This fixes incomplete commit 2e547442ab
New sysctl allows to mark transmitted PPPoE LCP Control
ethernet frames with needed 3-bit Priority Code Point (PCP) value.
Confirming driver like if_vlan(4) uses the value to fill
IEEE 802.1p class of service field.
This is similar to Cisco IOS "control-packets vlan cos priority"
command.
It helps to avoid premature disconnection of user sessions
due to control frame drops (LCP Echo etc.)
if network infrastructure has a botteleck at a switch
or the xdsl DSLAM.
See also:
https://sourceforge.net/p/mpd/discussion/44692/thread/c7abe70e3a/
Tested by: Klaus Fokuhl at SourceForge
MFC after: 2 weeks
2232 lines
59 KiB
C
2232 lines
59 KiB
C
/*
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* ng_pppoe.c
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*/
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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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#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/ktr.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/epoch.h>
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#include <sys/socket.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 <net/if.h>
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#include <net/if_vlan_var.h>
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#include <net/vnet.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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#include <netgraph/ng_ether.h>
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#ifdef NG_SEPARATE_MALLOC
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static 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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/* Some PPP protocol numbers we're interested in */
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#define PROT_LCP 0xc021
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#define SIGNOFF "session closed"
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VNET_DEFINE_STATIC(u_int32_t, ng_pppoe_lcp_pcp) = 0;
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#define V_ng_pppoe_lcp_pcp VNET(ng_pppoe_lcp_pcp)
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SYSCTL_NODE(_net_graph, OID_AUTO, pppoe, CTLFLAG_RW, 0, "PPPoE");
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SYSCTL_UINT(_net_graph_pppoe, OID_AUTO, lcp_pcp,
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CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ng_pppoe_lcp_pcp), 0,
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"Set PCP for LCP");
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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_rcvdata_t ng_pppoe_rcvdata_ether;
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static ng_rcvdata_t ng_pppoe_rcvdata_debug;
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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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{
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NGM_PPPOE_COOKIE,
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NGM_PPPOE_SETMODE,
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"pppoe_setmode",
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&ng_parse_string_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_GETMODE,
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"pppoe_getmode",
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NULL,
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&ng_parse_string_type
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},
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{
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NGM_PPPOE_COOKIE,
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NGM_PPPOE_SETENADDR,
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"setenaddr",
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&ng_parse_enaddr_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_SETMAXP,
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"setmaxp",
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&ng_parse_uint16_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_SEND_HURL,
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"send_hurl",
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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_SEND_MOTM,
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"send_motm",
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&ngpppoe_init_data_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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/*
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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; /* 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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u_int host_uniq_len;
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struct datatag service;
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struct datatag ac_name;
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struct datatag host_uniq;
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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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uint16_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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LIST_ENTRY(sess_con) sessions;
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};
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typedef struct sess_con *sessp;
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#define SESSHASHSIZE 0x0100
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#define SESSHASH(x) (((x) ^ ((x) >> 8)) & (SESSHASHSIZE - 1))
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struct sess_hash_entry {
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struct mtx mtx;
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LIST_HEAD(hhead, sess_con) head;
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};
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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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uint32_t flags;
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#define COMPAT_3COM 0x00000001
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#define COMPAT_DLINK 0x00000002
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struct ether_header eh;
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LIST_HEAD(, sess_con) listeners;
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struct sess_hash_entry sesshash[SESSHASHSIZE];
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struct maxptag max_payload; /* PPP-Max-Payload (RFC4638) */
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};
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typedef struct PPPoE *priv_p;
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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 pppoe_ticker(node_p node, hook_p hook, void *arg1, int arg2);
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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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* 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 + 1))
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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, uint16_t idx)
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{
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const char *const end = (const char *)next_tag(ph);
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const struct pppoe_tag *pt = (const void *)(ph + 1);
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const char *ptn;
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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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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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CTR2(KTR_NET, "%20s: invalid length for tag %d",
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__func__, idx);
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return (NULL);
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}
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if (pt->tag_type == idx) {
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CTR2(KTR_NET, "%20s: found tag %d", __func__, idx);
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return (pt);
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}
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pt = (const struct pppoe_tag*)ptn;
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}
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|
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CTR2(KTR_NET, "%20s: not found tag %d", __func__, idx);
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return (NULL);
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}
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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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KASSERT(sp->neg != NULL, ("%s: no neg", __func__));
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sp->neg->numtags = 0;
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}
|
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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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negp neg = sp->neg;
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int i;
|
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|
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KASSERT(neg != NULL, ("%s: no neg", __func__));
|
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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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log(LOG_NOTICE, "ng_pppoe: asked to add too many tags to "
|
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"packet\n");
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neg->numtags--;
|
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}
|
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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.
|
|
*
|
|
* Assume that the actual pppoe header and ethernet header
|
|
* 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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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;
|
|
uint16_t length = 0;
|
|
|
|
KASSERT((sp->neg != NULL) && (sp->neg->m != NULL),
|
|
("%s: called from wrong state", __func__));
|
|
CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID);
|
|
|
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dp = (char *)(&wh->ph + 1);
|
|
for (count = 0, tag = sp->neg->tags;
|
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((count < sp->neg->numtags) && (count < NUMTAGS));
|
|
tag++, count++) {
|
|
tlen = ntohs((*tag)->tag_len) + sizeof(**tag);
|
|
if ((length + tlen) > (ETHER_MAX_LEN - 4 - sizeof(*wh))) {
|
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log(LOG_NOTICE, "ng_pppoe: tags too long\n");
|
|
sp->neg->numtags = count;
|
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break; /* XXX chop off what's too long */
|
|
}
|
|
bcopy(*tag, (char *)dp, tlen);
|
|
length += tlen;
|
|
dp += tlen;
|
|
}
|
|
wh->ph.length = htons(length);
|
|
sp->neg->m->m_len = length + sizeof(*wh);
|
|
sp->neg->m->m_pkthdr.len = length + sizeof(*wh);
|
|
}
|
|
|
|
/**************************************************************************
|
|
* Routines to match a service. *
|
|
**************************************************************************/
|
|
|
|
/*
|
|
* 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().
|
|
*
|
|
* Null string is a wildcard (ANY service), according to RFC2516.
|
|
* And historical FreeBSD wildcard is also "*".
|
|
*/
|
|
|
|
static hook_p
|
|
pppoe_match_svc(node_p node, const struct pppoe_tag *tag)
|
|
{
|
|
const priv_p privp = NG_NODE_PRIVATE(node);
|
|
sessp sp;
|
|
|
|
LIST_FOREACH(sp, &privp->listeners, sessions) {
|
|
negp neg = sp->neg;
|
|
|
|
/* Empty Service-Name matches any service. */
|
|
if (neg->service_len == 0)
|
|
break;
|
|
|
|
/* Special case for a blank or "*" service name (wildcard). */
|
|
if (neg->service_len == 1 && neg->service.data[0] == '*')
|
|
break;
|
|
|
|
/* If the lengths don't match, that aint it. */
|
|
if (neg->service_len != ntohs(tag->tag_len))
|
|
continue;
|
|
|
|
if (strncmp((const char *)(tag + 1), neg->service.data,
|
|
ntohs(tag->tag_len)) == 0)
|
|
break;
|
|
}
|
|
CTR3(KTR_NET, "%20s: matched %p for %s", __func__,
|
|
sp?sp->hook:NULL, (const char *)(tag + 1));
|
|
|
|
return (sp?sp->hook:NULL);
|
|
}
|
|
|
|
/*
|
|
* Broadcast the PADI packet in m0 to all listening hooks.
|
|
* This routine is called when a PADI with empty Service-Name
|
|
* tag is received. Client should receive PADOs with all
|
|
* available services.
|
|
*/
|
|
static int
|
|
pppoe_broadcast_padi(node_p node, struct mbuf *m0)
|
|
{
|
|
const priv_p privp = NG_NODE_PRIVATE(node);
|
|
sessp sp;
|
|
int error = 0;
|
|
|
|
LIST_FOREACH(sp, &privp->listeners, sessions) {
|
|
struct mbuf *m;
|
|
|
|
m = m_dup(m0, M_NOWAIT);
|
|
if (m == NULL)
|
|
return (ENOMEM);
|
|
NG_SEND_DATA_ONLY(error, sp->hook, m);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Find a hook, which name equals to given service.
|
|
*/
|
|
static hook_p
|
|
pppoe_find_svc(node_p node, const char *svc_name, int svc_len)
|
|
{
|
|
const priv_p privp = NG_NODE_PRIVATE(node);
|
|
sessp sp;
|
|
|
|
LIST_FOREACH(sp, &privp->listeners, sessions) {
|
|
negp neg = sp->neg;
|
|
|
|
if (neg->service_len == svc_len &&
|
|
strncmp(svc_name, neg->service.data, svc_len) == 0)
|
|
return (sp->hook);
|
|
}
|
|
|
|
return (NULL);
|
|
}
|
|
|
|
/**************************************************************************
|
|
* Routines to find a particular session that matches an incoming packet. *
|
|
**************************************************************************/
|
|
/* Find free session and add to hash. */
|
|
static uint16_t
|
|
pppoe_getnewsession(sessp sp)
|
|
{
|
|
const priv_p privp = NG_NODE_PRIVATE(NG_HOOK_NODE(sp->hook));
|
|
static uint16_t pppoe_sid = 1;
|
|
sessp tsp;
|
|
uint16_t val, hash;
|
|
|
|
restart:
|
|
/* Atomicity is not needed here as value will be checked. */
|
|
val = pppoe_sid++;
|
|
/* Spec says 0xFFFF is reserved, also don't use 0x0000. */
|
|
if (val == 0xffff || val == 0x0000)
|
|
val = pppoe_sid = 1;
|
|
|
|
/* Check it isn't already in use. */
|
|
hash = SESSHASH(val);
|
|
mtx_lock(&privp->sesshash[hash].mtx);
|
|
LIST_FOREACH(tsp, &privp->sesshash[hash].head, sessions) {
|
|
if (tsp->Session_ID == val)
|
|
break;
|
|
}
|
|
if (!tsp) {
|
|
sp->Session_ID = val;
|
|
LIST_INSERT_HEAD(&privp->sesshash[hash].head, sp, sessions);
|
|
}
|
|
mtx_unlock(&privp->sesshash[hash].mtx);
|
|
if (tsp)
|
|
goto restart;
|
|
|
|
CTR2(KTR_NET, "%20s: new sid %d", __func__, val);
|
|
|
|
return (val);
|
|
}
|
|
|
|
/* Add specified session to hash. */
|
|
static void
|
|
pppoe_addsession(sessp sp)
|
|
{
|
|
const priv_p privp = NG_NODE_PRIVATE(NG_HOOK_NODE(sp->hook));
|
|
uint16_t hash = SESSHASH(sp->Session_ID);
|
|
|
|
mtx_lock(&privp->sesshash[hash].mtx);
|
|
LIST_INSERT_HEAD(&privp->sesshash[hash].head, sp, sessions);
|
|
mtx_unlock(&privp->sesshash[hash].mtx);
|
|
}
|
|
|
|
/* Delete specified session from hash. */
|
|
static void
|
|
pppoe_delsession(sessp sp)
|
|
{
|
|
const priv_p privp = NG_NODE_PRIVATE(NG_HOOK_NODE(sp->hook));
|
|
uint16_t hash = SESSHASH(sp->Session_ID);
|
|
|
|
mtx_lock(&privp->sesshash[hash].mtx);
|
|
LIST_REMOVE(sp, sessions);
|
|
mtx_unlock(&privp->sesshash[hash].mtx);
|
|
}
|
|
|
|
/* Find matching peer/session combination. */
|
|
static sessp
|
|
pppoe_findsession(priv_p privp, const struct pppoe_full_hdr *wh)
|
|
{
|
|
uint16_t session = ntohs(wh->ph.sid);
|
|
uint16_t hash = SESSHASH(session);
|
|
sessp sp = NULL;
|
|
|
|
mtx_lock(&privp->sesshash[hash].mtx);
|
|
LIST_FOREACH(sp, &privp->sesshash[hash].head, sessions) {
|
|
if (sp->Session_ID == session &&
|
|
bcmp(sp->pkt_hdr.eh.ether_dhost,
|
|
wh->eh.ether_shost, ETHER_ADDR_LEN) == 0) {
|
|
break;
|
|
}
|
|
}
|
|
mtx_unlock(&privp->sesshash[hash].mtx);
|
|
CTR3(KTR_NET, "%20s: matched %p for %d", __func__, sp?sp->hook:NULL,
|
|
session);
|
|
|
|
return (sp);
|
|
}
|
|
|
|
static hook_p
|
|
pppoe_finduniq(node_p node, const struct pppoe_tag *tag)
|
|
{
|
|
hook_p hook = NULL;
|
|
sessp sp;
|
|
|
|
/* Cycle through all known hooks. */
|
|
LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) {
|
|
/* Skip any nonsession hook. */
|
|
if (NG_HOOK_PRIVATE(hook) == NULL)
|
|
continue;
|
|
sp = NG_HOOK_PRIVATE(hook);
|
|
/* Skip already connected sessions. */
|
|
if (sp->neg == NULL)
|
|
continue;
|
|
if (sp->neg->host_uniq_len == ntohs(tag->tag_len) &&
|
|
bcmp(sp->neg->host_uniq.data, (const char *)(tag + 1),
|
|
sp->neg->host_uniq_len) == 0)
|
|
break;
|
|
}
|
|
CTR3(KTR_NET, "%20s: matched %p for %p", __func__, hook, sp);
|
|
|
|
return (hook);
|
|
}
|
|
|
|
static hook_p
|
|
pppoe_findcookie(node_p node, const struct pppoe_tag *tag)
|
|
{
|
|
hook_p hook = NULL;
|
|
union uniq cookie;
|
|
|
|
bcopy(tag + 1, cookie.bytes, sizeof(void *));
|
|
/* Cycle through all known hooks. */
|
|
LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) {
|
|
/* Skip any nonsession hook. */
|
|
if (NG_HOOK_PRIVATE(hook) == NULL)
|
|
continue;
|
|
if (cookie.pointer == NG_HOOK_PRIVATE(hook))
|
|
break;
|
|
}
|
|
CTR3(KTR_NET, "%20s: matched %p for %p", __func__, hook, cookie.pointer);
|
|
|
|
return (hook);
|
|
}
|
|
|
|
/**************************************************************************
|
|
* Start of Netgraph entrypoints. *
|
|
**************************************************************************/
|
|
|
|
/*
|
|
* Allocate the private data structure and link it with node.
|
|
*/
|
|
static int
|
|
ng_pppoe_constructor(node_p node)
|
|
{
|
|
priv_p privp;
|
|
int i;
|
|
|
|
/* Initialize private descriptor. */
|
|
privp = malloc(sizeof(*privp), M_NETGRAPH_PPPOE, M_WAITOK | M_ZERO);
|
|
|
|
/* Link structs together; this counts as our one reference to *node. */
|
|
NG_NODE_SET_PRIVATE(node, privp);
|
|
privp->node = node;
|
|
|
|
/* Initialize to standard mode. */
|
|
memset(&privp->eh.ether_dhost, 0xff, ETHER_ADDR_LEN);
|
|
privp->eh.ether_type = ETHERTYPE_PPPOE_DISC;
|
|
|
|
LIST_INIT(&privp->listeners);
|
|
for (i = 0; i < SESSHASHSIZE; i++) {
|
|
mtx_init(&privp->sesshash[i].mtx, "PPPoE hash mutex", NULL, MTX_DEF);
|
|
LIST_INIT(&privp->sesshash[i].head);
|
|
}
|
|
|
|
CTR3(KTR_NET, "%20s: created node [%x] (%p)",
|
|
__func__, node->nd_ID, 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;
|
|
|
|
if (strcmp(name, NG_PPPOE_HOOK_ETHERNET) == 0) {
|
|
privp->ethernet_hook = hook;
|
|
NG_HOOK_SET_RCVDATA(hook, ng_pppoe_rcvdata_ether);
|
|
} else if (strcmp(name, NG_PPPOE_HOOK_DEBUG) == 0) {
|
|
privp->debug_hook = hook;
|
|
NG_HOOK_SET_RCVDATA(hook, ng_pppoe_rcvdata_debug);
|
|
} else {
|
|
/*
|
|
* Any other unique name is OK.
|
|
* The infrastructure has already checked that it's unique,
|
|
* so just allocate it and hook it in.
|
|
*/
|
|
sp = malloc(sizeof(*sp), M_NETGRAPH_PPPOE, M_NOWAIT | M_ZERO);
|
|
if (sp == NULL)
|
|
return (ENOMEM);
|
|
|
|
NG_HOOK_SET_PRIVATE(hook, sp);
|
|
sp->hook = hook;
|
|
}
|
|
CTR5(KTR_NET, "%20s: node [%x] (%p) connected hook %s (%p)",
|
|
__func__, node->nd_ID, node, name, hook);
|
|
|
|
return(0);
|
|
}
|
|
|
|
/*
|
|
* Hook has been added successfully. Request the MAC address of
|
|
* the underlying Ethernet node.
|
|
*/
|
|
static int
|
|
ng_pppoe_connect(hook_p hook)
|
|
{
|
|
const priv_p privp = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
|
|
struct ng_mesg *msg;
|
|
int error;
|
|
|
|
if (hook != privp->ethernet_hook)
|
|
return (0);
|
|
|
|
/*
|
|
* If this is Ethernet hook, then request MAC address
|
|
* from our downstream.
|
|
*/
|
|
NG_MKMESSAGE(msg, NGM_ETHER_COOKIE, NGM_ETHER_GET_ENADDR, 0, M_NOWAIT);
|
|
if (msg == NULL)
|
|
return (ENOBUFS);
|
|
|
|
/*
|
|
* Our hook and peer hook have HK_INVALID flag set,
|
|
* so we can't use NG_SEND_MSG_HOOK() macro here.
|
|
*/
|
|
NG_SEND_MSG_ID(error, privp->node, msg,
|
|
NG_NODE_ID(NG_PEER_NODE(privp->ethernet_hook)),
|
|
NG_NODE_ID(privp->node));
|
|
|
|
return (error);
|
|
}
|
|
/*
|
|
* 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)
|
|
{
|
|
struct epoch_tracker et;
|
|
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;
|
|
|
|
NGI_GET_MSG(item, msg);
|
|
CTR5(KTR_NET, "%20s: node [%x] (%p) got message %d with cookie %d",
|
|
__func__, node->nd_ID, node, msg->header.cmd,
|
|
msg->header.typecookie);
|
|
|
|
/* 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:
|
|
case NGM_PPPOE_SEND_HURL:
|
|
case NGM_PPPOE_SEND_MOTM:
|
|
ourmsg = (struct ngpppoe_init_data *)msg->data;
|
|
if (msg->header.arglen < sizeof(*ourmsg)) {
|
|
log(LOG_ERR, "ng_pppoe[%x]: init data too "
|
|
"small\n", node->nd_ID);
|
|
LEAVE(EMSGSIZE);
|
|
}
|
|
if (msg->header.cmd == NGM_PPPOE_SEND_HURL ||
|
|
msg->header.cmd == NGM_PPPOE_SEND_MOTM) {
|
|
if (msg->header.arglen - sizeof(*ourmsg) >
|
|
PPPOE_PADM_VALUE_SIZE) {
|
|
log(LOG_ERR, "ng_pppoe[%x]: message "
|
|
"too big\n", node->nd_ID);
|
|
LEAVE(EMSGSIZE);
|
|
}
|
|
} else {
|
|
if (msg->header.arglen - sizeof(*ourmsg) >
|
|
PPPOE_SERVICE_NAME_SIZE) {
|
|
log(LOG_ERR, "ng_pppoe[%x]: service name "
|
|
"too big\n", node->nd_ID);
|
|
LEAVE(EMSGSIZE);
|
|
}
|
|
}
|
|
if (msg->header.arglen - sizeof(*ourmsg) <
|
|
ourmsg->data_len) {
|
|
log(LOG_ERR, "ng_pppoe[%x]: init data has bad "
|
|
"length, %d should be %zd\n", node->nd_ID,
|
|
ourmsg->data_len,
|
|
msg->header.arglen - sizeof (*ourmsg));
|
|
LEAVE(EMSGSIZE);
|
|
}
|
|
|
|
/* Make sure strcmp will terminate safely. */
|
|
ourmsg->hook[sizeof(ourmsg->hook) - 1] = '\0';
|
|
|
|
/* Find hook by name. */
|
|
hook = ng_findhook(node, ourmsg->hook);
|
|
if (hook == NULL)
|
|
LEAVE(ENOENT);
|
|
|
|
sp = NG_HOOK_PRIVATE(hook);
|
|
if (sp == NULL)
|
|
LEAVE(EINVAL);
|
|
|
|
if (msg->header.cmd == NGM_PPPOE_LISTEN) {
|
|
/*
|
|
* Ensure we aren't already listening for this
|
|
* service.
|
|
*/
|
|
if (pppoe_find_svc(node, ourmsg->data,
|
|
ourmsg->data_len) != NULL)
|
|
LEAVE(EEXIST);
|
|
}
|
|
|
|
/*
|
|
* PPPOE_SERVICE advertisements are set up
|
|
* on sessions that are in PRIMED state.
|
|
*/
|
|
if (msg->header.cmd == NGM_PPPOE_SERVICE)
|
|
break;
|
|
|
|
/*
|
|
* PADM messages are set up on active sessions.
|
|
*/
|
|
if (msg->header.cmd == NGM_PPPOE_SEND_HURL ||
|
|
msg->header.cmd == NGM_PPPOE_SEND_MOTM) {
|
|
if (sp->state != PPPOE_NEWCONNECTED &&
|
|
sp->state != PPPOE_CONNECTED) {
|
|
log(LOG_NOTICE, "ng_pppoe[%x]: session is not "
|
|
"active\n", node->nd_ID);
|
|
LEAVE(EISCONN);
|
|
}
|
|
break;
|
|
}
|
|
|
|
if (sp->state != PPPOE_SNONE) {
|
|
log(LOG_NOTICE, "ng_pppoe[%x]: Session already "
|
|
"active\n", node->nd_ID);
|
|
LEAVE(EISCONN);
|
|
}
|
|
|
|
/*
|
|
* Set up prototype header.
|
|
*/
|
|
neg = malloc(sizeof(*neg), M_NETGRAPH_PPPOE,
|
|
M_NOWAIT | M_ZERO);
|
|
|
|
if (neg == NULL)
|
|
LEAVE(ENOMEM);
|
|
|
|
neg->m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
|
|
if (neg->m == NULL) {
|
|
free(neg, M_NETGRAPH_PPPOE);
|
|
LEAVE(ENOBUFS);
|
|
}
|
|
neg->m->m_pkthdr.rcvif = NULL;
|
|
sp->neg = neg;
|
|
ng_callout_init(&neg->handle);
|
|
neg->m->m_len = sizeof(struct pppoe_full_hdr);
|
|
neg->pkt = mtod(neg->m, union packet*);
|
|
memcpy((void *)&neg->pkt->pkt_header.eh,
|
|
&privp->eh, sizeof(struct ether_header));
|
|
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 or fail message to them later.
|
|
* Move the session to SINIT.
|
|
* Set up the session to the correct state and
|
|
* start it.
|
|
*/
|
|
int acnpos, acnlen = 0, acnsep = 0;
|
|
int hupos, hulen = 0, husep = 0;
|
|
int i, srvpos, srvlen;
|
|
acnpos = 0;
|
|
for (i = 0; i < ourmsg->data_len; i++) {
|
|
if (ourmsg->data[i] == '\\') {
|
|
acnlen = i;
|
|
acnsep = 1;
|
|
break;
|
|
}
|
|
}
|
|
hupos = acnlen + acnsep;
|
|
for (i = hupos; i < ourmsg->data_len; i++) {
|
|
if (ourmsg->data[i] == '|') {
|
|
hulen = i - hupos;
|
|
husep = 1;
|
|
break;
|
|
}
|
|
}
|
|
srvpos = hupos + hulen + husep;
|
|
srvlen = ourmsg->data_len - srvpos;
|
|
|
|
bcopy(ourmsg->data + acnpos, neg->ac_name.data, acnlen);
|
|
neg->ac_name_len = acnlen;
|
|
|
|
neg->host_uniq.hdr.tag_type = PTT_HOST_UNIQ;
|
|
if (hulen == 0) {
|
|
/* Not provided, generate one */
|
|
neg->host_uniq.hdr.tag_len = htons(sizeof(sp));
|
|
bcopy(&sp, neg->host_uniq.data, sizeof(sp));
|
|
neg->host_uniq_len = sizeof(sp);
|
|
} else if (hulen > 2 && ourmsg->data[hupos] == '0' &&
|
|
ourmsg->data[hupos + 1] == 'x' && hulen % 2 == 0) {
|
|
/* Hex encoded */
|
|
static const char hexdig[16] = "0123456789abcdef";
|
|
int j;
|
|
|
|
neg->host_uniq.hdr.tag_len = htons((uint16_t)(hulen / 2 - 1));
|
|
for (i = 0; i < hulen - 2; i++) {
|
|
for (j = 0;
|
|
j < 16 &&
|
|
ourmsg->data[hupos + 2 + i] != hexdig[j];
|
|
j++);
|
|
if (j == 16)
|
|
LEAVE(EINVAL);
|
|
if (i % 2 == 0)
|
|
neg->host_uniq.data[i / 2] = j << 4;
|
|
else
|
|
neg->host_uniq.data[i / 2] |= j;
|
|
}
|
|
neg->host_uniq_len = hulen / 2 - 1;
|
|
} else {
|
|
/* Plain string */
|
|
neg->host_uniq.hdr.tag_len = htons((uint16_t)hulen);
|
|
bcopy(ourmsg->data + hupos, neg->host_uniq.data, hulen);
|
|
neg->host_uniq_len = hulen;
|
|
}
|
|
|
|
neg->service.hdr.tag_type = PTT_SRV_NAME;
|
|
neg->service.hdr.tag_len = htons((uint16_t)srvlen);
|
|
bcopy(ourmsg->data + srvpos, neg->service.data, srvlen);
|
|
neg->service_len = srvlen;
|
|
NET_EPOCH_ENTER(et);
|
|
pppoe_start(sp);
|
|
NET_EPOCH_EXIT(et);
|
|
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 or fail message to them later.
|
|
* Move the hook to 'LISTENING'
|
|
*/
|
|
neg->service.hdr.tag_type = PTT_SRV_NAME;
|
|
neg->service.hdr.tag_len =
|
|
htons((uint16_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;
|
|
LIST_INSERT_HEAD(&privp->listeners, sp, sessions);
|
|
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((uint16_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) {
|
|
log(LOG_NOTICE, "ng_pppoe[%x]: session not "
|
|
"primed\n", node->nd_ID);
|
|
LEAVE(EISCONN);
|
|
}
|
|
neg = sp->neg;
|
|
neg->service.hdr.tag_type = PTT_SRV_NAME;
|
|
neg->service.hdr.tag_len =
|
|
htons((uint16_t)ourmsg->data_len);
|
|
|
|
if (ourmsg->data_len)
|
|
bcopy(ourmsg->data, neg->service.data,
|
|
ourmsg->data_len);
|
|
neg->service_len = ourmsg->data_len;
|
|
break;
|
|
case NGM_PPPOE_SETMODE:
|
|
{
|
|
char *s;
|
|
size_t len;
|
|
|
|
if (msg->header.arglen == 0)
|
|
LEAVE(EINVAL);
|
|
|
|
s = (char *)msg->data;
|
|
len = msg->header.arglen - 1;
|
|
|
|
/* Search for matching mode string. */
|
|
if (len == strlen(NG_PPPOE_STANDARD) &&
|
|
(strncmp(NG_PPPOE_STANDARD, s, len) == 0)) {
|
|
privp->flags = 0;
|
|
privp->eh.ether_type = ETHERTYPE_PPPOE_DISC;
|
|
break;
|
|
}
|
|
if (len == strlen(NG_PPPOE_3COM) &&
|
|
(strncmp(NG_PPPOE_3COM, s, len) == 0)) {
|
|
privp->flags |= COMPAT_3COM;
|
|
privp->eh.ether_type =
|
|
ETHERTYPE_PPPOE_3COM_DISC;
|
|
break;
|
|
}
|
|
if (len == strlen(NG_PPPOE_DLINK) &&
|
|
(strncmp(NG_PPPOE_DLINK, s, len) == 0)) {
|
|
privp->flags |= COMPAT_DLINK;
|
|
break;
|
|
}
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
case NGM_PPPOE_GETMODE:
|
|
{
|
|
char *s;
|
|
size_t len = 0;
|
|
|
|
if (privp->flags == 0)
|
|
len += strlen(NG_PPPOE_STANDARD) + 1;
|
|
if (privp->flags & COMPAT_3COM)
|
|
len += strlen(NG_PPPOE_3COM) + 1;
|
|
if (privp->flags & COMPAT_DLINK)
|
|
len += strlen(NG_PPPOE_DLINK) + 1;
|
|
|
|
NG_MKRESPONSE(resp, msg, len, M_NOWAIT);
|
|
if (resp == NULL)
|
|
LEAVE(ENOMEM);
|
|
|
|
s = (char *)resp->data;
|
|
if (privp->flags == 0) {
|
|
len = strlen(NG_PPPOE_STANDARD);
|
|
strlcpy(s, NG_PPPOE_STANDARD, len + 1);
|
|
break;
|
|
}
|
|
if (privp->flags & COMPAT_3COM) {
|
|
len = strlen(NG_PPPOE_3COM);
|
|
strlcpy(s, NG_PPPOE_3COM, len + 1);
|
|
s += len;
|
|
}
|
|
if (privp->flags & COMPAT_DLINK) {
|
|
if (s != resp->data)
|
|
*s++ = '|';
|
|
len = strlen(NG_PPPOE_DLINK);
|
|
strlcpy(s, NG_PPPOE_DLINK, len + 1);
|
|
}
|
|
break;
|
|
}
|
|
case NGM_PPPOE_SETENADDR:
|
|
if (msg->header.arglen != ETHER_ADDR_LEN)
|
|
LEAVE(EINVAL);
|
|
bcopy(msg->data, &privp->eh.ether_shost,
|
|
ETHER_ADDR_LEN);
|
|
break;
|
|
case NGM_PPPOE_SETMAXP:
|
|
if (msg->header.arglen != sizeof(uint16_t))
|
|
LEAVE(EINVAL);
|
|
privp->max_payload.hdr.tag_type = PTT_MAX_PAYL;
|
|
privp->max_payload.hdr.tag_len = htons(sizeof(uint16_t));
|
|
privp->max_payload.data = htons(*((uint16_t *)msg->data));
|
|
break;
|
|
case NGM_PPPOE_SEND_HURL:
|
|
{
|
|
struct mbuf *m;
|
|
|
|
/* Generate a packet of that type. */
|
|
m = m_gethdr(M_NOWAIT, MT_DATA);
|
|
if (m == NULL)
|
|
log(LOG_NOTICE, "ng_pppoe[%x]: session out of "
|
|
"mbufs\n", node->nd_ID);
|
|
else {
|
|
struct pppoe_full_hdr *wh;
|
|
struct pppoe_tag *tag;
|
|
int error = 0;
|
|
|
|
wh = mtod(m, struct pppoe_full_hdr *);
|
|
bcopy(&sp->pkt_hdr, wh, sizeof(*wh));
|
|
|
|
/* Revert the stored header to DISC/PADM mode. */
|
|
wh->ph.code = PADM_CODE;
|
|
/*
|
|
* Configure ethertype depending on what
|
|
* was used during sessions stage.
|
|
*/
|
|
if (wh->eh.ether_type ==
|
|
ETHERTYPE_PPPOE_3COM_SESS)
|
|
wh->eh.ether_type = ETHERTYPE_PPPOE_3COM_DISC;
|
|
else
|
|
wh->eh.ether_type = ETHERTYPE_PPPOE_DISC;
|
|
/*
|
|
* Add PADM message and adjust sizes.
|
|
*/
|
|
tag = (void *)(&wh->ph + 1);
|
|
tag->tag_type = PTT_HURL;
|
|
tag->tag_len = htons(ourmsg->data_len);
|
|
strncpy((char *)(tag + 1), ourmsg->data, ourmsg->data_len);
|
|
m->m_pkthdr.len = m->m_len = sizeof(*wh) + sizeof(*tag) +
|
|
ourmsg->data_len;
|
|
wh->ph.length = htons(sizeof(*tag) + ourmsg->data_len);
|
|
NET_EPOCH_ENTER(et);
|
|
NG_SEND_DATA_ONLY(error,
|
|
privp->ethernet_hook, m);
|
|
NET_EPOCH_EXIT(et);
|
|
}
|
|
break;
|
|
}
|
|
case NGM_PPPOE_SEND_MOTM:
|
|
{
|
|
struct mbuf *m;
|
|
|
|
/* Generate a packet of that type. */
|
|
m = m_gethdr(M_NOWAIT, MT_DATA);
|
|
if (m == NULL)
|
|
log(LOG_NOTICE, "ng_pppoe[%x]: session out of "
|
|
"mbufs\n", node->nd_ID);
|
|
else {
|
|
struct pppoe_full_hdr *wh;
|
|
struct pppoe_tag *tag;
|
|
int error = 0;
|
|
|
|
wh = mtod(m, struct pppoe_full_hdr *);
|
|
bcopy(&sp->pkt_hdr, wh, sizeof(*wh));
|
|
|
|
/* Revert the stored header to DISC/PADM mode. */
|
|
wh->ph.code = PADM_CODE;
|
|
/*
|
|
* Configure ethertype depending on what
|
|
* was used during sessions stage.
|
|
*/
|
|
if (wh->eh.ether_type ==
|
|
ETHERTYPE_PPPOE_3COM_SESS)
|
|
wh->eh.ether_type = ETHERTYPE_PPPOE_3COM_DISC;
|
|
else
|
|
wh->eh.ether_type = ETHERTYPE_PPPOE_DISC;
|
|
/*
|
|
* Add PADM message and adjust sizes.
|
|
*/
|
|
tag = (void *)(&wh->ph + 1);
|
|
tag->tag_type = PTT_MOTM;
|
|
tag->tag_len = htons(ourmsg->data_len);
|
|
strncpy((char *)(tag + 1), ourmsg->data, ourmsg->data_len);
|
|
m->m_pkthdr.len = m->m_len = sizeof(*wh) + sizeof(*tag) +
|
|
ourmsg->data_len;
|
|
wh->ph.length = htons(sizeof(*tag) + ourmsg->data_len);
|
|
NET_EPOCH_ENTER(et);
|
|
NG_SEND_DATA_ONLY(error,
|
|
privp->ethernet_hook, m);
|
|
NET_EPOCH_EXIT(et);
|
|
}
|
|
break;
|
|
}
|
|
default:
|
|
LEAVE(EINVAL);
|
|
}
|
|
break;
|
|
case NGM_ETHER_COOKIE:
|
|
if (!(msg->header.flags & NGF_RESP))
|
|
LEAVE(EINVAL);
|
|
switch (msg->header.cmd) {
|
|
case NGM_ETHER_GET_ENADDR:
|
|
if (msg->header.arglen != ETHER_ADDR_LEN)
|
|
LEAVE(EINVAL);
|
|
bcopy(msg->data, &privp->eh.ether_shost,
|
|
ETHER_ADDR_LEN);
|
|
break;
|
|
default:
|
|
LEAVE(EINVAL);
|
|
}
|
|
break;
|
|
default:
|
|
LEAVE(EINVAL);
|
|
}
|
|
|
|
/* Take care of synchronous response, if any. */
|
|
quit:
|
|
CTR2(KTR_NET, "%20s: returning %d", __func__, error);
|
|
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)
|
|
{
|
|
hook_p hook = sp->hook;
|
|
node_p node = NG_HOOK_NODE(hook);
|
|
priv_p privp = NG_NODE_PRIVATE(node);
|
|
negp neg = sp->neg;
|
|
struct mbuf *m0;
|
|
int error;
|
|
|
|
/*
|
|
* Kick the state machine into starting up.
|
|
*/
|
|
CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID);
|
|
sp->state = PPPOE_SINIT;
|
|
/*
|
|
* Reset the packet header to broadcast. Since we are
|
|
* in a client mode use configured ethertype.
|
|
*/
|
|
memcpy((void *)&neg->pkt->pkt_header.eh, &privp->eh,
|
|
sizeof(struct ether_header));
|
|
neg->pkt->pkt_header.ph.code = PADI_CODE;
|
|
init_tags(sp);
|
|
insert_tag(sp, &neg->host_uniq.hdr);
|
|
insert_tag(sp, &neg->service.hdr);
|
|
if (privp->max_payload.data != 0)
|
|
insert_tag(sp, &privp->max_payload.hdr);
|
|
make_packet(sp);
|
|
/*
|
|
* Send packet and prepare to retransmit it after timeout.
|
|
*/
|
|
ng_callout(&neg->handle, node, hook, PPPOE_INITIAL_TIMEOUT * hz,
|
|
pppoe_ticker, NULL, 0);
|
|
neg->timeout = PPPOE_INITIAL_TIMEOUT * 2;
|
|
m0 = m_copypacket(neg->m, M_NOWAIT);
|
|
NG_SEND_DATA_ONLY(error, privp->ethernet_hook, m0);
|
|
}
|
|
|
|
static int
|
|
send_acname(sessp sp, const struct pppoe_tag *tag)
|
|
{
|
|
int error, tlen;
|
|
struct ng_mesg *msg;
|
|
struct ngpppoe_sts *sts;
|
|
|
|
CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID);
|
|
|
|
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, (const char *)(tag + 1), 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;
|
|
|
|
CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID);
|
|
|
|
NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_SESSIONID,
|
|
sizeof(uint16_t), M_NOWAIT);
|
|
if (msg == NULL)
|
|
return (ENOMEM);
|
|
|
|
*(uint16_t *)msg->data = sp->Session_ID;
|
|
NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0);
|
|
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
send_maxp(sessp sp, const struct pppoe_tag *tag)
|
|
{
|
|
int error;
|
|
struct ng_mesg *msg;
|
|
struct ngpppoe_maxp *maxp;
|
|
|
|
CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID);
|
|
|
|
NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_SETMAXP,
|
|
sizeof(struct ngpppoe_maxp), M_NOWAIT);
|
|
if (msg == NULL)
|
|
return (ENOMEM);
|
|
|
|
maxp = (struct ngpppoe_maxp *)msg->data;
|
|
strncpy(maxp->hook, NG_HOOK_NAME(sp->hook), NG_HOOKSIZ);
|
|
maxp->data = ntohs(((const struct maxptag *)tag)->data);
|
|
NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0);
|
|
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
send_hurl(sessp sp, const struct pppoe_tag *tag)
|
|
{
|
|
int error, tlen;
|
|
struct ng_mesg *msg;
|
|
struct ngpppoe_padm *padm;
|
|
|
|
CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID);
|
|
|
|
NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_HURL,
|
|
sizeof(struct ngpppoe_padm), M_NOWAIT);
|
|
if (msg == NULL)
|
|
return (ENOMEM);
|
|
|
|
padm = (struct ngpppoe_padm *)msg->data;
|
|
tlen = min(PPPOE_PADM_VALUE_SIZE - 1, ntohs(tag->tag_len));
|
|
strncpy(padm->msg, (const char *)(tag + 1), tlen);
|
|
padm->msg[tlen] = '\0';
|
|
NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0);
|
|
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
send_motm(sessp sp, const struct pppoe_tag *tag)
|
|
{
|
|
int error, tlen;
|
|
struct ng_mesg *msg;
|
|
struct ngpppoe_padm *padm;
|
|
|
|
CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID);
|
|
|
|
NG_MKMESSAGE(msg, NGM_PPPOE_COOKIE, NGM_PPPOE_MOTM,
|
|
sizeof(struct ngpppoe_padm), M_NOWAIT);
|
|
if (msg == NULL)
|
|
return (ENOMEM);
|
|
|
|
padm = (struct ngpppoe_padm *)msg->data;
|
|
tlen = min(PPPOE_PADM_VALUE_SIZE - 1, ntohs(tag->tag_len));
|
|
strncpy(padm->msg, (const char *)(tag + 1), tlen);
|
|
padm->msg[tlen] = '\0';
|
|
NG_SEND_MSG_ID(error, NG_HOOK_NODE(sp->hook), msg, sp->creator, 0);
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Receive data from session hook and do something with 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);
|
|
struct pppoe_full_hdr *wh;
|
|
struct mbuf *m;
|
|
int error;
|
|
|
|
CTR6(KTR_NET, "%20s: node [%x] (%p) received %p on \"%s\" (%p)",
|
|
__func__, node->nd_ID, node, item, hook->hk_name, hook);
|
|
|
|
NGI_GET_M(item, m);
|
|
switch (sp->state) {
|
|
case PPPOE_NEWCONNECTED:
|
|
case PPPOE_CONNECTED: {
|
|
/*
|
|
* 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 (mtod(m, u_char *)[0] == 0xff &&
|
|
mtod(m, u_char *)[1] == 0x03)
|
|
m_adj(m, 2);
|
|
}
|
|
|
|
if (V_ng_pppoe_lcp_pcp && m->m_pkthdr.len >= 2 &&
|
|
m->m_len >= 2 && (m = m_pullup(m, 2)) &&
|
|
mtod(m, uint16_t *)[0] == htons(PROT_LCP))
|
|
EVL_APPLY_PRI(m, (uint8_t)(V_ng_pppoe_lcp_pcp & 0x7));
|
|
|
|
/*
|
|
* Bang in a pre-made header, and set the length up
|
|
* to be correct. Then send it to the ethernet driver.
|
|
*/
|
|
M_PREPEND(m, sizeof(*wh), M_NOWAIT);
|
|
if (m == NULL)
|
|
LEAVE(ENOBUFS);
|
|
|
|
wh = mtod(m, struct pppoe_full_hdr *);
|
|
bcopy(&sp->pkt_hdr, wh, sizeof(*wh));
|
|
wh->ph.length = htons(m->m_pkthdr.len - sizeof(*wh));
|
|
NG_FWD_NEW_DATA(error, item, privp->ethernet_hook, m);
|
|
privp->packets_out++;
|
|
break;
|
|
}
|
|
case PPPOE_PRIMED: {
|
|
struct {
|
|
struct pppoe_tag hdr;
|
|
union uniq data;
|
|
} __packed uniqtag;
|
|
const struct pppoe_tag *tag;
|
|
struct mbuf *m0;
|
|
const struct pppoe_hdr *ph;
|
|
negp neg = sp->neg;
|
|
uint8_t code;
|
|
|
|
/*
|
|
* A PADI packet is being returned by the application
|
|
* that has set up this hook. This indicates that it
|
|
* wants us to offer service.
|
|
*/
|
|
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;
|
|
code = wh->ph.code;
|
|
/* Use peers mode in session. */
|
|
neg->pkt->pkt_header.eh.ether_type = wh->eh.ether_type;
|
|
if (code != PADI_CODE)
|
|
LEAVE(EINVAL);
|
|
ng_uncallout(&neg->handle, node);
|
|
|
|
/*
|
|
* 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);
|
|
/*
|
|
* Send the offer but if they don't respond
|
|
* in PPPOE_OFFER_TIMEOUT seconds, forget about it.
|
|
*/
|
|
ng_callout(&neg->handle, node, hook, PPPOE_OFFER_TIMEOUT * hz,
|
|
pppoe_ticker, NULL, 0);
|
|
m0 = m_copypacket(sp->neg->m, M_NOWAIT);
|
|
NG_FWD_NEW_DATA(error, item, privp->ethernet_hook, m0);
|
|
privp->packets_out++;
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* Packets coming from the hook make no sense
|
|
* to sessions in the rest of states. Throw them away.
|
|
*/
|
|
default:
|
|
LEAVE(ENETUNREACH);
|
|
}
|
|
quit:
|
|
if (item)
|
|
NG_FREE_ITEM(item);
|
|
NG_FREE_M(m);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Receive data from ether and do something with it.
|
|
*/
|
|
static int
|
|
ng_pppoe_rcvdata_ether(hook_p hook, item_p item)
|
|
{
|
|
node_p node = NG_HOOK_NODE(hook);
|
|
const priv_p privp = NG_NODE_PRIVATE(node);
|
|
sessp sp;
|
|
const struct pppoe_tag *utag = NULL, *tag = NULL;
|
|
const struct pppoe_tag sntag = { PTT_SRV_NAME, 0 };
|
|
const struct pppoe_full_hdr *wh;
|
|
const struct pppoe_hdr *ph;
|
|
negp neg = NULL;
|
|
struct mbuf *m;
|
|
hook_p sendhook;
|
|
int error = 0;
|
|
uint16_t length;
|
|
uint8_t code;
|
|
struct mbuf *m0;
|
|
|
|
CTR6(KTR_NET, "%20s: node [%x] (%p) received %p on \"%s\" (%p)",
|
|
__func__, node->nd_ID, node, item, hook->hk_name, hook);
|
|
|
|
NGI_GET_M(item, m);
|
|
/*
|
|
* 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) {
|
|
log(LOG_NOTICE, "ng_pppoe[%x]: couldn't "
|
|
"m_pullup(wh)\n", node->nd_ID);
|
|
LEAVE(ENOBUFS);
|
|
}
|
|
}
|
|
wh = mtod(m, struct pppoe_full_hdr *);
|
|
length = ntohs(wh->ph.length);
|
|
switch(wh->eh.ether_type) {
|
|
case ETHERTYPE_PPPOE_3COM_DISC: /* 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) {
|
|
log(LOG_NOTICE, "ng_pppoe[%x]: "
|
|
"couldn't m_pullup(pkthdr)\n",
|
|
node->nd_ID);
|
|
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_NOWAIT);
|
|
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) {
|
|
log(LOG_NOTICE, "ng_pppoe[%x]: packet "
|
|
"fragmented\n", node->nd_ID);
|
|
LEAVE(EMSGSIZE);
|
|
}
|
|
}
|
|
wh = mtod(m, struct pppoe_full_hdr *);
|
|
length = ntohs(wh->ph.length);
|
|
ph = &wh->ph;
|
|
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)
|
|
tag = &sntag;
|
|
|
|
/*
|
|
* First, try to match Service-Name against our
|
|
* listening hooks. If no success and we are in D-Link
|
|
* compat mode and Service-Name is empty, then we
|
|
* broadcast the PADI to all listening hooks.
|
|
*/
|
|
sendhook = pppoe_match_svc(node, tag);
|
|
if (sendhook != NULL)
|
|
NG_FWD_NEW_DATA(error, item, sendhook, m);
|
|
else if (privp->flags & COMPAT_DLINK &&
|
|
ntohs(tag->tag_len) == 0)
|
|
error = pppoe_broadcast_padi(node, m);
|
|
else
|
|
error = 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) {
|
|
log(LOG_NOTICE, "ng_pppoe[%x]: no host "
|
|
"unique field\n", node->nd_ID);
|
|
LEAVE(ENETUNREACH);
|
|
}
|
|
|
|
sendhook = pppoe_finduniq(node, utag);
|
|
if (sendhook == NULL) {
|
|
log(LOG_NOTICE, "ng_pppoe[%x]: no "
|
|
"matching session\n", node->nd_ID);
|
|
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_SREQ ||
|
|
sp->state == PPPOE_CONNECTED) {
|
|
break; /* Multiple PADO is OK. */
|
|
}
|
|
if (sp->state != PPPOE_SINIT) {
|
|
log(LOG_NOTICE, "ng_pppoe[%x]: session "
|
|
"in wrong state\n", node->nd_ID);
|
|
LEAVE(ENETUNREACH);
|
|
}
|
|
neg = sp->neg;
|
|
/* If requested specific AC-name, check it. */
|
|
if (neg->ac_name_len) {
|
|
tag = get_tag(ph, PTT_AC_NAME);
|
|
if (!tag) {
|
|
/* No PTT_AC_NAME in PADO */
|
|
break;
|
|
}
|
|
if (neg->ac_name_len != htons(tag->tag_len) ||
|
|
strncmp(neg->ac_name.data,
|
|
(const char *)(tag + 1),
|
|
neg->ac_name_len) != 0) {
|
|
break;
|
|
}
|
|
}
|
|
sp->state = PPPOE_SREQ;
|
|
ng_uncallout(&neg->handle, node);
|
|
|
|
/*
|
|
* 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);
|
|
}
|
|
if ((tag = get_tag(ph, PTT_MAX_PAYL)) &&
|
|
(privp->max_payload.data != 0))
|
|
insert_tag(sp, tag); /* return it */
|
|
insert_tag(sp, &neg->service.hdr); /* Service */
|
|
scan_tags(sp, ph);
|
|
make_packet(sp);
|
|
sp->state = PPPOE_SREQ;
|
|
ng_callout(&neg->handle, node, sp->hook,
|
|
PPPOE_INITIAL_TIMEOUT * hz,
|
|
pppoe_ticker, NULL, 0);
|
|
neg->timeout = PPPOE_INITIAL_TIMEOUT * 2;
|
|
m0 = m_copypacket(neg->m, M_NOWAIT);
|
|
NG_FWD_NEW_DATA(error, item, privp->ethernet_hook, m0);
|
|
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_findcookie(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;
|
|
} else if (sp->state != PPPOE_SOFFER)
|
|
LEAVE (ENETUNREACH);
|
|
neg = sp->neg;
|
|
ng_uncallout(&neg->handle, node);
|
|
neg->pkt->pkt_header.ph.code = PADS_CODE;
|
|
if (sp->Session_ID == 0) {
|
|
neg->pkt->pkt_header.ph.sid =
|
|
htons(pppoe_getnewsession(sp));
|
|
}
|
|
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;
|
|
|
|
/* Send the PADS without a timeout - we're now connected. */
|
|
m0 = m_copypacket(sp->neg->m, M_NOWAIT);
|
|
NG_FWD_NEW_DATA(error, item, privp->ethernet_hook, m0);
|
|
|
|
/*
|
|
* 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;
|
|
/* Configure ethertype depending on what
|
|
* ethertype was used at discovery phase */
|
|
if (sp->pkt_hdr.eh.ether_type ==
|
|
ETHERTYPE_PPPOE_3COM_DISC)
|
|
sp->pkt_hdr.eh.ether_type
|
|
= ETHERTYPE_PPPOE_3COM_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) {
|
|
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_SREQ.
|
|
*/
|
|
sp = NG_HOOK_PRIVATE(sendhook);
|
|
if (sp->state != PPPOE_SREQ)
|
|
LEAVE(ENETUNREACH);
|
|
neg = sp->neg;
|
|
ng_uncallout(&neg->handle, node);
|
|
neg->pkt->pkt_header.ph.sid = wh->ph.sid;
|
|
sp->Session_ID = ntohs(wh->ph.sid);
|
|
pppoe_addsession(sp);
|
|
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 (privp->flags & COMPAT_3COM)
|
|
sp->pkt_hdr.eh.ether_type
|
|
= ETHERTYPE_PPPOE_3COM_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;
|
|
if ((tag = get_tag(ph, PTT_MAX_PAYL)) &&
|
|
(privp->max_payload.data != 0))
|
|
send_maxp(sp, tag);
|
|
pppoe_send_event(sp, NGM_PPPOE_SUCCESS);
|
|
break;
|
|
case PADT_CODE:
|
|
/*
|
|
* Find matching peer/session combination.
|
|
*/
|
|
sp = pppoe_findsession(privp, wh);
|
|
if (sp == NULL)
|
|
LEAVE(ENETUNREACH);
|
|
/* Disconnect that hook. */
|
|
ng_rmhook_self(sp->hook);
|
|
break;
|
|
case PADM_CODE:
|
|
/*
|
|
* We are a client:
|
|
* find matching peer/session combination.
|
|
*/
|
|
sp = pppoe_findsession(privp, wh);
|
|
if (sp == NULL)
|
|
LEAVE (ENETUNREACH);
|
|
if ((tag = get_tag(ph, PTT_HURL)))
|
|
send_hurl(sp, tag);
|
|
if ((tag = get_tag(ph, PTT_MOTM)))
|
|
send_motm(sp, tag);
|
|
break;
|
|
default:
|
|
LEAVE(EPFNOSUPPORT);
|
|
}
|
|
break;
|
|
case ETHERTYPE_PPPOE_3COM_SESS:
|
|
case ETHERTYPE_PPPOE_SESS:
|
|
/*
|
|
* Find matching peer/session combination.
|
|
*/
|
|
sp = pppoe_findsession(privp, wh);
|
|
if (sp == NULL)
|
|
LEAVE (ENETUNREACH);
|
|
m_adj(m, sizeof(*wh));
|
|
|
|
/* If packet too short, dump it. */
|
|
if (m->m_pkthdr.len < length)
|
|
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);
|
|
ng_uncallout(&sp->neg->handle, node);
|
|
free(sp->neg, M_NETGRAPH_PPPOE);
|
|
sp->neg = NULL;
|
|
} else {
|
|
LEAVE (ENETUNREACH);
|
|
}
|
|
}
|
|
NG_FWD_NEW_DATA(error, item, sp->hook, m);
|
|
break;
|
|
default:
|
|
LEAVE(EPFNOSUPPORT);
|
|
}
|
|
quit:
|
|
if (item)
|
|
NG_FREE_ITEM(item);
|
|
NG_FREE_M(m);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Receive data from debug hook and bypass it to ether.
|
|
*/
|
|
static int
|
|
ng_pppoe_rcvdata_debug(hook_p hook, item_p item)
|
|
{
|
|
node_p node = NG_HOOK_NODE(hook);
|
|
const priv_p privp = NG_NODE_PRIVATE(node);
|
|
int error;
|
|
|
|
CTR6(KTR_NET, "%20s: node [%x] (%p) received %p on \"%s\" (%p)",
|
|
__func__, node->nd_ID, node, item, hook->hk_name, hook);
|
|
|
|
NG_FWD_ITEM_HOOK(error, item, privp->ethernet_hook);
|
|
privp->packets_out++;
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Do local shutdown processing..
|
|
* If we are a persistent 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 privp = NG_NODE_PRIVATE(node);
|
|
int i;
|
|
|
|
for (i = 0; i < SESSHASHSIZE; i++)
|
|
mtx_destroy(&privp->sesshash[i].mtx);
|
|
NG_NODE_SET_PRIVATE(node, NULL);
|
|
NG_NODE_UNREF(privp->node);
|
|
free(privp, M_NETGRAPH_PPPOE);
|
|
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;
|
|
|
|
if (hook == privp->debug_hook) {
|
|
privp->debug_hook = NULL;
|
|
} else if (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;
|
|
|
|
/* Generate a packet of that type. */
|
|
m = m_gethdr(M_NOWAIT, MT_DATA);
|
|
if (m == NULL)
|
|
log(LOG_NOTICE, "ng_pppoe[%x]: session out of "
|
|
"mbufs\n", node->nd_ID);
|
|
else {
|
|
struct epoch_tracker et;
|
|
struct pppoe_full_hdr *wh;
|
|
struct pppoe_tag *tag;
|
|
int msglen = strlen(SIGNOFF);
|
|
int error = 0;
|
|
|
|
wh = mtod(m, struct pppoe_full_hdr *);
|
|
bcopy(&sp->pkt_hdr, wh, sizeof(*wh));
|
|
|
|
/* Revert the stored header to DISC/PADT mode. */
|
|
wh->ph.code = PADT_CODE;
|
|
/*
|
|
* Configure ethertype depending on what
|
|
* was used during sessions stage.
|
|
*/
|
|
if (wh->eh.ether_type ==
|
|
ETHERTYPE_PPPOE_3COM_SESS)
|
|
wh->eh.ether_type = ETHERTYPE_PPPOE_3COM_DISC;
|
|
else
|
|
wh->eh.ether_type = ETHERTYPE_PPPOE_DISC;
|
|
/*
|
|
* Add a General error message and adjust
|
|
* sizes.
|
|
*/
|
|
tag = (void *)(&wh->ph + 1);
|
|
tag->tag_type = PTT_GEN_ERR;
|
|
tag->tag_len = htons((u_int16_t)msglen);
|
|
strncpy((char *)(tag + 1), SIGNOFF, msglen);
|
|
m->m_pkthdr.len = m->m_len = sizeof(*wh) + sizeof(*tag) +
|
|
msglen;
|
|
wh->ph.length = htons(sizeof(*tag) + msglen);
|
|
|
|
NET_EPOCH_ENTER(et);
|
|
NG_SEND_DATA_ONLY(error,
|
|
privp->ethernet_hook, m);
|
|
NET_EPOCH_EXIT(et);
|
|
}
|
|
}
|
|
if (sp->state == PPPOE_LISTENING)
|
|
LIST_REMOVE(sp, sessions);
|
|
else if (sp->Session_ID)
|
|
pppoe_delsession(sp);
|
|
/*
|
|
* As long as we have somewhere to store the timeout handle,
|
|
* we may have a timeout pending.. get rid of it.
|
|
*/
|
|
if (sp->neg) {
|
|
ng_uncallout(&sp->neg->handle, node);
|
|
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);
|
|
}
|
|
if ((NG_NODE_NUMHOOKS(node) == 0) &&
|
|
(NG_NODE_IS_VALID(node)))
|
|
ng_rmnode_self(node);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Timeouts come here.
|
|
*/
|
|
static void
|
|
pppoe_ticker(node_p node, hook_p hook, void *arg1, int arg2)
|
|
{
|
|
priv_p privp = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
|
|
sessp sp = NG_HOOK_PRIVATE(hook);
|
|
negp neg = sp->neg;
|
|
struct mbuf *m0 = NULL;
|
|
int error = 0;
|
|
|
|
CTR6(KTR_NET, "%20s: node [%x] (%p) hook \"%s\" (%p) session %d",
|
|
__func__, node->nd_ID, node, hook->hk_name, hook, sp->Session_ID);
|
|
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_NOWAIT);
|
|
NG_SEND_DATA_ONLY( error, privp->ethernet_hook, m0);
|
|
ng_callout(&neg->handle, node, hook, neg->timeout * hz,
|
|
pppoe_ticker, NULL, 0);
|
|
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. */
|
|
log(LOG_NOTICE, "ng_pppoe[%x]: unexpected timeout\n",
|
|
node->nd_ID);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 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 = (const void *)(ph + 1);
|
|
|
|
/*
|
|
* Keep processing tags while a tag header will still fit.
|
|
*/
|
|
CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID);
|
|
|
|
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:
|
|
case PTT_MAX_PAYL:
|
|
case PTT_HURL:
|
|
case PTT_MOTM:
|
|
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;
|
|
|
|
CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID);
|
|
|
|
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);
|
|
}
|