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