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>
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_dl.h>
45 #include <net/if_types.h>
46 #include <net/netisr.h>
48 #include <netinet/in.h>
49 #include <netinet/if_ether.h>
51 #include <netgraph/ng_message.h>
52 #include <netgraph/netgraph.h>
53 #include <netgraph/ng_parse.h>
54 #include <netgraph/ng_eiface.h>
57 #include <net/ethernet.h>
58 #include <net/if_arp.h>
60 static const struct ng_cmdlist ng_eiface_cmdlist[] = {
65 &ng_parse_enaddr_type,
72 /* Node private data */
73 struct ng_eiface_private {
74 struct arpcom arpcom; /* per-interface network data */
75 struct ifnet *ifp; /* This interface */
76 int unit; /* Interface unit number */
77 node_p node; /* Our netgraph node */
78 hook_p ether; /* Hook for ethernet stream */
80 typedef struct ng_eiface_private *priv_p;
82 /* Interface methods */
83 static void ng_eiface_init(void *xsc);
84 static void ng_eiface_start(struct ifnet *ifp);
85 static int ng_eiface_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data);
87 static void ng_eiface_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data);
90 /* Netgraph methods */
91 static ng_constructor_t ng_eiface_constructor;
92 static ng_rcvmsg_t ng_eiface_rcvmsg;
93 static ng_shutdown_t ng_eiface_rmnode;
94 static ng_newhook_t ng_eiface_newhook;
95 static ng_rcvdata_t ng_eiface_rcvdata;
96 static ng_connect_t ng_eiface_connect;
97 static ng_disconnect_t ng_eiface_disconnect;
99 /* Node type descriptor */
100 static struct ng_type typestruct = {
104 ng_eiface_constructor,
111 ng_eiface_disconnect,
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)
125 /************************************************************************
127 ************************************************************************/
129 * Find the first free unit number for a new interface.
130 * Increase the size of the unit bitmap as necessary.
132 static __inline__ int
133 ng_eiface_get_unit(int *unit)
137 for (index = 0; index < ng_eiface_units_len
138 && ng_eiface_units[index] == 0; index++);
139 if (index == ng_eiface_units_len) { /* extend array */
140 int i, *newarray, newlen;
142 newlen = (2 * ng_eiface_units_len) + 4;
143 MALLOC(newarray, int *, newlen * sizeof(*ng_eiface_units),
144 M_NETGRAPH, M_NOWAIT);
145 if (newarray == NULL)
147 bcopy(ng_eiface_units, newarray,
148 ng_eiface_units_len * sizeof(*ng_eiface_units));
149 for (i = ng_eiface_units_len; i < newlen; i++)
151 if (ng_eiface_units != NULL)
152 FREE(ng_eiface_units, M_NETGRAPH);
153 ng_eiface_units = newarray;
154 ng_eiface_units_len = newlen;
156 bit = ffs(ng_eiface_units[index]) - 1;
157 KASSERT(bit >= 0 && bit <= UNITS_BITSPERWORD - 1,
158 ("%s: word=%d bit=%d", __func__, ng_eiface_units[index], bit));
159 ng_eiface_units[index] &= ~(1 << bit);
160 *unit = (index * UNITS_BITSPERWORD) + bit;
166 * Free a no longer needed unit number.
168 static __inline__ void
169 ng_eiface_free_unit(int unit)
173 index = unit / UNITS_BITSPERWORD;
174 bit = unit % UNITS_BITSPERWORD;
175 KASSERT(index < ng_eiface_units_len,
176 ("%s: unit=%d len=%d", __func__, unit, ng_eiface_units_len));
177 KASSERT((ng_eiface_units[index] & (1 << bit)) == 0,
178 ("%s: unit=%d is free", __func__, unit));
179 ng_eiface_units[index] |= (1 << bit);
181 * XXX We could think about reducing the size of ng_eiface_units[]
182 * XXX here if the last portion is all ones
183 * XXX At least free it if no more units.
184 * Needed if we are to eventually be able to unload.
187 if (ng_units_in_use == 0) { /* XXX make SMP safe */
188 FREE(ng_eiface_units, M_NETGRAPH);
189 ng_eiface_units_len = 0;
190 ng_eiface_units = NULL;
194 /************************************************************************
196 ************************************************************************/
199 * Process an ioctl for the virtual interface
202 ng_eiface_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
204 struct ifreq *const ifr = (struct ifreq *)data;
208 ng_eiface_print_ioctl(ifp, command, data);
213 /* These two are mostly handled at a higher layer */
215 error = ether_ioctl(ifp, command, data);
223 * If the interface is marked up and stopped, then
224 * start it. If it is marked down and running,
227 if (ifr->ifr_flags & IFF_UP) {
228 if (!(ifp->if_flags & IFF_RUNNING)) {
229 ifp->if_flags &= ~(IFF_OACTIVE);
230 ifp->if_flags |= IFF_RUNNING;
233 if (ifp->if_flags & IFF_RUNNING)
235 &= ~(IFF_RUNNING | IFF_OACTIVE);
239 /* Set the interface MTU */
241 if (ifr->ifr_mtu > NG_EIFACE_MTU_MAX
242 || ifr->ifr_mtu < NG_EIFACE_MTU_MIN)
245 ifp->if_mtu = ifr->ifr_mtu;
248 /* Stuff that's not supported */
266 ng_eiface_init(void *xsc)
269 struct ifnet *ifp = sc->ifp;
274 ifp->if_flags |= IFF_RUNNING;
275 ifp->if_flags &= ~IFF_OACTIVE;
281 * We simply relay the packet to the ether hook, if it is connected.
282 * We have been throughthe netgraph locking an are guaranteed to
283 * be the only code running in this node at this time.
286 ng_eiface_start2(node_p node, hook_p hook, void *arg1, int arg2)
288 struct ifnet *ifp = arg1;
289 const priv_p priv = (priv_p) ifp->if_softc;
293 /* Check interface flags */
294 if ((ifp->if_flags & (IFF_UP | IFF_RUNNING)) != (IFF_UP | IFF_RUNNING))
297 /* Don't do anything if output is active */
298 if (ifp->if_flags & IFF_OACTIVE)
301 ifp->if_flags |= IFF_OACTIVE;
304 * Grab a packet to transmit.
306 IF_DEQUEUE(&ifp->if_snd, m);
308 /* If there's nothing to send, return. */
310 ifp->if_flags &= ~IFF_OACTIVE;
314 /* Berkeley packet filter
315 * Pass packet to bpf if there is a listener.
316 * XXX is this safe? locking?
320 /* Copy length before the mbuf gets invalidated */
321 len = m->m_pkthdr.len;
324 * Send packet; if hook is not connected, mbuf will get
327 NG_SEND_DATA_ONLY(error, priv->ether, m);
331 ifp->if_obytes += len;
334 ifp->if_flags &= ~IFF_OACTIVE;
339 * This routine is called to deliver a packet out the interface.
340 * We simply queue the netgraph version to be called when netgraph locking
341 * allows it to happen.
342 * Until we know what the rest of the networking code is doing for
343 * locking, we don't know how we will interact with it.
344 * Take comfort from the fact that the ifnet struct is part of our
345 * private info and can't go away while we are queued.
346 * [Though we don't know it is still there now....]
347 * it is possible we don't gain anything from this because
348 * we would like to get the mbuf and queue it as data
349 * somehow, but we can't and if we did would we solve anything?
352 ng_eiface_start(struct ifnet *ifp)
355 const priv_p priv = (priv_p) ifp->if_softc;
357 ng_send_fn(priv->node, NULL, &ng_eiface_start2, ifp, 0);
362 * Display an ioctl to the virtual interface
366 ng_eiface_print_ioctl(struct ifnet *ifp, int command, caddr_t data){
369 switch (command & IOC_DIRMASK)
386 log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n",
391 IOCPARM_LEN(command));
395 /************************************************************************
397 ************************************************************************/
400 * Constructor for a node
403 ng_eiface_constructor(node_p node)
409 /* Allocate node and interface private structures */
410 MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_WAITOK);
414 bzero(priv, sizeof(*priv));
416 ifp = &(priv->arpcom.ac_if);
418 /* Link them together */
419 ifp->if_softc = priv;
422 /* Get an interface unit number */
423 if ((error = ng_eiface_get_unit(&priv->unit)) != 0) {
424 FREE(priv, M_NETGRAPH);
428 /* Link together node and private info */
429 NG_NODE_SET_PRIVATE(node, priv);
432 /* Initialize interface structure */
433 if_initname(ifp, NG_EIFACE_EIFACE_NAME, priv->unit);
434 ifp->if_init = ng_eiface_init;
435 ifp->if_output = ether_output;
436 ifp->if_start = ng_eiface_start;
437 ifp->if_ioctl = ng_eiface_ioctl;
438 ifp->if_watchdog = NULL;
439 ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;
440 ifp->if_flags = (IFF_SIMPLEX | IFF_BROADCAST | IFF_MULTICAST);
443 * Give this node name * bzero(ifname, sizeof(ifname));
444 * sprintf(ifname, "if%s", ifp->if_xname); (void)
445 * ng_name_node(node, ifname);
448 /* Attach the interface */
449 ether_ifattach(ifp, priv->arpcom.ac_enaddr);
456 * Give our ok for a hook to be added
459 ng_eiface_newhook(node_p node, hook_p hook, const char *name)
461 priv_p priv = NG_NODE_PRIVATE(node);
463 if (strcmp(name, NG_EIFACE_HOOK_ETHER))
464 return (EPFNOSUPPORT);
465 if (priv->ether != NULL)
468 NG_HOOK_SET_PRIVATE(hook, &priv->ether);
474 * Receive a control message
477 ng_eiface_rcvmsg(node_p node, item_p item, hook_p lasthook)
479 priv_p priv = NG_NODE_PRIVATE(node);
480 struct ifnet *const ifp = priv->ifp;
481 struct ng_mesg *resp = NULL;
485 NGI_GET_MSG(item, msg);
486 switch (msg->header.typecookie) {
487 case NGM_EIFACE_COOKIE:
488 switch (msg->header.cmd) {
491 struct ether_addr *eaddr;
493 struct sockaddr_dl *sdl;
495 if (msg->header.arglen != sizeof(struct ether_addr)){
499 eaddr = (struct ether_addr *)(msg->data);
500 bcopy(eaddr, priv->arpcom.ac_enaddr, ETHER_ADDR_LEN);
502 /* And put it in the ifaddr list */
503 TAILQ_FOREACH(ifa, &(ifp->if_addrhead), ifa_link) {
504 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
505 if (sdl->sdl_type == IFT_ETHER) {
506 bcopy((IFP2AC(ifp))->ac_enaddr,
507 LLADDR(sdl), ifp->if_addrlen);
514 case NGM_EIFACE_GET_IFNAME:
516 struct ng_eiface_ifname *arg;
518 NG_MKRESPONSE(resp, msg, sizeof(*arg), M_NOWAIT);
523 arg = (struct ng_eiface_ifname *)resp->data;
524 strlcpy(arg->ngif_name, ifp->if_xname,
525 sizeof(arg->ngif_name));
529 case NGM_EIFACE_GET_IFADDRS:
535 #define SA_SIZE(s) ((s)->sa_len<sizeof(*(s))? sizeof(*(s)):(s)->sa_len)
537 /* Determine size of response and allocate it */
539 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
540 buflen += SA_SIZE(ifa->ifa_addr);
541 NG_MKRESPONSE(resp, msg, buflen, M_NOWAIT);
548 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
549 const int len = SA_SIZE(ifa->ifa_addr);
552 log(LOG_ERR, "%s: len changed?\n",
556 bcopy(ifa->ifa_addr, ptr, len);
567 } /* end of inner switch() */
573 NG_RESPOND_MSG(error, node, item, resp);
579 * Recive data from a hook. Pass the packet to the ether_input routine.
582 ng_eiface_rcvdata(hook_p hook, item_p item)
584 priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
585 struct ifnet *const ifp = priv->ifp;
589 /* Meta-data ends its life here... */
594 printf("ng_eiface: mbuf is null.\n");
597 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) {
602 /* Note receiving interface */
603 m->m_pkthdr.rcvif = ifp;
605 /* Update interface stats */
608 (*ifp->if_input)(ifp, m);
618 ng_eiface_rmnode(node_p node)
620 priv_p priv = NG_NODE_PRIVATE(node);
621 struct ifnet *const ifp = priv->ifp;
624 ng_eiface_free_unit(priv->unit);
625 FREE(priv, M_NETGRAPH);
626 NG_NODE_SET_PRIVATE(node, NULL);
633 * This is called once we've already connected a new hook to the other node.
634 * It gives us a chance to balk at the last minute.
637 ng_eiface_connect(hook_p hook)
639 /* be really amiable and just say "YUP that's OK by me! " */
647 ng_eiface_disconnect(hook_p hook)
649 priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));