1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 2004 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 #include <sys/types.h> 30 #include <sys/poll.h> 31 #include <dhcpmsg.h> 32 33 #include "interface.h" 34 #include "ipc_action.h" 35 #include "util.h" 36 37 static iu_tq_callback_t ipc_action_timeout; 38 39 /* 40 * ipc_action_init(): initializes the ipc_action structure 41 * 42 * input: struct ifslist *: the interface to initialize it for 43 * output: void 44 */ 45 46 void 47 ipc_action_init(struct ifslist *ifsp) 48 { 49 ifsp->if_ia.ia_tid = -1; 50 } 51 52 /* 53 * ipc_action_start(): starts an ipc_action request on an interface 54 * 55 * input: struct ifslist *: the interface to start the action on 56 * dhcp_ipc_request_t *: the type of request 57 * int: the descriptor to contact the action requestor 58 * output: int: 1 if the request is started successfully, 0 otherwise 59 */ 60 61 int 62 ipc_action_start(struct ifslist *ifsp, dhcp_ipc_request_t *request, int fd) 63 { 64 if (request->timeout == DHCP_IPC_WAIT_DEFAULT) 65 request->timeout = DHCP_IPC_DEFAULT_WAIT; 66 67 ifsp->if_ia.ia_request = request; 68 ifsp->if_ia.ia_fd = fd; 69 ifsp->if_ia.ia_cmd = DHCP_IPC_CMD(request->message_type); 70 71 if (request->timeout == DHCP_IPC_WAIT_FOREVER) 72 ifsp->if_ia.ia_tid = -1; 73 else { 74 ifsp->if_ia.ia_tid = iu_schedule_timer(tq, request->timeout, 75 ipc_action_timeout, ifsp); 76 77 if (ifsp->if_ia.ia_tid == -1) 78 return (0); 79 80 hold_ifs(ifsp); 81 } 82 83 return (1); 84 } 85 86 /* 87 * ipc_action_pending(): checks if there is a pending ipc_action request on 88 * an interface 89 * 90 * input: struct ifslist *: the interface to check for a pending ipc_action on 91 * output: boolean_t: B_TRUE if there is a pending ipc_action request 92 */ 93 94 boolean_t 95 ipc_action_pending(struct ifslist *ifsp) 96 { 97 struct pollfd pollfd; 98 99 if (ifsp->if_ia.ia_fd > 0) { 100 101 pollfd.events = POLLIN; 102 pollfd.fd = ifsp->if_ia.ia_fd; 103 104 if (poll(&pollfd, 1, 0) == 0) 105 return (B_TRUE); 106 } 107 108 return (B_FALSE); 109 } 110 111 /* 112 * ipc_action_finish(): completes an ipc_action request on an interface 113 * 114 * input: struct ifslist *: the interface to complete the action on 115 * int: the reason why the action finished (nonzero on error) 116 * output: void 117 */ 118 119 void 120 ipc_action_finish(struct ifslist *ifsp, int reason) 121 { 122 struct ipc_action *ia = &ifsp->if_ia; 123 124 if (ipc_action_pending(ifsp) == B_FALSE) 125 return; 126 127 if (reason == 0) 128 send_ok_reply(ia->ia_request, &ia->ia_fd); 129 else 130 send_error_reply(ia->ia_request, reason, &ia->ia_fd); 131 132 ipc_action_cancel_timer(ifsp); 133 } 134 135 /* 136 * ipc_action_timeout(): times out an ipc_action on an interface (the request 137 * continues asynchronously, however) 138 * 139 * input: iu_tq_t *: unused 140 * void *: the struct ifslist * the ipc_action was pending on 141 * output: void 142 */ 143 144 /* ARGSUSED */ 145 static void 146 ipc_action_timeout(iu_tq_t *tq, void *arg) 147 { 148 struct ifslist *ifsp = (struct ifslist *)arg; 149 struct ipc_action *ia = &ifsp->if_ia; 150 151 if (check_ifs(ifsp) == 0) { 152 (void) release_ifs(ifsp); 153 return; 154 } 155 156 dhcpmsg(MSG_VERBOSE, "ipc timeout waiting for agent to complete " 157 "command %d for %s", ia->ia_cmd, ifsp->if_name); 158 159 send_error_reply(ia->ia_request, DHCP_IPC_E_TIMEOUT, &ia->ia_fd); 160 ia->ia_tid = -1; 161 } 162 163 /* 164 * ipc_action_cancel_timer(): cancels the pending ipc_action timer for this 165 * request 166 * 167 * input: struct ifslist *: the interface with a pending request to cancel 168 * output: void 169 */ 170 171 void 172 ipc_action_cancel_timer(struct ifslist *ifsp) 173 { 174 if (ifsp->if_ia.ia_tid == -1) 175 return; 176 177 /* 178 * if we can't cancel this timer, we're really in the 179 * twilight zone. however, as long as we don't drop the 180 * reference to the ifsp, it shouldn't hurt us 181 */ 182 183 if (iu_cancel_timer(tq, ifsp->if_ia.ia_tid, NULL) == 1) { 184 ifsp->if_ia.ia_tid = -1; 185 (void) release_ifs(ifsp); 186 } 187 } 188