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/uapi/linux/sctp.h | 32 +++++++++++++++++++++++++------- 1 file changed, 25 insertions(+), 7 deletions(-) (limited to 'include/uapi/linux') diff --git a/include/uapi/linux/sctp.h b/include/uapi/linux/sctp.h index a387761f7e02..29b81bbfc53d 100644 --- a/include/uapi/linux/sctp.h +++ b/include/uapi/linux/sctp.h @@ -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; /* -- cgit v1.2.3