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sctp: add support for SCTP AUTH Information for sendmsg

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This patch is to add support for SCTP AUTH Information for sendmsg,
as described in section 5.3.8 of RFC6458.

With this option, you can provide shared key identifier used for
sending the user message.

It's also a necessary send info for sctp_sendv.

Note that it reuses sinfo->sinfo_tsn to indicate if this option is
set and sinfo->sinfo_ssn to save the shkey ID which can be 0.

Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Xin Long
2018-03-14 19:05:31 +08:00
committed by David S. Miller
parent 1b1e0bc994
commit 3ff547c06a
4 changed files with 47 additions and 2 deletions
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14
include/uapi/linux/sctp.h
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@@ -273,6 +273,18 @@ struct sctp_prinfo {
__u32 pr_value;
};
/* 5.3.8 SCTP AUTH Information Structure (SCTP_AUTHINFO)
*
* This cmsghdr structure specifies SCTP options for sendmsg().
*
* cmsg_level cmsg_type cmsg_data[]
* ------------ ------------ -------------------
* IPPROTO_SCTP SCTP_AUTHINFO struct sctp_authinfo
*/
struct sctp_authinfo {
__u16 auth_keynumber;
};
/*
* sinfo_flags: 16 bits (unsigned integer)
*
@@ -310,7 +322,7 @@ typedef enum sctp_cmsg_type {
#define SCTP_NXTINFO SCTP_NXTINFO
SCTP_PRINFO, /* 5.3.7 SCTP PR-SCTP Information Structure */
#define SCTP_PRINFO SCTP_PRINFO
SCTP_AUTHINFO, /* 5.3.8 SCTP AUTH Information Structure (RESERVED) */
SCTP_AUTHINFO, /* 5.3.8 SCTP AUTH Information Structure */
#define SCTP_AUTHINFO SCTP_AUTHINFO
SCTP_DSTADDRV4, /* 5.3.9 SCTP Destination IPv4 Address Structure */
#define SCTP_DSTADDRV4 SCTP_DSTADDRV4