From 63b949382c5f263746b1c177f6ff84de2201ae9d Mon Sep 17 00:00:00 2001 From: Geir Ola Vaagland Date: Sat, 12 Jul 2014 20:30:36 +0200 Subject: net: sctp: implement rfc6458, 5.3.4. SCTP_SNDINFO cmsg support This patch implements section 5.3.4. of RFC6458, that is, support for 'SCTP Send Information Structure' (SCTP_SNDINFO) which can be placed into ancillary data cmsghdr structure for sendmsg() calls. The sctp_sndinfo structure is defined as per RFC as below ... struct sctp_sndinfo { uint16_t snd_sid; uint16_t snd_flags; uint32_t snd_ppid; uint32_t snd_context; sctp_assoc_t snd_assoc_id; }; ... and supplied under cmsg_level IPPROTO_SCTP, cmsg_type SCTP_SNDINFO, while cmsg_data[] contains struct sctp_sndinfo. An sctp_sndinfo 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/uapi/linux/sctp.h | 22 ++++++++++++++++++++-- 1 file changed, 20 insertions(+), 2 deletions(-) (limited to 'include/uapi/linux') diff --git a/include/uapi/linux/sctp.h b/include/uapi/linux/sctp.h index 266022a2be4a..a387761f7e02 100644 --- a/include/uapi/linux/sctp.h +++ b/include/uapi/linux/sctp.h @@ -154,6 +154,22 @@ struct sctp_sndrcvinfo { sctp_assoc_t sinfo_assoc_id; }; +/* 5.3.4 SCTP Send Information Structure (SCTP_SNDINFO) + * + * This cmsghdr structure specifies SCTP options for sendmsg(). + * + * cmsg_level cmsg_type cmsg_data[] + * ------------ ------------ ------------------- + * IPPROTO_SCTP SCTP_SNDINFO struct sctp_sndinfo + */ +struct sctp_sndinfo { + __u16 snd_sid; + __u16 snd_flags; + __u32 snd_ppid; + __u32 snd_context; + sctp_assoc_t snd_assoc_id; +}; + /* * sinfo_flags: 16 bits (unsigned integer) * @@ -177,10 +193,12 @@ typedef union { /* These are cmsg_types. */ typedef enum sctp_cmsg_type { - SCTP_INIT, /* 5.2.1 SCTP Initiation Structure */ + SCTP_INIT, /* 5.2.1 SCTP Initiation Structure */ #define SCTP_INIT SCTP_INIT - SCTP_SNDRCV, /* 5.2.2 SCTP Header Information Structure */ + SCTP_SNDRCV, /* 5.2.2 SCTP Header Information Structure */ #define SCTP_SNDRCV SCTP_SNDRCV + SCTP_SNDINFO, /* 5.3.4 SCTP Send Information Structure */ +#define SCTP_SNDINFO SCTP_SNDINFO } sctp_cmsg_t; /* -- cgit v1.2.3