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39 * Authors: Archie Cobbs <archie@freebsd.org>
40 * Julian Elischer <julian@freebsd.org>
46 * ng_ether(4) netgraph node type
49 #include <sys/param.h>
50 #include <sys/systm.h>
51 #include <sys/kernel.h>
52 #include <sys/malloc.h>
54 #include <sys/errno.h>
56 #include <sys/syslog.h>
57 #include <sys/socket.h>
60 #include <net/if_dl.h>
61 #include <net/if_types.h>
62 #include <net/if_arp.h>
63 #include <net/if_var.h>
64 #include <net/ethernet.h>
65 #include <net/if_bridgevar.h>
68 #include <netgraph/ng_message.h>
69 #include <netgraph/netgraph.h>
70 #include <netgraph/ng_parse.h>
71 #include <netgraph/ng_ether.h>
73 #define IFP2NG(ifp) (IFP2AC((ifp))->ac_netgraph)
75 /* Per-node private data */
77 struct ifnet *ifp; /* associated interface */
78 hook_p upper; /* upper hook connection */
79 hook_p lower; /* lower hook connection */
80 hook_p orphan; /* orphan hook connection */
81 u_char autoSrcAddr; /* always overwrite source address */
82 u_char promisc; /* promiscuous mode enabled */
83 u_long hwassist; /* hardware checksum capabilities */
84 u_int flags; /* flags e.g. really die */
86 typedef struct private *priv_p;
88 /* Hook pointers used by if_ethersubr.c to callback to netgraph */
89 extern void (*ng_ether_input_p)(struct ifnet *ifp, struct mbuf **mp);
90 extern void (*ng_ether_input_orphan_p)(struct ifnet *ifp, struct mbuf *m);
91 extern int (*ng_ether_output_p)(struct ifnet *ifp, struct mbuf **mp);
92 extern void (*ng_ether_attach_p)(struct ifnet *ifp);
93 extern void (*ng_ether_detach_p)(struct ifnet *ifp);
94 extern void (*ng_ether_link_state_p)(struct ifnet *ifp, int state);
96 /* Functional hooks called from if_ethersubr.c */
97 static void ng_ether_input(struct ifnet *ifp, struct mbuf **mp);
98 static void ng_ether_input_orphan(struct ifnet *ifp, struct mbuf *m);
99 static int ng_ether_output(struct ifnet *ifp, struct mbuf **mp);
100 static void ng_ether_attach(struct ifnet *ifp);
101 static void ng_ether_detach(struct ifnet *ifp);
102 static void ng_ether_link_state(struct ifnet *ifp, int state);
104 /* Other functions */
105 static int ng_ether_rcv_lower(hook_p node, item_p item);
106 static int ng_ether_rcv_upper(hook_p node, item_p item);
108 /* Netgraph node methods */
109 static ng_constructor_t ng_ether_constructor;
110 static ng_rcvmsg_t ng_ether_rcvmsg;
111 static ng_shutdown_t ng_ether_shutdown;
112 static ng_newhook_t ng_ether_newhook;
113 static ng_rcvdata_t ng_ether_rcvdata;
114 static ng_disconnect_t ng_ether_disconnect;
115 static int ng_ether_mod_event(module_t mod, int event, void *data);
117 /* List of commands and how to convert arguments to/from ASCII */
118 static const struct ng_cmdlist ng_ether_cmdlist[] = {
121 NGM_ETHER_GET_IFNAME,
124 &ng_parse_string_type
128 NGM_ETHER_GET_IFINDEX,
135 NGM_ETHER_GET_ENADDR,
138 &ng_parse_enaddr_type
142 NGM_ETHER_SET_ENADDR,
144 &ng_parse_enaddr_type,
149 NGM_ETHER_GET_PROMISC,
156 NGM_ETHER_SET_PROMISC,
158 &ng_parse_int32_type,
163 NGM_ETHER_GET_AUTOSRC,
170 NGM_ETHER_SET_AUTOSRC,
172 &ng_parse_int32_type,
179 &ng_parse_enaddr_type,
186 &ng_parse_enaddr_type,
199 static struct ng_type ng_ether_typestruct = {
200 .version = NG_ABI_VERSION,
201 .name = NG_ETHER_NODE_TYPE,
202 .mod_event = ng_ether_mod_event,
203 .constructor = ng_ether_constructor,
204 .rcvmsg = ng_ether_rcvmsg,
205 .shutdown = ng_ether_shutdown,
206 .newhook = ng_ether_newhook,
207 .rcvdata = ng_ether_rcvdata,
208 .disconnect = ng_ether_disconnect,
209 .cmdlist = ng_ether_cmdlist,
211 NETGRAPH_INIT(ether, &ng_ether_typestruct);
213 /******************************************************************
214 ETHERNET FUNCTION HOOKS
215 ******************************************************************/
218 * Handle a packet that has come in on an interface. We get to
219 * look at it here before any upper layer protocols do.
221 * NOTE: this function will get called at splimp()
224 ng_ether_input(struct ifnet *ifp, struct mbuf **mp)
226 const node_p node = IFP2NG(ifp);
227 const priv_p priv = NG_NODE_PRIVATE(node);
230 /* If "lower" hook not connected, let packet continue */
231 if (priv->lower == NULL)
233 NG_SEND_DATA_ONLY(error, priv->lower, *mp); /* sets *mp = NULL */
237 * Handle a packet that has come in on an interface, and which
238 * does not match any of our known protocols (an ``orphan'').
240 * NOTE: this function will get called at splimp()
243 ng_ether_input_orphan(struct ifnet *ifp, struct mbuf *m)
245 const node_p node = IFP2NG(ifp);
246 const priv_p priv = NG_NODE_PRIVATE(node);
249 /* If "orphan" hook not connected, discard packet */
250 if (priv->orphan == NULL) {
254 NG_SEND_DATA_ONLY(error, priv->orphan, m);
258 * Handle a packet that is going out on an interface.
259 * The Ethernet header is already attached to the mbuf.
262 ng_ether_output(struct ifnet *ifp, struct mbuf **mp)
264 const node_p node = IFP2NG(ifp);
265 const priv_p priv = NG_NODE_PRIVATE(node);
268 /* If "upper" hook not connected, let packet continue */
269 if (priv->upper == NULL)
272 /* Send it out "upper" hook */
273 NG_OUTBOUND_THREAD_REF();
274 NG_SEND_DATA_ONLY(error, priv->upper, *mp);
275 NG_OUTBOUND_THREAD_UNREF();
280 * A new Ethernet interface has been attached.
281 * Create a new node for it, etc.
284 ng_ether_attach(struct ifnet *ifp)
290 * Do not create / attach an ether node to this ifnet if
291 * a netgraph node with the same name already exists.
292 * This should prevent ether nodes to become attached to
293 * eiface nodes, which may be problematic due to naming
296 if ((node = ng_name2noderef(NULL, ifp->if_xname)) != NULL) {
302 KASSERT(!IFP2NG(ifp), ("%s: node already exists?", __func__));
303 if (ng_make_node_common(&ng_ether_typestruct, &node) != 0) {
304 log(LOG_ERR, "%s: can't %s for %s\n",
305 __func__, "create node", ifp->if_xname);
309 /* Allocate private data */
310 priv = malloc(sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO);
312 log(LOG_ERR, "%s: can't %s for %s\n",
313 __func__, "allocate memory", ifp->if_xname);
317 NG_NODE_SET_PRIVATE(node, priv);
320 priv->hwassist = ifp->if_hwassist;
322 /* Try to give the node the same name as the interface */
323 if (ng_name_node(node, ifp->if_xname) != 0) {
324 log(LOG_WARNING, "%s: can't name node %s\n",
325 __func__, ifp->if_xname);
330 * An Ethernet interface is being detached.
331 * REALLY Destroy its node.
334 ng_ether_detach(struct ifnet *ifp)
336 const node_p node = IFP2NG(ifp);
337 const priv_p priv = NG_NODE_PRIVATE(node);
339 NG_NODE_REALLY_DIE(node); /* Force real removal of node */
341 * We can't assume the ifnet is still around when we run shutdown
342 * So zap it now. XXX We HOPE that anything running at this time
343 * handles it (as it should in the non netgraph case).
346 priv->ifp = NULL; /* XXX race if interrupted an output packet */
347 ng_rmnode_self(node); /* remove all netgraph parts */
351 * Notify graph about link event.
352 * if_link_state_change() has already checked that the state has changed.
355 ng_ether_link_state(struct ifnet *ifp, int state)
357 const node_p node = IFP2NG(ifp);
358 const priv_p priv = NG_NODE_PRIVATE(node);
360 int cmd, dummy_error = 0;
362 if (priv->lower == NULL)
365 if (state == LINK_STATE_UP)
366 cmd = NGM_LINK_IS_UP;
367 else if (state == LINK_STATE_DOWN)
368 cmd = NGM_LINK_IS_DOWN;
372 NG_MKMESSAGE(msg, NGM_FLOW_COOKIE, cmd, 0, M_NOWAIT);
374 NG_SEND_MSG_HOOK(dummy_error, node, msg, priv->lower, 0);
377 /******************************************************************
378 NETGRAPH NODE METHODS
379 ******************************************************************/
382 * It is not possible or allowable to create a node of this type.
383 * Nodes get created when the interface is attached (or, when
384 * this node type's KLD is loaded).
387 ng_ether_constructor(node_p node)
393 * Check for attaching a new hook.
396 ng_ether_newhook(node_p node, hook_p hook, const char *name)
398 const priv_p priv = NG_NODE_PRIVATE(node);
401 /* Divert hook is an alias for lower */
402 if (strcmp(name, NG_ETHER_HOOK_DIVERT) == 0)
403 name = NG_ETHER_HOOK_LOWER;
406 if (strcmp(name, NG_ETHER_HOOK_UPPER) == 0) {
407 hookptr = &priv->upper;
408 NG_HOOK_SET_RCVDATA(hook, ng_ether_rcv_upper);
409 NG_HOOK_SET_TO_INBOUND(hook);
410 } else if (strcmp(name, NG_ETHER_HOOK_LOWER) == 0) {
411 hookptr = &priv->lower;
412 NG_HOOK_SET_RCVDATA(hook, ng_ether_rcv_lower);
413 } else if (strcmp(name, NG_ETHER_HOOK_ORPHAN) == 0) {
414 hookptr = &priv->orphan;
415 NG_HOOK_SET_RCVDATA(hook, ng_ether_rcv_lower);
419 /* Check if already connected (shouldn't be, but doesn't hurt) */
420 if (*hookptr != NULL)
423 /* Disable hardware checksums while 'upper' hook is connected */
424 if (hookptr == &priv->upper)
425 priv->ifp->if_hwassist = 0;
426 NG_HOOK_HI_STACK(hook);
433 * Receive an incoming control message.
436 ng_ether_rcvmsg(node_p node, item_p item, hook_p lasthook)
438 const priv_p priv = NG_NODE_PRIVATE(node);
439 struct ng_mesg *resp = NULL;
443 NGI_GET_MSG(item, msg);
444 switch (msg->header.typecookie) {
445 case NGM_ETHER_COOKIE:
446 switch (msg->header.cmd) {
447 case NGM_ETHER_GET_IFNAME:
448 NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_NOWAIT);
453 strlcpy(resp->data, priv->ifp->if_xname, IFNAMSIZ);
455 case NGM_ETHER_GET_IFINDEX:
456 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
461 *((u_int32_t *)resp->data) = priv->ifp->if_index;
463 case NGM_ETHER_GET_ENADDR:
464 NG_MKRESPONSE(resp, msg, ETHER_ADDR_LEN, M_NOWAIT);
469 bcopy(IF_LLADDR(priv->ifp),
470 resp->data, ETHER_ADDR_LEN);
472 case NGM_ETHER_SET_ENADDR:
474 if (msg->header.arglen != ETHER_ADDR_LEN) {
478 error = if_setlladdr(priv->ifp,
479 (u_char *)msg->data, ETHER_ADDR_LEN);
482 case NGM_ETHER_GET_PROMISC:
483 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
488 *((u_int32_t *)resp->data) = priv->promisc;
490 case NGM_ETHER_SET_PROMISC:
494 if (msg->header.arglen != sizeof(u_int32_t)) {
498 want = !!*((u_int32_t *)msg->data);
499 if (want ^ priv->promisc) {
500 if ((error = ifpromisc(priv->ifp, want)) != 0)
502 priv->promisc = want;
506 case NGM_ETHER_GET_AUTOSRC:
507 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
512 *((u_int32_t *)resp->data) = priv->autoSrcAddr;
514 case NGM_ETHER_SET_AUTOSRC:
515 if (msg->header.arglen != sizeof(u_int32_t)) {
519 priv->autoSrcAddr = !!*((u_int32_t *)msg->data);
521 case NGM_ETHER_ADD_MULTI:
523 struct sockaddr_dl sa_dl;
524 struct ifmultiaddr *ifma;
526 if (msg->header.arglen != ETHER_ADDR_LEN) {
530 bzero(&sa_dl, sizeof(struct sockaddr_dl));
531 sa_dl.sdl_len = sizeof(struct sockaddr_dl);
532 sa_dl.sdl_family = AF_LINK;
533 sa_dl.sdl_alen = ETHER_ADDR_LEN;
534 bcopy((void *)msg->data, LLADDR(&sa_dl),
537 * Netgraph is only permitted to join groups once
538 * via the if_addmulti() KPI, because it cannot hold
539 * struct ifmultiaddr * between calls. It may also
540 * lose a race while we check if the membership
543 if_maddr_rlock(priv->ifp);
544 ifma = if_findmulti(priv->ifp,
545 (struct sockaddr *)&sa_dl);
546 if_maddr_runlock(priv->ifp);
550 error = if_addmulti(priv->ifp,
551 (struct sockaddr *)&sa_dl, &ifma);
555 case NGM_ETHER_DEL_MULTI:
557 struct sockaddr_dl sa_dl;
559 if (msg->header.arglen != ETHER_ADDR_LEN) {
563 bzero(&sa_dl, sizeof(struct sockaddr_dl));
564 sa_dl.sdl_len = sizeof(struct sockaddr_dl);
565 sa_dl.sdl_family = AF_LINK;
566 sa_dl.sdl_alen = ETHER_ADDR_LEN;
567 bcopy((void *)msg->data, LLADDR(&sa_dl),
569 error = if_delmulti(priv->ifp,
570 (struct sockaddr *)&sa_dl);
573 case NGM_ETHER_DETACH:
574 ng_ether_detach(priv->ifp);
585 NG_RESPOND_MSG(error, node, item, resp);
591 * Receive data on a hook.
592 * Since we use per-hook recveive methods this should never be called.
595 ng_ether_rcvdata(hook_p hook, item_p item)
599 panic("%s: weird hook", __func__);
600 #ifdef RESTARTABLE_PANICS /* so we don't get an error msg in LINT */
606 * Handle an mbuf received on the "lower" or "orphan" hook.
609 ng_ether_rcv_lower(hook_p hook, item_p item)
612 const node_p node = NG_HOOK_NODE(hook);
613 const priv_p priv = NG_NODE_PRIVATE(node);
614 struct ifnet *const ifp = priv->ifp;
619 /* Check whether interface is ready for packets */
621 if (!((ifp->if_flags & IFF_UP) &&
622 (ifp->if_drv_flags & IFF_DRV_RUNNING))) {
627 /* Make sure header is fully pulled up */
628 if (m->m_pkthdr.len < sizeof(struct ether_header)) {
632 if (m->m_len < sizeof(struct ether_header)
633 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL)
636 /* Drop in the MAC address if desired */
637 if (priv->autoSrcAddr) {
639 /* Make the mbuf writable if it's not already */
641 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL)
644 /* Overwrite source MAC address */
645 bcopy(IF_LLADDR(ifp),
646 mtod(m, struct ether_header *)->ether_shost,
650 /* Send it on its way */
651 return ether_output_frame(ifp, m);
655 * Handle an mbuf received on the "upper" hook.
658 ng_ether_rcv_upper(hook_p hook, item_p item)
661 const node_p node = NG_HOOK_NODE(hook);
662 const priv_p priv = NG_NODE_PRIVATE(node);
663 struct ifnet *ifp = priv->ifp;
668 /* Check length and pull off header */
669 if (m->m_pkthdr.len < sizeof(struct ether_header)) {
673 if (m->m_len < sizeof(struct ether_header) &&
674 (m = m_pullup(m, sizeof(struct ether_header))) == NULL)
677 m->m_pkthdr.rcvif = ifp;
679 /* Pass the packet to the bridge, it may come back to us */
680 if (ifp->if_bridge) {
681 BRIDGE_INPUT(ifp, m);
686 /* Route packet back in */
692 * Shutdown node. This resets the node but does not remove it
693 * unless the REALLY_DIE flag is set.
696 ng_ether_shutdown(node_p node)
698 const priv_p priv = NG_NODE_PRIVATE(node);
700 if (node->nd_flags & NGF_REALLY_DIE) {
702 * WE came here because the ethernet card is being unloaded,
703 * so stop being persistant.
704 * Actually undo all the things we did on creation.
705 * Assume the ifp has already been freed.
707 NG_NODE_SET_PRIVATE(node, NULL);
708 free(priv, M_NETGRAPH);
709 NG_NODE_UNREF(node); /* free node itself */
712 if (priv->promisc) { /* disable promiscuous mode */
713 (void)ifpromisc(priv->ifp, 0);
716 priv->autoSrcAddr = 1; /* reset auto-src-addr flag */
717 NG_NODE_REVIVE(node); /* Signal ng_rmnode we are persisant */
723 * Hook disconnection.
726 ng_ether_disconnect(hook_p hook)
728 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
730 if (hook == priv->upper) {
732 if (priv->ifp != NULL) /* restore h/w csum */
733 priv->ifp->if_hwassist = priv->hwassist;
734 } else if (hook == priv->lower)
736 else if (hook == priv->orphan)
739 panic("%s: weird hook", __func__);
740 if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
741 && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook))))
742 ng_rmnode_self(NG_HOOK_NODE(hook)); /* reset node */
746 /******************************************************************
748 ******************************************************************/
751 * Handle loading and unloading for this node type.
754 ng_ether_mod_event(module_t mod, int event, void *data)
763 /* Register function hooks */
764 if (ng_ether_attach_p != NULL) {
768 ng_ether_attach_p = ng_ether_attach;
769 ng_ether_detach_p = ng_ether_detach;
770 ng_ether_output_p = ng_ether_output;
771 ng_ether_input_p = ng_ether_input;
772 ng_ether_input_orphan_p = ng_ether_input_orphan;
773 ng_ether_link_state_p = ng_ether_link_state;
780 * Note that the base code won't try to unload us until
781 * all nodes have been removed, and that can't happen
782 * until all Ethernet interfaces are removed. In any
783 * case, we know there are no nodes left if the action
784 * is MOD_UNLOAD, so there's no need to detach any nodes.
787 /* Unregister function hooks */
788 ng_ether_attach_p = NULL;
789 ng_ether_detach_p = NULL;
790 ng_ether_output_p = NULL;
791 ng_ether_input_p = NULL;
792 ng_ether_input_orphan_p = NULL;
793 ng_ether_link_state_p = NULL;
805 vnet_ng_ether_init(const void *unused)
809 /* If module load was rejected, don't attach to vnets. */
810 if (ng_ether_attach_p != ng_ether_attach)
813 /* Create nodes for any already-existing Ethernet interfaces. */
815 TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
816 if (ifp->if_type == IFT_ETHER
817 || ifp->if_type == IFT_L2VLAN)
818 ng_ether_attach(ifp);
822 VNET_SYSINIT(vnet_ng_ether_init, SI_SUB_PSEUDO, SI_ORDER_ANY,
823 vnet_ng_ether_init, NULL);