1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2022 Alexander V. Chernikov <melifaro@FreeBSD.org>
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28 #include <stdio.h>
29 #include <stdlib.h>
30 #include <string.h>
31 #include <stdbool.h>
32 #include <err.h>
33 #include <errno.h>
34 #include <netdb.h>
35
36 #include <sys/bitcount.h>
37 #include <sys/param.h>
38 #include <sys/linker.h>
39 #include <sys/module.h>
40 #include <sys/socket.h>
41 #include <sys/sysctl.h>
42 #include <sys/time.h>
43 #include <sys/types.h>
44
45 #include <netinet/in.h>
46 #include <arpa/inet.h>
47
48 #include <net/ethernet.h>
49 #include <net/if.h>
50 #include <net/if_dl.h>
51 #include <net/if_strings.h>
52 #include <net/if_types.h>
53 #include "ifconfig.h"
54 #include "ifconfig_netlink.h"
55
56 static const char *IFFBITS[] = {
57 "UP", /* 00:0x1 IFF_UP*/
58 "BROADCAST", /* 01:0x2 IFF_BROADCAST*/
59 "DEBUG", /* 02:0x4 IFF_DEBUG*/
60 "LOOPBACK", /* 03:0x8 IFF_LOOPBACK*/
61 "POINTOPOINT", /* 04:0x10 IFF_POINTOPOINT*/
62 "NEEDSEPOCH", /* 05:0x20 IFF_NEEDSEPOCH*/
63 "RUNNING", /* 06:0x40 IFF_DRV_RUNNING*/
64 "NOARP", /* 07:0x80 IFF_NOARP*/
65 "PROMISC", /* 08:0x100 IFF_PROMISC*/
66 "ALLMULTI", /* 09:0x200 IFF_ALLMULTI*/
67 "DRV_OACTIVE", /* 10:0x400 IFF_DRV_OACTIVE*/
68 "SIMPLEX", /* 11:0x800 IFF_SIMPLEX*/
69 "LINK0", /* 12:0x1000 IFF_LINK0*/
70 "LINK1", /* 13:0x2000 IFF_LINK1*/
71 "LINK2", /* 14:0x4000 IFF_LINK2*/
72 "MULTICAST", /* 15:0x8000 IFF_MULTICAST*/
73 "CANTCONFIG", /* 16:0x10000 IFF_CANTCONFIG*/
74 "PPROMISC", /* 17:0x20000 IFF_PPROMISC*/
75 "MONITOR", /* 18:0x40000 IFF_MONITOR*/
76 "STATICARP", /* 19:0x80000 IFF_STATICARP*/
77 "STICKYARP", /* 20:0x100000 IFF_STICKYARP*/
78 "DYING", /* 21:0x200000 IFF_DYING*/
79 "RENAMING", /* 22:0x400000 IFF_RENAMING*/
80 "NOGROUP", /* 23:0x800000 IFF_NOGROUP*/
81 "LOWER_UP", /* 24:0x1000000 IFF_NETLINK_1*/
82 };
83
84 static void
nl_init_socket(struct snl_state * ss)85 nl_init_socket(struct snl_state *ss)
86 {
87 if (snl_init(ss, NETLINK_ROUTE))
88 return;
89
90 if (modfind("netlink") == -1 && errno == ENOENT) {
91 /* Try to load */
92 if (kldload("netlink") == -1)
93 err(1, "netlink is not loaded and load attempt failed");
94 if (snl_init(ss, NETLINK_ROUTE))
95 return;
96 }
97
98 err(1, "unable to open netlink socket");
99 }
100
101 int
ifconfig_nl(if_ctx * ctx,int iscreate,const struct afswtch * uafp)102 ifconfig_nl(if_ctx *ctx, int iscreate,
103 const struct afswtch *uafp)
104 {
105 struct snl_state ss = {};
106
107 nl_init_socket(&ss);
108 ctx->io_ss = &ss;
109
110 int error = ifconfig_ioctl(ctx, iscreate, uafp);
111
112 snl_free(&ss);
113 ctx->io_ss = NULL;
114
115 return (error);
116 }
117
118 struct ifa {
119 struct ifa *next;
120 uint32_t idx;
121 struct snl_parsed_addr addr;
122 };
123
124 struct iface {
125 struct snl_parsed_link link;
126 struct ifa *ifa;
127 uint32_t ifa_count;
128 uint32_t idx;
129 };
130
131 struct ifmap {
132 uint32_t size;
133 uint32_t count;
134 struct iface **ifaces;
135 };
136
137 /*
138 * Returns ifmap ifindex->snl_parsed_link.
139 * Memory is allocated using snl temporary buffers
140 */
141 static struct ifmap *
prepare_ifmap(struct snl_state * ss)142 prepare_ifmap(struct snl_state *ss)
143 {
144 struct snl_writer nw = {};
145
146 snl_init_writer(ss, &nw);
147 struct nlmsghdr *hdr = snl_create_msg_request(&nw, RTM_GETLINK);
148 hdr->nlmsg_flags |= NLM_F_DUMP;
149 snl_reserve_msg_object(&nw, struct ifinfomsg);
150
151 if (! (hdr = snl_finalize_msg(&nw)) || !snl_send_message(ss, hdr))
152 return (NULL);
153
154 uint32_t nlmsg_seq = hdr->nlmsg_seq;
155 struct ifmap *ifmap = snl_allocz(ss, sizeof(*ifmap));
156 struct snl_errmsg_data e = {};
157
158 while ((hdr = snl_read_reply_multi(ss, nlmsg_seq, &e)) != NULL) {
159 struct iface *iface = snl_allocz(ss, sizeof(*iface));
160
161 if (!snl_parse_nlmsg(ss, hdr, &snl_rtm_link_parser, &iface->link))
162 continue;
163 if (iface->link.ifi_index >= ifmap->size) {
164 size_t new_size = MAX(ifmap->size, 32);
165
166 while (new_size <= iface->link.ifi_index + 1)
167 new_size *= 2;
168
169 struct iface **ifaces= snl_allocz(ss, new_size * sizeof(void *));
170 memcpy(ifaces, ifmap->ifaces, ifmap->size * sizeof(void *));
171 ifmap->ifaces = ifaces;
172 ifmap->size = new_size;
173 }
174 ifmap->ifaces[iface->link.ifi_index] = iface;
175 ifmap->count++;
176 iface->idx = ifmap->count;
177 }
178 return (ifmap);
179 }
180
181 uint32_t
if_nametoindex_nl(struct snl_state * ss,const char * ifname)182 if_nametoindex_nl(struct snl_state *ss, const char *ifname)
183 {
184 struct snl_writer nw = {};
185 struct snl_parsed_link_simple link = {};
186
187 snl_init_writer(ss, &nw);
188 struct nlmsghdr *hdr = snl_create_msg_request(&nw, RTM_GETLINK);
189 snl_reserve_msg_object(&nw, struct ifinfomsg);
190 snl_add_msg_attr_string(&nw, IFLA_IFNAME, ifname);
191
192 if (! (hdr = snl_finalize_msg(&nw)) || !snl_send_message(ss, hdr))
193 return (0);
194
195 hdr = snl_read_reply(ss, hdr->nlmsg_seq);
196 if (hdr->nlmsg_type != NL_RTM_NEWLINK)
197 return (0);
198 if (!snl_parse_nlmsg(ss, hdr, &snl_rtm_link_parser_simple, &link))
199 return (0);
200
201 return (link.ifi_index);
202 }
203
204 ifType
convert_iftype(ifType iftype)205 convert_iftype(ifType iftype)
206 {
207 switch (iftype) {
208 case IFT_IEEE8023ADLAG:
209 return (IFT_ETHER);
210 case IFT_INFINIBANDLAG:
211 return (IFT_INFINIBAND);
212 default:
213 return (iftype);
214 }
215 }
216
217 static void
prepare_ifaddrs(struct snl_state * ss,struct ifmap * ifmap)218 prepare_ifaddrs(struct snl_state *ss, struct ifmap *ifmap)
219 {
220 struct snl_writer nw = {};
221
222 snl_init_writer(ss, &nw);
223 struct nlmsghdr *hdr = snl_create_msg_request(&nw, RTM_GETADDR);
224 hdr->nlmsg_flags |= NLM_F_DUMP;
225 snl_reserve_msg_object(&nw, struct ifaddrmsg);
226
227 if (! (hdr = snl_finalize_msg(&nw)) || !snl_send_message(ss, hdr))
228 return;
229
230 uint32_t nlmsg_seq = hdr->nlmsg_seq;
231 struct snl_errmsg_data e = {};
232 uint32_t count = 0;
233
234 while ((hdr = snl_read_reply_multi(ss, nlmsg_seq, &e)) != NULL) {
235 struct ifa *ifa = snl_allocz(ss, sizeof(*ifa));
236
237 if (!snl_parse_nlmsg(ss, hdr, &snl_rtm_addr_parser, &ifa->addr))
238 continue;
239
240 const uint32_t ifindex = ifa->addr.ifa_index;
241 if (ifindex >= ifmap->size || ifmap->ifaces[ifindex] == NULL)
242 continue;
243 struct iface *iface = ifmap->ifaces[ifindex];
244 ifa->next = iface->ifa;
245 ifa->idx = ++count;
246 iface->ifa = ifa;
247 iface->ifa_count++;
248 }
249 }
250
251 static bool
match_iface(struct ifconfig_args * args,struct iface * iface)252 match_iface(struct ifconfig_args *args, struct iface *iface)
253 {
254 if_link_t *link = &iface->link;
255
256 if (args->ifname != NULL && strcmp(args->ifname, link->ifla_ifname))
257 return (false);
258
259 if (!match_if_flags(args, link->ifi_flags))
260 return (false);
261
262 if (!group_member(link->ifla_ifname, args->matchgroup, args->nogroup))
263 return (false);
264
265 if (args->afp == NULL)
266 return (true);
267
268 if (!strcmp(args->afp->af_name, "ether")) {
269 if (link->ifla_address == NULL)
270 return (false);
271
272 struct sockaddr_dl sdl = {
273 .sdl_len = sizeof(struct sockaddr_dl),
274 .sdl_family = AF_LINK,
275 .sdl_type = convert_iftype(link->ifi_type),
276 .sdl_alen = NLA_DATA_LEN(link->ifla_address),
277 };
278 return (match_ether(&sdl));
279 } else if (args->afp->af_af == AF_LINK)
280 /*
281 * The rtnetlink(4) RTM_GETADDR does not list link level
282 * addresses, so latter cycle won't match anything. Short
283 * circuit on RTM_GETLINK has provided us an address.
284 */
285 return (link->ifla_address != NULL);
286
287 for (struct ifa *ifa = iface->ifa; ifa != NULL; ifa = ifa->next) {
288 if (args->afp->af_af == ifa->addr.ifa_family)
289 return (true);
290 }
291
292 return (false);
293 }
294
295 /* Sort according to the kernel-provided order */
296 static int
cmp_iface(const void * _a,const void * _b)297 cmp_iface(const void *_a, const void *_b)
298 {
299 const struct iface *a = *((const void * const *)_a);
300 const struct iface *b = *((const void * const *)_b);
301
302 return ((a->idx > b->idx) * 2 - 1);
303 }
304
305 static int
cmp_ifaddr(const void * _a,const void * _b)306 cmp_ifaddr(const void *_a, const void *_b)
307 {
308 const struct ifa *a = *((const void * const *)_a);
309 const struct ifa *b = *((const void * const *)_b);
310
311 if (a->addr.ifa_family != b->addr.ifa_family)
312 return ((a->addr.ifa_family > b->addr.ifa_family) * 2 - 1);
313 return ((a->idx > b->idx) * 2 - 1);
314 }
315
316 static void
sort_iface_ifaddrs(struct snl_state * ss,struct iface * iface)317 sort_iface_ifaddrs(struct snl_state *ss, struct iface *iface)
318 {
319 if (iface->ifa_count == 0)
320 return;
321
322 struct ifa **sorted_ifaddrs = snl_allocz(ss, iface->ifa_count * sizeof(void *));
323 struct ifa *ifa = iface->ifa;
324
325 for (uint32_t i = 0; i < iface->ifa_count; i++) {
326 struct ifa *ifa_next = ifa->next;
327
328 sorted_ifaddrs[i] = ifa;
329 ifa->next = NULL;
330 ifa = ifa_next;
331 }
332 qsort(sorted_ifaddrs, iface->ifa_count, sizeof(void *), cmp_ifaddr);
333 ifa = sorted_ifaddrs[0];
334 iface->ifa = ifa;
335 for (uint32_t i = 1; i < iface->ifa_count; i++) {
336 ifa->next = sorted_ifaddrs[i];
337 ifa = sorted_ifaddrs[i];
338 }
339 }
340
341 static void
print_ifcaps(if_ctx * ctx,if_link_t * link)342 print_ifcaps(if_ctx *ctx, if_link_t *link)
343 {
344 uint32_t sz_u32 = roundup2(link->iflaf_caps.nla_bitset_size, 32) / 32;
345
346 if (sz_u32 > 0) {
347 uint32_t *caps = link->iflaf_caps.nla_bitset_value;
348
349 printf("\toptions=%x", caps[0]);
350 print_bits("IFCAPS", caps, sz_u32, ifcap_bit_names, nitems(ifcap_bit_names));
351 putchar('\n');
352 }
353
354 if (ctx->args->supmedia && sz_u32 > 0) {
355 uint32_t *caps = link->iflaf_caps.nla_bitset_mask;
356
357 printf("\tcapabilities=%x", caps[0]);
358 print_bits("IFCAPS", caps, sz_u32, ifcap_bit_names, nitems(ifcap_bit_names));
359 putchar('\n');
360 }
361 }
362
363 static void
status_nl(if_ctx * ctx,struct iface * iface)364 status_nl(if_ctx *ctx, struct iface *iface)
365 {
366 if_link_t *link = &iface->link;
367 struct ifconfig_args *args = ctx->args;
368 char *drivername = NULL;
369
370 printf("%s: ", link->ifla_ifname);
371
372 printf("flags=%x", link->ifi_flags);
373 print_bits("IFF", &link->ifi_flags, 1, IFFBITS, nitems(IFFBITS));
374
375 print_metric(ctx);
376 printf(" mtu %d\n", link->ifla_mtu);
377
378 if (link->ifla_ifalias != NULL)
379 printf("\tdescription: %s\n", link->ifla_ifalias);
380
381 print_ifcaps(ctx, link);
382 tunnel_status(ctx);
383
384 if (args->allfamilies | (args->afp != NULL && args->afp->af_af == AF_LINK)) {
385 /* Start with link-level */
386 const struct afswtch *p = af_getbyfamily(AF_LINK);
387 if (p != NULL && link->ifla_address != NULL)
388 p->af_status(ctx, link, NULL);
389 }
390
391 sort_iface_ifaddrs(ctx->io_ss, iface);
392
393 for (struct ifa *ifa = iface->ifa; ifa != NULL; ifa = ifa->next) {
394 if (args->allfamilies) {
395 const struct afswtch *p = af_getbyfamily(ifa->addr.ifa_family);
396
397 if (p != NULL)
398 p->af_status(ctx, link, &ifa->addr);
399 } else if (args->afp->af_af == ifa->addr.ifa_family) {
400 const struct afswtch *p = args->afp;
401
402 p->af_status(ctx, link, &ifa->addr);
403 }
404 }
405
406 /* TODO: convert to netlink */
407 if (args->allfamilies)
408 af_other_status(ctx);
409 else if (args->afp->af_other_status != NULL)
410 args->afp->af_other_status(ctx);
411
412 print_ifstatus(ctx);
413 if (args->drivername || args->verbose) {
414 if (ifconfig_get_orig_name(lifh, link->ifla_ifname,
415 &drivername) != 0) {
416 if (ifconfig_err_errtype(lifh) == OTHER)
417 fprintf(stderr, "get original name: %s\n",
418 strerror(ifconfig_err_errno(lifh)));
419 else
420 fprintf(stderr,
421 "get original name: error type %d\n",
422 ifconfig_err_errtype(lifh));
423 exit_code = 1;
424 }
425 if (drivername != NULL)
426 printf("\tdrivername: %s\n", drivername);
427 free(drivername);
428 }
429 if (args->verbose > 0)
430 sfp_status(ctx);
431 }
432
433 static int
get_local_socket(void)434 get_local_socket(void)
435 {
436 int s = socket(AF_LOCAL, SOCK_DGRAM, 0);
437
438 if (s < 0)
439 err(1, "socket(family %u,SOCK_DGRAM)", AF_LOCAL);
440 return (s);
441 }
442
443 void
list_interfaces_nl(struct ifconfig_args * args)444 list_interfaces_nl(struct ifconfig_args *args)
445 {
446 struct snl_state ss = {};
447 struct ifconfig_context _ctx = {
448 .args = args,
449 .io_s = get_local_socket(),
450 .io_ss = &ss,
451 };
452 struct ifconfig_context *ctx = &_ctx;
453
454 nl_init_socket(&ss);
455
456 struct ifmap *ifmap = prepare_ifmap(&ss);
457 struct iface **sorted_ifaces = snl_allocz(&ss, ifmap->count * sizeof(void *));
458 for (uint32_t i = 0, num = 0; i < ifmap->size; i++) {
459 if (ifmap->ifaces[i] != NULL) {
460 sorted_ifaces[num++] = ifmap->ifaces[i];
461 if (num == ifmap->count)
462 break;
463 }
464 }
465 qsort(sorted_ifaces, ifmap->count, sizeof(void *), cmp_iface);
466 prepare_ifaddrs(&ss, ifmap);
467
468 for (uint32_t i = 0, num = 0; i < ifmap->count; i++) {
469 struct iface *iface = sorted_ifaces[i];
470
471 if (!match_iface(args, iface))
472 continue;
473
474 ctx->ifname = iface->link.ifla_ifname;
475
476 if (args->namesonly) {
477 if (num++ != 0)
478 printf(" ");
479 fputs(iface->link.ifla_ifname, stdout);
480 } else if (args->argc == 0)
481 status_nl(ctx, iface);
482 else
483 ifconfig_ioctl(ctx, 0, args->afp);
484 }
485 if (args->namesonly)
486 printf("\n");
487
488 close(ctx->io_s);
489 snl_free(&ss);
490 }
491
492