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/types.h> 32 #include <sys/dnv.h> 33 #include <sys/ioctl.h> 34 #include <sys/nv.h> 35 #include <sys/queue.h> 36 37 #include <net/if.h> 38 #include <netinet/in.h> 39 #include <netinet6/in6_var.h> 40 41 #include <errno.h> 42 #include <ifaddrs.h> 43 #include <string.h> 44 #include <unistd.h> 45 46 #include <libcasper.h> 47 #include <libcasper_service.h> 48 49 #include "rtsold.h" 50 51 /* 52 * A service to fetch the flags for the link-local IPv6 address on the specified 53 * interface. This cannot easily be done in capability mode because we need to 54 * use the routing socket sysctl API to find the link-local address of a 55 * particular interface. The SIOCGIFCONF ioctl is one other option, but as 56 * currently implemented it is less flexible (it cannot report the required 57 * buffer length), and hard-codes a buffer length limit. 58 */ 59 60 static int 61 llflags_get(const char *ifname, int *flagsp) 62 { 63 struct in6_ifreq ifr6; 64 struct ifaddrs *ifap, *ifa; 65 struct sockaddr_in6 *sin6; 66 int error, s; 67 68 s = socket(PF_INET6, SOCK_DGRAM, 0); 69 if (s < 0) 70 return (-1); 71 72 ifap = NULL; 73 if (getifaddrs(&ifap) != 0) { 74 error = errno; 75 goto out; 76 } 77 error = ENOENT; 78 for (ifa = ifap; ifa != NULL; ifa = ifa->ifa_next) { 79 if (strcmp(ifa->ifa_name, ifname) != 0) 80 continue; 81 if (ifa->ifa_addr->sa_family != AF_INET6) 82 continue; 83 84 sin6 = (struct sockaddr_in6 *)(void *)ifa->ifa_addr; 85 if (!IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) 86 continue; 87 88 memset(&ifr6, 0, sizeof(ifr6)); 89 if (strlcpy(ifr6.ifr_name, ifname, sizeof(ifr6.ifr_name)) >= 90 sizeof(ifr6.ifr_name)) { 91 error = EINVAL; 92 goto out; 93 } 94 memcpy(&ifr6.ifr_ifru.ifru_addr, sin6, sin6->sin6_len); 95 if (ioctl(s, SIOCGIFAFLAG_IN6, &ifr6) < 0) { 96 error = errno; 97 goto out; 98 } 99 100 *flagsp = ifr6.ifr_ifru.ifru_flags6; 101 error = 0; 102 break; 103 } 104 out: 105 (void)close(s); 106 if (ifap != NULL) 107 freeifaddrs(ifap); 108 if (error != 0) { 109 errno = error; 110 return (-1); 111 } else { 112 return (0); 113 } 114 } 115 116 int 117 cap_llflags_get(cap_channel_t *cap, const char *ifname, int *flagsp) 118 { 119 #ifdef WITH_CASPER 120 nvlist_t *nvl; 121 int error; 122 123 nvl = nvlist_create(0); 124 nvlist_add_string(nvl, "cmd", "get"); 125 nvlist_add_string(nvl, "ifname", ifname); 126 nvl = cap_xfer_nvlist(cap, nvl); 127 if (nvl == NULL) 128 return (-1); 129 error = (int)dnvlist_get_number(nvl, "error", 0); 130 if (error == 0) 131 *flagsp = (int)nvlist_get_number(nvl, "flags"); 132 nvlist_destroy(nvl); 133 if (error != 0) 134 errno = error; 135 return (error == 0 ? 0 : -1); 136 #else 137 (void)cap; 138 return (llflags_get(ifname, flagsp)); 139 #endif 140 } 141 142 #ifdef WITH_CASPER 143 static int 144 llflags_command(const char *cmd, const nvlist_t *limits __unused, 145 nvlist_t *nvlin, nvlist_t *nvlout) 146 { 147 const char *ifname; 148 int flags; 149 150 if (strcmp(cmd, "get") != 0) 151 return (EINVAL); 152 ifname = nvlist_get_string(nvlin, "ifname"); 153 if (llflags_get(ifname, &flags) != 0) 154 return (errno); 155 nvlist_add_number(nvlout, "flags", flags); 156 return (0); 157 } 158 159 CREATE_SERVICE("rtsold.llflags", NULL, llflags_command, 0); 160 #endif /* WITH_CASPER */ 161