diff options
Diffstat (limited to 'sys/netgraph/ng_socket.c')
| -rw-r--r-- | sys/netgraph/ng_socket.c | 957 |
1 files changed, 957 insertions, 0 deletions
diff --git a/sys/netgraph/ng_socket.c b/sys/netgraph/ng_socket.c new file mode 100644 index 0000000..b8ba80b --- /dev/null +++ b/sys/netgraph/ng_socket.c @@ -0,0 +1,957 @@ + +/* + * ng_socket.c + * + * Copyright (c) 1996-1999 Whistle Communications, Inc. + * All rights reserved. + * + * Subject to the following obligations and disclaimer of warranty, use and + * redistribution of this software, in source or object code forms, with or + * without modifications are expressly permitted by Whistle Communications; + * provided, however, that: + * 1. Any and all reproductions of the source or object code must include the + * copyright notice above and the following disclaimer of warranties; and + * 2. No rights are granted, in any manner or form, to use Whistle + * Communications, Inc. trademarks, including the mark "WHISTLE + * COMMUNICATIONS" on advertising, endorsements, or otherwise except as + * such appears in the above copyright notice or in the software. + * + * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND + * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO + * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, + * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. + * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY + * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS + * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE. + * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES + * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING + * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, + * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR + * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY + * OF SUCH DAMAGE. + * + * Author: Julian Elischer <julian@whistle.com> + * + * $FreeBSD$ + * $Whistle: ng_socket.c,v 1.25 1999/01/28 23:54:54 julian Exp $ + */ + +/* + * Netgraph socket nodes + * + * There are two types of netgraph sockets, control and data. + * Control sockets have a netgraph node, but data sockets are + * parasitic on control sockets, and have no node of their own. + */ + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/proc.h> +#include <sys/domain.h> +#include <sys/errno.h> +#include <sys/kernel.h> +#include <sys/file.h> +#include <sys/filedesc.h> +#include <sys/malloc.h> +#include <sys/queue.h> +#include <sys/mbuf.h> +#include <sys/protosw.h> +#include <sys/socket.h> +#include <sys/socketvar.h> +#include <sys/sysctl.h> +#ifdef NOTYET +#include <sys/vnode.h> +#endif +#include <netgraph/ng_message.h> +#include <netgraph/netgraph.h> +#include <netgraph/ng_socket.h> +#include <netgraph/ng_socketvar.h> + +/* + * It's Ascii-art time! + * +-------------+ +-------------+ + * |socket (ctl)| |socket (data)| + * +-------------+ +-------------+ + * ^ ^ + * | | + * v v + * +-----------+ +-----------+ + * |pcb (ctl)| |pcb (data)| + * +-----------+ +-----------+ + * ^ ^ + * | | + * v v + * +--------------------------+ + * | Socket type private | + * | data | + * +--------------------------+ + * ^ + * | + * v + * +----------------+ + * | struct ng_node | + * +----------------+ + */ + +/* Netgraph node methods */ +static int ngs_constructor(node_p *nodep); +static int ngs_rcvmsg(node_p node, struct ng_mesg *msg, + const char *retaddr, struct ng_mesg **resp); +static int ngs_rmnode(node_p node); +static int ngs_newhook(node_p node, hook_p hook, const char *name); +static int ngs_rcvdata(hook_p hook, struct mbuf *m, meta_p meta); + +/* Internal methods */ +static int ng_attach_data(struct socket *so); +static int ng_attach_cntl(struct socket *so); +static int ng_attach_common(struct socket *so, int type); +static void ng_detach_common(struct ngpcb *pcbp, int type); +/*static int ng_internalize(struct mbuf *m, struct proc *p); */ + +static int ng_connect_data(struct sockaddr *nam, struct ngpcb *pcbp); +static int ng_connect_cntl(struct sockaddr *nam, struct ngpcb *pcbp); +static int ng_bind(struct sockaddr *nam, struct ngpcb *pcbp); + +static int ngs_mod_event(module_t mod, int event, void *data); +static int ship_msg(struct ngpcb *pcbp, struct ng_mesg *msg, + struct sockaddr_ng *addr); + +/* Netgraph type descriptor */ +static struct ng_type typestruct = { + NG_VERSION, + NG_SOCKET_NODE_TYPE, + ngs_mod_event, + ngs_constructor, + ngs_rcvmsg, + ngs_rmnode, + ngs_newhook, + NULL, + NULL, + ngs_rcvdata, + ngs_rcvdata, + NULL, +}; +NETGRAPH_INIT(socket, &typestruct); + +/* Buffer space */ +static u_long ngpdg_sendspace = 2 * 1024; /* really max datagram size */ +static u_long ngpdg_recvspace = 20 * 1024; + +/* List of all sockets */ +LIST_HEAD(, ngpcb) ngsocklist; + +#define sotongpcb(so) ((struct ngpcb *)so->so_pcb) + +/* If getting unexplained errors returned, set this to "Debugger("X"); */ +#ifndef TRAP_ERROR +#define TRAP_ERROR +#endif + +/*************************************************************** + Control sockets +***************************************************************/ + +static int +ngc_attach(struct socket *so, int proto, struct proc *p) +{ + struct ngpcb *const pcbp = sotongpcb(so); + + if (pcbp != NULL) + return (EISCONN); + return (ng_attach_cntl(so)); +} + +static int +ngc_detach(struct socket *so) +{ + struct ngpcb *const pcbp = sotongpcb(so); + + if (pcbp == NULL) + return (EINVAL); + ng_detach_common(pcbp, NG_CONTROL); + return (0); +} + +static int +ngc_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, + struct mbuf *control, struct proc *p) +{ + struct ngpcb *const pcbp = sotongpcb(so); + struct sockaddr_ng *const sap = (struct sockaddr_ng *) addr; + struct ng_mesg *resp; + struct mbuf *m0; + char *msg, *path = NULL; + int len, error = 0; + + if (pcbp == NULL) { + error = EINVAL; + goto release; + } +#ifdef NOTYET + if (control && (error = ng_internalize(control, p))) { + if (pcbp->sockdata == NULL) { + error = ENOTCONN; + goto release; + } + } +#else /* NOTYET */ + if (control) { + error = EINVAL; + goto release; + } +#endif /* NOTYET */ + + /* Require destination as there may be >= 1 hooks on this node */ + if (addr == NULL) { + error = EDESTADDRREQ; + goto release; + } + + /* Allocate an expendable buffer for the path, chop off + * the sockaddr header, and make sure it's NUL terminated */ + len = sap->sg_len - 2; + MALLOC(path, char *, len + 1, M_NETGRAPH, M_WAITOK); + if (path == NULL) { + error = ENOMEM; + goto release; + } + bcopy(sap->sg_data, path, len); + path[len] = '\0'; + + /* Move the actual message out of mbufs into a linear buffer. + * Start by adding up the size of the data. (could use mh_len?) */ + for (len = 0, m0 = m; m0 != NULL; m0 = m0->m_next) + len += m0->m_len; + + /* Move the data into a linear buffer as well. Messages are not + * delivered in mbufs. */ + MALLOC(msg, char *, len + 1, M_NETGRAPH, M_WAITOK); + if (msg == NULL) { + error = ENOMEM; + goto release; + } + m_copydata(m, 0, len, msg); + + /* The callee will free the msg when done. The addr is our business. */ + error = ng_send_msg(pcbp->sockdata->node, + (struct ng_mesg *) msg, path, &resp); + + /* If the callee responded with a synchronous response, then put it + * back on the receive side of the socket; sap is source address. */ + if (error == 0 && resp != NULL) + error = ship_msg(pcbp, resp, sap); + +release: + if (path != NULL) + FREE(path, M_NETGRAPH); + if (control != NULL) + m_freem(control); + if (m != NULL) + m_freem(m); + return (error); +} + +static int +ngc_bind(struct socket *so, struct sockaddr *nam, struct proc *p) +{ + struct ngpcb *const pcbp = sotongpcb(so); + + if (pcbp == 0) + return (EINVAL); + return (ng_bind(nam, pcbp)); +} + +static int +ngc_connect(struct socket *so, struct sockaddr *nam, struct proc *p) +{ + struct ngpcb *const pcbp = sotongpcb(so); + + if (pcbp == 0) + return (EINVAL); + return (ng_connect_cntl(nam, pcbp)); +} + +/*************************************************************** + Data sockets +***************************************************************/ + +static int +ngd_attach(struct socket *so, int proto, struct proc *p) +{ + struct ngpcb *const pcbp = sotongpcb(so); + + if (pcbp != NULL) + return (EISCONN); + return (ng_attach_data(so)); +} + +static int +ngd_detach(struct socket *so) +{ + struct ngpcb *const pcbp = sotongpcb(so); + + if (pcbp == NULL) + return (EINVAL); + ng_detach_common(pcbp, NG_DATA); + return (0); +} + +static int +ngd_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, + struct mbuf *control, struct proc *p) +{ + struct ngpcb *const pcbp = sotongpcb(so); + struct sockaddr_ng *const sap = (struct sockaddr_ng *) addr; + char *hookname = NULL; + meta_p mp = NULL; + int len, error; + hook_p hook; + + if ((pcbp == NULL) || (control != NULL)) { + error = EINVAL; + goto release; + } + if (pcbp->sockdata == NULL) { + error = ENOTCONN; + goto release; + } + if (addr == NULL) { + error = EDESTADDRREQ; + goto release; + } + + /* Allocate an expendable buffer for the hook name, chop off + * the sockaddr header, and make sure it's NUL terminated */ + len = sap->sg_len - 2; + MALLOC(hookname, char *, len + 1, M_NETGRAPH, M_WAITOK); + if (hookname == NULL) { + error = ENOMEM; + goto release; + } + bcopy(sap->sg_data, hookname, len); + hookname[len] = '\0'; + + /* Find the correct hook from 'hookname' */ + LIST_FOREACH(hook, &pcbp->sockdata->node->hooks, hooks) { + if (strcmp(hookname, hook->name) == 0) + break; + } + + /* Send data (OK if hook is NULL) */ + NG_SEND_DATA(error, hook, m, mp); /* makes m NULL */ + +release: + if (hookname != NULL) + FREE(hookname, M_NETGRAPH); + if (control != NULL) + m_freem(control); + if (m != NULL) + m_freem(m); + return (error); +} + +static int +ngd_connect(struct socket *so, struct sockaddr *nam, struct proc *p) +{ + struct ngpcb *const pcbp = sotongpcb(so); + + if (pcbp == 0) + return (EINVAL); + return (ng_connect_data(nam, pcbp)); +} + +/* + * Used for both data and control sockets + */ +static int +ng_setsockaddr(struct socket *so, struct sockaddr **addr) +{ + struct ngpcb *const pcbp = sotongpcb(so); + struct sockaddr *sa; + int namelen; + + if (pcbp == 0) + return (EINVAL); + if (pcbp->sockdata->node->name != NULL) { + namelen = strlen(pcbp->sockdata->node->name) + 3; + MALLOC(sa, struct sockaddr *, namelen, M_SONAME, M_WAITOK); + if (sa == NULL) + return (ENOMEM); + sa->sa_family = AF_NETGRAPH; + sa->sa_len = namelen; + strcpy(sa->sa_data, pcbp->sockdata->node->name); + *addr = sa; + } else + *addr = NULL; /* XXX check this makes sense */ + return (0); +} + +/* + * Attach a socket to it's protocol specific partner. + * For a control socket, actually create a netgraph node and attach + * to it as well. + */ + +static int +ng_attach_cntl(struct socket *so) +{ + struct ngsock *privdata; + struct ngpcb *pcbp; + int error; + + /* Setup protocol control block */ + if ((error = ng_attach_common(so, NG_CONTROL)) != 0) + return (error); + pcbp = (struct ngpcb *) so->so_pcb; + + /* Allocate node private info */ + MALLOC(privdata, struct ngsock *, + sizeof(*privdata), M_NETGRAPH, M_WAITOK); + if (privdata == NULL) { + ng_detach_common(pcbp, NG_CONTROL); + return (ENOMEM); + } + bzero(privdata, sizeof(*privdata)); + + /* Make the generic node components */ + if ((error = ng_make_node_common(&typestruct, &privdata->node)) != 0) { + FREE(privdata, M_NETGRAPH); + ng_detach_common(pcbp, NG_CONTROL); + return (error); + } + privdata->node->private = privdata; + + /* Link the pcb and the node private data */ + privdata->ctlsock = pcbp; + pcbp->sockdata = privdata; + privdata->refs++; + return (0); +} + +static int +ng_attach_data(struct socket *so) +{ + return(ng_attach_common(so, NG_DATA)); +} + +/* + * Set up a socket protocol control block. + * This code is shared between control and data sockets. + */ +static int +ng_attach_common(struct socket *so, int type) +{ + struct ngpcb *pcbp; + int error; + + /* Standard socket setup stuff */ + error = soreserve(so, ngpdg_sendspace, ngpdg_recvspace); + if (error) + return (error); + + /* Allocate the pcb */ + MALLOC(pcbp, struct ngpcb *, sizeof(*pcbp), M_PCB, M_WAITOK); + if (pcbp == NULL) + return (ENOMEM); + bzero(pcbp, sizeof(*pcbp)); + pcbp->type = type; + + /* Link the pcb and the socket */ + so->so_pcb = (caddr_t) pcbp; + pcbp->ng_socket = so; + + /* Add the socket to linked list */ + LIST_INSERT_HEAD(&ngsocklist, pcbp, socks); + return (0); +} + +/* + * Disassociate the socket from it's protocol specific + * partner. If it's attached to a node's private data structure, + * then unlink from that too. If we were the last socket attached to it, + * then shut down the entire node. Shared code for control and data sockets. + */ +static void +ng_detach_common(struct ngpcb *pcbp, int which) +{ + struct ngsock *sockdata; + + if (pcbp->sockdata) { + sockdata = pcbp->sockdata; + pcbp->sockdata = NULL; + switch (which) { + case NG_CONTROL: + sockdata->ctlsock = NULL; + break; + case NG_DATA: + sockdata->datasock = NULL; + break; + default: + panic(__FUNCTION__); + } + if ((--sockdata->refs == 0) && (sockdata->node != NULL)) + ng_rmnode(sockdata->node); + } + pcbp->ng_socket->so_pcb = NULL; + pcbp->ng_socket = NULL; + LIST_REMOVE(pcbp, socks); + FREE(pcbp, M_PCB); +} + +#ifdef NOTYET +/* + * File descriptors can be passed into a AF_NETGRAPH socket. + * Note, that file descriptors cannot be passed OUT. + * Only character device descriptors are accepted. + * Character devices are useful to connect a graph to a device, + * which after all is the purpose of this whole system. + */ +static int +ng_internalize(struct mbuf *control, struct proc *p) +{ + struct filedesc *fdp = p->p_fd; + struct cmsghdr *cm = mtod(control, struct cmsghdr *); + struct file *fp; + struct vnode *vn; + int oldfds; + int fd; + + if (cm->cmsg_type != SCM_RIGHTS || cm->cmsg_level != SOL_SOCKET || + cm->cmsg_len != control->m_len) { + TRAP_ERROR; + return (EINVAL); + } + + /* Check there is only one FD. XXX what would more than one signify? */ + oldfds = (cm->cmsg_len - sizeof(*cm)) / sizeof(int); + if (oldfds != 1) { + TRAP_ERROR; + return (EINVAL); + } + + /* Check that the FD given is legit. and change it to a pointer to a + * struct file. */ + fd = *(int *) (cm + 1); + if ((unsigned) fd >= fdp->fd_nfiles + || (fp = fdp->fd_ofiles[fd]) == NULL) { + return (EBADF); + } + + /* Depending on what kind of resource it is, act differently. For + * devices, we treat it as a file. For a AF_NETGRAPH socket, + * shortcut straight to the node. */ + switch (fp->f_type) { + case DTYPE_VNODE: + vn = (struct vnode *) fp->f_data; + if (vn && (vn->v_type == VCHR)) { + /* for a VCHR, actually reference the FILE */ + fp->f_count++; + /* XXX then what :) */ + /* how to pass on to other modules? */ + } else { + TRAP_ERROR; + return (EINVAL); + } + break; + default: + TRAP_ERROR; + return (EINVAL); + } + return (0); +} +#endif /* NOTYET */ + +/* + * Connect the data socket to a named control socket node. + */ +static int +ng_connect_data(struct sockaddr *nam, struct ngpcb *pcbp) +{ + struct sockaddr_ng *sap; + node_p farnode; + struct ngsock *sockdata; + int error; + + /* If we are already connected, don't do it again */ + if (pcbp->sockdata != NULL) + return (EISCONN); + + /* Find the target (victim) and check it doesn't already have a data + * socket. Also check it is a 'socket' type node. */ + sap = (struct sockaddr_ng *) nam; + if ((error = ng_path2node(NULL, sap->sg_data, &farnode, NULL))) + return (error); + + if (strcmp(farnode->type->name, NG_SOCKET_NODE_TYPE) != 0) + return (EINVAL); + sockdata = farnode->private; + if (sockdata->datasock != NULL) + return (EADDRINUSE); + + /* Link the PCB and the private data struct. and note the extra + * reference */ + sockdata->datasock = pcbp; + pcbp->sockdata = sockdata; + sockdata->refs++; + return (0); +} + +/* + * Connect the existing control socket node to a named node:hook. + * The hook we use on this end is the same name as the remote node name. + */ +static int +ng_connect_cntl(struct sockaddr *nam, struct ngpcb *pcbp) +{ + struct ngsock *const sockdata = pcbp->sockdata; + struct sockaddr_ng *sap; + char *node, *hook; + node_p farnode; + int rtn, error; + + sap = (struct sockaddr_ng *) nam; + rtn = ng_path_parse(sap->sg_data, &node, NULL, &hook); + if (rtn < 0 || node == NULL || hook == NULL) { + TRAP_ERROR; + return (EINVAL); + } + farnode = ng_findname(sockdata->node, node); + if (farnode == NULL) { + TRAP_ERROR; + return (EADDRNOTAVAIL); + } + + /* Connect, using a hook name the same as the far node name. */ + error = ng_con_nodes(sockdata->node, node, farnode, hook); + return error; +} + +/* + * Binding a socket means giving the corresponding node a name + */ +static int +ng_bind(struct sockaddr *nam, struct ngpcb *pcbp) +{ + struct ngsock *const sockdata = pcbp->sockdata; + struct sockaddr_ng *const sap = (struct sockaddr_ng *) nam; + + if (sockdata == NULL) { + TRAP_ERROR; + return (EINVAL); + } + if (sap->sg_len < 3 || sap->sg_data[sap->sg_len - 3] != '\0') { + TRAP_ERROR; + return (EINVAL); + } + return (ng_name_node(sockdata->node, sap->sg_data)); +} + +/* + * Take a message and pass it up to the control socket associated + * with the node. + */ +static int +ship_msg(struct ngpcb *pcbp, struct ng_mesg *msg, struct sockaddr_ng *addr) +{ + struct socket *const so = pcbp->ng_socket; + struct mbuf *mdata; + int msglen; + + /* Copy the message itself into an mbuf chain */ + msglen = sizeof(struct ng_mesg) + msg->header.arglen; + mdata = m_devget((caddr_t) msg, msglen, 0, NULL, NULL); + + /* Here we free the message, as we are the end of the line. + * We need to do that regardless of whether we got mbufs. */ + FREE(msg, M_NETGRAPH); + + if (mdata == NULL) { + TRAP_ERROR; + return (ENOBUFS); + } + + /* Send it up to the socket */ + if (sbappendaddr(&so->so_rcv, + (struct sockaddr *) addr, mdata, NULL) == 0) { + TRAP_ERROR; + m_freem(mdata); + return (ENOBUFS); + } + sorwakeup(so); + return (0); +} + +/* + * You can only create new nodes from the socket end of things. + */ +static int +ngs_constructor(node_p *nodep) +{ + return (EINVAL); +} + +/* + * We allow any hook to be connected to the node. + * There is no per-hook private information though. + */ +static int +ngs_newhook(node_p node, hook_p hook, const char *name) +{ + hook->private = node->private; + return (0); +} + +/* + * Incoming messages get passed up to the control socket. + */ +static int +ngs_rcvmsg(node_p node, struct ng_mesg *msg, const char *retaddr, + struct ng_mesg **resp) +{ + struct ngsock *const sockdata = node->private; + struct ngpcb *const pcbp = sockdata->ctlsock; + struct sockaddr_ng *addr; + int addrlen; + int error = 0; + + /* Only allow mesgs to be passed if we have the control socket. + * Data sockets can only support the generic messages. */ + if (pcbp == NULL) { + TRAP_ERROR; + return (EINVAL); + } + + /* Get the return address into a sockaddr */ + if ((retaddr == NULL) || (*retaddr == '\0')) + retaddr = ""; + addrlen = strlen(retaddr); + MALLOC(addr, struct sockaddr_ng *, addrlen + 4, M_NETGRAPH, M_NOWAIT); + if (addr == NULL) { + TRAP_ERROR; + return (ENOMEM); + } + addr->sg_len = addrlen + 3; + addr->sg_family = AF_NETGRAPH; + bcopy(retaddr, addr->sg_data, addrlen); + addr->sg_data[addrlen] = '\0'; + + /* Send it up */ + error = ship_msg(pcbp, msg, addr); + FREE(addr, M_NETGRAPH); + return (error); +} + +/* + * Receive data on a hook + */ +static int +ngs_rcvdata(hook_p hook, struct mbuf *m, meta_p meta) +{ + struct ngsock *const sockdata = hook->node->private; + struct ngpcb *const pcbp = sockdata->datasock; + struct socket *so; + struct sockaddr_ng *addr; + char *addrbuf[NG_HOOKLEN + 1 + 4]; + int addrlen; + + /* If there is no data socket, black-hole it */ + if (pcbp == NULL) { + NG_FREE_DATA(m, meta); + return (0); + } + so = pcbp->ng_socket; + + /* Get the return address into a sockaddr. */ + addrlen = strlen(hook->name); /* <= NG_HOOKLEN */ + addr = (struct sockaddr_ng *) addrbuf; + addr->sg_len = addrlen + 3; + addr->sg_family = AF_NETGRAPH; + bcopy(hook->name, addr->sg_data, addrlen); + addr->sg_data[addrlen] = '\0'; + + /* We have no use for the meta data, free/clear it now. */ + NG_FREE_META(meta); + + /* Try to tell the socket which hook it came in on */ + if (sbappendaddr(&so->so_rcv, (struct sockaddr *) addr, m, NULL) == 0) { + m_freem(m); + TRAP_ERROR; + return (ENOBUFS); + } + sorwakeup(so); + return (0); +} + +/* + * Do local shutdown processing. + * In this case, that involves making sure the socket + * knows we should be shutting down. + */ +static int +ngs_rmnode(node_p node) +{ + struct ngsock *const sockdata = node->private; + struct ngpcb *const dpcbp = sockdata->datasock; + struct ngpcb *const pcbp = sockdata->ctlsock; + + ng_cutlinks(node); + ng_unname(node); + + if (dpcbp != NULL) { + soisdisconnected(dpcbp->ng_socket); + dpcbp->sockdata = NULL; + sockdata->datasock = NULL; + sockdata->refs--; + } + if (pcbp != NULL) { + soisdisconnected(pcbp->ng_socket); + pcbp->sockdata = NULL; + sockdata->ctlsock = NULL; + sockdata->refs--; + } + node->private = NULL; + ng_unref(node); + FREE(sockdata, M_NETGRAPH); + return (0); +} + +/* + * Control and data socket type descriptors + */ + +static struct pr_usrreqs ngc_usrreqs = { + NULL, /* abort */ + pru_accept_notsupp, + ngc_attach, + ngc_bind, + ngc_connect, + pru_connect2_notsupp, + pru_control_notsupp, + ngc_detach, + NULL, /* disconnect */ + pru_listen_notsupp, + NULL, /* setpeeraddr */ + pru_rcvd_notsupp, + pru_rcvoob_notsupp, + ngc_send, + pru_sense_null, + NULL, /* shutdown */ + ng_setsockaddr, + sosend, + soreceive, + sopoll +}; + +static struct pr_usrreqs ngd_usrreqs = { + NULL, /* abort */ + pru_accept_notsupp, + ngd_attach, + NULL, /* bind */ + ngd_connect, + pru_connect2_notsupp, + pru_control_notsupp, + ngd_detach, + NULL, /* disconnect */ + pru_listen_notsupp, + NULL, /* setpeeraddr */ + pru_rcvd_notsupp, + pru_rcvoob_notsupp, + ngd_send, + pru_sense_null, + NULL, /* shutdown */ + ng_setsockaddr, + sosend, + soreceive, + sopoll +}; + +/* + * Definitions of protocols supported in the NETGRAPH domain. + */ + +extern struct domain ngdomain; /* stop compiler warnings */ + +static struct protosw ngsw[] = { + { + SOCK_DGRAM, + &ngdomain, + NG_CONTROL, + PR_ATOMIC | PR_ADDR /* | PR_RIGHTS */, + 0, 0, 0, 0, + NULL, + 0, 0, 0, 0, + &ngc_usrreqs + }, + { + SOCK_DGRAM, + &ngdomain, + NG_DATA, + PR_ATOMIC | PR_ADDR, + 0, 0, 0, 0, + NULL, + 0, 0, 0, 0, + &ngd_usrreqs + } +}; + +struct domain ngdomain = { + AF_NETGRAPH, + "netgraph", + 0, + NULL, + NULL, + ngsw, + &ngsw[sizeof(ngsw) / sizeof(ngsw[0])], + 0, + NULL, + 0, + 0 +}; + +/* + * Handle loading and unloading for this node type + * This is to handle auxiliary linkages (e.g protocol domain addition). + */ +static int +ngs_mod_event(module_t mod, int event, void *data) +{ + int error = 0; + + switch (event) { + case MOD_LOAD: + /* Register protocol domain */ + net_add_domain(&ngdomain); + break; + case MOD_UNLOAD: + /* Insure there are no open netgraph sockets */ + if (!LIST_EMPTY(&ngsocklist)) { + error = EBUSY; + break; + } + +#ifdef NOTYET + /* Unregister protocol domain XXX can't do this yet.. */ + if ((error = net_rm_domain(&ngdomain)) != 0) + break; +#else + error = EBUSY; +#endif + break; + default: + error = EOPNOTSUPP; + break; + } + return (error); +} + +SYSCTL_NODE(_net, AF_NETGRAPH, graph, CTLFLAG_RW, 0, "netgraph Family"); +SYSCTL_INT(_net_graph, OID_AUTO, family, CTLFLAG_RD, 0, AF_NETGRAPH, ""); +SYSCTL_NODE(_net_graph, OID_AUTO, data, CTLFLAG_RW, 0, "DATA"); +SYSCTL_INT(_net_graph_data, OID_AUTO, proto, CTLFLAG_RD, 0, NG_DATA, ""); +SYSCTL_NODE(_net_graph, OID_AUTO, control, CTLFLAG_RW, 0, "CONTROL"); +SYSCTL_INT(_net_graph_control, OID_AUTO, proto, CTLFLAG_RD, 0, NG_CONTROL, ""); + |
