| /* 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). |
| * |
| * 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. |
| * |
| * 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. |
| * See the GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with GNU CC; see the file COPYING. If not, see |
| * <http://www.gnu.org/licenses/>. |
| * |
| * 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 = (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)); |
| } |
| |
| /* 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. |
| */ |
| 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 = (struct sctp_paddr_change *) |
| 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; |
| } |
| |
| /* 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_ulpevent *event; |
| struct sctp_remote_error *sre; |
| struct sk_buff *skb; |
| sctp_errhdr_t *ch; |
| __be16 cause; |
| int elen; |
| |
| ch = (sctp_errhdr_t *)(chunk->skb->data); |
| cause = ch->cause; |
| elen = SCTP_PAD4(ntohs(ch->length)) - sizeof(sctp_errhdr_t); |
| |
| /* Pull off the ERROR header. */ |
| skb_pull(chunk->skb, sizeof(sctp_errhdr_t)); |
| |
| /* 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 = (struct sctp_remote_error *) 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, sizeof(struct sctp_data_chunk)); |
| len -= sizeof(struct sctp_data_chunk); |
| |
| /* Embed the event fields inside the cloned skb. */ |
| event = sctp_skb2event(skb); |
| sctp_ulpevent_init(event, MSG_NOTIFICATION, skb->truesize); |
| |
| ssf = (struct sctp_send_failed *) |
| 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; |
| } |
| |
| /* 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; |
| 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, |
| 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), |
| 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. |
| */ |
| len = ntohs(chunk->chunk_hdr->length); |
| padding = SCTP_PAD4(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)); |
| |
| /* 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); |
| 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; |
| |
| 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, |
| 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; |
| } |
| |
| 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_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 = (struct sctp_sender_dry_event *) |
| 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; |
| } |
| |
| /* 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; |
| } |