forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
1190 lines
32 KiB
1190 lines
32 KiB
// 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 <[email protected]> |
|
* |
|
* Written or modified by: |
|
* Jon Grimm <[email protected]> |
|
* La Monte H.P. Yarroll <[email protected]> |
|
* Ardelle Fan <[email protected]> |
|
* Sridhar Samudrala <[email protected]> |
|
*/ |
|
|
|
#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, 1, &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; |
|
}
|
|
|