mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-23 11:18:54 +00:00
958 lines
23 KiB
C
958 lines
23 KiB
C
|
|
||
|
/*
|
||
|
* ng_socket.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@whistle.com>
|
||
|
*
|
||
|
* $FreeBSD$
|
||
|
* $Whistle: ng_socket.c,v 1.25 1999/01/28 23:54:54 julian Exp $
|
||
|
*/
|
||
|
|
||
|
/*
|
||
|
* Netgraph socket nodes
|
||
|
*
|
||
|
* There are two types of netgraph sockets, control and data.
|
||
|
* Control sockets have a netgraph node, but data sockets are
|
||
|
* parasitic on control sockets, and have no node of their own.
|
||
|
*/
|
||
|
|
||
|
#include <sys/param.h>
|
||
|
#include <sys/systm.h>
|
||
|
#include <sys/proc.h>
|
||
|
#include <sys/domain.h>
|
||
|
#include <sys/errno.h>
|
||
|
#include <sys/kernel.h>
|
||
|
#include <sys/file.h>
|
||
|
#include <sys/filedesc.h>
|
||
|
#include <sys/malloc.h>
|
||
|
#include <sys/queue.h>
|
||
|
#include <sys/mbuf.h>
|
||
|
#include <sys/protosw.h>
|
||
|
#include <sys/socket.h>
|
||
|
#include <sys/socketvar.h>
|
||
|
#include <sys/sysctl.h>
|
||
|
#ifdef NOTYET
|
||
|
#include <sys/vnode.h>
|
||
|
#endif
|
||
|
#include <netgraph/ng_message.h>
|
||
|
#include <netgraph/netgraph.h>
|
||
|
#include <netgraph/ng_socket.h>
|
||
|
#include <netgraph/ng_socketvar.h>
|
||
|
|
||
|
/*
|
||
|
* It's Ascii-art time!
|
||
|
* +-------------+ +-------------+
|
||
|
* |socket (ctl)| |socket (data)|
|
||
|
* +-------------+ +-------------+
|
||
|
* ^ ^
|
||
|
* | |
|
||
|
* v v
|
||
|
* +-----------+ +-----------+
|
||
|
* |pcb (ctl)| |pcb (data)|
|
||
|
* +-----------+ +-----------+
|
||
|
* ^ ^
|
||
|
* | |
|
||
|
* v v
|
||
|
* +--------------------------+
|
||
|
* | Socket type private |
|
||
|
* | data |
|
||
|
* +--------------------------+
|
||
|
* ^
|
||
|
* |
|
||
|
* v
|
||
|
* +----------------+
|
||
|
* | struct ng_node |
|
||
|
* +----------------+
|
||
|
*/
|
||
|
|
||
|
/* Netgraph node methods */
|
||
|
static int ngs_constructor(node_p *nodep);
|
||
|
static int ngs_rcvmsg(node_p node, struct ng_mesg *msg,
|
||
|
const char *retaddr, struct ng_mesg **resp);
|
||
|
static int ngs_rmnode(node_p node);
|
||
|
static int ngs_newhook(node_p node, hook_p hook, const char *name);
|
||
|
static int ngs_rcvdata(hook_p hook, struct mbuf *m, meta_p meta);
|
||
|
|
||
|
/* Internal methods */
|
||
|
static int ng_attach_data(struct socket *so);
|
||
|
static int ng_attach_cntl(struct socket *so);
|
||
|
static int ng_attach_common(struct socket *so, int type);
|
||
|
static void ng_detach_common(struct ngpcb *pcbp, int type);
|
||
|
/*static int ng_internalize(struct mbuf *m, struct proc *p); */
|
||
|
|
||
|
static int ng_connect_data(struct sockaddr *nam, struct ngpcb *pcbp);
|
||
|
static int ng_connect_cntl(struct sockaddr *nam, struct ngpcb *pcbp);
|
||
|
static int ng_bind(struct sockaddr *nam, struct ngpcb *pcbp);
|
||
|
|
||
|
static int ngs_mod_event(module_t mod, int event, void *data);
|
||
|
static int ship_msg(struct ngpcb *pcbp, struct ng_mesg *msg,
|
||
|
struct sockaddr_ng *addr);
|
||
|
|
||
|
/* Netgraph type descriptor */
|
||
|
static struct ng_type typestruct = {
|
||
|
NG_VERSION,
|
||
|
NG_SOCKET_NODE_TYPE,
|
||
|
ngs_mod_event,
|
||
|
ngs_constructor,
|
||
|
ngs_rcvmsg,
|
||
|
ngs_rmnode,
|
||
|
ngs_newhook,
|
||
|
NULL,
|
||
|
NULL,
|
||
|
ngs_rcvdata,
|
||
|
ngs_rcvdata,
|
||
|
NULL,
|
||
|
};
|
||
|
NETGRAPH_INIT(socket, &typestruct);
|
||
|
|
||
|
/* Buffer space */
|
||
|
static u_long ngpdg_sendspace = 2 * 1024; /* really max datagram size */
|
||
|
static u_long ngpdg_recvspace = 20 * 1024;
|
||
|
|
||
|
/* List of all sockets */
|
||
|
LIST_HEAD(, ngpcb) ngsocklist;
|
||
|
|
||
|
#define sotongpcb(so) ((struct ngpcb *)so->so_pcb)
|
||
|
|
||
|
/* If getting unexplained errors returned, set this to "Debugger("X"); */
|
||
|
#ifndef TRAP_ERROR
|
||
|
#define TRAP_ERROR
|
||
|
#endif
|
||
|
|
||
|
/***************************************************************
|
||
|
Control sockets
|
||
|
***************************************************************/
|
||
|
|
||
|
static int
|
||
|
ngc_attach(struct socket *so, int proto, struct proc *p)
|
||
|
{
|
||
|
struct ngpcb *const pcbp = sotongpcb(so);
|
||
|
|
||
|
if (pcbp != NULL)
|
||
|
return (EISCONN);
|
||
|
return (ng_attach_cntl(so));
|
||
|
}
|
||
|
|
||
|
static int
|
||
|
ngc_detach(struct socket *so)
|
||
|
{
|
||
|
struct ngpcb *const pcbp = sotongpcb(so);
|
||
|
|
||
|
if (pcbp == NULL)
|
||
|
return (EINVAL);
|
||
|
ng_detach_common(pcbp, NG_CONTROL);
|
||
|
return (0);
|
||
|
}
|
||
|
|
||
|
static int
|
||
|
ngc_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
|
||
|
struct mbuf *control, struct proc *p)
|
||
|
{
|
||
|
struct ngpcb *const pcbp = sotongpcb(so);
|
||
|
struct sockaddr_ng *const sap = (struct sockaddr_ng *) addr;
|
||
|
struct ng_mesg *resp;
|
||
|
struct mbuf *m0;
|
||
|
char *msg, *path = NULL;
|
||
|
int len, error = 0;
|
||
|
|
||
|
if (pcbp == NULL) {
|
||
|
error = EINVAL;
|
||
|
goto release;
|
||
|
}
|
||
|
#ifdef NOTYET
|
||
|
if (control && (error = ng_internalize(control, p))) {
|
||
|
if (pcbp->sockdata == NULL) {
|
||
|
error = ENOTCONN;
|
||
|
goto release;
|
||
|
}
|
||
|
}
|
||
|
#else /* NOTYET */
|
||
|
if (control) {
|
||
|
error = EINVAL;
|
||
|
goto release;
|
||
|
}
|
||
|
#endif /* NOTYET */
|
||
|
|
||
|
/* Require destination as there may be >= 1 hooks on this node */
|
||
|
if (addr == NULL) {
|
||
|
error = EDESTADDRREQ;
|
||
|
goto release;
|
||
|
}
|
||
|
|
||
|
/* Allocate an expendable buffer for the path, chop off
|
||
|
* the sockaddr header, and make sure it's NUL terminated */
|
||
|
len = sap->sg_len - 2;
|
||
|
MALLOC(path, char *, len + 1, M_NETGRAPH, M_WAITOK);
|
||
|
if (path == NULL) {
|
||
|
error = ENOMEM;
|
||
|
goto release;
|
||
|
}
|
||
|
bcopy(sap->sg_data, path, len);
|
||
|
path[len] = '\0';
|
||
|
|
||
|
/* Move the actual message out of mbufs into a linear buffer.
|
||
|
* Start by adding up the size of the data. (could use mh_len?) */
|
||
|
for (len = 0, m0 = m; m0 != NULL; m0 = m0->m_next)
|
||
|
len += m0->m_len;
|
||
|
|
||
|
/* Move the data into a linear buffer as well. Messages are not
|
||
|
* delivered in mbufs. */
|
||
|
MALLOC(msg, char *, len + 1, M_NETGRAPH, M_WAITOK);
|
||
|
if (msg == NULL) {
|
||
|
error = ENOMEM;
|
||
|
goto release;
|
||
|
}
|
||
|
m_copydata(m, 0, len, msg);
|
||
|
|
||
|
/* The callee will free the msg when done. The addr is our business. */
|
||
|
error = ng_send_msg(pcbp->sockdata->node,
|
||
|
(struct ng_mesg *) msg, path, &resp);
|
||
|
|
||
|
/* If the callee responded with a synchronous response, then put it
|
||
|
* back on the receive side of the socket; sap is source address. */
|
||
|
if (error == 0 && resp != NULL)
|
||
|
error = ship_msg(pcbp, resp, sap);
|
||
|
|
||
|
release:
|
||
|
if (path != NULL)
|
||
|
FREE(path, M_NETGRAPH);
|
||
|
if (control != NULL)
|
||
|
m_freem(control);
|
||
|
if (m != NULL)
|
||
|
m_freem(m);
|
||
|
return (error);
|
||
|
}
|
||
|
|
||
|
static int
|
||
|
ngc_bind(struct socket *so, struct sockaddr *nam, struct proc *p)
|
||
|
{
|
||
|
struct ngpcb *const pcbp = sotongpcb(so);
|
||
|
|
||
|
if (pcbp == 0)
|
||
|
return (EINVAL);
|
||
|
return (ng_bind(nam, pcbp));
|
||
|
}
|
||
|
|
||
|
static int
|
||
|
ngc_connect(struct socket *so, struct sockaddr *nam, struct proc *p)
|
||
|
{
|
||
|
struct ngpcb *const pcbp = sotongpcb(so);
|
||
|
|
||
|
if (pcbp == 0)
|
||
|
return (EINVAL);
|
||
|
return (ng_connect_cntl(nam, pcbp));
|
||
|
}
|
||
|
|
||
|
/***************************************************************
|
||
|
Data sockets
|
||
|
***************************************************************/
|
||
|
|
||
|
static int
|
||
|
ngd_attach(struct socket *so, int proto, struct proc *p)
|
||
|
{
|
||
|
struct ngpcb *const pcbp = sotongpcb(so);
|
||
|
|
||
|
if (pcbp != NULL)
|
||
|
return (EISCONN);
|
||
|
return (ng_attach_data(so));
|
||
|
}
|
||
|
|
||
|
static int
|
||
|
ngd_detach(struct socket *so)
|
||
|
{
|
||
|
struct ngpcb *const pcbp = sotongpcb(so);
|
||
|
|
||
|
if (pcbp == NULL)
|
||
|
return (EINVAL);
|
||
|
ng_detach_common(pcbp, NG_DATA);
|
||
|
return (0);
|
||
|
}
|
||
|
|
||
|
static int
|
||
|
ngd_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
|
||
|
struct mbuf *control, struct proc *p)
|
||
|
{
|
||
|
struct ngpcb *const pcbp = sotongpcb(so);
|
||
|
struct sockaddr_ng *const sap = (struct sockaddr_ng *) addr;
|
||
|
char *hookname = NULL;
|
||
|
meta_p mp = NULL;
|
||
|
int len, error;
|
||
|
hook_p hook;
|
||
|
|
||
|
if ((pcbp == NULL) || (control != NULL)) {
|
||
|
error = EINVAL;
|
||
|
goto release;
|
||
|
}
|
||
|
if (pcbp->sockdata == NULL) {
|
||
|
error = ENOTCONN;
|
||
|
goto release;
|
||
|
}
|
||
|
if (addr == NULL) {
|
||
|
error = EDESTADDRREQ;
|
||
|
goto release;
|
||
|
}
|
||
|
|
||
|
/* Allocate an expendable buffer for the hook name, chop off
|
||
|
* the sockaddr header, and make sure it's NUL terminated */
|
||
|
len = sap->sg_len - 2;
|
||
|
MALLOC(hookname, char *, len + 1, M_NETGRAPH, M_WAITOK);
|
||
|
if (hookname == NULL) {
|
||
|
error = ENOMEM;
|
||
|
goto release;
|
||
|
}
|
||
|
bcopy(sap->sg_data, hookname, len);
|
||
|
hookname[len] = '\0';
|
||
|
|
||
|
/* Find the correct hook from 'hookname' */
|
||
|
LIST_FOREACH(hook, &pcbp->sockdata->node->hooks, hooks) {
|
||
|
if (strcmp(hookname, hook->name) == 0)
|
||
|
break;
|
||
|
}
|
||
|
|
||
|
/* Send data (OK if hook is NULL) */
|
||
|
NG_SEND_DATA(error, hook, m, mp); /* makes m NULL */
|
||
|
|
||
|
release:
|
||
|
if (hookname != NULL)
|
||
|
FREE(hookname, M_NETGRAPH);
|
||
|
if (control != NULL)
|
||
|
m_freem(control);
|
||
|
if (m != NULL)
|
||
|
m_freem(m);
|
||
|
return (error);
|
||
|
}
|
||
|
|
||
|
static int
|
||
|
ngd_connect(struct socket *so, struct sockaddr *nam, struct proc *p)
|
||
|
{
|
||
|
struct ngpcb *const pcbp = sotongpcb(so);
|
||
|
|
||
|
if (pcbp == 0)
|
||
|
return (EINVAL);
|
||
|
return (ng_connect_data(nam, pcbp));
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Used for both data and control sockets
|
||
|
*/
|
||
|
static int
|
||
|
ng_setsockaddr(struct socket *so, struct sockaddr **addr)
|
||
|
{
|
||
|
struct ngpcb *const pcbp = sotongpcb(so);
|
||
|
struct sockaddr *sa;
|
||
|
int namelen;
|
||
|
|
||
|
if (pcbp == 0)
|
||
|
return (EINVAL);
|
||
|
if (pcbp->sockdata->node->name != NULL) {
|
||
|
namelen = strlen(pcbp->sockdata->node->name) + 3;
|
||
|
MALLOC(sa, struct sockaddr *, namelen, M_SONAME, M_WAITOK);
|
||
|
if (sa == NULL)
|
||
|
return (ENOMEM);
|
||
|
sa->sa_family = AF_NETGRAPH;
|
||
|
sa->sa_len = namelen;
|
||
|
strcpy(sa->sa_data, pcbp->sockdata->node->name);
|
||
|
*addr = sa;
|
||
|
} else
|
||
|
*addr = NULL; /* XXX check this makes sense */
|
||
|
return (0);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Attach a socket to it's protocol specific partner.
|
||
|
* For a control socket, actually create a netgraph node and attach
|
||
|
* to it as well.
|
||
|
*/
|
||
|
|
||
|
static int
|
||
|
ng_attach_cntl(struct socket *so)
|
||
|
{
|
||
|
struct ngsock *privdata;
|
||
|
struct ngpcb *pcbp;
|
||
|
int error;
|
||
|
|
||
|
/* Setup protocol control block */
|
||
|
if ((error = ng_attach_common(so, NG_CONTROL)) != 0)
|
||
|
return (error);
|
||
|
pcbp = (struct ngpcb *) so->so_pcb;
|
||
|
|
||
|
/* Allocate node private info */
|
||
|
MALLOC(privdata, struct ngsock *,
|
||
|
sizeof(*privdata), M_NETGRAPH, M_WAITOK);
|
||
|
if (privdata == NULL) {
|
||
|
ng_detach_common(pcbp, NG_CONTROL);
|
||
|
return (ENOMEM);
|
||
|
}
|
||
|
bzero(privdata, sizeof(*privdata));
|
||
|
|
||
|
/* Make the generic node components */
|
||
|
if ((error = ng_make_node_common(&typestruct, &privdata->node)) != 0) {
|
||
|
FREE(privdata, M_NETGRAPH);
|
||
|
ng_detach_common(pcbp, NG_CONTROL);
|
||
|
return (error);
|
||
|
}
|
||
|
privdata->node->private = privdata;
|
||
|
|
||
|
/* Link the pcb and the node private data */
|
||
|
privdata->ctlsock = pcbp;
|
||
|
pcbp->sockdata = privdata;
|
||
|
privdata->refs++;
|
||
|
return (0);
|
||
|
}
|
||
|
|
||
|
static int
|
||
|
ng_attach_data(struct socket *so)
|
||
|
{
|
||
|
return(ng_attach_common(so, NG_DATA));
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Set up a socket protocol control block.
|
||
|
* This code is shared between control and data sockets.
|
||
|
*/
|
||
|
static int
|
||
|
ng_attach_common(struct socket *so, int type)
|
||
|
{
|
||
|
struct ngpcb *pcbp;
|
||
|
int error;
|
||
|
|
||
|
/* Standard socket setup stuff */
|
||
|
error = soreserve(so, ngpdg_sendspace, ngpdg_recvspace);
|
||
|
if (error)
|
||
|
return (error);
|
||
|
|
||
|
/* Allocate the pcb */
|
||
|
MALLOC(pcbp, struct ngpcb *, sizeof(*pcbp), M_PCB, M_WAITOK);
|
||
|
if (pcbp == NULL)
|
||
|
return (ENOMEM);
|
||
|
bzero(pcbp, sizeof(*pcbp));
|
||
|
pcbp->type = type;
|
||
|
|
||
|
/* Link the pcb and the socket */
|
||
|
so->so_pcb = (caddr_t) pcbp;
|
||
|
pcbp->ng_socket = so;
|
||
|
|
||
|
/* Add the socket to linked list */
|
||
|
LIST_INSERT_HEAD(&ngsocklist, pcbp, socks);
|
||
|
return (0);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Disassociate the socket from it's protocol specific
|
||
|
* partner. If it's attached to a node's private data structure,
|
||
|
* then unlink from that too. If we were the last socket attached to it,
|
||
|
* then shut down the entire node. Shared code for control and data sockets.
|
||
|
*/
|
||
|
static void
|
||
|
ng_detach_common(struct ngpcb *pcbp, int which)
|
||
|
{
|
||
|
struct ngsock *sockdata;
|
||
|
|
||
|
if (pcbp->sockdata) {
|
||
|
sockdata = pcbp->sockdata;
|
||
|
pcbp->sockdata = NULL;
|
||
|
switch (which) {
|
||
|
case NG_CONTROL:
|
||
|
sockdata->ctlsock = NULL;
|
||
|
break;
|
||
|
case NG_DATA:
|
||
|
sockdata->datasock = NULL;
|
||
|
break;
|
||
|
default:
|
||
|
panic(__FUNCTION__);
|
||
|
}
|
||
|
if ((--sockdata->refs == 0) && (sockdata->node != NULL))
|
||
|
ng_rmnode(sockdata->node);
|
||
|
}
|
||
|
pcbp->ng_socket->so_pcb = NULL;
|
||
|
pcbp->ng_socket = NULL;
|
||
|
LIST_REMOVE(pcbp, socks);
|
||
|
FREE(pcbp, M_PCB);
|
||
|
}
|
||
|
|
||
|
#ifdef NOTYET
|
||
|
/*
|
||
|
* File descriptors can be passed into a AF_NETGRAPH socket.
|
||
|
* Note, that file descriptors cannot be passed OUT.
|
||
|
* Only character device descriptors are accepted.
|
||
|
* Character devices are useful to connect a graph to a device,
|
||
|
* which after all is the purpose of this whole system.
|
||
|
*/
|
||
|
static int
|
||
|
ng_internalize(struct mbuf *control, struct proc *p)
|
||
|
{
|
||
|
struct filedesc *fdp = p->p_fd;
|
||
|
struct cmsghdr *cm = mtod(control, struct cmsghdr *);
|
||
|
struct file *fp;
|
||
|
struct vnode *vn;
|
||
|
int oldfds;
|
||
|
int fd;
|
||
|
|
||
|
if (cm->cmsg_type != SCM_RIGHTS || cm->cmsg_level != SOL_SOCKET ||
|
||
|
cm->cmsg_len != control->m_len) {
|
||
|
TRAP_ERROR;
|
||
|
return (EINVAL);
|
||
|
}
|
||
|
|
||
|
/* Check there is only one FD. XXX what would more than one signify? */
|
||
|
oldfds = (cm->cmsg_len - sizeof(*cm)) / sizeof(int);
|
||
|
if (oldfds != 1) {
|
||
|
TRAP_ERROR;
|
||
|
return (EINVAL);
|
||
|
}
|
||
|
|
||
|
/* Check that the FD given is legit. and change it to a pointer to a
|
||
|
* struct file. */
|
||
|
fd = *(int *) (cm + 1);
|
||
|
if ((unsigned) fd >= fdp->fd_nfiles
|
||
|
|| (fp = fdp->fd_ofiles[fd]) == NULL) {
|
||
|
return (EBADF);
|
||
|
}
|
||
|
|
||
|
/* Depending on what kind of resource it is, act differently. For
|
||
|
* devices, we treat it as a file. For a AF_NETGRAPH socket,
|
||
|
* shortcut straight to the node. */
|
||
|
switch (fp->f_type) {
|
||
|
case DTYPE_VNODE:
|
||
|
vn = (struct vnode *) fp->f_data;
|
||
|
if (vn && (vn->v_type == VCHR)) {
|
||
|
/* for a VCHR, actually reference the FILE */
|
||
|
fp->f_count++;
|
||
|
/* XXX then what :) */
|
||
|
/* how to pass on to other modules? */
|
||
|
} else {
|
||
|
TRAP_ERROR;
|
||
|
return (EINVAL);
|
||
|
}
|
||
|
break;
|
||
|
default:
|
||
|
TRAP_ERROR;
|
||
|
return (EINVAL);
|
||
|
}
|
||
|
return (0);
|
||
|
}
|
||
|
#endif /* NOTYET */
|
||
|
|
||
|
/*
|
||
|
* Connect the data socket to a named control socket node.
|
||
|
*/
|
||
|
static int
|
||
|
ng_connect_data(struct sockaddr *nam, struct ngpcb *pcbp)
|
||
|
{
|
||
|
struct sockaddr_ng *sap;
|
||
|
node_p farnode;
|
||
|
struct ngsock *sockdata;
|
||
|
int error;
|
||
|
|
||
|
/* If we are already connected, don't do it again */
|
||
|
if (pcbp->sockdata != NULL)
|
||
|
return (EISCONN);
|
||
|
|
||
|
/* Find the target (victim) and check it doesn't already have a data
|
||
|
* socket. Also check it is a 'socket' type node. */
|
||
|
sap = (struct sockaddr_ng *) nam;
|
||
|
if ((error = ng_path2node(NULL, sap->sg_data, &farnode, NULL)))
|
||
|
return (error);
|
||
|
|
||
|
if (strcmp(farnode->type->name, NG_SOCKET_NODE_TYPE) != 0)
|
||
|
return (EINVAL);
|
||
|
sockdata = farnode->private;
|
||
|
if (sockdata->datasock != NULL)
|
||
|
return (EADDRINUSE);
|
||
|
|
||
|
/* Link the PCB and the private data struct. and note the extra
|
||
|
* reference */
|
||
|
sockdata->datasock = pcbp;
|
||
|
pcbp->sockdata = sockdata;
|
||
|
sockdata->refs++;
|
||
|
return (0);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Connect the existing control socket node to a named node:hook.
|
||
|
* The hook we use on this end is the same name as the remote node name.
|
||
|
*/
|
||
|
static int
|
||
|
ng_connect_cntl(struct sockaddr *nam, struct ngpcb *pcbp)
|
||
|
{
|
||
|
struct ngsock *const sockdata = pcbp->sockdata;
|
||
|
struct sockaddr_ng *sap;
|
||
|
char *node, *hook;
|
||
|
node_p farnode;
|
||
|
int rtn, error;
|
||
|
|
||
|
sap = (struct sockaddr_ng *) nam;
|
||
|
rtn = ng_path_parse(sap->sg_data, &node, NULL, &hook);
|
||
|
if (rtn < 0 || node == NULL || hook == NULL) {
|
||
|
TRAP_ERROR;
|
||
|
return (EINVAL);
|
||
|
}
|
||
|
farnode = ng_findname(sockdata->node, node);
|
||
|
if (farnode == NULL) {
|
||
|
TRAP_ERROR;
|
||
|
return (EADDRNOTAVAIL);
|
||
|
}
|
||
|
|
||
|
/* Connect, using a hook name the same as the far node name. */
|
||
|
error = ng_con_nodes(sockdata->node, node, farnode, hook);
|
||
|
return error;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Binding a socket means giving the corresponding node a name
|
||
|
*/
|
||
|
static int
|
||
|
ng_bind(struct sockaddr *nam, struct ngpcb *pcbp)
|
||
|
{
|
||
|
struct ngsock *const sockdata = pcbp->sockdata;
|
||
|
struct sockaddr_ng *const sap = (struct sockaddr_ng *) nam;
|
||
|
|
||
|
if (sockdata == NULL) {
|
||
|
TRAP_ERROR;
|
||
|
return (EINVAL);
|
||
|
}
|
||
|
if (sap->sg_len < 3 || sap->sg_data[sap->sg_len - 3] != '\0') {
|
||
|
TRAP_ERROR;
|
||
|
return (EINVAL);
|
||
|
}
|
||
|
return (ng_name_node(sockdata->node, sap->sg_data));
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Take a message and pass it up to the control socket associated
|
||
|
* with the node.
|
||
|
*/
|
||
|
static int
|
||
|
ship_msg(struct ngpcb *pcbp, struct ng_mesg *msg, struct sockaddr_ng *addr)
|
||
|
{
|
||
|
struct socket *const so = pcbp->ng_socket;
|
||
|
struct mbuf *mdata;
|
||
|
int msglen;
|
||
|
|
||
|
/* Copy the message itself into an mbuf chain */
|
||
|
msglen = sizeof(struct ng_mesg) + msg->header.arglen;
|
||
|
mdata = m_devget((caddr_t) msg, msglen, 0, NULL, NULL);
|
||
|
|
||
|
/* Here we free the message, as we are the end of the line.
|
||
|
* We need to do that regardless of whether we got mbufs. */
|
||
|
FREE(msg, M_NETGRAPH);
|
||
|
|
||
|
if (mdata == NULL) {
|
||
|
TRAP_ERROR;
|
||
|
return (ENOBUFS);
|
||
|
}
|
||
|
|
||
|
/* Send it up to the socket */
|
||
|
if (sbappendaddr(&so->so_rcv,
|
||
|
(struct sockaddr *) addr, mdata, NULL) == 0) {
|
||
|
TRAP_ERROR;
|
||
|
m_freem(mdata);
|
||
|
return (ENOBUFS);
|
||
|
}
|
||
|
sorwakeup(so);
|
||
|
return (0);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* You can only create new nodes from the socket end of things.
|
||
|
*/
|
||
|
static int
|
||
|
ngs_constructor(node_p *nodep)
|
||
|
{
|
||
|
return (EINVAL);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* We allow any hook to be connected to the node.
|
||
|
* There is no per-hook private information though.
|
||
|
*/
|
||
|
static int
|
||
|
ngs_newhook(node_p node, hook_p hook, const char *name)
|
||
|
{
|
||
|
hook->private = node->private;
|
||
|
return (0);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Incoming messages get passed up to the control socket.
|
||
|
*/
|
||
|
static int
|
||
|
ngs_rcvmsg(node_p node, struct ng_mesg *msg, const char *retaddr,
|
||
|
struct ng_mesg **resp)
|
||
|
{
|
||
|
struct ngsock *const sockdata = node->private;
|
||
|
struct ngpcb *const pcbp = sockdata->ctlsock;
|
||
|
struct sockaddr_ng *addr;
|
||
|
int addrlen;
|
||
|
int error = 0;
|
||
|
|
||
|
/* Only allow mesgs to be passed if we have the control socket.
|
||
|
* Data sockets can only support the generic messages. */
|
||
|
if (pcbp == NULL) {
|
||
|
TRAP_ERROR;
|
||
|
return (EINVAL);
|
||
|
}
|
||
|
|
||
|
/* Get the return address into a sockaddr */
|
||
|
if ((retaddr == NULL) || (*retaddr == '\0'))
|
||
|
retaddr = "";
|
||
|
addrlen = strlen(retaddr);
|
||
|
MALLOC(addr, struct sockaddr_ng *, addrlen + 4, M_NETGRAPH, M_NOWAIT);
|
||
|
if (addr == NULL) {
|
||
|
TRAP_ERROR;
|
||
|
return (ENOMEM);
|
||
|
}
|
||
|
addr->sg_len = addrlen + 3;
|
||
|
addr->sg_family = AF_NETGRAPH;
|
||
|
bcopy(retaddr, addr->sg_data, addrlen);
|
||
|
addr->sg_data[addrlen] = '\0';
|
||
|
|
||
|
/* Send it up */
|
||
|
error = ship_msg(pcbp, msg, addr);
|
||
|
FREE(addr, M_NETGRAPH);
|
||
|
return (error);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Receive data on a hook
|
||
|
*/
|
||
|
static int
|
||
|
ngs_rcvdata(hook_p hook, struct mbuf *m, meta_p meta)
|
||
|
{
|
||
|
struct ngsock *const sockdata = hook->node->private;
|
||
|
struct ngpcb *const pcbp = sockdata->datasock;
|
||
|
struct socket *so;
|
||
|
struct sockaddr_ng *addr;
|
||
|
char *addrbuf[NG_HOOKLEN + 1 + 4];
|
||
|
int addrlen;
|
||
|
|
||
|
/* If there is no data socket, black-hole it */
|
||
|
if (pcbp == NULL) {
|
||
|
NG_FREE_DATA(m, meta);
|
||
|
return (0);
|
||
|
}
|
||
|
so = pcbp->ng_socket;
|
||
|
|
||
|
/* Get the return address into a sockaddr. */
|
||
|
addrlen = strlen(hook->name); /* <= NG_HOOKLEN */
|
||
|
addr = (struct sockaddr_ng *) addrbuf;
|
||
|
addr->sg_len = addrlen + 3;
|
||
|
addr->sg_family = AF_NETGRAPH;
|
||
|
bcopy(hook->name, addr->sg_data, addrlen);
|
||
|
addr->sg_data[addrlen] = '\0';
|
||
|
|
||
|
/* We have no use for the meta data, free/clear it now. */
|
||
|
NG_FREE_META(meta);
|
||
|
|
||
|
/* Try to tell the socket which hook it came in on */
|
||
|
if (sbappendaddr(&so->so_rcv, (struct sockaddr *) addr, m, NULL) == 0) {
|
||
|
m_freem(m);
|
||
|
TRAP_ERROR;
|
||
|
return (ENOBUFS);
|
||
|
}
|
||
|
sorwakeup(so);
|
||
|
return (0);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Do local shutdown processing.
|
||
|
* In this case, that involves making sure the socket
|
||
|
* knows we should be shutting down.
|
||
|
*/
|
||
|
static int
|
||
|
ngs_rmnode(node_p node)
|
||
|
{
|
||
|
struct ngsock *const sockdata = node->private;
|
||
|
struct ngpcb *const dpcbp = sockdata->datasock;
|
||
|
struct ngpcb *const pcbp = sockdata->ctlsock;
|
||
|
|
||
|
ng_cutlinks(node);
|
||
|
ng_unname(node);
|
||
|
|
||
|
if (dpcbp != NULL) {
|
||
|
soisdisconnected(dpcbp->ng_socket);
|
||
|
dpcbp->sockdata = NULL;
|
||
|
sockdata->datasock = NULL;
|
||
|
sockdata->refs--;
|
||
|
}
|
||
|
if (pcbp != NULL) {
|
||
|
soisdisconnected(pcbp->ng_socket);
|
||
|
pcbp->sockdata = NULL;
|
||
|
sockdata->ctlsock = NULL;
|
||
|
sockdata->refs--;
|
||
|
}
|
||
|
node->private = NULL;
|
||
|
ng_unref(node);
|
||
|
FREE(sockdata, M_NETGRAPH);
|
||
|
return (0);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Control and data socket type descriptors
|
||
|
*/
|
||
|
|
||
|
static struct pr_usrreqs ngc_usrreqs = {
|
||
|
NULL, /* abort */
|
||
|
pru_accept_notsupp,
|
||
|
ngc_attach,
|
||
|
ngc_bind,
|
||
|
ngc_connect,
|
||
|
pru_connect2_notsupp,
|
||
|
pru_control_notsupp,
|
||
|
ngc_detach,
|
||
|
NULL, /* disconnect */
|
||
|
pru_listen_notsupp,
|
||
|
NULL, /* setpeeraddr */
|
||
|
pru_rcvd_notsupp,
|
||
|
pru_rcvoob_notsupp,
|
||
|
ngc_send,
|
||
|
pru_sense_null,
|
||
|
NULL, /* shutdown */
|
||
|
ng_setsockaddr,
|
||
|
sosend,
|
||
|
soreceive,
|
||
|
sopoll
|
||
|
};
|
||
|
|
||
|
static struct pr_usrreqs ngd_usrreqs = {
|
||
|
NULL, /* abort */
|
||
|
pru_accept_notsupp,
|
||
|
ngd_attach,
|
||
|
NULL, /* bind */
|
||
|
ngd_connect,
|
||
|
pru_connect2_notsupp,
|
||
|
pru_control_notsupp,
|
||
|
ngd_detach,
|
||
|
NULL, /* disconnect */
|
||
|
pru_listen_notsupp,
|
||
|
NULL, /* setpeeraddr */
|
||
|
pru_rcvd_notsupp,
|
||
|
pru_rcvoob_notsupp,
|
||
|
ngd_send,
|
||
|
pru_sense_null,
|
||
|
NULL, /* shutdown */
|
||
|
ng_setsockaddr,
|
||
|
sosend,
|
||
|
soreceive,
|
||
|
sopoll
|
||
|
};
|
||
|
|
||
|
/*
|
||
|
* Definitions of protocols supported in the NETGRAPH domain.
|
||
|
*/
|
||
|
|
||
|
extern struct domain ngdomain; /* stop compiler warnings */
|
||
|
|
||
|
static struct protosw ngsw[] = {
|
||
|
{
|
||
|
SOCK_DGRAM,
|
||
|
&ngdomain,
|
||
|
NG_CONTROL,
|
||
|
PR_ATOMIC | PR_ADDR /* | PR_RIGHTS */,
|
||
|
0, 0, 0, 0,
|
||
|
NULL,
|
||
|
0, 0, 0, 0,
|
||
|
&ngc_usrreqs
|
||
|
},
|
||
|
{
|
||
|
SOCK_DGRAM,
|
||
|
&ngdomain,
|
||
|
NG_DATA,
|
||
|
PR_ATOMIC | PR_ADDR,
|
||
|
0, 0, 0, 0,
|
||
|
NULL,
|
||
|
0, 0, 0, 0,
|
||
|
&ngd_usrreqs
|
||
|
}
|
||
|
};
|
||
|
|
||
|
struct domain ngdomain = {
|
||
|
AF_NETGRAPH,
|
||
|
"netgraph",
|
||
|
0,
|
||
|
NULL,
|
||
|
NULL,
|
||
|
ngsw,
|
||
|
&ngsw[sizeof(ngsw) / sizeof(ngsw[0])],
|
||
|
0,
|
||
|
NULL,
|
||
|
0,
|
||
|
0
|
||
|
};
|
||
|
|
||
|
/*
|
||
|
* Handle loading and unloading for this node type
|
||
|
* This is to handle auxiliary linkages (e.g protocol domain addition).
|
||
|
*/
|
||
|
static int
|
||
|
ngs_mod_event(module_t mod, int event, void *data)
|
||
|
{
|
||
|
int error = 0;
|
||
|
|
||
|
switch (event) {
|
||
|
case MOD_LOAD:
|
||
|
/* Register protocol domain */
|
||
|
net_add_domain(&ngdomain);
|
||
|
break;
|
||
|
case MOD_UNLOAD:
|
||
|
/* Insure there are no open netgraph sockets */
|
||
|
if (!LIST_EMPTY(&ngsocklist)) {
|
||
|
error = EBUSY;
|
||
|
break;
|
||
|
}
|
||
|
|
||
|
#ifdef NOTYET
|
||
|
/* Unregister protocol domain XXX can't do this yet.. */
|
||
|
if ((error = net_rm_domain(&ngdomain)) != 0)
|
||
|
break;
|
||
|
#else
|
||
|
error = EBUSY;
|
||
|
#endif
|
||
|
break;
|
||
|
default:
|
||
|
error = EOPNOTSUPP;
|
||
|
break;
|
||
|
}
|
||
|
return (error);
|
||
|
}
|
||
|
|
||
|
SYSCTL_NODE(_net, AF_NETGRAPH, graph, CTLFLAG_RW, 0, "netgraph Family");
|
||
|
SYSCTL_INT(_net_graph, OID_AUTO, family, CTLFLAG_RD, 0, AF_NETGRAPH, "");
|
||
|
SYSCTL_NODE(_net_graph, OID_AUTO, data, CTLFLAG_RW, 0, "DATA");
|
||
|
SYSCTL_INT(_net_graph_data, OID_AUTO, proto, CTLFLAG_RD, 0, NG_DATA, "");
|
||
|
SYSCTL_NODE(_net_graph, OID_AUTO, control, CTLFLAG_RW, 0, "CONTROL");
|
||
|
SYSCTL_INT(_net_graph_control, OID_AUTO, proto, CTLFLAG_RD, 0, NG_CONTROL, "");
|
||
|
|