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