/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved.
 */

#include <sys/types.h>
#include <sys/systm.h>
#include <sys/stream.h>
#include <sys/cmn_err.h>
#include <sys/tihdr.h>
#include <sys/kmem.h>
#define _SUN_TPI_VERSION 2
#include <sys/tihdr.h>
#include <sys/socket.h>

#include <netinet/in.h>
#include <netinet/sctp.h>

#include <inet/common.h>
#include <inet/ipclassifier.h>
#include <inet/ip.h>

#include "sctp_impl.h"

/* ARGSUSED */
static void
sctp_notify(sctp_t *sctp, mblk_t *emp, size_t len)
{
        struct T_unitdata_ind *tudi;
        mblk_t *mp;
        sctp_faddr_t *fp;
        int32_t rwnd = 0;
        int error;
        conn_t *connp = sctp->sctp_connp;

        if ((mp = allocb(sizeof (*tudi) + sizeof (void *) +
                sizeof (struct sockaddr_in6), BPRI_HI)) == NULL) {
                /* XXX trouble: don't want to drop events. should queue it. */
                freemsg(emp);
                return;
        }
        dprint(3, ("sctp_notify: event %d\n", (*(uint16_t *)emp->b_rptr)));

        mp->b_datap->db_type = M_PROTO;
        mp->b_flag |= MSGMARK;
        mp->b_rptr += sizeof (void *); /* pointer worth of padding */

        tudi = (struct T_unitdata_ind *)mp->b_rptr;
        tudi->PRIM_type = T_UNITDATA_IND;
        tudi->SRC_offset = sizeof (*tudi);
        tudi->OPT_length = 0;
        tudi->OPT_offset = 0;

        fp = sctp->sctp_primary;
        ASSERT(fp);

        /*
         * Fill in primary remote address.
         */
        if (IN6_IS_ADDR_V4MAPPED(&fp->sf_faddr)) {
                struct sockaddr_in *sin4;

                tudi->SRC_length = sizeof (*sin4);
                sin4 = (struct sockaddr_in *)(tudi + 1);
                sin4->sin_family = AF_INET;
                sin4->sin_port = connp->conn_fport;
                IN6_V4MAPPED_TO_IPADDR(&fp->sf_faddr, sin4->sin_addr.s_addr);
                mp->b_wptr = (uchar_t *)(sin4 + 1);
        } else {
                struct sockaddr_in6 *sin6;

                tudi->SRC_length = sizeof (*sin6);
                sin6 = (struct sockaddr_in6 *)(tudi + 1);
                sin6->sin6_family = AF_INET6;
                sin6->sin6_port = connp->conn_fport;
                sin6->sin6_addr = fp->sf_faddr;
                mp->b_wptr = (uchar_t *)(sin6 + 1);
        }

        mp->b_cont = emp;

        /*
         * Notifications are queued regardless of socket rx space.  So
         * we do not decrement sctp_rwnd here as this will confuse the
         * other side.
         */
#ifdef DEBUG
        for (emp = mp->b_cont; emp; emp = emp->b_cont) {
                rwnd += emp->b_wptr - emp->b_rptr;
        }
        ASSERT(len == rwnd);
#endif

        /*
         * Override b_flag for SCTP sockfs internal use
         */
        mp->b_flag = (short)SCTP_NOTIFICATION;

        rwnd = sctp->sctp_ulp_recv(sctp->sctp_ulpd, mp, msgdsize(mp), 0,
            &error, NULL);
        if (rwnd > sctp->sctp_rwnd) {
                sctp->sctp_rwnd = rwnd;
        }
}

void
sctp_assoc_event(sctp_t *sctp, uint16_t state, uint16_t error,
    sctp_chunk_hdr_t *ch)
{
        struct sctp_assoc_change *sacp;
        mblk_t *mp;
        uint16_t ch_len;

        if (!sctp->sctp_recvassocevnt) {
                return;
        }

        ch_len = (ch != NULL) ? ntohs(ch->sch_len) : 0;

        if ((mp = allocb(sizeof (*sacp) + ch_len, BPRI_MED)) == NULL) {
                return;
        }

        sacp = (struct sctp_assoc_change *)mp->b_rptr;
        sacp->sac_type = SCTP_ASSOC_CHANGE;
        sacp->sac_flags = sctp->sctp_prsctp_aware ? SCTP_PRSCTP_CAPABLE : 0;
        sacp->sac_length = sizeof (*sacp) + ch_len;
        sacp->sac_state = state;
        sacp->sac_error = error;
        sacp->sac_outbound_streams = sctp->sctp_num_ostr;
        sacp->sac_inbound_streams = sctp->sctp_num_istr;
        sacp->sac_assoc_id = 0;

        if (ch != NULL)
                bcopy(ch, sacp + 1, ch_len);
        mp->b_wptr += sacp->sac_length;
        sctp_notify(sctp, mp, sacp->sac_length);
}

/*
 * Send failure event. Message is expected to have message header still
 * in place, data follows in subsequent mblk's.
 */
static void
sctp_sendfail(sctp_t *sctp, mblk_t *msghdr, uint16_t flags, int error)
{
        struct sctp_send_failed *sfp;
        mblk_t *mp;
        sctp_msg_hdr_t *smh;

        /* Allocate a mblk for the notification header */
        if ((mp = allocb(sizeof (*sfp), BPRI_MED)) == NULL) {
                /* give up */
                freemsg(msghdr);
                return;
        }

        smh = (sctp_msg_hdr_t *)msghdr->b_rptr;
        sfp = (struct sctp_send_failed *)mp->b_rptr;
        sfp->ssf_type = SCTP_SEND_FAILED;
        sfp->ssf_flags = flags;
        sfp->ssf_length = smh->smh_msglen + sizeof (*sfp);
        sfp->ssf_error = error;
        sfp->ssf_assoc_id = 0;

        bzero(&sfp->ssf_info, sizeof (sfp->ssf_info));
        sfp->ssf_info.sinfo_stream = smh->smh_sid;
        sfp->ssf_info.sinfo_flags = smh->smh_flags;
        sfp->ssf_info.sinfo_ppid = smh->smh_ppid;
        sfp->ssf_info.sinfo_context = smh->smh_context;
        sfp->ssf_info.sinfo_timetolive = TICK_TO_MSEC(smh->smh_ttl);

        mp->b_wptr = (uchar_t *)(sfp + 1);
        mp->b_cont = msghdr->b_cont;

        freeb(msghdr);

        sctp_notify(sctp, mp, sfp->ssf_length);

}

/*
 * Send failure when the message has been fully chunkified.
 */
static void
sctp_sendfail_sent(sctp_t *sctp, mblk_t *meta, int error)
{
        mblk_t          *mp;
        mblk_t          *nmp;
        mblk_t          *tail;
        uint16_t        flags = SCTP_DATA_SENT;

        if (!sctp->sctp_recvsendfailevnt) {
                sctp_free_msg(meta);
                return;
        }

        /*
         * We need to remove all data_hdr's.
         */
        nmp = meta->b_cont;
        tail = meta;
        do {
                mp = nmp->b_next;
                nmp->b_next = NULL;

                /*
                 * If one of the chunks hasn't been sent yet, say that
                 * the message hasn't been sent.
                 */
                if (!SCTP_CHUNK_ISSENT(nmp)) {
                        flags = SCTP_DATA_UNSENT;
                }
                nmp->b_rptr += sizeof (sctp_data_hdr_t);
                if (nmp->b_rptr == nmp->b_wptr) {
                        tail->b_cont = nmp->b_cont;
                        freeb(nmp);
                } else {
                        tail->b_cont = nmp;
                }
                while (tail->b_cont) {
                        tail = tail->b_cont;
                }
        } while ((nmp = mp) != NULL);

        sctp_sendfail(sctp, meta, flags, error);
}

/*
 * Send failure when the message hasn't been fully chunkified.
 */
void
sctp_sendfail_event(sctp_t *sctp, mblk_t *meta, int error, boolean_t chunkified)
{
        mblk_t  *mp;
        mblk_t  *nmp;
        mblk_t  *tail;

        if (meta == NULL)
                return;

        if (!sctp->sctp_recvsendfailevnt) {
                sctp_free_msg(meta);
                return;
        }

        /* If the message is fully chunkified */
        if (chunkified) {
                sctp_sendfail_sent(sctp, meta, error);
                return;
        }
        /*
         * Message might be partially chunkified, we need to remove
         * all data_hdr's.
         */
        mp = meta->b_cont;
        tail = meta;
        while ((nmp = mp->b_next) != NULL) {
                mp->b_next = nmp->b_next;
                nmp->b_next = NULL;
                nmp->b_rptr += sizeof (sctp_data_hdr_t);
                if (nmp->b_rptr == nmp->b_wptr) {
                        tail->b_cont = nmp->b_cont;
                        freeb(nmp);
                } else {
                        tail->b_cont = nmp;
                }
                while (tail->b_cont) {
                        tail = tail->b_cont;
                }
        }
        tail->b_cont = mp;

        sctp_sendfail(sctp, meta, SCTP_DATA_UNSENT, error);
}

void
sctp_regift_xmitlist(sctp_t *sctp)
{
        mblk_t *mp;

        if (!sctp->sctp_recvsendfailevnt) {
                return;
        }

        while ((mp = sctp->sctp_xmit_head) != NULL) {
                sctp->sctp_xmit_head = mp->b_next;
                mp->b_next = NULL;
                if (sctp->sctp_xmit_head != NULL)
                        sctp->sctp_xmit_head->b_prev = NULL;
                sctp_sendfail_event(sctp, mp, 0, B_TRUE);
        }
        while ((mp = sctp->sctp_xmit_unsent) != NULL) {
                sctp->sctp_xmit_unsent = mp->b_next;
                mp->b_next = NULL;
                sctp_sendfail_event(sctp, mp, 0, B_FALSE);
        }
        sctp->sctp_xmit_tail = sctp->sctp_xmit_unsent_tail = NULL;
        sctp->sctp_unacked = sctp->sctp_unsent = 0;
}

void
sctp_intf_event(sctp_t *sctp, in6_addr_t addr, int state, int error)
{
        struct sctp_paddr_change *spc;
        ipaddr_t addr4;
        struct sockaddr_in *sin;
        struct sockaddr_in6 *sin6;
        mblk_t *mp;

        if (!sctp->sctp_recvpathevnt) {
                return;
        }

        if ((mp = allocb(sizeof (*spc), BPRI_MED)) == NULL) {
                return;
        }

        spc = (struct sctp_paddr_change *)mp->b_rptr;
        spc->spc_type = SCTP_PEER_ADDR_CHANGE;
        spc->spc_flags = 0;
        spc->spc_length = sizeof (*spc);
        if (IN6_IS_ADDR_V4MAPPED(&addr)) {
                IN6_V4MAPPED_TO_IPADDR(&addr, addr4);
                sin = (struct sockaddr_in *)&spc->spc_aaddr;
                sin->sin_family = AF_INET;
                sin->sin_port = 0;
                sin->sin_addr.s_addr = addr4;
        } else {
                sin6 = (struct sockaddr_in6 *)&spc->spc_aaddr;
                sin6->sin6_family = AF_INET6;
                sin6->sin6_port = 0;
                sin6->sin6_addr = addr;
        }
        spc->spc_state = state;
        spc->spc_error = error;
        spc->spc_assoc_id = 0;

        mp->b_wptr = (uchar_t *)(spc + 1);
        sctp_notify(sctp, mp, spc->spc_length);
}

void
sctp_error_event(sctp_t *sctp, sctp_chunk_hdr_t *ch, boolean_t is_asconf)
{
        struct sctp_remote_error *sre;
        mblk_t *mp;
        size_t len;
        sctp_parm_hdr_t *errh = NULL;
        uint16_t dlen = 0;
        uint16_t error = 0;
        void *dtail = NULL;

        if (!sctp->sctp_recvpeererr) {
                return;
        }

        /*
         * ASCONF PARM error chunks :
         * PARM_ERROR_IND parm type is always followed by correlation id.
         * See sctp_asconf_adderr() and sctp_asconf_prepend_errwrap() as to
         * how these error chunks are build.
         * error cause wrapper (PARM_ERROR_IND) + correlation id +
         * error cause + error cause details.
         *
         * Regular error chunks :
         * See sctp_make_err() as to how these error chunks are build.
         * error chunk header (CHUNK_ERROR) + error cause + error cause details.
         */
        if (is_asconf) {
                if (ntohs(ch->sch_len) >
                    (sizeof (*ch) + sizeof (uint32_t))) {
                        errh = (sctp_parm_hdr_t *)((char *)ch +
                            sizeof (uint32_t) + sizeof (sctp_parm_hdr_t));
                }
        } else {
                if (ntohs(ch->sch_len) > sizeof (*ch)) {
                        errh = (sctp_parm_hdr_t *)(ch + 1);
                }
        }

        if (errh != NULL) {
                error = ntohs(errh->sph_type);
                dlen = ntohs(errh->sph_len) - sizeof (*errh);
                if (dlen > 0) {
                        dtail = errh + 1;
                }
        }

        len = sizeof (*sre) + dlen;
        if ((mp = allocb(len, BPRI_MED)) == NULL) {
                return;
        }

        sre = (struct sctp_remote_error *)mp->b_rptr;
        sre->sre_type = SCTP_REMOTE_ERROR;
        sre->sre_flags = 0;
        sre->sre_length = len;
        sre->sre_assoc_id = 0;
        sre->sre_error = error;
        if (dtail != NULL) {
                bcopy(dtail, sre + 1, dlen);
        }

        mp->b_wptr = mp->b_rptr + len;
        sctp_notify(sctp, mp, len);
}

void
sctp_shutdown_event(sctp_t *sctp)
{
        struct sctp_shutdown_event *sse;
        mblk_t *mp;

        if (!sctp->sctp_recvshutdownevnt) {
                return;
        }

        if ((mp = allocb(sizeof (*sse), BPRI_MED)) == NULL) {
                return;
        }

        sse = (struct sctp_shutdown_event *)mp->b_rptr;
        sse->sse_type = SCTP_SHUTDOWN_EVENT;
        sse->sse_flags = 0;
        sse->sse_length = sizeof (*sse);
        sse->sse_assoc_id = 0;

        mp->b_wptr = (uchar_t *)(sse + 1);
        sctp_notify(sctp, mp, sse->sse_length);
}

void
sctp_adaptation_event(sctp_t *sctp)
{
        struct sctp_adaptation_event *sai;
        mblk_t *mp;

        if (!sctp->sctp_recvalevnt || !sctp->sctp_recv_adaptation) {
                return;
        }
        if ((mp = allocb(sizeof (*sai), BPRI_MED)) == NULL) {
                return;
        }

        sai = (struct sctp_adaptation_event *)mp->b_rptr;
        sai->sai_type = SCTP_ADAPTATION_INDICATION;
        sai->sai_flags = 0;
        sai->sai_length = sizeof (*sai);
        sai->sai_assoc_id = 0;
        /*
         * Adaptation code delivered in network byte order.
         */
        sai->sai_adaptation_ind = sctp->sctp_rx_adaptation_code;

        mp->b_wptr = (uchar_t *)(sai + 1);
        sctp_notify(sctp, mp, sai->sai_length);

        sctp->sctp_recv_adaptation = 0; /* in case there's a restart later */
}

/* Send partial deliver event */
void
sctp_partial_delivery_event(sctp_t *sctp)
{
        struct sctp_pdapi_event *pdapi;
        mblk_t                  *mp;

        if (!sctp->sctp_recvpdevnt)
                return;

        if ((mp = allocb(sizeof (*pdapi), BPRI_MED)) == NULL)
                return;

        pdapi = (struct sctp_pdapi_event *)mp->b_rptr;
        pdapi->pdapi_type = SCTP_PARTIAL_DELIVERY_EVENT;
        pdapi->pdapi_flags = 0;
        pdapi->pdapi_length = sizeof (*pdapi);
        pdapi->pdapi_indication = SCTP_PARTIAL_DELIVERY_ABORTED;
        pdapi->pdapi_assoc_id = 0;
        mp->b_wptr = (uchar_t *)(pdapi + 1);
        sctp_notify(sctp, mp, pdapi->pdapi_length);
}