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/param.h> 33 #include <sys/protosw.h> 34 #include <sys/socket.h> 35 #include <sys/socketvar.h> 36 #include <sys/sysctl.h> 37 #include <sys/time.h> 38 39 #include <net/ethernet.h> 40 #include <net/if.h> 41 #include <net/if_dl.h> 42 #include <net/if_types.h> 43 #include <netlink/netlink.h> 44 #include <netlink/netlink_route.h> 45 #include <netlink/netlink_snl.h> 46 #include <netlink/netlink_snl_route.h> 47 #include <netlink/netlink_snl_route_parsers.h> 48 #include <netlink/netlink_snl_route_compat.h> 49 50 #include <netinet/in.h> 51 #include <netgraph/ng_socket.h> 52 53 #include <arpa/inet.h> 54 #include <ifaddrs.h> 55 #include <libutil.h> 56 #include <netdb.h> 57 #include <stdbool.h> 58 #include <stdint.h> 59 #include <stdio.h> 60 #include <stdlib.h> 61 #include <stdbool.h> 62 #include <string.h> 63 #include <sysexits.h> 64 #include <unistd.h> 65 #include <err.h> 66 #include <libxo/xo.h> 67 #include "netstat.h" 68 #include "common.h" 69 #include "nl_defs.h" 70 71 72 static void p_rtentry_netlink(struct snl_state *ss, const char *name, struct nlmsghdr *hdr); 73 74 static struct ifmap_entry *ifmap; 75 static size_t ifmap_size; 76 77 /* Generate ifmap using netlink */ 78 static struct ifmap_entry * 79 prepare_ifmap_netlink(struct snl_state *ss, size_t *pifmap_size) 80 { 81 struct { 82 struct nlmsghdr hdr; 83 struct ifinfomsg ifmsg; 84 } msg = { 85 .hdr.nlmsg_type = RTM_GETLINK, 86 .hdr.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST, 87 .hdr.nlmsg_seq = snl_get_seq(ss), 88 }; 89 msg.hdr.nlmsg_len = sizeof(msg); 90 91 if (!snl_send_message(ss, &msg.hdr)) 92 return (NULL); 93 94 struct ifmap_entry *ifmap = NULL; 95 uint32_t ifmap_size = 0; 96 struct nlmsghdr *hdr; 97 struct snl_errmsg_data e = {}; 98 99 while ((hdr = snl_read_reply_multi(ss, msg.hdr.nlmsg_seq, &e)) != NULL) { 100 struct snl_parsed_link_simple link = {}; 101 102 if (!snl_parse_nlmsg(ss, hdr, &snl_rtm_link_parser_simple, &link)) 103 continue; 104 if (link.ifi_index >= ifmap_size) { 105 size_t size = roundup2(link.ifi_index + 1, 32) * sizeof(struct ifmap_entry); 106 if ((ifmap = realloc(ifmap, size)) == NULL) 107 errx(2, "realloc(%zu) failed", size); 108 memset(&ifmap[ifmap_size], 0, 109 size - ifmap_size * 110 sizeof(struct ifmap_entry)); 111 ifmap_size = roundup2(link.ifi_index + 1, 32); 112 } 113 if (*ifmap[link.ifi_index].ifname != '\0') 114 continue; 115 strlcpy(ifmap[link.ifi_index].ifname, link.ifla_ifname, IFNAMSIZ); 116 ifmap[link.ifi_index].mtu = link.ifla_mtu; 117 } 118 *pifmap_size = ifmap_size; 119 return (ifmap); 120 } 121 122 static void 123 ip6_writemask(struct in6_addr *addr6, uint8_t mask) 124 { 125 uint32_t *cp; 126 127 for (cp = (uint32_t *)addr6; mask >= 32; mask -= 32) 128 *cp++ = 0xFFFFFFFF; 129 if (mask > 0) 130 *cp = htonl(mask ? ~((1 << (32 - mask)) - 1) : 0); 131 } 132 133 static void 134 gen_mask(int family, int plen, struct sockaddr *sa) 135 { 136 if (family == AF_INET6) { 137 struct sockaddr_in6 sin6 = { 138 .sin6_family = AF_INET6, 139 .sin6_len = sizeof(struct sockaddr_in6), 140 }; 141 ip6_writemask(&sin6.sin6_addr, plen); 142 *((struct sockaddr_in6 *)sa) = sin6; 143 } else if (family == AF_INET) { 144 struct sockaddr_in sin = { 145 .sin_family = AF_INET, 146 .sin_len = sizeof(struct sockaddr_in), 147 .sin_addr.s_addr = htonl(plen ? ~((1 << (32 - plen)) - 1) : 0), 148 }; 149 *((struct sockaddr_in *)sa) = sin; 150 } 151 } 152 153 static void 154 add_scopeid(struct sockaddr *sa, int ifindex) 155 { 156 if (sa->sa_family == AF_INET6) { 157 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa; 158 if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) 159 sin6->sin6_scope_id = ifindex; 160 } 161 } 162 163 static void 164 p_path(struct snl_parsed_route *rt, bool is_mpath) 165 { 166 struct sockaddr_in6 mask6; 167 struct sockaddr *pmask = (struct sockaddr *)&mask6; 168 char buffer[128]; 169 char prettyname[128]; 170 int protrusion; 171 172 gen_mask(rt->rtm_family, rt->rtm_dst_len, pmask); 173 add_scopeid(rt->rta_dst, rt->rta_oif); 174 add_scopeid(rt->rta_gw, rt->rta_oif); 175 protrusion = p_sockaddr("destination", rt->rta_dst, pmask, rt->rta_rtflags, wid.dst); 176 protrusion = p_sockaddr("gateway", rt->rta_gw, NULL, RTF_HOST, 177 wid.gw - protrusion); 178 snprintf(buffer, sizeof(buffer), "{[:-%d}{:flags/%%s}{]:} ", 179 wid.flags - protrusion); 180 p_flags(rt->rta_rtflags | RTF_UP, buffer); 181 /* Output path weight as non-visual property */ 182 xo_emit("{e:weight/%u}", rt->rtax_weight); 183 if (is_mpath) 184 xo_emit("{e:nhg-kidx/%u}", rt->rta_knh_id); 185 else 186 xo_emit("{e:nhop-kidx/%u}", rt->rta_knh_id); 187 if (rt->rta_nh_id != 0) { 188 if (is_mpath) 189 xo_emit("{e:nhg-uidx/%u}", rt->rta_nh_id); 190 else 191 xo_emit("{e:nhop-uidx/%u}", rt->rta_nh_id); 192 } 193 194 memset(prettyname, 0, sizeof(prettyname)); 195 if (rt->rta_oif < ifmap_size) { 196 strlcpy(prettyname, ifmap[rt->rta_oif].ifname, 197 sizeof(prettyname)); 198 if (*prettyname == '\0') 199 strlcpy(prettyname, "---", sizeof(prettyname)); 200 if (rt->rtax_mtu == 0) 201 rt->rtax_mtu = ifmap[rt->rta_oif].mtu; 202 } 203 204 if (Wflag) { 205 /* XXX: use=0? */ 206 xo_emit("{t:nhop/%*lu} ", wid.mtu, is_mpath ? 0 : rt->rta_knh_id); 207 208 if (rt->rtax_mtu != 0) 209 xo_emit("{t:mtu/%*lu} ", wid.mtu, rt->rtax_mtu); 210 else { 211 /* use interface mtu */ 212 xo_emit("{P:/%*s} ", wid.mtu, ""); 213 } 214 215 } 216 217 if (Wflag) 218 xo_emit("{t:interface-name/%*s}", wid.iface, prettyname); 219 else 220 xo_emit("{t:interface-name/%*.*s}", wid.iface, wid.iface, 221 prettyname); 222 if (rt->rta_expires > 0) { 223 xo_emit(" {:expire-time/%*u}", wid.expire, rt->rta_expires); 224 } 225 } 226 227 static void 228 p_rtentry_netlink(struct snl_state *ss, const char *name, struct nlmsghdr *hdr) 229 { 230 231 struct snl_parsed_route rt = {}; 232 if (!snl_parse_nlmsg(ss, hdr, &snl_rtm_route_parser, &rt)) 233 return; 234 if (rt.rtax_weight == 0) 235 rt.rtax_weight = rt_default_weight; 236 237 if (rt.rta_multipath.num_nhops != 0) { 238 uint32_t orig_rtflags = rt.rta_rtflags; 239 uint32_t orig_mtu = rt.rtax_mtu; 240 for (uint32_t i = 0; i < rt.rta_multipath.num_nhops; i++) { 241 struct rta_mpath_nh *nhop = rt.rta_multipath.nhops[i]; 242 243 rt.rta_gw = nhop->gw; 244 rt.rta_oif = nhop->ifindex; 245 rt.rtax_weight = nhop->rtnh_weight; 246 rt.rta_rtflags = nhop->rta_rtflags ? nhop->rta_rtflags : orig_rtflags; 247 rt.rtax_mtu = nhop->rtax_mtu ? nhop->rtax_mtu : orig_mtu; 248 249 xo_open_instance(name); 250 p_path(&rt, true); 251 xo_emit("\n"); 252 xo_close_instance(name); 253 } 254 return; 255 } 256 257 struct sockaddr_dl sdl_gw = { 258 .sdl_family = AF_LINK, 259 .sdl_len = sizeof(struct sockaddr_dl), 260 .sdl_index = rt.rta_oif, 261 }; 262 if (rt.rta_gw == NULL) 263 rt.rta_gw = (struct sockaddr *)&sdl_gw; 264 265 xo_open_instance(name); 266 p_path(&rt, false); 267 xo_emit("\n"); 268 xo_close_instance(name); 269 } 270 271 bool 272 p_rtable_netlink(int fibnum, int af) 273 { 274 int fam = AF_UNSPEC; 275 int need_table_close = false; 276 struct nlmsghdr *hdr; 277 struct snl_errmsg_data e = {}; 278 struct snl_state ss = {}; 279 280 if (!snl_init(&ss, NETLINK_ROUTE)) 281 return (false); 282 283 ifmap = prepare_ifmap_netlink(&ss, &ifmap_size); 284 if (ifmap == NULL) { 285 snl_free(&ss); 286 return (false); 287 } 288 289 struct { 290 struct nlmsghdr hdr; 291 struct rtmsg rtmsg; 292 struct nlattr nla_fibnum; 293 uint32_t fibnum; 294 } msg = { 295 .hdr.nlmsg_type = RTM_GETROUTE, 296 .hdr.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST, 297 .hdr.nlmsg_seq = snl_get_seq(&ss), 298 .rtmsg.rtm_family = af, 299 .nla_fibnum.nla_len = sizeof(struct nlattr) + sizeof(uint32_t), 300 .nla_fibnum.nla_type = RTA_TABLE, 301 .fibnum = fibnum, 302 }; 303 msg.hdr.nlmsg_len = sizeof(msg); 304 305 if (!snl_send_message(&ss, &msg.hdr)) { 306 snl_free(&ss); 307 return (false); 308 } 309 310 xo_open_container("route-table"); 311 xo_open_list("rt-family"); 312 while ((hdr = snl_read_reply_multi(&ss, msg.hdr.nlmsg_seq, &e)) != NULL) { 313 struct rtmsg *rtm = (struct rtmsg *)(hdr + 1); 314 /* Only print family first time. */ 315 if (fam != rtm->rtm_family) { 316 if (need_table_close) { 317 xo_close_list("rt-entry"); 318 xo_close_instance("rt-family"); 319 } 320 need_table_close = true; 321 fam = rtm->rtm_family; 322 set_wid(fam); 323 xo_open_instance("rt-family"); 324 pr_family(fam); 325 xo_open_list("rt-entry"); 326 pr_rthdr(fam); 327 } 328 p_rtentry_netlink(&ss, "rt-entry", hdr); 329 snl_clear_lb(&ss); 330 } 331 if (need_table_close) { 332 xo_close_list("rt-entry"); 333 xo_close_instance("rt-family"); 334 } 335 xo_close_list("rt-family"); 336 xo_close_container("route-table"); 337 snl_free(&ss); 338 return (true); 339 } 340 341 342