xref: /illumos-gate/usr/src/lib/libipadm/common/ipadm_if.c (revision 3ee592424ed4bb7b850d9adccb9f3c493ce7534b)
1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License (the "License").
6  * You may not use this file except in compliance with the License.
7  *
8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9  * or http://www.opensolaris.org/os/licensing.
10  * See the License for the specific language governing permissions
11  * and limitations under the License.
12  *
13  * When distributing Covered Code, include this CDDL HEADER in each
14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15  * If applicable, add the following below this CDDL HEADER, with the
16  * fields enclosed by brackets "[]" replaced with your own identifying
17  * information: Portions Copyright [yyyy] [name of copyright owner]
18  *
19  * CDDL HEADER END
20  */
21 
22 /*
23  * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
24  * Copyright 2021 Tintri by DDN, Inc. All rights reserved.
25  */
26 
27 #include <errno.h>
28 #include <sys/sockio.h>
29 #include <sys/list.h>
30 #include <string.h>
31 #include <assert.h>
32 #include <unistd.h>
33 #include <stropts.h>
34 #include <strings.h>
35 #include <libdlpi.h>
36 #include <libdllink.h>
37 #include <libinetutil.h>
38 #include <inet/ip.h>
39 #include <limits.h>
40 #include <zone.h>
41 #include <ipadm_ndpd.h>
42 #include <ipmp_query.h>
43 #include "libipadm_impl.h"
44 
45 static ipadm_status_t	i_ipadm_slifname_arp(char *, uint64_t, int);
46 static ipadm_status_t	i_ipadm_slifname(ipadm_handle_t, char *, char *,
47 			    uint64_t, int, uint32_t);
48 static ipadm_status_t	i_ipadm_create_ipmp_peer(ipadm_handle_t, char *,
49 			    sa_family_t);
50 static ipadm_status_t	i_ipadm_persist_if(ipadm_handle_t, const char *,
51 			    sa_family_t, uint32_t);
52 static ipadm_status_t   i_ipadm_allocate_ifinfo(ipadm_if_info_t **);
53 static ipadm_status_t	i_ipadm_get_db_if(ipadm_handle_t, const char *,
54 			    nvlist_t **);
55 static ipadm_status_t i_ipadm_nvl2ifinfo(nvlist_t *, ipadm_if_info_t **);
56 static ipadm_status_t i_ipadm_fill_cmembers(char *, ipadm_ipmp_members_t *);
57 static ipadm_status_t i_ipadm_fill_pmembers(nvlist_t *, ipadm_ipmp_members_t *);
58 static ipadm_status_t i_ipadm_add_persistent_if_info(ipadm_if_info_t *,
59 		    ipadm_if_info_t *);
60 static void i_ipadm_free_ipmp_members(ipadm_ipmp_members_t *);
61 static ipadm_status_t i_ipadm_persist_update_ipmp(ipadm_handle_t, const char *,
62 	const char *,
63 	ipadm_ipmp_op_t);
64 static ipadm_status_t i_ipadm_update_ipmp(ipadm_handle_t, const char *,
65 	const char *, uint32_t,
66 	ipadm_ipmp_op_t);
67 
68 /*
69  * Returns B_FALSE if the interface in `ifname' has at least one address that is
70  * IFF_UP in the addresses in `ifa'.
71  */
72 static boolean_t
i_ipadm_is_if_down(char * ifname,struct ifaddrs * ifa)73 i_ipadm_is_if_down(char *ifname, struct ifaddrs *ifa)
74 {
75 	struct ifaddrs	*ifap;
76 	char		cifname[LIFNAMSIZ];
77 	char		*sep;
78 
79 	for (ifap = ifa; ifap != NULL; ifap = ifap->ifa_next) {
80 		(void) strlcpy(cifname, ifap->ifa_name, sizeof (cifname));
81 		if ((sep = strrchr(cifname, IPADM_LOGICAL_SEP)) != NULL)
82 			*sep = '\0';
83 		/*
84 		 * If this condition is true, there is at least one
85 		 * address that is IFF_UP. So, we need to return B_FALSE.
86 		 */
87 		if (strcmp(cifname, ifname) == 0 &&
88 		    (ifap->ifa_flags & IFF_UP)) {
89 			return (B_FALSE);
90 		}
91 	}
92 	/* We did not find any IFF_UP addresses. */
93 	return (B_TRUE);
94 }
95 
96 /*
97  * Retrieves the information for the interface `ifname' from active
98  * config if `ifname' is specified and returns the result in the list `if_info'.
99  * Otherwise, it retrieves the information for all the interfaces in
100  * the active config and returns the result in the list `if_info'.
101  */
102 static ipadm_status_t
i_ipadm_active_if_info(ipadm_handle_t iph,const char * ifname,ipadm_if_info_t ** if_info,int64_t lifc_flags)103 i_ipadm_active_if_info(ipadm_handle_t iph, const char *ifname,
104     ipadm_if_info_t **if_info, int64_t lifc_flags)
105 {
106 	struct lifreq	*buf;
107 	struct lifreq	*lifrp;
108 	struct lifreq	lifrl;
109 	ipadm_if_info_t	*last = NULL;
110 	ipadm_if_info_t	*ifp;
111 	int		s;
112 	int		n;
113 	int		numifs;
114 	ipadm_status_t	status = IPADM_SUCCESS;
115 
116 	*if_info = NULL;
117 	/*
118 	 * Get information for all interfaces.
119 	 */
120 	if (getallifs(iph->iph_sock, 0, &buf, &numifs, lifc_flags) != 0)
121 		return (ipadm_errno2status(errno));
122 
123 	lifrp = buf;
124 	for (n = 0; n < numifs; n++, lifrp++) {
125 		/* Skip interfaces with logical num != 0 */
126 		if (i_ipadm_get_lnum(lifrp->lifr_name) != 0)
127 			continue;
128 		/*
129 		 * Skip the current interface if a specific `ifname' has
130 		 * been requested and current interface does not match
131 		 * `ifname'.
132 		 */
133 		if (ifname != NULL && strcmp(lifrp->lifr_name, ifname) != 0)
134 			continue;
135 		/*
136 		 * Check if the interface already exists in our list.
137 		 * If it already exists, we need to update its flags.
138 		 */
139 		for (ifp = *if_info; ifp != NULL; ifp = ifp->ifi_next) {
140 			if (strcmp(lifrp->lifr_name, ifp->ifi_name) == 0)
141 				break;
142 		}
143 		if (ifp == NULL) {
144 			if ((status =
145 			    i_ipadm_allocate_ifinfo(&ifp)) != IPADM_SUCCESS)
146 					break;
147 
148 			(void) strlcpy(ifp->ifi_name, lifrp->lifr_name,
149 			    sizeof (ifp->ifi_name));
150 			/* Update the `ifi_next' pointer for this new node */
151 			if (*if_info == NULL)
152 				*if_info = ifp;
153 			else
154 				last->ifi_next = ifp;
155 			last = ifp;
156 		}
157 
158 		/*
159 		 * Retrieve the flags for the interface by doing a
160 		 * SIOCGLIFFLAGS to populate the `ifi_cflags' field.
161 		 */
162 		(void) strlcpy(lifrl.lifr_name,
163 		    lifrp->lifr_name, sizeof (lifrl.lifr_name));
164 		s = (lifrp->lifr_addr.ss_family == AF_INET) ?
165 		    iph->iph_sock : iph->iph_sock6;
166 		if (ioctl(s, SIOCGLIFFLAGS, (caddr_t)&lifrl) < 0)
167 			continue;
168 
169 		/* a regular interface by default */
170 		ifp->ifi_class = IPADM_IF_CLASS_REGULAR;
171 
172 		if (lifrl.lifr_flags & IFF_BROADCAST)
173 			ifp->ifi_cflags |= IFIF_BROADCAST;
174 		if (lifrl.lifr_flags & IFF_MULTICAST)
175 			ifp->ifi_cflags |= IFIF_MULTICAST;
176 		if (lifrl.lifr_flags & IFF_POINTOPOINT)
177 			ifp->ifi_cflags |= IFIF_POINTOPOINT;
178 		if (lifrl.lifr_flags & IFF_VIRTUAL) {
179 			ifp->ifi_cflags |= IFIF_VIRTUAL;
180 			ifp->ifi_class = IPADM_IF_CLASS_VIRTUAL;
181 		}
182 		if (lifrl.lifr_flags & IFF_IPMP) {
183 			ifp->ifi_cflags |= IFIF_IPMP;
184 			ifp->ifi_class = IPADM_IF_CLASS_IPMP;
185 		}
186 		if (lifrl.lifr_flags & IFF_STANDBY)
187 			ifp->ifi_cflags |= IFIF_STANDBY;
188 		if (lifrl.lifr_flags & IFF_INACTIVE)
189 			ifp->ifi_cflags |= IFIF_INACTIVE;
190 		if (lifrl.lifr_flags & IFF_VRRP)
191 			ifp->ifi_cflags |= IFIF_VRRP;
192 		if (lifrl.lifr_flags & IFF_NOACCEPT)
193 			ifp->ifi_cflags |= IFIF_NOACCEPT;
194 		if (lifrl.lifr_flags & IFF_IPV4)
195 			ifp->ifi_cflags |= IFIF_IPV4;
196 		if (lifrl.lifr_flags & IFF_IPV6)
197 			ifp->ifi_cflags |= IFIF_IPV6;
198 		if (lifrl.lifr_flags & IFF_L3PROTECT)
199 			ifp->ifi_cflags |= IFIF_L3PROTECT;
200 
201 		/*
202 		 * Retrieve active IPMP members. This may fail in in.mpathd if
203 		 * the IPMP interface has just been created with no members.
204 		 * Hence, ignore errors, cmembers will just be empty.
205 		 */
206 		if (ifp->ifi_class == IPADM_IF_CLASS_IPMP) {
207 			if (ioctl(s, SIOCGLIFGROUPNAME, (caddr_t)&lifrl) == 0) {
208 				(void) i_ipadm_fill_cmembers(
209 				    lifrl.lifr_groupname,
210 				    &ifp->ifi_ipmp_cmembers);
211 			}
212 		}
213 	}
214 	free(buf);
215 	if (status != IPADM_SUCCESS) {
216 		ipadm_free_if_info(*if_info);
217 		*if_info = NULL;
218 	}
219 	return (status);
220 }
221 
222 /*
223  * Returns the interface information for `ifname' in `if_info' from persistent
224  * config if `ifname' is non-null. Otherwise, it returns all the interfaces
225  * from persistent config in `if_info'.
226  */
227 static ipadm_status_t
i_ipadm_persist_if_info(ipadm_handle_t iph,const char * ifname,ipadm_if_info_t ** if_info)228 i_ipadm_persist_if_info(ipadm_handle_t iph, const char *ifname,
229     ipadm_if_info_t **if_info)
230 {
231 	ipadm_status_t	status = IPADM_SUCCESS;
232 	nvlist_t	*ifs_info_nvl;
233 
234 	*if_info = NULL;
235 
236 	if ((status = i_ipadm_get_db_if(iph,
237 	    ifname, &ifs_info_nvl)) != IPADM_SUCCESS)
238 		return (status);
239 
240 	assert(ifs_info_nvl != NULL);
241 
242 	return (i_ipadm_nvl2ifinfo(ifs_info_nvl, if_info));
243 }
244 
245 static ipadm_status_t
i_ipadm_nvl2ifinfo(nvlist_t * ifs_info_nvl,ipadm_if_info_t ** if_info)246 i_ipadm_nvl2ifinfo(nvlist_t *ifs_info_nvl, ipadm_if_info_t **if_info)
247 {
248 	ipadm_if_info_t *ific = NULL, *ifil = NULL;
249 	nvlist_t	*if_info_nvl;
250 	nvpair_t	*nvp;
251 	char		*strval;
252 	ipadm_status_t	status = IPADM_SUCCESS;
253 	uint16_t	*families;
254 	uint_t		nelem = 0;
255 
256 	for (nvp = nvlist_next_nvpair(ifs_info_nvl, NULL); nvp != NULL;
257 	    nvp = nvlist_next_nvpair(ifs_info_nvl, nvp)) {
258 		if (nvpair_value_nvlist(nvp, &if_info_nvl) != 0)
259 			continue;
260 
261 		status = i_ipadm_allocate_ifinfo(&ific);
262 		if (status != IPADM_SUCCESS) {
263 			ipadm_free_if_info(*if_info);
264 			break;
265 		}
266 		if (nvlist_lookup_string(if_info_nvl, IPADM_NVP_IFNAME,
267 		    &strval) != 0) {
268 			ipadm_free_if_info(ific);
269 			ific = NULL;
270 			continue;
271 		}
272 		(void) strlcpy(ific->ifi_name, strval,
273 		    sizeof (ific->ifi_name));
274 
275 		if (nvlist_lookup_uint16_array(if_info_nvl,
276 		    IPADM_NVP_FAMILIES, &families, &nelem) == 0) {
277 			while (nelem-- > 0) {
278 				if (families[nelem] == AF_INET)
279 					ific->ifi_pflags |= IFIF_IPV4;
280 				else if (families[nelem] == AF_INET6)
281 					ific->ifi_pflags |= IFIF_IPV6;
282 			}
283 		}
284 
285 		if (nvlist_lookup_string(if_info_nvl,
286 		    IPADM_NVP_IFCLASS, &strval) == 0)
287 			ific->ifi_class = atoi(strval);
288 		else
289 			ific->ifi_class = IPADM_IF_CLASS_REGULAR;
290 
291 		if (ific->ifi_class == IPADM_IF_CLASS_IPMP)
292 			/* do not expect any failures there */
293 			(void) i_ipadm_fill_pmembers(if_info_nvl,
294 			    &ific->ifi_ipmp_pmembers);
295 
296 		if (*if_info == NULL)
297 			*if_info = ific;
298 		else
299 			ifil->ifi_next = ific;
300 		ifil = ific;
301 	}
302 
303 	nvlist_free(ifs_info_nvl);
304 	return (status);
305 }
306 
307 /*
308  * Fill the ipadm_if_info_t->ifi_ipmp_pmembers by info from
309  * ipadm DB
310  */
311 static ipadm_status_t
i_ipadm_fill_pmembers(nvlist_t * if_info_nvl,ipadm_ipmp_members_t * pmembers)312 i_ipadm_fill_pmembers(nvlist_t *if_info_nvl, ipadm_ipmp_members_t *pmembers)
313 {
314 	uint_t	nelem = 0;
315 	char	**members;
316 	ipadm_ipmp_member_t *ipmp_member;
317 
318 	if (nvlist_lookup_string_array(if_info_nvl, IPADM_NVP_MIFNAMES,
319 	    &members, &nelem) != 0)
320 		return (IPADM_SUCCESS);
321 
322 	while (nelem-- > 0) {
323 		if ((ipmp_member = calloc(1,
324 		    sizeof (ipadm_ipmp_member_t))) == NULL)
325 			return (ipadm_errno2status(errno));
326 
327 		(void) strlcpy(ipmp_member->if_name, members[nelem],
328 		    sizeof (ipmp_member->if_name));
329 		list_insert_tail(pmembers, ipmp_member);
330 	}
331 	return (IPADM_SUCCESS);
332 }
333 
334 /*
335  * Fill the ipadm_if_info_t->ifi_ipmp_cmembers by info from
336  * kernel (libipmp is used to retrieve the required info)
337  */
338 static ipadm_status_t
i_ipadm_fill_cmembers(char * grname,ipadm_ipmp_members_t * cmembers)339 i_ipadm_fill_cmembers(char *grname, ipadm_ipmp_members_t *cmembers)
340 {
341 	ipmp_handle_t ipmp_handle;
342 	ipmp_groupinfo_t *grinfo;
343 	ipmp_iflist_t *iflistp;
344 	ipadm_ipmp_member_t *ipmp_member;
345 	ipadm_status_t ipadm_status = IPADM_SUCCESS;
346 	int i;
347 
348 	if (ipmp_open(&ipmp_handle) != IPMP_SUCCESS)
349 		return (IPADM_FAILURE);
350 
351 	if (ipmp_getgroupinfo(ipmp_handle, grname, &grinfo) != IPMP_SUCCESS) {
352 		ipadm_status = IPADM_FAILURE;
353 		goto fail2;
354 	}
355 
356 	iflistp = grinfo->gr_iflistp;
357 	for (i = 0; i < iflistp->il_nif; i++) {
358 		if ((ipmp_member = calloc(1,
359 		    sizeof (ipadm_ipmp_member_t))) == NULL) {
360 			ipadm_status = ipadm_errno2status(errno);
361 			goto fail1;
362 		}
363 		(void) strlcpy(ipmp_member->if_name, iflistp->il_ifs[i],
364 		    sizeof (ipmp_member->if_name));
365 		list_insert_tail(cmembers, ipmp_member);
366 	}
367 
368 fail1:
369 	ipmp_freegroupinfo(grinfo);
370 fail2:
371 	ipmp_close(ipmp_handle);
372 	return (ipadm_status);
373 }
374 
375 /*
376  * Collects information for `ifname' if one is specified from both
377  * active and persistent config in `if_info'. If no `ifname' is specified,
378  * this returns all the interfaces in active and persistent config in
379  * `if_info'.
380  */
381 ipadm_status_t
i_ipadm_get_all_if_info(ipadm_handle_t iph,const char * ifname,ipadm_if_info_t ** if_info,int64_t lifc_flags)382 i_ipadm_get_all_if_info(ipadm_handle_t iph, const char *ifname,
383     ipadm_if_info_t **if_info, int64_t lifc_flags)
384 {
385 	ipadm_status_t	status;
386 	ipadm_if_info_t	*aifinfo = NULL;
387 	ipadm_if_info_t	*pifinfo = NULL;
388 	ipadm_if_info_t	*aifp;
389 	ipadm_if_info_t	*pifp;
390 	ipadm_if_info_t	*last = NULL;
391 	struct ifaddrs	*ifa;
392 	struct ifaddrs	*ifap;
393 
394 	/*
395 	 * Retrive the information for the requested `ifname' or all
396 	 * interfaces from active configuration.
397 	 */
398 retry:
399 	status = i_ipadm_active_if_info(iph, ifname, &aifinfo, lifc_flags);
400 	if (status != IPADM_SUCCESS)
401 		return (status);
402 	/* Get the interface state for each interface in `aifinfo'. */
403 	if (aifinfo != NULL) {
404 		/* We need all addresses to get the interface state */
405 		if (getallifaddrs(AF_UNSPEC, &ifa, (LIFC_NOXMIT|LIFC_TEMPORARY|
406 		    LIFC_ALLZONES|LIFC_UNDER_IPMP)) != 0) {
407 			status = ipadm_errno2status(errno);
408 			goto fail;
409 		}
410 		for (aifp = aifinfo; aifp != NULL; aifp = aifp->ifi_next) {
411 			/*
412 			 * Find the `ifaddrs' structure from `ifa'
413 			 * for this interface. We need the IFF_* flags
414 			 * to find the interface state.
415 			 */
416 			for (ifap = ifa; ifap != NULL; ifap = ifap->ifa_next) {
417 				if (ifap->ifa_addr->sa_family == AF_LINK)
418 					continue;
419 				if (strcmp(ifap->ifa_name, aifp->ifi_name) == 0)
420 					break;
421 			}
422 			if (ifap == NULL) {
423 				/*
424 				 * The interface might have been removed
425 				 * from kernel. Retry getting all the active
426 				 * interfaces.
427 				 */
428 				freeifaddrs(ifa);
429 				ipadm_free_if_info(aifinfo);
430 				aifinfo = NULL;
431 				goto retry;
432 			}
433 			if (!(ifap->ifa_flags & IFF_RUNNING) ||
434 			    (ifap->ifa_flags & IFF_FAILED))
435 				aifp->ifi_state = IFIS_FAILED;
436 			else if (ifap->ifa_flags & IFF_OFFLINE)
437 				aifp->ifi_state = IFIS_OFFLINE;
438 			else if (i_ipadm_is_if_down(aifp->ifi_name, ifa))
439 				aifp->ifi_state = IFIS_DOWN;
440 			else
441 				aifp->ifi_state = IFIS_OK;
442 			if (aifp->ifi_next == NULL)
443 				last = aifp;
444 		}
445 		freeifaddrs(ifa);
446 	}
447 	/*
448 	 * Get the persistent interface information in `pifinfo'.
449 	 */
450 	status = i_ipadm_persist_if_info(iph, ifname, &pifinfo);
451 	if (status == IPADM_NOTFOUND) {
452 		*if_info = aifinfo;
453 		return (IPADM_SUCCESS);
454 	}
455 	if (status != IPADM_SUCCESS)
456 		goto fail;
457 
458 	/*
459 	 * Process the persistent interface information.
460 	 *
461 	 * First try to get the persistent "standby" property, as that isn't
462 	 * retrieved by i_ipadm_persist_if_info().
463 	 *
464 	 * Next, if a persistent interface is also found in `aifinfo', update
465 	 * its entry in `aifinfo' with the persistent information from
466 	 * `pifinfo'. If an interface is found in `pifinfo', but not in
467 	 * `aifinfo', it means that this interface was disabled. We should
468 	 * add this interface to `aifinfo' and set it state to IFIF_DISABLED.
469 	 */
470 	for (pifp = pifinfo; pifp != NULL; pifp = pifp->ifi_next) {
471 		char buf[10] = "";
472 		uint_t bufsize = sizeof (buf);
473 
474 		status = ipadm_get_ifprop(iph, pifp->ifi_name, "standby", buf,
475 		    &bufsize, MOD_PROTO_IP, IPADM_OPT_PERSIST);
476 
477 		if (status == IPADM_SUCCESS && strcmp(buf, "on") == 0)
478 			pifp->ifi_pflags |= IFIF_STANDBY;
479 
480 		for (aifp = aifinfo; aifp != NULL; aifp = aifp->ifi_next) {
481 			if (strcmp(aifp->ifi_name, pifp->ifi_name) == 0) {
482 				break;
483 			}
484 		}
485 
486 		if (aifp == NULL) {
487 			if ((status =
488 			    i_ipadm_allocate_ifinfo(&aifp)) != IPADM_SUCCESS)
489 				goto fail;
490 
491 			(void) strlcpy(aifp->ifi_name, pifp->ifi_name,
492 			    sizeof (aifp->ifi_name));
493 
494 			aifp->ifi_next = NULL;
495 			aifp->ifi_state = IFIS_DISABLED;
496 			if (last != NULL)
497 				last->ifi_next = aifp;
498 			else
499 				aifinfo = aifp;
500 			last = aifp;
501 		}
502 
503 		if ((status = i_ipadm_add_persistent_if_info(aifp,
504 		    pifp)) != IPADM_SUCCESS)
505 			goto fail;
506 	}
507 	*if_info = aifinfo;
508 	ipadm_free_if_info(pifinfo);
509 	return (IPADM_SUCCESS);
510 fail:
511 	*if_info = NULL;
512 	ipadm_free_if_info(aifinfo);
513 	ipadm_free_if_info(pifinfo);
514 	return (status);
515 }
516 
517 /*
518  * Updates active if_info by data from persistent if_info
519  */
520 static ipadm_status_t
i_ipadm_add_persistent_if_info(ipadm_if_info_t * aifp,ipadm_if_info_t * pifp)521 i_ipadm_add_persistent_if_info(ipadm_if_info_t *aifp, ipadm_if_info_t *pifp)
522 {
523 	ipadm_ipmp_member_t *pp_ipmp_member, *ap_ipmp_member;
524 
525 	ipadm_ipmp_members_t *apmembers = &aifp->ifi_ipmp_pmembers;
526 	ipadm_ipmp_members_t *ppmembers = &pifp->ifi_ipmp_pmembers;
527 
528 	aifp->ifi_pflags = pifp->ifi_pflags;
529 	aifp->ifi_class = pifp->ifi_class;
530 
531 	for (pp_ipmp_member = list_head(ppmembers); pp_ipmp_member;
532 	    pp_ipmp_member = list_next(ppmembers, pp_ipmp_member)) {
533 		if ((ap_ipmp_member = calloc(1,
534 		    sizeof (ipadm_ipmp_member_t))) == NULL)
535 			return (ipadm_errno2status(errno));
536 
537 		(void) strlcpy(ap_ipmp_member->if_name,
538 		    pp_ipmp_member->if_name,
539 		    sizeof (ap_ipmp_member->if_name));
540 
541 		list_insert_tail(apmembers, ap_ipmp_member);
542 	}
543 	return (IPADM_SUCCESS);
544 }
545 
546 static ipadm_status_t
i_ipadm_allocate_ifinfo(ipadm_if_info_t ** if_info)547 i_ipadm_allocate_ifinfo(ipadm_if_info_t **if_info)
548 {
549 	*if_info = calloc(1, sizeof (ipadm_if_info_t));
550 	if (*if_info == NULL)
551 		return (ipadm_errno2status(errno));
552 
553 	/* List of active (current) members */
554 	list_create(&((*if_info)->ifi_ipmp_cmembers),
555 	    sizeof (ipadm_ipmp_member_t),
556 	    offsetof(ipadm_ipmp_member_t, node));
557 
558 	/* List of persistent members */
559 	list_create(&((*if_info)->ifi_ipmp_pmembers),
560 	    sizeof (ipadm_ipmp_member_t),
561 	    offsetof(ipadm_ipmp_member_t, node));
562 
563 	return (IPADM_SUCCESS);
564 }
565 
566 /*
567  * Reads all the interface lines from the persistent DB into the nvlist `onvl',
568  * when `ifname' is NULL.
569  * If an `ifname' is specified, then the interface line corresponding to
570  * that name will be returned.
571  */
572 static ipadm_status_t
i_ipadm_get_db_if(ipadm_handle_t iph,const char * ifname,nvlist_t ** onvl)573 i_ipadm_get_db_if(ipadm_handle_t iph, const char *ifname, nvlist_t **onvl)
574 {
575 	ipmgmt_getif_arg_t	garg;
576 
577 	/* Populate the door_call argument structure */
578 	bzero(&garg, sizeof (garg));
579 	garg.ia_cmd = IPMGMT_CMD_GETIF;
580 	if (ifname != NULL)
581 		(void) strlcpy(garg.ia_ifname, ifname, sizeof (garg.ia_ifname));
582 
583 	return (i_ipadm_call_ipmgmtd(iph, (void *) &garg, sizeof (garg), onvl));
584 }
585 
586 int
i_ipadm_get_lnum(const char * ifname)587 i_ipadm_get_lnum(const char *ifname)
588 {
589 	char *num = strrchr(ifname, IPADM_LOGICAL_SEP);
590 
591 	if (num == NULL)
592 		return (0);
593 
594 	return (atoi(++num));
595 }
596 
597 /*
598  * Sets the output argument `exists' to true or false based on whether
599  * any persistent configuration is available for `ifname' and returns
600  * IPADM_SUCCESS as status. If the persistent information cannot be retrieved,
601  * `exists' is unmodified and an error status is returned.
602  */
603 ipadm_status_t
i_ipadm_if_pexists(ipadm_handle_t iph,const char * ifname,sa_family_t af,boolean_t * exists)604 i_ipadm_if_pexists(ipadm_handle_t iph, const char *ifname, sa_family_t af,
605     boolean_t *exists)
606 {
607 	ipadm_if_info_t	*ifinfo;
608 	ipadm_status_t	status;
609 
610 	/*
611 	 * if IPH_IPMGMTD is set, we know that the caller (ipmgmtd) already
612 	 * knows about persistent configuration in the first place, so we
613 	 * just return success.
614 	 */
615 	if (iph->iph_flags & IPH_IPMGMTD) {
616 		*exists = B_FALSE;
617 		return (IPADM_SUCCESS);
618 	}
619 	status = i_ipadm_persist_if_info(iph, ifname, &ifinfo);
620 	if (status == IPADM_SUCCESS) {
621 		*exists = ((af == AF_INET &&
622 		    (ifinfo->ifi_pflags & IFIF_IPV4)) ||
623 		    (af == AF_INET6 &&
624 		    (ifinfo->ifi_pflags & IFIF_IPV6)));
625 		ipadm_free_if_info(ifinfo);
626 	} else if (status == IPADM_NOTFOUND) {
627 		status = IPADM_SUCCESS;
628 		*exists = B_FALSE;
629 	}
630 	return (status);
631 }
632 
633 /*
634  * Open "/dev/udp{,6}" for use as a multiplexor to PLINK the interface stream
635  * under. We use "/dev/udp" instead of "/dev/ip" since STREAMS will not let
636  * you PLINK a driver under itself, and "/dev/ip" is typically the driver at
637  * the bottom of the stream for tunneling interfaces.
638  */
639 ipadm_status_t
ipadm_open_arp_on_udp(const char * udp_dev_name,int * fd)640 ipadm_open_arp_on_udp(const char *udp_dev_name, int *fd)
641 {
642 	int err;
643 
644 	if ((*fd = open(udp_dev_name, O_RDWR)) == -1)
645 		return (ipadm_errno2status(errno));
646 
647 	/*
648 	 * Pop off all undesired modules (note that the user may have
649 	 * configured autopush to add modules above udp), and push the
650 	 * arp module onto the resulting stream. This is used to make
651 	 * IP+ARP be able to atomically track the muxid for the I_PLINKed
652 	 * STREAMS, thus it isn't related to ARP running the ARP protocol.
653 	 */
654 	while (ioctl(*fd, I_POP, 0) != -1)
655 		;
656 	if (errno == EINVAL && ioctl(*fd, I_PUSH, ARP_MOD_NAME) != -1)
657 		return (IPADM_SUCCESS);
658 	err = errno;
659 	(void) close(*fd);
660 
661 	return (ipadm_errno2status(err));
662 }
663 
664 /*
665  * i_ipadm_create_ipmp() is called from i_ipadm_create_ipmp_peer() when an
666  * underlying interface in an ipmp group G is plumbed for an address family,
667  * but the meta-interface for the other address family `af' does not exist
668  * yet for the group G. If `af' is IPv6, we need to bring up the
669  * link-local address.
670  */
671 static ipadm_status_t
i_ipadm_create_ipmp(ipadm_handle_t iph,char * ifname,sa_family_t af,const char * grname,uint32_t ipadm_flags)672 i_ipadm_create_ipmp(ipadm_handle_t iph, char *ifname, sa_family_t af,
673     const char *grname, uint32_t ipadm_flags)
674 {
675 	ipadm_status_t	status;
676 	struct lifreq	lifr;
677 	int		sock;
678 	int		err;
679 
680 	assert(ipadm_flags & IPADM_OPT_IPMP);
681 
682 	/* Create the ipmp underlying interface */
683 	status = i_ipadm_create_if(iph, ifname, af, ipadm_flags);
684 	if (status != IPADM_SUCCESS && status != IPADM_IF_EXISTS)
685 		return (status);
686 
687 	/*
688 	 * To preserve backward-compatibility, always bring up the link-local
689 	 * address for implicitly-created IPv6 IPMP interfaces.
690 	 */
691 	if (af == AF_INET6)
692 		(void) i_ipadm_set_flags(iph, ifname, AF_INET6, IFF_UP, 0);
693 
694 	sock = (af == AF_INET ? iph->iph_sock : iph->iph_sock6);
695 	/*
696 	 * If the caller requested a different group name, issue a
697 	 * SIOCSLIFGROUPNAME on the new IPMP interface.
698 	 */
699 	bzero(&lifr, sizeof (lifr));
700 	(void) strlcpy(lifr.lifr_name, ifname, sizeof (lifr.lifr_name));
701 	if (strcmp(lifr.lifr_name, grname) != 0) {
702 		(void) strlcpy(lifr.lifr_groupname, grname, LIFGRNAMSIZ);
703 		if (ioctl(sock, SIOCSLIFGROUPNAME, &lifr) == -1) {
704 			err = errno;
705 			/* Remove the interface we created. */
706 			if (status == IPADM_SUCCESS) {
707 				(void) i_ipadm_delete_if(iph, ifname, af,
708 				    ipadm_flags);
709 			}
710 			return (ipadm_errno2status(err));
711 		}
712 	}
713 
714 	return (IPADM_SUCCESS);
715 }
716 
717 /*
718  * Checks if `ifname' is plumbed and in an IPMP group on its "other" address
719  * family.  If so, create a matching IPMP group for address family `af'.
720  */
721 static ipadm_status_t
i_ipadm_create_ipmp_peer(ipadm_handle_t iph,char * ifname,sa_family_t af)722 i_ipadm_create_ipmp_peer(ipadm_handle_t iph, char *ifname, sa_family_t af)
723 {
724 	lifgroupinfo_t	lifgr;
725 	ipadm_status_t	status = IPADM_SUCCESS;
726 	struct lifreq	lifr;
727 	int		other_af_sock;
728 
729 	assert(af == AF_INET || af == AF_INET6);
730 
731 	other_af_sock = (af == AF_INET ? iph->iph_sock6 : iph->iph_sock);
732 
733 	/*
734 	 * iph is the handle for the interface that we are trying to plumb.
735 	 * other_af_sock is the socket for the "other" address family.
736 	 */
737 	bzero(&lifr, sizeof (lifr));
738 	(void) strlcpy(lifr.lifr_name, ifname, sizeof (lifr.lifr_name));
739 	if (ioctl(other_af_sock, SIOCGLIFGROUPNAME, &lifr) != 0)
740 		return (IPADM_SUCCESS);
741 
742 	(void) strlcpy(lifgr.gi_grname, lifr.lifr_groupname, LIFGRNAMSIZ);
743 	if (ioctl(other_af_sock, SIOCGLIFGROUPINFO, &lifgr) != 0)
744 		return (IPADM_SUCCESS);
745 
746 	/*
747 	 * If `ifname' *is* the IPMP group interface, or if the relevant
748 	 * address family is already configured, then there's nothing to do.
749 	 */
750 	if (strcmp(lifgr.gi_grifname, ifname) == 0 ||
751 	    (af == AF_INET && lifgr.gi_v4) || (af == AF_INET6 && lifgr.gi_v6)) {
752 		return (IPADM_SUCCESS);
753 	}
754 
755 	status = i_ipadm_create_ipmp(iph, lifgr.gi_grifname, af,
756 	    lifgr.gi_grname, IPADM_OPT_ACTIVE|IPADM_OPT_IPMP);
757 	return (status);
758 }
759 
760 /*
761  * Issues the ioctl SIOCSLIFNAME to kernel on the given ARP stream fd.
762  */
763 static ipadm_status_t
i_ipadm_slifname_arp(char * ifname,uint64_t flags,int fd)764 i_ipadm_slifname_arp(char *ifname, uint64_t flags, int fd)
765 {
766 	struct lifreq	lifr;
767 	ifspec_t	ifsp;
768 
769 	bzero(&lifr, sizeof (lifr));
770 	(void) ifparse_ifspec(ifname, &ifsp);
771 	lifr.lifr_ppa = ifsp.ifsp_ppa;
772 	lifr.lifr_flags = flags;
773 	(void) strlcpy(lifr.lifr_name, ifname, sizeof (lifr.lifr_name));
774 	/*
775 	 * Tell ARP the name and unit number for this interface.
776 	 * Note that arp has no support for transparent ioctls.
777 	 */
778 	if (i_ipadm_strioctl(fd, SIOCSLIFNAME, (char *)&lifr,
779 	    sizeof (lifr)) == -1) {
780 		return (ipadm_errno2status(errno));
781 	}
782 	return (IPADM_SUCCESS);
783 }
784 
785 /*
786  * Issues the ioctl SIOCSLIFNAME to kernel. If IPADM_OPT_GENPPA is set in
787  * `ipadm_flags', then a ppa will be generated. `newif' will be updated
788  * with the generated ppa.
789  */
790 static ipadm_status_t
i_ipadm_slifname(ipadm_handle_t iph,char * ifname,char * newif,uint64_t flags,int fd,uint32_t ipadm_flags)791 i_ipadm_slifname(ipadm_handle_t iph, char *ifname, char *newif, uint64_t flags,
792     int fd, uint32_t ipadm_flags)
793 {
794 	struct lifreq	lifr;
795 	ipadm_status_t	status = IPADM_SUCCESS;
796 	int		err = 0;
797 	sa_family_t	af;
798 	int		ppa;
799 	ifspec_t	ifsp;
800 	boolean_t	valid_if;
801 
802 	bzero(&lifr, sizeof (lifr));
803 	if (ipadm_flags & IPADM_OPT_GENPPA) {
804 		/*
805 		 * We'd like to just set lifr_ppa to UINT_MAX and have the
806 		 * kernel pick a PPA.  Unfortunately, that would mishandle
807 		 * two cases:
808 		 *
809 		 *	1. If the PPA is available but the groupname is taken
810 		 *	   (e.g., the "ipmp2" IP interface name is available
811 		 *	   but the "ipmp2" groupname is taken) then the
812 		 *	   auto-assignment by the kernel will fail.
813 		 *
814 		 *	2. If we're creating (e.g.) an IPv6-only IPMP
815 		 *	   interface, and there's already an IPv4-only IPMP
816 		 *	   interface, the kernel will allow us to accidentally
817 		 *	   reuse the IPv6 IPMP interface name (since
818 		 *	   SIOCSLIFNAME uniqueness is per-interface-type).
819 		 *	   This will cause administrative confusion.
820 		 *
821 		 * Thus, we instead take a brute-force approach of checking
822 		 * whether the IPv4 or IPv6 name is already in-use before
823 		 * attempting the SIOCSLIFNAME.  As per (1) above, the
824 		 * SIOCSLIFNAME may still fail, in which case we just proceed
825 		 * to the next one.  If this approach becomes too slow, we
826 		 * can add a new SIOC* to handle this case in the kernel.
827 		 */
828 		for (ppa = 0; ppa < UINT_MAX; ppa++) {
829 			(void) snprintf(lifr.lifr_name, LIFNAMSIZ, "%s%d",
830 			    ifname, ppa);
831 
832 			if (ioctl(iph->iph_sock, SIOCGLIFFLAGS, &lifr) != -1 ||
833 			    errno != ENXIO)
834 				continue;
835 
836 			if (ioctl(iph->iph_sock6, SIOCGLIFFLAGS, &lifr) != -1 ||
837 			    errno != ENXIO)
838 				continue;
839 
840 			lifr.lifr_ppa = ppa;
841 			lifr.lifr_flags = flags;
842 
843 			err = ioctl(fd, SIOCSLIFNAME, &lifr);
844 			if (err != -1 || errno != EEXIST)
845 				break;
846 		}
847 		if (err == -1) {
848 			status = ipadm_errno2status(errno);
849 		} else {
850 			/*
851 			 * PPA has been successfully established.
852 			 * Update `newif' with the ppa.
853 			 */
854 			assert(newif != NULL);
855 			if (snprintf(newif, LIFNAMSIZ, "%s%d", ifname,
856 			    ppa) >= LIFNAMSIZ)
857 				return (IPADM_INVALID_ARG);
858 		}
859 	} else {
860 		/* We should have already validated the interface name. */
861 		valid_if = ifparse_ifspec(ifname, &ifsp);
862 		assert(valid_if);
863 
864 		/*
865 		 * Before we call SIOCSLIFNAME, ensure that the IPMP group
866 		 * interface for this address family exists.  Otherwise, the
867 		 * kernel will kick the interface out of the group when we do
868 		 * the SIOCSLIFNAME.
869 		 *
870 		 * Example: suppose bge0 is plumbed for IPv4 and in group "a".
871 		 * If we're now plumbing bge0 for IPv6, but the IPMP group
872 		 * interface for "a" is not plumbed for IPv6, the SIOCSLIFNAME
873 		 * will kick bge0 out of group "a", which is undesired.
874 		 */
875 		if (flags & IFF_IPV4)
876 			af = AF_INET;
877 		else
878 			af = AF_INET6;
879 		status = i_ipadm_create_ipmp_peer(iph, ifname, af);
880 		if (status != IPADM_SUCCESS)
881 			return (status);
882 		lifr.lifr_ppa = ifsp.ifsp_ppa;
883 		lifr.lifr_flags = flags;
884 		(void) strlcpy(lifr.lifr_name, ifname, sizeof (lifr.lifr_name));
885 		if (ioctl(fd, SIOCSLIFNAME, &lifr) == -1)
886 			status = ipadm_errno2status(errno);
887 	}
888 
889 	return (status);
890 }
891 
892 /*
893  * Plumbs the interface `ifname' for the address family `af'. It also persists
894  * the interface for `af' if IPADM_OPT_PERSIST is set in `ipadm_flags'.
895  */
896 ipadm_status_t
i_ipadm_plumb_if(ipadm_handle_t iph,char * ifname,sa_family_t af,uint32_t ipadm_flags)897 i_ipadm_plumb_if(ipadm_handle_t iph, char *ifname, sa_family_t af,
898     uint32_t ipadm_flags)
899 {
900 	int		ip_muxid;
901 	int		mux_fd = -1, ip_fd, arp_fd;
902 	char		*udp_dev_name;
903 	dlpi_handle_t	dh_arp = NULL, dh_ip;
904 	uint64_t	ifflags;
905 	struct lifreq	lifr;
906 	uint_t		dlpi_flags;
907 	ipadm_status_t	status = IPADM_SUCCESS;
908 	char		*linkname;
909 	boolean_t	legacy = (iph->iph_flags & IPH_LEGACY);
910 	zoneid_t	zoneid;
911 	char		newif[LIFNAMSIZ];
912 	char		lifname[LIFNAMSIZ];
913 	datalink_id_t	linkid;
914 	int		sock;
915 	boolean_t	islo;
916 	boolean_t	is_persistent =
917 	    ((ipadm_flags & IPADM_OPT_PERSIST) != 0);
918 	uint32_t	dlflags;
919 	dladm_status_t	dlstatus;
920 
921 	if (iph->iph_dlh != NULL) {
922 		dlstatus = dladm_name2info(iph->iph_dlh, ifname, &linkid,
923 		    &dlflags, NULL, NULL);
924 	}
925 	/*
926 	 * If we're in the global zone and we're plumbing a datalink, make
927 	 * sure that the datalink is not assigned to a non-global zone.  Note
928 	 * that the non-global zones don't need this check, because zoneadm
929 	 * has taken care of this when the zones boot.
930 	 */
931 	if (iph->iph_zoneid == GLOBAL_ZONEID && dlstatus == DLADM_STATUS_OK) {
932 		zoneid = ALL_ZONES;
933 		if (zone_check_datalink(&zoneid, linkid) == 0) {
934 			/* interface is in use by a non-global zone. */
935 			return (IPADM_IF_INUSE);
936 		}
937 	}
938 
939 	/* loopback interfaces are just added as logical interface */
940 	bzero(&lifr, sizeof (lifr));
941 	islo = i_ipadm_is_loopback(ifname);
942 	if (islo || i_ipadm_get_lnum(ifname) != 0) {
943 		(void) strlcpy(lifr.lifr_name, ifname, sizeof (lifr.lifr_name));
944 		if (af == AF_INET)
945 			sock = iph->iph_sock;
946 		else
947 			sock = iph->iph_sock6;
948 		if (islo && ioctl(sock, SIOCGLIFADDR, (caddr_t)&lifr) >= 0)
949 			return (IPADM_IF_EXISTS);
950 		if (ioctl(sock, SIOCLIFADDIF, (caddr_t)&lifr) < 0)
951 			return (ipadm_errno2status(errno));
952 
953 		/*
954 		 * By default, kernel configures 127.0.0.1 on the loopback
955 		 * interface. Replace this with 0.0.0.0 to be consistent
956 		 * with interface creation on other physical interfaces.
957 		 */
958 		if (islo && !legacy) {
959 			bzero(&lifr.lifr_addr, sizeof (lifr.lifr_addr));
960 			lifr.lifr_addr.ss_family = af;
961 			if (ioctl(sock, SIOCSLIFADDR, (caddr_t)&lifr) < 0)
962 				return (ipadm_errno2status(errno));
963 			if (is_persistent) {
964 				status = i_ipadm_persist_if(iph,
965 				    ifname, af, ipadm_flags);
966 				if (status != IPADM_SUCCESS) {
967 					(void) i_ipadm_delete_if(iph, ifname,
968 					    af, IPADM_OPT_ACTIVE);
969 				}
970 			}
971 		}
972 		return (status);
973 	}
974 
975 	dlpi_flags = DLPI_NOATTACH;
976 
977 	/*
978 	 * If IPADM_OPT_IPMP is specified, then this is a request
979 	 * to create an IPMP interface atop /dev/ipmpstub0.  (We can't simply
980 	 * pass "ipmpstub0" as devname since an admin *could* have a normal
981 	 * vanity-named link named "ipmpstub0" that they'd like to plumb.)
982 	 */
983 	if (ipadm_flags & IPADM_OPT_IPMP) {
984 		dlpi_flags |= DLPI_DEVONLY;
985 		linkname = "ipmpstub0";
986 	} else {
987 		/*
988 		 * Verify that the user is not creating a persistent
989 		 * IP interface on a non-persistent data-link.
990 		 */
991 		if (!i_ipadm_is_vni(ifname) && dlstatus == DLADM_STATUS_OK &&
992 		    is_persistent && !(dlflags & DLADM_OPT_PERSIST)) {
993 				return (IPADM_TEMPORARY_OBJ);
994 		}
995 		linkname = ifname;
996 	}
997 
998 	/*
999 	 * We use DLPI_NOATTACH because the ip module will do the attach
1000 	 * itself for DLPI style-2 devices.
1001 	 */
1002 	if (dlpi_open(linkname, &dh_ip, dlpi_flags) != DLPI_SUCCESS)
1003 		return (IPADM_DLPI_FAILURE);
1004 	ip_fd = dlpi_fd(dh_ip);
1005 	if (ioctl(ip_fd, I_PUSH, IP_MOD_NAME) == -1) {
1006 		status = ipadm_errno2status(errno);
1007 		goto done;
1008 	}
1009 
1010 	/*
1011 	 * Set IFF_IPV4/IFF_IPV6 flags. The kernel only allows modifications
1012 	 * to IFF_IPv4, IFF_IPV6, IFF_BROADCAST, IFF_XRESOLV, IFF_NOLINKLOCAL.
1013 	 */
1014 	ifflags = 0;
1015 
1016 	/* Set the name string and the IFF_IPV* flag */
1017 	if (af == AF_INET) {
1018 		ifflags = IFF_IPV4;
1019 	} else {
1020 		ifflags = IFF_IPV6;
1021 		/*
1022 		 * With the legacy method, the link-local address should be
1023 		 * configured as part of the interface plumb, using the default
1024 		 * token. If IPH_LEGACY is not specified, we want to set :: as
1025 		 * the address and require the admin to explicitly call
1026 		 * ipadm_create_addr() with the address object type set to
1027 		 * IPADM_ADDR_IPV6_ADDRCONF to create the link-local address
1028 		 * as well as the autoconfigured addresses.
1029 		 */
1030 		if (!legacy && !i_ipadm_is_6to4(iph, ifname))
1031 			ifflags |= IFF_NOLINKLOCAL;
1032 	}
1033 	(void) strlcpy(newif, ifname, sizeof (newif));
1034 	status = i_ipadm_slifname(iph, ifname, newif, ifflags, ip_fd,
1035 	    ipadm_flags);
1036 	if (status != IPADM_SUCCESS)
1037 		goto done;
1038 
1039 	/* Get the full set of existing flags for this stream */
1040 	status = i_ipadm_get_flags(iph, newif, af, &ifflags);
1041 	if (status != IPADM_SUCCESS)
1042 		goto done;
1043 
1044 	udp_dev_name = (af == AF_INET6 ? UDP6_DEV_NAME : UDP_DEV_NAME);
1045 	status = ipadm_open_arp_on_udp(udp_dev_name, &mux_fd);
1046 	if (status != IPADM_SUCCESS)
1047 		goto done;
1048 
1049 	/* Check if arp is not needed */
1050 	if (ifflags & (IFF_NOARP|IFF_IPV6)) {
1051 		/*
1052 		 * PLINK the interface stream so that the application can exit
1053 		 * without tearing down the stream.
1054 		 */
1055 		if ((ip_muxid = ioctl(mux_fd, I_PLINK, ip_fd)) == -1)
1056 			status = ipadm_errno2status(errno);
1057 		goto done;
1058 	}
1059 
1060 	/*
1061 	 * This interface does use ARP, so set up a separate stream
1062 	 * from the interface to ARP.
1063 	 *
1064 	 * We use DLPI_NOATTACH because the arp module will do the attach
1065 	 * itself for DLPI style-2 devices.
1066 	 */
1067 	if (dlpi_open(linkname, &dh_arp, dlpi_flags) != DLPI_SUCCESS) {
1068 		status = IPADM_DLPI_FAILURE;
1069 		goto done;
1070 	}
1071 
1072 	arp_fd = dlpi_fd(dh_arp);
1073 	if (ioctl(arp_fd, I_PUSH, ARP_MOD_NAME) == -1) {
1074 		status = ipadm_errno2status(errno);
1075 		goto done;
1076 	}
1077 
1078 	status = i_ipadm_slifname_arp(newif, ifflags, arp_fd);
1079 	if (status != IPADM_SUCCESS)
1080 		goto done;
1081 	/*
1082 	 * PLINK the IP and ARP streams so that ifconfig can exit
1083 	 * without tearing down the stream.
1084 	 */
1085 	if ((ip_muxid = ioctl(mux_fd, I_PLINK, ip_fd)) == -1) {
1086 		status = ipadm_errno2status(errno);
1087 		goto done;
1088 	}
1089 
1090 	if (ioctl(mux_fd, I_PLINK, arp_fd) < 0) {
1091 		status = ipadm_errno2status(errno);
1092 		(void) ioctl(mux_fd, I_PUNLINK, ip_muxid);
1093 	}
1094 
1095 done:
1096 	dlpi_close(dh_ip);
1097 	if (dh_arp != NULL)
1098 		dlpi_close(dh_arp);
1099 
1100 	if (mux_fd != -1)
1101 		(void) close(mux_fd);
1102 
1103 	if (status == IPADM_SUCCESS) {
1104 		/* copy back new ifname */
1105 		(void) strlcpy(ifname, newif, LIFNAMSIZ);
1106 		/*
1107 		 * If it is a 6to4 tunnel, create a default
1108 		 * addrobj name for the default address on the 0'th
1109 		 * logical interface and set IFF_UP in the interface flags.
1110 		 */
1111 		if (i_ipadm_is_6to4(iph, ifname)) {
1112 			struct ipadm_addrobj_s addr;
1113 
1114 			i_ipadm_init_addr(&addr, ifname, "", IPADM_ADDR_STATIC);
1115 			addr.ipadm_af = af;
1116 			status = i_ipadm_lookupadd_addrobj(iph, &addr);
1117 			if (status != IPADM_SUCCESS)
1118 				return (status);
1119 			status = ipadm_add_aobjname(iph, ifname,
1120 			    af, addr.ipadm_aobjname, IPADM_ADDR_STATIC, 0);
1121 			if (status != IPADM_SUCCESS)
1122 				return (status);
1123 			addr.ipadm_lifnum = 0;
1124 			i_ipadm_addrobj2lifname(&addr, lifname,
1125 			    sizeof (lifname));
1126 			status = i_ipadm_set_flags(iph, lifname, af,
1127 			    IFF_UP, 0);
1128 			if (status != IPADM_SUCCESS)
1129 				return (status);
1130 		} else {
1131 			/*
1132 			 * Prevent static IPv6 addresses from triggering
1133 			 * autoconf. This does not have to be done for
1134 			 * 6to4 tunnel interfaces, since in.ndpd will
1135 			 * not autoconfigure those interfaces.
1136 			 */
1137 			if (af == AF_INET6 && !legacy)
1138 				(void) i_ipadm_disable_autoconf(newif);
1139 		}
1140 
1141 		/*
1142 		 * If IPADM_OPT_PERSIST was set in flags, store the
1143 		 * interface in persistent DB.
1144 		 */
1145 		if (is_persistent) {
1146 			status = i_ipadm_persist_if(iph,
1147 			    newif, af, ipadm_flags);
1148 			if (status != IPADM_SUCCESS) {
1149 				(void) i_ipadm_delete_if(iph, newif, af,
1150 				    IPADM_OPT_ACTIVE);
1151 			}
1152 		}
1153 	}
1154 	if (status == IPADM_EXISTS)
1155 		status = IPADM_IF_EXISTS;
1156 	return (status);
1157 }
1158 
1159 /*
1160  * Unplumbs the interface in `ifname' of family `af'.
1161  */
1162 ipadm_status_t
i_ipadm_unplumb_if(ipadm_handle_t iph,const char * ifname,sa_family_t af)1163 i_ipadm_unplumb_if(ipadm_handle_t iph, const char *ifname, sa_family_t af)
1164 {
1165 	int		ip_muxid, arp_muxid;
1166 	int		mux_fd = -1;
1167 	int		muxid_fd = -1;
1168 	char		*udp_dev_name;
1169 	uint64_t	flags;
1170 	boolean_t	changed_arp_muxid = B_FALSE;
1171 	int		save_errno;
1172 	struct lifreq	lifr;
1173 	ipadm_status_t	ret = IPADM_SUCCESS;
1174 	int		sock;
1175 	lifgroupinfo_t	lifgr;
1176 	ifaddrlistx_t	*ifaddrs, *ifaddrp;
1177 	boolean_t	v6 = (af == AF_INET6);
1178 
1179 	/* Just do SIOCLIFREMOVEIF on loopback interfaces */
1180 	bzero(&lifr, sizeof (lifr));
1181 	if (i_ipadm_is_loopback(ifname) ||
1182 	    (i_ipadm_get_lnum(ifname) != 0 && (iph->iph_flags & IPH_LEGACY))) {
1183 		(void) strlcpy(lifr.lifr_name, ifname, sizeof (lifr.lifr_name));
1184 		if (ioctl((af == AF_INET) ? iph->iph_sock : iph->iph_sock6,
1185 		    SIOCLIFREMOVEIF, (caddr_t)&lifr) < 0) {
1186 			return (ipadm_errno2status(errno));
1187 		}
1188 		return (IPADM_SUCCESS);
1189 	}
1190 
1191 	/*
1192 	 * We used /dev/udp or udp6 to set up the mux. So we have to use
1193 	 * the same now for PUNLINK also.
1194 	 */
1195 	if (v6) {
1196 		udp_dev_name = UDP6_DEV_NAME;
1197 		sock = iph->iph_sock6;
1198 	} else {
1199 		udp_dev_name = UDP_DEV_NAME;
1200 		sock = iph->iph_sock;
1201 	}
1202 	if ((muxid_fd = open(udp_dev_name, O_RDWR)) == -1) {
1203 		ret = ipadm_errno2status(errno);
1204 		goto done;
1205 	}
1206 	ret = ipadm_open_arp_on_udp(udp_dev_name, &mux_fd);
1207 	if (ret != IPADM_SUCCESS)
1208 		goto done;
1209 	(void) strlcpy(lifr.lifr_name, ifname, sizeof (lifr.lifr_name));
1210 	if (ioctl(muxid_fd, SIOCGLIFFLAGS, (caddr_t)&lifr) < 0) {
1211 		ret = ipadm_errno2status(errno);
1212 		goto done;
1213 	}
1214 	flags = lifr.lifr_flags;
1215 again:
1216 	if (flags & IFF_IPMP) {
1217 		/*
1218 		 * There are two reasons the I_PUNLINK can fail with EBUSY:
1219 		 * (1) if IP interfaces are in the group, or (2) if IPMP data
1220 		 * addresses are administratively up.  For case (1), we fail
1221 		 * here with a specific error message.  For case (2), we bring
1222 		 * down the addresses prior to doing the I_PUNLINK.  If the
1223 		 * I_PUNLINK still fails with EBUSY then the configuration
1224 		 * must have changed after our checks, in which case we branch
1225 		 * back up to `again' and rerun this logic.  The net effect is
1226 		 * that unplumbing an IPMP interface will only fail with EBUSY
1227 		 * if IP interfaces are in the group.
1228 		 */
1229 		if (ioctl(sock, SIOCGLIFGROUPNAME, &lifr) == -1) {
1230 			ret = ipadm_errno2status(errno);
1231 			goto done;
1232 		}
1233 		(void) strlcpy(lifgr.gi_grname, lifr.lifr_groupname,
1234 		    LIFGRNAMSIZ);
1235 		if (ioctl(sock, SIOCGLIFGROUPINFO, &lifgr) == -1) {
1236 			ret = ipadm_errno2status(errno);
1237 			goto done;
1238 		}
1239 		if ((v6 && lifgr.gi_nv6 != 0) || (!v6 && lifgr.gi_nv4 != 0)) {
1240 			ret = IPADM_GRP_NOTEMPTY;
1241 			goto done;
1242 		}
1243 
1244 		/*
1245 		 * The kernel will fail the I_PUNLINK if the IPMP interface
1246 		 * has administratively up addresses; bring them down.
1247 		 */
1248 		if (ifaddrlistx(ifname, IFF_UP|IFF_DUPLICATE,
1249 		    0, &ifaddrs) == -1) {
1250 			ret = ipadm_errno2status(errno);
1251 			goto done;
1252 		}
1253 		ifaddrp = ifaddrs;
1254 		for (; ifaddrp != NULL; ifaddrp = ifaddrp->ia_next) {
1255 			int sock = (ifaddrp->ia_flags & IFF_IPV4) ?
1256 			    iph->iph_sock : iph->iph_sock6;
1257 			struct lifreq lifrl;
1258 
1259 			if (((ifaddrp->ia_flags & IFF_IPV6) && !v6) ||
1260 			    (!(ifaddrp->ia_flags & IFF_IPV6) && v6))
1261 				continue;
1262 
1263 			bzero(&lifrl, sizeof (lifrl));
1264 			(void) strlcpy(lifrl.lifr_name, ifaddrp->ia_name,
1265 			    sizeof (lifrl.lifr_name));
1266 			if (ioctl(sock, SIOCGLIFFLAGS, &lifrl) < 0) {
1267 				ret = ipadm_errno2status(errno);
1268 				ifaddrlistx_free(ifaddrs);
1269 				goto done;
1270 			}
1271 			if (lifrl.lifr_flags & IFF_UP) {
1272 				ret = i_ipadm_set_flags(iph, lifrl.lifr_name,
1273 				    ((lifrl.lifr_flags & IFF_IPV4) ? AF_INET :
1274 				    AF_INET6), 0, IFF_UP);
1275 				if (ret != IPADM_SUCCESS) {
1276 					ifaddrlistx_free(ifaddrs);
1277 					goto done;
1278 				}
1279 			} else if (lifrl.lifr_flags & IFF_DUPLICATE) {
1280 				if (ioctl(sock, SIOCGLIFADDR, &lifrl) < 0 ||
1281 				    ioctl(sock, SIOCSLIFADDR, &lifrl) < 0) {
1282 					ret = ipadm_errno2status(errno);
1283 					ifaddrlistx_free(ifaddrs);
1284 					goto done;
1285 				}
1286 			}
1287 		}
1288 		ifaddrlistx_free(ifaddrs);
1289 	}
1290 
1291 	if (ioctl(muxid_fd, SIOCGLIFMUXID, (caddr_t)&lifr) < 0) {
1292 		ret = ipadm_errno2status(errno);
1293 		goto done;
1294 	}
1295 	arp_muxid = lifr.lifr_arp_muxid;
1296 	ip_muxid = lifr.lifr_ip_muxid;
1297 
1298 	/*
1299 	 * We don't have a good way of knowing whether the arp stream is
1300 	 * plumbed. We can't rely on IFF_NOARP because someone could
1301 	 * have turned it off later using "ifconfig xxx -arp".
1302 	 */
1303 	if (arp_muxid != 0) {
1304 		if (ioctl(mux_fd, I_PUNLINK, arp_muxid) < 0) {
1305 			/*
1306 			 * See the comment before the SIOCGLIFGROUPNAME call.
1307 			 */
1308 			if (errno == EBUSY && (flags & IFF_IPMP))
1309 				goto again;
1310 
1311 			if ((errno == EINVAL) &&
1312 			    (flags & (IFF_NOARP | IFF_IPV6))) {
1313 				/*
1314 				 * Some plumbing utilities set the muxid to
1315 				 * -1 or some invalid value to signify that
1316 				 * there is no arp stream. Set the muxid to 0
1317 				 * before trying to unplumb the IP stream.
1318 				 * IP does not allow the IP stream to be
1319 				 * unplumbed if it sees a non-null arp muxid,
1320 				 * for consistency of IP-ARP streams.
1321 				 */
1322 				lifr.lifr_arp_muxid = 0;
1323 				(void) ioctl(muxid_fd, SIOCSLIFMUXID,
1324 				    (caddr_t)&lifr);
1325 				changed_arp_muxid = B_TRUE;
1326 			}
1327 			/*
1328 			 * In case of any other error, we continue with
1329 			 * the unplumb.
1330 			 */
1331 		}
1332 	}
1333 
1334 	if (ioctl(mux_fd, I_PUNLINK, ip_muxid) < 0) {
1335 		if (changed_arp_muxid) {
1336 			/*
1337 			 * Some error occurred, and we need to restore
1338 			 * everything back to what it was.
1339 			 */
1340 			save_errno = errno;
1341 			lifr.lifr_arp_muxid = arp_muxid;
1342 			lifr.lifr_ip_muxid = ip_muxid;
1343 			(void) ioctl(muxid_fd, SIOCSLIFMUXID, (caddr_t)&lifr);
1344 			errno = save_errno;
1345 		}
1346 		/*
1347 		 * See the comment before the SIOCGLIFGROUPNAME call.
1348 		 */
1349 		if (errno == EBUSY && (flags & IFF_IPMP))
1350 			goto again;
1351 
1352 		ret = ipadm_errno2status(errno);
1353 	}
1354 done:
1355 	if (muxid_fd != -1)
1356 		(void) close(muxid_fd);
1357 	if (mux_fd != -1)
1358 		(void) close(mux_fd);
1359 
1360 	if (af == AF_INET6 && ret == IPADM_SUCCESS) {
1361 		/*
1362 		 * in.ndpd maintains the phyints in its memory even after
1363 		 * the interface is plumbed, so that it can be reused when
1364 		 * the interface gets plumbed again. The default behavior
1365 		 * of in.ndpd is to start autoconfiguration for an interface
1366 		 * that gets plumbed. We need to send the
1367 		 * message IPADM_ENABLE_AUTOCONF to in.ndpd to restore this
1368 		 * default behavior on replumb.
1369 		 */
1370 		(void) i_ipadm_enable_autoconf(ifname);
1371 	}
1372 	return (ret);
1373 }
1374 
1375 /*
1376  * Saves the given interface name `ifname' with address family `af' in
1377  * persistent DB.
1378  */
1379 static ipadm_status_t
i_ipadm_persist_if(ipadm_handle_t iph,const char * ifname,sa_family_t af,uint32_t ipadm_flags)1380 i_ipadm_persist_if(ipadm_handle_t iph, const char *ifname, sa_family_t af,
1381     uint32_t ipadm_flags)
1382 {
1383 	ipmgmt_if_arg_t		ifarg;
1384 	int			err;
1385 
1386 	(void) strlcpy(ifarg.ia_ifname, ifname, sizeof (ifarg.ia_ifname));
1387 	ifarg.ia_family = af;
1388 	if (ipadm_flags & IPADM_OPT_IPMP)
1389 		ifarg.ia_ifclass = IPADM_IF_CLASS_IPMP;
1390 	else
1391 		ifarg.ia_ifclass = IPADM_IF_CLASS_REGULAR;
1392 
1393 	ifarg.ia_cmd = IPMGMT_CMD_SETIF;
1394 	ifarg.ia_flags = IPMGMT_PERSIST;
1395 	err = ipadm_door_call(iph, &ifarg, sizeof (ifarg), NULL, 0, B_FALSE);
1396 	return (ipadm_errno2status(err));
1397 }
1398 
1399 /*
1400  * Remove the IP interface from active configuration. If IPADM_OPT_PERSIST
1401  * is set in `ipadm_flags', it is also removed from persistent configuration.
1402  */
1403 ipadm_status_t
i_ipadm_delete_if(ipadm_handle_t iph,const char * ifname,sa_family_t af,uint32_t ipadm_flags)1404 i_ipadm_delete_if(ipadm_handle_t iph, const char *ifname, sa_family_t af,
1405     uint32_t ipadm_flags)
1406 {
1407 	ipadm_status_t		ret = IPADM_SUCCESS;
1408 	ipadm_status_t		db_status;
1409 	char			tmp_ifname[LIFNAMSIZ];
1410 	char			*cp;
1411 	struct ipadm_addrobj_s	ipaddr;
1412 	boolean_t		is_persistent =
1413 	    (ipadm_flags & IPADM_OPT_PERSIST);
1414 
1415 	ret = i_ipadm_unplumb_if(iph, ifname, af);
1416 	if (ret != IPADM_SUCCESS)
1417 		goto done;
1418 
1419 	cp = strrchr(ifname, IPADM_LOGICAL_SEP);
1420 	if (cp != NULL) {
1421 		assert(iph->iph_flags & IPH_LEGACY);
1422 		/*
1423 		 * This is a non-zero logical interface.
1424 		 * Find the addrobj and remove it from the daemon's memory.
1425 		 */
1426 		(void) strlcpy(tmp_ifname, ifname, sizeof (tmp_ifname));
1427 		tmp_ifname[cp - ifname] = '\0';
1428 		*cp++ = '\0';
1429 		ipaddr.ipadm_lifnum = atoi(cp);
1430 		(void) strlcpy(ipaddr.ipadm_ifname, tmp_ifname,
1431 		    sizeof (ipaddr.ipadm_ifname));
1432 		ipaddr.ipadm_af = af;
1433 		ret = i_ipadm_get_lif2addrobj(iph, &ipaddr);
1434 		if (ret == IPADM_SUCCESS) {
1435 			ret = i_ipadm_delete_addrobj(iph, &ipaddr,
1436 			    IPADM_OPT_ACTIVE);
1437 		} else if (ret == IPADM_NOTFOUND) {
1438 			ret = IPADM_SUCCESS;
1439 		}
1440 		return (ret);
1441 	}
1442 done:
1443 	/*
1444 	 * Even if interface does not exist, remove all its addresses and
1445 	 * properties from the persistent store. If interface does not
1446 	 * exist both in kernel and the persistent store, return IPADM_ENXIO.
1447 	 */
1448 	if ((ret == IPADM_ENXIO && is_persistent) || ret == IPADM_SUCCESS) {
1449 		db_status = i_ipadm_delete_ifobj(iph, ifname, af,
1450 		    is_persistent);
1451 		if (db_status == IPADM_SUCCESS)
1452 			ret = IPADM_SUCCESS;
1453 	}
1454 
1455 	return (ret);
1456 }
1457 
1458 /*
1459  * Resets all addresses on interface `ifname' with address family `af'
1460  * from ipmgmtd daemon. If is_persistent = B_TRUE, all interface properties
1461  * and address objects of `ifname' for `af' are also removed from the
1462  * persistent DB.
1463  */
1464 ipadm_status_t
i_ipadm_delete_ifobj(ipadm_handle_t iph,const char * ifname,sa_family_t af,boolean_t is_persistent)1465 i_ipadm_delete_ifobj(ipadm_handle_t iph, const char *ifname, sa_family_t af,
1466     boolean_t is_persistent)
1467 {
1468 	ipmgmt_if_arg_t		ifarg;
1469 	int			err;
1470 
1471 	ifarg.ia_cmd = IPMGMT_CMD_RESETIF;
1472 	ifarg.ia_flags = IPMGMT_ACTIVE;
1473 	if (is_persistent)
1474 		ifarg.ia_flags |= IPMGMT_PERSIST;
1475 	ifarg.ia_family = af;
1476 	(void) strlcpy(ifarg.ia_ifname, ifname, LIFNAMSIZ);
1477 
1478 	err = ipadm_door_call(iph, &ifarg, sizeof (ifarg), NULL, 0, B_FALSE);
1479 	return (ipadm_errno2status(err));
1480 }
1481 
1482 /*
1483  * Create the interface by plumbing it for IP.
1484  * This function will check if there is saved configuration information
1485  * for `ifname' and return IPADM_OP_DISABLE_OBJ if the name-space
1486  * for `ifname' is taken.
1487  */
1488 ipadm_status_t
i_ipadm_create_if(ipadm_handle_t iph,char * ifname,sa_family_t af,uint32_t ipadm_flags)1489 i_ipadm_create_if(ipadm_handle_t iph, char *ifname, sa_family_t af,
1490     uint32_t ipadm_flags)
1491 {
1492 	ipadm_status_t	status;
1493 	boolean_t	p_exists;
1494 	sa_family_t	other_af;
1495 
1496 	/*
1497 	 * Return error, if the interface already exists in either the active
1498 	 * or the persistent configuration.
1499 	 */
1500 	if (ipadm_if_enabled(iph, ifname, af))
1501 		return (IPADM_IF_EXISTS);
1502 
1503 	if (!(iph->iph_flags & IPH_LEGACY)) {
1504 		status = i_ipadm_if_pexists(iph, ifname, af, &p_exists);
1505 		if (status != IPADM_SUCCESS)
1506 			return (status);
1507 		other_af = (af == AF_INET ? AF_INET6 : AF_INET);
1508 		if (p_exists) {
1509 			if (!ipadm_if_enabled(iph, ifname, other_af))
1510 				return (IPADM_OP_DISABLE_OBJ);
1511 			else
1512 				ipadm_flags &= ~IPADM_OPT_PERSIST;
1513 		}
1514 	}
1515 
1516 	return (i_ipadm_plumb_if(iph, ifname, af, ipadm_flags));
1517 }
1518 
1519 /*
1520  * Plumbs an interface. Creates both IPv4 and IPv6 interfaces by
1521  * default, unless a value in `af' is specified. The interface may be plumbed
1522  * only if there is no previously saved persistent configuration information
1523  * for the interface (in which case the ipadm_enable_if() function must
1524  * be used to enable the interface).
1525  *
1526  * Returns: IPADM_SUCCESS, IPADM_FAILURE, IPADM_IF_EXISTS,
1527  * IPADM_IF_PERSIST_EXISTS, IPADM_DLPI_FAILURE,
1528  * or appropriate ipadm_status_t corresponding to the errno.
1529  *
1530  * `ifname' must point to memory that can hold upto LIFNAMSIZ chars. It may
1531  * be over-written with the actual interface name when a PPA has to be
1532  * internally generated by the library.
1533  */
1534 ipadm_status_t
ipadm_create_if(ipadm_handle_t iph,char * ifname,sa_family_t af,uint32_t flags)1535 ipadm_create_if(ipadm_handle_t iph, char *ifname, sa_family_t af,
1536     uint32_t flags)
1537 {
1538 	ipadm_status_t	status;
1539 	boolean_t	created_v4 = B_FALSE;
1540 	char		newifname[LIFNAMSIZ];
1541 
1542 	/* Check for the required authorization */
1543 	if (!ipadm_check_auth())
1544 		return (IPADM_EAUTH);
1545 
1546 	if (flags == 0 || ((flags & IPADM_OPT_PERSIST) &&
1547 	    !(flags & IPADM_OPT_ACTIVE)) ||
1548 	    (flags & ~(IPADM_COMMON_OPT_MASK | IPADM_OPT_IPMP |
1549 	    IPADM_OPT_GENPPA))) {
1550 		return (IPADM_INVALID_ARG);
1551 	}
1552 	if (flags & IPADM_OPT_GENPPA) {
1553 		if (snprintf(newifname, LIFNAMSIZ, "%s0", ifname) >=
1554 		    LIFNAMSIZ)
1555 			return (IPADM_INVALID_ARG);
1556 	} else {
1557 		if (strlcpy(newifname, ifname, LIFNAMSIZ) >= LIFNAMSIZ)
1558 			return (IPADM_INVALID_ARG);
1559 	}
1560 
1561 	if (!i_ipadm_validate_ifname(iph, newifname))
1562 		return (IPADM_INVALID_ARG);
1563 
1564 	if ((af == AF_INET || af == AF_UNSPEC) &&
1565 	    !i_ipadm_is_6to4(iph, ifname)) {
1566 		status = i_ipadm_create_if(iph, ifname, AF_INET, flags);
1567 		if (status != IPADM_SUCCESS)
1568 			return (status);
1569 		created_v4 = B_TRUE;
1570 	}
1571 	if (af == AF_INET6 || af == AF_UNSPEC) {
1572 		status = i_ipadm_create_if(iph, ifname, AF_INET6, flags);
1573 		if (status != IPADM_SUCCESS) {
1574 			if (created_v4) {
1575 				(void) i_ipadm_delete_if(iph, ifname, AF_INET,
1576 				    IPADM_OPT_ACTIVE);
1577 			}
1578 			return (status);
1579 		}
1580 	}
1581 
1582 	return (IPADM_SUCCESS);
1583 }
1584 
1585 ipadm_status_t
ipadm_add_ipmp_member(ipadm_handle_t iph,const char * gifname,const char * mifname,uint32_t ipadm_flags)1586 ipadm_add_ipmp_member(ipadm_handle_t iph, const char *gifname,
1587     const char *mifname, uint32_t ipadm_flags)
1588 {
1589 	return (i_ipadm_update_ipmp(iph, gifname, mifname,
1590 	    ipadm_flags, IPADM_ADD_IPMP));
1591 }
1592 
1593 ipadm_status_t
ipadm_remove_ipmp_member(ipadm_handle_t iph,const char * gifname,const char * mifname,uint32_t ipadm_flags)1594 ipadm_remove_ipmp_member(ipadm_handle_t iph, const char *gifname,
1595     const char *mifname, uint32_t ipadm_flags)
1596 {
1597 	return (i_ipadm_update_ipmp(iph, gifname, mifname,
1598 	    ipadm_flags, IPADM_REMOVE_IPMP));
1599 }
1600 
1601 /*
1602  * Updates active IPMP configuration according to the specified
1603  * command. It also persists the configuration if IPADM_OPT_PERSIST
1604  * is set in `ipadm_flags'.
1605  */
1606 static ipadm_status_t
i_ipadm_update_ipmp(ipadm_handle_t iph,const char * gifname,const char * mifname,uint32_t ipadm_flags,ipadm_ipmp_op_t op)1607 i_ipadm_update_ipmp(ipadm_handle_t iph, const char *gifname,
1608     const char *mifname, uint32_t ipadm_flags, ipadm_ipmp_op_t op)
1609 {
1610 	ipadm_status_t status;
1611 	char	groupname1[LIFGRNAMSIZ];
1612 	char	groupname2[LIFGRNAMSIZ];
1613 
1614 	/* Check for the required authorization */
1615 	if (!ipadm_check_auth())
1616 		return (IPADM_EAUTH);
1617 
1618 	if (!(ipadm_flags & IPADM_OPT_ACTIVE) ||
1619 	    gifname == NULL || mifname == NULL)
1620 		return (IPADM_INVALID_ARG);
1621 
1622 	if (!ipadm_if_enabled(iph, gifname, AF_UNSPEC) ||
1623 	    !ipadm_if_enabled(iph, mifname, AF_UNSPEC))
1624 		return (IPADM_OP_DISABLE_OBJ);
1625 
1626 	if (!i_ipadm_is_ipmp(iph, gifname))
1627 		return (IPADM_INVALID_ARG);
1628 
1629 	if (op == IPADM_ADD_IPMP && i_ipadm_is_under_ipmp(iph, mifname))
1630 		return (IPADM_IF_INUSE);
1631 
1632 	if ((status = i_ipadm_get_groupname_active(iph, gifname,
1633 	    groupname2, sizeof (groupname2))) != IPADM_SUCCESS)
1634 		return (status);
1635 
1636 	if (op == IPADM_REMOVE_IPMP) {
1637 		if ((status = i_ipadm_get_groupname_active(iph, mifname,
1638 		    groupname1, sizeof (groupname1))) != IPADM_SUCCESS)
1639 			return (status);
1640 
1641 		if (groupname1[0] == '\0' ||
1642 		    strcmp(groupname1, groupname2) != 0)
1643 			return (IPADM_INVALID_ARG);
1644 
1645 		groupname2[0] = '\0';
1646 	}
1647 
1648 	if ((ipadm_flags & IPADM_OPT_PERSIST) &&
1649 	    (status = i_ipadm_persist_update_ipmp(iph, gifname,
1650 	    mifname, op)) != IPADM_SUCCESS)
1651 		return (status);
1652 
1653 	return (i_ipadm_set_groupname_active(iph, mifname, groupname2));
1654 }
1655 
1656 /*
1657  * Call the ipmgmtd to update the IPMP configuration in ipadm DB.
1658  * After this call the DB will know that mifname is under gifname and
1659  * gifname has a member, which name is mifname.
1660  */
1661 static ipadm_status_t
i_ipadm_persist_update_ipmp(ipadm_handle_t iph,const char * gifname,const char * mifname,ipadm_ipmp_op_t op)1662 i_ipadm_persist_update_ipmp(ipadm_handle_t iph, const char *gifname,
1663     const char *mifname, ipadm_ipmp_op_t op)
1664 {
1665 	ipmgmt_ipmp_update_arg_t args;
1666 	int err;
1667 
1668 	assert(op == IPADM_ADD_IPMP || op == IPADM_REMOVE_IPMP);
1669 
1670 	bzero(&args, sizeof (ipmgmt_ipmp_update_arg_t));
1671 
1672 	args.ia_cmd = IPMGMT_CMD_IPMP_UPDATE;
1673 
1674 	(void) strlcpy(args.ia_gifname, gifname, sizeof (args.ia_gifname));
1675 	(void) strlcpy(args.ia_mifname, mifname, sizeof (args.ia_mifname));
1676 
1677 	if (op == IPADM_ADD_IPMP)
1678 		args.ia_flags = IPMGMT_APPEND;
1679 	else
1680 		args.ia_flags = IPMGMT_REMOVE;
1681 
1682 	args.ia_flags |= IPMGMT_PERSIST;
1683 
1684 	err = ipadm_door_call(iph, &args, sizeof (args), NULL, 0, B_FALSE);
1685 	return (ipadm_errno2status(err));
1686 }
1687 
1688 /*
1689  * Deletes the interface in `ifname'. Removes both IPv4 and IPv6 interfaces
1690  * when `af' = AF_UNSPEC.
1691  */
1692 ipadm_status_t
ipadm_delete_if(ipadm_handle_t iph,const char * ifname,sa_family_t af,uint32_t flags)1693 ipadm_delete_if(ipadm_handle_t iph, const char *ifname, sa_family_t af,
1694     uint32_t flags)
1695 {
1696 	ipadm_status_t status1 = IPADM_SUCCESS;
1697 	ipadm_status_t status2 = IPADM_SUCCESS;
1698 	ipadm_status_t other;
1699 
1700 	/* Check for the required authorization */
1701 	if (!ipadm_check_auth())
1702 		return (IPADM_EAUTH);
1703 
1704 	/* Validate the `ifname' for any logical interface. */
1705 	if (flags == 0 || (flags & ~(IPADM_COMMON_OPT_MASK)) ||
1706 	    !i_ipadm_validate_ifname(iph, ifname))
1707 		return (IPADM_INVALID_ARG);
1708 
1709 	if (af == AF_INET || af == AF_UNSPEC)
1710 		status1 = i_ipadm_delete_if(iph, ifname, AF_INET, flags);
1711 	if (af == AF_INET6 || af == AF_UNSPEC)
1712 		status2 = i_ipadm_delete_if(iph, ifname, AF_INET6, flags);
1713 	/*
1714 	 * If the family has been uniquely identified, we return the
1715 	 * associated status, even if that is ENXIO. Calls from ifconfig
1716 	 * which can only unplumb one of IPv4/IPv6 at any time fall under
1717 	 * this category.
1718 	 */
1719 	if (af == AF_INET)
1720 		return (status1);
1721 	else if (af == AF_INET6)
1722 		return (status2);
1723 	else if (af != AF_UNSPEC)
1724 		return (IPADM_INVALID_ARG);
1725 
1726 	/*
1727 	 * If af is AF_UNSPEC, then we return the following:
1728 	 * status1,		if status1 == status2
1729 	 * IPADM_SUCCESS,	if either of status1 or status2 is SUCCESS
1730 	 *			and the other status is ENXIO
1731 	 * IPADM_ENXIO,		if both status1 and status2 are ENXIO
1732 	 * IPADM_FAILURE	otherwise.
1733 	 */
1734 	if (status1 == status2) {
1735 		/* covers the case when both status1 and status2 are ENXIO */
1736 		return (status1);
1737 	} else if (status1 == IPADM_SUCCESS || status2 == IPADM_SUCCESS) {
1738 		if (status1 == IPADM_SUCCESS)
1739 			other = status2;
1740 		else
1741 			other = status1;
1742 		return (other == IPADM_ENXIO ? IPADM_SUCCESS : IPADM_FAILURE);
1743 	} else {
1744 		return (IPADM_FAILURE);
1745 	}
1746 }
1747 
1748 /*
1749  * Returns information about all interfaces in both active and persistent
1750  * configuration. If `ifname' is not NULL, it returns only the interface
1751  * identified by `ifname'.
1752  *
1753  * Return values:
1754  *	On success: IPADM_SUCCESS.
1755  *	On error  : IPADM_INVALID_ARG, IPADM_ENXIO or IPADM_FAILURE.
1756  */
1757 ipadm_status_t
ipadm_if_info(ipadm_handle_t iph,const char * ifname,ipadm_if_info_t ** if_info,uint32_t flags,int64_t lifc_flags)1758 ipadm_if_info(ipadm_handle_t iph, const char *ifname,
1759     ipadm_if_info_t **if_info, uint32_t flags, int64_t lifc_flags)
1760 {
1761 	ipadm_status_t	status;
1762 	ifspec_t	ifsp;
1763 
1764 	if (if_info == NULL || iph == NULL || flags != 0)
1765 		return (IPADM_INVALID_ARG);
1766 
1767 	if (ifname != NULL &&
1768 	    (!ifparse_ifspec(ifname, &ifsp) || ifsp.ifsp_lunvalid)) {
1769 		return (IPADM_INVALID_ARG);
1770 	}
1771 
1772 	status = i_ipadm_get_all_if_info(iph, ifname, if_info, lifc_flags);
1773 	if (status != IPADM_SUCCESS)
1774 		return (status);
1775 	if (ifname != NULL && *if_info == NULL)
1776 		return (IPADM_ENXIO);
1777 
1778 	return (IPADM_SUCCESS);
1779 }
1780 
1781 /*
1782  * Frees the linked list allocated by ipadm_if_info().
1783  */
1784 void
ipadm_free_if_info(ipadm_if_info_t * ifinfo)1785 ipadm_free_if_info(ipadm_if_info_t *ifinfo)
1786 {
1787 	ipadm_if_info_t	*ifinfo_next;
1788 
1789 	for (; ifinfo != NULL; ifinfo = ifinfo_next) {
1790 		ifinfo_next = ifinfo->ifi_next;
1791 		i_ipadm_free_ipmp_members(&ifinfo->ifi_ipmp_cmembers);
1792 		i_ipadm_free_ipmp_members(&ifinfo->ifi_ipmp_pmembers);
1793 		free(ifinfo);
1794 	}
1795 }
1796 
1797 static void
i_ipadm_free_ipmp_members(ipadm_ipmp_members_t * ipmp_members)1798 i_ipadm_free_ipmp_members(ipadm_ipmp_members_t *ipmp_members)
1799 {
1800 	ipadm_ipmp_member_t *ipmp_member;
1801 
1802 	while ((ipmp_member = list_remove_head(ipmp_members)) != NULL)
1803 		free(ipmp_member);
1804 
1805 	list_destroy(ipmp_members);
1806 }
1807 
1808 /*
1809  * Re-enable the interface `ifname' based on the saved configuration
1810  * for `ifname'.
1811  */
1812 ipadm_status_t
ipadm_enable_if(ipadm_handle_t iph,const char * ifname,uint32_t flags)1813 ipadm_enable_if(ipadm_handle_t iph, const char *ifname, uint32_t flags)
1814 {
1815 	boolean_t	set_init = B_FALSE;
1816 	nvlist_t	*ifnvl;
1817 	ipadm_status_t	status;
1818 	ifspec_t	ifsp;
1819 
1820 	/* Check for the required authorization */
1821 	if (!ipadm_check_auth())
1822 		return (IPADM_EAUTH);
1823 
1824 	/* Check for logical interfaces. */
1825 	if (!ifparse_ifspec(ifname, &ifsp) || ifsp.ifsp_lunvalid)
1826 		return (IPADM_INVALID_ARG);
1827 
1828 	/* Enabling an interface persistently is not supported. */
1829 	if (flags & IPADM_OPT_PERSIST)
1830 		return (IPADM_NOTSUP);
1831 
1832 	/*
1833 	 * Return early by checking if the interface is already enabled.
1834 	 */
1835 	if (ipadm_if_enabled(iph, ifname, AF_INET) &&
1836 	    ipadm_if_enabled(iph, ifname, AF_INET6))
1837 		return (IPADM_IF_EXISTS);
1838 
1839 	/*
1840 	 * Enable the interface and restore all its interface properties
1841 	 * and address objects.
1842 	 */
1843 	status = i_ipadm_init_ifs(iph, ifname, &ifnvl);
1844 	if (status != IPADM_SUCCESS)
1845 		return (status);
1846 
1847 	assert(ifnvl != NULL);
1848 	/*
1849 	 * ipadm_enable_if() does exactly what ipadm_init_ifs() does,
1850 	 * but only for one interface. We need to set IPH_INIT because
1851 	 * ipmgmtd daemon does not have to write the interface to the
1852 	 * persistent db. The interface is already available in the
1853 	 * persistent db and we are here to re-enable the persistent
1854 	 * configuration.
1855 	 *
1856 	 * But we need to make sure we're not accidentally clearing an
1857 	 * IPH_INIT flag that was already set when we were called.
1858 	 */
1859 	if ((iph->iph_flags & IPH_INIT) == 0) {
1860 		iph->iph_flags |= IPH_INIT;
1861 		set_init = B_TRUE;
1862 	}
1863 
1864 	status = i_ipadm_init_ifobj(iph, ifname, ifnvl);
1865 
1866 	if (set_init)
1867 		iph->iph_flags &= ~IPH_INIT;
1868 
1869 	nvlist_free(ifnvl);
1870 	return (status);
1871 }
1872 
1873 /*
1874  * Disable the interface `ifname' by removing it from the active configuration.
1875  * Error code return values follow the model in ipadm_delete_if()
1876  */
1877 ipadm_status_t
ipadm_disable_if(ipadm_handle_t iph,const char * ifname,uint32_t flags)1878 ipadm_disable_if(ipadm_handle_t iph, const char *ifname, uint32_t flags)
1879 {
1880 	ipadm_status_t	status1, status2, other;
1881 	ifspec_t	ifsp;
1882 
1883 	/* Check for the required authorization */
1884 	if (!ipadm_check_auth())
1885 		return (IPADM_EAUTH);
1886 
1887 	/* Check for logical interfaces. */
1888 	if (!ifparse_ifspec(ifname, &ifsp) || ifsp.ifsp_lunvalid)
1889 		return (IPADM_INVALID_ARG);
1890 
1891 	/* Disabling an interface persistently is not supported. */
1892 	if (flags & IPADM_OPT_PERSIST)
1893 		return (IPADM_NOTSUP);
1894 
1895 	status1 = i_ipadm_unplumb_if(iph, ifname, AF_INET6);
1896 	if (status1 == IPADM_SUCCESS)
1897 		status1 = i_ipadm_delete_ifobj(iph, ifname, AF_INET6, B_FALSE);
1898 	status2 = i_ipadm_unplumb_if(iph, ifname, AF_INET);
1899 	if (status2 == IPADM_SUCCESS)
1900 		status2 = i_ipadm_delete_ifobj(iph, ifname, AF_INET, B_FALSE);
1901 	if (status1 == status2) {
1902 		return (status2);
1903 	} else if (status1 == IPADM_SUCCESS || status2 == IPADM_SUCCESS) {
1904 		if (status1 == IPADM_SUCCESS)
1905 			other = status2;
1906 		else
1907 			other = status1;
1908 		return (other == IPADM_ENXIO ? IPADM_SUCCESS : IPADM_FAILURE);
1909 	} else {
1910 		return (IPADM_FAILURE);
1911 	}
1912 }
1913 
1914 /*
1915  * FIXME Remove this when ifconfig(8) is updated to use IPMP support
1916  * in libipadm.
1917  */
1918 /*
1919  * This workaround is required by ifconfig(8) whenever an
1920  * interface is moved into an IPMP group to update the daemon's
1921  * in-memory mapping of `aobjname' to 'lifnum'.
1922  *
1923  * For `IPMGMT_ACTIVE' case, i_ipadm_delete_ifobj() would only fail if
1924  * door_call(3C) fails. Also, there is no use in returning error because
1925  * `ifname' would have been successfuly moved into IPMP group, by this time.
1926  */
1927 void
ipadm_if_move(ipadm_handle_t iph,const char * ifname)1928 ipadm_if_move(ipadm_handle_t iph, const char *ifname)
1929 {
1930 	(void) i_ipadm_delete_ifobj(iph, ifname, AF_INET, B_FALSE);
1931 	(void) i_ipadm_delete_ifobj(iph, ifname, AF_INET6, B_FALSE);
1932 }
1933 
1934 ipadm_status_t
i_ipadm_set_groupname_active(ipadm_handle_t iph,const char * ifname,const char * groupname)1935 i_ipadm_set_groupname_active(ipadm_handle_t iph, const char *ifname,
1936     const char *groupname)
1937 {
1938 	struct lifreq   lifr;
1939 	ipadm_addr_info_t *addrinfo, *ia;
1940 	ipadm_status_t	status = IPADM_SUCCESS;
1941 
1942 	(void) memset(&lifr, 0, sizeof (lifr));
1943 
1944 	(void) strlcpy(lifr.lifr_name, ifname, sizeof (lifr.lifr_name));
1945 	(void) strlcpy(lifr.lifr_groupname, groupname,
1946 	    sizeof (lifr.lifr_groupname));
1947 
1948 	/* Disable all addresses on the interface */
1949 	(void) i_ipadm_active_addr_info(iph, ifname, &addrinfo,
1950 	    IPADM_OPT_ACTIVE | IPADM_OPT_ZEROADDR, IFF_UP | IFF_DUPLICATE);
1951 
1952 	for (ia = addrinfo; ia != NULL; ia = IA_NEXT(ia)) {
1953 		if (strlen(ia->ia_aobjname) > 0) {
1954 			(void) ipadm_disable_addr(iph, ia->ia_aobjname, 0);
1955 		} else {
1956 			/*
1957 			 * There's an address on this interfaces with no
1958 			 * corresponding addrobj. Just clear IFF_UP.
1959 			 */
1960 			(void) i_ipadm_set_flags(iph, ifname,
1961 			    addrinfo->ia_ifa.ifa_addr->sa_family, 0, IFF_UP);
1962 		}
1963 	}
1964 
1965 	if (ioctl(iph->iph_sock, SIOCSLIFGROUPNAME, (caddr_t)&lifr) == -1 &&
1966 	    ioctl(iph->iph_sock6, SIOCSLIFGROUPNAME, (caddr_t)&lifr) == -1)
1967 		status = ipadm_errno2status(errno);
1968 
1969 	/* Enable all addresses on the interface */
1970 	for (ia = addrinfo; ia != NULL; ia = IA_NEXT(ia)) {
1971 		if (strlen(ia->ia_aobjname) > 0) {
1972 			(void) ipadm_enable_addr(iph, ia->ia_aobjname, 0);
1973 		} else {
1974 			/*
1975 			 * There's an address on this interfaces with no
1976 			 * corresponding addrobj. Just set IFF_UP.
1977 			 */
1978 			(void) i_ipadm_set_flags(iph, ifname,
1979 			    addrinfo->ia_ifa.ifa_addr->sa_family, IFF_UP, 0);
1980 		}
1981 	}
1982 
1983 	if (status == IPADM_SUCCESS) {
1984 		if (groupname[0] == '\0') {
1985 			/*
1986 			 * If interface was removed from IPMP group, unset the
1987 			 * DEPRECATED and NOFAILOVER flags.
1988 			 */
1989 			(void) i_ipadm_set_flags(iph, ifname, AF_INET, 0,
1990 			    IFF_DEPRECATED | IFF_NOFAILOVER);
1991 			(void) i_ipadm_set_flags(iph, ifname, AF_INET6, 0,
1992 			    IFF_DEPRECATED | IFF_NOFAILOVER);
1993 		} else if (addrinfo == NULL) {
1994 			/*
1995 			 * If interface was added to IPMP group and there are no
1996 			 * active addresses, explicitly bring it up to be used
1997 			 * for link-based IPMP configuration.
1998 			 */
1999 			(void) i_ipadm_set_flags(iph, ifname, AF_INET,
2000 			    IFF_UP, 0);
2001 			(void) i_ipadm_set_flags(iph, ifname, AF_INET6,
2002 			    IFF_UP, 0);
2003 		}
2004 	}
2005 
2006 	ipadm_free_addr_info(addrinfo);
2007 
2008 	return (status);
2009 }
2010 
2011 ipadm_status_t
i_ipadm_get_groupname_active(ipadm_handle_t iph,const char * ifname,char * groupname,size_t size)2012 i_ipadm_get_groupname_active(ipadm_handle_t iph, const char *ifname,
2013     char *groupname, size_t size)
2014 {
2015 	struct lifreq   lifr;
2016 
2017 	(void) memset(&lifr, 0, sizeof (lifr));
2018 
2019 	(void) strlcpy(lifr.lifr_name, ifname, sizeof (lifr.lifr_name));
2020 
2021 	if (ioctl(iph->iph_sock, SIOCGLIFGROUPNAME, (caddr_t)&lifr) == -1 &&
2022 	    ioctl(iph->iph_sock6, SIOCGLIFGROUPNAME, (caddr_t)&lifr) == -1)
2023 		return (ipadm_errno2status(errno));
2024 
2025 	(void) strlcpy(groupname, lifr.lifr_groupname, size);
2026 
2027 	return (IPADM_SUCCESS);
2028 }
2029 
2030 /*
2031  * Returns B_TRUE if `ifname' represents an IPMP underlying interface.
2032  */
2033 boolean_t
i_ipadm_is_under_ipmp(ipadm_handle_t iph,const char * ifname)2034 i_ipadm_is_under_ipmp(ipadm_handle_t iph, const char *ifname)
2035 {
2036 
2037 	char	groupname[LIFGRNAMSIZ];
2038 
2039 	if (i_ipadm_get_groupname_active(iph, ifname, groupname,
2040 	    sizeof (groupname)) != IPADM_SUCCESS ||
2041 	    groupname[0] == '\0' ||
2042 	    strcmp(ifname, groupname) == 0)
2043 		return (B_FALSE);
2044 
2045 	return (B_TRUE);
2046 }
2047 
2048 /*
2049  * Returns B_TRUE if `ifname' represents an IPMP group interface.
2050  */
2051 boolean_t
i_ipadm_is_ipmp(ipadm_handle_t iph,const char * ifname)2052 i_ipadm_is_ipmp(ipadm_handle_t iph, const char *ifname)
2053 {
2054 	uint64_t flags;
2055 
2056 	if (i_ipadm_get_flags(iph, ifname, AF_INET, &flags) != IPADM_SUCCESS &&
2057 	    i_ipadm_get_flags(iph, ifname, AF_INET6, &flags) != IPADM_SUCCESS)
2058 		return (B_FALSE);
2059 
2060 	return ((flags & IFF_IPMP) != 0);
2061 }
2062