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 *
prepare_ifmap_netlink(struct snl_state * ss,size_t * pifmap_size)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
ip6_writemask(struct in6_addr * addr6,uint8_t mask)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
gen_mask(int family,int plen,struct sockaddr * sa)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
add_scopeid(struct sockaddr * sa,int ifindex)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
p_path(struct snl_parsed_route * rt,bool is_mpath)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
p_rtentry_netlink(struct snl_state * ss,const char * name,struct nlmsghdr * hdr)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
p_rtable_netlink(int fibnum,int af)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