1/*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved. 5 * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved. 6 * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions are met: 10 * 11 * a) Redistributions of source code must retain the above copyright notice, 12 * this list of conditions and the following disclaimer. 13 * 14 * b) Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in 16 * the documentation and/or other materials provided with the distribution. 17 * 18 * c) Neither the name of Cisco Systems, Inc. nor the names of its 19 * contributors may be used to endorse or promote products derived 20 * from this software without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 23 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 24 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 26 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 32 * THE POSSIBILITY OF SUCH DAMAGE. 33 */ 34 35#include <netinet/sctp_os.h> 36#include <netinet/sctp_pcb.h> 37#include <netinet/sctputil.h> 38#include <netinet/sctp_var.h> 39#include <netinet/sctp_var.h> 40#include <netinet/sctp_sysctl.h> 41#include <netinet/sctp.h> 42#include <netinet/sctp_uio.h> 43#include <netinet/sctp_peeloff.h> 44#include <netinet/sctputil.h> 45#include <netinet/sctp_auth.h> 46 47int 48sctp_can_peel_off(struct socket *head, sctp_assoc_t assoc_id) 49{ 50 struct sctp_inpcb *inp; 51 struct sctp_tcb *stcb; 52 uint32_t state; 53 54 if (head == NULL) { 55 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, EBADF); 56 return (EBADF); 57 } 58 inp = (struct sctp_inpcb *)head->so_pcb; 59 if (inp == NULL) { 60 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, EFAULT); 61 return (EFAULT); 62 } 63 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 64 (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 65 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, EOPNOTSUPP); 66 return (EOPNOTSUPP); 67 } 68 stcb = sctp_findassociation_ep_asocid(inp, assoc_id, 1); 69 if (stcb == NULL) { 70 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_PEELOFF, ENOENT); 71 return (ENOENT); 72 } 73 state = SCTP_GET_STATE(stcb); 74 if ((state == SCTP_STATE_EMPTY) || 75 (state == SCTP_STATE_INUSE)) { 76 SCTP_TCB_UNLOCK(stcb); 77 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_PEELOFF, ENOTCONN); 78 return (ENOTCONN); 79 } 80 SCTP_TCB_UNLOCK(stcb); 81 /* We are clear to peel this one off */ 82 return (0); 83} 84 85int 86sctp_do_peeloff(struct socket *head, struct socket *so, sctp_assoc_t assoc_id) 87{ 88 struct sctp_inpcb *inp, *n_inp; 89 struct sctp_tcb *stcb; 90 uint32_t state; 91 92 inp = (struct sctp_inpcb *)head->so_pcb; 93 if (inp == NULL) { 94 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, EFAULT); 95 return (EFAULT); 96 } 97 stcb = sctp_findassociation_ep_asocid(inp, assoc_id, 1); 98 if (stcb == NULL) { 99 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, ENOTCONN); 100 return (ENOTCONN); 101 } 102 103 state = SCTP_GET_STATE(stcb); 104 if ((state == SCTP_STATE_EMPTY) || 105 (state == SCTP_STATE_INUSE)) { 106 SCTP_TCB_UNLOCK(stcb); 107 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, ENOTCONN); 108 return (ENOTCONN); 109 } 110 111 n_inp = (struct sctp_inpcb *)so->so_pcb; 112 n_inp->sctp_flags = (SCTP_PCB_FLAGS_UDPTYPE | 113 SCTP_PCB_FLAGS_CONNECTED | 114 SCTP_PCB_FLAGS_IN_TCPPOOL | /* Turn on Blocking IO */ 115 (SCTP_PCB_COPY_FLAGS & inp->sctp_flags)); 116 n_inp->sctp_socket = so; 117 n_inp->sctp_features = inp->sctp_features; 118 n_inp->sctp_mobility_features = inp->sctp_mobility_features; 119 n_inp->sctp_frag_point = inp->sctp_frag_point; 120 n_inp->sctp_cmt_on_off = inp->sctp_cmt_on_off; 121 n_inp->ecn_supported = inp->ecn_supported; 122 n_inp->prsctp_supported = inp->prsctp_supported; 123 n_inp->auth_supported = inp->auth_supported; 124 n_inp->asconf_supported = inp->asconf_supported; 125 n_inp->reconfig_supported = inp->reconfig_supported; 126 n_inp->nrsack_supported = inp->nrsack_supported; 127 n_inp->pktdrop_supported = inp->pktdrop_supported; 128 n_inp->partial_delivery_point = inp->partial_delivery_point; 129 n_inp->sctp_context = inp->sctp_context; 130 n_inp->max_cwnd = inp->max_cwnd; 131 n_inp->local_strreset_support = inp->local_strreset_support; 132 /* copy in the authentication parameters from the original endpoint */ 133 if (n_inp->sctp_ep.local_hmacs) 134 sctp_free_hmaclist(n_inp->sctp_ep.local_hmacs); 135 n_inp->sctp_ep.local_hmacs = 136 sctp_copy_hmaclist(inp->sctp_ep.local_hmacs); 137 if (n_inp->sctp_ep.local_auth_chunks) 138 sctp_free_chunklist(n_inp->sctp_ep.local_auth_chunks); 139 n_inp->sctp_ep.local_auth_chunks = 140 sctp_copy_chunklist(inp->sctp_ep.local_auth_chunks); 141 (void)sctp_copy_skeylist(&inp->sctp_ep.shared_keys, 142 &n_inp->sctp_ep.shared_keys); 143 /* 144 * Now we must move it from one hash table to another and get the 145 * stcb in the right place. 146 */ 147 sctp_move_pcb_and_assoc(inp, n_inp, stcb); 148 atomic_add_int(&stcb->asoc.refcnt, 1); 149 SCTP_TCB_UNLOCK(stcb); 150 151 sctp_pull_off_control_to_new_inp(inp, n_inp, stcb, SBL_WAIT); 152 atomic_subtract_int(&stcb->asoc.refcnt, 1); 153 154 return (0); 155} 156