sctp_peeloff.c revision 167598
1/*- 2 * Copyright (c) 2001-2007, 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 167598 2007-03-15 11:27:14Z rrs $"); 36#include <netinet/sctp_os.h> 37#include <netinet/sctp_pcb.h> 38#include <netinet/sctp.h> 39#include <netinet/sctp_uio.h> 40#include <netinet/sctp_var.h> 41#include <netinet/sctp_peeloff.h> 42#include <netinet/sctputil.h> 43#include <netinet/sctp_auth.h> 44 45 46#ifdef SCTP_DEBUG 47extern uint32_t sctp_debug_on; 48 49#endif /* SCTP_DEBUG */ 50 51 52int 53sctp_can_peel_off(struct socket *head, sctp_assoc_t assoc_id) 54{ 55 struct sctp_inpcb *inp; 56 struct sctp_tcb *stcb; 57 58 inp = (struct sctp_inpcb *)head->so_pcb; 59 if (inp == NULL) { 60 return (EFAULT); 61 } 62 stcb = sctp_findassociation_ep_asocid(inp, assoc_id, 1); 63 if (stcb == NULL) { 64 return (ENOTCONN); 65 } 66 SCTP_TCB_UNLOCK(stcb); 67 /* We are clear to peel this one off */ 68 return (0); 69} 70 71int 72sctp_do_peeloff(struct socket *head, struct socket *so, sctp_assoc_t assoc_id) 73{ 74 struct sctp_inpcb *inp, *n_inp; 75 struct sctp_tcb *stcb; 76 77 inp = (struct sctp_inpcb *)head->so_pcb; 78 if (inp == NULL) 79 return (EFAULT); 80 stcb = sctp_findassociation_ep_asocid(inp, assoc_id, 1); 81 if (stcb == NULL) 82 return (ENOTCONN); 83 84 n_inp = (struct sctp_inpcb *)so->so_pcb; 85 n_inp->sctp_flags = (SCTP_PCB_FLAGS_UDPTYPE | 86 SCTP_PCB_FLAGS_CONNECTED | 87 SCTP_PCB_FLAGS_IN_TCPPOOL | /* Turn on Blocking IO */ 88 (SCTP_PCB_COPY_FLAGS & inp->sctp_flags)); 89 n_inp->sctp_socket = so; 90 n_inp->sctp_features = inp->sctp_features; 91 n_inp->sctp_frag_point = inp->sctp_frag_point; 92 n_inp->partial_delivery_point = inp->partial_delivery_point; 93 n_inp->sctp_context = inp->sctp_context; 94 n_inp->inp_starting_point_for_iterator = NULL; 95 96 /* 97 * Now we must move it from one hash table to another and get the 98 * stcb in the right place. 99 */ 100 sctp_move_pcb_and_assoc(inp, n_inp, stcb); 101 102 sctp_pull_off_control_to_new_inp(inp, n_inp, stcb); 103 104 SCTP_TCB_UNLOCK(stcb); 105 return (0); 106} 107 108struct socket * 109sctp_get_peeloff(struct socket *head, sctp_assoc_t assoc_id, int *error) 110{ 111 struct socket *newso; 112 struct sctp_inpcb *inp, *n_inp; 113 struct sctp_tcb *stcb; 114 115#ifdef SCTP_DEBUG 116 if (sctp_debug_on & SCTP_DEBUG_PEEL1) { 117 printf("SCTP peel-off called\n"); 118 } 119#endif /* SCTP_DEBUG */ 120 121 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#ifdef SCTP_DEBUG 135 if (sctp_debug_on & SCTP_DEBUG_PEEL1) { 136 printf("sctp_peeloff:sonewconn failed err\n"); 137 } 138#endif /* SCTP_DEBUG */ 139 *error = ENOMEM; 140 SCTP_TCB_UNLOCK(stcb); 141 return (NULL); 142 } 143 n_inp = (struct sctp_inpcb *)newso->so_pcb; 144 SOCK_LOCK(head); 145 SCTP_INP_WLOCK(inp); 146 SCTP_INP_WLOCK(n_inp); 147 n_inp->sctp_flags = (SCTP_PCB_FLAGS_UDPTYPE | 148 SCTP_PCB_FLAGS_CONNECTED | 149 SCTP_PCB_FLAGS_IN_TCPPOOL | /* Turn on Blocking IO */ 150 (SCTP_PCB_COPY_FLAGS & inp->sctp_flags)); 151 n_inp->sctp_features = inp->sctp_features; 152 n_inp->sctp_frag_point = inp->sctp_frag_point; 153 n_inp->partial_delivery_point = inp->partial_delivery_point; 154 n_inp->sctp_context = inp->sctp_context; 155 n_inp->inp_starting_point_for_iterator = NULL; 156 157 /* copy in the authentication parameters from the original endpoint */ 158 if (n_inp->sctp_ep.local_hmacs) 159 sctp_free_hmaclist(n_inp->sctp_ep.local_hmacs); 160 n_inp->sctp_ep.local_hmacs = 161 sctp_copy_hmaclist(inp->sctp_ep.local_hmacs); 162 if (n_inp->sctp_ep.local_auth_chunks) 163 sctp_free_chunklist(n_inp->sctp_ep.local_auth_chunks); 164 n_inp->sctp_ep.local_auth_chunks = 165 sctp_copy_chunklist(inp->sctp_ep.local_auth_chunks); 166 (void)sctp_copy_skeylist(&inp->sctp_ep.shared_keys, 167 &n_inp->sctp_ep.shared_keys); 168 169 n_inp->sctp_socket = newso; 170 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 171 sctp_feature_off(n_inp, SCTP_PCB_FLAGS_AUTOCLOSE); 172 n_inp->sctp_ep.auto_close_time = 0; 173 sctp_timer_stop(SCTP_TIMER_TYPE_AUTOCLOSE, n_inp, stcb, NULL, 174 SCTP_FROM_SCTP_PEELOFF + SCTP_LOC_1); 175 } 176 /* Turn off any non-blocking semantic. */ 177 SCTP_CLEAR_SO_NBIO(newso); 178 newso->so_state |= SS_ISCONNECTED; 179 /* We remove it right away */ 180#ifdef SCTP_LOCK_LOGGING 181 sctp_log_lock(inp, (struct sctp_tcb *)NULL, SCTP_LOG_LOCK_SOCK); 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 /* 194 * And now the final hack. We move data in the pending side i.e. 195 * head to the new socket buffer. Let the GRUBBING begin :-0 196 */ 197 sctp_pull_off_control_to_new_inp(inp, n_inp, stcb); 198 199 SCTP_TCB_UNLOCK(stcb); 200 return (newso); 201} 202