Bug Summary

File:netinet/ipsec_input.c
Warning:line 594, column 2
Undefined or garbage value returned to caller

Annotated Source Code

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clang -cc1 -cc1 -triple amd64-unknown-openbsd7.4 -analyze -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name ipsec_input.c -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -mrelocation-model static -mframe-pointer=all -relaxed-aliasing -ffp-contract=on -fno-rounding-math -mconstructor-aliases -ffreestanding -mcmodel=kernel -target-cpu x86-64 -target-feature +retpoline-indirect-calls -target-feature +retpoline-indirect-branches -target-feature -sse2 -target-feature -sse -target-feature -3dnow -target-feature -mmx -target-feature +save-args -target-feature +retpoline-external-thunk -disable-red-zone -no-implicit-float -tune-cpu generic -debugger-tuning=gdb -fcoverage-compilation-dir=/usr/src/sys/arch/amd64/compile/GENERIC.MP/obj -nostdsysteminc -nobuiltininc -resource-dir /usr/local/llvm16/lib/clang/16 -I /usr/src/sys -I /usr/src/sys/arch/amd64/compile/GENERIC.MP/obj -I /usr/src/sys/arch -I /usr/src/sys/dev/pci/drm/include -I /usr/src/sys/dev/pci/drm/include/uapi -I /usr/src/sys/dev/pci/drm/amd/include/asic_reg -I /usr/src/sys/dev/pci/drm/amd/include -I /usr/src/sys/dev/pci/drm/amd/amdgpu -I /usr/src/sys/dev/pci/drm/amd/display -I /usr/src/sys/dev/pci/drm/amd/display/include -I /usr/src/sys/dev/pci/drm/amd/display/dc -I /usr/src/sys/dev/pci/drm/amd/display/amdgpu_dm -I /usr/src/sys/dev/pci/drm/amd/pm/inc -I /usr/src/sys/dev/pci/drm/amd/pm/legacy-dpm -I /usr/src/sys/dev/pci/drm/amd/pm/swsmu -I /usr/src/sys/dev/pci/drm/amd/pm/swsmu/inc -I /usr/src/sys/dev/pci/drm/amd/pm/swsmu/smu11 -I /usr/src/sys/dev/pci/drm/amd/pm/swsmu/smu12 -I /usr/src/sys/dev/pci/drm/amd/pm/swsmu/smu13 -I /usr/src/sys/dev/pci/drm/amd/pm/powerplay/inc -I /usr/src/sys/dev/pci/drm/amd/pm/powerplay/hwmgr -I /usr/src/sys/dev/pci/drm/amd/pm/powerplay/smumgr -I /usr/src/sys/dev/pci/drm/amd/pm/swsmu/inc -I /usr/src/sys/dev/pci/drm/amd/pm/swsmu/inc/pmfw_if -I /usr/src/sys/dev/pci/drm/amd/display/dc/inc -I /usr/src/sys/dev/pci/drm/amd/display/dc/inc/hw -I /usr/src/sys/dev/pci/drm/amd/display/dc/clk_mgr -I /usr/src/sys/dev/pci/drm/amd/display/modules/inc -I /usr/src/sys/dev/pci/drm/amd/display/modules/hdcp -I /usr/src/sys/dev/pci/drm/amd/display/dmub/inc -I /usr/src/sys/dev/pci/drm/i915 -D DDB -D DIAGNOSTIC -D KTRACE -D ACCOUNTING -D KMEMSTATS -D PTRACE -D POOL_DEBUG -D CRYPTO -D SYSVMSG -D SYSVSEM -D SYSVSHM -D UVM_SWAP_ENCRYPT -D FFS -D FFS2 -D FFS_SOFTUPDATES -D UFS_DIRHASH -D QUOTA -D EXT2FS -D MFS -D NFSCLIENT -D NFSSERVER -D CD9660 -D UDF -D MSDOSFS -D FIFO -D FUSE -D SOCKET_SPLICE -D TCP_ECN -D TCP_SIGNATURE -D INET6 -D IPSEC -D PPP_BSDCOMP -D PPP_DEFLATE -D PIPEX -D MROUTING -D MPLS -D BOOT_CONFIG -D USER_PCICONF -D APERTURE -D MTRR -D NTFS -D SUSPEND -D HIBERNATE -D PCIVERBOSE -D USBVERBOSE -D WSDISPLAY_COMPAT_USL -D WSDISPLAY_COMPAT_RAWKBD -D WSDISPLAY_DEFAULTSCREENS=6 -D X86EMU -D ONEWIREVERBOSE -D MULTIPROCESSOR -D MAXUSERS=80 -D _KERNEL -O2 -Wno-pointer-sign -Wno-address-of-packed-member -Wno-constant-conversion -Wno-unused-but-set-variable -Wno-gnu-folding-constant -fdebug-compilation-dir=/usr/src/sys/arch/amd64/compile/GENERIC.MP/obj -ferror-limit 19 -fwrapv -D_RET_PROTECTOR -ret-protector -fcf-protection=branch -fgnuc-version=4.2.1 -vectorize-loops -vectorize-slp -fno-builtin-malloc -fno-builtin-calloc -fno-builtin-realloc -fno-builtin-valloc -fno-builtin-free -fno-builtin-strdup -fno-builtin-strndup -analyzer-output=html -faddrsig -o /home/ben/Projects/scan/2024-01-11-110808-61670-1 -x c /usr/src/sys/netinet/ipsec_input.c
1/* $OpenBSD: ipsec_input.c,v 1.206 2023/09/16 09:33:27 mpi Exp $ */
2/*
3 * The authors of this code are John Ioannidis (ji@tla.org),
4 * Angelos D. Keromytis (kermit@csd.uch.gr) and
5 * Niels Provos (provos@physnet.uni-hamburg.de).
6 *
7 * This code was written by John Ioannidis for BSD/OS in Athens, Greece,
8 * in November 1995.
9 *
10 * Ported to OpenBSD and NetBSD, with additional transforms, in December 1996,
11 * by Angelos D. Keromytis.
12 *
13 * Additional transforms and features in 1997 and 1998 by Angelos D. Keromytis
14 * and Niels Provos.
15 *
16 * Additional features in 1999 by Angelos D. Keromytis.
17 *
18 * Copyright (C) 1995, 1996, 1997, 1998, 1999 by John Ioannidis,
19 * Angelos D. Keromytis and Niels Provos.
20 * Copyright (c) 2001, Angelos D. Keromytis.
21 *
22 * Permission to use, copy, and modify this software with or without fee
23 * is hereby granted, provided that this entire notice is included in
24 * all copies of any software which is or includes a copy or
25 * modification of this software.
26 * You may use this code under the GNU public license if you so wish. Please
27 * contribute changes back to the authors under this freer than GPL license
28 * so that we may further the use of strong encryption without limitations to
29 * all.
30 *
31 * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR
32 * IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY
33 * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE
34 * MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR
35 * PURPOSE.
36 */
37
38#include "pf.h"
39#include "sec.h"
40
41#include <sys/param.h>
42#include <sys/systm.h>
43#include <sys/protosw.h>
44#include <sys/mbuf.h>
45#include <sys/socket.h>
46#include <sys/sysctl.h>
47#include <sys/kernel.h>
48#include <sys/timeout.h>
49
50#include <net/if.h>
51#include <net/if_var.h>
52#include <net/netisr.h>
53#include <net/bpf.h>
54#include <net/route.h>
55
56#include <netinet/in.h>
57#include <netinet/ip.h>
58#include <netinet/ip_var.h>
59#include <netinet/ip_icmp.h>
60#include <netinet/tcp.h>
61#include <netinet/udp.h>
62
63#if NPF1 > 0
64#include <net/pfvar.h>
65#endif
66
67#if NSEC1 > 0
68#include <net/if_sec.h>
69#endif
70
71#ifdef INET61
72#include <netinet6/in6_var.h>
73#include <netinet/ip6.h>
74#include <netinet6/ip6_var.h>
75#endif /* INET6 */
76
77#include <netinet/ip_ipsp.h>
78#include <netinet/ip_esp.h>
79#include <netinet/ip_ah.h>
80#include <netinet/ip_ipcomp.h>
81
82#include <net/if_enc.h>
83
84#include <crypto/cryptodev.h>
85#include <crypto/xform.h>
86
87#include "bpfilter.h"
88
89void ipsec_common_ctlinput(u_int, int, struct sockaddr *, void *, int);
90
91#ifdef ENCDEBUG
92#define DPRINTF(fmt, args...)do { } while (0) \
93 do { \
94 if (encdebug) \
95 printf("%s: " fmt "\n", __func__, ## args); \
96 } while (0)
97#else
98#define DPRINTF(fmt, args...)do { } while (0) \
99 do { } while (0)
100#endif
101
102/* sysctl variables */
103int encdebug = 0;
104int ipsec_keep_invalid = IPSEC_DEFAULT_EMBRYONIC_SA_TIMEOUT60;
105int ipsec_require_pfs = IPSEC_DEFAULT_PFS1;
106int ipsec_soft_allocations = IPSEC_DEFAULT_SOFT_ALLOCATIONS0;
107int ipsec_exp_allocations = IPSEC_DEFAULT_EXP_ALLOCATIONS0;
108int ipsec_soft_bytes = IPSEC_DEFAULT_SOFT_BYTES0;
109int ipsec_exp_bytes = IPSEC_DEFAULT_EXP_BYTES0;
110int ipsec_soft_timeout = IPSEC_DEFAULT_SOFT_TIMEOUT80000;
111int ipsec_exp_timeout = IPSEC_DEFAULT_EXP_TIMEOUT86400;
112int ipsec_soft_first_use = IPSEC_DEFAULT_SOFT_FIRST_USE3600;
113int ipsec_exp_first_use = IPSEC_DEFAULT_EXP_FIRST_USE7200;
114int ipsec_expire_acquire = IPSEC_DEFAULT_EXPIRE_ACQUIRE30;
115
116int esp_enable = 1;
117int ah_enable = 1;
118int ipcomp_enable = 0;
119
120const struct sysctl_bounded_args espctl_vars[] = {
121 {ESPCTL_ENABLE1, &esp_enable, 0, 1},
122 {ESPCTL_UDPENCAP_ENABLE2, &udpencap_enable, 0, 1},
123 {ESPCTL_UDPENCAP_PORT3, &udpencap_port, 0, 65535},
124};
125const struct sysctl_bounded_args ahctl_vars[] = {
126 {AHCTL_ENABLE1, &ah_enable, 0, 1},
127};
128const struct sysctl_bounded_args ipcompctl_vars[] = {
129 {IPCOMPCTL_ENABLE1, &ipcomp_enable, 0, 1},
130};
131
132struct cpumem *espcounters;
133struct cpumem *ahcounters;
134struct cpumem *ipcompcounters;
135struct cpumem *ipseccounters;
136
137char ipsec_def_enc[20];
138char ipsec_def_auth[20];
139char ipsec_def_comp[20];
140
141const struct sysctl_bounded_args ipsecctl_vars[] = {
142 { IPSEC_ENCDEBUG12, &encdebug, 0, 1 },
143 { IPSEC_EXPIRE_ACQUIRE14, &ipsec_expire_acquire, 0, INT_MAX0x7fffffff },
144 { IPSEC_EMBRYONIC_SA_TIMEOUT15, &ipsec_keep_invalid, 0, INT_MAX0x7fffffff },
145 { IPSEC_REQUIRE_PFS16, &ipsec_require_pfs, 0, 1 },
146 { IPSEC_SOFT_ALLOCATIONS17, &ipsec_soft_allocations, 0, INT_MAX0x7fffffff },
147 { IPSEC_ALLOCATIONS18, &ipsec_exp_allocations, 0, INT_MAX0x7fffffff },
148 { IPSEC_SOFT_BYTES19, &ipsec_soft_bytes, 0, INT_MAX0x7fffffff },
149 { IPSEC_BYTES20, &ipsec_exp_bytes, 0, INT_MAX0x7fffffff },
150 { IPSEC_TIMEOUT21, &ipsec_exp_timeout, 0, INT_MAX0x7fffffff },
151 { IPSEC_SOFT_TIMEOUT22, &ipsec_soft_timeout,0, INT_MAX0x7fffffff },
152 { IPSEC_SOFT_FIRSTUSE23, &ipsec_soft_first_use, 0, INT_MAX0x7fffffff },
153 { IPSEC_FIRSTUSE24, &ipsec_exp_first_use, 0, INT_MAX0x7fffffff },
154};
155
156int esp_sysctl_espstat(void *, size_t *, void *);
157int ah_sysctl_ahstat(void *, size_t *, void *);
158int ipcomp_sysctl_ipcompstat(void *, size_t *, void *);
159int ipsec_sysctl_ipsecstat(void *, size_t *, void *);
160
161void
162ipsec_init(void)
163{
164 espcounters = counters_alloc(esps_ncounters);
165 ahcounters = counters_alloc(ahs_ncounters);
166 ipcompcounters = counters_alloc(ipcomps_ncounters);
167 ipseccounters = counters_alloc(ipsec_ncounters);
168
169 strlcpy(ipsec_def_enc, IPSEC_DEFAULT_DEF_ENC"aes", sizeof(ipsec_def_enc));
170 strlcpy(ipsec_def_auth, IPSEC_DEFAULT_DEF_AUTH"hmac-sha1", sizeof(ipsec_def_auth));
171 strlcpy(ipsec_def_comp, IPSEC_DEFAULT_DEF_COMP"deflate", sizeof(ipsec_def_comp));
172
173 ipsp_init();
174}
175
176/*
177 * ipsec_common_input() gets called when we receive an IPsec-protected packet
178 * in IPv4 or IPv6. All it does is find the right TDB and call the appropriate
179 * transform. The callback takes care of further processing (like ingress
180 * filtering).
181 */
182int
183ipsec_common_input(struct mbuf **mp, int skip, int protoff, int af, int sproto,
184 int udpencap)
185{
186#define IPSEC_ISTAT(x,y,z) do { \
187 if (sproto == IPPROTO_ESP50) \
188 espstat_inc(x); \
189 else if (sproto == IPPROTO_AH51) \
190 ahstat_inc(y); \
191 else \
192 ipcompstat_inc(z); \
193} while (0)
194
195 struct mbuf *m = *mp;
196 union sockaddr_union dst_address;
197 struct tdb *tdbp = NULL((void *)0);
198 u_int32_t spi;
199 u_int16_t cpi;
200 int prot;
201#ifdef ENCDEBUG
202 char buf[INET6_ADDRSTRLEN46];
203#endif
204
205 NET_ASSERT_LOCKED()do { int _s = rw_status(&netlock); if ((splassert_ctl >
0) && (_s != 0x0001UL && _s != 0x0002UL)) splassert_fail
(0x0002UL, _s, __func__); } while (0);
206
207 ipsecstat_pkt(ipsec_ipackets, ipsec_ibytes, m->m_pkthdrM_dat.MH.MH_pkthdr.len);
208 IPSEC_ISTAT(esps_input, ahs_input, ipcomps_input);
209
210 if ((sproto == IPPROTO_IPCOMP108) && (m->m_flagsm_hdr.mh_flags & M_COMP0x4000)) {
211 DPRINTF("repeated decompression")do { } while (0);
212 ipcompstat_inc(ipcomps_pdrops);
213 goto drop;
214 }
215
216 if (m->m_pkthdrM_dat.MH.MH_pkthdr.len - skip < 2 * sizeof(u_int32_t)) {
217 DPRINTF("packet too small")do { } while (0);
218 IPSEC_ISTAT(esps_hdrops, ahs_hdrops, ipcomps_hdrops);
219 goto drop;
220 }
221
222 /* Retrieve the SPI from the relevant IPsec header */
223 switch (sproto) {
224 case IPPROTO_ESP50:
225 m_copydata(m, skip, sizeof(u_int32_t), (caddr_t) &spi);
226 break;
227 case IPPROTO_AH51:
228 m_copydata(m, skip + sizeof(u_int32_t), sizeof(u_int32_t),
229 (caddr_t) &spi);
230 break;
231 case IPPROTO_IPCOMP108:
232 m_copydata(m, skip + sizeof(u_int16_t), sizeof(u_int16_t),
233 (caddr_t) &cpi);
234 spi = ntohl(htons(cpi))(__uint32_t)(__builtin_constant_p((__uint16_t)(__builtin_constant_p
(cpi) ? (__uint16_t)(((__uint16_t)(cpi) & 0xffU) <<
8 | ((__uint16_t)(cpi) & 0xff00U) >> 8) : __swap16md
(cpi))) ? (__uint32_t)(((__uint32_t)((__uint16_t)(__builtin_constant_p
(cpi) ? (__uint16_t)(((__uint16_t)(cpi) & 0xffU) <<
8 | ((__uint16_t)(cpi) & 0xff00U) >> 8) : __swap16md
(cpi))) & 0xff) << 24 | ((__uint32_t)((__uint16_t)(
__builtin_constant_p(cpi) ? (__uint16_t)(((__uint16_t)(cpi) &
0xffU) << 8 | ((__uint16_t)(cpi) & 0xff00U) >>
8) : __swap16md(cpi))) & 0xff00) << 8 | ((__uint32_t
)((__uint16_t)(__builtin_constant_p(cpi) ? (__uint16_t)(((__uint16_t
)(cpi) & 0xffU) << 8 | ((__uint16_t)(cpi) & 0xff00U
) >> 8) : __swap16md(cpi))) & 0xff0000) >> 8 |
((__uint32_t)((__uint16_t)(__builtin_constant_p(cpi) ? (__uint16_t
)(((__uint16_t)(cpi) & 0xffU) << 8 | ((__uint16_t)(
cpi) & 0xff00U) >> 8) : __swap16md(cpi))) & 0xff000000
) >> 24) : __swap32md((__uint16_t)(__builtin_constant_p
(cpi) ? (__uint16_t)(((__uint16_t)(cpi) & 0xffU) <<
8 | ((__uint16_t)(cpi) & 0xff00U) >> 8) : __swap16md
(cpi))));
235 break;
236 default:
237 panic("%s: unknown/unsupported security protocol %d",
238 __func__, sproto);
239 }
240
241 /*
242 * Find tunnel control block and (indirectly) call the appropriate
243 * kernel crypto routine. The resulting mbuf chain is a valid
244 * IP packet ready to go through input processing.
245 */
246
247 memset(&dst_address, 0, sizeof(dst_address))__builtin_memset((&dst_address), (0), (sizeof(dst_address
)));
248 dst_address.sa.sa_family = af;
249
250 switch (af) {
251 case AF_INET2:
252 dst_address.sin.sin_len = sizeof(struct sockaddr_in);
253 m_copydata(m, offsetof(struct ip, ip_dst)__builtin_offsetof(struct ip, ip_dst),
254 sizeof(struct in_addr),
255 (caddr_t) &(dst_address.sin.sin_addr));
256 break;
257
258#ifdef INET61
259 case AF_INET624:
260 dst_address.sin6.sin6_len = sizeof(struct sockaddr_in6);
261 m_copydata(m, offsetof(struct ip6_hdr, ip6_dst)__builtin_offsetof(struct ip6_hdr, ip6_dst),
262 sizeof(struct in6_addr),
263 (caddr_t) &(dst_address.sin6.sin6_addr));
264 in6_recoverscope(&dst_address.sin6,
265 &dst_address.sin6.sin6_addr);
266 break;
267#endif /* INET6 */
268
269 default:
270 DPRINTF("unsupported protocol family %d", af)do { } while (0);
271 IPSEC_ISTAT(esps_nopf, ahs_nopf, ipcomps_nopf);
272 goto drop;
273 }
274
275 tdbp = gettdb(rtable_l2(m->m_pkthdr.ph_rtableid),gettdb_dir((rtable_l2(m->M_dat.MH.MH_pkthdr.ph_rtableid)),
(spi),(&dst_address),(sproto),0)
276 spi, &dst_address, sproto)gettdb_dir((rtable_l2(m->M_dat.MH.MH_pkthdr.ph_rtableid)),
(spi),(&dst_address),(sproto),0);
277 if (tdbp == NULL((void *)0)) {
278 DPRINTF("could not find SA for packet to %s, spi %08x",do { } while (0)
279 ipsp_address(&dst_address, buf, sizeof(buf)), ntohl(spi))do { } while (0);
280 IPSEC_ISTAT(esps_notdb, ahs_notdb, ipcomps_notdb);
281 goto drop;
282 }
283
284 if (tdbp->tdb_flags & TDBF_INVALID0x00010) {
285 DPRINTF("attempted to use invalid SA %s/%08x/%u",do { } while (0)
286 ipsp_address(&dst_address, buf, sizeof(buf)),do { } while (0)
287 ntohl(spi), tdbp->tdb_sproto)do { } while (0);
288 IPSEC_ISTAT(esps_invalid, ahs_invalid, ipcomps_invalid);
289 goto drop;
290 }
291
292 if (udpencap && !(tdbp->tdb_flags & TDBF_UDPENCAP0x20000)) {
293 DPRINTF("attempted to use non-udpencap SA %s/%08x/%u",do { } while (0)
294 ipsp_address(&dst_address, buf, sizeof(buf)),do { } while (0)
295 ntohl(spi), tdbp->tdb_sproto)do { } while (0);
296 espstat_inc(esps_udpinval);
297 goto drop;
298 }
299
300 if (!udpencap && (tdbp->tdb_flags & TDBF_UDPENCAP0x20000)) {
301 DPRINTF("attempted to use udpencap SA %s/%08x/%u",do { } while (0)
302 ipsp_address(&dst_address, buf, sizeof(buf)),do { } while (0)
303 ntohl(spi), tdbp->tdb_sproto)do { } while (0);
304 espstat_inc(esps_udpneeded);
305 goto drop;
306 }
307
308 if (tdbp->tdb_xform == NULL((void *)0)) {
309 DPRINTF("attempted to use uninitialized SA %s/%08x/%u",do { } while (0)
310 ipsp_address(&dst_address, buf, sizeof(buf)),do { } while (0)
311 ntohl(spi), tdbp->tdb_sproto)do { } while (0);
312 IPSEC_ISTAT(esps_noxform, ahs_noxform, ipcomps_noxform);
313 goto drop;
314 }
315
316 KERNEL_LOCK()_kernel_lock();
317 /* Register first use, setup expiration timer. */
318 if (tdbp->tdb_first_use == 0) {
319 tdbp->tdb_first_use = gettime();
320 if (tdbp->tdb_flags & TDBF_FIRSTUSE0x00020) {
321 if (timeout_add_sec(&tdbp->tdb_first_tmo,
322 tdbp->tdb_exp_first_use))
323 tdb_ref(tdbp);
324 }
325 if (tdbp->tdb_flags & TDBF_SOFT_FIRSTUSE0x00400) {
326 if (timeout_add_sec(&tdbp->tdb_sfirst_tmo,
327 tdbp->tdb_soft_first_use))
328 tdb_ref(tdbp);
329 }
330 }
331
332 tdbstat_pkt(tdbp, tdb_ipackets, tdb_ibytes, m->m_pkthdrM_dat.MH.MH_pkthdr.len);
333
334 /*
335 * Call appropriate transform and return -- callback takes care of
336 * everything else.
337 */
338 prot = (*(tdbp->tdb_xform->xf_input))(mp, tdbp, skip, protoff);
339 if (prot == IPPROTO_DONE257) {
340 ipsecstat_inc(ipsec_idrops);
341 tdbstat_inc(tdbp, tdb_idrops);
342 }
343 tdb_unref(tdbp);
344 KERNEL_UNLOCK()_kernel_unlock();
345 return prot;
346
347 drop:
348 m_freemp(mp);
349 ipsecstat_inc(ipsec_idrops);
350 if (tdbp != NULL((void *)0))
351 tdbstat_inc(tdbp, tdb_idrops);
352 tdb_unref(tdbp);
353 return IPPROTO_DONE257;
354}
355
356/*
357 * IPsec input callback, called by the transform callback. Takes care of
358 * filtering and other sanity checks on the processed packet.
359 */
360int
361ipsec_common_input_cb(struct mbuf **mp, struct tdb *tdbp, int skip, int protoff)
362{
363 struct mbuf *m = *mp;
364 int af, sproto;
365 u_int8_t prot;
1
'prot' declared without an initial value
→
366#if NBPFILTER1 > 0
367 struct ifnet *encif;
368#endif
369 struct ip *ip;
370#ifdef INET61
371 struct ip6_hdr *ip6;
372#endif /* INET6 */
373 struct m_tag *mtag;
374 struct tdb_ident *tdbi;
375#ifdef ENCDEBUG
376 char buf[INET6_ADDRSTRLEN46];
377#endif
378
379 af = tdbp->tdb_dst.sa.sa_family;
380 sproto = tdbp->tdb_sproto;
381
382 tdbp->tdb_last_used = gettime();
383
384 /* Fix IPv4 header */
385 if (af == AF_INET2) {
2
←
Assuming 'af' is not equal to AF_INET
→
3
←
Taking false branch
→
386 if (m->m_lenm_hdr.mh_len < skip &&
387 (m = *mp = m_pullup(m, skip)) == NULL((void *)0)) {
388 DPRINTF("processing failed for SA %s/%08x",do { } while (0)
389 ipsp_address(&tdbp->tdb_dst, buf, sizeof(buf)),do { } while (0)
390 ntohl(tdbp->tdb_spi))do { } while (0);
391 IPSEC_ISTAT(esps_hdrops, ahs_hdrops, ipcomps_hdrops);
392 goto baddone;
393 }
394
395 ip = mtod(m, struct ip *)((struct ip *)((m)->m_hdr.mh_data));
396 ip->ip_len = htons(m->m_pkthdr.len)(__uint16_t)(__builtin_constant_p(m->M_dat.MH.MH_pkthdr.len
) ? (__uint16_t)(((__uint16_t)(m->M_dat.MH.MH_pkthdr.len) &
0xffU) << 8 | ((__uint16_t)(m->M_dat.MH.MH_pkthdr.len
) & 0xff00U) >> 8) : __swap16md(m->M_dat.MH.MH_pkthdr
.len));
397 in_hdr_cksum_out(m, NULL((void *)0));
398 prot = ip->ip_p;
399 }
400
401#ifdef INET61
402 /* Fix IPv6 header */
403 if (af == AF_INET624) {
4
←
Assuming 'af' is not equal to AF_INET6
→
404 if (m->m_lenm_hdr.mh_len < sizeof(struct ip6_hdr) &&
405 (m = *mp = m_pullup(m, sizeof(struct ip6_hdr))) == NULL((void *)0)) {
406
407 DPRINTF("processing failed for SA %s/%08x",do { } while (0)
408 ipsp_address(&tdbp->tdb_dst, buf, sizeof(buf)),do { } while (0)
409 ntohl(tdbp->tdb_spi))do { } while (0);
410 IPSEC_ISTAT(esps_hdrops, ahs_hdrops, ipcomps_hdrops);
411 goto baddone;
412 }
413
414 ip6 = mtod(m, struct ip6_hdr *)((struct ip6_hdr *)((m)->m_hdr.mh_data));
415 ip6->ip6_plenip6_ctlun.ip6_un1.ip6_un1_plen = htons(m->m_pkthdr.len - skip)(__uint16_t)(__builtin_constant_p(m->M_dat.MH.MH_pkthdr.len
- skip) ? (__uint16_t)(((__uint16_t)(m->M_dat.MH.MH_pkthdr
.len - skip) & 0xffU) << 8 | ((__uint16_t)(m->M_dat
.MH.MH_pkthdr.len - skip) & 0xff00U) >> 8) : __swap16md
(m->M_dat.MH.MH_pkthdr.len - skip));
416
417 /* Save protocol */
418 m_copydata(m, protoff, 1, (caddr_t) &prot);
419 }
420#endif /* INET6 */
421
422 /*
423 * Fix TCP/UDP checksum of UDP encapsulated transport mode ESP packet.
424 * (RFC3948 3.1.2)
425 */
426 if ((af
4.1
'af' is not equal to AF_INET
 == AF_INET2 || af
4.2
'af' is not equal to AF_INET6
 == AF_INET624) &&
427 (tdbp->tdb_flags & TDBF_UDPENCAP0x20000) &&
428 (tdbp->tdb_flags & TDBF_TUNNELING0x01000) == 0) {
429 u_int16_t cksum;
430
431 switch (prot) {
432 case IPPROTO_UDP17:
433 if (m->m_pkthdrM_dat.MH.MH_pkthdr.len < skip + sizeof(struct udphdr)) {
434 IPSEC_ISTAT(esps_hdrops, ahs_hdrops,
435 ipcomps_hdrops);
436 goto baddone;
437 }
438 cksum = 0;
439 m_copyback(m, skip + offsetof(struct udphdr, uh_sum)__builtin_offsetof(struct udphdr, uh_sum),
440 sizeof(cksum), &cksum, M_NOWAIT0x0002);
441#ifdef INET61
442 if (af == AF_INET624) {
443 cksum = in6_cksum(m, IPPROTO_UDP17, skip,
444 m->m_pkthdrM_dat.MH.MH_pkthdr.len - skip);
445 m_copyback(m, skip + offsetof(struct udphdr,__builtin_offsetof(struct udphdr, uh_sum)
446 uh_sum)__builtin_offsetof(struct udphdr, uh_sum), sizeof(cksum), &cksum, M_NOWAIT0x0002);
447 }
448#endif
449 break;
450 case IPPROTO_TCP6:
451 if (m->m_pkthdrM_dat.MH.MH_pkthdr.len < skip + sizeof(struct tcphdr)) {
452 IPSEC_ISTAT(esps_hdrops, ahs_hdrops,
453 ipcomps_hdrops);
454 goto baddone;
455 }
456 cksum = 0;
457 m_copyback(m, skip + offsetof(struct tcphdr, th_sum)__builtin_offsetof(struct tcphdr, th_sum),
458 sizeof(cksum), &cksum, M_NOWAIT0x0002);
459 if (af == AF_INET2)
460 cksum = in4_cksum(m, IPPROTO_TCP6, skip,
461 m->m_pkthdrM_dat.MH.MH_pkthdr.len - skip);
462#ifdef INET61
463 else if (af == AF_INET624)
464 cksum = in6_cksum(m, IPPROTO_TCP6, skip,
465 m->m_pkthdrM_dat.MH.MH_pkthdr.len - skip);
466#endif
467 m_copyback(m, skip + offsetof(struct tcphdr, th_sum)__builtin_offsetof(struct tcphdr, th_sum),
468 sizeof(cksum), &cksum, M_NOWAIT0x0002);
469 break;
470 }
471 }
472
473 /*
474 * Record what we've done to the packet (under what SA it was
475 * processed).
476 */
477 if (tdbp->tdb_sproto != IPPROTO_IPCOMP108) {
5
←
Assuming field 'tdb_sproto' is equal to IPPROTO_IPCOMP
→
6
←
Taking false branch
→
478 mtag = m_tag_get(PACKET_TAG_IPSEC_IN_DONE0x0001,
479 sizeof(struct tdb_ident), M_NOWAIT0x0002);
480 if (mtag == NULL((void *)0)) {
481 DPRINTF("failed to get tag")do { } while (0);
482 IPSEC_ISTAT(esps_hdrops, ahs_hdrops, ipcomps_hdrops);
483 goto baddone;
484 }
485
486 tdbi = (struct tdb_ident *)(mtag + 1);
487 tdbi->dst = tdbp->tdb_dst;
488 tdbi->proto = tdbp->tdb_sproto;
489 tdbi->spi = tdbp->tdb_spi;
490 tdbi->rdomain = tdbp->tdb_rdomain;
491
492 m_tag_prepend(m, mtag);
493 }
494
495 switch (sproto) {
7
←
Control jumps to 'case 108:' at line 508
→
496 case IPPROTO_ESP50:
497 /* Packet is confidential ? */
498 if (tdbp->tdb_encalgxform)
499 m->m_flagsm_hdr.mh_flags |= M_CONF0x0400;
500
501 /* Check if we had authenticated ESP. */
502 if (tdbp->tdb_authalgxform)
503 m->m_flagsm_hdr.mh_flags |= M_AUTH0x0800;
504 break;
505 case IPPROTO_AH51:
506 m->m_flagsm_hdr.mh_flags |= M_AUTH0x0800;
507 break;
508 case IPPROTO_IPCOMP108:
509 m->m_flagsm_hdr.mh_flags |= M_COMP0x4000;
510 break;
511 default:
512 panic("%s: unknown/unsupported security protocol %d",
513 __func__, sproto);
514 }
515
516#if NPF1 > 0
517 /* Add pf tag if requested. */
518 pf_tag_packet(m, tdbp->tdb_tag, -1);
519 pf_pkt_addr_changed(m);
520#endif
521 if (tdbp->tdb_rdomain != tdbp->tdb_rdomain_post)
8
←
Assuming field 'tdb_rdomain' is equal to field 'tdb_rdomain_post'
→
9
←
Taking false branch
→
522 m->m_pkthdrM_dat.MH.MH_pkthdr.ph_rtableid = tdbp->tdb_rdomain_post;
523
524 if (tdbp->tdb_flags & TDBF_TUNNELING0x01000)
10
←
Assuming the condition is true
→
11
←
Taking true branch
→
525 m->m_flagsm_hdr.mh_flags |= M_TUNNEL0x1000;
526
527 ipsecstat_add(ipsec_idecompbytes, m->m_pkthdrM_dat.MH.MH_pkthdr.len);
528 tdbstat_add(tdbp, tdb_idecompbytes, m->m_pkthdrM_dat.MH.MH_pkthdr.len);
529
530#if NBPFILTER1 > 0
531 encif = enc_getif(tdbp->tdb_rdomain_post, tdbp->tdb_tap);
532 if (encif != NULL((void *)0)) {
12
←
Assuming 'encif' is equal to NULL
→
13
←
Taking false branch
→
533 encif->if_ipacketsif_data.ifi_ipackets++;
534 encif->if_ibytesif_data.ifi_ibytes += m->m_pkthdrM_dat.MH.MH_pkthdr.len;
535
536 if (sproto != IPPROTO_IPCOMP108) {
537 /* XXX This conflicts with the scoped nature of IPv6 */
538 m->m_pkthdrM_dat.MH.MH_pkthdr.ph_ifidx = encif->if_index;
539 }
540 if (encif->if_bpf) {
541 struct enchdr hdr;
542
543 hdr.af = af;
544 hdr.spi = tdbp->tdb_spi;
545 hdr.flags = m->m_flagsm_hdr.mh_flags & (M_AUTH0x0800|M_CONF0x0400);
546
547 bpf_mtap_hdr(encif->if_bpf, (char *)&hdr,
548 ENC_HDRLEN12, m, BPF_DIRECTION_IN(1 << 0));
549 }
550 }
551#endif
552
553 if (ISSET(tdbp->tdb_flags, TDBF_IFACE)((tdbp->tdb_flags) & (0x400000))) {
14
←
Assuming the condition is false
→
15
←
Taking false branch
→
554#if NSEC1 > 0
555 if (ISSET(tdbp->tdb_flags, TDBF_TUNNELING)((tdbp->tdb_flags) & (0x01000)) &&
556 tdbp->tdb_iface_dir == IPSP_DIRECTION_IN0x1) {
557 struct sec_softc *sc = sec_get(tdbp->tdb_iface);
558 if (sc == NULL((void *)0))
559 goto baddone;
560
561 sec_input(sc, af, prot, m);
562 sec_put(sc);
563 return IPPROTO_DONE257;
564 }
565#endif /* NSEC > 0 */
566 goto baddone;
567 }
568
569#if NPF1 > 0
570 /*
571 * The ip_deliver() shortcut avoids running through ip_input() with the
572 * same IP header twice. Packets in transport mode have to be be
573 * passed to pf explicitly. In tunnel mode the inner IP header will
574 * run through ip_input() and pf anyway.
575 */
576 if ((tdbp->tdb_flags & TDBF_TUNNELING0x01000) == 0) {
16
←
Taking false branch
→
577 struct ifnet *ifp;
578
579 /* This is the enc0 interface unless for ipcomp. */
580 if ((ifp = if_get(m->m_pkthdrM_dat.MH.MH_pkthdr.ph_ifidx)) == NULL((void *)0)) {
581 goto baddone;
582 }
583 if (pf_test(af, PF_IN, ifp, mp) != PF_PASS) {
584 if_put(ifp);
585 goto baddone;
586 }
587 m = *mp;
588 if_put(ifp);
589 if (m == NULL((void *)0))
590 return IPPROTO_DONE257;
591 }
592#endif
593 /* Return to the appropriate protocol handler in deliver loop. */
594 return prot;
17
←
Undefined or garbage value returned to caller
595
596 baddone:
597 m_freemp(mp);
598 return IPPROTO_DONE257;
599#undef IPSEC_ISTAT
600}
601
602int
603ipsec_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp,
604 size_t newlen)
605{
606 int error;
607
608 switch (name[0]) {
609 case IPCTL_IPSEC_ENC_ALGORITHM25:
610 NET_LOCK()do { rw_enter_write(&netlock); } while (0);
611 error = sysctl_tstring(oldp, oldlenp, newp, newlen,
612 ipsec_def_enc, sizeof(ipsec_def_enc));
613 NET_UNLOCK()do { rw_exit_write(&netlock); } while (0);
614 return (error);
615 case IPCTL_IPSEC_AUTH_ALGORITHM26:
616 NET_LOCK()do { rw_enter_write(&netlock); } while (0);
617 error = sysctl_tstring(oldp, oldlenp, newp, newlen,
618 ipsec_def_auth, sizeof(ipsec_def_auth));
619 NET_UNLOCK()do { rw_exit_write(&netlock); } while (0);
620 return (error);
621 case IPCTL_IPSEC_IPCOMP_ALGORITHM29:
622 NET_LOCK()do { rw_enter_write(&netlock); } while (0);
623 error = sysctl_tstring(oldp, oldlenp, newp, newlen,
624 ipsec_def_comp, sizeof(ipsec_def_comp));
625 NET_UNLOCK()do { rw_exit_write(&netlock); } while (0);
626 return (error);
627 case IPCTL_IPSEC_STATS13:
628 return (ipsec_sysctl_ipsecstat(oldp, oldlenp, newp));
629 default:
630 NET_LOCK()do { rw_enter_write(&netlock); } while (0);
631 error = sysctl_bounded_arr(ipsecctl_vars, nitems(ipsecctl_vars)(sizeof((ipsecctl_vars)) / sizeof((ipsecctl_vars)[0])),
632 name, namelen, oldp, oldlenp, newp, newlen);
633 NET_UNLOCK()do { rw_exit_write(&netlock); } while (0);
634 return (error);
635 }
636}
637
638int
639esp_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp,
640 size_t newlen)
641{
642 int error;
643
644 /* All sysctl names at this level are terminal. */
645 if (namelen != 1)
646 return (ENOTDIR20);
647
648 switch (name[0]) {
649 case ESPCTL_STATS4:
650 return (esp_sysctl_espstat(oldp, oldlenp, newp));
651 default:
652 NET_LOCK()do { rw_enter_write(&netlock); } while (0);
653 error = sysctl_bounded_arr(espctl_vars, nitems(espctl_vars)(sizeof((espctl_vars)) / sizeof((espctl_vars)[0])),
654 name, namelen, oldp, oldlenp, newp, newlen);
655 NET_UNLOCK()do { rw_exit_write(&netlock); } while (0);
656 return (error);
657 }
658}
659
660int
661esp_sysctl_espstat(void *oldp, size_t *oldlenp, void *newp)
662{
663 struct espstat espstat;
664
665 CTASSERT(sizeof(espstat) == (esps_ncounters * sizeof(uint64_t)))extern char _ctassert[(sizeof(espstat) == (esps_ncounters * sizeof
(uint64_t))) ? 1 : -1 ] __attribute__((__unused__));
666 memset(&espstat, 0, sizeof espstat)__builtin_memset((&espstat), (0), (sizeof espstat));
667 counters_read(espcounters, (uint64_t *)&espstat, esps_ncounters, NULL((void *)0));
668 return (sysctl_rdstruct(oldp, oldlenp, newp, &espstat,
669 sizeof(espstat)));
670}
671
672int
673ah_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp,
674 size_t newlen)
675{
676 int error;
677
678 /* All sysctl names at this level are terminal. */
679 if (namelen != 1)
680 return (ENOTDIR20);
681
682 switch (name[0]) {
683 case AHCTL_STATS2:
684 return ah_sysctl_ahstat(oldp, oldlenp, newp);
685 default:
686 NET_LOCK()do { rw_enter_write(&netlock); } while (0);
687 error = sysctl_bounded_arr(ahctl_vars, nitems(ahctl_vars)(sizeof((ahctl_vars)) / sizeof((ahctl_vars)[0])), name,
688 namelen, oldp, oldlenp, newp, newlen);
689 NET_UNLOCK()do { rw_exit_write(&netlock); } while (0);
690 return (error);
691 }
692}
693
694int
695ah_sysctl_ahstat(void *oldp, size_t *oldlenp, void *newp)
696{
697 struct ahstat ahstat;
698
699 CTASSERT(sizeof(ahstat) == (ahs_ncounters * sizeof(uint64_t)))extern char _ctassert[(sizeof(ahstat) == (ahs_ncounters * sizeof
(uint64_t))) ? 1 : -1 ] __attribute__((__unused__));
700 memset(&ahstat, 0, sizeof ahstat)__builtin_memset((&ahstat), (0), (sizeof ahstat));
701 counters_read(ahcounters, (uint64_t *)&ahstat, ahs_ncounters, NULL((void *)0));
702 return (sysctl_rdstruct(oldp, oldlenp, newp, &ahstat, sizeof(ahstat)));
703}
704
705int
706ipcomp_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp,
707 size_t newlen)
708{
709 int error;
710
711 /* All sysctl names at this level are terminal. */
712 if (namelen != 1)
713 return (ENOTDIR20);
714
715 switch (name[0]) {
716 case IPCOMPCTL_STATS2:
717 return ipcomp_sysctl_ipcompstat(oldp, oldlenp, newp);
718 default:
719 NET_LOCK()do { rw_enter_write(&netlock); } while (0);
720 error = sysctl_bounded_arr(ipcompctl_vars,
721 nitems(ipcompctl_vars)(sizeof((ipcompctl_vars)) / sizeof((ipcompctl_vars)[0])), name, namelen, oldp, oldlenp,
722 newp, newlen);
723 NET_UNLOCK()do { rw_exit_write(&netlock); } while (0);
724 return (error);
725 }
726}
727
728int
729ipcomp_sysctl_ipcompstat(void *oldp, size_t *oldlenp, void *newp)
730{
731 struct ipcompstat ipcompstat;
732
733 CTASSERT(sizeof(ipcompstat) == (ipcomps_ncounters * sizeof(uint64_t)))extern char _ctassert[(sizeof(ipcompstat) == (ipcomps_ncounters
* sizeof(uint64_t))) ? 1 : -1 ] __attribute__((__unused__));
734 memset(&ipcompstat, 0, sizeof ipcompstat)__builtin_memset((&ipcompstat), (0), (sizeof ipcompstat));
735 counters_read(ipcompcounters, (uint64_t *)&ipcompstat,
736 ipcomps_ncounters, NULL((void *)0));
737 return (sysctl_rdstruct(oldp, oldlenp, newp, &ipcompstat,
738 sizeof(ipcompstat)));
739}
740
741int
742ipsec_sysctl_ipsecstat(void *oldp, size_t *oldlenp, void *newp)
743{
744 struct ipsecstat ipsecstat;
745
746 CTASSERT(sizeof(ipsecstat) == (ipsec_ncounters * sizeof(uint64_t)))extern char _ctassert[(sizeof(ipsecstat) == (ipsec_ncounters *
sizeof(uint64_t))) ? 1 : -1 ] __attribute__((__unused__));
747 memset(&ipsecstat, 0, sizeof ipsecstat)__builtin_memset((&ipsecstat), (0), (sizeof ipsecstat));
748 counters_read(ipseccounters, (uint64_t *)&ipsecstat, ipsec_ncounters,
749 NULL((void *)0));
750 return (sysctl_rdstruct(oldp, oldlenp, newp, &ipsecstat,
751 sizeof(ipsecstat)));
752}
753
754int
755ipsec_input_disabled(struct mbuf **mp, int *offp, int proto, int af)
756{
757 switch (af) {
758 case AF_INET2:
759 return rip_input(mp, offp, proto, af);
760#ifdef INET61
761 case AF_INET624:
762 return rip6_input(mp, offp, proto, af);
763#endif
764 default:
765 unhandled_af(af);
766 }
767}
768
769int
770ah46_input(struct mbuf **mp, int *offp, int proto, int af)
771{
772 int protoff;
773
774 if (
775#if NPF1 > 0
776 ((*mp)->m_pkthdrM_dat.MH.MH_pkthdr.pf.flags & PF_TAG_DIVERTED0x08) ||
777#endif
778 !ah_enable)
779 return ipsec_input_disabled(mp, offp, proto, af);
780
781 protoff = ipsec_protoff(*mp, *offp, af);
782 if (protoff < 0) {
783 DPRINTF("bad packet header chain")do { } while (0);
784 ahstat_inc(ahs_hdrops);
785 m_freemp(mp);
786 return IPPROTO_DONE257;
787 }
788
789 return ipsec_common_input(mp, *offp, protoff, af, proto, 0);
790}
791
792void
793ah4_ctlinput(int cmd, struct sockaddr *sa, u_int rdomain, void *v)
794{
795 if (sa->sa_family != AF_INET2 ||
796 sa->sa_len != sizeof(struct sockaddr_in))
797 return;
798
799 ipsec_common_ctlinput(rdomain, cmd, sa, v, IPPROTO_AH51);
800}
801
802int
803esp46_input(struct mbuf **mp, int *offp, int proto, int af)
804{
805 int protoff;
806
807 if (
808#if NPF1 > 0
809 ((*mp)->m_pkthdrM_dat.MH.MH_pkthdr.pf.flags & PF_TAG_DIVERTED0x08) ||
810#endif
811 !esp_enable)
812 return ipsec_input_disabled(mp, offp, proto, af);
813
814 protoff = ipsec_protoff(*mp, *offp, af);
815 if (protoff < 0) {
816 DPRINTF("bad packet header chain")do { } while (0);
817 espstat_inc(esps_hdrops);
818 m_freemp(mp);
819 return IPPROTO_DONE257;
820 }
821
822 return ipsec_common_input(mp, *offp, protoff, af, proto, 0);
823}
824
825/* IPv4 IPCOMP wrapper */
826int
827ipcomp46_input(struct mbuf **mp, int *offp, int proto, int af)
828{
829 int protoff;
830
831 if (
832#if NPF1 > 0
833 ((*mp)->m_pkthdrM_dat.MH.MH_pkthdr.pf.flags & PF_TAG_DIVERTED0x08) ||
834#endif
835 !ipcomp_enable)
836 return ipsec_input_disabled(mp, offp, proto, af);
837
838 protoff = ipsec_protoff(*mp, *offp, af);
839 if (protoff < 0) {
840 DPRINTF("bad packet header chain")do { } while (0);
841 ipcompstat_inc(ipcomps_hdrops);
842 m_freemp(mp);
843 return IPPROTO_DONE257;
844 }
845
846 return ipsec_common_input(mp, *offp, protoff, af, proto, 0);
847}
848
849void
850ipsec_set_mtu(struct tdb *tdbp, u_int32_t mtu)
851{
852 ssize_t adjust;
853
854 NET_ASSERT_LOCKED()do { int _s = rw_status(&netlock); if ((splassert_ctl >
0) && (_s != 0x0001UL && _s != 0x0002UL)) splassert_fail
(0x0002UL, _s, __func__); } while (0);
855
856 /* Walk the chain backwards to the first tdb */
857 for (; tdbp != NULL((void *)0); tdbp = tdbp->tdb_inext) {
858 if (tdbp->tdb_flags & TDBF_INVALID0x00010 ||
859 (adjust = ipsec_hdrsz(tdbp)) == -1)
860 return;
861
862 mtu -= adjust;
863
864 /* Store adjusted MTU in tdb */
865 tdbp->tdb_mtu = mtu;
866 tdbp->tdb_mtutimeout = gettime() + ip_mtudisc_timeout;
867 DPRINTF("spi %08x mtu %d adjust %ld",do { } while (0)
868 ntohl(tdbp->tdb_spi), tdbp->tdb_mtu, adjust)do { } while (0);
869 }
870}
871
872void
873ipsec_common_ctlinput(u_int rdomain, int cmd, struct sockaddr *sa,
874 void *v, int proto)
875{
876 struct ip *ip = v;
877
878 if (cmd == PRC_MSGSIZE5 && ip && ip_mtudisc && ip->ip_v == 4) {
879 struct tdb *tdbp;
880 struct sockaddr_in dst;
881 struct icmp *icp;
882 int hlen = ip->ip_hl << 2;
883 u_int32_t spi, mtu;
884
885 /* Find the right MTU. */
886 icp = (struct icmp *)((caddr_t) ip -
887 offsetof(struct icmp, icmp_ip)__builtin_offsetof(struct icmp, icmp_dun.id_ip.idi_ip));
888 mtu = ntohs(icp->icmp_nextmtu)(__uint16_t)(__builtin_constant_p(icp->icmp_hun.ih_pmtu.ipm_nextmtu
) ? (__uint16_t)(((__uint16_t)(icp->icmp_hun.ih_pmtu.ipm_nextmtu
) & 0xffU) << 8 | ((__uint16_t)(icp->icmp_hun.ih_pmtu
.ipm_nextmtu) & 0xff00U) >> 8) : __swap16md(icp->
icmp_hun.ih_pmtu.ipm_nextmtu));
889
890 /*
891 * Ignore the packet, if we do not receive a MTU
892 * or the MTU is too small to be acceptable.
893 */
894 if (mtu < 296)
895 return;
896
897 memset(&dst, 0, sizeof(struct sockaddr_in))__builtin_memset((&dst), (0), (sizeof(struct sockaddr_in)
));
898 dst.sin_family = AF_INET2;
899 dst.sin_len = sizeof(struct sockaddr_in);
900 dst.sin_addr.s_addr = ip->ip_dst.s_addr;
901
902 memcpy(&spi, (caddr_t)ip + hlen, sizeof(u_int32_t))__builtin_memcpy((&spi), ((caddr_t)ip + hlen), (sizeof(u_int32_t
)));
903
904 tdbp = gettdb_rev(rdomain, spi, (union sockaddr_union *)&dst,gettdb_dir((rdomain),(spi),((union sockaddr_union *)&dst)
,(proto),1)
905 proto)gettdb_dir((rdomain),(spi),((union sockaddr_union *)&dst)
,(proto),1);
906 ipsec_set_mtu(tdbp, mtu);
907 tdb_unref(tdbp);
908 }
909}
910
911void
912udpencap_ctlinput(int cmd, struct sockaddr *sa, u_int rdomain, void *v)
913{
914 struct ip *ip = v;
915 struct tdb *tdbp, *first;
916 struct icmp *icp;
917 u_int32_t mtu;
918 struct sockaddr_in dst, src;
919 union sockaddr_union *su_dst, *su_src;
920
921 NET_ASSERT_LOCKED()do { int _s = rw_status(&netlock); if ((splassert_ctl >
0) && (_s != 0x0001UL && _s != 0x0002UL)) splassert_fail
(0x0002UL, _s, __func__); } while (0);
922
923 icp = (struct icmp *)((caddr_t) ip - offsetof(struct icmp, icmp_ip)__builtin_offsetof(struct icmp, icmp_dun.id_ip.idi_ip));
924 mtu = ntohs(icp->icmp_nextmtu)(__uint16_t)(__builtin_constant_p(icp->icmp_hun.ih_pmtu.ipm_nextmtu
) ? (__uint16_t)(((__uint16_t)(icp->icmp_hun.ih_pmtu.ipm_nextmtu
) & 0xffU) << 8 | ((__uint16_t)(icp->icmp_hun.ih_pmtu
.ipm_nextmtu) & 0xff00U) >> 8) : __swap16md(icp->
icmp_hun.ih_pmtu.ipm_nextmtu));
925
926 /*
927 * Ignore the packet, if we do not receive a MTU
928 * or the MTU is too small to be acceptable.
929 */
930 if (mtu < 296)
931 return;
932
933 memset(&dst, 0, sizeof(dst))__builtin_memset((&dst), (0), (sizeof(dst)));
934 dst.sin_family = AF_INET2;
935 dst.sin_len = sizeof(struct sockaddr_in);
936 dst.sin_addr.s_addr = ip->ip_dst.s_addr;
937 su_dst = (union sockaddr_union *)&dst;
938 memset(&src, 0, sizeof(src))__builtin_memset((&src), (0), (sizeof(src)));
939 src.sin_family = AF_INET2;
940 src.sin_len = sizeof(struct sockaddr_in);
941 src.sin_addr.s_addr = ip->ip_src.s_addr;
942 su_src = (union sockaddr_union *)&src;
943
944 first = gettdbbysrcdst_rev(rdomain, 0, su_src, su_dst, IPPROTO_ESP)gettdbbysrcdst_dir((rdomain),(0),(su_src),(su_dst),(50),1);
945
946 mtx_enter(&tdb_sadb_mtx);
947 for (tdbp = first; tdbp != NULL((void *)0); tdbp = tdbp->tdb_snext) {
948 if (tdbp->tdb_sproto == IPPROTO_ESP50 &&
949 ((tdbp->tdb_flags & (TDBF_INVALID0x00010|TDBF_UDPENCAP0x20000)) ==
950 TDBF_UDPENCAP0x20000) &&
951 !memcmp(&tdbp->tdb_dst, &dst, su_dst->sa.sa_len)__builtin_memcmp((&tdbp->tdb_dst), (&dst), (su_dst
->sa.sa_len)) &&
952 !memcmp(&tdbp->tdb_src, &src, su_src->sa.sa_len)__builtin_memcmp((&tdbp->tdb_src), (&src), (su_src
->sa.sa_len)))
953 ipsec_set_mtu(tdbp, mtu);
954 }
955 mtx_leave(&tdb_sadb_mtx);
956 tdb_unref(first);
957}
958
959void
960esp4_ctlinput(int cmd, struct sockaddr *sa, u_int rdomain, void *v)
961{
962 if (sa->sa_family != AF_INET2 ||
963 sa->sa_len != sizeof(struct sockaddr_in))
964 return;
965
966 ipsec_common_ctlinput(rdomain, cmd, sa, v, IPPROTO_ESP50);
967}
968
969/* Find the offset of the next protocol field in the previous header. */
970int
971ipsec_protoff(struct mbuf *m, int off, int af)
972{
973#ifdef INET61
974 struct ip6_ext ip6e;
975 int protoff, nxt, l;
976#endif /* INET6 */
977
978 switch (af) {
979 case AF_INET2:
980 return offsetof(struct ip, ip_p)__builtin_offsetof(struct ip, ip_p);
981#ifdef INET61
982 case AF_INET624:
983 break;
984#endif /* INET6 */
985 default:
986 unhandled_af(af);
987 }
988
989#ifdef INET61
990 if (off < sizeof(struct ip6_hdr))
991 return -1;
992
993 if (off == sizeof(struct ip6_hdr))
994 return offsetof(struct ip6_hdr, ip6_nxt)__builtin_offsetof(struct ip6_hdr, ip6_ctlun.ip6_un1.ip6_un1_nxt
);
995
996 /* Chase down the header chain... */
997 protoff = sizeof(struct ip6_hdr);
998 nxt = (mtod(m, struct ip6_hdr *)((struct ip6_hdr *)((m)->m_hdr.mh_data)))->ip6_nxtip6_ctlun.ip6_un1.ip6_un1_nxt;
999 l = 0;
1000
1001 do {
1002 protoff += l;
1003 m_copydata(m, protoff, sizeof(ip6e),
1004 (caddr_t) &ip6e);
1005
1006 if (nxt == IPPROTO_AH51)
1007 l = (ip6e.ip6e_len + 2) << 2;
1008 else
1009 l = (ip6e.ip6e_len + 1) << 3;
1010#ifdef DIAGNOSTIC1
1011 if (l <= 0)
1012 panic("%s: l went zero or negative", __func__);
1013#endif
1014
1015 nxt = ip6e.ip6e_nxt;
1016 } while (protoff + l < off);
1017
1018 /* Malformed packet check */
1019 if (protoff + l != off)
1020 return -1;
1021
1022 protoff += offsetof(struct ip6_ext, ip6e_nxt)__builtin_offsetof(struct ip6_ext, ip6e_nxt);
1023 return protoff;
1024#endif /* INET6 */
1025}
1026
1027int
1028ipsec_forward_check(struct mbuf *m, int hlen, int af)
1029{
1030 struct tdb *tdb;
1031 struct tdb_ident *tdbi;
1032 struct m_tag *mtag;
1033 int error = 0;
1034
1035 /*
1036 * IPsec policy check for forwarded packets. Look at
1037 * inner-most IPsec SA used.
1038 */
1039 mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE0x0001, NULL((void *)0));
1040 if (mtag != NULL((void *)0)) {
1041 tdbi = (struct tdb_ident *)(mtag + 1);
1042 tdb = gettdb(tdbi->rdomain, tdbi->spi, &tdbi->dst, tdbi->proto)gettdb_dir((tdbi->rdomain),(tdbi->spi),(&tdbi->dst
),(tdbi->proto),0);
1043 } else
1044 tdb = NULL((void *)0);
1045 error = ipsp_spd_lookup(m, af, hlen, IPSP_DIRECTION_IN0x1,
1046 tdb, NULL((void *)0), NULL((void *)0), NULL((void *)0));
1047 tdb_unref(tdb);
1048
1049 return error;
1050}
1051
1052int
1053ipsec_local_check(struct mbuf *m, int hlen, int proto, int af)
1054{
1055 struct tdb *tdb;
1056 struct tdb_ident *tdbi;
1057 struct m_tag *mtag;
1058 int error = 0;
1059
1060 /*
1061 * If it's a protected packet for us, skip the policy check.
1062 * That's because we really only care about the properties of
1063 * the protected packet, and not the intermediate versions.
1064 * While this is not the most paranoid setting, it allows
1065 * some flexibility in handling nested tunnels (in setting up
1066 * the policies).
1067 */
1068 if ((proto == IPPROTO_ESP50) || (proto == IPPROTO_AH51) ||
1069 (proto == IPPROTO_IPCOMP108))
1070 return 0;
1071
1072 /*
1073 * If the protected packet was tunneled, then we need to
1074 * verify the protected packet's information, not the
1075 * external headers. Thus, skip the policy lookup for the
1076 * external packet, and keep the IPsec information linked on
1077 * the packet header (the encapsulation routines know how
1078 * to deal with that).
1079 */
1080 if ((proto == IPPROTO_IPV44) || (proto == IPPROTO_IPV641))
1081 return 0;
1082
1083 /*
1084 * When processing IPv6 header chains, do not look at the
1085 * outer header. The inner protocol is relevant and will
1086 * be checked by the local delivery loop later.
1087 */
1088 if ((af == AF_INET624) && ((proto == IPPROTO_DSTOPTS60) ||
1089 (proto == IPPROTO_ROUTING43) || (proto == IPPROTO_FRAGMENT44)))
1090 return 0;
1091
1092 /*
1093 * If the protected packet is TCP or UDP, we'll do the
1094 * policy check in the respective input routine, so we can
1095 * check for bypass sockets.
1096 */
1097 if ((proto == IPPROTO_TCP6) || (proto == IPPROTO_UDP17))
1098 return 0;
1099
1100 /*
1101 * IPsec policy check for local-delivery packets. Look at the
1102 * inner-most SA that protected the packet. This is in fact
1103 * a bit too restrictive (it could end up causing packets to
1104 * be dropped that semantically follow the policy, e.g., in
1105 * certain SA-bundle configurations); but the alternative is
1106 * very complicated (and requires keeping track of what
1107 * kinds of tunneling headers have been seen in-between the
1108 * IPsec headers), and I don't think we lose much functionality
1109 * that's needed in the real world (who uses bundles anyway ?).
1110 */
1111 mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE0x0001, NULL((void *)0));
1112 if (mtag) {
1113 tdbi = (struct tdb_ident *)(mtag + 1);
1114 tdb = gettdb(tdbi->rdomain, tdbi->spi, &tdbi->dst,gettdb_dir((tdbi->rdomain),(tdbi->spi),(&tdbi->dst
),(tdbi->proto),0)
1115 tdbi->proto)gettdb_dir((tdbi->rdomain),(tdbi->spi),(&tdbi->dst
),(tdbi->proto),0);
1116 } else
1117 tdb = NULL((void *)0);
1118 error = ipsp_spd_lookup(m, af, hlen, IPSP_DIRECTION_IN0x1,
1119 tdb, NULL((void *)0), NULL((void *)0), NULL((void *)0));
1120 tdb_unref(tdb);
1121
1122 return error;
1123}