FreeBSD-5.3/sys/netgraph/ng_sppp.c
/*
* ng_sppp.c Netgraph to Sppp module.
*
* Copyright (C) 2002-2004 Cronyx Engineering.
* Copyright (C) 2002-2004 Roman Kurakin <rik@cronyx.ru>
*
* This software is distributed with NO WARRANTIES, not even the implied
* warranties for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*
* Authors grant any other persons or organisations a permission to use,
* modify and redistribute this software in source and binary forms,
* as long as this message is kept with the software, all derivative
* works or modified versions.
*
* Cronyx Id: ng_sppp.c,v 1.1.2.10 2004/03/01 15:17:21 rik Exp $
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/sys/netgraph/ng_sppp.c,v 1.4 2004/07/04 16:11:02 stefanf Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/errno.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/errno.h>
#include <sys/sockio.h>
#include <sys/socket.h>
#include <sys/syslog.h>
#include <sys/libkern.h>
#include <net/if.h>
#include <net/if_types.h>
#include <net/bpf.h>
#include <net/if_sppp.h>
#include <netinet/in.h>
#include <netgraph/ng_message.h>
#include <netgraph/netgraph.h>
#include <netgraph/ng_parse.h>
#include <netgraph/ng_sppp.h>
#ifdef NG_SEPARATE_MALLOC
MALLOC_DEFINE(M_NETGRAPH_SPPP, "netgraph_sppp", "netgraph sppp node ");
#else
#define M_NETGRAPH_SPPP M_NETGRAPH
#endif
/* Node private data */
struct ng_sppp_private {
struct sppp *pp; /* Our interface */
int unit; /* Interface unit number */
node_p node; /* Our netgraph node */
hook_p hook; /* Hook */
};
typedef struct ng_sppp_private *priv_p;
/* Interface methods */
static void ng_sppp_start (struct ifnet *ifp);
static int ng_sppp_ioctl (struct ifnet *ifp, u_long cmd, caddr_t data);
/* Netgraph methods */
static ng_constructor_t ng_sppp_constructor;
static ng_rcvmsg_t ng_sppp_rcvmsg;
static ng_shutdown_t ng_sppp_shutdown;
static ng_newhook_t ng_sppp_newhook;
static ng_rcvdata_t ng_sppp_rcvdata;
static ng_disconnect_t ng_sppp_disconnect;
/* Parse type for struct ng_sppp_ifname */
static const struct ng_parse_fixedstring_info ng_sppp_ifname_info = {
NG_SPPP_IFACE_NAME_MAX + 1
};
static const struct ng_parse_type ng_sppp_ifname_type = {
&ng_parse_fixedstring_type,
&ng_sppp_ifname_info
};
/* List of commands and how to convert arguments to/from ASCII */
static const struct ng_cmdlist ng_sppp_cmds[] = {
{
NGM_SPPP_COOKIE,
NGM_SPPP_GET_IFNAME,
"getifname",
NULL,
&ng_sppp_ifname_type
},
{ 0 }
};
/* Node type descriptor */
static struct ng_type typestruct = {
.version = NG_ABI_VERSION,
.name = NG_SPPP_NODE_TYPE,
.constructor = ng_sppp_constructor,
.rcvmsg = ng_sppp_rcvmsg,
.shutdown = ng_sppp_shutdown,
.newhook = ng_sppp_newhook,
.rcvdata = ng_sppp_rcvdata,
.disconnect = ng_sppp_disconnect,
.cmdlist = ng_sppp_cmds,
};
NETGRAPH_INIT(sppp, &typestruct);
MODULE_DEPEND (ng_sppp, sppp, 1, 1, 1);
/* We keep a bitmap indicating which unit numbers are free.
Zero means the unit number is free, one means it's taken. */
static unsigned char *ng_sppp_units = NULL;
static unsigned char ng_sppp_units_len = 0;
static unsigned char ng_units_in_use = 0;
/*
* Find the first free unit number for a new interface.
* Increase the size of the unit bitmap as necessary.
*/
static __inline int
ng_sppp_get_unit (int *unit)
{
int index, bit;
unsigned char mask;
for (index = 0; index < ng_sppp_units_len
&& ng_sppp_units[index] == 0xFF; index++);
if (index == ng_sppp_units_len) { /* extend array */
unsigned char *newarray;
int newlen;
newlen = (2 * ng_sppp_units_len) + sizeof (*ng_sppp_units);
MALLOC (newarray, unsigned char *,
newlen * sizeof (*ng_sppp_units), M_NETGRAPH_SPPP, M_NOWAIT);
if (newarray == NULL)
return (ENOMEM);
bcopy (ng_sppp_units, newarray,
ng_sppp_units_len * sizeof (*ng_sppp_units));
bzero (newarray + ng_sppp_units_len,
newlen - ng_sppp_units_len);
if (ng_sppp_units != NULL)
FREE (ng_sppp_units, M_NETGRAPH_SPPP);
ng_sppp_units = newarray;
ng_sppp_units_len = newlen;
}
mask = ng_sppp_units[index];
for (bit = 0; (mask & 1) != 0; bit++)
mask >>= 1;
KASSERT ((bit >= 0 && bit < NBBY),
("%s: word=%d bit=%d", __func__, ng_sppp_units[index], bit));
ng_sppp_units[index] |= (1 << bit);
*unit = (index * NBBY) + bit;
ng_units_in_use++;
return (0);
}
/*
* Free a no longer needed unit number.
*/
static __inline void
ng_sppp_free_unit (int unit)
{
int index, bit;
index = unit / NBBY;
bit = unit % NBBY;
KASSERT (index < ng_sppp_units_len,
("%s: unit=%d len=%d", __func__, unit, ng_sppp_units_len));
KASSERT ((ng_sppp_units[index] & (1 << bit)) != 0,
("%s: unit=%d is free", __func__, unit));
ng_sppp_units[index] &= ~(1 << bit);
ng_units_in_use--;
if (ng_units_in_use == 0) {
FREE (ng_sppp_units, M_NETGRAPH_SPPP);
ng_sppp_units_len = 0;
ng_sppp_units = NULL;
}
}
/************************************************************************
INTERFACE STUFF
************************************************************************/
/*
* Process an ioctl for the interface
*/
static int
ng_sppp_ioctl (struct ifnet *ifp, u_long command, caddr_t data)
{
int error = 0;
error = sppp_ioctl (ifp, command, data);
if (error)
return error;
return error;
}
/*
* This routine should never be called
*/
static void
ng_sppp_start (struct ifnet *ifp)
{
struct mbuf *m;
int len, error = 0;
priv_p priv = ifp->if_softc;
/* Check interface flags */
/*
* This has side effects. It is not good idea to stop sending if we
* are not UP. If we are not running we still want to send LCP term
* packets.
*/
/* if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) {*/
/* return;*/
/* }*/
if (ifp->if_flags & IFF_OACTIVE)
return;
if (!priv->hook)
return;
ifp->if_flags |= IFF_OACTIVE;
while ((m = sppp_dequeue (ifp)) != NULL) {
if (ifp->if_bpf)
BPF_MTAP (ifp, m);
len = m->m_pkthdr.len;
NG_SEND_DATA_ONLY (error, priv->hook, m);
if (error) {
ifp->if_flags &= ~IFF_OACTIVE;
return;
}
}
ifp->if_flags &= ~IFF_OACTIVE;
}
/************************************************************************
NETGRAPH NODE STUFF
************************************************************************/
/*
* Constructor for a node
*/
static int
ng_sppp_constructor (node_p node)
{
char ifname[NG_SPPP_IFACE_NAME_MAX + 1];
struct sppp *pp;
priv_p priv;
int error = 0;
/* Allocate node and interface private structures */
MALLOC (priv, priv_p, sizeof(*priv), M_NETGRAPH_SPPP, M_NOWAIT|M_ZERO);
if (priv == NULL)
return (ENOMEM);
MALLOC (pp, struct sppp *, sizeof(*pp), M_NETGRAPH_SPPP, M_NOWAIT|M_ZERO);
if (pp == NULL) {
FREE (priv, M_NETGRAPH_SPPP);
return (ENOMEM);
}
/* Link them together */
pp->pp_if.if_softc = priv;
priv->pp = pp;
/* Get an interface unit number */
if ((error = ng_sppp_get_unit(&priv->unit)) != 0) {
FREE (pp, M_NETGRAPH_SPPP);
FREE (priv, M_NETGRAPH_SPPP);
return (error);
}
/* Link together node and private info */
NG_NODE_SET_PRIVATE (node, priv);
priv->node = node;
/* Initialize interface structure */
if_initname (&pp->pp_if, NG_SPPP_IFACE_NAME, priv->unit);
pp->pp_if.if_start = ng_sppp_start;
pp->pp_if.if_ioctl = ng_sppp_ioctl;
pp->pp_if.if_watchdog = NULL;
pp->pp_if.if_flags = (IFF_POINTOPOINT|IFF_MULTICAST);
/* Give this node the same name as the interface (if possible) */
bzero (ifname, sizeof(ifname));
snprintf (ifname, sizeof(ifname), "%s%d", NG_SPPP_IFACE_NAME, priv->unit);
if (ng_name_node(node, ifname) != 0)
log (LOG_WARNING, "%s: can't acquire netgraph name\n", ifname);
/* Attach the interface */
sppp_attach (&pp->pp_if);
if_attach (&pp->pp_if);
bpfattach (&pp->pp_if, DLT_NULL, sizeof(u_int));
/* Done */
return (0);
}
/*
* Give our ok for a hook to be added
*/
static int
ng_sppp_newhook (node_p node, hook_p hook, const char *name)
{
priv_p priv = NG_NODE_PRIVATE (node);
if (strcmp (name, NG_SPPP_HOOK_DOWNSTREAM) != 0)
return (EINVAL);
if (priv->hook)
return (EISCONN);
priv->hook = hook;
NG_HOOK_SET_PRIVATE (hook, priv);
return (0);
}
/*
* Receive a control message
*/
static int
ng_sppp_rcvmsg (node_p node, item_p item, hook_p lasthook)
{
const priv_p priv = NG_NODE_PRIVATE (node);
struct ng_mesg *msg = NULL;
struct ng_mesg *resp = NULL;
struct sppp *const pp = priv->pp;
int error = 0;
NGI_GET_MSG (item, msg);
switch (msg->header.typecookie) {
case NGM_SPPP_COOKIE:
switch (msg->header.cmd) {
case NGM_SPPP_GET_IFNAME:
{
struct ng_sppp_ifname *arg;
NG_MKRESPONSE (resp, msg, sizeof (*arg), M_NOWAIT);
if (!resp) {
error = ENOMEM;
break;
}
arg = (struct ng_sppp_ifname *)resp->data;
snprintf (arg->ngif_name, sizeof (arg->ngif_name),
"%s", pp->pp_if.if_xname);
break;
}
default:
error = EINVAL;
break;
}
break;
default:
error = EINVAL;
break;
}
NG_RESPOND_MSG (error, node, item, resp);
NG_FREE_MSG (msg);
return (error);
}
/*
* Recive data from a hook. Pass the packet to the correct input routine.
*/
static int
ng_sppp_rcvdata (hook_p hook, item_p item)
{
struct mbuf *m;
const priv_p priv = NG_NODE_PRIVATE (NG_HOOK_NODE (hook));
struct sppp *const pp = priv->pp;
NGI_GET_M (item, m);
NG_FREE_ITEM (item);
/* Sanity checks */
KASSERT (m->m_flags & M_PKTHDR, ("%s: not pkthdr", __func__));
if ((pp->pp_if.if_flags & IFF_UP) == 0) {
NG_FREE_M (m);
return (ENETDOWN);
}
/* Update interface stats */
pp->pp_if.if_ipackets++;
/* Note receiving interface */
m->m_pkthdr.rcvif = &pp->pp_if;
/* Berkeley packet filter */
if (pp->pp_if.if_bpf)
BPF_MTAP (&pp->pp_if, m);
/* Send packet */
sppp_input (&pp->pp_if, m);
return 0;
}
/*
* Shutdown and remove the node and its associated interface.
*/
static int
ng_sppp_shutdown (node_p node)
{
const priv_p priv = NG_NODE_PRIVATE(node);
/* Detach from the packet filter list of interfaces. */
bpfdetach (&priv->pp->pp_if);
sppp_detach (&priv->pp->pp_if);
if_detach (&priv->pp->pp_if);
FREE (priv->pp, M_NETGRAPH_SPPP);
priv->pp = NULL;
ng_sppp_free_unit (priv->unit);
FREE (priv, M_NETGRAPH_SPPP);
NG_NODE_SET_PRIVATE (node, NULL);
NG_NODE_UNREF (node);
return (0);
}
/*
* Hook disconnection.
*/
static int
ng_sppp_disconnect (hook_p hook)
{
const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
if (priv)
priv->hook = NULL;
return (0);
}