1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2018 The FreeBSD Foundation 5 * 6 * This software was developed by Mark Johnston under sponsorship from 7 * the FreeBSD Foundation. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions are 11 * met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in 16 * the documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 #include <sys/cdefs.h> 32 __FBSDID("$FreeBSD$"); 33 34 #include <sys/types.h> 35 #include <sys/dnv.h> 36 #include <sys/ioctl.h> 37 #include <sys/nv.h> 38 #include <sys/queue.h> 39 40 #include <net/if.h> 41 #include <netinet/in.h> 42 #include <netinet6/in6_var.h> 43 44 #include <errno.h> 45 #include <ifaddrs.h> 46 #include <string.h> 47 #include <unistd.h> 48 49 #include <libcasper.h> 50 #include <libcasper_service.h> 51 52 #include "rtsold.h" 53 54 /* 55 * A service to fetch the flags for the link-local IPv6 address on the specified 56 * interface. This cannot easily be done in capability mode because we need to 57 * use the routing socket sysctl API to find the link-local address of a 58 * particular interface. The SIOCGIFCONF ioctl is one other option, but as 59 * currently implemented it is less flexible (it cannot report the required 60 * buffer length), and hard-codes a buffer length limit. 61 */ 62 63 static int 64 llflags_get(const char *ifname, int *flagsp) 65 { 66 struct in6_ifreq ifr6; 67 struct ifaddrs *ifap, *ifa; 68 struct sockaddr_in6 *sin6; 69 int error, s; 70 71 s = socket(PF_INET6, SOCK_DGRAM, 0); 72 if (s < 0) 73 return (-1); 74 75 ifap = NULL; 76 if (getifaddrs(&ifap) != 0) { 77 error = errno; 78 goto out; 79 } 80 error = ENOENT; 81 for (ifa = ifap; ifa != NULL; ifa = ifa->ifa_next) { 82 if (strcmp(ifa->ifa_name, ifname) != 0) 83 continue; 84 if (ifa->ifa_addr->sa_family != AF_INET6) 85 continue; 86 87 sin6 = (struct sockaddr_in6 *)(void *)ifa->ifa_addr; 88 if (!IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) 89 continue; 90 91 memset(&ifr6, 0, sizeof(ifr6)); 92 if (strlcpy(ifr6.ifr_name, ifname, sizeof(ifr6.ifr_name)) >= 93 sizeof(ifr6.ifr_name)) { 94 error = errno; 95 goto out; 96 } 97 memcpy(&ifr6.ifr_ifru.ifru_addr, sin6, sin6->sin6_len); 98 if (ioctl(s, SIOCGIFAFLAG_IN6, &ifr6) < 0) { 99 error = errno; 100 goto out; 101 } 102 103 *flagsp = ifr6.ifr_ifru.ifru_flags6; 104 error = 0; 105 break; 106 } 107 out: 108 (void)close(s); 109 if (ifap != NULL) 110 freeifaddrs(ifap); 111 if (error != 0) { 112 errno = error; 113 return (-1); 114 } else { 115 return (0); 116 } 117 } 118 119 int 120 cap_llflags_get(cap_channel_t *cap, const char *ifname, int *flagsp) 121 { 122 #ifdef WITH_CASPER 123 nvlist_t *nvl; 124 int error; 125 126 nvl = nvlist_create(0); 127 nvlist_add_string(nvl, "cmd", "get"); 128 nvlist_add_string(nvl, "ifname", ifname); 129 nvl = cap_xfer_nvlist(cap, nvl); 130 if (nvl == NULL) 131 return (-1); 132 error = (int)dnvlist_get_number(nvl, "error", 0); 133 if (error == 0) 134 *flagsp = (int)nvlist_get_number(nvl, "flags"); 135 nvlist_destroy(nvl); 136 if (error != 0) 137 errno = error; 138 return (error == 0 ? 0 : -1); 139 #else 140 (void)cap; 141 return (llflags_get(ifname, flagsp)); 142 #endif 143 } 144 145 #ifdef WITH_CASPER 146 static int 147 llflags_command(const char *cmd, const nvlist_t *limits __unused, 148 nvlist_t *nvlin, nvlist_t *nvlout) 149 { 150 const char *ifname; 151 int flags; 152 153 if (strcmp(cmd, "get") != 0) 154 return (EINVAL); 155 ifname = nvlist_get_string(nvlin, "ifname"); 156 if (llflags_get(ifname, &flags) != 0) 157 return (errno); 158 nvlist_add_number(nvlout, "flags", flags); 159 return (0); 160 } 161 162 CREATE_SERVICE("rtsold.llflags", NULL, llflags_command, 0); 163 #endif /* WITH_CASPER */ 164