--- /dev/null
+/* PPPoE support library "libpppoe"
+ *
+ * Copyright 2000 Michal Ostrowski <mostrows@styx.uwaterloo.ca>,
+ * Jamal Hadi Salim <hadi@cyberus.ca>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include "pppoe.h"
+
+static int relay_init_disc(struct session* ses,
+ struct pppoe_packet *p_in,
+ struct pppoe_packet **p_out){
+
+ ses->state = 0;
+ ses->retransmits = -1 ;
+ ses->retries = -1;
+
+ (*p_out) = NULL;
+ return 0;
+}
+
+static int pcid=0;
+static int relay_rcv_padi(struct session* ses,
+ struct pppoe_packet *p_in,
+ struct pppoe_packet **p_out){
+ char tag_buf[32];
+ struct pppoe_con *newpc = NULL;
+ struct pppoe_tag *tag = (struct pppoe_tag *) tag_buf;
+
+
+ tag->tag_type = PTT_RELAY_SID;
+ tag->tag_len = htons(ETH_ALEN + sizeof(struct session *));
+
+ memcpy(tag->tag_data, p_in->addr.sll_addr, ETH_ALEN);
+ memcpy(tag->tag_data + ETH_ALEN, &ses, sizeof(struct session *));
+
+ if(! p_in->tags[TAG_RELAY_SID] ){
+ copy_tag(p_in, tag);
+ }
+
+
+ poe_dbglog(ses, "Recv'd PADI: %P",p_in);
+ poe_dbglog(ses, "Recv'd packet: %P",p_in);
+ newpc = get_con( ntohs(tag->tag_len), tag->tag_data );
+ if(!newpc){
+
+ newpc = (struct pppoe_con *) malloc(sizeof(struct pppoe_con));
+ memset(newpc , 0, sizeof(struct pppoe_con));
+
+ newpc->id = pcid++;
+
+ newpc->key_len = ntohs(p_in->tags[TAG_RELAY_SID]->tag_len);
+ memcpy(newpc->key, p_in->tags[TAG_RELAY_SID]->tag_data, newpc->key_len);
+ memcpy(newpc->client, p_in->addr.sll_addr, ETH_ALEN);
+
+ memcpy(newpc->server, MAC_BCAST_ADDR, ETH_ALEN);
+
+ store_con(newpc);
+
+ }
+
+ ++newpc->ref_count;
+
+ memset(p_in->addr.sll_addr, 0xff, ETH_ALEN);
+
+ p_in->addr.sll_ifindex = ses->remote.sll_ifindex;
+
+ send_disc(ses, p_in);
+ return 0;
+}
+
+static int relay_rcv_pkt(struct session* ses,
+ struct pppoe_packet *p_in,
+ struct pppoe_packet **p_out){
+ struct pppoe_con *pc;
+ char tag_buf[32];
+ struct pppoe_tag *tag = p_in->tags[TAG_RELAY_SID];
+
+ if( !tag ) return 0;
+
+ pc = get_con(ntohs(tag->tag_len),tag->tag_data);
+
+ if( !pc ) return 0;
+
+ poe_dbglog(ses, "Recv'd packet: %P",p_in);
+
+ if( memcmp(pc->client , p_in->addr.sll_addr , ETH_ALEN ) == 0 ){
+
+ memcpy(p_in->addr.sll_addr, pc->server, ETH_ALEN);
+ p_in->addr.sll_ifindex = ses->remote.sll_ifindex;
+
+ }else{
+ if( memcmp(pc->server, MAC_BCAST_ADDR, ETH_ALEN) == 0 ){
+ memcpy(pc->server, p_in->addr.sll_addr, ETH_ALEN);
+
+ }else if( memcmp(pc->server, p_in->addr.sll_addr, ETH_ALEN) !=0){
+ return 0;
+ }
+
+ memcpy(p_in->addr.sll_addr, pc->client, ETH_ALEN);
+ p_in->addr.sll_ifindex = ses->local.sll_ifindex;
+
+
+ }
+
+
+ send_disc(ses, p_in);
+ return 0;
+}
+
+static int relay_rcv_pads(struct session* ses,
+ struct pppoe_packet *p_in,
+ struct pppoe_packet **p_out){
+
+ struct pppoe_con *pc;
+ char tag_buf[32];
+ struct pppoe_tag *tag = p_in->tags[TAG_RELAY_SID];
+ struct sockaddr_pppox sp_cl= { AF_PPPOX, PX_PROTO_OE,
+ { p_in->hdr->sid, {0,},{0,}}};
+
+ struct sockaddr_pppox sp_sv= { AF_PPPOX, PX_PROTO_OE,
+ { p_in->hdr->sid, {0,},{0,}}};
+
+ int ret;
+
+
+ if( !tag ) return 0;
+
+ pc = get_con(ntohs(tag->tag_len),tag->tag_data);
+
+ if( !pc ) return 0;
+
+
+ if(!pc->connected){
+
+ pc->sv_sock = socket( AF_PPPOX, SOCK_DGRAM, PX_PROTO_OE);
+ if( pc->sv_sock < 0){
+ poe_fatal(ses,"Cannot open PPPoE socket: %i",errno);
+ }
+
+ pc->cl_sock = socket( AF_PPPOX, SOCK_DGRAM, PX_PROTO_OE);
+ if( pc->cl_sock < 0){
+ poe_fatal(ses,"Cannot open PPPoE socket: %i",errno);
+ }
+
+ memcpy( sp_sv.sa_addr.pppoe.dev, ses->fwd_name, IFNAMSIZ);
+ memcpy( sp_sv.sa_addr.pppoe.remote, pc->server, ETH_ALEN);
+
+ ret = connect( pc->sv_sock,
+ (struct sockaddr*)&sp_sv,
+ sizeof(struct sockaddr_pppox));
+ if( ret < 0){
+ poe_fatal(ses,"Cannot connect PPPoE socket: %i",errno);
+ }
+
+ memcpy( sp_cl.sa_addr.pppoe.dev, ses->name, IFNAMSIZ);
+ memcpy( sp_cl.sa_addr.pppoe.remote, pc->client, ETH_ALEN);
+
+ ret = connect( pc->cl_sock,
+ (struct sockaddr*)&sp_cl,
+ sizeof(struct sockaddr_pppox));
+ if( ret < 0){
+ poe_fatal(ses,"Cannot connect PPPoE socket: %i",errno);
+ }
+
+
+ ret = ioctl( pc->sv_sock, PPPOEIOCSFWD, &sp_cl);
+ if( ret < 0){
+ poe_fatal(ses,"Cannot set forwarding on PPPoE socket: %i",errno);
+ }
+
+ ret = ioctl( pc->cl_sock, PPPOEIOCSFWD, &sp_sv);
+ if( ret < 0){
+ poe_fatal(ses,"Cannot set forwarding on PPPoE socket: %i",errno);
+ }
+
+ pc->connected = 1;
+ }
+
+ poe_info(ses,"PPPoE relay for %E established to %E (sid=%04x)\n",
+ pc->client,pc->server, p_in->hdr->sid);
+
+ return relay_rcv_pkt(ses,p_in,p_out);
+}
+
+
+static int relay_rcv_padt(struct session* ses,
+ struct pppoe_packet *p_in,
+ struct pppoe_packet **p_out){
+
+ int ret;
+ struct pppoe_con *pc;
+ char tag_buf[32];
+ struct pppoe_tag *tag = p_in->tags[TAG_RELAY_SID];
+
+ if( !tag ) return 0;
+
+ pc = get_con(ntohs(tag->tag_len),tag->tag_data);
+
+ if( !pc ) return 0;
+
+ ret = relay_rcv_pkt(ses,p_in,p_out);
+
+
+ if(pc->cl_sock>0){
+ close(pc->cl_sock);
+ }
+
+ if(pc->sv_sock>0){
+ close(pc->sv_sock);
+ }
+
+ --pc->ref_count;
+ if( pc->ref_count == 0 ){
+ delete_con(pc->key_len, pc->key);
+
+ free(pc);
+ }
+}
+
+
+int relay_init_ses(struct session *ses, char* from, char* to)
+{
+ int retval = client_init_ses(ses, from);
+
+ if(retval<0) return retval;
+
+ ses->fwd_sock = socket(PF_PACKET, SOCK_DGRAM, 0);
+ if( ses->fwd_sock < 0 ) {
+ poe_fatal(ses,"Cannot create PF_PACKET socket for PPPoE forwarding\n");
+ }
+
+ /* Verify the device name , construct ses->local */
+ retval = get_sockaddr_ll(to, &ses->remote);
+ if (retval < 0)
+ poe_fatal(ses,"relay_init_ses:get_sockaddr_ll failed %m");
+
+ retval = bind( ses->fwd_sock ,
+ (struct sockaddr*)&ses->remote,
+ sizeof(struct sockaddr_ll));
+
+ if( retval < 0 ){
+ poe_fatal(ses,"bind to PF_PACKET socket failed: %m");
+ }
+
+ memcpy(ses->fwd_name, to, IFNAMSIZ);
+ memcpy(ses->name, from, IFNAMSIZ);
+
+
+ ses->init_disc = relay_init_disc;
+ ses->rcv_padi = relay_rcv_padi;
+ ses->rcv_pado = relay_rcv_pkt;
+ ses->rcv_padr = relay_rcv_pkt;
+ ses->rcv_pads = relay_rcv_pads;
+ ses->rcv_padt = relay_rcv_padt;
+}
projects / ppp.git / blobdiff