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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/eventhandler.h>
51 #include <sys/systm.h>
52 #include <sys/kernel.h>
53 #include <sys/malloc.h>
55 #include <sys/errno.h>
57 #include <sys/syslog.h>
58 #include <sys/socket.h>
59 #include <sys/taskqueue.h>
62 #include <net/if_dl.h>
63 #include <net/if_types.h>
64 #include <net/if_arp.h>
65 #include <net/if_var.h>
66 #include <net/ethernet.h>
67 #include <net/if_bridgevar.h>
70 #include <netgraph/ng_message.h>
71 #include <netgraph/netgraph.h>
72 #include <netgraph/ng_parse.h>
73 #include <netgraph/ng_ether.h>
75 MODULE_VERSION(ng_ether, 1);
77 #define IFP2NG(ifp) ((ifp)->if_l2com)
79 /* Per-node private data */
81 struct ifnet *ifp; /* associated interface */
82 hook_p upper; /* upper hook connection */
83 hook_p lower; /* lower hook connection */
84 hook_p orphan; /* orphan hook connection */
85 u_char autoSrcAddr; /* always overwrite source address */
86 u_char promisc; /* promiscuous mode enabled */
87 u_long hwassist; /* hardware checksum capabilities */
88 u_int flags; /* flags e.g. really die */
90 typedef struct private *priv_p;
92 /* Hook pointers used by if_ethersubr.c to callback to netgraph */
93 extern void (*ng_ether_input_p)(struct ifnet *ifp, struct mbuf **mp);
94 extern void (*ng_ether_input_orphan_p)(struct ifnet *ifp, struct mbuf *m);
95 extern int (*ng_ether_output_p)(struct ifnet *ifp, struct mbuf **mp);
96 extern void (*ng_ether_attach_p)(struct ifnet *ifp);
97 extern void (*ng_ether_detach_p)(struct ifnet *ifp);
98 extern void (*ng_ether_link_state_p)(struct ifnet *ifp, int state);
100 /* Functional hooks called from if_ethersubr.c */
101 static void ng_ether_input(struct ifnet *ifp, struct mbuf **mp);
102 static void ng_ether_input_orphan(struct ifnet *ifp, struct mbuf *m);
103 static int ng_ether_output(struct ifnet *ifp, struct mbuf **mp);
104 static void ng_ether_attach(struct ifnet *ifp);
105 static void ng_ether_detach(struct ifnet *ifp);
106 static void ng_ether_link_state(struct ifnet *ifp, int state);
108 /* Other functions */
109 static int ng_ether_rcv_lower(hook_p node, item_p item);
110 static int ng_ether_rcv_upper(hook_p node, item_p item);
112 /* Netgraph node methods */
113 static ng_constructor_t ng_ether_constructor;
114 static ng_rcvmsg_t ng_ether_rcvmsg;
115 static ng_shutdown_t ng_ether_shutdown;
116 static ng_newhook_t ng_ether_newhook;
117 static ng_rcvdata_t ng_ether_rcvdata;
118 static ng_disconnect_t ng_ether_disconnect;
119 static int ng_ether_mod_event(module_t mod, int event, void *data);
121 static eventhandler_tag ng_ether_ifnet_arrival_cookie;
123 /* List of commands and how to convert arguments to/from ASCII */
124 static const struct ng_cmdlist ng_ether_cmdlist[] = {
127 NGM_ETHER_GET_IFNAME,
130 &ng_parse_string_type
134 NGM_ETHER_GET_IFINDEX,
141 NGM_ETHER_GET_ENADDR,
144 &ng_parse_enaddr_type
148 NGM_ETHER_SET_ENADDR,
150 &ng_parse_enaddr_type,
155 NGM_ETHER_GET_PROMISC,
162 NGM_ETHER_SET_PROMISC,
164 &ng_parse_int32_type,
169 NGM_ETHER_GET_AUTOSRC,
176 NGM_ETHER_SET_AUTOSRC,
178 &ng_parse_int32_type,
185 &ng_parse_enaddr_type,
192 &ng_parse_enaddr_type,
205 static struct ng_type ng_ether_typestruct = {
206 .version = NG_ABI_VERSION,
207 .name = NG_ETHER_NODE_TYPE,
208 .mod_event = ng_ether_mod_event,
209 .constructor = ng_ether_constructor,
210 .rcvmsg = ng_ether_rcvmsg,
211 .shutdown = ng_ether_shutdown,
212 .newhook = ng_ether_newhook,
213 .rcvdata = ng_ether_rcvdata,
214 .disconnect = ng_ether_disconnect,
215 .cmdlist = ng_ether_cmdlist,
217 NETGRAPH_INIT(ether, &ng_ether_typestruct);
219 /******************************************************************
221 ******************************************************************/
223 ng_ether_sanitize_ifname(const char *ifname, char *name)
227 for (i = 0; i < IFNAMSIZ; i++) {
228 if (ifname[i] == '.' || ifname[i] == ':')
237 /******************************************************************
238 ETHERNET FUNCTION HOOKS
239 ******************************************************************/
242 * Handle a packet that has come in on an interface. We get to
243 * look at it here before any upper layer protocols do.
246 ng_ether_input(struct ifnet *ifp, struct mbuf **mp)
248 const node_p node = IFP2NG(ifp);
249 const priv_p priv = NG_NODE_PRIVATE(node);
252 /* If "lower" hook not connected, let packet continue */
253 if (priv->lower == NULL)
255 NG_SEND_DATA_ONLY(error, priv->lower, *mp); /* sets *mp = NULL */
259 * Handle a packet that has come in on an interface, and which
260 * does not match any of our known protocols (an ``orphan'').
263 ng_ether_input_orphan(struct ifnet *ifp, struct mbuf *m)
265 const node_p node = IFP2NG(ifp);
266 const priv_p priv = NG_NODE_PRIVATE(node);
269 /* If "orphan" hook not connected, discard packet */
270 if (priv->orphan == NULL) {
274 NG_SEND_DATA_ONLY(error, priv->orphan, m);
278 * Handle a packet that is going out on an interface.
279 * The Ethernet header is already attached to the mbuf.
282 ng_ether_output(struct ifnet *ifp, struct mbuf **mp)
284 const node_p node = IFP2NG(ifp);
285 const priv_p priv = NG_NODE_PRIVATE(node);
288 /* If "upper" hook not connected, let packet continue */
289 if (priv->upper == NULL)
292 /* Send it out "upper" hook */
293 NG_OUTBOUND_THREAD_REF();
294 NG_SEND_DATA_ONLY(error, priv->upper, *mp);
295 NG_OUTBOUND_THREAD_UNREF();
300 * A new Ethernet interface has been attached.
301 * Create a new node for it, etc.
304 ng_ether_attach(struct ifnet *ifp)
311 * Do not create / attach an ether node to this ifnet if
312 * a netgraph node with the same name already exists.
313 * This should prevent ether nodes to become attached to
314 * eiface nodes, which may be problematic due to naming
317 ng_ether_sanitize_ifname(ifp->if_xname, name);
318 if ((node = ng_name2noderef(NULL, name)) != NULL) {
324 KASSERT(!IFP2NG(ifp), ("%s: node already exists?", __func__));
325 if (ng_make_node_common(&ng_ether_typestruct, &node) != 0) {
326 log(LOG_ERR, "%s: can't %s for %s\n",
327 __func__, "create node", ifp->if_xname);
331 /* Allocate private data */
332 priv = malloc(sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO);
334 log(LOG_ERR, "%s: can't %s for %s\n",
335 __func__, "allocate memory", ifp->if_xname);
339 NG_NODE_SET_PRIVATE(node, priv);
342 priv->hwassist = ifp->if_hwassist;
344 /* Try to give the node the same name as the interface */
345 if (ng_name_node(node, name) != 0)
346 log(LOG_WARNING, "%s: can't name node %s\n", __func__, name);
350 * An Ethernet interface is being detached.
351 * REALLY Destroy its node.
354 ng_ether_detach(struct ifnet *ifp)
356 const node_p node = IFP2NG(ifp);
357 const priv_p priv = NG_NODE_PRIVATE(node);
359 taskqueue_drain(taskqueue_swi, &ifp->if_linktask);
360 NG_NODE_REALLY_DIE(node); /* Force real removal of node */
362 * We can't assume the ifnet is still around when we run shutdown
363 * So zap it now. XXX We HOPE that anything running at this time
364 * handles it (as it should in the non netgraph case).
367 priv->ifp = NULL; /* XXX race if interrupted an output packet */
368 ng_rmnode_self(node); /* remove all netgraph parts */
372 * Notify graph about link event.
373 * if_link_state_change() has already checked that the state has changed.
376 ng_ether_link_state(struct ifnet *ifp, int state)
378 const node_p node = IFP2NG(ifp);
379 const priv_p priv = NG_NODE_PRIVATE(node);
381 int cmd, dummy_error = 0;
383 if (state == LINK_STATE_UP)
384 cmd = NGM_LINK_IS_UP;
385 else if (state == LINK_STATE_DOWN)
386 cmd = NGM_LINK_IS_DOWN;
390 if (priv->lower != NULL) {
391 NG_MKMESSAGE(msg, NGM_FLOW_COOKIE, cmd, 0, M_NOWAIT);
393 NG_SEND_MSG_HOOK(dummy_error, node, msg, priv->lower, 0);
395 if (priv->orphan != NULL) {
396 NG_MKMESSAGE(msg, NGM_FLOW_COOKIE, cmd, 0, M_NOWAIT);
398 NG_SEND_MSG_HOOK(dummy_error, node, msg, priv->orphan, 0);
403 * Interface arrival notification handler.
404 * The notification is produced in two cases:
405 * o a new interface arrives
406 * o an existing interface got renamed
407 * Currently the first case is handled by ng_ether_attach via special
408 * hook ng_ether_attach_p.
411 ng_ether_ifnet_arrival_event(void *arg __unused, struct ifnet *ifp)
416 /* Only ethernet interfaces are of interest. */
417 if (ifp->if_type != IFT_ETHER &&
418 ifp->if_type != IFT_L2VLAN &&
419 ifp->if_type != IFT_BRIDGE)
423 * Just return if it's a new interface without an ng_ether companion.
429 /* Try to give the node the same name as the new interface name */
430 ng_ether_sanitize_ifname(ifp->if_xname, name);
431 if (ng_name_node(node, name) != 0)
432 log(LOG_WARNING, "%s: can't re-name node %s\n", __func__, name);
435 /******************************************************************
436 NETGRAPH NODE METHODS
437 ******************************************************************/
440 * It is not possible or allowable to create a node of this type.
441 * Nodes get created when the interface is attached (or, when
442 * this node type's KLD is loaded).
445 ng_ether_constructor(node_p node)
451 * Check for attaching a new hook.
454 ng_ether_newhook(node_p node, hook_p hook, const char *name)
456 const priv_p priv = NG_NODE_PRIVATE(node);
459 /* Divert hook is an alias for lower */
460 if (strcmp(name, NG_ETHER_HOOK_DIVERT) == 0)
461 name = NG_ETHER_HOOK_LOWER;
464 if (strcmp(name, NG_ETHER_HOOK_UPPER) == 0) {
465 hookptr = &priv->upper;
466 NG_HOOK_SET_RCVDATA(hook, ng_ether_rcv_upper);
467 NG_HOOK_SET_TO_INBOUND(hook);
468 } else if (strcmp(name, NG_ETHER_HOOK_LOWER) == 0) {
469 hookptr = &priv->lower;
470 NG_HOOK_SET_RCVDATA(hook, ng_ether_rcv_lower);
471 } else if (strcmp(name, NG_ETHER_HOOK_ORPHAN) == 0) {
472 hookptr = &priv->orphan;
473 NG_HOOK_SET_RCVDATA(hook, ng_ether_rcv_lower);
477 /* Check if already connected (shouldn't be, but doesn't hurt) */
478 if (*hookptr != NULL)
481 /* Disable hardware checksums while 'upper' hook is connected */
482 if (hookptr == &priv->upper)
483 priv->ifp->if_hwassist = 0;
484 NG_HOOK_HI_STACK(hook);
491 * Receive an incoming control message.
494 ng_ether_rcvmsg(node_p node, item_p item, hook_p lasthook)
496 const priv_p priv = NG_NODE_PRIVATE(node);
497 struct ng_mesg *resp = NULL;
501 NGI_GET_MSG(item, msg);
502 switch (msg->header.typecookie) {
503 case NGM_ETHER_COOKIE:
504 switch (msg->header.cmd) {
505 case NGM_ETHER_GET_IFNAME:
506 NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_NOWAIT);
511 strlcpy(resp->data, priv->ifp->if_xname, IFNAMSIZ);
513 case NGM_ETHER_GET_IFINDEX:
514 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
519 *((u_int32_t *)resp->data) = priv->ifp->if_index;
521 case NGM_ETHER_GET_ENADDR:
522 NG_MKRESPONSE(resp, msg, ETHER_ADDR_LEN, M_NOWAIT);
527 bcopy(IF_LLADDR(priv->ifp),
528 resp->data, ETHER_ADDR_LEN);
530 case NGM_ETHER_SET_ENADDR:
532 if (msg->header.arglen != ETHER_ADDR_LEN) {
536 error = if_setlladdr(priv->ifp,
537 (u_char *)msg->data, ETHER_ADDR_LEN);
540 case NGM_ETHER_GET_PROMISC:
541 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
546 *((u_int32_t *)resp->data) = priv->promisc;
548 case NGM_ETHER_SET_PROMISC:
552 if (msg->header.arglen != sizeof(u_int32_t)) {
556 want = !!*((u_int32_t *)msg->data);
557 if (want ^ priv->promisc) {
558 if ((error = ifpromisc(priv->ifp, want)) != 0)
560 priv->promisc = want;
564 case NGM_ETHER_GET_AUTOSRC:
565 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
570 *((u_int32_t *)resp->data) = priv->autoSrcAddr;
572 case NGM_ETHER_SET_AUTOSRC:
573 if (msg->header.arglen != sizeof(u_int32_t)) {
577 priv->autoSrcAddr = !!*((u_int32_t *)msg->data);
579 case NGM_ETHER_ADD_MULTI:
581 struct sockaddr_dl sa_dl;
582 struct epoch_tracker et;
583 struct ifmultiaddr *ifma;
585 if (msg->header.arglen != ETHER_ADDR_LEN) {
589 bzero(&sa_dl, sizeof(struct sockaddr_dl));
590 sa_dl.sdl_len = sizeof(struct sockaddr_dl);
591 sa_dl.sdl_family = AF_LINK;
592 sa_dl.sdl_alen = ETHER_ADDR_LEN;
593 bcopy((void *)msg->data, LLADDR(&sa_dl),
596 * Netgraph is only permitted to join groups once
597 * via the if_addmulti() KPI, because it cannot hold
598 * struct ifmultiaddr * between calls. It may also
599 * lose a race while we check if the membership
603 ifma = if_findmulti(priv->ifp,
604 (struct sockaddr *)&sa_dl);
609 error = if_addmulti(priv->ifp,
610 (struct sockaddr *)&sa_dl, &ifma);
614 case NGM_ETHER_DEL_MULTI:
616 struct sockaddr_dl sa_dl;
618 if (msg->header.arglen != ETHER_ADDR_LEN) {
622 bzero(&sa_dl, sizeof(struct sockaddr_dl));
623 sa_dl.sdl_len = sizeof(struct sockaddr_dl);
624 sa_dl.sdl_family = AF_LINK;
625 sa_dl.sdl_alen = ETHER_ADDR_LEN;
626 bcopy((void *)msg->data, LLADDR(&sa_dl),
628 error = if_delmulti(priv->ifp,
629 (struct sockaddr *)&sa_dl);
632 case NGM_ETHER_DETACH:
633 ng_ether_detach(priv->ifp);
644 NG_RESPOND_MSG(error, node, item, resp);
650 * Receive data on a hook.
651 * Since we use per-hook recveive methods this should never be called.
654 ng_ether_rcvdata(hook_p hook, item_p item)
658 panic("%s: weird hook", __func__);
662 * Handle an mbuf received on the "lower" or "orphan" hook.
665 ng_ether_rcv_lower(hook_p hook, item_p item)
668 const node_p node = NG_HOOK_NODE(hook);
669 const priv_p priv = NG_NODE_PRIVATE(node);
670 struct ifnet *const ifp = priv->ifp;
675 /* Check whether interface is ready for packets */
677 if (!((ifp->if_flags & IFF_UP) &&
678 (ifp->if_drv_flags & IFF_DRV_RUNNING))) {
683 /* Make sure header is fully pulled up */
684 if (m->m_pkthdr.len < sizeof(struct ether_header)) {
688 if (m->m_len < sizeof(struct ether_header)
689 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL)
692 /* Drop in the MAC address if desired */
693 if (priv->autoSrcAddr) {
694 /* Make the mbuf writable if it's not already */
696 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL)
699 /* Overwrite source MAC address */
700 bcopy(IF_LLADDR(ifp),
701 mtod(m, struct ether_header *)->ether_shost,
705 /* Send it on its way */
706 return ether_output_frame(ifp, m);
710 * Handle an mbuf received on the "upper" hook.
713 ng_ether_rcv_upper(hook_p hook, item_p item)
716 const node_p node = NG_HOOK_NODE(hook);
717 const priv_p priv = NG_NODE_PRIVATE(node);
718 struct ifnet *ifp = priv->ifp;
723 /* Check length and pull off header */
724 if (m->m_pkthdr.len < sizeof(struct ether_header)) {
728 if (m->m_len < sizeof(struct ether_header) &&
729 (m = m_pullup(m, sizeof(struct ether_header))) == NULL)
732 m->m_pkthdr.rcvif = ifp;
734 /* Pass the packet to the bridge, it may come back to us */
735 if (ifp->if_bridge) {
736 BRIDGE_INPUT(ifp, m);
741 /* Route packet back in */
747 * Shutdown node. This resets the node but does not remove it
748 * unless the REALLY_DIE flag is set.
751 ng_ether_shutdown(node_p node)
753 const priv_p priv = NG_NODE_PRIVATE(node);
755 if (node->nd_flags & NGF_REALLY_DIE) {
757 * The ifnet is going away, perhaps because the driver was
758 * unloaded or its vnet is being torn down.
760 NG_NODE_SET_PRIVATE(node, NULL);
761 if (priv->ifp != NULL)
762 IFP2NG(priv->ifp) = NULL;
763 free(priv, M_NETGRAPH);
764 NG_NODE_UNREF(node); /* free node itself */
767 if (priv->promisc) { /* disable promiscuous mode */
768 (void)ifpromisc(priv->ifp, 0);
771 NG_NODE_REVIVE(node); /* Signal ng_rmnode we are persisant */
777 * Hook disconnection.
780 ng_ether_disconnect(hook_p hook)
782 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
784 if (hook == priv->upper) {
786 if (priv->ifp != NULL) /* restore h/w csum */
787 priv->ifp->if_hwassist = priv->hwassist;
788 } else if (hook == priv->lower)
790 else if (hook == priv->orphan)
793 panic("%s: weird hook", __func__);
794 if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
795 && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook))))
796 ng_rmnode_self(NG_HOOK_NODE(hook)); /* reset node */
800 /******************************************************************
802 ******************************************************************/
805 * Handle loading and unloading for this node type.
808 ng_ether_mod_event(module_t mod, int event, void *data)
815 /* Register function hooks */
816 if (ng_ether_attach_p != NULL) {
820 ng_ether_attach_p = ng_ether_attach;
821 ng_ether_detach_p = ng_ether_detach;
822 ng_ether_output_p = ng_ether_output;
823 ng_ether_input_p = ng_ether_input;
824 ng_ether_input_orphan_p = ng_ether_input_orphan;
825 ng_ether_link_state_p = ng_ether_link_state;
827 ng_ether_ifnet_arrival_cookie =
828 EVENTHANDLER_REGISTER(ifnet_arrival_event,
829 ng_ether_ifnet_arrival_event, NULL, EVENTHANDLER_PRI_ANY);
835 * Note that the base code won't try to unload us until
836 * all nodes have been removed, and that can't happen
837 * until all Ethernet interfaces are removed. In any
838 * case, we know there are no nodes left if the action
839 * is MOD_UNLOAD, so there's no need to detach any nodes.
842 EVENTHANDLER_DEREGISTER(ifnet_arrival_event,
843 ng_ether_ifnet_arrival_cookie);
845 /* Unregister function hooks */
846 ng_ether_attach_p = NULL;
847 ng_ether_detach_p = NULL;
848 ng_ether_output_p = NULL;
849 ng_ether_input_p = NULL;
850 ng_ether_input_orphan_p = NULL;
851 ng_ether_link_state_p = NULL;
862 vnet_ng_ether_init(const void *unused)
866 /* If module load was rejected, don't attach to vnets. */
867 if (ng_ether_attach_p != ng_ether_attach)
870 /* Create nodes for any already-existing Ethernet interfaces. */
872 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
873 if (ifp->if_type == IFT_ETHER ||
874 ifp->if_type == IFT_L2VLAN ||
875 ifp->if_type == IFT_BRIDGE)
876 ng_ether_attach(ifp);
880 VNET_SYSINIT(vnet_ng_ether_init, SI_SUB_PSEUDO, SI_ORDER_ANY,
881 vnet_ng_ether_init, NULL);