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 */
43struct _ifconfig_bridge_status {
44	struct ifconfig_bridge_status inner;	/* wrapped bridge status */
45	struct ifbropreq params;		/* operational parameters */
46};
47
48static int
49ifconfig_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
63int
64ifconfig_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;
70	char *buf;
71
72	*bridgep = NULL;
73
74	bridge = calloc(1, sizeof(struct _ifconfig_bridge_status));
75	if (bridge == NULL) {
76		h->error.errtype = OTHER;
77		h->error.errcode = ENOMEM;
78		return (-1);
79	}
80	bridge->inner.params = &bridge->params;
81
82	if (ifconfig_bridge_ioctlwrap(h, name, BRDGGCACHE,
83	    &cache_param, sizeof(cache_param), false) != 0) {
84		free(bridge);
85		return (-1);
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		free(bridge);
92		return (-1);
93	}
94	bridge->inner.cache_lifetime = cache_param.ifbrp_ctime;
95
96	if (ifconfig_bridge_ioctlwrap(h, name, BRDGPARAM,
97	    &bridge->params, sizeof(bridge->params), false) != 0) {
98		free(bridge);
99		return (-1);
100	}
101
102	members.ifbic_buf = NULL;
103	for (size_t len = 8192;
104	    (buf = realloc(members.ifbic_buf, len)) != NULL;
105	    len *= 2) {
106		members.ifbic_buf = buf;
107		members.ifbic_len = len;
108		if (ifconfig_bridge_ioctlwrap(h, name, BRDGGIFS,
109		    &members, sizeof(members), false) != 0) {
110			free(buf);
111			free(bridge);
112			return (-1);
113		}
114		if ((members.ifbic_len + sizeof(*members.ifbic_req)) < len)
115			break;
116	}
117	if (buf == NULL) {
118		free(members.ifbic_buf);
119		free(bridge);
120		h->error.errtype = OTHER;
121		h->error.errcode = ENOMEM;
122		return (-1);
123	}
124	bridge->inner.members = members.ifbic_req;
125	bridge->inner.members_count =
126	    members.ifbic_len / sizeof(*members.ifbic_req);
127
128	*bridgep = &bridge->inner;
129
130	return (0);
131}
132
133void
134ifconfig_bridge_free_bridge_status(struct ifconfig_bridge_status *bridge)
135{
136	if (bridge != NULL) {
137		free(bridge->members);
138		free(bridge);
139	}
140}
141