sctp_peeloff.c revision 218235
1/*- 2 * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved. 3 * Copyright (c) 2008-2011, by Randall Stewart, rrs@lakerest.net and 4 * Michael Tuexen, tuexen@fh-muenster.de 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions are met: 9 * 10 * a) Redistributions of source code must retain the above copyright notice, 11 * this list of conditions and the following disclaimer. 12 * 13 * b) Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in 15 * the documentation and/or other materials provided with the distribution. 16 * 17 * c) Neither the name of Cisco Systems, Inc. nor the names of its 18 * contributors may be used to endorse or promote products derived 19 * from this software without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 22 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 23 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 25 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 30 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 31 * THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 35/* $KAME: sctp_peeloff.c,v 1.13 2005/03/06 16:04:18 itojun Exp $ */ 36 37#include <sys/cdefs.h> 38__FBSDID("$FreeBSD: head/sys/netinet/sctp_peeloff.c 218235 2011-02-03 19:59:00Z tuexen $"); 39#include <netinet/sctp_os.h> 40#include <netinet/sctp_pcb.h> 41#include <netinet/sctputil.h> 42#include <netinet/sctp_var.h> 43#include <netinet/sctp_var.h> 44#include <netinet/sctp_sysctl.h> 45#include <netinet/sctp.h> 46#include <netinet/sctp_uio.h> 47#include <netinet/sctp_peeloff.h> 48#include <netinet/sctputil.h> 49#include <netinet/sctp_auth.h> 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 uint32_t state; 58 59 inp = (struct sctp_inpcb *)head->so_pcb; 60 if (inp == NULL) { 61 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, EFAULT); 62 return (EFAULT); 63 } 64 stcb = sctp_findassociation_ep_asocid(inp, assoc_id, 1); 65 if (stcb == NULL) { 66 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_PEELOFF, ENOENT); 67 return (ENOENT); 68 } 69 state = SCTP_GET_STATE((&stcb->asoc)); 70 if ((state == SCTP_STATE_EMPTY) || 71 (state == SCTP_STATE_INUSE) || 72 (state == SCTP_STATE_COOKIE_WAIT) || 73 (state == SCTP_STATE_COOKIE_ECHOED)) { 74 SCTP_TCB_UNLOCK(stcb); 75 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_PEELOFF, ENOTCONN); 76 return (ENOTCONN); 77 } 78 SCTP_TCB_UNLOCK(stcb); 79 /* We are clear to peel this one off */ 80 return (0); 81} 82 83int 84sctp_do_peeloff(struct socket *head, struct socket *so, sctp_assoc_t assoc_id) 85{ 86 struct sctp_inpcb *inp, *n_inp; 87 struct sctp_tcb *stcb; 88 uint32_t state; 89 90 inp = (struct sctp_inpcb *)head->so_pcb; 91 if (inp == NULL) { 92 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, EFAULT); 93 return (EFAULT); 94 } 95 stcb = sctp_findassociation_ep_asocid(inp, assoc_id, 1); 96 if (stcb == NULL) { 97 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, ENOTCONN); 98 return (ENOTCONN); 99 } 100 state = SCTP_GET_STATE((&stcb->asoc)); 101 if ((state == SCTP_STATE_EMPTY) || 102 (state == SCTP_STATE_INUSE) || 103 (state == SCTP_STATE_COOKIE_WAIT) || 104 (state == SCTP_STATE_COOKIE_ECHOED)) { 105 SCTP_TCB_UNLOCK(stcb); 106 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, ENOTCONN); 107 return (ENOTCONN); 108 } 109 n_inp = (struct sctp_inpcb *)so->so_pcb; 110 n_inp->sctp_flags = (SCTP_PCB_FLAGS_UDPTYPE | 111 SCTP_PCB_FLAGS_CONNECTED | 112 SCTP_PCB_FLAGS_IN_TCPPOOL | /* Turn on Blocking IO */ 113 (SCTP_PCB_COPY_FLAGS & inp->sctp_flags)); 114 n_inp->sctp_socket = so; 115 n_inp->sctp_features = inp->sctp_features; 116 n_inp->sctp_mobility_features = inp->sctp_mobility_features; 117 n_inp->sctp_frag_point = inp->sctp_frag_point; 118 n_inp->sctp_cmt_on_off = inp->sctp_cmt_on_off; 119 n_inp->sctp_ecn_enable = inp->sctp_ecn_enable; 120 n_inp->partial_delivery_point = inp->partial_delivery_point; 121 n_inp->sctp_context = inp->sctp_context; 122 n_inp->inp_starting_point_for_iterator = NULL; 123 /* copy in the authentication parameters from the original endpoint */ 124 if (n_inp->sctp_ep.local_hmacs) 125 sctp_free_hmaclist(n_inp->sctp_ep.local_hmacs); 126 n_inp->sctp_ep.local_hmacs = 127 sctp_copy_hmaclist(inp->sctp_ep.local_hmacs); 128 if (n_inp->sctp_ep.local_auth_chunks) 129 sctp_free_chunklist(n_inp->sctp_ep.local_auth_chunks); 130 n_inp->sctp_ep.local_auth_chunks = 131 sctp_copy_chunklist(inp->sctp_ep.local_auth_chunks); 132 (void)sctp_copy_skeylist(&inp->sctp_ep.shared_keys, 133 &n_inp->sctp_ep.shared_keys); 134 /* 135 * Now we must move it from one hash table to another and get the 136 * stcb in the right place. 137 */ 138 sctp_move_pcb_and_assoc(inp, n_inp, stcb); 139 atomic_add_int(&stcb->asoc.refcnt, 1); 140 SCTP_TCB_UNLOCK(stcb); 141 142 sctp_pull_off_control_to_new_inp(inp, n_inp, stcb, SBL_WAIT); 143 atomic_subtract_int(&stcb->asoc.refcnt, 1); 144 145 return (0); 146} 147 148 149struct socket * 150sctp_get_peeloff(struct socket *head, sctp_assoc_t assoc_id, int *error) 151{ 152 struct socket *newso; 153 struct sctp_inpcb *inp, *n_inp; 154 struct sctp_tcb *stcb; 155 156 SCTPDBG(SCTP_DEBUG_PEEL1, "SCTP peel-off called\n"); 157 inp = (struct sctp_inpcb *)head->so_pcb; 158 if (inp == NULL) { 159 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, EFAULT); 160 *error = EFAULT; 161 return (NULL); 162 } 163 stcb = sctp_findassociation_ep_asocid(inp, assoc_id, 1); 164 if (stcb == NULL) { 165 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, ENOTCONN); 166 *error = ENOTCONN; 167 return (NULL); 168 } 169 atomic_add_int(&stcb->asoc.refcnt, 1); 170 SCTP_TCB_UNLOCK(stcb); 171 newso = sonewconn(head, SS_ISCONNECTED 172 ); 173 if (newso == NULL) { 174 SCTPDBG(SCTP_DEBUG_PEEL1, "sctp_peeloff:sonewconn failed\n"); 175 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_PEELOFF, ENOMEM); 176 *error = ENOMEM; 177 atomic_subtract_int(&stcb->asoc.refcnt, 1); 178 return (NULL); 179 180 } 181 SCTP_TCB_LOCK(stcb); 182 atomic_subtract_int(&stcb->asoc.refcnt, 1); 183 n_inp = (struct sctp_inpcb *)newso->so_pcb; 184 SOCK_LOCK(head); 185 n_inp->sctp_flags = (SCTP_PCB_FLAGS_UDPTYPE | 186 SCTP_PCB_FLAGS_CONNECTED | 187 SCTP_PCB_FLAGS_IN_TCPPOOL | /* Turn on Blocking IO */ 188 (SCTP_PCB_COPY_FLAGS & inp->sctp_flags)); 189 n_inp->sctp_features = inp->sctp_features; 190 n_inp->sctp_frag_point = inp->sctp_frag_point; 191 n_inp->sctp_cmt_on_off = inp->sctp_cmt_on_off; 192 n_inp->sctp_ecn_enable = inp->sctp_ecn_enable; 193 n_inp->partial_delivery_point = inp->partial_delivery_point; 194 n_inp->sctp_context = inp->sctp_context; 195 n_inp->inp_starting_point_for_iterator = NULL; 196 197 /* copy in the authentication parameters from the original endpoint */ 198 if (n_inp->sctp_ep.local_hmacs) 199 sctp_free_hmaclist(n_inp->sctp_ep.local_hmacs); 200 n_inp->sctp_ep.local_hmacs = 201 sctp_copy_hmaclist(inp->sctp_ep.local_hmacs); 202 if (n_inp->sctp_ep.local_auth_chunks) 203 sctp_free_chunklist(n_inp->sctp_ep.local_auth_chunks); 204 n_inp->sctp_ep.local_auth_chunks = 205 sctp_copy_chunklist(inp->sctp_ep.local_auth_chunks); 206 (void)sctp_copy_skeylist(&inp->sctp_ep.shared_keys, 207 &n_inp->sctp_ep.shared_keys); 208 209 n_inp->sctp_socket = newso; 210 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 211 sctp_feature_off(n_inp, SCTP_PCB_FLAGS_AUTOCLOSE); 212 n_inp->sctp_ep.auto_close_time = 0; 213 sctp_timer_stop(SCTP_TIMER_TYPE_AUTOCLOSE, n_inp, stcb, NULL, 214 SCTP_FROM_SCTP_PEELOFF + SCTP_LOC_1); 215 } 216 /* Turn off any non-blocking semantic. */ 217 SCTP_CLEAR_SO_NBIO(newso); 218 newso->so_state |= SS_ISCONNECTED; 219 /* We remove it right away */ 220 221#ifdef SCTP_LOCK_LOGGING 222 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOCK_LOGGING_ENABLE) { 223 sctp_log_lock(inp, (struct sctp_tcb *)NULL, SCTP_LOG_LOCK_SOCK); 224 } 225#endif 226 TAILQ_REMOVE(&head->so_comp, newso, so_list); 227 head->so_qlen--; 228 SOCK_UNLOCK(head); 229 /* 230 * Now we must move it from one hash table to another and get the 231 * stcb in the right place. 232 */ 233 sctp_move_pcb_and_assoc(inp, n_inp, stcb); 234 atomic_add_int(&stcb->asoc.refcnt, 1); 235 SCTP_TCB_UNLOCK(stcb); 236 /* 237 * And now the final hack. We move data in the pending side i.e. 238 * head to the new socket buffer. Let the GRUBBING begin :-0 239 */ 240 sctp_pull_off_control_to_new_inp(inp, n_inp, stcb, SBL_WAIT); 241 atomic_subtract_int(&stcb->asoc.refcnt, 1); 242 return (newso); 243} 244