1768 lines
46 KiB
C
1768 lines
46 KiB
C
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/*
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* ng_pppoe.c
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*
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* Copyright (c) 1996-1999 Whistle Communications, Inc.
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* All rights reserved.
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*
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* Subject to the following obligations and disclaimer of warranty, use and
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* redistribution of this software, in source or object code forms, with or
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* without modifications are expressly permitted by Whistle Communications;
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* provided, however, that:
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* 1. Any and all reproductions of the source or object code must include the
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* copyright notice above and the following disclaimer of warranties; and
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* 2. No rights are granted, in any manner or form, to use Whistle
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* Communications, Inc. trademarks, including the mark "WHISTLE
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* COMMUNICATIONS" on advertising, endorsements, or otherwise except as
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* such appears in the above copyright notice or in the software.
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*
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* THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
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* TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
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* REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
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* INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
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* WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
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* REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
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* SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
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* IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
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* RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
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* WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
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* PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*
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* Author: Julian Elischer <julian@freebsd.org>
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*
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* $FreeBSD$
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* $Whistle: ng_pppoe.c,v 1.10 1999/11/01 09:24:52 julian Exp $
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*/
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#if 0
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#define AAA printf("pppoe: %s\n", __func__ );
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#define BBB printf("-%d-", __LINE__ );
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#else
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#define AAA
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#define BBB
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#endif
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/mbuf.h>
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#include <sys/malloc.h>
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#include <sys/errno.h>
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#include <sys/sysctl.h>
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#include <sys/syslog.h>
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#include <net/ethernet.h>
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#include <netgraph/ng_message.h>
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#include <netgraph/netgraph.h>
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#include <netgraph/ng_parse.h>
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#include <netgraph/ng_pppoe.h>
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#ifdef NG_SEPARATE_MALLOC
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MALLOC_DEFINE(M_NETGRAPH_PPPOE, "netgraph_pppoe", "netgraph pppoe node");
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#else
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#define M_NETGRAPH_PPPOE M_NETGRAPH
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#endif
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#define SIGNOFF "session closed"
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#define OFFSETOF(s, e) ((char *)&((s *)0)->e - (char *)((s *)0))
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/*
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* This section contains the netgraph method declarations for the
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* pppoe node. These methods define the netgraph pppoe 'type'.
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*/
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static ng_constructor_t ng_pppoe_constructor;
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static ng_rcvmsg_t ng_pppoe_rcvmsg;
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static ng_shutdown_t ng_pppoe_shutdown;
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static ng_newhook_t ng_pppoe_newhook;
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static ng_connect_t ng_pppoe_connect;
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static ng_rcvdata_t ng_pppoe_rcvdata;
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static ng_disconnect_t ng_pppoe_disconnect;
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/* Parse type for struct ngpppoe_init_data */
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static const struct ng_parse_struct_field ngpppoe_init_data_type_fields[]
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= NG_PPPOE_INIT_DATA_TYPE_INFO;
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static const struct ng_parse_type ngpppoe_init_data_state_type = {
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&ng_parse_struct_type,
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&ngpppoe_init_data_type_fields
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};
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/* Parse type for struct ngpppoe_sts */
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static const struct ng_parse_struct_field ng_pppoe_sts_type_fields[]
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= NG_PPPOE_STS_TYPE_INFO;
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static const struct ng_parse_type ng_pppoe_sts_state_type = {
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&ng_parse_struct_type,
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&ng_pppoe_sts_type_fields
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};
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/* List of commands and how to convert arguments to/from ASCII */
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static const struct ng_cmdlist ng_pppoe_cmds[] = {
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{
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NGM_PPPOE_COOKIE,
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NGM_PPPOE_CONNECT,
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"pppoe_connect",
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&ngpppoe_init_data_state_type,
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NULL
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},
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{
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NGM_PPPOE_COOKIE,
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NGM_PPPOE_LISTEN,
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"pppoe_listen",
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&ngpppoe_init_data_state_type,
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NULL
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},
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{
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NGM_PPPOE_COOKIE,
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NGM_PPPOE_OFFER,
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"pppoe_offer",
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&ngpppoe_init_data_state_type,
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NULL
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},
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{
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NGM_PPPOE_COOKIE,
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NGM_PPPOE_SERVICE,
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"pppoe_service",
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&ngpppoe_init_data_state_type,
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NULL
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},
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{
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NGM_PPPOE_COOKIE,
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NGM_PPPOE_SUCCESS,
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"pppoe_success",
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&ng_pppoe_sts_state_type,
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NULL
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},
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{
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NGM_PPPOE_COOKIE,
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NGM_PPPOE_FAIL,
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"pppoe_fail",
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&ng_pppoe_sts_state_type,
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NULL
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},
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{
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NGM_PPPOE_COOKIE,
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NGM_PPPOE_CLOSE,
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"pppoe_close",
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&ng_pppoe_sts_state_type,
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NULL
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},
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{ 0 }
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};
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/* Netgraph node type descriptor */
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static struct ng_type typestruct = {
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.version = NG_ABI_VERSION,
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.name = NG_PPPOE_NODE_TYPE,
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.constructor = ng_pppoe_constructor,
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.rcvmsg = ng_pppoe_rcvmsg,
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.shutdown = ng_pppoe_shutdown,
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.newhook = ng_pppoe_newhook,
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.connect = ng_pppoe_connect,
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.rcvdata = ng_pppoe_rcvdata,
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.disconnect = ng_pppoe_disconnect,
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.cmdlist = ng_pppoe_cmds,
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};
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NETGRAPH_INIT(pppoe, &typestruct);
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/* Depend on ng_ether so we can use the Ethernet parse type */
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MODULE_DEPEND(ng_pppoe, ng_ether, 1, 1, 1);
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/*
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* States for the session state machine.
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* These have no meaning if there is no hook attached yet.
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*/
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enum state {
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PPPOE_SNONE=0, /* [both] Initial state */
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PPPOE_LISTENING, /* [Daemon] Listening for discover initiation pkt */
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PPPOE_SINIT, /* [Client] Sent discovery initiation */
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PPPOE_PRIMED, /* [Server] Awaiting PADI from daemon */
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PPPOE_SOFFER, /* [Server] Sent offer message (got PADI)*/
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PPPOE_SREQ, /* [Client] Sent a Request */
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PPPOE_NEWCONNECTED, /* [Server] Connection established, No data received */
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PPPOE_CONNECTED, /* [Both] Connection established, Data received */
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PPPOE_DEAD /* [Both] */
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};
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#define NUMTAGS 20 /* number of tags we are set up to work with */
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/*
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* Information we store for each hook on each node for negotiating the
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* session. The mbuf and cluster are freed once negotiation has completed.
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* The whole negotiation block is then discarded.
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*/
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struct sess_neg {
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struct mbuf *m; /* holds cluster with last sent packet */
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union packet *pkt; /* points within the above cluster */
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struct callout_handle timeout_handle; /* see timeout(9) */
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u_int timeout; /* 0,1,2,4,8,16 etc. seconds */
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u_int numtags;
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const struct pppoe_tag *tags[NUMTAGS];
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u_int service_len;
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u_int ac_name_len;
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struct datatag service;
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struct datatag ac_name;
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};
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typedef struct sess_neg *negp;
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/*
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* Session information that is needed after connection.
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*/
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struct sess_con {
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hook_p hook;
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u_int16_t Session_ID;
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enum state state;
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ng_ID_t creator; /* who to notify */
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struct pppoe_full_hdr pkt_hdr; /* used when connected */
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negp neg; /* used when negotiating */
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/*struct sess_con *hash_next;*/ /* not yet used */
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};
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typedef struct sess_con *sessp;
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/*
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* Information we store for each node
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*/
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struct PPPOE {
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node_p node; /* back pointer to node */
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hook_p ethernet_hook;
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hook_p debug_hook;
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u_int packets_in; /* packets in from ethernet */
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u_int packets_out; /* packets out towards ethernet */
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u_int32_t flags;
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/*struct sess_con *buckets[HASH_SIZE];*/ /* not yet used */
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};
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typedef struct PPPOE *priv_p;
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struct ether_header eh_prototype =
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{{0xff,0xff,0xff,0xff,0xff,0xff},
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{0x00,0x00,0x00,0x00,0x00,0x00},
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ETHERTYPE_PPPOE_DISC};
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#define PPPOE_KEEPSTANDARD -1 /* never switch to nonstandard mode */
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#define PPPOE_STANDARD 0 /* try standard mode (dangerous!) */
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#define PPPOE_NONSTANDARD 1 /* just be in nonstandard mode */
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static int pppoe_mode = PPPOE_KEEPSTANDARD;
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static int
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ngpppoe_set_ethertype(SYSCTL_HANDLER_ARGS)
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{
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int error;
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int val;
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val = pppoe_mode;
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error = sysctl_handle_int(oidp, &val, sizeof(int), req);
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if (error != 0 || req->newptr == NULL)
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return (error);
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switch (val) {
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case PPPOE_NONSTANDARD:
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pppoe_mode = PPPOE_NONSTANDARD;
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eh_prototype.ether_type = ETHERTYPE_PPPOE_STUPID_DISC;
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break;
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case PPPOE_STANDARD:
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pppoe_mode = PPPOE_STANDARD;
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eh_prototype.ether_type = ETHERTYPE_PPPOE_DISC;
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break;
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case PPPOE_KEEPSTANDARD:
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pppoe_mode = PPPOE_KEEPSTANDARD;
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eh_prototype.ether_type = ETHERTYPE_PPPOE_DISC;
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break;
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default:
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return (EINVAL);
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}
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return (0);
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}
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SYSCTL_PROC(_net_graph, OID_AUTO, nonstandard_pppoe, CTLTYPE_INT | CTLFLAG_RW,
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0, sizeof(int), ngpppoe_set_ethertype, "I", "select normal or stupid ISP");
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union uniq {
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char bytes[sizeof(void *)];
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void * pointer;
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};
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#define LEAVE(x) do { error = x; goto quit; } while(0)
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static void pppoe_start(sessp sp);
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static void sendpacket(sessp sp);
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static void pppoe_ticker(void *arg);
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static const struct pppoe_tag *scan_tags(sessp sp,
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const struct pppoe_hdr* ph);
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static int pppoe_send_event(sessp sp, enum cmd cmdid);
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/*************************************************************************
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* Some basic utilities from the Linux version with author's permission.*
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* Author: Michal Ostrowski <mostrows@styx.uwaterloo.ca> *
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************************************************************************/
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/*
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* Generate a new session id
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* XXX find out the FreeBSD locking scheme.
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*/
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static u_int16_t
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get_new_sid(node_p node)
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{
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static int pppoe_sid = 10;
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sessp sp;
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hook_p hook;
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u_int16_t val;
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priv_p privp = NG_NODE_PRIVATE(node);
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AAA
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restart:
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val = pppoe_sid++;
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/*
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* Spec says 0xFFFF is reserved.
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* Also don't use 0x0000
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*/
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if (val == 0xffff) {
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pppoe_sid = 20;
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goto restart;
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}
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/* Check it isn't already in use */
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LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) {
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/* don't check special hooks */
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if ((NG_HOOK_PRIVATE(hook) == &privp->debug_hook)
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|| (NG_HOOK_PRIVATE(hook) == &privp->ethernet_hook))
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continue;
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sp = NG_HOOK_PRIVATE(hook);
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if (sp->Session_ID == val)
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goto restart;
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}
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return val;
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}
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/*
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* Return the location where the next tag can be put
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*/
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static __inline const struct pppoe_tag*
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next_tag(const struct pppoe_hdr* ph)
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{
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return (const struct pppoe_tag*)(((const char*)&ph->tag[0])
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+ ntohs(ph->length));
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}
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/*
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* Look for a tag of a specific type
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* Don't trust any length the other end says.
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* but assume we already sanity checked ph->length.
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*/
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static const struct pppoe_tag*
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get_tag(const struct pppoe_hdr* ph, u_int16_t idx)
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{
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const char *const end = (const char *)next_tag(ph);
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const char *ptn;
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const struct pppoe_tag *pt = &ph->tag[0];
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/*
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* Keep processing tags while a tag header will still fit.
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*/
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AAA
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while((const char*)(pt + 1) <= end) {
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/*
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* If the tag data would go past the end of the packet, abort.
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*/
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ptn = (((const char *)(pt + 1)) + ntohs(pt->tag_len));
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if(ptn > end)
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return NULL;
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if(pt->tag_type == idx)
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return pt;
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pt = (const struct pppoe_tag*)ptn;
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}
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return NULL;
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}
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/**************************************************************************
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* inlines to initialise or add tags to a session's tag list,
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**************************************************************************/
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/*
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* Initialise the session's tag list
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*/
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static void
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init_tags(sessp sp)
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{
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AAA
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if(sp->neg == NULL) {
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printf("pppoe: asked to init NULL neg pointer\n");
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return;
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}
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sp->neg->numtags = 0;
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}
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static void
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insert_tag(sessp sp, const struct pppoe_tag *tp)
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{
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int i;
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negp neg;
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AAA
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if((neg = sp->neg) == NULL) {
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printf("pppoe: asked to use NULL neg pointer\n");
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return;
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}
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if ((i = neg->numtags++) < NUMTAGS) {
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neg->tags[i] = tp;
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} else {
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printf("pppoe: asked to add too many tags to packet\n");
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neg->numtags--;
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}
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}
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/*
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* Make up a packet, using the tags filled out for the session.
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*
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* Assume that the actual pppoe header and ethernet header
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* are filled out externally to this routine.
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* Also assume that neg->wh points to the correct
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* location at the front of the buffer space.
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*/
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static void
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make_packet(sessp sp) {
|
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struct pppoe_full_hdr *wh = &sp->neg->pkt->pkt_header;
|
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const struct pppoe_tag **tag;
|
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char *dp;
|
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int count;
|
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int tlen;
|
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u_int16_t length = 0;
|
|
|
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AAA
|
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if ((sp->neg == NULL) || (sp->neg->m == NULL)) {
|
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printf("pppoe: make_packet called from wrong state\n");
|
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}
|
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dp = (char *)wh->ph.tag;
|
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for (count = 0, tag = sp->neg->tags;
|
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((count < sp->neg->numtags) && (count < NUMTAGS));
|
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tag++, count++) {
|
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tlen = ntohs((*tag)->tag_len) + sizeof(**tag);
|
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if ((length + tlen) > (ETHER_MAX_LEN - 4 - sizeof(*wh))) {
|
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printf("pppoe: tags too long\n");
|
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sp->neg->numtags = count;
|
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break; /* XXX chop off what's too long */
|
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}
|
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bcopy(*tag, (char *)dp, tlen);
|
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length += tlen;
|
|
dp += tlen;
|
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}
|
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wh->ph.length = htons(length);
|
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sp->neg->m->m_len = length + sizeof(*wh);
|
|
sp->neg->m->m_pkthdr.len = length + sizeof(*wh);
|
|
}
|
|
|
|
/**************************************************************************
|
|
* Routine to match a service offered *
|
|
**************************************************************************/
|
|
/*
|
|
* Find a hook that has a service string that matches that
|
|
* we are seeking. for now use a simple string.
|
|
* In the future we may need something like regexp().
|
|
* for testing allow a null string to match 1st found and a null service
|
|
* to match all requests. Also make '*' do the same.
|
|
*/
|
|
|
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#define NG_MATCH_EXACT 1
|
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#define NG_MATCH_ANY 2
|
|
|
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static hook_p
|
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pppoe_match_svc(node_p node, const char *svc_name, int svc_len, int match)
|
|
{
|
|
sessp sp = NULL;
|
|
negp neg = NULL;
|
|
priv_p privp = NG_NODE_PRIVATE(node);
|
|
hook_p allhook = NULL;
|
|
hook_p hook;
|
|
|
|
AAA
|
|
LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) {
|
|
|
|
/* skip any hook that is debug or ethernet */
|
|
if ((NG_HOOK_PRIVATE(hook) == &privp->debug_hook)
|
|
|| (NG_HOOK_PRIVATE(hook) == &privp->ethernet_hook))
|
|
continue;
|
|
sp = NG_HOOK_PRIVATE(hook);
|
|
|
|
/* Skip any sessions which are not in LISTEN mode. */
|
|
if ( sp->state != PPPOE_LISTENING)
|
|
continue;
|
|
|
|
neg = sp->neg;
|
|
|
|
/* Special case for a blank or "*" service name (wildcard) */
|
|
if (match == NG_MATCH_ANY && neg->service_len == 1 &&
|
|
neg->service.data[0] == '*') {
|
|
allhook = hook;
|
|
continue;
|
|
}
|
|
|
|
/* If the lengths don't match, that aint it. */
|
|
if (neg->service_len != svc_len)
|
|
continue;
|
|
|
|
/* An exact match? */
|
|
if (svc_len == 0)
|
|
break;
|
|
|
|
if (strncmp(svc_name, neg->service.data, svc_len) == 0)
|
|
break;
|
|
}
|
|
return (hook ? hook : allhook);
|
|
}
|
|
/**************************************************************************
|
|
* Routine to find a particular session that matches an incoming packet *
|
|
**************************************************************************/
|
|
static hook_p
|
|
pppoe_findsession(node_p node, const struct pppoe_full_hdr *wh)
|
|
{
|
|
sessp sp = NULL;
|
|
hook_p hook = NULL;
|
|
priv_p privp = NG_NODE_PRIVATE(node);
|
|
u_int16_t session = ntohs(wh->ph.sid);
|
|
|
|
/*
|
|
* find matching peer/session combination.
|
|
*/
|
|
AAA
|
|
LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) {
|
|
/* don't check special hooks */
|
|
if ((NG_HOOK_PRIVATE(hook) == &privp->debug_hook)
|
|
|| (NG_HOOK_PRIVATE(hook) == &privp->ethernet_hook)) {
|
|
continue;
|
|
}
|
|
sp = NG_HOOK_PRIVATE(hook);
|
|
if ( ( (sp->state == PPPOE_CONNECTED)
|
|
|| (sp->state == PPPOE_NEWCONNECTED) )
|
|
&& (sp->Session_ID == session)
|
|
&& (bcmp(sp->pkt_hdr.eh.ether_dhost,
|
|
wh->eh.ether_shost,
|
|
ETHER_ADDR_LEN)) == 0) {
|
|
break;
|
|
}
|
|
}
|
|
return (hook);
|
|
}
|
|
|
|
static hook_p
|
|
pppoe_finduniq(node_p node, const struct pppoe_tag *tag)
|
|
{
|
|
hook_p hook = NULL;
|
|
priv_p privp = NG_NODE_PRIVATE(node);
|
|
union uniq uniq;
|
|
|
|
AAA
|
|
bcopy(tag->tag_data, uniq.bytes, sizeof(void *));
|
|
/* cycle through all known hooks */
|
|
LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) {
|
|
/* don't check special hooks */
|
|
if ((NG_HOOK_PRIVATE(hook) == &privp->debug_hook)
|
|
|| (NG_HOOK_PRIVATE(hook) == &privp->ethernet_hook))
|
|
continue;
|
|
if (uniq.pointer == NG_HOOK_PRIVATE(hook))
|
|
break;
|
|
}
|
|
return (hook);
|
|
}
|
|
|
|
/**************************************************************************
|
|
* start of Netgraph entrypoints *
|
|
**************************************************************************/
|
|
|
|
/*
|
|
* Allocate the private data structure and the generic node
|
|
* and link them together.
|
|
*
|
|
* ng_make_node_common() returns with a generic node struct
|
|
* with a single reference for us.. we transfer it to the
|
|
* private structure.. when we free the private struct we must
|
|
* unref the node so it gets freed too.
|
|
*/
|
|
static int
|
|
ng_pppoe_constructor(node_p node)
|
|
{
|
|
priv_p privdata;
|
|
|
|
AAA
|
|
/* Initialize private descriptor */
|
|
MALLOC(privdata, priv_p, sizeof(*privdata), M_NETGRAPH_PPPOE,
|
|
M_NOWAIT | M_ZERO);
|
|
if (privdata == NULL)
|
|
return (ENOMEM);
|
|
|
|
/* Link structs together; this counts as our one reference to *nodep */
|
|
NG_NODE_SET_PRIVATE(node, privdata);
|
|
privdata->node = node;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Give our ok for a hook to be added...
|
|
* point the hook's private info to the hook structure.
|
|
*
|
|
* The following hook names are special:
|
|
* Ethernet: the hook that should be connected to a NIC.
|
|
* debug: copies of data sent out here (when I write the code).
|
|
* All other hook names need only be unique. (the framework checks this).
|
|
*/
|
|
static int
|
|
ng_pppoe_newhook(node_p node, hook_p hook, const char *name)
|
|
{
|
|
const priv_p privp = NG_NODE_PRIVATE(node);
|
|
sessp sp;
|
|
|
|
AAA
|
|
if (strcmp(name, NG_PPPOE_HOOK_ETHERNET) == 0) {
|
|
privp->ethernet_hook = hook;
|
|
NG_HOOK_SET_PRIVATE(hook, &privp->ethernet_hook);
|
|
} else if (strcmp(name, NG_PPPOE_HOOK_DEBUG) == 0) {
|
|
privp->debug_hook = hook;
|
|
NG_HOOK_SET_PRIVATE(hook, &privp->debug_hook);
|
|
} else {
|
|
/*
|
|
* Any other unique name is OK.
|
|
* The infrastructure has already checked that it's unique,
|
|
* so just allocate it and hook it in.
|
|
*/
|
|
MALLOC(sp, sessp, sizeof(*sp), M_NETGRAPH_PPPOE, M_NOWAIT | M_ZERO);
|
|
if (sp == NULL) {
|
|
return (ENOMEM);
|
|
}
|
|
|
|
NG_HOOK_SET_PRIVATE(hook, sp);
|
|
sp->hook = hook;
|
|
}
|
|
return(0);
|
|
}
|
|
|
|
/*
|
|
* Get a netgraph control message.
|
|
* Check it is one we understand. If needed, send a response.
|
|
* We sometimes save the address for an async action later.
|
|
* Always free the message.
|
|
*/
|
|
static int
|
|
ng_pppoe_rcvmsg(node_p node, item_p item, hook_p lasthook)
|
|
{
|
|
priv_p privp = NG_NODE_PRIVATE(node);
|
|
struct ngpppoe_init_data *ourmsg = NULL;
|
|
struct ng_mesg *resp = NULL;
|
|
int error = 0;
|
|
hook_p hook = NULL;
|
|
sessp sp = NULL;
|
|
negp neg = NULL;
|
|
struct ng_mesg *msg;
|
|
|
|
AAA
|
|
NGI_GET_MSG(item, msg);
|
|
/* Deal with message according to cookie and command */
|
|
switch (msg->header.typecookie) {
|
|
case NGM_PPPOE_COOKIE:
|
|
switch (msg->header.cmd) {
|
|
case NGM_PPPOE_CONNECT:
|
|
case NGM_PPPOE_LISTEN:
|
|
case NGM_PPPOE_OFFER:
|
|
case NGM_PPPOE_SERVICE:
|
|
ourmsg = (struct ngpppoe_init_data *)msg->data;
|
|
if (msg->header.arglen < sizeof(*ourmsg)) {
|
|
printf("pppoe: init data too small\n");
|
|
LEAVE(EMSGSIZE);
|
|
}
|
|
if (msg->header.arglen - sizeof(*ourmsg) >
|
|
PPPOE_SERVICE_NAME_SIZE) {
|
|
printf("pppoe_rcvmsg: service name too big");
|
|
LEAVE(EMSGSIZE);
|
|
}
|
|
if (msg->header.arglen - sizeof(*ourmsg) <
|
|
ourmsg->data_len) {
|
|
printf("pppoe: init data has bad length,"
|
|
" %d should be %zd\n", ourmsg->data_len,
|
|
msg->header.arglen - sizeof (*ourmsg));
|
|
LEAVE(EMSGSIZE);
|
|
}
|
|
|
|
/* make sure strcmp will terminate safely */
|
|
ourmsg->hook[sizeof(ourmsg->hook) - 1] = '\0';
|
|
|
|
/* cycle through all known hooks */
|
|
LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) {
|
|
if (NG_HOOK_NAME(hook)
|
|
&& strcmp(NG_HOOK_NAME(hook), ourmsg->hook) == 0)
|
|
break;
|
|
}
|
|
if (hook == NULL) {
|
|
LEAVE(ENOENT);
|
|
}
|
|
if ((NG_HOOK_PRIVATE(hook) == &privp->debug_hook)
|
|
|| (NG_HOOK_PRIVATE(hook) == &privp->ethernet_hook)) {
|
|
LEAVE(EINVAL);
|
|
}
|
|
sp = NG_HOOK_PRIVATE(hook);
|
|
|
|
if (msg->header.cmd == NGM_PPPOE_LISTEN) {
|
|
/*
|
|
* Ensure we aren't already listening for this
|
|
* service.
|
|
*/
|
|
if (pppoe_match_svc(node, ourmsg->data,
|
|
ourmsg->data_len, NG_MATCH_EXACT) != NULL) {
|
|
LEAVE(EEXIST);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* PPPOE_SERVICE advertisments are set up
|
|
* on sessions that are in PRIMED state.
|
|
*/
|
|
if (msg->header.cmd == NGM_PPPOE_SERVICE) {
|
|
break;
|
|
}
|
|
if (sp->state |= PPPOE_SNONE) {
|
|
printf("pppoe: Session already active\n");
|
|
LEAVE(EISCONN);
|
|
}
|
|
|
|
/*
|
|
* set up prototype header
|
|
*/
|
|
MALLOC(neg, negp, sizeof(*neg), M_NETGRAPH_PPPOE,
|
|
M_NOWAIT | M_ZERO);
|
|
|
|
if (neg == NULL) {
|
|
printf("pppoe: Session out of memory\n");
|
|
LEAVE(ENOMEM);
|
|
}
|
|
MGETHDR(neg->m, M_DONTWAIT, MT_DATA);
|
|
if(neg->m == NULL) {
|
|
printf("pppoe: Session out of mbufs\n");
|
|
FREE(neg, M_NETGRAPH_PPPOE);
|
|
LEAVE(ENOBUFS);
|
|
}
|
|
neg->m->m_pkthdr.rcvif = NULL;
|
|
MCLGET(neg->m, M_DONTWAIT);
|
|
if ((neg->m->m_flags & M_EXT) == 0) {
|
|
printf("pppoe: Session out of mcls\n");
|
|
m_freem(neg->m);
|
|
FREE(neg, M_NETGRAPH_PPPOE);
|
|
LEAVE(ENOBUFS);
|
|
}
|
|
sp->neg = neg;
|
|
callout_handle_init( &neg->timeout_handle);
|
|
neg->m->m_len = sizeof(struct pppoe_full_hdr);
|
|
neg->pkt = mtod(neg->m, union packet*);
|
|
neg->pkt->pkt_header.eh = eh_prototype;
|
|
neg->pkt->pkt_header.ph.ver = 0x1;
|
|
neg->pkt->pkt_header.ph.type = 0x1;
|
|
neg->pkt->pkt_header.ph.sid = 0x0000;
|
|
neg->timeout = 0;
|
|
|
|
sp->creator = NGI_RETADDR(item);
|
|
}
|
|
switch (msg->header.cmd) {
|
|
case NGM_PPPOE_GET_STATUS:
|
|
{
|
|
struct ngpppoestat *stats;
|
|
|
|
NG_MKRESPONSE(resp, msg, sizeof(*stats), M_NOWAIT);
|
|
if (!resp) {
|
|
LEAVE(ENOMEM);
|
|
}
|
|
stats = (struct ngpppoestat *) resp->data;
|
|
stats->packets_in = privp->packets_in;
|
|
stats->packets_out = privp->packets_out;
|
|
break;
|
|
}
|
|
case NGM_PPPOE_CONNECT:
|
|
/*
|
|
* Check the hook exists and is Uninitialised.
|
|
* Send a PADI request, and start the timeout logic.
|
|
* Store the originator of this message so we can send
|
|
* a success of fail message to them later.
|
|
* Move the session to SINIT
|
|
* Set up the session to the correct state and
|
|
* start it.
|
|
*/
|
|
neg->service.hdr.tag_type = PTT_SRV_NAME;
|
|
neg->service.hdr.tag_len =
|
|
htons((u_int16_t)ourmsg->data_len);
|
|
if (ourmsg->data_len)
|
|
bcopy(ourmsg->data, neg->service.data,
|
|
ourmsg->data_len);
|
|
neg->service_len = ourmsg->data_len;
|
|
pppoe_start(sp);
|
|
break;
|
|
case NGM_PPPOE_LISTEN:
|
|
/*
|
|
* Check the hook exists and is Uninitialised.
|
|
* Install the service matching string.
|
|
* Store the originator of this message so we can send
|
|
* a success of fail message to them later.
|
|
* Move the hook to 'LISTENING'
|
|
*/
|
|
neg->service.hdr.tag_type = PTT_SRV_NAME;
|
|
neg->service.hdr.tag_len =
|
|
htons((u_int16_t)ourmsg->data_len);
|
|
|
|
if (ourmsg->data_len)
|
|
bcopy(ourmsg->data, neg->service.data,
|
|
ourmsg->data_len);
|
|
neg->service_len = ourmsg->data_len;
|
|
neg->pkt->pkt_header.ph.code = PADT_CODE;
|
|
/*
|
|
* wait for PADI packet coming from ethernet
|
|
*/
|
|
sp->state = PPPOE_LISTENING;
|
|
break;
|
|
case NGM_PPPOE_OFFER:
|
|
/*
|
|
* Check the hook exists and is Uninitialised.
|
|
* Store the originator of this message so we can send
|
|
* a success of fail message to them later.
|
|
* Store the AC-Name given and go to PRIMED.
|
|
*/
|
|
neg->ac_name.hdr.tag_type = PTT_AC_NAME;
|
|
neg->ac_name.hdr.tag_len =
|
|
htons((u_int16_t)ourmsg->data_len);
|
|
if (ourmsg->data_len)
|
|
bcopy(ourmsg->data, neg->ac_name.data,
|
|
ourmsg->data_len);
|
|
neg->ac_name_len = ourmsg->data_len;
|
|
neg->pkt->pkt_header.ph.code = PADO_CODE;
|
|
/*
|
|
* Wait for PADI packet coming from hook
|
|
*/
|
|
sp->state = PPPOE_PRIMED;
|
|
break;
|
|
case NGM_PPPOE_SERVICE:
|
|
/*
|
|
* Check the session is primed.
|
|
* for now just allow ONE service to be advertised.
|
|
* If you do it twice you just overwrite.
|
|
*/
|
|
if (sp->state != PPPOE_PRIMED) {
|
|
printf("pppoe: Session not primed\n");
|
|
LEAVE(EISCONN);
|
|
}
|
|
neg = sp->neg;
|
|
neg->service.hdr.tag_type = PTT_SRV_NAME;
|
|
neg->service.hdr.tag_len =
|
|
htons((u_int16_t)ourmsg->data_len);
|
|
|
|
if (ourmsg->data_len)
|
|
bcopy(ourmsg->data, neg->service.data,
|
|
ourmsg->data_len);
|
|
neg->service_len = ourmsg->data_len;
|
|
break;
|
|
default:
|
|
LEAVE(EINVAL);
|
|
}
|
|
break;
|
|
default:
|
|
LEAVE(EINVAL);
|
|
}
|
|
|
|
/* Take care of synchronous response, if any */
|
|
quit:
|
|
NG_RESPOND_MSG(error, node, item, resp);
|
|
/* Free the message and return */
|
|
NG_FREE_MSG(msg);
|
|
return(error);
|
|
}
|
|
|
|
/*
|
|
* Start a client into the first state. A separate function because
|
|
* it can be needed if the negotiation times out.
|
|
*/
|
|
static void
|
|
pppoe_start(sessp sp)
|
|
{
|
|
struct {
|
|
struct pppoe_tag hdr;
|
|
union uniq data;
|
|
} __packed uniqtag;
|
|
|
|
/*
|
|
* kick the state machine into starting up
|
|
*/
|
|
AAA
|
|
sp->state = PPPOE_SINIT;
|
|
/* reset the packet header to broadcast */
|
|
sp->neg->pkt->pkt_header.eh = eh_prototype;
|
|
sp->neg->pkt->pkt_header.ph.code = PADI_CODE;
|
|
uniqtag.hdr.tag_type = PTT_HOST_UNIQ;
|
|
uniqtag.hdr.tag_len = htons((u_int16_t)sizeof(uniqtag.data));
|
|
uniqtag.data.pointer = sp;
|
|
init_tags(sp);
|
|
insert_tag(sp, &uniqtag.hdr);
|
|
insert_tag(sp, &sp->neg->service.hdr);
|
|
make_packet(sp);
|
|
sendpacket(sp);
|
|
}
|
|
|
|
static int
|
|
send_acname(sessp sp, const struct pppoe_tag *tag)
|
|
{
|
|
int error, tlen;
|
|
struct ng_mesg *msg;
|
|
struct ngpppoe_sts *sts;
|
|
|
|
NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_ACNAME,
|
|
sizeof(struct ngpppoe_sts), M_NOWAIT);
|
|
if (msg == NULL)
|
|
return (ENOMEM);
|
|
|
|
sts = (struct ngpppoe_sts *)msg->data;
|
|
tlen = min(NG_HOOKSIZ - 1, ntohs(tag->tag_len));
|
|
strncpy(sts->hook, tag->tag_data, tlen);
|
|
sts->hook[tlen] = '\0';
|
|
NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0);
|
|
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
send_sessionid(sessp sp)
|
|
{
|
|
int error;
|
|
struct ng_mesg *msg;
|
|
|
|
NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_SESSIONID,
|
|
sizeof(u_int16_t), M_NOWAIT);
|
|
if (msg == NULL)
|
|
return (ENOMEM);
|
|
|
|
*(u_int16_t *)msg->data = sp->Session_ID;
|
|
NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0);
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Receive data, and do something with it.
|
|
* The caller will never free m, so if we use up this data
|
|
* or abort we must free it.
|
|
*/
|
|
static int
|
|
ng_pppoe_rcvdata(hook_p hook, item_p item)
|
|
{
|
|
node_p node = NG_HOOK_NODE(hook);
|
|
const priv_p privp = NG_NODE_PRIVATE(node);
|
|
sessp sp = NG_HOOK_PRIVATE(hook);
|
|
const struct pppoe_full_hdr *wh;
|
|
const struct pppoe_hdr *ph;
|
|
int error = 0;
|
|
u_int16_t session;
|
|
u_int16_t length;
|
|
u_int8_t code;
|
|
const struct pppoe_tag *utag = NULL, *tag = NULL;
|
|
hook_p sendhook;
|
|
struct {
|
|
struct pppoe_tag hdr;
|
|
union uniq data;
|
|
} __packed uniqtag;
|
|
negp neg = NULL;
|
|
struct mbuf *m;
|
|
|
|
AAA
|
|
NGI_GET_M(item, m);
|
|
if (NG_HOOK_PRIVATE(hook) == &privp->debug_hook) {
|
|
/*
|
|
* Data from the debug hook gets sent without modification
|
|
* straight to the ethernet.
|
|
*/
|
|
NG_FWD_ITEM_HOOK( error, item, privp->ethernet_hook);
|
|
privp->packets_out++;
|
|
} else if (NG_HOOK_PRIVATE(hook) == &privp->ethernet_hook) {
|
|
/*
|
|
* Incoming data.
|
|
* Dig out various fields from the packet.
|
|
* use them to decide where to send it.
|
|
*/
|
|
|
|
privp->packets_in++;
|
|
if( m->m_len < sizeof(*wh)) {
|
|
m = m_pullup(m, sizeof(*wh)); /* Checks length */
|
|
if (m == NULL) {
|
|
printf("couldn't m_pullup\n");
|
|
LEAVE(ENOBUFS);
|
|
}
|
|
}
|
|
wh = mtod(m, struct pppoe_full_hdr *);
|
|
length = ntohs(wh->ph.length);
|
|
switch(wh->eh.ether_type) {
|
|
case ETHERTYPE_PPPOE_STUPID_DISC:
|
|
if (pppoe_mode == PPPOE_STANDARD) {
|
|
pppoe_mode = PPPOE_NONSTANDARD;
|
|
eh_prototype.ether_type =
|
|
ETHERTYPE_PPPOE_STUPID_DISC;
|
|
log(LOG_NOTICE,
|
|
"Switched to nonstandard PPPoE mode due to "
|
|
"packet from %*D\n",
|
|
ETHER_ADDR_LEN,
|
|
wh->eh.ether_shost, ":");
|
|
} else if (pppoe_mode == PPPOE_KEEPSTANDARD)
|
|
log(LOG_NOTICE,
|
|
"Ignored nonstandard PPPoE packet "
|
|
"from %*D\n",
|
|
ETHER_ADDR_LEN,
|
|
wh->eh.ether_shost, ":");
|
|
/* fall through */
|
|
case ETHERTYPE_PPPOE_DISC:
|
|
/*
|
|
* We need to try to make sure that the tag area
|
|
* is contiguous, or we could wander off the end
|
|
* of a buffer and make a mess.
|
|
* (Linux wouldn't have this problem).
|
|
*/
|
|
if (m->m_pkthdr.len <= MHLEN) {
|
|
if( m->m_len < m->m_pkthdr.len) {
|
|
m = m_pullup(m, m->m_pkthdr.len);
|
|
if (m == NULL) {
|
|
printf("couldn't m_pullup\n");
|
|
LEAVE(ENOBUFS);
|
|
}
|
|
}
|
|
}
|
|
if (m->m_len != m->m_pkthdr.len) {
|
|
/*
|
|
* It's not all in one piece.
|
|
* We need to do extra work.
|
|
* Put it into a cluster.
|
|
*/
|
|
struct mbuf *n;
|
|
n = m_dup(m, M_DONTWAIT);
|
|
m_freem(m);
|
|
m = n;
|
|
if (m) {
|
|
/* just check we got a cluster */
|
|
if (m->m_len != m->m_pkthdr.len) {
|
|
m_freem(m);
|
|
m = NULL;
|
|
}
|
|
}
|
|
if (m == NULL) {
|
|
printf("packet fragmented\n");
|
|
LEAVE(EMSGSIZE);
|
|
}
|
|
}
|
|
wh = mtod(m, struct pppoe_full_hdr *);
|
|
length = ntohs(wh->ph.length);
|
|
ph = &wh->ph;
|
|
session = ntohs(wh->ph.sid);
|
|
code = wh->ph.code;
|
|
|
|
switch(code) {
|
|
case PADI_CODE:
|
|
/*
|
|
* We are a server:
|
|
* Look for a hook with the required service
|
|
* and send the ENTIRE packet up there.
|
|
* It should come back to a new hook in
|
|
* PRIMED state. Look there for further
|
|
* processing.
|
|
*/
|
|
tag = get_tag(ph, PTT_SRV_NAME);
|
|
if (tag == NULL) {
|
|
printf("no service tag\n");
|
|
LEAVE(ENETUNREACH);
|
|
}
|
|
sendhook = pppoe_match_svc(NG_HOOK_NODE(hook),
|
|
tag->tag_data, ntohs(tag->tag_len),
|
|
NG_MATCH_ANY);
|
|
if (sendhook) {
|
|
NG_FWD_NEW_DATA(error, item,
|
|
sendhook, m);
|
|
} else {
|
|
LEAVE(ENETUNREACH);
|
|
}
|
|
break;
|
|
case PADO_CODE:
|
|
/*
|
|
* We are a client:
|
|
* Use the host_uniq tag to find the
|
|
* hook this is in response to.
|
|
* Received #2, now send #3
|
|
* For now simply accept the first we receive.
|
|
*/
|
|
utag = get_tag(ph, PTT_HOST_UNIQ);
|
|
if ((utag == NULL)
|
|
|| (ntohs(utag->tag_len) != sizeof(sp))) {
|
|
printf("no host unique field\n");
|
|
LEAVE(ENETUNREACH);
|
|
}
|
|
|
|
sendhook = pppoe_finduniq(node, utag);
|
|
if (sendhook == NULL) {
|
|
printf("no matching session\n");
|
|
LEAVE(ENETUNREACH);
|
|
}
|
|
|
|
/*
|
|
* Check the session is in the right state.
|
|
* It needs to be in PPPOE_SINIT.
|
|
*/
|
|
sp = NG_HOOK_PRIVATE(sendhook);
|
|
if (sp->state != PPPOE_SINIT) {
|
|
printf("session in wrong state\n");
|
|
LEAVE(ENETUNREACH);
|
|
}
|
|
neg = sp->neg;
|
|
untimeout(pppoe_ticker, sendhook,
|
|
neg->timeout_handle);
|
|
|
|
/*
|
|
* This is the first time we hear
|
|
* from the server, so note it's
|
|
* unicast address, replacing the
|
|
* broadcast address .
|
|
*/
|
|
bcopy(wh->eh.ether_shost,
|
|
neg->pkt->pkt_header.eh.ether_dhost,
|
|
ETHER_ADDR_LEN);
|
|
neg->timeout = 0;
|
|
neg->pkt->pkt_header.ph.code = PADR_CODE;
|
|
init_tags(sp);
|
|
insert_tag(sp, utag); /* Host Unique */
|
|
if ((tag = get_tag(ph, PTT_AC_COOKIE)))
|
|
insert_tag(sp, tag); /* return cookie */
|
|
if ((tag = get_tag(ph, PTT_AC_NAME))) {
|
|
insert_tag(sp, tag); /* return it */
|
|
send_acname(sp, tag);
|
|
}
|
|
insert_tag(sp, &neg->service.hdr); /* Service */
|
|
scan_tags(sp, ph);
|
|
make_packet(sp);
|
|
sp->state = PPPOE_SREQ;
|
|
sendpacket(sp);
|
|
break;
|
|
case PADR_CODE:
|
|
|
|
/*
|
|
* We are a server:
|
|
* Use the ac_cookie tag to find the
|
|
* hook this is in response to.
|
|
*/
|
|
utag = get_tag(ph, PTT_AC_COOKIE);
|
|
if ((utag == NULL)
|
|
|| (ntohs(utag->tag_len) != sizeof(sp))) {
|
|
LEAVE(ENETUNREACH);
|
|
}
|
|
|
|
sendhook = pppoe_finduniq(node, utag);
|
|
if (sendhook == NULL) {
|
|
LEAVE(ENETUNREACH);
|
|
}
|
|
|
|
/*
|
|
* Check the session is in the right state.
|
|
* It needs to be in PPPOE_SOFFER
|
|
* or PPPOE_NEWCONNECTED. If the latter,
|
|
* then this is a retry by the client.
|
|
* so be nice, and resend.
|
|
*/
|
|
sp = NG_HOOK_PRIVATE(sendhook);
|
|
if (sp->state == PPPOE_NEWCONNECTED) {
|
|
/*
|
|
* Whoa! drop back to resend that
|
|
* PADS packet.
|
|
* We should still have a copy of it.
|
|
*/
|
|
sp->state = PPPOE_SOFFER;
|
|
}
|
|
if (sp->state != PPPOE_SOFFER) {
|
|
LEAVE (ENETUNREACH);
|
|
break;
|
|
}
|
|
neg = sp->neg;
|
|
untimeout(pppoe_ticker, sendhook,
|
|
neg->timeout_handle);
|
|
neg->pkt->pkt_header.ph.code = PADS_CODE;
|
|
if (sp->Session_ID == 0)
|
|
neg->pkt->pkt_header.ph.sid =
|
|
htons(sp->Session_ID
|
|
= get_new_sid(node));
|
|
send_sessionid(sp);
|
|
neg->timeout = 0;
|
|
/*
|
|
* start working out the tags to respond with.
|
|
*/
|
|
init_tags(sp);
|
|
insert_tag(sp, &neg->ac_name.hdr); /* AC_NAME */
|
|
if ((tag = get_tag(ph, PTT_SRV_NAME)))
|
|
insert_tag(sp, tag);/* return service */
|
|
if ((tag = get_tag(ph, PTT_HOST_UNIQ)))
|
|
insert_tag(sp, tag); /* return it */
|
|
insert_tag(sp, utag); /* ac_cookie */
|
|
scan_tags(sp, ph);
|
|
make_packet(sp);
|
|
sp->state = PPPOE_NEWCONNECTED;
|
|
sendpacket(sp);
|
|
/*
|
|
* Having sent the last Negotiation header,
|
|
* Set up the stored packet header to
|
|
* be correct for the actual session.
|
|
* But keep the negotialtion stuff
|
|
* around in case we need to resend this last
|
|
* packet. We'll discard it when we move
|
|
* from NEWCONNECTED to CONNECTED
|
|
*/
|
|
sp->pkt_hdr = neg->pkt->pkt_header;
|
|
if (pppoe_mode == PPPOE_NONSTANDARD)
|
|
sp->pkt_hdr.eh.ether_type
|
|
= ETHERTYPE_PPPOE_STUPID_SESS;
|
|
else
|
|
sp->pkt_hdr.eh.ether_type
|
|
= ETHERTYPE_PPPOE_SESS;
|
|
sp->pkt_hdr.ph.code = 0;
|
|
pppoe_send_event(sp, NGM_PPPOE_SUCCESS);
|
|
break;
|
|
case PADS_CODE:
|
|
/*
|
|
* We are a client:
|
|
* Use the host_uniq tag to find the
|
|
* hook this is in response to.
|
|
* take the session ID and store it away.
|
|
* Also make sure the pre-made header is
|
|
* correct and set us into Session mode.
|
|
*/
|
|
utag = get_tag(ph, PTT_HOST_UNIQ);
|
|
if ((utag == NULL)
|
|
|| (ntohs(utag->tag_len) != sizeof(sp))) {
|
|
LEAVE (ENETUNREACH);
|
|
break;
|
|
}
|
|
sendhook = pppoe_finduniq(node, utag);
|
|
if (sendhook == NULL) {
|
|
LEAVE(ENETUNREACH);
|
|
}
|
|
|
|
/*
|
|
* Check the session is in the right state.
|
|
* It needs to be in PPPOE_SREQ.
|
|
*/
|
|
sp = NG_HOOK_PRIVATE(sendhook);
|
|
if (sp->state != PPPOE_SREQ) {
|
|
LEAVE(ENETUNREACH);
|
|
}
|
|
neg = sp->neg;
|
|
untimeout(pppoe_ticker, sendhook,
|
|
neg->timeout_handle);
|
|
neg->pkt->pkt_header.ph.sid = wh->ph.sid;
|
|
sp->Session_ID = ntohs(wh->ph.sid);
|
|
send_sessionid(sp);
|
|
neg->timeout = 0;
|
|
sp->state = PPPOE_CONNECTED;
|
|
/*
|
|
* Now we have gone to Connected mode,
|
|
* Free all resources needed for
|
|
* negotiation.
|
|
* Keep a copy of the header we will be using.
|
|
*/
|
|
sp->pkt_hdr = neg->pkt->pkt_header;
|
|
if (pppoe_mode == PPPOE_NONSTANDARD)
|
|
sp->pkt_hdr.eh.ether_type
|
|
= ETHERTYPE_PPPOE_STUPID_SESS;
|
|
else
|
|
sp->pkt_hdr.eh.ether_type
|
|
= ETHERTYPE_PPPOE_SESS;
|
|
sp->pkt_hdr.ph.code = 0;
|
|
m_freem(neg->m);
|
|
FREE(sp->neg, M_NETGRAPH_PPPOE);
|
|
sp->neg = NULL;
|
|
pppoe_send_event(sp, NGM_PPPOE_SUCCESS);
|
|
break;
|
|
case PADT_CODE:
|
|
/*
|
|
* Send a 'close' message to the controlling
|
|
* process (the one that set us up);
|
|
* And then tear everything down.
|
|
*
|
|
* Find matching peer/session combination.
|
|
*/
|
|
sendhook = pppoe_findsession(node, wh);
|
|
if (sendhook == NULL) {
|
|
LEAVE(ENETUNREACH);
|
|
}
|
|
/* send message to creator */
|
|
/* close hook */
|
|
if (sendhook) {
|
|
ng_rmhook_self(sendhook);
|
|
}
|
|
break;
|
|
default:
|
|
LEAVE(EPFNOSUPPORT);
|
|
}
|
|
break;
|
|
case ETHERTYPE_PPPOE_STUPID_SESS:
|
|
case ETHERTYPE_PPPOE_SESS:
|
|
/*
|
|
* find matching peer/session combination.
|
|
*/
|
|
sendhook = pppoe_findsession(node, wh);
|
|
if (sendhook == NULL) {
|
|
LEAVE (ENETUNREACH);
|
|
break;
|
|
}
|
|
sp = NG_HOOK_PRIVATE(sendhook);
|
|
m_adj(m, sizeof(*wh));
|
|
if (m->m_pkthdr.len < length) {
|
|
/* Packet too short, dump it */
|
|
LEAVE(EMSGSIZE);
|
|
}
|
|
|
|
/* Also need to trim excess at the end */
|
|
if (m->m_pkthdr.len > length) {
|
|
m_adj(m, -((int)(m->m_pkthdr.len - length)));
|
|
}
|
|
if ( sp->state != PPPOE_CONNECTED) {
|
|
if (sp->state == PPPOE_NEWCONNECTED) {
|
|
sp->state = PPPOE_CONNECTED;
|
|
/*
|
|
* Now we have gone to Connected mode,
|
|
* Free all resources needed for
|
|
* negotiation. Be paranoid about
|
|
* whether there may be a timeout.
|
|
*/
|
|
m_freem(sp->neg->m);
|
|
untimeout(pppoe_ticker, sendhook,
|
|
sp->neg->timeout_handle);
|
|
FREE(sp->neg, M_NETGRAPH_PPPOE);
|
|
sp->neg = NULL;
|
|
} else {
|
|
LEAVE (ENETUNREACH);
|
|
break;
|
|
}
|
|
}
|
|
NG_FWD_NEW_DATA( error, item, sendhook, m);
|
|
break;
|
|
default:
|
|
LEAVE(EPFNOSUPPORT);
|
|
}
|
|
} else {
|
|
/*
|
|
* Not ethernet or debug hook..
|
|
*
|
|
* The packet has come in on a normal hook.
|
|
* We need to find out what kind of hook,
|
|
* So we can decide how to handle it.
|
|
* Check the hook's state.
|
|
*/
|
|
sp = NG_HOOK_PRIVATE(hook);
|
|
switch (sp->state) {
|
|
case PPPOE_NEWCONNECTED:
|
|
case PPPOE_CONNECTED: {
|
|
static const u_char addrctrl[] = { 0xff, 0x03 };
|
|
struct pppoe_full_hdr *wh;
|
|
|
|
/*
|
|
* Remove PPP address and control fields, if any.
|
|
* For example, ng_ppp(4) always sends LCP packets
|
|
* with address and control fields as required by
|
|
* generic PPP. PPPoE is an exception to the rule.
|
|
*/
|
|
if (m->m_pkthdr.len >= 2) {
|
|
if (m->m_len < 2 && !(m = m_pullup(m, 2)))
|
|
LEAVE(ENOBUFS);
|
|
if (bcmp(mtod(m, u_char *), addrctrl, 2) == 0)
|
|
m_adj(m, 2);
|
|
}
|
|
/*
|
|
* Bang in a pre-made header, and set the length up
|
|
* to be correct. Then send it to the ethernet driver.
|
|
* But first correct the length.
|
|
*/
|
|
sp->pkt_hdr.ph.length = htons((short)(m->m_pkthdr.len));
|
|
M_PREPEND(m, sizeof(*wh), M_DONTWAIT);
|
|
if (m == NULL) {
|
|
LEAVE(ENOBUFS);
|
|
}
|
|
wh = mtod(m, struct pppoe_full_hdr *);
|
|
bcopy(&sp->pkt_hdr, wh, sizeof(*wh));
|
|
NG_FWD_NEW_DATA( error, item, privp->ethernet_hook, m);
|
|
privp->packets_out++;
|
|
break;
|
|
}
|
|
case PPPOE_PRIMED:
|
|
/*
|
|
* A PADI packet is being returned by the application
|
|
* that has set up this hook. This indicates that it
|
|
* wants us to offer service.
|
|
*/
|
|
neg = sp->neg;
|
|
if (m->m_len < sizeof(*wh)) {
|
|
m = m_pullup(m, sizeof(*wh));
|
|
if (m == NULL) {
|
|
LEAVE(ENOBUFS);
|
|
}
|
|
}
|
|
wh = mtod(m, struct pppoe_full_hdr *);
|
|
ph = &wh->ph;
|
|
session = ntohs(wh->ph.sid);
|
|
length = ntohs(wh->ph.length);
|
|
code = wh->ph.code;
|
|
if ( code != PADI_CODE) {
|
|
LEAVE(EINVAL);
|
|
};
|
|
untimeout(pppoe_ticker, hook,
|
|
neg->timeout_handle);
|
|
|
|
/*
|
|
* This is the first time we hear
|
|
* from the client, so note it's
|
|
* unicast address, replacing the
|
|
* broadcast address.
|
|
*/
|
|
bcopy(wh->eh.ether_shost,
|
|
neg->pkt->pkt_header.eh.ether_dhost,
|
|
ETHER_ADDR_LEN);
|
|
sp->state = PPPOE_SOFFER;
|
|
neg->timeout = 0;
|
|
neg->pkt->pkt_header.ph.code = PADO_CODE;
|
|
|
|
/*
|
|
* start working out the tags to respond with.
|
|
*/
|
|
uniqtag.hdr.tag_type = PTT_AC_COOKIE;
|
|
uniqtag.hdr.tag_len = htons((u_int16_t)sizeof(sp));
|
|
uniqtag.data.pointer = sp;
|
|
init_tags(sp);
|
|
insert_tag(sp, &neg->ac_name.hdr); /* AC_NAME */
|
|
if ((tag = get_tag(ph, PTT_SRV_NAME)))
|
|
insert_tag(sp, tag); /* return service */
|
|
/*
|
|
* If we have a NULL service request
|
|
* and have an extra service defined in this hook,
|
|
* then also add a tag for the extra service.
|
|
* XXX this is a hack. eventually we should be able
|
|
* to support advertising many services, not just one
|
|
*/
|
|
if (((tag == NULL) || (tag->tag_len == 0))
|
|
&& (neg->service.hdr.tag_len != 0)) {
|
|
insert_tag(sp, &neg->service.hdr); /* SERVICE */
|
|
}
|
|
if ((tag = get_tag(ph, PTT_HOST_UNIQ)))
|
|
insert_tag(sp, tag); /* returned hostunique */
|
|
insert_tag(sp, &uniqtag.hdr);
|
|
scan_tags(sp, ph);
|
|
make_packet(sp);
|
|
sendpacket(sp);
|
|
break;
|
|
|
|
/*
|
|
* Packets coming from the hook make no sense
|
|
* to sessions in these states. Throw them away.
|
|
*/
|
|
case PPPOE_SINIT:
|
|
case PPPOE_SREQ:
|
|
case PPPOE_SOFFER:
|
|
case PPPOE_SNONE:
|
|
case PPPOE_LISTENING:
|
|
case PPPOE_DEAD:
|
|
default:
|
|
LEAVE(ENETUNREACH);
|
|
}
|
|
}
|
|
quit:
|
|
if (item)
|
|
NG_FREE_ITEM(item);
|
|
NG_FREE_M(m);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Do local shutdown processing..
|
|
* If we are a persistant device, we might refuse to go away, and
|
|
* we'd only remove our links and reset ourself.
|
|
*/
|
|
static int
|
|
ng_pppoe_shutdown(node_p node)
|
|
{
|
|
const priv_p privdata = NG_NODE_PRIVATE(node);
|
|
|
|
AAA
|
|
NG_NODE_SET_PRIVATE(node, NULL);
|
|
NG_NODE_UNREF(privdata->node);
|
|
FREE(privdata, M_NETGRAPH_PPPOE);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* This is called once we've already connected a new hook to the other node.
|
|
* It gives us a chance to balk at the last minute.
|
|
*/
|
|
static int
|
|
ng_pppoe_connect(hook_p hook)
|
|
{
|
|
/* be really amiable and just say "YUP that's OK by me! " */
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Hook disconnection
|
|
*
|
|
* Clean up all dangling links and information about the session/hook.
|
|
* For this type, removal of the last link destroys the node
|
|
*/
|
|
static int
|
|
ng_pppoe_disconnect(hook_p hook)
|
|
{
|
|
node_p node = NG_HOOK_NODE(hook);
|
|
priv_p privp = NG_NODE_PRIVATE(node);
|
|
sessp sp;
|
|
int hooks;
|
|
|
|
AAA
|
|
hooks = NG_NODE_NUMHOOKS(node); /* this one already not counted */
|
|
if (NG_HOOK_PRIVATE(hook) == &privp->debug_hook) {
|
|
privp->debug_hook = NULL;
|
|
} else if (NG_HOOK_PRIVATE(hook) == &privp->ethernet_hook) {
|
|
privp->ethernet_hook = NULL;
|
|
if (NG_NODE_IS_VALID(node))
|
|
ng_rmnode_self(node);
|
|
} else {
|
|
sp = NG_HOOK_PRIVATE(hook);
|
|
if (sp->state != PPPOE_SNONE ) {
|
|
pppoe_send_event(sp, NGM_PPPOE_CLOSE);
|
|
}
|
|
/*
|
|
* According to the spec, if we are connected,
|
|
* we should send a DISC packet if we are shutting down
|
|
* a session.
|
|
*/
|
|
if ((privp->ethernet_hook)
|
|
&& ((sp->state == PPPOE_CONNECTED)
|
|
|| (sp->state == PPPOE_NEWCONNECTED))) {
|
|
struct mbuf *m;
|
|
struct pppoe_full_hdr *wh;
|
|
struct pppoe_tag *tag;
|
|
int msglen = strlen(SIGNOFF);
|
|
int error = 0;
|
|
|
|
/* revert the stored header to DISC/PADT mode */
|
|
wh = &sp->pkt_hdr;
|
|
wh->ph.code = PADT_CODE;
|
|
if (pppoe_mode == PPPOE_NONSTANDARD)
|
|
wh->eh.ether_type = ETHERTYPE_PPPOE_STUPID_DISC;
|
|
else
|
|
wh->eh.ether_type = ETHERTYPE_PPPOE_DISC;
|
|
|
|
/* generate a packet of that type */
|
|
MGETHDR(m, M_DONTWAIT, MT_DATA);
|
|
if(m == NULL)
|
|
printf("pppoe: Session out of mbufs\n");
|
|
else {
|
|
m->m_pkthdr.rcvif = NULL;
|
|
m->m_pkthdr.len = m->m_len = sizeof(*wh);
|
|
bcopy((caddr_t)wh, mtod(m, caddr_t),
|
|
sizeof(*wh));
|
|
/*
|
|
* Add a General error message and adjust
|
|
* sizes
|
|
*/
|
|
wh = mtod(m, struct pppoe_full_hdr *);
|
|
tag = wh->ph.tag;
|
|
tag->tag_type = PTT_GEN_ERR;
|
|
tag->tag_len = htons((u_int16_t)msglen);
|
|
strncpy(tag->tag_data, SIGNOFF, msglen);
|
|
m->m_pkthdr.len = (m->m_len += sizeof(*tag) +
|
|
msglen);
|
|
wh->ph.length = htons(sizeof(*tag) + msglen);
|
|
NG_SEND_DATA_ONLY(error,
|
|
privp->ethernet_hook, m);
|
|
}
|
|
}
|
|
/*
|
|
* As long as we have somewhere to store the timeout handle,
|
|
* we may have a timeout pending.. get rid of it.
|
|
*/
|
|
if (sp->neg) {
|
|
untimeout(pppoe_ticker, hook, sp->neg->timeout_handle);
|
|
if (sp->neg->m)
|
|
m_freem(sp->neg->m);
|
|
FREE(sp->neg, M_NETGRAPH_PPPOE);
|
|
}
|
|
FREE(sp, M_NETGRAPH_PPPOE);
|
|
NG_HOOK_SET_PRIVATE(hook, NULL);
|
|
/* work out how many session hooks there are */
|
|
/* Node goes away on last session hook removal */
|
|
if (privp->ethernet_hook) hooks -= 1;
|
|
if (privp->debug_hook) hooks -= 1;
|
|
}
|
|
if ((NG_NODE_NUMHOOKS(node) == 0)
|
|
&& (NG_NODE_IS_VALID(node)))
|
|
ng_rmnode_self(node);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* timeouts come here.
|
|
*/
|
|
static void
|
|
pppoe_ticker(void *arg)
|
|
{
|
|
int s = splnet();
|
|
hook_p hook = arg;
|
|
sessp sp = NG_HOOK_PRIVATE(hook);
|
|
negp neg = sp->neg;
|
|
int error = 0;
|
|
struct mbuf *m0 = NULL;
|
|
priv_p privp = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
|
|
|
|
AAA
|
|
switch(sp->state) {
|
|
/*
|
|
* resend the last packet, using an exponential backoff.
|
|
* After a period of time, stop growing the backoff,
|
|
* and either leave it, or revert to the start.
|
|
*/
|
|
case PPPOE_SINIT:
|
|
case PPPOE_SREQ:
|
|
/* timeouts on these produce resends */
|
|
m0 = m_copypacket(sp->neg->m, M_DONTWAIT);
|
|
NG_SEND_DATA_ONLY( error, privp->ethernet_hook, m0);
|
|
neg->timeout_handle = timeout(pppoe_ticker,
|
|
hook, neg->timeout * hz);
|
|
if ((neg->timeout <<= 1) > PPPOE_TIMEOUT_LIMIT) {
|
|
if (sp->state == PPPOE_SREQ) {
|
|
/* revert to SINIT mode */
|
|
pppoe_start(sp);
|
|
} else {
|
|
neg->timeout = PPPOE_TIMEOUT_LIMIT;
|
|
}
|
|
}
|
|
break;
|
|
case PPPOE_PRIMED:
|
|
case PPPOE_SOFFER:
|
|
/* a timeout on these says "give up" */
|
|
ng_rmhook_self(hook);
|
|
break;
|
|
default:
|
|
/* timeouts have no meaning in other states */
|
|
printf("pppoe: unexpected timeout\n");
|
|
}
|
|
splx(s);
|
|
}
|
|
|
|
|
|
static void
|
|
sendpacket(sessp sp)
|
|
{
|
|
int error = 0;
|
|
struct mbuf *m0 = NULL;
|
|
hook_p hook = sp->hook;
|
|
negp neg = sp->neg;
|
|
priv_p privp = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
|
|
|
|
AAA
|
|
switch(sp->state) {
|
|
case PPPOE_LISTENING:
|
|
case PPPOE_DEAD:
|
|
case PPPOE_SNONE:
|
|
case PPPOE_CONNECTED:
|
|
printf("pppoe: sendpacket: unexpected state\n");
|
|
break;
|
|
|
|
case PPPOE_NEWCONNECTED:
|
|
/* send the PADS without a timeout - we're now connected */
|
|
m0 = m_copypacket(sp->neg->m, M_DONTWAIT);
|
|
NG_SEND_DATA_ONLY( error, privp->ethernet_hook, m0);
|
|
break;
|
|
|
|
case PPPOE_PRIMED:
|
|
/* No packet to send, but set up the timeout */
|
|
neg->timeout_handle = timeout(pppoe_ticker,
|
|
hook, PPPOE_OFFER_TIMEOUT * hz);
|
|
break;
|
|
|
|
case PPPOE_SOFFER:
|
|
/*
|
|
* send the offer but if they don't respond
|
|
* in PPPOE_OFFER_TIMEOUT seconds, forget about it.
|
|
*/
|
|
m0 = m_copypacket(sp->neg->m, M_DONTWAIT);
|
|
NG_SEND_DATA_ONLY( error, privp->ethernet_hook, m0);
|
|
neg->timeout_handle = timeout(pppoe_ticker,
|
|
hook, PPPOE_OFFER_TIMEOUT * hz);
|
|
break;
|
|
|
|
case PPPOE_SINIT:
|
|
case PPPOE_SREQ:
|
|
m0 = m_copypacket(sp->neg->m, M_DONTWAIT);
|
|
NG_SEND_DATA_ONLY( error, privp->ethernet_hook, m0);
|
|
neg->timeout_handle = timeout(pppoe_ticker, hook,
|
|
(hz * PPPOE_INITIAL_TIMEOUT));
|
|
neg->timeout = PPPOE_INITIAL_TIMEOUT * 2;
|
|
break;
|
|
|
|
default:
|
|
error = EINVAL;
|
|
printf("pppoe: timeout: bad state\n");
|
|
}
|
|
/* return (error); */
|
|
}
|
|
|
|
/*
|
|
* Parse an incoming packet to see if any tags should be copied to the
|
|
* output packet. Don't do any tags that have been handled in the main
|
|
* state machine.
|
|
*/
|
|
static const struct pppoe_tag*
|
|
scan_tags(sessp sp, const struct pppoe_hdr* ph)
|
|
{
|
|
const char *const end = (const char *)next_tag(ph);
|
|
const char *ptn;
|
|
const struct pppoe_tag *pt = &ph->tag[0];
|
|
/*
|
|
* Keep processing tags while a tag header will still fit.
|
|
*/
|
|
AAA
|
|
while((const char*)(pt + 1) <= end) {
|
|
/*
|
|
* If the tag data would go past the end of the packet, abort.
|
|
*/
|
|
ptn = (((const char *)(pt + 1)) + ntohs(pt->tag_len));
|
|
if(ptn > end)
|
|
return NULL;
|
|
|
|
switch (pt->tag_type) {
|
|
case PTT_RELAY_SID:
|
|
insert_tag(sp, pt);
|
|
break;
|
|
case PTT_EOL:
|
|
return NULL;
|
|
case PTT_SRV_NAME:
|
|
case PTT_AC_NAME:
|
|
case PTT_HOST_UNIQ:
|
|
case PTT_AC_COOKIE:
|
|
case PTT_VENDOR:
|
|
case PTT_SRV_ERR:
|
|
case PTT_SYS_ERR:
|
|
case PTT_GEN_ERR:
|
|
break;
|
|
}
|
|
pt = (const struct pppoe_tag*)ptn;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static int
|
|
pppoe_send_event(sessp sp, enum cmd cmdid)
|
|
{
|
|
int error;
|
|
struct ng_mesg *msg;
|
|
struct ngpppoe_sts *sts;
|
|
|
|
AAA
|
|
NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, cmdid,
|
|
sizeof(struct ngpppoe_sts), M_NOWAIT);
|
|
if (msg == NULL)
|
|
return (ENOMEM);
|
|
sts = (struct ngpppoe_sts *)msg->data;
|
|
strncpy(sts->hook, NG_HOOK_NAME(sp->hook), NG_HOOKSIZ);
|
|
NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0);
|
|
return (error);
|
|
}
|