1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995
5 * The Regents of the University of California.
6 * Copyright (c) 2008 Robert N. M. Watson
7 * Copyright (c) 2010-2011 Juniper Networks, Inc.
8 * Copyright (c) 2014 Kevin Lo
9 * All rights reserved.
10 *
11 * Portions of this software were developed by Robert N. M. Watson under
12 * contract to Juniper Networks, Inc.
13 *
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions
16 * are met:
17 * 1. Redistributions of source code must retain the above copyright
18 * notice, this list of conditions and the following disclaimer.
19 * 2. Redistributions in binary form must reproduce the above copyright
20 * notice, this list of conditions and the following disclaimer in the
21 * documentation and/or other materials provided with the distribution.
22 * 3. Neither the name of the University nor the names of its contributors
23 * may be used to endorse or promote products derived from this software
24 * without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * SUCH DAMAGE.
37 */
38
39 #include "opt_inet.h"
40 #include "opt_inet6.h"
41 #include "opt_ipsec.h"
42 #include "opt_rss.h"
43
44 #include <sys/param.h>
45 #include <sys/domain.h>
46 #include <sys/eventhandler.h>
47 #include <sys/jail.h>
48 #include <sys/kernel.h>
49 #include <sys/lock.h>
50 #include <sys/malloc.h>
51 #include <sys/mbuf.h>
52 #include <sys/priv.h>
53 #include <sys/proc.h>
54 #include <sys/protosw.h>
55 #include <sys/sdt.h>
56 #include <sys/signalvar.h>
57 #include <sys/socket.h>
58 #include <sys/socketvar.h>
59 #include <sys/sx.h>
60 #include <sys/sysctl.h>
61 #include <sys/syslog.h>
62 #include <sys/systm.h>
63
64 #include <vm/uma.h>
65
66 #include <net/if.h>
67 #include <net/if_var.h>
68 #include <net/route.h>
69 #include <net/route/nhop.h>
70 #include <net/rss_config.h>
71
72 #include <netinet/in.h>
73 #include <netinet/in_kdtrace.h>
74 #include <netinet/in_fib.h>
75 #include <netinet/in_pcb.h>
76 #include <netinet/in_systm.h>
77 #include <netinet/in_var.h>
78 #include <netinet/ip.h>
79 #ifdef INET6
80 #include <netinet/ip6.h>
81 #endif
82 #include <netinet/ip_icmp.h>
83 #include <netinet/icmp_var.h>
84 #include <netinet/ip_var.h>
85 #include <netinet/ip_options.h>
86 #ifdef INET6
87 #include <netinet6/ip6_var.h>
88 #endif
89 #include <netinet/udp.h>
90 #include <netinet/udp_var.h>
91 #include <netinet/udplite.h>
92 #include <netinet/in_rss.h>
93
94 #include <netipsec/ipsec_support.h>
95
96 #include <machine/in_cksum.h>
97
98 #include <security/mac/mac_framework.h>
99
100 /*
101 * UDP and UDP-Lite protocols implementation.
102 * Per RFC 768, August, 1980.
103 * Per RFC 3828, July, 2004.
104 */
105
106 VNET_DEFINE(int, udp_bind_all_fibs) = 1;
107 SYSCTL_INT(_net_inet_udp, OID_AUTO, bind_all_fibs, CTLFLAG_VNET | CTLFLAG_RDTUN,
108 &VNET_NAME(udp_bind_all_fibs), 0,
109 "Bound sockets receive traffic from all FIBs");
110
111 /*
112 * BSD 4.2 defaulted the udp checksum to be off. Turning off udp checksums
113 * removes the only data integrity mechanism for packets and malformed
114 * packets that would otherwise be discarded due to bad checksums, and may
115 * cause problems (especially for NFS data blocks).
116 */
117 VNET_DEFINE(int, udp_cksum) = 1;
118 SYSCTL_INT(_net_inet_udp, UDPCTL_CHECKSUM, checksum, CTLFLAG_VNET | CTLFLAG_RW,
119 &VNET_NAME(udp_cksum), 0, "compute udp checksum");
120
121 VNET_DEFINE(int, udp_log_in_vain) = 0;
122 SYSCTL_INT(_net_inet_udp, OID_AUTO, log_in_vain, CTLFLAG_VNET | CTLFLAG_RW,
123 &VNET_NAME(udp_log_in_vain), 0, "Log all incoming UDP packets");
124
125 VNET_DEFINE(int, udp_blackhole) = 0;
126 SYSCTL_INT(_net_inet_udp, OID_AUTO, blackhole, CTLFLAG_VNET | CTLFLAG_RW,
127 &VNET_NAME(udp_blackhole), 0,
128 "Do not send port unreachables for refused connects");
129 VNET_DEFINE(bool, udp_blackhole_local) = false;
130 SYSCTL_BOOL(_net_inet_udp, OID_AUTO, blackhole_local, CTLFLAG_VNET |
131 CTLFLAG_RW, &VNET_NAME(udp_blackhole_local), false,
132 "Enforce net.inet.udp.blackhole for locally originated packets");
133
134 u_long udp_sendspace = 9216; /* really max datagram size */
135 SYSCTL_ULONG(_net_inet_udp, UDPCTL_MAXDGRAM, maxdgram, CTLFLAG_RW,
136 &udp_sendspace, 0, "Maximum outgoing UDP datagram size");
137
138 u_long udp_recvspace = 40 * (1024 +
139 #ifdef INET6
140 sizeof(struct sockaddr_in6)
141 #else
142 sizeof(struct sockaddr_in)
143 #endif
144 ); /* 40 1K datagrams */
145
146 SYSCTL_ULONG(_net_inet_udp, UDPCTL_RECVSPACE, recvspace, CTLFLAG_RW,
147 &udp_recvspace, 0, "Maximum space for incoming UDP datagrams");
148
149 VNET_DEFINE(struct inpcbinfo, udbinfo);
150 VNET_DEFINE(struct inpcbinfo, ulitecbinfo);
151
152 #ifndef UDBHASHSIZE
153 #define UDBHASHSIZE 128
154 #endif
155
156 VNET_PCPUSTAT_DEFINE(struct udpstat, udpstat); /* from udp_var.h */
157 VNET_PCPUSTAT_SYSINIT(udpstat);
158 SYSCTL_VNET_PCPUSTAT(_net_inet_udp, UDPCTL_STATS, stats, struct udpstat,
159 udpstat, "UDP statistics (struct udpstat, netinet/udp_var.h)");
160
161 #ifdef VIMAGE
162 VNET_PCPUSTAT_SYSUNINIT(udpstat);
163 #endif /* VIMAGE */
164 #ifdef INET
165 static void udp_detach(struct socket *so);
166 #endif
167
168 INPCBSTORAGE_DEFINE(udpcbstor, udpcb, "udpinp", "udp_inpcb", "udp", "udphash");
169 INPCBSTORAGE_DEFINE(udplitecbstor, udpcb, "udpliteinp", "udplite_inpcb",
170 "udplite", "udplitehash");
171
172 static void
udp_vnet_init(void * arg __unused)173 udp_vnet_init(void *arg __unused)
174 {
175
176 /*
177 * For now default to 2-tuple UDP hashing - until the fragment
178 * reassembly code can also update the flowid.
179 *
180 * Once we can calculate the flowid that way and re-establish
181 * a 4-tuple, flip this to 4-tuple.
182 */
183 in_pcbinfo_init(&V_udbinfo, &udpcbstor, UDBHASHSIZE, UDBHASHSIZE);
184 /* Additional pcbinfo for UDP-Lite */
185 in_pcbinfo_init(&V_ulitecbinfo, &udplitecbstor, UDBHASHSIZE,
186 UDBHASHSIZE);
187 }
188 VNET_SYSINIT(udp_vnet_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_FOURTH,
189 udp_vnet_init, NULL);
190
191 /*
192 * Kernel module interface for updating udpstat. The argument is an index
193 * into udpstat treated as an array of u_long. While this encodes the
194 * general layout of udpstat into the caller, it doesn't encode its location,
195 * so that future changes to add, for example, per-CPU stats support won't
196 * cause binary compatibility problems for kernel modules.
197 */
198 void
kmod_udpstat_inc(int statnum)199 kmod_udpstat_inc(int statnum)
200 {
201
202 counter_u64_add(VNET(udpstat)[statnum], 1);
203 }
204
205 #ifdef VIMAGE
206 static void
udp_destroy(void * unused __unused)207 udp_destroy(void *unused __unused)
208 {
209
210 in_pcbinfo_destroy(&V_udbinfo);
211 in_pcbinfo_destroy(&V_ulitecbinfo);
212 }
213 VNET_SYSUNINIT(udp, SI_SUB_PROTO_DOMAIN, SI_ORDER_FOURTH, udp_destroy, NULL);
214 #endif
215
216 #ifdef INET
217 /*
218 * Subroutine of udp_input(), which appends the provided mbuf chain to the
219 * passed pcb/socket. The caller must provide a sockaddr_in via udp_in that
220 * contains the source address. If the socket ends up being an IPv6 socket,
221 * udp_append() will convert to a sockaddr_in6 before passing the address
222 * into the socket code.
223 *
224 * In the normal case udp_append() will return 'false', indicating that you
225 * must unlock the inpcb. However if a tunneling protocol is in place we
226 * increment the inpcb refcnt and unlock the inpcb, on return from the tunneling
227 * protocol we then decrement the reference count. If in_pcbrele_rlocked()
228 * returns 'true', indicating the inpcb is gone, we return that to the caller
229 * to tell them *not* to unlock the inpcb. In the case of multicast this will
230 * cause the distribution to stop (though most tunneling protocols known
231 * currently do *not* use multicast).
232 *
233 * The mbuf is always consumed.
234 */
235 static bool
udp_append(struct inpcb * inp,struct ip * ip,struct mbuf * n,int off,struct sockaddr_in * udp_in)236 udp_append(struct inpcb *inp, struct ip *ip, struct mbuf *n, int off,
237 struct sockaddr_in *udp_in)
238 {
239 struct sockaddr *append_sa;
240 struct socket *so;
241 struct mbuf *tmpopts, *opts = NULL;
242 #ifdef INET6
243 struct sockaddr_in6 udp_in6;
244 #endif
245 struct udpcb *up;
246
247 INP_LOCK_ASSERT(inp);
248
249 /*
250 * Engage the tunneling protocol.
251 */
252 up = intoudpcb(inp);
253 if (up->u_tun_func != NULL) {
254 bool filtered;
255
256 in_pcbref(inp);
257 INP_RUNLOCK(inp);
258 filtered = (*up->u_tun_func)(n, off, inp,
259 (struct sockaddr *)&udp_in[0], up->u_tun_ctx);
260 INP_RLOCK(inp);
261 if (in_pcbrele_rlocked(inp)) {
262 if (!filtered)
263 m_freem(n);
264 return (true);
265 }
266 if (filtered)
267 return (false);
268 }
269
270 off += sizeof(struct udphdr);
271
272 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
273 /* Check AH/ESP integrity. */
274 if (IPSEC_ENABLED(ipv4) &&
275 IPSEC_CHECK_POLICY(ipv4, n, inp) != 0) {
276 m_freem(n);
277 return (false);
278 }
279 if (up->u_flags & UF_ESPINUDP) {/* IPSec UDP encaps. */
280 if (IPSEC_ENABLED(ipv4) &&
281 UDPENCAP_INPUT(ipv4, n, off, AF_INET) != 0)
282 return (false);
283 }
284 #endif /* IPSEC */
285 #ifdef MAC
286 if (mac_inpcb_check_deliver(inp, n) != 0) {
287 m_freem(n);
288 return (false);
289 }
290 #endif /* MAC */
291 if (inp->inp_flags & INP_CONTROLOPTS ||
292 inp->inp_socket->so_options & (SO_TIMESTAMP | SO_BINTIME)) {
293 #ifdef INET6
294 if (inp->inp_vflag & INP_IPV6)
295 (void)ip6_savecontrol_v4(inp, n, &opts, NULL);
296 else
297 #endif /* INET6 */
298 ip_savecontrol(inp, &opts, ip, n);
299 }
300 if ((inp->inp_vflag & INP_IPV4) && (inp->inp_flags2 & INP_ORIGDSTADDR)) {
301 tmpopts = sbcreatecontrol(&udp_in[1],
302 sizeof(struct sockaddr_in), IP_ORIGDSTADDR, IPPROTO_IP,
303 M_NOWAIT);
304 if (tmpopts) {
305 if (opts) {
306 tmpopts->m_next = opts;
307 opts = tmpopts;
308 } else
309 opts = tmpopts;
310 }
311 }
312 #ifdef INET6
313 if (inp->inp_vflag & INP_IPV6) {
314 bzero(&udp_in6, sizeof(udp_in6));
315 udp_in6.sin6_len = sizeof(udp_in6);
316 udp_in6.sin6_family = AF_INET6;
317 in6_sin_2_v4mapsin6(&udp_in[0], &udp_in6);
318 append_sa = (struct sockaddr *)&udp_in6;
319 } else
320 #endif /* INET6 */
321 append_sa = (struct sockaddr *)&udp_in[0];
322 m_adj(n, off);
323
324 so = inp->inp_socket;
325 SOCKBUF_LOCK(&so->so_rcv);
326 if (sbappendaddr_locked(&so->so_rcv, append_sa, n, opts) == 0) {
327 soroverflow_locked(so);
328 m_freem(n);
329 if (opts)
330 m_freem(opts);
331 UDPSTAT_INC(udps_fullsock);
332 } else
333 sorwakeup_locked(so);
334 return (false);
335 }
336
337 static bool
udp_multi_match(const struct inpcb * inp,void * v)338 udp_multi_match(const struct inpcb *inp, void *v)
339 {
340 struct ip *ip = v;
341 struct udphdr *uh = (struct udphdr *)(ip + 1);
342
343 if (inp->inp_lport != uh->uh_dport)
344 return (false);
345 #ifdef INET6
346 if ((inp->inp_vflag & INP_IPV4) == 0)
347 return (false);
348 #endif
349 if (inp->inp_laddr.s_addr != INADDR_ANY &&
350 inp->inp_laddr.s_addr != ip->ip_dst.s_addr)
351 return (false);
352 if (inp->inp_faddr.s_addr != INADDR_ANY &&
353 inp->inp_faddr.s_addr != ip->ip_src.s_addr)
354 return (false);
355 if (inp->inp_fport != 0 &&
356 inp->inp_fport != uh->uh_sport)
357 return (false);
358
359 return (true);
360 }
361
362 static int
udp_multi_input(struct mbuf * m,int proto,struct sockaddr_in * udp_in)363 udp_multi_input(struct mbuf *m, int proto, struct sockaddr_in *udp_in)
364 {
365 struct ip *ip = mtod(m, struct ip *);
366 struct inpcb_iterator inpi = INP_ITERATOR(udp_get_inpcbinfo(proto),
367 INPLOOKUP_RLOCKPCB, udp_multi_match, ip);
368 #ifdef KDTRACE_HOOKS
369 struct udphdr *uh = (struct udphdr *)(ip + 1);
370 #endif
371 struct inpcb *inp;
372 struct mbuf *n;
373 int appends = 0, fib;
374
375 MPASS(ip->ip_hl == sizeof(struct ip) >> 2);
376
377 fib = M_GETFIB(m);
378
379 while ((inp = inp_next(&inpi)) != NULL) {
380 /*
381 * XXXRW: Because we weren't holding either the inpcb
382 * or the hash lock when we checked for a match
383 * before, we should probably recheck now that the
384 * inpcb lock is held.
385 */
386
387 if (V_udp_bind_all_fibs == 0 && fib != inp->inp_inc.inc_fibnum)
388 /*
389 * Sockets bound to a specific FIB can only receive
390 * packets from that FIB.
391 */
392 continue;
393
394 /*
395 * Handle socket delivery policy for any-source
396 * and source-specific multicast. [RFC3678]
397 */
398 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
399 struct ip_moptions *imo;
400 struct sockaddr_in group;
401 int blocked;
402
403 imo = inp->inp_moptions;
404 if (imo == NULL)
405 continue;
406 bzero(&group, sizeof(struct sockaddr_in));
407 group.sin_len = sizeof(struct sockaddr_in);
408 group.sin_family = AF_INET;
409 group.sin_addr = ip->ip_dst;
410
411 blocked = imo_multi_filter(imo, m->m_pkthdr.rcvif,
412 (struct sockaddr *)&group,
413 (struct sockaddr *)&udp_in[0]);
414 if (blocked != MCAST_PASS) {
415 if (blocked == MCAST_NOTGMEMBER)
416 IPSTAT_INC(ips_notmember);
417 if (blocked == MCAST_NOTSMEMBER ||
418 blocked == MCAST_MUTED)
419 UDPSTAT_INC(udps_filtermcast);
420 continue;
421 }
422 }
423 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) != NULL) {
424 if (proto == IPPROTO_UDPLITE)
425 UDPLITE_PROBE(receive, NULL, inp, ip, inp, uh);
426 else
427 UDP_PROBE(receive, NULL, inp, ip, inp, uh);
428 if (udp_append(inp, ip, n, sizeof(struct ip), udp_in)) {
429 break;
430 } else
431 appends++;
432 }
433 /*
434 * Don't look for additional matches if this one does
435 * not have either the SO_REUSEPORT or SO_REUSEADDR
436 * socket options set. This heuristic avoids
437 * searching through all pcbs in the common case of a
438 * non-shared port. It assumes that an application
439 * will never clear these options after setting them.
440 */
441 if ((inp->inp_socket->so_options &
442 (SO_REUSEPORT|SO_REUSEPORT_LB|SO_REUSEADDR)) == 0) {
443 INP_RUNLOCK(inp);
444 break;
445 }
446 }
447
448 if (appends == 0) {
449 /*
450 * No matching pcb found; discard datagram. (No need
451 * to send an ICMP Port Unreachable for a broadcast
452 * or multicast datagram.)
453 */
454 UDPSTAT_INC(udps_noport);
455 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)))
456 UDPSTAT_INC(udps_noportmcast);
457 else
458 UDPSTAT_INC(udps_noportbcast);
459 }
460 m_freem(m);
461
462 return (IPPROTO_DONE);
463 }
464
465 static int
udp_input(struct mbuf ** mp,int * offp,int proto)466 udp_input(struct mbuf **mp, int *offp, int proto)
467 {
468 struct ip *ip;
469 struct udphdr *uh;
470 struct ifnet *ifp;
471 struct inpcb *inp;
472 uint16_t len, ip_len;
473 struct inpcbinfo *pcbinfo;
474 struct sockaddr_in udp_in[2];
475 struct mbuf *m;
476 struct m_tag *fwd_tag;
477 int cscov_partial, iphlen, lookupflags;
478
479 m = *mp;
480 iphlen = *offp;
481 ifp = m->m_pkthdr.rcvif;
482 *mp = NULL;
483 UDPSTAT_INC(udps_ipackets);
484
485 /*
486 * Strip IP options, if any; should skip this, make available to
487 * user, and use on returned packets, but we don't yet have a way to
488 * check the checksum with options still present.
489 */
490 if (iphlen > sizeof (struct ip)) {
491 ip_stripoptions(m);
492 iphlen = sizeof(struct ip);
493 }
494
495 /*
496 * Get IP and UDP header together in first mbuf.
497 */
498 if (m->m_len < iphlen + sizeof(struct udphdr)) {
499 if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == NULL) {
500 UDPSTAT_INC(udps_hdrops);
501 return (IPPROTO_DONE);
502 }
503 }
504 ip = mtod(m, struct ip *);
505 uh = (struct udphdr *)((caddr_t)ip + iphlen);
506 cscov_partial = (proto == IPPROTO_UDPLITE) ? 1 : 0;
507
508 /*
509 * Destination port of 0 is illegal, based on RFC768.
510 */
511 if (uh->uh_dport == 0)
512 goto badunlocked;
513
514 /*
515 * Construct sockaddr format source address. Stuff source address
516 * and datagram in user buffer.
517 */
518 bzero(&udp_in[0], sizeof(struct sockaddr_in) * 2);
519 udp_in[0].sin_len = sizeof(struct sockaddr_in);
520 udp_in[0].sin_family = AF_INET;
521 udp_in[0].sin_port = uh->uh_sport;
522 udp_in[0].sin_addr = ip->ip_src;
523 udp_in[1].sin_len = sizeof(struct sockaddr_in);
524 udp_in[1].sin_family = AF_INET;
525 udp_in[1].sin_port = uh->uh_dport;
526 udp_in[1].sin_addr = ip->ip_dst;
527
528 /*
529 * Make mbuf data length reflect UDP length. If not enough data to
530 * reflect UDP length, drop.
531 */
532 len = ntohs((u_short)uh->uh_ulen);
533 ip_len = ntohs(ip->ip_len) - iphlen;
534 if (proto == IPPROTO_UDPLITE && (len == 0 || len == ip_len)) {
535 /* Zero means checksum over the complete packet. */
536 if (len == 0)
537 len = ip_len;
538 cscov_partial = 0;
539 }
540 if (ip_len != len) {
541 if (len > ip_len || len < sizeof(struct udphdr)) {
542 UDPSTAT_INC(udps_badlen);
543 goto badunlocked;
544 }
545 if (proto == IPPROTO_UDP)
546 m_adj(m, len - ip_len);
547 }
548
549 /*
550 * Checksum extended UDP header and data.
551 */
552 if (uh->uh_sum) {
553 u_short uh_sum;
554
555 if ((m->m_pkthdr.csum_flags & CSUM_DATA_VALID) &&
556 !cscov_partial) {
557 if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR)
558 uh_sum = m->m_pkthdr.csum_data;
559 else
560 uh_sum = in_pseudo(ip->ip_src.s_addr,
561 ip->ip_dst.s_addr, htonl((u_short)len +
562 m->m_pkthdr.csum_data + proto));
563 uh_sum ^= 0xffff;
564 } else if (m->m_pkthdr.csum_flags & CSUM_IP_UDP) {
565 /*
566 * Packet from local host (maybe from a VM).
567 * Checksum not required.
568 */
569 uh_sum = 0;
570 } else {
571 char b[offsetof(struct ipovly, ih_src)];
572 struct ipovly *ipov = (struct ipovly *)ip;
573
574 memcpy(b, ipov, sizeof(b));
575 bzero(ipov, sizeof(ipov->ih_x1));
576 ipov->ih_len = (proto == IPPROTO_UDP) ?
577 uh->uh_ulen : htons(ip_len);
578 uh_sum = in_cksum(m, len + sizeof (struct ip));
579 memcpy(ipov, b, sizeof(b));
580 }
581 if (uh_sum) {
582 UDPSTAT_INC(udps_badsum);
583 m_freem(m);
584 return (IPPROTO_DONE);
585 }
586 } else {
587 if (proto == IPPROTO_UDP) {
588 UDPSTAT_INC(udps_nosum);
589 } else {
590 /* UDPLite requires a checksum */
591 /* XXX: What is the right UDPLite MIB counter here? */
592 m_freem(m);
593 return (IPPROTO_DONE);
594 }
595 }
596
597 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) ||
598 in_ifnet_broadcast(ip->ip_dst, ifp))
599 return (udp_multi_input(m, proto, udp_in));
600
601 pcbinfo = udp_get_inpcbinfo(proto);
602
603 /*
604 * Locate pcb for datagram.
605 */
606 lookupflags = INPLOOKUP_RLOCKPCB |
607 (V_udp_bind_all_fibs ? 0 : INPLOOKUP_FIB);
608
609 /*
610 * Grab info from PACKET_TAG_IPFORWARD tag prepended to the chain.
611 */
612 if ((m->m_flags & M_IP_NEXTHOP) &&
613 (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) {
614 struct sockaddr_in *next_hop;
615
616 next_hop = (struct sockaddr_in *)(fwd_tag + 1);
617
618 /*
619 * Transparently forwarded. Pretend to be the destination.
620 * Already got one like this?
621 */
622 inp = in_pcblookup_mbuf(pcbinfo, ip->ip_src, uh->uh_sport,
623 ip->ip_dst, uh->uh_dport, lookupflags, ifp, m);
624 if (!inp) {
625 /*
626 * It's new. Try to find the ambushing socket.
627 * Because we've rewritten the destination address,
628 * any hardware-generated hash is ignored.
629 */
630 inp = in_pcblookup(pcbinfo, ip->ip_src,
631 uh->uh_sport, next_hop->sin_addr,
632 next_hop->sin_port ? htons(next_hop->sin_port) :
633 uh->uh_dport, INPLOOKUP_WILDCARD | lookupflags,
634 ifp);
635 }
636 /* Remove the tag from the packet. We don't need it anymore. */
637 m_tag_delete(m, fwd_tag);
638 m->m_flags &= ~M_IP_NEXTHOP;
639 } else
640 inp = in_pcblookup_mbuf(pcbinfo, ip->ip_src, uh->uh_sport,
641 ip->ip_dst, uh->uh_dport, INPLOOKUP_WILDCARD |
642 lookupflags, ifp, m);
643 if (inp == NULL) {
644 if (V_udp_log_in_vain) {
645 char src[INET_ADDRSTRLEN];
646 char dst[INET_ADDRSTRLEN];
647
648 log(LOG_INFO,
649 "Connection attempt to UDP %s:%d from %s:%d\n",
650 inet_ntoa_r(ip->ip_dst, dst), ntohs(uh->uh_dport),
651 inet_ntoa_r(ip->ip_src, src), ntohs(uh->uh_sport));
652 }
653 if (proto == IPPROTO_UDPLITE)
654 UDPLITE_PROBE(receive, NULL, NULL, ip, NULL, uh);
655 else
656 UDP_PROBE(receive, NULL, NULL, ip, NULL, uh);
657 UDPSTAT_INC(udps_noport);
658 if (m->m_flags & M_MCAST) {
659 UDPSTAT_INC(udps_noportmcast);
660 goto badunlocked;
661 }
662 if (m->m_flags & M_BCAST) {
663 UDPSTAT_INC(udps_noportbcast);
664 goto badunlocked;
665 }
666 if (V_udp_blackhole && (V_udp_blackhole_local ||
667 !in_localip(ip->ip_src)))
668 goto badunlocked;
669 if (badport_bandlim(BANDLIM_ICMP_UNREACH) < 0)
670 goto badunlocked;
671 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
672 return (IPPROTO_DONE);
673 }
674
675 /*
676 * Check the minimum TTL for socket.
677 */
678 INP_RLOCK_ASSERT(inp);
679 if (inp->inp_ip_minttl && inp->inp_ip_minttl > ip->ip_ttl) {
680 if (proto == IPPROTO_UDPLITE)
681 UDPLITE_PROBE(receive, NULL, inp, ip, inp, uh);
682 else
683 UDP_PROBE(receive, NULL, inp, ip, inp, uh);
684 INP_RUNLOCK(inp);
685 m_freem(m);
686 return (IPPROTO_DONE);
687 }
688 if (cscov_partial) {
689 struct udpcb *up;
690
691 up = intoudpcb(inp);
692 if (up->u_rxcslen == 0 || up->u_rxcslen > len) {
693 INP_RUNLOCK(inp);
694 m_freem(m);
695 return (IPPROTO_DONE);
696 }
697 }
698
699 if (proto == IPPROTO_UDPLITE)
700 UDPLITE_PROBE(receive, NULL, inp, ip, inp, uh);
701 else
702 UDP_PROBE(receive, NULL, inp, ip, inp, uh);
703 if (!udp_append(inp, ip, m, iphlen, udp_in))
704 INP_RUNLOCK(inp);
705 return (IPPROTO_DONE);
706
707 badunlocked:
708 m_freem(m);
709 return (IPPROTO_DONE);
710 }
711 #endif /* INET */
712
713 /*
714 * Notify a udp user of an asynchronous error; just wake up so that they can
715 * collect error status.
716 */
717 struct inpcb *
udp_notify(struct inpcb * inp,int errno)718 udp_notify(struct inpcb *inp, int errno)
719 {
720
721 INP_WLOCK_ASSERT(inp);
722 if ((errno == EHOSTUNREACH || errno == ENETUNREACH ||
723 errno == EHOSTDOWN) && inp->inp_route.ro_nh) {
724 NH_FREE(inp->inp_route.ro_nh);
725 inp->inp_route.ro_nh = (struct nhop_object *)NULL;
726 }
727
728 inp->inp_socket->so_error = errno;
729 sorwakeup(inp->inp_socket);
730 sowwakeup(inp->inp_socket);
731 return (inp);
732 }
733
734 #ifdef INET
735 static void
udp_common_ctlinput(struct icmp * icmp,struct inpcbinfo * pcbinfo)736 udp_common_ctlinput(struct icmp *icmp, struct inpcbinfo *pcbinfo)
737 {
738 struct ip *ip = &icmp->icmp_ip;
739 struct udphdr *uh;
740 struct inpcb *inp;
741
742 if (icmp_errmap(icmp) == 0)
743 return;
744
745 uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
746 inp = in_pcblookup(pcbinfo, ip->ip_dst, uh->uh_dport, ip->ip_src,
747 uh->uh_sport, INPLOOKUP_WLOCKPCB, NULL);
748 if (inp != NULL) {
749 INP_WLOCK_ASSERT(inp);
750 if (inp->inp_socket != NULL)
751 udp_notify(inp, icmp_errmap(icmp));
752 INP_WUNLOCK(inp);
753 } else {
754 inp = in_pcblookup(pcbinfo, ip->ip_dst, uh->uh_dport,
755 ip->ip_src, uh->uh_sport,
756 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, NULL);
757 if (inp != NULL) {
758 struct udpcb *up;
759 udp_tun_icmp_t *func;
760
761 up = intoudpcb(inp);
762 func = up->u_icmp_func;
763 INP_RUNLOCK(inp);
764 if (func != NULL)
765 func(icmp);
766 }
767 }
768 }
769
770 static void
udp_ctlinput(struct icmp * icmp)771 udp_ctlinput(struct icmp *icmp)
772 {
773
774 return (udp_common_ctlinput(icmp, &V_udbinfo));
775 }
776
777 static void
udplite_ctlinput(struct icmp * icmp)778 udplite_ctlinput(struct icmp *icmp)
779 {
780
781 return (udp_common_ctlinput(icmp, &V_ulitecbinfo));
782 }
783 #endif /* INET */
784
785 static int
udp_pcblist(SYSCTL_HANDLER_ARGS)786 udp_pcblist(SYSCTL_HANDLER_ARGS)
787 {
788 struct inpcbinfo *pcbinfo = udp_get_inpcbinfo(arg2);
789 struct inpcb_iterator inpi = INP_ALL_ITERATOR(pcbinfo,
790 INPLOOKUP_RLOCKPCB);
791 struct xinpgen xig;
792 struct inpcb *inp;
793 int error;
794
795 if (req->newptr != 0)
796 return (EPERM);
797
798 if (req->oldptr == 0) {
799 int n;
800
801 n = pcbinfo->ipi_count;
802 n += imax(n / 8, 10);
803 req->oldidx = 2 * (sizeof xig) + n * sizeof(struct xinpcb);
804 return (0);
805 }
806
807 if ((error = sysctl_wire_old_buffer(req, 0)) != 0)
808 return (error);
809
810 bzero(&xig, sizeof(xig));
811 xig.xig_len = sizeof xig;
812 xig.xig_count = pcbinfo->ipi_count;
813 xig.xig_gen = pcbinfo->ipi_gencnt;
814 xig.xig_sogen = so_gencnt;
815 error = SYSCTL_OUT(req, &xig, sizeof xig);
816 if (error)
817 return (error);
818
819 while ((inp = inp_next(&inpi)) != NULL) {
820 if (inp->inp_gencnt <= xig.xig_gen &&
821 cr_canseeinpcb(req->td->td_ucred, inp) == 0) {
822 struct xinpcb xi;
823
824 in_pcbtoxinpcb(inp, &xi);
825 error = SYSCTL_OUT(req, &xi, sizeof xi);
826 if (error) {
827 INP_RUNLOCK(inp);
828 break;
829 }
830 }
831 }
832
833 if (!error) {
834 /*
835 * Give the user an updated idea of our state. If the
836 * generation differs from what we told her before, she knows
837 * that something happened while we were processing this
838 * request, and it might be necessary to retry.
839 */
840 xig.xig_gen = pcbinfo->ipi_gencnt;
841 xig.xig_sogen = so_gencnt;
842 xig.xig_count = pcbinfo->ipi_count;
843 error = SYSCTL_OUT(req, &xig, sizeof xig);
844 }
845
846 return (error);
847 }
848
849 SYSCTL_PROC(_net_inet_udp, UDPCTL_PCBLIST, pcblist,
850 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, IPPROTO_UDP,
851 udp_pcblist, "S,xinpcb",
852 "List of active UDP sockets");
853
854 SYSCTL_PROC(_net_inet_udplite, OID_AUTO, pcblist,
855 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, IPPROTO_UDPLITE,
856 udp_pcblist, "S,xinpcb",
857 "List of active UDP-Lite sockets");
858
859 #ifdef INET
860 static int
udp_getcred(SYSCTL_HANDLER_ARGS)861 udp_getcred(SYSCTL_HANDLER_ARGS)
862 {
863 struct xucred xuc;
864 struct sockaddr_in addrs[2];
865 struct epoch_tracker et;
866 struct inpcb *inp;
867 int error;
868
869 if (req->newptr == NULL)
870 return (EINVAL);
871 error = priv_check(req->td, PRIV_NETINET_GETCRED);
872 if (error)
873 return (error);
874 error = SYSCTL_IN(req, addrs, sizeof(addrs));
875 if (error)
876 return (error);
877 NET_EPOCH_ENTER(et);
878 inp = in_pcblookup(&V_udbinfo, addrs[1].sin_addr, addrs[1].sin_port,
879 addrs[0].sin_addr, addrs[0].sin_port,
880 INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, NULL);
881 NET_EPOCH_EXIT(et);
882 if (inp != NULL) {
883 INP_RLOCK_ASSERT(inp);
884 if (inp->inp_socket == NULL)
885 error = ENOENT;
886 if (error == 0)
887 error = cr_canseeinpcb(req->td->td_ucred, inp);
888 if (error == 0)
889 cru2x(inp->inp_cred, &xuc);
890 INP_RUNLOCK(inp);
891 } else
892 error = ENOENT;
893 if (error == 0)
894 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
895 return (error);
896 }
897
898 SYSCTL_PROC(_net_inet_udp, OID_AUTO, getcred,
899 CTLTYPE_OPAQUE | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_MPSAFE,
900 0, 0, udp_getcred, "S,xucred",
901 "Get the xucred of a UDP connection");
902 #endif /* INET */
903
904 int
udp_ctloutput(struct socket * so,struct sockopt * sopt)905 udp_ctloutput(struct socket *so, struct sockopt *sopt)
906 {
907 struct inpcb *inp;
908 struct udpcb *up;
909 int isudplite, error, optval;
910
911 error = 0;
912 isudplite = (so->so_proto->pr_protocol == IPPROTO_UDPLITE) ? 1 : 0;
913 inp = sotoinpcb(so);
914 KASSERT(inp != NULL, ("%s: inp == NULL", __func__));
915 INP_WLOCK(inp);
916 if (sopt->sopt_level != so->so_proto->pr_protocol) {
917 #ifdef INET6
918 if (INP_CHECK_SOCKAF(so, AF_INET6)) {
919 INP_WUNLOCK(inp);
920 error = ip6_ctloutput(so, sopt);
921 }
922 #endif
923 #if defined(INET) && defined(INET6)
924 else
925 #endif
926 #ifdef INET
927 {
928 INP_WUNLOCK(inp);
929 error = ip_ctloutput(so, sopt);
930 }
931 #endif
932 return (error);
933 }
934
935 switch (sopt->sopt_dir) {
936 case SOPT_SET:
937 switch (sopt->sopt_name) {
938 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
939 #if defined(INET) || defined(INET6)
940 case UDP_ENCAP:
941 #ifdef INET
942 if (INP_SOCKAF(so) == AF_INET) {
943 if (!IPSEC_ENABLED(ipv4)) {
944 INP_WUNLOCK(inp);
945 return (ENOPROTOOPT);
946 }
947 error = UDPENCAP_PCBCTL(ipv4, inp, sopt);
948 break;
949 }
950 #endif /* INET */
951 #ifdef INET6
952 if (INP_SOCKAF(so) == AF_INET6) {
953 if (!IPSEC_ENABLED(ipv6)) {
954 INP_WUNLOCK(inp);
955 return (ENOPROTOOPT);
956 }
957 error = UDPENCAP_PCBCTL(ipv6, inp, sopt);
958 break;
959 }
960 #endif /* INET6 */
961 INP_WUNLOCK(inp);
962 return (EINVAL);
963 #endif /* INET || INET6 */
964
965 #endif /* IPSEC */
966 case UDPLITE_SEND_CSCOV:
967 case UDPLITE_RECV_CSCOV:
968 if (!isudplite) {
969 INP_WUNLOCK(inp);
970 error = ENOPROTOOPT;
971 break;
972 }
973 INP_WUNLOCK(inp);
974 error = sooptcopyin(sopt, &optval, sizeof(optval),
975 sizeof(optval));
976 if (error != 0)
977 break;
978 inp = sotoinpcb(so);
979 KASSERT(inp != NULL, ("%s: inp == NULL", __func__));
980 INP_WLOCK(inp);
981 up = intoudpcb(inp);
982 KASSERT(up != NULL, ("%s: up == NULL", __func__));
983 if ((optval != 0 && optval < 8) || (optval > 65535)) {
984 INP_WUNLOCK(inp);
985 error = EINVAL;
986 break;
987 }
988 if (sopt->sopt_name == UDPLITE_SEND_CSCOV)
989 up->u_txcslen = optval;
990 else
991 up->u_rxcslen = optval;
992 INP_WUNLOCK(inp);
993 break;
994 default:
995 INP_WUNLOCK(inp);
996 error = ENOPROTOOPT;
997 break;
998 }
999 break;
1000 case SOPT_GET:
1001 switch (sopt->sopt_name) {
1002 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
1003 #if defined(INET) || defined(INET6)
1004 case UDP_ENCAP:
1005 #ifdef INET
1006 if (INP_SOCKAF(so) == AF_INET) {
1007 if (!IPSEC_ENABLED(ipv4)) {
1008 INP_WUNLOCK(inp);
1009 return (ENOPROTOOPT);
1010 }
1011 error = UDPENCAP_PCBCTL(ipv4, inp, sopt);
1012 break;
1013 }
1014 #endif /* INET */
1015 #ifdef INET6
1016 if (INP_SOCKAF(so) == AF_INET6) {
1017 if (!IPSEC_ENABLED(ipv6)) {
1018 INP_WUNLOCK(inp);
1019 return (ENOPROTOOPT);
1020 }
1021 error = UDPENCAP_PCBCTL(ipv6, inp, sopt);
1022 break;
1023 }
1024 #endif /* INET6 */
1025 INP_WUNLOCK(inp);
1026 return (EINVAL);
1027 #endif /* INET || INET6 */
1028
1029 #endif /* IPSEC */
1030 case UDPLITE_SEND_CSCOV:
1031 case UDPLITE_RECV_CSCOV:
1032 if (!isudplite) {
1033 INP_WUNLOCK(inp);
1034 error = ENOPROTOOPT;
1035 break;
1036 }
1037 up = intoudpcb(inp);
1038 KASSERT(up != NULL, ("%s: up == NULL", __func__));
1039 if (sopt->sopt_name == UDPLITE_SEND_CSCOV)
1040 optval = up->u_txcslen;
1041 else
1042 optval = up->u_rxcslen;
1043 INP_WUNLOCK(inp);
1044 error = sooptcopyout(sopt, &optval, sizeof(optval));
1045 break;
1046 default:
1047 INP_WUNLOCK(inp);
1048 error = ENOPROTOOPT;
1049 break;
1050 }
1051 break;
1052 }
1053 return (error);
1054 }
1055
1056 #ifdef INET
1057 #ifdef INET6
1058 /* The logic here is derived from ip6_setpktopt(). See comments there. */
1059 static int
udp_v4mapped_pktinfo(struct cmsghdr * cm,struct sockaddr_in * src,struct inpcb * inp,int flags)1060 udp_v4mapped_pktinfo(struct cmsghdr *cm, struct sockaddr_in * src,
1061 struct inpcb *inp, int flags)
1062 {
1063 struct ifnet *ifp;
1064 struct in6_pktinfo *pktinfo;
1065 struct in_addr ia;
1066
1067 NET_EPOCH_ASSERT();
1068
1069 if ((flags & PRUS_IPV6) == 0)
1070 return (0);
1071
1072 if (cm->cmsg_level != IPPROTO_IPV6)
1073 return (0);
1074
1075 if (cm->cmsg_type != IPV6_2292PKTINFO &&
1076 cm->cmsg_type != IPV6_PKTINFO)
1077 return (0);
1078
1079 if (cm->cmsg_len !=
1080 CMSG_LEN(sizeof(struct in6_pktinfo)))
1081 return (EINVAL);
1082
1083 pktinfo = (struct in6_pktinfo *)CMSG_DATA(cm);
1084 if (!IN6_IS_ADDR_V4MAPPED(&pktinfo->ipi6_addr) &&
1085 !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr))
1086 return (EINVAL);
1087
1088 /* Validate the interface index if specified. */
1089 if (pktinfo->ipi6_ifindex) {
1090 ifp = ifnet_byindex(pktinfo->ipi6_ifindex);
1091 if (ifp == NULL)
1092 return (ENXIO);
1093 } else
1094 ifp = NULL;
1095 if (ifp != NULL && !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) {
1096 ia.s_addr = pktinfo->ipi6_addr.s6_addr32[3];
1097 if (!in_ifhasaddr(ifp, ia))
1098 return (EADDRNOTAVAIL);
1099 }
1100
1101 bzero(src, sizeof(*src));
1102 src->sin_family = AF_INET;
1103 src->sin_len = sizeof(*src);
1104 src->sin_port = inp->inp_lport;
1105 src->sin_addr.s_addr = pktinfo->ipi6_addr.s6_addr32[3];
1106
1107 return (0);
1108 }
1109 #endif /* INET6 */
1110
1111 int
udp_send(struct socket * so,int flags,struct mbuf * m,struct sockaddr * addr,struct mbuf * control,struct thread * td)1112 udp_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
1113 struct mbuf *control, struct thread *td)
1114 {
1115 struct inpcb *inp;
1116 struct udpiphdr *ui;
1117 int len, error = 0;
1118 struct in_addr faddr, laddr;
1119 struct cmsghdr *cm;
1120 struct inpcbinfo *pcbinfo;
1121 struct sockaddr_in *sin, src;
1122 struct epoch_tracker et;
1123 int cscov_partial = 0;
1124 int ipflags = 0;
1125 u_short fport, lport;
1126 u_char tos, vflagsav;
1127 uint8_t pr;
1128 uint16_t cscov = 0;
1129 uint32_t hash_val, hash_type, flowid = 0;
1130 uint8_t flowtype = M_HASHTYPE_NONE;
1131 bool use_cached_route;
1132
1133 inp = sotoinpcb(so);
1134 KASSERT(inp != NULL, ("udp_send: inp == NULL"));
1135
1136 if (addr != NULL) {
1137 if (addr->sa_family != AF_INET)
1138 error = EAFNOSUPPORT;
1139 else if (addr->sa_len != sizeof(struct sockaddr_in))
1140 error = EINVAL;
1141 if (__predict_false(error != 0)) {
1142 m_freem(control);
1143 m_freem(m);
1144 return (error);
1145 }
1146 }
1147
1148 len = m->m_pkthdr.len;
1149 if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) {
1150 if (control)
1151 m_freem(control);
1152 m_freem(m);
1153 return (EMSGSIZE);
1154 }
1155
1156 src.sin_family = 0;
1157 sin = (struct sockaddr_in *)addr;
1158
1159 /*
1160 * udp_send() may need to bind the current inpcb. As such, we don't
1161 * know up front whether we will need the pcbinfo lock or not. Do any
1162 * work to decide what is needed up front before acquiring any locks.
1163 *
1164 * We will need network epoch in either case, to safely lookup into
1165 * pcb hash.
1166 */
1167 use_cached_route = sin == NULL || (inp->inp_laddr.s_addr == INADDR_ANY && inp->inp_lport == 0);
1168 if (use_cached_route || (flags & PRUS_IPV6) != 0)
1169 INP_WLOCK(inp);
1170 else
1171 INP_RLOCK(inp);
1172 NET_EPOCH_ENTER(et);
1173 #ifdef INET6
1174 if ((flags & PRUS_IPV6) != 0) {
1175 if ((inp->in6p_outputopts != NULL) &&
1176 (inp->in6p_outputopts->ip6po_tclass != -1))
1177 tos = (u_char)inp->in6p_outputopts->ip6po_tclass;
1178 else
1179 tos = 0;
1180 } else {
1181 tos = inp->inp_ip_tos;
1182 }
1183 #else
1184 tos = inp->inp_ip_tos;
1185 #endif
1186 if (control != NULL) {
1187 /*
1188 * XXX: Currently, we assume all the optional information is
1189 * stored in a single mbuf.
1190 */
1191 if (control->m_next) {
1192 m_freem(control);
1193 error = EINVAL;
1194 goto release;
1195 }
1196 for (; control->m_len > 0;
1197 control->m_data += CMSG_ALIGN(cm->cmsg_len),
1198 control->m_len -= CMSG_ALIGN(cm->cmsg_len)) {
1199 cm = mtod(control, struct cmsghdr *);
1200 if (control->m_len < sizeof(*cm) || cm->cmsg_len == 0
1201 || cm->cmsg_len > control->m_len) {
1202 error = EINVAL;
1203 break;
1204 }
1205 #ifdef INET6
1206 error = udp_v4mapped_pktinfo(cm, &src, inp, flags);
1207 if (error != 0)
1208 break;
1209 if (((flags & PRUS_IPV6) != 0) &&
1210 (cm->cmsg_level == IPPROTO_IPV6) &&
1211 (cm->cmsg_type == IPV6_TCLASS)) {
1212 int tclass;
1213
1214 if (cm->cmsg_len != CMSG_LEN(sizeof(int))) {
1215 error = EINVAL;
1216 break;
1217 }
1218 tclass = *(int *)CMSG_DATA(cm);
1219 if (tclass < -1 || tclass > 255) {
1220 error = EINVAL;
1221 break;
1222 }
1223 if (tclass != -1)
1224 tos = (u_char)tclass;
1225 }
1226 #endif
1227 if (cm->cmsg_level != IPPROTO_IP)
1228 continue;
1229
1230 switch (cm->cmsg_type) {
1231 case IP_SENDSRCADDR:
1232 if (cm->cmsg_len !=
1233 CMSG_LEN(sizeof(struct in_addr))) {
1234 error = EINVAL;
1235 break;
1236 }
1237 bzero(&src, sizeof(src));
1238 src.sin_family = AF_INET;
1239 src.sin_len = sizeof(src);
1240 src.sin_port = inp->inp_lport;
1241 src.sin_addr =
1242 *(struct in_addr *)CMSG_DATA(cm);
1243 break;
1244
1245 case IP_TOS:
1246 if (cm->cmsg_len != CMSG_LEN(sizeof(u_char))) {
1247 error = EINVAL;
1248 break;
1249 }
1250 tos = *(u_char *)CMSG_DATA(cm);
1251 break;
1252
1253 case IP_FLOWID:
1254 if (cm->cmsg_len != CMSG_LEN(sizeof(uint32_t))) {
1255 error = EINVAL;
1256 break;
1257 }
1258 flowid = *(uint32_t *) CMSG_DATA(cm);
1259 break;
1260
1261 case IP_FLOWTYPE:
1262 if (cm->cmsg_len != CMSG_LEN(sizeof(uint32_t))) {
1263 error = EINVAL;
1264 break;
1265 }
1266 flowtype = *(uint32_t *) CMSG_DATA(cm);
1267 break;
1268
1269 #ifdef RSS
1270 case IP_RSSBUCKETID:
1271 if (cm->cmsg_len != CMSG_LEN(sizeof(uint32_t))) {
1272 error = EINVAL;
1273 break;
1274 }
1275 /* This is just a placeholder for now */
1276 break;
1277 #endif /* RSS */
1278 default:
1279 error = ENOPROTOOPT;
1280 break;
1281 }
1282 if (error)
1283 break;
1284 }
1285 m_freem(control);
1286 control = NULL;
1287 }
1288 if (error)
1289 goto release;
1290
1291 pr = inp->inp_socket->so_proto->pr_protocol;
1292 pcbinfo = udp_get_inpcbinfo(pr);
1293
1294 /*
1295 * If the IP_SENDSRCADDR control message was specified, override the
1296 * source address for this datagram. Its use is invalidated if the
1297 * address thus specified is incomplete or clobbers other inpcbs.
1298 */
1299 laddr = inp->inp_laddr;
1300 lport = inp->inp_lport;
1301 if (src.sin_family == AF_INET) {
1302 if ((lport == 0) ||
1303 (laddr.s_addr == INADDR_ANY &&
1304 src.sin_addr.s_addr == INADDR_ANY)) {
1305 error = EINVAL;
1306 goto release;
1307 }
1308 if ((flags & PRUS_IPV6) != 0) {
1309 vflagsav = inp->inp_vflag;
1310 inp->inp_vflag |= INP_IPV4;
1311 inp->inp_vflag &= ~INP_IPV6;
1312 }
1313 INP_HASH_WLOCK(pcbinfo);
1314 error = in_pcbbind_setup(inp, &src, &laddr.s_addr, &lport,
1315 V_udp_bind_all_fibs ? 0 : INPBIND_FIB, td->td_ucred);
1316 INP_HASH_WUNLOCK(pcbinfo);
1317 if ((flags & PRUS_IPV6) != 0)
1318 inp->inp_vflag = vflagsav;
1319 if (error)
1320 goto release;
1321 }
1322
1323 /*
1324 * If a UDP socket has been connected, then a local address/port will
1325 * have been selected and bound.
1326 *
1327 * If a UDP socket has not been connected to, then an explicit
1328 * destination address must be used, in which case a local
1329 * address/port may not have been selected and bound.
1330 */
1331 if (sin != NULL) {
1332 INP_LOCK_ASSERT(inp);
1333 if (inp->inp_faddr.s_addr != INADDR_ANY) {
1334 error = EISCONN;
1335 goto release;
1336 }
1337
1338 /*
1339 * Jail may rewrite the destination address, so let it do
1340 * that before we use it.
1341 */
1342 error = prison_remote_ip4(td->td_ucred, &sin->sin_addr);
1343 if (error)
1344 goto release;
1345 /*
1346 * sendto(2) on unconnected UDP socket results in implicit
1347 * binding to INADDR_ANY and anonymous port. This has two
1348 * side effects:
1349 * 1) after first sendto(2) the socket will receive datagrams
1350 * destined to the selected port.
1351 * 2) subsequent sendto(2) calls will use the same source port.
1352 */
1353 if (inp->inp_lport == 0) {
1354 struct sockaddr_in wild = {
1355 .sin_family = AF_INET,
1356 .sin_len = sizeof(struct sockaddr_in),
1357 };
1358
1359 INP_HASH_WLOCK(pcbinfo);
1360 error = in_pcbbind(inp, &wild, V_udp_bind_all_fibs ?
1361 0 : INPBIND_FIB, td->td_ucred);
1362 INP_HASH_WUNLOCK(pcbinfo);
1363 if (error)
1364 goto release;
1365 lport = inp->inp_lport;
1366 laddr = inp->inp_laddr;
1367 }
1368 if (laddr.s_addr == INADDR_ANY) {
1369 error = in_pcbladdr(inp, &sin->sin_addr, &laddr,
1370 td->td_ucred);
1371 if (error)
1372 goto release;
1373 }
1374 faddr = sin->sin_addr;
1375 fport = sin->sin_port;
1376 } else {
1377 INP_LOCK_ASSERT(inp);
1378 faddr = inp->inp_faddr;
1379 fport = inp->inp_fport;
1380 if (faddr.s_addr == INADDR_ANY) {
1381 error = ENOTCONN;
1382 goto release;
1383 }
1384 }
1385
1386 /*
1387 * Calculate data length and get a mbuf for UDP, IP, and possible
1388 * link-layer headers. Immediate slide the data pointer back forward
1389 * since we won't use that space at this layer.
1390 */
1391 M_PREPEND(m, sizeof(struct udpiphdr) + max_linkhdr, M_NOWAIT);
1392 if (m == NULL) {
1393 error = ENOBUFS;
1394 goto release;
1395 }
1396 m->m_data += max_linkhdr;
1397 m->m_len -= max_linkhdr;
1398 m->m_pkthdr.len -= max_linkhdr;
1399
1400 /*
1401 * Fill in mbuf with extended UDP header and addresses and length put
1402 * into network format.
1403 */
1404 ui = mtod(m, struct udpiphdr *);
1405 /*
1406 * Filling only those fields of udpiphdr that participate in the
1407 * checksum calculation. The rest must be zeroed and will be filled
1408 * later.
1409 */
1410 bzero(ui->ui_x1, sizeof(ui->ui_x1));
1411 ui->ui_pr = pr;
1412 ui->ui_src = laddr;
1413 ui->ui_dst = faddr;
1414 ui->ui_sport = lport;
1415 ui->ui_dport = fport;
1416 ui->ui_ulen = htons((u_short)len + sizeof(struct udphdr));
1417 if (pr == IPPROTO_UDPLITE) {
1418 struct udpcb *up;
1419 uint16_t plen;
1420
1421 up = intoudpcb(inp);
1422 cscov = up->u_txcslen;
1423 plen = (u_short)len + sizeof(struct udphdr);
1424 if (cscov >= plen)
1425 cscov = 0;
1426 ui->ui_len = htons(plen);
1427 ui->ui_ulen = htons(cscov);
1428 /*
1429 * For UDP-Lite, checksum coverage length of zero means
1430 * the entire UDPLite packet is covered by the checksum.
1431 */
1432 cscov_partial = (cscov == 0) ? 0 : 1;
1433 }
1434
1435 if (inp->inp_socket->so_options & SO_DONTROUTE)
1436 ipflags |= IP_ROUTETOIF;
1437 if (inp->inp_socket->so_options & SO_BROADCAST)
1438 ipflags |= IP_ALLOWBROADCAST;
1439 if (inp->inp_flags & INP_ONESBCAST)
1440 ipflags |= IP_SENDONES;
1441
1442 #ifdef MAC
1443 mac_inpcb_create_mbuf(inp, m);
1444 #endif
1445
1446 /*
1447 * Set up checksum and output datagram.
1448 */
1449 ui->ui_sum = 0;
1450 if (pr == IPPROTO_UDPLITE) {
1451 if (inp->inp_flags & INP_ONESBCAST)
1452 faddr.s_addr = INADDR_BROADCAST;
1453 if (cscov_partial) {
1454 if ((ui->ui_sum = in_cksum(m, sizeof(struct ip) + cscov)) == 0)
1455 ui->ui_sum = 0xffff;
1456 } else {
1457 if ((ui->ui_sum = in_cksum(m, sizeof(struct udpiphdr) + len)) == 0)
1458 ui->ui_sum = 0xffff;
1459 }
1460 } else if (V_udp_cksum) {
1461 if (inp->inp_flags & INP_ONESBCAST)
1462 faddr.s_addr = INADDR_BROADCAST;
1463 ui->ui_sum = in_pseudo(ui->ui_src.s_addr, faddr.s_addr,
1464 htons((u_short)len + sizeof(struct udphdr) + pr));
1465 m->m_pkthdr.csum_flags = CSUM_UDP;
1466 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
1467 }
1468 /*
1469 * After finishing the checksum computation, fill the remaining fields
1470 * of udpiphdr.
1471 */
1472 ((struct ip *)ui)->ip_v = IPVERSION;
1473 ((struct ip *)ui)->ip_tos = tos;
1474 ((struct ip *)ui)->ip_len = htons(sizeof(struct udpiphdr) + len);
1475 if (inp->inp_flags & INP_DONTFRAG)
1476 ((struct ip *)ui)->ip_off |= htons(IP_DF);
1477 ((struct ip *)ui)->ip_ttl = inp->inp_ip_ttl;
1478 UDPSTAT_INC(udps_opackets);
1479
1480 /*
1481 * Setup flowid / RSS information for outbound socket.
1482 *
1483 * Once the UDP code decides to set a flowid some other way,
1484 * this allows the flowid to be overridden by userland.
1485 */
1486 if (flowtype != M_HASHTYPE_NONE) {
1487 m->m_pkthdr.flowid = flowid;
1488 M_HASHTYPE_SET(m, flowtype);
1489 } else if (CALC_FLOWID_OUTBOUND_SENDTO) {
1490 hash_val = fib4_calc_packet_hash(laddr, faddr,
1491 lport, fport, pr, &hash_type);
1492 m->m_pkthdr.flowid = hash_val;
1493 M_HASHTYPE_SET(m, hash_type);
1494 }
1495
1496 /*
1497 * Don't override with the inp cached flowid value.
1498 *
1499 * Depending upon the kind of send being done, the inp
1500 * flowid/flowtype values may actually not be appropriate
1501 * for this particular socket send.
1502 *
1503 * We should either leave the flowid at zero (which is what is
1504 * currently done) or set it to some software generated
1505 * hash value based on the packet contents.
1506 */
1507 ipflags |= IP_NODEFAULTFLOWID;
1508
1509 if (pr == IPPROTO_UDPLITE)
1510 UDPLITE_PROBE(send, NULL, inp, &ui->ui_i, inp, &ui->ui_u);
1511 else
1512 UDP_PROBE(send, NULL, inp, &ui->ui_i, inp, &ui->ui_u);
1513 error = ip_output(m, inp->inp_options,
1514 use_cached_route ? &inp->inp_route : NULL, ipflags,
1515 inp->inp_moptions, inp);
1516 INP_UNLOCK(inp);
1517 NET_EPOCH_EXIT(et);
1518 return (error);
1519
1520 release:
1521 INP_UNLOCK(inp);
1522 NET_EPOCH_EXIT(et);
1523 m_freem(m);
1524 return (error);
1525 }
1526
1527 void
udp_abort(struct socket * so)1528 udp_abort(struct socket *so)
1529 {
1530 struct inpcb *inp;
1531 struct inpcbinfo *pcbinfo;
1532
1533 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1534 inp = sotoinpcb(so);
1535 KASSERT(inp != NULL, ("udp_abort: inp == NULL"));
1536 INP_WLOCK(inp);
1537 if (inp->inp_faddr.s_addr != INADDR_ANY) {
1538 INP_HASH_WLOCK(pcbinfo);
1539 in_pcbdisconnect(inp);
1540 INP_HASH_WUNLOCK(pcbinfo);
1541 soisdisconnected(so);
1542 }
1543 INP_WUNLOCK(inp);
1544 }
1545
1546 static int
udp_attach(struct socket * so,int proto,struct thread * td)1547 udp_attach(struct socket *so, int proto, struct thread *td)
1548 {
1549 static uint32_t udp_flowid;
1550 struct inpcbinfo *pcbinfo;
1551 struct inpcb *inp;
1552 struct udpcb *up;
1553 int error;
1554
1555 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1556 inp = sotoinpcb(so);
1557 KASSERT(inp == NULL, ("udp_attach: inp != NULL"));
1558 error = soreserve(so, udp_sendspace, udp_recvspace);
1559 if (error)
1560 return (error);
1561 error = in_pcballoc(so, pcbinfo);
1562 if (error)
1563 return (error);
1564
1565 inp = sotoinpcb(so);
1566 inp->inp_ip_ttl = V_ip_defttl;
1567 inp->inp_flowid = atomic_fetchadd_int(&udp_flowid, 1);
1568 inp->inp_flowtype = M_HASHTYPE_OPAQUE;
1569 up = intoudpcb(inp);
1570 bzero(&up->u_start_zero, u_zero_size);
1571 INP_WUNLOCK(inp);
1572
1573 return (0);
1574 }
1575 #endif /* INET */
1576
1577 int
udp_set_kernel_tunneling(struct socket * so,udp_tun_func_t f,udp_tun_icmp_t i,void * ctx)1578 udp_set_kernel_tunneling(struct socket *so, udp_tun_func_t f, udp_tun_icmp_t i, void *ctx)
1579 {
1580 struct inpcb *inp;
1581 struct udpcb *up;
1582
1583 KASSERT(so->so_type == SOCK_DGRAM,
1584 ("udp_set_kernel_tunneling: !dgram"));
1585 inp = sotoinpcb(so);
1586 KASSERT(inp != NULL, ("udp_set_kernel_tunneling: inp == NULL"));
1587 INP_WLOCK(inp);
1588 up = intoudpcb(inp);
1589 if ((f != NULL || i != NULL) && ((up->u_tun_func != NULL) ||
1590 (up->u_icmp_func != NULL))) {
1591 INP_WUNLOCK(inp);
1592 return (EBUSY);
1593 }
1594 up->u_tun_func = f;
1595 up->u_icmp_func = i;
1596 up->u_tun_ctx = ctx;
1597 INP_WUNLOCK(inp);
1598 return (0);
1599 }
1600
1601 #ifdef INET
1602 static int
udp_bind(struct socket * so,struct sockaddr * nam,struct thread * td)1603 udp_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
1604 {
1605 struct inpcb *inp;
1606 struct inpcbinfo *pcbinfo;
1607 struct sockaddr_in *sinp;
1608 int error;
1609
1610 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1611 inp = sotoinpcb(so);
1612 KASSERT(inp != NULL, ("udp_bind: inp == NULL"));
1613
1614 sinp = (struct sockaddr_in *)nam;
1615 if (nam->sa_family != AF_INET) {
1616 /*
1617 * Preserve compatibility with old programs.
1618 */
1619 if (nam->sa_family != AF_UNSPEC ||
1620 nam->sa_len < offsetof(struct sockaddr_in, sin_zero) ||
1621 sinp->sin_addr.s_addr != INADDR_ANY)
1622 return (EAFNOSUPPORT);
1623 nam->sa_family = AF_INET;
1624 }
1625 if (nam->sa_len != sizeof(struct sockaddr_in))
1626 return (EINVAL);
1627
1628 INP_WLOCK(inp);
1629 INP_HASH_WLOCK(pcbinfo);
1630 error = in_pcbbind(inp, sinp, V_udp_bind_all_fibs ? 0 : INPBIND_FIB,
1631 td->td_ucred);
1632 INP_HASH_WUNLOCK(pcbinfo);
1633 INP_WUNLOCK(inp);
1634 return (error);
1635 }
1636
1637 static void
udp_close(struct socket * so)1638 udp_close(struct socket *so)
1639 {
1640 struct inpcb *inp;
1641 struct inpcbinfo *pcbinfo;
1642
1643 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1644 inp = sotoinpcb(so);
1645 KASSERT(inp != NULL, ("udp_close: inp == NULL"));
1646 INP_WLOCK(inp);
1647 if (inp->inp_faddr.s_addr != INADDR_ANY) {
1648 INP_HASH_WLOCK(pcbinfo);
1649 in_pcbdisconnect(inp);
1650 INP_HASH_WUNLOCK(pcbinfo);
1651 soisdisconnected(so);
1652 }
1653 INP_WUNLOCK(inp);
1654 }
1655
1656 static int
udp_connect(struct socket * so,struct sockaddr * nam,struct thread * td)1657 udp_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
1658 {
1659 struct epoch_tracker et;
1660 struct inpcb *inp;
1661 struct inpcbinfo *pcbinfo;
1662 struct sockaddr_in *sin;
1663 int error;
1664
1665 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1666 inp = sotoinpcb(so);
1667 KASSERT(inp != NULL, ("udp_connect: inp == NULL"));
1668
1669 sin = (struct sockaddr_in *)nam;
1670 if (sin->sin_family != AF_INET)
1671 return (EAFNOSUPPORT);
1672 if (sin->sin_len != sizeof(*sin))
1673 return (EINVAL);
1674
1675 INP_WLOCK(inp);
1676 if (inp->inp_faddr.s_addr != INADDR_ANY) {
1677 INP_WUNLOCK(inp);
1678 return (EISCONN);
1679 }
1680 error = prison_remote_ip4(td->td_ucred, &sin->sin_addr);
1681 if (error != 0) {
1682 INP_WUNLOCK(inp);
1683 return (error);
1684 }
1685 NET_EPOCH_ENTER(et);
1686 INP_HASH_WLOCK(pcbinfo);
1687 error = in_pcbconnect(inp, sin, td->td_ucred);
1688 INP_HASH_WUNLOCK(pcbinfo);
1689 NET_EPOCH_EXIT(et);
1690 if (error == 0)
1691 soisconnected(so);
1692 INP_WUNLOCK(inp);
1693 return (error);
1694 }
1695
1696 static void
udp_detach(struct socket * so)1697 udp_detach(struct socket *so)
1698 {
1699 struct inpcb *inp;
1700
1701 inp = sotoinpcb(so);
1702 KASSERT(inp != NULL, ("udp_detach: inp == NULL"));
1703 KASSERT(inp->inp_faddr.s_addr == INADDR_ANY,
1704 ("udp_detach: not disconnected"));
1705 INP_WLOCK(inp);
1706 in_pcbfree(inp);
1707 }
1708
1709 int
udp_disconnect(struct socket * so)1710 udp_disconnect(struct socket *so)
1711 {
1712 struct inpcb *inp;
1713 struct inpcbinfo *pcbinfo;
1714
1715 pcbinfo = udp_get_inpcbinfo(so->so_proto->pr_protocol);
1716 inp = sotoinpcb(so);
1717 KASSERT(inp != NULL, ("udp_disconnect: inp == NULL"));
1718 INP_WLOCK(inp);
1719 if (inp->inp_faddr.s_addr == INADDR_ANY) {
1720 INP_WUNLOCK(inp);
1721 return (ENOTCONN);
1722 }
1723 INP_HASH_WLOCK(pcbinfo);
1724 in_pcbdisconnect(inp);
1725 INP_HASH_WUNLOCK(pcbinfo);
1726 SOCK_LOCK(so);
1727 so->so_state &= ~SS_ISCONNECTED; /* XXX */
1728 SOCK_UNLOCK(so);
1729 INP_WUNLOCK(inp);
1730 return (0);
1731 }
1732 #endif /* INET */
1733
1734 int
udp_shutdown(struct socket * so,enum shutdown_how how)1735 udp_shutdown(struct socket *so, enum shutdown_how how)
1736 {
1737 int error;
1738
1739 SOCK_LOCK(so);
1740 if (!(so->so_state & SS_ISCONNECTED))
1741 /*
1742 * POSIX mandates us to just return ENOTCONN when shutdown(2) is
1743 * invoked on a datagram sockets, however historically we would
1744 * actually tear socket down. This is known to be leveraged by
1745 * some applications to unblock process waiting in recv(2) by
1746 * other process that it shares that socket with. Try to meet
1747 * both backward-compatibility and POSIX requirements by forcing
1748 * ENOTCONN but still flushing buffers and performing wakeup(9).
1749 *
1750 * XXXGL: it remains unknown what applications expect this
1751 * behavior and is this isolated to unix/dgram or inet/dgram or
1752 * both. See: D10351, D3039.
1753 */
1754 error = ENOTCONN;
1755 else
1756 error = 0;
1757 SOCK_UNLOCK(so);
1758
1759 switch (how) {
1760 case SHUT_RD:
1761 sorflush(so);
1762 break;
1763 case SHUT_RDWR:
1764 sorflush(so);
1765 /* FALLTHROUGH */
1766 case SHUT_WR:
1767 socantsendmore(so);
1768 }
1769
1770 return (error);
1771 }
1772
1773 #ifdef INET
1774 #define UDP_PROTOSW \
1775 .pr_type = SOCK_DGRAM, \
1776 .pr_flags = PR_ATOMIC | PR_ADDR | PR_CAPATTACH, \
1777 .pr_ctloutput = udp_ctloutput, \
1778 .pr_abort = udp_abort, \
1779 .pr_attach = udp_attach, \
1780 .pr_bind = udp_bind, \
1781 .pr_connect = udp_connect, \
1782 .pr_control = in_control, \
1783 .pr_detach = udp_detach, \
1784 .pr_disconnect = udp_disconnect, \
1785 .pr_peeraddr = in_getpeeraddr, \
1786 .pr_send = udp_send, \
1787 .pr_soreceive = soreceive_dgram, \
1788 .pr_sosend = sosend_dgram, \
1789 .pr_shutdown = udp_shutdown, \
1790 .pr_sockaddr = in_getsockaddr, \
1791 .pr_sosetlabel = in_pcbsosetlabel, \
1792 .pr_close = udp_close
1793
1794 struct protosw udp_protosw = {
1795 .pr_protocol = IPPROTO_UDP,
1796 UDP_PROTOSW
1797 };
1798
1799 struct protosw udplite_protosw = {
1800 .pr_protocol = IPPROTO_UDPLITE,
1801 UDP_PROTOSW
1802 };
1803
1804 static void
udp_init(void * arg __unused)1805 udp_init(void *arg __unused)
1806 {
1807
1808 IPPROTO_REGISTER(IPPROTO_UDP, udp_input, udp_ctlinput);
1809 IPPROTO_REGISTER(IPPROTO_UDPLITE, udp_input, udplite_ctlinput);
1810 }
1811 SYSINIT(udp_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, udp_init, NULL);
1812 #endif /* INET */
1813