1*0Sstevel@tonic-gate /* 2*0Sstevel@tonic-gate * CDDL HEADER START 3*0Sstevel@tonic-gate * 4*0Sstevel@tonic-gate * The contents of this file are subject to the terms of the 5*0Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only 6*0Sstevel@tonic-gate * (the "License"). You may not use this file except in compliance 7*0Sstevel@tonic-gate * with the License. 8*0Sstevel@tonic-gate * 9*0Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10*0Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 11*0Sstevel@tonic-gate * See the License for the specific language governing permissions 12*0Sstevel@tonic-gate * and limitations under the License. 13*0Sstevel@tonic-gate * 14*0Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 15*0Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16*0Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 17*0Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 18*0Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 19*0Sstevel@tonic-gate * 20*0Sstevel@tonic-gate * CDDL HEADER END 21*0Sstevel@tonic-gate */ 22*0Sstevel@tonic-gate /* 23*0Sstevel@tonic-gate * Copyright 2004 Sun Microsystems, Inc. All rights reserved. 24*0Sstevel@tonic-gate * Use is subject to license terms. 25*0Sstevel@tonic-gate */ 26*0Sstevel@tonic-gate 27*0Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI" 28*0Sstevel@tonic-gate 29*0Sstevel@tonic-gate #include <sys/types.h> 30*0Sstevel@tonic-gate #include <sys/systm.h> 31*0Sstevel@tonic-gate #include <sys/stream.h> 32*0Sstevel@tonic-gate #include <sys/cmn_err.h> 33*0Sstevel@tonic-gate #define _SUN_TPI_VERSION 2 34*0Sstevel@tonic-gate #include <sys/tihdr.h> 35*0Sstevel@tonic-gate #include <sys/socket.h> 36*0Sstevel@tonic-gate #include <sys/stropts.h> 37*0Sstevel@tonic-gate #include <sys/strsun.h> 38*0Sstevel@tonic-gate #include <sys/strsubr.h> 39*0Sstevel@tonic-gate #include <sys/socketvar.h> 40*0Sstevel@tonic-gate 41*0Sstevel@tonic-gate #include <netinet/in.h> 42*0Sstevel@tonic-gate #include <netinet/ip6.h> 43*0Sstevel@tonic-gate #include <netinet/tcp_seq.h> 44*0Sstevel@tonic-gate #include <netinet/sctp.h> 45*0Sstevel@tonic-gate 46*0Sstevel@tonic-gate #include <inet/common.h> 47*0Sstevel@tonic-gate #include <inet/mi.h> 48*0Sstevel@tonic-gate #include <inet/ip.h> 49*0Sstevel@tonic-gate #include <inet/ip6.h> 50*0Sstevel@tonic-gate #include <inet/ip_ire.h> 51*0Sstevel@tonic-gate #include <inet/sctp_ip.h> 52*0Sstevel@tonic-gate #include <inet/ipclassifier.h> 53*0Sstevel@tonic-gate 54*0Sstevel@tonic-gate /* 55*0Sstevel@tonic-gate * PR-SCTP comments. 56*0Sstevel@tonic-gate * 57*0Sstevel@tonic-gate * A message can expire before it gets to the transmit list (i.e. it is still 58*0Sstevel@tonic-gate * in the unsent list - unchunked), after it gets to the transmit list, but 59*0Sstevel@tonic-gate * before transmission has actually started, or after transmission has begun. 60*0Sstevel@tonic-gate * Accordingly, we check for the status of a message in sctp_chunkify() when 61*0Sstevel@tonic-gate * the message is being transferred from the unsent list to the transmit list; 62*0Sstevel@tonic-gate * in sctp_get_msg_to_send(), when we get the next chunk from the transmit 63*0Sstevel@tonic-gate * list and in sctp_rexmit() when we get the next chunk to be (re)transmitted. 64*0Sstevel@tonic-gate * When we nuke a message in sctp_chunkify(), all we need to do is take it 65*0Sstevel@tonic-gate * out of the unsent list and update sctp_unsent; when a message is deemed 66*0Sstevel@tonic-gate * timed-out in sctp_get_msg_to_send() we can just take it out of the transmit 67*0Sstevel@tonic-gate * list, update sctp_unsent IFF transmission for the message has not yet begun 68*0Sstevel@tonic-gate * (i.e. !SCTP_CHUNK_ISSENT(meta->b_cont)). However, if transmission for the 69*0Sstevel@tonic-gate * message has started, then we cannot just take it out of the list, we need 70*0Sstevel@tonic-gate * to send Forward TSN chunk to the peer so that the peer can clear its 71*0Sstevel@tonic-gate * fragment list for this message. However, we cannot just send the Forward 72*0Sstevel@tonic-gate * TSN in sctp_get_msg_to_send() because there might be unacked chunks for 73*0Sstevel@tonic-gate * messages preceeding this abandoned message. So, we send a Forward TSN 74*0Sstevel@tonic-gate * IFF all messages prior to this abandoned message has been SACKd, if not 75*0Sstevel@tonic-gate * we defer sending the Forward TSN to sctp_cumack(), which will check for 76*0Sstevel@tonic-gate * this condition and send the Forward TSN via sctp_check_abandoned_msg(). In 77*0Sstevel@tonic-gate * sctp_rexmit() when we check for retransmissions, we need to determine if 78*0Sstevel@tonic-gate * the advanced peer ack point can be moved ahead, and if so, send a Forward 79*0Sstevel@tonic-gate * TSN to the peer instead of retransmitting the chunk. Note that when 80*0Sstevel@tonic-gate * we send a Forward TSN for a message, there may be yet unsent chunks for 81*0Sstevel@tonic-gate * this message; we need to mark all such chunks as abandoned, so that 82*0Sstevel@tonic-gate * sctp_cumack() can take the message out of the transmit list, additionally 83*0Sstevel@tonic-gate * sctp_unsent need to be adjusted. Whenever sctp_unsent is updated (i.e. 84*0Sstevel@tonic-gate * decremented when a message/chunk is deemed abandoned), sockfs needs to 85*0Sstevel@tonic-gate * be notified so that it can adjust its idea of the queued message. 86*0Sstevel@tonic-gate */ 87*0Sstevel@tonic-gate 88*0Sstevel@tonic-gate #include "sctp_impl.h" 89*0Sstevel@tonic-gate 90*0Sstevel@tonic-gate static struct kmem_cache *sctp_kmem_ftsn_set_cache; 91*0Sstevel@tonic-gate 92*0Sstevel@tonic-gate /* Padding mblk for SCTP chunks. */ 93*0Sstevel@tonic-gate mblk_t *sctp_pad_mp; 94*0Sstevel@tonic-gate 95*0Sstevel@tonic-gate #ifdef DEBUG 96*0Sstevel@tonic-gate static boolean_t sctp_verify_chain(mblk_t *, mblk_t *); 97*0Sstevel@tonic-gate #endif 98*0Sstevel@tonic-gate 99*0Sstevel@tonic-gate /* 100*0Sstevel@tonic-gate * Called to allocate a header mblk when sending data to SCTP. 101*0Sstevel@tonic-gate * Data will follow in b_cont of this mblk. 102*0Sstevel@tonic-gate */ 103*0Sstevel@tonic-gate mblk_t * 104*0Sstevel@tonic-gate sctp_alloc_hdr(const char *name, int nlen, const char *control, int clen, 105*0Sstevel@tonic-gate int flags) 106*0Sstevel@tonic-gate { 107*0Sstevel@tonic-gate mblk_t *mp; 108*0Sstevel@tonic-gate struct T_unitdata_req *tudr; 109*0Sstevel@tonic-gate size_t size; 110*0Sstevel@tonic-gate int error; 111*0Sstevel@tonic-gate 112*0Sstevel@tonic-gate size = sizeof (*tudr) + _TPI_ALIGN_TOPT(nlen) + clen; 113*0Sstevel@tonic-gate size = MAX(size, sizeof (sctp_msg_hdr_t)); 114*0Sstevel@tonic-gate if (flags & SCTP_CAN_BLOCK) { 115*0Sstevel@tonic-gate mp = allocb_wait(size, BPRI_MED, 0, &error); 116*0Sstevel@tonic-gate } else { 117*0Sstevel@tonic-gate mp = allocb(size, BPRI_MED); 118*0Sstevel@tonic-gate } 119*0Sstevel@tonic-gate if (mp) { 120*0Sstevel@tonic-gate tudr = (struct T_unitdata_req *)mp->b_rptr; 121*0Sstevel@tonic-gate tudr->PRIM_type = T_UNITDATA_REQ; 122*0Sstevel@tonic-gate tudr->DEST_length = nlen; 123*0Sstevel@tonic-gate tudr->DEST_offset = sizeof (*tudr); 124*0Sstevel@tonic-gate tudr->OPT_length = clen; 125*0Sstevel@tonic-gate tudr->OPT_offset = (t_scalar_t)(sizeof (*tudr) + 126*0Sstevel@tonic-gate _TPI_ALIGN_TOPT(nlen)); 127*0Sstevel@tonic-gate if (nlen > 0) 128*0Sstevel@tonic-gate bcopy(name, tudr + 1, nlen); 129*0Sstevel@tonic-gate if (clen > 0) 130*0Sstevel@tonic-gate bcopy(control, (char *)tudr + tudr->OPT_offset, clen); 131*0Sstevel@tonic-gate mp->b_wptr += (tudr ->OPT_offset + clen); 132*0Sstevel@tonic-gate mp->b_datap->db_type = M_PROTO; 133*0Sstevel@tonic-gate } 134*0Sstevel@tonic-gate return (mp); 135*0Sstevel@tonic-gate } 136*0Sstevel@tonic-gate 137*0Sstevel@tonic-gate /*ARGSUSED2*/ 138*0Sstevel@tonic-gate int 139*0Sstevel@tonic-gate sctp_sendmsg(sctp_t *sctp, mblk_t *mp, int flags) 140*0Sstevel@tonic-gate { 141*0Sstevel@tonic-gate sctp_faddr_t *fp = NULL; 142*0Sstevel@tonic-gate struct T_unitdata_req *tudr; 143*0Sstevel@tonic-gate int error = 0; 144*0Sstevel@tonic-gate mblk_t *mproto = mp; 145*0Sstevel@tonic-gate in6_addr_t *addr; 146*0Sstevel@tonic-gate in6_addr_t tmpaddr; 147*0Sstevel@tonic-gate uint16_t sid = sctp->sctp_def_stream; 148*0Sstevel@tonic-gate uint32_t ppid = sctp->sctp_def_ppid; 149*0Sstevel@tonic-gate uint32_t context = sctp->sctp_def_context; 150*0Sstevel@tonic-gate uint16_t msg_flags = sctp->sctp_def_flags; 151*0Sstevel@tonic-gate sctp_msg_hdr_t *sctp_msg_hdr; 152*0Sstevel@tonic-gate uint32_t msg_len = 0; 153*0Sstevel@tonic-gate uint32_t timetolive = sctp->sctp_def_timetolive; 154*0Sstevel@tonic-gate 155*0Sstevel@tonic-gate ASSERT(DB_TYPE(mproto) == M_PROTO); 156*0Sstevel@tonic-gate 157*0Sstevel@tonic-gate mp = mp->b_cont; 158*0Sstevel@tonic-gate ASSERT(mp == NULL || DB_TYPE(mp) == M_DATA); 159*0Sstevel@tonic-gate 160*0Sstevel@tonic-gate tudr = (struct T_unitdata_req *)mproto->b_rptr; 161*0Sstevel@tonic-gate ASSERT(tudr->PRIM_type == T_UNITDATA_REQ); 162*0Sstevel@tonic-gate 163*0Sstevel@tonic-gate /* Get destination address, if specified */ 164*0Sstevel@tonic-gate if (tudr->DEST_length > 0) { 165*0Sstevel@tonic-gate sin_t *sin; 166*0Sstevel@tonic-gate sin6_t *sin6; 167*0Sstevel@tonic-gate 168*0Sstevel@tonic-gate sin = (struct sockaddr_in *) 169*0Sstevel@tonic-gate (mproto->b_rptr + tudr->DEST_offset); 170*0Sstevel@tonic-gate switch (sin->sin_family) { 171*0Sstevel@tonic-gate case AF_INET: 172*0Sstevel@tonic-gate if (tudr->DEST_length < sizeof (*sin)) { 173*0Sstevel@tonic-gate return (EINVAL); 174*0Sstevel@tonic-gate } 175*0Sstevel@tonic-gate IN6_IPADDR_TO_V4MAPPED(sin->sin_addr.s_addr, &tmpaddr); 176*0Sstevel@tonic-gate addr = &tmpaddr; 177*0Sstevel@tonic-gate break; 178*0Sstevel@tonic-gate case AF_INET6: 179*0Sstevel@tonic-gate if (tudr->DEST_length < sizeof (*sin6)) { 180*0Sstevel@tonic-gate return (EINVAL); 181*0Sstevel@tonic-gate } 182*0Sstevel@tonic-gate sin6 = (struct sockaddr_in6 *) 183*0Sstevel@tonic-gate (mproto->b_rptr + tudr->DEST_offset); 184*0Sstevel@tonic-gate addr = &sin6->sin6_addr; 185*0Sstevel@tonic-gate break; 186*0Sstevel@tonic-gate default: 187*0Sstevel@tonic-gate return (EAFNOSUPPORT); 188*0Sstevel@tonic-gate } 189*0Sstevel@tonic-gate fp = sctp_lookup_faddr(sctp, addr); 190*0Sstevel@tonic-gate if (fp == NULL) { 191*0Sstevel@tonic-gate return (EINVAL); 192*0Sstevel@tonic-gate } 193*0Sstevel@tonic-gate } 194*0Sstevel@tonic-gate /* Ancillary Data? */ 195*0Sstevel@tonic-gate if (tudr->OPT_length > 0) { 196*0Sstevel@tonic-gate struct cmsghdr *cmsg; 197*0Sstevel@tonic-gate char *cend; 198*0Sstevel@tonic-gate struct sctp_sndrcvinfo *sndrcv; 199*0Sstevel@tonic-gate 200*0Sstevel@tonic-gate cmsg = (struct cmsghdr *)(mproto->b_rptr + tudr->OPT_offset); 201*0Sstevel@tonic-gate cend = ((char *)cmsg + tudr->OPT_length); 202*0Sstevel@tonic-gate ASSERT(cend <= (char *)mproto->b_wptr); 203*0Sstevel@tonic-gate 204*0Sstevel@tonic-gate for (;;) { 205*0Sstevel@tonic-gate if ((char *)(cmsg + 1) > cend || 206*0Sstevel@tonic-gate ((char *)cmsg + cmsg->cmsg_len) > cend) { 207*0Sstevel@tonic-gate break; 208*0Sstevel@tonic-gate } 209*0Sstevel@tonic-gate if ((cmsg->cmsg_level == IPPROTO_SCTP) && 210*0Sstevel@tonic-gate (cmsg->cmsg_type == SCTP_SNDRCV)) { 211*0Sstevel@tonic-gate if (cmsg->cmsg_len < 212*0Sstevel@tonic-gate (sizeof (*sndrcv) + sizeof (*cmsg))) { 213*0Sstevel@tonic-gate return (EINVAL); 214*0Sstevel@tonic-gate } 215*0Sstevel@tonic-gate sndrcv = (struct sctp_sndrcvinfo *)(cmsg + 1); 216*0Sstevel@tonic-gate sid = sndrcv->sinfo_stream; 217*0Sstevel@tonic-gate msg_flags = sndrcv->sinfo_flags; 218*0Sstevel@tonic-gate ppid = sndrcv->sinfo_ppid; 219*0Sstevel@tonic-gate context = sndrcv->sinfo_context; 220*0Sstevel@tonic-gate timetolive = sndrcv->sinfo_timetolive; 221*0Sstevel@tonic-gate break; 222*0Sstevel@tonic-gate } 223*0Sstevel@tonic-gate if (cmsg->cmsg_len > 0) 224*0Sstevel@tonic-gate cmsg = CMSG_NEXT(cmsg); 225*0Sstevel@tonic-gate else 226*0Sstevel@tonic-gate break; 227*0Sstevel@tonic-gate } 228*0Sstevel@tonic-gate } 229*0Sstevel@tonic-gate if (msg_flags & MSG_ABORT) { 230*0Sstevel@tonic-gate if (mp && mp->b_cont) { 231*0Sstevel@tonic-gate mblk_t *pump = msgpullup(mp, -1); 232*0Sstevel@tonic-gate if (!pump) { 233*0Sstevel@tonic-gate return (ENOMEM); 234*0Sstevel@tonic-gate } 235*0Sstevel@tonic-gate freemsg(mp); 236*0Sstevel@tonic-gate mp = pump; 237*0Sstevel@tonic-gate mproto->b_cont = mp; 238*0Sstevel@tonic-gate } 239*0Sstevel@tonic-gate RUN_SCTP(sctp); 240*0Sstevel@tonic-gate sctp_user_abort(sctp, mp, B_TRUE); 241*0Sstevel@tonic-gate sctp_clean_death(sctp, ECONNRESET); 242*0Sstevel@tonic-gate freemsg(mproto); 243*0Sstevel@tonic-gate goto process_sendq; 244*0Sstevel@tonic-gate } 245*0Sstevel@tonic-gate if (mp == NULL) 246*0Sstevel@tonic-gate goto done; 247*0Sstevel@tonic-gate 248*0Sstevel@tonic-gate RUN_SCTP(sctp); 249*0Sstevel@tonic-gate 250*0Sstevel@tonic-gate /* Reject any new data requests if we are shutting down */ 251*0Sstevel@tonic-gate if (sctp->sctp_state > SCTPS_ESTABLISHED) { 252*0Sstevel@tonic-gate error = EPIPE; 253*0Sstevel@tonic-gate goto unlock_done; 254*0Sstevel@tonic-gate } 255*0Sstevel@tonic-gate 256*0Sstevel@tonic-gate /* Re-use the mproto to store relevant info. */ 257*0Sstevel@tonic-gate ASSERT(MBLKSIZE(mproto) >= sizeof (*sctp_msg_hdr)); 258*0Sstevel@tonic-gate 259*0Sstevel@tonic-gate mproto->b_rptr = mproto->b_datap->db_base; 260*0Sstevel@tonic-gate mproto->b_wptr = mproto->b_rptr + sizeof (*sctp_msg_hdr); 261*0Sstevel@tonic-gate 262*0Sstevel@tonic-gate sctp_msg_hdr = (sctp_msg_hdr_t *)mproto->b_rptr; 263*0Sstevel@tonic-gate bzero(sctp_msg_hdr, sizeof (*sctp_msg_hdr)); 264*0Sstevel@tonic-gate sctp_msg_hdr->smh_context = context; 265*0Sstevel@tonic-gate sctp_msg_hdr->smh_sid = sid; 266*0Sstevel@tonic-gate sctp_msg_hdr->smh_ppid = ppid; 267*0Sstevel@tonic-gate sctp_msg_hdr->smh_flags = msg_flags; 268*0Sstevel@tonic-gate sctp_msg_hdr->smh_ttl = MSEC_TO_TICK(timetolive); 269*0Sstevel@tonic-gate sctp_msg_hdr->smh_tob = lbolt64; 270*0Sstevel@tonic-gate for (; mp != NULL; mp = mp->b_cont) 271*0Sstevel@tonic-gate msg_len += MBLKL(mp); 272*0Sstevel@tonic-gate sctp_msg_hdr->smh_msglen = msg_len; 273*0Sstevel@tonic-gate 274*0Sstevel@tonic-gate /* User requested specific destination */ 275*0Sstevel@tonic-gate SCTP_SET_CHUNK_DEST(mproto, fp); 276*0Sstevel@tonic-gate 277*0Sstevel@tonic-gate if (sctp->sctp_state >= SCTPS_COOKIE_ECHOED && 278*0Sstevel@tonic-gate sid >= sctp->sctp_num_ostr) { 279*0Sstevel@tonic-gate /* Send sendfail event */ 280*0Sstevel@tonic-gate sctp_sendfail_event(sctp, dupmsg(mproto), SCTP_ERR_BAD_SID, 281*0Sstevel@tonic-gate B_FALSE); 282*0Sstevel@tonic-gate error = EINVAL; 283*0Sstevel@tonic-gate goto unlock_done; 284*0Sstevel@tonic-gate } 285*0Sstevel@tonic-gate 286*0Sstevel@tonic-gate /* no data */ 287*0Sstevel@tonic-gate if (msg_len == 0) { 288*0Sstevel@tonic-gate sctp_sendfail_event(sctp, dupmsg(mproto), 289*0Sstevel@tonic-gate SCTP_ERR_NO_USR_DATA, B_FALSE); 290*0Sstevel@tonic-gate error = EINVAL; 291*0Sstevel@tonic-gate goto unlock_done; 292*0Sstevel@tonic-gate } 293*0Sstevel@tonic-gate 294*0Sstevel@tonic-gate /* Add it to the unsent list */ 295*0Sstevel@tonic-gate if (sctp->sctp_xmit_unsent == NULL) { 296*0Sstevel@tonic-gate sctp->sctp_xmit_unsent = sctp->sctp_xmit_unsent_tail = mproto; 297*0Sstevel@tonic-gate } else { 298*0Sstevel@tonic-gate sctp->sctp_xmit_unsent_tail->b_next = mproto; 299*0Sstevel@tonic-gate sctp->sctp_xmit_unsent_tail = mproto; 300*0Sstevel@tonic-gate } 301*0Sstevel@tonic-gate sctp->sctp_unsent += msg_len; 302*0Sstevel@tonic-gate BUMP_LOCAL(sctp->sctp_msgcount); 303*0Sstevel@tonic-gate if (sctp->sctp_state == SCTPS_ESTABLISHED) 304*0Sstevel@tonic-gate sctp_output(sctp); 305*0Sstevel@tonic-gate process_sendq: 306*0Sstevel@tonic-gate WAKE_SCTP(sctp); 307*0Sstevel@tonic-gate sctp_process_sendq(sctp); 308*0Sstevel@tonic-gate return (0); 309*0Sstevel@tonic-gate unlock_done: 310*0Sstevel@tonic-gate WAKE_SCTP(sctp); 311*0Sstevel@tonic-gate done: 312*0Sstevel@tonic-gate return (error); 313*0Sstevel@tonic-gate } 314*0Sstevel@tonic-gate 315*0Sstevel@tonic-gate void 316*0Sstevel@tonic-gate sctp_chunkify(sctp_t *sctp, int first_len, int bytes_to_send) 317*0Sstevel@tonic-gate { 318*0Sstevel@tonic-gate mblk_t *mp; 319*0Sstevel@tonic-gate mblk_t *chunk_mp; 320*0Sstevel@tonic-gate mblk_t *chunk_head; 321*0Sstevel@tonic-gate mblk_t *chunk_hdr; 322*0Sstevel@tonic-gate mblk_t *chunk_tail = NULL; 323*0Sstevel@tonic-gate int count; 324*0Sstevel@tonic-gate int chunksize; 325*0Sstevel@tonic-gate sctp_data_hdr_t *sdc; 326*0Sstevel@tonic-gate mblk_t *mdblk = sctp->sctp_xmit_unsent; 327*0Sstevel@tonic-gate sctp_faddr_t *fp; 328*0Sstevel@tonic-gate sctp_faddr_t *fp1; 329*0Sstevel@tonic-gate size_t xtralen; 330*0Sstevel@tonic-gate sctp_msg_hdr_t *msg_hdr; 331*0Sstevel@tonic-gate 332*0Sstevel@tonic-gate fp = SCTP_CHUNK_DEST(mdblk); 333*0Sstevel@tonic-gate if (fp == NULL) 334*0Sstevel@tonic-gate fp = sctp->sctp_current; 335*0Sstevel@tonic-gate if (fp->isv4) 336*0Sstevel@tonic-gate xtralen = sctp->sctp_hdr_len + sctp_wroff_xtra + sizeof (*sdc); 337*0Sstevel@tonic-gate else 338*0Sstevel@tonic-gate xtralen = sctp->sctp_hdr6_len + sctp_wroff_xtra + sizeof (*sdc); 339*0Sstevel@tonic-gate count = chunksize = first_len - sizeof (*sdc); 340*0Sstevel@tonic-gate nextmsg: 341*0Sstevel@tonic-gate chunk_mp = mdblk->b_cont; 342*0Sstevel@tonic-gate 343*0Sstevel@tonic-gate /* 344*0Sstevel@tonic-gate * If this partially chunked, we ignore the first_len for now 345*0Sstevel@tonic-gate * and use the one already present. For the unchunked bits, we 346*0Sstevel@tonic-gate * use the length of the last chunk. 347*0Sstevel@tonic-gate */ 348*0Sstevel@tonic-gate if (SCTP_IS_MSG_CHUNKED(mdblk)) { 349*0Sstevel@tonic-gate int chunk_len; 350*0Sstevel@tonic-gate 351*0Sstevel@tonic-gate ASSERT(chunk_mp->b_next != NULL); 352*0Sstevel@tonic-gate mdblk->b_cont = chunk_mp->b_next; 353*0Sstevel@tonic-gate chunk_mp->b_next = NULL; 354*0Sstevel@tonic-gate SCTP_MSG_CLEAR_CHUNKED(mdblk); 355*0Sstevel@tonic-gate mp = mdblk->b_cont; 356*0Sstevel@tonic-gate while (mp->b_next != NULL) 357*0Sstevel@tonic-gate mp = mp->b_next; 358*0Sstevel@tonic-gate chunk_len = ntohs(((sctp_data_hdr_t *)mp->b_rptr)->sdh_len); 359*0Sstevel@tonic-gate if (fp->sfa_pmss - chunk_len > sizeof (*sdc)) 360*0Sstevel@tonic-gate count = chunksize = fp->sfa_pmss - chunk_len; 361*0Sstevel@tonic-gate else 362*0Sstevel@tonic-gate count = chunksize = fp->sfa_pmss; 363*0Sstevel@tonic-gate count = chunksize = count - sizeof (*sdc); 364*0Sstevel@tonic-gate } else { 365*0Sstevel@tonic-gate msg_hdr = (sctp_msg_hdr_t *)mdblk->b_rptr; 366*0Sstevel@tonic-gate if (SCTP_MSG_TO_BE_ABANDONED(mdblk, msg_hdr, sctp)) { 367*0Sstevel@tonic-gate sctp->sctp_xmit_unsent = mdblk->b_next; 368*0Sstevel@tonic-gate if (sctp->sctp_xmit_unsent == NULL) 369*0Sstevel@tonic-gate sctp->sctp_xmit_unsent_tail = NULL; 370*0Sstevel@tonic-gate ASSERT(sctp->sctp_unsent >= msg_hdr->smh_msglen); 371*0Sstevel@tonic-gate sctp->sctp_unsent -= msg_hdr->smh_msglen; 372*0Sstevel@tonic-gate mdblk->b_next = NULL; 373*0Sstevel@tonic-gate BUMP_LOCAL(sctp->sctp_prsctpdrop); 374*0Sstevel@tonic-gate /* 375*0Sstevel@tonic-gate * Update ULP the amount of queued data, which is 376*0Sstevel@tonic-gate * sent-unack'ed + unsent. 377*0Sstevel@tonic-gate */ 378*0Sstevel@tonic-gate if (!SCTP_IS_DETACHED(sctp)) { 379*0Sstevel@tonic-gate sctp->sctp_ulp_xmitted(sctp->sctp_ulpd, 380*0Sstevel@tonic-gate sctp->sctp_unacked + sctp->sctp_unsent); 381*0Sstevel@tonic-gate } 382*0Sstevel@tonic-gate sctp_sendfail_event(sctp, mdblk, 0, B_FALSE); 383*0Sstevel@tonic-gate goto try_next; 384*0Sstevel@tonic-gate } 385*0Sstevel@tonic-gate mdblk->b_cont = NULL; 386*0Sstevel@tonic-gate } 387*0Sstevel@tonic-gate msg_hdr = (sctp_msg_hdr_t *)mdblk->b_rptr; 388*0Sstevel@tonic-gate nextchunk: 389*0Sstevel@tonic-gate chunk_head = chunk_mp; 390*0Sstevel@tonic-gate chunk_tail = NULL; 391*0Sstevel@tonic-gate 392*0Sstevel@tonic-gate /* Skip as many mblk's as we need */ 393*0Sstevel@tonic-gate while (chunk_mp != NULL && ((count - MBLKL(chunk_mp)) >= 0)) { 394*0Sstevel@tonic-gate count -= MBLKL(chunk_mp); 395*0Sstevel@tonic-gate chunk_tail = chunk_mp; 396*0Sstevel@tonic-gate chunk_mp = chunk_mp->b_cont; 397*0Sstevel@tonic-gate } 398*0Sstevel@tonic-gate /* Split the chain, if needed */ 399*0Sstevel@tonic-gate if (chunk_mp != NULL) { 400*0Sstevel@tonic-gate if (count > 0) { 401*0Sstevel@tonic-gate mblk_t *split_mp = dupb(chunk_mp); 402*0Sstevel@tonic-gate 403*0Sstevel@tonic-gate if (split_mp == NULL) { 404*0Sstevel@tonic-gate if (mdblk->b_cont == NULL) { 405*0Sstevel@tonic-gate mdblk->b_cont = chunk_head; 406*0Sstevel@tonic-gate } else { 407*0Sstevel@tonic-gate SCTP_MSG_SET_CHUNKED(mdblk); 408*0Sstevel@tonic-gate ASSERT(chunk_head->b_next == NULL); 409*0Sstevel@tonic-gate chunk_head->b_next = mdblk->b_cont; 410*0Sstevel@tonic-gate mdblk->b_cont = chunk_head; 411*0Sstevel@tonic-gate } 412*0Sstevel@tonic-gate return; 413*0Sstevel@tonic-gate } 414*0Sstevel@tonic-gate if (chunk_tail != NULL) { 415*0Sstevel@tonic-gate chunk_tail->b_cont = split_mp; 416*0Sstevel@tonic-gate chunk_tail = chunk_tail->b_cont; 417*0Sstevel@tonic-gate } else { 418*0Sstevel@tonic-gate chunk_head = chunk_tail = split_mp; 419*0Sstevel@tonic-gate } 420*0Sstevel@tonic-gate chunk_tail->b_wptr = chunk_tail->b_rptr + count; 421*0Sstevel@tonic-gate chunk_mp->b_rptr = chunk_tail->b_wptr; 422*0Sstevel@tonic-gate count = 0; 423*0Sstevel@tonic-gate } else if (chunk_tail == NULL) { 424*0Sstevel@tonic-gate goto next; 425*0Sstevel@tonic-gate } else { 426*0Sstevel@tonic-gate chunk_tail->b_cont = NULL; 427*0Sstevel@tonic-gate } 428*0Sstevel@tonic-gate } 429*0Sstevel@tonic-gate /* Alloc chunk hdr, if needed */ 430*0Sstevel@tonic-gate if (DB_REF(chunk_head) > 1 || 431*0Sstevel@tonic-gate ((intptr_t)chunk_head->b_rptr) & (SCTP_ALIGN - 1) || 432*0Sstevel@tonic-gate MBLKHEAD(chunk_head) < sizeof (*sdc)) { 433*0Sstevel@tonic-gate if ((chunk_hdr = allocb(xtralen, BPRI_MED)) == NULL) { 434*0Sstevel@tonic-gate if (mdblk->b_cont == NULL) { 435*0Sstevel@tonic-gate if (chunk_mp != NULL) 436*0Sstevel@tonic-gate linkb(chunk_head, chunk_mp); 437*0Sstevel@tonic-gate mdblk->b_cont = chunk_head; 438*0Sstevel@tonic-gate } else { 439*0Sstevel@tonic-gate SCTP_MSG_SET_CHUNKED(mdblk); 440*0Sstevel@tonic-gate if (chunk_mp != NULL) 441*0Sstevel@tonic-gate linkb(chunk_head, chunk_mp); 442*0Sstevel@tonic-gate ASSERT(chunk_head->b_next == NULL); 443*0Sstevel@tonic-gate chunk_head->b_next = mdblk->b_cont; 444*0Sstevel@tonic-gate mdblk->b_cont = chunk_head; 445*0Sstevel@tonic-gate } 446*0Sstevel@tonic-gate return; 447*0Sstevel@tonic-gate } 448*0Sstevel@tonic-gate chunk_hdr->b_rptr += xtralen - sizeof (*sdc); 449*0Sstevel@tonic-gate chunk_hdr->b_wptr = chunk_hdr->b_rptr + sizeof (*sdc); 450*0Sstevel@tonic-gate chunk_hdr->b_cont = chunk_head; 451*0Sstevel@tonic-gate } else { 452*0Sstevel@tonic-gate chunk_hdr = chunk_head; 453*0Sstevel@tonic-gate chunk_hdr->b_rptr -= sizeof (*sdc); 454*0Sstevel@tonic-gate } 455*0Sstevel@tonic-gate ASSERT(chunk_hdr->b_datap->db_ref == 1); 456*0Sstevel@tonic-gate sdc = (sctp_data_hdr_t *)chunk_hdr->b_rptr; 457*0Sstevel@tonic-gate sdc->sdh_id = CHUNK_DATA; 458*0Sstevel@tonic-gate sdc->sdh_flags = 0; 459*0Sstevel@tonic-gate sdc->sdh_len = htons(sizeof (*sdc) + chunksize - count); 460*0Sstevel@tonic-gate ASSERT(sdc->sdh_len); 461*0Sstevel@tonic-gate sdc->sdh_sid = htons(msg_hdr->smh_sid); 462*0Sstevel@tonic-gate /* 463*0Sstevel@tonic-gate * We defer assigning the SSN just before sending the chunk, else 464*0Sstevel@tonic-gate * if we drop the chunk in sctp_get_msg_to_send(), we would need 465*0Sstevel@tonic-gate * to send a Forward TSN to let the peer know. Some more comments 466*0Sstevel@tonic-gate * about this in sctp_impl.h for SCTP_CHUNK_SENT. 467*0Sstevel@tonic-gate */ 468*0Sstevel@tonic-gate sdc->sdh_payload_id = msg_hdr->smh_ppid; 469*0Sstevel@tonic-gate 470*0Sstevel@tonic-gate if (mdblk->b_cont == NULL) { 471*0Sstevel@tonic-gate mdblk->b_cont = chunk_hdr; 472*0Sstevel@tonic-gate SCTP_DATA_SET_BBIT(sdc); 473*0Sstevel@tonic-gate } else { 474*0Sstevel@tonic-gate mp = mdblk->b_cont; 475*0Sstevel@tonic-gate while (mp->b_next != NULL) 476*0Sstevel@tonic-gate mp = mp->b_next; 477*0Sstevel@tonic-gate mp->b_next = chunk_hdr; 478*0Sstevel@tonic-gate } 479*0Sstevel@tonic-gate 480*0Sstevel@tonic-gate bytes_to_send -= (chunksize - count); 481*0Sstevel@tonic-gate if (chunk_mp != NULL) { 482*0Sstevel@tonic-gate next: 483*0Sstevel@tonic-gate count = chunksize = fp->sfa_pmss - sizeof (*sdc); 484*0Sstevel@tonic-gate goto nextchunk; 485*0Sstevel@tonic-gate } 486*0Sstevel@tonic-gate SCTP_DATA_SET_EBIT(sdc); 487*0Sstevel@tonic-gate sctp->sctp_xmit_unsent = mdblk->b_next; 488*0Sstevel@tonic-gate if (mdblk->b_next == NULL) { 489*0Sstevel@tonic-gate sctp->sctp_xmit_unsent_tail = NULL; 490*0Sstevel@tonic-gate } 491*0Sstevel@tonic-gate mdblk->b_next = NULL; 492*0Sstevel@tonic-gate 493*0Sstevel@tonic-gate if (sctp->sctp_xmit_tail == NULL) { 494*0Sstevel@tonic-gate sctp->sctp_xmit_head = sctp->sctp_xmit_tail = mdblk; 495*0Sstevel@tonic-gate } else { 496*0Sstevel@tonic-gate mp = sctp->sctp_xmit_tail; 497*0Sstevel@tonic-gate while (mp->b_next != NULL) 498*0Sstevel@tonic-gate mp = mp->b_next; 499*0Sstevel@tonic-gate mp->b_next = mdblk; 500*0Sstevel@tonic-gate mdblk->b_prev = mp; 501*0Sstevel@tonic-gate } 502*0Sstevel@tonic-gate try_next: 503*0Sstevel@tonic-gate if (bytes_to_send > 0 && sctp->sctp_xmit_unsent != NULL) { 504*0Sstevel@tonic-gate mdblk = sctp->sctp_xmit_unsent; 505*0Sstevel@tonic-gate fp1 = SCTP_CHUNK_DEST(mdblk); 506*0Sstevel@tonic-gate if (fp1 == NULL) 507*0Sstevel@tonic-gate fp1 = sctp->sctp_current; 508*0Sstevel@tonic-gate if (fp == fp1) { 509*0Sstevel@tonic-gate size_t len = MBLKL(mdblk->b_cont); 510*0Sstevel@tonic-gate if ((count > 0) && 511*0Sstevel@tonic-gate ((len > fp->sfa_pmss - sizeof (*sdc)) || 512*0Sstevel@tonic-gate (len <= count))) { 513*0Sstevel@tonic-gate count -= sizeof (*sdc); 514*0Sstevel@tonic-gate count = chunksize = count - (count & 0x3); 515*0Sstevel@tonic-gate } else { 516*0Sstevel@tonic-gate count = chunksize = fp->sfa_pmss - 517*0Sstevel@tonic-gate sizeof (*sdc); 518*0Sstevel@tonic-gate } 519*0Sstevel@tonic-gate } else { 520*0Sstevel@tonic-gate if (fp1->isv4) 521*0Sstevel@tonic-gate xtralen = sctp->sctp_hdr_len; 522*0Sstevel@tonic-gate else 523*0Sstevel@tonic-gate xtralen = sctp->sctp_hdr6_len; 524*0Sstevel@tonic-gate xtralen += sctp_wroff_xtra + sizeof (*sdc); 525*0Sstevel@tonic-gate count = chunksize = fp1->sfa_pmss - sizeof (*sdc); 526*0Sstevel@tonic-gate fp = fp1; 527*0Sstevel@tonic-gate } 528*0Sstevel@tonic-gate goto nextmsg; 529*0Sstevel@tonic-gate } 530*0Sstevel@tonic-gate } 531*0Sstevel@tonic-gate 532*0Sstevel@tonic-gate void 533*0Sstevel@tonic-gate sctp_free_msg(mblk_t *ump) 534*0Sstevel@tonic-gate { 535*0Sstevel@tonic-gate mblk_t *mp, *nmp; 536*0Sstevel@tonic-gate 537*0Sstevel@tonic-gate for (mp = ump->b_cont; mp; mp = nmp) { 538*0Sstevel@tonic-gate nmp = mp->b_next; 539*0Sstevel@tonic-gate mp->b_next = mp->b_prev = NULL; 540*0Sstevel@tonic-gate freemsg(mp); 541*0Sstevel@tonic-gate } 542*0Sstevel@tonic-gate ASSERT(!ump->b_prev); 543*0Sstevel@tonic-gate ump->b_next = NULL; 544*0Sstevel@tonic-gate freeb(ump); 545*0Sstevel@tonic-gate } 546*0Sstevel@tonic-gate 547*0Sstevel@tonic-gate mblk_t * 548*0Sstevel@tonic-gate sctp_add_proto_hdr(sctp_t *sctp, sctp_faddr_t *fp, mblk_t *mp, int sacklen) 549*0Sstevel@tonic-gate { 550*0Sstevel@tonic-gate int hdrlen; 551*0Sstevel@tonic-gate char *hdr; 552*0Sstevel@tonic-gate int isv4 = fp->isv4; 553*0Sstevel@tonic-gate 554*0Sstevel@tonic-gate if (isv4) { 555*0Sstevel@tonic-gate hdrlen = sctp->sctp_hdr_len; 556*0Sstevel@tonic-gate hdr = sctp->sctp_iphc; 557*0Sstevel@tonic-gate } else { 558*0Sstevel@tonic-gate hdrlen = sctp->sctp_hdr6_len; 559*0Sstevel@tonic-gate hdr = sctp->sctp_iphc6; 560*0Sstevel@tonic-gate } 561*0Sstevel@tonic-gate if (SCTP_IS_ADDR_UNSPEC(fp->isv4, fp->saddr)) { 562*0Sstevel@tonic-gate sctp_ire2faddr(sctp, fp); 563*0Sstevel@tonic-gate } else if (fp->ire == NULL) { 564*0Sstevel@tonic-gate ipaddr_t addr4; 565*0Sstevel@tonic-gate 566*0Sstevel@tonic-gate if (isv4) { 567*0Sstevel@tonic-gate IN6_V4MAPPED_TO_IPADDR(&fp->faddr, addr4); 568*0Sstevel@tonic-gate 569*0Sstevel@tonic-gate fp->ire = ire_cache_lookup(addr4, sctp->sctp_zoneid); 570*0Sstevel@tonic-gate } else { 571*0Sstevel@tonic-gate fp->ire = ire_cache_lookup_v6(&fp->faddr, 572*0Sstevel@tonic-gate sctp->sctp_zoneid); 573*0Sstevel@tonic-gate } 574*0Sstevel@tonic-gate if (fp->ire != NULL) { 575*0Sstevel@tonic-gate IRE_REFHOLD_NOTR(fp->ire); 576*0Sstevel@tonic-gate IRE_REFRELE(fp->ire); 577*0Sstevel@tonic-gate } 578*0Sstevel@tonic-gate if (fp->ire != NULL && fp->ire->ire_type == IRE_LOOPBACK && 579*0Sstevel@tonic-gate !sctp->sctp_loopback) { 580*0Sstevel@tonic-gate sctp->sctp_loopback = 1; 581*0Sstevel@tonic-gate } 582*0Sstevel@tonic-gate } 583*0Sstevel@tonic-gate 584*0Sstevel@tonic-gate /* Copy in IP header. */ 585*0Sstevel@tonic-gate if ((mp->b_rptr - mp->b_datap->db_base) < 586*0Sstevel@tonic-gate (sctp_wroff_xtra + hdrlen + sacklen) || DB_REF(mp) > 2) { 587*0Sstevel@tonic-gate mblk_t *nmp; 588*0Sstevel@tonic-gate /* 589*0Sstevel@tonic-gate * This can happen if IP headers are adjusted after 590*0Sstevel@tonic-gate * data was moved into chunks, or during retransmission, 591*0Sstevel@tonic-gate * or things like snoop is running. 592*0Sstevel@tonic-gate */ 593*0Sstevel@tonic-gate nmp = allocb(sctp_wroff_xtra + hdrlen + sacklen, BPRI_MED); 594*0Sstevel@tonic-gate if (nmp == NULL) { 595*0Sstevel@tonic-gate return (NULL); 596*0Sstevel@tonic-gate } 597*0Sstevel@tonic-gate nmp->b_rptr += sctp_wroff_xtra; 598*0Sstevel@tonic-gate nmp->b_wptr = nmp->b_rptr + hdrlen + sacklen; 599*0Sstevel@tonic-gate nmp->b_cont = mp; 600*0Sstevel@tonic-gate mp = nmp; 601*0Sstevel@tonic-gate } else { 602*0Sstevel@tonic-gate mp->b_rptr -= (hdrlen + sacklen); 603*0Sstevel@tonic-gate } 604*0Sstevel@tonic-gate bcopy(hdr, mp->b_rptr, hdrlen); 605*0Sstevel@tonic-gate if (sacklen) { 606*0Sstevel@tonic-gate sctp_fill_sack(sctp, mp->b_rptr + hdrlen, sacklen); 607*0Sstevel@tonic-gate } 608*0Sstevel@tonic-gate if (fp != sctp->sctp_current) { 609*0Sstevel@tonic-gate /* change addresses in header */ 610*0Sstevel@tonic-gate if (isv4) { 611*0Sstevel@tonic-gate ipha_t *iph = (ipha_t *)mp->b_rptr; 612*0Sstevel@tonic-gate 613*0Sstevel@tonic-gate IN6_V4MAPPED_TO_IPADDR(&fp->faddr, iph->ipha_dst); 614*0Sstevel@tonic-gate if (!IN6_IS_ADDR_V4MAPPED_ANY(&fp->saddr)) { 615*0Sstevel@tonic-gate IN6_V4MAPPED_TO_IPADDR(&fp->saddr, 616*0Sstevel@tonic-gate iph->ipha_src); 617*0Sstevel@tonic-gate } else if (sctp->sctp_bound_to_all) { 618*0Sstevel@tonic-gate iph->ipha_src = INADDR_ANY; 619*0Sstevel@tonic-gate } 620*0Sstevel@tonic-gate } else { 621*0Sstevel@tonic-gate ((ip6_t *)(mp->b_rptr))->ip6_dst = fp->faddr; 622*0Sstevel@tonic-gate if (!IN6_IS_ADDR_UNSPECIFIED(&fp->saddr)) { 623*0Sstevel@tonic-gate ((ip6_t *)(mp->b_rptr))->ip6_src = fp->saddr; 624*0Sstevel@tonic-gate } else if (sctp->sctp_bound_to_all) { 625*0Sstevel@tonic-gate V6_SET_ZERO(((ip6_t *)(mp->b_rptr))->ip6_src); 626*0Sstevel@tonic-gate } 627*0Sstevel@tonic-gate } 628*0Sstevel@tonic-gate } 629*0Sstevel@tonic-gate /* 630*0Sstevel@tonic-gate * IP will not free this IRE if it is condemned. SCTP needs to 631*0Sstevel@tonic-gate * free it. 632*0Sstevel@tonic-gate */ 633*0Sstevel@tonic-gate if ((fp->ire != NULL) && (fp->ire->ire_marks & IRE_MARK_CONDEMNED)) { 634*0Sstevel@tonic-gate IRE_REFRELE_NOTR(fp->ire); 635*0Sstevel@tonic-gate fp->ire = NULL; 636*0Sstevel@tonic-gate } 637*0Sstevel@tonic-gate 638*0Sstevel@tonic-gate /* Stash the conn and ire ptr info for IP */ 639*0Sstevel@tonic-gate SCTP_STASH_IPINFO(mp, fp->ire); 640*0Sstevel@tonic-gate 641*0Sstevel@tonic-gate return (mp); 642*0Sstevel@tonic-gate } 643*0Sstevel@tonic-gate 644*0Sstevel@tonic-gate /* 645*0Sstevel@tonic-gate * SCTP requires every chunk to be padded so that the total length 646*0Sstevel@tonic-gate * is a multiple of SCTP_ALIGN. This function returns a mblk with 647*0Sstevel@tonic-gate * the specified pad length. 648*0Sstevel@tonic-gate */ 649*0Sstevel@tonic-gate static mblk_t * 650*0Sstevel@tonic-gate sctp_get_padding(int pad) 651*0Sstevel@tonic-gate { 652*0Sstevel@tonic-gate mblk_t *fill; 653*0Sstevel@tonic-gate 654*0Sstevel@tonic-gate ASSERT(pad < SCTP_ALIGN); 655*0Sstevel@tonic-gate if ((fill = dupb(sctp_pad_mp)) != NULL) { 656*0Sstevel@tonic-gate fill->b_wptr += pad; 657*0Sstevel@tonic-gate return (fill); 658*0Sstevel@tonic-gate } 659*0Sstevel@tonic-gate 660*0Sstevel@tonic-gate /* 661*0Sstevel@tonic-gate * The memory saving path of reusing the sctp_pad_mp 662*0Sstevel@tonic-gate * fails may be because it has been dupb() too 663*0Sstevel@tonic-gate * many times (DBLK_REFMAX). Use the memory consuming 664*0Sstevel@tonic-gate * path of allocating the pad mblk. 665*0Sstevel@tonic-gate */ 666*0Sstevel@tonic-gate if ((fill = allocb(SCTP_ALIGN, BPRI_MED)) != NULL) { 667*0Sstevel@tonic-gate /* Zero it out. SCTP_ALIGN is sizeof (int32_t) */ 668*0Sstevel@tonic-gate *(int32_t *)fill->b_rptr = 0; 669*0Sstevel@tonic-gate fill->b_wptr += pad; 670*0Sstevel@tonic-gate } 671*0Sstevel@tonic-gate return (fill); 672*0Sstevel@tonic-gate } 673*0Sstevel@tonic-gate 674*0Sstevel@tonic-gate static mblk_t * 675*0Sstevel@tonic-gate sctp_find_fast_rexmit_mblks(sctp_t *sctp, int *total, sctp_faddr_t **fp) 676*0Sstevel@tonic-gate { 677*0Sstevel@tonic-gate mblk_t *meta; 678*0Sstevel@tonic-gate mblk_t *start_mp = NULL; 679*0Sstevel@tonic-gate mblk_t *end_mp = NULL; 680*0Sstevel@tonic-gate mblk_t *mp, *nmp; 681*0Sstevel@tonic-gate mblk_t *fill; 682*0Sstevel@tonic-gate sctp_data_hdr_t *sdh; 683*0Sstevel@tonic-gate int msglen; 684*0Sstevel@tonic-gate int extra; 685*0Sstevel@tonic-gate sctp_msg_hdr_t *msg_hdr; 686*0Sstevel@tonic-gate 687*0Sstevel@tonic-gate for (meta = sctp->sctp_xmit_head; meta != NULL; meta = meta->b_next) { 688*0Sstevel@tonic-gate msg_hdr = (sctp_msg_hdr_t *)meta->b_rptr; 689*0Sstevel@tonic-gate if (SCTP_IS_MSG_ABANDONED(meta) || 690*0Sstevel@tonic-gate SCTP_MSG_TO_BE_ABANDONED(meta, msg_hdr, sctp)) { 691*0Sstevel@tonic-gate continue; 692*0Sstevel@tonic-gate } 693*0Sstevel@tonic-gate for (mp = meta->b_cont; mp != NULL; mp = mp->b_next) { 694*0Sstevel@tonic-gate if (SCTP_CHUNK_WANT_REXMIT(mp)) { 695*0Sstevel@tonic-gate /* 696*0Sstevel@tonic-gate * Use the same peer address to do fast 697*0Sstevel@tonic-gate * retransmission. 698*0Sstevel@tonic-gate */ 699*0Sstevel@tonic-gate if (*fp == NULL) { 700*0Sstevel@tonic-gate *fp = SCTP_CHUNK_DEST(mp); 701*0Sstevel@tonic-gate if ((*fp)->state != SCTP_FADDRS_ALIVE) 702*0Sstevel@tonic-gate *fp = sctp->sctp_current; 703*0Sstevel@tonic-gate } else if (*fp != SCTP_CHUNK_DEST(mp)) { 704*0Sstevel@tonic-gate continue; 705*0Sstevel@tonic-gate } 706*0Sstevel@tonic-gate 707*0Sstevel@tonic-gate sdh = (sctp_data_hdr_t *)mp->b_rptr; 708*0Sstevel@tonic-gate msglen = ntohs(sdh->sdh_len); 709*0Sstevel@tonic-gate if ((extra = msglen & (SCTP_ALIGN - 1)) != 0) { 710*0Sstevel@tonic-gate extra = SCTP_ALIGN - extra; 711*0Sstevel@tonic-gate } 712*0Sstevel@tonic-gate 713*0Sstevel@tonic-gate /* 714*0Sstevel@tonic-gate * We still return at least the first message 715*0Sstevel@tonic-gate * even if that message cannot fit in as 716*0Sstevel@tonic-gate * PMTU may have changed. 717*0Sstevel@tonic-gate */ 718*0Sstevel@tonic-gate if (*total + msglen + extra > 719*0Sstevel@tonic-gate (*fp)->sfa_pmss && start_mp != NULL) { 720*0Sstevel@tonic-gate return (start_mp); 721*0Sstevel@tonic-gate } 722*0Sstevel@tonic-gate if ((nmp = dupmsg(mp)) == NULL) 723*0Sstevel@tonic-gate return (start_mp); 724*0Sstevel@tonic-gate if (extra > 0) { 725*0Sstevel@tonic-gate fill = sctp_get_padding(extra); 726*0Sstevel@tonic-gate if (fill != NULL) { 727*0Sstevel@tonic-gate linkb(nmp, fill); 728*0Sstevel@tonic-gate } else { 729*0Sstevel@tonic-gate return (start_mp); 730*0Sstevel@tonic-gate } 731*0Sstevel@tonic-gate } 732*0Sstevel@tonic-gate SCTP_CHUNK_CLEAR_REXMIT(mp); 733*0Sstevel@tonic-gate if (start_mp == NULL) { 734*0Sstevel@tonic-gate start_mp = nmp; 735*0Sstevel@tonic-gate } else { 736*0Sstevel@tonic-gate linkb(end_mp, nmp); 737*0Sstevel@tonic-gate } 738*0Sstevel@tonic-gate end_mp = nmp; 739*0Sstevel@tonic-gate *total += msglen + extra; 740*0Sstevel@tonic-gate dprint(2, ("sctp_find_fast_rexmit_mblks: " 741*0Sstevel@tonic-gate "tsn %x\n", sdh->sdh_tsn)); 742*0Sstevel@tonic-gate } 743*0Sstevel@tonic-gate } 744*0Sstevel@tonic-gate } 745*0Sstevel@tonic-gate /* Clear the flag as there is no more message to be fast rexmitted. */ 746*0Sstevel@tonic-gate sctp->sctp_chk_fast_rexmit = B_FALSE; 747*0Sstevel@tonic-gate return (start_mp); 748*0Sstevel@tonic-gate } 749*0Sstevel@tonic-gate 750*0Sstevel@tonic-gate /* A debug function just to make sure that a mblk chain is not broken */ 751*0Sstevel@tonic-gate #ifdef DEBUG 752*0Sstevel@tonic-gate static boolean_t 753*0Sstevel@tonic-gate sctp_verify_chain(mblk_t *head, mblk_t *tail) 754*0Sstevel@tonic-gate { 755*0Sstevel@tonic-gate mblk_t *mp = head; 756*0Sstevel@tonic-gate 757*0Sstevel@tonic-gate if (head == NULL || tail == NULL) 758*0Sstevel@tonic-gate return (B_TRUE); 759*0Sstevel@tonic-gate while (mp != NULL) { 760*0Sstevel@tonic-gate if (mp == tail) 761*0Sstevel@tonic-gate return (B_TRUE); 762*0Sstevel@tonic-gate mp = mp->b_next; 763*0Sstevel@tonic-gate } 764*0Sstevel@tonic-gate return (B_FALSE); 765*0Sstevel@tonic-gate } 766*0Sstevel@tonic-gate #endif 767*0Sstevel@tonic-gate 768*0Sstevel@tonic-gate /* 769*0Sstevel@tonic-gate * Gets the next unsent chunk to transmit. Messages that are abandoned are 770*0Sstevel@tonic-gate * skipped. A message can be abandoned if it has a non-zero timetolive and 771*0Sstevel@tonic-gate * transmission has not yet started or if it is a partially reliable 772*0Sstevel@tonic-gate * message and its time is up (assuming we are PR-SCTP aware). 773*0Sstevel@tonic-gate * 'cansend' is used to determine if need to try and chunkify messages from 774*0Sstevel@tonic-gate * the unsent list, if any, and also as an input to sctp_chunkify() if so. 775*0Sstevel@tonic-gate * When called from sctp_rexmit(), we don't want to chunkify, so 'cansend' 776*0Sstevel@tonic-gate * will be set to 0. 777*0Sstevel@tonic-gate */ 778*0Sstevel@tonic-gate mblk_t * 779*0Sstevel@tonic-gate sctp_get_msg_to_send(sctp_t *sctp, mblk_t **mp, mblk_t *meta, int *error, 780*0Sstevel@tonic-gate int32_t firstseg, uint32_t cansend, sctp_faddr_t *fp) 781*0Sstevel@tonic-gate { 782*0Sstevel@tonic-gate mblk_t *mp1; 783*0Sstevel@tonic-gate sctp_msg_hdr_t *msg_hdr; 784*0Sstevel@tonic-gate mblk_t *tmp_meta; 785*0Sstevel@tonic-gate sctp_faddr_t *fp1; 786*0Sstevel@tonic-gate 787*0Sstevel@tonic-gate ASSERT(error != NULL && mp != NULL); 788*0Sstevel@tonic-gate *error = 0; 789*0Sstevel@tonic-gate 790*0Sstevel@tonic-gate ASSERT(sctp->sctp_current != NULL); 791*0Sstevel@tonic-gate 792*0Sstevel@tonic-gate chunkified: 793*0Sstevel@tonic-gate while (meta != NULL) { 794*0Sstevel@tonic-gate tmp_meta = meta->b_next; 795*0Sstevel@tonic-gate msg_hdr = (sctp_msg_hdr_t *)meta->b_rptr; 796*0Sstevel@tonic-gate mp1 = meta->b_cont; 797*0Sstevel@tonic-gate if (SCTP_IS_MSG_ABANDONED(meta)) 798*0Sstevel@tonic-gate goto next_msg; 799*0Sstevel@tonic-gate if (!SCTP_MSG_TO_BE_ABANDONED(meta, msg_hdr, sctp)) { 800*0Sstevel@tonic-gate while (mp1 != NULL) { 801*0Sstevel@tonic-gate if (SCTP_CHUNK_CANSEND(mp1)) { 802*0Sstevel@tonic-gate *mp = mp1; 803*0Sstevel@tonic-gate #ifdef DEBUG 804*0Sstevel@tonic-gate ASSERT(sctp_verify_chain( 805*0Sstevel@tonic-gate sctp->sctp_xmit_head, meta)); 806*0Sstevel@tonic-gate #endif 807*0Sstevel@tonic-gate return (meta); 808*0Sstevel@tonic-gate } 809*0Sstevel@tonic-gate mp1 = mp1->b_next; 810*0Sstevel@tonic-gate } 811*0Sstevel@tonic-gate goto next_msg; 812*0Sstevel@tonic-gate } 813*0Sstevel@tonic-gate /* 814*0Sstevel@tonic-gate * If we come here and the first chunk is sent, then we 815*0Sstevel@tonic-gate * we are PR-SCTP aware, in which case if the cumulative 816*0Sstevel@tonic-gate * TSN has moved upto or beyond the first chunk (which 817*0Sstevel@tonic-gate * means all the previous messages have been cumulative 818*0Sstevel@tonic-gate * SACK'd), then we send a Forward TSN with the last 819*0Sstevel@tonic-gate * chunk that was sent in this message. If we can't send 820*0Sstevel@tonic-gate * a Forward TSN because previous non-abandoned messages 821*0Sstevel@tonic-gate * have not been acked then we will defer the Forward TSN 822*0Sstevel@tonic-gate * to sctp_rexmit() or sctp_cumack(). 823*0Sstevel@tonic-gate */ 824*0Sstevel@tonic-gate if (SCTP_CHUNK_ISSENT(mp1)) { 825*0Sstevel@tonic-gate *error = sctp_check_abandoned_msg(sctp, meta); 826*0Sstevel@tonic-gate if (*error != 0) { 827*0Sstevel@tonic-gate #ifdef DEBUG 828*0Sstevel@tonic-gate ASSERT(sctp_verify_chain(sctp->sctp_xmit_head, 829*0Sstevel@tonic-gate sctp->sctp_xmit_tail)); 830*0Sstevel@tonic-gate #endif 831*0Sstevel@tonic-gate return (NULL); 832*0Sstevel@tonic-gate } 833*0Sstevel@tonic-gate goto next_msg; 834*0Sstevel@tonic-gate } 835*0Sstevel@tonic-gate BUMP_LOCAL(sctp->sctp_prsctpdrop); 836*0Sstevel@tonic-gate ASSERT(sctp->sctp_unsent >= msg_hdr->smh_msglen); 837*0Sstevel@tonic-gate if (meta->b_prev == NULL) { 838*0Sstevel@tonic-gate ASSERT(sctp->sctp_xmit_head == meta); 839*0Sstevel@tonic-gate sctp->sctp_xmit_head = tmp_meta; 840*0Sstevel@tonic-gate if (sctp->sctp_xmit_tail == meta) 841*0Sstevel@tonic-gate sctp->sctp_xmit_tail = tmp_meta; 842*0Sstevel@tonic-gate meta->b_next = NULL; 843*0Sstevel@tonic-gate if (tmp_meta != NULL) 844*0Sstevel@tonic-gate tmp_meta->b_prev = NULL; 845*0Sstevel@tonic-gate } else if (meta->b_next == NULL) { 846*0Sstevel@tonic-gate if (sctp->sctp_xmit_tail == meta) 847*0Sstevel@tonic-gate sctp->sctp_xmit_tail = meta->b_prev; 848*0Sstevel@tonic-gate meta->b_prev->b_next = NULL; 849*0Sstevel@tonic-gate meta->b_prev = NULL; 850*0Sstevel@tonic-gate } else { 851*0Sstevel@tonic-gate meta->b_prev->b_next = tmp_meta; 852*0Sstevel@tonic-gate tmp_meta->b_prev = meta->b_prev; 853*0Sstevel@tonic-gate if (sctp->sctp_xmit_tail == meta) 854*0Sstevel@tonic-gate sctp->sctp_xmit_tail = tmp_meta; 855*0Sstevel@tonic-gate meta->b_prev = NULL; 856*0Sstevel@tonic-gate meta->b_next = NULL; 857*0Sstevel@tonic-gate } 858*0Sstevel@tonic-gate sctp->sctp_unsent -= msg_hdr->smh_msglen; 859*0Sstevel@tonic-gate /* 860*0Sstevel@tonic-gate * Update ULP the amount of queued data, which is 861*0Sstevel@tonic-gate * sent-unack'ed + unsent. 862*0Sstevel@tonic-gate */ 863*0Sstevel@tonic-gate if (!SCTP_IS_DETACHED(sctp)) { 864*0Sstevel@tonic-gate sctp->sctp_ulp_xmitted(sctp->sctp_ulpd, 865*0Sstevel@tonic-gate sctp->sctp_unacked + sctp->sctp_unsent); 866*0Sstevel@tonic-gate } 867*0Sstevel@tonic-gate sctp_sendfail_event(sctp, meta, 0, B_TRUE); 868*0Sstevel@tonic-gate next_msg: 869*0Sstevel@tonic-gate meta = tmp_meta; 870*0Sstevel@tonic-gate } 871*0Sstevel@tonic-gate /* chunkify, if needed */ 872*0Sstevel@tonic-gate if (cansend > 0 && sctp->sctp_xmit_unsent != NULL) { 873*0Sstevel@tonic-gate ASSERT(sctp->sctp_unsent > 0); 874*0Sstevel@tonic-gate if (fp == NULL) { 875*0Sstevel@tonic-gate fp = SCTP_CHUNK_DEST(sctp->sctp_xmit_unsent); 876*0Sstevel@tonic-gate if (fp == NULL || fp->state != SCTP_FADDRS_ALIVE) 877*0Sstevel@tonic-gate fp = sctp->sctp_current; 878*0Sstevel@tonic-gate } else { 879*0Sstevel@tonic-gate /* 880*0Sstevel@tonic-gate * If user specified destination, try to honor that. 881*0Sstevel@tonic-gate */ 882*0Sstevel@tonic-gate fp1 = SCTP_CHUNK_DEST(sctp->sctp_xmit_unsent); 883*0Sstevel@tonic-gate if (fp1 != NULL && fp1->state == SCTP_FADDRS_ALIVE && 884*0Sstevel@tonic-gate fp1 != fp) { 885*0Sstevel@tonic-gate goto chunk_done; 886*0Sstevel@tonic-gate } 887*0Sstevel@tonic-gate } 888*0Sstevel@tonic-gate sctp_chunkify(sctp, fp->sfa_pmss - firstseg, cansend); 889*0Sstevel@tonic-gate if ((meta = sctp->sctp_xmit_tail) == NULL) 890*0Sstevel@tonic-gate goto chunk_done; 891*0Sstevel@tonic-gate /* 892*0Sstevel@tonic-gate * sctp_chunkify() won't advance sctp_xmit_tail if it adds 893*0Sstevel@tonic-gate * new chunk(s) to the tail, so we need to skip the 894*0Sstevel@tonic-gate * sctp_xmit_tail, which would have already been processed. 895*0Sstevel@tonic-gate * This could happen when there is unacked chunks, but 896*0Sstevel@tonic-gate * nothing new to send. 897*0Sstevel@tonic-gate * When sctp_chunkify() is called when the transmit queue 898*0Sstevel@tonic-gate * is empty then we need to start from sctp_xmit_tail. 899*0Sstevel@tonic-gate */ 900*0Sstevel@tonic-gate if (SCTP_CHUNK_ISSENT(sctp->sctp_xmit_tail->b_cont)) { 901*0Sstevel@tonic-gate #ifdef DEBUG 902*0Sstevel@tonic-gate mp1 = sctp->sctp_xmit_tail->b_cont; 903*0Sstevel@tonic-gate while (mp1 != NULL) { 904*0Sstevel@tonic-gate ASSERT(!SCTP_CHUNK_CANSEND(mp1)); 905*0Sstevel@tonic-gate mp1 = mp1->b_next; 906*0Sstevel@tonic-gate } 907*0Sstevel@tonic-gate #endif 908*0Sstevel@tonic-gate if ((meta = sctp->sctp_xmit_tail->b_next) == NULL) 909*0Sstevel@tonic-gate goto chunk_done; 910*0Sstevel@tonic-gate } 911*0Sstevel@tonic-gate goto chunkified; 912*0Sstevel@tonic-gate } 913*0Sstevel@tonic-gate chunk_done: 914*0Sstevel@tonic-gate #ifdef DEBUG 915*0Sstevel@tonic-gate ASSERT(sctp_verify_chain(sctp->sctp_xmit_head, sctp->sctp_xmit_tail)); 916*0Sstevel@tonic-gate #endif 917*0Sstevel@tonic-gate return (NULL); 918*0Sstevel@tonic-gate } 919*0Sstevel@tonic-gate 920*0Sstevel@tonic-gate void 921*0Sstevel@tonic-gate sctp_fast_rexmit(sctp_t *sctp) 922*0Sstevel@tonic-gate { 923*0Sstevel@tonic-gate mblk_t *mp, *head; 924*0Sstevel@tonic-gate int pktlen = 0; 925*0Sstevel@tonic-gate sctp_faddr_t *fp = NULL; 926*0Sstevel@tonic-gate 927*0Sstevel@tonic-gate ASSERT(sctp->sctp_xmit_head != NULL); 928*0Sstevel@tonic-gate mp = sctp_find_fast_rexmit_mblks(sctp, &pktlen, &fp); 929*0Sstevel@tonic-gate if (mp == NULL) 930*0Sstevel@tonic-gate return; 931*0Sstevel@tonic-gate if ((head = sctp_add_proto_hdr(sctp, fp, mp, 0)) == NULL) { 932*0Sstevel@tonic-gate freemsg(mp); 933*0Sstevel@tonic-gate return; 934*0Sstevel@tonic-gate } 935*0Sstevel@tonic-gate if ((pktlen > fp->sfa_pmss) && fp->isv4) { 936*0Sstevel@tonic-gate ipha_t *iph = (ipha_t *)head->b_rptr; 937*0Sstevel@tonic-gate 938*0Sstevel@tonic-gate iph->ipha_fragment_offset_and_flags = 0; 939*0Sstevel@tonic-gate } 940*0Sstevel@tonic-gate 941*0Sstevel@tonic-gate sctp_set_iplen(sctp, head); 942*0Sstevel@tonic-gate sctp_add_sendq(sctp, head); 943*0Sstevel@tonic-gate sctp->sctp_active = fp->lastactive = lbolt64; 944*0Sstevel@tonic-gate } 945*0Sstevel@tonic-gate 946*0Sstevel@tonic-gate void 947*0Sstevel@tonic-gate sctp_output(sctp_t *sctp) 948*0Sstevel@tonic-gate { 949*0Sstevel@tonic-gate mblk_t *mp = NULL; 950*0Sstevel@tonic-gate mblk_t *nmp; 951*0Sstevel@tonic-gate mblk_t *head; 952*0Sstevel@tonic-gate mblk_t *meta = sctp->sctp_xmit_tail; 953*0Sstevel@tonic-gate mblk_t *fill = NULL; 954*0Sstevel@tonic-gate uint16_t chunklen; 955*0Sstevel@tonic-gate uint32_t cansend; 956*0Sstevel@tonic-gate int32_t seglen; 957*0Sstevel@tonic-gate int32_t xtralen; 958*0Sstevel@tonic-gate int32_t sacklen; 959*0Sstevel@tonic-gate int32_t pad = 0; 960*0Sstevel@tonic-gate int32_t pathmax; 961*0Sstevel@tonic-gate int extra; 962*0Sstevel@tonic-gate int64_t now = lbolt64; 963*0Sstevel@tonic-gate sctp_faddr_t *fp; 964*0Sstevel@tonic-gate sctp_faddr_t *lfp; 965*0Sstevel@tonic-gate sctp_data_hdr_t *sdc; 966*0Sstevel@tonic-gate int error; 967*0Sstevel@tonic-gate 968*0Sstevel@tonic-gate if (sctp->sctp_ftsn == sctp->sctp_lastacked + 1) { 969*0Sstevel@tonic-gate sacklen = 0; 970*0Sstevel@tonic-gate } else { 971*0Sstevel@tonic-gate /* send a SACK chunk */ 972*0Sstevel@tonic-gate sacklen = sizeof (sctp_chunk_hdr_t) + 973*0Sstevel@tonic-gate sizeof (sctp_sack_chunk_t) + 974*0Sstevel@tonic-gate (sizeof (sctp_sack_frag_t) * sctp->sctp_sack_gaps); 975*0Sstevel@tonic-gate lfp = sctp->sctp_lastdata; 976*0Sstevel@tonic-gate ASSERT(lfp != NULL); 977*0Sstevel@tonic-gate if (lfp->state != SCTP_FADDRS_ALIVE) 978*0Sstevel@tonic-gate lfp = sctp->sctp_current; 979*0Sstevel@tonic-gate } 980*0Sstevel@tonic-gate 981*0Sstevel@tonic-gate cansend = sctp->sctp_frwnd; 982*0Sstevel@tonic-gate if (sctp->sctp_unsent < cansend) 983*0Sstevel@tonic-gate cansend = sctp->sctp_unsent; 984*0Sstevel@tonic-gate if ((cansend < sctp->sctp_current->sfa_pmss / 2) && 985*0Sstevel@tonic-gate sctp->sctp_unacked && 986*0Sstevel@tonic-gate (sctp->sctp_unacked < sctp->sctp_current->sfa_pmss) && 987*0Sstevel@tonic-gate !sctp->sctp_ndelay) { 988*0Sstevel@tonic-gate head = NULL; 989*0Sstevel@tonic-gate fp = sctp->sctp_current; 990*0Sstevel@tonic-gate goto unsent_data; 991*0Sstevel@tonic-gate } 992*0Sstevel@tonic-gate if (meta != NULL) 993*0Sstevel@tonic-gate mp = meta->b_cont; 994*0Sstevel@tonic-gate while (cansend > 0) { 995*0Sstevel@tonic-gate pad = 0; 996*0Sstevel@tonic-gate 997*0Sstevel@tonic-gate /* 998*0Sstevel@tonic-gate * Find first segment eligible for transmit. 999*0Sstevel@tonic-gate */ 1000*0Sstevel@tonic-gate while (mp != NULL) { 1001*0Sstevel@tonic-gate if (SCTP_CHUNK_CANSEND(mp)) 1002*0Sstevel@tonic-gate break; 1003*0Sstevel@tonic-gate mp = mp->b_next; 1004*0Sstevel@tonic-gate } 1005*0Sstevel@tonic-gate if (mp == NULL) { 1006*0Sstevel@tonic-gate meta = sctp_get_msg_to_send(sctp, &mp, 1007*0Sstevel@tonic-gate meta == NULL ? NULL : meta->b_next, &error, sacklen, 1008*0Sstevel@tonic-gate cansend, NULL); 1009*0Sstevel@tonic-gate if (error != 0 || meta == NULL) { 1010*0Sstevel@tonic-gate head = NULL; 1011*0Sstevel@tonic-gate fp = sctp->sctp_current; 1012*0Sstevel@tonic-gate goto unsent_data; 1013*0Sstevel@tonic-gate } 1014*0Sstevel@tonic-gate sctp->sctp_xmit_tail = meta; 1015*0Sstevel@tonic-gate } 1016*0Sstevel@tonic-gate 1017*0Sstevel@tonic-gate sdc = (sctp_data_hdr_t *)mp->b_rptr; 1018*0Sstevel@tonic-gate seglen = ntohs(sdc->sdh_len); 1019*0Sstevel@tonic-gate xtralen = sizeof (*sdc); 1020*0Sstevel@tonic-gate chunklen = seglen - xtralen; 1021*0Sstevel@tonic-gate 1022*0Sstevel@tonic-gate /* 1023*0Sstevel@tonic-gate * Check rwnd. 1024*0Sstevel@tonic-gate */ 1025*0Sstevel@tonic-gate if (chunklen > cansend) { 1026*0Sstevel@tonic-gate head = NULL; 1027*0Sstevel@tonic-gate fp = SCTP_CHUNK_DEST(meta); 1028*0Sstevel@tonic-gate if (fp == NULL || fp->state != SCTP_FADDRS_ALIVE) 1029*0Sstevel@tonic-gate fp = sctp->sctp_current; 1030*0Sstevel@tonic-gate goto unsent_data; 1031*0Sstevel@tonic-gate } 1032*0Sstevel@tonic-gate if ((extra = seglen & (SCTP_ALIGN - 1)) != 0) 1033*0Sstevel@tonic-gate extra = SCTP_ALIGN - extra; 1034*0Sstevel@tonic-gate 1035*0Sstevel@tonic-gate /* 1036*0Sstevel@tonic-gate * Pick destination address, and check cwnd. 1037*0Sstevel@tonic-gate */ 1038*0Sstevel@tonic-gate if (sacklen > 0 && (seglen + extra <= lfp->cwnd - lfp->suna) && 1039*0Sstevel@tonic-gate (seglen + sacklen + extra <= lfp->sfa_pmss)) { 1040*0Sstevel@tonic-gate /* 1041*0Sstevel@tonic-gate * Only include SACK chunk if it can be bundled 1042*0Sstevel@tonic-gate * with a data chunk, and sent to sctp_lastdata. 1043*0Sstevel@tonic-gate */ 1044*0Sstevel@tonic-gate pathmax = lfp->cwnd - lfp->suna; 1045*0Sstevel@tonic-gate 1046*0Sstevel@tonic-gate fp = lfp; 1047*0Sstevel@tonic-gate if ((nmp = dupmsg(mp)) == NULL) { 1048*0Sstevel@tonic-gate head = NULL; 1049*0Sstevel@tonic-gate goto unsent_data; 1050*0Sstevel@tonic-gate } 1051*0Sstevel@tonic-gate SCTP_CHUNK_CLEAR_FLAGS(nmp); 1052*0Sstevel@tonic-gate head = sctp_add_proto_hdr(sctp, fp, nmp, sacklen); 1053*0Sstevel@tonic-gate if (head == NULL) { 1054*0Sstevel@tonic-gate freemsg(nmp); 1055*0Sstevel@tonic-gate goto unsent_data; 1056*0Sstevel@tonic-gate } 1057*0Sstevel@tonic-gate seglen += sacklen; 1058*0Sstevel@tonic-gate xtralen += sacklen; 1059*0Sstevel@tonic-gate sacklen = 0; 1060*0Sstevel@tonic-gate } else { 1061*0Sstevel@tonic-gate fp = SCTP_CHUNK_DEST(meta); 1062*0Sstevel@tonic-gate if (fp == NULL || fp->state != SCTP_FADDRS_ALIVE) 1063*0Sstevel@tonic-gate fp = sctp->sctp_current; 1064*0Sstevel@tonic-gate /* 1065*0Sstevel@tonic-gate * If we haven't sent data to this destination for 1066*0Sstevel@tonic-gate * a while, do slow start again. 1067*0Sstevel@tonic-gate */ 1068*0Sstevel@tonic-gate if (now - fp->lastactive > fp->rto) { 1069*0Sstevel@tonic-gate fp->cwnd = sctp_slow_start_after_idle * 1070*0Sstevel@tonic-gate fp->sfa_pmss; 1071*0Sstevel@tonic-gate } 1072*0Sstevel@tonic-gate fp->lastactive = now; 1073*0Sstevel@tonic-gate 1074*0Sstevel@tonic-gate pathmax = fp->cwnd - fp->suna; 1075*0Sstevel@tonic-gate if (seglen + extra > pathmax) { 1076*0Sstevel@tonic-gate head = NULL; 1077*0Sstevel@tonic-gate goto unsent_data; 1078*0Sstevel@tonic-gate } 1079*0Sstevel@tonic-gate if ((nmp = dupmsg(mp)) == NULL) { 1080*0Sstevel@tonic-gate head = NULL; 1081*0Sstevel@tonic-gate goto unsent_data; 1082*0Sstevel@tonic-gate } 1083*0Sstevel@tonic-gate SCTP_CHUNK_CLEAR_FLAGS(nmp); 1084*0Sstevel@tonic-gate head = sctp_add_proto_hdr(sctp, fp, nmp, 0); 1085*0Sstevel@tonic-gate if (head == NULL) { 1086*0Sstevel@tonic-gate freemsg(nmp); 1087*0Sstevel@tonic-gate goto unsent_data; 1088*0Sstevel@tonic-gate } 1089*0Sstevel@tonic-gate } 1090*0Sstevel@tonic-gate if (pathmax > fp->sfa_pmss) 1091*0Sstevel@tonic-gate pathmax = fp->sfa_pmss; 1092*0Sstevel@tonic-gate SCTP_CHUNK_SENT(sctp, mp, sdc, fp, chunklen, meta); 1093*0Sstevel@tonic-gate mp = mp->b_next; 1094*0Sstevel@tonic-gate 1095*0Sstevel@tonic-gate /* Use this chunk to measure RTT? */ 1096*0Sstevel@tonic-gate if (sctp->sctp_out_time == 0) { 1097*0Sstevel@tonic-gate sctp->sctp_out_time = now; 1098*0Sstevel@tonic-gate sctp->sctp_rtt_tsn = sctp->sctp_ltsn - 1; 1099*0Sstevel@tonic-gate } 1100*0Sstevel@tonic-gate if (extra > 0) { 1101*0Sstevel@tonic-gate fill = sctp_get_padding(extra); 1102*0Sstevel@tonic-gate if (fill != NULL) { 1103*0Sstevel@tonic-gate linkb(head, fill); 1104*0Sstevel@tonic-gate pad = extra; 1105*0Sstevel@tonic-gate seglen += extra; 1106*0Sstevel@tonic-gate } else { 1107*0Sstevel@tonic-gate goto unsent_data; 1108*0Sstevel@tonic-gate } 1109*0Sstevel@tonic-gate } 1110*0Sstevel@tonic-gate /* See if we can bundle more. */ 1111*0Sstevel@tonic-gate while (seglen < pathmax) { 1112*0Sstevel@tonic-gate int32_t new_len; 1113*0Sstevel@tonic-gate int32_t new_xtralen; 1114*0Sstevel@tonic-gate 1115*0Sstevel@tonic-gate while (mp != NULL) { 1116*0Sstevel@tonic-gate if (SCTP_CHUNK_CANSEND(mp)) 1117*0Sstevel@tonic-gate break; 1118*0Sstevel@tonic-gate mp = mp->b_next; 1119*0Sstevel@tonic-gate } 1120*0Sstevel@tonic-gate if (mp == NULL) { 1121*0Sstevel@tonic-gate meta = sctp_get_msg_to_send(sctp, &mp, 1122*0Sstevel@tonic-gate meta->b_next, &error, seglen, 1123*0Sstevel@tonic-gate (seglen - xtralen) >= cansend ? 0 : 1124*0Sstevel@tonic-gate cansend - seglen, fp); 1125*0Sstevel@tonic-gate if (error != 0 || meta == NULL) 1126*0Sstevel@tonic-gate break; 1127*0Sstevel@tonic-gate sctp->sctp_xmit_tail = meta; 1128*0Sstevel@tonic-gate } 1129*0Sstevel@tonic-gate ASSERT(mp != NULL); 1130*0Sstevel@tonic-gate if (!SCTP_CHUNK_ISSENT(mp) && SCTP_CHUNK_DEST(meta) && 1131*0Sstevel@tonic-gate fp != SCTP_CHUNK_DEST(meta)) { 1132*0Sstevel@tonic-gate break; 1133*0Sstevel@tonic-gate } 1134*0Sstevel@tonic-gate sdc = (sctp_data_hdr_t *)mp->b_rptr; 1135*0Sstevel@tonic-gate chunklen = ntohs(sdc->sdh_len); 1136*0Sstevel@tonic-gate if ((extra = chunklen & (SCTP_ALIGN - 1)) != 0) 1137*0Sstevel@tonic-gate extra = SCTP_ALIGN - extra; 1138*0Sstevel@tonic-gate 1139*0Sstevel@tonic-gate new_len = seglen + chunklen; 1140*0Sstevel@tonic-gate new_xtralen = xtralen + sizeof (*sdc); 1141*0Sstevel@tonic-gate chunklen -= sizeof (*sdc); 1142*0Sstevel@tonic-gate 1143*0Sstevel@tonic-gate if (new_len - new_xtralen > cansend || 1144*0Sstevel@tonic-gate new_len + extra > pathmax) { 1145*0Sstevel@tonic-gate break; 1146*0Sstevel@tonic-gate } 1147*0Sstevel@tonic-gate if ((nmp = dupmsg(mp)) == NULL) 1148*0Sstevel@tonic-gate break; 1149*0Sstevel@tonic-gate if (extra > 0) { 1150*0Sstevel@tonic-gate fill = sctp_get_padding(extra); 1151*0Sstevel@tonic-gate if (fill != NULL) { 1152*0Sstevel@tonic-gate pad += extra; 1153*0Sstevel@tonic-gate new_len += extra; 1154*0Sstevel@tonic-gate linkb(nmp, fill); 1155*0Sstevel@tonic-gate } else { 1156*0Sstevel@tonic-gate freemsg(nmp); 1157*0Sstevel@tonic-gate break; 1158*0Sstevel@tonic-gate } 1159*0Sstevel@tonic-gate } 1160*0Sstevel@tonic-gate seglen = new_len; 1161*0Sstevel@tonic-gate xtralen = new_xtralen; 1162*0Sstevel@tonic-gate SCTP_CHUNK_CLEAR_FLAGS(nmp); 1163*0Sstevel@tonic-gate SCTP_CHUNK_SENT(sctp, mp, sdc, fp, chunklen, meta); 1164*0Sstevel@tonic-gate linkb(head, nmp); 1165*0Sstevel@tonic-gate mp = mp->b_next; 1166*0Sstevel@tonic-gate } 1167*0Sstevel@tonic-gate if ((seglen > fp->sfa_pmss) && fp->isv4) { 1168*0Sstevel@tonic-gate ipha_t *iph = (ipha_t *)head->b_rptr; 1169*0Sstevel@tonic-gate 1170*0Sstevel@tonic-gate /* 1171*0Sstevel@tonic-gate * Path MTU is different from what we thought it would 1172*0Sstevel@tonic-gate * be when we created chunks, or IP headers have grown. 1173*0Sstevel@tonic-gate * Need to clear the DF bit. 1174*0Sstevel@tonic-gate */ 1175*0Sstevel@tonic-gate iph->ipha_fragment_offset_and_flags = 0; 1176*0Sstevel@tonic-gate } 1177*0Sstevel@tonic-gate /* xmit segment */ 1178*0Sstevel@tonic-gate ASSERT(cansend >= seglen - pad - xtralen); 1179*0Sstevel@tonic-gate cansend -= (seglen - pad - xtralen); 1180*0Sstevel@tonic-gate dprint(2, ("sctp_output: Sending packet %d bytes, tsn %x " 1181*0Sstevel@tonic-gate "ssn %d to %p (rwnd %d, cansend %d, lastack_rxd %x)\n", 1182*0Sstevel@tonic-gate seglen - xtralen, ntohl(sdc->sdh_tsn), 1183*0Sstevel@tonic-gate ntohs(sdc->sdh_ssn), fp, sctp->sctp_frwnd, cansend, 1184*0Sstevel@tonic-gate sctp->sctp_lastack_rxd)); 1185*0Sstevel@tonic-gate sctp_set_iplen(sctp, head); 1186*0Sstevel@tonic-gate sctp_add_sendq(sctp, head); 1187*0Sstevel@tonic-gate /* arm rto timer (if not set) */ 1188*0Sstevel@tonic-gate if (!fp->timer_running) 1189*0Sstevel@tonic-gate SCTP_FADDR_TIMER_RESTART(sctp, fp, fp->rto); 1190*0Sstevel@tonic-gate } 1191*0Sstevel@tonic-gate sctp->sctp_active = now; 1192*0Sstevel@tonic-gate return; 1193*0Sstevel@tonic-gate unsent_data: 1194*0Sstevel@tonic-gate /* arm persist timer (if rto timer not set) */ 1195*0Sstevel@tonic-gate if (!fp->timer_running) 1196*0Sstevel@tonic-gate SCTP_FADDR_TIMER_RESTART(sctp, fp, fp->rto); 1197*0Sstevel@tonic-gate if (head != NULL) 1198*0Sstevel@tonic-gate freemsg(head); 1199*0Sstevel@tonic-gate } 1200*0Sstevel@tonic-gate 1201*0Sstevel@tonic-gate /* 1202*0Sstevel@tonic-gate * The following two functions initialize and destroy the cache 1203*0Sstevel@tonic-gate * associated with the sets used for PR-SCTP. 1204*0Sstevel@tonic-gate */ 1205*0Sstevel@tonic-gate void 1206*0Sstevel@tonic-gate sctp_ftsn_sets_init(void) 1207*0Sstevel@tonic-gate { 1208*0Sstevel@tonic-gate sctp_kmem_ftsn_set_cache = kmem_cache_create("sctp_ftsn_set_cache", 1209*0Sstevel@tonic-gate sizeof (sctp_ftsn_set_t), 0, NULL, NULL, NULL, NULL, 1210*0Sstevel@tonic-gate NULL, 0); 1211*0Sstevel@tonic-gate } 1212*0Sstevel@tonic-gate 1213*0Sstevel@tonic-gate void 1214*0Sstevel@tonic-gate sctp_ftsn_sets_fini(void) 1215*0Sstevel@tonic-gate { 1216*0Sstevel@tonic-gate kmem_cache_destroy(sctp_kmem_ftsn_set_cache); 1217*0Sstevel@tonic-gate } 1218*0Sstevel@tonic-gate 1219*0Sstevel@tonic-gate 1220*0Sstevel@tonic-gate /* Free PR-SCTP sets */ 1221*0Sstevel@tonic-gate void 1222*0Sstevel@tonic-gate sctp_free_ftsn_set(sctp_ftsn_set_t *s) 1223*0Sstevel@tonic-gate { 1224*0Sstevel@tonic-gate sctp_ftsn_set_t *p; 1225*0Sstevel@tonic-gate 1226*0Sstevel@tonic-gate while (s != NULL) { 1227*0Sstevel@tonic-gate p = s->next; 1228*0Sstevel@tonic-gate s->next = NULL; 1229*0Sstevel@tonic-gate kmem_cache_free(sctp_kmem_ftsn_set_cache, s); 1230*0Sstevel@tonic-gate s = p; 1231*0Sstevel@tonic-gate } 1232*0Sstevel@tonic-gate } 1233*0Sstevel@tonic-gate 1234*0Sstevel@tonic-gate /* 1235*0Sstevel@tonic-gate * Given a message meta block, meta, this routine creates or modifies 1236*0Sstevel@tonic-gate * the set that will be used to generate a Forward TSN chunk. If the 1237*0Sstevel@tonic-gate * entry for stream id, sid, for this message already exists, the 1238*0Sstevel@tonic-gate * sequence number, ssn, is updated if it is greater than the existing 1239*0Sstevel@tonic-gate * one. If an entry for this sid does not exist, one is created if 1240*0Sstevel@tonic-gate * the size does not exceed fp->sfa_pmss. We return false in case 1241*0Sstevel@tonic-gate * or an error. 1242*0Sstevel@tonic-gate */ 1243*0Sstevel@tonic-gate boolean_t 1244*0Sstevel@tonic-gate sctp_add_ftsn_set(sctp_ftsn_set_t **s, sctp_faddr_t *fp, mblk_t *meta, 1245*0Sstevel@tonic-gate uint_t *nsets, uint32_t *slen) 1246*0Sstevel@tonic-gate { 1247*0Sstevel@tonic-gate sctp_ftsn_set_t *p; 1248*0Sstevel@tonic-gate sctp_msg_hdr_t *msg_hdr = (sctp_msg_hdr_t *)meta->b_rptr; 1249*0Sstevel@tonic-gate uint16_t sid = htons(msg_hdr->smh_sid); 1250*0Sstevel@tonic-gate /* msg_hdr->smh_ssn is already in NBO */ 1251*0Sstevel@tonic-gate uint16_t ssn = msg_hdr->smh_ssn; 1252*0Sstevel@tonic-gate 1253*0Sstevel@tonic-gate ASSERT(s != NULL && nsets != NULL); 1254*0Sstevel@tonic-gate ASSERT((*nsets == 0 && *s == NULL) || (*nsets > 0 && *s != NULL)); 1255*0Sstevel@tonic-gate 1256*0Sstevel@tonic-gate if (*s == NULL) { 1257*0Sstevel@tonic-gate ASSERT((*slen + sizeof (uint32_t)) <= fp->sfa_pmss); 1258*0Sstevel@tonic-gate *s = kmem_cache_alloc(sctp_kmem_ftsn_set_cache, KM_NOSLEEP); 1259*0Sstevel@tonic-gate if (*s == NULL) 1260*0Sstevel@tonic-gate return (B_FALSE); 1261*0Sstevel@tonic-gate (*s)->ftsn_entries.ftsn_sid = sid; 1262*0Sstevel@tonic-gate (*s)->ftsn_entries.ftsn_ssn = ssn; 1263*0Sstevel@tonic-gate (*s)->next = NULL; 1264*0Sstevel@tonic-gate *nsets = 1; 1265*0Sstevel@tonic-gate *slen += sizeof (uint32_t); 1266*0Sstevel@tonic-gate return (B_TRUE); 1267*0Sstevel@tonic-gate } 1268*0Sstevel@tonic-gate for (p = *s; p->next != NULL; p = p->next) { 1269*0Sstevel@tonic-gate if (p->ftsn_entries.ftsn_sid == sid) { 1270*0Sstevel@tonic-gate if (SSN_GT(ssn, p->ftsn_entries.ftsn_ssn)) 1271*0Sstevel@tonic-gate p->ftsn_entries.ftsn_ssn = ssn; 1272*0Sstevel@tonic-gate return (B_TRUE); 1273*0Sstevel@tonic-gate } 1274*0Sstevel@tonic-gate } 1275*0Sstevel@tonic-gate /* the last one */ 1276*0Sstevel@tonic-gate if (p->ftsn_entries.ftsn_sid == sid) { 1277*0Sstevel@tonic-gate if (SSN_GT(ssn, p->ftsn_entries.ftsn_ssn)) 1278*0Sstevel@tonic-gate p->ftsn_entries.ftsn_ssn = ssn; 1279*0Sstevel@tonic-gate } else { 1280*0Sstevel@tonic-gate if ((*slen + sizeof (uint32_t)) > fp->sfa_pmss) 1281*0Sstevel@tonic-gate return (B_FALSE); 1282*0Sstevel@tonic-gate p->next = kmem_cache_alloc(sctp_kmem_ftsn_set_cache, 1283*0Sstevel@tonic-gate KM_NOSLEEP); 1284*0Sstevel@tonic-gate if (p->next == NULL) 1285*0Sstevel@tonic-gate return (B_FALSE); 1286*0Sstevel@tonic-gate p = p->next; 1287*0Sstevel@tonic-gate p->ftsn_entries.ftsn_sid = sid; 1288*0Sstevel@tonic-gate p->ftsn_entries.ftsn_ssn = ssn; 1289*0Sstevel@tonic-gate p->next = NULL; 1290*0Sstevel@tonic-gate (*nsets)++; 1291*0Sstevel@tonic-gate *slen += sizeof (uint32_t); 1292*0Sstevel@tonic-gate } 1293*0Sstevel@tonic-gate return (B_TRUE); 1294*0Sstevel@tonic-gate } 1295*0Sstevel@tonic-gate 1296*0Sstevel@tonic-gate /* 1297*0Sstevel@tonic-gate * Given a set of stream id - sequence number pairs, this routing creates 1298*0Sstevel@tonic-gate * a Forward TSN chunk. The cumulative TSN (advanced peer ack point) 1299*0Sstevel@tonic-gate * for the chunk is obtained from sctp->sctp_adv_pap. The caller 1300*0Sstevel@tonic-gate * will add the IP/SCTP header. 1301*0Sstevel@tonic-gate */ 1302*0Sstevel@tonic-gate mblk_t * 1303*0Sstevel@tonic-gate sctp_make_ftsn_chunk(sctp_t *sctp, sctp_faddr_t *fp, sctp_ftsn_set_t *sets, 1304*0Sstevel@tonic-gate uint_t nsets, uint32_t seglen) 1305*0Sstevel@tonic-gate { 1306*0Sstevel@tonic-gate mblk_t *ftsn_mp; 1307*0Sstevel@tonic-gate sctp_chunk_hdr_t *ch_hdr; 1308*0Sstevel@tonic-gate uint32_t *advtsn; 1309*0Sstevel@tonic-gate uint16_t schlen; 1310*0Sstevel@tonic-gate size_t xtralen; 1311*0Sstevel@tonic-gate ftsn_entry_t *ftsn_entry; 1312*0Sstevel@tonic-gate 1313*0Sstevel@tonic-gate seglen += sizeof (sctp_chunk_hdr_t); 1314*0Sstevel@tonic-gate if (fp->isv4) 1315*0Sstevel@tonic-gate xtralen = sctp->sctp_hdr_len + sctp_wroff_xtra; 1316*0Sstevel@tonic-gate else 1317*0Sstevel@tonic-gate xtralen = sctp->sctp_hdr6_len + sctp_wroff_xtra; 1318*0Sstevel@tonic-gate ftsn_mp = allocb(xtralen + seglen, BPRI_MED); 1319*0Sstevel@tonic-gate if (ftsn_mp == NULL) 1320*0Sstevel@tonic-gate return (NULL); 1321*0Sstevel@tonic-gate ftsn_mp->b_rptr += xtralen; 1322*0Sstevel@tonic-gate ftsn_mp->b_wptr = ftsn_mp->b_rptr + seglen; 1323*0Sstevel@tonic-gate 1324*0Sstevel@tonic-gate ch_hdr = (sctp_chunk_hdr_t *)ftsn_mp->b_rptr; 1325*0Sstevel@tonic-gate ch_hdr->sch_id = CHUNK_FORWARD_TSN; 1326*0Sstevel@tonic-gate ch_hdr->sch_flags = 0; 1327*0Sstevel@tonic-gate /* 1328*0Sstevel@tonic-gate * The cast here should not be an issue since seglen is 1329*0Sstevel@tonic-gate * the length of the Forward TSN chunk. 1330*0Sstevel@tonic-gate */ 1331*0Sstevel@tonic-gate schlen = (uint16_t)seglen; 1332*0Sstevel@tonic-gate U16_TO_ABE16(schlen, &(ch_hdr->sch_len)); 1333*0Sstevel@tonic-gate 1334*0Sstevel@tonic-gate advtsn = (uint32_t *)(ch_hdr + 1); 1335*0Sstevel@tonic-gate U32_TO_ABE32(sctp->sctp_adv_pap, advtsn); 1336*0Sstevel@tonic-gate ftsn_entry = (ftsn_entry_t *)(advtsn + 1); 1337*0Sstevel@tonic-gate while (nsets > 0) { 1338*0Sstevel@tonic-gate ASSERT((uchar_t *)&ftsn_entry[1] <= ftsn_mp->b_wptr); 1339*0Sstevel@tonic-gate ftsn_entry->ftsn_sid = sets->ftsn_entries.ftsn_sid; 1340*0Sstevel@tonic-gate ftsn_entry->ftsn_ssn = sets->ftsn_entries.ftsn_ssn; 1341*0Sstevel@tonic-gate ftsn_entry++; 1342*0Sstevel@tonic-gate sets = sets->next; 1343*0Sstevel@tonic-gate nsets--; 1344*0Sstevel@tonic-gate } 1345*0Sstevel@tonic-gate return (ftsn_mp); 1346*0Sstevel@tonic-gate } 1347*0Sstevel@tonic-gate 1348*0Sstevel@tonic-gate /* 1349*0Sstevel@tonic-gate * Given a starting message, the routine steps through all the 1350*0Sstevel@tonic-gate * messages whose TSN is less than sctp->sctp_adv_pap and creates 1351*0Sstevel@tonic-gate * ftsn sets. The ftsn sets is then used to create an Forward TSN 1352*0Sstevel@tonic-gate * chunk. All the messages, that have chunks that are included in the 1353*0Sstevel@tonic-gate * ftsn sets, are flagged abandonded. If a message is partially sent 1354*0Sstevel@tonic-gate * and is deemed abandoned, all remaining unsent chunks are marked 1355*0Sstevel@tonic-gate * abandoned and are deducted from sctp_unsent. 1356*0Sstevel@tonic-gate */ 1357*0Sstevel@tonic-gate void 1358*0Sstevel@tonic-gate sctp_make_ftsns(sctp_t *sctp, mblk_t *meta, mblk_t *mp, mblk_t **nmp, 1359*0Sstevel@tonic-gate sctp_faddr_t *fp, uint32_t *seglen) 1360*0Sstevel@tonic-gate { 1361*0Sstevel@tonic-gate mblk_t *mp1 = mp; 1362*0Sstevel@tonic-gate mblk_t *mp_head = mp; 1363*0Sstevel@tonic-gate mblk_t *meta_head = meta; 1364*0Sstevel@tonic-gate mblk_t *head; 1365*0Sstevel@tonic-gate sctp_ftsn_set_t *sets = NULL; 1366*0Sstevel@tonic-gate uint_t nsets = 0; 1367*0Sstevel@tonic-gate uint16_t clen; 1368*0Sstevel@tonic-gate sctp_data_hdr_t *sdc; 1369*0Sstevel@tonic-gate uint32_t sacklen; 1370*0Sstevel@tonic-gate uint32_t adv_pap = sctp->sctp_adv_pap; 1371*0Sstevel@tonic-gate uint32_t unsent = 0; 1372*0Sstevel@tonic-gate boolean_t ubit; 1373*0Sstevel@tonic-gate 1374*0Sstevel@tonic-gate *seglen = sizeof (uint32_t); 1375*0Sstevel@tonic-gate 1376*0Sstevel@tonic-gate sdc = (sctp_data_hdr_t *)mp1->b_rptr; 1377*0Sstevel@tonic-gate while (meta != NULL && 1378*0Sstevel@tonic-gate SEQ_GEQ(sctp->sctp_adv_pap, ntohl(sdc->sdh_tsn))) { 1379*0Sstevel@tonic-gate /* 1380*0Sstevel@tonic-gate * Skip adding FTSN sets for un-ordered messages as they do 1381*0Sstevel@tonic-gate * not have SSNs. 1382*0Sstevel@tonic-gate */ 1383*0Sstevel@tonic-gate ubit = SCTP_DATA_GET_UBIT(sdc); 1384*0Sstevel@tonic-gate if (!ubit && 1385*0Sstevel@tonic-gate !sctp_add_ftsn_set(&sets, fp, meta, &nsets, seglen)) { 1386*0Sstevel@tonic-gate meta = NULL; 1387*0Sstevel@tonic-gate sctp->sctp_adv_pap = adv_pap; 1388*0Sstevel@tonic-gate goto ftsn_done; 1389*0Sstevel@tonic-gate } 1390*0Sstevel@tonic-gate while (mp1 != NULL && SCTP_CHUNK_ISSENT(mp1)) { 1391*0Sstevel@tonic-gate sdc = (sctp_data_hdr_t *)mp1->b_rptr; 1392*0Sstevel@tonic-gate adv_pap = ntohl(sdc->sdh_tsn); 1393*0Sstevel@tonic-gate mp1 = mp1->b_next; 1394*0Sstevel@tonic-gate } 1395*0Sstevel@tonic-gate meta = meta->b_next; 1396*0Sstevel@tonic-gate if (meta != NULL) { 1397*0Sstevel@tonic-gate mp1 = meta->b_cont; 1398*0Sstevel@tonic-gate if (!SCTP_CHUNK_ISSENT(mp1)) 1399*0Sstevel@tonic-gate break; 1400*0Sstevel@tonic-gate sdc = (sctp_data_hdr_t *)mp1->b_rptr; 1401*0Sstevel@tonic-gate } 1402*0Sstevel@tonic-gate } 1403*0Sstevel@tonic-gate ftsn_done: 1404*0Sstevel@tonic-gate /* 1405*0Sstevel@tonic-gate * Can't compare with sets == NULL, since we don't add any 1406*0Sstevel@tonic-gate * sets for un-ordered messages. 1407*0Sstevel@tonic-gate */ 1408*0Sstevel@tonic-gate if (meta == meta_head) 1409*0Sstevel@tonic-gate return; 1410*0Sstevel@tonic-gate *nmp = sctp_make_ftsn_chunk(sctp, fp, sets, nsets, *seglen); 1411*0Sstevel@tonic-gate sctp_free_ftsn_set(sets); 1412*0Sstevel@tonic-gate if (*nmp == NULL) 1413*0Sstevel@tonic-gate return; 1414*0Sstevel@tonic-gate if (sctp->sctp_ftsn == sctp->sctp_lastacked + 1) { 1415*0Sstevel@tonic-gate sacklen = 0; 1416*0Sstevel@tonic-gate } else { 1417*0Sstevel@tonic-gate sacklen = sizeof (sctp_chunk_hdr_t) + 1418*0Sstevel@tonic-gate sizeof (sctp_sack_chunk_t) + 1419*0Sstevel@tonic-gate (sizeof (sctp_sack_frag_t) * sctp->sctp_sack_gaps); 1420*0Sstevel@tonic-gate if (*seglen + sacklen > sctp->sctp_lastdata->sfa_pmss) { 1421*0Sstevel@tonic-gate /* piggybacked SACK doesn't fit */ 1422*0Sstevel@tonic-gate sacklen = 0; 1423*0Sstevel@tonic-gate } else { 1424*0Sstevel@tonic-gate fp = sctp->sctp_lastdata; 1425*0Sstevel@tonic-gate } 1426*0Sstevel@tonic-gate } 1427*0Sstevel@tonic-gate head = sctp_add_proto_hdr(sctp, fp, *nmp, sacklen); 1428*0Sstevel@tonic-gate if (head == NULL) { 1429*0Sstevel@tonic-gate freemsg(*nmp); 1430*0Sstevel@tonic-gate *nmp = NULL; 1431*0Sstevel@tonic-gate return; 1432*0Sstevel@tonic-gate } 1433*0Sstevel@tonic-gate *seglen += sacklen; 1434*0Sstevel@tonic-gate *nmp = head; 1435*0Sstevel@tonic-gate 1436*0Sstevel@tonic-gate /* 1437*0Sstevel@tonic-gate * XXXNeed to optimise this, the reason it is done here is so 1438*0Sstevel@tonic-gate * that we don't have to undo in case of failure. 1439*0Sstevel@tonic-gate */ 1440*0Sstevel@tonic-gate mp1 = mp_head; 1441*0Sstevel@tonic-gate sdc = (sctp_data_hdr_t *)mp1->b_rptr; 1442*0Sstevel@tonic-gate while (meta_head != NULL && 1443*0Sstevel@tonic-gate SEQ_GEQ(sctp->sctp_adv_pap, ntohl(sdc->sdh_tsn))) { 1444*0Sstevel@tonic-gate if (!SCTP_IS_MSG_ABANDONED(meta_head)) 1445*0Sstevel@tonic-gate SCTP_MSG_SET_ABANDONED(meta_head); 1446*0Sstevel@tonic-gate while (mp1 != NULL && SCTP_CHUNK_ISSENT(mp1)) { 1447*0Sstevel@tonic-gate sdc = (sctp_data_hdr_t *)mp1->b_rptr; 1448*0Sstevel@tonic-gate if (!SCTP_CHUNK_ISACKED(mp1)) { 1449*0Sstevel@tonic-gate clen = ntohs(sdc->sdh_len) - sizeof (*sdc); 1450*0Sstevel@tonic-gate SCTP_CHUNK_SENT(sctp, mp1, sdc, fp, clen, 1451*0Sstevel@tonic-gate meta_head); 1452*0Sstevel@tonic-gate } 1453*0Sstevel@tonic-gate mp1 = mp1->b_next; 1454*0Sstevel@tonic-gate } 1455*0Sstevel@tonic-gate while (mp1 != NULL) { 1456*0Sstevel@tonic-gate sdc = (sctp_data_hdr_t *)mp1->b_rptr; 1457*0Sstevel@tonic-gate if (!SCTP_CHUNK_ABANDONED(mp1)) { 1458*0Sstevel@tonic-gate ASSERT(!SCTP_CHUNK_ISSENT(mp1)); 1459*0Sstevel@tonic-gate unsent += ntohs(sdc->sdh_len) - sizeof (*sdc); 1460*0Sstevel@tonic-gate SCTP_ABANDON_CHUNK(mp1); 1461*0Sstevel@tonic-gate } 1462*0Sstevel@tonic-gate mp1 = mp1->b_next; 1463*0Sstevel@tonic-gate } 1464*0Sstevel@tonic-gate meta_head = meta_head->b_next; 1465*0Sstevel@tonic-gate if (meta_head != NULL) { 1466*0Sstevel@tonic-gate mp1 = meta_head->b_cont; 1467*0Sstevel@tonic-gate if (!SCTP_CHUNK_ISSENT(mp1)) 1468*0Sstevel@tonic-gate break; 1469*0Sstevel@tonic-gate sdc = (sctp_data_hdr_t *)mp1->b_rptr; 1470*0Sstevel@tonic-gate } 1471*0Sstevel@tonic-gate } 1472*0Sstevel@tonic-gate if (unsent > 0) { 1473*0Sstevel@tonic-gate ASSERT(sctp->sctp_unsent >= unsent); 1474*0Sstevel@tonic-gate sctp->sctp_unsent -= unsent; 1475*0Sstevel@tonic-gate /* 1476*0Sstevel@tonic-gate * Update ULP the amount of queued data, which is 1477*0Sstevel@tonic-gate * sent-unack'ed + unsent. 1478*0Sstevel@tonic-gate */ 1479*0Sstevel@tonic-gate if (!SCTP_IS_DETACHED(sctp)) { 1480*0Sstevel@tonic-gate sctp->sctp_ulp_xmitted(sctp->sctp_ulpd, 1481*0Sstevel@tonic-gate sctp->sctp_unacked + sctp->sctp_unsent); 1482*0Sstevel@tonic-gate } 1483*0Sstevel@tonic-gate } 1484*0Sstevel@tonic-gate } 1485*0Sstevel@tonic-gate 1486*0Sstevel@tonic-gate /* 1487*0Sstevel@tonic-gate * This function steps through messages starting at meta and checks if 1488*0Sstevel@tonic-gate * the message is abandoned. It stops when it hits an unsent chunk or 1489*0Sstevel@tonic-gate * a message that has all its chunk acked. This is the only place 1490*0Sstevel@tonic-gate * where the sctp_adv_pap is moved forward to indicated abandoned 1491*0Sstevel@tonic-gate * messages. 1492*0Sstevel@tonic-gate */ 1493*0Sstevel@tonic-gate void 1494*0Sstevel@tonic-gate sctp_check_adv_ack_pt(sctp_t *sctp, mblk_t *meta, mblk_t *mp) 1495*0Sstevel@tonic-gate { 1496*0Sstevel@tonic-gate uint32_t tsn = sctp->sctp_adv_pap; 1497*0Sstevel@tonic-gate sctp_data_hdr_t *sdc; 1498*0Sstevel@tonic-gate sctp_msg_hdr_t *msg_hdr; 1499*0Sstevel@tonic-gate 1500*0Sstevel@tonic-gate ASSERT(mp != NULL); 1501*0Sstevel@tonic-gate sdc = (sctp_data_hdr_t *)mp->b_rptr; 1502*0Sstevel@tonic-gate ASSERT(SEQ_GT(ntohl(sdc->sdh_tsn), sctp->sctp_lastack_rxd)); 1503*0Sstevel@tonic-gate msg_hdr = (sctp_msg_hdr_t *)meta->b_rptr; 1504*0Sstevel@tonic-gate if (!SCTP_IS_MSG_ABANDONED(meta) && 1505*0Sstevel@tonic-gate !SCTP_MSG_TO_BE_ABANDONED(meta, msg_hdr, sctp)) { 1506*0Sstevel@tonic-gate return; 1507*0Sstevel@tonic-gate } 1508*0Sstevel@tonic-gate while (meta != NULL) { 1509*0Sstevel@tonic-gate while (mp != NULL && SCTP_CHUNK_ISSENT(mp)) { 1510*0Sstevel@tonic-gate sdc = (sctp_data_hdr_t *)mp->b_rptr; 1511*0Sstevel@tonic-gate tsn = ntohl(sdc->sdh_tsn); 1512*0Sstevel@tonic-gate mp = mp->b_next; 1513*0Sstevel@tonic-gate } 1514*0Sstevel@tonic-gate if (mp != NULL) 1515*0Sstevel@tonic-gate break; 1516*0Sstevel@tonic-gate /* 1517*0Sstevel@tonic-gate * We continue checking for successive messages only if there 1518*0Sstevel@tonic-gate * is a chunk marked for retransmission. Else, we might 1519*0Sstevel@tonic-gate * end up sending FTSN prematurely for chunks that have been 1520*0Sstevel@tonic-gate * sent, but not yet acked. 1521*0Sstevel@tonic-gate */ 1522*0Sstevel@tonic-gate if ((meta = meta->b_next) != NULL) { 1523*0Sstevel@tonic-gate msg_hdr = (sctp_msg_hdr_t *)meta->b_rptr; 1524*0Sstevel@tonic-gate if (!SCTP_IS_MSG_ABANDONED(meta) && 1525*0Sstevel@tonic-gate !SCTP_MSG_TO_BE_ABANDONED(meta, msg_hdr, sctp)) { 1526*0Sstevel@tonic-gate break; 1527*0Sstevel@tonic-gate } 1528*0Sstevel@tonic-gate for (mp = meta->b_cont; mp != NULL; mp = mp->b_next) { 1529*0Sstevel@tonic-gate if (!SCTP_CHUNK_ISSENT(mp)) { 1530*0Sstevel@tonic-gate sctp->sctp_adv_pap = tsn; 1531*0Sstevel@tonic-gate return; 1532*0Sstevel@tonic-gate } 1533*0Sstevel@tonic-gate if (SCTP_CHUNK_WANT_REXMIT(mp)) 1534*0Sstevel@tonic-gate break; 1535*0Sstevel@tonic-gate } 1536*0Sstevel@tonic-gate if (mp == NULL) 1537*0Sstevel@tonic-gate break; 1538*0Sstevel@tonic-gate } 1539*0Sstevel@tonic-gate } 1540*0Sstevel@tonic-gate sctp->sctp_adv_pap = tsn; 1541*0Sstevel@tonic-gate } 1542*0Sstevel@tonic-gate 1543*0Sstevel@tonic-gate /* 1544*0Sstevel@tonic-gate * Retransmit first segment which hasn't been acked with cumtsn or send 1545*0Sstevel@tonic-gate * a Forward TSN chunk, if appropriate. 1546*0Sstevel@tonic-gate */ 1547*0Sstevel@tonic-gate void 1548*0Sstevel@tonic-gate sctp_rexmit(sctp_t *sctp, sctp_faddr_t *oldfp) 1549*0Sstevel@tonic-gate { 1550*0Sstevel@tonic-gate mblk_t *mp; 1551*0Sstevel@tonic-gate mblk_t *nmp = NULL; 1552*0Sstevel@tonic-gate mblk_t *head; 1553*0Sstevel@tonic-gate mblk_t *meta = sctp->sctp_xmit_head; 1554*0Sstevel@tonic-gate mblk_t *fill; 1555*0Sstevel@tonic-gate uint32_t seglen = 0; 1556*0Sstevel@tonic-gate uint32_t sacklen; 1557*0Sstevel@tonic-gate uint16_t chunklen; 1558*0Sstevel@tonic-gate int extra; 1559*0Sstevel@tonic-gate sctp_data_hdr_t *sdc; 1560*0Sstevel@tonic-gate sctp_faddr_t *fp; 1561*0Sstevel@tonic-gate int error; 1562*0Sstevel@tonic-gate uint32_t adv_pap = sctp->sctp_adv_pap; 1563*0Sstevel@tonic-gate boolean_t do_ftsn = B_FALSE; 1564*0Sstevel@tonic-gate boolean_t ftsn_check = B_TRUE; 1565*0Sstevel@tonic-gate 1566*0Sstevel@tonic-gate while (meta != NULL) { 1567*0Sstevel@tonic-gate for (mp = meta->b_cont; mp != NULL; mp = mp->b_next) { 1568*0Sstevel@tonic-gate uint32_t tsn; 1569*0Sstevel@tonic-gate 1570*0Sstevel@tonic-gate if (!SCTP_CHUNK_ISSENT(mp)) 1571*0Sstevel@tonic-gate goto window_probe; 1572*0Sstevel@tonic-gate /* 1573*0Sstevel@tonic-gate * We break in the following cases - 1574*0Sstevel@tonic-gate * 1575*0Sstevel@tonic-gate * if the advanced peer ack point includes the next 1576*0Sstevel@tonic-gate * chunk to be retransmited - possibly the Forward 1577*0Sstevel@tonic-gate * TSN was lost. 1578*0Sstevel@tonic-gate * 1579*0Sstevel@tonic-gate * if we are PRSCTP aware and the next chunk to be 1580*0Sstevel@tonic-gate * retransmitted is now abandoned 1581*0Sstevel@tonic-gate * 1582*0Sstevel@tonic-gate * if the next chunk to be retransmitted is for 1583*0Sstevel@tonic-gate * the dest on which the timer went off. (this 1584*0Sstevel@tonic-gate * message is not abandoned). 1585*0Sstevel@tonic-gate * 1586*0Sstevel@tonic-gate * We check for Forward TSN only for the first 1587*0Sstevel@tonic-gate * eligible chunk to be retransmitted. The reason 1588*0Sstevel@tonic-gate * being if the first eligible chunk is skipped (say 1589*0Sstevel@tonic-gate * it was sent to a destination other than oldfp) 1590*0Sstevel@tonic-gate * then we cannot advance the cum TSN via Forward 1591*0Sstevel@tonic-gate * TSN chunk. 1592*0Sstevel@tonic-gate * 1593*0Sstevel@tonic-gate * Also, ftsn_check is B_TRUE only for the first 1594*0Sstevel@tonic-gate * eligible chunk, it will be B_FALSE for all 1595*0Sstevel@tonic-gate * subsequent candidate messages for retransmission. 1596*0Sstevel@tonic-gate */ 1597*0Sstevel@tonic-gate sdc = (sctp_data_hdr_t *)mp->b_rptr; 1598*0Sstevel@tonic-gate tsn = ntohl(sdc->sdh_tsn); 1599*0Sstevel@tonic-gate if (SEQ_GT(tsn, sctp->sctp_lastack_rxd)) { 1600*0Sstevel@tonic-gate if (sctp->sctp_prsctp_aware && ftsn_check) { 1601*0Sstevel@tonic-gate if (SEQ_GEQ(sctp->sctp_adv_pap, tsn)) { 1602*0Sstevel@tonic-gate ASSERT(sctp->sctp_prsctp_aware); 1603*0Sstevel@tonic-gate do_ftsn = B_TRUE; 1604*0Sstevel@tonic-gate goto out; 1605*0Sstevel@tonic-gate } else { 1606*0Sstevel@tonic-gate sctp_check_adv_ack_pt(sctp, 1607*0Sstevel@tonic-gate meta, mp); 1608*0Sstevel@tonic-gate if (SEQ_GT(sctp->sctp_adv_pap, 1609*0Sstevel@tonic-gate adv_pap)) { 1610*0Sstevel@tonic-gate do_ftsn = B_TRUE; 1611*0Sstevel@tonic-gate goto out; 1612*0Sstevel@tonic-gate } 1613*0Sstevel@tonic-gate } 1614*0Sstevel@tonic-gate ftsn_check = B_FALSE; 1615*0Sstevel@tonic-gate } 1616*0Sstevel@tonic-gate if (SCTP_CHUNK_DEST(mp) == oldfp) 1617*0Sstevel@tonic-gate goto out; 1618*0Sstevel@tonic-gate } 1619*0Sstevel@tonic-gate } 1620*0Sstevel@tonic-gate meta = meta->b_next; 1621*0Sstevel@tonic-gate if (meta != NULL && sctp->sctp_prsctp_aware) { 1622*0Sstevel@tonic-gate sctp_msg_hdr_t *mhdr = (sctp_msg_hdr_t *)meta->b_rptr; 1623*0Sstevel@tonic-gate 1624*0Sstevel@tonic-gate while (meta != NULL && (SCTP_IS_MSG_ABANDONED(meta) || 1625*0Sstevel@tonic-gate SCTP_MSG_TO_BE_ABANDONED(meta, mhdr, sctp))) { 1626*0Sstevel@tonic-gate meta = meta->b_next; 1627*0Sstevel@tonic-gate } 1628*0Sstevel@tonic-gate } 1629*0Sstevel@tonic-gate } 1630*0Sstevel@tonic-gate window_probe: 1631*0Sstevel@tonic-gate /* 1632*0Sstevel@tonic-gate * Retransmit fired for a destination which didn't have 1633*0Sstevel@tonic-gate * any unacked data pending. 1634*0Sstevel@tonic-gate */ 1635*0Sstevel@tonic-gate if (!sctp->sctp_unacked && sctp->sctp_unsent) { 1636*0Sstevel@tonic-gate /* 1637*0Sstevel@tonic-gate * Send a window probe. Inflate frwnd to allow 1638*0Sstevel@tonic-gate * sending one segment. 1639*0Sstevel@tonic-gate */ 1640*0Sstevel@tonic-gate if (sctp->sctp_frwnd < (oldfp->sfa_pmss - sizeof (*sdc))) { 1641*0Sstevel@tonic-gate sctp->sctp_frwnd = oldfp->sfa_pmss - sizeof (*sdc); 1642*0Sstevel@tonic-gate } 1643*0Sstevel@tonic-gate BUMP_MIB(&sctp_mib, sctpOutWinProbe); 1644*0Sstevel@tonic-gate sctp_output(sctp); 1645*0Sstevel@tonic-gate } 1646*0Sstevel@tonic-gate return; 1647*0Sstevel@tonic-gate out: 1648*0Sstevel@tonic-gate /* 1649*0Sstevel@tonic-gate * Enter slowstart for this destination 1650*0Sstevel@tonic-gate */ 1651*0Sstevel@tonic-gate oldfp->ssthresh = oldfp->cwnd / 2; 1652*0Sstevel@tonic-gate if (oldfp->ssthresh < 2 * oldfp->sfa_pmss) 1653*0Sstevel@tonic-gate oldfp->ssthresh = 2 * oldfp->sfa_pmss; 1654*0Sstevel@tonic-gate oldfp->cwnd = oldfp->sfa_pmss; 1655*0Sstevel@tonic-gate oldfp->pba = 0; 1656*0Sstevel@tonic-gate fp = sctp_rotate_faddr(sctp, oldfp); 1657*0Sstevel@tonic-gate ASSERT(fp != NULL); 1658*0Sstevel@tonic-gate sdc = (sctp_data_hdr_t *)mp->b_rptr; 1659*0Sstevel@tonic-gate 1660*0Sstevel@tonic-gate if (do_ftsn) { 1661*0Sstevel@tonic-gate sctp_make_ftsns(sctp, meta, mp, &nmp, fp, &seglen); 1662*0Sstevel@tonic-gate if (nmp == NULL) { 1663*0Sstevel@tonic-gate sctp->sctp_adv_pap = adv_pap; 1664*0Sstevel@tonic-gate goto restart_timer; 1665*0Sstevel@tonic-gate } 1666*0Sstevel@tonic-gate head = nmp; 1667*0Sstevel@tonic-gate mp = NULL; 1668*0Sstevel@tonic-gate meta = sctp->sctp_xmit_tail; 1669*0Sstevel@tonic-gate if (meta != NULL) 1670*0Sstevel@tonic-gate mp = meta->b_cont; 1671*0Sstevel@tonic-gate goto try_bundle; 1672*0Sstevel@tonic-gate } 1673*0Sstevel@tonic-gate seglen = ntohs(sdc->sdh_len); 1674*0Sstevel@tonic-gate chunklen = seglen - sizeof (*sdc); 1675*0Sstevel@tonic-gate if ((extra = seglen & (SCTP_ALIGN - 1)) != 0) 1676*0Sstevel@tonic-gate extra = SCTP_ALIGN - extra; 1677*0Sstevel@tonic-gate 1678*0Sstevel@tonic-gate /* 1679*0Sstevel@tonic-gate * Cancel RTT measurement if the retransmitted TSN is before the 1680*0Sstevel@tonic-gate * TSN used for timimg. 1681*0Sstevel@tonic-gate */ 1682*0Sstevel@tonic-gate if (sctp->sctp_out_time != 0 && 1683*0Sstevel@tonic-gate SEQ_GEQ(sctp->sctp_rtt_tsn, sdc->sdh_tsn)) { 1684*0Sstevel@tonic-gate sctp->sctp_out_time = 0; 1685*0Sstevel@tonic-gate } 1686*0Sstevel@tonic-gate /* Clear the counter as the RTT calculation may be off. */ 1687*0Sstevel@tonic-gate fp->rtt_updates = 0; 1688*0Sstevel@tonic-gate 1689*0Sstevel@tonic-gate if (sctp->sctp_ftsn == sctp->sctp_lastacked + 1) { 1690*0Sstevel@tonic-gate sacklen = 0; 1691*0Sstevel@tonic-gate } else { 1692*0Sstevel@tonic-gate sacklen = sizeof (sctp_chunk_hdr_t) + 1693*0Sstevel@tonic-gate sizeof (sctp_sack_chunk_t) + 1694*0Sstevel@tonic-gate (sizeof (sctp_sack_frag_t) * sctp->sctp_sack_gaps); 1695*0Sstevel@tonic-gate if (seglen + sacklen > sctp->sctp_lastdata->sfa_pmss) { 1696*0Sstevel@tonic-gate /* piggybacked SACK doesn't fit */ 1697*0Sstevel@tonic-gate sacklen = 0; 1698*0Sstevel@tonic-gate } else { 1699*0Sstevel@tonic-gate fp = sctp->sctp_lastdata; 1700*0Sstevel@tonic-gate } 1701*0Sstevel@tonic-gate } 1702*0Sstevel@tonic-gate 1703*0Sstevel@tonic-gate nmp = dupmsg(mp); 1704*0Sstevel@tonic-gate if (nmp == NULL) 1705*0Sstevel@tonic-gate goto restart_timer; 1706*0Sstevel@tonic-gate if (extra > 0) { 1707*0Sstevel@tonic-gate fill = sctp_get_padding(extra); 1708*0Sstevel@tonic-gate if (fill != NULL) { 1709*0Sstevel@tonic-gate linkb(nmp, fill); 1710*0Sstevel@tonic-gate seglen += extra; 1711*0Sstevel@tonic-gate } else { 1712*0Sstevel@tonic-gate freemsg(nmp); 1713*0Sstevel@tonic-gate goto restart_timer; 1714*0Sstevel@tonic-gate } 1715*0Sstevel@tonic-gate } 1716*0Sstevel@tonic-gate SCTP_CHUNK_CLEAR_FLAGS(nmp); 1717*0Sstevel@tonic-gate head = sctp_add_proto_hdr(sctp, fp, nmp, sacklen); 1718*0Sstevel@tonic-gate if (head == NULL) { 1719*0Sstevel@tonic-gate freemsg(nmp); 1720*0Sstevel@tonic-gate goto restart_timer; 1721*0Sstevel@tonic-gate } 1722*0Sstevel@tonic-gate seglen += sacklen; 1723*0Sstevel@tonic-gate 1724*0Sstevel@tonic-gate SCTP_CHUNK_SENT(sctp, mp, sdc, fp, chunklen, meta); 1725*0Sstevel@tonic-gate 1726*0Sstevel@tonic-gate mp = mp->b_next; 1727*0Sstevel@tonic-gate try_bundle: 1728*0Sstevel@tonic-gate while (seglen < fp->sfa_pmss) { 1729*0Sstevel@tonic-gate int32_t new_len; 1730*0Sstevel@tonic-gate 1731*0Sstevel@tonic-gate while (mp != NULL) { 1732*0Sstevel@tonic-gate if (SCTP_CHUNK_CANSEND(mp)) 1733*0Sstevel@tonic-gate break; 1734*0Sstevel@tonic-gate mp = mp->b_next; 1735*0Sstevel@tonic-gate } 1736*0Sstevel@tonic-gate if (mp == NULL) { 1737*0Sstevel@tonic-gate meta = sctp_get_msg_to_send(sctp, &mp, meta->b_next, 1738*0Sstevel@tonic-gate &error, 0, 0, oldfp); 1739*0Sstevel@tonic-gate if (error != 0 || meta == NULL) 1740*0Sstevel@tonic-gate break; 1741*0Sstevel@tonic-gate ASSERT(mp != NULL); 1742*0Sstevel@tonic-gate sctp->sctp_xmit_tail = meta; 1743*0Sstevel@tonic-gate } 1744*0Sstevel@tonic-gate sdc = (sctp_data_hdr_t *)mp->b_rptr; 1745*0Sstevel@tonic-gate chunklen = ntohs(sdc->sdh_len) - sizeof (*sdc); 1746*0Sstevel@tonic-gate new_len = seglen + ntohs(sdc->sdh_len); 1747*0Sstevel@tonic-gate 1748*0Sstevel@tonic-gate if (seglen & (SCTP_ALIGN - 1)) { 1749*0Sstevel@tonic-gate extra = SCTP_ALIGN - (seglen & (SCTP_ALIGN - 1)); 1750*0Sstevel@tonic-gate 1751*0Sstevel@tonic-gate if (new_len + extra > fp->sfa_pmss) { 1752*0Sstevel@tonic-gate break; 1753*0Sstevel@tonic-gate } 1754*0Sstevel@tonic-gate fill = sctp_get_padding(extra); 1755*0Sstevel@tonic-gate if (fill != NULL) { 1756*0Sstevel@tonic-gate new_len += extra; 1757*0Sstevel@tonic-gate linkb(head, fill); 1758*0Sstevel@tonic-gate } else { 1759*0Sstevel@tonic-gate break; 1760*0Sstevel@tonic-gate } 1761*0Sstevel@tonic-gate } else { 1762*0Sstevel@tonic-gate if (new_len > fp->sfa_pmss) { 1763*0Sstevel@tonic-gate break; 1764*0Sstevel@tonic-gate } 1765*0Sstevel@tonic-gate } 1766*0Sstevel@tonic-gate if ((nmp = dupmsg(mp)) == NULL) { 1767*0Sstevel@tonic-gate break; 1768*0Sstevel@tonic-gate } 1769*0Sstevel@tonic-gate seglen = new_len; 1770*0Sstevel@tonic-gate 1771*0Sstevel@tonic-gate SCTP_CHUNK_CLEAR_FLAGS(nmp); 1772*0Sstevel@tonic-gate SCTP_CHUNK_SENT(sctp, mp, sdc, fp, chunklen, meta); 1773*0Sstevel@tonic-gate linkb(head, nmp); 1774*0Sstevel@tonic-gate mp = mp->b_next; 1775*0Sstevel@tonic-gate } 1776*0Sstevel@tonic-gate if ((seglen > fp->sfa_pmss) && fp->isv4) { 1777*0Sstevel@tonic-gate ipha_t *iph = (ipha_t *)head->b_rptr; 1778*0Sstevel@tonic-gate 1779*0Sstevel@tonic-gate /* 1780*0Sstevel@tonic-gate * Path MTU is different from path we thought it would 1781*0Sstevel@tonic-gate * be when we created chunks, or IP headers have grown. 1782*0Sstevel@tonic-gate * Need to clear the DF bit. 1783*0Sstevel@tonic-gate */ 1784*0Sstevel@tonic-gate iph->ipha_fragment_offset_and_flags = 0; 1785*0Sstevel@tonic-gate } 1786*0Sstevel@tonic-gate dprint(2, ("sctp_rexmit: Sending packet %d bytes, tsn %x " 1787*0Sstevel@tonic-gate "ssn %d to %p (rwnd %d, lastack_rxd %x)\n", 1788*0Sstevel@tonic-gate seglen, ntohl(sdc->sdh_tsn), ntohs(sdc->sdh_ssn), fp, 1789*0Sstevel@tonic-gate sctp->sctp_frwnd, sctp->sctp_lastack_rxd)); 1790*0Sstevel@tonic-gate 1791*0Sstevel@tonic-gate sctp_set_iplen(sctp, head); 1792*0Sstevel@tonic-gate sctp_add_sendq(sctp, head); 1793*0Sstevel@tonic-gate 1794*0Sstevel@tonic-gate /* 1795*0Sstevel@tonic-gate * Restart timer with exponential backoff 1796*0Sstevel@tonic-gate */ 1797*0Sstevel@tonic-gate restart_timer: 1798*0Sstevel@tonic-gate oldfp->strikes++; 1799*0Sstevel@tonic-gate sctp->sctp_strikes++; 1800*0Sstevel@tonic-gate SCTP_CALC_RXT(oldfp, sctp->sctp_rto_max); 1801*0Sstevel@tonic-gate SCTP_FADDR_TIMER_RESTART(sctp, fp, fp->rto); 1802*0Sstevel@tonic-gate if (oldfp->suna != 0) 1803*0Sstevel@tonic-gate SCTP_FADDR_TIMER_RESTART(sctp, oldfp, oldfp->rto); 1804*0Sstevel@tonic-gate sctp->sctp_active = lbolt64; 1805*0Sstevel@tonic-gate } 1806*0Sstevel@tonic-gate 1807*0Sstevel@tonic-gate /* 1808*0Sstevel@tonic-gate * The SCTP write put procedure called from IP. 1809*0Sstevel@tonic-gate */ 1810*0Sstevel@tonic-gate void 1811*0Sstevel@tonic-gate sctp_wput(queue_t *q, mblk_t *mp) 1812*0Sstevel@tonic-gate { 1813*0Sstevel@tonic-gate uchar_t *rptr; 1814*0Sstevel@tonic-gate t_scalar_t type; 1815*0Sstevel@tonic-gate 1816*0Sstevel@tonic-gate switch (mp->b_datap->db_type) { 1817*0Sstevel@tonic-gate case M_IOCTL: 1818*0Sstevel@tonic-gate sctp_wput_ioctl(q, mp); 1819*0Sstevel@tonic-gate break; 1820*0Sstevel@tonic-gate case M_DATA: 1821*0Sstevel@tonic-gate /* Should be handled in sctp_output() */ 1822*0Sstevel@tonic-gate ASSERT(0); 1823*0Sstevel@tonic-gate freemsg(mp); 1824*0Sstevel@tonic-gate break; 1825*0Sstevel@tonic-gate case M_PROTO: 1826*0Sstevel@tonic-gate case M_PCPROTO: 1827*0Sstevel@tonic-gate rptr = mp->b_rptr; 1828*0Sstevel@tonic-gate if ((mp->b_wptr - rptr) >= sizeof (t_scalar_t)) { 1829*0Sstevel@tonic-gate type = ((union T_primitives *)rptr)->type; 1830*0Sstevel@tonic-gate /* 1831*0Sstevel@tonic-gate * There is no "standard" way on how to respond 1832*0Sstevel@tonic-gate * to T_CAPABILITY_REQ if a module does not 1833*0Sstevel@tonic-gate * understand it. And the current TI mod 1834*0Sstevel@tonic-gate * has problems handling an error ack. So we 1835*0Sstevel@tonic-gate * catch the request here and reply with a response 1836*0Sstevel@tonic-gate * which the TI mod knows how to respond to. 1837*0Sstevel@tonic-gate */ 1838*0Sstevel@tonic-gate switch (type) { 1839*0Sstevel@tonic-gate case T_CAPABILITY_REQ: 1840*0Sstevel@tonic-gate (void) putnextctl1(RD(q), M_ERROR, EPROTO); 1841*0Sstevel@tonic-gate break; 1842*0Sstevel@tonic-gate default: 1843*0Sstevel@tonic-gate if ((mp = mi_tpi_err_ack_alloc(mp, 1844*0Sstevel@tonic-gate TNOTSUPPORT, 0)) != NULL) { 1845*0Sstevel@tonic-gate qreply(q, mp); 1846*0Sstevel@tonic-gate return; 1847*0Sstevel@tonic-gate } 1848*0Sstevel@tonic-gate } 1849*0Sstevel@tonic-gate } 1850*0Sstevel@tonic-gate /* FALLTHRU */ 1851*0Sstevel@tonic-gate default: 1852*0Sstevel@tonic-gate freemsg(mp); 1853*0Sstevel@tonic-gate return; 1854*0Sstevel@tonic-gate } 1855*0Sstevel@tonic-gate } 1856