| /* SCTP kernel reference Implementation: User API extensions. |
| * |
| * sendmsg.c |
| * |
| * Distributed under the terms of the LGPL v2.1 as described in |
| * http://www.gnu.org/copyleft/lesser.txt |
| * |
| * This file is part of the user library that offers support for the |
| * SCTP kernel reference Implementation. The main purpose of this |
| * code is to provide the SCTP Socket API mappings for user |
| * application to interface with the SCTP in kernel. |
| * |
| * This implementation is based on the Socket API Extensions for SCTP |
| * defined in <draft-ietf-tsvwg-sctpsocket-10.txt> |
| * |
| * Copyright (c) 2003 Intel Corp. |
| * |
| * Written or modified by: |
| * Ardelle Fan <ardelle.fan@intel.com> |
| */ |
| |
| #include <string.h> |
| #include <sys/socket.h> /* struct sockaddr_storage, setsockopt() */ |
| #include <netinet/sctp.h> |
| |
| /* This library function assists the user with the advanced features |
| * of SCTP. This is a new SCTP API described in the section 8.7 of the |
| * Sockets API Extensions for SCTP. This is implemented using the |
| * sendmsg() interface. |
| */ |
| int |
| sctp_sendmsg(int s, const void *msg, size_t len, struct sockaddr *to, |
| socklen_t tolen, uint32_t ppid, uint32_t flags, |
| uint16_t stream_no, uint32_t timetolive, uint32_t context) |
| { |
| struct msghdr outmsg; |
| struct iovec iov; |
| char outcmsg[CMSG_SPACE(sizeof(struct sctp_sndrcvinfo))]; |
| struct cmsghdr *cmsg; |
| struct sctp_sndrcvinfo *sinfo; |
| |
| outmsg.msg_name = to; |
| outmsg.msg_namelen = tolen; |
| outmsg.msg_iov = &iov; |
| iov.iov_base = (void *)msg; |
| iov.iov_len = len; |
| outmsg.msg_iovlen = 1; |
| |
| outmsg.msg_control = outcmsg; |
| outmsg.msg_controllen = sizeof(outcmsg); |
| outmsg.msg_flags = 0; |
| |
| cmsg = CMSG_FIRSTHDR(&outmsg); |
| cmsg->cmsg_level = IPPROTO_SCTP; |
| cmsg->cmsg_type = SCTP_SNDRCV; |
| cmsg->cmsg_len = CMSG_LEN(sizeof(struct sctp_sndrcvinfo)); |
| |
| outmsg.msg_controllen = cmsg->cmsg_len; |
| sinfo = (struct sctp_sndrcvinfo *)CMSG_DATA(cmsg); |
| memset(sinfo, 0, sizeof(struct sctp_sndrcvinfo)); |
| sinfo->sinfo_ppid = ppid; |
| sinfo->sinfo_flags = flags; |
| sinfo->sinfo_stream = stream_no; |
| sinfo->sinfo_timetolive = timetolive; |
| sinfo->sinfo_context = context; |
| |
| return sendmsg(s, &outmsg, 0); |
| } |
| |
| /* This library function assist the user with sending a message without |
| * dealing directly with the CMSG header. |
| */ |
| int |
| sctp_send(int s, const void *msg, size_t len, |
| const struct sctp_sndrcvinfo *sinfo, int flags) |
| { |
| struct msghdr outmsg; |
| struct iovec iov; |
| |
| outmsg.msg_name = NULL; |
| outmsg.msg_namelen = 0; |
| outmsg.msg_iov = &iov; |
| iov.iov_base = (void *)msg; |
| iov.iov_len = len; |
| outmsg.msg_iovlen = 1; |
| outmsg.msg_controllen = 0; |
| |
| if (sinfo) { |
| char outcmsg[CMSG_SPACE(sizeof(struct sctp_sndrcvinfo))]; |
| struct cmsghdr *cmsg; |
| |
| outmsg.msg_control = outcmsg; |
| outmsg.msg_controllen = sizeof(outcmsg); |
| outmsg.msg_flags = 0; |
| |
| cmsg = CMSG_FIRSTHDR(&outmsg); |
| cmsg->cmsg_level = IPPROTO_SCTP; |
| cmsg->cmsg_type = SCTP_SNDRCV; |
| cmsg->cmsg_len = CMSG_LEN(sizeof(struct sctp_sndrcvinfo)); |
| |
| outmsg.msg_controllen = cmsg->cmsg_len; |
| memcpy(CMSG_DATA(cmsg), sinfo, sizeof(struct sctp_sndrcvinfo)); |
| } |
| |
| return sendmsg(s, &outmsg, flags); |
| } |