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git.ipfire.org Git - thirdparty/squid.git/blob - src/ip/tools.cc
2 * Copyright (C) 1996-2023 The Squid Software Foundation and contributors
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.
9 /* DEBUG: section 21 Misc Functions */
12 #include "debug/Messages.h"
13 #include "ip/Address.h"
20 #include <sys/socket.h>
23 #include <netinet/in.h>
25 #if HAVE_NETINET_IN6_H
26 #include <netinet/in6.h>
29 int Ip::EnableIpv6
= IPV6_OFF
;
34 // check for usable IPv6 sockets
35 int s
= socket(PF_INET6
, SOCK_STREAM
, 0);
37 debugs(3, 2, "IPv6 not supported on this machine. Auto-Disabled.");
38 EnableIpv6
= IPV6_OFF
;
42 // Test for v4-mapping capability
43 // (AKA. the operating system supports RFC 3493 section 5.3)
44 #if defined(IPV6_V6ONLY)
46 if (setsockopt(s
, IPPROTO_IPV6
, IPV6_V6ONLY
, (char *) &tos
, sizeof(int)) == 0) {
47 debugs(3, 2, "Detected IPv6 hybrid or v4-mapping stack...");
48 EnableIpv6
|= IPV6_SPECIAL_V4MAPPING
;
50 debugs(3, 2, "Detected split IPv4 and IPv6 stacks ...");
51 EnableIpv6
|= IPV6_SPECIAL_SPLITSTACK
;
54 // compliance here means they at least supply the option for compilers building code
55 // even if possibly to return hard-coded -1 on use.
56 debugs(3, 2, "Missing RFC 3493 compliance - attempting split IPv4 and IPv6 stacks ...");
57 EnableIpv6
|= IPV6_SPECIAL_SPLITSTACK
;
60 // Test for IPv6 loopback/localhost address binding
63 if (ip
.isIPv6()) { // paranoid; always succeeds if we got this far
64 struct sockaddr_in6 sin
;
66 if (bind(s
, reinterpret_cast<struct sockaddr
*>(&sin
), sizeof(sin
)) != 0) {
67 debugs(3, Critical(66), "WARNING: BCP 177 violation. Detected non-functional IPv6 loopback.");
68 EnableIpv6
= IPV6_OFF
;
70 debugs(3, 2, "Detected functional IPv6 loopback ...");
77 debugs(3, 2, "IPv6 transport " << (EnableIpv6
?"Enabled":"Disabled"));
79 debugs(3, 2, "IPv6 transport " << (EnableIpv6
?"Available":"Disabled"));
80 if (EnableIpv6
!= IPV6_OFF
) {
81 debugs(3, Critical(67), "WARNING: BCP 177 violation. IPv6 transport forced OFF by build parameters.");
82 EnableIpv6
= IPV6_OFF
;