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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 $
41 * $DragonFly: src/sys/netgraph/ether/ng_ether.c,v 1.17 2008/07/27 10:06:57 sephe Exp $
45 * ng_ether(4) netgraph node type
48 #include <sys/param.h>
49 #include <sys/systm.h>
50 #include <sys/kernel.h>
51 #include <sys/malloc.h>
53 #include <sys/errno.h>
54 #include <sys/syslog.h>
55 #include <sys/socket.h>
56 #include <sys/thread2.h>
59 #include <net/if_types.h>
60 #include <net/if_arp.h>
61 #include <net/if_var.h>
62 #include <net/ethernet.h>
64 #include <netgraph/ng_message.h>
65 #include <netgraph/netgraph.h>
66 #include <netgraph/ng_parse.h>
69 #define IFP2AC(IFP) ((struct arpcom *)IFP)
70 #define IFP2NG(ifp) (IFP2AC((ifp))->ac_netgraph)
72 /* Per-node private data */
74 struct ifnet *ifp; /* associated interface */
75 hook_p upper; /* upper hook connection */
76 hook_p lower; /* lower OR orphan hook connection */
77 u_char lowerOrphan; /* whether lower is lower or orphan */
78 u_char autoSrcAddr; /* always overwrite source address */
79 u_char promisc; /* promiscuous mode enabled */
80 u_long hwassist; /* hardware checksum capabilities */
82 typedef struct private *priv_p;
84 /* Functional hooks called from if_ethersubr.c */
85 static void ng_ether_input(struct ifnet *ifp, struct mbuf **mp);
86 static void ng_ether_input_orphan(struct ifnet *ifp,
87 struct mbuf *m, const struct ether_header *eh);
88 static int ng_ether_output(struct ifnet *ifp, struct mbuf **mp);
89 static void ng_ether_attach(struct ifnet *ifp);
90 static void ng_ether_detach(struct ifnet *ifp);
93 static void ng_ether_input2(node_p node,
94 struct mbuf **mp, const struct ether_header *eh);
95 static int ng_ether_glueback_header(struct mbuf **mp,
96 const struct ether_header *eh);
97 static int ng_ether_rcv_lower(node_p node, struct mbuf *m, meta_p meta);
98 static int ng_ether_rcv_upper(node_p node, struct mbuf *m, meta_p meta);
100 /* Netgraph node methods */
101 static ng_constructor_t ng_ether_constructor;
102 static ng_rcvmsg_t ng_ether_rcvmsg;
103 static ng_shutdown_t ng_ether_rmnode;
104 static ng_newhook_t ng_ether_newhook;
105 static ng_rcvdata_t ng_ether_rcvdata;
106 static ng_disconnect_t ng_ether_disconnect;
107 static int ng_ether_mod_event(module_t mod, int event, void *data);
109 /* Parse type for an Ethernet address */
110 static ng_parse_t ng_enaddr_parse;
111 static ng_unparse_t ng_enaddr_unparse;
112 const struct ng_parse_type ng_ether_enaddr_type = {
118 NULL, /* no such thing as a "default" EN address */
122 /* List of commands and how to convert arguments to/from ASCII */
123 static const struct ng_cmdlist ng_ether_cmdlist[] = {
126 NGM_ETHER_GET_IFNAME,
129 &ng_parse_string_type
133 NGM_ETHER_GET_IFINDEX,
140 NGM_ETHER_GET_ENADDR,
143 &ng_ether_enaddr_type
147 NGM_ETHER_SET_ENADDR,
149 &ng_ether_enaddr_type,
154 NGM_ETHER_GET_PROMISC,
161 NGM_ETHER_SET_PROMISC,
163 &ng_parse_int32_type,
168 NGM_ETHER_GET_AUTOSRC,
175 NGM_ETHER_SET_AUTOSRC,
177 &ng_parse_int32_type,
183 static struct ng_type ng_ether_typestruct = {
187 ng_ether_constructor,
198 NETGRAPH_INIT(ether, &ng_ether_typestruct);
200 /******************************************************************
201 ETHERNET FUNCTION HOOKS
202 ******************************************************************/
205 * Handle a packet that has come in on an interface. We get to
206 * look at it here before any upper layer protocols do.
209 ng_ether_input(struct ifnet *ifp, struct mbuf **mp)
211 const node_p node = IFP2NG(ifp);
212 const priv_p priv = node->private;
214 /* If "lower" hook not connected, let packet continue */
215 if (priv->lower == NULL || priv->lowerOrphan)
217 ng_ether_input2(node, mp, NULL);
221 * Handle a packet that has come in on an interface, and which
222 * does not match any of our known protocols (an ``orphan'').
225 ng_ether_input_orphan(struct ifnet *ifp,
226 struct mbuf *m, const struct ether_header *eh)
228 const node_p node = IFP2NG(ifp);
229 const priv_p priv = node->private;
231 /* If "orphan" hook not connected, let packet continue */
232 if (priv->lower == NULL || !priv->lowerOrphan) {
236 ng_ether_input2(node, &m, eh);
242 * Handle a packet that has come in on an interface.
243 * The Ethernet header has already been detached from the mbuf,
244 * so we have to put it back.
246 * NOTE: this function will get called at splimp()
249 ng_ether_input2(node_p node, struct mbuf **mp, const struct ether_header *eh)
251 const priv_p priv = node->private;
255 /* Glue Ethernet header back on */
256 if (eh != NULL && (error = ng_ether_glueback_header(mp, eh)) != 0)
259 /* Send out lower/orphan hook */
260 ng_queue_data(priv->lower, *mp, meta);
265 * Handle a packet that is going out on an interface.
266 * The Ethernet header is already attached to the mbuf.
269 ng_ether_output(struct ifnet *ifp, struct mbuf **mp)
271 const node_p node = IFP2NG(ifp);
272 const priv_p priv = node->private;
276 /* If "upper" hook not connected, let packet continue */
277 if (priv->upper == NULL)
280 /* Send it out "upper" hook */
281 NG_SEND_DATA(error, priv->upper, *mp, meta);
287 * A new Ethernet interface has been attached.
288 * Create a new node for it, etc.
291 ng_ether_attach(struct ifnet *ifp)
293 char name[IFNAMSIZ + 1];
298 KASSERT(!IFP2NG(ifp), ("%s: node already exists?", __func__));
299 strlcpy(name, ifp->if_xname, sizeof(name));
300 if (ng_make_node_common(&ng_ether_typestruct, &node) != 0) {
301 log(LOG_ERR, "%s: can't %s for %s\n",
302 __func__, "create node", name);
306 /* Allocate private data */
307 MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO);
309 log(LOG_ERR, "%s: can't %s for %s\n",
310 __func__, "allocate memory", name);
314 node->private = priv;
317 priv->autoSrcAddr = 1;
318 priv->hwassist = ifp->if_hwassist;
320 /* Try to give the node the same name as the interface */
321 if (ng_name_node(node, name) != 0) {
322 log(LOG_WARNING, "%s: can't name node %s\n",
328 * An Ethernet interface is being detached.
332 ng_ether_detach(struct ifnet *ifp)
334 const node_p node = IFP2NG(ifp);
337 if (node == NULL) /* no node (why not?), ignore */
339 ng_rmnode(node); /* break all links to other nodes */
340 node->flags |= NG_INVALID;
341 ng_unname(node); /* free name (and its reference) */
342 IFP2NG(ifp) = NULL; /* detach node from interface */
343 priv = node->private; /* free node private info */
344 bzero(priv, sizeof(*priv));
345 FREE(priv, M_NETGRAPH);
346 node->private = NULL;
347 ng_unref(node); /* free node itself */
351 * Optimization for gluing the Ethernet header back onto
352 * the front of an incoming packet.
355 ng_ether_glueback_header(struct mbuf **mp, const struct ether_header *eh)
357 struct mbuf *m = *mp;
361 * Optimize for the case where the header is already in place
362 * at the front of the mbuf. This is actually quite likely
363 * because many Ethernet drivers generate packets this way.
365 if (eh == mtod(m, struct ether_header *) - 1) {
366 m->m_len += sizeof(*eh);
367 m->m_data -= sizeof(*eh);
368 m->m_pkthdr.len += sizeof(*eh);
372 /* Prepend the header back onto the front of the mbuf */
373 M_PREPEND(m, sizeof(*eh), MB_DONTWAIT);
379 /* Copy header into front of mbuf */
380 bcopy(eh, mtod(m, void *), sizeof(*eh));
388 /******************************************************************
389 NETGRAPH NODE METHODS
390 ******************************************************************/
393 * It is not possible or allowable to create a node of this type.
394 * Nodes get created when the interface is attached (or, when
395 * this node type's KLD is loaded).
398 ng_ether_constructor(node_p *nodep)
404 * Check for attaching a new hook.
407 ng_ether_newhook(node_p node, hook_p hook, const char *name)
409 const priv_p priv = node->private;
410 u_char orphan = priv->lowerOrphan;
413 /* Divert hook is an alias for lower */
414 if (strcmp(name, NG_ETHER_HOOK_DIVERT) == 0)
415 name = NG_ETHER_HOOK_LOWER;
418 if (strcmp(name, NG_ETHER_HOOK_UPPER) == 0)
419 hookptr = &priv->upper;
420 else if (strcmp(name, NG_ETHER_HOOK_LOWER) == 0) {
421 hookptr = &priv->lower;
423 } else if (strcmp(name, NG_ETHER_HOOK_ORPHAN) == 0) {
424 hookptr = &priv->lower;
429 /* Check if already connected (shouldn't be, but doesn't hurt) */
430 if (*hookptr != NULL)
433 /* Disable hardware checksums while 'upper' hook is connected */
434 if (hookptr == &priv->upper)
435 priv->ifp->if_hwassist = 0;
439 priv->lowerOrphan = orphan;
444 * Receive an incoming control message.
447 ng_ether_rcvmsg(node_p node, struct ng_mesg *msg,
448 const char *retaddr, struct ng_mesg **rptr)
450 const priv_p priv = node->private;
451 struct ng_mesg *resp = NULL;
454 switch (msg->header.typecookie) {
455 case NGM_ETHER_COOKIE:
456 switch (msg->header.cmd) {
457 case NGM_ETHER_GET_IFNAME:
458 NG_MKRESPONSE(resp, msg, IFNAMSIZ + 1, M_NOWAIT);
463 strlcpy(resp->data, priv->ifp->if_xname, IFNAMSIZ);
465 case NGM_ETHER_GET_IFINDEX:
466 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
471 *((u_int32_t *)resp->data) = priv->ifp->if_index;
473 case NGM_ETHER_GET_ENADDR:
474 NG_MKRESPONSE(resp, msg, ETHER_ADDR_LEN, M_NOWAIT);
479 bcopy((IFP2AC(priv->ifp))->ac_enaddr,
480 resp->data, ETHER_ADDR_LEN);
482 case NGM_ETHER_SET_ENADDR:
484 if (msg->header.arglen != ETHER_ADDR_LEN) {
488 error = if_setlladdr(priv->ifp,
489 (u_char *)msg->data, ETHER_ADDR_LEN);
492 case NGM_ETHER_GET_PROMISC:
493 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
498 *((u_int32_t *)resp->data) = priv->promisc;
500 case NGM_ETHER_SET_PROMISC:
504 if (msg->header.arglen != sizeof(u_int32_t)) {
508 want = !!*((u_int32_t *)msg->data);
509 if (want ^ priv->promisc) {
510 if ((error = ifpromisc(priv->ifp, want)) != 0)
512 priv->promisc = want;
516 case NGM_ETHER_GET_AUTOSRC:
517 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
522 *((u_int32_t *)resp->data) = priv->autoSrcAddr;
524 case NGM_ETHER_SET_AUTOSRC:
525 if (msg->header.arglen != sizeof(u_int32_t)) {
529 priv->autoSrcAddr = !!*((u_int32_t *)msg->data);
542 else if (resp != NULL)
543 FREE(resp, M_NETGRAPH);
544 FREE(msg, M_NETGRAPH);
549 * Receive data on a hook.
552 ng_ether_rcvdata(hook_p hook, struct mbuf *m, meta_p meta)
554 const node_p node = hook->node;
555 const priv_p priv = node->private;
557 if (hook == priv->lower)
558 return ng_ether_rcv_lower(node, m, meta);
559 if (hook == priv->upper)
560 return ng_ether_rcv_upper(node, m, meta);
561 panic("%s: weird hook", __func__);
565 * Handle an mbuf received on the "lower" hook.
568 ng_ether_rcv_lower(node_p node, struct mbuf *m, meta_p meta)
570 const priv_p priv = node->private;
571 struct ifnet *const ifp = priv->ifp;
574 /* Discard meta info */
577 /* Check whether interface is ready for packets */
578 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) {
583 /* Make sure header is fully pulled up */
584 if (m->m_pkthdr.len < sizeof(struct ether_header)) {
588 if (m->m_len < sizeof(struct ether_header)
589 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL)
592 /* Drop in the MAC address if desired */
593 if (priv->autoSrcAddr) {
595 /* Make the mbuf writable if it's not already */
597 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL)
600 /* Overwrite source MAC address */
601 bcopy((IFP2AC(ifp))->ac_enaddr,
602 mtod(m, struct ether_header *)->ether_shost,
606 /* Send it on its way */
607 error = ether_output_frame(ifp, m);
612 * Handle an mbuf received on the "upper" hook.
615 ng_ether_rcv_upper(node_p node, struct mbuf *m, meta_p meta)
617 const priv_p priv = node->private;
619 /* Discard meta info */
622 /* Check length and pull off header */
623 if (m->m_pkthdr.len < ETHER_HDR_LEN) {
627 if (m->m_len < ETHER_HDR_LEN &&
628 (m = m_pullup(m, ETHER_HDR_LEN)) == NULL)
631 m->m_pkthdr.rcvif = priv->ifp;
633 /* Route packet back in */
639 * Shutdown node. This resets the node but does not remove it.
642 ng_ether_rmnode(node_p node)
644 const priv_p priv = node->private;
647 node->flags &= ~NG_INVALID; /* bounce back to life */
648 if (priv->promisc) { /* disable promiscuous mode */
649 ifpromisc(priv->ifp, 0);
652 priv->autoSrcAddr = 1; /* reset auto-src-addr flag */
657 * Hook disconnection.
660 ng_ether_disconnect(hook_p hook)
662 const priv_p priv = hook->node->private;
664 if (hook == priv->upper) {
666 priv->ifp->if_hwassist = priv->hwassist; /* restore h/w csum */
667 } else if (hook == priv->lower) {
669 priv->lowerOrphan = 0;
671 panic("%s: weird hook", __func__);
672 if (hook->node->numhooks == 0)
673 ng_rmnode(hook->node); /* reset node */
678 ng_enaddr_parse(const struct ng_parse_type *type,
679 const char *s, int *const off, const u_char *const start,
680 u_char *const buf, int *const buflen)
686 if (*buflen < ETHER_ADDR_LEN)
688 for (i = 0; i < ETHER_ADDR_LEN; i++) {
689 val = strtoul(s + *off, &eptr, 16);
690 if (val > 0xff || eptr == s + *off)
692 buf[i] = (u_char)val;
694 if (i < ETHER_ADDR_LEN - 1) {
700 *buflen = ETHER_ADDR_LEN;
705 ng_enaddr_unparse(const struct ng_parse_type *type,
706 const u_char *data, int *off, char *cbuf, int cbuflen)
710 len = ksnprintf(cbuf, cbuflen, "%02x:%02x:%02x:%02x:%02x:%02x",
711 data[*off], data[*off + 1], data[*off + 2],
712 data[*off + 3], data[*off + 4], data[*off + 5]);
715 *off += ETHER_ADDR_LEN;
719 /******************************************************************
721 ******************************************************************/
724 * Handle loading and unloading for this node type.
727 ng_ether_mod_event(module_t mod, int event, void *data)
736 /* Register function hooks */
737 if (ng_ether_attach_p != NULL) {
741 ng_ether_attach_p = ng_ether_attach;
742 ng_ether_detach_p = ng_ether_detach;
743 ng_ether_output_p = ng_ether_output;
744 ng_ether_input_p = ng_ether_input;
745 ng_ether_input_orphan_p = ng_ether_input_orphan;
747 /* Create nodes for any already-existing Ethernet interfaces */
748 TAILQ_FOREACH(ifp, &ifnet, if_link) {
749 if (ifp->if_type == IFT_ETHER ||
750 ifp->if_type == IFT_L2VLAN)
751 ng_ether_attach(ifp);
758 * Note that the base code won't try to unload us until
759 * all nodes have been removed, and that can't happen
760 * until all Ethernet interfaces are removed. In any
761 * case, we know there are no nodes left if the action
762 * is MOD_UNLOAD, so there's no need to detach any nodes.
765 /* Unregister function hooks */
766 ng_ether_attach_p = NULL;
767 ng_ether_detach_p = NULL;
768 ng_ether_output_p = NULL;
769 ng_ether_input_p = NULL;
770 ng_ether_input_orphan_p = NULL;