-/* SCTP kernel reference Implementation
+/* SCTP kernel implementation
* (C) Copyright IBM Corp. 2001, 2004
* Copyright (c) 1999-2000 Cisco, Inc.
* Copyright (c) 1999-2001 Motorola, Inc.
*
* These functions manipulate an sctp event. The struct ulpevent is used
* to carry notifications and data to the ULP (sockets).
- * The SCTP reference implementation is free software;
+ *
+ * This SCTP implementation is free software;
* you can redistribute it and/or modify it under the terms of
* the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
- * The SCTP reference implementation is distributed in the hope that it
+ * This SCTP implementation is distributed in the hope that it
* will be useful, but WITHOUT ANY WARRANTY; without even the implied
* ************************
* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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);
-/* Stub skb destructor. */
-static void sctp_stub_rfree(struct sk_buff *skb)
-{
-/* WARNING: This function is just a warning not to use the
- * skb destructor. If the skb is shared, we may get the destructor
- * callback on some processor that does not own the sock_lock. This
- * was occuring with PACKET socket applications that were monitoring
- * our skbs. We can't take the sock_lock, because we can't risk
- * recursing if we do really own the sock lock. Instead, do all
- * of our rwnd manipulation while we own the sock_lock outright.
- */
-}
/* Initialize an ULP event from an given skb. */
-SCTP_STATIC void sctp_ulpevent_init(struct sctp_ulpevent *event, int msg_flags)
+SCTP_STATIC void sctp_ulpevent_init(struct sctp_ulpevent *event,
+ int 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. */
SCTP_STATIC struct sctp_ulpevent *sctp_ulpevent_new(int size, int msg_flags,
- int gfp)
+ gfp_t gfp)
{
struct sctp_ulpevent *event;
struct sk_buff *skb;
goto fail;
event = sctp_skb2event(skb);
- sctp_ulpevent_init(event, msg_flags);
+ sctp_ulpevent_init(event, msg_flags, skb->truesize);
return event;
*/
sctp_association_hold((struct sctp_association *)asoc);
skb = sctp_event2skb(event);
- skb->sk = asoc->base.sk;
event->asoc = (struct sctp_association *)asoc;
- skb->destructor = sctp_stub_rfree;
+ atomic_add(event->rmem_len, &event->asoc->rmem_alloc);
+ sctp_skb_set_owner_r(skb, 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)
{
- sctp_association_put(event->asoc);
+ 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.
struct sctp_ulpevent *sctp_ulpevent_make_assoc_change(
const struct sctp_association *asoc,
__u16 flags, __u16 state, __u16 error, __u16 outbound,
- __u16 inbound, int gfp)
+ __u16 inbound, struct sctp_chunk *chunk, gfp_t gfp)
{
struct sctp_ulpevent *event;
struct sctp_assoc_change *sac;
struct sk_buff *skb;
- event = sctp_ulpevent_new(sizeof(struct sctp_assoc_change),
+ /* 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 = (struct sctp_assoc_change *)
+ 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(sctp_chunkhdr_t));
+ } else {
+ event = sctp_ulpevent_new(sizeof(struct sctp_assoc_change),
MSG_NOTIFICATION, gfp);
- if (!event)
- goto fail;
- skb = sctp_event2skb(event);
- sac = (struct sctp_assoc_change *)
- skb_put(skb, sizeof(struct sctp_assoc_change));
+ if (!event)
+ goto fail;
+
+ skb = sctp_event2skb(event);
+ sac = (struct sctp_assoc_change *) skb_put(skb,
+ sizeof(struct sctp_assoc_change));
+ }
/* Socket Extensions for SCTP
* 5.3.1.1 SCTP_ASSOC_CHANGE
* This field is the total length of the notification data, including
* the notification header.
*/
- sac->sac_length = sizeof(struct sctp_assoc_change);
+ sac->sac_length = skb->len;
/* Socket Extensions for SCTP
* 5.3.1.1 SCTP_ASSOC_CHANGE
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, int gfp)
+ int flags, int state, int error, gfp_t gfp)
{
struct sctp_ulpevent *event;
struct sctp_paddr_change *spc;
*/
struct sctp_ulpevent *sctp_ulpevent_make_remote_error(
const struct sctp_association *asoc, struct sctp_chunk *chunk,
- __u16 flags, int gfp)
+ __u16 flags, gfp_t gfp)
{
struct sctp_ulpevent *event;
struct sctp_remote_error *sre;
struct sk_buff *skb;
sctp_errhdr_t *ch;
- __u16 cause;
+ __be16 cause;
int elen;
ch = (sctp_errhdr_t *)(chunk->skb->data);
/* Embed the event fields inside the cloned skb. */
event = sctp_skb2event(skb);
- sctp_ulpevent_init(event, MSG_NOTIFICATION);
+ sctp_ulpevent_init(event, MSG_NOTIFICATION, skb->truesize);
sre = (struct sctp_remote_error *)
skb_push(skb, sizeof(struct sctp_remote_error));
*/
struct sctp_ulpevent *sctp_ulpevent_make_send_failed(
const struct sctp_association *asoc, struct sctp_chunk *chunk,
- __u16 flags, __u32 error, int gfp)
+ __u16 flags, __u32 error, gfp_t gfp)
{
struct sctp_ulpevent *event;
struct sctp_send_failed *ssf;
/* Embed the event fields inside the cloned skb. */
event = sctp_skb2event(skb);
- sctp_ulpevent_init(event, MSG_NOTIFICATION);
+ sctp_ulpevent_init(event, MSG_NOTIFICATION, skb->truesize);
ssf = (struct sctp_send_failed *)
skb_push(skb, sizeof(struct sctp_send_failed));
*/
struct sctp_ulpevent *sctp_ulpevent_make_shutdown_event(
const struct sctp_association *asoc,
- __u16 flags, int gfp)
+ __u16 flags, gfp_t gfp)
{
struct sctp_ulpevent *event;
struct sctp_shutdown_event *sse;
return NULL;
}
-/* Create and initialize a SCTP_ADAPTION_INDICATION notification.
+/* Create and initialize a SCTP_ADAPTATION_INDICATION notification.
*
* Socket Extensions for SCTP
- * 5.3.1.6 SCTP_ADAPTION_INDICATION
+ * 5.3.1.6 SCTP_ADAPTATION_INDICATION
*/
-struct sctp_ulpevent *sctp_ulpevent_make_adaption_indication(
- const struct sctp_association *asoc, int gfp)
+struct sctp_ulpevent *sctp_ulpevent_make_adaptation_indication(
+ const struct sctp_association *asoc, gfp_t gfp)
{
struct sctp_ulpevent *event;
- struct sctp_adaption_event *sai;
+ struct sctp_adaptation_event *sai;
struct sk_buff *skb;
- event = sctp_ulpevent_new(sizeof(struct sctp_adaption_event),
+ event = sctp_ulpevent_new(sizeof(struct sctp_adaptation_event),
MSG_NOTIFICATION, gfp);
if (!event)
goto fail;
skb = sctp_event2skb(event);
- sai = (struct sctp_adaption_event *)
- skb_put(skb, sizeof(struct sctp_adaption_event));
+ sai = (struct sctp_adaptation_event *)
+ skb_put(skb, sizeof(struct sctp_adaptation_event));
- sai->sai_type = SCTP_ADAPTION_INDICATION;
+ sai->sai_type = SCTP_ADAPTATION_INDICATION;
sai->sai_flags = 0;
- sai->sai_length = sizeof(struct sctp_adaption_event);
- sai->sai_adaption_ind = asoc->peer.adaption_ind;
+ 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);
*/
struct sctp_ulpevent *sctp_ulpevent_make_rcvmsg(struct sctp_association *asoc,
struct sctp_chunk *chunk,
- int gfp)
+ gfp_t gfp)
{
struct sctp_ulpevent *event = NULL;
struct sk_buff *skb;
size_t padding, len;
+ 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(&asoc->base.sk->sk_rmem_alloc);
+
+ if (rx_count >= asoc->base.sk->sk_rcvbuf) {
+
+ if ((asoc->base.sk->sk_userlocks & SOCK_RCVBUF_LOCK) ||
+ (!sk_rmem_schedule(asoc->base.sk, chunk->skb->truesize)))
+ 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)))
+ goto fail_mark;
+
/* First calculate the padding, so we don't inadvertently
* pass up the wrong length to the user.
*
/* Embed the event fields inside the cloned skb. */
event = sctp_skb2event(skb);
- /* Initialize event with flags 0. */
- sctp_ulpevent_init(event, 0);
+ /* 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->ssn = ntohs(chunk->subh.data_hdr->ssn);
event->ppid = chunk->subh.data_hdr->ppid;
if (chunk->chunk_hdr->flags & SCTP_DATA_UNORDERED) {
- event->flags |= MSG_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;
+
+fail_mark:
+ kfree_skb(skb);
+fail:
+ return NULL;
}
/* Create a partial delivery related event.
* various events.
*/
struct sctp_ulpevent *sctp_ulpevent_make_pdapi(
- const struct sctp_association *asoc, __u32 indication, int gfp)
+ const struct sctp_association *asoc, __u32 indication,
+ gfp_t gfp)
{
struct sctp_ulpevent *event;
struct sctp_pdapi_event *pd;
*/
pd->pdapi_length = sizeof(struct sctp_pdapi_event);
- /* pdapi_indication: 32 bits (unsigned integer)
+ /* pdapi_indication: 32 bits (unsigned integer)
*
* This field holds the indication being sent to the application.
*/
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 = (struct sctp_authkey_event *)
+ skb_put(skb, sizeof(struct sctp_authkey_event));
+
+ ak->auth_type = SCTP_AUTHENTICATION_INDICATION;
+ 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;
+}
+
+
/* Return the notification type, assuming this is a notification
* event.
*/
union sctp_notification *notification;
struct sk_buff *skb;
- skb = sctp_event2skb((struct sctp_ulpevent *)event);
+ skb = sctp_event2skb(event);
notification = (union sctp_notification *) skb->data;
return notification->sn_header.sn_type;
}
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.
- */
+ * 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)
*
*
* recvmsg() flags:
*
- * MSG_UNORDERED - This flag is present when the message was sent
+ * 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
+ * For the receiving side, this field holds a TSN that was
* assigned to one of the SCTP Data Chunks.
*/
sinfo.sinfo_tsn = event->tsn;
* 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 MSG_UNORDERED.
+ * operation when sinfo_flags are set to SCTP_UNORDERED.
*/
sinfo.sinfo_cumtsn = event->cumtsn;
/* sinfo_assoc_id: sizeof (sctp_assoc_t)
*/
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_context = 0;
sinfo.sinfo_timetolive = 0;
put_cmsg(msghdr, IPPROTO_SCTP, SCTP_SNDRCV,
* 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.
+ * fragments. But we allow multiple levels of fragments.
*/
- for (frag = skb_shinfo(skb)->frag_list; frag; frag = frag->next) {
+ 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
*/
skb = sctp_event2skb(event);
- sctp_assoc_rwnd_increase(event->asoc, skb_headlen(skb));
+ 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_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) {
+ 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_data(sctp_skb2event(frag));
+ sctp_ulpevent_release_frag_data(sctp_skb2event(frag));
}
done:
/* 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.
- * See comments in sctp_stub_rfree().
*/
void sctp_ulpevent_free(struct sctp_ulpevent *event)
{
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff