5 * Copyright (c) 1996-2000 Whistle Communications, Inc.
8 * Subject to the following obligations and disclaimer of warranty, use and
9 * redistribution of this software, in source or object code forms, with or
10 * without modifications are expressly permitted by Whistle Communications;
11 * provided, however, that:
12 * 1. Any and all reproductions of the source or object code must include the
13 * copyright notice above and the following disclaimer of warranties; and
14 * 2. No rights are granted, in any manner or form, to use Whistle
15 * Communications, Inc. trademarks, including the mark "WHISTLE
16 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as
17 * such appears in the above copyright notice or in the software.
19 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
20 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
21 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
22 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
23 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
24 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
25 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
26 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
27 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
28 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
29 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
30 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
31 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
32 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
33 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
34 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
37 * Authors: Archie Cobbs <archie@freebsd.org>
38 * Julian Elischer <julian@freebsd.org>
40 * $FreeBSD: src/sys/netgraph/ng_ether.c,v 1.2.2.13 2002/07/02 20:10:25 archie Exp $
44 * ng_ether(4) netgraph node type
47 #include <sys/param.h>
48 #include <sys/systm.h>
49 #include <sys/kernel.h>
50 #include <sys/malloc.h>
52 #include <sys/errno.h>
53 #include <sys/syslog.h>
54 #include <sys/socket.h>
57 #include <net/if_types.h>
58 #include <net/if_arp.h>
59 #include <net/if_var.h>
60 #include <net/ethernet.h>
62 #include <netgraph/ng_message.h>
63 #include <netgraph/netgraph.h>
64 #include <netgraph/ng_parse.h>
65 #include <netgraph/ng_ether.h>
67 #define IFP2AC(IFP) ((struct arpcom *)IFP)
68 #define IFP2NG(ifp) ((struct ng_node *)((struct arpcom *)(ifp))->ac_netgraph)
70 /* Per-node private data */
72 struct ifnet *ifp; /* associated interface */
73 hook_p upper; /* upper hook connection */
74 hook_p lower; /* lower OR orphan hook connection */
75 u_char lowerOrphan; /* whether lower is lower or orphan */
76 u_char autoSrcAddr; /* always overwrite source address */
77 u_char promisc; /* promiscuous mode enabled */
78 u_long hwassist; /* hardware checksum capabilities */
80 typedef struct private *priv_p;
82 /* Functional hooks called from if_ethersubr.c */
83 static void ng_ether_input(struct ifnet *ifp,
84 struct mbuf **mp, struct ether_header *eh);
85 static void ng_ether_input_orphan(struct ifnet *ifp,
86 struct mbuf *m, struct ether_header *eh);
87 static int ng_ether_output(struct ifnet *ifp, struct mbuf **mp);
88 static void ng_ether_attach(struct ifnet *ifp);
89 static void ng_ether_detach(struct ifnet *ifp);
92 static void ng_ether_input2(node_p node,
93 struct mbuf **mp, struct ether_header *eh);
94 static int ng_ether_glueback_header(struct mbuf **mp,
95 struct ether_header *eh);
96 static int ng_ether_rcv_lower(node_p node, struct mbuf *m, meta_p meta);
97 static int ng_ether_rcv_upper(node_p node, struct mbuf *m, meta_p meta);
99 /* Netgraph node methods */
100 static ng_constructor_t ng_ether_constructor;
101 static ng_rcvmsg_t ng_ether_rcvmsg;
102 static ng_shutdown_t ng_ether_rmnode;
103 static ng_newhook_t ng_ether_newhook;
104 static ng_rcvdata_t ng_ether_rcvdata;
105 static ng_disconnect_t ng_ether_disconnect;
106 static int ng_ether_mod_event(module_t mod, int event, void *data);
108 /* Parse type for an Ethernet address */
109 static ng_parse_t ng_enaddr_parse;
110 static ng_unparse_t ng_enaddr_unparse;
111 const struct ng_parse_type ng_ether_enaddr_type = {
117 NULL, /* no such thing as a "default" EN address */
121 /* List of commands and how to convert arguments to/from ASCII */
122 static const struct ng_cmdlist ng_ether_cmdlist[] = {
125 NGM_ETHER_GET_IFNAME,
128 &ng_parse_string_type
132 NGM_ETHER_GET_IFINDEX,
139 NGM_ETHER_GET_ENADDR,
142 &ng_ether_enaddr_type
146 NGM_ETHER_SET_ENADDR,
148 &ng_ether_enaddr_type,
153 NGM_ETHER_GET_PROMISC,
160 NGM_ETHER_SET_PROMISC,
162 &ng_parse_int32_type,
167 NGM_ETHER_GET_AUTOSRC,
174 NGM_ETHER_SET_AUTOSRC,
176 &ng_parse_int32_type,
182 static struct ng_type ng_ether_typestruct = {
186 ng_ether_constructor,
197 NETGRAPH_INIT(ether, &ng_ether_typestruct);
199 /******************************************************************
200 ETHERNET FUNCTION HOOKS
201 ******************************************************************/
204 * Handle a packet that has come in on an interface. We get to
205 * look at it here before any upper layer protocols do.
207 * NOTE: this function will get called at splimp()
210 ng_ether_input(struct ifnet *ifp,
211 struct mbuf **mp, struct ether_header *eh)
213 const node_p node = IFP2NG(ifp);
214 const priv_p priv = node->private;
216 /* If "lower" hook not connected, let packet continue */
217 if (priv->lower == NULL || priv->lowerOrphan)
219 ng_ether_input2(node, mp, eh);
223 * Handle a packet that has come in on an interface, and which
224 * does not match any of our known protocols (an ``orphan'').
226 * NOTE: this function will get called at splimp()
229 ng_ether_input_orphan(struct ifnet *ifp,
230 struct mbuf *m, struct ether_header *eh)
232 const node_p node = IFP2NG(ifp);
233 const priv_p priv = node->private;
235 /* If "orphan" hook not connected, let packet continue */
236 if (priv->lower == NULL || !priv->lowerOrphan) {
240 ng_ether_input2(node, &m, eh);
246 * Handle a packet that has come in on an interface.
247 * The Ethernet header has already been detached from the mbuf,
248 * so we have to put it back.
250 * NOTE: this function will get called at splimp()
253 ng_ether_input2(node_p node, struct mbuf **mp, struct ether_header *eh)
255 const priv_p priv = node->private;
259 /* Glue Ethernet header back on */
260 if ((error = ng_ether_glueback_header(mp, eh)) != 0)
263 /* Send out lower/orphan hook */
264 (void)ng_queue_data(priv->lower, *mp, meta);
269 * Handle a packet that is going out on an interface.
270 * The Ethernet header is already attached to the mbuf.
273 ng_ether_output(struct ifnet *ifp, struct mbuf **mp)
275 const node_p node = IFP2NG(ifp);
276 const priv_p priv = node->private;
280 /* If "upper" hook not connected, let packet continue */
281 if (priv->upper == NULL)
284 /* Send it out "upper" hook */
285 NG_SEND_DATA(error, priv->upper, *mp, meta);
291 * A new Ethernet interface has been attached.
292 * Create a new node for it, etc.
295 ng_ether_attach(struct ifnet *ifp)
297 char name[IFNAMSIZ + 1];
302 KASSERT(!IFP2NG(ifp), ("%s: node already exists?", __FUNCTION__));
303 snprintf(name, sizeof(name), "%s%d", ifp->if_name, ifp->if_unit);
304 if (ng_make_node_common(&ng_ether_typestruct, &node) != 0) {
305 log(LOG_ERR, "%s: can't %s for %s\n",
306 __FUNCTION__, "create node", name);
310 /* Allocate private data */
311 MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_NOWAIT);
313 log(LOG_ERR, "%s: can't %s for %s\n",
314 __FUNCTION__, "allocate memory", name);
318 bzero(priv, sizeof(*priv));
319 node->private = priv;
322 priv->autoSrcAddr = 1;
323 priv->hwassist = ifp->if_hwassist;
325 /* Try to give the node the same name as the interface */
326 if (ng_name_node(node, name) != 0) {
327 log(LOG_WARNING, "%s: can't name node %s\n",
333 * An Ethernet interface is being detached.
337 ng_ether_detach(struct ifnet *ifp)
339 const node_p node = IFP2NG(ifp);
342 if (node == NULL) /* no node (why not?), ignore */
344 ng_rmnode(node); /* break all links to other nodes */
345 node->flags |= NG_INVALID;
346 ng_unname(node); /* free name (and its reference) */
347 IFP2NG(ifp) = NULL; /* detach node from interface */
348 priv = node->private; /* free node private info */
349 bzero(priv, sizeof(*priv));
350 FREE(priv, M_NETGRAPH);
351 node->private = NULL;
352 ng_unref(node); /* free node itself */
356 * Optimization for gluing the Ethernet header back onto
357 * the front of an incoming packet.
360 ng_ether_glueback_header(struct mbuf **mp, struct ether_header *eh)
362 struct mbuf *m = *mp;
366 * Optimize for the case where the header is already in place
367 * at the front of the mbuf. This is actually quite likely
368 * because many Ethernet drivers generate packets this way.
370 if (eh == mtod(m, struct ether_header *) - 1) {
371 m->m_len += sizeof(*eh);
372 m->m_data -= sizeof(*eh);
373 m->m_pkthdr.len += sizeof(*eh);
377 /* Prepend the header back onto the front of the mbuf */
378 M_PREPEND(m, sizeof(*eh), M_DONTWAIT);
384 /* Copy header into front of mbuf */
385 bcopy(eh, mtod(m, void *), sizeof(*eh));
393 /******************************************************************
394 NETGRAPH NODE METHODS
395 ******************************************************************/
398 * It is not possible or allowable to create a node of this type.
399 * Nodes get created when the interface is attached (or, when
400 * this node type's KLD is loaded).
403 ng_ether_constructor(node_p *nodep)
409 * Check for attaching a new hook.
412 ng_ether_newhook(node_p node, hook_p hook, const char *name)
414 const priv_p priv = node->private;
415 u_char orphan = priv->lowerOrphan;
418 /* Divert hook is an alias for lower */
419 if (strcmp(name, NG_ETHER_HOOK_DIVERT) == 0)
420 name = NG_ETHER_HOOK_LOWER;
423 if (strcmp(name, NG_ETHER_HOOK_UPPER) == 0)
424 hookptr = &priv->upper;
425 else if (strcmp(name, NG_ETHER_HOOK_LOWER) == 0) {
426 hookptr = &priv->lower;
428 } else if (strcmp(name, NG_ETHER_HOOK_ORPHAN) == 0) {
429 hookptr = &priv->lower;
434 /* Check if already connected (shouldn't be, but doesn't hurt) */
435 if (*hookptr != NULL)
438 /* Disable hardware checksums while 'upper' hook is connected */
439 if (hookptr == &priv->upper)
440 priv->ifp->if_hwassist = 0;
444 priv->lowerOrphan = orphan;
449 * Receive an incoming control message.
452 ng_ether_rcvmsg(node_p node, struct ng_mesg *msg,
453 const char *retaddr, struct ng_mesg **rptr)
455 const priv_p priv = node->private;
456 struct ng_mesg *resp = NULL;
459 switch (msg->header.typecookie) {
460 case NGM_ETHER_COOKIE:
461 switch (msg->header.cmd) {
462 case NGM_ETHER_GET_IFNAME:
463 NG_MKRESPONSE(resp, msg, IFNAMSIZ + 1, M_NOWAIT);
468 snprintf(resp->data, IFNAMSIZ + 1,
469 "%s%d", priv->ifp->if_name, priv->ifp->if_unit);
471 case NGM_ETHER_GET_IFINDEX:
472 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
477 *((u_int32_t *)resp->data) = priv->ifp->if_index;
479 case NGM_ETHER_GET_ENADDR:
480 NG_MKRESPONSE(resp, msg, ETHER_ADDR_LEN, M_NOWAIT);
485 bcopy((IFP2AC(priv->ifp))->ac_enaddr,
486 resp->data, ETHER_ADDR_LEN);
488 case NGM_ETHER_SET_ENADDR:
490 if (msg->header.arglen != ETHER_ADDR_LEN) {
494 error = if_setlladdr(priv->ifp,
495 (u_char *)msg->data, ETHER_ADDR_LEN);
498 case NGM_ETHER_GET_PROMISC:
499 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
504 *((u_int32_t *)resp->data) = priv->promisc;
506 case NGM_ETHER_SET_PROMISC:
510 if (msg->header.arglen != sizeof(u_int32_t)) {
514 want = !!*((u_int32_t *)msg->data);
515 if (want ^ priv->promisc) {
516 if ((error = ifpromisc(priv->ifp, want)) != 0)
518 priv->promisc = want;
522 case NGM_ETHER_GET_AUTOSRC:
523 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
528 *((u_int32_t *)resp->data) = priv->autoSrcAddr;
530 case NGM_ETHER_SET_AUTOSRC:
531 if (msg->header.arglen != sizeof(u_int32_t)) {
535 priv->autoSrcAddr = !!*((u_int32_t *)msg->data);
548 else if (resp != NULL)
549 FREE(resp, M_NETGRAPH);
550 FREE(msg, M_NETGRAPH);
555 * Receive data on a hook.
558 ng_ether_rcvdata(hook_p hook, struct mbuf *m, meta_p meta)
560 const node_p node = hook->node;
561 const priv_p priv = node->private;
563 if (hook == priv->lower)
564 return ng_ether_rcv_lower(node, m, meta);
565 if (hook == priv->upper)
566 return ng_ether_rcv_upper(node, m, meta);
567 panic("%s: weird hook", __FUNCTION__);
571 * Handle an mbuf received on the "lower" hook.
574 ng_ether_rcv_lower(node_p node, struct mbuf *m, meta_p meta)
576 const priv_p priv = node->private;
577 struct ifnet *const ifp = priv->ifp;
579 /* Discard meta info */
582 /* Check whether interface is ready for packets */
583 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) {
588 /* Make sure header is fully pulled up */
589 if (m->m_pkthdr.len < sizeof(struct ether_header)) {
593 if (m->m_len < sizeof(struct ether_header)
594 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL)
597 /* Drop in the MAC address if desired */
598 if (priv->autoSrcAddr) {
600 /* Make the mbuf writable if it's not already */
602 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL)
605 /* Overwrite source MAC address */
606 bcopy((IFP2AC(ifp))->ac_enaddr,
607 mtod(m, struct ether_header *)->ether_shost,
611 /* Send it on its way */
612 return ether_output_frame(ifp, m);
616 * Handle an mbuf received on the "upper" hook.
619 ng_ether_rcv_upper(node_p node, struct mbuf *m, meta_p meta)
621 const priv_p priv = node->private;
622 struct ether_header *eh;
624 /* Discard meta info */
627 /* Check length and pull off header */
628 if (m->m_pkthdr.len < sizeof(*eh)) {
632 if (m->m_len < sizeof(*eh) && (m = m_pullup(m, sizeof(*eh))) == NULL)
634 eh = mtod(m, struct ether_header *);
635 m->m_data += sizeof(*eh);
636 m->m_len -= sizeof(*eh);
637 m->m_pkthdr.len -= sizeof(*eh);
638 m->m_pkthdr.rcvif = priv->ifp;
640 /* Route packet back in */
641 ether_demux(priv->ifp, eh, m);
646 * Shutdown node. This resets the node but does not remove it.
649 ng_ether_rmnode(node_p node)
651 const priv_p priv = node->private;
654 node->flags &= ~NG_INVALID; /* bounce back to life */
655 if (priv->promisc) { /* disable promiscuous mode */
656 (void)ifpromisc(priv->ifp, 0);
659 priv->autoSrcAddr = 1; /* reset auto-src-addr flag */
664 * Hook disconnection.
667 ng_ether_disconnect(hook_p hook)
669 const priv_p priv = hook->node->private;
671 if (hook == priv->upper) {
673 priv->ifp->if_hwassist = priv->hwassist; /* restore h/w csum */
674 } else if (hook == priv->lower) {
676 priv->lowerOrphan = 0;
678 panic("%s: weird hook", __FUNCTION__);
679 if (hook->node->numhooks == 0)
680 ng_rmnode(hook->node); /* reset node */
685 ng_enaddr_parse(const struct ng_parse_type *type,
686 const char *s, int *const off, const u_char *const start,
687 u_char *const buf, int *const buflen)
693 if (*buflen < ETHER_ADDR_LEN)
695 for (i = 0; i < ETHER_ADDR_LEN; i++) {
696 val = strtoul(s + *off, &eptr, 16);
697 if (val > 0xff || eptr == s + *off)
699 buf[i] = (u_char)val;
701 if (i < ETHER_ADDR_LEN - 1) {
707 *buflen = ETHER_ADDR_LEN;
712 ng_enaddr_unparse(const struct ng_parse_type *type,
713 const u_char *data, int *off, char *cbuf, int cbuflen)
717 len = snprintf(cbuf, cbuflen, "%02x:%02x:%02x:%02x:%02x:%02x",
718 data[*off], data[*off + 1], data[*off + 2],
719 data[*off + 3], data[*off + 4], data[*off + 5]);
722 *off += ETHER_ADDR_LEN;
726 /******************************************************************
728 ******************************************************************/
731 * Handle loading and unloading for this node type.
734 ng_ether_mod_event(module_t mod, int event, void *data)
744 /* Register function hooks */
745 if (ng_ether_attach_p != NULL) {
749 ng_ether_attach_p = ng_ether_attach;
750 ng_ether_detach_p = ng_ether_detach;
751 ng_ether_output_p = ng_ether_output;
752 ng_ether_input_p = ng_ether_input;
753 ng_ether_input_orphan_p = ng_ether_input_orphan;
755 /* Create nodes for any already-existing Ethernet interfaces */
756 TAILQ_FOREACH(ifp, &ifnet, if_link) {
757 if (ifp->if_type == IFT_ETHER ||
758 ifp->if_type == IFT_L2VLAN)
759 ng_ether_attach(ifp);
766 * Note that the base code won't try to unload us until
767 * all nodes have been removed, and that can't happen
768 * until all Ethernet interfaces are removed. In any
769 * case, we know there are no nodes left if the action
770 * is MOD_UNLOAD, so there's no need to detach any nodes.
773 /* Unregister function hooks */
774 ng_ether_attach_p = NULL;
775 ng_ether_detach_p = NULL;
776 ng_ether_output_p = NULL;
777 ng_ether_input_p = NULL;
778 ng_ether_input_orphan_p = NULL;