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	1	/*
	2	* Copyright (c) 2004-2010 Apple Inc. All rights reserved.
	3	*
	4	* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
	5	*
	6	* This file contains Original Code and/or Modifications of Original Code
	7	* as defined in and that are subject to the Apple Public Source License
	8	* Version 2.0 (the 'License'). You may not use this file except in
	9	* compliance with the License. The rights granted to you under the License
	10	* may not be used to create, or enable the creation or redistribution of,
	11	* unlawful or unlicensed copies of an Apple operating system, or to
	12	* circumvent, violate, or enable the circumvention or violation of, any
	13	* terms of an Apple operating system software license agreement.
	14	*
	15	* Please obtain a copy of the License at
	16	* http://www.opensource.apple.com/apsl/ and read it before using this file.
	17	*
	18	* The Original Code and all software distributed under the License are
	19	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	20	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	21	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	22	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	23	* Please see the License for the specific language governing rights and
	24	* limitations under the License.
	25	*
	26	* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
	27	*/
	28
	29	/*
	30	* multicast_util.c:
	31	* - keep track of multicast addresses added to one interface based on the
	32	* actual multicast addresses in another
	33	* - used by VLAN and BOND
	34	*/
	35
	36	/*
	37	* Modification History:
	38	*
	39	* April 29, 2004 Dieter Siegmund (dieter@apple.com)
	40	* - created
	41	*/
	42
	43	#include <net/multicast_list.h>
	44	#include <sys/param.h>
	45	#include <sys/systm.h>
	46	#include <sys/malloc.h>
	47	#include <net/if_dl.h>
	48
	49	__private_extern__ void
	50	multicast_list_init(struct multicast_list * mc_list)
	51	{
	52	SLIST_INIT(mc_list);
	53	return;
	54	}
	55
	56	/*
	57	* Function: multicast_list_remove
	58	* Purpose:
	59	* Remove the given list of multicast addresses from the interface and from
	60	* the multicast list structure.
	61	*/
	62	__private_extern__ int
	63	multicast_list_remove(struct multicast_list * mc_list)
	64	{
	65	int error;
	66	struct multicast_entry * mc;
	67	int result = 0;
	68
	69	while ((mc = SLIST_FIRST(mc_list)) != NULL) {
	70	error = ifnet_remove_multicast(mc->mc_ifma);
	71	if (error != 0) {
	72	result = error;
	73	}
	74	SLIST_REMOVE_HEAD(mc_list, mc_entries);
	75	ifmaddr_release(mc->mc_ifma);
	76	FREE(mc, M_DEVBUF);
	77	}
	78	return result;
	79	}
	80
	81	/*
	82	* Function: multicast_list_program
	83	* Purpose:
	84	* Program the multicast filter on "target_ifp" using the values from
	85	* "source_ifp", and saving the result in "mc_list"
	86	*
	87	* We build a new list of multicast addresses while programming the new list.
	88	* If that completes successfully, we remove the old list, and return the
	89	* new list.
	90	*
	91	* If it fails, we remove what we've added to the new list, and
	92	* return an error.
	93	*/
	94	__private_extern__ int
	95	multicast_list_program(struct multicast_list * mc_list,
	96	struct ifnet * source_ifp,
	97	struct ifnet * target_ifp)
	98	{
	99	int alen;
	100	int error = 0;
	101	int i;
	102	struct multicast_entry * mc = NULL;
	103	struct multicast_list new_mc_list;
	104	struct sockaddr_dl source_sdl;
	105	ifmultiaddr_t * source_multicast_list;
	106	struct sockaddr_dl target_sdl;
	107
	108	alen = target_ifp->if_addrlen;
	109	bzero((char *)&target_sdl, sizeof(target_sdl));
	110	target_sdl.sdl_len = sizeof(target_sdl);
	111	target_sdl.sdl_family = AF_LINK;
	112	target_sdl.sdl_type = target_ifp->if_type;
	113	target_sdl.sdl_alen = alen;
	114	target_sdl.sdl_index = target_ifp->if_index;
	115
	116	/* build a new list */
	117	multicast_list_init(&new_mc_list);
	118	error = ifnet_get_multicast_list(source_ifp, &source_multicast_list);
	119	if (error != 0) {
	120	printf("multicast_list_program: "
	121	"ifnet_get_multicast_list(%s%d) failed, %d\n",
	122	source_ifp->if_name, source_ifp->if_unit, error);
	123	return error;
	124	}
	125	for (i = 0; source_multicast_list[i] != NULL; i++) {
	126	if (ifmaddr_address(source_multicast_list[i],
	127	(struct sockaddr *)&source_sdl,
	128	sizeof(source_sdl)) != 0
	129	\|\| source_sdl.sdl_family != AF_LINK) {
	130	continue;
	131	}
	132	mc = _MALLOC(sizeof(struct multicast_entry), M_DEVBUF, M_WAITOK);
	133	if (mc == NULL) {
	134	error = ENOBUFS;
	135	break;
	136	}
	137	bcopy(LLADDR(&source_sdl), LLADDR(&target_sdl), alen);
	138	error = ifnet_add_multicast(target_ifp, (struct sockaddr *)&target_sdl,
	139	&mc->mc_ifma);
	140	if (error != 0) {
	141	FREE(mc, M_DEVBUF);
	142	break;
	143	}
	144	SLIST_INSERT_HEAD(&new_mc_list, mc, mc_entries);
	145	}
	146	if (error != 0) {
	147	/* restore previous state */
	148	(void)multicast_list_remove(&new_mc_list);
	149	} else {
	150	/* remove the old entries, and return the new list */
	151	(void)multicast_list_remove(mc_list);
	152	*mc_list = new_mc_list;
	153	}
	154	ifnet_free_multicast_list(source_multicast_list);
	155	return error;
	156	}