1 | /* |
2 | * Copyright (c) 2000-2018 Apple Inc. All rights reserved. |
3 | * |
4 | * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ |
5 | * |
6 | * This file contains Original Code and/or Modifications of Original Code |
7 | * as defined in and that are subject to the Apple Public Source License |
8 | * Version 2.0 (the 'License'). You may not use this file except in |
9 | * compliance with the License. The rights granted to you under the License |
10 | * may not be used to create, or enable the creation or redistribution of, |
11 | * unlawful or unlicensed copies of an Apple operating system, or to |
12 | * circumvent, violate, or enable the circumvention or violation of, any |
13 | * terms of an Apple operating system software license agreement. |
14 | * |
15 | * Please obtain a copy of the License at |
16 | * http://www.opensource.apple.com/apsl/ and read it before using this file. |
17 | * |
18 | * The Original Code and all software distributed under the License are |
19 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER |
20 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, |
21 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, |
22 | * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. |
23 | * Please see the License for the specific language governing rights and |
24 | * limitations under the License. |
25 | * |
26 | * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ |
27 | */ |
28 | /* |
29 | * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995 |
30 | * The Regents of the University of California. All rights reserved. |
31 | * |
32 | * Redistribution and use in source and binary forms, with or without |
33 | * modification, are permitted provided that the following conditions |
34 | * are met: |
35 | * 1. Redistributions of source code must retain the above copyright |
36 | * notice, this list of conditions and the following disclaimer. |
37 | * 2. Redistributions in binary form must reproduce the above copyright |
38 | * notice, this list of conditions and the following disclaimer in the |
39 | * documentation and/or other materials provided with the distribution. |
40 | * 3. All advertising materials mentioning features or use of this software |
41 | * must display the following acknowledgement: |
42 | * This product includes software developed by the University of |
43 | * California, Berkeley and its contributors. |
44 | * 4. Neither the name of the University nor the names of its contributors |
45 | * may be used to endorse or promote products derived from this software |
46 | * without specific prior written permission. |
47 | * |
48 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
49 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
50 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
51 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
52 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
53 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
54 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
55 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
56 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
57 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
58 | * SUCH DAMAGE. |
59 | * |
60 | * @(#)udp_usrreq.c 8.6 (Berkeley) 5/23/95 |
61 | */ |
62 | |
63 | #include <sys/param.h> |
64 | #include <sys/systm.h> |
65 | #include <sys/kernel.h> |
66 | #include <sys/malloc.h> |
67 | #include <sys/mbuf.h> |
68 | #include <sys/domain.h> |
69 | #include <sys/protosw.h> |
70 | #include <sys/socket.h> |
71 | #include <sys/socketvar.h> |
72 | #include <sys/sysctl.h> |
73 | #include <sys/syslog.h> |
74 | #include <sys/mcache.h> |
75 | #include <net/ntstat.h> |
76 | |
77 | #include <kern/zalloc.h> |
78 | #include <mach/boolean.h> |
79 | |
80 | #include <net/if.h> |
81 | #include <net/if_types.h> |
82 | #include <net/route.h> |
83 | #include <net/dlil.h> |
84 | #include <net/net_api_stats.h> |
85 | |
86 | #include <netinet/in.h> |
87 | #include <netinet/in_systm.h> |
88 | #include <netinet/in_tclass.h> |
89 | #include <netinet/ip.h> |
90 | #if INET6 |
91 | #include <netinet/ip6.h> |
92 | #endif /* INET6 */ |
93 | #include <netinet/in_pcb.h> |
94 | #include <netinet/in_var.h> |
95 | #include <netinet/ip_var.h> |
96 | #if INET6 |
97 | #include <netinet6/in6_pcb.h> |
98 | #include <netinet6/ip6_var.h> |
99 | #include <netinet6/udp6_var.h> |
100 | #endif /* INET6 */ |
101 | #include <netinet/ip_icmp.h> |
102 | #include <netinet/icmp_var.h> |
103 | #include <netinet/udp.h> |
104 | #include <netinet/udp_var.h> |
105 | #include <sys/kdebug.h> |
106 | |
107 | #if IPSEC |
108 | #include <netinet6/ipsec.h> |
109 | #include <netinet6/esp.h> |
110 | extern int ipsec_bypass; |
111 | extern int esp_udp_encap_port; |
112 | #endif /* IPSEC */ |
113 | |
114 | #if NECP |
115 | #include <net/necp.h> |
116 | #endif /* NECP */ |
117 | |
118 | #if FLOW_DIVERT |
119 | #include <netinet/flow_divert.h> |
120 | #endif /* FLOW_DIVERT */ |
121 | |
122 | #if CONTENT_FILTER |
123 | #include <net/content_filter.h> |
124 | #endif /* CONTENT_FILTER */ |
125 | |
126 | #define DBG_LAYER_IN_BEG NETDBG_CODE(DBG_NETUDP, 0) |
127 | #define DBG_LAYER_IN_END NETDBG_CODE(DBG_NETUDP, 2) |
128 | #define DBG_LAYER_OUT_BEG NETDBG_CODE(DBG_NETUDP, 1) |
129 | #define DBG_LAYER_OUT_END NETDBG_CODE(DBG_NETUDP, 3) |
130 | #define DBG_FNC_UDP_INPUT NETDBG_CODE(DBG_NETUDP, (5 << 8)) |
131 | #define DBG_FNC_UDP_OUTPUT NETDBG_CODE(DBG_NETUDP, (6 << 8) | 1) |
132 | |
133 | /* |
134 | * UDP protocol implementation. |
135 | * Per RFC 768, August, 1980. |
136 | */ |
137 | #ifndef COMPAT_42 |
138 | static int udpcksum = 1; |
139 | #else |
140 | static int udpcksum = 0; /* XXX */ |
141 | #endif |
142 | SYSCTL_INT(_net_inet_udp, UDPCTL_CHECKSUM, checksum, |
143 | CTLFLAG_RW | CTLFLAG_LOCKED, &udpcksum, 0, "" ); |
144 | |
145 | int udp_log_in_vain = 0; |
146 | SYSCTL_INT(_net_inet_udp, OID_AUTO, log_in_vain, CTLFLAG_RW | CTLFLAG_LOCKED, |
147 | &udp_log_in_vain, 0, "Log all incoming UDP packets" ); |
148 | |
149 | static int blackhole = 0; |
150 | SYSCTL_INT(_net_inet_udp, OID_AUTO, blackhole, CTLFLAG_RW | CTLFLAG_LOCKED, |
151 | &blackhole, 0, "Do not send port unreachables for refused connects" ); |
152 | |
153 | struct inpcbhead udb; /* from udp_var.h */ |
154 | #define udb6 udb /* for KAME src sync over BSD*'s */ |
155 | struct inpcbinfo udbinfo; |
156 | |
157 | #ifndef UDBHASHSIZE |
158 | #define UDBHASHSIZE 16 |
159 | #endif |
160 | |
161 | /* Garbage collection performed during most recent udp_gc() run */ |
162 | static boolean_t udp_gc_done = FALSE; |
163 | |
164 | #if IPFIREWALL |
165 | extern int fw_verbose; |
166 | extern void ipfwsyslog(int level, const char *format, ...); |
167 | extern void ipfw_stealth_stats_incr_udp(void); |
168 | |
169 | /* Apple logging, log to ipfw.log */ |
170 | #define log_in_vain_log(a) { \ |
171 | if ((udp_log_in_vain == 3) && (fw_verbose == 2)) { \ |
172 | ipfwsyslog a; \ |
173 | } else if ((udp_log_in_vain == 4) && (fw_verbose == 2)) { \ |
174 | ipfw_stealth_stats_incr_udp(); \ |
175 | } else { \ |
176 | log a; \ |
177 | } \ |
178 | } |
179 | #else /* !IPFIREWALL */ |
180 | #define log_in_vain_log(a) { log a; } |
181 | #endif /* !IPFIREWALL */ |
182 | |
183 | static int udp_getstat SYSCTL_HANDLER_ARGS; |
184 | struct udpstat udpstat; /* from udp_var.h */ |
185 | SYSCTL_PROC(_net_inet_udp, UDPCTL_STATS, stats, |
186 | CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_LOCKED, |
187 | 0, 0, udp_getstat, "S,udpstat" , |
188 | "UDP statistics (struct udpstat, netinet/udp_var.h)" ); |
189 | |
190 | SYSCTL_INT(_net_inet_udp, OID_AUTO, pcbcount, |
191 | CTLFLAG_RD | CTLFLAG_LOCKED, &udbinfo.ipi_count, 0, |
192 | "Number of active PCBs" ); |
193 | |
194 | __private_extern__ int udp_use_randomport = 1; |
195 | SYSCTL_INT(_net_inet_udp, OID_AUTO, randomize_ports, |
196 | CTLFLAG_RW | CTLFLAG_LOCKED, &udp_use_randomport, 0, |
197 | "Randomize UDP port numbers" ); |
198 | |
199 | #if INET6 |
200 | struct udp_in6 { |
201 | struct sockaddr_in6 uin6_sin; |
202 | u_char uin6_init_done : 1; |
203 | }; |
204 | struct udp_ip6 { |
205 | struct ip6_hdr uip6_ip6; |
206 | u_char uip6_init_done : 1; |
207 | }; |
208 | |
209 | int udp_abort(struct socket *); |
210 | int udp_attach(struct socket *, int, struct proc *); |
211 | int udp_bind(struct socket *, struct sockaddr *, struct proc *); |
212 | int udp_connect(struct socket *, struct sockaddr *, struct proc *); |
213 | int udp_connectx(struct socket *, struct sockaddr *, |
214 | struct sockaddr *, struct proc *, uint32_t, sae_associd_t, |
215 | sae_connid_t *, uint32_t, void *, uint32_t, struct uio *, user_ssize_t *); |
216 | int udp_detach(struct socket *); |
217 | int udp_disconnect(struct socket *); |
218 | int udp_disconnectx(struct socket *, sae_associd_t, sae_connid_t); |
219 | int udp_send(struct socket *, int, struct mbuf *, struct sockaddr *, |
220 | struct mbuf *, struct proc *); |
221 | static void udp_append(struct inpcb *, struct ip *, struct mbuf *, int, |
222 | struct sockaddr_in *, struct udp_in6 *, struct udp_ip6 *, struct ifnet *); |
223 | #else /* !INET6 */ |
224 | static void udp_append(struct inpcb *, struct ip *, struct mbuf *, int, |
225 | struct sockaddr_in *, struct ifnet *); |
226 | #endif /* !INET6 */ |
227 | static int udp_input_checksum(struct mbuf *, struct udphdr *, int, int); |
228 | int udp_output(struct inpcb *, struct mbuf *, struct sockaddr *, |
229 | struct mbuf *, struct proc *); |
230 | static void ip_2_ip6_hdr(struct ip6_hdr *ip6, struct ip *ip); |
231 | static void udp_gc(struct inpcbinfo *); |
232 | |
233 | struct pr_usrreqs udp_usrreqs = { |
234 | .pru_abort = udp_abort, |
235 | .pru_attach = udp_attach, |
236 | .pru_bind = udp_bind, |
237 | .pru_connect = udp_connect, |
238 | .pru_connectx = udp_connectx, |
239 | .pru_control = in_control, |
240 | .pru_detach = udp_detach, |
241 | .pru_disconnect = udp_disconnect, |
242 | .pru_disconnectx = udp_disconnectx, |
243 | .pru_peeraddr = in_getpeeraddr, |
244 | .pru_send = udp_send, |
245 | .pru_shutdown = udp_shutdown, |
246 | .pru_sockaddr = in_getsockaddr, |
247 | .pru_sosend = sosend, |
248 | .pru_soreceive = soreceive, |
249 | .pru_soreceive_list = soreceive_list, |
250 | }; |
251 | |
252 | void |
253 | udp_init(struct protosw *pp, struct domain *dp) |
254 | { |
255 | #pragma unused(dp) |
256 | static int udp_initialized = 0; |
257 | vm_size_t str_size; |
258 | struct inpcbinfo *pcbinfo; |
259 | |
260 | VERIFY((pp->pr_flags & (PR_INITIALIZED|PR_ATTACHED)) == PR_ATTACHED); |
261 | |
262 | if (udp_initialized) |
263 | return; |
264 | udp_initialized = 1; |
265 | uint32_t pool_size = (nmbclusters << MCLSHIFT) >> MBSHIFT; |
266 | if (pool_size >= 96) { |
267 | /* Improves 10GbE UDP performance. */ |
268 | udp_recvspace = 786896; |
269 | } |
270 | LIST_INIT(&udb); |
271 | udbinfo.ipi_listhead = &udb; |
272 | udbinfo.ipi_hashbase = hashinit(UDBHASHSIZE, M_PCB, |
273 | &udbinfo.ipi_hashmask); |
274 | udbinfo.ipi_porthashbase = hashinit(UDBHASHSIZE, M_PCB, |
275 | &udbinfo.ipi_porthashmask); |
276 | str_size = (vm_size_t) sizeof (struct inpcb); |
277 | udbinfo.ipi_zone = zinit(str_size, 80000*str_size, 8192, "udpcb" ); |
278 | |
279 | pcbinfo = &udbinfo; |
280 | /* |
281 | * allocate lock group attribute and group for udp pcb mutexes |
282 | */ |
283 | pcbinfo->ipi_lock_grp_attr = lck_grp_attr_alloc_init(); |
284 | pcbinfo->ipi_lock_grp = lck_grp_alloc_init("udppcb" , |
285 | pcbinfo->ipi_lock_grp_attr); |
286 | pcbinfo->ipi_lock_attr = lck_attr_alloc_init(); |
287 | if ((pcbinfo->ipi_lock = lck_rw_alloc_init(pcbinfo->ipi_lock_grp, |
288 | pcbinfo->ipi_lock_attr)) == NULL) { |
289 | panic("%s: unable to allocate PCB lock\n" , __func__); |
290 | /* NOTREACHED */ |
291 | } |
292 | |
293 | udbinfo.ipi_gc = udp_gc; |
294 | in_pcbinfo_attach(&udbinfo); |
295 | } |
296 | |
297 | void |
298 | udp_input(struct mbuf *m, int iphlen) |
299 | { |
300 | struct ip *ip; |
301 | struct udphdr *uh; |
302 | struct inpcb *inp; |
303 | struct mbuf *opts = NULL; |
304 | int len, isbroadcast; |
305 | struct ip save_ip; |
306 | struct sockaddr *append_sa; |
307 | struct inpcbinfo *pcbinfo = &udbinfo; |
308 | struct sockaddr_in udp_in; |
309 | struct ip_moptions *imo = NULL; |
310 | int foundmembership = 0, ret = 0; |
311 | #if INET6 |
312 | struct udp_in6 udp_in6; |
313 | struct udp_ip6 udp_ip6; |
314 | #endif /* INET6 */ |
315 | struct ifnet *ifp = m->m_pkthdr.rcvif; |
316 | boolean_t cell = IFNET_IS_CELLULAR(ifp); |
317 | boolean_t wifi = (!cell && IFNET_IS_WIFI(ifp)); |
318 | boolean_t wired = (!wifi && IFNET_IS_WIRED(ifp)); |
319 | |
320 | bzero(&udp_in, sizeof (udp_in)); |
321 | udp_in.sin_len = sizeof (struct sockaddr_in); |
322 | udp_in.sin_family = AF_INET; |
323 | #if INET6 |
324 | bzero(&udp_in6, sizeof (udp_in6)); |
325 | udp_in6.uin6_sin.sin6_len = sizeof (struct sockaddr_in6); |
326 | udp_in6.uin6_sin.sin6_family = AF_INET6; |
327 | #endif /* INET6 */ |
328 | |
329 | udpstat.udps_ipackets++; |
330 | |
331 | KERNEL_DEBUG(DBG_FNC_UDP_INPUT | DBG_FUNC_START, 0, 0, 0, 0, 0); |
332 | |
333 | /* Expect 32-bit aligned data pointer on strict-align platforms */ |
334 | MBUF_STRICT_DATA_ALIGNMENT_CHECK_32(m); |
335 | |
336 | /* |
337 | * Strip IP options, if any; should skip this, |
338 | * make available to user, and use on returned packets, |
339 | * but we don't yet have a way to check the checksum |
340 | * with options still present. |
341 | */ |
342 | if (iphlen > sizeof (struct ip)) { |
343 | ip_stripoptions(m); |
344 | iphlen = sizeof (struct ip); |
345 | } |
346 | |
347 | /* |
348 | * Get IP and UDP header together in first mbuf. |
349 | */ |
350 | ip = mtod(m, struct ip *); |
351 | if (m->m_len < iphlen + sizeof (struct udphdr)) { |
352 | m = m_pullup(m, iphlen + sizeof (struct udphdr)); |
353 | if (m == NULL) { |
354 | udpstat.udps_hdrops++; |
355 | KERNEL_DEBUG(DBG_FNC_UDP_INPUT | DBG_FUNC_END, |
356 | 0, 0, 0, 0, 0); |
357 | return; |
358 | } |
359 | ip = mtod(m, struct ip *); |
360 | } |
361 | uh = (struct udphdr *)(void *)((caddr_t)ip + iphlen); |
362 | |
363 | /* destination port of 0 is illegal, based on RFC768. */ |
364 | if (uh->uh_dport == 0) { |
365 | IF_UDP_STATINC(ifp, port0); |
366 | goto bad; |
367 | } |
368 | |
369 | KERNEL_DEBUG(DBG_LAYER_IN_BEG, uh->uh_dport, uh->uh_sport, |
370 | ip->ip_src.s_addr, ip->ip_dst.s_addr, uh->uh_ulen); |
371 | |
372 | /* |
373 | * Make mbuf data length reflect UDP length. |
374 | * If not enough data to reflect UDP length, drop. |
375 | */ |
376 | len = ntohs((u_short)uh->uh_ulen); |
377 | if (ip->ip_len != len) { |
378 | if (len > ip->ip_len || len < sizeof (struct udphdr)) { |
379 | udpstat.udps_badlen++; |
380 | IF_UDP_STATINC(ifp, badlength); |
381 | goto bad; |
382 | } |
383 | m_adj(m, len - ip->ip_len); |
384 | /* ip->ip_len = len; */ |
385 | } |
386 | /* |
387 | * Save a copy of the IP header in case we want restore it |
388 | * for sending an ICMP error message in response. |
389 | */ |
390 | save_ip = *ip; |
391 | |
392 | /* |
393 | * Checksum extended UDP header and data. |
394 | */ |
395 | if (udp_input_checksum(m, uh, iphlen, len)) |
396 | goto bad; |
397 | |
398 | isbroadcast = in_broadcast(ip->ip_dst, ifp); |
399 | |
400 | if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) || isbroadcast) { |
401 | int reuse_sock = 0, mcast_delivered = 0; |
402 | |
403 | lck_rw_lock_shared(pcbinfo->ipi_lock); |
404 | /* |
405 | * Deliver a multicast or broadcast datagram to *all* sockets |
406 | * for which the local and remote addresses and ports match |
407 | * those of the incoming datagram. This allows more than |
408 | * one process to receive multi/broadcasts on the same port. |
409 | * (This really ought to be done for unicast datagrams as |
410 | * well, but that would cause problems with existing |
411 | * applications that open both address-specific sockets and |
412 | * a wildcard socket listening to the same port -- they would |
413 | * end up receiving duplicates of every unicast datagram. |
414 | * Those applications open the multiple sockets to overcome an |
415 | * inadequacy of the UDP socket interface, but for backwards |
416 | * compatibility we avoid the problem here rather than |
417 | * fixing the interface. Maybe 4.5BSD will remedy this?) |
418 | */ |
419 | |
420 | /* |
421 | * Construct sockaddr format source address. |
422 | */ |
423 | udp_in.sin_port = uh->uh_sport; |
424 | udp_in.sin_addr = ip->ip_src; |
425 | /* |
426 | * Locate pcb(s) for datagram. |
427 | * (Algorithm copied from raw_intr().) |
428 | */ |
429 | #if INET6 |
430 | udp_in6.uin6_init_done = udp_ip6.uip6_init_done = 0; |
431 | #endif /* INET6 */ |
432 | LIST_FOREACH(inp, &udb, inp_list) { |
433 | #if IPSEC |
434 | int skipit; |
435 | #endif /* IPSEC */ |
436 | |
437 | if (inp->inp_socket == NULL) |
438 | continue; |
439 | if (inp != sotoinpcb(inp->inp_socket)) { |
440 | panic("%s: bad so back ptr inp=%p\n" , |
441 | __func__, inp); |
442 | /* NOTREACHED */ |
443 | } |
444 | #if INET6 |
445 | if ((inp->inp_vflag & INP_IPV4) == 0) |
446 | continue; |
447 | #endif /* INET6 */ |
448 | if (inp_restricted_recv(inp, ifp)) |
449 | continue; |
450 | |
451 | if ((inp->inp_moptions == NULL) && |
452 | (ntohl(ip->ip_dst.s_addr) != |
453 | INADDR_ALLHOSTS_GROUP) && (isbroadcast == 0)) |
454 | continue; |
455 | |
456 | if (in_pcb_checkstate(inp, WNT_ACQUIRE, 0) == |
457 | WNT_STOPUSING) |
458 | continue; |
459 | |
460 | udp_lock(inp->inp_socket, 1, 0); |
461 | |
462 | if (in_pcb_checkstate(inp, WNT_RELEASE, 1) == |
463 | WNT_STOPUSING) { |
464 | udp_unlock(inp->inp_socket, 1, 0); |
465 | continue; |
466 | } |
467 | |
468 | if (inp->inp_lport != uh->uh_dport) { |
469 | udp_unlock(inp->inp_socket, 1, 0); |
470 | continue; |
471 | } |
472 | if (inp->inp_laddr.s_addr != INADDR_ANY) { |
473 | if (inp->inp_laddr.s_addr != |
474 | ip->ip_dst.s_addr) { |
475 | udp_unlock(inp->inp_socket, 1, 0); |
476 | continue; |
477 | } |
478 | } |
479 | if (inp->inp_faddr.s_addr != INADDR_ANY) { |
480 | if (inp->inp_faddr.s_addr != |
481 | ip->ip_src.s_addr || |
482 | inp->inp_fport != uh->uh_sport) { |
483 | udp_unlock(inp->inp_socket, 1, 0); |
484 | continue; |
485 | } |
486 | } |
487 | |
488 | if (isbroadcast == 0 && (ntohl(ip->ip_dst.s_addr) != |
489 | INADDR_ALLHOSTS_GROUP)) { |
490 | struct sockaddr_in group; |
491 | int blocked; |
492 | |
493 | if ((imo = inp->inp_moptions) == NULL) { |
494 | udp_unlock(inp->inp_socket, 1, 0); |
495 | continue; |
496 | } |
497 | IMO_LOCK(imo); |
498 | |
499 | bzero(&group, sizeof (struct sockaddr_in)); |
500 | group.sin_len = sizeof (struct sockaddr_in); |
501 | group.sin_family = AF_INET; |
502 | group.sin_addr = ip->ip_dst; |
503 | |
504 | blocked = imo_multi_filter(imo, ifp, |
505 | &group, &udp_in); |
506 | if (blocked == MCAST_PASS) |
507 | foundmembership = 1; |
508 | |
509 | IMO_UNLOCK(imo); |
510 | if (!foundmembership) { |
511 | udp_unlock(inp->inp_socket, 1, 0); |
512 | if (blocked == MCAST_NOTSMEMBER || |
513 | blocked == MCAST_MUTED) |
514 | udpstat.udps_filtermcast++; |
515 | continue; |
516 | } |
517 | foundmembership = 0; |
518 | } |
519 | |
520 | reuse_sock = (inp->inp_socket->so_options & |
521 | (SO_REUSEPORT|SO_REUSEADDR)); |
522 | |
523 | #if NECP |
524 | skipit = 0; |
525 | if (!necp_socket_is_allowed_to_send_recv_v4(inp, |
526 | uh->uh_dport, uh->uh_sport, &ip->ip_dst, |
527 | &ip->ip_src, ifp, NULL, NULL, NULL)) { |
528 | /* do not inject data to pcb */ |
529 | skipit = 1; |
530 | } |
531 | if (skipit == 0) |
532 | #endif /* NECP */ |
533 | { |
534 | struct mbuf *n = NULL; |
535 | |
536 | if (reuse_sock) |
537 | n = m_copy(m, 0, M_COPYALL); |
538 | #if INET6 |
539 | udp_append(inp, ip, m, |
540 | iphlen + sizeof (struct udphdr), |
541 | &udp_in, &udp_in6, &udp_ip6, ifp); |
542 | #else /* !INET6 */ |
543 | udp_append(inp, ip, m, |
544 | iphlen + sizeof (struct udphdr), |
545 | &udp_in, ifp); |
546 | #endif /* !INET6 */ |
547 | mcast_delivered++; |
548 | |
549 | m = n; |
550 | } |
551 | udp_unlock(inp->inp_socket, 1, 0); |
552 | |
553 | /* |
554 | * Don't look for additional matches if this one does |
555 | * not have either the SO_REUSEPORT or SO_REUSEADDR |
556 | * socket options set. This heuristic avoids searching |
557 | * through all pcbs in the common case of a non-shared |
558 | * port. It assumes that an application will never |
559 | * clear these options after setting them. |
560 | */ |
561 | if (reuse_sock == 0 || m == NULL) |
562 | break; |
563 | |
564 | /* |
565 | * Expect 32-bit aligned data pointer on strict-align |
566 | * platforms. |
567 | */ |
568 | MBUF_STRICT_DATA_ALIGNMENT_CHECK_32(m); |
569 | /* |
570 | * Recompute IP and UDP header pointers for new mbuf |
571 | */ |
572 | ip = mtod(m, struct ip *); |
573 | uh = (struct udphdr *)(void *)((caddr_t)ip + iphlen); |
574 | } |
575 | lck_rw_done(pcbinfo->ipi_lock); |
576 | |
577 | if (mcast_delivered == 0) { |
578 | /* |
579 | * No matching pcb found; discard datagram. |
580 | * (No need to send an ICMP Port Unreachable |
581 | * for a broadcast or multicast datgram.) |
582 | */ |
583 | udpstat.udps_noportbcast++; |
584 | IF_UDP_STATINC(ifp, port_unreach); |
585 | goto bad; |
586 | } |
587 | |
588 | /* free the extra copy of mbuf or skipped by IPSec */ |
589 | if (m != NULL) |
590 | m_freem(m); |
591 | KERNEL_DEBUG(DBG_FNC_UDP_INPUT | DBG_FUNC_END, 0, 0, 0, 0, 0); |
592 | return; |
593 | } |
594 | |
595 | #if IPSEC |
596 | /* |
597 | * UDP to port 4500 with a payload where the first four bytes are |
598 | * not zero is a UDP encapsulated IPSec packet. Packets where |
599 | * the payload is one byte and that byte is 0xFF are NAT keepalive |
600 | * packets. Decapsulate the ESP packet and carry on with IPSec input |
601 | * or discard the NAT keep-alive. |
602 | */ |
603 | if (ipsec_bypass == 0 && (esp_udp_encap_port & 0xFFFF) != 0 && |
604 | uh->uh_dport == ntohs((u_short)esp_udp_encap_port)) { |
605 | int payload_len = len - sizeof (struct udphdr) > 4 ? 4 : |
606 | len - sizeof (struct udphdr); |
607 | |
608 | if (m->m_len < iphlen + sizeof (struct udphdr) + payload_len) { |
609 | if ((m = m_pullup(m, iphlen + sizeof (struct udphdr) + |
610 | payload_len)) == NULL) { |
611 | udpstat.udps_hdrops++; |
612 | KERNEL_DEBUG(DBG_FNC_UDP_INPUT | DBG_FUNC_END, |
613 | 0, 0, 0, 0, 0); |
614 | return; |
615 | } |
616 | /* |
617 | * Expect 32-bit aligned data pointer on strict-align |
618 | * platforms. |
619 | */ |
620 | MBUF_STRICT_DATA_ALIGNMENT_CHECK_32(m); |
621 | |
622 | ip = mtod(m, struct ip *); |
623 | uh = (struct udphdr *)(void *)((caddr_t)ip + iphlen); |
624 | } |
625 | /* Check for NAT keepalive packet */ |
626 | if (payload_len == 1 && *(u_int8_t *) |
627 | ((caddr_t)uh + sizeof (struct udphdr)) == 0xFF) { |
628 | m_freem(m); |
629 | KERNEL_DEBUG(DBG_FNC_UDP_INPUT | DBG_FUNC_END, |
630 | 0, 0, 0, 0, 0); |
631 | return; |
632 | } else if (payload_len == 4 && *(u_int32_t *)(void *) |
633 | ((caddr_t)uh + sizeof (struct udphdr)) != 0) { |
634 | /* UDP encapsulated IPSec packet to pass through NAT */ |
635 | KERNEL_DEBUG(DBG_FNC_UDP_INPUT | DBG_FUNC_END, |
636 | 0, 0, 0, 0, 0); |
637 | /* preserve the udp header */ |
638 | esp4_input(m, iphlen + sizeof (struct udphdr)); |
639 | return; |
640 | } |
641 | } |
642 | #endif /* IPSEC */ |
643 | |
644 | /* |
645 | * Locate pcb for datagram. |
646 | */ |
647 | inp = in_pcblookup_hash(&udbinfo, ip->ip_src, uh->uh_sport, |
648 | ip->ip_dst, uh->uh_dport, 1, ifp); |
649 | if (inp == NULL) { |
650 | IF_UDP_STATINC(ifp, port_unreach); |
651 | |
652 | if (udp_log_in_vain) { |
653 | char buf[MAX_IPv4_STR_LEN]; |
654 | char buf2[MAX_IPv4_STR_LEN]; |
655 | |
656 | /* check src and dst address */ |
657 | if (udp_log_in_vain < 3) { |
658 | log(LOG_INFO, "Connection attempt to " |
659 | "UDP %s:%d from %s:%d\n" , inet_ntop(AF_INET, |
660 | &ip->ip_dst, buf, sizeof (buf)), |
661 | ntohs(uh->uh_dport), inet_ntop(AF_INET, |
662 | &ip->ip_src, buf2, sizeof (buf2)), |
663 | ntohs(uh->uh_sport)); |
664 | } else if (!(m->m_flags & (M_BCAST | M_MCAST)) && |
665 | ip->ip_dst.s_addr != ip->ip_src.s_addr) { |
666 | log_in_vain_log((LOG_INFO, |
667 | "Stealth Mode connection attempt to " |
668 | "UDP %s:%d from %s:%d\n" , inet_ntop(AF_INET, |
669 | &ip->ip_dst, buf, sizeof (buf)), |
670 | ntohs(uh->uh_dport), inet_ntop(AF_INET, |
671 | &ip->ip_src, buf2, sizeof (buf2)), |
672 | ntohs(uh->uh_sport))) |
673 | } |
674 | } |
675 | udpstat.udps_noport++; |
676 | if (m->m_flags & (M_BCAST | M_MCAST)) { |
677 | udpstat.udps_noportbcast++; |
678 | goto bad; |
679 | } |
680 | #if ICMP_BANDLIM |
681 | if (badport_bandlim(BANDLIM_ICMP_UNREACH) < 0) |
682 | goto bad; |
683 | #endif /* ICMP_BANDLIM */ |
684 | if (blackhole) |
685 | if (ifp && ifp->if_type != IFT_LOOP) |
686 | goto bad; |
687 | *ip = save_ip; |
688 | ip->ip_len += iphlen; |
689 | icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0); |
690 | KERNEL_DEBUG(DBG_FNC_UDP_INPUT | DBG_FUNC_END, 0, 0, 0, 0, 0); |
691 | return; |
692 | } |
693 | udp_lock(inp->inp_socket, 1, 0); |
694 | |
695 | if (in_pcb_checkstate(inp, WNT_RELEASE, 1) == WNT_STOPUSING) { |
696 | udp_unlock(inp->inp_socket, 1, 0); |
697 | IF_UDP_STATINC(ifp, cleanup); |
698 | goto bad; |
699 | } |
700 | #if NECP |
701 | if (!necp_socket_is_allowed_to_send_recv_v4(inp, uh->uh_dport, |
702 | uh->uh_sport, &ip->ip_dst, &ip->ip_src, ifp, NULL, NULL, NULL)) { |
703 | udp_unlock(inp->inp_socket, 1, 0); |
704 | IF_UDP_STATINC(ifp, badipsec); |
705 | goto bad; |
706 | } |
707 | #endif /* NECP */ |
708 | |
709 | /* |
710 | * Construct sockaddr format source address. |
711 | * Stuff source address and datagram in user buffer. |
712 | */ |
713 | udp_in.sin_port = uh->uh_sport; |
714 | udp_in.sin_addr = ip->ip_src; |
715 | if ((inp->inp_flags & INP_CONTROLOPTS) != 0 || |
716 | (inp->inp_socket->so_options & SO_TIMESTAMP) != 0 || |
717 | (inp->inp_socket->so_options & SO_TIMESTAMP_MONOTONIC) != 0 || |
718 | (inp->inp_socket->so_options & SO_TIMESTAMP_CONTINUOUS) != 0) { |
719 | #if INET6 |
720 | if (inp->inp_vflag & INP_IPV6) { |
721 | int savedflags; |
722 | |
723 | ip_2_ip6_hdr(&udp_ip6.uip6_ip6, ip); |
724 | savedflags = inp->inp_flags; |
725 | inp->inp_flags &= ~INP_UNMAPPABLEOPTS; |
726 | ret = ip6_savecontrol(inp, m, &opts); |
727 | inp->inp_flags = savedflags; |
728 | } else |
729 | #endif /* INET6 */ |
730 | { |
731 | ret = ip_savecontrol(inp, &opts, ip, m); |
732 | } |
733 | if (ret != 0) { |
734 | udp_unlock(inp->inp_socket, 1, 0); |
735 | goto bad; |
736 | } |
737 | } |
738 | m_adj(m, iphlen + sizeof (struct udphdr)); |
739 | |
740 | KERNEL_DEBUG(DBG_LAYER_IN_END, uh->uh_dport, uh->uh_sport, |
741 | save_ip.ip_src.s_addr, save_ip.ip_dst.s_addr, uh->uh_ulen); |
742 | |
743 | #if INET6 |
744 | if (inp->inp_vflag & INP_IPV6) { |
745 | in6_sin_2_v4mapsin6(&udp_in, &udp_in6.uin6_sin); |
746 | append_sa = (struct sockaddr *)&udp_in6.uin6_sin; |
747 | } else |
748 | #endif /* INET6 */ |
749 | { |
750 | append_sa = (struct sockaddr *)&udp_in; |
751 | } |
752 | if (nstat_collect) { |
753 | INP_ADD_STAT(inp, cell, wifi, wired, rxpackets, 1); |
754 | INP_ADD_STAT(inp, cell, wifi, wired, rxbytes, m->m_pkthdr.len); |
755 | inp_set_activity_bitmap(inp); |
756 | } |
757 | so_recv_data_stat(inp->inp_socket, m, 0); |
758 | if (sbappendaddr(&inp->inp_socket->so_rcv, append_sa, |
759 | m, opts, NULL) == 0) { |
760 | udpstat.udps_fullsock++; |
761 | } else { |
762 | sorwakeup(inp->inp_socket); |
763 | } |
764 | udp_unlock(inp->inp_socket, 1, 0); |
765 | KERNEL_DEBUG(DBG_FNC_UDP_INPUT | DBG_FUNC_END, 0, 0, 0, 0, 0); |
766 | return; |
767 | bad: |
768 | m_freem(m); |
769 | if (opts) |
770 | m_freem(opts); |
771 | KERNEL_DEBUG(DBG_FNC_UDP_INPUT | DBG_FUNC_END, 0, 0, 0, 0, 0); |
772 | } |
773 | |
774 | #if INET6 |
775 | static void |
776 | ip_2_ip6_hdr(struct ip6_hdr *ip6, struct ip *ip) |
777 | { |
778 | bzero(ip6, sizeof (*ip6)); |
779 | |
780 | ip6->ip6_vfc = IPV6_VERSION; |
781 | ip6->ip6_plen = ip->ip_len; |
782 | ip6->ip6_nxt = ip->ip_p; |
783 | ip6->ip6_hlim = ip->ip_ttl; |
784 | if (ip->ip_src.s_addr) { |
785 | ip6->ip6_src.s6_addr32[2] = IPV6_ADDR_INT32_SMP; |
786 | ip6->ip6_src.s6_addr32[3] = ip->ip_src.s_addr; |
787 | } |
788 | if (ip->ip_dst.s_addr) { |
789 | ip6->ip6_dst.s6_addr32[2] = IPV6_ADDR_INT32_SMP; |
790 | ip6->ip6_dst.s6_addr32[3] = ip->ip_dst.s_addr; |
791 | } |
792 | } |
793 | #endif /* INET6 */ |
794 | |
795 | /* |
796 | * subroutine of udp_input(), mainly for source code readability. |
797 | */ |
798 | static void |
799 | #if INET6 |
800 | udp_append(struct inpcb *last, struct ip *ip, struct mbuf *n, int off, |
801 | struct sockaddr_in *pudp_in, struct udp_in6 *pudp_in6, |
802 | struct udp_ip6 *pudp_ip6, struct ifnet *ifp) |
803 | #else /* !INET6 */ |
804 | udp_append(struct inpcb *last, struct ip *ip, struct mbuf *n, int off, |
805 | struct sockaddr_in *pudp_in, struct ifnet *ifp) |
806 | #endif /* !INET6 */ |
807 | { |
808 | struct sockaddr *append_sa; |
809 | struct mbuf *opts = 0; |
810 | boolean_t cell = IFNET_IS_CELLULAR(ifp); |
811 | boolean_t wifi = (!cell && IFNET_IS_WIFI(ifp)); |
812 | boolean_t wired = (!wifi && IFNET_IS_WIRED(ifp)); |
813 | int ret = 0; |
814 | |
815 | #if CONFIG_MACF_NET |
816 | if (mac_inpcb_check_deliver(last, n, AF_INET, SOCK_DGRAM) != 0) { |
817 | m_freem(n); |
818 | return; |
819 | } |
820 | #endif /* CONFIG_MACF_NET */ |
821 | if ((last->inp_flags & INP_CONTROLOPTS) != 0 || |
822 | (last->inp_socket->so_options & SO_TIMESTAMP) != 0 || |
823 | (last->inp_socket->so_options & SO_TIMESTAMP_MONOTONIC) != 0 || |
824 | (last->inp_socket->so_options & SO_TIMESTAMP_CONTINUOUS) != 0) { |
825 | #if INET6 |
826 | if (last->inp_vflag & INP_IPV6) { |
827 | int savedflags; |
828 | |
829 | if (pudp_ip6->uip6_init_done == 0) { |
830 | ip_2_ip6_hdr(&pudp_ip6->uip6_ip6, ip); |
831 | pudp_ip6->uip6_init_done = 1; |
832 | } |
833 | savedflags = last->inp_flags; |
834 | last->inp_flags &= ~INP_UNMAPPABLEOPTS; |
835 | ret = ip6_savecontrol(last, n, &opts); |
836 | if (ret != 0) { |
837 | last->inp_flags = savedflags; |
838 | goto error; |
839 | } |
840 | last->inp_flags = savedflags; |
841 | } else |
842 | #endif /* INET6 */ |
843 | { |
844 | ret = ip_savecontrol(last, &opts, ip, n); |
845 | if (ret != 0) { |
846 | goto error; |
847 | } |
848 | } |
849 | } |
850 | #if INET6 |
851 | if (last->inp_vflag & INP_IPV6) { |
852 | if (pudp_in6->uin6_init_done == 0) { |
853 | in6_sin_2_v4mapsin6(pudp_in, &pudp_in6->uin6_sin); |
854 | pudp_in6->uin6_init_done = 1; |
855 | } |
856 | append_sa = (struct sockaddr *)&pudp_in6->uin6_sin; |
857 | } else |
858 | #endif /* INET6 */ |
859 | append_sa = (struct sockaddr *)pudp_in; |
860 | if (nstat_collect) { |
861 | INP_ADD_STAT(last, cell, wifi, wired, rxpackets, 1); |
862 | INP_ADD_STAT(last, cell, wifi, wired, rxbytes, |
863 | n->m_pkthdr.len); |
864 | inp_set_activity_bitmap(last); |
865 | } |
866 | so_recv_data_stat(last->inp_socket, n, 0); |
867 | m_adj(n, off); |
868 | if (sbappendaddr(&last->inp_socket->so_rcv, append_sa, |
869 | n, opts, NULL) == 0) { |
870 | udpstat.udps_fullsock++; |
871 | } else { |
872 | sorwakeup(last->inp_socket); |
873 | } |
874 | return; |
875 | error: |
876 | m_freem(n); |
877 | m_freem(opts); |
878 | } |
879 | |
880 | /* |
881 | * Notify a udp user of an asynchronous error; |
882 | * just wake up so that he can collect error status. |
883 | */ |
884 | void |
885 | udp_notify(struct inpcb *inp, int errno) |
886 | { |
887 | inp->inp_socket->so_error = errno; |
888 | sorwakeup(inp->inp_socket); |
889 | sowwakeup(inp->inp_socket); |
890 | } |
891 | |
892 | void |
893 | udp_ctlinput(int cmd, struct sockaddr *sa, void *vip, __unused struct ifnet * ifp) |
894 | { |
895 | struct ip *ip = vip; |
896 | void (*notify)(struct inpcb *, int) = udp_notify; |
897 | struct in_addr faddr; |
898 | struct inpcb *inp = NULL; |
899 | |
900 | faddr = ((struct sockaddr_in *)(void *)sa)->sin_addr; |
901 | if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY) |
902 | return; |
903 | |
904 | if (PRC_IS_REDIRECT(cmd)) { |
905 | ip = 0; |
906 | notify = in_rtchange; |
907 | } else if (cmd == PRC_HOSTDEAD) { |
908 | ip = 0; |
909 | } else if ((unsigned)cmd >= PRC_NCMDS || inetctlerrmap[cmd] == 0) { |
910 | return; |
911 | } |
912 | if (ip) { |
913 | struct udphdr uh; |
914 | |
915 | bcopy(((caddr_t)ip + (ip->ip_hl << 2)), &uh, sizeof (uh)); |
916 | inp = in_pcblookup_hash(&udbinfo, faddr, uh.uh_dport, |
917 | ip->ip_src, uh.uh_sport, 0, NULL); |
918 | if (inp != NULL && inp->inp_socket != NULL) { |
919 | udp_lock(inp->inp_socket, 1, 0); |
920 | if (in_pcb_checkstate(inp, WNT_RELEASE, 1) == |
921 | WNT_STOPUSING) { |
922 | udp_unlock(inp->inp_socket, 1, 0); |
923 | return; |
924 | } |
925 | (*notify)(inp, inetctlerrmap[cmd]); |
926 | udp_unlock(inp->inp_socket, 1, 0); |
927 | } |
928 | } else { |
929 | in_pcbnotifyall(&udbinfo, faddr, inetctlerrmap[cmd], notify); |
930 | } |
931 | } |
932 | |
933 | int |
934 | udp_ctloutput(struct socket *so, struct sockopt *sopt) |
935 | { |
936 | int error = 0, optval = 0; |
937 | struct inpcb *inp; |
938 | |
939 | /* Allow <SOL_SOCKET,SO_FLUSH> at this level */ |
940 | if (sopt->sopt_level != IPPROTO_UDP && |
941 | !(sopt->sopt_level == SOL_SOCKET && sopt->sopt_name == SO_FLUSH)) |
942 | return (ip_ctloutput(so, sopt)); |
943 | |
944 | inp = sotoinpcb(so); |
945 | |
946 | switch (sopt->sopt_dir) { |
947 | case SOPT_SET: |
948 | switch (sopt->sopt_name) { |
949 | case UDP_NOCKSUM: |
950 | /* This option is settable only for UDP over IPv4 */ |
951 | if (!(inp->inp_vflag & INP_IPV4)) { |
952 | error = EINVAL; |
953 | break; |
954 | } |
955 | |
956 | if ((error = sooptcopyin(sopt, &optval, sizeof (optval), |
957 | sizeof (optval))) != 0) |
958 | break; |
959 | |
960 | if (optval != 0) |
961 | inp->inp_flags |= INP_UDP_NOCKSUM; |
962 | else |
963 | inp->inp_flags &= ~INP_UDP_NOCKSUM; |
964 | break; |
965 | case UDP_KEEPALIVE_OFFLOAD: |
966 | { |
967 | struct udp_keepalive_offload ka; |
968 | /* |
969 | * If the socket is not connected, the stack will |
970 | * not know the destination address to put in the |
971 | * keepalive datagram. Return an error now instead |
972 | * of failing later. |
973 | */ |
974 | if (!(so->so_state & SS_ISCONNECTED)) { |
975 | error = EINVAL; |
976 | break; |
977 | } |
978 | if (sopt->sopt_valsize != sizeof(ka)) { |
979 | error = EINVAL; |
980 | break; |
981 | } |
982 | if ((error = sooptcopyin(sopt, &ka, sizeof(ka), |
983 | sizeof(ka))) != 0) |
984 | break; |
985 | |
986 | /* application should specify the type */ |
987 | if (ka.ka_type == 0) |
988 | return (EINVAL); |
989 | |
990 | if (ka.ka_interval == 0) { |
991 | /* |
992 | * if interval is 0, disable the offload |
993 | * mechanism |
994 | */ |
995 | if (inp->inp_keepalive_data != NULL) |
996 | FREE(inp->inp_keepalive_data, |
997 | M_TEMP); |
998 | inp->inp_keepalive_data = NULL; |
999 | inp->inp_keepalive_datalen = 0; |
1000 | inp->inp_keepalive_interval = 0; |
1001 | inp->inp_keepalive_type = 0; |
1002 | inp->inp_flags2 &= ~INP2_KEEPALIVE_OFFLOAD; |
1003 | } else { |
1004 | if (inp->inp_keepalive_data != NULL) { |
1005 | FREE(inp->inp_keepalive_data, |
1006 | M_TEMP); |
1007 | inp->inp_keepalive_data = NULL; |
1008 | } |
1009 | |
1010 | inp->inp_keepalive_datalen = min( |
1011 | ka.ka_data_len, |
1012 | UDP_KEEPALIVE_OFFLOAD_DATA_SIZE); |
1013 | if (inp->inp_keepalive_datalen > 0) { |
1014 | MALLOC(inp->inp_keepalive_data, |
1015 | u_int8_t *, |
1016 | inp->inp_keepalive_datalen, |
1017 | M_TEMP, M_WAITOK); |
1018 | if (inp->inp_keepalive_data == NULL) { |
1019 | inp->inp_keepalive_datalen = 0; |
1020 | error = ENOMEM; |
1021 | break; |
1022 | } |
1023 | bcopy(ka.ka_data, |
1024 | inp->inp_keepalive_data, |
1025 | inp->inp_keepalive_datalen); |
1026 | } else { |
1027 | inp->inp_keepalive_datalen = 0; |
1028 | } |
1029 | inp->inp_keepalive_interval = |
1030 | min(UDP_KEEPALIVE_INTERVAL_MAX_SECONDS, |
1031 | ka.ka_interval); |
1032 | inp->inp_keepalive_type = ka.ka_type; |
1033 | inp->inp_flags2 |= INP2_KEEPALIVE_OFFLOAD; |
1034 | } |
1035 | break; |
1036 | } |
1037 | case SO_FLUSH: |
1038 | if ((error = sooptcopyin(sopt, &optval, sizeof (optval), |
1039 | sizeof (optval))) != 0) |
1040 | break; |
1041 | |
1042 | error = inp_flush(inp, optval); |
1043 | break; |
1044 | |
1045 | default: |
1046 | error = ENOPROTOOPT; |
1047 | break; |
1048 | } |
1049 | break; |
1050 | |
1051 | case SOPT_GET: |
1052 | switch (sopt->sopt_name) { |
1053 | case UDP_NOCKSUM: |
1054 | optval = inp->inp_flags & INP_UDP_NOCKSUM; |
1055 | break; |
1056 | |
1057 | default: |
1058 | error = ENOPROTOOPT; |
1059 | break; |
1060 | } |
1061 | if (error == 0) |
1062 | error = sooptcopyout(sopt, &optval, sizeof (optval)); |
1063 | break; |
1064 | } |
1065 | return (error); |
1066 | } |
1067 | |
1068 | static int |
1069 | udp_pcblist SYSCTL_HANDLER_ARGS |
1070 | { |
1071 | #pragma unused(oidp, arg1, arg2) |
1072 | int error, i, n; |
1073 | struct inpcb *inp, **inp_list; |
1074 | inp_gen_t gencnt; |
1075 | struct xinpgen xig; |
1076 | |
1077 | /* |
1078 | * The process of preparing the TCB list is too time-consuming and |
1079 | * resource-intensive to repeat twice on every request. |
1080 | */ |
1081 | lck_rw_lock_exclusive(udbinfo.ipi_lock); |
1082 | if (req->oldptr == USER_ADDR_NULL) { |
1083 | n = udbinfo.ipi_count; |
1084 | req->oldidx = 2 * (sizeof (xig)) |
1085 | + (n + n/8) * sizeof (struct xinpcb); |
1086 | lck_rw_done(udbinfo.ipi_lock); |
1087 | return (0); |
1088 | } |
1089 | |
1090 | if (req->newptr != USER_ADDR_NULL) { |
1091 | lck_rw_done(udbinfo.ipi_lock); |
1092 | return (EPERM); |
1093 | } |
1094 | |
1095 | /* |
1096 | * OK, now we're committed to doing something. |
1097 | */ |
1098 | gencnt = udbinfo.ipi_gencnt; |
1099 | n = udbinfo.ipi_count; |
1100 | |
1101 | bzero(&xig, sizeof (xig)); |
1102 | xig.xig_len = sizeof (xig); |
1103 | xig.xig_count = n; |
1104 | xig.xig_gen = gencnt; |
1105 | xig.xig_sogen = so_gencnt; |
1106 | error = SYSCTL_OUT(req, &xig, sizeof (xig)); |
1107 | if (error) { |
1108 | lck_rw_done(udbinfo.ipi_lock); |
1109 | return (error); |
1110 | } |
1111 | /* |
1112 | * We are done if there is no pcb |
1113 | */ |
1114 | if (n == 0) { |
1115 | lck_rw_done(udbinfo.ipi_lock); |
1116 | return (0); |
1117 | } |
1118 | |
1119 | inp_list = _MALLOC(n * sizeof (*inp_list), M_TEMP, M_WAITOK); |
1120 | if (inp_list == 0) { |
1121 | lck_rw_done(udbinfo.ipi_lock); |
1122 | return (ENOMEM); |
1123 | } |
1124 | |
1125 | for (inp = LIST_FIRST(udbinfo.ipi_listhead), i = 0; inp && i < n; |
1126 | inp = LIST_NEXT(inp, inp_list)) { |
1127 | if (inp->inp_gencnt <= gencnt && |
1128 | inp->inp_state != INPCB_STATE_DEAD) |
1129 | inp_list[i++] = inp; |
1130 | } |
1131 | n = i; |
1132 | |
1133 | error = 0; |
1134 | for (i = 0; i < n; i++) { |
1135 | struct xinpcb xi; |
1136 | |
1137 | inp = inp_list[i]; |
1138 | |
1139 | if (in_pcb_checkstate(inp, WNT_ACQUIRE, 0) == WNT_STOPUSING) |
1140 | continue; |
1141 | udp_lock(inp->inp_socket, 1, 0); |
1142 | if (in_pcb_checkstate(inp, WNT_RELEASE, 1) == WNT_STOPUSING) { |
1143 | udp_unlock(inp->inp_socket, 1, 0); |
1144 | continue; |
1145 | } |
1146 | if (inp->inp_gencnt > gencnt) { |
1147 | udp_unlock(inp->inp_socket, 1, 0); |
1148 | continue; |
1149 | } |
1150 | |
1151 | bzero(&xi, sizeof (xi)); |
1152 | xi.xi_len = sizeof (xi); |
1153 | /* XXX should avoid extra copy */ |
1154 | inpcb_to_compat(inp, &xi.xi_inp); |
1155 | if (inp->inp_socket) |
1156 | sotoxsocket(inp->inp_socket, &xi.xi_socket); |
1157 | |
1158 | udp_unlock(inp->inp_socket, 1, 0); |
1159 | |
1160 | error = SYSCTL_OUT(req, &xi, sizeof (xi)); |
1161 | } |
1162 | if (!error) { |
1163 | /* |
1164 | * Give the user an updated idea of our state. |
1165 | * If the generation differs from what we told |
1166 | * her before, she knows that something happened |
1167 | * while we were processing this request, and it |
1168 | * might be necessary to retry. |
1169 | */ |
1170 | bzero(&xig, sizeof (xig)); |
1171 | xig.xig_len = sizeof (xig); |
1172 | xig.xig_gen = udbinfo.ipi_gencnt; |
1173 | xig.xig_sogen = so_gencnt; |
1174 | xig.xig_count = udbinfo.ipi_count; |
1175 | error = SYSCTL_OUT(req, &xig, sizeof (xig)); |
1176 | } |
1177 | FREE(inp_list, M_TEMP); |
1178 | lck_rw_done(udbinfo.ipi_lock); |
1179 | return (error); |
1180 | } |
1181 | |
1182 | SYSCTL_PROC(_net_inet_udp, UDPCTL_PCBLIST, pcblist, |
1183 | CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_LOCKED, 0, 0, udp_pcblist, |
1184 | "S,xinpcb" , "List of active UDP sockets" ); |
1185 | |
1186 | #if !CONFIG_EMBEDDED |
1187 | |
1188 | static int |
1189 | udp_pcblist64 SYSCTL_HANDLER_ARGS |
1190 | { |
1191 | #pragma unused(oidp, arg1, arg2) |
1192 | int error, i, n; |
1193 | struct inpcb *inp, **inp_list; |
1194 | inp_gen_t gencnt; |
1195 | struct xinpgen xig; |
1196 | |
1197 | /* |
1198 | * The process of preparing the TCB list is too time-consuming and |
1199 | * resource-intensive to repeat twice on every request. |
1200 | */ |
1201 | lck_rw_lock_shared(udbinfo.ipi_lock); |
1202 | if (req->oldptr == USER_ADDR_NULL) { |
1203 | n = udbinfo.ipi_count; |
1204 | req->oldidx = |
1205 | 2 * (sizeof (xig)) + (n + n/8) * sizeof (struct xinpcb64); |
1206 | lck_rw_done(udbinfo.ipi_lock); |
1207 | return (0); |
1208 | } |
1209 | |
1210 | if (req->newptr != USER_ADDR_NULL) { |
1211 | lck_rw_done(udbinfo.ipi_lock); |
1212 | return (EPERM); |
1213 | } |
1214 | |
1215 | /* |
1216 | * OK, now we're committed to doing something. |
1217 | */ |
1218 | gencnt = udbinfo.ipi_gencnt; |
1219 | n = udbinfo.ipi_count; |
1220 | |
1221 | bzero(&xig, sizeof (xig)); |
1222 | xig.xig_len = sizeof (xig); |
1223 | xig.xig_count = n; |
1224 | xig.xig_gen = gencnt; |
1225 | xig.xig_sogen = so_gencnt; |
1226 | error = SYSCTL_OUT(req, &xig, sizeof (xig)); |
1227 | if (error) { |
1228 | lck_rw_done(udbinfo.ipi_lock); |
1229 | return (error); |
1230 | } |
1231 | /* |
1232 | * We are done if there is no pcb |
1233 | */ |
1234 | if (n == 0) { |
1235 | lck_rw_done(udbinfo.ipi_lock); |
1236 | return (0); |
1237 | } |
1238 | |
1239 | inp_list = _MALLOC(n * sizeof (*inp_list), M_TEMP, M_WAITOK); |
1240 | if (inp_list == 0) { |
1241 | lck_rw_done(udbinfo.ipi_lock); |
1242 | return (ENOMEM); |
1243 | } |
1244 | |
1245 | for (inp = LIST_FIRST(udbinfo.ipi_listhead), i = 0; inp && i < n; |
1246 | inp = LIST_NEXT(inp, inp_list)) { |
1247 | if (inp->inp_gencnt <= gencnt && |
1248 | inp->inp_state != INPCB_STATE_DEAD) |
1249 | inp_list[i++] = inp; |
1250 | } |
1251 | n = i; |
1252 | |
1253 | error = 0; |
1254 | for (i = 0; i < n; i++) { |
1255 | struct xinpcb64 xi; |
1256 | |
1257 | inp = inp_list[i]; |
1258 | |
1259 | if (in_pcb_checkstate(inp, WNT_ACQUIRE, 0) == WNT_STOPUSING) |
1260 | continue; |
1261 | udp_lock(inp->inp_socket, 1, 0); |
1262 | if (in_pcb_checkstate(inp, WNT_RELEASE, 1) == WNT_STOPUSING) { |
1263 | udp_unlock(inp->inp_socket, 1, 0); |
1264 | continue; |
1265 | } |
1266 | if (inp->inp_gencnt > gencnt) { |
1267 | udp_unlock(inp->inp_socket, 1, 0); |
1268 | continue; |
1269 | } |
1270 | |
1271 | bzero(&xi, sizeof (xi)); |
1272 | xi.xi_len = sizeof (xi); |
1273 | inpcb_to_xinpcb64(inp, &xi); |
1274 | if (inp->inp_socket) |
1275 | sotoxsocket64(inp->inp_socket, &xi.xi_socket); |
1276 | |
1277 | udp_unlock(inp->inp_socket, 1, 0); |
1278 | |
1279 | error = SYSCTL_OUT(req, &xi, sizeof (xi)); |
1280 | } |
1281 | if (!error) { |
1282 | /* |
1283 | * Give the user an updated idea of our state. |
1284 | * If the generation differs from what we told |
1285 | * her before, she knows that something happened |
1286 | * while we were processing this request, and it |
1287 | * might be necessary to retry. |
1288 | */ |
1289 | bzero(&xig, sizeof (xig)); |
1290 | xig.xig_len = sizeof (xig); |
1291 | xig.xig_gen = udbinfo.ipi_gencnt; |
1292 | xig.xig_sogen = so_gencnt; |
1293 | xig.xig_count = udbinfo.ipi_count; |
1294 | error = SYSCTL_OUT(req, &xig, sizeof (xig)); |
1295 | } |
1296 | FREE(inp_list, M_TEMP); |
1297 | lck_rw_done(udbinfo.ipi_lock); |
1298 | return (error); |
1299 | } |
1300 | |
1301 | SYSCTL_PROC(_net_inet_udp, OID_AUTO, pcblist64, |
1302 | CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_LOCKED, 0, 0, udp_pcblist64, |
1303 | "S,xinpcb64" , "List of active UDP sockets" ); |
1304 | |
1305 | #endif /* !CONFIG_EMBEDDED */ |
1306 | |
1307 | static int |
1308 | udp_pcblist_n SYSCTL_HANDLER_ARGS |
1309 | { |
1310 | #pragma unused(oidp, arg1, arg2) |
1311 | return (get_pcblist_n(IPPROTO_UDP, req, &udbinfo)); |
1312 | } |
1313 | |
1314 | SYSCTL_PROC(_net_inet_udp, OID_AUTO, pcblist_n, |
1315 | CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_LOCKED, 0, 0, udp_pcblist_n, |
1316 | "S,xinpcb_n" , "List of active UDP sockets" ); |
1317 | |
1318 | __private_extern__ void |
1319 | udp_get_ports_used(uint32_t ifindex, int protocol, uint32_t flags, |
1320 | bitstr_t *bitfield) |
1321 | { |
1322 | inpcb_get_ports_used(ifindex, protocol, flags, bitfield, |
1323 | &udbinfo); |
1324 | } |
1325 | |
1326 | __private_extern__ uint32_t |
1327 | udp_count_opportunistic(unsigned int ifindex, u_int32_t flags) |
1328 | { |
1329 | return (inpcb_count_opportunistic(ifindex, &udbinfo, flags)); |
1330 | } |
1331 | |
1332 | __private_extern__ uint32_t |
1333 | udp_find_anypcb_byaddr(struct ifaddr *ifa) |
1334 | { |
1335 | return (inpcb_find_anypcb_byaddr(ifa, &udbinfo)); |
1336 | } |
1337 | |
1338 | static int |
1339 | udp_check_pktinfo(struct mbuf *control, struct ifnet **outif, |
1340 | struct in_addr *laddr) |
1341 | { |
1342 | struct cmsghdr *cm = 0; |
1343 | struct in_pktinfo *pktinfo; |
1344 | struct ifnet *ifp; |
1345 | |
1346 | if (outif != NULL) |
1347 | *outif = NULL; |
1348 | |
1349 | /* |
1350 | * XXX: Currently, we assume all the optional information is stored |
1351 | * in a single mbuf. |
1352 | */ |
1353 | if (control->m_next) |
1354 | return (EINVAL); |
1355 | |
1356 | if (control->m_len < CMSG_LEN(0)) |
1357 | return (EINVAL); |
1358 | |
1359 | for (cm = M_FIRST_CMSGHDR(control); cm; |
1360 | cm = M_NXT_CMSGHDR(control, cm)) { |
1361 | if (cm->cmsg_len < sizeof (struct cmsghdr) || |
1362 | cm->cmsg_len > control->m_len) |
1363 | return (EINVAL); |
1364 | |
1365 | if (cm->cmsg_level != IPPROTO_IP || cm->cmsg_type != IP_PKTINFO) |
1366 | continue; |
1367 | |
1368 | if (cm->cmsg_len != CMSG_LEN(sizeof (struct in_pktinfo))) |
1369 | return (EINVAL); |
1370 | |
1371 | pktinfo = (struct in_pktinfo *)(void *)CMSG_DATA(cm); |
1372 | |
1373 | /* Check for a valid ifindex in pktinfo */ |
1374 | ifnet_head_lock_shared(); |
1375 | |
1376 | if (pktinfo->ipi_ifindex > if_index) { |
1377 | ifnet_head_done(); |
1378 | return (ENXIO); |
1379 | } |
1380 | |
1381 | /* |
1382 | * If ipi_ifindex is specified it takes precedence |
1383 | * over ipi_spec_dst. |
1384 | */ |
1385 | if (pktinfo->ipi_ifindex) { |
1386 | ifp = ifindex2ifnet[pktinfo->ipi_ifindex]; |
1387 | if (ifp == NULL) { |
1388 | ifnet_head_done(); |
1389 | return (ENXIO); |
1390 | } |
1391 | if (outif != NULL) { |
1392 | ifnet_reference(ifp); |
1393 | *outif = ifp; |
1394 | } |
1395 | ifnet_head_done(); |
1396 | laddr->s_addr = INADDR_ANY; |
1397 | break; |
1398 | } |
1399 | |
1400 | ifnet_head_done(); |
1401 | |
1402 | /* |
1403 | * Use the provided ipi_spec_dst address for temp |
1404 | * source address. |
1405 | */ |
1406 | *laddr = pktinfo->ipi_spec_dst; |
1407 | break; |
1408 | } |
1409 | return (0); |
1410 | } |
1411 | |
1412 | int |
1413 | udp_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *addr, |
1414 | struct mbuf *control, struct proc *p) |
1415 | { |
1416 | struct udpiphdr *ui; |
1417 | int len = m->m_pkthdr.len; |
1418 | struct sockaddr_in *sin; |
1419 | struct in_addr origladdr, laddr, faddr, pi_laddr; |
1420 | u_short lport, fport; |
1421 | int error = 0, udp_dodisconnect = 0, pktinfo = 0; |
1422 | struct socket *so = inp->inp_socket; |
1423 | int soopts = 0; |
1424 | struct mbuf *inpopts; |
1425 | struct ip_moptions *mopts; |
1426 | struct route ro; |
1427 | struct ip_out_args ipoa; |
1428 | #if CONTENT_FILTER |
1429 | struct m_tag *cfil_tag = NULL; |
1430 | bool cfil_faddr_use = false; |
1431 | uint32_t cfil_so_state_change_cnt = 0; |
1432 | short cfil_so_options = 0; |
1433 | struct sockaddr *cfil_faddr = NULL; |
1434 | #endif |
1435 | |
1436 | bzero(&ipoa, sizeof(ipoa)); |
1437 | ipoa.ipoa_boundif = IFSCOPE_NONE; |
1438 | ipoa.ipoa_flags = IPOAF_SELECT_SRCIF; |
1439 | |
1440 | struct ifnet *outif = NULL; |
1441 | struct flowadv *adv = &ipoa.ipoa_flowadv; |
1442 | int sotc = SO_TC_UNSPEC; |
1443 | int netsvctype = _NET_SERVICE_TYPE_UNSPEC; |
1444 | struct ifnet *origoutifp = NULL; |
1445 | int flowadv = 0; |
1446 | |
1447 | /* Enable flow advisory only when connected */ |
1448 | flowadv = (so->so_state & SS_ISCONNECTED) ? 1 : 0; |
1449 | pi_laddr.s_addr = INADDR_ANY; |
1450 | |
1451 | KERNEL_DEBUG(DBG_FNC_UDP_OUTPUT | DBG_FUNC_START, 0, 0, 0, 0, 0); |
1452 | |
1453 | socket_lock_assert_owned(so); |
1454 | |
1455 | #if CONTENT_FILTER |
1456 | /* |
1457 | * If socket is subject to UDP Content Filter and no addr is passed in, |
1458 | * retrieve CFIL saved state from mbuf and use it if necessary. |
1459 | */ |
1460 | if (so->so_cfil_db && !addr) { |
1461 | cfil_tag = cfil_udp_get_socket_state(m, &cfil_so_state_change_cnt, &cfil_so_options, &cfil_faddr); |
1462 | if (cfil_tag) { |
1463 | sin = (struct sockaddr_in *)(void *)cfil_faddr; |
1464 | if (inp && inp->inp_faddr.s_addr == INADDR_ANY) { |
1465 | /* |
1466 | * Socket is unconnected, simply use the saved faddr as 'addr' to go through |
1467 | * the connect/disconnect logic. |
1468 | */ |
1469 | addr = (struct sockaddr *)cfil_faddr; |
1470 | } else if ((so->so_state_change_cnt != cfil_so_state_change_cnt) && |
1471 | (inp->inp_fport != sin->sin_port || |
1472 | inp->inp_faddr.s_addr != sin->sin_addr.s_addr)) { |
1473 | /* |
1474 | * Socket is connected but socket state and dest addr/port changed. |
1475 | * We need to use the saved faddr info. |
1476 | */ |
1477 | cfil_faddr_use = true; |
1478 | } |
1479 | } |
1480 | } |
1481 | #endif |
1482 | |
1483 | if (control != NULL) { |
1484 | sotc = so_tc_from_control(control, &netsvctype); |
1485 | VERIFY(outif == NULL); |
1486 | error = udp_check_pktinfo(control, &outif, &pi_laddr); |
1487 | m_freem(control); |
1488 | control = NULL; |
1489 | if (error) |
1490 | goto release; |
1491 | pktinfo++; |
1492 | if (outif != NULL) |
1493 | ipoa.ipoa_boundif = outif->if_index; |
1494 | } |
1495 | if (sotc == SO_TC_UNSPEC) { |
1496 | sotc = so->so_traffic_class; |
1497 | netsvctype = so->so_netsvctype; |
1498 | } |
1499 | |
1500 | KERNEL_DEBUG(DBG_LAYER_OUT_BEG, inp->inp_fport, inp->inp_lport, |
1501 | inp->inp_laddr.s_addr, inp->inp_faddr.s_addr, |
1502 | (htons((u_short)len + sizeof (struct udphdr)))); |
1503 | |
1504 | if (len + sizeof (struct udpiphdr) > IP_MAXPACKET) { |
1505 | error = EMSGSIZE; |
1506 | goto release; |
1507 | } |
1508 | |
1509 | if (flowadv && INP_WAIT_FOR_IF_FEEDBACK(inp)) { |
1510 | /* |
1511 | * The socket is flow-controlled, drop the packets |
1512 | * until the inp is not flow controlled |
1513 | */ |
1514 | error = ENOBUFS; |
1515 | goto release; |
1516 | } |
1517 | /* |
1518 | * If socket was bound to an ifindex, tell ip_output about it. |
1519 | * If the ancillary IP_PKTINFO option contains an interface index, |
1520 | * it takes precedence over the one specified by IP_BOUND_IF. |
1521 | */ |
1522 | if (ipoa.ipoa_boundif == IFSCOPE_NONE && |
1523 | (inp->inp_flags & INP_BOUND_IF)) { |
1524 | VERIFY(inp->inp_boundifp != NULL); |
1525 | ifnet_reference(inp->inp_boundifp); /* for this routine */ |
1526 | if (outif != NULL) |
1527 | ifnet_release(outif); |
1528 | outif = inp->inp_boundifp; |
1529 | ipoa.ipoa_boundif = outif->if_index; |
1530 | } |
1531 | if (INP_NO_CELLULAR(inp)) |
1532 | ipoa.ipoa_flags |= IPOAF_NO_CELLULAR; |
1533 | if (INP_NO_EXPENSIVE(inp)) |
1534 | ipoa.ipoa_flags |= IPOAF_NO_EXPENSIVE; |
1535 | if (INP_AWDL_UNRESTRICTED(inp)) |
1536 | ipoa.ipoa_flags |= IPOAF_AWDL_UNRESTRICTED; |
1537 | ipoa.ipoa_sotc = sotc; |
1538 | ipoa.ipoa_netsvctype = netsvctype; |
1539 | soopts |= IP_OUTARGS; |
1540 | |
1541 | /* |
1542 | * If there was a routing change, discard cached route and check |
1543 | * that we have a valid source address. Reacquire a new source |
1544 | * address if INADDR_ANY was specified. |
1545 | * |
1546 | * If we are using cfil saved state, go through this cache cleanup |
1547 | * so that we can get a new route. |
1548 | */ |
1549 | if (ROUTE_UNUSABLE(&inp->inp_route) |
1550 | #if CONTENT_FILTER |
1551 | || cfil_faddr_use |
1552 | #endif |
1553 | ) { |
1554 | struct in_ifaddr *ia = NULL; |
1555 | |
1556 | ROUTE_RELEASE(&inp->inp_route); |
1557 | |
1558 | /* src address is gone? */ |
1559 | if (inp->inp_laddr.s_addr != INADDR_ANY && |
1560 | (ia = ifa_foraddr(inp->inp_laddr.s_addr)) == NULL) { |
1561 | if (!(inp->inp_flags & INP_INADDR_ANY) || |
1562 | (so->so_state & SS_ISCONNECTED)) { |
1563 | /* |
1564 | * Rdar://5448998 |
1565 | * If the source address is gone, return an |
1566 | * error if: |
1567 | * - the source was specified |
1568 | * - the socket was already connected |
1569 | */ |
1570 | soevent(so, (SO_FILT_HINT_LOCKED | |
1571 | SO_FILT_HINT_NOSRCADDR)); |
1572 | error = EADDRNOTAVAIL; |
1573 | goto release; |
1574 | } else { |
1575 | /* new src will be set later */ |
1576 | inp->inp_laddr.s_addr = INADDR_ANY; |
1577 | inp->inp_last_outifp = NULL; |
1578 | } |
1579 | } |
1580 | if (ia != NULL) |
1581 | IFA_REMREF(&ia->ia_ifa); |
1582 | } |
1583 | |
1584 | /* |
1585 | * IP_PKTINFO option check. If a temporary scope or src address |
1586 | * is provided, use it for this packet only and make sure we forget |
1587 | * it after sending this datagram. |
1588 | */ |
1589 | if (pi_laddr.s_addr != INADDR_ANY || |
1590 | (ipoa.ipoa_boundif != IFSCOPE_NONE && pktinfo)) { |
1591 | /* temp src address for this datagram only */ |
1592 | laddr = pi_laddr; |
1593 | origladdr.s_addr = INADDR_ANY; |
1594 | /* we don't want to keep the laddr or route */ |
1595 | udp_dodisconnect = 1; |
1596 | /* remember we don't care about src addr */ |
1597 | inp->inp_flags |= INP_INADDR_ANY; |
1598 | } else { |
1599 | origladdr = laddr = inp->inp_laddr; |
1600 | } |
1601 | |
1602 | origoutifp = inp->inp_last_outifp; |
1603 | faddr = inp->inp_faddr; |
1604 | lport = inp->inp_lport; |
1605 | fport = inp->inp_fport; |
1606 | |
1607 | #if CONTENT_FILTER |
1608 | if (cfil_faddr_use) |
1609 | { |
1610 | faddr = ((struct sockaddr_in *)(void *)cfil_faddr)->sin_addr; |
1611 | fport = ((struct sockaddr_in *)(void *)cfil_faddr)->sin_port; |
1612 | } |
1613 | #endif |
1614 | |
1615 | if (addr) { |
1616 | sin = (struct sockaddr_in *)(void *)addr; |
1617 | if (faddr.s_addr != INADDR_ANY) { |
1618 | error = EISCONN; |
1619 | goto release; |
1620 | } |
1621 | if (lport == 0) { |
1622 | /* |
1623 | * In case we don't have a local port set, go through |
1624 | * the full connect. We don't have a local port yet |
1625 | * (i.e., we can't be looked up), so it's not an issue |
1626 | * if the input runs at the same time we do this. |
1627 | */ |
1628 | /* if we have a source address specified, use that */ |
1629 | if (pi_laddr.s_addr != INADDR_ANY) |
1630 | inp->inp_laddr = pi_laddr; |
1631 | /* |
1632 | * If a scope is specified, use it. Scope from |
1633 | * IP_PKTINFO takes precendence over the the scope |
1634 | * set via INP_BOUND_IF. |
1635 | */ |
1636 | error = in_pcbconnect(inp, addr, p, ipoa.ipoa_boundif, |
1637 | &outif); |
1638 | if (error) |
1639 | goto release; |
1640 | |
1641 | laddr = inp->inp_laddr; |
1642 | lport = inp->inp_lport; |
1643 | faddr = inp->inp_faddr; |
1644 | fport = inp->inp_fport; |
1645 | udp_dodisconnect = 1; |
1646 | |
1647 | /* synch up in case in_pcbladdr() overrides */ |
1648 | if (outif != NULL && ipoa.ipoa_boundif != IFSCOPE_NONE) |
1649 | ipoa.ipoa_boundif = outif->if_index; |
1650 | } else { |
1651 | /* |
1652 | * Fast path case |
1653 | * |
1654 | * We have a full address and a local port; use those |
1655 | * info to build the packet without changing the pcb |
1656 | * and interfering with the input path. See 3851370. |
1657 | * |
1658 | * Scope from IP_PKTINFO takes precendence over the |
1659 | * the scope set via INP_BOUND_IF. |
1660 | */ |
1661 | if (laddr.s_addr == INADDR_ANY) { |
1662 | if ((error = in_pcbladdr(inp, addr, &laddr, |
1663 | ipoa.ipoa_boundif, &outif, 0)) != 0) |
1664 | goto release; |
1665 | /* |
1666 | * from pcbconnect: remember we don't |
1667 | * care about src addr. |
1668 | */ |
1669 | inp->inp_flags |= INP_INADDR_ANY; |
1670 | |
1671 | /* synch up in case in_pcbladdr() overrides */ |
1672 | if (outif != NULL && |
1673 | ipoa.ipoa_boundif != IFSCOPE_NONE) |
1674 | ipoa.ipoa_boundif = outif->if_index; |
1675 | } |
1676 | |
1677 | faddr = sin->sin_addr; |
1678 | fport = sin->sin_port; |
1679 | } |
1680 | } else { |
1681 | if (faddr.s_addr == INADDR_ANY) { |
1682 | error = ENOTCONN; |
1683 | goto release; |
1684 | } |
1685 | } |
1686 | |
1687 | #if CONFIG_MACF_NET |
1688 | mac_mbuf_label_associate_inpcb(inp, m); |
1689 | #endif /* CONFIG_MACF_NET */ |
1690 | |
1691 | if (inp->inp_flowhash == 0) |
1692 | inp->inp_flowhash = inp_calc_flowhash(inp); |
1693 | |
1694 | if (fport == htons(53) && !(so->so_flags1 & SOF1_DNS_COUNTED)) { |
1695 | so->so_flags1 |= SOF1_DNS_COUNTED; |
1696 | INC_ATOMIC_INT64_LIM(net_api_stats.nas_socket_inet_dgram_dns); |
1697 | } |
1698 | |
1699 | /* |
1700 | * Calculate data length and get a mbuf |
1701 | * for UDP and IP headers. |
1702 | */ |
1703 | M_PREPEND(m, sizeof (struct udpiphdr), M_DONTWAIT, 1); |
1704 | if (m == 0) { |
1705 | error = ENOBUFS; |
1706 | goto abort; |
1707 | } |
1708 | |
1709 | /* |
1710 | * Fill in mbuf with extended UDP header |
1711 | * and addresses and length put into network format. |
1712 | */ |
1713 | ui = mtod(m, struct udpiphdr *); |
1714 | bzero(ui->ui_x1, sizeof (ui->ui_x1)); /* XXX still needed? */ |
1715 | ui->ui_pr = IPPROTO_UDP; |
1716 | ui->ui_src = laddr; |
1717 | ui->ui_dst = faddr; |
1718 | ui->ui_sport = lport; |
1719 | ui->ui_dport = fport; |
1720 | ui->ui_ulen = htons((u_short)len + sizeof (struct udphdr)); |
1721 | |
1722 | /* |
1723 | * Set up checksum to pseudo header checksum and output datagram. |
1724 | * |
1725 | * Treat flows to be CLAT46'd as IPv6 flow and compute checksum |
1726 | * no matter what, as IPv6 mandates checksum for UDP. |
1727 | * |
1728 | * Here we only compute the one's complement sum of the pseudo header. |
1729 | * The payload computation and final complement is delayed to much later |
1730 | * in IP processing to decide if remaining computation needs to be done |
1731 | * through offload. |
1732 | * |
1733 | * That is communicated by setting CSUM_UDP in csum_flags. |
1734 | * The offset of checksum from the start of ULP header is communicated |
1735 | * through csum_data. |
1736 | * |
1737 | * Note since this already contains the pseudo checksum header, any |
1738 | * later operation at IP layer that modify the values used here must |
1739 | * update the checksum as well (for example NAT etc). |
1740 | */ |
1741 | if ((inp->inp_flags2 & INP2_CLAT46_FLOW) || |
1742 | (udpcksum && !(inp->inp_flags & INP_UDP_NOCKSUM))) { |
1743 | ui->ui_sum = in_pseudo(ui->ui_src.s_addr, ui->ui_dst.s_addr, |
1744 | htons((u_short)len + sizeof (struct udphdr) + IPPROTO_UDP)); |
1745 | m->m_pkthdr.csum_flags = (CSUM_UDP|CSUM_ZERO_INVERT); |
1746 | m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); |
1747 | } else { |
1748 | ui->ui_sum = 0; |
1749 | } |
1750 | ((struct ip *)ui)->ip_len = sizeof (struct udpiphdr) + len; |
1751 | ((struct ip *)ui)->ip_ttl = inp->inp_ip_ttl; /* XXX */ |
1752 | ((struct ip *)ui)->ip_tos = inp->inp_ip_tos; /* XXX */ |
1753 | udpstat.udps_opackets++; |
1754 | |
1755 | KERNEL_DEBUG(DBG_LAYER_OUT_END, ui->ui_dport, ui->ui_sport, |
1756 | ui->ui_src.s_addr, ui->ui_dst.s_addr, ui->ui_ulen); |
1757 | |
1758 | #if NECP |
1759 | { |
1760 | necp_kernel_policy_id policy_id; |
1761 | necp_kernel_policy_id skip_policy_id; |
1762 | u_int32_t route_rule_id; |
1763 | |
1764 | /* |
1765 | * We need a route to perform NECP route rule checks |
1766 | */ |
1767 | if (net_qos_policy_restricted != 0 && |
1768 | ROUTE_UNUSABLE(&inp->inp_route)) { |
1769 | struct sockaddr_in to; |
1770 | struct sockaddr_in from; |
1771 | |
1772 | ROUTE_RELEASE(&inp->inp_route); |
1773 | |
1774 | bzero(&from, sizeof(struct sockaddr_in)); |
1775 | from.sin_family = AF_INET; |
1776 | from.sin_len = sizeof(struct sockaddr_in); |
1777 | from.sin_addr = laddr; |
1778 | |
1779 | bzero(&to, sizeof(struct sockaddr_in)); |
1780 | to.sin_family = AF_INET; |
1781 | to.sin_len = sizeof(struct sockaddr_in); |
1782 | to.sin_addr = faddr; |
1783 | |
1784 | inp->inp_route.ro_dst.sa_family = AF_INET; |
1785 | inp->inp_route.ro_dst.sa_len = sizeof(struct sockaddr_in); |
1786 | ((struct sockaddr_in *)(void *)&inp->inp_route.ro_dst)->sin_addr = |
1787 | faddr; |
1788 | |
1789 | rtalloc_scoped(&inp->inp_route, ipoa.ipoa_boundif); |
1790 | |
1791 | inp_update_necp_policy(inp, (struct sockaddr *)&from, |
1792 | (struct sockaddr *)&to, ipoa.ipoa_boundif); |
1793 | inp->inp_policyresult.results.qos_marking_gencount = 0; |
1794 | } |
1795 | |
1796 | if (!necp_socket_is_allowed_to_send_recv_v4(inp, lport, fport, |
1797 | &laddr, &faddr, NULL, &policy_id, &route_rule_id, &skip_policy_id)) { |
1798 | error = EHOSTUNREACH; |
1799 | goto abort; |
1800 | } |
1801 | |
1802 | necp_mark_packet_from_socket(m, inp, policy_id, route_rule_id, skip_policy_id); |
1803 | |
1804 | if (net_qos_policy_restricted != 0) { |
1805 | necp_socket_update_qos_marking(inp, |
1806 | inp->inp_route.ro_rt, NULL, route_rule_id); |
1807 | } |
1808 | } |
1809 | #endif /* NECP */ |
1810 | if ((so->so_flags1 & SOF1_QOSMARKING_ALLOWED)) |
1811 | ipoa.ipoa_flags |= IPOAF_QOSMARKING_ALLOWED; |
1812 | |
1813 | #if IPSEC |
1814 | if (inp->inp_sp != NULL && ipsec_setsocket(m, inp->inp_socket) != 0) { |
1815 | error = ENOBUFS; |
1816 | goto abort; |
1817 | } |
1818 | #endif /* IPSEC */ |
1819 | |
1820 | inpopts = inp->inp_options; |
1821 | #if CONTENT_FILTER |
1822 | if (cfil_tag && (inp->inp_socket->so_options != cfil_so_options)) |
1823 | soopts |= (cfil_so_options & (SO_DONTROUTE | SO_BROADCAST)); |
1824 | else |
1825 | #endif |
1826 | soopts |= (inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST)); |
1827 | |
1828 | mopts = inp->inp_moptions; |
1829 | if (mopts != NULL) { |
1830 | IMO_LOCK(mopts); |
1831 | IMO_ADDREF_LOCKED(mopts); |
1832 | if (IN_MULTICAST(ntohl(ui->ui_dst.s_addr)) && |
1833 | mopts->imo_multicast_ifp != NULL) { |
1834 | /* no reference needed */ |
1835 | inp->inp_last_outifp = mopts->imo_multicast_ifp; |
1836 | |
1837 | } |
1838 | IMO_UNLOCK(mopts); |
1839 | } |
1840 | |
1841 | /* Copy the cached route and take an extra reference */ |
1842 | inp_route_copyout(inp, &ro); |
1843 | |
1844 | set_packet_service_class(m, so, sotc, 0); |
1845 | m->m_pkthdr.pkt_flowsrc = FLOWSRC_INPCB; |
1846 | m->m_pkthdr.pkt_flowid = inp->inp_flowhash; |
1847 | m->m_pkthdr.pkt_proto = IPPROTO_UDP; |
1848 | m->m_pkthdr.pkt_flags |= (PKTF_FLOW_ID | PKTF_FLOW_LOCALSRC); |
1849 | if (flowadv) |
1850 | m->m_pkthdr.pkt_flags |= PKTF_FLOW_ADV; |
1851 | m->m_pkthdr.tx_udp_pid = so->last_pid; |
1852 | if (so->so_flags & SOF_DELEGATED) |
1853 | m->m_pkthdr.tx_udp_e_pid = so->e_pid; |
1854 | else |
1855 | m->m_pkthdr.tx_udp_e_pid = 0; |
1856 | |
1857 | if (ipoa.ipoa_boundif != IFSCOPE_NONE) |
1858 | ipoa.ipoa_flags |= IPOAF_BOUND_IF; |
1859 | |
1860 | if (laddr.s_addr != INADDR_ANY) |
1861 | ipoa.ipoa_flags |= IPOAF_BOUND_SRCADDR; |
1862 | |
1863 | inp->inp_sndinprog_cnt++; |
1864 | |
1865 | socket_unlock(so, 0); |
1866 | error = ip_output(m, inpopts, &ro, soopts, mopts, &ipoa); |
1867 | m = NULL; |
1868 | socket_lock(so, 0); |
1869 | if (mopts != NULL) |
1870 | IMO_REMREF(mopts); |
1871 | |
1872 | if (error == 0 && nstat_collect) { |
1873 | boolean_t cell, wifi, wired; |
1874 | |
1875 | if (ro.ro_rt != NULL) { |
1876 | cell = IFNET_IS_CELLULAR(ro.ro_rt->rt_ifp); |
1877 | wifi = (!cell && IFNET_IS_WIFI(ro.ro_rt->rt_ifp)); |
1878 | wired = (!wifi && IFNET_IS_WIRED(ro.ro_rt->rt_ifp)); |
1879 | } else { |
1880 | cell = wifi = wired = FALSE; |
1881 | } |
1882 | INP_ADD_STAT(inp, cell, wifi, wired, txpackets, 1); |
1883 | INP_ADD_STAT(inp, cell, wifi, wired, txbytes, len); |
1884 | inp_set_activity_bitmap(inp); |
1885 | } |
1886 | |
1887 | if (flowadv && (adv->code == FADV_FLOW_CONTROLLED || |
1888 | adv->code == FADV_SUSPENDED)) { |
1889 | /* |
1890 | * return a hint to the application that |
1891 | * the packet has been dropped |
1892 | */ |
1893 | error = ENOBUFS; |
1894 | inp_set_fc_state(inp, adv->code); |
1895 | } |
1896 | |
1897 | VERIFY(inp->inp_sndinprog_cnt > 0); |
1898 | if ( --inp->inp_sndinprog_cnt == 0) |
1899 | inp->inp_flags &= ~(INP_FC_FEEDBACK); |
1900 | |
1901 | /* Synchronize PCB cached route */ |
1902 | inp_route_copyin(inp, &ro); |
1903 | |
1904 | abort: |
1905 | if (udp_dodisconnect) { |
1906 | /* Always discard the cached route for unconnected socket */ |
1907 | ROUTE_RELEASE(&inp->inp_route); |
1908 | in_pcbdisconnect(inp); |
1909 | inp->inp_laddr = origladdr; /* XXX rehash? */ |
1910 | /* no reference needed */ |
1911 | inp->inp_last_outifp = origoutifp; |
1912 | |
1913 | } else if (inp->inp_route.ro_rt != NULL) { |
1914 | struct rtentry *rt = inp->inp_route.ro_rt; |
1915 | struct ifnet *outifp; |
1916 | |
1917 | if (rt->rt_flags & (RTF_MULTICAST|RTF_BROADCAST)) |
1918 | rt = NULL; /* unusable */ |
1919 | |
1920 | #if CONTENT_FILTER |
1921 | /* |
1922 | * Discard temporary route for cfil case |
1923 | */ |
1924 | if (cfil_faddr_use) |
1925 | rt = NULL; /* unusable */ |
1926 | #endif |
1927 | |
1928 | /* |
1929 | * Always discard if it is a multicast or broadcast route. |
1930 | */ |
1931 | if (rt == NULL) |
1932 | ROUTE_RELEASE(&inp->inp_route); |
1933 | |
1934 | /* |
1935 | * If the destination route is unicast, update outifp with |
1936 | * that of the route interface used by IP. |
1937 | */ |
1938 | if (rt != NULL && |
1939 | (outifp = rt->rt_ifp) != inp->inp_last_outifp) { |
1940 | inp->inp_last_outifp = outifp; /* no reference needed */ |
1941 | |
1942 | so->so_pktheadroom = P2ROUNDUP( |
1943 | sizeof(struct udphdr) + |
1944 | sizeof(struct ip) + |
1945 | ifnet_hdrlen(outifp) + |
1946 | ifnet_mbuf_packetpreamblelen(outifp), |
1947 | sizeof(u_int32_t)); |
1948 | } |
1949 | } else { |
1950 | ROUTE_RELEASE(&inp->inp_route); |
1951 | } |
1952 | |
1953 | /* |
1954 | * If output interface was cellular/expensive, and this socket is |
1955 | * denied access to it, generate an event. |
1956 | */ |
1957 | if (error != 0 && (ipoa.ipoa_retflags & IPOARF_IFDENIED) && |
1958 | (INP_NO_CELLULAR(inp) || INP_NO_EXPENSIVE(inp))) |
1959 | soevent(so, (SO_FILT_HINT_LOCKED|SO_FILT_HINT_IFDENIED)); |
1960 | |
1961 | release: |
1962 | KERNEL_DEBUG(DBG_FNC_UDP_OUTPUT | DBG_FUNC_END, error, 0, 0, 0, 0); |
1963 | |
1964 | if (m != NULL) |
1965 | m_freem(m); |
1966 | |
1967 | if (outif != NULL) |
1968 | ifnet_release(outif); |
1969 | |
1970 | #if CONTENT_FILTER |
1971 | if (cfil_tag) |
1972 | m_tag_free(cfil_tag); |
1973 | #endif |
1974 | |
1975 | return (error); |
1976 | } |
1977 | |
1978 | u_int32_t udp_sendspace = 9216; /* really max datagram size */ |
1979 | /* 187 1K datagrams (approx 192 KB) */ |
1980 | u_int32_t udp_recvspace = 187 * (1024 + |
1981 | #if INET6 |
1982 | sizeof (struct sockaddr_in6) |
1983 | #else /* !INET6 */ |
1984 | sizeof (struct sockaddr_in) |
1985 | #endif /* !INET6 */ |
1986 | ); |
1987 | |
1988 | /* Check that the values of udp send and recv space do not exceed sb_max */ |
1989 | static int |
1990 | sysctl_udp_sospace(struct sysctl_oid *oidp, void *arg1, int arg2, |
1991 | struct sysctl_req *req) |
1992 | { |
1993 | #pragma unused(arg1, arg2) |
1994 | u_int32_t new_value = 0, *space_p = NULL; |
1995 | int changed = 0, error = 0; |
1996 | u_quad_t sb_effective_max = (sb_max/(MSIZE+MCLBYTES)) * MCLBYTES; |
1997 | |
1998 | switch (oidp->oid_number) { |
1999 | case UDPCTL_RECVSPACE: |
2000 | space_p = &udp_recvspace; |
2001 | break; |
2002 | case UDPCTL_MAXDGRAM: |
2003 | space_p = &udp_sendspace; |
2004 | break; |
2005 | default: |
2006 | return (EINVAL); |
2007 | } |
2008 | error = sysctl_io_number(req, *space_p, sizeof (u_int32_t), |
2009 | &new_value, &changed); |
2010 | if (changed) { |
2011 | if (new_value > 0 && new_value <= sb_effective_max) |
2012 | *space_p = new_value; |
2013 | else |
2014 | error = ERANGE; |
2015 | } |
2016 | return (error); |
2017 | } |
2018 | |
2019 | SYSCTL_PROC(_net_inet_udp, UDPCTL_RECVSPACE, recvspace, |
2020 | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED, &udp_recvspace, 0, |
2021 | &sysctl_udp_sospace, "IU" , "Maximum incoming UDP datagram size" ); |
2022 | |
2023 | SYSCTL_PROC(_net_inet_udp, UDPCTL_MAXDGRAM, maxdgram, |
2024 | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED, &udp_sendspace, 0, |
2025 | &sysctl_udp_sospace, "IU" , "Maximum outgoing UDP datagram size" ); |
2026 | |
2027 | int |
2028 | udp_abort(struct socket *so) |
2029 | { |
2030 | struct inpcb *inp; |
2031 | |
2032 | inp = sotoinpcb(so); |
2033 | if (inp == NULL) { |
2034 | panic("%s: so=%p null inp\n" , __func__, so); |
2035 | /* NOTREACHED */ |
2036 | } |
2037 | soisdisconnected(so); |
2038 | in_pcbdetach(inp); |
2039 | return (0); |
2040 | } |
2041 | |
2042 | int |
2043 | udp_attach(struct socket *so, int proto, struct proc *p) |
2044 | { |
2045 | #pragma unused(proto) |
2046 | struct inpcb *inp; |
2047 | int error; |
2048 | |
2049 | inp = sotoinpcb(so); |
2050 | if (inp != NULL) { |
2051 | panic("%s so=%p inp=%p\n" , __func__, so, inp); |
2052 | /* NOTREACHED */ |
2053 | } |
2054 | error = in_pcballoc(so, &udbinfo, p); |
2055 | if (error != 0) |
2056 | return (error); |
2057 | error = soreserve(so, udp_sendspace, udp_recvspace); |
2058 | if (error != 0) |
2059 | return (error); |
2060 | inp = (struct inpcb *)so->so_pcb; |
2061 | inp->inp_vflag |= INP_IPV4; |
2062 | inp->inp_ip_ttl = ip_defttl; |
2063 | if (nstat_collect) |
2064 | nstat_udp_new_pcb(inp); |
2065 | return (0); |
2066 | } |
2067 | |
2068 | int |
2069 | udp_bind(struct socket *so, struct sockaddr *nam, struct proc *p) |
2070 | { |
2071 | struct inpcb *inp; |
2072 | int error; |
2073 | |
2074 | if (nam->sa_family != 0 && nam->sa_family != AF_INET && |
2075 | nam->sa_family != AF_INET6) |
2076 | return (EAFNOSUPPORT); |
2077 | |
2078 | inp = sotoinpcb(so); |
2079 | if (inp == NULL) |
2080 | return (EINVAL); |
2081 | error = in_pcbbind(inp, nam, p); |
2082 | |
2083 | #if NECP |
2084 | /* Update NECP client with bind result if not in middle of connect */ |
2085 | if (error == 0 && |
2086 | (inp->inp_flags2 & INP2_CONNECT_IN_PROGRESS) && |
2087 | !uuid_is_null(inp->necp_client_uuid)) { |
2088 | socket_unlock(so, 0); |
2089 | necp_client_assign_from_socket(so->last_pid, inp->necp_client_uuid, inp); |
2090 | socket_lock(so, 0); |
2091 | } |
2092 | #endif /* NECP */ |
2093 | |
2094 | return (error); |
2095 | } |
2096 | |
2097 | int |
2098 | udp_connect(struct socket *so, struct sockaddr *nam, struct proc *p) |
2099 | { |
2100 | struct inpcb *inp; |
2101 | int error; |
2102 | |
2103 | inp = sotoinpcb(so); |
2104 | if (inp == NULL) |
2105 | return (EINVAL); |
2106 | if (inp->inp_faddr.s_addr != INADDR_ANY) |
2107 | return (EISCONN); |
2108 | |
2109 | if (!(so->so_flags1 & SOF1_CONNECT_COUNTED)) { |
2110 | so->so_flags1 |= SOF1_CONNECT_COUNTED; |
2111 | INC_ATOMIC_INT64_LIM(net_api_stats.nas_socket_inet_dgram_connected); |
2112 | } |
2113 | |
2114 | #if NECP |
2115 | #if FLOW_DIVERT |
2116 | if (necp_socket_should_use_flow_divert(inp)) { |
2117 | uint32_t fd_ctl_unit = |
2118 | necp_socket_get_flow_divert_control_unit(inp); |
2119 | if (fd_ctl_unit > 0) { |
2120 | error = flow_divert_pcb_init(so, fd_ctl_unit); |
2121 | if (error == 0) { |
2122 | error = flow_divert_connect_out(so, nam, p); |
2123 | } |
2124 | } else { |
2125 | error = ENETDOWN; |
2126 | } |
2127 | return (error); |
2128 | } |
2129 | #endif /* FLOW_DIVERT */ |
2130 | #endif /* NECP */ |
2131 | |
2132 | error = in_pcbconnect(inp, nam, p, IFSCOPE_NONE, NULL); |
2133 | if (error == 0) { |
2134 | #if NECP |
2135 | /* Update NECP client with connected five-tuple */ |
2136 | if (!uuid_is_null(inp->necp_client_uuid)) { |
2137 | socket_unlock(so, 0); |
2138 | necp_client_assign_from_socket(so->last_pid, inp->necp_client_uuid, inp); |
2139 | socket_lock(so, 0); |
2140 | } |
2141 | #endif /* NECP */ |
2142 | |
2143 | soisconnected(so); |
2144 | if (inp->inp_flowhash == 0) |
2145 | inp->inp_flowhash = inp_calc_flowhash(inp); |
2146 | } |
2147 | return (error); |
2148 | } |
2149 | |
2150 | int |
2151 | udp_connectx_common(struct socket *so, int af, struct sockaddr *src, struct sockaddr *dst, |
2152 | struct proc *p, uint32_t ifscope, sae_associd_t aid, sae_connid_t *pcid, |
2153 | uint32_t flags, void *arg, uint32_t arglen, |
2154 | struct uio *uio, user_ssize_t *bytes_written) |
2155 | { |
2156 | #pragma unused(aid, flags, arg, arglen) |
2157 | struct inpcb *inp = sotoinpcb(so); |
2158 | int error = 0; |
2159 | user_ssize_t datalen = 0; |
2160 | |
2161 | if (inp == NULL) |
2162 | return (EINVAL); |
2163 | |
2164 | VERIFY(dst != NULL); |
2165 | |
2166 | ASSERT(!(inp->inp_flags2 & INP2_CONNECT_IN_PROGRESS)); |
2167 | inp->inp_flags2 |= INP2_CONNECT_IN_PROGRESS; |
2168 | |
2169 | #if NECP |
2170 | inp_update_necp_policy(inp, src, dst, ifscope); |
2171 | #endif /* NECP */ |
2172 | |
2173 | /* bind socket to the specified interface, if requested */ |
2174 | if (ifscope != IFSCOPE_NONE && |
2175 | (error = inp_bindif(inp, ifscope, NULL)) != 0) { |
2176 | goto done; |
2177 | } |
2178 | |
2179 | /* if source address and/or port is specified, bind to it */ |
2180 | if (src != NULL) { |
2181 | error = sobindlock(so, src, 0); /* already locked */ |
2182 | if (error != 0) { |
2183 | goto done; |
2184 | } |
2185 | } |
2186 | |
2187 | switch (af) { |
2188 | case AF_INET: |
2189 | error = udp_connect(so, dst, p); |
2190 | break; |
2191 | #if INET6 |
2192 | case AF_INET6: |
2193 | error = udp6_connect(so, dst, p); |
2194 | break; |
2195 | #endif /* INET6 */ |
2196 | default: |
2197 | VERIFY(0); |
2198 | /* NOTREACHED */ |
2199 | } |
2200 | |
2201 | if (error != 0) { |
2202 | goto done; |
2203 | } |
2204 | |
2205 | /* |
2206 | * If there is data, copy it. DATA_IDEMPOTENT is ignored. |
2207 | * CONNECT_RESUME_ON_READ_WRITE is ignored. |
2208 | */ |
2209 | if (uio != NULL) { |
2210 | socket_unlock(so, 0); |
2211 | |
2212 | VERIFY(bytes_written != NULL); |
2213 | |
2214 | datalen = uio_resid(uio); |
2215 | error = so->so_proto->pr_usrreqs->pru_sosend(so, NULL, |
2216 | (uio_t)uio, NULL, NULL, 0); |
2217 | socket_lock(so, 0); |
2218 | |
2219 | /* If error returned is EMSGSIZE, for example, disconnect */ |
2220 | if (error == 0 || error == EWOULDBLOCK) |
2221 | *bytes_written = datalen - uio_resid(uio); |
2222 | else |
2223 | (void) so->so_proto->pr_usrreqs->pru_disconnectx(so, |
2224 | SAE_ASSOCID_ANY, SAE_CONNID_ANY); |
2225 | /* |
2226 | * mask the EWOULDBLOCK error so that the caller |
2227 | * knows that atleast the connect was successful. |
2228 | */ |
2229 | if (error == EWOULDBLOCK) |
2230 | error = 0; |
2231 | } |
2232 | |
2233 | if (error == 0 && pcid != NULL) |
2234 | *pcid = 1; /* there is only 1 connection for UDP */ |
2235 | |
2236 | done: |
2237 | inp->inp_flags2 &= ~INP2_CONNECT_IN_PROGRESS; |
2238 | return (error); |
2239 | } |
2240 | |
2241 | int |
2242 | udp_connectx(struct socket *so, struct sockaddr *src, |
2243 | struct sockaddr *dst, struct proc *p, uint32_t ifscope, |
2244 | sae_associd_t aid, sae_connid_t *pcid, uint32_t flags, void *arg, |
2245 | uint32_t arglen, struct uio *uio, user_ssize_t *bytes_written) |
2246 | { |
2247 | return (udp_connectx_common(so, AF_INET, src, dst, |
2248 | p, ifscope, aid, pcid, flags, arg, arglen, uio, bytes_written)); |
2249 | } |
2250 | |
2251 | int |
2252 | udp_detach(struct socket *so) |
2253 | { |
2254 | struct inpcb *inp; |
2255 | |
2256 | inp = sotoinpcb(so); |
2257 | if (inp == NULL) { |
2258 | panic("%s: so=%p null inp\n" , __func__, so); |
2259 | /* NOTREACHED */ |
2260 | } |
2261 | |
2262 | /* |
2263 | * If this is a socket that does not want to wakeup the device |
2264 | * for it's traffic, the application might be waiting for |
2265 | * close to complete before going to sleep. Send a notification |
2266 | * for this kind of sockets |
2267 | */ |
2268 | if (so->so_options & SO_NOWAKEFROMSLEEP) |
2269 | socket_post_kev_msg_closed(so); |
2270 | |
2271 | in_pcbdetach(inp); |
2272 | inp->inp_state = INPCB_STATE_DEAD; |
2273 | return (0); |
2274 | } |
2275 | |
2276 | int |
2277 | udp_disconnect(struct socket *so) |
2278 | { |
2279 | struct inpcb *inp; |
2280 | |
2281 | inp = sotoinpcb(so); |
2282 | if (inp == NULL |
2283 | #if NECP |
2284 | || (necp_socket_should_use_flow_divert(inp)) |
2285 | #endif /* NECP */ |
2286 | ) |
2287 | return (inp == NULL ? EINVAL : EPROTOTYPE); |
2288 | if (inp->inp_faddr.s_addr == INADDR_ANY) |
2289 | return (ENOTCONN); |
2290 | |
2291 | in_pcbdisconnect(inp); |
2292 | |
2293 | /* reset flow controlled state, just in case */ |
2294 | inp_reset_fc_state(inp); |
2295 | |
2296 | inp->inp_laddr.s_addr = INADDR_ANY; |
2297 | so->so_state &= ~SS_ISCONNECTED; /* XXX */ |
2298 | inp->inp_last_outifp = NULL; |
2299 | |
2300 | return (0); |
2301 | } |
2302 | |
2303 | int |
2304 | udp_disconnectx(struct socket *so, sae_associd_t aid, sae_connid_t cid) |
2305 | { |
2306 | #pragma unused(cid) |
2307 | if (aid != SAE_ASSOCID_ANY && aid != SAE_ASSOCID_ALL) |
2308 | return (EINVAL); |
2309 | |
2310 | return (udp_disconnect(so)); |
2311 | } |
2312 | |
2313 | int |
2314 | udp_send(struct socket *so, int flags, struct mbuf *m, |
2315 | struct sockaddr *addr, struct mbuf *control, struct proc *p) |
2316 | { |
2317 | #ifndef FLOW_DIVERT |
2318 | #pragma unused(flags) |
2319 | #endif /* !(FLOW_DIVERT) */ |
2320 | struct inpcb *inp; |
2321 | |
2322 | inp = sotoinpcb(so); |
2323 | if (inp == NULL) { |
2324 | if (m != NULL) |
2325 | m_freem(m); |
2326 | if (control != NULL) |
2327 | m_freem(control); |
2328 | return (EINVAL); |
2329 | } |
2330 | |
2331 | #if NECP |
2332 | #if FLOW_DIVERT |
2333 | if (necp_socket_should_use_flow_divert(inp)) { |
2334 | /* Implicit connect */ |
2335 | return (flow_divert_implicit_data_out(so, flags, m, addr, |
2336 | control, p)); |
2337 | } |
2338 | #endif /* FLOW_DIVERT */ |
2339 | #endif /* NECP */ |
2340 | |
2341 | return (udp_output(inp, m, addr, control, p)); |
2342 | } |
2343 | |
2344 | int |
2345 | udp_shutdown(struct socket *so) |
2346 | { |
2347 | struct inpcb *inp; |
2348 | |
2349 | inp = sotoinpcb(so); |
2350 | if (inp == NULL) |
2351 | return (EINVAL); |
2352 | socantsendmore(so); |
2353 | return (0); |
2354 | } |
2355 | |
2356 | int |
2357 | udp_lock(struct socket *so, int refcount, void *debug) |
2358 | { |
2359 | void *lr_saved; |
2360 | |
2361 | if (debug == NULL) |
2362 | lr_saved = __builtin_return_address(0); |
2363 | else |
2364 | lr_saved = debug; |
2365 | |
2366 | if (so->so_pcb != NULL) { |
2367 | LCK_MTX_ASSERT(&((struct inpcb *)so->so_pcb)->inpcb_mtx, |
2368 | LCK_MTX_ASSERT_NOTOWNED); |
2369 | lck_mtx_lock(&((struct inpcb *)so->so_pcb)->inpcb_mtx); |
2370 | } else { |
2371 | panic("%s: so=%p NO PCB! lr=%p lrh= %s\n" , __func__, |
2372 | so, lr_saved, solockhistory_nr(so)); |
2373 | /* NOTREACHED */ |
2374 | } |
2375 | if (refcount) |
2376 | so->so_usecount++; |
2377 | |
2378 | so->lock_lr[so->next_lock_lr] = lr_saved; |
2379 | so->next_lock_lr = (so->next_lock_lr+1) % SO_LCKDBG_MAX; |
2380 | return (0); |
2381 | } |
2382 | |
2383 | int |
2384 | udp_unlock(struct socket *so, int refcount, void *debug) |
2385 | { |
2386 | void *lr_saved; |
2387 | |
2388 | if (debug == NULL) |
2389 | lr_saved = __builtin_return_address(0); |
2390 | else |
2391 | lr_saved = debug; |
2392 | |
2393 | if (refcount) { |
2394 | VERIFY(so->so_usecount > 0); |
2395 | so->so_usecount--; |
2396 | } |
2397 | if (so->so_pcb == NULL) { |
2398 | panic("%s: so=%p NO PCB! lr=%p lrh= %s\n" , __func__, |
2399 | so, lr_saved, solockhistory_nr(so)); |
2400 | /* NOTREACHED */ |
2401 | } else { |
2402 | LCK_MTX_ASSERT(&((struct inpcb *)so->so_pcb)->inpcb_mtx, |
2403 | LCK_MTX_ASSERT_OWNED); |
2404 | so->unlock_lr[so->next_unlock_lr] = lr_saved; |
2405 | so->next_unlock_lr = (so->next_unlock_lr+1) % SO_LCKDBG_MAX; |
2406 | lck_mtx_unlock(&((struct inpcb *)so->so_pcb)->inpcb_mtx); |
2407 | } |
2408 | return (0); |
2409 | } |
2410 | |
2411 | lck_mtx_t * |
2412 | udp_getlock(struct socket *so, int flags) |
2413 | { |
2414 | #pragma unused(flags) |
2415 | struct inpcb *inp = sotoinpcb(so); |
2416 | |
2417 | if (so->so_pcb == NULL) { |
2418 | panic("%s: so=%p NULL so_pcb lrh= %s\n" , __func__, |
2419 | so, solockhistory_nr(so)); |
2420 | /* NOTREACHED */ |
2421 | } |
2422 | return (&inp->inpcb_mtx); |
2423 | } |
2424 | |
2425 | /* |
2426 | * UDP garbage collector callback (inpcb_timer_func_t). |
2427 | * |
2428 | * Returns > 0 to keep timer active. |
2429 | */ |
2430 | static void |
2431 | udp_gc(struct inpcbinfo *ipi) |
2432 | { |
2433 | struct inpcb *inp, *inpnxt; |
2434 | struct socket *so; |
2435 | |
2436 | if (lck_rw_try_lock_exclusive(ipi->ipi_lock) == FALSE) { |
2437 | if (udp_gc_done == TRUE) { |
2438 | udp_gc_done = FALSE; |
2439 | /* couldn't get the lock, must lock next time */ |
2440 | atomic_add_32(&ipi->ipi_gc_req.intimer_fast, 1); |
2441 | return; |
2442 | } |
2443 | lck_rw_lock_exclusive(ipi->ipi_lock); |
2444 | } |
2445 | |
2446 | udp_gc_done = TRUE; |
2447 | |
2448 | for (inp = udb.lh_first; inp != NULL; inp = inpnxt) { |
2449 | inpnxt = inp->inp_list.le_next; |
2450 | |
2451 | /* |
2452 | * Skip unless it's STOPUSING; garbage collector will |
2453 | * be triggered by in_pcb_checkstate() upon setting |
2454 | * wantcnt to that value. If the PCB is already dead, |
2455 | * keep gc active to anticipate wantcnt changing. |
2456 | */ |
2457 | if (inp->inp_wantcnt != WNT_STOPUSING) |
2458 | continue; |
2459 | |
2460 | /* |
2461 | * Skip if busy, no hurry for cleanup. Keep gc active |
2462 | * and try the lock again during next round. |
2463 | */ |
2464 | if (!socket_try_lock(inp->inp_socket)) { |
2465 | atomic_add_32(&ipi->ipi_gc_req.intimer_fast, 1); |
2466 | continue; |
2467 | } |
2468 | |
2469 | /* |
2470 | * Keep gc active unless usecount is 0. |
2471 | */ |
2472 | so = inp->inp_socket; |
2473 | if (so->so_usecount == 0) { |
2474 | if (inp->inp_state != INPCB_STATE_DEAD) { |
2475 | #if INET6 |
2476 | if (SOCK_CHECK_DOM(so, PF_INET6)) |
2477 | in6_pcbdetach(inp); |
2478 | else |
2479 | #endif /* INET6 */ |
2480 | in_pcbdetach(inp); |
2481 | } |
2482 | in_pcbdispose(inp); |
2483 | } else { |
2484 | socket_unlock(so, 0); |
2485 | atomic_add_32(&ipi->ipi_gc_req.intimer_fast, 1); |
2486 | } |
2487 | } |
2488 | lck_rw_done(ipi->ipi_lock); |
2489 | } |
2490 | |
2491 | static int |
2492 | udp_getstat SYSCTL_HANDLER_ARGS |
2493 | { |
2494 | #pragma unused(oidp, arg1, arg2) |
2495 | if (req->oldptr == USER_ADDR_NULL) |
2496 | req->oldlen = (size_t)sizeof (struct udpstat); |
2497 | |
2498 | return (SYSCTL_OUT(req, &udpstat, MIN(sizeof (udpstat), req->oldlen))); |
2499 | } |
2500 | |
2501 | void |
2502 | udp_in_cksum_stats(u_int32_t len) |
2503 | { |
2504 | udpstat.udps_rcv_swcsum++; |
2505 | udpstat.udps_rcv_swcsum_bytes += len; |
2506 | } |
2507 | |
2508 | void |
2509 | udp_out_cksum_stats(u_int32_t len) |
2510 | { |
2511 | udpstat.udps_snd_swcsum++; |
2512 | udpstat.udps_snd_swcsum_bytes += len; |
2513 | } |
2514 | |
2515 | #if INET6 |
2516 | void |
2517 | udp_in6_cksum_stats(u_int32_t len) |
2518 | { |
2519 | udpstat.udps_rcv6_swcsum++; |
2520 | udpstat.udps_rcv6_swcsum_bytes += len; |
2521 | } |
2522 | |
2523 | void |
2524 | udp_out6_cksum_stats(u_int32_t len) |
2525 | { |
2526 | udpstat.udps_snd6_swcsum++; |
2527 | udpstat.udps_snd6_swcsum_bytes += len; |
2528 | } |
2529 | #endif /* INET6 */ |
2530 | |
2531 | /* |
2532 | * Checksum extended UDP header and data. |
2533 | */ |
2534 | static int |
2535 | udp_input_checksum(struct mbuf *m, struct udphdr *uh, int off, int ulen) |
2536 | { |
2537 | struct ifnet *ifp = m->m_pkthdr.rcvif; |
2538 | struct ip *ip = mtod(m, struct ip *); |
2539 | struct ipovly *ipov = (struct ipovly *)ip; |
2540 | |
2541 | if (uh->uh_sum == 0) { |
2542 | udpstat.udps_nosum++; |
2543 | return (0); |
2544 | } |
2545 | |
2546 | /* ip_stripoptions() must have been called before we get here */ |
2547 | ASSERT((ip->ip_hl << 2) == sizeof (*ip)); |
2548 | |
2549 | if ((hwcksum_rx || (ifp->if_flags & IFF_LOOPBACK) || |
2550 | (m->m_pkthdr.pkt_flags & PKTF_LOOP)) && |
2551 | (m->m_pkthdr.csum_flags & CSUM_DATA_VALID)) { |
2552 | if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) { |
2553 | uh->uh_sum = m->m_pkthdr.csum_rx_val; |
2554 | } else { |
2555 | uint32_t sum = m->m_pkthdr.csum_rx_val; |
2556 | uint32_t start = m->m_pkthdr.csum_rx_start; |
2557 | int32_t trailer = (m_pktlen(m) - (off + ulen)); |
2558 | |
2559 | /* |
2560 | * Perform 1's complement adjustment of octets |
2561 | * that got included/excluded in the hardware- |
2562 | * calculated checksum value. Ignore cases |
2563 | * where the value already includes the entire |
2564 | * IP header span, as the sum for those octets |
2565 | * would already be 0 by the time we get here; |
2566 | * IP has already performed its header checksum |
2567 | * checks. If we do need to adjust, restore |
2568 | * the original fields in the IP header when |
2569 | * computing the adjustment value. Also take |
2570 | * care of any trailing bytes and subtract out |
2571 | * their partial sum. |
2572 | */ |
2573 | ASSERT(trailer >= 0); |
2574 | if ((m->m_pkthdr.csum_flags & CSUM_PARTIAL) && |
2575 | ((start != 0 && start != off) || trailer != 0)) { |
2576 | uint32_t swbytes = (uint32_t)trailer; |
2577 | |
2578 | if (start < off) { |
2579 | ip->ip_len += sizeof (*ip); |
2580 | #if BYTE_ORDER != BIG_ENDIAN |
2581 | HTONS(ip->ip_len); |
2582 | HTONS(ip->ip_off); |
2583 | #endif /* BYTE_ORDER != BIG_ENDIAN */ |
2584 | } |
2585 | /* callee folds in sum */ |
2586 | sum = m_adj_sum16(m, start, off, ulen, sum); |
2587 | if (off > start) |
2588 | swbytes += (off - start); |
2589 | else |
2590 | swbytes += (start - off); |
2591 | |
2592 | if (start < off) { |
2593 | #if BYTE_ORDER != BIG_ENDIAN |
2594 | NTOHS(ip->ip_off); |
2595 | NTOHS(ip->ip_len); |
2596 | #endif /* BYTE_ORDER != BIG_ENDIAN */ |
2597 | ip->ip_len -= sizeof (*ip); |
2598 | } |
2599 | |
2600 | if (swbytes != 0) |
2601 | udp_in_cksum_stats(swbytes); |
2602 | if (trailer != 0) |
2603 | m_adj(m, -trailer); |
2604 | } |
2605 | |
2606 | /* callee folds in sum */ |
2607 | uh->uh_sum = in_pseudo(ip->ip_src.s_addr, |
2608 | ip->ip_dst.s_addr, sum + htonl(ulen + IPPROTO_UDP)); |
2609 | } |
2610 | uh->uh_sum ^= 0xffff; |
2611 | } else { |
2612 | uint16_t ip_sum; |
2613 | char b[9]; |
2614 | |
2615 | bcopy(ipov->ih_x1, b, sizeof (ipov->ih_x1)); |
2616 | bzero(ipov->ih_x1, sizeof (ipov->ih_x1)); |
2617 | ip_sum = ipov->ih_len; |
2618 | ipov->ih_len = uh->uh_ulen; |
2619 | uh->uh_sum = in_cksum(m, ulen + sizeof (struct ip)); |
2620 | bcopy(b, ipov->ih_x1, sizeof (ipov->ih_x1)); |
2621 | ipov->ih_len = ip_sum; |
2622 | |
2623 | udp_in_cksum_stats(ulen); |
2624 | } |
2625 | |
2626 | if (uh->uh_sum != 0) { |
2627 | udpstat.udps_badsum++; |
2628 | IF_UDP_STATINC(ifp, badchksum); |
2629 | return (-1); |
2630 | } |
2631 | |
2632 | return (0); |
2633 | } |
2634 | |
2635 | void |
2636 | udp_fill_keepalive_offload_frames(ifnet_t ifp, |
2637 | struct ifnet_keepalive_offload_frame *frames_array, |
2638 | u_int32_t frames_array_count, size_t frame_data_offset, |
2639 | u_int32_t *used_frames_count) |
2640 | { |
2641 | struct inpcb *inp; |
2642 | inp_gen_t gencnt; |
2643 | u_int32_t frame_index = *used_frames_count; |
2644 | |
2645 | if (ifp == NULL || frames_array == NULL || |
2646 | frames_array_count == 0 || |
2647 | frame_index >= frames_array_count || |
2648 | frame_data_offset >= IFNET_KEEPALIVE_OFFLOAD_FRAME_DATA_SIZE) |
2649 | return; |
2650 | |
2651 | lck_rw_lock_shared(udbinfo.ipi_lock); |
2652 | gencnt = udbinfo.ipi_gencnt; |
2653 | LIST_FOREACH(inp, udbinfo.ipi_listhead, inp_list) { |
2654 | struct socket *so; |
2655 | u_int8_t *data; |
2656 | struct ifnet_keepalive_offload_frame *frame; |
2657 | struct mbuf *m = NULL; |
2658 | |
2659 | if (frame_index >= frames_array_count) |
2660 | break; |
2661 | |
2662 | if (inp->inp_gencnt > gencnt || |
2663 | inp->inp_state == INPCB_STATE_DEAD) |
2664 | continue; |
2665 | |
2666 | if ((so = inp->inp_socket) == NULL || |
2667 | (so->so_state & SS_DEFUNCT)) |
2668 | continue; |
2669 | /* |
2670 | * check for keepalive offload flag without socket |
2671 | * lock to avoid a deadlock |
2672 | */ |
2673 | if (!(inp->inp_flags2 & INP2_KEEPALIVE_OFFLOAD)) { |
2674 | continue; |
2675 | } |
2676 | |
2677 | udp_lock(so, 1, 0); |
2678 | if (!(inp->inp_vflag & (INP_IPV4 | INP_IPV6))) { |
2679 | udp_unlock(so, 1, 0); |
2680 | continue; |
2681 | } |
2682 | if ((inp->inp_vflag & INP_IPV4) && |
2683 | (inp->inp_laddr.s_addr == INADDR_ANY || |
2684 | inp->inp_faddr.s_addr == INADDR_ANY)) { |
2685 | udp_unlock(so, 1, 0); |
2686 | continue; |
2687 | } |
2688 | if ((inp->inp_vflag & INP_IPV6) && |
2689 | (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) || |
2690 | IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))) { |
2691 | udp_unlock(so, 1, 0); |
2692 | continue; |
2693 | } |
2694 | if (inp->inp_lport == 0 || inp->inp_fport == 0) { |
2695 | udp_unlock(so, 1, 0); |
2696 | continue; |
2697 | } |
2698 | if (inp->inp_last_outifp == NULL || |
2699 | inp->inp_last_outifp->if_index != ifp->if_index) { |
2700 | udp_unlock(so, 1, 0); |
2701 | continue; |
2702 | } |
2703 | if ((inp->inp_vflag & INP_IPV4)) { |
2704 | if ((frame_data_offset + sizeof(struct udpiphdr) + |
2705 | inp->inp_keepalive_datalen) > |
2706 | IFNET_KEEPALIVE_OFFLOAD_FRAME_DATA_SIZE) { |
2707 | udp_unlock(so, 1, 0); |
2708 | continue; |
2709 | } |
2710 | if ((sizeof(struct udpiphdr) + |
2711 | inp->inp_keepalive_datalen) > _MHLEN) { |
2712 | udp_unlock(so, 1, 0); |
2713 | continue; |
2714 | } |
2715 | } else { |
2716 | if ((frame_data_offset + sizeof(struct ip6_hdr) + |
2717 | sizeof(struct udphdr) + |
2718 | inp->inp_keepalive_datalen) > |
2719 | IFNET_KEEPALIVE_OFFLOAD_FRAME_DATA_SIZE) { |
2720 | udp_unlock(so, 1, 0); |
2721 | continue; |
2722 | } |
2723 | if ((sizeof(struct ip6_hdr) + sizeof(struct udphdr) + |
2724 | inp->inp_keepalive_datalen) > _MHLEN) { |
2725 | udp_unlock(so, 1, 0); |
2726 | continue; |
2727 | } |
2728 | } |
2729 | MGETHDR(m, M_WAIT, MT_HEADER); |
2730 | if (m == NULL) { |
2731 | udp_unlock(so, 1, 0); |
2732 | continue; |
2733 | } |
2734 | /* |
2735 | * This inp has all the information that is needed to |
2736 | * generate an offload frame. |
2737 | */ |
2738 | if (inp->inp_vflag & INP_IPV4) { |
2739 | struct ip *ip; |
2740 | struct udphdr *udp; |
2741 | |
2742 | frame = &frames_array[frame_index]; |
2743 | frame->length = frame_data_offset + |
2744 | sizeof(struct udpiphdr) + |
2745 | inp->inp_keepalive_datalen; |
2746 | frame->ether_type = |
2747 | IFNET_KEEPALIVE_OFFLOAD_FRAME_ETHERTYPE_IPV4; |
2748 | frame->interval = inp->inp_keepalive_interval; |
2749 | switch (inp->inp_keepalive_type) { |
2750 | case UDP_KEEPALIVE_OFFLOAD_TYPE_AIRPLAY: |
2751 | frame->type = |
2752 | IFNET_KEEPALIVE_OFFLOAD_FRAME_AIRPLAY; |
2753 | break; |
2754 | default: |
2755 | break; |
2756 | } |
2757 | data = mtod(m, u_int8_t *); |
2758 | bzero(data, sizeof(struct udpiphdr)); |
2759 | ip = (__typeof__(ip))(void *)data; |
2760 | udp = (__typeof__(udp))(void *) (data + |
2761 | sizeof(struct ip)); |
2762 | m->m_len = sizeof(struct udpiphdr); |
2763 | data = data + sizeof(struct udpiphdr); |
2764 | if (inp->inp_keepalive_datalen > 0 && |
2765 | inp->inp_keepalive_data != NULL) { |
2766 | bcopy(inp->inp_keepalive_data, data, |
2767 | inp->inp_keepalive_datalen); |
2768 | m->m_len += inp->inp_keepalive_datalen; |
2769 | } |
2770 | m->m_pkthdr.len = m->m_len; |
2771 | |
2772 | ip->ip_v = IPVERSION; |
2773 | ip->ip_hl = (sizeof(struct ip) >> 2); |
2774 | ip->ip_p = IPPROTO_UDP; |
2775 | ip->ip_len = htons(sizeof(struct udpiphdr) + |
2776 | (u_short)inp->inp_keepalive_datalen); |
2777 | ip->ip_ttl = inp->inp_ip_ttl; |
2778 | ip->ip_tos |= (inp->inp_ip_tos & ~IPTOS_ECN_MASK); |
2779 | ip->ip_src = inp->inp_laddr; |
2780 | ip->ip_dst = inp->inp_faddr; |
2781 | ip->ip_sum = in_cksum_hdr_opt(ip); |
2782 | |
2783 | udp->uh_sport = inp->inp_lport; |
2784 | udp->uh_dport = inp->inp_fport; |
2785 | udp->uh_ulen = htons(sizeof(struct udphdr) + |
2786 | (u_short)inp->inp_keepalive_datalen); |
2787 | |
2788 | if (!(inp->inp_flags & INP_UDP_NOCKSUM)) { |
2789 | udp->uh_sum = in_pseudo(ip->ip_src.s_addr, |
2790 | ip->ip_dst.s_addr, |
2791 | htons(sizeof(struct udphdr) + |
2792 | (u_short)inp->inp_keepalive_datalen + |
2793 | IPPROTO_UDP)); |
2794 | m->m_pkthdr.csum_flags = |
2795 | (CSUM_UDP|CSUM_ZERO_INVERT); |
2796 | m->m_pkthdr.csum_data = offsetof(struct udphdr, |
2797 | uh_sum); |
2798 | } |
2799 | m->m_pkthdr.pkt_proto = IPPROTO_UDP; |
2800 | in_delayed_cksum(m); |
2801 | bcopy(m->m_data, frame->data + frame_data_offset, |
2802 | m->m_len); |
2803 | } else { |
2804 | struct ip6_hdr *ip6; |
2805 | struct udphdr *udp6; |
2806 | |
2807 | VERIFY(inp->inp_vflag & INP_IPV6); |
2808 | frame = &frames_array[frame_index]; |
2809 | frame->length = frame_data_offset + |
2810 | sizeof(struct ip6_hdr) + |
2811 | sizeof(struct udphdr) + |
2812 | inp->inp_keepalive_datalen; |
2813 | frame->ether_type = |
2814 | IFNET_KEEPALIVE_OFFLOAD_FRAME_ETHERTYPE_IPV6; |
2815 | frame->interval = inp->inp_keepalive_interval; |
2816 | switch (inp->inp_keepalive_type) { |
2817 | case UDP_KEEPALIVE_OFFLOAD_TYPE_AIRPLAY: |
2818 | frame->type = |
2819 | IFNET_KEEPALIVE_OFFLOAD_FRAME_AIRPLAY; |
2820 | break; |
2821 | default: |
2822 | break; |
2823 | } |
2824 | data = mtod(m, u_int8_t *); |
2825 | bzero(data, sizeof(struct ip6_hdr) + sizeof(struct udphdr)); |
2826 | ip6 = (__typeof__(ip6))(void *)data; |
2827 | udp6 = (__typeof__(udp6))(void *)(data + |
2828 | sizeof(struct ip6_hdr)); |
2829 | m->m_len = sizeof(struct ip6_hdr) + |
2830 | sizeof(struct udphdr); |
2831 | data = data + (sizeof(struct ip6_hdr) + |
2832 | sizeof(struct udphdr)); |
2833 | if (inp->inp_keepalive_datalen > 0 && |
2834 | inp->inp_keepalive_data != NULL) { |
2835 | bcopy(inp->inp_keepalive_data, data, |
2836 | inp->inp_keepalive_datalen); |
2837 | m->m_len += inp->inp_keepalive_datalen; |
2838 | } |
2839 | m->m_pkthdr.len = m->m_len; |
2840 | ip6->ip6_flow = inp->inp_flow & IPV6_FLOWINFO_MASK; |
2841 | ip6->ip6_flow = ip6->ip6_flow & ~IPV6_FLOW_ECN_MASK; |
2842 | ip6->ip6_vfc &= ~IPV6_VERSION_MASK; |
2843 | ip6->ip6_vfc |= IPV6_VERSION; |
2844 | ip6->ip6_nxt = IPPROTO_UDP; |
2845 | ip6->ip6_hlim = ip6_defhlim; |
2846 | ip6->ip6_plen = htons(sizeof(struct udphdr) + |
2847 | (u_short)inp->inp_keepalive_datalen); |
2848 | ip6->ip6_src = inp->in6p_laddr; |
2849 | if (IN6_IS_SCOPE_EMBED(&ip6->ip6_src)) |
2850 | ip6->ip6_src.s6_addr16[1] = 0; |
2851 | |
2852 | ip6->ip6_dst = inp->in6p_faddr; |
2853 | if (IN6_IS_SCOPE_EMBED(&ip6->ip6_dst)) |
2854 | ip6->ip6_dst.s6_addr16[1] = 0; |
2855 | |
2856 | udp6->uh_sport = inp->in6p_lport; |
2857 | udp6->uh_dport = inp->in6p_fport; |
2858 | udp6->uh_ulen = htons(sizeof(struct udphdr) + |
2859 | (u_short)inp->inp_keepalive_datalen); |
2860 | if (!(inp->inp_flags & INP_UDP_NOCKSUM)) { |
2861 | udp6->uh_sum = in6_pseudo(&ip6->ip6_src, |
2862 | &ip6->ip6_dst, |
2863 | htonl(sizeof(struct udphdr) + |
2864 | (u_short)inp->inp_keepalive_datalen + |
2865 | IPPROTO_UDP)); |
2866 | m->m_pkthdr.csum_flags = |
2867 | (CSUM_UDPIPV6|CSUM_ZERO_INVERT); |
2868 | m->m_pkthdr.csum_data = offsetof(struct udphdr, |
2869 | uh_sum); |
2870 | } |
2871 | m->m_pkthdr.pkt_proto = IPPROTO_UDP; |
2872 | in6_delayed_cksum(m); |
2873 | bcopy(m->m_data, frame->data + frame_data_offset, |
2874 | m->m_len); |
2875 | } |
2876 | if (m != NULL) { |
2877 | m_freem(m); |
2878 | m = NULL; |
2879 | } |
2880 | frame_index++; |
2881 | udp_unlock(so, 1, 0); |
2882 | } |
2883 | lck_rw_done(udbinfo.ipi_lock); |
2884 | *used_frames_count = frame_index; |
2885 | } |
2886 | |