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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
Download Patch File Download Diff File Expand all files Collapse all files

32
include/uapi/linux/sctp.h
View File

@@ -95,6 +95,7 @@ typedef __s32 sctp_assoc_t;
#define SCTP_GET_ASSOC_ID_LIST 29 /* Read only */
#define SCTP_AUTO_ASCONF 30
#define SCTP_PEER_ADDR_THLDS 31
#define SCTP_RECVRCVINFO 32
/* Internal Socket Options. Some of the sctp library functions are
* implemented using these socket options.
@@ -110,8 +111,7 @@ typedef __s32 sctp_assoc_t;
#define SCTP_SOCKOPT_CONNECTX3 111 /* CONNECTX requests (updated) */
#define SCTP_GET_ASSOC_STATS 112 /* Read only */
/*
* 5.2.1 SCTP Initiation Structure (SCTP_INIT)
/* 5.3.1 SCTP Initiation Structure (SCTP_INIT)
*
* This cmsghdr structure provides information for initializing new
* SCTP associations with sendmsg(). The SCTP_INITMSG socket option
@@ -121,7 +121,6 @@ typedef __s32 sctp_assoc_t;
* cmsg_level cmsg_type cmsg_data[]
* ------------ ------------ ----------------------
* IPPROTO_SCTP SCTP_INIT struct sctp_initmsg
*
*/
struct sctp_initmsg {
__u16 sinit_num_ostreams;
@@ -130,8 +129,7 @@ struct sctp_initmsg {
__u16 sinit_max_init_timeo;
};
/*
* 5.2.2 SCTP Header Information Structure (SCTP_SNDRCV)
/* 5.3.2 SCTP Header Information Structure (SCTP_SNDRCV)
*
* This cmsghdr structure specifies SCTP options for sendmsg() and
* describes SCTP header information about a received message through
@@ -140,7 +138,6 @@ struct sctp_initmsg {
* cmsg_level cmsg_type cmsg_data[]
* ------------ ------------ ----------------------
* IPPROTO_SCTP SCTP_SNDRCV struct sctp_sndrcvinfo
*
*/
struct sctp_sndrcvinfo {
__u16 sinfo_stream;
@@ -170,13 +167,32 @@ struct sctp_sndinfo {
sctp_assoc_t snd_assoc_id;
};
/* 5.3.5 SCTP Receive Information Structure (SCTP_RCVINFO)
*
* This cmsghdr structure describes SCTP receive information
* about a received message through recvmsg().
*
* cmsg_level cmsg_type cmsg_data[]
* ------------ ------------ -------------------
* IPPROTO_SCTP SCTP_RCVINFO struct sctp_rcvinfo
*/
struct sctp_rcvinfo {
__u16 rcv_sid;
__u16 rcv_ssn;
__u16 rcv_flags;
__u32 rcv_ppid;
__u32 rcv_tsn;
__u32 rcv_cumtsn;
__u32 rcv_context;
sctp_assoc_t rcv_assoc_id;
};
/*
* sinfo_flags: 16 bits (unsigned integer)
*
* This field may contain any of the following flags and is composed of
* a bitwise OR of these values.
*/
enum sctp_sinfo_flags {
SCTP_UNORDERED = 1, /* Send/receive message unordered. */
SCTP_ADDR_OVER = 2, /* Override the primary destination. */
@@ -199,6 +215,8 @@ typedef enum sctp_cmsg_type {
#define SCTP_SNDRCV SCTP_SNDRCV
SCTP_SNDINFO, /* 5.3.4 SCTP Send Information Structure */
#define SCTP_SNDINFO SCTP_SNDINFO
SCTP_RCVINFO, /* 5.3.5 SCTP Receive Information Structure */
#define SCTP_RCVINFO SCTP_RCVINFO
} sctp_cmsg_t;
/*