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
31 #include <sys/param.h>
32 #include <sys/systm.h>
33 #include <sys/errno.h>
34 #include <sys/kernel.h>
35 #include <sys/malloc.h>
37 #include <sys/errno.h>
38 #include <sys/sockio.h>
39 #include <sys/socket.h>
40 #include <sys/syslog.h>
43 #include <net/if_dl.h>
44 #include <net/if_types.h>
45 #include <net/netisr.h>
47 #include <netgraph/ng_message.h>
48 #include <netgraph/netgraph.h>
49 #include <netgraph/ng_parse.h>
50 #include <netgraph/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 arpcom arpcom; /* per-interface network data */
77 #define sc_ifp arpcom.ac_if
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 int ng_eiface_mod_event(module_t, int, void *);
94 static ng_constructor_t ng_eiface_constructor;
95 static ng_rcvmsg_t ng_eiface_rcvmsg;
96 static ng_shutdown_t ng_eiface_rmnode;
97 static ng_newhook_t ng_eiface_newhook;
98 static ng_rcvdata_t ng_eiface_rcvdata;
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 .mod_event = ng_eiface_mod_event,
106 .constructor = ng_eiface_constructor,
107 .rcvmsg = ng_eiface_rcvmsg,
108 .shutdown = ng_eiface_rmnode,
109 .newhook = ng_eiface_newhook,
110 .rcvdata = ng_eiface_rcvdata,
111 .disconnect = ng_eiface_disconnect,
112 .cmdlist = ng_eiface_cmdlist
114 NETGRAPH_INIT(eiface, &typestruct);
116 static struct unrhdr *ng_eiface_unit;
118 /************************************************************************
120 ************************************************************************/
123 * Process an ioctl for the virtual interface
126 ng_eiface_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
128 struct ifreq *const ifr = (struct ifreq *)data;
132 ng_eiface_print_ioctl(ifp, command, data);
137 /* These two are mostly handled at a higher layer */
139 error = ether_ioctl(ifp, command, data);
147 * If the interface is marked up and stopped, then start it.
148 * If it is marked down and running, then stop it.
150 if (ifr->ifr_flags & IFF_UP) {
151 if (!(ifp->if_flags & IFF_RUNNING)) {
152 ifp->if_flags &= ~(IFF_OACTIVE);
153 ifp->if_flags |= IFF_RUNNING;
156 if (ifp->if_flags & IFF_RUNNING)
157 ifp->if_flags &= ~(IFF_RUNNING | IFF_OACTIVE);
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->sc_ifp;
196 ifp->if_flags |= IFF_RUNNING;
197 ifp->if_flags &= ~IFF_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 */
216 if ((ifp->if_flags & (IFF_UP | IFF_RUNNING)) != (IFF_UP | IFF_RUNNING))
219 /* Don't do anything if output is active */
220 if (ifp->if_flags & IFF_OACTIVE)
223 ifp->if_flags |= IFF_OACTIVE;
226 * Grab a packet to transmit.
228 IF_DEQUEUE(&ifp->if_snd, m);
230 /* If there's nothing to send, return. */
232 ifp->if_flags &= ~IFF_OACTIVE;
237 * Berkeley packet filter.
238 * Pass packet to bpf if there is a listener.
239 * XXX is this safe? locking?
243 /* Copy length before the mbuf gets invalidated */
244 len = m->m_pkthdr.len;
247 * Send packet; if hook is not connected, mbuf will get
250 NG_SEND_DATA_ONLY(error, priv->ether, m);
254 ifp->if_obytes += len;
258 ifp->if_flags &= ~IFF_OACTIVE;
264 * This routine is called to deliver a packet out the interface.
265 * We simply queue the netgraph version to be called when netgraph locking
266 * allows it to happen.
267 * Until we know what the rest of the networking code is doing for
268 * locking, we don't know how we will interact with it.
269 * Take comfort from the fact that the ifnet struct is part of our
270 * private info and can't go away while we are queued.
271 * [Though we don't know it is still there now....]
272 * it is possible we don't gain anything from this because
273 * we would like to get the mbuf and queue it as data
274 * somehow, but we can't and if we did would we solve anything?
277 ng_eiface_start(struct ifnet *ifp)
280 const priv_p priv = (priv_p)ifp->if_softc;
282 ng_send_fn(priv->node, NULL, &ng_eiface_start2, ifp, 0);
287 * Display an ioctl to the virtual interface
291 ng_eiface_print_ioctl(struct ifnet *ifp, int command, caddr_t data)
295 switch (command & IOC_DIRMASK) {
311 log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n",
316 IOCPARM_LEN(command));
320 /************************************************************************
322 ************************************************************************/
325 * Constructor for a node
328 ng_eiface_constructor(node_p node)
333 /* Allocate node and interface private structures */
334 MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO);
338 ifp = &(priv->arpcom.ac_if);
340 /* Link them together */
341 ifp->if_softc = priv;
343 /* Get an interface unit number */
344 priv->unit = alloc_unr(ng_eiface_unit);
346 /* Link together node and private info */
347 NG_NODE_SET_PRIVATE(node, priv);
350 /* Initialize interface structure */
351 if_initname(ifp, NG_EIFACE_EIFACE_NAME, priv->unit);
352 ifp->if_init = ng_eiface_init;
353 ifp->if_output = ether_output;
354 ifp->if_start = ng_eiface_start;
355 ifp->if_ioctl = ng_eiface_ioctl;
356 ifp->if_watchdog = NULL;
357 ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;
358 ifp->if_flags = (IFF_SIMPLEX | IFF_BROADCAST | IFF_MULTICAST);
361 /* Give this node name */
362 bzero(ifname, sizeof(ifname));
363 sprintf(ifname, "if%s", ifp->if_xname);
364 (void)ng_name_node(node, ifname);
367 /* Attach the interface */
368 ether_ifattach(ifp, priv->arpcom.ac_enaddr);
375 * Give our ok for a hook to be added
378 ng_eiface_newhook(node_p node, hook_p hook, const char *name)
380 priv_p priv = NG_NODE_PRIVATE(node);
381 struct ifnet *ifp = &priv->sc_ifp;
383 if (strcmp(name, NG_EIFACE_HOOK_ETHER))
384 return (EPFNOSUPPORT);
385 if (priv->ether != NULL)
388 NG_HOOK_SET_PRIVATE(hook, &priv->ether);
390 if_link_state_change(ifp, LINK_STATE_UP);
396 * Receive a control message
399 ng_eiface_rcvmsg(node_p node, item_p item, hook_p lasthook)
401 const priv_p priv = NG_NODE_PRIVATE(node);
402 struct ifnet *const ifp = &priv->sc_ifp;
403 struct ng_mesg *resp = NULL;
407 NGI_GET_MSG(item, msg);
408 switch (msg->header.typecookie) {
409 case NGM_EIFACE_COOKIE:
410 switch (msg->header.cmd) {
414 struct ether_addr *eaddr;
416 struct sockaddr_dl *sdl;
418 if (msg->header.arglen != sizeof(struct ether_addr)) {
422 eaddr = (struct ether_addr *)(msg->data);
423 bcopy(eaddr, priv->arpcom.ac_enaddr, ETHER_ADDR_LEN);
425 /* And put it in the ifaddr list */
426 TAILQ_FOREACH(ifa, &(ifp->if_addrhead), ifa_link) {
427 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
428 if (sdl->sdl_type == IFT_ETHER) {
429 bcopy((IFP2AC(ifp))->ac_enaddr,
430 LLADDR(sdl), ifp->if_addrlen);
437 case NGM_EIFACE_GET_IFNAME:
438 NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_NOWAIT);
443 strlcpy(resp->data, ifp->if_xname, IFNAMSIZ);
446 case NGM_EIFACE_GET_IFADDRS:
452 #define SA_SIZE(s) ((s)->sa_len<sizeof(*(s))? sizeof(*(s)):(s)->sa_len)
454 /* Determine size of response and allocate it */
456 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
457 buflen += SA_SIZE(ifa->ifa_addr);
458 NG_MKRESPONSE(resp, msg, buflen, M_NOWAIT);
466 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
467 const int len = SA_SIZE(ifa->ifa_addr);
470 log(LOG_ERR, "%s: len changed?\n",
474 bcopy(ifa->ifa_addr, ptr, len);
485 } /* end of inner switch() */
487 case NGM_FLOW_COOKIE:
488 switch (msg->header.cmd) {
490 if_link_state_change(ifp, LINK_STATE_UP);
492 case NGM_LINK_IS_DOWN:
493 if_link_state_change(ifp, LINK_STATE_DOWN);
503 NG_RESPOND_MSG(error, node, item, resp);
509 * Receive data from a hook. Pass the packet to the ether_input routine.
512 ng_eiface_rcvdata(hook_p hook, item_p item)
514 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
515 struct ifnet *const ifp = &priv->sc_ifp;
521 if ((ifp->if_flags & (IFF_UP | IFF_RUNNING)) !=
522 (IFF_UP | IFF_RUNNING)) {
527 if (m->m_len < ETHER_HDR_LEN) {
528 m = m_pullup(m, ETHER_HDR_LEN);
533 /* Note receiving interface */
534 m->m_pkthdr.rcvif = ifp;
536 /* Update interface stats */
539 (*ifp->if_input)(ifp, m);
546 * Shutdown processing.
549 ng_eiface_rmnode(node_p node)
551 const priv_p priv = NG_NODE_PRIVATE(node);
552 struct ifnet *const ifp = &priv->sc_ifp;
555 free_unr(ng_eiface_unit, priv->unit);
556 FREE(priv, M_NETGRAPH);
557 NG_NODE_SET_PRIVATE(node, NULL);
566 ng_eiface_disconnect(hook_p hook)
568 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
575 * Handle loading and unloading for this node type.
578 ng_eiface_mod_event(module_t mod, int event, void *data)
584 ng_eiface_unit = new_unrhdr(0, 0xffff, NULL);
587 delete_unrhdr(ng_eiface_unit);