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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>
55 #include <sys/syslog.h>
56 #include <sys/socket.h>
59 #include <net/if_dl.h>
60 #include <net/if_types.h>
61 #include <net/if_arp.h>
62 #include <net/if_var.h>
63 #include <net/ethernet.h>
64 #include <net/if_bridgevar.h>
66 #include <netgraph/ng_message.h>
67 #include <netgraph/netgraph.h>
68 #include <netgraph/ng_parse.h>
69 #include <netgraph/ng_ether.h>
71 #define IFP2NG(ifp) (IFP2AC((ifp))->ac_netgraph)
73 /* Per-node private data */
75 struct ifnet *ifp; /* associated interface */
76 hook_p upper; /* upper hook connection */
77 hook_p lower; /* lower hook connection */
78 hook_p orphan; /* orphan hook connection */
79 u_char autoSrcAddr; /* always overwrite source address */
80 u_char promisc; /* promiscuous mode enabled */
81 u_long hwassist; /* hardware checksum capabilities */
82 u_int flags; /* flags e.g. really die */
84 typedef struct private *priv_p;
86 /* Hook pointers used by if_ethersubr.c to callback to netgraph */
87 extern void (*ng_ether_input_p)(struct ifnet *ifp, struct mbuf **mp);
88 extern void (*ng_ether_input_orphan_p)(struct ifnet *ifp, struct mbuf *m);
89 extern int (*ng_ether_output_p)(struct ifnet *ifp, struct mbuf **mp);
90 extern void (*ng_ether_attach_p)(struct ifnet *ifp);
91 extern void (*ng_ether_detach_p)(struct ifnet *ifp);
92 extern void (*ng_ether_link_state_p)(struct ifnet *ifp, int state);
94 /* Functional hooks called from if_ethersubr.c */
95 static void ng_ether_input(struct ifnet *ifp, struct mbuf **mp);
96 static void ng_ether_input_orphan(struct ifnet *ifp, struct mbuf *m);
97 static int ng_ether_output(struct ifnet *ifp, struct mbuf **mp);
98 static void ng_ether_attach(struct ifnet *ifp);
99 static void ng_ether_detach(struct ifnet *ifp);
100 static void ng_ether_link_state(struct ifnet *ifp, int state);
102 /* Other functions */
103 static int ng_ether_rcv_lower(node_p node, struct mbuf *m);
104 static int ng_ether_rcv_upper(node_p node, struct mbuf *m);
106 /* Netgraph node methods */
107 static ng_constructor_t ng_ether_constructor;
108 static ng_rcvmsg_t ng_ether_rcvmsg;
109 static ng_shutdown_t ng_ether_shutdown;
110 static ng_newhook_t ng_ether_newhook;
111 static ng_rcvdata_t ng_ether_rcvdata;
112 static ng_disconnect_t ng_ether_disconnect;
113 static int ng_ether_mod_event(module_t mod, int event, void *data);
115 /* List of commands and how to convert arguments to/from ASCII */
116 static const struct ng_cmdlist ng_ether_cmdlist[] = {
119 NGM_ETHER_GET_IFNAME,
122 &ng_parse_string_type
126 NGM_ETHER_GET_IFINDEX,
133 NGM_ETHER_GET_ENADDR,
136 &ng_parse_enaddr_type
140 NGM_ETHER_SET_ENADDR,
142 &ng_parse_enaddr_type,
147 NGM_ETHER_GET_PROMISC,
154 NGM_ETHER_SET_PROMISC,
156 &ng_parse_int32_type,
161 NGM_ETHER_GET_AUTOSRC,
168 NGM_ETHER_SET_AUTOSRC,
170 &ng_parse_int32_type,
177 &ng_parse_enaddr_type,
184 &ng_parse_enaddr_type,
197 static struct ng_type ng_ether_typestruct = {
198 .version = NG_ABI_VERSION,
199 .name = NG_ETHER_NODE_TYPE,
200 .mod_event = ng_ether_mod_event,
201 .constructor = ng_ether_constructor,
202 .rcvmsg = ng_ether_rcvmsg,
203 .shutdown = ng_ether_shutdown,
204 .newhook = ng_ether_newhook,
205 .rcvdata = ng_ether_rcvdata,
206 .disconnect = ng_ether_disconnect,
207 .cmdlist = ng_ether_cmdlist,
209 NETGRAPH_INIT(ether, &ng_ether_typestruct);
211 /******************************************************************
212 ETHERNET FUNCTION HOOKS
213 ******************************************************************/
216 * Handle a packet that has come in on an interface. We get to
217 * look at it here before any upper layer protocols do.
219 * NOTE: this function will get called at splimp()
222 ng_ether_input(struct ifnet *ifp, struct mbuf **mp)
224 const node_p node = IFP2NG(ifp);
225 const priv_p priv = NG_NODE_PRIVATE(node);
228 /* If "lower" hook not connected, let packet continue */
229 if (priv->lower == NULL)
231 NG_SEND_DATA_ONLY(error, priv->lower, *mp); /* sets *mp = NULL */
235 * Handle a packet that has come in on an interface, and which
236 * does not match any of our known protocols (an ``orphan'').
238 * NOTE: this function will get called at splimp()
241 ng_ether_input_orphan(struct ifnet *ifp, struct mbuf *m)
243 const node_p node = IFP2NG(ifp);
244 const priv_p priv = NG_NODE_PRIVATE(node);
247 /* If "orphan" hook not connected, discard packet */
248 if (priv->orphan == NULL) {
252 NG_SEND_DATA_ONLY(error, priv->orphan, m);
256 * Handle a packet that is going out on an interface.
257 * The Ethernet header is already attached to the mbuf.
260 ng_ether_output(struct ifnet *ifp, struct mbuf **mp)
262 const node_p node = IFP2NG(ifp);
263 const priv_p priv = NG_NODE_PRIVATE(node);
266 /* If "upper" hook not connected, let packet continue */
267 if (priv->upper == NULL)
270 /* Send it out "upper" hook */
271 NG_SEND_DATA_ONLY(error, priv->upper, *mp);
276 * A new Ethernet interface has been attached.
277 * Create a new node for it, etc.
280 ng_ether_attach(struct ifnet *ifp)
286 KASSERT(!IFP2NG(ifp), ("%s: node already exists?", __func__));
287 if (ng_make_node_common(&ng_ether_typestruct, &node) != 0) {
288 log(LOG_ERR, "%s: can't %s for %s\n",
289 __func__, "create node", ifp->if_xname);
293 /* Allocate private data */
294 MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO);
296 log(LOG_ERR, "%s: can't %s for %s\n",
297 __func__, "allocate memory", ifp->if_xname);
301 NG_NODE_SET_PRIVATE(node, priv);
304 priv->autoSrcAddr = 1;
305 priv->hwassist = ifp->if_hwassist;
307 /* Try to give the node the same name as the interface */
308 if (ng_name_node(node, ifp->if_xname) != 0) {
309 log(LOG_WARNING, "%s: can't name node %s\n",
310 __func__, ifp->if_xname);
315 * An Ethernet interface is being detached.
316 * REALLY Destroy its node.
319 ng_ether_detach(struct ifnet *ifp)
321 const node_p node = IFP2NG(ifp);
322 const priv_p priv = NG_NODE_PRIVATE(node);
324 NG_NODE_REALLY_DIE(node); /* Force real removal of node */
326 * We can't assume the ifnet is still around when we run shutdown
327 * So zap it now. XXX We HOPE that anything running at this time
328 * handles it (as it should in the non netgraph case).
331 priv->ifp = NULL; /* XXX race if interrupted an output packet */
332 ng_rmnode_self(node); /* remove all netgraph parts */
336 * Notify graph about link event.
337 * if_link_state_change() has already checked that the state has changed.
340 ng_ether_link_state(struct ifnet *ifp, int state)
342 const node_p node = IFP2NG(ifp);
343 const priv_p priv = NG_NODE_PRIVATE(node);
345 int cmd, dummy_error = 0;
347 if (priv->lower == NULL)
350 if (state == LINK_STATE_UP)
351 cmd = NGM_LINK_IS_UP;
352 else if (state == LINK_STATE_DOWN)
353 cmd = NGM_LINK_IS_DOWN;
357 NG_MKMESSAGE(msg, NGM_FLOW_COOKIE, cmd, 0, M_NOWAIT);
359 NG_SEND_MSG_HOOK(dummy_error, node, msg, priv->lower, 0);
362 /******************************************************************
363 NETGRAPH NODE METHODS
364 ******************************************************************/
367 * It is not possible or allowable to create a node of this type.
368 * Nodes get created when the interface is attached (or, when
369 * this node type's KLD is loaded).
372 ng_ether_constructor(node_p node)
378 * Check for attaching a new hook.
381 ng_ether_newhook(node_p node, hook_p hook, const char *name)
383 const priv_p priv = NG_NODE_PRIVATE(node);
386 /* Divert hook is an alias for lower */
387 if (strcmp(name, NG_ETHER_HOOK_DIVERT) == 0)
388 name = NG_ETHER_HOOK_LOWER;
391 if (strcmp(name, NG_ETHER_HOOK_UPPER) == 0)
392 hookptr = &priv->upper;
393 else if (strcmp(name, NG_ETHER_HOOK_LOWER) == 0)
394 hookptr = &priv->lower;
395 else if (strcmp(name, NG_ETHER_HOOK_ORPHAN) == 0)
396 hookptr = &priv->orphan;
400 /* Check if already connected (shouldn't be, but doesn't hurt) */
401 if (*hookptr != NULL)
404 /* Disable hardware checksums while 'upper' hook is connected */
405 if (hookptr == &priv->upper)
406 priv->ifp->if_hwassist = 0;
414 * Receive an incoming control message.
417 ng_ether_rcvmsg(node_p node, item_p item, hook_p lasthook)
419 const priv_p priv = NG_NODE_PRIVATE(node);
420 struct ng_mesg *resp = NULL;
424 NGI_GET_MSG(item, msg);
425 switch (msg->header.typecookie) {
426 case NGM_ETHER_COOKIE:
427 switch (msg->header.cmd) {
428 case NGM_ETHER_GET_IFNAME:
429 NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_NOWAIT);
434 strlcpy(resp->data, priv->ifp->if_xname, IFNAMSIZ);
436 case NGM_ETHER_GET_IFINDEX:
437 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
442 *((u_int32_t *)resp->data) = priv->ifp->if_index;
444 case NGM_ETHER_GET_ENADDR:
445 NG_MKRESPONSE(resp, msg, ETHER_ADDR_LEN, M_NOWAIT);
450 bcopy(IF_LLADDR(priv->ifp),
451 resp->data, ETHER_ADDR_LEN);
453 case NGM_ETHER_SET_ENADDR:
455 if (msg->header.arglen != ETHER_ADDR_LEN) {
459 error = if_setlladdr(priv->ifp,
460 (u_char *)msg->data, ETHER_ADDR_LEN);
463 case NGM_ETHER_GET_PROMISC:
464 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
469 *((u_int32_t *)resp->data) = priv->promisc;
471 case NGM_ETHER_SET_PROMISC:
475 if (msg->header.arglen != sizeof(u_int32_t)) {
479 want = !!*((u_int32_t *)msg->data);
480 if (want ^ priv->promisc) {
481 if ((error = ifpromisc(priv->ifp, want)) != 0)
483 priv->promisc = want;
487 case NGM_ETHER_GET_AUTOSRC:
488 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
493 *((u_int32_t *)resp->data) = priv->autoSrcAddr;
495 case NGM_ETHER_SET_AUTOSRC:
496 if (msg->header.arglen != sizeof(u_int32_t)) {
500 priv->autoSrcAddr = !!*((u_int32_t *)msg->data);
502 case NGM_ETHER_ADD_MULTI:
504 struct sockaddr_dl sa_dl;
505 struct ifmultiaddr *ifm;
507 if (msg->header.arglen != ETHER_ADDR_LEN) {
511 bzero(&sa_dl, sizeof(struct sockaddr_dl));
512 sa_dl.sdl_len = sizeof(struct sockaddr_dl);
513 sa_dl.sdl_family = AF_LINK;
514 sa_dl.sdl_alen = ETHER_ADDR_LEN;
515 bcopy((void *)msg->data, LLADDR(&sa_dl),
517 error = if_addmulti(priv->ifp,
518 (struct sockaddr *)&sa_dl, &ifm);
521 case NGM_ETHER_DEL_MULTI:
523 struct sockaddr_dl sa_dl;
525 if (msg->header.arglen != ETHER_ADDR_LEN) {
529 bzero(&sa_dl, sizeof(struct sockaddr_dl));
530 sa_dl.sdl_len = sizeof(struct sockaddr_dl);
531 sa_dl.sdl_family = AF_LINK;
532 sa_dl.sdl_alen = ETHER_ADDR_LEN;
533 bcopy((void *)msg->data, LLADDR(&sa_dl),
535 error = if_delmulti(priv->ifp,
536 (struct sockaddr *)&sa_dl);
539 case NGM_ETHER_DETACH:
540 ng_ether_detach(priv->ifp);
551 NG_RESPOND_MSG(error, node, item, resp);
557 * Receive data on a hook.
560 ng_ether_rcvdata(hook_p hook, item_p item)
562 const node_p node = NG_HOOK_NODE(hook);
563 const priv_p priv = NG_NODE_PRIVATE(node);
569 if (hook == priv->lower || hook == priv->orphan)
570 return ng_ether_rcv_lower(node, m);
571 if (hook == priv->upper)
572 return ng_ether_rcv_upper(node, m);
573 panic("%s: weird hook", __func__);
574 #ifdef RESTARTABLE_PANICS /* so we don't get an error msg in LINT */
580 * Handle an mbuf received on the "lower" or "orphan" hook.
583 ng_ether_rcv_lower(node_p node, struct mbuf *m)
585 const priv_p priv = NG_NODE_PRIVATE(node);
586 struct ifnet *const ifp = priv->ifp;
588 /* Check whether interface is ready for packets */
589 if (!((ifp->if_flags & IFF_UP) &&
590 (ifp->if_drv_flags & IFF_DRV_RUNNING))) {
595 /* Make sure header is fully pulled up */
596 if (m->m_pkthdr.len < sizeof(struct ether_header)) {
600 if (m->m_len < sizeof(struct ether_header)
601 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL)
604 /* Drop in the MAC address if desired */
605 if (priv->autoSrcAddr) {
607 /* Make the mbuf writable if it's not already */
609 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL)
612 /* Overwrite source MAC address */
613 bcopy(IF_LLADDR(ifp),
614 mtod(m, struct ether_header *)->ether_shost,
618 /* Send it on its way */
619 return ether_output_frame(ifp, m);
623 * Handle an mbuf received on the "upper" hook.
626 ng_ether_rcv_upper(node_p node, struct mbuf *m)
628 const priv_p priv = NG_NODE_PRIVATE(node);
629 struct ifnet *ifp = priv->ifp;
631 /* Check length and pull off header */
632 if (m->m_pkthdr.len < sizeof(struct ether_header)) {
636 if (m->m_len < sizeof(struct ether_header) &&
637 (m = m_pullup(m, sizeof(struct ether_header))) == NULL)
640 m->m_pkthdr.rcvif = ifp;
642 /* Pass the packet to the bridge, it may come back to us */
643 if (ifp->if_bridge) {
644 BRIDGE_INPUT(ifp, m);
649 /* Route packet back in */
655 * Shutdown node. This resets the node but does not remove it
656 * unless the REALLY_DIE flag is set.
659 ng_ether_shutdown(node_p node)
661 const priv_p priv = NG_NODE_PRIVATE(node);
663 if (node->nd_flags & NGF_REALLY_DIE) {
665 * WE came here because the ethernet card is being unloaded,
666 * so stop being persistant.
667 * Actually undo all the things we did on creation.
668 * Assume the ifp has already been freed.
670 NG_NODE_SET_PRIVATE(node, NULL);
671 FREE(priv, M_NETGRAPH);
672 NG_NODE_UNREF(node); /* free node itself */
675 if (priv->promisc) { /* disable promiscuous mode */
676 (void)ifpromisc(priv->ifp, 0);
679 priv->autoSrcAddr = 1; /* reset auto-src-addr flag */
680 NG_NODE_REVIVE(node); /* Signal ng_rmnode we are persisant */
686 * Hook disconnection.
689 ng_ether_disconnect(hook_p hook)
691 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
693 if (hook == priv->upper) {
695 if (priv->ifp != NULL) /* restore h/w csum */
696 priv->ifp->if_hwassist = priv->hwassist;
697 } else if (hook == priv->lower)
699 else if (hook == priv->orphan)
702 panic("%s: weird hook", __func__);
703 if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
704 && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook))))
705 ng_rmnode_self(NG_HOOK_NODE(hook)); /* reset node */
709 /******************************************************************
711 ******************************************************************/
714 * Handle loading and unloading for this node type.
717 ng_ether_mod_event(module_t mod, int event, void *data)
727 /* Register function hooks */
728 if (ng_ether_attach_p != NULL) {
732 ng_ether_attach_p = ng_ether_attach;
733 ng_ether_detach_p = ng_ether_detach;
734 ng_ether_output_p = ng_ether_output;
735 ng_ether_input_p = ng_ether_input;
736 ng_ether_input_orphan_p = ng_ether_input_orphan;
737 ng_ether_link_state_p = ng_ether_link_state;
739 /* Create nodes for any already-existing Ethernet interfaces */
741 TAILQ_FOREACH(ifp, &ifnet, if_link) {
742 if (ifp->if_type == IFT_ETHER
743 || ifp->if_type == IFT_L2VLAN)
744 ng_ether_attach(ifp);
752 * Note that the base code won't try to unload us until
753 * all nodes have been removed, and that can't happen
754 * until all Ethernet interfaces are removed. In any
755 * case, we know there are no nodes left if the action
756 * is MOD_UNLOAD, so there's no need to detach any nodes.
759 /* Unregister function hooks */
760 ng_ether_attach_p = NULL;
761 ng_ether_detach_p = NULL;
762 ng_ether_output_p = NULL;
763 ng_ether_input_p = NULL;
764 ng_ether_input_orphan_p = NULL;
765 ng_ether_link_state_p = NULL;