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 (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright 2007 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 * 25 * INFORM_SENT state of the client state machine. 26 */ 27 28 #pragma ident "%Z%%M% %I% %E% SMI" 29 30 #include <sys/types.h> 31 #include <time.h> 32 #include <sys/socket.h> 33 #include <netinet/in.h> 34 #include <netinet/udp.h> 35 #include <netinet/ip_var.h> 36 #include <netinet/udp_var.h> 37 #include <dhcpmsg.h> 38 39 #include "agent.h" 40 #include "states.h" 41 #include "interface.h" 42 #include "packet.h" 43 44 static boolean_t stop_informing(dhcp_smach_t *, unsigned int); 45 46 /* 47 * dhcp_inform(): sends an INFORM packet and sets up reception for an ACK 48 * 49 * input: dhcp_smach_t *: the state machine to use 50 * output: void 51 * note: the INFORM cannot be sent successfully if the interface 52 * does not have an IP address (this is mostly an issue for IPv4). 53 */ 54 55 void 56 dhcp_inform(dhcp_smach_t *dsmp) 57 { 58 dhcp_pkt_t *dpkt; 59 60 if (!set_smach_state(dsmp, INIT)) 61 goto failed; 62 63 if (dsmp->dsm_isv6) { 64 dpkt = init_pkt(dsmp, DHCPV6_MSG_INFO_REQ); 65 66 /* Add required Option Request option */ 67 (void) add_pkt_prl(dpkt, dsmp); 68 dsmp->dsm_server = ipv6_all_dhcp_relay_and_servers; 69 (void) send_pkt_v6(dsmp, dpkt, dsmp->dsm_server, 70 stop_informing, DHCPV6_INF_TIMEOUT, DHCPV6_INF_MAX_RT); 71 } else { 72 ipaddr_t server; 73 74 /* 75 * Assemble a DHCPREQUEST packet, without the Server ID option. 76 * Fill in ciaddr, since we know this. dsm_server will be set 77 * to the server's IP address, which will be the broadcast 78 * address if we don't know it. The max DHCP message size 79 * option is set to the interface max, minus the size of the 80 * UDP and IP headers. 81 */ 82 83 dpkt = init_pkt(dsmp, INFORM); 84 IN6_V4MAPPED_TO_INADDR(&dsmp->dsm_lif->lif_v6addr, 85 &dpkt->pkt->ciaddr); 86 87 (void) add_pkt_opt16(dpkt, CD_MAX_DHCP_SIZE, 88 htons(dsmp->dsm_lif->lif_pif->pif_max - 89 sizeof (struct udpiphdr))); 90 if (class_id_len != 0) { 91 (void) add_pkt_opt(dpkt, CD_CLASS_ID, class_id, 92 class_id_len); 93 } 94 (void) add_pkt_prl(dpkt, dsmp); 95 (void) add_pkt_opt(dpkt, CD_END, NULL, 0); 96 97 IN6_V4MAPPED_TO_IPADDR(&dsmp->dsm_server, server); 98 if (!send_pkt(dsmp, dpkt, server, NULL)) { 99 dhcpmsg(MSG_ERROR, "dhcp_inform: send_pkt failed"); 100 goto failed; 101 } 102 } 103 104 if (!set_smach_state(dsmp, INFORM_SENT)) 105 goto failed; 106 107 return; 108 109 failed: 110 dsmp->dsm_dflags |= DHCP_IF_FAILED; 111 ipc_action_finish(dsmp, DHCP_IPC_E_INT); 112 } 113 114 /* 115 * stop_informing(): decides when to stop retransmitting Information-Requests 116 * 117 * input: dhcp_smach_t *: the state machine Info-Reqs are being sent from 118 * unsigned int: the number of requests sent so far 119 * output: boolean_t: B_TRUE if retransmissions should stop 120 */ 121 122 /* ARGSUSED */ 123 static boolean_t 124 stop_informing(dhcp_smach_t *dsmp, unsigned int n_requests) 125 { 126 return (B_FALSE); 127 } 128