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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 1.2 2003/06/17 04:28:49 dillon 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>
58 #include <net/if_types.h>
59 #include <net/if_arp.h>
60 #include <net/if_var.h>
61 #include <net/ethernet.h>
63 #include <netgraph/ng_message.h>
64 #include <netgraph/netgraph.h>
65 #include <netgraph/ng_parse.h>
66 #include <netgraph/ng_ether.h>
68 #define IFP2AC(IFP) ((struct arpcom *)IFP)
69 #define IFP2NG(ifp) ((struct ng_node *)((struct arpcom *)(ifp))->ac_netgraph)
71 /* Per-node private data */
73 struct ifnet *ifp; /* associated interface */
74 hook_p upper; /* upper hook connection */
75 hook_p lower; /* lower OR orphan hook connection */
76 u_char lowerOrphan; /* whether lower is lower or orphan */
77 u_char autoSrcAddr; /* always overwrite source address */
78 u_char promisc; /* promiscuous mode enabled */
79 u_long hwassist; /* hardware checksum capabilities */
81 typedef struct private *priv_p;
83 /* Functional hooks called from if_ethersubr.c */
84 static void ng_ether_input(struct ifnet *ifp,
85 struct mbuf **mp, struct ether_header *eh);
86 static void ng_ether_input_orphan(struct ifnet *ifp,
87 struct mbuf *m, 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, struct ether_header *eh);
95 static int ng_ether_glueback_header(struct mbuf **mp,
96 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.
208 * NOTE: this function will get called at splimp()
211 ng_ether_input(struct ifnet *ifp,
212 struct mbuf **mp, struct ether_header *eh)
214 const node_p node = IFP2NG(ifp);
215 const priv_p priv = node->private;
217 /* If "lower" hook not connected, let packet continue */
218 if (priv->lower == NULL || priv->lowerOrphan)
220 ng_ether_input2(node, mp, eh);
224 * Handle a packet that has come in on an interface, and which
225 * does not match any of our known protocols (an ``orphan'').
227 * NOTE: this function will get called at splimp()
230 ng_ether_input_orphan(struct ifnet *ifp,
231 struct mbuf *m, struct ether_header *eh)
233 const node_p node = IFP2NG(ifp);
234 const priv_p priv = node->private;
236 /* If "orphan" hook not connected, let packet continue */
237 if (priv->lower == NULL || !priv->lowerOrphan) {
241 ng_ether_input2(node, &m, eh);
247 * Handle a packet that has come in on an interface.
248 * The Ethernet header has already been detached from the mbuf,
249 * so we have to put it back.
251 * NOTE: this function will get called at splimp()
254 ng_ether_input2(node_p node, struct mbuf **mp, struct ether_header *eh)
256 const priv_p priv = node->private;
260 /* Glue Ethernet header back on */
261 if ((error = ng_ether_glueback_header(mp, eh)) != 0)
264 /* Send out lower/orphan hook */
265 (void)ng_queue_data(priv->lower, *mp, meta);
270 * Handle a packet that is going out on an interface.
271 * The Ethernet header is already attached to the mbuf.
274 ng_ether_output(struct ifnet *ifp, struct mbuf **mp)
276 const node_p node = IFP2NG(ifp);
277 const priv_p priv = node->private;
281 /* If "upper" hook not connected, let packet continue */
282 if (priv->upper == NULL)
285 /* Send it out "upper" hook */
286 NG_SEND_DATA(error, priv->upper, *mp, meta);
292 * A new Ethernet interface has been attached.
293 * Create a new node for it, etc.
296 ng_ether_attach(struct ifnet *ifp)
298 char name[IFNAMSIZ + 1];
303 KASSERT(!IFP2NG(ifp), ("%s: node already exists?", __FUNCTION__));
304 snprintf(name, sizeof(name), "%s%d", ifp->if_name, ifp->if_unit);
305 if (ng_make_node_common(&ng_ether_typestruct, &node) != 0) {
306 log(LOG_ERR, "%s: can't %s for %s\n",
307 __FUNCTION__, "create node", name);
311 /* Allocate private data */
312 MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_NOWAIT);
314 log(LOG_ERR, "%s: can't %s for %s\n",
315 __FUNCTION__, "allocate memory", name);
319 bzero(priv, sizeof(*priv));
320 node->private = priv;
323 priv->autoSrcAddr = 1;
324 priv->hwassist = ifp->if_hwassist;
326 /* Try to give the node the same name as the interface */
327 if (ng_name_node(node, name) != 0) {
328 log(LOG_WARNING, "%s: can't name node %s\n",
334 * An Ethernet interface is being detached.
338 ng_ether_detach(struct ifnet *ifp)
340 const node_p node = IFP2NG(ifp);
343 if (node == NULL) /* no node (why not?), ignore */
345 ng_rmnode(node); /* break all links to other nodes */
346 node->flags |= NG_INVALID;
347 ng_unname(node); /* free name (and its reference) */
348 IFP2NG(ifp) = NULL; /* detach node from interface */
349 priv = node->private; /* free node private info */
350 bzero(priv, sizeof(*priv));
351 FREE(priv, M_NETGRAPH);
352 node->private = NULL;
353 ng_unref(node); /* free node itself */
357 * Optimization for gluing the Ethernet header back onto
358 * the front of an incoming packet.
361 ng_ether_glueback_header(struct mbuf **mp, struct ether_header *eh)
363 struct mbuf *m = *mp;
367 * Optimize for the case where the header is already in place
368 * at the front of the mbuf. This is actually quite likely
369 * because many Ethernet drivers generate packets this way.
371 if (eh == mtod(m, struct ether_header *) - 1) {
372 m->m_len += sizeof(*eh);
373 m->m_data -= sizeof(*eh);
374 m->m_pkthdr.len += sizeof(*eh);
378 /* Prepend the header back onto the front of the mbuf */
379 M_PREPEND(m, sizeof(*eh), M_DONTWAIT);
385 /* Copy header into front of mbuf */
386 bcopy(eh, mtod(m, void *), sizeof(*eh));
394 /******************************************************************
395 NETGRAPH NODE METHODS
396 ******************************************************************/
399 * It is not possible or allowable to create a node of this type.
400 * Nodes get created when the interface is attached (or, when
401 * this node type's KLD is loaded).
404 ng_ether_constructor(node_p *nodep)
410 * Check for attaching a new hook.
413 ng_ether_newhook(node_p node, hook_p hook, const char *name)
415 const priv_p priv = node->private;
416 u_char orphan = priv->lowerOrphan;
419 /* Divert hook is an alias for lower */
420 if (strcmp(name, NG_ETHER_HOOK_DIVERT) == 0)
421 name = NG_ETHER_HOOK_LOWER;
424 if (strcmp(name, NG_ETHER_HOOK_UPPER) == 0)
425 hookptr = &priv->upper;
426 else if (strcmp(name, NG_ETHER_HOOK_LOWER) == 0) {
427 hookptr = &priv->lower;
429 } else if (strcmp(name, NG_ETHER_HOOK_ORPHAN) == 0) {
430 hookptr = &priv->lower;
435 /* Check if already connected (shouldn't be, but doesn't hurt) */
436 if (*hookptr != NULL)
439 /* Disable hardware checksums while 'upper' hook is connected */
440 if (hookptr == &priv->upper)
441 priv->ifp->if_hwassist = 0;
445 priv->lowerOrphan = orphan;
450 * Receive an incoming control message.
453 ng_ether_rcvmsg(node_p node, struct ng_mesg *msg,
454 const char *retaddr, struct ng_mesg **rptr)
456 const priv_p priv = node->private;
457 struct ng_mesg *resp = NULL;
460 switch (msg->header.typecookie) {
461 case NGM_ETHER_COOKIE:
462 switch (msg->header.cmd) {
463 case NGM_ETHER_GET_IFNAME:
464 NG_MKRESPONSE(resp, msg, IFNAMSIZ + 1, M_NOWAIT);
469 snprintf(resp->data, IFNAMSIZ + 1,
470 "%s%d", priv->ifp->if_name, priv->ifp->if_unit);
472 case NGM_ETHER_GET_IFINDEX:
473 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
478 *((u_int32_t *)resp->data) = priv->ifp->if_index;
480 case NGM_ETHER_GET_ENADDR:
481 NG_MKRESPONSE(resp, msg, ETHER_ADDR_LEN, M_NOWAIT);
486 bcopy((IFP2AC(priv->ifp))->ac_enaddr,
487 resp->data, ETHER_ADDR_LEN);
489 case NGM_ETHER_SET_ENADDR:
491 if (msg->header.arglen != ETHER_ADDR_LEN) {
495 error = if_setlladdr(priv->ifp,
496 (u_char *)msg->data, ETHER_ADDR_LEN);
499 case NGM_ETHER_GET_PROMISC:
500 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
505 *((u_int32_t *)resp->data) = priv->promisc;
507 case NGM_ETHER_SET_PROMISC:
511 if (msg->header.arglen != sizeof(u_int32_t)) {
515 want = !!*((u_int32_t *)msg->data);
516 if (want ^ priv->promisc) {
517 if ((error = ifpromisc(priv->ifp, want)) != 0)
519 priv->promisc = want;
523 case NGM_ETHER_GET_AUTOSRC:
524 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
529 *((u_int32_t *)resp->data) = priv->autoSrcAddr;
531 case NGM_ETHER_SET_AUTOSRC:
532 if (msg->header.arglen != sizeof(u_int32_t)) {
536 priv->autoSrcAddr = !!*((u_int32_t *)msg->data);
549 else if (resp != NULL)
550 FREE(resp, M_NETGRAPH);
551 FREE(msg, M_NETGRAPH);
556 * Receive data on a hook.
559 ng_ether_rcvdata(hook_p hook, struct mbuf *m, meta_p meta)
561 const node_p node = hook->node;
562 const priv_p priv = node->private;
564 if (hook == priv->lower)
565 return ng_ether_rcv_lower(node, m, meta);
566 if (hook == priv->upper)
567 return ng_ether_rcv_upper(node, m, meta);
568 panic("%s: weird hook", __FUNCTION__);
572 * Handle an mbuf received on the "lower" hook.
575 ng_ether_rcv_lower(node_p node, struct mbuf *m, meta_p meta)
577 const priv_p priv = node->private;
578 struct ifnet *const ifp = priv->ifp;
580 /* Discard meta info */
583 /* Check whether interface is ready for packets */
584 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) {
589 /* Make sure header is fully pulled up */
590 if (m->m_pkthdr.len < sizeof(struct ether_header)) {
594 if (m->m_len < sizeof(struct ether_header)
595 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL)
598 /* Drop in the MAC address if desired */
599 if (priv->autoSrcAddr) {
601 /* Make the mbuf writable if it's not already */
603 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL)
606 /* Overwrite source MAC address */
607 bcopy((IFP2AC(ifp))->ac_enaddr,
608 mtod(m, struct ether_header *)->ether_shost,
612 /* Send it on its way */
613 return ether_output_frame(ifp, m);
617 * Handle an mbuf received on the "upper" hook.
620 ng_ether_rcv_upper(node_p node, struct mbuf *m, meta_p meta)
622 const priv_p priv = node->private;
623 struct ether_header *eh;
625 /* Discard meta info */
628 /* Check length and pull off header */
629 if (m->m_pkthdr.len < sizeof(*eh)) {
633 if (m->m_len < sizeof(*eh) && (m = m_pullup(m, sizeof(*eh))) == NULL)
635 eh = mtod(m, struct ether_header *);
636 m->m_data += sizeof(*eh);
637 m->m_len -= sizeof(*eh);
638 m->m_pkthdr.len -= sizeof(*eh);
639 m->m_pkthdr.rcvif = priv->ifp;
641 /* Route packet back in */
642 ether_demux(priv->ifp, eh, m);
647 * Shutdown node. This resets the node but does not remove it.
650 ng_ether_rmnode(node_p node)
652 const priv_p priv = node->private;
655 node->flags &= ~NG_INVALID; /* bounce back to life */
656 if (priv->promisc) { /* disable promiscuous mode */
657 (void)ifpromisc(priv->ifp, 0);
660 priv->autoSrcAddr = 1; /* reset auto-src-addr flag */
665 * Hook disconnection.
668 ng_ether_disconnect(hook_p hook)
670 const priv_p priv = hook->node->private;
672 if (hook == priv->upper) {
674 priv->ifp->if_hwassist = priv->hwassist; /* restore h/w csum */
675 } else if (hook == priv->lower) {
677 priv->lowerOrphan = 0;
679 panic("%s: weird hook", __FUNCTION__);
680 if (hook->node->numhooks == 0)
681 ng_rmnode(hook->node); /* reset node */
686 ng_enaddr_parse(const struct ng_parse_type *type,
687 const char *s, int *const off, const u_char *const start,
688 u_char *const buf, int *const buflen)
694 if (*buflen < ETHER_ADDR_LEN)
696 for (i = 0; i < ETHER_ADDR_LEN; i++) {
697 val = strtoul(s + *off, &eptr, 16);
698 if (val > 0xff || eptr == s + *off)
700 buf[i] = (u_char)val;
702 if (i < ETHER_ADDR_LEN - 1) {
708 *buflen = ETHER_ADDR_LEN;
713 ng_enaddr_unparse(const struct ng_parse_type *type,
714 const u_char *data, int *off, char *cbuf, int cbuflen)
718 len = snprintf(cbuf, cbuflen, "%02x:%02x:%02x:%02x:%02x:%02x",
719 data[*off], data[*off + 1], data[*off + 2],
720 data[*off + 3], data[*off + 4], data[*off + 5]);
723 *off += ETHER_ADDR_LEN;
727 /******************************************************************
729 ******************************************************************/
732 * Handle loading and unloading for this node type.
735 ng_ether_mod_event(module_t mod, int event, void *data)
745 /* Register function hooks */
746 if (ng_ether_attach_p != NULL) {
750 ng_ether_attach_p = ng_ether_attach;
751 ng_ether_detach_p = ng_ether_detach;
752 ng_ether_output_p = ng_ether_output;
753 ng_ether_input_p = ng_ether_input;
754 ng_ether_input_orphan_p = ng_ether_input_orphan;
756 /* Create nodes for any already-existing Ethernet interfaces */
757 TAILQ_FOREACH(ifp, &ifnet, if_link) {
758 if (ifp->if_type == IFT_ETHER ||
759 ifp->if_type == IFT_L2VLAN)
760 ng_ether_attach(ifp);
767 * Note that the base code won't try to unload us until
768 * all nodes have been removed, and that can't happen
769 * until all Ethernet interfaces are removed. In any
770 * case, we know there are no nodes left if the action
771 * is MOD_UNLOAD, so there's no need to detach any nodes.
774 /* Unregister function hooks */
775 ng_ether_attach_p = NULL;
776 ng_ether_detach_p = NULL;
777 ng_ether_output_p = NULL;
778 ng_ether_input_p = NULL;
779 ng_ether_input_orphan_p = NULL;