + elen);
|
|
|
|
/* RFC6458, Section 6.1.3. SCTP_REMOTE_ERROR */
|
|
memset(sre, 0, sizeof(*sre));
|
|
sre->sre_type = SCTP_REMOTE_ERROR;
|
|
sre->sre_flags = 0;
|
|
sre->sre_length = skb->len;
|
|
sre->sre_error = cause;
|
|
sctp_ulpevent_set_owner(event, asoc);
|
|
sre->sre_assoc_id = sctp_assoc2id(asoc);
|
|
|
|
return event;
|
|
fail:
|
|
return NULL;
|
|
}
|
|
|
|
/* Create and initialize a SCTP_SEND_FAILED notification.
|
|
*
|
|
* Socket Extensions for SCTP - draft-01
|
|
* 5.3.1.4 SCTP_SEND_FAILED
|
|
*/
|
|
struct sctp_ulpevent *sctp_ulpevent_make_send_failed(
|
|
const struct sctp_association *asoc, struct sctp_chunk *chunk,
|
|
__u16 flags, __u32 error, gfp_t gfp)
|
|
{
|
|
struct sctp_ulpevent *event;
|
|
struct sctp_send_failed *ssf;
|
|
struct sk_buff *skb;
|
|
|
|
/* Pull off any padding. */
|
|
int len = ntohs(chunk->chunk_hdr->length);
|
|
|
|
/* Make skb with more room so we can prepend notification. */
|
|
skb = skb_copy_expand(chunk->skb,
|
|
sizeof(struct sctp_send_failed), /* headroom */
|
|
0, /* tailroom */
|
|
gfp);
|
|
if (!skb)
|
|
goto fail;
|
|
|
|
/* Pull off the common chunk header and DATA header. */
|
|
skb_pull(skb, sctp_datachk_len(&asoc->stream));
|
|
len -= sctp_datachk_len(&asoc->stream);
|
|
|
|
/* Embed the event fields inside the cloned skb. */
|
|
event = sctp_skb2event(skb);
|
|
sctp_ulpevent_init(event, MSG_NOTIFICATION, skb->truesize);
|
|
|
|
ssf = skb_push(skb, sizeof(struct sctp_send_failed));
|
|
|
|
/* Socket Extensions for SCTP
|
|
* 5.3.1.4 SCTP_SEND_FAILED
|
|
*
|
|
* ssf_type:
|
|
* It should be SCTP_SEND_FAILED.
|
|
*/
|
|
ssf->ssf_type = SCTP_SEND_FAILED;
|
|
|
|
/* 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
|
|
* reassemble 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;
|
|
}
|
|
|
|
struct sctp_ulpevent *sctp_ulpevent_make_send_failed_event(
|
|
const struct sctp_association *asoc, struct sctp_chunk *chunk,
|
|
__u16 flags, __u32 error, gfp_t gfp)
|
|
{
|
|
struct sctp_send_failed_event *ssf;
|
|
struct sctp_ulpevent *event;
|
|
struct sk_buff *skb;
|
|
int len;
|
|
|
|
skb = skb_copy_expand(chunk->skb, sizeof(*ssf), 0, gfp);
|
|
if (!skb)
|
|
return NULL;
|
|
|
|
len = ntohs(chunk->chunk_hdr->length);
|
|
len -= sctp_datachk_len(&asoc->stream);
|
|
|
|
skb_pull(skb, sctp_datachk_len(&asoc->stream));
|
|
event = sctp_skb2event(skb);
|
|
sctp_ulpevent_init(event, MSG_NOTIFICATION, skb->truesize);
|
|
|
|
ssf = skb_push(skb, sizeof(*ssf));
|
|
ssf->ssf_type = SCTP_SEND_FAILED_EVENT;
|
|
ssf->ssf_flags = flags;
|
|
ssf->ssf_length = sizeof(*ssf) + len;
|
|
skb_trim(skb, ssf->ssf_length);
|
|
ssf->ssf_error = error;
|
|
|
|
ssf->ssfe_info.snd_sid = chunk->sinfo.sinfo_stream;
|
|
ssf->ssfe_info.snd_ppid = chunk->sinfo.sinfo_ppid;
|
|
ssf->ssfe_info.snd_context = chunk->sinfo.sinfo_context;
|
|
ssf->ssfe_info.snd_assoc_id = chunk->sinfo.sinfo_assoc_id;
|
|
ssf->ssfe_info.snd_flags = chunk->chunk_hdr->flags;
|
|
|
|
sctp_ulpevent_set_owner(event, asoc);
|
|
ssf->ssf_assoc_id = sctp_assoc2id(asoc);
|
|
|
|
return event;
|
|
}
|
|
|
|
/* 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 = 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 = 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 = chunk->skb;
|
|
struct sock *sk = asoc->base.sk;
|
|
size_t padding, datalen;
|
|
int rx_count;
|
|
|
|
/*
|
|
* check to see if we need to make space for this
|
|
* new skb, expand the rcvbuffer if needed, or drop
|
|
* the frame
|
|
*/
|
|
if (asoc->ep->rcvbuf_policy)
|
|
rx_count = atomic_read(&asoc->rmem_alloc);
|
|
else
|
|
rx_count = atomic_read(&sk->sk_rmem_alloc);
|
|
|
|
datalen = ntohs(chunk->chunk_hdr->length);
|
|
|
|
if (rx_count >= sk->sk_rcvbuf || !sk_rmem_schedule(sk, skb, datalen))
|
|
goto fail;
|
|
|
|
/* Clone the original skb, sharing the data. */
|
|
skb = skb_clone(chunk->skb, gfp);
|
|
if (!skb)
|
|
goto fail;
|
|
|
|
/* Now that all memory allocations for this chunk succeeded, we
|
|
* can mark it as received so the tsn_map is updated correctly.
|
|
*/
|
|
if (sctp_tsnmap_mark(&asoc->peer.tsn_map,
|
|
ntohl(chunk->subh.data_hdr->tsn),
|
|
chunk->transport))
|
|
goto fail_mark;
|
|
|
|
/* 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.
|
|
*/
|
|
padding = SCTP_PAD4(datalen) - datalen;
|
|
|
|
/* 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));
|
|
|
|
/* And hold the chunk as we need it for getting the IP headers
|
|
* later in recvmsg
|
|
*/
|
|
sctp_chunk_hold(chunk);
|
|
event->chunk = chunk;
|
|
|
|
sctp_ulpevent_receive_data(event, asoc);
|
|
|
|
event->stream = ntohs(chunk->subh.data_hdr->stream);
|
|
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;
|
|
|
|
return event;
|
|
|
|
fail_mark:
|
|
kfree_skb(skb);
|
|
fail:
|
|
return NULL;
|
|
}
|
|
|
|
/* 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, __u32 sid, __u32 seq,
|
|
__u32 flags, 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 = 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 = flags;
|
|
pd->pdapi_stream = sid;
|
|
pd->pdapi_seq = seq;
|
|
|
|
/* 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;
|
|
}
|
|
|
|
struct sctp_ulpevent *sctp_ulpevent_make_authkey(
|
|
const struct sctp_association *asoc, __u16 key_id,
|
|
__u32 indication, gfp_t gfp)
|
|
{
|
|
struct sctp_ulpevent *event;
|
|
struct sctp_authkey_event *ak;
|
|
struct sk_buff *skb;
|
|
|
|
event = sctp_ulpevent_new(sizeof(struct sctp_authkey_event),
|
|
MSG_NOTIFICATION, gfp);
|
|
if (!event)
|
|
goto fail;
|
|
|
|
skb = sctp_event2skb(event);
|
|
ak = skb_put(skb, sizeof(struct sctp_authkey_event));
|
|
|
|
ak->auth_type = SCTP_AUTHENTICATION_EVENT;
|
|
ak->auth_flags = 0;
|
|
ak->auth_length = sizeof(struct sctp_authkey_event);
|
|
|
|
ak->auth_keynumber = key_id;
|
|
ak->auth_altkeynumber = 0;
|
|
ak->auth_indication = indication;
|
|
|
|
/*
|
|
* The association id field, holds the identifier for the association.
|
|
*/
|
|
sctp_ulpevent_set_owner(event, asoc);
|
|
ak->auth_assoc_id = sctp_assoc2id(asoc);
|
|
|
|
return event;
|
|
fail:
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Socket Extensions for SCTP
|
|
* 6.3.10. SCTP_SENDER_DRY_EVENT
|
|
*/
|
|
struct sctp_ulpevent *sctp_ulpevent_make_sender_dry_event(
|
|
const struct sctp_association *asoc, gfp_t gfp)
|
|
{
|
|
struct sctp_ulpevent *event;
|
|
struct sctp_sender_dry_event *sdry;
|
|
struct sk_buff *skb;
|
|
|
|
event = sctp_ulpevent_new(sizeof(struct sctp_sender_dry_event),
|
|
MSG_NOTIFICATION, gfp);
|
|
if (!event)
|
|
return NULL;
|
|
|
|
skb = sctp_event2skb(event);
|
|
sdry = skb_put(skb, sizeof(struct sctp_sender_dry_event));
|
|
|
|
sdry->sender_dry_type = SCTP_SENDER_DRY_EVENT;
|
|
sdry->sender_dry_flags = 0;
|
|
sdry->sender_dry_length = sizeof(struct sctp_sender_dry_event);
|
|
sctp_ulpevent_set_owner(event, asoc);
|
|
sdry->sender_dry_assoc_id = sctp_assoc2id(asoc);
|
|
|
|
return event;
|
|
}
|
|
|
|
struct sctp_ulpevent *sctp_ulpevent_make_stream_reset_event(
|
|
const struct sctp_association *asoc, __u16 flags, __u16 stream_num,
|
|
__be16 *stream_list, gfp_t gfp)
|
|
{
|
|
struct sctp_stream_reset_event *sreset;
|
|
struct sctp_ulpevent *event;
|
|
struct sk_buff *skb;
|
|
int length, i;
|
|
|
|
length = sizeof(struct sctp_stream_reset_event) + 2 * stream_num;
|
|
event = sctp_ulpevent_new(length, MSG_NOTIFICATION, gfp);
|
|
if (!event)
|
|
return NULL;
|
|
|
|
skb = sctp_event2skb(event);
|
|
sreset = skb_put(skb, length);
|
|
|
|
sreset->strreset_type = SCTP_STREAM_RESET_EVENT;
|
|
sreset->strreset_flags = flags;
|
|
sreset->strreset_length = length;
|
|
sctp_ulpevent_set_owner(event, asoc);
|
|
sreset->strreset_assoc_id = sctp_assoc2id(asoc);
|
|
|
|
for (i = 0; i < stream_num; i++)
|
|
sreset->strreset_stream_list[i] = ntohs(stream_list[i]);
|
|
|
|
return event;
|
|
}
|
|
|
|
struct sctp_ulpevent *sctp_ulpevent_make_assoc_reset_event(
|
|
const struct sctp_association *asoc, __u16 flags, __u32 local_tsn,
|
|
__u32 remote_tsn, gfp_t gfp)
|
|
{
|
|
struct sctp_assoc_reset_event *areset;
|
|
struct sctp_ulpevent *event;
|
|
struct sk_buff *skb;
|
|
|
|
event = sctp_ulpevent_new(sizeof(struct sctp_assoc_reset_event),
|
|
MSG_NOTIFICATION, gfp);
|
|
if (!event)
|
|
return NULL;
|
|
|
|
skb = sctp_event2skb(event);
|
|
areset = skb_put(skb, sizeof(struct sctp_assoc_reset_event));
|
|
|
|
areset->assocreset_type = SCTP_ASSOC_RESET_EVENT;
|
|
areset->assocreset_flags = flags;
|
|
areset->assocreset_length = sizeof(struct sctp_assoc_reset_event);
|
|
sctp_ulpevent_set_owner(event, asoc);
|
|
areset->assocreset_assoc_id = sctp_assoc2id(asoc);
|
|
areset->assocreset_local_tsn = local_tsn;
|
|
areset->assocreset_remote_tsn = remote_tsn;
|
|
|
|
return event;
|
|
}
|
|
|
|
struct sctp_ulpevent *sctp_ulpevent_make_stream_change_event(
|
|
const struct sctp_association *asoc, __u16 flags,
|
|
__u32 strchange_instrms, __u32 strchange_outstrms, gfp_t gfp)
|
|
{
|
|
struct sctp_stream_change_event *schange;
|
|
struct sctp_ulpevent *event;
|
|
struct sk_buff *skb;
|
|
|
|
event = sctp_ulpevent_new(sizeof(struct sctp_stream_change_event),
|
|
MSG_NOTIFICATION, gfp);
|
|
if (!event)
|
|
return NULL;
|
|
|
|
skb = sctp_event2skb(event);
|
|
schange = skb_put(skb, sizeof(struct sctp_stream_change_event));
|
|
|
|
schange->strchange_type = SCTP_STREAM_CHANGE_EVENT;
|
|
schange->strchange_flags = flags;
|
|
schange->strchange_length = sizeof(struct sctp_stream_change_event);
|
|
sctp_ulpevent_set_owner(event, asoc);
|
|
schange->strchange_assoc_id = sctp_assoc2id(asoc);
|
|
schange->strchange_instrms = strchange_instrms;
|
|
schange->strchange_outstrms = strchange_outstrms;
|
|
|
|
return event;
|
|
}
|
|
|
|
/* 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(event);
|
|
notification = (union sctp_notification *) skb->data;
|
|
return notification->sn_header.sn_type;
|
|
}
|
|
|
|
/* RFC6458, Section 5.3.2. SCTP Header Information Structure
|
|
* (SCTP_SNDRCV, DEPRECATED)
|
|
*/
|
|
void sctp_ulpevent_read_sndrcvinfo(const struct sctp_ulpevent *event,
|
|
struct msghdr *msghdr)
|
|
{
|
|
struct sctp_sndrcvinfo sinfo;
|
|
|
|
if (sctp_ulpevent_is_notification(event))
|
|
return;
|
|
|
|
memset(&sinfo, 0, sizeof(sinfo));
|
|
sinfo.sinfo_stream = event->stream;
|
|
sinfo.sinfo_ssn = event->ssn;
|
|
sinfo.sinfo_ppid = event->ppid;
|
|
sinfo.sinfo_flags = event->flags;
|
|
sinfo.sinfo_tsn = event->tsn;
|
|
sinfo.sinfo_cumtsn = event->cumtsn;
|
|
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(sinfo), &sinfo);
|
|
}
|
|
|
|
/* RFC6458, Section 5.3.5 SCTP Receive Information Structure
|
|
* (SCTP_SNDRCV)
|
|
*/
|
|
void sctp_ulpevent_read_rcvinfo(const struct sctp_ulpevent *event,
|
|
struct msghdr *msghdr)
|
|
{
|
|
struct sctp_rcvinfo rinfo;
|
|
|
|
if (sctp_ulpevent_is_notification(event))
|
|
return;
|
|
|
|
memset(&rinfo, 0, sizeof(struct sctp_rcvinfo));
|
|
rinfo.rcv_sid = event->stream;
|
|
rinfo.rcv_ssn = event->ssn;
|
|
rinfo.rcv_ppid = event->ppid;
|
|
rinfo.rcv_flags = event->flags;
|
|
rinfo.rcv_tsn = event->tsn;
|
|
rinfo.rcv_cumtsn = event->cumtsn;
|
|
rinfo.rcv_assoc_id = sctp_assoc2id(event->asoc);
|
|
rinfo.rcv_context = event->asoc->default_rcv_context;
|
|
|
|
put_cmsg(msghdr, IPPROTO_SCTP, SCTP_RCVINFO,
|
|
sizeof(rinfo), &rinfo);
|
|
}
|
|
|
|
/* RFC6458, Section 5.3.6. SCTP Next Receive Information Structure
|
|
* (SCTP_NXTINFO)
|
|
*/
|
|
static void __sctp_ulpevent_read_nxtinfo(const struct sctp_ulpevent *event,
|
|
struct msghdr *msghdr,
|
|
const struct sk_buff *skb)
|
|
{
|
|
struct sctp_nxtinfo nxtinfo;
|
|
|
|
memset(&nxtinfo, 0, sizeof(nxtinfo));
|
|
nxtinfo.nxt_sid = event->stream;
|
|
nxtinfo.nxt_ppid = event->ppid;
|
|
nxtinfo.nxt_flags = event->flags;
|
|
if (sctp_ulpevent_is_notification(event))
|
|
nxtinfo.nxt_flags |= SCTP_NOTIFICATION;
|
|
nxtinfo.nxt_length = skb->len;
|
|
nxtinfo.nxt_assoc_id = sctp_assoc2id(event->asoc);
|
|
|
|
put_cmsg(msghdr, IPPROTO_SCTP, SCTP_NXTINFO,
|
|
sizeof(nxtinfo), &nxtinfo);
|
|
}
|
|
|
|
void sctp_ulpevent_read_nxtinfo(const struct sctp_ulpevent *event,
|
|
struct msghdr *msghdr,
|
|
struct sock *sk)
|
|
{
|
|
struct sk_buff *skb;
|
|
int err;
|
|
|
|
skb = sctp_skb_recv_datagram(sk, MSG_PEEK | MSG_DONTWAIT, &err);
|
|
if (skb != NULL) {
|
|
__sctp_ulpevent_read_nxtinfo(sctp_skb2event(skb),
|
|
msghdr, skb);
|
|
/* Just release refcount here. */
|
|
kfree_skb(skb);
|
|
}
|
|
}
|
|
|
|
/* 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.
|
|
*/
|
|
skb_walk_frags(skb, frag)
|
|
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. */
|
|
skb_walk_frags(skb, frag) {
|
|
/* 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_chunk_put(event->chunk);
|
|
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. */
|
|
skb_walk_frags(skb, frag) {
|
|
/* 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_chunk_put(event->chunk);
|
|
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. */
|
|
unsigned int sctp_queue_purge_ulpevents(struct sk_buff_head *list)
|
|
{
|
|
struct sk_buff *skb;
|
|
unsigned int data_unread = 0;
|
|
|
|
while ((skb = skb_dequeue(list)) != NULL) {
|
|
struct sctp_ulpevent *event = sctp_skb2event(skb);
|
|
|
|
if (!sctp_ulpevent_is_notification(event))
|
|
data_unread += skb->len;
|
|
|
|
sctp_ulpevent_free(event);
|
|
}
|
|
|
|
return data_unread;
|
|
}
|