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net: sctp: implement rfc6458, 5.3.5. SCTP_RCVINFO cmsg support

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This patch implements section 5.3.5. of RFC6458, that is, support
for 'SCTP Receive Information Structure' (SCTP_RCVINFO) which is
placed into ancillary data cmsghdr structure for each recvmsg()
call.

This option can be enabled/disabled via setsockopt(2) on SOL_SCTP
level by setting an int value with 1/0 for SCTP_RECVRCVINFO in user
space applications as per RFC6458, section 8.1.29.

The sctp_rcvinfo structure is defined as per RFC as below ...

  struct sctp_rcvinfo {
    uint16_t rcv_sid;
    uint16_t rcv_ssn;
    uint16_t rcv_flags;
    <-- 2 bytes hole  -->
    uint32_t rcv_ppid;
    uint32_t rcv_tsn;
    uint32_t rcv_cumtsn;
    uint32_t rcv_context;
    sctp_assoc_t rcv_assoc_id;
  };

... and provided under cmsg_level IPPROTO_SCTP, cmsg_type
SCTP_RCVINFO, while cmsg_data[] contains struct sctp_rcvinfo.
An sctp_rcvinfo item always corresponds to the data in msg_iov.

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>
This commit is contained in:
Geir Ola Vaagland 2014-07-12 20:30:37 +02:00 • committed by David S. Miller
parent 63b949382c
commit 0d3a421d28
5 changed files with 105 additions and 9 deletions
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3
include/net/sctp/structs.h
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@ -207,7 +207,9 @@ struct sctp_sock {
struct sctp_paddrparams paddrparam;
struct sctp_event_subscribe subscribe;
struct sctp_assocparams assocparams;
int user_frag;
__u32 autoclose;
__u8 nodelay;
__u8 disable_fragments;
@ -215,6 +217,7 @@ struct sctp_sock {
__u8 frag_interleave;
__u32 adaptation_ind;
__u32 pd_point;
__u8 recvrcvinfo;
atomic_t pd_mode;
/* Receive to here while partial delivery is in effect. */