mirror of
https://git.FreeBSD.org/src.git
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8338a34a82
Reported & tested by: Mykola Dzham <i levsha.me>
1208 lines
30 KiB
C
1208 lines
30 KiB
C
/*
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* ng_socket.c
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*/
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/*-
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* Copyright (c) 1996-1999 Whistle Communications, Inc.
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* All rights reserved.
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*
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* Subject to the following obligations and disclaimer of warranty, use and
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* redistribution of this software, in source or object code forms, with or
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* without modifications are expressly permitted by Whistle Communications;
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* provided, however, that:
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* 1. Any and all reproductions of the source or object code must include the
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* copyright notice above and the following disclaimer of warranties; and
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* 2. No rights are granted, in any manner or form, to use Whistle
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* Communications, Inc. trademarks, including the mark "WHISTLE
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* COMMUNICATIONS" on advertising, endorsements, or otherwise except as
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* such appears in the above copyright notice or in the software.
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*
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* THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
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* TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
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* REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
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* INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
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* WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
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* REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
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* SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
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* IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
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* RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
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* WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
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* PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*
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* Author: Julian Elischer <julian@freebsd.org>
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*
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* $FreeBSD$
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* $Whistle: ng_socket.c,v 1.28 1999/11/01 09:24:52 julian Exp $
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*/
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/*
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* Netgraph socket nodes
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*
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* There are two types of netgraph sockets, control and data.
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* Control sockets have a netgraph node, but data sockets are
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* parasitic on control sockets, and have no node of their own.
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*/
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#include <sys/param.h>
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#include <sys/domain.h>
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#include <sys/hash.h>
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#include <sys/kernel.h>
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#include <sys/linker.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/mutex.h>
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#include <sys/priv.h>
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#include <sys/protosw.h>
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#include <sys/queue.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/syscallsubr.h>
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#include <sys/sysctl.h>
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#include <net/vnet.h>
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#include <netgraph/ng_message.h>
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#include <netgraph/netgraph.h>
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#include <netgraph/ng_socketvar.h>
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#include <netgraph/ng_socket.h>
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#ifdef NG_SEPARATE_MALLOC
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static MALLOC_DEFINE(M_NETGRAPH_PATH, "netgraph_path", "netgraph path info");
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static MALLOC_DEFINE(M_NETGRAPH_SOCK, "netgraph_sock", "netgraph socket info");
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#else
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#define M_NETGRAPH_PATH M_NETGRAPH
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#define M_NETGRAPH_SOCK M_NETGRAPH
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#endif
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/*
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* It's Ascii-art time!
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* +-------------+ +-------------+
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* |socket (ctl)| |socket (data)|
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* +-------------+ +-------------+
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* ^ ^
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* | |
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* v v
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* +-----------+ +-----------+
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* |pcb (ctl)| |pcb (data)|
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* +-----------+ +-----------+
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* ^ ^
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* | |
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* v v
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* +--------------------------+
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* | Socket type private |
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* | data |
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* +--------------------------+
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* ^
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* |
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* v
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* +----------------+
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* | struct ng_node |
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* +----------------+
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*/
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/* Netgraph node methods */
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static ng_constructor_t ngs_constructor;
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static ng_rcvmsg_t ngs_rcvmsg;
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static ng_shutdown_t ngs_shutdown;
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static ng_newhook_t ngs_newhook;
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static ng_connect_t ngs_connect;
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static ng_findhook_t ngs_findhook;
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static ng_rcvdata_t ngs_rcvdata;
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static ng_disconnect_t ngs_disconnect;
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/* Internal methods */
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static int ng_attach_data(struct socket *so);
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static int ng_attach_cntl(struct socket *so);
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static int ng_attach_common(struct socket *so, int type);
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static void ng_detach_common(struct ngpcb *pcbp, int type);
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static void ng_socket_free_priv(struct ngsock *priv);
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static int ng_connect_data(struct sockaddr *nam, struct ngpcb *pcbp);
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static int ng_bind(struct sockaddr *nam, struct ngpcb *pcbp);
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static int ngs_mod_event(module_t mod, int event, void *data);
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static void ng_socket_item_applied(void *context, int error);
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/* Netgraph type descriptor */
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static struct ng_type typestruct = {
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.version = NG_ABI_VERSION,
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.name = NG_SOCKET_NODE_TYPE,
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.mod_event = ngs_mod_event,
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.constructor = ngs_constructor,
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.rcvmsg = ngs_rcvmsg,
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.shutdown = ngs_shutdown,
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.newhook = ngs_newhook,
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.connect = ngs_connect,
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.findhook = ngs_findhook,
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.rcvdata = ngs_rcvdata,
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.disconnect = ngs_disconnect,
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};
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NETGRAPH_INIT_ORDERED(socket, &typestruct, SI_SUB_PROTO_DOMAIN, SI_ORDER_ANY);
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/* Buffer space */
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static u_long ngpdg_sendspace = 20 * 1024; /* really max datagram size */
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SYSCTL_ULONG(_net_graph, OID_AUTO, maxdgram, CTLFLAG_RW,
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&ngpdg_sendspace , 0, "Maximum outgoing Netgraph datagram size");
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static u_long ngpdg_recvspace = 20 * 1024;
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SYSCTL_ULONG(_net_graph, OID_AUTO, recvspace, CTLFLAG_RW,
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&ngpdg_recvspace , 0, "Maximum space for incoming Netgraph datagrams");
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/* List of all sockets (for netstat -f netgraph) */
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static LIST_HEAD(, ngpcb) ngsocklist;
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static struct mtx ngsocketlist_mtx;
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#define sotongpcb(so) ((struct ngpcb *)(so)->so_pcb)
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/* If getting unexplained errors returned, set this to "kdb_enter("X"); */
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#ifndef TRAP_ERROR
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#define TRAP_ERROR
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#endif
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struct hookpriv {
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LIST_ENTRY(hookpriv) next;
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hook_p hook;
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};
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LIST_HEAD(ngshash, hookpriv);
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/* Per-node private data */
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struct ngsock {
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struct ng_node *node; /* the associated netgraph node */
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struct ngpcb *datasock; /* optional data socket */
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struct ngpcb *ctlsock; /* optional control socket */
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struct ngshash *hash; /* hash for hook names */
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u_long hmask; /* hash mask */
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int flags;
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int refs;
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struct mtx mtx; /* mtx to wait on */
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int error; /* place to store error */
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};
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#define NGS_FLAG_NOLINGER 1 /* close with last hook */
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/***************************************************************
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Control sockets
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***************************************************************/
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static int
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ngc_attach(struct socket *so, int proto, struct thread *td)
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{
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struct ngpcb *const pcbp = sotongpcb(so);
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int error;
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error = priv_check(td, PRIV_NETGRAPH_CONTROL);
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if (error)
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return (error);
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if (pcbp != NULL)
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return (EISCONN);
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return (ng_attach_cntl(so));
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}
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static void
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ngc_detach(struct socket *so)
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{
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struct ngpcb *const pcbp = sotongpcb(so);
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KASSERT(pcbp != NULL, ("ngc_detach: pcbp == NULL"));
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ng_detach_common(pcbp, NG_CONTROL);
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}
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static int
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ngc_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
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struct mbuf *control, struct thread *td)
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{
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struct ngpcb *const pcbp = sotongpcb(so);
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struct ngsock *const priv = NG_NODE_PRIVATE(pcbp->sockdata->node);
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struct sockaddr_ng *const sap = (struct sockaddr_ng *) addr;
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struct ng_mesg *msg;
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struct mbuf *m0;
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item_p item;
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char *path = NULL;
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int len, error = 0;
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struct ng_apply_info apply;
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if (control) {
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error = EINVAL;
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goto release;
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}
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/* Require destination as there may be >= 1 hooks on this node. */
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if (addr == NULL) {
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error = EDESTADDRREQ;
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goto release;
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}
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/*
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* Allocate an expendable buffer for the path, chop off
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* the sockaddr header, and make sure it's NUL terminated.
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*/
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len = sap->sg_len - 2;
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path = malloc(len + 1, M_NETGRAPH_PATH, M_WAITOK);
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bcopy(sap->sg_data, path, len);
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path[len] = '\0';
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/*
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* Move the actual message out of mbufs into a linear buffer.
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* Start by adding up the size of the data. (could use mh_len?)
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*/
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for (len = 0, m0 = m; m0 != NULL; m0 = m0->m_next)
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len += m0->m_len;
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/*
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* Move the data into a linear buffer as well.
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* Messages are not delivered in mbufs.
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*/
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msg = malloc(len + 1, M_NETGRAPH_MSG, M_WAITOK);
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m_copydata(m, 0, len, (char *)msg);
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if (msg->header.version != NG_VERSION) {
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free(msg, M_NETGRAPH_MSG);
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error = EINVAL;
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goto release;
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}
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/*
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* Hack alert!
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* We look into the message and if it mkpeers a node of unknown type, we
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* try to load it. We need to do this now, in syscall thread, because if
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* message gets queued and applied later we will get panic.
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*/
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if (msg->header.typecookie == NGM_GENERIC_COOKIE &&
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msg->header.cmd == NGM_MKPEER) {
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struct ngm_mkpeer *const mkp = (struct ngm_mkpeer *) msg->data;
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if (ng_findtype(mkp->type) == NULL) {
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char filename[NG_TYPESIZ + 3];
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int fileid;
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/* Not found, try to load it as a loadable module. */
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snprintf(filename, sizeof(filename), "ng_%s",
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mkp->type);
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error = kern_kldload(curthread, filename, &fileid);
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if (error != 0) {
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free(msg, M_NETGRAPH_MSG);
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goto release;
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}
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/* See if type has been loaded successfully. */
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if (ng_findtype(mkp->type) == NULL) {
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free(msg, M_NETGRAPH_MSG);
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(void)kern_kldunload(curthread, fileid,
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LINKER_UNLOAD_NORMAL);
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error = ENXIO;
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goto release;
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}
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}
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}
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item = ng_package_msg(msg, M_WAITOK);
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if ((error = ng_address_path((pcbp->sockdata->node), item, path, 0))
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!= 0) {
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#ifdef TRACE_MESSAGES
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printf("ng_address_path: errx=%d\n", error);
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#endif
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goto release;
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}
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#ifdef TRACE_MESSAGES
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printf("[%x]:<---------[socket]: c=<%d>cmd=%x(%s) f=%x #%d (%s)\n",
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item->el_dest->nd_ID,
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msg->header.typecookie,
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msg->header.cmd,
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msg->header.cmdstr,
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msg->header.flags,
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msg->header.token,
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item->el_dest->nd_type->name);
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#endif
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SAVE_LINE(item);
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/*
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* We do not want to return from syscall until the item
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* is processed by destination node. We register callback
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* on the item, which will update priv->error when item
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* was applied.
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* If ng_snd_item() has queued item, we sleep until
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* callback wakes us up.
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*/
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bzero(&apply, sizeof(apply));
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apply.apply = ng_socket_item_applied;
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apply.context = priv;
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item->apply = &apply;
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priv->error = -1;
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error = ng_snd_item(item, 0);
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mtx_lock(&priv->mtx);
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if (priv->error == -1)
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msleep(priv, &priv->mtx, 0, "ngsock", 0);
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mtx_unlock(&priv->mtx);
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KASSERT(priv->error != -1,
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("ng_socket: priv->error wasn't updated"));
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error = priv->error;
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release:
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if (path != NULL)
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free(path, M_NETGRAPH_PATH);
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if (control != NULL)
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m_freem(control);
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if (m != NULL)
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m_freem(m);
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return (error);
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}
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static int
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ngc_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
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{
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struct ngpcb *const pcbp = sotongpcb(so);
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if (pcbp == 0)
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return (EINVAL);
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return (ng_bind(nam, pcbp));
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}
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static int
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ngc_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
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{
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/*
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* At this time refuse to do this.. it used to
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* do something but it was undocumented and not used.
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*/
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printf("program tried to connect control socket to remote node\n");
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return (EINVAL);
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}
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/***************************************************************
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Data sockets
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***************************************************************/
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static int
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ngd_attach(struct socket *so, int proto, struct thread *td)
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{
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struct ngpcb *const pcbp = sotongpcb(so);
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if (pcbp != NULL)
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return (EISCONN);
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return (ng_attach_data(so));
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}
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static void
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ngd_detach(struct socket *so)
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{
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struct ngpcb *const pcbp = sotongpcb(so);
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KASSERT(pcbp != NULL, ("ngd_detach: pcbp == NULL"));
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ng_detach_common(pcbp, NG_DATA);
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}
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static int
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ngd_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
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struct mbuf *control, struct thread *td)
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{
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struct ngpcb *const pcbp = sotongpcb(so);
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struct sockaddr_ng *const sap = (struct sockaddr_ng *) addr;
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int len, error;
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hook_p hook = NULL;
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char hookname[NG_HOOKSIZ];
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|
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if ((pcbp == NULL) || (control != NULL)) {
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error = EINVAL;
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goto release;
|
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}
|
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if (pcbp->sockdata == NULL) {
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error = ENOTCONN;
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goto release;
|
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}
|
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|
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if (sap == NULL)
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len = 0; /* Make compiler happy. */
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else
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len = sap->sg_len - 2;
|
|
|
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/*
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* If the user used any of these ways to not specify an address
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* then handle specially.
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*/
|
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if ((sap == NULL) || (len <= 0) || (*sap->sg_data == '\0')) {
|
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if (NG_NODE_NUMHOOKS(pcbp->sockdata->node) != 1) {
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error = EDESTADDRREQ;
|
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goto release;
|
|
}
|
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/*
|
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* If exactly one hook exists, just use it.
|
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* Special case to allow write(2) to work on an ng_socket.
|
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*/
|
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hook = LIST_FIRST(&pcbp->sockdata->node->nd_hooks);
|
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} else {
|
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if (len >= NG_HOOKSIZ) {
|
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error = EINVAL;
|
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goto release;
|
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}
|
|
|
|
/*
|
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* chop off the sockaddr header, and make sure it's NUL
|
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* terminated
|
|
*/
|
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bcopy(sap->sg_data, hookname, len);
|
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hookname[len] = '\0';
|
|
|
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/* Find the correct hook from 'hookname' */
|
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hook = ng_findhook(pcbp->sockdata->node, hookname);
|
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if (hook == NULL) {
|
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error = EHOSTUNREACH;
|
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goto release;
|
|
}
|
|
}
|
|
|
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/* Send data. */
|
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NG_SEND_DATA_FLAGS(error, hook, m, NG_WAITOK);
|
|
|
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release:
|
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if (control != NULL)
|
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m_freem(control);
|
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if (m != NULL)
|
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m_freem(m);
|
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return (error);
|
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}
|
|
|
|
static int
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ngd_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
|
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{
|
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struct ngpcb *const pcbp = sotongpcb(so);
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|
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if (pcbp == 0)
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return (EINVAL);
|
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return (ng_connect_data(nam, pcbp));
|
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}
|
|
|
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/*
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* Used for both data and control sockets
|
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*/
|
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static int
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ng_getsockaddr(struct socket *so, struct sockaddr **addr)
|
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{
|
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struct ngpcb *pcbp;
|
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struct sockaddr_ng *sg;
|
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int sg_len;
|
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int error = 0;
|
|
|
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pcbp = sotongpcb(so);
|
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if ((pcbp == NULL) || (pcbp->sockdata == NULL))
|
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/* XXXGL: can this still happen? */
|
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return (EINVAL);
|
|
|
|
sg_len = sizeof(struct sockaddr_ng) + NG_NODESIZ -
|
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sizeof(sg->sg_data);
|
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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) {
|
|
SOCKBUF_UNLOCK(&so->so_rcv);
|
|
TRAP_ERROR;
|
|
m_freem(m);
|
|
return (ENOBUFS);
|
|
}
|
|
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. */
|
|
if (sbappendaddr(&so->so_rcv, (struct sockaddr *)addr, m, NULL) == 0) {
|
|
m_freem(m);
|
|
TRAP_ERROR;
|
|
return (ENOBUFS);
|
|
}
|
|
sorwakeup(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);
|
|
}
|
|
/*
|
|
* Control and data socket type descriptors
|
|
*
|
|
* XXXRW: Perhaps _close should do something?
|
|
*/
|
|
|
|
static struct pr_usrreqs ngc_usrreqs = {
|
|
.pru_abort = NULL,
|
|
.pru_attach = ngc_attach,
|
|
.pru_bind = ngc_bind,
|
|
.pru_connect = ngc_connect,
|
|
.pru_detach = ngc_detach,
|
|
.pru_disconnect = dummy_disconnect,
|
|
.pru_peeraddr = NULL,
|
|
.pru_send = ngc_send,
|
|
.pru_shutdown = NULL,
|
|
.pru_sockaddr = ng_getsockaddr,
|
|
.pru_close = NULL,
|
|
};
|
|
|
|
static struct pr_usrreqs ngd_usrreqs = {
|
|
.pru_abort = NULL,
|
|
.pru_attach = ngd_attach,
|
|
.pru_bind = NULL,
|
|
.pru_connect = ngd_connect,
|
|
.pru_detach = ngd_detach,
|
|
.pru_disconnect = dummy_disconnect,
|
|
.pru_peeraddr = NULL,
|
|
.pru_send = ngd_send,
|
|
.pru_shutdown = NULL,
|
|
.pru_sockaddr = ng_getsockaddr,
|
|
.pru_close = NULL,
|
|
};
|
|
|
|
/*
|
|
* Definitions of protocols supported in the NETGRAPH domain.
|
|
*/
|
|
|
|
extern struct domain ngdomain; /* stop compiler warnings */
|
|
|
|
static struct protosw ngsw[] = {
|
|
{
|
|
.pr_type = SOCK_DGRAM,
|
|
.pr_domain = &ngdomain,
|
|
.pr_protocol = NG_CONTROL,
|
|
.pr_flags = PR_ATOMIC | PR_ADDR /* | PR_RIGHTS */,
|
|
.pr_usrreqs = &ngc_usrreqs
|
|
},
|
|
{
|
|
.pr_type = SOCK_DGRAM,
|
|
.pr_domain = &ngdomain,
|
|
.pr_protocol = NG_DATA,
|
|
.pr_flags = PR_ATOMIC | PR_ADDR,
|
|
.pr_usrreqs = &ngd_usrreqs
|
|
}
|
|
};
|
|
|
|
struct domain ngdomain = {
|
|
.dom_family = AF_NETGRAPH,
|
|
.dom_name = "netgraph",
|
|
.dom_protosw = ngsw,
|
|
.dom_protoswNPROTOSW = &ngsw[sizeof(ngsw) / sizeof(ngsw[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:
|
|
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);
|
|
}
|
|
|
|
VNET_DOMAIN_SET(ng);
|
|
|
|
SYSCTL_INT(_net_graph, OID_AUTO, family, CTLFLAG_RD, 0, AF_NETGRAPH, "");
|
|
static SYSCTL_NODE(_net_graph, OID_AUTO, data, CTLFLAG_RW, 0, "DATA");
|
|
SYSCTL_INT(_net_graph_data, OID_AUTO, proto, CTLFLAG_RD, 0, NG_DATA, "");
|
|
static SYSCTL_NODE(_net_graph, OID_AUTO, control, CTLFLAG_RW, 0, "CONTROL");
|
|
SYSCTL_INT(_net_graph_control, OID_AUTO, proto, CTLFLAG_RD, 0, NG_CONTROL, "");
|
|
|