/* * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. * * @APPLE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this * file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_LICENSE_HEADER_END@ */ /* ----------------------------------------------------------------------------- * * Theory of operation : * * This file implements the ip protocol module for the ppp interface * ----------------------------------------------------------------------------- */ /* ----------------------------------------------------------------------------- Includes ----------------------------------------------------------------------------- */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "ppp_defs.h" // public ppp values #include "ppp_ip.h" #include "ppp_domain.h" #include "ppp_if.h" #include "if_ppplink.h" /* ----------------------------------------------------------------------------- Definitions ----------------------------------------------------------------------------- */ /* ----------------------------------------------------------------------------- Forward declarations ----------------------------------------------------------------------------- */ static errno_t ppp_ip_input(ifnet_t ifp, protocol_family_t protocol, mbuf_t packet, char* header); static errno_t ppp_ip_preoutput(ifnet_t ifp, protocol_family_t protocol, mbuf_t *packet, const struct sockaddr *dest, void *route, char *frame_type, char *link_layer_dest); static errno_t ppp_ip_ioctl(ifnet_t ifp, protocol_family_t protocol, u_int32_t command, void* argument); /* ----------------------------------------------------------------------------- Globals ----------------------------------------------------------------------------- */ extern lck_mtx_t *ppp_domain_mutex; /* ----------------------------------------------------------------------------- init function ----------------------------------------------------------------------------- */ int ppp_ip_init(int init_arg) { return proto_register_plumber(PF_INET, APPLE_IF_FAM_PPP, ppp_ip_attach, ppp_ip_detach); } /* ----------------------------------------------------------------------------- terminate function ----------------------------------------------------------------------------- */ int ppp_ip_dispose(int term_arg) { proto_unregister_plumber(PF_INET, APPLE_IF_FAM_PPP); return 0; } /* ----------------------------------------------------------------------------- attach the PPPx interface ifp to the network protocol IP, called when the ppp interface is ready for ppp traffic ----------------------------------------------------------------------------- */ errno_t ppp_ip_attach(ifnet_t ifp, protocol_family_t protocol) { int ret; struct ifnet_attach_proto_param reg; struct ppp_if *wan = (struct ppp_if *)ifnet_softc(ifp); LOGDBG(ifp, (LOGVAL, "ppp_ip_attach: name = %s, unit = %d\n", ifnet_name(ifp), ifnet_unit(ifp))); if (wan->ip_attached) return 0; // already attached bzero(®, sizeof(struct ifnet_attach_proto_param)); reg.input = ppp_ip_input; reg.pre_output = ppp_ip_preoutput; reg.ioctl = ppp_ip_ioctl; ret = ifnet_attach_protocol(ifp, PF_INET, ®); LOGRETURN(ret, ret, "ppp_ip_attach: ifnet_attach_protocol error = 0x%x\n"); LOGDBG(ifp, (LOGVAL, "ppp_i6_attach: ifnet_attach_protocol family = 0x%x\n", protocol)); ifnet_find_by_name("lo0", &wan->lo_ifp); wan->ip_attached = 1; return 0; } /* ----------------------------------------------------------------------------- detach the PPPx interface ifp from the network protocol IP, called when the ppp interface stops ip traffic ----------------------------------------------------------------------------- */ void ppp_ip_detach(ifnet_t ifp, protocol_family_t protocol) { int ret; struct ppp_if *wan = (struct ppp_if *)ifnet_softc(ifp); LOGDBG(ifp, (LOGVAL, "ppp_ip_detach\n")); if (!wan->ip_attached) return; // already detached ifnet_release(wan->lo_ifp); wan->lo_ifp = 0; ret = ifnet_detach_protocol(ifp, PF_INET); if (ret) log(LOGVAL, "ppp_ip_detach: ifnet_detach_protocol error = 0x%x\n", ret); wan->ip_attached = 0; } /* ----------------------------------------------------------------------------- called from dlil when an ioctl is sent to the interface ----------------------------------------------------------------------------- */ errno_t ppp_ip_ioctl(ifnet_t ifp, protocol_family_t protocol, u_int32_t command, void* argument) { struct ifaddr *ifa = (struct ifaddr *)argument; //struct in_ifaddr *ia = (struct in_ifaddr *)data; struct ppp_if *wan = (struct ppp_if *)ifnet_softc(ifp); struct sockaddr_in *addr = (struct sockaddr_in *)ifa->ifa_addr; int error = 0; switch (command) { case SIOCSIFADDR: case SIOCAIFADDR: LOGDBG(ifp, (LOGVAL, "ppp_ip_ioctl: cmd = SIOCSIFADDR/SIOCAIFADDR\n")); // only an IPv4 address should arrive here if (ifa->ifa_addr->sa_family != AF_INET) { error = EAFNOSUPPORT; break; } wan->ip_src.s_addr = addr->sin_addr.s_addr; /* XXX very dirty... in.c doesn't pass the destination address to dlil but it happens to be the next address in the in_aliasreq */ addr++; wan->ip_dst.s_addr = addr->sin_addr.s_addr; break; default : error = EOPNOTSUPP; } return error; } /* ----------------------------------------------------------------------------- called from dlil when a packet from the interface is to be dispatched to the specific network protocol attached by dl_tag. the network protocol has been determined earlier by the demux function. the packet is in the mbuf chain m without the frame header, which is provided separately. (not used) ----------------------------------------------------------------------------- */ errno_t ppp_ip_input(ifnet_t ifp, protocol_family_t protocol, mbuf_t packet, char* header) { LOGMBUF("ppp_ip_input", packet); if (ipflow_fastforward((struct mbuf *)packet)) { return 0; } proto_input(PF_INET, packet); return 0; } /* ----------------------------------------------------------------------------- pre_output function ----------------------------------------------------------------------------- */ errno_t ppp_ip_preoutput(ifnet_t ifp, protocol_family_t protocol, mbuf_t *packet, const struct sockaddr *dest, void *route, char *frame_type, char *link_layer_dest) { errno_t err; struct ppp_if *wan = (struct ppp_if *)ifnet_softc(ifp); LOGMBUF("ppp_ip_preoutput", *packet); lck_mtx_lock(ppp_domain_mutex); #if 0 (*packet)->m_flags &= ~M_HIGHPRI; /* If this packet has the "low delay" bit set in the IP header, set priority bit for the packet. */ ip = mtod(*packet, struct ip *); if (ip->ip_tos & IPTOS_LOWDELAY) (*packet)->m_flags |= M_HIGHPRI; #endif if ((wan->sc_flags & SC_LOOP_LOCAL) && (((struct sockaddr_in *)dest)->sin_addr.s_addr == wan->ip_src.s_addr) && wan->lo_ifp) { err = ifnet_output(wan->lo_ifp, PF_INET, *packet, 0, (struct sockaddr *)dest); lck_mtx_unlock(ppp_domain_mutex); return (err ? err : EJUSTRETURN); } lck_mtx_unlock(ppp_domain_mutex); *(u_int16_t *)frame_type = PPP_IP; return 0; } /* ----------------------------------------------------------------------------- Compare the source address of the packet with the source address of the interface ----------------------------------------------------------------------------- */ int ppp_ip_af_src_out(ifnet_t ifp, char *pkt) { struct ppp_if *wan = (struct ppp_if *)ifnet_softc(ifp); struct ip *ip; ip = (struct ip *)pkt; return (ip->ip_src.s_addr != wan->ip_src.s_addr); } /* ----------------------------------------------------------------------------- Compare the source address of the packet with the dst address of the interface ----------------------------------------------------------------------------- */ int ppp_ip_af_src_in(ifnet_t ifp, char *pkt) { struct ppp_if *wan = (struct ppp_if *)ifnet_softc(ifp); struct ip *ip; ip = (struct ip *)pkt; return (ip->ip_src.s_addr != wan->ip_dst.s_addr); }