diff options
Diffstat (limited to 'sys/netgraph/ng_UI.c')
-rw-r--r-- | sys/netgraph/ng_UI.c | 242 |
1 files changed, 242 insertions, 0 deletions
diff --git a/sys/netgraph/ng_UI.c b/sys/netgraph/ng_UI.c new file mode 100644 index 0000000..7295b4a --- /dev/null +++ b/sys/netgraph/ng_UI.c @@ -0,0 +1,242 @@ + +/* + * ng_UI.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_UI.c,v 1.11 1999/01/28 23:54:52 julian Exp $ + */ + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/errno.h> +#include <sys/kernel.h> +#include <sys/malloc.h> +#include <sys/mbuf.h> +#include <sys/conf.h> +#include <sys/errno.h> +#include <sys/socket.h> +#include <sys/syslog.h> + +#include <net/if.h> +#include <netinet/in.h> +#include <netinet/if_ether.h> + +#include <netgraph/ng_message.h> +#include <netgraph/netgraph.h> +#include <netgraph/ng_UI.h> + +/* + * DEFINITIONS + */ + +/* Everything, starting with sdlc on has defined UI as 0x03 */ +#define HDLC_UI 0x03 + +/* Node private data */ +struct private { + hook_p downlink; + hook_p uplink; +}; +typedef struct private *priv_p; + +/* Netgraph node methods */ +static int ng_UI_constructor(node_p *nodep); +static int ng_UI_rcvmsg(node_p node, struct ng_mesg *msg, + const char *retaddr, struct ng_mesg **resp); +static int ng_UI_rmnode(node_p node); +static int ng_UI_newhook(node_p node, hook_p hook, const char *name); +static int ng_UI_rcvdata(hook_p hook, struct mbuf *m, meta_p meta); +static int ng_UI_disconnect(hook_p hook); + +/* Node type descriptor */ +static struct ng_type typestruct = { + NG_VERSION, + NG_UI_NODE_TYPE, + NULL, + ng_UI_constructor, + ng_UI_rcvmsg, + ng_UI_rmnode, + ng_UI_newhook, + NULL, + NULL, + ng_UI_rcvdata, + ng_UI_rcvdata, + ng_UI_disconnect +}; +NETGRAPH_INIT(UI, &typestruct); + +/************************************************************************ + NETGRAPH NODE STUFF + ************************************************************************/ + +/* + * Create a newborn node. We start with an implicit reference. + */ + +static int +ng_UI_constructor(node_p *nodep) +{ + priv_p priv; + int error; + + /* Allocate private structure */ + MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_WAITOK); + if (priv == NULL) + return (ENOMEM); + bzero(priv, sizeof(*priv)); + + /* Call generic node constructor */ + if ((error = ng_make_node_common(&typestruct, nodep))) { + FREE(priv, M_NETGRAPH); + return (error); + } + (*nodep)->private = priv; + + /* Done */ + return (0); +} + +/* + * Give our ok for a hook to be added + */ +static int +ng_UI_newhook(node_p node, hook_p hook, const char *name) +{ + const priv_p priv = node->private; + + if (!strcmp(name, NG_UI_HOOK_DOWNSTREAM)) { + if (priv->downlink) + return (EISCONN); + priv->downlink = hook; + } else if (!strcmp(name, NG_UI_HOOK_UPSTREAM)) { + if (priv->uplink) + return (EISCONN); + priv->uplink = hook; + } else + return (EINVAL); + return (0); +} + +/* + * Receive a control message + */ +static int +ng_UI_rcvmsg(node_p node, struct ng_mesg *msg, + const char *raddr, struct ng_mesg **rp) +{ + FREE(msg, M_NETGRAPH); + return (EINVAL); +} + +#define MAX_ENCAPS_HDR 1 +#define ERROUT(x) do { error = (x); goto done; } while (0) + +/* + * Receive a data frame + */ +static int +ng_UI_rcvdata(hook_p hook, struct mbuf *m, meta_p meta) +{ + const node_p node = hook->node; + const priv_p priv = node->private; + int error = 0; + + if (hook == priv->downlink) { + u_char *start, *ptr; + + if (!m || !(m = m_pullup(m, MAX_ENCAPS_HDR))) + ERROUT(ENOBUFS); + ptr = start = mtod(m, u_char *); + + /* Must be UI frame */ + if (*ptr++ != HDLC_UI) + ERROUT(0); + + m_adj(m, ptr - start); + NG_SEND_DATA(error, priv->uplink, m, meta); /* m -> NULL */ + } else if (hook == priv->uplink) { + M_PREPEND(m, 1, M_DONTWAIT); /* Prepend IP NLPID */ + if (!m) + ERROUT(ENOBUFS); + mtod(m, u_char *)[0] = HDLC_UI; + NG_SEND_DATA(error, priv->downlink, m, meta); /* m -> NULL */ + } else + panic(__FUNCTION__); + +done: + NG_FREE_DATA(m, meta); /* does nothing if m == NULL */ + return (error); +} + +/* + * Shutdown node + */ +static int +ng_UI_rmnode(node_p node) +{ + const priv_p priv = node->private; + + /* Take down netgraph node */ + node->flags |= NG_INVALID; + ng_cutlinks(node); + ng_unname(node); + bzero(priv, sizeof(*priv)); + FREE(priv, M_NETGRAPH); + node->private = NULL; + ng_unref(node); + return (0); +} + +/* + * Hook disconnection + */ +static int +ng_UI_disconnect(hook_p hook) +{ + const priv_p priv = hook->node->private; + + if (hook->node->numhooks == 0) + ng_rmnode(hook->node); + else if (hook == priv->downlink) + priv->downlink = NULL; + else if (hook == priv->uplink) + priv->uplink = NULL; + else + panic(__FUNCTION__); + return (0); +} + |