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 | } |
157 | |