pppd/plugins/pppoe/pppoe_server.c

   1 /* PPPoE support library "libpppoe"
   2  *
   3  * Copyright 2000 Michal Ostrowski <mostrows@styx.uwaterloo.ca>,
   4  *                Jamal Hadi Salim <hadi@cyberus.ca>
   5  *
   6  *  This program is free software; you can redistribute it and/or
   7  *  modify it under the terms of the GNU General Public License
   8  *  as published by the Free Software Foundation; either version
   9  *  2 of the License, or (at your option) any later version.
  10  */
  11 #include "pppoe.h"
  12 #include <unistd.h>
  13
  14 static unsigned int pcid=1111;
  15 static int srv_rcv_padi(struct session* ses,
  16                         struct pppoe_packet *p_in,
  17                         struct pppoe_packet **p_out){
  18     struct pppoe_con *newpc = NULL;
  19     struct pppoe_tag *tag;
  20
  21     poe_dbglog(ses,"Srv Recv'd packet: %P\n",p_in);
  22
  23
  24     ses->curr_pkt.hdr = (struct pppoe_hdr*) ses->curr_pkt.buf;
  25     ses->curr_pkt.hdr->ver  = 1;
  26     ses->curr_pkt.hdr->type = 1;
  27
  28     tag = get_tag(p_in->hdr,PTT_SRV_NAME);
  29
  30     if(!tag )
  31         return 0;
  32
  33     if( ntohs(tag->tag_len)==0 ){
  34         ses->curr_pkt.tags[TAG_SRV_NAME] = ses->filt->stag ;
  35     }else if( tag->tag_len != ses->filt->stag->tag_len
  36               || !memcmp( tag+1, ses->filt->stag, ntohs(tag->tag_len)) ){
  37         return 0;
  38     }else{
  39         ses->curr_pkt.tags[TAG_SRV_NAME] = tag;
  40     }
  41
  42     ses->curr_pkt.tags[ TAG_AC_NAME] = ses->filt->ntag ;
  43     ses->curr_pkt.tags[ TAG_HOST_UNIQ ] = get_tag(p_in->hdr,PTT_HOST_UNIQ);
  44
  45     memcpy(&ses->remote, &p_in->addr, sizeof(struct sockaddr_ll));
  46     memcpy( &ses->curr_pkt.addr, &ses->remote , sizeof(struct sockaddr_ll));
  47
  48     ses->curr_pkt.hdr->code =  PADO_CODE;
  49
  50
  51     ses->curr_pkt.tags[ TAG_RELAY_SID ] = get_tag(p_in->hdr,PTT_RELAY_SID);
  52
  53     send_disc(ses, &ses->curr_pkt);
  54     poe_dbglog(ses,"Srv Sent packet: %P\n",&ses->curr_pkt);
  55
  56     return 0;
  57 }
  58
  59
  60 static int srv_rcv_padr(struct session* ses,
  61                         struct pppoe_packet *p_in,
  62                         struct pppoe_packet **p_out){
  63     struct pppoe_tag *tag;
  64
  65     poe_dbglog(ses,"Recv'd packet: %P\n",p_in);
  66
  67
  68
  69     /* Run checks to ensure this packets asks for
  70        what we're willing to offer */
  71
  72     tag = get_tag(p_in->hdr,PTT_SRV_NAME);
  73
  74     if(!tag || tag->tag_len == 0 ){
  75         p_in->tags[TAG_SRV_NAME] = ses->filt->stag;
  76
  77     }else if( tag->tag_len != ses->filt->stag->tag_len
  78              || !memcmp(tag + 1 , ses->filt->stag, ntohs(tag->tag_len)) ){
  79         return 0;
  80     }else{
  81         p_in->tags[TAG_SRV_NAME] = tag;
  82     }
  83
  84     tag = get_tag(p_in->hdr,PTT_AC_NAME);
  85     if( !tag || tag->tag_len==0 ){
  86         p_in->tags[TAG_AC_NAME] = ses->filt->ntag;
  87     }else if( tag->tag_len != ses->filt->ntag->tag_len
  88           || !memcmp(tag + 1, ses->filt->ntag, ntohs(tag->tag_len)) ){
  89         return 0;
  90     }else{
  91         p_in->tags[TAG_AC_NAME] = tag;
  92     }
  93
  94
  95
  96
  97     pcid = ++pcid & 0x0000ffff ;
  98     if(pcid == 0 ){
  99         pcid = 1111;
 100     }
 101
 102     p_in->hdr->sid  = ntohs(pcid);
 103
 104     p_in->hdr->code = PADS_CODE;
 105     send_disc(ses, p_in);
 106
 107     poe_dbglog(ses,"Sent packet: %P\n",p_in);
 108
 109     ses->sp.sa_family = AF_PPPOX;
 110     ses->sp.sa_protocol=PX_PROTO_OE;
 111     ses->sp.sa_addr.pppoe.sid = p_in->hdr->sid;
 112     memcpy(ses->sp.sa_addr.pppoe.dev, ses->name, IFNAMSIZ);
 113     memcpy(ses->sp.sa_addr.pppoe.remote, p_in->addr.sll_addr, ETH_ALEN);
 114     memcpy(&ses->remote, &p_in->addr, sizeof(struct sockaddr_ll));
 115     return 1;
 116 }
 117
 118 static int srv_rcv_padt(struct session* ses,
 119                         struct pppoe_packet *p_in,
 120                         struct pppoe_packet **p_out){
 121     return 0;
 122 }
 123
 124
 125
 126 int srv_init_ses(struct session *ses, char* from)
 127 {
 128     int retval;
 129     retval = client_init_ses(ses, from);
 130     ses->init_disc = NULL;
 131     ses->rcv_pado  = NULL;
 132     ses->rcv_pads  = NULL;
 133     ses->rcv_padi  = srv_rcv_padi;
 134     ses->rcv_padr  = srv_rcv_padr;
 135     ses->rcv_padt  = srv_rcv_padt;
 136
 137     /* retries forever */
 138     ses->retries   = -1;
 139
 140     return retval;
 141 }
 142
 143