1 /* 2 * Copyright (c) 2009-2013 Apple Inc. All rights reserved. 3 * 4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ 5 * 6 * This file contains Original Code and/or Modifications of Original Code 7 * as defined in and that are subject to the Apple Public Source License 8 * Version 2.0 (the 'License'). You may not use this file except in 9 * compliance with the License. The rights granted to you under the License 10 * may not be used to create, or enable the creation or redistribution of, 11 * unlawful or unlicensed copies of an Apple operating system, or to 12 * circumvent, violate, or enable the circumvention or violation of, any 13 * terms of an Apple operating system software license agreement. 14 * 15 * Please obtain a copy of the License at 16 * http://www.opensource.apple.com/apsl/ and read it before using this file. 17 * 18 * The Original Code and all software distributed under the License are 19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 23 * Please see the License for the specific language governing rights and 24 * limitations under the License. 25 * 26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 27 */ 28 29 #ifndef _NETINET_IN_ARP_H_ 30 #define _NETINET_IN_ARP_H_ 31 #ifdef KERNEL 32 #include <sys/kernel_types.h> 33 34 struct sockaddr; 35 struct sockaddr_dl; 36 struct sockaddr_in; 37 38 /*! 39 * @function inet_arp_lookup 40 * @discussion This function will check the routing table for a cached 41 * arp entry or trigger an arp query to resolve the ip address to a 42 * link-layer address. 43 * 44 * Arp entries are stored in the routing table. This function will 45 * lookup the ip destination in the routing table. If the 46 * destination requires forwarding to a gateway, the route of the 47 * gateway will be looked up. The route entry is inspected to 48 * determine if the link layer destination address is known. If 49 * unknown, the arp generation function for IP attached to the 50 * interface is called to create an arp request packet. 51 * @param interface The interface the packet is being sent on. 52 * @param ip_dest The ip destination of the packet. 53 * @param ll_dest On output, the link-layer destination. 54 * @param ll_dest_len The length of the buffer for ll_dest. 55 * @param hint Any routing hint passed down from the protocol. 56 * @param packet The packet being transmitted. 57 * @result May return an error such as EHOSTDOWN or ENETUNREACH. If 58 * this function returns EJUSTRETURN, the packet has been queued 59 * and will be sent when an arp response is received. If any other 60 * value is returned, the caller is responsible for disposing of 61 * the packet. 62 */ 63 #ifdef BSD_KERNEL_PRIVATE 64 extern boolean_t arp_is_entry_probing(route_t p_route); 65 extern errno_t arp_lookup_ip(ifnet_t interface, 66 const struct sockaddr_in *ip_dest, struct sockaddr_dl *ll_dest, 67 size_t ll_dest_len, route_t hint, mbuf_t packet); 68 #define inet_arp_lookup arp_lookup_ip 69 #else 70 extern errno_t inet_arp_lookup(ifnet_t interface, 71 const struct sockaddr_in *ip_dest, struct sockaddr_dl *ll_dest, 72 size_t ll_dest_len, route_t hint, mbuf_t packet); 73 #endif /* !BSD_KERNEL_PRIVATE */ 74 75 /*! 76 * @function inet_arp_handle_input 77 * @discussion This function should be called by code that handles 78 * inbound arp packets. The caller should parse the ARP packet to 79 * pull out the operation and the relevant addresses. If a response 80 * is required, the proto_media_send_arp function will be called. 81 * 82 * This function will lookup the sender in the routing table and 83 * add an arp entry if necessary. Any queued packets waiting for 84 * the arp resolution will also be transmitted. 85 * @param interface The interface the packet was received on. 86 * @param arp_op The arp operation, ARPOP_REQUEST or ARPOP_REPLY 87 * @param sender_hw The sender hardware address from the arp payload. 88 * @param sender_ip The sender IP address from the arp payload. 89 * @param target_ip The target IP address from the arp payload. 90 * @result 0 on success or an errno error value on failure. 91 */ 92 #ifdef BSD_KERNEL_PRIVATE 93 extern errno_t arp_ip_handle_input(ifnet_t ifp, u_int16_t arpop, 94 const struct sockaddr_dl *sender_hw, const struct sockaddr_in *sender_ip, 95 const struct sockaddr_in *target_ip); 96 #define inet_arp_handle_input arp_ip_handle_input 97 #else 98 extern errno_t inet_arp_handle_input(ifnet_t ifp, u_int16_t arpop, 99 const struct sockaddr_dl *sender_hw, const struct sockaddr_in *sender_ip, 100 const struct sockaddr_in *target_ip); 101 #endif /* !BSD_KERNEL_PRIVATE */ 102 103 /*! 104 * @function inet_arp_init_ifaddr 105 * @discussion This function should be called in two places, when an IP 106 * address is added and when the hardware address changes. This 107 * function will setup the ifaddr_t for use with the IP ARP 108 * functions. This function will also trigger the transmission of a 109 * gratuitous ARP packet. 110 * 111 * When the SIOCSIFADDR ioctl is handled, the data parameter will 112 * be an ifaddr_t. If this is an IP address, inet_arp_init_ifaddr 113 * should be called. This is usually performed in the protocol 114 * attachment's ioctl handler. 115 * 116 * When the event handler for the protocol attachment receives a 117 * KEV_DL_LINK_ADDRESS_CHANGED event, the event handler should call 118 * inet_arp_init_ifaddr for each interface ip address. 119 * 120 * For an example, see bsd/net/ether_inet_pr_module.c in xnu. 121 * Search for inet_arp_init_ifaddr. 122 * @param interface The interface the packet was received on. 123 * @param ipaddr The ip interface address. 124 */ 125 #ifdef BSD_KERNEL_PRIVATE 126 /* inet_arp_init_ifaddr is aliased to arp_ifinit (if_ether.h) */ 127 #define inet_arp_init_ifaddr arp_ifinit 128 #else 129 extern void inet_arp_init_ifaddr(ifnet_t interface, ifaddr_t ipaddr); 130 #endif /* !BSD_KERNEL_PRIVATE */ 131 132 #ifdef BSD_KERNEL_PRIVATE 133 extern void arp_init(void); 134 extern void in_arpdrain(void *); 135 extern void arp_llreach_set_reachable(struct ifnet *, void *, unsigned int); 136 #endif /* BSD_KERNEL_PRIVATE */ 137 #endif /* KERNEL */ 138 #endif /* _NETINET_IN_ARP_H_ */ 139