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 * $FreeBSD$ 26 */ 27 #include <sys/param.h> 28 #include <sys/ioctl.h> 29 30 #include <net/ethernet.h> 31 #include <net/if.h> 32 #include <net/if_bridgevar.h> 33 #include <net/route.h> 34 35 #include <assert.h> 36 #include <errno.h> 37 #include <stdbool.h> 38 #include <stdlib.h> 39 #include <string.h> 40 41 #include "libifconfig.h" 42 #include "libifconfig_internal.h" 43 44 /* Internal structure used for allocations and frees */ 45 struct _ifconfig_bridge_status { 46 struct ifconfig_bridge_status inner; /* wrapped bridge status */ 47 struct ifbropreq params; /* operational parameters */ 48 }; 49 50 static int 51 ifconfig_bridge_ioctlwrap(ifconfig_handle_t *h, const char *name, 52 unsigned long cmd, void *arg, size_t arglen, bool set) 53 { 54 struct ifdrv ifd = { 0 }; 55 unsigned long req = set ? SIOCSDRVSPEC : SIOCGDRVSPEC; 56 57 strlcpy(ifd.ifd_name, name, sizeof(ifd.ifd_name)); 58 ifd.ifd_cmd = cmd; 59 ifd.ifd_data = arg; 60 ifd.ifd_len = arglen; 61 62 return (ifconfig_ioctlwrap(h, AF_LOCAL, req, &ifd)); 63 } 64 65 int 66 ifconfig_bridge_get_bridge_status(ifconfig_handle_t *h, 67 const char *name, struct ifconfig_bridge_status **bridgep) 68 { 69 struct ifbifconf members; 70 struct ifbrparam cache_param; 71 struct _ifconfig_bridge_status *bridge; 72 char *buf; 73 74 *bridgep = NULL; 75 76 bridge = calloc(1, sizeof(struct _ifconfig_bridge_status)); 77 if (bridge == NULL) { 78 h->error.errtype = OTHER; 79 h->error.errcode = ENOMEM; 80 return (-1); 81 } 82 bridge->inner.params = &bridge->params; 83 84 if (ifconfig_bridge_ioctlwrap(h, name, BRDGGCACHE, 85 &cache_param, sizeof(cache_param), false) != 0) { 86 free(bridge); 87 return (-1); 88 } 89 bridge->inner.cache_size = cache_param.ifbrp_csize; 90 91 if (ifconfig_bridge_ioctlwrap(h, name, BRDGGTO, 92 &cache_param, sizeof(cache_param), false) != 0) { 93 free(bridge); 94 return (-1); 95 } 96 bridge->inner.cache_lifetime = cache_param.ifbrp_ctime; 97 98 if (ifconfig_bridge_ioctlwrap(h, name, BRDGPARAM, 99 &bridge->params, sizeof(bridge->params), false) != 0) { 100 free(bridge); 101 return (-1); 102 } 103 104 members.ifbic_buf = NULL; 105 for (size_t len = 8192; 106 (buf = realloc(members.ifbic_buf, len)) != NULL; 107 len *= 2) { 108 members.ifbic_buf = buf; 109 members.ifbic_len = len; 110 if (ifconfig_bridge_ioctlwrap(h, name, BRDGGIFS, 111 &members, sizeof(members), false) != 0) { 112 free(buf); 113 free(bridge); 114 return (-1); 115 } 116 if (members.ifbic_len <= len) 117 break; 118 } 119 if (buf == NULL) { 120 free(members.ifbic_buf); 121 free(bridge); 122 h->error.errtype = OTHER; 123 h->error.errcode = ENOMEM; 124 return (-1); 125 } 126 bridge->inner.members = members.ifbic_req; 127 bridge->inner.members_count = 128 members.ifbic_len / sizeof(*members.ifbic_req); 129 130 *bridgep = &bridge->inner; 131 132 return (0); 133 } 134 135 void 136 ifconfig_bridge_free_bridge_status(struct ifconfig_bridge_status *bridge) 137 { 138 if (bridge != NULL) { 139 free(bridge->members); 140 free(bridge); 141 } 142 } 143