sctp_module.c

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/*-
 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
 *
 * Copyright (c) 2019-2020 The FreeBSD Foundation
 *
 * This software was developed by Mark Johnston under sponsorship from
 * the FreeBSD Foundation.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */
 
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
 
#include "opt_inet.h"
#include "opt_inet6.h"
 
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/protosw.h>
#include <sys/socket.h>
 
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/ip_var.h>
#include <netinet/sctp.h>
#include <netinet/sctp_pcb.h>
#include <netinet/sctp_var.h>
#include <netinet/sctp_os_bsd.h>
 
#include <netinet6/ip6_var.h>
#include <netinet6/sctp6_var.h>
 
#ifdef INET
extern struct domain inetdomain;
 
struct protosw sctp_stream_protosw = {
        .pr_type =              SOCK_STREAM,
        .pr_domain =            &inetdomain,
        .pr_protocol =          IPPROTO_SCTP,
        .pr_flags =             PR_CONNREQUIRED|PR_WANTRCVD|PR_LASTHDR,
        .pr_input =             sctp_input,
        .pr_ctlinput =          sctp_ctlinput,
        .pr_ctloutput =         sctp_ctloutput,
        .pr_drain =             sctp_drain,
        .pr_usrreqs =           &sctp_usrreqs,
};
 
struct protosw sctp_seqpacket_protosw = {
        .pr_type =              SOCK_SEQPACKET,
        .pr_domain =            &inetdomain,
        .pr_protocol =          IPPROTO_SCTP,
        .pr_flags =             PR_WANTRCVD|PR_LASTHDR,
        .pr_input =             sctp_input,
        .pr_ctlinput =          sctp_ctlinput,
        .pr_ctloutput =         sctp_ctloutput,
        .pr_drain =             sctp_drain,
        .pr_usrreqs =           &sctp_usrreqs,
};
#endif
 
#ifdef INET6
extern struct domain inet6domain;
 
struct protosw sctp6_stream_protosw = {
        .pr_type =              SOCK_STREAM,
        .pr_domain =            &inet6domain,
        .pr_protocol =          IPPROTO_SCTP,
        .pr_flags =             PR_CONNREQUIRED|PR_WANTRCVD|PR_LASTHDR,
        .pr_input =             sctp6_input,
        .pr_ctlinput =          sctp6_ctlinput,
        .pr_ctloutput =         sctp_ctloutput,
        .pr_drain =             sctp_drain,
        .pr_usrreqs =           &sctp6_usrreqs,
};
 
struct protosw sctp6_seqpacket_protosw = {
        .pr_type =              SOCK_SEQPACKET,
        .pr_domain =            &inet6domain,
        .pr_protocol =          IPPROTO_SCTP,
        .pr_flags =             PR_WANTRCVD|PR_LASTHDR,
        .pr_input =             sctp6_input,
        .pr_ctlinput =          sctp6_ctlinput,
        .pr_ctloutput =         sctp_ctloutput,
#ifndef INET    /* Do not call initialization and drain routines twice. */
        .pr_drain =             sctp_drain,
#endif
        .pr_usrreqs =           &sctp6_usrreqs,
};
#endif
 
static int
sctp_module_load(void)
{
        int error;
 
#ifdef INET
        error = pf_proto_register(PF_INET, &sctp_stream_protosw);
        if (error != 0)
                return (error);
        error = pf_proto_register(PF_INET, &sctp_seqpacket_protosw);
        if (error != 0)
                return (error);
        error = ipproto_register(IPPROTO_SCTP);
        if (error != 0)
                return (error);
#endif
#ifdef INET6
        error = pf_proto_register(PF_INET6, &sctp6_stream_protosw);
        if (error != 0)
                return (error);
        error = pf_proto_register(PF_INET6, &sctp6_seqpacket_protosw);
        if (error != 0)
                return (error);
        error = ip6proto_register(IPPROTO_SCTP);
        if (error != 0)
                return (error);
#endif
        error = sctp_syscalls_init();
        if (error != 0)
                return (error);
        return (0);
}
 
static int __unused
sctp_module_unload(void)
{
 
        (void)sctp_syscalls_uninit();
 
#ifdef INET
        (void)ipproto_unregister(IPPROTO_SCTP);
        (void)pf_proto_unregister(PF_INET, IPPROTO_SCTP, SOCK_STREAM);
        (void)pf_proto_unregister(PF_INET, IPPROTO_SCTP, SOCK_SEQPACKET);
#endif
#ifdef INET6
        (void)ip6proto_unregister(IPPROTO_SCTP);
        (void)pf_proto_unregister(PF_INET6, IPPROTO_SCTP, SOCK_STREAM);
        (void)pf_proto_unregister(PF_INET6, IPPROTO_SCTP, SOCK_SEQPACKET);
#endif
        return (0);
}
 
static int
sctp_modload(struct module *module, int cmd, void *arg)
{
        int error;
 
        switch (cmd) {
        case MOD_LOAD:
                error = sctp_module_load();
                break;
        case MOD_UNLOAD:
                /*
                 * Unloading SCTP is currently unsupported.  Currently, SCTP
                 * iterator threads are not stopped during unload.
                 */
                error = EOPNOTSUPP;
                break;
        default:
                error = 0;
                break;
        }
        return (error);
}
 
static moduledata_t sctp_mod = {
        "sctp",
        &sctp_modload,
        NULL,
};
 
DECLARE_MODULE(sctp, sctp_mod, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY);
MODULE_VERSION(sctp, 1);