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 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 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; 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 <= 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 } 132 133 void 134 ifconfig_bridge_free_bridge_status(struct ifconfig_bridge_status *bridge) 135 { 136 if (bridge != NULL) { 137 free(bridge->members); 138 free(bridge); 139 } 140 } 141