diff options
Diffstat (limited to 'src/netaddress.cpp')
| -rw-r--r-- | src/netaddress.cpp | 151 |
1 files changed, 104 insertions, 47 deletions
diff --git a/src/netaddress.cpp b/src/netaddress.cpp index 2ee4ae3ee3..228caf74a9 100644 --- a/src/netaddress.cpp +++ b/src/netaddress.cpp @@ -6,6 +6,7 @@ #include <netaddress.h> #include <hash.h> #include <util/strencodings.h> +#include <util/asmap.h> #include <tinyformat.h> static const unsigned char pchIPv4[12] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xff, 0xff }; @@ -209,6 +210,11 @@ bool CNetAddr::IsRFC7343() const return (GetByte(15) == 0x20 && GetByte(14) == 0x01 && GetByte(13) == 0x00 && (GetByte(12) & 0xF0) == 0x20); } +bool CNetAddr::IsHeNet() const +{ + return (GetByte(15) == 0x20 && GetByte(14) == 0x01 && GetByte(13) == 0x04 && GetByte(12) == 0x70); +} + /** * @returns Whether or not this is a dummy address that maps an onion address * into IPv6. @@ -400,6 +406,73 @@ bool CNetAddr::GetIn6Addr(struct in6_addr* pipv6Addr) const return true; } +bool CNetAddr::HasLinkedIPv4() const +{ + return IsRoutable() && (IsIPv4() || IsRFC6145() || IsRFC6052() || IsRFC3964() || IsRFC4380()); +} + +uint32_t CNetAddr::GetLinkedIPv4() const +{ + if (IsIPv4() || IsRFC6145() || IsRFC6052()) { + // IPv4, mapped IPv4, SIIT translated IPv4: the IPv4 address is the last 4 bytes of the address + return ReadBE32(ip + 12); + } else if (IsRFC3964()) { + // 6to4 tunneled IPv4: the IPv4 address is in bytes 2-6 + return ReadBE32(ip + 2); + } else if (IsRFC4380()) { + // Teredo tunneled IPv4: the IPv4 address is in the last 4 bytes of the address, but bitflipped + return ~ReadBE32(ip + 12); + } + assert(false); +} + +uint32_t CNetAddr::GetNetClass() const { + uint32_t net_class = NET_IPV6; + if (IsLocal()) { + net_class = 255; + } + if (IsInternal()) { + net_class = NET_INTERNAL; + } else if (!IsRoutable()) { + net_class = NET_UNROUTABLE; + } else if (HasLinkedIPv4()) { + net_class = NET_IPV4; + } else if (IsTor()) { + net_class = NET_ONION; + } + return net_class; +} + +uint32_t CNetAddr::GetMappedAS(const std::vector<bool> &asmap) const { + uint32_t net_class = GetNetClass(); + if (asmap.size() == 0 || (net_class != NET_IPV4 && net_class != NET_IPV6)) { + return 0; // Indicates not found, safe because AS0 is reserved per RFC7607. + } + std::vector<bool> ip_bits(128); + if (HasLinkedIPv4()) { + // For lookup, treat as if it was just an IPv4 address (pchIPv4 prefix + IPv4 bits) + for (int8_t byte_i = 0; byte_i < 12; ++byte_i) { + for (uint8_t bit_i = 0; bit_i < 8; ++bit_i) { + ip_bits[byte_i * 8 + bit_i] = (pchIPv4[byte_i] >> (7 - bit_i)) & 1; + } + } + uint32_t ipv4 = GetLinkedIPv4(); + for (int i = 0; i < 32; ++i) { + ip_bits[96 + i] = (ipv4 >> (31 - i)) & 1; + } + } else { + // Use all 128 bits of the IPv6 address otherwise + for (int8_t byte_i = 0; byte_i < 16; ++byte_i) { + uint8_t cur_byte = GetByte(15 - byte_i); + for (uint8_t bit_i = 0; bit_i < 8; ++bit_i) { + ip_bits[byte_i * 8 + bit_i] = (cur_byte >> (7 - bit_i)) & 1; + } + } + } + uint32_t mapped_as = Interpret(asmap, ip_bits); + return mapped_as; +} + /** * Get the canonical identifier of our network group * @@ -410,67 +483,51 @@ bool CNetAddr::GetIn6Addr(struct in6_addr* pipv6Addr) const * @note No two connections will be attempted to addresses with the same network * group. */ -std::vector<unsigned char> CNetAddr::GetGroup() const +std::vector<unsigned char> CNetAddr::GetGroup(const std::vector<bool> &asmap) const { std::vector<unsigned char> vchRet; - int nClass = NET_IPV6; + uint32_t net_class = GetNetClass(); + // If non-empty asmap is supplied and the address is IPv4/IPv6, + // return ASN to be used for bucketing. + uint32_t asn = GetMappedAS(asmap); + if (asn != 0) { // Either asmap was empty, or address has non-asmappable net class (e.g. TOR). + vchRet.push_back(NET_IPV6); // IPv4 and IPv6 with same ASN should be in the same bucket + for (int i = 0; i < 4; i++) { + vchRet.push_back((asn >> (8 * i)) & 0xFF); + } + return vchRet; + } + + vchRet.push_back(net_class); int nStartByte = 0; int nBits = 16; - // all local addresses belong to the same group - if (IsLocal()) - { - nClass = 255; + if (IsLocal()) { + // all local addresses belong to the same group nBits = 0; - } - // all internal-usage addresses get their own group - if (IsInternal()) - { - nClass = NET_INTERNAL; + } else if (IsInternal()) { + // all internal-usage addresses get their own group nStartByte = sizeof(g_internal_prefix); nBits = (sizeof(ip) - sizeof(g_internal_prefix)) * 8; - } - // all other unroutable addresses belong to the same group - else if (!IsRoutable()) - { - nClass = NET_UNROUTABLE; + } else if (!IsRoutable()) { + // all other unroutable addresses belong to the same group nBits = 0; - } - // for IPv4 addresses, '1' + the 16 higher-order bits of the IP - // includes mapped IPv4, SIIT translated IPv4, and the well-known prefix - else if (IsIPv4() || IsRFC6145() || IsRFC6052()) - { - nClass = NET_IPV4; - nStartByte = 12; - } - // for 6to4 tunnelled addresses, use the encapsulated IPv4 address - else if (IsRFC3964()) - { - nClass = NET_IPV4; - nStartByte = 2; - } - // for Teredo-tunnelled IPv6 addresses, use the encapsulated IPv4 address - else if (IsRFC4380()) - { - vchRet.push_back(NET_IPV4); - vchRet.push_back(GetByte(3) ^ 0xFF); - vchRet.push_back(GetByte(2) ^ 0xFF); + } else if (HasLinkedIPv4()) { + // IPv4 addresses (and mapped IPv4 addresses) use /16 groups + uint32_t ipv4 = GetLinkedIPv4(); + vchRet.push_back((ipv4 >> 24) & 0xFF); + vchRet.push_back((ipv4 >> 16) & 0xFF); return vchRet; - } - else if (IsTor()) - { - nClass = NET_ONION; + } else if (IsTor()) { nStartByte = 6; nBits = 4; - } - // for he.net, use /36 groups - else if (GetByte(15) == 0x20 && GetByte(14) == 0x01 && GetByte(13) == 0x04 && GetByte(12) == 0x70) + } else if (IsHeNet()) { + // for he.net, use /36 groups nBits = 36; - // for the rest of the IPv6 network, use /32 groups - else + } else { + // for the rest of the IPv6 network, use /32 groups nBits = 32; - - vchRet.push_back(nClass); + } // push our ip onto vchRet byte by byte... while (nBits >= 8) |