1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1983, 1988, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #include <sys/param.h> 34 #include <sys/protosw.h> 35 #include <sys/socket.h> 36 #include <sys/socketvar.h> 37 #include <sys/sysctl.h> 38 #include <sys/time.h> 39 40 #include <net/ethernet.h> 41 #include <net/if.h> 42 #include <net/if_dl.h> 43 #include <net/if_types.h> 44 #include <netlink/netlink.h> 45 #include <netlink/netlink_route.h> 46 #include <netlink/netlink_snl.h> 47 #include <netlink/netlink_snl_route.h> 48 #include <netlink/netlink_snl_route_parsers.h> 49 #include <netlink/netlink_snl_route_compat.h> 50 51 #include <netinet/in.h> 52 #include <netgraph/ng_socket.h> 53 54 #include <arpa/inet.h> 55 #include <ifaddrs.h> 56 #include <libutil.h> 57 #include <netdb.h> 58 #include <stdbool.h> 59 #include <stdint.h> 60 #include <stdio.h> 61 #include <stdlib.h> 62 #include <stdbool.h> 63 #include <string.h> 64 #include <sysexits.h> 65 #include <unistd.h> 66 #include <err.h> 67 #include <libxo/xo.h> 68 #include "netstat.h" 69 #include "common.h" 70 #include "nl_defs.h" 71 72 73 static void p_rtentry_netlink(struct snl_state *ss, const char *name, struct nlmsghdr *hdr); 74 75 static struct ifmap_entry *ifmap; 76 static size_t ifmap_size; 77 78 /* Generate ifmap using netlink */ 79 static struct ifmap_entry * 80 prepare_ifmap_netlink(struct snl_state *ss, size_t *pifmap_size) 81 { 82 struct { 83 struct nlmsghdr hdr; 84 struct ifinfomsg ifmsg; 85 } msg = { 86 .hdr.nlmsg_type = RTM_GETLINK, 87 .hdr.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST, 88 .hdr.nlmsg_seq = snl_get_seq(ss), 89 }; 90 msg.hdr.nlmsg_len = sizeof(msg); 91 92 if (!snl_send_message(ss, &msg.hdr)) 93 return (NULL); 94 95 struct ifmap_entry *ifmap = NULL; 96 uint32_t ifmap_size = 0; 97 struct nlmsghdr *hdr; 98 struct snl_errmsg_data e = {}; 99 100 while ((hdr = snl_read_reply_multi(ss, msg.hdr.nlmsg_seq, &e)) != NULL) { 101 struct snl_parsed_link_simple link = {}; 102 103 if (!snl_parse_nlmsg(ss, hdr, &snl_rtm_link_parser_simple, &link)) 104 continue; 105 if (link.ifi_index >= ifmap_size) { 106 size_t size = roundup2(link.ifi_index + 1, 32) * sizeof(struct ifmap_entry); 107 if ((ifmap = realloc(ifmap, size)) == NULL) 108 errx(2, "realloc(%zu) failed", size); 109 memset(&ifmap[ifmap_size], 0, 110 size - ifmap_size * 111 sizeof(struct ifmap_entry)); 112 ifmap_size = roundup2(link.ifi_index + 1, 32); 113 } 114 if (*ifmap[link.ifi_index].ifname != '\0') 115 continue; 116 strlcpy(ifmap[link.ifi_index].ifname, link.ifla_ifname, IFNAMSIZ); 117 ifmap[link.ifi_index].mtu = link.ifla_mtu; 118 } 119 *pifmap_size = ifmap_size; 120 return (ifmap); 121 } 122 123 static void 124 ip6_writemask(struct in6_addr *addr6, uint8_t mask) 125 { 126 uint32_t *cp; 127 128 for (cp = (uint32_t *)addr6; mask >= 32; mask -= 32) 129 *cp++ = 0xFFFFFFFF; 130 if (mask > 0) 131 *cp = htonl(mask ? ~((1 << (32 - mask)) - 1) : 0); 132 } 133 134 static void 135 gen_mask(int family, int plen, struct sockaddr *sa) 136 { 137 if (family == AF_INET6) { 138 struct sockaddr_in6 sin6 = { 139 .sin6_family = AF_INET6, 140 .sin6_len = sizeof(struct sockaddr_in6), 141 }; 142 ip6_writemask(&sin6.sin6_addr, plen); 143 *((struct sockaddr_in6 *)sa) = sin6; 144 } else if (family == AF_INET) { 145 struct sockaddr_in sin = { 146 .sin_family = AF_INET, 147 .sin_len = sizeof(struct sockaddr_in), 148 .sin_addr.s_addr = htonl(plen ? ~((1 << (32 - plen)) - 1) : 0), 149 }; 150 *((struct sockaddr_in *)sa) = sin; 151 } 152 } 153 154 static void 155 add_scopeid(struct sockaddr *sa, int ifindex) 156 { 157 if (sa->sa_family == AF_INET6) { 158 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa; 159 if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) 160 sin6->sin6_scope_id = ifindex; 161 } 162 } 163 164 static void 165 p_path(struct snl_parsed_route *rt, bool is_mpath) 166 { 167 struct sockaddr_in6 mask6; 168 struct sockaddr *pmask = (struct sockaddr *)&mask6; 169 char buffer[128]; 170 char prettyname[128]; 171 int protrusion; 172 173 gen_mask(rt->rtm_family, rt->rtm_dst_len, pmask); 174 add_scopeid(rt->rta_dst, rt->rta_oif); 175 add_scopeid(rt->rta_gw, rt->rta_oif); 176 protrusion = p_sockaddr("destination", rt->rta_dst, pmask, rt->rta_rtflags, wid.dst); 177 protrusion = p_sockaddr("gateway", rt->rta_gw, NULL, RTF_HOST, 178 wid.gw - protrusion); 179 snprintf(buffer, sizeof(buffer), "{[:-%d}{:flags/%%s}{]:} ", 180 wid.flags - protrusion); 181 p_flags(rt->rta_rtflags | RTF_UP, buffer); 182 /* Output path weight as non-visual property */ 183 xo_emit("{e:weight/%u}", rt->rtax_weight); 184 if (is_mpath) 185 xo_emit("{e:nhg-kidx/%u}", rt->rta_knh_id); 186 else 187 xo_emit("{e:nhop-kidx/%u}", rt->rta_knh_id); 188 if (rt->rta_nh_id != 0) { 189 if (is_mpath) 190 xo_emit("{e:nhg-uidx/%u}", rt->rta_nh_id); 191 else 192 xo_emit("{e:nhop-uidx/%u}", rt->rta_nh_id); 193 } 194 195 memset(prettyname, 0, sizeof(prettyname)); 196 if (rt->rta_oif < ifmap_size) { 197 strlcpy(prettyname, ifmap[rt->rta_oif].ifname, 198 sizeof(prettyname)); 199 if (*prettyname == '\0') 200 strlcpy(prettyname, "---", sizeof(prettyname)); 201 if (rt->rtax_mtu == 0) 202 rt->rtax_mtu = ifmap[rt->rta_oif].mtu; 203 } 204 205 if (Wflag) { 206 /* XXX: use=0? */ 207 xo_emit("{t:nhop/%*lu} ", wid.mtu, is_mpath ? 0 : rt->rta_knh_id); 208 209 if (rt->rtax_mtu != 0) 210 xo_emit("{t:mtu/%*lu} ", wid.mtu, rt->rtax_mtu); 211 else { 212 /* use interface mtu */ 213 xo_emit("{P:/%*s} ", wid.mtu, ""); 214 } 215 216 } 217 218 if (Wflag) 219 xo_emit("{t:interface-name/%*s}", wid.iface, prettyname); 220 else 221 xo_emit("{t:interface-name/%*.*s}", wid.iface, wid.iface, 222 prettyname); 223 if (rt->rta_expires > 0) { 224 xo_emit(" {:expire-time/%*u}", wid.expire, rt->rta_expires); 225 } 226 } 227 228 static void 229 p_rtentry_netlink(struct snl_state *ss, const char *name, struct nlmsghdr *hdr) 230 { 231 232 struct snl_parsed_route rt = {}; 233 if (!snl_parse_nlmsg(ss, hdr, &snl_rtm_route_parser, &rt)) 234 return; 235 if (rt.rtax_weight == 0) 236 rt.rtax_weight = rt_default_weight; 237 238 if (rt.rta_multipath.num_nhops != 0) { 239 uint32_t orig_rtflags = rt.rta_rtflags; 240 uint32_t orig_mtu = rt.rtax_mtu; 241 for (uint32_t i = 0; i < rt.rta_multipath.num_nhops; i++) { 242 struct rta_mpath_nh *nhop = rt.rta_multipath.nhops[i]; 243 244 rt.rta_gw = nhop->gw; 245 rt.rta_oif = nhop->ifindex; 246 rt.rtax_weight = nhop->rtnh_weight; 247 rt.rta_rtflags = nhop->rta_rtflags ? nhop->rta_rtflags : orig_rtflags; 248 rt.rtax_mtu = nhop->rtax_mtu ? nhop->rtax_mtu : orig_mtu; 249 250 xo_open_instance(name); 251 p_path(&rt, true); 252 xo_emit("\n"); 253 xo_close_instance(name); 254 } 255 return; 256 } 257 258 struct sockaddr_dl sdl_gw = { 259 .sdl_family = AF_LINK, 260 .sdl_len = sizeof(struct sockaddr_dl), 261 .sdl_index = rt.rta_oif, 262 }; 263 if (rt.rta_gw == NULL) 264 rt.rta_gw = (struct sockaddr *)&sdl_gw; 265 266 xo_open_instance(name); 267 p_path(&rt, false); 268 xo_emit("\n"); 269 xo_close_instance(name); 270 } 271 272 bool 273 p_rtable_netlink(int fibnum, int af) 274 { 275 int fam = AF_UNSPEC; 276 int need_table_close = false; 277 struct nlmsghdr *hdr; 278 struct snl_errmsg_data e = {}; 279 struct snl_state ss = {}; 280 281 if (!snl_init(&ss, NETLINK_ROUTE)) 282 return (false); 283 284 ifmap = prepare_ifmap_netlink(&ss, &ifmap_size); 285 if (ifmap == NULL) { 286 snl_free(&ss); 287 return (false); 288 } 289 290 struct { 291 struct nlmsghdr hdr; 292 struct rtmsg rtmsg; 293 struct nlattr nla_fibnum; 294 uint32_t fibnum; 295 } msg = { 296 .hdr.nlmsg_type = RTM_GETROUTE, 297 .hdr.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST, 298 .hdr.nlmsg_seq = snl_get_seq(&ss), 299 .rtmsg.rtm_family = af, 300 .nla_fibnum.nla_len = sizeof(struct nlattr) + sizeof(uint32_t), 301 .nla_fibnum.nla_type = RTA_TABLE, 302 .fibnum = fibnum, 303 }; 304 msg.hdr.nlmsg_len = sizeof(msg); 305 306 if (!snl_send_message(&ss, &msg.hdr)) { 307 snl_free(&ss); 308 return (false); 309 } 310 311 xo_open_container("route-table"); 312 xo_open_list("rt-family"); 313 while ((hdr = snl_read_reply_multi(&ss, msg.hdr.nlmsg_seq, &e)) != NULL) { 314 struct rtmsg *rtm = (struct rtmsg *)(hdr + 1); 315 /* Only print family first time. */ 316 if (fam != rtm->rtm_family) { 317 if (need_table_close) { 318 xo_close_list("rt-entry"); 319 xo_close_instance("rt-family"); 320 } 321 need_table_close = true; 322 fam = rtm->rtm_family; 323 set_wid(fam); 324 xo_open_instance("rt-family"); 325 pr_family(fam); 326 xo_open_list("rt-entry"); 327 pr_rthdr(fam); 328 } 329 p_rtentry_netlink(&ss, "rt-entry", hdr); 330 snl_clear_lb(&ss); 331 } 332 if (need_table_close) { 333 xo_close_list("rt-entry"); 334 xo_close_instance("rt-family"); 335 } 336 xo_close_list("rt-family"); 337 xo_close_container("route-table"); 338 snl_free(&ss); 339 return (true); 340 } 341 342 343