3 * Copyright (c) 1999-2001, Vitaly V Belekhov
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice unmodified, this list of conditions, and the following
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * $FreeBSD: src/sys/netgraph/ng_eiface.c,v 1.39 2007/07/26 10:54:33 glebius Exp $
29 * $DragonFly: src/sys/netgraph7/ng_eiface.c,v 1.2 2008/06/26 23:05:35 dillon Exp $
32 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/errno.h>
35 #include <sys/kernel.h>
36 #include <sys/malloc.h>
38 #include <sys/errno.h>
39 #include <sys/sockio.h>
40 #include <sys/socket.h>
41 #include <sys/syslog.h>
44 #include <net/if_types.h>
45 #include <net/netisr.h>
47 #include "ng_message.h"
50 #include "ng_eiface.h"
53 #include <net/ethernet.h>
54 #include <net/if_arp.h>
56 static const struct ng_cmdlist ng_eiface_cmdlist[] = {
59 NGM_EIFACE_GET_IFNAME,
68 &ng_parse_enaddr_type,
74 /* Node private data */
75 struct ng_eiface_private {
76 struct ifnet *ifp; /* per-interface network data */
77 int unit; /* Interface unit number */
78 node_p node; /* Our netgraph node */
79 hook_p ether; /* Hook for ethernet stream */
81 typedef struct ng_eiface_private *priv_p;
83 /* Interface methods */
84 static void ng_eiface_init(void *xsc);
85 static void ng_eiface_start(struct ifnet *ifp);
86 static int ng_eiface_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data);
88 static void ng_eiface_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data);
91 /* Netgraph methods */
92 static int ng_eiface_mod_event(module_t, int, void *);
93 static ng_constructor_t ng_eiface_constructor;
94 static ng_rcvmsg_t ng_eiface_rcvmsg;
95 static ng_shutdown_t ng_eiface_rmnode;
96 static ng_newhook_t ng_eiface_newhook;
97 static ng_rcvdata_t ng_eiface_rcvdata;
98 static ng_disconnect_t ng_eiface_disconnect;
100 /* Node type descriptor */
101 static struct ng_type typestruct = {
102 .version = NG_ABI_VERSION,
103 .name = NG_EIFACE_NODE_TYPE,
104 .mod_event = ng_eiface_mod_event,
105 .constructor = ng_eiface_constructor,
106 .rcvmsg = ng_eiface_rcvmsg,
107 .shutdown = ng_eiface_rmnode,
108 .newhook = ng_eiface_newhook,
109 .rcvdata = ng_eiface_rcvdata,
110 .disconnect = ng_eiface_disconnect,
111 .cmdlist = ng_eiface_cmdlist
113 NETGRAPH_INIT(eiface, &typestruct);
115 static struct unrhdr *ng_eiface_unit;
117 /************************************************************************
119 ************************************************************************/
122 * Process an ioctl for the virtual interface
125 ng_eiface_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
127 struct ifreq *const ifr = (struct ifreq *)data;
131 ng_eiface_print_ioctl(ifp, command, data);
136 /* These two are mostly handled at a higher layer */
138 error = ether_ioctl(ifp, command, data);
146 * If the interface is marked up and stopped, then start it.
147 * If it is marked down and running, then stop it.
149 if (ifp->if_flags & IFF_UP) {
150 if (!(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
151 ifp->if_drv_flags &= ~(IFF_DRV_OACTIVE);
152 ifp->if_drv_flags |= IFF_DRV_RUNNING;
155 if (ifp->if_drv_flags & IFF_DRV_RUNNING)
156 ifp->if_drv_flags &= ~(IFF_DRV_RUNNING |
161 /* Set the interface MTU */
163 if (ifr->ifr_mtu > NG_EIFACE_MTU_MAX ||
164 ifr->ifr_mtu < NG_EIFACE_MTU_MIN)
167 ifp->if_mtu = ifr->ifr_mtu;
170 /* Stuff that's not supported */
188 ng_eiface_init(void *xsc)
191 struct ifnet *ifp = sc->ifp;
196 ifp->if_drv_flags |= IFF_DRV_RUNNING;
197 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
203 * We simply relay the packet to the "ether" hook, if it is connected.
204 * We have been through the netgraph locking and are guaranteed to
205 * be the only code running in this node at this time.
208 ng_eiface_start2(node_p node, hook_p hook, void *arg1, int arg2)
210 struct ifnet *ifp = arg1;
211 const priv_p priv = (priv_p)ifp->if_softc;
215 /* Check interface flags */
217 if (!((ifp->if_flags & IFF_UP) &&
218 (ifp->if_drv_flags & IFF_DRV_RUNNING)))
223 * Grab a packet to transmit.
225 IF_DEQUEUE(&ifp->if_snd, m);
227 /* If there's nothing to send, break. */
232 * Berkeley packet filter.
233 * Pass packet to bpf if there is a listener.
234 * XXX is this safe? locking?
238 if (ifp->if_flags & IFF_MONITOR) {
245 * Send packet; if hook is not connected, mbuf will get
248 NG_SEND_DATA_ONLY(error, priv->ether, m);
257 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
263 * This routine is called to deliver a packet out the interface.
264 * We simply queue the netgraph version to be called when netgraph locking
265 * allows it to happen.
266 * Until we know what the rest of the networking code is doing for
267 * locking, we don't know how we will interact with it.
268 * Take comfort from the fact that the ifnet struct is part of our
269 * private info and can't go away while we are queued.
270 * [Though we don't know it is still there now....]
271 * it is possible we don't gain anything from this because
272 * we would like to get the mbuf and queue it as data
273 * somehow, but we can't and if we did would we solve anything?
276 ng_eiface_start(struct ifnet *ifp)
279 const priv_p priv = (priv_p)ifp->if_softc;
281 /* Don't do anything if output is active */
282 if (ifp->if_drv_flags & IFF_DRV_OACTIVE)
285 ifp->if_drv_flags |= IFF_DRV_OACTIVE;
287 if (ng_send_fn(priv->node, NULL, &ng_eiface_start2, ifp, 0) != 0)
288 ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
293 * Display an ioctl to the virtual interface
297 ng_eiface_print_ioctl(struct ifnet *ifp, int command, caddr_t data)
301 switch (command & IOC_DIRMASK) {
317 log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n",
322 IOCPARM_LEN(command));
326 /************************************************************************
328 ************************************************************************/
331 * Constructor for a node
334 ng_eiface_constructor(node_p node)
338 u_char eaddr[6] = {0,0,0,0,0,0};
340 /* Allocate node and interface private structures */
341 priv = kmalloc(sizeof(*priv), M_NETGRAPH,
342 M_WAITOK | M_NULLOK | M_ZERO);
346 ifp = priv->ifp = if_alloc(IFT_ETHER);
348 kfree(priv, M_NETGRAPH);
352 /* Link them together */
353 ifp->if_softc = priv;
355 /* Get an interface unit number */
356 priv->unit = alloc_unr(ng_eiface_unit);
358 /* Link together node and private info */
359 NG_NODE_SET_PRIVATE(node, priv);
362 /* Initialize interface structure */
363 if_initname(ifp, NG_EIFACE_EIFACE_NAME, priv->unit);
364 ifp->if_init = ng_eiface_init;
365 ifp->if_output = ether_output;
366 ifp->if_start = ng_eiface_start;
367 ifp->if_ioctl = ng_eiface_ioctl;
368 ifp->if_watchdog = NULL;
369 ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;
370 ifp->if_flags = (IFF_SIMPLEX | IFF_BROADCAST | IFF_MULTICAST);
373 /* Give this node name */
374 bzero(ifname, sizeof(ifname));
375 sprintf(ifname, "if%s", ifp->if_xname);
376 (void)ng_name_node(node, ifname);
379 /* Attach the interface */
380 ether_ifattach(ifp, eaddr);
387 * Give our ok for a hook to be added
390 ng_eiface_newhook(node_p node, hook_p hook, const char *name)
392 priv_p priv = NG_NODE_PRIVATE(node);
393 struct ifnet *ifp = priv->ifp;
395 if (strcmp(name, NG_EIFACE_HOOK_ETHER))
396 return (EPFNOSUPPORT);
397 if (priv->ether != NULL)
400 NG_HOOK_SET_PRIVATE(hook, &priv->ether);
402 if_link_state_change(ifp, LINK_STATE_UP);
408 * Receive a control message
411 ng_eiface_rcvmsg(node_p node, item_p item, hook_p lasthook)
413 const priv_p priv = NG_NODE_PRIVATE(node);
414 struct ifnet *const ifp = priv->ifp;
415 struct ng_mesg *resp = NULL;
419 NGI_GET_MSG(item, msg);
420 switch (msg->header.typecookie) {
421 case NGM_EIFACE_COOKIE:
422 switch (msg->header.cmd) {
426 if (msg->header.arglen != ETHER_ADDR_LEN) {
430 error = if_setlladdr(priv->ifp,
431 (u_char *)msg->data, ETHER_ADDR_LEN);
435 case NGM_EIFACE_GET_IFNAME:
436 NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_WAITOK | M_NULLOK);
441 strlcpy(resp->data, ifp->if_xname, IFNAMSIZ);
444 case NGM_EIFACE_GET_IFADDRS:
450 #define SA_SIZE(s) ((s)->sa_len<sizeof(*(s))? sizeof(*(s)):(s)->sa_len)
452 /* Determine size of response and allocate it */
454 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
455 buflen += SA_SIZE(ifa->ifa_addr);
456 NG_MKRESPONSE(resp, msg, buflen, M_WAITOK | M_NULLOK);
464 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
465 const int len = SA_SIZE(ifa->ifa_addr);
468 log(LOG_ERR, "%s: len changed?\n",
472 bcopy(ifa->ifa_addr, ptr, len);
483 } /* end of inner switch() */
485 case NGM_FLOW_COOKIE:
486 switch (msg->header.cmd) {
488 if_link_state_change(ifp, LINK_STATE_UP);
490 case NGM_LINK_IS_DOWN:
491 if_link_state_change(ifp, LINK_STATE_DOWN);
501 NG_RESPOND_MSG(error, node, item, resp);
507 * Receive data from a hook. Pass the packet to the ether_input routine.
510 ng_eiface_rcvdata(hook_p hook, item_p item)
512 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
513 struct ifnet *const ifp = priv->ifp;
519 if (!((ifp->if_flags & IFF_UP) &&
520 (ifp->if_drv_flags & IFF_DRV_RUNNING))) {
525 if (m->m_len < ETHER_HDR_LEN) {
526 m = m_pullup(m, ETHER_HDR_LEN);
531 /* Note receiving interface */
532 m->m_pkthdr.rcvif = ifp;
534 /* Update interface stats */
537 (*ifp->if_input)(ifp, m);
544 * Shutdown processing.
547 ng_eiface_rmnode(node_p node)
549 const priv_p priv = NG_NODE_PRIVATE(node);
550 struct ifnet *const ifp = priv->ifp;
554 free_unr(ng_eiface_unit, priv->unit);
555 kfree(priv, M_NETGRAPH);
556 NG_NODE_SET_PRIVATE(node, NULL);
565 ng_eiface_disconnect(hook_p hook)
567 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
574 * Handle loading and unloading for this node type.
577 ng_eiface_mod_event(module_t mod, int event, void *data)
583 ng_eiface_unit = new_unrhdr(0, 0xffff, NULL);
586 delete_unrhdr(ng_eiface_unit);