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