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
32 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/errno.h>
35 #include <sys/kernel.h>
37 #include <sys/malloc.h>
39 #include <sys/mutex.h>
40 #include <sys/errno.h>
41 #include <sys/sockio.h>
42 #include <sys/socket.h>
43 #include <sys/syslog.h>
46 #include <net/if_dl.h>
47 #include <net/if_types.h>
48 #include <net/netisr.h>
50 #include <netinet/in.h>
51 #include <netinet/if_ether.h>
53 #include <netgraph/ng_message.h>
54 #include <netgraph/netgraph.h>
55 #include <netgraph/ng_parse.h>
56 #include <netgraph/ng_eiface.h>
59 #include <net/ethernet.h>
60 #include <net/if_arp.h>
62 static const struct ng_cmdlist ng_eiface_cmdlist[] = {
67 &ng_parse_enaddr_type,
74 /* Node private data */
75 struct ng_eiface_private {
76 struct arpcom arpcom; /* per-interface network data */
77 struct ifnet *ifp; /* This interface */
78 int unit; /* Interface unit number */
79 node_p node; /* Our netgraph node */
80 hook_p ether; /* Hook for ethernet stream */
82 typedef struct ng_eiface_private *priv_p;
84 /* Interface methods */
85 static void ng_eiface_init(void *xsc);
86 static void ng_eiface_start(struct ifnet *ifp);
87 static int ng_eiface_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data);
89 static void ng_eiface_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data);
92 /* Netgraph methods */
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_connect_t ng_eiface_connect;
99 static ng_disconnect_t ng_eiface_disconnect;
101 /* Node type descriptor */
102 static struct ng_type typestruct = {
103 .version = NG_ABI_VERSION,
104 .name = NG_EIFACE_NODE_TYPE,
105 .constructor = ng_eiface_constructor,
106 .rcvmsg = ng_eiface_rcvmsg,
107 .shutdown = ng_eiface_rmnode,
108 .newhook = ng_eiface_newhook,
109 .connect = ng_eiface_connect,
110 .rcvdata = ng_eiface_rcvdata,
111 .disconnect = ng_eiface_disconnect,
112 .cmdlist = ng_eiface_cmdlist
114 NETGRAPH_INIT(eiface, &typestruct);
116 /* We keep a bitmap indicating which unit numbers are free.
117 One means the unit number is free, zero means it's taken. */
118 static int *ng_eiface_units = NULL;
119 static int ng_eiface_units_len = 0;
120 static int ng_units_in_use = 0;
122 #define UNITS_BITSPERWORD (sizeof(*ng_eiface_units) * NBBY)
124 static struct mtx ng_eiface_mtx;
125 MTX_SYSINIT(ng_eiface, &ng_eiface_mtx, "ng_eiface", MTX_DEF);
127 /************************************************************************
129 ************************************************************************/
131 * Find the first free unit number for a new interface.
132 * Increase the size of the unit bitmap as necessary.
135 ng_eiface_get_unit(int *unit)
139 mtx_lock(&ng_eiface_mtx);
140 for (index = 0; index < ng_eiface_units_len
141 && ng_eiface_units[index] == 0; index++);
142 if (index == ng_eiface_units_len) { /* extend array */
143 int i, *newarray, newlen;
145 newlen = (2 * ng_eiface_units_len) + 4;
146 MALLOC(newarray, int *, newlen * sizeof(*ng_eiface_units),
147 M_NETGRAPH, M_NOWAIT);
148 if (newarray == NULL) {
149 mtx_unlock(&ng_eiface_mtx);
152 bcopy(ng_eiface_units, newarray,
153 ng_eiface_units_len * sizeof(*ng_eiface_units));
154 for (i = ng_eiface_units_len; i < newlen; i++)
156 if (ng_eiface_units != NULL)
157 FREE(ng_eiface_units, M_NETGRAPH);
158 ng_eiface_units = newarray;
159 ng_eiface_units_len = newlen;
161 bit = ffs(ng_eiface_units[index]) - 1;
162 KASSERT(bit >= 0 && bit <= UNITS_BITSPERWORD - 1,
163 ("%s: word=%d bit=%d", __func__, ng_eiface_units[index], bit));
164 ng_eiface_units[index] &= ~(1 << bit);
165 *unit = (index * UNITS_BITSPERWORD) + bit;
167 mtx_unlock(&ng_eiface_mtx);
172 * Free a no longer needed unit number.
175 ng_eiface_free_unit(int unit)
179 index = unit / UNITS_BITSPERWORD;
180 bit = unit % UNITS_BITSPERWORD;
181 mtx_lock(&ng_eiface_mtx);
182 KASSERT(index < ng_eiface_units_len,
183 ("%s: unit=%d len=%d", __func__, unit, ng_eiface_units_len));
184 KASSERT((ng_eiface_units[index] & (1 << bit)) == 0,
185 ("%s: unit=%d is free", __func__, unit));
186 ng_eiface_units[index] |= (1 << bit);
188 * XXX We could think about reducing the size of ng_eiface_units[]
189 * XXX here if the last portion is all ones
190 * XXX At least free it if no more units.
191 * Needed if we are to eventually be able to unload.
194 if (ng_units_in_use == 0) { /* XXX make SMP safe */
195 FREE(ng_eiface_units, M_NETGRAPH);
196 ng_eiface_units_len = 0;
197 ng_eiface_units = NULL;
199 mtx_unlock(&ng_eiface_mtx);
202 /************************************************************************
204 ************************************************************************/
207 * Process an ioctl for the virtual interface
210 ng_eiface_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
212 struct ifreq *const ifr = (struct ifreq *)data;
216 ng_eiface_print_ioctl(ifp, command, data);
221 /* These two are mostly handled at a higher layer */
223 error = ether_ioctl(ifp, command, data);
231 * If the interface is marked up and stopped, then
232 * start it. If it is marked down and running,
235 if (ifr->ifr_flags & IFF_UP) {
236 if (!(ifp->if_flags & IFF_RUNNING)) {
237 ifp->if_flags &= ~(IFF_OACTIVE);
238 ifp->if_flags |= IFF_RUNNING;
241 if (ifp->if_flags & IFF_RUNNING)
243 &= ~(IFF_RUNNING | IFF_OACTIVE);
247 /* Set the interface MTU */
249 if (ifr->ifr_mtu > NG_EIFACE_MTU_MAX
250 || ifr->ifr_mtu < NG_EIFACE_MTU_MIN)
253 ifp->if_mtu = ifr->ifr_mtu;
256 /* Stuff that's not supported */
274 ng_eiface_init(void *xsc)
277 struct ifnet *ifp = sc->ifp;
282 ifp->if_flags |= IFF_RUNNING;
283 ifp->if_flags &= ~IFF_OACTIVE;
289 * We simply relay the packet to the ether hook, if it is connected.
290 * We have been throughthe netgraph locking an are guaranteed to
291 * be the only code running in this node at this time.
294 ng_eiface_start2(node_p node, hook_p hook, void *arg1, int arg2)
296 struct ifnet *ifp = arg1;
297 const priv_p priv = (priv_p) ifp->if_softc;
301 /* Check interface flags */
302 if ((ifp->if_flags & (IFF_UP | IFF_RUNNING)) != (IFF_UP | IFF_RUNNING))
305 /* Don't do anything if output is active */
306 if (ifp->if_flags & IFF_OACTIVE)
309 ifp->if_flags |= IFF_OACTIVE;
312 * Grab a packet to transmit.
314 IF_DEQUEUE(&ifp->if_snd, m);
316 /* If there's nothing to send, return. */
318 ifp->if_flags &= ~IFF_OACTIVE;
322 /* Berkeley packet filter
323 * Pass packet to bpf if there is a listener.
324 * XXX is this safe? locking?
328 /* Copy length before the mbuf gets invalidated */
329 len = m->m_pkthdr.len;
332 * Send packet; if hook is not connected, mbuf will get
335 NG_SEND_DATA_ONLY(error, priv->ether, m);
339 ifp->if_obytes += len;
342 ifp->if_flags &= ~IFF_OACTIVE;
347 * This routine is called to deliver a packet out the interface.
348 * We simply queue the netgraph version to be called when netgraph locking
349 * allows it to happen.
350 * Until we know what the rest of the networking code is doing for
351 * locking, we don't know how we will interact with it.
352 * Take comfort from the fact that the ifnet struct is part of our
353 * private info and can't go away while we are queued.
354 * [Though we don't know it is still there now....]
355 * it is possible we don't gain anything from this because
356 * we would like to get the mbuf and queue it as data
357 * somehow, but we can't and if we did would we solve anything?
360 ng_eiface_start(struct ifnet *ifp)
363 const priv_p priv = (priv_p) ifp->if_softc;
365 ng_send_fn(priv->node, NULL, &ng_eiface_start2, ifp, 0);
370 * Display an ioctl to the virtual interface
374 ng_eiface_print_ioctl(struct ifnet *ifp, int command, caddr_t data){
377 switch (command & IOC_DIRMASK)
394 log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n",
399 IOCPARM_LEN(command));
403 /************************************************************************
405 ************************************************************************/
408 * Constructor for a node
411 ng_eiface_constructor(node_p node)
417 /* Allocate node and interface private structures */
418 MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_WAITOK);
422 bzero(priv, sizeof(*priv));
424 ifp = &(priv->arpcom.ac_if);
426 /* Link them together */
427 ifp->if_softc = priv;
430 /* Get an interface unit number */
431 if ((error = ng_eiface_get_unit(&priv->unit)) != 0) {
432 FREE(priv, M_NETGRAPH);
436 /* Link together node and private info */
437 NG_NODE_SET_PRIVATE(node, priv);
440 /* Initialize interface structure */
441 if_initname(ifp, NG_EIFACE_EIFACE_NAME, priv->unit);
442 ifp->if_init = ng_eiface_init;
443 ifp->if_output = ether_output;
444 ifp->if_start = ng_eiface_start;
445 ifp->if_ioctl = ng_eiface_ioctl;
446 ifp->if_watchdog = NULL;
447 ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;
448 ifp->if_flags = (IFF_SIMPLEX | IFF_BROADCAST | IFF_MULTICAST);
451 * Give this node name * bzero(ifname, sizeof(ifname));
452 * sprintf(ifname, "if%s", ifp->if_xname); (void)
453 * ng_name_node(node, ifname);
456 /* Attach the interface */
457 ether_ifattach(ifp, priv->arpcom.ac_enaddr);
464 * Give our ok for a hook to be added
467 ng_eiface_newhook(node_p node, hook_p hook, const char *name)
469 priv_p priv = NG_NODE_PRIVATE(node);
471 if (strcmp(name, NG_EIFACE_HOOK_ETHER))
472 return (EPFNOSUPPORT);
473 if (priv->ether != NULL)
476 NG_HOOK_SET_PRIVATE(hook, &priv->ether);
482 * Receive a control message
485 ng_eiface_rcvmsg(node_p node, item_p item, hook_p lasthook)
487 priv_p priv = NG_NODE_PRIVATE(node);
488 struct ifnet *const ifp = priv->ifp;
489 struct ng_mesg *resp = NULL;
493 NGI_GET_MSG(item, msg);
494 switch (msg->header.typecookie) {
495 case NGM_EIFACE_COOKIE:
496 switch (msg->header.cmd) {
499 struct ether_addr *eaddr;
501 struct sockaddr_dl *sdl;
503 if (msg->header.arglen != sizeof(struct ether_addr)){
507 eaddr = (struct ether_addr *)(msg->data);
508 bcopy(eaddr, priv->arpcom.ac_enaddr, ETHER_ADDR_LEN);
510 /* And put it in the ifaddr list */
511 TAILQ_FOREACH(ifa, &(ifp->if_addrhead), ifa_link) {
512 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
513 if (sdl->sdl_type == IFT_ETHER) {
514 bcopy((IFP2AC(ifp))->ac_enaddr,
515 LLADDR(sdl), ifp->if_addrlen);
522 case NGM_EIFACE_GET_IFNAME:
524 struct ng_eiface_ifname *arg;
526 NG_MKRESPONSE(resp, msg, sizeof(*arg), M_NOWAIT);
531 arg = (struct ng_eiface_ifname *)resp->data;
532 strlcpy(arg->ngif_name, ifp->if_xname,
533 sizeof(arg->ngif_name));
537 case NGM_EIFACE_GET_IFADDRS:
543 #define SA_SIZE(s) ((s)->sa_len<sizeof(*(s))? sizeof(*(s)):(s)->sa_len)
545 /* Determine size of response and allocate it */
547 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
548 buflen += SA_SIZE(ifa->ifa_addr);
549 NG_MKRESPONSE(resp, msg, buflen, M_NOWAIT);
556 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
557 const int len = SA_SIZE(ifa->ifa_addr);
560 log(LOG_ERR, "%s: len changed?\n",
564 bcopy(ifa->ifa_addr, ptr, len);
575 } /* end of inner switch() */
581 NG_RESPOND_MSG(error, node, item, resp);
587 * Recive data from a hook. Pass the packet to the ether_input routine.
590 ng_eiface_rcvdata(hook_p hook, item_p item)
592 priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
593 struct ifnet *const ifp = priv->ifp;
599 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) {
604 /* Note receiving interface */
605 m->m_pkthdr.rcvif = ifp;
607 /* Update interface stats */
610 (*ifp->if_input)(ifp, m);
620 ng_eiface_rmnode(node_p node)
622 priv_p priv = NG_NODE_PRIVATE(node);
623 struct ifnet *const ifp = priv->ifp;
626 ng_eiface_free_unit(priv->unit);
627 FREE(priv, M_NETGRAPH);
628 NG_NODE_SET_PRIVATE(node, NULL);
635 * This is called once we've already connected a new hook to the other node.
636 * It gives us a chance to balk at the last minute.
639 ng_eiface_connect(hook_p hook)
641 /* be really amiable and just say "YUP that's OK by me! " */
649 ng_eiface_disconnect(hook_p hook)
651 priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));