sctp_peeloff.c revision 170744
1/*- 2 * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are met: 6 * 7 * a) Redistributions of source code must retain the above copyright notice, 8 * this list of conditions and the following disclaimer. 9 * 10 * b) Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in 12 * the documentation and/or other materials provided with the distribution. 13 * 14 * c) Neither the name of Cisco Systems, Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived 16 * from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 20 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 28 * THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 32/* $KAME: sctp_peeloff.c,v 1.13 2005/03/06 16:04:18 itojun Exp $ */ 33 34#include <sys/cdefs.h> 35__FBSDID("$FreeBSD: head/sys/netinet/sctp_peeloff.c 170744 2007-06-14 22:59:04Z rrs $"); 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#ifdef SCTP_DEBUG 49extern uint32_t sctp_debug_on; 50 51#endif /* SCTP_DEBUG */ 52 53 54int 55sctp_can_peel_off(struct socket *head, sctp_assoc_t assoc_id) 56{ 57 struct sctp_inpcb *inp; 58 struct sctp_tcb *stcb; 59 60 inp = (struct sctp_inpcb *)head->so_pcb; 61 if (inp == NULL) { 62 return (EFAULT); 63 } 64 stcb = sctp_findassociation_ep_asocid(inp, assoc_id, 1); 65 if (stcb == NULL) { 66 return (ENOTCONN); 67 } 68 SCTP_TCB_UNLOCK(stcb); 69 /* We are clear to peel this one off */ 70 return (0); 71} 72 73int 74sctp_do_peeloff(struct socket *head, struct socket *so, sctp_assoc_t assoc_id) 75{ 76 struct sctp_inpcb *inp, *n_inp; 77 struct sctp_tcb *stcb; 78 79 inp = (struct sctp_inpcb *)head->so_pcb; 80 if (inp == NULL) 81 return (EFAULT); 82 stcb = sctp_findassociation_ep_asocid(inp, assoc_id, 1); 83 if (stcb == NULL) 84 return (ENOTCONN); 85 86 n_inp = (struct sctp_inpcb *)so->so_pcb; 87 n_inp->sctp_flags = (SCTP_PCB_FLAGS_UDPTYPE | 88 SCTP_PCB_FLAGS_CONNECTED | 89 SCTP_PCB_FLAGS_IN_TCPPOOL | /* Turn on Blocking IO */ 90 (SCTP_PCB_COPY_FLAGS & inp->sctp_flags)); 91 n_inp->sctp_socket = so; 92 n_inp->sctp_features = inp->sctp_features; 93 n_inp->sctp_frag_point = inp->sctp_frag_point; 94 n_inp->partial_delivery_point = inp->partial_delivery_point; 95 n_inp->sctp_context = inp->sctp_context; 96 n_inp->inp_starting_point_for_iterator = NULL; 97 98 /* 99 * Now we must move it from one hash table to another and get the 100 * stcb in the right place. 101 */ 102 sctp_move_pcb_and_assoc(inp, n_inp, stcb); 103 atomic_add_int(&stcb->asoc.refcnt, 1); 104 SCTP_TCB_UNLOCK(stcb); 105 106 sctp_pull_off_control_to_new_inp(inp, n_inp, stcb, M_WAITOK); 107 atomic_subtract_int(&stcb->asoc.refcnt, 1); 108 109 return (0); 110} 111 112 113struct socket * 114sctp_get_peeloff(struct socket *head, sctp_assoc_t assoc_id, int *error) 115{ 116 struct socket *newso; 117 struct sctp_inpcb *inp, *n_inp; 118 struct sctp_tcb *stcb; 119 120 SCTPDBG(SCTP_DEBUG_PEEL1, "SCTP peel-off called\n"); 121 inp = (struct sctp_inpcb *)head->so_pcb; 122 if (inp == NULL) { 123 *error = EFAULT; 124 return (NULL); 125 } 126 stcb = sctp_findassociation_ep_asocid(inp, assoc_id, 1); 127 if (stcb == NULL) { 128 *error = ENOTCONN; 129 return (NULL); 130 } 131 newso = sonewconn(head, SS_ISCONNECTED 132 ); 133 if (newso == NULL) { 134 SCTPDBG(SCTP_DEBUG_PEEL1, "sctp_peeloff:sonewconn failed\n"); 135 *error = ENOMEM; 136 SCTP_TCB_UNLOCK(stcb); 137 return (NULL); 138 139 } 140 n_inp = (struct sctp_inpcb *)newso->so_pcb; 141 SOCK_LOCK(head); 142 SCTP_INP_WLOCK(inp); 143 SCTP_INP_WLOCK(n_inp); 144 n_inp->sctp_flags = (SCTP_PCB_FLAGS_UDPTYPE | 145 SCTP_PCB_FLAGS_CONNECTED | 146 SCTP_PCB_FLAGS_IN_TCPPOOL | /* Turn on Blocking IO */ 147 (SCTP_PCB_COPY_FLAGS & inp->sctp_flags)); 148 n_inp->sctp_features = inp->sctp_features; 149 n_inp->sctp_frag_point = inp->sctp_frag_point; 150 n_inp->partial_delivery_point = inp->partial_delivery_point; 151 n_inp->sctp_context = inp->sctp_context; 152 n_inp->inp_starting_point_for_iterator = NULL; 153 154 /* copy in the authentication parameters from the original endpoint */ 155 if (n_inp->sctp_ep.local_hmacs) 156 sctp_free_hmaclist(n_inp->sctp_ep.local_hmacs); 157 n_inp->sctp_ep.local_hmacs = 158 sctp_copy_hmaclist(inp->sctp_ep.local_hmacs); 159 if (n_inp->sctp_ep.local_auth_chunks) 160 sctp_free_chunklist(n_inp->sctp_ep.local_auth_chunks); 161 n_inp->sctp_ep.local_auth_chunks = 162 sctp_copy_chunklist(inp->sctp_ep.local_auth_chunks); 163 (void)sctp_copy_skeylist(&inp->sctp_ep.shared_keys, 164 &n_inp->sctp_ep.shared_keys); 165 166 n_inp->sctp_socket = newso; 167 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 168 sctp_feature_off(n_inp, SCTP_PCB_FLAGS_AUTOCLOSE); 169 n_inp->sctp_ep.auto_close_time = 0; 170 sctp_timer_stop(SCTP_TIMER_TYPE_AUTOCLOSE, n_inp, stcb, NULL, 171 SCTP_FROM_SCTP_PEELOFF + SCTP_LOC_1); 172 } 173 /* Turn off any non-blocking semantic. */ 174 SCTP_CLEAR_SO_NBIO(newso); 175 newso->so_state |= SS_ISCONNECTED; 176 /* We remove it right away */ 177 178#ifdef SCTP_LOCK_LOGGING 179 if (sctp_logging_level & SCTP_LOCK_LOGGING_ENABLE) { 180 sctp_log_lock(inp, (struct sctp_tcb *)NULL, SCTP_LOG_LOCK_SOCK); 181 } 182#endif 183 TAILQ_REMOVE(&head->so_comp, newso, so_list); 184 head->so_qlen--; 185 SOCK_UNLOCK(head); 186 /* 187 * Now we must move it from one hash table to another and get the 188 * stcb in the right place. 189 */ 190 SCTP_INP_WUNLOCK(n_inp); 191 SCTP_INP_WUNLOCK(inp); 192 sctp_move_pcb_and_assoc(inp, n_inp, stcb); 193 atomic_add_int(&stcb->asoc.refcnt, 1); 194 SCTP_TCB_UNLOCK(stcb); 195 /* 196 * And now the final hack. We move data in the pending side i.e. 197 * head to the new socket buffer. Let the GRUBBING begin :-0 198 */ 199 sctp_pull_off_control_to_new_inp(inp, n_inp, stcb, M_WAITOK); 200 atomic_subtract_int(&stcb->asoc.refcnt, 1); 201 202 return (newso); 203} 204