1 /*
2 * Copyright (c) 2020, Ryan Moeller <freqlabs@FreeBSD.org>
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
23 * SUCH DAMAGE.
24 */
25 #include <sys/param.h>
26 #include <sys/ioctl.h>
27
28 #include <net/ethernet.h>
29 #include <net/if.h>
30 #include <net/if_bridgevar.h>
31 #include <net/route.h>
32
33 #include <assert.h>
34 #include <errno.h>
35 #include <stdbool.h>
36 #include <stdlib.h>
37 #include <string.h>
38
39 #include "libifconfig.h"
40 #include "libifconfig_internal.h"
41
42 /* Internal structure used for allocations and frees */
43 struct _ifconfig_bridge_status {
44 struct ifconfig_bridge_status inner; /* wrapped bridge status */
45 struct ifbropreq params; /* operational parameters */
46 };
47
48 static int
ifconfig_bridge_ioctlwrap(ifconfig_handle_t * h,const char * name,unsigned long cmd,void * arg,size_t arglen,bool set)49 ifconfig_bridge_ioctlwrap(ifconfig_handle_t *h, const char *name,
50 unsigned long cmd, void *arg, size_t arglen, bool set)
51 {
52 struct ifdrv ifd = { 0 };
53 unsigned long req = set ? SIOCSDRVSPEC : SIOCGDRVSPEC;
54
55 strlcpy(ifd.ifd_name, name, sizeof(ifd.ifd_name));
56 ifd.ifd_cmd = cmd;
57 ifd.ifd_data = arg;
58 ifd.ifd_len = arglen;
59
60 return (ifconfig_ioctlwrap(h, AF_LOCAL, req, &ifd));
61 }
62
63 int
ifconfig_bridge_get_bridge_status(ifconfig_handle_t * h,const char * name,struct ifconfig_bridge_status ** bridgep)64 ifconfig_bridge_get_bridge_status(ifconfig_handle_t *h,
65 const char *name, struct ifconfig_bridge_status **bridgep)
66 {
67 struct ifbifconf members;
68 struct ifbrparam cache_param;
69 struct _ifconfig_bridge_status *bridge = NULL;
70 char *buf = NULL;
71
72 members.ifbic_buf = NULL;
73 *bridgep = NULL;
74
75 bridge = calloc(1, sizeof(struct _ifconfig_bridge_status));
76 if (bridge == NULL) {
77 h->error.errtype = OTHER;
78 h->error.errcode = ENOMEM;
79 goto err;
80 }
81 bridge->inner.params = &bridge->params;
82
83 if (ifconfig_bridge_ioctlwrap(h, name, BRDGGCACHE,
84 &cache_param, sizeof(cache_param), false) != 0) {
85 goto err;
86 }
87 bridge->inner.cache_size = cache_param.ifbrp_csize;
88
89 if (ifconfig_bridge_ioctlwrap(h, name, BRDGGTO,
90 &cache_param, sizeof(cache_param), false) != 0) {
91 goto err;
92 }
93 bridge->inner.cache_lifetime = cache_param.ifbrp_ctime;
94
95 if (ifconfig_bridge_ioctlwrap(h, name, BRDGPARAM,
96 &bridge->params, sizeof(bridge->params), false) != 0) {
97 goto err;
98 }
99
100 for (size_t len = 8192;
101 (buf = realloc(members.ifbic_buf, len)) != NULL;
102 len *= 2) {
103 members.ifbic_buf = buf;
104 members.ifbic_len = len;
105 if (ifconfig_bridge_ioctlwrap(h, name, BRDGGIFS,
106 &members, sizeof(members), false) != 0) {
107 goto err;
108 }
109 if ((members.ifbic_len + sizeof(*members.ifbic_req)) < len)
110 break;
111 }
112 if (buf == NULL) {
113 h->error.errtype = OTHER;
114 h->error.errcode = ENOMEM;
115 goto err;
116 }
117 bridge->inner.members = members.ifbic_req;
118 bridge->inner.members_count =
119 members.ifbic_len / sizeof(*members.ifbic_req);
120
121 bridge->inner.member_vlans = calloc(bridge->inner.members_count,
122 sizeof(ifbvlan_set_t));
123 if (bridge->inner.member_vlans == NULL) {
124 h->error.errtype = OTHER;
125 h->error.errcode = ENOMEM;
126 goto err;
127 }
128 for (size_t i = 0; i < bridge->inner.members_count; ++i) {
129 struct ifbif_vlan_req vreq;
130 memset(&vreq, 0, sizeof(vreq));
131 strlcpy(vreq.bv_ifname, bridge->inner.members[i].ifbr_ifsname,
132 sizeof(vreq.bv_ifname));
133
134 if (ifconfig_bridge_ioctlwrap(h, name, BRDGGIFVLANSET, &vreq,
135 sizeof(vreq), false) != 0) {
136 goto err;
137 }
138
139 __BIT_COPY(BRVLAN_SETSIZE, &vreq.bv_set,
140 &bridge->inner.member_vlans[i]);
141 }
142
143 *bridgep = &bridge->inner;
144
145 return (0);
146
147 err:
148 free(members.ifbic_buf);
149 if (bridge)
150 free(bridge->inner.member_vlans);
151 free(bridge);
152 return (-1);
153 }
154
155 void
ifconfig_bridge_free_bridge_status(struct ifconfig_bridge_status * bridge)156 ifconfig_bridge_free_bridge_status(struct ifconfig_bridge_status *bridge)
157 {
158 if (bridge != NULL) {
159 free(bridge->members);
160 free(bridge);
161 }
162 }
163