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freebsd-dev/sys/netgraph/ng_pppoe.c
Gleb Smirnoff 5c6d5d5598 Add constant for PPP-Max-PayLoad tag. 
Submitted by:	Dmitry Luhtionov <dmitryluhtionov gmail.com>
2013-07-23 10:25:34 +00:00

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/*
* ng_pppoe.c
*/
/*-
* Copyright (c) 1996-1999 Whistle Communications, Inc.
* All rights reserved.
*
* Subject to the following obligations and disclaimer of warranty, use and
* redistribution of this software, in source or object code forms, with or
* without modifications are expressly permitted by Whistle Communications;
* provided, however, that:
* 1. Any and all reproductions of the source or object code must include the
* copyright notice above and the following disclaimer of warranties; and
* 2. No rights are granted, in any manner or form, to use Whistle
* Communications, Inc. trademarks, including the mark "WHISTLE
* COMMUNICATIONS" on advertising, endorsements, or otherwise except as
* such appears in the above copyright notice or in the software.
*
* THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
* TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
* REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
* INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
* WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
* REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
* SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
* IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
* RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
* WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
* PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGE.
*
* Author: Julian Elischer <julian@freebsd.org>
*
* $FreeBSD$
* $Whistle: ng_pppoe.c,v 1.10 1999/11/01 09:24:52 julian Exp $
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/ktr.h>
#include <sys/mbuf.h>
#include <sys/malloc.h>
#include <sys/errno.h>
#include <sys/syslog.h>
#include <net/ethernet.h>
#include <netgraph/ng_message.h>
#include <netgraph/netgraph.h>
#include <netgraph/ng_parse.h>
#include <netgraph/ng_pppoe.h>
#include <netgraph/ng_ether.h>
#ifdef NG_SEPARATE_MALLOC
static MALLOC_DEFINE(M_NETGRAPH_PPPOE, "netgraph_pppoe", "netgraph pppoe node");
#else
#define M_NETGRAPH_PPPOE M_NETGRAPH
#endif
#define SIGNOFF "session closed"
/*
* This section contains the netgraph method declarations for the
* pppoe node. These methods define the netgraph pppoe 'type'.
*/
static ng_constructor_t ng_pppoe_constructor;
static ng_rcvmsg_t ng_pppoe_rcvmsg;
static ng_shutdown_t ng_pppoe_shutdown;
static ng_newhook_t ng_pppoe_newhook;
static ng_connect_t ng_pppoe_connect;
static ng_rcvdata_t ng_pppoe_rcvdata;
static ng_rcvdata_t ng_pppoe_rcvdata_ether;
static ng_rcvdata_t ng_pppoe_rcvdata_debug;
static ng_disconnect_t ng_pppoe_disconnect;
/* Parse type for struct ngpppoe_init_data */
static const struct ng_parse_struct_field ngpppoe_init_data_type_fields[]
= NG_PPPOE_INIT_DATA_TYPE_INFO;
static const struct ng_parse_type ngpppoe_init_data_state_type = {
&ng_parse_struct_type,
&ngpppoe_init_data_type_fields
};
/* Parse type for struct ngpppoe_sts */
static const struct ng_parse_struct_field ng_pppoe_sts_type_fields[]
= NG_PPPOE_STS_TYPE_INFO;
static const struct ng_parse_type ng_pppoe_sts_state_type = {
&ng_parse_struct_type,
&ng_pppoe_sts_type_fields
};
/* List of commands and how to convert arguments to/from ASCII */
static const struct ng_cmdlist ng_pppoe_cmds[] = {
{
NGM_PPPOE_COOKIE,
NGM_PPPOE_CONNECT,
"pppoe_connect",
&ngpppoe_init_data_state_type,
NULL
},
{
NGM_PPPOE_COOKIE,
NGM_PPPOE_LISTEN,
"pppoe_listen",
&ngpppoe_init_data_state_type,
NULL
},
{
NGM_PPPOE_COOKIE,
NGM_PPPOE_OFFER,
"pppoe_offer",
&ngpppoe_init_data_state_type,
NULL
},
{
NGM_PPPOE_COOKIE,
NGM_PPPOE_SERVICE,
"pppoe_service",
&ngpppoe_init_data_state_type,
NULL
},
{
NGM_PPPOE_COOKIE,
NGM_PPPOE_SUCCESS,
"pppoe_success",
&ng_pppoe_sts_state_type,
NULL
},
{
NGM_PPPOE_COOKIE,
NGM_PPPOE_FAIL,
"pppoe_fail",
&ng_pppoe_sts_state_type,
NULL
},
{
NGM_PPPOE_COOKIE,
NGM_PPPOE_CLOSE,
"pppoe_close",
&ng_pppoe_sts_state_type,
NULL
},
{
NGM_PPPOE_COOKIE,
NGM_PPPOE_SETMODE,
"pppoe_setmode",
&ng_parse_string_type,
NULL
},
{
NGM_PPPOE_COOKIE,
NGM_PPPOE_GETMODE,
"pppoe_getmode",
NULL,
&ng_parse_string_type
},
{
NGM_PPPOE_COOKIE,
NGM_PPPOE_SETENADDR,
"setenaddr",
&ng_parse_enaddr_type,
NULL
},
{ 0 }
};
/* Netgraph node type descriptor */
static struct ng_type typestruct = {
.version = NG_ABI_VERSION,
.name = NG_PPPOE_NODE_TYPE,
.constructor = ng_pppoe_constructor,
.rcvmsg = ng_pppoe_rcvmsg,
.shutdown = ng_pppoe_shutdown,
.newhook = ng_pppoe_newhook,
.connect = ng_pppoe_connect,
.rcvdata = ng_pppoe_rcvdata,
.disconnect = ng_pppoe_disconnect,
.cmdlist = ng_pppoe_cmds,
};
NETGRAPH_INIT(pppoe, &typestruct);
/*
* States for the session state machine.
* These have no meaning if there is no hook attached yet.
*/
enum state {
PPPOE_SNONE=0, /* [both] Initial state */
PPPOE_LISTENING, /* [Daemon] Listening for discover initiation pkt */
PPPOE_SINIT, /* [Client] Sent discovery initiation */
PPPOE_PRIMED, /* [Server] Awaiting PADI from daemon */
PPPOE_SOFFER, /* [Server] Sent offer message (got PADI)*/
PPPOE_SREQ, /* [Client] Sent a Request */
PPPOE_NEWCONNECTED, /* [Server] Connection established, No data received */
PPPOE_CONNECTED, /* [Both] Connection established, Data received */
PPPOE_DEAD /* [Both] */
};
#define NUMTAGS 20 /* number of tags we are set up to work with */
/*
* Information we store for each hook on each node for negotiating the
* session. The mbuf and cluster are freed once negotiation has completed.
* The whole negotiation block is then discarded.
*/
struct sess_neg {
struct mbuf *m; /* holds cluster with last sent packet */
union packet *pkt; /* points within the above cluster */
struct callout handle; /* see timeout(9) */
u_int timeout; /* 0,1,2,4,8,16 etc. seconds */
u_int numtags;
const struct pppoe_tag *tags[NUMTAGS];
u_int service_len;
u_int ac_name_len;
struct datatag service;
struct datatag ac_name;
};
typedef struct sess_neg *negp;
/*
* Session information that is needed after connection.
*/
struct sess_con {
hook_p hook;
uint16_t Session_ID;
enum state state;
ng_ID_t creator; /* who to notify */
struct pppoe_full_hdr pkt_hdr; /* used when connected */
negp neg; /* used when negotiating */
LIST_ENTRY(sess_con) sessions;
};
typedef struct sess_con *sessp;
#define SESSHASHSIZE 0x0100
#define SESSHASH(x) (((x) ^ ((x) >> 8)) & (SESSHASHSIZE - 1))
struct sess_hash_entry {
struct mtx mtx;
LIST_HEAD(hhead, sess_con) head;
};
/*
* Information we store for each node
*/
struct PPPoE {
node_p node; /* back pointer to node */
hook_p ethernet_hook;
hook_p debug_hook;
u_int packets_in; /* packets in from ethernet */
u_int packets_out; /* packets out towards ethernet */
uint32_t flags;
#define COMPAT_3COM 0x00000001
#define COMPAT_DLINK 0x00000002
struct ether_header eh;
LIST_HEAD(, sess_con) listeners;
struct sess_hash_entry sesshash[SESSHASHSIZE];
};
typedef struct PPPoE *priv_p;
union uniq {
char bytes[sizeof(void *)];
void *pointer;
};
#define LEAVE(x) do { error = x; goto quit; } while(0)
static void pppoe_start(sessp sp);
static void pppoe_ticker(node_p node, hook_p hook, void *arg1, int arg2);
static const struct pppoe_tag *scan_tags(sessp sp,
const struct pppoe_hdr* ph);
static int pppoe_send_event(sessp sp, enum cmd cmdid);
/*************************************************************************
* Some basic utilities from the Linux version with author's permission.*
* Author: Michal Ostrowski <mostrows@styx.uwaterloo.ca> *
************************************************************************/
/*
* Return the location where the next tag can be put
*/
static __inline const struct pppoe_tag*
next_tag(const struct pppoe_hdr* ph)
{
return (const struct pppoe_tag*)(((const char*)(ph + 1))
+ ntohs(ph->length));
}
/*
* Look for a tag of a specific type.
* Don't trust any length the other end says,
* but assume we already sanity checked ph->length.
*/
static const struct pppoe_tag*
get_tag(const struct pppoe_hdr* ph, uint16_t idx)
{
const char *const end = (const char *)next_tag(ph);
const struct pppoe_tag *pt = (const void *)(ph + 1);
const char *ptn;
/*
* Keep processing tags while a tag header will still fit.
*/
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) {
CTR2(KTR_NET, "%20s: invalid length for tag %d",
__func__, idx);
return (NULL);
}
if (pt->tag_type == idx) {
CTR2(KTR_NET, "%20s: found tag %d", __func__, idx);
return (pt);
}
pt = (const struct pppoe_tag*)ptn;
}
CTR2(KTR_NET, "%20s: not found tag %d", __func__, idx);
return (NULL);
}
/**************************************************************************
* Inlines to initialise or add tags to a session's tag list.
**************************************************************************/
/*
* Initialise the session's tag list.
*/
static void
init_tags(sessp sp)
{
KASSERT(sp->neg != NULL, ("%s: no neg", __func__));
sp->neg->numtags = 0;
}
static void
insert_tag(sessp sp, const struct pppoe_tag *tp)
{
negp neg = sp->neg;
int i;
KASSERT(neg != NULL, ("%s: no neg", __func__));
if ((i = neg->numtags++) < NUMTAGS) {
neg->tags[i] = tp;
} else {
log(LOG_NOTICE, "ng_pppoe: asked to add too many tags to "
"packet\n");
neg->numtags--;
}
}
/*
* 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.
* Also assume that neg->wh points to the correct
* location at the front of the buffer space.
*/
static void
make_packet(sessp sp) {
struct pppoe_full_hdr *wh = &sp->neg->pkt->pkt_header;
const struct pppoe_tag **tag;
char *dp;
int count;
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);
dp = (char *)(&wh->ph + 1);
for (count = 0, tag = sp->neg->tags;
((count < sp->neg->numtags) && (count < NUMTAGS));
tag++, count++) {
tlen = ntohs((*tag)->tag_len) + sizeof(**tag);
if ((length + tlen) > (ETHER_MAX_LEN - 4 - sizeof(*wh))) {
log(LOG_NOTICE, "ng_pppoe: tags too long\n");
sp->neg->numtags = count;
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;
union uniq uniq;
bcopy(tag + 1, uniq.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 (uniq.pointer == NG_HOOK_PRIVATE(hook))
break;
}
CTR3(KTR_NET, "%20s: matched %p for %p", __func__, hook, uniq.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)
{
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:
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.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 advertisments are set up
* on sessions that are in PRIMED state.
*/
if (msg->header.cmd == NGM_PPPOE_SERVICE)
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 of fail message to them later.
* Move the session to SINIT.
* Set up the session to the correct state and
* start it.
*/
int i, acnlen = 0, acnsep = 0, srvlen;
for (i = 0; i < ourmsg->data_len; i++) {
if (ourmsg->data[i] == '\\') {
acnlen = i;
acnsep = 1;
break;
}
}
srvlen = ourmsg->data_len - acnlen - acnsep;
bcopy(ourmsg->data, neg->ac_name.data, acnlen);
neg->ac_name_len = acnlen;
neg->service.hdr.tag_type = PTT_SRV_NAME;
neg->service.hdr.tag_len = htons((uint16_t)srvlen);
bcopy(ourmsg->data + acnlen + acnsep,
neg->service.data, srvlen);
neg->service_len = srvlen;
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((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;
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 {
struct pppoe_tag hdr;
union uniq data;
} __packed uniqtag;
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;
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, &neg->service.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);
}
/*
* 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);
}
/*
* 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;
uint16_t session;
uint16_t length;
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;
session = ntohs(wh->ph.sid);
length = ntohs(wh->ph.length);
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_full_hdr *wh;
const struct pppoe_hdr *ph;
negp neg = NULL;
struct mbuf *m;
hook_p sendhook;
int error = 0;
uint16_t session;
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;
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) {
CTR1(KTR_NET, "%20s: PADI w/o Service-Name",
__func__);
LEAVE(ENETUNREACH);
}
/*
* 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) ||
(ntohs(utag->tag_len) != sizeof(sp))) {
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);
}
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_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;
} 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) ||
(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_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;
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;
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 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 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. */
MGETHDR(m, 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 msglen = strlen(SIGNOFF);
int error = 0;
m->m_pkthdr.rcvif = NULL;
m->m_pkthdr.len = m->m_len = sizeof(*wh);
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(*tag) +
msglen);
wh->ph.length = htons(sizeof(*tag) + msglen);
NG_SEND_DATA_ONLY(error,
privp->ethernet_hook, m);
}
}
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:
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);
}
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