From 0d3a421d284812d07970b4ccee74d4fa38737e4d Mon Sep 17 00:00:00 2001 From: Geir Ola Vaagland Date: Sat, 12 Jul 2014 20:30:37 +0200 Subject: net: sctp: implement rfc6458, 5.3.5. SCTP_RCVINFO cmsg support 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 Signed-off-by: Daniel Borkmann Signed-off-by: David S. Miller --- include/net/sctp/structs.h | 3 +++ 1 file changed, 3 insertions(+) (limited to 'include/net/sctp/structs.h') diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h index 7af9a0f5d8ce..11d5df015370 100644 --- a/include/net/sctp/structs.h +++ b/include/net/sctp/structs.h @@ -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. */ -- cgit v1.2.3