/* * 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 * * $FreeBSD$ * $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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef NOTYET #include #endif #include #include #include #include /* * 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_rmnode; static ng_newhook_t ngs_newhook; 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 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, ngs_disconnect, 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 (suser(p)) return (EPERM); 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; meta_p mp = NULL; int len, error; hook_p hook = NULL; char hookname[NG_HOOKLEN + 1]; if ((pcbp == NULL) || (control != NULL)) { error = EINVAL; goto release; } if (pcbp->sockdata == NULL) { error = ENOTCONN; goto release; } /* * If the user used any of these ways to not specify an address * then handle specially. */ if ((sap == NULL) || ((len = sap->sg_len) <= 2) || (*sap->sg_data == '\0')) { if (pcbp->sockdata->node->numhooks != 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->hooks); } else { if (len > NG_HOOKLEN) { 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' */ LIST_FOREACH(hook, &pcbp->sockdata->node->hooks, hooks) { if (strcmp(hookname, hook->name) == 0) break; } if (hook == NULL) error = EHOSTUNREACH; } /* Send data (OK if hook is NULL) */ NG_SEND_DATA(error, hook, m, mp); /* makes m NULL */ 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 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 *pcbp; struct sockaddr_ng *sg; int sg_len, namelen, s; /* Why isn't sg_data a `char[1]' ? :-( */ sg_len = sizeof(struct sockaddr_ng) - sizeof(sg->sg_data) + 1; s = splnet(); pcbp = sotongpcb(so); if (pcbp == 0) { splx(s); return (EINVAL); } namelen = 0; /* silence compiler ! */ if (pcbp->sockdata->node->name != NULL) sg_len += namelen = strlen(pcbp->sockdata->node->name); MALLOC(sg, struct sockaddr_ng *, sg_len, M_SONAME, M_WAITOK); bzero(sg, sg_len); if (pcbp->sockdata->node->name != NULL) bcopy(pcbp->sockdata->node->name, sg->sg_data, namelen); splx(s); sg->sg_len = sg_len; sg->sg_family = AF_NETGRAPH; *addr = (struct sockaddr *)sg; 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 = sotongpcb(so); /* 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. * Unless they are for us specifically (socket_type) */ 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); } if (msg->header.typecookie == NGM_SOCKET_COOKIE) { switch (msg->header.cmd) { case NGM_SOCK_CMD_NOLINGER: sockdata->flags |= NGS_FLAG_NOLINGER; break; case NGM_SOCK_CMD_LINGER: sockdata->flags &= ~NGS_FLAG_NOLINGER; break; default: error = EINVAL; /* unknown command */ } /* Free the message and return */ FREE(msg, M_NETGRAPH); return(error); } /* 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); } /* * 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) { struct ngsock *const sockdata = hook->node->private; if ((sockdata->flags & NGS_FLAG_NOLINGER ) && (hook->node->numhooks == 0)) { ng_rmnode(hook->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_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, "");