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2347c80ff1
This patch implements section 5.3.6. of RFC6458, that is, support
for 'SCTP Next Receive Information Structure' (SCTP_NXTINFO) which
is placed into ancillary data cmsghdr structure for each recvmsg()
call, if this information is already available when delivering the
current message.
This option can be enabled/disabled via setsockopt(2) on SOL_SCTP
level by setting an int value with 1/0 for SCTP_RECVNXTINFO in
user space applications as per RFC6458, section 8.1.30.
The sctp_nxtinfo structure is defined as per RFC as below ...
struct sctp_nxtinfo {
uint16_t nxt_sid;
uint16_t nxt_flags;
uint32_t nxt_ppid;
uint32_t nxt_length;
sctp_assoc_t nxt_assoc_id;
};
... and provided under cmsg_level IPPROTO_SCTP, cmsg_type
SCTP_NXTINFO, while cmsg_data[] contains struct sctp_nxtinfo.
Joint work with Daniel Borkmann.
Signed-off-by: Geir Ola Vaagland <geirola@gmail.com>
Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
163 lines
4.9 KiB
C
163 lines
4.9 KiB
C
/* SCTP kernel implementation
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* (C) Copyright IBM Corp. 2001, 2004
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* Copyright (c) 1999-2000 Cisco, Inc.
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* Copyright (c) 1999-2001 Motorola, Inc.
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* Copyright (c) 2001 Intel Corp.
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* Copyright (c) 2001 Nokia, Inc.
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* Copyright (c) 2001 La Monte H.P. Yarroll
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*
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* These are the definitions needed for the sctp_ulpevent type. The
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* sctp_ulpevent type is used to carry information from the state machine
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* upwards to the ULP.
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*
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* This file is part of the SCTP kernel implementation
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*
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* This SCTP implementation is free software;
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* you can redistribute it and/or modify it under the terms of
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* the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This SCTP implementation is distributed in the hope that it
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* will be useful, but WITHOUT ANY WARRANTY; without even the implied
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* ************************
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* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNU CC; see the file COPYING. If not, see
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* <http://www.gnu.org/licenses/>.
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*
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* Please send any bug reports or fixes you make to the
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* email address(es):
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* lksctp developers <linux-sctp@vger.kernel.org>
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*
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* Written or modified by:
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* Jon Grimm <jgrimm@us.ibm.com>
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* La Monte H.P. Yarroll <piggy@acm.org>
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* Karl Knutson <karl@athena.chicago.il.us>
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* Sridhar Samudrala <sri@us.ibm.com>
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*/
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#ifndef __sctp_ulpevent_h__
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#define __sctp_ulpevent_h__
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/* A structure to carry information to the ULP (e.g. Sockets API) */
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/* Warning: This sits inside an skb.cb[] area. Be very careful of
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* growing this structure as it is at the maximum limit now.
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*/
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struct sctp_ulpevent {
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struct sctp_association *asoc;
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__u16 stream;
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__u16 ssn;
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__u16 flags;
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__u32 ppid;
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__u32 tsn;
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__u32 cumtsn;
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int msg_flags;
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int iif;
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unsigned int rmem_len;
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};
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/* Retrieve the skb this event sits inside of. */
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static inline struct sk_buff *sctp_event2skb(const struct sctp_ulpevent *ev)
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{
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return container_of((void *)ev, struct sk_buff, cb);
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}
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/* Retrieve & cast the event sitting inside the skb. */
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static inline struct sctp_ulpevent *sctp_skb2event(struct sk_buff *skb)
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{
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return (struct sctp_ulpevent *)skb->cb;
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}
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void sctp_ulpevent_free(struct sctp_ulpevent *);
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int sctp_ulpevent_is_notification(const struct sctp_ulpevent *);
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unsigned int sctp_queue_purge_ulpevents(struct sk_buff_head *list);
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struct sctp_ulpevent *sctp_ulpevent_make_assoc_change(
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const struct sctp_association *asoc,
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__u16 flags,
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__u16 state,
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__u16 error,
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__u16 outbound,
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__u16 inbound,
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struct sctp_chunk *chunk,
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gfp_t gfp);
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struct sctp_ulpevent *sctp_ulpevent_make_peer_addr_change(
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const struct sctp_association *asoc,
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const struct sockaddr_storage *aaddr,
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int flags,
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int state,
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int error,
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gfp_t gfp);
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struct sctp_ulpevent *sctp_ulpevent_make_remote_error(
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const struct sctp_association *asoc,
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struct sctp_chunk *chunk,
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__u16 flags,
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gfp_t gfp);
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struct sctp_ulpevent *sctp_ulpevent_make_send_failed(
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const struct sctp_association *asoc,
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struct sctp_chunk *chunk,
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__u16 flags,
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__u32 error,
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gfp_t gfp);
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struct sctp_ulpevent *sctp_ulpevent_make_shutdown_event(
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const struct sctp_association *asoc,
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__u16 flags,
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gfp_t gfp);
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struct sctp_ulpevent *sctp_ulpevent_make_pdapi(
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const struct sctp_association *asoc,
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__u32 indication, gfp_t gfp);
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struct sctp_ulpevent *sctp_ulpevent_make_adaptation_indication(
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const struct sctp_association *asoc, gfp_t gfp);
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struct sctp_ulpevent *sctp_ulpevent_make_rcvmsg(struct sctp_association *asoc,
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struct sctp_chunk *chunk,
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gfp_t gfp);
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struct sctp_ulpevent *sctp_ulpevent_make_authkey(
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const struct sctp_association *asoc, __u16 key_id,
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__u32 indication, gfp_t gfp);
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struct sctp_ulpevent *sctp_ulpevent_make_sender_dry_event(
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const struct sctp_association *asoc, gfp_t gfp);
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void sctp_ulpevent_read_sndrcvinfo(const struct sctp_ulpevent *event,
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struct msghdr *);
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void sctp_ulpevent_read_rcvinfo(const struct sctp_ulpevent *event,
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struct msghdr *);
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void sctp_ulpevent_read_nxtinfo(const struct sctp_ulpevent *event,
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struct msghdr *, struct sock *sk);
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__u16 sctp_ulpevent_get_notification_type(const struct sctp_ulpevent *event);
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/* Is this event type enabled? */
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static inline int sctp_ulpevent_type_enabled(__u16 sn_type,
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struct sctp_event_subscribe *mask)
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{
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char *amask = (char *) mask;
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return amask[sn_type - SCTP_SN_TYPE_BASE];
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}
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/* Given an event subscription, is this event enabled? */
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static inline int sctp_ulpevent_is_enabled(const struct sctp_ulpevent *event,
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struct sctp_event_subscribe *mask)
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{
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__u16 sn_type;
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int enabled = 1;
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if (sctp_ulpevent_is_notification(event)) {
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sn_type = sctp_ulpevent_get_notification_type(event);
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enabled = sctp_ulpevent_type_enabled(sn_type, mask);
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}
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return enabled;
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}
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#endif /* __sctp_ulpevent_h__ */
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