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/* $OpenBSD: pppoe_session.c,v 1.11 2015/12/05 16:10:31 yasuoka Exp $ */ |
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/*- |
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* Copyright (c) 2009 Internet Initiative Japan Inc. |
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* All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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*/ |
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/**@file |
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* Session management of PPPoE protocol |
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* $Id: pppoe_session.c,v 1.11 2015/12/05 16:10:31 yasuoka Exp $ |
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*/ |
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#include <sys/types.h> |
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#include <sys/socket.h> |
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#include <sys/uio.h> |
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#include <netinet/in.h> |
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#include <net/if.h> |
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#if defined(__NetBSD__) |
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#include <net/if_ether.h> |
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#else |
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#include <netinet/if_ether.h> |
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#endif |
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#include <net/if_dl.h> |
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#include <time.h> |
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#include <string.h> |
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#include <stdlib.h> |
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#include <stdio.h> |
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#include <event.h> |
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#include <syslog.h> |
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#include <stdarg.h> |
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#include "hash.h" |
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#include "slist.h" |
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#include "debugutil.h" |
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#include "bytebuf.h" |
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#include "pppoe.h" |
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#include "pppoe_local.h" |
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#include "npppd.h" |
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#include "ppp.h" |
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#ifdef PPPOE_SESSION_DEBUG |
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#define PPPOE_SESSION_ASSERT(x) ASSERT(x) |
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#define PPPOE_SESSION_DBG(x) pppoe_session_log x |
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#else |
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#define PPPOE_SESSION_ASSERT(x) |
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#define PPPOE_SESSION_DBG(x) |
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#endif |
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#define pppoed_listener_this(sess) \ |
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((pppoed_listener *)slist_get(&(sess)->pppoed->listener, \ |
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(sess)->listener_index)) |
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static void pppoe_session_log (pppoe_session *, int, const char *, ...) __printflike(3,4); |
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static int pppoe_session_send_PADS (pppoe_session *, struct pppoe_tlv *, |
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struct pppoe_tlv *); |
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static int pppoe_session_send_PADT (pppoe_session *); |
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static int pppoe_session_ppp_output (npppd_ppp *, u_char *, int, int); |
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static void pppoe_session_close_by_ppp(npppd_ppp *); |
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static int pppoe_session_bind_ppp (pppoe_session *); |
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static void pppoe_session_dispose_event(int, short, void *); |
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/* Initialize PPPoE session context */ |
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int |
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pppoe_session_init(pppoe_session *_this, pppoed *_pppoed, int idx, |
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int session_id, u_char *ether_addr) |
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{ |
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memset(_this, 0, sizeof(pppoe_session)); |
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_this->pppoed = _pppoed; |
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_this->session_id = session_id; |
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_this->listener_index = idx; |
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memcpy(_this->ether_addr, ether_addr, ETHER_ADDR_LEN); |
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memcpy(_this->ehdr.ether_dhost, ether_addr, ETHER_ADDR_LEN); |
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memcpy(_this->ehdr.ether_shost, pppoe_session_sock_ether_addr(_this), |
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ETHER_ADDR_LEN); |
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evtimer_set(&_this->ev_disposing, pppoe_session_dispose_event, _this); |
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return 0; |
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} |
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/* Disconnect PPPoE session */ |
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void |
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pppoe_session_disconnect(pppoe_session *_this) |
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{ |
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struct timeval tv; |
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if (_this->state != PPPOE_SESSION_STATE_DISPOSING) { |
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pppoe_session_send_PADT(_this); |
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/* free process should be par event */ |
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timerclear(&tv); |
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evtimer_add(&_this->ev_disposing, &tv); |
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_this->state = PPPOE_SESSION_STATE_DISPOSING; |
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} |
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if (_this->ppp != NULL) |
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ppp_phy_downed(_this->ppp); |
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} |
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/* Stop PPPoE session */ |
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void |
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pppoe_session_stop(pppoe_session *_this) |
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{ |
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if (_this->state != PPPOE_SESSION_STATE_DISPOSING) |
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pppoe_session_disconnect(_this); |
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} |
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/* Finish PPPoE session */ |
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void |
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pppoe_session_fini(pppoe_session *_this) |
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{ |
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evtimer_del(&_this->ev_disposing); |
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} |
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/* call back function from event(3) */ |
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static void |
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pppoe_session_dispose_event(int fd, short ev, void *ctx) |
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{ |
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pppoe_session *_this; |
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_this = ctx; |
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pppoed_pppoe_session_close_notify(_this->pppoed, _this); |
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} |
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/* |
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* I/O |
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*/ |
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void |
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pppoe_session_input(pppoe_session *_this, u_char *pkt, int lpkt) |
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{ |
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int rval; |
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npppd_ppp *ppp; |
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ppp = _this->ppp; |
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if (_this->ppp == NULL) |
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return; |
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if (_this->state != PPPOE_SESSION_STATE_RUNNING) |
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return; |
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rval = ppp->recv_packet(ppp, pkt, lpkt, 0); |
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if (_this->ppp == NULL) /* ppp is freed */ |
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return; |
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if (rval == 2) { |
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/* |
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* Quit this function before statistics counter |
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* is processed when the packet will be processed by |
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* PIPEX. Because current NPPPD PPPOE implementation |
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* is recieving all packet from BPF even though the |
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* PIPEX will process it. |
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*/ |
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} else if (rval != 0) { |
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ppp->ierrors++; |
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} else { |
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ppp->ipackets++; |
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ppp->ibytes += lpkt; |
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} |
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return; |
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} |
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static int |
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pppoe_session_output(pppoe_session *_this, int is_disc, u_char *pkt, |
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int lpkt) |
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{ |
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int sz, niov, tlen; |
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struct iovec iov[4]; |
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struct pppoe_header pppoe0, *pppoe; |
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char pad[ETHERMIN]; |
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niov = 0; |
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tlen = 0; |
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iov[niov].iov_base = &_this->ehdr; |
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iov[niov++].iov_len = sizeof(_this->ehdr); |
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if (is_disc) { |
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_this->ehdr.ether_type = htons(ETHERTYPE_PPPOEDISC); |
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iov[niov].iov_base = pkt; |
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iov[niov++].iov_len = lpkt; |
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pppoe = (struct pppoe_header *)pkt; |
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pppoe->length = htons(lpkt - sizeof(pppoe0)); |
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tlen += lpkt; |
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} else { |
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_this->ehdr.ether_type = htons(ETHERTYPE_PPPOE); |
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pppoe0.ver = PPPOE_RFC2516_VER; |
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pppoe0.type = PPPOE_RFC2516_TYPE; |
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pppoe0.code = 0; |
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pppoe0.session_id = htons(_this->session_id); |
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pppoe0.length = htons(lpkt); |
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iov[niov].iov_base = &pppoe0; |
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iov[niov++].iov_len = sizeof(pppoe0); |
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tlen += sizeof(pppoe0); |
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iov[niov].iov_base = pkt; |
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iov[niov++].iov_len = lpkt; |
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tlen += lpkt; |
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} |
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if (tlen < ETHERMIN) { |
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memset(pad, 0, ETHERMIN - tlen); |
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iov[niov].iov_base = pad; |
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iov[niov++].iov_len = ETHERMIN - tlen; |
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} |
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sz = writev(pppoe_session_sock_bpf(_this), iov, niov); |
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return (sz > 0)? 0 : -1; |
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} |
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static int |
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pppoe_session_send_PADT(pppoe_session *_this) |
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{ |
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u_char bufspace[2048]; |
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bytebuffer *buf; |
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struct pppoe_header pppoe; |
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int rval = 0; |
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struct pppoe_tlv tlv; |
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if ((buf = bytebuffer_wrap(bufspace, sizeof(bufspace))) == NULL) { |
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pppoe_session_log(_this, LOG_ERR, |
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"bytebuffer_wrap() failed on %s(): %m", __func__); |
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return -1; |
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} |
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bytebuffer_clear(buf); |
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/* |
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* PPPoE Header |
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*/ |
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memset(&pppoe, 0, sizeof(pppoe)); |
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pppoe.ver = PPPOE_RFC2516_VER; |
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pppoe.type = PPPOE_RFC2516_TYPE; |
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pppoe.code = PPPOE_CODE_PADT; |
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pppoe.session_id = htons(_this->session_id); |
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bytebuffer_put(buf, &pppoe, sizeof(pppoe)); |
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/* |
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* Tag - End-of-List |
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*/ |
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tlv.type = htons(PPPOE_TAG_END_OF_LIST); |
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tlv.length = 0; |
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bytebuffer_put(buf, &tlv, sizeof(tlv)); |
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tlv.type = htons(PPPOE_TAG_END_OF_LIST); |
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tlv.length = 0; |
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bytebuffer_put(buf, &tlv, sizeof(tlv)); |
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bytebuffer_flip(buf); |
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if (pppoe_session_output(_this, 1, bytebuffer_pointer(buf), |
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bytebuffer_remaining(buf)) != 0) { |
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pppoe_session_log(_this, LOG_ERR, "pppoed_output failed: %m"); |
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rval = 1; |
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} |
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pppoe_session_log(_this, LOG_INFO, "SendPADT"); |
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bytebuffer_unwrap(buf); |
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bytebuffer_destroy(buf); |
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return rval; |
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} |
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/* send PADS */ |
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static int |
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pppoe_session_send_PADS(pppoe_session *_this, struct pppoe_tlv *hostuniq, |
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struct pppoe_tlv *service_name) |
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{ |
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int rval, len; |
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u_char bufspace[2048], msgbuf[80]; |
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bytebuffer *buf; |
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struct pppoe_header pppoe; |
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struct pppoe_tlv tlv; |
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if ((buf = bytebuffer_wrap(bufspace, sizeof(bufspace))) == NULL) { |
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pppoe_session_log(_this, LOG_ERR, |
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"bytebuffer_wrap() failed on %s(): %m", __func__); |
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return -1; |
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} |
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bytebuffer_clear(buf); |
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/* |
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* PPPoE Header |
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*/ |
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memset(&pppoe, 0, sizeof(pppoe)); |
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pppoe.ver = PPPOE_RFC2516_VER; |
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pppoe.type = PPPOE_RFC2516_TYPE; |
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pppoe.code = PPPOE_CODE_PADS; |
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pppoe.session_id = htons(_this->session_id); |
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bytebuffer_put(buf, &pppoe, sizeof(pppoe)); |
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/* |
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* Tag - Service-Name |
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*/ |
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msgbuf[0] = '\0'; |
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if (service_name != NULL) { |
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tlv.type = htons(PPPOE_TAG_SERVICE_NAME); |
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tlv.length = htons(service_name->length); |
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bytebuffer_put(buf, &tlv, sizeof(tlv)); |
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len = service_name->length; |
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if (len > 0) { |
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bytebuffer_put(buf, service_name->value, len); |
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strlcpy(msgbuf, service_name->value, |
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MINIMUM(len + 1, sizeof(msgbuf))); |
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} |
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} |
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/* |
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* Tag - Host-Uniq |
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*/ |
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if (hostuniq != NULL) { |
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tlv.type = htons(PPPOE_TAG_HOST_UNIQ); |
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tlv.length = htons(hostuniq->length); |
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bytebuffer_put(buf, &tlv, sizeof(tlv)); |
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bytebuffer_put(buf, hostuniq->value, hostuniq->length); |
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} |
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tlv.type = htons(PPPOE_TAG_END_OF_LIST); |
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tlv.length = 0; |
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bytebuffer_put(buf, &tlv, sizeof(tlv)); |
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bytebuffer_flip(buf); |
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rval = 0; |
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if (pppoe_session_output(_this, 1, bytebuffer_pointer(buf), |
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bytebuffer_remaining(buf)) != 0) { |
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pppoe_session_log(_this, LOG_ERR, "pppoed_output failed: %m"); |
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rval = 1; |
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} |
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pppoe_session_log(_this, LOG_INFO, "SendPADS serviceName=%s " |
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"hostUniq=%s", msgbuf, |
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hostuniq? pppoed_tlv_value_string(hostuniq) : "none"); |
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bytebuffer_unwrap(buf); |
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bytebuffer_destroy(buf); |
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return rval; |
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} |
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/* process PADR from the peer */ |
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int |
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pppoe_session_recv_PADR(pppoe_session *_this, slist *tag_list) |
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{ |
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pppoed *pppoed0 = _this->pppoed; |
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struct pppoe_tlv *tlv, *hostuniq, *service_name, *ac_cookie; |
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service_name = NULL; |
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hostuniq = NULL; |
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ac_cookie = NULL; |
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for (slist_itr_first(tag_list); slist_itr_has_next(tag_list); ) { |
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tlv = slist_itr_next(tag_list); |
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if (tlv->type == PPPOE_TAG_HOST_UNIQ) |
372 |
|
|
hostuniq = tlv; |
373 |
|
|
if (tlv->type == PPPOE_TAG_SERVICE_NAME) |
374 |
|
|
service_name = tlv; |
375 |
|
|
if (tlv->type == PPPOE_TAG_AC_COOKIE) |
376 |
|
|
ac_cookie = tlv; |
377 |
|
|
} |
378 |
|
|
|
379 |
|
|
if (ac_cookie) { |
380 |
|
|
/* avoid a session which has already has cookie. */ |
381 |
|
|
if (hash_lookup(pppoed0->acookie_hash, |
382 |
|
|
(void *)ac_cookie->value) != NULL) |
383 |
|
|
goto fail; |
384 |
|
|
|
385 |
|
|
_this->acookie = *(uint32_t *)(ac_cookie->value); |
386 |
|
|
hash_insert(pppoed0->acookie_hash, |
387 |
|
|
(void *)(intptr_t)_this->acookie, _this); |
388 |
|
|
} |
389 |
|
|
|
390 |
|
|
if (pppoe_session_send_PADS(_this, hostuniq, service_name) != 0) |
391 |
|
|
goto fail; |
392 |
|
|
|
393 |
|
|
if (pppoe_session_bind_ppp(_this) != 0) |
394 |
|
|
goto fail; |
395 |
|
|
|
396 |
|
|
_this->state = PPPOE_SESSION_STATE_RUNNING; |
397 |
|
|
return 0; |
398 |
|
|
fail: |
399 |
|
|
return -1; |
400 |
|
|
} |
401 |
|
|
|
402 |
|
|
/* process PADT from the peer */ |
403 |
|
|
int |
404 |
|
|
pppoe_session_recv_PADT(pppoe_session *_this, slist *tag_list) |
405 |
|
|
{ |
406 |
|
|
pppoe_session_log(_this, LOG_INFO, "RecvPADT"); |
407 |
|
|
|
408 |
|
|
pppoe_session_stop(_this); |
409 |
|
|
_this->state = PPPOE_SESSION_STATE_DISPOSING; |
410 |
|
|
|
411 |
|
|
return 0; |
412 |
|
|
} |
413 |
|
|
|
414 |
|
|
/* |
415 |
|
|
* Log |
416 |
|
|
*/ |
417 |
|
|
static void |
418 |
|
|
pppoe_session_log(pppoe_session *_this, int prio, const char *fmt, ...) |
419 |
|
|
{ |
420 |
|
|
char logbuf[BUFSIZ]; |
421 |
|
|
va_list ap; |
422 |
|
|
|
423 |
|
|
PPPOE_SESSION_ASSERT(_this != NULL); |
424 |
|
|
va_start(ap, fmt); |
425 |
|
|
#ifdef PPPOED_MULTIPLE |
426 |
|
|
snprintf(logbuf, sizeof(logbuf), "pppoed id=%u session=%d %s", |
427 |
|
|
_this->pppoed->id, _this->session_id, fmt); |
428 |
|
|
#else |
429 |
|
|
snprintf(logbuf, sizeof(logbuf), "pppoed if=%s session=%d %s", |
430 |
|
|
pppoe_session_listen_ifname(_this), _this->session_id, fmt); |
431 |
|
|
#endif |
432 |
|
|
vlog_printf(prio, logbuf, ap); |
433 |
|
|
va_end(ap); |
434 |
|
|
} |
435 |
|
|
|
436 |
|
|
/* |
437 |
|
|
* PPP |
438 |
|
|
*/ |
439 |
|
|
static int |
440 |
|
|
pppoe_session_ppp_output(npppd_ppp *ppp, u_char *pkt, int lpkt, int flag) |
441 |
|
|
{ |
442 |
|
|
int rval; |
443 |
|
|
pppoe_session *_this; |
444 |
|
|
|
445 |
|
|
_this = ppp->phy_context; |
446 |
|
|
|
447 |
|
|
rval = pppoe_session_output(_this, 0, pkt, lpkt); |
448 |
|
|
|
449 |
|
|
if (_this->ppp == NULL) /* ppp is freed */ |
450 |
|
|
return 0; |
451 |
|
|
|
452 |
|
|
if (rval != 0) { |
453 |
|
|
ppp->oerrors++; |
454 |
|
|
} else { |
455 |
|
|
ppp->opackets++; |
456 |
|
|
ppp->obytes += lpkt; |
457 |
|
|
} |
458 |
|
|
|
459 |
|
|
return 0; |
460 |
|
|
} |
461 |
|
|
|
462 |
|
|
static void |
463 |
|
|
pppoe_session_close_by_ppp(npppd_ppp *ppp) |
464 |
|
|
{ |
465 |
|
|
pppoe_session *_this; |
466 |
|
|
|
467 |
|
|
_this = ppp->phy_context; |
468 |
|
|
PPPOE_SESSION_ASSERT(_this != NULL); |
469 |
|
|
if (_this != NULL) |
470 |
|
|
/* do this before pptp_call_disconnect() */ |
471 |
|
|
_this->ppp = NULL; |
472 |
|
|
|
473 |
|
|
pppoe_session_disconnect(_this); |
474 |
|
|
} |
475 |
|
|
|
476 |
|
|
/* bind for PPP */ |
477 |
|
|
static int |
478 |
|
|
pppoe_session_bind_ppp(pppoe_session *_this) |
479 |
|
|
{ |
480 |
|
|
int len; |
481 |
|
|
npppd_ppp *ppp; |
482 |
|
|
struct sockaddr_dl sdl; |
483 |
|
|
|
484 |
|
|
ppp = NULL; |
485 |
|
|
if ((ppp = ppp_create()) == NULL) |
486 |
|
|
goto fail; |
487 |
|
|
|
488 |
|
|
PPPOE_SESSION_ASSERT(_this->ppp == NULL); |
489 |
|
|
|
490 |
|
|
if (_this->ppp != NULL) |
491 |
|
|
return -1; |
492 |
|
|
|
493 |
|
|
_this->ppp = ppp; |
494 |
|
|
|
495 |
|
|
ppp->tunnel_type = NPPPD_TUNNEL_PPPOE; |
496 |
|
|
ppp->tunnel_session_id = _this->session_id; |
497 |
|
|
ppp->phy_context = _this; |
498 |
|
|
ppp->send_packet = pppoe_session_ppp_output; |
499 |
|
|
ppp->phy_close = pppoe_session_close_by_ppp; |
500 |
|
|
|
501 |
|
|
strlcpy(ppp->phy_label, PPPOE_SESSION_LISTENER_TUN_NAME(_this), |
502 |
|
|
sizeof(ppp->phy_label)); |
503 |
|
|
|
504 |
|
|
memset(&sdl, 0, sizeof(sdl)); |
505 |
|
|
sdl.sdl_len = sizeof(sdl); |
506 |
|
|
sdl.sdl_family = AF_LINK; |
507 |
|
|
sdl.sdl_index = if_nametoindex(pppoe_session_listen_ifname(_this)); |
508 |
|
|
len = strlen(pppoe_session_listen_ifname(_this)); |
509 |
|
|
memcpy(sdl.sdl_data, pppoe_session_listen_ifname(_this), len); |
510 |
|
|
sdl.sdl_nlen = len; |
511 |
|
|
sdl.sdl_alen = ETHER_ADDR_LEN; |
512 |
|
|
memcpy(sdl.sdl_data + len, _this->ether_addr, ETHER_ADDR_LEN); |
513 |
|
|
|
514 |
|
|
memcpy(&ppp->phy_info.peer_dl, &sdl, sizeof(sdl)); |
515 |
|
|
|
516 |
|
|
if (ppp_init(npppd_get_npppd(), ppp) != 0) |
517 |
|
|
goto fail; |
518 |
|
|
ppp->has_acf = 0; |
519 |
|
|
|
520 |
|
|
|
521 |
|
|
pppoe_session_log(_this, LOG_NOTICE, "logtype=PPPBind ppp=%d", ppp->id); |
522 |
|
|
ppp_start(ppp); |
523 |
|
|
|
524 |
|
|
return 0; |
525 |
|
|
fail: |
526 |
|
|
pppoe_session_log(_this, LOG_ERR, "failed binding ppp"); |
527 |
|
|
|
528 |
|
|
if (ppp != NULL) |
529 |
|
|
ppp_destroy(ppp); |
530 |
|
|
_this->ppp = NULL; |
531 |
|
|
|
532 |
|
|
return 1; |
533 |
|
|
} |