1 | /* |
2 | * Copyright (c) 2003-2018 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 | /* |
30 | * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. |
31 | * All rights reserved. |
32 | * |
33 | * Redistribution and use in source and binary forms, with or without |
34 | * modification, are permitted provided that the following conditions |
35 | * are met: |
36 | * 1. Redistributions of source code must retain the above copyright |
37 | * notice, this list of conditions and the following disclaimer. |
38 | * 2. Redistributions in binary form must reproduce the above copyright |
39 | * notice, this list of conditions and the following disclaimer in the |
40 | * documentation and/or other materials provided with the distribution. |
41 | * 3. Neither the name of the project nor the names of its contributors |
42 | * may be used to endorse or promote products derived from this software |
43 | * without specific prior written permission. |
44 | * |
45 | * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND |
46 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
47 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
48 | * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE |
49 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
50 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
51 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
52 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
53 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
54 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
55 | * SUCH DAMAGE. |
56 | */ |
57 | |
58 | /* |
59 | * Copyright (c) 1982, 1986, 1988, 1993 |
60 | * The Regents of the University of California. All rights reserved. |
61 | * |
62 | * Redistribution and use in source and binary forms, with or without |
63 | * modification, are permitted provided that the following conditions |
64 | * are met: |
65 | * 1. Redistributions of source code must retain the above copyright |
66 | * notice, this list of conditions and the following disclaimer. |
67 | * 2. Redistributions in binary form must reproduce the above copyright |
68 | * notice, this list of conditions and the following disclaimer in the |
69 | * documentation and/or other materials provided with the distribution. |
70 | * 3. All advertising materials mentioning features or use of this software |
71 | * must display the following acknowledgement: |
72 | * This product includes software developed by the University of |
73 | * California, Berkeley and its contributors. |
74 | * 4. Neither the name of the University nor the names of its contributors |
75 | * may be used to endorse or promote products derived from this software |
76 | * without specific prior written permission. |
77 | * |
78 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
79 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
80 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
81 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
82 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
83 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
84 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
85 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
86 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
87 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
88 | * SUCH DAMAGE. |
89 | * |
90 | * @(#)ip_input.c 8.2 (Berkeley) 1/4/94 |
91 | */ |
92 | |
93 | #include <sys/param.h> |
94 | #include <sys/systm.h> |
95 | #include <sys/malloc.h> |
96 | #include <sys/mbuf.h> |
97 | #include <sys/domain.h> |
98 | #include <sys/protosw.h> |
99 | #include <sys/socket.h> |
100 | #include <sys/socketvar.h> |
101 | #include <sys/errno.h> |
102 | #include <sys/time.h> |
103 | #include <sys/kernel.h> |
104 | #include <sys/syslog.h> |
105 | #include <sys/sysctl.h> |
106 | #include <sys/proc.h> |
107 | #include <sys/kauth.h> |
108 | #include <sys/mcache.h> |
109 | |
110 | #include <mach/mach_time.h> |
111 | #include <mach/sdt.h> |
112 | #include <pexpert/pexpert.h> |
113 | #include <dev/random/randomdev.h> |
114 | |
115 | #include <net/if.h> |
116 | #include <net/if_var.h> |
117 | #include <net/if_types.h> |
118 | #include <net/if_dl.h> |
119 | #include <net/route.h> |
120 | #include <net/kpi_protocol.h> |
121 | #include <net/ntstat.h> |
122 | #include <net/init.h> |
123 | #include <net/net_osdep.h> |
124 | #include <net/net_perf.h> |
125 | |
126 | #include <netinet/in.h> |
127 | #include <netinet/in_systm.h> |
128 | #if INET |
129 | #include <netinet/ip.h> |
130 | #include <netinet/ip_icmp.h> |
131 | #endif /* INET */ |
132 | #include <netinet/kpi_ipfilter_var.h> |
133 | #include <netinet/ip6.h> |
134 | #include <netinet6/in6_var.h> |
135 | #include <netinet6/ip6_var.h> |
136 | #include <netinet/in_pcb.h> |
137 | #include <netinet/icmp6.h> |
138 | #include <netinet6/in6_ifattach.h> |
139 | #include <netinet6/nd6.h> |
140 | #include <netinet6/scope6_var.h> |
141 | #include <netinet6/ip6protosw.h> |
142 | |
143 | #if IPSEC |
144 | #include <netinet6/ipsec.h> |
145 | #include <netinet6/ipsec6.h> |
146 | extern int ipsec_bypass; |
147 | #endif /* IPSEC */ |
148 | |
149 | #if DUMMYNET |
150 | #include <netinet/ip_fw.h> |
151 | #include <netinet/ip_dummynet.h> |
152 | #endif /* DUMMYNET */ |
153 | |
154 | /* we need it for NLOOP. */ |
155 | #include "loop.h" |
156 | |
157 | #if PF |
158 | #include <net/pfvar.h> |
159 | #endif /* PF */ |
160 | |
161 | struct ip6protosw *ip6_protox[IPPROTO_MAX]; |
162 | |
163 | static lck_grp_attr_t *in6_ifaddr_rwlock_grp_attr; |
164 | static lck_grp_t *in6_ifaddr_rwlock_grp; |
165 | static lck_attr_t *in6_ifaddr_rwlock_attr; |
166 | decl_lck_rw_data(, in6_ifaddr_rwlock); |
167 | |
168 | /* Protected by in6_ifaddr_rwlock */ |
169 | struct in6_ifaddr *in6_ifaddrs = NULL; |
170 | |
171 | #define IN6_IFSTAT_REQUIRE_ALIGNED_64(f) \ |
172 | _CASSERT(!(offsetof(struct in6_ifstat, f) % sizeof (uint64_t))) |
173 | |
174 | #define ICMP6_IFSTAT_REQUIRE_ALIGNED_64(f) \ |
175 | _CASSERT(!(offsetof(struct icmp6_ifstat, f) % sizeof (uint64_t))) |
176 | |
177 | struct ip6stat ip6stat; |
178 | |
179 | decl_lck_mtx_data(, proxy6_lock); |
180 | decl_lck_mtx_data(static, dad6_mutex_data); |
181 | decl_lck_mtx_data(static, nd6_mutex_data); |
182 | decl_lck_mtx_data(static, prefix6_mutex_data); |
183 | lck_mtx_t *dad6_mutex = &dad6_mutex_data; |
184 | lck_mtx_t *nd6_mutex = &nd6_mutex_data; |
185 | lck_mtx_t *prefix6_mutex = &prefix6_mutex_data; |
186 | #ifdef ENABLE_ADDRSEL |
187 | decl_lck_mtx_data(static, addrsel_mutex_data); |
188 | lck_mtx_t *addrsel_mutex = &addrsel_mutex_data; |
189 | #endif |
190 | static lck_attr_t *ip6_mutex_attr; |
191 | static lck_grp_t *ip6_mutex_grp; |
192 | static lck_grp_attr_t *ip6_mutex_grp_attr; |
193 | |
194 | extern int loopattach_done; |
195 | extern void addrsel_policy_init(void); |
196 | |
197 | static int sysctl_reset_ip6_input_stats SYSCTL_HANDLER_ARGS; |
198 | static int sysctl_ip6_input_measure_bins SYSCTL_HANDLER_ARGS; |
199 | static int sysctl_ip6_input_getperf SYSCTL_HANDLER_ARGS; |
200 | static void ip6_init_delayed(void); |
201 | static int ip6_hopopts_input(u_int32_t *, u_int32_t *, struct mbuf **, int *); |
202 | |
203 | #if NSTF |
204 | extern void stfattach(void); |
205 | #endif /* NSTF */ |
206 | |
207 | SYSCTL_DECL(_net_inet6_ip6); |
208 | |
209 | static uint32_t ip6_adj_clear_hwcksum = 0; |
210 | SYSCTL_UINT(_net_inet6_ip6, OID_AUTO, adj_clear_hwcksum, |
211 | CTLFLAG_RW | CTLFLAG_LOCKED, &ip6_adj_clear_hwcksum, 0, |
212 | "Invalidate hwcksum info when adjusting length" ); |
213 | |
214 | static uint32_t ip6_adj_partial_sum = 1; |
215 | SYSCTL_UINT(_net_inet6_ip6, OID_AUTO, adj_partial_sum, |
216 | CTLFLAG_RW | CTLFLAG_LOCKED, &ip6_adj_partial_sum, 0, |
217 | "Perform partial sum adjustment of trailing bytes at IP layer" ); |
218 | |
219 | static int ip6_input_measure = 0; |
220 | SYSCTL_PROC(_net_inet6_ip6, OID_AUTO, input_perf, |
221 | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED, |
222 | &ip6_input_measure, 0, sysctl_reset_ip6_input_stats, "I" , "Do time measurement" ); |
223 | |
224 | static uint64_t ip6_input_measure_bins = 0; |
225 | SYSCTL_PROC(_net_inet6_ip6, OID_AUTO, input_perf_bins, |
226 | CTLTYPE_QUAD | CTLFLAG_RW | CTLFLAG_LOCKED, &ip6_input_measure_bins, 0, |
227 | sysctl_ip6_input_measure_bins, "I" , |
228 | "bins for chaining performance data histogram" ); |
229 | |
230 | static net_perf_t net_perf; |
231 | SYSCTL_PROC(_net_inet6_ip6, OID_AUTO, input_perf_data, |
232 | CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_LOCKED, |
233 | 0, 0, sysctl_ip6_input_getperf, "S,net_perf" , |
234 | "IP6 input performance data (struct net_perf, net/net_perf.h)" ); |
235 | |
236 | /* |
237 | * On platforms which require strict alignment (currently for anything but |
238 | * i386 or x86_64), check if the IP header pointer is 32-bit aligned; if not, |
239 | * copy the contents of the mbuf chain into a new chain, and free the original |
240 | * one. Create some head room in the first mbuf of the new chain, in case |
241 | * it's needed later on. |
242 | * |
243 | * RFC 2460 says that IPv6 headers are 64-bit aligned, but network interfaces |
244 | * mostly align to 32-bit boundaries. Care should be taken never to use 64-bit |
245 | * load/store operations on the fields in IPv6 headers. |
246 | */ |
247 | #if defined(__i386__) || defined(__x86_64__) |
248 | #define IP6_HDR_ALIGNMENT_FIXUP(_m, _ifp, _action) do { } while (0) |
249 | #else /* !__i386__ && !__x86_64__ */ |
250 | #define IP6_HDR_ALIGNMENT_FIXUP(_m, _ifp, _action) do { \ |
251 | if (!IP6_HDR_ALIGNED_P(mtod(_m, caddr_t))) { \ |
252 | struct mbuf *_n; \ |
253 | struct ifnet *__ifp = (_ifp); \ |
254 | atomic_add_64(&(__ifp)->if_alignerrs, 1); \ |
255 | if (((_m)->m_flags & M_PKTHDR) && \ |
256 | (_m)->m_pkthdr.pkt_hdr != NULL) \ |
257 | (_m)->m_pkthdr.pkt_hdr = NULL; \ |
258 | _n = m_defrag_offset(_m, max_linkhdr, M_NOWAIT); \ |
259 | if (_n == NULL) { \ |
260 | ip6stat.ip6s_toosmall++; \ |
261 | m_freem(_m); \ |
262 | (_m) = NULL; \ |
263 | _action; \ |
264 | } else { \ |
265 | VERIFY(_n != (_m)); \ |
266 | (_m) = _n; \ |
267 | } \ |
268 | } \ |
269 | } while (0) |
270 | #endif /* !__i386__ && !__x86_64__ */ |
271 | |
272 | static void |
273 | ip6_proto_input(protocol_family_t protocol, mbuf_t packet) |
274 | { |
275 | #pragma unused(protocol) |
276 | #if INET |
277 | struct timeval start_tv; |
278 | if (ip6_input_measure) |
279 | net_perf_start_time(&net_perf, &start_tv); |
280 | #endif /* INET */ |
281 | ip6_input(packet); |
282 | #if INET |
283 | if (ip6_input_measure) { |
284 | net_perf_measure_time(&net_perf, &start_tv, 1); |
285 | net_perf_histogram(&net_perf, 1); |
286 | } |
287 | #endif /* INET */ |
288 | } |
289 | |
290 | /* |
291 | * IP6 initialization: fill in IP6 protocol switch table. |
292 | * All protocols not implemented in kernel go to raw IP6 protocol handler. |
293 | */ |
294 | void |
295 | ip6_init(struct ip6protosw *pp, struct domain *dp) |
296 | { |
297 | static int ip6_initialized = 0; |
298 | struct protosw *pr; |
299 | struct timeval tv; |
300 | int i; |
301 | domain_unguard_t unguard; |
302 | |
303 | domain_proto_mtx_lock_assert_held(); |
304 | VERIFY((pp->pr_flags & (PR_INITIALIZED|PR_ATTACHED)) == PR_ATTACHED); |
305 | |
306 | _CASSERT((sizeof (struct ip6_hdr) + |
307 | sizeof (struct icmp6_hdr)) <= _MHLEN); |
308 | |
309 | if (ip6_initialized) |
310 | return; |
311 | ip6_initialized = 1; |
312 | |
313 | eventhandler_lists_ctxt_init(&in6_evhdlr_ctxt); |
314 | (void)EVENTHANDLER_REGISTER(&in6_evhdlr_ctxt, in6_event, |
315 | in6_eventhdlr_callback, eventhandler_entry_dummy_arg, |
316 | EVENTHANDLER_PRI_ANY); |
317 | |
318 | eventhandler_lists_ctxt_init(&in6_clat46_evhdlr_ctxt); |
319 | (void)EVENTHANDLER_REGISTER(&in6_clat46_evhdlr_ctxt, in6_clat46_event, |
320 | in6_clat46_eventhdlr_callback, eventhandler_entry_dummy_arg, |
321 | EVENTHANDLER_PRI_ANY); |
322 | |
323 | for (i = 0; i < IN6_EVENT_MAX; i++) |
324 | VERIFY(in6_event2kev_array[i].in6_event_code == i); |
325 | |
326 | pr = pffindproto_locked(PF_INET6, IPPROTO_RAW, SOCK_RAW); |
327 | if (pr == NULL) { |
328 | panic("%s: Unable to find [PF_INET6,IPPROTO_RAW,SOCK_RAW]\n" , |
329 | __func__); |
330 | /* NOTREACHED */ |
331 | } |
332 | |
333 | /* Initialize the entire ip6_protox[] array to IPPROTO_RAW. */ |
334 | for (i = 0; i < IPPROTO_MAX; i++) |
335 | ip6_protox[i] = (struct ip6protosw *)pr; |
336 | /* |
337 | * Cycle through IP protocols and put them into the appropriate place |
338 | * in ip6_protox[], skipping protocols IPPROTO_{IP,RAW}. |
339 | */ |
340 | VERIFY(dp == inet6domain && dp->dom_family == PF_INET6); |
341 | TAILQ_FOREACH(pr, &dp->dom_protosw, pr_entry) { |
342 | VERIFY(pr->pr_domain == dp); |
343 | if (pr->pr_protocol != 0 && pr->pr_protocol != IPPROTO_RAW) { |
344 | /* Be careful to only index valid IP protocols. */ |
345 | if (pr->pr_protocol < IPPROTO_MAX) |
346 | ip6_protox[pr->pr_protocol] = |
347 | (struct ip6protosw *)pr; |
348 | } |
349 | } |
350 | |
351 | ip6_mutex_grp_attr = lck_grp_attr_alloc_init(); |
352 | |
353 | ip6_mutex_grp = lck_grp_alloc_init("ip6" , ip6_mutex_grp_attr); |
354 | ip6_mutex_attr = lck_attr_alloc_init(); |
355 | |
356 | lck_mtx_init(dad6_mutex, ip6_mutex_grp, ip6_mutex_attr); |
357 | lck_mtx_init(nd6_mutex, ip6_mutex_grp, ip6_mutex_attr); |
358 | lck_mtx_init(prefix6_mutex, ip6_mutex_grp, ip6_mutex_attr); |
359 | scope6_init(ip6_mutex_grp, ip6_mutex_attr); |
360 | |
361 | #ifdef ENABLE_ADDRSEL |
362 | lck_mtx_init(addrsel_mutex, ip6_mutex_grp, ip6_mutex_attr); |
363 | #endif |
364 | |
365 | lck_mtx_init(&proxy6_lock, ip6_mutex_grp, ip6_mutex_attr); |
366 | |
367 | in6_ifaddr_rwlock_grp_attr = lck_grp_attr_alloc_init(); |
368 | in6_ifaddr_rwlock_grp = lck_grp_alloc_init("in6_ifaddr_rwlock" , |
369 | in6_ifaddr_rwlock_grp_attr); |
370 | in6_ifaddr_rwlock_attr = lck_attr_alloc_init(); |
371 | lck_rw_init(&in6_ifaddr_rwlock, in6_ifaddr_rwlock_grp, |
372 | in6_ifaddr_rwlock_attr); |
373 | |
374 | IN6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_receive); |
375 | IN6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_hdrerr); |
376 | IN6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_toobig); |
377 | IN6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_noroute); |
378 | IN6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_addrerr); |
379 | IN6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_protounknown); |
380 | IN6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_truncated); |
381 | IN6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_discard); |
382 | IN6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_deliver); |
383 | IN6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_out_forward); |
384 | IN6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_out_request); |
385 | IN6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_out_discard); |
386 | IN6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_out_fragok); |
387 | IN6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_out_fragfail); |
388 | IN6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_out_fragcreat); |
389 | IN6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_reass_reqd); |
390 | IN6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_reass_ok); |
391 | IN6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_reass_fail); |
392 | IN6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_mcast); |
393 | IN6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_out_mcast); |
394 | |
395 | ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_msg); |
396 | ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_error); |
397 | ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_dstunreach); |
398 | ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_adminprohib); |
399 | ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_timeexceed); |
400 | ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_paramprob); |
401 | ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_pkttoobig); |
402 | ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_echo); |
403 | ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_echoreply); |
404 | ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_routersolicit); |
405 | ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_routeradvert); |
406 | ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_neighborsolicit); |
407 | ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_neighboradvert); |
408 | ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_redirect); |
409 | ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_mldquery); |
410 | ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_mldreport); |
411 | ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_mlddone); |
412 | |
413 | ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_out_msg); |
414 | ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_out_error); |
415 | ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_out_dstunreach); |
416 | ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_out_adminprohib); |
417 | ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_out_timeexceed); |
418 | ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_out_paramprob); |
419 | ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_out_pkttoobig); |
420 | ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_out_echo); |
421 | ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_out_echoreply); |
422 | ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_out_routersolicit); |
423 | ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_out_routeradvert); |
424 | ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_out_neighborsolicit); |
425 | ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_out_neighboradvert); |
426 | ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_out_redirect); |
427 | ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_out_mldquery); |
428 | ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_out_mldreport); |
429 | ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_out_mlddone); |
430 | |
431 | getmicrotime(&tv); |
432 | ip6_desync_factor = |
433 | (RandomULong() ^ tv.tv_usec) % MAX_TEMP_DESYNC_FACTOR; |
434 | |
435 | in6_ifaddr_init(); |
436 | ip6_moptions_init(); |
437 | nd6_init(); |
438 | frag6_init(); |
439 | icmp6_init(NULL, dp); |
440 | addrsel_policy_init(); |
441 | |
442 | /* |
443 | * P2P interfaces often route the local address to the loopback |
444 | * interface. At this point, lo0 hasn't been initialized yet, which |
445 | * means that we need to delay the IPv6 configuration of lo0. |
446 | */ |
447 | net_init_add(ip6_init_delayed); |
448 | |
449 | unguard = domain_unguard_deploy(); |
450 | i = proto_register_input(PF_INET6, ip6_proto_input, NULL, 0); |
451 | if (i != 0) { |
452 | panic("%s: failed to register PF_INET6 protocol: %d\n" , |
453 | __func__, i); |
454 | /* NOTREACHED */ |
455 | } |
456 | domain_unguard_release(unguard); |
457 | } |
458 | |
459 | static void |
460 | ip6_init_delayed(void) |
461 | { |
462 | (void) in6_ifattach_prelim(lo_ifp); |
463 | |
464 | /* timer for regeneranation of temporary addresses randomize ID */ |
465 | timeout(in6_tmpaddrtimer, NULL, |
466 | (ip6_temp_preferred_lifetime - ip6_desync_factor - |
467 | ip6_temp_regen_advance) * hz); |
468 | |
469 | #if NSTF |
470 | stfattach(); |
471 | #endif /* NSTF */ |
472 | } |
473 | |
474 | static void |
475 | ip6_input_adjust(struct mbuf *m, struct ip6_hdr *ip6, uint32_t plen, |
476 | struct ifnet *inifp) |
477 | { |
478 | boolean_t adjust = TRUE; |
479 | uint32_t tot_len = sizeof (*ip6) + plen; |
480 | |
481 | ASSERT(m_pktlen(m) > tot_len); |
482 | |
483 | /* |
484 | * Invalidate hardware checksum info if ip6_adj_clear_hwcksum |
485 | * is set; useful to handle buggy drivers. Note that this |
486 | * should not be enabled by default, as we may get here due |
487 | * to link-layer padding. |
488 | */ |
489 | if (ip6_adj_clear_hwcksum && |
490 | (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) && |
491 | !(inifp->if_flags & IFF_LOOPBACK) && |
492 | !(m->m_pkthdr.pkt_flags & PKTF_LOOP)) { |
493 | m->m_pkthdr.csum_flags &= ~CSUM_DATA_VALID; |
494 | m->m_pkthdr.csum_data = 0; |
495 | ip6stat.ip6s_adj_hwcsum_clr++; |
496 | } |
497 | |
498 | /* |
499 | * If partial checksum information is available, subtract |
500 | * out the partial sum of postpended extraneous bytes, and |
501 | * update the checksum metadata accordingly. By doing it |
502 | * here, the upper layer transport only needs to adjust any |
503 | * prepended extraneous bytes (else it will do both.) |
504 | */ |
505 | if (ip6_adj_partial_sum && |
506 | (m->m_pkthdr.csum_flags & (CSUM_DATA_VALID|CSUM_PARTIAL)) == |
507 | (CSUM_DATA_VALID|CSUM_PARTIAL)) { |
508 | m->m_pkthdr.csum_rx_val = m_adj_sum16(m, |
509 | m->m_pkthdr.csum_rx_start, m->m_pkthdr.csum_rx_start, |
510 | (tot_len - m->m_pkthdr.csum_rx_start), |
511 | m->m_pkthdr.csum_rx_val); |
512 | } else if ((m->m_pkthdr.csum_flags & |
513 | (CSUM_DATA_VALID|CSUM_PARTIAL)) == |
514 | (CSUM_DATA_VALID|CSUM_PARTIAL)) { |
515 | /* |
516 | * If packet has partial checksum info and we decided not |
517 | * to subtract the partial sum of postpended extraneous |
518 | * bytes here (not the default case), leave that work to |
519 | * be handled by the other layers. For now, only TCP, UDP |
520 | * layers are capable of dealing with this. For all other |
521 | * protocols (including fragments), trim and ditch the |
522 | * partial sum as those layers might not implement partial |
523 | * checksumming (or adjustment) at all. |
524 | */ |
525 | if (ip6->ip6_nxt == IPPROTO_TCP || |
526 | ip6->ip6_nxt == IPPROTO_UDP) { |
527 | adjust = FALSE; |
528 | } else { |
529 | m->m_pkthdr.csum_flags &= ~CSUM_DATA_VALID; |
530 | m->m_pkthdr.csum_data = 0; |
531 | ip6stat.ip6s_adj_hwcsum_clr++; |
532 | } |
533 | } |
534 | |
535 | if (adjust) { |
536 | ip6stat.ip6s_adj++; |
537 | if (m->m_len == m->m_pkthdr.len) { |
538 | m->m_len = tot_len; |
539 | m->m_pkthdr.len = tot_len; |
540 | } else { |
541 | m_adj(m, tot_len - m->m_pkthdr.len); |
542 | } |
543 | } |
544 | } |
545 | |
546 | void |
547 | ip6_input(struct mbuf *m) |
548 | { |
549 | struct ip6_hdr *ip6; |
550 | int off = sizeof (struct ip6_hdr), nest; |
551 | u_int32_t plen; |
552 | u_int32_t rtalert = ~0; |
553 | int nxt = 0, ours = 0; |
554 | struct ifnet *inifp, *deliverifp = NULL; |
555 | ipfilter_t inject_ipfref = NULL; |
556 | int seen = 1; |
557 | struct in6_ifaddr *ia6 = NULL; |
558 | struct sockaddr_in6 *dst6; |
559 | #if DUMMYNET |
560 | struct m_tag *tag; |
561 | #endif /* DUMMYNET */ |
562 | struct { |
563 | struct route_in6 rin6; |
564 | #if DUMMYNET |
565 | struct ip_fw_args args; |
566 | #endif /* DUMMYNET */ |
567 | } ip6ibz; |
568 | #define rin6 ip6ibz.rin6 |
569 | #define args ip6ibz.args |
570 | |
571 | /* zero out {rin6, args} */ |
572 | bzero(&ip6ibz, sizeof (ip6ibz)); |
573 | |
574 | /* |
575 | * Check if the packet we received is valid after interface filter |
576 | * processing |
577 | */ |
578 | MBUF_INPUT_CHECK(m, m->m_pkthdr.rcvif); |
579 | inifp = m->m_pkthdr.rcvif; |
580 | VERIFY(inifp != NULL); |
581 | |
582 | /* Perform IP header alignment fixup, if needed */ |
583 | IP6_HDR_ALIGNMENT_FIXUP(m, inifp, return); |
584 | |
585 | m->m_pkthdr.pkt_flags &= ~PKTF_FORWARDED; |
586 | #if IPSEC |
587 | /* |
588 | * should the inner packet be considered authentic? |
589 | * see comment in ah4_input(). |
590 | */ |
591 | m->m_flags &= ~M_AUTHIPHDR; |
592 | m->m_flags &= ~M_AUTHIPDGM; |
593 | #endif /* IPSEC */ |
594 | |
595 | /* |
596 | * make sure we don't have onion peering information into m_aux. |
597 | */ |
598 | ip6_delaux(m); |
599 | |
600 | #if DUMMYNET |
601 | if ((tag = m_tag_locate(m, KERNEL_MODULE_TAG_ID, |
602 | KERNEL_TAG_TYPE_DUMMYNET, NULL)) != NULL) { |
603 | struct dn_pkt_tag *dn_tag; |
604 | |
605 | dn_tag = (struct dn_pkt_tag *)(tag+1); |
606 | |
607 | args.fwa_pf_rule = dn_tag->dn_pf_rule; |
608 | |
609 | m_tag_delete(m, tag); |
610 | } |
611 | |
612 | if (args.fwa_pf_rule) { |
613 | ip6 = mtod(m, struct ip6_hdr *); /* In case PF got disabled */ |
614 | |
615 | goto check_with_pf; |
616 | } |
617 | #endif /* DUMMYNET */ |
618 | |
619 | /* |
620 | * No need to proccess packet twice if we've already seen it. |
621 | */ |
622 | inject_ipfref = ipf_get_inject_filter(m); |
623 | if (inject_ipfref != NULL) { |
624 | ip6 = mtod(m, struct ip6_hdr *); |
625 | nxt = ip6->ip6_nxt; |
626 | seen = 0; |
627 | goto injectit; |
628 | } else { |
629 | seen = 1; |
630 | } |
631 | |
632 | /* |
633 | * mbuf statistics |
634 | */ |
635 | if (m->m_flags & M_EXT) { |
636 | if (m->m_next != NULL) |
637 | ip6stat.ip6s_mext2m++; |
638 | else |
639 | ip6stat.ip6s_mext1++; |
640 | } else { |
641 | #define M2MMAX (sizeof (ip6stat.ip6s_m2m) / sizeof (ip6stat.ip6s_m2m[0])) |
642 | if (m->m_next != NULL) { |
643 | if (m->m_pkthdr.pkt_flags & PKTF_LOOP) { |
644 | /* XXX */ |
645 | ip6stat.ip6s_m2m[ifnet_index(lo_ifp)]++; |
646 | } else if (inifp->if_index < M2MMAX) { |
647 | ip6stat.ip6s_m2m[inifp->if_index]++; |
648 | } else { |
649 | ip6stat.ip6s_m2m[0]++; |
650 | } |
651 | } else { |
652 | ip6stat.ip6s_m1++; |
653 | } |
654 | #undef M2MMAX |
655 | } |
656 | |
657 | /* |
658 | * Drop the packet if IPv6 operation is disabled on the interface. |
659 | */ |
660 | if (inifp->if_eflags & IFEF_IPV6_DISABLED) |
661 | goto bad; |
662 | |
663 | in6_ifstat_inc_na(inifp, ifs6_in_receive); |
664 | ip6stat.ip6s_total++; |
665 | |
666 | /* |
667 | * L2 bridge code and some other code can return mbuf chain |
668 | * that does not conform to KAME requirement. too bad. |
669 | * XXX: fails to join if interface MTU > MCLBYTES. jumbogram? |
670 | */ |
671 | if (m->m_next != NULL && m->m_pkthdr.len < MCLBYTES) { |
672 | struct mbuf *n; |
673 | |
674 | MGETHDR(n, M_DONTWAIT, MT_HEADER); /* MAC-OK */ |
675 | if (n) |
676 | M_COPY_PKTHDR(n, m); |
677 | if (n && m->m_pkthdr.len > MHLEN) { |
678 | MCLGET(n, M_DONTWAIT); |
679 | if ((n->m_flags & M_EXT) == 0) { |
680 | m_freem(n); |
681 | n = NULL; |
682 | } |
683 | } |
684 | if (n == NULL) |
685 | goto bad; |
686 | |
687 | m_copydata(m, 0, m->m_pkthdr.len, mtod(n, caddr_t)); |
688 | n->m_len = m->m_pkthdr.len; |
689 | m_freem(m); |
690 | m = n; |
691 | } |
692 | IP6_EXTHDR_CHECK(m, 0, sizeof (struct ip6_hdr), { goto done; }); |
693 | |
694 | if (m->m_len < sizeof (struct ip6_hdr)) { |
695 | if ((m = m_pullup(m, sizeof (struct ip6_hdr))) == 0) { |
696 | ip6stat.ip6s_toosmall++; |
697 | in6_ifstat_inc(inifp, ifs6_in_hdrerr); |
698 | goto done; |
699 | } |
700 | } |
701 | |
702 | ip6 = mtod(m, struct ip6_hdr *); |
703 | |
704 | if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { |
705 | ip6stat.ip6s_badvers++; |
706 | in6_ifstat_inc(inifp, ifs6_in_hdrerr); |
707 | goto bad; |
708 | } |
709 | |
710 | ip6stat.ip6s_nxthist[ip6->ip6_nxt]++; |
711 | |
712 | /* |
713 | * Check against address spoofing/corruption. |
714 | */ |
715 | if (!(m->m_pkthdr.pkt_flags & PKTF_LOOP) && |
716 | IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src)) { |
717 | ip6stat.ip6s_badscope++; |
718 | in6_ifstat_inc(inifp, ifs6_in_addrerr); |
719 | goto bad; |
720 | } |
721 | if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) || |
722 | IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) { |
723 | /* |
724 | * XXX: "badscope" is not very suitable for a multicast source. |
725 | */ |
726 | ip6stat.ip6s_badscope++; |
727 | in6_ifstat_inc(inifp, ifs6_in_addrerr); |
728 | goto bad; |
729 | } |
730 | if (IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) && |
731 | !(m->m_pkthdr.pkt_flags & PKTF_LOOP)) { |
732 | /* |
733 | * In this case, the packet should come from the loopback |
734 | * interface. However, we cannot just check the if_flags, |
735 | * because ip6_mloopback() passes the "actual" interface |
736 | * as the outgoing/incoming interface. |
737 | */ |
738 | ip6stat.ip6s_badscope++; |
739 | in6_ifstat_inc(inifp, ifs6_in_addrerr); |
740 | goto bad; |
741 | } |
742 | |
743 | /* |
744 | * The following check is not documented in specs. A malicious |
745 | * party may be able to use IPv4 mapped addr to confuse tcp/udp stack |
746 | * and bypass security checks (act as if it was from 127.0.0.1 by using |
747 | * IPv6 src ::ffff:127.0.0.1). Be cautious. |
748 | * |
749 | * This check chokes if we are in an SIIT cloud. As none of BSDs |
750 | * support IPv4-less kernel compilation, we cannot support SIIT |
751 | * environment at all. So, it makes more sense for us to reject any |
752 | * malicious packets for non-SIIT environment, than try to do a |
753 | * partial support for SIIT environment. |
754 | */ |
755 | if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || |
756 | IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { |
757 | ip6stat.ip6s_badscope++; |
758 | in6_ifstat_inc(inifp, ifs6_in_addrerr); |
759 | goto bad; |
760 | } |
761 | #if 0 |
762 | /* |
763 | * Reject packets with IPv4 compatible addresses (auto tunnel). |
764 | * |
765 | * The code forbids auto tunnel relay case in RFC1933 (the check is |
766 | * stronger than RFC1933). We may want to re-enable it if mech-xx |
767 | * is revised to forbid relaying case. |
768 | */ |
769 | if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) || |
770 | IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) { |
771 | ip6stat.ip6s_badscope++; |
772 | in6_ifstat_inc(inifp, ifs6_in_addrerr); |
773 | goto bad; |
774 | } |
775 | #endif |
776 | |
777 | /* |
778 | * Naively assume we can attribute inbound data to the route we would |
779 | * use to send to this destination. Asymetric routing breaks this |
780 | * assumption, but it still allows us to account for traffic from |
781 | * a remote node in the routing table. |
782 | * this has a very significant performance impact so we bypass |
783 | * if nstat_collect is disabled. We may also bypass if the |
784 | * protocol is tcp in the future because tcp will have a route that |
785 | * we can use to attribute the data to. That does mean we would not |
786 | * account for forwarded tcp traffic. |
787 | */ |
788 | if (nstat_collect) { |
789 | struct rtentry *rte = |
790 | ifnet_cached_rtlookup_inet6(inifp, &ip6->ip6_src); |
791 | if (rte != NULL) { |
792 | nstat_route_rx(rte, 1, m->m_pkthdr.len, 0); |
793 | rtfree(rte); |
794 | } |
795 | } |
796 | |
797 | /* for consistency */ |
798 | m->m_pkthdr.pkt_proto = ip6->ip6_nxt; |
799 | |
800 | #if DUMMYNET |
801 | check_with_pf: |
802 | #endif /* DUMMYNET */ |
803 | #if PF |
804 | /* Invoke inbound packet filter */ |
805 | if (PF_IS_ENABLED) { |
806 | int error; |
807 | #if DUMMYNET |
808 | error = pf_af_hook(inifp, NULL, &m, AF_INET6, TRUE, &args); |
809 | #else /* !DUMMYNET */ |
810 | error = pf_af_hook(inifp, NULL, &m, AF_INET6, TRUE, NULL); |
811 | #endif /* !DUMMYNET */ |
812 | if (error != 0 || m == NULL) { |
813 | if (m != NULL) { |
814 | panic("%s: unexpected packet %p\n" , |
815 | __func__, m); |
816 | /* NOTREACHED */ |
817 | } |
818 | /* Already freed by callee */ |
819 | goto done; |
820 | } |
821 | ip6 = mtod(m, struct ip6_hdr *); |
822 | } |
823 | #endif /* PF */ |
824 | |
825 | /* drop packets if interface ID portion is already filled */ |
826 | if (!(inifp->if_flags & IFF_LOOPBACK) && |
827 | !(m->m_pkthdr.pkt_flags & PKTF_LOOP)) { |
828 | if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src) && |
829 | ip6->ip6_src.s6_addr16[1]) { |
830 | ip6stat.ip6s_badscope++; |
831 | goto bad; |
832 | } |
833 | if (IN6_IS_SCOPE_EMBED(&ip6->ip6_dst) && |
834 | ip6->ip6_dst.s6_addr16[1]) { |
835 | ip6stat.ip6s_badscope++; |
836 | goto bad; |
837 | } |
838 | } |
839 | |
840 | if (m->m_pkthdr.pkt_flags & PKTF_IFAINFO) { |
841 | if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) |
842 | ip6->ip6_src.s6_addr16[1] = |
843 | htons(m->m_pkthdr.src_ifindex); |
844 | if (IN6_IS_SCOPE_EMBED(&ip6->ip6_dst)) |
845 | ip6->ip6_dst.s6_addr16[1] = |
846 | htons(m->m_pkthdr.dst_ifindex); |
847 | } else { |
848 | if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) |
849 | ip6->ip6_src.s6_addr16[1] = htons(inifp->if_index); |
850 | if (IN6_IS_SCOPE_EMBED(&ip6->ip6_dst)) |
851 | ip6->ip6_dst.s6_addr16[1] = htons(inifp->if_index); |
852 | } |
853 | |
854 | /* |
855 | * Multicast check |
856 | */ |
857 | if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { |
858 | struct in6_multi *in6m = NULL; |
859 | |
860 | in6_ifstat_inc_na(inifp, ifs6_in_mcast); |
861 | /* |
862 | * See if we belong to the destination multicast group on the |
863 | * arrival interface. |
864 | */ |
865 | in6_multihead_lock_shared(); |
866 | IN6_LOOKUP_MULTI(&ip6->ip6_dst, inifp, in6m); |
867 | in6_multihead_lock_done(); |
868 | if (in6m != NULL) { |
869 | IN6M_REMREF(in6m); |
870 | ours = 1; |
871 | } else if (!nd6_prproxy) { |
872 | ip6stat.ip6s_notmember++; |
873 | ip6stat.ip6s_cantforward++; |
874 | in6_ifstat_inc(inifp, ifs6_in_discard); |
875 | goto bad; |
876 | } |
877 | deliverifp = inifp; |
878 | VERIFY(ia6 == NULL); |
879 | goto hbhcheck; |
880 | } |
881 | |
882 | /* |
883 | * Unicast check |
884 | * |
885 | * Fast path: see if the target is ourselves. |
886 | */ |
887 | lck_rw_lock_shared(&in6_ifaddr_rwlock); |
888 | for (ia6 = in6_ifaddrs; ia6 != NULL; ia6 = ia6->ia_next) { |
889 | /* |
890 | * No reference is held on the address, as we just need |
891 | * to test for a few things while holding the RW lock. |
892 | */ |
893 | if (IN6_ARE_ADDR_EQUAL(&ia6->ia_addr.sin6_addr, &ip6->ip6_dst)) |
894 | break; |
895 | } |
896 | |
897 | if (ia6 != NULL) { |
898 | /* |
899 | * For performance, test without acquiring the address lock; |
900 | * a lot of things in the address are set once and never |
901 | * changed (e.g. ia_ifp.) |
902 | */ |
903 | if (!(ia6->ia6_flags & (IN6_IFF_NOTREADY | IN6_IFF_CLAT46))) { |
904 | /* this address is ready */ |
905 | ours = 1; |
906 | deliverifp = ia6->ia_ifp; |
907 | /* |
908 | * record dst address information into mbuf. |
909 | */ |
910 | (void) ip6_setdstifaddr_info(m, 0, ia6); |
911 | lck_rw_done(&in6_ifaddr_rwlock); |
912 | goto hbhcheck; |
913 | } |
914 | lck_rw_done(&in6_ifaddr_rwlock); |
915 | ia6 = NULL; |
916 | /* address is not ready, so discard the packet. */ |
917 | nd6log((LOG_INFO, "%s: packet to an unready address %s->%s\n" , |
918 | __func__, ip6_sprintf(&ip6->ip6_src), |
919 | ip6_sprintf(&ip6->ip6_dst))); |
920 | goto bad; |
921 | } |
922 | lck_rw_done(&in6_ifaddr_rwlock); |
923 | |
924 | /* |
925 | * Slow path: route lookup. |
926 | */ |
927 | dst6 = SIN6(&rin6.ro_dst); |
928 | dst6->sin6_len = sizeof (struct sockaddr_in6); |
929 | dst6->sin6_family = AF_INET6; |
930 | dst6->sin6_addr = ip6->ip6_dst; |
931 | |
932 | rtalloc_scoped_ign((struct route *)&rin6, |
933 | RTF_PRCLONING, IFSCOPE_NONE); |
934 | if (rin6.ro_rt != NULL) |
935 | RT_LOCK_SPIN(rin6.ro_rt); |
936 | |
937 | #define rt6_key(r) (SIN6((r)->rt_nodes->rn_key)) |
938 | |
939 | /* |
940 | * Accept the packet if the forwarding interface to the destination |
941 | * according to the routing table is the loopback interface, |
942 | * unless the associated route has a gateway. |
943 | * Note that this approach causes to accept a packet if there is a |
944 | * route to the loopback interface for the destination of the packet. |
945 | * But we think it's even useful in some situations, e.g. when using |
946 | * a special daemon which wants to intercept the packet. |
947 | * |
948 | * XXX: some OSes automatically make a cloned route for the destination |
949 | * of an outgoing packet. If the outgoing interface of the packet |
950 | * is a loopback one, the kernel would consider the packet to be |
951 | * accepted, even if we have no such address assinged on the interface. |
952 | * We check the cloned flag of the route entry to reject such cases, |
953 | * assuming that route entries for our own addresses are not made by |
954 | * cloning (it should be true because in6_addloop explicitly installs |
955 | * the host route). However, we might have to do an explicit check |
956 | * while it would be less efficient. Or, should we rather install a |
957 | * reject route for such a case? |
958 | */ |
959 | if (rin6.ro_rt != NULL && |
960 | (rin6.ro_rt->rt_flags & (RTF_HOST|RTF_GATEWAY)) == RTF_HOST && |
961 | #if RTF_WASCLONED |
962 | !(rin6.ro_rt->rt_flags & RTF_WASCLONED) && |
963 | #endif |
964 | rin6.ro_rt->rt_ifp->if_type == IFT_LOOP) { |
965 | ia6 = (struct in6_ifaddr *)rin6.ro_rt->rt_ifa; |
966 | /* |
967 | * Packets to a tentative, duplicated, or somehow invalid |
968 | * address must not be accepted. |
969 | * |
970 | * For performance, test without acquiring the address lock; |
971 | * a lot of things in the address are set once and never |
972 | * changed (e.g. ia_ifp.) |
973 | */ |
974 | if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) { |
975 | /* this address is ready */ |
976 | ours = 1; |
977 | deliverifp = ia6->ia_ifp; /* correct? */ |
978 | /* |
979 | * record dst address information into mbuf. |
980 | */ |
981 | (void) ip6_setdstifaddr_info(m, 0, ia6); |
982 | RT_UNLOCK(rin6.ro_rt); |
983 | goto hbhcheck; |
984 | } |
985 | RT_UNLOCK(rin6.ro_rt); |
986 | ia6 = NULL; |
987 | /* address is not ready, so discard the packet. */ |
988 | nd6log((LOG_INFO, "%s: packet to an unready address %s->%s\n" , |
989 | __func__, ip6_sprintf(&ip6->ip6_src), |
990 | ip6_sprintf(&ip6->ip6_dst))); |
991 | goto bad; |
992 | } |
993 | |
994 | if (rin6.ro_rt != NULL) |
995 | RT_UNLOCK(rin6.ro_rt); |
996 | |
997 | /* |
998 | * Now there is no reason to process the packet if it's not our own |
999 | * and we're not a router. |
1000 | */ |
1001 | if (!ip6_forwarding) { |
1002 | ip6stat.ip6s_cantforward++; |
1003 | in6_ifstat_inc(inifp, ifs6_in_discard); |
1004 | /* |
1005 | * Raise a kernel event if the packet received on cellular |
1006 | * interface is not intended for local host. |
1007 | * For now limit it to ICMPv6 packets. |
1008 | */ |
1009 | if (inifp->if_type == IFT_CELLULAR && |
1010 | ip6->ip6_nxt == IPPROTO_ICMPV6) |
1011 | in6_ifstat_inc(inifp, ifs6_cantfoward_icmp6); |
1012 | goto bad; |
1013 | } |
1014 | |
1015 | hbhcheck: |
1016 | /* |
1017 | * record dst address information into mbuf, if we don't have one yet. |
1018 | * note that we are unable to record it, if the address is not listed |
1019 | * as our interface address (e.g. multicast addresses, etc.) |
1020 | */ |
1021 | if (deliverifp != NULL && ia6 == NULL) { |
1022 | ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); |
1023 | if (ia6 != NULL) { |
1024 | (void) ip6_setdstifaddr_info(m, 0, ia6); |
1025 | IFA_REMREF(&ia6->ia_ifa); |
1026 | } |
1027 | } |
1028 | |
1029 | /* |
1030 | * Process Hop-by-Hop options header if it's contained. |
1031 | * m may be modified in ip6_hopopts_input(). |
1032 | * If a JumboPayload option is included, plen will also be modified. |
1033 | */ |
1034 | plen = (u_int32_t)ntohs(ip6->ip6_plen); |
1035 | if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { |
1036 | struct ip6_hbh *hbh; |
1037 | |
1038 | /* |
1039 | * Mark the packet to imply that HBH option has been checked. |
1040 | * This can only be true is the packet came in unfragmented |
1041 | * or if the option is in the first fragment |
1042 | */ |
1043 | m->m_pkthdr.pkt_flags |= PKTF_HBH_CHKED; |
1044 | if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) { |
1045 | #if 0 /* touches NULL pointer */ |
1046 | in6_ifstat_inc(inifp, ifs6_in_discard); |
1047 | #endif |
1048 | goto done; /* m have already been freed */ |
1049 | } |
1050 | |
1051 | /* adjust pointer */ |
1052 | ip6 = mtod(m, struct ip6_hdr *); |
1053 | |
1054 | /* |
1055 | * if the payload length field is 0 and the next header field |
1056 | * indicates Hop-by-Hop Options header, then a Jumbo Payload |
1057 | * option MUST be included. |
1058 | */ |
1059 | if (ip6->ip6_plen == 0 && plen == 0) { |
1060 | /* |
1061 | * Note that if a valid jumbo payload option is |
1062 | * contained, ip6_hopopts_input() must set a valid |
1063 | * (non-zero) payload length to the variable plen. |
1064 | */ |
1065 | ip6stat.ip6s_badoptions++; |
1066 | in6_ifstat_inc(inifp, ifs6_in_discard); |
1067 | in6_ifstat_inc(inifp, ifs6_in_hdrerr); |
1068 | icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER, |
1069 | (caddr_t)&ip6->ip6_plen - (caddr_t)ip6); |
1070 | goto done; |
1071 | } |
1072 | /* ip6_hopopts_input() ensures that mbuf is contiguous */ |
1073 | hbh = (struct ip6_hbh *)(ip6 + 1); |
1074 | nxt = hbh->ip6h_nxt; |
1075 | |
1076 | /* |
1077 | * If we are acting as a router and the packet contains a |
1078 | * router alert option, see if we know the option value. |
1079 | * Currently, we only support the option value for MLD, in which |
1080 | * case we should pass the packet to the multicast routing |
1081 | * daemon. |
1082 | */ |
1083 | if (rtalert != ~0 && ip6_forwarding) { |
1084 | switch (rtalert) { |
1085 | case IP6OPT_RTALERT_MLD: |
1086 | ours = 1; |
1087 | break; |
1088 | default: |
1089 | /* |
1090 | * RFC2711 requires unrecognized values must be |
1091 | * silently ignored. |
1092 | */ |
1093 | break; |
1094 | } |
1095 | } |
1096 | } else |
1097 | nxt = ip6->ip6_nxt; |
1098 | |
1099 | /* |
1100 | * Check that the amount of data in the buffers |
1101 | * is as at least much as the IPv6 header would have us expect. |
1102 | * Trim mbufs if longer than we expect. |
1103 | * Drop packet if shorter than we expect. |
1104 | */ |
1105 | if (m->m_pkthdr.len - sizeof (struct ip6_hdr) < plen) { |
1106 | ip6stat.ip6s_tooshort++; |
1107 | in6_ifstat_inc(inifp, ifs6_in_truncated); |
1108 | goto bad; |
1109 | } |
1110 | if (m->m_pkthdr.len > sizeof (struct ip6_hdr) + plen) { |
1111 | ip6_input_adjust(m, ip6, plen, inifp); |
1112 | } |
1113 | |
1114 | /* |
1115 | * Forward if desirable. |
1116 | */ |
1117 | if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { |
1118 | if (!ours && nd6_prproxy) { |
1119 | /* |
1120 | * If this isn't for us, this might be a Neighbor |
1121 | * Solicitation (dst is solicited-node multicast) |
1122 | * against an address in one of the proxied prefixes; |
1123 | * if so, claim the packet and let icmp6_input() |
1124 | * handle the rest. |
1125 | */ |
1126 | ours = nd6_prproxy_isours(m, ip6, NULL, IFSCOPE_NONE); |
1127 | VERIFY(!ours || |
1128 | (m->m_pkthdr.pkt_flags & PKTF_PROXY_DST)); |
1129 | } |
1130 | if (!ours) |
1131 | goto bad; |
1132 | } else if (!ours) { |
1133 | /* |
1134 | * The unicast forwarding function might return the packet |
1135 | * if we are proxying prefix(es), and if the packet is an |
1136 | * ICMPv6 packet that has failed the zone checks, but is |
1137 | * targetted towards a proxied address (this is optimized by |
1138 | * way of RTF_PROXY test.) If so, claim the packet as ours |
1139 | * and let icmp6_input() handle the rest. The packet's hop |
1140 | * limit value is kept intact (it's not decremented). This |
1141 | * is for supporting Neighbor Unreachability Detection between |
1142 | * proxied nodes on different links (src is link-local, dst |
1143 | * is target address.) |
1144 | */ |
1145 | if ((m = ip6_forward(m, &rin6, 0)) == NULL) |
1146 | goto done; |
1147 | VERIFY(rin6.ro_rt != NULL); |
1148 | VERIFY(m->m_pkthdr.pkt_flags & PKTF_PROXY_DST); |
1149 | deliverifp = rin6.ro_rt->rt_ifp; |
1150 | ours = 1; |
1151 | } |
1152 | |
1153 | ip6 = mtod(m, struct ip6_hdr *); |
1154 | |
1155 | /* |
1156 | * Malicious party may be able to use IPv4 mapped addr to confuse |
1157 | * tcp/udp stack and bypass security checks (act as if it was from |
1158 | * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious. |
1159 | * |
1160 | * For SIIT end node behavior, you may want to disable the check. |
1161 | * However, you will become vulnerable to attacks using IPv4 mapped |
1162 | * source. |
1163 | */ |
1164 | if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || |
1165 | IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { |
1166 | ip6stat.ip6s_badscope++; |
1167 | in6_ifstat_inc(inifp, ifs6_in_addrerr); |
1168 | goto bad; |
1169 | } |
1170 | |
1171 | /* |
1172 | * Tell launch routine the next header |
1173 | */ |
1174 | ip6stat.ip6s_delivered++; |
1175 | in6_ifstat_inc_na(deliverifp, ifs6_in_deliver); |
1176 | |
1177 | injectit: |
1178 | nest = 0; |
1179 | |
1180 | /* |
1181 | * Perform IP header alignment fixup again, if needed. Note that |
1182 | * we do it once for the outermost protocol, and we assume each |
1183 | * protocol handler wouldn't mess with the alignment afterwards. |
1184 | */ |
1185 | IP6_HDR_ALIGNMENT_FIXUP(m, inifp, return); |
1186 | |
1187 | while (nxt != IPPROTO_DONE) { |
1188 | struct ipfilter *filter; |
1189 | int (*pr_input)(struct mbuf **, int *, int); |
1190 | |
1191 | /* |
1192 | * This would imply either IPPROTO_HOPOPTS was not the first |
1193 | * option or it did not come in the first fragment. |
1194 | */ |
1195 | if (nxt == IPPROTO_HOPOPTS && |
1196 | (m->m_pkthdr.pkt_flags & PKTF_HBH_CHKED) == 0) { |
1197 | /* |
1198 | * This implies that HBH option was not contained |
1199 | * in the first fragment |
1200 | */ |
1201 | ip6stat.ip6s_badoptions++; |
1202 | goto bad; |
1203 | } |
1204 | |
1205 | if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) { |
1206 | ip6stat.ip6s_toomanyhdr++; |
1207 | goto bad; |
1208 | } |
1209 | |
1210 | /* |
1211 | * protection against faulty packet - there should be |
1212 | * more sanity checks in header chain processing. |
1213 | */ |
1214 | if (m->m_pkthdr.len < off) { |
1215 | ip6stat.ip6s_tooshort++; |
1216 | in6_ifstat_inc(inifp, ifs6_in_truncated); |
1217 | goto bad; |
1218 | } |
1219 | |
1220 | #if IPSEC |
1221 | /* |
1222 | * enforce IPsec policy checking if we are seeing last header. |
1223 | * note that we do not visit this with protocols with pcb layer |
1224 | * code - like udp/tcp/raw ip. |
1225 | */ |
1226 | if ((ipsec_bypass == 0) && |
1227 | (ip6_protox[nxt]->pr_flags & PR_LASTHDR) != 0) { |
1228 | if (ipsec6_in_reject(m, NULL)) { |
1229 | IPSEC_STAT_INCREMENT(ipsec6stat.in_polvio); |
1230 | goto bad; |
1231 | } |
1232 | } |
1233 | #endif /* IPSEC */ |
1234 | |
1235 | /* |
1236 | * Call IP filter |
1237 | */ |
1238 | if (!TAILQ_EMPTY(&ipv6_filters) && !IFNET_IS_INTCOPROC(inifp)) { |
1239 | ipf_ref(); |
1240 | TAILQ_FOREACH(filter, &ipv6_filters, ipf_link) { |
1241 | if (seen == 0) { |
1242 | if ((struct ipfilter *)inject_ipfref == |
1243 | filter) |
1244 | seen = 1; |
1245 | } else if (filter->ipf_filter.ipf_input) { |
1246 | errno_t result; |
1247 | |
1248 | result = filter->ipf_filter.ipf_input( |
1249 | filter->ipf_filter.cookie, |
1250 | (mbuf_t *)&m, off, nxt); |
1251 | if (result == EJUSTRETURN) { |
1252 | ipf_unref(); |
1253 | goto done; |
1254 | } |
1255 | if (result != 0) { |
1256 | ipf_unref(); |
1257 | goto bad; |
1258 | } |
1259 | } |
1260 | } |
1261 | ipf_unref(); |
1262 | } |
1263 | |
1264 | DTRACE_IP6(receive, struct mbuf *, m, struct inpcb *, NULL, |
1265 | struct ip6_hdr *, ip6, struct ifnet *, inifp, |
1266 | struct ip *, NULL, struct ip6_hdr *, ip6); |
1267 | |
1268 | if ((pr_input = ip6_protox[nxt]->pr_input) == NULL) { |
1269 | m_freem(m); |
1270 | m = NULL; |
1271 | nxt = IPPROTO_DONE; |
1272 | } else if (!(ip6_protox[nxt]->pr_flags & PR_PROTOLOCK)) { |
1273 | lck_mtx_lock(inet6_domain_mutex); |
1274 | nxt = pr_input(&m, &off, nxt); |
1275 | lck_mtx_unlock(inet6_domain_mutex); |
1276 | } else { |
1277 | nxt = pr_input(&m, &off, nxt); |
1278 | } |
1279 | } |
1280 | done: |
1281 | ROUTE_RELEASE(&rin6); |
1282 | return; |
1283 | bad: |
1284 | m_freem(m); |
1285 | goto done; |
1286 | } |
1287 | |
1288 | void |
1289 | ip6_setsrcifaddr_info(struct mbuf *m, uint32_t src_idx, struct in6_ifaddr *ia6) |
1290 | { |
1291 | VERIFY(m->m_flags & M_PKTHDR); |
1292 | |
1293 | /* |
1294 | * If the source ifaddr is specified, pick up the information |
1295 | * from there; otherwise just grab the passed-in ifindex as the |
1296 | * caller may not have the ifaddr available. |
1297 | */ |
1298 | if (ia6 != NULL) { |
1299 | m->m_pkthdr.pkt_flags |= PKTF_IFAINFO; |
1300 | m->m_pkthdr.src_ifindex = ia6->ia_ifp->if_index; |
1301 | |
1302 | /* See IN6_IFF comments in in6_var.h */ |
1303 | m->m_pkthdr.src_iff = (ia6->ia6_flags & 0xffff); |
1304 | } else { |
1305 | m->m_pkthdr.src_iff = 0; |
1306 | m->m_pkthdr.src_ifindex = src_idx; |
1307 | if (src_idx != 0) |
1308 | m->m_pkthdr.pkt_flags |= PKTF_IFAINFO; |
1309 | } |
1310 | } |
1311 | |
1312 | void |
1313 | ip6_setdstifaddr_info(struct mbuf *m, uint32_t dst_idx, struct in6_ifaddr *ia6) |
1314 | { |
1315 | VERIFY(m->m_flags & M_PKTHDR); |
1316 | |
1317 | /* |
1318 | * If the destination ifaddr is specified, pick up the information |
1319 | * from there; otherwise just grab the passed-in ifindex as the |
1320 | * caller may not have the ifaddr available. |
1321 | */ |
1322 | if (ia6 != NULL) { |
1323 | m->m_pkthdr.pkt_flags |= PKTF_IFAINFO; |
1324 | m->m_pkthdr.dst_ifindex = ia6->ia_ifp->if_index; |
1325 | |
1326 | /* See IN6_IFF comments in in6_var.h */ |
1327 | m->m_pkthdr.dst_iff = (ia6->ia6_flags & 0xffff); |
1328 | } else { |
1329 | m->m_pkthdr.dst_iff = 0; |
1330 | m->m_pkthdr.dst_ifindex = dst_idx; |
1331 | if (dst_idx != 0) |
1332 | m->m_pkthdr.pkt_flags |= PKTF_IFAINFO; |
1333 | } |
1334 | } |
1335 | |
1336 | int |
1337 | ip6_getsrcifaddr_info(struct mbuf *m, uint32_t *src_idx, uint32_t *ia6f) |
1338 | { |
1339 | VERIFY(m->m_flags & M_PKTHDR); |
1340 | |
1341 | if (!(m->m_pkthdr.pkt_flags & PKTF_IFAINFO)) |
1342 | return (-1); |
1343 | |
1344 | if (src_idx != NULL) |
1345 | *src_idx = m->m_pkthdr.src_ifindex; |
1346 | |
1347 | if (ia6f != NULL) |
1348 | *ia6f = m->m_pkthdr.src_iff; |
1349 | |
1350 | return (0); |
1351 | } |
1352 | |
1353 | int |
1354 | ip6_getdstifaddr_info(struct mbuf *m, uint32_t *dst_idx, uint32_t *ia6f) |
1355 | { |
1356 | VERIFY(m->m_flags & M_PKTHDR); |
1357 | |
1358 | if (!(m->m_pkthdr.pkt_flags & PKTF_IFAINFO)) |
1359 | return (-1); |
1360 | |
1361 | if (dst_idx != NULL) |
1362 | *dst_idx = m->m_pkthdr.dst_ifindex; |
1363 | |
1364 | if (ia6f != NULL) |
1365 | *ia6f = m->m_pkthdr.dst_iff; |
1366 | |
1367 | return (0); |
1368 | } |
1369 | |
1370 | /* |
1371 | * Hop-by-Hop options header processing. If a valid jumbo payload option is |
1372 | * included, the real payload length will be stored in plenp. |
1373 | */ |
1374 | static int |
1375 | ip6_hopopts_input(uint32_t *plenp, uint32_t *rtalertp, struct mbuf **mp, |
1376 | int *offp) |
1377 | { |
1378 | struct mbuf *m = *mp; |
1379 | int off = *offp, hbhlen; |
1380 | struct ip6_hbh *hbh; |
1381 | u_int8_t *opt; |
1382 | |
1383 | /* validation of the length of the header */ |
1384 | IP6_EXTHDR_CHECK(m, off, sizeof (*hbh), return (-1)); |
1385 | hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off); |
1386 | hbhlen = (hbh->ip6h_len + 1) << 3; |
1387 | |
1388 | IP6_EXTHDR_CHECK(m, off, hbhlen, return (-1)); |
1389 | hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off); |
1390 | off += hbhlen; |
1391 | hbhlen -= sizeof (struct ip6_hbh); |
1392 | opt = (u_int8_t *)hbh + sizeof (struct ip6_hbh); |
1393 | |
1394 | if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof (struct ip6_hbh), |
1395 | hbhlen, rtalertp, plenp) < 0) |
1396 | return (-1); |
1397 | |
1398 | *offp = off; |
1399 | *mp = m; |
1400 | return (0); |
1401 | } |
1402 | |
1403 | /* |
1404 | * Search header for all Hop-by-hop options and process each option. |
1405 | * This function is separate from ip6_hopopts_input() in order to |
1406 | * handle a case where the sending node itself process its hop-by-hop |
1407 | * options header. In such a case, the function is called from ip6_output(). |
1408 | * |
1409 | * The function assumes that hbh header is located right after the IPv6 header |
1410 | * (RFC2460 p7), opthead is pointer into data content in m, and opthead to |
1411 | * opthead + hbhlen is located in continuous memory region. |
1412 | */ |
1413 | int |
1414 | ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen, |
1415 | u_int32_t *rtalertp, u_int32_t *plenp) |
1416 | { |
1417 | struct ip6_hdr *ip6; |
1418 | int optlen = 0; |
1419 | u_int8_t *opt = opthead; |
1420 | u_int16_t rtalert_val; |
1421 | u_int32_t jumboplen; |
1422 | const int erroff = sizeof (struct ip6_hdr) + sizeof (struct ip6_hbh); |
1423 | |
1424 | for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) { |
1425 | switch (*opt) { |
1426 | case IP6OPT_PAD1: |
1427 | optlen = 1; |
1428 | break; |
1429 | case IP6OPT_PADN: |
1430 | if (hbhlen < IP6OPT_MINLEN) { |
1431 | ip6stat.ip6s_toosmall++; |
1432 | goto bad; |
1433 | } |
1434 | optlen = *(opt + 1) + 2; |
1435 | break; |
1436 | case IP6OPT_ROUTER_ALERT: |
1437 | /* XXX may need check for alignment */ |
1438 | if (hbhlen < IP6OPT_RTALERT_LEN) { |
1439 | ip6stat.ip6s_toosmall++; |
1440 | goto bad; |
1441 | } |
1442 | if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) { |
1443 | /* XXX stat */ |
1444 | icmp6_error(m, ICMP6_PARAM_PROB, |
1445 | ICMP6_PARAMPROB_HEADER, |
1446 | erroff + opt + 1 - opthead); |
1447 | return (-1); |
1448 | } |
1449 | optlen = IP6OPT_RTALERT_LEN; |
1450 | bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2); |
1451 | *rtalertp = ntohs(rtalert_val); |
1452 | break; |
1453 | case IP6OPT_JUMBO: |
1454 | /* XXX may need check for alignment */ |
1455 | if (hbhlen < IP6OPT_JUMBO_LEN) { |
1456 | ip6stat.ip6s_toosmall++; |
1457 | goto bad; |
1458 | } |
1459 | if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) { |
1460 | /* XXX stat */ |
1461 | icmp6_error(m, ICMP6_PARAM_PROB, |
1462 | ICMP6_PARAMPROB_HEADER, |
1463 | erroff + opt + 1 - opthead); |
1464 | return (-1); |
1465 | } |
1466 | optlen = IP6OPT_JUMBO_LEN; |
1467 | |
1468 | /* |
1469 | * IPv6 packets that have non 0 payload length |
1470 | * must not contain a jumbo payload option. |
1471 | */ |
1472 | ip6 = mtod(m, struct ip6_hdr *); |
1473 | if (ip6->ip6_plen) { |
1474 | ip6stat.ip6s_badoptions++; |
1475 | icmp6_error(m, ICMP6_PARAM_PROB, |
1476 | ICMP6_PARAMPROB_HEADER, |
1477 | erroff + opt - opthead); |
1478 | return (-1); |
1479 | } |
1480 | |
1481 | /* |
1482 | * We may see jumbolen in unaligned location, so |
1483 | * we'd need to perform bcopy(). |
1484 | */ |
1485 | bcopy(opt + 2, &jumboplen, sizeof (jumboplen)); |
1486 | jumboplen = (u_int32_t)htonl(jumboplen); |
1487 | |
1488 | #if 1 |
1489 | /* |
1490 | * if there are multiple jumbo payload options, |
1491 | * *plenp will be non-zero and the packet will be |
1492 | * rejected. |
1493 | * the behavior may need some debate in ipngwg - |
1494 | * multiple options does not make sense, however, |
1495 | * there's no explicit mention in specification. |
1496 | */ |
1497 | if (*plenp != 0) { |
1498 | ip6stat.ip6s_badoptions++; |
1499 | icmp6_error(m, ICMP6_PARAM_PROB, |
1500 | ICMP6_PARAMPROB_HEADER, |
1501 | erroff + opt + 2 - opthead); |
1502 | return (-1); |
1503 | } |
1504 | #endif |
1505 | |
1506 | /* |
1507 | * jumbo payload length must be larger than 65535. |
1508 | */ |
1509 | if (jumboplen <= IPV6_MAXPACKET) { |
1510 | ip6stat.ip6s_badoptions++; |
1511 | icmp6_error(m, ICMP6_PARAM_PROB, |
1512 | ICMP6_PARAMPROB_HEADER, |
1513 | erroff + opt + 2 - opthead); |
1514 | return (-1); |
1515 | } |
1516 | *plenp = jumboplen; |
1517 | |
1518 | break; |
1519 | default: /* unknown option */ |
1520 | if (hbhlen < IP6OPT_MINLEN) { |
1521 | ip6stat.ip6s_toosmall++; |
1522 | goto bad; |
1523 | } |
1524 | optlen = ip6_unknown_opt(opt, m, |
1525 | erroff + opt - opthead); |
1526 | if (optlen == -1) { |
1527 | return (-1); |
1528 | } |
1529 | optlen += 2; |
1530 | break; |
1531 | } |
1532 | } |
1533 | |
1534 | return (0); |
1535 | |
1536 | bad: |
1537 | m_freem(m); |
1538 | return (-1); |
1539 | } |
1540 | |
1541 | /* |
1542 | * Unknown option processing. |
1543 | * The third argument `off' is the offset from the IPv6 header to the option, |
1544 | * which is necessary if the IPv6 header the and option header and IPv6 header |
1545 | * is not continuous in order to return an ICMPv6 error. |
1546 | */ |
1547 | int |
1548 | ip6_unknown_opt(uint8_t *optp, struct mbuf *m, int off) |
1549 | { |
1550 | struct ip6_hdr *ip6; |
1551 | |
1552 | switch (IP6OPT_TYPE(*optp)) { |
1553 | case IP6OPT_TYPE_SKIP: /* ignore the option */ |
1554 | return ((int)*(optp + 1)); |
1555 | |
1556 | case IP6OPT_TYPE_DISCARD: /* silently discard */ |
1557 | m_freem(m); |
1558 | return (-1); |
1559 | |
1560 | case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */ |
1561 | ip6stat.ip6s_badoptions++; |
1562 | icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off); |
1563 | return (-1); |
1564 | |
1565 | case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */ |
1566 | ip6stat.ip6s_badoptions++; |
1567 | ip6 = mtod(m, struct ip6_hdr *); |
1568 | if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) || |
1569 | (m->m_flags & (M_BCAST|M_MCAST))) { |
1570 | m_freem(m); |
1571 | } else { |
1572 | icmp6_error(m, ICMP6_PARAM_PROB, |
1573 | ICMP6_PARAMPROB_OPTION, off); |
1574 | } |
1575 | return (-1); |
1576 | } |
1577 | |
1578 | m_freem(m); /* XXX: NOTREACHED */ |
1579 | return (-1); |
1580 | } |
1581 | |
1582 | /* |
1583 | * Create the "control" list for this pcb. |
1584 | * These functions will not modify mbuf chain at all. |
1585 | * |
1586 | * With KAME mbuf chain restriction: |
1587 | * The routine will be called from upper layer handlers like tcp6_input(). |
1588 | * Thus the routine assumes that the caller (tcp6_input) have already |
1589 | * called IP6_EXTHDR_CHECK() and all the extension headers are located in the |
1590 | * very first mbuf on the mbuf chain. |
1591 | * |
1592 | * ip6_savecontrol_v4 will handle those options that are possible to be |
1593 | * set on a v4-mapped socket. |
1594 | * ip6_savecontrol will directly call ip6_savecontrol_v4 to handle those |
1595 | * options and handle the v6-only ones itself. |
1596 | */ |
1597 | struct mbuf ** |
1598 | ip6_savecontrol_v4(struct inpcb *inp, struct mbuf *m, struct mbuf **mp, |
1599 | int *v4only) |
1600 | { |
1601 | struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); |
1602 | |
1603 | if ((inp->inp_socket->so_options & SO_TIMESTAMP) != 0) { |
1604 | struct timeval tv; |
1605 | |
1606 | getmicrotime(&tv); |
1607 | mp = sbcreatecontrol_mbuf((caddr_t)&tv, sizeof (tv), |
1608 | SCM_TIMESTAMP, SOL_SOCKET, mp); |
1609 | if (*mp == NULL) |
1610 | return (NULL); |
1611 | } |
1612 | if ((inp->inp_socket->so_options & SO_TIMESTAMP_MONOTONIC) != 0) { |
1613 | uint64_t time; |
1614 | |
1615 | time = mach_absolute_time(); |
1616 | mp = sbcreatecontrol_mbuf((caddr_t)&time, sizeof (time), |
1617 | SCM_TIMESTAMP_MONOTONIC, SOL_SOCKET, mp); |
1618 | if (*mp == NULL) |
1619 | return (NULL); |
1620 | } |
1621 | if ((inp->inp_socket->so_options & SO_TIMESTAMP_CONTINUOUS) != 0) { |
1622 | uint64_t time; |
1623 | |
1624 | time = mach_continuous_time(); |
1625 | mp = sbcreatecontrol_mbuf((caddr_t)&time, sizeof (time), |
1626 | SCM_TIMESTAMP_CONTINUOUS, SOL_SOCKET, mp); |
1627 | if (*mp == NULL) |
1628 | return (NULL); |
1629 | } |
1630 | if ((inp->inp_socket->so_flags & SOF_RECV_TRAFFIC_CLASS) != 0) { |
1631 | int tc = m_get_traffic_class(m); |
1632 | |
1633 | mp = sbcreatecontrol_mbuf((caddr_t)&tc, sizeof (tc), |
1634 | SO_TRAFFIC_CLASS, SOL_SOCKET, mp); |
1635 | if (*mp == NULL) |
1636 | return (NULL); |
1637 | } |
1638 | |
1639 | #define IS2292(inp, x, y) (((inp)->inp_flags & IN6P_RFC2292) ? (x) : (y)) |
1640 | if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { |
1641 | if (v4only != NULL) { |
1642 | *v4only = 1; |
1643 | } |
1644 | |
1645 | // Send ECN flags for v4-mapped addresses |
1646 | if ((inp->inp_flags & IN6P_TCLASS) != 0) { |
1647 | struct ip * = mtod(m, struct ip *); |
1648 | u_int8_t tos = (ip_header->ip_tos & IPTOS_ECN_MASK); |
1649 | |
1650 | mp = sbcreatecontrol_mbuf((caddr_t)&tos, sizeof(tos), |
1651 | IPV6_TCLASS, IPPROTO_IPV6, mp); |
1652 | if (*mp == NULL) |
1653 | return (NULL); |
1654 | } |
1655 | |
1656 | // Send IN6P_PKTINFO for v4-mapped address |
1657 | if ((inp->inp_flags & IN6P_PKTINFO) != 0) { |
1658 | struct in6_pktinfo pi6 = { |
1659 | .ipi6_addr = IN6ADDR_V4MAPPED_INIT, |
1660 | .ipi6_ifindex = (m && m->m_pkthdr.rcvif) ? m->m_pkthdr.rcvif->if_index : 0, |
1661 | }; |
1662 | |
1663 | struct ip * = mtod(m, struct ip *); |
1664 | bcopy(&ip_header->ip_dst, &pi6.ipi6_addr.s6_addr32[3], sizeof(struct in_addr)); |
1665 | |
1666 | mp = sbcreatecontrol_mbuf((caddr_t)&pi6, |
1667 | sizeof (struct in6_pktinfo), |
1668 | IS2292(inp, IPV6_2292PKTINFO, IPV6_PKTINFO), |
1669 | IPPROTO_IPV6, mp); |
1670 | if (*mp == NULL) |
1671 | return (NULL); |
1672 | } |
1673 | return (mp); |
1674 | } |
1675 | |
1676 | /* RFC 2292 sec. 5 */ |
1677 | if ((inp->inp_flags & IN6P_PKTINFO) != 0) { |
1678 | struct in6_pktinfo pi6; |
1679 | |
1680 | bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof (struct in6_addr)); |
1681 | in6_clearscope(&pi6.ipi6_addr); /* XXX */ |
1682 | pi6.ipi6_ifindex = |
1683 | (m && m->m_pkthdr.rcvif) ? m->m_pkthdr.rcvif->if_index : 0; |
1684 | |
1685 | mp = sbcreatecontrol_mbuf((caddr_t)&pi6, |
1686 | sizeof (struct in6_pktinfo), |
1687 | IS2292(inp, IPV6_2292PKTINFO, IPV6_PKTINFO), |
1688 | IPPROTO_IPV6, mp); |
1689 | if (*mp == NULL) |
1690 | return (NULL); |
1691 | } |
1692 | |
1693 | if ((inp->inp_flags & IN6P_HOPLIMIT) != 0) { |
1694 | int hlim = ip6->ip6_hlim & 0xff; |
1695 | |
1696 | mp = sbcreatecontrol_mbuf((caddr_t)&hlim, sizeof (int), |
1697 | IS2292(inp, IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), |
1698 | IPPROTO_IPV6, mp); |
1699 | if (*mp == NULL) |
1700 | return (NULL); |
1701 | } |
1702 | |
1703 | if (v4only != NULL) |
1704 | *v4only = 0; |
1705 | return (mp); |
1706 | } |
1707 | |
1708 | int |
1709 | ip6_savecontrol(struct inpcb *in6p, struct mbuf *m, struct mbuf **mp) |
1710 | { |
1711 | struct mbuf **np; |
1712 | struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); |
1713 | int v4only = 0; |
1714 | |
1715 | *mp = NULL; |
1716 | np = ip6_savecontrol_v4(in6p, m, mp, &v4only); |
1717 | if (np == NULL) |
1718 | goto no_mbufs; |
1719 | |
1720 | mp = np; |
1721 | if (v4only) |
1722 | return (0); |
1723 | |
1724 | if ((in6p->inp_flags & IN6P_TCLASS) != 0) { |
1725 | u_int32_t flowinfo; |
1726 | int tclass; |
1727 | |
1728 | flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK); |
1729 | flowinfo >>= 20; |
1730 | |
1731 | tclass = flowinfo & 0xff; |
1732 | mp = sbcreatecontrol_mbuf((caddr_t)&tclass, sizeof (tclass), |
1733 | IPV6_TCLASS, IPPROTO_IPV6, mp); |
1734 | if (*mp == NULL) |
1735 | goto no_mbufs; |
1736 | } |
1737 | |
1738 | /* |
1739 | * IPV6_HOPOPTS socket option. Recall that we required super-user |
1740 | * privilege for the option (see ip6_ctloutput), but it might be too |
1741 | * strict, since there might be some hop-by-hop options which can be |
1742 | * returned to normal user. |
1743 | * See also RFC 2292 section 6 (or RFC 3542 section 8). |
1744 | */ |
1745 | if ((in6p->inp_flags & IN6P_HOPOPTS) != 0) { |
1746 | /* |
1747 | * Check if a hop-by-hop options header is contatined in the |
1748 | * received packet, and if so, store the options as ancillary |
1749 | * data. Note that a hop-by-hop options header must be |
1750 | * just after the IPv6 header, which is assured through the |
1751 | * IPv6 input processing. |
1752 | */ |
1753 | ip6 = mtod(m, struct ip6_hdr *); |
1754 | if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { |
1755 | struct ip6_hbh *hbh; |
1756 | int hbhlen = 0; |
1757 | hbh = (struct ip6_hbh *)(ip6 + 1); |
1758 | hbhlen = (hbh->ip6h_len + 1) << 3; |
1759 | |
1760 | /* |
1761 | * XXX: We copy the whole header even if a |
1762 | * jumbo payload option is included, the option which |
1763 | * is to be removed before returning according to |
1764 | * RFC2292. |
1765 | * Note: this constraint is removed in RFC3542 |
1766 | */ |
1767 | mp = sbcreatecontrol_mbuf((caddr_t)hbh, hbhlen, |
1768 | IS2292(in6p, IPV6_2292HOPOPTS, IPV6_HOPOPTS), |
1769 | IPPROTO_IPV6, mp); |
1770 | |
1771 | if (*mp == NULL) { |
1772 | goto no_mbufs; |
1773 | } |
1774 | } |
1775 | } |
1776 | |
1777 | if ((in6p->inp_flags & (IN6P_RTHDR | IN6P_DSTOPTS)) != 0) { |
1778 | int nxt = ip6->ip6_nxt, off = sizeof (struct ip6_hdr); |
1779 | |
1780 | /* |
1781 | * Search for destination options headers or routing |
1782 | * header(s) through the header chain, and stores each |
1783 | * header as ancillary data. |
1784 | * Note that the order of the headers remains in |
1785 | * the chain of ancillary data. |
1786 | */ |
1787 | while (1) { /* is explicit loop prevention necessary? */ |
1788 | struct ip6_ext *ip6e = NULL; |
1789 | int elen; |
1790 | |
1791 | /* |
1792 | * if it is not an extension header, don't try to |
1793 | * pull it from the chain. |
1794 | */ |
1795 | switch (nxt) { |
1796 | case IPPROTO_DSTOPTS: |
1797 | case IPPROTO_ROUTING: |
1798 | case IPPROTO_HOPOPTS: |
1799 | case IPPROTO_AH: /* is it possible? */ |
1800 | break; |
1801 | default: |
1802 | goto loopend; |
1803 | } |
1804 | |
1805 | if (off + sizeof (*ip6e) > m->m_len) |
1806 | goto loopend; |
1807 | ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off); |
1808 | if (nxt == IPPROTO_AH) |
1809 | elen = (ip6e->ip6e_len + 2) << 2; |
1810 | else |
1811 | elen = (ip6e->ip6e_len + 1) << 3; |
1812 | if (off + elen > m->m_len) |
1813 | goto loopend; |
1814 | |
1815 | switch (nxt) { |
1816 | case IPPROTO_DSTOPTS: |
1817 | if (!(in6p->inp_flags & IN6P_DSTOPTS)) |
1818 | break; |
1819 | |
1820 | mp = sbcreatecontrol_mbuf((caddr_t)ip6e, elen, |
1821 | IS2292(in6p, IPV6_2292DSTOPTS, |
1822 | IPV6_DSTOPTS), IPPROTO_IPV6, mp); |
1823 | if (*mp == NULL) { |
1824 | goto no_mbufs; |
1825 | } |
1826 | break; |
1827 | case IPPROTO_ROUTING: |
1828 | if (!(in6p->inp_flags & IN6P_RTHDR)) |
1829 | break; |
1830 | |
1831 | mp = sbcreatecontrol_mbuf((caddr_t)ip6e, elen, |
1832 | IS2292(in6p, IPV6_2292RTHDR, IPV6_RTHDR), |
1833 | IPPROTO_IPV6, mp); |
1834 | if (*mp == NULL) { |
1835 | goto no_mbufs; |
1836 | } |
1837 | break; |
1838 | case IPPROTO_HOPOPTS: |
1839 | case IPPROTO_AH: /* is it possible? */ |
1840 | break; |
1841 | |
1842 | default: |
1843 | /* |
1844 | * other cases have been filtered in the above. |
1845 | * none will visit this case. here we supply |
1846 | * the code just in case (nxt overwritten or |
1847 | * other cases). |
1848 | */ |
1849 | goto loopend; |
1850 | |
1851 | } |
1852 | |
1853 | /* proceed with the next header. */ |
1854 | off += elen; |
1855 | nxt = ip6e->ip6e_nxt; |
1856 | ip6e = NULL; |
1857 | } |
1858 | loopend: |
1859 | ; |
1860 | } |
1861 | return (0); |
1862 | no_mbufs: |
1863 | ip6stat.ip6s_pktdropcntrl++; |
1864 | /* XXX increment a stat to show the failure */ |
1865 | return (ENOBUFS); |
1866 | } |
1867 | #undef IS2292 |
1868 | |
1869 | void |
1870 | ip6_notify_pmtu(struct inpcb *in6p, struct sockaddr_in6 *dst, u_int32_t *mtu) |
1871 | { |
1872 | struct socket *so; |
1873 | struct mbuf *m_mtu; |
1874 | struct ip6_mtuinfo mtuctl; |
1875 | |
1876 | so = in6p->inp_socket; |
1877 | |
1878 | if ((in6p->inp_flags & IN6P_MTU) == 0) |
1879 | return; |
1880 | |
1881 | if (mtu == NULL) |
1882 | return; |
1883 | |
1884 | #ifdef DIAGNOSTIC |
1885 | if (so == NULL) { /* I believe this is impossible */ |
1886 | panic("ip6_notify_pmtu: socket is NULL" ); |
1887 | /* NOTREACHED */ |
1888 | } |
1889 | #endif |
1890 | |
1891 | if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) && |
1892 | (so->so_proto == NULL || so->so_proto->pr_protocol == IPPROTO_TCP)) |
1893 | return; |
1894 | |
1895 | if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) && |
1896 | !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &dst->sin6_addr)) |
1897 | return; |
1898 | |
1899 | bzero(&mtuctl, sizeof (mtuctl)); /* zero-clear for safety */ |
1900 | mtuctl.ip6m_mtu = *mtu; |
1901 | mtuctl.ip6m_addr = *dst; |
1902 | if (sa6_recoverscope(&mtuctl.ip6m_addr, TRUE)) |
1903 | return; |
1904 | |
1905 | if ((m_mtu = sbcreatecontrol((caddr_t)&mtuctl, sizeof (mtuctl), |
1906 | IPV6_PATHMTU, IPPROTO_IPV6)) == NULL) |
1907 | return; |
1908 | |
1909 | if (sbappendaddr(&so->so_rcv, SA(dst), NULL, m_mtu, NULL) == 0) { |
1910 | m_freem(m_mtu); |
1911 | /* XXX: should count statistics */ |
1912 | } else { |
1913 | sorwakeup(so); |
1914 | } |
1915 | } |
1916 | |
1917 | /* |
1918 | * Get pointer to the previous header followed by the header |
1919 | * currently processed. |
1920 | * XXX: This function supposes that |
1921 | * M includes all headers, |
1922 | * the next header field and the header length field of each header |
1923 | * are valid, and |
1924 | * the sum of each header length equals to OFF. |
1925 | * Because of these assumptions, this function must be called very |
1926 | * carefully. Moreover, it will not be used in the near future when |
1927 | * we develop `neater' mechanism to process extension headers. |
1928 | */ |
1929 | char * |
1930 | ip6_get_prevhdr(struct mbuf *m, int off) |
1931 | { |
1932 | struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); |
1933 | |
1934 | if (off == sizeof (struct ip6_hdr)) { |
1935 | return ((char *)&ip6->ip6_nxt); |
1936 | } else { |
1937 | int len, nxt; |
1938 | struct ip6_ext *ip6e = NULL; |
1939 | |
1940 | nxt = ip6->ip6_nxt; |
1941 | len = sizeof (struct ip6_hdr); |
1942 | while (len < off) { |
1943 | ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len); |
1944 | |
1945 | switch (nxt) { |
1946 | case IPPROTO_FRAGMENT: |
1947 | len += sizeof (struct ip6_frag); |
1948 | break; |
1949 | case IPPROTO_AH: |
1950 | len += (ip6e->ip6e_len + 2) << 2; |
1951 | break; |
1952 | default: |
1953 | len += (ip6e->ip6e_len + 1) << 3; |
1954 | break; |
1955 | } |
1956 | nxt = ip6e->ip6e_nxt; |
1957 | } |
1958 | if (ip6e) |
1959 | return ((char *)&ip6e->ip6e_nxt); |
1960 | else |
1961 | return (NULL); |
1962 | } |
1963 | } |
1964 | |
1965 | /* |
1966 | * get next header offset. m will be retained. |
1967 | */ |
1968 | int |
1969 | ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp) |
1970 | { |
1971 | struct ip6_hdr ip6; |
1972 | struct ip6_ext ip6e; |
1973 | struct ip6_frag fh; |
1974 | |
1975 | /* just in case */ |
1976 | VERIFY(m != NULL); |
1977 | if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off) |
1978 | return (-1); |
1979 | |
1980 | switch (proto) { |
1981 | case IPPROTO_IPV6: |
1982 | if (m->m_pkthdr.len < off + sizeof (ip6)) |
1983 | return (-1); |
1984 | m_copydata(m, off, sizeof (ip6), (caddr_t)&ip6); |
1985 | if (nxtp) |
1986 | *nxtp = ip6.ip6_nxt; |
1987 | off += sizeof (ip6); |
1988 | return (off); |
1989 | |
1990 | case IPPROTO_FRAGMENT: |
1991 | /* |
1992 | * terminate parsing if it is not the first fragment, |
1993 | * it does not make sense to parse through it. |
1994 | */ |
1995 | if (m->m_pkthdr.len < off + sizeof (fh)) |
1996 | return (-1); |
1997 | m_copydata(m, off, sizeof (fh), (caddr_t)&fh); |
1998 | /* IP6F_OFF_MASK = 0xfff8(BigEndian), 0xf8ff(LittleEndian) */ |
1999 | if (fh.ip6f_offlg & IP6F_OFF_MASK) |
2000 | return (-1); |
2001 | if (nxtp) |
2002 | *nxtp = fh.ip6f_nxt; |
2003 | off += sizeof (struct ip6_frag); |
2004 | return (off); |
2005 | |
2006 | case IPPROTO_AH: |
2007 | if (m->m_pkthdr.len < off + sizeof (ip6e)) |
2008 | return (-1); |
2009 | m_copydata(m, off, sizeof (ip6e), (caddr_t)&ip6e); |
2010 | if (nxtp) |
2011 | *nxtp = ip6e.ip6e_nxt; |
2012 | off += (ip6e.ip6e_len + 2) << 2; |
2013 | return (off); |
2014 | |
2015 | case IPPROTO_HOPOPTS: |
2016 | case IPPROTO_ROUTING: |
2017 | case IPPROTO_DSTOPTS: |
2018 | if (m->m_pkthdr.len < off + sizeof (ip6e)) |
2019 | return (-1); |
2020 | m_copydata(m, off, sizeof (ip6e), (caddr_t)&ip6e); |
2021 | if (nxtp) |
2022 | *nxtp = ip6e.ip6e_nxt; |
2023 | off += (ip6e.ip6e_len + 1) << 3; |
2024 | return (off); |
2025 | |
2026 | case IPPROTO_NONE: |
2027 | case IPPROTO_ESP: |
2028 | case IPPROTO_IPCOMP: |
2029 | /* give up */ |
2030 | return (-1); |
2031 | |
2032 | default: |
2033 | return (-1); |
2034 | } |
2035 | } |
2036 | |
2037 | /* |
2038 | * get offset for the last header in the chain. m will be kept untainted. |
2039 | */ |
2040 | int |
2041 | ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp) |
2042 | { |
2043 | int newoff; |
2044 | int nxt; |
2045 | |
2046 | if (!nxtp) { |
2047 | nxt = -1; |
2048 | nxtp = &nxt; |
2049 | } |
2050 | while (1) { |
2051 | newoff = ip6_nexthdr(m, off, proto, nxtp); |
2052 | if (newoff < 0) |
2053 | return (off); |
2054 | else if (newoff < off) |
2055 | return (-1); /* invalid */ |
2056 | else if (newoff == off) |
2057 | return (newoff); |
2058 | |
2059 | off = newoff; |
2060 | proto = *nxtp; |
2061 | } |
2062 | } |
2063 | |
2064 | struct ip6aux * |
2065 | ip6_addaux(struct mbuf *m) |
2066 | { |
2067 | struct m_tag *tag; |
2068 | |
2069 | /* Check if one is already allocated */ |
2070 | tag = m_tag_locate(m, KERNEL_MODULE_TAG_ID, |
2071 | KERNEL_TAG_TYPE_INET6, NULL); |
2072 | if (tag == NULL) { |
2073 | /* Allocate a tag */ |
2074 | tag = m_tag_create(KERNEL_MODULE_TAG_ID, KERNEL_TAG_TYPE_INET6, |
2075 | sizeof (struct ip6aux), M_DONTWAIT, m); |
2076 | |
2077 | /* Attach it to the mbuf */ |
2078 | if (tag) { |
2079 | m_tag_prepend(m, tag); |
2080 | } |
2081 | } |
2082 | |
2083 | return (tag ? (struct ip6aux *)(tag + 1) : NULL); |
2084 | } |
2085 | |
2086 | struct ip6aux * |
2087 | ip6_findaux(struct mbuf *m) |
2088 | { |
2089 | struct m_tag *tag; |
2090 | |
2091 | tag = m_tag_locate(m, KERNEL_MODULE_TAG_ID, |
2092 | KERNEL_TAG_TYPE_INET6, NULL); |
2093 | |
2094 | return (tag ? (struct ip6aux *)(tag + 1) : NULL); |
2095 | } |
2096 | |
2097 | void |
2098 | ip6_delaux(struct mbuf *m) |
2099 | { |
2100 | struct m_tag *tag; |
2101 | |
2102 | tag = m_tag_locate(m, KERNEL_MODULE_TAG_ID, |
2103 | KERNEL_TAG_TYPE_INET6, NULL); |
2104 | if (tag) { |
2105 | m_tag_delete(m, tag); |
2106 | } |
2107 | } |
2108 | |
2109 | /* |
2110 | * Drain callback |
2111 | */ |
2112 | void |
2113 | ip6_drain(void) |
2114 | { |
2115 | frag6_drain(); /* fragments */ |
2116 | in6_rtqdrain(); /* protocol cloned routes */ |
2117 | nd6_drain(NULL); /* cloned routes: ND6 */ |
2118 | } |
2119 | |
2120 | /* |
2121 | * System control for IP6 |
2122 | */ |
2123 | |
2124 | u_char inet6ctlerrmap[PRC_NCMDS] = { |
2125 | 0, 0, 0, 0, |
2126 | 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, |
2127 | EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, |
2128 | EMSGSIZE, EHOSTUNREACH, 0, 0, |
2129 | 0, 0, 0, 0, |
2130 | ENOPROTOOPT |
2131 | }; |
2132 | |
2133 | static int |
2134 | sysctl_reset_ip6_input_stats SYSCTL_HANDLER_ARGS |
2135 | { |
2136 | #pragma unused(arg1, arg2) |
2137 | int error, i; |
2138 | |
2139 | i = ip6_input_measure; |
2140 | error = sysctl_handle_int(oidp, &i, 0, req); |
2141 | if (error || req->newptr == USER_ADDR_NULL) |
2142 | goto done; |
2143 | /* impose bounds */ |
2144 | if (i < 0 || i > 1) { |
2145 | error = EINVAL; |
2146 | goto done; |
2147 | } |
2148 | if (ip6_input_measure != i && i == 1) { |
2149 | net_perf_initialize(&net_perf, ip6_input_measure_bins); |
2150 | } |
2151 | ip6_input_measure = i; |
2152 | done: |
2153 | return (error); |
2154 | } |
2155 | |
2156 | static int |
2157 | sysctl_ip6_input_measure_bins SYSCTL_HANDLER_ARGS |
2158 | { |
2159 | #pragma unused(arg1, arg2) |
2160 | int error; |
2161 | uint64_t i; |
2162 | |
2163 | i = ip6_input_measure_bins; |
2164 | error = sysctl_handle_quad(oidp, &i, 0, req); |
2165 | if (error || req->newptr == USER_ADDR_NULL) |
2166 | goto done; |
2167 | /* validate data */ |
2168 | if (!net_perf_validate_bins(i)) { |
2169 | error = EINVAL; |
2170 | goto done; |
2171 | } |
2172 | ip6_input_measure_bins = i; |
2173 | done: |
2174 | return (error); |
2175 | } |
2176 | |
2177 | static int |
2178 | sysctl_ip6_input_getperf SYSCTL_HANDLER_ARGS |
2179 | { |
2180 | #pragma unused(oidp, arg1, arg2) |
2181 | if (req->oldptr == USER_ADDR_NULL) |
2182 | req->oldlen = (size_t)sizeof (struct ipstat); |
2183 | |
2184 | return (SYSCTL_OUT(req, &net_perf, MIN(sizeof (net_perf), req->oldlen))); |
2185 | } |
2186 | |