sctp_peeloff.c revision 175845
1163953Srrs/*- 2169382Srrs * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved. 3163953Srrs * 4163953Srrs * Redistribution and use in source and binary forms, with or without 5163953Srrs * modification, are permitted provided that the following conditions are met: 6163953Srrs * 7163953Srrs * a) Redistributions of source code must retain the above copyright notice, 8163953Srrs * this list of conditions and the following disclaimer. 9163953Srrs * 10163953Srrs * b) Redistributions in binary form must reproduce the above copyright 11163953Srrs * notice, this list of conditions and the following disclaimer in 12163953Srrs * the documentation and/or other materials provided with the distribution. 13163953Srrs * 14163953Srrs * c) Neither the name of Cisco Systems, Inc. nor the names of its 15163953Srrs * contributors may be used to endorse or promote products derived 16163953Srrs * from this software without specific prior written permission. 17163953Srrs * 18163953Srrs * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19163953Srrs * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 20163953Srrs * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21163953Srrs * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 22163953Srrs * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23163953Srrs * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24163953Srrs * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25163953Srrs * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26163953Srrs * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27163953Srrs * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 28163953Srrs * THE POSSIBILITY OF SUCH DAMAGE. 29163953Srrs */ 30163953Srrs 31163953Srrs 32163953Srrs/* $KAME: sctp_peeloff.c,v 1.13 2005/03/06 16:04:18 itojun Exp $ */ 33163953Srrs 34163953Srrs#include <sys/cdefs.h> 35163953Srrs__FBSDID("$FreeBSD: head/sys/netinet/sctp_peeloff.c 175845 2008-01-31 08:22:24Z rwatson $"); 36163953Srrs#include <netinet/sctp_os.h> 37163953Srrs#include <netinet/sctp_pcb.h> 38170744Srrs#include <netinet/sctputil.h> 39170744Srrs#include <netinet/sctp_var.h> 40170744Srrs#include <netinet/sctp_var.h> 41170744Srrs#include <netinet/sctp_sysctl.h> 42163953Srrs#include <netinet/sctp.h> 43163953Srrs#include <netinet/sctp_uio.h> 44163953Srrs#include <netinet/sctp_peeloff.h> 45163953Srrs#include <netinet/sctputil.h> 46163953Srrs#include <netinet/sctp_auth.h> 47163953Srrs 48163953Srrs 49163953Srrsint 50163953Srrssctp_can_peel_off(struct socket *head, sctp_assoc_t assoc_id) 51163953Srrs{ 52163953Srrs struct sctp_inpcb *inp; 53163953Srrs struct sctp_tcb *stcb; 54171477Srrs uint32_t state; 55163953Srrs 56163953Srrs inp = (struct sctp_inpcb *)head->so_pcb; 57163953Srrs if (inp == NULL) { 58171943Srrs SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, EFAULT); 59163953Srrs return (EFAULT); 60163953Srrs } 61163953Srrs stcb = sctp_findassociation_ep_asocid(inp, assoc_id, 1); 62163953Srrs if (stcb == NULL) { 63172090Srrs SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_PEELOFF, ENOENT); 64172090Srrs return (ENOENT); 65163953Srrs } 66171477Srrs state = SCTP_GET_STATE((&stcb->asoc)); 67171477Srrs if ((state == SCTP_STATE_EMPTY) || 68171477Srrs (state == SCTP_STATE_INUSE) || 69171477Srrs (state == SCTP_STATE_COOKIE_WAIT) || 70171477Srrs (state == SCTP_STATE_COOKIE_ECHOED)) { 71171477Srrs SCTP_TCB_UNLOCK(stcb); 72171943Srrs SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_PEELOFF, ENOTCONN); 73171477Srrs return (ENOTCONN); 74171477Srrs } 75163953Srrs SCTP_TCB_UNLOCK(stcb); 76163953Srrs /* We are clear to peel this one off */ 77163953Srrs return (0); 78163953Srrs} 79163953Srrs 80163953Srrsint 81163953Srrssctp_do_peeloff(struct socket *head, struct socket *so, sctp_assoc_t assoc_id) 82163953Srrs{ 83163953Srrs struct sctp_inpcb *inp, *n_inp; 84163953Srrs struct sctp_tcb *stcb; 85171477Srrs uint32_t state; 86163953Srrs 87163953Srrs inp = (struct sctp_inpcb *)head->so_pcb; 88171943Srrs if (inp == NULL) { 89171943Srrs SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, EFAULT); 90163953Srrs return (EFAULT); 91171943Srrs } 92163953Srrs stcb = sctp_findassociation_ep_asocid(inp, assoc_id, 1); 93171943Srrs if (stcb == NULL) { 94171943Srrs SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, ENOTCONN); 95163953Srrs return (ENOTCONN); 96171943Srrs } 97171477Srrs state = SCTP_GET_STATE((&stcb->asoc)); 98171477Srrs if ((state == SCTP_STATE_EMPTY) || 99171477Srrs (state == SCTP_STATE_INUSE) || 100171477Srrs (state == SCTP_STATE_COOKIE_WAIT) || 101171477Srrs (state == SCTP_STATE_COOKIE_ECHOED)) { 102171477Srrs SCTP_TCB_UNLOCK(stcb); 103171943Srrs SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, ENOTCONN); 104171477Srrs return (ENOTCONN); 105171477Srrs } 106163953Srrs n_inp = (struct sctp_inpcb *)so->so_pcb; 107163953Srrs n_inp->sctp_flags = (SCTP_PCB_FLAGS_UDPTYPE | 108163953Srrs SCTP_PCB_FLAGS_CONNECTED | 109163953Srrs SCTP_PCB_FLAGS_IN_TCPPOOL | /* Turn on Blocking IO */ 110163953Srrs (SCTP_PCB_COPY_FLAGS & inp->sctp_flags)); 111163953Srrs n_inp->sctp_socket = so; 112163953Srrs n_inp->sctp_features = inp->sctp_features; 113171990Srrs n_inp->sctp_mobility_features = inp->sctp_mobility_features; 114163953Srrs n_inp->sctp_frag_point = inp->sctp_frag_point; 115163953Srrs n_inp->partial_delivery_point = inp->partial_delivery_point; 116163953Srrs n_inp->sctp_context = inp->sctp_context; 117163953Srrs n_inp->inp_starting_point_for_iterator = NULL; 118171990Srrs /* copy in the authentication parameters from the original endpoint */ 119171990Srrs if (n_inp->sctp_ep.local_hmacs) 120171990Srrs sctp_free_hmaclist(n_inp->sctp_ep.local_hmacs); 121171990Srrs n_inp->sctp_ep.local_hmacs = 122171990Srrs sctp_copy_hmaclist(inp->sctp_ep.local_hmacs); 123171990Srrs if (n_inp->sctp_ep.local_auth_chunks) 124171990Srrs sctp_free_chunklist(n_inp->sctp_ep.local_auth_chunks); 125171990Srrs n_inp->sctp_ep.local_auth_chunks = 126171990Srrs sctp_copy_chunklist(inp->sctp_ep.local_auth_chunks); 127171990Srrs (void)sctp_copy_skeylist(&inp->sctp_ep.shared_keys, 128171990Srrs &n_inp->sctp_ep.shared_keys); 129163953Srrs /* 130163953Srrs * Now we must move it from one hash table to another and get the 131163953Srrs * stcb in the right place. 132163953Srrs */ 133163953Srrs sctp_move_pcb_and_assoc(inp, n_inp, stcb); 134170056Srrs atomic_add_int(&stcb->asoc.refcnt, 1); 135170056Srrs SCTP_TCB_UNLOCK(stcb); 136163953Srrs 137175845Srwatson sctp_pull_off_control_to_new_inp(inp, n_inp, stcb, SBL_WAIT); 138170056Srrs atomic_subtract_int(&stcb->asoc.refcnt, 1); 139163953Srrs 140163953Srrs return (0); 141163953Srrs} 142163953Srrs 143168709Srrs 144163953Srrsstruct socket * 145163953Srrssctp_get_peeloff(struct socket *head, sctp_assoc_t assoc_id, int *error) 146163953Srrs{ 147163953Srrs struct socket *newso; 148163953Srrs struct sctp_inpcb *inp, *n_inp; 149163953Srrs struct sctp_tcb *stcb; 150163953Srrs 151169420Srrs SCTPDBG(SCTP_DEBUG_PEEL1, "SCTP peel-off called\n"); 152163953Srrs inp = (struct sctp_inpcb *)head->so_pcb; 153163953Srrs if (inp == NULL) { 154171943Srrs SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, EFAULT); 155163953Srrs *error = EFAULT; 156163953Srrs return (NULL); 157163953Srrs } 158163953Srrs stcb = sctp_findassociation_ep_asocid(inp, assoc_id, 1); 159163953Srrs if (stcb == NULL) { 160171943Srrs SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, ENOTCONN); 161163953Srrs *error = ENOTCONN; 162163953Srrs return (NULL); 163163953Srrs } 164172090Srrs atomic_add_int(&stcb->asoc.refcnt, 1); 165172090Srrs SCTP_TCB_UNLOCK(stcb); 166163953Srrs newso = sonewconn(head, SS_ISCONNECTED 167163953Srrs ); 168163953Srrs if (newso == NULL) { 169169420Srrs SCTPDBG(SCTP_DEBUG_PEEL1, "sctp_peeloff:sonewconn failed\n"); 170171943Srrs SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_PEELOFF, ENOMEM); 171163953Srrs *error = ENOMEM; 172172090Srrs atomic_subtract_int(&stcb->asoc.refcnt, 1); 173163953Srrs return (NULL); 174170056Srrs 175163953Srrs } 176172090Srrs SCTP_TCB_LOCK(stcb); 177172090Srrs atomic_subtract_int(&stcb->asoc.refcnt, 1); 178163953Srrs n_inp = (struct sctp_inpcb *)newso->so_pcb; 179163953Srrs SOCK_LOCK(head); 180163953Srrs n_inp->sctp_flags = (SCTP_PCB_FLAGS_UDPTYPE | 181163953Srrs SCTP_PCB_FLAGS_CONNECTED | 182163953Srrs SCTP_PCB_FLAGS_IN_TCPPOOL | /* Turn on Blocking IO */ 183163953Srrs (SCTP_PCB_COPY_FLAGS & inp->sctp_flags)); 184163953Srrs n_inp->sctp_features = inp->sctp_features; 185163953Srrs n_inp->sctp_frag_point = inp->sctp_frag_point; 186163953Srrs n_inp->partial_delivery_point = inp->partial_delivery_point; 187163953Srrs n_inp->sctp_context = inp->sctp_context; 188163953Srrs n_inp->inp_starting_point_for_iterator = NULL; 189163953Srrs 190163953Srrs /* copy in the authentication parameters from the original endpoint */ 191163953Srrs if (n_inp->sctp_ep.local_hmacs) 192163953Srrs sctp_free_hmaclist(n_inp->sctp_ep.local_hmacs); 193163953Srrs n_inp->sctp_ep.local_hmacs = 194163953Srrs sctp_copy_hmaclist(inp->sctp_ep.local_hmacs); 195163953Srrs if (n_inp->sctp_ep.local_auth_chunks) 196163953Srrs sctp_free_chunklist(n_inp->sctp_ep.local_auth_chunks); 197163953Srrs n_inp->sctp_ep.local_auth_chunks = 198163953Srrs sctp_copy_chunklist(inp->sctp_ep.local_auth_chunks); 199163953Srrs (void)sctp_copy_skeylist(&inp->sctp_ep.shared_keys, 200163953Srrs &n_inp->sctp_ep.shared_keys); 201163953Srrs 202163953Srrs n_inp->sctp_socket = newso; 203163953Srrs if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 204163953Srrs sctp_feature_off(n_inp, SCTP_PCB_FLAGS_AUTOCLOSE); 205163953Srrs n_inp->sctp_ep.auto_close_time = 0; 206165220Srrs sctp_timer_stop(SCTP_TIMER_TYPE_AUTOCLOSE, n_inp, stcb, NULL, 207165220Srrs SCTP_FROM_SCTP_PEELOFF + SCTP_LOC_1); 208163953Srrs } 209163953Srrs /* Turn off any non-blocking semantic. */ 210167598Srrs SCTP_CLEAR_SO_NBIO(newso); 211163953Srrs newso->so_state |= SS_ISCONNECTED; 212163953Srrs /* We remove it right away */ 213168709Srrs 214163953Srrs#ifdef SCTP_LOCK_LOGGING 215170744Srrs if (sctp_logging_level & SCTP_LOCK_LOGGING_ENABLE) { 216170744Srrs sctp_log_lock(inp, (struct sctp_tcb *)NULL, SCTP_LOG_LOCK_SOCK); 217170744Srrs } 218163953Srrs#endif 219163953Srrs TAILQ_REMOVE(&head->so_comp, newso, so_list); 220163953Srrs head->so_qlen--; 221163953Srrs SOCK_UNLOCK(head); 222163953Srrs /* 223163953Srrs * Now we must move it from one hash table to another and get the 224163953Srrs * stcb in the right place. 225163953Srrs */ 226163953Srrs sctp_move_pcb_and_assoc(inp, n_inp, stcb); 227170056Srrs atomic_add_int(&stcb->asoc.refcnt, 1); 228170056Srrs SCTP_TCB_UNLOCK(stcb); 229163953Srrs /* 230163953Srrs * And now the final hack. We move data in the pending side i.e. 231163953Srrs * head to the new socket buffer. Let the GRUBBING begin :-0 232163953Srrs */ 233175845Srwatson sctp_pull_off_control_to_new_inp(inp, n_inp, stcb, SBL_WAIT); 234170056Srrs atomic_subtract_int(&stcb->asoc.refcnt, 1); 235163953Srrs return (newso); 236163953Srrs} 237