/*
* 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@freebsd.org>
* $Whistle: ng_socket.c,v 1.28 1999/11/01 09:24:52 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/domain.h>
#include <sys/hash.h>
#include <sys/kernel.h>
#include <sys/linker.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/mutex.h>
#include <sys/proc.h>
#include <sys/epoch.h>
#include <sys/priv.h>
#include <sys/protosw.h>
#include <sys/queue.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/syscallsubr.h>
#include <sys/sysctl.h>
#include <net/vnet.h>
#include <netgraph/ng_message.h>
#include <netgraph/netgraph.h>
#include <netgraph/ng_socketvar.h>
#include <netgraph/ng_socket.h>
#ifdef NG_SEPARATE_MALLOC
static MALLOC_DEFINE(M_NETGRAPH_PATH, "netgraph_path", "netgraph path info");
static MALLOC_DEFINE(M_NETGRAPH_SOCK, "netgraph_sock", "netgraph socket info");
#else
#define M_NETGRAPH_PATH M_NETGRAPH
#define M_NETGRAPH_SOCK M_NETGRAPH
#endif
/*
* 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 ng_constructor_t ngs_constructor;
static ng_rcvmsg_t ngs_rcvmsg;
static ng_shutdown_t ngs_shutdown;
static ng_newhook_t ngs_newhook;
static ng_connect_t ngs_connect;
static ng_findhook_t ngs_findhook;
static ng_rcvdata_t ngs_rcvdata;
static ng_disconnect_t ngs_disconnect;
/* 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 void ng_socket_free_priv(struct ngsock *priv);
static int ng_connect_data(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 void ng_socket_item_applied(void *context, int error);
/* Netgraph type descriptor */
static struct ng_type typestruct = {
.version = NG_ABI_VERSION,
.name = NG_SOCKET_NODE_TYPE,
.mod_event = ngs_mod_event,
.constructor = ngs_constructor,
.rcvmsg = ngs_rcvmsg,
.shutdown = ngs_shutdown,
.newhook = ngs_newhook,
.connect = ngs_connect,
.findhook = ngs_findhook,
.rcvdata = ngs_rcvdata,
.disconnect = ngs_disconnect,
};
NETGRAPH_INIT_ORDERED(socket, &typestruct, SI_SUB_PROTO_DOMAIN, SI_ORDER_ANY);
/* Buffer space */
static u_long ngpdg_sendspace = 20 * 1024; /* really max datagram size */
SYSCTL_ULONG(_net_graph, OID_AUTO, maxdgram, CTLFLAG_RW,
&ngpdg_sendspace , 0, "Maximum outgoing Netgraph datagram size");
static u_long ngpdg_recvspace = 20 * 1024;
SYSCTL_ULONG(_net_graph, OID_AUTO, recvspace, CTLFLAG_RW,
&ngpdg_recvspace , 0, "Maximum space for incoming Netgraph datagrams");
/* List of all sockets (for netstat -f netgraph) */
static LIST_HEAD(, ngpcb) ngsocklist;
static struct mtx ngsocketlist_mtx;
#define sotongpcb(so) ((struct ngpcb *)(so)->so_pcb)
/* If getting unexplained errors returned, set this to "kdb_enter("X"); */
#ifndef TRAP_ERROR
#define TRAP_ERROR
#endif
struct hookpriv {
LIST_ENTRY(hookpriv) next;
hook_p hook;
};
LIST_HEAD(ngshash, hookpriv);
/* Per-node private data */
struct ngsock {
struct ng_node *node; /* the associated netgraph node */
struct ngpcb *datasock; /* optional data socket */
struct ngpcb *ctlsock; /* optional control socket */
struct ngshash *hash; /* hash for hook names */
u_long hmask; /* hash mask */
int flags;
int refs;
struct mtx mtx; /* mtx to wait on */
int error; /* place to store error */
};
#define NGS_FLAG_NOLINGER 1 /* close with last hook */
/***************************************************************
Control sockets
***************************************************************/
static int
ngc_attach(struct socket *so, int proto, struct thread *td)
{
struct ngpcb *const pcbp = sotongpcb(so);
int error;
error = priv_check(td, PRIV_NETGRAPH_CONTROL);
if (error)
return (error);
if (pcbp != NULL)
return (EISCONN);
return (ng_attach_cntl(so));
}
static void
ngc_detach(struct socket *so)
{
struct ngpcb *const pcbp = sotongpcb(so);
KASSERT(pcbp != NULL, ("ngc_detach: pcbp == NULL"));
ng_detach_common(pcbp, NG_CONTROL);
}
static int
ngc_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
struct mbuf *control, struct thread *td)
{
struct ngpcb *const pcbp = sotongpcb(so);
struct ngsock *const priv = NG_NODE_PRIVATE(pcbp->sockdata->node);
struct sockaddr_ng *const sap = (struct sockaddr_ng *) addr;
struct ng_mesg *msg;
struct mbuf *m0;
item_p item;
char *path = NULL;
int len, error = 0;
struct ng_apply_info apply;
if (control) {
error = EINVAL;
goto release;
}
/* Require destination as there may be >= 1 hooks on this node. */
if (addr == NULL) {
error = EDESTADDRREQ;
goto release;
}
if (sap->sg_len > NG_NODESIZ + offsetof(struct sockaddr_ng, sg_data)) {
error = EINVAL;
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 - offsetof(struct sockaddr_ng, sg_data);
path = malloc(len + 1, M_NETGRAPH_PATH, M_WAITOK);
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.
*/
msg = malloc(len + 1, M_NETGRAPH_MSG, M_WAITOK);
m_copydata(m, 0, len, (char *)msg);
if (msg->header.version != NG_VERSION) {
free(msg, M_NETGRAPH_MSG);
error = EINVAL;
goto release;
}
/*
* Hack alert!
* We look into the message and if it mkpeers a node of unknown type, we
* try to load it. We need to do this now, in syscall thread, because if
* message gets queued and applied later we will get panic.
*/
if (msg->header.typecookie == NGM_GENERIC_COOKIE &&
msg->header.cmd == NGM_MKPEER) {
struct ngm_mkpeer *const mkp = (struct ngm_mkpeer *) msg->data;
if (ng_findtype(mkp->type) == NULL) {
char filename[NG_TYPESIZ + 3];
int fileid;
/* Not found, try to load it as a loadable module. */
snprintf(filename, sizeof(filename), "ng_%s",
mkp->type);
error = kern_kldload(curthread, filename, &fileid);
if (error != 0) {
free(msg, M_NETGRAPH_MSG);
goto release;
}
/* See if type has been loaded successfully. */
if (ng_findtype(mkp->type) == NULL) {
free(msg, M_NETGRAPH_MSG);
(void)kern_kldunload(curthread, fileid,
LINKER_UNLOAD_NORMAL);
error = ENXIO;
goto release;
}
}
}
item = ng_package_msg(msg, NG_WAITOK);
if ((error = ng_address_path((pcbp->sockdata->node), item, path, 0))
!= 0) {
#ifdef TRACE_MESSAGES
printf("ng_address_path: errx=%d\n", error);
#endif
goto release;
}
#ifdef TRACE_MESSAGES
printf("[%x]:<---------[socket]: c=<%d>cmd=%x(%s) f=%x #%d (%s)\n",
item->el_dest->nd_ID,
msg->header.typecookie,
msg->header.cmd,
msg->header.cmdstr,
msg->header.flags,
msg->header.token,
item->el_dest->nd_type->name);
#endif
SAVE_LINE(item);
/*
* We do not want to return from syscall until the item
* is processed by destination node. We register callback
* on the item, which will update priv->error when item
* was applied.
* If ng_snd_item() has queued item, we sleep until
* callback wakes us up.
*/
bzero(&apply, sizeof(apply));
apply.apply = ng_socket_item_applied;
apply.context = priv;
item->apply = &apply;
priv->error = -1;
error = ng_snd_item(item, 0);
mtx_lock(&priv->mtx);
if (priv->error == -1)
msleep(priv, &priv->mtx, 0, "ngsock", 0);
mtx_unlock(&priv->mtx);
KASSERT(priv->error != -1,
("ng_socket: priv->error wasn't updated"));
error = priv->error;
release:
if (path != NULL)
free(path, M_NETGRAPH_PATH);
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 thread *td)
{
struct ngpcb *const pcbp = sotongpcb(so);
if (pcbp == NULL)
return (EINVAL);
return (ng_bind(nam, pcbp));
}
static int
ngc_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
{
/*
* At this time refuse to do this.. it used to
* do something but it was undocumented and not used.
*/
printf("program tried to connect control socket to remote node\n");
return (EINVAL);
}
/***************************************************************
Data sockets
***************************************************************/
static int
ngd_attach(struct socket *so, int proto, struct thread *td)
{
struct ngpcb *const pcbp = sotongpcb(so);
if (pcbp != NULL)
return (EISCONN);
return (ng_attach_data(so));
}
static void
ngd_detach(struct socket *so)
{
struct ngpcb *const pcbp = sotongpcb(so);
KASSERT(pcbp != NULL, ("ngd_detach: pcbp == NULL"));
ng_detach_common(pcbp, NG_DATA);
}
static int
ngd_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
struct mbuf *control, struct thread *td)
{
struct epoch_tracker et;
struct ngpcb *const pcbp = sotongpcb(so);
struct sockaddr_ng *const sap = (struct sockaddr_ng *) addr;
int len, error;
hook_p hook = NULL;
item_p item;
char hookname[NG_HOOKSIZ];
if ((pcbp == NULL) || (control != NULL)) {
error = EINVAL;
goto release;
}
if (pcbp->sockdata == NULL) {
error = ENOTCONN;
goto release;
}
if (sap == NULL) {
len = 0; /* Make compiler happy. */
} else {
if (sap->sg_len > NG_NODESIZ +
offsetof(struct sockaddr_ng, sg_data)) {
error = EINVAL;
goto release;
}
len = sap->sg_len - offsetof(struct sockaddr_ng, sg_data);
}
/*
* If the user used any of these ways to not specify an address
* then handle specially.
*/
if ((sap == NULL) || (len <= 0) || (*sap->sg_data == '\0')) {
if (NG_NODE_NUMHOOKS(pcbp->sockdata->node) != 1) {
error = EDESTADDRREQ;
goto release;
}
/*
* If exactly one hook exists, just use it.
* Special case to allow write(2) to work on an ng_socket.
*/
hook = LIST_FIRST(&pcbp->sockdata->node->nd_hooks);
} else {
if (len >= NG_HOOKSIZ) {
error = EINVAL;
goto release;
}
/*
* chop off the sockaddr header, and make sure it's NUL
* terminated
*/
bcopy(sap->sg_data, hookname, len);
hookname[len] = '\0';
/* Find the correct hook from 'hookname' */
hook = ng_findhook(pcbp->sockdata->node, hookname);
if (hook == NULL) {
error = EHOSTUNREACH;
goto release;
}
}
/* Send data. */
item = ng_package_data(m, NG_WAITOK);
m = NULL;
NET_EPOCH_ENTER(et);
NG_FWD_ITEM_HOOK(error, item, hook);
NET_EPOCH_EXIT(et);
release:
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 thread *td)
{
struct ngpcb *const pcbp = sotongpcb(so);
if (pcbp == NULL)
return (EINVAL);
return (ng_connect_data(nam, pcbp));
}
/*
* Used for both data and control sockets
*/
static int
ng_getsockaddr(struct socket *so, struct sockaddr **addr)
{
struct ngpcb *pcbp;
struct sockaddr_ng *sg;
int sg_len;
int error = 0;
pcbp = sotongpcb(so);
if ((pcbp == NULL) || (pcbp->sockdata == NULL))
/* XXXGL: can this still happen? */
return (EINVAL);
sg_len = sizeof(struct sockaddr_ng) + NG_NODESIZ -
sizeof(sg->sg_data);
sg = malloc(sg_len, M_SONAME, M_WAITOK | M_ZERO);
mtx_lock(&pcbp->sockdata->mtx);
if (pcbp->sockdata->node != NULL) {
node_p node = pcbp->sockdata->node;
if (NG_NODE_HAS_NAME(node))
bcopy(NG_NODE_NAME(node), sg->sg_data,
strlen(NG_NODE_NAME(node)));
mtx_unlock(&pcbp->sockdata->mtx);
sg->sg_len = sg_len;
sg->sg_family = AF_NETGRAPH;
*addr = (struct sockaddr *)sg;
} else {
mtx_unlock(&pcbp->sockdata->mtx);
free(sg, M_SONAME);
error = EINVAL;
}
return (error);
}
/*
* 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 *priv;
struct ngpcb *pcbp;
node_p node;
int error;
/* Setup protocol control block */
if ((error = ng_attach_common(so, NG_CONTROL)) != 0)
return (error);
pcbp = sotongpcb(so);
/* Make the generic node components */
if ((error = ng_make_node_common(&typestruct, &node)) != 0) {
ng_detach_common(pcbp, NG_CONTROL);
return (error);
}
/*
* Allocate node private info and hash. We start
* with 16 hash entries, however we may grow later
* in ngs_newhook(). We can't predict how much hooks
* does this node plan to have.
*/
priv = malloc(sizeof(*priv), M_NETGRAPH_SOCK, M_WAITOK | M_ZERO);
priv->hash = hashinit(16, M_NETGRAPH_SOCK, &priv->hmask);
/* Initialize mutex. */
mtx_init(&priv->mtx, "ng_socket", NULL, MTX_DEF);
/* Link the pcb the private data. */
priv->ctlsock = pcbp;
pcbp->sockdata = priv;
priv->refs++;
priv->node = node;
pcbp->node_id = node->nd_ID; /* hint for netstat(1) */
/* Link the node and the private data. */
NG_NODE_SET_PRIVATE(priv->node, priv);
NG_NODE_REF(priv->node);
priv->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. */
pcbp = malloc(sizeof(struct ngpcb), M_PCB, M_WAITOK | M_ZERO);
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 */
mtx_lock(&ngsocketlist_mtx);
LIST_INSERT_HEAD(&ngsocklist, pcbp, socks);
mtx_unlock(&ngsocketlist_mtx);
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 *priv = pcbp->sockdata;
if (priv != NULL) {
mtx_lock(&priv->mtx);
switch (which) {
case NG_CONTROL:
priv->ctlsock = NULL;
break;
case NG_DATA:
priv->datasock = NULL;
break;
default:
panic("%s", __func__);
}
pcbp->sockdata = NULL;
pcbp->node_id = 0;
ng_socket_free_priv(priv);
}
pcbp->ng_socket->so_pcb = NULL;
mtx_lock(&ngsocketlist_mtx);
LIST_REMOVE(pcbp, socks);
mtx_unlock(&ngsocketlist_mtx);
free(pcbp, M_PCB);
}
/*
* Remove a reference from node private data.
*/
static void
ng_socket_free_priv(struct ngsock *priv)
{
mtx_assert(&priv->mtx, MA_OWNED);
priv->refs--;
if (priv->refs == 0) {
mtx_destroy(&priv->mtx);
hashdestroy(priv->hash, M_NETGRAPH_SOCK, priv->hmask);
free(priv, M_NETGRAPH_SOCK);
return;
}
if ((priv->refs == 1) && (priv->node != NULL)) {
node_p node = priv->node;
priv->node = NULL;
mtx_unlock(&priv->mtx);
NG_NODE_UNREF(node);
ng_rmnode_self(node);
} else
mtx_unlock(&priv->mtx);
}
/*
* 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 *priv;
int error;
item_p item;
/* 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.
* Use ng_package_data() and ng_address_path() to do this.
*/
sap = (struct sockaddr_ng *) nam;
/* The item will hold the node reference. */
item = ng_package_data(NULL, NG_WAITOK);
if ((error = ng_address_path(NULL, item, sap->sg_data, 0)))
return (error); /* item is freed on failure */
/*
* Extract node from item and free item. Remember we now have
* a reference on the node. The item holds it for us.
* when we free the item we release the reference.
*/
farnode = item->el_dest; /* shortcut */
if (strcmp(farnode->nd_type->name, NG_SOCKET_NODE_TYPE) != 0) {
NG_FREE_ITEM(item); /* drop the reference to the node */
return (EINVAL);
}
priv = NG_NODE_PRIVATE(farnode);
if (priv->datasock != NULL) {
NG_FREE_ITEM(item); /* drop the reference to the node */
return (EADDRINUSE);
}
/*
* Link the PCB and the private data struct. and note the extra
* reference. Drop the extra reference on the node.
*/
mtx_lock(&priv->mtx);
priv->datasock = pcbp;
pcbp->sockdata = priv;
pcbp->node_id = priv->node->nd_ID; /* hint for netstat(1) */
priv->refs++;
mtx_unlock(&priv->mtx);
NG_FREE_ITEM(item); /* drop the reference to the node */
return (0);
}
/*
* Binding a socket means giving the corresponding node a name
*/
static int
ng_bind(struct sockaddr *nam, struct ngpcb *pcbp)
{
struct ngsock *const priv = pcbp->sockdata;
struct sockaddr_ng *const sap = (struct sockaddr_ng *) nam;
if (priv == NULL) {
TRAP_ERROR;
return (EINVAL);
}
if ((sap->sg_len < 4) || (sap->sg_len > (NG_NODESIZ + 2)) ||
(sap->sg_data[0] == '\0') ||
(sap->sg_data[sap->sg_len - 3] != '\0')) {
TRAP_ERROR;
return (EINVAL);
}
return (ng_name_node(priv->node, sap->sg_data));
}
/***************************************************************
Netgraph node
***************************************************************/
/*
* You can only create new nodes from the socket end of things.
*/
static int
ngs_constructor(node_p nodep)
{
return (EINVAL);
}
static void
ngs_rehash(node_p node)
{
struct ngsock *priv = NG_NODE_PRIVATE(node);
struct ngshash *new;
struct hookpriv *hp;
hook_p hook;
uint32_t h;
u_long hmask;
new = hashinit_flags((priv->hmask + 1) * 2, M_NETGRAPH_SOCK, &hmask,
HASH_NOWAIT);
if (new == NULL)
return;
LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) {
hp = NG_HOOK_PRIVATE(hook);
#ifdef INVARIANTS
LIST_REMOVE(hp, next);
#endif
h = hash32_str(NG_HOOK_NAME(hook), HASHINIT) & hmask;
LIST_INSERT_HEAD(&new[h], hp, next);
}
hashdestroy(priv->hash, M_NETGRAPH_SOCK, priv->hmask);
priv->hash = new;
priv->hmask = hmask;
}
/*
* 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)
{
struct ngsock *const priv = NG_NODE_PRIVATE(node);
struct hookpriv *hp;
uint32_t h;
hp = malloc(sizeof(*hp), M_NETGRAPH_SOCK, M_NOWAIT);
if (hp == NULL)
return (ENOMEM);
if (node->nd_numhooks * 2 > priv->hmask)
ngs_rehash(node);
hp->hook = hook;
h = hash32_str(name, HASHINIT) & priv->hmask;
LIST_INSERT_HEAD(&priv->hash[h], hp, next);
NG_HOOK_SET_PRIVATE(hook, hp);
return (0);
}
/*
* If only one hook, allow read(2) and write(2) to work.
*/
static int
ngs_connect(hook_p hook)
{
node_p node = NG_HOOK_NODE(hook);
struct ngsock *priv = NG_NODE_PRIVATE(node);
if ((priv->datasock) && (priv->datasock->ng_socket)) {
if (NG_NODE_NUMHOOKS(node) == 1)
priv->datasock->ng_socket->so_state |= SS_ISCONNECTED;
else
priv->datasock->ng_socket->so_state &= ~SS_ISCONNECTED;
}
return (0);
}
/* Look up hook by name */
static hook_p
ngs_findhook(node_p node, const char *name)
{
struct ngsock *priv = NG_NODE_PRIVATE(node);
struct hookpriv *hp;
uint32_t h;
/*
* Microoptimisation for an ng_socket with
* a single hook, which is a common case.
*/
if (node->nd_numhooks == 1) {
hook_p hook;
hook = LIST_FIRST(&node->nd_hooks);
if (strcmp(NG_HOOK_NAME(hook), name) == 0)
return (hook);
else
return (NULL);
}
h = hash32_str(name, HASHINIT) & priv->hmask;
LIST_FOREACH(hp, &priv->hash[h], next)
if (strcmp(NG_HOOK_NAME(hp->hook), name) == 0)
return (hp->hook);
return (NULL);
}
/*
* Incoming messages get passed up to the control socket.
* Unless they are for us specifically (socket_type)
*/
static int
ngs_rcvmsg(node_p node, item_p item, hook_p lasthook)
{
struct ngsock *const priv = NG_NODE_PRIVATE(node);
struct ngpcb *pcbp;
struct socket *so;
struct sockaddr_ng addr;
struct ng_mesg *msg;
struct mbuf *m;
ng_ID_t retaddr = NGI_RETADDR(item);
int addrlen;
int error = 0;
NGI_GET_MSG(item, msg);
NG_FREE_ITEM(item);
/*
* Grab priv->mtx here to prevent destroying of control socket
* after checking that priv->ctlsock is not NULL.
*/
mtx_lock(&priv->mtx);
pcbp = priv->ctlsock;
/*
* Only allow mesgs to be passed if we have the control socket.
* Data sockets can only support the generic messages.
*/
if (pcbp == NULL) {
mtx_unlock(&priv->mtx);
TRAP_ERROR;
NG_FREE_MSG(msg);
return (EINVAL);
}
so = pcbp->ng_socket;
SOCKBUF_LOCK(&so->so_rcv);
/* As long as the race is handled, priv->mtx may be unlocked now. */
mtx_unlock(&priv->mtx);
#ifdef TRACE_MESSAGES
printf("[%x]:---------->[socket]: c=<%d>cmd=%x(%s) f=%x #%d\n",
retaddr,
msg->header.typecookie,
msg->header.cmd,
msg->header.cmdstr,
msg->header.flags,
msg->header.token);
#endif
if (msg->header.typecookie == NGM_SOCKET_COOKIE) {
switch (msg->header.cmd) {
case NGM_SOCK_CMD_NOLINGER:
priv->flags |= NGS_FLAG_NOLINGER;
break;
case NGM_SOCK_CMD_LINGER:
priv->flags &= ~NGS_FLAG_NOLINGER;
break;
default:
error = EINVAL; /* unknown command */
}
SOCKBUF_UNLOCK(&so->so_rcv);
/* Free the message and return. */
NG_FREE_MSG(msg);
return (error);
}
/* Get the return address into a sockaddr. */
bzero(&addr, sizeof(addr));
addr.sg_len = sizeof(addr);
addr.sg_family = AF_NETGRAPH;
addrlen = snprintf((char *)&addr.sg_data, sizeof(addr.sg_data),
"[%x]:", retaddr);
if (addrlen < 0 || addrlen > sizeof(addr.sg_data)) {
SOCKBUF_UNLOCK(&so->so_rcv);
printf("%s: snprintf([%x]) failed - %d\n", __func__, retaddr,
addrlen);
NG_FREE_MSG(msg);
return (EINVAL);
}
/* Copy the message itself into an mbuf chain. */
m = m_devget((caddr_t)msg, sizeof(struct ng_mesg) + msg->header.arglen,
0, NULL, NULL);
/*
* Here we free the message. We need to do that
* regardless of whether we got mbufs.
*/
NG_FREE_MSG(msg);
if (m == NULL) {
SOCKBUF_UNLOCK(&so->so_rcv);
TRAP_ERROR;
return (ENOBUFS);
}
/* Send it up to the socket. */
if (sbappendaddr_locked(&so->so_rcv, (struct sockaddr *)&addr, m,
NULL) == 0) {
soroverflow_locked(so);
TRAP_ERROR;
m_freem(m);
return (ENOBUFS);
}
/* sorwakeup_locked () releases the lock internally. */
sorwakeup_locked(so);
return (error);
}
/*
* Receive data on a hook
*/
static int
ngs_rcvdata(hook_p hook, item_p item)
{
struct ngsock *const priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
struct ngpcb *const pcbp = priv->datasock;
struct socket *so;
struct sockaddr_ng *addr;
char *addrbuf[NG_HOOKSIZ + 4];
int addrlen;
struct mbuf *m;
NGI_GET_M(item, m);
NG_FREE_ITEM(item);
/* If there is no data socket, black-hole it. */
if (pcbp == NULL) {
NG_FREE_M(m);
return (0);
}
so = pcbp->ng_socket;
/* Get the return address into a sockaddr. */
addrlen = strlen(NG_HOOK_NAME(hook)); /* <= NG_HOOKSIZ - 1 */
addr = (struct sockaddr_ng *) addrbuf;
addr->sg_len = addrlen + 3;
addr->sg_family = AF_NETGRAPH;
bcopy(NG_HOOK_NAME(hook), addr->sg_data, addrlen);
addr->sg_data[addrlen] = '\0';
/* Try to tell the socket which hook it came in on. */
SOCKBUF_LOCK(&so->so_rcv);
if (sbappendaddr_locked(&so->so_rcv, (struct sockaddr *)addr, m,
NULL) == 0) {
SOCKBUF_UNLOCK(&so->so_rcv);
m_freem(m);
TRAP_ERROR;
return (ENOBUFS);
}
/* sorwakeup_locked () releases the lock internally. */
sorwakeup_locked(so);
return (0);
}
/*
* Hook disconnection
*
* For this type, removal of the last link destroys the node
* if the NOLINGER flag is set.
*/
static int
ngs_disconnect(hook_p hook)
{
node_p node = NG_HOOK_NODE(hook);
struct ngsock *const priv = NG_NODE_PRIVATE(node);
struct hookpriv *hp = NG_HOOK_PRIVATE(hook);
LIST_REMOVE(hp, next);
free(hp, M_NETGRAPH_SOCK);
if ((priv->datasock) && (priv->datasock->ng_socket)) {
if (NG_NODE_NUMHOOKS(node) == 1)
priv->datasock->ng_socket->so_state |= SS_ISCONNECTED;
else
priv->datasock->ng_socket->so_state &= ~SS_ISCONNECTED;
}
if ((priv->flags & NGS_FLAG_NOLINGER) &&
(NG_NODE_NUMHOOKS(node) == 0) && (NG_NODE_IS_VALID(node)))
ng_rmnode_self(node);
return (0);
}
/*
* Do local shutdown processing.
* In this case, that involves making sure the socket
* knows we should be shutting down.
*/
static int
ngs_shutdown(node_p node)
{
struct ngsock *const priv = NG_NODE_PRIVATE(node);
struct ngpcb *dpcbp, *pcbp;
mtx_lock(&priv->mtx);
dpcbp = priv->datasock;
pcbp = priv->ctlsock;
if (dpcbp != NULL)
soisdisconnected(dpcbp->ng_socket);
if (pcbp != NULL)
soisdisconnected(pcbp->ng_socket);
priv->node = NULL;
NG_NODE_SET_PRIVATE(node, NULL);
ng_socket_free_priv(priv);
NG_NODE_UNREF(node);
return (0);
}
static void
ng_socket_item_applied(void *context, int error)
{
struct ngsock *const priv = (struct ngsock *)context;
mtx_lock(&priv->mtx);
priv->error = error;
wakeup(priv);
mtx_unlock(&priv->mtx);
}
static int
dummy_disconnect(struct socket *so)
{
return (0);
}
/*
* Definitions of protocols supported in the NETGRAPH domain.
* Control and data socket type descriptors
*
* XXXRW: Perhaps _close should do something?
*/
static struct protosw ngcontrol_protosw = {
.pr_type = SOCK_DGRAM,
.pr_protocol = NG_CONTROL,
.pr_flags = PR_ATOMIC | PR_ADDR /* | PR_RIGHTS */,
.pr_attach = ngc_attach,
.pr_bind = ngc_bind,
.pr_connect = ngc_connect,
.pr_detach = ngc_detach,
.pr_disconnect = dummy_disconnect,
.pr_send = ngc_send,
.pr_sockaddr = ng_getsockaddr,
};
static struct protosw ngdata_protosw = {
.pr_type = SOCK_DGRAM,
.pr_protocol = NG_DATA,
.pr_flags = PR_ATOMIC | PR_ADDR,
.pr_attach = ngd_attach,
.pr_connect = ngd_connect,
.pr_detach = ngd_detach,
.pr_disconnect = dummy_disconnect,
.pr_send = ngd_send,
.pr_sockaddr = ng_getsockaddr,
};
static struct domain ngdomain = {
.dom_family = AF_NETGRAPH,
.dom_name = "netgraph",
.dom_nprotosw = 2,
.dom_protosw = { &ngcontrol_protosw, &ngdata_protosw },
};
/*
* 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:
mtx_init(&ngsocketlist_mtx, "ng_socketlist", NULL, MTX_DEF);
break;
case MOD_UNLOAD:
/* Ensure there are no open netgraph sockets. */
if (!LIST_EMPTY(&ngsocklist)) {
error = EBUSY;
break;
}
#ifdef NOTYET
/* Unregister protocol domain XXX can't do this yet.. */
#endif
error = EBUSY;
break;
default:
error = EOPNOTSUPP;
break;
}
return (error);
}
DOMAIN_SET(ng);
SYSCTL_INT(_net_graph, OID_AUTO, family, CTLFLAG_RD, SYSCTL_NULL_INT_PTR, AF_NETGRAPH, "");
static SYSCTL_NODE(_net_graph, OID_AUTO, data, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
"DATA");
SYSCTL_INT(_net_graph_data, OID_AUTO, proto, CTLFLAG_RD, SYSCTL_NULL_INT_PTR, NG_DATA, "");
static SYSCTL_NODE(_net_graph, OID_AUTO, control, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
"CONTROL");
SYSCTL_INT(_net_graph_control, OID_AUTO, proto, CTLFLAG_RD, SYSCTL_NULL_INT_PTR, NG_CONTROL, "");
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