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37 * Author: Archie Cobbs <archie@freebsd.org>
40 * $Whistle: ng_iface.c,v 1.33 1999/11/01 09:24:51 julian Exp $
44 * This node is also a system networking interface. It has
45 * a hook for each protocol (IP, AppleTalk, IPX, etc). Packets
46 * are simply relayed between the interface and the hooks.
48 * Interfaces are named ng0, ng1, etc. New nodes take the
49 * first available interface name.
51 * This node also includes Berkeley packet filter support.
54 #include <sys/param.h>
55 #include <sys/systm.h>
56 #include <sys/errno.h>
57 #include <sys/kernel.h>
58 #include <sys/malloc.h>
60 #include <sys/errno.h>
61 #include <sys/sockio.h>
62 #include <sys/socket.h>
63 #include <sys/syslog.h>
64 #include <sys/libkern.h>
67 #include <net/if_types.h>
68 #include <net/intrq.h>
71 #include <netinet/in.h>
73 #include <netgraph/ng_message.h>
74 #include <netgraph/netgraph.h>
75 #include <netgraph/ng_parse.h>
76 #include <netgraph/ng_iface.h>
77 #include <netgraph/ng_cisco.h>
79 #ifdef NG_SEPARATE_MALLOC
80 MALLOC_DEFINE(M_NETGRAPH_IFACE, "netgraph_iface", "netgraph iface node ");
82 #define M_NETGRAPH_IFACE M_NETGRAPH
85 /* This struct describes one address family */
87 sa_family_t family; /* Address family */
88 const char *hookname; /* Name for hook */
90 typedef const struct iffam *iffam_p;
92 /* List of address families supported by our interface */
93 const static struct iffam gFamilies[] = {
94 { AF_INET, NG_IFACE_HOOK_INET },
95 { AF_INET6, NG_IFACE_HOOK_INET6 },
96 { AF_APPLETALK, NG_IFACE_HOOK_ATALK },
97 { AF_IPX, NG_IFACE_HOOK_IPX },
98 { AF_ATM, NG_IFACE_HOOK_ATM },
99 { AF_NATM, NG_IFACE_HOOK_NATM },
100 { AF_NS, NG_IFACE_HOOK_NS },
102 #define NUM_FAMILIES (sizeof(gFamilies) / sizeof(*gFamilies))
104 /* Node private data */
105 struct ng_iface_private {
106 struct ifnet *ifp; /* Our interface */
107 int unit; /* Interface unit number */
108 node_p node; /* Our netgraph node */
109 hook_p hooks[NUM_FAMILIES]; /* Hook for each address family */
111 typedef struct ng_iface_private *priv_p;
113 /* Interface methods */
114 static void ng_iface_start(struct ifnet *ifp);
115 static int ng_iface_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data);
116 static int ng_iface_output(struct ifnet *ifp, struct mbuf *m0,
117 struct sockaddr *dst, struct rtentry *rt0);
118 static void ng_iface_bpftap(struct ifnet *ifp,
119 struct mbuf *m, sa_family_t family);
121 static void ng_iface_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data);
124 /* Netgraph methods */
125 static ng_constructor_t ng_iface_constructor;
126 static ng_rcvmsg_t ng_iface_rcvmsg;
127 static ng_shutdown_t ng_iface_shutdown;
128 static ng_newhook_t ng_iface_newhook;
129 static ng_rcvdata_t ng_iface_rcvdata;
130 static ng_disconnect_t ng_iface_disconnect;
133 static iffam_p get_iffam_from_af(sa_family_t family);
134 static iffam_p get_iffam_from_hook(priv_p priv, hook_p hook);
135 static iffam_p get_iffam_from_name(const char *name);
136 static hook_p *get_hook_from_iffam(priv_p priv, iffam_p iffam);
138 /* Parse type for struct ng_iface_ifname */
139 static const struct ng_parse_fixedstring_info ng_iface_ifname_info = {
140 NG_IFACE_IFACE_NAME_MAX + 1
142 static const struct ng_parse_type ng_iface_ifname_type = {
143 &ng_parse_fixedstring_type,
144 &ng_iface_ifname_info
147 /* Parse type for struct ng_cisco_ipaddr */
148 static const struct ng_parse_struct_field ng_cisco_ipaddr_type_fields[]
149 = NG_CISCO_IPADDR_TYPE_INFO;
150 static const struct ng_parse_type ng_cisco_ipaddr_type = {
151 &ng_parse_struct_type,
152 &ng_cisco_ipaddr_type_fields
155 /* List of commands and how to convert arguments to/from ASCII */
156 static const struct ng_cmdlist ng_iface_cmds[] = {
159 NGM_IFACE_GET_IFNAME,
162 &ng_iface_ifname_type
166 NGM_IFACE_POINT2POINT,
180 NGM_CISCO_GET_IPADDR,
183 &ng_cisco_ipaddr_type
188 /* Node type descriptor */
189 static struct ng_type typestruct = {
193 ng_iface_constructor,
203 NETGRAPH_INIT(iface, &typestruct);
205 /* We keep a bitmap indicating which unit numbers are free.
206 One means the unit number is free, zero means it's taken. */
207 static int *ng_iface_units = NULL;
208 static int ng_iface_units_len = 0;
209 static int ng_units_in_use = 0;
211 #define UNITS_BITSPERWORD (sizeof(*ng_iface_units) * NBBY)
213 /************************************************************************
215 ************************************************************************/
218 * Get the family descriptor from the family ID
220 static __inline__ iffam_p
221 get_iffam_from_af(sa_family_t family)
226 for (k = 0; k < NUM_FAMILIES; k++) {
227 iffam = &gFamilies[k];
228 if (iffam->family == family)
235 * Get the family descriptor from the hook
237 static __inline__ iffam_p
238 get_iffam_from_hook(priv_p priv, hook_p hook)
242 for (k = 0; k < NUM_FAMILIES; k++)
243 if (priv->hooks[k] == hook)
244 return (&gFamilies[k]);
249 * Get the hook from the iffam descriptor
252 static __inline__ hook_p *
253 get_hook_from_iffam(priv_p priv, iffam_p iffam)
255 return (&priv->hooks[iffam - gFamilies]);
259 * Get the iffam descriptor from the name
261 static __inline__ iffam_p
262 get_iffam_from_name(const char *name)
267 for (k = 0; k < NUM_FAMILIES; k++) {
268 iffam = &gFamilies[k];
269 if (!strcmp(iffam->hookname, name))
276 * Find the first free unit number for a new interface.
277 * Increase the size of the unit bitmap as necessary.
279 static __inline__ int
280 ng_iface_get_unit(int *unit)
284 for (index = 0; index < ng_iface_units_len
285 && ng_iface_units[index] == 0; index++);
286 if (index == ng_iface_units_len) { /* extend array */
287 int i, *newarray, newlen;
289 newlen = (2 * ng_iface_units_len) + 4;
290 MALLOC(newarray, int *, newlen * sizeof(*ng_iface_units),
291 M_NETGRAPH_IFACE, M_NOWAIT);
292 if (newarray == NULL)
294 bcopy(ng_iface_units, newarray,
295 ng_iface_units_len * sizeof(*ng_iface_units));
296 for (i = ng_iface_units_len; i < newlen; i++)
298 if (ng_iface_units != NULL)
299 FREE(ng_iface_units, M_NETGRAPH_IFACE);
300 ng_iface_units = newarray;
301 ng_iface_units_len = newlen;
303 bit = ffs(ng_iface_units[index]) - 1;
304 KASSERT(bit >= 0 && bit <= UNITS_BITSPERWORD - 1,
305 ("%s: word=%d bit=%d", __func__, ng_iface_units[index], bit));
306 ng_iface_units[index] &= ~(1 << bit);
307 *unit = (index * UNITS_BITSPERWORD) + bit;
313 * Free a no longer needed unit number.
315 static __inline__ void
316 ng_iface_free_unit(int unit)
320 index = unit / UNITS_BITSPERWORD;
321 bit = unit % UNITS_BITSPERWORD;
322 KASSERT(index < ng_iface_units_len,
323 ("%s: unit=%d len=%d", __func__, unit, ng_iface_units_len));
324 KASSERT((ng_iface_units[index] & (1 << bit)) == 0,
325 ("%s: unit=%d is free", __func__, unit));
326 ng_iface_units[index] |= (1 << bit);
328 * XXX We could think about reducing the size of ng_iface_units[]
329 * XXX here if the last portion is all ones
330 * XXX At least free it if no more units.
331 * Needed if we are to eventually be able to unload.
334 if (ng_units_in_use == 0) { /* XXX make SMP safe */
335 FREE(ng_iface_units, M_NETGRAPH_IFACE);
336 ng_iface_units_len = 0;
337 ng_iface_units = NULL;
341 /************************************************************************
343 ************************************************************************/
346 * Process an ioctl for the virtual interface
349 ng_iface_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
351 struct ifreq *const ifr = (struct ifreq *) data;
355 ng_iface_print_ioctl(ifp, command, data);
360 /* These two are mostly handled at a higher layer */
362 ifp->if_flags |= (IFF_UP | IFF_RUNNING);
363 ifp->if_flags &= ~(IFF_OACTIVE);
371 * If the interface is marked up and stopped, then start it.
372 * If it is marked down and running, then stop it.
374 if (ifr->ifr_flags & IFF_UP) {
375 if (!(ifp->if_flags & IFF_RUNNING)) {
376 ifp->if_flags &= ~(IFF_OACTIVE);
377 ifp->if_flags |= IFF_RUNNING;
380 if (ifp->if_flags & IFF_RUNNING)
381 ifp->if_flags &= ~(IFF_RUNNING | IFF_OACTIVE);
385 /* Set the interface MTU */
387 if (ifr->ifr_mtu > NG_IFACE_MTU_MAX
388 || ifr->ifr_mtu < NG_IFACE_MTU_MIN)
391 ifp->if_mtu = ifr->ifr_mtu;
394 /* Stuff that's not supported */
412 * This routine is called to deliver a packet out the interface.
413 * We simply look at the address family and relay the packet to
414 * the corresponding hook, if it exists and is connected.
418 ng_iface_output(struct ifnet *ifp, struct mbuf *m,
419 struct sockaddr *dst, struct rtentry *rt0)
421 const priv_p priv = (priv_p) ifp->if_softc;
422 const iffam_p iffam = get_iffam_from_af(dst->sa_family);
426 /* Check interface flags */
427 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) {
432 /* BPF writes need to be handled specially */
433 if (dst->sa_family == AF_UNSPEC) {
434 if (m->m_len < 4 && (m = m_pullup(m, 4)) == NULL)
436 dst->sa_family = (sa_family_t)*mtod(m, int32_t *);
439 m->m_pkthdr.len -= 4;
442 /* Berkeley packet filter */
443 ng_iface_bpftap(ifp, m, dst->sa_family);
445 /* Check address family to determine hook (if known) */
448 log(LOG_WARNING, "%s%d: can't handle af%d\n",
449 ifp->if_name, ifp->if_unit, (int)dst->sa_family);
450 return (EAFNOSUPPORT);
453 /* Copy length before the mbuf gets invalidated */
454 len = m->m_pkthdr.len;
456 /* Send packet; if hook is not connected, mbuf will get freed. */
457 NG_SEND_DATA(error, *get_hook_from_iffam(priv, iffam), m, meta);
461 ifp->if_obytes += len;
468 * This routine should never be called
472 ng_iface_start(struct ifnet *ifp)
474 printf("%s%d: %s called?", ifp->if_name, ifp->if_unit, __func__);
478 * Flash a packet by the BPF (requires prepending 4 byte AF header)
479 * Note the phoney mbuf; this is OK because BPF treats it read-only.
482 ng_iface_bpftap(struct ifnet *ifp, struct mbuf *m, sa_family_t family)
484 int32_t family4 = (int32_t)family;
487 KASSERT(family != AF_UNSPEC, ("%s: family=AF_UNSPEC", __func__));
488 if (ifp->if_bpf != NULL) {
489 bzero(&m0, sizeof(m0));
491 m0.m_len = sizeof(family4);
492 m0.m_data = (char *)&family4;
499 * Display an ioctl to the virtual interface
503 ng_iface_print_ioctl(struct ifnet *ifp, int command, caddr_t data)
507 switch (command & IOC_DIRMASK) {
523 log(LOG_DEBUG, "%s%d: %s('%c', %d, char[%d])\n",
524 ifp->if_name, ifp->if_unit,
528 IOCPARM_LEN(command));
532 /************************************************************************
534 ************************************************************************/
537 * Constructor for a node
540 ng_iface_constructor(node_p node)
542 char ifname[NG_IFACE_IFACE_NAME_MAX + 1];
547 /* Allocate node and interface private structures */
548 MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH_IFACE, M_NOWAIT|M_ZERO);
551 MALLOC(ifp, struct ifnet *, sizeof(*ifp), M_NETGRAPH_IFACE, M_NOWAIT|M_ZERO);
553 FREE(priv, M_NETGRAPH_IFACE);
557 /* Link them together */
558 ifp->if_softc = priv;
561 /* Get an interface unit number */
562 if ((error = ng_iface_get_unit(&priv->unit)) != 0) {
563 FREE(ifp, M_NETGRAPH_IFACE);
564 FREE(priv, M_NETGRAPH_IFACE);
568 /* Link together node and private info */
569 NG_NODE_SET_PRIVATE(node, priv);
572 /* Initialize interface structure */
573 ifp->if_name = NG_IFACE_IFACE_NAME;
574 ifp->if_unit = priv->unit;
575 ifp->if_output = ng_iface_output;
576 ifp->if_start = ng_iface_start;
577 ifp->if_ioctl = ng_iface_ioctl;
578 ifp->if_watchdog = NULL;
579 ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;
580 ifp->if_mtu = NG_IFACE_MTU_DEFAULT;
581 ifp->if_flags = (IFF_SIMPLEX|IFF_POINTOPOINT|IFF_NOARP|IFF_MULTICAST);
582 ifp->if_type = IFT_PROPVIRTUAL; /* XXX */
583 ifp->if_addrlen = 0; /* XXX */
584 ifp->if_hdrlen = 0; /* XXX */
585 ifp->if_baudrate = 64000; /* XXX */
586 TAILQ_INIT(&ifp->if_addrhead);
588 /* Give this node the same name as the interface (if possible) */
589 bzero(ifname, sizeof(ifname));
590 snprintf(ifname, sizeof(ifname), "%s%d", ifp->if_name, ifp->if_unit);
591 if (ng_name_node(node, ifname) != 0)
592 log(LOG_WARNING, "%s: can't acquire netgraph name\n", ifname);
594 /* Attach the interface */
596 bpfattach(ifp, DLT_NULL, sizeof(u_int));
603 * Give our ok for a hook to be added
606 ng_iface_newhook(node_p node, hook_p hook, const char *name)
608 const iffam_p iffam = get_iffam_from_name(name);
612 return (EPFNOSUPPORT);
613 hookptr = get_hook_from_iffam(NG_NODE_PRIVATE(node), iffam);
614 if (*hookptr != NULL)
621 * Receive a control message
624 ng_iface_rcvmsg(node_p node, item_p item, hook_p lasthook)
626 const priv_p priv = NG_NODE_PRIVATE(node);
627 struct ifnet *const ifp = priv->ifp;
628 struct ng_mesg *resp = NULL;
632 NGI_GET_MSG(item, msg);
633 switch (msg->header.typecookie) {
634 case NGM_IFACE_COOKIE:
635 switch (msg->header.cmd) {
636 case NGM_IFACE_GET_IFNAME:
638 struct ng_iface_ifname *arg;
640 NG_MKRESPONSE(resp, msg, sizeof(*arg), M_NOWAIT);
645 arg = (struct ng_iface_ifname *)resp->data;
646 snprintf(arg->ngif_name, sizeof(arg->ngif_name),
647 "%s%d", ifp->if_name, ifp->if_unit);
651 case NGM_IFACE_POINT2POINT:
652 case NGM_IFACE_BROADCAST:
655 /* Deny request if interface is UP */
656 if ((ifp->if_flags & IFF_UP) != 0)
660 switch (msg->header.cmd) {
661 case NGM_IFACE_POINT2POINT:
662 ifp->if_flags |= IFF_POINTOPOINT;
663 ifp->if_flags &= ~IFF_BROADCAST;
665 case NGM_IFACE_BROADCAST:
666 ifp->if_flags &= ~IFF_POINTOPOINT;
667 ifp->if_flags |= IFF_BROADCAST;
678 case NGM_CISCO_COOKIE:
679 switch (msg->header.cmd) {
680 case NGM_CISCO_GET_IPADDR: /* we understand this too */
684 /* Return the first configured IP address */
685 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
686 struct ng_cisco_ipaddr *ips;
688 if (ifa->ifa_addr->sa_family != AF_INET)
690 NG_MKRESPONSE(resp, msg, sizeof(ips), M_NOWAIT);
695 ips = (struct ng_cisco_ipaddr *)resp->data;
696 ips->ipaddr = ((struct sockaddr_in *)
697 ifa->ifa_addr)->sin_addr;
698 ips->netmask = ((struct sockaddr_in *)
699 ifa->ifa_netmask)->sin_addr;
703 /* No IP addresses on this interface? */
705 error = EADDRNOTAVAIL;
717 NG_RESPOND_MSG(error, node, item, resp);
723 * Recive data from a hook. Pass the packet to the correct input routine.
726 ng_iface_rcvdata(hook_p hook, item_p item)
728 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
729 const iffam_p iffam = get_iffam_from_hook(priv, hook);
730 struct ifnet *const ifp = priv->ifp;
736 KASSERT(iffam != NULL, ("%s: iffam", __func__));
737 KASSERT(m->m_flags & M_PKTHDR, ("%s: not pkthdr", __func__));
740 if ((ifp->if_flags & IFF_UP) == 0) {
745 /* Update interface stats */
747 ifp->if_ibytes += m->m_pkthdr.len;
749 /* Note receiving interface */
750 m->m_pkthdr.rcvif = ifp;
752 /* Berkeley packet filter */
753 ng_iface_bpftap(ifp, m, iffam->family);
756 return family_enqueue(iffam->family, m);
760 * Shutdown and remove the node and its associated interface.
763 ng_iface_shutdown(node_p node)
765 const priv_p priv = NG_NODE_PRIVATE(node);
767 bpfdetach(priv->ifp);
768 if_detach(priv->ifp);
769 FREE(priv->ifp, M_NETGRAPH_IFACE);
771 ng_iface_free_unit(priv->unit);
772 FREE(priv, M_NETGRAPH_IFACE);
773 NG_NODE_SET_PRIVATE(node, NULL);
779 * Hook disconnection. Note that we do *not* shutdown when all
780 * hooks have been disconnected.
783 ng_iface_disconnect(hook_p hook)
785 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
786 const iffam_p iffam = get_iffam_from_hook(priv, hook);
790 *get_hook_from_iffam(priv, iffam) = NULL;