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Commit | Line | Data |
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c8be6d7b | 1 | /* |
bde978a6 | 2 | * Copyright (C) 1996-2015 The Squid Software Foundation and contributors |
c8be6d7b | 3 | * |
bbc27441 AJ |
4 | * Squid software is distributed under GPLv2+ license and includes |
5 | * contributions from numerous individuals and organizations. | |
6 | * Please see the COPYING and CONTRIBUTORS files for details. | |
c8be6d7b | 7 | */ |
bbc27441 AJ |
8 | |
9 | /* DEBUG: section 89 NAT / IP Interception */ | |
10 | ||
d25bbe26 AJ |
11 | // Enable hack to workaround Solaris 10 IPFilter breakage |
12 | #define BUILDING_SQUID_IP_INTERCEPT_CC 1 | |
13 | ||
f7f3304a | 14 | #include "squid.h" |
40d34a62 | 15 | #include "comm/Connection.h" |
b3166404 | 16 | #include "fde.h" |
602d9612 | 17 | #include "ip/Intercept.h" |
5c1be108 | 18 | #include "src/tools.h" |
fc27cd70 | 19 | |
1a30fdf5 AJ |
20 | #include <cerrno> |
21 | ||
c8be6d7b | 22 | #if IPF_TRANSPARENT |
34ec5c62 | 23 | |
d25bbe26 AJ |
24 | #if !defined(IPFILTER_VERSION) |
25 | #define IPFILTER_VERSION 5000004 | |
26 | #endif | |
27 | ||
28 | #if HAVE_SYS_IOCCOM_H | |
29 | #include <sys/ioccom.h> | |
30 | #endif | |
c8be6d7b | 31 | #if HAVE_SYS_IOCTL_H |
32 | #include <sys/ioctl.h> | |
33 | #endif | |
d25bbe26 AJ |
34 | #if HAVE_NETINET_IP6_H |
35 | #include <netinet/ip6.h> | |
36 | #endif | |
e9e7c285 | 37 | #if HAVE_NETINET_TCP_H |
c8be6d7b | 38 | #include <netinet/tcp.h> |
e9e7c285 | 39 | #endif |
40 | #if HAVE_NET_IF_H | |
c8be6d7b | 41 | #include <net/if.h> |
e9e7c285 | 42 | #endif |
b0dfd10b | 43 | #if HAVE_IPL_H |
dbc5782a | 44 | #include <ipl.h> |
45 | #elif HAVE_NETINET_IPL_H | |
46 | #include <netinet/ipl.h> | |
47 | #endif | |
d25bbe26 AJ |
48 | #if USE_SOLARIS_IPFILTER_MINOR_T_HACK |
49 | #undef minor_t | |
50 | #endif | |
c8be6d7b | 51 | #if HAVE_IP_FIL_COMPAT_H |
52 | #include <ip_fil_compat.h> | |
53 | #elif HAVE_NETINET_IP_FIL_COMPAT_H | |
54 | #include <netinet/ip_fil_compat.h> | |
55 | #elif HAVE_IP_COMPAT_H | |
56 | #include <ip_compat.h> | |
57 | #elif HAVE_NETINET_IP_COMPAT_H | |
58 | #include <netinet/ip_compat.h> | |
59 | #endif | |
60 | #if HAVE_IP_FIL_H | |
61 | #include <ip_fil.h> | |
62 | #elif HAVE_NETINET_IP_FIL_H | |
63 | #include <netinet/ip_fil.h> | |
64 | #endif | |
65 | #if HAVE_IP_NAT_H | |
66 | #include <ip_nat.h> | |
67 | #elif HAVE_NETINET_IP_NAT_H | |
68 | #include <netinet/ip_nat.h> | |
69 | #endif | |
34ec5c62 AJ |
70 | |
71 | #endif /* IPF_TRANSPARENT required headers */ | |
c8be6d7b | 72 | |
73 | #if PF_TRANSPARENT | |
c8be6d7b | 74 | #include <sys/socket.h> |
75 | #include <sys/ioctl.h> | |
76 | #include <sys/fcntl.h> | |
77 | #include <net/if.h> | |
78 | #include <netinet/in.h> | |
b0dfd10b | 79 | #if HAVE_NET_PF_PFVAR_H |
ec9909b0 AJ |
80 | #include <net/pf/pfvar.h> |
81 | #endif /* HAVE_NET_PF_PFVAR_H */ | |
b0dfd10b | 82 | #if HAVE_NET_PFVAR_H |
c8be6d7b | 83 | #include <net/pfvar.h> |
ec9909b0 | 84 | #endif /* HAVE_NET_PFVAR_H */ |
34ec5c62 | 85 | #endif /* PF_TRANSPARENT required headers */ |
5afac208 AJ |
86 | |
87 | #if LINUX_NETFILTER | |
074d6a40 AJ |
88 | /* <climits> must be before including netfilter_ipv4.h */ |
89 | #include <climits> | |
ee80a919 | 90 | #include <linux/if.h> |
c8be6d7b | 91 | #include <linux/netfilter_ipv4.h> |
ee80a919 AR |
92 | #if HAVE_LINUX_NETFILTER_IPV6_IP6_TABLES_H |
93 | /* 2013-07-01: Pablo the Netfilter maintainer is rejecting patches | |
94 | * which will enable C++ compilers to build the Netfilter public headers. | |
95 | * We can auto-detect its presence and attempt to use in case he ever | |
96 | * changes his mind or things get cleaned up some other way. | |
97 | * But until then are usually forced to hard-code the getsockopt() code | |
98 | * for IPv6 NAT lookups. | |
99 | */ | |
100 | #include <linux/netfilter_ipv6/ip6_tables.h> | |
101 | #endif | |
102 | #if !defined(IP6T_SO_ORIGINAL_DST) | |
f53969cc | 103 | #define IP6T_SO_ORIGINAL_DST 80 // stolen with prejudice from the above file. |
ee80a919 | 104 | #endif |
5afac208 | 105 | #endif /* LINUX_NETFILTER required headers */ |
c8be6d7b | 106 | |
0fc2952e | 107 | // single global instance for access by other components. |
b7ac5457 | 108 | Ip::Intercept Ip::Interceptor; |
0fc2952e | 109 | |
04f87469 | 110 | void |
b7ac5457 | 111 | Ip::Intercept::StopTransparency(const char *str) |
26ac0430 | 112 | { |
40d34a62 | 113 | if (transparentActive_) { |
788625af | 114 | debugs(89, DBG_IMPORTANT, "Stopping full transparency: " << str); |
40d34a62 | 115 | transparentActive_ = 0; |
788625af | 116 | } |
04f87469 AJ |
117 | } |
118 | ||
119 | void | |
b7ac5457 | 120 | Ip::Intercept::StopInterception(const char *str) |
26ac0430 | 121 | { |
40d34a62 | 122 | if (interceptActive_) { |
788625af | 123 | debugs(89, DBG_IMPORTANT, "Stopping IP interception: " << str); |
40d34a62 | 124 | interceptActive_ = 0; |
788625af | 125 | } |
04f87469 | 126 | } |
0fc2952e | 127 | |
40d34a62 AJ |
128 | bool |
129 | Ip::Intercept::NetfilterInterception(const Comm::ConnectionPointer &newConn, int silent) | |
7b0a0d1f AJ |
130 | { |
131 | #if LINUX_NETFILTER | |
ee80a919 AR |
132 | struct sockaddr_storage lookup; |
133 | socklen_t len = newConn->local.isIPv6() ? sizeof(sockaddr_in6) : sizeof(sockaddr_in); | |
134 | newConn->local.getSockAddr(lookup, AF_UNSPEC); | |
7b0a0d1f AJ |
135 | |
136 | /** \par | |
137 | * Try NAT lookup for REDIRECT or DNAT targets. */ | |
ee80a919 | 138 | if ( getsockopt(newConn->fd, |
fa0b1a25 A |
139 | newConn->local.isIPv6() ? IPPROTO_IPV6 : IPPROTO_IP, |
140 | newConn->local.isIPv6() ? IP6T_SO_ORIGINAL_DST : SO_ORIGINAL_DST, | |
141 | &lookup, | |
142 | &len) != 0) { | |
26ac0430 | 143 | if (!silent) { |
ee80a919 | 144 | debugs(89, DBG_IMPORTANT, "ERROR: NF getsockopt(ORIGINAL_DST) failed on " << newConn << ": " << xstrerror()); |
40d34a62 | 145 | lastReported_ = squid_curtime; |
7b0a0d1f | 146 | } |
ee80a919 | 147 | debugs(89, 9, "address: " << newConn); |
40d34a62 | 148 | return false; |
26ac0430 | 149 | } else { |
40d34a62 | 150 | newConn->local = lookup; |
ee80a919 | 151 | debugs(89, 5, "address NAT: " << newConn); |
40d34a62 | 152 | return true; |
7b0a0d1f | 153 | } |
7b0a0d1f | 154 | #endif |
40d34a62 | 155 | return false; |
7b0a0d1f AJ |
156 | } |
157 | ||
40d34a62 | 158 | bool |
ced8def3 | 159 | Ip::Intercept::TproxyTransparent(const Comm::ConnectionPointer &newConn, int) |
7b0a0d1f | 160 | { |
b2192042 AJ |
161 | #if (LINUX_NETFILTER && defined(IP_TRANSPARENT)) || \ |
162 | (PF_TRANSPARENT && defined(SO_BINDANY)) || \ | |
163 | (IPFW_TRANSPARENT && defined(IP_BINDANY)) | |
164 | ||
acaa7194 AJ |
165 | /* Trust the user configured properly. If not no harm done. |
166 | * We will simply attempt a bind outgoing on our own IP. | |
acaa7194 | 167 | */ |
4dd643d5 | 168 | newConn->remote.port(0); // allow random outgoing port to prevent address clashes |
40d34a62 AJ |
169 | debugs(89, 5, HERE << "address TPROXY: " << newConn); |
170 | return true; | |
171 | #else | |
172 | return false; | |
acaa7194 | 173 | #endif |
7b0a0d1f AJ |
174 | } |
175 | ||
40d34a62 | 176 | bool |
ced8def3 | 177 | Ip::Intercept::IpfwInterception(const Comm::ConnectionPointer &newConn, int) |
d8b5bcbc AJ |
178 | { |
179 | #if IPFW_TRANSPARENT | |
b2192042 AJ |
180 | /* The getsockname() call performed already provided the TCP packet details. |
181 | * There is no way to identify whether they came from NAT or not. | |
182 | * Trust the user configured properly. | |
183 | */ | |
184 | debugs(89, 5, HERE << "address NAT: " << newConn); | |
185 | return true; | |
186 | #else | |
40d34a62 | 187 | return false; |
b2192042 | 188 | #endif |
d8b5bcbc | 189 | } |
0fc2952e | 190 | |
40d34a62 AJ |
191 | bool |
192 | Ip::Intercept::IpfInterception(const Comm::ConnectionPointer &newConn, int silent) | |
3f38a55e | 193 | { |
f1e0717c | 194 | #if IPF_TRANSPARENT /* --enable-ipf-transparent */ |
62e76326 | 195 | |
c8be6d7b | 196 | struct natlookup natLookup; |
197 | static int natfd = -1; | |
c8be6d7b | 198 | int x; |
3f38a55e | 199 | |
c74be4ce | 200 | // all fields must be set to 0 |
dcfb239f | 201 | memset(&natLookup, 0, sizeof(natLookup)); |
c74be4ce | 202 | // for NAT lookup set local and remote IP:port's |
4dd643d5 AJ |
203 | natLookup.nl_inport = htons(newConn->local.port()); |
204 | newConn->local.getInAddr(natLookup.nl_inip); | |
205 | natLookup.nl_outport = htons(newConn->remote.port()); | |
206 | newConn->remote.getInAddr(natLookup.nl_outip); | |
c74be4ce | 207 | // ... and the TCP flag |
c8be6d7b | 208 | natLookup.nl_flags = IPN_TCP; |
62e76326 | 209 | |
26ac0430 | 210 | if (natfd < 0) { |
62e76326 | 211 | int save_errno; |
212 | enter_suid(); | |
dbc5782a | 213 | #ifdef IPNAT_NAME |
dbc5782a | 214 | natfd = open(IPNAT_NAME, O_RDONLY, 0); |
98a3bc99 | 215 | #else |
62e76326 | 216 | natfd = open(IPL_NAT, O_RDONLY, 0); |
98a3bc99 | 217 | #endif |
62e76326 | 218 | save_errno = errno; |
219 | leave_suid(); | |
220 | errno = save_errno; | |
c8be6d7b | 221 | } |
62e76326 | 222 | |
26ac0430 | 223 | if (natfd < 0) { |
219f8edb | 224 | if (!silent) { |
c74be4ce | 225 | debugs(89, DBG_IMPORTANT, "IPF (IPFilter) NAT open failed: " << xstrerror()); |
40d34a62 AJ |
226 | lastReported_ = squid_curtime; |
227 | return false; | |
d6026916 | 228 | } |
c8be6d7b | 229 | } |
62e76326 | 230 | |
dbc5782a | 231 | #if defined(IPFILTER_VERSION) && (IPFILTER_VERSION >= 4000027) |
c74be4ce AJ |
232 | struct ipfobj obj; |
233 | memset(&obj, 0, sizeof(obj)); | |
234 | obj.ipfo_rev = IPFILTER_VERSION; | |
235 | obj.ipfo_size = sizeof(natLookup); | |
236 | obj.ipfo_ptr = &natLookup; | |
237 | obj.ipfo_type = IPFOBJ_NATLOOKUP; | |
238 | ||
dbc5782a | 239 | x = ioctl(natfd, SIOCGNATL, &obj); |
dbc5782a | 240 | #else |
3f38a55e | 241 | /* |
dbc5782a | 242 | * IP-Filter changed the type for SIOCGNATL between |
243 | * 3.3 and 3.4. It also changed the cmd value for | |
244 | * SIOCGNATL, so at least we can detect it. We could | |
245 | * put something in configure and use ifdefs here, but | |
246 | * this seems simpler. | |
247 | */ | |
c74be4ce | 248 | static int siocgnatl_cmd = SIOCGNATL & 0xff; |
26ac0430 | 249 | if (63 == siocgnatl_cmd) { |
62e76326 | 250 | struct natlookup *nlp = &natLookup; |
251 | x = ioctl(natfd, SIOCGNATL, &nlp); | |
26ac0430 | 252 | } else { |
62e76326 | 253 | x = ioctl(natfd, SIOCGNATL, &natLookup); |
254 | } | |
255 | ||
dbc5782a | 256 | #endif |
26ac0430 | 257 | if (x < 0) { |
62e76326 | 258 | if (errno != ESRCH) { |
219f8edb | 259 | if (!silent) { |
c74be4ce | 260 | debugs(89, DBG_IMPORTANT, "IPF (IPFilter) NAT lookup failed: ioctl(SIOCGNATL) (v=" << IPFILTER_VERSION << "): " << xstrerror()); |
40d34a62 | 261 | lastReported_ = squid_curtime; |
d6026916 | 262 | } |
263 | ||
62e76326 | 264 | close(natfd); |
265 | natfd = -1; | |
266 | } | |
267 | ||
40d34a62 AJ |
268 | debugs(89, 9, HERE << "address: " << newConn); |
269 | return false; | |
26ac0430 | 270 | } else { |
40d34a62 | 271 | newConn->local = natLookup.nl_realip; |
4dd643d5 | 272 | newConn->local.port(ntohs(natLookup.nl_realport)); |
40d34a62 AJ |
273 | debugs(89, 5, HERE << "address NAT: " << newConn); |
274 | return true; | |
c8be6d7b | 275 | } |
62e76326 | 276 | |
219f8edb | 277 | #endif /* --enable-ipf-transparent */ |
40d34a62 | 278 | return false; |
219f8edb | 279 | } |
f1e0717c | 280 | |
1125ea7b | 281 | bool |
b2192042 | 282 | Ip::Intercept::PfInterception(const Comm::ConnectionPointer &newConn, int silent) |
1125ea7b | 283 | { |
b2192042 AJ |
284 | #if PF_TRANSPARENT /* --enable-pf-transparent */ |
285 | ||
286 | #if !USE_NAT_DEVPF | |
287 | /* On recent PF versions the getsockname() call performed already provided | |
288 | * the required TCP packet details. | |
289 | * There is no way to identify whether they came from NAT or not. | |
290 | * | |
291 | * Trust the user configured properly. | |
1125ea7b | 292 | */ |
b2192042 | 293 | debugs(89, 5, HERE << "address NAT divert-to: " << newConn); |
1125ea7b | 294 | return true; |
1125ea7b | 295 | |
b2192042 | 296 | #else /* USE_NAT_DEVPF / --with-nat-devpf */ |
62e76326 | 297 | |
3f38a55e | 298 | struct pfioc_natlook nl; |
299 | static int pffd = -1; | |
62e76326 | 300 | |
301 | if (pffd < 0) | |
d14c6ef2 | 302 | pffd = open("/dev/pf", O_RDONLY); |
62e76326 | 303 | |
26ac0430 | 304 | if (pffd < 0) { |
51f4d36b | 305 | if (!silent) { |
e9172f79 | 306 | debugs(89, DBG_IMPORTANT, HERE << "PF open failed: " << xstrerror()); |
40d34a62 | 307 | lastReported_ = squid_curtime; |
d6026916 | 308 | } |
40d34a62 | 309 | return false; |
c8be6d7b | 310 | } |
62e76326 | 311 | |
c8be6d7b | 312 | memset(&nl, 0, sizeof(struct pfioc_natlook)); |
4dd643d5 AJ |
313 | newConn->remote.getInAddr(nl.saddr.v4); |
314 | nl.sport = htons(newConn->remote.port()); | |
cc192b50 | 315 | |
4dd643d5 AJ |
316 | newConn->local.getInAddr(nl.daddr.v4); |
317 | nl.dport = htons(newConn->local.port()); | |
cc192b50 | 318 | |
c8be6d7b | 319 | nl.af = AF_INET; |
320 | nl.proto = IPPROTO_TCP; | |
321 | nl.direction = PF_OUT; | |
62e76326 | 322 | |
26ac0430 | 323 | if (ioctl(pffd, DIOCNATLOOK, &nl)) { |
62e76326 | 324 | if (errno != ENOENT) { |
51f4d36b | 325 | if (!silent) { |
e9172f79 | 326 | debugs(89, DBG_IMPORTANT, HERE << "PF lookup failed: ioctl(DIOCNATLOOK)"); |
40d34a62 | 327 | lastReported_ = squid_curtime; |
d6026916 | 328 | } |
62e76326 | 329 | close(pffd); |
330 | pffd = -1; | |
331 | } | |
40d34a62 AJ |
332 | debugs(89, 9, HERE << "address: " << newConn); |
333 | return false; | |
26ac0430 | 334 | } else { |
40d34a62 | 335 | newConn->local = nl.rdaddr.v4; |
4dd643d5 | 336 | newConn->local.port(ntohs(nl.rdport)); |
40d34a62 AJ |
337 | debugs(89, 5, HERE << "address NAT: " << newConn); |
338 | return true; | |
3f38a55e | 339 | } |
b2192042 | 340 | #endif /* --with-nat-devpf */ |
51f4d36b | 341 | #endif /* --enable-pf-transparent */ |
40d34a62 | 342 | return false; |
51f4d36b AJ |
343 | } |
344 | ||
40d34a62 AJ |
345 | bool |
346 | Ip::Intercept::Lookup(const Comm::ConnectionPointer &newConn, const Comm::ConnectionPointer &listenConn) | |
51f4d36b | 347 | { |
af6a12ee AJ |
348 | /* --enable-linux-netfilter */ |
349 | /* --enable-ipfw-transparent */ | |
350 | /* --enable-ipf-transparent */ | |
351 | /* --enable-pf-transparent */ | |
51f4d36b AJ |
352 | #if IPF_TRANSPARENT || LINUX_NETFILTER || IPFW_TRANSPARENT || PF_TRANSPARENT |
353 | ||
51f4d36b AJ |
354 | #if 0 |
355 | // Crop interception errors down to one per minute. | |
40d34a62 | 356 | int silent = (squid_curtime - lastReported_ > 60 ? 0 : 1); |
51f4d36b AJ |
357 | #else |
358 | // Show all interception errors. | |
359 | int silent = 0; | |
360 | #endif | |
361 | ||
40d34a62 AJ |
362 | debugs(89, 5, HERE << "address BEGIN: me/client= " << newConn->local << ", destination/me= " << newConn->remote); |
363 | ||
364 | newConn->flags |= (listenConn->flags & (COMM_TRANSPARENT|COMM_INTERCEPTION)); | |
e9172f79 | 365 | |
9bad3e09 | 366 | /* NP: try TPROXY first, its much quieter than NAT when non-matching */ |
40d34a62 | 367 | if (transparentActive_ && listenConn->flags&COMM_TRANSPARENT) { |
b2192042 | 368 | if (TproxyTransparent(newConn, silent)) return true; |
9bad3e09 AJ |
369 | } |
370 | ||
40d34a62 | 371 | if (interceptActive_ && listenConn->flags&COMM_INTERCEPTION) { |
e9172f79 | 372 | /* NAT methods that use sock-opts to return client address */ |
40d34a62 AJ |
373 | if (NetfilterInterception(newConn, silent)) return true; |
374 | if (IpfwInterception(newConn, silent)) return true; | |
e9172f79 AJ |
375 | |
376 | /* NAT methods that use ioctl to return client address AND destination address */ | |
40d34a62 AJ |
377 | if (PfInterception(newConn, silent)) return true; |
378 | if (IpfInterception(newConn, silent)) return true; | |
51f4d36b | 379 | } |
f1e0717c | 380 | |
51f4d36b | 381 | #else /* none of the transparent options configured */ |
e9172f79 | 382 | debugs(89, DBG_IMPORTANT, "WARNING: transparent proxying not supported"); |
3f38a55e | 383 | #endif |
384 | ||
40d34a62 | 385 | return false; |
f1e0717c | 386 | } |
34ec5c62 | 387 | |
263f84f0 | 388 | bool |
b7ac5457 | 389 | Ip::Intercept::ProbeForTproxy(Ip::Address &test) |
263f84f0 | 390 | { |
b2192042 AJ |
391 | bool doneSuid = false; |
392 | ||
393 | #if _SQUID_LINUX_ && defined(IP_TRANSPARENT) // Linux | |
394 | # define soLevel SOL_IP | |
395 | # define soFlag IP_TRANSPARENT | |
396 | ||
397 | #elif defined(SO_BINDANY) // OpenBSD 4.7+ and NetBSD with PF | |
398 | # define soLevel SOL_SOCKET | |
399 | # define soFlag SO_BINDANY | |
400 | enter_suid(); | |
401 | doneSuid = true; | |
402 | ||
403 | #elif defined(IP_BINDANY) // FreeBSD with IPFW | |
404 | # define soLevel IPPROTO_IP | |
405 | # define soFlag IP_BINDANY | |
406 | enter_suid(); | |
407 | doneSuid = true; | |
408 | ||
409 | #endif | |
410 | ||
411 | #if defined(soLevel) && defined(soFlag) | |
412 | ||
1125ea7b | 413 | debugs(3, 3, "Detect TPROXY support on port " << test); |
263f84f0 AJ |
414 | |
415 | int tos = 1; | |
416 | int tmp_sock = -1; | |
417 | ||
263f84f0 | 418 | /* Probe to see if the Kernel TPROXY support is IPv6-enabled */ |
4dd643d5 | 419 | if (test.isIPv6()) { |
263f84f0 AJ |
420 | debugs(3, 3, "...Probing for IPv6 TPROXY support."); |
421 | ||
422 | struct sockaddr_in6 tmp_ip6; | |
b7ac5457 | 423 | Ip::Address tmp = "::2"; |
4dd643d5 AJ |
424 | tmp.port(0); |
425 | tmp.getSockAddr(tmp_ip6); | |
263f84f0 AJ |
426 | |
427 | if ( (tmp_sock = socket(PF_INET6, SOCK_STREAM, IPPROTO_TCP)) >= 0 && | |
b2192042 | 428 | setsockopt(tmp_sock, soLevel, soFlag, (char *)&tos, sizeof(int)) == 0 && |
f54f527e | 429 | bind(tmp_sock, (struct sockaddr*)&tmp_ip6, sizeof(struct sockaddr_in6)) == 0 ) { |
263f84f0 AJ |
430 | |
431 | debugs(3, 3, "IPv6 TPROXY support detected. Using."); | |
fb5bffa3 | 432 | close(tmp_sock); |
b2192042 AJ |
433 | if (doneSuid) |
434 | leave_suid(); | |
263f84f0 AJ |
435 | return true; |
436 | } | |
437 | if (tmp_sock >= 0) { | |
fb5bffa3 | 438 | close(tmp_sock); |
263f84f0 AJ |
439 | tmp_sock = -1; |
440 | } | |
441 | } | |
442 | ||
4dd643d5 | 443 | if ( test.isIPv6() && !test.setIPv4() ) { |
263f84f0 | 444 | debugs(3, DBG_CRITICAL, "TPROXY lacks IPv6 support for " << test ); |
b2192042 AJ |
445 | if (doneSuid) |
446 | leave_suid(); | |
263f84f0 AJ |
447 | return false; |
448 | } | |
263f84f0 AJ |
449 | |
450 | /* Probe to see if the Kernel TPROXY support is IPv4-enabled (aka present) */ | |
4dd643d5 | 451 | if (test.isIPv4()) { |
263f84f0 AJ |
452 | debugs(3, 3, "...Probing for IPv4 TPROXY support."); |
453 | ||
454 | struct sockaddr_in tmp_ip4; | |
b7ac5457 | 455 | Ip::Address tmp = "127.0.0.2"; |
4dd643d5 AJ |
456 | tmp.port(0); |
457 | tmp.getSockAddr(tmp_ip4); | |
263f84f0 AJ |
458 | |
459 | if ( (tmp_sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP)) >= 0 && | |
b2192042 | 460 | setsockopt(tmp_sock, soLevel, soFlag, (char *)&tos, sizeof(int)) == 0 && |
f54f527e | 461 | bind(tmp_sock, (struct sockaddr*)&tmp_ip4, sizeof(struct sockaddr_in)) == 0 ) { |
263f84f0 AJ |
462 | |
463 | debugs(3, 3, "IPv4 TPROXY support detected. Using."); | |
fb5bffa3 | 464 | close(tmp_sock); |
b2192042 AJ |
465 | if (doneSuid) |
466 | leave_suid(); | |
263f84f0 AJ |
467 | return true; |
468 | } | |
469 | if (tmp_sock >= 0) { | |
fb5bffa3 | 470 | close(tmp_sock); |
263f84f0 AJ |
471 | } |
472 | } | |
473 | ||
1125ea7b MM |
474 | #else |
475 | debugs(3, 3, "TPROXY setsockopt() not supported on this platform. Disabling TPROXY."); | |
476 | ||
263f84f0 | 477 | #endif |
b2192042 AJ |
478 | if (doneSuid) |
479 | leave_suid(); | |
263f84f0 AJ |
480 | return false; |
481 | } | |
f53969cc | 482 |